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diff --git a/fs/xfs/libxfs/xfs_ag.h b/fs/xfs/libxfs/xfs_ag.h
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+++ b/fs/xfs/libxfs/xfs_ag.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2018 Red Hat, Inc.
+ * All rights reserved.
+ */
+
+#ifndef __LIBXFS_AG_H
+#define __LIBXFS_AG_H 1
+
+struct xfs_mount;
+struct xfs_trans;
+struct xfs_perag;
+
+/*
+ * Per-ag infrastructure
+ */
+
+/* per-AG block reservation data structures*/
+struct xfs_ag_resv {
+ /* number of blocks originally reserved here */
+ xfs_extlen_t ar_orig_reserved;
+ /* number of blocks reserved here */
+ xfs_extlen_t ar_reserved;
+ /* number of blocks originally asked for */
+ xfs_extlen_t ar_asked;
+};
+
+/*
+ * Per-ag incore structure, copies of information in agf and agi, to improve the
+ * performance of allocation group selection.
+ */
+struct xfs_perag {
+ struct xfs_mount *pag_mount; /* owner filesystem */
+ xfs_agnumber_t pag_agno; /* AG this structure belongs to */
+ atomic_t pag_ref; /* passive reference count */
+ atomic_t pag_active_ref; /* active reference count */
+ wait_queue_head_t pag_active_wq;/* woken active_ref falls to zero */
+ unsigned long pag_opstate;
+ uint8_t pagf_levels[XFS_BTNUM_AGF];
+ /* # of levels in bno & cnt btree */
+ uint32_t pagf_flcount; /* count of blocks in freelist */
+ xfs_extlen_t pagf_freeblks; /* total free blocks */
+ xfs_extlen_t pagf_longest; /* longest free space */
+ uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */
+ xfs_agino_t pagi_freecount; /* number of free inodes */
+ xfs_agino_t pagi_count; /* number of allocated inodes */
+
+ /*
+ * Inode allocation search lookup optimisation.
+ * If the pagino matches, the search for new inodes
+ * doesn't need to search the near ones again straight away
+ */
+ xfs_agino_t pagl_pagino;
+ xfs_agino_t pagl_leftrec;
+ xfs_agino_t pagl_rightrec;
+
+ int pagb_count; /* pagb slots in use */
+ uint8_t pagf_refcount_level; /* recount btree height */
+
+ /* Blocks reserved for all kinds of metadata. */
+ struct xfs_ag_resv pag_meta_resv;
+ /* Blocks reserved for the reverse mapping btree. */
+ struct xfs_ag_resv pag_rmapbt_resv;
+
+ /* for rcu-safe freeing */
+ struct rcu_head rcu_head;
+
+ /* Precalculated geometry info */
+ xfs_agblock_t block_count;
+ xfs_agblock_t min_block;
+ xfs_agino_t agino_min;
+ xfs_agino_t agino_max;
+
+#ifdef __KERNEL__
+ /* -- kernel only structures below this line -- */
+
+ /*
+ * Bitsets of per-ag metadata that have been checked and/or are sick.
+ * Callers should hold pag_state_lock before accessing this field.
+ */
+ uint16_t pag_checked;
+ uint16_t pag_sick;
+ spinlock_t pag_state_lock;
+
+ spinlock_t pagb_lock; /* lock for pagb_tree */
+ struct rb_root pagb_tree; /* ordered tree of busy extents */
+ unsigned int pagb_gen; /* generation count for pagb_tree */
+ wait_queue_head_t pagb_wait; /* woken when pagb_gen changes */
+
+ atomic_t pagf_fstrms; /* # of filestreams active in this AG */
+
+ spinlock_t pag_ici_lock; /* incore inode cache lock */
+ struct radix_tree_root pag_ici_root; /* incore inode cache root */
+ int pag_ici_reclaimable; /* reclaimable inodes */
+ unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */
+
+ /* buffer cache index */
+ spinlock_t pag_buf_lock; /* lock for pag_buf_hash */
+ struct rhashtable pag_buf_hash;
+
+ /* background prealloc block trimming */
+ struct delayed_work pag_blockgc_work;
+
+ /*
+ * We use xfs_drain to track the number of deferred log intent items
+ * that have been queued (but not yet processed) so that waiters (e.g.
+ * scrub) will not lock resources when other threads are in the middle
+ * of processing a chain of intent items only to find momentary
+ * inconsistencies.
