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xfs: replace i_pin_wait with a bit waitqueue

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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>
This commit is contained in:
Christoph Hellwig
2011-12-18 20:00:10 +00:00
committed by Ben Myers
parent 474fce0675
commit f392e6319a
4 changed files with 24 additions and 9 deletions
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27
fs/xfs/xfs_inode.c
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@ -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;
}