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| author | Christoph Hellwig <hch@infradead.org> | 2011-12-18 20:00:10 +0000 |
|---|---|---|
| committer | Ben Myers <bpm@sgi.com> | 2012-01-17 15:07:54 -0600 |
| commit | f392e6319a4e9a028b0c8b48f000bb01d660ad53 (patch) | |
| tree | 6cf97bebb841da303056b60da087e76cc087af9b /fs/xfs/xfs_inode.c | |
| parent | 474fce067521a40dbacc722e8ba119e81c2d31bf (diff) | |
| download | linux-stable-f392e6319a4e9a028b0c8b48f000bb01d660ad53.tar.gz linux-stable-f392e6319a4e9a028b0c8b48f000bb01d660ad53.tar.bz2 linux-stable-f392e6319a4e9a028b0c8b48f000bb01d660ad53.zip | |
xfs: replace i_pin_wait with a bit waitqueue
Replace i_pin_wait, which is only used during synchronous inode flushing
with a bit waitqueue. This trades off a much smaller inode against
slightly slower wakeup performance, and saves 12 (32-bit) or 20 (64-bit)
bytes in the XFS inode.
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_inode.c')
| -rw-r--r-- | fs/xfs/xfs_inode.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index eeb60d31b086..62603369b523 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -2037,7 +2037,7 @@ xfs_idestroy_fork( * once someone is waiting for it to be unpinned. */ static void -xfs_iunpin_nowait( +xfs_iunpin( struct xfs_inode *ip) { ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)); @@ -2049,14 +2049,29 @@ xfs_iunpin_nowait( } +static void +__xfs_iunpin_wait( + struct xfs_inode *ip) +{ + wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IPINNED_BIT); + DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IPINNED_BIT); + + xfs_iunpin(ip); + + do { + prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); + if (xfs_ipincount(ip)) + io_schedule(); + } while (xfs_ipincount(ip)); + finish_wait(wq, &wait.wait); +} + void xfs_iunpin_wait( struct xfs_inode *ip) { - if (xfs_ipincount(ip)) { - xfs_iunpin_nowait(ip); - wait_event(ip->i_ipin_wait, (xfs_ipincount(ip) == 0)); - } + if (xfs_ipincount(ip)) + __xfs_iunpin_wait(ip); } /* @@ -2415,7 +2430,7 @@ xfs_iflush( * out for us if they occur after the log force completes. */ if (!(flags & SYNC_WAIT) && xfs_ipincount(ip)) { - xfs_iunpin_nowait(ip); + xfs_iunpin(ip); xfs_ifunlock(ip); return EAGAIN; } |