int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk, u8 * buffer, struct yaffs_ext_tags *tags) { int result; struct yaffs_ext_tags local_tags; int realigned_chunk = nand_chunk - dev->chunk_offset; dev->n_page_reads++; /* If there are no tags provided, use local tags to get prioritised gc working */ if (!tags) tags = &local_tags; if (dev->param.read_chunk_tags_fn) result = dev->param.read_chunk_tags_fn(dev, realigned_chunk, buffer, tags); else result = yaffs_tags_compat_rd(dev, realigned_chunk, buffer, tags); if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) { struct yaffs_block_info *bi; bi = yaffs_get_block_info(dev, nand_chunk / dev->param.chunks_per_block); yaffs_handle_chunk_error(dev, bi); } return result; }
static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev) { int i; int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks; yaffs_trace(YAFFS_TRACE_CHECKPOINT, "allocating checkpt block: erased %d reserved %d avail %d next %d ", dev->n_erased_blocks, dev->param.n_reserved_blocks, blocks_avail, dev->checkpt_next_block); if (dev->checkpt_next_block >= 0 && dev->checkpt_next_block <= dev->internal_end_block && blocks_avail > 0) { for (i = dev->checkpt_next_block; i <= dev->internal_end_block; i++) { struct yaffs_block_info *bi = yaffs_get_block_info(dev, i); if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { dev->checkpt_next_block = i + 1; dev->checkpt_cur_block = i; yaffs_trace(YAFFS_TRACE_CHECKPOINT, "allocating checkpt block %d", i); return; } } } yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks"); dev->checkpt_next_block = -1; dev->checkpt_cur_block = -1; }
static int yaffs_checkpt_erase(yaffs_dev_t *dev) { int i; if (!dev->param.erase_fn) return 0; T(YAFFS_TRACE_CHECKPOINT, (TSTR("checking blocks %d to %d"TENDSTR), dev->internal_start_block, dev->internal_end_block)); for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { yaffs_block_info_t *bi = yaffs_get_block_info(dev, i); if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) { T(YAFFS_TRACE_CHECKPOINT, (TSTR("erasing checkpt block %d"TENDSTR), i)); dev->n_erasures++; if (dev->param.erase_fn(dev, i - dev->block_offset /* realign */)) { bi->block_state = YAFFS_BLOCK_STATE_EMPTY; dev->n_erased_blocks++; dev->n_free_chunks += dev->param.chunks_per_block; } else { dev->param.bad_block_fn(dev, i); bi->block_state = YAFFS_BLOCK_STATE_DEAD; } } } dev->blocks_in_checkpt = 0; return 1; }
static void yaffs2_checkpt_find_erased_block(yaffs_dev_t *dev) { int i; int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks; T(YAFFS_TRACE_CHECKPOINT, (TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR), dev->n_erased_blocks, dev->param.n_reserved_blocks, blocks_avail, dev->checkpt_next_block)); if (dev->checkpt_next_block >= 0 && dev->checkpt_next_block <= dev->internal_end_block && blocks_avail > 0) { for (i = dev->checkpt_next_block; i <= dev->internal_end_block; i++) { yaffs_block_info_t *bi = yaffs_get_block_info(dev, i); if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { dev->checkpt_next_block = i + 1; dev->checkpt_cur_block = i; T(YAFFS_TRACE_CHECKPOINT, (TSTR("allocating checkpt block %d"TENDSTR), i)); return; } } } T(YAFFS_TRACE_CHECKPOINT, (TSTR("out of checkpt blocks"TENDSTR))); dev->checkpt_next_block = -1; dev->checkpt_cur_block = -1; }
