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1 | /* | |
2 | * Copyright (c) 2000-2003,2005 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_BMAP_H__ | |
19 | #define __XFS_BMAP_H__ | |
20 | ||
21 | struct getbmap; | |
22 | struct xfs_bmbt_irec; | |
23 | struct xfs_inode; | |
24 | struct xfs_mount; | |
25 | struct xfs_trans; | |
26 | ||
27 | /* | |
28 | * List of extents to be free "later". | |
29 | * The list is kept sorted on xbf_startblock. | |
30 | */ | |
31 | typedef struct xfs_bmap_free_item | |
32 | { | |
33 | xfs_fsblock_t xbfi_startblock;/* starting fs block number */ | |
34 | xfs_extlen_t xbfi_blockcount;/* number of blocks in extent */ | |
35 | struct xfs_bmap_free_item *xbfi_next; /* link to next entry */ | |
36 | } xfs_bmap_free_item_t; | |
37 | ||
38 | /* | |
39 | * Header for free extent list. | |
40 | */ | |
41 | typedef struct xfs_bmap_free | |
42 | { | |
43 | xfs_bmap_free_item_t *xbf_first; /* list of to-be-free extents */ | |
44 | int xbf_count; /* count of items on list */ | |
45 | int xbf_low; /* kludge: alloc in low mode */ | |
46 | } xfs_bmap_free_t; | |
47 | ||
48 | #define XFS_BMAP_MAX_NMAP 4 | |
49 | ||
50 | /* | |
51 | * Flags for xfs_bmapi | |
52 | */ | |
53 | #define XFS_BMAPI_WRITE 0x001 /* write operation: allocate space */ | |
54 | #define XFS_BMAPI_DELAY 0x002 /* delayed write operation */ | |
55 | #define XFS_BMAPI_ENTIRE 0x004 /* return entire extent, not trimmed */ | |
56 | #define XFS_BMAPI_METADATA 0x008 /* mapping metadata not user data */ | |
57 | #define XFS_BMAPI_EXACT 0x010 /* allocate only to spec'd bounds */ | |
58 | #define XFS_BMAPI_ATTRFORK 0x020 /* use attribute fork not data */ | |
59 | #define XFS_BMAPI_ASYNC 0x040 /* bunmapi xactions can be async */ | |
60 | #define XFS_BMAPI_RSVBLOCKS 0x080 /* OK to alloc. reserved data blocks */ | |
61 | #define XFS_BMAPI_PREALLOC 0x100 /* preallocation op: unwritten space */ | |
62 | #define XFS_BMAPI_IGSTATE 0x200 /* Ignore state - */ | |
63 | /* combine contig. space */ | |
64 | #define XFS_BMAPI_CONTIG 0x400 /* must allocate only one extent */ | |
65 | /* XFS_BMAPI_DIRECT_IO 0x800 */ | |
66 | #define XFS_BMAPI_CONVERT 0x1000 /* unwritten extent conversion - */ | |
67 | /* need write cache flushing and no */ | |
68 | /* additional allocation alignments */ | |
69 | ||
70 | #define XFS_BMAPI_AFLAG(w) xfs_bmapi_aflag(w) | |
71 | static inline int xfs_bmapi_aflag(int w) | |
72 | { | |
73 | return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0); | |
74 | } | |
75 | ||
76 | /* | |
77 | * Special values for xfs_bmbt_irec_t br_startblock field. | |
78 | */ | |
79 | #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) | |
80 | #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) | |
81 | ||
82 | #define XFS_BMAP_INIT(flp,fbp) xfs_bmap_init(flp,fbp) | |
83 | static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp) | |
84 | { | |
85 | ((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \ | |
86 | (flp)->xbf_low = 0, *(fbp) = NULLFSBLOCK); | |
87 | } | |
88 | ||
89 | /* | |
90 | * Argument structure for xfs_bmap_alloc. | |
91 | */ | |
92 | typedef struct xfs_bmalloca { | |
93 | xfs_fsblock_t firstblock; /* i/o first block allocated */ | |
94 | xfs_fsblock_t rval; /* starting block of new extent */ | |
95 | xfs_fileoff_t off; /* offset in file filling in */ | |
96 | struct xfs_trans *tp; /* transaction pointer */ | |
97 | struct xfs_inode *ip; /* incore inode pointer */ | |
98 | struct xfs_bmbt_irec *prevp; /* extent before the new one */ | |
