u32 datablock_size;
};
-static int btrfsic_process_metablock(struct btrfsic_state *state,
- struct btrfsic_block *block,
- struct btrfsic_block_data_ctx *block_ctx,
- int limit_nesting, int force_iodone_flag);
-static void btrfsic_read_from_block_data(
- struct btrfsic_block_data_ctx *block_ctx,
- void *dst, u32 offset, size_t len);
-static int btrfsic_create_link_to_next_block(
- struct btrfsic_state *state,
- struct btrfsic_block *block,
- struct btrfsic_block_data_ctx
- *block_ctx, u64 next_bytenr,
- int limit_nesting,
- struct btrfsic_block_data_ctx *next_block_ctx,
- struct btrfsic_block **next_blockp,
- int force_iodone_flag,
- int *num_copiesp, int *mirror_nump,
- struct btrfs_disk_key *disk_key,
- u64 parent_generation);
-static int btrfsic_handle_extent_data(struct btrfsic_state *state,
- struct btrfsic_block *block,
- struct btrfsic_block_data_ctx *block_ctx,
- u32 item_offset, int force_iodone_flag);
-static int btrfsic_map_block(struct btrfsic_state *state, u64 bytenr, u32 len,
- struct btrfsic_block_data_ctx *block_ctx_out,
- int mirror_num);
-static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx);
-static int btrfsic_read_block(struct btrfsic_state *state,
- struct btrfsic_block_data_ctx *block_ctx);
-static void btrfsic_print_add_link(const struct btrfsic_state *state,
- const struct btrfsic_block_link *l);
static void btrfsic_print_rem_link(const struct btrfsic_state *state,
const struct btrfsic_block_link *l);
static char btrfsic_get_block_type(const struct btrfsic_state *state,
const struct btrfsic_block *block);
-static void btrfsic_dump_tree(const struct btrfsic_state *state);
-static void btrfsic_dump_tree_sub(const struct btrfsic_state *state,
- const struct btrfsic_block *block,
- int indent_level);
-static struct btrfsic_block_link *btrfsic_block_link_lookup_or_add(
- struct btrfsic_state *state,
- struct btrfsic_block_data_ctx *next_block_ctx,
- struct btrfsic_block *next_block,
- struct btrfsic_block *from_block,
- u64 parent_generation);
-static struct btrfsic_block *btrfsic_block_lookup_or_add(
- struct btrfsic_state *state,
- struct btrfsic_block_data_ctx *block_ctx,
- const char *additional_string,
- int is_metadata,
- int is_iodone,
- int never_written,
- int mirror_num,
- int *was_created);
-static int btrfsic_process_superblock_dev_mirror(
- struct btrfsic_state *state,
- struct btrfsic_dev_state *dev_state,
- struct btrfs_device *device,
- int superblock_mirror_num,
- struct btrfsic_dev_state **selected_dev_state,
- struct btrfs_super_block *selected_super);
-static struct btrfsic_dev_state *btrfsic_dev_state_lookup(dev_t dev);
-
static struct mutex btrfsic_mutex;
static int btrfsic_is_initialized;
static struct btrfsic_dev_state_hashtable btrfsic_dev_state_hashtable;
-static void btrfsic_block_init(struct btrfsic_block *b)
-{
- b->magic_num = BTRFSIC_BLOCK_MAGIC_NUMBER;
- b->dev_state = NULL;
- b->dev_bytenr = 0;
- b->logical_bytenr = 0;
- b->generation = BTRFSIC_GENERATION_UNKNOWN;
- b->disk_key.objectid = 0;
- b->disk_key.type = 0;
- b->disk_key.offset = 0;
- b->is_metadata = 0;
- b->is_superblock = 0;
- b->is_iodone = 0;
- b->iodone_w_error = 0;
- b->never_written = 0;
- b->mirror_num = 0;
- b->next_in_same_bio = NULL;
- b->orig_bio_private = NULL;
- b->orig_bio_end_io = NULL;
- INIT_LIST_HEAD(&b->collision_resolving_node);
- INIT_LIST_HEAD(&b->all_blocks_node);
- INIT_LIST_HEAD(&b->ref_to_list);
- INIT_LIST_HEAD(&b->ref_from_list);
- b->submit_bio_bh_rw = 0;
- b->flush_gen = 0;
-}
-
-static struct btrfsic_block *btrfsic_block_alloc(void)
-{
- struct btrfsic_block *b;
-
- b = kzalloc(sizeof(*b), GFP_NOFS);
- if (NULL != b)
- btrfsic_block_init(b);
-
- return b;
-}
-
static void btrfsic_block_free(struct btrfsic_block *b)
{
BUG_ON(!(NULL == b || BTRFSIC_BLOCK_MAGIC_NUMBER == b->magic_num));
kfree(b);
}
-static void btrfsic_block_link_init(struct btrfsic_block_link *l)
-{
- l->magic_num = BTRFSIC_BLOCK_LINK_MAGIC_NUMBER;
- l->ref_cnt = 1;
- INIT_LIST_HEAD(&l->node_ref_to);
- INIT_LIST_HEAD(&l->node_ref_from);
- INIT_LIST_HEAD(&l->collision_resolving_node);
- l->block_ref_to = NULL;
- l->block_ref_from = NULL;
-}
-
-static struct btrfsic_block_link *btrfsic_block_link_alloc(void)
-{
- struct btrfsic_block_link *l;
-
- l = kzalloc(sizeof(*l), GFP_NOFS);
- if (NULL != l)
- btrfsic_block_link_init(l);
-
- return l;
-}
-
static void btrfsic_block_link_free(struct btrfsic_block_link *l)
{
BUG_ON(!(NULL == l || BTRFSIC_BLOCK_LINK_MAGIC_NUMBER == l->magic_num));
kfree(l);
}
-static void btrfsic_dev_state_init(struct btrfsic_dev_state *ds)
-{
- ds->magic_num = BTRFSIC_DEV2STATE_MAGIC_NUMBER;
- ds->bdev = NULL;
- ds->state = NULL;
- INIT_LIST_HEAD(&ds->collision_resolving_node);
- ds->last_flush_gen = 0;
- btrfsic_block_init(&ds->dummy_block_for_bio_bh_flush);
- ds->dummy_block_for_bio_bh_flush.is_iodone = 1;
- ds->dummy_block_for_bio_bh_flush.dev_state = ds;
-}
-
-static struct btrfsic_dev_state *btrfsic_dev_state_alloc(void)
-{
- struct btrfsic_dev_state *ds;
-
- ds = kzalloc(sizeof(*ds), GFP_NOFS);
- if (NULL != ds)
- btrfsic_dev_state_init(ds);
-
- return ds;
-}
-
static void btrfsic_dev_state_free(struct btrfsic_dev_state *ds)
{
BUG_ON(!(NULL == ds ||
kfree(ds);
}
-static void btrfsic_block_hashtable_init(struct btrfsic_block_hashtable *h)
-{
- int i;
-
- for (i = 0; i < BTRFSIC_BLOCK_HASHTABLE_SIZE; i++)
- INIT_LIST_HEAD(h->table + i);
-}
-
-static void btrfsic_block_hashtable_add(struct btrfsic_block *b,
- struct btrfsic_block_hashtable *h)
-{
- const unsigned int hashval =
- (((unsigned int)(b->dev_bytenr >> 16)) ^
- ((unsigned int)((uintptr_t)b->dev_state->bdev))) &
- (BTRFSIC_BLOCK_HASHTABLE_SIZE - 1);
-
