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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
1da177e4 | 32 | #include "xfs.h" |
a844f451 | 33 | #include "xfs_fs.h" |
1da177e4 | 34 | #include "xfs_types.h" |
a844f451 | 35 | #include "xfs_bit.h" |
1da177e4 | 36 | #include "xfs_log.h" |
a844f451 | 37 | #include "xfs_inum.h" |
1da177e4 LT |
38 | #include "xfs_trans.h" |
39 | #include "xfs_sb.h" | |
40 | #include "xfs_ag.h" | |
41 | #include "xfs_dir.h" | |
a844f451 | 42 | #include "xfs_dir2.h" |
1da177e4 LT |
43 | #include "xfs_dmapi.h" |
44 | #include "xfs_mount.h" | |
1da177e4 | 45 | #include "xfs_bmap_btree.h" |
a844f451 | 46 | #include "xfs_alloc_btree.h" |
1da177e4 | 47 | #include "xfs_ialloc_btree.h" |
a844f451 NS |
48 | #include "xfs_dir_sf.h" |
49 | #include "xfs_dir2_sf.h" | |
50 | #include "xfs_attr_sf.h" | |
51 | #include "xfs_dinode.h" | |
52 | #include "xfs_inode.h" | |
1da177e4 LT |
53 | #include "xfs_btree.h" |
54 | #include "xfs_ialloc.h" | |
55 | #include "xfs_alloc.h" | |
1da177e4 LT |
56 | #include "xfs_error.h" |
57 | ||
58 | ||
59 | #define XFS_ABSDIFF(a,b) (((a) <= (b)) ? ((b) - (a)) : ((a) - (b))) | |
60 | ||
61 | #define XFSA_FIXUP_BNO_OK 1 | |
62 | #define XFSA_FIXUP_CNT_OK 2 | |
63 | ||
ba0f32d4 | 64 | STATIC int |
1da177e4 LT |
65 | xfs_alloc_search_busy(xfs_trans_t *tp, |
66 | xfs_agnumber_t agno, | |
67 | xfs_agblock_t bno, | |
68 | xfs_extlen_t len); | |
69 | ||
70 | #if defined(XFS_ALLOC_TRACE) | |
71 | ktrace_t *xfs_alloc_trace_buf; | |
72 | ||
73 | #define TRACE_ALLOC(s,a) \ | |
74 | xfs_alloc_trace_alloc(fname, s, a, __LINE__) | |
75 | #define TRACE_FREE(s,a,b,x,f) \ | |
76 | xfs_alloc_trace_free(fname, s, mp, a, b, x, f, __LINE__) | |
77 | #define TRACE_MODAGF(s,a,f) \ | |
78 | xfs_alloc_trace_modagf(fname, s, mp, a, f, __LINE__) | |
79 | #define TRACE_BUSY(fname,s,ag,agb,l,sl,tp) \ | |
80 | xfs_alloc_trace_busy(fname, s, mp, ag, agb, l, sl, tp, XFS_ALLOC_KTRACE_BUSY, __LINE__) | |
81 | #define TRACE_UNBUSY(fname,s,ag,sl,tp) \ | |
82 | xfs_alloc_trace_busy(fname, s, mp, ag, -1, -1, sl, tp, XFS_ALLOC_KTRACE_UNBUSY, __LINE__) | |
83 | #define TRACE_BUSYSEARCH(fname,s,ag,agb,l,sl,tp) \ | |
84 | xfs_alloc_trace_busy(fname, s, mp, ag, agb, l, sl, tp, XFS_ALLOC_KTRACE_BUSYSEARCH, __LINE__) | |
85 | #else | |
86 | #define TRACE_ALLOC(s,a) | |
87 | #define TRACE_FREE(s,a,b,x,f) | |
88 | #define TRACE_MODAGF(s,a,f) | |
89 | #define TRACE_BUSY(s,a,ag,agb,l,sl,tp) | |
90 | #define TRACE_UNBUSY(fname,s,ag,sl,tp) | |
91 | #define TRACE_BUSYSEARCH(fname,s,ag,agb,l,sl,tp) | |
92 | #endif /* XFS_ALLOC_TRACE */ | |
93 | ||
94 | /* | |
95 | * Prototypes for per-ag allocation routines | |
96 | */ | |
97 | ||
98 | STATIC int xfs_alloc_ag_vextent_exact(xfs_alloc_arg_t *); | |
99 | STATIC int xfs_alloc_ag_vextent_near(xfs_alloc_arg_t *); | |
100 | STATIC int xfs_alloc_ag_vextent_size(xfs_alloc_arg_t *); | |
101 | STATIC int xfs_alloc_ag_vextent_small(xfs_alloc_arg_t *, | |
102 | xfs_btree_cur_t *, xfs_agblock_t *, xfs_extlen_t *, int *); | |
103 | ||
104 | /* | |
105 | * Internal functions. | |
106 | */ | |
107 | ||
108 | /* | |
109 | * Compute aligned version of the found extent. | |
110 | * Takes alignment and min length into account. | |
111 | */ | |
112 | STATIC int /* success (>= minlen) */ | |
113 | xfs_alloc_compute_aligned( | |
114 | xfs_agblock_t foundbno, /* starting block in found extent */ | |
115 | xfs_extlen_t foundlen, /* length in found extent */ | |
116 | xfs_extlen_t alignment, /* alignment for allocation */ | |
117 | xfs_extlen_t minlen, /* minimum length for allocation */ | |
118 | xfs_agblock_t *resbno, /* result block number */ | |
119 | xfs_extlen_t *reslen) /* result length */ | |
120 | { | |
121 | xfs_agblock_t bno; | |
122 | xfs_extlen_t diff; | |
123 | xfs_extlen_t len; | |
124 | ||
125 | if (alignment > 1 && foundlen >= minlen) { | |
126 | bno = roundup(foundbno, alignment); | |
127 | diff = bno - foundbno; | |
128 | len = diff >= foundlen ? 0 : foundlen - diff; | |
129 | } else { | |
130 | bno = foundbno; | |
131 | len = foundlen; | |
132 | } | |
133 | *resbno = bno; | |
134 | *reslen = len; | |
135 | return len >= minlen; | |
136 | } | |
137 | ||
138 | /* | |
139 | * Compute best start block and diff for "near" allocations. | |
140 | * freelen >= wantlen already checked by caller. | |
141 | */ | |
142 | STATIC xfs_extlen_t /* difference value (absolute) */ | |
143 | xfs_alloc_compute_diff( | |
144 | xfs_agblock_t wantbno, /* target starting block */ | |
145 | xfs_extlen_t wantlen, /* target length */ | |
146 | xfs_extlen_t alignment, /* target alignment */ | |
147 | xfs_agblock_t freebno, /* freespace's starting block */ | |
148 | xfs_extlen_t freelen, /* freespace's length */ | |
149 | xfs_agblock_t *newbnop) /* result: best start block from free */ | |
150 | { | |
151 | xfs_agblock_t freeend; /* end of freespace extent */ | |
152 | xfs_agblock_t newbno1; /* return block number */ | |
153 | xfs_agblock_t newbno2; /* other new block number */ | |
154 | xfs_extlen_t newlen1=0; /* length with newbno1 */ | |
155 | xfs_extlen_t newlen2=0; /* length with newbno2 */ | |
156 | xfs_agblock_t wantend; /* end of target extent */ | |
157 | ||
158 | ASSERT(freelen >= wantlen); | |
159 | freeend = freebno + freelen; | |
160 | wantend = wantbno + wantlen; | |
161 | if (freebno >= wantbno) { | |
162 | if ((newbno1 = roundup(freebno, alignment)) >= freeend) | |
163 | newbno1 = NULLAGBLOCK; | |
164 | } else if (freeend >= wantend && alignment > 1) { | |
165 | newbno1 = roundup(wantbno, alignment); | |
166 | newbno2 = newbno1 - alignment; | |
167 | if (newbno1 >= freeend) | |
168 | newbno1 = NULLAGBLOCK; | |
169 | else | |
170 | newlen1 = XFS_EXTLEN_MIN(wantlen, freeend - newbno1); | |
171 | if (newbno2 < freebno) | |
172 | newbno2 = NULLAGBLOCK; | |
173 | else | |
174 | newlen2 = XFS_EXTLEN_MIN(wantlen, freeend - newbno2); | |
175 | if (newbno1 != NULLAGBLOCK && newbno2 != NULLAGBLOCK) { | |
176 | if (newlen1 < newlen2 || | |
177 | (newlen1 == newlen2 && | |
178 | XFS_ABSDIFF(newbno1, wantbno) > | |
179 | XFS_ABSDIFF(newbno2, wantbno))) | |
180 | newbno1 = newbno2; | |
181 | } else if (newbno2 != NULLAGBLOCK) | |
182 | newbno1 = newbno2; | |
183 | } else if (freeend >= wantend) { | |
184 | newbno1 = wantbno; | |
185 | } else if (alignment > 1) { | |
186 | newbno1 = roundup(freeend - wantlen, alignment); | |
187 | if (newbno1 > freeend - wantlen && | |
188 | newbno1 - alignment >= freebno) | |
189 | newbno1 -= alignment; | |
190 | else if (newbno1 >= freeend) | |
191 | newbno1 = NULLAGBLOCK; | |
192 | } else | |
193 | newbno1 = freeend - wantlen; | |
194 | *newbnop = newbno1; | |
195 | return newbno1 == NULLAGBLOCK ? 0 : XFS_ABSDIFF(newbno1, wantbno); | |
196 | } | |
197 | ||
198 | /* | |
199 | * Fix up the length, based on mod and prod. | |
200 | * len should be k * prod + mod for some k. | |
201 | * If len is too small it is returned unchanged. | |
202 | * If len hits maxlen it is left alone. | |
203 | */ | |
204 | STATIC void | |
205 | xfs_alloc_fix_len( | |
206 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
207 | { | |
208 | xfs_extlen_t k; | |
209 | xfs_extlen_t rlen; | |
210 | ||
211 | ASSERT(args->mod < args->prod); | |
212 | rlen = args->len; | |
213 | ASSERT(rlen >= args->minlen); | |
214 | ASSERT(rlen <= args->maxlen); | |
215 | if (args->prod <= 1 || rlen < args->mod || rlen == args->maxlen || | |
216 | (args->mod == 0 && rlen < args->prod)) | |
217 | return; | |
218 | k = rlen % args->prod; | |
219 | if (k == args->mod) | |
220 | return; | |
221 | if (k > args->mod) { | |
222 | if ((int)(rlen = rlen - k - args->mod) < (int)args->minlen) | |
223 | return; | |
224 | } else { | |
225 | if ((int)(rlen = rlen - args->prod - (args->mod - k)) < | |
226 | (int)args->minlen) | |
227 | return; | |
228 | } | |
229 | ASSERT(rlen >= args->minlen); | |
230 | ASSERT(rlen <= args->maxlen); | |
231 | args->len = rlen; | |
232 | } | |
233 | ||
234 | /* | |
235 | * Fix up length if there is too little space left in the a.g. | |
236 | * Return 1 if ok, 0 if too little, should give up. | |
237 | */ | |
238 | STATIC int | |
239 | xfs_alloc_fix_minleft( | |
240 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
241 | { | |
242 | xfs_agf_t *agf; /* a.g. freelist header */ | |
243 | int diff; /* free space difference */ | |
244 | ||
245 | if (args->minleft == 0) | |
246 | return 1; | |
247 | agf = XFS_BUF_TO_AGF(args->agbp); | |
248 | diff = INT_GET(agf->agf_freeblks, ARCH_CONVERT) | |
249 | + INT_GET(agf->agf_flcount, ARCH_CONVERT) | |
250 | - args->len - args->minleft; | |
251 | if (diff >= 0) | |
252 | return 1; | |
253 | args->len += diff; /* shrink the allocated space */ | |
254 | if (args->len >= args->minlen) | |
255 | return 1; | |
256 | args->agbno = NULLAGBLOCK; | |
257 | return 0; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Update the two btrees, logically removing from freespace the extent | |
262 | * starting at rbno, rlen blocks. The extent is contained within the | |
263 | * actual (current) free extent fbno for flen blocks. | |
264 | * Flags are passed in indicating whether the cursors are set to the | |
265 | * relevant records. | |
266 | */ | |
267 | STATIC int /* error code */ | |
268 | xfs_alloc_fixup_trees( | |
269 | xfs_btree_cur_t *cnt_cur, /* cursor for by-size btree */ | |
270 | xfs_btree_cur_t *bno_cur, /* cursor for by-block btree */ | |
271 | xfs_agblock_t fbno, /* starting block of free extent */ | |
272 | xfs_extlen_t flen, /* length of free extent */ | |
273 | xfs_agblock_t rbno, /* starting block of returned extent */ | |
274 | xfs_extlen_t rlen, /* length of returned extent */ | |
275 | int flags) /* flags, XFSA_FIXUP_... */ | |
276 | { | |
277 | int error; /* error code */ | |
278 | int i; /* operation results */ | |
279 | xfs_agblock_t nfbno1; /* first new free startblock */ | |
280 | xfs_agblock_t nfbno2; /* second new free startblock */ | |
281 | xfs_extlen_t nflen1=0; /* first new free length */ | |
282 | xfs_extlen_t nflen2=0; /* second new free length */ | |
283 | ||
284 | /* | |
285 | * Look up the record in the by-size tree if necessary. | |
286 | */ | |
287 | if (flags & XFSA_FIXUP_CNT_OK) { | |
288 | #ifdef DEBUG | |
289 | if ((error = xfs_alloc_get_rec(cnt_cur, &nfbno1, &nflen1, &i))) | |
290 | return error; | |
291 | XFS_WANT_CORRUPTED_RETURN( | |
292 | i == 1 && nfbno1 == fbno && nflen1 == flen); | |
293 | #endif | |
294 | } else { | |
295 | if ((error = xfs_alloc_lookup_eq(cnt_cur, fbno, flen, &i))) | |
296 | return error; | |
297 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
298 | } | |
299 | /* | |
300 | * Look up the record in the by-block tree if necessary. | |
301 | */ | |
302 | if (flags & XFSA_FIXUP_BNO_OK) { | |
303 | #ifdef DEBUG | |
304 | if ((error = xfs_alloc_get_rec(bno_cur, &nfbno1, &nflen1, &i))) | |
305 | return error; | |
306 | XFS_WANT_CORRUPTED_RETURN( | |
307 | i == 1 && nfbno1 == fbno && nflen1 == flen); | |
308 | #endif | |
309 | } else { | |
310 | if ((error = xfs_alloc_lookup_eq(bno_cur, fbno, flen, &i))) | |
311 | return error; | |
312 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
313 | } | |
314 | #ifdef DEBUG | |
315 | { | |
316 | xfs_alloc_block_t *bnoblock; | |
317 | xfs_alloc_block_t *cntblock; | |
318 | ||
319 | if (bno_cur->bc_nlevels == 1 && | |
320 | cnt_cur->bc_nlevels == 1) { | |
321 | bnoblock = XFS_BUF_TO_ALLOC_BLOCK(bno_cur->bc_bufs[0]); | |
322 | cntblock = XFS_BUF_TO_ALLOC_BLOCK(cnt_cur->bc_bufs[0]); | |
323 | XFS_WANT_CORRUPTED_RETURN( | |
324 | INT_GET(bnoblock->bb_numrecs, ARCH_CONVERT) == INT_GET(cntblock->bb_numrecs, ARCH_CONVERT)); | |
325 | } | |
326 | } | |
327 | #endif | |
328 | /* | |
329 | * Deal with all four cases: the allocated record is contained | |
330 | * within the freespace record, so we can have new freespace | |
331 | * at either (or both) end, or no freespace remaining. | |
332 | */ | |
333 | if (rbno == fbno && rlen == flen) | |
334 | nfbno1 = nfbno2 = NULLAGBLOCK; | |
335 | else if (rbno == fbno) { | |
336 | nfbno1 = rbno + rlen; | |
337 | nflen1 = flen - rlen; | |
338 | nfbno2 = NULLAGBLOCK; | |
339 | } else if (rbno + rlen == fbno + flen) { | |
