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block: Use bdrv_filter_(bs|child) where obvious

Browse source 
Places that use patterns like

    if (bs->drv->is_filter && bs->file) {
        ... something about bs->file->bs ...
    }

should be

    BlockDriverState *filtered = bdrv_filter_bs(bs);
    if (filtered) {
        ... something about @filtered ...
    }

instead.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2019-06-12 17:03:38 +02:00 • committed by Kevin Wolf
parent 4935e8be22
commit 93393e698c
3 changed files with 26 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

7
block/io.c
View file

@ -3309,6 +3309,7 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact,
Error **errp)
{
BlockDriverState *bs = child->bs;
BdrvChild *filtered;
BlockDriver *drv = bs->drv;
BdrvTrackedRequest req;
int64_t old_size, new_bytes;
@ -3360,6 +3361,8 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact,
goto out;
}
filtered = bdrv_filter_child(bs);
/*
* If the image has a backing file that is large enough that it would
* provide data for the new area, we cannot leave it unallocated because
@ -3392,8 +3395,8 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact,
goto out;
}
ret = drv->bdrv_co_truncate(bs, offset, exact, prealloc, flags, errp);
} else if (bs->file && drv->is_filter) {
ret = bdrv_co_truncate(bs->file, offset, exact, prealloc, flags, errp);
} else if (filtered) {
ret = bdrv_co_truncate(filtered, offset, exact, prealloc, flags, errp);
} else {
error_setg(errp, "Image format driver does not support resize");
ret = -ENOTSUP;