Line data Source code
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 :
9 : struct xfs_buf;
10 : struct xfs_btree_cur;
11 : struct xfs_mount;
12 : struct xfs_perag;
13 : struct xfs_trans;
14 :
15 : extern struct workqueue_struct *xfs_alloc_wq;
16 :
17 : unsigned 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 : */
34 : typedef 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 : struct xfs_owner_info oinfo; /* owner of blocks being allocated */
57 : enum xfs_ag_resv_type resv; /* block reservation to use */
58 : #ifdef DEBUG
59 : bool alloc_minlen_only; /* allocate exact minlen extent */
60 : #endif
61 : } xfs_alloc_arg_t;
62 :
63 : /*
64 : * Defines for datatype
65 : */
66 : #define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/
67 : #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */
68 : #define XFS_ALLOC_NOBUSY (1 << 2)/* Busy extents not allowed */
69 :
70 : /* freespace limit calculations */
71 : unsigned int xfs_alloc_set_aside(struct xfs_mount *mp);
72 : unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp);
73 :
74 : xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag,
75 : xfs_extlen_t need, xfs_extlen_t reserved);
76 : unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp,
77 : struct xfs_perag *pag);
78 : int xfs_alloc_get_freelist(struct xfs_perag *pag, struct xfs_trans *tp,
79 : struct xfs_buf *agfbp, xfs_agblock_t *bnop, int btreeblk);
80 : int xfs_alloc_put_freelist(struct xfs_perag *pag, struct xfs_trans *tp,
81 : struct xfs_buf *agfbp, struct xfs_buf *agflbp,
82 : xfs_agblock_t bno, int btreeblk);
83 :
84 : /*
85 : * Compute and fill in value of m_alloc_maxlevels.
86 : */
87 : void
88 : xfs_alloc_compute_maxlevels(
89 : struct xfs_mount *mp); /* file system mount structure */
90 :
91 : /*
92 : * Log the given fields from the agf structure.
93 : */
94 : void
95 : xfs_alloc_log_agf(
96 : struct xfs_trans *tp, /* transaction pointer */
97 : struct xfs_buf *bp, /* buffer for a.g. freelist header */
98 : uint32_t fields);/* mask of fields to be logged (XFS_AGF_...) */
99 :
100 : /*
101 : * Allocate an extent anywhere in the specific AG given. If there is no
102 : * space matching the requirements in that AG, then the allocation will fail.
103 : */
104 : int xfs_alloc_vextent_this_ag(struct xfs_alloc_arg *args, xfs_agnumber_t agno);
105 :
106 : /*
107 : * Allocate an extent as close to the target as possible. If there are not
108 : * viable candidates in the AG, then fail the allocation.
109 : */
110 : int xfs_alloc_vextent_near_bno(struct xfs_alloc_arg *args,
111 : xfs_fsblock_t target);
112 :
113 : /*
114 : * Allocate an extent exactly at the target given. If this is not possible
115 : * then the allocation fails.
116 : */
117 : int xfs_alloc_vextent_exact_bno(struct xfs_alloc_arg *args,
118 : xfs_fsblock_t target);
119 :
120 : /*
121 : * Best effort full filesystem allocation scan.
122 : *
123 : * Locality aware allocation will be attempted in the initial AG, but on failure
124 : * non-localised attempts will be made. The AGs are constrained by previous
125 : * allocations in the current transaction. Two passes will be made - the first
126 : * non-blocking, the second blocking.
127 : */
128 : int xfs_alloc_vextent_start_ag(struct xfs_alloc_arg *args,
129 : xfs_fsblock_t target);
130 :
131 : /*
132 : * Iterate from the AG indicated from args->fsbno through to the end of the
133 : * filesystem attempting blocking allocation. This is for use in last
134 : * resort allocation attempts when everything else has failed.
135 : */
136 : int xfs_alloc_vextent_first_ag(struct xfs_alloc_arg *args,
137 : xfs_fsblock_t target);
138 :
139 : /*
140 : * Free an extent.