340 | nfbno1 = fbno; | |
341 | nflen1 = flen - rlen; | |
342 | nfbno2 = NULLAGBLOCK; | |
343 | } else { | |
344 | nfbno1 = fbno; | |
345 | nflen1 = rbno - fbno; | |
346 | nfbno2 = rbno + rlen; | |
347 | nflen2 = (fbno + flen) - nfbno2; | |
348 | } | |
349 | /* | |
350 | * Delete the entry from the by-size btree. | |
351 | */ | |
352 | if ((error = xfs_alloc_delete(cnt_cur, &i))) | |
353 | return error; | |
354 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
355 | /* | |
356 | * Add new by-size btree entry(s). | |
357 | */ | |
358 | if (nfbno1 != NULLAGBLOCK) { | |
359 | if ((error = xfs_alloc_lookup_eq(cnt_cur, nfbno1, nflen1, &i))) | |
360 | return error; | |
361 | XFS_WANT_CORRUPTED_RETURN(i == 0); | |
362 | if ((error = xfs_alloc_insert(cnt_cur, &i))) | |
363 | return error; | |
364 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
365 | } | |
366 | if (nfbno2 != NULLAGBLOCK) { | |
367 | if ((error = xfs_alloc_lookup_eq(cnt_cur, nfbno2, nflen2, &i))) | |
368 | return error; | |
369 | XFS_WANT_CORRUPTED_RETURN(i == 0); | |
370 | if ((error = xfs_alloc_insert(cnt_cur, &i))) | |
371 | return error; | |
372 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
373 | } | |
374 | /* | |
375 | * Fix up the by-block btree entry(s). | |
376 | */ | |
377 | if (nfbno1 == NULLAGBLOCK) { | |
378 | /* | |
379 | * No remaining freespace, just delete the by-block tree entry. | |
380 | */ | |
381 | if ((error = xfs_alloc_delete(bno_cur, &i))) | |
382 | return error; | |
383 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
384 | } else { | |
385 | /* | |
386 | * Update the by-block entry to start later|be shorter. | |
387 | */ | |
388 | if ((error = xfs_alloc_update(bno_cur, nfbno1, nflen1))) | |
389 | return error; | |
390 | } | |
391 | if (nfbno2 != NULLAGBLOCK) { | |
392 | /* | |
393 | * 2 resulting free entries, need to add one. | |
394 | */ | |
395 | if ((error = xfs_alloc_lookup_eq(bno_cur, nfbno2, nflen2, &i))) | |
396 | return error; | |
397 | XFS_WANT_CORRUPTED_RETURN(i == 0); | |
398 | if ((error = xfs_alloc_insert(bno_cur, &i))) | |
399 | return error; | |
400 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
401 | } | |
402 | return 0; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Read in the allocation group free block array. | |
407 | */ | |
408 | STATIC int /* error */ | |
409 | xfs_alloc_read_agfl( | |
410 | xfs_mount_t *mp, /* mount point structure */ | |
411 | xfs_trans_t *tp, /* transaction pointer */ | |
412 | xfs_agnumber_t agno, /* allocation group number */ | |
413 | xfs_buf_t **bpp) /* buffer for the ag free block array */ | |
414 | { | |
415 | xfs_buf_t *bp; /* return value */ | |
416 | int error; | |
417 | ||
418 | ASSERT(agno != NULLAGNUMBER); | |
419 | error = xfs_trans_read_buf( | |
420 | mp, tp, mp->m_ddev_targp, | |
421 | XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)), | |
422 | XFS_FSS_TO_BB(mp, 1), 0, &bp); | |
423 | if (error) | |
424 | return error; | |
425 | ASSERT(bp); | |
426 | ASSERT(!XFS_BUF_GETERROR(bp)); | |
427 | XFS_BUF_SET_VTYPE_REF(bp, B_FS_AGFL, XFS_AGFL_REF); | |
428 | *bpp = bp; | |
429 | return 0; | |
430 | } | |
431 | ||
432 | #if defined(XFS_ALLOC_TRACE) | |
433 | /* | |
434 | * Add an allocation trace entry for an alloc call. | |
435 | */ | |
436 | STATIC void | |
437 | xfs_alloc_trace_alloc( | |
438 | char *name, /* function tag string */ | |
439 | char *str, /* additional string */ | |
440 | xfs_alloc_arg_t *args, /* allocation argument structure */ | |
441 | int line) /* source line number */ | |
442 | { | |
443 | ktrace_enter(xfs_alloc_trace_buf, | |
444 | (void *)(__psint_t)(XFS_ALLOC_KTRACE_ALLOC | (line << 16)), | |
445 | (void *)name, | |
446 | (void *)str, | |
447 | (void *)args->mp, | |
448 | (void *)(__psunsigned_t)args->agno, | |
449 | (void *)(__psunsigned_t)args->agbno, | |
450 | (void *)(__psunsigned_t)args->minlen, | |
451 | (void *)(__psunsigned_t)args->maxlen, | |
452 | (void *)(__psunsigned_t)args->mod, | |
453 | (void *)(__psunsigned_t)args->prod, | |
454 | (void *)(__psunsigned_t)args->minleft, | |
455 | (void *)(__psunsigned_t)args->total, | |
456 | (void *)(__psunsigned_t)args->alignment, | |
457 | (void *)(__psunsigned_t)args->len, | |
458 | (void *)((((__psint_t)args->type) << 16) | | |
459 | (__psint_t)args->otype), | |
460 | (void *)(__psint_t)((args->wasdel << 3) | | |
461 | (args->wasfromfl << 2) | | |
462 | (args->isfl << 1) | | |
463 | (args->userdata << 0))); | |
464 | } | |
465 | ||
466 | /* | |
467 | * Add an allocation trace entry for a free call. | |
468 | */ | |
469 | STATIC void | |
470 | xfs_alloc_trace_free( | |
471 | char *name, /* function tag string */ | |
472 | char *str, /* additional string */ | |
473 | xfs_mount_t *mp, /* file system mount point */ | |
474 | xfs_agnumber_t agno, /* allocation group number */ | |
475 | xfs_agblock_t agbno, /* a.g. relative block number */ | |
476 | xfs_extlen_t len, /* length of extent */ | |
477 | int isfl, /* set if is freelist allocation/free */ | |
478 | int line) /* source line number */ | |
479 | { | |
480 | ktrace_enter(xfs_alloc_trace_buf, | |
481 | (void *)(__psint_t)(XFS_ALLOC_KTRACE_FREE | (line << 16)), | |
482 | (void *)name, | |
483 | (void *)str, | |
484 | (void *)mp, | |
485 | (void *)(__psunsigned_t)agno, | |
486 | (void *)(__psunsigned_t)agbno, | |
487 | (void *)(__psunsigned_t)len, | |
488 | (void *)(__psint_t)isfl, | |
489 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL); | |
490 | } | |
491 | ||
492 | /* | |
493 | * Add an allocation trace entry for modifying an agf. | |
494 | */ | |
495 | STATIC void | |
496 | xfs_alloc_trace_modagf( | |
497 | char *name, /* function tag string */ | |
498 | char *str, /* additional string */ | |
499 | xfs_mount_t *mp, /* file system mount point */ | |
500 | xfs_agf_t *agf, /* new agf value */ | |
501 | int flags, /* logging flags for agf */ | |
502 | int line) /* source line number */ | |
503 | { | |
504 | ktrace_enter(xfs_alloc_trace_buf, | |
505 | (void *)(__psint_t)(XFS_ALLOC_KTRACE_MODAGF | (line << 16)), | |
506 | (void *)name, | |
507 | (void *)str, | |
508 | (void *)mp, | |
509 | (void *)(__psint_t)flags, | |
510 | (void *)(__psunsigned_t)INT_GET(agf->agf_seqno, ARCH_CONVERT), | |
511 | (void *)(__psunsigned_t)INT_GET(agf->agf_length, ARCH_CONVERT), | |
512 | (void *)(__psunsigned_t)INT_GET(agf->agf_roots[XFS_BTNUM_BNO], | |
513 | ARCH_CONVERT), | |
514 | (void *)(__psunsigned_t)INT_GET(agf->agf_roots[XFS_BTNUM_CNT], | |
515 | ARCH_CONVERT), | |
516 | (void *)(__psunsigned_t)INT_GET(agf->agf_levels[XFS_BTNUM_BNO], | |
517 | ARCH_CONVERT), | |
518 | (void *)(__psunsigned_t)INT_GET(agf->agf_levels[XFS_BTNUM_CNT], | |
519 | ARCH_CONVERT), | |
520 | (void *)(__psunsigned_t)INT_GET(agf->agf_flfirst, ARCH_CONVERT), | |
521 | (void *)(__psunsigned_t)INT_GET(agf->agf_fllast, ARCH_CONVERT), | |
522 | (void *)(__psunsigned_t)INT_GET(agf->agf_flcount, ARCH_CONVERT), | |
523 | (void *)(__psunsigned_t)INT_GET(agf->agf_freeblks, ARCH_CONVERT), | |
524 | (void *)(__psunsigned_t)INT_GET(agf->agf_longest, ARCH_CONVERT)); | |
525 | } | |
526 | ||
527 | STATIC void | |
528 | xfs_alloc_trace_busy( | |
529 | char *name, /* function tag string */ | |
530 | char *str, /* additional string */ | |
531 | xfs_mount_t *mp, /* file system mount poing */ | |
532 | xfs_agnumber_t agno, /* allocation group number */ | |
533 | xfs_agblock_t agbno, /* a.g. relative block number */ | |
534 | xfs_extlen_t len, /* length of extent */ | |
535 | int slot, /* perag Busy slot */ | |
536 | xfs_trans_t *tp, | |
537 | int trtype, /* type: add, delete, search */ | |
538 | int line) /* source line number */ | |
539 | { | |
540 | ktrace_enter(xfs_alloc_trace_buf, | |
541 | (void *)(__psint_t)(trtype | (line << 16)), | |
542 | (void *)name, | |
543 | (void *)str, | |
544 | (void *)mp, | |
545 | (void *)(__psunsigned_t)agno, | |
546 | (void *)(__psunsigned_t)agbno, | |
547 | (void *)(__psunsigned_t)len, | |
548 | (void *)(__psint_t)slot, | |
549 | (void *)tp, | |
550 | NULL, NULL, NULL, NULL, NULL, NULL, NULL); | |
551 | } | |
552 | #endif /* XFS_ALLOC_TRACE */ | |
553 | ||
554 | /* | |
555 | * Allocation group level functions. | |
556 | */ | |
557 | ||
558 | /* | |
559 | * Allocate a variable extent in the allocation group agno. | |
560 | * Type and bno are used to determine where in the allocation group the | |
561 | * extent will start. | |
562 | * Extent's length (returned in *len) will be between minlen and maxlen, | |
563 | * and of the form k * prod + mod unless there's nothing that large. | |
564 | * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. | |
565 | */ | |
566 | STATIC int /* error */ | |
567 | xfs_alloc_ag_vextent( | |
568 | xfs_alloc_arg_t *args) /* argument structure for allocation */ | |
569 | { | |
570 | int error=0; | |
571 | #ifdef XFS_ALLOC_TRACE | |
572 | static char fname[] = "xfs_alloc_ag_vextent"; | |
573 | #endif | |
574 | ||
575 | ASSERT(args->minlen > 0); | |
576 | ASSERT(args->maxlen > 0); | |
577 | ASSERT(args->minlen <= args->maxlen); | |
578 | ASSERT(args->mod < args->prod); | |
579 | ASSERT(args->alignment > 0); | |
580 | /* | |
581 | * Branch to correct routine based on the type. | |
582 | */ | |
583 | args->wasfromfl = 0; | |
584 | switch (args->type) { | |
585 | case XFS_ALLOCTYPE_THIS_AG: | |
586 | error = xfs_alloc_ag_vextent_size(args); | |
587 | break; | |
588 | case XFS_ALLOCTYPE_NEAR_BNO: | |
589 | error = xfs_alloc_ag_vextent_near(args); | |
590 | break; | |
591 | case XFS_ALLOCTYPE_THIS_BNO: | |
592 | error = xfs_alloc_ag_vextent_exact(args); | |
593 | break; | |
594 | default: | |
595 | ASSERT(0); | |
596 | /* NOTREACHED */ | |
597 | } | |
598 | if (error) | |
599 | return error; | |
600 | /* | |
601 | * If the allocation worked, need to change the agf structure | |
602 | * (and log it), and the superblock. | |
603 | */ | |
604 | if (args->agbno != NULLAGBLOCK) { | |
605 | xfs_agf_t *agf; /* allocation group freelist header */ | |
606 | #ifdef XFS_ALLOC_TRACE | |
607 | xfs_mount_t *mp = args->mp; | |
608 | #endif | |
609 | long slen = (long)args->len; | |
610 | ||
611 | ASSERT(args->len >= args->minlen && args->len <= args->maxlen); | |
612 | ASSERT(!(args->wasfromfl) || !args->isfl); | |
613 | ASSERT(args->agbno % args->alignment == 0); | |
614 | if (!(args->wasfromfl)) { | |
615 | ||
616 | agf = XFS_BUF_TO_AGF(args->agbp); | |
617 | INT_MOD(agf->agf_freeblks, ARCH_CONVERT, -(args->len)); | |
618 | xfs_trans_agblocks_delta(args->tp, | |
619 | -((long)(args->len))); | |
620 | args->pag->pagf_freeblks -= args->len; | |
621 | ASSERT(INT_GET(agf->agf_freeblks, ARCH_CONVERT) | |
622 | <= INT_GET(agf->agf_length, ARCH_CONVERT)); | |
623 | TRACE_MODAGF(NULL, agf, XFS_AGF_FREEBLKS); | |
624 | xfs_alloc_log_agf(args->tp, args->agbp, | |
625 | XFS_AGF_FREEBLKS); | |
626 | /* search the busylist for these blocks */ | |
627 | xfs_alloc_search_busy(args->tp, args->agno, | |
628 | args->agbno, args->len); | |
629 | } | |
630 | if (!args->isfl) | |
631 | xfs_trans_mod_sb(args->tp, | |
632 | args->wasdel ? XFS_TRANS_SB_RES_FDBLOCKS : | |
633 | XFS_TRANS_SB_FDBLOCKS, -slen); | |
634 | XFS_STATS_INC(xs_allocx); | |
635 | XFS_STATS_ADD(xs_allocb, args->len); | |
636 | } | |
637 | return 0; | |
638 | } | |
639 | ||
640 | /* | |
641 | * Allocate a variable extent at exactly agno/bno. | |
642 | * Extent's length (returned in *len) will be between minlen and maxlen, | |
643 | * and of the form k * prod + mod unless there's nothing that large. | |
644 | * Return the starting a.g. block (bno), or NULLAGBLOCK if we can't do it. | |
645 | */ | |
646 | STATIC int /* error */ | |
647 | xfs_alloc_ag_vextent_exact( | |
648 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
649 | { | |
650 | xfs_btree_cur_t *bno_cur;/* by block-number btree cursor */ | |
651 | xfs_btree_cur_t *cnt_cur;/* by count btree cursor */ | |
652 | xfs_agblock_t end; /* end of allocated extent */ | |
653 | int error; | |
654 | xfs_agblock_t fbno; /* start block of found extent */ | |
655 | xfs_agblock_t fend; /* end block of found extent */ | |
656 | xfs_extlen_t flen; /* length of found extent */ | |
657 | #ifdef XFS_ALLOC_TRACE | |
