On Thu, Sep 14, 2023 at 05:58:05PM +0100, Al Viro wrote: > Incidentally, I'm going to add a (belated by 10 years) chunk in porting.rst > re making sure that anything in superblock that might be needed by methods > called in RCU mode should *not* be freed without an RCU delay... Should've > done that back in 3.12 merge window when RCU'd vfsmounts went in; as it > is, today we have several filesystems with exact same kind of breakage. > hfsplus and affs breakage had been there in 3.13 (missed those two), exfat > and ntfs3 - introduced later, by initial merges of filesystems in question. > Missed on review... > > Hell knows - perhaps Documentation/filesystems/whack-a-mole might be a good > idea... Actually, utf8 casefolding stuff also has the same problem, so ext4 and f2fs with casefolding are also affected ;-/
