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 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 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 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 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 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 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 */ 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 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 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 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 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 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 287753ac610SCharles Manning struct yaffs_obj *yaffs_root(struct yaffs_dev *dev) 2880e8cc8bdSWilliam Juul { 289753ac610SCharles Manning return dev->root_dir; 2900e8cc8bdSWilliam Juul } 2910e8cc8bdSWilliam Juul 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 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 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 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 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 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 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 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 */ 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 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 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 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 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 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 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 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 */ 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 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 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 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. */ 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 */ 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 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 */ 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 */ 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 */ 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 */ 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 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 */ 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 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 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 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 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 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.*/ 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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.*/ 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 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 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 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 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 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 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 */ 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 */ 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 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 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 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 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 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 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 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 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 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 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 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 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 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 */ 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 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 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 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 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 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 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 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 */ 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 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 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 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 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 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 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 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 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 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 */ 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 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 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 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 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 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 */ 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 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 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 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 */ 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 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 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 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 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 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 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 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 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 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 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 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 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 */ 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 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