1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (c) 2018 Red Hat, Inc.
8 #define __LIBXFS_AG_H 1
15 * Per-ag infrastructure
18 /* per-AG block reservation data structures*/
20 /* number of blocks originally reserved here */
21 xfs_extlen_t ar_orig_reserved;
22 /* number of blocks reserved here */
23 xfs_extlen_t ar_reserved;
24 /* number of blocks originally asked for */
25 xfs_extlen_t ar_asked;
29 * Per-ag incore structure, copies of information in agf and agi, to improve the
30 * performance of allocation group selection.
33 struct xfs_mount *pag_mount; /* owner filesystem */
34 xfs_agnumber_t pag_agno; /* AG this structure belongs to */
35 atomic_t pag_ref; /* passive reference count */
36 atomic_t pag_active_ref; /* active reference count */
37 wait_queue_head_t pag_active_wq;/* woken active_ref falls to zero */
38 unsigned long pag_opstate;
39 uint8_t pagf_levels[XFS_BTNUM_AGF];
40 /* # of levels in bno & cnt btree */
41 uint32_t pagf_flcount; /* count of blocks in freelist */
42 xfs_extlen_t pagf_freeblks; /* total free blocks */
43 xfs_extlen_t pagf_longest; /* longest free space */
44 uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */
45 xfs_agino_t pagi_freecount; /* number of free inodes */
46 xfs_agino_t pagi_count; /* number of allocated inodes */
49 * Inode allocation search lookup optimisation.
50 * If the pagino matches, the search for new inodes
51 * doesn't need to search the near ones again straight away
53 xfs_agino_t pagl_pagino;
54 xfs_agino_t pagl_leftrec;
55 xfs_agino_t pagl_rightrec;
57 int pagb_count; /* pagb slots in use */
58 uint8_t pagf_refcount_level; /* recount btree height */
60 /* Blocks reserved for all kinds of metadata. */
61 struct xfs_ag_resv pag_meta_resv;
62 /* Blocks reserved for the reverse mapping btree. */
63 struct xfs_ag_resv pag_rmapbt_resv;
65 /* for rcu-safe freeing */
66 struct rcu_head rcu_head;
68 /* Precalculated geometry info */
69 xfs_agblock_t block_count;
70 xfs_agblock_t min_block;
71 xfs_agino_t agino_min;
72 xfs_agino_t agino_max;
75 /* -- kernel only structures below this line -- */
78 * Bitsets of per-ag metadata that have been checked and/or are sick.
79 * Callers should hold pag_state_lock before accessing this field.
83 spinlock_t pag_state_lock;
85 spinlock_t pagb_lock; /* lock for pagb_tree */
86 struct rb_root pagb_tree; /* ordered tree of busy extents */
87 unsigned int pagb_gen; /* generation count for pagb_tree */
88 wait_queue_head_t pagb_wait; /* woken when pagb_gen changes */
90 atomic_t pagf_fstrms; /* # of filestreams active in this AG */
92 spinlock_t pag_ici_lock; /* incore inode cache lock */
93 struct radix_tree_root pag_ici_root; /* incore inode cache root */
94 int pag_ici_reclaimable; /* reclaimable inodes */
95 unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */
97 /* buffer cache index */
98 spinlock_t pag_buf_lock; /* lock for pag_buf_hash */
99 struct rhashtable pag_buf_hash;
101 /* background prealloc block trimming */
102 struct delayed_work pag_blockgc_work;
104 #endif /* __KERNEL__ */
108 * Per-AG operational state. These are atomic flag bits.
110 #define XFS_AGSTATE_AGF_INIT 0
111 #define XFS_AGSTATE_AGI_INIT 1
112 #define XFS_AGSTATE_PREFERS_METADATA 2
113 #define XFS_AGSTATE_ALLOWS_INODES 3
114 #define XFS_AGSTATE_AGFL_NEEDS_RESET 4
116 #define __XFS_AG_OPSTATE(name, NAME) \
117 static inline bool xfs_perag_ ## name (struct xfs_perag *pag) \
119 return test_bit(XFS_AGSTATE_ ## NAME, &pag->pag_opstate); \
122 __XFS_AG_OPSTATE(initialised_agf, AGF_INIT)
123 __XFS_AG_OPSTATE(initialised_agi, AGI_INIT)
124 __XFS_AG_OPSTATE(prefers_metadata, PREFERS_METADATA)
125 __XFS_AG_OPSTATE(allows_inodes, ALLOWS_INODES)
126 __XFS_AG_OPSTATE(agfl_needs_reset, AGFL_NEEDS_RESET)
128 int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t agcount,
129 xfs_rfsblock_t dcount, xfs_agnumber_t *maxagi);
130 int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno);
131 void xfs_free_perag(struct xfs_mount *mp);
133 /* Passive AG references */
134 struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno);
135 struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno,
137 void xfs_perag_put(struct xfs_perag *pag);
139 /* Active AG references */
140 struct xfs_perag *xfs_perag_grab(struct xfs_mount *, xfs_agnumber_t);
141 struct xfs_perag *xfs_perag_grab_tag(struct xfs_mount *, xfs_agnumber_t,
143 void xfs_perag_rele(struct xfs_perag *pag);
146 * Per-ag geometry infomation and validation
148 xfs_agblock_t xfs_ag_block_count(struct xfs_mount *mp, xfs_agnumber_t agno);
149 void xfs_agino_range(struct xfs_mount *mp, xfs_agnumber_t agno,
150 xfs_agino_t *first, xfs_agino_t *last);
153 xfs_verify_agbno(struct xfs_perag *pag, xfs_agblock_t agbno)
155 if (agbno >= pag->block_count)
157 if (agbno <= pag->min_block)
164 struct xfs_perag *pag,
168 if (agbno + len <= agbno)
171 if (!xfs_verify_agbno(pag, agbno))
174 return xfs_verify_agbno(pag, agbno + len - 1);
178 * Verify that an AG inode number pointer neither points outside the AG
179 * nor points at static metadata.
