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 { 222753ac610SCharles Manning dev = dev; 223753ac610SCharles Manning nand_chunk = nand_chunk; 224753ac610SCharles Manning data = data; 225753ac610SCharles Manning tags = tags; 2260e8cc8bdSWilliam Juul } 2270e8cc8bdSWilliam Juul 228753ac610SCharles Manning static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk, 229753ac610SCharles Manning const struct yaffs_ext_tags *tags) 2300e8cc8bdSWilliam Juul { 231753ac610SCharles Manning dev = dev; 232753ac610SCharles Manning nand_chunk = nand_chunk; 233753ac610SCharles Manning tags = tags; 2340e8cc8bdSWilliam Juul } 2350e8cc8bdSWilliam Juul 236753ac610SCharles Manning void yaffs_handle_chunk_error(struct yaffs_dev *dev, 237753ac610SCharles Manning struct yaffs_block_info *bi) 2380e8cc8bdSWilliam Juul { 239753ac610SCharles Manning if (!bi->gc_prioritise) { 240753ac610SCharles Manning bi->gc_prioritise = 1; 241753ac610SCharles Manning dev->has_pending_prioritised_gc = 1; 242753ac610SCharles Manning bi->chunk_error_strikes++; 2430e8cc8bdSWilliam Juul 244753ac610SCharles Manning if (bi->chunk_error_strikes > 3) { 245753ac610SCharles Manning bi->needs_retiring = 1; /* Too many stikes, so retire */ 246753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 247753ac610SCharles Manning "yaffs: Block struck out"); 248753ac610SCharles Manning 249753ac610SCharles Manning } 250753ac610SCharles Manning } 2510e8cc8bdSWilliam Juul } 2520e8cc8bdSWilliam Juul 253753ac610SCharles Manning static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk, 254753ac610SCharles Manning int erased_ok) 2550e8cc8bdSWilliam Juul { 256753ac610SCharles Manning int flash_block = nand_chunk / dev->param.chunks_per_block; 257753ac610SCharles Manning struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block); 2580e8cc8bdSWilliam Juul 259753ac610SCharles Manning yaffs_handle_chunk_error(dev, bi); 2600e8cc8bdSWilliam Juul 261753ac610SCharles Manning if (erased_ok) { 262753ac610SCharles Manning /* Was an actual write failure, 263753ac610SCharles Manning * so mark the block for retirement.*/ 264753ac610SCharles Manning bi->needs_retiring = 1; 265753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, 266753ac610SCharles Manning "**>> Block %d needs retiring", flash_block); 2670e8cc8bdSWilliam Juul } 2680e8cc8bdSWilliam Juul 269753ac610SCharles Manning /* Delete the chunk */ 270753ac610SCharles Manning yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); 271753ac610SCharles Manning yaffs_skip_rest_of_block(dev); 2720e8cc8bdSWilliam Juul } 2730e8cc8bdSWilliam Juul 2740e8cc8bdSWilliam Juul /* 2750e8cc8bdSWilliam Juul * Verification code 2760e8cc8bdSWilliam Juul */ 2770e8cc8bdSWilliam Juul 2780e8cc8bdSWilliam Juul /* 2790e8cc8bdSWilliam Juul * Simple hash function. Needs to have a reasonable spread 2800e8cc8bdSWilliam Juul */ 2810e8cc8bdSWilliam Juul 282753ac610SCharles Manning static inline int yaffs_hash_fn(int n) 2830e8cc8bdSWilliam Juul { 28490ef117bSWilliam Juul if (n < 0) 28590ef117bSWilliam Juul n = -n; 286753ac610SCharles Manning return n % YAFFS_NOBJECT_BUCKETS; 2870e8cc8bdSWilliam Juul } 2880e8cc8bdSWilliam Juul 2890e8cc8bdSWilliam Juul /* 290753ac610SCharles Manning * Access functions to useful fake objects. 291753ac610SCharles Manning * Note that root might have a presence in NAND if permissions are set. 2920e8cc8bdSWilliam Juul */ 2930e8cc8bdSWilliam Juul 294753ac610SCharles Manning struct yaffs_obj *yaffs_root(struct yaffs_dev *dev) 2950e8cc8bdSWilliam Juul { 296753ac610SCharles Manning return dev->root_dir; 2970e8cc8bdSWilliam Juul } 2980e8cc8bdSWilliam Juul 299753ac610SCharles Manning struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev) 3000e8cc8bdSWilliam Juul { 301753ac610SCharles Manning return dev->lost_n_found; 3020e8cc8bdSWilliam Juul } 3030e8cc8bdSWilliam Juul 3040e8cc8bdSWilliam Juul /* 3050e8cc8bdSWilliam Juul * Erased NAND checking functions 3060e8cc8bdSWilliam Juul */ 3070e8cc8bdSWilliam Juul 308753ac610SCharles Manning int yaffs_check_ff(u8 *buffer, int n_bytes) 3090e8cc8bdSWilliam Juul { 3100e8cc8bdSWilliam Juul /* Horrible, slow implementation */ 311753ac610SCharles Manning while (n_bytes--) { 312753ac610SCharles Manning if (*buffer != 0xff) 3130e8cc8bdSWilliam Juul return 0; 3140e8cc8bdSWilliam Juul buffer++; 3150e8cc8bdSWilliam Juul } 3160e8cc8bdSWilliam Juul return 1; 3170e8cc8bdSWilliam Juul } 3180e8cc8bdSWilliam Juul 319753ac610SCharles Manning static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk) 3200e8cc8bdSWilliam Juul { 3210e8cc8bdSWilliam Juul int retval = YAFFS_OK; 322753ac610SCharles Manning u8 *data = yaffs_get_temp_buffer(dev); 323753ac610SCharles Manning struct yaffs_ext_tags tags; 3240e8cc8bdSWilliam Juul 325*8cc64bafSAnatolij Gustschin yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags); 3260e8cc8bdSWilliam Juul 327753ac610SCharles Manning if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR) 3280e8cc8bdSWilliam Juul retval = YAFFS_FAIL; 3290e8cc8bdSWilliam Juul 330753ac610SCharles Manning if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) || 331753ac610SCharles Manning tags.chunk_used) { 332753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_NANDACCESS, 333753ac610SCharles Manning "Chunk %d not erased", nand_chunk); 3340e8cc8bdSWilliam Juul retval = YAFFS_FAIL; 3350e8cc8bdSWilliam Juul } 3360e8cc8bdSWilliam Juul 337753ac610SCharles Manning yaffs_release_temp_buffer(dev, data); 3380e8cc8bdSWilliam Juul 3390e8cc8bdSWilliam Juul return retval; 3400e8cc8bdSWilliam Juul 3410e8cc8bdSWilliam Juul } 3420e8cc8bdSWilliam Juul 343753ac610SCharles Manning static int yaffs_verify_chunk_written(struct yaffs_dev *dev, 344753ac610SCharles Manning int nand_chunk, 345753ac610SCharles Manning const u8 *data, 346753ac610SCharles Manning struct yaffs_ext_tags *tags) 347753ac610SCharles Manning { 348753ac610SCharles Manning int retval = YAFFS_OK; 349753ac610SCharles Manning struct yaffs_ext_tags temp_tags; 350753ac610SCharles Manning u8 *buffer = yaffs_get_temp_buffer(dev); 351753ac610SCharles Manning 352*8cc64bafSAnatolij Gustschin yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags); 353753ac610SCharles Manning if (memcmp(buffer, data, dev->data_bytes_per_chunk) || 354753ac610SCharles Manning temp_tags.obj_id != tags->obj_id || 355753ac610SCharles Manning temp_tags.chunk_id != tags->chunk_id || 356753ac610SCharles Manning temp_tags.n_bytes != tags->n_bytes) 357753ac610SCharles Manning retval = YAFFS_FAIL; 358753ac610SCharles Manning 359753ac610SCharles Manning yaffs_release_temp_buffer(dev, buffer); 360753ac610SCharles Manning 361753ac610SCharles Manning return retval; 362753ac610SCharles Manning } 363753ac610SCharles Manning 364753ac610SCharles Manning 365753ac610SCharles Manning int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks) 366753ac610SCharles Manning { 367753ac610SCharles Manning int reserved_chunks; 368753ac610SCharles Manning int reserved_blocks = dev->param.n_reserved_blocks; 369753ac610SCharles Manning int checkpt_blocks; 370753ac610SCharles Manning 371753ac610SCharles Manning checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev); 372753ac610SCharles Manning 373753ac610SCharles Manning reserved_chunks = 374753ac610SCharles Manning (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block; 375753ac610SCharles Manning 376753ac610SCharles Manning return (dev->n_free_chunks > (reserved_chunks + n_chunks)); 377753ac610SCharles Manning } 378753ac610SCharles Manning 379753ac610SCharles Manning static int yaffs_find_alloc_block(struct yaffs_dev *dev) 380753ac610SCharles Manning { 381753ac610SCharles Manning int i; 382753ac610SCharles Manning struct yaffs_block_info *bi; 383753ac610SCharles Manning 384753ac610SCharles Manning if (dev->n_erased_blocks < 1) { 385753ac610SCharles Manning /* Hoosterman we've got a problem. 386753ac610SCharles Manning * Can't get space to gc 387753ac610SCharles Manning */ 388753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 389753ac610SCharles Manning "yaffs tragedy: no more erased blocks"); 390753ac610SCharles Manning 391753ac610SCharles Manning return -1; 392753ac610SCharles Manning } 393753ac610SCharles Manning 394753ac610SCharles Manning /* Find an empty block. */ 395753ac610SCharles Manning 396753ac610SCharles Manning for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { 397753ac610SCharles Manning dev->alloc_block_finder++; 398753ac610SCharles Manning if (dev->alloc_block_finder < dev->internal_start_block 399753ac610SCharles Manning || dev->alloc_block_finder > dev->internal_end_block) { 400753ac610SCharles Manning dev->alloc_block_finder = dev->internal_start_block; 401753ac610SCharles Manning } 402753ac610SCharles Manning 403753ac610SCharles Manning bi = yaffs_get_block_info(dev, dev->alloc_block_finder); 404753ac610SCharles Manning 405753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { 406753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING; 407753ac610SCharles Manning dev->seq_number++; 408753ac610SCharles Manning bi->seq_number = dev->seq_number; 409753ac610SCharles Manning dev->n_erased_blocks--; 410753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALLOCATE, 411753ac610SCharles Manning "Allocated block %d, seq %d, %d left" , 412753ac610SCharles Manning dev->alloc_block_finder, dev->seq_number, 413753ac610SCharles Manning dev->n_erased_blocks); 414753ac610SCharles Manning return dev->alloc_block_finder; 415753ac610SCharles Manning } 416753ac610SCharles Manning } 417753ac610SCharles Manning 418753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 419753ac610SCharles Manning "yaffs tragedy: no more erased blocks, but there should have been %d", 420753ac610SCharles Manning dev->n_erased_blocks); 421753ac610SCharles Manning 422753ac610SCharles Manning return -1; 423753ac610SCharles Manning } 424753ac610SCharles Manning 425753ac610SCharles Manning static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver, 426753ac610SCharles Manning struct yaffs_block_info **block_ptr) 427753ac610SCharles Manning { 428753ac610SCharles Manning int ret_val; 429753ac610SCharles Manning struct yaffs_block_info *bi; 430753ac610SCharles Manning 431753ac610SCharles Manning if (dev->alloc_block < 0) { 432753ac610SCharles Manning /* Get next block to allocate off */ 433753ac610SCharles Manning dev->alloc_block = yaffs_find_alloc_block(dev); 434753ac610SCharles Manning dev->alloc_page = 0; 435753ac610SCharles Manning } 436753ac610SCharles Manning 437753ac610SCharles Manning if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) { 438753ac610SCharles Manning /* No space unless we're allowed to use the reserve. */ 439753ac610SCharles Manning return -1; 440753ac610SCharles Manning } 441753ac610SCharles Manning 442753ac610SCharles Manning if (dev->n_erased_blocks < dev->param.n_reserved_blocks 443753ac610SCharles Manning && dev->alloc_page == 0) 444753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve"); 445753ac610SCharles Manning 446753ac610SCharles Manning /* Next page please.... */ 447753ac610SCharles Manning if (dev->alloc_block >= 0) { 448753ac610SCharles Manning bi = yaffs_get_block_info(dev, dev->alloc_block); 449753ac610SCharles Manning 450753ac610SCharles Manning ret_val = (dev->alloc_block * dev->param.chunks_per_block) + 451753ac610SCharles Manning dev->alloc_page; 452753ac610SCharles Manning bi->pages_in_use++; 453753ac610SCharles Manning yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page); 454753ac610SCharles Manning 455753ac610SCharles Manning dev->alloc_page++; 456753ac610SCharles Manning 457753ac610SCharles Manning dev->n_free_chunks--; 458753ac610SCharles Manning 459753ac610SCharles Manning /* If the block is full set the state to full */ 460753ac610SCharles Manning if (dev->alloc_page >= dev->param.chunks_per_block) { 461753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_FULL; 462753ac610SCharles Manning dev->alloc_block = -1; 463753ac610SCharles Manning } 464753ac610SCharles Manning 465753ac610SCharles Manning if (block_ptr) 466753ac610SCharles Manning *block_ptr = bi; 467753ac610SCharles Manning 468753ac610SCharles Manning return ret_val; 469753ac610SCharles Manning } 470753ac610SCharles Manning 471753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 472753ac610SCharles Manning "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!"); 473753ac610SCharles Manning 474753ac610SCharles Manning return -1; 475753ac610SCharles Manning } 476753ac610SCharles Manning 477753ac610SCharles Manning static int yaffs_get_erased_chunks(struct yaffs_dev *dev) 478753ac610SCharles Manning { 479753ac610SCharles Manning int n; 480753ac610SCharles Manning 481753ac610SCharles Manning n = dev->n_erased_blocks * dev->param.chunks_per_block; 482753ac610SCharles Manning 483753ac610SCharles Manning if (dev->alloc_block > 0) 484753ac610SCharles Manning n += (dev->param.chunks_per_block - dev->alloc_page); 485753ac610SCharles Manning 486753ac610SCharles Manning return n; 487753ac610SCharles Manning 488753ac610SCharles Manning } 489753ac610SCharles Manning 490753ac610SCharles Manning /* 491753ac610SCharles Manning * yaffs_skip_rest_of_block() skips over the rest of the allocation block 492753ac610SCharles Manning * if we don't want to write to it. 493753ac610SCharles Manning */ 494753ac610SCharles Manning void yaffs_skip_rest_of_block(struct yaffs_dev *dev) 495753ac610SCharles Manning { 496753ac610SCharles Manning struct yaffs_block_info *bi; 497753ac610SCharles Manning 498753ac610SCharles Manning if (dev->alloc_block > 0) { 499753ac610SCharles Manning bi = yaffs_get_block_info(dev, dev->alloc_block); 500753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) { 501753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_FULL; 502753ac610SCharles Manning dev->alloc_block = -1; 503753ac610SCharles Manning } 504753ac610SCharles Manning } 505753ac610SCharles Manning } 506753ac610SCharles Manning 507753ac610SCharles Manning static int yaffs_write_new_chunk(struct yaffs_dev *dev, 508753ac610SCharles Manning const u8 *data, 509753ac610SCharles Manning struct yaffs_ext_tags *tags, int use_reserver) 5100e8cc8bdSWilliam Juul { 5110e8cc8bdSWilliam Juul int attempts = 0; 512753ac610SCharles Manning int write_ok = 0; 5130e8cc8bdSWilliam Juul int chunk; 5140e8cc8bdSWilliam Juul 515753ac610SCharles Manning yaffs2_checkpt_invalidate(dev); 5160e8cc8bdSWilliam Juul 5170e8cc8bdSWilliam Juul do { 518753ac610SCharles Manning struct yaffs_block_info *bi = 0; 519753ac610SCharles Manning int erased_ok = 0; 5200e8cc8bdSWilliam Juul 521753ac610SCharles Manning chunk = yaffs_alloc_chunk(dev, use_reserver, &bi); 5220e8cc8bdSWilliam Juul if (chunk < 0) { 5230e8cc8bdSWilliam Juul /* no space */ 5240e8cc8bdSWilliam Juul break; 5250e8cc8bdSWilliam Juul } 5260e8cc8bdSWilliam Juul 5270e8cc8bdSWilliam Juul /* First check this chunk is erased, if it needs 5280e8cc8bdSWilliam Juul * checking. The checking policy (unless forced 5290e8cc8bdSWilliam Juul * always on) is as follows: 5300e8cc8bdSWilliam Juul * 5310e8cc8bdSWilliam Juul * Check the first page we try to write in a block. 5320e8cc8bdSWilliam Juul * If the check passes then we don't need to check any 5330e8cc8bdSWilliam Juul * more. If the check fails, we check again... 5340e8cc8bdSWilliam Juul * If the block has been erased, we don't need to check. 5350e8cc8bdSWilliam Juul * 5360e8cc8bdSWilliam Juul * However, if the block has been prioritised for gc, 5370e8cc8bdSWilliam Juul * then we think there might be something odd about 5380e8cc8bdSWilliam Juul * this block and stop using it. 5390e8cc8bdSWilliam Juul * 5400e8cc8bdSWilliam Juul * Rationale: We should only ever see chunks that have 5410e8cc8bdSWilliam Juul * not been erased if there was a partially written 5420e8cc8bdSWilliam Juul * chunk due to power loss. This checking policy should 5430e8cc8bdSWilliam Juul * catch that case with very few checks and thus save a 5440e8cc8bdSWilliam Juul * lot of checks that are most likely not needed. 545753ac610SCharles Manning * 546753ac610SCharles Manning * Mods to the above 547753ac610SCharles Manning * If an erase check fails or the write fails we skip the 548753ac610SCharles Manning * rest of the block. 5490e8cc8bdSWilliam Juul */ 5500e8cc8bdSWilliam Juul 5510e8cc8bdSWilliam Juul /* let's give it a try */ 5520e8cc8bdSWilliam Juul attempts++; 5530e8cc8bdSWilliam Juul 554753ac610SCharles Manning if (dev->param.always_check_erased) 555753ac610SCharles Manning bi->skip_erased_check = 0; 5560e8cc8bdSWilliam Juul 557753ac610SCharles Manning if (!bi->skip_erased_check) { 558753ac610SCharles Manning erased_ok = yaffs_check_chunk_erased(dev, chunk); 559753ac610SCharles Manning if (erased_ok != YAFFS_OK) { 560753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 561753ac610SCharles Manning "**>> yaffs chunk %d was not erased", 562753ac610SCharles Manning chunk); 563753ac610SCharles Manning 564753ac610SCharles Manning /* If not erased, delete this one, 565753ac610SCharles Manning * skip rest of block and 566753ac610SCharles Manning * try another chunk */ 567753ac610SCharles Manning yaffs_chunk_del(dev, chunk, 1, __LINE__); 568753ac610SCharles Manning yaffs_skip_rest_of_block(dev); 5690e8cc8bdSWilliam Juul continue; 5700e8cc8bdSWilliam Juul } 5710e8cc8bdSWilliam Juul } 5720e8cc8bdSWilliam Juul 573753ac610SCharles Manning write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags); 574753ac610SCharles Manning 575753ac610SCharles Manning if (!bi->skip_erased_check) 576753ac610SCharles Manning write_ok = 577753ac610SCharles Manning yaffs_verify_chunk_written(dev, chunk, data, tags); 578753ac610SCharles Manning 579753ac610SCharles Manning if (write_ok != YAFFS_OK) { 580753ac610SCharles Manning /* Clean up aborted write, skip to next block and 581753ac610SCharles Manning * try another chunk */ 582753ac610SCharles Manning yaffs_handle_chunk_wr_error(dev, chunk, erased_ok); 5830e8cc8bdSWilliam Juul continue; 5840e8cc8bdSWilliam Juul } 5850e8cc8bdSWilliam Juul 586753ac610SCharles Manning bi->skip_erased_check = 1; 587753ac610SCharles Manning 5880e8cc8bdSWilliam Juul /* Copy the data into the robustification buffer */ 589753ac610SCharles Manning yaffs_handle_chunk_wr_ok(dev, chunk, data, tags); 5900e8cc8bdSWilliam Juul 591753ac610SCharles Manning } while (write_ok != YAFFS_OK && 5920e8cc8bdSWilliam Juul (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts)); 5930e8cc8bdSWilliam Juul 594753ac610SCharles Manning if (!write_ok) 5950e8cc8bdSWilliam Juul chunk = -1; 5960e8cc8bdSWilliam Juul 5970e8cc8bdSWilliam Juul if (attempts > 1) { 598753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 599753ac610SCharles Manning "**>> yaffs write required %d attempts", 600753ac610SCharles Manning attempts); 601753ac610SCharles Manning dev->n_retried_writes += (attempts - 1); 6020e8cc8bdSWilliam Juul } 6030e8cc8bdSWilliam Juul 6040e8cc8bdSWilliam Juul return chunk; 6050e8cc8bdSWilliam Juul } 6060e8cc8bdSWilliam Juul 6070e8cc8bdSWilliam Juul /* 6080e8cc8bdSWilliam Juul * Block retiring for handling a broken block. 6090e8cc8bdSWilliam Juul */ 6100e8cc8bdSWilliam Juul 611753ac610SCharles Manning static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block) 6120e8cc8bdSWilliam Juul { 613753ac610SCharles Manning struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block); 6140e8cc8bdSWilliam Juul 615753ac610SCharles Manning yaffs2_checkpt_invalidate(dev); 6160e8cc8bdSWilliam Juul 617753ac610SCharles Manning yaffs2_clear_oldest_dirty_seq(dev, bi); 6180e8cc8bdSWilliam Juul 619753ac610SCharles Manning if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) { 620753ac610SCharles Manning if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) { 621753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 622753ac610SCharles Manning "yaffs: Failed to mark bad and erase block %d", 623753ac610SCharles Manning flash_block); 624753ac610SCharles Manning } else { 625753ac610SCharles Manning struct yaffs_ext_tags tags; 626753ac610SCharles Manning int chunk_id = 627753ac610SCharles Manning flash_block * dev->param.chunks_per_block; 6280e8cc8bdSWilliam Juul 629753ac610SCharles Manning u8 *buffer = yaffs_get_temp_buffer(dev); 6300e8cc8bdSWilliam Juul 631753ac610SCharles Manning memset(buffer, 0xff, dev->data_bytes_per_chunk); 632753ac610SCharles Manning memset(&tags, 0, sizeof(tags)); 633753ac610SCharles Manning tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK; 634753ac610SCharles Manning if (dev->param.write_chunk_tags_fn(dev, chunk_id - 635753ac610SCharles Manning dev->chunk_offset, 636753ac610SCharles Manning buffer, 637753ac610SCharles Manning &tags) != YAFFS_OK) 638753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 639753ac610SCharles Manning "yaffs: Failed to write bad block marker to block %d", 640753ac610SCharles Manning flash_block); 6410e8cc8bdSWilliam Juul 642753ac610SCharles Manning yaffs_release_temp_buffer(dev, buffer); 6430e8cc8bdSWilliam Juul } 6440e8cc8bdSWilliam Juul } 6450e8cc8bdSWilliam Juul 646753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_DEAD; 647753ac610SCharles Manning bi->gc_prioritise = 0; 648753ac610SCharles Manning bi->needs_retiring = 0; 6490e8cc8bdSWilliam Juul 650753ac610SCharles Manning dev->n_retired_blocks++; 6510e8cc8bdSWilliam Juul } 6520e8cc8bdSWilliam Juul 6530e8cc8bdSWilliam Juul /*---------------- Name handling functions ------------*/ 6540e8cc8bdSWilliam Juul 655753ac610SCharles Manning static u16 yaffs_calc_name_sum(const YCHAR *name) 6560e8cc8bdSWilliam Juul { 657753ac610SCharles Manning u16 sum = 0; 658753ac610SCharles Manning u16 i = 1; 6590e8cc8bdSWilliam Juul 660753ac610SCharles Manning if (!name) 661753ac610SCharles Manning return 0; 6620e8cc8bdSWilliam Juul 663753ac610SCharles Manning while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) { 664753ac610SCharles Manning 665753ac610SCharles Manning /* 0x1f mask is case insensitive */ 666753ac610SCharles Manning sum += ((*name) & 0x1f) * i; 6670e8cc8bdSWilliam Juul i++; 668753ac610SCharles Manning name++; 6690e8cc8bdSWilliam Juul } 6700e8cc8bdSWilliam Juul return sum; 6710e8cc8bdSWilliam Juul } 6720e8cc8bdSWilliam Juul 673753ac610SCharles Manning void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name) 6740e8cc8bdSWilliam Juul { 675753ac610SCharles Manning memset(obj->short_name, 0, sizeof(obj->short_name)); 676753ac610SCharles Manning if (name && 677753ac610SCharles Manning yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <= 678753ac610SCharles Manning YAFFS_SHORT_NAME_LENGTH) 679753ac610SCharles Manning yaffs_strcpy(obj->short_name, name); 680753ac610SCharles Manning else 681753ac610SCharles Manning obj->short_name[0] = _Y('\0'); 682753ac610SCharles Manning obj->sum = yaffs_calc_name_sum(name); 6830e8cc8bdSWilliam Juul } 684753ac610SCharles Manning 685753ac610SCharles Manning void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj, 686753ac610SCharles Manning const struct yaffs_obj_hdr *oh) 687753ac610SCharles Manning { 688753ac610SCharles Manning #ifdef CONFIG_YAFFS_AUTO_UNICODE 689753ac610SCharles Manning YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1]; 690753ac610SCharles Manning memset(tmp_name, 0, sizeof(tmp_name)); 691753ac610SCharles Manning yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name, 692753ac610SCharles Manning YAFFS_MAX_NAME_LENGTH + 1); 693753ac610SCharles Manning yaffs_set_obj_name(obj, tmp_name); 694753ac610SCharles Manning #else 695753ac610SCharles Manning yaffs_set_obj_name(obj, oh->name); 6960e8cc8bdSWilliam Juul #endif 697753ac610SCharles Manning } 698753ac610SCharles Manning 699753ac610SCharles Manning loff_t yaffs_max_file_size(struct yaffs_dev *dev) 700753ac610SCharles Manning { 701753ac610SCharles Manning return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk; 7020e8cc8bdSWilliam Juul } 7030e8cc8bdSWilliam Juul 7040e8cc8bdSWilliam Juul /*-------------------- TNODES ------------------- 7050e8cc8bdSWilliam Juul 7060e8cc8bdSWilliam Juul * List of spare tnodes 7070e8cc8bdSWilliam Juul * The list is hooked together using the first pointer 7080e8cc8bdSWilliam Juul * in the tnode. 7090e8cc8bdSWilliam Juul */ 7100e8cc8bdSWilliam Juul 711753ac610SCharles Manning struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev) 7120e8cc8bdSWilliam Juul { 713753ac610SCharles Manning struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev); 7140e8cc8bdSWilliam Juul 715753ac610SCharles Manning if (tn) { 716753ac610SCharles Manning memset(tn, 0, dev->tnode_size); 717753ac610SCharles Manning dev->n_tnodes++; 7180e8cc8bdSWilliam Juul } 7190e8cc8bdSWilliam Juul 720753ac610SCharles Manning dev->checkpoint_blocks_required = 0; /* force recalculation */ 7210e8cc8bdSWilliam Juul 7220e8cc8bdSWilliam Juul return tn; 7230e8cc8bdSWilliam Juul } 7240e8cc8bdSWilliam Juul 7250e8cc8bdSWilliam Juul /* FreeTnode frees up a tnode and puts it back on the free list */ 726753ac610SCharles Manning static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn) 7270e8cc8bdSWilliam Juul { 728753ac610SCharles Manning yaffs_free_raw_tnode(dev, tn); 729753ac610SCharles Manning dev->n_tnodes--; 730753ac610SCharles Manning dev->checkpoint_blocks_required = 0; /* force recalculation */ 7310e8cc8bdSWilliam Juul } 7320e8cc8bdSWilliam Juul 733753ac610SCharles Manning static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev) 7340e8cc8bdSWilliam Juul { 735753ac610SCharles Manning yaffs_deinit_raw_tnodes_and_objs(dev); 736753ac610SCharles Manning dev->n_obj = 0; 737753ac610SCharles Manning dev->n_tnodes = 0; 7380e8cc8bdSWilliam Juul } 7390e8cc8bdSWilliam Juul 740753ac610SCharles Manning void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn, 741753ac610SCharles Manning unsigned pos, unsigned val) 7420e8cc8bdSWilliam Juul { 743753ac610SCharles Manning u32 *map = (u32 *) tn; 744753ac610SCharles Manning u32 bit_in_map; 745753ac610SCharles Manning u32 bit_in_word; 746753ac610SCharles Manning u32 word_in_map; 747753ac610SCharles Manning u32 mask; 7480e8cc8bdSWilliam Juul 7490e8cc8bdSWilliam Juul pos &= YAFFS_TNODES_LEVEL0_MASK; 750753ac610SCharles Manning val >>= dev->chunk_grp_bits; 7510e8cc8bdSWilliam Juul 752753ac610SCharles Manning bit_in_map = pos * dev->tnode_width; 753753ac610SCharles Manning word_in_map = bit_in_map / 32; 754753ac610SCharles Manning bit_in_word = bit_in_map & (32 - 1); 7550e8cc8bdSWilliam Juul 756753ac610SCharles Manning mask = dev->tnode_mask << bit_in_word; 7570e8cc8bdSWilliam Juul 758753ac610SCharles Manning map[word_in_map] &= ~mask; 759753ac610SCharles Manning map[word_in_map] |= (mask & (val << bit_in_word)); 7600e8cc8bdSWilliam Juul 761753ac610SCharles Manning if (dev->tnode_width > (32 - bit_in_word)) { 762753ac610SCharles Manning bit_in_word = (32 - bit_in_word); 763753ac610SCharles Manning word_in_map++; 764753ac610SCharles Manning mask = 765753ac610SCharles Manning dev->tnode_mask >> bit_in_word; 766753ac610SCharles Manning map[word_in_map] &= ~mask; 767753ac610SCharles Manning map[word_in_map] |= (mask & (val >> bit_in_word)); 7680e8cc8bdSWilliam Juul } 7690e8cc8bdSWilliam Juul } 7700e8cc8bdSWilliam Juul 771753ac610SCharles Manning u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn, 772753ac610SCharles Manning unsigned pos) 7730e8cc8bdSWilliam Juul { 774753ac610SCharles Manning u32 *map = (u32 *) tn; 775753ac610SCharles Manning u32 bit_in_map; 776753ac610SCharles Manning u32 bit_in_word; 777753ac610SCharles Manning u32 word_in_map; 778753ac610SCharles Manning u32 val; 7790e8cc8bdSWilliam Juul 7800e8cc8bdSWilliam Juul pos &= YAFFS_TNODES_LEVEL0_MASK; 7810e8cc8bdSWilliam Juul 782753ac610SCharles Manning bit_in_map = pos * dev->tnode_width; 783753ac610SCharles Manning word_in_map = bit_in_map / 32; 784753ac610SCharles Manning bit_in_word = bit_in_map & (32 - 1); 7850e8cc8bdSWilliam Juul 786753ac610SCharles Manning val = map[word_in_map] >> bit_in_word; 7870e8cc8bdSWilliam Juul 788753ac610SCharles Manning if (dev->tnode_width > (32 - bit_in_word)) { 789753ac610SCharles Manning bit_in_word = (32 - bit_in_word); 790753ac610SCharles Manning word_in_map++; 791753ac610SCharles Manning val |= (map[word_in_map] << bit_in_word); 7920e8cc8bdSWilliam Juul } 7930e8cc8bdSWilliam Juul 794753ac610SCharles Manning val &= dev->tnode_mask; 795753ac610SCharles Manning val <<= dev->chunk_grp_bits; 7960e8cc8bdSWilliam Juul 7970e8cc8bdSWilliam Juul return val; 7980e8cc8bdSWilliam Juul } 7990e8cc8bdSWilliam Juul 8000e8cc8bdSWilliam Juul /* ------------------- End of individual tnode manipulation -----------------*/ 8010e8cc8bdSWilliam Juul 8020e8cc8bdSWilliam Juul /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------ 803753ac610SCharles Manning * The look up tree is represented by the top tnode and the number of top_level 8040e8cc8bdSWilliam Juul * in the tree. 0 means only the level 0 tnode is in the tree. 8050e8cc8bdSWilliam Juul */ 8060e8cc8bdSWilliam Juul 8070e8cc8bdSWilliam Juul /* FindLevel0Tnode finds the level 0 tnode, if one exists. */ 808753ac610SCharles Manning struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev, 809753ac610SCharles Manning struct yaffs_file_var *file_struct, 810753ac610SCharles Manning u32 chunk_id) 8110e8cc8bdSWilliam Juul { 812753ac610SCharles Manning struct yaffs_tnode *tn = file_struct->top; 813753ac610SCharles Manning u32 i; 814753ac610SCharles Manning int required_depth; 815753ac610SCharles Manning int level = file_struct->top_level; 8160e8cc8bdSWilliam Juul 817753ac610SCharles Manning dev = dev; 8180e8cc8bdSWilliam Juul 8190e8cc8bdSWilliam Juul /* Check sane level and chunk Id */ 820753ac610SCharles Manning if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) 8210e8cc8bdSWilliam Juul return NULL; 8220e8cc8bdSWilliam Juul 823753ac610SCharles Manning if (chunk_id > YAFFS_MAX_CHUNK_ID) 8240e8cc8bdSWilliam Juul return NULL; 8250e8cc8bdSWilliam Juul 826753ac610SCharles Manning /* First check we're tall enough (ie enough top_level) */ 8270e8cc8bdSWilliam Juul 828753ac610SCharles Manning i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS; 829753ac610SCharles Manning required_depth = 0; 8300e8cc8bdSWilliam Juul while (i) { 8310e8cc8bdSWilliam Juul i >>= YAFFS_TNODES_INTERNAL_BITS; 832753ac610SCharles Manning required_depth++; 8330e8cc8bdSWilliam Juul } 8340e8cc8bdSWilliam Juul 835753ac610SCharles Manning if (required_depth > file_struct->top_level) 836753ac610SCharles Manning return NULL; /* Not tall enough, so we can't find it */ 8370e8cc8bdSWilliam Juul 8380e8cc8bdSWilliam Juul /* Traverse down to level 0 */ 8390e8cc8bdSWilliam Juul while (level > 0 && tn) { 840753ac610SCharles Manning tn = tn->internal[(chunk_id >> 8410e8cc8bdSWilliam Juul (YAFFS_TNODES_LEVEL0_BITS + 8420e8cc8bdSWilliam Juul (level - 1) * 843753ac610SCharles Manning YAFFS_TNODES_INTERNAL_BITS)) & 8440e8cc8bdSWilliam Juul YAFFS_TNODES_INTERNAL_MASK]; 8450e8cc8bdSWilliam Juul level--; 8460e8cc8bdSWilliam Juul } 8470e8cc8bdSWilliam Juul 8480e8cc8bdSWilliam Juul return tn; 8490e8cc8bdSWilliam Juul } 8500e8cc8bdSWilliam Juul 851753ac610SCharles Manning /* add_find_tnode_0 finds the level 0 tnode if it exists, 852753ac610SCharles Manning * otherwise first expands the tree. 8530e8cc8bdSWilliam Juul * This happens in two steps: 8540e8cc8bdSWilliam Juul * 1. If the tree isn't tall enough, then make it taller. 