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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _XFS_ZONE_PRIV_H
#define _XFS_ZONE_PRIV_H
struct xfs_open_zone {
/*
* Entry in the open zone list and refcount. Protected by
* zi_open_zones_lock in struct xfs_zone_info.
*/
struct list_head oz_entry;
atomic_t oz_ref;
/*
* oz_write_pointer is the write pointer at which space is handed out
* for conventional zones, or simple the count of blocks handed out
* so far for sequential write required zones and is protected by
* oz_alloc_lock/
*/
spinlock_t oz_alloc_lock;
xfs_rgblock_t oz_write_pointer;
/*
* oz_written is the number of blocks for which we've received a
* write completion. oz_written must always be <= oz_write_pointer
* and is protected by the ILOCK of the rmap inode.
*/
xfs_rgblock_t oz_written;
/*
* Write hint (data temperature) assigned to this zone, or
* WRITE_LIFE_NOT_SET if none was set.
*/
enum rw_hint oz_write_hint;
/*
* Is this open zone used for garbage collection? There can only be a
* single open GC zone, which is pointed to by zi_open_gc_zone in
* struct xfs_zone_info. Constant over the life time of an open zone.
*/
bool oz_is_gc;
/*
* Pointer to the RT groups structure for this open zone. Constant over
* the life time of an open zone.
*/
struct xfs_rtgroup *oz_rtg;
};
/*
* Number of bitmap buckets to track reclaimable zones. There are 10 buckets
* so that each 10% of the usable capacity get their own bucket and GC can
* only has to walk the bitmaps of the lesser used zones if there are any.
*/
#define XFS_ZONE_USED_BUCKETS 10u
struct xfs_zone_info {
/*
* List of pending space reservations:
*/
spinlock_t zi_reservation_lock;
struct list_head zi_reclaim_reservations;
/*
* List and number of open zones:
*/
spinlock_t zi_open_zones_lock;
struct list_head zi_open_zones;
unsigned int zi_nr_open_zones;
/*
* Free zone search cursor and number of free zones:
*/
unsigned long zi_free_zone_cursor;
atomic_t zi_nr_free_zones;
/*
* Wait queue to wait for free zones or open zone resources to become
* available:
*/
wait_queue_head_t zi_zone_wait;
/*
* Pointer to the GC thread, and the current open zone used by GC
* (if any).
*
* zi_open_gc_zone is mostly private to the GC thread, but can be read
* for debugging from other threads, in which case zi_open_zones_lock
* must be taken to access it.
*/
struct task_struct *zi_gc_thread;
struct xfs_open_zone *zi_open_gc_zone;
/*
* List of zones that need a reset:
*/
spinlock_t zi_reset_list_lock;
struct xfs_group *zi_reset_list;
/*
* A set of bitmaps to bucket-sort reclaimable zones by used blocks to help
* garbage collection to quickly find the best candidate for reclaim.
*/
spinlock_t zi_used_buckets_lock;
unsigned int zi_used_bucket_entries[XFS_ZONE_USED_BUCKETS];
unsigned long *zi_used_bucket_bitmap[XFS_ZONE_USED_BUCKETS];
};
struct xfs_open_zone *xfs_open_zone(struct xfs_mount *mp,
enum rw_hint write_hint, bool is_gc);
int xfs_zone_gc_reset_sync(struct xfs_rtgroup *rtg);
bool xfs_zoned_need_gc(struct xfs_mount *mp);
int xfs_zone_gc_mount(struct xfs_mount *mp);
void xfs_zone_gc_unmount(struct xfs_mount *mp);
void xfs_zoned_resv_wake_all(struct xfs_mount *mp);
#endif /* _XFS_ZONE_PRIV_H */
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