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authorJosef Bacik <josef@redhat.com>2011-07-15 19:16:44 +0400
committerChris Mason <chris.mason@oracle.com>2011-07-27 20:46:44 +0400
commit9e0baf60dea69f31ac3b1adeb35b03b02a53e8e1 (patch)
tree0fb899e1fa78b599d22389ca3befc8ab51ff5049 /fs/btrfs/file.c
parenta5991428064e98c7367fe1c1686ea6a23fb6a4b3 (diff)
downloadlinux-9e0baf60dea69f31ac3b1adeb35b03b02a53e8e1.tar.xz
Btrfs: fix enospc problems with delalloc
So I had this brilliant idea to use atomic counters for outstanding and reserved extents, but this turned out to be a bad idea. Consider this where we have 1 outstanding extent and 1 reserved extent Reserver Releaser atomic_dec(outstanding) now 0 atomic_read(outstanding)+1 get 1 atomic_read(reserved) get 1 don't actually reserve anything because they are the same atomic_cmpxchg(reserved, 1, 0) atomic_inc(outstanding) atomic_add(0, reserved) free reserved space for 1 extent Then the reserver now has no actual space reserved for it, and when it goes to finish the ordered IO it won't have enough space to do it's allocation and you get those lovely warnings. Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/file.c')
-rw-r--r--fs/btrfs/file.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index bd6bbb877ff2..6e56a468d1f5 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1239,9 +1239,11 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
* managed to copy.
*/
if (num_pages > dirty_pages) {
- if (copied > 0)
- atomic_inc(
- &BTRFS_I(inode)->outstanding_extents);
+ if (copied > 0) {
+ spin_lock(&BTRFS_I(inode)->lock);
+ BTRFS_I(inode)->outstanding_extents++;
+ spin_unlock(&BTRFS_I(inode)->lock);
+ }
btrfs_delalloc_release_space(inode,
(num_pages - dirty_pages) <<
PAGE_CACHE_SHIFT);