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https://github.com/kdave/btrfs-progs/pull/706
From 027a08d659033e3b892760bfd4c19c6db9e9fa3f Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Sun, 5 Nov 2023 20:13:07 +0000
Subject: [PATCH] kernel-shared/uapi/btrfs.h: fix BTRFS_IOC_SCAN_DEV
Without the change `BTRFS_IOC_SCAN_DEV` aliased with `BTRFS_IOC_FORGET_DEV`.
It's a regression introduced in fcd9142b6 "btrfs-progs: docs: formatting,
fixups, updates".
It manifests as a sudden device disappearance when device is scanned:
machine # [ 4.095032] Btrfs loaded, crc32c=crc32c-intel, zoned=no, fsverity=no
machine # ERROR: device scan failed on '/dev/vdb': No such file or directory
machine # ERROR: device scan failed on '/dev/vdc': No such file or directory
(finished: must succeed: mkfs.btrfs -d raid0 /dev/vdb /dev/vdc, in 10.31 seconds)
Reported-by: Atemu <atemu.main@gmail.com>
Bug: https://github.com/NixOS/nixpkgs/issues/265668
--- a/kernel-shared/uapi/btrfs.h
+++ b/kernel-shared/uapi/btrfs.h
@@ -1171,7 +1171,7 @@ enum btrfs_err_code {
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
struct btrfs_ioctl_vol_args)
-#define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 5, \
+#define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_FORGET_DEV _IOW(BTRFS_IOCTL_MAGIC, 5, \
struct btrfs_ioctl_vol_args)
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