1/*
2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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.
8 *
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.
13 *
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
17 */
18#ifndef __XFS_RTALLOC_H__
19#define	__XFS_RTALLOC_H__
20
21/* kernel only definitions and functions */
22
23struct xfs_mount;
24struct xfs_trans;
25
26#ifdef CONFIG_XFS_RT
27/*
28 * Function prototypes for exported functions.
29 */
30
31/*
32 * Allocate an extent in the realtime subvolume, with the usual allocation
33 * parameters.  The length units are all in realtime extents, as is the
34 * result block number.
35 */
36int					/* error */
37xfs_rtallocate_extent(
38	struct xfs_trans	*tp,	/* transaction pointer */
39	xfs_rtblock_t		bno,	/* starting block number to allocate */
40	xfs_extlen_t		minlen,	/* minimum length to allocate */
41	xfs_extlen_t		maxlen,	/* maximum length to allocate */
42	xfs_extlen_t		*len,	/* out: actual length allocated */
43	xfs_alloctype_t		type,	/* allocation type XFS_ALLOCTYPE... */
44	int			wasdel,	/* was a delayed allocation extent */
45	xfs_extlen_t		prod,	/* extent product factor */
46	xfs_rtblock_t		*rtblock); /* out: start block allocated */
47
48/*
49 * Free an extent in the realtime subvolume.  Length is expressed in
50 * realtime extents, as is the block number.
51 */
52int					/* error */
53xfs_rtfree_extent(
54	struct xfs_trans	*tp,	/* transaction pointer */
55	xfs_rtblock_t		bno,	/* starting block number to free */
56	xfs_extlen_t		len);	/* length of extent freed */
57
58/*
59 * Initialize realtime fields in the mount structure.
60 */
61int					/* error */
62xfs_rtmount_init(
63	struct xfs_mount	*mp);	/* file system mount structure */
64void
65xfs_rtunmount_inodes(
66	struct xfs_mount	*mp);
67
68/*
69 * Get the bitmap and summary inodes into the mount structure
70 * at mount time.
71 */
72int					/* error */
73xfs_rtmount_inodes(
74	struct xfs_mount	*mp);	/* file system mount structure */
75
76/*
77 * Pick an extent for allocation at the start of a new realtime file.
78 * Use the sequence number stored in the atime field of the bitmap inode.
79 * Translate this to a fraction of the rtextents, and return the product
80 * of rtextents and the fraction.
81 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
82 */
83int					/* error */
84xfs_rtpick_extent(
85	struct xfs_mount	*mp,	/* file system mount point */
86	struct xfs_trans	*tp,	/* transaction pointer */
87	xfs_extlen_t		len,	/* allocation length (rtextents) */
88	xfs_rtblock_t		*pick);	/* result rt extent */
89
90/*
91 * Grow the realtime area of the filesystem.
92 */
93int
94xfs_growfs_rt(
95	struct xfs_mount	*mp,	/* file system mount structure */
96	xfs_growfs_rt_t		*in);	/* user supplied growfs struct */
97
98/*
99 * From xfs_rtbitmap.c
100 */
101int xfs_rtbuf_get(struct xfs_mount *mp, struct xfs_trans *tp,
102		  xfs_rtblock_t block, int issum, struct xfs_buf **bpp);
103int xfs_rtcheck_range(struct xfs_mount *mp, struct xfs_trans *tp,
104		      xfs_rtblock_t start, xfs_extlen_t len, int val,
105		      xfs_rtblock_t *new, int *stat);
106int xfs_rtfind_back(struct xfs_mount *mp, struct xfs_trans *tp,
107		    xfs_rtblock_t start, xfs_rtblock_t limit,
108		    xfs_rtblock_t *rtblock);
109int xfs_rtfind_forw(struct xfs_mount *mp, struct xfs_trans *tp,
110		    xfs_rtblock_t start, xfs_rtblock_t limit,
111		    xfs_rtblock_t *rtblock);
112int xfs_rtmodify_range(struct xfs_mount *mp, struct xfs_trans *tp,
113		       xfs_rtblock_t start, xfs_extlen_t len, int val);
114int xfs_rtmodify_summary_int(struct xfs_mount *mp, struct xfs_trans *tp,
115			     int log, xfs_rtblock_t bbno, int delta,
116			     xfs_buf_t **rbpp, xfs_fsblock_t *rsb,
117			     xfs_suminfo_t *sum);
118int xfs_rtmodify_summary(struct xfs_mount *mp, struct xfs_trans *tp, int log,
119			 xfs_rtblock_t bbno, int delta, xfs_buf_t **rbpp,
120			 xfs_fsblock_t *rsb);
121int xfs_rtfree_range(struct xfs_mount *mp, struct xfs_trans *tp,
122		     xfs_rtblock_t start, xfs_extlen_t len,
123		     struct xfs_buf **rbpp, xfs_fsblock_t *rsb);
124
125
126#else
127# define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb)  (ENOSYS)
128# define xfs_rtfree_extent(t,b,l)                       (ENOSYS)
129# define xfs_rtpick_extent(m,t,l,rb)                    (ENOSYS)
130# define xfs_growfs_rt(mp,in)                           (ENOSYS)
131static inline int		/* error */
132xfs_rtmount_init(
133	xfs_mount_t	*mp)	/* file system mount structure */
134{
135	if (mp->m_sb.sb_rblocks == 0)
136		return 0;
137
138	xfs_warn(mp, "Not built with CONFIG_XFS_RT");
139	return -ENOSYS;
140}
141# define xfs_rtmount_inodes(m)  (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
142# define xfs_rtunmount_inodes(m)
143#endif	/* CONFIG_XFS_RT */
144
145#endif	/* __XFS_RTALLOC_H__ */
146