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5d1ab66c56
As updates to the space cache v1 are in-place, the space cache cannot be located over sequential zones and there is no guarantees that the device will have enough conventional zones to store this cache. Resolve this problem by disabling completely the space cache v1. This does not introduce any problems with sequential block groups: all the free space is located after the allocation pointer and no free space before the pointer. There is no need to have such cache. Note: we can technically use free-space-tree (space cache v2) on ZONED mode. But, since ZONED mode now always allocates extents in a block group sequentially regardless of underlying device zone type, it's no use to enable and maintain the tree. For the same reason, NODATACOW is also disabled. In summary, ZONED will disable: | Disabled features | Reason | |-------------------+-----------------------------------------------------| | RAID/DUP | Cannot handle two zone append writes to different | | | zones | |-------------------+-----------------------------------------------------| | space_cache (v1) | In-place updating | | NODATACOW | In-place updating | |-------------------+-----------------------------------------------------| | fallocate | Reserved extent will be a write hole | |-------------------+-----------------------------------------------------| | MIXED_BG | Allocated metadata region will be write holes for | | | data writes | 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>
121 lines
2.9 KiB
C
121 lines
2.9 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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#include <linux/blkdev.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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u64 max_zone_append_size;
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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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int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info);
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int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info);
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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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static inline int btrfs_check_zoned_mode(const struct btrfs_fs_info *fs_info)
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{
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if (!btrfs_is_zoned(fs_info))
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return 0;
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btrfs_err(fs_info, "zoned block devices support is not enabled");
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return -EOPNOTSUPP;
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}
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static inline int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info)
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{
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return 0;
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}
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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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static inline bool btrfs_check_device_zone_type(const struct btrfs_fs_info *fs_info,
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struct block_device *bdev)
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{
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u64 zone_size;
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if (btrfs_is_zoned(fs_info)) {
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zone_size = bdev_zone_sectors(bdev) << SECTOR_SHIFT;
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/* Do not allow non-zoned device */
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return bdev_is_zoned(bdev) && fs_info->zone_size == zone_size;
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}
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/* Do not allow Host Manged zoned device */
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return bdev_zoned_model(bdev) != BLK_ZONED_HM;
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}
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#endif
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