1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
6 #ifndef __XFS_ALLOC_H__
7 #define __XFS_ALLOC_H__
15 extern struct workqueue_struct *xfs_alloc_wq;
17 unsigned int xfs_agfl_size(struct xfs_mount *mp);
20 * Flags for xfs_alloc_fix_freelist.
22 #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */
23 #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/
24 #define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */
25 #define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */
26 #define XFS_ALLOC_FLAG_CHECK 0x00000010 /* test only, don't modify args */
29 * Argument structure for xfs_alloc routines.
30 * This is turned into a structure to avoid having 20 arguments passed
31 * down several levels of the stack.
33 typedef struct xfs_alloc_arg {
34 struct xfs_trans *tp; /* transaction pointer */
35 struct xfs_mount *mp; /* file system mount point */
36 struct xfs_buf *agbp; /* buffer for a.g. freelist header */
37 struct xfs_perag *pag; /* per-ag struct for this agno */
38 xfs_fsblock_t fsbno; /* file system block number */
39 xfs_agnumber_t agno; /* allocation group number */
40 xfs_agblock_t agbno; /* allocation group-relative block # */
41 xfs_extlen_t minlen; /* minimum size of extent */
42 xfs_extlen_t maxlen; /* maximum size of extent */
43 xfs_extlen_t mod; /* mod value for extent size */
44 xfs_extlen_t prod; /* prod value for extent size */
45 xfs_extlen_t minleft; /* min blocks must be left after us */
46 xfs_extlen_t total; /* total blocks needed in xaction */
47 xfs_extlen_t alignment; /* align answer to multiple of this */
48 xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */
49 xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */
50 xfs_agblock_t max_agbno; /* ... */
51 xfs_extlen_t len; /* output: actual size of extent */
52 int datatype; /* mask defining data type treatment */
53 char wasdel; /* set if allocation was prev delayed */
54 char wasfromfl; /* set if allocation is from freelist */
55 struct xfs_owner_info oinfo; /* owner of blocks being allocated */
56 enum xfs_ag_resv_type resv; /* block reservation to use */
58 bool alloc_minlen_only; /* allocate exact minlen extent */
63 * Defines for datatype
65 #define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/
66 #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */
67 #define XFS_ALLOC_NOBUSY (1 << 2)/* Busy extents not allowed */
69 /* freespace limit calculations */
70 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp);
71 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp);
73 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag,
74 xfs_extlen_t need, xfs_extlen_t reserved);
75 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp,
76 struct xfs_perag *pag);
77 int xfs_alloc_get_freelist(struct xfs_perag *pag, struct xfs_trans *tp,
78 struct xfs_buf *agfbp, xfs_agblock_t *bnop, int btreeblk);
79 int xfs_alloc_put_freelist(struct xfs_perag *pag, struct xfs_trans *tp,
80 struct xfs_buf *agfbp, struct xfs_buf *agflbp,
81 xfs_agblock_t bno, int btreeblk);
84 * Compute and fill in value of m_alloc_maxlevels.
87 xfs_alloc_compute_maxlevels(
88 struct xfs_mount *mp); /* file system mount structure */
91 * Log the given fields from the agf structure.
95 struct xfs_trans *tp, /* transaction pointer */
96 struct xfs_buf *bp, /* buffer for a.g. freelist header */
97 uint32_t fields);/* mask of fields to be logged (XFS_AGF_...) */
100 * Allocate an extent anywhere in the specific AG given. If there is no
101 * space matching the requirements in that AG, then the allocation will fail.
103 int xfs_alloc_vextent_this_ag(struct xfs_alloc_arg *args, xfs_agnumber_t agno);
106 * Allocate an extent as close to the target as possible. If there are not
107 * viable candidates in the AG, then fail the allocation.
109 int xfs_alloc_vextent_near_bno(struct xfs_alloc_arg *args,
110 xfs_fsblock_t target);
113 * Allocate an extent exactly at the target given. If this is not possible
114 * then the allocation fails.
116 int xfs_alloc_vextent_exact_bno(struct xfs_alloc_arg *args,
117 xfs_fsblock_t target);
120 * Best effort full filesystem allocation scan.
122 * Locality aware allocation will be attempted in the initial AG, but on failure
123 * non-localised attempts will be made. The AGs are constrained by previous
124 * allocations in the current transaction. Two passes will be made - the first
125 * non-blocking, the second blocking.
