On Mon, 05 Aug 2024 22:12:41 +0200, Jan Kara wrote:
> When the filesystem is mounted with errors=remount-ro, we were setting
> SB_RDONLY flag to stop all filesystem modifications. We knew this misses
> proper locking (sb->s_umount) and does not go through proper filesystem
> remount procedure but it has been the way this worked since early ext2
> days and it was good enough for catastrophic situation damage
> mitigation. Recently, syzbot has found a way (see link) to trigger
> warnings in filesystem freezing because the code got confused by
> SB_RDONLY changing under its hands. Since these days we set
> EXT4_FLAGS_SHUTDOWN on the superblock which is enough to stop all
> filesystem modifications, modifying SB_RDONLY shouldn't be needed. So
> stop doing that.
>
> [...]
Applied, thanks!
[1/1] ext4: don't set SB_RDONLY after filesystem errors
commit: d3476f3dad4ad68ae5f6b008ea6591d1520da5d8
Best regards,
--
Theodore Ts'o <tytso@xxxxxxx>
