Btrfs: change reserved_extents to an atomic_t

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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>

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This commit is contained in:

Josef Bacik 2011-01-25 16:30:38 -05:00

parent 4a64001f00

commit 57a45ced94

3 changed files with 29 additions and 21 deletions

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3

fs/btrfs/btrfs_inode.h

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42

fs/btrfs/extent-tree.c

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5

fs/btrfs/inode.c

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