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1da177e4 | 1 | /* |
3e57ecf6 | 2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
7b718769 | 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_BMAP_H__ | |
19 | #define __XFS_BMAP_H__ | |
20 | ||
21 | struct getbmap; | |
22 | struct xfs_bmbt_irec; | |
4eea22f0 | 23 | struct xfs_ifork; |
1da177e4 LT |
24 | struct xfs_inode; |
25 | struct xfs_mount; | |
26 | struct xfs_trans; | |
27 | ||
a8272ce0 DC |
28 | extern kmem_zone_t *xfs_bmap_free_item_zone; |
29 | ||
9799b438 DC |
30 | /* |
31 | * Argument structure for xfs_bmap_alloc. | |
32 | */ | |
33 | struct xfs_bmalloca { | |
34 | xfs_fsblock_t *firstblock; /* i/o first block allocated */ | |
35 | struct xfs_bmap_free *flist; /* bmap freelist */ | |
36 | struct xfs_trans *tp; /* transaction pointer */ | |
37 | struct xfs_inode *ip; /* incore inode pointer */ | |
38 | struct xfs_bmbt_irec prev; /* extent before the new one */ | |
39 | struct xfs_bmbt_irec got; /* extent after, or delayed */ | |
40 | ||
41 | xfs_fileoff_t offset; /* offset in file filling in */ | |
42 | xfs_extlen_t length; /* i/o length asked/allocated */ | |
43 | xfs_fsblock_t blkno; /* starting block of new extent */ | |
44 | ||
45 | struct xfs_btree_cur *cur; /* btree cursor */ | |
46 | xfs_extnum_t idx; /* current extent index */ | |
47 | int nallocs;/* number of extents alloc'd */ | |
48 | int logflags;/* flags for transaction logging */ | |
49 | ||
50 | xfs_extlen_t total; /* total blocks needed for xaction */ | |
51 | xfs_extlen_t minlen; /* minimum allocation size (blocks) */ | |
52 | xfs_extlen_t minleft; /* amount must be left after alloc */ | |
53 | bool eof; /* set if allocating past last extent */ | |
54 | bool wasdel; /* replacing a delayed allocation */ | |
55 | bool userdata;/* set if is user data */ | |
56 | bool aeof; /* allocated space at eof */ | |
57 | bool conv; /* overwriting unwritten extents */ | |
58 | int flags; | |
59 | }; | |
60 | ||
1da177e4 LT |
61 | /* |
62 | * List of extents to be free "later". | |
63 | * The list is kept sorted on xbf_startblock. | |
64 | */ | |
65 | typedef struct xfs_bmap_free_item | |
66 | { | |
67 | xfs_fsblock_t xbfi_startblock;/* starting fs block number */ | |
68 | xfs_extlen_t xbfi_blockcount;/* number of blocks in extent */ | |
69 | struct xfs_bmap_free_item *xbfi_next; /* link to next entry */ | |
70 | } xfs_bmap_free_item_t; | |
71 | ||
72 | /* | |
73 | * Header for free extent list. | |
b877e3d3 LM |
74 | * |
75 | * xbf_low is used by the allocator to activate the lowspace algorithm - | |
76 | * when free space is running low the extent allocator may choose to | |
77 | * allocate an extent from an AG without leaving sufficient space for | |
78 | * a btree split when inserting the new extent. In this case the allocator | |
79 | * will enable the lowspace algorithm which is supposed to allow further | |
80 | * allocations (such as btree splits and newroots) to allocate from | |
81 | * sequential AGs. In order to avoid locking AGs out of order the lowspace | |
82 | * algorithm will start searching for free space from AG 0. If the correct | |
83 | * transaction reservations have been made then this algorithm will eventually | |
84 | * find all the space it needs. | |
1da177e4 LT |
85 | */ |
86 | typedef struct xfs_bmap_free | |
87 | { | |
88 | xfs_bmap_free_item_t *xbf_first; /* list of to-be-free extents */ | |
89 | int xbf_count; /* count of items on list */ | |
b877e3d3 | 90 | int xbf_low; /* alloc in low mode */ |
1da177e4 LT |
91 | } xfs_bmap_free_t; |
92 | ||
93 | #define XFS_BMAP_MAX_NMAP 4 | |
94 | ||
95 | /* | |
c0dc7828 | 96 | * Flags for xfs_bmapi_* |
1da177e4 | 97 | */ |
c0dc7828 DC |
98 | #define XFS_BMAPI_ENTIRE 0x001 /* return entire extent, not trimmed */ |
99 | #define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */ | |
100 | #define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */ | |
101 | #define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */ | |
102 | #define XFS_BMAPI_IGSTATE 0x010 /* Ignore state - */ | |
1da177e4 | 103 | /* combine contig. space */ |
c0dc7828 | 104 | #define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */ |
44722352 DC |
105 | /* |
106 | * unwritten extent conversion - this needs write cache flushing and no additional | |
107 | * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts | |
108 | * from written to unwritten, otherwise convert from unwritten to written. | |
109 | */ | |
c0dc7828 | 110 | #define XFS_BMAPI_CONVERT 0x040 |
1da177e4 | 111 | |
0b1b213f | 112 | #define XFS_BMAPI_FLAGS \ |
0b1b213f CH |
113 | { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ |
114 | { XFS_BMAPI_METADATA, "METADATA" }, \ | |
0b1b213f | 115 | { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ |
0b1b213f CH |
116 | { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ |
117 | { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ | |
118 | { XFS_BMAPI_CONTIG, "CONTIG" }, \ | |
cf11da9c | 119 | { XFS_BMAPI_CONVERT, "CONVERT" } |
0b1b213f CH |
120 | |
121 | ||