658 | static char fname[] = "xfs_alloc_ag_vextent_exact"; | |
659 | #endif | |
660 | int i; /* success/failure of operation */ | |
661 | xfs_agblock_t maxend; /* end of maximal extent */ | |
662 | xfs_agblock_t minend; /* end of minimal extent */ | |
663 | xfs_extlen_t rlen; /* length of returned extent */ | |
664 | ||
665 | ASSERT(args->alignment == 1); | |
666 | /* | |
667 | * Allocate/initialize a cursor for the by-number freespace btree. | |
668 | */ | |
669 | bno_cur = xfs_btree_init_cursor(args->mp, args->tp, args->agbp, | |
670 | args->agno, XFS_BTNUM_BNO, NULL, 0); | |
671 | /* | |
672 | * Lookup bno and minlen in the btree (minlen is irrelevant, really). | |
673 | * Look for the closest free block <= bno, it must contain bno | |
674 | * if any free block does. | |
675 | */ | |
676 | if ((error = xfs_alloc_lookup_le(bno_cur, args->agbno, args->minlen, &i))) | |
677 | goto error0; | |
678 | if (!i) { | |
679 | /* | |
680 | * Didn't find it, return null. | |
681 | */ | |
682 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
683 | args->agbno = NULLAGBLOCK; | |
684 | return 0; | |
685 | } | |
686 | /* | |
687 | * Grab the freespace record. | |
688 | */ | |
689 | if ((error = xfs_alloc_get_rec(bno_cur, &fbno, &flen, &i))) | |
690 | goto error0; | |
691 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
692 | ASSERT(fbno <= args->agbno); | |
693 | minend = args->agbno + args->minlen; | |
694 | maxend = args->agbno + args->maxlen; | |
695 | fend = fbno + flen; | |
696 | /* | |
697 | * Give up if the freespace isn't long enough for the minimum request. | |
698 | */ | |
699 | if (fend < minend) { | |
700 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
701 | args->agbno = NULLAGBLOCK; | |
702 | return 0; | |
703 | } | |
704 | /* | |
705 | * End of extent will be smaller of the freespace end and the | |
706 | * maximal requested end. | |
707 | */ | |
708 | end = XFS_AGBLOCK_MIN(fend, maxend); | |
709 | /* | |
710 | * Fix the length according to mod and prod if given. | |
711 | */ | |
712 | args->len = end - args->agbno; | |
713 | xfs_alloc_fix_len(args); | |
714 | if (!xfs_alloc_fix_minleft(args)) { | |
715 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
716 | return 0; | |
717 | } | |
718 | rlen = args->len; | |
719 | ASSERT(args->agbno + rlen <= fend); | |
720 | end = args->agbno + rlen; | |
721 | /* | |
722 | * We are allocating agbno for rlen [agbno .. end] | |
723 | * Allocate/initialize a cursor for the by-size btree. | |
724 | */ | |
725 | cnt_cur = xfs_btree_init_cursor(args->mp, args->tp, args->agbp, | |
726 | args->agno, XFS_BTNUM_CNT, NULL, 0); | |
727 | ASSERT(args->agbno + args->len <= | |
728 | INT_GET(XFS_BUF_TO_AGF(args->agbp)->agf_length, | |
729 | ARCH_CONVERT)); | |
730 | if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur, fbno, flen, | |
731 | args->agbno, args->len, XFSA_FIXUP_BNO_OK))) { | |
732 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); | |
733 | goto error0; | |
734 | } | |
735 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
736 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
737 | TRACE_ALLOC("normal", args); | |
738 | args->wasfromfl = 0; | |
739 | return 0; | |
740 | ||
741 | error0: | |
742 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); | |
743 | TRACE_ALLOC("error", args); | |
744 | return error; | |
745 | } | |
746 | ||
747 | /* | |
748 | * Allocate a variable extent near bno in the allocation group agno. | |
749 | * Extent's length (returned in len) will be between minlen and maxlen, | |
750 | * and of the form k * prod + mod unless there's nothing that large. | |
751 | * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. | |
752 | */ | |
753 | STATIC int /* error */ | |
754 | xfs_alloc_ag_vextent_near( | |
755 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
756 | { | |
757 | xfs_btree_cur_t *bno_cur_gt; /* cursor for bno btree, right side */ | |
758 | xfs_btree_cur_t *bno_cur_lt; /* cursor for bno btree, left side */ | |
759 | xfs_btree_cur_t *cnt_cur; /* cursor for count btree */ | |
760 | #ifdef XFS_ALLOC_TRACE | |
761 | static char fname[] = "xfs_alloc_ag_vextent_near"; | |
762 | #endif | |
763 | xfs_agblock_t gtbno; /* start bno of right side entry */ | |
764 | xfs_agblock_t gtbnoa; /* aligned ... */ | |
765 | xfs_extlen_t gtdiff; /* difference to right side entry */ | |
766 | xfs_extlen_t gtlen; /* length of right side entry */ | |
767 | xfs_extlen_t gtlena; /* aligned ... */ | |
768 | xfs_agblock_t gtnew; /* useful start bno of right side */ | |
769 | int error; /* error code */ | |
770 | int i; /* result code, temporary */ | |
771 | int j; /* result code, temporary */ | |
772 | xfs_agblock_t ltbno; /* start bno of left side entry */ | |
773 | xfs_agblock_t ltbnoa; /* aligned ... */ | |
774 | xfs_extlen_t ltdiff; /* difference to left side entry */ | |
775 | /*REFERENCED*/ | |
776 | xfs_agblock_t ltend; /* end bno of left side entry */ | |
777 | xfs_extlen_t ltlen; /* length of left side entry */ | |
778 | xfs_extlen_t ltlena; /* aligned ... */ | |
779 | xfs_agblock_t ltnew; /* useful start bno of left side */ | |
780 | xfs_extlen_t rlen; /* length of returned extent */ | |
781 | #if defined(DEBUG) && defined(__KERNEL__) | |
782 | /* | |
783 | * Randomly don't execute the first algorithm. | |
784 | */ | |
785 | int dofirst; /* set to do first algorithm */ | |
786 | ||
787 | dofirst = random() & 1; | |
788 | #endif | |
789 | /* | |
790 | * Get a cursor for the by-size btree. | |
791 | */ | |
792 | cnt_cur = xfs_btree_init_cursor(args->mp, args->tp, args->agbp, | |
793 | args->agno, XFS_BTNUM_CNT, NULL, 0); | |
794 | ltlen = 0; | |
795 | bno_cur_lt = bno_cur_gt = NULL; | |
796 | /* | |
797 | * See if there are any free extents as big as maxlen. | |
798 | */ | |
799 | if ((error = xfs_alloc_lookup_ge(cnt_cur, 0, args->maxlen, &i))) | |
800 | goto error0; | |
801 | /* | |
802 | * If none, then pick up the last entry in the tree unless the | |
803 | * tree is empty. | |
804 | */ | |
805 | if (!i) { | |
806 | if ((error = xfs_alloc_ag_vextent_small(args, cnt_cur, <bno, | |
807 | <len, &i))) | |
808 | goto error0; | |
809 | if (i == 0 || ltlen == 0) { | |
810 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
811 | return 0; | |
812 | } | |
813 | ASSERT(i == 1); | |
814 | } | |
815 | args->wasfromfl = 0; | |
816 | /* | |
817 | * First algorithm. | |
818 | * If the requested extent is large wrt the freespaces available | |
819 | * in this a.g., then the cursor will be pointing to a btree entry | |
820 | * near the right edge of the tree. If it's in the last btree leaf | |
821 | * block, then we just examine all the entries in that block | |
822 | * that are big enough, and pick the best one. | |
823 | * This is written as a while loop so we can break out of it, | |
824 | * but we never loop back to the top. | |
825 | */ | |
826 | while (xfs_btree_islastblock(cnt_cur, 0)) { | |
827 | xfs_extlen_t bdiff; | |
828 | int besti=0; | |
829 | xfs_extlen_t blen=0; | |
830 | xfs_agblock_t bnew=0; | |
831 | ||
832 | #if defined(DEBUG) && defined(__KERNEL__) | |
833 | if (!dofirst) | |
834 | break; | |
835 | #endif | |
836 | /* | |
837 | * Start from the entry that lookup found, sequence through | |
838 | * all larger free blocks. If we're actually pointing at a | |
839 | * record smaller than maxlen, go to the start of this block, | |
840 | * and skip all those smaller than minlen. | |
841 | */ | |
842 | if (ltlen || args->alignment > 1) { | |
843 | cnt_cur->bc_ptrs[0] = 1; | |
844 | do { | |
845 | if ((error = xfs_alloc_get_rec(cnt_cur, <bno, | |
846 | <len, &i))) | |
847 | goto error0; | |
848 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
849 | if (ltlen >= args->minlen) | |
850 | break; | |
851 | if ((error = xfs_alloc_increment(cnt_cur, 0, &i))) | |
852 | goto error0; | |
853 | } while (i); | |
854 | ASSERT(ltlen >= args->minlen); | |
855 | if (!i) | |
856 | break; | |
857 | } | |
858 | i = cnt_cur->bc_ptrs[0]; | |
859 | for (j = 1, blen = 0, bdiff = 0; | |
860 | !error && j && (blen < args->maxlen || bdiff > 0); | |
861 | error = xfs_alloc_increment(cnt_cur, 0, &j)) { | |
862 | /* | |
863 | * For each entry, decide if it's better than | |
864 | * the previous best entry. | |
865 | */ | |
866 | if ((error = xfs_alloc_get_rec(cnt_cur, <bno, <len, &i))) | |
867 | goto error0; | |
868 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
869 | if (!xfs_alloc_compute_aligned(ltbno, ltlen, | |
870 | args->alignment, args->minlen, | |
871 | <bnoa, <lena)) | |
872 | continue; | |
873 | args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen); | |
874 | xfs_alloc_fix_len(args); | |
875 | ASSERT(args->len >= args->minlen); | |
876 | if (args->len < blen) | |
877 | continue; | |
878 | ltdiff = xfs_alloc_compute_diff(args->agbno, args->len, | |
879 | args->alignment, ltbno, ltlen, <new); | |
880 | if (ltnew != NULLAGBLOCK && | |
881 | (args->len > blen || ltdiff < bdiff)) { | |
882 | bdiff = ltdiff; | |
883 | bnew = ltnew; | |
884 | blen = args->len; | |
885 | besti = cnt_cur->bc_ptrs[0]; | |
886 | } | |
887 | } | |
888 | /* | |
889 | * It didn't work. We COULD be in a case where | |
890 | * there's a good record somewhere, so try again. | |
891 | */ | |
892 | if (blen == 0) | |
893 | break; | |
894 | /* | |
895 | * Point at the best entry, and retrieve it again. | |
896 | */ | |
897 | cnt_cur->bc_ptrs[0] = besti; | |
898 | if ((error = xfs_alloc_get_rec(cnt_cur, <bno, <len, &i))) | |
899 | goto error0; | |
900 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
901 | ltend = ltbno + ltlen; | |
902 | ASSERT(ltend <= INT_GET(XFS_BUF_TO_AGF(args->agbp)->agf_length, | |
903 | ARCH_CONVERT)); | |
904 | args->len = blen; | |
905 | if (!xfs_alloc_fix_minleft(args)) { | |
906 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
907 | TRACE_ALLOC("nominleft", args); | |
908 | return 0; | |
909 | } | |
910 | blen = args->len; | |
911 | /* | |
912 | * We are allocating starting at bnew for blen blocks. | |
913 | */ | |
914 | args->agbno = bnew; | |
915 | ASSERT(bnew >= ltbno); | |
916 | ASSERT(bnew + blen <= ltend); | |
917 | /* | |
918 | * Set up a cursor for the by-bno tree. | |
919 | */ | |
920 | bno_cur_lt = xfs_btree_init_cursor(args->mp, args->tp, | |
921 | args->agbp, args->agno, XFS_BTNUM_BNO, NULL, 0); | |
922 | /* | |
923 | * Fix up the btree entries. | |
924 | */ | |
925 | if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur_lt, ltbno, | |
926 | ltlen, bnew, blen, XFSA_FIXUP_CNT_OK))) | |
927 | goto error0; | |
928 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
929 | xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_NOERROR); | |
930 | TRACE_ALLOC("first", args); | |
931 | return 0; | |
932 | } | |
933 | /* | |
934 | * Second algorithm. | |
935 | * Search in the by-bno tree to the left and to the right | |
936 | * simultaneously, until in each case we find a space big enough, | |
937 | * or run into the edge of the tree. When we run into the edge, | |
938 | * we deallocate that cursor. | |
939 | * If both searches succeed, we compare the two spaces and pick | |
940 | * the better one. | |
941 | * With alignment, it's possible for both to fail; the upper | |
942 | * level algorithm that picks allocation groups for allocations | |
943 | * is not supposed to do this. | |
944 | */ | |
945 | /* | |
946 | * Allocate and initialize the cursor for the leftward search. | |
947 | */ | |
948 | bno_cur_lt = xfs_btree_init_cursor(args->mp, args->tp, args->agbp, | |
949 | args->agno, XFS_BTNUM_BNO, NULL, 0); | |
950 | /* | |
951 | * Lookup <= bno to find the leftward search's starting point. | |
952 | */ | |
953 | if ((error = xfs_alloc_lookup_le(bno_cur_lt, args->agbno, args->maxlen, &i))) | |
954 | goto error0; | |
955 | if (!i) { | |
956 | /* | |
957 | * Didn't find anything; use this cursor for the rightward | |
958 | * search. | |
959 | */ | |
960 | bno_cur_gt = bno_cur_lt; | |
961 | bno_cur_lt = NULL; | |
962 | } | |
963 | /* | |
964 | * Found something. Duplicate the cursor for the rightward search. | |
965 | */ | |
966 | else if ((error = xfs_btree_dup_cursor(bno_cur_lt, &bno_cur_gt))) | |
967 | goto error0; | |
968 | /* | |
