10e8cc8bdSWilliam Juul /*
20e8cc8bdSWilliam Juul * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
30e8cc8bdSWilliam Juul *
4753ac610SCharles Manning * Copyright (C) 2002-2011 Aleph One Ltd.
50e8cc8bdSWilliam Juul * for Toby Churchill Ltd and Brightstar Engineering
60e8cc8bdSWilliam Juul *
70e8cc8bdSWilliam Juul * Created by Charles Manning <charles@aleph1.co.uk>
80e8cc8bdSWilliam Juul *
90e8cc8bdSWilliam Juul * This program is free software; you can redistribute it and/or modify
100e8cc8bdSWilliam Juul * it under the terms of the GNU General Public License version 2 as
110e8cc8bdSWilliam Juul * published by the Free Software Foundation.
120e8cc8bdSWilliam Juul */
130e8cc8bdSWilliam Juul
140e8cc8bdSWilliam Juul #include "yportenv.h"
15753ac610SCharles Manning #include "yaffs_trace.h"
160e8cc8bdSWilliam Juul
170e8cc8bdSWilliam Juul #include "yaffs_guts.h"
18753ac610SCharles Manning #include "yaffs_getblockinfo.h"
190e8cc8bdSWilliam Juul #include "yaffs_tagscompat.h"
200e8cc8bdSWilliam Juul #include "yaffs_nand.h"
21753ac610SCharles Manning #include "yaffs_yaffs1.h"
22753ac610SCharles Manning #include "yaffs_yaffs2.h"
23753ac610SCharles Manning #include "yaffs_bitmap.h"
24753ac610SCharles Manning #include "yaffs_verify.h"
250e8cc8bdSWilliam Juul #include "yaffs_nand.h"
260e8cc8bdSWilliam Juul #include "yaffs_packedtags2.h"
27753ac610SCharles Manning #include "yaffs_nameval.h"
28753ac610SCharles Manning #include "yaffs_allocator.h"
29753ac610SCharles Manning #include "yaffs_attribs.h"
30753ac610SCharles Manning #include "yaffs_summary.h"
310e8cc8bdSWilliam Juul
32753ac610SCharles Manning /* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
33753ac610SCharles Manning #define YAFFS_GC_GOOD_ENOUGH 2
34753ac610SCharles Manning #define YAFFS_GC_PASSIVE_THRESHOLD 4
350e8cc8bdSWilliam Juul
360e8cc8bdSWilliam Juul #include "yaffs_ecc.h"
370e8cc8bdSWilliam Juul
38753ac610SCharles Manning /* Forward declarations */
390e8cc8bdSWilliam Juul
40753ac610SCharles Manning static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
41753ac610SCharles Manning const u8 *buffer, int n_bytes, int use_reserve);
420e8cc8bdSWilliam Juul
430e8cc8bdSWilliam Juul
440e8cc8bdSWilliam Juul
450e8cc8bdSWilliam Juul /* Function to calculate chunk and offset */
460e8cc8bdSWilliam Juul
yaffs_addr_to_chunk(struct yaffs_dev * dev,loff_t addr,int * chunk_out,u32 * offset_out)47753ac610SCharles Manning void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
48753ac610SCharles Manning int *chunk_out, u32 *offset_out)
490e8cc8bdSWilliam Juul {
50753ac610SCharles Manning int chunk;
51753ac610SCharles Manning u32 offset;
52753ac610SCharles Manning
53753ac610SCharles Manning chunk = (u32) (addr >> dev->chunk_shift);
54753ac610SCharles Manning
55753ac610SCharles Manning if (dev->chunk_div == 1) {
56753ac610SCharles Manning /* easy power of 2 case */
57753ac610SCharles Manning offset = (u32) (addr & dev->chunk_mask);
58753ac610SCharles Manning } else {
59753ac610SCharles Manning /* Non power-of-2 case */
60753ac610SCharles Manning
61753ac610SCharles Manning loff_t chunk_base;
62753ac610SCharles Manning
63753ac610SCharles Manning chunk /= dev->chunk_div;
64753ac610SCharles Manning
65753ac610SCharles Manning chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
66753ac610SCharles Manning offset = (u32) (addr - chunk_base);
670e8cc8bdSWilliam Juul }
680e8cc8bdSWilliam Juul
69753ac610SCharles Manning *chunk_out = chunk;
70753ac610SCharles Manning *offset_out = offset;
71753ac610SCharles Manning }
72753ac610SCharles Manning
73753ac610SCharles Manning /* Function to return the number of shifts for a power of 2 greater than or
74753ac610SCharles Manning * equal to the given number
750e8cc8bdSWilliam Juul * Note we don't try to cater for all possible numbers and this does not have to
760e8cc8bdSWilliam Juul * be hellishly efficient.
770e8cc8bdSWilliam Juul */
780e8cc8bdSWilliam Juul
calc_shifts_ceiling(u32 x)79753ac610SCharles Manning static inline u32 calc_shifts_ceiling(u32 x)
800e8cc8bdSWilliam Juul {
81753ac610SCharles Manning int extra_bits;
82753ac610SCharles Manning int shifts;
830e8cc8bdSWilliam Juul
84753ac610SCharles Manning shifts = extra_bits = 0;
850e8cc8bdSWilliam Juul
860e8cc8bdSWilliam Juul while (x > 1) {
87753ac610SCharles Manning if (x & 1)
88753ac610SCharles Manning extra_bits++;
890e8cc8bdSWilliam Juul x >>= 1;
90753ac610SCharles Manning shifts++;
910e8cc8bdSWilliam Juul }
920e8cc8bdSWilliam Juul
93753ac610SCharles Manning if (extra_bits)
94753ac610SCharles Manning shifts++;
950e8cc8bdSWilliam Juul
96753ac610SCharles Manning return shifts;
970e8cc8bdSWilliam Juul }
980e8cc8bdSWilliam Juul
990e8cc8bdSWilliam Juul /* Function to return the number of shifts to get a 1 in bit 0
1000e8cc8bdSWilliam Juul */
1010e8cc8bdSWilliam Juul
calc_shifts(u32 x)102753ac610SCharles Manning static inline u32 calc_shifts(u32 x)
1030e8cc8bdSWilliam Juul {
104753ac610SCharles Manning u32 shifts;
1050e8cc8bdSWilliam Juul
106753ac610SCharles Manning shifts = 0;
1070e8cc8bdSWilliam Juul
108753ac610SCharles Manning if (!x)
109753ac610SCharles Manning return 0;
1100e8cc8bdSWilliam Juul
1110e8cc8bdSWilliam Juul while (!(x & 1)) {
1120e8cc8bdSWilliam Juul x >>= 1;
113753ac610SCharles Manning shifts++;
1140e8cc8bdSWilliam Juul }
1150e8cc8bdSWilliam Juul
116753ac610SCharles Manning return shifts;
1170e8cc8bdSWilliam Juul }
1180e8cc8bdSWilliam Juul
1190e8cc8bdSWilliam Juul /*
1200e8cc8bdSWilliam Juul * Temporary buffer manipulations.
1210e8cc8bdSWilliam Juul */
1220e8cc8bdSWilliam Juul
yaffs_init_tmp_buffers(struct yaffs_dev * dev)123753ac610SCharles Manning static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
1240e8cc8bdSWilliam Juul {
1250e8cc8bdSWilliam Juul int i;
126753ac610SCharles Manning u8 *buf = (u8 *) 1;
1270e8cc8bdSWilliam Juul
128753ac610SCharles Manning memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
1290e8cc8bdSWilliam Juul
1300e8cc8bdSWilliam Juul for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
131753ac610SCharles Manning dev->temp_buffer[i].in_use = 0;
132753ac610SCharles Manning buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
133753ac610SCharles Manning dev->temp_buffer[i].buffer = buf;
1340e8cc8bdSWilliam Juul }
1350e8cc8bdSWilliam Juul
1360e8cc8bdSWilliam Juul return buf ? YAFFS_OK : YAFFS_FAIL;
1370e8cc8bdSWilliam Juul }
1380e8cc8bdSWilliam Juul
yaffs_get_temp_buffer(struct yaffs_dev * dev)139753ac610SCharles Manning u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
1400e8cc8bdSWilliam Juul {
141753ac610SCharles Manning int i;
142753ac610SCharles Manning
143753ac610SCharles Manning dev->temp_in_use++;
144753ac610SCharles Manning if (dev->temp_in_use > dev->max_temp)
145753ac610SCharles Manning dev->max_temp = dev->temp_in_use;
146753ac610SCharles Manning
1470e8cc8bdSWilliam Juul for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
148753ac610SCharles Manning if (dev->temp_buffer[i].in_use == 0) {
149753ac610SCharles Manning dev->temp_buffer[i].in_use = 1;
150753ac610SCharles Manning return dev->temp_buffer[i].buffer;
1510e8cc8bdSWilliam Juul }
1520e8cc8bdSWilliam Juul }
1530e8cc8bdSWilliam Juul
154753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
1550e8cc8bdSWilliam Juul /*
1560e8cc8bdSWilliam Juul * If we got here then we have to allocate an unmanaged one
1570e8cc8bdSWilliam Juul * This is not good.
1580e8cc8bdSWilliam Juul */
1590e8cc8bdSWilliam Juul
160753ac610SCharles Manning dev->unmanaged_buffer_allocs++;
161753ac610SCharles Manning return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
1620e8cc8bdSWilliam Juul
1630e8cc8bdSWilliam Juul }
1640e8cc8bdSWilliam Juul
yaffs_release_temp_buffer(struct yaffs_dev * dev,u8 * buffer)165753ac610SCharles Manning void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
1660e8cc8bdSWilliam Juul {
1670e8cc8bdSWilliam Juul int i;
168753ac610SCharles Manning
169753ac610SCharles Manning dev->temp_in_use--;
170753ac610SCharles Manning
1710e8cc8bdSWilliam Juul for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
172753ac610SCharles Manning if (dev->temp_buffer[i].buffer == buffer) {
173753ac610SCharles Manning dev->temp_buffer[i].in_use = 0;
1740e8cc8bdSWilliam Juul return;
1750e8cc8bdSWilliam Juul }
1760e8cc8bdSWilliam Juul }
1770e8cc8bdSWilliam Juul
1780e8cc8bdSWilliam Juul if (buffer) {
1790e8cc8bdSWilliam Juul /* assume it is an unmanaged one. */
180753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_BUFFERS,
181753ac610SCharles Manning "Releasing unmanaged temp buffer");
182753ac610SCharles Manning kfree(buffer);
183753ac610SCharles Manning dev->unmanaged_buffer_deallocs++;
1840e8cc8bdSWilliam Juul }
1850e8cc8bdSWilliam Juul
1860e8cc8bdSWilliam Juul }
1870e8cc8bdSWilliam Juul
1880e8cc8bdSWilliam Juul /*
1890e8cc8bdSWilliam Juul * Determine if we have a managed buffer.
1900e8cc8bdSWilliam Juul */
yaffs_is_managed_tmp_buffer(struct yaffs_dev * dev,const u8 * buffer)191753ac610SCharles Manning int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 *buffer)
1920e8cc8bdSWilliam Juul {
1930e8cc8bdSWilliam Juul int i;
194753ac610SCharles Manning
1950e8cc8bdSWilliam Juul for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
196753ac610SCharles Manning if (dev->temp_buffer[i].buffer == buffer)
1970e8cc8bdSWilliam Juul return 1;
1980e8cc8bdSWilliam Juul }
1990e8cc8bdSWilliam Juul
200753ac610SCharles Manning for (i = 0; i < dev->param.n_caches; i++) {
201753ac610SCharles Manning if (dev->cache[i].data == buffer)
2020e8cc8bdSWilliam Juul return 1;
2030e8cc8bdSWilliam Juul }
2040e8cc8bdSWilliam Juul
205753ac610SCharles Manning if (buffer == dev->checkpt_buffer)
2060e8cc8bdSWilliam Juul return 1;
2070e8cc8bdSWilliam Juul
208753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
209753ac610SCharles Manning "yaffs: unmaged buffer detected.");
2100e8cc8bdSWilliam Juul return 0;
2110e8cc8bdSWilliam Juul }
2120e8cc8bdSWilliam Juul
2130e8cc8bdSWilliam Juul /*
214753ac610SCharles Manning * Functions for robustisizing TODO
215753ac610SCharles Manning *
2160e8cc8bdSWilliam Juul */
2170e8cc8bdSWilliam Juul
yaffs_handle_chunk_wr_ok(struct yaffs_dev * dev,int nand_chunk,const u8 * data,const struct yaffs_ext_tags * tags)218753ac610SCharles Manning static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
219753ac610SCharles Manning const u8 *data,
220753ac610SCharles Manning const struct yaffs_ext_tags *tags)
2210e8cc8bdSWilliam Juul {
2220e8cc8bdSWilliam Juul }
2230e8cc8bdSWilliam Juul
yaffs_handle_chunk_update(struct yaffs_dev * dev,int nand_chunk,const struct yaffs_ext_tags * tags)224753ac610SCharles Manning static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
225753ac610SCharles Manning const struct yaffs_ext_tags *tags)
2260e8cc8bdSWilliam Juul {
2270e8cc8bdSWilliam Juul }
2280e8cc8bdSWilliam Juul
yaffs_handle_chunk_error(struct yaffs_dev * dev,struct yaffs_block_info * bi)229753ac610SCharles Manning void yaffs_handle_chunk_error(struct yaffs_dev *dev,
230753ac610SCharles Manning struct yaffs_block_info *bi)
2310e8cc8bdSWilliam Juul {
232753ac610SCharles Manning if (!bi->gc_prioritise) {
233753ac610SCharles Manning bi->gc_prioritise = 1;
234753ac610SCharles Manning dev->has_pending_prioritised_gc = 1;
235753ac610SCharles Manning bi->chunk_error_strikes++;
2360e8cc8bdSWilliam Juul
237753ac610SCharles Manning if (bi->chunk_error_strikes > 3) {
238753ac610SCharles Manning bi->needs_retiring = 1; /* Too many stikes, so retire */
239753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
240753ac610SCharles Manning "yaffs: Block struck out");
241753ac610SCharles Manning
242753ac610SCharles Manning }
243753ac610SCharles Manning }
2440e8cc8bdSWilliam Juul }
2450e8cc8bdSWilliam Juul
yaffs_handle_chunk_wr_error(struct yaffs_dev * dev,int nand_chunk,int erased_ok)246753ac610SCharles Manning static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
247753ac610SCharles Manning int erased_ok)
2480e8cc8bdSWilliam Juul {
249753ac610SCharles Manning int flash_block = nand_chunk / dev->param.chunks_per_block;
250753ac610SCharles Manning struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
2510e8cc8bdSWilliam Juul
252753ac610SCharles Manning yaffs_handle_chunk_error(dev, bi);
2530e8cc8bdSWilliam Juul
254753ac610SCharles Manning if (erased_ok) {
255753ac610SCharles Manning /* Was an actual write failure,
256753ac610SCharles Manning * so mark the block for retirement.*/
257753ac610SCharles Manning bi->needs_retiring = 1;
258753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
259753ac610SCharles Manning "**>> Block %d needs retiring", flash_block);
2600e8cc8bdSWilliam Juul }
2610e8cc8bdSWilliam Juul
262753ac610SCharles Manning /* Delete the chunk */
263753ac610SCharles Manning yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
264753ac610SCharles Manning yaffs_skip_rest_of_block(dev);
2650e8cc8bdSWilliam Juul }
2660e8cc8bdSWilliam Juul
2670e8cc8bdSWilliam Juul /*
2680e8cc8bdSWilliam Juul * Verification code
2690e8cc8bdSWilliam Juul */
2700e8cc8bdSWilliam Juul
2710e8cc8bdSWilliam Juul /*
2720e8cc8bdSWilliam Juul * Simple hash function. Needs to have a reasonable spread
2730e8cc8bdSWilliam Juul */
2740e8cc8bdSWilliam Juul
yaffs_hash_fn(int n)275753ac610SCharles Manning static inline int yaffs_hash_fn(int n)
2760e8cc8bdSWilliam Juul {
27790ef117bSWilliam Juul if (n < 0)
27890ef117bSWilliam Juul n = -n;
279753ac610SCharles Manning return n % YAFFS_NOBJECT_BUCKETS;
2800e8cc8bdSWilliam Juul }
2810e8cc8bdSWilliam Juul
2820e8cc8bdSWilliam Juul /*
283753ac610SCharles Manning * Access functions to useful fake objects.
284753ac610SCharles Manning * Note that root might have a presence in NAND if permissions are set.
2850e8cc8bdSWilliam Juul */
2860e8cc8bdSWilliam Juul
yaffs_root(struct yaffs_dev * dev)287753ac610SCharles Manning struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
2880e8cc8bdSWilliam Juul {
289753ac610SCharles Manning return dev->root_dir;
2900e8cc8bdSWilliam Juul }
2910e8cc8bdSWilliam Juul
yaffs_lost_n_found(struct yaffs_dev * dev)292753ac610SCharles Manning struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
2930e8cc8bdSWilliam Juul {
294753ac610SCharles Manning return dev->lost_n_found;
2950e8cc8bdSWilliam Juul }
2960e8cc8bdSWilliam Juul
2970e8cc8bdSWilliam Juul /*
2980e8cc8bdSWilliam Juul * Erased NAND checking functions
2990e8cc8bdSWilliam Juul */
3000e8cc8bdSWilliam Juul
yaffs_check_ff(u8 * buffer,int n_bytes)301753ac610SCharles Manning int yaffs_check_ff(u8 *buffer, int n_bytes)
3020e8cc8bdSWilliam Juul {
3030e8cc8bdSWilliam Juul /* Horrible, slow implementation */
304753ac610SCharles Manning while (n_bytes--) {
305753ac610SCharles Manning if (*buffer != 0xff)
3060e8cc8bdSWilliam Juul return 0;
3070e8cc8bdSWilliam Juul buffer++;
3080e8cc8bdSWilliam Juul }
3090e8cc8bdSWilliam Juul return 1;
3100e8cc8bdSWilliam Juul }
3110e8cc8bdSWilliam Juul
yaffs_check_chunk_erased(struct yaffs_dev * dev,int nand_chunk)312753ac610SCharles Manning static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
3130e8cc8bdSWilliam Juul {
3140e8cc8bdSWilliam Juul int retval = YAFFS_OK;
315753ac610SCharles Manning u8 *data = yaffs_get_temp_buffer(dev);
316753ac610SCharles Manning struct yaffs_ext_tags tags;
3170e8cc8bdSWilliam Juul
3188cc64bafSAnatolij Gustschin yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
3190e8cc8bdSWilliam Juul
320753ac610SCharles Manning if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
3210e8cc8bdSWilliam Juul retval = YAFFS_FAIL;
3220e8cc8bdSWilliam Juul
323753ac610SCharles Manning if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
324753ac610SCharles Manning tags.chunk_used) {
325753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_NANDACCESS,
326753ac610SCharles Manning "Chunk %d not erased", nand_chunk);
3270e8cc8bdSWilliam Juul retval = YAFFS_FAIL;
3280e8cc8bdSWilliam Juul }
3290e8cc8bdSWilliam Juul
330753ac610SCharles Manning yaffs_release_temp_buffer(dev, data);
3310e8cc8bdSWilliam Juul
3320e8cc8bdSWilliam Juul return retval;
3330e8cc8bdSWilliam Juul
3340e8cc8bdSWilliam Juul }
3350e8cc8bdSWilliam Juul
yaffs_verify_chunk_written(struct yaffs_dev * dev,int nand_chunk,const u8 * data,struct yaffs_ext_tags * tags)336753ac610SCharles Manning static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
337753ac610SCharles Manning int nand_chunk,
338753ac610SCharles Manning const u8 *data,
339753ac610SCharles Manning struct yaffs_ext_tags *tags)
340753ac610SCharles Manning {
341753ac610SCharles Manning int retval = YAFFS_OK;
342753ac610SCharles Manning struct yaffs_ext_tags temp_tags;
343753ac610SCharles Manning u8 *buffer = yaffs_get_temp_buffer(dev);
344753ac610SCharles Manning
3458cc64bafSAnatolij Gustschin yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
346753ac610SCharles Manning if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
347753ac610SCharles Manning temp_tags.obj_id != tags->obj_id ||
348753ac610SCharles Manning temp_tags.chunk_id != tags->chunk_id ||
349753ac610SCharles Manning temp_tags.n_bytes != tags->n_bytes)
350753ac610SCharles Manning retval = YAFFS_FAIL;
351753ac610SCharles Manning
352753ac610SCharles Manning yaffs_release_temp_buffer(dev, buffer);
353753ac610SCharles Manning
354753ac610SCharles Manning return retval;
355753ac610SCharles Manning }
356753ac610SCharles Manning
357753ac610SCharles Manning
yaffs_check_alloc_available(struct yaffs_dev * dev,int n_chunks)358753ac610SCharles Manning int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
359753ac610SCharles Manning {
360753ac610SCharles Manning int reserved_chunks;
361753ac610SCharles Manning int reserved_blocks = dev->param.n_reserved_blocks;
362753ac610SCharles Manning int checkpt_blocks;
363753ac610SCharles Manning
364753ac610SCharles Manning checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
365753ac610SCharles Manning
366753ac610SCharles Manning reserved_chunks =
367753ac610SCharles Manning (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
368753ac610SCharles Manning
369753ac610SCharles Manning return (dev->n_free_chunks > (reserved_chunks + n_chunks));
370753ac610SCharles Manning }
371753ac610SCharles Manning
yaffs_find_alloc_block(struct yaffs_dev * dev)372753ac610SCharles Manning static int yaffs_find_alloc_block(struct yaffs_dev *dev)
373753ac610SCharles Manning {
374753ac610SCharles Manning int i;
375753ac610SCharles Manning struct yaffs_block_info *bi;
376753ac610SCharles Manning
377753ac610SCharles Manning if (dev->n_erased_blocks < 1) {
378753ac610SCharles Manning /* Hoosterman we've got a problem.
379753ac610SCharles Manning * Can't get space to gc
380753ac610SCharles Manning */
381753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
382753ac610SCharles Manning "yaffs tragedy: no more erased blocks");
383753ac610SCharles Manning
384753ac610SCharles Manning return -1;
385753ac610SCharles Manning }
386753ac610SCharles Manning
387753ac610SCharles Manning /* Find an empty block. */
388753ac610SCharles Manning
389753ac610SCharles Manning for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
390753ac610SCharles Manning dev->alloc_block_finder++;
391753ac610SCharles Manning if (dev->alloc_block_finder < dev->internal_start_block
392753ac610SCharles Manning || dev->alloc_block_finder > dev->internal_end_block) {
393753ac610SCharles Manning dev->alloc_block_finder = dev->internal_start_block;
394753ac610SCharles Manning }
395753ac610SCharles Manning
396753ac610SCharles Manning bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
397753ac610SCharles Manning
398753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
399753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
400753ac610SCharles Manning dev->seq_number++;
401753ac610SCharles Manning bi->seq_number = dev->seq_number;
402753ac610SCharles Manning dev->n_erased_blocks--;
403753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALLOCATE,
404753ac610SCharles Manning "Allocated block %d, seq %d, %d left" ,
405753ac610SCharles Manning dev->alloc_block_finder, dev->seq_number,
406753ac610SCharles Manning dev->n_erased_blocks);
407753ac610SCharles Manning return dev->alloc_block_finder;
408753ac610SCharles Manning }
409753ac610SCharles Manning }
410753ac610SCharles Manning
411753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
412753ac610SCharles Manning "yaffs tragedy: no more erased blocks, but there should have been %d",
413753ac610SCharles Manning dev->n_erased_blocks);
414753ac610SCharles Manning
415753ac610SCharles Manning return -1;
416753ac610SCharles Manning }
417753ac610SCharles Manning
yaffs_alloc_chunk(struct yaffs_dev * dev,int use_reserver,struct yaffs_block_info ** block_ptr)418753ac610SCharles Manning static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
419753ac610SCharles Manning struct yaffs_block_info **block_ptr)
420753ac610SCharles Manning {
421753ac610SCharles Manning int ret_val;
422753ac610SCharles Manning struct yaffs_block_info *bi;
423753ac610SCharles Manning
424753ac610SCharles Manning if (dev->alloc_block < 0) {
425753ac610SCharles Manning /* Get next block to allocate off */
426753ac610SCharles Manning dev->alloc_block = yaffs_find_alloc_block(dev);
427753ac610SCharles Manning dev->alloc_page = 0;
428753ac610SCharles Manning }
429753ac610SCharles Manning
430753ac610SCharles Manning if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
431753ac610SCharles Manning /* No space unless we're allowed to use the reserve. */
432753ac610SCharles Manning return -1;
433753ac610SCharles Manning }
434753ac610SCharles Manning
435753ac610SCharles Manning if (dev->n_erased_blocks < dev->param.n_reserved_blocks
436753ac610SCharles Manning && dev->alloc_page == 0)
437753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
438753ac610SCharles Manning
439753ac610SCharles Manning /* Next page please.... */
440753ac610SCharles Manning if (dev->alloc_block >= 0) {
441753ac610SCharles Manning bi = yaffs_get_block_info(dev, dev->alloc_block);
442753ac610SCharles Manning
443753ac610SCharles Manning ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
444753ac610SCharles Manning dev->alloc_page;
445753ac610SCharles Manning bi->pages_in_use++;
446753ac610SCharles Manning yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
447753ac610SCharles Manning
448753ac610SCharles Manning dev->alloc_page++;
449753ac610SCharles Manning
450753ac610SCharles Manning dev->n_free_chunks--;
451753ac610SCharles Manning
452753ac610SCharles Manning /* If the block is full set the state to full */
453753ac610SCharles Manning if (dev->alloc_page >= dev->param.chunks_per_block) {
454753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_FULL;
455753ac610SCharles Manning dev->alloc_block = -1;
456753ac610SCharles Manning }
457753ac610SCharles Manning
458753ac610SCharles Manning if (block_ptr)
459753ac610SCharles Manning *block_ptr = bi;
460753ac610SCharles Manning
461753ac610SCharles Manning return ret_val;
462753ac610SCharles Manning }
463753ac610SCharles Manning
464753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
465753ac610SCharles Manning "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
466753ac610SCharles Manning
467753ac610SCharles Manning return -1;
468753ac610SCharles Manning }
469753ac610SCharles Manning
yaffs_get_erased_chunks(struct yaffs_dev * dev)470753ac610SCharles Manning static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
471753ac610SCharles Manning {
472753ac610SCharles Manning int n;
473753ac610SCharles Manning
474753ac610SCharles Manning n = dev->n_erased_blocks * dev->param.chunks_per_block;
475753ac610SCharles Manning
476753ac610SCharles Manning if (dev->alloc_block > 0)
477753ac610SCharles Manning n += (dev->param.chunks_per_block - dev->alloc_page);
478753ac610SCharles Manning
479753ac610SCharles Manning return n;
480753ac610SCharles Manning
481753ac610SCharles Manning }
482753ac610SCharles Manning
483753ac610SCharles Manning /*
484753ac610SCharles Manning * yaffs_skip_rest_of_block() skips over the rest of the allocation block
485753ac610SCharles Manning * if we don't want to write to it.
486753ac610SCharles Manning */
yaffs_skip_rest_of_block(struct yaffs_dev * dev)487753ac610SCharles Manning void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
488753ac610SCharles Manning {
489753ac610SCharles Manning struct yaffs_block_info *bi;
490753ac610SCharles Manning
491753ac610SCharles Manning if (dev->alloc_block > 0) {
492753ac610SCharles Manning bi = yaffs_get_block_info(dev, dev->alloc_block);
493753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
494753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_FULL;
495753ac610SCharles Manning dev->alloc_block = -1;
496753ac610SCharles Manning }
497753ac610SCharles Manning }
498753ac610SCharles Manning }
499753ac610SCharles Manning
yaffs_write_new_chunk(struct yaffs_dev * dev,const u8 * data,struct yaffs_ext_tags * tags,int use_reserver)500753ac610SCharles Manning static int yaffs_write_new_chunk(struct yaffs_dev *dev,
501753ac610SCharles Manning const u8 *data,
502753ac610SCharles Manning struct yaffs_ext_tags *tags, int use_reserver)
5030e8cc8bdSWilliam Juul {
5040e8cc8bdSWilliam Juul int attempts = 0;
505753ac610SCharles Manning int write_ok = 0;
5060e8cc8bdSWilliam Juul int chunk;
5070e8cc8bdSWilliam Juul
508753ac610SCharles Manning yaffs2_checkpt_invalidate(dev);
5090e8cc8bdSWilliam Juul
5100e8cc8bdSWilliam Juul do {
511753ac610SCharles Manning struct yaffs_block_info *bi = 0;
512753ac610SCharles Manning int erased_ok = 0;
5130e8cc8bdSWilliam Juul
514753ac610SCharles Manning chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
5150e8cc8bdSWilliam Juul if (chunk < 0) {
5160e8cc8bdSWilliam Juul /* no space */
5170e8cc8bdSWilliam Juul break;
5180e8cc8bdSWilliam Juul }
5190e8cc8bdSWilliam Juul
5200e8cc8bdSWilliam Juul /* First check this chunk is erased, if it needs
5210e8cc8bdSWilliam Juul * checking. The checking policy (unless forced
5220e8cc8bdSWilliam Juul * always on) is as follows:
5230e8cc8bdSWilliam Juul *
5240e8cc8bdSWilliam Juul * Check the first page we try to write in a block.
5250e8cc8bdSWilliam Juul * If the check passes then we don't need to check any
5260e8cc8bdSWilliam Juul * more. If the check fails, we check again...
5270e8cc8bdSWilliam Juul * If the block has been erased, we don't need to check.
5280e8cc8bdSWilliam Juul *
5290e8cc8bdSWilliam Juul * However, if the block has been prioritised for gc,
5300e8cc8bdSWilliam Juul * then we think there might be something odd about
5310e8cc8bdSWilliam Juul * this block and stop using it.
5320e8cc8bdSWilliam Juul *
5330e8cc8bdSWilliam Juul * Rationale: We should only ever see chunks that have
5340e8cc8bdSWilliam Juul * not been erased if there was a partially written
5350e8cc8bdSWilliam Juul * chunk due to power loss. This checking policy should
5360e8cc8bdSWilliam Juul * catch that case with very few checks and thus save a
5370e8cc8bdSWilliam Juul * lot of checks that are most likely not needed.
538753ac610SCharles Manning *
539753ac610SCharles Manning * Mods to the above
540753ac610SCharles Manning * If an erase check fails or the write fails we skip the
541753ac610SCharles Manning * rest of the block.
5420e8cc8bdSWilliam Juul */
5430e8cc8bdSWilliam Juul
5440e8cc8bdSWilliam Juul /* let's give it a try */
5450e8cc8bdSWilliam Juul attempts++;
5460e8cc8bdSWilliam Juul
547753ac610SCharles Manning if (dev->param.always_check_erased)
548753ac610SCharles Manning bi->skip_erased_check = 0;
5490e8cc8bdSWilliam Juul
550753ac610SCharles Manning if (!bi->skip_erased_check) {
551753ac610SCharles Manning erased_ok = yaffs_check_chunk_erased(dev, chunk);
552753ac610SCharles Manning if (erased_ok != YAFFS_OK) {
553753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
554753ac610SCharles Manning "**>> yaffs chunk %d was not erased",
555753ac610SCharles Manning chunk);
556753ac610SCharles Manning
557753ac610SCharles Manning /* If not erased, delete this one,
558753ac610SCharles Manning * skip rest of block and
559753ac610SCharles Manning * try another chunk */
560753ac610SCharles Manning yaffs_chunk_del(dev, chunk, 1, __LINE__);
561753ac610SCharles Manning yaffs_skip_rest_of_block(dev);
5620e8cc8bdSWilliam Juul continue;
5630e8cc8bdSWilliam Juul }
5640e8cc8bdSWilliam Juul }
5650e8cc8bdSWilliam Juul
566753ac610SCharles Manning write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
567753ac610SCharles Manning
568753ac610SCharles Manning if (!bi->skip_erased_check)
569753ac610SCharles Manning write_ok =
570753ac610SCharles Manning yaffs_verify_chunk_written(dev, chunk, data, tags);
571753ac610SCharles Manning
572753ac610SCharles Manning if (write_ok != YAFFS_OK) {
573753ac610SCharles Manning /* Clean up aborted write, skip to next block and
574753ac610SCharles Manning * try another chunk */
575753ac610SCharles Manning yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
5760e8cc8bdSWilliam Juul continue;
5770e8cc8bdSWilliam Juul }
5780e8cc8bdSWilliam Juul
579753ac610SCharles Manning bi->skip_erased_check = 1;
580753ac610SCharles Manning
5810e8cc8bdSWilliam Juul /* Copy the data into the robustification buffer */
582753ac610SCharles Manning yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
5830e8cc8bdSWilliam Juul
584753ac610SCharles Manning } while (write_ok != YAFFS_OK &&
5850e8cc8bdSWilliam Juul (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
5860e8cc8bdSWilliam Juul
587753ac610SCharles Manning if (!write_ok)
5880e8cc8bdSWilliam Juul chunk = -1;
5890e8cc8bdSWilliam Juul
5900e8cc8bdSWilliam Juul if (attempts > 1) {
591753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
592753ac610SCharles Manning "**>> yaffs write required %d attempts",
593753ac610SCharles Manning attempts);
594753ac610SCharles Manning dev->n_retried_writes += (attempts - 1);
5950e8cc8bdSWilliam Juul }
5960e8cc8bdSWilliam Juul
5970e8cc8bdSWilliam Juul return chunk;
5980e8cc8bdSWilliam Juul }
5990e8cc8bdSWilliam Juul
6000e8cc8bdSWilliam Juul /*
6010e8cc8bdSWilliam Juul * Block retiring for handling a broken block.