- list_add(&b->collision_resolving_node, h->table + hashval);
-}
-
-static struct btrfsic_block *btrfsic_block_hashtable_lookup(
- struct block_device *bdev,
- u64 dev_bytenr,
- struct btrfsic_block_hashtable *h)
-{
- const unsigned int hashval =
- (((unsigned int)(dev_bytenr >> 16)) ^
- ((unsigned int)((uintptr_t)bdev))) &
- (BTRFSIC_BLOCK_HASHTABLE_SIZE - 1);
- struct btrfsic_block *b;
-
- list_for_each_entry(b, h->table + hashval, collision_resolving_node) {
- if (b->dev_state->bdev == bdev && b->dev_bytenr == dev_bytenr)
- return b;
- }
-
- return NULL;
-}
-
-static void btrfsic_block_link_hashtable_init(
- struct btrfsic_block_link_hashtable *h)
-{
- int i;
-
- for (i = 0; i < BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE; i++)
- INIT_LIST_HEAD(h->table + i);
-}
-
-static void btrfsic_block_link_hashtable_add(
- struct btrfsic_block_link *l,
- struct btrfsic_block_link_hashtable *h)
-{
- const unsigned int hashval =
- (((unsigned int)(l->block_ref_to->dev_bytenr >> 16)) ^
- ((unsigned int)(l->block_ref_from->dev_bytenr >> 16)) ^
- ((unsigned int)((uintptr_t)l->block_ref_to->dev_state->bdev)) ^
- ((unsigned int)((uintptr_t)l->block_ref_from->dev_state->bdev)))
- & (BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE - 1);
-
- BUG_ON(NULL == l->block_ref_to);
- BUG_ON(NULL == l->block_ref_from);
- list_add(&l->collision_resolving_node, h->table + hashval);
-}
-
-static struct btrfsic_block_link *btrfsic_block_link_hashtable_lookup(
- struct block_device *bdev_ref_to,
- u64 dev_bytenr_ref_to,
- struct block_device *bdev_ref_from,
- u64 dev_bytenr_ref_from,
- struct btrfsic_block_link_hashtable *h)
-{
- const unsigned int hashval =
- (((unsigned int)(dev_bytenr_ref_to >> 16)) ^
- ((unsigned int)(dev_bytenr_ref_from >> 16)) ^
- ((unsigned int)((uintptr_t)bdev_ref_to)) ^
- ((unsigned int)((uintptr_t)bdev_ref_from))) &
- (BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE - 1);
- struct btrfsic_block_link *l;
-
- list_for_each_entry(l, h->table + hashval, collision_resolving_node) {
- BUG_ON(NULL == l->block_ref_to);
- BUG_ON(NULL == l->block_ref_from);
- if (l->block_ref_to->dev_state->bdev == bdev_ref_to &&
- l->block_ref_to->dev_bytenr == dev_bytenr_ref_to &&
- l->block_ref_from->dev_state->bdev == bdev_ref_from &&
- l->block_ref_from->dev_bytenr == dev_bytenr_ref_from)
- return l;
- }
-
- return NULL;
-}
-
-static void btrfsic_dev_state_hashtable_init(
- struct btrfsic_dev_state_hashtable *h)
-{
- int i;
-
- for (i = 0; i < BTRFSIC_DEV2STATE_HASHTABLE_SIZE; i++)
- INIT_LIST_HEAD(h->table + i);
-}
-
-static void btrfsic_dev_state_hashtable_add(
- struct btrfsic_dev_state *ds,
- struct btrfsic_dev_state_hashtable *h)
-{
- const unsigned int hashval =
- (((unsigned int)((uintptr_t)ds->bdev->bd_dev)) &
- (BTRFSIC_DEV2STATE_HASHTABLE_SIZE - 1));
-
- list_add(&ds->collision_resolving_node, h->table + hashval);
-}
-
static void btrfsic_dev_state_hashtable_remove(struct btrfsic_dev_state *ds)
{
list_del(&ds->collision_resolving_node);
return NULL;
}
-static int btrfsic_process_superblock(struct btrfsic_state *state,
- struct btrfs_fs_devices *fs_devices)
-{
- struct btrfs_super_block *selected_super;
- struct list_head *dev_head = &fs_devices->devices;
- struct btrfs_device *device;
- struct btrfsic_dev_state *selected_dev_state = NULL;
- int ret = 0;
- int pass;
-
- selected_super = kzalloc(sizeof(*selected_super), GFP_NOFS);
- if (!selected_super)
- return -ENOMEM;
-
- list_for_each_entry(device, dev_head, dev_list) {
- int i;
- struct btrfsic_dev_state *dev_state;
-
- if (!device->bdev || !device->name)
- continue;
-
- dev_state = btrfsic_dev_state_lookup(device->bdev->bd_dev);
- BUG_ON(NULL == dev_state);
- for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
- ret = btrfsic_process_superblock_dev_mirror(
- state, dev_state, device, i,
- &selected_dev_state, selected_super);
- if (0 != ret && 0 == i) {
- kfree(selected_super);
- return ret;
- }
- }
- }
-
- if (NULL == state->latest_superblock) {
- pr_info("btrfsic: no superblock found!\n");
- kfree(selected_super);
- return -1;
- }
-
- for (pass = 0; pass < 3; pass++) {
- int num_copies;
- int mirror_num;
- u64 next_bytenr;
-
- switch (pass) {
- case 0:
- next_bytenr = btrfs_super_root(selected_super);
- if (state->print_mask &
- BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
- pr_info("root@%llu\n", next_bytenr);
- break;
- case 1:
- next_bytenr = btrfs_super_chunk_root(selected_super);
- if (state->print_mask &
- BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
- pr_info("chunk@%llu\n", next_bytenr);
- break;
- case 2:
- next_bytenr = btrfs_super_log_root(selected_super);
- if (0 == next_bytenr)
- continue;
- if (state->print_mask &
- BTRFSIC_PRINT_MASK_ROOT_CHUNK_LOG_TREE_LOCATION)
- pr_info("log@%llu\n", next_bytenr);
- break;
- }
-
- num_copies = btrfs_num_copies(state->fs_info, next_bytenr,
- state->metablock_size);
- if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
- pr_info("num_copies(log_bytenr=%llu) = %d\n",
- next_bytenr, num_copies);
-
- for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
- struct btrfsic_block *next_block;
- struct btrfsic_block_data_ctx tmp_next_block_ctx;
- struct btrfsic_block_link *l;
-
- ret = btrfsic_map_block(state, next_bytenr,
- state->metablock_size,
- &tmp_next_block_ctx,
- mirror_num);
- if (ret) {
- pr_info("btrfsic: btrfsic_map_block(root @%llu, mirror %d) failed!\n",
- next_bytenr, mirror_num);
- kfree(selected_super);
- return -1;
- }
-
- next_block = btrfsic_block_hashtable_lookup(
- tmp_next_block_ctx.dev->bdev,
- tmp_next_block_ctx.dev_bytenr,
- &state->block_hashtable);
- BUG_ON(NULL == next_block);
-
- l = btrfsic_block_link_hashtable_lookup(
