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0b61f8a4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
7b718769 NS |
3 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
4 | * All Rights Reserved. | |
1da177e4 | 5 | */ |
1da177e4 | 6 | #include "xfs.h" |
a844f451 | 7 | #include "xfs_fs.h" |
70a9883c | 8 | #include "xfs_format.h" |
239880ef | 9 | #include "xfs_log_format.h" |
70a9883c | 10 | #include "xfs_shared.h" |
239880ef | 11 | #include "xfs_trans_resv.h" |
a844f451 | 12 | #include "xfs_bit.h" |
1da177e4 | 13 | #include "xfs_sb.h" |
1da177e4 | 14 | #include "xfs_mount.h" |
3ab78df2 | 15 | #include "xfs_defer.h" |
a844f451 | 16 | #include "xfs_inode.h" |
1da177e4 | 17 | #include "xfs_btree.h" |
673930c3 | 18 | #include "xfs_rmap.h" |
a4fbe6ab | 19 | #include "xfs_alloc_btree.h" |
1da177e4 | 20 | #include "xfs_alloc.h" |
efc27b52 | 21 | #include "xfs_extent_busy.h" |
e9e899a2 | 22 | #include "xfs_errortag.h" |
1da177e4 | 23 | #include "xfs_error.h" |
4e0e6040 | 24 | #include "xfs_cksum.h" |
0b1b213f | 25 | #include "xfs_trace.h" |
239880ef | 26 | #include "xfs_trans.h" |
4e0e6040 | 27 | #include "xfs_buf_item.h" |
239880ef | 28 | #include "xfs_log.h" |
3fd129b6 | 29 | #include "xfs_ag_resv.h" |
f8f2835a BF |
30 | #include "xfs_bmap.h" |
31 | ||
32 | extern kmem_zone_t *xfs_bmap_free_item_zone; | |
1da177e4 | 33 | |
c999a223 | 34 | struct workqueue_struct *xfs_alloc_wq; |
1da177e4 LT |
35 | |
36 | #define XFS_ABSDIFF(a,b) (((a) <= (b)) ? ((b) - (a)) : ((a) - (b))) | |
37 | ||
38 | #define XFSA_FIXUP_BNO_OK 1 | |
39 | #define XFSA_FIXUP_CNT_OK 2 | |
40 | ||
1da177e4 LT |
41 | STATIC int xfs_alloc_ag_vextent_exact(xfs_alloc_arg_t *); |
42 | STATIC int xfs_alloc_ag_vextent_near(xfs_alloc_arg_t *); | |
43 | STATIC int xfs_alloc_ag_vextent_size(xfs_alloc_arg_t *); | |
1da177e4 | 44 | |
a78ee256 DC |
45 | /* |
46 | * Size of the AGFL. For CRC-enabled filesystes we steal a couple of slots in | |
47 | * the beginning of the block for a proper header with the location information | |
48 | * and CRC. | |
49 | */ | |
50 | unsigned int | |
51 | xfs_agfl_size( | |
52 | struct xfs_mount *mp) | |
53 | { | |
54 | unsigned int size = mp->m_sb.sb_sectsize; | |
55 | ||
56 | if (xfs_sb_version_hascrc(&mp->m_sb)) | |
57 | size -= sizeof(struct xfs_agfl); | |
58 | ||
59 | return size / sizeof(xfs_agblock_t); | |
60 | } | |
61 | ||
af30dfa1 DW |
62 | unsigned int |
63 | xfs_refc_block( | |
64 | struct xfs_mount *mp) | |
65 | { | |
66 | if (xfs_sb_version_hasrmapbt(&mp->m_sb)) | |
67 | return XFS_RMAP_BLOCK(mp) + 1; | |
68 | if (xfs_sb_version_hasfinobt(&mp->m_sb)) | |
69 | return XFS_FIBT_BLOCK(mp) + 1; | |
70 | return XFS_IBT_BLOCK(mp) + 1; | |
71 | } | |
72 | ||
8018026e DW |
73 | xfs_extlen_t |
74 | xfs_prealloc_blocks( | |
75 | struct xfs_mount *mp) | |
76 | { | |
af30dfa1 DW |
77 | if (xfs_sb_version_hasreflink(&mp->m_sb)) |
78 | return xfs_refc_block(mp) + 1; | |
8018026e DW |
79 | if (xfs_sb_version_hasrmapbt(&mp->m_sb)) |
80 | return XFS_RMAP_BLOCK(mp) + 1; | |
81 | if (xfs_sb_version_hasfinobt(&mp->m_sb)) | |
82 | return XFS_FIBT_BLOCK(mp) + 1; | |
83 | return XFS_IBT_BLOCK(mp) + 1; | |
84 | } | |
85 | ||
52548852 DW |
86 | /* |
87 | * In order to avoid ENOSPC-related deadlock caused by out-of-order locking of | |
88 | * AGF buffer (PV 947395), we place constraints on the relationship among | |
89 | * actual allocations for data blocks, freelist blocks, and potential file data | |
90 | * bmap btree blocks. However, these restrictions may result in no actual space | |
91 | * allocated for a delayed extent, for example, a data block in a certain AG is | |
92 | * allocated but there is no additional block for the additional bmap btree | |
93 | * block due to a split of the bmap btree of the file. The result of this may | |
94 | * lead to an infinite loop when the file gets flushed to disk and all delayed | |
95 | * extents need to be actually allocated. To get around this, we explicitly set | |
96 | * aside a few blocks which will not be reserved in delayed allocation. | |
97 | * | |
3fd129b6 DW |
98 | * We need to reserve 4 fsbs _per AG_ for the freelist and 4 more to handle a |
99 | * potential split of the file's bmap btree. | |
52548852 DW |
100 | */ |
101 | unsigned int | |
102 | xfs_alloc_set_aside( | |
103 | struct xfs_mount *mp) | |
104 | { | |
5149fd32 | 105 | return mp->m_sb.sb_agcount * (XFS_ALLOC_AGFL_RESERVE + 4); |
52548852 DW |
106 | } |
107 | ||
108 | /* | |
109 | * When deciding how much space to allocate out of an AG, we limit the | |
110 | * allocation maximum size to the size the AG. However, we cannot use all the | |
111 | * blocks in the AG - some are permanently used by metadata. These | |
112 | * blocks are generally: | |
113 | * - the AG superblock, AGF, AGI and AGFL | |
114 | * - the AGF (bno and cnt) and AGI btree root blocks, and optionally | |
115 | * the AGI free inode and rmap btree root blocks. | |
116 | * - blocks on the AGFL according to xfs_alloc_set_aside() limits | |
117 | * - the rmapbt root block | |
118 | * | |
119 | * The AG headers are sector sized, so the amount of space they take up is | |
120 | * dependent on filesystem geometry. The others are all single blocks. | |
121 | */ | |
122 | unsigned int | |
123 | xfs_alloc_ag_max_usable( | |
124 | struct xfs_mount *mp) | |
125 | { | |
126 | unsigned int blocks; | |
127 | ||
128 | blocks = XFS_BB_TO_FSB(mp, XFS_FSS_TO_BB(mp, 4)); /* ag headers */ | |
129 | blocks += XFS_ALLOC_AGFL_RESERVE; | |
130 | blocks += 3; /* AGF, AGI btree root blocks */ | |
131 | if (xfs_sb_version_hasfinobt(&mp->m_sb)) | |
132 | blocks++; /* finobt root block */ | |
133 | if (xfs_sb_version_hasrmapbt(&mp->m_sb)) | |
134 | blocks++; /* rmap root block */ | |
d0e853f3 DW |
135 | if (xfs_sb_version_hasreflink(&mp->m_sb)) |
136 | blocks++; /* refcount root block */ | |
52548852 DW |
137 | |
138 | return mp->m_sb.sb_agblocks - blocks; | |
139 | } | |
140 | ||
fe033cc8 CH |
141 | /* |
142 | * Lookup the record equal to [bno, len] in the btree given by cur. | |
143 | */ | |
144 | STATIC int /* error */ | |
145 | xfs_alloc_lookup_eq( | |
146 | struct xfs_btree_cur *cur, /* btree cursor */ | |
147 | xfs_agblock_t bno, /* starting block of extent */ | |
148 | xfs_extlen_t len, /* length of extent */ | |
149 | int *stat) /* success/failure */ | |
150 | { | |
151 | cur->bc_rec.a.ar_startblock = bno; | |
152 | cur->bc_rec.a.ar_blockcount = len; | |
153 | return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat); | |
154 | } | |
155 | ||
156 | /* | |
157 | * Lookup the first record greater than or equal to [bno, len] | |
158 | * in the btree given by cur. | |
159 | */ | |
a66d6363 | 160 | int /* error */ |
fe033cc8 CH |
161 | xfs_alloc_lookup_ge( |
162 | struct xfs_btree_cur *cur, /* btree cursor */ | |
163 | xfs_agblock_t bno, /* starting block of extent */ | |
164 | xfs_extlen_t len, /* length of extent */ | |
165 | int *stat) /* success/failure */ | |
166 | { | |
167 | cur->bc_rec.a.ar_startblock = bno; | |
168 | cur->bc_rec.a.ar_blockcount = len; | |
169 | return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat); | |
170 | } | |
171 | ||
172 | /* | |
173 | * Lookup the first record less than or equal to [bno, len] | |
174 | * in the btree given by cur. | |
175 | */ | |
ce1d802e | 176 | int /* error */ |
fe033cc8 CH |
177 | xfs_alloc_lookup_le( |
178 | struct xfs_btree_cur *cur, /* btree cursor */ | |
179 | xfs_agblock_t bno, /* starting block of extent */ | |
180 | xfs_extlen_t len, /* length of extent */ | |
181 | int *stat) /* success/failure */ | |
182 | { | |
183 | cur->bc_rec.a.ar_startblock = bno; | |
184 | cur->bc_rec.a.ar_blockcount = len; | |
185 | return xfs_btree_lookup(cur, XFS_LOOKUP_LE, stat); | |
186 | } | |
187 | ||
278d0ca1 CH |
188 | /* |
189 | * Update the record referred to by cur to the value given | |
190 | * by [bno, len]. | |
191 | * This either works (return 0) or gets an EFSCORRUPTED error. | |
192 | */ | |
193 | STATIC int /* error */ | |
194 | xfs_alloc_update( | |
195 | struct xfs_btree_cur *cur, /* btree cursor */ | |
196 | xfs_agblock_t bno, /* starting block of extent */ | |
197 | xfs_extlen_t len) /* length of extent */ | |
198 | { | |
199 | union xfs_btree_rec rec; | |
200 | ||
201 | rec.alloc.ar_startblock = cpu_to_be32(bno); | |
202 | rec.alloc.ar_blockcount = cpu_to_be32(len); | |
203 | return xfs_btree_update(cur, &rec); | |
204 | } | |
fe033cc8 | 205 | |
8cc938fe CH |
206 | /* |
207 | * Get the data from the pointed-to record. | |
208 | */ | |
a46db608 | 209 | int /* error */ |
8cc938fe CH |
210 | xfs_alloc_get_rec( |
211 | struct xfs_btree_cur *cur, /* btree cursor */ | |
212 | xfs_agblock_t *bno, /* output: starting block of extent */ | |
213 | xfs_extlen_t *len, /* output: length of extent */ | |
214 | int *stat) /* output: success/failure */ | |
215 | { | |
9e6c08d4 DC |
216 | struct xfs_mount *mp = cur->bc_mp; |
217 | xfs_agnumber_t agno = cur->bc_private.a.agno; | |
8cc938fe CH |
218 | union xfs_btree_rec *rec; |
219 | int error; | |
220 | ||
221 | error = xfs_btree_get_rec(cur, &rec, stat); | |
a37f7b12 DW |
222 | if (error || !(*stat)) |
223 | return error; | |
a37f7b12 DW |
224 | |
225 | *bno = be32_to_cpu(rec->alloc.ar_startblock); | |
226 | *len = be32_to_cpu(rec->alloc.ar_blockcount); | |
227 | ||
efe80327 CM |
228 | if (*len == 0) |
229 | goto out_bad_rec; | |
230 | ||
9e6c08d4 DC |
231 | /* check for valid extent range, including overflow */ |
232 | if (!xfs_verify_agbno(mp, agno, *bno)) | |
233 | goto out_bad_rec; | |
234 | if (*bno > *bno + *len) | |
235 | goto out_bad_rec; | |
236 | if (!xfs_verify_agbno(mp, agno, *bno + *len - 1)) | |
237 | goto out_bad_rec; | |
238 | ||
239 | return 0; | |
240 | ||
241 | out_bad_rec: | |
242 | xfs_warn(mp, | |
243 | "%s Freespace BTree record corruption in AG %d detected!", | |
244 | cur->bc_btnum == XFS_BTNUM_BNO ? "Block" : "Size", agno); | |
245 | xfs_warn(mp, | |
246 | "start block 0x%x block count 0x%x", *bno, *len); | |
247 | return -EFSCORRUPTED; | |
8cc938fe CH |
248 | } |
249 | ||
1da177e4 LT |
250 | /* |
251 | * Compute aligned version of the found extent. | |
252 | * Takes alignment and min length into account. | |
253 | */ | |
ebf55872 | 254 | STATIC bool |
1da177e4 | 255 | xfs_alloc_compute_aligned( |
86fa8af6 | 256 | xfs_alloc_arg_t *args, /* allocation argument structure */ |
1da177e4 LT |
257 | xfs_agblock_t foundbno, /* starting block in found extent */ |
258 | xfs_extlen_t foundlen, /* length in found extent */ | |
1da177e4 | 259 | xfs_agblock_t *resbno, /* result block number */ |
ebf55872 CH |
260 | xfs_extlen_t *reslen, /* result length */ |
261 | unsigned *busy_gen) | |
1da177e4 | 262 | { |
ebf55872 CH |
263 | xfs_agblock_t bno = foundbno; |
264 | xfs_extlen_t len = foundlen; | |
bfe46d4e | 265 | xfs_extlen_t diff; |
ebf55872 | 266 | bool busy; |
1da177e4 | 267 | |
e26f0501 | 268 | /* Trim busy sections out of found extent */ |
ebf55872 | 269 | busy = xfs_extent_busy_trim(args, &bno, &len, busy_gen); |
e26f0501 | 270 | |
bfe46d4e BF |
271 | /* |
272 | * If we have a largish extent that happens to start before min_agbno, | |
273 | * see if we can shift it into range... | |
274 | */ | |
275 | if (bno < args->min_agbno && bno + len > args->min_agbno) { | |
276 | diff = args->min_agbno - bno; | |
277 | if (len > diff) { | |
278 | bno += diff; | |
279 | len -= diff; | |
280 | } | |
281 | } | |
282 | ||
e26f0501 CH |
283 | if (args->alignment > 1 && len >= args->minlen) { |
284 | xfs_agblock_t aligned_bno = roundup(bno, args->alignment); | |
bfe46d4e BF |
285 | |
286 | diff = aligned_bno - bno; | |
e26f0501 CH |
287 | |
288 | *resbno = aligned_bno; | |
289 | *reslen = diff >= len ? 0 : len - diff; | |
1da177e4 | 290 | } else { |
e26f0501 CH |
291 | *resbno = bno; |
292 | *reslen = len; | |
1da177e4 | 293 | } |
ebf55872 CH |
294 | |
295 | return busy; | |
1da177e4 LT |
296 | } |
297 | ||
298 | /* | |
299 | * Compute best start block and diff for "near" allocations. | |
300 | * freelen >= wantlen already checked by caller. | |
301 | */ | |
302 | STATIC xfs_extlen_t /* difference value (absolute) */ | |
303 | xfs_alloc_compute_diff( | |
304 | xfs_agblock_t wantbno, /* target starting block */ | |
305 | xfs_extlen_t wantlen, /* target length */ | |
306 | xfs_extlen_t alignment, /* target alignment */ | |
292378ed | 307 | int datatype, /* are we allocating data? */ |
1da177e4 LT |
308 | xfs_agblock_t freebno, /* freespace's starting block */ |
309 | xfs_extlen_t freelen, /* freespace's length */ | |
310 | xfs_agblock_t *newbnop) /* result: best start block from free */ | |
311 | { | |
312 | xfs_agblock_t freeend; /* end of freespace extent */ | |
313 | xfs_agblock_t newbno1; /* return block number */ | |
314 | xfs_agblock_t newbno2; /* other new block number */ | |
315 | xfs_extlen_t newlen1=0; /* length with newbno1 */ | |
316 | xfs_extlen_t newlen2=0; /* length with newbno2 */ | |
317 | xfs_agblock_t wantend; /* end of target extent */ | |
292378ed | 318 | bool userdata = xfs_alloc_is_userdata(datatype); |
1da177e4 LT |
319 | |
320 | ASSERT(freelen >= wantlen); | |
321 | freeend = freebno + freelen; | |
322 | wantend = wantbno + wantlen; | |
211d022c JK |
323 | /* |
324 | * We want to allocate from the start of a free extent if it is past | |
325 | * the desired block or if we are allocating user data and the free | |
326 | * extent is before desired block. The second case is there to allow | |
327 | * for contiguous allocation from the remaining free space if the file | |
328 | * grows in the short term. | |
329 | */ | |
330 | if (freebno >= wantbno || (userdata && freeend < wantend)) { | |
1da177e4 LT |
331 | if ((newbno1 = roundup(freebno, alignment)) >= freeend) |
332 | newbno1 = NULLAGBLOCK; | |
333 | } else if (freeend >= wantend && alignment > 1) { | |
334 | newbno1 = roundup(wantbno, alignment); | |
335 | newbno2 = newbno1 - alignment; | |
336 | if (newbno1 >= freeend) | |
337 | newbno1 = NULLAGBLOCK; | |
338 | else | |
339 | newlen1 = XFS_EXTLEN_MIN(wantlen, freeend - newbno1); | |
340 | if (newbno2 < freebno) | |
341 | newbno2 = NULLAGBLOCK; | |
342 | else | |
343 | newlen2 = XFS_EXTLEN_MIN(wantlen, freeend - newbno2); | |
344 | if (newbno1 != NULLAGBLOCK && newbno2 != NULLAGBLOCK) { | |
345 | if (newlen1 < newlen2 || | |
346 | (newlen1 == newlen2 && | |
347 | XFS_ABSDIFF(newbno1, wantbno) > | |
348 | XFS_ABSDIFF(newbno2, wantbno))) | |
349 | newbno1 = newbno2; | |
350 | } else if (newbno2 != NULLAGBLOCK) | |
351 | newbno1 = newbno2; | |
352 | } else if (freeend >= wantend) { | |
353 | newbno1 = wantbno; | |
354 | } else if (alignment > 1) { | |
355 | newbno1 = roundup(freeend - wantlen, alignment); | |
356 | if (newbno1 > freeend - wantlen && | |
357 | newbno1 - alignment >= freebno) | |
358 | newbno1 -= alignment; | |
359 | else if (newbno1 >= freeend) | |
360 | newbno1 = NULLAGBLOCK; | |
361 | } else | |
362 | newbno1 = freeend - wantlen; | |
363 | *newbnop = newbno1; | |
364 | return newbno1 == NULLAGBLOCK ? 0 : XFS_ABSDIFF(newbno1, wantbno); | |
365 | } | |
366 | ||
367 | /* | |
368 | * Fix up the length, based on mod and prod. | |
369 | * len should be k * prod + mod for some k. | |
370 | * If len is too small it is returned unchanged. | |
371 | * If len hits maxlen it is left alone. | |
372 | */ | |
373 | STATIC void | |
374 | xfs_alloc_fix_len( | |
375 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
376 | { | |
377 | xfs_extlen_t k; | |
378 | xfs_extlen_t rlen; | |
379 | ||
380 | ASSERT(args->mod < args->prod); | |
381 | rlen = args->len; | |
382 | ASSERT(rlen >= args->minlen); | |
383 | ASSERT(rlen <= args->maxlen); | |
384 | if (args->prod <= 1 || rlen < args->mod || rlen == args->maxlen || | |
385 | (args->mod == 0 && rlen < args->prod)) | |
386 | return; | |
387 | k = rlen % args->prod; | |
388 | if (k == args->mod) | |
389 | return; | |
30265117 JK |
390 | if (k > args->mod) |
391 | rlen = rlen - (k - args->mod); | |
392 | else | |
393 | rlen = rlen - args->prod + (args->mod - k); | |
3790a8cd | 394 | /* casts to (int) catch length underflows */ |
30265117 JK |
395 | if ((int)rlen < (int)args->minlen) |
396 | return; | |
397 | ASSERT(rlen >= args->minlen && rlen <= args->maxlen); | |
398 | ASSERT(rlen % args->prod == args->mod); | |
54fee133 CH |
399 | ASSERT(args->pag->pagf_freeblks + args->pag->pagf_flcount >= |
400 | rlen + args->minleft); | |
1da177e4 LT |
401 | args->len = rlen; |
402 | } | |
403 | ||
1da177e4 LT |
404 | /* |
405 | * Update the two btrees, logically removing from freespace the extent | |
406 | * starting at rbno, rlen blocks. The extent is contained within the | |
407 | * actual (current) free extent fbno for flen blocks. | |
408 | * Flags are passed in indicating whether the cursors are set to the | |
409 | * relevant records. | |
410 | */ | |
411 | STATIC int /* error code */ | |
412 | xfs_alloc_fixup_trees( | |
413 | xfs_btree_cur_t *cnt_cur, /* cursor for by-size btree */ | |
414 | xfs_btree_cur_t *bno_cur, /* cursor for by-block btree */ | |
415 | xfs_agblock_t fbno, /* starting block of free extent */ | |
416 | xfs_extlen_t flen, /* length of free extent */ | |
417 | xfs_agblock_t rbno, /* starting block of returned extent */ | |
418 | xfs_extlen_t rlen, /* length of returned extent */ | |
419 | int flags) /* flags, XFSA_FIXUP_... */ | |
420 | { | |
421 | int error; /* error code */ | |
422 | int i; /* operation results */ | |
423 | xfs_agblock_t nfbno1; /* first new free startblock */ | |
424 | xfs_agblock_t nfbno2; /* second new free startblock */ | |
425 | xfs_extlen_t nflen1=0; /* first new free length */ | |
426 | xfs_extlen_t nflen2=0; /* second new free length */ | |
5fb5aeee ES |
427 | struct xfs_mount *mp; |
428 | ||
429 | mp = cnt_cur->bc_mp; | |
1da177e4 LT |
430 | |
431 | /* | |
432 | * Look up the record in the by-size tree if necessary. | |
433 | */ | |
434 | if (flags & XFSA_FIXUP_CNT_OK) { | |
435 | #ifdef DEBUG | |
436 | if ((error = xfs_alloc_get_rec(cnt_cur, &nfbno1, &nflen1, &i))) | |
437 | return error; | |
5fb5aeee | 438 | XFS_WANT_CORRUPTED_RETURN(mp, |
1da177e4 LT |
439 | i == 1 && nfbno1 == fbno && nflen1 == flen); |
440 | #endif | |
441 | } else { | |
442 | if ((error = xfs_alloc_lookup_eq(cnt_cur, fbno, flen, &i))) | |
443 | return error; | |
5fb5aeee | 444 | XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
1da177e4 LT |
445 | } |
446 | /* | |
447 | * Look up the record in the by-block tree if necessary. | |
448 | */ | |
449 | if (flags & XFSA_FIXUP_BNO_OK) { | |
450 | #ifdef DEBUG | |
451 | if ((error = xfs_alloc_get_rec(bno_cur, &nfbno1, &nflen1, &i))) | |
452 | return error; | |
5fb5aeee | 453 | XFS_WANT_CORRUPTED_RETURN(mp, |
1da177e4 LT |
454 | i == 1 && nfbno1 == fbno && nflen1 == flen); |
455 | #endif | |
456 | } else { | |
457 | if ((error = xfs_alloc_lookup_eq(bno_cur, fbno, flen, &i))) | |
458 | return error; | |
5fb5aeee | 459 | XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
1da177e4 | 460 | } |
7cc95a82 | 461 | |
1da177e4 | 462 | #ifdef DEBUG |
7cc95a82 CH |
463 | if (bno_cur->bc_nlevels == 1 && cnt_cur->bc_nlevels == 1) { |
464 | struct xfs_btree_block *bnoblock; | |
465 | struct xfs_btree_block *cntblock; | |
466 | ||
467 | bnoblock = XFS_BUF_TO_BLOCK(bno_cur->bc_bufs[0]); | |
468 | cntblock = XFS_BUF_TO_BLOCK(cnt_cur->bc_bufs[0]); | |
1da177e4 | 469 | |
5fb5aeee | 470 | XFS_WANT_CORRUPTED_RETURN(mp, |
7cc95a82 | 471 | bnoblock->bb_numrecs == cntblock->bb_numrecs); |
1da177e4 LT |
472 | } |
473 | #endif | |
7cc95a82 | 474 | |
1da177e4 LT |
475 | /* |
476 | * Deal with all four cases: the allocated record is contained | |
477 | * within the freespace record, so we can have new freespace | |
478 | * at either (or both) end, or no freespace remaining. | |
479 | */ | |
480 | if (rbno == fbno && rlen == flen) | |
481 | nfbno1 = nfbno2 = NULLAGBLOCK; | |
482 | else if (rbno == fbno) { | |
483 | nfbno1 = rbno + rlen; | |
484 | nflen1 = flen - rlen; | |
485 | nfbno2 = NULLAGBLOCK; | |
486 | } else if (rbno + rlen == fbno + flen) { | |
487 | nfbno1 = fbno; | |
488 | nflen1 = flen - rlen; | |
489 | nfbno2 = NULLAGBLOCK; | |
490 | } else { | |
491 | nfbno1 = fbno; | |
492 | nflen1 = rbno - fbno; | |
493 | nfbno2 = rbno + rlen; | |
494 | nflen2 = (fbno + flen) - nfbno2; | |
495 | } | |
496 | /* | |
497 | * Delete the entry from the by-size btree. | |
498 | */ | |
91cca5df | 499 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
1da177e4 | 500 | return error; |
5fb5aeee | 501 | XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
1da177e4 LT |
502 | /* |
503 | * Add new by-size btree entry(s). | |
504 | */ | |
505 | if (nfbno1 != NULLAGBLOCK) { | |
506 | if ((error = xfs_alloc_lookup_eq(cnt_cur, nfbno1, nflen1, &i))) | |
507 | return error; | |
5fb5aeee | 508 | XFS_WANT_CORRUPTED_RETURN(mp, i == 0); |
4b22a571 | 509 | if ((error = xfs_btree_insert(cnt_cur, &i))) |
1da177e4 | 510 | return error; |
5fb5aeee | 511 | XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
1da177e4 LT |
512 | } |
513 | if (nfbno2 != NULLAGBLOCK) { | |
514 | if ((error = xfs_alloc_lookup_eq(cnt_cur, nfbno2, nflen2, &i))) | |
515 | return error; | |
5fb5aeee | 516 | XFS_WANT_CORRUPTED_RETURN(mp, i == 0); |
4b22a571 | 517 | if ((error = xfs_btree_insert(cnt_cur, &i))) |
1da177e4 | 518 | return error; |
5fb5aeee | 519 | XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
1da177e4 LT |
520 | } |
521 | /* | |
522 | * Fix up the by-block btree entry(s). | |
523 | */ | |
524 | if (nfbno1 == NULLAGBLOCK) { | |
525 | /* | |
526 | * No remaining freespace, just delete the by-block tree entry. | |
527 | */ | |
91cca5df | 528 | if ((error = xfs_btree_delete(bno_cur, &i))) |
1da177e4 | 529 | return error; |
5fb5aeee | 530 | XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
1da177e4 LT |
531 | } else { |
532 | /* | |
533 | * Update the by-block entry to start later|be shorter. | |
534 | */ | |
535 | if ((error = xfs_alloc_update(bno_cur, nfbno1, nflen1))) | |
536 | return error; | |
537 | } | |
538 | if (nfbno2 != NULLAGBLOCK) { | |
539 | /* | |
540 | * 2 resulting free entries, need to add one. | |
541 | */ | |
542 | if ((error = xfs_alloc_lookup_eq(bno_cur, nfbno2, nflen2, &i))) | |
543 | return error; | |
5fb5aeee | 544 | XFS_WANT_CORRUPTED_RETURN(mp, i == 0); |
4b22a571 | 545 | if ((error = xfs_btree_insert(bno_cur, &i))) |
1da177e4 | 546 | return error; |
5fb5aeee | 547 | XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
1da177e4 LT |
548 | } |
549 | return 0; | |
550 | } | |
551 | ||
a6a781a5 | 552 | static xfs_failaddr_t |
612cfbfe | 553 | xfs_agfl_verify( |
bb80c6d7 DC |
554 | struct xfs_buf *bp) |
555 | { | |
dbd329f1 | 556 | struct xfs_mount *mp = bp->b_mount; |
bb80c6d7 | 557 | struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp); |
bb80c6d7 DC |
558 | int i; |
559 | ||
b5572597 DW |
560 | /* |
561 | * There is no verification of non-crc AGFLs because mkfs does not | |
562 | * initialise the AGFL to zero or NULL. Hence the only valid part of the | |
563 | * AGFL is what the AGF says is active. We can't get to the AGF, so we | |
564 | * can't verify just those entries are valid. | |
565 | */ | |
566 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
567 | return NULL; | |
568 | ||
39708c20 | 569 | if (!xfs_verify_magic(bp, agfl->agfl_magicnum)) |
a6a781a5 | 570 | return __this_address; |
39708c20 | 571 | if (!uuid_equal(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid)) |
a6a781a5 | 572 | return __this_address; |
77c95bba CH |
573 | /* |
574 | * during growfs operations, the perag is not fully initialised, | |
575 | * so we can't use it for any useful checking. growfs ensures we can't | |
576 | * use it by using uncached buffers that don't have the perag attached | |
577 | * so we can detect and avoid this problem. | |
578 | */ | |
579 | if (bp->b_pag && be32_to_cpu(agfl->agfl_seqno) != bp->b_pag->pag_agno) | |
a6a781a5 | 580 | return __this_address; |
77c95bba | 581 | |
a78ee256 | 582 | for (i = 0; i < xfs_agfl_size(mp); i++) { |
77c95bba | 583 | if (be32_to_cpu(agfl->agfl_bno[i]) != NULLAGBLOCK && |
bb80c6d7 | 584 | be32_to_cpu(agfl->agfl_bno[i]) >= mp->m_sb.sb_agblocks) |
a6a781a5 | 585 | return __this_address; |
bb80c6d7 | 586 | } |
a45086e2 | 587 | |
a6a781a5 DW |
588 | if (!xfs_log_check_lsn(mp, be64_to_cpu(XFS_BUF_TO_AGFL(bp)->agfl_lsn))) |
589 | return __this_address; | |
590 | return NULL; | |
77c95bba CH |
591 | } |
592 | ||
593 | static void | |
594 | xfs_agfl_read_verify( | |
595 | struct xfs_buf *bp) | |
596 | { | |
dbd329f1 | 597 | struct xfs_mount *mp = bp->b_mount; |
bc1a09b8 | 598 | xfs_failaddr_t fa; |
77c95bba CH |
599 | |
600 | /* | |
601 | * There is no verification of non-crc AGFLs because mkfs does not | |
602 | * initialise the AGFL to zero or NULL. Hence the only valid part of the | |
603 | * AGFL is what the AGF says is active. We can't get to the AGF, so we | |
604 | * can't verify just those entries are valid. | |
605 | */ | |
606 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
607 | return; | |
608 | ||
ce5028cf | 609 | if (!xfs_buf_verify_cksum(bp, XFS_AGFL_CRC_OFF)) |
bc1a09b8 DW |
610 | xfs_verifier_error(bp, -EFSBADCRC, __this_address); |
611 | else { | |
612 | fa = xfs_agfl_verify(bp); | |
613 | if (fa) | |
614 | xfs_verifier_error(bp, -EFSCORRUPTED, fa); | |
615 | } | |
612cfbfe DC |
616 | } |
617 | ||
1813dd64 | 618 | static void |
612cfbfe DC |
619 | xfs_agfl_write_verify( |
620 | struct xfs_buf *bp) | |
621 | { | |
dbd329f1 | 622 | struct xfs_mount *mp = bp->b_mount; |
fb1755a6 | 623 | struct xfs_buf_log_item *bip = bp->b_log_item; |
bc1a09b8 | 624 | xfs_failaddr_t fa; |
612cfbfe | 625 | |
77c95bba CH |
626 | /* no verification of non-crc AGFLs */ |
627 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
628 | return; | |
629 | ||
bc1a09b8 DW |
630 | fa = xfs_agfl_verify(bp); |
631 | if (fa) { | |
632 | xfs_verifier_error(bp, -EFSCORRUPTED, fa); | |
77c95bba CH |
633 | return; |
634 | } | |
635 | ||
636 | if (bip) | |
637 | XFS_BUF_TO_AGFL(bp)->agfl_lsn = cpu_to_be64(bip->bli_item.li_lsn); | |
638 | ||
f1dbcd7e | 639 | xfs_buf_update_cksum(bp, XFS_AGFL_CRC_OFF); |
bb80c6d7 DC |
640 | } |
641 | ||
1813dd64 | 642 | const struct xfs_buf_ops xfs_agfl_buf_ops = { |
233135b7 | 643 | .name = "xfs_agfl", |
39708c20 | 644 | .magic = { cpu_to_be32(XFS_AGFL_MAGIC), cpu_to_be32(XFS_AGFL_MAGIC) }, |
1813dd64 DC |
645 | .verify_read = xfs_agfl_read_verify, |
646 | .verify_write = xfs_agfl_write_verify, | |
b5572597 | 647 | .verify_struct = xfs_agfl_verify, |
1813dd64 DC |
648 | }; |
649 | ||
1da177e4 LT |
650 | /* |
651 | * Read in the allocation group free block array. | |
652 | */ | |
26788097 | 653 | int /* error */ |
1da177e4 LT |
654 | xfs_alloc_read_agfl( |
655 | xfs_mount_t *mp, /* mount point structure */ | |
656 | xfs_trans_t *tp, /* transaction pointer */ | |
657 | xfs_agnumber_t agno, /* allocation group number */ | |
658 | xfs_buf_t **bpp) /* buffer for the ag free block array */ | |
659 | { | |
660 | xfs_buf_t *bp; /* return value */ | |
661 | int error; | |
662 | ||
663 | ASSERT(agno != NULLAGNUMBER); | |
664 | error = xfs_trans_read_buf( | |
665 | mp, tp, mp->m_ddev_targp, | |
666 | XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)), | |
1813dd64 | 667 | XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_agfl_buf_ops); |
1da177e4 LT |
668 | if (error) |
669 | return error; | |
38f23232 | 670 | xfs_buf_set_ref(bp, XFS_AGFL_REF); |
1da177e4 LT |
671 | *bpp = bp; |
672 | return 0; | |
673 | } | |
674 | ||
ecb6928f CH |
675 | STATIC int |
676 | xfs_alloc_update_counters( | |
677 | struct xfs_trans *tp, | |
678 | struct xfs_perag *pag, | |
679 | struct xfs_buf *agbp, | |
680 | long len) | |
681 | { | |
682 | struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); | |
683 | ||
684 | pag->pagf_freeblks += len; | |
685 | be32_add_cpu(&agf->agf_freeblks, len); | |
686 | ||
687 | xfs_trans_agblocks_delta(tp, len); | |
688 | if (unlikely(be32_to_cpu(agf->agf_freeblks) > | |
689 | be32_to_cpu(agf->agf_length))) | |
2451337d | 690 | return -EFSCORRUPTED; |
ecb6928f CH |
691 | |
692 | xfs_alloc_log_agf(tp, agbp, XFS_AGF_FREEBLKS); | |
693 | return 0; | |
694 | } | |
695 | ||
1da177e4 LT |
696 | /* |
697 | * Allocation group level functions. | |
698 | */ | |
699 | ||
c63cdd4f BF |
700 | /* |
701 | * Deal with the case where only small freespaces remain. Either return the | |
702 | * contents of the last freespace record, or allocate space from the freelist if | |
703 | * there is nothing in the tree. | |
704 | */ | |
705 | STATIC int /* error */ | |
706 | xfs_alloc_ag_vextent_small( | |
707 | struct xfs_alloc_arg *args, /* allocation argument structure */ | |
708 | struct xfs_btree_cur *ccur, /* optional by-size cursor */ | |
709 | xfs_agblock_t *fbnop, /* result block number */ | |
710 | xfs_extlen_t *flenp, /* result length */ | |
711 | int *stat) /* status: 0-freelist, 1-normal/none */ | |
712 | { | |
713 | int error = 0; | |
714 | xfs_agblock_t fbno = NULLAGBLOCK; | |
715 | xfs_extlen_t flen = 0; | |
6691cd92 | 716 | int i = 0; |
c63cdd4f | 717 | |
6691cd92 BF |
718 | /* |
719 | * If a cntbt cursor is provided, try to allocate the largest record in | |
720 | * the tree. Try the AGFL if the cntbt is empty, otherwise fail the | |
721 | * allocation. Make sure to respect minleft even when pulling from the | |
722 | * freelist. | |
723 | */ | |
724 | if (ccur) | |
725 | error = xfs_btree_decrement(ccur, 0, &i); | |
c63cdd4f BF |
726 | if (error) |
727 | goto error; | |
728 | if (i) { | |
729 | error = xfs_alloc_get_rec(ccur, &fbno, &flen, &i); | |
730 | if (error) | |
731 | goto error; | |
732 | XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error); | |
733 | goto out; | |
734 | } | |
735 | ||
736 | if (args->minlen != 1 || args->alignment != 1 || | |
737 | args->resv == XFS_AG_RESV_AGFL || | |
738 | (be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_flcount) <= | |
739 | args->minleft)) | |
740 | goto out; | |
741 | ||
742 | error = xfs_alloc_get_freelist(args->tp, args->agbp, &fbno, 0); | |
743 | if (error) | |
744 | goto error; | |
745 | if (fbno == NULLAGBLOCK) | |
746 | goto out; | |
747 | ||
748 | xfs_extent_busy_reuse(args->mp, args->agno, fbno, 1, | |
749 | xfs_alloc_allow_busy_reuse(args->datatype)); | |
750 | ||
751 | if (xfs_alloc_is_userdata(args->datatype)) { | |
752 | struct xfs_buf *bp; | |
753 | ||
754 | bp = xfs_btree_get_bufs(args->mp, args->tp, args->agno, fbno); | |
755 | if (!bp) { | |
756 | error = -EFSCORRUPTED; | |
757 | goto error; | |
758 | } | |
759 | xfs_trans_binval(args->tp, bp); | |
760 | } | |
761 | args->len = 1; | |
762 | args->agbno = fbno; | |
763 | XFS_WANT_CORRUPTED_GOTO(args->mp, | |
764 | fbno < be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length), | |
765 | error); | |
766 | args->wasfromfl = 1; | |
767 | trace_xfs_alloc_small_freelist(args); | |
768 | ||
769 | /* | |
770 | * If we're feeding an AGFL block to something that doesn't live in the | |
771 | * free space, we need to clear out the OWN_AG rmap. | |
772 | */ | |
773 | error = xfs_rmap_free(args->tp, args->agbp, args->agno, fbno, 1, | |
774 | &XFS_RMAP_OINFO_AG); | |
775 | if (error) | |
776 | goto error; | |
777 | ||
778 | *stat = 0; | |
779 | return 0; | |
780 | ||
781 | out: | |
782 | /* | |
783 | * Can't do the allocation, give up. | |
784 | */ | |
785 | if (flen < args->minlen) { | |
786 | args->agbno = NULLAGBLOCK; | |
787 | trace_xfs_alloc_small_notenough(args); | |
788 | flen = 0; | |
789 | } | |
790 | *fbnop = fbno; | |
791 | *flenp = flen; | |
792 | *stat = 1; | |
793 | trace_xfs_alloc_small_done(args); | |
794 | return 0; | |
795 | ||
796 | error: | |
797 | trace_xfs_alloc_small_error(args); | |
798 | return error; | |
799 | } | |
800 | ||
1da177e4 LT |
801 | /* |
802 | * Allocate a variable extent in the allocation group agno. | |
803 | * Type and bno are used to determine where in the allocation group the | |
804 | * extent will start. | |
805 | * Extent's length (returned in *len) will be between minlen and maxlen, | |
806 | * and of the form k * prod + mod unless there's nothing that large. | |
807 | * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. | |
808 | */ | |
809 | STATIC int /* error */ | |
810 | xfs_alloc_ag_vextent( | |
811 | xfs_alloc_arg_t *args) /* argument structure for allocation */ | |
812 | { | |
813 | int error=0; | |
1da177e4 LT |
814 | |
815 | ASSERT(args->minlen > 0); | |
816 | ASSERT(args->maxlen > 0); | |
817 | ASSERT(args->minlen <= args->maxlen); | |
818 | ASSERT(args->mod < args->prod); | |
819 | ASSERT(args->alignment > 0); | |
3fd129b6 | 820 | |
1da177e4 LT |
821 | /* |
822 | * Branch to correct routine based on the type. | |
823 | */ | |
824 | args->wasfromfl = 0; | |
825 | switch (args->type) { | |
826 | case XFS_ALLOCTYPE_THIS_AG: | |
827 | error = xfs_alloc_ag_vextent_size(args); | |
828 | break; | |
829 | case XFS_ALLOCTYPE_NEAR_BNO: | |
830 | error = xfs_alloc_ag_vextent_near(args); | |
831 | break; | |
832 | case XFS_ALLOCTYPE_THIS_BNO: | |
833 | error = xfs_alloc_ag_vextent_exact(args); | |
834 | break; | |
835 | default: | |
836 | ASSERT(0); | |
837 | /* NOTREACHED */ | |
838 | } | |
ecb6928f CH |
839 | |
840 | if (error || args->agbno == NULLAGBLOCK) | |
1da177e4 | 841 | return error; |
ecb6928f CH |
842 | |
843 | ASSERT(args->len >= args->minlen); | |
844 | ASSERT(args->len <= args->maxlen); | |
0ab32086 | 845 | ASSERT(!args->wasfromfl || args->resv != XFS_AG_RESV_AGFL); |
ecb6928f CH |
846 | ASSERT(args->agbno % args->alignment == 0); |
847 | ||
673930c3 | 848 | /* if not file data, insert new block into the reverse map btree */ |
33df3a9c | 849 | if (!xfs_rmap_should_skip_owner_update(&args->oinfo)) { |
673930c3 DW |
850 | error = xfs_rmap_alloc(args->tp, args->agbp, args->agno, |
851 | args->agbno, args->len, &args->oinfo); | |
852 | if (error) | |
853 | return error; | |
854 | } | |
855 | ||
ecb6928f CH |
856 | if (!args->wasfromfl) { |
857 | error = xfs_alloc_update_counters(args->tp, args->pag, | |
858 | args->agbp, | |
859 | -((long)(args->len))); | |
860 | if (error) | |
861 | return error; | |
862 | ||
4ecbfe63 | 863 | ASSERT(!xfs_extent_busy_search(args->mp, args->agno, |
e26f0501 | 864 | args->agbno, args->len)); |
1da177e4 | 865 | } |
ecb6928f | 866 | |
3fd129b6 | 867 | xfs_ag_resv_alloc_extent(args->pag, args->resv, args); |
ecb6928f | 868 | |
ff6d6af2 BD |
869 | XFS_STATS_INC(args->mp, xs_allocx); |
870 | XFS_STATS_ADD(args->mp, xs_allocb, args->len); | |
ecb6928f | 871 | return error; |
1da177e4 LT |
872 | } |
873 | ||
874 | /* | |
875 | * Allocate a variable extent at exactly agno/bno. | |
876 | * Extent's length (returned in *len) will be between minlen and maxlen, | |
877 | * and of the form k * prod + mod unless there's nothing that large. | |
878 | * Return the starting a.g. block (bno), or NULLAGBLOCK if we can't do it. | |
879 | */ | |
880 | STATIC int /* error */ | |
881 | xfs_alloc_ag_vextent_exact( | |
882 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
883 | { | |
884 | xfs_btree_cur_t *bno_cur;/* by block-number btree cursor */ | |
885 | xfs_btree_cur_t *cnt_cur;/* by count btree cursor */ | |
1da177e4 LT |
886 | int error; |
887 | xfs_agblock_t fbno; /* start block of found extent */ | |
1da177e4 | 888 | xfs_extlen_t flen; /* length of found extent */ |
ebf55872 CH |
889 | xfs_agblock_t tbno; /* start block of busy extent */ |
890 | xfs_extlen_t tlen; /* length of busy extent */ | |
891 | xfs_agblock_t tend; /* end block of busy extent */ | |
1da177e4 | 892 | int i; /* success/failure of operation */ |
ebf55872 | 893 | unsigned busy_gen; |
1da177e4 LT |
894 | |
895 | ASSERT(args->alignment == 1); | |
9f9baab3 | 896 | |
1da177e4 LT |
897 | /* |
898 | * Allocate/initialize a cursor for the by-number freespace btree. | |
899 | */ | |
561f7d17 | 900 | bno_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
9f9baab3 CH |
901 | args->agno, XFS_BTNUM_BNO); |
902 | ||
1da177e4 LT |
903 | /* |
904 | * Lookup bno and minlen in the btree (minlen is irrelevant, really). | |
905 | * Look for the closest free block <= bno, it must contain bno | |
906 | * if any free block does. | |
907 | */ | |
9f9baab3 CH |
908 | error = xfs_alloc_lookup_le(bno_cur, args->agbno, args->minlen, &i); |
909 | if (error) | |
1da177e4 | 910 | goto error0; |
9f9baab3 CH |
911 | if (!i) |
912 | goto not_found; | |
913 | ||
1da177e4 LT |
914 | /* |
915 | * Grab the freespace record. | |
916 | */ | |
9f9baab3 CH |
917 | error = xfs_alloc_get_rec(bno_cur, &fbno, &flen, &i); |
918 | if (error) | |
1da177e4 | 919 | goto error0; |
c29aad41 | 920 | XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
1da177e4 | 921 | ASSERT(fbno <= args->agbno); |
9f9baab3 | 922 | |
1da177e4 | 923 | /* |
e26f0501 | 924 | * Check for overlapping busy extents. |
1da177e4 | 925 | */ |
ebf55872 CH |
926 | tbno = fbno; |
927 | tlen = flen; | |
928 | xfs_extent_busy_trim(args, &tbno, &tlen, &busy_gen); | |
e26f0501 CH |
929 | |
930 | /* | |
931 | * Give up if the start of the extent is busy, or the freespace isn't | |
932 | * long enough for the minimum request. | |
933 | */ | |
934 | if (tbno > args->agbno) | |
935 | goto not_found; | |
936 | if (tlen < args->minlen) | |
937 | goto not_found; | |
938 | tend = tbno + tlen; | |
939 | if (tend < args->agbno + args->minlen) | |
9f9baab3 CH |
940 | goto not_found; |
941 | ||
1da177e4 LT |
942 | /* |
943 | * End of extent will be smaller of the freespace end and the | |
944 | * maximal requested end. | |
9f9baab3 | 945 | * |
1da177e4 LT |
946 | * Fix the length according to mod and prod if given. |
947 | */ | |
81463b1c CS |
948 | args->len = XFS_AGBLOCK_MIN(tend, args->agbno + args->maxlen) |
949 | - args->agbno; | |
1da177e4 | 950 | xfs_alloc_fix_len(args); |
81463b1c | 951 | ASSERT(args->agbno + args->len <= tend); |
9f9baab3 | 952 | |
1da177e4 | 953 | /* |
81463b1c | 954 | * We are allocating agbno for args->len |
1da177e4 LT |
955 | * Allocate/initialize a cursor for the by-size btree. |
956 | */ | |
561f7d17 CH |
957 | cnt_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
958 | args->agno, XFS_BTNUM_CNT); | |
1da177e4 | 959 | ASSERT(args->agbno + args->len <= |
16259e7d | 960 | be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length)); |
9f9baab3 CH |
961 | error = xfs_alloc_fixup_trees(cnt_cur, bno_cur, fbno, flen, args->agbno, |
962 | args->len, XFSA_FIXUP_BNO_OK); | |
963 | if (error) { | |
1da177e4 LT |
964 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); |
965 | goto error0; | |
966 | } | |
9f9baab3 | 967 | |
1da177e4 LT |
968 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); |
969 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
0b1b213f | 970 | |
1da177e4 | 971 | args->wasfromfl = 0; |
9f9baab3 CH |
972 | trace_xfs_alloc_exact_done(args); |
973 | return 0; | |
974 | ||
975 | not_found: | |
976 | /* Didn't find it, return null. */ | |
977 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
978 | args->agbno = NULLAGBLOCK; | |
979 | trace_xfs_alloc_exact_notfound(args); | |
1da177e4 LT |
980 | return 0; |
981 | ||
982 | error0: | |
983 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); | |
0b1b213f | 984 | trace_xfs_alloc_exact_error(args); |
1da177e4 LT |
985 | return error; |
986 | } | |
987 | ||
489a150f CH |
988 | /* |
989 | * Search the btree in a given direction via the search cursor and compare | |
990 | * the records found against the good extent we've already found. | |
991 | */ | |
992 | STATIC int | |
993 | xfs_alloc_find_best_extent( | |
994 | struct xfs_alloc_arg *args, /* allocation argument structure */ | |
995 | struct xfs_btree_cur **gcur, /* good cursor */ | |
996 | struct xfs_btree_cur **scur, /* searching cursor */ | |
997 | xfs_agblock_t gdiff, /* difference for search comparison */ | |
998 | xfs_agblock_t *sbno, /* extent found by search */ | |
e26f0501 CH |
999 | xfs_extlen_t *slen, /* extent length */ |
1000 | xfs_agblock_t *sbnoa, /* aligned extent found by search */ | |
1001 | xfs_extlen_t *slena, /* aligned extent length */ | |
489a150f CH |
1002 | int dir) /* 0 = search right, 1 = search left */ |
1003 | { | |
489a150f CH |
1004 | xfs_agblock_t new; |
1005 | xfs_agblock_t sdiff; | |
1006 | int error; | |
1007 | int i; | |
ebf55872 | 1008 | unsigned busy_gen; |
489a150f CH |
1009 | |
1010 | /* The good extent is perfect, no need to search. */ | |
1011 | if (!gdiff) | |
1012 | goto out_use_good; | |
1013 | ||
1014 | /* | |
1015 | * Look until we find a better one, run out of space or run off the end. | |
1016 | */ | |
1017 | do { | |
1018 | error = xfs_alloc_get_rec(*scur, sbno, slen, &i); | |
1019 | if (error) | |
1020 | goto error0; | |
c29aad41 | 1021 | XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
ebf55872 CH |
1022 | xfs_alloc_compute_aligned(args, *sbno, *slen, |
1023 | sbnoa, slena, &busy_gen); | |
489a150f CH |
1024 | |
1025 | /* | |
1026 | * The good extent is closer than this one. | |
1027 | */ | |
1028 | if (!dir) { | |
bfe46d4e BF |
1029 | if (*sbnoa > args->max_agbno) |
1030 | goto out_use_good; | |
e26f0501 | 1031 | if (*sbnoa >= args->agbno + gdiff) |
489a150f CH |
1032 | goto out_use_good; |
1033 | } else { | |
bfe46d4e BF |
1034 | if (*sbnoa < args->min_agbno) |
1035 | goto out_use_good; | |
e26f0501 | 1036 | if (*sbnoa <= args->agbno - gdiff) |
489a150f CH |
1037 | goto out_use_good; |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * Same distance, compare length and pick the best. | |
1042 | */ | |
1043 | if (*slena >= args->minlen) { | |
1044 | args->len = XFS_EXTLEN_MIN(*slena, args->maxlen); | |
1045 | xfs_alloc_fix_len(args); | |
1046 | ||
1047 | sdiff = xfs_alloc_compute_diff(args->agbno, args->len, | |
211d022c | 1048 | args->alignment, |
292378ed | 1049 | args->datatype, *sbnoa, |
e26f0501 | 1050 | *slena, &new); |
489a150f CH |
1051 | |
1052 | /* | |
1053 | * Choose closer size and invalidate other cursor. | |
1054 | */ | |
1055 | if (sdiff < gdiff) | |
1056 | goto out_use_search; | |
1057 | goto out_use_good; | |
1058 | } | |
1059 | ||
1060 | if (!dir) | |
1061 | error = xfs_btree_increment(*scur, 0, &i); | |
1062 | else | |
1063 | error = xfs_btree_decrement(*scur, 0, &i); | |
1064 | if (error) | |
1065 | goto error0; | |
1066 | } while (i); | |
1067 | ||
1068 | out_use_good: | |
1069 | xfs_btree_del_cursor(*scur, XFS_BTREE_NOERROR); | |
1070 | *scur = NULL; | |
1071 | return 0; | |
1072 | ||
1073 | out_use_search: | |
1074 | xfs_btree_del_cursor(*gcur, XFS_BTREE_NOERROR); | |
1075 | *gcur = NULL; | |
1076 | return 0; | |
1077 | ||
1078 | error0: | |
1079 | /* caller invalidates cursors */ | |
1080 | return error; | |
1081 | } | |
1082 | ||
1da177e4 LT |
1083 | /* |
1084 | * Allocate a variable extent near bno in the allocation group agno. | |
1085 | * Extent's length (returned in len) will be between minlen and maxlen, | |
1086 | * and of the form k * prod + mod unless there's nothing that large. | |
1087 | * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. | |
1088 | */ | |
1089 | STATIC int /* error */ | |
1090 | xfs_alloc_ag_vextent_near( | |
1091 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
1092 | { | |
1093 | xfs_btree_cur_t *bno_cur_gt; /* cursor for bno btree, right side */ | |
1094 | xfs_btree_cur_t *bno_cur_lt; /* cursor for bno btree, left side */ | |
1095 | xfs_btree_cur_t *cnt_cur; /* cursor for count btree */ | |
1da177e4 LT |
1096 | xfs_agblock_t gtbno; /* start bno of right side entry */ |
1097 | xfs_agblock_t gtbnoa; /* aligned ... */ | |
1098 | xfs_extlen_t gtdiff; /* difference to right side entry */ | |
1099 | xfs_extlen_t gtlen; /* length of right side entry */ | |
e26f0501 | 1100 | xfs_extlen_t gtlena; /* aligned ... */ |
1da177e4 LT |
1101 | xfs_agblock_t gtnew; /* useful start bno of right side */ |
1102 | int error; /* error code */ | |
1103 | int i; /* result code, temporary */ | |
1104 | int j; /* result code, temporary */ | |
1105 | xfs_agblock_t ltbno; /* start bno of left side entry */ | |
1106 | xfs_agblock_t ltbnoa; /* aligned ... */ | |
1107 | xfs_extlen_t ltdiff; /* difference to left side entry */ | |
1da177e4 | 1108 | xfs_extlen_t ltlen; /* length of left side entry */ |
e26f0501 | 1109 | xfs_extlen_t ltlena; /* aligned ... */ |
1da177e4 LT |
1110 | xfs_agblock_t ltnew; /* useful start bno of left side */ |
1111 | xfs_extlen_t rlen; /* length of returned extent */ | |
ebf55872 CH |
1112 | bool busy; |
1113 | unsigned busy_gen; | |
63d20d6e | 1114 | #ifdef DEBUG |
1da177e4 LT |
1115 | /* |
1116 | * Randomly don't execute the first algorithm. | |
1117 | */ | |
1118 | int dofirst; /* set to do first algorithm */ | |
1119 | ||
ecb3403d | 1120 | dofirst = prandom_u32() & 1; |
1da177e4 | 1121 | #endif |
e26f0501 | 1122 | |
bfe46d4e BF |
1123 | /* handle unitialized agbno range so caller doesn't have to */ |
1124 | if (!args->min_agbno && !args->max_agbno) | |
1125 | args->max_agbno = args->mp->m_sb.sb_agblocks - 1; | |
1126 | ASSERT(args->min_agbno <= args->max_agbno); | |
1127 | ||
1128 | /* clamp agbno to the range if it's outside */ | |
1129 | if (args->agbno < args->min_agbno) | |
1130 | args->agbno = args->min_agbno; | |
1131 | if (args->agbno > args->max_agbno) | |
1132 | args->agbno = args->max_agbno; | |
1133 | ||
e26f0501 CH |
1134 | restart: |
1135 | bno_cur_lt = NULL; | |
1136 | bno_cur_gt = NULL; | |
1137 | ltlen = 0; | |
1138 | gtlena = 0; | |
1139 | ltlena = 0; | |
ebf55872 | 1140 | busy = false; |
e26f0501 | 1141 | |
1da177e4 LT |
1142 | /* |
1143 | * Get a cursor for the by-size btree. | |
1144 | */ | |
561f7d17 CH |
1145 | cnt_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
1146 | args->agno, XFS_BTNUM_CNT); | |
e26f0501 | 1147 | |
1da177e4 LT |
1148 | /* |
1149 | * See if there are any free extents as big as maxlen. | |
1150 | */ | |
1151 | if ((error = xfs_alloc_lookup_ge(cnt_cur, 0, args->maxlen, &i))) | |
1152 | goto error0; | |
1153 | /* | |
1154 | * If none, then pick up the last entry in the tree unless the | |
1155 | * tree is empty. | |
1156 | */ | |
1157 | if (!i) { | |
1158 | if ((error = xfs_alloc_ag_vextent_small(args, cnt_cur, <bno, | |
1159 | <len, &i))) | |
1160 | goto error0; | |
1161 | if (i == 0 || ltlen == 0) { | |
1162 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
e26f0501 | 1163 | trace_xfs_alloc_near_noentry(args); |
1da177e4 LT |
1164 | return 0; |
1165 | } | |
1166 | ASSERT(i == 1); | |
1167 | } | |
1168 | args->wasfromfl = 0; | |
e26f0501 | 1169 | |
1da177e4 LT |
1170 | /* |
1171 | * First algorithm. | |
1172 | * If the requested extent is large wrt the freespaces available | |
1173 | * in this a.g., then the cursor will be pointing to a btree entry | |
1174 | * near the right edge of the tree. If it's in the last btree leaf | |
1175 | * block, then we just examine all the entries in that block | |
1176 | * that are big enough, and pick the best one. | |
1177 | * This is written as a while loop so we can break out of it, | |
1178 | * but we never loop back to the top. | |
1179 | */ | |
1180 | while (xfs_btree_islastblock(cnt_cur, 0)) { | |
1181 | xfs_extlen_t bdiff; | |
1182 | int besti=0; | |
1183 | xfs_extlen_t blen=0; | |
1184 | xfs_agblock_t bnew=0; | |
1185 | ||
63d20d6e DC |
1186 | #ifdef DEBUG |
1187 | if (dofirst) | |
1da177e4 LT |
1188 | break; |
1189 | #endif | |
1190 | /* | |
1191 | * Start from the entry that lookup found, sequence through | |
1192 | * all larger free blocks. If we're actually pointing at a | |
1193 | * record smaller than maxlen, go to the start of this block, | |
1194 | * and skip all those smaller than minlen. | |
1195 | */ | |
1196 | if (ltlen || args->alignment > 1) { | |
1197 | cnt_cur->bc_ptrs[0] = 1; | |
1198 | do { | |
1199 | if ((error = xfs_alloc_get_rec(cnt_cur, <bno, | |
1200 | <len, &i))) | |
1201 | goto error0; | |
c29aad41 | 1202 | XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
1da177e4 LT |
1203 | if (ltlen >= args->minlen) |
1204 | break; | |
637aa50f | 1205 | if ((error = xfs_btree_increment(cnt_cur, 0, &i))) |
1da177e4 LT |
1206 | goto error0; |
1207 | } while (i); | |
1208 | ASSERT(ltlen >= args->minlen); | |
1209 | if (!i) | |
1210 | break; | |
1211 | } | |
1212 | i = cnt_cur->bc_ptrs[0]; | |
1213 | for (j = 1, blen = 0, bdiff = 0; | |
1214 | !error && j && (blen < args->maxlen || bdiff > 0); | |
637aa50f | 1215 | error = xfs_btree_increment(cnt_cur, 0, &j)) { |
1da177e4 LT |
1216 | /* |
1217 | * For each entry, decide if it's better than | |
1218 | * the previous best entry. | |
1219 | */ | |
1220 | if ((error = xfs_alloc_get_rec(cnt_cur, <bno, <len, &i))) | |
1221 | goto error0; | |
c29aad41 | 1222 | XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
ebf55872 CH |
1223 | busy = xfs_alloc_compute_aligned(args, ltbno, ltlen, |
1224 | <bnoa, <lena, &busy_gen); | |
e6430037 | 1225 | if (ltlena < args->minlen) |
1da177e4 | 1226 | continue; |
bfe46d4e BF |
1227 | if (ltbnoa < args->min_agbno || ltbnoa > args->max_agbno) |
1228 | continue; | |
1da177e4 LT |
1229 | args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen); |
1230 | xfs_alloc_fix_len(args); | |
1231 | ASSERT(args->len >= args->minlen); | |
1232 | if (args->len < blen) | |
1233 | continue; | |
1234 | ltdiff = xfs_alloc_compute_diff(args->agbno, args->len, | |
292378ed | 1235 | args->alignment, args->datatype, ltbnoa, |
211d022c | 1236 | ltlena, <new); |
1da177e4 LT |
1237 | if (ltnew != NULLAGBLOCK && |
1238 | (args->len > blen || ltdiff < bdiff)) { | |
1239 | bdiff = ltdiff; | |
1240 | bnew = ltnew; | |
1241 | blen = args->len; | |
1242 | besti = cnt_cur->bc_ptrs[0]; | |
1243 | } | |
1244 | } | |
1245 | /* | |
1246 | * It didn't work. We COULD be in a case where | |
1247 | * there's a good record somewhere, so try again. | |
1248 | */ | |
1249 | if (blen == 0) | |
1250 | break; | |
1251 | /* | |
1252 | * Point at the best entry, and retrieve it again. | |
1253 | */ | |
1254 | cnt_cur->bc_ptrs[0] = besti; | |
1255 | if ((error = xfs_alloc_get_rec(cnt_cur, <bno, <len, &i))) | |
1256 | goto error0; | |
c29aad41 | 1257 | XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
73523a2e | 1258 | ASSERT(ltbno + ltlen <= be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length)); |
1da177e4 | 1259 | args->len = blen; |
54fee133 | 1260 | |
1da177e4 LT |
1261 | /* |
1262 | * We are allocating starting at bnew for blen blocks. | |
1263 | */ | |
1264 | args->agbno = bnew; | |
1265 | ASSERT(bnew >= ltbno); | |
73523a2e | 1266 | ASSERT(bnew + blen <= ltbno + ltlen); |
1da177e4 LT |
1267 | /* |
1268 | * Set up a cursor for the by-bno tree. | |
1269 | */ | |
561f7d17 CH |
1270 | bno_cur_lt = xfs_allocbt_init_cursor(args->mp, args->tp, |
1271 | args->agbp, args->agno, XFS_BTNUM_BNO); | |
1da177e4 LT |
1272 | /* |
1273 | * Fix up the btree entries. | |
1274 | */ | |
1275 | if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur_lt, ltbno, | |
1276 | ltlen, bnew, blen, XFSA_FIXUP_CNT_OK))) | |
1277 | goto error0; | |
1278 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1279 | xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_NOERROR); | |
0b1b213f CH |
1280 | |
1281 | trace_xfs_alloc_near_first(args); | |
1da177e4 LT |
1282 | return 0; |
1283 | } | |
1284 | /* | |
1285 | * Second algorithm. | |
1286 | * Search in the by-bno tree to the left and to the right | |
1287 | * simultaneously, until in each case we find a space big enough, | |
1288 | * or run into the edge of the tree. When we run into the edge, | |
1289 | * we deallocate that cursor. | |
1290 | * If both searches succeed, we compare the two spaces and pick | |
1291 | * the better one. | |
1292 | * With alignment, it's possible for both to fail; the upper | |
1293 | * level algorithm that picks allocation groups for allocations | |
1294 | * is not supposed to do this. | |
1295 | */ | |
1296 | /* | |
1297 | * Allocate and initialize the cursor for the leftward search. | |
1298 | */ | |
561f7d17 CH |
1299 | bno_cur_lt = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
1300 | args->agno, XFS_BTNUM_BNO); | |
1da177e4 LT |
1301 | /* |
1302 | * Lookup <= bno to find the leftward search's starting point. | |
1303 | */ | |
1304 | if ((error = xfs_alloc_lookup_le(bno_cur_lt, args->agbno, args->maxlen, &i))) | |
1305 | goto error0; | |
1306 | if (!i) { | |
1307 | /* | |
1308 | * Didn't find anything; use this cursor for the rightward | |
1309 | * search. | |
1310 | */ | |
1311 | bno_cur_gt = bno_cur_lt; | |
1312 | bno_cur_lt = NULL; | |
1313 | } | |
1314 | /* | |
1315 | * Found something. Duplicate the cursor for the rightward search. | |
1316 | */ | |
1317 | else if ((error = xfs_btree_dup_cursor(bno_cur_lt, &bno_cur_gt))) | |
1318 | goto error0; | |
1319 | /* | |
1320 | * Increment the cursor, so we will point at the entry just right | |
1321 | * of the leftward entry if any, or to the leftmost entry. | |
1322 | */ | |
637aa50f | 1323 | if ((error = xfs_btree_increment(bno_cur_gt, 0, &i))) |
1da177e4 LT |
1324 | goto error0; |
1325 | if (!i) { | |
1326 | /* | |
1327 | * It failed, there are no rightward entries. | |
1328 | */ | |
1329 | xfs_btree_del_cursor(bno_cur_gt, XFS_BTREE_NOERROR); | |
1330 | bno_cur_gt = NULL; | |
1331 | } | |
1332 | /* | |
1333 | * Loop going left with the leftward cursor, right with the | |
1334 | * rightward cursor, until either both directions give up or | |
1335 | * we find an entry at least as big as minlen. | |
1336 | */ | |
1337 | do { | |
1338 | if (bno_cur_lt) { | |
1339 | if ((error = xfs_alloc_get_rec(bno_cur_lt, <bno, <len, &i))) | |
1340 | goto error0; | |
c29aad41 | 1341 | XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
ebf55872 CH |
1342 | busy |= xfs_alloc_compute_aligned(args, ltbno, ltlen, |
1343 | <bnoa, <lena, &busy_gen); | |
bfe46d4e | 1344 | if (ltlena >= args->minlen && ltbnoa >= args->min_agbno) |
1da177e4 | 1345 | break; |
8df4da4a | 1346 | if ((error = xfs_btree_decrement(bno_cur_lt, 0, &i))) |
1da177e4 | 1347 | goto error0; |
bfe46d4e | 1348 | if (!i || ltbnoa < args->min_agbno) { |
1da177e4 LT |
1349 | xfs_btree_del_cursor(bno_cur_lt, |
1350 | XFS_BTREE_NOERROR); | |
1351 | bno_cur_lt = NULL; | |
1352 | } | |
1353 | } | |
1354 | if (bno_cur_gt) { | |
1355 | if ((error = xfs_alloc_get_rec(bno_cur_gt, >bno, >len, &i))) | |
1356 | goto error0; | |
c29aad41 | 1357 | XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
ebf55872 CH |
1358 | busy |= xfs_alloc_compute_aligned(args, gtbno, gtlen, |
1359 | >bnoa, >lena, &busy_gen); | |
bfe46d4e | 1360 | if (gtlena >= args->minlen && gtbnoa <= args->max_agbno) |
1da177e4 | 1361 | break; |
637aa50f | 1362 | if ((error = xfs_btree_increment(bno_cur_gt, 0, &i))) |
1da177e4 | 1363 | goto error0; |
bfe46d4e | 1364 | if (!i || gtbnoa > args->max_agbno) { |
1da177e4 LT |
1365 | xfs_btree_del_cursor(bno_cur_gt, |
1366 | XFS_BTREE_NOERROR); | |
1367 | bno_cur_gt = NULL; | |
1368 | } | |
1369 | } | |
1370 | } while (bno_cur_lt || bno_cur_gt); | |
489a150f | 1371 | |
1da177e4 LT |
1372 | /* |
1373 | * Got both cursors still active, need to find better entry. | |
1374 | */ | |
1375 | if (bno_cur_lt && bno_cur_gt) { | |
1da177e4 LT |
1376 | if (ltlena >= args->minlen) { |
1377 | /* | |
489a150f | 1378 | * Left side is good, look for a right side entry. |
1da177e4 LT |
1379 | */ |
1380 | args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen); | |
1381 | xfs_alloc_fix_len(args); | |
489a150f | 1382 | ltdiff = xfs_alloc_compute_diff(args->agbno, args->len, |
292378ed | 1383 | args->alignment, args->datatype, ltbnoa, |
211d022c | 1384 | ltlena, <new); |
489a150f CH |
1385 | |
1386 | error = xfs_alloc_find_best_extent(args, | |
1387 | &bno_cur_lt, &bno_cur_gt, | |
e26f0501 CH |
1388 | ltdiff, >bno, >len, |
1389 | >bnoa, >lena, | |
489a150f CH |
1390 | 0 /* search right */); |
1391 | } else { | |
1392 | ASSERT(gtlena >= args->minlen); | |
1393 | ||
1da177e4 | 1394 | /* |
489a150f | 1395 | * Right side is good, look for a left side entry. |
1da177e4 LT |
1396 | */ |
1397 | args->len = XFS_EXTLEN_MIN(gtlena, args->maxlen); | |
1398 | xfs_alloc_fix_len(args); | |
489a150f | 1399 | gtdiff = xfs_alloc_compute_diff(args->agbno, args->len, |
292378ed | 1400 | args->alignment, args->datatype, gtbnoa, |
211d022c | 1401 | gtlena, >new); |
489a150f CH |
1402 | |
1403 | error = xfs_alloc_find_best_extent(args, | |
1404 | &bno_cur_gt, &bno_cur_lt, | |
e26f0501 CH |
1405 | gtdiff, <bno, <len, |
1406 | <bnoa, <lena, | |
489a150f | 1407 | 1 /* search left */); |
1da177e4 | 1408 | } |
489a150f CH |
1409 | |
1410 | if (error) | |
1411 | goto error0; | |
1da177e4 | 1412 | } |
489a150f | 1413 | |
1da177e4 LT |
1414 | /* |
1415 | * If we couldn't get anything, give up. | |
1416 | */ | |
1417 | if (bno_cur_lt == NULL && bno_cur_gt == NULL) { | |
e3a746f5 DC |
1418 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
1419 | ||
ebf55872 | 1420 | if (busy) { |
e26f0501 | 1421 | trace_xfs_alloc_near_busy(args); |
ebf55872 | 1422 | xfs_extent_busy_flush(args->mp, args->pag, busy_gen); |
e26f0501 CH |
1423 | goto restart; |
1424 | } | |
0b1b213f | 1425 | trace_xfs_alloc_size_neither(args); |
1da177e4 LT |
1426 | args->agbno = NULLAGBLOCK; |
1427 | return 0; | |
1428 | } | |
489a150f | 1429 | |
1da177e4 LT |
1430 | /* |
1431 | * At this point we have selected a freespace entry, either to the | |
1432 | * left or to the right. If it's on the right, copy all the | |
1433 | * useful variables to the "left" set so we only have one | |
1434 | * copy of this code. | |
1435 | */ | |
1436 | if (bno_cur_gt) { | |
1437 | bno_cur_lt = bno_cur_gt; | |
1438 | bno_cur_gt = NULL; | |
1439 | ltbno = gtbno; | |
1440 | ltbnoa = gtbnoa; | |
1441 | ltlen = gtlen; | |
1442 | ltlena = gtlena; | |
1443 | j = 1; | |
1444 | } else | |
1445 | j = 0; | |
489a150f | 1446 | |
1da177e4 LT |
1447 | /* |
1448 | * Fix up the length and compute the useful address. | |
1449 | */ | |
1da177e4 LT |
1450 | args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen); |
1451 | xfs_alloc_fix_len(args); | |
1da177e4 | 1452 | rlen = args->len; |
e26f0501 | 1453 | (void)xfs_alloc_compute_diff(args->agbno, rlen, args->alignment, |
292378ed | 1454 | args->datatype, ltbnoa, ltlena, <new); |
1da177e4 | 1455 | ASSERT(ltnew >= ltbno); |
e26f0501 | 1456 | ASSERT(ltnew + rlen <= ltbnoa + ltlena); |
16259e7d | 1457 | ASSERT(ltnew + rlen <= be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length)); |
bfe46d4e | 1458 | ASSERT(ltnew >= args->min_agbno && ltnew <= args->max_agbno); |
1da177e4 | 1459 | args->agbno = ltnew; |
e26f0501 | 1460 | |
1da177e4 LT |
1461 | if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur_lt, ltbno, ltlen, |
1462 | ltnew, rlen, XFSA_FIXUP_BNO_OK))) | |
1463 | goto error0; | |
0b1b213f CH |
1464 | |
1465 | if (j) | |
1466 | trace_xfs_alloc_near_greater(args); | |
1467 | else | |
1468 | trace_xfs_alloc_near_lesser(args); | |
1469 | ||
1da177e4 LT |
1470 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
1471 | xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_NOERROR); | |
1472 | return 0; | |
1473 | ||
1474 | error0: | |
0b1b213f | 1475 | trace_xfs_alloc_near_error(args); |
1da177e4 LT |
1476 | if (cnt_cur != NULL) |
1477 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); | |
1478 | if (bno_cur_lt != NULL) | |
1479 | xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_ERROR); | |
1480 | if (bno_cur_gt != NULL) | |
1481 | xfs_btree_del_cursor(bno_cur_gt, XFS_BTREE_ERROR); | |
1482 | return error; | |
1483 | } | |
1484 | ||
1485 | /* | |
1486 | * Allocate a variable extent anywhere in the allocation group agno. | |
1487 | * Extent's length (returned in len) will be between minlen and maxlen, | |
1488 | * and of the form k * prod + mod unless there's nothing that large. | |
1489 | * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. | |
1490 | */ | |
1491 | STATIC int /* error */ | |
1492 | xfs_alloc_ag_vextent_size( | |
1493 | xfs_alloc_arg_t *args) /* allocation argument structure */ | |
1494 | { | |
1495 | xfs_btree_cur_t *bno_cur; /* cursor for bno btree */ | |
1496 | xfs_btree_cur_t *cnt_cur; /* cursor for cnt btree */ | |
1497 | int error; /* error result */ | |
1498 | xfs_agblock_t fbno; /* start of found freespace */ | |
1499 | xfs_extlen_t flen; /* length of found freespace */ | |
1da177e4 LT |
1500 | int i; /* temp status variable */ |
1501 | xfs_agblock_t rbno; /* returned block number */ | |
1502 | xfs_extlen_t rlen; /* length of returned extent */ | |
ebf55872 CH |
1503 | bool busy; |
1504 | unsigned busy_gen; | |
1da177e4 | 1505 | |
e26f0501 | 1506 | restart: |
1da177e4 LT |
1507 | /* |
1508 | * Allocate and initialize a cursor for the by-size btree. | |
1509 | */ | |
561f7d17 CH |
1510 | cnt_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
1511 | args->agno, XFS_BTNUM_CNT); | |
1da177e4 | 1512 | bno_cur = NULL; |
ebf55872 | 1513 | busy = false; |
e26f0501 | 1514 | |
1da177e4 LT |
1515 | /* |
1516 | * Look for an entry >= maxlen+alignment-1 blocks. | |
1517 | */ | |
1518 | if ((error = xfs_alloc_lookup_ge(cnt_cur, 0, | |
1519 | args->maxlen + args->alignment - 1, &i))) | |
1520 | goto error0; | |
e26f0501 | 1521 | |
1da177e4 | 1522 | /* |
ebf55872 CH |
1523 | * If none then we have to settle for a smaller extent. In the case that |
1524 | * there are no large extents, this will return the last entry in the | |
1525 | * tree unless the tree is empty. In the case that there are only busy | |
1526 | * large extents, this will return the largest small extent unless there | |
e26f0501 | 1527 | * are no smaller extents available. |
1da177e4 | 1528 | */ |
ebf55872 | 1529 | if (!i) { |
e26f0501 CH |
1530 | error = xfs_alloc_ag_vextent_small(args, cnt_cur, |
1531 | &fbno, &flen, &i); | |
1532 | if (error) | |
1da177e4 LT |
1533 | goto error0; |
1534 | if (i == 0 || flen == 0) { | |
1535 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
0b1b213f | 1536 | trace_xfs_alloc_size_noentry(args); |
1da177e4 LT |
1537 | return 0; |
1538 | } | |
1539 | ASSERT(i == 1); | |
ebf55872 CH |
1540 | busy = xfs_alloc_compute_aligned(args, fbno, flen, &rbno, |
1541 | &rlen, &busy_gen); | |
e26f0501 CH |
1542 | } else { |
1543 | /* | |
1544 | * Search for a non-busy extent that is large enough. | |
e26f0501 CH |
1545 | */ |
1546 | for (;;) { | |
1547 | error = xfs_alloc_get_rec(cnt_cur, &fbno, &flen, &i); | |
1548 | if (error) | |
1549 | goto error0; | |
c29aad41 | 1550 | XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
e26f0501 | 1551 | |
ebf55872 CH |
1552 | busy = xfs_alloc_compute_aligned(args, fbno, flen, |
1553 | &rbno, &rlen, &busy_gen); | |
e26f0501 CH |
1554 | |
1555 | if (rlen >= args->maxlen) | |
1556 | break; | |
1557 | ||
1558 | error = xfs_btree_increment(cnt_cur, 0, &i); | |
1559 | if (error) | |
1560 | goto error0; | |
1561 | if (i == 0) { | |
1562 | /* | |
1563 | * Our only valid extents must have been busy. | |
1564 | * Make it unbusy by forcing the log out and | |
ebf55872 | 1565 | * retrying. |
e26f0501 CH |
1566 | */ |
1567 | xfs_btree_del_cursor(cnt_cur, | |
1568 | XFS_BTREE_NOERROR); | |
1569 | trace_xfs_alloc_size_busy(args); | |
ebf55872 CH |
1570 | xfs_extent_busy_flush(args->mp, |
1571 | args->pag, busy_gen); | |
e26f0501 CH |
1572 | goto restart; |
1573 | } | |
1574 | } | |
1da177e4 | 1575 | } |
e26f0501 | 1576 | |
1da177e4 LT |
1577 | /* |
1578 | * In the first case above, we got the last entry in the | |
1579 | * by-size btree. Now we check to see if the space hits maxlen | |
1580 | * once aligned; if not, we search left for something better. | |
1581 | * This can't happen in the second case above. | |
1582 | */ | |
1da177e4 | 1583 | rlen = XFS_EXTLEN_MIN(args->maxlen, rlen); |
c29aad41 | 1584 | XFS_WANT_CORRUPTED_GOTO(args->mp, rlen == 0 || |
1da177e4 LT |
1585 | (rlen <= flen && rbno + rlen <= fbno + flen), error0); |
1586 | if (rlen < args->maxlen) { | |
1587 | xfs_agblock_t bestfbno; | |
1588 | xfs_extlen_t bestflen; | |
1589 | xfs_agblock_t bestrbno; | |
1590 | xfs_extlen_t bestrlen; | |
1591 | ||
1592 | bestrlen = rlen; | |
1593 | bestrbno = rbno; | |
1594 | bestflen = flen; | |
1595 | bestfbno = fbno; | |
1596 | for (;;) { | |
8df4da4a | 1597 | if ((error = xfs_btree_decrement(cnt_cur, 0, &i))) |
1da177e4 LT |
1598 | goto error0; |
1599 | if (i == 0) | |
1600 | break; | |
1601 | if ((error = xfs_alloc_get_rec(cnt_cur, &fbno, &flen, | |
1602 | &i))) | |
1603 | goto error0; | |
c29aad41 | 1604 | XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
1da177e4 LT |
1605 | if (flen < bestrlen) |
1606 | break; | |
ebf55872 CH |
1607 | busy = xfs_alloc_compute_aligned(args, fbno, flen, |
1608 | &rbno, &rlen, &busy_gen); | |
1da177e4 | 1609 | rlen = XFS_EXTLEN_MIN(args->maxlen, rlen); |
c29aad41 | 1610 | XFS_WANT_CORRUPTED_GOTO(args->mp, rlen == 0 || |
1da177e4 LT |
1611 | (rlen <= flen && rbno + rlen <= fbno + flen), |
1612 | error0); | |
1613 | if (rlen > bestrlen) { | |
1614 | bestrlen = rlen; | |
1615 | bestrbno = rbno; | |
1616 | bestflen = flen; | |
1617 | bestfbno = fbno; | |
1618 | if (rlen == args->maxlen) | |
1619 | break; | |
1620 | } | |
1621 | } | |
1622 | if ((error = xfs_alloc_lookup_eq(cnt_cur, bestfbno, bestflen, | |
1623 | &i))) | |
1624 | goto error0; | |
c29aad41 | 1625 | XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
1da177e4 LT |
1626 | rlen = bestrlen; |
1627 | rbno = bestrbno; | |
1628 | flen = bestflen; | |
1629 | fbno = bestfbno; | |
1630 | } | |
1631 | args->wasfromfl = 0; | |
1632 | /* | |
1633 | * Fix up the length. | |
1634 | */ | |
1635 | args->len = rlen; | |
e26f0501 | 1636 | if (rlen < args->minlen) { |
ebf55872 | 1637 | if (busy) { |
e26f0501 CH |
1638 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
1639 | trace_xfs_alloc_size_busy(args); | |
ebf55872 | 1640 | xfs_extent_busy_flush(args->mp, args->pag, busy_gen); |
e26f0501 CH |
1641 | goto restart; |
1642 | } | |
1643 | goto out_nominleft; | |
1da177e4 | 1644 | } |
e26f0501 CH |
1645 | xfs_alloc_fix_len(args); |
1646 | ||
1da177e4 | 1647 | rlen = args->len; |
c29aad41 | 1648 | XFS_WANT_CORRUPTED_GOTO(args->mp, rlen <= flen, error0); |
1da177e4 LT |
1649 | /* |
1650 | * Allocate and initialize a cursor for the by-block tree. | |
1651 | */ | |
561f7d17 CH |
1652 | bno_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
1653 | args->agno, XFS_BTNUM_BNO); | |
1da177e4 LT |
1654 | if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur, fbno, flen, |
1655 | rbno, rlen, XFSA_FIXUP_CNT_OK))) | |
1656 | goto error0; | |
1657 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1658 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
1659 | cnt_cur = bno_cur = NULL; | |
1660 | args->len = rlen; | |
1661 | args->agbno = rbno; | |
c29aad41 | 1662 | XFS_WANT_CORRUPTED_GOTO(args->mp, |
1da177e4 | 1663 | args->agbno + args->len <= |
16259e7d | 1664 | be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length), |
1da177e4 | 1665 | error0); |
0b1b213f | 1666 | trace_xfs_alloc_size_done(args); |
1da177e4 LT |
1667 | return 0; |
1668 | ||
1669 | error0: | |
0b1b213f | 1670 | trace_xfs_alloc_size_error(args); |
1da177e4 LT |
1671 | if (cnt_cur) |
1672 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); | |
1673 | if (bno_cur) | |
1674 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); | |
1675 | return error; | |
e26f0501 CH |
1676 | |
1677 | out_nominleft: | |
1678 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1679 | trace_xfs_alloc_size_nominleft(args); | |
1680 | args->agbno = NULLAGBLOCK; | |
1681 | return 0; | |
1da177e4 LT |
1682 | } |
1683 | ||
1da177e4 LT |
1684 | /* |
1685 | * Free the extent starting at agno/bno for length. | |
1686 | */ | |
340785cc | 1687 | STATIC int |
1da177e4 | 1688 | xfs_free_ag_extent( |
66e3237e DW |
1689 | struct xfs_trans *tp, |
1690 | struct xfs_buf *agbp, | |
1691 | xfs_agnumber_t agno, | |
1692 | xfs_agblock_t bno, | |
1693 | xfs_extlen_t len, | |
1694 | const struct xfs_owner_info *oinfo, | |
1695 | enum xfs_ag_resv_type type) | |
1da177e4 | 1696 | { |
66e3237e DW |
1697 | struct xfs_mount *mp; |
1698 | struct xfs_perag *pag; | |
1699 | struct xfs_btree_cur *bno_cur; | |
1700 | struct xfs_btree_cur *cnt_cur; | |
1701 | xfs_agblock_t gtbno; /* start of right neighbor */ | |
1702 | xfs_extlen_t gtlen; /* length of right neighbor */ | |
1703 | xfs_agblock_t ltbno; /* start of left neighbor */ | |
1704 | xfs_extlen_t ltlen; /* length of left neighbor */ | |
1705 | xfs_agblock_t nbno; /* new starting block of freesp */ | |
1706 | xfs_extlen_t nlen; /* new length of freespace */ | |
1707 | int haveleft; /* have a left neighbor */ | |
1708 | int haveright; /* have a right neighbor */ | |
1709 | int i; | |
1710 | int error; | |
1da177e4 | 1711 | |
673930c3 | 1712 | bno_cur = cnt_cur = NULL; |
1da177e4 | 1713 | mp = tp->t_mountp; |
673930c3 | 1714 | |
33df3a9c | 1715 | if (!xfs_rmap_should_skip_owner_update(oinfo)) { |
673930c3 DW |
1716 | error = xfs_rmap_free(tp, agbp, agno, bno, len, oinfo); |
1717 | if (error) | |
1718 | goto error0; | |
1719 | } | |
1720 | ||
1da177e4 LT |
1721 | /* |
1722 | * Allocate and initialize a cursor for the by-block btree. | |
1723 | */ | |
561f7d17 | 1724 | bno_cur = xfs_allocbt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_BNO); |
1da177e4 LT |
1725 | /* |
1726 | * Look for a neighboring block on the left (lower block numbers) | |
1727 | * that is contiguous with this space. | |
1728 | */ | |
1729 | if ((error = xfs_alloc_lookup_le(bno_cur, bno, len, &haveleft))) | |
1730 | goto error0; | |
1731 | if (haveleft) { | |
1732 | /* | |
1733 | * There is a block to our left. | |
1734 | */ | |
1735 | if ((error = xfs_alloc_get_rec(bno_cur, <bno, <len, &i))) | |
1736 | goto error0; | |
c29aad41 | 1737 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
1da177e4 LT |
1738 | /* |
1739 | * It's not contiguous, though. | |
1740 | */ | |
1741 | if (ltbno + ltlen < bno) | |
1742 | haveleft = 0; | |
1743 | else { | |
1744 | /* | |
1745 | * If this failure happens the request to free this | |
1746 | * space was invalid, it's (partly) already free. | |
1747 | * Very bad. | |
1748 | */ | |
c29aad41 ES |
1749 | XFS_WANT_CORRUPTED_GOTO(mp, |
1750 | ltbno + ltlen <= bno, error0); | |
1da177e4 LT |
1751 | } |
1752 | } | |
1753 | /* | |
1754 | * Look for a neighboring block on the right (higher block numbers) | |
1755 | * that is contiguous with this space. | |
1756 | */ | |
637aa50f | 1757 | if ((error = xfs_btree_increment(bno_cur, 0, &haveright))) |
1da177e4 LT |
1758 | goto error0; |
1759 | if (haveright) { | |
1760 | /* | |
1761 | * There is a block to our right. | |
1762 | */ | |
1763 | if ((error = xfs_alloc_get_rec(bno_cur, >bno, >len, &i))) | |
1764 | goto error0; | |
c29aad41 | 1765 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
1da177e4 LT |
1766 | /* |
1767 | * It's not contiguous, though. | |
1768 | */ | |
1769 | if (bno + len < gtbno) | |
1770 | haveright = 0; | |
1771 | else { | |
1772 | /* | |
1773 | * If this failure happens the request to free this | |
1774 | * space was invalid, it's (partly) already free. | |
1775 | * Very bad. | |
1776 | */ | |
c29aad41 | 1777 | XFS_WANT_CORRUPTED_GOTO(mp, gtbno >= bno + len, error0); |
1da177e4 LT |
1778 | } |
1779 | } | |
1780 | /* | |
1781 | * Now allocate and initialize a cursor for the by-size tree. | |
1782 | */ | |
561f7d17 | 1783 | cnt_cur = xfs_allocbt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_CNT); |
1da177e4 LT |
1784 | /* |
1785 | * Have both left and right contiguous neighbors. | |
1786 | * Merge all three into a single free block. | |
1787 | */ | |
1788 | if (haveleft && haveright) { | |
1789 | /* | |
1790 | * Delete the old by-size entry on the left. | |
1791 | */ | |
1792 | if ((error = xfs_alloc_lookup_eq(cnt_cur, ltbno, ltlen, &i))) | |
1793 | goto error0; | |
c29aad41 | 1794 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
91cca5df | 1795 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
1da177e4 | 1796 | goto error0; |
c29aad41 | 1797 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
1da177e4 LT |
1798 | /* |
1799 | * Delete the old by-size entry on the right. | |
1800 | */ | |
1801 | if ((error = xfs_alloc_lookup_eq(cnt_cur, gtbno, gtlen, &i))) | |
1802 | goto error0; | |
c29aad41 | 1803 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
91cca5df | 1804 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
1da177e4 | 1805 | goto error0; |
c29aad41 | 1806 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
1da177e4 LT |
1807 | /* |
1808 | * Delete the old by-block entry for the right block. | |
1809 | */ | |
91cca5df | 1810 | if ((error = xfs_btree_delete(bno_cur, &i))) |
1da177e4 | 1811 | goto error0; |
c29aad41 | 1812 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
1da177e4 LT |
1813 | /* |
1814 | * Move the by-block cursor back to the left neighbor. | |
1815 | */ | |
8df4da4a | 1816 | if ((error = xfs_btree_decrement(bno_cur, 0, &i))) |
1da177e4 | 1817 | goto error0; |
c29aad41 | 1818 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
1da177e4 LT |
1819 | #ifdef DEBUG |
1820 | /* | |
1821 | * Check that this is the right record: delete didn't | |
1822 | * mangle the cursor. | |
1823 | */ | |
1824 | { | |
1825 | xfs_agblock_t xxbno; | |
1826 | xfs_extlen_t xxlen; | |
1827 | ||
1828 | if ((error = xfs_alloc_get_rec(bno_cur, &xxbno, &xxlen, | |
1829 | &i))) | |
1830 | goto error0; | |
c29aad41 | 1831 | XFS_WANT_CORRUPTED_GOTO(mp, |
1da177e4 LT |
1832 | i == 1 && xxbno == ltbno && xxlen == ltlen, |
1833 | error0); | |
1834 | } | |
1835 | #endif | |
1836 | /* | |
1837 | * Update remaining by-block entry to the new, joined block. | |
1838 | */ | |
1839 | nbno = ltbno; | |
1840 | nlen = len + ltlen + gtlen; | |
1841 | if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) | |
1842 | goto error0; | |
1843 | } | |
1844 | /* | |
1845 | * Have only a left contiguous neighbor. | |
1846 | * Merge it together with the new freespace. | |
1847 | */ | |
1848 | else if (haveleft) { | |
1849 | /* | |
1850 | * Delete the old by-size entry on the left. | |
1851 | */ | |
1852 | if ((error = xfs_alloc_lookup_eq(cnt_cur, ltbno, ltlen, &i))) | |
1853 | goto error0; | |
c29aad41 | 1854 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
91cca5df | 1855 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
1da177e4 | 1856 | goto error0; |
c29aad41 | 1857 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
1da177e4 LT |
1858 | /* |
1859 | * Back up the by-block cursor to the left neighbor, and | |
1860 | * update its length. | |
1861 | */ | |
8df4da4a | 1862 | if ((error = xfs_btree_decrement(bno_cur, 0, &i))) |
1da177e4 | 1863 | goto error0; |
c29aad41 | 1864 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
1da177e4 LT |
1865 | nbno = ltbno; |
1866 | nlen = len + ltlen; | |
1867 | if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) | |
1868 | goto error0; | |
1869 | } | |
1870 | /* | |
1871 | * Have only a right contiguous neighbor. | |
1872 | * Merge it together with the new freespace. | |
1873 | */ | |
1874 | else if (haveright) { | |
1875 | /* | |
1876 | * Delete the old by-size entry on the right. | |
1877 | */ | |
1878 | if ((error = xfs_alloc_lookup_eq(cnt_cur, gtbno, gtlen, &i))) | |
1879 | goto error0; | |
c29aad41 | 1880 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
91cca5df | 1881 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
1da177e4 | 1882 | goto error0; |
c29aad41 | 1883 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
1da177e4 LT |
1884 | /* |
1885 | * Update the starting block and length of the right | |
1886 | * neighbor in the by-block tree. | |
1887 | */ | |
1888 | nbno = bno; | |
1889 | nlen = len + gtlen; | |
1890 | if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) | |
1891 | goto error0; | |
1892 | } | |
1893 | /* | |
1894 | * No contiguous neighbors. | |
1895 | * Insert the new freespace into the by-block tree. | |
1896 | */ | |
1897 | else { | |
1898 | nbno = bno; | |
1899 | nlen = len; | |
4b22a571 | 1900 | if ((error = xfs_btree_insert(bno_cur, &i))) |
1da177e4 | 1901 | goto error0; |
c29aad41 | 1902 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
1da177e4 LT |
1903 | } |
1904 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
1905 | bno_cur = NULL; | |
1906 | /* | |
1907 | * In all cases we need to insert the new freespace in the by-size tree. | |
1908 | */ | |
1909 | if ((error = xfs_alloc_lookup_eq(cnt_cur, nbno, nlen, &i))) | |
1910 | goto error0; | |
c29aad41 | 1911 | XFS_WANT_CORRUPTED_GOTO(mp, i == 0, error0); |
4b22a571 | 1912 | if ((error = xfs_btree_insert(cnt_cur, &i))) |
1da177e4 | 1913 | goto error0; |
c29aad41 | 1914 | XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
1da177e4 LT |
1915 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
1916 | cnt_cur = NULL; | |
ecb6928f | 1917 | |
1da177e4 LT |
1918 | /* |
1919 | * Update the freespace totals in the ag and superblock. | |
1920 | */ | |
ecb6928f CH |
1921 | pag = xfs_perag_get(mp, agno); |
1922 | error = xfs_alloc_update_counters(tp, pag, agbp, len); | |
3fd129b6 | 1923 | xfs_ag_resv_free_extent(pag, type, tp, len); |
ecb6928f CH |
1924 | xfs_perag_put(pag); |
1925 | if (error) | |
1926 | goto error0; | |
1927 | ||
ff6d6af2 BD |
1928 | XFS_STATS_INC(mp, xs_freex); |
1929 | XFS_STATS_ADD(mp, xs_freeb, len); | |
0b1b213f | 1930 | |
21592863 | 1931 | trace_xfs_free_extent(mp, agno, bno, len, type, haveleft, haveright); |
1da177e4 | 1932 | |
1da177e4 LT |
1933 | return 0; |
1934 | ||
1935 | error0: | |
21592863 | 1936 | trace_xfs_free_extent(mp, agno, bno, len, type, -1, -1); |
1da177e4 LT |
1937 | if (bno_cur) |
1938 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); | |
1939 | if (cnt_cur) | |
1940 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); | |
1941 | return error; | |
1942 | } | |
1943 | ||
1944 | /* | |
1945 | * Visible (exported) allocation/free functions. | |
1946 | * Some of these are used just by xfs_alloc_btree.c and this file. | |
1947 | */ | |
1948 | ||
1949 | /* | |
1950 | * Compute and fill in value of m_ag_maxlevels. | |
1951 | */ | |
1952 | void | |
1953 | xfs_alloc_compute_maxlevels( | |
1954 | xfs_mount_t *mp) /* file system mount structure */ | |
1955 | { | |
a1f69417 | 1956 | mp->m_ag_maxlevels = xfs_btree_compute_maxlevels(mp->m_alloc_mnr, |
19b54ee6 | 1957 | (mp->m_sb.sb_agblocks + 1) / 2); |
1da177e4 LT |
1958 | } |
1959 | ||
6cc87645 | 1960 | /* |
3fd129b6 DW |
1961 | * Find the length of the longest extent in an AG. The 'need' parameter |
1962 | * specifies how much space we're going to need for the AGFL and the | |
1963 | * 'reserved' parameter tells us how many blocks in this AG are reserved for | |
1964 | * other callers. | |
6cc87645 DC |
1965 | */ |
1966 | xfs_extlen_t | |
1967 | xfs_alloc_longest_free_extent( | |
50adbcb4 | 1968 | struct xfs_perag *pag, |
3fd129b6 DW |
1969 | xfs_extlen_t need, |
1970 | xfs_extlen_t reserved) | |
6cc87645 | 1971 | { |
50adbcb4 | 1972 | xfs_extlen_t delta = 0; |
6cc87645 | 1973 | |
3fd129b6 DW |
1974 | /* |
1975 | * If the AGFL needs a recharge, we'll have to subtract that from the | |
1976 | * longest extent. | |
1977 | */ | |
6cc87645 DC |
1978 | if (need > pag->pagf_flcount) |
1979 | delta = need - pag->pagf_flcount; | |
1980 | ||
3fd129b6 DW |
1981 | /* |
1982 | * If we cannot maintain others' reservations with space from the | |
1983 | * not-longest freesp extents, we'll have to subtract /that/ from | |
1984 | * the longest extent too. | |
1985 | */ | |
1986 | if (pag->pagf_freeblks - pag->pagf_longest < reserved) | |
1987 | delta += reserved - (pag->pagf_freeblks - pag->pagf_longest); | |
1988 | ||
1989 | /* | |
1990 | * If the longest extent is long enough to satisfy all the | |
1991 | * reservations and AGFL rules in place, we can return this extent. | |
1992 | */ | |
6cc87645 DC |
1993 | if (pag->pagf_longest > delta) |
1994 | return pag->pagf_longest - delta; | |
3fd129b6 DW |
1995 | |
1996 | /* Otherwise, let the caller try for 1 block if there's space. */ | |
6cc87645 DC |
1997 | return pag->pagf_flcount > 0 || pag->pagf_longest > 0; |
1998 | } | |
1999 | ||
496817b4 DC |
2000 | unsigned int |
2001 | xfs_alloc_min_freelist( | |
2002 | struct xfs_mount *mp, | |
2003 | struct xfs_perag *pag) | |
2004 | { | |
2005 | unsigned int min_free; | |
2006 | ||
