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block: Handle filter truncation like native impl. 

Make the filter truncation (passing it through to bs->file) a
first-class citizen and handle it exactly as if it was the filter
driver's native implementation of .bdrv_co_truncate().

I do not see a reason not to, it makes the code a bit shorter, and may
be even more correct because this gets us to finish the write_req that
we prepared before (may be important to e.g. bring dirty bitmaps to the
correct size).

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190918095144.955-2-mreitz@redhat.com
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2019-09-18 11:51:37 +02:00
parent f53b25dfd5
commit 6b7e8f8b1c
1 changed files with 6 additions and 7 deletions
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13
block/io.c
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@ -3347,20 +3347,19 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset,
goto out;
}
if (!drv->bdrv_co_truncate) {
if (bs->file && drv->is_filter) {
ret = bdrv_co_truncate(bs->file, offset, prealloc, errp);
goto out;
}
if (drv->bdrv_co_truncate) {
ret = drv->bdrv_co_truncate(bs, offset, prealloc, errp);
} else if (bs->file && drv->is_filter) {
ret = bdrv_co_truncate(bs->file, offset, prealloc, errp);
} else {
error_setg(errp, "Image format driver does not support resize");
ret = -ENOTSUP;
goto out;
}
ret = drv->bdrv_co_truncate(bs, offset, prealloc, errp);
if (ret < 0) {
goto out;
}
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not refresh total sector count");