[PATCH 0/2] quota: Verify special quota formats match sb type

[Jan Kara <jack@suse.cz>]

Hello,

there are certain quota formats that are created only for particular
filesystems - ocfs2 and tmpfs quota formats in particular. Make sure these
formats are indeed being enabled only for filesystem of appropriate type.
Otherwise quota format operations can easily crash as was spotted by fuzz
testing. The only gripe I have with this solution is the recognition of
filesystem type based on sb->s_type->name looks a bit hacky. Another way to do
this would be to directly compare against e.g. shmem_fs_type but that is a bit
cumbersome since struct file_system_type is generally declared in a relatively
narrow scope (not available where quota ops are implemented) so the filesystem
would need to provide a helper to compare against it. Let me know what people
prefer.

Once reviewed, I can merge these patches through my tree as they are only quota
related and very unlikely to clash with anything.

								Honza