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 * Freespace allocation types. Argument to xfs_alloc_[v]extent.
21 */
22 #define XFS_ALLOCTYPE_FIRST_AG 0x02 /* ... start at ag 0 */
23 #define XFS_ALLOCTYPE_THIS_AG 0x08 /* anywhere in this a.g. */
24 #define XFS_ALLOCTYPE_START_BNO 0x10 /* near this block else anywhere */
25 #define XFS_ALLOCTYPE_NEAR_BNO 0x20 /* in this a.g. and near this block */
26 #define XFS_ALLOCTYPE_THIS_BNO 0x40 /* at exactly this block */
27
28 /* this should become an enum again when the tracing code is fixed */
29 typedef unsigned int xfs_alloctype_t;
30
31 #define XFS_ALLOC_TYPES \
32 { XFS_ALLOCTYPE_FIRST_AG, "FIRST_AG" }, \
33 { XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \
34 { XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \
35 { XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \
36 { XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" }
37
38 /*
39 * Flags for xfs_alloc_fix_freelist.
40 */
41 #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */
42 #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/
43 #define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */
44 #define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */
45 #define XFS_ALLOC_FLAG_CHECK 0x00000010 /* test only, don't modify args */
46
47 /*
48 * Argument structure for xfs_alloc routines.
49 * This is turned into a structure to avoid having 20 arguments passed
50 * down several levels of the stack.
51 */
52 typedef struct xfs_alloc_arg {
53 struct xfs_trans *tp; /* transaction pointer */
54 struct xfs_mount *mp; /* file system mount point */
55 struct xfs_buf *agbp; /* buffer for a.g. freelist header */
56 struct xfs_perag *pag; /* per-ag struct for this agno */
57 xfs_fsblock_t fsbno; /* file system block number */
58 xfs_agnumber_t agno; /* allocation group number */
59 xfs_agblock_t agbno; /* allocation group-relative block # */
60 xfs_extlen_t minlen; /* minimum size of extent */
61 xfs_extlen_t maxlen; /* maximum size of extent */
62 xfs_extlen_t mod; /* mod value for extent size */
63 xfs_extlen_t prod; /* prod value for extent size */
64 xfs_extlen_t minleft; /* min blocks must be left after us */
65 xfs_extlen_t total; /* total blocks needed in xaction */
66 xfs_extlen_t alignment; /* align answer to multiple of this */
67 xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */
68 xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */
69 xfs_agblock_t max_agbno; /* ... */
70 xfs_extlen_t len; /* output: actual size of extent */
71 xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */
72 xfs_alloctype_t otype; /* original allocation type */
73 int datatype; /* mask defining data type treatment */
74 char wasdel; /* set if allocation was prev delayed */
75 char wasfromfl; /* set if allocation is from freelist */
76 struct xfs_owner_info oinfo; /* owner of blocks being allocated */
77 enum xfs_ag_resv_type resv; /* block reservation to use */
78 #ifdef DEBUG
79 bool alloc_minlen_only; /* allocate exact minlen extent */
80 #endif
81 } xfs_alloc_arg_t;
82
83 /*
84 * Defines for datatype
85 */
86 #define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/
87 #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */
88 #define XFS_ALLOC_NOBUSY (1 << 2)/* Busy extents not allowed */
89
90 /* freespace limit calculations */
91 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp);
92 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp);
93
94 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag,
95 xfs_extlen_t need, xfs_extlen_t reserved);
96 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp,
97 struct xfs_perag *pag);
98 int xfs_alloc_get_freelist(struct xfs_perag *pag, struct xfs_trans *tp,
99 struct xfs_buf *agfbp, xfs_agblock_t *bnop, int btreeblk);
100 int xfs_alloc_put_freelist(struct xfs_perag *pag, struct xfs_trans *tp,
101 struct xfs_buf *agfbp, struct xfs_buf *agflbp,
102 xfs_agblock_t bno, int btreeblk);
103
104 /*
105 * Compute and fill in value of m_alloc_maxlevels.
106 */
107 void
108 xfs_alloc_compute_maxlevels(
109 struct xfs_mount *mp); /* file system mount structure */
110
111 /*
112 * Log the given fields from the agf structure.
113 */
114 void
115 xfs_alloc_log_agf(
116 struct xfs_trans *tp, /* transaction pointer */
117 struct xfs_buf *bp, /* buffer for a.g. freelist header */
118 uint32_t fields);/* mask of fields to be logged (XFS_AGF_...) */
119
120 /*
121 * Allocate an extent (variable-size).
122 */
123 int /* error */
124 xfs_alloc_vextent(
125 xfs_alloc_arg_t *args); /* allocation argument structure */
126
127 /*
128 * Free an extent.
