[PATCH] xfs: revert 1baa2800e62d ("xfs: remove the unused XFS_ALLOC_USERDATA flag")

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From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

Revert this commit, as it caused periodic regressions in xfs/173 w/
1k blocks[1].

[1] https://lore.kernel.org/lkml/20190919014602.GN15734@shao2-debian/

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 fs/xfs/libxfs/xfs_alloc.h |    7 ++++---
 fs/xfs/libxfs/xfs_bmap.c  |    8 ++++++--
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_alloc.h b/fs/xfs/libxfs/xfs_alloc.h
index 58fa85cec325..d6ed5d2c07c2 100644
--- a/fs/xfs/libxfs/xfs_alloc.h
+++ b/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)
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index eaf2d4250a26..4edc25a2ba80 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/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;
 	}



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