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| author | Liu Bo <liubo2009@cn.fujitsu.com> | 2012-03-29 13:57:45 (GMT) |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2012-03-29 13:57:45 (GMT) |
| commit | 66c2689226ac322fbc9acd2e8e418b78dcd52f51 (patch) | |
| tree | 98da1733c2fc92e00c32c50199d1c85a43c1e6d0 | |
| parent | 17ce6ef8d731af5edac8c39e806db4c7e1f6956f (diff) | |
| download | linux-66c2689226ac322fbc9acd2e8e418b78dcd52f51.tar.xz | |
Btrfs: do not bother to defrag an extent if it is a big real extent
$ mkfs.btrfs /dev/sdb7
$ mount /dev/sdb7 /mnt/btrfs/ -oautodefrag
$ dd if=/dev/zero of=/mnt/btrfs/foobar bs=4k count=10 oflag=direct 2>/dev/null
$ filefrag -v /mnt/btrfs/foobar
Filesystem type is: 9123683e
File size of /mnt/btrfs/foobar is 40960 (10 blocks, blocksize 4096)
ext logical physical expected length flags
0 0 3072 10 eof
/mnt/btrfs/foobar: 1 extent found
Now we have a big real extent [0, 40960), but autodefrag will still defrag it.
$ sync
$ filefrag -v /mnt/btrfs/foobar
Filesystem type is: 9123683e
File size of /mnt/btrfs/foobar is 40960 (10 blocks, blocksize 4096)
ext logical physical expected length flags
0 0 3082 10 eof
/mnt/btrfs/foobar: 1 extent found
So if we already find a big real extent, we're ok about that, just skip it.
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
| -rw-r--r-- | fs/btrfs/ioctl.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 6c39d1a..afde837 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1140,12 +1140,9 @@ int btrfs_defrag_file(struct inode *inode, struct file *file, if (!(inode->i_sb->s_flags & MS_ACTIVE)) break; - if (!newer_than && - !should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, - PAGE_CACHE_SIZE, - extent_thresh, - &last_len, &skip, - &defrag_end)) { + if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, + PAGE_CACHE_SIZE, extent_thresh, + &last_len, &skip, &defrag_end)) { unsigned long next; /* * the should_defrag function tells us how much to skip |