Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
70a9883c | 20 | #include "xfs_format.h" |
239880ef | 21 | #include "xfs_log_format.h" |
70a9883c | 22 | #include "xfs_shared.h" |
239880ef | 23 | #include "xfs_trans_resv.h" |
a844f451 | 24 | #include "xfs_bit.h" |
1da177e4 LT |
25 | #include "xfs_sb.h" |
26 | #include "xfs_ag.h" | |
1da177e4 | 27 | #include "xfs_mount.h" |
a844f451 | 28 | #include "xfs_inode.h" |
1da177e4 | 29 | #include "xfs_btree.h" |
a4fbe6ab | 30 | #include "xfs_alloc_btree.h" |
1da177e4 | 31 | #include "xfs_alloc.h" |
efc27b52 | 32 | #include "xfs_extent_busy.h" |
1da177e4 | 33 | #include "xfs_error.h" |
4e0e6040 | 34 | #include "xfs_cksum.h" |
0b1b213f | 35 | #include "xfs_trace.h" |
239880ef | 36 | #include "xfs_trans.h" |
4e0e6040 | 37 | #include "xfs_buf_item.h" |
239880ef | 38 | #include "xfs_log.h" |
1da177e4 | 39 | |
c999a223 | 40 | struct workqueue_struct *xfs_alloc_wq; |
1da177e4 LT |
41 | |
42 | #define XFS_ABSDIFF(a,b) (((a) <= (b)) ? ((b) - (a)) : ((a) - (b))) | |
43 | ||
44 | #define XFSA_FIXUP_BNO_OK 1 | |
45 | #define XFSA_FIXUP_CNT_OK 2 | |
46 | ||
1da177e4 LT |
47 | STATIC int xfs_alloc_ag_vextent_exact(xfs_alloc_arg_t *); |
48 | STATIC int xfs_alloc_ag_vextent_near(xfs_alloc_arg_t *); | |
49 | STATIC int xfs_alloc_ag_vextent_size(xfs_alloc_arg_t *); | |
50 | STATIC int xfs_alloc_ag_vextent_small(xfs_alloc_arg_t *, | |
e26f0501 | 51 | xfs_btree_cur_t *, xfs_agblock_t *, xfs_extlen_t *, int *); |
1da177e4 | 52 | |
fe033cc8 CH |
53 | /* |
54 | * Lookup the record equal to [bno, len] in the btree given by cur. | |
55 | */ | |
56 | STATIC int /* error */ | |
57 | xfs_alloc_lookup_eq( | |
58 | struct xfs_btree_cur *cur, /* btree cursor */ | |
59 | xfs_agblock_t bno, /* starting block of extent */ | |
60 | xfs_extlen_t len, /* length of extent */ | |
61 | int *stat) /* success/failure */ | |
62 | { | |
63 | cur->bc_rec.a.ar_startblock = bno; | |
64 | cur->bc_rec.a.ar_blockcount = len; | |
65 | return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat); | |
66 | } | |
67 | ||
68 | /* | |
69 | * Lookup the first record greater than or equal to [bno, len] | |
70 | * in the btree given by cur. | |
71 | */ | |
a66d6363 | 72 | int /* error */ |
fe033cc8 CH |
73 | xfs_alloc_lookup_ge( |
74 | struct xfs_btree_cur *cur, /* btree cursor */ | |
75 | xfs_agblock_t bno, /* starting block of extent */ | |
76 | xfs_extlen_t len, /* length of extent */ | |
77 | int *stat) /* success/failure */ | |
78 | { | |
79 | cur->bc_rec.a.ar_startblock = bno; | |
80 | cur->bc_rec.a.ar_blockcount = len; | |
81 | return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat); | |
82 | } | |
83 | ||
84 | /* | |
85 | * Lookup the first record less than or equal to [bno, len] | |
86 | * in the btree given by cur. | |
87 | */ | |
a46db608 | 88 | int /* error */ |
fe033cc8 CH |
89 | xfs_alloc_lookup_le( |
90 | struct xfs_btree_cur *cur, /* btree cursor */ | |
91 | xfs_agblock_t bno, /* starting block of extent */ | |
92 | xfs_extlen_t len, /* length of extent */ | |
93 | int *stat) /* success/failure */ | |
94 | { | |
95 | cur->bc_rec.a.ar_startblock = bno; | |
96 | cur->bc_rec.a.ar_blockcount = len; | |
97 | return xfs_btree_lookup(cur, XFS_LOOKUP_LE, stat); | |
98 | } | |
99 | ||
278d0ca1 CH |
100 | /* |
101 | * Update the record referred to by cur to the value given | |
102 | * by [bno, len]. | |
103 | * This either works (return 0) or gets an EFSCORRUPTED error. | |
104 | */ | |
105 | STATIC int /* error */ | |
106 | xfs_alloc_update( | |
107 | struct xfs_btree_cur *cur, /* btree cursor */ | |
108 | xfs_agblock_t bno, /* starting block of extent */ | |
109 | xfs_extlen_t len) /* length of extent */ | |
110 | { | |
111 | union xfs_btree_rec rec; | |
112 | ||
113 | rec.alloc.ar_startblock = cpu_to_be32(bno); | |
114 | rec.alloc.ar_blockcount = cpu_to_be32(len); | |
115 | return xfs_btree_update(cur, &rec); | |
116 | } | |
fe033cc8 | 117 | |
8cc938fe CH |
118 | /* |
119 | * Get the data from the pointed-to record. | |
120 | */ | |
a46db608 | 121 | int /* error */ |
8cc938fe CH |
122 | xfs_alloc_get_rec( |
123 | struct xfs_btree_cur *cur, /* btree cursor */ | |
124 | xfs_agblock_t *bno, /* output: starting block of extent */ | |
125 | xfs_extlen_t *len, /* output: length of extent */ | |
126 | int *stat) /* output: success/failure */ | |
127 | { | |
128 | union xfs_btree_rec *rec; | |
129 | int error; | |
130 | ||
131 | error = xfs_btree_get_rec(cur, &rec, stat); | |
132 | if (!error && *stat == 1) { | |
133 | *bno = be32_to_cpu(rec->alloc.ar_startblock); | |
134 | *len = be32_to_cpu(rec->alloc.ar_blockcount); | |
135 | } | |
136 | return error; | |
137 | } | |
138 | ||
1da177e4 LT |
139 | /* |
140 | * Compute aligned version of the found extent. | |
141 | * Takes alignment and min length into account. | |
142 | */ | |
12375c82 | 143 | STATIC void |
1da177e4 | 144 | xfs_alloc_compute_aligned( |
86fa8af6 | 145 | xfs_alloc_arg_t *args, /* allocation argument structure */ |
1da177e4 LT |
146 | xfs_agblock_t foundbno, /* starting block in found extent */ |
147 | xfs_extlen_t foundlen, /* length in found extent */ | |
1da177e4 LT |
148 | xfs_agblock_t *resbno, /* result block number */ |
149 | xfs_extlen_t *reslen) /* result length */ | |
150 | { | |
151 | xfs_agblock_t bno; | |
1da177e4 LT |
152 | xfs_extlen_t len; |
153 | ||
e26f0501 | 154 | /* Trim busy sections out of found extent */ |
4ecbfe63 | 155 | xfs_extent_busy_trim(args, foundbno, foundlen, &bno, &len); |
e26f0501 CH |
156 | |
157 | if (args->alignment > 1 && len >= args->minlen) { | |
158 | xfs_agblock_t aligned_bno = roundup(bno, args->alignment); | |
159 | xfs_extlen_t diff = aligned_bno - bno; | |
160 | ||
161 | *resbno = aligned_bno; | |
162 | *reslen = diff >= len ? 0 : len - diff; | |
1da177e4 | 163 | } else { |
e26f0501 CH |
164 | *resbno = bno; |
165 | *reslen = len; | |
1da177e4 | 166 | } |
1da177e4 LT |
167 | } |
168 | ||
169 | /* | |
170 | * Compute best start block and diff for "near" allocations. | |
171 | * freelen >= wantlen already checked by caller. | |
172 | */ | |
173 | STATIC xfs_extlen_t /* difference value (absolute) */ | |
174 | xfs_alloc_compute_diff( | |
175 | xfs_agblock_t wantbno, /* target starting block */ | |
176 | xfs_extlen_t wantlen, /* target length */ | |
177 | xfs_extlen_t alignment, /* target alignment */ | |
211d022c | 178 | char userdata, /* are we allocating data? */ |
1da177e4 LT |
179 | xfs_agblock_t freebno, /* freespace's starting block */ |
180 | xfs_extlen_t freelen, /* freespace's length */ | |
181 | xfs_agblock_t *newbnop) /* result: best start block from free */ | |
182 | { | |
183 | xfs_agblock_t freeend; /* end of freespace extent */ | |
184 | xfs_agblock_t newbno1; /* return block number */ | |
185 | xfs_agblock_t newbno2; /* other new block number */ | |
186 | xfs_extlen_t newlen1=0; /* length with newbno1 */ | |
187 | xfs_extlen_t newlen2=0; /* length with newbno2 */ | |
188 | xfs_agblock_t wantend; /* end of target extent */ | |
189 | ||
190 | ASSERT(freelen >= wantlen); | |
191 | freeend = freebno + freelen; | |
192 | wantend = wantbno + wantlen; | |
211d022c JK |
193 | /* |
194 | * We want to allocate from the start of a free extent if it is past | |
195 | * the desired block or if we are allocating user data and the free | |
196 | * extent is before desired block. The second case is there to allow | |
197 | * for contiguous allocation from the remaining free space if the file | |
198 | * grows in the short term. | |
199 | */ | |
200 | if (freebno >= wantbno || (userdata && freeend < wantend)) { | |
1da177e4 LT |
201 | if ((newbno1 = roundup(freebno, alignment)) >= freeend) |
202 | newbno1 = NULLAGBLOCK; | |
203 | } else if (freeend >= wantend && alignment > 1) { | |
204 | newbno1 = roundup(wantbno, alignment); | |
205 | newbno2 = newbno1 - alignment; | |
206 | if (newbno1 >= freeend) | |
207 | newbno1 = NULLAGBLOCK; | |
208 | else | |
209 | newlen1 = XFS_EXTLEN_MIN(wantlen, freeend - newbno1); | |
210 | if (newbno2 < freebno) | |
211 | newbno2 = NULLAGBLOCK; | |
212 | else | |
213 | newlen2 = XFS_EXTLEN_MIN(wantlen, freeend - newbno2); | |
214 | if (newbno1 != NULLAGBLOCK && newbno2 != NULLAGBLOCK) { | |
215 | if (newlen1 < newlen2 || | |
216 | (newlen1 == newlen2 && | |
217 | XFS_ABSDIFF(newbno1, wantbno) > | |
218 | XFS_ABSDIFF(newbno2, wantbno))) | |
219 | newbno1 = newbno2; | |
220 | } else if (newbno2 != NULLAGBLOCK) | |
221 | newbno1 = newbno2; | |
222 | } else if (freeend >= wantend) { | |
223 | newbno1 = wantbno; | |
224 | } else if (alignment > 1) { | |
225 | newbno1 = roundup(freeend - wantlen, alignment); | |
226 | if (newbno1 > freeend - wantlen && | |
227 | newbno1 - alignment >= freebno) | |
228 | newbno1 -= alignment; | |
229 | else if (newbno1 >= freeend) | |
230 | newbno1 = NULLAGBLOCK; | |
231 | } else | |
232 | newbno1 = freeend - wantlen; | |
233 | *newbnop = newbno1; | |
234 | return newbno1 == NULLAGBLOCK ? 0 : XFS_ABSDIFF(newbno1, wantbno); | |
235 | } | |
236 | ||
237 | /* | |
238 | * Fix up the length, based on mod and prod. | |
239 | * len should be k * prod + mod for some k. | |
240 | * If len is too small it is returned unchanged. | |
241 | * If len hits maxlen it is left alone. | |
242 | */ | |
243 | STATIC void | |
244 | xfs_alloc_fix_len( | |
245 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
246 | { | |
247 | xfs_extlen_t k; | |
248 | xfs_extlen_t rlen; | |
249 | ||
250 | ASSERT(args->mod < args->prod); | |
251 | rlen = args->len; | |
252 | ASSERT(rlen >= args->minlen); | |
253 | ASSERT(rlen <= args->maxlen); | |
254 | if (args->prod <= 1 || rlen < args->mod || rlen == args->maxlen || | |
255 | (args->mod == 0 && rlen < args->prod)) | |
256 | return; | |
257 | k = rlen % args->prod; | |
258 | if (k == args->mod) | |
259 | return; | |
260 | if (k > args->mod) { | |
261 | if ((int)(rlen = rlen - k - args->mod) < (int)args->minlen) | |
262 | return; | |
263 | } else { | |
264 | if ((int)(rlen = rlen - args->prod - (args->mod - k)) < | |
265 | (int)args->minlen) | |
266 | return; | |
267 | } | |
268 | ASSERT(rlen >= args->minlen); | |
269 | ASSERT(rlen <= args->maxlen); | |
270 | args->len = rlen; | |
271 | } | |
272 | ||
273 | /* | |
274 | * Fix up length if there is too little space left in the a.g. | |
275 | * Return 1 if ok, 0 if too little, should give up. | |
276 | */ | |
277 | STATIC int | |
278 | xfs_alloc_fix_minleft( | |
279 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
280 | { | |
281 | xfs_agf_t *agf; /* a.g. freelist header */ | |
282 | int diff; /* free space difference */ | |
283 | ||
284 | if (args->minleft == 0) | |
285 | return 1; | |
286 | agf = XFS_BUF_TO_AGF(args->agbp); | |
16259e7d | 287 | diff = be32_to_cpu(agf->agf_freeblks) |
1da177e4 LT |
288 | - args->len - args->minleft; |
289 | if (diff >= 0) | |
290 | return 1; | |
291 | args->len += diff; /* shrink the allocated space */ | |
292 | if (args->len >= args->minlen) | |
293 | return 1; | |
294 | args->agbno = NULLAGBLOCK; | |
295 | return 0; | |
296 | } | |
297 | ||
298 | /* | |
299 | * Update the two btrees, logically removing from freespace the extent | |
300 | * starting at rbno, rlen blocks. The extent is contained within the | |
301 | * actual (current) free extent fbno for flen blocks. | |
302 | * Flags are passed in indicating whether the cursors are set to the | |
303 | * relevant records. | |
304 | */ | |
305 | STATIC int /* error code */ | |
306 | xfs_alloc_fixup_trees( | |
307 | xfs_btree_cur_t *cnt_cur, /* cursor for by-size btree */ | |
308 | xfs_btree_cur_t *bno_cur, /* cursor for by-block btree */ | |
309 | xfs_agblock_t fbno, /* starting block of free extent */ | |
310 | xfs_extlen_t flen, /* length of free extent */ | |
311 | xfs_agblock_t rbno, /* starting block of returned extent */ | |
312 | xfs_extlen_t rlen, /* length of returned extent */ | |
313 | int flags) /* flags, XFSA_FIXUP_... */ | |
314 | { | |
315 | int error; /* error code */ | |
316 | int i; /* operation results */ | |
317 | xfs_agblock_t nfbno1; /* first new free startblock */ | |
318 | xfs_agblock_t nfbno2; /* second new free startblock */ | |
319 | xfs_extlen_t nflen1=0; /* first new free length */ | |
320 | xfs_extlen_t nflen2=0; /* second new free length */ | |
321 | ||
322 | /* | |
323 | * Look up the record in the by-size tree if necessary. | |
324 | */ | |
325 | if (flags & XFSA_FIXUP_CNT_OK) { | |
326 | #ifdef DEBUG | |
327 | if ((error = xfs_alloc_get_rec(cnt_cur, &nfbno1, &nflen1, &i))) | |
328 | return error; | |
329 | XFS_WANT_CORRUPTED_RETURN( | |
330 | i == 1 && nfbno1 == fbno && nflen1 == flen); | |
331 | #endif | |
332 | } else { | |
333 | if ((error = xfs_alloc_lookup_eq(cnt_cur, fbno, flen, &i))) | |
334 | return error; | |
335 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
336 | } | |
337 | /* | |
338 | * Look up the record in the by-block tree if necessary. | |