8550e8cc8bdSWilliam Juul * 2. Scan down the tree towards the level 0 tnode adding tnodes if required. 8560e8cc8bdSWilliam Juul * 8570e8cc8bdSWilliam Juul * Used when modifying the tree. 8580e8cc8bdSWilliam Juul * 859753ac610SCharles Manning * If the tn argument is NULL, then a fresh tnode will be added otherwise the 860753ac610SCharles Manning * specified tn will be plugged into the ttree. 8610e8cc8bdSWilliam Juul */ 8620e8cc8bdSWilliam Juul 863753ac610SCharles Manning struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev, 864753ac610SCharles Manning struct yaffs_file_var *file_struct, 865753ac610SCharles Manning u32 chunk_id, 866753ac610SCharles Manning struct yaffs_tnode *passed_tn) 8670e8cc8bdSWilliam Juul { 868753ac610SCharles Manning int required_depth; 8690e8cc8bdSWilliam Juul int i; 8700e8cc8bdSWilliam Juul int l; 871753ac610SCharles Manning struct yaffs_tnode *tn; 872753ac610SCharles Manning u32 x; 8730e8cc8bdSWilliam Juul 8740e8cc8bdSWilliam Juul /* Check sane level and page Id */ 875753ac610SCharles Manning if (file_struct->top_level < 0 || 876753ac610SCharles Manning file_struct->top_level > YAFFS_TNODES_MAX_LEVEL) 8770e8cc8bdSWilliam Juul return NULL; 8780e8cc8bdSWilliam Juul 879753ac610SCharles Manning if (chunk_id > YAFFS_MAX_CHUNK_ID) 8800e8cc8bdSWilliam Juul return NULL; 8810e8cc8bdSWilliam Juul 882753ac610SCharles Manning /* First check we're tall enough (ie enough top_level) */ 8830e8cc8bdSWilliam Juul 884753ac610SCharles Manning x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS; 885753ac610SCharles Manning required_depth = 0; 8860e8cc8bdSWilliam Juul while (x) { 8870e8cc8bdSWilliam Juul x >>= YAFFS_TNODES_INTERNAL_BITS; 888753ac610SCharles Manning required_depth++; 8890e8cc8bdSWilliam Juul } 8900e8cc8bdSWilliam Juul 891753ac610SCharles Manning if (required_depth > file_struct->top_level) { 8920e8cc8bdSWilliam Juul /* Not tall enough, gotta make the tree taller */ 893753ac610SCharles Manning for (i = file_struct->top_level; i < required_depth; i++) { 8940e8cc8bdSWilliam Juul 895753ac610SCharles Manning tn = yaffs_get_tnode(dev); 8960e8cc8bdSWilliam Juul 8970e8cc8bdSWilliam Juul if (tn) { 898753ac610SCharles Manning tn->internal[0] = file_struct->top; 899753ac610SCharles Manning file_struct->top = tn; 900753ac610SCharles Manning file_struct->top_level++; 9010e8cc8bdSWilliam Juul } else { 902753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 903753ac610SCharles Manning "yaffs: no more tnodes"); 904753ac610SCharles Manning return NULL; 9050e8cc8bdSWilliam Juul } 9060e8cc8bdSWilliam Juul } 9070e8cc8bdSWilliam Juul } 9080e8cc8bdSWilliam Juul 9090e8cc8bdSWilliam Juul /* Traverse down to level 0, adding anything we need */ 9100e8cc8bdSWilliam Juul 911753ac610SCharles Manning l = file_struct->top_level; 912753ac610SCharles Manning tn = file_struct->top; 9130e8cc8bdSWilliam Juul 9140e8cc8bdSWilliam Juul if (l > 0) { 9150e8cc8bdSWilliam Juul while (l > 0 && tn) { 916753ac610SCharles Manning x = (chunk_id >> 9170e8cc8bdSWilliam Juul (YAFFS_TNODES_LEVEL0_BITS + 9180e8cc8bdSWilliam Juul (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) & 9190e8cc8bdSWilliam Juul YAFFS_TNODES_INTERNAL_MASK; 9200e8cc8bdSWilliam Juul 9210e8cc8bdSWilliam Juul if ((l > 1) && !tn->internal[x]) { 9220e8cc8bdSWilliam Juul /* Add missing non-level-zero tnode */ 923753ac610SCharles Manning tn->internal[x] = yaffs_get_tnode(dev); 924753ac610SCharles Manning if (!tn->internal[x]) 925753ac610SCharles Manning return NULL; 9260e8cc8bdSWilliam Juul } else if (l == 1) { 9270e8cc8bdSWilliam Juul /* Looking from level 1 at level 0 */ 928753ac610SCharles Manning if (passed_tn) { 929753ac610SCharles Manning /* If we already have one, release it */ 9300e8cc8bdSWilliam Juul if (tn->internal[x]) 931753ac610SCharles Manning yaffs_free_tnode(dev, 932753ac610SCharles Manning tn->internal[x]); 933753ac610SCharles Manning tn->internal[x] = passed_tn; 9340e8cc8bdSWilliam Juul 9350e8cc8bdSWilliam Juul } else if (!tn->internal[x]) { 9360e8cc8bdSWilliam Juul /* Don't have one, none passed in */ 937753ac610SCharles Manning tn->internal[x] = yaffs_get_tnode(dev); 938753ac610SCharles Manning if (!tn->internal[x]) 939753ac610SCharles Manning return NULL; 9400e8cc8bdSWilliam Juul } 9410e8cc8bdSWilliam Juul } 9420e8cc8bdSWilliam Juul 9430e8cc8bdSWilliam Juul tn = tn->internal[x]; 9440e8cc8bdSWilliam Juul l--; 9450e8cc8bdSWilliam Juul } 9460e8cc8bdSWilliam Juul } else { 9470e8cc8bdSWilliam Juul /* top is level 0 */ 948753ac610SCharles Manning if (passed_tn) { 949753ac610SCharles Manning memcpy(tn, passed_tn, 950753ac610SCharles Manning (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8); 951753ac610SCharles Manning yaffs_free_tnode(dev, passed_tn); 9520e8cc8bdSWilliam Juul } 9530e8cc8bdSWilliam Juul } 9540e8cc8bdSWilliam Juul 9550e8cc8bdSWilliam Juul return tn; 9560e8cc8bdSWilliam Juul } 9570e8cc8bdSWilliam Juul 958753ac610SCharles Manning static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id, 959753ac610SCharles Manning int chunk_obj) 960753ac610SCharles Manning { 961753ac610SCharles Manning return (tags->chunk_id == chunk_obj && 962753ac610SCharles Manning tags->obj_id == obj_id && 963753ac610SCharles Manning !tags->is_deleted) ? 1 : 0; 964753ac610SCharles Manning 965753ac610SCharles Manning } 966753ac610SCharles Manning 967753ac610SCharles Manning static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk, 968753ac610SCharles Manning struct yaffs_ext_tags *tags, int obj_id, 969753ac610SCharles Manning int inode_chunk) 9700e8cc8bdSWilliam Juul { 9710e8cc8bdSWilliam Juul int j; 9720e8cc8bdSWilliam Juul 973753ac610SCharles Manning for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) { 974753ac610SCharles Manning if (yaffs_check_chunk_bit 975753ac610SCharles Manning (dev, the_chunk / dev->param.chunks_per_block, 976753ac610SCharles Manning the_chunk % dev->param.chunks_per_block)) { 9770e8cc8bdSWilliam Juul 978753ac610SCharles Manning if (dev->chunk_grp_size == 1) 979753ac610SCharles Manning return the_chunk; 980753ac610SCharles Manning else { 981753ac610SCharles Manning yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL, 982753ac610SCharles Manning tags); 983753ac610SCharles Manning if (yaffs_tags_match(tags, 984753ac610SCharles Manning obj_id, inode_chunk)) { 985753ac610SCharles Manning /* found it; */ 986753ac610SCharles Manning return the_chunk; 9870e8cc8bdSWilliam Juul } 9880e8cc8bdSWilliam Juul } 989753ac610SCharles Manning } 990753ac610SCharles Manning the_chunk++; 9910e8cc8bdSWilliam Juul } 9920e8cc8bdSWilliam Juul return -1; 9930e8cc8bdSWilliam Juul } 9940e8cc8bdSWilliam Juul 995753ac610SCharles Manning static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk, 996753ac610SCharles Manning struct yaffs_ext_tags *tags) 9970e8cc8bdSWilliam Juul { 998753ac610SCharles Manning /*Get the Tnode, then get the level 0 offset chunk offset */ 999753ac610SCharles Manning struct yaffs_tnode *tn; 1000753ac610SCharles Manning int the_chunk = -1; 1001753ac610SCharles Manning struct yaffs_ext_tags local_tags; 1002753ac610SCharles Manning int ret_val = -1; 1003753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev; 10040e8cc8bdSWilliam Juul 1005753ac610SCharles Manning if (!tags) { 1006753ac610SCharles Manning /* Passed a NULL, so use our own tags space */ 1007753ac610SCharles Manning tags = &local_tags; 10080e8cc8bdSWilliam Juul } 10090e8cc8bdSWilliam Juul 1010753ac610SCharles Manning tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk); 1011753ac610SCharles Manning 1012753ac610SCharles Manning if (!tn) 1013753ac610SCharles Manning return ret_val; 1014753ac610SCharles Manning 1015753ac610SCharles Manning the_chunk = yaffs_get_group_base(dev, tn, inode_chunk); 1016753ac610SCharles Manning 1017753ac610SCharles Manning ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id, 1018753ac610SCharles Manning inode_chunk); 1019753ac610SCharles Manning return ret_val; 1020753ac610SCharles Manning } 1021753ac610SCharles Manning 1022753ac610SCharles Manning static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk, 1023753ac610SCharles Manning struct yaffs_ext_tags *tags) 1024753ac610SCharles Manning { 1025753ac610SCharles Manning /* Get the Tnode, then get the level 0 offset chunk offset */ 1026753ac610SCharles Manning struct yaffs_tnode *tn; 1027753ac610SCharles Manning int the_chunk = -1; 1028753ac610SCharles Manning struct yaffs_ext_tags local_tags; 1029753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev; 1030753ac610SCharles Manning int ret_val = -1; 1031753ac610SCharles Manning 1032753ac610SCharles Manning if (!tags) { 1033753ac610SCharles Manning /* Passed a NULL, so use our own tags space */ 1034753ac610SCharles Manning tags = &local_tags; 1035753ac610SCharles Manning } 1036753ac610SCharles Manning 1037753ac610SCharles Manning tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk); 1038753ac610SCharles Manning 1039753ac610SCharles Manning if (!tn) 1040753ac610SCharles Manning return ret_val; 1041753ac610SCharles Manning 1042753ac610SCharles Manning the_chunk = yaffs_get_group_base(dev, tn, inode_chunk); 1043753ac610SCharles Manning 1044753ac610SCharles Manning ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id, 1045753ac610SCharles Manning inode_chunk); 1046753ac610SCharles Manning 1047753ac610SCharles Manning /* Delete the entry in the filestructure (if found) */ 1048753ac610SCharles Manning if (ret_val != -1) 1049753ac610SCharles Manning yaffs_load_tnode_0(dev, tn, inode_chunk, 0); 1050753ac610SCharles Manning 1051753ac610SCharles Manning return ret_val; 1052753ac610SCharles Manning } 1053753ac610SCharles Manning 1054753ac610SCharles Manning int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk, 1055753ac610SCharles Manning int nand_chunk, int in_scan) 1056753ac610SCharles Manning { 1057753ac610SCharles Manning /* NB in_scan is zero unless scanning. 1058753ac610SCharles Manning * For forward scanning, in_scan is > 0; 1059753ac610SCharles Manning * for backward scanning in_scan is < 0 1060753ac610SCharles Manning * 1061753ac610SCharles Manning * nand_chunk = 0 is a dummy insert to make sure the tnodes are there. 10620e8cc8bdSWilliam Juul */ 10630e8cc8bdSWilliam Juul 1064753ac610SCharles Manning struct yaffs_tnode *tn; 1065753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev; 1066753ac610SCharles Manning int existing_cunk; 1067753ac610SCharles Manning struct yaffs_ext_tags existing_tags; 1068753ac610SCharles Manning struct yaffs_ext_tags new_tags; 1069753ac610SCharles Manning unsigned existing_serial, new_serial; 1070753ac610SCharles Manning 1071753ac610SCharles Manning if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) { 1072753ac610SCharles Manning /* Just ignore an attempt at putting a chunk into a non-file 1073753ac610SCharles Manning * during scanning. 1074753ac610SCharles Manning * If it is not during Scanning then something went wrong! 1075753ac610SCharles Manning */ 1076753ac610SCharles Manning if (!in_scan) { 1077753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 1078753ac610SCharles Manning "yaffs tragedy:attempt to put data chunk into a non-file" 1079753ac610SCharles Manning ); 1080753ac610SCharles Manning BUG(); 1081753ac610SCharles Manning } 1082753ac610SCharles Manning 1083753ac610SCharles Manning yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); 1084753ac610SCharles Manning return YAFFS_OK; 1085753ac610SCharles Manning } 1086753ac610SCharles Manning 1087753ac610SCharles Manning tn = yaffs_add_find_tnode_0(dev, 1088753ac610SCharles Manning &in->variant.file_variant, 1089753ac610SCharles Manning inode_chunk, NULL); 1090753ac610SCharles Manning if (!tn) 1091753ac610SCharles Manning return YAFFS_FAIL; 1092753ac610SCharles Manning 1093753ac610SCharles Manning if (!nand_chunk) 1094753ac610SCharles Manning /* Dummy insert, bail now */ 1095753ac610SCharles Manning return YAFFS_OK; 1096753ac610SCharles Manning 1097753ac610SCharles Manning existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk); 1098753ac610SCharles Manning 1099753ac610SCharles Manning if (in_scan != 0) { 1100753ac610SCharles Manning /* If we're scanning then we need to test for duplicates 1101753ac610SCharles Manning * NB This does not need to be efficient since it should only 1102753ac610SCharles Manning * happen when the power fails during a write, then only one 1103753ac610SCharles Manning * chunk should ever be affected. 1104753ac610SCharles Manning * 1105753ac610SCharles Manning * Correction for YAFFS2: This could happen quite a lot and we 1106753ac610SCharles Manning * need to think about efficiency! TODO 1107753ac610SCharles Manning * Update: For backward scanning we don't need to re-read tags 1108753ac610SCharles Manning * so this is quite cheap. 1109753ac610SCharles Manning */ 1110753ac610SCharles Manning 1111753ac610SCharles Manning if (existing_cunk > 0) { 1112753ac610SCharles Manning /* NB Right now existing chunk will not be real 1113753ac610SCharles Manning * chunk_id if the chunk group size > 1 1114753ac610SCharles Manning * thus we have to do a FindChunkInFile to get the 1115753ac610SCharles Manning * real chunk id. 1116753ac610SCharles Manning * 1117753ac610SCharles Manning * We have a duplicate now we need to decide which 1118753ac610SCharles Manning * one to use: 1119753ac610SCharles Manning * 1120753ac610SCharles Manning * Backwards scanning YAFFS2: The old one is what 1121753ac610SCharles Manning * we use, dump the new one. 1122753ac610SCharles Manning * YAFFS1: Get both sets of tags and compare serial 1123753ac610SCharles Manning * numbers. 1124753ac610SCharles Manning */ 1125753ac610SCharles Manning 1126753ac610SCharles Manning if (in_scan > 0) { 1127753ac610SCharles Manning /* Only do this for forward scanning */ 1128753ac610SCharles Manning yaffs_rd_chunk_tags_nand(dev, 1129753ac610SCharles Manning nand_chunk, 1130753ac610SCharles Manning NULL, &new_tags); 1131753ac610SCharles Manning 1132753ac610SCharles Manning /* Do a proper find */ 1133753ac610SCharles Manning existing_cunk = 1134753ac610SCharles Manning yaffs_find_chunk_in_file(in, inode_chunk, 1135753ac610SCharles Manning &existing_tags); 1136753ac610SCharles Manning } 1137753ac610SCharles Manning 1138753ac610SCharles Manning if (existing_cunk <= 0) { 1139753ac610SCharles Manning /*Hoosterman - how did this happen? */ 1140753ac610SCharles Manning 1141753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 1142753ac610SCharles Manning "yaffs tragedy: existing chunk < 0 in scan" 1143753ac610SCharles Manning ); 1144753ac610SCharles Manning 1145753ac610SCharles Manning } 1146753ac610SCharles Manning 1147753ac610SCharles Manning /* NB The deleted flags should be false, otherwise 1148753ac610SCharles Manning * the chunks will not be loaded during a scan 1149753ac610SCharles Manning */ 1150753ac610SCharles Manning 1151753ac610SCharles Manning if (in_scan > 0) { 1152753ac610SCharles Manning new_serial = new_tags.serial_number; 1153753ac610SCharles Manning existing_serial = existing_tags.serial_number; 1154753ac610SCharles Manning } 1155753ac610SCharles Manning 1156753ac610SCharles Manning if ((in_scan > 0) && 1157753ac610SCharles Manning (existing_cunk <= 0 || 1158753ac610SCharles Manning ((existing_serial + 1) & 3) == new_serial)) { 1159753ac610SCharles Manning /* Forward scanning. 1160753ac610SCharles Manning * Use new 1161753ac610SCharles Manning * Delete the old one and drop through to 1162753ac610SCharles Manning * update the tnode 1163753ac610SCharles Manning */ 1164753ac610SCharles Manning yaffs_chunk_del(dev, existing_cunk, 1, 1165753ac610SCharles Manning __LINE__); 1166753ac610SCharles Manning } else { 1167753ac610SCharles Manning /* Backward scanning or we want to use the 1168753ac610SCharles Manning * existing one 1169753ac610SCharles Manning * Delete the new one and return early so that 1170753ac610SCharles Manning * the tnode isn't changed 1171753ac610SCharles Manning */ 1172753ac610SCharles Manning yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); 1173753ac610SCharles Manning return YAFFS_OK; 1174753ac610SCharles Manning } 1175753ac610SCharles Manning } 1176753ac610SCharles Manning 1177753ac610SCharles Manning } 1178753ac610SCharles Manning 1179753ac610SCharles Manning if (existing_cunk == 0) 1180753ac610SCharles Manning in->n_data_chunks++; 1181753ac610SCharles Manning 1182753ac610SCharles Manning yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk); 1183753ac610SCharles Manning 1184753ac610SCharles Manning return YAFFS_OK; 1185753ac610SCharles Manning } 1186753ac610SCharles Manning 1187753ac610SCharles Manning static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk) 1188753ac610SCharles Manning { 1189753ac610SCharles Manning struct yaffs_block_info *the_block; 1190753ac610SCharles Manning unsigned block_no; 1191753ac610SCharles Manning 1192753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk); 1193753ac610SCharles Manning 1194753ac610SCharles Manning block_no = chunk / dev->param.chunks_per_block; 1195753ac610SCharles Manning the_block = yaffs_get_block_info(dev, block_no); 1196753ac610SCharles Manning if (the_block) { 1197753ac610SCharles Manning the_block->soft_del_pages++; 1198753ac610SCharles Manning dev->n_free_chunks++; 1199753ac610SCharles Manning yaffs2_update_oldest_dirty_seq(dev, block_no, the_block); 1200753ac610SCharles Manning } 1201753ac610SCharles Manning } 1202753ac610SCharles Manning 1203753ac610SCharles Manning /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all 1204753ac610SCharles Manning * the chunks in the file. 1205753ac610SCharles Manning * All soft deleting does is increment the block's softdelete count and pulls 1206753ac610SCharles Manning * the chunk out of the tnode. 1207753ac610SCharles Manning * Thus, essentially this is the same as DeleteWorker except that the chunks 1208753ac610SCharles Manning * are soft deleted. 1209753ac610SCharles Manning */ 1210753ac610SCharles Manning 1211753ac610SCharles Manning static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn, 1212753ac610SCharles Manning u32 level, int chunk_offset) 12130e8cc8bdSWilliam Juul { 12140e8cc8bdSWilliam Juul int i; 1215753ac610SCharles Manning int the_chunk; 1216753ac610SCharles Manning int all_done = 1; 1217753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev; 12180e8cc8bdSWilliam Juul 1219753ac610SCharles Manning if (!tn) 1220753ac610SCharles Manning return 1; 1221753ac610SCharles Manning 12220e8cc8bdSWilliam Juul if (level > 0) { 1223753ac610SCharles Manning for (i = YAFFS_NTNODES_INTERNAL - 1; 1224753ac610SCharles Manning all_done && i >= 0; 12250e8cc8bdSWilliam Juul i--) { 12260e8cc8bdSWilliam Juul if (tn->internal[i]) { 1227753ac610SCharles Manning all_done = 1228753ac610SCharles Manning yaffs_soft_del_worker(in, 1229753ac610SCharles Manning tn->internal[i], 12300e8cc8bdSWilliam Juul level - 1, 1231753ac610SCharles Manning (chunk_offset << 12320e8cc8bdSWilliam Juul YAFFS_TNODES_INTERNAL_BITS) 12330e8cc8bdSWilliam Juul + i); 1234753ac610SCharles Manning if (all_done) { 1235753ac610SCharles Manning yaffs_free_tnode(dev, 1236753ac610SCharles Manning tn->internal[i]); 12370e8cc8bdSWilliam Juul tn->internal[i] = NULL; 12380e8cc8bdSWilliam Juul } else { 1239753ac610SCharles Manning /* Can this happen? */ 12400e8cc8bdSWilliam Juul } 12410e8cc8bdSWilliam Juul } 12420e8cc8bdSWilliam Juul } 1243753ac610SCharles Manning return (all_done) ? 1 : 0; 1244753ac610SCharles Manning } 12450e8cc8bdSWilliam Juul 1246753ac610SCharles Manning /* level 0 */ 12470e8cc8bdSWilliam Juul for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) { 1248753ac610SCharles Manning the_chunk = yaffs_get_group_base(dev, tn, i); 1249753ac610SCharles Manning if (the_chunk) { 1250753ac610SCharles Manning yaffs_soft_del_chunk(dev, the_chunk); 1251753ac610SCharles Manning yaffs_load_tnode_0(dev, tn, i, 0); 12520e8cc8bdSWilliam Juul } 12530e8cc8bdSWilliam Juul } 12540e8cc8bdSWilliam Juul return 1; 12550e8cc8bdSWilliam Juul } 12560e8cc8bdSWilliam Juul 1257753ac610SCharles Manning static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj) 12580e8cc8bdSWilliam Juul { 1259753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev; 1260753ac610SCharles Manning struct yaffs_obj *parent; 1261753ac610SCharles Manning 1262753ac610SCharles Manning yaffs_verify_obj_in_dir(obj); 1263753ac610SCharles Manning parent = obj->parent; 1264753ac610SCharles Manning 1265753ac610SCharles Manning yaffs_verify_dir(parent); 1266753ac610SCharles Manning 1267753ac610SCharles Manning if (dev && dev->param.remove_obj_fn) 1268753ac610SCharles Manning dev->param.remove_obj_fn(obj); 1269753ac610SCharles Manning 1270753ac610SCharles Manning list_del_init(&obj->siblings); 1271753ac610SCharles Manning obj->parent = NULL; 1272753ac610SCharles Manning 1273753ac610SCharles Manning yaffs_verify_dir(parent); 12740e8cc8bdSWilliam Juul } 1275753ac610SCharles Manning 1276753ac610SCharles Manning void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj) 1277753ac610SCharles Manning { 1278753ac610SCharles Manning if (!directory) { 1279753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 1280753ac610SCharles Manning "tragedy: Trying to add an object to a null pointer directory" 1281753ac610SCharles Manning ); 1282753ac610SCharles Manning BUG(); 1283753ac610SCharles Manning return; 1284753ac610SCharles Manning } 1285753ac610SCharles Manning if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { 1286753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 1287753ac610SCharles Manning "tragedy: Trying to add an object to a non-directory" 1288753ac610SCharles Manning ); 1289753ac610SCharles Manning BUG(); 1290753ac610SCharles Manning } 1291753ac610SCharles Manning 1292753ac610SCharles Manning if (obj->siblings.prev == NULL) { 1293753ac610SCharles Manning /* Not initialised */ 1294753ac610SCharles Manning BUG(); 1295753ac610SCharles Manning } 1296753ac610SCharles Manning 1297753ac610SCharles Manning yaffs_verify_dir(directory); 1298753ac610SCharles Manning 1299753ac610SCharles Manning yaffs_remove_obj_from_dir(obj); 1300753ac610SCharles Manning 1301753ac610SCharles Manning /* Now add it */ 1302753ac610SCharles Manning list_add(&obj->siblings, &directory->variant.dir_variant.children); 1303753ac610SCharles Manning obj->parent = directory; 1304753ac610SCharles Manning 1305753ac610SCharles Manning if (directory == obj->my_dev->unlinked_dir 1306753ac610SCharles Manning || directory == obj->my_dev->del_dir) { 1307753ac610SCharles Manning obj->unlinked = 1; 1308753ac610SCharles Manning obj->my_dev->n_unlinked_files++; 1309753ac610SCharles Manning obj->rename_allowed = 0; 1310753ac610SCharles Manning } 1311753ac610SCharles Manning 1312753ac610SCharles Manning yaffs_verify_dir(directory); 1313753ac610SCharles Manning yaffs_verify_obj_in_dir(obj); 1314753ac610SCharles Manning } 1315753ac610SCharles Manning 1316753ac610SCharles Manning static int yaffs_change_obj_name(struct yaffs_obj *obj, 1317753ac610SCharles Manning struct yaffs_obj *new_dir, 1318753ac610SCharles Manning const YCHAR *new_name, int force, int shadows) 1319753ac610SCharles Manning { 1320753ac610SCharles Manning int unlink_op; 1321753ac610SCharles Manning int del_op; 1322753ac610SCharles Manning struct yaffs_obj *existing_target; 1323753ac610SCharles Manning 1324753ac610SCharles Manning if (new_dir == NULL) 1325753ac610SCharles Manning new_dir = obj->parent; /* use the old directory */ 1326753ac610SCharles Manning 1327753ac610SCharles Manning if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { 1328753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 1329753ac610SCharles Manning "tragedy: yaffs_change_obj_name: new_dir is not a directory" 1330753ac610SCharles Manning ); 1331753ac610SCharles Manning BUG(); 1332753ac610SCharles Manning } 1333753ac610SCharles Manning 1334753ac610SCharles Manning unlink_op = (new_dir == obj->my_dev->unlinked_dir); 1335753ac610SCharles Manning del_op = (new_dir == obj->my_dev->del_dir); 1336753ac610SCharles Manning 1337753ac610SCharles Manning existing_target = yaffs_find_by_name(new_dir, new_name); 1338753ac610SCharles Manning 1339753ac610SCharles Manning /* If the object is a file going into the unlinked directory, 1340753ac610SCharles Manning * then it is OK to just stuff it in since duplicate names are OK. 1341753ac610SCharles Manning * else only proceed if the new name does not exist and we're putting 1342753ac610SCharles Manning * it into a directory. 1343753ac610SCharles Manning */ 1344753ac610SCharles Manning if (!(unlink_op || del_op || force || 1345753ac610SCharles Manning shadows > 0 || !existing_target) || 1346753ac610SCharles Manning new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) 1347753ac610SCharles Manning return YAFFS_FAIL; 1348753ac610SCharles Manning 1349753ac610SCharles Manning yaffs_set_obj_name(obj, new_name); 1350753ac610SCharles Manning obj->dirty = 1; 1351753ac610SCharles Manning yaffs_add_obj_to_dir(new_dir, obj); 1352753ac610SCharles Manning 1353753ac610SCharles Manning if (unlink_op) 1354753ac610SCharles Manning obj->unlinked = 1; 1355753ac610SCharles Manning 1356753ac610SCharles Manning /* If it is a deletion then we mark it as a shrink for gc */ 1357753ac610SCharles Manning if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0) 1358753ac610SCharles Manning return YAFFS_OK; 1359753ac610SCharles Manning 1360753ac610SCharles Manning return YAFFS_FAIL; 1361753ac610SCharles Manning } 1362753ac610SCharles Manning 1363753ac610SCharles Manning /*------------------------ Short Operations Cache ------------------------------ 1364753ac610SCharles Manning * In many situations where there is no high level buffering a lot of 1365753ac610SCharles Manning * reads might be short sequential reads, and a lot of writes may be short 1366753ac610SCharles Manning * sequential writes. eg. scanning/writing a jpeg file. 1367753ac610SCharles Manning * In these cases, a short read/write cache can provide a huge perfomance 1368753ac610SCharles Manning * benefit with dumb-as-a-rock code. 1369753ac610SCharles Manning * In Linux, the page cache provides read buffering and the short op cache 1370753ac610SCharles Manning * provides write buffering. 1371753ac610SCharles Manning * 1372753ac610SCharles Manning * There are a small number (~10) of cache chunks per device so that we don't 1373753ac610SCharles Manning * need a very intelligent search. 1374753ac610SCharles Manning */ 1375753ac610SCharles Manning 1376753ac610SCharles Manning static int yaffs_obj_cache_dirty(struct yaffs_obj *obj) 1377753ac610SCharles Manning { 1378753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev; 1379753ac610SCharles Manning int i; 1380753ac610SCharles Manning struct yaffs_cache *cache; 1381753ac610SCharles Manning int n_caches = obj->my_dev->param.n_caches; 1382753ac610SCharles Manning 1383753ac610SCharles Manning for (i = 0; i < n_caches; i++) { 1384753ac610SCharles Manning cache = &dev->cache[i]; 1385753ac610SCharles Manning if (cache->object == obj && cache->dirty) 1386753ac610SCharles Manning return 1; 1387753ac610SCharles Manning } 1388753ac610SCharles Manning 1389753ac610SCharles Manning return 0; 1390753ac610SCharles Manning } 1391753ac610SCharles Manning 1392753ac610SCharles Manning static void yaffs_flush_file_cache(struct yaffs_obj *obj) 1393753ac610SCharles Manning { 1394753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev; 1395753ac610SCharles Manning int lowest = -99; /* Stop compiler whining. */ 1396753ac610SCharles Manning int i; 1397753ac610SCharles Manning struct yaffs_cache *cache; 1398753ac610SCharles Manning int chunk_written = 0; 1399753ac610SCharles Manning int n_caches = obj->my_dev->param.n_caches; 1400753ac610SCharles Manning 1401753ac610SCharles Manning if (n_caches < 1) 1402753ac610SCharles Manning return; 1403753ac610SCharles Manning do { 1404753ac610SCharles Manning cache = NULL; 1405753ac610SCharles Manning 1406753ac610SCharles Manning /* Find the lowest dirty chunk for this object */ 1407753ac610SCharles Manning for (i = 0; i < n_caches; i++) { 1408753ac610SCharles Manning if (dev->cache[i].object == obj && 1409753ac610SCharles Manning dev->cache[i].dirty) { 1410753ac610SCharles Manning if (!cache || 1411753ac610SCharles Manning dev->cache[i].chunk_id < lowest) { 1412753ac610SCharles Manning cache = &dev->cache[i]; 1413753ac610SCharles Manning lowest = cache->chunk_id; 1414753ac610SCharles Manning } 1415753ac610SCharles Manning } 1416753ac610SCharles Manning } 1417753ac610SCharles Manning 1418753ac610SCharles Manning if (cache && !cache->locked) { 1419753ac610SCharles Manning /* Write it out and free it up */ 1420753ac610SCharles Manning chunk_written = 1421753ac610SCharles Manning yaffs_wr_data_obj(cache->object, 1422753ac610SCharles Manning cache->chunk_id, 1423753ac610SCharles Manning cache->data, 1424753ac610SCharles Manning cache->n_bytes, 1); 1425753ac610SCharles Manning cache->dirty = 0; 1426753ac610SCharles Manning cache->object = NULL; 1427753ac610SCharles Manning } 1428753ac610SCharles Manning } while (cache && chunk_written > 0); 1429753ac610SCharles Manning 1430753ac610SCharles Manning if (cache) 1431753ac610SCharles Manning /* Hoosterman, disk full while writing cache out. */ 1432753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 1433753ac610SCharles Manning "yaffs tragedy: no space during cache write"); 1434753ac610SCharles Manning } 1435753ac610SCharles Manning 1436753ac610SCharles Manning /*yaffs_flush_whole_cache(dev) 1437753ac610SCharles Manning * 1438753ac610SCharles Manning * 1439753ac610SCharles Manning */ 1440753ac610SCharles Manning 1441753ac610SCharles Manning void yaffs_flush_whole_cache(struct yaffs_dev *dev) 1442753ac610SCharles Manning { 1443753ac610SCharles Manning struct yaffs_obj *obj; 1444753ac610SCharles Manning int n_caches = dev->param.n_caches; 1445753ac610SCharles Manning int i; 1446753ac610SCharles Manning 1447753ac610SCharles Manning /* Find a dirty object in the cache and flush it... 1448753ac610SCharles Manning * until there are no further dirty objects. 