99 | struct xfs_bmbt_irec *gotp; /* extent after, or delayed */ | |
100 | xfs_extlen_t alen; /* i/o length asked/allocated */ | |
101 | xfs_extlen_t total; /* total blocks needed for xaction */ | |
102 | xfs_extlen_t minlen; /* mininum allocation size (blocks) */ | |
103 | xfs_extlen_t minleft; /* amount must be left after alloc */ | |
104 | char eof; /* set if allocating past last extent */ | |
105 | char wasdel; /* replacing a delayed allocation */ | |
106 | char userdata;/* set if is user data */ | |
107 | char low; /* low on space, using seq'l ags */ | |
108 | char aeof; /* allocated space at eof */ | |
109 | char conv; /* overwriting unwritten extents */ | |
110 | } xfs_bmalloca_t; | |
111 | ||
112 | #ifdef __KERNEL__ | |
113 | ||
114 | #if defined(XFS_BMAP_TRACE) | |
115 | /* | |
116 | * Trace operations for bmap extent tracing | |
117 | */ | |
118 | #define XFS_BMAP_KTRACE_DELETE 1 | |
119 | #define XFS_BMAP_KTRACE_INSERT 2 | |
120 | #define XFS_BMAP_KTRACE_PRE_UP 3 | |
121 | #define XFS_BMAP_KTRACE_POST_UP 4 | |
122 | ||
123 | #define XFS_BMAP_TRACE_SIZE 4096 /* size of global trace buffer */ | |
124 | #define XFS_BMAP_KTRACE_SIZE 32 /* size of per-inode trace buffer */ | |
125 | extern ktrace_t *xfs_bmap_trace_buf; | |
126 | ||
127 | /* | |
128 | * Add bmap trace insert entries for all the contents of the extent list. | |
129 | */ | |
130 | void | |
131 | xfs_bmap_trace_exlist( | |
132 | char *fname, /* function name */ | |
133 | struct xfs_inode *ip, /* incore inode pointer */ | |
134 | xfs_extnum_t cnt, /* count of entries in list */ | |
135 | int whichfork); /* data or attr fork */ | |
136 | #else | |
137 | #define xfs_bmap_trace_exlist(f,ip,c,w) | |
138 | #endif | |
139 | ||
140 | /* | |
141 | * Convert inode from non-attributed to attributed. | |
142 | * Must not be in a transaction, ip must not be locked. | |
143 | */ | |
144 | int /* error code */ | |
145 | xfs_bmap_add_attrfork( | |
146 | struct xfs_inode *ip, /* incore inode pointer */ | |
147 | int size, /* space needed for new attribute */ | |
148 | int rsvd); /* flag for reserved block allocation */ | |
149 | ||
150 | /* | |
151 | * Add the extent to the list of extents to be free at transaction end. | |
152 | * The list is maintained sorted (by block number). | |
153 | */ | |
154 | void | |
155 | xfs_bmap_add_free( | |
156 | xfs_fsblock_t bno, /* fs block number of extent */ | |
157 | xfs_filblks_t len, /* length of extent */ | |
158 | xfs_bmap_free_t *flist, /* list of extents */ | |
159 | struct xfs_mount *mp); /* mount point structure */ | |
160 | ||
161 | /* | |
162 | * Routine to clean up the free list data structure when | |
163 | * an error occurs during a transaction. | |
164 | */ | |
165 | void | |
166 | xfs_bmap_cancel( | |
167 | xfs_bmap_free_t *flist); /* free list to clean up */ | |
168 | ||
169 | /* | |
170 | * Compute and fill in the value of the maximum depth of a bmap btree | |
171 | * in this filesystem. Done once, during mount. | |
172 | */ | |
173 | void | |
174 | xfs_bmap_compute_maxlevels( | |
175 | struct xfs_mount *mp, /* file system mount structure */ | |
176 | int whichfork); /* data or attr fork */ | |
177 | ||
178 | /* | |
179 | * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi | |
180 | * caller. Frees all the extents that need freeing, which must be done | |
181 | * last due to locking considerations. | |
182 | * | |
183 | * Return 1 if the given transaction was committed and a new one allocated, | |
184 | * and 0 otherwise. | |
