diff options
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/ioctl.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 7154c87d1add..df92c956fba8 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1020,6 +1020,13 @@ static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start, return em; } +static u32 get_extent_max_capacity(const struct extent_map *em) +{ + if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) + return BTRFS_MAX_COMPRESSED; + return BTRFS_MAX_EXTENT_SIZE; +} + static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em, bool locked) { @@ -1036,6 +1043,12 @@ static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em, goto out; if (test_bit(EXTENT_FLAG_PREALLOC, &next->flags)) goto out; + /* + * If the next extent is at its max capacity, defragging current extent + * makes no sense, as the total number of extents won't change. + */ + if (next->len >= get_extent_max_capacity(em)) + goto out; /* Physically adjacent and large enough */ if ((em->block_start + em->block_len == next->block_start) && (em->block_len > SZ_128K && next->block_len > SZ_128K)) @@ -1233,6 +1246,13 @@ static int defrag_collect_targets(struct btrfs_inode *inode, if (range_len >= extent_thresh) goto next; + /* + * Skip extents already at its max capacity, this is mostly for + * compressed extents, which max cap is only 128K. + */ + if (em->len >= get_extent_max_capacity(em)) + goto next; + next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em, locked); if (!next_mergeable) { |