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192.168.1.100 / T800 / a9a9c63d6216da5fe76a648b0f990f7c74e4e59c / . / src / kernel / linux / v4.19 / fs / xfs / xfs_rtalloc.h
blob: 93e77b2213559d8ad932d47a18afa1522e7d97ba [file] [log] [blame]
xjb04a4022021-11-25 15:01:52 +0800[diff] [blame]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
11struct xfs_mount;
12struct 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 */
19struct xfs_rtalloc_rec {
20 xfs_rtblock_t ar_startext;
21 xfs_rtblock_t ar_extcount;
22};
23
24typedef int (*xfs_rtalloc_query_range_fn)(
25 struct xfs_trans *tp,
26 struct xfs_rtalloc_rec *rec,
27 void *priv);
28
29#ifdef CONFIG_XFS_RT
30/*
31 * Function prototypes for exported functions.
32 */
33
34/*
35 * Allocate an extent in the realtime subvolume, with the usual allocation
36 * parameters. The length units are all in realtime extents, as is the
37 * result block number.
38 */
39int /* error */
40xfs_rtallocate_extent(
41 struct xfs_trans *tp, /* transaction pointer */
42 xfs_rtblock_t bno, /* starting block number to allocate */
43 xfs_extlen_t minlen, /* minimum length to allocate */
44 xfs_extlen_t maxlen, /* maximum length to allocate */
45 xfs_extlen_t *len, /* out: actual length allocated */
46 int wasdel, /* was a delayed allocation extent */
47 xfs_extlen_t prod, /* extent product factor */
48 xfs_rtblock_t *rtblock); /* out: start block allocated */
49
50/*
51 * Free an extent in the realtime subvolume. Length is expressed in
52 * realtime extents, as is the block number.
53 */
54int /* error */
55xfs_rtfree_extent(
56 struct xfs_trans *tp, /* transaction pointer */
57 xfs_rtblock_t bno, /* starting block number to free */
58 xfs_extlen_t len); /* length of extent freed */
59
60/*
61 * Initialize realtime fields in the mount structure.
62 */
63int /* error */
64xfs_rtmount_init(
65 struct xfs_mount *mp); /* file system mount structure */
66void
67xfs_rtunmount_inodes(
68 struct xfs_mount *mp);
69
70/*
71 * Get the bitmap and summary inodes into the mount structure
72 * at mount time.
73 */
74int /* error */
75xfs_rtmount_inodes(
76 struct xfs_mount *mp); /* file system mount structure */
77
78/*
79 * Pick an extent for allocation at the start of a new realtime file.
80 * Use the sequence number stored in the atime field of the bitmap inode.
81 * Translate this to a fraction of the rtextents, and return the product
82 * of rtextents and the fraction.
83 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
84 */
85int /* error */
86xfs_rtpick_extent(
87 struct xfs_mount *mp, /* file system mount point */
88 struct xfs_trans *tp, /* transaction pointer */
89 xfs_extlen_t len, /* allocation length (rtextents) */
90 xfs_rtblock_t *pick); /* result rt extent */
91
92/*
93 * Grow the realtime area of the filesystem.
94 */
95int
96xfs_growfs_rt(
97 struct xfs_mount *mp, /* file system mount structure */
98 xfs_growfs_rt_t *in); /* user supplied growfs struct */
99
100/*
101 * From xfs_rtbitmap.c
102 */
103int xfs_rtbuf_get(struct xfs_mount *mp, struct xfs_trans *tp,
104 xfs_rtblock_t block, int issum, struct xfs_buf **bpp);
105int xfs_rtcheck_range(struct xfs_mount *mp, struct xfs_trans *tp,
106 xfs_rtblock_t start, xfs_extlen_t len, int val,
107 xfs_rtblock_t *new, int *stat);
108int xfs_rtfind_back(struct xfs_mount *mp, struct xfs_trans *tp,
109 xfs_rtblock_t start, xfs_rtblock_t limit,
110 xfs_rtblock_t *rtblock);
111int xfs_rtfind_forw(struct xfs_mount *mp, struct xfs_trans *tp,
112 xfs_rtblock_t start, xfs_rtblock_t limit,
113 xfs_rtblock_t *rtblock);
114int xfs_rtmodify_range(struct xfs_mount *mp, struct xfs_trans *tp,
115 xfs_rtblock_t start, xfs_extlen_t len, int val);
116int xfs_rtmodify_summary_int(struct xfs_mount *mp, struct xfs_trans *tp,
117 int log, xfs_rtblock_t bbno, int delta,
118 xfs_buf_t **rbpp, xfs_fsblock_t *rsb,
119 xfs_suminfo_t *sum);
120int xfs_rtmodify_summary(struct xfs_mount *mp, struct xfs_trans *tp, int log,
121 xfs_rtblock_t bbno, int delta, xfs_buf_t **rbpp,
122 xfs_fsblock_t *rsb);
123int xfs_rtfree_range(struct xfs_mount *mp, struct xfs_trans *tp,
124 xfs_rtblock_t start, xfs_extlen_t len,
125 struct xfs_buf **rbpp, xfs_fsblock_t *rsb);
126int xfs_rtalloc_query_range(struct xfs_trans *tp,
127 struct xfs_rtalloc_rec *low_rec,
128 struct xfs_rtalloc_rec *high_rec,
129 xfs_rtalloc_query_range_fn fn,
130 void *priv);
131int xfs_rtalloc_query_all(struct xfs_trans *tp,
132 xfs_rtalloc_query_range_fn fn,
133 void *priv);
134bool xfs_verify_rtbno(struct xfs_mount *mp, xfs_rtblock_t rtbno);
135int xfs_rtalloc_extent_is_free(struct xfs_mount *mp, struct xfs_trans *tp,
136 xfs_rtblock_t start, xfs_extlen_t len,
137 bool *is_free);
138#else
139# define xfs_rtallocate_extent(t,b,min,max,l,f,p,rb) (ENOSYS)
140# define xfs_rtfree_extent(t,b,l) (ENOSYS)
141# define xfs_rtpick_extent(m,t,l,rb) (ENOSYS)
142# define xfs_growfs_rt(mp,in) (ENOSYS)
143# define xfs_rtalloc_query_range(t,l,h,f,p) (ENOSYS)
144# define xfs_rtalloc_query_all(t,f,p) (ENOSYS)
145# define xfs_rtbuf_get(m,t,b,i,p) (ENOSYS)
146# define xfs_verify_rtbno(m, r) (false)
147# define xfs_rtalloc_extent_is_free(m,t,s,l,i) (ENOSYS)
148static inline int /* error */
149xfs_rtmount_init(
150 xfs_mount_t *mp) /* file system mount structure */
151{
152 if (mp->m_sb.sb_rblocks == 0)
153 return 0;
154
155 xfs_warn(mp, "Not built with CONFIG_XFS_RT");
156 return -ENOSYS;
157}
158# define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
159# define xfs_rtunmount_inodes(m)
160#endif /* CONFIG_XFS_RT */
161
162#endif /* __XFS_RTALLOC_H__ */