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68988114 DC |
1 | /* |
2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. | |
c24b5dfa | 3 | * Copyright (c) 2012 Red Hat, Inc. |
68988114 DC |
4 | * All Rights Reserved. |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it would be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write the Free Software Foundation, | |
17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
19 | #include "xfs.h" | |
20 | #include "xfs_fs.h" | |
21 | #include "xfs_format.h" | |
22 | #include "xfs_bit.h" | |
23 | #include "xfs_log.h" | |
24 | #include "xfs_inum.h" | |
25 | #include "xfs_trans.h" | |
26 | #include "xfs_sb.h" | |
27 | #include "xfs_ag.h" | |
28 | #include "xfs_mount.h" | |
29 | #include "xfs_da_btree.h" | |
30 | #include "xfs_bmap_btree.h" | |
31 | #include "xfs_alloc_btree.h" | |
32 | #include "xfs_ialloc_btree.h" | |
33 | #include "xfs_dinode.h" | |
34 | #include "xfs_inode.h" | |
35 | #include "xfs_btree.h" | |
36 | #include "xfs_extfree_item.h" | |
37 | #include "xfs_alloc.h" | |
38 | #include "xfs_bmap.h" | |
39 | #include "xfs_bmap_util.h" | |
40 | #include "xfs_rtalloc.h" | |
41 | #include "xfs_error.h" | |
42 | #include "xfs_quota.h" | |
43 | #include "xfs_trans_space.h" | |
44 | #include "xfs_trace.h" | |
c24b5dfa | 45 | #include "xfs_icache.h" |
68988114 DC |
46 | |
47 | /* Kernel only BMAP related definitions and functions */ | |
48 | ||
49 | /* | |
50 | * Convert the given file system block to a disk block. We have to treat it | |
51 | * differently based on whether the file is a real time file or not, because the | |
52 | * bmap code does. | |
53 | */ | |
54 | xfs_daddr_t | |
55 | xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb) | |
56 | { | |
57 | return (XFS_IS_REALTIME_INODE(ip) ? \ | |
58 | (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \ | |
59 | XFS_FSB_TO_DADDR((ip)->i_mount, (fsb))); | |
60 | } | |
61 | ||
62 | /* | |
63 | * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi | |
64 | * caller. Frees all the extents that need freeing, which must be done | |
65 | * last due to locking considerations. We never free any extents in | |
66 | * the first transaction. | |
67 | * | |
68 | * Return 1 if the given transaction was committed and a new one | |
69 | * started, and 0 otherwise in the committed parameter. | |
70 | */ | |
71 | int /* error */ | |
72 | xfs_bmap_finish( | |
73 | xfs_trans_t **tp, /* transaction pointer addr */ | |
74 | xfs_bmap_free_t *flist, /* i/o: list extents to free */ | |
75 | int *committed) /* xact committed or not */ | |
76 | { | |
77 | xfs_efd_log_item_t *efd; /* extent free data */ | |
78 | xfs_efi_log_item_t *efi; /* extent free intention */ | |
79 | int error; /* error return value */ | |
80 | xfs_bmap_free_item_t *free; /* free extent item */ | |
3d3c8b52 | 81 | struct xfs_trans_res tres; /* new log reservation */ |
68988114 DC |
82 | xfs_mount_t *mp; /* filesystem mount structure */ |
83 | xfs_bmap_free_item_t *next; /* next item on free list */ | |
84 | xfs_trans_t *ntp; /* new transaction pointer */ | |
85 | ||
86 | ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES); | |
87 | if (flist->xbf_count == 0) { | |
88 | *committed = 0; | |
89 | return 0; | |
90 | } | |
91 | ntp = *tp; | |
92 | efi = xfs_trans_get_efi(ntp, flist->xbf_count); | |
93 | for (free = flist->xbf_first; free; free = free->xbfi_next) | |
94 | xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock, | |
95 | free->xbfi_blockcount); | |
3d3c8b52 JL |
96 | |
97 | tres.tr_logres = ntp->t_log_res; | |
98 | tres.tr_logcount = ntp->t_log_count; | |
99 | tres.tr_logflags = XFS_TRANS_PERM_LOG_RES; | |
68988114 DC |
100 | ntp = xfs_trans_dup(*tp); |
101 | error = xfs_trans_commit(*tp, 0); | |
102 | *tp = ntp; | |
103 | *committed = 1; | |
104 | /* | |
105 | * We have a new transaction, so we should return committed=1, | |
106 | * even though we're returning an error. | |
107 | */ | |
108 | if (error) | |
109 | return error; | |
110 | ||
111 | /* | |
112 | * transaction commit worked ok so we can drop the extra ticket | |
113 | * reference that we gained in xfs_trans_dup() | |
114 | */ | |
115 | xfs_log_ticket_put(ntp->t_ticket); | |
116 | ||
3d3c8b52 JL |
117 | error = xfs_trans_reserve(ntp, &tres, 0, 0); |
118 | if (error) | |
68988114 DC |
119 | return error; |
120 | efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count); | |
121 | for (free = flist->xbf_first; free != NULL; free = next) { | |
122 | next = free->xbfi_next; | |
123 | if ((error = xfs_free_extent(ntp, free->xbfi_startblock, | |
124 | free->xbfi_blockcount))) { | |
125 | /* | |
126 | * The bmap free list will be cleaned up at a | |
127 | * higher level. The EFI will be canceled when | |
128 | * this transaction is aborted. | |
129 | * Need to force shutdown here to make sure it | |
130 | * happens, since this transaction may not be | |
131 | * dirty yet. | |
132 | */ | |
133 | mp = ntp->t_mountp; | |
134 | if (!XFS_FORCED_SHUTDOWN(mp)) | |
135 | xfs_force_shutdown(mp, | |
136 | (error == EFSCORRUPTED) ? | |
137 | SHUTDOWN_CORRUPT_INCORE : | |
138 | SHUTDOWN_META_IO_ERROR); | |
139 | return error; | |
140 | } | |
141 | xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock, | |
142 | free->xbfi_blockcount); | |
143 | xfs_bmap_del_free(flist, NULL, free); | |
144 | } | |
145 | return 0; | |
146 | } | |
147 | ||
148 | int | |
149 | xfs_bmap_rtalloc( | |
150 | struct xfs_bmalloca *ap) /* bmap alloc argument struct */ | |
151 | { | |
152 | xfs_alloctype_t atype = 0; /* type for allocation routines */ | |
153 | int error; /* error return value */ | |
154 | xfs_mount_t *mp; /* mount point structure */ | |
155 | xfs_extlen_t prod = 0; /* product factor for allocators */ | |
156 | xfs_extlen_t ralen = 0; /* realtime allocation length */ | |
157 | xfs_extlen_t align; /* minimum allocation alignment */ | |
158 | xfs_rtblock_t rtb; | |
159 | ||
160 | mp = ap->ip->i_mount; | |
161 | align = xfs_get_extsz_hint(ap->ip); | |
162 | prod = align / mp->m_sb.sb_rextsize; | |
163 | error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, | |
164 | align, 1, ap->eof, 0, | |
165 | ap->conv, &ap->offset, &ap->length); | |
166 | if (error) | |
167 | return error; | |
168 | ASSERT(ap->length); | |
169 | ASSERT(ap->length % mp->m_sb.sb_rextsize == 0); | |
170 | ||
171 | /* | |
172 | * If the offset & length are not perfectly aligned | |
173 | * then kill prod, it will just get us in trouble. | |
174 | */ | |
175 | if (do_mod(ap->offset, align) || ap->length % align) | |
176 | prod = 1; | |
177 | /* | |
178 | * Set ralen to be the actual requested length in rtextents. | |
179 | */ | |
180 | ralen = ap->length / mp->m_sb.sb_rextsize; | |
181 | /* | |
182 | * If the old value was close enough to MAXEXTLEN that | |
183 | * we rounded up to it, cut it back so it's valid again. | |
184 | * Note that if it's a really large request (bigger than | |
185 | * MAXEXTLEN), we don't hear about that number, and can't | |
186 | * adjust the starting point to match it. | |
187 | */ | |
188 | if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN) | |
189 | ralen = MAXEXTLEN / mp->m_sb.sb_rextsize; | |
190 | ||
191 | /* | |
192 | * Lock out other modifications to the RT bitmap inode. | |
193 | */ | |
194 | xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL); | |
195 | xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL); | |
196 | ||
197 | /* | |
198 | * If it's an allocation to an empty file at offset 0, | |
199 | * pick an extent that will space things out in the rt area. | |
200 | */ | |
201 | if (ap->eof && ap->offset == 0) { | |
202 | xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */ | |
203 | ||
204 | error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx); | |
205 | if (error) | |
206 | return error; | |
207 | ap->blkno = rtx * mp->m_sb.sb_rextsize; | |
208 | } else { | |
209 | ap->blkno = 0; | |
210 | } | |
211 | ||
212 | xfs_bmap_adjacent(ap); | |
213 | ||
214 | /* | |
215 | * Realtime allocation, done through xfs_rtallocate_extent. | |
216 | */ | |
217 | atype = ap->blkno == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO; | |
218 | do_div(ap->blkno, mp->m_sb.sb_rextsize); | |
219 | rtb = ap->blkno; | |
220 | ap->length = ralen; | |
221 | if ((error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, ap->length, | |
222 | &ralen, atype, ap->wasdel, prod, &rtb))) | |
223 | return error; | |
224 | if (rtb == NULLFSBLOCK && prod > 1 && | |
225 | (error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, | |
226 | ap->length, &ralen, atype, | |
227 | ap->wasdel, 1, &rtb))) | |
228 | return error; | |
229 | ap->blkno = rtb; | |
230 | if (ap->blkno != NULLFSBLOCK) { | |
231 | ap->blkno *= mp->m_sb.sb_rextsize; | |
232 | ralen *= mp->m_sb.sb_rextsize; | |
233 | ap->length = ralen; | |
234 | ap->ip->i_d.di_nblocks += ralen; | |
235 | xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE); | |
236 | if (ap->wasdel) | |
237 | ap->ip->i_delayed_blks -= ralen; | |
238 | /* | |
239 | * Adjust the disk quota also. This was reserved | |
240 | * earlier. | |
241 | */ | |
242 | xfs_trans_mod_dquot_byino(ap->tp, ap->ip, | |
243 | ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT : | |
244 | XFS_TRANS_DQ_RTBCOUNT, (long) ralen); | |
245 | } else { | |
246 | ap->length = 0; | |
247 | } | |
248 | return 0; | |
249 | } | |
250 | ||
251 | /* | |
252 | * Stack switching interfaces for allocation | |
253 | */ | |
254 | static void | |
255 | xfs_bmapi_allocate_worker( | |
256 | struct work_struct *work) | |
257 | { | |
258 | struct xfs_bmalloca *args = container_of(work, | |
259 | struct xfs_bmalloca, work); | |
260 | unsigned long pflags; | |
261 | ||
262 | /* we are in a transaction context here */ | |
263 | current_set_flags_nested(&pflags, PF_FSTRANS); | |
264 | ||
265 | args->result = __xfs_bmapi_allocate(args); | |
266 | complete(args->done); | |
267 | ||
268 | current_restore_flags_nested(&pflags, PF_FSTRANS); | |
269 | } | |
270 | ||
271 | /* | |
272 | * Some allocation requests often come in with little stack to work on. Push | |
273 | * them off to a worker thread so there is lots of stack to use. Otherwise just | |
274 | * call directly to avoid the context switch overhead here. | |
275 | */ | |
276 | int | |
277 | xfs_bmapi_allocate( | |
278 | struct xfs_bmalloca *args) | |
279 | { | |
280 | DECLARE_COMPLETION_ONSTACK(done); | |
281 | ||
282 | if (!args->stack_switch) | |
283 | return __xfs_bmapi_allocate(args); | |
284 | ||
285 | ||
286 | args->done = &done; | |
287 | INIT_WORK_ONSTACK(&args->work, xfs_bmapi_allocate_worker); | |
288 | queue_work(xfs_alloc_wq, &args->work); | |
289 | wait_for_completion(&done); | |
290 | return args->result; | |
291 | } | |
292 | ||
293 | /* | |
294 | * Check if the endoff is outside the last extent. If so the caller will grow | |
295 | * the allocation to a stripe unit boundary. All offsets are considered outside | |
296 | * the end of file for an empty fork, so 1 is returned in *eof in that case. | |
297 | */ | |
298 | int | |
299 | xfs_bmap_eof( | |
300 | struct xfs_inode *ip, | |
301 | xfs_fileoff_t endoff, | |
302 | int whichfork, | |
303 | int *eof) | |
304 | { | |
305 | struct xfs_bmbt_irec rec; | |
306 | int error; | |
307 | ||
308 | error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, eof); | |
309 | if (error || *eof) | |
310 | return error; | |
311 | ||
312 | *eof = endoff >= rec.br_startoff + rec.br_blockcount; | |
313 | return 0; | |
314 | } | |
315 | ||
316 | /* | |
317 | * Extent tree block counting routines. | |
318 | */ | |
319 | ||
320 | /* | |
321 | * Count leaf blocks given a range of extent records. | |
322 | */ | |
323 | STATIC void | |
324 | xfs_bmap_count_leaves( | |
325 | xfs_ifork_t *ifp, | |
326 | xfs_extnum_t idx, | |
327 | int numrecs, | |
328 | int *count) | |
329 | { | |
330 | int b; | |
331 | ||
332 | for (b = 0; b < numrecs; b++) { | |
333 | xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b); | |
334 | *count += xfs_bmbt_get_blockcount(frp); | |
335 | } | |
336 | } | |
337 | ||
338 | /* | |
339 | * Count leaf blocks given a range of extent records originally | |
340 | * in btree format. | |
341 | */ | |
342 | STATIC void | |
343 | xfs_bmap_disk_count_leaves( | |
344 | struct xfs_mount *mp, | |
345 | struct xfs_btree_block *block, | |
346 | int numrecs, | |
347 | int *count) | |
348 | { | |
349 | int b; | |
350 | xfs_bmbt_rec_t *frp; | |
351 | ||
352 | for (b = 1; b <= numrecs; b++) { | |
353 | frp = XFS_BMBT_REC_ADDR(mp, block, b); | |
354 | *count += xfs_bmbt_disk_get_blockcount(frp); | |
355 | } | |
356 | } | |
357 | ||
358 | /* | |
359 | * Recursively walks each level of a btree | |
8be11e92 | 360 | * to count total fsblocks in use. |
68988114 DC |
361 | */ |
362 | STATIC int /* error */ | |
363 | xfs_bmap_count_tree( | |
364 | xfs_mount_t *mp, /* file system mount point */ | |
365 | xfs_trans_t *tp, /* transaction pointer */ | |
366 | xfs_ifork_t *ifp, /* inode fork pointer */ | |
367 | xfs_fsblock_t blockno, /* file system block number */ | |
368 | int levelin, /* level in btree */ | |
369 | int *count) /* Count of blocks */ | |
370 | { | |
371 | int error; | |
372 | xfs_buf_t *bp, *nbp; | |
373 | int level = levelin; | |
374 | __be64 *pp; | |
375 | xfs_fsblock_t bno = blockno; | |
376 | xfs_fsblock_t nextbno; | |
377 | struct xfs_btree_block *block, *nextblock; | |
378 | int numrecs; | |
379 | ||
380 | error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF, | |
381 | &xfs_bmbt_buf_ops); | |
382 | if (error) | |
383 | return error; | |
384 | *count += 1; | |
385 | block = XFS_BUF_TO_BLOCK(bp); | |
386 | ||
387 | if (--level) { | |
388 | /* Not at node above leaves, count this level of nodes */ | |
389 | nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib); | |
390 | while (nextbno != NULLFSBLOCK) { | |
391 | error = xfs_btree_read_bufl(mp, tp, nextbno, 0, &nbp, | |
392 | XFS_BMAP_BTREE_REF, | |
393 | &xfs_bmbt_buf_ops); | |
394 | if (error) | |
395 | return error; | |
396 | *count += 1; | |
397 | nextblock = XFS_BUF_TO_BLOCK(nbp); | |
398 | nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib); | |
399 | xfs_trans_brelse(tp, nbp); | |
400 | } | |
401 | ||
402 | /* Dive to the next level */ | |
403 | pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]); | |
404 | bno = be64_to_cpu(*pp); | |
405 | if (unlikely((error = | |
406 | xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) { | |
407 | xfs_trans_brelse(tp, bp); | |
408 | XFS_ERROR_REPORT("xfs_bmap_count_tree(1)", | |
409 | XFS_ERRLEVEL_LOW, mp); | |
410 | return XFS_ERROR(EFSCORRUPTED); | |
411 | } | |
412 | xfs_trans_brelse(tp, bp); | |
413 | } else { | |
414 | /* count all level 1 nodes and their leaves */ | |
415 | for (;;) { | |
416 | nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib); | |
417 | numrecs = be16_to_cpu(block->bb_numrecs); | |
418 | xfs_bmap_disk_count_leaves(mp, block, numrecs, count); | |
419 | xfs_trans_brelse(tp, bp); | |
420 | if (nextbno == NULLFSBLOCK) | |
421 | break; | |
422 | bno = nextbno; | |
423 | error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, | |
424 | XFS_BMAP_BTREE_REF, | |
425 | &xfs_bmbt_buf_ops); | |
426 | if (error) | |
427 | return error; | |
428 | *count += 1; | |
429 | block = XFS_BUF_TO_BLOCK(bp); | |
430 | } | |
431 | } | |
432 | return 0; | |
