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qed: refuse unaligned zero writes with a backing file

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Zero writes have cluster granularity in QED.  Therefore they can only be
used to zero entire clusters.

If the zero write request leaves sectors untouched, zeroing the entire
cluster would obscure the backing file.  Instead return -ENOTSUP, which
is handled by block.c:bdrv_co_do_write_zeroes() and falls back to a
regular write.

The qemu-iotests 034 test cases covers this scenario.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2012-08-28 14:04:27 +01:00 committed by Kevin Wolf
parent 18fec301cd
commit ef72f76e58
1 changed files with 11 additions and 0 deletions
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11
block/qed.c
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@ -1363,10 +1363,21 @@ static int coroutine_fn bdrv_qed_co_write_zeroes(BlockDriverState *bs,
int nb_sectors)
{
BlockDriverAIOCB *blockacb;
BDRVQEDState *s = bs->opaque;
QEDWriteZeroesCB cb = { .done = false };
QEMUIOVector qiov;
struct iovec iov;
/* Refuse if there are untouched backing file sectors */
if (bs->backing_hd) {
if (qed_offset_into_cluster(s, sector_num * BDRV_SECTOR_SIZE) != 0) {
return -ENOTSUP;
}
if (qed_offset_into_cluster(s, nb_sectors * BDRV_SECTOR_SIZE) != 0) {
return -ENOTSUP;
}
}
/* Zero writes start without an I/O buffer. If a buffer becomes necessary
* then it will be allocated during request processing.
*/