X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=blobdiff_plain;f=yaffs_guts.c;h=15d0238ba8c76757fb9483b82a38a7a119a5d357;hp=c56e060ef5bc384e231eadb49bd484991d221492;hb=fb1a7ee223619260cfd9b6366fd78747cc572cd5;hpb=84f122f301b6a27295641fcbde3a6fbcfea78a99 diff --git a/yaffs_guts.c b/yaffs_guts.c index c56e060..15d0238 100644 --- a/yaffs_guts.c +++ b/yaffs_guts.c @@ -41,62 +41,13 @@ #include "yaffs_ecc.h" -/* Robustification (if it ever comes about...) */ -static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block); -static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk, - int erased_ok); -static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk, - const u8 * data, - const struct yaffs_ext_tags *tags); -static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk, - const struct yaffs_ext_tags *tags); - -/* Other local prototypes */ -static void yaffs_update_parent(struct yaffs_obj *obj); -static int yaffs_unlink_obj(struct yaffs_obj *obj); -static int yaffs_obj_cache_dirty(struct yaffs_obj *obj); - -static int yaffs_write_new_chunk(struct yaffs_dev *dev, - const u8 * buffer, - struct yaffs_ext_tags *tags, int use_reserver); - -static struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number, - enum yaffs_obj_type type); - -static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer, - struct yaffs_xattr_mod *xmod); - -static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj); -static int yaffs_generic_obj_del(struct yaffs_obj *in); - -static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk); - -static int yaffs_unlink_worker(struct yaffs_obj *obj); - -static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id, - int chunk_obj); - -static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver, - struct yaffs_block_info **block_ptr); - -static void yaffs_check_obj_details_loaded(struct yaffs_obj *in); +/* Forward declarations */ -static void yaffs_invalidate_whole_cache(struct yaffs_obj *in); -static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, - int chunk_id); -static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk, - struct yaffs_ext_tags *tags); +static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk, + const u8 * buffer, int n_bytes, int use_reserve); -static int yaffs_verify_chunk_written(struct yaffs_dev *dev, - int nand_chunk, - const u8 * data, - struct yaffs_ext_tags *tags); -static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR * name, - const YCHAR * oh_name, int buff_size); -static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR * oh_name, - const YCHAR * name); /* Function to calculate chunk and offset */ @@ -186,7 +137,7 @@ static int yaffs_init_tmp_buffers(struct yaffs_dev *dev) for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) { dev->temp_buffer[i].line = 0; /* not in use */ dev->temp_buffer[i].buffer = buf = - YMALLOC_DMA(dev->param.total_bytes_per_chunk); + kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS); } return buf ? YAFFS_OK : YAFFS_FAIL; @@ -229,7 +180,7 @@ u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev, int line_no) */ dev->unmanaged_buffer_allocs++; - return YMALLOC(dev->data_bytes_per_chunk); + return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS); } @@ -251,7 +202,7 @@ void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 * buffer, int line_no) T(YAFFS_TRACE_BUFFERS, (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR), line_no)); - YFREE(buffer); + kfree(buffer); dev->unmanaged_buffer_deallocs++; } @@ -282,6 +233,66 @@ int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 * buffer) return 0; } +/* + * Functions for robustisizing TODO + * + */ + +static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk, + const u8 * data, + const struct yaffs_ext_tags *tags) +{ + dev = dev; + nand_chunk = nand_chunk; + data = data; + tags = tags; +} + +static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk, + const struct yaffs_ext_tags *tags) +{ + dev = dev; + nand_chunk = nand_chunk; + tags = tags; +} + +void yaffs_handle_chunk_error(struct yaffs_dev *dev, + struct yaffs_block_info *bi) +{ + if (!bi->gc_prioritise) { + bi->gc_prioritise = 1; + dev->has_pending_prioritised_gc = 1; + bi->chunk_error_strikes++; + + if (bi->chunk_error_strikes > 3) { + bi->needs_retiring = 1; /* Too many stikes, so retire this */ + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: Block struck out" TENDSTR))); + + } + } +} + +static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk, + int erased_ok) +{ + int flash_block = nand_chunk / dev->param.chunks_per_block; + struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block); + + yaffs_handle_chunk_error(dev, bi); + + if (erased_ok) { + /* Was an actual write failure, so mark the block for retirement */ + bi->needs_retiring = 1; + T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + (TSTR("**>> Block %d needs retiring" TENDSTR), flash_block)); + } + + /* Delete the chunk */ + yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); + yaffs_skip_rest_of_block(dev); +} + /* * Verification code */ @@ -372,6 +383,150 @@ static int yaffs_verify_chunk_written(struct yaffs_dev *dev, return retval; } + +int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks) +{ + int reserved_chunks; + int reserved_blocks = dev->param.n_reserved_blocks; + int checkpt_blocks; + + checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev); + + reserved_chunks = + ((reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block); + + return (dev->n_free_chunks > (reserved_chunks + n_chunks)); +} + +static int yaffs_find_alloc_block(struct yaffs_dev *dev) +{ + int i; + + struct yaffs_block_info *bi; + + if (dev->n_erased_blocks < 1) { + /* Hoosterman we've got a problem. + * Can't get space to gc + */ + T(YAFFS_TRACE_ERROR, + (TSTR("yaffs tragedy: no more erased blocks" TENDSTR))); + + return -1; + } + + /* Find an empty block. */ + + for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { + dev->alloc_block_finder++; + if (dev->alloc_block_finder < dev->internal_start_block + || dev->alloc_block_finder > dev->internal_end_block) { + dev->alloc_block_finder = dev->internal_start_block; + } + + bi = yaffs_get_block_info(dev, dev->alloc_block_finder); + + if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { + bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING; + dev->seq_number++; + bi->seq_number = dev->seq_number; + dev->n_erased_blocks--; + T(YAFFS_TRACE_ALLOCATE, + (TSTR("Allocated block %d, seq %d, %d left" TENDSTR), + dev->alloc_block_finder, dev->seq_number, + dev->n_erased_blocks)); + return dev->alloc_block_finder; + } + } + + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("yaffs tragedy: no more erased blocks, but there should have been %d" + TENDSTR), dev->n_erased_blocks)); + + return -1; +} +static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver, + struct yaffs_block_info **block_ptr) +{ + int ret_val; + struct yaffs_block_info *bi; + + if (dev->alloc_block < 0) { + /* Get next block to allocate off */ + dev->alloc_block = yaffs_find_alloc_block(dev); + dev->alloc_page = 0; + } + + if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) { + /* Not enough space to allocate unless we're allowed to use the reserve. */ + return -1; + } + + if (dev->n_erased_blocks < dev->param.n_reserved_blocks + && dev->alloc_page == 0) { + T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR))); + } + + /* Next page please.... */ + if (dev->alloc_block >= 0) { + bi = yaffs_get_block_info(dev, dev->alloc_block); + + ret_val = (dev->alloc_block * dev->param.chunks_per_block) + + dev->alloc_page; + bi->pages_in_use++; + yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page); + + dev->alloc_page++; + + dev->n_free_chunks--; + + /* If the block is full set the state to full */ + if (dev->alloc_page >= dev->param.chunks_per_block) { + bi->block_state = YAFFS_BLOCK_STATE_FULL; + dev->alloc_block = -1; + } + + if (block_ptr) + *block_ptr = bi; + + return ret_val; + } + + T(YAFFS_TRACE_ERROR, + (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR))); + + return -1; +} + +static int yaffs_get_erased_chunks(struct yaffs_dev *dev) +{ + int n; + + n = dev->n_erased_blocks * dev->param.chunks_per_block; + + if (dev->alloc_block > 0) + n += (dev->param.chunks_per_block - dev->alloc_page); + + return n; + +} + +/* + * yaffs_skip_rest_of_block() skips over the rest of the allocation block + * if we don't want to write to it. + */ +void yaffs_skip_rest_of_block(struct yaffs_dev *dev) +{ + if (dev->alloc_block > 0) { + struct yaffs_block_info *bi = + yaffs_get_block_info(dev, dev->alloc_block); + if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) { + bi->block_state = YAFFS_BLOCK_STATE_FULL; + dev->alloc_block = -1; + } + } +} + static int yaffs_write_new_chunk(struct yaffs_dev *dev, const u8 * data, struct yaffs_ext_tags *tags, int use_reserver) @@ -522,76 +677,16 @@ static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block) dev->n_retired_blocks++; } -/* - * Functions for robustisizing TODO - * - */ +/*---------------- Name handling functions ------------*/ -static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk, - const u8 * data, - const struct yaffs_ext_tags *tags) +static u16 yaffs_calc_name_sum(const YCHAR * name) { - dev = dev; - nand_chunk = nand_chunk; - data = data; - tags = tags; -} + u16 sum = 0; + u16 i = 1; -static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk, - const struct yaffs_ext_tags *tags) -{ - dev = dev; - nand_chunk = nand_chunk; - tags = tags; -} - -void yaffs_handle_chunk_error(struct yaffs_dev *dev, - struct yaffs_block_info *bi) -{ - if (!bi->gc_prioritise) { - bi->gc_prioritise = 1; - dev->has_pending_prioritised_gc = 1; - bi->chunk_error_strikes++; - - if (bi->chunk_error_strikes > 3) { - bi->needs_retiring = 1; /* Too many stikes, so retire this */ - T(YAFFS_TRACE_ALWAYS, - (TSTR("yaffs: Block struck out" TENDSTR))); - - } - } -} - -static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk, - int erased_ok) -{ - int flash_block = nand_chunk / dev->param.chunks_per_block; - struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block); - - yaffs_handle_chunk_error(dev, bi); - - if (erased_ok) { - /* Was an actual write failure, so mark the block for retirement */ - bi->needs_retiring = 1; - T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, - (TSTR("**>> Block %d needs retiring" TENDSTR), flash_block)); - } - - /* Delete the chunk */ - yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); - yaffs_skip_rest_of_block(dev); -} - -/*---------------- Name handling functions ------------*/ - -static u16 yaffs_calc_name_sum(const YCHAR * name) -{ - u16 sum = 0; - u16 i = 1; - - const YUCHAR *bname = (const YUCHAR *)name; - if (bname) { - while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH / 2))) { + const YUCHAR *bname = (const YUCHAR *)name; + if (bname) { + while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH / 2))) { /* 0x1f mask is case insensitive */ sum += ((*bname) & 0x1f) * i; @@ -607,9 +702,9 @@ void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name) #ifndef CONFIG_YAFFS_NO_SHORT_NAMES memset(obj->short_name, 0, sizeof(obj->short_name)); if (name && - yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <= + strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <= YAFFS_SHORT_NAME_LENGTH) - yaffs_strcpy(obj->short_name, name); + strcpy(obj->short_name, name); else obj->short_name[0] = _Y('\0'); #endif @@ -884,6 +979,14 @@ struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev, return tn; } +static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id, + int chunk_obj) +{ + return (tags->chunk_id == chunk_obj && + tags->obj_id == obj_id && !tags->is_deleted) ? 1 : 0; + +} + static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk, struct yaffs_ext_tags *tags, int obj_id, int inode_chunk) @@ -911,6 +1014,194 @@ static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk, return -1; } +static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk, + struct yaffs_ext_tags *tags) +{ + /*Get the Tnode, then get the level 0 offset chunk offset */ + struct yaffs_tnode *tn; + int the_chunk = -1; + struct yaffs_ext_tags local_tags; + int ret_val = -1; + + struct yaffs_dev *dev = in->my_dev; + + if (!tags) { + /* Passed a NULL, so use our own tags space */ + tags = &local_tags; + } + + tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk); + + if (tn) { + the_chunk = yaffs_get_group_base(dev, tn, inode_chunk); + + ret_val = + yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id, + inode_chunk); + } + return ret_val; +} + +static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk, + struct yaffs_ext_tags *tags) +{ + /* Get the Tnode, then get the level 0 offset chunk offset */ + struct yaffs_tnode *tn; + int the_chunk = -1; + struct yaffs_ext_tags local_tags; + + struct yaffs_dev *dev = in->my_dev; + int ret_val = -1; + + if (!tags) { + /* Passed a NULL, so use our own tags space */ + tags = &local_tags; + } + + tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk); + + if (tn) { + + the_chunk = yaffs_get_group_base(dev, tn, inode_chunk); + + ret_val = + yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id, + inode_chunk); + + /* Delete the entry in the filestructure (if found) */ + if (ret_val != -1) + yaffs_load_tnode_0(dev, tn, inode_chunk, 0); + } + + return ret_val; +} + +int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk, + int nand_chunk, int in_scan) +{ + /* NB in_scan is zero unless scanning. + * For forward scanning, in_scan is > 0; + * for backward scanning in_scan is < 0 + * + * nand_chunk = 0 is a dummy insert to make sure the tnodes are there. + */ + + struct yaffs_tnode *tn; + struct yaffs_dev *dev = in->my_dev; + int existing_cunk; + struct yaffs_ext_tags existing_tags; + struct yaffs_ext_tags new_tags; + unsigned existing_serial, new_serial; + + if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) { + /* Just ignore an attempt at putting a chunk into a non-file during scanning + * If it is not during Scanning then something went wrong! + */ + if (!in_scan) { + T(YAFFS_TRACE_ERROR, + (TSTR + ("yaffs tragedy:attempt to put data chunk into a non-file" + TENDSTR))); + YBUG(); + } + + yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); + return YAFFS_OK; + } + + tn = yaffs_add_find_tnode_0(dev, + &in->variant.file_variant, + inode_chunk, NULL); + if (!tn) + return YAFFS_FAIL; + + if (!nand_chunk) + /* Dummy insert, bail now */ + return YAFFS_OK; + + existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk); + + if (in_scan != 0) { + /* If we're scanning then we need to test for duplicates + * NB This does not need to be efficient since it should only ever + * happen when the power fails during a write, then only one + * chunk should ever be affected. + * + * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO + * Update: For backward scanning we don't need to re-read tags so this is quite cheap. + */ + + if (existing_cunk > 0) { + /* NB Right now existing chunk will not be real chunk_id if the chunk group size > 1 + * thus we have to do a FindChunkInFile to get the real chunk id. + * + * We have a duplicate now we need to decide which one to use: + * + * Backwards scanning YAFFS2: The old one is what we use, dump the new one. + * Forward scanning YAFFS2: The new one is what we use, dump the old one. + * YAFFS1: Get both sets of tags and compare serial numbers. + */ + + if (in_scan > 0) { + /* Only do this for forward scanning */ + yaffs_rd_chunk_tags_nand(dev, + nand_chunk, + NULL, &new_tags); + + /* Do a proper find */ + existing_cunk = + yaffs_find_chunk_in_file(in, inode_chunk, + &existing_tags); + } + + if (existing_cunk <= 0) { + /*Hoosterman - how did this happen? */ + + T(YAFFS_TRACE_ERROR, + (TSTR + ("yaffs tragedy: existing chunk < 0 in scan" + TENDSTR))); + + } + + /* NB The deleted flags should be false, otherwise the chunks will + * not be loaded during a scan + */ + + if (in_scan > 0) { + new_serial = new_tags.serial_number; + existing_serial = existing_tags.serial_number; + } + + if ((in_scan > 0) && + (existing_cunk <= 0 || + ((existing_serial + 1) & 3) == new_serial)) { + /* Forward scanning. + * Use new + * Delete the old one and drop through to update the tnode + */ + yaffs_chunk_del(dev, existing_cunk, 1, + __LINE__); + } else { + /* Backward scanning or we want to use the existing one + * Use existing. + * Delete the new one and return early so that the tnode isn't changed + */ + yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); + return YAFFS_OK; + } + } + + } + + if (existing_cunk == 0) + in->n_data_chunks++; + + yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk); + + return YAFFS_OK; +} + static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk) { struct yaffs_block_info *the_block; @@ -991,1075 +1282,1258 @@ static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn, } -static void yaffs_soft_del_file(struct yaffs_obj *obj) +static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj) { - if (obj->deleted && - obj->variant_type == YAFFS_OBJECT_TYPE_FILE && !obj->soft_del) { - if (obj->n_data_chunks <= 0) { - /* Empty file with no duplicate object headers, just delete it immediately */ - yaffs_free_tnode(obj->my_dev, - obj->variant.file_variant.top); - obj->variant.file_variant.top = NULL; - T(YAFFS_TRACE_TRACING, - (TSTR("yaffs: Deleting empty file %d" TENDSTR), - obj->obj_id)); - yaffs_generic_obj_del(obj); - } else { - yaffs_soft_del_worker(obj, - obj->variant.file_variant.top, - obj->variant. - file_variant.top_level, 0); - obj->soft_del = 1; - } - } -} - -/* Pruning removes any part of the file structure tree that is beyond the - * bounds of the file (ie that does not point to chunks). - * - * A file should only get pruned when its size is reduced. - * - * Before pruning, the chunks must be pulled from the tree and the - * level 0 tnode entries must be zeroed out. - * Could also use this for file deletion, but that's probably better handled - * by a special case. - * - * This function is recursive. For levels > 0 the function is called again on - * any sub-tree. For level == 0 we just check if the sub-tree has data. - * If there is no data in a subtree then it is pruned. - */ - -static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev, - struct yaffs_tnode *tn, u32 level, - int del0) -{ - int i; - int has_data; - - if (tn) { - has_data = 0; - - if (level > 0) { - for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) { - if (tn->internal[i]) { - tn->internal[i] = - yaffs_prune_worker(dev, - tn->internal[i], - level - 1, - (i == - 0) ? del0 : 1); - } - - if (tn->internal[i]) - has_data++; - } - } else { - int tnode_size_u32 = dev->tnode_size / sizeof(u32); - u32 *map = (u32 *) tn; - - for (i = 0; !has_data && i < tnode_size_u32; i++) { - if (map[i]) - has_data++; - } - } + struct yaffs_dev *dev = obj->my_dev; + struct yaffs_obj *parent; - if (has_data == 0 && del0) { - /* Free and return NULL */ + yaffs_verify_obj_in_dir(obj); + parent = obj->parent; - yaffs_free_tnode(dev, tn); - tn = NULL; - } + yaffs_verify_dir(parent); - } + if (dev && dev->param.remove_obj_fn) + dev->param.remove_obj_fn(obj); - return tn; + list_del_init(&obj->siblings); + obj->parent = NULL; + yaffs_verify_dir(parent); } -static int yaffs_prune_tree(struct yaffs_dev *dev, - struct yaffs_file_var *file_struct) +void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj) { - int i; - int has_data; - int done = 0; - struct yaffs_tnode *tn; + if (!directory) { + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("tragedy: Trying to add an object to a null pointer directory" + TENDSTR))); + YBUG(); + return; + } + if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("tragedy: Trying to add an object to a non-directory" + TENDSTR))); + YBUG(); + } - if (file_struct->top_level > 0) { - file_struct->top = - yaffs_prune_worker(dev, file_struct->top, - file_struct->top_level, 0); + if (obj->siblings.prev == NULL) { + /* Not initialised */ + YBUG(); + } - /* Now we have a tree with all the non-zero branches NULL but the height - * is the same as it was. - * Let's see if we can trim internal tnodes to shorten the tree. - * We can do this if only the 0th element in the tnode is in use - * (ie all the non-zero are NULL) - */ + yaffs_verify_dir(directory); - while (file_struct->top_level && !done) { - tn = file_struct->top; + yaffs_remove_obj_from_dir(obj); - has_data = 0; - for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) { - if (tn->internal[i]) - has_data++; - } + /* Now add it */ + list_add(&obj->siblings, &directory->variant.dir_variant.children); + obj->parent = directory; - if (!has_data) { - file_struct->top = tn->internal[0]; - file_struct->top_level--; - yaffs_free_tnode(dev, tn); - } else { - done = 1; - } - } + if (directory == obj->my_dev->unlinked_dir + || directory == obj->my_dev->del_dir) { + obj->unlinked = 1; + obj->my_dev->n_unlinked_files++; + obj->rename_allowed = 0; } - return YAFFS_OK; + yaffs_verify_dir(directory); + yaffs_verify_obj_in_dir(obj); } -/*-------------------- End of File Structure functions.-------------------*/ - -/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */ -static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev) +static int yaffs_change_obj_name(struct yaffs_obj *obj, + struct yaffs_obj *new_dir, + const YCHAR * new_name, int force, int shadows) { - struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev); - - if (obj) { - dev->n_obj++; + int unlink_op; + int del_op; - /* Now sweeten it up... */ + struct yaffs_obj *existing_target; - memset(obj, 0, sizeof(struct yaffs_obj)); - obj->being_created = 1; + if (new_dir == NULL) + new_dir = obj->parent; /* use the old directory */ - obj->my_dev = dev; - obj->hdr_chunk = 0; - obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN; - INIT_LIST_HEAD(&(obj->hard_links)); - INIT_LIST_HEAD(&(obj->hash_link)); - INIT_LIST_HEAD(&obj->siblings); + if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { + T(YAFFS_TRACE_ALWAYS, + (TSTR + ("tragedy: yaffs_change_obj_name: new_dir is not a directory" + TENDSTR))); + YBUG(); + } - /* Now make the directory sane */ - if (dev->root_dir) { - obj->parent = dev->root_dir; - list_add(&(obj->siblings), - &dev->root_dir->variant.dir_variant.children); - } + /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */ + if (obj->my_dev->param.is_yaffs2) + unlink_op = (new_dir == obj->my_dev->unlinked_dir); + else + unlink_op = (new_dir == obj->my_dev->unlinked_dir + && obj->variant_type == YAFFS_OBJECT_TYPE_FILE); - /* Add it to the lost and found directory. - * NB Can't put root or lost-n-found in lost-n-found so - * check if lost-n-found exists first - */ - if (dev->lost_n_found) - yaffs_add_obj_to_dir(dev->lost_n_found, obj); + del_op = (new_dir == obj->my_dev->del_dir); - obj->being_created = 0; - } + existing_target = yaffs_find_by_name(new_dir, new_name); - dev->checkpoint_blocks_required = 0; /* force recalculation */ + /* If the object is a file going into the unlinked directory, + * then it is OK to just stuff it in since duplicate names are allowed. + * else only proceed if the new name does not exist and if we're putting + * it into a directory. + */ + if ((unlink_op || + del_op || + force || + (shadows > 0) || + !existing_target) && + new_dir->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) { + yaffs_set_obj_name(obj, new_name); + obj->dirty = 1; - return obj; -} + yaffs_add_obj_to_dir(new_dir, obj); -static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev, - int number, u32 mode) -{ + if (unlink_op) + obj->unlinked = 1; - struct yaffs_obj *obj = - yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY); - if (obj) { - obj->fake = 1; /* it is fake so it might have no NAND presence... */ - obj->rename_allowed = 0; /* ... and we're not allowed to rename it... */ - obj->unlink_allowed = 0; /* ... or unlink it */ - obj->deleted = 0; - obj->unlinked = 0; - obj->yst_mode = mode; - obj->my_dev = dev; - obj->hdr_chunk = 0; /* Not a valid chunk. */ + /* If it is a deletion then we mark it as a shrink for gc purposes. */ + if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= + 0) + return YAFFS_OK; } - return obj; - + return YAFFS_FAIL; } -static void yaffs_unhash_obj(struct yaffs_obj *obj) +/*------------------------ Short Operations Cache ---------------------------------------- + * In many situations where there is no high level buffering a lot of + * reads might be short sequential reads, and a lot of writes may be short + * sequential writes. eg. scanning/writing a jpeg file. + * In these cases, a short read/write cache can provide a huge perfomance + * benefit with dumb-as-a-rock code. + * In Linux, the page cache provides read buffering and the short op cache + * provides write buffering. + * + * There are a limited number (~10) of cache chunks per device so that we don't + * need a very intelligent search. + */ + +static int yaffs_obj_cache_dirty(struct yaffs_obj *obj) { - int bucket; struct yaffs_dev *dev = obj->my_dev; + int i; + struct yaffs_cache *cache; + int n_caches = obj->my_dev->param.n_caches; - /* If it is still linked into the bucket list, free from the list */ - if (!list_empty(&obj->hash_link)) { - list_del_init(&obj->hash_link); - bucket = yaffs_hash_fn(obj->obj_id); - dev->obj_bucket[bucket].count--; + for (i = 0; i < n_caches; i++) { + cache = &dev->cache[i]; + if (cache->object == obj && cache->dirty) + return 1; } + + return 0; } -/* FreeObject frees up a Object and puts it back on the free list */ -static void yaffs_free_obj(struct yaffs_obj *obj) +static void yaffs_flush_file_cache(struct yaffs_obj *obj) { struct yaffs_dev *dev = obj->my_dev; + int lowest = -99; /* Stop compiler whining. */ + int i; + struct yaffs_cache *cache; + int chunk_written = 0; + int n_caches = obj->my_dev->param.n_caches; - T(YAFFS_TRACE_OS, - (TSTR("FreeObject %p inode %p" TENDSTR), obj, obj->my_inode)); + if (n_caches > 0) { + do { + cache = NULL; - if (!obj) - YBUG(); - if (obj->parent) - YBUG(); - if (!list_empty(&obj->siblings)) - YBUG(); + /* Find the dirty cache for this object with the lowest chunk id. */ + for (i = 0; i < n_caches; i++) { + if (dev->cache[i].object == obj && + dev->cache[i].dirty) { + if (!cache + || dev->cache[i].chunk_id < + lowest) { + cache = &dev->cache[i]; + lowest = cache->chunk_id; + } + } + } - if (obj->my_inode) { - /* We're still hooked up to a cached inode. - * Don't delete now, but mark for later deletion - */ - obj->defered_free = 1; - return; - } + if (cache && !cache->locked) { + /* Write it out and free it up */ - yaffs_unhash_obj(obj); + chunk_written = + yaffs_wr_data_obj(cache->object, + cache->chunk_id, + cache->data, + cache->n_bytes, 1); + cache->dirty = 0; + cache->object = NULL; + } - yaffs_free_raw_obj(dev, obj); - dev->n_obj--; - dev->checkpoint_blocks_required = 0; /* force recalculation */ -} + } while (cache && chunk_written > 0); + + if (cache) { + /* Hoosterman, disk full while writing cache out. */ + T(YAFFS_TRACE_ERROR, + (TSTR + ("yaffs tragedy: no space during cache write" + TENDSTR))); + + } + } -void yaffs_handle_defered_free(struct yaffs_obj *obj) -{ - if (obj->defered_free) - yaffs_free_obj(obj); } -static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev) +/*yaffs_flush_whole_cache(dev) + * + * + */ + +void yaffs_flush_whole_cache(struct yaffs_dev *dev) { + struct yaffs_obj *obj; + int n_caches = dev->param.n_caches; int i; - dev->n_obj = 0; - dev->n_tnodes = 0; + /* Find a dirty object in the cache and flush it... + * until there are no further dirty objects. + */ + do { + obj = NULL; + for (i = 0; i < n_caches && !obj; i++) { + if (dev->cache[i].object && dev->cache[i].dirty) + obj = dev->cache[i].object; - yaffs_init_raw_tnodes_and_objs(dev); + } + if (obj) + yaffs_flush_file_cache(obj); + + } while (obj); - for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { - INIT_LIST_HEAD(&dev->obj_bucket[i].list); - dev->obj_bucket[i].count = 0; - } } -static int yaffs_find_nice_bucket(struct yaffs_dev *dev) +/* Grab us a cache chunk for use. + * First look for an empty one. + * Then look for the least recently used non-dirty one. + * Then look for the least recently used dirty one...., flush and look again. + */ +static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev) { int i; - int l = 999; - int lowest = 999999; - - /* Search for the shortest list or one that - * isn't too long. - */ - for (i = 0; i < 10 && lowest > 4; i++) { - dev->bucket_finder++; - dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS; - if (dev->obj_bucket[dev->bucket_finder].count < lowest) { - lowest = dev->obj_bucket[dev->bucket_finder].count; - l = dev->bucket_finder; + if (dev->param.n_caches > 0) { + for (i = 0; i < dev->param.n_caches; i++) { + if (!dev->cache[i].object) + return &dev->cache[i]; } - } - return l; + return NULL; } -static