433 | } | |
434 | ||
435 | /* | |
436 | * Count fsblocks of the given fork. | |
437 | */ | |
438 | int /* error */ | |
439 | xfs_bmap_count_blocks( | |
440 | xfs_trans_t *tp, /* transaction pointer */ | |
441 | xfs_inode_t *ip, /* incore inode */ | |
442 | int whichfork, /* data or attr fork */ | |
443 | int *count) /* out: count of blocks */ | |
444 | { | |
445 | struct xfs_btree_block *block; /* current btree block */ | |
446 | xfs_fsblock_t bno; /* block # of "block" */ | |
447 | xfs_ifork_t *ifp; /* fork structure */ | |
448 | int level; /* btree level, for checking */ | |
449 | xfs_mount_t *mp; /* file system mount structure */ | |
450 | __be64 *pp; /* pointer to block address */ | |
451 | ||
452 | bno = NULLFSBLOCK; | |
453 | mp = ip->i_mount; | |
454 | ifp = XFS_IFORK_PTR(ip, whichfork); | |
455 | if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) { | |
456 | xfs_bmap_count_leaves(ifp, 0, | |
457 | ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t), | |
458 | count); | |
459 | return 0; | |
460 | } | |
461 | ||
462 | /* | |
463 | * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out. | |
464 | */ | |
465 | block = ifp->if_broot; | |
466 | level = be16_to_cpu(block->bb_level); | |
467 | ASSERT(level > 0); | |
468 | pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes); | |
469 | bno = be64_to_cpu(*pp); | |
470 | ASSERT(bno != NULLDFSBNO); | |
471 | ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount); | |
472 | ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks); | |
473 | ||
474 | if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) { | |
475 | XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW, | |
476 | mp); | |
477 | return XFS_ERROR(EFSCORRUPTED); | |
478 | } | |
479 | ||
480 | return 0; | |
481 | } | |
482 | ||
483 | /* | |
484 | * returns 1 for success, 0 if we failed to map the extent. | |
485 | */ | |
486 | STATIC int | |
487 | xfs_getbmapx_fix_eof_hole( | |
488 | xfs_inode_t *ip, /* xfs incore inode pointer */ | |
489 | struct getbmapx *out, /* output structure */ | |
490 | int prealloced, /* this is a file with | |
491 | * preallocated data space */ | |
492 | __int64_t end, /* last block requested */ | |
493 | xfs_fsblock_t startblock) | |
494 | { | |
495 | __int64_t fixlen; | |
496 | xfs_mount_t *mp; /* file system mount point */ | |
497 | xfs_ifork_t *ifp; /* inode fork pointer */ | |
498 | xfs_extnum_t lastx; /* last extent pointer */ | |
499 | xfs_fileoff_t fileblock; | |
500 | ||
501 | if (startblock == HOLESTARTBLOCK) { | |
502 | mp = ip->i_mount; | |
503 | out->bmv_block = -1; | |
504 | fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, XFS_ISIZE(ip))); | |
505 | fixlen -= out->bmv_offset; | |
506 | if (prealloced && out->bmv_offset + out->bmv_length == end) { | |
507 | /* Came to hole at EOF. Trim it. */ | |
508 | if (fixlen <= 0) | |
509 | return 0; | |
510 | out->bmv_length = fixlen; | |
511 | } | |
512 | } else { | |
513 | if (startblock == DELAYSTARTBLOCK) | |
514 | out->bmv_block = -2; | |
515 | else | |
516 | out->bmv_block = xfs_fsb_to_db(ip, startblock); | |
517 | fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset); | |
518 | ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); | |
519 | if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) && | |
520 | (lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1)) | |
521 | out->bmv_oflags |= BMV_OF_LAST; | |
522 | } | |
523 | ||
524 | return 1; | |
525 | } | |
526 | ||
527 | /* | |
528 | * Get inode's extents as described in bmv, and format for output. | |
529 | * Calls formatter to fill the user's buffer until all extents | |
530 | * are mapped, until the passed-in bmv->bmv_count slots have | |
531 | * been filled, or until the formatter short-circuits the loop, | |
532 | * if it is tracking filled-in extents on its own. | |
533 | */ | |
534 | int /* error code */ | |
535 | xfs_getbmap( | |
536 | xfs_inode_t *ip, | |
537 | struct getbmapx *bmv, /* user bmap structure */ | |
538 | xfs_bmap_format_t formatter, /* format to user */ | |
539 | void *arg) /* formatter arg */ | |
540 | { | |
541 | __int64_t bmvend; /* last block requested */ | |
542 | int error = 0; /* return value */ | |
543 | __int64_t fixlen; /* length for -1 case */ | |
544 | int i; /* extent number */ | |
545 | int lock; /* lock state */ | |
546 | xfs_bmbt_irec_t *map; /* buffer for user's data */ | |
547 | xfs_mount_t *mp; /* file system mount point */ | |
548 | int nex; /* # of user extents can do */ | |
549 | int nexleft; /* # of user extents left */ | |
550 | int subnex; /* # of bmapi's can do */ | |
551 | int nmap; /* number of map entries */ | |
552 | struct getbmapx *out; /* output structure */ | |
553 | int whichfork; /* data or attr fork */ | |
554 | int prealloced; /* this is a file with | |
555 | * preallocated data space */ | |
556 | int iflags; /* interface flags */ | |
557 | int bmapi_flags; /* flags for xfs_bmapi */ | |
558 | int cur_ext = 0; | |
559 | ||
560 | mp = ip->i_mount; | |
561 | iflags = bmv->bmv_iflags; | |
562 | whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK; | |
563 | ||
564 | if (whichfork == XFS_ATTR_FORK) { | |
565 | if (XFS_IFORK_Q(ip)) { | |
566 | if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS && | |
567 | ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE && | |
568 | ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL) | |
569 | return XFS_ERROR(EINVAL); | |
570 | } else if (unlikely( | |
571 | ip->i_d.di_aformat != 0 && | |
572 | ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) { | |
573 | XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW, | |
574 | ip->i_mount); | |
575 | return XFS_ERROR(EFSCORRUPTED); | |
576 | } | |
577 | ||
578 | prealloced = 0; | |
579 | fixlen = 1LL << 32; | |
580 | } else { | |
581 | if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS && | |
582 | ip->i_d.di_format != XFS_DINODE_FMT_BTREE && | |
583 | ip->i_d.di_format != XFS_DINODE_FMT_LOCAL) | |
584 | return XFS_ERROR(EINVAL); | |
585 | ||
586 | if (xfs_get_extsz_hint(ip) || | |
587 | ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){ | |
588 | prealloced = 1; | |
589 | fixlen = mp->m_super->s_maxbytes; | |
590 | } else { | |
591 | prealloced = 0; | |
592 | fixlen = XFS_ISIZE(ip); | |
593 | } | |
594 | } | |
595 | ||
596 | if (bmv->bmv_length == -1) { | |
597 | fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen)); | |
598 | bmv->bmv_length = | |
599 | max_t(__int64_t, fixlen - bmv->bmv_offset, 0); | |
600 | } else if (bmv->bmv_length == 0) { | |
601 | bmv->bmv_entries = 0; | |
602 | return 0; | |
603 | } else if (bmv->bmv_length < 0) { | |
604 | return XFS_ERROR(EINVAL); | |
605 | } | |
606 | ||
607 | nex = bmv->bmv_count - 1; | |
608 | if (nex <= 0) | |
609 | return XFS_ERROR(EINVAL); | |
610 | bmvend = bmv->bmv_offset + bmv->bmv_length; | |
611 | ||
612 | ||
613 | if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx)) | |
614 | return XFS_ERROR(ENOMEM); | |
fdd3ccee DC |
615 | out = kmem_zalloc_large(bmv->bmv_count * sizeof(struct getbmapx), 0); |
616 | if (!out) | |
617 | return XFS_ERROR(ENOMEM); | |
68988114 DC |
618 | |
619 | xfs_ilock(ip, XFS_IOLOCK_SHARED); | |
620 | if (whichfork == XFS_DATA_FORK && !(iflags & BMV_IF_DELALLOC)) { | |
621 | if (ip->i_delayed_blks || XFS_ISIZE(ip) > ip->i_d.di_size) { | |
622 | error = -filemap_write_and_wait(VFS_I(ip)->i_mapping); | |
623 | if (error) | |
624 | goto out_unlock_iolock; | |
625 | } | |
626 | /* | |
627 | * even after flushing the inode, there can still be delalloc | |
628 | * blocks on the inode beyond EOF due to speculative | |
629 | * preallocation. These are not removed until the release | |