6020e8cc8bdSWilliam Juul */
6030e8cc8bdSWilliam Juul
yaffs_retire_block(struct yaffs_dev * dev,int flash_block)604753ac610SCharles Manning static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
6050e8cc8bdSWilliam Juul {
606753ac610SCharles Manning struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
6070e8cc8bdSWilliam Juul
608753ac610SCharles Manning yaffs2_checkpt_invalidate(dev);
6090e8cc8bdSWilliam Juul
610753ac610SCharles Manning yaffs2_clear_oldest_dirty_seq(dev, bi);
6110e8cc8bdSWilliam Juul
612753ac610SCharles Manning if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
613753ac610SCharles Manning if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
614753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
615753ac610SCharles Manning "yaffs: Failed to mark bad and erase block %d",
616753ac610SCharles Manning flash_block);
617753ac610SCharles Manning } else {
618753ac610SCharles Manning struct yaffs_ext_tags tags;
619753ac610SCharles Manning int chunk_id =
620753ac610SCharles Manning flash_block * dev->param.chunks_per_block;
6210e8cc8bdSWilliam Juul
622753ac610SCharles Manning u8 *buffer = yaffs_get_temp_buffer(dev);
6230e8cc8bdSWilliam Juul
624753ac610SCharles Manning memset(buffer, 0xff, dev->data_bytes_per_chunk);
625753ac610SCharles Manning memset(&tags, 0, sizeof(tags));
626753ac610SCharles Manning tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
627753ac610SCharles Manning if (dev->param.write_chunk_tags_fn(dev, chunk_id -
628753ac610SCharles Manning dev->chunk_offset,
629753ac610SCharles Manning buffer,
630753ac610SCharles Manning &tags) != YAFFS_OK)
631753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
632753ac610SCharles Manning "yaffs: Failed to write bad block marker to block %d",
633753ac610SCharles Manning flash_block);
6340e8cc8bdSWilliam Juul
635753ac610SCharles Manning yaffs_release_temp_buffer(dev, buffer);
6360e8cc8bdSWilliam Juul }
6370e8cc8bdSWilliam Juul }
6380e8cc8bdSWilliam Juul
639753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_DEAD;
640753ac610SCharles Manning bi->gc_prioritise = 0;
641753ac610SCharles Manning bi->needs_retiring = 0;
6420e8cc8bdSWilliam Juul
643753ac610SCharles Manning dev->n_retired_blocks++;
6440e8cc8bdSWilliam Juul }
6450e8cc8bdSWilliam Juul
6460e8cc8bdSWilliam Juul /*---------------- Name handling functions ------------*/
6470e8cc8bdSWilliam Juul
yaffs_calc_name_sum(const YCHAR * name)648753ac610SCharles Manning static u16 yaffs_calc_name_sum(const YCHAR *name)
6490e8cc8bdSWilliam Juul {
650753ac610SCharles Manning u16 sum = 0;
651753ac610SCharles Manning u16 i = 1;
6520e8cc8bdSWilliam Juul
653753ac610SCharles Manning if (!name)
654753ac610SCharles Manning return 0;
6550e8cc8bdSWilliam Juul
656753ac610SCharles Manning while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
657753ac610SCharles Manning
658753ac610SCharles Manning /* 0x1f mask is case insensitive */
659753ac610SCharles Manning sum += ((*name) & 0x1f) * i;
6600e8cc8bdSWilliam Juul i++;
661753ac610SCharles Manning name++;
6620e8cc8bdSWilliam Juul }
6630e8cc8bdSWilliam Juul return sum;
6640e8cc8bdSWilliam Juul }
6650e8cc8bdSWilliam Juul
yaffs_set_obj_name(struct yaffs_obj * obj,const YCHAR * name)666753ac610SCharles Manning void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
6670e8cc8bdSWilliam Juul {
668753ac610SCharles Manning memset(obj->short_name, 0, sizeof(obj->short_name));
669753ac610SCharles Manning if (name &&
670753ac610SCharles Manning yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
671753ac610SCharles Manning YAFFS_SHORT_NAME_LENGTH)
672753ac610SCharles Manning yaffs_strcpy(obj->short_name, name);
673753ac610SCharles Manning else
674753ac610SCharles Manning obj->short_name[0] = _Y('\0');
675753ac610SCharles Manning obj->sum = yaffs_calc_name_sum(name);
6760e8cc8bdSWilliam Juul }
677753ac610SCharles Manning
yaffs_set_obj_name_from_oh(struct yaffs_obj * obj,const struct yaffs_obj_hdr * oh)678753ac610SCharles Manning void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
679753ac610SCharles Manning const struct yaffs_obj_hdr *oh)
680753ac610SCharles Manning {
681753ac610SCharles Manning #ifdef CONFIG_YAFFS_AUTO_UNICODE
682753ac610SCharles Manning YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
683753ac610SCharles Manning memset(tmp_name, 0, sizeof(tmp_name));
684753ac610SCharles Manning yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
685753ac610SCharles Manning YAFFS_MAX_NAME_LENGTH + 1);
686753ac610SCharles Manning yaffs_set_obj_name(obj, tmp_name);
687753ac610SCharles Manning #else
688753ac610SCharles Manning yaffs_set_obj_name(obj, oh->name);
6890e8cc8bdSWilliam Juul #endif
690753ac610SCharles Manning }
691753ac610SCharles Manning
yaffs_max_file_size(struct yaffs_dev * dev)692753ac610SCharles Manning loff_t yaffs_max_file_size(struct yaffs_dev *dev)
693753ac610SCharles Manning {
694753ac610SCharles Manning return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
6950e8cc8bdSWilliam Juul }
6960e8cc8bdSWilliam Juul
6970e8cc8bdSWilliam Juul /*-------------------- TNODES -------------------
6980e8cc8bdSWilliam Juul
6990e8cc8bdSWilliam Juul * List of spare tnodes
7000e8cc8bdSWilliam Juul * The list is hooked together using the first pointer
7010e8cc8bdSWilliam Juul * in the tnode.
7020e8cc8bdSWilliam Juul */
7030e8cc8bdSWilliam Juul
yaffs_get_tnode(struct yaffs_dev * dev)704753ac610SCharles Manning struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
7050e8cc8bdSWilliam Juul {
706753ac610SCharles Manning struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
7070e8cc8bdSWilliam Juul
708753ac610SCharles Manning if (tn) {
709753ac610SCharles Manning memset(tn, 0, dev->tnode_size);
710753ac610SCharles Manning dev->n_tnodes++;
7110e8cc8bdSWilliam Juul }
7120e8cc8bdSWilliam Juul
713753ac610SCharles Manning dev->checkpoint_blocks_required = 0; /* force recalculation */
7140e8cc8bdSWilliam Juul
7150e8cc8bdSWilliam Juul return tn;
7160e8cc8bdSWilliam Juul }
7170e8cc8bdSWilliam Juul
7180e8cc8bdSWilliam Juul /* FreeTnode frees up a tnode and puts it back on the free list */
yaffs_free_tnode(struct yaffs_dev * dev,struct yaffs_tnode * tn)719753ac610SCharles Manning static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
7200e8cc8bdSWilliam Juul {
721753ac610SCharles Manning yaffs_free_raw_tnode(dev, tn);
722753ac610SCharles Manning dev->n_tnodes--;
723753ac610SCharles Manning dev->checkpoint_blocks_required = 0; /* force recalculation */
7240e8cc8bdSWilliam Juul }
7250e8cc8bdSWilliam Juul
yaffs_deinit_tnodes_and_objs(struct yaffs_dev * dev)726753ac610SCharles Manning static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
7270e8cc8bdSWilliam Juul {
728753ac610SCharles Manning yaffs_deinit_raw_tnodes_and_objs(dev);
729753ac610SCharles Manning dev->n_obj = 0;
730753ac610SCharles Manning dev->n_tnodes = 0;
7310e8cc8bdSWilliam Juul }
7320e8cc8bdSWilliam Juul
yaffs_load_tnode_0(struct yaffs_dev * dev,struct yaffs_tnode * tn,unsigned pos,unsigned val)733753ac610SCharles Manning void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
734753ac610SCharles Manning unsigned pos, unsigned val)
7350e8cc8bdSWilliam Juul {
736753ac610SCharles Manning u32 *map = (u32 *) tn;
737753ac610SCharles Manning u32 bit_in_map;
738753ac610SCharles Manning u32 bit_in_word;
739753ac610SCharles Manning u32 word_in_map;
740753ac610SCharles Manning u32 mask;
7410e8cc8bdSWilliam Juul
7420e8cc8bdSWilliam Juul pos &= YAFFS_TNODES_LEVEL0_MASK;
743753ac610SCharles Manning val >>= dev->chunk_grp_bits;
7440e8cc8bdSWilliam Juul
745753ac610SCharles Manning bit_in_map = pos * dev->tnode_width;
746753ac610SCharles Manning word_in_map = bit_in_map / 32;
747753ac610SCharles Manning bit_in_word = bit_in_map & (32 - 1);
7480e8cc8bdSWilliam Juul
749753ac610SCharles Manning mask = dev->tnode_mask << bit_in_word;
7500e8cc8bdSWilliam Juul
751753ac610SCharles Manning map[word_in_map] &= ~mask;
752753ac610SCharles Manning map[word_in_map] |= (mask & (val << bit_in_word));
7530e8cc8bdSWilliam Juul
754753ac610SCharles Manning if (dev->tnode_width > (32 - bit_in_word)) {
755753ac610SCharles Manning bit_in_word = (32 - bit_in_word);
756753ac610SCharles Manning word_in_map++;
757753ac610SCharles Manning mask =
758753ac610SCharles Manning dev->tnode_mask >> bit_in_word;
759753ac610SCharles Manning map[word_in_map] &= ~mask;
760753ac610SCharles Manning map[word_in_map] |= (mask & (val >> bit_in_word));
7610e8cc8bdSWilliam Juul }
7620e8cc8bdSWilliam Juul }
7630e8cc8bdSWilliam Juul
yaffs_get_group_base(struct yaffs_dev * dev,struct yaffs_tnode * tn,unsigned pos)764753ac610SCharles Manning u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
765753ac610SCharles Manning unsigned pos)
7660e8cc8bdSWilliam Juul {
767753ac610SCharles Manning u32 *map = (u32 *) tn;
768753ac610SCharles Manning u32 bit_in_map;
769753ac610SCharles Manning u32 bit_in_word;
770753ac610SCharles Manning u32 word_in_map;
771753ac610SCharles Manning u32 val;
7720e8cc8bdSWilliam Juul
7730e8cc8bdSWilliam Juul pos &= YAFFS_TNODES_LEVEL0_MASK;
7740e8cc8bdSWilliam Juul
775753ac610SCharles Manning bit_in_map = pos * dev->tnode_width;
776753ac610SCharles Manning word_in_map = bit_in_map / 32;
777753ac610SCharles Manning bit_in_word = bit_in_map & (32 - 1);
7780e8cc8bdSWilliam Juul
779753ac610SCharles Manning val = map[word_in_map] >> bit_in_word;
7800e8cc8bdSWilliam Juul
781753ac610SCharles Manning if (dev->tnode_width > (32 - bit_in_word)) {
782753ac610SCharles Manning bit_in_word = (32 - bit_in_word);
783753ac610SCharles Manning word_in_map++;
784753ac610SCharles Manning val |= (map[word_in_map] << bit_in_word);
7850e8cc8bdSWilliam Juul }
7860e8cc8bdSWilliam Juul
787753ac610SCharles Manning val &= dev->tnode_mask;
788753ac610SCharles Manning val <<= dev->chunk_grp_bits;
7890e8cc8bdSWilliam Juul
7900e8cc8bdSWilliam Juul return val;
7910e8cc8bdSWilliam Juul }
7920e8cc8bdSWilliam Juul
7930e8cc8bdSWilliam Juul /* ------------------- End of individual tnode manipulation -----------------*/
7940e8cc8bdSWilliam Juul
7950e8cc8bdSWilliam Juul /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
796753ac610SCharles Manning * The look up tree is represented by the top tnode and the number of top_level
7970e8cc8bdSWilliam Juul * in the tree. 0 means only the level 0 tnode is in the tree.
7980e8cc8bdSWilliam Juul */
7990e8cc8bdSWilliam Juul
8000e8cc8bdSWilliam Juul /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
yaffs_find_tnode_0(struct yaffs_dev * dev,struct yaffs_file_var * file_struct,u32 chunk_id)801753ac610SCharles Manning struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
802753ac610SCharles Manning struct yaffs_file_var *file_struct,
803753ac610SCharles Manning u32 chunk_id)
8040e8cc8bdSWilliam Juul {
805753ac610SCharles Manning struct yaffs_tnode *tn = file_struct->top;
806753ac610SCharles Manning u32 i;
807753ac610SCharles Manning int required_depth;
808753ac610SCharles Manning int level = file_struct->top_level;
8090e8cc8bdSWilliam Juul
8100e8cc8bdSWilliam Juul /* Check sane level and chunk Id */
811753ac610SCharles Manning if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
8120e8cc8bdSWilliam Juul return NULL;
8130e8cc8bdSWilliam Juul
814753ac610SCharles Manning if (chunk_id > YAFFS_MAX_CHUNK_ID)
8150e8cc8bdSWilliam Juul return NULL;
8160e8cc8bdSWilliam Juul
817753ac610SCharles Manning /* First check we're tall enough (ie enough top_level) */
8180e8cc8bdSWilliam Juul
819753ac610SCharles Manning i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
820753ac610SCharles Manning required_depth = 0;
8210e8cc8bdSWilliam Juul while (i) {
8220e8cc8bdSWilliam Juul i >>= YAFFS_TNODES_INTERNAL_BITS;
823753ac610SCharles Manning required_depth++;
8240e8cc8bdSWilliam Juul }
8250e8cc8bdSWilliam Juul
826753ac610SCharles Manning if (required_depth > file_struct->top_level)
827753ac610SCharles Manning return NULL; /* Not tall enough, so we can't find it */
8280e8cc8bdSWilliam Juul
8290e8cc8bdSWilliam Juul /* Traverse down to level 0 */
8300e8cc8bdSWilliam Juul while (level > 0 && tn) {
831753ac610SCharles Manning tn = tn->internal[(chunk_id >>
8320e8cc8bdSWilliam Juul (YAFFS_TNODES_LEVEL0_BITS +
8330e8cc8bdSWilliam Juul (level - 1) *
834753ac610SCharles Manning YAFFS_TNODES_INTERNAL_BITS)) &
8350e8cc8bdSWilliam Juul YAFFS_TNODES_INTERNAL_MASK];
8360e8cc8bdSWilliam Juul level--;
8370e8cc8bdSWilliam Juul }
8380e8cc8bdSWilliam Juul
8390e8cc8bdSWilliam Juul return tn;
8400e8cc8bdSWilliam Juul }
8410e8cc8bdSWilliam Juul
842753ac610SCharles Manning /* add_find_tnode_0 finds the level 0 tnode if it exists,
843753ac610SCharles Manning * otherwise first expands the tree.
8440e8cc8bdSWilliam Juul * This happens in two steps:
8450e8cc8bdSWilliam Juul * 1. If the tree isn't tall enough, then make it taller.
8460e8cc8bdSWilliam Juul * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
8470e8cc8bdSWilliam Juul *
8480e8cc8bdSWilliam Juul * Used when modifying the tree.
8490e8cc8bdSWilliam Juul *
850753ac610SCharles Manning * If the tn argument is NULL, then a fresh tnode will be added otherwise the
851753ac610SCharles Manning * specified tn will be plugged into the ttree.
8520e8cc8bdSWilliam Juul */
8530e8cc8bdSWilliam Juul
yaffs_add_find_tnode_0(struct yaffs_dev * dev,struct yaffs_file_var * file_struct,u32 chunk_id,struct yaffs_tnode * passed_tn)854753ac610SCharles Manning struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
855753ac610SCharles Manning struct yaffs_file_var *file_struct,
856753ac610SCharles Manning u32 chunk_id,
857753ac610SCharles Manning struct yaffs_tnode *passed_tn)
8580e8cc8bdSWilliam Juul {
859753ac610SCharles Manning int required_depth;
8600e8cc8bdSWilliam Juul int i;
8610e8cc8bdSWilliam Juul int l;
862753ac610SCharles Manning struct yaffs_tnode *tn;
863753ac610SCharles Manning u32 x;
8640e8cc8bdSWilliam Juul
8650e8cc8bdSWilliam Juul /* Check sane level and page Id */
866753ac610SCharles Manning if (file_struct->top_level < 0 ||
867753ac610SCharles Manning file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
8680e8cc8bdSWilliam Juul return NULL;
8690e8cc8bdSWilliam Juul
870753ac610SCharles Manning if (chunk_id > YAFFS_MAX_CHUNK_ID)
8710e8cc8bdSWilliam Juul return NULL;
8720e8cc8bdSWilliam Juul
873753ac610SCharles Manning /* First check we're tall enough (ie enough top_level) */
8740e8cc8bdSWilliam Juul
875753ac610SCharles Manning x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
876753ac610SCharles Manning required_depth = 0;
8770e8cc8bdSWilliam Juul while (x) {
8780e8cc8bdSWilliam Juul x >>= YAFFS_TNODES_INTERNAL_BITS;
879753ac610SCharles Manning required_depth++;
8800e8cc8bdSWilliam Juul }
8810e8cc8bdSWilliam Juul
882753ac610SCharles Manning if (required_depth > file_struct->top_level) {
8830e8cc8bdSWilliam Juul /* Not tall enough, gotta make the tree taller */
884753ac610SCharles Manning for (i = file_struct->top_level; i < required_depth; i++) {
8850e8cc8bdSWilliam Juul
886753ac610SCharles Manning tn = yaffs_get_tnode(dev);
8870e8cc8bdSWilliam Juul
8880e8cc8bdSWilliam Juul if (tn) {
889753ac610SCharles Manning tn->internal[0] = file_struct->top;
890753ac610SCharles Manning file_struct->top = tn;
891753ac610SCharles Manning file_struct->top_level++;
8920e8cc8bdSWilliam Juul } else {
893753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
894753ac610SCharles Manning "yaffs: no more tnodes");
895753ac610SCharles Manning return NULL;
8960e8cc8bdSWilliam Juul }
8970e8cc8bdSWilliam Juul }
8980e8cc8bdSWilliam Juul }
8990e8cc8bdSWilliam Juul
9000e8cc8bdSWilliam Juul /* Traverse down to level 0, adding anything we need */
9010e8cc8bdSWilliam Juul
902753ac610SCharles Manning l = file_struct->top_level;
903753ac610SCharles Manning tn = file_struct->top;
9040e8cc8bdSWilliam Juul
9050e8cc8bdSWilliam Juul if (l > 0) {
9060e8cc8bdSWilliam Juul while (l > 0 && tn) {
907753ac610SCharles Manning x = (chunk_id >>
9080e8cc8bdSWilliam Juul (YAFFS_TNODES_LEVEL0_BITS +
9090e8cc8bdSWilliam Juul (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
9100e8cc8bdSWilliam Juul YAFFS_TNODES_INTERNAL_MASK;
9110e8cc8bdSWilliam Juul
9120e8cc8bdSWilliam Juul if ((l > 1) && !tn->internal[x]) {
9130e8cc8bdSWilliam Juul /* Add missing non-level-zero tnode */
914753ac610SCharles Manning tn->internal[x] = yaffs_get_tnode(dev);
915753ac610SCharles Manning if (!tn->internal[x])
916753ac610SCharles Manning return NULL;
9170e8cc8bdSWilliam Juul } else if (l == 1) {
9180e8cc8bdSWilliam Juul /* Looking from level 1 at level 0 */
919753ac610SCharles Manning if (passed_tn) {
920753ac610SCharles Manning /* If we already have one, release it */
9210e8cc8bdSWilliam Juul if (tn->internal[x])
922753ac610SCharles Manning yaffs_free_tnode(dev,
923753ac610SCharles Manning tn->internal[x]);
924753ac610SCharles Manning tn->internal[x] = passed_tn;
9250e8cc8bdSWilliam Juul
9260e8cc8bdSWilliam Juul } else if (!tn->internal[x]) {
9270e8cc8bdSWilliam Juul /* Don't have one, none passed in */
928753ac610SCharles Manning tn->internal[x] = yaffs_get_tnode(dev);
929753ac610SCharles Manning if (!tn->internal[x])
930753ac610SCharles Manning return NULL;
9310e8cc8bdSWilliam Juul }
9320e8cc8bdSWilliam Juul }
9330e8cc8bdSWilliam Juul
9340e8cc8bdSWilliam Juul tn = tn->internal[x];
9350e8cc8bdSWilliam Juul l--;
9360e8cc8bdSWilliam Juul }
9370e8cc8bdSWilliam Juul } else {
9380e8cc8bdSWilliam Juul /* top is level 0 */
939753ac610SCharles Manning if (passed_tn) {
940753ac610SCharles Manning memcpy(tn, passed_tn,
941753ac610SCharles Manning (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
942753ac610SCharles Manning yaffs_free_tnode(dev, passed_tn);
9430e8cc8bdSWilliam Juul }
9440e8cc8bdSWilliam Juul }
9450e8cc8bdSWilliam Juul
9460e8cc8bdSWilliam Juul return tn;
9470e8cc8bdSWilliam Juul }
9480e8cc8bdSWilliam Juul
yaffs_tags_match(const struct yaffs_ext_tags * tags,int obj_id,int chunk_obj)949753ac610SCharles Manning static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
950753ac610SCharles Manning int chunk_obj)
951753ac610SCharles Manning {
952753ac610SCharles Manning return (tags->chunk_id == chunk_obj &&
953753ac610SCharles Manning tags->obj_id == obj_id &&
954753ac610SCharles Manning !tags->is_deleted) ? 1 : 0;
955753ac610SCharles Manning
956753ac610SCharles Manning }
957753ac610SCharles Manning
yaffs_find_chunk_in_group(struct yaffs_dev * dev,int the_chunk,struct yaffs_ext_tags * tags,int obj_id,int inode_chunk)958753ac610SCharles Manning static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
959753ac610SCharles Manning struct yaffs_ext_tags *tags, int obj_id,
960753ac610SCharles Manning int inode_chunk)
9610e8cc8bdSWilliam Juul {
9620e8cc8bdSWilliam Juul int j;
9630e8cc8bdSWilliam Juul
964753ac610SCharles Manning for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
965753ac610SCharles Manning if (yaffs_check_chunk_bit
966753ac610SCharles Manning (dev, the_chunk / dev->param.chunks_per_block,
967753ac610SCharles Manning the_chunk % dev->param.chunks_per_block)) {
9680e8cc8bdSWilliam Juul
969753ac610SCharles Manning if (dev->chunk_grp_size == 1)
970753ac610SCharles Manning return the_chunk;
971753ac610SCharles Manning else {
972753ac610SCharles Manning yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
973753ac610SCharles Manning tags);
974753ac610SCharles Manning if (yaffs_tags_match(tags,
975753ac610SCharles Manning obj_id, inode_chunk)) {
976753ac610SCharles Manning /* found it; */
977753ac610SCharles Manning return the_chunk;
9780e8cc8bdSWilliam Juul }
9790e8cc8bdSWilliam Juul }
980753ac610SCharles Manning }
981753ac610SCharles Manning the_chunk++;
9820e8cc8bdSWilliam Juul }
9830e8cc8bdSWilliam Juul return -1;
9840e8cc8bdSWilliam Juul }
9850e8cc8bdSWilliam Juul
yaffs_find_chunk_in_file(struct yaffs_obj * in,int inode_chunk,struct yaffs_ext_tags * tags)986753ac610SCharles Manning static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
987753ac610SCharles Manning struct yaffs_ext_tags *tags)
9880e8cc8bdSWilliam Juul {
989753ac610SCharles Manning /*Get the Tnode, then get the level 0 offset chunk offset */
990753ac610SCharles Manning struct yaffs_tnode *tn;
991753ac610SCharles Manning int the_chunk = -1;
992753ac610SCharles Manning struct yaffs_ext_tags local_tags;
993753ac610SCharles Manning int ret_val = -1;
994753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev;
9950e8cc8bdSWilliam Juul
996753ac610SCharles Manning if (!tags) {
997753ac610SCharles Manning /* Passed a NULL, so use our own tags space */
998753ac610SCharles Manning tags = &local_tags;
9990e8cc8bdSWilliam Juul }
10000e8cc8bdSWilliam Juul
1001753ac610SCharles Manning tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
1002753ac610SCharles Manning
1003753ac610SCharles Manning if (!tn)
1004753ac610SCharles Manning return ret_val;
1005753ac610SCharles Manning
1006753ac610SCharles Manning the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
1007753ac610SCharles Manning
1008753ac610SCharles Manning ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
1009753ac610SCharles Manning inode_chunk);
1010753ac610SCharles Manning return ret_val;
1011753ac610SCharles Manning }
1012753ac610SCharles Manning
yaffs_find_del_file_chunk(struct yaffs_obj * in,int inode_chunk,struct yaffs_ext_tags * tags)1013753ac610SCharles Manning static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
1014753ac610SCharles Manning struct yaffs_ext_tags *tags)
1015753ac610SCharles Manning {
1016753ac610SCharles Manning /* Get the Tnode, then get the level 0 offset chunk offset */
1017753ac610SCharles Manning struct yaffs_tnode *tn;
1018753ac610SCharles Manning int the_chunk = -1;
1019753ac610SCharles Manning struct yaffs_ext_tags local_tags;
1020753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev;
1021753ac610SCharles Manning int ret_val = -1;
1022753ac610SCharles Manning
1023753ac610SCharles Manning if (!tags) {
1024753ac610SCharles Manning /* Passed a NULL, so use our own tags space */
1025753ac610SCharles Manning tags = &local_tags;
1026753ac610SCharles Manning }
1027753ac610SCharles Manning
1028753ac610SCharles Manning tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
1029753ac610SCharles Manning
1030753ac610SCharles Manning if (!tn)
1031753ac610SCharles Manning return ret_val;
1032753ac610SCharles Manning
1033753ac610SCharles Manning the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
1034753ac610SCharles Manning
1035753ac610SCharles Manning ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
1036753ac610SCharles Manning inode_chunk);
1037753ac610SCharles Manning
1038753ac610SCharles Manning /* Delete the entry in the filestructure (if found) */
1039753ac610SCharles Manning if (ret_val != -1)
1040753ac610SCharles Manning yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
1041753ac610SCharles Manning
1042753ac610SCharles Manning return ret_val;
1043753ac610SCharles Manning }
1044753ac610SCharles Manning
yaffs_put_chunk_in_file(struct yaffs_obj * in,int inode_chunk,int nand_chunk,int in_scan)1045753ac610SCharles Manning int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
1046753ac610SCharles Manning int nand_chunk, int in_scan)
1047753ac610SCharles Manning {
1048753ac610SCharles Manning /* NB in_scan is zero unless scanning.
1049753ac610SCharles Manning * For forward scanning, in_scan is > 0;
1050753ac610SCharles Manning * for backward scanning in_scan is < 0
1051753ac610SCharles Manning *
1052753ac610SCharles Manning * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
10530e8cc8bdSWilliam Juul */
10540e8cc8bdSWilliam Juul
1055753ac610SCharles Manning struct yaffs_tnode *tn;
1056753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev;
1057753ac610SCharles Manning int existing_cunk;
1058753ac610SCharles Manning struct yaffs_ext_tags existing_tags;
1059753ac610SCharles Manning struct yaffs_ext_tags new_tags;
1060753ac610SCharles Manning unsigned existing_serial, new_serial;
1061753ac610SCharles Manning
1062753ac610SCharles Manning if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
1063753ac610SCharles Manning /* Just ignore an attempt at putting a chunk into a non-file
1064753ac610SCharles Manning * during scanning.
1065753ac610SCharles Manning * If it is not during Scanning then something went wrong!
1066753ac610SCharles Manning */
1067753ac610SCharles Manning if (!in_scan) {
1068753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
1069753ac610SCharles Manning "yaffs tragedy:attempt to put data chunk into a non-file"
1070753ac610SCharles Manning );
1071753ac610SCharles Manning BUG();
1072753ac610SCharles Manning }
1073753ac610SCharles Manning
1074753ac610SCharles Manning yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
1075753ac610SCharles Manning return YAFFS_OK;
1076753ac610SCharles Manning }
1077753ac610SCharles Manning
1078753ac610SCharles Manning tn = yaffs_add_find_tnode_0(dev,
1079753ac610SCharles Manning &in->variant.file_variant,
1080753ac610SCharles Manning inode_chunk, NULL);
1081753ac610SCharles Manning if (!tn)
1082753ac610SCharles Manning return YAFFS_FAIL;
1083753ac610SCharles Manning
1084753ac610SCharles Manning if (!nand_chunk)
1085753ac610SCharles Manning /* Dummy insert, bail now */
1086753ac610SCharles Manning return YAFFS_OK;
1087753ac610SCharles Manning
1088753ac610SCharles Manning existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
1089753ac610SCharles Manning
1090753ac610SCharles Manning if (in_scan != 0) {
1091753ac610SCharles Manning /* If we're scanning then we need to test for duplicates
1092753ac610SCharles Manning * NB This does not need to be efficient since it should only
1093753ac610SCharles Manning * happen when the power fails during a write, then only one
1094753ac610SCharles Manning * chunk should ever be affected.
1095753ac610SCharles Manning *
1096753ac610SCharles Manning * Correction for YAFFS2: This could happen quite a lot and we
1097753ac610SCharles Manning * need to think about efficiency! TODO
1098753ac610SCharles Manning * Update: For backward scanning we don't need to re-read tags
1099753ac610SCharles Manning * so this is quite cheap.
1100753ac610SCharles Manning */
1101753ac610SCharles Manning
1102753ac610SCharles Manning if (existing_cunk > 0) {
1103753ac610SCharles Manning /* NB Right now existing chunk will not be real
1104753ac610SCharles Manning * chunk_id if the chunk group size > 1
1105753ac610SCharles Manning * thus we have to do a FindChunkInFile to get the
1106753ac610SCharles Manning * real chunk id.
1107753ac610SCharles Manning *
1108753ac610SCharles Manning * We have a duplicate now we need to decide which
1109753ac610SCharles Manning * one to use:
1110753ac610SCharles Manning *
1111753ac610SCharles Manning * Backwards scanning YAFFS2: The old one is what
1112753ac610SCharles Manning * we use, dump the new one.
1113753ac610SCharles Manning * YAFFS1: Get both sets of tags and compare serial
1114753ac610SCharles Manning * numbers.
1115753ac610SCharles Manning */
1116753ac610SCharles Manning
1117753ac610SCharles Manning if (in_scan > 0) {
1118753ac610SCharles Manning /* Only do this for forward scanning */
1119753ac610SCharles Manning yaffs_rd_chunk_tags_nand(dev,
1120753ac610SCharles Manning nand_chunk,
1121753ac610SCharles Manning NULL, &new_tags);
1122753ac610SCharles Manning
1123753ac610SCharles Manning /* Do a proper find */
1124753ac610SCharles Manning existing_cunk =
1125753ac610SCharles Manning yaffs_find_chunk_in_file(in, inode_chunk,
1126753ac610SCharles Manning &existing_tags);
1127753ac610SCharles Manning }
1128753ac610SCharles Manning
1129753ac610SCharles Manning if (existing_cunk <= 0) {
1130753ac610SCharles Manning /*Hoosterman - how did this happen? */
1131753ac610SCharles Manning
1132753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
1133753ac610SCharles Manning "yaffs tragedy: existing chunk < 0 in scan"
1134753ac610SCharles Manning );
1135753ac610SCharles Manning
1136753ac610SCharles Manning }
1137753ac610SCharles Manning
1138753ac610SCharles Manning /* NB The deleted flags should be false, otherwise
1139753ac610SCharles Manning * the chunks will not be loaded during a scan
1140753ac610SCharles Manning */
1141753ac610SCharles Manning
1142753ac610SCharles Manning if (in_scan > 0) {
1143753ac610SCharles Manning new_serial = new_tags.serial_number;
1144753ac610SCharles Manning existing_serial = existing_tags.serial_number;
1145753ac610SCharles Manning }
1146753ac610SCharles Manning
1147753ac610SCharles Manning if ((in_scan > 0) &&
1148753ac610SCharles Manning (existing_cunk <= 0 ||
1149753ac610SCharles Manning ((existing_serial + 1) & 3) == new_serial)) {
1150753ac610SCharles Manning /* Forward scanning.
1151753ac610SCharles Manning * Use new
1152753ac610SCharles Manning * Delete the old one and drop through to
1153753ac610SCharles Manning * update the tnode
1154753ac610SCharles Manning */
1155753ac610SCharles Manning yaffs_chunk_del(dev, existing_cunk, 1,
1156753ac610SCharles Manning __LINE__);
1157753ac610SCharles Manning } else {
1158753ac610SCharles Manning /* Backward scanning or we want to use the
1159753ac610SCharles Manning * existing one
1160753ac610SCharles Manning * Delete the new one and return early so that
1161753ac610SCharles Manning * the tnode isn't changed
1162753ac610SCharles Manning */
1163753ac610SCharles Manning yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
1164753ac610SCharles Manning return YAFFS_OK;
1165753ac610SCharles Manning }
1166753ac610SCharles Manning }
1167753ac610SCharles Manning
1168753ac610SCharles Manning }
1169753ac610SCharles Manning
1170753ac610SCharles Manning if (existing_cunk == 0)
1171753ac610SCharles Manning in->n_data_chunks++;
1172753ac610SCharles Manning
1173753ac610SCharles Manning yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
1174753ac610SCharles Manning
1175753ac610SCharles Manning return YAFFS_OK;
1176753ac610SCharles Manning }
1177753ac610SCharles Manning
yaffs_soft_del_chunk(struct yaffs_dev * dev,int chunk)1178753ac610SCharles Manning static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
1179753ac610SCharles Manning {
1180753ac610SCharles Manning struct yaffs_block_info *the_block;
1181753ac610SCharles Manning unsigned block_no;
1182753ac610SCharles Manning
1183753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
1184753ac610SCharles Manning
1185753ac610SCharles Manning block_no = chunk / dev->param.chunks_per_block;
1186753ac610SCharles Manning the_block = yaffs_get_block_info(dev, block_no);
1187753ac610SCharles Manning if (the_block) {
1188753ac610SCharles Manning the_block->soft_del_pages++;
1189753ac610SCharles Manning dev->n_free_chunks++;
1190753ac610SCharles Manning yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
1191753ac610SCharles Manning }
1192753ac610SCharles Manning }
1193753ac610SCharles Manning
1194753ac610SCharles Manning /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
1195753ac610SCharles Manning * the chunks in the file.
1196753ac610SCharles Manning * All soft deleting does is increment the block's softdelete count and pulls
1197753ac610SCharles Manning * the chunk out of the tnode.
1198753ac610SCharles Manning * Thus, essentially this is the same as DeleteWorker except that the chunks
1199753ac610SCharles Manning * are soft deleted.
1200753ac610SCharles Manning */
1201753ac610SCharles Manning
yaffs_soft_del_worker(struct yaffs_obj * in,struct yaffs_tnode * tn,u32 level,int chunk_offset)1202753ac610SCharles Manning static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
1203753ac610SCharles Manning u32 level, int chunk_offset)
12040e8cc8bdSWilliam Juul {
12050e8cc8bdSWilliam Juul int i;
1206753ac610SCharles Manning int the_chunk;
1207753ac610SCharles Manning int all_done = 1;
1208753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev;
12090e8cc8bdSWilliam Juul
1210753ac610SCharles Manning if (!tn)
1211753ac610SCharles Manning return 1;
1212753ac610SCharles Manning
12130e8cc8bdSWilliam Juul if (level > 0) {
1214753ac610SCharles Manning for (i = YAFFS_NTNODES_INTERNAL - 1;
1215753ac610SCharles Manning all_done && i >= 0;
12160e8cc8bdSWilliam Juul i--) {
12170e8cc8bdSWilliam Juul if (tn->internal[i]) {
1218753ac610SCharles Manning all_done =
1219753ac610SCharles Manning yaffs_soft_del_worker(in,
1220753ac610SCharles Manning tn->internal[i],
12210e8cc8bdSWilliam Juul level - 1,
1222753ac610SCharles Manning (chunk_offset <<
12230e8cc8bdSWilliam Juul YAFFS_TNODES_INTERNAL_BITS)
12240e8cc8bdSWilliam Juul + i);
1225753ac610SCharles Manning if (all_done) {
1226753ac610SCharles Manning yaffs_free_tnode(dev,
1227753ac610SCharles Manning tn->internal[i]);
12280e8cc8bdSWilliam Juul tn->internal[i] = NULL;
12290e8cc8bdSWilliam Juul } else {
1230753ac610SCharles Manning /* Can this happen? */
12310e8cc8bdSWilliam Juul }
12320e8cc8bdSWilliam Juul }
12330e8cc8bdSWilliam Juul }
1234753ac610SCharles Manning return (all_done) ? 1 : 0;
1235753ac610SCharles Manning }
12360e8cc8bdSWilliam Juul
1237753ac610SCharles Manning /* level 0 */
12380e8cc8bdSWilliam Juul for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1239753ac610SCharles Manning the_chunk = yaffs_get_group_base(dev, tn, i);
1240753ac610SCharles Manning if (the_chunk) {
1241753ac610SCharles Manning yaffs_soft_del_chunk(dev, the_chunk);
1242753ac610SCharles Manning yaffs_load_tnode_0(dev, tn, i, 0);
12430e8cc8bdSWilliam Juul }
12440e8cc8bdSWilliam Juul }
12450e8cc8bdSWilliam Juul return 1;
12460e8cc8bdSWilliam Juul }
12470e8cc8bdSWilliam Juul
yaffs_remove_obj_from_dir(struct yaffs_obj * obj)1248753ac610SCharles Manning static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
12490e8cc8bdSWilliam Juul {
1250753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev;
1251753ac610SCharles Manning struct yaffs_obj *parent;
1252753ac610SCharles Manning
1253753ac610SCharles Manning yaffs_verify_obj_in_dir(obj);
1254753ac610SCharles Manning parent = obj->parent;
1255753ac610SCharles Manning
1256753ac610SCharles Manning yaffs_verify_dir(parent);
1257753ac610SCharles Manning
1258753ac610SCharles Manning if (dev && dev->param.remove_obj_fn)
1259753ac610SCharles Manning dev->param.remove_obj_fn(obj);
1260753ac610SCharles Manning
1261753ac610SCharles Manning list_del_init(&obj->siblings);
1262753ac610SCharles Manning obj->parent = NULL;
1263753ac610SCharles Manning
1264753ac610SCharles Manning yaffs_verify_dir(parent);
12650e8cc8bdSWilliam Juul }
1266753ac610SCharles Manning
yaffs_add_obj_to_dir(struct yaffs_obj * directory,struct yaffs_obj * obj)1267753ac610SCharles Manning void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
1268753ac610SCharles Manning {
1269753ac610SCharles Manning if (!directory) {
1270753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
1271753ac610SCharles Manning "tragedy: Trying to add an object to a null pointer directory"
1272753ac610SCharles Manning );
1273753ac610SCharles Manning BUG();
1274753ac610SCharles Manning return;
1275753ac610SCharles Manning }
1276753ac610SCharles Manning if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1277753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
1278753ac610SCharles Manning "tragedy: Trying to add an object to a non-directory"
1279753ac610SCharles Manning );
1280753ac610SCharles Manning BUG();
1281753ac610SCharles Manning }
1282753ac610SCharles Manning
1283753ac610SCharles Manning if (obj->siblings.prev == NULL) {
1284753ac610SCharles Manning /* Not initialised */
1285753ac610SCharles Manning BUG();
1286753ac610SCharles Manning }
1287753ac610SCharles Manning
1288753ac610SCharles Manning yaffs_verify_dir(directory);
1289753ac610SCharles Manning
1290753ac610SCharles Manning yaffs_remove_obj_from_dir(obj);
1291753ac610SCharles Manning
1292753ac610SCharles Manning /* Now add it */
1293753ac610SCharles Manning list_add(&obj->siblings, &directory->variant.dir_variant.children);
1294753ac610SCharles Manning obj->parent = directory;
1295753ac610SCharles Manning
1296753ac610SCharles Manning if (directory == obj->my_dev->unlinked_dir
1297753ac610SCharles Manning || directory == obj->my_dev->del_dir) {
1298753ac610SCharles Manning obj->unlinked = 1;
1299753ac610SCharles Manning obj->my_dev->n_unlinked_files++;
1300753ac610SCharles Manning obj->rename_allowed = 0;
1301753ac610SCharles Manning }
1302753ac610SCharles Manning
1303753ac610SCharles Manning yaffs_verify_dir(directory);
1304753ac610SCharles Manning yaffs_verify_obj_in_dir(obj);
1305753ac610SCharles Manning }
1306753ac610SCharles Manning
yaffs_change_obj_name(struct yaffs_obj * obj,struct yaffs_obj * new_dir,const YCHAR * new_name,int force,int shadows)1307753ac610SCharles Manning static int yaffs_change_obj_name(struct yaffs_obj *obj,
1308753ac610SCharles Manning struct yaffs_obj *new_dir,
1309753ac610SCharles Manning const YCHAR *new_name, int force, int shadows)
1310753ac610SCharles Manning {
1311753ac610SCharles Manning int unlink_op;
1312753ac610SCharles Manning int del_op;
1313753ac610SCharles Manning struct yaffs_obj *existing_target;
1314753ac610SCharles Manning
1315753ac610SCharles Manning if (new_dir == NULL)
1316753ac610SCharles Manning new_dir = obj->parent; /* use the old directory */
1317753ac610SCharles Manning
1318753ac610SCharles Manning if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1319753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
1320753ac610SCharles Manning "tragedy: yaffs_change_obj_name: new_dir is not a directory"
1321753ac610SCharles Manning );
1322753ac610SCharles Manning BUG();
1323753ac610SCharles Manning }
1324753ac610SCharles Manning
1325753ac610SCharles Manning unlink_op = (new_dir == obj->my_dev->unlinked_dir);
1326753ac610SCharles Manning del_op = (new_dir == obj->my_dev->del_dir);
1327753ac610SCharles Manning
1328753ac610SCharles Manning existing_target = yaffs_find_by_name(new_dir, new_name);
1329753ac610SCharles Manning
1330753ac610SCharles Manning /* If the object is a file going into the unlinked directory,
1331753ac610SCharles Manning * then it is OK to just stuff it in since duplicate names are OK.
