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https://github.com/kdave/btrfs-progs
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3c0f83e541
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. Zone append command is mandatory for zoned btrfs. So, reject a device with max_zone_append_size == 0. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com>
47 lines
933 B
C
47 lines
933 B
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 "kerncompat.h"
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#include <stdbool.h>
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#ifdef BTRFS_ZONED
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#include <linux/blkzoned.h>
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#else
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struct blk_zone {
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int dummy;
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};
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#endif /* BTRFS_ZONED */
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/*
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* Zoned block device models
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*/
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enum btrfs_zoned_model {
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ZONED_NONE,
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ZONED_HOST_AWARE,
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ZONED_HOST_MANAGED,
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};
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/*
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* Zone information for a zoned block device.
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*/
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struct btrfs_zoned_device_info {
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enum btrfs_zoned_model model;
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u64 zone_size;
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u64 max_zone_append_size;
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u32 nr_zones;
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struct blk_zone *zones;
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};
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enum btrfs_zoned_model zoned_model(const char *file);
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u64 zone_size(const char *file);
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int btrfs_get_zone_info(int fd, const char *file,
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struct btrfs_zoned_device_info **zinfo);
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int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info);
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int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info);
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#endif /* __BTRFS_ZONED_H__ */
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