339 | */ | |
340 | if (flags & XFSA_FIXUP_BNO_OK) { | |
341 | #ifdef DEBUG | |
342 | if ((error = xfs_alloc_get_rec(bno_cur, &nfbno1, &nflen1, &i))) | |
343 | return error; | |
344 | XFS_WANT_CORRUPTED_RETURN( | |
345 | i == 1 && nfbno1 == fbno && nflen1 == flen); | |
346 | #endif | |
347 | } else { | |
348 | if ((error = xfs_alloc_lookup_eq(bno_cur, fbno, flen, &i))) | |
349 | return error; | |
350 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
351 | } | |
7cc95a82 | 352 | |
1da177e4 | 353 | #ifdef DEBUG |
7cc95a82 CH |
354 | if (bno_cur->bc_nlevels == 1 && cnt_cur->bc_nlevels == 1) { |
355 | struct xfs_btree_block *bnoblock; | |
356 | struct xfs_btree_block *cntblock; | |
357 | ||
358 | bnoblock = XFS_BUF_TO_BLOCK(bno_cur->bc_bufs[0]); | |
359 | cntblock = XFS_BUF_TO_BLOCK(cnt_cur->bc_bufs[0]); | |
1da177e4 | 360 | |
7cc95a82 CH |
361 | XFS_WANT_CORRUPTED_RETURN( |
362 | bnoblock->bb_numrecs == cntblock->bb_numrecs); | |
1da177e4 LT |
363 | } |
364 | #endif | |
7cc95a82 | 365 | |
1da177e4 LT |
366 | /* |
367 | * Deal with all four cases: the allocated record is contained | |
368 | * within the freespace record, so we can have new freespace | |
369 | * at either (or both) end, or no freespace remaining. | |
370 | */ | |
371 | if (rbno == fbno && rlen == flen) | |
372 | nfbno1 = nfbno2 = NULLAGBLOCK; | |
373 | else if (rbno == fbno) { | |
374 | nfbno1 = rbno + rlen; | |
375 | nflen1 = flen - rlen; | |
376 | nfbno2 = NULLAGBLOCK; | |
377 | } else if (rbno + rlen == fbno + flen) { | |
378 | nfbno1 = fbno; | |
379 | nflen1 = flen - rlen; | |
380 | nfbno2 = NULLAGBLOCK; | |
381 | } else { | |
382 | nfbno1 = fbno; | |
383 | nflen1 = rbno - fbno; | |
384 | nfbno2 = rbno + rlen; | |
385 | nflen2 = (fbno + flen) - nfbno2; | |
386 | } | |
387 | /* | |
388 | * Delete the entry from the by-size btree. | |
389 | */ | |
91cca5df | 390 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
1da177e4 LT |
391 | return error; |
392 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
393 | /* | |
394 | * Add new by-size btree entry(s). | |
395 | */ | |
396 | if (nfbno1 != NULLAGBLOCK) { | |
397 | if ((error = xfs_alloc_lookup_eq(cnt_cur, nfbno1, nflen1, &i))) | |
398 | return error; | |
399 | XFS_WANT_CORRUPTED_RETURN(i == 0); | |
4b22a571 | 400 | if ((error = xfs_btree_insert(cnt_cur, &i))) |
1da177e4 LT |
401 | return error; |
402 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
403 | } | |
404 | if (nfbno2 != NULLAGBLOCK) { | |
405 | if ((error = xfs_alloc_lookup_eq(cnt_cur, nfbno2, nflen2, &i))) | |
406 | return error; | |
407 | XFS_WANT_CORRUPTED_RETURN(i == 0); | |
4b22a571 | 408 | if ((error = xfs_btree_insert(cnt_cur, &i))) |
1da177e4 LT |
409 | return error; |
410 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
411 | } | |
412 | /* | |
413 | * Fix up the by-block btree entry(s). | |
414 | */ | |
415 | if (nfbno1 == NULLAGBLOCK) { | |
416 | /* | |
417 | * No remaining freespace, just delete the by-block tree entry. | |
418 | */ | |
91cca5df | 419 | if ((error = xfs_btree_delete(bno_cur, &i))) |
1da177e4 LT |
420 | return error; |
421 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
422 | } else { | |
423 | /* | |
424 | * Update the by-block entry to start later|be shorter. | |
425 | */ | |
426 | if ((error = xfs_alloc_update(bno_cur, nfbno1, nflen1))) | |
427 | return error; | |
428 | } | |
429 | if (nfbno2 != NULLAGBLOCK) { | |
430 | /* | |
431 | * 2 resulting free entries, need to add one. | |
432 | */ | |
433 | if ((error = xfs_alloc_lookup_eq(bno_cur, nfbno2, nflen2, &i))) | |
434 | return error; | |
435 | XFS_WANT_CORRUPTED_RETURN(i == 0); | |
4b22a571 | 436 | if ((error = xfs_btree_insert(bno_cur, &i))) |
1da177e4 LT |
437 | return error; |
438 | XFS_WANT_CORRUPTED_RETURN(i == 1); | |
439 | } | |
440 | return 0; | |
441 | } | |
442 | ||
77c95bba | 443 | static bool |
612cfbfe | 444 | xfs_agfl_verify( |
bb80c6d7 DC |
445 | struct xfs_buf *bp) |
446 | { | |
bb80c6d7 DC |
447 | struct xfs_mount *mp = bp->b_target->bt_mount; |
448 | struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp); | |
bb80c6d7 DC |
449 | int i; |
450 | ||
77c95bba CH |
451 | if (!uuid_equal(&agfl->agfl_uuid, &mp->m_sb.sb_uuid)) |
452 | return false; | |
453 | if (be32_to_cpu(agfl->agfl_magicnum) != XFS_AGFL_MAGIC) | |
454 | return false; | |
455 | /* | |
456 | * during growfs operations, the perag is not fully initialised, | |
457 | * so we can't use it for any useful checking. growfs ensures we can't | |
458 | * use it by using uncached buffers that don't have the perag attached | |
459 | * so we can detect and avoid this problem. | |
460 | */ | |
461 | if (bp->b_pag && be32_to_cpu(agfl->agfl_seqno) != bp->b_pag->pag_agno) | |
462 | return false; | |
463 | ||
bb80c6d7 | 464 | for (i = 0; i < XFS_AGFL_SIZE(mp); i++) { |
77c95bba | 465 | if (be32_to_cpu(agfl->agfl_bno[i]) != NULLAGBLOCK && |
bb80c6d7 | 466 | be32_to_cpu(agfl->agfl_bno[i]) >= mp->m_sb.sb_agblocks) |
77c95bba | 467 | return false; |
bb80c6d7 | 468 | } |
77c95bba CH |
469 | return true; |
470 | } | |
471 | ||
472 | static void | |
473 | xfs_agfl_read_verify( | |
474 | struct xfs_buf *bp) | |
475 | { | |
476 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
477 | int agfl_ok = 1; | |
478 | ||
479 | /* | |
480 | * There is no verification of non-crc AGFLs because mkfs does not | |
481 | * initialise the AGFL to zero or NULL. Hence the only valid part of the | |
482 | * AGFL is what the AGF says is active. We can't get to the AGF, so we | |
483 | * can't verify just those entries are valid. | |
484 | */ | |
485 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
486 | return; | |
487 | ||
488 | agfl_ok = xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length), | |
489 | offsetof(struct xfs_agfl, agfl_crc)); | |
490 | ||
491 | agfl_ok = agfl_ok && xfs_agfl_verify(bp); | |
bb80c6d7 DC |
492 | |
493 | if (!agfl_ok) { | |
77c95bba | 494 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); |
bb80c6d7 DC |
495 | xfs_buf_ioerror(bp, EFSCORRUPTED); |
496 | } | |
612cfbfe DC |
497 | } |
498 | ||
1813dd64 | 499 | static void |
612cfbfe DC |
500 | xfs_agfl_write_verify( |
501 | struct xfs_buf *bp) | |
502 | { | |
77c95bba CH |
503 | struct xfs_mount *mp = bp->b_target->bt_mount; |
504 | struct xfs_buf_log_item *bip = bp->b_fspriv; | |
612cfbfe | 505 | |
77c95bba CH |
506 | /* no verification of non-crc AGFLs */ |
507 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
508 | return; | |
509 | ||
510 | if (!xfs_agfl_verify(bp)) { | |
511 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); | |
512 | xfs_buf_ioerror(bp, EFSCORRUPTED); | |
513 | return; | |
514 | } | |
515 | ||
516 | if (bip) | |
517 | XFS_BUF_TO_AGFL(bp)->agfl_lsn = cpu_to_be64(bip->bli_item.li_lsn); | |
518 | ||
519 | xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), | |
520 | offsetof(struct xfs_agfl, agfl_crc)); | |
bb80c6d7 DC |
521 | } |
522 | ||
1813dd64 DC |
523 | const struct xfs_buf_ops xfs_agfl_buf_ops = { |
524 | .verify_read = xfs_agfl_read_verify, | |
525 | .verify_write = xfs_agfl_write_verify, | |
526 | }; | |
527 | ||
1da177e4 LT |
528 | /* |
529 | * Read in the allocation group free block array. | |
530 | */ | |
531 | STATIC int /* error */ | |
532 | xfs_alloc_read_agfl( | |
533 | xfs_mount_t *mp, /* mount point structure */ | |
534 | xfs_trans_t *tp, /* transaction pointer */ | |
535 | xfs_agnumber_t agno, /* allocation group number */ | |
536 | xfs_buf_t **bpp) /* buffer for the ag free block array */ | |
537 | { | |
538 | xfs_buf_t *bp; /* return value */ | |
539 | int error; | |
540 | ||
541 | ASSERT(agno != NULLAGNUMBER); | |
542 | error = xfs_trans_read_buf( | |
543 | mp, tp, mp->m_ddev_targp, | |
544 | XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)), | |
1813dd64 | 545 | XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_agfl_buf_ops); |
1da177e4 LT |
546 | if (error) |
547 | return error; | |
5a52c2a5 | 548 | ASSERT(!xfs_buf_geterror(bp)); |
38f23232 | 549 | xfs_buf_set_ref(bp, XFS_AGFL_REF); |
1da177e4 LT |
550 | *bpp = bp; |
551 | return 0; | |
552 | } | |
553 | ||
ecb6928f CH |
554 | STATIC int |
555 | xfs_alloc_update_counters( | |
556 | struct xfs_trans *tp, | |
557 | struct xfs_perag *pag, | |
558 | struct xfs_buf *agbp, | |
559 | long len) | |
560 | { | |
561 | struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); | |
562 | ||
563 | pag->pagf_freeblks += len; | |
564 | be32_add_cpu(&agf->agf_freeblks, len); | |
565 | ||
566 | xfs_trans_agblocks_delta(tp, len); | |
567 | if (unlikely(be32_to_cpu(agf->agf_freeblks) > | |
568 | be32_to_cpu(agf->agf_length))) | |
569 | return EFSCORRUPTED; | |
570 | ||
571 | xfs_alloc_log_agf(tp, agbp, XFS_AGF_FREEBLKS); | |
572 | return 0; | |
573 | } | |
574 | ||
1da177e4 LT |
575 | /* |
576 | * Allocation group level functions. | |
577 | */ | |
578 | ||
579 | /* | |
580 | * Allocate a variable extent in the allocation group agno. | |
581 | * Type and bno are used to determine where in the allocation group the | |
582 | * extent will start. | |
583 | * Extent's length (returned in *len) will be between minlen and maxlen, | |
584 | * and of the form k * prod + mod unless there's nothing that large. | |
585 | * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. | |
586 | */ | |
587 | STATIC int /* error */ | |
588 | xfs_alloc_ag_vextent( | |
589 | xfs_alloc_arg_t *args) /* argument structure for allocation */ | |
590 | { | |
591 | int error=0; | |
1da177e4 LT |
592 | |
593 | ASSERT(args->minlen > 0); | |
594 | ASSERT(args->maxlen > 0); | |
595 | ASSERT(args->minlen <= args->maxlen); | |
596 | ASSERT(args->mod < args->prod); | |
597 | ASSERT(args->alignment > 0); | |
598 | /* | |
599 | * Branch to correct routine based on the type. | |
600 | */ | |
601 | args->wasfromfl = 0; | |
602 | switch (args->type) { | |
603 | case XFS_ALLOCTYPE_THIS_AG: | |
604 | error = xfs_alloc_ag_vextent_size(args); | |
605 | break; | |
606 | case XFS_ALLOCTYPE_NEAR_BNO: | |
607 | error = xfs_alloc_ag_vextent_near(args); | |
608 | break; | |
609 | case XFS_ALLOCTYPE_THIS_BNO: | |
610 | error = xfs_alloc_ag_vextent_exact(args); | |
611 | break; | |
612 | default: | |
613 | ASSERT(0); | |
614 | /* NOTREACHED */ | |
615 | } | |
ecb6928f CH |
616 | |
617 | if (error || args->agbno == NULLAGBLOCK) | |
1da177e4 | 618 | return error; |
ecb6928f CH |
619 | |
620 | ASSERT(args->len >= args->minlen); | |
621 | ASSERT(args->len <= args->maxlen); | |
622 | ASSERT(!args->wasfromfl || !args->isfl); | |
623 | ASSERT(args->agbno % args->alignment == 0); | |
624 | ||
625 | if (!args->wasfromfl) { | |
626 | error = xfs_alloc_update_counters(args->tp, args->pag, | |
627 | args->agbp, | |
628 | -((long)(args->len))); | |
629 | if (error) | |
630 | return error; | |
631 | ||
4ecbfe63 | 632 | ASSERT(!xfs_extent_busy_search(args->mp, args->agno, |
e26f0501 | 633 | args->agbno, args->len)); |
1da177e4 | 634 | } |
ecb6928f CH |
635 | |
636 | if (!args->isfl) { | |
637 | xfs_trans_mod_sb(args->tp, args->wasdel ? | |
638 | XFS_TRANS_SB_RES_FDBLOCKS : | |
639 | XFS_TRANS_SB_FDBLOCKS, | |
640 | -((long)(args->len))); | |
641 | } | |
642 | ||
643 | XFS_STATS_INC(xs_allocx); | |
644 | XFS_STATS_ADD(xs_allocb, args->len); | |
645 | return error; | |
1da177e4 LT |
646 | } |
647 | ||
648 | /* | |
649 | * Allocate a variable extent at exactly agno/bno. | |
650 | * Extent's length (returned in *len) will be between minlen and maxlen, | |
651 | * and of the form k * prod + mod unless there's nothing that large. | |
652 | * Return the starting a.g. block (bno), or NULLAGBLOCK if we can't do it. | |
653 | */ | |
654 | STATIC int /* error */ | |
655 | xfs_alloc_ag_vextent_exact( | |
656 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
657 | { | |
658 | xfs_btree_cur_t *bno_cur;/* by block-number btree cursor */ | |
659 | xfs_btree_cur_t *cnt_cur;/* by count btree cursor */ | |
1da177e4 LT |
660 | int error; |
661 | xfs_agblock_t fbno; /* start block of found extent */ | |
1da177e4 | 662 | xfs_extlen_t flen; /* length of found extent */ |
e26f0501 CH |
663 | xfs_agblock_t tbno; /* start block of trimmed extent */ |
664 | xfs_extlen_t tlen; /* length of trimmed extent */ | |
665 | xfs_agblock_t tend; /* end block of trimmed extent */ | |
1da177e4 | 666 | int i; /* success/failure of operation */ |
1da177e4 LT |
667 | |
668 | ASSERT(args->alignment == 1); | |
9f9baab3 | 669 | |
1da177e4 LT |
670 | /* |
671 | * Allocate/initialize a cursor for the by-number freespace btree. | |
672 | */ | |
561f7d17 | 673 | bno_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
9f9baab3 CH |
674 | args->agno, XFS_BTNUM_BNO); |
675 | ||
1da177e4 LT |
676 | /* |
677 | * Lookup bno and minlen in the btree (minlen is irrelevant, really). | |
678 | * Look for the closest free block <= bno, it must contain bno | |
