1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6 #ifndef __XFS_RTALLOC_H__
7 #define __XFS_RTALLOC_H__
8
9 /* kernel only definitions and functions */
10
11 struct xfs_mount;
12 struct xfs_trans;
13
14 /*
15 * XXX: Most of the realtime allocation functions deal in units of realtime
16 * extents, not realtime blocks. This looks funny when paired with the type
17 * name and screams for a larger cleanup.
18 */
19 struct xfs_rtalloc_rec {
20 xfs_rtblock_t ar_startext;
21 xfs_rtblock_t ar_extcount;
22 };
23
24 typedef int (*xfs_rtalloc_query_range_fn)(
25 struct xfs_mount *mp,
26 struct xfs_trans *tp,
27 const struct xfs_rtalloc_rec *rec,
28 void *priv);
29
30 #ifdef CONFIG_XFS_RT
31 /*
32 * Function prototypes for exported functions.
33 */
34
35 /*
36 * Allocate an extent in the realtime subvolume, with the usual allocation
37 * parameters. The length units are all in realtime extents, as is the
38 * result block number.
39 */
40 int /* error */
41 xfs_rtallocate_extent(
42 struct xfs_trans *tp, /* transaction pointer */
43 xfs_rtblock_t bno, /* starting block number to allocate */
44 xfs_extlen_t minlen, /* minimum length to allocate */
45 xfs_extlen_t maxlen, /* maximum length to allocate */
46 xfs_extlen_t *len, /* out: actual length allocated */
47 int wasdel, /* was a delayed allocation extent */
48 xfs_extlen_t prod, /* extent product factor */
49 xfs_rtblock_t *rtblock); /* out: start block allocated */
50
51 /*
52 * Free an extent in the realtime subvolume. Length is expressed in
53 * realtime extents, as is the block number.
54 */
55 int /* error */
56 xfs_rtfree_extent(
57 struct xfs_trans *tp, /* transaction pointer */
58 xfs_rtblock_t bno, /* starting block number to free */
59 xfs_extlen_t len); /* length of extent freed */
60
61 /* Same as above, but in units of rt blocks. */
62 int xfs_rtfree_blocks(struct xfs_trans *tp, xfs_fsblock_t rtbno,
63 xfs_filblks_t rtlen);
64
65 /*
66 * Initialize realtime fields in the mount structure.
67 */
68 int /* error */
69 xfs_rtmount_init(
70 struct xfs_mount *mp); /* file system mount structure */
71 void
72 xfs_rtunmount_inodes(
73 struct xfs_mount *mp);
74
75 /*
76 * Get the bitmap and summary inodes into the mount structure
77 * at mount time.
78 */
79 int /* error */
80 xfs_rtmount_inodes(
81 struct xfs_mount *mp); /* file system mount structure */
82
83 /*
84 * Pick an extent for allocation at the start of a new realtime file.
85 * Use the sequence number stored in the atime field of the bitmap inode.
86 * Translate this to a fraction of the rtextents, and return the product
87 * of rtextents and the fraction.
88 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
89 */
90 int /* error */
91 xfs_rtpick_extent(
92 struct xfs_mount *mp, /* file system mount point */
93 struct xfs_trans *tp, /* transaction pointer */
94 xfs_extlen_t len, /* allocation length (rtextents) */
95 xfs_rtblock_t *pick); /* result rt extent */
96
97 /*
98 * Grow the realtime area of the filesystem.
