tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Copyright (c) 2000-2002,2005 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_ALLOC_H__
19#define __XFS_ALLOC_H__
20
21struct xfs_buf;
22struct xfs_btree_cur;
23struct xfs_mount;
24struct xfs_perag;
25struct xfs_trans;
26
27extern struct workqueue_struct *xfs_alloc_wq;
28
29/*
30 * Freespace allocation types. Argument to xfs_alloc_[v]extent.
31 */
32#define XFS_ALLOCTYPE_ANY_AG 0x01 /* allocate anywhere, use rotor */
33#define XFS_ALLOCTYPE_FIRST_AG 0x02 /* ... start at ag 0 */
34#define XFS_ALLOCTYPE_START_AG 0x04 /* anywhere, start in this a.g. */
35#define XFS_ALLOCTYPE_THIS_AG 0x08 /* anywhere in this a.g. */
36#define XFS_ALLOCTYPE_START_BNO 0x10 /* near this block else anywhere */
37#define XFS_ALLOCTYPE_NEAR_BNO 0x20 /* in this a.g. and near this block */
38#define XFS_ALLOCTYPE_THIS_BNO 0x40 /* at exactly this block */
39
40/* this should become an enum again when the tracing code is fixed */
41typedef unsigned int xfs_alloctype_t;
42
43#define XFS_ALLOC_TYPES \
44 { XFS_ALLOCTYPE_ANY_AG, "ANY_AG" }, \
45 { XFS_ALLOCTYPE_FIRST_AG, "FIRST_AG" }, \
46 { XFS_ALLOCTYPE_START_AG, "START_AG" }, \
47 { XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \
48 { XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \
49 { XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \
50 { XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" }
51
52/*
53 * Flags for xfs_alloc_fix_freelist.
54 */
55#define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */
56#define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/
57#define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */
58#define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */
59#define XFS_ALLOC_FLAG_CHECK 0x00000010 /* test only, don't modify args */
60
61/*
62 * Argument structure for xfs_alloc routines.
63 * This is turned into a structure to avoid having 20 arguments passed
64 * down several levels of the stack.
65 */
66typedef struct xfs_alloc_arg {
67 struct xfs_trans *tp; /* transaction pointer */
68 struct xfs_mount *mp; /* file system mount point */
69 struct xfs_buf *agbp; /* buffer for a.g. freelist header */
70 struct xfs_perag *pag; /* per-ag struct for this agno */
71 struct xfs_inode *ip; /* for userdata zeroing method */
72 xfs_fsblock_t fsbno; /* file system block number */
73 xfs_agnumber_t agno; /* allocation group number */
74 xfs_agblock_t agbno; /* allocation group-relative block # */
75 xfs_extlen_t minlen; /* minimum size of extent */
76 xfs_extlen_t maxlen; /* maximum size of extent */
77 xfs_extlen_t mod; /* mod value for extent size */
78 xfs_extlen_t prod; /* prod value for extent size */
79 xfs_extlen_t minleft; /* min blocks must be left after us */
80 xfs_extlen_t total; /* total blocks needed in xaction */
81 xfs_extlen_t alignment; /* align answer to multiple of this */
82 xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */
83 xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */
84 xfs_agblock_t max_agbno; /* ... */
85 xfs_extlen_t len; /* output: actual size of extent */
86 xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */
87 xfs_alloctype_t otype; /* original allocation type */
88 int datatype; /* mask defining data type treatment */
89 char wasdel; /* set if allocation was prev delayed */
90 char wasfromfl; /* set if allocation is from freelist */
91 xfs_fsblock_t firstblock; /* io first block allocated */
92 struct xfs_owner_info oinfo; /* owner of blocks being allocated */
93 enum xfs_ag_resv_type resv; /* block reservation to use */
94} xfs_alloc_arg_t;
95
96/*
97 * Defines for datatype
98 */
99#define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/
100#define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */
101#define XFS_ALLOC_USERDATA_ZERO (1 << 2)/* zero extent on allocation */
102#define XFS_ALLOC_NOBUSY (1 << 3)/* Busy extents not allowed */
103
104static inline bool
105xfs_alloc_is_userdata(int datatype)
106{
107 return (datatype & ~XFS_ALLOC_NOBUSY) != 0;
108}
109
110static inline bool
111xfs_alloc_allow_busy_reuse(int datatype)
112{
113 return (datatype & XFS_ALLOC_NOBUSY) == 0;
114}
115
116/* freespace limit calculations */
117#define XFS_ALLOC_AGFL_RESERVE 4
118unsigned int xfs_alloc_set_aside(struct xfs_mount *mp);
119unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp);
120
121xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_mount *mp,
122 struct xfs_perag *pag, xfs_extlen_t need,
123 xfs_extlen_t reserved);
124unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp,
125 struct xfs_perag *pag);
126
127/*
128 * Compute and fill in value of m_ag_maxlevels.