969 | * Increment the cursor, so we will point at the entry just right | |
970 | * of the leftward entry if any, or to the leftmost entry. | |
971 | */ | |
972 | if ((error = xfs_alloc_increment(bno_cur_gt, 0, &i))) | |
973 | goto error0; | |
974 | if (!i) { | |
975 | /* | |
976 | * It failed, there are no rightward entries. | |
977 | */ | |
978 | xfs_btree_del_cursor(bno_cur_gt, XFS_BTREE_NOERROR); | |
979 | bno_cur_gt = NULL; | |
980 | } | |
981 | /* | |
982 | * Loop going left with the leftward cursor, right with the | |
983 | * rightward cursor, until either both directions give up or | |
984 | * we find an entry at least as big as minlen. | |
985 | */ | |
986 | do { | |
987 | if (bno_cur_lt) { | |
988 | if ((error = xfs_alloc_get_rec(bno_cur_lt, <bno, <len, &i))) | |
989 | goto error0; | |
990 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
991 | if (xfs_alloc_compute_aligned(ltbno, ltlen, | |
992 | args->alignment, args->minlen, | |
993 | <bnoa, <lena)) | |
994 | break; | |
995 | if ((error = xfs_alloc_decrement(bno_cur_lt, 0, &i))) | |
996 | goto error0; | |
997 | if (!i) { | |
998 | xfs_btree_del_cursor(bno_cur_lt, | |
999 | XFS_BTREE_NOERROR); | |
1000 | bno_cur_lt = NULL; | |
1001 | } | |
1002 | } | |
1003 | if (bno_cur_gt) { | |
1004 | if ((error = xfs_alloc_get_rec(bno_cur_gt, >bno, >len, &i))) | |
1005 | goto error0; | |
1006 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1007 | if (xfs_alloc_compute_aligned(gtbno, gtlen, | |
1008 | args->alignment, args->minlen, | |
1009 | >bnoa, >lena)) | |
1010 | break; | |
1011 | if ((error = xfs_alloc_increment(bno_cur_gt, 0, &i))) | |
1012 | goto error0; | |
1013 | if (!i) { | |
1014 | xfs_btree_del_cursor(bno_cur_gt, | |
1015 | XFS_BTREE_NOERROR); | |
1016 | bno_cur_gt = NULL; | |
1017 | } | |
1018 | } | |
1019 | } while (bno_cur_lt || bno_cur_gt); | |
1020 | /* | |
1021 | * Got both cursors still active, need to find better entry. | |
1022 | */ | |
1023 | if (bno_cur_lt && bno_cur_gt) { | |
1024 | /* | |
1025 | * Left side is long enough, look for a right side entry. | |
1026 | */ | |
1027 | if (ltlena >= args->minlen) { | |
1028 | /* | |
1029 | * Fix up the length. | |
1030 | */ | |
1031 | args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen); | |
1032 | xfs_alloc_fix_len(args); | |
1033 | rlen = args->len; | |
1034 | ltdiff = xfs_alloc_compute_diff(args->agbno, rlen, | |
1035 | args->alignment, ltbno, ltlen, <new); | |
1036 | /* | |
1037 | * Not perfect. | |
1038 | */ | |
1039 | if (ltdiff) { | |
1040 | /* | |
1041 | * Look until we find a better one, run out of | |
1042 | * space, or run off the end. | |
1043 | */ | |
1044 | while (bno_cur_lt && bno_cur_gt) { | |
1045 | if ((error = xfs_alloc_get_rec( | |
1046 | bno_cur_gt, >bno, | |
1047 | >len, &i))) | |
1048 | goto error0; | |
1049 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1050 | xfs_alloc_compute_aligned(gtbno, gtlen, | |
1051 | args->alignment, args->minlen, | |
1052 | >bnoa, >lena); | |
1053 | /* | |
1054 | * The left one is clearly better. | |
1055 | */ | |
1056 | if (gtbnoa >= args->agbno + ltdiff) { | |
1057 | xfs_btree_del_cursor( | |
1058 | bno_cur_gt, | |
1059 | XFS_BTREE_NOERROR); | |
1060 | bno_cur_gt = NULL; | |
1061 | break; | |
1062 | } | |
1063 | /* | |
1064 | * If we reach a big enough entry, | |
1065 | * compare the two and pick the best. | |
1066 | */ | |
1067 | if (gtlena >= args->minlen) { | |
1068 | args->len = | |
1069 | XFS_EXTLEN_MIN(gtlena, | |
1070 | args->maxlen); | |
1071 | xfs_alloc_fix_len(args); | |
1072 | rlen = args->len; | |
1073 | gtdiff = xfs_alloc_compute_diff( | |
1074 | args->agbno, rlen, | |
1075 | args->alignment, | |
1076 | gtbno, gtlen, >new); | |
1077 | /* | |
1078 | * Right side is better. | |
1079 | */ | |
1080 | if (gtdiff < ltdiff) { | |
1081 | xfs_btree_del_cursor( | |
1082 | bno_cur_lt, | |
1083 | XFS_BTREE_NOERROR); | |
1084 | bno_cur_lt = NULL; | |
1085 | } | |
1086 | /* | |
1087 | * Left side is better. | |
1088 | */ | |
1089 | else { | |
1090 | xfs_btree_del_cursor( | |
1091 | bno_cur_gt, | |
1092 | XFS_BTREE_NOERROR); | |
1093 | bno_cur_gt = NULL; | |
1094 | } | |
1095 | break; | |
1096 | } | |
1097 | /* | |
1098 | * Fell off the right end. | |
1099 | */ | |
1100 | if ((error = xfs_alloc_increment( | |
1101 | bno_cur_gt, 0, &i))) | |
1102 | goto error0; | |
1103 | if (!i) { | |
1104 | xfs_btree_del_cursor( | |
1105 | bno_cur_gt, | |
1106 | XFS_BTREE_NOERROR); | |
1107 | bno_cur_gt = NULL; | |
1108 | break; | |
1109 | } | |
1110 | } | |
1111 | } | |
1112 | /* | |
1113 | * The left side is perfect, trash the right side. | |
1114 | */ | |
1115 | else { | |
1116 | xfs_btree_del_cursor(bno_cur_gt, | |
1117 | XFS_BTREE_NOERROR); | |
1118 | bno_cur_gt = NULL; | |
1119 | } | |
1120 | } | |
1121 | /* | |
1122 | * It's the right side that was found first, look left. | |
1123 | */ | |
1124 | else { | |
1125 | /* | |
1126 | * Fix up the length. | |
1127 | */ | |
1128 | args->len = XFS_EXTLEN_MIN(gtlena, args->maxlen); | |
1129 | xfs_alloc_fix_len(args); | |
1130 | rlen = args->len; | |
1131 | gtdiff = xfs_alloc_compute_diff(args->agbno, rlen, | |
1132 | args->alignment, gtbno, gtlen, >new); | |
1133 | /* | |
1134 | * Right side entry isn't perfect. | |
1135 | */ | |
1136 | if (gtdiff) { | |
1137 | /* | |
1138 | * Look until we find a better one, run out of | |
1139 | * space, or run off the end. | |
1140 | */ | |
1141 | while (bno_cur_lt && bno_cur_gt) { | |
1142 | if ((error = xfs_alloc_get_rec( | |
1143 | bno_cur_lt, <bno, | |
1144 | <len, &i))) | |
1145 | goto error0; | |
1146 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1147 | xfs_alloc_compute_aligned(ltbno, ltlen, | |
1148 | args->alignment, args->minlen, | |
1149 | <bnoa, <lena); | |
1150 | /* | |
1151 | * The right one is clearly better. | |
1152 | */ | |
1153 | if (ltbnoa <= args->agbno - gtdiff) { | |
1154 | xfs_btree_del_cursor( | |
1155 | bno_cur_lt, | |
1156 | XFS_BTREE_NOERROR); | |
1157 | bno_cur_lt = NULL; | |
1158 | break; | |
1159 | } | |
1160 | /* | |
1161 | * If we reach a big enough entry, | |
1162 | * compare the two and pick the best. | |
1163 | */ | |
1164 | if (ltlena >= args->minlen) { | |
1165 | args->len = XFS_EXTLEN_MIN( | |
1166 | ltlena, args->maxlen); | |
1167 | xfs_alloc_fix_len(args); | |
1168 | rlen = args->len; | |
1169 | ltdiff = xfs_alloc_compute_diff( | |
1170 | args->agbno, rlen, | |
1171 | args->alignment, | |
1172 | ltbno, ltlen, <new); | |
1173 | /* | |
1174 | * Left side is better. | |
1175 | */ | |
1176 | if (ltdiff < gtdiff) { | |
1177 | xfs_btree_del_cursor( | |
1178 | bno_cur_gt, | |
1179 | XFS_BTREE_NOERROR); | |
1180 | bno_cur_gt = NULL; | |
1181 | } | |
1182 | /* | |
1183 | * Right side is better. | |
1184 | */ | |
1185 | else { | |
1186 | xfs_btree_del_cursor( | |
1187 | bno_cur_lt, | |
1188 | XFS_BTREE_NOERROR); | |
1189 | bno_cur_lt = NULL; | |
1190 | } | |
1191 | break; | |
1192 | } | |
1193 | /* | |
1194 | * Fell off the left end. | |
1195 | */ | |
1196 | if ((error = xfs_alloc_decrement( | |
1197 | bno_cur_lt, 0, &i))) | |
1198 | goto error0; | |
1199 | if (!i) { | |
1200 | xfs_btree_del_cursor(bno_cur_lt, | |
1201 | XFS_BTREE_NOERROR); | |
1202 | bno_cur_lt = NULL; | |
1203 | break; | |
1204 | } | |
1205 | } | |
1206 | } | |
1207 | /* | |
1208 | * The right side is perfect, trash the left side. | |
1209 | */ | |
1210 | else { | |
1211 | xfs_btree_del_cursor(bno_cur_lt, | |
1212 | XFS_BTREE_NOERROR); | |
1213 | bno_cur_lt = NULL; | |
1214 | } | |
1215 | } | |
1216 | } | |
1217 | /* | |
1218 | * If we couldn't get anything, give up. | |
1219 | */ | |
1220 | if (bno_cur_lt == NULL && bno_cur_gt == NULL) { | |
1221 | TRACE_ALLOC("neither", args); | |
1222 | args->agbno = NULLAGBLOCK; | |
1223 | return 0; | |
1224 | } | |
1225 | /* | |
1226 | * At this point we have selected a freespace entry, either to the | |
1227 | * left or to the right. If it's on the right, copy all the | |
1228 | * useful variables to the "left" set so we only have one | |
1229 | * copy of this code. | |
1230 | */ | |
1231 | if (bno_cur_gt) { | |
1232 | bno_cur_lt = bno_cur_gt; | |
1233 | bno_cur_gt = NULL; | |
1234 | ltbno = gtbno; | |
1235 | ltbnoa = gtbnoa; | |
1236 | ltlen = gtlen; | |
1237 | ltlena = gtlena; | |
1238 | j = 1; | |
1239 | } else | |
1240 | j = 0; | |
1241 | /* | |
1242 | * Fix up the length and compute the useful address. | |
1243 | */ | |
1244 | ltend = ltbno + ltlen; | |
1245 | args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen); | |
1246 | xfs_alloc_fix_len(args); | |
1247 | if (!xfs_alloc_fix_minleft(args)) { | |
1248 | TRACE_ALLOC("nominleft", args); | |
1249 | xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_NOERROR); | |
1250 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1251 | return 0; | |
1252 | } | |
1253 | rlen = args->len; | |
1254 | (void)xfs_alloc_compute_diff(args->agbno, rlen, args->alignment, ltbno, | |
1255 | ltlen, <new); | |
1256 | ASSERT(ltnew >= ltbno); | |
1257 | ASSERT(ltnew + rlen <= ltend); | |
1258 | ASSERT(ltnew + rlen <= INT_GET(XFS_BUF_TO_AGF(args->agbp)->agf_length, | |
1259 | ARCH_CONVERT)); | |
1260 | args->agbno = ltnew; | |
1261 | if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur_lt, ltbno, ltlen, | |
1262 | ltnew, rlen, XFSA_FIXUP_BNO_OK))) | |
1263 | goto error0; | |
1264 | TRACE_ALLOC(j ? "gt" : "lt", args); | |
1265 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1266 | xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_NOERROR); | |
1267 | return 0; | |
1268 | ||
1269 | error0: | |
1270 | TRACE_ALLOC("error", args); | |
1271 | if (cnt_cur != NULL) | |
1272 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); | |
1273 | if (bno_cur_lt != NULL) | |
1274 | xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_ERROR); | |
1275 | if (bno_cur_gt != NULL) | |
1276 | xfs_btree_del_cursor(bno_cur_gt, XFS_BTREE_ERROR); | |
1277 | return error; | |
1278 | } | |
1279 | ||
1280 | /* | |
1281 | * Allocate a variable extent anywhere in the allocation group agno. | |
1282 | * Extent's length (returned in len) will be between minlen and maxlen, | |
1283 | * and of the form k * prod + mod unless there's nothing that large. | |
1284 | * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. | |
1285 | */ | |
1286 | STATIC int /* error */ | |
1287 | xfs_alloc_ag_vextent_size( | |
1288 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
1289 | { | |
1290 | xfs_btree_cur_t *bno_cur; /* cursor for bno btree */ | |
1291 | xfs_btree_cur_t *cnt_cur; /* cursor for cnt btree */ | |
1292 | int error; /* error result */ | |
1293 | xfs_agblock_t fbno; /* start of found freespace */ | |
1294 | xfs_extlen_t flen; /* length of found freespace */ | |
1295 | #ifdef XFS_ALLOC_TRACE | |
1296 | static char fname[] = "xfs_alloc_ag_vextent_size"; | |
1297 | #endif | |
1298 | int i; /* temp status variable */ | |
1299 | xfs_agblock_t rbno; /* returned block number */ | |
1300 | xfs_extlen_t rlen; /* length of returned extent */ | |
1301 | ||
1302 | /* | |
1303 | * Allocate and initialize a cursor for the by-size btree. | |
1304 | */ | |
1305 | cnt_cur = xfs_btree_init_cursor(args->mp, args->tp, args->agbp, | |
1306 | args->agno, XFS_BTNUM_CNT, NULL, 0); | |
1307 | bno_cur = NULL; | |
1308 | /* | |
1309 | * Look for an entry >= maxlen+alignment-1 blocks. | |
1310 | */ | |
1311 | if ((error = xfs_alloc_lookup_ge(cnt_cur, 0, | |
1312 | args->maxlen + args->alignment - 1, &i))) | |
1313 | goto error0; | |
1314 | /* | |
1315 | * If none, then pick up the last entry in the tree unless the | |
1316 | * tree is empty. | |
1317 | */ | |
1318 | if (!i) { | |
1319 | if ((error = xfs_alloc_ag_vextent_small(args, cnt_cur, &fbno, | |
1320 | &flen, &i))) | |
1321 | goto error0; | |
1322 | if (i == 0 || flen == 0) { | |
1323 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1324 | TRACE_ALLOC("noentry", args); | |
1325 | return 0; | |
1326 | } | |
1327 | ASSERT(i == 1); | |
1328 | } | |
1329 | /* | |
1330 | * There's a freespace as big as maxlen+alignment-1, get it. | |
1331 | */ | |
1332 | else { | |
1333 | if ((error = xfs_alloc_get_rec(cnt_cur, &fbno, &flen, &i))) | |
1334 | goto error0; | |