679 | * if any free block does. | |
680 | */ | |
9f9baab3 CH |
681 | error = xfs_alloc_lookup_le(bno_cur, args->agbno, args->minlen, &i); |
682 | if (error) | |
1da177e4 | 683 | goto error0; |
9f9baab3 CH |
684 | if (!i) |
685 | goto not_found; | |
686 | ||
1da177e4 LT |
687 | /* |
688 | * Grab the freespace record. | |
689 | */ | |
9f9baab3 CH |
690 | error = xfs_alloc_get_rec(bno_cur, &fbno, &flen, &i); |
691 | if (error) | |
1da177e4 LT |
692 | goto error0; |
693 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
694 | ASSERT(fbno <= args->agbno); | |
9f9baab3 | 695 | |
1da177e4 | 696 | /* |
e26f0501 | 697 | * Check for overlapping busy extents. |
1da177e4 | 698 | */ |
4ecbfe63 | 699 | xfs_extent_busy_trim(args, fbno, flen, &tbno, &tlen); |
e26f0501 CH |
700 | |
701 | /* | |
702 | * Give up if the start of the extent is busy, or the freespace isn't | |
703 | * long enough for the minimum request. | |
704 | */ | |
705 | if (tbno > args->agbno) | |
706 | goto not_found; | |
707 | if (tlen < args->minlen) | |
708 | goto not_found; | |
709 | tend = tbno + tlen; | |
710 | if (tend < args->agbno + args->minlen) | |
9f9baab3 CH |
711 | goto not_found; |
712 | ||
1da177e4 LT |
713 | /* |
714 | * End of extent will be smaller of the freespace end and the | |
715 | * maximal requested end. | |
9f9baab3 | 716 | * |
1da177e4 LT |
717 | * Fix the length according to mod and prod if given. |
718 | */ | |
81463b1c CS |
719 | args->len = XFS_AGBLOCK_MIN(tend, args->agbno + args->maxlen) |
720 | - args->agbno; | |
1da177e4 | 721 | xfs_alloc_fix_len(args); |
9f9baab3 CH |
722 | if (!xfs_alloc_fix_minleft(args)) |
723 | goto not_found; | |
724 | ||
81463b1c | 725 | ASSERT(args->agbno + args->len <= tend); |
9f9baab3 | 726 | |
1da177e4 | 727 | /* |
81463b1c | 728 | * We are allocating agbno for args->len |
1da177e4 LT |
729 | * Allocate/initialize a cursor for the by-size btree. |
730 | */ | |
561f7d17 CH |
731 | cnt_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
732 | args->agno, XFS_BTNUM_CNT); | |
1da177e4 | 733 | ASSERT(args->agbno + args->len <= |
16259e7d | 734 | be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length)); |
9f9baab3 CH |
735 | error = xfs_alloc_fixup_trees(cnt_cur, bno_cur, fbno, flen, args->agbno, |
736 | args->len, XFSA_FIXUP_BNO_OK); | |
737 | if (error) { | |
1da177e4 LT |
738 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); |
739 | goto error0; | |
740 | } | |
9f9baab3 | 741 | |
1da177e4 LT |
742 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); |
743 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
0b1b213f | 744 | |
1da177e4 | 745 | args->wasfromfl = 0; |
9f9baab3 CH |
746 | trace_xfs_alloc_exact_done(args); |
747 | return 0; | |
748 | ||
749 | not_found: | |
750 | /* Didn't find it, return null. */ | |
751 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
752 | args->agbno = NULLAGBLOCK; | |
753 | trace_xfs_alloc_exact_notfound(args); | |
1da177e4 LT |
754 | return 0; |
755 | ||
756 | error0: | |
757 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); | |
0b1b213f | 758 | trace_xfs_alloc_exact_error(args); |
1da177e4 LT |
759 | return error; |
760 | } | |
761 | ||
489a150f CH |
762 | /* |
763 | * Search the btree in a given direction via the search cursor and compare | |
764 | * the records found against the good extent we've already found. | |
765 | */ | |
766 | STATIC int | |
767 | xfs_alloc_find_best_extent( | |
768 | struct xfs_alloc_arg *args, /* allocation argument structure */ | |
769 | struct xfs_btree_cur **gcur, /* good cursor */ | |
770 | struct xfs_btree_cur **scur, /* searching cursor */ | |
771 | xfs_agblock_t gdiff, /* difference for search comparison */ | |
772 | xfs_agblock_t *sbno, /* extent found by search */ | |
e26f0501 CH |
773 | xfs_extlen_t *slen, /* extent length */ |
774 | xfs_agblock_t *sbnoa, /* aligned extent found by search */ | |
775 | xfs_extlen_t *slena, /* aligned extent length */ | |
489a150f CH |
776 | int dir) /* 0 = search right, 1 = search left */ |
777 | { | |
489a150f CH |
778 | xfs_agblock_t new; |
779 | xfs_agblock_t sdiff; | |
780 | int error; | |
781 | int i; | |
782 | ||
783 | /* The good extent is perfect, no need to search. */ | |
784 | if (!gdiff) | |
785 | goto out_use_good; | |
786 | ||
787 | /* | |
788 | * Look until we find a better one, run out of space or run off the end. | |
789 | */ | |
790 | do { | |
791 | error = xfs_alloc_get_rec(*scur, sbno, slen, &i); | |
792 | if (error) | |
793 | goto error0; | |
794 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
e26f0501 | 795 | xfs_alloc_compute_aligned(args, *sbno, *slen, sbnoa, slena); |
489a150f CH |
796 | |
797 | /* | |
798 | * The good extent is closer than this one. | |
799 | */ | |
800 | if (!dir) { | |
e26f0501 | 801 | if (*sbnoa >= args->agbno + gdiff) |
489a150f CH |
802 | goto out_use_good; |
803 | } else { | |
e26f0501 | 804 | if (*sbnoa <= args->agbno - gdiff) |
489a150f CH |
805 | goto out_use_good; |
806 | } | |
807 | ||
808 | /* | |
809 | * Same distance, compare length and pick the best. | |
810 | */ | |
811 | if (*slena >= args->minlen) { | |
812 | args->len = XFS_EXTLEN_MIN(*slena, args->maxlen); | |
813 | xfs_alloc_fix_len(args); | |
814 | ||
815 | sdiff = xfs_alloc_compute_diff(args->agbno, args->len, | |
211d022c JK |
816 | args->alignment, |
817 | args->userdata, *sbnoa, | |
e26f0501 | 818 | *slena, &new); |
489a150f CH |
819 | |
820 | /* | |
821 | * Choose closer size and invalidate other cursor. | |
822 | */ | |
823 | if (sdiff < gdiff) | |
824 | goto out_use_search; | |
825 | goto out_use_good; | |
826 | } | |
827 | ||
828 | if (!dir) | |
829 | error = xfs_btree_increment(*scur, 0, &i); | |
830 | else | |
831 | error = xfs_btree_decrement(*scur, 0, &i); | |
832 | if (error) | |
833 | goto error0; | |
834 | } while (i); | |
835 | ||
836 | out_use_good: | |
837 | xfs_btree_del_cursor(*scur, XFS_BTREE_NOERROR); | |
838 | *scur = NULL; | |
839 | return 0; | |
840 | ||
841 | out_use_search: | |
842 | xfs_btree_del_cursor(*gcur, XFS_BTREE_NOERROR); | |
843 | *gcur = NULL; | |
844 | return 0; | |
845 | ||
846 | error0: | |
847 | /* caller invalidates cursors */ | |
848 | return error; | |
849 | } | |
850 | ||
1da177e4 LT |
851 | /* |
852 | * Allocate a variable extent near bno in the allocation group agno. | |
853 | * Extent's length (returned in len) will be between minlen and maxlen, | |
854 | * and of the form k * prod + mod unless there's nothing that large. | |
855 | * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. | |
856 | */ | |
857 | STATIC int /* error */ | |
858 | xfs_alloc_ag_vextent_near( | |
859 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
860 | { | |
861 | xfs_btree_cur_t *bno_cur_gt; /* cursor for bno btree, right side */ | |
862 | xfs_btree_cur_t *bno_cur_lt; /* cursor for bno btree, left side */ | |
863 | xfs_btree_cur_t *cnt_cur; /* cursor for count btree */ | |
1da177e4 LT |
864 | xfs_agblock_t gtbno; /* start bno of right side entry */ |
865 | xfs_agblock_t gtbnoa; /* aligned ... */ | |
866 | xfs_extlen_t gtdiff; /* difference to right side entry */ | |
867 | xfs_extlen_t gtlen; /* length of right side entry */ | |
e26f0501 | 868 | xfs_extlen_t gtlena; /* aligned ... */ |
1da177e4 LT |
869 | xfs_agblock_t gtnew; /* useful start bno of right side */ |
870 | int error; /* error code */ | |
871 | int i; /* result code, temporary */ | |
872 | int j; /* result code, temporary */ | |
873 | xfs_agblock_t ltbno; /* start bno of left side entry */ | |
874 | xfs_agblock_t ltbnoa; /* aligned ... */ | |
875 | xfs_extlen_t ltdiff; /* difference to left side entry */ | |
1da177e4 | 876 | xfs_extlen_t ltlen; /* length of left side entry */ |
e26f0501 | 877 | xfs_extlen_t ltlena; /* aligned ... */ |
1da177e4 LT |
878 | xfs_agblock_t ltnew; /* useful start bno of left side */ |
879 | xfs_extlen_t rlen; /* length of returned extent */ | |
e26f0501 | 880 | int forced = 0; |
63d20d6e | 881 | #ifdef DEBUG |
1da177e4 LT |
882 | /* |
883 | * Randomly don't execute the first algorithm. | |
884 | */ | |
885 | int dofirst; /* set to do first algorithm */ | |
886 | ||
ecb3403d | 887 | dofirst = prandom_u32() & 1; |
1da177e4 | 888 | #endif |
e26f0501 CH |
889 | |
890 | restart: | |
891 | bno_cur_lt = NULL; | |
892 | bno_cur_gt = NULL; | |
893 | ltlen = 0; | |
894 | gtlena = 0; | |
895 | ltlena = 0; | |
896 | ||
1da177e4 LT |
897 | /* |
898 | * Get a cursor for the by-size btree. | |
899 | */ | |
561f7d17 CH |
900 | cnt_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
901 | args->agno, XFS_BTNUM_CNT); | |
e26f0501 | 902 | |
1da177e4 LT |
903 | /* |
904 | * See if there are any free extents as big as maxlen. | |
905 | */ | |
906 | if ((error = xfs_alloc_lookup_ge(cnt_cur, 0, args->maxlen, &i))) | |
907 | goto error0; | |
908 | /* | |
909 | * If none, then pick up the last entry in the tree unless the | |
910 | * tree is empty. | |
911 | */ | |
912 | if (!i) { | |
913 | if ((error = xfs_alloc_ag_vextent_small(args, cnt_cur, <bno, | |
914 | <len, &i))) | |
915 | goto error0; | |
916 | if (i == 0 || ltlen == 0) { | |
917 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
e26f0501 | 918 | trace_xfs_alloc_near_noentry(args); |
1da177e4 LT |
919 | return 0; |
920 | } | |
921 | ASSERT(i == 1); | |
922 | } | |
923 | args->wasfromfl = 0; | |
e26f0501 | 924 | |
1da177e4 LT |
925 | /* |
926 | * First algorithm. | |
927 | * If the requested extent is large wrt the freespaces available | |
928 | * in this a.g., then the cursor will be pointing to a btree entry | |
929 | * near the right edge of the tree. If it's in the last btree leaf | |
930 | * block, then we just examine all the entries in that block | |
931 | * that are big enough, and pick the best one. | |
932 | * This is written as a while loop so we can break out of it, | |
933 | * but we never loop back to the top. | |
934 | */ | |
935 | while (xfs_btree_islastblock(cnt_cur, 0)) { | |
936 | xfs_extlen_t bdiff; | |
937 | int besti=0; | |
938 | xfs_extlen_t blen=0; | |
939 | xfs_agblock_t bnew=0; | |
940 | ||
63d20d6e DC |
941 | #ifdef DEBUG |
942 | if (dofirst) | |
1da177e4 LT |
943 | break; |
944 | #endif | |
945 | /* | |
946 | * Start from the entry that lookup found, sequence through | |
947 | * all larger free blocks. If we're actually pointing at a | |
948 | * record smaller than maxlen, go to the start of this block, | |
949 | * and skip all those smaller than minlen. | |
950 | */ | |
951 | if (ltlen || args->alignment > 1) { | |
952 | cnt_cur->bc_ptrs[0] = 1; | |
953 | do { | |
954 | if ((error = xfs_alloc_get_rec(cnt_cur, <bno, | |
955 | <len, &i))) | |
956 | goto error0; | |
957 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
958 | if (ltlen >= args->minlen) | |
959 | break; | |
637aa50f | 960 | if ((error = xfs_btree_increment(cnt_cur, 0, &i))) |
1da177e4 LT |
961 | goto error0; |
962 | } while (i); | |
963 | ASSERT(ltlen >= args->minlen); | |
964 | if (!i) | |
965 | break; | |
966 | } | |
967 | i = cnt_cur->bc_ptrs[0]; | |
968 | for (j = 1, blen = 0, bdiff = 0; | |
969 | !error && j && (blen < args->maxlen || bdiff > 0); | |
637aa50f | 970 | error = xfs_btree_increment(cnt_cur, 0, &j)) { |
1da177e4 LT |
971 | /* |
972 | * For each entry, decide if it's better than | |
973 | * the previous best entry. | |
974 | */ | |
975 | if ((error = xfs_alloc_get_rec(cnt_cur, <bno, <len, &i))) | |
976 | goto error0; | |
977 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
86fa8af6 CH |
978 | xfs_alloc_compute_aligned(args, ltbno, ltlen, |
979 | <bnoa, <lena); | |
e6430037 | 980 | if (ltlena < args->minlen) |
1da177e4 LT |
981 | continue; |
982 | args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen); | |
983 | xfs_alloc_fix_len(args); | |
984 | ASSERT(args->len >= args->minlen); | |
985 | if (args->len < blen) | |
986 | continue; | |
987 | ltdiff = xfs_alloc_compute_diff(args->agbno, args->len, | |
211d022c JK |
988 | args->alignment, args->userdata, ltbnoa, |
989 | ltlena, <new); | |
1da177e4 LT |
990 | if (ltnew != NULLAGBLOCK && |
991 | (args->len > blen || ltdiff < bdiff)) { | |
992 | bdiff = ltdiff; | |
993 | bnew = ltnew; | |
994 | blen = args->len; | |
995 | besti = cnt_cur->bc_ptrs[0]; | |
996 | } | |
997 | } | |
998 | /* | |
999 | * It didn't work. We COULD be in a case where | |
1000 | * there's a good record somewhere, so try again. | |
1001 | */ | |
1002 | if (blen == 0) | |
1003 | break; | |
1004 | /* | |
1005 | * Point at the best entry, and retrieve it again. | |
1006 | */ | |
1007 | cnt_cur->bc_ptrs[0] = besti; | |
1008 | if ((error = xfs_alloc_get_rec(cnt_cur, <bno, <len, &i))) | |
1009 | goto error0; | |
1010 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
73523a2e | 1011 | ASSERT(ltbno + ltlen <= be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length)); |
1da177e4 LT |
1012 | args->len = blen; |
