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