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5b31646898
If a zoned block device is found, get its zone information (number of zones and zone size). To avoid costly run-time zone report commands to test the device zones type during block allocation, attach the seq_zones bitmap to the device structure to indicate if a zone is sequential or accept random writes. Also it attaches the empty_zones bitmap to indicate if a zone is empty or not. This patch also introduces the helper function btrfs_dev_is_sequential() to test if the zone storing a block is a sequential write required zone and btrfs_dev_is_empty_zone() to test if the zone is a empty zone. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: Damien Le Moal <damien.lemoal@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>
88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTRFS_ZONED_H
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#define BTRFS_ZONED_H
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#include <linux/types.h>
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struct btrfs_zoned_device_info {
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/*
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* Number of zones, zone size and types of zones if bdev is a
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* zoned block device.
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*/
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u64 zone_size;
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u8 zone_size_shift;
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u32 nr_zones;
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unsigned long *seq_zones;
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unsigned long *empty_zones;
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};
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#ifdef CONFIG_BLK_DEV_ZONED
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int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
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struct blk_zone *zone);
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int btrfs_get_dev_zone_info(struct btrfs_device *device);
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void btrfs_destroy_dev_zone_info(struct btrfs_device *device);
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#else /* CONFIG_BLK_DEV_ZONED */
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static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
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struct blk_zone *zone)
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{
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return 0;
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}
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static inline int btrfs_get_dev_zone_info(struct btrfs_device *device)
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{
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return 0;
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}
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static inline void btrfs_destroy_dev_zone_info(struct btrfs_device *device) { }
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#endif
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static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)
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{
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struct btrfs_zoned_device_info *zone_info = device->zone_info;
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if (!zone_info)
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return false;
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return test_bit(pos >> zone_info->zone_size_shift, zone_info->seq_zones);
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}
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static inline bool btrfs_dev_is_empty_zone(struct btrfs_device *device, u64 pos)
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{
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struct btrfs_zoned_device_info *zone_info = device->zone_info;
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if (!zone_info)
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return true;
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return test_bit(pos >> zone_info->zone_size_shift, zone_info->empty_zones);
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}
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static inline void btrfs_dev_set_empty_zone_bit(struct btrfs_device *device,
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u64 pos, bool set)
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{
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struct btrfs_zoned_device_info *zone_info = device->zone_info;
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unsigned int zno;
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if (!zone_info)
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return;
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zno = pos >> zone_info->zone_size_shift;
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if (set)
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set_bit(zno, zone_info->empty_zones);
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else
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clear_bit(zno, zone_info->empty_zones);
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}
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static inline void btrfs_dev_set_zone_empty(struct btrfs_device *device, u64 pos)
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{
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btrfs_dev_set_empty_zone_bit(device, pos, true);
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}
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static inline void btrfs_dev_clear_zone_empty(struct btrfs_device *device, u64 pos)
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{
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btrfs_dev_set_empty_zone_bit(device, pos, false);
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}
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#endif
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