Implemented the suggested solution mentioned in the bug https://bugzilla.kernel.org/show_bug.cgi?id=218820 Preventing the disabling of delayed allocation mode on remount. delalloc to nodelalloc not permitted anymore nodelalloc to delalloc permitted, not affected Signed-off-by: Nicolas Bretz <bretznic@xxxxxxxxx> --- fs/ext4/super.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 03373471131c..ef22d227802d 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -5875,6 +5875,12 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) ext4_abort(sb, EXT4_ERR_ESHUTDOWN, "Abort forced by user"); + if ((old_opts.s_mount_opt & EXT4_MOUNT_DELALLOC) & ~test_opt(sb, DELALLOC)) { + ext4_msg(sb, KERN_ERR, "can't disable delalloc during remount"); + err = -EINVAL; + goto restore_opts; + } + sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); -- 2.39.5