int yaffs_new_obj_id(struct yaffs_dev *dev) +static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev) { - int bucket = yaffs_find_nice_bucket(dev); + struct yaffs_cache *cache; + struct yaffs_obj *the_obj; + int usage; + int i; + int pushout; - /* Now find an object value that has not already been taken - * by scanning the list. - */ + if (dev->param.n_caches > 0) { + /* Try find a non-dirty one... */ - int found = 0; - struct list_head *i; + cache = yaffs_grab_chunk_worker(dev); - u32 n = (u32) bucket; + if (!cache) { + /* They were all dirty, find the last recently used object and flush + * its cache, then find again. + * NB what's here is not very accurate, we actually flush the object + * the last recently used page. + */ - /* yaffs_check_obj_hash_sane(); */ + /* With locking we can't assume we can use entry zero */ - while (!found) { - found = 1; - n += YAFFS_NOBJECT_BUCKETS; - if (1 || dev->obj_bucket[bucket].count > 0) { - list_for_each(i, &dev->obj_bucket[bucket].list) { - /* If there is already one in the list */ - if (i && list_entry(i, struct yaffs_obj, - hash_link)->obj_id == n) { - found = 0; + the_obj = NULL; + usage = -1; + cache = NULL; + pushout = -1; + + for (i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].object && + !dev->cache[i].locked && + (dev->cache[i].last_use < usage + || !cache)) { + usage = dev->cache[i].last_use; + the_obj = dev->cache[i].object; + cache = &dev->cache[i]; + pushout = i; } } - } - } - return n; -} - -static void yaffs_hash_obj(struct yaffs_obj *in) -{ - int bucket = yaffs_hash_fn(in->obj_id); - struct yaffs_dev *dev = in->my_dev; + if (!cache || cache->dirty) { + /* Flush and try again */ + yaffs_flush_file_cache(the_obj); + cache = yaffs_grab_chunk_worker(dev); + } - list_add(&in->hash_link, &dev->obj_bucket[bucket].list); - dev->obj_bucket[bucket].count++; + } + return cache; + } else { + return NULL; + } } -struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number) +/* Find a cached chunk */ +static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj, + int chunk_id) { - int bucket = yaffs_hash_fn(number); - struct list_head *i; - struct yaffs_obj *in; - - list_for_each(i, &dev->obj_bucket[bucket].list) { - /* Look if it is in the list */ - if (i) { - in = list_entry(i, struct yaffs_obj, hash_link); - if (in->obj_id == number) { - - /* Don't tell the VFS about this one if it is defered free */ - if (in->defered_free) - return NULL; + struct yaffs_dev *dev = obj->my_dev; + int i; + if (dev->param.n_caches > 0) { + for (i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].object == obj && + dev->cache[i].chunk_id == chunk_id) { + dev->cache_hits++; - return in; + return &dev->cache[i]; } } } - return NULL; } -struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number, - enum yaffs_obj_type type) +/* Mark the chunk for the least recently used algorithym */ +static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache, + int is_write) { - struct yaffs_obj *the_obj = NULL; - struct yaffs_tnode *tn = NULL; - if (number < 0) - number = yaffs_new_obj_id(dev); + if (dev->param.n_caches > 0) { + if (dev->cache_last_use < 0 || dev->cache_last_use > 100000000) { + /* Reset the cache usages */ + int i; + for (i = 1; i < dev->param.n_caches; i++) + dev->cache[i].last_use = 0; - if (type == YAFFS_OBJECT_TYPE_FILE) { - tn = yaffs_get_tnode(dev); - if (!tn) - return NULL; - } + dev->cache_last_use = 0; + } - the_obj = yaffs_alloc_empty_obj(dev); - if (!the_obj) { - if (tn) - yaffs_free_tnode(dev, tn); - return NULL; - } + dev->cache_last_use++; - if (the_obj) { - the_obj->fake = 0; - the_obj->rename_allowed = 1; - the_obj->unlink_allowed = 1; - the_obj->obj_id = number; - yaffs_hash_obj(the_obj); - the_obj->variant_type = type; - yaffs_load_current_time(the_obj, 1, 1); + cache->last_use = dev->cache_last_use; - switch (type) { - case YAFFS_OBJECT_TYPE_FILE: - the_obj->variant.file_variant.file_size = 0; - the_obj->variant.file_variant.scanned_size = 0; - the_obj->variant.file_variant.shrink_size = ~0; /* max */ - the_obj->variant.file_variant.top_level = 0; - the_obj->variant.file_variant.top = tn; - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - INIT_LIST_HEAD(&the_obj->variant.dir_variant.children); - INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty); - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - case YAFFS_OBJECT_TYPE_HARDLINK: - case YAFFS_OBJECT_TYPE_SPECIAL: - /* No action required */ - break; - case YAFFS_OBJECT_TYPE_UNKNOWN: - /* todo this should not happen */ - break; - } + if (is_write) + cache->dirty = 1; } - - return the_obj; } -struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev, - int number, - enum yaffs_obj_type type) +/* Invalidate a single cache page. + * Do this when a whole page gets written, + * ie the short cache for this page is no longer valid. + */ +static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id) { - struct yaffs_obj *the_obj = NULL; - - if (number > 0) - the_obj = yaffs_find_by_number(dev, number); + if (object->my_dev->param.n_caches > 0) { + struct yaffs_cache *cache = + yaffs_find_chunk_cache(object, chunk_id); - if (!the_obj) - the_obj = yaffs_new_obj(dev, number, type); + if (cache) + cache->object = NULL; + } +} - return the_obj; +/* Invalidate all the cache pages associated with this object + * Do this whenever ther file is deleted or resized. + */ +static void yaffs_invalidate_whole_cache(struct yaffs_obj *in) +{ + int i; + struct yaffs_dev *dev = in->my_dev; + if (dev->param.n_caches > 0) { + /* Invalidate it. */ + for (i = 0; i < dev->param.n_caches; i++) { + if (dev->cache[i].object == in) + dev->cache[i].object = NULL; + } + } } -YCHAR *yaffs_clone_str(const YCHAR * str) +static void yaffs_unhash_obj(struct yaffs_obj *obj) { - YCHAR *new_str = NULL; - int len; - - if (!str) - str = _Y(""); + int bucket; + struct yaffs_dev *dev = obj->my_dev; - len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH); - new_str = YMALLOC((len + 1) * sizeof(YCHAR)); - if (new_str) { - yaffs_strncpy(new_str, str, len); - new_str[len] = 0; + /* If it is still linked into the bucket list, free from the list */ + if (!list_empty(&obj->hash_link)) { + list_del_init(&obj->hash_link); + bucket = yaffs_hash_fn(obj->obj_id); + dev->obj_bucket[bucket].count--; } - return new_str; - } -/* - * Mknod (create) a new object. - * equiv_obj only has meaning for a hard link; - * alias_str only has meaning for a symlink. - * rdev only has meaning for devices (a subset of special objects) - */ - -static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type, - struct yaffs_obj *parent, - const YCHAR * name, - u32 mode, - u32 uid, - u32 gid, - struct yaffs_obj *equiv_obj, - const YCHAR * alias_str, u32 rdev) +/* FreeObject frees up a Object and puts it back on the free list */ +static void yaffs_free_obj(struct yaffs_obj *obj) { - struct yaffs_obj *in; - YCHAR *str = NULL; + struct yaffs_dev *dev = obj->my_dev; - struct yaffs_dev *dev = parent->my_dev; + T(YAFFS_TRACE_OS, + (TSTR("FreeObject %p inode %p" TENDSTR), obj, obj->my_inode)); - /* Check if the entry exists. If it does then fail the call since we don't want a dup. */ - if (yaffs_find_by_name(parent, name)) - return NULL; + if (!obj) + YBUG(); + if (obj->parent) + YBUG(); + if (!list_empty(&obj->siblings)) + YBUG(); - if (type == YAFFS_OBJECT_TYPE_SYMLINK) { - str = yaffs_clone_str(alias_str); - if (!str) - return NULL; + if (obj->my_inode) { + /* We're still hooked up to a cached inode. + * Don't delete now, but mark for later deletion + */ + obj->defered_free = 1; + return; } - in = yaffs_new_obj(dev, -1, type); + yaffs_unhash_obj(obj); - if (!in) { - if (str) - YFREE(str); - return NULL; - } + yaffs_free_raw_obj(dev, obj); + dev->n_obj--; + dev->checkpoint_blocks_required = 0; /* force recalculation */ +} - if (in) { - in->hdr_chunk = 0; - in->valid = 1; - in->variant_type = type; +void yaffs_handle_defered_free(struct yaffs_obj *obj) +{ + if (obj->defered_free) + yaffs_free_obj(obj); +} - in->yst_mode = mode; +static int yaffs_generic_obj_del(struct yaffs_obj *in) +{ - yaffs_attribs_init(in, gid, uid, rdev); + /* First off, invalidate the file's data in the cache, without flushing. */ + yaffs_invalidate_whole_cache(in); - in->n_data_chunks = 0; + if (in->my_dev->param.is_yaffs2 && (in->parent != in->my_dev->del_dir)) { + /* Move to the unlinked directory so we have a record that it was deleted. */ + yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0, + 0); - yaffs_set_obj_name(in, name); - in->dirty = 1; + } - yaffs_add_obj_to_dir(parent, in); + yaffs_remove_obj_from_dir(in); + yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__); + in->hdr_chunk = 0; - in->my_dev = parent->my_dev; + yaffs_free_obj(in); + return YAFFS_OK; - switch (type) { - case YAFFS_OBJECT_TYPE_SYMLINK: - in->variant.symlink_variant.alias = str; - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - in->variant.hardlink_variant.equiv_obj = equiv_obj; - in->variant.hardlink_variant.equiv_id = - equiv_obj->obj_id; - list_add(&in->hard_links, &equiv_obj->hard_links); - break; - case YAFFS_OBJECT_TYPE_FILE: - case YAFFS_OBJECT_TYPE_DIRECTORY: - case YAFFS_OBJECT_TYPE_SPECIAL: - case YAFFS_OBJECT_TYPE_UNKNOWN: - /* do nothing */ - break; - } +} - if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) { - /* Could not create the object header, fail the creation */ - yaffs_del_obj(in); - in = NULL; +static void yaffs_soft_del_file(struct yaffs_obj *obj) +{ + if (obj->deleted && + obj->variant_type == YAFFS_OBJECT_TYPE_FILE && !obj->soft_del) { + if (obj->n_data_chunks <= 0) { + /* Empty file with no duplicate object headers, just delete it immediately */ + yaffs_free_tnode(obj->my_dev, + obj->variant.file_variant.top); + obj->variant.file_variant.top = NULL; + T(YAFFS_TRACE_TRACING, + (TSTR("yaffs: Deleting empty file %d" TENDSTR), + obj->obj_id)); + yaffs_generic_obj_del(obj); + } else { + yaffs_soft_del_worker(obj, + obj->variant.file_variant.top, + obj->variant. + file_variant.top_level, 0); + obj->soft_del = 1; } - - yaffs_update_parent(parent); } - - return in; } -struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent, - const YCHAR * name, u32 mode, u32 uid, - u32 gid) -{ - return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode, - uid, gid, NULL, NULL, 0); -} +/* Pruning removes any part of the file structure tree that is beyond the + * bounds of the file (ie that does not point to chunks). + * + * A file should only get pruned when its size is reduced. + * + * Before pruning, the chunks must be pulled from the tree and the + * level 0 tnode entries must be zeroed out. + * Could also use this for file deletion, but that's probably better handled + * by a special case. + * + * This function is recursive. For levels > 0 the function is called again on + * any sub-tree. For level == 0 we just check if the sub-tree has data. + * If there is no data in a subtree then it is pruned. + */ -struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR * name, - u32 mode, u32 uid, u32 gid) +static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev, + struct yaffs_tnode *tn, u32 level, + int del0) { - return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name, - mode, uid, gid, NULL, NULL, 0); -} + int i; + int has_data; -struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent, - const YCHAR * name, u32 mode, u32 uid, - u32 gid, u32 rdev) -{ - return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode, - uid, gid, NULL, NULL, rdev); -} + if (tn) { + has_data = 0; -struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent, - const YCHAR * name, u32 mode, u32 uid, - u32 gid, const YCHAR * alias) -{ - return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode, - uid, gid, NULL, alias, 0); -} - -/* yaffs_link_obj returns the object id of the equivalent object.*/ -struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name, - struct yaffs_obj *equiv_obj) -{ - /* Get the real object in case we were fed a hard link as an equivalent object */ - equiv_obj = yaffs_get_equivalent_obj(equiv_obj); - - if (yaffs_create_obj - (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0, - equiv_obj, NULL, 0)) { - return equiv_obj; - } else { - return NULL; - } + if (level > 0) { + for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) { + if (tn->internal[i]) { + tn->internal[i] = + yaffs_prune_worker(dev, + tn->internal[i], + level - 1, + (i == + 0) ? del0 : 1); + } -} + if (tn->internal[i]) + has_data++; + } + } else { + int tnode_size_u32 = dev->tnode_size / sizeof(u32); + u32 *map = (u32 *) tn; -static int yaffs_change_obj_name(struct yaffs_obj *obj, - struct yaffs_obj *new_dir, - const YCHAR * new_name, int force, int shadows) -{ - int unlink_op; - int del_op; + for (i = 0; !has_data && i < tnode_size_u32; i++) { + if (map[i]) + has_data++; + } + } - struct yaffs_obj *existing_target; + if (has_data == 0 && del0) { + /* Free and return NULL */ - if (new_dir == NULL) - new_dir = obj->parent; /* use the old directory */ + yaffs_free_tnode(dev, tn); + tn = NULL; + } - if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { - T(YAFFS_TRACE_ALWAYS, - (TSTR - ("tragedy: yaffs_change_obj_name: new_dir is not a directory" - TENDSTR))); - YBUG(); } - /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */ - if (obj->my_dev->param.is_yaffs2) - unlink_op = (new_dir == obj->my_dev->unlinked_dir); - else - unlink_op = (new_dir == obj->my_dev->unlinked_dir - && obj->variant_type == YAFFS_OBJECT_TYPE_FILE); + return tn; - del_op = (new_dir == obj->my_dev->del_dir); +} - existing_target = yaffs_find_by_name(new_dir, new_name); +static int yaffs_prune_tree(struct yaffs_dev *dev, + struct yaffs_file_var *file_struct) +{ + int i; + int has_data; + int done = 0; + struct yaffs_tnode *tn; - /* If the object is a file going into the unlinked directory, - * then it is OK to just stuff it in since duplicate names are allowed. - * else only proceed if the new name does not exist and if we're putting - * it into a directory. - */ - if ((unlink_op || - del_op || - force || - (shadows > 0) || - !existing_target) && - new_dir->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) { - yaffs_set_obj_name(obj, new_name); - obj->dirty = 1; + if (file_struct->top_level > 0) { + file_struct->top = + yaffs_prune_worker(dev, file_struct->top, + file_struct->top_level, 0); - yaffs_add_obj_to_dir(new_dir, obj); + /* Now we have a tree with all the non-zero branches NULL but the height + * is the same as it was. + * Let's see if we can trim internal tnodes to shorten the tree. + * We can do this if only the 0th element in the tnode is in use + * (ie all the non-zero are NULL) + */ - if (unlink_op) - obj->unlinked = 1; + while (file_struct->top_level && !done) { + tn = file_struct->top; - /* If it is a deletion then we mark it as a shrink for gc purposes. */ - if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= - 0) - return YAFFS_OK; + has_data = 0; + for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) { + if (tn->internal[i]) + has_data++; + } + + if (!has_data) { + file_struct->top = tn->internal[0]; + file_struct->top_level--; + yaffs_free_tnode(dev, tn); + } else { + done = 1; + } + } } - return YAFFS_FAIL; + return YAFFS_OK; } +/*-------------------- End of File Structure functions.