1013 | if (!xfs_alloc_fix_minleft(args)) { | |
1014 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
0b1b213f | 1015 | trace_xfs_alloc_near_nominleft(args); |
1da177e4 LT |
1016 | return 0; |
1017 | } | |
1018 | blen = args->len; | |
1019 | /* | |
1020 | * We are allocating starting at bnew for blen blocks. | |
1021 | */ | |
1022 | args->agbno = bnew; | |
1023 | ASSERT(bnew >= ltbno); | |
73523a2e | 1024 | ASSERT(bnew + blen <= ltbno + ltlen); |
1da177e4 LT |
1025 | /* |
1026 | * Set up a cursor for the by-bno tree. | |
1027 | */ | |
561f7d17 CH |
1028 | bno_cur_lt = xfs_allocbt_init_cursor(args->mp, args->tp, |
1029 | args->agbp, args->agno, XFS_BTNUM_BNO); | |
1da177e4 LT |
1030 | /* |
1031 | * Fix up the btree entries. | |
1032 | */ | |
1033 | if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur_lt, ltbno, | |
1034 | ltlen, bnew, blen, XFSA_FIXUP_CNT_OK))) | |
1035 | goto error0; | |
1036 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1037 | xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_NOERROR); | |
0b1b213f CH |
1038 | |
1039 | trace_xfs_alloc_near_first(args); | |
1da177e4 LT |
1040 | return 0; |
1041 | } | |
1042 | /* | |
1043 | * Second algorithm. | |
1044 | * Search in the by-bno tree to the left and to the right | |
1045 | * simultaneously, until in each case we find a space big enough, | |
1046 | * or run into the edge of the tree. When we run into the edge, | |
1047 | * we deallocate that cursor. | |
1048 | * If both searches succeed, we compare the two spaces and pick | |
1049 | * the better one. | |
1050 | * With alignment, it's possible for both to fail; the upper | |
1051 | * level algorithm that picks allocation groups for allocations | |
1052 | * is not supposed to do this. | |
1053 | */ | |
1054 | /* | |
1055 | * Allocate and initialize the cursor for the leftward search. | |
1056 | */ | |
561f7d17 CH |
1057 | bno_cur_lt = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
1058 | args->agno, XFS_BTNUM_BNO); | |
1da177e4 LT |
1059 | /* |
1060 | * Lookup <= bno to find the leftward search's starting point. | |
1061 | */ | |
1062 | if ((error = xfs_alloc_lookup_le(bno_cur_lt, args->agbno, args->maxlen, &i))) | |
1063 | goto error0; | |
1064 | if (!i) { | |
1065 | /* | |
1066 | * Didn't find anything; use this cursor for the rightward | |
1067 | * search. | |
1068 | */ | |
1069 | bno_cur_gt = bno_cur_lt; | |
1070 | bno_cur_lt = NULL; | |
1071 | } | |
1072 | /* | |
1073 | * Found something. Duplicate the cursor for the rightward search. | |
1074 | */ | |
1075 | else if ((error = xfs_btree_dup_cursor(bno_cur_lt, &bno_cur_gt))) | |
1076 | goto error0; | |
1077 | /* | |
1078 | * Increment the cursor, so we will point at the entry just right | |
1079 | * of the leftward entry if any, or to the leftmost entry. | |
1080 | */ | |
637aa50f | 1081 | if ((error = xfs_btree_increment(bno_cur_gt, 0, &i))) |
1da177e4 LT |
1082 | goto error0; |
1083 | if (!i) { | |
1084 | /* | |
1085 | * It failed, there are no rightward entries. | |
1086 | */ | |
1087 | xfs_btree_del_cursor(bno_cur_gt, XFS_BTREE_NOERROR); | |
1088 | bno_cur_gt = NULL; | |
1089 | } | |
1090 | /* | |
1091 | * Loop going left with the leftward cursor, right with the | |
1092 | * rightward cursor, until either both directions give up or | |
1093 | * we find an entry at least as big as minlen. | |
1094 | */ | |
1095 | do { | |
1096 | if (bno_cur_lt) { | |
1097 | if ((error = xfs_alloc_get_rec(bno_cur_lt, <bno, <len, &i))) | |
1098 | goto error0; | |
1099 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
86fa8af6 CH |
1100 | xfs_alloc_compute_aligned(args, ltbno, ltlen, |
1101 | <bnoa, <lena); | |
12375c82 | 1102 | if (ltlena >= args->minlen) |
1da177e4 | 1103 | break; |
8df4da4a | 1104 | if ((error = xfs_btree_decrement(bno_cur_lt, 0, &i))) |
1da177e4 LT |
1105 | goto error0; |
1106 | if (!i) { | |
1107 | xfs_btree_del_cursor(bno_cur_lt, | |
1108 | XFS_BTREE_NOERROR); | |
1109 | bno_cur_lt = NULL; | |
1110 | } | |
1111 | } | |
1112 | if (bno_cur_gt) { | |
1113 | if ((error = xfs_alloc_get_rec(bno_cur_gt, >bno, >len, &i))) | |
1114 | goto error0; | |
1115 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
86fa8af6 CH |
1116 | xfs_alloc_compute_aligned(args, gtbno, gtlen, |
1117 | >bnoa, >lena); | |
12375c82 | 1118 | if (gtlena >= args->minlen) |
1da177e4 | 1119 | break; |
637aa50f | 1120 | if ((error = xfs_btree_increment(bno_cur_gt, 0, &i))) |
1da177e4 LT |
1121 | goto error0; |
1122 | if (!i) { | |
1123 | xfs_btree_del_cursor(bno_cur_gt, | |
1124 | XFS_BTREE_NOERROR); | |
1125 | bno_cur_gt = NULL; | |
1126 | } | |
1127 | } | |
1128 | } while (bno_cur_lt || bno_cur_gt); | |
489a150f | 1129 | |
1da177e4 LT |
1130 | /* |
1131 | * Got both cursors still active, need to find better entry. | |
1132 | */ | |
1133 | if (bno_cur_lt && bno_cur_gt) { | |
1da177e4 LT |
1134 | if (ltlena >= args->minlen) { |
1135 | /* | |
489a150f | 1136 | * Left side is good, look for a right side entry. |
1da177e4 LT |
1137 | */ |
1138 | args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen); | |
1139 | xfs_alloc_fix_len(args); | |
489a150f | 1140 | ltdiff = xfs_alloc_compute_diff(args->agbno, args->len, |
211d022c JK |
1141 | args->alignment, args->userdata, ltbnoa, |
1142 | ltlena, <new); | |
489a150f CH |
1143 | |
1144 | error = xfs_alloc_find_best_extent(args, | |
1145 | &bno_cur_lt, &bno_cur_gt, | |
e26f0501 CH |
1146 | ltdiff, >bno, >len, |
1147 | >bnoa, >lena, | |
489a150f CH |
1148 | 0 /* search right */); |
1149 | } else { | |
1150 | ASSERT(gtlena >= args->minlen); | |
1151 | ||
1da177e4 | 1152 | /* |
489a150f | 1153 | * Right side is good, look for a left side entry. |
1da177e4 LT |
1154 | */ |
1155 | args->len = XFS_EXTLEN_MIN(gtlena, args->maxlen); | |
1156 | xfs_alloc_fix_len(args); | |
489a150f | 1157 | gtdiff = xfs_alloc_compute_diff(args->agbno, args->len, |
211d022c JK |
1158 | args->alignment, args->userdata, gtbnoa, |
1159 | gtlena, >new); | |
489a150f CH |
1160 | |
1161 | error = xfs_alloc_find_best_extent(args, | |
1162 | &bno_cur_gt, &bno_cur_lt, | |
e26f0501 CH |
1163 | gtdiff, <bno, <len, |
1164 | <bnoa, <lena, | |
489a150f | 1165 | 1 /* search left */); |
1da177e4 | 1166 | } |
489a150f CH |
1167 | |
1168 | if (error) | |
1169 | goto error0; | |
1da177e4 | 1170 | } |
489a150f | 1171 | |
1da177e4 LT |
1172 | /* |
1173 | * If we couldn't get anything, give up. | |
1174 | */ | |
1175 | if (bno_cur_lt == NULL && bno_cur_gt == NULL) { | |
e3a746f5 DC |
1176 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
1177 | ||
e26f0501 CH |
1178 | if (!forced++) { |
1179 | trace_xfs_alloc_near_busy(args); | |
1180 | xfs_log_force(args->mp, XFS_LOG_SYNC); | |
1181 | goto restart; | |
1182 | } | |
0b1b213f | 1183 | trace_xfs_alloc_size_neither(args); |
1da177e4 LT |
1184 | args->agbno = NULLAGBLOCK; |
1185 | return 0; | |
1186 | } | |
489a150f | 1187 | |
1da177e4 LT |
1188 | /* |
1189 | * At this point we have selected a freespace entry, either to the | |
1190 | * left or to the right. If it's on the right, copy all the | |
1191 | * useful variables to the "left" set so we only have one | |
1192 | * copy of this code. | |
1193 | */ | |
1194 | if (bno_cur_gt) { | |
1195 | bno_cur_lt = bno_cur_gt; | |
1196 | bno_cur_gt = NULL; | |
1197 | ltbno = gtbno; | |
1198 | ltbnoa = gtbnoa; | |
1199 | ltlen = gtlen; | |
1200 | ltlena = gtlena; | |
1201 | j = 1; | |
1202 | } else | |
1203 | j = 0; | |
489a150f | 1204 | |
1da177e4 LT |
1205 | /* |
1206 | * Fix up the length and compute the useful address. | |
1207 | */ | |
1da177e4 LT |
1208 | args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen); |
1209 | xfs_alloc_fix_len(args); | |
1210 | if (!xfs_alloc_fix_minleft(args)) { | |
0b1b213f | 1211 | trace_xfs_alloc_near_nominleft(args); |
1da177e4 LT |
1212 | xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_NOERROR); |
1213 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1214 | return 0; | |
1215 | } | |
1216 | rlen = args->len; | |
e26f0501 | 1217 | (void)xfs_alloc_compute_diff(args->agbno, rlen, args->alignment, |
211d022c | 1218 | args->userdata, ltbnoa, ltlena, <new); |
1da177e4 | 1219 | ASSERT(ltnew >= ltbno); |
e26f0501 | 1220 | ASSERT(ltnew + rlen <= ltbnoa + ltlena); |
16259e7d | 1221 | ASSERT(ltnew + rlen <= be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length)); |
1da177e4 | 1222 | args->agbno = ltnew; |
e26f0501 | 1223 | |
1da177e4 LT |
1224 | if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur_lt, ltbno, ltlen, |
1225 | ltnew, rlen, XFSA_FIXUP_BNO_OK))) | |
1226 | goto error0; | |
0b1b213f CH |
1227 | |
1228 | if (j) | |
1229 | trace_xfs_alloc_near_greater(args); | |
1230 | else | |
1231 | trace_xfs_alloc_near_lesser(args); | |
1232 | ||
1da177e4 LT |
1233 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
1234 | xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_NOERROR); | |
1235 | return 0; | |
1236 | ||
1237 | error0: | |
0b1b213f | 1238 | trace_xfs_alloc_near_error(args); |
1da177e4 LT |
1239 | if (cnt_cur != NULL) |
1240 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); | |
1241 | if (bno_cur_lt != NULL) | |
1242 | xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_ERROR); | |
1243 | if (bno_cur_gt != NULL) | |
1244 | xfs_btree_del_cursor(bno_cur_gt, XFS_BTREE_ERROR); | |
1245 | return error; | |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * Allocate a variable extent anywhere in the allocation group agno. | |
1250 | * Extent's length (returned in len) will be between minlen and maxlen, | |
1251 | * and of the form k * prod + mod unless there's nothing that large. | |
1252 | * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. | |
1253 | */ | |
1254 | STATIC int /* error */ | |
1255 | xfs_alloc_ag_vextent_size( | |
1256 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
1257 | { | |
1258 | xfs_btree_cur_t *bno_cur; /* cursor for bno btree */ | |
1259 | xfs_btree_cur_t *cnt_cur; /* cursor for cnt btree */ | |
1260 | int error; /* error result */ | |
1261 | xfs_agblock_t fbno; /* start of found freespace */ | |
1262 | xfs_extlen_t flen; /* length of found freespace */ | |
1da177e4 LT |
1263 | int i; /* temp status variable */ |
1264 | xfs_agblock_t rbno; /* returned block number */ | |
1265 | xfs_extlen_t rlen; /* length of returned extent */ | |
e26f0501 | 1266 | int forced = 0; |
1da177e4 | 1267 | |
e26f0501 | 1268 | restart: |
1da177e4 LT |
1269 | /* |
1270 | * Allocate and initialize a cursor for the by-size btree. | |
1271 | */ | |
561f7d17 CH |
1272 | cnt_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
1273 | args->agno, XFS_BTNUM_CNT); | |
1da177e4 | 1274 | bno_cur = NULL; |
e26f0501 | 1275 | |
1da177e4 LT |
1276 | /* |
1277 | * Look for an entry >= maxlen+alignment-1 blocks. | |
1278 | */ | |
1279 | if ((error = xfs_alloc_lookup_ge(cnt_cur, 0, | |
1280 | args->maxlen + args->alignment - 1, &i))) | |
1281 | goto error0; | |
e26f0501 | 1282 | |
1da177e4 | 1283 | /* |
e26f0501 CH |
1284 | * If none or we have busy extents that we cannot allocate from, then |
1285 | * we have to settle for a smaller extent. In the case that there are | |
1286 | * no large extents, this will return the last entry in the tree unless | |
1287 | * the tree is empty. In the case that there are only busy large | |
1288 | * extents, this will return the largest small extent unless there | |
1289 | * are no smaller extents available. | |
1da177e4 | 1290 | */ |
e26f0501 CH |
1291 | if (!i || forced > 1) { |
1292 | error = xfs_alloc_ag_vextent_small(args, cnt_cur, | |
1293 | &fbno, &flen, &i); | |
1294 | if (error) | |
1da177e4 LT |
1295 | goto error0; |
1296 | if (i == 0 || flen == 0) { | |
1297 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
0b1b213f | 1298 | trace_xfs_alloc_size_noentry(args); |
1da177e4 LT |
1299 | return 0; |
1300 | } | |
1301 | ASSERT(i == 1); | |
e26f0501 CH |
1302 | xfs_alloc_compute_aligned(args, fbno, flen, &rbno, &rlen); |
1303 | } else { | |
1304 | /* | |
1305 | * Search for a non-busy extent that is large enough. | |
1306 | * If we are at low space, don't check, or if we fall of | |
1307 | * the end of the btree, turn off the busy check and | |
1308 | * restart. | |
1309 | */ | |
1310 | for (;;) { | |
1311 | error = xfs_alloc_get_rec(cnt_cur, &fbno, &flen, &i); | |
1312 | if (error) | |
1313 | goto error0; | |
1314 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1315 | ||
1316 | xfs_alloc_compute_aligned(args, fbno, flen, | |
1317 | &rbno, &rlen); | |
1318 | ||
1319 | if (rlen >= args->maxlen) | |
1320 | break; | |
1321 | ||
1322 | error = xfs_btree_increment(cnt_cur, 0, &i); | |
1323 | if (error) | |
1324 | goto error0; | |
1325 | if (i == 0) { | |
1326 | /* | |
1327 | * Our only valid extents must have been busy. | |
1328 | * Make it unbusy by forcing the log out and | |
1329 | * retrying. If we've been here before, forcing | |
