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block: clean up bdrv_open2 structure a bit 

Check the whitelist as early as possible instead of continuing the
setup, and move all the error handling code to the end of the
function.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Christoph Hellwig 2010-01-20 18:13:25 +01:00 committed by Anthony Liguori
parent 392ecf543d
commit 6987307ca3
1 changed files with 19 additions and 12 deletions
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31
block.c
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@ -428,10 +428,16 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
drv = find_image_format(filename);
}
}
if (!drv) {
ret = -ENOENT;
goto unlink_and_fail;
}
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
ret = -ENOTSUP;
goto unlink_and_fail;
}
bs->drv = drv;
bs->opaque = qemu_mallocz(drv->instance_size);
@ -453,20 +459,12 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
} else {
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
}
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
ret = -ENOTSUP;
} else {
ret = drv->bdrv_open(bs, filename, open_flags);
}
ret = drv->bdrv_open(bs, filename, open_flags);
if (ret < 0) {
qemu_free(bs->opaque);
bs->opaque = NULL;
bs->drv = NULL;
unlink_and_fail:
if (bs->is_temporary)
unlink(filename);
return ret;
goto free_and_fail;
}
if (drv->bdrv_getlength) {
bs->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
}
@ -499,6 +497,15 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
bs->change_cb(bs->change_opaque);
}
return 0;
free_and_fail:
qemu_free(bs->opaque);
bs->opaque = NULL;
bs->drv = NULL;
unlink_and_fail:
if (bs->is_temporary)
unlink(filename);
return ret;
}
void bdrv_close(BlockDriverState *bs)