1335 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1336 | } | |
1337 | /* | |
1338 | * In the first case above, we got the last entry in the | |
1339 | * by-size btree. Now we check to see if the space hits maxlen | |
1340 | * once aligned; if not, we search left for something better. | |
1341 | * This can't happen in the second case above. | |
1342 | */ | |
1343 | xfs_alloc_compute_aligned(fbno, flen, args->alignment, args->minlen, | |
1344 | &rbno, &rlen); | |
1345 | rlen = XFS_EXTLEN_MIN(args->maxlen, rlen); | |
1346 | XFS_WANT_CORRUPTED_GOTO(rlen == 0 || | |
1347 | (rlen <= flen && rbno + rlen <= fbno + flen), error0); | |
1348 | if (rlen < args->maxlen) { | |
1349 | xfs_agblock_t bestfbno; | |
1350 | xfs_extlen_t bestflen; | |
1351 | xfs_agblock_t bestrbno; | |
1352 | xfs_extlen_t bestrlen; | |
1353 | ||
1354 | bestrlen = rlen; | |
1355 | bestrbno = rbno; | |
1356 | bestflen = flen; | |
1357 | bestfbno = fbno; | |
1358 | for (;;) { | |
1359 | if ((error = xfs_alloc_decrement(cnt_cur, 0, &i))) | |
1360 | goto error0; | |
1361 | if (i == 0) | |
1362 | break; | |
1363 | if ((error = xfs_alloc_get_rec(cnt_cur, &fbno, &flen, | |
1364 | &i))) | |
1365 | goto error0; | |
1366 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1367 | if (flen < bestrlen) | |
1368 | break; | |
1369 | xfs_alloc_compute_aligned(fbno, flen, args->alignment, | |
1370 | args->minlen, &rbno, &rlen); | |
1371 | rlen = XFS_EXTLEN_MIN(args->maxlen, rlen); | |
1372 | XFS_WANT_CORRUPTED_GOTO(rlen == 0 || | |
1373 | (rlen <= flen && rbno + rlen <= fbno + flen), | |
1374 | error0); | |
1375 | if (rlen > bestrlen) { | |
1376 | bestrlen = rlen; | |
1377 | bestrbno = rbno; | |
1378 | bestflen = flen; | |
1379 | bestfbno = fbno; | |
1380 | if (rlen == args->maxlen) | |
1381 | break; | |
1382 | } | |
1383 | } | |
1384 | if ((error = xfs_alloc_lookup_eq(cnt_cur, bestfbno, bestflen, | |
1385 | &i))) | |
1386 | goto error0; | |
1387 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1388 | rlen = bestrlen; | |
1389 | rbno = bestrbno; | |
1390 | flen = bestflen; | |
1391 | fbno = bestfbno; | |
1392 | } | |
1393 | args->wasfromfl = 0; | |
1394 | /* | |
1395 | * Fix up the length. | |
1396 | */ | |
1397 | args->len = rlen; | |
1398 | xfs_alloc_fix_len(args); | |
1399 | if (rlen < args->minlen || !xfs_alloc_fix_minleft(args)) { | |
1400 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1401 | TRACE_ALLOC("nominleft", args); | |
1402 | args->agbno = NULLAGBLOCK; | |
1403 | return 0; | |
1404 | } | |
1405 | rlen = args->len; | |
1406 | XFS_WANT_CORRUPTED_GOTO(rlen <= flen, error0); | |
1407 | /* | |
1408 | * Allocate and initialize a cursor for the by-block tree. | |
1409 | */ | |
1410 | bno_cur = xfs_btree_init_cursor(args->mp, args->tp, args->agbp, | |
1411 | args->agno, XFS_BTNUM_BNO, NULL, 0); | |
1412 | if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur, fbno, flen, | |
1413 | rbno, rlen, XFSA_FIXUP_CNT_OK))) | |
1414 | goto error0; | |
1415 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1416 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
1417 | cnt_cur = bno_cur = NULL; | |
1418 | args->len = rlen; | |
1419 | args->agbno = rbno; | |
1420 | XFS_WANT_CORRUPTED_GOTO( | |
1421 | args->agbno + args->len <= | |
1422 | INT_GET(XFS_BUF_TO_AGF(args->agbp)->agf_length, | |
1423 | ARCH_CONVERT), | |
1424 | error0); | |
1425 | TRACE_ALLOC("normal", args); | |
1426 | return 0; | |
1427 | ||
1428 | error0: | |
1429 | TRACE_ALLOC("error", args); | |
1430 | if (cnt_cur) | |
1431 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); | |
1432 | if (bno_cur) | |
1433 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); | |
1434 | return error; | |
1435 | } | |
1436 | ||
1437 | /* | |
1438 | * Deal with the case where only small freespaces remain. | |
1439 | * Either return the contents of the last freespace record, | |
1440 | * or allocate space from the freelist if there is nothing in the tree. | |
1441 | */ | |
1442 | STATIC int /* error */ | |
1443 | xfs_alloc_ag_vextent_small( | |
1444 | xfs_alloc_arg_t *args, /* allocation argument structure */ | |
1445 | xfs_btree_cur_t *ccur, /* by-size cursor */ | |
1446 | xfs_agblock_t *fbnop, /* result block number */ | |
1447 | xfs_extlen_t *flenp, /* result length */ | |
1448 | int *stat) /* status: 0-freelist, 1-normal/none */ | |
1449 | { | |
1450 | int error; | |
1451 | xfs_agblock_t fbno; | |
1452 | xfs_extlen_t flen; | |
1453 | #ifdef XFS_ALLOC_TRACE | |
1454 | static char fname[] = "xfs_alloc_ag_vextent_small"; | |
1455 | #endif | |
1456 | int i; | |
1457 | ||
1458 | if ((error = xfs_alloc_decrement(ccur, 0, &i))) | |
1459 | goto error0; | |
1460 | if (i) { | |
1461 | if ((error = xfs_alloc_get_rec(ccur, &fbno, &flen, &i))) | |
1462 | goto error0; | |
1463 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1464 | } | |
1465 | /* | |
1466 | * Nothing in the btree, try the freelist. Make sure | |
1467 | * to respect minleft even when pulling from the | |
1468 | * freelist. | |
1469 | */ | |
1470 | else if (args->minlen == 1 && args->alignment == 1 && !args->isfl && | |
1471 | (INT_GET(XFS_BUF_TO_AGF(args->agbp)->agf_flcount, | |
1472 | ARCH_CONVERT) > args->minleft)) { | |
1473 | if ((error = xfs_alloc_get_freelist(args->tp, args->agbp, &fbno))) | |
1474 | goto error0; | |
1475 | if (fbno != NULLAGBLOCK) { | |
1476 | if (args->userdata) { | |
1477 | xfs_buf_t *bp; | |
1478 | ||
1479 | bp = xfs_btree_get_bufs(args->mp, args->tp, | |
1480 | args->agno, fbno, 0); | |
1481 | xfs_trans_binval(args->tp, bp); | |
1482 | } | |
1483 | args->len = 1; | |
1484 | args->agbno = fbno; | |
1485 | XFS_WANT_CORRUPTED_GOTO( | |
1486 | args->agbno + args->len <= | |
1487 | INT_GET(XFS_BUF_TO_AGF(args->agbp)->agf_length, | |
1488 | ARCH_CONVERT), | |
1489 | error0); | |
1490 | args->wasfromfl = 1; | |
1491 | TRACE_ALLOC("freelist", args); | |
1492 | *stat = 0; | |
1493 | return 0; | |
1494 | } | |
1495 | /* | |
1496 | * Nothing in the freelist. | |
1497 | */ | |
1498 | else | |
1499 | flen = 0; | |
1500 | } | |
1501 | /* | |
1502 | * Can't allocate from the freelist for some reason. | |
1503 | */ | |
1504 | else | |
1505 | flen = 0; | |
1506 | /* | |
1507 | * Can't do the allocation, give up. | |
1508 | */ | |
1509 | if (flen < args->minlen) { | |
1510 | args->agbno = NULLAGBLOCK; | |
1511 | TRACE_ALLOC("notenough", args); | |
1512 | flen = 0; | |
1513 | } | |
1514 | *fbnop = fbno; | |
1515 | *flenp = flen; | |
1516 | *stat = 1; | |
1517 | TRACE_ALLOC("normal", args); | |
1518 | return 0; | |
1519 | ||
1520 | error0: | |
1521 | TRACE_ALLOC("error", args); | |
1522 | return error; | |
1523 | } | |
1524 | ||
1525 | /* | |
1526 | * Free the extent starting at agno/bno for length. | |
1527 | */ | |
1528 | STATIC int /* error */ | |
1529 | xfs_free_ag_extent( | |
1530 | xfs_trans_t *tp, /* transaction pointer */ | |
1531 | xfs_buf_t *agbp, /* buffer for a.g. freelist header */ | |
1532 | xfs_agnumber_t agno, /* allocation group number */ | |
1533 | xfs_agblock_t bno, /* starting block number */ | |
1534 | xfs_extlen_t len, /* length of extent */ | |
1535 | int isfl) /* set if is freelist blocks - no sb acctg */ | |
1536 | { | |
1537 | xfs_btree_cur_t *bno_cur; /* cursor for by-block btree */ | |
1538 | xfs_btree_cur_t *cnt_cur; /* cursor for by-size btree */ | |
1539 | int error; /* error return value */ | |
1540 | #ifdef XFS_ALLOC_TRACE | |
1541 | static char fname[] = "xfs_free_ag_extent"; | |
1542 | #endif | |
1543 | xfs_agblock_t gtbno; /* start of right neighbor block */ | |
1544 | xfs_extlen_t gtlen; /* length of right neighbor block */ | |
1545 | int haveleft; /* have a left neighbor block */ | |
1546 | int haveright; /* have a right neighbor block */ | |
1547 | int i; /* temp, result code */ | |
1548 | xfs_agblock_t ltbno; /* start of left neighbor block */ | |
1549 | xfs_extlen_t ltlen; /* length of left neighbor block */ | |
1550 | xfs_mount_t *mp; /* mount point struct for filesystem */ | |
1551 | xfs_agblock_t nbno; /* new starting block of freespace */ | |
1552 | xfs_extlen_t nlen; /* new length of freespace */ | |
1553 | ||
1554 | mp = tp->t_mountp; | |
1555 | /* | |
1556 | * Allocate and initialize a cursor for the by-block btree. | |
1557 | */ | |
1558 | bno_cur = xfs_btree_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_BNO, NULL, | |
1559 | 0); | |
1560 | cnt_cur = NULL; | |
1561 | /* | |
1562 | * Look for a neighboring block on the left (lower block numbers) | |
1563 | * that is contiguous with this space. | |
1564 | */ | |
1565 | if ((error = xfs_alloc_lookup_le(bno_cur, bno, len, &haveleft))) | |
1566 | goto error0; | |
1567 | if (haveleft) { | |
1568 | /* | |
1569 | * There is a block to our left. | |
1570 | */ | |
1571 | if ((error = xfs_alloc_get_rec(bno_cur, <bno, <len, &i))) | |
1572 | goto error0; | |
1573 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1574 | /* | |
1575 | * It's not contiguous, though. | |
1576 | */ | |
1577 | if (ltbno + ltlen < bno) | |
1578 | haveleft = 0; | |
1579 | else { | |
1580 | /* | |
1581 | * If this failure happens the request to free this | |
1582 | * space was invalid, it's (partly) already free. | |
1583 | * Very bad. | |
1584 | */ | |
1585 | XFS_WANT_CORRUPTED_GOTO(ltbno + ltlen <= bno, error0); | |
1586 | } | |
1587 | } | |
1588 | /* | |
1589 | * Look for a neighboring block on the right (higher block numbers) | |
1590 | * that is contiguous with this space. | |
1591 | */ | |
1592 | if ((error = xfs_alloc_increment(bno_cur, 0, &haveright))) | |
1593 | goto error0; | |
1594 | if (haveright) { | |
1595 | /* | |
1596 | * There is a block to our right. | |
1597 | */ | |
1598 | if ((error = xfs_alloc_get_rec(bno_cur, >bno, >len, &i))) | |
1599 | goto error0; | |
1600 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1601 | /* | |
1602 | * It's not contiguous, though. | |
1603 | */ | |
1604 | if (bno + len < gtbno) | |
1605 | haveright = 0; | |
1606 | else { | |
1607 | /* | |
1608 | * If this failure happens the request to free this | |
1609 | * space was invalid, it's (partly) already free. | |
1610 | * Very bad. | |
1611 | */ | |
1612 | XFS_WANT_CORRUPTED_GOTO(gtbno >= bno + len, error0); | |
1613 | } | |
1614 | } | |
1615 | /* | |
1616 | * Now allocate and initialize a cursor for the by-size tree. | |
1617 | */ | |
1618 | cnt_cur = xfs_btree_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_CNT, NULL, | |
1619 | 0); | |
1620 | /* | |
1621 | * Have both left and right contiguous neighbors. | |
1622 | * Merge all three into a single free block. | |
1623 | */ | |
1624 | if (haveleft && haveright) { | |
1625 | /* | |
1626 | * Delete the old by-size entry on the left. | |
1627 | */ | |
1628 | if ((error = xfs_alloc_lookup_eq(cnt_cur, ltbno, ltlen, &i))) | |
1629 | goto error0; | |
1630 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1631 | if ((error = xfs_alloc_delete(cnt_cur, &i))) | |
1632 | goto error0; | |
1633 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1634 | /* | |
1635 | * Delete the old by-size entry on the right. | |
1636 | */ | |
1637 | if ((error = xfs_alloc_lookup_eq(cnt_cur, gtbno, gtlen, &i))) | |
1638 | goto error0; | |
1639 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1640 | if ((error = xfs_alloc_delete(cnt_cur, &i))) | |
1641 | goto error0; | |
1642 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1643 | /* | |
1644 | * Delete the old by-block entry for the right block. | |
1645 | */ | |
1646 | if ((error = xfs_alloc_delete(bno_cur, &i))) | |
1647 | goto error0; | |
1648 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1649 | /* | |
1650 | * Move the by-block cursor back to the left neighbor. | |
1651 | */ | |
1652 | if ((error = xfs_alloc_decrement(bno_cur, 0, &i))) | |
1653 | goto error0; | |
1654 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1655 | #ifdef DEBUG | |
1656 | /* | |
1657 | * Check that this is the right record: delete didn't | |
1658 | * mangle the cursor. | |
1659 | */ | |
1660 | { | |
1661 | xfs_agblock_t xxbno; | |
1662 | xfs_extlen_t xxlen; | |
1663 | ||
1664 | if ((error = xfs_alloc_get_rec(bno_cur, &xxbno, &xxlen, | |
1665 | &i))) | |
1666 | goto error0; | |
1667 | XFS_WANT_CORRUPTED_GOTO( | |
