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| author | Josef Bacik <josef@redhat.com> | 2011-01-25 22:30:38 +0100 |
|---|---|---|
| committer | Josef Bacik <josef@redhat.com> | 2011-03-17 19:21:18 +0100 |
| commit | 57a45ced94fe48a701361d64230fc16eefa189dd (patch) | |
| tree | 8f0cfe52ba0b3fb8a6ed3cc5d3e7449369b0b9a5 /fs/btrfs/inode.c | |
| parent | Btrfs: fix how we deal with the pages array in the write path (diff) | |
| download | linux-57a45ced94fe48a701361d64230fc16eefa189dd.tar.xz linux-57a45ced94fe48a701361d64230fc16eefa189dd.zip | |
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/inode.c')
| -rw-r--r-- | fs/btrfs/inode.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 9007bbd01dbf..d97b69afbbfb 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -6632,9 +6632,8 @@ struct inode *btrfs_alloc_inode(struct super_block *sb) ei->index_cnt = (u64)-1; ei->last_unlink_trans = 0; - spin_lock_init(&ei->accounting_lock); atomic_set(&ei->outstanding_extents, 0); - ei->reserved_extents = 0; + atomic_set(&ei->reserved_extents, 0); ei->ordered_data_close = 0; ei->orphan_meta_reserved = 0; @@ -6670,7 +6669,7 @@ void btrfs_destroy_inode(struct inode *inode) WARN_ON(!list_empty(&inode->i_dentry)); WARN_ON(inode->i_data.nrpages); WARN_ON(atomic_read(&BTRFS_I(inode)->outstanding_extents)); - WARN_ON(BTRFS_I(inode)->reserved_extents); + WARN_ON(atomic_read(&BTRFS_I(inode)->reserved_extents)); /* * This can happen where we create an inode, but somebody else also |