99 */
100 int
101 xfs_growfs_rt(
102 struct xfs_mount *mp, /* file system mount structure */
103 xfs_growfs_rt_t *in); /* user supplied growfs struct */
104
105 /*
106 * From xfs_rtbitmap.c
107 */
108 int xfs_rtbuf_get(struct xfs_mount *mp, struct xfs_trans *tp,
109 xfs_rtblock_t block, int issum, struct xfs_buf **bpp);
110 int xfs_rtcheck_range(struct xfs_mount *mp, struct xfs_trans *tp,
111 xfs_rtblock_t start, xfs_extlen_t len, int val,
112 xfs_rtblock_t *new, int *stat);
113 int xfs_rtfind_back(struct xfs_mount *mp, struct xfs_trans *tp,
114 xfs_rtblock_t start, xfs_rtblock_t limit,
115 xfs_rtblock_t *rtblock);
116 int xfs_rtfind_forw(struct xfs_mount *mp, struct xfs_trans *tp,
117 xfs_rtblock_t start, xfs_rtblock_t limit,
118 xfs_rtblock_t *rtblock);
119 int xfs_rtmodify_range(struct xfs_mount *mp, struct xfs_trans *tp,
120 xfs_rtblock_t start, xfs_extlen_t len, int val);
121 int xfs_rtmodify_summary_int(struct xfs_mount *mp, struct xfs_trans *tp,
122 int log, xfs_rtblock_t bbno, int delta,
123 struct xfs_buf **rbpp, xfs_fsblock_t *rsb,
124 xfs_suminfo_t *sum);
125 int xfs_rtmodify_summary(struct xfs_mount *mp, struct xfs_trans *tp, int log,
126 xfs_rtblock_t bbno, int delta, struct xfs_buf **rbpp,
127 xfs_fsblock_t *rsb);
128 int xfs_rtfree_range(struct xfs_mount *mp, struct xfs_trans *tp,
129 xfs_rtblock_t start, xfs_extlen_t len,
130 struct xfs_buf **rbpp, xfs_fsblock_t *rsb);
131 int xfs_rtalloc_query_range(struct xfs_mount *mp, struct xfs_trans *tp,
132 const struct xfs_rtalloc_rec *low_rec,
133 const struct xfs_rtalloc_rec *high_rec,
134 xfs_rtalloc_query_range_fn fn, void *priv);
135 int xfs_rtalloc_query_all(struct xfs_mount *mp, struct xfs_trans *tp,
136 xfs_rtalloc_query_range_fn fn,
137 void *priv);
138 bool xfs_verify_rtbno(struct xfs_mount *mp, xfs_rtblock_t rtbno);
139 int xfs_rtalloc_extent_is_free(struct xfs_mount *mp, struct xfs_trans *tp,
140 xfs_rtblock_t start, xfs_extlen_t len,
141 bool *is_free);
142 int xfs_rtalloc_reinit_frextents(struct xfs_mount *mp);
143 #else
144 # define xfs_rtallocate_extent(t,b,min,max,l,f,p,rb) (-ENOSYS)
145 # define xfs_rtfree_extent(t,b,l) (-ENOSYS)
146 # define xfs_rtfree_blocks(t,rb,rl) (-ENOSYS)
147 # define xfs_rtpick_extent(m,t,l,rb) (-ENOSYS)
148 # define xfs_growfs_rt(mp,in) (-ENOSYS)
149 # define xfs_rtalloc_query_range(m,t,l,h,f,p) (-ENOSYS)
150 # define xfs_rtalloc_query_all(m,t,f,p) (-ENOSYS)
151 # define xfs_rtbuf_get(m,t,b,i,p) (-ENOSYS)
152 # define xfs_verify_rtbno(m, r) (false)
153 # define xfs_rtalloc_extent_is_free(m,t,s,l,i) (-ENOSYS)
154 # define xfs_rtalloc_reinit_frextents(m) (0)
155 static inline int /* error */
xfs_rtmount_init( xfs_mount_t *mp)156 xfs_rtmount_init(
157 xfs_mount_t *mp) /* file system mount structure */
158 {
159 if (mp->m_sb.sb_rblocks == 0)
160 return 0;
161
162 xfs_warn(mp, "Not built with CONFIG_XFS_RT");
163 return -ENOSYS;
164 }
165 # define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (-ENOSYS))
166 # define xfs_rtunmount_inodes(m)
167 #endif /* CONFIG_XFS_RT */
168
169 #endif /* __XFS_RTALLOC_H__ */
170