[XFS] Fixed delayed_blks assert failure during umount. The delayed_blks

was caused by ENOSPC but not Rreclaimed by xfs_release or xfs_inactive.
The fix changed the condition in xfs_release and xfs_inactive to invoke
xfs_inactive_free_eofblocks for this special case, changed
xfs_inactive_free_eofblocks to clean the delayed blks after eof. It also
changed xfs_write to set correct eof when ENOSPC occurs.

SGI-PV: 946267
SGI-Modid: xfs-linux-melb:xfs-kern:203788a
Signed-off-by: Yingping Lu <yingping@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>

fs/xfs/linux-2.6/xfs_lrw.c

@@ -809,6 +809,10 @@ retry:
 		goto retry;
 	}
 
+	isize = i_size_read(inode);
+	if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize))
+		*offset = isize;
+
 	if (*offset > xip->i_d.di_size) {
 		xfs_ilock(xip, XFS_ILOCK_EXCL);
 		if (*offset > xip->i_d.di_size) {

fs/xfs/xfs_vnodeops.c

@@ -1213,7 +1213,8 @@ xfs_inactive_free_eofblocks(
 	xfs_iunlock(ip, XFS_ILOCK_SHARED);
 
 	if (!error && (nimaps != 0) &&
-	    (imap.br_startblock != HOLESTARTBLOCK)) {
+	    (imap.br_startblock != HOLESTARTBLOCK ||
+	     ip->i_delayed_blks)) {
 		/*
 		 * Attach the dquots to the inode up front.
 		 */
@@ -1548,7 +1549,8 @@ xfs_release(
 
 	if (ip->i_d.di_nlink != 0) {
 		if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) &&
-		     ((ip->i_d.di_size > 0) || (VN_CACHED(vp) > 0)) &&
+		     ((ip->i_d.di_size > 0) || (VN_CACHED(vp) > 0 ||
+		       ip->i_delayed_blks > 0)) &&
 		     (ip->i_df.if_flags & XFS_IFEXTENTS))  &&
 		    (!(ip->i_d.di_flags &
 				(XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
@@ -1627,7 +1629,8 @@ xfs_inactive(
 
 	if (ip->i_d.di_nlink != 0) {
 		if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) &&
-		     ((ip->i_d.di_size > 0) || (VN_CACHED(vp) > 0)) &&
+                     ((ip->i_d.di_size > 0) || (VN_CACHED(vp) > 0 ||
+                       ip->i_delayed_blks > 0)) &&
 		      (ip->i_df.if_flags & XFS_IFEXTENTS) &&
 		     (!(ip->i_d.di_flags &
 				(XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||