1449753ac610SCharles Manning */ 1450753ac610SCharles Manning do { 1451753ac610SCharles Manning obj = NULL; 1452753ac610SCharles Manning for (i = 0; i < n_caches && !obj; i++) { 1453753ac610SCharles Manning if (dev->cache[i].object && dev->cache[i].dirty) 1454753ac610SCharles Manning obj = dev->cache[i].object; 1455753ac610SCharles Manning } 1456753ac610SCharles Manning if (obj) 1457753ac610SCharles Manning yaffs_flush_file_cache(obj); 1458753ac610SCharles Manning } while (obj); 1459753ac610SCharles Manning 1460753ac610SCharles Manning } 1461753ac610SCharles Manning 1462753ac610SCharles Manning /* Grab us a cache chunk for use. 1463753ac610SCharles Manning * First look for an empty one. 1464753ac610SCharles Manning * Then look for the least recently used non-dirty one. 1465753ac610SCharles Manning * Then look for the least recently used dirty one...., flush and look again. 1466753ac610SCharles Manning */ 1467753ac610SCharles Manning static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev) 1468753ac610SCharles Manning { 1469753ac610SCharles Manning int i; 1470753ac610SCharles Manning 1471753ac610SCharles Manning if (dev->param.n_caches > 0) { 1472753ac610SCharles Manning for (i = 0; i < dev->param.n_caches; i++) { 1473753ac610SCharles Manning if (!dev->cache[i].object) 1474753ac610SCharles Manning return &dev->cache[i]; 1475753ac610SCharles Manning } 1476753ac610SCharles Manning } 1477753ac610SCharles Manning return NULL; 1478753ac610SCharles Manning } 1479753ac610SCharles Manning 1480753ac610SCharles Manning static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev) 1481753ac610SCharles Manning { 1482753ac610SCharles Manning struct yaffs_cache *cache; 1483753ac610SCharles Manning struct yaffs_obj *the_obj; 1484753ac610SCharles Manning int usage; 1485753ac610SCharles Manning int i; 1486753ac610SCharles Manning 1487753ac610SCharles Manning if (dev->param.n_caches < 1) 1488753ac610SCharles Manning return NULL; 1489753ac610SCharles Manning 1490753ac610SCharles Manning /* Try find a non-dirty one... */ 1491753ac610SCharles Manning 1492753ac610SCharles Manning cache = yaffs_grab_chunk_worker(dev); 1493753ac610SCharles Manning 1494753ac610SCharles Manning if (!cache) { 1495753ac610SCharles Manning /* They were all dirty, find the LRU object and flush 1496753ac610SCharles Manning * its cache, then find again. 1497753ac610SCharles Manning * NB what's here is not very accurate, 1498753ac610SCharles Manning * we actually flush the object with the LRU chunk. 1499753ac610SCharles Manning */ 1500753ac610SCharles Manning 1501753ac610SCharles Manning /* With locking we can't assume we can use entry zero, 1502753ac610SCharles Manning * Set the_obj to a valid pointer for Coverity. */ 1503753ac610SCharles Manning the_obj = dev->cache[0].object; 1504753ac610SCharles Manning usage = -1; 1505753ac610SCharles Manning cache = NULL; 1506753ac610SCharles Manning 1507753ac610SCharles Manning for (i = 0; i < dev->param.n_caches; i++) { 1508753ac610SCharles Manning if (dev->cache[i].object && 1509753ac610SCharles Manning !dev->cache[i].locked && 1510753ac610SCharles Manning (dev->cache[i].last_use < usage || 1511753ac610SCharles Manning !cache)) { 1512753ac610SCharles Manning usage = dev->cache[i].last_use; 1513753ac610SCharles Manning the_obj = dev->cache[i].object; 1514753ac610SCharles Manning cache = &dev->cache[i]; 1515753ac610SCharles Manning } 1516753ac610SCharles Manning } 1517753ac610SCharles Manning 1518753ac610SCharles Manning if (!cache || cache->dirty) { 1519753ac610SCharles Manning /* Flush and try again */ 1520753ac610SCharles Manning yaffs_flush_file_cache(the_obj); 1521753ac610SCharles Manning cache = yaffs_grab_chunk_worker(dev); 1522753ac610SCharles Manning } 1523753ac610SCharles Manning } 1524753ac610SCharles Manning return cache; 1525753ac610SCharles Manning } 1526753ac610SCharles Manning 1527753ac610SCharles Manning /* Find a cached chunk */ 1528753ac610SCharles Manning static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj, 1529753ac610SCharles Manning int chunk_id) 1530753ac610SCharles Manning { 1531753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev; 1532753ac610SCharles Manning int i; 1533753ac610SCharles Manning 1534753ac610SCharles Manning if (dev->param.n_caches < 1) 1535753ac610SCharles Manning return NULL; 1536753ac610SCharles Manning 1537753ac610SCharles Manning for (i = 0; i < dev->param.n_caches; i++) { 1538753ac610SCharles Manning if (dev->cache[i].object == obj && 1539753ac610SCharles Manning dev->cache[i].chunk_id == chunk_id) { 1540753ac610SCharles Manning dev->cache_hits++; 1541753ac610SCharles Manning 1542753ac610SCharles Manning return &dev->cache[i]; 1543753ac610SCharles Manning } 1544753ac610SCharles Manning } 1545753ac610SCharles Manning return NULL; 1546753ac610SCharles Manning } 1547753ac610SCharles Manning 1548753ac610SCharles Manning /* Mark the chunk for the least recently used algorithym */ 1549753ac610SCharles Manning static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache, 1550753ac610SCharles Manning int is_write) 1551753ac610SCharles Manning { 1552753ac610SCharles Manning int i; 1553753ac610SCharles Manning 1554753ac610SCharles Manning if (dev->param.n_caches < 1) 1555753ac610SCharles Manning return; 1556753ac610SCharles Manning 1557753ac610SCharles Manning if (dev->cache_last_use < 0 || 1558753ac610SCharles Manning dev->cache_last_use > 100000000) { 1559753ac610SCharles Manning /* Reset the cache usages */ 1560753ac610SCharles Manning for (i = 1; i < dev->param.n_caches; i++) 1561753ac610SCharles Manning dev->cache[i].last_use = 0; 1562753ac610SCharles Manning 1563753ac610SCharles Manning dev->cache_last_use = 0; 1564753ac610SCharles Manning } 1565753ac610SCharles Manning dev->cache_last_use++; 1566753ac610SCharles Manning cache->last_use = dev->cache_last_use; 1567753ac610SCharles Manning 1568753ac610SCharles Manning if (is_write) 1569753ac610SCharles Manning cache->dirty = 1; 1570753ac610SCharles Manning } 1571753ac610SCharles Manning 1572753ac610SCharles Manning /* Invalidate a single cache page. 1573753ac610SCharles Manning * Do this when a whole page gets written, 1574753ac610SCharles Manning * ie the short cache for this page is no longer valid. 1575753ac610SCharles Manning */ 1576753ac610SCharles Manning static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id) 1577753ac610SCharles Manning { 1578753ac610SCharles Manning struct yaffs_cache *cache; 1579753ac610SCharles Manning 1580753ac610SCharles Manning if (object->my_dev->param.n_caches > 0) { 1581753ac610SCharles Manning cache = yaffs_find_chunk_cache(object, chunk_id); 1582753ac610SCharles Manning 1583753ac610SCharles Manning if (cache) 1584753ac610SCharles Manning cache->object = NULL; 1585753ac610SCharles Manning } 1586753ac610SCharles Manning } 1587753ac610SCharles Manning 1588753ac610SCharles Manning /* Invalidate all the cache pages associated with this object 1589753ac610SCharles Manning * Do this whenever ther file is deleted or resized. 1590753ac610SCharles Manning */ 1591753ac610SCharles Manning static void yaffs_invalidate_whole_cache(struct yaffs_obj *in) 1592753ac610SCharles Manning { 1593753ac610SCharles Manning int i; 1594753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev; 1595753ac610SCharles Manning 1596753ac610SCharles Manning if (dev->param.n_caches > 0) { 1597753ac610SCharles Manning /* Invalidate it. */ 1598753ac610SCharles Manning for (i = 0; i < dev->param.n_caches; i++) { 1599753ac610SCharles Manning if (dev->cache[i].object == in) 1600753ac610SCharles Manning dev->cache[i].object = NULL; 1601753ac610SCharles Manning } 1602753ac610SCharles Manning } 1603753ac610SCharles Manning } 1604753ac610SCharles Manning 1605753ac610SCharles Manning static void yaffs_unhash_obj(struct yaffs_obj *obj) 1606753ac610SCharles Manning { 1607753ac610SCharles Manning int bucket; 1608753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev; 1609753ac610SCharles Manning 1610753ac610SCharles Manning /* If it is still linked into the bucket list, free from the list */ 1611753ac610SCharles Manning if (!list_empty(&obj->hash_link)) { 1612753ac610SCharles Manning list_del_init(&obj->hash_link); 1613753ac610SCharles Manning bucket = yaffs_hash_fn(obj->obj_id); 1614753ac610SCharles Manning dev->obj_bucket[bucket].count--; 1615753ac610SCharles Manning } 1616753ac610SCharles Manning } 1617753ac610SCharles Manning 1618753ac610SCharles Manning /* FreeObject frees up a Object and puts it back on the free list */ 1619753ac610SCharles Manning static void yaffs_free_obj(struct yaffs_obj *obj) 1620753ac610SCharles Manning { 1621753ac610SCharles Manning struct yaffs_dev *dev; 1622753ac610SCharles Manning 1623753ac610SCharles Manning if (!obj) { 1624753ac610SCharles Manning BUG(); 1625753ac610SCharles Manning return; 1626753ac610SCharles Manning } 1627753ac610SCharles Manning dev = obj->my_dev; 1628753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p", 1629753ac610SCharles Manning obj, obj->my_inode); 1630753ac610SCharles Manning if (obj->parent) 1631753ac610SCharles Manning BUG(); 1632753ac610SCharles Manning if (!list_empty(&obj->siblings)) 1633753ac610SCharles Manning BUG(); 1634753ac610SCharles Manning 1635753ac610SCharles Manning if (obj->my_inode) { 1636753ac610SCharles Manning /* We're still hooked up to a cached inode. 1637753ac610SCharles Manning * Don't delete now, but mark for later deletion 1638753ac610SCharles Manning */ 1639753ac610SCharles Manning obj->defered_free = 1; 1640753ac610SCharles Manning return; 1641753ac610SCharles Manning } 1642753ac610SCharles Manning 1643753ac610SCharles Manning yaffs_unhash_obj(obj); 1644753ac610SCharles Manning 1645753ac610SCharles Manning yaffs_free_raw_obj(dev, obj); 1646753ac610SCharles Manning dev->n_obj--; 1647753ac610SCharles Manning dev->checkpoint_blocks_required = 0; /* force recalculation */ 1648753ac610SCharles Manning } 1649753ac610SCharles Manning 1650753ac610SCharles Manning void yaffs_handle_defered_free(struct yaffs_obj *obj) 1651753ac610SCharles Manning { 1652753ac610SCharles Manning if (obj->defered_free) 1653753ac610SCharles Manning yaffs_free_obj(obj); 1654753ac610SCharles Manning } 1655753ac610SCharles Manning 1656753ac610SCharles Manning static int yaffs_generic_obj_del(struct yaffs_obj *in) 1657753ac610SCharles Manning { 1658753ac610SCharles Manning /* Iinvalidate the file's data in the cache, without flushing. */ 1659753ac610SCharles Manning yaffs_invalidate_whole_cache(in); 1660753ac610SCharles Manning 1661753ac610SCharles Manning if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) { 1662753ac610SCharles Manning /* Move to unlinked directory so we have a deletion record */ 1663753ac610SCharles Manning yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0, 1664753ac610SCharles Manning 0); 1665753ac610SCharles Manning } 1666753ac610SCharles Manning 1667753ac610SCharles Manning yaffs_remove_obj_from_dir(in); 1668753ac610SCharles Manning yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__); 1669753ac610SCharles Manning in->hdr_chunk = 0; 1670753ac610SCharles Manning 1671753ac610SCharles Manning yaffs_free_obj(in); 1672753ac610SCharles Manning return YAFFS_OK; 1673753ac610SCharles Manning 1674753ac610SCharles Manning } 1675753ac610SCharles Manning 1676753ac610SCharles Manning static void yaffs_soft_del_file(struct yaffs_obj *obj) 1677753ac610SCharles Manning { 1678753ac610SCharles Manning if (!obj->deleted || 1679753ac610SCharles Manning obj->variant_type != YAFFS_OBJECT_TYPE_FILE || 1680753ac610SCharles Manning obj->soft_del) 1681753ac610SCharles Manning return; 1682753ac610SCharles Manning 1683753ac610SCharles Manning if (obj->n_data_chunks <= 0) { 1684753ac610SCharles Manning /* Empty file with no duplicate object headers, 1685753ac610SCharles Manning * just delete it immediately */ 1686753ac610SCharles Manning yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top); 1687753ac610SCharles Manning obj->variant.file_variant.top = NULL; 1688753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING, 1689753ac610SCharles Manning "yaffs: Deleting empty file %d", 1690753ac610SCharles Manning obj->obj_id); 1691753ac610SCharles Manning yaffs_generic_obj_del(obj); 1692753ac610SCharles Manning } else { 1693753ac610SCharles Manning yaffs_soft_del_worker(obj, 1694753ac610SCharles Manning obj->variant.file_variant.top, 1695753ac610SCharles Manning obj->variant. 1696753ac610SCharles Manning file_variant.top_level, 0); 1697753ac610SCharles Manning obj->soft_del = 1; 16980e8cc8bdSWilliam Juul } 16990e8cc8bdSWilliam Juul } 17000e8cc8bdSWilliam Juul 17010e8cc8bdSWilliam Juul /* Pruning removes any part of the file structure tree that is beyond the 17020e8cc8bdSWilliam Juul * bounds of the file (ie that does not point to chunks). 17030e8cc8bdSWilliam Juul * 17040e8cc8bdSWilliam Juul * A file should only get pruned when its size is reduced. 17050e8cc8bdSWilliam Juul * 17060e8cc8bdSWilliam Juul * Before pruning, the chunks must be pulled from the tree and the 17070e8cc8bdSWilliam Juul * level 0 tnode entries must be zeroed out. 17080e8cc8bdSWilliam Juul * Could also use this for file deletion, but that's probably better handled 17090e8cc8bdSWilliam Juul * by a special case. 1710753ac610SCharles Manning * 1711753ac610SCharles Manning * This function is recursive. For levels > 0 the function is called again on 1712753ac610SCharles Manning * any sub-tree. For level == 0 we just check if the sub-tree has data. 1713753ac610SCharles Manning * If there is no data in a subtree then it is pruned. 17140e8cc8bdSWilliam Juul */ 17150e8cc8bdSWilliam Juul 1716753ac610SCharles Manning static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev, 1717753ac610SCharles Manning struct yaffs_tnode *tn, u32 level, 1718753ac610SCharles Manning int del0) 17190e8cc8bdSWilliam Juul { 17200e8cc8bdSWilliam Juul int i; 1721753ac610SCharles Manning int has_data; 17220e8cc8bdSWilliam Juul 1723753ac610SCharles Manning if (!tn) 1724753ac610SCharles Manning return tn; 17250e8cc8bdSWilliam Juul 1726753ac610SCharles Manning has_data = 0; 1727753ac610SCharles Manning 1728753ac610SCharles Manning if (level > 0) { 17290e8cc8bdSWilliam Juul for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) { 1730753ac610SCharles Manning if (tn->internal[i]) { 17310e8cc8bdSWilliam Juul tn->internal[i] = 1732753ac610SCharles Manning yaffs_prune_worker(dev, 1733753ac610SCharles Manning tn->internal[i], 17340e8cc8bdSWilliam Juul level - 1, 17350e8cc8bdSWilliam Juul (i == 0) ? del0 : 1); 17360e8cc8bdSWilliam Juul } 17370e8cc8bdSWilliam Juul 1738753ac610SCharles Manning if (tn->internal[i]) 1739753ac610SCharles Manning has_data++; 1740753ac610SCharles Manning } 1741753ac610SCharles Manning } else { 1742753ac610SCharles Manning int tnode_size_u32 = dev->tnode_size / sizeof(u32); 1743753ac610SCharles Manning u32 *map = (u32 *) tn; 1744753ac610SCharles Manning 1745753ac610SCharles Manning for (i = 0; !has_data && i < tnode_size_u32; i++) { 1746753ac610SCharles Manning if (map[i]) 1747753ac610SCharles Manning has_data++; 17480e8cc8bdSWilliam Juul } 17490e8cc8bdSWilliam Juul } 17500e8cc8bdSWilliam Juul 1751753ac610SCharles Manning if (has_data == 0 && del0) { 17520e8cc8bdSWilliam Juul /* Free and return NULL */ 1753753ac610SCharles Manning yaffs_free_tnode(dev, tn); 17540e8cc8bdSWilliam Juul tn = NULL; 17550e8cc8bdSWilliam Juul } 17560e8cc8bdSWilliam Juul return tn; 17570e8cc8bdSWilliam Juul } 17580e8cc8bdSWilliam Juul 1759753ac610SCharles Manning static int yaffs_prune_tree(struct yaffs_dev *dev, 1760753ac610SCharles Manning struct yaffs_file_var *file_struct) 17610e8cc8bdSWilliam Juul { 17620e8cc8bdSWilliam Juul int i; 1763753ac610SCharles Manning int has_data; 17640e8cc8bdSWilliam Juul int done = 0; 1765753ac610SCharles Manning struct yaffs_tnode *tn; 17660e8cc8bdSWilliam Juul 1767753ac610SCharles Manning if (file_struct->top_level < 1) 1768753ac610SCharles Manning return YAFFS_OK; 17690e8cc8bdSWilliam Juul 1770753ac610SCharles Manning file_struct->top = 1771753ac610SCharles Manning yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0); 1772753ac610SCharles Manning 1773753ac610SCharles Manning /* Now we have a tree with all the non-zero branches NULL but 1774753ac610SCharles Manning * the height is the same as it was. 17750e8cc8bdSWilliam Juul * Let's see if we can trim internal tnodes to shorten the tree. 17760e8cc8bdSWilliam Juul * We can do this if only the 0th element in the tnode is in use 17770e8cc8bdSWilliam Juul * (ie all the non-zero are NULL) 17780e8cc8bdSWilliam Juul */ 17790e8cc8bdSWilliam Juul 1780753ac610SCharles Manning while (file_struct->top_level && !done) { 1781753ac610SCharles Manning tn = file_struct->top; 17820e8cc8bdSWilliam Juul 1783753ac610SCharles Manning has_data = 0; 17840e8cc8bdSWilliam Juul for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) { 1785753ac610SCharles Manning if (tn->internal[i]) 1786753ac610SCharles Manning has_data++; 17870e8cc8bdSWilliam Juul } 17880e8cc8bdSWilliam Juul 1789753ac610SCharles Manning if (!has_data) { 1790753ac610SCharles Manning file_struct->top = tn->internal[0]; 1791753ac610SCharles Manning file_struct->top_level--; 1792753ac610SCharles Manning yaffs_free_tnode(dev, tn); 17930e8cc8bdSWilliam Juul } else { 17940e8cc8bdSWilliam Juul done = 1; 17950e8cc8bdSWilliam Juul } 17960e8cc8bdSWilliam Juul } 17970e8cc8bdSWilliam Juul 17980e8cc8bdSWilliam Juul return YAFFS_OK; 17990e8cc8bdSWilliam Juul } 18000e8cc8bdSWilliam Juul 18010e8cc8bdSWilliam Juul /*-------------------- End of File Structure functions.-------------------*/ 18020e8cc8bdSWilliam Juul 1803753ac610SCharles Manning /* alloc_empty_obj gets us a clean Object.*/ 1804753ac610SCharles Manning static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev) 18050e8cc8bdSWilliam Juul { 1806753ac610SCharles Manning struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev); 18070e8cc8bdSWilliam Juul 1808753ac610SCharles Manning if (!obj) 1809753ac610SCharles Manning return obj; 18100e8cc8bdSWilliam Juul 1811753ac610SCharles Manning dev->n_obj++; 18120e8cc8bdSWilliam Juul 18130e8cc8bdSWilliam Juul /* Now sweeten it up... */ 18140e8cc8bdSWilliam Juul 1815753ac610SCharles Manning memset(obj, 0, sizeof(struct yaffs_obj)); 1816753ac610SCharles Manning obj->being_created = 1; 1817753ac610SCharles Manning 1818753ac610SCharles Manning obj->my_dev = dev; 1819753ac610SCharles Manning obj->hdr_chunk = 0; 1820753ac610SCharles Manning obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN; 1821753ac610SCharles Manning INIT_LIST_HEAD(&(obj->hard_links)); 1822753ac610SCharles Manning INIT_LIST_HEAD(&(obj->hash_link)); 1823753ac610SCharles Manning INIT_LIST_HEAD(&obj->siblings); 1824753ac610SCharles Manning 1825753ac610SCharles Manning /* Now make the directory sane */ 1826753ac610SCharles Manning if (dev->root_dir) { 1827753ac610SCharles Manning obj->parent = dev->root_dir; 1828753ac610SCharles Manning list_add(&(obj->siblings), 1829753ac610SCharles Manning &dev->root_dir->variant.dir_variant.children); 1830753ac610SCharles Manning } 18310e8cc8bdSWilliam Juul 18320e8cc8bdSWilliam Juul /* Add it to the lost and found directory. 1833753ac610SCharles Manning * NB Can't put root or lost-n-found in lost-n-found so 1834753ac610SCharles Manning * check if lost-n-found exists first 18350e8cc8bdSWilliam Juul */ 1836753ac610SCharles Manning if (dev->lost_n_found) 1837753ac610SCharles Manning yaffs_add_obj_to_dir(dev->lost_n_found, obj); 18380e8cc8bdSWilliam Juul 1839753ac610SCharles Manning obj->being_created = 0; 18400e8cc8bdSWilliam Juul 1841753ac610SCharles Manning dev->checkpoint_blocks_required = 0; /* force recalculation */ 18420e8cc8bdSWilliam Juul 18430e8cc8bdSWilliam Juul return obj; 18440e8cc8bdSWilliam Juul } 18450e8cc8bdSWilliam Juul 1846753ac610SCharles Manning static int yaffs_find_nice_bucket(struct yaffs_dev *dev) 18470e8cc8bdSWilliam Juul { 18480e8cc8bdSWilliam Juul int i; 18490e8cc8bdSWilliam Juul int l = 999; 18500e8cc8bdSWilliam Juul int lowest = 999999; 18510e8cc8bdSWilliam Juul 1852753ac610SCharles Manning /* Search for the shortest list or one that 1853753ac610SCharles Manning * isn't too long. 18540e8cc8bdSWilliam Juul */ 18550e8cc8bdSWilliam Juul 1856753ac610SCharles Manning for (i = 0; i < 10 && lowest > 4; i++) { 1857753ac610SCharles Manning dev->bucket_finder++; 1858753ac610SCharles Manning dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS; 1859753ac610SCharles Manning if (dev->obj_bucket[dev->bucket_finder].count < lowest) { 1860753ac610SCharles Manning lowest = dev->obj_bucket[dev->bucket_finder].count; 1861753ac610SCharles Manning l = dev->bucket_finder; 18620e8cc8bdSWilliam Juul } 18630e8cc8bdSWilliam Juul } 18640e8cc8bdSWilliam Juul 18650e8cc8bdSWilliam Juul return l; 18660e8cc8bdSWilliam Juul } 18670e8cc8bdSWilliam Juul 1868753ac610SCharles Manning static int yaffs_new_obj_id(struct yaffs_dev *dev) 18690e8cc8bdSWilliam Juul { 1870753ac610SCharles Manning int bucket = yaffs_find_nice_bucket(dev); 1871753ac610SCharles Manning int found = 0; 1872753ac610SCharles Manning struct list_head *i; 1873753ac610SCharles Manning u32 n = (u32) bucket; 18740e8cc8bdSWilliam Juul 18750e8cc8bdSWilliam Juul /* Now find an object value that has not already been taken 18760e8cc8bdSWilliam Juul * by scanning the list. 18770e8cc8bdSWilliam Juul */ 18780e8cc8bdSWilliam Juul 18790e8cc8bdSWilliam Juul while (!found) { 18800e8cc8bdSWilliam Juul found = 1; 18810e8cc8bdSWilliam Juul n += YAFFS_NOBJECT_BUCKETS; 1882753ac610SCharles Manning if (1 || dev->obj_bucket[bucket].count > 0) { 1883753ac610SCharles Manning list_for_each(i, &dev->obj_bucket[bucket].list) { 18840e8cc8bdSWilliam Juul /* If there is already one in the list */ 1885753ac610SCharles Manning if (i && list_entry(i, struct yaffs_obj, 1886753ac610SCharles Manning hash_link)->obj_id == n) { 18870e8cc8bdSWilliam Juul found = 0; 18880e8cc8bdSWilliam Juul } 18890e8cc8bdSWilliam Juul } 18900e8cc8bdSWilliam Juul } 18910e8cc8bdSWilliam Juul } 18920e8cc8bdSWilliam Juul return n; 18930e8cc8bdSWilliam Juul } 18940e8cc8bdSWilliam Juul 1895753ac610SCharles Manning static void yaffs_hash_obj(struct yaffs_obj *in) 18960e8cc8bdSWilliam Juul { 1897753ac610SCharles Manning int bucket = yaffs_hash_fn(in->obj_id); 1898753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev; 18990e8cc8bdSWilliam Juul 1900753ac610SCharles Manning list_add(&in->hash_link, &dev->obj_bucket[bucket].list); 1901753ac610SCharles Manning dev->obj_bucket[bucket].count++; 19020e8cc8bdSWilliam Juul } 19030e8cc8bdSWilliam Juul 1904753ac610SCharles Manning struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number) 19050e8cc8bdSWilliam Juul { 1906753ac610SCharles Manning int bucket = yaffs_hash_fn(number); 19070e8cc8bdSWilliam Juul struct list_head *i; 1908753ac610SCharles Manning struct yaffs_obj *in; 19090e8cc8bdSWilliam Juul 1910753ac610SCharles Manning list_for_each(i, &dev->obj_bucket[bucket].list) { 19110e8cc8bdSWilliam Juul /* Look if it is in the list */ 1912753ac610SCharles Manning in = list_entry(i, struct yaffs_obj, hash_link); 1913753ac610SCharles Manning if (in->obj_id == number) { 1914753ac610SCharles Manning /* Don't show if it is defered free */ 1915753ac610SCharles Manning if (in->defered_free) 19160e8cc8bdSWilliam Juul return NULL; 19170e8cc8bdSWilliam Juul return in; 19180e8cc8bdSWilliam Juul } 19190e8cc8bdSWilliam Juul } 19200e8cc8bdSWilliam Juul 19210e8cc8bdSWilliam Juul return NULL; 19220e8cc8bdSWilliam Juul } 19230e8cc8bdSWilliam Juul 1924753ac610SCharles Manning struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number, 1925753ac610SCharles Manning enum yaffs_obj_type type) 19260e8cc8bdSWilliam Juul { 1927753ac610SCharles Manning struct yaffs_obj *the_obj = NULL; 1928753ac610SCharles Manning struct yaffs_tnode *tn = NULL; 19290e8cc8bdSWilliam Juul 1930753ac610SCharles Manning if (number < 0) 1931753ac610SCharles Manning number = yaffs_new_obj_id(dev); 19320e8cc8bdSWilliam Juul 19330e8cc8bdSWilliam Juul if (type == YAFFS_OBJECT_TYPE_FILE) { 1934753ac610SCharles Manning tn = yaffs_get_tnode(dev); 1935753ac610SCharles Manning if (!tn) 19360e8cc8bdSWilliam Juul return NULL; 19370e8cc8bdSWilliam Juul } 1938753ac610SCharles Manning 1939753ac610SCharles Manning the_obj = yaffs_alloc_empty_obj(dev); 1940753ac610SCharles Manning if (!the_obj) { 1941753ac610SCharles Manning if (tn) 1942753ac610SCharles Manning yaffs_free_tnode(dev, tn); 1943753ac610SCharles Manning return NULL; 19440e8cc8bdSWilliam Juul } 19450e8cc8bdSWilliam Juul 1946753ac610SCharles Manning the_obj->fake = 0; 1947753ac610SCharles Manning the_obj->rename_allowed = 1; 1948753ac610SCharles Manning the_obj->unlink_allowed = 1; 1949753ac610SCharles Manning the_obj->obj_id = number; 1950753ac610SCharles Manning yaffs_hash_obj(the_obj); 1951753ac610SCharles Manning the_obj->variant_type = type; 1952753ac610SCharles Manning yaffs_load_current_time(the_obj, 1, 1); 19530e8cc8bdSWilliam Juul 19540e8cc8bdSWilliam Juul switch (type) { 19550e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_FILE: 1956753ac610SCharles Manning the_obj->variant.file_variant.file_size = 0; 1957753ac610SCharles Manning the_obj->variant.file_variant.scanned_size = 0; 1958753ac610SCharles Manning the_obj->variant.file_variant.shrink_size = 1959753ac610SCharles Manning yaffs_max_file_size(dev); 1960753ac610SCharles Manning the_obj->variant.file_variant.top_level = 0; 1961753ac610SCharles Manning the_obj->variant.file_variant.top = tn; 19620e8cc8bdSWilliam Juul break; 19630e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_DIRECTORY: 1964753ac610SCharles Manning INIT_LIST_HEAD(&the_obj->variant.dir_variant.children); 1965753ac610SCharles Manning INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty); 19660e8cc8bdSWilliam Juul break; 19670e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SYMLINK: 19680e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_HARDLINK: 19690e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SPECIAL: 19700e8cc8bdSWilliam Juul /* No action required */ 19710e8cc8bdSWilliam Juul break; 19720e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_UNKNOWN: 19730e8cc8bdSWilliam Juul /* todo this should not happen */ 19740e8cc8bdSWilliam Juul break; 19750e8cc8bdSWilliam Juul } 1976753ac610SCharles Manning return the_obj; 19770e8cc8bdSWilliam Juul } 19780e8cc8bdSWilliam Juul 1979753ac610SCharles Manning static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev, 1980753ac610SCharles Manning int number, u32 mode) 1981753ac610SCharles Manning { 1982753ac610SCharles Manning 1983753ac610SCharles Manning struct yaffs_obj *obj = 1984753ac610SCharles Manning yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY); 1985753ac610SCharles Manning 1986753ac610SCharles Manning if (!obj) 1987753ac610SCharles Manning return NULL; 1988753ac610SCharles Manning 1989753ac610SCharles Manning obj->fake = 1; /* it is fake so it might not use NAND */ 1990753ac610SCharles Manning obj->rename_allowed = 0; 1991753ac610SCharles Manning obj->unlink_allowed = 0; 1992753ac610SCharles Manning obj->deleted = 0; 1993753ac610SCharles Manning obj->unlinked = 0; 1994753ac610SCharles Manning obj->yst_mode = mode; 1995753ac610SCharles Manning obj->my_dev = dev; 1996753ac610SCharles Manning obj->hdr_chunk = 0; /* Not a valid chunk. */ 1997753ac610SCharles Manning return obj; 1998753ac610SCharles Manning 19990e8cc8bdSWilliam Juul } 20000e8cc8bdSWilliam Juul 2001753ac610SCharles Manning 2002753ac610SCharles Manning static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev) 2003753ac610SCharles Manning { 2004753ac610SCharles Manning int i; 2005753ac610SCharles Manning 2006753ac610SCharles Manning dev->n_obj = 0; 2007753ac610SCharles Manning dev->n_tnodes = 0; 2008753ac610SCharles Manning yaffs_init_raw_tnodes_and_objs(dev); 2009753ac610SCharles Manning 2010753ac610SCharles Manning for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { 2011753ac610SCharles Manning INIT_LIST_HEAD(&dev->obj_bucket[i].list); 2012753ac610SCharles Manning dev->obj_bucket[i].count = 0; 2013753ac610SCharles Manning } 2014753ac610SCharles Manning } 2015753ac610SCharles Manning 2016753ac610SCharles Manning struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev, 20170e8cc8bdSWilliam Juul int number, 2018753ac610SCharles Manning enum yaffs_obj_type type) 20190e8cc8bdSWilliam Juul { 2020753ac610SCharles Manning struct yaffs_obj *the_obj = NULL; 20210e8cc8bdSWilliam Juul 2022753ac610SCharles Manning if (number > 0) 2023753ac610SCharles Manning the_obj = yaffs_find_by_number(dev, number); 20240e8cc8bdSWilliam Juul 2025753ac610SCharles Manning if (!the_obj) 2026753ac610SCharles Manning the_obj = yaffs_new_obj(dev, number, type); 20270e8cc8bdSWilliam Juul 2028753ac610SCharles Manning return the_obj; 20290e8cc8bdSWilliam Juul 20300e8cc8bdSWilliam Juul } 20310e8cc8bdSWilliam Juul 2032753ac610SCharles Manning YCHAR *yaffs_clone_str(const YCHAR *str) 20330e8cc8bdSWilliam Juul { 2034753ac610SCharles Manning YCHAR *new_str = NULL; 2035753ac610SCharles Manning int len; 20360e8cc8bdSWilliam Juul 2037753ac610SCharles Manning if (!str) 2038753ac610SCharles Manning str = _Y(""); 2039753ac610SCharles Manning 2040753ac610SCharles Manning len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH); 2041753ac610SCharles Manning new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS); 2042753ac610SCharles Manning if (new_str) { 2043753ac610SCharles Manning yaffs_strncpy(new_str, str, len); 2044753ac610SCharles Manning new_str[len] = 0; 2045753ac610SCharles Manning } 2046753ac610SCharles Manning return new_str; 2047753ac610SCharles Manning 2048753ac610SCharles Manning } 2049753ac610SCharles Manning /* 2050753ac610SCharles Manning *yaffs_update_parent() handles fixing a directories mtime and ctime when a new 2051753ac610SCharles Manning * link (ie. name) is created or deleted in the directory. 2052753ac610SCharles Manning * 2053753ac610SCharles Manning * ie. 2054753ac610SCharles Manning * create dir/a : update dir's mtime/ctime 2055753ac610SCharles Manning * rm dir/a: update dir's mtime/ctime 2056753ac610SCharles Manning * modify dir/a: don't update dir's mtimme/ctime 2057753ac610SCharles Manning * 2058753ac610SCharles Manning * This can be handled immediately or defered. Defering helps reduce the number 2059753ac610SCharles Manning * of updates when many files in a directory are changed within a brief period. 