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37b3b4d6 | 1 | // SPDX-License-Identifier: GPL-2.0 |
2bd0ea18 | 2 | /* |
5e656dbb | 3 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
da23017d | 4 | * All Rights Reserved. |
2bd0ea18 | 5 | */ |
9c799827 | 6 | #include "libxfs_priv.h" |
b626fb59 DC |
7 | #include "xfs_fs.h" |
8 | #include "xfs_format.h" | |
9 | #include "xfs_log_format.h" | |
10 | #include "xfs_shared.h" | |
11 | #include "xfs_trans_resv.h" | |
12 | #include "xfs_bit.h" | |
13 | #include "xfs_sb.h" | |
14 | #include "xfs_mount.h" | |
f944d3d0 | 15 | #include "xfs_defer.h" |
b626fb59 | 16 | #include "xfs_btree.h" |
631ac87a | 17 | #include "xfs_rmap.h" |
b626fb59 DC |
18 | #include "xfs_alloc_btree.h" |
19 | #include "xfs_alloc.h" | |
2cf10e4c | 20 | #include "xfs_errortag.h" |
b626fb59 DC |
21 | #include "xfs_trace.h" |
22 | #include "xfs_trans.h" | |
cf8ce220 | 23 | #include "xfs_ag_resv.h" |
d5c1b462 BF |
24 | #include "xfs_bmap.h" |
25 | ||
26 | extern kmem_zone_t *xfs_bmap_free_item_zone; | |
2bd0ea18 | 27 | |
ff105f75 DC |
28 | struct workqueue_struct *xfs_alloc_wq; |
29 | ||
2bd0ea18 | 30 | #define XFS_ABSDIFF(a,b) (((a) <= (b)) ? ((b) - (a)) : ((a) - (b))) |
5e656dbb BN |
31 | |
32 | #define XFSA_FIXUP_BNO_OK 1 | |
33 | #define XFSA_FIXUP_CNT_OK 2 | |
34 | ||
5e656dbb BN |
35 | STATIC int xfs_alloc_ag_vextent_exact(xfs_alloc_arg_t *); |
36 | STATIC int xfs_alloc_ag_vextent_near(xfs_alloc_arg_t *); | |
37 | STATIC int xfs_alloc_ag_vextent_size(xfs_alloc_arg_t *); | |
2bd0ea18 | 38 | |
b8165508 DC |
39 | /* |
40 | * Size of the AGFL. For CRC-enabled filesystes we steal a couple of slots in | |
41 | * the beginning of the block for a proper header with the location information | |
42 | * and CRC. | |
43 | */ | |
44 | unsigned int | |
45 | xfs_agfl_size( | |
46 | struct xfs_mount *mp) | |
47 | { | |
48 | unsigned int size = mp->m_sb.sb_sectsize; | |
49 | ||
50 | if (xfs_sb_version_hascrc(&mp->m_sb)) | |
51 | size -= sizeof(struct xfs_agfl); | |
52 | ||
53 | return size / sizeof(xfs_agblock_t); | |
54 | } | |
55 | ||
2a96beb9 DW |
56 | unsigned int |
57 | xfs_refc_block( | |
58 | struct xfs_mount *mp) | |
59 | { | |
60 | if (xfs_sb_version_hasrmapbt(&mp->m_sb)) | |
61 | return XFS_RMAP_BLOCK(mp) + 1; | |
62 | if (xfs_sb_version_hasfinobt(&mp->m_sb)) | |
63 | return XFS_FIBT_BLOCK(mp) + 1; | |
64 | return XFS_IBT_BLOCK(mp) + 1; | |
65 | } | |
66 | ||
ef5340cd DW |
67 | xfs_extlen_t |
68 | xfs_prealloc_blocks( | |
69 | struct xfs_mount *mp) | |
70 | { | |
2a96beb9 DW |
71 | if (xfs_sb_version_hasreflink(&mp->m_sb)) |
72 | return xfs_refc_block(mp) + 1; | |
ef5340cd DW |
73 | if (xfs_sb_version_hasrmapbt(&mp->m_sb)) |
74 | return XFS_RMAP_BLOCK(mp) + 1; | |
75 | if (xfs_sb_version_hasfinobt(&mp->m_sb)) | |
76 | return XFS_FIBT_BLOCK(mp) + 1; | |
77 | return XFS_IBT_BLOCK(mp) + 1; | |
78 | } | |
79 | ||
b8a8d6e5 DW |
80 | /* |
81 | * In order to avoid ENOSPC-related deadlock caused by out-of-order locking of | |
82 | * AGF buffer (PV 947395), we place constraints on the relationship among | |
83 | * actual allocations for data blocks, freelist blocks, and potential file data | |
84 | * bmap btree blocks. However, these restrictions may result in no actual space | |
85 | * allocated for a delayed extent, for example, a data block in a certain AG is | |
86 | * allocated but there is no additional block for the additional bmap btree | |
87 | * block due to a split of the bmap btree of the file. The result of this may | |
88 | * lead to an infinite loop when the file gets flushed to disk and all delayed | |
89 | * extents need to be actually allocated. To get around this, we explicitly set | |
90 | * aside a few blocks which will not be reserved in delayed allocation. | |
91 | * | |
cf8ce220 DW |
92 | * We need to reserve 4 fsbs _per AG_ for the freelist and 4 more to handle a |
93 | * potential split of the file's bmap btree. | |
b8a8d6e5 DW |
94 | */ |
95 | unsigned int | |
96 | xfs_alloc_set_aside( | |
97 | struct xfs_mount *mp) | |
98 | { | |
8eeb15ea | 99 | return mp->m_sb.sb_agcount * (XFS_ALLOC_AGFL_RESERVE + 4); |
b8a8d6e5 DW |
100 | } |
101 | ||
102 | /* | |
103 | * When deciding how much space to allocate out of an AG, we limit the | |
104 | * allocation maximum size to the size the AG. However, we cannot use all the | |
105 | * blocks in the AG - some are permanently used by metadata. These | |
106 | * blocks are generally: | |
107 | * - the AG superblock, AGF, AGI and AGFL | |
108 | * - the AGF (bno and cnt) and AGI btree root blocks, and optionally | |
109 | * the AGI free inode and rmap btree root blocks. | |
110 | * - blocks on the AGFL according to xfs_alloc_set_aside() limits | |
111 | * - the rmapbt root block | |
112 | * | |
113 | * The AG headers are sector sized, so the amount of space they take up is | |
114 | * dependent on filesystem geometry. The others are all single blocks. | |
115 | */ | |
116 | unsigned int | |
117 | xfs_alloc_ag_max_usable( | |
118 | struct xfs_mount *mp) | |
119 | { | |
120 | unsigned int blocks; | |
121 | ||
122 | blocks = XFS_BB_TO_FSB(mp, XFS_FSS_TO_BB(mp, 4)); /* ag headers */ | |
123 | blocks += XFS_ALLOC_AGFL_RESERVE; | |
124 | blocks += 3; /* AGF, AGI btree root blocks */ | |
125 | if (xfs_sb_version_hasfinobt(&mp->m_sb)) | |
126 | blocks++; /* finobt root block */ | |
127 | if (xfs_sb_version_hasrmapbt(&mp->m_sb)) | |
128 | blocks++; /* rmap root block */ | |
868c70e3 DW |
129 | if (xfs_sb_version_hasreflink(&mp->m_sb)) |
130 | blocks++; /* refcount root block */ | |
b8a8d6e5 DW |
131 | |
132 | return mp->m_sb.sb_agblocks - blocks; | |
133 | } | |
134 | ||
b194c7d8 BN |
135 | /* |
136 | * Lookup the record equal to [bno, len] in the btree given by cur. | |
137 | */ | |
138 | STATIC int /* error */ | |
139 | xfs_alloc_lookup_eq( | |
140 | struct xfs_btree_cur *cur, /* btree cursor */ | |
141 | xfs_agblock_t bno, /* starting block of extent */ | |
142 | xfs_extlen_t len, /* length of extent */ | |
143 | int *stat) /* success/failure */ | |
144 | { | |
7777d8c6 BF |
145 | int error; |
146 | ||
b194c7d8 BN |
147 | cur->bc_rec.a.ar_startblock = bno; |
148 | cur->bc_rec.a.ar_blockcount = len; | |
7777d8c6 BF |
149 | error = xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat); |
150 | cur->bc_private.a.priv.abt.active = (*stat == 1); | |
151 | return error; | |
b194c7d8 BN |
152 | } |
153 | ||
154 | /* | |
155 | * Lookup the first record greater than or equal to [bno, len] | |
156 | * in the btree given by cur. | |
157 | */ | |
a2ceac1f | 158 | int /* error */ |
b194c7d8 BN |
159 | xfs_alloc_lookup_ge( |
160 | struct xfs_btree_cur *cur, /* btree cursor */ | |
161 | xfs_agblock_t bno, /* starting block of extent */ | |
162 | xfs_extlen_t len, /* length of extent */ | |
163 | int *stat) /* success/failure */ | |
164 | { | |
7777d8c6 BF |
165 | int error; |
166 | ||
b194c7d8 BN |
167 | cur->bc_rec.a.ar_startblock = bno; |
168 | cur->bc_rec.a.ar_blockcount = len; | |
7777d8c6 BF |
169 | error = xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat); |
170 | cur->bc_private.a.priv.abt.active = (*stat == 1); | |
171 | return error; | |
b194c7d8 BN |
172 | } |
173 | ||
174 | /* | |
175 | * Lookup the first record less than or equal to [bno, len] | |
176 | * in the btree given by cur. | |
177 | */ | |
1fe41a73 | 178 | int /* error */ |
b194c7d8 BN |
179 | xfs_alloc_lookup_le( |
180 | struct xfs_btree_cur *cur, /* btree cursor */ | |
181 | xfs_agblock_t bno, /* starting block of extent */ | |
182 | xfs_extlen_t len, /* length of extent */ | |
183 | int *stat) /* success/failure */ | |
184 | { | |
7777d8c6 | 185 | int error; |
b194c7d8 BN |
186 | cur->bc_rec.a.ar_startblock = bno; |
187 | cur->bc_rec.a.ar_blockcount = len; | |
7777d8c6 BF |
188 | error = xfs_btree_lookup(cur, XFS_LOOKUP_LE, stat); |
189 | cur->bc_private.a.priv.abt.active = (*stat == 1); | |
190 | return error; | |
191 | } | |
192 | ||
193 | static inline bool | |
194 | xfs_alloc_cur_active( | |
195 | struct xfs_btree_cur *cur) | |
196 | { | |
197 | return cur && cur->bc_private.a.priv.abt.active; | |
b194c7d8 BN |
198 | } |
199 | ||
200 | /* | |
201 | * Update the record referred to by cur to the value given | |
202 | * by [bno, len]. | |
203 | * This either works (return 0) or gets an EFSCORRUPTED error. | |
204 | */ | |
205 | STATIC int /* error */ | |
206 | xfs_alloc_update( | |
207 | struct xfs_btree_cur *cur, /* btree cursor */ | |
208 | xfs_agblock_t bno, /* starting block of extent */ | |
209 | xfs_extlen_t len) /* length of extent */ | |
210 | { | |
211 | union xfs_btree_rec rec; | |
212 | ||
213 | rec.alloc.ar_startblock = cpu_to_be32(bno); | |
214 | rec.alloc.ar_blockcount = cpu_to_be32(len); | |
215 | return xfs_btree_update(cur, &rec); | |
216 | } | |
217 | ||
218 | /* | |
219 | * Get the data from the pointed-to record. | |
220 | */ | |
a2ceac1f | 221 | int /* error */ |
b194c7d8 BN |
222 | xfs_alloc_get_rec( |
223 | struct xfs_btree_cur *cur, /* btree cursor */ | |
224 | xfs_agblock_t *bno, /* output: starting block of extent */ | |
225 | xfs_extlen_t *len, /* output: length of extent */ | |
226 | int *stat) /* output: success/failure */ | |
227 | { | |
ec291989 DC |
228 | struct xfs_mount *mp = cur->bc_mp; |
229 | xfs_agnumber_t agno = cur->bc_private.a.agno; | |
b194c7d8 BN |
230 | union xfs_btree_rec *rec; |
231 | int error; | |
232 | ||
233 | error = xfs_btree_get_rec(cur, &rec, stat); | |
3741f971 DW |
234 | if (error || !(*stat)) |
235 | return error; | |
3741f971 DW |
236 | |
237 | *bno = be32_to_cpu(rec->alloc.ar_startblock); | |
238 | *len = be32_to_cpu(rec->alloc.ar_blockcount); | |
239 | ||
c25e4305 CM |
240 | if (*len == 0) |
241 | goto out_bad_rec; | |
242 | ||
ec291989 DC |
243 | /* check for valid extent range, including overflow */ |
244 | if (!xfs_verify_agbno(mp, agno, *bno)) | |
245 | goto out_bad_rec; | |
246 | if (*bno > *bno + *len) | |
247 | goto out_bad_rec; | |
248 | if (!xfs_verify_agbno(mp, agno, *bno + *len - 1)) | |
249 | goto out_bad_rec; | |
250 | ||
251 | return 0; | |
252 | ||
253 | out_bad_rec: | |
254 | xfs_warn(mp, | |
255 | "%s Freespace BTree record corruption in AG %d detected!", | |
256 | cur->bc_btnum == XFS_BTNUM_BNO ? "Block" : "Size", agno); | |
257 | xfs_warn(mp, | |
258 | "start block 0x%x block count 0x%x", *bno, *len); | |
259 | return -EFSCORRUPTED; | |
b194c7d8 BN |
260 | } |
261 | ||
2bd0ea18 NS |
262 | /* |
263 | * Compute aligned version of the found extent. | |
264 | * Takes alignment and min length into account. | |
265 | */ | |
cd80de04 | 266 | STATIC bool |
2bd0ea18 | 267 | xfs_alloc_compute_aligned( |
a2ceac1f | 268 | xfs_alloc_arg_t *args, /* allocation argument structure */ |
2bd0ea18 NS |
269 | xfs_agblock_t foundbno, /* starting block in found extent */ |
270 | xfs_extlen_t foundlen, /* length in found extent */ | |
2bd0ea18 | 271 | xfs_agblock_t *resbno, /* result block number */ |
cd80de04 CH |
272 | xfs_extlen_t *reslen, /* result length */ |
273 | unsigned *busy_gen) | |
2bd0ea18 | 274 | { |
cd80de04 CH |
275 | xfs_agblock_t bno = foundbno; |
276 | xfs_extlen_t len = foundlen; | |
ff3263dd | 277 | xfs_extlen_t diff; |
cd80de04 | 278 | bool busy; |
2bd0ea18 | 279 | |
a2ceac1f | 280 | /* Trim busy sections out of found extent */ |
cd80de04 | 281 | busy = xfs_extent_busy_trim(args, &bno, &len, busy_gen); |
a2ceac1f | 282 | |
ff3263dd BF |
283 | /* |
284 | * If we have a largish extent that happens to start before min_agbno, | |
285 | * see if we can shift it into range... | |
286 | */ | |
287 | if (bno < args->min_agbno && bno + len > args->min_agbno) { | |
288 | diff = args->min_agbno - bno; | |
289 | if (len > diff) { | |
290 | bno += diff; | |
291 | len -= diff; | |
292 | } | |
293 | } | |
294 | ||
a2ceac1f DC |
295 | if (args->alignment > 1 && len >= args->minlen) { |
296 | xfs_agblock_t aligned_bno = roundup(bno, args->alignment); | |
ff3263dd BF |
297 | |
298 | diff = aligned_bno - bno; | |
a2ceac1f DC |
299 | |
300 | *resbno = aligned_bno; | |
301 | *reslen = diff >= len ? 0 : len - diff; | |
2bd0ea18 | 302 | } else { |
a2ceac1f DC |
303 | *resbno = bno; |
304 | *reslen = len; | |
2bd0ea18 | 305 | } |
cd80de04 CH |
306 | |
307 | return busy; | |
2bd0ea18 NS |
308 | } |
309 | ||
310 | /* | |
311 | * Compute best start block and diff for "near" allocations. | |
312 | * freelen >= wantlen already checked by caller. | |
313 | */ | |
314 | STATIC xfs_extlen_t /* difference value (absolute) */ | |
315 | xfs_alloc_compute_diff( | |
316 | xfs_agblock_t wantbno, /* target starting block */ | |
317 | xfs_extlen_t wantlen, /* target length */ | |
318 | xfs_extlen_t alignment, /* target alignment */ | |
1fccd5c8 | 319 | int datatype, /* are we allocating data? */ |
2bd0ea18 NS |
320 | xfs_agblock_t freebno, /* freespace's starting block */ |
321 | xfs_extlen_t freelen, /* freespace's length */ | |
322 | xfs_agblock_t *newbnop) /* result: best start block from free */ | |
323 | { | |
324 | xfs_agblock_t freeend; /* end of freespace extent */ | |
325 | xfs_agblock_t newbno1; /* return block number */ | |
326 | xfs_agblock_t newbno2; /* other new block number */ | |
0e266570 NS |
327 | xfs_extlen_t newlen1=0; /* length with newbno1 */ |
328 | xfs_extlen_t newlen2=0; /* length with newbno2 */ | |
2bd0ea18 | 329 | xfs_agblock_t wantend; /* end of target extent */ |
a85522b6 | 330 | bool userdata = datatype & XFS_ALLOC_USERDATA; |
2bd0ea18 NS |
331 | |
332 | ASSERT(freelen >= wantlen); | |
333 | freeend = freebno + freelen; | |
334 | wantend = wantbno + wantlen; | |
84a62eea DC |
335 | /* |
336 | * We want to allocate from the start of a free extent if it is past | |
337 | * the desired block or if we are allocating user data and the free | |
338 | * extent is before desired block. The second case is there to allow | |
339 | * for contiguous allocation from the remaining free space if the file | |
340 | * grows in the short term. | |
341 | */ | |
342 | if (freebno >= wantbno || (userdata && freeend < wantend)) { | |
2bd0ea18 NS |
343 | if ((newbno1 = roundup(freebno, alignment)) >= freeend) |
344 | newbno1 = NULLAGBLOCK; | |
345 | } else if (freeend >= wantend && alignment > 1) { | |
346 | newbno1 = roundup(wantbno, alignment); | |
347 | newbno2 = newbno1 - alignment; | |
348 | if (newbno1 >= freeend) | |
349 | newbno1 = NULLAGBLOCK; | |
350 | else | |
351 | newlen1 = XFS_EXTLEN_MIN(wantlen, freeend - newbno1); | |
352 | if (newbno2 < freebno) | |
353 | newbno2 = NULLAGBLOCK; | |
354 | else | |
355 | newlen2 = XFS_EXTLEN_MIN(wantlen, freeend - newbno2); | |
356 | if (newbno1 != NULLAGBLOCK && newbno2 != NULLAGBLOCK) { | |
357 | if (newlen1 < newlen2 || | |
358 | (newlen1 == newlen2 && | |
359 | XFS_ABSDIFF(newbno1, wantbno) > | |
360 | XFS_ABSDIFF(newbno2, wantbno))) | |
361 | newbno1 = newbno2; | |
362 | } else if (newbno2 != NULLAGBLOCK) | |
363 | newbno1 = newbno2; | |
364 | } else if (freeend >= wantend) { | |
365 | newbno1 = wantbno; | |
366 | } else if (alignment > 1) { | |
367 | newbno1 = roundup(freeend - wantlen, alignment); | |
368 | if (newbno1 > freeend - wantlen && | |
369 | newbno1 - alignment >= freebno) | |
370 | newbno1 -= alignment; | |
371 | else if (newbno1 >= freeend) | |
372 | newbno1 = NULLAGBLOCK; | |
373 | } else | |
374 | newbno1 = freeend - wantlen; | |
375 | *newbnop = newbno1; | |
376 | return newbno1 == NULLAGBLOCK ? 0 : XFS_ABSDIFF(newbno1, wantbno); | |
377 | } | |
378 | ||
379 | /* | |
380 | * Fix up the length, based on mod and prod. | |
381 | * len should be k * prod + mod for some k. | |
382 | * If len is too small it is returned unchanged. | |
383 | * If len hits maxlen it is left alone. | |
384 | */ | |
385 | STATIC void | |
386 | xfs_alloc_fix_len( | |
dfc130f3 | 387 | xfs_alloc_arg_t *args) /* allocation argument structure */ |
2bd0ea18 NS |
388 | { |
389 | xfs_extlen_t k; | |
390 | xfs_extlen_t rlen; | |
391 | ||
392 | ASSERT(args->mod < args->prod); | |
393 | rlen = args->len; | |
394 | ASSERT(rlen >= args->minlen); | |
395 | ASSERT(rlen <= args->maxlen); | |
396 | if (args->prod <= 1 || rlen < args->mod || rlen == args->maxlen || | |
397 | (args->mod == 0 && rlen < args->prod)) | |
398 | return; | |
399 | k = rlen % args->prod; | |
400 | if (k == args->mod) | |
401 | return; | |
ff105f75 DC |
402 | if (k > args->mod) |
403 | rlen = rlen - (k - args->mod); | |
404 | else | |
405 | rlen = rlen - args->prod + (args->mod - k); | |
19ebedcf | 406 | /* casts to (int) catch length underflows */ |
ff105f75 DC |
407 | if ((int)rlen < (int)args->minlen) |
408 | return; | |
409 | ASSERT(rlen >= args->minlen && rlen <= args->maxlen); | |
410 | ASSERT(rlen % args->prod == args->mod); | |
2c003dc2 CH |
411 | ASSERT(args->pag->pagf_freeblks + args->pag->pagf_flcount >= |
412 | rlen + args->minleft); | |
2bd0ea18 NS |
413 | args->len = rlen; |
414 | } | |
415 | ||
2bd0ea18 NS |
416 | /* |
417 | * Update the two btrees, logically removing from freespace the extent | |
418 | * starting at rbno, rlen blocks. The extent is contained within the | |
