[XFS] Add op_flags field and helpers to xfs_da_args

The end of the xfs_da_args structure has 4 unsigned char fields for
true/false information on directory and attr operations using the
xfs_da_args structure.

The following converts these 4 into a op_flags field that uses the first 4
bits for these fields and allows expansion for future operation
information (eg. case-insensitive lookup request).

SGI-PV: 981520
SGI-Modid: xfs-linux-melb:xfs-kern:31206a

Signed-off-by: Barry Naujok <bnaujok@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>

fs/xfs/xfs_attr.c

@@ -241,8 +241,7 @@ xfs_attr_set_int(xfs_inode_t *dp, struct xfs_name *name,
 	args.firstblock = &firstblock;
 	args.flist = &flist;
 	args.whichfork = XFS_ATTR_FORK;
-	args.addname = 1;
-	args.oknoent = 1;
+	args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
 
 	/*
 	 * Determine space new attribute will use, and if it would be
@@ -974,7 +973,7 @@ xfs_attr_leaf_addname(xfs_da_args_t *args)
 			xfs_da_brelse(args->trans, bp);
 			return(retval);
 		}
-		args->rename = 1;			/* an atomic rename */
+		args->op_flags |= XFS_DA_OP_RENAME;	/* an atomic rename */
 		args->blkno2 = args->blkno;		/* set 2nd entry info*/
 		args->index2 = args->index;
 		args->rmtblkno2 = args->rmtblkno;
@@ -1054,7 +1053,7 @@ xfs_attr_leaf_addname(xfs_da_args_t *args)
 	 * so that one disappears and one appears atomically.  Then we
 	 * must remove the "old" attribute/value pair.
 	 */
-	if (args->rename) {
+	if (args->op_flags & XFS_DA_OP_RENAME) {
 		/*
 		 * In a separate transaction, set the incomplete flag on the
 		 * "old" attr and clear the incomplete flag on the "new" attr.
@@ -1307,7 +1306,7 @@ xfs_attr_node_addname(xfs_da_args_t *args)
 	} else if (retval == EEXIST) {
 		if (args->flags & ATTR_CREATE)
 			goto out;
-		args->rename = 1;			/* atomic rename op */
+		args->op_flags |= XFS_DA_OP_RENAME;	/* atomic rename op */
 		args->blkno2 = args->blkno;		/* set 2nd entry info*/
 		args->index2 = args->index;
 		args->rmtblkno2 = args->rmtblkno;
@@ -1425,7 +1424,7 @@ xfs_attr_node_addname(xfs_da_args_t *args)
 	 * so that one disappears and one appears atomically.  Then we
 	 * must remove the "old" attribute/value pair.
 	 */
-	if (args->rename) {
+	if (args->op_flags & XFS_DA_OP_RENAME) {
 		/*
 		 * In a separate transaction, set the incomplete flag on the
 		 * "old" attr and clear the incomplete flag on the "new" attr.

fs/xfs/xfs_attr_leaf.c

@@ -369,9 +369,10 @@ xfs_attr_shortform_remove(xfs_da_args_t *args)
 	 * Fix up the start offset of the attribute fork
 	 */
 	totsize -= size;
-	if (totsize == sizeof(xfs_attr_sf_hdr_t) && !args->addname &&
-	    (mp->m_flags & XFS_MOUNT_ATTR2) && 
-	    (dp->i_d.di_format != XFS_DINODE_FMT_BTREE)) {
+	if (totsize == sizeof(xfs_attr_sf_hdr_t) &&
+				!(args->op_flags & XFS_DA_OP_ADDNAME) &&
+				(mp->m_flags & XFS_MOUNT_ATTR2) &&
+				(dp->i_d.di_format != XFS_DINODE_FMT_BTREE)) {
 		/*
 		 * Last attribute now removed, revert to original
 		 * inode format making all literal area available
@@ -389,9 +390,10 @@ xfs_attr_shortform_remove(xfs_da_args_t *args)
 		xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
 		dp->i_d.di_forkoff = xfs_attr_shortform_bytesfit(dp, totsize);
 		ASSERT(dp->i_d.di_forkoff);
-		ASSERT(totsize > sizeof(xfs_attr_sf_hdr_t) || args->addname ||
-			!(mp->m_flags & XFS_MOUNT_ATTR2) ||
-			dp->i_d.di_format == XFS_DINODE_FMT_BTREE);
+		ASSERT(totsize > sizeof(xfs_attr_sf_hdr_t) ||
+				(args->op_flags & XFS_DA_OP_ADDNAME) ||
+				!(mp->m_flags & XFS_MOUNT_ATTR2) ||
+				dp->i_d.di_format == XFS_DINODE_FMT_BTREE);
 		dp->i_afp->if_ext_max =
 			XFS_IFORK_ASIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
 		dp->i_df.if_ext_max =
@@ -531,7 +533,7 @@ xfs_attr_shortform_to_leaf(xfs_da_args_t *args)
 	nargs.total = args->total;
 	nargs.whichfork = XFS_ATTR_FORK;
 	nargs.trans = args->trans;
-	nargs.oknoent = 1;
+	nargs.op_flags = XFS_DA_OP_OKNOENT;
 
