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btrfs-progs: zoned: disallow mixed-bg in ZONED mode 

Placing both data and metadata in a block group is impossible in ZONED
mode. For data, we can allocate a space for it and write it immediately
after the allocation. For metadata, however, we cannot do that, because the
logical addresses are recorded in other metadata buffers to build up the
trees. As a result, a data buffer can be placed after a metadata buffer,
which is not written yet. Writing out the data buffer will break the
sequential write rule.

Check and disallow MIXED_BG with ZONED mode.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Naohiro Aota 2021-04-26 15:27:24 +09:00 committed by David Sterba
parent 3c0f83e541
commit 707f0716e0
1 changed files with 6 additions and 0 deletions
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6
kernel-shared/zoned.c
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@ -345,6 +345,12 @@ int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)
goto out;
}
if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) {
error("zoned: mixed block groups not supported");
ret = -EINVAL;
goto out;
}
fs_info->zone_size = zone_size;
fs_info->max_zone_append_size = max_zone_append_size;