- tmp_next_block_ctx.dev->bdev,
- tmp_next_block_ctx.dev_bytenr,
- state->latest_superblock->dev_state->
- bdev,
- state->latest_superblock->dev_bytenr,
- &state->block_link_hashtable);
- BUG_ON(NULL == l);
-
- ret = btrfsic_read_block(state, &tmp_next_block_ctx);
- if (ret < (int)PAGE_SIZE) {
- pr_info("btrfsic: read @logical %llu failed!\n",
- tmp_next_block_ctx.start);
- btrfsic_release_block_ctx(&tmp_next_block_ctx);
- kfree(selected_super);
- return -1;
- }
-
- ret = btrfsic_process_metablock(state,
- next_block,
- &tmp_next_block_ctx,
- BTRFS_MAX_LEVEL + 3, 1);
- btrfsic_release_block_ctx(&tmp_next_block_ctx);
- }
- }
-
- kfree(selected_super);
- return ret;
-}
-
-static int btrfsic_process_superblock_dev_mirror(
- struct btrfsic_state *state,
- struct btrfsic_dev_state *dev_state,
- struct btrfs_device *device,
- int superblock_mirror_num,
- struct btrfsic_dev_state **selected_dev_state,
- struct btrfs_super_block *selected_super)
-{
- struct btrfs_fs_info *fs_info = state->fs_info;
- struct btrfs_super_block *super_tmp;
- u64 dev_bytenr;
- struct btrfsic_block *superblock_tmp;
- int pass;
- struct block_device *const superblock_bdev = device->bdev;
- struct page *page;
- struct address_space *mapping = superblock_bdev->bd_inode->i_mapping;
- int ret = 0;
-
- /* super block bytenr is always the unmapped device bytenr */
- dev_bytenr = btrfs_sb_offset(superblock_mirror_num);
- if (dev_bytenr + BTRFS_SUPER_INFO_SIZE > device->commit_total_bytes)
- return -1;
-
- page = read_cache_page_gfp(mapping, dev_bytenr >> PAGE_SHIFT, GFP_NOFS);
- if (IS_ERR(page))
- return -1;
-
- super_tmp = page_address(page);
-
- if (btrfs_super_bytenr(super_tmp) != dev_bytenr ||
- btrfs_super_magic(super_tmp) != BTRFS_MAGIC ||
- memcmp(device->uuid, super_tmp->dev_item.uuid, BTRFS_UUID_SIZE) ||
- btrfs_super_nodesize(super_tmp) != state->metablock_size ||
- btrfs_super_sectorsize(super_tmp) != state->datablock_size) {
- ret = 0;
- goto out;
- }
-
- superblock_tmp =
- btrfsic_block_hashtable_lookup(superblock_bdev,
- dev_bytenr,
- &state->block_hashtable);
- if (NULL == superblock_tmp) {
- superblock_tmp = btrfsic_block_alloc();
- if (NULL == superblock_tmp) {
- ret = -1;
- goto out;
- }
- /* for superblock, only the dev_bytenr makes sense */
- superblock_tmp->dev_bytenr = dev_bytenr;
- superblock_tmp->dev_state = dev_state;
- superblock_tmp->logical_bytenr = dev_bytenr;
- superblock_tmp->generation = btrfs_super_generation(super_tmp);
- superblock_tmp->is_metadata = 1;
- superblock_tmp->is_superblock = 1;
- superblock_tmp->is_iodone = 1;
- superblock_tmp->never_written = 0;
- superblock_tmp->mirror_num = 1 + superblock_mirror_num;
- if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE)
- btrfs_info_in_rcu(fs_info,
- "new initial S-block (bdev %p, %s) @%llu (%pg/%llu/%d)",
- superblock_bdev,
- btrfs_dev_name(device), dev_bytenr,
- dev_state->bdev, dev_bytenr,
- superblock_mirror_num);
- list_add(&superblock_tmp->all_blocks_node,
- &state->all_blocks_list);
- btrfsic_block_hashtable_add(superblock_tmp,
- &state->block_hashtable);
- }
-
- /* select the one with the highest generation field */
- if (btrfs_super_generation(super_tmp) >
- state->max_superblock_generation ||
- 0 == state->max_superblock_generation) {
- memcpy(selected_super, super_tmp, sizeof(*selected_super));
- *selected_dev_state = dev_state;
- state->max_superblock_generation =
- btrfs_super_generation(super_tmp);
- state->latest_superblock = superblock_tmp;
- }
-
- for (pass = 0; pass < 3; pass++) {
- u64 next_bytenr;
- int num_copies;
- int mirror_num;
- const char *additional_string = NULL;
- struct btrfs_disk_key tmp_disk_key;
-
- tmp_disk_key.type = BTRFS_ROOT_ITEM_KEY;
- tmp_disk_key.offset = 0;
- switch (pass) {
- case 0:
- btrfs_set_disk_key_objectid(&tmp_disk_key,
- BTRFS_ROOT_TREE_OBJECTID);
- additional_string = "initial root ";
- next_bytenr = btrfs_super_root(super_tmp);
- break;
- case 1:
- btrfs_set_disk_key_objectid(&tmp_disk_key,
- BTRFS_CHUNK_TREE_OBJECTID);
- additional_string = "initial chunk ";
- next_bytenr = btrfs_super_chunk_root(super_tmp);
- break;
- case 2:
- btrfs_set_disk_key_objectid(&tmp_disk_key,
- BTRFS_TREE_LOG_OBJECTID);
- additional_string = "initial log ";
- next_bytenr = btrfs_super_log_root(super_tmp);
- if (0 == next_bytenr)
- continue;
- break;
- }
-
- num_copies = btrfs_num_copies(fs_info, next_bytenr,
- state->metablock_size);
- if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
- pr_info("num_copies(log_bytenr=%llu) = %d\n",
- next_bytenr, num_copies);
- for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
- struct btrfsic_block *next_block;
- struct btrfsic_block_data_ctx tmp_next_block_ctx;
- struct btrfsic_block_link *l;
-
- if (btrfsic_map_block(state, next_bytenr,
- state->metablock_size,
- &tmp_next_block_ctx,
- mirror_num)) {
- pr_info("btrfsic: btrfsic_map_block(bytenr @%llu, mirror %d) failed!\n",
- next_bytenr, mirror_num);
- ret = -1;
- goto out;
- }
-
- next_block = btrfsic_block_lookup_or_add(
- state, &tmp_next_block_ctx,
- additional_string, 1, 1, 0,
- mirror_num, NULL);
- if (NULL == next_block) {
- btrfsic_release_block_ctx(&tmp_next_block_ctx);
- ret = -1;
- goto out;
- }
-
- next_block->disk_key = tmp_disk_key;
- next_block->generation = BTRFSIC_GENERATION_UNKNOWN;
- l = btrfsic_block_link_lookup_or_add(
- state, &tmp_next_block_ctx,
- next_block, superblock_tmp,
- BTRFSIC_GENERATION_UNKNOWN);
- btrfsic_release_block_ctx(&tmp_next_block_ctx);
- if (NULL == l) {
- ret = -1;
- goto out;
- }
- }
- }
- if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_ALL_TREES)
- btrfsic_dump_tree_sub(state, superblock_tmp, 0);
-
-out:
