qemu-devel.nongnu.org archive mirror
 help / color / mirror / Atom feed
From: Paolo Bonzini <pbonzini@redhat.com>
To: qemu-devel@nongnu.org
Cc: qemu-block@nongnu.org
Subject: [Qemu-devel] [PATCH] scsi: turn "is this a SCSI device?" into a conditional hint
Date: Wed, 21 Mar 2018 11:58:30 +0100	[thread overview]
Message-ID: <20180321105830.22412-1-pbonzini@redhat.com> (raw)

If the user does not have permissions to send ioctls to the device (due to
SELinux or cgroups, for example), the output can look like

qemu-kvm: -device scsi-block,drive=disk: cannot get SG_IO version number:
  Operation not permitted.  Is this a SCSI device?

but this is confusing because the ioctl was blocked _before_ the device
even received the SG_GET_VERSION_NUM ioctl.  Therefore, for EPERM errors
the suggestion should be eliminated.  To make that simpler, change the
code to use error_append_hint.

Reported-by: Ala Hino <ahino@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/scsi/scsi-disk.c    | 7 ++++---
 hw/scsi/scsi-generic.c | 7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index 94043ed024..ccc245589a 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -2637,9 +2637,10 @@ static void scsi_block_realize(SCSIDevice *dev, Error **errp)
     /* check we are using a driver managing SG_IO (version 3 and after) */
     rc = blk_ioctl(s->qdev.conf.blk, SG_GET_VERSION_NUM, &sg_version);
     if (rc < 0) {
-        error_setg(errp, "cannot get SG_IO version number: %s.  "
-                     "Is this a SCSI device?",
-                     strerror(-rc));
+        error_setg(errp, "cannot get SG_IO version number: %s", strerror(-rc));
+        if (rc != -EPERM) {
+            error_append_hint(errp, "Is this a SCSI device?");
+        }
         return;
     }
     if (sg_version < 30000) {
diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index 7414fe2d67..b3de5df324 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -500,9 +500,10 @@ static void scsi_generic_realize(SCSIDevice *s, Error **errp)
     /* check we are using a driver managing SG_IO (version 3 and after */
     rc = blk_ioctl(s->conf.blk, SG_GET_VERSION_NUM, &sg_version);
     if (rc < 0) {
-        error_setg(errp, "cannot get SG_IO version number: %s.  "
-                         "Is this a SCSI device?",
-                         strerror(-rc));
+        error_setg(errp, "cannot get SG_IO version number: %s", strerror(-rc));
+        if (rc != -EPERM) {
+            error_append_hint(errp, "Is this a SCSI device?");
+        }
         return;
     }
     if (sg_version < 30000) {
-- 
2.16.2

             reply	other threads:[~2018-03-21 10:58 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-21 10:58 Paolo Bonzini [this message]
2018-03-21 12:17 ` [Qemu-devel] [PATCH] scsi: turn "is this a SCSI device?" into a conditional hint Laurent Vivier
2018-03-21 12:27   ` Paolo Bonzini
2018-03-21 12:35 ` Eric Blake
2018-03-22  2:12 ` Fam Zheng
  -- strict thread matches above, loose matches on Subject: below --
2018-03-21 12:54 Paolo Bonzini
2018-03-21 12:55 ` Laurent Vivier

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20180321105830.22412-1-pbonzini@redhat.com \
    --to=pbonzini@redhat.com \
    --cc=qemu-block@nongnu.org \
    --cc=qemu-devel@nongnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).