xfs: devirtualize ->data_entry_tag_p

Replace the ->data_entry_tag_p dir ops method with a directly called
xfs_dir2_data_entry_tag_p helper that takes care of the differences
between the directory format with and without the file type field.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>

fs/xfs/libxfs/xfs_da_format.c

@@ -89,25 +89,6 @@ xfs_dir3_data_put_ftype(
 	dep->name[dep->namelen] = type;
 }
 
-/*
- * Pointer to an entry's tag word.
- */
-static __be16 *
-xfs_dir2_data_entry_tag_p(
-	struct xfs_dir2_data_entry *dep)
-{
-	return (__be16 *)((char *)dep +
-		XFS_DIR2_DATA_ENTSIZE(dep->namelen) - sizeof(__be16));
-}
-
-static __be16 *
-xfs_dir3_data_entry_tag_p(
-	struct xfs_dir2_data_entry *dep)
-{
-	return (__be16 *)((char *)dep +
-		XFS_DIR3_DATA_ENTSIZE(dep->namelen) - sizeof(__be16));
-}
-
 static struct xfs_dir2_data_free *
 xfs_dir2_data_bestfree_p(struct xfs_dir2_data_hdr *hdr)
 {
@@ -123,7 +104,6 @@ xfs_dir3_data_bestfree_p(struct xfs_dir2_data_hdr *hdr)
 static const struct xfs_dir_ops xfs_dir2_ops = {
 	.data_get_ftype = xfs_dir2_data_get_ftype,
 	.data_put_ftype = xfs_dir2_data_put_ftype,
-	.data_entry_tag_p = xfs_dir2_data_entry_tag_p,
 	.data_bestfree_p = xfs_dir2_data_bestfree_p,
 
 	.data_first_offset =  sizeof(struct xfs_dir2_data_hdr) +
@@ -135,7 +115,6 @@ static const struct xfs_dir_ops xfs_dir2_ops = {
 static const struct xfs_dir_ops xfs_dir2_ftype_ops = {
 	.data_get_ftype = xfs_dir3_data_get_ftype,
 	.data_put_ftype = xfs_dir3_data_put_ftype,
-	.data_entry_tag_p = xfs_dir3_data_entry_tag_p,
 	.data_bestfree_p = xfs_dir2_data_bestfree_p,
 
 	.data_first_offset =  sizeof(struct xfs_dir2_data_hdr) +
@@ -147,7 +126,6 @@ static const struct xfs_dir_ops xfs_dir2_ftype_ops = {
 static const struct xfs_dir_ops xfs_dir3_ops = {
 	.data_get_ftype = xfs_dir3_data_get_ftype,
 	.data_put_ftype = xfs_dir3_data_put_ftype,
-	.data_entry_tag_p = xfs_dir3_data_entry_tag_p,
 	.data_bestfree_p = xfs_dir3_data_bestfree_p,
 
 	.data_first_offset =  sizeof(struct xfs_dir3_data_hdr) +

fs/xfs/libxfs/xfs_dir2.h

@@ -35,7 +35,6 @@ struct xfs_dir_ops {
 	uint8_t (*data_get_ftype)(struct xfs_dir2_data_entry *dep);
 	void	(*data_put_ftype)(struct xfs_dir2_data_entry *dep,
 				uint8_t ftype);
-	__be16 * (*data_entry_tag_p)(struct xfs_dir2_data_entry *dep);
 	struct xfs_dir2_data_free *
 		(*data_bestfree_p)(struct xfs_dir2_data_hdr *hdr);
 

fs/xfs/libxfs/xfs_dir2_block.c

@@ -542,7 +542,7 @@ xfs_dir2_block_addname(
 	dep->namelen = args->namelen;
 	memcpy(dep->name, args->name, args->namelen);
 	dp->d_ops->data_put_ftype(dep, args->filetype);
-	tagp = dp->d_ops->data_entry_tag_p(dep);
+	tagp = xfs_dir2_data_entry_tag_p(dp->i_mount, dep);
 	*tagp = cpu_to_be16((char *)dep - (char *)hdr);
 	/*
 	 * Clean up the bestfree array and log the header, tail, and entry.
@@ -1145,7 +1145,7 @@ xfs_dir2_sf_to_block(
 	dep->namelen = 1;
 	dep->name[0] = '.';
 	dp->d_ops->data_put_ftype(dep, XFS_DIR3_FT_DIR);
-	tagp = dp->d_ops->data_entry_tag_p(dep);
+	tagp = xfs_dir2_data_entry_tag_p(mp, dep);
 	*tagp = cpu_to_be16(offset);
 	xfs_dir2_data_log_entry(args, bp, dep);
 	blp[0].hashval = cpu_to_be32(xfs_dir_hash_dot);
@@ -1160,7 +1160,7 @@ xfs_dir2_sf_to_block(
 	dep->namelen = 2;
 	dep->name[0] = dep->name[1] = '.';
 	dp->d_ops->data_put_ftype(dep, XFS_DIR3_FT_DIR);
-	tagp = dp->d_ops->data_entry_tag_p(dep);
+	tagp = xfs_dir2_data_entry_tag_p(mp, dep);
 	*tagp = cpu_to_be16(offset);
 	xfs_dir2_data_log_entry(args, bp, dep);
 	blp[1].hashval = cpu_to_be32(xfs_dir_hash_dotdot);
@@ -1211,7 +1211,7 @@ xfs_dir2_sf_to_block(
 		dep->namelen = sfep->namelen;
 		dp->d_ops->data_put_ftype(dep, xfs_dir2_sf_get_ftype(mp, sfep));
 		memcpy(dep->name, sfep->name, dep->namelen);
-		tagp = dp->d_ops->data_entry_tag_p(dep);
+		tagp = xfs_dir2_data_entry_tag_p(mp, dep);
 		*tagp = cpu_to_be16(newoffset);
 		xfs_dir2_data_log_entry(args, bp, dep);
 		name.name = sfep->name;

fs/xfs/libxfs/xfs_dir2_data.c

@@ -18,12 +18,25 @@
 #include "xfs_trans.h"
 #include "xfs_buf_item.h"
 #include "xfs_log.h"
+#include "xfs_dir2_priv.h"
 
 static xfs_failaddr_t xfs_dir2_data_freefind_verify(
 		struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
 		struct xfs_dir2_data_unused *dup,
 		struct xfs_dir2_data_free **bf_ent);
 