static int yaffs_summary_write(struct yaffs_dev *dev, int blk) { struct yaffs_ext_tags tags; u8 *buffer; u8 *sum_buffer = (u8 *)dev->sum_tags; int n_bytes; int chunk_in_nand; int chunk_in_block; int result; int this_tx; struct yaffs_summary_header hdr; int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr); struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk); buffer = yaffs_get_temp_buffer(dev); n_bytes = sizeof(struct yaffs_summary_tags) * dev->chunks_per_summary; memset(&tags, 0, sizeof(struct yaffs_ext_tags)); tags.obj_id = YAFFS_OBJECTID_SUMMARY; tags.chunk_id = 1; chunk_in_block = dev->chunks_per_summary; chunk_in_nand = dev->alloc_block * dev->param.chunks_per_block + dev->chunks_per_summary; hdr.version = YAFFS_SUMMARY_VERSION; hdr.block = blk; hdr.seq = bi->seq_number; hdr.sum = yaffs_summary_sum(dev); do { this_tx = n_bytes; if (this_tx > sum_bytes_per_chunk) this_tx = sum_bytes_per_chunk; memcpy(buffer, &hdr, sizeof(hdr)); memcpy(buffer + sizeof(hdr), sum_buffer, this_tx); tags.n_bytes = this_tx + sizeof(hdr); result = yaffs_wr_chunk_tags_nand(dev, chunk_in_nand, buffer, &tags); if (result != YAFFS_OK) break; yaffs_set_chunk_bit(dev, blk, chunk_in_block); bi->pages_in_use++; dev->n_free_chunks--; n_bytes -= this_tx; sum_buffer += this_tx; chunk_in_nand++; chunk_in_block++; tags.chunk_id++; } while (result == YAFFS_OK && n_bytes > 0); yaffs_release_temp_buffer(dev, buffer); if (result == YAFFS_OK) bi->has_summary = 1; return result; }
static void yaffs_handle_chunk_wr_error(yaffs_dev_t *dev, int nand_chunk) { int flash_block = nand_chunk / dev->param.chunks_per_block; /* Mark the block for retirement */ yaffs_get_block_info(dev, flash_block)->needs_retiring = 1; /* Delete the chunk */ yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); }
static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev) { int chunk; int realigned_chunk; struct yaffs_ext_tags tags; if (dev->checkpt_cur_block < 0) { yaffs2_checkpt_find_erased_block(dev); dev->checkpt_cur_chunk = 0; } if (dev->checkpt_cur_block < 0) return 0; tags.is_deleted = 0; tags.obj_id = dev->checkpt_next_block; /* Hint to next place to look */ tags.chunk_id = dev->checkpt_page_seq + 1; tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA; tags.n_bytes = dev->data_bytes_per_chunk; if (dev->checkpt_cur_chunk == 0) { /* First chunk we write for the block? Set block state to checkpoint */ struct yaffs_block_info *bi = yaffs_get_block_info(dev, dev->checkpt_cur_block); bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT; dev->blocks_in_checkpt++; } chunk = dev->checkpt_cur_block * dev->param.chunks_per_block + dev->checkpt_cur_chunk; yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checkpoint wite buffer nand %d(%d:%d) objid %d chId %d", chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk, tags.obj_id, tags.chunk_id); realigned_chunk = chunk - dev->chunk_offset; dev->n_page_writes++; dev->param.write_chunk_tags_fn(dev, realigned_chunk, dev->checkpt_buffer, &tags); dev->checkpt_page_seq++; dev->checkpt_cur_chunk++; if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) { dev->checkpt_cur_chunk = 0; dev->checkpt_cur_block = -1; } memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk); yaffs2_checkpt_init_chunk_hdr(dev); return 1; }
static void yaffs_handle_rd_data_error(yaffs_dev_t *dev, int nand_chunk) { int flash_block = nand_chunk / dev->param.chunks_per_block; /* Mark the block for retirement */ yaffs_get_block_info(dev, flash_block + dev->block_offset)->needs_retiring = 1; T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, (TSTR("**>>Block %d marked for retirement" TENDSTR), flash_block)); /* TODO: * Just do a garbage collection on the affected block * then retire the block * NB recursion */ }
void yaffs_summary_gc(struct yaffs_dev *dev, int blk) { struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk); int i; if (!bi->has_summary) return; for (i = dev->chunks_per_summary; i < dev->param.chunks_per_block; i++) { if (yaffs_check_chunk_bit(dev, blk, i)) { yaffs_clear_chunk_bit(dev, blk, i); bi->pages_in_use--; dev->n_free_chunks++; } } }