185 | */ | |
186 | int /* error */ | |
187 | xfs_bmap_finish( | |
188 | struct xfs_trans **tp, /* transaction pointer addr */ | |
189 | xfs_bmap_free_t *flist, /* i/o: list extents to free */ | |
190 | xfs_fsblock_t firstblock, /* controlled a.g. for allocs */ | |
191 | int *committed); /* xact committed or not */ | |
192 | ||
193 | /* | |
194 | * Returns the file-relative block number of the first unused block in the file. | |
195 | * This is the lowest-address hole if the file has holes, else the first block | |
196 | * past the end of file. | |
197 | */ | |
198 | int /* error */ | |
199 | xfs_bmap_first_unused( | |
200 | struct xfs_trans *tp, /* transaction pointer */ | |
201 | struct xfs_inode *ip, /* incore inode */ | |
202 | xfs_extlen_t len, /* size of hole to find */ | |
203 | xfs_fileoff_t *unused, /* unused block num */ | |
204 | int whichfork); /* data or attr fork */ | |
205 | ||
206 | /* | |
207 | * Returns the file-relative block number of the last block + 1 before | |
208 | * last_block (input value) in the file. | |
209 | * This is not based on i_size, it is based on the extent list. | |
210 | * Returns 0 for local files, as they do not have an extent list. | |
211 | */ | |
212 | int /* error */ | |
213 | xfs_bmap_last_before( | |
214 | struct xfs_trans *tp, /* transaction pointer */ | |
215 | struct xfs_inode *ip, /* incore inode */ | |
216 | xfs_fileoff_t *last_block, /* last block */ | |
217 | int whichfork); /* data or attr fork */ | |
218 | ||
219 | /* | |
220 | * Returns the file-relative block number of the first block past eof in | |
221 | * the file. This is not based on i_size, it is based on the extent list. | |
222 | * Returns 0 for local files, as they do not have an extent list. | |
223 | */ | |
224 | int /* error */ | |
225 | xfs_bmap_last_offset( | |
226 | struct xfs_trans *tp, /* transaction pointer */ | |
227 | struct xfs_inode *ip, /* incore inode */ | |
228 | xfs_fileoff_t *unused, /* last block num */ | |
229 | int whichfork); /* data or attr fork */ | |
230 | ||
231 | /* | |
232 | * Returns whether the selected fork of the inode has exactly one | |
233 | * block or not. For the data fork we check this matches di_size, | |
234 | * implying the file's range is 0..bsize-1. | |
235 | */ | |
236 | int | |
237 | xfs_bmap_one_block( | |
238 | struct xfs_inode *ip, /* incore inode */ | |
239 | int whichfork); /* data or attr fork */ | |
240 | ||
241 | /* | |
242 | * Read in the extents to iu_extents. | |
243 | * All inode fields are set up by caller, we just traverse the btree | |
244 | * and copy the records in. | |
245 | */ | |
246 | int /* error */ | |
247 | xfs_bmap_read_extents( | |
248 | struct xfs_trans *tp, /* transaction pointer */ | |
249 | struct xfs_inode *ip, /* incore inode */ | |
250 | int whichfork); /* data or attr fork */ | |
251 | ||
252 | /* | |
253 | * Map file blocks to filesystem blocks. | |
254 | * File range is given by the bno/len pair. | |
255 | * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set) | |
256 | * into a hole or past eof. | |
257 | * Only allocates blocks from a single allocation group, | |
258 | * to avoid locking problems. | |
259 | * The returned value in "firstblock" from the first call in a transaction | |
260 | * must be remembered and presented to subsequent calls in "firstblock". | |
261 | * An upper bound for the number of blocks to be allocated is supplied to | |
262 | * the first call in "total"; if no allocation group has that many free | |