1668 | i == 1 && xxbno == ltbno && xxlen == ltlen, | |
1669 | error0); | |
1670 | } | |
1671 | #endif | |
1672 | /* | |
1673 | * Update remaining by-block entry to the new, joined block. | |
1674 | */ | |
1675 | nbno = ltbno; | |
1676 | nlen = len + ltlen + gtlen; | |
1677 | if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) | |
1678 | goto error0; | |
1679 | } | |
1680 | /* | |
1681 | * Have only a left contiguous neighbor. | |
1682 | * Merge it together with the new freespace. | |
1683 | */ | |
1684 | else if (haveleft) { | |
1685 | /* | |
1686 | * Delete the old by-size entry on the left. | |
1687 | */ | |
1688 | if ((error = xfs_alloc_lookup_eq(cnt_cur, ltbno, ltlen, &i))) | |
1689 | goto error0; | |
1690 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1691 | if ((error = xfs_alloc_delete(cnt_cur, &i))) | |
1692 | goto error0; | |
1693 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1694 | /* | |
1695 | * Back up the by-block cursor to the left neighbor, and | |
1696 | * update its length. | |
1697 | */ | |
1698 | if ((error = xfs_alloc_decrement(bno_cur, 0, &i))) | |
1699 | goto error0; | |
1700 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1701 | nbno = ltbno; | |
1702 | nlen = len + ltlen; | |
1703 | if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) | |
1704 | goto error0; | |
1705 | } | |
1706 | /* | |
1707 | * Have only a right contiguous neighbor. | |
1708 | * Merge it together with the new freespace. | |
1709 | */ | |
1710 | else if (haveright) { | |
1711 | /* | |
1712 | * Delete the old by-size entry on the right. | |
1713 | */ | |
1714 | if ((error = xfs_alloc_lookup_eq(cnt_cur, gtbno, gtlen, &i))) | |
1715 | goto error0; | |
1716 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1717 | if ((error = xfs_alloc_delete(cnt_cur, &i))) | |
1718 | goto error0; | |
1719 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1720 | /* | |
1721 | * Update the starting block and length of the right | |
1722 | * neighbor in the by-block tree. | |
1723 | */ | |
1724 | nbno = bno; | |
1725 | nlen = len + gtlen; | |
1726 | if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) | |
1727 | goto error0; | |
1728 | } | |
1729 | /* | |
1730 | * No contiguous neighbors. | |
1731 | * Insert the new freespace into the by-block tree. | |
1732 | */ | |
1733 | else { | |
1734 | nbno = bno; | |
1735 | nlen = len; | |
1736 | if ((error = xfs_alloc_insert(bno_cur, &i))) | |
1737 | goto error0; | |
1738 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1739 | } | |
1740 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
1741 | bno_cur = NULL; | |
1742 | /* | |
1743 | * In all cases we need to insert the new freespace in the by-size tree. | |
1744 | */ | |
1745 | if ((error = xfs_alloc_lookup_eq(cnt_cur, nbno, nlen, &i))) | |
1746 | goto error0; | |
1747 | XFS_WANT_CORRUPTED_GOTO(i == 0, error0); | |
1748 | if ((error = xfs_alloc_insert(cnt_cur, &i))) | |
1749 | goto error0; | |
1750 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1751 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1752 | cnt_cur = NULL; | |
1753 | /* | |
1754 | * Update the freespace totals in the ag and superblock. | |
1755 | */ | |
1756 | { | |
1757 | xfs_agf_t *agf; | |
1758 | xfs_perag_t *pag; /* per allocation group data */ | |
1759 | ||
1760 | agf = XFS_BUF_TO_AGF(agbp); | |
1761 | pag = &mp->m_perag[agno]; | |
1762 | INT_MOD(agf->agf_freeblks, ARCH_CONVERT, len); | |
1763 | xfs_trans_agblocks_delta(tp, len); | |
1764 | pag->pagf_freeblks += len; | |
1765 | XFS_WANT_CORRUPTED_GOTO( | |
1766 | INT_GET(agf->agf_freeblks, ARCH_CONVERT) | |
1767 | <= INT_GET(agf->agf_length, ARCH_CONVERT), | |
1768 | error0); | |
1769 | TRACE_MODAGF(NULL, agf, XFS_AGF_FREEBLKS); | |
1770 | xfs_alloc_log_agf(tp, agbp, XFS_AGF_FREEBLKS); | |
1771 | if (!isfl) | |
1772 | xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, (long)len); | |
1773 | XFS_STATS_INC(xs_freex); | |
1774 | XFS_STATS_ADD(xs_freeb, len); | |
1775 | } | |
1776 | TRACE_FREE(haveleft ? | |
1777 | (haveright ? "both" : "left") : | |
1778 | (haveright ? "right" : "none"), | |
1779 | agno, bno, len, isfl); | |
1780 | ||
1781 | /* | |
1782 | * Since blocks move to the free list without the coordination | |
1783 | * used in xfs_bmap_finish, we can't allow block to be available | |
1784 | * for reallocation and non-transaction writing (user data) | |
1785 | * until we know that the transaction that moved it to the free | |
1786 | * list is permanently on disk. We track the blocks by declaring | |
1787 | * these blocks as "busy"; the busy list is maintained on a per-ag | |
1788 | * basis and each transaction records which entries should be removed | |
1789 | * when the iclog commits to disk. If a busy block is allocated, | |
1790 | * the iclog is pushed up to the LSN that freed the block. | |
1791 | */ | |
1792 | xfs_alloc_mark_busy(tp, agno, bno, len); | |
1793 | return 0; | |
1794 | ||
1795 | error0: | |
1796 | TRACE_FREE("error", agno, bno, len, isfl); | |
1797 | if (bno_cur) | |
1798 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); | |
1799 | if (cnt_cur) | |
1800 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); | |
1801 | return error; | |
1802 | } | |
1803 | ||
1804 | /* | |
1805 | * Visible (exported) allocation/free functions. | |
1806 | * Some of these are used just by xfs_alloc_btree.c and this file. | |
1807 | */ | |
1808 | ||
1809 | /* | |
1810 | * Compute and fill in value of m_ag_maxlevels. | |
1811 | */ | |
1812 | void | |
1813 | xfs_alloc_compute_maxlevels( | |
1814 | xfs_mount_t *mp) /* file system mount structure */ | |
1815 | { | |
1816 | int level; | |
1817 | uint maxblocks; | |
1818 | uint maxleafents; | |
1819 | int minleafrecs; | |
1820 | int minnoderecs; | |
1821 | ||
1822 | maxleafents = (mp->m_sb.sb_agblocks + 1) / 2; | |
1823 | minleafrecs = mp->m_alloc_mnr[0]; | |
1824 | minnoderecs = mp->m_alloc_mnr[1]; | |
1825 | maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs; | |
1826 | for (level = 1; maxblocks > 1; level++) | |
1827 | maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs; | |
1828 | mp->m_ag_maxlevels = level; | |
1829 | } | |
1830 | ||
1831 | /* | |
1832 | * Decide whether to use this allocation group for this allocation. | |
1833 | * If so, fix up the btree freelist's size. | |
1834 | */ | |
1835 | STATIC int /* error */ | |
1836 | xfs_alloc_fix_freelist( | |
1837 | xfs_alloc_arg_t *args, /* allocation argument structure */ | |
1838 | int flags) /* XFS_ALLOC_FLAG_... */ | |
1839 | { | |
1840 | xfs_buf_t *agbp; /* agf buffer pointer */ | |
1841 | xfs_agf_t *agf; /* a.g. freespace structure pointer */ | |
1842 | xfs_buf_t *agflbp;/* agfl buffer pointer */ | |
1843 | xfs_agblock_t bno; /* freelist block */ | |
1844 | xfs_extlen_t delta; /* new blocks needed in freelist */ | |
1845 | int error; /* error result code */ | |
1846 | xfs_extlen_t longest;/* longest extent in allocation group */ | |
1847 | xfs_mount_t *mp; /* file system mount point structure */ | |
1848 | xfs_extlen_t need; /* total blocks needed in freelist */ | |
1849 | xfs_perag_t *pag; /* per-ag information structure */ | |
1850 | xfs_alloc_arg_t targs; /* local allocation arguments */ | |
1851 | xfs_trans_t *tp; /* transaction pointer */ | |
1852 | ||
1853 | mp = args->mp; | |
1854 | ||
1855 | pag = args->pag; | |
1856 | tp = args->tp; | |
1857 | if (!pag->pagf_init) { | |
1858 | if ((error = xfs_alloc_read_agf(mp, tp, args->agno, flags, | |
1859 | &agbp))) | |
1860 | return error; | |
1861 | if (!pag->pagf_init) { | |
1862 | args->agbp = NULL; | |
1863 | return 0; | |
1864 | } | |
1865 | } else | |
1866 | agbp = NULL; | |
1867 | ||
1868 | /* If this is a metadata prefered pag and we are user data | |
1869 | * then try somewhere else if we are not being asked to | |
1870 | * try harder at this point | |
1871 | */ | |
1872 | if (pag->pagf_metadata && args->userdata && flags) { | |
1873 | args->agbp = NULL; | |
1874 | return 0; | |
1875 | } | |
1876 | ||
1877 | need = XFS_MIN_FREELIST_PAG(pag, mp); | |
1878 | delta = need > pag->pagf_flcount ? need - pag->pagf_flcount : 0; | |
1879 | /* | |
1880 | * If it looks like there isn't a long enough extent, or enough | |
1881 | * total blocks, reject it. | |
1882 | */ | |
1883 | longest = (pag->pagf_longest > delta) ? | |
1884 | (pag->pagf_longest - delta) : | |
1885 | (pag->pagf_flcount > 0 || pag->pagf_longest > 0); | |
1886 | if (args->minlen + args->alignment + args->minalignslop - 1 > longest || | |
1887 | (args->minleft && | |
1888 | (int)(pag->pagf_freeblks + pag->pagf_flcount - | |
1889 | need - args->total) < | |
1890 | (int)args->minleft)) { | |
1891 | if (agbp) | |
1892 | xfs_trans_brelse(tp, agbp); | |
1893 | args->agbp = NULL; | |
1894 | return 0; | |
1895 | } | |
1896 | /* | |
1897 | * Get the a.g. freespace buffer. | |
1898 | * Can fail if we're not blocking on locks, and it's held. | |
1899 | */ | |
1900 | if (agbp == NULL) { | |
1901 | if ((error = xfs_alloc_read_agf(mp, tp, args->agno, flags, | |
1902 | &agbp))) | |
1903 | return error; | |
1904 | if (agbp == NULL) { | |
1905 | args->agbp = NULL; | |
1906 | return 0; | |
1907 | } | |
1908 | } | |
1909 | /* | |
1910 | * Figure out how many blocks we should have in the freelist. | |
1911 | */ | |
1912 | agf = XFS_BUF_TO_AGF(agbp); | |
1913 | need = XFS_MIN_FREELIST(agf, mp); | |
1914 | delta = need > INT_GET(agf->agf_flcount, ARCH_CONVERT) ? | |
1915 | (need - INT_GET(agf->agf_flcount, ARCH_CONVERT)) : 0; | |
1916 | /* | |
1917 | * If there isn't enough total or single-extent, reject it. | |
1918 | */ | |
1919 | longest = INT_GET(agf->agf_longest, ARCH_CONVERT); | |
1920 | longest = (longest > delta) ? (longest - delta) : | |
1921 | (INT_GET(agf->agf_flcount, ARCH_CONVERT) > 0 || longest > 0); | |
1922 | if (args->minlen + args->alignment + args->minalignslop - 1 > longest || | |
1923 | (args->minleft && | |
1924 | (int)(INT_GET(agf->agf_freeblks, ARCH_CONVERT) + | |
1925 | INT_GET(agf->agf_flcount, ARCH_CONVERT) - need - args->total) < | |
1926 | (int)args->minleft)) { | |
1927 | xfs_trans_brelse(tp, agbp); | |
1928 | args->agbp = NULL; | |
1929 | return 0; | |
1930 | } | |
1931 | /* | |
1932 | * Make the freelist shorter if it's too long. | |
1933 | */ | |
1934 | while (INT_GET(agf->agf_flcount, ARCH_CONVERT) > need) { | |
1935 | xfs_buf_t *bp; | |
1936 | ||
1937 | if ((error = xfs_alloc_get_freelist(tp, agbp, &bno))) | |
1938 | return error; | |
1939 | if ((error = xfs_free_ag_extent(tp, agbp, args->agno, bno, 1, 1))) | |
1940 | return error; | |
1941 | bp = xfs_btree_get_bufs(mp, tp, args->agno, bno, 0); | |
1942 | xfs_trans_binval(tp, bp); | |
1943 | } | |
1944 | /* | |
1945 | * Initialize the args structure. | |
1946 | */ | |
1947 | targs.tp = tp; | |
1948 | targs.mp = mp; | |
1949 | targs.agbp = agbp; | |
1950 | targs.agno = args->agno; | |
1951 | targs.mod = targs.minleft = targs.wasdel = targs.userdata = | |
1952 | targs.minalignslop = 0; | |
1953 | targs.alignment = targs.minlen = targs.prod = targs.isfl = 1; | |
1954 | targs.type = XFS_ALLOCTYPE_THIS_AG; | |
1955 | targs.pag = pag; | |
1956 | if ((error = xfs_alloc_read_agfl(mp, tp, targs.agno, &agflbp))) | |
1957 | return error; | |
1958 | /* | |
1959 | * Make the freelist longer if it's too short. | |
1960 | */ | |
1961 | while (INT_GET(agf->agf_flcount, ARCH_CONVERT) < need) { | |
1962 | targs.agbno = 0; | |
1963 | targs.maxlen = need - INT_GET(agf->agf_flcount, ARCH_CONVERT); | |
1964 | /* | |
1965 | * Allocate as many blocks as possible at once. | |
1966 | */ | |
1967 | if ((error = xfs_alloc_ag_vextent(&targs))) | |
1968 | return error; | |
1969 | /* | |
1970 | * Stop if we run out. Won't happen if callers are obeying | |
1971 | * the restrictions correctly. Can happen for free calls | |
1972 | * on a completely full ag. | |
1973 | */ | |
1974 | if (targs.agbno == NULLAGBLOCK) | |
1975 | break; | |
1976 | /* | |
1977 | * Put each allocated block on the list. | |
1978 | */ | |
1979 | for (bno = targs.agbno; bno < targs.agbno + targs.len; bno++) { | |
1980 | if ((error = xfs_alloc_put_freelist(tp, agbp, agflbp, | |
1981 | bno))) | |
1982 | return error; | |
1983 | } | |
1984 | } | |
