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