int yaffs_checkpt_close(struct yaffs_dev *dev) { if (dev->checkpt_open_write) { if (dev->checkpt_byte_offs != 0) yaffs2_checkpt_flush_buffer(dev); } else if (dev->checkpt_block_list) { int i; for (i = 0; i < dev->blocks_in_checkpt && dev->checkpt_block_list[i] >= 0; i++) { int blk = dev->checkpt_block_list[i]; struct yaffs_block_info *bi = NULL; if (dev->internal_start_block <= blk && blk <= dev->internal_end_block) bi = yaffs_get_block_info(dev, blk); if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY) bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT; else ; } kfree(dev->checkpt_block_list); dev->checkpt_block_list = NULL; } dev->n_free_chunks -= dev->blocks_in_checkpt * dev->param.chunks_per_block; dev->n_erased_blocks -= dev->blocks_in_checkpt; yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checkpoint byte count %d", dev->checkpt_byte_count); if (dev->checkpt_buffer) { /* free the buffer */ kfree(dev->checkpt_buffer); dev->checkpt_buffer = NULL; return 1; } else { return 0; } }
int yaffs_rd_chunk_tags_nand(struct yaffs_dev* dev, int nand_chunk, u8* buffer, struct yaffs_ext_tags* tags) { int result; struct yaffs_ext_tags local_tags; int flash_chunk = apply_chunk_offset(dev, nand_chunk); dev->n_page_reads++; /* If there are no tags provided use local tags. */ if (!tags) tags = &local_tags; result = dev->tagger.read_chunk_tags_fn(dev, flash_chunk, buffer, tags); if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) { struct yaffs_block_info* bi; bi = yaffs_get_block_info(dev, nand_chunk / dev->param.chunks_per_block); yaffs_handle_chunk_error(dev, bi); } return result; }
int yaffs_checkpt_close(yaffs_dev_t *dev) { if (dev->checkpt_open_write) { if (dev->checkpt_byte_offs != 0) yaffs2_checkpt_flush_buffer(dev); } else if(dev->checkpt_block_list){ int i; for (i = 0; i < dev->blocks_in_checkpt && dev->checkpt_block_list[i] >= 0; i++) { int blk = dev->checkpt_block_list[i]; yaffs_block_info_t *bi = NULL; if( dev->internal_start_block <= blk && blk <= dev->internal_end_block) bi = yaffs_get_block_info(dev, blk); if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY) bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT; else { /* Todo this looks odd... */ } } YFREE(dev->checkpt_block_list); dev->checkpt_block_list = NULL; } dev->n_free_chunks -= dev->blocks_in_checkpt * dev->param.chunks_per_block; dev->n_erased_blocks -= dev->blocks_in_checkpt; T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint byte count %d" TENDSTR), dev->checkpt_byte_count)); if (dev->checkpt_buffer) { /* free the buffer */ YFREE(dev->checkpt_buffer); dev->checkpt_buffer = NULL; return 1; } else return 0; }
static int yaffs_checkpt_erase(struct yaffs_dev *dev) { int i; if (!dev->param.erase_fn) return 0; yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checking blocks %d to %d", dev->internal_start_block, dev->internal_end_block); for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { struct yaffs_block_info *bi = yaffs_get_block_info(dev, i); int offset_i = apply_block_offset(dev, i); int result; if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) { yaffs_trace(YAFFS_TRACE_CHECKPOINT, "erasing checkpt block %d", i); dev->n_erasures++; result = dev->param.erase_fn(dev, offset_i); if(result) { bi->block_state = YAFFS_BLOCK_STATE_EMPTY; dev->n_erased_blocks++; dev->n_free_chunks += dev->param.chunks_per_block; } else { dev->param.bad_block_fn(dev, offset_i); bi->block_state = YAFFS_BLOCK_STATE_DEAD; } } } dev->blocks_in_checkpt = 0; return 1; }
