From a43a21113365e5a9b59efc411da715d910cca87c Mon Sep 17 00:00:00 2001 From: Andrew Mahone Date: Tue, 19 Jun 2012 21:08:32 -0400 Subject: [PATCH] btrfs: ignore unfragmented file checks in defrag when compression enabled - rebased Rebased on btrfs-next and retested. Inform should_defrag_range if BTRFS_DEFRAG_RANGE_COMPRESS is set. If so, skip checks for adjacent extents and extent size when deciding whether to defrag, as these can prevent an uncompressed and unfragmented file from being compressed as requested. Signed-off-by: Andrew Mahone --- fs/btrfs/ioctl.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 0e92e57..9ec23b9 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -832,7 +832,8 @@ static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) } static int should_defrag_range(struct inode *inode, u64 start, int thresh, - u64 *last_len, u64 *skip, u64 *defrag_end) + u64 *last_len, u64 *skip, u64 *defrag_end, + int compress) { struct extent_map *em; int ret = 1; @@ -863,7 +864,7 @@ static int should_defrag_range(struct inode *inode, u64 start, int thresh, * we hit a real extent, if it is big or the next extent is not a * real extent, don't bother defragging it */ - if ((*last_len == 0 || *last_len >= thresh) && + if (!compress && (*last_len == 0 || *last_len >= thresh) && (em->len >= thresh || !next_mergeable)) ret = 0; out: @@ -1145,7 +1146,8 @@ int btrfs_defrag_file(struct inode *inode, struct file *file, if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, extent_thresh, &last_len, &skip, - &defrag_end)) { + &defrag_end, range->flags & + BTRFS_DEFRAG_RANGE_COMPRESS)) { unsigned long next; /* * the should_defrag function tells us how much to skip -- 2.7.4