 	sfe = &sf->list[0];
 	for (i = 0; i < sf->hdr.count; i++) {
@@ -853,7 +855,7 @@ xfs_attr_leaf_to_shortform(xfs_dabuf_t *bp, xfs_da_args_t *args, int forkoff)
 	nargs.total = args->total;
 	nargs.whichfork = XFS_ATTR_FORK;
 	nargs.trans = args->trans;
-	nargs.oknoent = 1;
+	nargs.op_flags = XFS_DA_OP_OKNOENT;
 	entry = &leaf->entries[0];
 	for (i = 0; i < be16_to_cpu(leaf->hdr.count); entry++, i++) {
 		if (entry->flags & XFS_ATTR_INCOMPLETE)
@@ -1155,7 +1157,7 @@ xfs_attr_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int mapindex)
 	entry->hashval = cpu_to_be32(args->hashval);
 	entry->flags = tmp ? XFS_ATTR_LOCAL : 0;
 	entry->flags |= XFS_ATTR_NSP_ARGS_TO_ONDISK(args->flags);
-	if (args->rename) {
+	if (args->op_flags & XFS_DA_OP_RENAME) {
 		entry->flags |= XFS_ATTR_INCOMPLETE;
 		if ((args->blkno2 == args->blkno) &&
 		    (args->index2 <= args->index)) {

fs/xfs/xfs_da_btree.c

@@ -1431,7 +1431,7 @@ xfs_da_path_shift(xfs_da_state_t *state, xfs_da_state_path_t *path,
 	}
 	if (level < 0) {
 		*result = XFS_ERROR(ENOENT);	/* we're out of our tree */
-		ASSERT(args->oknoent);
+		ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 		return(0);
 	}
 

fs/xfs/xfs_da_btree.h

@@ -132,13 +132,18 @@ typedef struct xfs_da_args {
 	int		index2;		/* index of 2nd attr in blk */
 	xfs_dablk_t	rmtblkno2;	/* remote attr value starting blkno */
 	int		rmtblkcnt2;	/* remote attr value block count */
-	unsigned char	justcheck;	/* T/F: check for ok with no space */
-	unsigned char	rename;		/* T/F: this is an atomic rename op */
-	unsigned char	addname;	/* T/F: this is an add operation */
-	unsigned char	oknoent;	/* T/F: ok to return ENOENT, else die */
+	int		op_flags;	/* operation flags */
 	enum xfs_dacmp	cmpresult;	/* name compare result for lookups */
 } xfs_da_args_t;
 
+/*
+ * Operation flags:
+ */
+#define XFS_DA_OP_JUSTCHECK	0x0001	/* check for ok with no space */
+#define XFS_DA_OP_RENAME	0x0002	/* this is an atomic rename op */
+#define XFS_DA_OP_ADDNAME	0x0004	/* this is an add operation */
+#define XFS_DA_OP_OKNOENT	0x0008	/* lookup/add op, ENOENT ok, else die */
+
 /*
  * Structure to describe buffer(s) for a block.
  * This is needed in the directory version 2 format case, when

fs/xfs/xfs_dir2.c

@@ -46,6 +46,8 @@
 
 struct xfs_name xfs_name_dotdot = {"..", 2};
 
+extern const struct xfs_nameops xfs_default_nameops;
+
 void
 xfs_dir_mount(
 	xfs_mount_t	*mp)
@@ -173,8 +175,7 @@ xfs_dir_createname(
 	args.total = total;
 	args.whichfork = XFS_DATA_FORK;
 	args.trans = tp;
-	args.justcheck = 0;
-	args.addname = args.oknoent = 1;
+	args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
 
 	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 		rval = xfs_dir2_sf_addname(&args);
@@ -215,7 +216,7 @@ xfs_dir_lookup(
 	args.dp = dp;
 	args.whichfork = XFS_DATA_FORK;
 	args.trans = tp;
-	args.oknoent = 1;
+	args.op_flags = XFS_DA_OP_OKNOENT;
 	args.cmpresult = XFS_CMP_DIFFERENT;
 
