blob: abc4cc2bd0152d461c76abc43b321debcb16b91a (
plain)
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
36
37
|
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]
[2023-01-10: still accurate according to btrfs-progs own manpage:
https://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git/commit/?id=922797e15590b836e377d6dc47b828356cafc2a9]
---
fs/btrfs/disk-io.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3832,6 +3832,15 @@ int __cold open_ctree(struct super_block *sb,
btrfs_set_and_info(fs_info, SSD, "enabling ssd optimizations");
}
+ 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_AUX, LOCKDEP_STILL_OK);
+ }
+
/*
* For devices supporting discard turn on discard=async automatically,
* unless it's already set or disabled. This could be turned off by
|