127 int xfs_alloc_vextent_start_ag(struct xfs_alloc_arg *args,
128 xfs_fsblock_t target);
131 * Iterate from the AG indicated from args->fsbno through to the end of the
132 * filesystem attempting blocking allocation. This is for use in last
133 * resort allocation attempts when everything else has failed.
135 int xfs_alloc_vextent_first_ag(struct xfs_alloc_arg *args,
136 xfs_fsblock_t target);
143 struct xfs_trans *tp, /* transaction pointer */
144 struct xfs_perag *pag,
146 xfs_extlen_t len, /* length of extent */
147 const struct xfs_owner_info *oinfo, /* extent owner */
148 enum xfs_ag_resv_type type, /* block reservation type */
153 struct xfs_trans *tp,
154 struct xfs_perag *pag,
157 const struct xfs_owner_info *oinfo,
158 enum xfs_ag_resv_type type)
160 return __xfs_free_extent(tp, pag, agbno, len, oinfo, type, false);
165 struct xfs_btree_cur *cur, /* btree cursor */
166 xfs_agblock_t bno, /* starting block of extent */
167 xfs_extlen_t len, /* length of extent */
168 int *stat); /* success/failure */
172 struct xfs_btree_cur *cur, /* btree cursor */
173 xfs_agblock_t bno, /* starting block of extent */
174 xfs_extlen_t len, /* length of extent */
175 int *stat); /* success/failure */
179 struct xfs_btree_cur *cur, /* btree cursor */
180 xfs_agblock_t *bno, /* output: starting block of extent */
181 xfs_extlen_t *len, /* output: length of extent */
182 int *stat); /* output: success/failure */
185 void xfs_alloc_btrec_to_irec(const union xfs_btree_rec *rec,
186 struct xfs_alloc_rec_incore *irec);
187 xfs_failaddr_t xfs_alloc_check_irec(struct xfs_btree_cur *cur,
188 const struct xfs_alloc_rec_incore *irec);
190 int xfs_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags,
191 struct xfs_buf **agfbpp);
192 int xfs_alloc_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags,
193 struct xfs_buf **agfbpp);
194 int xfs_alloc_read_agfl(struct xfs_perag *pag, struct xfs_trans *tp,
195 struct xfs_buf **bpp);
196 int xfs_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t,
197 struct xfs_buf *, struct xfs_owner_info *);
198 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags);
199 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, struct xfs_perag *pag,
200 struct xfs_buf **agbp);
202 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
204 typedef int (*xfs_alloc_query_range_fn)(
205 struct xfs_btree_cur *cur,
206 const struct xfs_alloc_rec_incore *rec,
209 int 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);
213 int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn,
216 int xfs_alloc_has_records(struct xfs_btree_cur *cur, xfs_agblock_t bno,
217 xfs_extlen_t len, enum xbtree_recpacking *outcome);
219 typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno,
221 int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf,
222 struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv);
224 static inline __be32 *
228 if (xfs_has_crc(bp->b_mount))
229 return bp->b_addr + sizeof(struct xfs_agfl);
233 int __xfs_free_extent_later(struct xfs_trans *tp, xfs_fsblock_t bno,
234 xfs_filblks_t len, const struct xfs_owner_info *oinfo,
238 * List of extents to be free "later".
239 * The list is kept sorted on xbf_startblock.
241 struct xfs_extent_free_item {
242 struct list_head xefi_list;
244 xfs_fsblock_t xefi_startblock;/* starting fs block number */
245 xfs_extlen_t xefi_blockcount;/* number of blocks in extent */
246 struct xfs_perag *xefi_pag;
247 unsigned int xefi_flags;
250 void xfs_extent_free_get_group(struct xfs_mount *mp,
251 struct xfs_extent_free_item *xefi);
253 #define XFS_EFI_SKIP_DISCARD (1U << 0) /* don't issue discard */
254 #define XFS_EFI_ATTR_FORK (1U << 1) /* freeing attr fork block */
255 #define XFS_EFI_BMBT_BLOCK (1U << 2) /* freeing bmap btree block */
258 xfs_free_extent_later(
259 struct xfs_trans *tp,
262 const struct xfs_owner_info *oinfo)
264 return __xfs_free_extent_later(tp, bno, len, oinfo, false);
268 extern struct kmem_cache *xfs_extfree_item_cache;
270 int __init xfs_extfree_intent_init_cache(void);
271 void xfs_extfree_intent_destroy_cache(void);
273 #endif /* __XFS_ALLOC_H__ */