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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#ifndef __XFS_ALLOC_H__
7#define __XFS_ALLOC_H__
8
9struct xfs_buf;
10struct xfs_btree_cur;
11struct xfs_mount;
12struct xfs_perag;
13struct xfs_trans;
14
15extern struct workqueue_struct *xfs_alloc_wq;
16
17unsigned int xfs_agfl_size(struct xfs_mount *mp);
18
19/*
20 * Flags for xfs_alloc_fix_freelist.
21 */
22#define XFS_ALLOC_FLAG_TRYLOCK (1U << 0) /* use trylock for buffer locking */
23#define XFS_ALLOC_FLAG_FREEING (1U << 1) /* indicate caller is freeing extents*/
24#define XFS_ALLOC_FLAG_NORMAP (1U << 2) /* don't modify the rmapbt */
25#define XFS_ALLOC_FLAG_NOSHRINK (1U << 3) /* don't shrink the freelist */
26#define XFS_ALLOC_FLAG_CHECK (1U << 4) /* test only, don't modify args */
27#define XFS_ALLOC_FLAG_TRYFLUSH (1U << 5) /* don't wait in busy extent flush */
28
29/*
30 * Argument structure for xfs_alloc routines.
31 * This is turned into a structure to avoid having 20 arguments passed
32 * down several levels of the stack.
33 */
34typedef struct xfs_alloc_arg {
35 struct xfs_trans *tp; /* transaction pointer */
36 struct xfs_mount *mp; /* file system mount point */
37 struct xfs_buf *agbp; /* buffer for a.g. freelist header */
38 struct xfs_perag *pag; /* per-ag struct for this agno */
39 xfs_fsblock_t fsbno; /* file system block number */
40 xfs_agnumber_t agno; /* allocation group number */
41 xfs_agblock_t agbno; /* allocation group-relative block # */
42 xfs_extlen_t minlen; /* minimum size of extent */
43 xfs_extlen_t maxlen; /* maximum size of extent */
44 xfs_extlen_t mod; /* mod value for extent size */
45 xfs_extlen_t prod; /* prod value for extent size */
46 xfs_extlen_t minleft; /* min blocks must be left after us */
47 xfs_extlen_t total; /* total blocks needed in xaction */
48 xfs_extlen_t alignment; /* align answer to multiple of this */
49 xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */
50 xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */
51 xfs_agblock_t max_agbno; /* ... */
52 xfs_extlen_t len; /* output: actual size of extent */
53 int datatype; /* mask defining data type treatment */
54 char wasdel; /* set if allocation was prev delayed */
55 char wasfromfl; /* set if allocation is from freelist */
56 bool alloc_minlen_only; /* allocate exact minlen extent */
57 struct xfs_owner_info oinfo; /* owner of blocks being allocated */
58 enum xfs_ag_resv_type resv; /* block reservation to use */
59} xfs_alloc_arg_t;
60
61/*
62 * Defines for datatype
63 */
64#define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/
65#define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */
66#define XFS_ALLOC_NOBUSY (1 << 2)/* Busy extents not allowed */
67
68/* freespace limit calculations */
69unsigned int xfs_alloc_set_aside(struct xfs_mount *mp);
70unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp);
71
72xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag,
73 xfs_extlen_t need, xfs_extlen_t reserved);
74unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp,
75 struct xfs_perag *pag);
76int xfs_alloc_get_freelist(struct xfs_perag *pag, struct xfs_trans *tp,
77 struct xfs_buf *agfbp, xfs_agblock_t *bnop, int btreeblk);
78int xfs_alloc_put_freelist(struct xfs_perag *pag, struct xfs_trans *tp,
79 struct xfs_buf *agfbp, struct xfs_buf *agflbp,
80 xfs_agblock_t bno, int btreeblk);
81int xfs_free_ag_extent(struct xfs_trans *tp, struct xfs_buf *agbp,
82 xfs_agblock_t bno, xfs_extlen_t len,
83 const struct xfs_owner_info *oinfo, enum xfs_ag_resv_type type);
84
85/*
86 * Compute and fill in value of m_alloc_maxlevels.