630 | * function is called or the inode is inactivated. Hence we | |
631 | * cannot assert here that ip->i_delayed_blks == 0. | |
632 | */ | |
633 | } | |
634 | ||
635 | lock = xfs_ilock_map_shared(ip); | |
636 | ||
637 | /* | |
638 | * Don't let nex be bigger than the number of extents | |
639 | * we can have assuming alternating holes and real extents. | |
640 | */ | |
641 | if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1) | |
642 | nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1; | |
643 | ||
644 | bmapi_flags = xfs_bmapi_aflag(whichfork); | |
645 | if (!(iflags & BMV_IF_PREALLOC)) | |
646 | bmapi_flags |= XFS_BMAPI_IGSTATE; | |
647 | ||
648 | /* | |
649 | * Allocate enough space to handle "subnex" maps at a time. | |
650 | */ | |
651 | error = ENOMEM; | |
652 | subnex = 16; | |
653 | map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS); | |
654 | if (!map) | |
655 | goto out_unlock_ilock; | |
656 | ||
657 | bmv->bmv_entries = 0; | |
658 | ||
659 | if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 && | |
660 | (whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) { | |
661 | error = 0; | |
662 | goto out_free_map; | |
663 | } | |
664 | ||
665 | nexleft = nex; | |
666 | ||
667 | do { | |
668 | nmap = (nexleft > subnex) ? subnex : nexleft; | |
669 | error = xfs_bmapi_read(ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset), | |
670 | XFS_BB_TO_FSB(mp, bmv->bmv_length), | |
671 | map, &nmap, bmapi_flags); | |
672 | if (error) | |
673 | goto out_free_map; | |
674 | ASSERT(nmap <= subnex); | |
675 | ||
676 | for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) { | |
677 | out[cur_ext].bmv_oflags = 0; | |
678 | if (map[i].br_state == XFS_EXT_UNWRITTEN) | |
679 | out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC; | |
680 | else if (map[i].br_startblock == DELAYSTARTBLOCK) | |
681 | out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC; | |
682 | out[cur_ext].bmv_offset = | |
683 | XFS_FSB_TO_BB(mp, map[i].br_startoff); | |
684 | out[cur_ext].bmv_length = | |
685 | XFS_FSB_TO_BB(mp, map[i].br_blockcount); | |
686 | out[cur_ext].bmv_unused1 = 0; | |
687 | out[cur_ext].bmv_unused2 = 0; | |
688 | ||
689 | /* | |
690 | * delayed allocation extents that start beyond EOF can | |
691 | * occur due to speculative EOF allocation when the | |
692 | * delalloc extent is larger than the largest freespace | |
693 | * extent at conversion time. These extents cannot be | |
694 | * converted by data writeback, so can exist here even | |
695 | * if we are not supposed to be finding delalloc | |
696 | * extents. | |
697 | */ | |
698 | if (map[i].br_startblock == DELAYSTARTBLOCK && | |
699 | map[i].br_startoff <= XFS_B_TO_FSB(mp, XFS_ISIZE(ip))) | |
700 | ASSERT((iflags & BMV_IF_DELALLOC) != 0); | |
701 | ||
702 | if (map[i].br_startblock == HOLESTARTBLOCK && | |
703 | whichfork == XFS_ATTR_FORK) { | |
704 | /* came to the end of attribute fork */ | |
705 | out[cur_ext].bmv_oflags |= BMV_OF_LAST; | |
706 | goto out_free_map; | |
707 | } | |
708 | ||
709 | if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext], | |
710 | prealloced, bmvend, | |
711 | map[i].br_startblock)) | |
712 | goto out_free_map; | |
713 | ||
714 | bmv->bmv_offset = | |
715 | out[cur_ext].bmv_offset + | |
716 | out[cur_ext].bmv_length; | |
717 | bmv->bmv_length = | |
718 | max_t(__int64_t, 0, bmvend - bmv->bmv_offset); | |
719 | ||
720 | /* | |
721 | * In case we don't want to return the hole, | |
722 | * don't increase cur_ext so that we can reuse | |
723 | * it in the next loop. | |
724 | */ | |
725 | if ((iflags & BMV_IF_NO_HOLES) && | |
726 | map[i].br_startblock == HOLESTARTBLOCK) { | |
727 | memset(&out[cur_ext], 0, sizeof(out[cur_ext])); | |
728 | continue; | |
729 | } | |
730 | ||
731 | nexleft--; | |
732 | bmv->bmv_entries++; | |
733 | cur_ext++; | |
734 | } | |
735 | } while (nmap && nexleft && bmv->bmv_length); | |
736 | ||
737 | out_free_map: | |
738 | kmem_free(map); | |
739 | out_unlock_ilock: | |
740 | xfs_iunlock_map_shared(ip, lock); | |
741 | out_unlock_iolock: | |
742 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
743 | ||
744 | for (i = 0; i < cur_ext; i++) { | |
745 | int full = 0; /* user array is full */ | |
746 | ||
747 | /* format results & advance arg */ | |
748 | error = formatter(&arg, &out[i], &full); | |
749 | if (error || full) | |
750 | break; | |
751 | } | |
752 | ||
fdd3ccee | 753 | kmem_free(out); |
68988114 DC |
754 | return error; |
755 | } | |
756 | ||
757 | /* | |
758 | * dead simple method of punching delalyed allocation blocks from a range in | |
759 | * the inode. Walks a block at a time so will be slow, but is only executed in | |
ad4809bf | 760 | * rare error cases so the overhead is not critical. This will always punch out |
68988114 DC |
761 | * both the start and end blocks, even if the ranges only partially overlap |
762 | * them, so it is up to the caller to ensure that partial blocks are not | |
763 | * passed in. | |
764 | */ | |
765 | int | |
766 | xfs_bmap_punch_delalloc_range( | |
767 | struct xfs_inode *ip, | |
768 | xfs_fileoff_t start_fsb, | |
769 | xfs_fileoff_t length) | |
770 | { | |
771 | xfs_fileoff_t remaining = length; | |
772 | int error = 0; | |
773 | ||
774 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); | |
775 | ||
776 | do { | |
777 | int done; | |
778 | xfs_bmbt_irec_t imap; | |
779 | int nimaps = 1; | |
780 | xfs_fsblock_t firstblock; | |
781 | xfs_bmap_free_t flist; | |
782 | ||
783 | /* | |
784 | * Map the range first and check that it is a delalloc extent | |
785 | * before trying to unmap the range. Otherwise we will be | |
786 | * trying to remove a real extent (which requires a | |
787 | * transaction) or a hole, which is probably a bad idea... | |
788 | */ | |
789 | error = xfs_bmapi_read(ip, start_fsb, 1, &imap, &nimaps, | |
790 | XFS_BMAPI_ENTIRE); | |
791 | ||
792 | if (error) { | |
793 | /* something screwed, just bail */ | |
794 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { | |
795 | xfs_alert(ip->i_mount, | |
796 | "Failed delalloc mapping lookup ino %lld fsb %lld.", | |
797 | ip->i_ino, start_fsb); | |
798 | } | |
799 | break; | |
800 | } | |
801 | if (!nimaps) { | |
802 | /* nothing there */ | |
803 | goto next_block; | |
804 | } | |
805 | if (imap.br_startblock != DELAYSTARTBLOCK) { | |
806 | /* been converted, ignore */ | |
807 | goto next_block; | |
808 | } | |
809 | WARN_ON(imap.br_blockcount == 0); | |
810 | ||
811 | /* | |
812 | * Note: while we initialise the firstblock/flist pair, they | |
813 | * should never be used because blocks should never be | |
814 | * allocated or freed for a delalloc extent and hence we need | |
815 | * don't cancel or finish them after the xfs_bunmapi() call. | |
816 | */ | |
817 | xfs_bmap_init(&flist, &firstblock); | |
818 | error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock, | |
819 | &flist, &done); | |
820 | if (error) | |
821 | break; | |
822 | ||
823 | ASSERT(!flist.xbf_count && !flist.xbf_first); | |
824 | next_block: | |
825 | start_fsb++; | |
826 | remaining--; | |
827 | } while(remaining > 0); | |
828 | ||
829 | return error; | |
830 | } | |
c24b5dfa DC |
831 | |
832 | /* | |
833 | * Test whether it is appropriate to check an inode for and free post EOF | |
834 | * blocks. The 'force' parameter determines whether we should also consider | |
835 | * regular files that are marked preallocated or append-only. | |
836 | */ | |
837 | bool | |
838 | xfs_can_free_eofblocks(struct xfs_inode *ip, bool force) | |
839 | { | |
840 | /* prealloc/delalloc exists only on regular files */ | |
841 | if (!S_ISREG(ip->i_d.di_mode)) | |
