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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LIBXFS_ZONES_H
#define _LIBXFS_ZONES_H
struct xfs_rtgroup;
/*
* In order to guarantee forward progress for GC we need to reserve at least
* two zones: one that will be used for moving data into and one spare zone
* making sure that we have enough space to relocate a nearly-full zone.
* To allow for slightly sloppy accounting for when we need to reserve the
* second zone, we actually reserve three as that is easier than doing fully
* accurate bookkeeping.
*/
#define XFS_GC_ZONES 3U
/*
* In addition we need two zones for user writes, one open zone for writing
* and one to still have available blocks without resetting the open zone
* when data in the open zone has been freed.
*/
#define XFS_RESERVED_ZONES (XFS_GC_ZONES + 1)
#define XFS_MIN_ZONES (XFS_RESERVED_ZONES + 1)
/*
* Always keep one zone out of the general open zone pool to allow for GC to
* happen while other writers are waiting for free space.
*/
#define XFS_OPEN_GC_ZONES 1U
#define XFS_MIN_OPEN_ZONES (XFS_OPEN_GC_ZONES + 1U)
bool xfs_zone_validate(struct blk_zone *zone, struct xfs_rtgroup *rtg,
xfs_rgblock_t *write_pointer);
#endif /* _LIBXFS_ZONES_H */
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