1332753ac610SCharles Manning * else only proceed if the new name does not exist and we're putting
1333753ac610SCharles Manning * it into a directory.
1334753ac610SCharles Manning */
1335753ac610SCharles Manning if (!(unlink_op || del_op || force ||
1336753ac610SCharles Manning shadows > 0 || !existing_target) ||
1337753ac610SCharles Manning new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1338753ac610SCharles Manning return YAFFS_FAIL;
1339753ac610SCharles Manning
1340753ac610SCharles Manning yaffs_set_obj_name(obj, new_name);
1341753ac610SCharles Manning obj->dirty = 1;
1342753ac610SCharles Manning yaffs_add_obj_to_dir(new_dir, obj);
1343753ac610SCharles Manning
1344753ac610SCharles Manning if (unlink_op)
1345753ac610SCharles Manning obj->unlinked = 1;
1346753ac610SCharles Manning
1347753ac610SCharles Manning /* If it is a deletion then we mark it as a shrink for gc */
1348753ac610SCharles Manning if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0)
1349753ac610SCharles Manning return YAFFS_OK;
1350753ac610SCharles Manning
1351753ac610SCharles Manning return YAFFS_FAIL;
1352753ac610SCharles Manning }
1353753ac610SCharles Manning
1354753ac610SCharles Manning /*------------------------ Short Operations Cache ------------------------------
1355753ac610SCharles Manning * In many situations where there is no high level buffering a lot of
1356753ac610SCharles Manning * reads might be short sequential reads, and a lot of writes may be short
1357753ac610SCharles Manning * sequential writes. eg. scanning/writing a jpeg file.
1358753ac610SCharles Manning * In these cases, a short read/write cache can provide a huge perfomance
1359753ac610SCharles Manning * benefit with dumb-as-a-rock code.
1360753ac610SCharles Manning * In Linux, the page cache provides read buffering and the short op cache
1361753ac610SCharles Manning * provides write buffering.
1362753ac610SCharles Manning *
1363753ac610SCharles Manning * There are a small number (~10) of cache chunks per device so that we don't
1364753ac610SCharles Manning * need a very intelligent search.
1365753ac610SCharles Manning */
1366753ac610SCharles Manning
yaffs_obj_cache_dirty(struct yaffs_obj * obj)1367753ac610SCharles Manning static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
1368753ac610SCharles Manning {
1369753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev;
1370753ac610SCharles Manning int i;
1371753ac610SCharles Manning struct yaffs_cache *cache;
1372753ac610SCharles Manning int n_caches = obj->my_dev->param.n_caches;
1373753ac610SCharles Manning
1374753ac610SCharles Manning for (i = 0; i < n_caches; i++) {
1375753ac610SCharles Manning cache = &dev->cache[i];
1376753ac610SCharles Manning if (cache->object == obj && cache->dirty)
1377753ac610SCharles Manning return 1;
1378753ac610SCharles Manning }
1379753ac610SCharles Manning
1380753ac610SCharles Manning return 0;
1381753ac610SCharles Manning }
1382753ac610SCharles Manning
yaffs_flush_file_cache(struct yaffs_obj * obj)1383753ac610SCharles Manning static void yaffs_flush_file_cache(struct yaffs_obj *obj)
1384753ac610SCharles Manning {
1385753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev;
1386753ac610SCharles Manning int lowest = -99; /* Stop compiler whining. */
1387753ac610SCharles Manning int i;
1388753ac610SCharles Manning struct yaffs_cache *cache;
1389753ac610SCharles Manning int chunk_written = 0;
1390753ac610SCharles Manning int n_caches = obj->my_dev->param.n_caches;
1391753ac610SCharles Manning
1392753ac610SCharles Manning if (n_caches < 1)
1393753ac610SCharles Manning return;
1394753ac610SCharles Manning do {
1395753ac610SCharles Manning cache = NULL;
1396753ac610SCharles Manning
1397753ac610SCharles Manning /* Find the lowest dirty chunk for this object */
1398753ac610SCharles Manning for (i = 0; i < n_caches; i++) {
1399753ac610SCharles Manning if (dev->cache[i].object == obj &&
1400753ac610SCharles Manning dev->cache[i].dirty) {
1401753ac610SCharles Manning if (!cache ||
1402753ac610SCharles Manning dev->cache[i].chunk_id < lowest) {
1403753ac610SCharles Manning cache = &dev->cache[i];
1404753ac610SCharles Manning lowest = cache->chunk_id;
1405753ac610SCharles Manning }
1406753ac610SCharles Manning }
1407753ac610SCharles Manning }
1408753ac610SCharles Manning
1409753ac610SCharles Manning if (cache && !cache->locked) {
1410753ac610SCharles Manning /* Write it out and free it up */
1411753ac610SCharles Manning chunk_written =
1412753ac610SCharles Manning yaffs_wr_data_obj(cache->object,
1413753ac610SCharles Manning cache->chunk_id,
1414753ac610SCharles Manning cache->data,
1415753ac610SCharles Manning cache->n_bytes, 1);
1416753ac610SCharles Manning cache->dirty = 0;
1417753ac610SCharles Manning cache->object = NULL;
1418753ac610SCharles Manning }
1419753ac610SCharles Manning } while (cache && chunk_written > 0);
1420753ac610SCharles Manning
1421753ac610SCharles Manning if (cache)
1422753ac610SCharles Manning /* Hoosterman, disk full while writing cache out. */
1423753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
1424753ac610SCharles Manning "yaffs tragedy: no space during cache write");
1425753ac610SCharles Manning }
1426753ac610SCharles Manning
1427753ac610SCharles Manning /*yaffs_flush_whole_cache(dev)
1428753ac610SCharles Manning *
1429753ac610SCharles Manning *
1430753ac610SCharles Manning */
1431753ac610SCharles Manning
yaffs_flush_whole_cache(struct yaffs_dev * dev)1432753ac610SCharles Manning void yaffs_flush_whole_cache(struct yaffs_dev *dev)
1433753ac610SCharles Manning {
1434753ac610SCharles Manning struct yaffs_obj *obj;
1435753ac610SCharles Manning int n_caches = dev->param.n_caches;
1436753ac610SCharles Manning int i;
1437753ac610SCharles Manning
1438753ac610SCharles Manning /* Find a dirty object in the cache and flush it...
1439753ac610SCharles Manning * until there are no further dirty objects.
1440753ac610SCharles Manning */
1441753ac610SCharles Manning do {
1442753ac610SCharles Manning obj = NULL;
1443753ac610SCharles Manning for (i = 0; i < n_caches && !obj; i++) {
1444753ac610SCharles Manning if (dev->cache[i].object && dev->cache[i].dirty)
1445753ac610SCharles Manning obj = dev->cache[i].object;
1446753ac610SCharles Manning }
1447753ac610SCharles Manning if (obj)
1448753ac610SCharles Manning yaffs_flush_file_cache(obj);
1449753ac610SCharles Manning } while (obj);
1450753ac610SCharles Manning
1451753ac610SCharles Manning }
1452753ac610SCharles Manning
1453753ac610SCharles Manning /* Grab us a cache chunk for use.
1454753ac610SCharles Manning * First look for an empty one.
1455753ac610SCharles Manning * Then look for the least recently used non-dirty one.
1456753ac610SCharles Manning * Then look for the least recently used dirty one...., flush and look again.
1457753ac610SCharles Manning */
yaffs_grab_chunk_worker(struct yaffs_dev * dev)1458753ac610SCharles Manning static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
1459753ac610SCharles Manning {
1460753ac610SCharles Manning int i;
1461753ac610SCharles Manning
1462753ac610SCharles Manning if (dev->param.n_caches > 0) {
1463753ac610SCharles Manning for (i = 0; i < dev->param.n_caches; i++) {
1464753ac610SCharles Manning if (!dev->cache[i].object)
1465753ac610SCharles Manning return &dev->cache[i];
1466753ac610SCharles Manning }
1467753ac610SCharles Manning }
1468753ac610SCharles Manning return NULL;
1469753ac610SCharles Manning }
1470753ac610SCharles Manning
yaffs_grab_chunk_cache(struct yaffs_dev * dev)1471753ac610SCharles Manning static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
1472753ac610SCharles Manning {
1473753ac610SCharles Manning struct yaffs_cache *cache;
1474753ac610SCharles Manning struct yaffs_obj *the_obj;
1475753ac610SCharles Manning int usage;
1476753ac610SCharles Manning int i;
1477753ac610SCharles Manning
1478753ac610SCharles Manning if (dev->param.n_caches < 1)
1479753ac610SCharles Manning return NULL;
1480753ac610SCharles Manning
1481753ac610SCharles Manning /* Try find a non-dirty one... */
1482753ac610SCharles Manning
1483753ac610SCharles Manning cache = yaffs_grab_chunk_worker(dev);
1484753ac610SCharles Manning
1485753ac610SCharles Manning if (!cache) {
1486753ac610SCharles Manning /* They were all dirty, find the LRU object and flush
1487753ac610SCharles Manning * its cache, then find again.
1488753ac610SCharles Manning * NB what's here is not very accurate,
1489753ac610SCharles Manning * we actually flush the object with the LRU chunk.
1490753ac610SCharles Manning */
1491753ac610SCharles Manning
1492753ac610SCharles Manning /* With locking we can't assume we can use entry zero,
1493753ac610SCharles Manning * Set the_obj to a valid pointer for Coverity. */
1494753ac610SCharles Manning the_obj = dev->cache[0].object;
1495753ac610SCharles Manning usage = -1;
1496753ac610SCharles Manning cache = NULL;
1497753ac610SCharles Manning
1498753ac610SCharles Manning for (i = 0; i < dev->param.n_caches; i++) {
1499753ac610SCharles Manning if (dev->cache[i].object &&
1500753ac610SCharles Manning !dev->cache[i].locked &&
1501753ac610SCharles Manning (dev->cache[i].last_use < usage ||
1502753ac610SCharles Manning !cache)) {
1503753ac610SCharles Manning usage = dev->cache[i].last_use;
1504753ac610SCharles Manning the_obj = dev->cache[i].object;
1505753ac610SCharles Manning cache = &dev->cache[i];
1506753ac610SCharles Manning }
1507753ac610SCharles Manning }
1508753ac610SCharles Manning
1509753ac610SCharles Manning if (!cache || cache->dirty) {
1510753ac610SCharles Manning /* Flush and try again */
1511753ac610SCharles Manning yaffs_flush_file_cache(the_obj);
1512753ac610SCharles Manning cache = yaffs_grab_chunk_worker(dev);
1513753ac610SCharles Manning }
1514753ac610SCharles Manning }
1515753ac610SCharles Manning return cache;
1516753ac610SCharles Manning }
1517753ac610SCharles Manning
1518753ac610SCharles Manning /* Find a cached chunk */
yaffs_find_chunk_cache(const struct yaffs_obj * obj,int chunk_id)1519753ac610SCharles Manning static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
1520753ac610SCharles Manning int chunk_id)
1521753ac610SCharles Manning {
1522753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev;
1523753ac610SCharles Manning int i;
1524753ac610SCharles Manning
1525753ac610SCharles Manning if (dev->param.n_caches < 1)
1526753ac610SCharles Manning return NULL;
1527753ac610SCharles Manning
1528753ac610SCharles Manning for (i = 0; i < dev->param.n_caches; i++) {
1529753ac610SCharles Manning if (dev->cache[i].object == obj &&
1530753ac610SCharles Manning dev->cache[i].chunk_id == chunk_id) {
1531753ac610SCharles Manning dev->cache_hits++;
1532753ac610SCharles Manning
1533753ac610SCharles Manning return &dev->cache[i];
1534753ac610SCharles Manning }
1535753ac610SCharles Manning }
1536753ac610SCharles Manning return NULL;
1537753ac610SCharles Manning }
1538753ac610SCharles Manning
1539753ac610SCharles Manning /* Mark the chunk for the least recently used algorithym */
yaffs_use_cache(struct yaffs_dev * dev,struct yaffs_cache * cache,int is_write)1540753ac610SCharles Manning static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
1541753ac610SCharles Manning int is_write)
1542753ac610SCharles Manning {
1543753ac610SCharles Manning int i;
1544753ac610SCharles Manning
1545753ac610SCharles Manning if (dev->param.n_caches < 1)
1546753ac610SCharles Manning return;
1547753ac610SCharles Manning
1548753ac610SCharles Manning if (dev->cache_last_use < 0 ||
1549753ac610SCharles Manning dev->cache_last_use > 100000000) {
1550753ac610SCharles Manning /* Reset the cache usages */
1551753ac610SCharles Manning for (i = 1; i < dev->param.n_caches; i++)
1552753ac610SCharles Manning dev->cache[i].last_use = 0;
1553753ac610SCharles Manning
1554753ac610SCharles Manning dev->cache_last_use = 0;
1555753ac610SCharles Manning }
1556753ac610SCharles Manning dev->cache_last_use++;
1557753ac610SCharles Manning cache->last_use = dev->cache_last_use;
1558753ac610SCharles Manning
1559753ac610SCharles Manning if (is_write)
1560753ac610SCharles Manning cache->dirty = 1;
1561753ac610SCharles Manning }
1562753ac610SCharles Manning
1563753ac610SCharles Manning /* Invalidate a single cache page.
1564753ac610SCharles Manning * Do this when a whole page gets written,
1565753ac610SCharles Manning * ie the short cache for this page is no longer valid.
1566753ac610SCharles Manning */
yaffs_invalidate_chunk_cache(struct yaffs_obj * object,int chunk_id)1567753ac610SCharles Manning static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
1568753ac610SCharles Manning {
1569753ac610SCharles Manning struct yaffs_cache *cache;
1570753ac610SCharles Manning
1571753ac610SCharles Manning if (object->my_dev->param.n_caches > 0) {
1572753ac610SCharles Manning cache = yaffs_find_chunk_cache(object, chunk_id);
1573753ac610SCharles Manning
1574753ac610SCharles Manning if (cache)
1575753ac610SCharles Manning cache->object = NULL;
1576753ac610SCharles Manning }
1577753ac610SCharles Manning }
1578753ac610SCharles Manning
1579753ac610SCharles Manning /* Invalidate all the cache pages associated with this object
1580753ac610SCharles Manning * Do this whenever ther file is deleted or resized.
1581753ac610SCharles Manning */
yaffs_invalidate_whole_cache(struct yaffs_obj * in)1582753ac610SCharles Manning static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
1583753ac610SCharles Manning {
1584753ac610SCharles Manning int i;
1585753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev;
1586753ac610SCharles Manning
1587753ac610SCharles Manning if (dev->param.n_caches > 0) {
1588753ac610SCharles Manning /* Invalidate it. */
1589753ac610SCharles Manning for (i = 0; i < dev->param.n_caches; i++) {
1590753ac610SCharles Manning if (dev->cache[i].object == in)
1591753ac610SCharles Manning dev->cache[i].object = NULL;
1592753ac610SCharles Manning }
1593753ac610SCharles Manning }
1594753ac610SCharles Manning }
1595753ac610SCharles Manning
yaffs_unhash_obj(struct yaffs_obj * obj)1596753ac610SCharles Manning static void yaffs_unhash_obj(struct yaffs_obj *obj)
1597753ac610SCharles Manning {
1598753ac610SCharles Manning int bucket;
1599753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev;
1600753ac610SCharles Manning
1601753ac610SCharles Manning /* If it is still linked into the bucket list, free from the list */
1602753ac610SCharles Manning if (!list_empty(&obj->hash_link)) {
1603753ac610SCharles Manning list_del_init(&obj->hash_link);
1604753ac610SCharles Manning bucket = yaffs_hash_fn(obj->obj_id);
1605753ac610SCharles Manning dev->obj_bucket[bucket].count--;
1606753ac610SCharles Manning }
1607753ac610SCharles Manning }
1608753ac610SCharles Manning
1609753ac610SCharles Manning /* FreeObject frees up a Object and puts it back on the free list */
yaffs_free_obj(struct yaffs_obj * obj)1610753ac610SCharles Manning static void yaffs_free_obj(struct yaffs_obj *obj)
1611753ac610SCharles Manning {
1612753ac610SCharles Manning struct yaffs_dev *dev;
1613753ac610SCharles Manning
1614753ac610SCharles Manning if (!obj) {
1615753ac610SCharles Manning BUG();
1616753ac610SCharles Manning return;
1617753ac610SCharles Manning }
1618753ac610SCharles Manning dev = obj->my_dev;
1619753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
1620753ac610SCharles Manning obj, obj->my_inode);
1621753ac610SCharles Manning if (obj->parent)
1622753ac610SCharles Manning BUG();
1623753ac610SCharles Manning if (!list_empty(&obj->siblings))
1624753ac610SCharles Manning BUG();
1625753ac610SCharles Manning
1626753ac610SCharles Manning if (obj->my_inode) {
1627753ac610SCharles Manning /* We're still hooked up to a cached inode.
1628753ac610SCharles Manning * Don't delete now, but mark for later deletion
1629753ac610SCharles Manning */
1630753ac610SCharles Manning obj->defered_free = 1;
1631753ac610SCharles Manning return;
1632753ac610SCharles Manning }
1633753ac610SCharles Manning
1634753ac610SCharles Manning yaffs_unhash_obj(obj);
1635753ac610SCharles Manning
1636753ac610SCharles Manning yaffs_free_raw_obj(dev, obj);
1637753ac610SCharles Manning dev->n_obj--;
1638753ac610SCharles Manning dev->checkpoint_blocks_required = 0; /* force recalculation */
1639753ac610SCharles Manning }
1640753ac610SCharles Manning
yaffs_handle_defered_free(struct yaffs_obj * obj)1641753ac610SCharles Manning void yaffs_handle_defered_free(struct yaffs_obj *obj)
1642753ac610SCharles Manning {
1643753ac610SCharles Manning if (obj->defered_free)
1644753ac610SCharles Manning yaffs_free_obj(obj);
1645753ac610SCharles Manning }
1646753ac610SCharles Manning
yaffs_generic_obj_del(struct yaffs_obj * in)1647753ac610SCharles Manning static int yaffs_generic_obj_del(struct yaffs_obj *in)
1648753ac610SCharles Manning {
1649753ac610SCharles Manning /* Iinvalidate the file's data in the cache, without flushing. */
1650753ac610SCharles Manning yaffs_invalidate_whole_cache(in);
1651753ac610SCharles Manning
1652753ac610SCharles Manning if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) {
1653753ac610SCharles Manning /* Move to unlinked directory so we have a deletion record */
1654753ac610SCharles Manning yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
1655753ac610SCharles Manning 0);
1656753ac610SCharles Manning }
1657753ac610SCharles Manning
1658753ac610SCharles Manning yaffs_remove_obj_from_dir(in);
1659753ac610SCharles Manning yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
1660753ac610SCharles Manning in->hdr_chunk = 0;
1661753ac610SCharles Manning
1662753ac610SCharles Manning yaffs_free_obj(in);
1663753ac610SCharles Manning return YAFFS_OK;
1664753ac610SCharles Manning
1665753ac610SCharles Manning }
1666753ac610SCharles Manning
yaffs_soft_del_file(struct yaffs_obj * obj)1667753ac610SCharles Manning static void yaffs_soft_del_file(struct yaffs_obj *obj)
1668753ac610SCharles Manning {
1669753ac610SCharles Manning if (!obj->deleted ||
1670753ac610SCharles Manning obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
1671753ac610SCharles Manning obj->soft_del)
1672753ac610SCharles Manning return;
1673753ac610SCharles Manning
1674753ac610SCharles Manning if (obj->n_data_chunks <= 0) {
1675753ac610SCharles Manning /* Empty file with no duplicate object headers,
1676753ac610SCharles Manning * just delete it immediately */
1677753ac610SCharles Manning yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
1678753ac610SCharles Manning obj->variant.file_variant.top = NULL;
1679753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING,
1680753ac610SCharles Manning "yaffs: Deleting empty file %d",
1681753ac610SCharles Manning obj->obj_id);
1682753ac610SCharles Manning yaffs_generic_obj_del(obj);
1683753ac610SCharles Manning } else {
1684753ac610SCharles Manning yaffs_soft_del_worker(obj,
1685753ac610SCharles Manning obj->variant.file_variant.top,
1686753ac610SCharles Manning obj->variant.
1687753ac610SCharles Manning file_variant.top_level, 0);
1688753ac610SCharles Manning obj->soft_del = 1;
16890e8cc8bdSWilliam Juul }
16900e8cc8bdSWilliam Juul }
16910e8cc8bdSWilliam Juul
16920e8cc8bdSWilliam Juul /* Pruning removes any part of the file structure tree that is beyond the
16930e8cc8bdSWilliam Juul * bounds of the file (ie that does not point to chunks).
16940e8cc8bdSWilliam Juul *
16950e8cc8bdSWilliam Juul * A file should only get pruned when its size is reduced.
16960e8cc8bdSWilliam Juul *
16970e8cc8bdSWilliam Juul * Before pruning, the chunks must be pulled from the tree and the
16980e8cc8bdSWilliam Juul * level 0 tnode entries must be zeroed out.
16990e8cc8bdSWilliam Juul * Could also use this for file deletion, but that's probably better handled
17000e8cc8bdSWilliam Juul * by a special case.
1701753ac610SCharles Manning *
1702753ac610SCharles Manning * This function is recursive. For levels > 0 the function is called again on
1703753ac610SCharles Manning * any sub-tree. For level == 0 we just check if the sub-tree has data.
1704753ac610SCharles Manning * If there is no data in a subtree then it is pruned.
17050e8cc8bdSWilliam Juul */
17060e8cc8bdSWilliam Juul
yaffs_prune_worker(struct yaffs_dev * dev,struct yaffs_tnode * tn,u32 level,int del0)1707753ac610SCharles Manning static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
1708753ac610SCharles Manning struct yaffs_tnode *tn, u32 level,
1709753ac610SCharles Manning int del0)
17100e8cc8bdSWilliam Juul {
17110e8cc8bdSWilliam Juul int i;
1712753ac610SCharles Manning int has_data;
17130e8cc8bdSWilliam Juul
1714753ac610SCharles Manning if (!tn)
1715753ac610SCharles Manning return tn;
17160e8cc8bdSWilliam Juul
1717753ac610SCharles Manning has_data = 0;
1718753ac610SCharles Manning
1719753ac610SCharles Manning if (level > 0) {
17200e8cc8bdSWilliam Juul for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1721753ac610SCharles Manning if (tn->internal[i]) {
17220e8cc8bdSWilliam Juul tn->internal[i] =
1723753ac610SCharles Manning yaffs_prune_worker(dev,
1724753ac610SCharles Manning tn->internal[i],
17250e8cc8bdSWilliam Juul level - 1,
17260e8cc8bdSWilliam Juul (i == 0) ? del0 : 1);
17270e8cc8bdSWilliam Juul }
17280e8cc8bdSWilliam Juul
1729753ac610SCharles Manning if (tn->internal[i])
1730753ac610SCharles Manning has_data++;
1731753ac610SCharles Manning }
1732753ac610SCharles Manning } else {
1733753ac610SCharles Manning int tnode_size_u32 = dev->tnode_size / sizeof(u32);
1734753ac610SCharles Manning u32 *map = (u32 *) tn;
1735753ac610SCharles Manning
1736753ac610SCharles Manning for (i = 0; !has_data && i < tnode_size_u32; i++) {
1737753ac610SCharles Manning if (map[i])
1738753ac610SCharles Manning has_data++;
17390e8cc8bdSWilliam Juul }
17400e8cc8bdSWilliam Juul }
17410e8cc8bdSWilliam Juul
1742753ac610SCharles Manning if (has_data == 0 && del0) {
17430e8cc8bdSWilliam Juul /* Free and return NULL */
1744753ac610SCharles Manning yaffs_free_tnode(dev, tn);
17450e8cc8bdSWilliam Juul tn = NULL;
17460e8cc8bdSWilliam Juul }
17470e8cc8bdSWilliam Juul return tn;
17480e8cc8bdSWilliam Juul }
17490e8cc8bdSWilliam Juul
yaffs_prune_tree(struct yaffs_dev * dev,struct yaffs_file_var * file_struct)1750753ac610SCharles Manning static int yaffs_prune_tree(struct yaffs_dev *dev,
1751753ac610SCharles Manning struct yaffs_file_var *file_struct)
17520e8cc8bdSWilliam Juul {
17530e8cc8bdSWilliam Juul int i;
1754753ac610SCharles Manning int has_data;
17550e8cc8bdSWilliam Juul int done = 0;
1756753ac610SCharles Manning struct yaffs_tnode *tn;
17570e8cc8bdSWilliam Juul
1758753ac610SCharles Manning if (file_struct->top_level < 1)
1759753ac610SCharles Manning return YAFFS_OK;
17600e8cc8bdSWilliam Juul
1761753ac610SCharles Manning file_struct->top =
1762753ac610SCharles Manning yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
1763753ac610SCharles Manning
1764753ac610SCharles Manning /* Now we have a tree with all the non-zero branches NULL but
1765753ac610SCharles Manning * the height is the same as it was.
17660e8cc8bdSWilliam Juul * Let's see if we can trim internal tnodes to shorten the tree.
17670e8cc8bdSWilliam Juul * We can do this if only the 0th element in the tnode is in use
17680e8cc8bdSWilliam Juul * (ie all the non-zero are NULL)
17690e8cc8bdSWilliam Juul */
17700e8cc8bdSWilliam Juul
1771753ac610SCharles Manning while (file_struct->top_level && !done) {
1772753ac610SCharles Manning tn = file_struct->top;
17730e8cc8bdSWilliam Juul
1774753ac610SCharles Manning has_data = 0;
17750e8cc8bdSWilliam Juul for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1776753ac610SCharles Manning if (tn->internal[i])
1777753ac610SCharles Manning has_data++;
17780e8cc8bdSWilliam Juul }
17790e8cc8bdSWilliam Juul
1780753ac610SCharles Manning if (!has_data) {
1781753ac610SCharles Manning file_struct->top = tn->internal[0];
1782753ac610SCharles Manning file_struct->top_level--;
1783753ac610SCharles Manning yaffs_free_tnode(dev, tn);
17840e8cc8bdSWilliam Juul } else {
17850e8cc8bdSWilliam Juul done = 1;
17860e8cc8bdSWilliam Juul }
17870e8cc8bdSWilliam Juul }
17880e8cc8bdSWilliam Juul
17890e8cc8bdSWilliam Juul return YAFFS_OK;
17900e8cc8bdSWilliam Juul }
17910e8cc8bdSWilliam Juul
17920e8cc8bdSWilliam Juul /*-------------------- End of File Structure functions.-------------------*/
17930e8cc8bdSWilliam Juul
1794753ac610SCharles Manning /* alloc_empty_obj gets us a clean Object.*/
yaffs_alloc_empty_obj(struct yaffs_dev * dev)1795753ac610SCharles Manning static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
17960e8cc8bdSWilliam Juul {
1797753ac610SCharles Manning struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
17980e8cc8bdSWilliam Juul
1799753ac610SCharles Manning if (!obj)
1800753ac610SCharles Manning return obj;
18010e8cc8bdSWilliam Juul
1802753ac610SCharles Manning dev->n_obj++;
18030e8cc8bdSWilliam Juul
18040e8cc8bdSWilliam Juul /* Now sweeten it up... */
18050e8cc8bdSWilliam Juul
1806753ac610SCharles Manning memset(obj, 0, sizeof(struct yaffs_obj));
1807753ac610SCharles Manning obj->being_created = 1;
1808753ac610SCharles Manning
1809753ac610SCharles Manning obj->my_dev = dev;
1810753ac610SCharles Manning obj->hdr_chunk = 0;
1811753ac610SCharles Manning obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
1812753ac610SCharles Manning INIT_LIST_HEAD(&(obj->hard_links));
1813753ac610SCharles Manning INIT_LIST_HEAD(&(obj->hash_link));
1814753ac610SCharles Manning INIT_LIST_HEAD(&obj->siblings);
1815753ac610SCharles Manning
1816753ac610SCharles Manning /* Now make the directory sane */
1817753ac610SCharles Manning if (dev->root_dir) {
1818753ac610SCharles Manning obj->parent = dev->root_dir;
1819753ac610SCharles Manning list_add(&(obj->siblings),
1820753ac610SCharles Manning &dev->root_dir->variant.dir_variant.children);
1821753ac610SCharles Manning }
18220e8cc8bdSWilliam Juul
18230e8cc8bdSWilliam Juul /* Add it to the lost and found directory.
1824753ac610SCharles Manning * NB Can't put root or lost-n-found in lost-n-found so
1825753ac610SCharles Manning * check if lost-n-found exists first
18260e8cc8bdSWilliam Juul */
1827753ac610SCharles Manning if (dev->lost_n_found)
1828753ac610SCharles Manning yaffs_add_obj_to_dir(dev->lost_n_found, obj);
18290e8cc8bdSWilliam Juul
1830753ac610SCharles Manning obj->being_created = 0;
18310e8cc8bdSWilliam Juul
1832753ac610SCharles Manning dev->checkpoint_blocks_required = 0; /* force recalculation */
18330e8cc8bdSWilliam Juul
18340e8cc8bdSWilliam Juul return obj;
18350e8cc8bdSWilliam Juul }
18360e8cc8bdSWilliam Juul
yaffs_find_nice_bucket(struct yaffs_dev * dev)1837753ac610SCharles Manning static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
18380e8cc8bdSWilliam Juul {
18390e8cc8bdSWilliam Juul int i;
18400e8cc8bdSWilliam Juul int l = 999;
18410e8cc8bdSWilliam Juul int lowest = 999999;
18420e8cc8bdSWilliam Juul
1843753ac610SCharles Manning /* Search for the shortest list or one that
1844753ac610SCharles Manning * isn't too long.
18450e8cc8bdSWilliam Juul */
18460e8cc8bdSWilliam Juul
1847753ac610SCharles Manning for (i = 0; i < 10 && lowest > 4; i++) {
1848753ac610SCharles Manning dev->bucket_finder++;
1849753ac610SCharles Manning dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
1850753ac610SCharles Manning if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
1851753ac610SCharles Manning lowest = dev->obj_bucket[dev->bucket_finder].count;
1852753ac610SCharles Manning l = dev->bucket_finder;
18530e8cc8bdSWilliam Juul }
18540e8cc8bdSWilliam Juul }
18550e8cc8bdSWilliam Juul
18560e8cc8bdSWilliam Juul return l;
18570e8cc8bdSWilliam Juul }
18580e8cc8bdSWilliam Juul
yaffs_new_obj_id(struct yaffs_dev * dev)1859753ac610SCharles Manning static int yaffs_new_obj_id(struct yaffs_dev *dev)
18600e8cc8bdSWilliam Juul {
1861753ac610SCharles Manning int bucket = yaffs_find_nice_bucket(dev);
1862753ac610SCharles Manning int found = 0;
1863753ac610SCharles Manning struct list_head *i;
1864753ac610SCharles Manning u32 n = (u32) bucket;
18650e8cc8bdSWilliam Juul
18660e8cc8bdSWilliam Juul /* Now find an object value that has not already been taken
18670e8cc8bdSWilliam Juul * by scanning the list.
