xref: /openbmc/linux/fs/xfs/libxfs/xfs_alloc.h (revision da2ef666)
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 	struct xfs_inode *ip;		/* for userdata zeroing method */
58 	xfs_fsblock_t	fsbno;		/* file system block number */
59 	xfs_agnumber_t	agno;		/* allocation group number */
60 	xfs_agblock_t	agbno;		/* allocation group-relative block # */
61 	xfs_extlen_t	minlen;		/* minimum size of extent */
62 	xfs_extlen_t	maxlen;		/* maximum size of extent */
63 	xfs_extlen_t	mod;		/* mod value for extent size */
64 	xfs_extlen_t	prod;		/* prod value for extent size */
65 	xfs_extlen_t	minleft;	/* min blocks must be left after us */
66 	xfs_extlen_t	total;		/* total blocks needed in xaction */
67 	xfs_extlen_t	alignment;	/* align answer to multiple of this */
68 	xfs_extlen_t	minalignslop;	/* slop for minlen+alignment calcs */
69 	xfs_agblock_t	min_agbno;	/* set an agbno range for NEAR allocs */
70 	xfs_agblock_t	max_agbno;	/* ... */
71 	xfs_extlen_t	len;		/* output: actual size of extent */
72 	xfs_alloctype_t	type;		/* allocation type XFS_ALLOCTYPE_... */
73 	xfs_alloctype_t	otype;		/* original allocation type */
74 	int		datatype;	/* mask defining data type treatment */
75 	char		wasdel;		/* set if allocation was prev delayed */
76 	char		wasfromfl;	/* set if allocation is from freelist */
77 	struct xfs_owner_info	oinfo;	/* owner of blocks being allocated */
78 	enum xfs_ag_resv_type	resv;	/* block reservation to use */
79 } xfs_alloc_arg_t;
80 
81 /*
82  * Defines for datatype
83  */
84 #define XFS_ALLOC_USERDATA		(1 << 0)/* allocation is for user data*/
85 #define XFS_ALLOC_INITIAL_USER_DATA	(1 << 1)/* special case start of file */
86 #define XFS_ALLOC_USERDATA_ZERO		(1 << 2)/* zero extent on allocation */
87 #define XFS_ALLOC_NOBUSY		(1 << 3)/* Busy extents not allowed */
88 
89 static inline bool
90 xfs_alloc_is_userdata(int datatype)
91 {
92 	return (datatype & ~XFS_ALLOC_NOBUSY) != 0;
93 }
94 
95 static inline bool
96 xfs_alloc_allow_busy_reuse(int datatype)
97 {
98 	return (datatype & XFS_ALLOC_NOBUSY) == 0;
99 }
100 
101 /* freespace limit calculations */
102 #define XFS_ALLOC_AGFL_RESERVE	4
103 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp);
104 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp);
105 
106 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag,
107 		xfs_extlen_t need, xfs_extlen_t reserved);
108 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp,
109 		struct xfs_perag *pag);
110 
111 /*
112  * Compute and fill in value of m_ag_maxlevels.
113  */
114 void
115 xfs_alloc_compute_maxlevels(
116 	struct xfs_mount	*mp);	/* file system mount structure */
117 
118 /*
119  * Get a block from the freelist.
120  * Returns with the buffer for the block gotten.
121  */
122 int				/* error */
123 xfs_alloc_get_freelist(
124 	struct xfs_trans *tp,	/* transaction pointer */
125 	struct xfs_buf	*agbp,	/* buffer containing the agf structure */
126 	xfs_agblock_t	*bnop,	/* block address retrieved from freelist */
127 	int		btreeblk); /* destination is a AGF btree */
128 
129 /*
130  * Log the given fields from the agf structure.
131  */
132 void
133 xfs_alloc_log_agf(
134 	struct xfs_trans *tp,	/* transaction pointer */
135 	struct xfs_buf	*bp,	/* buffer for a.g. freelist header */
136 	int		fields);/* mask of fields to be logged (XFS_AGF_...) */
137 
138 /*
139  * Interface for inode allocation to force the pag data to be initialized.
140  */
141 int				/* error */
142 xfs_alloc_pagf_init(
143 	struct xfs_mount *mp,	/* file system mount structure */
144 	struct xfs_trans *tp,	/* transaction pointer */
145 	xfs_agnumber_t	agno,	/* allocation group number */
146 	int		flags);	/* XFS_ALLOC_FLAGS_... */
147 
148 /*
149  * Put the block on the freelist for the allocation group.
