On Tue, Apr 02, 2024 at 06:39:03PM -0700, Darrick J. Wong wrote: > On Tue, Apr 02, 2024 at 08:10:15PM -0400, Colin Walters wrote: > > >> I hesitate to say it but maybe there should be some ioctl for online > > >> repair use cases only, or perhaps a new O_NOVERITY special flag to > > >> openat2()? > > > > > > "openat2 but without meddling from the VFS"? Tempting... ;) > > > > Or really any lower level even filesystem-specific API for the online > > fsck case. Adding a blanket new special case for all CAP_SYS_ADMIN > > processes covers a lot of things that don't need that. > > I suppose there could be an O_NOVALIDATION to turn off data checksum > validation on btrfs/bcachefs too. But then you'd want to careful > controls on who gets to use it. Maybe not liblzma_la-crc64-fast.o. Just use XFS_IOC_OPEN_BY_HANDLE same as xfs_fsr and xfsdump do. The handle can be build in userspace from the inode bulkstat information, and for typical inode contents verification purposes we don't actually need path-based open access to the inodes. That would then mean we can simple add our own open flag to return a fd that can do data operations that short-circuit verification... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx
