/* 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) /* * For zoned devices that do not have a limit on the number of open zones, and * for regular devices using the zoned allocator, use the most common SMR disks * limit (128) as the default limit on the number of open zones. */ #define XFS_DEFAULT_MAX_OPEN_ZONES 128 bool xfs_zone_validate(struct blk_zone *zone, struct xfs_rtgroup *rtg, xfs_rgblock_t *write_pointer); #endif /* _LIBXFS_ZONES_H */