> -----Original Message----- > From: [email protected] [mailto:linux-kernel- > [email protected]] On Behalf Of Jan Kara > Sent: Wednesday, November 4, 2015 10:14 AM > To: [email protected] > Cc: LKML <[email protected]>; [email protected]; > Christoph Hellwig <[email protected]>; Jan Kara <[email protected]> > Subject: [PATCH] brd: Refuse improperly aligned discard requests > > Currently when improperly aligned discard request is submitted, we just > silently discard more / less data which results in filesystem corruption > in some cases. Refuse such misaligned requests.
I agree discarding more than requested is very bad. If they are routed to SCSI or ATA devices, though, the discard commands (SCSI UNMAP or ATA DATA SET MANAGEMENT/TRIM) are just hints, so there is no guarantee the discard will do anything. Are you finding filesystems that still don't understand that? dm-raid held that mistaken assumption for a long time. --- Robert Elliott, HP Server Storage -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