- put_page(page);
- return ret;
-}
-
-static struct btrfsic_stack_frame *btrfsic_stack_frame_alloc(void)
-{
- struct btrfsic_stack_frame *sf;
-
- sf = kzalloc(sizeof(*sf), GFP_NOFS);
- if (sf)
- sf->magic = BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER;
- return sf;
-}
-
-static void btrfsic_stack_frame_free(struct btrfsic_stack_frame *sf)
-{
- BUG_ON(!(NULL == sf ||
- BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER == sf->magic));
- kfree(sf);
-}
-
-static noinline_for_stack int btrfsic_process_metablock(
- struct btrfsic_state *state,
- struct btrfsic_block *const first_block,
- struct btrfsic_block_data_ctx *const first_block_ctx,
- int first_limit_nesting, int force_iodone_flag)
-{
- struct btrfsic_stack_frame initial_stack_frame = { 0 };
- struct btrfsic_stack_frame *sf;
- struct btrfsic_stack_frame *next_stack;
- struct btrfs_header *const first_hdr =
- (struct btrfs_header *)first_block_ctx->datav[0];
-
- BUG_ON(!first_hdr);
- sf = &initial_stack_frame;
- sf->error = 0;
- sf->i = -1;
- sf->limit_nesting = first_limit_nesting;
- sf->block = first_block;
- sf->block_ctx = first_block_ctx;
- sf->next_block = NULL;
- sf->hdr = first_hdr;
- sf->prev = NULL;
-
-continue_with_new_stack_frame:
- sf->block->generation = btrfs_stack_header_generation(sf->hdr);
- if (0 == sf->hdr->level) {
- struct btrfs_leaf *const leafhdr =
- (struct btrfs_leaf *)sf->hdr;
-
- if (-1 == sf->i) {
- sf->nr = btrfs_stack_header_nritems(&leafhdr->header);
-
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
- pr_info("leaf %llu items %d generation %llu owner %llu\n",
- sf->block_ctx->start, sf->nr,
- btrfs_stack_header_generation(
- &leafhdr->header),
- btrfs_stack_header_owner(
- &leafhdr->header));
- }
-
-continue_with_current_leaf_stack_frame:
- if (0 == sf->num_copies || sf->mirror_num > sf->num_copies) {
- sf->i++;
- sf->num_copies = 0;
- }
-
- if (sf->i < sf->nr) {
- struct btrfs_item disk_item;
- u32 disk_item_offset =
- (uintptr_t)(leafhdr->items + sf->i) -
- (uintptr_t)leafhdr;
- struct btrfs_disk_key *disk_key;
- u8 type;
- u32 item_offset;
- u32 item_size;
-
- if (disk_item_offset + sizeof(struct btrfs_item) >
- sf->block_ctx->len) {
-leaf_item_out_of_bounce_error:
- pr_info(
- "btrfsic: leaf item out of bounce at logical %llu, dev %pg\n",
- sf->block_ctx->start,
- sf->block_ctx->dev->bdev);
- goto one_stack_frame_backwards;
- }
- btrfsic_read_from_block_data(sf->block_ctx,
- &disk_item,
- disk_item_offset,
- sizeof(struct btrfs_item));
- item_offset = btrfs_stack_item_offset(&disk_item);
- item_size = btrfs_stack_item_size(&disk_item);
- disk_key = &disk_item.key;
- type = btrfs_disk_key_type(disk_key);
-
- if (BTRFS_ROOT_ITEM_KEY == type) {
- struct btrfs_root_item root_item;
- u32 root_item_offset;
- u64 next_bytenr;
-
- root_item_offset = item_offset +
- offsetof(struct btrfs_leaf, items);
- if (root_item_offset + item_size >
- sf->block_ctx->len)
- goto leaf_item_out_of_bounce_error;
- btrfsic_read_from_block_data(
- sf->block_ctx, &root_item,
- root_item_offset,
- item_size);
- next_bytenr = btrfs_root_bytenr(&root_item);
-
- sf->error =
- btrfsic_create_link_to_next_block(
- state,
- sf->block,
- sf->block_ctx,
- next_bytenr,
- sf->limit_nesting,
- &sf->next_block_ctx,
- &sf->next_block,
- force_iodone_flag,
- &sf->num_copies,
- &sf->mirror_num,
- disk_key,
- btrfs_root_generation(
- &root_item));
- if (sf->error)
- goto one_stack_frame_backwards;
-
- if (NULL != sf->next_block) {
- struct btrfs_header *const next_hdr =
- (struct btrfs_header *)
- sf->next_block_ctx.datav[0];
-
- next_stack =
- btrfsic_stack_frame_alloc();
- if (NULL == next_stack) {
- sf->error = -1;
- btrfsic_release_block_ctx(
- &sf->
- next_block_ctx);
- goto one_stack_frame_backwards;
- }
-
- next_stack->i = -1;
- next_stack->block = sf->next_block;
- next_stack->block_ctx =
- &sf->next_block_ctx;
- next_stack->next_block = NULL;
- next_stack->hdr = next_hdr;
- next_stack->limit_nesting =
- sf->limit_nesting - 1;
- next_stack->prev = sf;
- sf = next_stack;
- goto continue_with_new_stack_frame;
- }
- } else if (BTRFS_EXTENT_DATA_KEY == type &&
- state->include_extent_data) {
- sf->error = btrfsic_handle_extent_data(
- state,
- sf->block,
- sf->block_ctx,
- item_offset,
- force_iodone_flag);
- if (sf->error)
- goto one_stack_frame_backwards;
- }
-
- goto continue_with_current_leaf_stack_frame;
- }
- } else {
- struct btrfs_node *const nodehdr = (struct btrfs_node *)sf->hdr;
-
- if (-1 == sf->i) {
- sf->nr = btrfs_stack_header_nritems(&nodehdr->header);
-
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
- pr_info("node %llu level %d items %d generation %llu owner %llu\n",
- sf->block_ctx->start,
- nodehdr->header.level, sf->nr,
- btrfs_stack_header_generation(
- &nodehdr->header),
- btrfs_stack_header_owner(
- &nodehdr->header));
- }
-
-continue_with_current_node_stack_frame:
- if (0 == sf->num_copies || sf->mirror_num > sf->num_copies) {
- sf->i++;
- sf->num_copies = 0;
- }
-
- if (sf->i < sf->nr) {
- struct btrfs_key_ptr key_ptr;
- u32 key_ptr_offset;
- u64 next_bytenr;
-
- key_ptr_offset = (uintptr_t)(nodehdr->ptrs + sf->i) -
- (uintptr_t)nodehdr;
- if (key_ptr_offset + sizeof(struct btrfs_key_ptr) >
- sf->block_ctx->len) {
- pr_info(
- "btrfsic: node item out of bounce at logical %llu, dev %pg\n",
- sf->block_ctx->start,
- sf->block_ctx->dev->bdev);
- goto one_stack_frame_backwards;
- }
- btrfsic_read_from_block_data(
- sf->block_ctx, &key_ptr, key_ptr_offset,
- sizeof(struct btrfs_key_ptr));
- next_bytenr = btrfs_stack_key_blockptr(&key_ptr);
-
- sf->error = btrfsic_create_link_to_next_block(
- state,
- sf->block,
- sf->block_ctx,
- next_bytenr,
- sf->limit_nesting,
- &sf->next_block_ctx,
- &sf->next_block,
- force_iodone_flag,
- &sf->num_copies,
- &sf->mirror_num,
- &key_ptr.key,
- btrfs_stack_key_generation(&key_ptr));
- if (sf->error)
- goto one_stack_frame_backwards;
-
- if (NULL != sf->next_block) {
- struct btrfs_header *const next_hdr =
- (struct btrfs_header *)
- sf->next_block_ctx.datav[0];
-
- next_stack = btrfsic_stack_frame_alloc();
- if (NULL == next_stack) {
- sf->error = -1;
- goto one_stack_frame_backwards;
- }
-
- next_stack->i = -1;
- next_stack->block = sf->next_block;
- next_stack->block_ctx = &sf->next_block_ctx;
- next_stack->next_block = NULL;
- next_stack->hdr = next_hdr;
- next_stack->limit_nesting =
- sf->limit_nesting - 1;
- next_stack->prev = sf;
- sf = next_stack;
- goto continue_with_new_stack_frame;
- }
-
- goto continue_with_current_node_stack_frame;
- }
- }
-
-one_stack_frame_backwards:
- if (NULL != sf->prev) {
- struct btrfsic_stack_frame *const prev = sf->prev;
-
- /* the one for the initial block is freed in the caller */
- btrfsic_release_block_ctx(sf->block_ctx);
-
- if (sf->error) {
- prev->error = sf->error;
- btrfsic_stack_frame_free(sf);
- sf = prev;
- goto one_stack_frame_backwards;
- }
-
- btrfsic_stack_frame_free(sf);
- sf = prev;
- goto continue_with_new_stack_frame;
- } else {
- BUG_ON(&initial_stack_frame != sf);
- }
-
- return sf->error;
-}
-
-static void btrfsic_read_from_block_data(
- struct btrfsic_block_data_ctx *block_ctx,
- void *dstv, u32 offset, size_t len)
-{
- size_t cur;
- size_t pgoff;
- char *kaddr;
- char *dst = (char *)dstv;
- size_t start_offset = offset_in_page(block_ctx->start);
- unsigned long i = (start_offset + offset) >> PAGE_SHIFT;
-
- WARN_ON(offset + len > block_ctx->len);
- pgoff = offset_in_page(start_offset + offset);
-
- while (len > 0) {
- cur = min(len, ((size_t)PAGE_SIZE - pgoff));
- BUG_ON(i >= DIV_ROUND_UP(block_ctx->len, PAGE_SIZE));
- kaddr = block_ctx->datav[i];
- memcpy(dst, kaddr + pgoff, cur);
-
- dst += cur;
- len -= cur;
- pgoff = 0;
- i++;
- }
-}
-
-static int btrfsic_create_link_to_next_block(
- struct btrfsic_state *state,
- struct btrfsic_block *block,
- struct btrfsic_block_data_ctx *block_ctx,
- u64 next_bytenr,
- int limit_nesting,
- struct btrfsic_block_data_ctx *next_block_ctx,
- struct btrfsic_block **next_blockp,
- int force_iodone_flag,
- int *num_copiesp, int *mirror_nump,
- struct btrfs_disk_key *disk_key,
- u64 parent_generation)
-{
- struct btrfs_fs_info *fs_info = state->fs_info;
- struct btrfsic_block *next_block = NULL;
- int ret;
- struct btrfsic_block_link *l;
- int did_alloc_block_link;
- int block_was_created;
-
- *next_blockp = NULL;
- if (0 == *num_copiesp) {
- *num_copiesp = btrfs_num_copies(fs_info, next_bytenr,
- state->metablock_size);
- if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
- pr_info("num_copies(log_bytenr=%llu) = %d\n",
- next_bytenr, *num_copiesp);
- *mirror_nump = 1;
- }
-
- if (*mirror_nump > *num_copiesp)
- return 0;
-
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
- pr_info("btrfsic_create_link_to_next_block(mirror_num=%d)\n",
- *mirror_nump);
- ret = btrfsic_map_block(state, next_bytenr,
- state->metablock_size,
- next_block_ctx, *mirror_nump);
- if (ret) {
- pr_info("btrfsic: btrfsic_map_block(@%llu, mirror=%d) failed!\n",
- next_bytenr, *mirror_nump);
- btrfsic_release_block_ctx(next_block_ctx);
- *next_blockp = NULL;
- return -1;
- }
-
- next_block = btrfsic_block_lookup_or_add(state,
- next_block_ctx, "referenced ",
- 1, force_iodone_flag,
- !force_iodone_flag,
- *mirror_nump,
- &block_was_created);
- if (NULL == next_block) {
- btrfsic_release_block_ctx(next_block_ctx);
- *next_blockp = NULL;
- return -1;
- }
- if (block_was_created) {
- l = NULL;
- next_block->generation = BTRFSIC_GENERATION_UNKNOWN;
- } else {
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE) {
- if (next_block->logical_bytenr != next_bytenr &&
- !(!next_block->is_metadata &&
- 0 == next_block->logical_bytenr))
- pr_info(
-"referenced block @%llu (%pg/%llu/%d) found in hash table, %c, bytenr mismatch (!= stored %llu)\n",
- next_bytenr, next_block_ctx->dev->bdev,
- next_block_ctx->dev_bytenr, *mirror_nump,
- btrfsic_get_block_type(state,
- next_block),
- next_block->logical_bytenr);
- else
- pr_info(
- "referenced block @%llu (%pg/%llu/%d) found in hash table, %c\n",
- next_bytenr, next_block_ctx->dev->bdev,
- next_block_ctx->dev_bytenr, *mirror_nump,
- btrfsic_get_block_type(state,
- next_block));
- }
- next_block->logical_bytenr = next_bytenr;
-
- next_block->mirror_num = *mirror_nump;
- l = btrfsic_block_link_hashtable_lookup(
- next_block_ctx->dev->bdev,
- next_block_ctx->dev_bytenr,
- block_ctx->dev->bdev,
- block_ctx->dev_bytenr,
- &state->block_link_hashtable);
- }
-
- next_block->disk_key = *disk_key;
- if (NULL == l) {
- l = btrfsic_block_link_alloc();
- if (NULL == l) {
- btrfsic_release_block_ctx(next_block_ctx);
- *next_blockp = NULL;
- return -1;
- }
-
- did_alloc_block_link = 1;
- l->block_ref_to = next_block;
- l->block_ref_from = block;
- l->ref_cnt = 1;
- l->parent_generation = parent_generation;
-
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
- btrfsic_print_add_link(state, l);
-
- list_add(&l->node_ref_to, &block->ref_to_list);
- list_add(&l->node_ref_from, &next_block->ref_from_list);
-
- btrfsic_block_link_hashtable_add(l,
- &state->block_link_hashtable);
- } else {
- did_alloc_block_link = 0;
- if (0 == limit_nesting) {
- l->ref_cnt++;
- l->parent_generation = parent_generation;
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
- btrfsic_print_add_link(state, l);
- }
- }
-
- if (limit_nesting > 0 && did_alloc_block_link) {
- ret = btrfsic_read_block(state, next_block_ctx);