842 | return false; | |
843 | ||
844 | /* | |
845 | * Zero sized files with no cached pages and delalloc blocks will not | |
846 | * have speculative prealloc/delalloc blocks to remove. | |
847 | */ | |
848 | if (VFS_I(ip)->i_size == 0 && | |
849 | VN_CACHED(VFS_I(ip)) == 0 && | |
850 | ip->i_delayed_blks == 0) | |
851 | return false; | |
852 | ||
853 | /* If we haven't read in the extent list, then don't do it now. */ | |
854 | if (!(ip->i_df.if_flags & XFS_IFEXTENTS)) | |
855 | return false; | |
856 | ||
857 | /* | |
858 | * Do not free real preallocated or append-only files unless the file | |
859 | * has delalloc blocks and we are forced to remove them. | |
860 | */ | |
861 | if (ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) | |
862 | if (!force || ip->i_delayed_blks == 0) | |
863 | return false; | |
864 | ||
865 | return true; | |
866 | } | |
867 | ||
868 | /* | |
869 | * This is called by xfs_inactive to free any blocks beyond eof | |
870 | * when the link count isn't zero and by xfs_dm_punch_hole() when | |
871 | * punching a hole to EOF. | |
872 | */ | |
873 | int | |
874 | xfs_free_eofblocks( | |
875 | xfs_mount_t *mp, | |
876 | xfs_inode_t *ip, | |
877 | bool need_iolock) | |
878 | { | |
879 | xfs_trans_t *tp; | |
880 | int error; | |
881 | xfs_fileoff_t end_fsb; | |
882 | xfs_fileoff_t last_fsb; | |
883 | xfs_filblks_t map_len; | |
884 | int nimaps; | |
885 | xfs_bmbt_irec_t imap; | |
886 | ||
887 | /* | |
888 | * Figure out if there are any blocks beyond the end | |
889 | * of the file. If not, then there is nothing to do. | |
890 | */ | |
891 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip)); | |
892 | last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); | |
893 | if (last_fsb <= end_fsb) | |
894 | return 0; | |
895 | map_len = last_fsb - end_fsb; | |
896 | ||
897 | nimaps = 1; | |
898 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
899 | error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0); | |
900 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
901 | ||
902 | if (!error && (nimaps != 0) && | |
903 | (imap.br_startblock != HOLESTARTBLOCK || | |
904 | ip->i_delayed_blks)) { | |
905 | /* | |
906 | * Attach the dquots to the inode up front. | |
907 | */ | |
908 | error = xfs_qm_dqattach(ip, 0); | |
909 | if (error) | |
910 | return error; | |
911 | ||
912 | /* | |
913 | * There are blocks after the end of file. | |
914 | * Free them up now by truncating the file to | |
915 | * its current size. | |
916 | */ | |
917 | tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); | |
918 | ||
919 | if (need_iolock) { | |
920 | if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) { | |
921 | xfs_trans_cancel(tp, 0); | |
922 | return EAGAIN; | |
923 | } | |
924 | } | |
925 | ||
3d3c8b52 | 926 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0); |
c24b5dfa DC |
927 | if (error) { |
928 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
929 | xfs_trans_cancel(tp, 0); | |
930 | if (need_iolock) | |
931 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
932 | return error; | |
933 | } | |
934 | ||
935 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
936 | xfs_trans_ijoin(tp, ip, 0); | |
937 | ||
938 | /* | |
939 | * Do not update the on-disk file size. If we update the | |
940 | * on-disk file size and then the system crashes before the | |
941 | * contents of the file are flushed to disk then the files | |
942 | * may be full of holes (ie NULL files bug). | |
943 | */ | |
944 | error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, | |
945 | XFS_ISIZE(ip)); | |
946 | if (error) { | |
947 | /* | |
948 | * If we get an error at this point we simply don't | |
949 | * bother truncating the file. | |
950 | */ | |
951 | xfs_trans_cancel(tp, | |
952 | (XFS_TRANS_RELEASE_LOG_RES | | |
953 | XFS_TRANS_ABORT)); | |
954 | } else { | |
955 | error = xfs_trans_commit(tp, | |
956 | XFS_TRANS_RELEASE_LOG_RES); | |
957 | if (!error) | |
958 | xfs_inode_clear_eofblocks_tag(ip); | |
959 | } | |
960 | ||
961 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
962 | if (need_iolock) | |
963 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
964 | } | |
965 | return error; | |
966 | } | |
967 | ||
968 | /* | |
969 | * xfs_alloc_file_space() | |
970 | * This routine allocates disk space for the given file. | |
971 | * | |
972 | * If alloc_type == 0, this request is for an ALLOCSP type | |
973 | * request which will change the file size. In this case, no | |
974 | * DMAPI event will be generated by the call. A TRUNCATE event | |
975 | * will be generated later by xfs_setattr. | |
976 | * | |
977 | * If alloc_type != 0, this request is for a RESVSP type | |
978 | * request, and a DMAPI DM_EVENT_WRITE will be generated if the | |
979 | * lower block boundary byte address is less than the file's | |
980 | * length. | |
981 | * | |
982 | * RETURNS: | |
983 | * 0 on success | |
984 | * errno on error | |
985 | * | |
986 | */ | |
987 | STATIC int | |
988 | xfs_alloc_file_space( | |
989 | xfs_inode_t *ip, | |
990 | xfs_off_t offset, | |
991 | xfs_off_t len, | |
992 | int alloc_type, | |
993 | int attr_flags) | |
994 | { | |
995 | xfs_mount_t *mp = ip->i_mount; | |
996 | xfs_off_t count; | |
997 | xfs_filblks_t allocated_fsb; | |
998 | xfs_filblks_t allocatesize_fsb; | |
999 | xfs_extlen_t extsz, temp; | |
1000 | xfs_fileoff_t startoffset_fsb; | |
1001 | xfs_fsblock_t firstfsb; | |
1002 | int nimaps; | |
1003 | int quota_flag; | |
1004 | int rt; | |
1005 | xfs_trans_t *tp; | |
1006 | xfs_bmbt_irec_t imaps[1], *imapp; | |
1007 | xfs_bmap_free_t free_list; | |
1008 | uint qblocks, resblks, resrtextents; | |
1009 | int committed; | |
1010 | int error; | |
1011 | ||
1012 | trace_xfs_alloc_file_space(ip); | |
1013 | ||
1014 | if (XFS_FORCED_SHUTDOWN(mp)) | |
1015 | return XFS_ERROR(EIO); | |
1016 | ||
1017 | error = xfs_qm_dqattach(ip, 0); | |
1018 | if (error) | |
1019 | return error; | |
1020 | ||
1021 | if (len <= 0) | |
1022 | return XFS_ERROR(EINVAL); | |
1023 | ||
1024 | rt = XFS_IS_REALTIME_INODE(ip); | |
1025 | extsz = xfs_get_extsz_hint(ip); | |
1026 | ||
1027 | count = len; | |
1028 | imapp = &imaps[0]; | |
1029 | nimaps = 1; | |
1030 | startoffset_fsb = XFS_B_TO_FSBT(mp, offset); | |
1031 | allocatesize_fsb = XFS_B_TO_FSB(mp, count); | |
1032 | ||
1033 | /* | |
1034 | * Allocate file space until done or until there is an error | |
1035 | */ | |
1036 | while (allocatesize_fsb && !error) { | |
1037 | xfs_fileoff_t s, e; | |
1038 | ||
1039 | /* | |
1040 | * Determine space reservations for data/realtime. | |
1041 | */ | |
1042 | if (unlikely(extsz)) { | |
1043 | s = startoffset_fsb; | |
1044 | do_div(s, extsz); | |
1045 | s *= extsz; | |
1046 | e = startoffset_fsb + allocatesize_fsb; | |
1047 | if ((temp = do_mod(startoffset_fsb, extsz))) | |
1048 | e += temp; | |
1049 | if ((temp = do_mod(e, extsz))) | |
1050 | e += extsz - temp; | |
1051 | } else { | |
1052 | s = 0; | |
1053 | e = allocatesize_fsb; | |
1054 | } | |
1055 | ||
1056 | /* | |
1057 | * The transaction reservation is limited to a 32-bit block | |
1058 | * count, hence we need to limit the number of blocks we are | |
1059 | * trying to reserve to avoid an overflow. We can't allocate | |
1060 | * more than @nimaps extents, and an extent is limited on disk | |
1061 | * to MAXEXTLEN (21 bits), so use that to enforce the limit. | |
1062 | */ | |
1063 | resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps)); | |
1064 | if (unlikely(rt)) { | |
1065 | resrtextents = qblocks = resblks; | |
1066 | resrtextents /= mp->m_sb.sb_rextsize; | |
1067 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); | |
