From: "Daniel P. Berrange" <berrange@redhat.com>
To: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org, qemu-devel@nongnu.org,
virtualization@lists.linux-foundation.org,
Tony Luck <tony.luck@intel.com>,
Radim Kr??m???? <rkrcmar@redhat.com>,
Kees Cook <keescook@chromium.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
Anton Vorontsov <anton@enomsg.org>,
LKML <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Minchan Kim <minchan@kernel.org>,
Anthony Liguori <aliguori@amazon.com>,
Colin Cross <ccross@android.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [Qemu-devel] [PATCH 6/7] qemu: Implement virtio-pstore device
Date: Mon, 1 Aug 2016 10:24:39 +0100 [thread overview]
Message-ID: <20160801092439.GF6455@redhat.com> (raw)
In-Reply-To: <20160730085702.GB26275@danjae.aot.lge.com>
On Sat, Jul 30, 2016 at 05:57:02PM +0900, Namhyung Kim wrote:
> On Thu, Jul 28, 2016 at 02:22:39PM +0100, Daniel P. Berrange wrote:
> > > +static void virtio_pstore_from_filename(VirtIOPstore *s, char *name,
> > > + char *buf, size_t sz,
> > > + struct virtio_pstore_fileinfo *info)
> > > +{
> > > + snprintf(buf, sz, "%s/%s", s->directory, name);
> > > +
> > > + if (g_str_has_prefix(name, "dmesg-")) {
> > > + info->type = VIRTIO_PSTORE_TYPE_DMESG;
> > > + name += strlen("dmesg-");
> > > + } else if (g_str_has_prefix(name, "console-")) {
> > > + info->type = VIRTIO_PSTORE_TYPE_CONSOLE;
> > > + name += strlen("console-");
> > > + } else if (g_str_has_prefix(name, "unknown-")) {
> > > + info->type = VIRTIO_PSTORE_TYPE_UNKNOWN;
> > > + name += strlen("unknown-");
> > > + }
[snip]
> > > + struct virtio_pstore_fileinfo info;
> > > + size_t offset = sizeof(*res) + sizeof(info);
> > > +
> > > + if (s->dirp == NULL) {
> > > + return -1;
> > > + }
> > > +
> > > + dent = readdir(s->dirp);
> > > + while (dent) {
> > > + if (dent->d_name[0] != '.') {
> > > + break;
> > > + }
> > > + dent = readdir(s->dirp);
> > > + }
> > > +
> > > + if (dent == NULL) {
> > > + return 0;
> > > + }
> >
> > So this seems to just be picking the first filename reported by
> > readdir that isn't starting with '.'. Surely this can't the right
> > logic when your corresponding do_write method can pick several
> > different filenames, its potluck which do_read will give back.
>
> Do you mean that it'd be better to check a list of known filenames and
> fail if not?
No, I mean that you have several different VIRTIO_PSTORE_TYPE_nnn and
use a different file for each constant. When reading this directory
though you're not looking for the file corresponding to any given
VIRTIO_PSTORE_TYPE_nnn - you're simply reading whichever file is found
first. So you might have just read a TYPE_CONSOLE or have read a
TYPE_DMESG - it surely doesn't make sense to randonly read either
TYPE_CONSOLE or TYPE_DMESG based on whatever order readdir() lists
the files.
Regards,
Daniel
--
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next prev parent reply other threads:[~2016-08-01 9:24 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-27 15:08 [RFC/PATCHSET 0/7] virtio: Implement virtio pstore device (v2) Namhyung Kim
2016-07-27 15:08 ` [PATCH 1/7] pstore: Split pstore fragile flags Namhyung Kim
2016-07-27 15:08 ` [PATCH 2/7] pstore/ram: Set pstore flags dynamically Namhyung Kim
2016-07-27 15:08 ` [PATCH 3/7] pstore: Manage buffer position for async write Namhyung Kim
2016-07-27 15:08 ` [PATCH 4/7] virtio: Basic implementation of virtio pstore driver Namhyung Kim
2016-07-27 15:08 ` [PATCH 5/7] virtio-pstore: Support PSTORE_TYPE_CONSOLE Namhyung Kim
2016-07-27 15:08 ` [PATCH 6/7] qemu: Implement virtio-pstore device Namhyung Kim
2016-07-28 0:02 ` Michael S. Tsirkin
2016-07-28 5:39 ` Namhyung Kim
2016-07-28 12:56 ` Stefan Hajnoczi
2016-07-28 13:08 ` [Qemu-devel] " Daniel P. Berrange
2016-07-30 8:38 ` Namhyung Kim
2016-08-01 9:21 ` Daniel P. Berrange
2016-08-01 15:34 ` Namhyung Kim
2016-07-28 14:38 ` Steven Rostedt
2016-07-28 13:22 ` [Qemu-devel] " Daniel P. Berrange
2016-07-30 8:57 ` Namhyung Kim
2016-08-01 9:24 ` Daniel P. Berrange [this message]
2016-08-01 15:52 ` Namhyung Kim
2016-07-27 15:08 ` [PATCH 7/7] kvmtool: " Namhyung Kim
2016-07-27 22:18 ` [RFC/PATCHSET 0/7] virtio: Implement virtio pstore device (v2) Michael S. Tsirkin
2016-07-28 2:46 ` Namhyung Kim
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