141 : */
142 : int /* error */
143 : __xfs_free_extent(
144 : struct xfs_trans *tp, /* transaction pointer */
145 : struct xfs_perag *pag,
146 : xfs_agblock_t agbno,
147 : xfs_extlen_t len, /* length of extent */
148 : const struct xfs_owner_info *oinfo, /* extent owner */
149 : enum xfs_ag_resv_type type, /* block reservation type */
150 : bool skip_discard);
151 :
152 : static inline int
153 : xfs_free_extent(
154 : struct xfs_trans *tp,
155 : struct xfs_perag *pag,
156 : xfs_agblock_t agbno,
157 : xfs_extlen_t len,
158 : const struct xfs_owner_info *oinfo,
159 : enum xfs_ag_resv_type type)
160 : {
161 28 : return __xfs_free_extent(tp, pag, agbno, len, oinfo, type, false);
162 : }
163 :
164 : int /* error */
165 : xfs_alloc_lookup_le(
166 : struct xfs_btree_cur *cur, /* btree cursor */
167 : xfs_agblock_t bno, /* starting block of extent */
168 : xfs_extlen_t len, /* length of extent */
169 : int *stat); /* success/failure */
170 :
171 : int /* error */
172 : xfs_alloc_lookup_ge(
173 : struct xfs_btree_cur *cur, /* btree cursor */
174 : xfs_agblock_t bno, /* starting block of extent */
175 : xfs_extlen_t len, /* length of extent */
176 : int *stat); /* success/failure */
177 :
178 : int /* error */
179 : xfs_alloc_get_rec(
180 : struct xfs_btree_cur *cur, /* btree cursor */
181 : xfs_agblock_t *bno, /* output: starting block of extent */
182 : xfs_extlen_t *len, /* output: length of extent */
183 : int *stat); /* output: success/failure */
184 :
185 : union xfs_btree_rec;
186 : void xfs_alloc_btrec_to_irec(const union xfs_btree_rec *rec,
187 : struct xfs_alloc_rec_incore *irec);
188 : xfs_failaddr_t xfs_alloc_check_perag_irec(struct xfs_perag *pag,
189 : const struct xfs_alloc_rec_incore *irec);
190 : xfs_failaddr_t xfs_alloc_check_irec(struct xfs_btree_cur *cur,
191 : const struct xfs_alloc_rec_incore *irec);
192 :
193 : int xfs_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags,
194 : struct xfs_buf **agfbpp);
195 : int xfs_alloc_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags,
196 : struct xfs_buf **agfbpp);
197 : int xfs_alloc_read_agfl(struct xfs_perag *pag, struct xfs_trans *tp,
198 : struct xfs_buf **bpp);
199 : int xfs_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t,
200 : struct xfs_buf *, struct xfs_owner_info *);
201 : int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, uint32_t alloc_flags);
202 : int xfs_free_extent_fix_freelist(struct xfs_trans *tp, struct xfs_perag *pag,
203 : struct xfs_buf **agbp);
204 :
205 : xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
206 :
207 : typedef int (*xfs_alloc_query_range_fn)(
208 : struct xfs_btree_cur *cur,
209 : const struct xfs_alloc_rec_incore *rec,
210 : void *priv);
211 :
212 : int xfs_alloc_query_range(struct xfs_btree_cur *cur,
213 : const struct xfs_alloc_rec_incore *low_rec,
214 : const struct xfs_alloc_rec_incore *high_rec,
215 : xfs_alloc_query_range_fn fn, void *priv);
216 : int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn,
217 : void *priv);
218 :
219 : int xfs_alloc_has_records(struct xfs_btree_cur *cur, xfs_agblock_t bno,
220 : xfs_extlen_t len, enum xbtree_recpacking *outcome);
221 :
222 : typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno,
223 : void *priv);
224 : int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf,
225 : struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv);
226 :
227 : static inline __be32 *
228 : xfs_buf_to_agfl_bno(
229 : struct xfs_buf *bp)
230 : {
231 60365561 : if (xfs_has_crc(bp->b_mount))
232 60363274 : return bp->b_addr + sizeof(struct xfs_agfl);
233 2285 : return bp->b_addr;
234 : }
235 :
236 : int xfs_free_extent_later(struct xfs_trans *tp, xfs_fsblock_t bno,
237 : xfs_filblks_t len, const struct xfs_owner_info *oinfo,
238 : enum xfs_ag_resv_type type, unsigned int flags);
239 :
240 : /* Don't issue a discard for the blocks freed. */
241 : #define XFS_FREE_EXTENT_SKIP_DISCARD (1U << 0)
242 :
243 : /* Free blocks on the realtime device. */
244 : #define XFS_FREE_EXTENT_REALTIME (1U << 1)
245 :
246 : #define XFS_FREE_EXTENT_ALL_FLAGS (XFS_FREE_EXTENT_SKIP_DISCARD | \
247 : XFS_FREE_EXTENT_REALTIME)
248 :
249 : /*
250 : * List of extents to be free "later".
251 : * The list is kept sorted on xbf_startblock.
252 : */
253 : struct xfs_extent_free_item {
254 : struct list_head xefi_list;
255 : uint64_t xefi_owner;
256 : xfs_fsblock_t xefi_startblock;/* starting fs block number */
257 : xfs_extlen_t xefi_blockcount;/* number of blocks in extent */
258 : union {
259 : struct xfs_perag *xefi_pag;
260 : struct xfs_rtgroup *xefi_rtg;
261 : };
262 : unsigned int xefi_flags;
263 : enum xfs_ag_resv_type xefi_agresv;
264 : };
265 :
266 : void xfs_extent_free_get_group(struct xfs_mount *mp,
267 : struct xfs_extent_free_item *xefi);
268 :
269 : #define XFS_EFI_SKIP_DISCARD (1U << 0) /* don't issue discard */
270 : #define XFS_EFI_ATTR_FORK (1U << 1) /* freeing attr fork block */
271 : #define XFS_EFI_BMBT_BLOCK (1U << 2) /* freeing bmap btree block */
272 : #define XFS_EFI_REALTIME (1U << 3) /* freeing realtime extent */
273 :
274 : static inline bool xfs_efi_is_realtime(const struct xfs_extent_free_item *xefi)
275 : {
276 348585261 : return xefi->xefi_flags & XFS_EFI_REALTIME;
277 : }
278 :
279 : extern struct kmem_cache *xfs_extfree_item_cache;
280 :
281 : int __init xfs_extfree_intent_init_cache(void);
282 : void xfs_extfree_intent_destroy_cache(void);
283 :
284 : xfs_failaddr_t xfs_validate_ag_length(struct xfs_buf *bp, uint32_t seqno,
285 : uint32_t length);
286 : int xfs_alloc_find_freesp(struct xfs_trans *tp, struct xfs_perag *pag,
287 : xfs_agblock_t *agbno, xfs_agblock_t end_agbno,
288 : xfs_extlen_t *len);
289 :
290 : #endif /* __XFS_ALLOC_H__ */
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