-------------------*/ -/* Note: - * If old_name is NULL then we take old_dir as the object to be renamed. - */ -int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name, - struct yaffs_obj *new_dir, const YCHAR * new_name) +/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */ +static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev) { - struct yaffs_obj *obj = NULL; - struct yaffs_obj *existing_target = NULL; - int force = 0; - int result; - struct yaffs_dev *dev; + struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev); - if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) - YBUG(); - if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) - YBUG(); + if (obj) { + dev->n_obj++; - dev = old_dir->my_dev; + /* Now sweeten it up... */ -#ifdef CONFIG_YAFFS_CASE_INSENSITIVE - /* Special case for case insemsitive systems. - * While look-up is case insensitive, the name isn't. - * Therefore we might want to change x.txt to X.txt - */ - if (old_dir == new_dir && - old_name && new_name && - yaffs_strcmp(old_name, new_name) == 0) - force = 1; -#endif + memset(obj, 0, sizeof(struct yaffs_obj)); + obj->being_created = 1; - if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) > - YAFFS_MAX_NAME_LENGTH) - /* ENAMETOOLONG */ - return YAFFS_FAIL; + obj->my_dev = dev; + obj->hdr_chunk = 0; + obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN; + INIT_LIST_HEAD(&(obj->hard_links)); + INIT_LIST_HEAD(&(obj->hash_link)); + INIT_LIST_HEAD(&obj->siblings); - if(old_name) - obj = yaffs_find_by_name(old_dir, old_name); - else{ - obj = old_dir; - old_dir = obj->parent; - } + /* Now make the directory sane */ + if (dev->root_dir) { + obj->parent = dev->root_dir; + list_add(&(obj->siblings), + &dev->root_dir->variant.dir_variant.children); + } + /* Add it to the lost and found directory. + * NB Can't put root or lost-n-found in lost-n-found so + * check if lost-n-found exists first + */ + if (dev->lost_n_found) + yaffs_add_obj_to_dir(dev->lost_n_found, obj); - if (obj && obj->rename_allowed) { + obj->being_created = 0; + } - /* Now do the handling for an existing target, if there is one */ + dev->checkpoint_blocks_required = 0; /* force recalculation */ - existing_target = yaffs_find_by_name(new_dir, new_name); - if (yaffs_is_non_empty_dir(existing_target)){ - return YAFFS_FAIL; /* ENOTEMPTY */ - } else if (existing_target && existing_target != obj) { - /* Nuke the target first, using shadowing, - * but only if it isn't the same object. - * - * Note we must disable gc otherwise it can mess up the shadowing. - * - */ - dev->gc_disable = 1; - yaffs_change_obj_name(obj, new_dir, new_name, force, - existing_target->obj_id); - existing_target->is_shadowed = 1; - yaffs_unlink_obj(existing_target); - dev->gc_disable = 0; - } + return obj; +} - result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0); +static int yaffs_find_nice_bucket(struct yaffs_dev *dev) +{ + int i; + int l = 999; + int lowest = 999999; - yaffs_update_parent(old_dir); - if (new_dir != old_dir) - yaffs_update_parent(new_dir); + /* Search for the shortest list or one that + * isn't too long. + */ + + for (i = 0; i < 10 && lowest > 4; i++) { + dev->bucket_finder++; + dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS; + if (dev->obj_bucket[dev->bucket_finder].count < lowest) { + lowest = dev->obj_bucket[dev->bucket_finder].count; + l = dev->bucket_finder; + } - return result; } - return YAFFS_FAIL; -} -/*------------------------- Block Management and Page Allocation ----------------*/ + return l; +} -static int yaffs_init_blocks(struct yaffs_dev *dev) +static int yaffs_new_obj_id(struct yaffs_dev *dev) { - int n_blocks = dev->internal_end_block - dev->internal_start_block + 1; + int bucket = yaffs_find_nice_bucket(dev); - dev->block_info = NULL; - dev->chunk_bits = NULL; + /* Now find an object value that has not already been taken + * by scanning the list. + */ - dev->alloc_block = -1; /* force it to get a new one */ + int found = 0; + struct list_head *i; - /* If the first allocation strategy fails, thry the alternate one */ - dev->block_info = YMALLOC(n_blocks * sizeof(struct yaffs_block_info)); - if (!dev->block_info) { - dev->block_info = - YMALLOC_ALT(n_blocks * sizeof(struct yaffs_block_info)); - dev->block_info_alt = 1; - } else { - dev->block_info_alt = 0; - } + u32 n = (u32) bucket; - if (dev->block_info) { - /* Set up dynamic blockinfo stuff. */ - dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8; /* round up bytes */ - dev->chunk_bits = YMALLOC(dev->chunk_bit_stride * n_blocks); - if (!dev->chunk_bits) { - dev->chunk_bits = - YMALLOC_ALT(dev->chunk_bit_stride * n_blocks); - dev->chunk_bits_alt = 1; - } else { - dev->chunk_bits_alt = 0; - } - } + /* yaffs_check_obj_hash_sane(); */ - if (dev->block_info && dev->chunk_bits) { - memset(dev->block_info, 0, - n_blocks * sizeof(struct yaffs_block_info)); - memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks); - return YAFFS_OK; + while (!found) { + found = 1; + n += YAFFS_NOBJECT_BUCKETS; + if (1 || dev->obj_bucket[bucket].count > 0) { + list_for_each(i, &dev->obj_bucket[bucket].list) { + /* If there is already one in the list */ + if (i && list_entry(i, struct yaffs_obj, + hash_link)->obj_id == n) { + found = 0; + } + } + } } - return YAFFS_FAIL; + return n; } -static void yaffs_deinit_blocks(struct yaffs_dev *dev) +static void yaffs_hash_obj(struct yaffs_obj *in) { - if (dev->block_info_alt && dev->block_info) - YFREE_ALT(dev->block_info); - else if (dev->block_info) - YFREE(dev->block_info); - - dev->block_info_alt = 0; - - dev->block_info = NULL; + int bucket = yaffs_hash_fn(in->obj_id); + struct yaffs_dev *dev = in->my_dev; - if (dev->chunk_bits_alt && dev->chunk_bits) - YFREE_ALT(dev->chunk_bits); - else if (dev->chunk_bits) - YFREE(dev->chunk_bits); - dev->chunk_bits_alt = 0; - dev->chunk_bits = NULL; + list_add(&in->hash_link, &dev->obj_bucket[bucket].list); + dev->obj_bucket[bucket].count++; } -void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no) +struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number) { - struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no); + int bucket = yaffs_hash_fn(number); + struct list_head *i; + struct yaffs_obj *in; - int erased_ok = 0; + list_for_each(i, &dev->obj_bucket[bucket].list) { + /* Look if it is in the list */ + if (i) { + in = list_entry(i, struct yaffs_obj, hash_link); + if (in->obj_id == number) { - /* If the block is still healthy erase it and mark as clean. - * If the block has had a data failure, then retire it. - */ + /* Don't tell the VFS about this one if it is defered free */ + if (in->defered_free) + return NULL; - T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE, - (TSTR("yaffs_block_became_dirty block %d state %d %s" TENDSTR), - block_no, bi->block_state, - (bi->needs_retiring) ? "needs retiring" : "")); + return in; + } + } + } - yaffs2_clear_oldest_dirty_seq(dev, bi); + return NULL; +} - bi->block_state = YAFFS_BLOCK_STATE_DIRTY; +struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number, + enum yaffs_obj_type type) +{ + struct yaffs_obj *the_obj = NULL; + struct yaffs_tnode *tn = NULL; - /* If this is the block being garbage collected then stop gc'ing this block */ - if (block_no == dev->gc_block) - dev->gc_block = 0; + if (number < 0) + number = yaffs_new_obj_id(dev); - /* If this block is currently the best candidate for gc then drop as a candidate */ - if (block_no == dev->gc_dirtiest) { - dev->gc_dirtiest = 0; - dev->gc_pages_in_use = 0; + if (type == YAFFS_OBJECT_TYPE_FILE) { + tn = yaffs_get_tnode(dev); + if (!tn) + return NULL; } - if (!bi->needs_retiring) { - yaffs2_checkpt_invalidate(dev); - erased_ok = yaffs_erase_block(dev, block_no); - if (!erased_ok) { - dev->n_erase_failures++; - T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, - (TSTR("**>> Erasure failed %d" TENDSTR), block_no)); - } + the_obj = yaffs_alloc_empty_obj(dev); + if (!the_obj) { + if (tn) + yaffs_free_tnode(dev, tn); + return NULL; } - if (erased_ok && - ((yaffs_trace_mask & YAFFS_TRACE_ERASE) - || !yaffs_skip_verification(dev))) { - int i; - for (i = 0; i < dev->param.chunks_per_block; i++) { - if (!yaffs_check_chunk_erased - (dev, block_no * dev->param.chunks_per_block + i)) { - T(YAFFS_TRACE_ERROR, - (TSTR - (">>Block %d erasure supposedly OK, but chunk %d not erased" - TENDSTR), block_no, i)); - } + if (the_obj) { + the_obj->fake = 0; + the_obj->rename_allowed = 1; + the_obj->unlink_allowed = 1; + the_obj->obj_id = number; + yaffs_hash_obj(the_obj); + the_obj->variant_type = type; + yaffs_load_current_time(the_obj, 1, 1); + + switch (type) { + case YAFFS_OBJECT_TYPE_FILE: + the_obj->variant.file_variant.file_size = 0; + the_obj->variant.file_variant.scanned_size = 0; + the_obj->variant.file_variant.shrink_size = ~0; /* max */ + the_obj->variant.file_variant.top_level = 0; + the_obj->variant.file_variant.top = tn; + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + INIT_LIST_HEAD(&the_obj->variant.dir_variant.children); + INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + case YAFFS_OBJECT_TYPE_HARDLINK: + case YAFFS_OBJECT_TYPE_SPECIAL: + /* No action required */ + break; + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* todo this should not happen */ + break; } } - if (erased_ok) { - /* Clean it up... */ - bi->block_state = YAFFS_BLOCK_STATE_EMPTY; - bi->seq_number = 0; - dev->n_erased_blocks++; - bi->pages_in_use = 0; - bi->soft_del_pages = 0; - bi->has_shrink_hdr = 0; - bi->skip_erased_check = 1; /* This is clean, so no need to check */ - bi->gc_prioritise = 0; - yaffs_clear_chunk_bits(dev, block_no); + return the_obj; +} - T(YAFFS_TRACE_ERASE, - (TSTR("Erased block %d" TENDSTR), block_no)); - } else { - dev->n_free_chunks -= dev->param.chunks_per_block; /* We lost a block of free space */ +static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev, + int number, u32 mode) +{ - yaffs_retire_block(dev, block_no); - T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, - (TSTR("**>> Block %d retired" TENDSTR), block_no)); + struct yaffs_obj *obj = + yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY); + if (obj) { + obj->fake = 1; /* it is fake so it might have no NAND presence... */ + obj->rename_allowed = 0; /* ... and we're not allowed to rename it... */ + obj->unlink_allowed = 0; /* ... or unlink it */ + obj->deleted = 0; + obj->unlinked = 0; + obj->yst_mode = mode; + obj->my_dev = dev; + obj->hdr_chunk = 0; /* Not a valid chunk. */ } + + return obj; + } -static int yaffs_find_alloc_block(struct yaffs_dev *dev) + +static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev) { int i; - struct yaffs_block_info *bi; + dev->n_obj = 0; + dev->n_tnodes = 0; - if (dev->n_erased_blocks < 1) { - /* Hoosterman we've got a problem. - * Can't get space to gc - */ - T(YAFFS_TRACE_ERROR, - (TSTR("yaffs tragedy: no more erased blocks" TENDSTR))); + yaffs_init_raw_tnodes_and_objs(dev); - return -1; + for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { + INIT_LIST_HEAD(&dev->obj_bucket[i].list); + dev->obj_bucket[i].count = 0; } +} - /* Find an empty block. */ - - for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { - dev->alloc_block_finder++; - if (dev->alloc_block_finder < dev->internal_start_block - || dev->alloc_block_finder > dev->internal_end_block) { - dev->alloc_block_finder = dev->internal_start_block; - } +struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev, + int number, + enum yaffs_obj_type type) +{ + struct yaffs_obj *the_obj = NULL; - bi = yaffs_get_block_info(dev, dev->alloc_block_finder); + if (number > 0) + the_obj = yaffs_find_by_number(dev, number); - if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { - bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING; - dev->seq_number++; - bi->seq_number = dev->seq_number; - dev->n_erased_blocks--; - T(YAFFS_TRACE_ALLOCATE, - (TSTR("Allocated block %d, seq %d, %d left" TENDSTR), - dev->alloc_block_finder, dev->seq_number, - dev->n_erased_blocks)); - return dev->alloc_block_finder; - } - } + if (!the_obj) + the_obj = yaffs_new_obj(dev, number, type); - T(YAFFS_TRACE_ALWAYS, - (TSTR - ("yaffs tragedy: no more erased blocks, but there should have been %d" - TENDSTR), dev->n_erased_blocks)); + return the_obj; - return -1; } -/* - * Check if there's space to allocate... - * Thinks.... do we need top make this ths same as yaffs_get_free_chunks()? - */ -int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks) +YCHAR *yaffs_clone_str(const YCHAR * str) { - int reserved_chunks; - int reserved_blocks = dev->param.n_reserved_blocks; - int checkpt_blocks; + YCHAR *new_str = NULL; + int len; - checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev); + if (!str) + str = _Y(""); - reserved_chunks = - ((reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block); + len = strnlen(str, YAFFS_MAX_ALIAS_LENGTH); + new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS); + if (new_str) { + strncpy(new_str, str, len); + new_str[len] = 0; + } + return new_str; - return (dev->n_free_chunks > (reserved_chunks + n_chunks)); } +/* + *yaffs_update_parent() handles fixing a directories mtime and ctime when a new + * link (ie. name) is created or deleted in the directory. + * + * ie. + * create dir/a : update dir's mtime/ctime + * rm dir/a: update dir's mtime/ctime + * modify dir/a: don't update dir's mtimme/ctime + * + * This can be handled immediately or defered. Defering helps reduce the number + * of updates when many files in a directory are changed within a brief period. + * + * If the directory updating is defered then