+ */
+ struct xfs_defer_drain pag_intents_drain;
+#endif /* __KERNEL__ */
+};
+
+/*
+ * Per-AG operational state. These are atomic flag bits.
+ */
+#define XFS_AGSTATE_AGF_INIT 0
+#define XFS_AGSTATE_AGI_INIT 1
+#define XFS_AGSTATE_PREFERS_METADATA 2
+#define XFS_AGSTATE_ALLOWS_INODES 3
+#define XFS_AGSTATE_AGFL_NEEDS_RESET 4
+
+#define __XFS_AG_OPSTATE(name, NAME) \
+static inline bool xfs_perag_ ## name (struct xfs_perag *pag) \
+{ \
+ return test_bit(XFS_AGSTATE_ ## NAME, &pag->pag_opstate); \
+}
+
+__XFS_AG_OPSTATE(initialised_agf, AGF_INIT)
+__XFS_AG_OPSTATE(initialised_agi, AGI_INIT)
+__XFS_AG_OPSTATE(prefers_metadata, PREFERS_METADATA)
+__XFS_AG_OPSTATE(allows_inodes, ALLOWS_INODES)
+__XFS_AG_OPSTATE(agfl_needs_reset, AGFL_NEEDS_RESET)
+
+int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t agcount,
+ xfs_rfsblock_t dcount, xfs_agnumber_t *maxagi);
+int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno);
+void xfs_free_perag(struct xfs_mount *mp);
+
+/* Passive AG references */
+struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno);
+struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno,
+ unsigned int tag);
+struct xfs_perag *xfs_perag_hold(struct xfs_perag *pag);
+void xfs_perag_put(struct xfs_perag *pag);
+
+/* Active AG references */
+struct xfs_perag *xfs_perag_grab(struct xfs_mount *, xfs_agnumber_t);
+struct xfs_perag *xfs_perag_grab_tag(struct xfs_mount *, xfs_agnumber_t,
+ int tag);
+void xfs_perag_rele(struct xfs_perag *pag);
+
+/*
+ * Per-ag geometry infomation and validation
+ */
+xfs_agblock_t xfs_ag_block_count(struct xfs_mount *mp, xfs_agnumber_t agno);
+void xfs_agino_range(struct xfs_mount *mp, xfs_agnumber_t agno,
+ xfs_agino_t *first, xfs_agino_t *last);
+
+static inline bool
+xfs_verify_agbno(struct xfs_perag *pag, xfs_agblock_t agbno)
+{
+ if (agbno >= pag->block_count)
+ return false;
+ if (agbno <= pag->min_block)
+ return false;
+ return true;
+}
+
+static inline bool
+xfs_verify_agbext(
+ struct xfs_perag *pag,
+ xfs_agblock_t agbno,
+ xfs_agblock_t len)
+{
+ if (agbno + len <= agbno)
+ return false;
+
+ if (!xfs_verify_agbno(pag, agbno))
+ return false;
+
+ return xfs_verify_agbno(pag, agbno + len - 1);
+}
+
+/*
+ * Verify that an AG inode number pointer neither points outside the AG
+ * nor points at static metadata.
+ */
+static inline bool
+xfs_verify_agino(struct xfs_perag *pag, xfs_agino_t agino)
+{
+ if (agino < pag->agino_min)
+ return false;
+ if (agino > pag->agino_max)
+ return false;
+ return true;
+}
+
+/*
+ * Verify that an AG inode number pointer neither points outside the AG
+ * nor points at static metadata, or is NULLAGINO.
