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btrfs-progs: mkfs: add a warning label for RAID5/6

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We all know there's some dark and scary corners with RAID5/6, but users
may not know.  Add a warning message in mkfs so anybody trying to use
this will know things can go very wrong.

Issue: #265
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
[ reword message ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-08-25 12:51:02 -04:00 committed by David Sterba
parent b127845f9c
commit 73487311e9
1 changed files with 2 additions and 0 deletions
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2
mkfs/main.c
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@ -1201,6 +1201,8 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
if ((data_profile | metadata_profile) & if ((data_profile | metadata_profile) &
(BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) { (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) {
features |= BTRFS_FEATURE_INCOMPAT_RAID56; features |= BTRFS_FEATURE_INCOMPAT_RAID56;
warning("RAID5/6 support has known problems is strongly discouraged\n"
"\t to be used besides testing or evaluation.\n");
} }
if ((data_profile | metadata_profile) & if ((data_profile | metadata_profile) &