+/*
+ * Pointer to an entry's tag word.
+ */
+__be16 *
+xfs_dir2_data_entry_tag_p(
+	struct xfs_mount		*mp,
+	struct xfs_dir2_data_entry	*dep)
+{
+	return (__be16 *)((char *)dep +
+		xfs_dir2_data_entsize(mp, dep->namelen) - sizeof(__be16));
+}
+
 /*
  * The number of leaf entries is limited by the size of the block and the amount
  * of space used by the data entries.  We don't know how much space is used by
@@ -182,7 +195,7 @@ __xfs_dir3_data_check(
 			return __this_address;
 		if (offset + xfs_dir2_data_entsize(mp, dep->namelen) > end)
 			return __this_address;
-		if (be16_to_cpu(*ops->data_entry_tag_p(dep)) != offset)
+		if (be16_to_cpu(*xfs_dir2_data_entry_tag_p(mp, dep)) != offset)
 			return __this_address;
 		if (ops->data_get_ftype(dep) >= XFS_DIR3_FT_MAX)
 			return __this_address;
@@ -608,7 +621,8 @@ xfs_dir2_data_freescan_int(
 		/*
 		 * For active entries, check their tags and skip them.
 		 */
-		ASSERT(offset == be16_to_cpu(*ops->data_entry_tag_p(dep)));
+		ASSERT(offset ==
+		       be16_to_cpu(*xfs_dir2_data_entry_tag_p(mp, dep)));
 		offset += xfs_dir2_data_entsize(mp, dep->namelen);
 	}
 }
@@ -703,6 +717,7 @@ xfs_dir2_data_log_entry(
 	struct xfs_buf		*bp,
 	xfs_dir2_data_entry_t	*dep)		/* data entry pointer */
 {
+	struct xfs_mount	*mp = bp->b_mount;
 	struct xfs_dir2_data_hdr *hdr = bp->b_addr;
 
 	ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
@@ -711,7 +726,7 @@ xfs_dir2_data_log_entry(
 	       hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
 
 	xfs_trans_log_buf(args->trans, bp, (uint)((char *)dep - (char *)hdr),
-		(uint)((char *)(args->dp->d_ops->data_entry_tag_p(dep) + 1) -
+		(uint)((char *)(xfs_dir2_data_entry_tag_p(mp, dep) + 1) -
 		       (char *)hdr - 1));
 }
 

fs/xfs/libxfs/xfs_dir2_leaf.c

@@ -866,7 +866,7 @@ xfs_dir2_leaf_addname(
 	dep->namelen = args->namelen;
 	memcpy(dep->name, args->name, dep->namelen);
 	dp->d_ops->data_put_ftype(dep, args->filetype);
-	tagp = dp->d_ops->data_entry_tag_p(dep);
+	tagp = xfs_dir2_data_entry_tag_p(dp->i_mount, dep);
 	*tagp = cpu_to_be16((char *)dep - (char *)hdr);
 	/*
 	 * Need to scan fix up the bestfree table.

fs/xfs/libxfs/xfs_dir2_node.c

@@ -1972,7 +1972,7 @@ xfs_dir2_node_addname_int(
 	dep->namelen = args->namelen;
 	memcpy(dep->name, args->name, dep->namelen);
 	dp->d_ops->data_put_ftype(dep, args->filetype);
-	tagp = dp->d_ops->data_entry_tag_p(dep);
+	tagp = xfs_dir2_data_entry_tag_p(dp->i_mount, dep);
 	*tagp = cpu_to_be16((char *)dep - (char *)hdr);
 	xfs_dir2_data_log_entry(args, dbp, dep);
 

fs/xfs/libxfs/xfs_dir2_priv.h

@@ -58,6 +58,8 @@ extern int xfs_dir2_leaf_to_block(struct xfs_da_args *args,
 
 /* xfs_dir2_data.c */
 int xfs_dir2_data_entsize(struct xfs_mount *mp, int n);
+__be16 *xfs_dir2_data_entry_tag_p(struct xfs_mount *mp,
+		struct xfs_dir2_data_entry *dep);
 
 #ifdef DEBUG
 extern void xfs_dir3_data_check(struct xfs_inode *dp, struct xfs_buf *bp);

fs/xfs/scrub/dir.c

@@ -271,7 +271,7 @@ xchk_dir_rec(
 	/* Retrieve the entry, sanity check it, and compare hashes. */
 	ino = be64_to_cpu(dent->inumber);
 	hash = be32_to_cpu(ent->hashval);
-	tag = be16_to_cpup(dp->d_ops->data_entry_tag_p(dent));
+	tag = be16_to_cpup(xfs_dir2_data_entry_tag_p(mp, dent));
 	if (!xfs_verify_dir_ino(mp, ino) || tag != off)
 		xchk_fblock_set_corrupt(ds->sc, XFS_DATA_FORK, rec_bno);
 	if (dent->namelen == 0) {