[XFS] Put the correct offset in dirent d_off

The recent filldir regression fix was not putting the correct d_off in
each dirent. This was resulting in incorrect cookies being passed to dmapi
ioctls and the wrong offset appearing in the dirents. readdir was
unaffected as the filp->f_pos was being updated with the correct offset
and this was being written into the last dirent in each buffer. Fix the
XFS code to do the right thing.

SGI-PV: 973746
SGI-Modid: xfs-linux-melb:xfs-kern:30240a
Signed-off-by: NDavid Chinner <dgc@sgi.com>
Signed-off-by: NChristoph Hellwig <hch@infradead.org>
Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>

fs/xfs/linux-2.6/xfs_file.c

@@ -356,13 +356,13 @@ xfs_file_readdir(
 
 			reclen = sizeof(struct hack_dirent) + de->namlen;
 			size -= reclen;
-			curr_offset = de->offset /* & 0x7fffffff */;
 			de = (struct hack_dirent *)((char *)de + reclen);
+			curr_offset = de->offset /* & 0x7fffffff */;
 		}
 	}
 
  done:
- 	if (!error) {
+	if (!error) {
 		if (size == 0)
 			filp->f_pos = offset & 0x7fffffff;
 		else if (de)

fs/xfs/xfs_dir2_block.c

@@ -508,7 +508,7 @@ xfs_dir2_block_getdents(
 			continue;
 
 		cook = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
-						    ptr - (char *)block);
+					    (char *)dep - (char *)block);
 		ino = be64_to_cpu(dep->inumber);
 #if XFS_BIG_INUMS
 		ino += mp->m_inoadd;
@@ -519,9 +519,7 @@ xfs_dir2_block_getdents(
 		 */
 		if (filldir(dirent, dep->name, dep->namelen, cook,
 			    ino, DT_UNKNOWN)) {
-			*offset = xfs_dir2_db_off_to_dataptr(mp,
-					mp->m_dirdatablk,
-					(char *)dep - (char *)block);
+			*offset = cook;
 			xfs_da_brelse(NULL, bp);
 			return 0;
 		}

fs/xfs/xfs_dir2_leaf.c

@@ -1091,7 +1091,7 @@ xfs_dir2_leaf_getdents(
 		 * Won't fit.  Return to caller.
 		 */
 		if (filldir(dirent, dep->name, dep->namelen,
-			    xfs_dir2_byte_to_dataptr(mp, curoff + length),
+			    xfs_dir2_byte_to_dataptr(mp, curoff),
 			    ino, DT_UNKNOWN))
 			break;
 

fs/xfs/xfs_dir2_sf.c

@@ -752,7 +752,7 @@ xfs_dir2_sf_getdents(
 #if XFS_BIG_INUMS
 		ino += mp->m_inoadd;
 #endif
-		if (filldir(dirent, ".", 1, dotdot_offset, ino, DT_DIR)) {
+		if (filldir(dirent, ".", 1, dot_offset, ino, DT_DIR)) {
 			*offset = dot_offset;
 			return 0;
 		}
@@ -762,13 +762,11 @@ xfs_dir2_sf_getdents(
 	 * Put .. entry unless we're starting past it.
 	 */
 	if (*offset <= dotdot_offset) {
-		off = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
-						  XFS_DIR2_DATA_FIRST_OFFSET);
 		ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
 #if XFS_BIG_INUMS
 		ino += mp->m_inoadd;
 #endif
-		if (filldir(dirent, "..", 2, off, ino, DT_DIR)) {
+		if (filldir(dirent, "..", 2, dotdot_offset, ino, DT_DIR)) {
 			*offset = dotdot_offset;
 			return 0;
 		}
@@ -793,8 +791,7 @@ xfs_dir2_sf_getdents(
 #endif
 
 		if (filldir(dirent, sfep->name, sfep->namelen,
-			    off + xfs_dir2_data_entsize(sfep->namelen),
-			    ino, DT_UNKNOWN)) {
+					    off, ino, DT_UNKNOWN)) {
 			*offset = off;
 			return 0;
 		}