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b=h6I8PZSVMPAt7YLy1ARh3aGp6wHTuBJJe9btzVP6huSNov01zigPU+6TTaKOYPmml2gfc+ JDC/U4jgHZgkxAyTEgwaQMbvjuQZp8fy2d4p/6sm8LTwv6JXXLtSyN/ejDCbBfYRcsbqV9 zOuEaaK9RrBzuZN7fB4EraP4K/XaJLk= X-MC-Unique: wR1DPRPDMzq8GoyQt3P06w-1 From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= To: qemu-devel@nongnu.org Subject: [PATCH] RFC: qemu-ga: skip loop mount fs to avoid qemu-ga hang Date: Mon, 6 Jul 2020 20:58:28 +0400 Message-Id: <20200706165828.273523-1-marcandre.lureau@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=marcandre.lureau@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.139.110.120; envelope-from=marcandre.lureau@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/06 01:22:37 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , mdroth@linux.vnet.ibm.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) If the underlying filesystem is already frozen, ioctl(FIFREEZE) might hang. guest-fsfreeze is done in reverse order of /proc/self/mountinfo list, but it seems insufficient to prevent that situation. Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=3D1782626 Signed-off-by: Marc-Andr=C3=A9 Lureau --- qga/commands-posix.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/qga/commands-posix.c b/qga/commands-posix.c index cdbeb59dccd..c4dce400302 100644 --- a/qga/commands-posix.c +++ b/qga/commands-posix.c @@ -623,6 +623,7 @@ typedef struct FsMount { char *dirname; char *devtype; unsigned int devmajor, devminor; + bool is_loop; QTAILQ_ENTRY(FsMount) next; } FsMount; =20 @@ -668,6 +669,11 @@ static int dev_major_minor(const char *devpath, return -1; } =20 +static bool +fsname_is_loop_device(const char *fsname) +{ + return g_str_has_prefix(fsname, "/dev/loop"); +} /* * Walk the mount table and build a list of local file systems */ @@ -707,6 +713,7 @@ static void build_fs_mount_list_from_mtab(FsMountList *= mounts, Error **errp) mount->devtype =3D g_strdup(ment->mnt_type); mount->devmajor =3D devmajor; mount->devminor =3D devminor; + mount->is_loop =3D fsname_is_loop_device(ment->mnt_fsname); =20 QTAILQ_INSERT_TAIL(mounts, mount, next); } @@ -786,6 +793,7 @@ static void build_fs_mount_list(FsMountList *mounts, Er= ror **errp) mount->devtype =3D g_strdup(dash + type_s); mount->devmajor =3D devmajor; mount->devminor =3D devminor; + mount->is_loop =3D fsname_is_loop_device(dash + dev_s); =20 QTAILQ_INSERT_TAIL(mounts, mount, next); } @@ -1304,6 +1312,10 @@ int64_t qmp_guest_fsfreeze_freeze_list(bool has_moun= tpoints, } } =20 + if (mount->is_loop) { + continue; + } + fd =3D qemu_open(mount->dirname, O_RDONLY); if (fd =3D=3D -1) { error_setg_errno(errp, errno, "failed to open %s", mount->dirn= ame); --=20 2.27.0.90.geebb51ba8c