 	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
@@ -267,7 +268,7 @@ xfs_dir_removename(
 	args.total = total;
 	args.whichfork = XFS_DATA_FORK;
 	args.trans = tp;
-	args.justcheck = args.addname = args.oknoent = 0;
+	args.op_flags = 0;
 
 	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 		rval = xfs_dir2_sf_removename(&args);
@@ -350,7 +351,7 @@ xfs_dir_replace(
 	args.total = total;
 	args.whichfork = XFS_DATA_FORK;
 	args.trans = tp;
-	args.justcheck = args.addname = args.oknoent = 0;
+	args.op_flags = 0;
 
 	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 		rval = xfs_dir2_sf_replace(&args);
@@ -394,7 +395,8 @@ xfs_dir_canenter(
 	args.dp = dp;
 	args.whichfork = XFS_DATA_FORK;
 	args.trans = tp;
-	args.justcheck = args.addname = args.oknoent = 1;
+	args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
+							XFS_DA_OP_OKNOENT;
 
 	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 		rval = xfs_dir2_sf_addname(&args);

fs/xfs/xfs_dir2_block.c

@@ -215,7 +215,7 @@ xfs_dir2_block_addname(
 	/*
 	 * If this isn't a real add, we're done with the buffer.
 	 */
-	if (args->justcheck)
+	if (args->op_flags & XFS_DA_OP_JUSTCHECK)
 		xfs_da_brelse(tp, bp);
 	/*
 	 * If we don't have space for the new entry & leaf ...
@@ -225,7 +225,7 @@ xfs_dir2_block_addname(
 		 * Not trying to actually do anything, or don't have
 		 * a space reservation: return no-space.
 		 */
-		if (args->justcheck || args->total == 0)
+		if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
 			return XFS_ERROR(ENOSPC);
 		/*
 		 * Convert to the next larger format.
@@ -240,7 +240,7 @@ xfs_dir2_block_addname(
 	/*
 	 * Just checking, and it would work, so say so.
 	 */
-	if (args->justcheck)
+	if (args->op_flags & XFS_DA_OP_JUSTCHECK)
 		return 0;
 	needlog = needscan = 0;
 	/*
@@ -674,7 +674,7 @@ xfs_dir2_block_lookup_int(
 		else
 			high = mid - 1;
 		if (low > high) {
-			ASSERT(args->oknoent);
+			ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 			xfs_da_brelse(tp, bp);
 			return XFS_ERROR(ENOENT);
 		}
@@ -713,7 +713,7 @@ xfs_dir2_block_lookup_int(
 	} while (++mid < be32_to_cpu(btp->count) &&
 			be32_to_cpu(blp[mid].hashval) == hash);
 
-	ASSERT(args->oknoent);
+	ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 	/*
 	 * Here, we can only be doing a lookup (not a rename or replace).
 	 * If a case-insensitive match was found earlier, return success.

fs/xfs/xfs_dir2_leaf.c

@@ -263,20 +263,21 @@ xfs_dir2_leaf_addname(
 	 * If we don't have enough free bytes but we can make enough
 	 * by compacting out stale entries, we'll do that.
 	 */
-	if ((char *)bestsp - (char *)&leaf->ents[be16_to_cpu(leaf->hdr.count)] < needbytes &&
-	    be16_to_cpu(leaf->hdr.stale) > 1) {
+	if ((char *)bestsp - (char *)&leaf->ents[be16_to_cpu(leaf->hdr.count)] <
+				needbytes && be16_to_cpu(leaf->hdr.stale) > 1) {
 		compact = 1;
 	}
 	/*
 	 * Otherwise if we don't have enough free bytes we need to
 	 * convert to node form.
 	 */
-	else if ((char *)bestsp - (char *)&leaf->ents[be16_to_cpu(leaf->hdr.count)] <
-		 needbytes) {
+	else if ((char *)bestsp - (char *)&leaf->ents[be16_to_cpu(
+						leaf->hdr.count)] < needbytes) {
 		/*
 		 * Just checking or no space reservation, give up.
 		 */
-		if (args->justcheck || args->total == 0) {
+		if ((args->op_flags & XFS_DA_OP_JUSTCHECK) ||
+							args->total == 0) {
 			xfs_da_brelse(tp, lbp);
 			return XFS_ERROR(ENOSPC);
 		}
@@ -301,7 +302,7 @@ xfs_dir2_leaf_addname(
 	 * If just checking, then it will fit unless we needed to allocate
 	 * a new data block.
 	 */
-	if (args->justcheck) {
+	if (args->op_flags & XFS_DA_OP_JUSTCHECK) {
 		xfs_da_brelse(tp, lbp);
 		return use_block == -1 ? XFS_ERROR(ENOSPC) : 0;
 	}
@@ -1414,7 +1415,7 @@ xfs_dir2_leaf_lookup_int(
 			cbp = dbp;
 		}
 	}
-	ASSERT(args->oknoent);
+	ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 	/*
 	 * Here, we can only be doing a lookup (not a rename or replace).
 	 * If a case-insensitive match was found earlier, release the current