150  */
151 int				/* error */
152 xfs_alloc_put_freelist(
153 	struct xfs_trans *tp,	/* transaction pointer */
154 	struct xfs_buf	*agbp,	/* buffer for a.g. freelist header */
155 	struct xfs_buf	*agflbp,/* buffer for a.g. free block array */
156 	xfs_agblock_t	bno,	/* block being freed */
157 	int		btreeblk); /* owner was a AGF btree */
158 
159 /*
160  * Read in the allocation group header (free/alloc section).
161  */
162 int					/* error  */
163 xfs_alloc_read_agf(
164 	struct xfs_mount *mp,		/* mount point structure */
165 	struct xfs_trans *tp,		/* transaction pointer */
166 	xfs_agnumber_t	agno,		/* allocation group number */
167 	int		flags,		/* XFS_ALLOC_FLAG_... */
168 	struct xfs_buf	**bpp);		/* buffer for the ag freelist header */
169 
170 /*
171  * Allocate an extent (variable-size).
172  */
173 int				/* error */
174 xfs_alloc_vextent(
175 	xfs_alloc_arg_t	*args);	/* allocation argument structure */
176 
177 /*
178  * Free an extent.
179  */
180 int				/* error */
181 __xfs_free_extent(
182 	struct xfs_trans	*tp,	/* transaction pointer */
183 	xfs_fsblock_t		bno,	/* starting block number of extent */
184 	xfs_extlen_t		len,	/* length of extent */
185 	struct xfs_owner_info	*oinfo,	/* extent owner */
186 	enum xfs_ag_resv_type	type,	/* block reservation type */
187 	bool			skip_discard);
188 
189 static inline int
190 xfs_free_extent(
191 	struct xfs_trans	*tp,
192 	xfs_fsblock_t		bno,
193 	xfs_extlen_t		len,
194 	struct xfs_owner_info	*oinfo,
195 	enum xfs_ag_resv_type	type)
196 {
197 	return __xfs_free_extent(tp, bno, len, oinfo, type, false);
198 }
199 
200 int				/* error */
201 xfs_alloc_lookup_le(
202 	struct xfs_btree_cur	*cur,	/* btree cursor */
203 	xfs_agblock_t		bno,	/* starting block of extent */
204 	xfs_extlen_t		len,	/* length of extent */
205 	int			*stat);	/* success/failure */
206 
207 int				/* error */
208 xfs_alloc_lookup_ge(
209 	struct xfs_btree_cur	*cur,	/* btree cursor */
210 	xfs_agblock_t		bno,	/* starting block of extent */
211 	xfs_extlen_t		len,	/* length of extent */
212 	int			*stat);	/* success/failure */
213 
214 int					/* error */
215 xfs_alloc_get_rec(
216 	struct xfs_btree_cur	*cur,	/* btree cursor */
217 	xfs_agblock_t		*bno,	/* output: starting block of extent */
218 	xfs_extlen_t		*len,	/* output: length of extent */
219 	int			*stat);	/* output: success/failure */
220 
221 int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,
222 			xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);
223 int xfs_alloc_read_agfl(struct xfs_mount *mp, struct xfs_trans *tp,
224 			xfs_agnumber_t agno, struct xfs_buf **bpp);
225 int xfs_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t,
226 			struct xfs_buf *, struct xfs_owner_info *);
227 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags);
228 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno,
229 		struct xfs_buf **agbp);
230 
231 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
232 
233 typedef int (*xfs_alloc_query_range_fn)(
234 	struct xfs_btree_cur		*cur,
235 	struct xfs_alloc_rec_incore	*rec,
236 	void				*priv);
237 
238 int xfs_alloc_query_range(struct xfs_btree_cur *cur,
239 		struct xfs_alloc_rec_incore *low_rec,
240 		struct xfs_alloc_rec_incore *high_rec,
241 		xfs_alloc_query_range_fn fn, void *priv);
242 int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn,
243 		void *priv);
244 
245 int xfs_alloc_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno,
246 		xfs_extlen_t len, bool *exist);
247 
248 typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno,
249 		void *priv);
250 int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf,
251 		struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv);
252 
253 #endif	/* __XFS_ALLOC_H__ */
254