2060753ac610SCharles Manning * 2061753ac610SCharles Manning * If the directory updating is defered then yaffs_update_dirty_dirs must be 2062753ac610SCharles Manning * called periodically. 2063753ac610SCharles Manning */ 2064753ac610SCharles Manning 2065753ac610SCharles Manning static void yaffs_update_parent(struct yaffs_obj *obj) 2066753ac610SCharles Manning { 2067753ac610SCharles Manning struct yaffs_dev *dev; 2068753ac610SCharles Manning 2069753ac610SCharles Manning if (!obj) 2070753ac610SCharles Manning return; 2071753ac610SCharles Manning dev = obj->my_dev; 2072753ac610SCharles Manning obj->dirty = 1; 2073753ac610SCharles Manning yaffs_load_current_time(obj, 0, 1); 2074753ac610SCharles Manning if (dev->param.defered_dir_update) { 2075753ac610SCharles Manning struct list_head *link = &obj->variant.dir_variant.dirty; 2076753ac610SCharles Manning 2077753ac610SCharles Manning if (list_empty(link)) { 2078753ac610SCharles Manning list_add(link, &dev->dirty_dirs); 2079753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_BACKGROUND, 2080753ac610SCharles Manning "Added object %d to dirty directories", 2081753ac610SCharles Manning obj->obj_id); 20820e8cc8bdSWilliam Juul } 20830e8cc8bdSWilliam Juul 2084753ac610SCharles Manning } else { 2085753ac610SCharles Manning yaffs_update_oh(obj, NULL, 0, 0, 0, NULL); 2086753ac610SCharles Manning } 2087753ac610SCharles Manning } 20880e8cc8bdSWilliam Juul 2089753ac610SCharles Manning void yaffs_update_dirty_dirs(struct yaffs_dev *dev) 2090753ac610SCharles Manning { 2091753ac610SCharles Manning struct list_head *link; 2092753ac610SCharles Manning struct yaffs_obj *obj; 2093753ac610SCharles Manning struct yaffs_dir_var *d_s; 2094753ac610SCharles Manning union yaffs_obj_var *o_v; 2095753ac610SCharles Manning 2096753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories"); 2097753ac610SCharles Manning 2098753ac610SCharles Manning while (!list_empty(&dev->dirty_dirs)) { 2099753ac610SCharles Manning link = dev->dirty_dirs.next; 2100753ac610SCharles Manning list_del_init(link); 2101753ac610SCharles Manning 2102753ac610SCharles Manning d_s = list_entry(link, struct yaffs_dir_var, dirty); 2103753ac610SCharles Manning o_v = list_entry(d_s, union yaffs_obj_var, dir_variant); 2104753ac610SCharles Manning obj = list_entry(o_v, struct yaffs_obj, variant); 2105753ac610SCharles Manning 2106753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d", 2107753ac610SCharles Manning obj->obj_id); 2108753ac610SCharles Manning 2109753ac610SCharles Manning if (obj->dirty) 2110753ac610SCharles Manning yaffs_update_oh(obj, NULL, 0, 0, 0, NULL); 2111753ac610SCharles Manning } 21120e8cc8bdSWilliam Juul } 21130e8cc8bdSWilliam Juul 21140e8cc8bdSWilliam Juul /* 21150e8cc8bdSWilliam Juul * Mknod (create) a new object. 2116753ac610SCharles Manning * equiv_obj only has meaning for a hard link; 2117753ac610SCharles Manning * alias_str only has meaning for a symlink. 21180e8cc8bdSWilliam Juul * rdev only has meaning for devices (a subset of special objects) 21190e8cc8bdSWilliam Juul */ 21200e8cc8bdSWilliam Juul 2121753ac610SCharles Manning static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type, 2122753ac610SCharles Manning struct yaffs_obj *parent, 21230e8cc8bdSWilliam Juul const YCHAR *name, 2124753ac610SCharles Manning u32 mode, 2125753ac610SCharles Manning u32 uid, 2126753ac610SCharles Manning u32 gid, 2127753ac610SCharles Manning struct yaffs_obj *equiv_obj, 2128753ac610SCharles Manning const YCHAR *alias_str, u32 rdev) 21290e8cc8bdSWilliam Juul { 2130753ac610SCharles Manning struct yaffs_obj *in; 2131068d6f9aSWolfgang Denk YCHAR *str = NULL; 2132753ac610SCharles Manning struct yaffs_dev *dev = parent->my_dev; 21330e8cc8bdSWilliam Juul 2134753ac610SCharles Manning /* Check if the entry exists. 2135753ac610SCharles Manning * If it does then fail the call since we don't want a dup. */ 2136753ac610SCharles Manning if (yaffs_find_by_name(parent, name)) 21370e8cc8bdSWilliam Juul return NULL; 21380e8cc8bdSWilliam Juul 21390e8cc8bdSWilliam Juul if (type == YAFFS_OBJECT_TYPE_SYMLINK) { 2140753ac610SCharles Manning str = yaffs_clone_str(alias_str); 2141753ac610SCharles Manning if (!str) 21420e8cc8bdSWilliam Juul return NULL; 21430e8cc8bdSWilliam Juul } 2144753ac610SCharles Manning 2145753ac610SCharles Manning in = yaffs_new_obj(dev, -1, type); 2146753ac610SCharles Manning 2147753ac610SCharles Manning if (!in) { 2148753ac610SCharles Manning kfree(str); 2149753ac610SCharles Manning return NULL; 21500e8cc8bdSWilliam Juul } 21510e8cc8bdSWilliam Juul 2152753ac610SCharles Manning in->hdr_chunk = 0; 21530e8cc8bdSWilliam Juul in->valid = 1; 2154753ac610SCharles Manning in->variant_type = type; 21550e8cc8bdSWilliam Juul 21560e8cc8bdSWilliam Juul in->yst_mode = mode; 21570e8cc8bdSWilliam Juul 2158753ac610SCharles Manning yaffs_attribs_init(in, gid, uid, rdev); 21590e8cc8bdSWilliam Juul 2160753ac610SCharles Manning in->n_data_chunks = 0; 21610e8cc8bdSWilliam Juul 2162753ac610SCharles Manning yaffs_set_obj_name(in, name); 21630e8cc8bdSWilliam Juul in->dirty = 1; 21640e8cc8bdSWilliam Juul 2165753ac610SCharles Manning yaffs_add_obj_to_dir(parent, in); 21660e8cc8bdSWilliam Juul 2167753ac610SCharles Manning in->my_dev = parent->my_dev; 21680e8cc8bdSWilliam Juul 21690e8cc8bdSWilliam Juul switch (type) { 21700e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SYMLINK: 2171753ac610SCharles Manning in->variant.symlink_variant.alias = str; 21720e8cc8bdSWilliam Juul break; 21730e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_HARDLINK: 2174753ac610SCharles Manning in->variant.hardlink_variant.equiv_obj = equiv_obj; 2175753ac610SCharles Manning in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id; 2176753ac610SCharles Manning list_add(&in->hard_links, &equiv_obj->hard_links); 21770e8cc8bdSWilliam Juul break; 21780e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_FILE: 21790e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_DIRECTORY: 21800e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SPECIAL: 21810e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_UNKNOWN: 21820e8cc8bdSWilliam Juul /* do nothing */ 21830e8cc8bdSWilliam Juul break; 21840e8cc8bdSWilliam Juul } 21850e8cc8bdSWilliam Juul 2186753ac610SCharles Manning if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) { 2187753ac610SCharles Manning /* Could not create the object header, fail */ 2188753ac610SCharles Manning yaffs_del_obj(in); 21890e8cc8bdSWilliam Juul in = NULL; 21900e8cc8bdSWilliam Juul } 21910e8cc8bdSWilliam Juul 2192753ac610SCharles Manning if (in) 2193753ac610SCharles Manning yaffs_update_parent(parent); 21940e8cc8bdSWilliam Juul 21950e8cc8bdSWilliam Juul return in; 21960e8cc8bdSWilliam Juul } 21970e8cc8bdSWilliam Juul 2198753ac610SCharles Manning struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent, 2199753ac610SCharles Manning const YCHAR *name, u32 mode, u32 uid, 2200753ac610SCharles Manning u32 gid) 22010e8cc8bdSWilliam Juul { 2202753ac610SCharles Manning return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode, 22030e8cc8bdSWilliam Juul uid, gid, NULL, NULL, 0); 22040e8cc8bdSWilliam Juul } 22050e8cc8bdSWilliam Juul 2206753ac610SCharles Manning struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name, 2207753ac610SCharles Manning u32 mode, u32 uid, u32 gid) 22080e8cc8bdSWilliam Juul { 2209753ac610SCharles Manning return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name, 22100e8cc8bdSWilliam Juul mode, uid, gid, NULL, NULL, 0); 22110e8cc8bdSWilliam Juul } 22120e8cc8bdSWilliam Juul 2213753ac610SCharles Manning struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent, 2214753ac610SCharles Manning const YCHAR *name, u32 mode, u32 uid, 2215753ac610SCharles Manning u32 gid, u32 rdev) 22160e8cc8bdSWilliam Juul { 2217753ac610SCharles Manning return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode, 22180e8cc8bdSWilliam Juul uid, gid, NULL, NULL, rdev); 22190e8cc8bdSWilliam Juul } 22200e8cc8bdSWilliam Juul 2221753ac610SCharles Manning struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent, 2222753ac610SCharles Manning const YCHAR *name, u32 mode, u32 uid, 2223753ac610SCharles Manning u32 gid, const YCHAR *alias) 22240e8cc8bdSWilliam Juul { 2225753ac610SCharles Manning return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode, 22260e8cc8bdSWilliam Juul uid, gid, NULL, alias, 0); 22270e8cc8bdSWilliam Juul } 22280e8cc8bdSWilliam Juul 2229753ac610SCharles Manning /* yaffs_link_obj returns the object id of the equivalent object.*/ 2230753ac610SCharles Manning struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name, 2231753ac610SCharles Manning struct yaffs_obj *equiv_obj) 22320e8cc8bdSWilliam Juul { 2233753ac610SCharles Manning /* Get the real object in case we were fed a hard link obj */ 2234753ac610SCharles Manning equiv_obj = yaffs_get_equivalent_obj(equiv_obj); 22350e8cc8bdSWilliam Juul 2236753ac610SCharles Manning if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK, 2237753ac610SCharles Manning parent, name, 0, 0, 0, 2238753ac610SCharles Manning equiv_obj, NULL, 0)) 2239753ac610SCharles Manning return equiv_obj; 2240753ac610SCharles Manning 22410e8cc8bdSWilliam Juul return NULL; 22420e8cc8bdSWilliam Juul 22430e8cc8bdSWilliam Juul } 22440e8cc8bdSWilliam Juul 2245753ac610SCharles Manning 2246753ac610SCharles Manning 2247753ac610SCharles Manning /*---------------------- Block Management and Page Allocation -------------*/ 2248753ac610SCharles Manning 2249753ac610SCharles Manning static void yaffs_deinit_blocks(struct yaffs_dev *dev) 22500e8cc8bdSWilliam Juul { 2251753ac610SCharles Manning if (dev->block_info_alt && dev->block_info) 2252753ac610SCharles Manning vfree(dev->block_info); 2253753ac610SCharles Manning else 2254753ac610SCharles Manning kfree(dev->block_info); 22550e8cc8bdSWilliam Juul 2256753ac610SCharles Manning dev->block_info_alt = 0; 22570e8cc8bdSWilliam Juul 2258753ac610SCharles Manning dev->block_info = NULL; 2259753ac610SCharles Manning 2260753ac610SCharles Manning if (dev->chunk_bits_alt && dev->chunk_bits) 2261753ac610SCharles Manning vfree(dev->chunk_bits); 2262753ac610SCharles Manning else 2263753ac610SCharles Manning kfree(dev->chunk_bits); 2264753ac610SCharles Manning dev->chunk_bits_alt = 0; 2265753ac610SCharles Manning dev->chunk_bits = NULL; 22660e8cc8bdSWilliam Juul } 22670e8cc8bdSWilliam Juul 2268753ac610SCharles Manning static int yaffs_init_blocks(struct yaffs_dev *dev) 22690e8cc8bdSWilliam Juul { 2270753ac610SCharles Manning int n_blocks = dev->internal_end_block - dev->internal_start_block + 1; 22710e8cc8bdSWilliam Juul 2272753ac610SCharles Manning dev->block_info = NULL; 2273753ac610SCharles Manning dev->chunk_bits = NULL; 2274753ac610SCharles Manning dev->alloc_block = -1; /* force it to get a new one */ 22750e8cc8bdSWilliam Juul 22760e8cc8bdSWilliam Juul /* If the first allocation strategy fails, thry the alternate one */ 2277753ac610SCharles Manning dev->block_info = 2278753ac610SCharles Manning kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS); 2279753ac610SCharles Manning if (!dev->block_info) { 2280753ac610SCharles Manning dev->block_info = 2281753ac610SCharles Manning vmalloc(n_blocks * sizeof(struct yaffs_block_info)); 2282753ac610SCharles Manning dev->block_info_alt = 1; 22830e8cc8bdSWilliam Juul } else { 2284753ac610SCharles Manning dev->block_info_alt = 0; 22850e8cc8bdSWilliam Juul } 22860e8cc8bdSWilliam Juul 2287753ac610SCharles Manning if (!dev->block_info) 2288753ac610SCharles Manning goto alloc_error; 2289753ac610SCharles Manning 2290753ac610SCharles Manning /* Set up dynamic blockinfo stuff. Round up bytes. */ 2291753ac610SCharles Manning dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8; 2292753ac610SCharles Manning dev->chunk_bits = 2293753ac610SCharles Manning kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS); 2294753ac610SCharles Manning if (!dev->chunk_bits) { 2295753ac610SCharles Manning dev->chunk_bits = 2296753ac610SCharles Manning vmalloc(dev->chunk_bit_stride * n_blocks); 2297753ac610SCharles Manning dev->chunk_bits_alt = 1; 2298753ac610SCharles Manning } else { 2299753ac610SCharles Manning dev->chunk_bits_alt = 0; 2300753ac610SCharles Manning } 2301753ac610SCharles Manning if (!dev->chunk_bits) 2302753ac610SCharles Manning goto alloc_error; 2303753ac610SCharles Manning 2304753ac610SCharles Manning 2305753ac610SCharles Manning memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info)); 2306753ac610SCharles Manning memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks); 2307753ac610SCharles Manning return YAFFS_OK; 2308753ac610SCharles Manning 2309753ac610SCharles Manning alloc_error: 2310753ac610SCharles Manning yaffs_deinit_blocks(dev); 2311753ac610SCharles Manning return YAFFS_FAIL; 23120e8cc8bdSWilliam Juul } 23130e8cc8bdSWilliam Juul 23140e8cc8bdSWilliam Juul 2315753ac610SCharles Manning void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no) 23160e8cc8bdSWilliam Juul { 2317753ac610SCharles Manning struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no); 2318753ac610SCharles Manning int erased_ok = 0; 2319753ac610SCharles Manning int i; 23200e8cc8bdSWilliam Juul 23210e8cc8bdSWilliam Juul /* If the block is still healthy erase it and mark as clean. 23220e8cc8bdSWilliam Juul * If the block has had a data failure, then retire it. 23230e8cc8bdSWilliam Juul */ 23240e8cc8bdSWilliam Juul 2325753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE, 2326753ac610SCharles Manning "yaffs_block_became_dirty block %d state %d %s", 2327753ac610SCharles Manning block_no, bi->block_state, 2328753ac610SCharles Manning (bi->needs_retiring) ? "needs retiring" : ""); 23290e8cc8bdSWilliam Juul 2330753ac610SCharles Manning yaffs2_clear_oldest_dirty_seq(dev, bi); 23310e8cc8bdSWilliam Juul 2332753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_DIRTY; 2333753ac610SCharles Manning 2334753ac610SCharles Manning /* If this is the block being garbage collected then stop gc'ing */ 2335753ac610SCharles Manning if (block_no == dev->gc_block) 2336753ac610SCharles Manning dev->gc_block = 0; 2337753ac610SCharles Manning 2338753ac610SCharles Manning /* If this block is currently the best candidate for gc 2339753ac610SCharles Manning * then drop as a candidate */ 2340753ac610SCharles Manning if (block_no == dev->gc_dirtiest) { 2341753ac610SCharles Manning dev->gc_dirtiest = 0; 2342753ac610SCharles Manning dev->gc_pages_in_use = 0; 2343753ac610SCharles Manning } 2344753ac610SCharles Manning 2345753ac610SCharles Manning if (!bi->needs_retiring) { 2346753ac610SCharles Manning yaffs2_checkpt_invalidate(dev); 2347753ac610SCharles Manning erased_ok = yaffs_erase_block(dev, block_no); 2348753ac610SCharles Manning if (!erased_ok) { 2349753ac610SCharles Manning dev->n_erase_failures++; 2350753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, 2351753ac610SCharles Manning "**>> Erasure failed %d", block_no); 23520e8cc8bdSWilliam Juul } 23530e8cc8bdSWilliam Juul } 23540e8cc8bdSWilliam Juul 2355753ac610SCharles Manning /* Verify erasure if needed */ 2356753ac610SCharles Manning if (erased_ok && 2357753ac610SCharles Manning ((yaffs_trace_mask & YAFFS_TRACE_ERASE) || 2358753ac610SCharles Manning !yaffs_skip_verification(dev))) { 2359753ac610SCharles Manning for (i = 0; i < dev->param.chunks_per_block; i++) { 2360753ac610SCharles Manning if (!yaffs_check_chunk_erased(dev, 2361753ac610SCharles Manning block_no * dev->param.chunks_per_block + i)) { 2362753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 2363753ac610SCharles Manning ">>Block %d erasure supposedly OK, but chunk %d not erased", 2364753ac610SCharles Manning block_no, i); 23650e8cc8bdSWilliam Juul } 23660e8cc8bdSWilliam Juul } 23670e8cc8bdSWilliam Juul } 23680e8cc8bdSWilliam Juul 2369753ac610SCharles Manning if (!erased_ok) { 2370753ac610SCharles Manning /* We lost a block of free space */ 2371753ac610SCharles Manning dev->n_free_chunks -= dev->param.chunks_per_block; 2372753ac610SCharles Manning yaffs_retire_block(dev, block_no); 2373753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, 2374753ac610SCharles Manning "**>> Block %d retired", block_no); 2375753ac610SCharles Manning return; 2376753ac610SCharles Manning } 2377753ac610SCharles Manning 23780e8cc8bdSWilliam Juul /* Clean it up... */ 2379753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_EMPTY; 2380753ac610SCharles Manning bi->seq_number = 0; 2381753ac610SCharles Manning dev->n_erased_blocks++; 2382753ac610SCharles Manning bi->pages_in_use = 0; 2383753ac610SCharles Manning bi->soft_del_pages = 0; 2384753ac610SCharles Manning bi->has_shrink_hdr = 0; 2385753ac610SCharles Manning bi->skip_erased_check = 1; /* Clean, so no need to check */ 2386753ac610SCharles Manning bi->gc_prioritise = 0; 2387753ac610SCharles Manning bi->has_summary = 0; 23880e8cc8bdSWilliam Juul 2389753ac610SCharles Manning yaffs_clear_chunk_bits(dev, block_no); 23900e8cc8bdSWilliam Juul 2391753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no); 23920e8cc8bdSWilliam Juul } 23930e8cc8bdSWilliam Juul 2394753ac610SCharles Manning static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev, 2395753ac610SCharles Manning struct yaffs_block_info *bi, 2396753ac610SCharles Manning int old_chunk, u8 *buffer) 23970e8cc8bdSWilliam Juul { 2398753ac610SCharles Manning int new_chunk; 2399753ac610SCharles Manning int mark_flash = 1; 2400753ac610SCharles Manning struct yaffs_ext_tags tags; 2401753ac610SCharles Manning struct yaffs_obj *object; 2402753ac610SCharles Manning int matching_chunk; 2403753ac610SCharles Manning int ret_val = YAFFS_OK; 24040e8cc8bdSWilliam Juul 2405753ac610SCharles Manning memset(&tags, 0, sizeof(tags)); 2406753ac610SCharles Manning yaffs_rd_chunk_tags_nand(dev, old_chunk, 24070e8cc8bdSWilliam Juul buffer, &tags); 2408753ac610SCharles Manning object = yaffs_find_by_number(dev, tags.obj_id); 24090e8cc8bdSWilliam Juul 2410753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC_DETAIL, 2411753ac610SCharles Manning "Collecting chunk in block %d, %d %d %d ", 2412753ac610SCharles Manning dev->gc_chunk, tags.obj_id, 2413753ac610SCharles Manning tags.chunk_id, tags.n_bytes); 24140e8cc8bdSWilliam Juul 2415753ac610SCharles Manning if (object && !yaffs_skip_verification(dev)) { 2416753ac610SCharles Manning if (tags.chunk_id == 0) 2417753ac610SCharles Manning matching_chunk = 2418753ac610SCharles Manning object->hdr_chunk; 2419753ac610SCharles Manning else if (object->soft_del) 2420753ac610SCharles Manning /* Defeat the test */ 2421753ac610SCharles Manning matching_chunk = old_chunk; 24220e8cc8bdSWilliam Juul else 2423753ac610SCharles Manning matching_chunk = 2424753ac610SCharles Manning yaffs_find_chunk_in_file 2425753ac610SCharles Manning (object, tags.chunk_id, 2426753ac610SCharles Manning NULL); 24270e8cc8bdSWilliam Juul 2428753ac610SCharles Manning if (old_chunk != matching_chunk) 2429753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 2430753ac610SCharles Manning "gc: page in gc mismatch: %d %d %d %d", 2431753ac610SCharles Manning old_chunk, 2432753ac610SCharles Manning matching_chunk, 2433753ac610SCharles Manning tags.obj_id, 2434753ac610SCharles Manning tags.chunk_id); 24350e8cc8bdSWilliam Juul } 24360e8cc8bdSWilliam Juul 24370e8cc8bdSWilliam Juul if (!object) { 2438753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 2439753ac610SCharles Manning "page %d in gc has no object: %d %d %d ", 2440753ac610SCharles Manning old_chunk, 2441753ac610SCharles Manning tags.obj_id, tags.chunk_id, 2442753ac610SCharles Manning tags.n_bytes); 24430e8cc8bdSWilliam Juul } 24440e8cc8bdSWilliam Juul 2445753ac610SCharles Manning if (object && 2446753ac610SCharles Manning object->deleted && 2447753ac610SCharles Manning object->soft_del && tags.chunk_id != 0) { 2448753ac610SCharles Manning /* Data chunk in a soft deleted file, 2449753ac610SCharles Manning * throw it away. 24500e8cc8bdSWilliam Juul * It's a soft deleted data chunk, 2451753ac610SCharles Manning * No need to copy this, just forget 2452753ac610SCharles Manning * about it and fix up the object. 24530e8cc8bdSWilliam Juul */ 24540e8cc8bdSWilliam Juul 2455753ac610SCharles Manning /* Free chunks already includes 2456753ac610SCharles Manning * softdeleted chunks, how ever this 2457753ac610SCharles Manning * chunk is going to soon be really 2458753ac610SCharles Manning * deleted which will increment free 2459753ac610SCharles Manning * chunks. We have to decrement free 2460753ac610SCharles Manning * chunks so this works out properly. 2461753ac610SCharles Manning */ 2462753ac610SCharles Manning dev->n_free_chunks--; 2463753ac610SCharles Manning bi->soft_del_pages--; 24640e8cc8bdSWilliam Juul 2465753ac610SCharles Manning object->n_data_chunks--; 2466753ac610SCharles Manning if (object->n_data_chunks <= 0) { 2467753ac610SCharles Manning /* remeber to clean up obj */ 2468753ac610SCharles Manning dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id; 2469753ac610SCharles Manning dev->n_clean_ups++; 24700e8cc8bdSWilliam Juul } 2471753ac610SCharles Manning mark_flash = 0; 24720e8cc8bdSWilliam Juul } else if (object) { 2473753ac610SCharles Manning /* It's either a data chunk in a live 2474753ac610SCharles Manning * file or an ObjectHeader, so we're 2475753ac610SCharles Manning * interested in it. 2476753ac610SCharles Manning * NB Need to keep the ObjectHeaders of 2477753ac610SCharles Manning * deleted files until the whole file 2478753ac610SCharles Manning * has been deleted off 24790e8cc8bdSWilliam Juul */ 2480753ac610SCharles Manning tags.serial_number++; 2481753ac610SCharles Manning dev->n_gc_copies++; 24820e8cc8bdSWilliam Juul 2483753ac610SCharles Manning if (tags.chunk_id == 0) { 24840e8cc8bdSWilliam Juul /* It is an object Id, 2485753ac610SCharles Manning * We need to nuke the 2486753ac610SCharles Manning * shrinkheader flags since its 2487753ac610SCharles Manning * work is done. 2488753ac610SCharles Manning * Also need to clean up 2489753ac610SCharles Manning * shadowing. 24900e8cc8bdSWilliam Juul */ 2491753ac610SCharles Manning struct yaffs_obj_hdr *oh; 2492753ac610SCharles Manning oh = (struct yaffs_obj_hdr *) buffer; 24930e8cc8bdSWilliam Juul 2494753ac610SCharles Manning oh->is_shrink = 0; 2495753ac610SCharles Manning tags.extra_is_shrink = 0; 2496753ac610SCharles Manning oh->shadows_obj = 0; 2497753ac610SCharles Manning oh->inband_shadowed_obj_id = 0; 2498753ac610SCharles Manning tags.extra_shadows = 0; 24990e8cc8bdSWilliam Juul 2500753ac610SCharles Manning /* Update file size */ 2501753ac610SCharles Manning if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) { 2502753ac610SCharles Manning yaffs_oh_size_load(oh, 2503753ac610SCharles Manning object->variant.file_variant.file_size); 2504753ac610SCharles Manning tags.extra_file_size = 2505753ac610SCharles Manning object->variant.file_variant.file_size; 25060e8cc8bdSWilliam Juul } 25070e8cc8bdSWilliam Juul 2508753ac610SCharles Manning yaffs_verify_oh(object, oh, &tags, 1); 2509753ac610SCharles Manning new_chunk = 2510753ac610SCharles Manning yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1); 2511753ac610SCharles Manning } else { 2512753ac610SCharles Manning new_chunk = 2513753ac610SCharles Manning yaffs_write_new_chunk(dev, buffer, &tags, 1); 2514753ac610SCharles Manning } 25150e8cc8bdSWilliam Juul 2516753ac610SCharles Manning if (new_chunk < 0) { 2517753ac610SCharles Manning ret_val = YAFFS_FAIL; 25180e8cc8bdSWilliam Juul } else { 25190e8cc8bdSWilliam Juul 2520753ac610SCharles Manning /* Now fix up the Tnodes etc. */ 25210e8cc8bdSWilliam Juul 2522753ac610SCharles Manning if (tags.chunk_id == 0) { 25230e8cc8bdSWilliam Juul /* It's a header */ 2524753ac610SCharles Manning object->hdr_chunk = new_chunk; 2525753ac610SCharles Manning object->serial = tags.serial_number; 25260e8cc8bdSWilliam Juul } else { 25270e8cc8bdSWilliam Juul /* It's a data chunk */ 2528753ac610SCharles Manning yaffs_put_chunk_in_file(object, tags.chunk_id, 2529753ac610SCharles Manning new_chunk, 0); 25300e8cc8bdSWilliam Juul } 25310e8cc8bdSWilliam Juul } 25320e8cc8bdSWilliam Juul } 2533753ac610SCharles Manning if (ret_val == YAFFS_OK) 2534753ac610SCharles Manning yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__); 2535753ac610SCharles Manning return ret_val; 25360e8cc8bdSWilliam Juul } 25370e8cc8bdSWilliam Juul 2538753ac610SCharles Manning static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block) 2539753ac610SCharles Manning { 2540753ac610SCharles Manning int old_chunk; 2541753ac610SCharles Manning int ret_val = YAFFS_OK; 2542753ac610SCharles Manning int i; 2543753ac610SCharles Manning int is_checkpt_block; 2544753ac610SCharles Manning int max_copies; 2545753ac610SCharles Manning int chunks_before = yaffs_get_erased_chunks(dev); 2546753ac610SCharles Manning int chunks_after; 2547753ac610SCharles Manning struct yaffs_block_info *bi = yaffs_get_block_info(dev, block); 25480e8cc8bdSWilliam Juul 2549753ac610SCharles Manning is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT); 25500e8cc8bdSWilliam Juul 2551753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING, 2552753ac610SCharles Manning "Collecting block %d, in use %d, shrink %d, whole_block %d", 2553753ac610SCharles Manning block, bi->pages_in_use, bi->has_shrink_hdr, 2554753ac610SCharles Manning whole_block); 2555753ac610SCharles Manning 2556753ac610SCharles Manning /*yaffs_verify_free_chunks(dev); */ 2557753ac610SCharles Manning 2558753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_FULL) 2559753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_COLLECTING; 2560753ac610SCharles Manning 2561753ac610SCharles Manning bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */ 2562753ac610SCharles Manning 2563753ac610SCharles Manning dev->gc_disable = 1; 2564753ac610SCharles Manning 2565753ac610SCharles Manning yaffs_summary_gc(dev, block); 2566753ac610SCharles Manning 2567753ac610SCharles Manning if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) { 2568753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING, 2569753ac610SCharles Manning "Collecting block %d that has no chunks in use", 2570753ac610SCharles Manning block); 2571753ac610SCharles Manning yaffs_block_became_dirty(dev, block); 2572753ac610SCharles Manning } else { 2573753ac610SCharles Manning 2574753ac610SCharles Manning u8 *buffer = yaffs_get_temp_buffer(dev); 2575753ac610SCharles Manning 2576753ac610SCharles Manning yaffs_verify_blk(dev, bi, block); 2577753ac610SCharles Manning 2578753ac610SCharles Manning max_copies = (whole_block) ? dev->param.chunks_per_block : 5; 2579753ac610SCharles Manning old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk; 2580753ac610SCharles Manning 2581753ac610SCharles Manning for (/* init already done */ ; 2582753ac610SCharles Manning ret_val == YAFFS_OK && 2583753ac610SCharles Manning dev->gc_chunk < dev->param.chunks_per_block && 2584753ac610SCharles Manning (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) && 2585753ac610SCharles Manning max_copies > 0; 2586753ac610SCharles Manning dev->gc_chunk++, old_chunk++) { 2587753ac610SCharles Manning if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) { 2588753ac610SCharles Manning /* Page is in use and might need to be copied */ 2589753ac610SCharles Manning max_copies--; 2590753ac610SCharles Manning ret_val = yaffs_gc_process_chunk(dev, bi, 2591753ac610SCharles Manning old_chunk, buffer); 2592753ac610SCharles Manning } 2593753ac610SCharles Manning } 2594753ac610SCharles Manning yaffs_release_temp_buffer(dev, buffer); 2595753ac610SCharles Manning } 2596753ac610SCharles Manning 2597753ac610SCharles Manning yaffs_verify_collected_blk(dev, bi, block); 2598753ac610SCharles Manning 2599753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) { 2600753ac610SCharles Manning /* 2601753ac610SCharles Manning * The gc did not complete. Set block state back to FULL 2602753ac610SCharles Manning * because checkpointing does not restore gc. 2603753ac610SCharles Manning */ 2604753ac610SCharles Manning bi->block_state = YAFFS_BLOCK_STATE_FULL; 2605753ac610SCharles Manning } else { 2606753ac610SCharles Manning /* The gc completed. */ 26070e8cc8bdSWilliam Juul /* Do any required cleanups */ 2608753ac610SCharles Manning for (i = 0; i < dev->n_clean_ups; i++) { 26090e8cc8bdSWilliam Juul /* Time to delete the file too */ 2610753ac610SCharles Manning struct yaffs_obj *object = 2611753ac610SCharles Manning yaffs_find_by_number(dev, dev->gc_cleanup_list[i]); 26120e8cc8bdSWilliam Juul if (object) { 2613753ac610SCharles Manning yaffs_free_tnode(dev, 2614753ac610SCharles Manning object->variant.file_variant.top); 2615753ac610SCharles Manning object->variant.file_variant.top = NULL; 2616753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC, 2617753ac610SCharles Manning "yaffs: About to finally delete object %d", 2618753ac610SCharles Manning object->obj_id); 2619753ac610SCharles Manning yaffs_generic_obj_del(object); 2620753ac610SCharles Manning object->my_dev->n_deleted_files--; 26210e8cc8bdSWilliam Juul } 26220e8cc8bdSWilliam Juul 26230e8cc8bdSWilliam Juul } 2624753ac610SCharles Manning chunks_after = yaffs_get_erased_chunks(dev); 2625753ac610SCharles Manning if (chunks_before >= chunks_after) 2626753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC, 2627753ac610SCharles Manning "gc did not increase free chunks before %d after %d", 2628753ac610SCharles Manning chunks_before, chunks_after); 2629753ac610SCharles Manning dev->gc_block = 0; 2630753ac610SCharles Manning dev->gc_chunk = 0; 2631753ac610SCharles Manning dev->n_clean_ups = 0; 26320e8cc8bdSWilliam Juul } 26330e8cc8bdSWilliam Juul 2634753ac610SCharles Manning dev->gc_disable = 0; 26350e8cc8bdSWilliam Juul 2636753ac610SCharles Manning return ret_val; 26370e8cc8bdSWilliam Juul } 26380e8cc8bdSWilliam Juul 2639753ac610SCharles Manning /* 2640753ac610SCharles Manning * find_gc_block() selects the dirtiest block (or close enough) 2641753ac610SCharles Manning * for garbage collection. 