263 | * blocks then the call will fail (return NULLFSBLOCK in "firstblock"). | |
264 | */ | |
265 | int /* error */ | |
266 | xfs_bmapi( | |
267 | struct xfs_trans *tp, /* transaction pointer */ | |
268 | struct xfs_inode *ip, /* incore inode */ | |
269 | xfs_fileoff_t bno, /* starting file offs. mapped */ | |
270 | xfs_filblks_t len, /* length to map in file */ | |
271 | int flags, /* XFS_BMAPI_... */ | |
272 | xfs_fsblock_t *firstblock, /* first allocated block | |
273 | controls a.g. for allocs */ | |
274 | xfs_extlen_t total, /* total blocks needed */ | |
275 | struct xfs_bmbt_irec *mval, /* output: map values */ | |
276 | int *nmap, /* i/o: mval size/count */ | |
277 | xfs_bmap_free_t *flist); /* i/o: list extents to free */ | |
278 | ||
279 | /* | |
280 | * Map file blocks to filesystem blocks, simple version. | |
281 | * One block only, read-only. | |
282 | * For flags, only the XFS_BMAPI_ATTRFORK flag is examined. | |
283 | * For the other flag values, the effect is as if XFS_BMAPI_METADATA | |
284 | * was set and all the others were clear. | |
285 | */ | |
286 | int /* error */ | |
287 | xfs_bmapi_single( | |
288 | struct xfs_trans *tp, /* transaction pointer */ | |
289 | struct xfs_inode *ip, /* incore inode */ | |
290 | int whichfork, /* data or attr fork */ | |
291 | xfs_fsblock_t *fsb, /* output: mapped block */ | |
292 | xfs_fileoff_t bno); /* starting file offs. mapped */ | |
293 | ||
294 | /* | |
295 | * Unmap (remove) blocks from a file. | |
296 | * If nexts is nonzero then the number of extents to remove is limited to | |
297 | * that value. If not all extents in the block range can be removed then | |
298 | * *done is set. | |
299 | */ | |
300 | int /* error */ | |
301 | xfs_bunmapi( | |
302 | struct xfs_trans *tp, /* transaction pointer */ | |
303 | struct xfs_inode *ip, /* incore inode */ | |
304 | xfs_fileoff_t bno, /* starting offset to unmap */ | |
305 | xfs_filblks_t len, /* length to unmap in file */ | |
306 | int flags, /* XFS_BMAPI_... */ | |
307 | xfs_extnum_t nexts, /* number of extents max */ | |
308 | xfs_fsblock_t *firstblock, /* first allocated block | |
309 | controls a.g. for allocs */ | |
310 | xfs_bmap_free_t *flist, /* i/o: list extents to free */ | |
311 | int *done); /* set if not done yet */ | |
312 | ||
313 | /* | |
314 | * Fcntl interface to xfs_bmapi. | |
315 | */ | |
316 | int /* error code */ | |
317 | xfs_getbmap( | |
318 | bhv_desc_t *bdp, /* XFS behavior descriptor*/ | |
319 | struct getbmap *bmv, /* user bmap structure */ | |
320 | void __user *ap, /* pointer to user's array */ | |
321 | int iflags); /* interface flags */ | |
322 | ||
323 | /* | |
324 | * Check if the endoff is outside the last extent. If so the caller will grow | |
325 | * the allocation to a stripe unit boundary | |
326 | */ | |
327 | int | |
328 | xfs_bmap_eof( | |
329 | struct xfs_inode *ip, | |
330 | xfs_fileoff_t endoff, | |
331 | int whichfork, | |
332 | int *eof); | |
333 | ||
334 | /* | |
335 | * Count fsblocks of the given fork. | |
336 | */ | |
337 | int | |
338 | xfs_bmap_count_blocks( | |
339 | xfs_trans_t *tp, | |
340 | struct xfs_inode *ip, | |
341 | int whichfork, | |
342 | int *count); | |
343 | ||
344 | /* | |
345 | * Check an extent list, which has just been read, for | |
346 | * any bit in the extent flag field. | |
347 | */ | |
348 | int | |
349 | xfs_check_nostate_extents( | |
350 | xfs_bmbt_rec_t *ep, | |
351 | xfs_extnum_t num); | |
352 | ||
353 | #endif /* __KERNEL__ */ | |
354 | ||
355 | #endif /* __XFS_BMAP_H__ */ |