18680e8cc8bdSWilliam Juul */
18690e8cc8bdSWilliam Juul
18700e8cc8bdSWilliam Juul while (!found) {
18710e8cc8bdSWilliam Juul found = 1;
18720e8cc8bdSWilliam Juul n += YAFFS_NOBJECT_BUCKETS;
1873753ac610SCharles Manning list_for_each(i, &dev->obj_bucket[bucket].list) {
18740e8cc8bdSWilliam Juul /* If there is already one in the list */
1875*428e60e0SHeinrich Schuchardt if (list_entry(i, struct yaffs_obj,
1876753ac610SCharles Manning hash_link)->obj_id == n) {
18770e8cc8bdSWilliam Juul found = 0;
187876df275cSHeinrich Schuchardt break;
18790e8cc8bdSWilliam Juul }
18800e8cc8bdSWilliam Juul }
18810e8cc8bdSWilliam Juul }
18820e8cc8bdSWilliam Juul return n;
18830e8cc8bdSWilliam Juul }
18840e8cc8bdSWilliam Juul
yaffs_hash_obj(struct yaffs_obj * in)1885753ac610SCharles Manning static void yaffs_hash_obj(struct yaffs_obj *in)
18860e8cc8bdSWilliam Juul {
1887753ac610SCharles Manning int bucket = yaffs_hash_fn(in->obj_id);
1888753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev;
18890e8cc8bdSWilliam Juul
1890753ac610SCharles Manning list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
1891753ac610SCharles Manning dev->obj_bucket[bucket].count++;
18920e8cc8bdSWilliam Juul }
18930e8cc8bdSWilliam Juul
yaffs_find_by_number(struct yaffs_dev * dev,u32 number)1894753ac610SCharles Manning struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
18950e8cc8bdSWilliam Juul {
1896753ac610SCharles Manning int bucket = yaffs_hash_fn(number);
18970e8cc8bdSWilliam Juul struct list_head *i;
1898753ac610SCharles Manning struct yaffs_obj *in;
18990e8cc8bdSWilliam Juul
1900753ac610SCharles Manning list_for_each(i, &dev->obj_bucket[bucket].list) {
19010e8cc8bdSWilliam Juul /* Look if it is in the list */
1902753ac610SCharles Manning in = list_entry(i, struct yaffs_obj, hash_link);
1903753ac610SCharles Manning if (in->obj_id == number) {
1904753ac610SCharles Manning /* Don't show if it is defered free */
1905753ac610SCharles Manning if (in->defered_free)
19060e8cc8bdSWilliam Juul return NULL;
19070e8cc8bdSWilliam Juul return in;
19080e8cc8bdSWilliam Juul }
19090e8cc8bdSWilliam Juul }
19100e8cc8bdSWilliam Juul
19110e8cc8bdSWilliam Juul return NULL;
19120e8cc8bdSWilliam Juul }
19130e8cc8bdSWilliam Juul
yaffs_new_obj(struct yaffs_dev * dev,int number,enum yaffs_obj_type type)1914753ac610SCharles Manning struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
1915753ac610SCharles Manning enum yaffs_obj_type type)
19160e8cc8bdSWilliam Juul {
1917753ac610SCharles Manning struct yaffs_obj *the_obj = NULL;
1918753ac610SCharles Manning struct yaffs_tnode *tn = NULL;
19190e8cc8bdSWilliam Juul
1920753ac610SCharles Manning if (number < 0)
1921753ac610SCharles Manning number = yaffs_new_obj_id(dev);
19220e8cc8bdSWilliam Juul
19230e8cc8bdSWilliam Juul if (type == YAFFS_OBJECT_TYPE_FILE) {
1924753ac610SCharles Manning tn = yaffs_get_tnode(dev);
1925753ac610SCharles Manning if (!tn)
19260e8cc8bdSWilliam Juul return NULL;
19270e8cc8bdSWilliam Juul }
1928753ac610SCharles Manning
1929753ac610SCharles Manning the_obj = yaffs_alloc_empty_obj(dev);
1930753ac610SCharles Manning if (!the_obj) {
1931753ac610SCharles Manning if (tn)
1932753ac610SCharles Manning yaffs_free_tnode(dev, tn);
1933753ac610SCharles Manning return NULL;
19340e8cc8bdSWilliam Juul }
19350e8cc8bdSWilliam Juul
1936753ac610SCharles Manning the_obj->fake = 0;
1937753ac610SCharles Manning the_obj->rename_allowed = 1;
1938753ac610SCharles Manning the_obj->unlink_allowed = 1;
1939753ac610SCharles Manning the_obj->obj_id = number;
1940753ac610SCharles Manning yaffs_hash_obj(the_obj);
1941753ac610SCharles Manning the_obj->variant_type = type;
1942753ac610SCharles Manning yaffs_load_current_time(the_obj, 1, 1);
19430e8cc8bdSWilliam Juul
19440e8cc8bdSWilliam Juul switch (type) {
19450e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_FILE:
1946753ac610SCharles Manning the_obj->variant.file_variant.file_size = 0;
1947753ac610SCharles Manning the_obj->variant.file_variant.scanned_size = 0;
1948753ac610SCharles Manning the_obj->variant.file_variant.shrink_size =
1949753ac610SCharles Manning yaffs_max_file_size(dev);
1950753ac610SCharles Manning the_obj->variant.file_variant.top_level = 0;
1951753ac610SCharles Manning the_obj->variant.file_variant.top = tn;
19520e8cc8bdSWilliam Juul break;
19530e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_DIRECTORY:
1954753ac610SCharles Manning INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
1955753ac610SCharles Manning INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
19560e8cc8bdSWilliam Juul break;
19570e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SYMLINK:
19580e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_HARDLINK:
19590e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SPECIAL:
19600e8cc8bdSWilliam Juul /* No action required */
19610e8cc8bdSWilliam Juul break;
19620e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_UNKNOWN:
19630e8cc8bdSWilliam Juul /* todo this should not happen */
19640e8cc8bdSWilliam Juul break;
19650e8cc8bdSWilliam Juul }
1966753ac610SCharles Manning return the_obj;
19670e8cc8bdSWilliam Juul }
19680e8cc8bdSWilliam Juul
yaffs_create_fake_dir(struct yaffs_dev * dev,int number,u32 mode)1969753ac610SCharles Manning static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
1970753ac610SCharles Manning int number, u32 mode)
1971753ac610SCharles Manning {
1972753ac610SCharles Manning
1973753ac610SCharles Manning struct yaffs_obj *obj =
1974753ac610SCharles Manning yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1975753ac610SCharles Manning
1976753ac610SCharles Manning if (!obj)
1977753ac610SCharles Manning return NULL;
1978753ac610SCharles Manning
1979753ac610SCharles Manning obj->fake = 1; /* it is fake so it might not use NAND */
1980753ac610SCharles Manning obj->rename_allowed = 0;
1981753ac610SCharles Manning obj->unlink_allowed = 0;
1982753ac610SCharles Manning obj->deleted = 0;
1983753ac610SCharles Manning obj->unlinked = 0;
1984753ac610SCharles Manning obj->yst_mode = mode;
1985753ac610SCharles Manning obj->my_dev = dev;
1986753ac610SCharles Manning obj->hdr_chunk = 0; /* Not a valid chunk. */
1987753ac610SCharles Manning return obj;
1988753ac610SCharles Manning
19890e8cc8bdSWilliam Juul }
19900e8cc8bdSWilliam Juul
1991753ac610SCharles Manning
yaffs_init_tnodes_and_objs(struct yaffs_dev * dev)1992753ac610SCharles Manning static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
1993753ac610SCharles Manning {
1994753ac610SCharles Manning int i;
1995753ac610SCharles Manning
1996753ac610SCharles Manning dev->n_obj = 0;
1997753ac610SCharles Manning dev->n_tnodes = 0;
1998753ac610SCharles Manning yaffs_init_raw_tnodes_and_objs(dev);
1999753ac610SCharles Manning
2000753ac610SCharles Manning for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2001753ac610SCharles Manning INIT_LIST_HEAD(&dev->obj_bucket[i].list);
2002753ac610SCharles Manning dev->obj_bucket[i].count = 0;
2003753ac610SCharles Manning }
2004753ac610SCharles Manning }
2005753ac610SCharles Manning
yaffs_find_or_create_by_number(struct yaffs_dev * dev,int number,enum yaffs_obj_type type)2006753ac610SCharles Manning struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
20070e8cc8bdSWilliam Juul int number,
2008753ac610SCharles Manning enum yaffs_obj_type type)
20090e8cc8bdSWilliam Juul {
2010753ac610SCharles Manning struct yaffs_obj *the_obj = NULL;
20110e8cc8bdSWilliam Juul
2012753ac610SCharles Manning if (number > 0)
2013753ac610SCharles Manning the_obj = yaffs_find_by_number(dev, number);
20140e8cc8bdSWilliam Juul
2015753ac610SCharles Manning if (!the_obj)
2016753ac610SCharles Manning the_obj = yaffs_new_obj(dev, number, type);
20170e8cc8bdSWilliam Juul
2018753ac610SCharles Manning return the_obj;
20190e8cc8bdSWilliam Juul
20200e8cc8bdSWilliam Juul }
20210e8cc8bdSWilliam Juul
yaffs_clone_str(const YCHAR * str)2022753ac610SCharles Manning YCHAR *yaffs_clone_str(const YCHAR *str)
20230e8cc8bdSWilliam Juul {
2024753ac610SCharles Manning YCHAR *new_str = NULL;
2025753ac610SCharles Manning int len;
20260e8cc8bdSWilliam Juul
2027753ac610SCharles Manning if (!str)
2028753ac610SCharles Manning str = _Y("");
2029753ac610SCharles Manning
2030753ac610SCharles Manning len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
2031753ac610SCharles Manning new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
2032753ac610SCharles Manning if (new_str) {
2033753ac610SCharles Manning yaffs_strncpy(new_str, str, len);
2034753ac610SCharles Manning new_str[len] = 0;
2035753ac610SCharles Manning }
2036753ac610SCharles Manning return new_str;
2037753ac610SCharles Manning
2038753ac610SCharles Manning }
2039753ac610SCharles Manning /*
2040753ac610SCharles Manning *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
2041753ac610SCharles Manning * link (ie. name) is created or deleted in the directory.
2042753ac610SCharles Manning *
2043753ac610SCharles Manning * ie.
2044753ac610SCharles Manning * create dir/a : update dir's mtime/ctime
2045753ac610SCharles Manning * rm dir/a: update dir's mtime/ctime
2046753ac610SCharles Manning * modify dir/a: don't update dir's mtimme/ctime
2047753ac610SCharles Manning *
2048753ac610SCharles Manning * This can be handled immediately or defered. Defering helps reduce the number
2049753ac610SCharles Manning * of updates when many files in a directory are changed within a brief period.
2050753ac610SCharles Manning *
2051753ac610SCharles Manning * If the directory updating is defered then yaffs_update_dirty_dirs must be
2052753ac610SCharles Manning * called periodically.
2053753ac610SCharles Manning */
2054753ac610SCharles Manning
yaffs_update_parent(struct yaffs_obj * obj)2055753ac610SCharles Manning static void yaffs_update_parent(struct yaffs_obj *obj)
2056753ac610SCharles Manning {
2057753ac610SCharles Manning struct yaffs_dev *dev;
2058753ac610SCharles Manning
2059753ac610SCharles Manning if (!obj)
2060753ac610SCharles Manning return;
2061753ac610SCharles Manning dev = obj->my_dev;
2062753ac610SCharles Manning obj->dirty = 1;
2063753ac610SCharles Manning yaffs_load_current_time(obj, 0, 1);
2064753ac610SCharles Manning if (dev->param.defered_dir_update) {
2065753ac610SCharles Manning struct list_head *link = &obj->variant.dir_variant.dirty;
2066753ac610SCharles Manning
2067753ac610SCharles Manning if (list_empty(link)) {
2068753ac610SCharles Manning list_add(link, &dev->dirty_dirs);
2069753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_BACKGROUND,
2070753ac610SCharles Manning "Added object %d to dirty directories",
2071753ac610SCharles Manning obj->obj_id);
20720e8cc8bdSWilliam Juul }
20730e8cc8bdSWilliam Juul
2074753ac610SCharles Manning } else {
2075753ac610SCharles Manning yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
2076753ac610SCharles Manning }
2077753ac610SCharles Manning }
20780e8cc8bdSWilliam Juul
yaffs_update_dirty_dirs(struct yaffs_dev * dev)2079753ac610SCharles Manning void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
2080753ac610SCharles Manning {
2081753ac610SCharles Manning struct list_head *link;
2082753ac610SCharles Manning struct yaffs_obj *obj;
2083753ac610SCharles Manning struct yaffs_dir_var *d_s;
2084753ac610SCharles Manning union yaffs_obj_var *o_v;
2085753ac610SCharles Manning
2086753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
2087753ac610SCharles Manning
2088753ac610SCharles Manning while (!list_empty(&dev->dirty_dirs)) {
2089753ac610SCharles Manning link = dev->dirty_dirs.next;
2090753ac610SCharles Manning list_del_init(link);
2091753ac610SCharles Manning
2092753ac610SCharles Manning d_s = list_entry(link, struct yaffs_dir_var, dirty);
2093753ac610SCharles Manning o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
2094753ac610SCharles Manning obj = list_entry(o_v, struct yaffs_obj, variant);
2095753ac610SCharles Manning
2096753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
2097753ac610SCharles Manning obj->obj_id);
2098753ac610SCharles Manning
2099753ac610SCharles Manning if (obj->dirty)
2100753ac610SCharles Manning yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
2101753ac610SCharles Manning }
21020e8cc8bdSWilliam Juul }
21030e8cc8bdSWilliam Juul
21040e8cc8bdSWilliam Juul /*
21050e8cc8bdSWilliam Juul * Mknod (create) a new object.
2106753ac610SCharles Manning * equiv_obj only has meaning for a hard link;
2107753ac610SCharles Manning * alias_str only has meaning for a symlink.
21080e8cc8bdSWilliam Juul * rdev only has meaning for devices (a subset of special objects)
21090e8cc8bdSWilliam Juul */
21100e8cc8bdSWilliam Juul
yaffs_create_obj(enum yaffs_obj_type type,struct yaffs_obj * parent,const YCHAR * name,u32 mode,u32 uid,u32 gid,struct yaffs_obj * equiv_obj,const YCHAR * alias_str,u32 rdev)2111753ac610SCharles Manning static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
2112753ac610SCharles Manning struct yaffs_obj *parent,
21130e8cc8bdSWilliam Juul const YCHAR *name,
2114753ac610SCharles Manning u32 mode,
2115753ac610SCharles Manning u32 uid,
2116753ac610SCharles Manning u32 gid,
2117753ac610SCharles Manning struct yaffs_obj *equiv_obj,
2118753ac610SCharles Manning const YCHAR *alias_str, u32 rdev)
21190e8cc8bdSWilliam Juul {
2120753ac610SCharles Manning struct yaffs_obj *in;
2121068d6f9aSWolfgang Denk YCHAR *str = NULL;
2122753ac610SCharles Manning struct yaffs_dev *dev = parent->my_dev;
21230e8cc8bdSWilliam Juul
2124753ac610SCharles Manning /* Check if the entry exists.
2125753ac610SCharles Manning * If it does then fail the call since we don't want a dup. */
2126753ac610SCharles Manning if (yaffs_find_by_name(parent, name))
21270e8cc8bdSWilliam Juul return NULL;
21280e8cc8bdSWilliam Juul
21290e8cc8bdSWilliam Juul if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2130753ac610SCharles Manning str = yaffs_clone_str(alias_str);
2131753ac610SCharles Manning if (!str)
21320e8cc8bdSWilliam Juul return NULL;
21330e8cc8bdSWilliam Juul }
2134753ac610SCharles Manning
2135753ac610SCharles Manning in = yaffs_new_obj(dev, -1, type);
2136753ac610SCharles Manning
2137753ac610SCharles Manning if (!in) {
2138753ac610SCharles Manning kfree(str);
2139753ac610SCharles Manning return NULL;
21400e8cc8bdSWilliam Juul }
21410e8cc8bdSWilliam Juul
2142753ac610SCharles Manning in->hdr_chunk = 0;
21430e8cc8bdSWilliam Juul in->valid = 1;
2144753ac610SCharles Manning in->variant_type = type;
21450e8cc8bdSWilliam Juul
21460e8cc8bdSWilliam Juul in->yst_mode = mode;
21470e8cc8bdSWilliam Juul
2148753ac610SCharles Manning yaffs_attribs_init(in, gid, uid, rdev);
21490e8cc8bdSWilliam Juul
2150753ac610SCharles Manning in->n_data_chunks = 0;
21510e8cc8bdSWilliam Juul
2152753ac610SCharles Manning yaffs_set_obj_name(in, name);
21530e8cc8bdSWilliam Juul in->dirty = 1;
21540e8cc8bdSWilliam Juul
2155753ac610SCharles Manning yaffs_add_obj_to_dir(parent, in);
21560e8cc8bdSWilliam Juul
2157753ac610SCharles Manning in->my_dev = parent->my_dev;
21580e8cc8bdSWilliam Juul
21590e8cc8bdSWilliam Juul switch (type) {
21600e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SYMLINK:
2161753ac610SCharles Manning in->variant.symlink_variant.alias = str;
21620e8cc8bdSWilliam Juul break;
21630e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_HARDLINK:
2164753ac610SCharles Manning in->variant.hardlink_variant.equiv_obj = equiv_obj;
2165753ac610SCharles Manning in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id;
2166753ac610SCharles Manning list_add(&in->hard_links, &equiv_obj->hard_links);
21670e8cc8bdSWilliam Juul break;
21680e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_FILE:
21690e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_DIRECTORY:
21700e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SPECIAL:
21710e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_UNKNOWN:
21720e8cc8bdSWilliam Juul /* do nothing */
21730e8cc8bdSWilliam Juul break;
21740e8cc8bdSWilliam Juul }
21750e8cc8bdSWilliam Juul
2176753ac610SCharles Manning if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
2177753ac610SCharles Manning /* Could not create the object header, fail */
2178753ac610SCharles Manning yaffs_del_obj(in);
21790e8cc8bdSWilliam Juul in = NULL;
21800e8cc8bdSWilliam Juul }
21810e8cc8bdSWilliam Juul
2182753ac610SCharles Manning if (in)
2183753ac610SCharles Manning yaffs_update_parent(parent);
21840e8cc8bdSWilliam Juul
21850e8cc8bdSWilliam Juul return in;
21860e8cc8bdSWilliam Juul }
21870e8cc8bdSWilliam Juul
yaffs_create_file(struct yaffs_obj * parent,const YCHAR * name,u32 mode,u32 uid,u32 gid)2188753ac610SCharles Manning struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
2189753ac610SCharles Manning const YCHAR *name, u32 mode, u32 uid,
2190753ac610SCharles Manning u32 gid)
21910e8cc8bdSWilliam Juul {
2192753ac610SCharles Manning return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
21930e8cc8bdSWilliam Juul uid, gid, NULL, NULL, 0);
21940e8cc8bdSWilliam Juul }
21950e8cc8bdSWilliam Juul
yaffs_create_dir(struct yaffs_obj * parent,const YCHAR * name,u32 mode,u32 uid,u32 gid)2196753ac610SCharles Manning struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
2197753ac610SCharles Manning u32 mode, u32 uid, u32 gid)
21980e8cc8bdSWilliam Juul {
2199753ac610SCharles Manning return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
22000e8cc8bdSWilliam Juul mode, uid, gid, NULL, NULL, 0);
22010e8cc8bdSWilliam Juul }
22020e8cc8bdSWilliam Juul
yaffs_create_special(struct yaffs_obj * parent,const YCHAR * name,u32 mode,u32 uid,u32 gid,u32 rdev)2203753ac610SCharles Manning struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
2204753ac610SCharles Manning const YCHAR *name, u32 mode, u32 uid,
2205753ac610SCharles Manning u32 gid, u32 rdev)
22060e8cc8bdSWilliam Juul {
2207753ac610SCharles Manning return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
22080e8cc8bdSWilliam Juul uid, gid, NULL, NULL, rdev);
22090e8cc8bdSWilliam Juul }
22100e8cc8bdSWilliam Juul
yaffs_create_symlink(struct yaffs_obj * parent,const YCHAR * name,u32 mode,u32 uid,u32 gid,const YCHAR * alias)2211753ac610SCharles Manning struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
2212753ac610SCharles Manning const YCHAR *name, u32 mode, u32 uid,
2213753ac610SCharles Manning u32 gid, const YCHAR *alias)
22140e8cc8bdSWilliam Juul {
2215753ac610SCharles Manning return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
22160e8cc8bdSWilliam Juul uid, gid, NULL, alias, 0);
22170e8cc8bdSWilliam Juul }
22180e8cc8bdSWilliam Juul
2219753ac610SCharles Manning /* yaffs_link_obj returns the object id of the equivalent object.*/
yaffs_link_obj(struct yaffs_obj * parent,const YCHAR * name,struct yaffs_obj * equiv_obj)2220753ac610SCharles Manning struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
2221753ac610SCharles Manning struct yaffs_obj *equiv_obj)
22220e8cc8bdSWilliam Juul {
2223753ac610SCharles Manning /* Get the real object in case we were fed a hard link obj */
2224753ac610SCharles Manning equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
22250e8cc8bdSWilliam Juul
2226753ac610SCharles Manning if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
2227753ac610SCharles Manning parent, name, 0, 0, 0,
2228753ac610SCharles Manning equiv_obj, NULL, 0))
2229753ac610SCharles Manning return equiv_obj;
2230753ac610SCharles Manning
22310e8cc8bdSWilliam Juul return NULL;
22320e8cc8bdSWilliam Juul
22330e8cc8bdSWilliam Juul }
22340e8cc8bdSWilliam Juul
2235753ac610SCharles Manning
2236753ac610SCharles Manning
2237753ac610SCharles Manning /*---------------------- Block Management and Page Allocation -------------*/
2238753ac610SCharles Manning
yaffs_deinit_blocks(struct yaffs_dev * dev)2239753ac610SCharles Manning static void yaffs_deinit_blocks(struct yaffs_dev *dev)
22400e8cc8bdSWilliam Juul {
2241753ac610SCharles Manning if (dev->block_info_alt && dev->block_info)
2242753ac610SCharles Manning vfree(dev->block_info);
2243753ac610SCharles Manning else
2244753ac610SCharles Manning kfree(dev->block_info);
22450e8cc8bdSWilliam Juul
2246753ac610SCharles Manning dev->block_info_alt = 0;
22470e8cc8bdSWilliam Juul
2248753ac610SCharles Manning dev->block_info = NULL;
2249753ac610SCharles Manning
2250753ac610SCharles Manning if (dev->chunk_bits_alt && dev->chunk_bits)
2251753ac610SCharles Manning vfree(dev->chunk_bits);
2252753ac610SCharles Manning else
2253753ac610SCharles Manning kfree(dev->chunk_bits);
2254753ac610SCharles Manning dev->chunk_bits_alt = 0;
2255753ac610SCharles Manning dev->chunk_bits = NULL;
22560e8cc8bdSWilliam Juul }
22570e8cc8bdSWilliam Juul
yaffs_init_blocks(struct yaffs_dev * dev)2258753ac610SCharles Manning static int yaffs_init_blocks(struct yaffs_dev *dev)
22590e8cc8bdSWilliam Juul {
2260753ac610SCharles Manning int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
22610e8cc8bdSWilliam Juul
2262753ac610SCharles Manning dev->block_info = NULL;
2263753ac610SCharles Manning dev->chunk_bits = NULL;
2264753ac610SCharles Manning dev->alloc_block = -1; /* force it to get a new one */
22650e8cc8bdSWilliam Juul
22660e8cc8bdSWilliam Juul /* If the first allocation strategy fails, thry the alternate one */
2267753ac610SCharles Manning dev->block_info =
2268753ac610SCharles Manning kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
2269753ac610SCharles Manning if (!dev->block_info) {
2270753ac610SCharles Manning dev->block_info =
2271753ac610SCharles Manning vmalloc(n_blocks * sizeof(struct yaffs_block_info));
2272753ac610SCharles Manning dev->block_info_alt = 1;
22730e8cc8bdSWilliam Juul } else {
2274753ac610SCharles Manning dev->block_info_alt = 0;
22750e8cc8bdSWilliam Juul }
22760e8cc8bdSWilliam Juul
2277753ac610SCharles Manning if (!dev->block_info)
2278753ac610SCharles Manning goto alloc_error;
2279753ac610SCharles Manning
2280753ac610SCharles Manning /* Set up dynamic blockinfo stuff. Round up bytes. */
2281753ac610SCharles Manning dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
2282753ac610SCharles Manning dev->chunk_bits =
2283753ac610SCharles Manning kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
2284753ac610SCharles Manning if (!dev->chunk_bits) {
2285753ac610SCharles Manning dev->chunk_bits =
2286753ac610SCharles Manning vmalloc(dev->chunk_bit_stride * n_blocks);
2287753ac610SCharles Manning dev->chunk_bits_alt = 1;
2288753ac610SCharles Manning } else {
2289753ac610SCharles Manning dev->chunk_bits_alt = 0;
2290753ac610SCharles Manning }
2291753ac610SCharles Manning if (!dev->chunk_bits)
2292753ac610SCharles Manning goto alloc_error;
2293753ac610SCharles Manning
2294753ac610SCharles Manning
2295753ac610SCharles Manning memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info));
2296753ac610SCharles Manning memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
2297753ac610SCharles Manning return YAFFS_OK;
2298753ac610SCharles Manning
2299753ac610SCharles Manning alloc_error:
2300753ac610SCharles Manning yaffs_deinit_blocks(dev);
2301753ac610SCharles Manning return YAFFS_FAIL;
23020e8cc8bdSWilliam Juul }
23030e8cc8bdSWilliam Juul
23040e8cc8bdSWilliam Juul
yaffs_block_became_dirty(struct yaffs_dev * dev,int block_no)2305753ac610SCharles Manning void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
23060e8cc8bdSWilliam Juul {
2307753ac610SCharles Manning struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
2308753ac610SCharles Manning int erased_ok = 0;
2309753ac610SCharles Manning int i;
23100e8cc8bdSWilliam Juul
23110e8cc8bdSWilliam Juul /* If the block is still healthy erase it and mark as clean.
23120e8cc8bdSWilliam Juul * If the block has had a data failure, then retire it.
23130e8cc8bdSWilliam Juul */
23140e8cc8bdSWilliam Juul
2315753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2316753ac610SCharles Manning "yaffs_block_became_dirty block %d state %d %s",
2317753ac610SCharles Manning block_no, bi->block_state,
2318753ac610SCharles Manning (bi->needs_retiring) ? "needs retiring" : "");
23190e8cc8bdSWilliam Juul
2320753ac610SCharles Manning yaffs2_clear_oldest_dirty_seq(dev, bi);
23210e8cc8bdSWilliam Juul
2322753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
2323753ac610SCharles Manning
2324753ac610SCharles Manning /* If this is the block being garbage collected then stop gc'ing */
2325753ac610SCharles Manning if (block_no == dev->gc_block)
2326753ac610SCharles Manning dev->gc_block = 0;
2327753ac610SCharles Manning
2328753ac610SCharles Manning /* If this block is currently the best candidate for gc
2329753ac610SCharles Manning * then drop as a candidate */
2330753ac610SCharles Manning if (block_no == dev->gc_dirtiest) {
2331753ac610SCharles Manning dev->gc_dirtiest = 0;
2332753ac610SCharles Manning dev->gc_pages_in_use = 0;
2333753ac610SCharles Manning }
2334753ac610SCharles Manning
2335753ac610SCharles Manning if (!bi->needs_retiring) {
2336753ac610SCharles Manning yaffs2_checkpt_invalidate(dev);
2337753ac610SCharles Manning erased_ok = yaffs_erase_block(dev, block_no);
2338753ac610SCharles Manning if (!erased_ok) {
2339753ac610SCharles Manning dev->n_erase_failures++;
2340753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2341753ac610SCharles Manning "**>> Erasure failed %d", block_no);
23420e8cc8bdSWilliam Juul }
23430e8cc8bdSWilliam Juul }
23440e8cc8bdSWilliam Juul
2345753ac610SCharles Manning /* Verify erasure if needed */
2346753ac610SCharles Manning if (erased_ok &&
2347753ac610SCharles Manning ((yaffs_trace_mask & YAFFS_TRACE_ERASE) ||
2348753ac610SCharles Manning !yaffs_skip_verification(dev))) {
2349753ac610SCharles Manning for (i = 0; i < dev->param.chunks_per_block; i++) {
2350753ac610SCharles Manning if (!yaffs_check_chunk_erased(dev,
2351753ac610SCharles Manning block_no * dev->param.chunks_per_block + i)) {
2352753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
2353753ac610SCharles Manning ">>Block %d erasure supposedly OK, but chunk %d not erased",
2354753ac610SCharles Manning block_no, i);
23550e8cc8bdSWilliam Juul }
23560e8cc8bdSWilliam Juul }
23570e8cc8bdSWilliam Juul }
23580e8cc8bdSWilliam Juul
2359753ac610SCharles Manning if (!erased_ok) {
2360753ac610SCharles Manning /* We lost a block of free space */
2361753ac610SCharles Manning dev->n_free_chunks -= dev->param.chunks_per_block;
2362753ac610SCharles Manning yaffs_retire_block(dev, block_no);
2363753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2364753ac610SCharles Manning "**>> Block %d retired", block_no);
2365753ac610SCharles Manning return;
2366753ac610SCharles Manning }
2367753ac610SCharles Manning
23680e8cc8bdSWilliam Juul /* Clean it up... */
2369753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
2370753ac610SCharles Manning bi->seq_number = 0;
2371753ac610SCharles Manning dev->n_erased_blocks++;
2372753ac610SCharles Manning bi->pages_in_use = 0;
2373753ac610SCharles Manning bi->soft_del_pages = 0;
2374753ac610SCharles Manning bi->has_shrink_hdr = 0;
2375753ac610SCharles Manning bi->skip_erased_check = 1; /* Clean, so no need to check */
2376753ac610SCharles Manning bi->gc_prioritise = 0;
2377753ac610SCharles Manning bi->has_summary = 0;
23780e8cc8bdSWilliam Juul
2379753ac610SCharles Manning yaffs_clear_chunk_bits(dev, block_no);
23800e8cc8bdSWilliam Juul
2381753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
23820e8cc8bdSWilliam Juul }
23830e8cc8bdSWilliam Juul
yaffs_gc_process_chunk(struct yaffs_dev * dev,struct yaffs_block_info * bi,int old_chunk,u8 * buffer)2384753ac610SCharles Manning static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
2385753ac610SCharles Manning struct yaffs_block_info *bi,
2386753ac610SCharles Manning int old_chunk, u8 *buffer)
23870e8cc8bdSWilliam Juul {
2388753ac610SCharles Manning int new_chunk;
2389753ac610SCharles Manning int mark_flash = 1;
2390753ac610SCharles Manning struct yaffs_ext_tags tags;
2391753ac610SCharles Manning struct yaffs_obj *object;
2392753ac610SCharles Manning int matching_chunk;
2393753ac610SCharles Manning int ret_val = YAFFS_OK;
23940e8cc8bdSWilliam Juul
2395753ac610SCharles Manning memset(&tags, 0, sizeof(tags));
2396753ac610SCharles Manning yaffs_rd_chunk_tags_nand(dev, old_chunk,
23970e8cc8bdSWilliam Juul buffer, &tags);
2398753ac610SCharles Manning object = yaffs_find_by_number(dev, tags.obj_id);
23990e8cc8bdSWilliam Juul
2400753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC_DETAIL,
2401753ac610SCharles Manning "Collecting chunk in block %d, %d %d %d ",
2402753ac610SCharles Manning dev->gc_chunk, tags.obj_id,
2403753ac610SCharles Manning tags.chunk_id, tags.n_bytes);
24040e8cc8bdSWilliam Juul
2405753ac610SCharles Manning if (object && !yaffs_skip_verification(dev)) {
2406753ac610SCharles Manning if (tags.chunk_id == 0)
2407753ac610SCharles Manning matching_chunk =
2408753ac610SCharles Manning object->hdr_chunk;
2409753ac610SCharles Manning else if (object->soft_del)
2410753ac610SCharles Manning /* Defeat the test */
2411753ac610SCharles Manning matching_chunk = old_chunk;
24120e8cc8bdSWilliam Juul else
2413753ac610SCharles Manning matching_chunk =
2414753ac610SCharles Manning yaffs_find_chunk_in_file
2415753ac610SCharles Manning (object, tags.chunk_id,
2416753ac610SCharles Manning NULL);
24170e8cc8bdSWilliam Juul
2418753ac610SCharles Manning if (old_chunk != matching_chunk)
2419753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
2420753ac610SCharles Manning "gc: page in gc mismatch: %d %d %d %d",
2421753ac610SCharles Manning old_chunk,
2422753ac610SCharles Manning matching_chunk,
2423753ac610SCharles Manning tags.obj_id,
2424753ac610SCharles Manning tags.chunk_id);
24250e8cc8bdSWilliam Juul }
24260e8cc8bdSWilliam Juul
24270e8cc8bdSWilliam Juul if (!object) {
2428753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
2429753ac610SCharles Manning "page %d in gc has no object: %d %d %d ",
2430753ac610SCharles Manning old_chunk,
2431753ac610SCharles Manning tags.obj_id, tags.chunk_id,
2432753ac610SCharles Manning tags.n_bytes);
24330e8cc8bdSWilliam Juul }
24340e8cc8bdSWilliam Juul
2435753ac610SCharles Manning if (object &&
2436753ac610SCharles Manning object->deleted &&
2437753ac610SCharles Manning object->soft_del && tags.chunk_id != 0) {
2438753ac610SCharles Manning /* Data chunk in a soft deleted file,
2439753ac610SCharles Manning * throw it away.
24400e8cc8bdSWilliam Juul * It's a soft deleted data chunk,
2441753ac610SCharles Manning * No need to copy this, just forget
2442753ac610SCharles Manning * about it and fix up the object.
24430e8cc8bdSWilliam Juul */
24440e8cc8bdSWilliam Juul
2445753ac610SCharles Manning /* Free chunks already includes
2446753ac610SCharles Manning * softdeleted chunks, how ever this
2447753ac610SCharles Manning * chunk is going to soon be really
2448753ac610SCharles Manning * deleted which will increment free
2449753ac610SCharles Manning * chunks. We have to decrement free
2450753ac610SCharles Manning * chunks so this works out properly.
2451753ac610SCharles Manning */
2452753ac610SCharles Manning dev->n_free_chunks--;
2453753ac610SCharles Manning bi->soft_del_pages--;
24540e8cc8bdSWilliam Juul
2455753ac610SCharles Manning object->n_data_chunks--;
2456753ac610SCharles Manning if (object->n_data_chunks <= 0) {
2457753ac610SCharles Manning /* remeber to clean up obj */
2458753ac610SCharles Manning dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
2459753ac610SCharles Manning dev->n_clean_ups++;
24600e8cc8bdSWilliam Juul }
2461753ac610SCharles Manning mark_flash = 0;
24620e8cc8bdSWilliam Juul } else if (object) {
2463753ac610SCharles Manning /* It's either a data chunk in a live
2464753ac610SCharles Manning * file or an ObjectHeader, so we're
2465753ac610SCharles Manning * interested in it.
2466753ac610SCharles Manning * NB Need to keep the ObjectHeaders of
2467753ac610SCharles Manning * deleted files until the whole file
2468753ac610SCharles Manning * has been deleted off
24690e8cc8bdSWilliam Juul */
2470753ac610SCharles Manning tags.serial_number++;
2471753ac610SCharles Manning dev->n_gc_copies++;
24720e8cc8bdSWilliam Juul
2473753ac610SCharles Manning if (tags.chunk_id == 0) {
24740e8cc8bdSWilliam Juul /* It is an object Id,
2475753ac610SCharles Manning * We need to nuke the
2476753ac610SCharles Manning * shrinkheader flags since its
2477753ac610SCharles Manning * work is done.
2478753ac610SCharles Manning * Also need to clean up
2479753ac610SCharles Manning * shadowing.
