ext4: enable the lazy init thread when remounting read/write

In commit a44be64bbecb ("ext4: don't clear SB_RDONLY when remounting
r/w until quota is re-enabled") we defer clearing tyhe SB_RDONLY flag
in struct super.  However, we didn't defer when we checked sb_rdonly()
to determine the lazy itable init thread should be enabled, with the
next result that the lazy inode table initialization would not be
properly started.  This can cause generic/231 to fail in ext4's
nojournal mode.

Fix this by moving when we decide to start or stop the lazy itable
init thread to after we clear the SB_RDONLY flag when we are
remounting the file system read/write.

Fixes a44be64bbecb ("ext4: don't clear SB_RDONLY when remounting r/w until...")

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/r/20230527035729.1001605-1-tytso@mit.edu
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 9680fe7..56a5d1c 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -6589,18 +6589,6 @@ static int __ext4_remount(struct fs_context *fc, struct super_block *sb)
        }
 
        /*
-        * Reinitialize lazy itable initialization thread based on
-        * current settings
-        */
-       if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
-               ext4_unregister_li_request(sb);
-       else {
-               ext4_group_t first_not_zeroed;
-               first_not_zeroed = ext4_has_uninit_itable(sb);
-               ext4_register_li_request(sb, first_not_zeroed);
-       }
-
-       /*
         * Handle creation of system zone data early because it can fail.
         * Releasing of existing data is done when we are sure remount will
         * succeed.
@@ -6637,6 +6625,18 @@ static int __ext4_remount(struct fs_context *fc, struct super_block *sb)
        if (enable_rw)
                sb->s_flags &= ~SB_RDONLY;
 
+       /*
+        * Reinitialize lazy itable initialization thread based on
+        * current settings
+        */
+       if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
+               ext4_unregister_li_request(sb);
+       else {
+               ext4_group_t first_not_zeroed;
+               first_not_zeroed = ext4_has_uninit_itable(sb);
+               ext4_register_li_request(sb, first_not_zeroed);
+       }
+
        if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
                ext4_stop_mmpd(sbi);