129 */
130void
131xfs_alloc_compute_maxlevels(
132 struct xfs_mount *mp); /* file system mount structure */
133
134/*
135 * Get a block from the freelist.
136 * Returns with the buffer for the block gotten.
137 */
138int /* error */
139xfs_alloc_get_freelist(
140 struct xfs_trans *tp, /* transaction pointer */
141 struct xfs_buf *agbp, /* buffer containing the agf structure */
142 xfs_agblock_t *bnop, /* block address retrieved from freelist */
143 int btreeblk); /* destination is a AGF btree */
144
145/*
146 * Log the given fields from the agf structure.
147 */
148void
149xfs_alloc_log_agf(
150 struct xfs_trans *tp, /* transaction pointer */
151 struct xfs_buf *bp, /* buffer for a.g. freelist header */
152 int fields);/* mask of fields to be logged (XFS_AGF_...) */
153
154/*
155 * Interface for inode allocation to force the pag data to be initialized.
156 */
157int /* error */
158xfs_alloc_pagf_init(
159 struct xfs_mount *mp, /* file system mount structure */
160 struct xfs_trans *tp, /* transaction pointer */
161 xfs_agnumber_t agno, /* allocation group number */
162 int flags); /* XFS_ALLOC_FLAGS_... */
163
164/*
165 * Put the block on the freelist for the allocation group.
166 */
167int /* error */
168xfs_alloc_put_freelist(
169 struct xfs_trans *tp, /* transaction pointer */
170 struct xfs_buf *agbp, /* buffer for a.g. freelist header */
171 struct xfs_buf *agflbp,/* buffer for a.g. free block array */
172 xfs_agblock_t bno, /* block being freed */
173 int btreeblk); /* owner was a AGF btree */
174
175/*
176 * Read in the allocation group header (free/alloc section).
177 */
178int /* error */
179xfs_alloc_read_agf(
180 struct xfs_mount *mp, /* mount point structure */
181 struct xfs_trans *tp, /* transaction pointer */
182 xfs_agnumber_t agno, /* allocation group number */
183 int flags, /* XFS_ALLOC_FLAG_... */
184 struct xfs_buf **bpp); /* buffer for the ag freelist header */
185
186/*
187 * Allocate an extent (variable-size).
188 */
189int /* error */
190xfs_alloc_vextent(
191 xfs_alloc_arg_t *args); /* allocation argument structure */
192
193/*
194 * Free an extent.
195 */
196int /* error */
197xfs_free_extent(
198 struct xfs_trans *tp, /* transaction pointer */
199 xfs_fsblock_t bno, /* starting block number of extent */
200 xfs_extlen_t len, /* length of extent */
201 struct xfs_owner_info *oinfo, /* extent owner */
202 enum xfs_ag_resv_type type); /* block reservation type */
203
204int /* error */
205xfs_alloc_lookup_ge(
206 struct xfs_btree_cur *cur, /* btree cursor */
207 xfs_agblock_t bno, /* starting block of extent */
208 xfs_extlen_t len, /* length of extent */
209 int *stat); /* success/failure */
210
211int /* error */
212xfs_alloc_get_rec(
213 struct xfs_btree_cur *cur, /* btree cursor */
214 xfs_agblock_t *bno, /* output: starting block of extent */
215 xfs_extlen_t *len, /* output: length of extent */
216 int *stat); /* output: success/failure */
217
218int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,
219 xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);
220int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags);
221int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno,
222 struct xfs_buf **agbp);
223
224xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
225
226#endif /* __XFS_ALLOC_H__ */