2 * Copyright (c) 2000-2002,2005 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_ALLOC_H__
19 #define __XFS_ALLOC_H__
27 extern struct workqueue_struct
*xfs_alloc_wq
;
30 * Freespace allocation types. Argument to xfs_alloc_[v]extent.
32 #define XFS_ALLOCTYPE_FIRST_AG 0x02 /* ... start at ag 0 */
33 #define XFS_ALLOCTYPE_THIS_AG 0x08 /* anywhere in this a.g. */
34 #define XFS_ALLOCTYPE_START_BNO 0x10 /* near this block else anywhere */
35 #define XFS_ALLOCTYPE_NEAR_BNO 0x20 /* in this a.g. and near this block */
36 #define XFS_ALLOCTYPE_THIS_BNO 0x40 /* at exactly this block */
38 /* this should become an enum again when the tracing code is fixed */
39 typedef unsigned int xfs_alloctype_t
;
41 #define XFS_ALLOC_TYPES \
42 { XFS_ALLOCTYPE_FIRST_AG, "FIRST_AG" }, \
43 { XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \
44 { XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \
45 { XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \
46 { XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" }
49 * Flags for xfs_alloc_fix_freelist.
51 #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */
52 #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/
53 #define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */
54 #define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */
55 #define XFS_ALLOC_FLAG_CHECK 0x00000010 /* test only, don't modify args */
58 * Argument structure for xfs_alloc routines.
59 * This is turned into a structure to avoid having 20 arguments passed
60 * down several levels of the stack.
62 typedef struct xfs_alloc_arg
{
63 struct xfs_trans
*tp
; /* transaction pointer */
64 struct xfs_mount
*mp
; /* file system mount point */
65 struct xfs_buf
*agbp
; /* buffer for a.g. freelist header */
66 struct xfs_perag
*pag
; /* per-ag struct for this agno */
67 struct xfs_inode
*ip
; /* for userdata zeroing method */
68 xfs_fsblock_t fsbno
; /* file system block number */
69 xfs_agnumber_t agno
; /* allocation group number */
70 xfs_agblock_t agbno
; /* allocation group-relative block # */
71 xfs_extlen_t minlen
; /* minimum size of extent */
72 xfs_extlen_t maxlen
; /* maximum size of extent */
73 xfs_extlen_t mod
; /* mod value for extent size */
74 xfs_extlen_t prod
; /* prod value for extent size */
75 xfs_extlen_t minleft
; /* min blocks must be left after us */
76 xfs_extlen_t total
; /* total blocks needed in xaction */
77 xfs_extlen_t alignment
; /* align answer to multiple of this */
78 xfs_extlen_t minalignslop
; /* slop for minlen+alignment calcs */
79 xfs_agblock_t min_agbno
; /* set an agbno range for NEAR allocs */
80 xfs_agblock_t max_agbno
; /* ... */
81 xfs_extlen_t len
; /* output: actual size of extent */
82 xfs_alloctype_t type
; /* allocation type XFS_ALLOCTYPE_... */
83 xfs_alloctype_t otype
; /* original allocation type */
84 int datatype
; /* mask defining data type treatment */
85 char wasdel
; /* set if allocation was prev delayed */
86 char wasfromfl
; /* set if allocation is from freelist */
87 xfs_fsblock_t firstblock
; /* io first block allocated */
88 struct xfs_owner_info oinfo
; /* owner of blocks being allocated */
89 enum xfs_ag_resv_type resv
; /* block reservation to use */
93 * Defines for datatype
95 #define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/
96 #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */
97 #define XFS_ALLOC_USERDATA_ZERO (1 << 2)/* zero extent on allocation */
98 #define XFS_ALLOC_NOBUSY (1 << 3)/* Busy extents not allowed */
101 xfs_alloc_is_userdata(int datatype
)
103 return (datatype
& ~XFS_ALLOC_NOBUSY
) != 0;
107 xfs_alloc_allow_busy_reuse(int datatype
)
109 return (datatype
& XFS_ALLOC_NOBUSY
) == 0;
112 /* freespace limit calculations */
113 #define XFS_ALLOC_AGFL_RESERVE 4
114 unsigned int xfs_alloc_set_aside(struct xfs_mount
*mp
);
115 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount
*mp
);
117 xfs_extlen_t
xfs_alloc_longest_free_extent(struct xfs_mount
*mp
,
118 struct xfs_perag
*pag
, xfs_extlen_t need
,
119 xfs_extlen_t reserved
);
120 unsigned int xfs_alloc_min_freelist(struct xfs_mount
*mp
,
121 struct xfs_perag
*pag
);
124 * Compute and fill in value of m_ag_maxlevels.