+ */
+static inline bool
+xfs_verify_agino_or_null(struct xfs_perag *pag, xfs_agino_t agino)
+{
+ if (agino == NULLAGINO)
+ return true;
+ return xfs_verify_agino(pag, agino);
+}
+
+static inline bool
+xfs_ag_contains_log(struct xfs_mount *mp, xfs_agnumber_t agno)
+{
+ return mp->m_sb.sb_logstart > 0 &&
+ agno == XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart);
+}
+
+/*
+ * Perag iteration APIs
+ */
+static inline struct xfs_perag *
+xfs_perag_next(
+ struct xfs_perag *pag,
+ xfs_agnumber_t *agno,
+ xfs_agnumber_t end_agno)
+{
+ struct xfs_mount *mp = pag->pag_mount;
+
+ *agno = pag->pag_agno + 1;
+ xfs_perag_rele(pag);
+ while (*agno <= end_agno) {
+ pag = xfs_perag_grab(mp, *agno);
+ if (pag)
+ return pag;
+ (*agno)++;
+ }
+ return NULL;
+}
+
+#define for_each_perag_range(mp, agno, end_agno, pag) \
+ for ((pag) = xfs_perag_grab((mp), (agno)); \
+ (pag) != NULL; \
+ (pag) = xfs_perag_next((pag), &(agno), (end_agno)))
+
+#define for_each_perag_from(mp, agno, pag) \
+ for_each_perag_range((mp), (agno), (mp)->m_sb.sb_agcount - 1, (pag))
+
+#define for_each_perag(mp, agno, pag) \
+ (agno) = 0; \
+ for_each_perag_from((mp), (agno), (pag))
+
+#define for_each_perag_tag(mp, agno, pag, tag) \
+ for ((agno) = 0, (pag) = xfs_perag_grab_tag((mp), 0, (tag)); \
+ (pag) != NULL; \
+ (agno) = (pag)->pag_agno + 1, \
+ xfs_perag_rele(pag), \
+ (pag) = xfs_perag_grab_tag((mp), (agno), (tag)))
+
+static inline struct xfs_perag *
+xfs_perag_next_wrap(
+ struct xfs_perag *pag,
+ xfs_agnumber_t *agno,
+ xfs_agnumber_t stop_agno,
+ xfs_agnumber_t restart_agno,
+ xfs_agnumber_t wrap_agno)
+{
+ struct xfs_mount *mp = pag->pag_mount;
+
+ *agno = pag->pag_agno + 1;
+ xfs_perag_rele(pag);
+ while (*agno != stop_agno) {
+ if (*agno >= wrap_agno) {
+ if (restart_agno >= stop_agno)
+ break;
+ *agno = restart_agno;
+ }
+
+ pag = xfs_perag_grab(mp, *agno);
+ if (pag)
+ return pag;
+ (*agno)++;
+ }
+ return NULL;
+}
+
+/*
+ * Iterate all AGs from start_agno through wrap_agno, then restart_agno through
+ * (start_agno - 1).
+ */
+#define for_each_perag_wrap_range(mp, start_agno, restart_agno, wrap_agno, agno, pag) \
+ for ((agno) = (start_agno), (pag) = xfs_perag_grab((mp), (agno)); \
+ (pag) != NULL; \
+ (pag) = xfs_perag_next_wrap((pag), &(agno), (start_agno), \
+ (restart_agno), (wrap_agno)))
+/*
+ * Iterate all AGs from start_agno through wrap_agno, then 0 through
+ * (start_agno - 1).
+ */
+#define for_each_perag_wrap_at(mp, start_agno, wrap_agno, agno, pag) \
+ for_each_perag_wrap_range((mp), (start_agno), 0, (wrap_agno), (agno), (pag))
+
+/*
+ * Iterate all AGs from start_agno through to the end of the filesystem, then 0
+ * through (start_agno - 1).
+ */
+#define for_each_perag_wrap(mp, start_agno, agno, pag) \
+ for_each_perag_wrap_at((mp), (start_agno), (mp)->m_sb.sb_agcount, \
+ (agno), (pag))
+
+
+struct aghdr_init_data {
+ /* per ag data */
+ xfs_agblock_t agno; /* ag to init */
+ xfs_extlen_t agsize; /* new AG size */
+ struct list_head buffer_list; /* buffer writeback list */
+ xfs_rfsblock_t nfree; /* cumulative new free space */
+
+ /* per header data */
+ xfs_daddr_t daddr; /* header location */
+ size_t numblks; /* size of header */
+ xfs_btnum_t type; /* type of btree root block */
+};
+
+int xfs_ag_init_headers(struct xfs_mount *mp, struct aghdr_init_data *id);
+int xfs_ag_shrink_space(struct xfs_perag *pag, struct xfs_trans **tpp,
+ xfs_extlen_t delta);
+int xfs_ag_extend_space(struct xfs_perag *pag, struct xfs_trans *tp,
+ xfs_extlen_t len);
+int xfs_ag_get_geometry(struct xfs_perag *pag, struct xfs_ag_geometry *ageo);
+
+#endif /* __LIBXFS_AG_H */