Package: linux / 4.9.189-3

debian/btrfs-warn-about-raid5-6-being-experimental-at-mount.patch Patch series | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
From: Adam Borowski <kilobyte@angband.pl>
Date: Tue, 28 Mar 2017 16:55:05 +0200
Subject: btrfs: warn about RAID5/6 being experimental at mount time
Bug-Debian: https://bugs.debian.org/863290
Origin: https://bugs.debian.org/863290#5

Too many people come complaining about losing their data -- and indeed,
there's no warning outside a wiki and the mailing list tribal knowledge.
Message severity chosen for consistency with XFS -- "alert" makes dmesg
produce nice red background which should get the point across.

Signed-off-by: Adam Borowski <kilobyte@angband.pl>
[bwh: Also add_taint() so this is flagged in bug reports]
---
 fs/btrfs/disk-io.c | 8 ++++++++
 1 file changed, 8 insertions(+)

--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3098,6 +3098,15 @@ retry_root_backup:
 		btrfs_set_opt(fs_info->mount_opt, SSD);
 	}
 
+	if ((fs_info->avail_data_alloc_bits |
+	     fs_info->avail_metadata_alloc_bits |
+	     fs_info->avail_system_alloc_bits) &
+	    BTRFS_BLOCK_GROUP_RAID56_MASK) {
+		btrfs_alert(fs_info,
+		"btrfs RAID5/6 is EXPERIMENTAL and has known data-loss bugs");
+		add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+	}
+
 	/*
 	 * Mount does not set all options immediately, we can do it now and do
 	 * not have to wait for transaction commit