1330 | * the log isn't making the extents available, | |
1331 | * which means they have probably been freed in | |
1332 | * this transaction. In that case, we have to | |
1333 | * give up on them and we'll attempt a minlen | |
1334 | * allocation the next time around. | |
1335 | */ | |
1336 | xfs_btree_del_cursor(cnt_cur, | |
1337 | XFS_BTREE_NOERROR); | |
1338 | trace_xfs_alloc_size_busy(args); | |
1339 | if (!forced++) | |
1340 | xfs_log_force(args->mp, XFS_LOG_SYNC); | |
1341 | goto restart; | |
1342 | } | |
1343 | } | |
1da177e4 | 1344 | } |
e26f0501 | 1345 | |
1da177e4 LT |
1346 | /* |
1347 | * In the first case above, we got the last entry in the | |
1348 | * by-size btree. Now we check to see if the space hits maxlen | |
1349 | * once aligned; if not, we search left for something better. | |
1350 | * This can't happen in the second case above. | |
1351 | */ | |
1da177e4 LT |
1352 | rlen = XFS_EXTLEN_MIN(args->maxlen, rlen); |
1353 | XFS_WANT_CORRUPTED_GOTO(rlen == 0 || | |
1354 | (rlen <= flen && rbno + rlen <= fbno + flen), error0); | |
1355 | if (rlen < args->maxlen) { | |
1356 | xfs_agblock_t bestfbno; | |
1357 | xfs_extlen_t bestflen; | |
1358 | xfs_agblock_t bestrbno; | |
1359 | xfs_extlen_t bestrlen; | |
1360 | ||
1361 | bestrlen = rlen; | |
1362 | bestrbno = rbno; | |
1363 | bestflen = flen; | |
1364 | bestfbno = fbno; | |
1365 | for (;;) { | |
8df4da4a | 1366 | if ((error = xfs_btree_decrement(cnt_cur, 0, &i))) |
1da177e4 LT |
1367 | goto error0; |
1368 | if (i == 0) | |
1369 | break; | |
1370 | if ((error = xfs_alloc_get_rec(cnt_cur, &fbno, &flen, | |
1371 | &i))) | |
1372 | goto error0; | |
1373 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1374 | if (flen < bestrlen) | |
1375 | break; | |
86fa8af6 CH |
1376 | xfs_alloc_compute_aligned(args, fbno, flen, |
1377 | &rbno, &rlen); | |
1da177e4 LT |
1378 | rlen = XFS_EXTLEN_MIN(args->maxlen, rlen); |
1379 | XFS_WANT_CORRUPTED_GOTO(rlen == 0 || | |
1380 | (rlen <= flen && rbno + rlen <= fbno + flen), | |
1381 | error0); | |
1382 | if (rlen > bestrlen) { | |
1383 | bestrlen = rlen; | |
1384 | bestrbno = rbno; | |
1385 | bestflen = flen; | |
1386 | bestfbno = fbno; | |
1387 | if (rlen == args->maxlen) | |
1388 | break; | |
1389 | } | |
1390 | } | |
1391 | if ((error = xfs_alloc_lookup_eq(cnt_cur, bestfbno, bestflen, | |
1392 | &i))) | |
1393 | goto error0; | |
1394 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1395 | rlen = bestrlen; | |
1396 | rbno = bestrbno; | |
1397 | flen = bestflen; | |
1398 | fbno = bestfbno; | |
1399 | } | |
1400 | args->wasfromfl = 0; | |
1401 | /* | |
1402 | * Fix up the length. | |
1403 | */ | |
1404 | args->len = rlen; | |
e26f0501 CH |
1405 | if (rlen < args->minlen) { |
1406 | if (!forced++) { | |
1407 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1408 | trace_xfs_alloc_size_busy(args); | |
1409 | xfs_log_force(args->mp, XFS_LOG_SYNC); | |
1410 | goto restart; | |
1411 | } | |
1412 | goto out_nominleft; | |
1da177e4 | 1413 | } |
e26f0501 CH |
1414 | xfs_alloc_fix_len(args); |
1415 | ||
1416 | if (!xfs_alloc_fix_minleft(args)) | |
1417 | goto out_nominleft; | |
1da177e4 LT |
1418 | rlen = args->len; |
1419 | XFS_WANT_CORRUPTED_GOTO(rlen <= flen, error0); | |
1420 | /* | |
1421 | * Allocate and initialize a cursor for the by-block tree. | |
1422 | */ | |
561f7d17 CH |
1423 | bno_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
1424 | args->agno, XFS_BTNUM_BNO); | |
1da177e4 LT |
1425 | if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur, fbno, flen, |
1426 | rbno, rlen, XFSA_FIXUP_CNT_OK))) | |
1427 | goto error0; | |
1428 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1429 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
1430 | cnt_cur = bno_cur = NULL; | |
1431 | args->len = rlen; | |
1432 | args->agbno = rbno; | |
1433 | XFS_WANT_CORRUPTED_GOTO( | |
1434 | args->agbno + args->len <= | |
16259e7d | 1435 | be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length), |
1da177e4 | 1436 | error0); |
0b1b213f | 1437 | trace_xfs_alloc_size_done(args); |
1da177e4 LT |
1438 | return 0; |
1439 | ||
1440 | error0: | |
0b1b213f | 1441 | trace_xfs_alloc_size_error(args); |
1da177e4 LT |
1442 | if (cnt_cur) |
1443 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); | |
1444 | if (bno_cur) | |
1445 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); | |
1446 | return error; | |
e26f0501 CH |
1447 | |
1448 | out_nominleft: | |
1449 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1450 | trace_xfs_alloc_size_nominleft(args); | |
1451 | args->agbno = NULLAGBLOCK; | |
1452 | return 0; | |
1da177e4 LT |
1453 | } |
1454 | ||
1455 | /* | |
1456 | * Deal with the case where only small freespaces remain. | |
1457 | * Either return the contents of the last freespace record, | |
1458 | * or allocate space from the freelist if there is nothing in the tree. | |
1459 | */ | |
1460 | STATIC int /* error */ | |
1461 | xfs_alloc_ag_vextent_small( | |
1462 | xfs_alloc_arg_t *args, /* allocation argument structure */ | |
1463 | xfs_btree_cur_t *ccur, /* by-size cursor */ | |
1464 | xfs_agblock_t *fbnop, /* result block number */ | |
1465 | xfs_extlen_t *flenp, /* result length */ | |
1466 | int *stat) /* status: 0-freelist, 1-normal/none */ | |
1467 | { | |
1468 | int error; | |
1469 | xfs_agblock_t fbno; | |
1470 | xfs_extlen_t flen; | |
1da177e4 LT |
1471 | int i; |
1472 | ||
8df4da4a | 1473 | if ((error = xfs_btree_decrement(ccur, 0, &i))) |
1da177e4 LT |
1474 | goto error0; |
1475 | if (i) { | |
1476 | if ((error = xfs_alloc_get_rec(ccur, &fbno, &flen, &i))) | |
1477 | goto error0; | |
1478 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1479 | } | |
1480 | /* | |
1481 | * Nothing in the btree, try the freelist. Make sure | |
1482 | * to respect minleft even when pulling from the | |
1483 | * freelist. | |
1484 | */ | |
1485 | else if (args->minlen == 1 && args->alignment == 1 && !args->isfl && | |
16259e7d CH |
1486 | (be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_flcount) |
1487 | > args->minleft)) { | |
92821e2b DC |
1488 | error = xfs_alloc_get_freelist(args->tp, args->agbp, &fbno, 0); |
1489 | if (error) | |
1da177e4 LT |
1490 | goto error0; |
1491 | if (fbno != NULLAGBLOCK) { | |
4ecbfe63 | 1492 | xfs_extent_busy_reuse(args->mp, args->agno, fbno, 1, |
97d3ac75 CH |
1493 | args->userdata); |
1494 | ||
1da177e4 LT |
1495 | if (args->userdata) { |
1496 | xfs_buf_t *bp; | |
1497 | ||
1498 | bp = xfs_btree_get_bufs(args->mp, args->tp, | |
1499 | args->agno, fbno, 0); | |
1500 | xfs_trans_binval(args->tp, bp); | |
1501 | } | |
1502 | args->len = 1; | |
1503 | args->agbno = fbno; | |
1504 | XFS_WANT_CORRUPTED_GOTO( | |
1505 | args->agbno + args->len <= | |
16259e7d | 1506 | be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length), |
1da177e4 LT |
1507 | error0); |
1508 | args->wasfromfl = 1; | |
0b1b213f | 1509 | trace_xfs_alloc_small_freelist(args); |
1da177e4 LT |
1510 | *stat = 0; |
1511 | return 0; | |
1512 | } | |
1513 | /* | |
1514 | * Nothing in the freelist. | |
1515 | */ | |
1516 | else | |
1517 | flen = 0; | |
1518 | } | |
1519 | /* | |
1520 | * Can't allocate from the freelist for some reason. | |
1521 | */ | |
d432c80e NS |
1522 | else { |
1523 | fbno = NULLAGBLOCK; | |
1da177e4 | 1524 | flen = 0; |
d432c80e | 1525 | } |
1da177e4 LT |
1526 | /* |
1527 | * Can't do the allocation, give up. | |
1528 | */ | |
1529 | if (flen < args->minlen) { | |
1530 | args->agbno = NULLAGBLOCK; | |
0b1b213f | 1531 | trace_xfs_alloc_small_notenough(args); |
1da177e4 LT |
1532 | flen = 0; |
1533 | } | |
1534 | *fbnop = fbno; | |
1535 | *flenp = flen; | |
1536 | *stat = 1; | |
0b1b213f | 1537 | trace_xfs_alloc_small_done(args); |
1da177e4 LT |
1538 | return 0; |
1539 | ||
1540 | error0: | |
0b1b213f | 1541 | trace_xfs_alloc_small_error(args); |
1da177e4 LT |
1542 | return error; |
1543 | } | |
1544 | ||
1545 | /* | |
1546 | * Free the extent starting at agno/bno for length. | |
1547 | */ | |
1548 | STATIC int /* error */ | |
1549 | xfs_free_ag_extent( | |
1550 | xfs_trans_t *tp, /* transaction pointer */ | |
1551 | xfs_buf_t *agbp, /* buffer for a.g. freelist header */ | |
1552 | xfs_agnumber_t agno, /* allocation group number */ | |
1553 | xfs_agblock_t bno, /* starting block number */ | |
1554 | xfs_extlen_t len, /* length of extent */ | |
1555 | int isfl) /* set if is freelist blocks - no sb acctg */ | |
1556 | { | |
1557 | xfs_btree_cur_t *bno_cur; /* cursor for by-block btree */ | |
1558 | xfs_btree_cur_t *cnt_cur; /* cursor for by-size btree */ | |
1559 | int error; /* error return value */ | |
1da177e4 LT |
1560 | xfs_agblock_t gtbno; /* start of right neighbor block */ |
1561 | xfs_extlen_t gtlen; /* length of right neighbor block */ | |
1562 | int haveleft; /* have a left neighbor block */ | |
1563 | int haveright; /* have a right neighbor block */ | |
1564 | int i; /* temp, result code */ | |
1565 | xfs_agblock_t ltbno; /* start of left neighbor block */ | |
1566 | xfs_extlen_t ltlen; /* length of left neighbor block */ | |
1567 | xfs_mount_t *mp; /* mount point struct for filesystem */ | |
1568 | xfs_agblock_t nbno; /* new starting block of freespace */ | |
1569 | xfs_extlen_t nlen; /* new length of freespace */ | |
ecb6928f | 1570 | xfs_perag_t *pag; /* per allocation group data */ |
1da177e4 LT |
1571 | |
1572 | mp = tp->t_mountp; | |
1573 | /* | |
1574 | * Allocate and initialize a cursor for the by-block btree. | |
1575 | */ | |
561f7d17 | 1576 | bno_cur = xfs_allocbt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_BNO); |
1da177e4 LT |
1577 | cnt_cur = NULL; |
1578 | /* | |
1579 | * Look for a neighboring block on the left (lower block numbers) | |
1580 | * that is contiguous with this space. | |
1581 | */ | |
1582 | if ((error = xfs_alloc_lookup_le(bno_cur, bno, len, &haveleft))) | |
1583 | goto error0; | |
1584 | if (haveleft) { | |
1585 | /* | |
1586 | * There is a block to our left. | |
1587 | */ | |
1588 | if ((error = xfs_alloc_get_rec(bno_cur, <bno, <len, &i))) | |
1589 | goto error0; | |
1590 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1591 | /* | |
1592 | * It's not contiguous, though. | |
1593 | */ | |
1594 | if (ltbno + ltlen < bno) | |
1595 | haveleft = 0; | |
1596 | else { | |
1597 | /* | |
1598 | * If this failure happens the request to free this | |
1599 | * space was invalid, it's (partly) already free. | |
1600 | * Very bad. | |
1601 | */ | |
1602 | XFS_WANT_CORRUPTED_GOTO(ltbno + ltlen <= bno, error0); | |
1603 | } | |
1604 | } | |
1605 | /* | |
1606 | * Look for a neighboring block on the right (higher block numbers) | |
1607 | * that is contiguous with this space. | |
1608 | */ | |
637aa50f | 1609 | if ((error = xfs_btree_increment(bno_cur, 0, &haveright))) |
1da177e4 LT |
1610 | goto error0; |
1611 | if (haveright) { | |
1612 | /* | |
1613 | * There is a block to our right. | |
1614 | */ | |
1615 | if ((error = xfs_alloc_get_rec(bno_cur, >bno, >len, &i))) | |
1616 | goto error0; | |
1617 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1618 | /* | |
1619 | * It's not contiguous, though. | |
1620 | */ | |
1621 | if (bno + len < gtbno) | |
1622 | haveright = 0; | |
1623 | else { | |
1624 | /* | |
1625 | * If this failure happens the request to free this | |
1626 | * space was invalid, it's (partly) already free. | |
1627 | * Very bad. | |
1628 | */ | |
1629 | XFS_WANT_CORRUPTED_GOTO(gtbno >= bno + len, error0); | |
1630 | } | |
1631 | } | |
1632 | /* | |
1633 | * Now allocate and initialize a cursor for the by-size tree. | |
1634 | */ | |
561f7d17 | 1635 | cnt_cur = xfs_allocbt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_CNT); |
1da177e4 LT |
1636 | /* |
1637 | * Have both left and right contiguous neighbors. | |
1638 | * Merge all three into a single free block. | |
1639 | */ | |
1640 | if (haveleft && haveright) { | |
1641 | /* | |
1642 | * Delete the old by-size entry on the left. | |
1643 | */ | |
1644 | if ((error = xfs_alloc_lookup_eq(cnt_cur, ltbno, ltlen, &i))) | |
1645 | goto error0; | |
1646 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
91cca5df | 1647 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
1da177e4 LT |
1648 | goto error0; |
1649 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1650 | /* | |
1651 | * Delete the old by-size entry on the right. | |
1652 | */ | |
1653 | if ((error = xfs_alloc_lookup_eq(cnt_cur, gtbno, gtlen, &i))) | |
1654 | goto error0; | |
1655 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
91cca5df | 1656 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
1da177e4 LT |
1657 | goto error0; |
1658 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1659 | /* | |
1660 | * Delete the old by-block entry for the right block. | |
1661 | */ | |
91cca5df | 1662 | if ((error = xfs_btree_delete(bno_cur, &i))) |
1da177e4 LT |
