[XFS] replace the XFS buf iodone semaphore with a completion

The xfs_buf_t b_iodonesema is really just a semaphore that wants to be a
completion. Change it to a completion and remove the last user of the
sema_t from XFS.

SGI-PV: 981498

SGI-Modid: xfs-linux-melb:xfs-kern:31815a

Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h
index 29d1d4adc078..fe0109956656 100644
--- a/fs/xfs/linux-2.6/xfs_buf.h
+++ b/fs/xfs/linux-2.6/xfs_buf.h
@@ -157,7 +157,7 @@ typedef struct xfs_buf {
         xfs_buf_iodone_t        b_iodone;       /* I/O completion function */
         xfs_buf_relse_t         b_relse;        /* releasing function */
         xfs_buf_bdstrat_t       b_strat;        /* pre-write function */
-        struct semaphore        b_iodonesema;   /* Semaphore for I/O waiters */
+        struct completion       b_iowait;       /* queue for I/O waiters */
         void                    *b_fspriv;
         void                    *b_fspriv2;
         void                    *b_fspriv3;
@@ -352,7 +352,7 @@ extern void xfs_buf_trace(xfs_buf_t *, char *, void *, void *);
 #define XFS_BUF_CPSEMA(bp)      (xfs_buf_cond_lock(bp) == 0)
 #define XFS_BUF_VSEMA(bp)       xfs_buf_unlock(bp)
 #define XFS_BUF_PSEMA(bp,x)     xfs_buf_lock(bp)
-#define XFS_BUF_V_IODONESEMA(bp) up(&bp->b_iodonesema);
+#define XFS_BUF_FINISH_IOWAIT(bp)       complete(&bp->b_iowait);
 
 #define XFS_BUF_SET_TARGET(bp, target)  ((bp)->b_target = (target))
 #define XFS_BUF_TARGET(bp)              ((bp)->b_target)