38 lines
1.4 KiB
Diff
38 lines
1.4 KiB
Diff
From: Adam Borowski <kilobyte@angband.pl>
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Date: Tue, 28 Mar 2017 16:55:05 +0200
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Subject: btrfs: warn about RAID5/6 being experimental at mount time
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Bug-Debian: https://bugs.debian.org/863290
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Origin: https://bugs.debian.org/863290#5
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Too many people come complaining about losing their data -- and indeed,
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there's no warning outside a wiki and the mailing list tribal knowledge.
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Message severity chosen for consistency with XFS -- "alert" makes dmesg
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produce nice red background which should get the point across.
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Signed-off-by: Adam Borowski <kilobyte@angband.pl>
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[bwh: Also add_taint() so this is flagged in bug reports]
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---
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fs/btrfs/disk-io.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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Index: linux/fs/btrfs/disk-io.c
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===================================================================
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--- linux.orig/fs/btrfs/disk-io.c
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+++ linux/fs/btrfs/disk-io.c
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@@ -3089,6 +3089,15 @@ retry_root_backup:
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btrfs_set_and_info(fs_info, SSD, "enabling ssd optimizations");
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}
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+ if ((fs_info->avail_data_alloc_bits |
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+ fs_info->avail_metadata_alloc_bits |
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+ fs_info->avail_system_alloc_bits) &
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+ BTRFS_BLOCK_GROUP_RAID56_MASK) {
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+ btrfs_alert(fs_info,
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+ "btrfs RAID5/6 is EXPERIMENTAL and has known data-loss bugs");
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+ add_taint(TAINT_USER, LOCKDEP_STILL_OK);
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+ }
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+
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/*
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* Mount does not set all options immediately, we can do it now and do
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* not have to wait for transaction commit
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