1663 | goto error0; |
1664 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1665 | /* | |
1666 | * Move the by-block cursor back to the left neighbor. | |
1667 | */ | |
8df4da4a | 1668 | if ((error = xfs_btree_decrement(bno_cur, 0, &i))) |
1da177e4 LT |
1669 | goto error0; |
1670 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1671 | #ifdef DEBUG | |
1672 | /* | |
1673 | * Check that this is the right record: delete didn't | |
1674 | * mangle the cursor. | |
1675 | */ | |
1676 | { | |
1677 | xfs_agblock_t xxbno; | |
1678 | xfs_extlen_t xxlen; | |
1679 | ||
1680 | if ((error = xfs_alloc_get_rec(bno_cur, &xxbno, &xxlen, | |
1681 | &i))) | |
1682 | goto error0; | |
1683 | XFS_WANT_CORRUPTED_GOTO( | |
1684 | i == 1 && xxbno == ltbno && xxlen == ltlen, | |
1685 | error0); | |
1686 | } | |
1687 | #endif | |
1688 | /* | |
1689 | * Update remaining by-block entry to the new, joined block. | |
1690 | */ | |
1691 | nbno = ltbno; | |
1692 | nlen = len + ltlen + gtlen; | |
1693 | if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) | |
1694 | goto error0; | |
1695 | } | |
1696 | /* | |
1697 | * Have only a left contiguous neighbor. | |
1698 | * Merge it together with the new freespace. | |
1699 | */ | |
1700 | else if (haveleft) { | |
1701 | /* | |
1702 | * Delete the old by-size entry on the left. | |
1703 | */ | |
1704 | if ((error = xfs_alloc_lookup_eq(cnt_cur, ltbno, ltlen, &i))) | |
1705 | goto error0; | |
1706 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
91cca5df | 1707 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
1da177e4 LT |
1708 | goto error0; |
1709 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1710 | /* | |
1711 | * Back up the by-block cursor to the left neighbor, and | |
1712 | * update its length. | |
1713 | */ | |
8df4da4a | 1714 | if ((error = xfs_btree_decrement(bno_cur, 0, &i))) |
1da177e4 LT |
1715 | goto error0; |
1716 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1717 | nbno = ltbno; | |
1718 | nlen = len + ltlen; | |
1719 | if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) | |
1720 | goto error0; | |
1721 | } | |
1722 | /* | |
1723 | * Have only a right contiguous neighbor. | |
1724 | * Merge it together with the new freespace. | |
1725 | */ | |
1726 | else if (haveright) { | |
1727 | /* | |
1728 | * Delete the old by-size entry on the right. | |
1729 | */ | |
1730 | if ((error = xfs_alloc_lookup_eq(cnt_cur, gtbno, gtlen, &i))) | |
1731 | goto error0; | |
1732 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
91cca5df | 1733 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
1da177e4 LT |
1734 | goto error0; |
1735 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1736 | /* | |
1737 | * Update the starting block and length of the right | |
1738 | * neighbor in the by-block tree. | |
1739 | */ | |
1740 | nbno = bno; | |
1741 | nlen = len + gtlen; | |
1742 | if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) | |
1743 | goto error0; | |
1744 | } | |
1745 | /* | |
1746 | * No contiguous neighbors. | |
1747 | * Insert the new freespace into the by-block tree. | |
1748 | */ | |
1749 | else { | |
1750 | nbno = bno; | |
1751 | nlen = len; | |
4b22a571 | 1752 | if ((error = xfs_btree_insert(bno_cur, &i))) |
1da177e4 LT |
1753 | goto error0; |
1754 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1755 | } | |
1756 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
1757 | bno_cur = NULL; | |
1758 | /* | |
1759 | * In all cases we need to insert the new freespace in the by-size tree. | |
1760 | */ | |
1761 | if ((error = xfs_alloc_lookup_eq(cnt_cur, nbno, nlen, &i))) | |
1762 | goto error0; | |
1763 | XFS_WANT_CORRUPTED_GOTO(i == 0, error0); | |
4b22a571 | 1764 | if ((error = xfs_btree_insert(cnt_cur, &i))) |
1da177e4 LT |
1765 | goto error0; |
1766 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); | |
1767 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1768 | cnt_cur = NULL; | |
ecb6928f | 1769 | |
1da177e4 LT |
1770 | /* |
1771 | * Update the freespace totals in the ag and superblock. | |
1772 | */ | |
ecb6928f CH |
1773 | pag = xfs_perag_get(mp, agno); |
1774 | error = xfs_alloc_update_counters(tp, pag, agbp, len); | |
1775 | xfs_perag_put(pag); | |
1776 | if (error) | |
1777 | goto error0; | |
1778 | ||
1779 | if (!isfl) | |
1780 | xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, (long)len); | |
1781 | XFS_STATS_INC(xs_freex); | |
1782 | XFS_STATS_ADD(xs_freeb, len); | |
0b1b213f CH |
1783 | |
1784 | trace_xfs_free_extent(mp, agno, bno, len, isfl, haveleft, haveright); | |
1da177e4 | 1785 | |
1da177e4 LT |
1786 | return 0; |
1787 | ||
1788 | error0: | |
0b1b213f | 1789 | trace_xfs_free_extent(mp, agno, bno, len, isfl, -1, -1); |
1da177e4 LT |
1790 | if (bno_cur) |
1791 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); | |
1792 | if (cnt_cur) | |
1793 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); | |
1794 | return error; | |
1795 | } | |
1796 | ||
1797 | /* | |
1798 | * Visible (exported) allocation/free functions. | |
1799 | * Some of these are used just by xfs_alloc_btree.c and this file. | |
1800 | */ | |
1801 | ||
1802 | /* | |
1803 | * Compute and fill in value of m_ag_maxlevels. | |
1804 | */ | |
1805 | void | |
1806 | xfs_alloc_compute_maxlevels( | |
1807 | xfs_mount_t *mp) /* file system mount structure */ | |
1808 | { | |
1809 | int level; | |
1810 | uint maxblocks; | |
1811 | uint maxleafents; | |
1812 | int minleafrecs; | |
1813 | int minnoderecs; | |
1814 | ||
1815 | maxleafents = (mp->m_sb.sb_agblocks + 1) / 2; | |
1816 | minleafrecs = mp->m_alloc_mnr[0]; | |
1817 | minnoderecs = mp->m_alloc_mnr[1]; | |
1818 | maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs; | |
1819 | for (level = 1; maxblocks > 1; level++) | |
1820 | maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs; | |
1821 | mp->m_ag_maxlevels = level; | |
1822 | } | |
1823 | ||
6cc87645 DC |
1824 | /* |
1825 | * Find the length of the longest extent in an AG. | |
1826 | */ | |
1827 | xfs_extlen_t | |
1828 | xfs_alloc_longest_free_extent( | |
1829 | struct xfs_mount *mp, | |
1830 | struct xfs_perag *pag) | |
1831 | { | |
1832 | xfs_extlen_t need, delta = 0; | |
1833 | ||
1834 | need = XFS_MIN_FREELIST_PAG(pag, mp); | |
1835 | if (need > pag->pagf_flcount) | |
1836 | delta = need - pag->pagf_flcount; | |
1837 | ||
1838 | if (pag->pagf_longest > delta) | |
1839 | return pag->pagf_longest - delta; | |
1840 | return pag->pagf_flcount > 0 || pag->pagf_longest > 0; | |
1841 | } | |
1842 | ||
1da177e4 LT |
1843 | /* |
1844 | * Decide whether to use this allocation group for this allocation. | |
1845 | * If so, fix up the btree freelist's size. | |
1846 | */ | |
1847 | STATIC int /* error */ | |
1848 | xfs_alloc_fix_freelist( | |
1849 | xfs_alloc_arg_t *args, /* allocation argument structure */ | |
1850 | int flags) /* XFS_ALLOC_FLAG_... */ | |
1851 | { | |
1852 | xfs_buf_t *agbp; /* agf buffer pointer */ | |
1853 | xfs_agf_t *agf; /* a.g. freespace structure pointer */ | |
1854 | xfs_buf_t *agflbp;/* agfl buffer pointer */ | |
1855 | xfs_agblock_t bno; /* freelist block */ | |
1856 | xfs_extlen_t delta; /* new blocks needed in freelist */ | |
1857 | int error; /* error result code */ | |
1858 | xfs_extlen_t longest;/* longest extent in allocation group */ | |
1859 | xfs_mount_t *mp; /* file system mount point structure */ | |
1860 | xfs_extlen_t need; /* total blocks needed in freelist */ | |
1861 | xfs_perag_t *pag; /* per-ag information structure */ | |
1862 | xfs_alloc_arg_t targs; /* local allocation arguments */ | |
1863 | xfs_trans_t *tp; /* transaction pointer */ | |
1864 | ||
1865 | mp = args->mp; | |
1866 | ||
1867 | pag = args->pag; | |
1868 | tp = args->tp; | |
1869 | if (!pag->pagf_init) { | |
1870 | if ((error = xfs_alloc_read_agf(mp, tp, args->agno, flags, | |
1871 | &agbp))) | |
1872 | return error; | |
1873 | if (!pag->pagf_init) { | |
0e1edbd9 NS |
1874 | ASSERT(flags & XFS_ALLOC_FLAG_TRYLOCK); |
1875 | ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); | |
1da177e4 LT |
1876 | args->agbp = NULL; |
1877 | return 0; | |
1878 | } | |
1879 | } else | |
1880 | agbp = NULL; | |
1881 | ||
0e1edbd9 NS |
1882 | /* |
1883 | * If this is a metadata preferred pag and we are user data | |
1da177e4 LT |
1884 | * then try somewhere else if we are not being asked to |
1885 | * try harder at this point | |
1886 | */ | |
0e1edbd9 NS |
1887 | if (pag->pagf_metadata && args->userdata && |
1888 | (flags & XFS_ALLOC_FLAG_TRYLOCK)) { | |
1889 | ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); | |
1da177e4 LT |
1890 | args->agbp = NULL; |
1891 | return 0; | |
1892 | } | |
1893 | ||
0e1edbd9 | 1894 | if (!(flags & XFS_ALLOC_FLAG_FREEING)) { |
0e1edbd9 NS |
1895 | /* |
1896 | * If it looks like there isn't a long enough extent, or enough | |
1897 | * total blocks, reject it. | |
1898 | */ | |
6cc87645 DC |
1899 | need = XFS_MIN_FREELIST_PAG(pag, mp); |
1900 | longest = xfs_alloc_longest_free_extent(mp, pag); | |
0e1edbd9 NS |
1901 | if ((args->minlen + args->alignment + args->minalignslop - 1) > |
1902 | longest || | |
1903 | ((int)(pag->pagf_freeblks + pag->pagf_flcount - | |
1904 | need - args->total) < (int)args->minleft)) { | |
1905 | if (agbp) | |
1906 | xfs_trans_brelse(tp, agbp); | |
1907 | args->agbp = NULL; | |
1908 | return 0; | |
1909 | } | |
1da177e4 | 1910 | } |
0e1edbd9 | 1911 | |
1da177e4 LT |
1912 | /* |
1913 | * Get the a.g. freespace buffer. | |
1914 | * Can fail if we're not blocking on locks, and it's held. | |
1915 | */ | |
1916 | if (agbp == NULL) { | |
1917 | if ((error = xfs_alloc_read_agf(mp, tp, args->agno, flags, | |
1918 | &agbp))) | |
1919 | return error; | |
1920 | if (agbp == NULL) { | |
0e1edbd9 NS |
1921 | ASSERT(flags & XFS_ALLOC_FLAG_TRYLOCK); |
1922 | ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); | |
1da177e4 LT |
1923 | args->agbp = NULL; |
1924 | return 0; | |
1925 | } | |
1926 | } | |
1927 | /* | |
1928 | * Figure out how many blocks we should have in the freelist. | |
1929 | */ | |
1930 | agf = XFS_BUF_TO_AGF(agbp); | |
1931 | need = XFS_MIN_FREELIST(agf, mp); | |
1da177e4 LT |
1932 | /* |
1933 | * If there isn't enough total or single-extent, reject it. | |
1934 | */ | |
0e1edbd9 NS |
1935 | if (!(flags & XFS_ALLOC_FLAG_FREEING)) { |
1936 | delta = need > be32_to_cpu(agf->agf_flcount) ? | |
1937 | (need - be32_to_cpu(agf->agf_flcount)) : 0; | |
1938 | longest = be32_to_cpu(agf->agf_longest); | |
1939 | longest = (longest > delta) ? (longest - delta) : | |
1940 | (be32_to_cpu(agf->agf_flcount) > 0 || longest > 0); | |
1941 | if ((args->minlen + args->alignment + args->minalignslop - 1) > | |
1942 | longest || | |
1943 | ((int)(be32_to_cpu(agf->agf_freeblks) + | |
1944 | be32_to_cpu(agf->agf_flcount) - need - args->total) < | |
1945 | (int)args->minleft)) { | |
1946 | xfs_trans_brelse(tp, agbp); | |
1947 | args->agbp = NULL; | |
1948 | return 0; | |
1949 | } | |
1da177e4 LT |
1950 | } |
1951 | /* | |
1952 | * Make the freelist shorter if it's too long. | |
1953 | */ | |
16259e7d | 1954 | while (be32_to_cpu(agf->agf_flcount) > need) { |
1da177e4 LT |
1955 | xfs_buf_t *bp; |
1956 | ||
92821e2b DC |
1957 | error = xfs_alloc_get_freelist(tp, agbp, &bno, 0); |
1958 | if (error) | |
1da177e4 LT |
1959 | return error; |
1960 | if ((error = xfs_free_ag_extent(tp, agbp, args->agno, bno, 1, 1))) | |
1961 | return error; | |
1962 | bp = xfs_btree_get_bufs(mp, tp, args->agno, bno, 0); | |
1963 | xfs_trans_binval(tp, bp); | |
1964 | } | |
1965 | /* | |
1966 | * Initialize the args structure. | |
1967 | */ | |
a0041684 | 1968 | memset(&targs, 0, sizeof(targs)); |
1da177e4 LT |
1969 | targs.tp = tp; |
1970 | targs.mp = mp; | |
1971 | targs.agbp = agbp; | |
1972 | targs.agno = args->agno; | |
1da177e4 LT |
1973 | targs.alignment = targs.minlen = targs.prod = targs.isfl = 1; |
1974 | targs.type = XFS_ALLOCTYPE_THIS_AG; | |
1975 | targs.pag = pag; | |
1976 | if ((error = xfs_alloc_read_agfl(mp, tp, targs.agno, &agflbp))) | |
1977 | return error; | |
1978 | /* | |
1979 | * Make the freelist longer if it's too short. | |
1980 | */ | |
16259e7d | 1981 | while (be32_to_cpu(agf->agf_flcount) < need) { |
1da177e4 | 1982 | targs.agbno = 0; |
16259e7d | 1983 | targs.maxlen = need - be32_to_cpu(agf->agf_flcount); |
1da177e4 LT |
1984 | /* |
1985 | * Allocate as many blocks as possible at once. | |
1986 | */ | |
e63a3690 NS |
1987 | if ((error = xfs_alloc_ag_vextent(&targs))) { |
1988 | xfs_trans_brelse(tp, agflbp); | |
1da177e4 | 1989 | return error; |
e63a3690 | 1990 | } |
1da177e4 LT |
1991 | /* |
1992 | * Stop if we run out. Won't happen if callers are obeying | |
1993 | * the restrictions correctly. Can happen for free calls | |
1994 | * on a completely full ag. | |
1995 | */ | |
d210a28c | 1996 | if (targs.agbno == NULLAGBLOCK) { |
0e1edbd9 NS |
