4.9-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 4751832da990a927c37526ae67b9226ea01eb99e ]
[BUG] Cycle mount btrfs can cause fiemap to return different result. Like: # mount /dev/vdb5 /mnt/btrfs # dd if=/dev/zero bs=16K count=4 oflag=dsync of=/mnt/btrfs/file # xfs_io -c "fiemap -v" /mnt/btrfs/file /mnt/test/file: EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS 0: [0..127]: 25088..25215 128 0x1 # umount /mnt/btrfs # mount /dev/vdb5 /mnt/btrfs # xfs_io -c "fiemap -v" /mnt/btrfs/file /mnt/test/file: EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS 0: [0..31]: 25088..25119 32 0x0 1: [32..63]: 25120..25151 32 0x0 2: [64..95]: 25152..25183 32 0x0 3: [96..127]: 25184..25215 32 0x1 But after above fiemap, we get correct merged result if we call fiemap again. # xfs_io -c "fiemap -v" /mnt/btrfs/file /mnt/test/file: EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS 0: [0..127]: 25088..25215 128 0x1
[REASON] Btrfs will try to merge extent map when inserting new extent map.
btrfs_fiemap(start=0 len=(u64)-1) |- extent_fiemap(start=0 len=(u64)-1) |- get_extent_skip_holes(start=0 len=64k) | |- btrfs_get_extent_fiemap(start=0 len=64k) | |- btrfs_get_extent(start=0 len=64k) | | Found on-disk (ino, EXTENT_DATA, 0) | |- add_extent_mapping() | |- Return (em->start=0, len=16k) | |- fiemap_fill_next_extent(logic=0 phys=X len=16k) | |- get_extent_skip_holes(start=0 len=64k) | |- btrfs_get_extent_fiemap(start=0 len=64k) | |- btrfs_get_extent(start=16k len=48k) | | Found on-disk (ino, EXTENT_DATA, 16k) | |- add_extent_mapping() | | |- try_merge_map() | | Merge with previous em start=0 len=16k | | resulting em start=0 len=32k | |- Return (em->start=0, len=32K) << Merged result |- Stripe off the unrelated range (0~16K) of return em |- fiemap_fill_next_extent(logic=16K phys=X+16K len=16K) ^^^ Causing split fiemap extent.
And since in add_extent_mapping(), em is already merged, in next fiemap() call, we will get merged result.
[FIX] Here we introduce a new structure, fiemap_cache, which records previous fiemap extent.
And will always try to merge current fiemap_cache result before calling fiemap_fill_next_extent(). Only when we failed to merge current fiemap extent with cached one, we will call fiemap_fill_next_extent() to submit cached one.
So by this method, we can merge all fiemap extents.
It can also be done in fs/ioctl.c, however the problem is if fieinfo->fi_extents_max == 0, we have no space to cache previous fiemap extent. So I choose to merge it in btrfs.
Signed-off-by: Qu Wenruo quwenruo@cn.fujitsu.com Reviewed-by: Liu Bo bo.li.liu@oracle.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/btrfs/extent_io.c | 124 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 122 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 2b96ca68dc10..5feaef9bcbda 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -4377,6 +4377,123 @@ static struct extent_map *get_extent_skip_holes(struct inode *inode, return NULL; }
+/* + * To cache previous fiemap extent + * + * Will be used for merging fiemap extent + */ +struct fiemap_cache { + u64 offset; + u64 phys; + u64 len; + u32 flags; + bool cached; +}; + +/* + * Helper to submit fiemap extent. + * + * Will try to merge current fiemap extent specified by @offset, @phys, + * @len and @flags with cached one. + * And only when we fails to merge, cached one will be submitted as + * fiemap extent. + * + * Return value is the same as fiemap_fill_next_extent(). + */ +static int emit_fiemap_extent(struct fiemap_extent_info *fieinfo, + struct fiemap_cache *cache, + u64 offset, u64 phys, u64 len, u32 flags) +{ + int ret = 0; + + if (!cache->cached) + goto assign; + + /* + * Sanity check, extent_fiemap() should have ensured that new + * fiemap extent won't overlap with cahced one. + * Not recoverable. + * + * NOTE: Physical address can overlap, due to compression + */ + if (cache->offset + cache->len > offset) { + WARN_ON(1); + return -EINVAL; + } + + /* + * Only merges fiemap extents if + * 1) Their logical addresses are continuous + * + * 2) Their physical addresses are continuous + * So truly compressed (physical size smaller than logical size) + * extents won't get merged with each other + * + * 3) Share same flags except FIEMAP_EXTENT_LAST + * So regular extent won't get merged with prealloc extent + */ + if (cache->offset + cache->len == offset && + cache->phys + cache->len == phys && + (cache->flags & ~FIEMAP_EXTENT_LAST) == + (flags & ~FIEMAP_EXTENT_LAST)) { + cache->len += len; + cache->flags |= flags; + goto try_submit_last; + } + + /* Not mergeable, need to submit cached one */ + ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys, + cache->len, cache->flags); + cache->cached = false; + if (ret) + return ret; +assign: + cache->cached = true; + cache->offset = offset; + cache->phys = phys; + cache->len = len; + cache->flags = flags; +try_submit_last: + if (cache->flags & FIEMAP_EXTENT_LAST) { + ret = fiemap_fill_next_extent(fieinfo, cache->offset, + cache->phys, cache->len, cache->flags); + cache->cached = false; + } + return ret; +} + +/* + * Sanity check for fiemap cache + * + * All fiemap cache should be submitted by emit_fiemap_extent() + * Iteration should be terminated either by last fiemap extent or + * fieinfo->fi_extents_max. + * So no cached fiemap should exist. + */ +static int check_fiemap_cache(struct btrfs_fs_info *fs_info, + struct fiemap_extent_info *fieinfo, + struct fiemap_cache *cache) +{ + int ret; + + if (!cache->cached) + return 0; + + /* Small and recoverbale problem, only to info developer */ +#ifdef CONFIG_BTRFS_DEBUG + WARN_ON(1); +#endif + btrfs_warn(fs_info, + "unhandled fiemap cache detected: offset=%llu phys=%llu len=%llu flags=0x%x", + cache->offset, cache->phys, cache->len, cache->flags); + ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys, + cache->len, cache->flags); + cache->cached = false; + if (ret > 0) + ret = 0; + return ret; +} + int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, __u64 start, __u64 len, get_extent_t *get_extent) { @@ -4394,6 +4511,7 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, struct extent_state *cached_state = NULL; struct btrfs_path *path; struct btrfs_root *root = BTRFS_I(inode)->root; + struct fiemap_cache cache = { 0 }; int end = 0; u64 em_start = 0; u64 em_len = 0; @@ -4573,8 +4691,8 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, flags |= FIEMAP_EXTENT_LAST; end = 1; } - ret = fiemap_fill_next_extent(fieinfo, em_start, disko, - em_len, flags); + ret = emit_fiemap_extent(fieinfo, &cache, em_start, disko, + em_len, flags); if (ret) { if (ret == 1) ret = 0; @@ -4582,6 +4700,8 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, } } out_free: + if (!ret) + ret = check_fiemap_cache(root->fs_info, fieinfo, &cache); free_extent_map(em); out: btrfs_free_path(path);