Changes since last update:

- Minor code cleanups.
 - Fix a superblock logging error.
 - Ensure that collapse range converts the data fork to extents format
   when necessary.
 - Revert the ALLOC_USERDATA cleanup because it caused subtle
   behavior regressions.
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Merge tag 'xfs-5.4-merge-8' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull xfs fixes from Darrick Wong:
 "There are a couple of bug fixes and some small code cleanups that came
  in recently:

   - Minor code cleanups

   - Fix a superblock logging error

   - Ensure that collapse range converts the data fork to extents format
     when necessary

   - Revert the ALLOC_USERDATA cleanup because it caused subtle behavior
     regressions"

* tag 'xfs-5.4-merge-8' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: avoid unused to_mp() function warning
  xfs: log proper length of superblock
  xfs: revert 1baa2800e6 ("xfs: remove the unused XFS_ALLOC_USERDATA flag")
  xfs: removed unneeded variable
  xfs: convert inode to extent format after extent merge due to shift

fs/xfs/libxfs/xfs_alloc.h

@@ -81,9 +81,10 @@ typedef struct xfs_alloc_arg {
 /*
  * Defines for datatype
  */
-#define XFS_ALLOC_INITIAL_USER_DATA	(1 << 0)/* special case start of file */
-#define XFS_ALLOC_USERDATA_ZERO		(1 << 1)/* zero extent on allocation */
-#define XFS_ALLOC_NOBUSY		(1 << 2)/* Busy extents not allowed */
+#define XFS_ALLOC_USERDATA		(1 << 0)/* allocation is for user data*/
+#define XFS_ALLOC_INITIAL_USER_DATA	(1 << 1)/* special case start of file */
+#define XFS_ALLOC_USERDATA_ZERO		(1 << 2)/* zero extent on allocation */
+#define XFS_ALLOC_NOBUSY		(1 << 3)/* Busy extents not allowed */
 
 static inline bool
 xfs_alloc_is_userdata(int datatype)

fs/xfs/libxfs/xfs_bmap.c

@@ -4042,8 +4042,12 @@ xfs_bmapi_allocate(
 	 */
 	if (!(bma->flags & XFS_BMAPI_METADATA)) {
 		bma->datatype = XFS_ALLOC_NOBUSY;
-		if (whichfork == XFS_DATA_FORK && bma->offset == 0)
-			bma->datatype |= XFS_ALLOC_INITIAL_USER_DATA;
+		if (whichfork == XFS_DATA_FORK) {
+			if (bma->offset == 0)
+				bma->datatype |= XFS_ALLOC_INITIAL_USER_DATA;
+			else
+				bma->datatype |= XFS_ALLOC_USERDATA;
+		}
 		if (bma->flags & XFS_BMAPI_ZERO)
 			bma->datatype |= XFS_ALLOC_USERDATA_ZERO;
 	}
@@ -5621,6 +5625,11 @@ xfs_bmse_merge(
 	if (error)
 		return error;
 
+	/* change to extent format if required after extent removal */
+	error = xfs_bmap_btree_to_extents(tp, ip, cur, logflags, whichfork);
+	if (error)
+		return error;
+
 done:
 	xfs_iext_remove(ip, icur, 0);
 	xfs_iext_prev(XFS_IFORK_PTR(ip, whichfork), icur);

fs/xfs/libxfs/xfs_sb.c

@@ -928,7 +928,7 @@ xfs_log_sb(
 
 	xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
 	xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
-	xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb));
+	xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1);
 }
 
 /*

fs/xfs/scrub/alloc.c

@@ -97,7 +97,6 @@ xchk_allocbt_rec(
 	xfs_agnumber_t		agno = bs->cur->bc_private.a.agno;
 	xfs_agblock_t		bno;
 	xfs_extlen_t		len;
-	int			error = 0;
 
 	bno = be32_to_cpu(rec->alloc.ar_startblock);
 	len = be32_to_cpu(rec->alloc.ar_blockcount);
@@ -109,7 +108,7 @@ xchk_allocbt_rec(
 
 	xchk_allocbt_xref(bs->sc, bno, len);
 
-	return error;
+	return 0;
 }
 
 /* Scrub the freespace btrees for some AG. */

fs/xfs/xfs_sysfs.c

@@ -63,19 +63,6 @@ static const struct sysfs_ops xfs_sysfs_ops = {
 	.store = xfs_sysfs_object_store,
 };
 
-/*
- * xfs_mount kobject. The mp kobject also serves as the per-mount parent object
- * that is identified by the fsname under sysfs.
- */
-
-static inline struct xfs_mount *
-to_mp(struct kobject *kobject)
-{
-	struct xfs_kobj *kobj = to_kobj(kobject);
-
-	return container_of(kobj, struct xfs_mount, m_kobj);
-}
-
 static struct attribute *xfs_mp_attrs[] = {
 	NULL,
 };