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btrfs: introduce max_zone_append_size 

The zone append write command has a maximum IO size restriction it
accepts. This is because a zone append write command cannot be split, as
we ask the device to place the data into a specific target zone and the
device responds with the actual written location of the data.

Introduce max_zone_append_size to zone_info and fs_info to track the
value, so we can limit all I/O to a zoned block device that we want to
write using the zone append command to the device's limits.

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 2020-11-10 20:26:09 +09:00 committed by David Sterba
parent b70f509774
commit 862931c763
3 changed files with 19 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/btrfs/ctree.h
View File

@ -965,6 +965,9 @@ struct btrfs_fs_info {
u64 zoned;
};
/* Max size to emit ZONE_APPEND write command */
u64 max_zone_append_size;
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
spinlock_t ref_verify_lock;
struct rb_root block_tree;

17
fs/btrfs/zoned.c
View File

@ -47,6 +47,7 @@ int btrfs_get_dev_zone_info(struct btrfs_device *device)
{
struct btrfs_zoned_device_info *zone_info = NULL;
struct block_device *bdev = device->bdev;
struct request_queue *queue = bdev_get_queue(bdev);
sector_t nr_sectors;
sector_t sector = 0;
struct blk_zone *zones = NULL;
@ -70,6 +71,8 @@ int btrfs_get_dev_zone_info(struct btrfs_device *device)
ASSERT(zone_sectors != 0 && (zone_sectors & (zone_sectors - 1)) == 0);
zone_info->zone_size = zone_sectors << SECTOR_SHIFT;
zone_info->zone_size_shift = ilog2(zone_info->zone_size);
zone_info->max_zone_append_size =
(u64)queue_max_zone_append_sectors(queue) << SECTOR_SHIFT;
zone_info->nr_zones = nr_sectors >> ilog2(zone_sectors);
if (!IS_ALIGNED(nr_sectors, zone_sectors))
zone_info->nr_zones++;
@ -174,6 +177,7 @@ int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)
u64 zoned_devices = 0;
u64 nr_devices = 0;
u64 zone_size = 0;
u64 max_zone_append_size = 0;
const bool incompat_zoned = btrfs_is_zoned(fs_info);
int ret = 0;
@ -187,10 +191,13 @@ int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)
model = bdev_zoned_model(device->bdev);
if (model == BLK_ZONED_HM ||
(model == BLK_ZONED_HA && incompat_zoned)) {
struct btrfs_zoned_device_info *zone_info;
zone_info = device->zone_info;
zoned_devices++;
if (!zone_size) {
zone_size = device->zone_info->zone_size;
} else if (device->zone_info->zone_size != zone_size) {
zone_size = zone_info->zone_size;
} else if (zone_info->zone_size != zone_size) {
btrfs_err(fs_info,
"zoned: unequal block device zone sizes: have %llu found %llu",
device->zone_info->zone_size,
@ -198,6 +205,11 @@ int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)
ret = -EINVAL;
goto out;
}
if (!max_zone_append_size ||
(zone_info->max_zone_append_size &&
zone_info->max_zone_append_size < max_zone_append_size))
max_zone_append_size =
zone_info->max_zone_append_size;
}
nr_devices++;
}
@ -241,6 +253,7 @@ int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)
}
fs_info->zone_size = zone_size;
fs_info->max_zone_append_size = max_zone_append_size;
btrfs_info(fs_info, "zoned mode enabled with zone size %llu", zone_size);
out:

1
fs/btrfs/zoned.h
View File

@ -13,6 +13,7 @@ struct btrfs_zoned_device_info {
*/
u64 zone_size;
u8 zone_size_shift;
u64 max_zone_append_size;
u32 nr_zones;
unsigned long *seq_zones;
unsigned long *empty_zones;