87 */
88void
89xfs_alloc_compute_maxlevels(
90 struct xfs_mount *mp); /* file system mount structure */
91
92/*
93 * Log the given fields from the agf structure.
94 */
95void
96xfs_alloc_log_agf(
97 struct xfs_trans *tp, /* transaction pointer */
98 struct xfs_buf *bp, /* buffer for a.g. freelist header */
99 uint32_t fields);/* mask of fields to be logged (XFS_AGF_...) */
100
101/*
102 * Allocate an extent anywhere in the specific AG given. If there is no
103 * space matching the requirements in that AG, then the allocation will fail.
104 */
105int xfs_alloc_vextent_this_ag(struct xfs_alloc_arg *args, xfs_agnumber_t agno);
106
107/*
108 * Allocate an extent as close to the target as possible. If there are not
109 * viable candidates in the AG, then fail the allocation.
110 */
111int xfs_alloc_vextent_near_bno(struct xfs_alloc_arg *args,
112 xfs_fsblock_t target);
113
114/*
115 * Allocate an extent exactly at the target given. If this is not possible
116 * then the allocation fails.
117 */
118int xfs_alloc_vextent_exact_bno(struct xfs_alloc_arg *args,
119 xfs_fsblock_t target);
120
121/*
122 * Best effort full filesystem allocation scan.
123 *
124 * Locality aware allocation will be attempted in the initial AG, but on failure
125 * non-localised attempts will be made. The AGs are constrained by previous
126 * allocations in the current transaction. Two passes will be made - the first
127 * non-blocking, the second blocking.
128 */
129int xfs_alloc_vextent_start_ag(struct xfs_alloc_arg *args,
130 xfs_fsblock_t target);
131
132/*
133 * Iterate from the AG indicated from args->fsbno through to the end of the
134 * filesystem attempting blocking allocation. This is for use in last
135 * resort allocation attempts when everything else has failed.
136 */
137int xfs_alloc_vextent_first_ag(struct xfs_alloc_arg *args,
138 xfs_fsblock_t target);
139
140/*
141 * Free an extent.
142 */
143int /* error */
144__xfs_free_extent(
145 struct xfs_trans *tp, /* transaction pointer */
146 struct xfs_perag *pag,
147 xfs_agblock_t agbno,
148 xfs_extlen_t len, /* length of extent */
149 const struct xfs_owner_info *oinfo, /* extent owner */
150 enum xfs_ag_resv_type type, /* block reservation type */
151 bool skip_discard);
152
153static inline int
154xfs_free_extent(
155 struct xfs_trans *tp,
156 struct xfs_perag *pag,
157 xfs_agblock_t agbno,
158 xfs_extlen_t len,
159 const struct xfs_owner_info *oinfo,
160 enum xfs_ag_resv_type type)
161{
162 return __xfs_free_extent(tp, pag, agbno, len, oinfo, type, false);
163}
164
165int /* error */
166xfs_alloc_lookup_le(
167 struct xfs_btree_cur *cur, /* btree cursor */
168 xfs_agblock_t bno, /* starting block of extent */
169 xfs_extlen_t len, /* length of extent */
170 int *stat); /* success/failure */
171
172int /* error */
173xfs_alloc_lookup_ge(
174 struct xfs_btree_cur *cur, /* btree cursor */
175 xfs_agblock_t bno, /* starting block of extent */
176 xfs_extlen_t len, /* length of extent */
177 int *stat); /* success/failure */
178
179int /* error */
180xfs_alloc_get_rec(
181 struct xfs_btree_cur *cur, /* btree cursor */
182 xfs_agblock_t *bno, /* output: starting block of extent */
183 xfs_extlen_t *len, /* output: length of extent */
184 int *stat); /* output: success/failure */
185
186union xfs_btree_rec;
187void xfs_alloc_btrec_to_irec(const union xfs_btree_rec *rec,
188 struct xfs_alloc_rec_incore *irec);
189xfs_failaddr_t xfs_alloc_check_irec(struct xfs_perag *pag,
190 const struct xfs_alloc_rec_incore *irec);
191
192int xfs_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags,