419 | * actual (current) free extent fbno for flen blocks. | |
420 | * Flags are passed in indicating whether the cursors are set to the | |
421 | * relevant records. | |
422 | */ | |
423 | STATIC int /* error code */ | |
424 | xfs_alloc_fixup_trees( | |
dfc130f3 RC |
425 | xfs_btree_cur_t *cnt_cur, /* cursor for by-size btree */ |
426 | xfs_btree_cur_t *bno_cur, /* cursor for by-block btree */ | |
2bd0ea18 NS |
427 | xfs_agblock_t fbno, /* starting block of free extent */ |
428 | xfs_extlen_t flen, /* length of free extent */ | |
429 | xfs_agblock_t rbno, /* starting block of returned extent */ | |
430 | xfs_extlen_t rlen, /* length of returned extent */ | |
431 | int flags) /* flags, XFSA_FIXUP_... */ | |
432 | { | |
433 | int error; /* error code */ | |
434 | int i; /* operation results */ | |
435 | xfs_agblock_t nfbno1; /* first new free startblock */ | |
436 | xfs_agblock_t nfbno2; /* second new free startblock */ | |
0e266570 NS |
437 | xfs_extlen_t nflen1=0; /* first new free length */ |
438 | xfs_extlen_t nflen2=0; /* second new free length */ | |
19ebedcf DC |
439 | struct xfs_mount *mp; |
440 | ||
441 | mp = cnt_cur->bc_mp; | |
2bd0ea18 NS |
442 | |
443 | /* | |
444 | * Look up the record in the by-size tree if necessary. | |
445 | */ | |
446 | if (flags & XFSA_FIXUP_CNT_OK) { | |
447 | #ifdef DEBUG | |
0e266570 | 448 | if ((error = xfs_alloc_get_rec(cnt_cur, &nfbno1, &nflen1, &i))) |
2bd0ea18 | 449 | return error; |
fbb4fa7f DW |
450 | if (XFS_IS_CORRUPT(mp, |
451 | i != 1 || | |
452 | nfbno1 != fbno || | |
453 | nflen1 != flen)) | |
454 | return -EFSCORRUPTED; | |
2bd0ea18 NS |
455 | #endif |
456 | } else { | |
0e266570 | 457 | if ((error = xfs_alloc_lookup_eq(cnt_cur, fbno, flen, &i))) |
2bd0ea18 | 458 | return error; |
fbb4fa7f DW |
459 | if (XFS_IS_CORRUPT(mp, i != 1)) |
460 | return -EFSCORRUPTED; | |
2bd0ea18 NS |
461 | } |
462 | /* | |
463 | * Look up the record in the by-block tree if necessary. | |
464 | */ | |
465 | if (flags & XFSA_FIXUP_BNO_OK) { | |
466 | #ifdef DEBUG | |
0e266570 | 467 | if ((error = xfs_alloc_get_rec(bno_cur, &nfbno1, &nflen1, &i))) |
2bd0ea18 | 468 | return error; |
fbb4fa7f DW |
469 | if (XFS_IS_CORRUPT(mp, |
470 | i != 1 || | |
471 | nfbno1 != fbno || | |
472 | nflen1 != flen)) | |
473 | return -EFSCORRUPTED; | |
2bd0ea18 NS |
474 | #endif |
475 | } else { | |
0e266570 | 476 | if ((error = xfs_alloc_lookup_eq(bno_cur, fbno, flen, &i))) |
2bd0ea18 | 477 | return error; |
fbb4fa7f DW |
478 | if (XFS_IS_CORRUPT(mp, i != 1)) |
479 | return -EFSCORRUPTED; | |
2bd0ea18 | 480 | } |
b3563c19 | 481 | |
2bd0ea18 | 482 | #ifdef DEBUG |
b3563c19 BN |
483 | if (bno_cur->bc_nlevels == 1 && cnt_cur->bc_nlevels == 1) { |
484 | struct xfs_btree_block *bnoblock; | |
485 | struct xfs_btree_block *cntblock; | |
486 | ||
487 | bnoblock = XFS_BUF_TO_BLOCK(bno_cur->bc_bufs[0]); | |
488 | cntblock = XFS_BUF_TO_BLOCK(cnt_cur->bc_bufs[0]); | |
2bd0ea18 | 489 | |
fbb4fa7f DW |
490 | if (XFS_IS_CORRUPT(mp, |
491 | bnoblock->bb_numrecs != | |
492 | cntblock->bb_numrecs)) | |
493 | return -EFSCORRUPTED; | |
2bd0ea18 NS |
494 | } |
495 | #endif | |
b3563c19 | 496 | |
2bd0ea18 NS |
497 | /* |
498 | * Deal with all four cases: the allocated record is contained | |
499 | * within the freespace record, so we can have new freespace | |
500 | * at either (or both) end, or no freespace remaining. | |
501 | */ | |
502 | if (rbno == fbno && rlen == flen) | |
503 | nfbno1 = nfbno2 = NULLAGBLOCK; | |
504 | else if (rbno == fbno) { | |
505 | nfbno1 = rbno + rlen; | |
506 | nflen1 = flen - rlen; | |
507 | nfbno2 = NULLAGBLOCK; | |
508 | } else if (rbno + rlen == fbno + flen) { | |
509 | nfbno1 = fbno; | |
510 | nflen1 = flen - rlen; | |
511 | nfbno2 = NULLAGBLOCK; | |
512 | } else { | |
513 | nfbno1 = fbno; | |
514 | nflen1 = rbno - fbno; | |
515 | nfbno2 = rbno + rlen; | |
516 | nflen2 = (fbno + flen) - nfbno2; | |
517 | } | |
518 | /* | |
519 | * Delete the entry from the by-size btree. | |
520 | */ | |
b194c7d8 | 521 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
2bd0ea18 | 522 | return error; |
fbb4fa7f DW |
523 | if (XFS_IS_CORRUPT(mp, i != 1)) |
524 | return -EFSCORRUPTED; | |
2bd0ea18 NS |
525 | /* |
526 | * Add new by-size btree entry(s). | |
527 | */ | |
528 | if (nfbno1 != NULLAGBLOCK) { | |
0e266570 | 529 | if ((error = xfs_alloc_lookup_eq(cnt_cur, nfbno1, nflen1, &i))) |
2bd0ea18 | 530 | return error; |
fbb4fa7f DW |
531 | if (XFS_IS_CORRUPT(mp, i != 0)) |
532 | return -EFSCORRUPTED; | |
b194c7d8 | 533 | if ((error = xfs_btree_insert(cnt_cur, &i))) |
2bd0ea18 | 534 | return error; |
fbb4fa7f DW |
535 | if (XFS_IS_CORRUPT(mp, i != 1)) |
536 | return -EFSCORRUPTED; | |
2bd0ea18 NS |
537 | } |
538 | if (nfbno2 != NULLAGBLOCK) { | |
0e266570 | 539 | if ((error = xfs_alloc_lookup_eq(cnt_cur, nfbno2, nflen2, &i))) |
2bd0ea18 | 540 | return error; |
fbb4fa7f DW |
541 | if (XFS_IS_CORRUPT(mp, i != 0)) |
542 | return -EFSCORRUPTED; | |
b194c7d8 | 543 | if ((error = xfs_btree_insert(cnt_cur, &i))) |
2bd0ea18 | 544 | return error; |
fbb4fa7f DW |
545 | if (XFS_IS_CORRUPT(mp, i != 1)) |
546 | return -EFSCORRUPTED; | |
2bd0ea18 NS |
547 | } |
548 | /* | |
549 | * Fix up the by-block btree entry(s). | |
550 | */ | |
551 | if (nfbno1 == NULLAGBLOCK) { | |
552 | /* | |
553 | * No remaining freespace, just delete the by-block tree entry. | |
554 | */ | |
b194c7d8 | 555 | if ((error = xfs_btree_delete(bno_cur, &i))) |
2bd0ea18 | 556 | return error; |
fbb4fa7f DW |
557 | if (XFS_IS_CORRUPT(mp, i != 1)) |
558 | return -EFSCORRUPTED; | |
2bd0ea18 NS |
559 | } else { |
560 | /* | |
561 | * Update the by-block entry to start later|be shorter. | |
562 | */ | |
0e266570 | 563 | if ((error = xfs_alloc_update(bno_cur, nfbno1, nflen1))) |
2bd0ea18 NS |
564 | return error; |
565 | } | |
566 | if (nfbno2 != NULLAGBLOCK) { | |
567 | /* | |
568 | * 2 resulting free entries, need to add one. | |
569 | */ | |
0e266570 | 570 | if ((error = xfs_alloc_lookup_eq(bno_cur, nfbno2, nflen2, &i))) |
2bd0ea18 | 571 | return error; |
fbb4fa7f DW |
572 | if (XFS_IS_CORRUPT(mp, i != 0)) |
573 | return -EFSCORRUPTED; | |
b194c7d8 | 574 | if ((error = xfs_btree_insert(bno_cur, &i))) |
2bd0ea18 | 575 | return error; |
fbb4fa7f DW |
576 | if (XFS_IS_CORRUPT(mp, i != 1)) |
577 | return -EFSCORRUPTED; | |
2bd0ea18 NS |
578 | } |
579 | return 0; | |
580 | } | |
581 | ||
bc01119d | 582 | static xfs_failaddr_t |
a2ceac1f DC |
583 | xfs_agfl_verify( |
584 | struct xfs_buf *bp) | |
585 | { | |
7861ef77 | 586 | struct xfs_mount *mp = bp->b_mount; |
a2ceac1f | 587 | struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp); |
a2ceac1f DC |
588 | int i; |
589 | ||
95d9582b DW |
590 | /* |
591 | * There is no verification of non-crc AGFLs because mkfs does not | |
592 | * initialise the AGFL to zero or NULL. Hence the only valid part of the | |
593 | * AGFL is what the AGF says is active. We can't get to the AGF, so we | |
594 | * can't verify just those entries are valid. | |
595 | */ | |
596 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
597 | return NULL; | |
598 | ||
68dbe77f | 599 | if (!xfs_verify_magic(bp, agfl->agfl_magicnum)) |
bc01119d | 600 | return __this_address; |
68dbe77f | 601 | if (!uuid_equal(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid)) |
bc01119d | 602 | return __this_address; |
dd5b876e DC |
603 | /* |
604 | * during growfs operations, the perag is not fully initialised, | |
605 | * so we can't use it for any useful checking. growfs ensures we can't | |
606 | * use it by using uncached buffers that don't have the perag attached | |
607 | * so we can detect and avoid this problem. | |
608 | */ | |
609 | if (bp->b_pag && be32_to_cpu(agfl->agfl_seqno) != bp->b_pag->pag_agno) | |
bc01119d | 610 | return __this_address; |
dd5b876e | 611 | |
b8165508 | 612 | for (i = 0; i < xfs_agfl_size(mp); i++) { |
dd5b876e | 613 | if (be32_to_cpu(agfl->agfl_bno[i]) != NULLAGBLOCK && |
a2ceac1f | 614 | be32_to_cpu(agfl->agfl_bno[i]) >= mp->m_sb.sb_agblocks) |
bc01119d | 615 | return __this_address; |
a2ceac1f | 616 | } |
a65d8d29 | 617 | |
bc01119d DW |
618 | if (!xfs_log_check_lsn(mp, be64_to_cpu(XFS_BUF_TO_AGFL(bp)->agfl_lsn))) |
619 | return __this_address; | |
620 | return NULL; | |
dd5b876e DC |
621 | } |
622 | ||
623 | static void | |
624 | xfs_agfl_read_verify( | |
625 | struct xfs_buf *bp) | |
626 | { | |
7861ef77 | 627 | struct xfs_mount *mp = bp->b_mount; |
1e697959 | 628 | xfs_failaddr_t fa; |
dd5b876e DC |
629 | |
630 | /* | |
631 | * There is no verification of non-crc AGFLs because mkfs does not | |
632 | * initialise the AGFL to zero or NULL. Hence the only valid part of the | |
633 | * AGFL is what the AGF says is active. We can't get to the AGF, so we | |
634 | * can't verify just those entries are valid. | |
635 | */ | |
636 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
637 | return; | |
638 | ||
45922933 | 639 | if (!xfs_buf_verify_cksum(bp, XFS_AGFL_CRC_OFF)) |
1e697959 DW |
640 | xfs_verifier_error(bp, -EFSBADCRC, __this_address); |
641 | else { | |
642 | fa = xfs_agfl_verify(bp); | |
643 | if (fa) | |
644 | xfs_verifier_error(bp, -EFSCORRUPTED, fa); | |
645 | } | |
a2ceac1f DC |
646 | } |
647 | ||
648 | static void | |
649 | xfs_agfl_write_verify( | |
650 | struct xfs_buf *bp) | |
651 | { | |
7861ef77 | 652 | struct xfs_mount *mp = bp->b_mount; |
37d086ca | 653 | struct xfs_buf_log_item *bip = bp->b_log_item; |
1e697959 | 654 | xfs_failaddr_t fa; |
a2ceac1f | 655 | |
dd5b876e DC |
656 | /* no verification of non-crc AGFLs */ |
657 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
658 | return; | |
659 | ||
1e697959 DW |
660 | fa = xfs_agfl_verify(bp); |
661 | if (fa) { | |
662 | xfs_verifier_error(bp, -EFSCORRUPTED, fa); | |
dd5b876e DC |
663 | return; |
664 | } | |
665 | ||
666 | if (bip) | |
667 | XFS_BUF_TO_AGFL(bp)->agfl_lsn = cpu_to_be64(bip->bli_item.li_lsn); | |
668 | ||
43b5aeed | 669 | xfs_buf_update_cksum(bp, XFS_AGFL_CRC_OFF); |
a2ceac1f DC |
670 | } |
671 | ||
672 | const struct xfs_buf_ops xfs_agfl_buf_ops = { | |
a3fac935 | 673 | .name = "xfs_agfl", |
68dbe77f | 674 | .magic = { cpu_to_be32(XFS_AGFL_MAGIC), cpu_to_be32(XFS_AGFL_MAGIC) }, |
a2ceac1f DC |
675 | .verify_read = xfs_agfl_read_verify, |
676 | .verify_write = xfs_agfl_write_verify, | |
95d9582b | 677 | .verify_struct = xfs_agfl_verify, |
a2ceac1f DC |
678 | }; |
679 | ||
2bd0ea18 NS |
680 | /* |
681 | * Read in the allocation group free block array. | |
682 | */ | |
50bb67d6 | 683 | int /* error */ |
2bd0ea18 NS |
684 | xfs_alloc_read_agfl( |
685 | xfs_mount_t *mp, /* mount point structure */ | |
686 | xfs_trans_t *tp, /* transaction pointer */ | |
687 | xfs_agnumber_t agno, /* allocation group number */ | |
688 | xfs_buf_t **bpp) /* buffer for the ag free block array */ | |
689 | { | |
690 | xfs_buf_t *bp; /* return value */ | |
2bd0ea18 NS |
691 | int error; |
692 | ||
693 | ASSERT(agno != NULLAGNUMBER); | |
9440d84d NS |
694 | error = xfs_trans_read_buf( |
695 | mp, tp, mp->m_ddev_targp, | |
696 | XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)), | |
a2ceac1f | 697 | XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_agfl_buf_ops); |
9440d84d | 698 | if (error) |
2bd0ea18 | 699 | return error; |
a2ceac1f | 700 | xfs_buf_set_ref(bp, XFS_AGFL_REF); |
2bd0ea18 NS |
701 | *bpp = bp; |
702 | return 0; | |
703 | } | |
704 | ||
a2ceac1f DC |
705 | STATIC int |
706 | xfs_alloc_update_counters( | |
707 | struct xfs_trans *tp, | |
708 | struct xfs_perag *pag, | |
709 | struct xfs_buf *agbp, | |
710 | long len) | |
711 | { | |
712 | struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); | |
713 | ||
714 | pag->pagf_freeblks += len; | |
715 | be32_add_cpu(&agf->agf_freeblks, len); | |
716 | ||
717 | xfs_trans_agblocks_delta(tp, len); | |
718 | if (unlikely(be32_to_cpu(agf->agf_freeblks) > | |
a0264b73 DW |
719 | be32_to_cpu(agf->agf_length))) { |
720 | xfs_buf_corruption_error(agbp); | |
12b53197 | 721 | return -EFSCORRUPTED; |
a0264b73 | 722 | } |
a2ceac1f DC |
723 | |
724 | xfs_alloc_log_agf(tp, agbp, XFS_AGF_FREEBLKS); | |
725 | return 0; | |
726 | } | |
727 | ||
2bd0ea18 | 728 | /* |
2950989c | 729 | * Block allocation algorithm and data structures. |
2bd0ea18 | 730 | */ |
2950989c BF |
731 | struct xfs_alloc_cur { |
732 | struct xfs_btree_cur *cnt; /* btree cursors */ | |
733 | struct xfs_btree_cur *bnolt; | |
734 | struct xfs_btree_cur *bnogt; | |
4d66edb1 | 735 | xfs_extlen_t cur_len;/* current search length */ |
19fe42e3 BF |
736 | xfs_agblock_t rec_bno;/* extent startblock */ |
737 | xfs_extlen_t rec_len;/* extent length */ | |
738 | xfs_agblock_t bno; /* alloc bno */ | |
739 | xfs_extlen_t len; /* alloc len */ | |
740 | xfs_extlen_t diff; /* diff from search bno */ | |
e055d59e BF |
741 | unsigned int busy_gen;/* busy state */ |
742 | bool busy; | |
2950989c BF |
743 | }; |
744 | ||
745 | /* | |
746 | * Set up cursors, etc. in the extent allocation cursor. This function can be | |
747 | * called multiple times to reset an initialized structure without having to | |
748 | * reallocate cursors. | |
749 | */ | |
750 | static int | |
751 | xfs_alloc_cur_setup( | |
752 | struct xfs_alloc_arg *args, | |
753 | struct xfs_alloc_cur *acur) | |
754 | { | |
755 | int error; | |
756 | int i; | |
757 | ||
758 | ASSERT(args->alignment == 1 || args->type != XFS_ALLOCTYPE_THIS_BNO); | |
759 | ||
4d66edb1 | 760 | acur->cur_len = args->maxlen; |
19fe42e3 BF |
761 | acur->rec_bno = 0; |
762 | acur->rec_len = 0; | |
763 | acur->bno = 0; | |
764 | acur->len = 0; | |
04ea0ac1 | 765 | acur->diff = -1; |
e055d59e BF |
766 | acur->busy = false; |
767 | acur->busy_gen = 0; | |
768 | ||
2950989c BF |
769 | /* |
770 | * Perform an initial cntbt lookup to check for availability of maxlen | |
771 | * extents. If this fails, we'll return -ENOSPC to signal the caller to | |
772 | * attempt a small allocation. | |
773 | */ | |
774 | if (!acur->cnt) | |
775 | acur->cnt = xfs_allocbt_init_cursor(args->mp, args->tp, | |
776 | args->agbp, args->agno, XFS_BTNUM_CNT); | |
777 | error = xfs_alloc_lookup_ge(acur->cnt, 0, args->maxlen, &i); | |
778 | if (error) | |
779 | return error; | |
780 | ||
781 | /* | |
782 | * Allocate the bnobt left and right search cursors. | |
783 | */ | |
784 | if (!acur->bnolt) | |
785 | acur->bnolt = xfs_allocbt_init_cursor(args->mp, args->tp, | |
786 | args->agbp, args->agno, XFS_BTNUM_BNO); | |
787 | if (!acur->bnogt) | |
788 | acur->bnogt = xfs_allocbt_init_cursor(args->mp, args->tp, | |
789 | args->agbp, args->agno, XFS_BTNUM_BNO); | |
790 | return i == 1 ? 0 : -ENOSPC; | |
791 | } | |
792 | ||
793 | static void | |
794 | xfs_alloc_cur_close( | |
795 | struct xfs_alloc_cur *acur, | |
796 | bool error) | |
797 | { | |
798 | int cur_error = XFS_BTREE_NOERROR; | |
799 | ||
800 | if (error) | |
801 | cur_error = XFS_BTREE_ERROR; | |
802 | ||
803 | if (acur->cnt) | |
804 | xfs_btree_del_cursor(acur->cnt, cur_error); | |
805 | if (acur->bnolt) | |
806 | xfs_btree_del_cursor(acur->bnolt, cur_error); | |
807 | if (acur->bnogt) | |
808 | xfs_btree_del_cursor(acur->bnogt, cur_error); | |
809 | acur->cnt = acur->bnolt = acur->bnogt = NULL; | |
810 | } | |
2bd0ea18 | 811 | |
04ea0ac1 BF |
812 | /* |
813 | * Check an extent for allocation and track the best available candidate in the | |
814 | * allocation structure. The cursor is deactivated if it has entered an out of | |
815 | * range state based on allocation arguments. Optionally return the extent | |
816 | * extent geometry and allocation status if requested by the caller. | |
817 | */ | |
818 | static int | |
819 | xfs_alloc_cur_check( | |
820 | struct xfs_alloc_arg *args, | |
821 | struct xfs_alloc_cur *acur, | |
822 | struct xfs_btree_cur *cur, | |
823 | int *new) | |
824 | { | |
825 | int error, i; | |
826 | xfs_agblock_t bno, bnoa, bnew; | |
827 | xfs_extlen_t len, lena, diff = -1; | |
828 | bool busy; | |
829 | unsigned busy_gen = 0; | |
830 | bool deactivate = false; | |
3ca39168 | 831 | bool isbnobt = cur->bc_btnum == XFS_BTNUM_BNO; |
04ea0ac1 BF |
832 | |
833 | *new = 0; | |
834 | ||
835 | error = xfs_alloc_get_rec(cur, &bno, &len, &i); | |
836 | if (error) | |
837 | return error; | |
fbb4fa7f DW |
838 | if (XFS_IS_CORRUPT(args->mp, i != 1)) |
839 | return -EFSCORRUPTED; | |
04ea0ac1 BF |
840 | |
841 | /* | |
842 | * Check minlen and deactivate a cntbt cursor if out of acceptable size | |
843 | * range (i.e., walking backwards looking for a minlen extent). | |
844 | */ | |
845 | if (len < args->minlen) { | |
3ca39168 | 846 | deactivate = !isbnobt; |
04ea0ac1 BF |
847 | goto out; |
848 | } | |
849 | ||
850 | busy = xfs_alloc_compute_aligned(args, bno, len, &bnoa, &lena, | |
851 | &busy_gen); | |
852 | acur->busy |= busy; | |
853 | if (busy) | |
854 | acur->busy_gen = busy_gen; | |
855 | /* deactivate a bnobt cursor outside of locality range */ | |
3ca39168 BF |
856 | if (bnoa < args->min_agbno || bnoa > args->max_agbno) { |
857 | deactivate = isbnobt; | |
04ea0ac1 | 858 | goto out; |
3ca39168 | 859 | } |
04ea0ac1 BF |
