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block: Add PreallocMode to BD.bdrv_truncate()

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Add a PreallocMode parameter to the bdrv_truncate() function implemented
by each block driver. Currently, we always pass PREALLOC_MODE_OFF and no
driver accepts anything else.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170613202107.10125-2-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2017-06-13 22:20:52 +02:00
parent 32a1681adc
commit 8243ccb743
14 changed files with 98 additions and 15 deletions
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9
block/rbd.c
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@ -936,11 +936,18 @@ static int64_t qemu_rbd_getlength(BlockDriverState *bs)
return info.size;
}
static int qemu_rbd_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
static int qemu_rbd_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
BDRVRBDState *s = bs->opaque;
int r;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
r = rbd_resize(s->image, offset);
if (r < 0) {
error_setg_errno(errp, -r, "Failed to resize file");