2007 | /* space needed by-bno freespace btree */ | |
2008 | min_free = min_t(unsigned int, pag->pagf_levels[XFS_BTNUM_BNOi] + 1, | |
2009 | mp->m_ag_maxlevels); | |
2010 | /* space needed by-size freespace btree */ | |
2011 | min_free += min_t(unsigned int, pag->pagf_levels[XFS_BTNUM_CNTi] + 1, | |
2012 | mp->m_ag_maxlevels); | |
52548852 DW |
2013 | /* space needed reverse mapping used space btree */ |
2014 | if (xfs_sb_version_hasrmapbt(&mp->m_sb)) | |
2015 | min_free += min_t(unsigned int, | |
2016 | pag->pagf_levels[XFS_BTNUM_RMAPi] + 1, | |
2017 | mp->m_rmap_maxlevels); | |
496817b4 DC |
2018 | |
2019 | return min_free; | |
2020 | } | |
2021 | ||
72d55285 DC |
2022 | /* |
2023 | * Check if the operation we are fixing up the freelist for should go ahead or | |
2024 | * not. If we are freeing blocks, we always allow it, otherwise the allocation | |
2025 | * is dependent on whether the size and shape of free space available will | |
2026 | * permit the requested allocation to take place. | |
2027 | */ | |
2028 | static bool | |
2029 | xfs_alloc_space_available( | |
2030 | struct xfs_alloc_arg *args, | |
2031 | xfs_extlen_t min_free, | |
2032 | int flags) | |
2033 | { | |
2034 | struct xfs_perag *pag = args->pag; | |
12ef8301 | 2035 | xfs_extlen_t alloc_len, longest; |
3fd129b6 | 2036 | xfs_extlen_t reservation; /* blocks that are still reserved */ |
72d55285 | 2037 | int available; |
1ca89fbc | 2038 | xfs_extlen_t agflcount; |
72d55285 DC |
2039 | |
2040 | if (flags & XFS_ALLOC_FLAG_FREEING) | |
2041 | return true; | |
2042 | ||
3fd129b6 DW |
2043 | reservation = xfs_ag_resv_needed(pag, args->resv); |
2044 | ||
72d55285 | 2045 | /* do we have enough contiguous free space for the allocation? */ |
12ef8301 | 2046 | alloc_len = args->minlen + (args->alignment - 1) + args->minalignslop; |
a1f69417 | 2047 | longest = xfs_alloc_longest_free_extent(pag, min_free, reservation); |
12ef8301 | 2048 | if (longest < alloc_len) |
72d55285 DC |
2049 | return false; |
2050 | ||
1ca89fbc BF |
2051 | /* |
2052 | * Do we have enough free space remaining for the allocation? Don't | |
2053 | * account extra agfl blocks because we are about to defer free them, | |
2054 | * making them unavailable until the current transaction commits. | |
2055 | */ | |
2056 | agflcount = min_t(xfs_extlen_t, pag->pagf_flcount, min_free); | |
2057 | available = (int)(pag->pagf_freeblks + agflcount - | |
54fee133 | 2058 | reservation - min_free - args->minleft); |
12ef8301 | 2059 | if (available < (int)max(args->total, alloc_len)) |
72d55285 DC |
2060 | return false; |
2061 | ||
54fee133 CH |
2062 | /* |
2063 | * Clamp maxlen to the amount of free space available for the actual | |
2064 | * extent allocation. | |
2065 | */ | |
2066 | if (available < (int)args->maxlen && !(flags & XFS_ALLOC_FLAG_CHECK)) { | |
2067 | args->maxlen = available; | |
2068 | ASSERT(args->maxlen > 0); | |
2069 | ASSERT(args->maxlen >= args->minlen); | |
2070 | } | |
2071 | ||
72d55285 DC |
2072 | return true; |
2073 | } | |
2074 | ||
4223f659 BF |
2075 | int |
2076 | xfs_free_agfl_block( | |
2077 | struct xfs_trans *tp, | |
2078 | xfs_agnumber_t agno, | |
2079 | xfs_agblock_t agbno, | |
2080 | struct xfs_buf *agbp, | |
2081 | struct xfs_owner_info *oinfo) | |
2082 | { | |
2083 | int error; | |
2084 | struct xfs_buf *bp; | |
2085 | ||
2086 | error = xfs_free_ag_extent(tp, agbp, agno, agbno, 1, oinfo, | |
2087 | XFS_AG_RESV_AGFL); | |
2088 | if (error) | |
2089 | return error; | |
2090 | ||
f5b999c0 | 2091 | bp = xfs_btree_get_bufs(tp->t_mountp, tp, agno, agbno); |
4223f659 BF |
2092 | if (!bp) |
2093 | return -EFSCORRUPTED; | |
2094 | xfs_trans_binval(tp, bp); | |
2095 | ||
2096 | return 0; | |
2097 | } | |
2098 | ||
a27ba260 BF |
2099 | /* |
2100 | * Check the agfl fields of the agf for inconsistency or corruption. The purpose | |
2101 | * is to detect an agfl header padding mismatch between current and early v5 | |
2102 | * kernels. This problem manifests as a 1-slot size difference between the | |
2103 | * on-disk flcount and the active [first, last] range of a wrapped agfl. This | |
2104 | * may also catch variants of agfl count corruption unrelated to padding. Either | |
2105 | * way, we'll reset the agfl and warn the user. | |
2106 | * | |
2107 | * Return true if a reset is required before the agfl can be used, false | |
2108 | * otherwise. | |
2109 | */ | |
2110 | static bool | |
2111 | xfs_agfl_needs_reset( | |
2112 | struct xfs_mount *mp, | |
2113 | struct xfs_agf *agf) | |
2114 | { | |
2115 | uint32_t f = be32_to_cpu(agf->agf_flfirst); | |
2116 | uint32_t l = be32_to_cpu(agf->agf_fllast); | |
2117 | uint32_t c = be32_to_cpu(agf->agf_flcount); | |
2118 | int agfl_size = xfs_agfl_size(mp); | |
2119 | int active; | |
2120 | ||
2121 | /* no agfl header on v4 supers */ | |
2122 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
2123 | return false; | |
2124 | ||
2125 | /* | |
2126 | * The agf read verifier catches severe corruption of these fields. | |
2127 | * Repeat some sanity checks to cover a packed -> unpacked mismatch if | |
2128 | * the verifier allows it. | |
2129 | */ | |
2130 | if (f >= agfl_size || l >= agfl_size) | |
2131 | return true; | |
2132 | if (c > agfl_size) | |
2133 | return true; | |
2134 | ||
2135 | /* | |
2136 | * Check consistency between the on-disk count and the active range. An | |
2137 | * agfl padding mismatch manifests as an inconsistent flcount. | |
2138 | */ | |
2139 | if (c && l >= f) | |
2140 | active = l - f + 1; | |
2141 | else if (c) | |
2142 | active = agfl_size - f + l + 1; | |
2143 | else | |
2144 | active = 0; | |
2145 | ||
2146 | return active != c; | |
2147 | } | |
2148 | ||
2149 | /* | |
2150 | * Reset the agfl to an empty state. Ignore/drop any existing blocks since the | |
2151 | * agfl content cannot be trusted. Warn the user that a repair is required to | |
2152 | * recover leaked blocks. | |
2153 | * | |
2154 | * The purpose of this mechanism is to handle filesystems affected by the agfl | |
2155 | * header padding mismatch problem. A reset keeps the filesystem online with a | |
2156 | * relatively minor free space accounting inconsistency rather than suffer the | |
2157 | * inevitable crash from use of an invalid agfl block. | |
2158 | */ | |
2159 | static void | |
2160 | xfs_agfl_reset( | |
2161 | struct xfs_trans *tp, | |
2162 | struct xfs_buf *agbp, | |
2163 | struct xfs_perag *pag) | |
2164 | { | |
2165 | struct xfs_mount *mp = tp->t_mountp; | |
2166 | struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); | |
2167 | ||
2168 | ASSERT(pag->pagf_agflreset); | |
2169 | trace_xfs_agfl_reset(mp, agf, 0, _RET_IP_); | |
2170 | ||
2171 | xfs_warn(mp, | |
2172 | "WARNING: Reset corrupted AGFL on AG %u. %d blocks leaked. " | |
2173 | "Please unmount and run xfs_repair.", | |
2174 | pag->pag_agno, pag->pagf_flcount); | |
2175 | ||
2176 | agf->agf_flfirst = 0; | |
2177 | agf->agf_fllast = cpu_to_be32(xfs_agfl_size(mp) - 1); | |
2178 | agf->agf_flcount = 0; | |
2179 | xfs_alloc_log_agf(tp, agbp, XFS_AGF_FLFIRST | XFS_AGF_FLLAST | | |
2180 | XFS_AGF_FLCOUNT); | |
2181 | ||
2182 | pag->pagf_flcount = 0; | |
2183 | pag->pagf_agflreset = false; | |
2184 | } | |
2185 | ||
f8f2835a BF |
2186 | /* |
2187 | * Defer an AGFL block free. This is effectively equivalent to | |
2188 | * xfs_bmap_add_free() with some special handling particular to AGFL blocks. | |
2189 | * | |
2190 | * Deferring AGFL frees helps prevent log reservation overruns due to too many | |
2191 | * allocation operations in a transaction. AGFL frees are prone to this problem | |
2192 | * because for one they are always freed one at a time. Further, an immediate | |
2193 | * AGFL block free can cause a btree join and require another block free before | |
2194 | * the real allocation can proceed. Deferring the free disconnects freeing up | |
2195 | * the AGFL slot from freeing the block. | |
2196 | */ | |
2197 | STATIC void | |
2198 | xfs_defer_agfl_block( | |
0f37d178 | 2199 | struct xfs_trans *tp, |
f8f2835a BF |
2200 | xfs_agnumber_t agno, |
2201 | xfs_fsblock_t agbno, | |
2202 | struct xfs_owner_info *oinfo) | |
2203 | { | |
0f37d178 | 2204 | struct xfs_mount *mp = tp->t_mountp; |
f8f2835a BF |
2205 | struct xfs_extent_free_item *new; /* new element */ |
2206 | ||
2207 | ASSERT(xfs_bmap_free_item_zone != NULL); | |
2208 | ASSERT(oinfo != NULL); | |
2209 | ||
2210 | new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP); | |
2211 | new->xefi_startblock = XFS_AGB_TO_FSB(mp, agno, agbno); | |
2212 | new->xefi_blockcount = 1; | |
2213 | new->xefi_oinfo = *oinfo; | |
2214 | ||
2215 | trace_xfs_agfl_free_defer(mp, agno, 0, agbno, 1); | |
2216 | ||
0f37d178 | 2217 | xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_AGFL_FREE, &new->xefi_list); |
f8f2835a BF |
2218 | } |
2219 | ||
1da177e4 LT |
2220 | /* |
2221 | * Decide whether to use this allocation group for this allocation. | |
2222 | * If so, fix up the btree freelist's size. | |
2223 | */ | |
2e9101da | 2224 | int /* error */ |
1da177e4 | 2225 | xfs_alloc_fix_freelist( |
396503fc DC |
2226 | struct xfs_alloc_arg *args, /* allocation argument structure */ |
2227 | int flags) /* XFS_ALLOC_FLAG_... */ | |
1da177e4 | 2228 | { |
396503fc DC |
2229 | struct xfs_mount *mp = args->mp; |
2230 | struct xfs_perag *pag = args->pag; | |
2231 | struct xfs_trans *tp = args->tp; | |
2232 | struct xfs_buf *agbp = NULL; | |
2233 | struct xfs_buf *agflbp = NULL; | |
2234 | struct xfs_alloc_arg targs; /* local allocation arguments */ | |
2235 | xfs_agblock_t bno; /* freelist block */ | |
2236 | xfs_extlen_t need; /* total blocks needed in freelist */ | |
c184f855 | 2237 | int error = 0; |
396503fc | 2238 | |
362f5e74 BF |
2239 | /* deferred ops (AGFL block frees) require permanent transactions */ |
2240 | ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); | |
2241 | ||
1da177e4 | 2242 | if (!pag->pagf_init) { |
396503fc DC |
2243 | error = xfs_alloc_read_agf(mp, tp, args->agno, flags, &agbp); |
2244 | if (error) | |
2245 | goto out_no_agbp; | |
1da177e4 | 2246 | if (!pag->pagf_init) { |
0e1edbd9 NS |
2247 | ASSERT(flags & XFS_ALLOC_FLAG_TRYLOCK); |
2248 | ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); | |
396503fc | 2249 | goto out_agbp_relse; |
1da177e4 | 2250 | } |
396503fc | 2251 | } |
1da177e4 | 2252 | |
0e1edbd9 | 2253 | /* |
396503fc DC |
2254 | * If this is a metadata preferred pag and we are user data then try |
2255 | * somewhere else if we are not being asked to try harder at this | |
2256 | * point | |
1da177e4 | 2257 | */ |
292378ed | 2258 | if (pag->pagf_metadata && xfs_alloc_is_userdata(args->datatype) && |
0e1edbd9 NS |
2259 | (flags & XFS_ALLOC_FLAG_TRYLOCK)) { |
2260 | ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); | |
396503fc | 2261 | goto out_agbp_relse; |
1da177e4 LT |
2262 | } |
2263 | ||
496817b4 | 2264 | need = xfs_alloc_min_freelist(mp, pag); |
54fee133 CH |
2265 | if (!xfs_alloc_space_available(args, need, flags | |
2266 | XFS_ALLOC_FLAG_CHECK)) | |
396503fc | 2267 | goto out_agbp_relse; |
0e1edbd9 | 2268 | |
1da177e4 LT |
2269 | /* |
2270 | * Get the a.g. freespace buffer. | |
2271 | * Can fail if we're not blocking on locks, and it's held. | |
2272 | */ | |
396503fc DC |
2273 | if (!agbp) { |
2274 | error = xfs_alloc_read_agf(mp, tp, args->agno, flags, &agbp); | |
2275 | if (error) | |
2276 | goto out_no_agbp; | |
2277 | if (!agbp) { | |
0e1edbd9 NS |
2278 | ASSERT(flags & XFS_ALLOC_FLAG_TRYLOCK); |
2279 | ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); | |
396503fc | 2280 | goto out_no_agbp; |
0e1edbd9 | 2281 | } |
1da177e4 | 2282 | } |
50adbcb4 | 2283 | |
a27ba260 BF |
2284 | /* reset a padding mismatched agfl before final free space check */ |
2285 | if (pag->pagf_agflreset) | |
2286 | xfs_agfl_reset(tp, agbp, pag); | |
2287 | ||
50adbcb4 | 2288 | /* If there isn't enough total space or single-extent, reject it. */ |
496817b4 | 2289 | need = xfs_alloc_min_freelist(mp, pag); |
396503fc DC |
2290 | if (!xfs_alloc_space_available(args, need, flags)) |
2291 | goto out_agbp_relse; | |
72d55285 | 2292 | |
1da177e4 LT |
2293 | /* |
2294 | * Make the freelist shorter if it's too long. | |
50adbcb4 | 2295 | * |
396503fc DC |
2296 | * Note that from this point onwards, we will always release the agf and |
2297 | * agfl buffers on error. This handles the case where we error out and | |
2298 | * the buffers are clean or may not have been joined to the transaction | |
2299 | * and hence need to be released manually. If they have been joined to | |
2300 | * the transaction, then xfs_trans_brelse() will handle them | |
2301 | * appropriately based on the recursion count and dirty state of the | |
2302 | * buffer. | |
2303 | * | |
50adbcb4 DC |
2304 | * XXX (dgc): When we have lots of free space, does this buy us |
2305 | * anything other than extra overhead when we need to put more blocks | |
2306 | * back on the free list? Maybe we should only do this when space is | |
2307 | * getting low or the AGFL is more than half full? | |
04f13060 DW |
2308 | * |
2309 | * The NOSHRINK flag prevents the AGFL from being shrunk if it's too | |
2310 | * big; the NORMAP flag prevents AGFL expand/shrink operations from | |
2311 | * updating the rmapbt. Both flags are used in xfs_repair while we're | |
2312 | * rebuilding the rmapbt, and neither are used by the kernel. They're | |
2313 | * both required to ensure that rmaps are correctly recorded for the | |
2314 | * regenerated AGFL, bnobt, and cntbt. See repair/phase5.c and | |
2315 | * repair/rmap.c in xfsprogs for details. | |
1da177e4 | 2316 | */ |
04f13060 | 2317 | memset(&targs, 0, sizeof(targs)); |
7280feda | 2318 | /* struct copy below */ |
04f13060 | 2319 | if (flags & XFS_ALLOC_FLAG_NORMAP) |
7280feda | 2320 | targs.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE; |
04f13060 | 2321 | else |
7280feda | 2322 | targs.oinfo = XFS_RMAP_OINFO_AG; |
04f13060 | 2323 | while (!(flags & XFS_ALLOC_FLAG_NOSHRINK) && pag->pagf_flcount > need) { |
92821e2b DC |
2324 | error = xfs_alloc_get_freelist(tp, agbp, &bno, 0); |
2325 | if (error) | |
396503fc | 2326 | goto out_agbp_relse; |
4223f659 | 2327 | |
c03edc9e BF |
2328 | /* defer agfl frees */ |
2329 | xfs_defer_agfl_block(tp, args->agno, bno, &targs.oinfo); | |
1da177e4 | 2330 | } |
50adbcb4 | 2331 | |
1da177e4 LT |
2332 | targs.tp = tp; |
2333 | targs.mp = mp; | |
2334 | targs.agbp = agbp; | |
2335 | targs.agno = args->agno; | |
3fd129b6 | 2336 | targs.alignment = targs.minlen = targs.prod = 1; |
1da177e4 LT |
2337 | targs.type = XFS_ALLOCTYPE_THIS_AG; |
2338 | targs.pag = pag; | |
50adbcb4 DC |
2339 | error = xfs_alloc_read_agfl(mp, tp, targs.agno, &agflbp); |
2340 | if (error) | |
396503fc | 2341 | goto out_agbp_relse; |
50adbcb4 DC |
2342 | |
2343 | /* Make the freelist longer if it's too short. */ | |
2344 | while (pag->pagf_flcount < need) { | |
1da177e4 | 2345 | targs.agbno = 0; |
50adbcb4 | 2346 | targs.maxlen = need - pag->pagf_flcount; |
0ab32086 | 2347 | targs.resv = XFS_AG_RESV_AGFL; |
50adbcb4 DC |
2348 | |
2349 | /* Allocate as many blocks as possible at once. */ | |
2350 | error = xfs_alloc_ag_vextent(&targs); | |
396503fc DC |
2351 | if (error) |
2352 | goto out_agflbp_relse; | |
2353 | ||
1da177e4 LT |
2354 | /* |
2355 | * Stop if we run out. Won't happen if callers are obeying | |
2356 | * the restrictions correctly. Can happen for free calls | |
2357 | * on a completely full ag. | |
2358 | */ | |
d210a28c | 2359 | if (targs.agbno == NULLAGBLOCK) { |
0e1edbd9 NS |
2360 | if (flags & XFS_ALLOC_FLAG_FREEING) |
2361 | break; | |
396503fc | 2362 | goto out_agflbp_relse; |
d210a28c | 2363 | } |
1da177e4 LT |
2364 | /* |
2365 | * Put each allocated block on the list. | |
2366 | */ | |
2367 | for (bno = targs.agbno; bno < targs.agbno + targs.len; bno++) { | |
92821e2b DC |
2368 | error = xfs_alloc_put_freelist(tp, agbp, |
2369 | agflbp, bno, 0); | |
2370 | if (error) | |
396503fc | 2371 | goto out_agflbp_relse; |
1da177e4 LT |
2372 | } |
2373 | } | |
e63a3690 | 2374 | xfs_trans_brelse(tp, agflbp); |