860 | if (lena < args->minlen) |
861 | goto out; | |
862 | ||
863 | args->len = XFS_EXTLEN_MIN(lena, args->maxlen); | |
864 | xfs_alloc_fix_len(args); | |
865 | ASSERT(args->len >= args->minlen); | |
866 | if (args->len < acur->len) | |
867 | goto out; | |
868 | ||
869 | /* | |
870 | * We have an aligned record that satisfies minlen and beats or matches | |
871 | * the candidate extent size. Compare locality for near allocation mode. | |
872 | */ | |
873 | ASSERT(args->type == XFS_ALLOCTYPE_NEAR_BNO); | |
874 | diff = xfs_alloc_compute_diff(args->agbno, args->len, | |
875 | args->alignment, args->datatype, | |
876 | bnoa, lena, &bnew); | |
877 | if (bnew == NULLAGBLOCK) | |
878 | goto out; | |
3ca39168 BF |
879 | |
880 | /* | |
881 | * Deactivate a bnobt cursor with worse locality than the current best. | |
882 | */ | |
883 | if (diff > acur->diff) { | |
884 | deactivate = isbnobt; | |
04ea0ac1 | 885 | goto out; |
3ca39168 | 886 | } |
04ea0ac1 BF |
887 | |
888 | ASSERT(args->len > acur->len || | |
889 | (args->len == acur->len && diff <= acur->diff)); | |
890 | acur->rec_bno = bno; | |
891 | acur->rec_len = len; | |
892 | acur->bno = bnew; | |
893 | acur->len = args->len; | |
894 | acur->diff = diff; | |
895 | *new = 1; | |
896 | ||
4f2eee5a BF |
897 | /* |
898 | * We're done if we found a perfect allocation. This only deactivates | |
899 | * the current cursor, but this is just an optimization to terminate a | |
900 | * cntbt search that otherwise runs to the edge of the tree. | |
901 | */ | |
902 | if (acur->diff == 0 && acur->len == args->maxlen) | |
903 | deactivate = true; | |
04ea0ac1 BF |
904 | out: |
905 | if (deactivate) | |
906 | cur->bc_private.a.priv.abt.active = false; | |
907 | trace_xfs_alloc_cur_check(args->mp, cur->bc_btnum, bno, len, diff, | |
908 | *new); | |
909 | return 0; | |
910 | } | |
911 | ||
dacde37d BF |
912 | /* |
913 | * Complete an allocation of a candidate extent. Remove the extent from both | |
914 | * trees and update the args structure. | |
915 | */ | |
916 | STATIC int | |
917 | xfs_alloc_cur_finish( | |
918 | struct xfs_alloc_arg *args, | |
919 | struct xfs_alloc_cur *acur) | |
920 | { | |
921 | int error; | |
922 | ||
923 | ASSERT(acur->cnt && acur->bnolt); | |
924 | ASSERT(acur->bno >= acur->rec_bno); | |
925 | ASSERT(acur->bno + acur->len <= acur->rec_bno + acur->rec_len); | |
926 | ASSERT(acur->rec_bno + acur->rec_len <= | |
927 | be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length)); | |
928 | ||
929 | error = xfs_alloc_fixup_trees(acur->cnt, acur->bnolt, acur->rec_bno, | |
930 | acur->rec_len, acur->bno, acur->len, 0); | |
931 | if (error) | |
932 | return error; | |
933 | ||
934 | args->agbno = acur->bno; | |
935 | args->len = acur->len; | |
936 | args->wasfromfl = 0; | |
937 | ||
938 | trace_xfs_alloc_cur(args); | |
939 | return 0; | |
940 | } | |
941 | ||
4d66edb1 BF |
942 | /* |
943 | * Locality allocation lookup algorithm. This expects a cntbt cursor and uses | |
944 | * bno optimized lookup to search for extents with ideal size and locality. | |
945 | */ | |
946 | STATIC int | |
947 | xfs_alloc_cntbt_iter( | |
948 | struct xfs_alloc_arg *args, | |
949 | struct xfs_alloc_cur *acur) | |
950 | { | |
951 | struct xfs_btree_cur *cur = acur->cnt; | |
952 | xfs_agblock_t bno; | |
953 | xfs_extlen_t len, cur_len; | |
954 | int error; | |
955 | int i; | |
956 | ||
957 | if (!xfs_alloc_cur_active(cur)) | |
958 | return 0; | |
959 | ||
960 | /* locality optimized lookup */ | |
961 | cur_len = acur->cur_len; | |
962 | error = xfs_alloc_lookup_ge(cur, args->agbno, cur_len, &i); | |
963 | if (error) | |
964 | return error; | |
965 | if (i == 0) | |
966 | return 0; | |
967 | error = xfs_alloc_get_rec(cur, &bno, &len, &i); | |
968 | if (error) | |
969 | return error; | |
970 | ||
971 | /* check the current record and update search length from it */ | |
972 | error = xfs_alloc_cur_check(args, acur, cur, &i); | |
973 | if (error) | |
974 | return error; | |
975 | ASSERT(len >= acur->cur_len); | |
976 | acur->cur_len = len; | |
977 | ||
978 | /* | |
979 | * We looked up the first record >= [agbno, len] above. The agbno is a | |
980 | * secondary key and so the current record may lie just before or after | |
981 | * agbno. If it is past agbno, check the previous record too so long as | |
982 | * the length matches as it may be closer. Don't check a smaller record | |
983 | * because that could deactivate our cursor. | |
984 | */ | |
985 | if (bno > args->agbno) { | |
986 | error = xfs_btree_decrement(cur, 0, &i); | |
987 | if (!error && i) { | |
988 | error = xfs_alloc_get_rec(cur, &bno, &len, &i); | |
989 | if (!error && i && len == acur->cur_len) | |
990 | error = xfs_alloc_cur_check(args, acur, cur, | |
991 | &i); | |
992 | } | |
993 | if (error) | |
994 | return error; | |
995 | } | |
996 | ||
997 | /* | |
998 | * Increment the search key until we find at least one allocation | |
999 | * candidate or if the extent we found was larger. Otherwise, double the | |
1000 | * search key to optimize the search. Efficiency is more important here | |
1001 | * than absolute best locality. | |
1002 | */ | |
1003 | cur_len <<= 1; | |
1004 | if (!acur->len || acur->cur_len >= cur_len) | |
1005 | acur->cur_len++; | |
1006 | else | |
1007 | acur->cur_len = cur_len; | |
1008 | ||
1009 | return error; | |
1010 | } | |
1011 | ||
ba02381c BF |
1012 | /* |
1013 | * Deal with the case where only small freespaces remain. Either return the | |
1014 | * contents of the last freespace record, or allocate space from the freelist if | |
1015 | * there is nothing in the tree. | |
1016 | */ | |
1017 | STATIC int /* error */ | |
1018 | xfs_alloc_ag_vextent_small( | |
1019 | struct xfs_alloc_arg *args, /* allocation argument structure */ | |
1020 | struct xfs_btree_cur *ccur, /* optional by-size cursor */ | |
1021 | xfs_agblock_t *fbnop, /* result block number */ | |
1022 | xfs_extlen_t *flenp, /* result length */ | |
1023 | int *stat) /* status: 0-freelist, 1-normal/none */ | |
1024 | { | |
1025 | int error = 0; | |
1026 | xfs_agblock_t fbno = NULLAGBLOCK; | |
1027 | xfs_extlen_t flen = 0; | |
9e1862f0 | 1028 | int i = 0; |
ba02381c | 1029 | |
9e1862f0 BF |
1030 | /* |
1031 | * If a cntbt cursor is provided, try to allocate the largest record in | |
1032 | * the tree. Try the AGFL if the cntbt is empty, otherwise fail the | |
1033 | * allocation. Make sure to respect minleft even when pulling from the | |
1034 | * freelist. | |
1035 | */ | |
1036 | if (ccur) | |
1037 | error = xfs_btree_decrement(ccur, 0, &i); | |
ba02381c BF |
1038 | if (error) |
1039 | goto error; | |
1040 | if (i) { | |
1041 | error = xfs_alloc_get_rec(ccur, &fbno, &flen, &i); | |
1042 | if (error) | |
1043 | goto error; | |
fbb4fa7f DW |
1044 | if (XFS_IS_CORRUPT(args->mp, i != 1)) { |
1045 | error = -EFSCORRUPTED; | |
1046 | goto error; | |
1047 | } | |
ba02381c BF |
1048 | goto out; |
1049 | } | |
1050 | ||
1051 | if (args->minlen != 1 || args->alignment != 1 || | |
1052 | args->resv == XFS_AG_RESV_AGFL || | |
1053 | (be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_flcount) <= | |
1054 | args->minleft)) | |
1055 | goto out; | |
1056 | ||
1057 | error = xfs_alloc_get_freelist(args->tp, args->agbp, &fbno, 0); | |
1058 | if (error) | |
1059 | goto error; | |
1060 | if (fbno == NULLAGBLOCK) | |
1061 | goto out; | |
1062 | ||
1063 | xfs_extent_busy_reuse(args->mp, args->agno, fbno, 1, | |
a85522b6 | 1064 | (args->datatype & XFS_ALLOC_NOBUSY)); |
ba02381c | 1065 | |
a85522b6 | 1066 | if (args->datatype & XFS_ALLOC_USERDATA) { |
ba02381c BF |
1067 | struct xfs_buf *bp; |
1068 | ||
78fcd346 DW |
1069 | error = xfs_trans_get_buf(args->tp, args->mp->m_ddev_targp, |
1070 | XFS_AGB_TO_DADDR(args->mp, args->agno, fbno), | |
1071 | args->mp->m_bsize, 0, &bp); | |
1072 | if (error) | |
ba02381c | 1073 | goto error; |
ba02381c BF |
1074 | xfs_trans_binval(args->tp, bp); |
1075 | } | |
2d7ea81f BF |
1076 | *fbnop = args->agbno = fbno; |
1077 | *flenp = args->len = 1; | |
fbb4fa7f DW |
1078 | if (XFS_IS_CORRUPT(args->mp, |
1079 | fbno >= be32_to_cpu( | |
1080 | XFS_BUF_TO_AGF(args->agbp)->agf_length))) { | |
1081 | error = -EFSCORRUPTED; | |
1082 | goto error; | |
1083 | } | |
ba02381c BF |
1084 | args->wasfromfl = 1; |
1085 | trace_xfs_alloc_small_freelist(args); | |
1086 | ||
1087 | /* | |
1088 | * If we're feeding an AGFL block to something that doesn't live in the | |
1089 | * free space, we need to clear out the OWN_AG rmap. | |
1090 | */ | |
1091 | error = xfs_rmap_free(args->tp, args->agbp, args->agno, fbno, 1, | |
1092 | &XFS_RMAP_OINFO_AG); | |
1093 | if (error) | |
1094 | goto error; | |
1095 | ||
1096 | *stat = 0; | |
1097 | return 0; | |
1098 | ||
1099 | out: | |
1100 | /* | |
1101 | * Can't do the allocation, give up. | |
1102 | */ | |
1103 | if (flen < args->minlen) { | |
1104 | args->agbno = NULLAGBLOCK; | |
1105 | trace_xfs_alloc_small_notenough(args); | |
1106 | flen = 0; | |
1107 | } | |
1108 | *fbnop = fbno; | |
1109 | *flenp = flen; | |
1110 | *stat = 1; | |
1111 | trace_xfs_alloc_small_done(args); | |
1112 | return 0; | |
1113 | ||
1114 | error: | |
1115 | trace_xfs_alloc_small_error(args); | |
1116 | return error; | |
1117 | } | |
1118 | ||
2bd0ea18 NS |
1119 | /* |
1120 | * Allocate a variable extent in the allocation group agno. | |
1121 | * Type and bno are used to determine where in the allocation group the | |
1122 | * extent will start. | |
1123 | * Extent's length (returned in *len) will be between minlen and maxlen, | |
1124 | * and of the form k * prod + mod unless there's nothing that large. | |
1125 | * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. | |
1126 | */ | |
1127 | STATIC int /* error */ | |
1128 | xfs_alloc_ag_vextent( | |
dfc130f3 | 1129 | xfs_alloc_arg_t *args) /* argument structure for allocation */ |
2bd0ea18 | 1130 | { |
0e266570 | 1131 | int error=0; |
2bd0ea18 NS |
1132 | |
1133 | ASSERT(args->minlen > 0); | |
1134 | ASSERT(args->maxlen > 0); | |
1135 | ASSERT(args->minlen <= args->maxlen); | |
1136 | ASSERT(args->mod < args->prod); | |
1137 | ASSERT(args->alignment > 0); | |
cf8ce220 | 1138 | |
2bd0ea18 NS |
1139 | /* |
1140 | * Branch to correct routine based on the type. | |
1141 | */ | |
1142 | args->wasfromfl = 0; | |
1143 | switch (args->type) { | |
1144 | case XFS_ALLOCTYPE_THIS_AG: | |
1145 | error = xfs_alloc_ag_vextent_size(args); | |
1146 | break; | |
1147 | case XFS_ALLOCTYPE_NEAR_BNO: | |
1148 | error = xfs_alloc_ag_vextent_near(args); | |
1149 | break; | |
1150 | case XFS_ALLOCTYPE_THIS_BNO: | |
1151 | error = xfs_alloc_ag_vextent_exact(args); | |
1152 | break; | |
1153 | default: | |
1154 | ASSERT(0); | |
1155 | /* NOTREACHED */ | |
1156 | } | |
a2ceac1f DC |
1157 | |
1158 | if (error || args->agbno == NULLAGBLOCK) | |
2bd0ea18 | 1159 | return error; |
2bd0ea18 | 1160 | |
a2ceac1f DC |
1161 | ASSERT(args->len >= args->minlen); |
1162 | ASSERT(args->len <= args->maxlen); | |
9760cac2 | 1163 | ASSERT(!args->wasfromfl || args->resv != XFS_AG_RESV_AGFL); |
a2ceac1f DC |
1164 | ASSERT(args->agbno % args->alignment == 0); |
1165 | ||
631ac87a | 1166 | /* if not file data, insert new block into the reverse map btree */ |
3ee858aa | 1167 | if (!xfs_rmap_should_skip_owner_update(&args->oinfo)) { |
631ac87a DW |
1168 | error = xfs_rmap_alloc(args->tp, args->agbp, args->agno, |
1169 | args->agbno, args->len, &args->oinfo); | |
1170 | if (error) | |
1171 | return error; | |
1172 | } | |
1173 | ||
a2ceac1f DC |
1174 | if (!args->wasfromfl) { |
1175 | error = xfs_alloc_update_counters(args->tp, args->pag, | |
1176 | args->agbp, | |
1177 | -((long)(args->len))); | |
1178 | if (error) | |
1179 | return error; | |
1180 | ||
1181 | ASSERT(!xfs_extent_busy_search(args->mp, args->agno, | |
1182 | args->agbno, args->len)); | |
2bd0ea18 | 1183 | } |
a2ceac1f | 1184 | |
cf8ce220 | 1185 | xfs_ag_resv_alloc_extent(args->pag, args->resv, args); |
a2ceac1f | 1186 | |
79896434 BD |
1187 | XFS_STATS_INC(args->mp, xs_allocx); |
1188 | XFS_STATS_ADD(args->mp, xs_allocb, args->len); | |
a2ceac1f | 1189 | return error; |
2bd0ea18 NS |
1190 | } |
1191 | ||
1192 | /* | |
1193 | * Allocate a variable extent at exactly agno/bno. | |
1194 | * Extent's length (returned in *len) will be between minlen and maxlen, | |
1195 | * and of the form k * prod + mod unless there's nothing that large. | |
1196 | * Return the starting a.g. block (bno), or NULLAGBLOCK if we can't do it. | |
1197 | */ | |
1198 | STATIC int /* error */ | |
1199 | xfs_alloc_ag_vextent_exact( | |
dfc130f3 | 1200 | xfs_alloc_arg_t *args) /* allocation argument structure */ |
2bd0ea18 | 1201 | { |
dfc130f3 RC |
1202 | xfs_btree_cur_t *bno_cur;/* by block-number btree cursor */ |
1203 | xfs_btree_cur_t *cnt_cur;/* by count btree cursor */ | |
2bd0ea18 NS |
1204 | int error; |
1205 | xfs_agblock_t fbno; /* start block of found extent */ | |
2bd0ea18 | 1206 | xfs_extlen_t flen; /* length of found extent */ |
cd80de04 CH |
1207 | xfs_agblock_t tbno; /* start block of busy extent */ |
1208 | xfs_extlen_t tlen; /* length of busy extent */ | |
1209 | xfs_agblock_t tend; /* end block of busy extent */ | |
2bd0ea18 | 1210 | int i; /* success/failure of operation */ |
cd80de04 | 1211 | unsigned busy_gen; |
2bd0ea18 NS |
1212 | |
1213 | ASSERT(args->alignment == 1); | |
a2ceac1f | 1214 | |
2bd0ea18 NS |
1215 | /* |
1216 | * Allocate/initialize a cursor for the by-number freespace btree. | |
1217 | */ | |
b194c7d8 | 1218 | bno_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
56b2de80 DC |
1219 | args->agno, XFS_BTNUM_BNO); |
1220 | ||
2bd0ea18 NS |
1221 | /* |
1222 | * Lookup bno and minlen in the btree (minlen is irrelevant, really). | |
1223 | * Look for the closest free block <= bno, it must contain bno | |
1224 | * if any free block does. | |
1225 | */ | |
56b2de80 DC |
1226 | error = xfs_alloc_lookup_le(bno_cur, args->agbno, args->minlen, &i); |
1227 | if (error) | |
2bd0ea18 | 1228 | goto error0; |
56b2de80 DC |
1229 | if (!i) |
1230 | goto not_found; | |
1231 | ||
2bd0ea18 NS |
1232 | /* |
1233 | * Grab the freespace record. | |
1234 | */ | |
56b2de80 DC |
1235 | error = xfs_alloc_get_rec(bno_cur, &fbno, &flen, &i); |
1236 | if (error) | |
2bd0ea18 | 1237 | goto error0; |
fbb4fa7f DW |
1238 | if (XFS_IS_CORRUPT(args->mp, i != 1)) { |
1239 | error = -EFSCORRUPTED; | |
1240 | goto error0; | |
1241 | } | |
2bd0ea18 | 1242 | ASSERT(fbno <= args->agbno); |
56b2de80 | 1243 | |
5000d01d | 1244 | /* |
a2ceac1f DC |
1245 | * Check for overlapping busy extents. |
1246 | */ | |
cd80de04 CH |
1247 | tbno = fbno; |
1248 | tlen = flen; | |
1249 | xfs_extent_busy_trim(args, &tbno, &tlen, &busy_gen); | |
a2ceac1f DC |
1250 | |
1251 | /* | |
1252 | * Give up if the start of the extent is busy, or the freespace isn't | |
1253 | * long enough for the minimum request. | |
2bd0ea18 | 1254 | */ |
a2ceac1f DC |
1255 | if (tbno > args->agbno) |
1256 | goto not_found; | |
1257 | if (tlen < args->minlen) | |
1258 | goto not_found; | |
1259 | tend = tbno + tlen; | |
1260 | if (tend < args->agbno + args->minlen) | |
56b2de80 DC |
1261 | goto not_found; |
1262 | ||
2bd0ea18 NS |
1263 | /* |
1264 | * End of extent will be smaller of the freespace end and the | |
1265 | * maximal requested end. | |
56b2de80 | 1266 | * |
2bd0ea18 NS |
1267 | * Fix the length according to mod and prod if given. |
1268 | */ | |
a2ceac1f DC |
1269 | args->len = XFS_AGBLOCK_MIN(tend, args->agbno + args->maxlen) |
1270 | - args->agbno; | |
2bd0ea18 | 1271 | xfs_alloc_fix_len(args); |
a2ceac1f | 1272 | ASSERT(args->agbno + args->len <= tend); |
56b2de80 | 1273 | |
2bd0ea18 | 1274 | /* |
a2ceac1f | 1275 | * We are allocating agbno for args->len |
2bd0ea18 NS |
1276 | * Allocate/initialize a cursor for the by-size btree. |
1277 | */ | |
b194c7d8 BN |
1278 | cnt_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
1279 | args->agno, XFS_BTNUM_CNT); | |
2bd0ea18 | 1280 | ASSERT(args->agbno + args->len <= |
6e3140c7 | 1281 | be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length)); |
56b2de80 DC |
1282 | error = xfs_alloc_fixup_trees(cnt_cur, bno_cur, fbno, flen, args->agbno, |
1283 | args->len, XFSA_FIXUP_BNO_OK); | |
1284 | if (error) { | |
2bd0ea18 NS |
1285 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); |
1286 | goto error0; | |
1287 | } | |
a2ceac1f | 1288 | |
2bd0ea18 NS |
1289 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); |
1290 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
a2ceac1f | 1291 | |
2bd0ea18 | 1292 | args->wasfromfl = 0; |
56b2de80 DC |
1293 | trace_xfs_alloc_exact_done(args); |
1294 | return 0; | |
1295 | ||
1296 | not_found: | |
1297 | /* Didn't find it, return null. */ | |
1298 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
1299 | args->agbno = NULLAGBLOCK; | |
1300 | trace_xfs_alloc_exact_notfound(args); | |
2bd0ea18 NS |
1301 | return 0; |
1302 | ||
1303 | error0: | |
1304 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); | |
56b2de80 DC |
1305 | trace_xfs_alloc_exact_error(args); |
1306 | return error; | |
1307 | } | |
1308 | ||
1309 | /* | |
4f2eee5a BF |
1310 | * Search a given number of btree records in a given direction. Check each |
1311 | * record against the good extent we've already found. | |
56b2de80 DC |
1312 | */ |
1313 | STATIC int | |
4f2eee5a | 1314 | xfs_alloc_walk_iter( |
3ca39168 BF |
1315 | struct xfs_alloc_arg *args, |
1316 | struct xfs_alloc_cur *acur, | |
1317 | struct xfs_btree_cur *cur, | |
4f2eee5a BF |
1318 | bool increment, |
1319 | bool find_one, /* quit on first candidate */ | |
1320 | int count, /* rec count (-1 for infinite) */ | |
1321 | int *stat) | |
56b2de80 | 1322 | { |
56b2de80 DC |
1323 | int error; |
1324 | int i; | |
56b2de80 | 1325 | |
4f2eee5a BF |
1326 | *stat = 0; |
1327 | ||
56b2de80 | 1328 | /* |
3ca39168 BF |
1329 | * Search so long as the cursor is active or we find a better extent. |
1330 | * The cursor is deactivated if it extends beyond the range of the | |
1331 | * current allocation candidate. | |
56b2de80 | 1332 | */ |
4f2eee5a | 1333 | while (xfs_alloc_cur_active(cur) && count) { |
3ca39168 | 1334 | error = xfs_alloc_cur_check(args, acur, cur, &i); |
56b2de80 | 1335 | if (error) |
3ca39168 | 1336 | return error; |
4f2eee5a BF |
1337 | if (i == 1) { |
1338 | *stat = 1; | |
1339 | if (find_one) | |
1340 | break; | |
1341 | } | |
3ca39168 BF |
1342 | if (!xfs_alloc_cur_active(cur)) |
1343 | break; | |
56b2de80 | 1344 | |
3ca39168 BF |
1345 | if (increment) |
1346 | error = xfs_btree_increment(cur, 0, &i); | |
56b2de80 | 1347 | else |
3ca39168 | 1348 | error = xfs_btree_decrement(cur, 0, &i); |
56b2de80 | 1349 | if (error) |
3ca39168 BF |
1350 | return error; |
1351 | if (i == 0) | |
1352 | cur->bc_private.a.priv.abt.active = false; | |
4f2eee5a BF |
1353 | |
1354 | if (count > 0) | |
1355 | count--; | |
3ca39168 | 1356 | } |
56b2de80 | 1357 | |
56b2de80 | 1358 | return 0; |
2bd0ea18 NS |
1359 | } |
1360 | ||
d0ebd9ee | 1361 | /* |
4d66edb1 BF |
1362 | * Search the by-bno and by-size btrees in parallel in search of an extent with |
1363 | * ideal locality based on the NEAR mode ->agbno locality hint. | |
d0ebd9ee BF |
1364 | */ |
1365 | STATIC int | |
4d66edb1 | 1366 | xfs_alloc_ag_vextent_locality( |
d0ebd9ee BF |
1367 | struct xfs_alloc_arg *args, |
1368 | struct xfs_alloc_cur *acur, | |
1369 | int *stat) | |
1370 | { | |
1371 | struct xfs_btree_cur *fbcur = NULL; | |
1372 | int error; | |
1373 | int i; | |
1374 | bool fbinc; | |
1375 | ||
1376 | ASSERT(acur->len == 0); | |
1377 | ASSERT(args->type == XFS_ALLOCTYPE_NEAR_BNO); | |
1378 | ||
1379 | *stat = 0; | |
1380 | ||
4d66edb1 BF |
1381 | error = xfs_alloc_lookup_ge(acur->cnt, args->agbno, acur->cur_len, &i); |
1382 | if (error) | |
1383 | return error; | |
d0ebd9ee BF |
1384 | error = xfs_alloc_lookup_le(acur->bnolt, args->agbno, 0, &i); |
1385 | if (error) | |
1386 | return error; | |
1387 | error = xfs_alloc_lookup_ge(acur->bnogt, args->agbno, 0, &i); | |
1388 | if (error) | |
1389 | return error; | |
1390 | ||
1391 | /* | |
4d66edb1 BF |
1392 | * Search the bnobt and cntbt in parallel. Search the bnobt left and |
1393 | * right and lookup the closest extent to the locality hint for each | |
1394 | * extent size key in the cntbt. The entire search terminates | |
1395 | * immediately on a bnobt hit because that means we've found best case | |
1396 | * locality. Otherwise the search continues until the cntbt cursor runs | |
1397 | * off the end of the tree. If no allocation candidate is found at this | |
1398 | * point, give up on locality, walk backwards from the end of the cntbt | |
1399 | * and take the first available extent. | |
1400 | * | |
1401 | * The parallel tree searches balance each other out to provide fairly | |
1402 | * consistent performance for various situations. The bnobt search can | |
1403 | * have pathological behavior in the worst case scenario of larger | |
1404 | * allocation requests and fragmented free space. On the other hand, the | |
1405 | * bnobt is able to satisfy most smaller allocation requests much more | |
1406 | * quickly than the cntbt. The cntbt search can sift through fragmented | |
1407 | * free space and sets of free extents for larger allocation requests | |
1408 | * more quickly than the bnobt. Since the locality hint is just a hint | |
1409 | * and we don't want to scan the entire bnobt for perfect locality, the | |
1410 | * cntbt search essentially bounds the bnobt search such that we can | |
1411 | * find good enough locality at reasonable performance in most cases. | |
d0ebd9ee BF |
1412 | */ |
1413 | while (xfs_alloc_cur_active(acur->bnolt) || | |
4d66edb1 BF |
1414 | xfs_alloc_cur_active(acur->bnogt) || |
1415 | xfs_alloc_cur_active(acur->cnt)) { | |
1416 | ||
1417 | trace_xfs_alloc_cur_lookup(args); | |
1418 | ||
1419 | /* | |
1420 | * Search the bnobt left and right. In the case of a hit, finish | |
1421 | * the search in the opposite direction and we're done. | |
1422 | */ | |
d0ebd9ee BF |
1423 | error = xfs_alloc_walk_iter(args, acur, acur->bnolt, false, |
1424 | true, 1, &i); | |
1425 | if (error) | |
1426 | return error; | |
1427 | if (i == 1) { | |
1428 | trace_xfs_alloc_cur_left(args); | |
1429 | fbcur = acur->bnogt; | |
1430 | fbinc = true; | |
1431 | break; | |
1432 | } | |
d0ebd9ee BF |
1433 | error = xfs_alloc_walk_iter(args, acur, acur->bnogt, true, true, |
1434 | 1, &i); | |
1435 | if (error) | |
1436 | return error; | |
1437 | if (i == 1) { | |
1438 | trace_xfs_alloc_cur_right(args); | |
1439 | fbcur = acur->bnolt; | |
1440 | fbinc = false; | |
1441 | break; | |
1442 | } | |
4d66edb1 BF |
1443 | |
1444 | /* | |
1445 | * Check the extent with best locality based on the current | |
1446 | * extent size search key and keep track of the best candidate. | |
1447 | */ | |
1448 | error = xfs_alloc_cntbt_iter(args, acur); | |
1449 | if (error) | |
1450 | return error; | |
1451 | if (!xfs_alloc_cur_active(acur->cnt)) { | |
1452 | trace_xfs_alloc_cur_lookup_done(args); | |
1453 | break; | |
1454 | } | |
1455 | } | |
1456 | ||
1457 | /* | |
1458 | * If we failed to find anything due to busy extents, return empty | |
1459 | * handed so the caller can flush and retry. If no busy extents were | |
1460 | * found, walk backwards from the end of the cntbt as a last resort. | |
1461 | */ | |
1462 | if (!xfs_alloc_cur_active(acur->cnt) && !acur->len && !acur->busy) { | |
1463 | error = xfs_btree_decrement(acur->cnt, 0, &i); | |
1464 | if (error) | |
1465 | return error; | |
1466 | if (i) { | |
1467 | acur->cnt->bc_private.a.priv.abt.active = true; | |
1468 | fbcur = acur->cnt; | |
1469 | fbinc = false; | |
1470 | } | |
d0ebd9ee BF |
1471 | } |
1472 | ||
4d66edb1 BF |
1473 | /* |
1474 | * Search in the opposite direction for a better entry in the case of | |
1475 | * a bnobt hit or walk backwards from the end of the cntbt. | |
1476 | */ | |
d0ebd9ee BF |
1477 | if (fbcur) { |
1478 | error = xfs_alloc_walk_iter(args, acur, fbcur, fbinc, true, -1, | |
1479 | &i); | |
1480 | if (error) | |
1481 | return error; | |
1482 | } | |
1483 | ||
1484 | if (acur->len) | |
1485 | *stat = 1; | |
1486 | ||
1487 | return 0; | |
1488 | } | |
1489 | ||
0bb673ce DW |
1490 | /* Check the last block of the cnt btree for allocations. */ |
1491 | static int | |
1492 | xfs_alloc_ag_vextent_lastblock( | |
1493 | struct xfs_alloc_arg *args, | |
1494 | struct xfs_alloc_cur *acur, | |
1495 | xfs_agblock_t *bno, | |
1496 | xfs_extlen_t *len, | |
1497 | bool *allocated) | |
1498 | { | |
1499 | int error; | |
1500 | int i; | |
1501 | ||
1502 | #ifdef DEBUG | |
1503 | /* Randomly don't execute the first algorithm. */ | |
1504 | if (prandom_u32() & 1) | |
1505 | return 0; | |
1506 | #endif | |
1507 | ||
1508 | /* | |
1509 | * Start from the entry that lookup found, sequence through all larger | |
1510 | * free blocks. If we're actually pointing at a record smaller than | |
1511 | * maxlen, go to the start of this block, and skip all those smaller | |
1512 | * than minlen. | |
1513 | */ | |
1514 | if (len || args->alignment > 1) { | |
1515 | acur->cnt->bc_ptrs[0] = 1; | |
1516 | do { | |
1517 | error = xfs_alloc_get_rec(acur->cnt, bno, len, &i); | |
1518 | if (error) | |
1519 | return error; | |
fbb4fa7f DW |
1520 | if (XFS_IS_CORRUPT(args->mp, i != 1)) |
1521 | return -EFSCORRUPTED; | |
0bb673ce DW |
1522 | if (*len >= args->minlen) |
1523 | break; | |
1524 | error = xfs_btree_increment(acur->cnt, 0, &i); | |
1525 | if (error) | |
1526 | return error; | |
1527 | } while (i); | |
1528 | ASSERT(*len >= args->minlen); | |
1529 | if (!i) | |
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | error = xfs_alloc_walk_iter(args, acur, acur->cnt, true, false, -1, &i); | |
1534 | if (error) | |
1535 | return error; | |
1536 | ||
1537 | /* | |
1538 | * It didn't work. We COULD be in a case where there's a good record | |
1539 | * somewhere, so try again. | |
1540 | */ | |
1541 | if (acur->len == 0) | |
1542 | return 0; | |
1543 | ||
1544 | trace_xfs_alloc_near_first(args); | |
1545 | *allocated = true; | |
1546 | return 0; | |
1547 | } | |
1548 | ||
2bd0ea18 NS |
1549 | /* |
1550 | * Allocate a variable extent near bno in the allocation group agno. | |
1551 | * Extent's length (returned in len) will be between minlen and maxlen, | |
1552 | * and of the form k * prod + mod unless there's nothing that large. | |
1553 | * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. | |
1554 | */ | |
2950989c | 1555 | STATIC int |
2bd0ea18 | 1556 | xfs_alloc_ag_vextent_near( |
2950989c | 1557 | struct xfs_alloc_arg *args) |
2bd0ea18 | 1558 | { |
2950989c | 1559 | struct xfs_alloc_cur acur = {}; |
3ca39168 BF |
1560 | int error; /* error code */ |
1561 | int i; /* result code, temporary */ | |
3ca39168 BF |
1562 | xfs_agblock_t bno; |
1563 | xfs_extlen_t len; | |
a2ceac1f | 1564 | |
9bef1574 | 1565 | /* handle uninitialized agbno range so caller doesn't have to */ |
ff3263dd BF |
1566 | if (!args->min_agbno && !args->max_agbno) |
1567 | args->max_agbno = args->mp->m_sb.sb_agblocks - 1; | |
1568 | ASSERT(args->min_agbno <= args->max_agbno); | |
1569 | ||
1570 | /* clamp agbno to the range if it's outside */ | |
1571 | if (args->agbno < args->min_agbno) | |
1572 | args->agbno = args->min_agbno; | |
1573 | if (args->agbno > args->max_agbno) | |
1574 | args->agbno = args->max_agbno; | |
1575 | ||
a2ceac1f | 1576 | restart: |
3ca39168 | 1577 | len = 0; |
a2ceac1f | 1578 | |
2bd0ea18 | 1579 | /* |
2950989c BF |
1580 | * Set up cursors and see if there are any free extents as big as |
1581 | * maxlen. If not, pick the last entry in the tree unless the tree is | |
1582 | * empty. | |
5000d01d | 1583 | */ |
2950989c BF |
1584 | error = xfs_alloc_cur_setup(args, &acur); |
1585 | if (error == -ENOSPC) { | |
3ca39168 BF |
1586 | error = xfs_alloc_ag_vextent_small(args, acur.cnt, &bno, |
1587 | &len, &i); | |
2950989c BF |
1588 | if (error) |
1589 | goto out; | |
3ca39168 | 1590 | if (i == 0 || len == 0) { |
a2ceac1f | 1591 | trace_xfs_alloc_near_noentry(args); |
2950989c | 1592 | goto out; |
2bd0ea18 NS |
1593 | } |
1594 | ASSERT(i == 1); | |
2950989c BF |
1595 | } else if (error) { |
1596 | goto out; | |
2bd0ea18 | 1597 | } |
a2ceac1f | 1598 | |
5000d01d | 1599 | /* |
2bd0ea18 NS |
1600 | * First algorithm. |
1601 | * If the requested extent is large wrt the freespaces available | |
1602 | * in this a.g., then the cursor will be pointing to a btree entry | |
1603 | * near the right edge of the tree. If it's in the last btree leaf | |
1604 | * block, then we just examine all the entries in that block | |
1605 | * that are big enough, and pick the best one. | |
2bd0ea18 | 1606 | */ |
0bb673ce DW |
1607 | if (xfs_btree_islastblock(acur.cnt, 0)) { |
1608 | bool allocated = false; | |
4f2eee5a | 1609 | |
0bb673ce DW |
1610 | error = xfs_alloc_ag_vextent_lastblock(args, &acur, &bno, &len, |
1611 | &allocated); | |
4f2eee5a BF |
1612 | if (error) |
1613 | goto out; | |
0bb673ce DW |
1614 | if (allocated) |
1615 | goto alloc_finish; | |
2bd0ea18 | 1616 | } |
2950989c | 1617 | |
2bd0ea18 | 1618 | /* |
4d66edb1 BF |
1619 | * Second algorithm. Combined cntbt and bnobt search to find ideal |
1620 | * locality. | |
2bd0ea18 | 1621 | */ |
4d66edb1 | 1622 | error = xfs_alloc_ag_vextent_locality(args, &acur, &i); |
2950989c BF |
1623 | if (error) |
1624 | goto out; | |
1625 | ||
2bd0ea18 NS |
1626 | /* |
1627 | * If we couldn't get anything, give up. | |
1628 | */ | |
3ca39168 | 1629 | if (!acur.len) { |
e055d59e | 1630 | if (acur.busy) { |
a2ceac1f | 1631 | trace_xfs_alloc_near_busy(args); |
e055d59e BF |
1632 | xfs_extent_busy_flush(args->mp, args->pag, |
1633 | acur.busy_gen); | |
a2ceac1f DC |
1634 | goto restart; |
1635 | } | |
56b2de80 | 1636 | trace_xfs_alloc_size_neither(args); |
2bd0ea18 | 1637 | args->agbno = NULLAGBLOCK; |
2950989c | 1638 | goto out; |
2bd0ea18 | 1639 | } |
56b2de80 | 1640 | |
0bb673ce | 1641 | alloc_finish: |
dacde37d BF |
1642 | /* fix up btrees on a successful allocation */ |
1643 | error = xfs_alloc_cur_finish(args, &acur); | |
56b2de80 | 1644 | |
2950989c BF |
1645 | out: |
1646 | xfs_alloc_cur_close(&acur, error); | |
2bd0ea18 NS |
1647 | return error; |
1648 | } | |
1649 | ||
1650 | /* | |
1651 | * Allocate a variable extent anywhere in the allocation group agno. | |
1652 | * Extent's length (returned in len) will be between minlen and maxlen, | |
1653 | * and of the form k * prod + mod unless there's nothing that large. | |
1654 | * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. | |
1655 | */ | |
1656 | STATIC int /* error */ | |
1657 | xfs_alloc_ag_vextent_size( | |
dfc130f3 | 1658 | xfs_alloc_arg_t *args) /* allocation argument structure */ |
2bd0ea18 | 1659 | { |
dfc130f3 RC |
1660 | xfs_btree_cur_t *bno_cur; /* cursor for bno btree */ |
1661 | xfs_btree_cur_t *cnt_cur; /* cursor for cnt btree */ | |
2bd0ea18 NS |
1662 | int error; /* error result */ |
1663 | xfs_agblock_t fbno; /* start of found freespace */ | |
1664 | xfs_extlen_t flen; /* length of found freespace */ | |
2bd0ea18 NS |
1665 | int i; /* temp status variable */ |
1666 | xfs_agblock_t rbno; /* returned block number */ | |
1667 | xfs_extlen_t rlen; /* length of returned extent */ | |
cd80de04 CH |
1668 | bool busy; |
1669 | unsigned busy_gen; | |
2bd0ea18 | 1670 | |
a2ceac1f | 1671 | restart: |
2bd0ea18 NS |
1672 | /* |
1673 | * Allocate and initialize a cursor for the by-size btree. | |
1674 | */ | |
b194c7d8 BN |
1675 | cnt_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
1676 | args->agno, XFS_BTNUM_CNT); | |
2bd0ea18 | 1677 | bno_cur = NULL; |
cd80de04 | 1678 | busy = false; |
a2ceac1f | 1679 | |
2bd0ea18 NS |
1680 | /* |
1681 | * Look for an entry >= maxlen+alignment-1 blocks. | |
1682 | */ | |
0e266570 NS |
1683 | if ((error = xfs_alloc_lookup_ge(cnt_cur, 0, |
1684 | args->maxlen + args->alignment - 1, &i))) | |
2bd0ea18 | 1685 | goto error0; |
a2ceac1f | 1686 | |
2bd0ea18 | 1687 | /* |
cd80de04 CH |
1688 | * If none then we have to settle for a smaller extent. In the case that |
1689 | * there are no large extents, this will return the last entry in the | |
1690 | * tree unless the tree is empty. In the case that there are only busy | |
1691 | * large extents, this will return the largest small extent unless there | |
a2ceac1f | 1692 | * are no smaller extents available. |
5000d01d | 1693 | */ |
cd80de04 | 1694 | if (!i) { |
a2ceac1f DC |
1695 | error = xfs_alloc_ag_vextent_small(args, cnt_cur, |
1696 | &fbno, &flen, &i); | |
1697 | if (error) | |
2bd0ea18 NS |
1698 | goto error0; |
1699 | if (i == 0 || flen == 0) { | |
1700 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
56b2de80 | 1701 | trace_xfs_alloc_size_noentry(args); |
2bd0ea18 NS |
1702 | return 0; |
1703 | } | |
1704 | ASSERT(i == 1); | |
cd80de04 CH |
1705 | busy = xfs_alloc_compute_aligned(args, fbno, flen, &rbno, |
1706 | &rlen, &busy_gen); | |
a2ceac1f DC |
1707 | } else { |
1708 | /* | |
1709 | * Search for a non-busy extent that is large enough. | |
a2ceac1f DC |
1710 | */ |
1711 | for (;;) { | |
1712 | error = xfs_alloc_get_rec(cnt_cur, &fbno, &flen, &i); | |
1713 | if (error) | |
1714 | goto error0; | |
fbb4fa7f DW |
1715 | if (XFS_IS_CORRUPT(args->mp, i != 1)) { |
1716 | error = -EFSCORRUPTED; | |
1717 | goto error0; | |
1718 | } | |
a2ceac1f | 1719 | |
cd80de04 CH |
1720 | busy = xfs_alloc_compute_aligned(args, fbno, flen, |
1721 | &rbno, &rlen, &busy_gen); | |
a2ceac1f DC |
1722 | |
1723 | if (rlen >= args->maxlen) | |
1724 | break; | |
1725 | ||
1726 | error = xfs_btree_increment(cnt_cur, 0, &i); | |
1727 | if (error) | |
1728 | goto error0; | |
1729 | if (i == 0) { | |
1730 | /* | |
1731 | * Our only valid extents must have been busy. | |
1732 | * Make it unbusy by forcing the log out and | |
cd80de04 | 1733 | * retrying. |
a2ceac1f DC |
1734 | */ |
1735 | xfs_btree_del_cursor(cnt_cur, | |
1736 | XFS_BTREE_NOERROR); | |
1737 | trace_xfs_alloc_size_busy(args); | |
cd80de04 CH |
1738 | xfs_extent_busy_flush(args->mp, |
1739 | args->pag, busy_gen); | |
a2ceac1f DC |
1740 | goto restart; |
