Commit | Line | Data |
---|---|---|
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; | |
a46db608 | 22 | struct xfs_btree_cur; |
1da177e4 LT |
23 | struct xfs_mount; |
24 | struct xfs_perag; | |
25 | struct xfs_trans; | |
ed3b4d6c | 26 | struct xfs_busy_extent; |
1da177e4 LT |
27 | |
28 | /* | |
29 | * Freespace allocation types. Argument to xfs_alloc_[v]extent. | |
30 | */ | |
807cbbdb CH |
31 | #define XFS_ALLOCTYPE_ANY_AG 0x01 /* allocate anywhere, use rotor */ |
32 | #define XFS_ALLOCTYPE_FIRST_AG 0x02 /* ... start at ag 0 */ | |
33 | #define XFS_ALLOCTYPE_START_AG 0x04 /* anywhere, start in this a.g. */ | |
34 | #define XFS_ALLOCTYPE_THIS_AG 0x08 /* anywhere in this a.g. */ | |
35 | #define XFS_ALLOCTYPE_START_BNO 0x10 /* near this block else anywhere */ | |
36 | #define XFS_ALLOCTYPE_NEAR_BNO 0x20 /* in this a.g. and near this block */ | |
37 | #define XFS_ALLOCTYPE_THIS_BNO 0x40 /* at exactly this block */ | |
38 | ||
39 | /* this should become an enum again when the tracing code is fixed */ | |
40 | typedef unsigned int xfs_alloctype_t; | |
1da177e4 | 41 | |
0b1b213f CH |
42 | #define XFS_ALLOC_TYPES \ |
43 | { XFS_ALLOCTYPE_ANY_AG, "ANY_AG" }, \ | |
44 | { XFS_ALLOCTYPE_FIRST_AG, "FIRST_AG" }, \ | |
45 | { XFS_ALLOCTYPE_START_AG, "START_AG" }, \ | |
46 | { XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \ | |
47 | { XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \ | |
48 | { XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \ | |
49 | { XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" } | |
50 | ||
1da177e4 LT |
51 | /* |
52 | * Flags for xfs_alloc_fix_freelist. | |
53 | */ | |
54 | #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */ | |
d210a28c | 55 | #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/ |
1da177e4 | 56 | |
4be536de DC |
57 | /* |
58 | * In order to avoid ENOSPC-related deadlock caused by | |
59 | * out-of-order locking of AGF buffer (PV 947395), we place | |
60 | * constraints on the relationship among actual allocations for | |
61 | * data blocks, freelist blocks, and potential file data bmap | |
62 | * btree blocks. However, these restrictions may result in no | |
63 | * actual space allocated for a delayed extent, for example, a data | |
64 | * block in a certain AG is allocated but there is no additional | |
65 | * block for the additional bmap btree block due to a split of the | |
66 | * bmap btree of the file. The result of this may lead to an | |
67 | * infinite loop in xfssyncd when the file gets flushed to disk and | |
68 | * all delayed extents need to be actually allocated. To get around | |
69 | * this, we explicitly set aside a few blocks which will not be | |
70 | * reserved in delayed allocation. Considering the minimum number of | |
71 | * needed freelist blocks is 4 fsbs _per AG_, a potential split of file's bmap | |
72 | * btree requires 1 fsb, so we set the number of set-aside blocks | |
73 | * to 4 + 4*agcount. | |
74 | */ | |
75 | #define XFS_ALLOC_SET_ASIDE(mp) (4 + ((mp)->m_sb.sb_agcount * 4)) | |
76 | ||
14b064ce DC |
77 | /* |
78 | * When deciding how much space to allocate out of an AG, we limit the | |
79 | * allocation maximum size to the size the AG. However, we cannot use all the | |
80 | * blocks in the AG - some are permanently used by metadata. These | |
81 | * blocks are generally: | |
82 | * - the AG superblock, AGF, AGI and AGFL | |
83 | * - the AGF (bno and cnt) and AGI btree root blocks | |
84 | * - 4 blocks on the AGFL according to XFS_ALLOC_SET_ASIDE() limits | |
85 | * | |
