[XFS] Fix problems with synchronous writes returning EAGAIN incorrectly

for pinned inodes.

SGI-PV: 930364
SGI-Modid: xfs-linux-melb:xfs-kern:21460a
Signed-off-by: Nathan Scott <nathans@sgi.com>

fs/xfs/linux-2.6/xfs_lrw.c

@@ -962,10 +962,10 @@ xfs_write(
 				xfs_trans_set_sync(tp);
 				error = xfs_trans_commit(tp, 0, NULL);
 				xfs_iunlock(xip, XFS_ILOCK_EXCL);
+			}
 			if (error)
 				goto out_unlock_internal;
 		}
-		}
 	
 		xfs_rwunlock(bdp, locktype);
 		if (need_isem)

fs/xfs/linux-2.6/xfs_super.c

@@ -348,6 +348,12 @@ linvfs_write_inode(
 		if (sync)
 			flags |= FLUSH_SYNC;
 		VOP_IFLUSH(vp, flags, error);
+		if (error == EAGAIN) {
+			if (sync)
+				VOP_IFLUSH(vp, flags | FLUSH_LOG, error);
+			else
+				error = 0;
+		}
 	}
 
 	return -error;

fs/xfs/xfs_vnodeops.c

@@ -3681,25 +3681,25 @@ xfs_inode_flush(
 {
 	xfs_inode_t	*ip;
 	xfs_mount_t	*mp;
+	xfs_inode_log_item_t *iip;
 	int		error = 0;
 
 	ip = XFS_BHVTOI(bdp);
 	mp = ip->i_mount;
+	iip = ip->i_itemp;
 
 	if (XFS_FORCED_SHUTDOWN(mp))
 		return XFS_ERROR(EIO);
 
-	/* Bypass inodes which have already been cleaned by
+	/*
+	 * Bypass inodes which have already been cleaned by
 	 * the inode flush clustering code inside xfs_iflush
 	 */
 	if ((ip->i_update_core == 0) &&
-	    ((ip->i_itemp == NULL) ||
-	     !(ip->i_itemp->ili_format.ilf_fields & XFS_ILOG_ALL)))
+	    ((iip == NULL) || !(iip->ili_format.ilf_fields & XFS_ILOG_ALL)))
 		return 0;
 
 	if (flags & FLUSH_LOG) {
-		xfs_inode_log_item_t *iip = ip->i_itemp;
-
 		if (iip && iip->ili_last_lsn) {
 			xlog_t		*log = mp->m_log;
 			xfs_lsn_t	sync_lsn;
@@ -3714,12 +3714,12 @@ xfs_inode_flush(
 
 			if (flags & FLUSH_SYNC)
 				log_flags |= XFS_LOG_SYNC;
-			return xfs_log_force(mp, iip->ili_last_lsn,
-						log_flags);
+			return xfs_log_force(mp, iip->ili_last_lsn, log_flags);
 		}
 	}
 
-	/* We make this non-blocking if the inode is contended,
+	/*
+	 * We make this non-blocking if the inode is contended,
 	 * return EAGAIN to indicate to the caller that they
 	 * did not succeed. This prevents the flush path from
 	 * blocking on inodes inside another operation right