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 * Freespace allocation types. Argument to xfs_alloc_[v]extent.
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 */
28 /* this should become an enum again when the tracing code is fixed */
29 typedef unsigned int xfs_alloctype_t;
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" }
39 * Flags for xfs_alloc_fix_freelist.
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 */
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.
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 */
79 bool alloc_minlen_only; /* allocate exact minlen extent */
84 * Defines for datatype
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 */
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);
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);
100 * Compute and fill in value of m_alloc_maxlevels.
103 xfs_alloc_compute_maxlevels(
104 struct xfs_mount *mp); /* file system mount structure */
107 * Get a block from the freelist.
108 * Returns with the buffer for the block gotten.
111 xfs_alloc_get_freelist(
112 struct xfs_trans *tp, /* transaction pointer */
113 struct xfs_buf *agbp, /* buffer containing the agf structure */
114 xfs_agblock_t *bnop, /* block address retrieved from freelist */
115 int btreeblk); /* destination is a AGF btree */
118 * Log the given fields from the agf structure.
122 struct xfs_trans *tp, /* transaction pointer */
123 struct xfs_buf *bp, /* buffer for a.g. freelist header */
124 uint32_t fields);/* mask of fields to be logged (XFS_AGF_...) */
127 * Interface for inode allocation to force the pag data to be initialized.
131 struct xfs_mount *mp, /* file system mount structure */
132 struct xfs_trans *tp, /* transaction pointer */
133 xfs_agnumber_t agno, /* allocation group number */
134 int flags); /* XFS_ALLOC_FLAGS_... */
137 * Put the block on the freelist for the allocation group.
140 xfs_alloc_put_freelist(
141 struct xfs_trans *tp, /* transaction pointer */
142 struct xfs_buf *agbp, /* buffer for a.g. freelist header */
143 struct xfs_buf *agflbp,/* buffer for a.g. free block array */
144 xfs_agblock_t bno, /* block being freed */
145 int btreeblk); /* owner was a AGF btree */
148 * Read in the allocation group header (free/alloc section).
152 struct xfs_mount *mp, /* mount point structure */
153 struct xfs_trans *tp, /* transaction pointer */
154 xfs_agnumber_t agno, /* allocation group number */
155 int flags, /* XFS_ALLOC_FLAG_... */
156 struct xfs_buf **bpp); /* buffer for the ag freelist header */
159 * Allocate an extent (variable-size).
163 xfs_alloc_arg_t *args); /* allocation argument structure */
170 struct xfs_trans *tp, /* transaction pointer */
171 xfs_fsblock_t bno, /* starting block number of extent */
172 xfs_extlen_t len, /* length of extent */
173 const struct xfs_owner_info *oinfo, /* extent owner */
174 enum xfs_ag_resv_type type, /* block reservation type */
179 struct xfs_trans *tp,
182 const struct xfs_owner_info *oinfo,
183 enum xfs_ag_resv_type type)
185 return __xfs_free_extent(tp, bno, len, oinfo, type, false);
190 struct xfs_btree_cur *cur, /* btree cursor */
191 xfs_agblock_t bno, /* starting block of extent */
192 xfs_extlen_t len, /* length of extent */
193 int *stat); /* success/failure */
197 struct xfs_btree_cur *cur, /* btree cursor */
198 xfs_agblock_t bno, /* starting block of extent */
199 xfs_extlen_t len, /* length of extent */
200 int *stat); /* success/failure */
204 struct xfs_btree_cur *cur, /* btree cursor */
205 xfs_agblock_t *bno, /* output: starting block of extent */
206 xfs_extlen_t *len, /* output: length of extent */
207 int *stat); /* output: success/failure */
209 int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,
210 xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);
211 int xfs_alloc_read_agfl(struct xfs_mount *mp, struct xfs_trans *tp,
212 xfs_agnumber_t agno, struct xfs_buf **bpp);
213 int xfs_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t,
214 struct xfs_buf *, struct xfs_owner_info *);
215 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags);
216 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, struct xfs_perag *pag,
217 struct xfs_buf **agbp);
219 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
221 typedef int (*xfs_alloc_query_range_fn)(
222 struct xfs_btree_cur *cur,
223 const struct xfs_alloc_rec_incore *rec,
226 int xfs_alloc_query_range(struct xfs_btree_cur *cur,
227 const struct xfs_alloc_rec_incore *low_rec,
228 const struct xfs_alloc_rec_incore *high_rec,
229 xfs_alloc_query_range_fn fn, void *priv);
230 int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn,
233 int xfs_alloc_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno,
234 xfs_extlen_t len, bool *exist);
236 typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno,
238 int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf,
239 struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv);
241 static inline __be32 *
245 if (xfs_has_crc(bp->b_mount))
246 return bp->b_addr + sizeof(struct xfs_agfl);
250 void __xfs_free_extent_later(struct xfs_trans *tp, xfs_fsblock_t bno,
251 xfs_filblks_t len, const struct xfs_owner_info *oinfo,
255 * List of extents to be free "later".
256 * The list is kept sorted on xbf_startblock.
258 struct xfs_extent_free_item {
259 struct list_head xefi_list;
261 xfs_fsblock_t xefi_startblock;/* starting fs block number */
262 xfs_extlen_t xefi_blockcount;/* number of blocks in extent */
263 unsigned int xefi_flags;
266 #define XFS_EFI_SKIP_DISCARD (1U << 0) /* don't issue discard */
267 #define XFS_EFI_ATTR_FORK (1U << 1) /* freeing attr fork block */
268 #define XFS_EFI_BMBT_BLOCK (1U << 2) /* freeing bmap btree block */
271 xfs_free_extent_later(
272 struct xfs_trans *tp,
275 const struct xfs_owner_info *oinfo)
277 __xfs_free_extent_later(tp, bno, len, oinfo, false);
281 extern struct kmem_cache *xfs_extfree_item_cache;
283 int __init xfs_extfree_intent_init_cache(void);
284 void xfs_extfree_intent_destroy_cache(void);
286 #endif /* __XFS_ALLOC_H__ */