24800e8cc8bdSWilliam Juul */
2481753ac610SCharles Manning struct yaffs_obj_hdr *oh;
2482753ac610SCharles Manning oh = (struct yaffs_obj_hdr *) buffer;
24830e8cc8bdSWilliam Juul
2484753ac610SCharles Manning oh->is_shrink = 0;
2485753ac610SCharles Manning tags.extra_is_shrink = 0;
2486753ac610SCharles Manning oh->shadows_obj = 0;
2487753ac610SCharles Manning oh->inband_shadowed_obj_id = 0;
2488753ac610SCharles Manning tags.extra_shadows = 0;
24890e8cc8bdSWilliam Juul
2490753ac610SCharles Manning /* Update file size */
2491753ac610SCharles Manning if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) {
2492753ac610SCharles Manning yaffs_oh_size_load(oh,
2493753ac610SCharles Manning object->variant.file_variant.file_size);
2494753ac610SCharles Manning tags.extra_file_size =
2495753ac610SCharles Manning object->variant.file_variant.file_size;
24960e8cc8bdSWilliam Juul }
24970e8cc8bdSWilliam Juul
2498753ac610SCharles Manning yaffs_verify_oh(object, oh, &tags, 1);
2499753ac610SCharles Manning new_chunk =
2500753ac610SCharles Manning yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1);
2501753ac610SCharles Manning } else {
2502753ac610SCharles Manning new_chunk =
2503753ac610SCharles Manning yaffs_write_new_chunk(dev, buffer, &tags, 1);
2504753ac610SCharles Manning }
25050e8cc8bdSWilliam Juul
2506753ac610SCharles Manning if (new_chunk < 0) {
2507753ac610SCharles Manning ret_val = YAFFS_FAIL;
25080e8cc8bdSWilliam Juul } else {
25090e8cc8bdSWilliam Juul
2510753ac610SCharles Manning /* Now fix up the Tnodes etc. */
25110e8cc8bdSWilliam Juul
2512753ac610SCharles Manning if (tags.chunk_id == 0) {
25130e8cc8bdSWilliam Juul /* It's a header */
2514753ac610SCharles Manning object->hdr_chunk = new_chunk;
2515753ac610SCharles Manning object->serial = tags.serial_number;
25160e8cc8bdSWilliam Juul } else {
25170e8cc8bdSWilliam Juul /* It's a data chunk */
2518753ac610SCharles Manning yaffs_put_chunk_in_file(object, tags.chunk_id,
2519753ac610SCharles Manning new_chunk, 0);
25200e8cc8bdSWilliam Juul }
25210e8cc8bdSWilliam Juul }
25220e8cc8bdSWilliam Juul }
2523753ac610SCharles Manning if (ret_val == YAFFS_OK)
2524753ac610SCharles Manning yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
2525753ac610SCharles Manning return ret_val;
25260e8cc8bdSWilliam Juul }
25270e8cc8bdSWilliam Juul
yaffs_gc_block(struct yaffs_dev * dev,int block,int whole_block)2528753ac610SCharles Manning static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
2529753ac610SCharles Manning {
2530753ac610SCharles Manning int old_chunk;
2531753ac610SCharles Manning int ret_val = YAFFS_OK;
2532753ac610SCharles Manning int i;
2533753ac610SCharles Manning int is_checkpt_block;
2534753ac610SCharles Manning int max_copies;
2535753ac610SCharles Manning int chunks_before = yaffs_get_erased_chunks(dev);
2536753ac610SCharles Manning int chunks_after;
2537753ac610SCharles Manning struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
25380e8cc8bdSWilliam Juul
2539753ac610SCharles Manning is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
25400e8cc8bdSWilliam Juul
2541753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING,
2542753ac610SCharles Manning "Collecting block %d, in use %d, shrink %d, whole_block %d",
2543753ac610SCharles Manning block, bi->pages_in_use, bi->has_shrink_hdr,
2544753ac610SCharles Manning whole_block);
2545753ac610SCharles Manning
2546753ac610SCharles Manning /*yaffs_verify_free_chunks(dev); */
2547753ac610SCharles Manning
2548753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
2549753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
2550753ac610SCharles Manning
2551753ac610SCharles Manning bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
2552753ac610SCharles Manning
2553753ac610SCharles Manning dev->gc_disable = 1;
2554753ac610SCharles Manning
2555753ac610SCharles Manning yaffs_summary_gc(dev, block);
2556753ac610SCharles Manning
2557753ac610SCharles Manning if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
2558753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING,
2559753ac610SCharles Manning "Collecting block %d that has no chunks in use",
2560753ac610SCharles Manning block);
2561753ac610SCharles Manning yaffs_block_became_dirty(dev, block);
2562753ac610SCharles Manning } else {
2563753ac610SCharles Manning
2564753ac610SCharles Manning u8 *buffer = yaffs_get_temp_buffer(dev);
2565753ac610SCharles Manning
2566753ac610SCharles Manning yaffs_verify_blk(dev, bi, block);
2567753ac610SCharles Manning
2568753ac610SCharles Manning max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
2569753ac610SCharles Manning old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
2570753ac610SCharles Manning
2571753ac610SCharles Manning for (/* init already done */ ;
2572753ac610SCharles Manning ret_val == YAFFS_OK &&
2573753ac610SCharles Manning dev->gc_chunk < dev->param.chunks_per_block &&
2574753ac610SCharles Manning (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
2575753ac610SCharles Manning max_copies > 0;
2576753ac610SCharles Manning dev->gc_chunk++, old_chunk++) {
2577753ac610SCharles Manning if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
2578753ac610SCharles Manning /* Page is in use and might need to be copied */
2579753ac610SCharles Manning max_copies--;
2580753ac610SCharles Manning ret_val = yaffs_gc_process_chunk(dev, bi,
2581753ac610SCharles Manning old_chunk, buffer);
2582753ac610SCharles Manning }
2583753ac610SCharles Manning }
2584753ac610SCharles Manning yaffs_release_temp_buffer(dev, buffer);
2585753ac610SCharles Manning }
2586753ac610SCharles Manning
2587753ac610SCharles Manning yaffs_verify_collected_blk(dev, bi, block);
2588753ac610SCharles Manning
2589753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2590753ac610SCharles Manning /*
2591753ac610SCharles Manning * The gc did not complete. Set block state back to FULL
2592753ac610SCharles Manning * because checkpointing does not restore gc.
2593753ac610SCharles Manning */
2594753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_FULL;
2595753ac610SCharles Manning } else {
2596753ac610SCharles Manning /* The gc completed. */
25970e8cc8bdSWilliam Juul /* Do any required cleanups */
2598753ac610SCharles Manning for (i = 0; i < dev->n_clean_ups; i++) {
25990e8cc8bdSWilliam Juul /* Time to delete the file too */
2600753ac610SCharles Manning struct yaffs_obj *object =
2601753ac610SCharles Manning yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
26020e8cc8bdSWilliam Juul if (object) {
2603753ac610SCharles Manning yaffs_free_tnode(dev,
2604753ac610SCharles Manning object->variant.file_variant.top);
2605753ac610SCharles Manning object->variant.file_variant.top = NULL;
2606753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC,
2607753ac610SCharles Manning "yaffs: About to finally delete object %d",
2608753ac610SCharles Manning object->obj_id);
2609753ac610SCharles Manning yaffs_generic_obj_del(object);
2610753ac610SCharles Manning object->my_dev->n_deleted_files--;
26110e8cc8bdSWilliam Juul }
26120e8cc8bdSWilliam Juul
26130e8cc8bdSWilliam Juul }
2614753ac610SCharles Manning chunks_after = yaffs_get_erased_chunks(dev);
2615753ac610SCharles Manning if (chunks_before >= chunks_after)
2616753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC,
2617753ac610SCharles Manning "gc did not increase free chunks before %d after %d",
2618753ac610SCharles Manning chunks_before, chunks_after);
2619753ac610SCharles Manning dev->gc_block = 0;
2620753ac610SCharles Manning dev->gc_chunk = 0;
2621753ac610SCharles Manning dev->n_clean_ups = 0;
26220e8cc8bdSWilliam Juul }
26230e8cc8bdSWilliam Juul
2624753ac610SCharles Manning dev->gc_disable = 0;
26250e8cc8bdSWilliam Juul
2626753ac610SCharles Manning return ret_val;
26270e8cc8bdSWilliam Juul }
26280e8cc8bdSWilliam Juul
2629753ac610SCharles Manning /*
2630753ac610SCharles Manning * find_gc_block() selects the dirtiest block (or close enough)
2631753ac610SCharles Manning * for garbage collection.
2632753ac610SCharles Manning */
26330e8cc8bdSWilliam Juul
yaffs_find_gc_block(struct yaffs_dev * dev,int aggressive,int background)2634753ac610SCharles Manning static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
2635753ac610SCharles Manning int aggressive, int background)
2636753ac610SCharles Manning {
2637753ac610SCharles Manning int i;
2638753ac610SCharles Manning int iterations;
2639753ac610SCharles Manning unsigned selected = 0;
2640753ac610SCharles Manning int prioritised = 0;
2641753ac610SCharles Manning int prioritised_exist = 0;
2642753ac610SCharles Manning struct yaffs_block_info *bi;
2643753ac610SCharles Manning int threshold;
2644753ac610SCharles Manning
2645753ac610SCharles Manning /* First let's see if we need to grab a prioritised block */
2646753ac610SCharles Manning if (dev->has_pending_prioritised_gc && !aggressive) {
2647753ac610SCharles Manning dev->gc_dirtiest = 0;
2648753ac610SCharles Manning bi = dev->block_info;
2649753ac610SCharles Manning for (i = dev->internal_start_block;
2650753ac610SCharles Manning i <= dev->internal_end_block && !selected; i++) {
2651753ac610SCharles Manning
2652753ac610SCharles Manning if (bi->gc_prioritise) {
2653753ac610SCharles Manning prioritised_exist = 1;
2654753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2655753ac610SCharles Manning yaffs_block_ok_for_gc(dev, bi)) {
2656753ac610SCharles Manning selected = i;
2657753ac610SCharles Manning prioritised = 1;
2658753ac610SCharles Manning }
2659753ac610SCharles Manning }
2660753ac610SCharles Manning bi++;
2661753ac610SCharles Manning }
2662753ac610SCharles Manning
2663753ac610SCharles Manning /*
2664753ac610SCharles Manning * If there is a prioritised block and none was selected then
2665753ac610SCharles Manning * this happened because there is at least one old dirty block
2666753ac610SCharles Manning * gumming up the works. Let's gc the oldest dirty block.
2667753ac610SCharles Manning */
2668753ac610SCharles Manning
2669753ac610SCharles Manning if (prioritised_exist &&
2670753ac610SCharles Manning !selected && dev->oldest_dirty_block > 0)
2671753ac610SCharles Manning selected = dev->oldest_dirty_block;
2672753ac610SCharles Manning
2673753ac610SCharles Manning if (!prioritised_exist) /* None found, so we can clear this */
2674753ac610SCharles Manning dev->has_pending_prioritised_gc = 0;
2675753ac610SCharles Manning }
2676753ac610SCharles Manning
2677753ac610SCharles Manning /* If we're doing aggressive GC then we are happy to take a less-dirty
2678753ac610SCharles Manning * block, and search harder.
2679753ac610SCharles Manning * else (leasurely gc), then we only bother to do this if the
2680753ac610SCharles Manning * block has only a few pages in use.
2681753ac610SCharles Manning */
2682753ac610SCharles Manning
2683753ac610SCharles Manning if (!selected) {
2684753ac610SCharles Manning int pages_used;
2685753ac610SCharles Manning int n_blocks =
2686753ac610SCharles Manning dev->internal_end_block - dev->internal_start_block + 1;
2687753ac610SCharles Manning if (aggressive) {
2688753ac610SCharles Manning threshold = dev->param.chunks_per_block;
2689753ac610SCharles Manning iterations = n_blocks;
2690753ac610SCharles Manning } else {
2691753ac610SCharles Manning int max_threshold;
2692753ac610SCharles Manning
2693753ac610SCharles Manning if (background)
2694753ac610SCharles Manning max_threshold = dev->param.chunks_per_block / 2;
2695753ac610SCharles Manning else
2696753ac610SCharles Manning max_threshold = dev->param.chunks_per_block / 8;
2697753ac610SCharles Manning
2698753ac610SCharles Manning if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2699753ac610SCharles Manning max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2700753ac610SCharles Manning
2701753ac610SCharles Manning threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
2702753ac610SCharles Manning if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2703753ac610SCharles Manning threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2704753ac610SCharles Manning if (threshold > max_threshold)
2705753ac610SCharles Manning threshold = max_threshold;
2706753ac610SCharles Manning
2707753ac610SCharles Manning iterations = n_blocks / 16 + 1;
2708753ac610SCharles Manning if (iterations > 100)
2709753ac610SCharles Manning iterations = 100;
2710753ac610SCharles Manning }
2711753ac610SCharles Manning
2712753ac610SCharles Manning for (i = 0;
2713753ac610SCharles Manning i < iterations &&
2714753ac610SCharles Manning (dev->gc_dirtiest < 1 ||
2715753ac610SCharles Manning dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
2716753ac610SCharles Manning i++) {
2717753ac610SCharles Manning dev->gc_block_finder++;
2718753ac610SCharles Manning if (dev->gc_block_finder < dev->internal_start_block ||
2719753ac610SCharles Manning dev->gc_block_finder > dev->internal_end_block)
2720753ac610SCharles Manning dev->gc_block_finder =
2721753ac610SCharles Manning dev->internal_start_block;
2722753ac610SCharles Manning
2723753ac610SCharles Manning bi = yaffs_get_block_info(dev, dev->gc_block_finder);
2724753ac610SCharles Manning
2725753ac610SCharles Manning pages_used = bi->pages_in_use - bi->soft_del_pages;
2726753ac610SCharles Manning
2727753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2728753ac610SCharles Manning pages_used < dev->param.chunks_per_block &&
2729753ac610SCharles Manning (dev->gc_dirtiest < 1 ||
2730753ac610SCharles Manning pages_used < dev->gc_pages_in_use) &&
2731753ac610SCharles Manning yaffs_block_ok_for_gc(dev, bi)) {
2732753ac610SCharles Manning dev->gc_dirtiest = dev->gc_block_finder;
2733753ac610SCharles Manning dev->gc_pages_in_use = pages_used;
2734753ac610SCharles Manning }
2735753ac610SCharles Manning }
2736753ac610SCharles Manning
2737753ac610SCharles Manning if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
2738753ac610SCharles Manning selected = dev->gc_dirtiest;
2739753ac610SCharles Manning }
2740753ac610SCharles Manning
2741753ac610SCharles Manning /*
2742753ac610SCharles Manning * If nothing has been selected for a while, try the oldest dirty
2743753ac610SCharles Manning * because that's gumming up the works.
2744753ac610SCharles Manning */
2745753ac610SCharles Manning
2746753ac610SCharles Manning if (!selected && dev->param.is_yaffs2 &&
2747753ac610SCharles Manning dev->gc_not_done >= (background ? 10 : 20)) {
2748753ac610SCharles Manning yaffs2_find_oldest_dirty_seq(dev);
2749753ac610SCharles Manning if (dev->oldest_dirty_block > 0) {
2750753ac610SCharles Manning selected = dev->oldest_dirty_block;
2751753ac610SCharles Manning dev->gc_dirtiest = selected;
2752753ac610SCharles Manning dev->oldest_dirty_gc_count++;
2753753ac610SCharles Manning bi = yaffs_get_block_info(dev, selected);
2754753ac610SCharles Manning dev->gc_pages_in_use =
2755753ac610SCharles Manning bi->pages_in_use - bi->soft_del_pages;
2756753ac610SCharles Manning } else {
2757753ac610SCharles Manning dev->gc_not_done = 0;
2758753ac610SCharles Manning }
2759753ac610SCharles Manning }
2760753ac610SCharles Manning
2761753ac610SCharles Manning if (selected) {
2762753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC,
2763753ac610SCharles Manning "GC Selected block %d with %d free, prioritised:%d",
2764753ac610SCharles Manning selected,
2765753ac610SCharles Manning dev->param.chunks_per_block - dev->gc_pages_in_use,
2766753ac610SCharles Manning prioritised);
2767753ac610SCharles Manning
2768753ac610SCharles Manning dev->n_gc_blocks++;
2769753ac610SCharles Manning if (background)
2770753ac610SCharles Manning dev->bg_gcs++;
2771753ac610SCharles Manning
2772753ac610SCharles Manning dev->gc_dirtiest = 0;
2773753ac610SCharles Manning dev->gc_pages_in_use = 0;
2774753ac610SCharles Manning dev->gc_not_done = 0;
2775753ac610SCharles Manning if (dev->refresh_skip > 0)
2776753ac610SCharles Manning dev->refresh_skip--;
2777753ac610SCharles Manning } else {
2778753ac610SCharles Manning dev->gc_not_done++;
2779753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC,
2780753ac610SCharles Manning "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
2781753ac610SCharles Manning dev->gc_block_finder, dev->gc_not_done, threshold,
2782753ac610SCharles Manning dev->gc_dirtiest, dev->gc_pages_in_use,
2783753ac610SCharles Manning dev->oldest_dirty_block, background ? " bg" : "");
2784753ac610SCharles Manning }
2785753ac610SCharles Manning
2786753ac610SCharles Manning return selected;
27870e8cc8bdSWilliam Juul }
27880e8cc8bdSWilliam Juul
27890e8cc8bdSWilliam Juul /* New garbage collector
27900e8cc8bdSWilliam Juul * If we're very low on erased blocks then we do aggressive garbage collection
27910e8cc8bdSWilliam Juul * otherwise we do "leasurely" garbage collection.
27920e8cc8bdSWilliam Juul * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2793753ac610SCharles Manning * Passive gc only inspects smaller areas and only accepts more dirty blocks.
27940e8cc8bdSWilliam Juul *
27950e8cc8bdSWilliam Juul * The idea is to help clear out space in a more spread-out manner.
27960e8cc8bdSWilliam Juul * Dunno if it really does anything useful.
27970e8cc8bdSWilliam Juul */
yaffs_check_gc(struct yaffs_dev * dev,int background)2798753ac610SCharles Manning static int yaffs_check_gc(struct yaffs_dev *dev, int background)
27990e8cc8bdSWilliam Juul {
2800753ac610SCharles Manning int aggressive = 0;
2801753ac610SCharles Manning int gc_ok = YAFFS_OK;
2802753ac610SCharles Manning int max_tries = 0;
2803753ac610SCharles Manning int min_erased;
2804753ac610SCharles Manning int erased_chunks;
2805753ac610SCharles Manning int checkpt_block_adjust;
28060e8cc8bdSWilliam Juul
2807753ac610SCharles Manning if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0)
2808753ac610SCharles Manning return YAFFS_OK;
28090e8cc8bdSWilliam Juul
2810753ac610SCharles Manning if (dev->gc_disable)
28110e8cc8bdSWilliam Juul /* Bail out so we don't get recursive gc */
28120e8cc8bdSWilliam Juul return YAFFS_OK;
28130e8cc8bdSWilliam Juul
28140e8cc8bdSWilliam Juul /* This loop should pass the first time.
2815753ac610SCharles Manning * Only loops here if the collection does not increase space.
28160e8cc8bdSWilliam Juul */
28170e8cc8bdSWilliam Juul
28180e8cc8bdSWilliam Juul do {
2819753ac610SCharles Manning max_tries++;
28200e8cc8bdSWilliam Juul
2821753ac610SCharles Manning checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
28220e8cc8bdSWilliam Juul
2823753ac610SCharles Manning min_erased =
2824753ac610SCharles Manning dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
2825753ac610SCharles Manning erased_chunks =
2826753ac610SCharles Manning dev->n_erased_blocks * dev->param.chunks_per_block;
2827753ac610SCharles Manning
2828753ac610SCharles Manning /* If we need a block soon then do aggressive gc. */
2829753ac610SCharles Manning if (dev->n_erased_blocks < min_erased)
28300e8cc8bdSWilliam Juul aggressive = 1;
2831753ac610SCharles Manning else {
2832753ac610SCharles Manning if (!background
2833753ac610SCharles Manning && erased_chunks > (dev->n_free_chunks / 4))
2834753ac610SCharles Manning break;
2835753ac610SCharles Manning
2836753ac610SCharles Manning if (dev->gc_skip > 20)
2837753ac610SCharles Manning dev->gc_skip = 20;
2838753ac610SCharles Manning if (erased_chunks < dev->n_free_chunks / 2 ||
2839753ac610SCharles Manning dev->gc_skip < 1 || background)
28400e8cc8bdSWilliam Juul aggressive = 0;
2841753ac610SCharles Manning else {
2842753ac610SCharles Manning dev->gc_skip--;
2843753ac610SCharles Manning break;
2844753ac610SCharles Manning }
28450e8cc8bdSWilliam Juul }
28460e8cc8bdSWilliam Juul
2847753ac610SCharles Manning dev->gc_skip = 5;
28480e8cc8bdSWilliam Juul
2849753ac610SCharles Manning /* If we don't already have a block being gc'd then see if we
2850753ac610SCharles Manning * should start another */
2851753ac610SCharles Manning
2852753ac610SCharles Manning if (dev->gc_block < 1 && !aggressive) {
2853753ac610SCharles Manning dev->gc_block = yaffs2_find_refresh_block(dev);
2854753ac610SCharles Manning dev->gc_chunk = 0;
2855753ac610SCharles Manning dev->n_clean_ups = 0;
2856753ac610SCharles Manning }
2857753ac610SCharles Manning if (dev->gc_block < 1) {
2858753ac610SCharles Manning dev->gc_block =
2859753ac610SCharles Manning yaffs_find_gc_block(dev, aggressive, background);
2860753ac610SCharles Manning dev->gc_chunk = 0;
2861753ac610SCharles Manning dev->n_clean_ups = 0;
28620e8cc8bdSWilliam Juul }
28630e8cc8bdSWilliam Juul
2864753ac610SCharles Manning if (dev->gc_block > 0) {
2865753ac610SCharles Manning dev->all_gcs++;
2866753ac610SCharles Manning if (!aggressive)
2867753ac610SCharles Manning dev->passive_gc_count++;
28680e8cc8bdSWilliam Juul
2869753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC,
2870753ac610SCharles Manning "yaffs: GC n_erased_blocks %d aggressive %d",
2871753ac610SCharles Manning dev->n_erased_blocks, aggressive);
2872753ac610SCharles Manning
2873753ac610SCharles Manning gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
28740e8cc8bdSWilliam Juul }
28750e8cc8bdSWilliam Juul
2876753ac610SCharles Manning if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) &&
2877753ac610SCharles Manning dev->gc_block > 0) {
2878753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC,
2879753ac610SCharles Manning "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
2880753ac610SCharles Manning dev->n_erased_blocks, max_tries,
2881753ac610SCharles Manning dev->gc_block);
28820e8cc8bdSWilliam Juul }
2883753ac610SCharles Manning } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
2884753ac610SCharles Manning (dev->gc_block > 0) && (max_tries < 2));
28850e8cc8bdSWilliam Juul
2886753ac610SCharles Manning return aggressive ? gc_ok : YAFFS_OK;
28870e8cc8bdSWilliam Juul }
28880e8cc8bdSWilliam Juul
2889753ac610SCharles Manning /*
2890753ac610SCharles Manning * yaffs_bg_gc()
2891753ac610SCharles Manning * Garbage collects. Intended to be called from a background thread.
2892753ac610SCharles Manning * Returns non-zero if at least half the free chunks are erased.
2893753ac610SCharles Manning */
yaffs_bg_gc(struct yaffs_dev * dev,unsigned urgency)2894753ac610SCharles Manning int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
28950e8cc8bdSWilliam Juul {
2896753ac610SCharles Manning int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
28970e8cc8bdSWilliam Juul
2898753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
2899753ac610SCharles Manning
2900753ac610SCharles Manning yaffs_check_gc(dev, 1);
2901753ac610SCharles Manning return erased_chunks > dev->n_free_chunks / 2;
29020e8cc8bdSWilliam Juul }
29030e8cc8bdSWilliam Juul
29040e8cc8bdSWilliam Juul /*-------------------- Data file manipulation -----------------*/
29050e8cc8bdSWilliam Juul
yaffs_rd_data_obj(struct yaffs_obj * in,int inode_chunk,u8 * buffer)2906753ac610SCharles Manning static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
29070e8cc8bdSWilliam Juul {
2908753ac610SCharles Manning int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
29090e8cc8bdSWilliam Juul
2910753ac610SCharles Manning if (nand_chunk >= 0)
2911753ac610SCharles Manning return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
29120e8cc8bdSWilliam Juul buffer, NULL);
2913753ac610SCharles Manning else {
2914753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_NANDACCESS,
2915753ac610SCharles Manning "Chunk %d not found zero instead",
2916753ac610SCharles Manning nand_chunk);
29170e8cc8bdSWilliam Juul /* get sane (zero) data if you read a hole */
2918753ac610SCharles Manning memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
29190e8cc8bdSWilliam Juul return 0;
29200e8cc8bdSWilliam Juul }
29210e8cc8bdSWilliam Juul
29220e8cc8bdSWilliam Juul }
29230e8cc8bdSWilliam Juul
yaffs_chunk_del(struct yaffs_dev * dev,int chunk_id,int mark_flash,int lyn)2924753ac610SCharles Manning void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
2925753ac610SCharles Manning int lyn)
29260e8cc8bdSWilliam Juul {
29270e8cc8bdSWilliam Juul int block;
29280e8cc8bdSWilliam Juul int page;
2929753ac610SCharles Manning struct yaffs_ext_tags tags;
2930753ac610SCharles Manning struct yaffs_block_info *bi;
29310e8cc8bdSWilliam Juul
2932753ac610SCharles Manning if (chunk_id <= 0)
29330e8cc8bdSWilliam Juul return;
29340e8cc8bdSWilliam Juul
2935753ac610SCharles Manning dev->n_deletions++;
2936753ac610SCharles Manning block = chunk_id / dev->param.chunks_per_block;
2937753ac610SCharles Manning page = chunk_id % dev->param.chunks_per_block;
29380e8cc8bdSWilliam Juul
2939753ac610SCharles Manning if (!yaffs_check_chunk_bit(dev, block, page))
2940753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_VERIFY,
2941753ac610SCharles Manning "Deleting invalid chunk %d", chunk_id);
29420e8cc8bdSWilliam Juul
2943753ac610SCharles Manning bi = yaffs_get_block_info(dev, block);
29440e8cc8bdSWilliam Juul
2945753ac610SCharles Manning yaffs2_update_oldest_dirty_seq(dev, block, bi);
29460e8cc8bdSWilliam Juul
2947753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_DELETION,
2948753ac610SCharles Manning "line %d delete of chunk %d",
2949753ac610SCharles Manning lyn, chunk_id);
29500e8cc8bdSWilliam Juul
2951753ac610SCharles Manning if (!dev->param.is_yaffs2 && mark_flash &&
2952753ac610SCharles Manning bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
29530e8cc8bdSWilliam Juul
2954753ac610SCharles Manning memset(&tags, 0, sizeof(tags));
2955753ac610SCharles Manning tags.is_deleted = 1;
2956753ac610SCharles Manning yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
2957753ac610SCharles Manning yaffs_handle_chunk_update(dev, chunk_id, &tags);
29580e8cc8bdSWilliam Juul } else {
2959753ac610SCharles Manning dev->n_unmarked_deletions++;
29600e8cc8bdSWilliam Juul }
29610e8cc8bdSWilliam Juul
29620e8cc8bdSWilliam Juul /* Pull out of the management area.
29630e8cc8bdSWilliam Juul * If the whole block became dirty, this will kick off an erasure.
29640e8cc8bdSWilliam Juul */
2965753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
2966753ac610SCharles Manning bi->block_state == YAFFS_BLOCK_STATE_FULL ||
2967753ac610SCharles Manning bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
2968753ac610SCharles Manning bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2969753ac610SCharles Manning dev->n_free_chunks++;
2970753ac610SCharles Manning yaffs_clear_chunk_bit(dev, block, page);
2971753ac610SCharles Manning bi->pages_in_use--;
29720e8cc8bdSWilliam Juul
2973753ac610SCharles Manning if (bi->pages_in_use == 0 &&
2974753ac610SCharles Manning !bi->has_shrink_hdr &&
2975753ac610SCharles Manning bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
2976753ac610SCharles Manning bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) {
2977753ac610SCharles Manning yaffs_block_became_dirty(dev, block);
2978753ac610SCharles Manning }
2979753ac610SCharles Manning }
29800e8cc8bdSWilliam Juul }
29810e8cc8bdSWilliam Juul
yaffs_wr_data_obj(struct yaffs_obj * in,int inode_chunk,const u8 * buffer,int n_bytes,int use_reserve)2982753ac610SCharles Manning static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
2983753ac610SCharles Manning const u8 *buffer, int n_bytes, int use_reserve)
29840e8cc8bdSWilliam Juul {
29850e8cc8bdSWilliam Juul /* Find old chunk Need to do this to get serial number
29860e8cc8bdSWilliam Juul * Write new one and patch into tree.
29870e8cc8bdSWilliam Juul * Invalidate old tags.
29880e8cc8bdSWilliam Juul */
29890e8cc8bdSWilliam Juul
2990753ac610SCharles Manning int prev_chunk_id;
2991753ac610SCharles Manning struct yaffs_ext_tags prev_tags;
2992753ac610SCharles Manning int new_chunk_id;
2993753ac610SCharles Manning struct yaffs_ext_tags new_tags;
2994753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev;
29950e8cc8bdSWilliam Juul
2996753ac610SCharles Manning yaffs_check_gc(dev, 0);
29970e8cc8bdSWilliam Juul
2998753ac610SCharles Manning /* Get the previous chunk at this location in the file if it exists.
2999753ac610SCharles Manning * If it does not exist then put a zero into the tree. This creates
3000753ac610SCharles Manning * the tnode now, rather than later when it is harder to clean up.
3001753ac610SCharles Manning */
3002753ac610SCharles Manning prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
3003753ac610SCharles Manning if (prev_chunk_id < 1 &&
3004753ac610SCharles Manning !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
3005753ac610SCharles Manning return 0;
30060e8cc8bdSWilliam Juul
30070e8cc8bdSWilliam Juul /* Set up new tags */
3008753ac610SCharles Manning memset(&new_tags, 0, sizeof(new_tags));
30090e8cc8bdSWilliam Juul
3010753ac610SCharles Manning new_tags.chunk_id = inode_chunk;
3011753ac610SCharles Manning new_tags.obj_id = in->obj_id;
3012753ac610SCharles Manning new_tags.serial_number =
3013753ac610SCharles Manning (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
3014753ac610SCharles Manning new_tags.n_bytes = n_bytes;
30150e8cc8bdSWilliam Juul
3016753ac610SCharles Manning if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
3017753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
3018753ac610SCharles Manning "Writing %d bytes to chunk!!!!!!!!!",
3019753ac610SCharles Manning n_bytes);
3020753ac610SCharles Manning BUG();
3021753ac610SCharles Manning }
30220e8cc8bdSWilliam Juul
3023753ac610SCharles Manning new_chunk_id =
3024753ac610SCharles Manning yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
30250e8cc8bdSWilliam Juul
3026753ac610SCharles Manning if (new_chunk_id > 0) {
3027753ac610SCharles Manning yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
3028753ac610SCharles Manning
3029753ac610SCharles Manning if (prev_chunk_id > 0)
3030753ac610SCharles Manning yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
3031753ac610SCharles Manning
3032753ac610SCharles Manning yaffs_verify_file_sane(in);
3033753ac610SCharles Manning }
3034753ac610SCharles Manning return new_chunk_id;
30350e8cc8bdSWilliam Juul
30360e8cc8bdSWilliam Juul }
30370e8cc8bdSWilliam Juul
30380e8cc8bdSWilliam Juul
3039753ac610SCharles Manning
yaffs_do_xattrib_mod(struct yaffs_obj * obj,int set,const YCHAR * name,const void * value,int size,int flags)3040753ac610SCharles Manning static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
3041753ac610SCharles Manning const YCHAR *name, const void *value, int size,
3042753ac610SCharles Manning int flags)
3043753ac610SCharles Manning {
3044753ac610SCharles Manning struct yaffs_xattr_mod xmod;
3045753ac610SCharles Manning int result;
3046753ac610SCharles Manning
3047753ac610SCharles Manning xmod.set = set;
3048753ac610SCharles Manning xmod.name = name;
3049753ac610SCharles Manning xmod.data = value;
3050753ac610SCharles Manning xmod.size = size;
3051753ac610SCharles Manning xmod.flags = flags;
3052753ac610SCharles Manning xmod.result = -ENOSPC;
3053753ac610SCharles Manning
3054753ac610SCharles Manning result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
3055753ac610SCharles Manning
3056753ac610SCharles Manning if (result > 0)
3057753ac610SCharles Manning return xmod.result;
3058753ac610SCharles Manning else
3059753ac610SCharles Manning return -ENOSPC;
3060753ac610SCharles Manning }
3061753ac610SCharles Manning
yaffs_apply_xattrib_mod(struct yaffs_obj * obj,char * buffer,struct yaffs_xattr_mod * xmod)3062753ac610SCharles Manning static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
3063753ac610SCharles Manning struct yaffs_xattr_mod *xmod)
3064753ac610SCharles Manning {
3065753ac610SCharles Manning int retval = 0;
3066753ac610SCharles Manning int x_offs = sizeof(struct yaffs_obj_hdr);
3067753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev;
3068753ac610SCharles Manning int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
3069753ac610SCharles Manning char *x_buffer = buffer + x_offs;
3070753ac610SCharles Manning
3071753ac610SCharles Manning if (xmod->set)
3072753ac610SCharles Manning retval =
3073753ac610SCharles Manning nval_set(x_buffer, x_size, xmod->name, xmod->data,
3074753ac610SCharles Manning xmod->size, xmod->flags);
3075753ac610SCharles Manning else
3076753ac610SCharles Manning retval = nval_del(x_buffer, x_size, xmod->name);
3077753ac610SCharles Manning
3078753ac610SCharles Manning obj->has_xattr = nval_hasvalues(x_buffer, x_size);
3079753ac610SCharles Manning obj->xattr_known = 1;
3080753ac610SCharles Manning xmod->result = retval;
3081753ac610SCharles Manning
3082753ac610SCharles Manning return retval;
3083753ac610SCharles Manning }
3084753ac610SCharles Manning
yaffs_do_xattrib_fetch(struct yaffs_obj * obj,const YCHAR * name,void * value,int size)3085753ac610SCharles Manning static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name,
3086753ac610SCharles Manning void *value, int size)
3087753ac610SCharles Manning {
3088753ac610SCharles Manning char *buffer = NULL;
3089753ac610SCharles Manning int result;
3090753ac610SCharles Manning struct yaffs_ext_tags tags;
3091753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev;
3092753ac610SCharles Manning int x_offs = sizeof(struct yaffs_obj_hdr);
3093753ac610SCharles Manning int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
3094753ac610SCharles Manning char *x_buffer;
3095753ac610SCharles Manning int retval = 0;
3096753ac610SCharles Manning
3097753ac610SCharles Manning if (obj->hdr_chunk < 1)
3098753ac610SCharles Manning return -ENODATA;
3099753ac610SCharles Manning
3100753ac610SCharles Manning /* If we know that the object has no xattribs then don't do all the
3101753ac610SCharles Manning * reading and parsing.
