Btrfs: fix recursive defragment with autodefrag option

$ mkfs.btrfs disk
$ mount disk /mnt -o autodefrag
$ dd if=/dev/zero of=/mnt/foobar bs=4k count=10 2>/dev/null && sync
$ for i in `seq 9 -2 0`; do dd if=/dev/zero of=/mnt/foobar bs=4k count=1 \
  seek=$i conv=notrunc 2> /dev/null; done && sync

then we'll get to defrag "foobar" again and again.
So does option "-o autodefrag,compress".

Reasons:
When the cleaner kthread gets to fetch inodes from the defrag tree and defrag
them, it will dirty pages and submit them, this will comes to another DATA COW
where the processing inode will be inserted to the defrag tree again.

This patch sets a rule for COW code, i.e. insert an inode when we're really
going to make some defragments.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index eb6aec7bbacb5de71966d27e10809ad917ed80ff..1be31368e881a2c88f2b4ea1f96373bfdaa19786 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -347,8 +347,9 @@ static noinline int compress_file_range(struct inode *inode,
        int will_compress;
        int compress_type = root->fs_info->compress_type;
 
-       /* if this is a small write inside eof, kick off a defragbot */
-       if (end <= BTRFS_I(inode)->disk_i_size && (end - start + 1) < 16 * 1024)
+       /* if this is a small write inside eof, kick off a defrag */
+       if ((end - start + 1) < 16 * 1024 &&
+           (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
                btrfs_add_inode_defrag(NULL, inode);
 
        actual_end = min_t(u64, isize, end + 1);
@@ -843,7 +844,8 @@ static noinline int cow_file_range(struct inode *inode,
        ret = 0;
 
        /* if this is a small write inside eof, kick off defrag */
-       if (end <= BTRFS_I(inode)->disk_i_size && num_bytes < 64 * 1024)
+       if (num_bytes < 64 * 1024 &&
+           (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
                btrfs_add_inode_defrag(trans, inode);
 
        if (start == 0) {