2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 #ifndef __XFS_RTALLOC_H__
19 #define __XFS_RTALLOC_H__
21 /* kernel only definitions and functions */
26 struct xfs_rtalloc_rec {
27 xfs_rtblock_t ar_startblock;
28 xfs_rtblock_t ar_blockcount;
31 typedef int (*xfs_rtalloc_query_range_fn)(
33 struct xfs_rtalloc_rec *rec,
38 * Function prototypes for exported functions.
42 * Allocate an extent in the realtime subvolume, with the usual allocation
43 * parameters. The length units are all in realtime extents, as is the
44 * result block number.
47 xfs_rtallocate_extent(
48 struct xfs_trans *tp, /* transaction pointer */
49 xfs_rtblock_t bno, /* starting block number to allocate */
50 xfs_extlen_t minlen, /* minimum length to allocate */
51 xfs_extlen_t maxlen, /* maximum length to allocate */
52 xfs_extlen_t *len, /* out: actual length allocated */
53 int wasdel, /* was a delayed allocation extent */
54 xfs_extlen_t prod, /* extent product factor */
55 xfs_rtblock_t *rtblock); /* out: start block allocated */
58 * Free an extent in the realtime subvolume. Length is expressed in
59 * realtime extents, as is the block number.
63 struct xfs_trans *tp, /* transaction pointer */
64 xfs_rtblock_t bno, /* starting block number to free */
65 xfs_extlen_t len); /* length of extent freed */
68 * Initialize realtime fields in the mount structure.
72 struct xfs_mount *mp); /* file system mount structure */
75 struct xfs_mount *mp);
78 * Get the bitmap and summary inodes into the mount structure
83 struct xfs_mount *mp); /* file system mount structure */
86 * Pick an extent for allocation at the start of a new realtime file.
87 * Use the sequence number stored in the atime field of the bitmap inode.
88 * Translate this to a fraction of the rtextents, and return the product
89 * of rtextents and the fraction.
90 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
94 struct xfs_mount *mp, /* file system mount point */
95 struct xfs_trans *tp, /* transaction pointer */
96 xfs_extlen_t len, /* allocation length (rtextents) */
97 xfs_rtblock_t *pick); /* result rt extent */
100 * Grow the realtime area of the filesystem.
104 struct xfs_mount *mp, /* file system mount structure */
105 xfs_growfs_rt_t *in); /* user supplied growfs struct */
108 * From xfs_rtbitmap.c
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 xfs_buf_t **rbpp, xfs_fsblock_t *rsb,
125 int xfs_rtmodify_summary(struct xfs_mount *mp, struct xfs_trans *tp, int log,
126 xfs_rtblock_t bbno, int delta, xfs_buf_t **rbpp,
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_trans *tp,
132 struct xfs_rtalloc_rec *low_rec,
133 struct xfs_rtalloc_rec *high_rec,
134 xfs_rtalloc_query_range_fn fn,
136 int xfs_rtalloc_query_all(struct xfs_trans *tp,
137 xfs_rtalloc_query_range_fn fn,
140 # define xfs_rtallocate_extent(t,b,min,max,l,f,p,rb) (ENOSYS)
141 # define xfs_rtfree_extent(t,b,l) (ENOSYS)
142 # define xfs_rtpick_extent(m,t,l,rb) (ENOSYS)
143 # define xfs_growfs_rt(mp,in) (ENOSYS)
144 # define xfs_rtalloc_query_range(t,l,h,f,p) (ENOSYS)
145 # define xfs_rtalloc_query_all(t,f,p) (ENOSYS)
146 static inline int /* error */
148 xfs_mount_t *mp) /* file system mount structure */
150 if (mp->m_sb.sb_rblocks == 0)
153 xfs_warn(mp, "Not built with CONFIG_XFS_RT");
156 # define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
157 # define xfs_rtunmount_inodes(m)
158 #endif /* CONFIG_XFS_RT */
160 #endif /* __XFS_RTALLOC_H__ */