1068 | quota_flag = XFS_QMOPT_RES_RTBLKS; | |
1069 | } else { | |
1070 | resrtextents = 0; | |
1071 | resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks); | |
1072 | quota_flag = XFS_QMOPT_RES_REGBLKS; | |
1073 | } | |
1074 | ||
1075 | /* | |
1076 | * Allocate and setup the transaction. | |
1077 | */ | |
1078 | tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); | |
3d3c8b52 JL |
1079 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write, |
1080 | resblks, resrtextents); | |
c24b5dfa DC |
1081 | /* |
1082 | * Check for running out of space | |
1083 | */ | |
1084 | if (error) { | |
1085 | /* | |
1086 | * Free the transaction structure. | |
1087 | */ | |
1088 | ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp)); | |
1089 | xfs_trans_cancel(tp, 0); | |
1090 | break; | |
1091 | } | |
1092 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1093 | error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, | |
1094 | 0, quota_flag); | |
1095 | if (error) | |
1096 | goto error1; | |
1097 | ||
1098 | xfs_trans_ijoin(tp, ip, 0); | |
1099 | ||
1100 | xfs_bmap_init(&free_list, &firstfsb); | |
1101 | error = xfs_bmapi_write(tp, ip, startoffset_fsb, | |
1102 | allocatesize_fsb, alloc_type, &firstfsb, | |
1103 | 0, imapp, &nimaps, &free_list); | |
1104 | if (error) { | |
1105 | goto error0; | |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * Complete the transaction | |
1110 | */ | |
1111 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
1112 | if (error) { | |
1113 | goto error0; | |
1114 | } | |
1115 | ||
1116 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); | |
1117 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1118 | if (error) { | |
1119 | break; | |
1120 | } | |
1121 | ||
1122 | allocated_fsb = imapp->br_blockcount; | |
1123 | ||
1124 | if (nimaps == 0) { | |
1125 | error = XFS_ERROR(ENOSPC); | |
1126 | break; | |
1127 | } | |
1128 | ||
1129 | startoffset_fsb += allocated_fsb; | |
1130 | allocatesize_fsb -= allocated_fsb; | |
1131 | } | |
1132 | ||
1133 | return error; | |
1134 | ||
1135 | error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ | |
1136 | xfs_bmap_cancel(&free_list); | |
1137 | xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag); | |
1138 | ||
1139 | error1: /* Just cancel transaction */ | |
1140 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
1141 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1142 | return error; | |
1143 | } | |
1144 | ||
1145 | /* | |
1146 | * Zero file bytes between startoff and endoff inclusive. | |
1147 | * The iolock is held exclusive and no blocks are buffered. | |
1148 | * | |
1149 | * This function is used by xfs_free_file_space() to zero | |
1150 | * partial blocks when the range to free is not block aligned. | |
1151 | * When unreserving space with boundaries that are not block | |
1152 | * aligned we round up the start and round down the end | |
1153 | * boundaries and then use this function to zero the parts of | |
1154 | * the blocks that got dropped during the rounding. | |
1155 | */ | |
1156 | STATIC int | |
1157 | xfs_zero_remaining_bytes( | |
1158 | xfs_inode_t *ip, | |
1159 | xfs_off_t startoff, | |
1160 | xfs_off_t endoff) | |
1161 | { | |
1162 | xfs_bmbt_irec_t imap; | |
1163 | xfs_fileoff_t offset_fsb; | |
1164 | xfs_off_t lastoffset; | |
1165 | xfs_off_t offset; | |
1166 | xfs_buf_t *bp; | |
1167 | xfs_mount_t *mp = ip->i_mount; | |
1168 | int nimap; | |
1169 | int error = 0; | |
1170 | ||
1171 | /* | |
1172 | * Avoid doing I/O beyond eof - it's not necessary | |
1173 | * since nothing can read beyond eof. The space will | |
1174 | * be zeroed when the file is extended anyway. | |
1175 | */ | |
1176 | if (startoff >= XFS_ISIZE(ip)) | |
1177 | return 0; | |
1178 | ||
1179 | if (endoff > XFS_ISIZE(ip)) | |
1180 | endoff = XFS_ISIZE(ip); | |
1181 | ||
1182 | bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ? | |
1183 | mp->m_rtdev_targp : mp->m_ddev_targp, | |
1184 | BTOBB(mp->m_sb.sb_blocksize), 0); | |
1185 | if (!bp) | |
1186 | return XFS_ERROR(ENOMEM); | |
1187 | ||
1188 | xfs_buf_unlock(bp); | |
1189 | ||
1190 | for (offset = startoff; offset <= endoff; offset = lastoffset + 1) { | |
1191 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
1192 | nimap = 1; | |
1193 | error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0); | |
1194 | if (error || nimap < 1) | |
1195 | break; | |
1196 | ASSERT(imap.br_blockcount >= 1); | |
1197 | ASSERT(imap.br_startoff == offset_fsb); | |
1198 | lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1; | |
1199 | if (lastoffset > endoff) | |
1200 | lastoffset = endoff; | |
1201 | if (imap.br_startblock == HOLESTARTBLOCK) | |
1202 | continue; | |
1203 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); | |
1204 | if (imap.br_state == XFS_EXT_UNWRITTEN) | |
1205 | continue; | |
1206 | XFS_BUF_UNDONE(bp); | |
1207 | XFS_BUF_UNWRITE(bp); | |
1208 | XFS_BUF_READ(bp); | |
1209 | XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock)); | |
1210 | xfsbdstrat(mp, bp); | |
1211 | error = xfs_buf_iowait(bp); | |
1212 | if (error) { | |
1213 | xfs_buf_ioerror_alert(bp, | |
1214 | "xfs_zero_remaining_bytes(read)"); | |
1215 | break; | |
1216 | } | |
1217 | memset(bp->b_addr + | |
1218 | (offset - XFS_FSB_TO_B(mp, imap.br_startoff)), | |
1219 | 0, lastoffset - offset + 1); | |
1220 | XFS_BUF_UNDONE(bp); | |
1221 | XFS_BUF_UNREAD(bp); | |
1222 | XFS_BUF_WRITE(bp); | |
1223 | xfsbdstrat(mp, bp); | |
1224 | error = xfs_buf_iowait(bp); | |
1225 | if (error) { | |
1226 | xfs_buf_ioerror_alert(bp, | |
1227 | "xfs_zero_remaining_bytes(write)"); | |
1228 | break; | |
1229 | } | |
1230 | } | |
1231 | xfs_buf_free(bp); | |
1232 | return error; | |
1233 | } | |
1234 | ||
1235 | /* | |
1236 | * xfs_free_file_space() | |
1237 | * This routine frees disk space for the given file. | |
1238 | * | |
1239 | * This routine is only called by xfs_change_file_space | |
1240 | * for an UNRESVSP type call. | |
1241 | * | |
1242 | * RETURNS: | |
1243 | * 0 on success | |
1244 | * errno on error | |
1245 | * | |
1246 | */ | |
1247 | STATIC int | |
1248 | xfs_free_file_space( | |
1249 | xfs_inode_t *ip, | |
1250 | xfs_off_t offset, | |
1251 | xfs_off_t len, | |
1252 | int attr_flags) | |
1253 | { | |
1254 | int committed; | |
1255 | int done; | |
1256 | xfs_fileoff_t endoffset_fsb; | |
1257 | int error; | |
1258 | xfs_fsblock_t firstfsb; | |
1259 | xfs_bmap_free_t free_list; | |
1260 | xfs_bmbt_irec_t imap; | |
1261 | xfs_off_t ioffset; | |
1262 | xfs_extlen_t mod=0; | |
1263 | xfs_mount_t *mp; | |
1264 | int nimap; | |
1265 | uint resblks; | |
1266 | xfs_off_t rounding; | |
1267 | int rt; | |
1268 | xfs_fileoff_t startoffset_fsb; | |
1269 | xfs_trans_t *tp; | |
1270 | int need_iolock = 1; | |
1271 | ||
1272 | mp = ip->i_mount; | |
1273 | ||
1274 | trace_xfs_free_file_space(ip); | |
1275 | ||
1276 | error = xfs_qm_dqattach(ip, 0); | |
1277 | if (error) | |
1278 | return error; | |
1279 | ||
1280 | error = 0; | |
1281 | if (len <= 0) /* if nothing being freed */ | |
1282 | return error; | |
1283 | rt = XFS_IS_REALTIME_INODE(ip); | |
1284 | startoffset_fsb = XFS_B_TO_FSB(mp, offset); | |
1285 | endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len); | |
1286 | ||
1287 | if (attr_flags & XFS_ATTR_NOLOCK) | |
1288 | need_iolock = 0; | |
1289 | if (need_iolock) { | |
1290 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
1291 | /* wait for the completion of any pending DIOs */ | |
1292 | inode_dio_wait(VFS_I(ip)); | |
1293 | } | |
1294 | ||
1295 | rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE); | |
1296 | ioffset = offset & ~(rounding - 1); | |
