97a2ae3453
The code is similar to the implementation of discard and write_zeroes with UNMAP. However, failure must be propagated up to block.c. The stale page cache problem can be reproduced as follows: # modprobe scsi-debug lbpws=1 lbprz=1 # ./qemu-io /dev/sdXX qemu-io> write -P 0xcc 0 2M qemu-io> write -z 0 1M qemu-io> read -P 0x00 0 512 Pattern verification failed at offset 0, 512 bytes qemu-io> read -v 0 512 00000000: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................ ... # ./qemu-io --cache=none /dev/sdXX qemu-io> write -P 0xcc 0 2M qemu-io> write -z 0 1M qemu-io> read -P 0x00 0 512 qemu-io> read -v 0 512 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ ... And similarly with discard instead of "write -z". Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> |
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.. | ||
backup.c | ||
blkdebug.c | ||
blkverify.c | ||
bochs.c | ||
cloop.c | ||
commit.c | ||
cow.c | ||
curl.c | ||
dmg.c | ||
gluster.c | ||
iscsi.c | ||
linux-aio.c | ||
Makefile.objs | ||
mirror.c | ||
nbd.c | ||
parallels.c | ||
qapi.c | ||
qcow2-cache.c | ||
qcow2-cluster.c | ||
qcow2-refcount.c | ||
qcow2-snapshot.c | ||
qcow2.c | ||
qcow2.h | ||
qcow.c | ||
qed-check.c | ||
qed-cluster.c | ||
qed-gencb.c | ||
qed-l2-cache.c | ||
qed-table.c | ||
qed.c | ||
qed.h | ||
raw_bsd.c | ||
raw-aio.h | ||
raw-posix.c | ||
raw-win32.c | ||
rbd.c | ||
sheepdog.c | ||
snapshot.c | ||
ssh.c | ||
stream.c | ||
vdi.c | ||
vhdx-endian.c | ||
vhdx-log.c | ||
vhdx.c | ||
vhdx.h | ||
vmdk.c | ||
vpc.c | ||
vvfat.c | ||
win32-aio.c |