xfs: split xfs_imap_to_bp

Split looking up the dinode from xfs_imap_to_bp, which can be
significantly simplified as a result.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

fs/xfs/libxfs/xfs_inode_buf.c

@@ -124,37 +124,18 @@ const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
 /*
  * This routine is called to map an inode to the buffer containing the on-disk
  * version of the inode.  It returns a pointer to the buffer containing the
- * on-disk inode in the bpp parameter, and in the dipp parameter it returns a
+ * on-disk inode in the bpp parameter.
- * pointer to the on-disk inode within that buffer.
- *
- * If a non-zero error is returned, then the contents of bpp and dipp are
- * undefined.
  */
 int
 xfs_imap_to_bp(
 	struct xfs_mount	*mp,
 	struct xfs_trans	*tp,
 	struct xfs_imap		*imap,
-	struct xfs_dinode       **dipp,
+	struct xfs_buf		**bpp)
-	struct xfs_buf		**bpp,
-	uint			buf_flags)
 {
-	struct xfs_buf		*bp;
+	return xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
-	int			error;
+				   imap->im_len, XBF_UNMAPPED, bpp,
-
-	buf_flags |= XBF_UNMAPPED;
-	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
-				   (int)imap->im_len, buf_flags, &bp,
 				   &xfs_inode_buf_ops);
-	if (error) {
-		ASSERT(error != -EAGAIN || (buf_flags & XBF_TRYLOCK));
-		return error;
-	}
-
-	*bpp = bp;
-	if (dipp)
-		*dipp = xfs_buf_offset(bp, imap->im_boffset);
-	return 0;
 }
 
 static inline struct timespec64 xfs_inode_decode_bigtime(uint64_t ts)

fs/xfs/libxfs/xfs_inode_buf.h

@@ -47,9 +47,8 @@ struct xfs_imap {
 	unsigned short	im_boffset;	/* inode offset in block in bytes */
 };
 
-int	xfs_imap_to_bp(struct xfs_mount *, struct xfs_trans *,
+int	xfs_imap_to_bp(struct xfs_mount *mp, struct xfs_trans *tp,
-		       struct xfs_imap *, struct xfs_dinode **,
+		       struct xfs_imap *imap, struct xfs_buf **bpp);
-		       struct xfs_buf **, uint);
 void	xfs_dinode_calc_crc(struct xfs_mount *, struct xfs_dinode *);
 void	xfs_inode_to_disk(struct xfs_inode *ip, struct xfs_dinode *to,
 			  xfs_lsn_t lsn);

fs/xfs/libxfs/xfs_trans_inode.c

@@ -164,8 +164,7 @@ xfs_trans_log_inode(
 		 * here.
 		 */
 		spin_unlock(&iip->ili_lock);
-		error = xfs_imap_to_bp(ip->i_mount, tp, &ip->i_imap, NULL,
+		error = xfs_imap_to_bp(ip->i_mount, tp, &ip->i_imap, &bp);
-					&bp, 0);
 		if (error) {
 			xfs_force_shutdown(ip->i_mount, SHUTDOWN_META_IO_ERROR);
 			return;

fs/xfs/scrub/ialloc.c

@@ -212,7 +212,6 @@ xchk_iallocbt_check_cluster(
 {
 	struct xfs_imap			imap;
 	struct xfs_mount		*mp = bs->cur->bc_mp;
-	struct xfs_dinode		*dip;
 	struct xfs_buf			*cluster_bp;
 	unsigned int			nr_inodes;
 	xfs_agnumber_t			agno = bs->cur->bc_ag.agno;
@@ -278,7 +277,7 @@ xchk_iallocbt_check_cluster(
 			&XFS_RMAP_OINFO_INODES);
 
 	/* Grab the inode cluster buffer. */
-	error = xfs_imap_to_bp(mp, bs->cur->bc_tp, &imap, &dip, &cluster_bp, 0);
+	error = xfs_imap_to_bp(mp, bs->cur->bc_tp, &imap, &cluster_bp);
 	if (!xchk_btree_xref_process_error(bs->sc, bs->cur, 0, &error))
 		return error;
 

fs/xfs/xfs_icache.c

@@ -505,14 +505,14 @@ xfs_iget_cache_miss(
 	    (flags & XFS_IGET_CREATE) && !(mp->m_flags & XFS_MOUNT_IKEEP)) {
 		VFS_I(ip)->i_generation = prandom_u32();
 	} else {
-		struct xfs_dinode	*dip;
 		struct xfs_buf		*bp;
 
-		error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0);
+		error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &bp);
 		if (error)
 			goto out_destroy;
 
-		error = xfs_inode_from_disk(ip, dip);
+		error = xfs_inode_from_disk(ip,
+				xfs_buf_offset(bp, ip->i_imap.im_boffset));
 		if (!error)
 			xfs_buf_set_ref(bp, XFS_INO_REF);
 		xfs_trans_brelse(tp, bp);

fs/xfs/xfs_inode.c

@@ -2075,9 +2075,10 @@ xfs_iunlink_update_inode(
 
 	ASSERT(xfs_verify_agino_or_null(mp, agno, next_agino));
 
-	error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp, 0);
+	error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &ibp);
 	if (error)
 		return error;
+	dip = xfs_buf_offset(ibp, ip->i_imap.im_boffset);
 
 	/* Make sure the old pointer isn't garbage. */
 	old_value = be32_to_cpu(dip->di_next_unlinked);
@@ -2202,13 +2203,14 @@ xfs_iunlink_map_ino(
 		return error;
 	}
 
-	error = xfs_imap_to_bp(mp, tp, imap, dipp, bpp, 0);
+	error = xfs_imap_to_bp(mp, tp, imap, bpp);
 	if (error) {
 		xfs_warn(mp, "%s: xfs_imap_to_bp returned error %d.",
 				__func__, error);
 		return error;
 	}
 
+	*dipp = xfs_buf_offset(*bpp, imap->im_boffset);
 	return 0;
 }
 

fs/xfs/xfs_log_recover.c

@@ -2683,9 +2683,10 @@ xlog_recover_process_one_iunlink(
 	/*
 	 * Get the on disk inode to find the next inode in the bucket.
 	 */
-	error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &dip, &ibp, 0);
+	error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &ibp);
 	if (error)
 		goto fail_iput;
+	dip = xfs_buf_offset(ibp, ip->i_imap.im_boffset);
 
 	xfs_iflags_clear(ip, XFS_IRECOVERY);
 	ASSERT(VFS_I(ip)->i_nlink == 0);