193 struct xfs_buf **agfbpp);
194int xfs_alloc_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags,
195 struct xfs_buf **agfbpp);
196int xfs_alloc_read_agfl(struct xfs_perag *pag, struct xfs_trans *tp,
197 struct xfs_buf **bpp);
198int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, uint32_t alloc_flags);
199int xfs_free_extent_fix_freelist(struct xfs_trans *tp, struct xfs_perag *pag,
200 struct xfs_buf **agbp);
201
202xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
203
204typedef int (*xfs_alloc_query_range_fn)(
205 struct xfs_btree_cur *cur,
206 const struct xfs_alloc_rec_incore *rec,
207 void *priv);
208
209int xfs_alloc_query_range(struct xfs_btree_cur *cur,
210 const struct xfs_alloc_rec_incore *low_rec,
211 const struct xfs_alloc_rec_incore *high_rec,
212 xfs_alloc_query_range_fn fn, void *priv);
213int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn,
214 void *priv);
215
216int xfs_alloc_has_records(struct xfs_btree_cur *cur, xfs_agblock_t bno,
217 xfs_extlen_t len, enum xbtree_recpacking *outcome);
218
219typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno,
220 void *priv);
221int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf,
222 struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv);
223
224static inline __be32 *
225xfs_buf_to_agfl_bno(
226 struct xfs_buf *bp)
227{
228 if (xfs_has_crc(bp->b_mount))
229 return bp->b_addr + sizeof(struct xfs_agfl);
230 return bp->b_addr;
231}
232
233int xfs_free_extent_later(struct xfs_trans *tp, xfs_fsblock_t bno,
234 xfs_filblks_t len, const struct xfs_owner_info *oinfo,
235 enum xfs_ag_resv_type type, unsigned int free_flags);
236
237/* Don't issue a discard for the blocks freed. */
238#define XFS_FREE_EXTENT_SKIP_DISCARD (1U << 0)
239
240/* Free blocks on the realtime device. */
241#define XFS_FREE_EXTENT_REALTIME (1U << 1)
242
243#define XFS_FREE_EXTENT_ALL_FLAGS (XFS_FREE_EXTENT_SKIP_DISCARD | \
244 XFS_FREE_EXTENT_REALTIME)
245
246/*
247 * List of extents to be free "later".
248 * The list is kept sorted on xbf_startblock.
249 */
250struct xfs_extent_free_item {
251 struct list_head xefi_list;
252 uint64_t xefi_owner;
253 xfs_fsblock_t xefi_startblock;/* starting fs block number */
254 xfs_extlen_t xefi_blockcount;/* number of blocks in extent */
255 struct xfs_group *xefi_group;
256 unsigned int xefi_flags;
257 enum xfs_ag_resv_type xefi_agresv;
258};
259
260#define XFS_EFI_SKIP_DISCARD (1U << 0) /* don't issue discard */
261#define XFS_EFI_ATTR_FORK (1U << 1) /* freeing attr fork block */
262#define XFS_EFI_BMBT_BLOCK (1U << 2) /* freeing bmap btree block */
263#define XFS_EFI_CANCELLED (1U << 3) /* dont actually free the space */
264#define XFS_EFI_REALTIME (1U << 4) /* freeing realtime extent */
265
266static inline bool xfs_efi_is_realtime(const struct xfs_extent_free_item *xefi)
267{
268 return xefi->xefi_flags & XFS_EFI_REALTIME;
269}
270
271struct xfs_alloc_autoreap {
272 struct xfs_defer_pending *dfp;
273};
274
275int xfs_alloc_schedule_autoreap(const struct xfs_alloc_arg *args,
276 unsigned int free_flags, struct xfs_alloc_autoreap *aarp);
277void xfs_alloc_cancel_autoreap(struct xfs_trans *tp,
278 struct xfs_alloc_autoreap *aarp);
279void xfs_alloc_commit_autoreap(struct xfs_trans *tp,
280 struct xfs_alloc_autoreap *aarp);
281
282extern struct kmem_cache *xfs_extfree_item_cache;
283
284int __init xfs_extfree_intent_init_cache(void);
285void xfs_extfree_intent_destroy_cache(void);
286
287xfs_failaddr_t xfs_validate_ag_length(struct xfs_buf *bp, uint32_t seqno,
288 uint32_t length);
289
290#endif /* __XFS_ALLOC_H__ */