127 xfs_alloc_compute_maxlevels(
128 struct xfs_mount
*mp
); /* file system mount structure */
131 * Get a block from the freelist.
132 * Returns with the buffer for the block gotten.
135 xfs_alloc_get_freelist(
136 struct xfs_trans
*tp
, /* transaction pointer */
137 struct xfs_buf
*agbp
, /* buffer containing the agf structure */
138 xfs_agblock_t
*bnop
, /* block address retrieved from freelist */
139 int btreeblk
); /* destination is a AGF btree */
142 * Log the given fields from the agf structure.
146 struct xfs_trans
*tp
, /* transaction pointer */
147 struct xfs_buf
*bp
, /* buffer for a.g. freelist header */
148 int fields
);/* mask of fields to be logged (XFS_AGF_...) */
151 * Interface for inode allocation to force the pag data to be initialized.
155 struct xfs_mount
*mp
, /* file system mount structure */
156 struct xfs_trans
*tp
, /* transaction pointer */
157 xfs_agnumber_t agno
, /* allocation group number */
158 int flags
); /* XFS_ALLOC_FLAGS_... */
161 * Put the block on the freelist for the allocation group.
164 xfs_alloc_put_freelist(
165 struct xfs_trans
*tp
, /* transaction pointer */
166 struct xfs_buf
*agbp
, /* buffer for a.g. freelist header */
167 struct xfs_buf
*agflbp
,/* buffer for a.g. free block array */
168 xfs_agblock_t bno
, /* block being freed */
169 int btreeblk
); /* owner was a AGF btree */
172 * Read in the allocation group header (free/alloc section).
176 struct xfs_mount
*mp
, /* mount point structure */
177 struct xfs_trans
*tp
, /* transaction pointer */
178 xfs_agnumber_t agno
, /* allocation group number */
179 int flags
, /* XFS_ALLOC_FLAG_... */
180 struct xfs_buf
**bpp
); /* buffer for the ag freelist header */
183 * Allocate an extent (variable-size).
187 xfs_alloc_arg_t
*args
); /* allocation argument structure */
194 struct xfs_trans
*tp
, /* transaction pointer */
195 xfs_fsblock_t bno
, /* starting block number of extent */
196 xfs_extlen_t len
, /* length of extent */
197 struct xfs_owner_info
*oinfo
, /* extent owner */
198 enum xfs_ag_resv_type type
); /* block reservation type */
202 struct xfs_btree_cur
*cur
, /* btree cursor */
203 xfs_agblock_t bno
, /* starting block of extent */
204 xfs_extlen_t len
, /* length of extent */
205 int *stat
); /* success/failure */
209 struct xfs_btree_cur
*cur
, /* btree cursor */
210 xfs_agblock_t
*bno
, /* output: starting block of extent */
211 xfs_extlen_t
*len
, /* output: length of extent */
212 int *stat
); /* output: success/failure */
214 int xfs_read_agf(struct xfs_mount
*mp
, struct xfs_trans
*tp
,
215 xfs_agnumber_t agno
, int flags
, struct xfs_buf
**bpp
);
216 int xfs_alloc_read_agfl(struct xfs_mount
*mp
, struct xfs_trans
*tp
,
217 xfs_agnumber_t agno
, struct xfs_buf
**bpp
);
218 int xfs_alloc_fix_freelist(struct xfs_alloc_arg
*args
, int flags
);
219 int xfs_free_extent_fix_freelist(struct xfs_trans
*tp
, xfs_agnumber_t agno
,
220 struct xfs_buf
**agbp
);
222 xfs_extlen_t
xfs_prealloc_blocks(struct xfs_mount
*mp
);
224 typedef int (*xfs_alloc_query_range_fn
)(
225 struct xfs_btree_cur
*cur
,
226 struct xfs_alloc_rec_incore
*rec
,
229 int xfs_alloc_query_range(struct xfs_btree_cur
*cur
,
230 struct xfs_alloc_rec_incore
*low_rec
,
231 struct xfs_alloc_rec_incore
*high_rec
,
232 xfs_alloc_query_range_fn fn
, void *priv
);
233 int xfs_alloc_query_all(struct xfs_btree_cur
*cur
, xfs_alloc_query_range_fn fn
,
235 xfs_agblock_t
xfs_ag_block_count(struct xfs_mount
*mp
, xfs_agnumber_t agno
);
236 bool xfs_verify_agbno(struct xfs_mount
*mp
, xfs_agnumber_t agno
,
237 xfs_agblock_t agbno
);
238 bool xfs_verify_fsbno(struct xfs_mount
*mp
, xfs_fsblock_t fsbno
);
240 #endif /* __XFS_ALLOC_H__ */