- if (ret < (int)next_block_ctx->len) {
- pr_info("btrfsic: read block @logical %llu failed!\n",
- next_bytenr);
- btrfsic_release_block_ctx(next_block_ctx);
- *next_blockp = NULL;
- return -1;
- }
-
- *next_blockp = next_block;
- } else {
- *next_blockp = NULL;
- }
- (*mirror_nump)++;
-
- return 0;
-}
-
-static int btrfsic_handle_extent_data(
- struct btrfsic_state *state,
- struct btrfsic_block *block,
- struct btrfsic_block_data_ctx *block_ctx,
- u32 item_offset, int force_iodone_flag)
-{
- struct btrfs_fs_info *fs_info = state->fs_info;
- struct btrfs_file_extent_item file_extent_item;
- u64 file_extent_item_offset;
- u64 next_bytenr;
- u64 num_bytes;
- u64 generation;
- struct btrfsic_block_link *l;
- int ret;
-
- file_extent_item_offset = offsetof(struct btrfs_leaf, items) +
- item_offset;
- if (file_extent_item_offset +
- offsetof(struct btrfs_file_extent_item, disk_num_bytes) >
- block_ctx->len) {
- pr_info("btrfsic: file item out of bounce at logical %llu, dev %pg\n",
- block_ctx->start, block_ctx->dev->bdev);
- return -1;
- }
-
- btrfsic_read_from_block_data(block_ctx, &file_extent_item,
- file_extent_item_offset,
- offsetof(struct btrfs_file_extent_item, disk_num_bytes));
- if (BTRFS_FILE_EXTENT_REG != file_extent_item.type ||
- btrfs_stack_file_extent_disk_bytenr(&file_extent_item) == 0) {
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE)
- pr_info("extent_data: type %u, disk_bytenr = %llu\n",
- file_extent_item.type,
- btrfs_stack_file_extent_disk_bytenr(
- &file_extent_item));
- return 0;
- }
-
- if (file_extent_item_offset + sizeof(struct btrfs_file_extent_item) >
- block_ctx->len) {
- pr_info("btrfsic: file item out of bounce at logical %llu, dev %pg\n",
- block_ctx->start, block_ctx->dev->bdev);
- return -1;
- }
- btrfsic_read_from_block_data(block_ctx, &file_extent_item,
- file_extent_item_offset,
- sizeof(struct btrfs_file_extent_item));
- next_bytenr = btrfs_stack_file_extent_disk_bytenr(&file_extent_item);
- if (btrfs_stack_file_extent_compression(&file_extent_item) ==
- BTRFS_COMPRESS_NONE) {
- next_bytenr += btrfs_stack_file_extent_offset(&file_extent_item);
- num_bytes = btrfs_stack_file_extent_num_bytes(&file_extent_item);
- } else {
- num_bytes = btrfs_stack_file_extent_disk_num_bytes(&file_extent_item);
- }
- generation = btrfs_stack_file_extent_generation(&file_extent_item);
-
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE)
- pr_info("extent_data: type %u, disk_bytenr = %llu, offset = %llu, num_bytes = %llu\n",
- file_extent_item.type,
- btrfs_stack_file_extent_disk_bytenr(&file_extent_item),
- btrfs_stack_file_extent_offset(&file_extent_item),
- num_bytes);
- while (num_bytes > 0) {
- u32 chunk_len;
- int num_copies;
- int mirror_num;
-
- if (num_bytes > state->datablock_size)
- chunk_len = state->datablock_size;
- else
- chunk_len = num_bytes;
-
- num_copies = btrfs_num_copies(fs_info, next_bytenr,
- state->datablock_size);
- if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
- pr_info("num_copies(log_bytenr=%llu) = %d\n",
- next_bytenr, num_copies);
- for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
- struct btrfsic_block_data_ctx next_block_ctx;
- struct btrfsic_block *next_block;
- int block_was_created;
-
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
- pr_info("btrfsic_handle_extent_data(mirror_num=%d)\n",
- mirror_num);
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE)
- pr_info("\tdisk_bytenr = %llu, num_bytes %u\n",
- next_bytenr, chunk_len);
- ret = btrfsic_map_block(state, next_bytenr,
- chunk_len, &next_block_ctx,
- mirror_num);
- if (ret) {
- pr_info("btrfsic: btrfsic_map_block(@%llu, mirror=%d) failed!\n",
- next_bytenr, mirror_num);
- return -1;
- }
-
- next_block = btrfsic_block_lookup_or_add(
- state,
- &next_block_ctx,
- "referenced ",
- 0,
- force_iodone_flag,
- !force_iodone_flag,
- mirror_num,
- &block_was_created);
- if (NULL == next_block) {
- btrfsic_release_block_ctx(&next_block_ctx);
- return -1;
- }
- if (!block_was_created) {
- if ((state->print_mask &
- BTRFSIC_PRINT_MASK_VERBOSE) &&
- next_block->logical_bytenr != next_bytenr &&
- !(!next_block->is_metadata &&
- 0 == next_block->logical_bytenr)) {
- pr_info(
-"referenced block @%llu (%pg/%llu/%d) found in hash table, D, bytenr mismatch (!= stored %llu)\n",
- next_bytenr,
- next_block_ctx.dev->bdev,
- next_block_ctx.dev_bytenr,
- mirror_num,
- next_block->logical_bytenr);
- }
- next_block->logical_bytenr = next_bytenr;
- next_block->mirror_num = mirror_num;
- }
-
- l = btrfsic_block_link_lookup_or_add(state,
- &next_block_ctx,
- next_block, block,
- generation);
- btrfsic_release_block_ctx(&next_block_ctx);
- if (NULL == l)
- return -1;
- }
-
- next_bytenr += chunk_len;
- num_bytes -= chunk_len;
- }
-
- return 0;
-}
-
-static int btrfsic_map_block(struct btrfsic_state *state, u64 bytenr, u32 len,
- struct btrfsic_block_data_ctx *block_ctx_out,
- int mirror_num)
-{
- struct btrfs_fs_info *fs_info = state->fs_info;
- int ret;
- u64 length;
- struct btrfs_io_context *bioc = NULL;
- struct btrfs_io_stripe smap, *map;
- struct btrfs_device *device;
-
- length = len;
- ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, bytenr, &length, &bioc,
- NULL, &mirror_num, 0);
- if (ret) {
- block_ctx_out->start = 0;
- block_ctx_out->dev_bytenr = 0;
- block_ctx_out->len = 0;
- block_ctx_out->dev = NULL;
- block_ctx_out->datav = NULL;
- block_ctx_out->pagev = NULL;
- block_ctx_out->mem_to_free = NULL;
-
- return ret;
- }
-
- if (bioc)
- map = &bioc->stripes[0];
- else
- map = &smap;
-
- device = map->dev;
- if (test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state) ||
- !device->bdev || !device->name)
