From 95206472cc88fc2642d83afb9e9e59370a12bc8c Mon Sep 17 00:00:00 2001 From: Chen Qun Date: Wed, 9 Feb 2022 11:10:42 +0800 Subject: [PATCH] qemu-pr: fixed ioctl failed for multipath disk We use ioctl to detect multipath devices. However, we only set flags in struct dm_ioctl (the argument to ioctl) and left other fields in random, which may cause the failure of calling ioctl. Hence, we set other fields to 0 to avoid the failure. Signed-off-by: wangjian161 --- ...ixed-ioctl-failed-for-multipath-disk.patch | 36 +++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 qemu-pr-fixed-ioctl-failed-for-multipath-disk.patch diff --git a/qemu-pr-fixed-ioctl-failed-for-multipath-disk.patch b/qemu-pr-fixed-ioctl-failed-for-multipath-disk.patch new file mode 100644 index 0000000..7985a92 --- /dev/null +++ b/qemu-pr-fixed-ioctl-failed-for-multipath-disk.patch @@ -0,0 +1,36 @@ +From 56f59125707c0222bbb5d7f820792aba17c3db08 Mon Sep 17 00:00:00 2001 +From: WangJian +Date: Wed, 9 Feb 2022 11:10:42 +0800 +Subject: [PATCH] qemu-pr: fixed ioctl failed for multipath disk + +We use ioctl to detect multipath devices. However, we only set flags in +struct dm_ioctl (the argument to ioctl) and left other fields in random, +which may cause the failure of calling ioctl. Hence, we set other +fields to 0 to avoid the failure. + +Signed-off-by: wangjian161 +--- + scsi/qemu-pr-helper.c | 5 ++++- + 1 file changed, 4 insertions(+), 1 deletion(-) + +diff --git a/scsi/qemu-pr-helper.c b/scsi/qemu-pr-helper.c +index f281daeced..bbb9b57741 100644 +--- a/scsi/qemu-pr-helper.c ++++ b/scsi/qemu-pr-helper.c +@@ -288,9 +288,12 @@ static void multipath_pr_init(void) + + static int is_mpath(int fd) + { +- struct dm_ioctl dm = { .flags = DM_NOFLUSH_FLAG }; ++ struct dm_ioctl dm; + struct dm_target_spec *tgt; + ++ memset(&dm, 0, sizeof(struct dm_ioctl)); ++ dm.flags = DM_NOFLUSH_FLAG; ++ + tgt = dm_dev_ioctl(fd, DM_TABLE_STATUS, &dm); + if (!tgt) { + if (errno == ENXIO) { +-- +2.27.0 +