yaffs_update_dirty_dirs must be + * called periodically. + */ -static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver, - struct yaffs_block_info **block_ptr) +static void yaffs_update_parent(struct yaffs_obj *obj) { - int ret_val; - struct yaffs_block_info *bi; - - if (dev->alloc_block < 0) { - /* Get next block to allocate off */ - dev->alloc_block = yaffs_find_alloc_block(dev); - dev->alloc_page = 0; - } - - if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) { - /* Not enough space to allocate unless we're allowed to use the reserve. */ - return -1; - } - - if (dev->n_erased_blocks < dev->param.n_reserved_blocks - && dev->alloc_page == 0) { - T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR))); - } - - /* Next page please.... */ - if (dev->alloc_block >= 0) { - bi = yaffs_get_block_info(dev, dev->alloc_block); - - ret_val = (dev->alloc_block * dev->param.chunks_per_block) + - dev->alloc_page; - bi->pages_in_use++; - yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page); - - dev->alloc_page++; - - dev->n_free_chunks--; + struct yaffs_dev *dev; + if (!obj) + return; + dev = obj->my_dev; + obj->dirty = 1; + yaffs_load_current_time(obj, 0, 1); + if (dev->param.defered_dir_update) { + struct list_head *link = &obj->variant.dir_variant.dirty; - /* If the block is full set the state to full */ - if (dev->alloc_page >= dev->param.chunks_per_block) { - bi->block_state = YAFFS_BLOCK_STATE_FULL; - dev->alloc_block = -1; + if (list_empty(link)) { + list_add(link, &dev->dirty_dirs); + T(YAFFS_TRACE_BACKGROUND, + (TSTR("Added object %d to dirty directories" TENDSTR), + obj->obj_id)); } - if (block_ptr) - *block_ptr = bi; - - return ret_val; - } - - T(YAFFS_TRACE_ERROR, - (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR))); - - return -1; + } else { + yaffs_update_oh(obj, NULL, 0, 0, 0, NULL); + } } -static int yaffs_get_erased_chunks(struct yaffs_dev *dev) +void yaffs_update_dirty_dirs(struct yaffs_dev *dev) { - int n; + struct list_head *link; + struct yaffs_obj *obj; + struct yaffs_dir_var *d_s; + union yaffs_obj_var *o_v; - n = dev->n_erased_blocks * dev->param.chunks_per_block; + T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR))); - if (dev->alloc_block > 0) - n += (dev->param.chunks_per_block - dev->alloc_page); + while (!list_empty(&dev->dirty_dirs)) { + link = dev->dirty_dirs.next; + list_del_init(link); - return n; + d_s = list_entry(link, struct yaffs_dir_var, dirty); + o_v = list_entry(d_s, union yaffs_obj_var, dir_variant); + obj = list_entry(o_v, struct yaffs_obj, variant); + + T(YAFFS_TRACE_BACKGROUND, + (TSTR("Update directory %d" TENDSTR), obj->obj_id)); + if (obj->dirty) + yaffs_update_oh(obj, NULL, 0, 0, 0, NULL); + } } /* - * yaffs_skip_rest_of_block() skips over the rest of the allocation block - * if we don't want to write to it. + * Mknod (create) a new object. + * equiv_obj only has meaning for a hard link; + * alias_str only has meaning for a symlink. + * rdev only has meaning for devices (a subset of special objects) */ -void yaffs_skip_rest_of_block(struct yaffs_dev *dev) -{ - if (dev->alloc_block > 0) { - struct yaffs_block_info *bi = - yaffs_get_block_info(dev, dev->alloc_block); - if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) { - bi->block_state = YAFFS_BLOCK_STATE_FULL; - dev->alloc_block = -1; - } - } -} -static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block) +static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type, + struct yaffs_obj *parent, + const YCHAR * name, + u32 mode, + u32 uid, + u32 gid, + struct yaffs_obj *equiv_obj, + const YCHAR * alias_str, u32 rdev) { - int old_chunk; - int new_chunk; - int mark_flash; - int ret_val = YAFFS_OK; - int i; - int is_checkpt_block; - int matching_chunk; - int max_copies; - - int chunks_before = yaffs_get_erased_chunks(dev); - int chunks_after; - - struct yaffs_ext_tags tags; + struct yaffs_obj *in; + YCHAR *str = NULL; - struct yaffs_block_info *bi = yaffs_get_block_info(dev, block); + struct yaffs_dev *dev = parent->my_dev; - struct yaffs_obj *object; + /* Check if the entry exists. If it does then fail the call since we don't want a dup. */ + if (yaffs_find_by_name(parent, name)) + return NULL; - is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT); + if (type == YAFFS_OBJECT_TYPE_SYMLINK) { + str = yaffs_clone_str(alias_str); + if (!str) + return NULL; + } - T(YAFFS_TRACE_TRACING, - (TSTR - ("Collecting block %d, in use %d, shrink %d, whole_block %d" - TENDSTR), block, bi->pages_in_use, bi->has_shrink_hdr, - whole_block)); + in = yaffs_new_obj(dev, -1, type); - /*yaffs_verify_free_chunks(dev); */ + if (!in) { + if (str) + kfree(str); + return NULL; + } - if (bi->block_state == YAFFS_BLOCK_STATE_FULL) - bi->block_state = YAFFS_BLOCK_STATE_COLLECTING; + if (in) { + in->hdr_chunk = 0; + in->valid = 1; + in->variant_type = type; - bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */ + in->yst_mode = mode; - dev->gc_disable = 1; + yaffs_attribs_init(in, gid, uid, rdev); - if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) { - T(YAFFS_TRACE_TRACING, - (TSTR - ("Collecting block %d that has no chunks in use" TENDSTR), - block)); - yaffs_block_became_dirty(dev, block); - } else { + in->n_data_chunks = 0; - u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__); + yaffs_set_obj_name(in, name); + in->dirty = 1; - yaffs_verify_blk(dev, bi, block); + yaffs_add_obj_to_dir(parent, in); - max_copies = (whole_block) ? dev->param.chunks_per_block : 5; - old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk; + in->my_dev = parent->my_dev; - for ( /* init already done */ ; - ret_val == YAFFS_OK && - dev->gc_chunk < dev->param.chunks_per_block && - (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) && - max_copies > 0; dev->gc_chunk++, old_chunk++) { - if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) { + switch (type) { + case YAFFS_OBJECT_TYPE_SYMLINK: + in->variant.symlink_variant.alias = str; + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + in->variant.hardlink_variant.equiv_obj = equiv_obj; + in->variant.hardlink_variant.equiv_id = + equiv_obj->obj_id; + list_add(&in->hard_links, &equiv_obj->hard_links); + break; + case YAFFS_OBJECT_TYPE_FILE: + case YAFFS_OBJECT_TYPE_DIRECTORY: + case YAFFS_OBJECT_TYPE_SPECIAL: + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* do nothing */ + break; + } - /* This page is in use and might need to be copied off */ + if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) { + /* Could not create the object header, fail the creation */ + yaffs_del_obj(in); + in = NULL; + } - max_copies--; + yaffs_update_parent(parent); + } - mark_flash = 1; + return in; +} - yaffs_init_tags(&tags); +struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent, + const YCHAR * name, u32 mode, u32 uid, + u32 gid) +{ + return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode, + uid, gid, NULL, NULL, 0); +} - yaffs_rd_chunk_tags_nand(dev, old_chunk, - buffer, &tags); +struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR * name, + u32 mode, u32 uid, u32 gid) +{ + return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name, + mode, uid, gid, NULL, NULL, 0); +} - object = yaffs_find_by_number(dev, tags.obj_id); +struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent, + const YCHAR * name, u32 mode, u32 uid, + u32 gid, u32 rdev) +{ + return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode, + uid, gid, NULL, NULL, rdev); +} - T(YAFFS_TRACE_GC_DETAIL, - (TSTR - ("Collecting chunk in block %d, %d %d %d " +struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent, + const YCHAR * name, u32 mode, u32 uid, + u32 gid, const YCHAR * alias) +{ + return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode, + uid, gid, NULL, alias, 0); +} + +/* yaffs_link_obj returns the object id of the equivalent object.*/ +struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name, + struct yaffs_obj *equiv_obj) +{ + /* Get the real object in case we were fed a hard link as an equivalent object */ + equiv_obj = yaffs_get_equivalent_obj(equiv_obj); + + if (yaffs_create_obj + (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0, + equiv_obj, NULL, 0)) { + return equiv_obj; + } else { + return NULL; + } + +} + + + +/*------------------------- Block Management and Page Allocation ----------------*/ + +static int yaffs_init_blocks(struct yaffs_dev *dev) +{ + int n_blocks = dev->internal_end_block - dev->internal_start_block + 1; + + dev->block_info = NULL; + dev->chunk_bits = NULL; + + dev->alloc_block = -1; /* force it to get a new one */ + + /* If the first allocation strategy fails, thry the alternate one */ + dev->block_info = + kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS); + if (!dev->block_info) { + dev->block_info = + vmalloc(n_blocks * sizeof(struct yaffs_block_info)); + dev->block_info_alt = 1; + } else { + dev->block_info_alt = 0; + } + + if (dev->block_info) { + /* Set up dynamic blockinfo stuff. Round up bytes. */ + dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8; + dev->chunk_bits = + kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS); + if (!dev->chunk_bits) { + dev->chunk_bits = + vmalloc(dev->chunk_bit_stride * n_blocks); + dev->chunk_bits_alt = 1; + } else { + dev->chunk_bits_alt = 0; + } + } + + if (dev->block_info && dev->chunk_bits) { + memset(dev->block_info, 0, + n_blocks * sizeof(struct yaffs_block_info)); + memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks); + return YAFFS_OK; + } + + return YAFFS_FAIL; +} + +static void yaffs_deinit_blocks(struct yaffs_dev *dev) +{ + if (dev->block_info_alt && dev->block_info) + vfree(dev->block_info); + else if (dev->block_info) + kfree(dev->block_info); + + dev->block_info_alt = 0; + + dev->block_info = NULL; + + if (dev->chunk_bits_alt && dev->chunk_bits) + vfree(dev->chunk_bits); + else if (dev->chunk_bits) + kfree(dev->chunk_bits); + dev->chunk_bits_alt = 0; + dev->chunk_bits = NULL; +} + +void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no) +{ + struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no); + + int erased_ok = 0; + + /* If the block is still healthy erase it and mark as clean. + * If the block has had a data failure, then retire it. + */ + + T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE, + (TSTR("yaffs_block_became_dirty block %d state %d %s" TENDSTR), + block_no, bi->block_state, + (bi->needs_retiring) ? "needs retiring" : "")); + + yaffs2_clear_oldest_dirty_seq(dev, bi); + + bi->block_state = YAFFS_BLOCK_STATE_DIRTY; + + /* If this is the block being garbage collected then stop gc'ing this block */ + if (block_no == dev->gc_block) + dev->gc_block = 0; + + /* If this block is currently the best candidate for gc then drop as a candidate */ + if (block_no == dev->gc_dirtiest) { + dev->gc_dirtiest = 0; + dev->gc_pages_in_use = 0; + } + + if (!bi->needs_retiring) { + yaffs2_checkpt_invalidate(dev); + erased_ok = yaffs_erase_block(dev, block_no); + if (!erased_ok) { + dev->n_erase_failures++; + T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + (TSTR("**>> Erasure failed %d" TENDSTR), block_no)); + } + } + + if (erased_ok && + ((yaffs_trace_mask & YAFFS_TRACE_ERASE) + || !yaffs_skip_verification(dev))) { + int i; + for (i = 0; i < dev->param.chunks_per_block; i++) { + if (!yaffs_check_chunk_erased + (dev, block_no * dev->param.chunks_per_block + i)) { + T(YAFFS_TRACE_ERROR, + (TSTR + (">>Block %d erasure supposedly OK, but chunk %d not erased" + TENDSTR), block_no, i)); + } + } + } + + if (erased_ok) { + /* Clean it up... */ + bi->block_state = YAFFS_BLOCK_STATE_EMPTY; + bi->seq_number = 0; + dev->n_erased_blocks++; + bi->pages_in_use = 0; + bi->soft_del_pages = 0; + bi->has_shrink_hdr = 0; + bi->skip_erased_check = 1; /* This is clean, so no need to check */ + bi->gc_prioritise = 0; + yaffs_clear_chunk_bits(dev, block_no); + + T(YAFFS_TRACE_ERASE, + (TSTR("Erased block %d" TENDSTR), block_no)); + } else { + dev->n_free_chunks -= dev->param.chunks_per_block; /* We lost a block of free space */ + + yaffs_retire_block(dev, block_no); + T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, + (TSTR("**>> Block %d retired" TENDSTR), block_no)); + } +} + + + +static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block) +{ + int old_chunk; + int new_chunk; + int mark_flash; + int ret_val = YAFFS_OK; + int i; + int is_checkpt_block; + int matching_chunk; + int max_copies; + + int chunks_before = yaffs_get_erased_chunks(dev); + int chunks_after; + + struct yaffs_ext_tags tags; + + struct yaffs_block_info *bi = yaffs_get_block_info(dev, block); + + struct yaffs_obj *object; + + is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT); + + T(YAFFS_TRACE_TRACING, + (TSTR + ("Collecting block %d, in use %d, shrink %d, whole_block %d" + TENDSTR), block, bi->pages_in_use, bi->has_shrink_hdr, + whole_block)); + + /*yaffs_verify_free_chunks(dev); */ + + if (bi->block_state == YAFFS_BLOCK_STATE_FULL) + bi->block_state = YAFFS_BLOCK_STATE_COLLECTING; + + bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */ + + dev->gc_disable = 1; + + if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) { + T(YAFFS_TRACE_TRACING, + (TSTR + ("Collecting block %d that has no chunks in use" TENDSTR), + block)); + yaffs_block_became_dirty(dev, block); + } else { + + u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__); + + yaffs_verify_blk(dev, bi, block); + + max_copies = (whole_block) ? dev->param.chunks_per_block : 5; + old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk; + + for ( /* init already done */ ; + ret_val == YAFFS_OK && + dev->gc_chunk < dev->param.chunks_per_block && + (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) && + max_copies > 0; dev->gc_chunk++, old_chunk++) { + if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) { + + /* This page is in use and might need to be copied off */ + + max_copies--; + + mark_flash = 1; + + yaffs_init_tags(&tags); + + yaffs_rd_chunk_tags_nand(dev, old_chunk, + buffer, &tags); + + object = yaffs_find_by_number(dev, tags.obj_id); + + T(YAFFS_TRACE_GC_DETAIL, + (TSTR + ("Collecting chunk in block %d, %d %d %d " TENDSTR), dev->gc_chunk, tags.obj_id, tags.chunk_id, tags.n_bytes)); @@ -2546,223 +3020,25 @@ int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency) return erased_chunks > dev->n_free_chunks / 2; } -/*------------------------- TAGS --------------------------------*/ +/*-------------------- Data file manipulation -----------------*/ -static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id, - int chunk_obj) +static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer) { - return (tags->chunk_id == chunk_obj && - tags->obj_id == obj_id && !tags->is_deleted) ? 