1da177e4 LT |
2375 | args->agbp = agbp; |
2376 | return 0; | |
396503fc DC |
2377 | |
2378 | out_agflbp_relse: | |
2379 | xfs_trans_brelse(tp, agflbp); | |
2380 | out_agbp_relse: | |
2381 | if (agbp) | |
2382 | xfs_trans_brelse(tp, agbp); | |
2383 | out_no_agbp: | |
2384 | args->agbp = NULL; | |
2385 | return error; | |
1da177e4 LT |
2386 | } |
2387 | ||
2388 | /* | |
2389 | * Get a block from the freelist. | |
2390 | * Returns with the buffer for the block gotten. | |
2391 | */ | |
2392 | int /* error */ | |
2393 | xfs_alloc_get_freelist( | |
2394 | xfs_trans_t *tp, /* transaction pointer */ | |
2395 | xfs_buf_t *agbp, /* buffer containing the agf structure */ | |
92821e2b DC |
2396 | xfs_agblock_t *bnop, /* block address retrieved from freelist */ |
2397 | int btreeblk) /* destination is a AGF btree */ | |
1da177e4 LT |
2398 | { |
2399 | xfs_agf_t *agf; /* a.g. freespace structure */ | |
1da177e4 LT |
2400 | xfs_buf_t *agflbp;/* buffer for a.g. freelist structure */ |
2401 | xfs_agblock_t bno; /* block number returned */ | |
77c95bba | 2402 | __be32 *agfl_bno; |
1da177e4 | 2403 | int error; |
92821e2b | 2404 | int logflags; |
77c95bba | 2405 | xfs_mount_t *mp = tp->t_mountp; |
1da177e4 LT |
2406 | xfs_perag_t *pag; /* per allocation group data */ |
2407 | ||
1da177e4 LT |
2408 | /* |
2409 | * Freelist is empty, give up. | |
2410 | */ | |
77c95bba | 2411 | agf = XFS_BUF_TO_AGF(agbp); |
1da177e4 LT |
2412 | if (!agf->agf_flcount) { |
2413 | *bnop = NULLAGBLOCK; | |
2414 | return 0; | |
2415 | } | |
2416 | /* | |
2417 | * Read the array of free blocks. | |
2418 | */ | |
77c95bba CH |
2419 | error = xfs_alloc_read_agfl(mp, tp, be32_to_cpu(agf->agf_seqno), |
2420 | &agflbp); | |
2421 | if (error) | |
1da177e4 | 2422 | return error; |
77c95bba CH |
2423 | |
2424 | ||
1da177e4 LT |
2425 | /* |
2426 | * Get the block number and update the data structures. | |
2427 | */ | |
77c95bba CH |
2428 | agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp); |
2429 | bno = be32_to_cpu(agfl_bno[be32_to_cpu(agf->agf_flfirst)]); | |
413d57c9 | 2430 | be32_add_cpu(&agf->agf_flfirst, 1); |
1da177e4 | 2431 | xfs_trans_brelse(tp, agflbp); |
a78ee256 | 2432 | if (be32_to_cpu(agf->agf_flfirst) == xfs_agfl_size(mp)) |
1da177e4 | 2433 | agf->agf_flfirst = 0; |
a862e0fd DC |
2434 | |
2435 | pag = xfs_perag_get(mp, be32_to_cpu(agf->agf_seqno)); | |
a27ba260 | 2436 | ASSERT(!pag->pagf_agflreset); |
413d57c9 | 2437 | be32_add_cpu(&agf->agf_flcount, -1); |
1da177e4 LT |
2438 | xfs_trans_agflist_delta(tp, -1); |
2439 | pag->pagf_flcount--; | |
92821e2b DC |
2440 | |
2441 | logflags = XFS_AGF_FLFIRST | XFS_AGF_FLCOUNT; | |
2442 | if (btreeblk) { | |
413d57c9 | 2443 | be32_add_cpu(&agf->agf_btreeblks, 1); |
92821e2b DC |
2444 | pag->pagf_btreeblks++; |
2445 | logflags |= XFS_AGF_BTREEBLKS; | |
2446 | } | |
fe5ed6c2 | 2447 | xfs_perag_put(pag); |
92821e2b | 2448 | |
92821e2b | 2449 | xfs_alloc_log_agf(tp, agbp, logflags); |
1da177e4 LT |
2450 | *bnop = bno; |
2451 | ||
1da177e4 LT |
2452 | return 0; |
2453 | } | |
2454 | ||
2455 | /* | |
2456 | * Log the given fields from the agf structure. | |
2457 | */ | |
2458 | void | |
2459 | xfs_alloc_log_agf( | |
2460 | xfs_trans_t *tp, /* transaction pointer */ | |
2461 | xfs_buf_t *bp, /* buffer for a.g. freelist header */ | |
2462 | int fields) /* mask of fields to be logged (XFS_AGF_...) */ | |
2463 | { | |
2464 | int first; /* first byte offset */ | |
2465 | int last; /* last byte offset */ | |
2466 | static const short offsets[] = { | |
2467 | offsetof(xfs_agf_t, agf_magicnum), | |
2468 | offsetof(xfs_agf_t, agf_versionnum), | |
2469 | offsetof(xfs_agf_t, agf_seqno), | |
2470 | offsetof(xfs_agf_t, agf_length), | |
2471 | offsetof(xfs_agf_t, agf_roots[0]), | |
2472 | offsetof(xfs_agf_t, agf_levels[0]), | |
2473 | offsetof(xfs_agf_t, agf_flfirst), | |
2474 | offsetof(xfs_agf_t, agf_fllast), | |
2475 | offsetof(xfs_agf_t, agf_flcount), | |
2476 | offsetof(xfs_agf_t, agf_freeblks), | |
2477 | offsetof(xfs_agf_t, agf_longest), | |
92821e2b | 2478 | offsetof(xfs_agf_t, agf_btreeblks), |
4e0e6040 | 2479 | offsetof(xfs_agf_t, agf_uuid), |
f32866fd | 2480 | offsetof(xfs_agf_t, agf_rmap_blocks), |
bdf28630 DW |
2481 | offsetof(xfs_agf_t, agf_refcount_blocks), |
2482 | offsetof(xfs_agf_t, agf_refcount_root), | |
2483 | offsetof(xfs_agf_t, agf_refcount_level), | |
da1f039d DW |
2484 | /* needed so that we don't log the whole rest of the structure: */ |
2485 | offsetof(xfs_agf_t, agf_spare64), | |
1da177e4 LT |
2486 | sizeof(xfs_agf_t) |
2487 | }; | |
2488 | ||
0b1b213f CH |
2489 | trace_xfs_agf(tp->t_mountp, XFS_BUF_TO_AGF(bp), fields, _RET_IP_); |
2490 | ||
61fe135c | 2491 | xfs_trans_buf_set_type(tp, bp, XFS_BLFT_AGF_BUF); |
4e0e6040 | 2492 | |
1da177e4 LT |
2493 | xfs_btree_offsets(fields, offsets, XFS_AGF_NUM_BITS, &first, &last); |
2494 | xfs_trans_log_buf(tp, bp, (uint)first, (uint)last); | |
2495 | } | |
2496 | ||
2497 | /* | |
2498 | * Interface for inode allocation to force the pag data to be initialized. | |
2499 | */ | |
2500 | int /* error */ | |
2501 | xfs_alloc_pagf_init( | |
2502 | xfs_mount_t *mp, /* file system mount structure */ | |
2503 | xfs_trans_t *tp, /* transaction pointer */ | |
2504 | xfs_agnumber_t agno, /* allocation group number */ | |
2505 | int flags) /* XFS_ALLOC_FLAGS_... */ | |
2506 | { | |
2507 | xfs_buf_t *bp; | |
2508 | int error; | |
2509 | ||
2510 | if ((error = xfs_alloc_read_agf(mp, tp, agno, flags, &bp))) | |
2511 | return error; | |
2512 | if (bp) | |
2513 | xfs_trans_brelse(tp, bp); | |
2514 | return 0; | |
2515 | } | |
2516 | ||
2517 | /* | |
2518 | * Put the block on the freelist for the allocation group. | |
2519 | */ | |
2520 | int /* error */ | |
2521 | xfs_alloc_put_freelist( | |
2522 | xfs_trans_t *tp, /* transaction pointer */ | |
2523 | xfs_buf_t *agbp, /* buffer for a.g. freelist header */ | |
2524 | xfs_buf_t *agflbp,/* buffer for a.g. free block array */ | |
92821e2b DC |
2525 | xfs_agblock_t bno, /* block being freed */ |
2526 | int btreeblk) /* block came from a AGF btree */ | |
1da177e4 LT |
2527 | { |
2528 | xfs_agf_t *agf; /* a.g. freespace structure */ | |
e2101005 | 2529 | __be32 *blockp;/* pointer to array entry */ |
1da177e4 | 2530 | int error; |
92821e2b | 2531 | int logflags; |
1da177e4 LT |
2532 | xfs_mount_t *mp; /* mount structure */ |
2533 | xfs_perag_t *pag; /* per allocation group data */ | |
77c95bba CH |
2534 | __be32 *agfl_bno; |
2535 | int startoff; | |
1da177e4 LT |
2536 | |
2537 | agf = XFS_BUF_TO_AGF(agbp); | |
2538 | mp = tp->t_mountp; | |
2539 | ||
2540 | if (!agflbp && (error = xfs_alloc_read_agfl(mp, tp, | |
16259e7d | 2541 | be32_to_cpu(agf->agf_seqno), &agflbp))) |
1da177e4 | 2542 | return error; |
413d57c9 | 2543 | be32_add_cpu(&agf->agf_fllast, 1); |
a78ee256 | 2544 | if (be32_to_cpu(agf->agf_fllast) == xfs_agfl_size(mp)) |
1da177e4 | 2545 | agf->agf_fllast = 0; |
a862e0fd DC |
2546 | |
2547 | pag = xfs_perag_get(mp, be32_to_cpu(agf->agf_seqno)); | |
a27ba260 | 2548 | ASSERT(!pag->pagf_agflreset); |
413d57c9 | 2549 | be32_add_cpu(&agf->agf_flcount, 1); |
1da177e4 LT |
2550 | xfs_trans_agflist_delta(tp, 1); |
2551 | pag->pagf_flcount++; | |
92821e2b DC |
2552 | |
2553 | logflags = XFS_AGF_FLLAST | XFS_AGF_FLCOUNT; | |
2554 | if (btreeblk) { | |
413d57c9 | 2555 | be32_add_cpu(&agf->agf_btreeblks, -1); |
92821e2b DC |
2556 | pag->pagf_btreeblks--; |
2557 | logflags |= XFS_AGF_BTREEBLKS; | |
2558 | } | |
a862e0fd | 2559 | xfs_perag_put(pag); |
92821e2b | 2560 | |
92821e2b DC |
2561 | xfs_alloc_log_agf(tp, agbp, logflags); |
2562 | ||
a78ee256 | 2563 | ASSERT(be32_to_cpu(agf->agf_flcount) <= xfs_agfl_size(mp)); |
77c95bba CH |
2564 | |
2565 | agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp); | |
2566 | blockp = &agfl_bno[be32_to_cpu(agf->agf_fllast)]; | |
e2101005 | 2567 | *blockp = cpu_to_be32(bno); |
77c95bba CH |
2568 | startoff = (char *)blockp - (char *)agflbp->b_addr; |
2569 | ||
92821e2b | 2570 | xfs_alloc_log_agf(tp, agbp, logflags); |
77c95bba | 2571 | |
61fe135c | 2572 | xfs_trans_buf_set_type(tp, agflbp, XFS_BLFT_AGFL_BUF); |
77c95bba CH |
2573 | xfs_trans_log_buf(tp, agflbp, startoff, |
2574 | startoff + sizeof(xfs_agblock_t) - 1); | |
1da177e4 LT |
2575 | return 0; |
2576 | } | |
2577 | ||
a6a781a5 | 2578 | static xfs_failaddr_t |
612cfbfe | 2579 | xfs_agf_verify( |
b5572597 DW |
2580 | struct xfs_buf *bp) |
2581 | { | |
dbd329f1 | 2582 | struct xfs_mount *mp = bp->b_mount; |
b5572597 | 2583 | struct xfs_agf *agf = XFS_BUF_TO_AGF(bp); |
5d5f527d | 2584 | |
a45086e2 BF |
2585 | if (xfs_sb_version_hascrc(&mp->m_sb)) { |
2586 | if (!uuid_equal(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid)) | |
a6a781a5 | 2587 | return __this_address; |
a45086e2 BF |
2588 | if (!xfs_log_check_lsn(mp, |
2589 | be64_to_cpu(XFS_BUF_TO_AGF(bp)->agf_lsn))) | |
a6a781a5 | 2590 | return __this_address; |
a45086e2 | 2591 | } |
5d5f527d | 2592 | |
39708c20 BF |
2593 | if (!xfs_verify_magic(bp, agf->agf_magicnum)) |
2594 | return __this_address; | |
2595 | ||
2596 | if (!(XFS_AGF_GOOD_VERSION(be32_to_cpu(agf->agf_versionnum)) && | |
4e0e6040 | 2597 | be32_to_cpu(agf->agf_freeblks) <= be32_to_cpu(agf->agf_length) && |
a78ee256 DC |
2598 | be32_to_cpu(agf->agf_flfirst) < xfs_agfl_size(mp) && |
2599 | be32_to_cpu(agf->agf_fllast) < xfs_agfl_size(mp) && | |
2600 | be32_to_cpu(agf->agf_flcount) <= xfs_agfl_size(mp))) | |
a6a781a5 | 2601 | return __this_address; |
5d5f527d | 2602 | |
d2a047f3 DW |
2603 | if (be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]) < 1 || |
2604 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]) < 1 || | |
2605 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]) > XFS_BTREE_MAXLEVELS || | |
e1b05723 | 2606 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]) > XFS_BTREE_MAXLEVELS) |
a6a781a5 | 2607 | return __this_address; |
e1b05723 | 2608 | |
b8704944 | 2609 | if (xfs_sb_version_hasrmapbt(&mp->m_sb) && |
d2a047f3 DW |
2610 | (be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]) < 1 || |
2611 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]) > XFS_BTREE_MAXLEVELS)) | |
a6a781a5 | 2612 | return __this_address; |
b8704944 | 2613 | |
5d5f527d DC |
2614 | /* |
2615 | * during growfs operations, the perag is not fully initialised, | |
2616 | * so we can't use it for any useful checking. growfs ensures we can't | |
2617 | * use it by using uncached buffers that don't have the perag attached | |
2618 | * so we can detect and avoid this problem. | |
2619 | */ | |
4e0e6040 | 2620 | if (bp->b_pag && be32_to_cpu(agf->agf_seqno) != bp->b_pag->pag_agno) |
a6a781a5 | 2621 | return __this_address; |
5d5f527d | 2622 | |
4e0e6040 DC |
2623 | if (xfs_sb_version_haslazysbcount(&mp->m_sb) && |
2624 | be32_to_cpu(agf->agf_btreeblks) > be32_to_cpu(agf->agf_length)) | |
a6a781a5 | 2625 | return __this_address; |
4e0e6040 | 2626 | |
46eeb521 | 2627 | if (xfs_sb_version_hasreflink(&mp->m_sb) && |
d2a047f3 DW |
2628 | (be32_to_cpu(agf->agf_refcount_level) < 1 || |
2629 | be32_to_cpu(agf->agf_refcount_level) > XFS_BTREE_MAXLEVELS)) | |
a6a781a5 | 2630 | return __this_address; |
46eeb521 | 2631 | |
a6a781a5 | 2632 | return NULL; |
5d5f527d | 2633 | |
612cfbfe DC |
2634 | } |
2635 | ||
1813dd64 DC |
2636 | static void |
2637 | xfs_agf_read_verify( | |
612cfbfe DC |
2638 | struct xfs_buf *bp) |
2639 | { | |
dbd329f1 | 2640 | struct xfs_mount *mp = bp->b_mount; |
bc1a09b8 | 2641 | xfs_failaddr_t fa; |
4e0e6040 | 2642 | |
ce5028cf ES |
2643 | if (xfs_sb_version_hascrc(&mp->m_sb) && |
2644 | !xfs_buf_verify_cksum(bp, XFS_AGF_CRC_OFF)) | |
bc1a09b8 DW |
2645 | xfs_verifier_error(bp, -EFSBADCRC, __this_address); |
2646 | else { | |
b5572597 | 2647 | fa = xfs_agf_verify(bp); |
bc1a09b8 DW |
2648 | if (XFS_TEST_ERROR(fa, mp, XFS_ERRTAG_ALLOC_READ_AGF)) |
2649 | xfs_verifier_error(bp, -EFSCORRUPTED, fa); | |
2650 | } | |
612cfbfe | 2651 | } |
5d5f527d | 2652 | |
b0f539de | 2653 | static void |
1813dd64 | 2654 | xfs_agf_write_verify( |
612cfbfe DC |
2655 | struct xfs_buf *bp) |
2656 | { | |
dbd329f1 | 2657 | struct xfs_mount *mp = bp->b_mount; |
fb1755a6 | 2658 | struct xfs_buf_log_item *bip = bp->b_log_item; |
bc1a09b8 | 2659 | xfs_failaddr_t fa; |
4e0e6040 | 2660 | |
b5572597 | 2661 | fa = xfs_agf_verify(bp); |
bc1a09b8 DW |
2662 | if (fa) { |
2663 | xfs_verifier_error(bp, -EFSCORRUPTED, fa); | |
4e0e6040 DC |
2664 | return; |
2665 | } | |
2666 | ||
2667 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
2668 | return; | |
2669 | ||
2670 | if (bip) | |
2671 | XFS_BUF_TO_AGF(bp)->agf_lsn = cpu_to_be64(bip->bli_item.li_lsn); | |
2672 | ||
f1dbcd7e | 2673 | xfs_buf_update_cksum(bp, XFS_AGF_CRC_OFF); |
5d5f527d DC |
2674 | } |
2675 | ||
1813dd64 | 2676 | const struct xfs_buf_ops xfs_agf_buf_ops = { |
233135b7 | 2677 | .name = "xfs_agf", |
39708c20 | 2678 | .magic = { cpu_to_be32(XFS_AGF_MAGIC), cpu_to_be32(XFS_AGF_MAGIC) }, |
1813dd64 DC |
2679 | .verify_read = xfs_agf_read_verify, |
2680 | .verify_write = xfs_agf_write_verify, | |
b5572597 | 2681 | .verify_struct = xfs_agf_verify, |
1813dd64 DC |
2682 | }; |
2683 | ||
1da177e4 LT |
2684 | /* |
2685 | * Read in the allocation group header (free/alloc section). | |
2686 | */ | |
2687 | int /* error */ | |
4805621a CH |
2688 | xfs_read_agf( |
2689 | struct xfs_mount *mp, /* mount point structure */ | |
2690 | struct xfs_trans *tp, /* transaction pointer */ | |
2691 | xfs_agnumber_t agno, /* allocation group number */ | |
2692 | int flags, /* XFS_BUF_ */ | |
2693 | struct xfs_buf **bpp) /* buffer for the ag freelist header */ | |
1da177e4 | 2694 | { |
1da177e4 LT |
2695 | int error; |
2696 | ||
d123031a DC |
2697 | trace_xfs_read_agf(mp, agno); |
2698 | ||
1da177e4 LT |
2699 | ASSERT(agno != NULLAGNUMBER); |
2700 | error = xfs_trans_read_buf( | |
2701 | mp, tp, mp->m_ddev_targp, | |
2702 | XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), | |
1813dd64 | 2703 | XFS_FSS_TO_BB(mp, 1), flags, bpp, &xfs_agf_buf_ops); |
1da177e4 LT |
2704 | if (error) |
2705 | return error; | |
4805621a | 2706 | if (!*bpp) |
1da177e4 | 2707 | return 0; |
4805621a | 2708 | |
5a52c2a5 | 2709 | ASSERT(!(*bpp)->b_error); |
38f23232 | 2710 | xfs_buf_set_ref(*bpp, XFS_AGF_REF); |
4805621a CH |
2711 | return 0; |
2712 | } | |
2713 | ||
2714 | /* | |
2715 | * Read in the allocation group header (free/alloc section). | |
2716 | */ | |
2717 | int /* error */ | |
2718 | xfs_alloc_read_agf( | |
2719 | struct xfs_mount *mp, /* mount point structure */ | |
2720 | struct xfs_trans *tp, /* transaction pointer */ | |
2721 | xfs_agnumber_t agno, /* allocation group number */ | |
2722 | int flags, /* XFS_ALLOC_FLAG_... */ | |
2723 | struct xfs_buf **bpp) /* buffer for the ag freelist header */ | |
2724 | { | |
2725 | struct xfs_agf *agf; /* ag freelist header */ | |
2726 | struct xfs_perag *pag; /* per allocation group data */ | |
2727 | int error; | |
2728 | ||
d123031a | 2729 | trace_xfs_alloc_read_agf(mp, agno); |
4805621a | 2730 | |
d123031a | 2731 | ASSERT(agno != NULLAGNUMBER); |
4805621a | 2732 | error = xfs_read_agf(mp, tp, agno, |
0cadda1c | 2733 | (flags & XFS_ALLOC_FLAG_TRYLOCK) ? XBF_TRYLOCK : 0, |
4805621a CH |
2734 | bpp); |
2735 | if (error) | |
2736 | return error; | |
2737 | if (!*bpp) | |
2738 | return 0; | |
5a52c2a5 | 2739 | ASSERT(!(*bpp)->b_error); |
4805621a CH |
2740 | |
2741 | agf = XFS_BUF_TO_AGF(*bpp); | |
a862e0fd | 2742 | pag = xfs_perag_get(mp, agno); |
1da177e4 | 2743 | if (!pag->pagf_init) { |
16259e7d | 2744 | pag->pagf_freeblks = be32_to_cpu(agf->agf_freeblks); |
92821e2b | 2745 | pag->pagf_btreeblks = be32_to_cpu(agf->agf_btreeblks); |
16259e7d CH |
2746 | pag->pagf_flcount = be32_to_cpu(agf->agf_flcount); |
2747 | pag->pagf_longest = be32_to_cpu(agf->agf_longest); | |
1da177e4 | 2748 | pag->pagf_levels[XFS_BTNUM_BNOi] = |
16259e7d | 2749 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNOi]); |
1da177e4 | 2750 | pag->pagf_levels[XFS_BTNUM_CNTi] = |
16259e7d | 2751 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi]); |
b8704944 DW |