- block_ctx_out->dev = NULL;
- else
- block_ctx_out->dev = btrfsic_dev_state_lookup(
- device->bdev->bd_dev);
- block_ctx_out->dev_bytenr = map->physical;
- block_ctx_out->start = bytenr;
- block_ctx_out->len = len;
- block_ctx_out->datav = NULL;
- block_ctx_out->pagev = NULL;
- block_ctx_out->mem_to_free = NULL;
-
- kfree(bioc);
- if (NULL == block_ctx_out->dev) {
- ret = -ENXIO;
- pr_info("btrfsic: error, cannot lookup dev (#1)!\n");
- }
-
- return ret;
-}
-
-static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx)
-{
- if (block_ctx->mem_to_free) {
- unsigned int num_pages;
-
- BUG_ON(!block_ctx->datav);
- BUG_ON(!block_ctx->pagev);
- num_pages = (block_ctx->len + (u64)PAGE_SIZE - 1) >>
- PAGE_SHIFT;
- /* Pages must be unmapped in reverse order */
- while (num_pages > 0) {
- num_pages--;
- if (block_ctx->datav[num_pages])
- block_ctx->datav[num_pages] = NULL;
- if (block_ctx->pagev[num_pages]) {
- __free_page(block_ctx->pagev[num_pages]);
- block_ctx->pagev[num_pages] = NULL;
- }
- }
-
- kfree(block_ctx->mem_to_free);
- block_ctx->mem_to_free = NULL;
- block_ctx->pagev = NULL;
- block_ctx->datav = NULL;
- }
-}
-
-static int btrfsic_read_block(struct btrfsic_state *state,
- struct btrfsic_block_data_ctx *block_ctx)
-{
- unsigned int num_pages;
- unsigned int i;
- size_t size;
- u64 dev_bytenr;
- int ret;
-
- BUG_ON(block_ctx->datav);
- BUG_ON(block_ctx->pagev);
- BUG_ON(block_ctx->mem_to_free);
- if (!PAGE_ALIGNED(block_ctx->dev_bytenr)) {
- pr_info("btrfsic: read_block() with unaligned bytenr %llu\n",
- block_ctx->dev_bytenr);
- return -1;
- }
-
- num_pages = (block_ctx->len + (u64)PAGE_SIZE - 1) >>
- PAGE_SHIFT;
- size = sizeof(*block_ctx->datav) + sizeof(*block_ctx->pagev);
- block_ctx->mem_to_free = kcalloc(num_pages, size, GFP_NOFS);
- if (!block_ctx->mem_to_free)
- return -ENOMEM;
- block_ctx->datav = block_ctx->mem_to_free;
- block_ctx->pagev = (struct page **)(block_ctx->datav + num_pages);
- ret = btrfs_alloc_page_array(num_pages, block_ctx->pagev);
- if (ret)
- return ret;
-
- dev_bytenr = block_ctx->dev_bytenr;
- for (i = 0; i < num_pages;) {
- struct bio *bio;
- unsigned int j;
-
- bio = bio_alloc(block_ctx->dev->bdev, num_pages - i,
- REQ_OP_READ, GFP_NOFS);
- bio->bi_iter.bi_sector = dev_bytenr >> SECTOR_SHIFT;
-
- for (j = i; j < num_pages; j++) {
- ret = bio_add_page(bio, block_ctx->pagev[j],
- PAGE_SIZE, 0);
- if (PAGE_SIZE != ret)
- break;
- }
- if (j == i) {
- pr_info("btrfsic: error, failed to add a single page!\n");
- return -1;
- }
- if (submit_bio_wait(bio)) {
- pr_info("btrfsic: read error at logical %llu dev %pg!\n",
- block_ctx->start, block_ctx->dev->bdev);
- bio_put(bio);
- return -1;
- }
- bio_put(bio);
- dev_bytenr += (j - i) * PAGE_SIZE;
- i = j;
- }
- for (i = 0; i < num_pages; i++)
- block_ctx->datav[i] = page_address(block_ctx->pagev[i]);
-
- return block_ctx->len;
-}
-
-static void btrfsic_dump_database(struct btrfsic_state *state)
-{
- const struct btrfsic_block *b_all;
-
- BUG_ON(NULL == state);
-
- pr_info("all_blocks_list:\n");
- list_for_each_entry(b_all, &state->all_blocks_list, all_blocks_node) {
- const struct btrfsic_block_link *l;
-
- pr_info("%c-block @%llu (%pg/%llu/%d)\n",
- btrfsic_get_block_type(state, b_all),
- b_all->logical_bytenr, b_all->dev_state->bdev,
- b_all->dev_bytenr, b_all->mirror_num);
-
- list_for_each_entry(l, &b_all->ref_to_list, node_ref_to) {
- pr_info(
- " %c @%llu (%pg/%llu/%d) refers %u* to %c @%llu (%pg/%llu/%d)\n",
- btrfsic_get_block_type(state, b_all),
- b_all->logical_bytenr, b_all->dev_state->bdev,
- b_all->dev_bytenr, b_all->mirror_num,
- l->ref_cnt,
- btrfsic_get_block_type(state, l->block_ref_to),
- l->block_ref_to->logical_bytenr,
- l->block_ref_to->dev_state->bdev,
- l->block_ref_to->dev_bytenr,
- l->block_ref_to->mirror_num);
- }
-
- list_for_each_entry(l, &b_all->ref_from_list, node_ref_from) {
- pr_info(
- " %c @%llu (%pg/%llu/%d) is ref %u* from %c @%llu (%pg/%llu/%d)\n",
- btrfsic_get_block_type(state, b_all),
- b_all->logical_bytenr, b_all->dev_state->bdev,
- b_all->dev_bytenr, b_all->mirror_num,
- l->ref_cnt,
- btrfsic_get_block_type(state, l->block_ref_from),
- l->block_ref_from->logical_bytenr,
- l->block_ref_from->dev_state->bdev,
- l->block_ref_from->dev_bytenr,
- l->block_ref_from->mirror_num);
- }
-
- pr_info("\n");
- }
-}
-
-static void btrfsic_print_add_link(const struct btrfsic_state *state,
- const struct btrfsic_block_link *l)
-{
- pr_info("add %u* link from %c @%llu (%pg/%llu/%d) to %c @%llu (%pg/%llu/%d)\n",
- l->ref_cnt,
- btrfsic_get_block_type(state, l->block_ref_from),
- l->block_ref_from->logical_bytenr,
- l->block_ref_from->dev_state->bdev,
- l->block_ref_from->dev_bytenr, l->block_ref_from->mirror_num,
- btrfsic_get_block_type(state, l->block_ref_to),
- l->block_ref_to->logical_bytenr,
- l->block_ref_to->dev_state->bdev, l->block_ref_to->dev_bytenr,
- l->block_ref_to->mirror_num);
-}
-
static void btrfsic_print_rem_link(const struct btrfsic_state *state,
const struct btrfsic_block_link *l)
{
return 'D';
}
-static void btrfsic_dump_tree(const struct btrfsic_state *state)
-{
- btrfsic_dump_tree_sub(state, state->latest_superblock, 0);
-}
-
-static void btrfsic_dump_tree_sub(const struct btrfsic_state *state,
- const struct btrfsic_block *block,
- int indent_level)
-{
- const struct btrfsic_block_link *l;
- int indent_add;
- static char buf[80];
- int cursor_position;
-
- /*
- * Should better fill an on-stack buffer with a complete line and
- * dump it at once when it is time to print a newline character.
- */
-
- /*
- * This algorithm is recursive because the amount of used stack space
- * is very small and the max recursion depth is limited.