1741 | } | |
1742 | } | |
2bd0ea18 | 1743 | } |
a2ceac1f | 1744 | |
2bd0ea18 NS |
1745 | /* |
1746 | * In the first case above, we got the last entry in the | |
1747 | * by-size btree. Now we check to see if the space hits maxlen | |
1748 | * once aligned; if not, we search left for something better. | |
1749 | * This can't happen in the second case above. | |
1750 | */ | |
2bd0ea18 | 1751 | rlen = XFS_EXTLEN_MIN(args->maxlen, rlen); |
fbb4fa7f DW |
1752 | if (XFS_IS_CORRUPT(args->mp, |
1753 | rlen != 0 && | |
1754 | (rlen > flen || | |
1755 | rbno + rlen > fbno + flen))) { | |
1756 | error = -EFSCORRUPTED; | |
1757 | goto error0; | |
1758 | } | |
2bd0ea18 NS |
1759 | if (rlen < args->maxlen) { |
1760 | xfs_agblock_t bestfbno; | |
1761 | xfs_extlen_t bestflen; | |
1762 | xfs_agblock_t bestrbno; | |
1763 | xfs_extlen_t bestrlen; | |
1764 | ||
1765 | bestrlen = rlen; | |
1766 | bestrbno = rbno; | |
1767 | bestflen = flen; | |
1768 | bestfbno = fbno; | |
1769 | for (;;) { | |
b194c7d8 | 1770 | if ((error = xfs_btree_decrement(cnt_cur, 0, &i))) |
2bd0ea18 NS |
1771 | goto error0; |
1772 | if (i == 0) | |
1773 | break; | |
0e266570 NS |
1774 | if ((error = xfs_alloc_get_rec(cnt_cur, &fbno, &flen, |
1775 | &i))) | |
2bd0ea18 | 1776 | goto error0; |
fbb4fa7f DW |
1777 | if (XFS_IS_CORRUPT(args->mp, i != 1)) { |
1778 | error = -EFSCORRUPTED; | |
1779 | goto error0; | |
1780 | } | |
2bd0ea18 NS |
1781 | if (flen < bestrlen) |
1782 | break; | |
cd80de04 CH |
1783 | busy = xfs_alloc_compute_aligned(args, fbno, flen, |
1784 | &rbno, &rlen, &busy_gen); | |
2bd0ea18 | 1785 | rlen = XFS_EXTLEN_MIN(args->maxlen, rlen); |
fbb4fa7f DW |
1786 | if (XFS_IS_CORRUPT(args->mp, |
1787 | rlen != 0 && | |
1788 | (rlen > flen || | |
1789 | rbno + rlen > fbno + flen))) { | |
1790 | error = -EFSCORRUPTED; | |
1791 | goto error0; | |
1792 | } | |
2bd0ea18 NS |
1793 | if (rlen > bestrlen) { |
1794 | bestrlen = rlen; | |
1795 | bestrbno = rbno; | |
1796 | bestflen = flen; | |
1797 | bestfbno = fbno; | |
1798 | if (rlen == args->maxlen) | |
1799 | break; | |
1800 | } | |
5000d01d | 1801 | } |
0e266570 NS |
1802 | if ((error = xfs_alloc_lookup_eq(cnt_cur, bestfbno, bestflen, |
1803 | &i))) | |
2bd0ea18 | 1804 | goto error0; |
fbb4fa7f DW |
1805 | if (XFS_IS_CORRUPT(args->mp, i != 1)) { |
1806 | error = -EFSCORRUPTED; | |
1807 | goto error0; | |
1808 | } | |
2bd0ea18 NS |
1809 | rlen = bestrlen; |
1810 | rbno = bestrbno; | |
1811 | flen = bestflen; | |
1812 | fbno = bestfbno; | |
1813 | } | |
1814 | args->wasfromfl = 0; | |
1815 | /* | |
1816 | * Fix up the length. | |
1817 | */ | |
1818 | args->len = rlen; | |
a2ceac1f | 1819 | if (rlen < args->minlen) { |
cd80de04 | 1820 | if (busy) { |
a2ceac1f DC |
1821 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
1822 | trace_xfs_alloc_size_busy(args); | |
cd80de04 | 1823 | xfs_extent_busy_flush(args->mp, args->pag, busy_gen); |
a2ceac1f DC |
1824 | goto restart; |
1825 | } | |
1826 | goto out_nominleft; | |
2bd0ea18 | 1827 | } |
a2ceac1f DC |
1828 | xfs_alloc_fix_len(args); |
1829 | ||
2bd0ea18 | 1830 | rlen = args->len; |
fbb4fa7f DW |
1831 | if (XFS_IS_CORRUPT(args->mp, rlen > flen)) { |
1832 | error = -EFSCORRUPTED; | |
1833 | goto error0; | |
1834 | } | |
2bd0ea18 NS |
1835 | /* |
1836 | * Allocate and initialize a cursor for the by-block tree. | |
1837 | */ | |
b194c7d8 BN |
1838 | bno_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
1839 | args->agno, XFS_BTNUM_BNO); | |
0e266570 NS |
1840 | if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur, fbno, flen, |
1841 | rbno, rlen, XFSA_FIXUP_CNT_OK))) | |
2bd0ea18 NS |
1842 | goto error0; |
1843 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1844 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
1845 | cnt_cur = bno_cur = NULL; | |
1846 | args->len = rlen; | |
1847 | args->agbno = rbno; | |
fbb4fa7f DW |
1848 | if (XFS_IS_CORRUPT(args->mp, |
1849 | args->agbno + args->len > | |
1850 | be32_to_cpu( | |
1851 | XFS_BUF_TO_AGF(args->agbp)->agf_length))) { | |
1852 | error = -EFSCORRUPTED; | |
1853 | goto error0; | |
1854 | } | |
56b2de80 | 1855 | trace_xfs_alloc_size_done(args); |
2bd0ea18 NS |
1856 | return 0; |
1857 | ||
1858 | error0: | |
56b2de80 | 1859 | trace_xfs_alloc_size_error(args); |
2bd0ea18 NS |
1860 | if (cnt_cur) |
1861 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); | |
1862 | if (bno_cur) | |
1863 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); | |
1864 | return error; | |
a2ceac1f DC |
1865 | |
1866 | out_nominleft: | |
1867 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); | |
1868 | trace_xfs_alloc_size_nominleft(args); | |
1869 | args->agbno = NULLAGBLOCK; | |
1870 | return 0; | |
2bd0ea18 NS |
1871 | } |
1872 | ||
2bd0ea18 NS |
1873 | /* |
1874 | * Free the extent starting at agno/bno for length. | |
1875 | */ | |
85aec44f | 1876 | STATIC int |
2bd0ea18 | 1877 | xfs_free_ag_extent( |
5837e73b DW |
1878 | struct xfs_trans *tp, |
1879 | struct xfs_buf *agbp, | |
1880 | xfs_agnumber_t agno, | |
1881 | xfs_agblock_t bno, | |
1882 | xfs_extlen_t len, | |
1883 | const struct xfs_owner_info *oinfo, | |
1884 | enum xfs_ag_resv_type type) | |
2bd0ea18 | 1885 | { |
5837e73b DW |
1886 | struct xfs_mount *mp; |
1887 | struct xfs_perag *pag; | |
1888 | struct xfs_btree_cur *bno_cur; | |
1889 | struct xfs_btree_cur *cnt_cur; | |
1890 | xfs_agblock_t gtbno; /* start of right neighbor */ | |
1891 | xfs_extlen_t gtlen; /* length of right neighbor */ | |
1892 | xfs_agblock_t ltbno; /* start of left neighbor */ | |
1893 | xfs_extlen_t ltlen; /* length of left neighbor */ | |
1894 | xfs_agblock_t nbno; /* new starting block of freesp */ | |
1895 | xfs_extlen_t nlen; /* new length of freespace */ | |
1896 | int haveleft; /* have a left neighbor */ | |
1897 | int haveright; /* have a right neighbor */ | |
1898 | int i; | |
1899 | int error; | |
2bd0ea18 | 1900 | |
631ac87a | 1901 | bno_cur = cnt_cur = NULL; |
2bd0ea18 | 1902 | mp = tp->t_mountp; |
631ac87a | 1903 | |
3ee858aa | 1904 | if (!xfs_rmap_should_skip_owner_update(oinfo)) { |
631ac87a DW |
1905 | error = xfs_rmap_free(tp, agbp, agno, bno, len, oinfo); |
1906 | if (error) | |
1907 | goto error0; | |
1908 | } | |
1909 | ||
5000d01d | 1910 | /* |
2bd0ea18 NS |
1911 | * Allocate and initialize a cursor for the by-block btree. |
1912 | */ | |
b194c7d8 | 1913 | bno_cur = xfs_allocbt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_BNO); |
5000d01d | 1914 | /* |
2bd0ea18 NS |
1915 | * Look for a neighboring block on the left (lower block numbers) |
1916 | * that is contiguous with this space. | |
1917 | */ | |
0e266570 | 1918 | if ((error = xfs_alloc_lookup_le(bno_cur, bno, len, &haveleft))) |
2bd0ea18 NS |
1919 | goto error0; |
1920 | if (haveleft) { | |
1921 | /* | |
1922 | * There is a block to our left. | |
1923 | */ | |
0e266570 | 1924 | if ((error = xfs_alloc_get_rec(bno_cur, <bno, <len, &i))) |
2bd0ea18 | 1925 | goto error0; |
fbb4fa7f DW |
1926 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
1927 | error = -EFSCORRUPTED; | |
1928 | goto error0; | |
1929 | } | |
2bd0ea18 NS |
1930 | /* |
1931 | * It's not contiguous, though. | |
1932 | */ | |
1933 | if (ltbno + ltlen < bno) | |
1934 | haveleft = 0; | |
1935 | else { | |
1936 | /* | |
1937 | * If this failure happens the request to free this | |
1938 | * space was invalid, it's (partly) already free. | |
1939 | * Very bad. | |
1940 | */ | |
fbb4fa7f DW |
1941 | if (XFS_IS_CORRUPT(mp, ltbno + ltlen > bno)) { |
1942 | error = -EFSCORRUPTED; | |
1943 | goto error0; | |
1944 | } | |
2bd0ea18 NS |
1945 | } |
1946 | } | |
5000d01d | 1947 | /* |
2bd0ea18 NS |
1948 | * Look for a neighboring block on the right (higher block numbers) |
1949 | * that is contiguous with this space. | |
1950 | */ | |
b194c7d8 | 1951 | if ((error = xfs_btree_increment(bno_cur, 0, &haveright))) |
2bd0ea18 NS |
1952 | goto error0; |
1953 | if (haveright) { | |
1954 | /* | |
1955 | * There is a block to our right. | |
1956 | */ | |
0e266570 | 1957 | if ((error = xfs_alloc_get_rec(bno_cur, >bno, >len, &i))) |
2bd0ea18 | 1958 | goto error0; |
fbb4fa7f DW |
1959 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
1960 | error = -EFSCORRUPTED; | |
1961 | goto error0; | |
1962 | } | |
2bd0ea18 NS |
1963 | /* |
1964 | * It's not contiguous, though. | |
1965 | */ | |
1966 | if (bno + len < gtbno) | |
1967 | haveright = 0; | |
1968 | else { | |
1969 | /* | |
1970 | * If this failure happens the request to free this | |
1971 | * space was invalid, it's (partly) already free. | |
1972 | * Very bad. | |
1973 | */ | |
fbb4fa7f DW |
1974 | if (XFS_IS_CORRUPT(mp, bno + len > gtbno)) { |
1975 | error = -EFSCORRUPTED; | |
1976 | goto error0; | |
1977 | } | |
2bd0ea18 NS |
1978 | } |
1979 | } | |
1980 | /* | |
1981 | * Now allocate and initialize a cursor for the by-size tree. | |
1982 | */ | |
b194c7d8 | 1983 | cnt_cur = xfs_allocbt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_CNT); |
2bd0ea18 NS |
1984 | /* |
1985 | * Have both left and right contiguous neighbors. | |
1986 | * Merge all three into a single free block. | |
1987 | */ | |
1988 | if (haveleft && haveright) { | |
1989 | /* | |
1990 | * Delete the old by-size entry on the left. | |
1991 | */ | |
0e266570 | 1992 | if ((error = xfs_alloc_lookup_eq(cnt_cur, ltbno, ltlen, &i))) |
2bd0ea18 | 1993 | goto error0; |
fbb4fa7f DW |
1994 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
1995 | error = -EFSCORRUPTED; | |
1996 | goto error0; | |
1997 | } | |
b194c7d8 | 1998 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
2bd0ea18 | 1999 | goto error0; |
fbb4fa7f DW |
2000 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
2001 | error = -EFSCORRUPTED; | |
2002 | goto error0; | |
2003 | } | |
2bd0ea18 NS |
2004 | /* |
2005 | * Delete the old by-size entry on the right. | |
2006 | */ | |
0e266570 | 2007 | if ((error = xfs_alloc_lookup_eq(cnt_cur, gtbno, gtlen, &i))) |
2bd0ea18 | 2008 | goto error0; |
fbb4fa7f DW |
2009 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
2010 | error = -EFSCORRUPTED; | |
2011 | goto error0; | |
2012 | } | |
b194c7d8 | 2013 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
2bd0ea18 | 2014 | goto error0; |
fbb4fa7f DW |
2015 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
2016 | error = -EFSCORRUPTED; | |
2017 | goto error0; | |
2018 | } | |
2bd0ea18 NS |
2019 | /* |
2020 | * Delete the old by-block entry for the right block. | |
2021 | */ | |
b194c7d8 | 2022 | if ((error = xfs_btree_delete(bno_cur, &i))) |
2bd0ea18 | 2023 | goto error0; |
fbb4fa7f DW |
2024 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
2025 | error = -EFSCORRUPTED; | |
2026 | goto error0; | |
2027 | } | |
2bd0ea18 NS |
2028 | /* |
2029 | * Move the by-block cursor back to the left neighbor. | |
2030 | */ | |
b194c7d8 | 2031 | if ((error = xfs_btree_decrement(bno_cur, 0, &i))) |
2bd0ea18 | 2032 | goto error0; |
fbb4fa7f DW |
2033 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
2034 | error = -EFSCORRUPTED; | |
2035 | goto error0; | |
2036 | } | |
2bd0ea18 NS |
2037 | #ifdef DEBUG |
2038 | /* | |
2039 | * Check that this is the right record: delete didn't | |
2040 | * mangle the cursor. | |
2041 | */ | |
2042 | { | |
2043 | xfs_agblock_t xxbno; | |
2044 | xfs_extlen_t xxlen; | |
2045 | ||
0e266570 NS |
2046 | if ((error = xfs_alloc_get_rec(bno_cur, &xxbno, &xxlen, |
2047 | &i))) | |
2bd0ea18 | 2048 | goto error0; |
fbb4fa7f DW |
2049 | if (XFS_IS_CORRUPT(mp, |
2050 | i != 1 || | |
2051 | xxbno != ltbno || | |
2052 | xxlen != ltlen)) { | |
2053 | error = -EFSCORRUPTED; | |
2054 | goto error0; | |
2055 | } | |
2bd0ea18 NS |
2056 | } |
2057 | #endif | |
2058 | /* | |
2059 | * Update remaining by-block entry to the new, joined block. | |
2060 | */ | |
2061 | nbno = ltbno; | |
2062 | nlen = len + ltlen + gtlen; | |
0e266570 | 2063 | if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) |
2bd0ea18 NS |
2064 | goto error0; |
2065 | } | |
2066 | /* | |
2067 | * Have only a left contiguous neighbor. | |
2068 | * Merge it together with the new freespace. | |
2069 | */ | |
2070 | else if (haveleft) { | |
2071 | /* | |
2072 | * Delete the old by-size entry on the left. | |
2073 | */ | |
0e266570 | 2074 | if ((error = xfs_alloc_lookup_eq(cnt_cur, ltbno, ltlen, &i))) |
2bd0ea18 | 2075 | goto error0; |
fbb4fa7f DW |
2076 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
2077 | error = -EFSCORRUPTED; | |
2078 | goto error0; | |
2079 | } | |
b194c7d8 | 2080 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
2bd0ea18 | 2081 | goto error0; |
fbb4fa7f DW |
2082 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
2083 | error = -EFSCORRUPTED; | |
2084 | goto error0; | |
2085 | } | |
2bd0ea18 NS |
2086 | /* |
2087 | * Back up the by-block cursor to the left neighbor, and | |
2088 | * update its length. | |
2089 | */ | |
b194c7d8 | 2090 | if ((error = xfs_btree_decrement(bno_cur, 0, &i))) |
2bd0ea18 | 2091 | goto error0; |
fbb4fa7f DW |
2092 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
2093 | error = -EFSCORRUPTED; | |
2094 | goto error0; | |
2095 | } | |
2bd0ea18 NS |
2096 | nbno = ltbno; |
2097 | nlen = len + ltlen; | |
0e266570 | 2098 | if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) |
2bd0ea18 NS |
2099 | goto error0; |
2100 | } | |
2101 | /* | |
2102 | * Have only a right contiguous neighbor. | |
2103 | * Merge it together with the new freespace. | |
2104 | */ | |
2105 | else if (haveright) { | |
2106 | /* | |
2107 | * Delete the old by-size entry on the right. | |
2108 | */ | |
0e266570 | 2109 | if ((error = xfs_alloc_lookup_eq(cnt_cur, gtbno, gtlen, &i))) |
2bd0ea18 | 2110 | goto error0; |
fbb4fa7f DW |
2111 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
2112 | error = -EFSCORRUPTED; | |
2113 | goto error0; | |
2114 | } | |
b194c7d8 | 2115 | if ((error = xfs_btree_delete(cnt_cur, &i))) |
2bd0ea18 | 2116 | goto error0; |
fbb4fa7f DW |
2117 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
2118 | error = -EFSCORRUPTED; | |
2119 | goto error0; | |
2120 | } | |
2bd0ea18 | 2121 | /* |
5000d01d | 2122 | * Update the starting block and length of the right |
2bd0ea18 NS |
2123 | * neighbor in the by-block tree. |
2124 | */ | |
2125 | nbno = bno; | |
2126 | nlen = len + gtlen; | |
0e266570 | 2127 | if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) |
2bd0ea18 NS |
2128 | goto error0; |
2129 | } | |
2130 | /* | |
2131 | * No contiguous neighbors. | |
2132 | * Insert the new freespace into the by-block tree. | |
2133 | */ | |
2134 | else { | |
2135 | nbno = bno; | |
2136 | nlen = len; | |
b194c7d8 | 2137 | if ((error = xfs_btree_insert(bno_cur, &i))) |
2bd0ea18 | 2138 | goto error0; |
fbb4fa7f DW |
2139 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
2140 | error = -EFSCORRUPTED; | |
2141 | goto error0; | |
2142 | } | |
2bd0ea18 NS |
2143 | } |
2144 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); | |
2145 | bno_cur = NULL; | |
2146 | /* | |
2147 | * In all cases we need to insert the new freespace in the by-size tree. | |
2148 | */ | |
0e266570 | 2149 | if ((error = xfs_alloc_lookup_eq(cnt_cur, nbno, nlen, &i))) |
2bd0ea18 | 2150 | goto error0; |
fbb4fa7f DW |
2151 | if (XFS_IS_CORRUPT(mp, i != 0)) { |
2152 | error = -EFSCORRUPTED; | |
2153 | goto error0; | |
2154 | } | |
b194c7d8 | 2155 | if ((error = xfs_btree_insert(cnt_cur, &i))) |
2bd0ea18 | 2156 | goto error0; |
fbb4fa7f DW |
2157 | if (XFS_IS_CORRUPT(mp, i != 1)) { |
2158 | error = -EFSCORRUPTED; | |
2159 | goto error0; | |
2160 | } | |
2bd0ea18 NS |
2161 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
2162 | cnt_cur = NULL; | |
a2ceac1f | 2163 | |
2bd0ea18 NS |
2164 | /* |
2165 | * Update the freespace totals in the ag and superblock. | |
2166 | */ | |
a2ceac1f DC |
2167 | pag = xfs_perag_get(mp, agno); |
2168 | error = xfs_alloc_update_counters(tp, pag, agbp, len); | |
cf8ce220 | 2169 | xfs_ag_resv_free_extent(pag, type, tp, len); |
a2ceac1f DC |
2170 | xfs_perag_put(pag); |
2171 | if (error) | |
2172 | goto error0; | |
2173 | ||
79896434 BD |
2174 | XFS_STATS_INC(mp, xs_freex); |
2175 | XFS_STATS_ADD(mp, xs_freeb, len); | |
56b2de80 | 2176 | |
65a15e06 | 2177 | trace_xfs_free_extent(mp, agno, bno, len, type, haveleft, haveright); |
3e535bba | 2178 | |
2bd0ea18 NS |
2179 | return 0; |
2180 | ||
2181 | error0: | |
65a15e06 | 2182 | trace_xfs_free_extent(mp, agno, bno, len, type, -1, -1); |
2bd0ea18 NS |
2183 | if (bno_cur) |
2184 | xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); | |
2185 | if (cnt_cur) | |
2186 | xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); | |
2187 | return error; | |
2188 | } | |
2189 | ||
5000d01d | 2190 | /* |
2bd0ea18 NS |
2191 | * Visible (exported) allocation/free functions. |
2192 | * Some of these are used just by xfs_alloc_btree.c and this file. | |
2193 | */ | |
2194 | ||
2195 | /* | |
2196 | * Compute and fill in value of m_ag_maxlevels. | |
2197 | */ | |
2198 | void | |
2199 | xfs_alloc_compute_maxlevels( | |
2200 | xfs_mount_t *mp) /* file system mount structure */ | |
