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| author | Johannes Thumshirn <johannes.thumshirn@wdc.com> | 2021-02-04 19:21:47 +0900 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2021-02-09 02:32:21 +0100 |
| commit | 3c9daa09ccd43f68104634020b364d834c01738c (patch) | |
| tree | 0457023b30beacfa24237b25856f814aa9e53271 /fs/btrfs/zoned.h | |
| parent | 1cb3dc3f79153c2d7f9a4438381e1385dff09656 (diff) | |
| download | lwn-3c9daa09ccd43f68104634020b364d834c01738c.tar.gz lwn-3c9daa09ccd43f68104634020b364d834c01738c.zip | |
btrfs: zoned: allow zoned filesystems on non-zoned block devices
Run a zoned filesystem on non-zoned devices. This is done by "slicing up"
the block device into static sized chunks and fake a conventional zone on
each of them. The emulated zone size is determined from the size of device
extent.
This is mainly aimed at testing of zoned filesystems, i.e. the zoned
chunk allocator, on regular block devices.
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/zoned.h')
| -rw-r--r-- | fs/btrfs/zoned.h | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/fs/btrfs/zoned.h b/fs/btrfs/zoned.h index eb47b7ad9ab1..5e78786bb723 100644 --- a/fs/btrfs/zoned.h +++ b/fs/btrfs/zoned.h @@ -142,12 +142,16 @@ static inline void btrfs_dev_clear_zone_empty(struct btrfs_device *device, u64 p static inline bool btrfs_check_device_zone_type(const struct btrfs_fs_info *fs_info, struct block_device *bdev) { - u64 zone_size; - if (btrfs_is_zoned(fs_info)) { - zone_size = bdev_zone_sectors(bdev) << SECTOR_SHIFT; - /* Do not allow non-zoned device */ - return bdev_is_zoned(bdev) && fs_info->zone_size == zone_size; + /* + * We can allow a regular device on a zoned filesystem, because + * we will emulate the zoned capabilities. + */ + if (!bdev_is_zoned(bdev)) + return true; + + return fs_info->zone_size == + (bdev_zone_sectors(bdev) << SECTOR_SHIFT); } /* Do not allow Host Manged zoned device */ |