From 592d92eeab3770b2525d2fc5589b205c9f8c33e3 Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Tue, 14 Mar 2017 13:33:55 -0700 Subject: [PATCH] Btrfs: create a helper for getting chunk map We have similar code here and there, this merges them into a helper. Signed-off-by: Liu Bo Reviewed-by: Qu Wenruo Signed-off-by: David Sterba --- fs/btrfs/extent_io.c | 3 +- fs/btrfs/volumes.c | 163 +++++++++++++++---------------------------- fs/btrfs/volumes.h | 2 +- 3 files changed, 57 insertions(+), 111 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 174ffffd6d97..77bd016ba18b 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2004,14 +2004,13 @@ int repair_io_failure(struct btrfs_inode *inode, u64 start, u64 length, u64 map_length = 0; u64 sector; struct btrfs_bio *bbio = NULL; - struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; int ret; ASSERT(!(fs_info->sb->s_flags & MS_RDONLY)); BUG_ON(!mirror_num); /* we can't repair anything in raid56 yet */ - if (btrfs_is_parity_mirror(map_tree, logical, length, mirror_num)) + if (btrfs_is_parity_mirror(fs_info, logical, length, mirror_num)) return 0; bio = btrfs_io_bio_alloc(GFP_NOFS, 1); diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index dce59fb59b0c..122201897bee 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2795,10 +2795,38 @@ static int btrfs_del_sys_chunk(struct btrfs_fs_info *fs_info, return ret; } +static struct extent_map *get_chunk_map(struct btrfs_fs_info *fs_info, + u64 logical, u64 length) +{ + struct extent_map_tree *em_tree; + struct extent_map *em; + + em_tree = &fs_info->mapping_tree.map_tree; + read_lock(&em_tree->lock); + em = lookup_extent_mapping(em_tree, logical, length); + read_unlock(&em_tree->lock); + + if (!em) { + btrfs_crit(fs_info, "unable to find logical %llu length %llu", + logical, length); + return ERR_PTR(-EINVAL); + } + + if (em->start > logical || em->start + em->len < logical) { + btrfs_crit(fs_info, + "found a bad mapping, wanted %llu-%llu, found %llu-%llu", + logical, length, em->start, em->start + em->len); + free_extent_map(em); + return ERR_PTR(-EINVAL); + } + + /* callers are responsible for dropping em's ref. */ + return em; +} + int btrfs_remove_chunk(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info, u64 chunk_offset) { - struct extent_map_tree *em_tree; struct extent_map *em; struct map_lookup *map; u64 dev_extent_len = 0; @@ -2806,23 +2834,15 @@ int btrfs_remove_chunk(struct btrfs_trans_handle *trans, int i, ret = 0; struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; - em_tree = &fs_info->mapping_tree.map_tree; - - read_lock(&em_tree->lock); - em = lookup_extent_mapping(em_tree, chunk_offset, 1); - read_unlock(&em_tree->lock); - - if (!em || em->start > chunk_offset || - em->start + em->len < chunk_offset) { + em = get_chunk_map(fs_info, chunk_offset, 1); + if (IS_ERR(em)) { /* * This is a logic error, but we don't want to just rely on the * user having built with ASSERT enabled, so if ASSERT doesn't * do anything we still error out. */ ASSERT(0); - if (em) - free_extent_map(em); - return -EINVAL; + return PTR_ERR(em); } map = em->map_lookup; mutex_lock(&fs_info->chunk_mutex); @@ -4894,7 +4914,6 @@ int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, struct btrfs_device *device; struct btrfs_chunk *chunk; struct btrfs_stripe *stripe; - struct extent_map_tree *em_tree; struct extent_map *em; struct map_lookup *map; size_t item_size; @@ -4903,24 +4922,9 @@ int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, int i = 0; int ret = 0; - em_tree = &fs_info->mapping_tree.map_tree; - read_lock(&em_tree->lock); - em = lookup_extent_mapping(em_tree, chunk_offset, chunk_size); - read_unlock(&em_tree->lock); - - if (!em) { - btrfs_crit(fs_info, "unable to find logical %Lu len %Lu", - chunk_offset, chunk_size); - return -EINVAL; - } - - if (em->start != chunk_offset || em->len != chunk_size) { - btrfs_crit(fs_info, - "found a bad mapping, wanted %Lu-%Lu, found %Lu-%Lu", - chunk_offset, chunk_size, em->start, em->len); - free_extent_map(em); - return -EINVAL; - } + em = get_chunk_map(fs_info, chunk_offset, chunk_size); + if (IS_ERR(em)) + return PTR_ERR(em); map = em->map_lookup; item_size = btrfs_chunk_item_size(map->num_stripes); @@ -5061,15 +5065,12 @@ int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset) { struct extent_map *em; struct map_lookup *map; - struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; int readonly = 0; int miss_ndevs = 0; int i; - read_lock(&map_tree->map_tree.lock); - em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); - read_unlock(&map_tree->map_tree.lock); - if (!em) + em = get_chunk_map(fs_info, chunk_offset, 1); + if (IS_ERR(em)) return 1; map = em->map_lookup; @@ -5123,34 +5124,19 @@ void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len) { - struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; struct extent_map *em; struct map_lookup *map; - struct extent_map_tree *em_tree = &map_tree->map_tree; int