2201 | { | |
1421de38 | 2202 | mp->m_ag_maxlevels = xfs_btree_compute_maxlevels(mp->m_alloc_mnr, |
730e2a19 | 2203 | (mp->m_sb.sb_agblocks + 1) / 2); |
2bd0ea18 NS |
2204 | } |
2205 | ||
56b2de80 | 2206 | /* |
cf8ce220 DW |
2207 | * Find the length of the longest extent in an AG. The 'need' parameter |
2208 | * specifies how much space we're going to need for the AGFL and the | |
2209 | * 'reserved' parameter tells us how many blocks in this AG are reserved for | |
2210 | * other callers. | |
56b2de80 DC |
2211 | */ |
2212 | xfs_extlen_t | |
2213 | xfs_alloc_longest_free_extent( | |
72bda06d | 2214 | struct xfs_perag *pag, |
cf8ce220 DW |
2215 | xfs_extlen_t need, |
2216 | xfs_extlen_t reserved) | |
56b2de80 | 2217 | { |
72bda06d | 2218 | xfs_extlen_t delta = 0; |
56b2de80 | 2219 | |
cf8ce220 DW |
2220 | /* |
2221 | * If the AGFL needs a recharge, we'll have to subtract that from the | |
2222 | * longest extent. | |
2223 | */ | |
56b2de80 DC |
2224 | if (need > pag->pagf_flcount) |
2225 | delta = need - pag->pagf_flcount; | |
2226 | ||
cf8ce220 DW |
2227 | /* |
2228 | * If we cannot maintain others' reservations with space from the | |
2229 | * not-longest freesp extents, we'll have to subtract /that/ from | |
2230 | * the longest extent too. | |
2231 | */ | |
2232 | if (pag->pagf_freeblks - pag->pagf_longest < reserved) | |
2233 | delta += reserved - (pag->pagf_freeblks - pag->pagf_longest); | |
2234 | ||
2235 | /* | |
2236 | * If the longest extent is long enough to satisfy all the | |
2237 | * reservations and AGFL rules in place, we can return this extent. | |
2238 | */ | |
56b2de80 | 2239 | if (pag->pagf_longest > delta) |
14058d94 DC |
2240 | return min_t(xfs_extlen_t, pag->pag_mount->m_ag_max_usable, |
2241 | pag->pagf_longest - delta); | |
cf8ce220 DW |
2242 | |
2243 | /* Otherwise, let the caller try for 1 block if there's space. */ | |
56b2de80 DC |
2244 | return pag->pagf_flcount > 0 || pag->pagf_longest > 0; |
2245 | } | |
2246 | ||
b75bb1bd DW |
2247 | /* |
2248 | * Compute the minimum length of the AGFL in the given AG. If @pag is NULL, | |
2249 | * return the largest possible minimum length. | |
2250 | */ | |
de046644 DC |
2251 | unsigned int |
2252 | xfs_alloc_min_freelist( | |
2253 | struct xfs_mount *mp, | |
2254 | struct xfs_perag *pag) | |
2255 | { | |
b75bb1bd DW |
2256 | /* AG btrees have at least 1 level. */ |
2257 | static const uint8_t fake_levels[XFS_BTNUM_AGF] = {1, 1, 1}; | |
2258 | const uint8_t *levels = pag ? pag->pagf_levels : fake_levels; | |
de046644 DC |
2259 | unsigned int min_free; |
2260 | ||
b75bb1bd DW |
2261 | ASSERT(mp->m_ag_maxlevels > 0); |
2262 | ||
de046644 | 2263 | /* space needed by-bno freespace btree */ |
b75bb1bd | 2264 | min_free = min_t(unsigned int, levels[XFS_BTNUM_BNOi] + 1, |
de046644 DC |
2265 | mp->m_ag_maxlevels); |
2266 | /* space needed by-size freespace btree */ | |
b75bb1bd | 2267 | min_free += min_t(unsigned int, levels[XFS_BTNUM_CNTi] + 1, |
de046644 | 2268 | mp->m_ag_maxlevels); |
b8a8d6e5 DW |
2269 | /* space needed reverse mapping used space btree */ |
2270 | if (xfs_sb_version_hasrmapbt(&mp->m_sb)) | |
b75bb1bd DW |
2271 | min_free += min_t(unsigned int, levels[XFS_BTNUM_RMAPi] + 1, |
2272 | mp->m_rmap_maxlevels); | |
de046644 DC |
2273 | |
2274 | return min_free; | |
2275 | } | |
2276 | ||
5515b7c1 DC |
2277 | /* |
2278 | * Check if the operation we are fixing up the freelist for should go ahead or | |
2279 | * not. If we are freeing blocks, we always allow it, otherwise the allocation | |
2280 | * is dependent on whether the size and shape of free space available will | |
2281 | * permit the requested allocation to take place. | |
2282 | */ | |
2283 | static bool | |
2284 | xfs_alloc_space_available( | |
2285 | struct xfs_alloc_arg *args, | |
2286 | xfs_extlen_t min_free, | |
2287 | int flags) | |
2288 | { | |
2289 | struct xfs_perag *pag = args->pag; | |
3fe4a6dd | 2290 | xfs_extlen_t alloc_len, longest; |
cf8ce220 | 2291 | xfs_extlen_t reservation; /* blocks that are still reserved */ |
5515b7c1 | 2292 | int available; |
580a4380 | 2293 | xfs_extlen_t agflcount; |
5515b7c1 DC |
2294 | |
2295 | if (flags & XFS_ALLOC_FLAG_FREEING) | |
2296 | return true; | |
2297 | ||
cf8ce220 DW |
2298 | reservation = xfs_ag_resv_needed(pag, args->resv); |
2299 | ||
5515b7c1 | 2300 | /* do we have enough contiguous free space for the allocation? */ |
3fe4a6dd | 2301 | alloc_len = args->minlen + (args->alignment - 1) + args->minalignslop; |
1421de38 | 2302 | longest = xfs_alloc_longest_free_extent(pag, min_free, reservation); |
3fe4a6dd | 2303 | if (longest < alloc_len) |
5515b7c1 DC |
2304 | return false; |
2305 | ||
580a4380 BF |
2306 | /* |
2307 | * Do we have enough free space remaining for the allocation? Don't | |
2308 | * account extra agfl blocks because we are about to defer free them, | |
2309 | * making them unavailable until the current transaction commits. | |
2310 | */ | |
2311 | agflcount = min_t(xfs_extlen_t, pag->pagf_flcount, min_free); | |
2312 | available = (int)(pag->pagf_freeblks + agflcount - | |
2c003dc2 | 2313 | reservation - min_free - args->minleft); |
3fe4a6dd | 2314 | if (available < (int)max(args->total, alloc_len)) |
5515b7c1 DC |
2315 | return false; |
2316 | ||
2c003dc2 CH |
2317 | /* |
2318 | * Clamp maxlen to the amount of free space available for the actual | |
2319 | * extent allocation. | |
2320 | */ | |
2321 | if (available < (int)args->maxlen && !(flags & XFS_ALLOC_FLAG_CHECK)) { | |
2322 | args->maxlen = available; | |
2323 | ASSERT(args->maxlen > 0); | |
2324 | ASSERT(args->maxlen >= args->minlen); | |
2325 | } | |
2326 | ||
5515b7c1 DC |
2327 | return true; |
2328 | } | |
2329 | ||
30c8be8a BF |
2330 | int |
2331 | xfs_free_agfl_block( | |
2332 | struct xfs_trans *tp, | |
2333 | xfs_agnumber_t agno, | |
2334 | xfs_agblock_t agbno, | |
2335 | struct xfs_buf *agbp, | |
2336 | struct xfs_owner_info *oinfo) | |
2337 | { | |
2338 | int error; | |
2339 | struct xfs_buf *bp; | |
2340 | ||
2341 | error = xfs_free_ag_extent(tp, agbp, agno, agbno, 1, oinfo, | |
2342 | XFS_AG_RESV_AGFL); | |
2343 | if (error) | |
2344 | return error; | |
2345 | ||
78fcd346 DW |
2346 | error = xfs_trans_get_buf(tp, tp->t_mountp->m_ddev_targp, |
2347 | XFS_AGB_TO_DADDR(tp->t_mountp, agno, agbno), | |
2348 | tp->t_mountp->m_bsize, 0, &bp); | |
2349 | if (error) | |
2350 | return error; | |
30c8be8a BF |
2351 | xfs_trans_binval(tp, bp); |
2352 | ||
2353 | return 0; | |
2354 | } | |
2355 | ||
8dbee8f5 BF |
2356 | /* |
2357 | * Check the agfl fields of the agf for inconsistency or corruption. The purpose | |
2358 | * is to detect an agfl header padding mismatch between current and early v5 | |
2359 | * kernels. This problem manifests as a 1-slot size difference between the | |
2360 | * on-disk flcount and the active [first, last] range of a wrapped agfl. This | |
2361 | * may also catch variants of agfl count corruption unrelated to padding. Either | |
2362 | * way, we'll reset the agfl and warn the user. | |
2363 | * | |
2364 | * Return true if a reset is required before the agfl can be used, false | |
2365 | * otherwise. | |
2366 | */ | |
2367 | static bool | |
2368 | xfs_agfl_needs_reset( | |
2369 | struct xfs_mount *mp, | |
2370 | struct xfs_agf *agf) | |
2371 | { | |
2372 | uint32_t f = be32_to_cpu(agf->agf_flfirst); | |
2373 | uint32_t l = be32_to_cpu(agf->agf_fllast); | |
2374 | uint32_t c = be32_to_cpu(agf->agf_flcount); | |
2375 | int agfl_size = xfs_agfl_size(mp); | |
2376 | int active; | |
2377 | ||
2378 | /* no agfl header on v4 supers */ | |
2379 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
2380 | return false; | |
2381 | ||
2382 | /* | |
2383 | * The agf read verifier catches severe corruption of these fields. | |
2384 | * Repeat some sanity checks to cover a packed -> unpacked mismatch if | |
2385 | * the verifier allows it. | |
2386 | */ | |
2387 | if (f >= agfl_size || l >= agfl_size) | |
2388 | return true; | |
2389 | if (c > agfl_size) | |
2390 | return true; | |
2391 | ||
2392 | /* | |
2393 | * Check consistency between the on-disk count and the active range. An | |
2394 | * agfl padding mismatch manifests as an inconsistent flcount. | |
2395 | */ | |
2396 | if (c && l >= f) | |
2397 | active = l - f + 1; | |
2398 | else if (c) | |
2399 | active = agfl_size - f + l + 1; | |
2400 | else | |
2401 | active = 0; | |
2402 | ||
2403 | return active != c; | |
2404 | } | |
2405 | ||
2406 | /* | |
2407 | * Reset the agfl to an empty state. Ignore/drop any existing blocks since the | |
2408 | * agfl content cannot be trusted. Warn the user that a repair is required to | |
2409 | * recover leaked blocks. | |
2410 | * | |
2411 | * The purpose of this mechanism is to handle filesystems affected by the agfl | |
2412 | * header padding mismatch problem. A reset keeps the filesystem online with a | |
2413 | * relatively minor free space accounting inconsistency rather than suffer the | |
2414 | * inevitable crash from use of an invalid agfl block. | |
2415 | */ | |
2416 | static void | |
2417 | xfs_agfl_reset( | |
2418 | struct xfs_trans *tp, | |
2419 | struct xfs_buf *agbp, | |
2420 | struct xfs_perag *pag) | |
2421 | { | |
2422 | struct xfs_mount *mp = tp->t_mountp; | |
2423 | struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); | |
2424 | ||
2425 | ASSERT(pag->pagf_agflreset); | |
2426 | trace_xfs_agfl_reset(mp, agf, 0, _RET_IP_); | |
2427 | ||
2428 | xfs_warn(mp, | |
2429 | "WARNING: Reset corrupted AGFL on AG %u. %d blocks leaked. " | |
2430 | "Please unmount and run xfs_repair.", | |
2431 | pag->pag_agno, pag->pagf_flcount); | |
2432 | ||
2433 | agf->agf_flfirst = 0; | |
2434 | agf->agf_fllast = cpu_to_be32(xfs_agfl_size(mp) - 1); | |
2435 | agf->agf_flcount = 0; | |
2436 | xfs_alloc_log_agf(tp, agbp, XFS_AGF_FLFIRST | XFS_AGF_FLLAST | | |
2437 | XFS_AGF_FLCOUNT); | |
2438 | ||
2439 | pag->pagf_flcount = 0; | |
2440 | pag->pagf_agflreset = false; | |
2441 | } | |
2442 | ||
d5c1b462 BF |
2443 | /* |
2444 | * Defer an AGFL block free. This is effectively equivalent to | |
2445 | * xfs_bmap_add_free() with some special handling particular to AGFL blocks. | |
2446 | * | |
2447 | * Deferring AGFL frees helps prevent log reservation overruns due to too many | |
2448 | * allocation operations in a transaction. AGFL frees are prone to this problem | |
2449 | * because for one they are always freed one at a time. Further, an immediate | |
2450 | * AGFL block free can cause a btree join and require another block free before | |
2451 | * the real allocation can proceed. Deferring the free disconnects freeing up | |
2452 | * the AGFL slot from freeing the block. | |
2453 | */ | |
2454 | STATIC void | |
2455 | xfs_defer_agfl_block( | |
21375e5d | 2456 | struct xfs_trans *tp, |
d5c1b462 BF |
2457 | xfs_agnumber_t agno, |
2458 | xfs_fsblock_t agbno, | |
2459 | struct xfs_owner_info *oinfo) | |
2460 | { | |
21375e5d | 2461 | struct xfs_mount *mp = tp->t_mountp; |
d5c1b462 BF |
2462 | struct xfs_extent_free_item *new; /* new element */ |
2463 | ||
2464 | ASSERT(xfs_bmap_free_item_zone != NULL); | |
2465 | ASSERT(oinfo != NULL); | |
2466 | ||
6cd1e6db | 2467 | new = kmem_zone_alloc(xfs_bmap_free_item_zone, 0); |
d5c1b462 BF |
2468 | new->xefi_startblock = XFS_AGB_TO_FSB(mp, agno, agbno); |
2469 | new->xefi_blockcount = 1; | |
2470 | new->xefi_oinfo = *oinfo; | |
2471 | ||
2472 | trace_xfs_agfl_free_defer(mp, agno, 0, agbno, 1); | |
2473 | ||
21375e5d | 2474 | xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_AGFL_FREE, &new->xefi_list); |
d5c1b462 BF |
2475 | } |
2476 | ||
2bd0ea18 NS |
2477 | /* |
2478 | * Decide whether to use this allocation group for this allocation. | |
2479 | * If so, fix up the btree freelist's size. | |
2bd0ea18 | 2480 | */ |
ff105f75 | 2481 | int /* error */ |
2bd0ea18 | 2482 | xfs_alloc_fix_freelist( |
c98e644e DC |
2483 | struct xfs_alloc_arg *args, /* allocation argument structure */ |
2484 | int flags) /* XFS_ALLOC_FLAG_... */ | |
2bd0ea18 | 2485 | { |
c98e644e DC |
2486 | struct xfs_mount *mp = args->mp; |
2487 | struct xfs_perag *pag = args->pag; | |
2488 | struct xfs_trans *tp = args->tp; | |
2489 | struct xfs_buf *agbp = NULL; | |
2490 | struct xfs_buf *agflbp = NULL; | |
2491 | struct xfs_alloc_arg targs; /* local allocation arguments */ | |
2492 | xfs_agblock_t bno; /* freelist block */ | |
2493 | xfs_extlen_t need; /* total blocks needed in freelist */ | |
fcdd428c | 2494 | int error = 0; |
c98e644e | 2495 | |
d85d3424 BF |
2496 | /* deferred ops (AGFL block frees) require permanent transactions */ |
2497 | ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); | |
2498 | ||
2bd0ea18 | 2499 | if (!pag->pagf_init) { |
c98e644e DC |
2500 | error = xfs_alloc_read_agf(mp, tp, args->agno, flags, &agbp); |
2501 | if (error) | |
2502 | goto out_no_agbp; | |
2bd0ea18 | 2503 | if (!pag->pagf_init) { |
5e656dbb BN |
2504 | ASSERT(flags & XFS_ALLOC_FLAG_TRYLOCK); |
2505 | ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); | |
c98e644e | 2506 | goto out_agbp_relse; |
2bd0ea18 | 2507 | } |
c98e644e | 2508 | } |
34317449 | 2509 | |
5e656dbb | 2510 | /* |
c98e644e DC |
2511 | * If this is a metadata preferred pag and we are user data then try |
2512 | * somewhere else if we are not being asked to try harder at this | |
2513 | * point | |
34317449 | 2514 | */ |
a85522b6 | 2515 | if (pag->pagf_metadata && (args->datatype & XFS_ALLOC_USERDATA) && |
5e656dbb BN |
2516 | (flags & XFS_ALLOC_FLAG_TRYLOCK)) { |
2517 | ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); | |
c98e644e | 2518 | goto out_agbp_relse; |
34317449 NS |
2519 | } |
2520 | ||
de046644 | 2521 | need = xfs_alloc_min_freelist(mp, pag); |
2c003dc2 CH |
2522 | if (!xfs_alloc_space_available(args, need, flags | |
2523 | XFS_ALLOC_FLAG_CHECK)) | |
c98e644e | 2524 | goto out_agbp_relse; |
5e656dbb | 2525 | |
2bd0ea18 NS |
2526 | /* |
2527 | * Get the a.g. freespace buffer. | |
2528 | * Can fail if we're not blocking on locks, and it's held. | |
2529 | */ | |
c98e644e DC |
2530 | if (!agbp) { |
2531 | error = xfs_alloc_read_agf(mp, tp, args->agno, flags, &agbp); | |
2532 | if (error) | |
2533 | goto out_no_agbp; | |
2534 | if (!agbp) { | |
5e656dbb BN |
2535 | ASSERT(flags & XFS_ALLOC_FLAG_TRYLOCK); |
2536 | ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); | |
c98e644e | 2537 | goto out_no_agbp; |
2bd0ea18 NS |
2538 | } |
2539 | } | |
72bda06d | 2540 | |
8dbee8f5 BF |
2541 | /* reset a padding mismatched agfl before final free space check */ |
2542 | if (pag->pagf_agflreset) | |
2543 | xfs_agfl_reset(tp, agbp, pag); | |
2544 | ||
72bda06d | 2545 | /* If there isn't enough total space or single-extent, reject it. */ |
de046644 | 2546 | need = xfs_alloc_min_freelist(mp, pag); |
c98e644e DC |
2547 | if (!xfs_alloc_space_available(args, need, flags)) |
2548 | goto out_agbp_relse; | |
5515b7c1 | 2549 | |
2bd0ea18 NS |
2550 | /* |
2551 | * Make the freelist shorter if it's too long. | |
72bda06d | 2552 | * |
c98e644e DC |
2553 | * Note that from this point onwards, we will always release the agf and |
2554 | * agfl buffers on error. This handles the case where we error out and | |
2555 | * the buffers are clean or may not have been joined to the transaction | |
2556 | * and hence need to be released manually. If they have been joined to | |
2557 | * the transaction, then xfs_trans_brelse() will handle them | |
2558 | * appropriately based on the recursion count and dirty state of the | |
2559 | * buffer. | |
2560 | * | |
72bda06d DC |
2561 | * XXX (dgc): When we have lots of free space, does this buy us |
2562 | * anything other than extra overhead when we need to put more blocks | |
2563 | * back on the free list? Maybe we should only do this when space is | |
2564 | * getting low or the AGFL is more than half full? | |
e365af6f DW |
2565 | * |
2566 | * The NOSHRINK flag prevents the AGFL from being shrunk if it's too | |
2567 | * big; the NORMAP flag prevents AGFL expand/shrink operations from | |
2568 | * updating the rmapbt. Both flags are used in xfs_repair while we're | |
2569 | * rebuilding the rmapbt, and neither are used by the kernel. They're | |
2570 | * both required to ensure that rmaps are correctly recorded for the | |
2571 | * regenerated AGFL, bnobt, and cntbt. See repair/phase5.c and | |
2572 | * repair/rmap.c in xfsprogs for details. | |
2bd0ea18 | 2573 | */ |
e365af6f | 2574 | memset(&targs, 0, sizeof(targs)); |
007347e3 | 2575 | /* struct copy below */ |
e365af6f | 2576 | if (flags & XFS_ALLOC_FLAG_NORMAP) |
007347e3 | 2577 | targs.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE; |
e365af6f | 2578 | else |
007347e3 | 2579 | targs.oinfo = XFS_RMAP_OINFO_AG; |
e365af6f | 2580 | while (!(flags & XFS_ALLOC_FLAG_NOSHRINK) && pag->pagf_flcount > need) { |
5e656dbb BN |
2581 | error = xfs_alloc_get_freelist(tp, agbp, &bno, 0); |
2582 | if (error) | |
c98e644e | 2583 | goto out_agbp_relse; |
30c8be8a | 2584 | |
6dc24128 BF |
2585 | /* defer agfl frees */ |
