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btrfs: subpage: reject raid56 filesystem and profile conversion 

RAID56 is not only unsafe due to its write-hole problem, but also has
tons of hardcoded PAGE_SIZE.

Disable it for subpage support for now.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2021-07-26 14:35:01 +08:00 committed by David Sterba
parent e0eefe07f8
commit c8050b3b7f
2 changed files with 17 additions and 0 deletions
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10
fs/btrfs/disk-io.c
View File

@ -3402,6 +3402,16 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
goto fail_alloc;
}
}
if (sectorsize != PAGE_SIZE) {
if (btrfs_super_incompat_flags(fs_info->super_copy) &
BTRFS_FEATURE_INCOMPAT_RAID56) {
btrfs_err(fs_info,
"RAID56 is not yet supported for sector size %u with page size %lu",
sectorsize, PAGE_SIZE);
err = -EINVAL;
goto fail_alloc;
}
}
ret = btrfs_init_workqueues(fs_info, fs_devices);
if (ret) {

7
fs/btrfs/volumes.c
View File

@ -3968,6 +3968,13 @@ static inline int validate_convert_profile(struct btrfs_fs_info *fs_info,
if (!(bargs->flags & BTRFS_BALANCE_ARGS_CONVERT))
return true;
if (fs_info->sectorsize < PAGE_SIZE &&
bargs->target & BTRFS_BLOCK_GROUP_RAID56_MASK) {
btrfs_err(fs_info,
"RAID56 is not yet supported for sectorsize %u with page size %lu",
fs_info->sectorsize, PAGE_SIZE);
return false;
}
/* Profile is valid and does not have bits outside of the allowed set */
if (alloc_profile_is_valid(bargs->target, 1) &&
(bargs->target & ~allowed) == 0)