2752 | pag->pagf_levels[XFS_BTNUM_RMAPi] = |
2753 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAPi]); | |
46eeb521 | 2754 | pag->pagf_refcount_level = be32_to_cpu(agf->agf_refcount_level); |
1da177e4 | 2755 | pag->pagf_init = 1; |
a27ba260 | 2756 | pag->pagf_agflreset = xfs_agfl_needs_reset(mp, agf); |
1da177e4 LT |
2757 | } |
2758 | #ifdef DEBUG | |
2759 | else if (!XFS_FORCED_SHUTDOWN(mp)) { | |
16259e7d | 2760 | ASSERT(pag->pagf_freeblks == be32_to_cpu(agf->agf_freeblks)); |
89b28393 | 2761 | ASSERT(pag->pagf_btreeblks == be32_to_cpu(agf->agf_btreeblks)); |
16259e7d CH |
2762 | ASSERT(pag->pagf_flcount == be32_to_cpu(agf->agf_flcount)); |
2763 | ASSERT(pag->pagf_longest == be32_to_cpu(agf->agf_longest)); | |
1da177e4 | 2764 | ASSERT(pag->pagf_levels[XFS_BTNUM_BNOi] == |
16259e7d | 2765 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNOi])); |
1da177e4 | 2766 | ASSERT(pag->pagf_levels[XFS_BTNUM_CNTi] == |
16259e7d | 2767 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi])); |
1da177e4 LT |
2768 | } |
2769 | #endif | |
a862e0fd | 2770 | xfs_perag_put(pag); |
1da177e4 LT |
2771 | return 0; |
2772 | } | |
2773 | ||
2774 | /* | |
2775 | * Allocate an extent (variable-size). | |
2776 | * Depending on the allocation type, we either look in a single allocation | |
2777 | * group or loop over the allocation groups to find the result. | |
2778 | */ | |
2779 | int /* error */ | |
e04426b9 | 2780 | xfs_alloc_vextent( |
64396ff2 | 2781 | struct xfs_alloc_arg *args) /* allocation argument structure */ |
1da177e4 | 2782 | { |
64396ff2 BF |
2783 | xfs_agblock_t agsize; /* allocation group size */ |
2784 | int error; | |
2785 | int flags; /* XFS_ALLOC_FLAG_... locking flags */ | |
2786 | struct xfs_mount *mp; /* mount structure pointer */ | |
2787 | xfs_agnumber_t sagno; /* starting allocation group number */ | |
2788 | xfs_alloctype_t type; /* input allocation type */ | |
2789 | int bump_rotor = 0; | |
2790 | xfs_agnumber_t rotorstep = xfs_rotorstep; /* inode32 agf stepper */ | |
1da177e4 LT |
2791 | |
2792 | mp = args->mp; | |
2793 | type = args->otype = args->type; | |
2794 | args->agbno = NULLAGBLOCK; | |
2795 | /* | |
2796 | * Just fix this up, for the case where the last a.g. is shorter | |
2797 | * (or there's only one a.g.) and the caller couldn't easily figure | |
2798 | * that out (xfs_bmap_alloc). | |
2799 | */ | |
2800 | agsize = mp->m_sb.sb_agblocks; | |
2801 | if (args->maxlen > agsize) | |
2802 | args->maxlen = agsize; | |
2803 | if (args->alignment == 0) | |
2804 | args->alignment = 1; | |
2805 | ASSERT(XFS_FSB_TO_AGNO(mp, args->fsbno) < mp->m_sb.sb_agcount); | |
2806 | ASSERT(XFS_FSB_TO_AGBNO(mp, args->fsbno) < agsize); | |
2807 | ASSERT(args->minlen <= args->maxlen); | |
2808 | ASSERT(args->minlen <= agsize); | |
2809 | ASSERT(args->mod < args->prod); | |
2810 | if (XFS_FSB_TO_AGNO(mp, args->fsbno) >= mp->m_sb.sb_agcount || | |
2811 | XFS_FSB_TO_AGBNO(mp, args->fsbno) >= agsize || | |
2812 | args->minlen > args->maxlen || args->minlen > agsize || | |
2813 | args->mod >= args->prod) { | |
2814 | args->fsbno = NULLFSBLOCK; | |
0b1b213f | 2815 | trace_xfs_alloc_vextent_badargs(args); |
1da177e4 LT |
2816 | return 0; |
2817 | } | |
1da177e4 LT |
2818 | |
2819 | switch (type) { | |
2820 | case XFS_ALLOCTYPE_THIS_AG: | |
2821 | case XFS_ALLOCTYPE_NEAR_BNO: | |
2822 | case XFS_ALLOCTYPE_THIS_BNO: | |
2823 | /* | |
2824 | * These three force us into a single a.g. | |
2825 | */ | |
2826 | args->agno = XFS_FSB_TO_AGNO(mp, args->fsbno); | |
a862e0fd | 2827 | args->pag = xfs_perag_get(mp, args->agno); |
1da177e4 | 2828 | error = xfs_alloc_fix_freelist(args, 0); |
1da177e4 | 2829 | if (error) { |
0b1b213f | 2830 | trace_xfs_alloc_vextent_nofix(args); |
1da177e4 LT |
2831 | goto error0; |
2832 | } | |
2833 | if (!args->agbp) { | |
0b1b213f | 2834 | trace_xfs_alloc_vextent_noagbp(args); |
1da177e4 LT |
2835 | break; |
2836 | } | |
2837 | args->agbno = XFS_FSB_TO_AGBNO(mp, args->fsbno); | |
2838 | if ((error = xfs_alloc_ag_vextent(args))) | |
2839 | goto error0; | |
1da177e4 LT |
2840 | break; |
2841 | case XFS_ALLOCTYPE_START_BNO: | |
2842 | /* | |
2843 | * Try near allocation first, then anywhere-in-ag after | |
2844 | * the first a.g. fails. | |
2845 | */ | |
292378ed | 2846 | if ((args->datatype & XFS_ALLOC_INITIAL_USER_DATA) && |
1da177e4 LT |
2847 | (mp->m_flags & XFS_MOUNT_32BITINODES)) { |
2848 | args->fsbno = XFS_AGB_TO_FSB(mp, | |
2849 | ((mp->m_agfrotor / rotorstep) % | |
2850 | mp->m_sb.sb_agcount), 0); | |
2851 | bump_rotor = 1; | |
2852 | } | |
2853 | args->agbno = XFS_FSB_TO_AGBNO(mp, args->fsbno); | |
2854 | args->type = XFS_ALLOCTYPE_NEAR_BNO; | |
2855 | /* FALLTHROUGH */ | |
1da177e4 LT |
2856 | case XFS_ALLOCTYPE_FIRST_AG: |
2857 | /* | |
2858 | * Rotate through the allocation groups looking for a winner. | |
2859 | */ | |
8d242e93 | 2860 | if (type == XFS_ALLOCTYPE_FIRST_AG) { |
1da177e4 LT |
2861 | /* |
2862 | * Start with allocation group given by bno. | |
2863 | */ | |
2864 | args->agno = XFS_FSB_TO_AGNO(mp, args->fsbno); | |
2865 | args->type = XFS_ALLOCTYPE_THIS_AG; | |
2866 | sagno = 0; | |
2867 | flags = 0; | |
2868 | } else { | |
1da177e4 LT |
2869 | /* |
2870 | * Start with the given allocation group. | |
2871 | */ | |
2872 | args->agno = sagno = XFS_FSB_TO_AGNO(mp, args->fsbno); | |
2873 | flags = XFS_ALLOC_FLAG_TRYLOCK; | |
2874 | } | |
2875 | /* | |
2876 | * Loop over allocation groups twice; first time with | |
2877 | * trylock set, second time without. | |
2878 | */ | |
1da177e4 | 2879 | for (;;) { |
a862e0fd | 2880 | args->pag = xfs_perag_get(mp, args->agno); |
1da177e4 | 2881 | error = xfs_alloc_fix_freelist(args, flags); |
1da177e4 | 2882 | if (error) { |
0b1b213f | 2883 | trace_xfs_alloc_vextent_nofix(args); |
1da177e4 LT |
2884 | goto error0; |
2885 | } | |
2886 | /* | |
2887 | * If we get a buffer back then the allocation will fly. | |
2888 | */ | |
2889 | if (args->agbp) { | |
2890 | if ((error = xfs_alloc_ag_vextent(args))) | |
2891 | goto error0; | |
2892 | break; | |
2893 | } | |
0b1b213f CH |
2894 | |
2895 | trace_xfs_alloc_vextent_loopfailed(args); | |
2896 | ||
1da177e4 LT |
2897 | /* |
2898 | * Didn't work, figure out the next iteration. | |
2899 | */ | |
2900 | if (args->agno == sagno && | |
2901 | type == XFS_ALLOCTYPE_START_BNO) | |
2902 | args->type = XFS_ALLOCTYPE_THIS_AG; | |
d210a28c YL |
2903 | /* |
2904 | * For the first allocation, we can try any AG to get | |
2905 | * space. However, if we already have allocated a | |
2906 | * block, we don't want to try AGs whose number is below | |
2907 | * sagno. Otherwise, we may end up with out-of-order | |
2908 | * locking of AGF, which might cause deadlock. | |
2909 | */ | |
2910 | if (++(args->agno) == mp->m_sb.sb_agcount) { | |
64396ff2 | 2911 | if (args->tp->t_firstblock != NULLFSBLOCK) |
d210a28c YL |
2912 | args->agno = sagno; |
2913 | else | |
2914 | args->agno = 0; | |
2915 | } | |
1da177e4 LT |
2916 | /* |
2917 | * Reached the starting a.g., must either be done | |
2918 | * or switch to non-trylock mode. | |
2919 | */ | |
2920 | if (args->agno == sagno) { | |
255c5162 | 2921 | if (flags == 0) { |
1da177e4 | 2922 | args->agbno = NULLAGBLOCK; |
0b1b213f | 2923 | trace_xfs_alloc_vextent_allfailed(args); |
1da177e4 LT |
2924 | break; |
2925 | } | |
255c5162 CH |
2926 | |
2927 | flags = 0; | |
2928 | if (type == XFS_ALLOCTYPE_START_BNO) { | |
2929 | args->agbno = XFS_FSB_TO_AGBNO(mp, | |
2930 | args->fsbno); | |
2931 | args->type = XFS_ALLOCTYPE_NEAR_BNO; | |
1da177e4 LT |
2932 | } |
2933 | } | |
a862e0fd | 2934 | xfs_perag_put(args->pag); |
1da177e4 | 2935 | } |
8d242e93 | 2936 | if (bump_rotor) { |
1da177e4 LT |
2937 | if (args->agno == sagno) |
2938 | mp->m_agfrotor = (mp->m_agfrotor + 1) % | |
2939 | (mp->m_sb.sb_agcount * rotorstep); | |
2940 | else | |
2941 | mp->m_agfrotor = (args->agno * rotorstep + 1) % | |
2942 | (mp->m_sb.sb_agcount * rotorstep); | |
2943 | } | |
2944 | break; | |
2945 | default: | |
2946 | ASSERT(0); | |
2947 | /* NOTREACHED */ | |
2948 | } | |
2949 | if (args->agbno == NULLAGBLOCK) | |
2950 | args->fsbno = NULLFSBLOCK; | |
2951 | else { | |
2952 | args->fsbno = XFS_AGB_TO_FSB(mp, args->agno, args->agbno); | |
2953 | #ifdef DEBUG | |
2954 | ASSERT(args->len >= args->minlen); | |
2955 | ASSERT(args->len <= args->maxlen); | |
2956 | ASSERT(args->agbno % args->alignment == 0); | |
2957 | XFS_AG_CHECK_DADDR(mp, XFS_FSB_TO_DADDR(mp, args->fsbno), | |
2958 | args->len); | |
2959 | #endif | |
3fbbbea3 DC |
2960 | |
2961 | /* Zero the extent if we were asked to do so */ | |
292378ed | 2962 | if (args->datatype & XFS_ALLOC_USERDATA_ZERO) { |
3fbbbea3 DC |
2963 | error = xfs_zero_extent(args->ip, args->fsbno, args->len); |
2964 | if (error) | |
2965 | goto error0; | |
2966 | } | |
2967 | ||
1da177e4 | 2968 | } |
a862e0fd | 2969 | xfs_perag_put(args->pag); |
1da177e4 LT |
2970 | return 0; |
2971 | error0: | |
a862e0fd | 2972 | xfs_perag_put(args->pag); |
1da177e4 LT |
2973 | return error; |
2974 | } | |
2975 | ||
4d89e20b DC |
2976 | /* Ensure that the freelist is at full capacity. */ |
2977 | int | |
2978 | xfs_free_extent_fix_freelist( | |
2979 | struct xfs_trans *tp, | |
2980 | xfs_agnumber_t agno, | |
2981 | struct xfs_buf **agbp) | |
1da177e4 | 2982 | { |
4d89e20b DC |
2983 | struct xfs_alloc_arg args; |
2984 | int error; | |
1da177e4 | 2985 | |
4d89e20b | 2986 | memset(&args, 0, sizeof(struct xfs_alloc_arg)); |
1da177e4 LT |
2987 | args.tp = tp; |
2988 | args.mp = tp->t_mountp; | |
4d89e20b | 2989 | args.agno = agno; |
be65b18a DC |
2990 | |
2991 | /* | |
2992 | * validate that the block number is legal - the enables us to detect | |
2993 | * and handle a silent filesystem corruption rather than crashing. | |
2994 | */ | |
be65b18a | 2995 | if (args.agno >= args.mp->m_sb.sb_agcount) |
2451337d | 2996 | return -EFSCORRUPTED; |
be65b18a | 2997 | |
a862e0fd | 2998 | args.pag = xfs_perag_get(args.mp, args.agno); |
be65b18a DC |
2999 | ASSERT(args.pag); |
3000 | ||
3001 | error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING); | |
3002 | if (error) | |
4d89e20b DC |
3003 | goto out; |
3004 | ||
3005 | *agbp = args.agbp; | |
3006 | out: | |
3007 | xfs_perag_put(args.pag); | |
3008 | return error; | |
3009 | } | |
3010 | ||
3011 | /* | |
3012 | * Free an extent. | |
3013 | * Just break up the extent address and hand off to xfs_free_ag_extent | |
3014 | * after fixing up the freelist. | |
3015 | */ | |
66e3237e | 3016 | int |
fcb762f5 | 3017 | __xfs_free_extent( |
66e3237e DW |
3018 | struct xfs_trans *tp, |
3019 | xfs_fsblock_t bno, | |
3020 | xfs_extlen_t len, | |
3021 | const struct xfs_owner_info *oinfo, | |
3022 | enum xfs_ag_resv_type type, | |
3023 | bool skip_discard) | |
4d89e20b | 3024 | { |
66e3237e DW |
3025 | struct xfs_mount *mp = tp->t_mountp; |
3026 | struct xfs_buf *agbp; | |
3027 | xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, bno); | |
3028 | xfs_agblock_t agbno = XFS_FSB_TO_AGBNO(mp, bno); | |
3029 | int error; | |
3030 | unsigned int busy_flags = 0; | |
4d89e20b DC |
3031 | |
3032 | ASSERT(len != 0); | |
0ab32086 | 3033 | ASSERT(type != XFS_AG_RESV_AGFL); |
4d89e20b | 3034 | |
ba9e7802 | 3035 | if (XFS_TEST_ERROR(false, mp, |
9e24cfd0 | 3036 | XFS_ERRTAG_FREE_EXTENT)) |
ba9e7802 DW |
3037 | return -EIO; |
3038 | ||
4d89e20b DC |
3039 | error = xfs_free_extent_fix_freelist(tp, agno, &agbp); |
3040 | if (error) | |
3041 | return error; | |
3042 | ||
3043 | XFS_WANT_CORRUPTED_GOTO(mp, agbno < mp->m_sb.sb_agblocks, err); | |
be65b18a DC |
3044 | |
3045 | /* validate the extent size is legal now we have the agf locked */ | |
4d89e20b DC |
3046 | XFS_WANT_CORRUPTED_GOTO(mp, |
3047 | agbno + len <= be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_length), | |
3048 | err); | |
be65b18a | 3049 | |
3fd129b6 | 3050 | error = xfs_free_ag_extent(tp, agbp, agno, agbno, len, oinfo, type); |
4d89e20b DC |
3051 | if (error) |
3052 | goto err; | |
3053 | ||
fcb762f5 BF |
3054 | if (skip_discard) |
3055 | busy_flags |= XFS_EXTENT_BUSY_SKIP_DISCARD; | |
3056 | xfs_extent_busy_insert(tp, agno, agbno, len, busy_flags); | |
4d89e20b DC |
3057 | return 0; |
3058 | ||
3059 | err: | |
3060 | xfs_trans_brelse(tp, agbp); | |
1da177e4 LT |
3061 | return error; |
3062 | } | |
2d520bfa DW |
3063 | |
3064 | struct xfs_alloc_query_range_info { | |
3065 | xfs_alloc_query_range_fn fn; | |
3066 | void *priv; | |
3067 | }; | |
3068 | ||
3069 | /* Format btree record and pass to our callback. */ | |
3070 | STATIC int | |
3071 | xfs_alloc_query_range_helper( | |
3072 | struct xfs_btree_cur *cur, | |
3073 | union xfs_btree_rec *rec, | |
3074 | void *priv) | |
3075 | { | |
3076 | struct xfs_alloc_query_range_info *query = priv; | |
3077 | struct xfs_alloc_rec_incore irec; | |
3078 | ||
3079 | irec.ar_startblock = be32_to_cpu(rec->alloc.ar_startblock); | |
3080 | irec.ar_blockcount = be32_to_cpu(rec->alloc.ar_blockcount); | |
3081 | return query->fn(cur, &irec, query->priv); | |
3082 | } | |
3083 | ||
3084 | /* Find all free space within a given range of blocks. */ | |
3085 | int | |
3086 | xfs_alloc_query_range( | |
3087 | struct xfs_btree_cur *cur, | |
3088 | struct xfs_alloc_rec_incore *low_rec, | |
3089 | struct xfs_alloc_rec_incore *high_rec, | |
3090 | xfs_alloc_query_range_fn fn, | |
3091 | void *priv) | |
3092 | { | |
3093 | union xfs_btree_irec low_brec; | |
3094 | union xfs_btree_irec high_brec; | |
3095 | struct xfs_alloc_query_range_info query; | |
3096 | ||
3097 | ASSERT(cur->bc_btnum == XFS_BTNUM_BNO); | |
3098 | low_brec.a = *low_rec; | |
3099 | high_brec.a = *high_rec; | |
3100 | query.priv = priv; | |
3101 | query.fn = fn; | |
3102 | return xfs_btree_query_range(cur, &low_brec, &high_brec, | |
3103 | xfs_alloc_query_range_helper, &query); | |
3104 | } | |
e9a2599a DW |
3105 | |
3106 | /* Find all free space records. */ | |
3107 | int | |
3108 | xfs_alloc_query_all( | |
3109 | struct xfs_btree_cur *cur, | |
3110 | xfs_alloc_query_range_fn fn, | |
3111 | void *priv) | |
3112 | { | |
3113 | struct xfs_alloc_query_range_info query; | |
3114 | ||
3115 | ASSERT(cur->bc_btnum == XFS_BTNUM_BNO); | |
3116 | query.priv = priv; | |
3117 | query.fn = fn; | |
3118 | return xfs_btree_query_all(cur, xfs_alloc_query_range_helper, &query); | |
3119 | } | |
21ec5416 | 3120 | |
ce1d802e DW |
3121 | /* Is there a record covering a given extent? */ |
3122 | int | |
3123 | xfs_alloc_has_record( | |
3124 | struct xfs_btree_cur *cur, | |
3125 | xfs_agblock_t bno, | |
3126 | xfs_extlen_t len, | |
3127 | bool *exists) | |
3128 | { | |
3129 | union xfs_btree_irec low; | |
3130 | union xfs_btree_irec high; | |
3131 | ||
3132 | memset(&low, 0, sizeof(low)); | |
3133 | low.a.ar_startblock = bno; | |
3134 | memset(&high, 0xFF, sizeof(high)); | |
3135 | high.a.ar_startblock = bno + len - 1; | |
3136 | ||
3137 | return xfs_btree_has_record(cur, &low, &high, exists); | |
3138 | } | |
9f3a080e DW |
3139 | |
3140 | /* | |
3141 | * Walk all the blocks in the AGFL. The @walk_fn can return any negative | |
3142 | * error code or XFS_BTREE_QUERY_RANGE_ABORT. | |
3143 | */ | |
3144 | int | |
3145 | xfs_agfl_walk( | |
3146 | struct xfs_mount *mp, | |
3147 | struct xfs_agf *agf, | |
3148 | struct xfs_buf *agflbp, | |
3149 | xfs_agfl_walk_fn walk_fn, | |
3150 | void *priv) | |
3151 | { | |
3152 | __be32 *agfl_bno; | |
3153 | unsigned int i; | |
3154 | int error; | |
3155 | ||
3156 | agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp); | |
3157 | i = be32_to_cpu(agf->agf_flfirst); | |
3158 | ||
3159 | /* Nothing to walk in an empty AGFL. */ | |
3160 | if (agf->agf_flcount == cpu_to_be32(0)) | |
3161 | return 0; | |
3162 | ||
3163 | /* Otherwise, walk from first to last, wrapping as needed. */ | |
3164 | for (;;) { | |
3165 | error = walk_fn(mp, be32_to_cpu(agfl_bno[i]), priv); | |
3166 | if (error) | |
3167 | return error; | |
3168 | if (i == be32_to_cpu(agf->agf_fllast)) | |
3169 | break; | |
3170 | if (++i == xfs_agfl_size(mp)) | |
3171 | i = 0; | |
3172 | } | |
3173 | ||
3174 | return 0; | |
3175 | } |