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SubjectRe: [PATCH 03/19] btrfs: Check and enable HMZONED mode
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.lemoal@wdc.com>
> Signed-off-by: Naohiro Aota <naohiro.aota@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,

Josef

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