86 | * The AG headers are sector sized, so the amount of space they take up is | |
87 | * dependent on filesystem geometry. The others are all single blocks. | |
88 | */ | |
89 | #define XFS_ALLOC_AG_MAX_USABLE(mp) \ | |
90 | ((mp)->m_sb.sb_agblocks - XFS_BB_TO_FSB(mp, XFS_FSS_TO_BB(mp, 4)) - 7) | |
91 | ||
92 | ||
1da177e4 LT |
93 | /* |
94 | * Argument structure for xfs_alloc routines. | |
95 | * This is turned into a structure to avoid having 20 arguments passed | |
96 | * down several levels of the stack. | |
97 | */ | |
98 | typedef struct xfs_alloc_arg { | |
99 | struct xfs_trans *tp; /* transaction pointer */ | |
100 | struct xfs_mount *mp; /* file system mount point */ | |
101 | struct xfs_buf *agbp; /* buffer for a.g. freelist header */ | |
102 | struct xfs_perag *pag; /* per-ag struct for this agno */ | |
103 | xfs_fsblock_t fsbno; /* file system block number */ | |
104 | xfs_agnumber_t agno; /* allocation group number */ | |
105 | xfs_agblock_t agbno; /* allocation group-relative block # */ | |
106 | xfs_extlen_t minlen; /* minimum size of extent */ | |
107 | xfs_extlen_t maxlen; /* maximum size of extent */ | |
108 | xfs_extlen_t mod; /* mod value for extent size */ | |
109 | xfs_extlen_t prod; /* prod value for extent size */ | |
110 | xfs_extlen_t minleft; /* min blocks must be left after us */ | |
111 | xfs_extlen_t total; /* total blocks needed in xaction */ | |
112 | xfs_extlen_t alignment; /* align answer to multiple of this */ | |
113 | xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ | |
114 | xfs_extlen_t len; /* output: actual size of extent */ | |
115 | xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */ | |
116 | xfs_alloctype_t otype; /* original allocation type */ | |
117 | char wasdel; /* set if allocation was prev delayed */ | |
118 | char wasfromfl; /* set if allocation is from freelist */ | |
c41564b5 | 119 | char isfl; /* set if is freelist blocks - !acctg */ |
1da177e4 | 120 | char userdata; /* set if this is user data */ |
d210a28c | 121 | xfs_fsblock_t firstblock; /* io first block allocated */ |
1da177e4 LT |
122 | } xfs_alloc_arg_t; |
123 | ||
124 | /* | |
125 | * Defines for userdata | |
126 | */ | |
127 | #define XFS_ALLOC_USERDATA 1 /* allocation is for user data*/ | |
128 | #define XFS_ALLOC_INITIAL_USER_DATA 2 /* special case start of file */ | |
129 | ||
6cc87645 DC |
130 | /* |
131 | * Find the length of the longest extent in an AG. | |
132 | */ | |
133 | xfs_extlen_t | |
134 | xfs_alloc_longest_free_extent(struct xfs_mount *mp, | |
135 | struct xfs_perag *pag); | |
1da177e4 LT |
136 | |
137 | #ifdef __KERNEL__ | |
847fff5c | 138 | void |
a46db608 | 139 | xfs_alloc_busy_insert(struct xfs_trans *tp, xfs_agnumber_t agno, |
55a7bc5a | 140 | xfs_agblock_t bno, xfs_extlen_t len, unsigned int flags); |
847fff5c BN |
141 | |
142 | void | |
e84661aa CH |
143 | xfs_alloc_busy_clear(struct xfs_mount *mp, struct list_head *list, |
144 | bool do_discard); | |
847fff5c | 145 | |
a46db608 CH |
146 | int |
147 | xfs_alloc_busy_search(struct xfs_mount *mp, xfs_agnumber_t agno, | |
148 | xfs_agblock_t bno, xfs_extlen_t len); | |
97d3ac75 CH |
149 | |
150 | void | |
151 | xfs_alloc_busy_reuse(struct xfs_mount *mp, xfs_agnumber_t agno, | |
152 | xfs_agblock_t fbno, xfs_extlen_t flen, bool userdata); | |
8a072a4d CH |
153 | |
154 | int | |
155 | xfs_busy_extent_ag_cmp(void *priv, struct list_head *a, struct list_head *b); | |
156 | ||
157 | static inline void xfs_alloc_busy_sort(struct list_head *list) | |
158 | { | |
159 | list_sort(NULL, list, xfs_busy_extent_ag_cmp); | |
160 | } | |
161 | ||
847fff5c BN |
