xfs: Fix xfs_flush_unmap_range() range for RT

Currently xfs_flush_unmap_range() does unmap for a full RT extent range,
which we also want to ensure is clean and idle.

This code change is originally from Dave Chinner.

Reviewed-by: Christoph Hellwig <hch@lst.de>4
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index a4d9fbc21b8343eefe4570b6403d6d1a947190d5..501068eab502153fb5b9a6aa9baf599e318fbf11 100644 (file)
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -808,14 +808,18 @@ xfs_flush_unmap_range(
        xfs_off_t               offset,
        xfs_off_t               len)
 {
-       struct xfs_mount        *mp = ip->i_mount;
        struct inode            *inode = VFS_I(ip);
        xfs_off_t               rounding, start, end;
        int                     error;
 
-       rounding = max_t(xfs_off_t, mp->m_sb.sb_blocksize, PAGE_SIZE);
-       start = round_down(offset, rounding);
-       end = round_up(offset + len, rounding) - 1;
+       /*
+        * Make sure we extend the flush out to extent alignment
+        * boundaries so any extent range overlapping the start/end
+        * of the modification we are about to do is clean and idle.
+        */
+       rounding = max_t(xfs_off_t, xfs_inode_alloc_unitsize(ip), PAGE_SIZE);
+       start = rounddown_64(offset, rounding);
+       end = roundup_64(offset + len, rounding) - 1;
 
        error = filemap_write_and_wait_range(inode->i_mapping, start, end);
        if (error)