int yaffs1_scan(struct yaffs_dev *dev) { struct yaffs_ext_tags tags; int blk; int result; int chunk; int c; int deleted; enum yaffs_block_state state; struct yaffs_obj *hard_list = NULL; struct yaffs_block_info *bi; u32 seq_number; struct yaffs_obj_hdr *oh; struct yaffs_obj *in; struct yaffs_obj *parent; int alloc_failed = 0; struct yaffs_shadow_fixer *shadow_fixers = NULL; u8 *chunk_data; yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan starts intstartblk %d intendblk %d...", dev->internal_start_block, dev->internal_end_block); chunk_data = yaffs_get_temp_buffer(dev, __LINE__); dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER; /* Scan all the blocks to determine their state */ bi = dev->block_info; for (blk = dev->internal_start_block; blk <= dev->internal_end_block; blk++) { yaffs_clear_chunk_bits(dev, blk); bi->pages_in_use = 0; bi->soft_del_pages = 0; yaffs_query_init_block_state(dev, blk, &state, &seq_number); bi->block_state = state; bi->seq_number = seq_number; if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK) bi->block_state = state = YAFFS_BLOCK_STATE_DEAD; yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block scanning block %d state %d seq %d", blk, state, seq_number); if (state == YAFFS_BLOCK_STATE_DEAD) { yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "block %d is bad", blk); } else if (state == YAFFS_BLOCK_STATE_EMPTY) { yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty "); dev->n_erased_blocks++; dev->n_free_chunks += dev->param.chunks_per_block; } bi++; } /* For each block.... */ for (blk = dev->internal_start_block; !alloc_failed && blk <= dev->internal_end_block; blk++) { cond_resched(); bi = yaffs_get_block_info(dev, blk); state = bi->block_state; deleted = 0; /* For each chunk in each block that needs scanning.... */ for (c = 0; !alloc_failed && c < dev->param.chunks_per_block && state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) { /* Read the tags and decide what to do */ chunk = blk * dev->param.chunks_per_block + c; result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags); /* Let's have a good look at this chunk... */ if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED || tags.is_deleted) { /* YAFFS1 only... * A deleted chunk */ deleted++; dev->n_free_chunks++; /*T((" %d %d deleted\n",blk,c)); */ } else if (!tags.chunk_used) { /* An unassigned chunk in the block * This means that either the block is empty or * this is the one being allocated from */ if (c == 0) { /* We're looking at the first chunk in the block so the block is unused */ state = YAFFS_BLOCK_STATE_EMPTY; dev->n_erased_blocks++; } else { /* this is the block being allocated from */ yaffs_trace(YAFFS_TRACE_SCAN, " Allocating from %d %d", blk, c); state = YAFFS_BLOCK_STATE_ALLOCATING; dev->alloc_block = blk; dev->alloc_page = c; dev->alloc_block_finder = blk; /* Set block finder here to encourage the allocator to go forth from here. */ } dev->n_free_chunks += (dev->param.chunks_per_block - c); } else if (tags.chunk_id > 0) { /* chunk_id > 0 so it is a data chunk... */ unsigned int endpos; yaffs_set_chunk_bit(dev, blk, c); bi->pages_in_use++; in = yaffs_find_or_create_by_number(dev, tags.obj_id, YAFFS_OBJECT_TYPE_FILE); /* PutChunkIntoFile checks for a clash (two data chunks with * the same chunk_id). */ if (!in) alloc_failed = 1; if (in) { if (!yaffs_put_chunk_in_file (in, tags.chunk_id, chunk, 1)) alloc_failed = 1; } endpos = (tags.chunk_id - 1) * dev->data_bytes_per_chunk + tags.n_bytes; if (in && in->variant_type == YAFFS_OBJECT_TYPE_FILE && in->variant.file_variant.scanned_size < endpos) { in->variant.file_variant.scanned_size = endpos; if (!dev->param.use_header_file_size) { in->variant. file_variant.file_size = in->variant. file_variant.scanned_size; } } /* T((" %d %d data %d %d\n",blk,c,tags.obj_id,tags.chunk_id)); */ } else { /* chunk_id == 0, so it is an ObjectHeader. * Thus, we read in the object header and make the object */ yaffs_set_chunk_bit(dev, blk, c); bi->pages_in_use++; result = yaffs_rd_chunk_tags_nand(dev, chunk, chunk_data, NULL); oh = (struct yaffs_obj_hdr *)chunk_data; in = yaffs_find_by_number(dev, tags.obj_id); if (in && in->variant_type != oh->type) { /* This should not happen, but somehow * Wev'e ended up with an obj_id that has been reused but not yet * deleted, and worse still it has changed type. Delete the old object. */ yaffs_del_obj(in); in = 0; } in = yaffs_find_or_create_by_number(dev, tags.obj_id, oh->type); if (!in) alloc_failed = 1; if (in && oh->shadows_obj > 0) { struct yaffs_shadow_fixer *fixer; fixer = kmalloc(sizeof (struct yaffs_shadow_fixer), GFP_NOFS); if (fixer) { fixer->next = shadow_fixers; shadow_fixers = fixer; fixer->obj_id = tags.obj_id; fixer->shadowed_id = oh->shadows_obj; yaffs_trace(YAFFS_TRACE_SCAN, " Shadow fixer: %d shadows %d", fixer->obj_id, fixer->shadowed_id); } } if (in && in->valid) { /* We have already filled this one. We have a duplicate and need to resolve it. */ unsigned existing_serial = in->serial; unsigned new_serial = tags.serial_number; if (((existing_serial + 1) & 3) == new_serial) { /* Use new one - destroy the exisiting one */ yaffs_chunk_del(dev, in->hdr_chunk, 1, __LINE__); in->valid = 0; } else { /* Use existing - destroy this one. */ yaffs_chunk_del(dev, chunk, 1, __LINE__); } } if (in && !in->valid && (tags.obj_id == YAFFS_OBJECTID_ROOT || tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND)) { /* We only load some info, don't fiddle with directory structure */ in->valid = 1; in->variant_type = oh->type; in->yst_mode = oh->yst_mode; yaffs_load_attribs(in, oh); in->hdr_chunk = chunk; in->serial = tags.serial_number; } else if (in && !in->valid) { /* we need to load this info */ in->valid = 1; in->variant_type = oh->type; in->yst_mode = oh->yst_mode; yaffs_load_attribs(in, oh); in->hdr_chunk = chunk; in->serial = tags.serial_number; yaffs_set_obj_name_from_oh(in, oh); in->dirty = 0; /* directory stuff... * hook up to parent */ parent = yaffs_find_or_create_by_number (dev, oh->parent_obj_id, YAFFS_OBJECT_TYPE_DIRECTORY); if (!parent) alloc_failed = 1; if (parent && parent->variant_type == YAFFS_OBJECT_TYPE_UNKNOWN) { /* Set up as a directory */ parent->variant_type = YAFFS_OBJECT_TYPE_DIRECTORY; INIT_LIST_HEAD(&parent-> variant.dir_variant.children); } else if (!parent || parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { /* Hoosterman, another problem.... * We're trying to use a non-directory as a directory */ yaffs_trace(YAFFS_TRACE_ERROR, "yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." ); parent = dev->lost_n_found; } yaffs_add_obj_to_dir(parent, in); if (0 && (parent == dev->del_dir || parent == dev->unlinked_dir)) { in->deleted = 1; /* If it is unlinked at start up then it wants deleting */ dev->n_deleted_files++; } /* Note re hardlinks. * Since we might scan a hardlink before its equivalent object is scanned * we put them all in a list. * After scanning is complete, we should have all the objects, so we run through this * list and fix up all the chains. */ switch (in->variant_type) { case YAFFS_OBJECT_TYPE_UNKNOWN: /* Todo got a problem */ break; case YAFFS_OBJECT_TYPE_FILE: if (dev->param. use_header_file_size) in->variant. file_variant.file_size = oh->file_size; break; case YAFFS_OBJECT_TYPE_HARDLINK: