On 2019/06/13 22:57, Josef Bacik wrote:
> On Fri, Jun 07, 2019 at 10:10:09PM +0900, Naohiro Aota wrote:
>> HMZONED mode cannot be used together with the RAID5/6 profile for now.
>> Introduce the function btrfs_check_hmzoned_mode() to check this. This
>> function will also check if HMZONED flag is enabled on the file system and
>> if the file system consists of zoned devices with equal zone size.
>>
>> Additionally, as updates to the space cache are in-place, the space cache
>> cannot be located over sequential zones and there is no guarantees that the
>> device will have enough conventional zones to store this cache. Resolve
>> this problem by disabling completely the space cache. This does not
>> introduces any problems with sequential block groups: all the free space is
>> located after the allocation pointer and no free space before the pointer.
>> There is no need to have such cache.
>>
>> Signed-off-by: Damien Le Moal <damien.lem...@wdc.com>
>> Signed-off-by: Naohiro Aota <naohiro.a...@wdc.com>
>> ---
>> fs/btrfs/ctree.h | 3 ++
>> fs/btrfs/dev-replace.c | 7 +++
>> fs/btrfs/disk-io.c | 7 +++
>> fs/btrfs/super.c | 12 ++---
>> fs/btrfs/volumes.c | 99 ++++++++++++++++++++++++++++++++++++++++++
>> fs/btrfs/volumes.h | 1 +
>> 6 files changed, 124 insertions(+), 5 deletions(-)
>>
>> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
>> index b81c331b28fa..6c00101407e4 100644
>> --- a/fs/btrfs/ctree.h
>> +++ b/fs/btrfs/ctree.h
>> @@ -806,6 +806,9 @@ struct btrfs_fs_info {
>> struct btrfs_root *uuid_root;
>> struct btrfs_root *free_space_root;
>>
>> + /* Zone size when in HMZONED mode */
>> + u64 zone_size;
>> +
>> /* the log root tree is a directory of all the other log roots */
>> struct btrfs_root *log_root_tree;
>>
>> diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
>> index ee0989c7e3a9..fbe5ea2a04ed 100644
>> --- a/fs/btrfs/dev-replace.c
>> +++ b/fs/btrfs/dev-replace.c
>> @@ -201,6 +201,13 @@ static int btrfs_init_dev_replace_tgtdev(struct
>> btrfs_fs_info *fs_info,
>> return PTR_ERR(bdev);
>> }
>>
>> + if ((bdev_zoned_model(bdev) == BLK_ZONED_HM &&
>> + !btrfs_fs_incompat(fs_info, HMZONED)) ||
>> + (!bdev_is_zoned(bdev) && btrfs_fs_incompat(fs_info, HMZONED))) {
>
> You do this in a few places, turn this into a helper please.
>
>> + ret = -EINVAL;
>> + goto error;
>> + }
>> +
>> filemap_write_and_wait(bdev->bd_inode->i_mapping);
>>
>> devices = &fs_info->fs_devices->devices;
>> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
>> index 663efce22d98..7c1404c76768 100644
>> --- a/fs/btrfs/disk-io.c
>> +++ b/fs/btrfs/disk-io.c
>> @@ -3086,6 +3086,13 @@ int open_ctree(struct super_block *sb,
>>
>> btrfs_free_extra_devids(fs_devices, 1);
>>
>> + ret = btrfs_check_hmzoned_mode(fs_info);
>> + if (ret) {
>> + btrfs_err(fs_info, "failed to init hmzoned mode: %d",
>> + ret);
>> + goto fail_block_groups;
>> + }
>> +
>> ret = btrfs_sysfs_add_fsid(fs_devices, NULL);
>> if (ret) {
>> btrfs_err(fs_info, "failed to init sysfs fsid interface: %d",
>> diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
>> index 2c66d9ea6a3b..740a701f16c5 100644
>> --- a/fs/btrfs/super.c
>> +++ b/fs/btrfs/super.c
>> @@ -435,11 +435,13 @@ int btrfs_parse_options(struct btrfs_fs_info *info,
>> char *options,
>> bool saved_compress_force;
>> int no_compress = 0;
>>
>> - cache_gen = btrfs_super_cache_generation(info->super_copy);
>> - if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE))
>> - btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE);
>> - else if (cache_gen)
>> - btrfs_set_opt(info->mount_opt, SPACE_CACHE);
>> + if (!btrfs_fs_incompat(info, HMZONED)) {
>> + cache_gen = btrfs_super_cache_generation(info->super_copy);
>> + if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE))
>> + btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE);
>> + else if (cache_gen)
>> + btrfs_set_opt(info->mount_opt, SPACE_CACHE);
>> + }
>>
>
> This disables the free space tree as well as the cache, sounds like you only
> need to disable the free space cache? Thanks,
Right. We can still use the free space tree on HMZONED. I'll fix in the next
version.
Thanks