1985 | args->agbp = agbp; | |
1986 | return 0; | |
1987 | } | |
1988 | ||
1989 | /* | |
1990 | * Get a block from the freelist. | |
1991 | * Returns with the buffer for the block gotten. | |
1992 | */ | |
1993 | int /* error */ | |
1994 | xfs_alloc_get_freelist( | |
1995 | xfs_trans_t *tp, /* transaction pointer */ | |
1996 | xfs_buf_t *agbp, /* buffer containing the agf structure */ | |
1997 | xfs_agblock_t *bnop) /* block address retrieved from freelist */ | |
1998 | { | |
1999 | xfs_agf_t *agf; /* a.g. freespace structure */ | |
2000 | xfs_agfl_t *agfl; /* a.g. freelist structure */ | |
2001 | xfs_buf_t *agflbp;/* buffer for a.g. freelist structure */ | |
2002 | xfs_agblock_t bno; /* block number returned */ | |
2003 | int error; | |
2004 | #ifdef XFS_ALLOC_TRACE | |
2005 | static char fname[] = "xfs_alloc_get_freelist"; | |
2006 | #endif | |
2007 | xfs_mount_t *mp; /* mount structure */ | |
2008 | xfs_perag_t *pag; /* per allocation group data */ | |
2009 | ||
2010 | agf = XFS_BUF_TO_AGF(agbp); | |
2011 | /* | |
2012 | * Freelist is empty, give up. | |
2013 | */ | |
2014 | if (!agf->agf_flcount) { | |
2015 | *bnop = NULLAGBLOCK; | |
2016 | return 0; | |
2017 | } | |
2018 | /* | |
2019 | * Read the array of free blocks. | |
2020 | */ | |
2021 | mp = tp->t_mountp; | |
2022 | if ((error = xfs_alloc_read_agfl(mp, tp, | |
2023 | INT_GET(agf->agf_seqno, ARCH_CONVERT), &agflbp))) | |
2024 | return error; | |
2025 | agfl = XFS_BUF_TO_AGFL(agflbp); | |
2026 | /* | |
2027 | * Get the block number and update the data structures. | |
2028 | */ | |
2029 | bno = INT_GET(agfl->agfl_bno[INT_GET(agf->agf_flfirst, ARCH_CONVERT)], ARCH_CONVERT); | |
2030 | INT_MOD(agf->agf_flfirst, ARCH_CONVERT, 1); | |
2031 | xfs_trans_brelse(tp, agflbp); | |
2032 | if (INT_GET(agf->agf_flfirst, ARCH_CONVERT) == XFS_AGFL_SIZE(mp)) | |
2033 | agf->agf_flfirst = 0; | |
2034 | pag = &mp->m_perag[INT_GET(agf->agf_seqno, ARCH_CONVERT)]; | |
2035 | INT_MOD(agf->agf_flcount, ARCH_CONVERT, -1); | |
2036 | xfs_trans_agflist_delta(tp, -1); | |
2037 | pag->pagf_flcount--; | |
2038 | TRACE_MODAGF(NULL, agf, XFS_AGF_FLFIRST | XFS_AGF_FLCOUNT); | |
2039 | xfs_alloc_log_agf(tp, agbp, XFS_AGF_FLFIRST | XFS_AGF_FLCOUNT); | |
2040 | *bnop = bno; | |
2041 | ||
2042 | /* | |
2043 | * As blocks are freed, they are added to the per-ag busy list | |
2044 | * and remain there until the freeing transaction is committed to | |
2045 | * disk. Now that we have allocated blocks, this list must be | |
2046 | * searched to see if a block is being reused. If one is, then | |
2047 | * the freeing transaction must be pushed to disk NOW by forcing | |
2048 | * to disk all iclogs up that transaction's LSN. | |
2049 | */ | |
2050 | xfs_alloc_search_busy(tp, INT_GET(agf->agf_seqno, ARCH_CONVERT), bno, 1); | |
2051 | return 0; | |
2052 | } | |
2053 | ||
2054 | /* | |
2055 | * Log the given fields from the agf structure. | |
2056 | */ | |
2057 | void | |
2058 | xfs_alloc_log_agf( | |
2059 | xfs_trans_t *tp, /* transaction pointer */ | |
2060 | xfs_buf_t *bp, /* buffer for a.g. freelist header */ | |
2061 | int fields) /* mask of fields to be logged (XFS_AGF_...) */ | |
2062 | { | |
2063 | int first; /* first byte offset */ | |
2064 | int last; /* last byte offset */ | |
2065 | static const short offsets[] = { | |
2066 | offsetof(xfs_agf_t, agf_magicnum), | |
2067 | offsetof(xfs_agf_t, agf_versionnum), | |
2068 | offsetof(xfs_agf_t, agf_seqno), | |
2069 | offsetof(xfs_agf_t, agf_length), | |
2070 | offsetof(xfs_agf_t, agf_roots[0]), | |
2071 | offsetof(xfs_agf_t, agf_levels[0]), | |
2072 | offsetof(xfs_agf_t, agf_flfirst), | |
2073 | offsetof(xfs_agf_t, agf_fllast), | |
2074 | offsetof(xfs_agf_t, agf_flcount), | |
2075 | offsetof(xfs_agf_t, agf_freeblks), | |
2076 | offsetof(xfs_agf_t, agf_longest), | |
2077 | sizeof(xfs_agf_t) | |
2078 | }; | |
2079 | ||
2080 | xfs_btree_offsets(fields, offsets, XFS_AGF_NUM_BITS, &first, &last); | |
2081 | xfs_trans_log_buf(tp, bp, (uint)first, (uint)last); | |
2082 | } | |
2083 | ||
2084 | /* | |
2085 | * Interface for inode allocation to force the pag data to be initialized. | |
2086 | */ | |
2087 | int /* error */ | |
2088 | xfs_alloc_pagf_init( | |
2089 | xfs_mount_t *mp, /* file system mount structure */ | |
2090 | xfs_trans_t *tp, /* transaction pointer */ | |
2091 | xfs_agnumber_t agno, /* allocation group number */ | |
2092 | int flags) /* XFS_ALLOC_FLAGS_... */ | |
2093 | { | |
2094 | xfs_buf_t *bp; | |
2095 | int error; | |
2096 | ||
2097 | if ((error = xfs_alloc_read_agf(mp, tp, agno, flags, &bp))) | |
2098 | return error; | |
2099 | if (bp) | |
2100 | xfs_trans_brelse(tp, bp); | |
2101 | return 0; | |
2102 | } | |
2103 | ||
2104 | /* | |
2105 | * Put the block on the freelist for the allocation group. | |
2106 | */ | |
2107 | int /* error */ | |
2108 | xfs_alloc_put_freelist( | |
2109 | xfs_trans_t *tp, /* transaction pointer */ | |
2110 | xfs_buf_t *agbp, /* buffer for a.g. freelist header */ | |
2111 | xfs_buf_t *agflbp,/* buffer for a.g. free block array */ | |
2112 | xfs_agblock_t bno) /* block being freed */ | |
2113 | { | |
2114 | xfs_agf_t *agf; /* a.g. freespace structure */ | |
2115 | xfs_agfl_t *agfl; /* a.g. free block array */ | |
2116 | xfs_agblock_t *blockp;/* pointer to array entry */ | |
2117 | int error; | |
2118 | #ifdef XFS_ALLOC_TRACE | |
2119 | static char fname[] = "xfs_alloc_put_freelist"; | |
2120 | #endif | |
2121 | xfs_mount_t *mp; /* mount structure */ | |
2122 | xfs_perag_t *pag; /* per allocation group data */ | |
2123 | ||
2124 | agf = XFS_BUF_TO_AGF(agbp); | |
2125 | mp = tp->t_mountp; | |
2126 | ||
2127 | if (!agflbp && (error = xfs_alloc_read_agfl(mp, tp, | |
2128 | INT_GET(agf->agf_seqno, ARCH_CONVERT), &agflbp))) | |
2129 | return error; | |
2130 | agfl = XFS_BUF_TO_AGFL(agflbp); | |
2131 | INT_MOD(agf->agf_fllast, ARCH_CONVERT, 1); | |
2132 | if (INT_GET(agf->agf_fllast, ARCH_CONVERT) == XFS_AGFL_SIZE(mp)) | |
2133 | agf->agf_fllast = 0; | |
2134 | pag = &mp->m_perag[INT_GET(agf->agf_seqno, ARCH_CONVERT)]; | |
2135 | INT_MOD(agf->agf_flcount, ARCH_CONVERT, 1); | |
2136 | xfs_trans_agflist_delta(tp, 1); | |
2137 | pag->pagf_flcount++; | |
2138 | ASSERT(INT_GET(agf->agf_flcount, ARCH_CONVERT) <= XFS_AGFL_SIZE(mp)); | |
2139 | blockp = &agfl->agfl_bno[INT_GET(agf->agf_fllast, ARCH_CONVERT)]; | |
2140 | INT_SET(*blockp, ARCH_CONVERT, bno); | |
2141 | TRACE_MODAGF(NULL, agf, XFS_AGF_FLLAST | XFS_AGF_FLCOUNT); | |
2142 | xfs_alloc_log_agf(tp, agbp, XFS_AGF_FLLAST | XFS_AGF_FLCOUNT); | |
2143 | xfs_trans_log_buf(tp, agflbp, | |
2144 | (int)((xfs_caddr_t)blockp - (xfs_caddr_t)agfl), | |
2145 | (int)((xfs_caddr_t)blockp - (xfs_caddr_t)agfl + | |
2146 | sizeof(xfs_agblock_t) - 1)); | |
2147 | return 0; | |
2148 | } | |
2149 | ||
2150 | /* | |
2151 | * Read in the allocation group header (free/alloc section). | |
2152 | */ | |
2153 | int /* error */ | |
2154 | xfs_alloc_read_agf( | |
2155 | xfs_mount_t *mp, /* mount point structure */ | |
2156 | xfs_trans_t *tp, /* transaction pointer */ | |
2157 | xfs_agnumber_t agno, /* allocation group number */ | |
2158 | int flags, /* XFS_ALLOC_FLAG_... */ | |
2159 | xfs_buf_t **bpp) /* buffer for the ag freelist header */ | |
2160 | { | |
2161 | xfs_agf_t *agf; /* ag freelist header */ | |
2162 | int agf_ok; /* set if agf is consistent */ | |
2163 | xfs_buf_t *bp; /* return value */ | |
2164 | xfs_perag_t *pag; /* per allocation group data */ | |
2165 | int error; | |
2166 | ||
2167 | ASSERT(agno != NULLAGNUMBER); | |
2168 | error = xfs_trans_read_buf( | |
2169 | mp, tp, mp->m_ddev_targp, | |
2170 | XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), | |
2171 | XFS_FSS_TO_BB(mp, 1), | |
2172 | (flags & XFS_ALLOC_FLAG_TRYLOCK) ? XFS_BUF_TRYLOCK : 0U, | |
2173 | &bp); | |
2174 | if (error) | |
2175 | return error; | |
2176 | ASSERT(!bp || !XFS_BUF_GETERROR(bp)); | |
2177 | if (!bp) { | |
2178 | *bpp = NULL; | |
2179 | return 0; | |
2180 | } | |
2181 | /* | |
2182 | * Validate the magic number of the agf block. | |
2183 | */ | |
2184 | agf = XFS_BUF_TO_AGF(bp); | |
2185 | agf_ok = | |
2186 | INT_GET(agf->agf_magicnum, ARCH_CONVERT) == XFS_AGF_MAGIC && | |
2187 | XFS_AGF_GOOD_VERSION( | |
2188 | INT_GET(agf->agf_versionnum, ARCH_CONVERT)) && | |
2189 | INT_GET(agf->agf_freeblks, ARCH_CONVERT) <= | |
2190 | INT_GET(agf->agf_length, ARCH_CONVERT) && | |
2191 | INT_GET(agf->agf_flfirst, ARCH_CONVERT) < XFS_AGFL_SIZE(mp) && | |
2192 | INT_GET(agf->agf_fllast, ARCH_CONVERT) < XFS_AGFL_SIZE(mp) && | |
2193 | INT_GET(agf->agf_flcount, ARCH_CONVERT) <= XFS_AGFL_SIZE(mp); | |
2194 | if (unlikely(XFS_TEST_ERROR(!agf_ok, mp, XFS_ERRTAG_ALLOC_READ_AGF, | |
2195 | XFS_RANDOM_ALLOC_READ_AGF))) { | |
2196 | XFS_CORRUPTION_ERROR("xfs_alloc_read_agf", | |
2197 | XFS_ERRLEVEL_LOW, mp, agf); | |
2198 | xfs_trans_brelse(tp, bp); | |
2199 | return XFS_ERROR(EFSCORRUPTED); | |
2200 | } | |
2201 | pag = &mp->m_perag[agno]; | |
2202 | if (!pag->pagf_init) { | |
2203 | pag->pagf_freeblks = INT_GET(agf->agf_freeblks, ARCH_CONVERT); | |
2204 | pag->pagf_flcount = INT_GET(agf->agf_flcount, ARCH_CONVERT); | |
2205 | pag->pagf_longest = INT_GET(agf->agf_longest, ARCH_CONVERT); | |
2206 | pag->pagf_levels[XFS_BTNUM_BNOi] = | |
2207 | INT_GET(agf->agf_levels[XFS_BTNUM_BNOi], ARCH_CONVERT); | |
2208 | pag->pagf_levels[XFS_BTNUM_CNTi] = | |
2209 | INT_GET(agf->agf_levels[XFS_BTNUM_CNTi], ARCH_CONVERT); | |
2210 | spinlock_init(&pag->pagb_lock, "xfspagb"); | |
2211 | pag->pagb_list = kmem_zalloc(XFS_PAGB_NUM_SLOTS * | |
2212 | sizeof(xfs_perag_busy_t), KM_SLEEP); | |
2213 | pag->pagf_init = 1; | |
2214 | } | |
2215 | #ifdef DEBUG | |
2216 | else if (!XFS_FORCED_SHUTDOWN(mp)) { | |
2217 | ASSERT(pag->pagf_freeblks == INT_GET(agf->agf_freeblks, ARCH_CONVERT)); | |
2218 | ASSERT(pag->pagf_flcount == INT_GET(agf->agf_flcount, ARCH_CONVERT)); | |
2219 | ASSERT(pag->pagf_longest == INT_GET(agf->agf_longest, ARCH_CONVERT)); | |
2220 | ASSERT(pag->pagf_levels[XFS_BTNUM_BNOi] == | |
2221 | INT_GET(agf->agf_levels[XFS_BTNUM_BNOi], ARCH_CONVERT)); | |
2222 | ASSERT(pag->pagf_levels[XFS_BTNUM_CNTi] == | |
2223 | INT_GET(agf->agf_levels[XFS_BTNUM_CNTi], ARCH_CONVERT)); | |
2224 | } | |
2225 | #endif | |
2226 | XFS_BUF_SET_VTYPE_REF(bp, B_FS_AGF, XFS_AGF_REF); | |
2227 | *bpp = bp; | |
2228 | return 0; | |
2229 | } | |
2230 | ||
2231 | /* | |
2232 | * Allocate an extent (variable-size). | |
2233 | * Depending on the allocation type, we either look in a single allocation | |
2234 | * group or loop over the allocation groups to find the result. | |
2235 | */ | |
2236 | int /* error */ | |
2237 | xfs_alloc_vextent( | |
2238 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
2239 | { | |
2240 | xfs_agblock_t agsize; /* allocation group size */ | |
2241 | int error; | |
2242 | int flags; /* XFS_ALLOC_FLAG_... locking flags */ | |
2243 | #ifdef XFS_ALLOC_TRACE | |
2244 | static char fname[] = "xfs_alloc_vextent"; | |
2245 | #endif | |
2246 | xfs_extlen_t minleft;/* minimum left value, temp copy */ | |
2247 | xfs_mount_t *mp; /* mount structure pointer */ | |
2248 | xfs_agnumber_t sagno; /* starting allocation group number */ | |
2249 | xfs_alloctype_t type; /* input allocation type */ | |
2250 | int bump_rotor = 0; | |
2251 | int no_min = 0; | |
2252 | xfs_agnumber_t rotorstep = xfs_rotorstep; /* inode32 agf stepper */ | |
2253 | ||
2254 | mp = args->mp; | |
2255 | type = args->otype = args->type; | |
2256 | args->agbno = NULLAGBLOCK; | |
2257 | /* | |
2258 | * Just fix this up, for the case where the last a.g. is shorter | |
2259 | * (or there's only one a.g.) and the caller couldn't easily figure | |
2260 | * that out (xfs_bmap_alloc). | |
2261 | */ | |
2262 | agsize = mp->m_sb.sb_agblocks; | |
2263 | if (args->maxlen > agsize) | |
2264 | args->maxlen = agsize; | |
2265 | if (args->alignment == 0) | |
2266 | args->alignment = 1; | |
2267 | ASSERT(XFS_FSB_TO_AGNO(mp, args->fsbno) < mp->m_sb.sb_agcount); | |
2268 | ASSERT(XFS_FSB_TO_AGBNO(mp, args->fsbno) < agsize); | |
2269 | ASSERT(args->minlen <= args->maxlen); | |
2270 | ASSERT(args->minlen <= agsize); | |
2271 | ASSERT(args->mod < args->prod); | |
2272 | if (XFS_FSB_TO_AGNO(mp, args->fsbno) >= mp->m_sb.sb_agcount || | |