3102753ac610SCharles Manning */
3103753ac610SCharles Manning if (obj->xattr_known && !obj->has_xattr) {
3104753ac610SCharles Manning if (name)
3105753ac610SCharles Manning return -ENODATA;
3106753ac610SCharles Manning else
3107753ac610SCharles Manning return 0;
3108753ac610SCharles Manning }
3109753ac610SCharles Manning
3110753ac610SCharles Manning buffer = (char *)yaffs_get_temp_buffer(dev);
3111753ac610SCharles Manning if (!buffer)
3112753ac610SCharles Manning return -ENOMEM;
3113753ac610SCharles Manning
3114753ac610SCharles Manning result =
3115753ac610SCharles Manning yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
3116753ac610SCharles Manning
3117753ac610SCharles Manning if (result != YAFFS_OK)
3118753ac610SCharles Manning retval = -ENOENT;
3119753ac610SCharles Manning else {
3120753ac610SCharles Manning x_buffer = buffer + x_offs;
3121753ac610SCharles Manning
3122753ac610SCharles Manning if (!obj->xattr_known) {
3123753ac610SCharles Manning obj->has_xattr = nval_hasvalues(x_buffer, x_size);
3124753ac610SCharles Manning obj->xattr_known = 1;
3125753ac610SCharles Manning }
3126753ac610SCharles Manning
3127753ac610SCharles Manning if (name)
3128753ac610SCharles Manning retval = nval_get(x_buffer, x_size, name, value, size);
3129753ac610SCharles Manning else
3130753ac610SCharles Manning retval = nval_list(x_buffer, x_size, value, size);
3131753ac610SCharles Manning }
3132753ac610SCharles Manning yaffs_release_temp_buffer(dev, (u8 *) buffer);
3133753ac610SCharles Manning return retval;
3134753ac610SCharles Manning }
3135753ac610SCharles Manning
yaffs_set_xattrib(struct yaffs_obj * obj,const YCHAR * name,const void * value,int size,int flags)3136753ac610SCharles Manning int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
3137753ac610SCharles Manning const void *value, int size, int flags)
3138753ac610SCharles Manning {
3139753ac610SCharles Manning return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
3140753ac610SCharles Manning }
3141753ac610SCharles Manning
yaffs_remove_xattrib(struct yaffs_obj * obj,const YCHAR * name)3142753ac610SCharles Manning int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
3143753ac610SCharles Manning {
3144753ac610SCharles Manning return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
3145753ac610SCharles Manning }
3146753ac610SCharles Manning
yaffs_get_xattrib(struct yaffs_obj * obj,const YCHAR * name,void * value,int size)3147753ac610SCharles Manning int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
3148753ac610SCharles Manning int size)
3149753ac610SCharles Manning {
3150753ac610SCharles Manning return yaffs_do_xattrib_fetch(obj, name, value, size);
3151753ac610SCharles Manning }
3152753ac610SCharles Manning
yaffs_list_xattrib(struct yaffs_obj * obj,char * buffer,int size)3153753ac610SCharles Manning int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
3154753ac610SCharles Manning {
3155753ac610SCharles Manning return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
3156753ac610SCharles Manning }
3157753ac610SCharles Manning
yaffs_check_obj_details_loaded(struct yaffs_obj * in)3158753ac610SCharles Manning static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
3159753ac610SCharles Manning {
3160753ac610SCharles Manning u8 *buf;
3161753ac610SCharles Manning struct yaffs_obj_hdr *oh;
3162753ac610SCharles Manning struct yaffs_dev *dev;
3163753ac610SCharles Manning struct yaffs_ext_tags tags;
3164753ac610SCharles Manning
3165753ac610SCharles Manning if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
3166753ac610SCharles Manning return;
3167753ac610SCharles Manning
3168753ac610SCharles Manning dev = in->my_dev;
3169753ac610SCharles Manning in->lazy_loaded = 0;
3170753ac610SCharles Manning buf = yaffs_get_temp_buffer(dev);
3171753ac610SCharles Manning
31728cc64bafSAnatolij Gustschin yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags);
3173753ac610SCharles Manning oh = (struct yaffs_obj_hdr *)buf;
3174753ac610SCharles Manning
3175753ac610SCharles Manning in->yst_mode = oh->yst_mode;
3176753ac610SCharles Manning yaffs_load_attribs(in, oh);
3177753ac610SCharles Manning yaffs_set_obj_name_from_oh(in, oh);
3178753ac610SCharles Manning
3179753ac610SCharles Manning if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
3180753ac610SCharles Manning in->variant.symlink_variant.alias =
3181753ac610SCharles Manning yaffs_clone_str(oh->alias);
3182753ac610SCharles Manning }
3183753ac610SCharles Manning yaffs_release_temp_buffer(dev, buf);
3184753ac610SCharles Manning }
3185753ac610SCharles Manning
yaffs_load_name_from_oh(struct yaffs_dev * dev,YCHAR * name,const YCHAR * oh_name,int buff_size)3186753ac610SCharles Manning static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name,
3187753ac610SCharles Manning const YCHAR *oh_name, int buff_size)
3188753ac610SCharles Manning {
3189753ac610SCharles Manning #ifdef CONFIG_YAFFS_AUTO_UNICODE
3190753ac610SCharles Manning if (dev->param.auto_unicode) {
3191753ac610SCharles Manning if (*oh_name) {
3192753ac610SCharles Manning /* It is an ASCII name, do an ASCII to
3193753ac610SCharles Manning * unicode conversion */
3194753ac610SCharles Manning const char *ascii_oh_name = (const char *)oh_name;
3195753ac610SCharles Manning int n = buff_size - 1;
3196753ac610SCharles Manning while (n > 0 && *ascii_oh_name) {
3197753ac610SCharles Manning *name = *ascii_oh_name;
3198753ac610SCharles Manning name++;
3199753ac610SCharles Manning ascii_oh_name++;
3200753ac610SCharles Manning n--;
3201753ac610SCharles Manning }
3202753ac610SCharles Manning } else {
3203753ac610SCharles Manning yaffs_strncpy(name, oh_name + 1, buff_size - 1);
3204753ac610SCharles Manning }
3205862c93e9SJeroen Hofstee
3206862c93e9SJeroen Hofstee return;
3207753ac610SCharles Manning }
3208862c93e9SJeroen Hofstee #endif
3209862c93e9SJeroen Hofstee
3210862c93e9SJeroen Hofstee yaffs_strncpy(name, oh_name, buff_size - 1);
3211753ac610SCharles Manning }
3212753ac610SCharles Manning
yaffs_load_oh_from_name(struct yaffs_dev * dev,YCHAR * oh_name,const YCHAR * name)3213753ac610SCharles Manning static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name,
3214753ac610SCharles Manning const YCHAR *name)
3215753ac610SCharles Manning {
3216753ac610SCharles Manning #ifdef CONFIG_YAFFS_AUTO_UNICODE
3217753ac610SCharles Manning int is_ascii;
3218753ac610SCharles Manning YCHAR *w;
3219753ac610SCharles Manning
3220753ac610SCharles Manning if (dev->param.auto_unicode) {
3221753ac610SCharles Manning
3222753ac610SCharles Manning is_ascii = 1;
3223753ac610SCharles Manning w = name;
3224753ac610SCharles Manning
3225753ac610SCharles Manning /* Figure out if the name will fit in ascii character set */
3226753ac610SCharles Manning while (is_ascii && *w) {
3227753ac610SCharles Manning if ((*w) & 0xff00)
3228753ac610SCharles Manning is_ascii = 0;
3229753ac610SCharles Manning w++;
3230753ac610SCharles Manning }
3231753ac610SCharles Manning
3232753ac610SCharles Manning if (is_ascii) {
3233753ac610SCharles Manning /* It is an ASCII name, so convert unicode to ascii */
3234753ac610SCharles Manning char *ascii_oh_name = (char *)oh_name;
3235753ac610SCharles Manning int n = YAFFS_MAX_NAME_LENGTH - 1;
3236753ac610SCharles Manning while (n > 0 && *name) {
3237753ac610SCharles Manning *ascii_oh_name = *name;
3238753ac610SCharles Manning name++;
3239753ac610SCharles Manning ascii_oh_name++;
3240753ac610SCharles Manning n--;
3241753ac610SCharles Manning }
3242753ac610SCharles Manning } else {
3243753ac610SCharles Manning /* Unicode name, so save starting at the second YCHAR */
3244753ac610SCharles Manning *oh_name = 0;
3245753ac610SCharles Manning yaffs_strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
3246753ac610SCharles Manning }
3247862c93e9SJeroen Hofstee
3248862c93e9SJeroen Hofstee return;
3249753ac610SCharles Manning }
3250862c93e9SJeroen Hofstee #endif
3251862c93e9SJeroen Hofstee
3252862c93e9SJeroen Hofstee yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
32530e8cc8bdSWilliam Juul }
32540e8cc8bdSWilliam Juul
32550e8cc8bdSWilliam Juul /* UpdateObjectHeader updates the header on NAND for an object.
32560e8cc8bdSWilliam Juul * If name is not NULL, then that new name is used.
32570e8cc8bdSWilliam Juul */
yaffs_update_oh(struct yaffs_obj * in,const YCHAR * name,int force,int is_shrink,int shadows,struct yaffs_xattr_mod * xmod)3258753ac610SCharles Manning int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force,
3259753ac610SCharles Manning int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
32600e8cc8bdSWilliam Juul {
32610e8cc8bdSWilliam Juul
3262753ac610SCharles Manning struct yaffs_block_info *bi;
3263753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev;
3264753ac610SCharles Manning int prev_chunk_id;
3265753ac610SCharles Manning int ret_val = 0;
3266753ac610SCharles Manning int new_chunk_id;
3267753ac610SCharles Manning struct yaffs_ext_tags new_tags;
3268753ac610SCharles Manning struct yaffs_ext_tags old_tags;
3269753ac610SCharles Manning const YCHAR *alias = NULL;
3270753ac610SCharles Manning u8 *buffer = NULL;
3271753ac610SCharles Manning YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
3272753ac610SCharles Manning struct yaffs_obj_hdr *oh = NULL;
3273753ac610SCharles Manning loff_t file_size = 0;
32740e8cc8bdSWilliam Juul
3275753ac610SCharles Manning yaffs_strcpy(old_name, _Y("silly old name"));
32760e8cc8bdSWilliam Juul
3277753ac610SCharles Manning if (in->fake && in != dev->root_dir && !force && !xmod)
3278753ac610SCharles Manning return ret_val;
32790e8cc8bdSWilliam Juul
3280753ac610SCharles Manning yaffs_check_gc(dev, 0);
3281753ac610SCharles Manning yaffs_check_obj_details_loaded(in);
32820e8cc8bdSWilliam Juul
3283753ac610SCharles Manning buffer = yaffs_get_temp_buffer(in->my_dev);
3284753ac610SCharles Manning oh = (struct yaffs_obj_hdr *)buffer;
32850e8cc8bdSWilliam Juul
3286753ac610SCharles Manning prev_chunk_id = in->hdr_chunk;
32870e8cc8bdSWilliam Juul
3288753ac610SCharles Manning if (prev_chunk_id > 0) {
32898cc64bafSAnatolij Gustschin yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
3290753ac610SCharles Manning buffer, &old_tags);
32910e8cc8bdSWilliam Juul
3292753ac610SCharles Manning yaffs_verify_oh(in, oh, &old_tags, 0);
3293753ac610SCharles Manning memcpy(old_name, oh->name, sizeof(oh->name));
3294753ac610SCharles Manning memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr));
32950e8cc8bdSWilliam Juul } else {
3296753ac610SCharles Manning memset(buffer, 0xff, dev->data_bytes_per_chunk);
32970e8cc8bdSWilliam Juul }
32980e8cc8bdSWilliam Juul
3299753ac610SCharles Manning oh->type = in->variant_type;
3300753ac610SCharles Manning oh->yst_mode = in->yst_mode;
3301753ac610SCharles Manning oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
3302753ac610SCharles Manning
3303753ac610SCharles Manning yaffs_load_attribs_oh(oh, in);
3304753ac610SCharles Manning
3305753ac610SCharles Manning if (in->parent)
3306753ac610SCharles Manning oh->parent_obj_id = in->parent->obj_id;
3307753ac610SCharles Manning else
3308753ac610SCharles Manning oh->parent_obj_id = 0;
3309753ac610SCharles Manning
33100e8cc8bdSWilliam Juul if (name && *name) {
33110e8cc8bdSWilliam Juul memset(oh->name, 0, sizeof(oh->name));
3312753ac610SCharles Manning yaffs_load_oh_from_name(dev, oh->name, name);
3313753ac610SCharles Manning } else if (prev_chunk_id > 0) {
3314753ac610SCharles Manning memcpy(oh->name, old_name, sizeof(oh->name));
33150e8cc8bdSWilliam Juul } else {
33160e8cc8bdSWilliam Juul memset(oh->name, 0, sizeof(oh->name));
33170e8cc8bdSWilliam Juul }
33180e8cc8bdSWilliam Juul
3319753ac610SCharles Manning oh->is_shrink = is_shrink;
33200e8cc8bdSWilliam Juul
3321753ac610SCharles Manning switch (in->variant_type) {
33220e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_UNKNOWN:
33230e8cc8bdSWilliam Juul /* Should not happen */
33240e8cc8bdSWilliam Juul break;
33250e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_FILE:
3326753ac610SCharles Manning if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED &&
3327753ac610SCharles Manning oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED)
3328753ac610SCharles Manning file_size = in->variant.file_variant.file_size;
3329753ac610SCharles Manning yaffs_oh_size_load(oh, file_size);
33300e8cc8bdSWilliam Juul break;
33310e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_HARDLINK:
3332753ac610SCharles Manning oh->equiv_id = in->variant.hardlink_variant.equiv_id;
33330e8cc8bdSWilliam Juul break;
33340e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SPECIAL:
33350e8cc8bdSWilliam Juul /* Do nothing */
33360e8cc8bdSWilliam Juul break;
33370e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_DIRECTORY:
33380e8cc8bdSWilliam Juul /* Do nothing */
33390e8cc8bdSWilliam Juul break;
33400e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SYMLINK:
3341753ac610SCharles Manning alias = in->variant.symlink_variant.alias;
3342753ac610SCharles Manning if (!alias)
3343753ac610SCharles Manning alias = _Y("no alias");
3344753ac610SCharles Manning yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
33450e8cc8bdSWilliam Juul oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
33460e8cc8bdSWilliam Juul break;
33470e8cc8bdSWilliam Juul }
33480e8cc8bdSWilliam Juul
3349753ac610SCharles Manning /* process any xattrib modifications */
3350753ac610SCharles Manning if (xmod)
3351753ac610SCharles Manning yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
3352753ac610SCharles Manning
33530e8cc8bdSWilliam Juul /* Tags */
3354753ac610SCharles Manning memset(&new_tags, 0, sizeof(new_tags));
33550e8cc8bdSWilliam Juul in->serial++;
3356753ac610SCharles Manning new_tags.chunk_id = 0;
3357753ac610SCharles Manning new_tags.obj_id = in->obj_id;
3358753ac610SCharles Manning new_tags.serial_number = in->serial;
33590e8cc8bdSWilliam Juul
33600e8cc8bdSWilliam Juul /* Add extra info for file header */
3361753ac610SCharles Manning new_tags.extra_available = 1;
3362753ac610SCharles Manning new_tags.extra_parent_id = oh->parent_obj_id;
3363753ac610SCharles Manning new_tags.extra_file_size = file_size;
3364753ac610SCharles Manning new_tags.extra_is_shrink = oh->is_shrink;
3365753ac610SCharles Manning new_tags.extra_equiv_id = oh->equiv_id;
3366753ac610SCharles Manning new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
3367753ac610SCharles Manning new_tags.extra_obj_type = in->variant_type;
3368753ac610SCharles Manning yaffs_verify_oh(in, oh, &new_tags, 1);
33690e8cc8bdSWilliam Juul
33700e8cc8bdSWilliam Juul /* Create new chunk in NAND */
3371753ac610SCharles Manning new_chunk_id =
3372753ac610SCharles Manning yaffs_write_new_chunk(dev, buffer, &new_tags,
3373753ac610SCharles Manning (prev_chunk_id > 0) ? 1 : 0);
33740e8cc8bdSWilliam Juul
33750e8cc8bdSWilliam Juul if (buffer)
3376753ac610SCharles Manning yaffs_release_temp_buffer(dev, buffer);
33770e8cc8bdSWilliam Juul
3378753ac610SCharles Manning if (new_chunk_id < 0)
3379753ac610SCharles Manning return new_chunk_id;
33800e8cc8bdSWilliam Juul
3381753ac610SCharles Manning in->hdr_chunk = new_chunk_id;
33820e8cc8bdSWilliam Juul
3383753ac610SCharles Manning if (prev_chunk_id > 0)
3384753ac610SCharles Manning yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
33850e8cc8bdSWilliam Juul
3386753ac610SCharles Manning if (!yaffs_obj_cache_dirty(in))
3387753ac610SCharles Manning in->dirty = 0;
33880e8cc8bdSWilliam Juul
3389753ac610SCharles Manning /* If this was a shrink, then mark the block
3390753ac610SCharles Manning * that the chunk lives on */
3391753ac610SCharles Manning if (is_shrink) {
3392753ac610SCharles Manning bi = yaffs_get_block_info(in->my_dev,
3393753ac610SCharles Manning new_chunk_id /
3394753ac610SCharles Manning in->my_dev->param.chunks_per_block);
3395753ac610SCharles Manning bi->has_shrink_hdr = 1;
33960e8cc8bdSWilliam Juul }
33970e8cc8bdSWilliam Juul
33980e8cc8bdSWilliam Juul
3399753ac610SCharles Manning return new_chunk_id;
34000e8cc8bdSWilliam Juul }
34010e8cc8bdSWilliam Juul
34020e8cc8bdSWilliam Juul /*--------------------- File read/write ------------------------
34030e8cc8bdSWilliam Juul * Read and write have very similar structures.
34040e8cc8bdSWilliam Juul * In general the read/write has three parts to it
34050e8cc8bdSWilliam Juul * An incomplete chunk to start with (if the read/write is not chunk-aligned)
34060e8cc8bdSWilliam Juul * Some complete chunks
34070e8cc8bdSWilliam Juul * An incomplete chunk to end off with
34080e8cc8bdSWilliam Juul *
34090e8cc8bdSWilliam Juul * Curve-balls: the first chunk might also be the last chunk.
34100e8cc8bdSWilliam Juul */
34110e8cc8bdSWilliam Juul
yaffs_file_rd(struct yaffs_obj * in,u8 * buffer,loff_t offset,int n_bytes)3412753ac610SCharles Manning int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
34130e8cc8bdSWilliam Juul {
3414753ac610SCharles Manning int chunk;
3415753ac610SCharles Manning u32 start;
3416753ac610SCharles Manning int n_copy;
3417753ac610SCharles Manning int n = n_bytes;
3418753ac610SCharles Manning int n_done = 0;
3419753ac610SCharles Manning struct yaffs_cache *cache;
3420753ac610SCharles Manning struct yaffs_dev *dev;
34210e8cc8bdSWilliam Juul
3422753ac610SCharles Manning dev = in->my_dev;
34230e8cc8bdSWilliam Juul
34240e8cc8bdSWilliam Juul while (n > 0) {
3425753ac610SCharles Manning yaffs_addr_to_chunk(dev, offset, &chunk, &start);
34260e8cc8bdSWilliam Juul chunk++;
34270e8cc8bdSWilliam Juul
34280e8cc8bdSWilliam Juul /* OK now check for the curveball where the start and end are in
34290e8cc8bdSWilliam Juul * the same chunk.
34300e8cc8bdSWilliam Juul */
3431753ac610SCharles Manning if ((start + n) < dev->data_bytes_per_chunk)
3432753ac610SCharles Manning n_copy = n;
3433753ac610SCharles Manning else
3434753ac610SCharles Manning n_copy = dev->data_bytes_per_chunk - start;
34350e8cc8bdSWilliam Juul
3436753ac610SCharles Manning cache = yaffs_find_chunk_cache(in, chunk);
34370e8cc8bdSWilliam Juul
3438753ac610SCharles Manning /* If the chunk is already in the cache or it is less than
3439753ac610SCharles Manning * a whole chunk or we're using inband tags then use the cache
3440753ac610SCharles Manning * (if there is caching) else bypass the cache.
34410e8cc8bdSWilliam Juul */
3442753ac610SCharles Manning if (cache || n_copy != dev->data_bytes_per_chunk ||
3443753ac610SCharles Manning dev->param.inband_tags) {
3444753ac610SCharles Manning if (dev->param.n_caches > 0) {
34450e8cc8bdSWilliam Juul
3446753ac610SCharles Manning /* If we can't find the data in the cache,
3447753ac610SCharles Manning * then load it up. */
34480e8cc8bdSWilliam Juul
34490e8cc8bdSWilliam Juul if (!cache) {
3450753ac610SCharles Manning cache =
3451753ac610SCharles Manning yaffs_grab_chunk_cache(in->my_dev);
34520e8cc8bdSWilliam Juul cache->object = in;
3453753ac610SCharles Manning cache->chunk_id = chunk;
34540e8cc8bdSWilliam Juul cache->dirty = 0;
34550e8cc8bdSWilliam Juul cache->locked = 0;
3456753ac610SCharles Manning yaffs_rd_data_obj(in, chunk,
3457753ac610SCharles Manning cache->data);
3458753ac610SCharles Manning cache->n_bytes = 0;
34590e8cc8bdSWilliam Juul }
34600e8cc8bdSWilliam Juul
3461753ac610SCharles Manning yaffs_use_cache(dev, cache, 0);
34620e8cc8bdSWilliam Juul
34630e8cc8bdSWilliam Juul cache->locked = 1;
34640e8cc8bdSWilliam Juul
3465753ac610SCharles Manning memcpy(buffer, &cache->data[start], n_copy);
34660e8cc8bdSWilliam Juul
34670e8cc8bdSWilliam Juul cache->locked = 0;
34680e8cc8bdSWilliam Juul } else {
34690e8cc8bdSWilliam Juul /* Read into the local buffer then copy.. */
34700e8cc8bdSWilliam Juul
3471753ac610SCharles Manning u8 *local_buffer =
3472753ac610SCharles Manning yaffs_get_temp_buffer(dev);
3473753ac610SCharles Manning yaffs_rd_data_obj(in, chunk, local_buffer);
34740e8cc8bdSWilliam Juul
3475753ac610SCharles Manning memcpy(buffer, &local_buffer[start], n_copy);
3476753ac610SCharles Manning
3477753ac610SCharles Manning yaffs_release_temp_buffer(dev, local_buffer);
34780e8cc8bdSWilliam Juul }
34790e8cc8bdSWilliam Juul } else {
3480753ac610SCharles Manning /* A full chunk. Read directly into the buffer. */
3481753ac610SCharles Manning yaffs_rd_data_obj(in, chunk, buffer);
3482753ac610SCharles Manning }
3483753ac610SCharles Manning n -= n_copy;
3484753ac610SCharles Manning offset += n_copy;
3485753ac610SCharles Manning buffer += n_copy;
3486753ac610SCharles Manning n_done += n_copy;
3487753ac610SCharles Manning }
3488753ac610SCharles Manning return n_done;
34890e8cc8bdSWilliam Juul }
34900e8cc8bdSWilliam Juul
yaffs_do_file_wr(struct yaffs_obj * in,const u8 * buffer,loff_t offset,int n_bytes,int write_through)3491753ac610SCharles Manning int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
3492753ac610SCharles Manning int n_bytes, int write_through)
34930e8cc8bdSWilliam Juul {
34940e8cc8bdSWilliam Juul
3495753ac610SCharles Manning int chunk;
3496753ac610SCharles Manning u32 start;
3497753ac610SCharles Manning int n_copy;
3498753ac610SCharles Manning int n = n_bytes;
3499753ac610SCharles Manning int n_done = 0;
3500753ac610SCharles Manning int n_writeback;
3501753ac610SCharles Manning loff_t start_write = offset;
3502753ac610SCharles Manning int chunk_written = 0;
3503753ac610SCharles Manning u32 n_bytes_read;
3504753ac610SCharles Manning loff_t chunk_start;
3505753ac610SCharles Manning struct yaffs_dev *dev;
35060e8cc8bdSWilliam Juul
3507753ac610SCharles Manning dev = in->my_dev;
35080e8cc8bdSWilliam Juul
3509753ac610SCharles Manning while (n > 0 && chunk_written >= 0) {
3510753ac610SCharles Manning yaffs_addr_to_chunk(dev, offset, &chunk, &start);
35110e8cc8bdSWilliam Juul
3512753ac610SCharles Manning if (((loff_t)chunk) *
3513753ac610SCharles Manning dev->data_bytes_per_chunk + start != offset ||
3514753ac610SCharles Manning start >= dev->data_bytes_per_chunk) {
3515753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR,
3516753ac610SCharles Manning "AddrToChunk of offset %lld gives chunk %d start %d",
3517753ac610SCharles Manning offset, chunk, start);
3518753ac610SCharles Manning }
3519753ac610SCharles Manning chunk++; /* File pos to chunk in file offset */
35200e8cc8bdSWilliam Juul
35210e8cc8bdSWilliam Juul /* OK now check for the curveball where the start and end are in
35220e8cc8bdSWilliam Juul * the same chunk.
35230e8cc8bdSWilliam Juul */
35240e8cc8bdSWilliam Juul
3525753ac610SCharles Manning if ((start + n) < dev->data_bytes_per_chunk) {
3526753ac610SCharles Manning n_copy = n;
35270e8cc8bdSWilliam Juul
3528753ac610SCharles Manning /* Now calculate how many bytes to write back....
3529753ac610SCharles Manning * If we're overwriting and not writing to then end of
3530753ac610SCharles Manning * file then we need to write back as much as was there
3531753ac610SCharles Manning * before.
35320e8cc8bdSWilliam Juul */
35330e8cc8bdSWilliam Juul
3534753ac610SCharles Manning chunk_start = (((loff_t)(chunk - 1)) *
3535753ac610SCharles Manning dev->data_bytes_per_chunk);
35360e8cc8bdSWilliam Juul
3537753ac610SCharles Manning if (chunk_start > in->variant.file_variant.file_size)
3538753ac610SCharles Manning n_bytes_read = 0; /* Past end of file */
3539753ac610SCharles Manning else
3540753ac610SCharles Manning n_bytes_read =
3541753ac610SCharles Manning in->variant.file_variant.file_size -
3542753ac610SCharles Manning chunk_start;
35430e8cc8bdSWilliam Juul
3544753ac610SCharles Manning if (n_bytes_read > dev->data_bytes_per_chunk)
3545753ac610SCharles Manning n_bytes_read = dev->data_bytes_per_chunk;
3546753ac610SCharles Manning
3547753ac610SCharles Manning n_writeback =
3548753ac610SCharles Manning (n_bytes_read >
3549753ac610SCharles Manning (start + n)) ? n_bytes_read : (start + n);
3550753ac610SCharles Manning
3551753ac610SCharles Manning if (n_writeback < 0 ||
3552753ac610SCharles Manning n_writeback > dev->data_bytes_per_chunk)
3553753ac610SCharles Manning BUG();
35540e8cc8bdSWilliam Juul
35550e8cc8bdSWilliam Juul } else {
3556753ac610SCharles Manning n_copy = dev->data_bytes_per_chunk - start;
3557753ac610SCharles Manning n_writeback = dev->data_bytes_per_chunk;
35580e8cc8bdSWilliam Juul }
35590e8cc8bdSWilliam Juul
3560753ac610SCharles Manning if (n_copy != dev->data_bytes_per_chunk ||
3561753ac610SCharles Manning dev->param.inband_tags) {
3562753ac610SCharles Manning /* An incomplete start or end chunk (or maybe both
3563753ac610SCharles Manning * start and end chunk), or we're using inband tags,
3564753ac610SCharles Manning * so we want to use the cache buffers.
3565753ac610SCharles Manning */
3566753ac610SCharles Manning if (dev->param.n_caches > 0) {
3567753ac610SCharles Manning struct yaffs_cache *cache;
35680e8cc8bdSWilliam Juul
3569753ac610SCharles Manning /* If we can't find the data in the cache, then
3570753ac610SCharles Manning * load the cache */
3571753ac610SCharles Manning cache = yaffs_find_chunk_cache(in, chunk);
3572753ac610SCharles Manning
3573753ac610SCharles Manning if (!cache &&
3574753ac610SCharles Manning yaffs_check_alloc_available(dev, 1)) {
3575753ac610SCharles Manning cache = yaffs_grab_chunk_cache(dev);
35760e8cc8bdSWilliam Juul cache->object = in;
3577753ac610SCharles Manning cache->chunk_id = chunk;
35780e8cc8bdSWilliam Juul cache->dirty = 0;
35790e8cc8bdSWilliam Juul cache->locked = 0;
3580753ac610SCharles Manning yaffs_rd_data_obj(in, chunk,
3581753ac610SCharles Manning cache->data);
3582753ac610SCharles Manning } else if (cache &&
35830e8cc8bdSWilliam Juul !cache->dirty &&
3584753ac610SCharles Manning !yaffs_check_alloc_available(dev,
3585753ac610SCharles Manning 1)) {
3586753ac610SCharles Manning /* Drop the cache if it was a read cache
3587753ac610SCharles Manning * item and no space check has been made
3588753ac610SCharles Manning * for it.
35890e8cc8bdSWilliam Juul */
35900e8cc8bdSWilliam Juul cache = NULL;
35910e8cc8bdSWilliam Juul }
35920e8cc8bdSWilliam Juul
35930e8cc8bdSWilliam Juul if (cache) {
3594753ac610SCharles Manning yaffs_use_cache(dev, cache, 1);
35950e8cc8bdSWilliam Juul cache->locked = 1;
35960e8cc8bdSWilliam Juul
35970e8cc8bdSWilliam Juul memcpy(&cache->data[start], buffer,
3598753ac610SCharles Manning n_copy);
35990e8cc8bdSWilliam Juul
36000e8cc8bdSWilliam Juul cache->locked = 0;
3601753ac610SCharles Manning cache->n_bytes = n_writeback;
36020e8cc8bdSWilliam Juul
3603753ac610SCharles Manning if (write_through) {
3604753ac610SCharles Manning chunk_written =
3605753ac610SCharles Manning yaffs_wr_data_obj
36060e8cc8bdSWilliam Juul (cache->object,
3607753ac610SCharles Manning cache->chunk_id,
3608753ac610SCharles Manning cache->data,
3609753ac610SCharles Manning cache->n_bytes, 1);
36100e8cc8bdSWilliam Juul cache->dirty = 0;
36110e8cc8bdSWilliam Juul }
36120e8cc8bdSWilliam Juul } else {
3613753ac610SCharles Manning chunk_written = -1; /* fail write */
36140e8cc8bdSWilliam Juul }
36150e8cc8bdSWilliam Juul } else {
3616753ac610SCharles Manning /* An incomplete start or end chunk (or maybe
3617753ac610SCharles Manning * both start and end chunk). Read into the
3618753ac610SCharles Manning * local buffer then copy over and write back.
36190e8cc8bdSWilliam Juul */
36200e8cc8bdSWilliam Juul
3621753ac610SCharles Manning u8 *local_buffer = yaffs_get_temp_buffer(dev);
36220e8cc8bdSWilliam Juul
3623753ac610SCharles Manning yaffs_rd_data_obj(in, chunk, local_buffer);
3624753ac610SCharles Manning memcpy(&local_buffer[start], buffer, n_copy);
36250e8cc8bdSWilliam Juul
3626753ac610SCharles Manning chunk_written =
3627753ac610SCharles Manning yaffs_wr_data_obj(in, chunk,
3628753ac610SCharles Manning local_buffer,
3629753ac610SCharles Manning n_writeback, 0);
36300e8cc8bdSWilliam Juul
3631753ac610SCharles Manning yaffs_release_temp_buffer(dev, local_buffer);
36320e8cc8bdSWilliam Juul }
36330e8cc8bdSWilliam Juul } else {
3634753ac610SCharles Manning /* A full chunk. Write directly from the buffer. */
36350e8cc8bdSWilliam Juul
3636753ac610SCharles Manning chunk_written =
3637753ac610SCharles Manning yaffs_wr_data_obj(in, chunk, buffer,
3638753ac610SCharles Manning dev->data_bytes_per_chunk, 0);
3639753ac610SCharles Manning
3640753ac610SCharles Manning /* Since we've overwritten the cached data,
3641753ac610SCharles Manning * we better invalidate it. */
3642753ac610SCharles Manning yaffs_invalidate_chunk_cache(in, chunk);
36430e8cc8bdSWilliam Juul }
36440e8cc8bdSWilliam Juul
3645753ac610SCharles Manning if (chunk_written >= 0) {
3646753ac610SCharles Manning n -= n_copy;
3647753ac610SCharles Manning offset += n_copy;
3648753ac610SCharles Manning buffer += n_copy;
3649753ac610SCharles Manning n_done += n_copy;
36500e8cc8bdSWilliam Juul }
36510e8cc8bdSWilliam Juul }
36520e8cc8bdSWilliam Juul
36530e8cc8bdSWilliam Juul /* Update file object */
36540e8cc8bdSWilliam Juul
3655753ac610SCharles Manning if ((start_write + n_done) > in->variant.file_variant.file_size)
3656753ac610SCharles Manning in->variant.file_variant.file_size = (start_write + n_done);
36570e8cc8bdSWilliam Juul
36580e8cc8bdSWilliam Juul in->dirty = 1;
3659753ac610SCharles Manning return n_done;
36600e8cc8bdSWilliam Juul }
36610e8cc8bdSWilliam Juul
yaffs_wr_file(struct yaffs_obj * in,const u8 * buffer,loff_t offset,int n_bytes,int write_through)3662753ac610SCharles Manning int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
3663753ac610SCharles Manning int n_bytes, int write_through)
3664753ac610SCharles Manning {
3665753ac610SCharles Manning yaffs2_handle_hole(in, offset);
3666753ac610SCharles Manning return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
3667753ac610SCharles Manning }
36680e8cc8bdSWilliam Juul
36690e8cc8bdSWilliam Juul /* ---------------------- File resizing stuff ------------------ */
36700e8cc8bdSWilliam Juul
yaffs_prune_chunks(struct yaffs_obj * in,loff_t new_size)3671753ac610SCharles Manning static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size)
36720e8cc8bdSWilliam Juul {
36730e8cc8bdSWilliam Juul
3674753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev;
3675753ac610SCharles Manning loff_t old_size = in->variant.file_variant.file_size;
36760e8cc8bdSWilliam Juul int i;
3677753ac610SCharles Manning int chunk_id;
3678753ac610SCharles Manning u32 dummy;
3679753ac610SCharles Manning int last_del;
3680753ac610SCharles Manning int start_del;
3681753ac610SCharles Manning
3682753ac610SCharles Manning if (old_size > 0)
3683753ac610SCharles Manning yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
3684753ac610SCharles Manning else
3685753ac610SCharles Manning last_del = 0;
3686753ac610SCharles Manning
3687753ac610SCharles Manning yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
3688753ac610SCharles Manning &start_del, &dummy);
3689753ac610SCharles Manning last_del++;
3690753ac610SCharles Manning start_del++;
36910e8cc8bdSWilliam Juul
36920e8cc8bdSWilliam Juul /* Delete backwards so that we don't end up with holes if
36930e8cc8bdSWilliam Juul * power is lost part-way through the operation.
36940e8cc8bdSWilliam Juul */
3695753ac610SCharles Manning for (i = last_del; i >= start_del; i--) {
36960e8cc8bdSWilliam Juul /* NB this could be optimised somewhat,
36970e8cc8bdSWilliam Juul * eg. could retrieve the tags and write them without
3698753ac610SCharles Manning * using yaffs_chunk_del
36990e8cc8bdSWilliam Juul */
37000e8cc8bdSWilliam Juul
3701753ac610SCharles Manning chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
3702753ac610SCharles Manning
3703753ac610SCharles Manning if (chunk_id < 1)
3704753ac610SCharles Manning continue;
3705753ac610SCharles Manning
3706753ac610SCharles Manning if (chunk_id <
3707753ac610SCharles Manning (dev->internal_start_block * dev->param.chunks_per_block) ||
3708753ac610SCharles Manning chunk_id >=
3709753ac610SCharles Manning ((dev->internal_end_block + 1) *
3710753ac610SCharles Manning dev->param.chunks_per_block)) {
3711753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
3712753ac610SCharles Manning "Found daft chunk_id %d for %d",
3713753ac610SCharles Manning chunk_id, i);
37140e8cc8bdSWilliam Juul } else {
3715753ac610SCharles Manning in->n_data_chunks--;
3716753ac610SCharles Manning yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
37170e8cc8bdSWilliam Juul }
37180e8cc8bdSWilliam Juul }
37190e8cc8bdSWilliam Juul }
37200e8cc8bdSWilliam Juul
yaffs_resize_file_down(struct yaffs_obj * obj,loff_t new_size)3721753ac610SCharles Manning void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
37220e8cc8bdSWilliam Juul {
3723753ac610SCharles Manning int new_full;
3724753ac610SCharles Manning u32 new_partial;
3725753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev;
37260e8cc8bdSWilliam Juul
3727753ac610SCharles Manning yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
37280e8cc8bdSWilliam Juul
3729753ac610SCharles Manning yaffs_prune_chunks(obj, new_size);
37300e8cc8bdSWilliam Juul
3731753ac610SCharles Manning if (new_partial != 0) {
3732753ac610SCharles Manning int last_chunk = 1 + new_full;
3733753ac610SCharles Manning u8 *local_buffer = yaffs_get_temp_buffer(dev);
37340e8cc8bdSWilliam Juul
3735753ac610SCharles Manning /* Rewrite the last chunk with its new size and zero pad */
3736753ac610SCharles Manning yaffs_rd_data_obj(obj, last_chunk, local_buffer);
3737753ac610SCharles Manning memset(local_buffer + new_partial, 0,
3738753ac610SCharles Manning dev->data_bytes_per_chunk - new_partial);
37390e8cc8bdSWilliam Juul
3740753ac610SCharles Manning yaffs_wr_data_obj(obj, last_chunk, local_buffer,
3741753ac610SCharles Manning new_partial, 1);
37420e8cc8bdSWilliam Juul
3743753ac610SCharles Manning yaffs_release_temp_buffer(dev, local_buffer);
37440e8cc8bdSWilliam Juul }
37450e8cc8bdSWilliam Juul
3746753ac610SCharles Manning obj->variant.file_variant.file_size = new_size;
3747753ac610SCharles Manning
3748753ac610SCharles Manning yaffs_prune_tree(dev, &obj->variant.file_variant);
37490e8cc8bdSWilliam Juul }
37500e8cc8bdSWilliam Juul
yaffs_resize_file(struct yaffs_obj * in,loff_t new_size)3751753ac610SCharles Manning int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
3752753ac610SCharles Manning {
3753753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev;
3754753ac610SCharles Manning loff_t old_size = in->variant.file_variant.file_size;
37550e8cc8bdSWilliam Juul
3756753ac610SCharles Manning yaffs_flush_file_cache(in);
3757753ac610SCharles Manning yaffs_invalidate_whole_cache(in);
37580e8cc8bdSWilliam Juul
3759753ac610SCharles Manning yaffs_check_gc(dev, 0);
37600e8cc8bdSWilliam Juul
3761753ac610SCharles Manning if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
3762753ac610SCharles Manning return YAFFS_FAIL;
37630e8cc8bdSWilliam Juul
3764753ac610SCharles Manning if (new_size == old_size)
3765753ac610SCharles Manning return YAFFS_OK;
37660e8cc8bdSWilliam Juul
3767753ac610SCharles Manning if (new_size > old_size) {
3768753ac610SCharles Manning yaffs2_handle_hole(in, new_size);
3769753ac610SCharles Manning in->variant.file_variant.file_size = new_size;
37700e8cc8bdSWilliam Juul } else {
3771753ac610SCharles Manning /* new_size < old_size */
3772753ac610SCharles Manning yaffs_resize_file_down(in, new_size);
37730e8cc8bdSWilliam Juul }
37740e8cc8bdSWilliam Juul
3775753ac610SCharles Manning /* Write a new object header to reflect the resize.
37760e8cc8bdSWilliam Juul * show we've shrunk the file, if need be
3777753ac610SCharles Manning * Do this only if the file is not in the deleted directories
3778753ac610SCharles Manning * and is not shadowed.