1 : 0; + int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL); -} + if (nand_chunk >= 0) + return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk, + buffer, NULL); + else { + T(YAFFS_TRACE_NANDACCESS, + (TSTR("Chunk %d not found zero instead" TENDSTR), + nand_chunk)); + /* get sane (zero) data if you read a hole */ + memset(buffer, 0, in->my_dev->data_bytes_per_chunk); + return 0; + } -/*-------------------- Data file manipulation -----------------*/ - -static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk, - struct yaffs_ext_tags *tags) -{ - /*Get the Tnode, then get the level 0 offset chunk offset */ - struct yaffs_tnode *tn; - int the_chunk = -1; - struct yaffs_ext_tags local_tags; - int ret_val = -1; - - struct yaffs_dev *dev = in->my_dev; - - if (!tags) { - /* Passed a NULL, so use our own tags space */ - tags = &local_tags; - } - - tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk); - - if (tn) { - the_chunk = yaffs_get_group_base(dev, tn, inode_chunk); - - ret_val = - yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id, - inode_chunk); - } - return ret_val; -} - -static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk, - struct yaffs_ext_tags *tags) -{ - /* Get the Tnode, then get the level 0 offset chunk offset */ - struct yaffs_tnode *tn; - int the_chunk = -1; - struct yaffs_ext_tags local_tags; - - struct yaffs_dev *dev = in->my_dev; - int ret_val = -1; - - if (!tags) { - /* Passed a NULL, so use our own tags space */ - tags = &local_tags; - } - - tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk); - - if (tn) { - - the_chunk = yaffs_get_group_base(dev, tn, inode_chunk); - - ret_val = - yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id, - inode_chunk); - - /* Delete the entry in the filestructure (if found) */ - if (ret_val != -1) - yaffs_load_tnode_0(dev, tn, inode_chunk, 0); - } - - return ret_val; -} - -int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk, - int nand_chunk, int in_scan) -{ - /* NB in_scan is zero unless scanning. - * For forward scanning, in_scan is > 0; - * for backward scanning in_scan is < 0 - * - * nand_chunk = 0 is a dummy insert to make sure the tnodes are there. - */ - - struct yaffs_tnode *tn; - struct yaffs_dev *dev = in->my_dev; - int existing_cunk; - struct yaffs_ext_tags existing_tags; - struct yaffs_ext_tags new_tags; - unsigned existing_serial, new_serial; - - if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) { - /* Just ignore an attempt at putting a chunk into a non-file during scanning - * If it is not during Scanning then something went wrong! - */ - if (!in_scan) { - T(YAFFS_TRACE_ERROR, - (TSTR - ("yaffs tragedy:attempt to put data chunk into a non-file" - TENDSTR))); - YBUG(); - } - - yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); - return YAFFS_OK; - } - - tn = yaffs_add_find_tnode_0(dev, - &in->variant.file_variant, - inode_chunk, NULL); - if (!tn) - return YAFFS_FAIL; - - if (!nand_chunk) - /* Dummy insert, bail now */ - return YAFFS_OK; - - existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk); - - if (in_scan != 0) { - /* If we're scanning then we need to test for duplicates - * NB This does not need to be efficient since it should only ever - * happen when the power fails during a write, then only one - * chunk should ever be affected. - * - * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO - * Update: For backward scanning we don't need to re-read tags so this is quite cheap. - */ - - if (existing_cunk > 0) { - /* NB Right now existing chunk will not be real chunk_id if the chunk group size > 1 - * thus we have to do a FindChunkInFile to get the real chunk id. - * - * We have a duplicate now we need to decide which one to use: - * - * Backwards scanning YAFFS2: The old one is what we use, dump the new one. - * Forward scanning YAFFS2: The new one is what we use, dump the old one. - * YAFFS1: Get both sets of tags and compare serial numbers. - */ - - if (in_scan > 0) { - /* Only do this for forward scanning */ - yaffs_rd_chunk_tags_nand(dev, - nand_chunk, - NULL, &new_tags); - - /* Do a proper find */ - existing_cunk = - yaffs_find_chunk_in_file(in, inode_chunk, - &existing_tags); - } - - if (existing_cunk <= 0) { - /*Hoosterman - how did this happen? */ - - T(YAFFS_TRACE_ERROR, - (TSTR - ("yaffs tragedy: existing chunk < 0 in scan" - TENDSTR))); - - } - - /* NB The deleted flags should be false, otherwise the chunks will - * not be loaded during a scan - */ - - if (in_scan > 0) { - new_serial = new_tags.serial_number; - existing_serial = existing_tags.serial_number; - } - - if ((in_scan > 0) && - (existing_cunk <= 0 || - ((existing_serial + 1) & 3) == new_serial)) { - /* Forward scanning. - * Use new - * Delete the old one and drop through to update the tnode - */ - yaffs_chunk_del(dev, existing_cunk, 1, - __LINE__); - } else { - /* Backward scanning or we want to use the existing one - * Use existing. - * Delete the new one and return early so that the tnode isn't changed - */ - yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); - return YAFFS_OK; - } - } - - } - - if (existing_cunk == 0) - in->n_data_chunks++; - - yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk); - - return YAFFS_OK; -} - -static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer) -{ - int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL); - - if (nand_chunk >= 0) - return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk, - buffer, NULL); - else { - T(YAFFS_TRACE_NANDACCESS, - (TSTR("Chunk %d not found zero instead" TENDSTR), - nand_chunk)); - /* get sane (zero) data if you read a hole */ - memset(buffer, 0, in->my_dev->data_bytes_per_chunk); - return 0; - } - -} +} void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash, int lyn) @@ -2885,421 +3161,400 @@ static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk, } -/* UpdateObjectHeader updates the header on NAND for an object. - * If name is not NULL, then that new name is used. - */ -int yaffs_update_oh(struct yaffs_obj *in, const YCHAR * name, int force, - int is_shrink, int shadows, struct yaffs_xattr_mod *xmod) -{ - - struct yaffs_block_info *bi; - struct yaffs_dev *dev = in->my_dev; - int prev_chunk_id; - int ret_val = 0; - int result = 0; +static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set, + const YCHAR * name, const void *value, int size, + int flags) +{ + struct yaffs_xattr_mod xmod; - int new_chunk_id; - struct yaffs_ext_tags new_tags; - struct yaffs_ext_tags old_tags; - const YCHAR *alias = NULL; + int result; - u8 *buffer = NULL; - YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1]; + xmod.set = set; + xmod.name = name; + xmod.data = value; + xmod.size = size; + xmod.flags = flags; + xmod.result = -ENOSPC; - struct yaffs_obj_hdr *oh = NULL; + result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod); - yaffs_strcpy(old_name, _Y("silly old name")); + if (result > 0) + return xmod.result; + else + return -ENOSPC; +} - if (!in->fake || in == dev->root_dir || /* The root_dir should also be saved */ - force || xmod) { +static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer, + struct yaffs_xattr_mod *xmod) +{ + int retval = 0; + int x_offs = sizeof(struct yaffs_obj_hdr); + struct yaffs_dev *dev = obj->my_dev; + int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr); - yaffs_check_gc(dev, 0); - yaffs_check_obj_details_loaded(in); + char *x_buffer = buffer + x_offs; - buffer = yaffs_get_temp_buffer(in->my_dev, __LINE__); - oh = (struct yaffs_obj_hdr *)buffer; + if (xmod->set) + retval = + nval_set(x_buffer, x_size, xmod->name, xmod->data, + xmod->size, xmod->flags); + else + retval = nval_del(x_buffer, x_size, xmod->name); - prev_chunk_id = in->hdr_chunk; + obj->has_xattr = nval_hasvalues(x_buffer, x_size); + obj->xattr_known = 1; - if (prev_chunk_id > 0) { - result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id, - buffer, &old_tags); + xmod->result = retval; - yaffs_verify_oh(in, oh, &old_tags, 0); + return retval; +} - memcpy(old_name, oh->name, sizeof(oh->name)); - memset(buffer, 0xFF, sizeof(struct yaffs_obj_hdr)); - } else { - memset(buffer, 0xFF, dev->data_bytes_per_chunk); - } +static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR * name, + void *value, int size) +{ + char *buffer = NULL; + int result; + struct yaffs_ext_tags tags; + struct yaffs_dev *dev = obj->my_dev; + int x_offs = sizeof(struct yaffs_obj_hdr); + int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr); - oh->type = in->variant_type; - oh->yst_mode = in->yst_mode; - oh->shadows_obj = oh->inband_shadowed_obj_id = shadows; + char *x_buffer; - yaffs_load_attribs_oh(oh, in); + int retval = 0; - if (in->parent) - oh->parent_obj_id = in->parent->obj_id; + if (obj->hdr_chunk < 1) + return -ENODATA; + + /* If we know that the object has no xattribs then don't do all the + * reading and parsing. + */ + if (obj->xattr_known && !obj->has_xattr) { + if (name) + return -ENODATA; else - oh->parent_obj_id = 0; + return 0; + } - if (name && *name) { - memset(oh->name, 0, sizeof(oh->name)); - yaffs_load_oh_from_name(dev, oh->name, name); - } else if (prev_chunk_id > 0) { - memcpy(oh->name, old_name, sizeof(oh->name)); - } else { - memset(oh->name, 0, sizeof(oh->name)); - } + buffer = (char *)yaffs_get_temp_buffer(dev, __LINE__); + if (!buffer) + return -ENOMEM; - oh->is_shrink = is_shrink; + result = + yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags); - switch (in->variant_type) { - case YAFFS_OBJECT_TYPE_UNKNOWN: - /* Should not happen */ - break; - case YAFFS_OBJECT_TYPE_FILE: - oh->file_size = - (oh->parent_obj_id == YAFFS_OBJECTID_DELETED - || oh->parent_obj_id == - YAFFS_OBJECTID_UNLINKED) ? 0 : in-> - variant.file_variant.file_size; - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - oh->equiv_id = in->variant.hardlink_variant.equiv_id; - break; - case YAFFS_OBJECT_TYPE_SPECIAL: - /* Do nothing */ - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - /* Do nothing */ - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - alias = in->variant.symlink_variant.alias; - if (!alias) - alias = _Y("no alias"); - yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH); - oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; - break; + if (result != YAFFS_OK) + retval = -ENOENT; + else { + x_buffer = buffer + x_offs; + + if (!obj->xattr_known) { + obj->has_xattr = nval_hasvalues(x_buffer, x_size); + obj->xattr_known = 1; } - /* process any xattrib modifications */ - if (xmod) - yaffs_apply_xattrib_mod(in, (char *)buffer, xmod); + if (name) + retval = nval_get(x_buffer, x_size, name, value, size); + else + retval = nval_list(x_buffer, x_size, value, size); + } + yaffs_release_temp_buffer(dev, (u8 *) buffer, __LINE__); + return retval; +} - /* Tags */ - yaffs_init_tags(&new_tags); - in->serial++; - new_tags.chunk_id = 0; - new_tags.obj_id = in->obj_id; - new_tags.serial_number = in->serial; +int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name, + const void *value, int size, int flags) +{ + return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags); +} - /* Add extra info for file header */ +int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name) +{ + return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0); +} - new_tags.extra_available = 1; - new_tags.extra_parent_id = oh->parent_obj_id; - new_tags.extra_length = oh->file_size; - new_tags.extra_is_shrink = oh->is_shrink; - new_tags.extra_equiv_id = oh->equiv_id; - new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0; - new_tags.extra_obj_type = in->variant_type; +int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value, + int size) +{ + return yaffs_do_xattrib_fetch(obj, name, value, size); +} - yaffs_verify_oh(in, oh, &new_tags, 1); +int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size) +{ + return yaffs_do_xattrib_fetch(obj, NULL, buffer, size); +} - /* Create new chunk in NAND */ - new_chunk_id = - yaffs_write_new_chunk(dev, buffer, &new_tags, - (prev_chunk_id > 0) ? 1 : 0); +static void yaffs_check_obj_details_loaded(struct yaffs_obj *in) +{ + u8 *chunk_data; + struct yaffs_obj_hdr *oh; + struct yaffs_dev *dev; + struct yaffs_ext_tags tags; + int result; + int alloc_failed = 0; - if (new_chunk_id >= 0) { + if (!in) + return; - in->hdr_chunk = new_chunk_id; + dev = in->my_dev; - if (prev_chunk_id > 0) { - yaffs_chunk_del(dev, prev_chunk_id, 1, - __LINE__); - } + if (in->lazy_loaded && in->hdr_chunk > 0) { + in->lazy_loaded = 0; + chunk_data = yaffs_get_temp_buffer(dev, __LINE__); - if (!yaffs_obj_cache_dirty(in)) - in->dirty = 0; + result = + yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, chunk_data, + &tags); + oh = (struct yaffs_obj_hdr *)chunk_data; - /* If this was a shrink, then mark the block that the chunk lives on */ - if (is_shrink) { - bi = yaffs_get_block_info(in->my_dev, - new_chunk_id / - in->my_dev->param. - chunks_per_block); - bi->has_shrink_hdr = 1; - } + in->yst_mode = oh->yst_mode; + yaffs_load_attribs(in, oh); + yaffs_set_obj_name_from_oh(in, oh); + if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) { + in->variant.symlink_variant.alias = + yaffs_clone_str(oh->alias); + if (!in->variant.symlink_variant.alias) + alloc_failed = 1; /* Not returned to caller */ } - ret_val = new_chunk_id; - + yaffs_release_temp_buffer(dev, chunk_data, __LINE__); } - - if (buffer) - yaffs_release_temp_buffer(dev, buffer, __LINE__); - - return ret_val; } -/*------------------------ Short Operations Cache ---------------------------------------- - * In many situations where there is no high level buffering a lot of - * reads might be short sequential reads, and a lot of writes may be short - * sequential writes. eg. scanning/writing a jpeg file. - * In these cases, a short read/write cache can provide a huge perfomance - * benefit with dumb-as-a-rock code. - * In Linux, the page cache provides read buffering and the short op cache - * provides write buffering. - * - * There are a limited number (~10) of cache chunks per device so that we don't - * need a very intelligent search. - */ - -static int yaffs_obj_cache_dirty(struct yaffs_obj *obj) +static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR * name, + const YCHAR * oh_name, int buff_size) { - struct yaffs_dev *dev = obj->my_dev; - int i; - struct yaffs_cache *cache; - int n_caches = obj->my_dev->param.n_caches; - - for (i = 0; i < n_caches; i++) { - cache = &dev->cache[i]; - if (cache->object == obj && cache->dirty) - return 1; - } - - return 0; +#ifdef CONFIG_YAFFS_AUTO_UNICODE + if (dev->param.auto_unicode) { + if (*oh_name) { + /* It is an ASCII name, so do an ASCII to unicode conversion */ + const char *ascii_oh_name = (const char *)oh_name; + int n = buff_size - 1; + while (n > 0 && *ascii_oh_name) { + *name = *ascii_oh_name; + name++; + ascii_oh_name++; + n--; + } + } else { + strncpy(name, oh_name + 1, buff_size - 1); + } + } else { +#else + { +#endif + strncpy(name, oh_name, buff_size - 1); + } } -static void yaffs_flush_file_cache(struct yaffs_obj *obj) +static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR * oh_name, + const YCHAR * name) { - struct yaffs_dev *dev = obj->my_dev; - int lowest = -99; /* Stop compiler whining. */ - int i; - struct yaffs_cache *cache; - int chunk_written = 0; - int n_caches = obj->my_dev->param.n_caches; - - if (n_caches > 0) { - do { - cache = NULL; - - /* Find the dirty cache for this object with the lowest chunk id. */ - for (i = 0; i < n_caches; i++) { - if (dev->cache[i].object == obj && - dev->cache[i].dirty) { - if (!cache - || dev->cache[i].chunk_id < - lowest) { - cache = &dev->cache[i]; - lowest = cache->chunk_id; - } - } - } +#ifdef CONFIG_YAFFS_AUTO_UNICODE - if (cache && !cache->locked) { - /* Write it out and free it up */ + int is_ascii; + YCHAR *w; - chunk_written = - yaffs_wr_data_obj(cache->object, - cache->chunk_id, - cache->data, - cache->n_bytes, 1); - cache->dirty = 0; - cache->object = NULL; - } + if (dev->param.auto_unicode) { - } while (cache && chunk_written > 0); + is_ascii = 1; + w = name; - if (cache) { - /* Hoosterman, disk full while writing cache out. */ - T(YAFFS_TRACE_ERROR, - (TSTR - ("yaffs tragedy: no space during cache write" - TENDSTR))); + /* Figure out if the name will fit in ascii character set */ + while (is_ascii && *w) { + if ((*w) & 0xff00) + is_ascii = 0; + w++; + } + if (is_ascii) { + /* It is an ASCII name, so do a unicode to ascii conversion */ + char *ascii_oh_name = (char *)oh_name; + int n = YAFFS_MAX_NAME_LENGTH - 1; + while (n > 0 && *name) { + *ascii_oh_name = *name; + name++; + ascii_oh_name++; + n--; + } + } else { + /* It is a unicode name, so save starting at the second YCHAR */ + *oh_name = 0; + strncpy(oh_name + 1, name, + YAFFS_MAX_NAME_LENGTH - 2); } - } + } else { +#else + { +#endif + strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1); + } } -/*yaffs_flush_whole_cache(dev) - * - * +/* UpdateObjectHeader updates the header on NAND for an object. + * If name is not NULL, then that new name is used. */ - -void yaffs_flush_whole_cache(struct yaffs_dev *dev) +int yaffs_update_oh(struct yaffs_obj *in, const YCHAR * name, int force, + int is_shrink, int shadows, struct yaffs_xattr_mod *xmod) { - struct yaffs_obj *obj; - int n_caches = dev->param.n_caches; - int i; - /* Find a dirty object in the cache and flush it... - * until there are no further dirty objects. - */ - do { - obj = NULL; - for (i = 0; i < n_caches && !obj; i++) { - if (dev->cache[i].object && dev->cache[i].dirty) - obj = dev->cache[i].object; + struct yaffs_block_info *bi; + + struct yaffs_dev *dev = in->my_dev; + + int prev_chunk_id; + int ret_val = 0; + int result = 0; + + int new_chunk_id; + struct yaffs_ext_tags new_tags; + struct yaffs_ext_tags old_tags; + const YCHAR *alias = NULL; + + u8 *buffer = NULL; + YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1]; - } - if (obj) - yaffs_flush_file_cache(obj); + struct yaffs_obj_hdr *oh = NULL; - } while (obj); + strcpy(old_name, _Y("silly old name")); -} + if (!in->fake || in == dev->root_dir || /* The root_dir should also be saved */ + force || xmod) { -/* Grab us a cache chunk for use. - * First look for an empty one. - * Then look for the least recently used non-dirty one. - * Then look for the least recently used dirty one...., flush and look again. - */ -static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev) -{ - int i; + yaffs_check_gc(dev, 0); + yaffs_check_obj_details_loaded(in); - if (dev->param.n_caches > 0) { - for (i = 0; i < dev->param.n_caches; i++) { - if (!dev->cache[i].object) - return &dev->cache[i]; - } - } + buffer = yaffs_get_temp_buffer(in->my_dev, __LINE__); + oh = (struct yaffs_obj_hdr *)buffer; - return NULL; -} + prev_chunk_id = in->hdr_chunk; -static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev) -{ - struct yaffs_cache *cache; - struct yaffs_obj *the_obj; - int usage; - int i; - int pushout; + if (prev_chunk_id > 0) { + result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id, + buffer, &old_tags); - if (dev->param.n_caches > 0) { - /* Try find a non-dirty one... */ + yaffs_verify_oh(in, oh, &old_tags, 0); - cache = yaffs_grab_chunk_worker(dev); + memcpy(old_name, oh->name, sizeof(oh->name)); + memset(buffer, 0xFF, sizeof(struct yaffs_obj_hdr)); + } else { + memset(buffer, 0xFF, dev->data_bytes_per_chunk); + } - if (!cache) { - /* They were all dirty, find the last recently used object and flush - * its cache, then find again. - * NB what's here is not very accurate, we actually flush the object - * the last recently used page. - */ + oh->type = in->variant_type; + oh->yst_mode = in->yst_mode; + oh->shadows_obj = oh->inband_shadowed_obj_id = shadows; - /* With locking we can't assume we can use entry zero */ + yaffs_load_attribs_oh(oh, in); - the_obj = NULL; - usage = -1; - cache = NULL; - pushout = -1; + if (in->parent) + oh->parent_obj_id = in->parent->obj_id; + else + oh->parent_obj_id = 0; - for (i = 0; i < dev->param.n_caches; i++) { - if (dev->cache[i].object && - !dev->cache[i].locked && - (dev->cache[i].last_use < usage - || !cache)) { - usage = dev->cache[i].last_use; - the_obj = dev->cache[i].object; - cache = &dev->cache[i]; - pushout = i; - } - } + if (name && *name) { + memset(oh->name, 0, sizeof(oh->name)); + yaffs_load_oh_from_name(dev, oh->name, name); + } else if (prev_chunk_id > 0) { + memcpy(oh->name, old_name, sizeof(oh->name)); + } else { + memset(oh->name, 0, sizeof(oh->name)); + } - if (!cache || cache->dirty) { - /* Flush and try again */ - yaffs_flush_file_cache(the_obj); - cache = yaffs_grab_chunk_worker(dev); - } + oh->is_shrink = is_shrink; + switch (in->variant_type) { + case YAFFS_OBJECT_TYPE_UNKNOWN: + /* Should not happen */ + break; + case YAFFS_OBJECT_TYPE_FILE: + oh->file_size = + (oh->parent_obj_id == YAFFS_OBJECTID_DELETED + || oh->parent_obj_id == + YAFFS_OBJECTID_UNLINKED) ? 0 : in-> + variant.file_variant.file_size; + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + oh->equiv_id = in->variant.hardlink_variant.equiv_id; + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + /* Do nothing */ + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + /* Do nothing */ + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + alias = in->variant.symlink_variant.alias; + if (!alias) + alias = _Y("no alias"); + strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH); + oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; + break; } - return cache; - } else { - return NULL; - } -} -/* Find a cached chunk */ -static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj, - int chunk_id) -{ - struct yaffs_dev *dev = obj->my_dev; - int i; - if (dev->param.n_caches > 0) { - for (i = 0; i < dev->param.n_caches; i++) { - if (dev->cache[i].object == obj && - dev->cache[i].chunk_id == chunk_id) { - dev->cache_hits++; + /* process any xattrib modifications */ + if (xmod) + yaffs_apply_xattrib_mod(in, (char *)buffer, xmod); - return &dev->cache[i]; - } - } - } - return NULL; -} + /* Tags */ + yaffs_init_tags(&new_tags); + in->serial++; + new_tags.chunk_id = 0; + new_tags.obj_id = in->obj_id; + new_tags.serial_number = in->serial; -/* Mark the chunk for the least recently used algorithym */ -static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache, - int is_write) -{ + /* Add extra info for file header */ - if (dev->param.n_caches > 0) { - if (dev->cache_last_use < 0 || dev->cache_last_use > 100000000) { - /* Reset the cache usages */ - int i; - for (i = 1; i < dev->param.n_caches; i++) - dev->cache[i].last_use = 0; + new_tags.extra_available = 1; + new_tags.extra_parent_id = oh->parent_obj_id; + new_tags.extra_length = oh->file_size; + new_tags.extra_is_shrink = oh->is_shrink; + new_tags.extra_equiv_id = oh->equiv_id; + new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0; + new_tags.extra_obj_type = in->variant_type; - dev->cache_last_use = 0; - } + yaffs_verify_oh(in, oh, &new_tags, 1); - dev->cache_last_use++; + /* Create new chunk in NAND */ + new_chunk_id = + yaffs_write_new_chunk(dev, buffer, &new_tags, + (prev_chunk_id > 0) ? 1 : 0); - cache->last_use = dev->cache_last_use; + if (new_chunk_id >= 0) { - if (is_write) - cache->dirty = 1; - } -} + in->hdr_chunk = new_chunk_id; -/* Invalidate a single cache page. - * Do this when a whole page gets written, - * ie the short cache for this page is no longer valid. - */ -static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id) -{ - if (object->my_dev->param.n_caches > 0) { - struct yaffs_cache *cache = - yaffs_find_chunk_cache(object, chunk_id); + if (prev_chunk_id > 0) { + yaffs_chunk_del(dev, prev_chunk_id, 1, + __LINE__); + } - if (cache) - cache->object = NULL; - } -} + if (!yaffs_obj_cache_dirty(in)) + in->dirty = 0; -/* Invalidate all the cache pages associated with this object - * Do this whenever ther file is deleted or resized. - */ -static void yaffs_invalidate_whole_cache(struct yaffs_obj *in) -{ - int i; - struct yaffs_dev *dev = in->my_dev; + /* If this was a shrink, then mark the block that the chunk lives on */ + if (is_shrink) { + bi = yaffs_get_block_info(in->my_dev, + new_chunk_id / + in->my_dev->param. + chunks_per_block); + bi->has_shrink_hdr = 1; + } - if (dev->param.n_caches > 0) { - /* Invalidate it. */ - for (i = 0; i < dev->param.n_caches; i++) { - if (dev->cache[i].object == in) - dev->cache[i].object = NULL; } + + ret_val = new_chunk_id; + } + + if (buffer) + yaffs_release_temp_buffer(dev, buffer, __LINE__); + + return ret_val; } /*--------------------- File read/write ------------------------ @@ -3699,44 +3954,23 @@ int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync) if (in->dirty) { yaffs_flush_file_cache(in); if (data_sync) /* Only sync data */ - ret_val = YAFFS_OK; - else { - if (update_time) - yaffs_load_current_time(in, 0, 0); - - ret_val = (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= - 0) ? YAFFS_OK : YAFFS_FAIL; - } - } else { - ret_val = YAFFS_OK; - } - - return ret_val; - -} - -static int yaffs_generic_obj_del(struct yaffs_obj *in) -{ - - /* First off, invalidate the file's data in the cache, without flushing. */ - yaffs_invalidate_whole_cache(in); - - if (in->my_dev->param.is_yaffs2 && (in->parent != in->my_dev->del_dir)) { - /* Move to the unlinked directory so we have a record that it was deleted. */ - yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0, - 0); + ret_val = YAFFS_OK; + else { + if (update_time) + yaffs_load_current_time(in, 0, 0); + ret_val = (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= + 0) ? YAFFS_OK : YAFFS_FAIL; + } + } else { + ret_val = YAFFS_OK; } - yaffs_remove_obj_from_dir(in); - yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__); - in->hdr_chunk = 0; - - yaffs_free_obj(in); - return YAFFS_OK; + return ret_val; } + /* yaffs_del_file deletes the whole file data * and the inode associated with the file. * It does not delete the links associated with the file. @@ -3826,7 +4060,7 @@ static int yaffs_del_dir(struct yaffs_obj *obj) static int yaffs_del_symlink(struct yaffs_obj *in) { if (in->variant.symlink_variant.alias) - YFREE(in->variant.symlink_variant.alias); + kfree(in->variant.symlink_variant.alias); in->variant.symlink_variant.alias = NULL; return yaffs_generic_obj_del(in); @@ -3971,6 +4205,82 @@ int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name) return yaffs_unlink_obj(obj); } +/* Note: + * If old_name is NULL then we take old_dir as the object to be renamed. + */ +int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name, + struct yaffs_obj *new_dir, const YCHAR * new_name) +{ + struct yaffs_obj *obj = NULL; + struct yaffs_obj *existing_target = NULL; + int force = 0; + int result; + struct yaffs_dev *dev; + + if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) + YBUG(); + if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) + YBUG(); + + dev = old_dir->my_dev; + +#ifdef CONFIG_YAFFS_CASE_INSENSITIVE + /* Special case for case insemsitive systems. + * While look-up is case insensitive, the name isn't. + * Therefore we might want to change x.txt to X.txt + */ + if (old_dir == new_dir && + old_name && new_name && + strcmp(old_name, new_name) == 0) + force = 1; +#endif + + if (strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) > + YAFFS_MAX_NAME_LENGTH) + /* ENAMETOOLONG */ + return YAFFS_FAIL; + + if(old_name) + obj = yaffs_find_by_name(old_dir, old_name); + else{ + obj = old_dir; + old_dir = obj->parent; + } + + + if (obj && obj->rename_allowed) { + + /* Now do the handling for an existing target, if there is one */ + + existing_target = yaffs_find_by_name(new_dir, new_name); + if (yaffs_is_non_empty_dir(existing_target)){ + return YAFFS_FAIL; /* ENOTEMPTY */ + } else if (existing_target && existing_target != obj) { + /* Nuke the target first, using shadowing, + * but only if it isn't the same object. + * + * Note we must disable gc otherwise it can mess up the shadowing. + * + */ + dev->gc_disable = 1; + yaffs_change_obj_name(obj, new_dir, new_name, force, + existing_target->obj_id); + existing_target->is_shadowed = 1; + yaffs_unlink_obj(existing_target); + dev->gc_disable = 0; + } + + result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0); + + yaffs_update_parent(old_dir); + if (new_dir != old_dir) + yaffs_update_parent(new_dir); + + return result; + } + return YAFFS_FAIL; +} + /*----------------------- Initialisation Scanning ---------------------- */ void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id, @@ -4143,216 +4453,52 @@ static void yaffs_fix_hanging_objs(struct yaffs_dev *dev) T(YAFFS_TRACE_SCAN, (TSTR ("Hanging object %d moved to lost and found" - TENDSTR), obj->obj_id)); - yaffs_add_obj_to_dir(dev->lost_n_found, - obj); - } - } - } - } -} - -/* - * Delete