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authorLiu Bo <liubo2009@cn.fujitsu.com>2012-03-29 09:57:45 -0400
committerChris Mason <chris.mason@oracle.com>2012-03-29 09:57:45 -0400
commit4cb13e5d6ecc47b91b24a35f8fbc2c9f33d075fe (patch)
treec1654f1b2f029c8cfd5385568b37f90a0b47f3c4 /fs/btrfs
parent1f12bd063285b059cb63315d1424dae1ddd87a64 (diff)
downloadlinux-stericsson-4cb13e5d6ecc47b91b24a35f8fbc2c9f33d075fe.tar.gz
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>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/inode.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index eb6aec7bbacb..1be31368e881 100644
--- 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) {