2642753ac610SCharles Manning */ 26430e8cc8bdSWilliam Juul 2644753ac610SCharles Manning static unsigned yaffs_find_gc_block(struct yaffs_dev *dev, 2645753ac610SCharles Manning int aggressive, int background) 2646753ac610SCharles Manning { 2647753ac610SCharles Manning int i; 2648753ac610SCharles Manning int iterations; 2649753ac610SCharles Manning unsigned selected = 0; 2650753ac610SCharles Manning int prioritised = 0; 2651753ac610SCharles Manning int prioritised_exist = 0; 2652753ac610SCharles Manning struct yaffs_block_info *bi; 2653753ac610SCharles Manning int threshold; 2654753ac610SCharles Manning 2655753ac610SCharles Manning /* First let's see if we need to grab a prioritised block */ 2656753ac610SCharles Manning if (dev->has_pending_prioritised_gc && !aggressive) { 2657753ac610SCharles Manning dev->gc_dirtiest = 0; 2658753ac610SCharles Manning bi = dev->block_info; 2659753ac610SCharles Manning for (i = dev->internal_start_block; 2660753ac610SCharles Manning i <= dev->internal_end_block && !selected; i++) { 2661753ac610SCharles Manning 2662753ac610SCharles Manning if (bi->gc_prioritise) { 2663753ac610SCharles Manning prioritised_exist = 1; 2664753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_FULL && 2665753ac610SCharles Manning yaffs_block_ok_for_gc(dev, bi)) { 2666753ac610SCharles Manning selected = i; 2667753ac610SCharles Manning prioritised = 1; 2668753ac610SCharles Manning } 2669753ac610SCharles Manning } 2670753ac610SCharles Manning bi++; 2671753ac610SCharles Manning } 2672753ac610SCharles Manning 2673753ac610SCharles Manning /* 2674753ac610SCharles Manning * If there is a prioritised block and none was selected then 2675753ac610SCharles Manning * this happened because there is at least one old dirty block 2676753ac610SCharles Manning * gumming up the works. Let's gc the oldest dirty block. 2677753ac610SCharles Manning */ 2678753ac610SCharles Manning 2679753ac610SCharles Manning if (prioritised_exist && 2680753ac610SCharles Manning !selected && dev->oldest_dirty_block > 0) 2681753ac610SCharles Manning selected = dev->oldest_dirty_block; 2682753ac610SCharles Manning 2683753ac610SCharles Manning if (!prioritised_exist) /* None found, so we can clear this */ 2684753ac610SCharles Manning dev->has_pending_prioritised_gc = 0; 2685753ac610SCharles Manning } 2686753ac610SCharles Manning 2687753ac610SCharles Manning /* If we're doing aggressive GC then we are happy to take a less-dirty 2688753ac610SCharles Manning * block, and search harder. 2689753ac610SCharles Manning * else (leasurely gc), then we only bother to do this if the 2690753ac610SCharles Manning * block has only a few pages in use. 2691753ac610SCharles Manning */ 2692753ac610SCharles Manning 2693753ac610SCharles Manning if (!selected) { 2694753ac610SCharles Manning int pages_used; 2695753ac610SCharles Manning int n_blocks = 2696753ac610SCharles Manning dev->internal_end_block - dev->internal_start_block + 1; 2697753ac610SCharles Manning if (aggressive) { 2698753ac610SCharles Manning threshold = dev->param.chunks_per_block; 2699753ac610SCharles Manning iterations = n_blocks; 2700753ac610SCharles Manning } else { 2701753ac610SCharles Manning int max_threshold; 2702753ac610SCharles Manning 2703753ac610SCharles Manning if (background) 2704753ac610SCharles Manning max_threshold = dev->param.chunks_per_block / 2; 2705753ac610SCharles Manning else 2706753ac610SCharles Manning max_threshold = dev->param.chunks_per_block / 8; 2707753ac610SCharles Manning 2708753ac610SCharles Manning if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD) 2709753ac610SCharles Manning max_threshold = YAFFS_GC_PASSIVE_THRESHOLD; 2710753ac610SCharles Manning 2711753ac610SCharles Manning threshold = background ? (dev->gc_not_done + 2) * 2 : 0; 2712753ac610SCharles Manning if (threshold < YAFFS_GC_PASSIVE_THRESHOLD) 2713753ac610SCharles Manning threshold = YAFFS_GC_PASSIVE_THRESHOLD; 2714753ac610SCharles Manning if (threshold > max_threshold) 2715753ac610SCharles Manning threshold = max_threshold; 2716753ac610SCharles Manning 2717753ac610SCharles Manning iterations = n_blocks / 16 + 1; 2718753ac610SCharles Manning if (iterations > 100) 2719753ac610SCharles Manning iterations = 100; 2720753ac610SCharles Manning } 2721753ac610SCharles Manning 2722753ac610SCharles Manning for (i = 0; 2723753ac610SCharles Manning i < iterations && 2724753ac610SCharles Manning (dev->gc_dirtiest < 1 || 2725753ac610SCharles Manning dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH); 2726753ac610SCharles Manning i++) { 2727753ac610SCharles Manning dev->gc_block_finder++; 2728753ac610SCharles Manning if (dev->gc_block_finder < dev->internal_start_block || 2729753ac610SCharles Manning dev->gc_block_finder > dev->internal_end_block) 2730753ac610SCharles Manning dev->gc_block_finder = 2731753ac610SCharles Manning dev->internal_start_block; 2732753ac610SCharles Manning 2733753ac610SCharles Manning bi = yaffs_get_block_info(dev, dev->gc_block_finder); 2734753ac610SCharles Manning 2735753ac610SCharles Manning pages_used = bi->pages_in_use - bi->soft_del_pages; 2736753ac610SCharles Manning 2737753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_FULL && 2738753ac610SCharles Manning pages_used < dev->param.chunks_per_block && 2739753ac610SCharles Manning (dev->gc_dirtiest < 1 || 2740753ac610SCharles Manning pages_used < dev->gc_pages_in_use) && 2741753ac610SCharles Manning yaffs_block_ok_for_gc(dev, bi)) { 2742753ac610SCharles Manning dev->gc_dirtiest = dev->gc_block_finder; 2743753ac610SCharles Manning dev->gc_pages_in_use = pages_used; 2744753ac610SCharles Manning } 2745753ac610SCharles Manning } 2746753ac610SCharles Manning 2747753ac610SCharles Manning if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold) 2748753ac610SCharles Manning selected = dev->gc_dirtiest; 2749753ac610SCharles Manning } 2750753ac610SCharles Manning 2751753ac610SCharles Manning /* 2752753ac610SCharles Manning * If nothing has been selected for a while, try the oldest dirty 2753753ac610SCharles Manning * because that's gumming up the works. 2754753ac610SCharles Manning */ 2755753ac610SCharles Manning 2756753ac610SCharles Manning if (!selected && dev->param.is_yaffs2 && 2757753ac610SCharles Manning dev->gc_not_done >= (background ? 10 : 20)) { 2758753ac610SCharles Manning yaffs2_find_oldest_dirty_seq(dev); 2759753ac610SCharles Manning if (dev->oldest_dirty_block > 0) { 2760753ac610SCharles Manning selected = dev->oldest_dirty_block; 2761753ac610SCharles Manning dev->gc_dirtiest = selected; 2762753ac610SCharles Manning dev->oldest_dirty_gc_count++; 2763753ac610SCharles Manning bi = yaffs_get_block_info(dev, selected); 2764753ac610SCharles Manning dev->gc_pages_in_use = 2765753ac610SCharles Manning bi->pages_in_use - bi->soft_del_pages; 2766753ac610SCharles Manning } else { 2767753ac610SCharles Manning dev->gc_not_done = 0; 2768753ac610SCharles Manning } 2769753ac610SCharles Manning } 2770753ac610SCharles Manning 2771753ac610SCharles Manning if (selected) { 2772753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC, 2773753ac610SCharles Manning "GC Selected block %d with %d free, prioritised:%d", 2774753ac610SCharles Manning selected, 2775753ac610SCharles Manning dev->param.chunks_per_block - dev->gc_pages_in_use, 2776753ac610SCharles Manning prioritised); 2777753ac610SCharles Manning 2778753ac610SCharles Manning dev->n_gc_blocks++; 2779753ac610SCharles Manning if (background) 2780753ac610SCharles Manning dev->bg_gcs++; 2781753ac610SCharles Manning 2782753ac610SCharles Manning dev->gc_dirtiest = 0; 2783753ac610SCharles Manning dev->gc_pages_in_use = 0; 2784753ac610SCharles Manning dev->gc_not_done = 0; 2785753ac610SCharles Manning if (dev->refresh_skip > 0) 2786753ac610SCharles Manning dev->refresh_skip--; 2787753ac610SCharles Manning } else { 2788753ac610SCharles Manning dev->gc_not_done++; 2789753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC, 2790753ac610SCharles Manning "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s", 2791753ac610SCharles Manning dev->gc_block_finder, dev->gc_not_done, threshold, 2792753ac610SCharles Manning dev->gc_dirtiest, dev->gc_pages_in_use, 2793753ac610SCharles Manning dev->oldest_dirty_block, background ? " bg" : ""); 2794753ac610SCharles Manning } 2795753ac610SCharles Manning 2796753ac610SCharles Manning return selected; 27970e8cc8bdSWilliam Juul } 27980e8cc8bdSWilliam Juul 27990e8cc8bdSWilliam Juul /* New garbage collector 28000e8cc8bdSWilliam Juul * If we're very low on erased blocks then we do aggressive garbage collection 28010e8cc8bdSWilliam Juul * otherwise we do "leasurely" garbage collection. 28020e8cc8bdSWilliam Juul * Aggressive gc looks further (whole array) and will accept less dirty blocks. 2803753ac610SCharles Manning * Passive gc only inspects smaller areas and only accepts more dirty blocks. 28040e8cc8bdSWilliam Juul * 28050e8cc8bdSWilliam Juul * The idea is to help clear out space in a more spread-out manner. 28060e8cc8bdSWilliam Juul * Dunno if it really does anything useful. 28070e8cc8bdSWilliam Juul */ 2808753ac610SCharles Manning static int yaffs_check_gc(struct yaffs_dev *dev, int background) 28090e8cc8bdSWilliam Juul { 2810753ac610SCharles Manning int aggressive = 0; 2811753ac610SCharles Manning int gc_ok = YAFFS_OK; 2812753ac610SCharles Manning int max_tries = 0; 2813753ac610SCharles Manning int min_erased; 2814753ac610SCharles Manning int erased_chunks; 2815753ac610SCharles Manning int checkpt_block_adjust; 28160e8cc8bdSWilliam Juul 2817753ac610SCharles Manning if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0) 2818753ac610SCharles Manning return YAFFS_OK; 28190e8cc8bdSWilliam Juul 2820753ac610SCharles Manning if (dev->gc_disable) 28210e8cc8bdSWilliam Juul /* Bail out so we don't get recursive gc */ 28220e8cc8bdSWilliam Juul return YAFFS_OK; 28230e8cc8bdSWilliam Juul 28240e8cc8bdSWilliam Juul /* This loop should pass the first time. 2825753ac610SCharles Manning * Only loops here if the collection does not increase space. 28260e8cc8bdSWilliam Juul */ 28270e8cc8bdSWilliam Juul 28280e8cc8bdSWilliam Juul do { 2829753ac610SCharles Manning max_tries++; 28300e8cc8bdSWilliam Juul 2831753ac610SCharles Manning checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev); 28320e8cc8bdSWilliam Juul 2833753ac610SCharles Manning min_erased = 2834753ac610SCharles Manning dev->param.n_reserved_blocks + checkpt_block_adjust + 1; 2835753ac610SCharles Manning erased_chunks = 2836753ac610SCharles Manning dev->n_erased_blocks * dev->param.chunks_per_block; 2837753ac610SCharles Manning 2838753ac610SCharles Manning /* If we need a block soon then do aggressive gc. */ 2839753ac610SCharles Manning if (dev->n_erased_blocks < min_erased) 28400e8cc8bdSWilliam Juul aggressive = 1; 2841753ac610SCharles Manning else { 2842753ac610SCharles Manning if (!background 2843753ac610SCharles Manning && erased_chunks > (dev->n_free_chunks / 4)) 2844753ac610SCharles Manning break; 2845753ac610SCharles Manning 2846753ac610SCharles Manning if (dev->gc_skip > 20) 2847753ac610SCharles Manning dev->gc_skip = 20; 2848753ac610SCharles Manning if (erased_chunks < dev->n_free_chunks / 2 || 2849753ac610SCharles Manning dev->gc_skip < 1 || background) 28500e8cc8bdSWilliam Juul aggressive = 0; 2851753ac610SCharles Manning else { 2852753ac610SCharles Manning dev->gc_skip--; 2853753ac610SCharles Manning break; 2854753ac610SCharles Manning } 28550e8cc8bdSWilliam Juul } 28560e8cc8bdSWilliam Juul 2857753ac610SCharles Manning dev->gc_skip = 5; 28580e8cc8bdSWilliam Juul 2859753ac610SCharles Manning /* If we don't already have a block being gc'd then see if we 2860753ac610SCharles Manning * should start another */ 2861753ac610SCharles Manning 2862753ac610SCharles Manning if (dev->gc_block < 1 && !aggressive) { 2863753ac610SCharles Manning dev->gc_block = yaffs2_find_refresh_block(dev); 2864753ac610SCharles Manning dev->gc_chunk = 0; 2865753ac610SCharles Manning dev->n_clean_ups = 0; 2866753ac610SCharles Manning } 2867753ac610SCharles Manning if (dev->gc_block < 1) { 2868753ac610SCharles Manning dev->gc_block = 2869753ac610SCharles Manning yaffs_find_gc_block(dev, aggressive, background); 2870753ac610SCharles Manning dev->gc_chunk = 0; 2871753ac610SCharles Manning dev->n_clean_ups = 0; 28720e8cc8bdSWilliam Juul } 28730e8cc8bdSWilliam Juul 2874753ac610SCharles Manning if (dev->gc_block > 0) { 2875753ac610SCharles Manning dev->all_gcs++; 2876753ac610SCharles Manning if (!aggressive) 2877753ac610SCharles Manning dev->passive_gc_count++; 28780e8cc8bdSWilliam Juul 2879753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC, 2880753ac610SCharles Manning "yaffs: GC n_erased_blocks %d aggressive %d", 2881753ac610SCharles Manning dev->n_erased_blocks, aggressive); 2882753ac610SCharles Manning 2883753ac610SCharles Manning gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive); 28840e8cc8bdSWilliam Juul } 28850e8cc8bdSWilliam Juul 2886753ac610SCharles Manning if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) && 2887753ac610SCharles Manning dev->gc_block > 0) { 2888753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_GC, 2889753ac610SCharles Manning "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d", 2890753ac610SCharles Manning dev->n_erased_blocks, max_tries, 2891753ac610SCharles Manning dev->gc_block); 28920e8cc8bdSWilliam Juul } 2893753ac610SCharles Manning } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) && 2894753ac610SCharles Manning (dev->gc_block > 0) && (max_tries < 2)); 28950e8cc8bdSWilliam Juul 2896753ac610SCharles Manning return aggressive ? gc_ok : YAFFS_OK; 28970e8cc8bdSWilliam Juul } 28980e8cc8bdSWilliam Juul 2899753ac610SCharles Manning /* 2900753ac610SCharles Manning * yaffs_bg_gc() 2901753ac610SCharles Manning * Garbage collects. Intended to be called from a background thread. 2902753ac610SCharles Manning * Returns non-zero if at least half the free chunks are erased. 2903753ac610SCharles Manning */ 2904753ac610SCharles Manning int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency) 29050e8cc8bdSWilliam Juul { 2906753ac610SCharles Manning int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block; 29070e8cc8bdSWilliam Juul 2908753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency); 2909753ac610SCharles Manning 2910753ac610SCharles Manning yaffs_check_gc(dev, 1); 2911753ac610SCharles Manning return erased_chunks > dev->n_free_chunks / 2; 29120e8cc8bdSWilliam Juul } 29130e8cc8bdSWilliam Juul 29140e8cc8bdSWilliam Juul /*-------------------- Data file manipulation -----------------*/ 29150e8cc8bdSWilliam Juul 2916753ac610SCharles Manning static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer) 29170e8cc8bdSWilliam Juul { 2918753ac610SCharles Manning int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL); 29190e8cc8bdSWilliam Juul 2920753ac610SCharles Manning if (nand_chunk >= 0) 2921753ac610SCharles Manning return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk, 29220e8cc8bdSWilliam Juul buffer, NULL); 2923753ac610SCharles Manning else { 2924753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_NANDACCESS, 2925753ac610SCharles Manning "Chunk %d not found zero instead", 2926753ac610SCharles Manning nand_chunk); 29270e8cc8bdSWilliam Juul /* get sane (zero) data if you read a hole */ 2928753ac610SCharles Manning memset(buffer, 0, in->my_dev->data_bytes_per_chunk); 29290e8cc8bdSWilliam Juul return 0; 29300e8cc8bdSWilliam Juul } 29310e8cc8bdSWilliam Juul 29320e8cc8bdSWilliam Juul } 29330e8cc8bdSWilliam Juul 2934753ac610SCharles Manning void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash, 2935753ac610SCharles Manning int lyn) 29360e8cc8bdSWilliam Juul { 29370e8cc8bdSWilliam Juul int block; 29380e8cc8bdSWilliam Juul int page; 2939753ac610SCharles Manning struct yaffs_ext_tags tags; 2940753ac610SCharles Manning struct yaffs_block_info *bi; 29410e8cc8bdSWilliam Juul 2942753ac610SCharles Manning if (chunk_id <= 0) 29430e8cc8bdSWilliam Juul return; 29440e8cc8bdSWilliam Juul 2945753ac610SCharles Manning dev->n_deletions++; 2946753ac610SCharles Manning block = chunk_id / dev->param.chunks_per_block; 2947753ac610SCharles Manning page = chunk_id % dev->param.chunks_per_block; 29480e8cc8bdSWilliam Juul 2949753ac610SCharles Manning if (!yaffs_check_chunk_bit(dev, block, page)) 2950753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_VERIFY, 2951753ac610SCharles Manning "Deleting invalid chunk %d", chunk_id); 29520e8cc8bdSWilliam Juul 2953753ac610SCharles Manning bi = yaffs_get_block_info(dev, block); 29540e8cc8bdSWilliam Juul 2955753ac610SCharles Manning yaffs2_update_oldest_dirty_seq(dev, block, bi); 29560e8cc8bdSWilliam Juul 2957753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_DELETION, 2958753ac610SCharles Manning "line %d delete of chunk %d", 2959753ac610SCharles Manning lyn, chunk_id); 29600e8cc8bdSWilliam Juul 2961753ac610SCharles Manning if (!dev->param.is_yaffs2 && mark_flash && 2962753ac610SCharles Manning bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) { 29630e8cc8bdSWilliam Juul 2964753ac610SCharles Manning memset(&tags, 0, sizeof(tags)); 2965753ac610SCharles Manning tags.is_deleted = 1; 2966753ac610SCharles Manning yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags); 2967753ac610SCharles Manning yaffs_handle_chunk_update(dev, chunk_id, &tags); 29680e8cc8bdSWilliam Juul } else { 2969753ac610SCharles Manning dev->n_unmarked_deletions++; 29700e8cc8bdSWilliam Juul } 29710e8cc8bdSWilliam Juul 29720e8cc8bdSWilliam Juul /* Pull out of the management area. 29730e8cc8bdSWilliam Juul * If the whole block became dirty, this will kick off an erasure. 29740e8cc8bdSWilliam Juul */ 2975753ac610SCharles Manning if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING || 2976753ac610SCharles Manning bi->block_state == YAFFS_BLOCK_STATE_FULL || 2977753ac610SCharles Manning bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN || 2978753ac610SCharles Manning bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) { 2979753ac610SCharles Manning dev->n_free_chunks++; 2980753ac610SCharles Manning yaffs_clear_chunk_bit(dev, block, page); 2981753ac610SCharles Manning bi->pages_in_use--; 29820e8cc8bdSWilliam Juul 2983753ac610SCharles Manning if (bi->pages_in_use == 0 && 2984753ac610SCharles Manning !bi->has_shrink_hdr && 2985753ac610SCharles Manning bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING && 2986753ac610SCharles Manning bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) { 2987753ac610SCharles Manning yaffs_block_became_dirty(dev, block); 2988753ac610SCharles Manning } 2989753ac610SCharles Manning } 29900e8cc8bdSWilliam Juul } 29910e8cc8bdSWilliam Juul 2992753ac610SCharles Manning static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk, 2993753ac610SCharles Manning const u8 *buffer, int n_bytes, int use_reserve) 29940e8cc8bdSWilliam Juul { 29950e8cc8bdSWilliam Juul /* Find old chunk Need to do this to get serial number 29960e8cc8bdSWilliam Juul * Write new one and patch into tree. 29970e8cc8bdSWilliam Juul * Invalidate old tags. 29980e8cc8bdSWilliam Juul */ 29990e8cc8bdSWilliam Juul 3000753ac610SCharles Manning int prev_chunk_id; 3001753ac610SCharles Manning struct yaffs_ext_tags prev_tags; 3002753ac610SCharles Manning int new_chunk_id; 3003753ac610SCharles Manning struct yaffs_ext_tags new_tags; 3004753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev; 30050e8cc8bdSWilliam Juul 3006753ac610SCharles Manning yaffs_check_gc(dev, 0); 30070e8cc8bdSWilliam Juul 3008753ac610SCharles Manning /* Get the previous chunk at this location in the file if it exists. 3009753ac610SCharles Manning * If it does not exist then put a zero into the tree. This creates 3010753ac610SCharles Manning * the tnode now, rather than later when it is harder to clean up. 3011753ac610SCharles Manning */ 3012753ac610SCharles Manning prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags); 3013753ac610SCharles Manning if (prev_chunk_id < 1 && 3014753ac610SCharles Manning !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0)) 3015753ac610SCharles Manning return 0; 30160e8cc8bdSWilliam Juul 30170e8cc8bdSWilliam Juul /* Set up new tags */ 3018753ac610SCharles Manning memset(&new_tags, 0, sizeof(new_tags)); 30190e8cc8bdSWilliam Juul 3020753ac610SCharles Manning new_tags.chunk_id = inode_chunk; 3021753ac610SCharles Manning new_tags.obj_id = in->obj_id; 3022753ac610SCharles Manning new_tags.serial_number = 3023753ac610SCharles Manning (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1; 3024753ac610SCharles Manning new_tags.n_bytes = n_bytes; 30250e8cc8bdSWilliam Juul 3026753ac610SCharles Manning if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) { 3027753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 3028753ac610SCharles Manning "Writing %d bytes to chunk!!!!!!!!!", 3029753ac610SCharles Manning n_bytes); 3030753ac610SCharles Manning BUG(); 3031753ac610SCharles Manning } 30320e8cc8bdSWilliam Juul 3033753ac610SCharles Manning new_chunk_id = 3034753ac610SCharles Manning yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve); 30350e8cc8bdSWilliam Juul 3036753ac610SCharles Manning if (new_chunk_id > 0) { 3037753ac610SCharles Manning yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0); 3038753ac610SCharles Manning 3039753ac610SCharles Manning if (prev_chunk_id > 0) 3040753ac610SCharles Manning yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__); 3041753ac610SCharles Manning 3042753ac610SCharles Manning yaffs_verify_file_sane(in); 3043753ac610SCharles Manning } 3044753ac610SCharles Manning return new_chunk_id; 30450e8cc8bdSWilliam Juul 30460e8cc8bdSWilliam Juul } 30470e8cc8bdSWilliam Juul 30480e8cc8bdSWilliam Juul 3049753ac610SCharles Manning 3050753ac610SCharles Manning static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set, 3051753ac610SCharles Manning const YCHAR *name, const void *value, int size, 3052753ac610SCharles Manning int flags) 3053753ac610SCharles Manning { 3054753ac610SCharles Manning struct yaffs_xattr_mod xmod; 3055753ac610SCharles Manning int result; 3056753ac610SCharles Manning 3057753ac610SCharles Manning xmod.set = set; 3058753ac610SCharles Manning xmod.name = name; 3059753ac610SCharles Manning xmod.data = value; 3060753ac610SCharles Manning xmod.size = size; 3061753ac610SCharles Manning xmod.flags = flags; 3062753ac610SCharles Manning xmod.result = -ENOSPC; 3063753ac610SCharles Manning 3064753ac610SCharles Manning result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod); 3065753ac610SCharles Manning 3066753ac610SCharles Manning if (result > 0) 3067753ac610SCharles Manning return xmod.result; 3068753ac610SCharles Manning else 3069753ac610SCharles Manning return -ENOSPC; 3070753ac610SCharles Manning } 3071753ac610SCharles Manning 3072753ac610SCharles Manning static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer, 3073753ac610SCharles Manning struct yaffs_xattr_mod *xmod) 3074753ac610SCharles Manning { 3075753ac610SCharles Manning int retval = 0; 3076753ac610SCharles Manning int x_offs = sizeof(struct yaffs_obj_hdr); 3077753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev; 3078753ac610SCharles Manning int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr); 3079753ac610SCharles Manning char *x_buffer = buffer + x_offs; 3080753ac610SCharles Manning 3081753ac610SCharles Manning if (xmod->set) 3082753ac610SCharles Manning retval = 3083753ac610SCharles Manning nval_set(x_buffer, x_size, xmod->name, xmod->data, 3084753ac610SCharles Manning xmod->size, xmod->flags); 3085753ac610SCharles Manning else 3086753ac610SCharles Manning retval = nval_del(x_buffer, x_size, xmod->name); 3087753ac610SCharles Manning 3088753ac610SCharles Manning obj->has_xattr = nval_hasvalues(x_buffer, x_size); 3089753ac610SCharles Manning obj->xattr_known = 1; 3090753ac610SCharles Manning xmod->result = retval; 3091753ac610SCharles Manning 3092753ac610SCharles Manning return retval; 3093753ac610SCharles Manning } 3094753ac610SCharles Manning 3095753ac610SCharles Manning static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name, 3096753ac610SCharles Manning void *value, int size) 3097753ac610SCharles Manning { 3098753ac610SCharles Manning char *buffer = NULL; 3099753ac610SCharles Manning int result; 3100753ac610SCharles Manning struct yaffs_ext_tags tags; 3101753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev; 3102753ac610SCharles Manning int x_offs = sizeof(struct yaffs_obj_hdr); 3103753ac610SCharles Manning int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr); 3104753ac610SCharles Manning char *x_buffer; 3105753ac610SCharles Manning int retval = 0; 3106753ac610SCharles Manning 3107753ac610SCharles Manning if (obj->hdr_chunk < 1) 3108753ac610SCharles Manning return -ENODATA; 3109753ac610SCharles Manning 3110753ac610SCharles Manning /* If we know that the object has no xattribs then don't do all the 3111753ac610SCharles Manning * reading and parsing. 3112753ac610SCharles Manning */ 3113753ac610SCharles Manning if (obj->xattr_known && !obj->has_xattr) { 3114753ac610SCharles Manning if (name) 3115753ac610SCharles Manning return -ENODATA; 3116753ac610SCharles Manning else 3117753ac610SCharles Manning return 0; 3118753ac610SCharles Manning } 3119753ac610SCharles Manning 3120753ac610SCharles Manning buffer = (char *)yaffs_get_temp_buffer(dev); 3121753ac610SCharles Manning if (!buffer) 3122753ac610SCharles Manning return -ENOMEM; 3123753ac610SCharles Manning 3124753ac610SCharles Manning result = 3125753ac610SCharles Manning yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags); 3126753ac610SCharles Manning 3127753ac610SCharles Manning if (result != YAFFS_OK) 3128753ac610SCharles Manning retval = -ENOENT; 3129753ac610SCharles Manning else { 3130753ac610SCharles Manning x_buffer = buffer + x_offs; 3131753ac610SCharles Manning 3132753ac610SCharles Manning if (!obj->xattr_known) { 3133753ac610SCharles Manning obj->has_xattr = nval_hasvalues(x_buffer, x_size); 3134753ac610SCharles Manning obj->xattr_known = 1; 3135753ac610SCharles Manning } 3136753ac610SCharles Manning 3137753ac610SCharles Manning if (name) 3138753ac610SCharles Manning retval = nval_get(x_buffer, x_size, name, value, size); 3139753ac610SCharles Manning else 3140753ac610SCharles Manning retval = nval_list(x_buffer, x_size, value, size); 3141753ac610SCharles Manning } 3142753ac610SCharles Manning yaffs_release_temp_buffer(dev, (u8 *) buffer); 3143753ac610SCharles Manning return retval; 3144753ac610SCharles Manning } 3145753ac610SCharles Manning 3146753ac610SCharles Manning int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name, 3147753ac610SCharles Manning const void *value, int size, int flags) 3148753ac610SCharles Manning { 3149753ac610SCharles Manning return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags); 3150753ac610SCharles Manning } 3151753ac610SCharles Manning 3152753ac610SCharles Manning int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name) 3153753ac610SCharles Manning { 3154753ac610SCharles Manning return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0); 3155753ac610SCharles Manning } 3156753ac610SCharles Manning 3157753ac610SCharles Manning int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value, 3158753ac610SCharles Manning int size) 3159753ac610SCharles Manning { 3160753ac610SCharles Manning return yaffs_do_xattrib_fetch(obj, name, value, size); 3161753ac610SCharles Manning } 3162753ac610SCharles Manning 3163753ac610SCharles Manning int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size) 3164753ac610SCharles Manning { 3165753ac610SCharles Manning return yaffs_do_xattrib_fetch(obj, NULL, buffer, size); 3166753ac610SCharles Manning } 3167753ac610SCharles Manning 3168753ac610SCharles Manning static void yaffs_check_obj_details_loaded(struct yaffs_obj *in) 3169753ac610SCharles Manning { 3170753ac610SCharles Manning u8 *buf; 3171753ac610SCharles Manning struct yaffs_obj_hdr *oh; 3172753ac610SCharles Manning struct yaffs_dev *dev; 3173753ac610SCharles Manning struct yaffs_ext_tags tags; 3174753ac610SCharles Manning 3175753ac610SCharles Manning if (!in || !in->lazy_loaded || in->hdr_chunk < 1) 3176753ac610SCharles Manning return; 3177753ac610SCharles Manning 3178753ac610SCharles Manning dev = in->my_dev; 3179753ac610SCharles Manning in->lazy_loaded = 0; 3180753ac610SCharles Manning buf = yaffs_get_temp_buffer(dev); 3181753ac610SCharles Manning 3182*8cc64bafSAnatolij Gustschin yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags); 3183753ac610SCharles Manning oh = (struct yaffs_obj_hdr *)buf; 3184753ac610SCharles Manning 3185753ac610SCharles Manning in->yst_mode = oh->yst_mode; 3186753ac610SCharles Manning yaffs_load_attribs(in, oh); 3187753ac610SCharles Manning yaffs_set_obj_name_from_oh(in, oh); 3188753ac610SCharles Manning 3189753ac610SCharles Manning if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) { 3190753ac610SCharles Manning in->variant.symlink_variant.alias = 3191753ac610SCharles Manning yaffs_clone_str(oh->alias); 3192753ac610SCharles Manning } 3193753ac610SCharles Manning yaffs_release_temp_buffer(dev, buf); 3194753ac610SCharles Manning } 3195753ac610SCharles Manning 3196753ac610SCharles Manning static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name, 3197753ac610SCharles Manning const YCHAR *oh_name, int buff_size) 3198753ac610SCharles Manning { 3199753ac610SCharles Manning #ifdef CONFIG_YAFFS_AUTO_UNICODE 3200753ac610SCharles Manning if (dev->param.auto_unicode) { 3201753ac610SCharles Manning if (*oh_name) { 3202753ac610SCharles Manning /* It is an ASCII name, do an ASCII to 3203753ac610SCharles Manning * unicode conversion */ 3204753ac610SCharles Manning const char *ascii_oh_name = (const char *)oh_name; 3205753ac610SCharles Manning int n = buff_size - 1; 3206753ac610SCharles Manning while (n > 0 && *ascii_oh_name) { 3207753ac610SCharles Manning *name = *ascii_oh_name; 3208753ac610SCharles Manning name++; 3209753ac610SCharles Manning ascii_oh_name++; 3210753ac610SCharles Manning n--; 3211753ac610SCharles Manning } 3212753ac610SCharles Manning } else { 3213753ac610SCharles Manning yaffs_strncpy(name, oh_name + 1, buff_size - 1); 3214753ac610SCharles Manning } 3215753ac610SCharles Manning } else { 3216753ac610SCharles Manning #else 3217753ac610SCharles Manning dev = dev; 3218753ac610SCharles Manning { 3219753ac610SCharles Manning #endif 3220753ac610SCharles Manning yaffs_strncpy(name, oh_name, buff_size - 1); 3221753ac610SCharles Manning } 3222753ac610SCharles Manning } 3223753ac610SCharles Manning 3224753ac610SCharles Manning static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name, 3225753ac610SCharles Manning const YCHAR *name) 3226753ac610SCharles Manning { 3227753ac610SCharles Manning #ifdef CONFIG_YAFFS_AUTO_UNICODE 3228753ac610SCharles Manning 3229753ac610SCharles Manning int is_ascii; 3230753ac610SCharles Manning YCHAR *w; 3231753ac610SCharles Manning 3232753ac610SCharles Manning if (dev->param.auto_unicode) { 3233753ac610SCharles Manning 3234753ac610SCharles Manning is_ascii = 1; 3235753ac610SCharles Manning w = name; 3236753ac610SCharles Manning 3237753ac610SCharles Manning /* Figure out if the name will fit in ascii character set */ 3238753ac610SCharles Manning while (is_ascii && *w) { 3239753ac610SCharles Manning if ((*w) & 0xff00) 3240753ac610SCharles Manning is_ascii = 0; 3241753ac610SCharles Manning w++; 3242753ac610SCharles Manning } 3243753ac610SCharles Manning 3244753ac610SCharles Manning if (is_ascii) { 3245753ac610SCharles Manning /* It is an ASCII name, so convert unicode to ascii */ 3246753ac610SCharles Manning char *ascii_oh_name = (char *)oh_name; 3247753ac610SCharles Manning int n = YAFFS_MAX_NAME_LENGTH - 1; 3248753ac610SCharles Manning while (n > 0 && *name) { 3249753ac610SCharles Manning *ascii_oh_name = *name; 3250753ac610SCharles Manning name++; 3251753ac610SCharles Manning ascii_oh_name++; 3252753ac610SCharles Manning n--; 3253753ac610SCharles Manning } 3254753ac610SCharles Manning } else { 3255753ac610SCharles Manning /* Unicode name, so save starting at the second YCHAR */ 3256753ac610SCharles Manning *oh_name = 0; 3257753ac610SCharles Manning yaffs_strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2); 3258753ac610SCharles Manning } 3259753ac610SCharles Manning } else { 3260753ac610SCharles Manning #else 3261753ac610SCharles Manning dev = dev; 3262753ac610SCharles Manning { 3263753ac610SCharles Manning #endif 3264753ac610SCharles Manning yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1); 3265753ac610SCharles Manning } 32660e8cc8bdSWilliam Juul } 32670e8cc8bdSWilliam Juul 32680e8cc8bdSWilliam Juul /* UpdateObjectHeader updates the header on NAND for an object. 