1997 | if (flags & XFS_ALLOC_FLAG_FREEING) |
1998 | break; | |
1999 | xfs_trans_brelse(tp, agflbp); | |
2000 | args->agbp = NULL; | |
2001 | return 0; | |
d210a28c | 2002 | } |
1da177e4 LT |
2003 | /* |
2004 | * Put each allocated block on the list. | |
2005 | */ | |
2006 | for (bno = targs.agbno; bno < targs.agbno + targs.len; bno++) { | |
92821e2b DC |
2007 | error = xfs_alloc_put_freelist(tp, agbp, |
2008 | agflbp, bno, 0); | |
2009 | if (error) | |
1da177e4 LT |
2010 | return error; |
2011 | } | |
2012 | } | |
e63a3690 | 2013 | xfs_trans_brelse(tp, agflbp); |
1da177e4 LT |
2014 | args->agbp = agbp; |
2015 | return 0; | |
2016 | } | |
2017 | ||
2018 | /* | |
2019 | * Get a block from the freelist. | |
2020 | * Returns with the buffer for the block gotten. | |
2021 | */ | |
2022 | int /* error */ | |
2023 | xfs_alloc_get_freelist( | |
2024 | xfs_trans_t *tp, /* transaction pointer */ | |
2025 | xfs_buf_t *agbp, /* buffer containing the agf structure */ | |
92821e2b DC |
2026 | xfs_agblock_t *bnop, /* block address retrieved from freelist */ |
2027 | int btreeblk) /* destination is a AGF btree */ | |
1da177e4 LT |
2028 | { |
2029 | xfs_agf_t *agf; /* a.g. freespace structure */ | |
1da177e4 LT |
2030 | xfs_buf_t *agflbp;/* buffer for a.g. freelist structure */ |
2031 | xfs_agblock_t bno; /* block number returned */ | |
77c95bba | 2032 | __be32 *agfl_bno; |
1da177e4 | 2033 | int error; |
92821e2b | 2034 | int logflags; |
77c95bba | 2035 | xfs_mount_t *mp = tp->t_mountp; |
1da177e4 LT |
2036 | xfs_perag_t *pag; /* per allocation group data */ |
2037 | ||
1da177e4 LT |
2038 | /* |
2039 | * Freelist is empty, give up. | |
2040 | */ | |
77c95bba | 2041 | agf = XFS_BUF_TO_AGF(agbp); |
1da177e4 LT |
2042 | if (!agf->agf_flcount) { |
2043 | *bnop = NULLAGBLOCK; | |
2044 | return 0; | |
2045 | } | |
2046 | /* | |
2047 | * Read the array of free blocks. | |
2048 | */ | |
77c95bba CH |
2049 | error = xfs_alloc_read_agfl(mp, tp, be32_to_cpu(agf->agf_seqno), |
2050 | &agflbp); | |
2051 | if (error) | |
1da177e4 | 2052 | return error; |
77c95bba CH |
2053 | |
2054 | ||
1da177e4 LT |
2055 | /* |
2056 | * Get the block number and update the data structures. | |
2057 | */ | |
77c95bba CH |
2058 | agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp); |
2059 | bno = be32_to_cpu(agfl_bno[be32_to_cpu(agf->agf_flfirst)]); | |
413d57c9 | 2060 | be32_add_cpu(&agf->agf_flfirst, 1); |
1da177e4 | 2061 | xfs_trans_brelse(tp, agflbp); |
16259e7d | 2062 | if (be32_to_cpu(agf->agf_flfirst) == XFS_AGFL_SIZE(mp)) |
1da177e4 | 2063 | agf->agf_flfirst = 0; |
a862e0fd DC |
2064 | |
2065 | pag = xfs_perag_get(mp, be32_to_cpu(agf->agf_seqno)); | |
413d57c9 | 2066 | be32_add_cpu(&agf->agf_flcount, -1); |
1da177e4 LT |
2067 | xfs_trans_agflist_delta(tp, -1); |
2068 | pag->pagf_flcount--; | |
a862e0fd | 2069 | xfs_perag_put(pag); |
92821e2b DC |
2070 | |
2071 | logflags = XFS_AGF_FLFIRST | XFS_AGF_FLCOUNT; | |
2072 | if (btreeblk) { | |
413d57c9 | 2073 | be32_add_cpu(&agf->agf_btreeblks, 1); |
92821e2b DC |
2074 | pag->pagf_btreeblks++; |
2075 | logflags |= XFS_AGF_BTREEBLKS; | |
2076 | } | |
2077 | ||
92821e2b | 2078 | xfs_alloc_log_agf(tp, agbp, logflags); |
1da177e4 LT |
2079 | *bnop = bno; |
2080 | ||
1da177e4 LT |
2081 | return 0; |
2082 | } | |
2083 | ||
2084 | /* | |
2085 | * Log the given fields from the agf structure. | |
2086 | */ | |
2087 | void | |
2088 | xfs_alloc_log_agf( | |
2089 | xfs_trans_t *tp, /* transaction pointer */ | |
2090 | xfs_buf_t *bp, /* buffer for a.g. freelist header */ | |
2091 | int fields) /* mask of fields to be logged (XFS_AGF_...) */ | |
2092 | { | |
2093 | int first; /* first byte offset */ | |
2094 | int last; /* last byte offset */ | |
2095 | static const short offsets[] = { | |
2096 | offsetof(xfs_agf_t, agf_magicnum), | |
2097 | offsetof(xfs_agf_t, agf_versionnum), | |
2098 | offsetof(xfs_agf_t, agf_seqno), | |
2099 | offsetof(xfs_agf_t, agf_length), | |
2100 | offsetof(xfs_agf_t, agf_roots[0]), | |
2101 | offsetof(xfs_agf_t, agf_levels[0]), | |
2102 | offsetof(xfs_agf_t, agf_flfirst), | |
2103 | offsetof(xfs_agf_t, agf_fllast), | |
2104 | offsetof(xfs_agf_t, agf_flcount), | |
2105 | offsetof(xfs_agf_t, agf_freeblks), | |
2106 | offsetof(xfs_agf_t, agf_longest), | |
92821e2b | 2107 | offsetof(xfs_agf_t, agf_btreeblks), |
4e0e6040 | 2108 | offsetof(xfs_agf_t, agf_uuid), |
1da177e4 LT |
2109 | sizeof(xfs_agf_t) |
2110 | }; | |
2111 | ||
0b1b213f CH |
2112 | trace_xfs_agf(tp->t_mountp, XFS_BUF_TO_AGF(bp), fields, _RET_IP_); |
2113 | ||
61fe135c | 2114 | xfs_trans_buf_set_type(tp, bp, XFS_BLFT_AGF_BUF); |
4e0e6040 | 2115 | |
1da177e4 LT |
2116 | xfs_btree_offsets(fields, offsets, XFS_AGF_NUM_BITS, &first, &last); |
2117 | xfs_trans_log_buf(tp, bp, (uint)first, (uint)last); | |
2118 | } | |
2119 | ||
2120 | /* | |
2121 | * Interface for inode allocation to force the pag data to be initialized. | |
2122 | */ | |
2123 | int /* error */ | |
2124 | xfs_alloc_pagf_init( | |
2125 | xfs_mount_t *mp, /* file system mount structure */ | |
2126 | xfs_trans_t *tp, /* transaction pointer */ | |
2127 | xfs_agnumber_t agno, /* allocation group number */ | |
2128 | int flags) /* XFS_ALLOC_FLAGS_... */ | |
2129 | { | |
2130 | xfs_buf_t *bp; | |
2131 | int error; | |
2132 | ||
2133 | if ((error = xfs_alloc_read_agf(mp, tp, agno, flags, &bp))) | |
2134 | return error; | |
2135 | if (bp) | |
2136 | xfs_trans_brelse(tp, bp); | |
2137 | return 0; | |
2138 | } | |
2139 | ||
2140 | /* | |
2141 | * Put the block on the freelist for the allocation group. | |
2142 | */ | |
2143 | int /* error */ | |
2144 | xfs_alloc_put_freelist( | |
2145 | xfs_trans_t *tp, /* transaction pointer */ | |
2146 | xfs_buf_t *agbp, /* buffer for a.g. freelist header */ | |
2147 | xfs_buf_t *agflbp,/* buffer for a.g. free block array */ | |
92821e2b DC |
2148 | xfs_agblock_t bno, /* block being freed */ |
2149 | int btreeblk) /* block came from a AGF btree */ | |
1da177e4 LT |
2150 | { |
2151 | xfs_agf_t *agf; /* a.g. freespace structure */ | |
e2101005 | 2152 | __be32 *blockp;/* pointer to array entry */ |
1da177e4 | 2153 | int error; |
92821e2b | 2154 | int logflags; |
1da177e4 LT |
2155 | xfs_mount_t *mp; /* mount structure */ |
2156 | xfs_perag_t *pag; /* per allocation group data */ | |
77c95bba CH |
2157 | __be32 *agfl_bno; |
2158 | int startoff; | |
1da177e4 LT |
2159 | |
2160 | agf = XFS_BUF_TO_AGF(agbp); | |
2161 | mp = tp->t_mountp; | |
2162 | ||
2163 | if (!agflbp && (error = xfs_alloc_read_agfl(mp, tp, | |
16259e7d | 2164 | be32_to_cpu(agf->agf_seqno), &agflbp))) |
1da177e4 | 2165 | return error; |
413d57c9 | 2166 | be32_add_cpu(&agf->agf_fllast, 1); |
16259e7d | 2167 | if (be32_to_cpu(agf->agf_fllast) == XFS_AGFL_SIZE(mp)) |
1da177e4 | 2168 | agf->agf_fllast = 0; |
a862e0fd DC |
2169 | |
2170 | pag = xfs_perag_get(mp, be32_to_cpu(agf->agf_seqno)); | |
413d57c9 | 2171 | be32_add_cpu(&agf->agf_flcount, 1); |
1da177e4 LT |
2172 | xfs_trans_agflist_delta(tp, 1); |
2173 | pag->pagf_flcount++; | |
92821e2b DC |
2174 | |
2175 | logflags = XFS_AGF_FLLAST | XFS_AGF_FLCOUNT; | |
2176 | if (btreeblk) { | |
413d57c9 | 2177 | be32_add_cpu(&agf->agf_btreeblks, -1); |
92821e2b DC |
2178 | pag->pagf_btreeblks--; |
2179 | logflags |= XFS_AGF_BTREEBLKS; | |
2180 | } | |
a862e0fd | 2181 | xfs_perag_put(pag); |
92821e2b | 2182 | |
92821e2b DC |
2183 | xfs_alloc_log_agf(tp, agbp, logflags); |
2184 | ||
16259e7d | 2185 | ASSERT(be32_to_cpu(agf->agf_flcount) <= XFS_AGFL_SIZE(mp)); |
77c95bba CH |
2186 | |
2187 | agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp); | |
2188 | blockp = &agfl_bno[be32_to_cpu(agf->agf_fllast)]; | |
e2101005 | 2189 | *blockp = cpu_to_be32(bno); |
77c95bba CH |
2190 | startoff = (char *)blockp - (char *)agflbp->b_addr; |
2191 | ||
92821e2b | 2192 | xfs_alloc_log_agf(tp, agbp, logflags); |
77c95bba | 2193 | |
61fe135c | 2194 | xfs_trans_buf_set_type(tp, agflbp, XFS_BLFT_AGFL_BUF); |
77c95bba CH |
2195 | xfs_trans_log_buf(tp, agflbp, startoff, |
2196 | startoff + sizeof(xfs_agblock_t) - 1); | |
1da177e4 LT |
2197 | return 0; |
2198 | } | |
2199 | ||
4e0e6040 | 2200 | static bool |
612cfbfe | 2201 | xfs_agf_verify( |
4e0e6040 | 2202 | struct xfs_mount *mp, |
5d5f527d DC |
2203 | struct xfs_buf *bp) |
2204 | { | |
4e0e6040 | 2205 | struct xfs_agf *agf = XFS_BUF_TO_AGF(bp); |
5d5f527d | 2206 | |
4e0e6040 DC |
2207 | if (xfs_sb_version_hascrc(&mp->m_sb) && |
2208 | !uuid_equal(&agf->agf_uuid, &mp->m_sb.sb_uuid)) | |
2209 | return false; | |
5d5f527d | 2210 | |
4e0e6040 DC |
2211 | if (!(agf->agf_magicnum == cpu_to_be32(XFS_AGF_MAGIC) && |
2212 | XFS_AGF_GOOD_VERSION(be32_to_cpu(agf->agf_versionnum)) && | |
2213 | be32_to_cpu(agf->agf_freeblks) <= be32_to_cpu(agf->agf_length) && | |
2214 | be32_to_cpu(agf->agf_flfirst) < XFS_AGFL_SIZE(mp) && | |
2215 | be32_to_cpu(agf->agf_fllast) < XFS_AGFL_SIZE(mp) && | |
2216 | be32_to_cpu(agf->agf_flcount) <= XFS_AGFL_SIZE(mp))) | |
2217 | return false; | |
5d5f527d DC |
2218 | |
2219 | /* | |
2220 | * during growfs operations, the perag is not fully initialised, | |
2221 | * so we can't use it for any useful checking. growfs ensures we can't | |
2222 | * use it by using uncached buffers that don't have the perag attached | |
2223 | * so we can detect and avoid this problem. | |
2224 | */ | |
4e0e6040 DC |
2225 | if (bp->b_pag && be32_to_cpu(agf->agf_seqno) != bp->b_pag->pag_agno) |
2226 | return false; | |
5d5f527d | 2227 | |
4e0e6040 DC |
2228 | if (xfs_sb_version_haslazysbcount(&mp->m_sb) && |
2229 | be32_to_cpu(agf->agf_btreeblks) > be32_to_cpu(agf->agf_length)) | |
2230 | return false; | |
2231 | ||
2232 | return true;; | |
5d5f527d | 2233 | |
612cfbfe DC |
2234 | } |
2235 | ||
1813dd64 DC |
2236 | static void |
2237 | xfs_agf_read_verify( | |
612cfbfe DC |
2238 | struct xfs_buf *bp) |
2239 | { | |
4e0e6040 DC |
2240 | struct xfs_mount *mp = bp->b_target->bt_mount; |
2241 | int agf_ok = 1; | |
2242 | ||
2243 | if (xfs_sb_version_hascrc(&mp->m_sb)) | |
2244 | agf_ok = xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length), | |
2245 | offsetof(struct xfs_agf, agf_crc)); | |
2246 | ||
2247 | agf_ok = agf_ok && xfs_agf_verify(mp, bp); | |
2248 | ||
2249 | if (unlikely(XFS_TEST_ERROR(!agf_ok, mp, XFS_ERRTAG_ALLOC_READ_AGF, | |
2250 | XFS_RANDOM_ALLOC_READ_AGF))) { | |
2251 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); | |
2252 | xfs_buf_ioerror(bp, EFSCORRUPTED); | |
2253 | } | |
612cfbfe | 2254 | } |
5d5f527d | 2255 | |
b0f539de | 2256 | static void |
1813dd64 | 2257 | xfs_agf_write_verify( |
612cfbfe DC |
2258 | struct xfs_buf *bp) |
2259 | { | |
4e0e6040 DC |
2260 | struct xfs_mount *mp = bp->b_target->bt_mount; |
2261 | struct xfs_buf_log_item *bip = bp->b_fspriv; | |
2262 | ||
2263 | if (!xfs_agf_verify(mp, bp)) { | |
2264 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); | |
2265 | xfs_buf_ioerror(bp, EFSCORRUPTED); | |
2266 | return; | |
2267 | } | |
2268 | ||
2269 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
2270 | return; | |
2271 | ||
2272 | if (bip) | |
2273 | XFS_BUF_TO_AGF(bp)->agf_lsn = cpu_to_be64(bip->bli_item.li_lsn); | |
2274 | ||
2275 | xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), | |
2276 | offsetof(struct xfs_agf, agf_crc)); | |
5d5f527d DC |
2277 | } |
2278 | ||
1813dd64 DC |
2279 | const struct xfs_buf_ops xfs_agf_buf_ops = { |
2280 | .verify_read = xfs_agf_read_verify, | |
2281 | .verify_write = xfs_agf_write_verify, | |
2282 | }; | |
2283 | ||
1da177e4 LT |
2284 | /* |
2285 | * Read in the allocation group header (free/alloc section). | |
2286 | */ | |
2287 | int /* error */ | |
4805621a FCH |
2288 | xfs_read_agf( |
2289 | struct xfs_mount *mp, /* mount point structure */ | |
2290 | struct xfs_trans *tp, /* transaction pointer */ | |
2291 | xfs_agnumber_t agno, /* allocation group number */ | |
2292 | int flags, /* XFS_BUF_ */ | |
2293 | struct xfs_buf **bpp) /* buffer for the ag freelist header */ | |
1da177e4 | 2294 | { |
1da177e4 LT |
2295 | int error; |
2296 | ||
d123031a DC |
2297 | trace_xfs_read_agf(mp, agno); |
2298 | ||
1da177e4 LT |
2299 | ASSERT(agno != NULLAGNUMBER); |
2300 | error = xfs_trans_read_buf( | |
2301 | mp, tp, mp->m_ddev_targp, | |
2302 | XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), | |
1813dd64 | 2303 | XFS_FSS_TO_BB(mp, 1), flags, bpp, &xfs_agf_buf_ops); |
1da177e4 LT |
2304 | if (error) |
2305 | return error; | |
4805621a | 2306 | if (!*bpp) |
1da177e4 | 2307 | return 0; |
4805621a | 2308 | |
5a52c2a5 | 2309 | ASSERT(!(*bpp)->b_error); |
38f23232 | 2310 | xfs_buf_set_ref(*bpp, XFS_AGF_REF); |
4805621a FCH |
2311 | return 0; |
2312 | } | |
2313 | ||
2314 | /* | |
2315 | * Read in the allocation group header (free/alloc section). | |
2316 | */ | |
2317 | int /* error */ | |
2318 | xfs_alloc_read_agf( | |
2319 | struct xfs_mount *mp, /* mount point structure */ | |