1297 | error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping, | |
1298 | ioffset, -1); | |
1299 | if (error) | |
1300 | goto out_unlock_iolock; | |
1301 | truncate_pagecache_range(VFS_I(ip), ioffset, -1); | |
1302 | ||
1303 | /* | |
1304 | * Need to zero the stuff we're not freeing, on disk. | |
1305 | * If it's a realtime file & can't use unwritten extents then we | |
1306 | * actually need to zero the extent edges. Otherwise xfs_bunmapi | |
1307 | * will take care of it for us. | |
1308 | */ | |
1309 | if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) { | |
1310 | nimap = 1; | |
1311 | error = xfs_bmapi_read(ip, startoffset_fsb, 1, | |
1312 | &imap, &nimap, 0); | |
1313 | if (error) | |
1314 | goto out_unlock_iolock; | |
1315 | ASSERT(nimap == 0 || nimap == 1); | |
1316 | if (nimap && imap.br_startblock != HOLESTARTBLOCK) { | |
1317 | xfs_daddr_t block; | |
1318 | ||
1319 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); | |
1320 | block = imap.br_startblock; | |
1321 | mod = do_div(block, mp->m_sb.sb_rextsize); | |
1322 | if (mod) | |
1323 | startoffset_fsb += mp->m_sb.sb_rextsize - mod; | |
1324 | } | |
1325 | nimap = 1; | |
1326 | error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1, | |
1327 | &imap, &nimap, 0); | |
1328 | if (error) | |
1329 | goto out_unlock_iolock; | |
1330 | ASSERT(nimap == 0 || nimap == 1); | |
1331 | if (nimap && imap.br_startblock != HOLESTARTBLOCK) { | |
1332 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); | |
1333 | mod++; | |
1334 | if (mod && (mod != mp->m_sb.sb_rextsize)) | |
1335 | endoffset_fsb -= mod; | |
1336 | } | |
1337 | } | |
1338 | if ((done = (endoffset_fsb <= startoffset_fsb))) | |
1339 | /* | |
1340 | * One contiguous piece to clear | |
1341 | */ | |
1342 | error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1); | |
1343 | else { | |
1344 | /* | |
1345 | * Some full blocks, possibly two pieces to clear | |
1346 | */ | |
1347 | if (offset < XFS_FSB_TO_B(mp, startoffset_fsb)) | |
1348 | error = xfs_zero_remaining_bytes(ip, offset, | |
1349 | XFS_FSB_TO_B(mp, startoffset_fsb) - 1); | |
1350 | if (!error && | |
1351 | XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len) | |
1352 | error = xfs_zero_remaining_bytes(ip, | |
1353 | XFS_FSB_TO_B(mp, endoffset_fsb), | |
1354 | offset + len - 1); | |
1355 | } | |
1356 | ||
1357 | /* | |
1358 | * free file space until done or until there is an error | |
1359 | */ | |
1360 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); | |
1361 | while (!error && !done) { | |
1362 | ||
1363 | /* | |
1364 | * allocate and setup the transaction. Allow this | |
1365 | * transaction to dip into the reserve blocks to ensure | |
1366 | * the freeing of the space succeeds at ENOSPC. | |
1367 | */ | |
1368 | tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); | |
1369 | tp->t_flags |= XFS_TRANS_RESERVE; | |
3d3c8b52 | 1370 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write, resblks, 0); |
c24b5dfa DC |
1371 | |
1372 | /* | |
1373 | * check for running out of space | |
1374 | */ | |
1375 | if (error) { | |
1376 | /* | |
1377 | * Free the transaction structure. | |
1378 | */ | |
1379 | ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp)); | |
1380 | xfs_trans_cancel(tp, 0); | |
1381 | break; | |
1382 | } | |
1383 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1384 | error = xfs_trans_reserve_quota(tp, mp, | |
1385 | ip->i_udquot, ip->i_gdquot, ip->i_pdquot, | |
1386 | resblks, 0, XFS_QMOPT_RES_REGBLKS); | |
1387 | if (error) | |
1388 | goto error1; | |
1389 | ||
1390 | xfs_trans_ijoin(tp, ip, 0); | |
1391 | ||
1392 | /* | |
1393 | * issue the bunmapi() call to free the blocks | |
1394 | */ | |
1395 | xfs_bmap_init(&free_list, &firstfsb); | |
1396 | error = xfs_bunmapi(tp, ip, startoffset_fsb, | |
1397 | endoffset_fsb - startoffset_fsb, | |
1398 | 0, 2, &firstfsb, &free_list, &done); | |
1399 | if (error) { | |
1400 | goto error0; | |
1401 | } | |
1402 | ||
1403 | /* | |
1404 | * complete the transaction | |
1405 | */ | |
1406 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
1407 | if (error) { | |
1408 | goto error0; | |
1409 | } | |
1410 | ||
1411 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); | |
1412 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1413 | } | |
1414 | ||
1415 | out_unlock_iolock: | |
1416 | if (need_iolock) | |
1417 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
1418 | return error; | |
1419 | ||
1420 | error0: | |
1421 | xfs_bmap_cancel(&free_list); | |
1422 | error1: | |
1423 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
1424 | xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) : | |
1425 | XFS_ILOCK_EXCL); | |
1426 | return error; | |
1427 | } | |
1428 | ||
1429 | ||
1430 | STATIC int | |
1431 | xfs_zero_file_space( | |
1432 | struct xfs_inode *ip, | |
1433 | xfs_off_t offset, | |
1434 | xfs_off_t len, | |
1435 | int attr_flags) | |
1436 | { | |
1437 | struct xfs_mount *mp = ip->i_mount; | |
1438 | uint granularity; | |
1439 | xfs_off_t start_boundary; | |
1440 | xfs_off_t end_boundary; | |
1441 | int error; | |
1442 | ||
1443 | granularity = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE); | |
1444 | ||
1445 | /* | |
1446 | * Round the range of extents we are going to convert inwards. If the | |
1447 | * offset is aligned, then it doesn't get changed so we zero from the | |
1448 | * start of the block offset points to. | |
1449 | */ | |
1450 | start_boundary = round_up(offset, granularity); | |
1451 | end_boundary = round_down(offset + len, granularity); | |
1452 | ||
1453 | ASSERT(start_boundary >= offset); | |
1454 | ASSERT(end_boundary <= offset + len); | |
1455 | ||
1456 | if (!(attr_flags & XFS_ATTR_NOLOCK)) | |
1457 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
1458 | ||
1459 | if (start_boundary < end_boundary - 1) { | |
1460 | /* punch out the page cache over the conversion range */ | |
1461 | truncate_pagecache_range(VFS_I(ip), start_boundary, | |
1462 | end_boundary - 1); | |
1463 | /* convert the blocks */ | |
1464 | error = xfs_alloc_file_space(ip, start_boundary, | |
1465 | end_boundary - start_boundary - 1, | |
1466 | XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT, | |
1467 | attr_flags); | |
1468 | if (error) | |
1469 | goto out_unlock; | |
1470 | ||
1471 | /* We've handled the interior of the range, now for the edges */ | |
1472 | if (start_boundary != offset) | |
1473 | error = xfs_iozero(ip, offset, start_boundary - offset); | |
1474 | if (error) | |
1475 | goto out_unlock; | |
1476 | ||
1477 | if (end_boundary != offset + len) | |
1478 | error = xfs_iozero(ip, end_boundary, | |
1479 | offset + len - end_boundary); | |
1480 | ||
1481 | } else { | |
1482 | /* | |
1483 | * It's either a sub-granularity range or the range spanned lies | |
1484 | * partially across two adjacent blocks. | |
1485 | */ | |
1486 | error = xfs_iozero(ip, offset, len); | |
1487 | } | |
1488 | ||
1489 | out_unlock: | |
1490 | if (!(attr_flags & XFS_ATTR_NOLOCK)) | |
1491 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
1492 | return error; | |
1493 | ||
1494 | } | |
1495 | ||
1496 | /* | |
1497 | * xfs_change_file_space() | |
1498 | * This routine allocates or frees disk space for the given file. | |
1499 | * The user specified parameters are checked for alignment and size | |
1500 | * limitations. | |
1501 | * | |
1502 | * RETURNS: | |
1503 | * 0 on success | |
1504 | * errno on error | |
1505 | * | |
1506 | */ | |
1507 | int | |
1508 | xfs_change_file_space( | |
1509 | xfs_inode_t *ip, | |
1510 | int cmd, | |
1511 | xfs_flock64_t *bf, | |
1512 | xfs_off_t offset, | |
1513 | int attr_flags) | |
1514 | { | |