32690e8cc8bdSWilliam Juul * If name is not NULL, then that new name is used. 32700e8cc8bdSWilliam Juul */ 3271753ac610SCharles Manning int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force, 3272753ac610SCharles Manning int is_shrink, int shadows, struct yaffs_xattr_mod *xmod) 32730e8cc8bdSWilliam Juul { 32740e8cc8bdSWilliam Juul 3275753ac610SCharles Manning struct yaffs_block_info *bi; 3276753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev; 3277753ac610SCharles Manning int prev_chunk_id; 3278753ac610SCharles Manning int ret_val = 0; 3279753ac610SCharles Manning int new_chunk_id; 3280753ac610SCharles Manning struct yaffs_ext_tags new_tags; 3281753ac610SCharles Manning struct yaffs_ext_tags old_tags; 3282753ac610SCharles Manning const YCHAR *alias = NULL; 3283753ac610SCharles Manning u8 *buffer = NULL; 3284753ac610SCharles Manning YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1]; 3285753ac610SCharles Manning struct yaffs_obj_hdr *oh = NULL; 3286753ac610SCharles Manning loff_t file_size = 0; 32870e8cc8bdSWilliam Juul 3288753ac610SCharles Manning yaffs_strcpy(old_name, _Y("silly old name")); 32890e8cc8bdSWilliam Juul 3290753ac610SCharles Manning if (in->fake && in != dev->root_dir && !force && !xmod) 3291753ac610SCharles Manning return ret_val; 32920e8cc8bdSWilliam Juul 3293753ac610SCharles Manning yaffs_check_gc(dev, 0); 3294753ac610SCharles Manning yaffs_check_obj_details_loaded(in); 32950e8cc8bdSWilliam Juul 3296753ac610SCharles Manning buffer = yaffs_get_temp_buffer(in->my_dev); 3297753ac610SCharles Manning oh = (struct yaffs_obj_hdr *)buffer; 32980e8cc8bdSWilliam Juul 3299753ac610SCharles Manning prev_chunk_id = in->hdr_chunk; 33000e8cc8bdSWilliam Juul 3301753ac610SCharles Manning if (prev_chunk_id > 0) { 3302*8cc64bafSAnatolij Gustschin yaffs_rd_chunk_tags_nand(dev, prev_chunk_id, 3303753ac610SCharles Manning buffer, &old_tags); 33040e8cc8bdSWilliam Juul 3305753ac610SCharles Manning yaffs_verify_oh(in, oh, &old_tags, 0); 3306753ac610SCharles Manning memcpy(old_name, oh->name, sizeof(oh->name)); 3307753ac610SCharles Manning memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr)); 33080e8cc8bdSWilliam Juul } else { 3309753ac610SCharles Manning memset(buffer, 0xff, dev->data_bytes_per_chunk); 33100e8cc8bdSWilliam Juul } 33110e8cc8bdSWilliam Juul 3312753ac610SCharles Manning oh->type = in->variant_type; 3313753ac610SCharles Manning oh->yst_mode = in->yst_mode; 3314753ac610SCharles Manning oh->shadows_obj = oh->inband_shadowed_obj_id = shadows; 3315753ac610SCharles Manning 3316753ac610SCharles Manning yaffs_load_attribs_oh(oh, in); 3317753ac610SCharles Manning 3318753ac610SCharles Manning if (in->parent) 3319753ac610SCharles Manning oh->parent_obj_id = in->parent->obj_id; 3320753ac610SCharles Manning else 3321753ac610SCharles Manning oh->parent_obj_id = 0; 3322753ac610SCharles Manning 33230e8cc8bdSWilliam Juul if (name && *name) { 33240e8cc8bdSWilliam Juul memset(oh->name, 0, sizeof(oh->name)); 3325753ac610SCharles Manning yaffs_load_oh_from_name(dev, oh->name, name); 3326753ac610SCharles Manning } else if (prev_chunk_id > 0) { 3327753ac610SCharles Manning memcpy(oh->name, old_name, sizeof(oh->name)); 33280e8cc8bdSWilliam Juul } else { 33290e8cc8bdSWilliam Juul memset(oh->name, 0, sizeof(oh->name)); 33300e8cc8bdSWilliam Juul } 33310e8cc8bdSWilliam Juul 3332753ac610SCharles Manning oh->is_shrink = is_shrink; 33330e8cc8bdSWilliam Juul 3334753ac610SCharles Manning switch (in->variant_type) { 33350e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_UNKNOWN: 33360e8cc8bdSWilliam Juul /* Should not happen */ 33370e8cc8bdSWilliam Juul break; 33380e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_FILE: 3339753ac610SCharles Manning if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED && 3340753ac610SCharles Manning oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED) 3341753ac610SCharles Manning file_size = in->variant.file_variant.file_size; 3342753ac610SCharles Manning yaffs_oh_size_load(oh, file_size); 33430e8cc8bdSWilliam Juul break; 33440e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_HARDLINK: 3345753ac610SCharles Manning oh->equiv_id = in->variant.hardlink_variant.equiv_id; 33460e8cc8bdSWilliam Juul break; 33470e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SPECIAL: 33480e8cc8bdSWilliam Juul /* Do nothing */ 33490e8cc8bdSWilliam Juul break; 33500e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_DIRECTORY: 33510e8cc8bdSWilliam Juul /* Do nothing */ 33520e8cc8bdSWilliam Juul break; 33530e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SYMLINK: 3354753ac610SCharles Manning alias = in->variant.symlink_variant.alias; 3355753ac610SCharles Manning if (!alias) 3356753ac610SCharles Manning alias = _Y("no alias"); 3357753ac610SCharles Manning yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH); 33580e8cc8bdSWilliam Juul oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; 33590e8cc8bdSWilliam Juul break; 33600e8cc8bdSWilliam Juul } 33610e8cc8bdSWilliam Juul 3362753ac610SCharles Manning /* process any xattrib modifications */ 3363753ac610SCharles Manning if (xmod) 3364753ac610SCharles Manning yaffs_apply_xattrib_mod(in, (char *)buffer, xmod); 3365753ac610SCharles Manning 33660e8cc8bdSWilliam Juul /* Tags */ 3367753ac610SCharles Manning memset(&new_tags, 0, sizeof(new_tags)); 33680e8cc8bdSWilliam Juul in->serial++; 3369753ac610SCharles Manning new_tags.chunk_id = 0; 3370753ac610SCharles Manning new_tags.obj_id = in->obj_id; 3371753ac610SCharles Manning new_tags.serial_number = in->serial; 33720e8cc8bdSWilliam Juul 33730e8cc8bdSWilliam Juul /* Add extra info for file header */ 3374753ac610SCharles Manning new_tags.extra_available = 1; 3375753ac610SCharles Manning new_tags.extra_parent_id = oh->parent_obj_id; 3376753ac610SCharles Manning new_tags.extra_file_size = file_size; 3377753ac610SCharles Manning new_tags.extra_is_shrink = oh->is_shrink; 3378753ac610SCharles Manning new_tags.extra_equiv_id = oh->equiv_id; 3379753ac610SCharles Manning new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0; 3380753ac610SCharles Manning new_tags.extra_obj_type = in->variant_type; 3381753ac610SCharles Manning yaffs_verify_oh(in, oh, &new_tags, 1); 33820e8cc8bdSWilliam Juul 33830e8cc8bdSWilliam Juul /* Create new chunk in NAND */ 3384753ac610SCharles Manning new_chunk_id = 3385753ac610SCharles Manning yaffs_write_new_chunk(dev, buffer, &new_tags, 3386753ac610SCharles Manning (prev_chunk_id > 0) ? 1 : 0); 33870e8cc8bdSWilliam Juul 33880e8cc8bdSWilliam Juul if (buffer) 3389753ac610SCharles Manning yaffs_release_temp_buffer(dev, buffer); 33900e8cc8bdSWilliam Juul 3391753ac610SCharles Manning if (new_chunk_id < 0) 3392753ac610SCharles Manning return new_chunk_id; 33930e8cc8bdSWilliam Juul 3394753ac610SCharles Manning in->hdr_chunk = new_chunk_id; 33950e8cc8bdSWilliam Juul 3396753ac610SCharles Manning if (prev_chunk_id > 0) 3397753ac610SCharles Manning yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__); 33980e8cc8bdSWilliam Juul 3399753ac610SCharles Manning if (!yaffs_obj_cache_dirty(in)) 3400753ac610SCharles Manning in->dirty = 0; 34010e8cc8bdSWilliam Juul 3402753ac610SCharles Manning /* If this was a shrink, then mark the block 3403753ac610SCharles Manning * that the chunk lives on */ 3404753ac610SCharles Manning if (is_shrink) { 3405753ac610SCharles Manning bi = yaffs_get_block_info(in->my_dev, 3406753ac610SCharles Manning new_chunk_id / 3407753ac610SCharles Manning in->my_dev->param.chunks_per_block); 3408753ac610SCharles Manning bi->has_shrink_hdr = 1; 34090e8cc8bdSWilliam Juul } 34100e8cc8bdSWilliam Juul 34110e8cc8bdSWilliam Juul 3412753ac610SCharles Manning return new_chunk_id; 34130e8cc8bdSWilliam Juul } 34140e8cc8bdSWilliam Juul 34150e8cc8bdSWilliam Juul /*--------------------- File read/write ------------------------ 34160e8cc8bdSWilliam Juul * Read and write have very similar structures. 34170e8cc8bdSWilliam Juul * In general the read/write has three parts to it 34180e8cc8bdSWilliam Juul * An incomplete chunk to start with (if the read/write is not chunk-aligned) 34190e8cc8bdSWilliam Juul * Some complete chunks 34200e8cc8bdSWilliam Juul * An incomplete chunk to end off with 34210e8cc8bdSWilliam Juul * 34220e8cc8bdSWilliam Juul * Curve-balls: the first chunk might also be the last chunk. 34230e8cc8bdSWilliam Juul */ 34240e8cc8bdSWilliam Juul 3425753ac610SCharles Manning int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes) 34260e8cc8bdSWilliam Juul { 3427753ac610SCharles Manning int chunk; 3428753ac610SCharles Manning u32 start; 3429753ac610SCharles Manning int n_copy; 3430753ac610SCharles Manning int n = n_bytes; 3431753ac610SCharles Manning int n_done = 0; 3432753ac610SCharles Manning struct yaffs_cache *cache; 3433753ac610SCharles Manning struct yaffs_dev *dev; 34340e8cc8bdSWilliam Juul 3435753ac610SCharles Manning dev = in->my_dev; 34360e8cc8bdSWilliam Juul 34370e8cc8bdSWilliam Juul while (n > 0) { 3438753ac610SCharles Manning yaffs_addr_to_chunk(dev, offset, &chunk, &start); 34390e8cc8bdSWilliam Juul chunk++; 34400e8cc8bdSWilliam Juul 34410e8cc8bdSWilliam Juul /* OK now check for the curveball where the start and end are in 34420e8cc8bdSWilliam Juul * the same chunk. 34430e8cc8bdSWilliam Juul */ 3444753ac610SCharles Manning if ((start + n) < dev->data_bytes_per_chunk) 3445753ac610SCharles Manning n_copy = n; 3446753ac610SCharles Manning else 3447753ac610SCharles Manning n_copy = dev->data_bytes_per_chunk - start; 34480e8cc8bdSWilliam Juul 3449753ac610SCharles Manning cache = yaffs_find_chunk_cache(in, chunk); 34500e8cc8bdSWilliam Juul 3451753ac610SCharles Manning /* If the chunk is already in the cache or it is less than 3452753ac610SCharles Manning * a whole chunk or we're using inband tags then use the cache 3453753ac610SCharles Manning * (if there is caching) else bypass the cache. 34540e8cc8bdSWilliam Juul */ 3455753ac610SCharles Manning if (cache || n_copy != dev->data_bytes_per_chunk || 3456753ac610SCharles Manning dev->param.inband_tags) { 3457753ac610SCharles Manning if (dev->param.n_caches > 0) { 34580e8cc8bdSWilliam Juul 3459753ac610SCharles Manning /* If we can't find the data in the cache, 3460753ac610SCharles Manning * then load it up. */ 34610e8cc8bdSWilliam Juul 34620e8cc8bdSWilliam Juul if (!cache) { 3463753ac610SCharles Manning cache = 3464753ac610SCharles Manning yaffs_grab_chunk_cache(in->my_dev); 34650e8cc8bdSWilliam Juul cache->object = in; 3466753ac610SCharles Manning cache->chunk_id = chunk; 34670e8cc8bdSWilliam Juul cache->dirty = 0; 34680e8cc8bdSWilliam Juul cache->locked = 0; 3469753ac610SCharles Manning yaffs_rd_data_obj(in, chunk, 3470753ac610SCharles Manning cache->data); 3471753ac610SCharles Manning cache->n_bytes = 0; 34720e8cc8bdSWilliam Juul } 34730e8cc8bdSWilliam Juul 3474753ac610SCharles Manning yaffs_use_cache(dev, cache, 0); 34750e8cc8bdSWilliam Juul 34760e8cc8bdSWilliam Juul cache->locked = 1; 34770e8cc8bdSWilliam Juul 3478753ac610SCharles Manning memcpy(buffer, &cache->data[start], n_copy); 34790e8cc8bdSWilliam Juul 34800e8cc8bdSWilliam Juul cache->locked = 0; 34810e8cc8bdSWilliam Juul } else { 34820e8cc8bdSWilliam Juul /* Read into the local buffer then copy.. */ 34830e8cc8bdSWilliam Juul 3484753ac610SCharles Manning u8 *local_buffer = 3485753ac610SCharles Manning yaffs_get_temp_buffer(dev); 3486753ac610SCharles Manning yaffs_rd_data_obj(in, chunk, local_buffer); 34870e8cc8bdSWilliam Juul 3488753ac610SCharles Manning memcpy(buffer, &local_buffer[start], n_copy); 3489753ac610SCharles Manning 3490753ac610SCharles Manning yaffs_release_temp_buffer(dev, local_buffer); 34910e8cc8bdSWilliam Juul } 34920e8cc8bdSWilliam Juul } else { 3493753ac610SCharles Manning /* A full chunk. Read directly into the buffer. */ 3494753ac610SCharles Manning yaffs_rd_data_obj(in, chunk, buffer); 3495753ac610SCharles Manning } 3496753ac610SCharles Manning n -= n_copy; 3497753ac610SCharles Manning offset += n_copy; 3498753ac610SCharles Manning buffer += n_copy; 3499753ac610SCharles Manning n_done += n_copy; 3500753ac610SCharles Manning } 3501753ac610SCharles Manning return n_done; 35020e8cc8bdSWilliam Juul } 35030e8cc8bdSWilliam Juul 3504753ac610SCharles Manning int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset, 3505753ac610SCharles Manning int n_bytes, int write_through) 35060e8cc8bdSWilliam Juul { 35070e8cc8bdSWilliam Juul 3508753ac610SCharles Manning int chunk; 3509753ac610SCharles Manning u32 start; 3510753ac610SCharles Manning int n_copy; 3511753ac610SCharles Manning int n = n_bytes; 3512753ac610SCharles Manning int n_done = 0; 3513753ac610SCharles Manning int n_writeback; 3514753ac610SCharles Manning loff_t start_write = offset; 3515753ac610SCharles Manning int chunk_written = 0; 3516753ac610SCharles Manning u32 n_bytes_read; 3517753ac610SCharles Manning loff_t chunk_start; 3518753ac610SCharles Manning struct yaffs_dev *dev; 35190e8cc8bdSWilliam Juul 3520753ac610SCharles Manning dev = in->my_dev; 35210e8cc8bdSWilliam Juul 3522753ac610SCharles Manning while (n > 0 && chunk_written >= 0) { 3523753ac610SCharles Manning yaffs_addr_to_chunk(dev, offset, &chunk, &start); 35240e8cc8bdSWilliam Juul 3525753ac610SCharles Manning if (((loff_t)chunk) * 3526753ac610SCharles Manning dev->data_bytes_per_chunk + start != offset || 3527753ac610SCharles Manning start >= dev->data_bytes_per_chunk) { 3528753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ERROR, 3529753ac610SCharles Manning "AddrToChunk of offset %lld gives chunk %d start %d", 3530753ac610SCharles Manning offset, chunk, start); 3531753ac610SCharles Manning } 3532753ac610SCharles Manning chunk++; /* File pos to chunk in file offset */ 35330e8cc8bdSWilliam Juul 35340e8cc8bdSWilliam Juul /* OK now check for the curveball where the start and end are in 35350e8cc8bdSWilliam Juul * the same chunk. 35360e8cc8bdSWilliam Juul */ 35370e8cc8bdSWilliam Juul 3538753ac610SCharles Manning if ((start + n) < dev->data_bytes_per_chunk) { 3539753ac610SCharles Manning n_copy = n; 35400e8cc8bdSWilliam Juul 3541753ac610SCharles Manning /* Now calculate how many bytes to write back.... 3542753ac610SCharles Manning * If we're overwriting and not writing to then end of 3543753ac610SCharles Manning * file then we need to write back as much as was there 3544753ac610SCharles Manning * before. 35450e8cc8bdSWilliam Juul */ 35460e8cc8bdSWilliam Juul 3547753ac610SCharles Manning chunk_start = (((loff_t)(chunk - 1)) * 3548753ac610SCharles Manning dev->data_bytes_per_chunk); 35490e8cc8bdSWilliam Juul 3550753ac610SCharles Manning if (chunk_start > in->variant.file_variant.file_size) 3551753ac610SCharles Manning n_bytes_read = 0; /* Past end of file */ 3552753ac610SCharles Manning else 3553753ac610SCharles Manning n_bytes_read = 3554753ac610SCharles Manning in->variant.file_variant.file_size - 3555753ac610SCharles Manning chunk_start; 35560e8cc8bdSWilliam Juul 3557753ac610SCharles Manning if (n_bytes_read > dev->data_bytes_per_chunk) 3558753ac610SCharles Manning n_bytes_read = dev->data_bytes_per_chunk; 3559753ac610SCharles Manning 3560753ac610SCharles Manning n_writeback = 3561753ac610SCharles Manning (n_bytes_read > 3562753ac610SCharles Manning (start + n)) ? n_bytes_read : (start + n); 3563753ac610SCharles Manning 3564753ac610SCharles Manning if (n_writeback < 0 || 3565753ac610SCharles Manning n_writeback > dev->data_bytes_per_chunk) 3566753ac610SCharles Manning BUG(); 35670e8cc8bdSWilliam Juul 35680e8cc8bdSWilliam Juul } else { 3569753ac610SCharles Manning n_copy = dev->data_bytes_per_chunk - start; 3570753ac610SCharles Manning n_writeback = dev->data_bytes_per_chunk; 35710e8cc8bdSWilliam Juul } 35720e8cc8bdSWilliam Juul 3573753ac610SCharles Manning if (n_copy != dev->data_bytes_per_chunk || 3574753ac610SCharles Manning dev->param.inband_tags) { 3575753ac610SCharles Manning /* An incomplete start or end chunk (or maybe both 3576753ac610SCharles Manning * start and end chunk), or we're using inband tags, 3577753ac610SCharles Manning * so we want to use the cache buffers. 3578753ac610SCharles Manning */ 3579753ac610SCharles Manning if (dev->param.n_caches > 0) { 3580753ac610SCharles Manning struct yaffs_cache *cache; 35810e8cc8bdSWilliam Juul 3582753ac610SCharles Manning /* If we can't find the data in the cache, then 3583753ac610SCharles Manning * load the cache */ 3584753ac610SCharles Manning cache = yaffs_find_chunk_cache(in, chunk); 3585753ac610SCharles Manning 3586753ac610SCharles Manning if (!cache && 3587753ac610SCharles Manning yaffs_check_alloc_available(dev, 1)) { 3588753ac610SCharles Manning cache = yaffs_grab_chunk_cache(dev); 35890e8cc8bdSWilliam Juul cache->object = in; 3590753ac610SCharles Manning cache->chunk_id = chunk; 35910e8cc8bdSWilliam Juul cache->dirty = 0; 35920e8cc8bdSWilliam Juul cache->locked = 0; 3593753ac610SCharles Manning yaffs_rd_data_obj(in, chunk, 3594753ac610SCharles Manning cache->data); 3595753ac610SCharles Manning } else if (cache && 35960e8cc8bdSWilliam Juul !cache->dirty && 3597753ac610SCharles Manning !yaffs_check_alloc_available(dev, 3598753ac610SCharles Manning 1)) { 3599753ac610SCharles Manning /* Drop the cache if it was a read cache 3600753ac610SCharles Manning * item and no space check has been made 3601753ac610SCharles Manning * for it. 36020e8cc8bdSWilliam Juul */ 36030e8cc8bdSWilliam Juul cache = NULL; 36040e8cc8bdSWilliam Juul } 36050e8cc8bdSWilliam Juul 36060e8cc8bdSWilliam Juul if (cache) { 3607753ac610SCharles Manning yaffs_use_cache(dev, cache, 1); 36080e8cc8bdSWilliam Juul cache->locked = 1; 36090e8cc8bdSWilliam Juul 36100e8cc8bdSWilliam Juul memcpy(&cache->data[start], buffer, 3611753ac610SCharles Manning n_copy); 36120e8cc8bdSWilliam Juul 36130e8cc8bdSWilliam Juul cache->locked = 0; 3614753ac610SCharles Manning cache->n_bytes = n_writeback; 36150e8cc8bdSWilliam Juul 3616753ac610SCharles Manning if (write_through) { 3617753ac610SCharles Manning chunk_written = 3618753ac610SCharles Manning yaffs_wr_data_obj 36190e8cc8bdSWilliam Juul (cache->object, 3620753ac610SCharles Manning cache->chunk_id, 3621753ac610SCharles Manning cache->data, 3622753ac610SCharles Manning cache->n_bytes, 1); 36230e8cc8bdSWilliam Juul cache->dirty = 0; 36240e8cc8bdSWilliam Juul } 36250e8cc8bdSWilliam Juul } else { 3626753ac610SCharles Manning chunk_written = -1; /* fail write */ 36270e8cc8bdSWilliam Juul } 36280e8cc8bdSWilliam Juul } else { 3629753ac610SCharles Manning /* An incomplete start or end chunk (or maybe 3630753ac610SCharles Manning * both start and end chunk). Read into the 3631753ac610SCharles Manning * local buffer then copy over and write back. 36320e8cc8bdSWilliam Juul */ 36330e8cc8bdSWilliam Juul 3634753ac610SCharles Manning u8 *local_buffer = yaffs_get_temp_buffer(dev); 36350e8cc8bdSWilliam Juul 3636753ac610SCharles Manning yaffs_rd_data_obj(in, chunk, local_buffer); 3637753ac610SCharles Manning memcpy(&local_buffer[start], buffer, n_copy); 36380e8cc8bdSWilliam Juul 3639753ac610SCharles Manning chunk_written = 3640753ac610SCharles Manning yaffs_wr_data_obj(in, chunk, 3641753ac610SCharles Manning local_buffer, 3642753ac610SCharles Manning n_writeback, 0); 36430e8cc8bdSWilliam Juul 3644753ac610SCharles Manning yaffs_release_temp_buffer(dev, local_buffer); 36450e8cc8bdSWilliam Juul } 36460e8cc8bdSWilliam Juul } else { 3647753ac610SCharles Manning /* A full chunk. Write directly from the buffer. */ 36480e8cc8bdSWilliam Juul 3649753ac610SCharles Manning chunk_written = 3650753ac610SCharles Manning yaffs_wr_data_obj(in, chunk, buffer, 3651753ac610SCharles Manning dev->data_bytes_per_chunk, 0); 3652753ac610SCharles Manning 3653753ac610SCharles Manning /* Since we've overwritten the cached data, 3654753ac610SCharles Manning * we better invalidate it. */ 3655753ac610SCharles Manning yaffs_invalidate_chunk_cache(in, chunk); 36560e8cc8bdSWilliam Juul } 36570e8cc8bdSWilliam Juul 3658753ac610SCharles Manning if (chunk_written >= 0) { 3659753ac610SCharles Manning n -= n_copy; 3660753ac610SCharles Manning offset += n_copy; 3661753ac610SCharles Manning buffer += n_copy; 3662753ac610SCharles Manning n_done += n_copy; 36630e8cc8bdSWilliam Juul } 36640e8cc8bdSWilliam Juul } 36650e8cc8bdSWilliam Juul 36660e8cc8bdSWilliam Juul /* Update file object */ 36670e8cc8bdSWilliam Juul 3668753ac610SCharles Manning if ((start_write + n_done) > in->variant.file_variant.file_size) 3669753ac610SCharles Manning in->variant.file_variant.file_size = (start_write + n_done); 36700e8cc8bdSWilliam Juul 36710e8cc8bdSWilliam Juul in->dirty = 1; 3672753ac610SCharles Manning return n_done; 36730e8cc8bdSWilliam Juul } 36740e8cc8bdSWilliam Juul 3675753ac610SCharles Manning int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset, 3676753ac610SCharles Manning int n_bytes, int write_through) 3677753ac610SCharles Manning { 3678753ac610SCharles Manning yaffs2_handle_hole(in, offset); 3679753ac610SCharles Manning return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through); 3680753ac610SCharles Manning } 36810e8cc8bdSWilliam Juul 36820e8cc8bdSWilliam Juul /* ---------------------- File resizing stuff ------------------ */ 36830e8cc8bdSWilliam Juul 3684753ac610SCharles Manning static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size) 36850e8cc8bdSWilliam Juul { 36860e8cc8bdSWilliam Juul 3687753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev; 3688753ac610SCharles Manning loff_t old_size = in->variant.file_variant.file_size; 36890e8cc8bdSWilliam Juul int i; 3690753ac610SCharles Manning int chunk_id; 3691753ac610SCharles Manning u32 dummy; 3692753ac610SCharles Manning int last_del; 3693753ac610SCharles Manning int start_del; 3694753ac610SCharles Manning 3695753ac610SCharles Manning if (old_size > 0) 3696753ac610SCharles Manning yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy); 3697753ac610SCharles Manning else 3698753ac610SCharles Manning last_del = 0; 3699753ac610SCharles Manning 3700753ac610SCharles Manning yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1, 3701753ac610SCharles Manning &start_del, &dummy); 3702753ac610SCharles Manning last_del++; 3703753ac610SCharles Manning start_del++; 37040e8cc8bdSWilliam Juul 37050e8cc8bdSWilliam Juul /* Delete backwards so that we don't end up with holes if 37060e8cc8bdSWilliam Juul * power is lost part-way through the operation. 37070e8cc8bdSWilliam Juul */ 3708753ac610SCharles Manning for (i = last_del; i >= start_del; i--) { 37090e8cc8bdSWilliam Juul /* NB this could be optimised somewhat, 37100e8cc8bdSWilliam Juul * eg. could retrieve the tags and write them without 3711753ac610SCharles Manning * using yaffs_chunk_del 37120e8cc8bdSWilliam Juul */ 37130e8cc8bdSWilliam Juul 3714753ac610SCharles Manning chunk_id = yaffs_find_del_file_chunk(in, i, NULL); 3715753ac610SCharles Manning 3716753ac610SCharles Manning if (chunk_id < 1) 3717753ac610SCharles Manning continue; 3718753ac610SCharles Manning 3719753ac610SCharles Manning if (chunk_id < 3720753ac610SCharles Manning (dev->internal_start_block * dev->param.chunks_per_block) || 3721753ac610SCharles Manning chunk_id >= 3722753ac610SCharles Manning ((dev->internal_end_block + 1) * 3723753ac610SCharles Manning dev->param.chunks_per_block)) { 3724753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 3725753ac610SCharles Manning "Found daft chunk_id %d for %d", 3726753ac610SCharles Manning chunk_id, i); 37270e8cc8bdSWilliam Juul } else { 3728753ac610SCharles Manning in->n_data_chunks--; 3729753ac610SCharles Manning yaffs_chunk_del(dev, chunk_id, 1, __LINE__); 37300e8cc8bdSWilliam Juul } 37310e8cc8bdSWilliam Juul } 37320e8cc8bdSWilliam Juul } 37330e8cc8bdSWilliam Juul 3734753ac610SCharles Manning void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size) 37350e8cc8bdSWilliam Juul { 3736753ac610SCharles Manning int new_full; 3737753ac610SCharles Manning u32 new_partial; 3738753ac610SCharles Manning struct yaffs_dev *dev = obj->my_dev; 37390e8cc8bdSWilliam Juul 3740753ac610SCharles Manning yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial); 37410e8cc8bdSWilliam Juul 3742753ac610SCharles Manning yaffs_prune_chunks(obj, new_size); 37430e8cc8bdSWilliam Juul 3744753ac610SCharles Manning if (new_partial != 0) { 3745753ac610SCharles Manning int last_chunk = 1 + new_full; 3746753ac610SCharles Manning u8 *local_buffer = yaffs_get_temp_buffer(dev); 37470e8cc8bdSWilliam Juul 3748753ac610SCharles Manning /* Rewrite the last chunk with its new size and zero pad */ 3749753ac610SCharles Manning yaffs_rd_data_obj(obj, last_chunk, local_buffer); 3750753ac610SCharles Manning memset(local_buffer + new_partial, 0, 3751753ac610SCharles Manning dev->data_bytes_per_chunk - new_partial); 37520e8cc8bdSWilliam Juul 3753753ac610SCharles Manning yaffs_wr_data_obj(obj, last_chunk, local_buffer, 3754753ac610SCharles Manning new_partial, 1); 37550e8cc8bdSWilliam Juul 3756753ac610SCharles Manning yaffs_release_temp_buffer(dev, local_buffer); 37570e8cc8bdSWilliam Juul } 37580e8cc8bdSWilliam Juul 3759753ac610SCharles Manning obj->variant.file_variant.file_size = new_size; 3760753ac610SCharles Manning 3761753ac610SCharles Manning yaffs_prune_tree(dev, &obj->variant.file_variant); 37620e8cc8bdSWilliam Juul } 37630e8cc8bdSWilliam Juul 3764753ac610SCharles Manning int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size) 3765753ac610SCharles Manning { 3766753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev; 3767753ac610SCharles Manning loff_t old_size = in->variant.file_variant.file_size; 37680e8cc8bdSWilliam Juul 3769753ac610SCharles Manning yaffs_flush_file_cache(in); 3770753ac610SCharles Manning yaffs_invalidate_whole_cache(in); 37710e8cc8bdSWilliam Juul 3772753ac610SCharles Manning yaffs_check_gc(dev, 0); 37730e8cc8bdSWilliam Juul 3774753ac610SCharles Manning if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) 3775753ac610SCharles Manning return YAFFS_FAIL; 37760e8cc8bdSWilliam Juul 3777753ac610SCharles Manning if (new_size == old_size) 3778753ac610SCharles Manning return YAFFS_OK; 37790e8cc8bdSWilliam Juul 3780753ac610SCharles Manning if (new_size > old_size) { 3781753ac610SCharles Manning yaffs2_handle_hole(in, new_size); 3782753ac610SCharles Manning in->variant.file_variant.file_size = new_size; 37830e8cc8bdSWilliam Juul } else { 3784753ac610SCharles Manning /* new_size < old_size */ 3785753ac610SCharles Manning yaffs_resize_file_down(in, new_size); 37860e8cc8bdSWilliam Juul } 37870e8cc8bdSWilliam Juul 3788753ac610SCharles Manning /* Write a new object header to reflect the resize. 37890e8cc8bdSWilliam Juul * show we've shrunk the file, if need be 3790753ac610SCharles Manning * Do this only if the file is not in the deleted directories 3791753ac610SCharles Manning * and is not shadowed. 37920e8cc8bdSWilliam Juul */ 3793753ac610SCharles Manning if (in->parent && 3794753ac610SCharles Manning !in->is_shadowed && 3795753ac610SCharles Manning in->parent->obj_id != YAFFS_OBJECTID_UNLINKED && 3796753ac610SCharles Manning in->parent->obj_id != YAFFS_OBJECTID_DELETED) 3797753ac610SCharles Manning yaffs_update_oh(in, NULL, 0, 0, 0, NULL); 37980e8cc8bdSWilliam Juul 37990e8cc8bdSWilliam Juul return YAFFS_OK; 38000e8cc8bdSWilliam Juul } 38010e8cc8bdSWilliam Juul 3802753ac610SCharles Manning int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync) 38030e8cc8bdSWilliam Juul { 3804753ac610SCharles Manning if (!in->dirty) 38050e8cc8bdSWilliam Juul return YAFFS_OK; 38060e8cc8bdSWilliam Juul 3807753ac610SCharles Manning yaffs_flush_file_cache(in); 3808753ac610SCharles Manning 3809753ac610SCharles Manning if (data_sync) 3810753ac610SCharles Manning return YAFFS_OK; 3811753ac610SCharles Manning 3812753ac610SCharles Manning if (update_time) 3813753ac610SCharles Manning yaffs_load_current_time(in, 0, 0); 3814753ac610SCharles Manning 3815753ac610SCharles Manning return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ? 