37790e8cc8bdSWilliam Juul */
3780753ac610SCharles Manning if (in->parent &&
3781753ac610SCharles Manning !in->is_shadowed &&
3782753ac610SCharles Manning in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
3783753ac610SCharles Manning in->parent->obj_id != YAFFS_OBJECTID_DELETED)
3784753ac610SCharles Manning yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
37850e8cc8bdSWilliam Juul
37860e8cc8bdSWilliam Juul return YAFFS_OK;
37870e8cc8bdSWilliam Juul }
37880e8cc8bdSWilliam Juul
yaffs_flush_file(struct yaffs_obj * in,int update_time,int data_sync)3789753ac610SCharles Manning int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync)
37900e8cc8bdSWilliam Juul {
3791753ac610SCharles Manning if (!in->dirty)
37920e8cc8bdSWilliam Juul return YAFFS_OK;
37930e8cc8bdSWilliam Juul
3794753ac610SCharles Manning yaffs_flush_file_cache(in);
3795753ac610SCharles Manning
3796753ac610SCharles Manning if (data_sync)
3797753ac610SCharles Manning return YAFFS_OK;
3798753ac610SCharles Manning
3799753ac610SCharles Manning if (update_time)
3800753ac610SCharles Manning yaffs_load_current_time(in, 0, 0);
3801753ac610SCharles Manning
3802753ac610SCharles Manning return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
3803753ac610SCharles Manning YAFFS_OK : YAFFS_FAIL;
38040e8cc8bdSWilliam Juul }
38050e8cc8bdSWilliam Juul
3806753ac610SCharles Manning
3807753ac610SCharles Manning /* yaffs_del_file deletes the whole file data
38080e8cc8bdSWilliam Juul * and the inode associated with the file.
38090e8cc8bdSWilliam Juul * It does not delete the links associated with the file.
38100e8cc8bdSWilliam Juul */
yaffs_unlink_file_if_needed(struct yaffs_obj * in)3811753ac610SCharles Manning static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
38120e8cc8bdSWilliam Juul {
3813753ac610SCharles Manning int ret_val;
3814753ac610SCharles Manning int del_now = 0;
3815753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev;
38160e8cc8bdSWilliam Juul
3817753ac610SCharles Manning if (!in->my_inode)
3818753ac610SCharles Manning del_now = 1;
38190e8cc8bdSWilliam Juul
3820753ac610SCharles Manning if (del_now) {
3821753ac610SCharles Manning ret_val =
3822753ac610SCharles Manning yaffs_change_obj_name(in, in->my_dev->del_dir,
3823753ac610SCharles Manning _Y("deleted"), 0, 0);
3824753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING,
3825753ac610SCharles Manning "yaffs: immediate deletion of file %d",
3826753ac610SCharles Manning in->obj_id);
38270e8cc8bdSWilliam Juul in->deleted = 1;
3828753ac610SCharles Manning in->my_dev->n_deleted_files++;
3829753ac610SCharles Manning if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3830753ac610SCharles Manning yaffs_resize_file(in, 0);
3831753ac610SCharles Manning yaffs_soft_del_file(in);
38320e8cc8bdSWilliam Juul } else {
3833753ac610SCharles Manning ret_val =
3834753ac610SCharles Manning yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
3835753ac610SCharles Manning _Y("unlinked"), 0, 0);
3836753ac610SCharles Manning }
3837753ac610SCharles Manning return ret_val;
38380e8cc8bdSWilliam Juul }
38390e8cc8bdSWilliam Juul
yaffs_del_file(struct yaffs_obj * in)3840753ac610SCharles Manning int yaffs_del_file(struct yaffs_obj *in)
38410e8cc8bdSWilliam Juul {
3842753ac610SCharles Manning int ret_val = YAFFS_OK;
3843753ac610SCharles Manning int deleted; /* Need to cache value on stack if in is freed */
3844753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev;
38450e8cc8bdSWilliam Juul
3846753ac610SCharles Manning if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3847753ac610SCharles Manning yaffs_resize_file(in, 0);
3848753ac610SCharles Manning
3849753ac610SCharles Manning if (in->n_data_chunks > 0) {
3850753ac610SCharles Manning /* Use soft deletion if there is data in the file.
3851753ac610SCharles Manning * That won't be the case if it has been resized to zero.
3852753ac610SCharles Manning */
3853753ac610SCharles Manning if (!in->unlinked)
3854753ac610SCharles Manning ret_val = yaffs_unlink_file_if_needed(in);
3855753ac610SCharles Manning
3856753ac610SCharles Manning deleted = in->deleted;
3857753ac610SCharles Manning
3858753ac610SCharles Manning if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
38590e8cc8bdSWilliam Juul in->deleted = 1;
3860753ac610SCharles Manning deleted = 1;
3861753ac610SCharles Manning in->my_dev->n_deleted_files++;
3862753ac610SCharles Manning yaffs_soft_del_file(in);
38630e8cc8bdSWilliam Juul }
3864753ac610SCharles Manning return deleted ? YAFFS_OK : YAFFS_FAIL;
38650e8cc8bdSWilliam Juul } else {
38660e8cc8bdSWilliam Juul /* The file has no data chunks so we toss it immediately */
3867753ac610SCharles Manning yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
3868753ac610SCharles Manning in->variant.file_variant.top = NULL;
3869753ac610SCharles Manning yaffs_generic_obj_del(in);
38700e8cc8bdSWilliam Juul
38710e8cc8bdSWilliam Juul return YAFFS_OK;
38720e8cc8bdSWilliam Juul }
38730e8cc8bdSWilliam Juul }
38740e8cc8bdSWilliam Juul
yaffs_is_non_empty_dir(struct yaffs_obj * obj)3875753ac610SCharles Manning int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
3876753ac610SCharles Manning {
3877753ac610SCharles Manning return (obj &&
3878753ac610SCharles Manning obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
3879753ac610SCharles Manning !(list_empty(&obj->variant.dir_variant.children));
3880753ac610SCharles Manning }
3881753ac610SCharles Manning
yaffs_del_dir(struct yaffs_obj * obj)3882753ac610SCharles Manning static int yaffs_del_dir(struct yaffs_obj *obj)
38830e8cc8bdSWilliam Juul {
38840e8cc8bdSWilliam Juul /* First check that the directory is empty. */
3885753ac610SCharles Manning if (yaffs_is_non_empty_dir(obj))
38860e8cc8bdSWilliam Juul return YAFFS_FAIL;
38870e8cc8bdSWilliam Juul
3888753ac610SCharles Manning return yaffs_generic_obj_del(obj);
38890e8cc8bdSWilliam Juul }
38900e8cc8bdSWilliam Juul
yaffs_del_symlink(struct yaffs_obj * in)3891753ac610SCharles Manning static int yaffs_del_symlink(struct yaffs_obj *in)
38920e8cc8bdSWilliam Juul {
3893753ac610SCharles Manning kfree(in->variant.symlink_variant.alias);
3894753ac610SCharles Manning in->variant.symlink_variant.alias = NULL;
38950e8cc8bdSWilliam Juul
3896753ac610SCharles Manning return yaffs_generic_obj_del(in);
38970e8cc8bdSWilliam Juul }
38980e8cc8bdSWilliam Juul
yaffs_del_link(struct yaffs_obj * in)3899753ac610SCharles Manning static int yaffs_del_link(struct yaffs_obj *in)
39000e8cc8bdSWilliam Juul {
3901753ac610SCharles Manning /* remove this hardlink from the list associated with the equivalent
39020e8cc8bdSWilliam Juul * object
39030e8cc8bdSWilliam Juul */
3904753ac610SCharles Manning list_del_init(&in->hard_links);
3905753ac610SCharles Manning return yaffs_generic_obj_del(in);
39060e8cc8bdSWilliam Juul }
39070e8cc8bdSWilliam Juul
yaffs_del_obj(struct yaffs_obj * obj)3908753ac610SCharles Manning int yaffs_del_obj(struct yaffs_obj *obj)
39090e8cc8bdSWilliam Juul {
3910753ac610SCharles Manning int ret_val = -1;
3911753ac610SCharles Manning
3912753ac610SCharles Manning switch (obj->variant_type) {
39130e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_FILE:
3914753ac610SCharles Manning ret_val = yaffs_del_file(obj);
39150e8cc8bdSWilliam Juul break;
39160e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_DIRECTORY:
3917753ac610SCharles Manning if (!list_empty(&obj->variant.dir_variant.dirty)) {
3918753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_BACKGROUND,
3919753ac610SCharles Manning "Remove object %d from dirty directories",
3920753ac610SCharles Manning obj->obj_id);
3921753ac610SCharles Manning list_del_init(&obj->variant.dir_variant.dirty);
3922753ac610SCharles Manning }
3923753ac610SCharles Manning return yaffs_del_dir(obj);
39240e8cc8bdSWilliam Juul break;
39250e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SYMLINK:
3926753ac610SCharles Manning ret_val = yaffs_del_symlink(obj);
39270e8cc8bdSWilliam Juul break;
39280e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_HARDLINK:
3929753ac610SCharles Manning ret_val = yaffs_del_link(obj);
39300e8cc8bdSWilliam Juul break;
39310e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SPECIAL:
3932753ac610SCharles Manning ret_val = yaffs_generic_obj_del(obj);
39330e8cc8bdSWilliam Juul break;
39340e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_UNKNOWN:
3935753ac610SCharles Manning ret_val = 0;
39360e8cc8bdSWilliam Juul break; /* should not happen. */
39370e8cc8bdSWilliam Juul }
3938753ac610SCharles Manning return ret_val;
39390e8cc8bdSWilliam Juul }
39400e8cc8bdSWilliam Juul
yaffs_unlink_worker(struct yaffs_obj * obj)3941753ac610SCharles Manning static int yaffs_unlink_worker(struct yaffs_obj *obj)
39420e8cc8bdSWilliam Juul {
3943753ac610SCharles Manning int del_now = 0;
39440e8cc8bdSWilliam Juul
3945753ac610SCharles Manning if (!obj)
3946753ac610SCharles Manning return YAFFS_FAIL;
3947753ac610SCharles Manning
3948753ac610SCharles Manning if (!obj->my_inode)
3949753ac610SCharles Manning del_now = 1;
3950753ac610SCharles Manning
3951753ac610SCharles Manning yaffs_update_parent(obj->parent);
3952753ac610SCharles Manning
3953753ac610SCharles Manning if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
3954753ac610SCharles Manning return yaffs_del_link(obj);
3955753ac610SCharles Manning } else if (!list_empty(&obj->hard_links)) {
39560e8cc8bdSWilliam Juul /* Curve ball: We're unlinking an object that has a hardlink.
39570e8cc8bdSWilliam Juul *
39580e8cc8bdSWilliam Juul * This problem arises because we are not strictly following
39590e8cc8bdSWilliam Juul * The Linux link/inode model.
39600e8cc8bdSWilliam Juul *
39610e8cc8bdSWilliam Juul * We can't really delete the object.
39620e8cc8bdSWilliam Juul * Instead, we do the following:
39630e8cc8bdSWilliam Juul * - Select a hardlink.
39640e8cc8bdSWilliam Juul * - Unhook it from the hard links
3965753ac610SCharles Manning * - Move it from its parent directory so that the rename works.
39660e8cc8bdSWilliam Juul * - Rename the object to the hardlink's name.
39670e8cc8bdSWilliam Juul * - Delete the hardlink
39680e8cc8bdSWilliam Juul */
39690e8cc8bdSWilliam Juul
3970753ac610SCharles Manning struct yaffs_obj *hl;
3971753ac610SCharles Manning struct yaffs_obj *parent;
3972753ac610SCharles Manning int ret_val;
39730e8cc8bdSWilliam Juul YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
39740e8cc8bdSWilliam Juul
3975753ac610SCharles Manning hl = list_entry(obj->hard_links.next, struct yaffs_obj,
3976753ac610SCharles Manning hard_links);
39770e8cc8bdSWilliam Juul
3978753ac610SCharles Manning yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
3979753ac610SCharles Manning parent = hl->parent;
39800e8cc8bdSWilliam Juul
3981753ac610SCharles Manning list_del_init(&hl->hard_links);
39820e8cc8bdSWilliam Juul
3983753ac610SCharles Manning yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
39840e8cc8bdSWilliam Juul
3985753ac610SCharles Manning ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
39860e8cc8bdSWilliam Juul
3987753ac610SCharles Manning if (ret_val == YAFFS_OK)
3988753ac610SCharles Manning ret_val = yaffs_generic_obj_del(hl);
3989753ac610SCharles Manning
3990753ac610SCharles Manning return ret_val;
3991753ac610SCharles Manning
3992753ac610SCharles Manning } else if (del_now) {
3993753ac610SCharles Manning switch (obj->variant_type) {
39940e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_FILE:
3995753ac610SCharles Manning return yaffs_del_file(obj);
39960e8cc8bdSWilliam Juul break;
39970e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_DIRECTORY:
3998753ac610SCharles Manning list_del_init(&obj->variant.dir_variant.dirty);
3999753ac610SCharles Manning return yaffs_del_dir(obj);
40000e8cc8bdSWilliam Juul break;
40010e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SYMLINK:
4002753ac610SCharles Manning return yaffs_del_symlink(obj);
40030e8cc8bdSWilliam Juul break;
40040e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SPECIAL:
4005753ac610SCharles Manning return yaffs_generic_obj_del(obj);
40060e8cc8bdSWilliam Juul break;
40070e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_HARDLINK:
40080e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_UNKNOWN:
40090e8cc8bdSWilliam Juul default:
40100e8cc8bdSWilliam Juul return YAFFS_FAIL;
40110e8cc8bdSWilliam Juul }
4012753ac610SCharles Manning } else if (yaffs_is_non_empty_dir(obj)) {
4013753ac610SCharles Manning return YAFFS_FAIL;
4014753ac610SCharles Manning } else {
4015753ac610SCharles Manning return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
4016753ac610SCharles Manning _Y("unlinked"), 0, 0);
40170e8cc8bdSWilliam Juul }
40180e8cc8bdSWilliam Juul }
40190e8cc8bdSWilliam Juul
yaffs_unlink_obj(struct yaffs_obj * obj)4020753ac610SCharles Manning static int yaffs_unlink_obj(struct yaffs_obj *obj)
40210e8cc8bdSWilliam Juul {
4022753ac610SCharles Manning if (obj && obj->unlink_allowed)
4023753ac610SCharles Manning return yaffs_unlink_worker(obj);
40240e8cc8bdSWilliam Juul
40250e8cc8bdSWilliam Juul return YAFFS_FAIL;
40260e8cc8bdSWilliam Juul }
40270e8cc8bdSWilliam Juul
yaffs_unlinker(struct yaffs_obj * dir,const YCHAR * name)4028753ac610SCharles Manning int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name)
4029753ac610SCharles Manning {
4030753ac610SCharles Manning struct yaffs_obj *obj;
4031753ac610SCharles Manning
4032753ac610SCharles Manning obj = yaffs_find_by_name(dir, name);
4033753ac610SCharles Manning return yaffs_unlink_obj(obj);
4034753ac610SCharles Manning }
4035753ac610SCharles Manning
4036753ac610SCharles Manning /* Note:
4037753ac610SCharles Manning * If old_name is NULL then we take old_dir as the object to be renamed.
4038753ac610SCharles Manning */
yaffs_rename_obj(struct yaffs_obj * old_dir,const YCHAR * old_name,struct yaffs_obj * new_dir,const YCHAR * new_name)4039753ac610SCharles Manning int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
4040753ac610SCharles Manning struct yaffs_obj *new_dir, const YCHAR *new_name)
4041753ac610SCharles Manning {
4042753ac610SCharles Manning struct yaffs_obj *obj = NULL;
4043753ac610SCharles Manning struct yaffs_obj *existing_target = NULL;
4044753ac610SCharles Manning int force = 0;
4045753ac610SCharles Manning int result;
4046753ac610SCharles Manning struct yaffs_dev *dev;
4047753ac610SCharles Manning
4048753ac610SCharles Manning if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4049753ac610SCharles Manning BUG();
4050753ac610SCharles Manning return YAFFS_FAIL;
4051753ac610SCharles Manning }
4052753ac610SCharles Manning if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4053753ac610SCharles Manning BUG();
4054753ac610SCharles Manning return YAFFS_FAIL;
4055753ac610SCharles Manning }
4056753ac610SCharles Manning
4057753ac610SCharles Manning dev = old_dir->my_dev;
4058753ac610SCharles Manning
4059753ac610SCharles Manning #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
4060753ac610SCharles Manning /* Special case for case insemsitive systems.
4061753ac610SCharles Manning * While look-up is case insensitive, the name isn't.
4062753ac610SCharles Manning * Therefore we might want to change x.txt to X.txt
4063753ac610SCharles Manning */
4064753ac610SCharles Manning if (old_dir == new_dir &&
4065753ac610SCharles Manning old_name && new_name &&
4066753ac610SCharles Manning yaffs_strcmp(old_name, new_name) == 0)
4067753ac610SCharles Manning force = 1;
4068753ac610SCharles Manning #endif
4069753ac610SCharles Manning
4070753ac610SCharles Manning if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
4071753ac610SCharles Manning YAFFS_MAX_NAME_LENGTH)
4072753ac610SCharles Manning /* ENAMETOOLONG */
4073753ac610SCharles Manning return YAFFS_FAIL;
4074753ac610SCharles Manning
4075753ac610SCharles Manning if (old_name)
4076753ac610SCharles Manning obj = yaffs_find_by_name(old_dir, old_name);
4077753ac610SCharles Manning else{
4078753ac610SCharles Manning obj = old_dir;
4079753ac610SCharles Manning old_dir = obj->parent;
4080753ac610SCharles Manning }
4081753ac610SCharles Manning
4082753ac610SCharles Manning if (obj && obj->rename_allowed) {
4083753ac610SCharles Manning /* Now handle an existing target, if there is one */
4084753ac610SCharles Manning existing_target = yaffs_find_by_name(new_dir, new_name);
4085753ac610SCharles Manning if (yaffs_is_non_empty_dir(existing_target)) {
4086753ac610SCharles Manning return YAFFS_FAIL; /* ENOTEMPTY */
4087753ac610SCharles Manning } else if (existing_target && existing_target != obj) {
4088753ac610SCharles Manning /* Nuke the target first, using shadowing,
4089753ac610SCharles Manning * but only if it isn't the same object.
4090753ac610SCharles Manning *
4091753ac610SCharles Manning * Note we must disable gc here otherwise it can mess
4092753ac610SCharles Manning * up the shadowing.
4093753ac610SCharles Manning *
4094753ac610SCharles Manning */
4095753ac610SCharles Manning dev->gc_disable = 1;
4096753ac610SCharles Manning yaffs_change_obj_name(obj, new_dir, new_name, force,
4097753ac610SCharles Manning existing_target->obj_id);
4098753ac610SCharles Manning existing_target->is_shadowed = 1;
4099753ac610SCharles Manning yaffs_unlink_obj(existing_target);
4100753ac610SCharles Manning dev->gc_disable = 0;
4101753ac610SCharles Manning }
4102753ac610SCharles Manning
4103753ac610SCharles Manning result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
4104753ac610SCharles Manning
4105753ac610SCharles Manning yaffs_update_parent(old_dir);
4106753ac610SCharles Manning if (new_dir != old_dir)
4107753ac610SCharles Manning yaffs_update_parent(new_dir);
4108753ac610SCharles Manning
4109753ac610SCharles Manning return result;
4110753ac610SCharles Manning }
4111753ac610SCharles Manning return YAFFS_FAIL;
41120e8cc8bdSWilliam Juul }
41130e8cc8bdSWilliam Juul
41140e8cc8bdSWilliam Juul /*----------------------- Initialisation Scanning ---------------------- */
41150e8cc8bdSWilliam Juul
yaffs_handle_shadowed_obj(struct yaffs_dev * dev,int obj_id,int backward_scanning)4116753ac610SCharles Manning void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
4117753ac610SCharles Manning int backward_scanning)
41180e8cc8bdSWilliam Juul {
4119753ac610SCharles Manning struct yaffs_obj *obj;
41200e8cc8bdSWilliam Juul
4121753ac610SCharles Manning if (backward_scanning) {
41220e8cc8bdSWilliam Juul /* Handle YAFFS2 case (backward scanning)
41230e8cc8bdSWilliam Juul * If the shadowed object exists then ignore.
41240e8cc8bdSWilliam Juul */
4125753ac610SCharles Manning obj = yaffs_find_by_number(dev, obj_id);
4126753ac610SCharles Manning if (obj)
41270e8cc8bdSWilliam Juul return;
41280e8cc8bdSWilliam Juul }
41290e8cc8bdSWilliam Juul
4130753ac610SCharles Manning /* Let's create it (if it does not exist) assuming it is a file so that
4131753ac610SCharles Manning * it can do shrinking etc.
41320e8cc8bdSWilliam Juul * We put it in unlinked dir to be cleaned up after the scanning
41330e8cc8bdSWilliam Juul */
41340e8cc8bdSWilliam Juul obj =
4135753ac610SCharles Manning yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
4136753ac610SCharles Manning if (!obj)
4137753ac610SCharles Manning return;
4138753ac610SCharles Manning obj->is_shadowed = 1;
4139753ac610SCharles Manning yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
4140753ac610SCharles Manning obj->variant.file_variant.shrink_size = 0;
4141753ac610SCharles Manning obj->valid = 1; /* So that we don't read any other info. */
41420e8cc8bdSWilliam Juul }
41430e8cc8bdSWilliam Juul
yaffs_link_fixup(struct yaffs_dev * dev,struct list_head * hard_list)4144753ac610SCharles Manning void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
41450e8cc8bdSWilliam Juul {
4146753ac610SCharles Manning struct list_head *lh;
4147753ac610SCharles Manning struct list_head *save;
4148753ac610SCharles Manning struct yaffs_obj *hl;
4149753ac610SCharles Manning struct yaffs_obj *in;
41500e8cc8bdSWilliam Juul
4151753ac610SCharles Manning list_for_each_safe(lh, save, hard_list) {
4152753ac610SCharles Manning hl = list_entry(lh, struct yaffs_obj, hard_links);
4153753ac610SCharles Manning in = yaffs_find_by_number(dev,
4154753ac610SCharles Manning hl->variant.hardlink_variant.equiv_id);
41550e8cc8bdSWilliam Juul
41560e8cc8bdSWilliam Juul if (in) {
41570e8cc8bdSWilliam Juul /* Add the hardlink pointers */
4158753ac610SCharles Manning hl->variant.hardlink_variant.equiv_obj = in;
4159753ac610SCharles Manning list_add(&hl->hard_links, &in->hard_links);
41600e8cc8bdSWilliam Juul } else {
41610e8cc8bdSWilliam Juul /* Todo Need to report/handle this better.
41620e8cc8bdSWilliam Juul * Got a problem... hardlink to a non-existant object
41630e8cc8bdSWilliam Juul */
4164753ac610SCharles Manning hl->variant.hardlink_variant.equiv_obj = NULL;
4165753ac610SCharles Manning INIT_LIST_HEAD(&hl->hard_links);
4166753ac610SCharles Manning }
4167753ac610SCharles Manning }
41680e8cc8bdSWilliam Juul }
41690e8cc8bdSWilliam Juul
yaffs_strip_deleted_objs(struct yaffs_dev * dev)4170753ac610SCharles Manning static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
41710e8cc8bdSWilliam Juul {
4172753ac610SCharles Manning /*
4173753ac610SCharles Manning * Sort out state of unlinked and deleted objects after scanning.
41740e8cc8bdSWilliam Juul */
41750e8cc8bdSWilliam Juul struct list_head *i;
41760e8cc8bdSWilliam Juul struct list_head *n;
4177753ac610SCharles Manning struct yaffs_obj *l;
41780e8cc8bdSWilliam Juul
4179753ac610SCharles Manning if (dev->read_only)
41800e8cc8bdSWilliam Juul return;
41810e8cc8bdSWilliam Juul
41820e8cc8bdSWilliam Juul /* Soft delete all the unlinked files */
41830e8cc8bdSWilliam Juul list_for_each_safe(i, n,
4184753ac610SCharles Manning &dev->unlinked_dir->variant.dir_variant.children) {
4185753ac610SCharles Manning l = list_entry(i, struct yaffs_obj, siblings);
4186753ac610SCharles Manning yaffs_del_obj(l);
4187753ac610SCharles Manning }
4188753ac610SCharles Manning
4189753ac610SCharles Manning list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
4190753ac610SCharles Manning l = list_entry(i, struct yaffs_obj, siblings);
4191753ac610SCharles Manning yaffs_del_obj(l);
41920e8cc8bdSWilliam Juul }
41930e8cc8bdSWilliam Juul }
41940e8cc8bdSWilliam Juul
4195753ac610SCharles Manning /*
4196753ac610SCharles Manning * This code iterates through all the objects making sure that they are rooted.
4197753ac610SCharles Manning * Any unrooted objects are re-rooted in lost+found.
4198753ac610SCharles Manning * An object needs to be in one of:
4199753ac610SCharles Manning * - Directly under deleted, unlinked
4200753ac610SCharles Manning * - Directly or indirectly under root.
4201753ac610SCharles Manning *
4202753ac610SCharles Manning * Note:
4203753ac610SCharles Manning * This code assumes that we don't ever change the current relationships
4204753ac610SCharles Manning * between directories:
4205753ac610SCharles Manning * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
4206753ac610SCharles Manning * lost-n-found->parent == root_dir
4207753ac610SCharles Manning *
4208753ac610SCharles Manning * This fixes the problem where directories might have inadvertently been
4209753ac610SCharles Manning * deleted leaving the object "hanging" without being rooted in the
4210753ac610SCharles Manning * directory tree.
4211753ac610SCharles Manning */
42120e8cc8bdSWilliam Juul
yaffs_has_null_parent(struct yaffs_dev * dev,struct yaffs_obj * obj)4213753ac610SCharles Manning static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
42140e8cc8bdSWilliam Juul {
4215753ac610SCharles Manning return (obj == dev->del_dir ||
4216753ac610SCharles Manning obj == dev->unlinked_dir || obj == dev->root_dir);
42170e8cc8bdSWilliam Juul }
42180e8cc8bdSWilliam Juul
yaffs_fix_hanging_objs(struct yaffs_dev * dev)4219753ac610SCharles Manning static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
42200e8cc8bdSWilliam Juul {
4221753ac610SCharles Manning struct yaffs_obj *obj;
4222753ac610SCharles Manning struct yaffs_obj *parent;
4223753ac610SCharles Manning int i;
4224753ac610SCharles Manning struct list_head *lh;
4225753ac610SCharles Manning struct list_head *n;
4226753ac610SCharles Manning int depth_limit;
4227753ac610SCharles Manning int hanging;
42280e8cc8bdSWilliam Juul
4229753ac610SCharles Manning if (dev->read_only)
4230753ac610SCharles Manning return;
4231753ac610SCharles Manning
4232753ac610SCharles Manning /* Iterate through the objects in each hash entry,
4233753ac610SCharles Manning * looking at each object.
4234753ac610SCharles Manning * Make sure it is rooted.
4235753ac610SCharles Manning */
4236753ac610SCharles Manning
4237753ac610SCharles Manning for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
4238753ac610SCharles Manning list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
4239753ac610SCharles Manning obj = list_entry(lh, struct yaffs_obj, hash_link);
4240753ac610SCharles Manning parent = obj->parent;
4241753ac610SCharles Manning
4242753ac610SCharles Manning if (yaffs_has_null_parent(dev, obj)) {
4243753ac610SCharles Manning /* These directories are not hanging */
4244753ac610SCharles Manning hanging = 0;
4245753ac610SCharles Manning } else if (!parent ||
4246753ac610SCharles Manning parent->variant_type !=
4247753ac610SCharles Manning YAFFS_OBJECT_TYPE_DIRECTORY) {
4248753ac610SCharles Manning hanging = 1;
4249753ac610SCharles Manning } else if (yaffs_has_null_parent(dev, parent)) {
4250753ac610SCharles Manning hanging = 0;
4251753ac610SCharles Manning } else {
4252753ac610SCharles Manning /*
4253753ac610SCharles Manning * Need to follow the parent chain to
4254753ac610SCharles Manning * see if it is hanging.
4255753ac610SCharles Manning */
4256753ac610SCharles Manning hanging = 0;
4257753ac610SCharles Manning depth_limit = 100;
4258753ac610SCharles Manning
4259753ac610SCharles Manning while (parent != dev->root_dir &&
4260753ac610SCharles Manning parent->parent &&
4261753ac610SCharles Manning parent->parent->variant_type ==
4262753ac610SCharles Manning YAFFS_OBJECT_TYPE_DIRECTORY &&
4263753ac610SCharles Manning depth_limit > 0) {
4264753ac610SCharles Manning parent = parent->parent;
4265753ac610SCharles Manning depth_limit--;
42660e8cc8bdSWilliam Juul }
4267753ac610SCharles Manning if (parent != dev->root_dir)
4268753ac610SCharles Manning hanging = 1;
42690e8cc8bdSWilliam Juul }
4270753ac610SCharles Manning if (hanging) {
4271753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_SCAN,
4272753ac610SCharles Manning "Hanging object %d moved to lost and found",
4273753ac610SCharles Manning obj->obj_id);
4274753ac610SCharles Manning yaffs_add_obj_to_dir(dev->lost_n_found, obj);
42750e8cc8bdSWilliam Juul }
4276753ac610SCharles Manning }
42770e8cc8bdSWilliam Juul }
42780e8cc8bdSWilliam Juul }
42790e8cc8bdSWilliam Juul
4280753ac610SCharles Manning /*
4281753ac610SCharles Manning * Delete directory contents for cleaning up lost and found.
4282753ac610SCharles Manning */
yaffs_del_dir_contents(struct yaffs_obj * dir)4283753ac610SCharles Manning static void yaffs_del_dir_contents(struct yaffs_obj *dir)
4284753ac610SCharles Manning {
4285753ac610SCharles Manning struct yaffs_obj *obj;
4286753ac610SCharles Manning struct list_head *lh;
4287753ac610SCharles Manning struct list_head *n;
4288753ac610SCharles Manning
4289753ac610SCharles Manning if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
4290753ac610SCharles Manning BUG();
4291753ac610SCharles Manning
4292753ac610SCharles Manning list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
4293753ac610SCharles Manning obj = list_entry(lh, struct yaffs_obj, siblings);
4294753ac610SCharles Manning if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
4295753ac610SCharles Manning yaffs_del_dir_contents(obj);
4296753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_SCAN,
4297753ac610SCharles Manning "Deleting lost_found object %d",
4298753ac610SCharles Manning obj->obj_id);
4299753ac610SCharles Manning yaffs_unlink_obj(obj);
4300753ac610SCharles Manning }
4301753ac610SCharles Manning }
4302753ac610SCharles Manning
yaffs_empty_l_n_f(struct yaffs_dev * dev)4303753ac610SCharles Manning static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
4304753ac610SCharles Manning {
4305753ac610SCharles Manning yaffs_del_dir_contents(dev->lost_n_found);
4306753ac610SCharles Manning }
4307753ac610SCharles Manning
4308753ac610SCharles Manning
yaffs_find_by_name(struct yaffs_obj * directory,const YCHAR * name)4309753ac610SCharles Manning struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
43100e8cc8bdSWilliam Juul const YCHAR *name)
43110e8cc8bdSWilliam Juul {
43120e8cc8bdSWilliam Juul int sum;
43130e8cc8bdSWilliam Juul struct list_head *i;
43140e8cc8bdSWilliam Juul YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
4315753ac610SCharles Manning struct yaffs_obj *l;
43160e8cc8bdSWilliam Juul
4317753ac610SCharles Manning if (!name)
43180e8cc8bdSWilliam Juul return NULL;
43190e8cc8bdSWilliam Juul
43200e8cc8bdSWilliam Juul if (!directory) {
4321753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
4322753ac610SCharles Manning "tragedy: yaffs_find_by_name: null pointer directory"
4323753ac610SCharles Manning );
4324753ac610SCharles Manning BUG();
43250e8cc8bdSWilliam Juul return NULL;
43260e8cc8bdSWilliam Juul }
4327753ac610SCharles Manning if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4328753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
4329753ac610SCharles Manning "tragedy: yaffs_find_by_name: non-directory"
4330753ac610SCharles Manning );
4331753ac610SCharles Manning BUG();
43320e8cc8bdSWilliam Juul }
43330e8cc8bdSWilliam Juul
4334753ac610SCharles Manning sum = yaffs_calc_name_sum(name);
43350e8cc8bdSWilliam Juul
4336753ac610SCharles Manning list_for_each(i, &directory->variant.dir_variant.children) {
4337753ac610SCharles Manning l = list_entry(i, struct yaffs_obj, siblings);
43380e8cc8bdSWilliam Juul
4339753ac610SCharles Manning if (l->parent != directory)
4340753ac610SCharles Manning BUG();
4341753ac610SCharles Manning
4342753ac610SCharles Manning yaffs_check_obj_details_loaded(l);
4343753ac610SCharles Manning
4344753ac610SCharles Manning /* Special case for lost-n-found */
4345753ac610SCharles Manning if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4346753ac610SCharles Manning if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME))
4347753ac610SCharles Manning return l;
4348753ac610SCharles Manning } else if (l->sum == sum || l->hdr_chunk <= 0) {
4349753ac610SCharles Manning /* LostnFound chunk called Objxxx
4350753ac610SCharles Manning * Do a real check
4351753ac610SCharles Manning */
4352753ac610SCharles Manning yaffs_get_obj_name(l, buffer,
4353753ac610SCharles Manning YAFFS_MAX_NAME_LENGTH + 1);
4354753ac610SCharles Manning if (!yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
4355753ac610SCharles Manning return l;
43560e8cc8bdSWilliam Juul }
4357753ac610SCharles Manning }
4358753ac610SCharles Manning return NULL;
4359753ac610SCharles Manning }
43600e8cc8bdSWilliam Juul
43610e8cc8bdSWilliam Juul /* GetEquivalentObject dereferences any hard links to get to the
43620e8cc8bdSWilliam Juul * actual object.
43630e8cc8bdSWilliam Juul */
43640e8cc8bdSWilliam Juul
yaffs_get_equivalent_obj(struct yaffs_obj * obj)4365753ac610SCharles Manning struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
43660e8cc8bdSWilliam Juul {
4367753ac610SCharles Manning if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
4368753ac610SCharles Manning obj = obj->variant.hardlink_variant.equiv_obj;
4369753ac610SCharles Manning yaffs_check_obj_details_loaded(obj);
43700e8cc8bdSWilliam Juul }
43710e8cc8bdSWilliam Juul return obj;
43720e8cc8bdSWilliam Juul }
43730e8cc8bdSWilliam Juul
4374753ac610SCharles Manning /*
4375753ac610SCharles Manning * A note or two on object names.
4376753ac610SCharles Manning * * If the object name is missing, we then make one up in the form objnnn
4377753ac610SCharles Manning *
4378753ac610SCharles Manning * * ASCII names are stored in the object header's name field from byte zero
4379753ac610SCharles Manning * * Unicode names are historically stored starting from byte zero.
4380753ac610SCharles Manning *
4381753ac610SCharles Manning * Then there are automatic Unicode names...
4382753ac610SCharles Manning * The purpose of these is to save names in a way that can be read as
4383753ac610SCharles Manning * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4384753ac610SCharles Manning * system to share files.
4385753ac610SCharles Manning *
4386753ac610SCharles Manning * These automatic unicode are stored slightly differently...
4387753ac610SCharles Manning * - If the name can fit in the ASCII character space then they are saved as
4388753ac610SCharles Manning * ascii names as per above.
4389753ac610SCharles Manning * - If the name needs Unicode then the name is saved in Unicode
4390753ac610SCharles Manning * starting at oh->name[1].