ret; - read_lock(&em_tree->lock); - em = lookup_extent_mapping(em_tree, logical, len); - read_unlock(&em_tree->lock); - - /* - * We could return errors for these cases, but that could get ugly and - * we'd probably do the same thing which is just not do anything else - * and exit, so return 1 so the callers don't try to use other copies. - */ - if (!em) { - btrfs_crit(fs_info, "No mapping for %Lu-%Lu", logical, - logical+len); + em = get_chunk_map(fs_info, logical, len); + if (IS_ERR(em)) + /* + * We could return errors for these cases, but that could get + * ugly and we'd probably do the same thing which is just not do + * anything else and exit, so return 1 so the callers don't try + * to use other copies. + */ return 1; - } - - if (em->start > logical || em->start + em->len < logical) { - btrfs_crit(fs_info, "Invalid mapping for %Lu-%Lu, got %Lu-%Lu", - logical, logical+len, em->start, - em->start + em->len); - free_extent_map(em); - return 1; - } map = em->map_lookup; if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) @@ -5179,15 +5165,11 @@ unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info, { struct extent_map *em; struct map_lookup *map; - struct extent_map_tree *em_tree = &map_tree->map_tree; unsigned long len = fs_info->sectorsize; - read_lock(&em_tree->lock); - em = lookup_extent_mapping(em_tree, logical, len); - read_unlock(&em_tree->lock); - BUG_ON(!em); + em = get_chunk_map(fs_info, logical, len); + BUG_ON(IS_ERR(em)); - BUG_ON(em->start > logical || em->start + em->len < logical); map = em->map_lookup; if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) len = map->stripe_len * nr_data_stripes(map); @@ -5195,20 +5177,16 @@ unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info, return len; } -int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree, +int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, u64 logical, u64 len, int mirror_num) { struct extent_map *em; struct map_lookup *map; - struct extent_map_tree *em_tree = &map_tree->map_tree; int ret = 0; - read_lock(&em_tree->lock); - em = lookup_extent_mapping(em_tree, logical, len); - read_unlock(&em_tree->lock); - BUG_ON(!em); + em = get_chunk_map(fs_info, logical, len); + BUG_ON(IS_ERR(em)); - BUG_ON(em->start > logical || em->start + em->len < logical); map = em->map_lookup; if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) ret = 1; @@ -5328,8 +5306,6 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, { struct extent_map *em; struct map_lookup *map; - struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; - struct extent_map_tree *em_tree = &map_tree->map_tree; u64 offset; u64 stripe_offset; u64 stripe_end_offset; @@ -5351,23 +5327,9 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, u64 physical_to_patch_in_first_stripe = 0; u64 raid56_full_stripe_start = (u64)-1; - read_lock(&em_tree->lock); - em = lookup_extent_mapping(em_tree, logical, *length); - read_unlock(&em_tree->lock); - - if (!em) { - btrfs_crit(fs_info, "unable to find logical %llu len %llu", - logical, *length); - return -EINVAL; - } - - if (em->start > logical || em->start + em->len < logical) { - btrfs_crit(fs_info, - "found a bad mapping, wanted %Lu, found %Lu-%Lu", - logical, em->start, em->start + em->len); - free_extent_map(em); - return -EINVAL; - } + em = get_chunk_map(fs_info, logical, *length); + if (IS_ERR(em)) + return PTR_ERR(em); map = em->map_lookup; offset = logical - em->start; @@ -5903,8 +5865,6 @@ int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start, u64 physical, u64 devid, u64 **logical, int *naddrs, int *stripe_len) { - struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; - struct extent_map_tree *em_tree = &map_tree->map_tree; struct extent_map *em; struct map_lookup *map; u64 *buf; @@ -5914,24 +5874,11 @@ int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 rmap_len; int i, j, nr = 0; - read_lock(&em_tree->lock); - em = lookup_extent_mapping(em_tree, chunk_start, 1); - read_unlock(&em_tree->lock); - - if (!em) { - btrfs_err(fs_info, "couldn't find em for chunk %Lu", - chunk_start); + em = get_chunk_map(fs_info, chunk_start, 1); + if (IS_ERR(em)) return -EIO; - } - if (em->start != chunk_start) { - btrfs_err(fs_info, "bad chunk start, em=%Lu, wanted=%Lu", - em->start, chunk_start); - free_extent_map(em); - return -EIO; - } map = em->map_lookup; - length = em->len; rmap_len = map->stripe_len; diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index ac0bf7d0df60..9ee6b706db31 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -475,7 +475,7 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info, struct btrfs_device *tgtdev); void btrfs_scratch_superblocks(struct block_device *bdev, const char *device_path); -int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree, +int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, u64 logical, u64 len, int mirror_num); unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info, struct btrfs_mapping_tree *map_tree,