directory contents for cleaning up lost and found. - */ -static void yaffs_del_dir_contents(struct yaffs_obj *dir) -{ - struct yaffs_obj *obj; - struct list_head *lh; - struct list_head *n; - - if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) - YBUG(); - - list_for_each_safe(lh, n, &dir->variant.dir_variant.children) { - if (lh) { - obj = list_entry(lh, struct yaffs_obj, siblings); - if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) - yaffs_del_dir_contents(obj); - - T(YAFFS_TRACE_SCAN, - (TSTR("Deleting lost_found object %d" TENDSTR), - obj->obj_id)); - - /* Need to use UnlinkObject since Delete would not handle - * hardlinked objects correctly. - */ - yaffs_unlink_obj(obj); - } - } - -} - -static void yaffs_empty_l_n_f(struct yaffs_dev *dev) -{ - yaffs_del_dir_contents(dev->lost_n_found); -} - -static void yaffs_check_obj_details_loaded(struct yaffs_obj *in) -{ - u8 *chunk_data; - struct yaffs_obj_hdr *oh; - struct yaffs_dev *dev; - struct yaffs_ext_tags tags; - int result; - int alloc_failed = 0; - - if (!in) - return; - - dev = in->my_dev; - - if (in->lazy_loaded && in->hdr_chunk > 0) { - in->lazy_loaded = 0; - chunk_data = yaffs_get_temp_buffer(dev, __LINE__); - - result = - yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, chunk_data, - &tags); - oh = (struct yaffs_obj_hdr *)chunk_data; - - in->yst_mode = oh->yst_mode; - yaffs_load_attribs(in, oh); - yaffs_set_obj_name_from_oh(in, oh); - - if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) { - in->variant.symlink_variant.alias = - yaffs_clone_str(oh->alias); - if (!in->variant.symlink_variant.alias) - alloc_failed = 1; /* Not returned to caller */ - } - - yaffs_release_temp_buffer(dev, chunk_data, __LINE__); - } -} - -/*------------------------------ Directory Functions ----------------------------- */ - -/* - *yaffs_update_parent() handles fixing a directories mtime and ctime when a new - * link (ie. name) is created or deleted in the directory. - * - * ie. - * create dir/a : update dir's mtime/ctime - * rm dir/a: update dir's mtime/ctime - * modify dir/a: don't update dir's mtimme/ctime - * - * This can be handled immediately or defered. Defering helps reduce the number - * of updates when many files in a directory are changed within a brief period. - * - * If the directory updating is defered then yaffs_update_dirty_dirs must be - * called periodically. - */ - -static void yaffs_update_parent(struct yaffs_obj *obj) -{ - struct yaffs_dev *dev; - if (!obj) - return; - dev = obj->my_dev; - obj->dirty = 1; - yaffs_load_current_time(obj, 0, 1); - if (dev->param.defered_dir_update) { - struct list_head *link = &obj->variant.dir_variant.dirty; - - if (list_empty(link)) { - list_add(link, &dev->dirty_dirs); - T(YAFFS_TRACE_BACKGROUND, - (TSTR("Added object %d to dirty directories" TENDSTR), - obj->obj_id)); - } - - } else { - yaffs_update_oh(obj, NULL, 0, 0, 0, NULL); - } -} - -void yaffs_update_dirty_dirs(struct yaffs_dev *dev) -{ - struct list_head *link; - struct yaffs_obj *obj; - struct yaffs_dir_var *d_s; - union yaffs_obj_var *o_v; - - T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR))); - - while (!list_empty(&dev->dirty_dirs)) { - link = dev->dirty_dirs.next; - list_del_init(link); - - d_s = list_entry(link, struct yaffs_dir_var, dirty); - o_v = list_entry(d_s, union yaffs_obj_var, dir_variant); - obj = list_entry(o_v, struct yaffs_obj, variant); - - T(YAFFS_TRACE_BACKGROUND, - (TSTR("Update directory %d" TENDSTR), obj->obj_id)); - - if (obj->dirty) - yaffs_update_oh(obj, NULL, 0, 0, 0, NULL); - } -} - -static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj) -{ - struct yaffs_dev *dev = obj->my_dev; - struct yaffs_obj *parent; - - yaffs_verify_obj_in_dir(obj); - parent = obj->parent; - - yaffs_verify_dir(parent); - - if (dev && dev->param.remove_obj_fn) - dev->param.remove_obj_fn(obj); - - list_del_init(&obj->siblings); - obj->parent = NULL; - - yaffs_verify_dir(parent); + TENDSTR), obj->obj_id)); + yaffs_add_obj_to_dir(dev->lost_n_found, + obj); + } + } + } + } } -void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj) +/* + * Delete directory contents for cleaning up lost and found. + */ +static void yaffs_del_dir_contents(struct yaffs_obj *dir) { - if (!directory) { - T(YAFFS_TRACE_ALWAYS, - (TSTR - ("tragedy: Trying to add an object to a null pointer directory" - TENDSTR))); - YBUG(); - return; - } - if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { - T(YAFFS_TRACE_ALWAYS, - (TSTR - ("tragedy: Trying to add an object to a non-directory" - TENDSTR))); - YBUG(); - } + struct yaffs_obj *obj; + struct list_head *lh; + struct list_head *n; - if (obj->siblings.prev == NULL) { - /* Not initialised */ + if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) YBUG(); - } - - yaffs_verify_dir(directory); - yaffs_remove_obj_from_dir(obj); + list_for_each_safe(lh, n, &dir->variant.dir_variant.children) { + if (lh) { + obj = list_entry(lh, struct yaffs_obj, siblings); + if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) + yaffs_del_dir_contents(obj); - /* Now add it */ - list_add(&obj->siblings, &directory->variant.dir_variant.children); - obj->parent = directory; + T(YAFFS_TRACE_SCAN, + (TSTR("Deleting lost_found object %d" TENDSTR), + obj->obj_id)); - if (directory == obj->my_dev->unlinked_dir - || directory == obj->my_dev->del_dir) { - obj->unlinked = 1; - obj->my_dev->n_unlinked_files++; - obj->rename_allowed = 0; + /* Need to use UnlinkObject since Delete would not handle + * hardlinked objects correctly. + */ + yaffs_unlink_obj(obj); + } } - yaffs_verify_dir(directory); - yaffs_verify_obj_in_dir(obj); } +static void yaffs_empty_l_n_f(struct yaffs_dev *dev) +{ + yaffs_del_dir_contents(dev->lost_n_found); +} + + struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory, const YCHAR * name) { @@ -4393,16 +4539,16 @@ struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory, /* Special case for lost-n-found */ if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) { - if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME)) + if (!strcmp(name, YAFFS_LOSTNFOUND_NAME)) return l; - } else if (yaffs_sum_cmp(l->sum, sum) + } else if (l->sum == sum || l->hdr_chunk <= 0) { /* LostnFound chunk called Objxxx * Do a real check */ yaffs_get_obj_name(l, buffer, YAFFS_MAX_NAME_LENGTH + 1); - if (yaffs_strncmp + if (strncmp (name, buffer, YAFFS_MAX_NAME_LENGTH) == 0) return l; } @@ -4449,7 +4595,7 @@ static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size) { /* Create an object name if we could not find one. */ - if (yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) { + if (strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) { YCHAR local_name[20]; YCHAR num_string[20]; YCHAR *x = &num_string[19]; @@ -4461,83 +4607,12 @@ static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR * name, v /= 10; } /* make up a name */ - yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX); - yaffs_strcat(local_name, x); - yaffs_strncpy(name, local_name, buffer_size - 1); + strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX); + strcat(local_name, x); + strncpy(name, local_name, buffer_size - 1); } } -static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR * name, - const YCHAR * oh_name, int buff_size) -{ -#ifdef CONFIG_YAFFS_AUTO_UNICODE - if (dev->param.auto_unicode) { - if (*oh_name) { - /* It is an ASCII name, so do an ASCII to unicode conversion */ - const char *ascii_oh_name = (const char *)oh_name; - int n = buff_size - 1; - while (n > 0 && *ascii_oh_name) { - *name = *ascii_oh_name; - name++; - ascii_oh_name++; - n--; - } - } else { - yaffs_strncpy(name, oh_name + 1, buff_size - 1); - } - } else { -#else - { -#endif - yaffs_strncpy(name, oh_name, buff_size - 1); - } -} - -static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR * oh_name, - const YCHAR * name) -{ -#ifdef CONFIG_YAFFS_AUTO_UNICODE - - int is_ascii; - YCHAR *w; - - if (dev->param.auto_unicode) { - - is_ascii = 1; - w = name; - - /* Figure out if the name will fit in ascii character set */ - while (is_ascii && *w) { - if ((*w) & 0xff00) - is_ascii = 0; - w++; - } - - if (is_ascii) { - /* It is an ASCII name, so do a unicode to ascii conversion */ - char *ascii_oh_name = (char *)oh_name; - int n = YAFFS_MAX_NAME_LENGTH - 1; - while (n > 0 && *name) { - *ascii_oh_name = *name; - name++; - ascii_oh_name++; - n--; - } - } else { - /* It is a unicode name, so save starting at the second YCHAR */ - *oh_name = 0; - yaffs_strncpy(oh_name + 1, name, - YAFFS_MAX_NAME_LENGTH - 2); - } - } else { -#else - { -#endif - yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1); - } - -} - int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size) { memset(name, 0, buffer_size * sizeof(YCHAR)); @@ -4545,11 +4620,11 @@ int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size) yaffs_check_obj_details_loaded(obj); if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) { - yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1); + strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1); } #ifndef CONFIG_YAFFS_NO_SHORT_NAMES else if (obj->short_name[0]) { - yaffs_strcpy(name, obj->short_name); + strcpy(name, obj->short_name); } #endif else if (obj->hdr_chunk > 0) { @@ -4573,7 +4648,7 @@ int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size) yaffs_fix_null_name(obj, name, buffer_size); - return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH); + return strnlen(name, YAFFS_MAX_NAME_LENGTH); } int yaffs_get_obj_length(struct yaffs_obj *obj) @@ -4586,7 +4661,7 @@ int yaffs_get_obj_length(struct yaffs_obj *obj) if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) { if (!obj->variant.symlink_variant.alias) return 0; - return yaffs_strnlen(obj->variant.symlink_variant.alias, + return strnlen(obj->variant.symlink_variant.alias, YAFFS_MAX_ALIAS_LENGTH); } else { /* Only a directory should drop through to here */ @@ -4656,130 +4731,7 @@ YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj) return yaffs_clone_str(_Y("")); } -static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set, - const YCHAR * name, const void *value, int size, - int flags) -{ - struct yaffs_xattr_mod xmod; - - int result; - - xmod.set = set; - xmod.name = name; - xmod.data = value; - xmod.size = size; - xmod.flags = flags; - xmod.result = -ENOSPC; - - result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod); - - if (result > 0) - return xmod.result; - else - return -ENOSPC; -} - -static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer, - struct yaffs_xattr_mod *xmod) -{ - int retval = 0; - int x_offs = sizeof(struct yaffs_obj_hdr); - struct yaffs_dev *dev = obj->my_dev; - int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr); - - char *x_buffer = buffer + x_offs; - - if (xmod->set) - retval = - nval_set(x_buffer, x_size, xmod->name, xmod->data, - xmod->size, xmod->flags); - else - retval = nval_del(x_buffer, x_size, xmod->name); - - obj->has_xattr = nval_hasvalues(x_buffer, x_size); - obj->xattr_known = 1; - - xmod->result = retval; - - return retval; -} - -static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR * name, - void *value, int size) -{ - char *buffer = NULL; - int result; - struct yaffs_ext_tags tags; - struct yaffs_dev *dev = obj->my_dev; - int x_offs = sizeof(struct yaffs_obj_hdr); - int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr); - - char *x_buffer; - - int retval = 0; - - if (obj->hdr_chunk < 1) - return -ENODATA; - - /* If we know that the object has no xattribs then don't do all the - * reading and parsing. - */ - if (obj->xattr_known && !obj->has_xattr) { - if (name) - return -ENODATA; - else - return 0; - } - - buffer = (char *)yaffs_get_temp_buffer(dev, __LINE__); - if (!buffer) - return -ENOMEM; - - result = - yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags); - - if (result != YAFFS_OK) - retval = -ENOENT; - else { - x_buffer = buffer + x_offs; - - if (!obj->xattr_known) { - obj->has_xattr = nval_hasvalues(x_buffer, x_size); - obj->xattr_known = 1; - } - - if (name) - retval = nval_get(x_buffer, x_size, name, value, size); - else - retval = nval_list(x_buffer, x_size, value, size); - } - yaffs_release_temp_buffer(dev, (u8 *) buffer, __LINE__); - return retval; -} - -int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name, - const void *value, int size, int flags) -{ - return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags); -} - -int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name) -{ - return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0); -} - -int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value, - int size) -{ - return yaffs_do_xattrib_fetch(obj, name, value, size); -} - -int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size) -{ - return yaffs_do_xattrib_fetch(obj, NULL, buffer, size); -} - -/*---------------------------- Initialisation code -------------------------------------- */ +/*--------------------------- Initialisation code -------------------------- */ static int yaffs_check_dev_fns(const struct yaffs_dev *dev) { @@ -5022,7 +4974,7 @@ int yaffs_guts_initialise(struct yaffs_dev *dev) if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES) dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES; - dev->cache = YMALLOC(cache_bytes); + dev->cache = kmalloc(cache_bytes, GFP_NOFS); buf = (u8 *) dev->cache; @@ -5034,7 +4986,7 @@ int yaffs_guts_initialise(struct yaffs_dev *dev) dev->cache[i].last_use = 0; dev->cache[i].dirty = 0; dev->cache[i].data = buf = - YMALLOC_DMA(dev->param.total_bytes_per_chunk); + kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS); } if (!buf) init_failed = 1; @@ -5046,7 +4998,8 @@ int yaffs_guts_initialise(struct yaffs_dev *dev) if (!init_failed) { dev->gc_cleanup_list = - YMALLOC(dev->param.chunks_per_block * sizeof(u32)); + kmalloc(dev->param.chunks_per_block * sizeof(u32), + GFP_NOFS); if (!dev->gc_cleanup_list) init_failed = 1; } @@ -5152,18 +5105,18 @@ void yaffs_deinitialise(struct yaffs_dev *dev) for (i = 0; i < dev->param.n_caches; i++) { if (dev->cache[i].data) - YFREE(dev->cache[i].data); + kfree(dev->cache[i].data); dev->cache[i].data = NULL; } - YFREE(dev->cache); + kfree(dev->cache); dev->cache = NULL; } - YFREE(dev->gc_cleanup_list); + kfree(dev->gc_cleanup_list); for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) - YFREE(dev->temp_buffer[i].buffer); + kfree(dev->temp_buffer[i].buffer); dev->is_mounted = 0;