[XFS] Alternate, cleaner fix for the ENOSPC/ACL lookup problem

SGI Modid: 2.5.x-xfs:slinx:157531a

fs/xfs/Makefile

@@ -65,7 +65,6 @@ xfs-$(CONFIG_SYSCTL)		+= linux/xfs_sysctl.o
 xfs-y				+= xfs_alloc.o \
 				   xfs_alloc_btree.o \
 				   xfs_attr.o \
-				   xfs_attr_fetch.o \
 				   xfs_attr_leaf.o \
 				   xfs_bit.o \
 				   xfs_bmap.o \

fs/xfs/xfs_attr.c

@@ -116,38 +116,38 @@ ktrace_t *xfs_attr_trace_buf;
  *========================================================================*/
 
 /*ARGSUSED*/
-int								/* error */
-xfs_attr_get(bhv_desc_t *bdp, char *name, char *value, int *valuelenp,
-	     int flags, struct cred *cred)
+STATIC int
+xfs_attr_get_int(xfs_inode_t *ip, char *name, char *value, int *valuelenp,
+	     int flags, int lock, struct cred *cred)
 {
 	xfs_da_args_t   args;
 	int             error;
 	int             namelen;
-	xfs_inode_t	*ip = XFS_BHVTOI(bdp);
 
-	if (!name)
-		return EINVAL;
 	ASSERT(MAXNAMELEN-1 <= 0xff);	/* length is stored in uint8 */
 	namelen = strlen(name);
 	if (namelen >= MAXNAMELEN)
-		return EFAULT;		/* match IRIX behaviour */
+		return(EFAULT);		/* match IRIX behaviour */
 	XFS_STATS_INC(xs_attr_get);
 
-	if (XFS_IFORK_Q(ip) == 0)
-		return ENOATTR;
-
-
 	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
-		return (EIO);
+		return(EIO);
+
+	if ((XFS_IFORK_Q(ip) == 0) ||
+	    (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
+	     ip->i_d.di_anextents == 0))
+		return(ENOATTR);
 
+	if (lock) {
+		xfs_ilock(ip, XFS_ILOCK_SHARED);
 		/*
 		 * Do we answer them, or ignore them?
 		 */
-	xfs_ilock(ip, XFS_ILOCK_SHARED);
-	if ((error = xfs_iaccess(XFS_BHVTOI(bdp), IREAD, cred))) {
+		if ((error = xfs_iaccess(ip, IREAD, cred))) {
 			xfs_iunlock(ip, XFS_ILOCK_SHARED);
 			return(XFS_ERROR(error));
 		}
+	}
 
 	/*
 	 * Fill in the arg structure for this request.
@@ -177,6 +177,8 @@ xfs_attr_get(bhv_desc_t *bdp, char *name, char *value, int *valuelenp,
 	} else {
 		error = xfs_attr_node_get(&args);
 	}
+
+	if (lock)
 		xfs_iunlock(ip, XFS_ILOCK_SHARED);
 
 	/*
@@ -189,6 +191,23 @@ xfs_attr_get(bhv_desc_t *bdp, char *name, char *value, int *valuelenp,
 	return(error);
 }
 
+int
+xfs_attr_fetch(xfs_inode_t *ip, char *name, char *value, int valuelen)
+{
+	return xfs_attr_get_int(ip, name, value, &valuelen, ATTR_ROOT, 0, NULL);
+}
+
+int
+xfs_attr_get(bhv_desc_t *bdp, char *name, char *value, int *valuelenp,
+	     int flags, struct cred *cred)
+{
+	xfs_inode_t	*ip = XFS_BHVTOI(bdp);
+
+	if (!name)
+		return(EINVAL);
+	return xfs_attr_get_int(ip, name, value, valuelenp, flags, 1, cred);
+}
+
 /*ARGSUSED*/
 int								/* error */
 xfs_attr_set(bhv_desc_t *bdp, char *name, char *value, int valuelen, int flags,
@@ -1718,7 +1737,6 @@ xfs_attr_node_get(xfs_da_args_t *args)
 	int i;
 
 	state = xfs_da_state_alloc();
-	state->holeok = 1;
 	state->args = args;
 	state->mp = args->dp->i_mount;
 	state->blocksize = state->mp->m_sb.sb_blocksize;

fs/xfs/xfs_da_btree.c

@@ -1141,12 +1141,10 @@ xfs_da_node_lookup_int(xfs_da_state_t *state, int *result)
 	xfs_da_node_entry_t *btree;
 	xfs_dablk_t blkno;
 	int probe, span, max, error, retval;
-	xfs_daddr_t mappedbno;
 	xfs_dahash_t hashval;
 	xfs_da_args_t *args;
 
 	args = state->args;
-	mappedbno = state->holeok ? -2 : -1;
 
 	/*
 	 * Descend thru the B-tree searching each level for the right
@@ -1164,9 +1162,7 @@ xfs_da_node_lookup_int(xfs_da_state_t *state, int *result)
 		 */
 		blk->blkno = blkno;
 		error = xfs_da_read_buf(args->trans, args->dp, blkno,
-					mappedbno, &blk->bp, args->whichfork);
-		if (!error && unlikely(state->holeok && !blk->bp))
-			error = XFS_ERROR(ENOATTR);	/* always attr here */
+					-1, &blk->bp, args->whichfork);
 		if (error) {
 			blk->blkno = 0;
 			state->path.active--;

fs/xfs/xfs_da_btree.h

@@ -253,7 +253,6 @@ typedef struct xfs_da_state {
 	xfs_da_state_path_t	path;		/* search/split paths */
 	xfs_da_state_path_t	altpath;	/* alternate path for join */
 	unsigned char		inleaf;		/* insert into 1->lf, 0->splf */
-	unsigned char		holeok;		/* T/F: can deal with a hole */
 	unsigned char		extravalid;	/* T/F: extrablk is in use */
 	unsigned char		extraafter;	/* T/F: extrablk is after new */
 	xfs_da_state_blk_t	extrablk;	/* for double-splits on leafs */