2586 | xfs_defer_agfl_block(tp, args->agno, bno, &targs.oinfo); | |
2bd0ea18 | 2587 | } |
72bda06d | 2588 | |
2bd0ea18 NS |
2589 | targs.tp = tp; |
2590 | targs.mp = mp; | |
2591 | targs.agbp = agbp; | |
2592 | targs.agno = args->agno; | |
cf8ce220 | 2593 | targs.alignment = targs.minlen = targs.prod = 1; |
2bd0ea18 NS |
2594 | targs.type = XFS_ALLOCTYPE_THIS_AG; |
2595 | targs.pag = pag; | |
72bda06d DC |
2596 | error = xfs_alloc_read_agfl(mp, tp, targs.agno, &agflbp); |
2597 | if (error) | |
c98e644e | 2598 | goto out_agbp_relse; |
72bda06d DC |
2599 | |
2600 | /* Make the freelist longer if it's too short. */ | |
2601 | while (pag->pagf_flcount < need) { | |
2bd0ea18 | 2602 | targs.agbno = 0; |
72bda06d | 2603 | targs.maxlen = need - pag->pagf_flcount; |
9760cac2 | 2604 | targs.resv = XFS_AG_RESV_AGFL; |
72bda06d DC |
2605 | |
2606 | /* Allocate as many blocks as possible at once. */ | |
2607 | error = xfs_alloc_ag_vextent(&targs); | |
c98e644e DC |
2608 | if (error) |
2609 | goto out_agflbp_relse; | |
2610 | ||
2bd0ea18 | 2611 | /* |
dfc130f3 RC |
2612 | * Stop if we run out. Won't happen if callers are obeying |
2613 | * the restrictions correctly. Can happen for free calls | |
2bd0ea18 NS |
2614 | * on a completely full ag. |
2615 | */ | |
5e656dbb BN |
2616 | if (targs.agbno == NULLAGBLOCK) { |
2617 | if (flags & XFS_ALLOC_FLAG_FREEING) | |
2618 | break; | |
c98e644e | 2619 | goto out_agflbp_relse; |
5e656dbb | 2620 | } |
2bd0ea18 NS |
2621 | /* |
2622 | * Put each allocated block on the list. | |
2623 | */ | |
2624 | for (bno = targs.agbno; bno < targs.agbno + targs.len; bno++) { | |
5e656dbb BN |
2625 | error = xfs_alloc_put_freelist(tp, agbp, |
2626 | agflbp, bno, 0); | |
2627 | if (error) | |
c98e644e | 2628 | goto out_agflbp_relse; |
2bd0ea18 NS |
2629 | } |
2630 | } | |
cb4deb22 | 2631 | xfs_trans_brelse(tp, agflbp); |
2bd0ea18 NS |
2632 | args->agbp = agbp; |
2633 | return 0; | |
c98e644e DC |
2634 | |
2635 | out_agflbp_relse: | |
2636 | xfs_trans_brelse(tp, agflbp); | |
2637 | out_agbp_relse: | |
2638 | if (agbp) | |
2639 | xfs_trans_brelse(tp, agbp); | |
2640 | out_no_agbp: | |
2641 | args->agbp = NULL; | |
2642 | return error; | |
2bd0ea18 NS |
2643 | } |
2644 | ||
2645 | /* | |
2646 | * Get a block from the freelist. | |
2647 | * Returns with the buffer for the block gotten. | |
2648 | */ | |
2649 | int /* error */ | |
2650 | xfs_alloc_get_freelist( | |
2651 | xfs_trans_t *tp, /* transaction pointer */ | |
2652 | xfs_buf_t *agbp, /* buffer containing the agf structure */ | |
cdded3d8 DC |
2653 | xfs_agblock_t *bnop, /* block address retrieved from freelist */ |
2654 | int btreeblk) /* destination is a AGF btree */ | |
2bd0ea18 NS |
2655 | { |
2656 | xfs_agf_t *agf; /* a.g. freespace structure */ | |
2bd0ea18 NS |
2657 | xfs_buf_t *agflbp;/* buffer for a.g. freelist structure */ |
2658 | xfs_agblock_t bno; /* block number returned */ | |
dd5b876e | 2659 | __be32 *agfl_bno; |
2bd0ea18 | 2660 | int error; |
cdded3d8 | 2661 | int logflags; |
dd5b876e | 2662 | xfs_mount_t *mp = tp->t_mountp; |
2bd0ea18 NS |
2663 | xfs_perag_t *pag; /* per allocation group data */ |
2664 | ||
2bd0ea18 NS |
2665 | /* |
2666 | * Freelist is empty, give up. | |
2667 | */ | |
dd5b876e | 2668 | agf = XFS_BUF_TO_AGF(agbp); |
46eca962 | 2669 | if (!agf->agf_flcount) { |
2bd0ea18 NS |
2670 | *bnop = NULLAGBLOCK; |
2671 | return 0; | |
2672 | } | |
2673 | /* | |
2674 | * Read the array of free blocks. | |
2675 | */ | |
dd5b876e DC |
2676 | error = xfs_alloc_read_agfl(mp, tp, be32_to_cpu(agf->agf_seqno), |
2677 | &agflbp); | |
2678 | if (error) | |
2bd0ea18 | 2679 | return error; |
dd5b876e DC |
2680 | |
2681 | ||
2bd0ea18 NS |
2682 | /* |
2683 | * Get the block number and update the data structures. | |
2684 | */ | |
dd5b876e DC |
2685 | agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp); |
2686 | bno = be32_to_cpu(agfl_bno[be32_to_cpu(agf->agf_flfirst)]); | |
5e656dbb | 2687 | be32_add_cpu(&agf->agf_flfirst, 1); |
2bd0ea18 | 2688 | xfs_trans_brelse(tp, agflbp); |
b8165508 | 2689 | if (be32_to_cpu(agf->agf_flfirst) == xfs_agfl_size(mp)) |
46eca962 | 2690 | agf->agf_flfirst = 0; |
56b2de80 DC |
2691 | |
2692 | pag = xfs_perag_get(mp, be32_to_cpu(agf->agf_seqno)); | |
8dbee8f5 | 2693 | ASSERT(!pag->pagf_agflreset); |
5e656dbb | 2694 | be32_add_cpu(&agf->agf_flcount, -1); |
2bd0ea18 NS |
2695 | xfs_trans_agflist_delta(tp, -1); |
2696 | pag->pagf_flcount--; | |
cdded3d8 DC |
2697 | |
2698 | logflags = XFS_AGF_FLFIRST | XFS_AGF_FLCOUNT; | |
2699 | if (btreeblk) { | |
5e656dbb | 2700 | be32_add_cpu(&agf->agf_btreeblks, 1); |
cdded3d8 DC |
2701 | pag->pagf_btreeblks++; |
2702 | logflags |= XFS_AGF_BTREEBLKS; | |
2703 | } | |
8648192f | 2704 | xfs_perag_put(pag); |
cdded3d8 | 2705 | |
cdded3d8 | 2706 | xfs_alloc_log_agf(tp, agbp, logflags); |
2bd0ea18 | 2707 | *bnop = bno; |
3e535bba | 2708 | |
2bd0ea18 NS |
2709 | return 0; |
2710 | } | |
2711 | ||
2712 | /* | |
2713 | * Log the given fields from the agf structure. | |
2714 | */ | |
2715 | void | |
2716 | xfs_alloc_log_agf( | |
2717 | xfs_trans_t *tp, /* transaction pointer */ | |
2718 | xfs_buf_t *bp, /* buffer for a.g. freelist header */ | |
dfc130f3 | 2719 | int fields) /* mask of fields to be logged (XFS_AGF_...) */ |
2bd0ea18 NS |
2720 | { |
2721 | int first; /* first byte offset */ | |
2722 | int last; /* last byte offset */ | |
2723 | static const short offsets[] = { | |
2724 | offsetof(xfs_agf_t, agf_magicnum), | |
2725 | offsetof(xfs_agf_t, agf_versionnum), | |
2726 | offsetof(xfs_agf_t, agf_seqno), | |
2727 | offsetof(xfs_agf_t, agf_length), | |
2728 | offsetof(xfs_agf_t, agf_roots[0]), | |
2729 | offsetof(xfs_agf_t, agf_levels[0]), | |
2730 | offsetof(xfs_agf_t, agf_flfirst), | |
2731 | offsetof(xfs_agf_t, agf_fllast), | |
2732 | offsetof(xfs_agf_t, agf_flcount), | |
2733 | offsetof(xfs_agf_t, agf_freeblks), | |
2734 | offsetof(xfs_agf_t, agf_longest), | |
cdded3d8 | 2735 | offsetof(xfs_agf_t, agf_btreeblks), |
dd5b876e | 2736 | offsetof(xfs_agf_t, agf_uuid), |
8511b71a | 2737 | offsetof(xfs_agf_t, agf_rmap_blocks), |
bc859611 DW |
2738 | offsetof(xfs_agf_t, agf_refcount_blocks), |
2739 | offsetof(xfs_agf_t, agf_refcount_root), | |
2740 | offsetof(xfs_agf_t, agf_refcount_level), | |
8511b71a DW |
2741 | /* needed so that we don't log the whole rest of the structure: */ |
2742 | offsetof(xfs_agf_t, agf_spare64), | |
2bd0ea18 NS |
2743 | sizeof(xfs_agf_t) |
2744 | }; | |
2745 | ||
56b2de80 DC |
2746 | trace_xfs_agf(tp->t_mountp, XFS_BUF_TO_AGF(bp), fields, _RET_IP_); |
2747 | ||
bdc16ee5 | 2748 | xfs_trans_buf_set_type(tp, bp, XFS_BLFT_AGF_BUF); |
dd5b876e | 2749 | |
2bd0ea18 NS |
2750 | xfs_btree_offsets(fields, offsets, XFS_AGF_NUM_BITS, &first, &last); |
2751 | xfs_trans_log_buf(tp, bp, (uint)first, (uint)last); | |
2752 | } | |
2753 | ||
2754 | /* | |
2755 | * Interface for inode allocation to force the pag data to be initialized. | |
2756 | */ | |
2757 | int /* error */ | |
2758 | xfs_alloc_pagf_init( | |
2759 | xfs_mount_t *mp, /* file system mount structure */ | |
2760 | xfs_trans_t *tp, /* transaction pointer */ | |
2761 | xfs_agnumber_t agno, /* allocation group number */ | |
2762 | int flags) /* XFS_ALLOC_FLAGS_... */ | |
2763 | { | |
7a3bffe4 | 2764 | xfs_buf_t *bp; |
2bd0ea18 NS |
2765 | int error; |
2766 | ||
0e266570 | 2767 | if ((error = xfs_alloc_read_agf(mp, tp, agno, flags, &bp))) |
2bd0ea18 NS |
2768 | return error; |
2769 | if (bp) | |
2770 | xfs_trans_brelse(tp, bp); | |
2771 | return 0; | |
2772 | } | |
2773 | ||
2774 | /* | |
2775 | * Put the block on the freelist for the allocation group. | |
2776 | */ | |
2777 | int /* error */ | |
2778 | xfs_alloc_put_freelist( | |
2779 | xfs_trans_t *tp, /* transaction pointer */ | |
2780 | xfs_buf_t *agbp, /* buffer for a.g. freelist header */ | |
2781 | xfs_buf_t *agflbp,/* buffer for a.g. free block array */ | |
cdded3d8 DC |
2782 | xfs_agblock_t bno, /* block being freed */ |
2783 | int btreeblk) /* block came from a AGF btree */ | |
2bd0ea18 NS |
2784 | { |
2785 | xfs_agf_t *agf; /* a.g. freespace structure */ | |
5e656dbb | 2786 | __be32 *blockp;/* pointer to array entry */ |
2bd0ea18 | 2787 | int error; |
cdded3d8 | 2788 | int logflags; |
2bd0ea18 NS |
2789 | xfs_mount_t *mp; /* mount structure */ |
2790 | xfs_perag_t *pag; /* per allocation group data */ | |
dd5b876e DC |
2791 | __be32 *agfl_bno; |
2792 | int startoff; | |
2bd0ea18 NS |
2793 | |
2794 | agf = XFS_BUF_TO_AGF(agbp); | |
2795 | mp = tp->t_mountp; | |
2796 | ||
2797 | if (!agflbp && (error = xfs_alloc_read_agfl(mp, tp, | |
6e3140c7 | 2798 | be32_to_cpu(agf->agf_seqno), &agflbp))) |
2bd0ea18 | 2799 | return error; |
5e656dbb | 2800 | be32_add_cpu(&agf->agf_fllast, 1); |
b8165508 | 2801 | if (be32_to_cpu(agf->agf_fllast) == xfs_agfl_size(mp)) |
46eca962 | 2802 | agf->agf_fllast = 0; |
56b2de80 DC |
2803 | |
2804 | pag = xfs_perag_get(mp, be32_to_cpu(agf->agf_seqno)); | |
8dbee8f5 | 2805 | ASSERT(!pag->pagf_agflreset); |
5e656dbb | 2806 | be32_add_cpu(&agf->agf_flcount, 1); |
2bd0ea18 NS |
2807 | xfs_trans_agflist_delta(tp, 1); |
2808 | pag->pagf_flcount++; | |
cdded3d8 DC |
2809 | |
2810 | logflags = XFS_AGF_FLLAST | XFS_AGF_FLCOUNT; | |
2811 | if (btreeblk) { | |
5e656dbb | 2812 | be32_add_cpu(&agf->agf_btreeblks, -1); |
cdded3d8 DC |
2813 | pag->pagf_btreeblks--; |
2814 | logflags |= XFS_AGF_BTREEBLKS; | |
2815 | } | |
56b2de80 | 2816 | xfs_perag_put(pag); |
cdded3d8 | 2817 | |
5e656dbb BN |
2818 | xfs_alloc_log_agf(tp, agbp, logflags); |
2819 | ||
b8165508 | 2820 | ASSERT(be32_to_cpu(agf->agf_flcount) <= xfs_agfl_size(mp)); |
dd5b876e DC |
2821 | |
2822 | agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp); | |
2823 | blockp = &agfl_bno[be32_to_cpu(agf->agf_fllast)]; | |
5e656dbb | 2824 | *blockp = cpu_to_be32(bno); |
dd5b876e DC |
2825 | startoff = (char *)blockp - (char *)agflbp->b_addr; |
2826 | ||
cdded3d8 | 2827 | xfs_alloc_log_agf(tp, agbp, logflags); |
dd5b876e | 2828 | |
bdc16ee5 | 2829 | xfs_trans_buf_set_type(tp, agflbp, XFS_BLFT_AGFL_BUF); |
dd5b876e DC |
2830 | xfs_trans_log_buf(tp, agflbp, startoff, |
2831 | startoff + sizeof(xfs_agblock_t) - 1); | |
2bd0ea18 NS |
2832 | return 0; |
2833 | } | |
2834 | ||
bc01119d | 2835 | static xfs_failaddr_t |
a2ceac1f | 2836 | xfs_agf_verify( |
95d9582b DW |
2837 | struct xfs_buf *bp) |
2838 | { | |
7861ef77 | 2839 | struct xfs_mount *mp = bp->b_mount; |
95d9582b | 2840 | struct xfs_agf *agf = XFS_BUF_TO_AGF(bp); |
a2ceac1f | 2841 | |
a65d8d29 BF |
2842 | if (xfs_sb_version_hascrc(&mp->m_sb)) { |
2843 | if (!uuid_equal(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid)) | |
bc01119d | 2844 | return __this_address; |
a65d8d29 BF |
2845 | if (!xfs_log_check_lsn(mp, |
2846 | be64_to_cpu(XFS_BUF_TO_AGF(bp)->agf_lsn))) | |
bc01119d | 2847 | return __this_address; |
a65d8d29 | 2848 | } |
a2ceac1f | 2849 | |
68dbe77f BF |
2850 | if (!xfs_verify_magic(bp, agf->agf_magicnum)) |
2851 | return __this_address; | |
2852 | ||
2853 | if (!(XFS_AGF_GOOD_VERSION(be32_to_cpu(agf->agf_versionnum)) && | |
dd5b876e | 2854 | be32_to_cpu(agf->agf_freeblks) <= be32_to_cpu(agf->agf_length) && |
b8165508 DC |
2855 | be32_to_cpu(agf->agf_flfirst) < xfs_agfl_size(mp) && |
2856 | be32_to_cpu(agf->agf_fllast) < xfs_agfl_size(mp) && | |
2857 | be32_to_cpu(agf->agf_flcount) <= xfs_agfl_size(mp))) | |
bc01119d | 2858 | return __this_address; |
a2ceac1f | 2859 | |
00795aae DW |
2860 | if (be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]) < 1 || |
2861 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]) < 1 || | |
2862 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]) > XFS_BTREE_MAXLEVELS || | |
5a35bf2c | 2863 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]) > XFS_BTREE_MAXLEVELS) |
bc01119d | 2864 | return __this_address; |
5a35bf2c | 2865 | |
e37838e5 | 2866 | if (xfs_sb_version_hasrmapbt(&mp->m_sb) && |
00795aae DW |
2867 | (be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]) < 1 || |
2868 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]) > XFS_BTREE_MAXLEVELS)) | |
bc01119d | 2869 | return __this_address; |
e37838e5 | 2870 | |
a2ceac1f DC |
2871 | /* |
2872 | * during growfs operations, the perag is not fully initialised, | |
2873 | * so we can't use it for any useful checking. growfs ensures we can't | |
2874 | * use it by using uncached buffers that don't have the perag attached | |
2875 | * so we can detect and avoid this problem. | |
2876 | */ | |
dd5b876e | 2877 | if (bp->b_pag && be32_to_cpu(agf->agf_seqno) != bp->b_pag->pag_agno) |
bc01119d | 2878 | return __this_address; |
a2ceac1f | 2879 | |
dd5b876e DC |
2880 | if (xfs_sb_version_haslazysbcount(&mp->m_sb) && |
2881 | be32_to_cpu(agf->agf_btreeblks) > be32_to_cpu(agf->agf_length)) | |
bc01119d | 2882 | return __this_address; |
dd5b876e | 2883 | |
88ce0792 | 2884 | if (xfs_sb_version_hasreflink(&mp->m_sb) && |
00795aae DW |
2885 | (be32_to_cpu(agf->agf_refcount_level) < 1 || |
2886 | be32_to_cpu(agf->agf_refcount_level) > XFS_BTREE_MAXLEVELS)) | |
bc01119d | 2887 | return __this_address; |
88ce0792 | 2888 | |
bc01119d | 2889 | return NULL; |
a2ceac1f | 2890 | |
a2ceac1f DC |
2891 | } |
2892 | ||
2893 | static void | |
2894 | xfs_agf_read_verify( | |
2895 | struct xfs_buf *bp) | |
2896 | { | |
7861ef77 | 2897 | struct xfs_mount *mp = bp->b_mount; |
1e697959 | 2898 | xfs_failaddr_t fa; |
dd5b876e | 2899 | |
45922933 DC |
2900 | if (xfs_sb_version_hascrc(&mp->m_sb) && |
2901 | !xfs_buf_verify_cksum(bp, XFS_AGF_CRC_OFF)) | |
1e697959 DW |
2902 | xfs_verifier_error(bp, -EFSBADCRC, __this_address); |
2903 | else { | |
95d9582b | 2904 | fa = xfs_agf_verify(bp); |
1e697959 DW |
2905 | if (XFS_TEST_ERROR(fa, mp, XFS_ERRTAG_ALLOC_READ_AGF)) |
2906 | xfs_verifier_error(bp, -EFSCORRUPTED, fa); | |
2907 | } | |
a2ceac1f DC |
2908 | } |
2909 | ||
2910 | static void | |
2911 | xfs_agf_write_verify( | |
2912 | struct xfs_buf *bp) | |
2913 | { | |
7861ef77 | 2914 | struct xfs_mount *mp = bp->b_mount; |
37d086ca | 2915 | struct xfs_buf_log_item *bip = bp->b_log_item; |
1e697959 | 2916 | xfs_failaddr_t fa; |
dd5b876e | 2917 | |
95d9582b | 2918 | fa = xfs_agf_verify(bp); |
1e697959 DW |
2919 | if (fa) { |
2920 | xfs_verifier_error(bp, -EFSCORRUPTED, fa); | |
dd5b876e DC |
2921 | return; |
2922 | } | |
2923 | ||
2924 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
2925 | return; | |
2926 | ||
2927 | if (bip) | |
2928 | XFS_BUF_TO_AGF(bp)->agf_lsn = cpu_to_be64(bip->bli_item.li_lsn); | |
2929 | ||
43b5aeed | 2930 | xfs_buf_update_cksum(bp, XFS_AGF_CRC_OFF); |
a2ceac1f DC |
2931 | } |
2932 | ||
2933 | const struct xfs_buf_ops xfs_agf_buf_ops = { | |
a3fac935 | 2934 | .name = "xfs_agf", |
68dbe77f | 2935 | .magic = { cpu_to_be32(XFS_AGF_MAGIC), cpu_to_be32(XFS_AGF_MAGIC) }, |
a2ceac1f DC |
2936 | .verify_read = xfs_agf_read_verify, |
2937 | .verify_write = xfs_agf_write_verify, | |
95d9582b | 2938 | .verify_struct = xfs_agf_verify, |
a2ceac1f DC |
2939 | }; |
2940 | ||
2bd0ea18 NS |
2941 | /* |
2942 | * Read in the allocation group header (free/alloc section). | |
2943 | */ | |
2944 | int /* error */ | |
56b2de80 DC |
2945 | xfs_read_agf( |
2946 | struct xfs_mount *mp, /* mount point structure */ | |
2947 | struct xfs_trans *tp, /* transaction pointer */ | |
2948 | xfs_agnumber_t agno, /* allocation group number */ | |
2949 | int flags, /* XFS_BUF_ */ | |
2950 | struct xfs_buf **bpp) /* buffer for the ag freelist header */ | |
2bd0ea18 | 2951 | { |
9440d84d | 2952 | int error; |
2bd0ea18 | 2953 | |
ff105f75 DC |
2954 | trace_xfs_read_agf(mp, agno); |
2955 | ||
2bd0ea18 | 2956 | ASSERT(agno != NULLAGNUMBER); |
3e6069a1 | 2957 | error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, |
9440d84d | 2958 | XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), |
a2ceac1f | 2959 | XFS_FSS_TO_BB(mp, 1), flags, bpp, &xfs_agf_buf_ops); |
3e6069a1 DW |
2960 | /* |
2961 | * Callers of xfs_read_agf() currently interpret a NULL bpp as EAGAIN | |
2962 | * and need to be converted to check for EAGAIN specifically. | |
2963 | */ | |
2964 | if (error == -EAGAIN) | |
2965 | return 0; | |
9440d84d | 2966 | if (error) |
2bd0ea18 | 2967 | return error; |
56b2de80 | 2968 | |
a2ceac1f DC |
2969 | ASSERT(!(*bpp)->b_error); |
2970 | xfs_buf_set_ref(*bpp, XFS_AGF_REF); | |
56b2de80 DC |
2971 | return 0; |
2972 | } | |
2973 | ||
2974 | /* | |
2975 | * Read in the allocation group header (free/alloc section). | |
2976 | */ | |
2977 | int /* error */ | |
2978 | xfs_alloc_read_agf( | |
2979 | struct xfs_mount *mp, /* mount point structure */ | |
2980 | struct xfs_trans *tp, /* transaction pointer */ | |
2981 | xfs_agnumber_t agno, /* allocation group number */ | |
2982 | int flags, /* XFS_ALLOC_FLAG_... */ | |
2983 | struct xfs_buf **bpp) /* buffer for the ag freelist header */ | |
2984 | { | |
2985 | struct xfs_agf *agf; /* ag freelist header */ | |
2986 | struct xfs_perag *pag; /* per allocation group data */ | |
2987 | int error; | |
2988 | ||
ff105f75 | 2989 | trace_xfs_alloc_read_agf(mp, agno); |
56b2de80 | 2990 | |