fs/xfs/xfs_dir2_node.c

@@ -226,7 +226,7 @@ xfs_dir2_leafn_add(
 	ASSERT(index == be16_to_cpu(leaf->hdr.count) ||
 	       be32_to_cpu(leaf->ents[index].hashval) >= args->hashval);
 
-	if (args->justcheck)
+	if (args->op_flags & XFS_DA_OP_JUSTCHECK)
 		return 0;
 
 	/*
@@ -515,7 +515,7 @@ xfs_dir2_leafn_lookup_for_addname(
 	/* Didn't find any space */
 	fi = -1;
 out:
-	ASSERT(args->oknoent);
+	ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 	if (curbp) {
 		/* Giving back a free block. */
 		state->extravalid = 1;
@@ -638,7 +638,8 @@ xfs_dir2_leafn_lookup_for_entry(
 	/* Didn't find an exact match. */
 	error = ENOENT;
 	di = -1;
-	ASSERT(index == be16_to_cpu(leaf->hdr.count) || args->oknoent);
+	ASSERT(index == be16_to_cpu(leaf->hdr.count) ||
+					(args->op_flags & XFS_DA_OP_OKNOENT));
 out:
 	if (curbp) {
 		/* Giving back a data block. */
@@ -669,7 +670,7 @@ xfs_dir2_leafn_lookup_int(
 	int			*indexp,	/* out: leaf entry index */
 	xfs_da_state_t		*state)		/* state to fill in */
 {
-	if (args->addname)
+	if (args->op_flags & XFS_DA_OP_ADDNAME)
 		return xfs_dir2_leafn_lookup_for_addname(bp, args, indexp,
 							state);
 	return xfs_dir2_leafn_lookup_for_entry(bp, args, indexp, state);
@@ -1383,7 +1384,7 @@ xfs_dir2_node_addname(
 		/*
 		 * It worked, fix the hash values up the btree.
 		 */
-		if (!args->justcheck)
+		if (!(args->op_flags & XFS_DA_OP_JUSTCHECK))
 			xfs_da_fixhashpath(state, &state->path);
 	} else {
 		/*
@@ -1566,7 +1567,8 @@ xfs_dir2_node_addname_int(
 		/*
 		 * Not allowed to allocate, return failure.
 		 */
-		if (args->justcheck || args->total == 0) {
+		if ((args->op_flags & XFS_DA_OP_JUSTCHECK) ||
+							args->total == 0) {
 			/*
 			 * Drop the freespace buffer unless it came from our
 			 * caller.
@@ -1712,7 +1714,7 @@ xfs_dir2_node_addname_int(
 		/*
 		 * If just checking, we succeeded.
 		 */
-		if (args->justcheck) {
+		if (args->op_flags & XFS_DA_OP_JUSTCHECK) {
 			if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL)
 				xfs_da_buf_done(fbp);
 			return 0;

fs/xfs/xfs_dir2_sf.c

@@ -332,7 +332,7 @@ xfs_dir2_sf_addname(
 		/*
 		 * Just checking or no space reservation, it doesn't fit.
 		 */
-		if (args->justcheck || args->total == 0)
+		if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
 			return XFS_ERROR(ENOSPC);
 		/*
 		 * Convert to block form then add the name.
@@ -345,7 +345,7 @@ xfs_dir2_sf_addname(
 	/*
 	 * Just checking, it fits.
 	 */
-	if (args->justcheck)
+	if (args->op_flags & XFS_DA_OP_JUSTCHECK)
 		return 0;
 	/*
 	 * Do it the easy way - just add it at the end.
@@ -869,7 +869,7 @@ xfs_dir2_sf_lookup(
 				return XFS_ERROR(EEXIST);
 		}
 	}
-	ASSERT(args->oknoent);
+	ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 	/*
 	 * Here, we can only be doing a lookup (not a rename or replace).
 	 * If a case-insensitive match was found earlier, return "found".
@@ -1071,7 +1071,7 @@ xfs_dir2_sf_replace(
 		 * Didn't find it.
 		 */
 		if (i == sfp->hdr.count) {
-			ASSERT(args->oknoent);
+			ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 #if XFS_BIG_INUMS
 			if (i8elevated)
 				xfs_dir2_sf_toino4(args);