a844f451 NS |
122 | static inline int xfs_bmapi_aflag(int w) |
123 | { | |
124 | return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0); | |
125 | } | |
1da177e4 LT |
126 | |
127 | /* | |
128 | * Special values for xfs_bmbt_irec_t br_startblock field. | |
129 | */ | |
130 | #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) | |
131 | #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) | |
132 | ||
a844f451 NS |
133 | static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp) |
134 | { | |
1da177e4 | 135 | ((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \ |
a844f451 NS |
136 | (flp)->xbf_low = 0, *(fbp) = NULLFSBLOCK); |
137 | } | |
1da177e4 | 138 | |
7574aa92 CH |
139 | /* |
140 | * Flags for xfs_bmap_add_extent*. | |
141 | */ | |
142 | #define BMAP_LEFT_CONTIG (1 << 0) | |
143 | #define BMAP_RIGHT_CONTIG (1 << 1) | |
144 | #define BMAP_LEFT_FILLING (1 << 2) | |
145 | #define BMAP_RIGHT_FILLING (1 << 3) | |
146 | #define BMAP_LEFT_DELAY (1 << 4) | |
147 | #define BMAP_RIGHT_DELAY (1 << 5) | |
148 | #define BMAP_LEFT_VALID (1 << 6) | |
149 | #define BMAP_RIGHT_VALID (1 << 7) | |
6ef35544 | 150 | #define BMAP_ATTRFORK (1 << 8) |
7574aa92 | 151 | |
0b1b213f CH |
152 | #define XFS_BMAP_EXT_FLAGS \ |
153 | { BMAP_LEFT_CONTIG, "LC" }, \ | |
154 | { BMAP_RIGHT_CONTIG, "RC" }, \ | |
155 | { BMAP_LEFT_FILLING, "LF" }, \ | |
156 | { BMAP_RIGHT_FILLING, "RF" }, \ | |
157 | { BMAP_ATTRFORK, "ATTR" } | |
1da177e4 | 158 | |
e1d8fb88 NJ |
159 | |
160 | /* | |
161 | * This macro is used to determine how many extents will be shifted | |
162 | * in one write transaction. We could require two splits, | |
163 | * an extent move on the first and an extent merge on the second, | |
164 | * So it is proper that one extent is shifted inside write transaction | |
165 | * at a time. | |
166 | */ | |
167 | #define XFS_BMAP_MAX_SHIFT_EXTENTS 1 | |
168 | ||
a904b1ca NJ |
169 | enum shift_direction { |
170 | SHIFT_LEFT = 0, | |
171 | SHIFT_RIGHT, | |
172 | }; | |
173 | ||
b49a0c18 | 174 | #ifdef DEBUG |
d952e2f8 CH |
175 | void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt, |
176 | int whichfork, unsigned long caller_ip); | |
3a59c94c | 177 | #define XFS_BMAP_TRACE_EXLIST(ip,c,w) \ |
0b1b213f CH |
178 | xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_) |
179 | #else | |
3a59c94c | 180 | #define XFS_BMAP_TRACE_EXLIST(ip,c,w) |
0b1b213f | 181 | #endif |
1da177e4 | 182 | |
d952e2f8 | 183 | int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); |
f3508bcd | 184 | void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork); |
d952e2f8 CH |
185 | void xfs_bmap_add_free(xfs_fsblock_t bno, xfs_filblks_t len, |
186 | struct xfs_bmap_free *flist, struct xfs_mount *mp); | |
187 | void xfs_bmap_cancel(struct xfs_bmap_free *flist); | |
aa5d95c1 DC |
188 | int xfs_bmap_finish(struct xfs_trans **tp, struct xfs_bmap_free *flist, |
189 | int *committed); | |
d952e2f8 CH |
190 | void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork); |
191 | int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip, | |
192 | xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork); | |
193 | int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip, | |
194 | xfs_fileoff_t *last_block, int whichfork); | |
7fb2cd4d ES |
195 | int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused, |
196 | int whichfork); | |
d952e2f8 CH |
197 | int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork); |
198 | int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip, | |
199 | int whichfork); | |
5c8ed202 DC |
200 | int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno, |
201 | xfs_filblks_t len, struct xfs_bmbt_irec *mval, | |
202 | int *nmap, int flags); | |
4403280a CH |
203 | int xfs_bmapi_delay(struct xfs_inode *ip, xfs_fileoff_t bno, |
204 | xfs_filblks_t len, struct xfs_bmbt_irec *mval, | |
205 | int *nmap, int flags); | |
c0dc7828 DC |
206 | int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, |
207 | xfs_fileoff_t bno, xfs_filblks_t len, int flags, | |
208 | xfs_fsblock_t *firstblock, xfs_extlen_t total, | |
209 | struct xfs_bmbt_irec *mval, int *nmap, | |
210 | struct xfs_bmap_free *flist); | |
d952e2f8 CH |
211 | int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, |
212 | xfs_fileoff_t bno, xfs_filblks_t len, int flags, | |
213 | xfs_extnum_t nexts, xfs_fsblock_t *firstblock, | |
214 | struct xfs_bmap_free *flist, int *done); | |
215 | int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx, | |
216 | xfs_extnum_t num); | |
217 | uint xfs_default_attroffset(struct xfs_inode *ip); | |
e1d8fb88 | 218 | int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip, |
a904b1ca NJ |
219 | xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, |
220 | int *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock, | |
221 | struct xfs_bmap_free *flist, enum shift_direction direction, | |
222 | int num_exts); | |
223 | int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset); | |
1a5902c5 | 224 | |
1da177e4 | 225 | #endif /* __XFS_BMAP_H__ */ |