[PATCH v7 4/4] xfs: xfs_seek_hole() refinement with hole searching from page cache for unwritten extent

Improve xfs_seek_hole() to search hole offset from page cache for unwritten extents.

Signed-off-by: Jie Liu <jeff.liu <at> oracle.com>
---
 fs/xfs/xfs_file.c |   76 +++++++++++++++++++++++++++++++++++++++++++++-------
 1 files changed, 65 insertions(+), 11 deletions(-)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 43b3718..a537f61 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
 <at>  <at>  -1288,9 +1288,9  <at>  <at>  xfs_seek_hole(
 	struct xfs_inode	*ip = XFS_I(inode);
 	struct xfs_mount	*mp = ip->i_mount;
 	loff_t			uninitialized_var(offset);
-	loff_t			holeoff;
 	xfs_fsize_t		isize;
 	xfs_fileoff_t		fsbno;
+	xfs_filblks_t		end;
 	uint			lock;
 	int			error;

 <at>  <at>  -1306,21 +1306,75  <at>  <at>  xfs_seek_hole(
 	}

 	fsbno = XFS_B_TO_FSBT(mp, start);
-	error = xfs_bmap_first_unused(NULL, ip, 1, &fsbno, XFS_DATA_FORK);
-	if (error)
-		goto out_unlock;
+	end = XFS_B_TO_FSB(mp, isize);