xfs: update lazy sb counters immediately for resizefs

sb_fdblocks will be updated lazily if lazysbcount is enabled,
therefore when shrinking the filesystem sb_fdblocks could be
larger than sb_dblocks and xfs_validate_sb_write() would fail.

Even for growfs case, it'd be better to update lazy sb counters
immediately to reflect the real sb counters.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index a2a4070..9f9ba8b 100644 (file)
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -128,6 +128,15 @@ xfs_growfs_data_private(
                                 nb - mp->m_sb.sb_dblocks);
        if (id.nfree)
                xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree);
+
+       /*
+        * Sync sb counters now to reflect the updated values. This is
+        * particularly important for shrink because the write verifier
+        * will fail if sb_fdblocks is ever larger than sb_dblocks.
+        */
+       if (xfs_sb_version_haslazysbcount(&mp->m_sb))
+               xfs_log_sb(tp);
+
        xfs_trans_set_sync(tp);
        error = xfs_trans_commit(tp);
        if (error)