- */
- indent_add = sprintf(buf, "%c-%llu(%pg/%llu/%u)",
- btrfsic_get_block_type(state, block),
- block->logical_bytenr, block->dev_state->bdev,
- block->dev_bytenr, block->mirror_num);
- if (indent_level + indent_add > BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL) {
- printk("[...]\n");
- return;
- }
- printk(buf);
- indent_level += indent_add;
- if (list_empty(&block->ref_to_list)) {
- printk("\n");
- return;
- }
- if (block->mirror_num > 1 &&
- !(state->print_mask & BTRFSIC_PRINT_MASK_TREE_WITH_ALL_MIRRORS)) {
- printk(" [...]\n");
- return;
- }
-
- cursor_position = indent_level;
- list_for_each_entry(l, &block->ref_to_list, node_ref_to) {
- while (cursor_position < indent_level) {
- printk(" ");
- cursor_position++;
- }
- if (l->ref_cnt > 1)
- indent_add = sprintf(buf, " %d*--> ", l->ref_cnt);
- else
- indent_add = sprintf(buf, " --> ");
- if (indent_level + indent_add >
- BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL) {
- printk("[...]\n");
- cursor_position = 0;
- continue;
- }
-
- printk(buf);
-
- btrfsic_dump_tree_sub(state, l->block_ref_to,
- indent_level + indent_add);
- cursor_position = 0;
- }
-}
-
-static struct btrfsic_block_link *btrfsic_block_link_lookup_or_add(
- struct btrfsic_state *state,
- struct btrfsic_block_data_ctx *next_block_ctx,
- struct btrfsic_block *next_block,
- struct btrfsic_block *from_block,
- u64 parent_generation)
-{
- struct btrfsic_block_link *l;
-
- l = btrfsic_block_link_hashtable_lookup(next_block_ctx->dev->bdev,
- next_block_ctx->dev_bytenr,
- from_block->dev_state->bdev,
- from_block->dev_bytenr,
- &state->block_link_hashtable);
- if (NULL == l) {
- l = btrfsic_block_link_alloc();
- if (!l)
- return NULL;
-
- l->block_ref_to = next_block;
- l->block_ref_from = from_block;
- l->ref_cnt = 1;
- l->parent_generation = parent_generation;
-
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
- btrfsic_print_add_link(state, l);
-
- list_add(&l->node_ref_to, &from_block->ref_to_list);
- list_add(&l->node_ref_from, &next_block->ref_from_list);
-
- btrfsic_block_link_hashtable_add(l,
- &state->block_link_hashtable);
- } else {
- l->ref_cnt++;
- l->parent_generation = parent_generation;
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
- btrfsic_print_add_link(state, l);
- }
-
- return l;
-}
-
-static struct btrfsic_block *btrfsic_block_lookup_or_add(
- struct btrfsic_state *state,
- struct btrfsic_block_data_ctx *block_ctx,
- const char *additional_string,
- int is_metadata,
- int is_iodone,
- int never_written,
- int mirror_num,
- int *was_created)
-{
- struct btrfsic_block *block;
-
- block = btrfsic_block_hashtable_lookup(block_ctx->dev->bdev,
- block_ctx->dev_bytenr,
- &state->block_hashtable);
- if (NULL == block) {
- struct btrfsic_dev_state *dev_state;
-
- block = btrfsic_block_alloc();
- if (!block)
- return NULL;
-
- dev_state = btrfsic_dev_state_lookup(block_ctx->dev->bdev->bd_dev);
- if (NULL == dev_state) {
- pr_info("btrfsic: error, lookup dev_state failed!\n");
- btrfsic_block_free(block);
- return NULL;
- }
- block->dev_state = dev_state;
- block->dev_bytenr = block_ctx->dev_bytenr;
- block->logical_bytenr = block_ctx->start;
- block->is_metadata = is_metadata;
- block->is_iodone = is_iodone;
- block->never_written = never_written;
- block->mirror_num = mirror_num;
- if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
- pr_info("New %s%c-block @%llu (%pg/%llu/%d)\n",
- additional_string,
- btrfsic_get_block_type(state, block),
- block->logical_bytenr, dev_state->bdev,
- block->dev_bytenr, mirror_num);
- list_add(&block->all_blocks_node, &state->all_blocks_list);
- btrfsic_block_hashtable_add(block, &state->block_hashtable);
- if (NULL != was_created)
- *was_created = 1;
- } else {
- if (NULL != was_created)
- *was_created = 0;
- }
-
- return block;
-}
-
-static struct btrfsic_dev_state *btrfsic_dev_state_lookup(dev_t dev)
-{
- return btrfsic_dev_state_hashtable_lookup(dev,
- &btrfsic_dev_state_hashtable);
-}
-
-int btrfsic_mount(struct btrfs_fs_info *fs_info,
- struct btrfs_fs_devices *fs_devices,
- int including_extent_data, u32 print_mask)
-{
- int ret;
- struct btrfsic_state *state;
- struct list_head *dev_head = &fs_devices->devices;
- struct btrfs_device *device;
-
- if (!PAGE_ALIGNED(fs_info->nodesize)) {
- pr_info("btrfsic: cannot handle nodesize %d not being a multiple of PAGE_SIZE %ld!\n",
- fs_info->nodesize, PAGE_SIZE);
- return -1;
- }
- if (!PAGE_ALIGNED(fs_info->sectorsize)) {
- pr_info("btrfsic: cannot handle sectorsize %d not being a multiple of PAGE_SIZE %ld!\n",
- fs_info->sectorsize, PAGE_SIZE);
- return -1;
- }
- state = kvzalloc(sizeof(*state), GFP_KERNEL);
- if (!state)
- return -ENOMEM;
-
- if (!btrfsic_is_initialized) {
- mutex_init(&btrfsic_mutex);
- btrfsic_dev_state_hashtable_init(&btrfsic_dev_state_hashtable);
- btrfsic_is_initialized = 1;
- }
- mutex_lock(&btrfsic_mutex);
- state->fs_info = fs_info;
- state->print_mask = print_mask;
- state->include_extent_data = including_extent_data;
- state->metablock_size = fs_info->nodesize;
- state->datablock_size = fs_info->sectorsize;
- INIT_LIST_HEAD(&state->all_blocks_list);
- btrfsic_block_hashtable_init(&state->block_hashtable);
- btrfsic_block_link_hashtable_init(&state->block_link_hashtable);
- state->max_superblock_generation = 0;
- state->latest_superblock = NULL;
-
- list_for_each_entry(device, dev_head, dev_list) {
- struct btrfsic_dev_state *ds;
-
- if (!device->bdev || !device->name)
- continue;
-
- ds = btrfsic_dev_state_alloc();
- if (NULL == ds) {
- mutex_unlock(&btrfsic_mutex);
- return -ENOMEM;
- }
- ds->bdev = device->bdev;
- ds->state = state;
- btrfsic_dev_state_hashtable_add(ds,
- &btrfsic_dev_state_hashtable);
- }
-
- ret = btrfsic_process_superblock(state, fs_devices);
- if (0 != ret) {
- mutex_unlock(&btrfsic_mutex);
- btrfsic_unmount(fs_devices);
- return ret;
- }
-
- if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_DATABASE)
- btrfsic_dump_database(state);
- if (state->print_mask & BTRFSIC_PRINT_MASK_INITIAL_TREE)
- btrfsic_dump_tree(state);
-
- mutex_unlock(&btrfsic_mutex);
- return 0;
-}
-
void btrfsic_unmount(struct btrfs_fs_devices *fs_devices)
{
struct btrfsic_block *b_all, *tmp_all;
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