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From: | Kevin Wolf |
Subject: | Re: [Qemu-devel] [PATCH] qemu-io: Fix handling of bdrv_is_allocated() return value |
Date: | Thu, 09 Apr 2009 15:42:22 +0200 |
User-agent: | Thunderbird 2.0.0.21 (X11/20090320) |
Christoph Hellwig schrieb:
On Thu, Apr 09, 2009 at 03:05:27PM +0200, Kevin Wolf wrote:bdrv_is_allocated() returns a boolean which indicates if the offset is allocated, not 0 on success and everything else is an error.Yeah, the handling wa wrong before. But a return value of 0 and *pnum = 0 seems to be a special error-ish value still which we might want to handle.
The header comment of bdrv_is_allocated() doesn't specify error conditions. ;-)
You seem to be right that there is one place in block.c where *pnum = 0 is used as something like an error return value. This isn't consistent though, qcow and vmdk return non-zero values in *pnum under the same conditions.
Maybe another patch to change that and bring the error message back again on *pnum == 0?
Kevin
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