162 | #endif /* __KERNEL__ */ |
163 | ||
1da177e4 LT |
164 | /* |
165 | * Compute and fill in value of m_ag_maxlevels. | |
166 | */ | |
167 | void | |
168 | xfs_alloc_compute_maxlevels( | |
169 | struct xfs_mount *mp); /* file system mount structure */ | |
170 | ||
171 | /* | |
172 | * Get a block from the freelist. | |
173 | * Returns with the buffer for the block gotten. | |
174 | */ | |
175 | int /* error */ | |
176 | xfs_alloc_get_freelist( | |
177 | struct xfs_trans *tp, /* transaction pointer */ | |
178 | struct xfs_buf *agbp, /* buffer containing the agf structure */ | |
92821e2b DC |
179 | xfs_agblock_t *bnop, /* block address retrieved from freelist */ |
180 | int btreeblk); /* destination is a AGF btree */ | |
1da177e4 LT |
181 | |
182 | /* | |
183 | * Log the given fields from the agf structure. | |
184 | */ | |
185 | void | |
186 | xfs_alloc_log_agf( | |
187 | struct xfs_trans *tp, /* transaction pointer */ | |
188 | struct xfs_buf *bp, /* buffer for a.g. freelist header */ | |
189 | int fields);/* mask of fields to be logged (XFS_AGF_...) */ | |
190 | ||
191 | /* | |
192 | * Interface for inode allocation to force the pag data to be initialized. | |
193 | */ | |
194 | int /* error */ | |
195 | xfs_alloc_pagf_init( | |
196 | struct xfs_mount *mp, /* file system mount structure */ | |
197 | struct xfs_trans *tp, /* transaction pointer */ | |
198 | xfs_agnumber_t agno, /* allocation group number */ | |
199 | int flags); /* XFS_ALLOC_FLAGS_... */ | |
200 | ||
201 | /* | |
202 | * Put the block on the freelist for the allocation group. | |
203 | */ | |
204 | int /* error */ | |
205 | xfs_alloc_put_freelist( | |
206 | struct xfs_trans *tp, /* transaction pointer */ | |
207 | struct xfs_buf *agbp, /* buffer for a.g. freelist header */ | |
208 | struct xfs_buf *agflbp,/* buffer for a.g. free block array */ | |
92821e2b DC |
209 | xfs_agblock_t bno, /* block being freed */ |
210 | int btreeblk); /* owner was a AGF btree */ | |
1da177e4 LT |
211 | |
212 | /* | |
213 | * Read in the allocation group header (free/alloc section). | |
214 | */ | |
215 | int /* error */ | |
216 | xfs_alloc_read_agf( | |
217 | struct xfs_mount *mp, /* mount point structure */ | |
218 | struct xfs_trans *tp, /* transaction pointer */ | |
219 | xfs_agnumber_t agno, /* allocation group number */ | |
220 | int flags, /* XFS_ALLOC_FLAG_... */ | |
221 | struct xfs_buf **bpp); /* buffer for the ag freelist header */ | |
222 | ||
223 | /* | |
224 | * Allocate an extent (variable-size). | |
225 | */ | |
226 | int /* error */ | |
227 | xfs_alloc_vextent( | |
228 | xfs_alloc_arg_t *args); /* allocation argument structure */ | |
229 | ||
230 | /* | |
231 | * Free an extent. | |
232 | */ | |
233 | int /* error */ | |
234 | xfs_free_extent( | |
235 | struct xfs_trans *tp, /* transaction pointer */ | |
236 | xfs_fsblock_t bno, /* starting block number of extent */ | |
237 | xfs_extlen_t len); /* length of extent */ | |
238 | ||
a46db608 CH |
239 | int /* error */ |
240 | xfs_alloc_lookup_le( | |
241 | struct xfs_btree_cur *cur, /* btree cursor */ | |
242 | xfs_agblock_t bno, /* starting block of extent */ | |
243 | xfs_extlen_t len, /* length of extent */ | |
244 | int *stat); /* success/failure */ | |
245 | ||
246 | int /* error */ | |
247 | xfs_alloc_get_rec( | |
248 | struct xfs_btree_cur *cur, /* btree cursor */ | |
249 | xfs_agblock_t *bno, /* output: starting block of extent */ | |
250 | xfs_extlen_t *len, /* output: length of extent */ | |
251 | int *stat); /* output: success/failure */ | |
252 | ||
1da177e4 | 253 | #endif /* __XFS_ALLOC_H__ */ |