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btrfs: log message when rw remount is attempted with unclean tree-log

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commit 10a3a3edc5b89a8cd095bc63495fb1e0f42047d9 upstream.

A remount to a read-write filesystem is not safe when there's tree-log
to be replayed. Files that could be opened until now might be affected
by the changes in the tree-log.

A regular mount is needed to replay the log so the filesystem presents
the consistent view with the pending changes included.

CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Sterba 2020-02-05 17:12:28 +01:00 committed by Greg Kroah-Hartman
parent 2a902b48a0
commit a3eccdff2c
1 changed files with 2 additions and 0 deletions
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2
fs/btrfs/super.c
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@ -1857,6 +1857,8 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
}
if (btrfs_super_log_root(fs_info->super_copy) != 0) {
btrfs_warn(fs_info,
"mount required to replay tree-log, cannot remount read-write");
ret = -EINVAL;
goto restore;
}