4391753ac610SCharles Manning
4392753ac610SCharles Manning */
yaffs_fix_null_name(struct yaffs_obj * obj,YCHAR * name,int buffer_size)4393753ac610SCharles Manning static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
4394753ac610SCharles Manning int buffer_size)
43950e8cc8bdSWilliam Juul {
4396753ac610SCharles Manning /* Create an object name if we could not find one. */
4397753ac610SCharles Manning if (yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
4398753ac610SCharles Manning YCHAR local_name[20];
4399753ac610SCharles Manning YCHAR num_string[20];
4400753ac610SCharles Manning YCHAR *x = &num_string[19];
4401753ac610SCharles Manning unsigned v = obj->obj_id;
4402753ac610SCharles Manning num_string[19] = 0;
4403753ac610SCharles Manning while (v > 0) {
4404753ac610SCharles Manning x--;
4405753ac610SCharles Manning *x = '0' + (v % 10);
4406753ac610SCharles Manning v /= 10;
4407753ac610SCharles Manning }
44080e8cc8bdSWilliam Juul /* make up a name */
4409753ac610SCharles Manning yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
4410753ac610SCharles Manning yaffs_strcat(local_name, x);
4411753ac610SCharles Manning yaffs_strncpy(name, local_name, buffer_size - 1);
44120e8cc8bdSWilliam Juul }
44130e8cc8bdSWilliam Juul }
44140e8cc8bdSWilliam Juul
yaffs_get_obj_name(struct yaffs_obj * obj,YCHAR * name,int buffer_size)4415753ac610SCharles Manning int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size)
44160e8cc8bdSWilliam Juul {
4417753ac610SCharles Manning memset(name, 0, buffer_size * sizeof(YCHAR));
4418753ac610SCharles Manning yaffs_check_obj_details_loaded(obj);
4419753ac610SCharles Manning if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4420753ac610SCharles Manning yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
4421753ac610SCharles Manning } else if (obj->short_name[0]) {
4422753ac610SCharles Manning yaffs_strcpy(name, obj->short_name);
4423753ac610SCharles Manning } else if (obj->hdr_chunk > 0) {
4424753ac610SCharles Manning u8 *buffer = yaffs_get_temp_buffer(obj->my_dev);
44250e8cc8bdSWilliam Juul
4426753ac610SCharles Manning struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
44270e8cc8bdSWilliam Juul
4428753ac610SCharles Manning memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
4429753ac610SCharles Manning
4430753ac610SCharles Manning if (obj->hdr_chunk > 0) {
44318cc64bafSAnatolij Gustschin yaffs_rd_chunk_tags_nand(obj->my_dev,
4432753ac610SCharles Manning obj->hdr_chunk,
4433753ac610SCharles Manning buffer, NULL);
44340e8cc8bdSWilliam Juul }
4435753ac610SCharles Manning yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
4436753ac610SCharles Manning buffer_size);
4437753ac610SCharles Manning
4438753ac610SCharles Manning yaffs_release_temp_buffer(obj->my_dev, buffer);
4439753ac610SCharles Manning }
4440753ac610SCharles Manning
4441753ac610SCharles Manning yaffs_fix_null_name(obj, name, buffer_size);
4442753ac610SCharles Manning
4443753ac610SCharles Manning return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH);
4444753ac610SCharles Manning }
4445753ac610SCharles Manning
yaffs_get_obj_length(struct yaffs_obj * obj)4446753ac610SCharles Manning loff_t yaffs_get_obj_length(struct yaffs_obj *obj)
4447753ac610SCharles Manning {
4448753ac610SCharles Manning /* Dereference any hard linking */
4449753ac610SCharles Manning obj = yaffs_get_equivalent_obj(obj);
4450753ac610SCharles Manning
4451753ac610SCharles Manning if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
4452753ac610SCharles Manning return obj->variant.file_variant.file_size;
4453753ac610SCharles Manning if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
4454753ac610SCharles Manning if (!obj->variant.symlink_variant.alias)
4455753ac610SCharles Manning return 0;
4456753ac610SCharles Manning return yaffs_strnlen(obj->variant.symlink_variant.alias,
4457753ac610SCharles Manning YAFFS_MAX_ALIAS_LENGTH);
44580e8cc8bdSWilliam Juul } else {
44590e8cc8bdSWilliam Juul /* Only a directory should drop through to here */
4460753ac610SCharles Manning return obj->my_dev->data_bytes_per_chunk;
44610e8cc8bdSWilliam Juul }
44620e8cc8bdSWilliam Juul }
44630e8cc8bdSWilliam Juul
yaffs_get_obj_link_count(struct yaffs_obj * obj)4464753ac610SCharles Manning int yaffs_get_obj_link_count(struct yaffs_obj *obj)
44650e8cc8bdSWilliam Juul {
44660e8cc8bdSWilliam Juul int count = 0;
44670e8cc8bdSWilliam Juul struct list_head *i;
44680e8cc8bdSWilliam Juul
4469753ac610SCharles Manning if (!obj->unlinked)
44700e8cc8bdSWilliam Juul count++; /* the object itself */
4471753ac610SCharles Manning
4472753ac610SCharles Manning list_for_each(i, &obj->hard_links)
44730e8cc8bdSWilliam Juul count++; /* add the hard links; */
4474753ac610SCharles Manning
44750e8cc8bdSWilliam Juul return count;
44760e8cc8bdSWilliam Juul }
44770e8cc8bdSWilliam Juul
yaffs_get_obj_inode(struct yaffs_obj * obj)4478753ac610SCharles Manning int yaffs_get_obj_inode(struct yaffs_obj *obj)
44790e8cc8bdSWilliam Juul {
4480753ac610SCharles Manning obj = yaffs_get_equivalent_obj(obj);
44810e8cc8bdSWilliam Juul
4482753ac610SCharles Manning return obj->obj_id;
44830e8cc8bdSWilliam Juul }
44840e8cc8bdSWilliam Juul
yaffs_get_obj_type(struct yaffs_obj * obj)4485753ac610SCharles Manning unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
44860e8cc8bdSWilliam Juul {
4487753ac610SCharles Manning obj = yaffs_get_equivalent_obj(obj);
44880e8cc8bdSWilliam Juul
4489753ac610SCharles Manning switch (obj->variant_type) {
44900e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_FILE:
44910e8cc8bdSWilliam Juul return DT_REG;
44920e8cc8bdSWilliam Juul break;
44930e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_DIRECTORY:
44940e8cc8bdSWilliam Juul return DT_DIR;
44950e8cc8bdSWilliam Juul break;
44960e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SYMLINK:
44970e8cc8bdSWilliam Juul return DT_LNK;
44980e8cc8bdSWilliam Juul break;
44990e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_HARDLINK:
45000e8cc8bdSWilliam Juul return DT_REG;
45010e8cc8bdSWilliam Juul break;
45020e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SPECIAL:
45030e8cc8bdSWilliam Juul if (S_ISFIFO(obj->yst_mode))
45040e8cc8bdSWilliam Juul return DT_FIFO;
45050e8cc8bdSWilliam Juul if (S_ISCHR(obj->yst_mode))
45060e8cc8bdSWilliam Juul return DT_CHR;
45070e8cc8bdSWilliam Juul if (S_ISBLK(obj->yst_mode))
45080e8cc8bdSWilliam Juul return DT_BLK;
45090e8cc8bdSWilliam Juul if (S_ISSOCK(obj->yst_mode))
45100e8cc8bdSWilliam Juul return DT_SOCK;
4511753ac610SCharles Manning return DT_REG;
4512753ac610SCharles Manning break;
45130e8cc8bdSWilliam Juul default:
45140e8cc8bdSWilliam Juul return DT_REG;
45150e8cc8bdSWilliam Juul break;
45160e8cc8bdSWilliam Juul }
45170e8cc8bdSWilliam Juul }
45180e8cc8bdSWilliam Juul
yaffs_get_symlink_alias(struct yaffs_obj * obj)4519753ac610SCharles Manning YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
45200e8cc8bdSWilliam Juul {
4521753ac610SCharles Manning obj = yaffs_get_equivalent_obj(obj);
4522753ac610SCharles Manning if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
4523753ac610SCharles Manning return yaffs_clone_str(obj->variant.symlink_variant.alias);
4524753ac610SCharles Manning else
4525753ac610SCharles Manning return yaffs_clone_str(_Y(""));
45260e8cc8bdSWilliam Juul }
45270e8cc8bdSWilliam Juul
4528753ac610SCharles Manning /*--------------------------- Initialisation code -------------------------- */
45290e8cc8bdSWilliam Juul
yaffs_check_dev_fns(const struct yaffs_dev * dev)4530753ac610SCharles Manning static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
45310e8cc8bdSWilliam Juul {
45320e8cc8bdSWilliam Juul /* Common functions, gotta have */
4533753ac610SCharles Manning if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
45340e8cc8bdSWilliam Juul return 0;
45350e8cc8bdSWilliam Juul
45360e8cc8bdSWilliam Juul /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
4537753ac610SCharles Manning if (dev->param.write_chunk_tags_fn &&
4538753ac610SCharles Manning dev->param.read_chunk_tags_fn &&
4539753ac610SCharles Manning !dev->param.write_chunk_fn &&
4540753ac610SCharles Manning !dev->param.read_chunk_fn &&
4541753ac610SCharles Manning dev->param.bad_block_fn && dev->param.query_block_fn)
45420e8cc8bdSWilliam Juul return 1;
45430e8cc8bdSWilliam Juul
45440e8cc8bdSWilliam Juul /* Can use the "spare" style interface for yaffs1 */
4545753ac610SCharles Manning if (!dev->param.is_yaffs2 &&
4546753ac610SCharles Manning !dev->param.write_chunk_tags_fn &&
4547753ac610SCharles Manning !dev->param.read_chunk_tags_fn &&
4548753ac610SCharles Manning dev->param.write_chunk_fn &&
4549753ac610SCharles Manning dev->param.read_chunk_fn &&
4550753ac610SCharles Manning !dev->param.bad_block_fn && !dev->param.query_block_fn)
45510e8cc8bdSWilliam Juul return 1;
45520e8cc8bdSWilliam Juul
45530e8cc8bdSWilliam Juul return 0; /* bad */
45540e8cc8bdSWilliam Juul }
45550e8cc8bdSWilliam Juul
yaffs_create_initial_dir(struct yaffs_dev * dev)4556753ac610SCharles Manning static int yaffs_create_initial_dir(struct yaffs_dev *dev)
45570e8cc8bdSWilliam Juul {
4558753ac610SCharles Manning /* Initialise the unlinked, deleted, root and lost+found directories */
4559753ac610SCharles Manning dev->lost_n_found = dev->root_dir = NULL;
4560753ac610SCharles Manning dev->unlinked_dir = dev->del_dir = NULL;
4561753ac610SCharles Manning dev->unlinked_dir =
4562753ac610SCharles Manning yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
4563753ac610SCharles Manning dev->del_dir =
4564753ac610SCharles Manning yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
4565753ac610SCharles Manning dev->root_dir =
4566753ac610SCharles Manning yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
45670e8cc8bdSWilliam Juul YAFFS_ROOT_MODE | S_IFDIR);
4568753ac610SCharles Manning dev->lost_n_found =
4569753ac610SCharles Manning yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
45700e8cc8bdSWilliam Juul YAFFS_LOSTNFOUND_MODE | S_IFDIR);
45710e8cc8bdSWilliam Juul
4572753ac610SCharles Manning if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
4573753ac610SCharles Manning && dev->del_dir) {
4574753ac610SCharles Manning yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
45750e8cc8bdSWilliam Juul return YAFFS_OK;
45760e8cc8bdSWilliam Juul }
45770e8cc8bdSWilliam Juul return YAFFS_FAIL;
45780e8cc8bdSWilliam Juul }
45790e8cc8bdSWilliam Juul
yaffs_guts_initialise(struct yaffs_dev * dev)4580753ac610SCharles Manning int yaffs_guts_initialise(struct yaffs_dev *dev)
45810e8cc8bdSWilliam Juul {
45820e8cc8bdSWilliam Juul int init_failed = 0;
45830e8cc8bdSWilliam Juul unsigned x;
45840e8cc8bdSWilliam Juul int bits;
45850e8cc8bdSWilliam Juul
4586753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_guts_initialise()");
45870e8cc8bdSWilliam Juul
45880e8cc8bdSWilliam Juul /* Check stuff that must be set */
45890e8cc8bdSWilliam Juul
45900e8cc8bdSWilliam Juul if (!dev) {
4591753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
4592753ac610SCharles Manning "yaffs: Need a device"
4593753ac610SCharles Manning );
45940e8cc8bdSWilliam Juul return YAFFS_FAIL;
45950e8cc8bdSWilliam Juul }
45960e8cc8bdSWilliam Juul
4597753ac610SCharles Manning if (dev->is_mounted) {
4598753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
4599753ac610SCharles Manning return YAFFS_FAIL;
4600753ac610SCharles Manning }
46010e8cc8bdSWilliam Juul
4602753ac610SCharles Manning dev->internal_start_block = dev->param.start_block;
4603753ac610SCharles Manning dev->internal_end_block = dev->param.end_block;
4604753ac610SCharles Manning dev->block_offset = 0;
4605753ac610SCharles Manning dev->chunk_offset = 0;
4606753ac610SCharles Manning dev->n_free_chunks = 0;
4607753ac610SCharles Manning
4608753ac610SCharles Manning dev->gc_block = 0;
4609753ac610SCharles Manning
4610753ac610SCharles Manning if (dev->param.start_block == 0) {
4611753ac610SCharles Manning dev->internal_start_block = dev->param.start_block + 1;
4612753ac610SCharles Manning dev->internal_end_block = dev->param.end_block + 1;
4613753ac610SCharles Manning dev->block_offset = 1;
4614753ac610SCharles Manning dev->chunk_offset = dev->param.chunks_per_block;
46150e8cc8bdSWilliam Juul }
46160e8cc8bdSWilliam Juul
46170e8cc8bdSWilliam Juul /* Check geometry parameters. */
46180e8cc8bdSWilliam Juul
4619753ac610SCharles Manning if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
4620753ac610SCharles Manning dev->param.total_bytes_per_chunk < 1024) ||
4621753ac610SCharles Manning (!dev->param.is_yaffs2 &&
4622753ac610SCharles Manning dev->param.total_bytes_per_chunk < 512) ||
4623753ac610SCharles Manning (dev->param.inband_tags && !dev->param.is_yaffs2) ||
4624753ac610SCharles Manning dev->param.chunks_per_block < 2 ||
4625753ac610SCharles Manning dev->param.n_reserved_blocks < 2 ||
4626753ac610SCharles Manning dev->internal_start_block <= 0 ||
4627753ac610SCharles Manning dev->internal_end_block <= 0 ||
4628753ac610SCharles Manning dev->internal_end_block <=
4629753ac610SCharles Manning (dev->internal_start_block + dev->param.n_reserved_blocks + 2)
46300e8cc8bdSWilliam Juul ) {
4631753ac610SCharles Manning /* otherwise it is too small */
4632753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
4633753ac610SCharles Manning "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
4634753ac610SCharles Manning dev->param.total_bytes_per_chunk,
4635753ac610SCharles Manning dev->param.is_yaffs2 ? "2" : "",
4636753ac610SCharles Manning dev->param.inband_tags);
46370e8cc8bdSWilliam Juul return YAFFS_FAIL;
46380e8cc8bdSWilliam Juul }
46390e8cc8bdSWilliam Juul
4640753ac610SCharles Manning if (yaffs_init_nand(dev) != YAFFS_OK) {
4641753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
46420e8cc8bdSWilliam Juul return YAFFS_FAIL;
46430e8cc8bdSWilliam Juul }
46440e8cc8bdSWilliam Juul
4645753ac610SCharles Manning /* Sort out space for inband tags, if required */
4646753ac610SCharles Manning if (dev->param.inband_tags)
4647753ac610SCharles Manning dev->data_bytes_per_chunk =
4648753ac610SCharles Manning dev->param.total_bytes_per_chunk -
4649753ac610SCharles Manning sizeof(struct yaffs_packed_tags2_tags_only);
4650753ac610SCharles Manning else
4651753ac610SCharles Manning dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
4652753ac610SCharles Manning
46530e8cc8bdSWilliam Juul /* Got the right mix of functions? */
4654753ac610SCharles Manning if (!yaffs_check_dev_fns(dev)) {
46550e8cc8bdSWilliam Juul /* Function missing */
4656753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS,
4657753ac610SCharles Manning "device function(s) missing or wrong");
46580e8cc8bdSWilliam Juul
46590e8cc8bdSWilliam Juul return YAFFS_FAIL;
46600e8cc8bdSWilliam Juul }
46610e8cc8bdSWilliam Juul
4662753ac610SCharles Manning /* Finished with most checks. Further checks happen later on too. */
46630e8cc8bdSWilliam Juul
4664753ac610SCharles Manning dev->is_mounted = 1;
46650e8cc8bdSWilliam Juul
46660e8cc8bdSWilliam Juul /* OK now calculate a few things for the device */
46670e8cc8bdSWilliam Juul
46680e8cc8bdSWilliam Juul /*
46690e8cc8bdSWilliam Juul * Calculate all the chunk size manipulation numbers:
46700e8cc8bdSWilliam Juul */
4671753ac610SCharles Manning x = dev->data_bytes_per_chunk;
4672753ac610SCharles Manning /* We always use dev->chunk_shift and dev->chunk_div */
4673753ac610SCharles Manning dev->chunk_shift = calc_shifts(x);
4674753ac610SCharles Manning x >>= dev->chunk_shift;
4675753ac610SCharles Manning dev->chunk_div = x;
4676753ac610SCharles Manning /* We only use chunk mask if chunk_div is 1 */
4677753ac610SCharles Manning dev->chunk_mask = (1 << dev->chunk_shift) - 1;
46780e8cc8bdSWilliam Juul
46790e8cc8bdSWilliam Juul /*
4680753ac610SCharles Manning * Calculate chunk_grp_bits.
4681753ac610SCharles Manning * We need to find the next power of 2 > than internal_end_block
46820e8cc8bdSWilliam Juul */
46830e8cc8bdSWilliam Juul
4684753ac610SCharles Manning x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
46850e8cc8bdSWilliam Juul
4686753ac610SCharles Manning bits = calc_shifts_ceiling(x);
46870e8cc8bdSWilliam Juul
46880e8cc8bdSWilliam Juul /* Set up tnode width if wide tnodes are enabled. */
4689753ac610SCharles Manning if (!dev->param.wide_tnodes_disabled) {
46900e8cc8bdSWilliam Juul /* bits must be even so that we end up with 32-bit words */
46910e8cc8bdSWilliam Juul if (bits & 1)
46920e8cc8bdSWilliam Juul bits++;
46930e8cc8bdSWilliam Juul if (bits < 16)
4694753ac610SCharles Manning dev->tnode_width = 16;
46950e8cc8bdSWilliam Juul else
4696753ac610SCharles Manning dev->tnode_width = bits;
4697753ac610SCharles Manning } else {
4698753ac610SCharles Manning dev->tnode_width = 16;
46990e8cc8bdSWilliam Juul }
47000e8cc8bdSWilliam Juul
4701753ac610SCharles Manning dev->tnode_mask = (1 << dev->tnode_width) - 1;
47020e8cc8bdSWilliam Juul
47030e8cc8bdSWilliam Juul /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
47040e8cc8bdSWilliam Juul * so if the bitwidth of the
47050e8cc8bdSWilliam Juul * chunk range we're using is greater than 16 we need
4706753ac610SCharles Manning * to figure out chunk shift and chunk_grp_size
47070e8cc8bdSWilliam Juul */
47080e8cc8bdSWilliam Juul
4709753ac610SCharles Manning if (bits <= dev->tnode_width)
4710753ac610SCharles Manning dev->chunk_grp_bits = 0;
47110e8cc8bdSWilliam Juul else
4712753ac610SCharles Manning dev->chunk_grp_bits = bits - dev->tnode_width;
47130e8cc8bdSWilliam Juul
4714753ac610SCharles Manning dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
4715753ac610SCharles Manning if (dev->tnode_size < sizeof(struct yaffs_tnode))
4716753ac610SCharles Manning dev->tnode_size = sizeof(struct yaffs_tnode);
47170e8cc8bdSWilliam Juul
4718753ac610SCharles Manning dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
47190e8cc8bdSWilliam Juul
4720753ac610SCharles Manning if (dev->param.chunks_per_block < dev->chunk_grp_size) {
47210e8cc8bdSWilliam Juul /* We have a problem because the soft delete won't work if
47220e8cc8bdSWilliam Juul * the chunk group size > chunks per block.
47230e8cc8bdSWilliam Juul * This can be remedied by using larger "virtual blocks".
47240e8cc8bdSWilliam Juul */
4725753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
47260e8cc8bdSWilliam Juul
47270e8cc8bdSWilliam Juul return YAFFS_FAIL;
47280e8cc8bdSWilliam Juul }
47290e8cc8bdSWilliam Juul
4730753ac610SCharles Manning /* Finished verifying the device, continue with initialisation */
47310e8cc8bdSWilliam Juul
47320e8cc8bdSWilliam Juul /* More device initialisation */
4733753ac610SCharles Manning dev->all_gcs = 0;
4734753ac610SCharles Manning dev->passive_gc_count = 0;
4735753ac610SCharles Manning dev->oldest_dirty_gc_count = 0;
4736753ac610SCharles Manning dev->bg_gcs = 0;
4737753ac610SCharles Manning dev->gc_block_finder = 0;
4738753ac610SCharles Manning dev->buffered_block = -1;
4739753ac610SCharles Manning dev->doing_buffered_block_rewrite = 0;
4740753ac610SCharles Manning dev->n_deleted_files = 0;
4741753ac610SCharles Manning dev->n_bg_deletions = 0;
4742753ac610SCharles Manning dev->n_unlinked_files = 0;
4743753ac610SCharles Manning dev->n_ecc_fixed = 0;
4744753ac610SCharles Manning dev->n_ecc_unfixed = 0;
4745753ac610SCharles Manning dev->n_tags_ecc_fixed = 0;
4746753ac610SCharles Manning dev->n_tags_ecc_unfixed = 0;
4747753ac610SCharles Manning dev->n_erase_failures = 0;
4748753ac610SCharles Manning dev->n_erased_blocks = 0;
4749753ac610SCharles Manning dev->gc_disable = 0;
4750753ac610SCharles Manning dev->has_pending_prioritised_gc = 1;
4751753ac610SCharles Manning /* Assume the worst for now, will get fixed on first GC */
4752753ac610SCharles Manning INIT_LIST_HEAD(&dev->dirty_dirs);
4753753ac610SCharles Manning dev->oldest_dirty_seq = 0;
4754753ac610SCharles Manning dev->oldest_dirty_block = 0;
47550e8cc8bdSWilliam Juul
47560e8cc8bdSWilliam Juul /* Initialise temporary buffers and caches. */
4757753ac610SCharles Manning if (!yaffs_init_tmp_buffers(dev))
47580e8cc8bdSWilliam Juul init_failed = 1;
47590e8cc8bdSWilliam Juul
4760753ac610SCharles Manning dev->cache = NULL;
4761753ac610SCharles Manning dev->gc_cleanup_list = NULL;
47620e8cc8bdSWilliam Juul
4763753ac610SCharles Manning if (!init_failed && dev->param.n_caches > 0) {
47640e8cc8bdSWilliam Juul int i;
4765753ac610SCharles Manning void *buf;
4766753ac610SCharles Manning int cache_bytes =
4767753ac610SCharles Manning dev->param.n_caches * sizeof(struct yaffs_cache);
47680e8cc8bdSWilliam Juul
4769753ac610SCharles Manning if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
4770753ac610SCharles Manning dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
47710e8cc8bdSWilliam Juul
4772753ac610SCharles Manning dev->cache = kmalloc(cache_bytes, GFP_NOFS);
47730e8cc8bdSWilliam Juul
4774753ac610SCharles Manning buf = (u8 *) dev->cache;
47750e8cc8bdSWilliam Juul
4776753ac610SCharles Manning if (dev->cache)
4777753ac610SCharles Manning memset(dev->cache, 0, cache_bytes);
4778753ac610SCharles Manning
4779753ac610SCharles Manning for (i = 0; i < dev->param.n_caches && buf; i++) {
4780753ac610SCharles Manning dev->cache[i].object = NULL;
4781753ac610SCharles Manning dev->cache[i].last_use = 0;
4782753ac610SCharles Manning dev->cache[i].dirty = 0;
4783753ac610SCharles Manning dev->cache[i].data = buf =
4784753ac610SCharles Manning kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
47850e8cc8bdSWilliam Juul }
47860e8cc8bdSWilliam Juul if (!buf)
47870e8cc8bdSWilliam Juul init_failed = 1;
47880e8cc8bdSWilliam Juul
4789753ac610SCharles Manning dev->cache_last_use = 0;
47900e8cc8bdSWilliam Juul }
47910e8cc8bdSWilliam Juul
4792753ac610SCharles Manning dev->cache_hits = 0;
47930e8cc8bdSWilliam Juul
47940e8cc8bdSWilliam Juul if (!init_failed) {
4795753ac610SCharles Manning dev->gc_cleanup_list =
4796753ac610SCharles Manning kmalloc(dev->param.chunks_per_block * sizeof(u32),
4797753ac610SCharles Manning GFP_NOFS);
4798753ac610SCharles Manning if (!dev->gc_cleanup_list)
47990e8cc8bdSWilliam Juul init_failed = 1;
48000e8cc8bdSWilliam Juul }
48010e8cc8bdSWilliam Juul
4802753ac610SCharles Manning if (dev->param.is_yaffs2)
4803753ac610SCharles Manning dev->param.use_header_file_size = 1;
4804753ac610SCharles Manning
4805753ac610SCharles Manning if (!init_failed && !yaffs_init_blocks(dev))
48060e8cc8bdSWilliam Juul init_failed = 1;
48070e8cc8bdSWilliam Juul
4808753ac610SCharles Manning yaffs_init_tnodes_and_objs(dev);
48090e8cc8bdSWilliam Juul
4810753ac610SCharles Manning if (!init_failed && !yaffs_create_initial_dir(dev))
48110e8cc8bdSWilliam Juul init_failed = 1;
48120e8cc8bdSWilliam Juul
4813753ac610SCharles Manning if (!init_failed && dev->param.is_yaffs2 &&
4814753ac610SCharles Manning !dev->param.disable_summary &&
4815753ac610SCharles Manning !yaffs_summary_init(dev))
4816753ac610SCharles Manning init_failed = 1;
48170e8cc8bdSWilliam Juul
48180e8cc8bdSWilliam Juul if (!init_failed) {
48190e8cc8bdSWilliam Juul /* Now scan the flash. */
4820753ac610SCharles Manning if (dev->param.is_yaffs2) {
4821753ac610SCharles Manning if (yaffs2_checkpt_restore(dev)) {
4822753ac610SCharles Manning yaffs_check_obj_details_loaded(dev->root_dir);
4823753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_CHECKPOINT |
4824753ac610SCharles Manning YAFFS_TRACE_MOUNT,
4825753ac610SCharles Manning "yaffs: restored from checkpoint"
4826753ac610SCharles Manning );
48270e8cc8bdSWilliam Juul } else {
48280e8cc8bdSWilliam Juul
4829753ac610SCharles Manning /* Clean up the mess caused by an aborted
4830753ac610SCharles Manning * checkpoint load then scan backwards.
48310e8cc8bdSWilliam Juul */
4832753ac610SCharles Manning yaffs_deinit_blocks(dev);
48330e8cc8bdSWilliam Juul
4834753ac610SCharles Manning yaffs_deinit_tnodes_and_objs(dev);
48350e8cc8bdSWilliam Juul
4836753ac610SCharles Manning dev->n_erased_blocks = 0;
4837753ac610SCharles Manning dev->n_free_chunks = 0;
4838753ac610SCharles Manning dev->alloc_block = -1;
4839753ac610SCharles Manning dev->alloc_page = -1;
4840753ac610SCharles Manning dev->n_deleted_files = 0;
4841753ac610SCharles Manning dev->n_unlinked_files = 0;
4842753ac610SCharles Manning dev->n_bg_deletions = 0;
48430e8cc8bdSWilliam Juul
4844753ac610SCharles Manning if (!init_failed && !yaffs_init_blocks(dev))
48450e8cc8bdSWilliam Juul init_failed = 1;
48460e8cc8bdSWilliam Juul
4847753ac610SCharles Manning yaffs_init_tnodes_and_objs(dev);
48480e8cc8bdSWilliam Juul
4849753ac610SCharles Manning if (!init_failed
4850753ac610SCharles Manning && !yaffs_create_initial_dir(dev))
48510e8cc8bdSWilliam Juul init_failed = 1;
48520e8cc8bdSWilliam Juul
4853753ac610SCharles Manning if (!init_failed && !yaffs2_scan_backwards(dev))
48540e8cc8bdSWilliam Juul init_failed = 1;
48550e8cc8bdSWilliam Juul }
4856753ac610SCharles Manning } else if (!yaffs1_scan(dev)) {
48570e8cc8bdSWilliam Juul init_failed = 1;
48580e8cc8bdSWilliam Juul }
48590e8cc8bdSWilliam Juul
4860753ac610SCharles Manning yaffs_strip_deleted_objs(dev);
4861753ac610SCharles Manning yaffs_fix_hanging_objs(dev);
4862753ac610SCharles Manning if (dev->param.empty_lost_n_found)
4863753ac610SCharles Manning yaffs_empty_l_n_f(dev);
4864753ac610SCharles Manning }
4865753ac610SCharles Manning
48660e8cc8bdSWilliam Juul if (init_failed) {
48670e8cc8bdSWilliam Juul /* Clean up the mess */
4868753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING,
4869753ac610SCharles Manning "yaffs: yaffs_guts_initialise() aborted.");
48700e8cc8bdSWilliam Juul
4871753ac610SCharles Manning yaffs_deinitialise(dev);
48720e8cc8bdSWilliam Juul return YAFFS_FAIL;
48730e8cc8bdSWilliam Juul }
48740e8cc8bdSWilliam Juul
48750e8cc8bdSWilliam Juul /* Zero out stats */
4876753ac610SCharles Manning dev->n_page_reads = 0;
4877753ac610SCharles Manning dev->n_page_writes = 0;
4878753ac610SCharles Manning dev->n_erasures = 0;
4879753ac610SCharles Manning dev->n_gc_copies = 0;
4880753ac610SCharles Manning dev->n_retried_writes = 0;
48810e8cc8bdSWilliam Juul
4882753ac610SCharles Manning dev->n_retired_blocks = 0;
48830e8cc8bdSWilliam Juul
4884753ac610SCharles Manning yaffs_verify_free_chunks(dev);
4885753ac610SCharles Manning yaffs_verify_blocks(dev);
48860e8cc8bdSWilliam Juul
4887753ac610SCharles Manning /* Clean up any aborted checkpoint data */
4888753ac610SCharles Manning if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
4889753ac610SCharles Manning yaffs2_checkpt_invalidate(dev);
48900e8cc8bdSWilliam Juul
4891753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING,
4892753ac610SCharles Manning "yaffs: yaffs_guts_initialise() done.");
48930e8cc8bdSWilliam Juul return YAFFS_OK;
48940e8cc8bdSWilliam Juul }
48950e8cc8bdSWilliam Juul
yaffs_deinitialise(struct yaffs_dev * dev)4896753ac610SCharles Manning void yaffs_deinitialise(struct yaffs_dev *dev)
48970e8cc8bdSWilliam Juul {
4898753ac610SCharles Manning if (dev->is_mounted) {
48990e8cc8bdSWilliam Juul int i;
49000e8cc8bdSWilliam Juul
4901753ac610SCharles Manning yaffs_deinit_blocks(dev);
4902753ac610SCharles Manning yaffs_deinit_tnodes_and_objs(dev);
4903753ac610SCharles Manning yaffs_summary_deinit(dev);
49040e8cc8bdSWilliam Juul
4905753ac610SCharles Manning if (dev->param.n_caches > 0 && dev->cache) {
4906753ac610SCharles Manning
4907753ac610SCharles Manning for (i = 0; i < dev->param.n_caches; i++) {
4908753ac610SCharles Manning kfree(dev->cache[i].data);
4909753ac610SCharles Manning dev->cache[i].data = NULL;
49100e8cc8bdSWilliam Juul }
49110e8cc8bdSWilliam Juul
4912753ac610SCharles Manning kfree(dev->cache);
4913753ac610SCharles Manning dev->cache = NULL;
49140e8cc8bdSWilliam Juul }
49150e8cc8bdSWilliam Juul
4916753ac610SCharles Manning kfree(dev->gc_cleanup_list);
49170e8cc8bdSWilliam Juul
4918753ac610SCharles Manning for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
4919753ac610SCharles Manning kfree(dev->temp_buffer[i].buffer);
4920753ac610SCharles Manning
4921753ac610SCharles Manning dev->is_mounted = 0;
4922753ac610SCharles Manning
4923753ac610SCharles Manning if (dev->param.deinitialise_flash_fn)
4924753ac610SCharles Manning dev->param.deinitialise_flash_fn(dev);
4925753ac610SCharles Manning }
49260e8cc8bdSWilliam Juul }
49270e8cc8bdSWilliam Juul
yaffs_count_free_chunks(struct yaffs_dev * dev)4928753ac610SCharles Manning int yaffs_count_free_chunks(struct yaffs_dev *dev)
49290e8cc8bdSWilliam Juul {
4930753ac610SCharles Manning int n_free = 0;
49310e8cc8bdSWilliam Juul int b;
4932753ac610SCharles Manning struct yaffs_block_info *blk;
49330e8cc8bdSWilliam Juul
4934753ac610SCharles Manning blk = dev->block_info;
4935753ac610SCharles Manning for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
4936753ac610SCharles Manning switch (blk->block_state) {
49370e8cc8bdSWilliam Juul case YAFFS_BLOCK_STATE_EMPTY:
49380e8cc8bdSWilliam Juul case YAFFS_BLOCK_STATE_ALLOCATING:
49390e8cc8bdSWilliam Juul case YAFFS_BLOCK_STATE_COLLECTING:
49400e8cc8bdSWilliam Juul case YAFFS_BLOCK_STATE_FULL:
4941753ac610SCharles Manning n_free +=
4942753ac610SCharles Manning (dev->param.chunks_per_block - blk->pages_in_use +
4943753ac610SCharles Manning blk->soft_del_pages);
49440e8cc8bdSWilliam Juul break;
49450e8cc8bdSWilliam Juul default:
49460e8cc8bdSWilliam Juul break;
49470e8cc8bdSWilliam Juul }
4948753ac610SCharles Manning blk++;
4949753ac610SCharles Manning }
4950753ac610SCharles Manning return n_free;
49510e8cc8bdSWilliam Juul }
49520e8cc8bdSWilliam Juul
yaffs_get_n_free_chunks(struct yaffs_dev * dev)4953753ac610SCharles Manning int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
49540e8cc8bdSWilliam Juul {
49550e8cc8bdSWilliam Juul /* This is what we report to the outside world */
4956753ac610SCharles Manning int n_free;
4957753ac610SCharles Manning int n_dirty_caches;
4958753ac610SCharles Manning int blocks_for_checkpt;
49590e8cc8bdSWilliam Juul int i;
4960753ac610SCharles Manning
4961753ac610SCharles Manning n_free = dev->n_free_chunks;
4962753ac610SCharles Manning n_free += dev->n_deleted_files;
4963753ac610SCharles Manning
4964753ac610SCharles Manning /* Now count and subtract the number of dirty chunks in the cache. */
4965753ac610SCharles Manning
4966753ac610SCharles Manning for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
4967753ac610SCharles Manning if (dev->cache[i].dirty)
4968753ac610SCharles Manning n_dirty_caches++;
49690e8cc8bdSWilliam Juul }
49700e8cc8bdSWilliam Juul
4971753ac610SCharles Manning n_free -= n_dirty_caches;
49720e8cc8bdSWilliam Juul
4973753ac610SCharles Manning n_free -=
4974753ac610SCharles Manning ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
49750e8cc8bdSWilliam Juul
4976753ac610SCharles Manning /* Now figure checkpoint space and report that... */
4977753ac610SCharles Manning blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
49780e8cc8bdSWilliam Juul
4979753ac610SCharles Manning n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
49800e8cc8bdSWilliam Juul
4981753ac610SCharles Manning if (n_free < 0)
4982753ac610SCharles Manning n_free = 0;
49830e8cc8bdSWilliam Juul
4984753ac610SCharles Manning return n_free;
49850e8cc8bdSWilliam Juul }
49860e8cc8bdSWilliam Juul
4987753ac610SCharles Manning /*\
4988753ac610SCharles Manning * Marshalling functions to get loff_t file sizes into aand out of
4989753ac610SCharles Manning * object headers.
4990753ac610SCharles Manning */
yaffs_oh_size_load(struct yaffs_obj_hdr * oh,loff_t fsize)4991753ac610SCharles Manning void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize)
49920e8cc8bdSWilliam Juul {
4993753ac610SCharles Manning oh->file_size_low = (fsize & 0xFFFFFFFF);
4994753ac610SCharles Manning oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF);
49950e8cc8bdSWilliam Juul }
49960e8cc8bdSWilliam Juul
yaffs_oh_to_size(struct yaffs_obj_hdr * oh)4997753ac610SCharles Manning loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh)
49980e8cc8bdSWilliam Juul {
4999753ac610SCharles Manning loff_t retval;
50000e8cc8bdSWilliam Juul
5001753ac610SCharles Manning if (~(oh->file_size_high))
5002753ac610SCharles Manning retval = (((loff_t) oh->file_size_high) << 32) |
5003753ac610SCharles Manning (((loff_t) oh->file_size_low) & 0xFFFFFFFF);
5004753ac610SCharles Manning else
5005753ac610SCharles Manning retval = (loff_t) oh->file_size_low;
5006753ac610SCharles Manning
5007753ac610SCharles Manning return retval;
50080e8cc8bdSWilliam Juul }
5009