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authorJosef Bacik <josef@redhat.com>2011-01-25 16:30:38 -0500
committerJosef Bacik <josef@redhat.com>2011-03-17 14:21:18 -0400
commit57a45ced94fe48a701361d64230fc16eefa189dd (patch)
tree8f0cfe52ba0b3fb8a6ed3cc5d3e7449369b0b9a5 /fs/btrfs/btrfs_inode.h
parent4a64001f0047956e283f7ada9843dfc3f3b5d8c8 (diff)
Btrfs: change reserved_extents to an atomic_t
We track delayed allocation per inodes via 2 counters, one is outstanding_extents and reserved_extents. Outstanding_extents is already an atomic_t, but reserved_extents is not and is protected by a spinlock. So convert this to an atomic_t and instead of using a spinlock, use atomic_cmpxchg when releasing delalloc bytes. This makes our inode 72 bytes smaller, and reduces locking overhead (albiet it was minimal to begin with). Thanks, Signed-off-by: Josef Bacik <josef@redhat.com>
Diffstat (limited to 'fs/btrfs/btrfs_inode.h')
-rw-r--r--fs/btrfs/btrfs_inode.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index ccc991c542df..57c3bb2884ce 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -136,9 +136,8 @@ struct btrfs_inode {
* items we think we'll end up using, and reserved_extents is the number
* of extent items we've reserved metadata for.
*/
- spinlock_t accounting_lock;
atomic_t outstanding_extents;
- int reserved_extents;
+ atomic_t reserved_extents;
/*
* ordered_data_close is set by truncate when a file that used