2273 | XFS_FSB_TO_AGBNO(mp, args->fsbno) >= agsize || | |
2274 | args->minlen > args->maxlen || args->minlen > agsize || | |
2275 | args->mod >= args->prod) { | |
2276 | args->fsbno = NULLFSBLOCK; | |
2277 | TRACE_ALLOC("badargs", args); | |
2278 | return 0; | |
2279 | } | |
2280 | minleft = args->minleft; | |
2281 | ||
2282 | switch (type) { | |
2283 | case XFS_ALLOCTYPE_THIS_AG: | |
2284 | case XFS_ALLOCTYPE_NEAR_BNO: | |
2285 | case XFS_ALLOCTYPE_THIS_BNO: | |
2286 | /* | |
2287 | * These three force us into a single a.g. | |
2288 | */ | |
2289 | args->agno = XFS_FSB_TO_AGNO(mp, args->fsbno); | |
2290 | down_read(&mp->m_peraglock); | |
2291 | args->pag = &mp->m_perag[args->agno]; | |
2292 | args->minleft = 0; | |
2293 | error = xfs_alloc_fix_freelist(args, 0); | |
2294 | args->minleft = minleft; | |
2295 | if (error) { | |
2296 | TRACE_ALLOC("nofix", args); | |
2297 | goto error0; | |
2298 | } | |
2299 | if (!args->agbp) { | |
2300 | up_read(&mp->m_peraglock); | |
2301 | TRACE_ALLOC("noagbp", args); | |
2302 | break; | |
2303 | } | |
2304 | args->agbno = XFS_FSB_TO_AGBNO(mp, args->fsbno); | |
2305 | if ((error = xfs_alloc_ag_vextent(args))) | |
2306 | goto error0; | |
2307 | up_read(&mp->m_peraglock); | |
2308 | break; | |
2309 | case XFS_ALLOCTYPE_START_BNO: | |
2310 | /* | |
2311 | * Try near allocation first, then anywhere-in-ag after | |
2312 | * the first a.g. fails. | |
2313 | */ | |
2314 | if ((args->userdata == XFS_ALLOC_INITIAL_USER_DATA) && | |
2315 | (mp->m_flags & XFS_MOUNT_32BITINODES)) { | |
2316 | args->fsbno = XFS_AGB_TO_FSB(mp, | |
2317 | ((mp->m_agfrotor / rotorstep) % | |
2318 | mp->m_sb.sb_agcount), 0); | |
2319 | bump_rotor = 1; | |
2320 | } | |
2321 | args->agbno = XFS_FSB_TO_AGBNO(mp, args->fsbno); | |
2322 | args->type = XFS_ALLOCTYPE_NEAR_BNO; | |
2323 | /* FALLTHROUGH */ | |
2324 | case XFS_ALLOCTYPE_ANY_AG: | |
2325 | case XFS_ALLOCTYPE_START_AG: | |
2326 | case XFS_ALLOCTYPE_FIRST_AG: | |
2327 | /* | |
2328 | * Rotate through the allocation groups looking for a winner. | |
2329 | */ | |
2330 | if (type == XFS_ALLOCTYPE_ANY_AG) { | |
2331 | /* | |
2332 | * Start with the last place we left off. | |
2333 | */ | |
2334 | args->agno = sagno = (mp->m_agfrotor / rotorstep) % | |
2335 | mp->m_sb.sb_agcount; | |
2336 | args->type = XFS_ALLOCTYPE_THIS_AG; | |
2337 | flags = XFS_ALLOC_FLAG_TRYLOCK; | |
2338 | } else if (type == XFS_ALLOCTYPE_FIRST_AG) { | |
2339 | /* | |
2340 | * Start with allocation group given by bno. | |
2341 | */ | |
2342 | args->agno = XFS_FSB_TO_AGNO(mp, args->fsbno); | |
2343 | args->type = XFS_ALLOCTYPE_THIS_AG; | |
2344 | sagno = 0; | |
2345 | flags = 0; | |
2346 | } else { | |
2347 | if (type == XFS_ALLOCTYPE_START_AG) | |
2348 | args->type = XFS_ALLOCTYPE_THIS_AG; | |
2349 | /* | |
2350 | * Start with the given allocation group. | |
2351 | */ | |
2352 | args->agno = sagno = XFS_FSB_TO_AGNO(mp, args->fsbno); | |
2353 | flags = XFS_ALLOC_FLAG_TRYLOCK; | |
2354 | } | |
2355 | /* | |
2356 | * Loop over allocation groups twice; first time with | |
2357 | * trylock set, second time without. | |
2358 | */ | |
2359 | down_read(&mp->m_peraglock); | |
2360 | for (;;) { | |
2361 | args->pag = &mp->m_perag[args->agno]; | |
2362 | if (no_min) args->minleft = 0; | |
2363 | error = xfs_alloc_fix_freelist(args, flags); | |
2364 | args->minleft = minleft; | |
2365 | if (error) { | |
2366 | TRACE_ALLOC("nofix", args); | |
2367 | goto error0; | |
2368 | } | |
2369 | /* | |
2370 | * If we get a buffer back then the allocation will fly. | |
2371 | */ | |
2372 | if (args->agbp) { | |
2373 | if ((error = xfs_alloc_ag_vextent(args))) | |
2374 | goto error0; | |
2375 | break; | |
2376 | } | |
2377 | TRACE_ALLOC("loopfailed", args); | |
2378 | /* | |
2379 | * Didn't work, figure out the next iteration. | |
2380 | */ | |
2381 | if (args->agno == sagno && | |
2382 | type == XFS_ALLOCTYPE_START_BNO) | |
2383 | args->type = XFS_ALLOCTYPE_THIS_AG; | |
2384 | if (++(args->agno) == mp->m_sb.sb_agcount) | |
2385 | args->agno = 0; | |
2386 | /* | |
2387 | * Reached the starting a.g., must either be done | |
2388 | * or switch to non-trylock mode. | |
2389 | */ | |
2390 | if (args->agno == sagno) { | |
2391 | if (no_min == 1) { | |
2392 | args->agbno = NULLAGBLOCK; | |
2393 | TRACE_ALLOC("allfailed", args); | |
2394 | break; | |
2395 | } | |
2396 | if (flags == 0) { | |
2397 | no_min = 1; | |
2398 | } else { | |
2399 | flags = 0; | |
2400 | if (type == XFS_ALLOCTYPE_START_BNO) { | |
2401 | args->agbno = XFS_FSB_TO_AGBNO(mp, | |
2402 | args->fsbno); | |
2403 | args->type = XFS_ALLOCTYPE_NEAR_BNO; | |
2404 | } | |
2405 | } | |
2406 | } | |
2407 | } | |
2408 | up_read(&mp->m_peraglock); | |
2409 | if (bump_rotor || (type == XFS_ALLOCTYPE_ANY_AG)) { | |
2410 | if (args->agno == sagno) | |
2411 | mp->m_agfrotor = (mp->m_agfrotor + 1) % | |
2412 | (mp->m_sb.sb_agcount * rotorstep); | |
2413 | else | |
2414 | mp->m_agfrotor = (args->agno * rotorstep + 1) % | |
2415 | (mp->m_sb.sb_agcount * rotorstep); | |
2416 | } | |
2417 | break; | |
2418 | default: | |
2419 | ASSERT(0); | |
2420 | /* NOTREACHED */ | |
2421 | } | |
2422 | if (args->agbno == NULLAGBLOCK) | |
2423 | args->fsbno = NULLFSBLOCK; | |
2424 | else { | |
2425 | args->fsbno = XFS_AGB_TO_FSB(mp, args->agno, args->agbno); | |
2426 | #ifdef DEBUG | |
2427 | ASSERT(args->len >= args->minlen); | |
2428 | ASSERT(args->len <= args->maxlen); | |
2429 | ASSERT(args->agbno % args->alignment == 0); | |
2430 | XFS_AG_CHECK_DADDR(mp, XFS_FSB_TO_DADDR(mp, args->fsbno), | |
2431 | args->len); | |
2432 | #endif | |
2433 | } | |
2434 | return 0; | |
2435 | error0: | |
2436 | up_read(&mp->m_peraglock); | |
2437 | return error; | |
2438 | } | |
2439 | ||
2440 | /* | |
2441 | * Free an extent. | |
2442 | * Just break up the extent address and hand off to xfs_free_ag_extent | |
2443 | * after fixing up the freelist. | |
2444 | */ | |
2445 | int /* error */ | |
2446 | xfs_free_extent( | |
2447 | xfs_trans_t *tp, /* transaction pointer */ | |
2448 | xfs_fsblock_t bno, /* starting block number of extent */ | |
2449 | xfs_extlen_t len) /* length of extent */ | |
2450 | { | |
2451 | #ifdef DEBUG | |
2452 | xfs_agf_t *agf; /* a.g. freespace header */ | |
2453 | #endif | |
2454 | xfs_alloc_arg_t args; /* allocation argument structure */ | |
2455 | int error; | |
2456 | ||
2457 | ASSERT(len != 0); | |
2458 | args.tp = tp; | |
2459 | args.mp = tp->t_mountp; | |
2460 | args.agno = XFS_FSB_TO_AGNO(args.mp, bno); | |
2461 | ASSERT(args.agno < args.mp->m_sb.sb_agcount); | |
2462 | args.agbno = XFS_FSB_TO_AGBNO(args.mp, bno); | |
2463 | args.alignment = 1; | |
2464 | args.minlen = args.minleft = args.minalignslop = 0; | |
2465 | down_read(&args.mp->m_peraglock); | |
2466 | args.pag = &args.mp->m_perag[args.agno]; | |
2467 | if ((error = xfs_alloc_fix_freelist(&args, 0))) | |
2468 | goto error0; | |
2469 | #ifdef DEBUG | |
2470 | ASSERT(args.agbp != NULL); | |
2471 | agf = XFS_BUF_TO_AGF(args.agbp); | |
2472 | ASSERT(args.agbno + len <= INT_GET(agf->agf_length, ARCH_CONVERT)); | |
2473 | #endif | |
2474 | error = xfs_free_ag_extent(tp, args.agbp, args.agno, args.agbno, | |
2475 | len, 0); | |
2476 | error0: | |
2477 | up_read(&args.mp->m_peraglock); | |
2478 | return error; | |
2479 | } | |
2480 | ||
2481 | ||
2482 | /* | |
2483 | * AG Busy list management | |
2484 | * The busy list contains block ranges that have been freed but whose | |
2485 | * transacations have not yet hit disk. If any block listed in a busy | |
2486 | * list is reused, the transaction that freed it must be forced to disk | |
2487 | * before continuing to use the block. | |
2488 | * | |
2489 | * xfs_alloc_mark_busy - add to the per-ag busy list | |
2490 | * xfs_alloc_clear_busy - remove an item from the per-ag busy list | |
2491 | */ | |
2492 | void | |
2493 | xfs_alloc_mark_busy(xfs_trans_t *tp, | |
2494 | xfs_agnumber_t agno, | |
2495 | xfs_agblock_t bno, | |
2496 | xfs_extlen_t len) | |
2497 | { | |
2498 | xfs_mount_t *mp; | |
2499 | xfs_perag_busy_t *bsy; | |
2500 | int n; | |
2501 | SPLDECL(s); | |
2502 | ||
2503 | mp = tp->t_mountp; | |
2504 | s = mutex_spinlock(&mp->m_perag[agno].pagb_lock); | |
2505 | ||
2506 | /* search pagb_list for an open slot */ | |
2507 | for (bsy = mp->m_perag[agno].pagb_list, n = 0; | |
2508 | n < XFS_PAGB_NUM_SLOTS; | |
2509 | bsy++, n++) { | |
2510 | if (bsy->busy_tp == NULL) { | |
2511 | break; | |
2512 | } | |
2513 | } | |
2514 | ||
2515 | if (n < XFS_PAGB_NUM_SLOTS) { | |
2516 | bsy = &mp->m_perag[agno].pagb_list[n]; | |
2517 | mp->m_perag[agno].pagb_count++; | |
2518 | TRACE_BUSY("xfs_alloc_mark_busy", "got", agno, bno, len, n, tp); | |
2519 | bsy->busy_start = bno; | |
2520 | bsy->busy_length = len; | |
2521 | bsy->busy_tp = tp; | |
2522 | xfs_trans_add_busy(tp, agno, n); | |
2523 | } else { | |
2524 | TRACE_BUSY("xfs_alloc_mark_busy", "FULL", agno, bno, len, -1, tp); | |
2525 | /* | |
2526 | * The busy list is full! Since it is now not possible to | |
2527 | * track the free block, make this a synchronous transaction | |
2528 | * to insure that the block is not reused before this | |
2529 | * transaction commits. | |
2530 | */ | |
2531 | xfs_trans_set_sync(tp); | |
2532 | } | |
2533 | ||
2534 | mutex_spinunlock(&mp->m_perag[agno].pagb_lock, s); | |
2535 | } | |
2536 | ||
2537 | void | |
2538 | xfs_alloc_clear_busy(xfs_trans_t *tp, | |
2539 | xfs_agnumber_t agno, | |
2540 | int idx) | |
2541 | { | |
2542 | xfs_mount_t *mp; | |
2543 | xfs_perag_busy_t *list; | |
2544 | SPLDECL(s); | |
2545 | ||
2546 | mp = tp->t_mountp; | |
2547 | ||
2548 | s = mutex_spinlock(&mp->m_perag[agno].pagb_lock); | |
2549 | list = mp->m_perag[agno].pagb_list; | |
2550 | ||
2551 | ASSERT(idx < XFS_PAGB_NUM_SLOTS); | |
2552 | if (list[idx].busy_tp == tp) { | |
2553 | TRACE_UNBUSY("xfs_alloc_clear_busy", "found", agno, idx, tp); | |
2554 | list[idx].busy_tp = NULL; | |
2555 | mp->m_perag[agno].pagb_count--; | |
2556 | } else { | |
2557 | TRACE_UNBUSY("xfs_alloc_clear_busy", "missing", agno, idx, tp); | |
2558 | } | |
2559 | ||
2560 | mutex_spinunlock(&mp->m_perag[agno].pagb_lock, s); | |
2561 | } | |
2562 | ||
2563 | ||
2564 | /* | |
2565 | * returns non-zero if any of (agno,bno):len is in a busy list | |
2566 | */ | |
ba0f32d4 | 2567 | STATIC int |
1da177e4 LT |
2568 | xfs_alloc_search_busy(xfs_trans_t *tp, |
2569 | xfs_agnumber_t agno, | |
2570 | xfs_agblock_t bno, | |
2571 | xfs_extlen_t len) | |
2572 | { | |
2573 | xfs_mount_t *mp; | |
2574 | xfs_perag_busy_t *bsy; | |
2575 | int n; | |
2576 | xfs_agblock_t uend, bend; | |
2577 | xfs_lsn_t lsn; | |
2578 | int cnt; | |
2579 | SPLDECL(s); | |
2580 | ||
2581 | mp = tp->t_mountp; | |
2582 | ||
2583 | s = mutex_spinlock(&mp->m_perag[agno].pagb_lock); | |
2584 | cnt = mp->m_perag[agno].pagb_count; | |
2585 | ||
2586 | uend = bno + len - 1; | |
2587 | ||
2588 | /* search pagb_list for this slot, skipping open slots */ | |
2589 | for (bsy = mp->m_perag[agno].pagb_list, n = 0; | |
2590 | cnt; bsy++, n++) { | |
2591 | ||
2592 | /* | |
2593 | * (start1,length1) within (start2, length2) | |
2594 | */ | |
2595 | if (bsy->busy_tp != NULL) { | |
2596 | bend = bsy->busy_start + bsy->busy_length - 1; | |
2597 | if ((bno > bend) || | |
2598 | (uend < bsy->busy_start)) { | |
2599 | cnt--; | |
2600 | } else { | |
2601 | TRACE_BUSYSEARCH("xfs_alloc_search_busy", | |
2602 | "found1", agno, bno, len, n, | |
2603 | tp); | |
2604 | break; | |
2605 | } | |
2606 | } | |
2607 | } | |
2608 | ||
2609 | /* | |
2610 | * If a block was found, force the log through the LSN of the | |
2611 | * transaction that freed the block | |
2612 | */ | |
2613 | if (cnt) { | |
2614 | TRACE_BUSYSEARCH("xfs_alloc_search_busy", "found", agno, bno, len, n, tp); | |
2615 | lsn = bsy->busy_tp->t_commit_lsn; | |
2616 | mutex_spinunlock(&mp->m_perag[agno].pagb_lock, s); | |
2617 | xfs_log_force(mp, lsn, XFS_LOG_FORCE|XFS_LOG_SYNC); | |
2618 | } else { | |
2619 | TRACE_BUSYSEARCH("xfs_alloc_search_busy", "not-found", agno, bno, len, n, tp); | |
2620 | n = -1; | |
2621 | mutex_spinunlock(&mp->m_perag[agno].pagb_lock, s); | |
2622 | } | |
2623 | ||
2624 | return n; | |
2625 | } |