ff105f75 | 2991 | ASSERT(agno != NULLAGNUMBER); |
56b2de80 DC |
2992 | error = xfs_read_agf(mp, tp, agno, |
2993 | (flags & XFS_ALLOC_FLAG_TRYLOCK) ? XBF_TRYLOCK : 0, | |
2994 | bpp); | |
2995 | if (error) | |
2996 | return error; | |
2997 | if (!*bpp) | |
2998 | return 0; | |
a2ceac1f | 2999 | ASSERT(!(*bpp)->b_error); |
56b2de80 DC |
3000 | |
3001 | agf = XFS_BUF_TO_AGF(*bpp); | |
3002 | pag = xfs_perag_get(mp, agno); | |
2bd0ea18 | 3003 | if (!pag->pagf_init) { |
6e3140c7 | 3004 | pag->pagf_freeblks = be32_to_cpu(agf->agf_freeblks); |
cdded3d8 | 3005 | pag->pagf_btreeblks = be32_to_cpu(agf->agf_btreeblks); |
6e3140c7 NS |
3006 | pag->pagf_flcount = be32_to_cpu(agf->agf_flcount); |
3007 | pag->pagf_longest = be32_to_cpu(agf->agf_longest); | |
2bd0ea18 | 3008 | pag->pagf_levels[XFS_BTNUM_BNOi] = |
6e3140c7 | 3009 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNOi]); |
2bd0ea18 | 3010 | pag->pagf_levels[XFS_BTNUM_CNTi] = |
6e3140c7 | 3011 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi]); |
e37838e5 DW |
3012 | pag->pagf_levels[XFS_BTNUM_RMAPi] = |
3013 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAPi]); | |
88ce0792 | 3014 | pag->pagf_refcount_level = be32_to_cpu(agf->agf_refcount_level); |
2bd0ea18 | 3015 | pag->pagf_init = 1; |
8dbee8f5 | 3016 | pag->pagf_agflreset = xfs_agfl_needs_reset(mp, agf); |
2bd0ea18 NS |
3017 | } |
3018 | #ifdef DEBUG | |
3019 | else if (!XFS_FORCED_SHUTDOWN(mp)) { | |
6e3140c7 | 3020 | ASSERT(pag->pagf_freeblks == be32_to_cpu(agf->agf_freeblks)); |
cdded3d8 | 3021 | ASSERT(pag->pagf_btreeblks == be32_to_cpu(agf->agf_btreeblks)); |
6e3140c7 NS |
3022 | ASSERT(pag->pagf_flcount == be32_to_cpu(agf->agf_flcount)); |
3023 | ASSERT(pag->pagf_longest == be32_to_cpu(agf->agf_longest)); | |
2bd0ea18 | 3024 | ASSERT(pag->pagf_levels[XFS_BTNUM_BNOi] == |
6e3140c7 | 3025 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNOi])); |
2bd0ea18 | 3026 | ASSERT(pag->pagf_levels[XFS_BTNUM_CNTi] == |
6e3140c7 | 3027 | be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi])); |
2bd0ea18 NS |
3028 | } |
3029 | #endif | |
56b2de80 | 3030 | xfs_perag_put(pag); |
2bd0ea18 NS |
3031 | return 0; |
3032 | } | |
3033 | ||
3034 | /* | |
3035 | * Allocate an extent (variable-size). | |
3036 | * Depending on the allocation type, we either look in a single allocation | |
3037 | * group or loop over the allocation groups to find the result. | |
3038 | */ | |
3039 | int /* error */ | |
3040 | xfs_alloc_vextent( | |
03aeb29d | 3041 | struct xfs_alloc_arg *args) /* allocation argument structure */ |
2bd0ea18 | 3042 | { |
03aeb29d BF |
3043 | xfs_agblock_t agsize; /* allocation group size */ |
3044 | int error; | |
3045 | int flags; /* XFS_ALLOC_FLAG_... locking flags */ | |
3046 | struct xfs_mount *mp; /* mount structure pointer */ | |
3047 | xfs_agnumber_t sagno; /* starting allocation group number */ | |
3048 | xfs_alloctype_t type; /* input allocation type */ | |
3049 | int bump_rotor = 0; | |
3050 | xfs_agnumber_t rotorstep = xfs_rotorstep; /* inode32 agf stepper */ | |
2bd0ea18 NS |
3051 | |
3052 | mp = args->mp; | |
3053 | type = args->otype = args->type; | |
3054 | args->agbno = NULLAGBLOCK; | |
3055 | /* | |
3056 | * Just fix this up, for the case where the last a.g. is shorter | |
3057 | * (or there's only one a.g.) and the caller couldn't easily figure | |
3058 | * that out (xfs_bmap_alloc). | |
3059 | */ | |
3060 | agsize = mp->m_sb.sb_agblocks; | |
3061 | if (args->maxlen > agsize) | |
3062 | args->maxlen = agsize; | |
3063 | if (args->alignment == 0) | |
3064 | args->alignment = 1; | |
3065 | ASSERT(XFS_FSB_TO_AGNO(mp, args->fsbno) < mp->m_sb.sb_agcount); | |
3066 | ASSERT(XFS_FSB_TO_AGBNO(mp, args->fsbno) < agsize); | |
3067 | ASSERT(args->minlen <= args->maxlen); | |
3068 | ASSERT(args->minlen <= agsize); | |
3069 | ASSERT(args->mod < args->prod); | |
3070 | if (XFS_FSB_TO_AGNO(mp, args->fsbno) >= mp->m_sb.sb_agcount || | |
3071 | XFS_FSB_TO_AGBNO(mp, args->fsbno) >= agsize || | |
3072 | args->minlen > args->maxlen || args->minlen > agsize || | |
3073 | args->mod >= args->prod) { | |
3074 | args->fsbno = NULLFSBLOCK; | |
56b2de80 | 3075 | trace_xfs_alloc_vextent_badargs(args); |
2bd0ea18 NS |
3076 | return 0; |
3077 | } | |
9baa549b | 3078 | |
2bd0ea18 NS |
3079 | switch (type) { |
3080 | case XFS_ALLOCTYPE_THIS_AG: | |
3081 | case XFS_ALLOCTYPE_NEAR_BNO: | |
3082 | case XFS_ALLOCTYPE_THIS_BNO: | |
3083 | /* | |
3084 | * These three force us into a single a.g. | |
3085 | */ | |
3086 | args->agno = XFS_FSB_TO_AGNO(mp, args->fsbno); | |
56b2de80 | 3087 | args->pag = xfs_perag_get(mp, args->agno); |
2bd0ea18 | 3088 | error = xfs_alloc_fix_freelist(args, 0); |
2bd0ea18 | 3089 | if (error) { |
56b2de80 | 3090 | trace_xfs_alloc_vextent_nofix(args); |
2bd0ea18 NS |
3091 | goto error0; |
3092 | } | |
3093 | if (!args->agbp) { | |
56b2de80 | 3094 | trace_xfs_alloc_vextent_noagbp(args); |
2bd0ea18 NS |
3095 | break; |
3096 | } | |
3097 | args->agbno = XFS_FSB_TO_AGBNO(mp, args->fsbno); | |
0e266570 | 3098 | if ((error = xfs_alloc_ag_vextent(args))) |
2bd0ea18 | 3099 | goto error0; |
2bd0ea18 NS |
3100 | break; |
3101 | case XFS_ALLOCTYPE_START_BNO: | |
3102 | /* | |
3103 | * Try near allocation first, then anywhere-in-ag after | |
3104 | * the first a.g. fails. | |
3105 | */ | |
1fccd5c8 | 3106 | if ((args->datatype & XFS_ALLOC_INITIAL_USER_DATA) && |
34317449 | 3107 | (mp->m_flags & XFS_MOUNT_32BITINODES)) { |
46eca962 NS |
3108 | args->fsbno = XFS_AGB_TO_FSB(mp, |
3109 | ((mp->m_agfrotor / rotorstep) % | |
3110 | mp->m_sb.sb_agcount), 0); | |
34317449 NS |
3111 | bump_rotor = 1; |
3112 | } | |
2bd0ea18 NS |
3113 | args->agbno = XFS_FSB_TO_AGBNO(mp, args->fsbno); |
3114 | args->type = XFS_ALLOCTYPE_NEAR_BNO; | |
3115 | /* FALLTHROUGH */ | |
2bd0ea18 NS |
3116 | case XFS_ALLOCTYPE_FIRST_AG: |
3117 | /* | |
3118 | * Rotate through the allocation groups looking for a winner. | |
3119 | */ | |
f3eda3a5 | 3120 | if (type == XFS_ALLOCTYPE_FIRST_AG) { |
2bd0ea18 NS |
3121 | /* |
3122 | * Start with allocation group given by bno. | |
3123 | */ | |
3124 | args->agno = XFS_FSB_TO_AGNO(mp, args->fsbno); | |
3125 | args->type = XFS_ALLOCTYPE_THIS_AG; | |
3126 | sagno = 0; | |
3127 | flags = 0; | |
3128 | } else { | |
2bd0ea18 NS |
3129 | /* |
3130 | * Start with the given allocation group. | |
3131 | */ | |
3132 | args->agno = sagno = XFS_FSB_TO_AGNO(mp, args->fsbno); | |
3133 | flags = XFS_ALLOC_FLAG_TRYLOCK; | |
3134 | } | |
3135 | /* | |
3136 | * Loop over allocation groups twice; first time with | |
3137 | * trylock set, second time without. | |
3138 | */ | |
3139 | for (;;) { | |
56b2de80 | 3140 | args->pag = xfs_perag_get(mp, args->agno); |
9baa549b | 3141 | error = xfs_alloc_fix_freelist(args, flags); |
9baa549b | 3142 | if (error) { |
56b2de80 | 3143 | trace_xfs_alloc_vextent_nofix(args); |
2bd0ea18 NS |
3144 | goto error0; |
3145 | } | |
3146 | /* | |
3147 | * If we get a buffer back then the allocation will fly. | |
3148 | */ | |
3149 | if (args->agbp) { | |
0e266570 | 3150 | if ((error = xfs_alloc_ag_vextent(args))) |
2bd0ea18 | 3151 | goto error0; |
2bd0ea18 NS |
3152 | break; |
3153 | } | |
56b2de80 DC |
3154 | |
3155 | trace_xfs_alloc_vextent_loopfailed(args); | |
3156 | ||
2bd0ea18 NS |
3157 | /* |
3158 | * Didn't work, figure out the next iteration. | |
3159 | */ | |
3160 | if (args->agno == sagno && | |
3161 | type == XFS_ALLOCTYPE_START_BNO) | |
3162 | args->type = XFS_ALLOCTYPE_THIS_AG; | |
5e656dbb BN |
3163 | /* |
3164 | * For the first allocation, we can try any AG to get | |
3165 | * space. However, if we already have allocated a | |
3166 | * block, we don't want to try AGs whose number is below | |
3167 | * sagno. Otherwise, we may end up with out-of-order | |
3168 | * locking of AGF, which might cause deadlock. | |
3169 | */ | |
3170 | if (++(args->agno) == mp->m_sb.sb_agcount) { | |
03aeb29d | 3171 | if (args->tp->t_firstblock != NULLFSBLOCK) |
5e656dbb BN |
3172 | args->agno = sagno; |
3173 | else | |
3174 | args->agno = 0; | |
3175 | } | |
5000d01d | 3176 | /* |
2bd0ea18 NS |
3177 | * Reached the starting a.g., must either be done |
3178 | * or switch to non-trylock mode. | |
3179 | */ | |
3180 | if (args->agno == sagno) { | |
a3b4a951 | 3181 | if (flags == 0) { |
2bd0ea18 | 3182 | args->agbno = NULLAGBLOCK; |
56b2de80 | 3183 | trace_xfs_alloc_vextent_allfailed(args); |
2bd0ea18 NS |
3184 | break; |
3185 | } | |
a3b4a951 CH |
3186 | |
3187 | flags = 0; | |
3188 | if (type == XFS_ALLOCTYPE_START_BNO) { | |
3189 | args->agbno = XFS_FSB_TO_AGBNO(mp, | |
3190 | args->fsbno); | |
3191 | args->type = XFS_ALLOCTYPE_NEAR_BNO; | |
2bd0ea18 NS |
3192 | } |
3193 | } | |
56b2de80 | 3194 | xfs_perag_put(args->pag); |
2bd0ea18 | 3195 | } |
f3eda3a5 | 3196 | if (bump_rotor) { |
46eca962 NS |
3197 | if (args->agno == sagno) |
3198 | mp->m_agfrotor = (mp->m_agfrotor + 1) % | |
3199 | (mp->m_sb.sb_agcount * rotorstep); | |
3200 | else | |
3201 | mp->m_agfrotor = (args->agno * rotorstep + 1) % | |
3202 | (mp->m_sb.sb_agcount * rotorstep); | |
3203 | } | |
2bd0ea18 NS |
3204 | break; |
3205 | default: | |
3206 | ASSERT(0); | |
3207 | /* NOTREACHED */ | |
3208 | } | |
3209 | if (args->agbno == NULLAGBLOCK) | |
3210 | args->fsbno = NULLFSBLOCK; | |
3211 | else { | |
3212 | args->fsbno = XFS_AGB_TO_FSB(mp, args->agno, args->agbno); | |
3213 | #ifdef DEBUG | |
3214 | ASSERT(args->len >= args->minlen); | |
3215 | ASSERT(args->len <= args->maxlen); | |
3216 | ASSERT(args->agbno % args->alignment == 0); | |
3217 | XFS_AG_CHECK_DADDR(mp, XFS_FSB_TO_DADDR(mp, args->fsbno), | |
3218 | args->len); | |
3219 | #endif | |
9542ae13 | 3220 | |
2bd0ea18 | 3221 | } |
56b2de80 | 3222 | xfs_perag_put(args->pag); |
2bd0ea18 NS |
3223 | return 0; |
3224 | error0: | |
56b2de80 | 3225 | xfs_perag_put(args->pag); |
2bd0ea18 NS |
3226 | return error; |
3227 | } | |
3228 | ||
2a6da3b8 DC |
3229 | /* Ensure that the freelist is at full capacity. */ |
3230 | int | |
3231 | xfs_free_extent_fix_freelist( | |
3232 | struct xfs_trans *tp, | |
3233 | xfs_agnumber_t agno, | |
3234 | struct xfs_buf **agbp) | |
2bd0ea18 | 3235 | { |
2a6da3b8 DC |
3236 | struct xfs_alloc_arg args; |
3237 | int error; | |
2bd0ea18 | 3238 | |
2a6da3b8 | 3239 | memset(&args, 0, sizeof(struct xfs_alloc_arg)); |
2bd0ea18 NS |
3240 | args.tp = tp; |
3241 | args.mp = tp->t_mountp; | |
2a6da3b8 | 3242 | args.agno = agno; |
a2ceac1f DC |
3243 | |
3244 | /* | |
3245 | * validate that the block number is legal - the enables us to detect | |
3246 | * and handle a silent filesystem corruption rather than crashing. | |
3247 | */ | |
a2ceac1f | 3248 | if (args.agno >= args.mp->m_sb.sb_agcount) |
12b53197 | 3249 | return -EFSCORRUPTED; |
a2ceac1f | 3250 | |
56b2de80 | 3251 | args.pag = xfs_perag_get(args.mp, args.agno); |
a2ceac1f DC |
3252 | ASSERT(args.pag); |
3253 | ||
3254 | error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING); | |
3255 | if (error) | |
2a6da3b8 DC |
3256 | goto out; |
3257 | ||
3258 | *agbp = args.agbp; | |
3259 | out: | |
3260 | xfs_perag_put(args.pag); | |
3261 | return error; | |
3262 | } | |
3263 | ||
3264 | /* | |
3265 | * Free an extent. | |
3266 | * Just break up the extent address and hand off to xfs_free_ag_extent | |
3267 | * after fixing up the freelist. | |
3268 | */ | |
5837e73b | 3269 | int |
3a13f959 | 3270 | __xfs_free_extent( |
5837e73b DW |
3271 | struct xfs_trans *tp, |
3272 | xfs_fsblock_t bno, | |
3273 | xfs_extlen_t len, | |
3274 | const struct xfs_owner_info *oinfo, | |
3275 | enum xfs_ag_resv_type type, | |
3276 | bool skip_discard) | |
2a6da3b8 | 3277 | { |
5837e73b DW |
3278 | struct xfs_mount *mp = tp->t_mountp; |
3279 | struct xfs_buf *agbp; | |
3280 | xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, bno); | |
3281 | xfs_agblock_t agbno = XFS_FSB_TO_AGBNO(mp, bno); | |
3282 | int error; | |
3283 | unsigned int busy_flags = 0; | |
2a6da3b8 DC |
3284 | |
3285 | ASSERT(len != 0); | |
9760cac2 | 3286 | ASSERT(type != XFS_AG_RESV_AGFL); |
2a6da3b8 | 3287 | |
a9da40de | 3288 | if (XFS_TEST_ERROR(false, mp, |
e2a190dd | 3289 | XFS_ERRTAG_FREE_EXTENT)) |
a9da40de DW |
3290 | return -EIO; |
3291 | ||
2a6da3b8 DC |
3292 | error = xfs_free_extent_fix_freelist(tp, agno, &agbp); |
3293 | if (error) | |
3294 | return error; | |
3295 | ||
fbb4fa7f DW |
3296 | if (XFS_IS_CORRUPT(mp, agbno >= mp->m_sb.sb_agblocks)) { |
3297 | error = -EFSCORRUPTED; | |
3298 | goto err; | |
3299 | } | |
a2ceac1f DC |
3300 | |
3301 | /* validate the extent size is legal now we have the agf locked */ | |
fbb4fa7f DW |
3302 | if (XFS_IS_CORRUPT(mp, |
3303 | agbno + len > | |
3304 | be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_length))) { | |
3305 | error = -EFSCORRUPTED; | |
3306 | goto err; | |
3307 | } | |
a2ceac1f | 3308 | |
cf8ce220 | 3309 | error = xfs_free_ag_extent(tp, agbp, agno, agbno, len, oinfo, type); |
2a6da3b8 DC |
3310 | if (error) |
3311 | goto err; | |
3312 | ||
3a13f959 BF |
3313 | if (skip_discard) |
3314 | busy_flags |= XFS_EXTENT_BUSY_SKIP_DISCARD; | |
3315 | xfs_extent_busy_insert(tp, agno, agbno, len, busy_flags); | |
2a6da3b8 DC |
3316 | return 0; |
3317 | ||
3318 | err: | |
3319 | xfs_trans_brelse(tp, agbp); | |
2bd0ea18 NS |
3320 | return error; |
3321 | } | |
b3d83fa6 DW |
3322 | |
3323 | struct xfs_alloc_query_range_info { | |
3324 | xfs_alloc_query_range_fn fn; | |
3325 | void *priv; | |
3326 | }; | |
3327 | ||
3328 | /* Format btree record and pass to our callback. */ | |
3329 | STATIC int | |
3330 | xfs_alloc_query_range_helper( | |
3331 | struct xfs_btree_cur *cur, | |
3332 | union xfs_btree_rec *rec, | |
3333 | void *priv) | |
3334 | { | |
3335 | struct xfs_alloc_query_range_info *query = priv; | |
3336 | struct xfs_alloc_rec_incore irec; | |
3337 | ||
3338 | irec.ar_startblock = be32_to_cpu(rec->alloc.ar_startblock); | |
3339 | irec.ar_blockcount = be32_to_cpu(rec->alloc.ar_blockcount); | |
3340 | return query->fn(cur, &irec, query->priv); | |
3341 | } | |
3342 | ||
3343 | /* Find all free space within a given range of blocks. */ | |
3344 | int | |
3345 | xfs_alloc_query_range( | |
3346 | struct xfs_btree_cur *cur, | |
3347 | struct xfs_alloc_rec_incore *low_rec, | |
3348 | struct xfs_alloc_rec_incore *high_rec, | |
3349 | xfs_alloc_query_range_fn fn, | |
3350 | void *priv) | |
3351 | { | |
3352 | union xfs_btree_irec low_brec; | |
3353 | union xfs_btree_irec high_brec; | |
3354 | struct xfs_alloc_query_range_info query; | |
3355 | ||
3356 | ASSERT(cur->bc_btnum == XFS_BTNUM_BNO); | |
3357 | low_brec.a = *low_rec; | |
3358 | high_brec.a = *high_rec; | |
3359 | query.priv = priv; | |
3360 | query.fn = fn; | |
3361 | return xfs_btree_query_range(cur, &low_brec, &high_brec, | |
3362 | xfs_alloc_query_range_helper, &query); | |
3363 | } | |
7e05e856 DW |
3364 | |
3365 | /* Find all free space records. */ | |
3366 | int | |
3367 | xfs_alloc_query_all( | |
3368 | struct xfs_btree_cur *cur, | |
3369 | xfs_alloc_query_range_fn fn, | |
3370 | void *priv) | |
3371 | { | |
3372 | struct xfs_alloc_query_range_info query; | |
3373 | ||
3374 | ASSERT(cur->bc_btnum == XFS_BTNUM_BNO); | |
3375 | query.priv = priv; | |
3376 | query.fn = fn; | |
3377 | return xfs_btree_query_all(cur, xfs_alloc_query_range_helper, &query); | |
3378 | } | |
9bef6258 | 3379 | |
1fe41a73 DW |
3380 | /* Is there a record covering a given extent? */ |
3381 | int | |
3382 | xfs_alloc_has_record( | |
3383 | struct xfs_btree_cur *cur, | |
3384 | xfs_agblock_t bno, | |
3385 | xfs_extlen_t len, | |
3386 | bool *exists) | |
3387 | { | |
3388 | union xfs_btree_irec low; | |
3389 | union xfs_btree_irec high; | |
3390 | ||
3391 | memset(&low, 0, sizeof(low)); | |
3392 | low.a.ar_startblock = bno; | |
3393 | memset(&high, 0xFF, sizeof(high)); | |
3394 | high.a.ar_startblock = bno + len - 1; | |
3395 | ||
3396 | return xfs_btree_has_record(cur, &low, &high, exists); | |
3397 | } | |
71a98c66 DW |
3398 | |
3399 | /* | |
3400 | * Walk all the blocks in the AGFL. The @walk_fn can return any negative | |
4a509d6d | 3401 | * error code or XFS_ITER_*. |
71a98c66 DW |
3402 | */ |
3403 | int | |
3404 | xfs_agfl_walk( | |
3405 | struct xfs_mount *mp, | |
3406 | struct xfs_agf *agf, | |
3407 | struct xfs_buf *agflbp, | |
3408 | xfs_agfl_walk_fn walk_fn, | |
3409 | void *priv) | |
3410 | { | |
3411 | __be32 *agfl_bno; | |
3412 | unsigned int i; | |
3413 | int error; | |
3414 | ||
3415 | agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp); | |
3416 | i = be32_to_cpu(agf->agf_flfirst); | |
3417 | ||
3418 | /* Nothing to walk in an empty AGFL. */ | |
3419 | if (agf->agf_flcount == cpu_to_be32(0)) | |
3420 | return 0; | |
3421 | ||
3422 | /* Otherwise, walk from first to last, wrapping as needed. */ | |
3423 | for (;;) { | |
3424 | error = walk_fn(mp, be32_to_cpu(agfl_bno[i]), priv); | |
3425 | if (error) | |
3426 | return error; | |
3427 | if (i == be32_to_cpu(agf->agf_fllast)) | |
3428 | break; | |
3429 | if (++i == xfs_agfl_size(mp)) | |
3430 | i = 0; | |
3431 | } | |
3432 | ||
3433 | return 0; | |
3434 | } |