in->variant. hardlink_variant.equiv_id = oh->equiv_id; in->hard_links.next = (struct list_head *) hard_list; hard_list = in; break; case YAFFS_OBJECT_TYPE_DIRECTORY: /* Do nothing */ break; case YAFFS_OBJECT_TYPE_SPECIAL: /* Do nothing */ break; case YAFFS_OBJECT_TYPE_SYMLINK: in->variant.symlink_variant. alias = yaffs_clone_str(oh->alias); if (!in->variant. symlink_variant.alias) alloc_failed = 1; break; } } } } if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) { /* If we got this far while scanning, then the block is fully allocated. */ state = YAFFS_BLOCK_STATE_FULL; } if (state == YAFFS_BLOCK_STATE_ALLOCATING) { /* If the block was partially allocated then treat it as fully allocated. */ state = YAFFS_BLOCK_STATE_FULL; dev->alloc_block = -1; } bi->block_state = state; /* Now let's see if it was dirty */ if (bi->pages_in_use == 0 && !bi->has_shrink_hdr && bi->block_state == YAFFS_BLOCK_STATE_FULL) { yaffs_block_became_dirty(dev, blk); } } /* Ok, we've done all the scanning. * Fix up the hard link chains. * We should now have scanned all the objects, now it's time to add these * hardlinks. */ yaffs_link_fixup(dev, hard_list); /* Fix up any shadowed objects */ { struct yaffs_shadow_fixer *fixer; struct yaffs_obj *obj; while (shadow_fixers) { fixer = shadow_fixers; shadow_fixers = fixer->next; /* Complete the rename transaction by deleting the shadowed object * then setting the object header to unshadowed. */ obj = yaffs_find_by_number(dev, fixer->shadowed_id); if (obj) yaffs_del_obj(obj); obj = yaffs_find_by_number(dev, fixer->obj_id); if (obj) yaffs_update_oh(obj, NULL, 1, 0, 0, NULL); kfree(fixer); } } yaffs_release_temp_buffer(dev, chunk_data, __LINE__); if (alloc_failed) return YAFFS_FAIL; yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan ends"); return YAFFS_OK; }
int yaffs_summary_read(struct yaffs_dev *dev, struct yaffs_summary_tags *st, int blk) { struct yaffs_ext_tags tags; u8 *buffer; u8 *sum_buffer = (u8 *)st; int n_bytes; int chunk_id; int chunk_in_nand; int chunk_in_block; int result; int this_tx; struct yaffs_summary_header hdr; struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk); int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr); int sum_tags_bytes; sum_tags_bytes = sizeof(struct yaffs_summary_tags) * dev->chunks_per_summary; buffer = yaffs_get_temp_buffer(dev); n_bytes = sizeof(struct yaffs_summary_tags) * dev->chunks_per_summary; chunk_in_block = dev->chunks_per_summary; chunk_in_nand = blk * dev->param.chunks_per_block + dev->chunks_per_summary; chunk_id = 1; do { this_tx = n_bytes; if (this_tx > sum_bytes_per_chunk) this_tx = sum_bytes_per_chunk; result = yaffs_rd_chunk_tags_nand(dev, chunk_in_nand, buffer, &tags); if (tags.chunk_id != chunk_id || tags.obj_id != YAFFS_OBJECTID_SUMMARY || tags.chunk_used == 0 || tags.ecc_result > YAFFS_ECC_RESULT_FIXED || tags.n_bytes != (this_tx + sizeof(hdr))) result = YAFFS_FAIL; if (result != YAFFS_OK) break; if (st == dev->sum_tags) { /* If we're scanning then update the block info */ yaffs_set_chunk_bit(dev, blk, chunk_in_block); bi->pages_in_use++; } memcpy(&hdr, buffer, sizeof(hdr)); memcpy(sum_buffer, buffer + sizeof(hdr), this_tx); n_bytes -= this_tx; sum_buffer += this_tx; chunk_in_nand++; chunk_in_block++; chunk_id++; } while (result == YAFFS_OK && n_bytes > 0); yaffs_release_temp_buffer(dev, buffer); if (result == YAFFS_OK) { /* Verify header */ if (hdr.version != YAFFS_SUMMARY_VERSION || hdr.block != blk || hdr.seq != bi->seq_number || hdr.sum != yaffs_summary_sum(dev)) result = YAFFS_FAIL; } if (st == dev->sum_tags && result == YAFFS_OK) bi->has_summary = 1; return result; }