182 xfs_verify_agino(struct xfs_perag *pag, xfs_agino_t agino)
184 if (agino < pag->agino_min)
186 if (agino > pag->agino_max)
192 * Verify that an AG inode number pointer neither points outside the AG
193 * nor points at static metadata, or is NULLAGINO.
196 xfs_verify_agino_or_null(struct xfs_perag *pag, xfs_agino_t agino)
198 if (agino == NULLAGINO)
200 return xfs_verify_agino(pag, agino);
204 xfs_ag_contains_log(struct xfs_mount *mp, xfs_agnumber_t agno)
206 return mp->m_sb.sb_logstart > 0 &&
207 agno == XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart);
211 * Perag iteration APIs
213 static inline struct xfs_perag *
215 struct xfs_perag *pag,
216 xfs_agnumber_t *agno,
217 xfs_agnumber_t end_agno)
219 struct xfs_mount *mp = pag->pag_mount;
221 *agno = pag->pag_agno + 1;
223 while (*agno <= end_agno) {
224 pag = xfs_perag_grab(mp, *agno);
232 #define for_each_perag_range(mp, agno, end_agno, pag) \
233 for ((pag) = xfs_perag_grab((mp), (agno)); \
235 (pag) = xfs_perag_next((pag), &(agno), (end_agno)))
237 #define for_each_perag_from(mp, agno, pag) \
238 for_each_perag_range((mp), (agno), (mp)->m_sb.sb_agcount - 1, (pag))
240 #define for_each_perag(mp, agno, pag) \
242 for_each_perag_from((mp), (agno), (pag))
244 #define for_each_perag_tag(mp, agno, pag, tag) \
245 for ((agno) = 0, (pag) = xfs_perag_grab_tag((mp), 0, (tag)); \
247 (agno) = (pag)->pag_agno + 1, \
248 xfs_perag_rele(pag), \
249 (pag) = xfs_perag_grab_tag((mp), (agno), (tag)))
251 static inline struct xfs_perag *
253 struct xfs_perag *pag,
254 xfs_agnumber_t *agno,
255 xfs_agnumber_t stop_agno,
256 xfs_agnumber_t wrap_agno)
258 struct xfs_mount *mp = pag->pag_mount;
260 *agno = pag->pag_agno + 1;
262 while (*agno != stop_agno) {
263 if (*agno >= wrap_agno)
265 if (*agno == stop_agno)
268 pag = xfs_perag_grab(mp, *agno);
277 * Iterate all AGs from start_agno through wrap_agno, then 0 through
280 #define for_each_perag_wrap_at(mp, start_agno, wrap_agno, agno, pag) \
281 for ((agno) = (start_agno), (pag) = xfs_perag_grab((mp), (agno)); \
283 (pag) = xfs_perag_next_wrap((pag), &(agno), (start_agno), \
287 * Iterate all AGs from start_agno through to the end of the filesystem, then 0
288 * through (start_agno - 1).
290 #define for_each_perag_wrap(mp, start_agno, agno, pag) \
291 for_each_perag_wrap_at((mp), (start_agno), (mp)->m_sb.sb_agcount, \
295 struct aghdr_init_data {
297 xfs_agblock_t agno; /* ag to init */
298 xfs_extlen_t agsize; /* new AG size */
299 struct list_head buffer_list; /* buffer writeback list */
300 xfs_rfsblock_t nfree; /* cumulative new free space */
302 /* per header data */
303 xfs_daddr_t daddr; /* header location */
304 size_t numblks; /* size of header */
305 xfs_btnum_t type; /* type of btree root block */
308 int xfs_ag_init_headers(struct xfs_mount *mp, struct aghdr_init_data *id);
309 int xfs_ag_shrink_space(struct xfs_perag *pag, struct xfs_trans **tpp,
311 int xfs_ag_extend_space(struct xfs_perag *pag, struct xfs_trans *tp,
313 int xfs_ag_get_geometry(struct xfs_perag *pag, struct xfs_ag_geometry *ageo);
315 #endif /* __LIBXFS_AG_H */