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btrfs: zoned: defer loading zone info after opening trees

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This is a preparation patch to implement zone emulation on a regular
device.

To emulate a zoned filesystem on a regular (non-zoned) device, we need to
decide an emulated zone size. Instead of making it a compile-time static
value, we'll make it configurable at mkfs time. Since we have one zone ==
one device extent restriction, we can determine the emulated zone size
from the size of a device extent. We can extend btrfs_get_dev_zone_info()
to show a regular device filled with conventional zones once the zone size
is decided.

The current call site of btrfs_get_dev_zone_info() during the mount process
is earlier than loading the file system trees so that we don't know the
size of a device extent at this point. Thus we can't slice a regular device
to conventional zones.

This patch introduces btrfs_get_dev_zone_info_all_devices to load the zone
info for all the devices. And, it places this function in open_ctree()
after loading the trees.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.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>
This commit is contained in:
Naohiro Aota 2021-02-04 19:21:42 +09:00 committed by David Sterba
parent c3b0e880bb
commit 7365104236
4 changed files with 44 additions and 4 deletions
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13
fs/btrfs/disk-io.c
View File

@ -3333,6 +3333,19 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
if (ret)
goto fail_tree_roots;
/*
* Get zone type information of zoned block devices. This will also
* handle emulation of a zoned filesystem if a regular device has the
* zoned incompat feature flag set.
*/
ret = btrfs_get_dev_zone_info_all_devices(fs_info);
if (ret) {
btrfs_err(fs_info,
"zoned: failed to read device zone info: %d",
ret);
goto fail_block_groups;
}
/*
* If we have a uuid root and we're not being told to rescan we need to
* check the generation here so we can set the

4
fs/btrfs/volumes.c
View File

@ -669,10 +669,6 @@ static int btrfs_open_one_device(struct btrfs_fs_devices *fs_devices,
clear_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
device->mode = flags;
ret = btrfs_get_dev_zone_info(device);
if (ret != 0)
goto error_free_page;
fs_devices->open_devices++;
if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state) &&
device->devid != BTRFS_DEV_REPLACE_DEVID) {

25
fs/btrfs/zoned.c
View File

@ -143,6 +143,31 @@ static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
return 0;
}
int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)
{
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
struct btrfs_device *device;
int ret = 0;
/* fs_info->zone_size might not set yet. Use the incomapt flag here. */
if (!btrfs_fs_incompat(fs_info, ZONED))
return 0;
mutex_lock(&fs_devices->device_list_mutex);
list_for_each_entry(device, &fs_devices->devices, dev_list) {
/* We can skip reading of zone info for missing devices */
if (!device->bdev)
continue;
ret = btrfs_get_dev_zone_info(device);
if (ret)
break;
}
mutex_unlock(&fs_devices->device_list_mutex);
return ret;
}
int btrfs_get_dev_zone_info(struct btrfs_device *device)
{
struct btrfs_zoned_device_info *zone_info = NULL;

6
fs/btrfs/zoned.h
View File

@ -25,6 +25,7 @@ struct btrfs_zoned_device_info {
#ifdef CONFIG_BLK_DEV_ZONED
int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
struct blk_zone *zone);
int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info);
int btrfs_get_dev_zone_info(struct btrfs_device *device);
void btrfs_destroy_dev_zone_info(struct btrfs_device *device);
int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info);
@ -42,6 +43,11 @@ static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
return 0;
}
static inline int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)
{
return 0;
}
static inline int btrfs_get_dev_zone_info(struct btrfs_device *device)
{
return 0;