2320 | struct xfs_trans *tp, /* transaction pointer */ | |
2321 | xfs_agnumber_t agno, /* allocation group number */ | |
2322 | int flags, /* XFS_ALLOC_FLAG_... */ | |
2323 | struct xfs_buf **bpp) /* buffer for the ag freelist header */ | |
2324 | { | |
2325 | struct xfs_agf *agf; /* ag freelist header */ | |
2326 | struct xfs_perag *pag; /* per allocation group data */ | |
2327 | int error; | |
2328 | ||
d123031a | 2329 | trace_xfs_alloc_read_agf(mp, agno); |
4805621a | 2330 | |
d123031a | 2331 | ASSERT(agno != NULLAGNUMBER); |
4805621a | 2332 | error = xfs_read_agf(mp, tp, agno, |
0cadda1c | 2333 | (flags & XFS_ALLOC_FLAG_TRYLOCK) ? XBF_TRYLOCK : 0, |
4805621a FCH |
2334 | bpp); |
2335 | if (error) | |
2336 | return error; | |
2337 | if (!*bpp) | |
2338 | return 0; | |
5a52c2a5 | 2339 | ASSERT(!(*bpp)->b_error); |
4805621a FCH |
2340 | |
2341 | agf = XFS_BUF_TO_AGF(*bpp); | |
a862e0fd | 2342 | pag = xfs_perag_get(mp, agno); |
1da177e4 | 2343 | if (!pag->pagf_init) { |
16259e7d | 2344 | pag->pagf_freeblks = be32_to_cpu(agf->agf_freeblks); |
92821e2b | 2345 | pag->pagf_btreeblks = be32_to_cpu(agf->agf_btreeblks); |
16259e7d CH |
2346 | pag->pagf_flcount = be32_to_cpu(agf->agf_flcount); |
2347 | pag->pagf_longest = be32_to_cpu(agf->agf_longest); | |
1da177e4 | 2348 | pag->pagf_levels[XFS_BTNUM_BNOi] = |
16259e7d | 2349 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNOi]); |
1da177e4 | 2350 | pag->pagf_levels[XFS_BTNUM_CNTi] = |
16259e7d | 2351 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi]); |
007c61c6 | 2352 | spin_lock_init(&pag->pagb_lock); |
e57336ff | 2353 | pag->pagb_count = 0; |
ed3b4d6c | 2354 | pag->pagb_tree = RB_ROOT; |
1da177e4 LT |
2355 | pag->pagf_init = 1; |
2356 | } | |
2357 | #ifdef DEBUG | |
2358 | else if (!XFS_FORCED_SHUTDOWN(mp)) { | |
16259e7d | 2359 | ASSERT(pag->pagf_freeblks == be32_to_cpu(agf->agf_freeblks)); |
89b28393 | 2360 | ASSERT(pag->pagf_btreeblks == be32_to_cpu(agf->agf_btreeblks)); |
16259e7d CH |
2361 | ASSERT(pag->pagf_flcount == be32_to_cpu(agf->agf_flcount)); |
2362 | ASSERT(pag->pagf_longest == be32_to_cpu(agf->agf_longest)); | |
1da177e4 | 2363 | ASSERT(pag->pagf_levels[XFS_BTNUM_BNOi] == |
16259e7d | 2364 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNOi])); |
1da177e4 | 2365 | ASSERT(pag->pagf_levels[XFS_BTNUM_CNTi] == |
16259e7d | 2366 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi])); |
1da177e4 LT |
2367 | } |
2368 | #endif | |
a862e0fd | 2369 | xfs_perag_put(pag); |
1da177e4 LT |
2370 | return 0; |
2371 | } | |
2372 | ||
2373 | /* | |
2374 | * Allocate an extent (variable-size). | |
2375 | * Depending on the allocation type, we either look in a single allocation | |
2376 | * group or loop over the allocation groups to find the result. | |
2377 | */ | |
2378 | int /* error */ | |
e04426b9 | 2379 | xfs_alloc_vextent( |
1da177e4 LT |
2380 | xfs_alloc_arg_t *args) /* allocation argument structure */ |
2381 | { | |
2382 | xfs_agblock_t agsize; /* allocation group size */ | |
2383 | int error; | |
2384 | int flags; /* XFS_ALLOC_FLAG_... locking flags */ | |
1da177e4 LT |
2385 | xfs_extlen_t minleft;/* minimum left value, temp copy */ |
2386 | xfs_mount_t *mp; /* mount structure pointer */ | |
2387 | xfs_agnumber_t sagno; /* starting allocation group number */ | |
2388 | xfs_alloctype_t type; /* input allocation type */ | |
2389 | int bump_rotor = 0; | |
2390 | int no_min = 0; | |
2391 | xfs_agnumber_t rotorstep = xfs_rotorstep; /* inode32 agf stepper */ | |
2392 | ||
2393 | mp = args->mp; | |
2394 | type = args->otype = args->type; | |
2395 | args->agbno = NULLAGBLOCK; | |
2396 | /* | |
2397 | * Just fix this up, for the case where the last a.g. is shorter | |
2398 | * (or there's only one a.g.) and the caller couldn't easily figure | |
2399 | * that out (xfs_bmap_alloc). | |
2400 | */ | |
2401 | agsize = mp->m_sb.sb_agblocks; | |
2402 | if (args->maxlen > agsize) | |
2403 | args->maxlen = agsize; | |
2404 | if (args->alignment == 0) | |
2405 | args->alignment = 1; | |
2406 | ASSERT(XFS_FSB_TO_AGNO(mp, args->fsbno) < mp->m_sb.sb_agcount); | |
2407 | ASSERT(XFS_FSB_TO_AGBNO(mp, args->fsbno) < agsize); | |
2408 | ASSERT(args->minlen <= args->maxlen); | |
2409 | ASSERT(args->minlen <= agsize); | |
2410 | ASSERT(args->mod < args->prod); | |
2411 | if (XFS_FSB_TO_AGNO(mp, args->fsbno) >= mp->m_sb.sb_agcount || | |
2412 | XFS_FSB_TO_AGBNO(mp, args->fsbno) >= agsize || | |
2413 | args->minlen > args->maxlen || args->minlen > agsize || | |
2414 | args->mod >= args->prod) { | |
2415 | args->fsbno = NULLFSBLOCK; | |
0b1b213f | 2416 | trace_xfs_alloc_vextent_badargs(args); |
1da177e4 LT |
2417 | return 0; |
2418 | } | |
2419 | minleft = args->minleft; | |
2420 | ||
2421 | switch (type) { | |
2422 | case XFS_ALLOCTYPE_THIS_AG: | |
2423 | case XFS_ALLOCTYPE_NEAR_BNO: | |
2424 | case XFS_ALLOCTYPE_THIS_BNO: | |
2425 | /* | |
2426 | * These three force us into a single a.g. | |
2427 | */ | |
2428 | args->agno = XFS_FSB_TO_AGNO(mp, args->fsbno); | |
a862e0fd | 2429 | args->pag = xfs_perag_get(mp, args->agno); |
1da177e4 LT |
2430 | args->minleft = 0; |
2431 | error = xfs_alloc_fix_freelist(args, 0); | |
2432 | args->minleft = minleft; | |
2433 | if (error) { | |
0b1b213f | 2434 | trace_xfs_alloc_vextent_nofix(args); |
1da177e4 LT |
2435 | goto error0; |
2436 | } | |
2437 | if (!args->agbp) { | |
0b1b213f | 2438 | trace_xfs_alloc_vextent_noagbp(args); |
1da177e4 LT |
2439 | break; |
2440 | } | |
2441 | args->agbno = XFS_FSB_TO_AGBNO(mp, args->fsbno); | |
2442 | if ((error = xfs_alloc_ag_vextent(args))) | |
2443 | goto error0; | |
1da177e4 LT |
2444 | break; |
2445 | case XFS_ALLOCTYPE_START_BNO: | |
2446 | /* | |
2447 | * Try near allocation first, then anywhere-in-ag after | |
2448 | * the first a.g. fails. | |
2449 | */ | |
2450 | if ((args->userdata == XFS_ALLOC_INITIAL_USER_DATA) && | |
2451 | (mp->m_flags & XFS_MOUNT_32BITINODES)) { | |
2452 | args->fsbno = XFS_AGB_TO_FSB(mp, | |
2453 | ((mp->m_agfrotor / rotorstep) % | |
2454 | mp->m_sb.sb_agcount), 0); | |
2455 | bump_rotor = 1; | |
2456 | } | |
2457 | args->agbno = XFS_FSB_TO_AGBNO(mp, args->fsbno); | |
2458 | args->type = XFS_ALLOCTYPE_NEAR_BNO; | |
2459 | /* FALLTHROUGH */ | |
2460 | case XFS_ALLOCTYPE_ANY_AG: | |
2461 | case XFS_ALLOCTYPE_START_AG: | |
2462 | case XFS_ALLOCTYPE_FIRST_AG: | |
2463 | /* | |
2464 | * Rotate through the allocation groups looking for a winner. | |
2465 | */ | |
2466 | if (type == XFS_ALLOCTYPE_ANY_AG) { | |
2467 | /* | |
2468 | * Start with the last place we left off. | |
2469 | */ | |
2470 | args->agno = sagno = (mp->m_agfrotor / rotorstep) % | |
2471 | mp->m_sb.sb_agcount; | |
2472 | args->type = XFS_ALLOCTYPE_THIS_AG; | |
2473 | flags = XFS_ALLOC_FLAG_TRYLOCK; | |
2474 | } else if (type == XFS_ALLOCTYPE_FIRST_AG) { | |
2475 | /* | |
2476 | * Start with allocation group given by bno. | |
2477 | */ | |
2478 | args->agno = XFS_FSB_TO_AGNO(mp, args->fsbno); | |
2479 | args->type = XFS_ALLOCTYPE_THIS_AG; | |
2480 | sagno = 0; | |
2481 | flags = 0; | |
2482 | } else { | |
2483 | if (type == XFS_ALLOCTYPE_START_AG) | |
2484 | args->type = XFS_ALLOCTYPE_THIS_AG; | |
2485 | /* | |
2486 | * Start with the given allocation group. | |
2487 | */ | |
2488 | args->agno = sagno = XFS_FSB_TO_AGNO(mp, args->fsbno); | |
2489 | flags = XFS_ALLOC_FLAG_TRYLOCK; | |
2490 | } | |
2491 | /* | |
2492 | * Loop over allocation groups twice; first time with | |
2493 | * trylock set, second time without. | |
2494 | */ | |
1da177e4 | 2495 | for (;;) { |
a862e0fd | 2496 | args->pag = xfs_perag_get(mp, args->agno); |
1da177e4 LT |
2497 | if (no_min) args->minleft = 0; |
2498 | error = xfs_alloc_fix_freelist(args, flags); | |
2499 | args->minleft = minleft; | |
2500 | if (error) { | |
0b1b213f | 2501 | trace_xfs_alloc_vextent_nofix(args); |
1da177e4 LT |
2502 | goto error0; |
2503 | } | |
2504 | /* | |
2505 | * If we get a buffer back then the allocation will fly. | |
2506 | */ | |
2507 | if (args->agbp) { | |
2508 | if ((error = xfs_alloc_ag_vextent(args))) | |
2509 | goto error0; | |
2510 | break; | |
2511 | } | |
0b1b213f CH |
2512 | |
2513 | trace_xfs_alloc_vextent_loopfailed(args); | |
2514 | ||
1da177e4 LT |
2515 | /* |
2516 | * Didn't work, figure out the next iteration. | |
2517 | */ | |
2518 | if (args->agno == sagno && | |
2519 | type == XFS_ALLOCTYPE_START_BNO) | |
2520 | args->type = XFS_ALLOCTYPE_THIS_AG; | |
d210a28c YL |
2521 | /* |
2522 | * For the first allocation, we can try any AG to get | |
2523 | * space. However, if we already have allocated a | |
2524 | * block, we don't want to try AGs whose number is below | |
2525 | * sagno. Otherwise, we may end up with out-of-order | |
2526 | * locking of AGF, which might cause deadlock. | |
2527 | */ | |
2528 | if (++(args->agno) == mp->m_sb.sb_agcount) { | |
2529 | if (args->firstblock != NULLFSBLOCK) | |
2530 | args->agno = sagno; | |
2531 | else | |
2532 | args->agno = 0; | |
2533 | } | |
1da177e4 LT |
2534 | /* |
2535 | * Reached the starting a.g., must either be done | |
2536 | * or switch to non-trylock mode. | |
2537 | */ | |
2538 | if (args->agno == sagno) { | |
2539 | if (no_min == 1) { | |
2540 | args->agbno = NULLAGBLOCK; | |
0b1b213f | 2541 | trace_xfs_alloc_vextent_allfailed(args); |
1da177e4 LT |
2542 | break; |
2543 | } | |
2544 | if (flags == 0) { | |
2545 | no_min = 1; | |
2546 | } else { | |
2547 | flags = 0; | |
2548 | if (type == XFS_ALLOCTYPE_START_BNO) { | |
2549 | args->agbno = XFS_FSB_TO_AGBNO(mp, | |
2550 | args->fsbno); | |
2551 | args->type = XFS_ALLOCTYPE_NEAR_BNO; | |
2552 | } | |
2553 | } | |
2554 | } | |
a862e0fd | 2555 | xfs_perag_put(args->pag); |
1da177e4 | 2556 | } |
1da177e4 LT |
2557 | if (bump_rotor || (type == XFS_ALLOCTYPE_ANY_AG)) { |
2558 | if (args->agno == sagno) | |
2559 | mp->m_agfrotor = (mp->m_agfrotor + 1) % | |
2560 | (mp->m_sb.sb_agcount * rotorstep); | |
2561 | else | |
2562 | mp->m_agfrotor = (args->agno * rotorstep + 1) % | |
2563 | (mp->m_sb.sb_agcount * rotorstep); | |
2564 | } | |
2565 | break; | |
2566 | default: | |
2567 | ASSERT(0); | |
2568 | /* NOTREACHED */ | |
2569 | } | |
2570 | if (args->agbno == NULLAGBLOCK) | |
2571 | args->fsbno = NULLFSBLOCK; | |
2572 | else { | |
2573 | args->fsbno = XFS_AGB_TO_FSB(mp, args->agno, args->agbno); | |
2574 | #ifdef DEBUG | |
2575 | ASSERT(args->len >= args->minlen); | |
2576 | ASSERT(args->len <= args->maxlen); | |
2577 | ASSERT(args->agbno % args->alignment == 0); | |
2578 | XFS_AG_CHECK_DADDR(mp, XFS_FSB_TO_DADDR(mp, args->fsbno), | |
2579 | args->len); | |
2580 | #endif | |
2581 | } | |
a862e0fd | 2582 | xfs_perag_put(args->pag); |
1da177e4 LT |
2583 | return 0; |
2584 | error0: | |
a862e0fd | 2585 | xfs_perag_put(args->pag); |
1da177e4 LT |
2586 | return error; |
2587 | } | |
2588 | ||
2589 | /* | |
2590 | * Free an extent. | |
2591 | * Just break up the extent address and hand off to xfs_free_ag_extent | |
2592 | * after fixing up the freelist. | |
2593 | */ | |
2594 | int /* error */ | |
2595 | xfs_free_extent( | |
2596 | xfs_trans_t *tp, /* transaction pointer */ | |
2597 | xfs_fsblock_t bno, /* starting block number of extent */ | |
2598 | xfs_extlen_t len) /* length of extent */ | |
2599 | { | |
0e1edbd9 | 2600 | xfs_alloc_arg_t args; |
1da177e4 LT |
2601 | int error; |
2602 | ||
2603 | ASSERT(len != 0); | |
0e1edbd9 | 2604 | memset(&args, 0, sizeof(xfs_alloc_arg_t)); |
1da177e4 LT |
2605 | args.tp = tp; |
2606 | args.mp = tp->t_mountp; | |
be65b18a DC |
2607 | |
2608 | /* | |
2609 | * validate that the block number is legal - the enables us to detect | |
2610 | * and handle a silent filesystem corruption rather than crashing. | |
2611 | */ | |
1da177e4 | 2612 | args.agno = XFS_FSB_TO_AGNO(args.mp, bno); |
be65b18a DC |
2613 | if (args.agno >= args.mp->m_sb.sb_agcount) |
2614 | return EFSCORRUPTED; | |
2615 | ||
1da177e4 | 2616 | args.agbno = XFS_FSB_TO_AGBNO(args.mp, bno); |
be65b18a DC |
2617 | if (args.agbno >= args.mp->m_sb.sb_agblocks) |
2618 | return EFSCORRUPTED; | |
2619 | ||
a862e0fd | 2620 | args.pag = xfs_perag_get(args.mp, args.agno); |
be65b18a DC |
2621 | ASSERT(args.pag); |
2622 | ||
2623 | error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING); | |
2624 | if (error) | |
1da177e4 | 2625 | goto error0; |
be65b18a DC |
2626 | |
2627 | /* validate the extent size is legal now we have the agf locked */ | |
2628 | if (args.agbno + len > | |
2629 | be32_to_cpu(XFS_BUF_TO_AGF(args.agbp)->agf_length)) { | |
2630 | error = EFSCORRUPTED; | |
2631 | goto error0; | |
2632 | } | |
2633 | ||
0e1edbd9 | 2634 | error = xfs_free_ag_extent(tp, args.agbp, args.agno, args.agbno, len, 0); |
a870acd9 | 2635 | if (!error) |
4ecbfe63 | 2636 | xfs_extent_busy_insert(tp, args.agno, args.agbno, len, 0); |
1da177e4 | 2637 | error0: |
a862e0fd | 2638 | xfs_perag_put(args.pag); |
1da177e4 LT |
2639 | return error; |
2640 | } |