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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 LT |
17 | */ |
18 | #ifndef __XFS_ALLOC_H__ | |
19 | #define __XFS_ALLOC_H__ | |
20 | ||
21 | struct xfs_buf; | |
22 | struct xfs_mount; | |
23 | struct xfs_perag; | |
24 | struct xfs_trans; | |
25 | ||
26 | /* | |
27 | * Freespace allocation types. Argument to xfs_alloc_[v]extent. | |
28 | */ | |
29 | typedef enum xfs_alloctype | |
30 | { | |
31 | XFS_ALLOCTYPE_ANY_AG, /* allocate anywhere, use rotor */ | |
32 | XFS_ALLOCTYPE_FIRST_AG, /* ... start at ag 0 */ | |
33 | XFS_ALLOCTYPE_START_AG, /* anywhere, start in this a.g. */ | |
34 | XFS_ALLOCTYPE_THIS_AG, /* anywhere in this a.g. */ | |
35 | XFS_ALLOCTYPE_START_BNO, /* near this block else anywhere */ | |
36 | XFS_ALLOCTYPE_NEAR_BNO, /* in this a.g. and near this block */ | |
37 | XFS_ALLOCTYPE_THIS_BNO /* at exactly this block */ | |
38 | } xfs_alloctype_t; | |
39 | ||
0b1b213f CH |
40 | #define XFS_ALLOC_TYPES \ |
41 | { XFS_ALLOCTYPE_ANY_AG, "ANY_AG" }, \ | |
42 | { XFS_ALLOCTYPE_FIRST_AG, "FIRST_AG" }, \ | |
43 | { XFS_ALLOCTYPE_START_AG, "START_AG" }, \ | |
44 | { XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \ | |
45 | { XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \ | |
46 | { XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \ | |
47 | { XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" } | |
48 | ||
1da177e4 LT |
49 | /* |
50 | * Flags for xfs_alloc_fix_freelist. | |
51 | */ | |
52 | #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */ | |
d210a28c | 53 | #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/ |
1da177e4 | 54 | |
4be536de DC |
55 | /* |
56 | * In order to avoid ENOSPC-related deadlock caused by | |
57 | * out-of-order locking of AGF buffer (PV 947395), we place | |
58 | * constraints on the relationship among actual allocations for | |
59 | * data blocks, freelist blocks, and potential file data bmap | |
60 | * btree blocks. However, these restrictions may result in no | |
61 | * actual space allocated for a delayed extent, for example, a data | |
62 | * block in a certain AG is allocated but there is no additional | |
63 | * block for the additional bmap btree block due to a split of the | |
64 | * bmap btree of the file. The result of this may lead to an | |
65 | * infinite loop in xfssyncd when the file gets flushed to disk and | |
66 | * all delayed extents need to be actually allocated. To get around | |
67 | * this, we explicitly set aside a few blocks which will not be | |
68 | * reserved in delayed allocation. Considering the minimum number of | |
69 | * needed freelist blocks is 4 fsbs _per AG_, a potential split of file's bmap | |
70 | * btree requires 1 fsb, so we set the number of set-aside blocks | |
71 | * to 4 + 4*agcount. | |
72 | */ | |
73 | #define XFS_ALLOC_SET_ASIDE(mp) (4 + ((mp)->m_sb.sb_agcount * 4)) | |
74 | ||
1da177e4 LT |
75 | /* |
76 | * Argument structure for xfs_alloc routines. | |
77 | * This is turned into a structure to avoid having 20 arguments passed | |
78 | * down several levels of the stack. | |
79 | */ | |
80 | typedef struct xfs_alloc_arg { | |
81 | struct xfs_trans *tp; /* transaction pointer */ | |
82 | struct xfs_mount *mp; /* file system mount point */ | |
83 | struct xfs_buf *agbp; /* buffer for a.g. freelist header */ | |
84 | struct xfs_perag *pag; /* per-ag struct for this agno */ | |
85 | xfs_fsblock_t fsbno; /* file system block number */ | |
86 | xfs_agnumber_t agno; /* allocation group number */ | |
87 | xfs_agblock_t agbno; /* allocation group-relative block # */ | |
88 | xfs_extlen_t minlen; /* minimum size of extent */ | |
89 | xfs_extlen_t maxlen; /* maximum size of extent */ | |
90 | xfs_extlen_t mod; /* mod value for extent size */ | |
91 | xfs_extlen_t prod; /* prod value for extent size */ | |
92 | xfs_extlen_t minleft; /* min blocks must be left after us */ | |
93 | xfs_extlen_t total; /* total blocks needed in xaction */ | |
94 | xfs_extlen_t alignment; /* align answer to multiple of this */ | |
95 | xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ | |
96 | xfs_extlen_t len; /* output: actual size of extent */ | |
97 | xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */ | |
98 | xfs_alloctype_t otype; /* original allocation type */ | |
99 | char wasdel; /* set if allocation was prev delayed */ | |
100 | char wasfromfl; /* set if allocation is from freelist */ | |
c41564b5 | 101 | char isfl; /* set if is freelist blocks - !acctg */ |
1da177e4 | 102 | char userdata; /* set if this is user data */ |
d210a28c | 103 | xfs_fsblock_t firstblock; /* io first block allocated */ |
1da177e4 LT |
104 | } xfs_alloc_arg_t; |
105 | ||
106 | /* | |
107 | * Defines for userdata | |
108 | */ | |
109 | #define XFS_ALLOC_USERDATA 1 /* allocation is for user data*/ | |
110 | #define XFS_ALLOC_INITIAL_USER_DATA 2 /* special case start of file */ | |
111 | ||
6cc87645 DC |
112 | /* |
113 | * Find the length of the longest extent in an AG. | |
114 | */ | |
115 | xfs_extlen_t | |
116 | xfs_alloc_longest_free_extent(struct xfs_mount *mp, | |
117 | struct xfs_perag *pag); | |
1da177e4 LT |
118 | |
119 | #ifdef __KERNEL__ | |
120 | ||
847fff5c BN |
121 | void |
122 | xfs_alloc_mark_busy(xfs_trans_t *tp, | |
123 | xfs_agnumber_t agno, | |
124 | xfs_agblock_t bno, | |
125 | xfs_extlen_t len); | |
126 | ||
127 | void | |
128 | xfs_alloc_clear_busy(xfs_trans_t *tp, | |
129 | xfs_agnumber_t ag, | |
130 | int idx); | |
131 | ||
132 | #endif /* __KERNEL__ */ | |
133 | ||
1da177e4 LT |
134 | /* |
135 | * Compute and fill in value of m_ag_maxlevels. | |
136 | */ | |
137 | void | |
138 | xfs_alloc_compute_maxlevels( | |
139 | struct xfs_mount *mp); /* file system mount structure */ | |
140 | ||
141 | /* | |
142 | * Get a block from the freelist. | |
143 | * Returns with the buffer for the block gotten. | |
144 | */ | |
145 | int /* error */ | |
146 | xfs_alloc_get_freelist( | |
147 | struct xfs_trans *tp, /* transaction pointer */ | |
148 | struct xfs_buf *agbp, /* buffer containing the agf structure */ | |
92821e2b DC |
149 | xfs_agblock_t *bnop, /* block address retrieved from freelist */ |
150 | int btreeblk); /* destination is a AGF btree */ | |
1da177e4 LT |
151 | |
152 | /* | |
153 | * Log the given fields from the agf structure. | |
154 | */ | |
155 | void | |
156 | xfs_alloc_log_agf( | |
157 | struct xfs_trans *tp, /* transaction pointer */ | |
158 | struct xfs_buf *bp, /* buffer for a.g. freelist header */ | |
159 | int fields);/* mask of fields to be logged (XFS_AGF_...) */ | |
160 | ||
161 | /* | |
162 | * Interface for inode allocation to force the pag data to be initialized. | |
163 | */ | |
164 | int /* error */ | |
165 | xfs_alloc_pagf_init( | |
166 | struct xfs_mount *mp, /* file system mount structure */ | |
167 | struct xfs_trans *tp, /* transaction pointer */ | |
168 | xfs_agnumber_t agno, /* allocation group number */ | |
169 | int flags); /* XFS_ALLOC_FLAGS_... */ | |
170 | ||
171 | /* | |
172 | * Put the block on the freelist for the allocation group. | |
173 | */ | |
174 | int /* error */ | |
175 | xfs_alloc_put_freelist( | |
176 | struct xfs_trans *tp, /* transaction pointer */ | |
177 | struct xfs_buf *agbp, /* buffer for a.g. freelist header */ | |
178 | struct xfs_buf *agflbp,/* buffer for a.g. free block array */ | |
92821e2b DC |
179 | xfs_agblock_t bno, /* block being freed */ |
180 | int btreeblk); /* owner was a AGF btree */ | |
1da177e4 LT |
181 | |
182 | /* | |
183 | * Read in the allocation group header (free/alloc section). | |
184 | */ | |
185 | int /* error */ | |
186 | xfs_alloc_read_agf( | |
187 | struct xfs_mount *mp, /* mount point structure */ | |
188 | struct xfs_trans *tp, /* transaction pointer */ | |
189 | xfs_agnumber_t agno, /* allocation group number */ | |
190 | int flags, /* XFS_ALLOC_FLAG_... */ | |
191 | struct xfs_buf **bpp); /* buffer for the ag freelist header */ | |
192 | ||
193 | /* | |
194 | * Allocate an extent (variable-size). | |
195 | */ | |
196 | int /* error */ | |
197 | xfs_alloc_vextent( | |
198 | xfs_alloc_arg_t *args); /* allocation argument structure */ | |
199 | ||
200 | /* | |
201 | * Free an extent. | |
202 | */ | |
203 | int /* error */ | |
204 | xfs_free_extent( | |
205 | struct xfs_trans *tp, /* transaction pointer */ | |
206 | xfs_fsblock_t bno, /* starting block number of extent */ | |
207 | xfs_extlen_t len); /* length of extent */ | |
208 | ||
1da177e4 | 209 | #endif /* __XFS_ALLOC_H__ */ |