129 */
130 int /* error */
131 __xfs_free_extent(
132 struct xfs_trans *tp, /* transaction pointer */
133 xfs_fsblock_t bno, /* starting block number of extent */
134 xfs_extlen_t len, /* length of extent */
135 const struct xfs_owner_info *oinfo, /* extent owner */
136 enum xfs_ag_resv_type type, /* block reservation type */
137 bool skip_discard);
138
139 static inline int
xfs_free_extent(struct xfs_trans * tp,xfs_fsblock_t bno,xfs_extlen_t len,const struct xfs_owner_info * oinfo,enum xfs_ag_resv_type type)140 xfs_free_extent(
141 struct xfs_trans *tp,
142 xfs_fsblock_t bno,
143 xfs_extlen_t len,
144 const struct xfs_owner_info *oinfo,
145 enum xfs_ag_resv_type type)
146 {
147 return __xfs_free_extent(tp, bno, len, oinfo, type, false);
148 }
149
150 int /* error */
151 xfs_alloc_lookup_le(
152 struct xfs_btree_cur *cur, /* btree cursor */
153 xfs_agblock_t bno, /* starting block of extent */
154 xfs_extlen_t len, /* length of extent */
155 int *stat); /* success/failure */
156
157 int /* error */
158 xfs_alloc_lookup_ge(
159 struct xfs_btree_cur *cur, /* btree cursor */
160 xfs_agblock_t bno, /* starting block of extent */
161 xfs_extlen_t len, /* length of extent */
162 int *stat); /* success/failure */
163
164 int /* error */
165 xfs_alloc_get_rec(
166 struct xfs_btree_cur *cur, /* btree cursor */
167 xfs_agblock_t *bno, /* output: starting block of extent */
168 xfs_extlen_t *len, /* output: length of extent */
169 int *stat); /* output: success/failure */
170
171 int xfs_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags,
172 struct xfs_buf **agfbpp);
173 int xfs_alloc_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags,
174 struct xfs_buf **agfbpp);
175 int xfs_alloc_read_agfl(struct xfs_perag *pag, struct xfs_trans *tp,
176 struct xfs_buf **bpp);
177 int xfs_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t,
178 struct xfs_buf *, struct xfs_owner_info *);
179 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags);
180 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, struct xfs_perag *pag,
181 struct xfs_buf **agbp);
182
183 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
184
185 typedef int (*xfs_alloc_query_range_fn)(
186 struct xfs_btree_cur *cur,
187 const struct xfs_alloc_rec_incore *rec,
188 void *priv);
189
190 int xfs_alloc_query_range(struct xfs_btree_cur *cur,
191 const struct xfs_alloc_rec_incore *low_rec,
192 const struct xfs_alloc_rec_incore *high_rec,
193 xfs_alloc_query_range_fn fn, void *priv);
194 int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn,
195 void *priv);
196
197 int xfs_alloc_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno,
198 xfs_extlen_t len, bool *exist);
199
200 typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno,
201 void *priv);
202 int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf,
203 struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv);
204
205 static inline __be32 *
xfs_buf_to_agfl_bno(struct xfs_buf * bp)206 xfs_buf_to_agfl_bno(
207 struct xfs_buf *bp)
208 {
209 if (xfs_has_crc(bp->b_mount))
210 return bp->b_addr + sizeof(struct xfs_agfl);
211 return bp->b_addr;
212 }
213
214 void __xfs_free_extent_later(struct xfs_trans *tp, xfs_fsblock_t bno,
215 xfs_filblks_t len, const struct xfs_owner_info *oinfo,
216 bool skip_discard);
217
218 /*
219 * List of extents to be free "later".
220 * The list is kept sorted on xbf_startblock.
221 */
222 struct xfs_extent_free_item {
223 struct list_head xefi_list;
224 uint64_t xefi_owner;
225 xfs_fsblock_t xefi_startblock;/* starting fs block number */
226 xfs_extlen_t xefi_blockcount;/* number of blocks in extent */
227 unsigned int xefi_flags;
228 };
229
230 #define XFS_EFI_SKIP_DISCARD (1U << 0) /* don't issue discard */
231 #define XFS_EFI_ATTR_FORK (1U << 1) /* freeing attr fork block */
232 #define XFS_EFI_BMBT_BLOCK (1U << 2) /* freeing bmap btree block */
233
234 static inline void
xfs_free_extent_later(struct xfs_trans * tp,xfs_fsblock_t bno,xfs_filblks_t len,const struct xfs_owner_info * oinfo)235 xfs_free_extent_later(
236 struct xfs_trans *tp,
237 xfs_fsblock_t bno,
238 xfs_filblks_t len,
239 const struct xfs_owner_info *oinfo)
240 {
241 __xfs_free_extent_later(tp, bno, len, oinfo, false);
242 }
243
244
245 extern struct kmem_cache *xfs_extfree_item_cache;
246
247 int __init xfs_extfree_intent_init_cache(void);
248 void xfs_extfree_intent_destroy_cache(void);
249
250 #endif /* __XFS_ALLOC_H__ */
251