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
xfs_free_extent(struct xfs_trans * tp,struct xfs_perag * pag,xfs_agblock_t agbno,xfs_extlen_t len,const struct xfs_owner_info * oinfo,enum xfs_ag_resv_type type)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 	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_irec(struct xfs_btree_cur *cur,
189 		const struct xfs_alloc_rec_incore *irec);
190 
191 int xfs_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags,
192 		struct xfs_buf **agfbpp);
193 int xfs_alloc_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags,
194 		struct xfs_buf **agfbpp);
195 int xfs_alloc_read_agfl(struct xfs_perag *pag, struct xfs_trans *tp,
196 		struct xfs_buf **bpp);
197 int xfs_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t,
198 			struct xfs_buf *, struct xfs_owner_info *);
199 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, uint32_t alloc_flags);
200 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, struct xfs_perag *pag,
201 		struct xfs_buf **agbp);
202 
203 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
204 
205 typedef int (*xfs_alloc_query_range_fn)(
206 	struct xfs_btree_cur			*cur,
207 	const struct xfs_alloc_rec_incore	*rec,
208 	void					*priv);
209 
210 int xfs_alloc_query_range(struct xfs_btree_cur *cur,
211 		const struct xfs_alloc_rec_incore *low_rec,
212 		const struct xfs_alloc_rec_incore *high_rec,
213 		xfs_alloc_query_range_fn fn, void *priv);
214 int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn,
215 		void *priv);
216 
217 int xfs_alloc_has_records(struct xfs_btree_cur *cur, xfs_agblock_t bno,
218 		xfs_extlen_t len, enum xbtree_recpacking *outcome);
219 
220 typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno,
221 		void *priv);
222 int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf,
223 		struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv);
224 
225 static inline __be32 *
xfs_buf_to_agfl_bno(struct xfs_buf * bp)226 xfs_buf_to_agfl_bno(
227 	struct xfs_buf		*bp)
228 {
229 	if (xfs_has_crc(bp->b_mount))
230 		return bp->b_addr + sizeof(struct xfs_agfl);
231 	return bp->b_addr;
232 }
233 
234 int __xfs_free_extent_later(struct xfs_trans *tp, xfs_fsblock_t bno,
235 		xfs_filblks_t len, const struct xfs_owner_info *oinfo,
236 		enum xfs_ag_resv_type type, bool skip_discard);
237 
238 /*
239  * List of extents to be free "later".
240  * The list is kept sorted on xbf_startblock.
241  */
242 struct xfs_extent_free_item {
243 	struct list_head	xefi_list;
244 	uint64_t		xefi_owner;
245 	xfs_fsblock_t		xefi_startblock;/* starting fs block number */
246 	xfs_extlen_t		xefi_blockcount;/* number of blocks in extent */
247 	struct xfs_perag	*xefi_pag;
248 	unsigned int		xefi_flags;
249 	enum xfs_ag_resv_type	xefi_agresv;
250 };
251 
252 void xfs_extent_free_get_group(struct xfs_mount *mp,
253 		struct xfs_extent_free_item *xefi);
254 
255 #define XFS_EFI_SKIP_DISCARD	(1U << 0) /* don't issue discard */
256 #define XFS_EFI_ATTR_FORK	(1U << 1) /* freeing attr fork block */
257 #define XFS_EFI_BMBT_BLOCK	(1U << 2) /* freeing bmap btree block */
258 
259 static inline int
xfs_free_extent_later(struct xfs_trans * tp,xfs_fsblock_t bno,xfs_filblks_t len,const struct xfs_owner_info * oinfo,enum xfs_ag_resv_type type)260 xfs_free_extent_later(
261 	struct xfs_trans		*tp,
262 	xfs_fsblock_t			bno,
263 	xfs_filblks_t			len,
264 	const struct xfs_owner_info	*oinfo,
265 	enum xfs_ag_resv_type		type)
266 {
267 	return __xfs_free_extent_later(tp, bno, len, oinfo, type, false);
268 }
269 
270 
271 extern struct kmem_cache	*xfs_extfree_item_cache;
272 
273 int __init xfs_extfree_intent_init_cache(void);
274 void xfs_extfree_intent_destroy_cache(void);
275 
276 xfs_failaddr_t xfs_validate_ag_length(struct xfs_buf *bp, uint32_t seqno,
277 		uint32_t length);
278 
279 #endif	/* __XFS_ALLOC_H__ */
280