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From: Eric Blake <eblake@redhat.com>
To: qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
	vsementsov@virtuozzo.com, qemu-block@nongnu.org,
	rjones@redhat.com, Max Reitz <mreitz@redhat.com>,
	nsoffer@redhat.com, jsnow@redhat.com
Subject: Re: [Qemu-devel] [PATCH v3 04/19] nbd/server: Hoist length check to qemp_nbd_server_add
Date: Wed, 16 Jan 2019 12:05:09 -0600	[thread overview]
Message-ID: <027e129f-ff0c-c466-bbd1-92542ab937ed@redhat.com> (raw)
In-Reply-To: <20190112175812.27068-5-eblake@redhat.com>

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On 1/12/19 11:57 AM, Eric Blake wrote:

s/qemp/qmp/ in the subject line

> We only had two callers to nbd_export_new; qemu-nbd.c always
> passed a valid offset/length pair (because it already checked
> the file length, to ensure that offset was in bounds), while
> blockdev-nbd always passed 0/-1.  Then nbd_export_new reduces
> the size to a multiple of BDRV_SECTOR_SIZE (can only happen
> when offset is not sector-aligned, since bdrv_getlength()
> currently rounds up), which can result in offset being greater
> than the enforced length, but that's not fatal (the server
> rejects client requests that exceed the advertised length).
> 
> However, I'm finding it easier to work with the code if we are
> consistent on having both callers pass in a valid length, and
> just assert that things are sane in nbd_export_new.
> 
-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org


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  parent reply	other threads:[~2019-01-16 18:16 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-12 17:57 [Qemu-devel] [PATCH v3 00/19] nbd: add qemu-nbd --list Eric Blake
2019-01-12 17:57 ` [Qemu-devel] [PATCH v3 01/19] maint: Allow for EXAMPLES in texi2pod Eric Blake
2019-01-15 17:51   ` Richard W.M. Jones
2019-01-12 17:57 ` [Qemu-devel] [PATCH v3 02/19] qemu-nbd: Enhance man page Eric Blake
2019-01-15 17:53   ` Richard W.M. Jones
2019-01-12 17:57 ` [Qemu-devel] [PATCH v3 03/19] qemu-nbd: Sanity check partition bounds Eric Blake
2019-01-15 16:20   ` Vladimir Sementsov-Ogievskiy
2019-01-15 16:53     ` Eric Blake
2019-01-15 18:00   ` Richard W.M. Jones
2019-01-15 18:08     ` Eric Blake
2019-01-16  7:46   ` Vladimir Sementsov-Ogievskiy
2019-01-12 17:57 ` [Qemu-devel] [PATCH v3 04/19] nbd/server: Hoist length check to qemp_nbd_server_add Eric Blake
2019-01-15  9:44   ` Vladimir Sementsov-Ogievskiy
2019-01-15 15:25     ` Eric Blake
2019-01-15 16:26       ` Vladimir Sementsov-Ogievskiy
2019-01-15 16:58         ` Eric Blake
2019-01-16 18:03           ` Eric Blake
2019-01-16 18:05   ` Eric Blake [this message]
2019-01-12 17:57 ` [Qemu-devel] [PATCH v3 05/19] nbd/server: Favor [u]int64_t over off_t Eric Blake
2019-01-15 10:19   ` Vladimir Sementsov-Ogievskiy
2019-01-15 15:33     ` Eric Blake
2019-01-15 15:41       ` Vladimir Sementsov-Ogievskiy
2019-01-16  8:23       ` Vladimir Sementsov-Ogievskiy
2019-01-16 14:23         ` Eric Blake
2019-01-12 17:57 ` [Qemu-devel] [PATCH v3 06/19] qemu-nbd: Avoid strtol open-coding Eric Blake
2019-01-15 12:31   ` Vladimir Sementsov-Ogievskiy
2019-01-15 15:35     ` Eric Blake
2019-01-15 18:09   ` Richard W.M. Jones
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 07/19] nbd/client: Refactor nbd_receive_list() Eric Blake
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 08/19] nbd/client: Move export name into NBDExportInfo Eric Blake
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 09/19] nbd/client: Change signature of nbd_negotiate_simple_meta_context() Eric Blake
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 10/19] nbd/client: Split out nbd_send_one_meta_context() Eric Blake
2019-01-15 13:18   ` Vladimir Sementsov-Ogievskiy
2019-01-15 15:44     ` Eric Blake
2019-01-15 15:52       ` Vladimir Sementsov-Ogievskiy
2019-01-15 15:55         ` Eric Blake
2019-01-15 15:59           ` Vladimir Sementsov-Ogievskiy
2019-01-16 10:40       ` Vladimir Sementsov-Ogievskiy
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 11/19] nbd/client: Split out nbd_receive_one_meta_context() Eric Blake
2019-01-15 15:05   ` Vladimir Sementsov-Ogievskiy
2019-01-15 15:50     ` Eric Blake
2019-01-15 15:53       ` Vladimir Sementsov-Ogievskiy
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 12/19] nbd/client: Refactor return of nbd_receive_negotiate() Eric Blake
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 13/19] nbd/client: Split handshake into two functions Eric Blake
2019-01-15 15:34   ` Vladimir Sementsov-Ogievskiy
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 14/19] nbd/client: Pull out oldstyle size determination Eric Blake
2019-01-15 15:35   ` Vladimir Sementsov-Ogievskiy
2019-01-15 15:45     ` Vladimir Sementsov-Ogievskiy
2019-01-16 19:47     ` Eric Blake
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 15/19] nbd/client: Add nbd_receive_export_list() Eric Blake
2019-01-16 10:15   ` Vladimir Sementsov-Ogievskiy
2019-01-16 14:33     ` Eric Blake
2019-01-16 20:01     ` Eric Blake
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 16/19] nbd/client: Add meta contexts to nbd_receive_export_list() Eric Blake
2019-01-16 10:54   ` Vladimir Sementsov-Ogievskiy
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 17/19] qemu-nbd: Add --list option Eric Blake
2019-01-17 10:05   ` Vladimir Sementsov-Ogievskiy
2019-01-17 16:58     ` Eric Blake
2019-01-17 17:11       ` Vladimir Sementsov-Ogievskiy
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 18/19] nbd/client: Work around 3.0 bug for listing meta contexts Eric Blake
2019-01-16 15:43   ` Vladimir Sementsov-Ogievskiy
2019-01-17  3:21     ` Eric Blake
2019-01-17  8:07       ` Vladimir Sementsov-Ogievskiy
2019-01-17 14:20         ` Eric Blake
2019-01-12 17:58 ` [Qemu-devel] [PATCH v3 19/19] iotests: Enhance 223, 233 to cover 'qemu-nbd --list' Eric Blake
2019-01-17 13:34   ` Eric Blake
2019-01-14 12:22 ` [Qemu-devel] [PATCH v3 00/19] nbd: add qemu-nbd --list Vladimir Sementsov-Ogievskiy
2019-01-14 16:46   ` Eric Blake
2019-01-17 11:38 ` Vladimir Sementsov-Ogievskiy
2019-01-17 14:20   ` Eric Blake
2019-01-23 12:36 ` no-reply

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