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block: check for RESIZE blocker in the QMP command, not bdrv_truncate() 

If we check for the RESIZE blocker in bdrv_truncate(), that means a
commit will fail if the overlay layer is larger than the base, due to
the backing blocker.

This is a regression in behavior from 2.0; currently, commit will try to
grow the size of the base image to match the overlay size, if the
overlay size is larger.

By moving this into the QMP command qmp_block_resize(), it allows
usage of bdrv_truncate() within block jobs.

Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Jeff Cody 2014-06-25 16:55:30 -04:00 committed by Kevin Wolf
parent a760715095
commit 9c75e168bc
2 changed files with 6 additions and 3 deletions
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4
block.c
View File

@ -3483,9 +3483,7 @@ int bdrv_truncate(BlockDriverState *bs, int64_t offset)
return -ENOTSUP;
if (bs->read_only)
return -EACCES;
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
return -EBUSY;
}
ret = drv->bdrv_truncate(bs, offset);
if (ret == 0) {
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);

5
blockdev.c
View File

@ -1819,6 +1819,11 @@ void qmp_block_resize(bool has_device, const char *device,
return;
}
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
error_set(errp, QERR_DEVICE_IN_USE, device);
return;
}
/* complete all in-flight operations before resizing the device */
bdrv_drain_all();