3816753ac610SCharles Manning YAFFS_OK : YAFFS_FAIL; 38170e8cc8bdSWilliam Juul } 38180e8cc8bdSWilliam Juul 3819753ac610SCharles Manning 3820753ac610SCharles Manning /* yaffs_del_file deletes the whole file data 38210e8cc8bdSWilliam Juul * and the inode associated with the file. 38220e8cc8bdSWilliam Juul * It does not delete the links associated with the file. 38230e8cc8bdSWilliam Juul */ 3824753ac610SCharles Manning static int yaffs_unlink_file_if_needed(struct yaffs_obj *in) 38250e8cc8bdSWilliam Juul { 3826753ac610SCharles Manning int ret_val; 3827753ac610SCharles Manning int del_now = 0; 3828753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev; 38290e8cc8bdSWilliam Juul 3830753ac610SCharles Manning if (!in->my_inode) 3831753ac610SCharles Manning del_now = 1; 38320e8cc8bdSWilliam Juul 3833753ac610SCharles Manning if (del_now) { 3834753ac610SCharles Manning ret_val = 3835753ac610SCharles Manning yaffs_change_obj_name(in, in->my_dev->del_dir, 3836753ac610SCharles Manning _Y("deleted"), 0, 0); 3837753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING, 3838753ac610SCharles Manning "yaffs: immediate deletion of file %d", 3839753ac610SCharles Manning in->obj_id); 38400e8cc8bdSWilliam Juul in->deleted = 1; 3841753ac610SCharles Manning in->my_dev->n_deleted_files++; 3842753ac610SCharles Manning if (dev->param.disable_soft_del || dev->param.is_yaffs2) 3843753ac610SCharles Manning yaffs_resize_file(in, 0); 3844753ac610SCharles Manning yaffs_soft_del_file(in); 38450e8cc8bdSWilliam Juul } else { 3846753ac610SCharles Manning ret_val = 3847753ac610SCharles Manning yaffs_change_obj_name(in, in->my_dev->unlinked_dir, 3848753ac610SCharles Manning _Y("unlinked"), 0, 0); 3849753ac610SCharles Manning } 3850753ac610SCharles Manning return ret_val; 38510e8cc8bdSWilliam Juul } 38520e8cc8bdSWilliam Juul 3853753ac610SCharles Manning int yaffs_del_file(struct yaffs_obj *in) 38540e8cc8bdSWilliam Juul { 3855753ac610SCharles Manning int ret_val = YAFFS_OK; 3856753ac610SCharles Manning int deleted; /* Need to cache value on stack if in is freed */ 3857753ac610SCharles Manning struct yaffs_dev *dev = in->my_dev; 38580e8cc8bdSWilliam Juul 3859753ac610SCharles Manning if (dev->param.disable_soft_del || dev->param.is_yaffs2) 3860753ac610SCharles Manning yaffs_resize_file(in, 0); 3861753ac610SCharles Manning 3862753ac610SCharles Manning if (in->n_data_chunks > 0) { 3863753ac610SCharles Manning /* Use soft deletion if there is data in the file. 3864753ac610SCharles Manning * That won't be the case if it has been resized to zero. 3865753ac610SCharles Manning */ 3866753ac610SCharles Manning if (!in->unlinked) 3867753ac610SCharles Manning ret_val = yaffs_unlink_file_if_needed(in); 3868753ac610SCharles Manning 3869753ac610SCharles Manning deleted = in->deleted; 3870753ac610SCharles Manning 3871753ac610SCharles Manning if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) { 38720e8cc8bdSWilliam Juul in->deleted = 1; 3873753ac610SCharles Manning deleted = 1; 3874753ac610SCharles Manning in->my_dev->n_deleted_files++; 3875753ac610SCharles Manning yaffs_soft_del_file(in); 38760e8cc8bdSWilliam Juul } 3877753ac610SCharles Manning return deleted ? YAFFS_OK : YAFFS_FAIL; 38780e8cc8bdSWilliam Juul } else { 38790e8cc8bdSWilliam Juul /* The file has no data chunks so we toss it immediately */ 3880753ac610SCharles Manning yaffs_free_tnode(in->my_dev, in->variant.file_variant.top); 3881753ac610SCharles Manning in->variant.file_variant.top = NULL; 3882753ac610SCharles Manning yaffs_generic_obj_del(in); 38830e8cc8bdSWilliam Juul 38840e8cc8bdSWilliam Juul return YAFFS_OK; 38850e8cc8bdSWilliam Juul } 38860e8cc8bdSWilliam Juul } 38870e8cc8bdSWilliam Juul 3888753ac610SCharles Manning int yaffs_is_non_empty_dir(struct yaffs_obj *obj) 3889753ac610SCharles Manning { 3890753ac610SCharles Manning return (obj && 3891753ac610SCharles Manning obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) && 3892753ac610SCharles Manning !(list_empty(&obj->variant.dir_variant.children)); 3893753ac610SCharles Manning } 3894753ac610SCharles Manning 3895753ac610SCharles Manning static int yaffs_del_dir(struct yaffs_obj *obj) 38960e8cc8bdSWilliam Juul { 38970e8cc8bdSWilliam Juul /* First check that the directory is empty. */ 3898753ac610SCharles Manning if (yaffs_is_non_empty_dir(obj)) 38990e8cc8bdSWilliam Juul return YAFFS_FAIL; 39000e8cc8bdSWilliam Juul 3901753ac610SCharles Manning return yaffs_generic_obj_del(obj); 39020e8cc8bdSWilliam Juul } 39030e8cc8bdSWilliam Juul 3904753ac610SCharles Manning static int yaffs_del_symlink(struct yaffs_obj *in) 39050e8cc8bdSWilliam Juul { 3906753ac610SCharles Manning kfree(in->variant.symlink_variant.alias); 3907753ac610SCharles Manning in->variant.symlink_variant.alias = NULL; 39080e8cc8bdSWilliam Juul 3909753ac610SCharles Manning return yaffs_generic_obj_del(in); 39100e8cc8bdSWilliam Juul } 39110e8cc8bdSWilliam Juul 3912753ac610SCharles Manning static int yaffs_del_link(struct yaffs_obj *in) 39130e8cc8bdSWilliam Juul { 3914753ac610SCharles Manning /* remove this hardlink from the list associated with the equivalent 39150e8cc8bdSWilliam Juul * object 39160e8cc8bdSWilliam Juul */ 3917753ac610SCharles Manning list_del_init(&in->hard_links); 3918753ac610SCharles Manning return yaffs_generic_obj_del(in); 39190e8cc8bdSWilliam Juul } 39200e8cc8bdSWilliam Juul 3921753ac610SCharles Manning int yaffs_del_obj(struct yaffs_obj *obj) 39220e8cc8bdSWilliam Juul { 3923753ac610SCharles Manning int ret_val = -1; 3924753ac610SCharles Manning 3925753ac610SCharles Manning switch (obj->variant_type) { 39260e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_FILE: 3927753ac610SCharles Manning ret_val = yaffs_del_file(obj); 39280e8cc8bdSWilliam Juul break; 39290e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_DIRECTORY: 3930753ac610SCharles Manning if (!list_empty(&obj->variant.dir_variant.dirty)) { 3931753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_BACKGROUND, 3932753ac610SCharles Manning "Remove object %d from dirty directories", 3933753ac610SCharles Manning obj->obj_id); 3934753ac610SCharles Manning list_del_init(&obj->variant.dir_variant.dirty); 3935753ac610SCharles Manning } 3936753ac610SCharles Manning return yaffs_del_dir(obj); 39370e8cc8bdSWilliam Juul break; 39380e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SYMLINK: 3939753ac610SCharles Manning ret_val = yaffs_del_symlink(obj); 39400e8cc8bdSWilliam Juul break; 39410e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_HARDLINK: 3942753ac610SCharles Manning ret_val = yaffs_del_link(obj); 39430e8cc8bdSWilliam Juul break; 39440e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SPECIAL: 3945753ac610SCharles Manning ret_val = yaffs_generic_obj_del(obj); 39460e8cc8bdSWilliam Juul break; 39470e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_UNKNOWN: 3948753ac610SCharles Manning ret_val = 0; 39490e8cc8bdSWilliam Juul break; /* should not happen. */ 39500e8cc8bdSWilliam Juul } 3951753ac610SCharles Manning return ret_val; 39520e8cc8bdSWilliam Juul } 39530e8cc8bdSWilliam Juul 3954753ac610SCharles Manning static int yaffs_unlink_worker(struct yaffs_obj *obj) 39550e8cc8bdSWilliam Juul { 3956753ac610SCharles Manning int del_now = 0; 39570e8cc8bdSWilliam Juul 3958753ac610SCharles Manning if (!obj) 3959753ac610SCharles Manning return YAFFS_FAIL; 3960753ac610SCharles Manning 3961753ac610SCharles Manning if (!obj->my_inode) 3962753ac610SCharles Manning del_now = 1; 3963753ac610SCharles Manning 3964753ac610SCharles Manning yaffs_update_parent(obj->parent); 3965753ac610SCharles Manning 3966753ac610SCharles Manning if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) { 3967753ac610SCharles Manning return yaffs_del_link(obj); 3968753ac610SCharles Manning } else if (!list_empty(&obj->hard_links)) { 39690e8cc8bdSWilliam Juul /* Curve ball: We're unlinking an object that has a hardlink. 39700e8cc8bdSWilliam Juul * 39710e8cc8bdSWilliam Juul * This problem arises because we are not strictly following 39720e8cc8bdSWilliam Juul * The Linux link/inode model. 39730e8cc8bdSWilliam Juul * 39740e8cc8bdSWilliam Juul * We can't really delete the object. 39750e8cc8bdSWilliam Juul * Instead, we do the following: 39760e8cc8bdSWilliam Juul * - Select a hardlink. 39770e8cc8bdSWilliam Juul * - Unhook it from the hard links 3978753ac610SCharles Manning * - Move it from its parent directory so that the rename works. 39790e8cc8bdSWilliam Juul * - Rename the object to the hardlink's name. 39800e8cc8bdSWilliam Juul * - Delete the hardlink 39810e8cc8bdSWilliam Juul */ 39820e8cc8bdSWilliam Juul 3983753ac610SCharles Manning struct yaffs_obj *hl; 3984753ac610SCharles Manning struct yaffs_obj *parent; 3985753ac610SCharles Manning int ret_val; 39860e8cc8bdSWilliam Juul YCHAR name[YAFFS_MAX_NAME_LENGTH + 1]; 39870e8cc8bdSWilliam Juul 3988753ac610SCharles Manning hl = list_entry(obj->hard_links.next, struct yaffs_obj, 3989753ac610SCharles Manning hard_links); 39900e8cc8bdSWilliam Juul 3991753ac610SCharles Manning yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1); 3992753ac610SCharles Manning parent = hl->parent; 39930e8cc8bdSWilliam Juul 3994753ac610SCharles Manning list_del_init(&hl->hard_links); 39950e8cc8bdSWilliam Juul 3996753ac610SCharles Manning yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl); 39970e8cc8bdSWilliam Juul 3998753ac610SCharles Manning ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0); 39990e8cc8bdSWilliam Juul 4000753ac610SCharles Manning if (ret_val == YAFFS_OK) 4001753ac610SCharles Manning ret_val = yaffs_generic_obj_del(hl); 4002753ac610SCharles Manning 4003753ac610SCharles Manning return ret_val; 4004753ac610SCharles Manning 4005753ac610SCharles Manning } else if (del_now) { 4006753ac610SCharles Manning switch (obj->variant_type) { 40070e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_FILE: 4008753ac610SCharles Manning return yaffs_del_file(obj); 40090e8cc8bdSWilliam Juul break; 40100e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_DIRECTORY: 4011753ac610SCharles Manning list_del_init(&obj->variant.dir_variant.dirty); 4012753ac610SCharles Manning return yaffs_del_dir(obj); 40130e8cc8bdSWilliam Juul break; 40140e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SYMLINK: 4015753ac610SCharles Manning return yaffs_del_symlink(obj); 40160e8cc8bdSWilliam Juul break; 40170e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SPECIAL: 4018753ac610SCharles Manning return yaffs_generic_obj_del(obj); 40190e8cc8bdSWilliam Juul break; 40200e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_HARDLINK: 40210e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_UNKNOWN: 40220e8cc8bdSWilliam Juul default: 40230e8cc8bdSWilliam Juul return YAFFS_FAIL; 40240e8cc8bdSWilliam Juul } 4025753ac610SCharles Manning } else if (yaffs_is_non_empty_dir(obj)) { 4026753ac610SCharles Manning return YAFFS_FAIL; 4027753ac610SCharles Manning } else { 4028753ac610SCharles Manning return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir, 4029753ac610SCharles Manning _Y("unlinked"), 0, 0); 40300e8cc8bdSWilliam Juul } 40310e8cc8bdSWilliam Juul } 40320e8cc8bdSWilliam Juul 4033753ac610SCharles Manning static int yaffs_unlink_obj(struct yaffs_obj *obj) 40340e8cc8bdSWilliam Juul { 4035753ac610SCharles Manning if (obj && obj->unlink_allowed) 4036753ac610SCharles Manning return yaffs_unlink_worker(obj); 40370e8cc8bdSWilliam Juul 40380e8cc8bdSWilliam Juul return YAFFS_FAIL; 40390e8cc8bdSWilliam Juul } 40400e8cc8bdSWilliam Juul 4041753ac610SCharles Manning int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name) 4042753ac610SCharles Manning { 4043753ac610SCharles Manning struct yaffs_obj *obj; 4044753ac610SCharles Manning 4045753ac610SCharles Manning obj = yaffs_find_by_name(dir, name); 4046753ac610SCharles Manning return yaffs_unlink_obj(obj); 4047753ac610SCharles Manning } 4048753ac610SCharles Manning 4049753ac610SCharles Manning /* Note: 4050753ac610SCharles Manning * If old_name is NULL then we take old_dir as the object to be renamed. 4051753ac610SCharles Manning */ 4052753ac610SCharles Manning int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name, 4053753ac610SCharles Manning struct yaffs_obj *new_dir, const YCHAR *new_name) 4054753ac610SCharles Manning { 4055753ac610SCharles Manning struct yaffs_obj *obj = NULL; 4056753ac610SCharles Manning struct yaffs_obj *existing_target = NULL; 4057753ac610SCharles Manning int force = 0; 4058753ac610SCharles Manning int result; 4059753ac610SCharles Manning struct yaffs_dev *dev; 4060753ac610SCharles Manning 4061753ac610SCharles Manning if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { 4062753ac610SCharles Manning BUG(); 4063753ac610SCharles Manning return YAFFS_FAIL; 4064753ac610SCharles Manning } 4065753ac610SCharles Manning if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { 4066753ac610SCharles Manning BUG(); 4067753ac610SCharles Manning return YAFFS_FAIL; 4068753ac610SCharles Manning } 4069753ac610SCharles Manning 4070753ac610SCharles Manning dev = old_dir->my_dev; 4071753ac610SCharles Manning 4072753ac610SCharles Manning #ifdef CONFIG_YAFFS_CASE_INSENSITIVE 4073753ac610SCharles Manning /* Special case for case insemsitive systems. 4074753ac610SCharles Manning * While look-up is case insensitive, the name isn't. 4075753ac610SCharles Manning * Therefore we might want to change x.txt to X.txt 4076753ac610SCharles Manning */ 4077753ac610SCharles Manning if (old_dir == new_dir && 4078753ac610SCharles Manning old_name && new_name && 4079753ac610SCharles Manning yaffs_strcmp(old_name, new_name) == 0) 4080753ac610SCharles Manning force = 1; 4081753ac610SCharles Manning #endif 4082753ac610SCharles Manning 4083753ac610SCharles Manning if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) > 4084753ac610SCharles Manning YAFFS_MAX_NAME_LENGTH) 4085753ac610SCharles Manning /* ENAMETOOLONG */ 4086753ac610SCharles Manning return YAFFS_FAIL; 4087753ac610SCharles Manning 4088753ac610SCharles Manning if (old_name) 4089753ac610SCharles Manning obj = yaffs_find_by_name(old_dir, old_name); 4090753ac610SCharles Manning else{ 4091753ac610SCharles Manning obj = old_dir; 4092753ac610SCharles Manning old_dir = obj->parent; 4093753ac610SCharles Manning } 4094753ac610SCharles Manning 4095753ac610SCharles Manning if (obj && obj->rename_allowed) { 4096753ac610SCharles Manning /* Now handle an existing target, if there is one */ 4097753ac610SCharles Manning existing_target = yaffs_find_by_name(new_dir, new_name); 4098753ac610SCharles Manning if (yaffs_is_non_empty_dir(existing_target)) { 4099753ac610SCharles Manning return YAFFS_FAIL; /* ENOTEMPTY */ 4100753ac610SCharles Manning } else if (existing_target && existing_target != obj) { 4101753ac610SCharles Manning /* Nuke the target first, using shadowing, 4102753ac610SCharles Manning * but only if it isn't the same object. 4103753ac610SCharles Manning * 4104753ac610SCharles Manning * Note we must disable gc here otherwise it can mess 4105753ac610SCharles Manning * up the shadowing. 4106753ac610SCharles Manning * 4107753ac610SCharles Manning */ 4108753ac610SCharles Manning dev->gc_disable = 1; 4109753ac610SCharles Manning yaffs_change_obj_name(obj, new_dir, new_name, force, 4110753ac610SCharles Manning existing_target->obj_id); 4111753ac610SCharles Manning existing_target->is_shadowed = 1; 4112753ac610SCharles Manning yaffs_unlink_obj(existing_target); 4113753ac610SCharles Manning dev->gc_disable = 0; 4114753ac610SCharles Manning } 4115753ac610SCharles Manning 4116753ac610SCharles Manning result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0); 4117753ac610SCharles Manning 4118753ac610SCharles Manning yaffs_update_parent(old_dir); 4119753ac610SCharles Manning if (new_dir != old_dir) 4120753ac610SCharles Manning yaffs_update_parent(new_dir); 4121753ac610SCharles Manning 4122753ac610SCharles Manning return result; 4123753ac610SCharles Manning } 4124753ac610SCharles Manning return YAFFS_FAIL; 41250e8cc8bdSWilliam Juul } 41260e8cc8bdSWilliam Juul 41270e8cc8bdSWilliam Juul /*----------------------- Initialisation Scanning ---------------------- */ 41280e8cc8bdSWilliam Juul 4129753ac610SCharles Manning void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id, 4130753ac610SCharles Manning int backward_scanning) 41310e8cc8bdSWilliam Juul { 4132753ac610SCharles Manning struct yaffs_obj *obj; 41330e8cc8bdSWilliam Juul 4134753ac610SCharles Manning if (backward_scanning) { 41350e8cc8bdSWilliam Juul /* Handle YAFFS2 case (backward scanning) 41360e8cc8bdSWilliam Juul * If the shadowed object exists then ignore. 41370e8cc8bdSWilliam Juul */ 4138753ac610SCharles Manning obj = yaffs_find_by_number(dev, obj_id); 4139753ac610SCharles Manning if (obj) 41400e8cc8bdSWilliam Juul return; 41410e8cc8bdSWilliam Juul } 41420e8cc8bdSWilliam Juul 4143753ac610SCharles Manning /* Let's create it (if it does not exist) assuming it is a file so that 4144753ac610SCharles Manning * it can do shrinking etc. 41450e8cc8bdSWilliam Juul * We put it in unlinked dir to be cleaned up after the scanning 41460e8cc8bdSWilliam Juul */ 41470e8cc8bdSWilliam Juul obj = 4148753ac610SCharles Manning yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE); 4149753ac610SCharles Manning if (!obj) 4150753ac610SCharles Manning return; 4151753ac610SCharles Manning obj->is_shadowed = 1; 4152753ac610SCharles Manning yaffs_add_obj_to_dir(dev->unlinked_dir, obj); 4153753ac610SCharles Manning obj->variant.file_variant.shrink_size = 0; 4154753ac610SCharles Manning obj->valid = 1; /* So that we don't read any other info. */ 41550e8cc8bdSWilliam Juul } 41560e8cc8bdSWilliam Juul 4157753ac610SCharles Manning void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list) 41580e8cc8bdSWilliam Juul { 4159753ac610SCharles Manning struct list_head *lh; 4160753ac610SCharles Manning struct list_head *save; 4161753ac610SCharles Manning struct yaffs_obj *hl; 4162753ac610SCharles Manning struct yaffs_obj *in; 41630e8cc8bdSWilliam Juul 4164753ac610SCharles Manning list_for_each_safe(lh, save, hard_list) { 4165753ac610SCharles Manning hl = list_entry(lh, struct yaffs_obj, hard_links); 4166753ac610SCharles Manning in = yaffs_find_by_number(dev, 4167753ac610SCharles Manning hl->variant.hardlink_variant.equiv_id); 41680e8cc8bdSWilliam Juul 41690e8cc8bdSWilliam Juul if (in) { 41700e8cc8bdSWilliam Juul /* Add the hardlink pointers */ 4171753ac610SCharles Manning hl->variant.hardlink_variant.equiv_obj = in; 4172753ac610SCharles Manning list_add(&hl->hard_links, &in->hard_links); 41730e8cc8bdSWilliam Juul } else { 41740e8cc8bdSWilliam Juul /* Todo Need to report/handle this better. 41750e8cc8bdSWilliam Juul * Got a problem... hardlink to a non-existant object 41760e8cc8bdSWilliam Juul */ 4177753ac610SCharles Manning hl->variant.hardlink_variant.equiv_obj = NULL; 4178753ac610SCharles Manning INIT_LIST_HEAD(&hl->hard_links); 4179753ac610SCharles Manning } 4180753ac610SCharles Manning } 41810e8cc8bdSWilliam Juul } 41820e8cc8bdSWilliam Juul 4183753ac610SCharles Manning static void yaffs_strip_deleted_objs(struct yaffs_dev *dev) 41840e8cc8bdSWilliam Juul { 4185753ac610SCharles Manning /* 4186753ac610SCharles Manning * Sort out state of unlinked and deleted objects after scanning. 41870e8cc8bdSWilliam Juul */ 41880e8cc8bdSWilliam Juul struct list_head *i; 41890e8cc8bdSWilliam Juul struct list_head *n; 4190753ac610SCharles Manning struct yaffs_obj *l; 41910e8cc8bdSWilliam Juul 4192753ac610SCharles Manning if (dev->read_only) 41930e8cc8bdSWilliam Juul return; 41940e8cc8bdSWilliam Juul 41950e8cc8bdSWilliam Juul /* Soft delete all the unlinked files */ 41960e8cc8bdSWilliam Juul list_for_each_safe(i, n, 4197753ac610SCharles Manning &dev->unlinked_dir->variant.dir_variant.children) { 4198753ac610SCharles Manning l = list_entry(i, struct yaffs_obj, siblings); 4199753ac610SCharles Manning yaffs_del_obj(l); 4200753ac610SCharles Manning } 4201753ac610SCharles Manning 4202753ac610SCharles Manning list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) { 4203753ac610SCharles Manning l = list_entry(i, struct yaffs_obj, siblings); 4204753ac610SCharles Manning yaffs_del_obj(l); 42050e8cc8bdSWilliam Juul } 42060e8cc8bdSWilliam Juul } 42070e8cc8bdSWilliam Juul 4208753ac610SCharles Manning /* 4209753ac610SCharles Manning * This code iterates through all the objects making sure that they are rooted. 4210753ac610SCharles Manning * Any unrooted objects are re-rooted in lost+found. 4211753ac610SCharles Manning * An object needs to be in one of: 4212753ac610SCharles Manning * - Directly under deleted, unlinked 4213753ac610SCharles Manning * - Directly or indirectly under root. 4214753ac610SCharles Manning * 4215753ac610SCharles Manning * Note: 4216753ac610SCharles Manning * This code assumes that we don't ever change the current relationships 4217753ac610SCharles Manning * between directories: 4218753ac610SCharles Manning * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL 4219753ac610SCharles Manning * lost-n-found->parent == root_dir 4220753ac610SCharles Manning * 4221753ac610SCharles Manning * This fixes the problem where directories might have inadvertently been 4222753ac610SCharles Manning * deleted leaving the object "hanging" without being rooted in the 4223753ac610SCharles Manning * directory tree. 4224753ac610SCharles Manning */ 42250e8cc8bdSWilliam Juul 4226753ac610SCharles Manning static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj) 42270e8cc8bdSWilliam Juul { 4228753ac610SCharles Manning return (obj == dev->del_dir || 4229753ac610SCharles Manning obj == dev->unlinked_dir || obj == dev->root_dir); 42300e8cc8bdSWilliam Juul } 42310e8cc8bdSWilliam Juul 4232753ac610SCharles Manning static void yaffs_fix_hanging_objs(struct yaffs_dev *dev) 42330e8cc8bdSWilliam Juul { 4234753ac610SCharles Manning struct yaffs_obj *obj; 4235753ac610SCharles Manning struct yaffs_obj *parent; 4236753ac610SCharles Manning int i; 4237753ac610SCharles Manning struct list_head *lh; 4238753ac610SCharles Manning struct list_head *n; 4239753ac610SCharles Manning int depth_limit; 4240753ac610SCharles Manning int hanging; 42410e8cc8bdSWilliam Juul 4242753ac610SCharles Manning if (dev->read_only) 4243753ac610SCharles Manning return; 4244753ac610SCharles Manning 4245753ac610SCharles Manning /* Iterate through the objects in each hash entry, 4246753ac610SCharles Manning * looking at each object. 4247753ac610SCharles Manning * Make sure it is rooted. 4248753ac610SCharles Manning */ 4249753ac610SCharles Manning 4250753ac610SCharles Manning for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { 4251753ac610SCharles Manning list_for_each_safe(lh, n, &dev->obj_bucket[i].list) { 4252753ac610SCharles Manning obj = list_entry(lh, struct yaffs_obj, hash_link); 4253753ac610SCharles Manning parent = obj->parent; 4254753ac610SCharles Manning 4255753ac610SCharles Manning if (yaffs_has_null_parent(dev, obj)) { 4256753ac610SCharles Manning /* These directories are not hanging */ 4257753ac610SCharles Manning hanging = 0; 4258753ac610SCharles Manning } else if (!parent || 4259753ac610SCharles Manning parent->variant_type != 4260753ac610SCharles Manning YAFFS_OBJECT_TYPE_DIRECTORY) { 4261753ac610SCharles Manning hanging = 1; 4262753ac610SCharles Manning } else if (yaffs_has_null_parent(dev, parent)) { 4263753ac610SCharles Manning hanging = 0; 4264753ac610SCharles Manning } else { 4265753ac610SCharles Manning /* 4266753ac610SCharles Manning * Need to follow the parent chain to 4267753ac610SCharles Manning * see if it is hanging. 4268753ac610SCharles Manning */ 4269753ac610SCharles Manning hanging = 0; 4270753ac610SCharles Manning depth_limit = 100; 4271753ac610SCharles Manning 4272753ac610SCharles Manning while (parent != dev->root_dir && 4273753ac610SCharles Manning parent->parent && 4274753ac610SCharles Manning parent->parent->variant_type == 4275753ac610SCharles Manning YAFFS_OBJECT_TYPE_DIRECTORY && 4276753ac610SCharles Manning depth_limit > 0) { 4277753ac610SCharles Manning parent = parent->parent; 4278753ac610SCharles Manning depth_limit--; 42790e8cc8bdSWilliam Juul } 4280753ac610SCharles Manning if (parent != dev->root_dir) 4281753ac610SCharles Manning hanging = 1; 42820e8cc8bdSWilliam Juul } 4283753ac610SCharles Manning if (hanging) { 4284753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_SCAN, 4285753ac610SCharles Manning "Hanging object %d moved to lost and found", 4286753ac610SCharles Manning obj->obj_id); 4287753ac610SCharles Manning yaffs_add_obj_to_dir(dev->lost_n_found, obj); 42880e8cc8bdSWilliam Juul } 4289753ac610SCharles Manning } 42900e8cc8bdSWilliam Juul } 42910e8cc8bdSWilliam Juul } 42920e8cc8bdSWilliam Juul 4293753ac610SCharles Manning /* 4294753ac610SCharles Manning * Delete directory contents for cleaning up lost and found. 4295753ac610SCharles Manning */ 4296753ac610SCharles Manning static void yaffs_del_dir_contents(struct yaffs_obj *dir) 4297753ac610SCharles Manning { 4298753ac610SCharles Manning struct yaffs_obj *obj; 4299753ac610SCharles Manning struct list_head *lh; 4300753ac610SCharles Manning struct list_head *n; 4301753ac610SCharles Manning 4302753ac610SCharles Manning if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) 4303753ac610SCharles Manning BUG(); 4304753ac610SCharles Manning 4305753ac610SCharles Manning list_for_each_safe(lh, n, &dir->variant.dir_variant.children) { 4306753ac610SCharles Manning obj = list_entry(lh, struct yaffs_obj, siblings); 4307753ac610SCharles Manning if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) 4308753ac610SCharles Manning yaffs_del_dir_contents(obj); 4309753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_SCAN, 4310753ac610SCharles Manning "Deleting lost_found object %d", 4311753ac610SCharles Manning obj->obj_id); 4312753ac610SCharles Manning yaffs_unlink_obj(obj); 4313753ac610SCharles Manning } 4314753ac610SCharles Manning } 4315753ac610SCharles Manning 4316753ac610SCharles Manning static void yaffs_empty_l_n_f(struct yaffs_dev *dev) 4317753ac610SCharles Manning { 4318753ac610SCharles Manning yaffs_del_dir_contents(dev->lost_n_found); 4319753ac610SCharles Manning } 4320753ac610SCharles Manning 4321753ac610SCharles Manning 4322753ac610SCharles Manning struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory, 43230e8cc8bdSWilliam Juul const YCHAR *name) 43240e8cc8bdSWilliam Juul { 43250e8cc8bdSWilliam Juul int sum; 43260e8cc8bdSWilliam Juul struct list_head *i; 43270e8cc8bdSWilliam Juul YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1]; 4328753ac610SCharles Manning struct yaffs_obj *l; 43290e8cc8bdSWilliam Juul 4330753ac610SCharles Manning if (!name) 43310e8cc8bdSWilliam Juul return NULL; 43320e8cc8bdSWilliam Juul 43330e8cc8bdSWilliam Juul if (!directory) { 4334753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 4335753ac610SCharles Manning "tragedy: yaffs_find_by_name: null pointer directory" 4336753ac610SCharles Manning ); 4337753ac610SCharles Manning BUG(); 43380e8cc8bdSWilliam Juul return NULL; 43390e8cc8bdSWilliam Juul } 4340753ac610SCharles Manning if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { 4341753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 4342753ac610SCharles Manning "tragedy: yaffs_find_by_name: non-directory" 4343753ac610SCharles Manning ); 4344753ac610SCharles Manning BUG(); 43450e8cc8bdSWilliam Juul } 43460e8cc8bdSWilliam Juul 4347753ac610SCharles Manning sum = yaffs_calc_name_sum(name); 43480e8cc8bdSWilliam Juul 4349753ac610SCharles Manning list_for_each(i, &directory->variant.dir_variant.children) { 4350753ac610SCharles Manning l = list_entry(i, struct yaffs_obj, siblings); 43510e8cc8bdSWilliam Juul 4352753ac610SCharles Manning if (l->parent != directory) 4353753ac610SCharles Manning BUG(); 4354753ac610SCharles Manning 4355753ac610SCharles Manning yaffs_check_obj_details_loaded(l); 4356753ac610SCharles Manning 4357753ac610SCharles Manning /* Special case for lost-n-found */ 4358753ac610SCharles Manning if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) { 4359753ac610SCharles Manning if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME)) 4360753ac610SCharles Manning return l; 4361753ac610SCharles Manning } else if (l->sum == sum || l->hdr_chunk <= 0) { 4362753ac610SCharles Manning /* LostnFound chunk called Objxxx 4363753ac610SCharles Manning * Do a real check 4364753ac610SCharles Manning */ 4365753ac610SCharles Manning yaffs_get_obj_name(l, buffer, 4366753ac610SCharles Manning YAFFS_MAX_NAME_LENGTH + 1); 4367753ac610SCharles Manning if (!yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH)) 4368753ac610SCharles Manning return l; 43690e8cc8bdSWilliam Juul } 4370753ac610SCharles Manning } 4371753ac610SCharles Manning return NULL; 4372753ac610SCharles Manning } 43730e8cc8bdSWilliam Juul 43740e8cc8bdSWilliam Juul /* GetEquivalentObject dereferences any hard links to get to the 43750e8cc8bdSWilliam Juul * actual object. 43760e8cc8bdSWilliam Juul */ 43770e8cc8bdSWilliam Juul 4378753ac610SCharles Manning struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj) 43790e8cc8bdSWilliam Juul { 4380753ac610SCharles Manning if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) { 4381753ac610SCharles Manning obj = obj->variant.hardlink_variant.equiv_obj; 4382753ac610SCharles Manning yaffs_check_obj_details_loaded(obj); 43830e8cc8bdSWilliam Juul } 43840e8cc8bdSWilliam Juul return obj; 43850e8cc8bdSWilliam Juul } 43860e8cc8bdSWilliam Juul 4387753ac610SCharles Manning /* 4388753ac610SCharles Manning * A note or two on object names. 4389753ac610SCharles Manning * * If the object name is missing, we then make one up in the form objnnn 4390753ac610SCharles Manning * 4391753ac610SCharles Manning * * ASCII names are stored in the object header's name field from byte zero 4392753ac610SCharles Manning * * Unicode names are historically stored starting from byte zero. 4393753ac610SCharles Manning * 4394753ac610SCharles Manning * Then there are automatic Unicode names... 4395753ac610SCharles Manning * The purpose of these is to save names in a way that can be read as 4396753ac610SCharles Manning * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII 4397753ac610SCharles Manning * system to share files. 4398753ac610SCharles Manning * 4399753ac610SCharles Manning * These automatic unicode are stored slightly differently... 4400753ac610SCharles Manning * - If the name can fit in the ASCII character space then they are saved as 4401753ac610SCharles Manning * ascii names as per above. 4402753ac610SCharles Manning * - If the name needs Unicode then the name is saved in Unicode 4403753ac610SCharles Manning * starting at oh->name[1]. 4404753ac610SCharles Manning 4405753ac610SCharles Manning */ 4406753ac610SCharles Manning static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name, 4407753ac610SCharles Manning int buffer_size) 44080e8cc8bdSWilliam Juul { 4409753ac610SCharles Manning /* Create an object name if we could not find one. */ 4410753ac610SCharles Manning if (yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) { 4411753ac610SCharles Manning YCHAR local_name[20]; 4412753ac610SCharles Manning YCHAR num_string[20]; 4413753ac610SCharles Manning YCHAR *x = &num_string[19]; 4414753ac610SCharles Manning unsigned v = obj->obj_id; 4415753ac610SCharles Manning num_string[19] = 0; 4416753ac610SCharles Manning while (v > 0) { 4417753ac610SCharles Manning x--; 4418753ac610SCharles Manning *x = '0' + (v % 10); 4419753ac610SCharles Manning v /= 10; 4420753ac610SCharles Manning } 44210e8cc8bdSWilliam Juul /* make up a name */ 4422753ac610SCharles Manning yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX); 4423753ac610SCharles Manning yaffs_strcat(local_name, x); 4424753ac610SCharles Manning yaffs_strncpy(name, local_name, buffer_size - 1); 44250e8cc8bdSWilliam Juul } 44260e8cc8bdSWilliam Juul } 44270e8cc8bdSWilliam Juul 4428753ac610SCharles Manning int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size) 44290e8cc8bdSWilliam Juul { 4430753ac610SCharles Manning memset(name, 0, buffer_size * sizeof(YCHAR)); 4431753ac610SCharles Manning yaffs_check_obj_details_loaded(obj); 4432753ac610SCharles Manning if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) { 4433753ac610SCharles Manning yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1); 4434753ac610SCharles Manning } else if (obj->short_name[0]) { 4435753ac610SCharles Manning yaffs_strcpy(name, obj->short_name); 4436753ac610SCharles Manning } else if (obj->hdr_chunk > 0) { 4437753ac610SCharles Manning u8 *buffer = yaffs_get_temp_buffer(obj->my_dev); 44380e8cc8bdSWilliam Juul 4439753ac610SCharles Manning struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer; 44400e8cc8bdSWilliam Juul 4441753ac610SCharles Manning memset(buffer, 0, obj->my_dev->data_bytes_per_chunk); 4442753ac610SCharles Manning 4443753ac610SCharles Manning if (obj->hdr_chunk > 0) { 4444*8cc64bafSAnatolij Gustschin yaffs_rd_chunk_tags_nand(obj->my_dev, 4445753ac610SCharles Manning obj->hdr_chunk, 4446753ac610SCharles Manning buffer, NULL); 44470e8cc8bdSWilliam Juul } 4448753ac610SCharles Manning yaffs_load_name_from_oh(obj->my_dev, name, oh->name, 4449753ac610SCharles Manning buffer_size); 4450753ac610SCharles Manning 4451753ac610SCharles Manning yaffs_release_temp_buffer(obj->my_dev, buffer); 4452753ac610SCharles Manning } 4453753ac610SCharles Manning 4454753ac610SCharles Manning yaffs_fix_null_name(obj, name, buffer_size); 4455753ac610SCharles Manning 4456753ac610SCharles Manning return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH); 4457753ac610SCharles Manning } 4458753ac610SCharles Manning 4459753ac610SCharles Manning loff_t yaffs_get_obj_length(struct yaffs_obj *obj) 4460753ac610SCharles Manning { 4461753ac610SCharles Manning /* Dereference any hard linking */ 4462753ac610SCharles Manning obj = yaffs_get_equivalent_obj(obj); 4463753ac610SCharles Manning 4464753ac610SCharles Manning if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) 4465753ac610SCharles Manning return obj->variant.file_variant.file_size; 4466753ac610SCharles Manning if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) { 4467753ac610SCharles Manning if (!obj->variant.symlink_variant.alias) 4468753ac610SCharles Manning return 0; 4469753ac610SCharles Manning return yaffs_strnlen(obj->variant.symlink_variant.alias, 4470753ac610SCharles Manning YAFFS_MAX_ALIAS_LENGTH); 44710e8cc8bdSWilliam Juul } else { 44720e8cc8bdSWilliam Juul /* Only a directory should drop through to here */ 4473753ac610SCharles Manning return obj->my_dev->data_bytes_per_chunk; 44740e8cc8bdSWilliam Juul } 44750e8cc8bdSWilliam Juul } 44760e8cc8bdSWilliam Juul 4477753ac610SCharles Manning int yaffs_get_obj_link_count(struct yaffs_obj *obj) 44780e8cc8bdSWilliam Juul { 44790e8cc8bdSWilliam Juul int count = 0; 44800e8cc8bdSWilliam Juul struct list_head *i; 44810e8cc8bdSWilliam Juul 4482753ac610SCharles Manning if (!obj->unlinked) 44830e8cc8bdSWilliam Juul count++; /* the object itself */ 4484753ac610SCharles Manning 4485753ac610SCharles Manning list_for_each(i, &obj->hard_links) 44860e8cc8bdSWilliam Juul count++; /* add the hard links; */ 4487753ac610SCharles Manning 44880e8cc8bdSWilliam Juul return count; 44890e8cc8bdSWilliam Juul } 44900e8cc8bdSWilliam Juul 4491753ac610SCharles Manning int yaffs_get_obj_inode(struct yaffs_obj *obj) 44920e8cc8bdSWilliam Juul { 4493753ac610SCharles Manning obj = yaffs_get_equivalent_obj(obj); 44940e8cc8bdSWilliam Juul 4495753ac610SCharles Manning return obj->obj_id; 44960e8cc8bdSWilliam Juul } 44970e8cc8bdSWilliam Juul 4498753ac610SCharles Manning unsigned yaffs_get_obj_type(struct yaffs_obj *obj) 44990e8cc8bdSWilliam Juul { 4500753ac610SCharles Manning obj = yaffs_get_equivalent_obj(obj); 45010e8cc8bdSWilliam Juul 4502753ac610SCharles Manning switch (obj->variant_type) { 45030e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_FILE: 45040e8cc8bdSWilliam Juul return DT_REG; 45050e8cc8bdSWilliam Juul break; 45060e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_DIRECTORY: 45070e8cc8bdSWilliam Juul return DT_DIR; 45080e8cc8bdSWilliam Juul break; 45090e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SYMLINK: 45100e8cc8bdSWilliam Juul return DT_LNK; 45110e8cc8bdSWilliam Juul break; 45120e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_HARDLINK: 45130e8cc8bdSWilliam Juul return DT_REG; 45140e8cc8bdSWilliam Juul break; 45150e8cc8bdSWilliam Juul case YAFFS_OBJECT_TYPE_SPECIAL: 45160e8cc8bdSWilliam Juul if (S_ISFIFO(obj->yst_mode)) 45170e8cc8bdSWilliam Juul return DT_FIFO; 45180e8cc8bdSWilliam Juul if (S_ISCHR(obj->yst_mode)) 45190e8cc8bdSWilliam Juul return DT_CHR; 45200e8cc8bdSWilliam Juul if (S_ISBLK(obj->yst_mode)) 45210e8cc8bdSWilliam Juul return DT_BLK; 45220e8cc8bdSWilliam Juul if (S_ISSOCK(obj->yst_mode)) 45230e8cc8bdSWilliam Juul return DT_SOCK; 4524753ac610SCharles Manning return DT_REG; 4525753ac610SCharles Manning break; 45260e8cc8bdSWilliam Juul default: 45270e8cc8bdSWilliam Juul return DT_REG; 45280e8cc8bdSWilliam Juul break; 45290e8cc8bdSWilliam Juul } 45300e8cc8bdSWilliam Juul } 45310e8cc8bdSWilliam Juul 4532753ac610SCharles Manning YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj) 45330e8cc8bdSWilliam Juul { 4534753ac610SCharles Manning obj = yaffs_get_equivalent_obj(obj); 4535753ac610SCharles Manning if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) 4536753ac610SCharles Manning return yaffs_clone_str(obj->variant.symlink_variant.alias); 4537753ac610SCharles Manning else 4538753ac610SCharles Manning return yaffs_clone_str(_Y("")); 45390e8cc8bdSWilliam Juul } 45400e8cc8bdSWilliam Juul 4541753ac610SCharles Manning /*--------------------------- Initialisation code -------------------------- */ 45420e8cc8bdSWilliam Juul 4543753ac610SCharles Manning static int yaffs_check_dev_fns(const struct yaffs_dev *dev) 45440e8cc8bdSWilliam Juul { 45450e8cc8bdSWilliam Juul /* Common functions, gotta have */ 4546753ac610SCharles Manning if (!dev->param.erase_fn || !dev->param.initialise_flash_fn) 45470e8cc8bdSWilliam Juul return 0; 45480e8cc8bdSWilliam Juul 45490e8cc8bdSWilliam Juul /* Can use the "with tags" style interface for yaffs1 or yaffs2 */ 4550753ac610SCharles Manning if (dev->param.write_chunk_tags_fn && 4551753ac610SCharles Manning dev->param.read_chunk_tags_fn && 4552753ac610SCharles Manning !dev->param.write_chunk_fn && 4553753ac610SCharles Manning !dev->param.read_chunk_fn && 4554753ac610SCharles Manning dev->param.bad_block_fn && dev->param.query_block_fn) 45550e8cc8bdSWilliam Juul return 1; 45560e8cc8bdSWilliam Juul 45570e8cc8bdSWilliam Juul /* Can use the "spare" style interface for yaffs1 */ 4558753ac610SCharles Manning if (!dev->param.is_yaffs2 && 4559753ac610SCharles Manning !dev->param.write_chunk_tags_fn && 4560753ac610SCharles Manning !dev->param.read_chunk_tags_fn && 4561753ac610SCharles Manning dev->param.write_chunk_fn && 4562753ac610SCharles Manning dev->param.read_chunk_fn && 4563753ac610SCharles Manning !dev->param.bad_block_fn && !dev->param.query_block_fn) 45640e8cc8bdSWilliam Juul return 1; 45650e8cc8bdSWilliam Juul 45660e8cc8bdSWilliam Juul return 0; /* bad */ 45670e8cc8bdSWilliam Juul } 45680e8cc8bdSWilliam Juul 4569753ac610SCharles Manning static int yaffs_create_initial_dir(struct yaffs_dev *dev) 45700e8cc8bdSWilliam Juul { 4571753ac610SCharles Manning /* Initialise the unlinked, deleted, root and lost+found directories */ 4572753ac610SCharles Manning dev->lost_n_found = dev->root_dir = NULL; 4573753ac610SCharles Manning dev->unlinked_dir = dev->del_dir = NULL; 4574753ac610SCharles Manning dev->unlinked_dir = 4575753ac610SCharles Manning yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR); 4576753ac610SCharles Manning dev->del_dir = 4577753ac610SCharles Manning yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR); 4578753ac610SCharles Manning dev->root_dir = 4579753ac610SCharles Manning yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT, 45800e8cc8bdSWilliam Juul YAFFS_ROOT_MODE | S_IFDIR); 4581753ac610SCharles Manning dev->lost_n_found = 4582753ac610SCharles Manning yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND, 45830e8cc8bdSWilliam Juul YAFFS_LOSTNFOUND_MODE | S_IFDIR); 45840e8cc8bdSWilliam Juul 4585753ac610SCharles Manning if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir 4586753ac610SCharles Manning && dev->del_dir) { 4587753ac610SCharles Manning yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found); 45880e8cc8bdSWilliam Juul return YAFFS_OK; 45890e8cc8bdSWilliam Juul } 45900e8cc8bdSWilliam Juul return YAFFS_FAIL; 45910e8cc8bdSWilliam Juul } 45920e8cc8bdSWilliam Juul 4593753ac610SCharles Manning int yaffs_guts_initialise(struct yaffs_dev *dev) 45940e8cc8bdSWilliam Juul { 45950e8cc8bdSWilliam Juul int init_failed = 0; 45960e8cc8bdSWilliam Juul unsigned x; 45970e8cc8bdSWilliam Juul int bits; 45980e8cc8bdSWilliam Juul 4599753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_guts_initialise()"); 46000e8cc8bdSWilliam Juul 46010e8cc8bdSWilliam Juul /* Check stuff that must be set */ 46020e8cc8bdSWilliam Juul 46030e8cc8bdSWilliam Juul if (!dev) { 4604753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 4605753ac610SCharles Manning "yaffs: Need a device" 4606753ac610SCharles Manning ); 46070e8cc8bdSWilliam Juul return YAFFS_FAIL; 46080e8cc8bdSWilliam Juul } 46090e8cc8bdSWilliam Juul 4610753ac610SCharles Manning if (dev->is_mounted) { 4611753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted"); 4612753ac610SCharles Manning return YAFFS_FAIL; 4613753ac610SCharles Manning } 46140e8cc8bdSWilliam Juul 4615753ac610SCharles Manning dev->internal_start_block = dev->param.start_block; 4616753ac610SCharles Manning dev->internal_end_block = dev->param.end_block; 4617753ac610SCharles Manning dev->block_offset = 0; 4618753ac610SCharles Manning dev->chunk_offset = 0; 4619753ac610SCharles Manning dev->n_free_chunks = 0; 4620753ac610SCharles Manning 4621753ac610SCharles Manning dev->gc_block = 0; 4622753ac610SCharles Manning 4623753ac610SCharles Manning if (dev->param.start_block == 0) { 4624753ac610SCharles Manning dev->internal_start_block = dev->param.start_block + 1; 4625753ac610SCharles Manning dev->internal_end_block = dev->param.end_block + 1; 4626753ac610SCharles Manning dev->block_offset = 1; 4627753ac610SCharles Manning dev->chunk_offset = dev->param.chunks_per_block; 46280e8cc8bdSWilliam Juul } 46290e8cc8bdSWilliam Juul 46300e8cc8bdSWilliam Juul /* Check geometry parameters. */ 46310e8cc8bdSWilliam Juul 4632753ac610SCharles Manning if ((!dev->param.inband_tags && dev->param.is_yaffs2 && 4633753ac610SCharles Manning dev->param.total_bytes_per_chunk < 1024) || 4634753ac610SCharles Manning (!dev->param.is_yaffs2 && 4635753ac610SCharles Manning dev->param.total_bytes_per_chunk < 512) || 4636753ac610SCharles Manning (dev->param.inband_tags && !dev->param.is_yaffs2) || 4637753ac610SCharles Manning dev->param.chunks_per_block < 2 || 4638753ac610SCharles Manning dev->param.n_reserved_blocks < 2 || 4639753ac610SCharles Manning dev->internal_start_block <= 0 || 4640753ac610SCharles Manning dev->internal_end_block <= 0 || 4641753ac610SCharles Manning dev->internal_end_block <= 4642753ac610SCharles Manning (dev->internal_start_block + dev->param.n_reserved_blocks + 2) 46430e8cc8bdSWilliam Juul ) { 4644753ac610SCharles Manning /* otherwise it is too small */ 4645753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 4646753ac610SCharles Manning "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ", 4647753ac610SCharles Manning dev->param.total_bytes_per_chunk, 4648753ac610SCharles Manning dev->param.is_yaffs2 ? "2" : "", 4649753ac610SCharles Manning dev->param.inband_tags); 46500e8cc8bdSWilliam Juul return YAFFS_FAIL; 46510e8cc8bdSWilliam Juul } 46520e8cc8bdSWilliam Juul 4653753ac610SCharles Manning if (yaffs_init_nand(dev) != YAFFS_OK) { 4654753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed"); 46550e8cc8bdSWilliam Juul return YAFFS_FAIL; 46560e8cc8bdSWilliam Juul } 46570e8cc8bdSWilliam Juul 4658753ac610SCharles Manning /* Sort out space for inband tags, if required */ 4659753ac610SCharles Manning if (dev->param.inband_tags) 4660753ac610SCharles Manning dev->data_bytes_per_chunk = 4661753ac610SCharles Manning dev->param.total_bytes_per_chunk - 4662753ac610SCharles Manning sizeof(struct yaffs_packed_tags2_tags_only); 4663753ac610SCharles Manning else 4664753ac610SCharles Manning dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk; 4665753ac610SCharles Manning 46660e8cc8bdSWilliam Juul /* Got the right mix of functions? */ 4667753ac610SCharles Manning if (!yaffs_check_dev_fns(dev)) { 46680e8cc8bdSWilliam Juul /* Function missing */ 4669753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, 4670753ac610SCharles Manning "device function(s) missing or wrong"); 46710e8cc8bdSWilliam Juul 46720e8cc8bdSWilliam Juul return YAFFS_FAIL; 46730e8cc8bdSWilliam Juul } 46740e8cc8bdSWilliam Juul 4675753ac610SCharles Manning /* Finished with most checks. Further checks happen later on too. */ 46760e8cc8bdSWilliam Juul 4677753ac610SCharles Manning dev->is_mounted = 1; 46780e8cc8bdSWilliam Juul 46790e8cc8bdSWilliam Juul /* OK now calculate a few things for the device */ 46800e8cc8bdSWilliam Juul 46810e8cc8bdSWilliam Juul /* 46820e8cc8bdSWilliam Juul * Calculate all the chunk size manipulation numbers: 46830e8cc8bdSWilliam Juul */ 4684753ac610SCharles Manning x = dev->data_bytes_per_chunk; 4685753ac610SCharles Manning /* We always use dev->chunk_shift and dev->chunk_div */ 4686753ac610SCharles Manning dev->chunk_shift = calc_shifts(x); 4687753ac610SCharles Manning x >>= dev->chunk_shift; 4688753ac610SCharles Manning dev->chunk_div = x; 4689753ac610SCharles Manning /* We only use chunk mask if chunk_div is 1 */ 4690753ac610SCharles Manning dev->chunk_mask = (1 << dev->chunk_shift) - 1; 46910e8cc8bdSWilliam Juul 46920e8cc8bdSWilliam Juul /* 4693753ac610SCharles Manning * Calculate chunk_grp_bits. 4694753ac610SCharles Manning * We need to find the next power of 2 > than internal_end_block 46950e8cc8bdSWilliam Juul */ 46960e8cc8bdSWilliam Juul 4697753ac610SCharles Manning x = dev->param.chunks_per_block * (dev->internal_end_block + 1); 46980e8cc8bdSWilliam Juul 4699753ac610SCharles Manning bits = calc_shifts_ceiling(x); 47000e8cc8bdSWilliam Juul 47010e8cc8bdSWilliam Juul /* Set up tnode width if wide tnodes are enabled. */ 4702753ac610SCharles Manning if (!dev->param.wide_tnodes_disabled) { 47030e8cc8bdSWilliam Juul /* bits must be even so that we end up with 32-bit words */ 47040e8cc8bdSWilliam Juul if (bits & 1) 47050e8cc8bdSWilliam Juul bits++; 47060e8cc8bdSWilliam Juul if (bits < 16) 4707753ac610SCharles Manning dev->tnode_width = 16; 47080e8cc8bdSWilliam Juul else 4709753ac610SCharles Manning dev->tnode_width = bits; 4710753ac610SCharles Manning } else { 4711753ac610SCharles Manning dev->tnode_width = 16; 47120e8cc8bdSWilliam Juul } 47130e8cc8bdSWilliam Juul 4714753ac610SCharles Manning dev->tnode_mask = (1 << dev->tnode_width) - 1; 47150e8cc8bdSWilliam Juul 47160e8cc8bdSWilliam Juul /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled), 47170e8cc8bdSWilliam Juul * so if the bitwidth of the 47180e8cc8bdSWilliam Juul * chunk range we're using is greater than 16 we need 4719753ac610SCharles Manning * to figure out chunk shift and chunk_grp_size 47200e8cc8bdSWilliam Juul */ 47210e8cc8bdSWilliam Juul 4722753ac610SCharles Manning if (bits <= dev->tnode_width) 4723753ac610SCharles Manning dev->chunk_grp_bits = 0; 47240e8cc8bdSWilliam Juul else 4725753ac610SCharles Manning dev->chunk_grp_bits = bits - dev->tnode_width; 47260e8cc8bdSWilliam Juul 4727753ac610SCharles Manning dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8; 4728753ac610SCharles Manning if (dev->tnode_size < sizeof(struct yaffs_tnode)) 4729753ac610SCharles Manning dev->tnode_size = sizeof(struct yaffs_tnode); 47300e8cc8bdSWilliam Juul 4731753ac610SCharles Manning dev->chunk_grp_size = 1 << dev->chunk_grp_bits; 47320e8cc8bdSWilliam Juul 4733753ac610SCharles Manning if (dev->param.chunks_per_block < dev->chunk_grp_size) { 47340e8cc8bdSWilliam Juul /* We have a problem because the soft delete won't work if 47350e8cc8bdSWilliam Juul * the chunk group size > chunks per block. 47360e8cc8bdSWilliam Juul * This can be remedied by using larger "virtual blocks". 47370e8cc8bdSWilliam Juul */ 4738753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large"); 47390e8cc8bdSWilliam Juul 47400e8cc8bdSWilliam Juul return YAFFS_FAIL; 47410e8cc8bdSWilliam Juul } 47420e8cc8bdSWilliam Juul 4743753ac610SCharles Manning /* Finished verifying the device, continue with initialisation */ 47440e8cc8bdSWilliam Juul 47450e8cc8bdSWilliam Juul /* More device initialisation */ 4746753ac610SCharles Manning dev->all_gcs = 0; 4747753ac610SCharles Manning dev->passive_gc_count = 0; 4748753ac610SCharles Manning dev->oldest_dirty_gc_count = 0; 4749753ac610SCharles Manning dev->bg_gcs = 0; 4750753ac610SCharles Manning dev->gc_block_finder = 0; 4751753ac610SCharles Manning dev->buffered_block = -1; 4752753ac610SCharles Manning dev->doing_buffered_block_rewrite = 0; 4753753ac610SCharles Manning dev->n_deleted_files = 0; 4754753ac610SCharles Manning dev->n_bg_deletions = 0; 4755753ac610SCharles Manning dev->n_unlinked_files = 0; 4756753ac610SCharles Manning dev->n_ecc_fixed = 0; 4757753ac610SCharles Manning dev->n_ecc_unfixed = 0; 4758753ac610SCharles Manning dev->n_tags_ecc_fixed = 0; 4759753ac610SCharles Manning dev->n_tags_ecc_unfixed = 0; 4760753ac610SCharles Manning dev->n_erase_failures = 0; 4761753ac610SCharles Manning dev->n_erased_blocks = 0; 4762753ac610SCharles Manning dev->gc_disable = 0; 4763753ac610SCharles Manning dev->has_pending_prioritised_gc = 1; 4764753ac610SCharles Manning /* Assume the worst for now, will get fixed on first GC */ 4765753ac610SCharles Manning INIT_LIST_HEAD(&dev->dirty_dirs); 4766753ac610SCharles Manning dev->oldest_dirty_seq = 0; 4767753ac610SCharles Manning dev->oldest_dirty_block = 0; 47680e8cc8bdSWilliam Juul 47690e8cc8bdSWilliam Juul /* Initialise temporary buffers and caches. */ 4770753ac610SCharles Manning if (!yaffs_init_tmp_buffers(dev)) 47710e8cc8bdSWilliam Juul init_failed = 1; 47720e8cc8bdSWilliam Juul 4773753ac610SCharles Manning dev->cache = NULL; 4774753ac610SCharles Manning dev->gc_cleanup_list = NULL; 47750e8cc8bdSWilliam Juul 4776753ac610SCharles Manning if (!init_failed && dev->param.n_caches > 0) { 47770e8cc8bdSWilliam Juul int i; 4778753ac610SCharles Manning void *buf; 4779753ac610SCharles Manning int cache_bytes = 4780753ac610SCharles Manning dev->param.n_caches * sizeof(struct yaffs_cache); 47810e8cc8bdSWilliam Juul 4782753ac610SCharles Manning if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES) 4783753ac610SCharles Manning dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES; 47840e8cc8bdSWilliam Juul 4785753ac610SCharles Manning dev->cache = kmalloc(cache_bytes, GFP_NOFS); 47860e8cc8bdSWilliam Juul 4787753ac610SCharles Manning buf = (u8 *) dev->cache; 47880e8cc8bdSWilliam Juul 4789753ac610SCharles Manning if (dev->cache) 4790753ac610SCharles Manning memset(dev->cache, 0, cache_bytes); 4791753ac610SCharles Manning 4792753ac610SCharles Manning for (i = 0; i < dev->param.n_caches && buf; i++) { 4793753ac610SCharles Manning dev->cache[i].object = NULL; 4794753ac610SCharles Manning dev->cache[i].last_use = 0; 4795753ac610SCharles Manning dev->cache[i].dirty = 0; 4796753ac610SCharles Manning dev->cache[i].data = buf = 4797753ac610SCharles Manning kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS); 47980e8cc8bdSWilliam Juul } 47990e8cc8bdSWilliam Juul if (!buf) 48000e8cc8bdSWilliam Juul init_failed = 1; 48010e8cc8bdSWilliam Juul 4802753ac610SCharles Manning dev->cache_last_use = 0; 48030e8cc8bdSWilliam Juul } 48040e8cc8bdSWilliam Juul 4805753ac610SCharles Manning dev->cache_hits = 0; 48060e8cc8bdSWilliam Juul 48070e8cc8bdSWilliam Juul if (!init_failed) { 4808753ac610SCharles Manning dev->gc_cleanup_list = 4809753ac610SCharles Manning kmalloc(dev->param.chunks_per_block * sizeof(u32), 4810753ac610SCharles Manning GFP_NOFS); 4811753ac610SCharles Manning if (!dev->gc_cleanup_list) 48120e8cc8bdSWilliam Juul init_failed = 1; 48130e8cc8bdSWilliam Juul } 48140e8cc8bdSWilliam Juul 4815753ac610SCharles Manning if (dev->param.is_yaffs2) 4816753ac610SCharles Manning dev->param.use_header_file_size = 1; 4817753ac610SCharles Manning 4818753ac610SCharles Manning if (!init_failed && !yaffs_init_blocks(dev)) 48190e8cc8bdSWilliam Juul init_failed = 1; 48200e8cc8bdSWilliam Juul 4821753ac610SCharles Manning yaffs_init_tnodes_and_objs(dev); 48220e8cc8bdSWilliam Juul 4823753ac610SCharles Manning if (!init_failed && !yaffs_create_initial_dir(dev)) 48240e8cc8bdSWilliam Juul init_failed = 1; 48250e8cc8bdSWilliam Juul 4826753ac610SCharles Manning if (!init_failed && dev->param.is_yaffs2 && 4827753ac610SCharles Manning !dev->param.disable_summary && 4828753ac610SCharles Manning !yaffs_summary_init(dev)) 4829753ac610SCharles Manning init_failed = 1; 48300e8cc8bdSWilliam Juul 48310e8cc8bdSWilliam Juul if (!init_failed) { 48320e8cc8bdSWilliam Juul /* Now scan the flash. */ 4833753ac610SCharles Manning if (dev->param.is_yaffs2) { 4834753ac610SCharles Manning if (yaffs2_checkpt_restore(dev)) { 4835753ac610SCharles Manning yaffs_check_obj_details_loaded(dev->root_dir); 4836753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_CHECKPOINT | 4837753ac610SCharles Manning YAFFS_TRACE_MOUNT, 4838753ac610SCharles Manning "yaffs: restored from checkpoint" 4839753ac610SCharles Manning ); 48400e8cc8bdSWilliam Juul } else { 48410e8cc8bdSWilliam Juul 4842753ac610SCharles Manning /* Clean up the mess caused by an aborted 4843753ac610SCharles Manning * checkpoint load then scan backwards. 48440e8cc8bdSWilliam Juul */ 4845753ac610SCharles Manning yaffs_deinit_blocks(dev); 48460e8cc8bdSWilliam Juul 4847753ac610SCharles Manning yaffs_deinit_tnodes_and_objs(dev); 48480e8cc8bdSWilliam Juul 4849753ac610SCharles Manning dev->n_erased_blocks = 0; 4850753ac610SCharles Manning dev->n_free_chunks = 0; 4851753ac610SCharles Manning dev->alloc_block = -1; 4852753ac610SCharles Manning dev->alloc_page = -1; 4853753ac610SCharles Manning dev->n_deleted_files = 0; 4854753ac610SCharles Manning dev->n_unlinked_files = 0; 4855753ac610SCharles Manning dev->n_bg_deletions = 0; 48560e8cc8bdSWilliam Juul 4857753ac610SCharles Manning if (!init_failed && !yaffs_init_blocks(dev)) 48580e8cc8bdSWilliam Juul init_failed = 1; 48590e8cc8bdSWilliam Juul 4860753ac610SCharles Manning yaffs_init_tnodes_and_objs(dev); 48610e8cc8bdSWilliam Juul 4862753ac610SCharles Manning if (!init_failed 4863753ac610SCharles Manning && !yaffs_create_initial_dir(dev)) 48640e8cc8bdSWilliam Juul init_failed = 1; 48650e8cc8bdSWilliam Juul 4866753ac610SCharles Manning if (!init_failed && !yaffs2_scan_backwards(dev)) 48670e8cc8bdSWilliam Juul init_failed = 1; 48680e8cc8bdSWilliam Juul } 4869753ac610SCharles Manning } else if (!yaffs1_scan(dev)) { 48700e8cc8bdSWilliam Juul init_failed = 1; 48710e8cc8bdSWilliam Juul } 48720e8cc8bdSWilliam Juul 4873753ac610SCharles Manning yaffs_strip_deleted_objs(dev); 4874753ac610SCharles Manning yaffs_fix_hanging_objs(dev); 4875753ac610SCharles Manning if (dev->param.empty_lost_n_found) 4876753ac610SCharles Manning yaffs_empty_l_n_f(dev); 4877753ac610SCharles Manning } 4878753ac610SCharles Manning 48790e8cc8bdSWilliam Juul if (init_failed) { 48800e8cc8bdSWilliam Juul /* Clean up the mess */ 4881753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING, 4882753ac610SCharles Manning "yaffs: yaffs_guts_initialise() aborted."); 48830e8cc8bdSWilliam Juul 4884753ac610SCharles Manning yaffs_deinitialise(dev); 48850e8cc8bdSWilliam Juul return YAFFS_FAIL; 48860e8cc8bdSWilliam Juul } 48870e8cc8bdSWilliam Juul 48880e8cc8bdSWilliam Juul /* Zero out stats */ 4889753ac610SCharles Manning dev->n_page_reads = 0; 4890753ac610SCharles Manning dev->n_page_writes = 0; 4891753ac610SCharles Manning dev->n_erasures = 0; 4892753ac610SCharles Manning dev->n_gc_copies = 0; 4893753ac610SCharles Manning dev->n_retried_writes = 0; 48940e8cc8bdSWilliam Juul 4895753ac610SCharles Manning dev->n_retired_blocks = 0; 48960e8cc8bdSWilliam Juul 4897753ac610SCharles Manning yaffs_verify_free_chunks(dev); 4898753ac610SCharles Manning yaffs_verify_blocks(dev); 48990e8cc8bdSWilliam Juul 4900753ac610SCharles Manning /* Clean up any aborted checkpoint data */ 4901753ac610SCharles Manning if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0) 4902753ac610SCharles Manning yaffs2_checkpt_invalidate(dev); 49030e8cc8bdSWilliam Juul 4904753ac610SCharles Manning yaffs_trace(YAFFS_TRACE_TRACING, 4905753ac610SCharles Manning "yaffs: yaffs_guts_initialise() done."); 49060e8cc8bdSWilliam Juul return YAFFS_OK; 49070e8cc8bdSWilliam Juul } 49080e8cc8bdSWilliam Juul 4909753ac610SCharles Manning void yaffs_deinitialise(struct yaffs_dev *dev) 49100e8cc8bdSWilliam Juul { 4911753ac610SCharles Manning if (dev->is_mounted) { 49120e8cc8bdSWilliam Juul int i; 49130e8cc8bdSWilliam Juul 4914753ac610SCharles Manning yaffs_deinit_blocks(dev); 4915753ac610SCharles Manning yaffs_deinit_tnodes_and_objs(dev); 4916753ac610SCharles Manning yaffs_summary_deinit(dev); 49170e8cc8bdSWilliam Juul 4918753ac610SCharles Manning if (dev->param.n_caches > 0 && dev->cache) { 4919753ac610SCharles Manning 4920753ac610SCharles Manning for (i = 0; i < dev->param.n_caches; i++) { 4921753ac610SCharles Manning kfree(dev->cache[i].data); 4922753ac610SCharles Manning dev->cache[i].data = NULL; 49230e8cc8bdSWilliam Juul } 49240e8cc8bdSWilliam Juul 4925753ac610SCharles Manning kfree(dev->cache); 4926753ac610SCharles Manning dev->cache = NULL; 49270e8cc8bdSWilliam Juul } 49280e8cc8bdSWilliam Juul 4929753ac610SCharles Manning kfree(dev->gc_cleanup_list); 49300e8cc8bdSWilliam Juul 4931753ac610SCharles Manning for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) 4932753ac610SCharles Manning kfree(dev->temp_buffer[i].buffer); 4933753ac610SCharles Manning 4934753ac610SCharles Manning dev->is_mounted = 0; 4935753ac610SCharles Manning 4936753ac610SCharles Manning if (dev->param.deinitialise_flash_fn) 4937753ac610SCharles Manning dev->param.deinitialise_flash_fn(dev); 4938753ac610SCharles Manning } 49390e8cc8bdSWilliam Juul } 49400e8cc8bdSWilliam Juul 4941753ac610SCharles Manning int yaffs_count_free_chunks(struct yaffs_dev *dev) 49420e8cc8bdSWilliam Juul { 4943753ac610SCharles Manning int n_free = 0; 49440e8cc8bdSWilliam Juul int b; 4945753ac610SCharles Manning struct yaffs_block_info *blk; 49460e8cc8bdSWilliam Juul 4947753ac610SCharles Manning blk = dev->block_info; 4948753ac610SCharles Manning for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) { 4949753ac610SCharles Manning switch (blk->block_state) { 49500e8cc8bdSWilliam Juul case YAFFS_BLOCK_STATE_EMPTY: 49510e8cc8bdSWilliam Juul case YAFFS_BLOCK_STATE_ALLOCATING: 49520e8cc8bdSWilliam Juul case YAFFS_BLOCK_STATE_COLLECTING: 49530e8cc8bdSWilliam Juul case YAFFS_BLOCK_STATE_FULL: 4954753ac610SCharles Manning n_free += 4955753ac610SCharles Manning (dev->param.chunks_per_block - blk->pages_in_use + 4956753ac610SCharles Manning blk->soft_del_pages); 49570e8cc8bdSWilliam Juul break; 49580e8cc8bdSWilliam Juul default: 49590e8cc8bdSWilliam Juul break; 49600e8cc8bdSWilliam Juul } 4961753ac610SCharles Manning blk++; 4962753ac610SCharles Manning } 4963753ac610SCharles Manning return n_free; 49640e8cc8bdSWilliam Juul } 49650e8cc8bdSWilliam Juul 4966753ac610SCharles Manning int yaffs_get_n_free_chunks(struct yaffs_dev *dev) 49670e8cc8bdSWilliam Juul { 49680e8cc8bdSWilliam Juul /* This is what we report to the outside world */ 4969753ac610SCharles Manning int n_free; 4970753ac610SCharles Manning int n_dirty_caches; 4971753ac610SCharles Manning int blocks_for_checkpt; 49720e8cc8bdSWilliam Juul int i; 4973753ac610SCharles Manning 4974753ac610SCharles Manning n_free = dev->n_free_chunks; 4975753ac610SCharles Manning n_free += dev->n_deleted_files; 4976753ac610SCharles Manning 4977753ac610SCharles Manning /* Now count and subtract the number of dirty chunks in the cache. */ 4978753ac610SCharles Manning 4979753ac610SCharles Manning for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) { 4980753ac610SCharles Manning if (dev->cache[i].dirty) 4981753ac610SCharles Manning n_dirty_caches++; 49820e8cc8bdSWilliam Juul } 49830e8cc8bdSWilliam Juul 4984753ac610SCharles Manning n_free -= n_dirty_caches; 49850e8cc8bdSWilliam Juul 4986753ac610SCharles Manning n_free -= 4987753ac610SCharles Manning ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block); 49880e8cc8bdSWilliam Juul 4989753ac610SCharles Manning /* Now figure checkpoint space and report that... */ 4990753ac610SCharles Manning blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev); 49910e8cc8bdSWilliam Juul 4992753ac610SCharles Manning n_free -= (blocks_for_checkpt * dev->param.chunks_per_block); 49930e8cc8bdSWilliam Juul 4994753ac610SCharles Manning if (n_free < 0) 4995753ac610SCharles Manning n_free = 0; 49960e8cc8bdSWilliam Juul 4997753ac610SCharles Manning return n_free; 49980e8cc8bdSWilliam Juul } 49990e8cc8bdSWilliam Juul 5000753ac610SCharles Manning /*\ 5001753ac610SCharles Manning * Marshalling functions to get loff_t file sizes into aand out of 5002753ac610SCharles Manning * object headers. 5003753ac610SCharles Manning */ 5004753ac610SCharles Manning void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize) 50050e8cc8bdSWilliam Juul { 5006753ac610SCharles Manning oh->file_size_low = (fsize & 0xFFFFFFFF); 5007753ac610SCharles Manning oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF); 50080e8cc8bdSWilliam Juul } 50090e8cc8bdSWilliam Juul 5010753ac610SCharles Manning loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh) 50110e8cc8bdSWilliam Juul { 5012753ac610SCharles Manning loff_t retval; 50130e8cc8bdSWilliam Juul 5014753ac610SCharles Manning if (~(oh->file_size_high)) 5015753ac610SCharles Manning retval = (((loff_t) oh->file_size_high) << 32) | 5016753ac610SCharles Manning (((loff_t) oh->file_size_low) & 0xFFFFFFFF); 5017753ac610SCharles Manning else 5018753ac610SCharles Manning retval = (loff_t) oh->file_size_low; 5019753ac610SCharles Manning 5020753ac610SCharles Manning return retval; 50210e8cc8bdSWilliam Juul } 5022