Eric Blake fb26337641 nbd: Don't trim unrequested bytes ... Similar to commit df7b97ff, we are mishandling clients that give an unaligned NBD_CMD_TRIM request, and potentially trimming bytes that occur before their request; which in turn can cause potential unintended data loss (unlikely in practice, since most clients are sane and issue aligned trim requests). However, while we fixed read and write by switching to the byte interfaces of blk_, we don't yet have a byte interface for discard. On the other hand, trim is advisory, so rounding the user's request to simply ignore the first and last unaligned sectors (or the entire request, if it is sub-sector in length) is just fine. CC: qemu-stable@nongnu.org Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1464173965-9694-1-git-send-email-eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> (cherry picked from commit 353ab96973) Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>		2016-08-05 13:28:06 -05:00
..
client.c	nbd: Don't fail handshake on NBD_OPT_LIST descriptions	2016-04-15 17:56:56 +02:00
common.c	nbd: do not hang nbd_wr_syncv if outside a coroutine and no available data	2016-04-08 00:07:44 +02:00
Makefile.objs
nbd-internal.h	nbd: Avoid bitrot in TRACE() usage	2016-04-08 00:07:43 +02:00
server.c	nbd: Don't trim unrequested bytes	2016-08-05 13:28:06 -05:00