1515 | xfs_mount_t *mp = ip->i_mount; | |
1516 | int clrprealloc; | |
1517 | int error; | |
1518 | xfs_fsize_t fsize; | |
1519 | int setprealloc; | |
1520 | xfs_off_t startoffset; | |
1521 | xfs_trans_t *tp; | |
1522 | struct iattr iattr; | |
1523 | ||
1524 | if (!S_ISREG(ip->i_d.di_mode)) | |
1525 | return XFS_ERROR(EINVAL); | |
1526 | ||
1527 | switch (bf->l_whence) { | |
1528 | case 0: /*SEEK_SET*/ | |
1529 | break; | |
1530 | case 1: /*SEEK_CUR*/ | |
1531 | bf->l_start += offset; | |
1532 | break; | |
1533 | case 2: /*SEEK_END*/ | |
1534 | bf->l_start += XFS_ISIZE(ip); | |
1535 | break; | |
1536 | default: | |
1537 | return XFS_ERROR(EINVAL); | |
1538 | } | |
1539 | ||
1540 | /* | |
1541 | * length of <= 0 for resv/unresv/zero is invalid. length for | |
1542 | * alloc/free is ignored completely and we have no idea what userspace | |
1543 | * might have set it to, so set it to zero to allow range | |
1544 | * checks to pass. | |
1545 | */ | |
1546 | switch (cmd) { | |
1547 | case XFS_IOC_ZERO_RANGE: | |
1548 | case XFS_IOC_RESVSP: | |
1549 | case XFS_IOC_RESVSP64: | |
1550 | case XFS_IOC_UNRESVSP: | |
1551 | case XFS_IOC_UNRESVSP64: | |
1552 | if (bf->l_len <= 0) | |
1553 | return XFS_ERROR(EINVAL); | |
1554 | break; | |
1555 | default: | |
1556 | bf->l_len = 0; | |
1557 | break; | |
1558 | } | |
1559 | ||
1560 | if (bf->l_start < 0 || | |
1561 | bf->l_start > mp->m_super->s_maxbytes || | |
1562 | bf->l_start + bf->l_len < 0 || | |
1563 | bf->l_start + bf->l_len >= mp->m_super->s_maxbytes) | |
1564 | return XFS_ERROR(EINVAL); | |
1565 | ||
1566 | bf->l_whence = 0; | |
1567 | ||
1568 | startoffset = bf->l_start; | |
1569 | fsize = XFS_ISIZE(ip); | |
1570 | ||
1571 | setprealloc = clrprealloc = 0; | |
1572 | switch (cmd) { | |
1573 | case XFS_IOC_ZERO_RANGE: | |
1574 | error = xfs_zero_file_space(ip, startoffset, bf->l_len, | |
1575 | attr_flags); | |
1576 | if (error) | |
1577 | return error; | |
1578 | setprealloc = 1; | |
1579 | break; | |
1580 | ||
1581 | case XFS_IOC_RESVSP: | |
1582 | case XFS_IOC_RESVSP64: | |
1583 | error = xfs_alloc_file_space(ip, startoffset, bf->l_len, | |
1584 | XFS_BMAPI_PREALLOC, attr_flags); | |
1585 | if (error) | |
1586 | return error; | |
1587 | setprealloc = 1; | |
1588 | break; | |
1589 | ||
1590 | case XFS_IOC_UNRESVSP: | |
1591 | case XFS_IOC_UNRESVSP64: | |
1592 | if ((error = xfs_free_file_space(ip, startoffset, bf->l_len, | |
1593 | attr_flags))) | |
1594 | return error; | |
1595 | break; | |
1596 | ||
1597 | case XFS_IOC_ALLOCSP: | |
1598 | case XFS_IOC_ALLOCSP64: | |
1599 | case XFS_IOC_FREESP: | |
1600 | case XFS_IOC_FREESP64: | |
1601 | /* | |
1602 | * These operations actually do IO when extending the file, but | |
1603 | * the allocation is done seperately to the zeroing that is | |
1604 | * done. This set of operations need to be serialised against | |
1605 | * other IO operations, such as truncate and buffered IO. We | |
1606 | * need to take the IOLOCK here to serialise the allocation and | |
1607 | * zeroing IO to prevent other IOLOCK holders (e.g. getbmap, | |
1608 | * truncate, direct IO) from racing against the transient | |
1609 | * allocated but not written state we can have here. | |
1610 | */ | |
1611 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
1612 | if (startoffset > fsize) { | |
1613 | error = xfs_alloc_file_space(ip, fsize, | |
1614 | startoffset - fsize, 0, | |
1615 | attr_flags | XFS_ATTR_NOLOCK); | |
1616 | if (error) { | |
1617 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
1618 | break; | |
1619 | } | |
1620 | } | |
1621 | ||
1622 | iattr.ia_valid = ATTR_SIZE; | |
1623 | iattr.ia_size = startoffset; | |
1624 | ||
1625 | error = xfs_setattr_size(ip, &iattr, | |
1626 | attr_flags | XFS_ATTR_NOLOCK); | |
1627 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
1628 | ||
1629 | if (error) | |
1630 | return error; | |
1631 | ||
1632 | clrprealloc = 1; | |
1633 | break; | |
1634 | ||
1635 | default: | |
1636 | ASSERT(0); | |
1637 | return XFS_ERROR(EINVAL); | |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * update the inode timestamp, mode, and prealloc flag bits | |
1642 | */ | |
1643 | tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID); | |
3d3c8b52 JL |
1644 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_writeid, 0, 0); |
1645 | if (error) { | |
c24b5dfa DC |
1646 | xfs_trans_cancel(tp, 0); |
1647 | return error; | |
1648 | } | |
1649 | ||
1650 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1651 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
1652 | ||
1653 | if ((attr_flags & XFS_ATTR_DMI) == 0) { | |
1654 | ip->i_d.di_mode &= ~S_ISUID; | |
1655 | ||
1656 | /* | |
1657 | * Note that we don't have to worry about mandatory | |
1658 | * file locking being disabled here because we only | |
1659 | * clear the S_ISGID bit if the Group execute bit is | |
1660 | * on, but if it was on then mandatory locking wouldn't | |
1661 | * have been enabled. | |
1662 | */ | |
1663 | if (ip->i_d.di_mode & S_IXGRP) | |
1664 | ip->i_d.di_mode &= ~S_ISGID; | |
1665 | ||
1666 | xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
1667 | } | |
1668 | if (setprealloc) | |
1669 | ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC; | |
1670 | else if (clrprealloc) | |
1671 | ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC; | |
1672 | ||
1673 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1674 | if (attr_flags & XFS_ATTR_SYNC) | |
1675 | xfs_trans_set_sync(tp); | |
1676 | return xfs_trans_commit(tp, 0); | |
1677 | } | |
a133d952 DC |
1678 | |
1679 | /* | |
1680 | * We need to check that the format of the data fork in the temporary inode is | |
1681 | * valid for the target inode before doing the swap. This is not a problem with | |
1682 | * attr1 because of the fixed fork offset, but attr2 has a dynamically sized | |
1683 | * data fork depending on the space the attribute fork is taking so we can get | |
1684 | * invalid formats on the target inode. | |
1685 | * | |
1686 | * E.g. target has space for 7 extents in extent format, temp inode only has | |
1687 | * space for 6. If we defragment down to 7 extents, then the tmp format is a | |
1688 | * btree, but when swapped it needs to be in extent format. Hence we can't just | |
1689 | * blindly swap data forks on attr2 filesystems. | |
1690 | * | |
1691 | * Note that we check the swap in both directions so that we don't end up with | |
1692 | * a corrupt temporary inode, either. | |
1693 | * | |
1694 | * Note that fixing the way xfs_fsr sets up the attribute fork in the source | |
1695 | * inode will prevent this situation from occurring, so all we do here is | |
1696 | * reject and log the attempt. basically we are putting the responsibility on | |
1697 | * userspace to get this right. | |
1698 | */ | |
1699 | static int | |
1700 | xfs_swap_extents_check_format( | |
1701 | xfs_inode_t *ip, /* target inode */ | |
1702 | xfs_inode_t *tip) /* tmp inode */ | |
1703 | { | |
1704 | ||
1705 | /* Should never get a local format */ | |
1706 | if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL || | |
1707 | tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) | |
1708 | return EINVAL; | |
1709 | ||
1710 | /* | |
1711 | * if the target inode has less extents that then temporary inode then | |
1712 | * why did userspace call us? | |
1713 | */ | |
1714 | if (ip->i_d.di_nextents < tip->i_d.di_nextents) | |
1715 | return EINVAL; | |
1716 | ||
1717 | /* | |
1718 | * if the target inode is in extent form and the temp inode is in btree | |
1719 | * form then we will end up with the target inode in the wrong format | |
1720 | * as we already know there are less extents in the temp inode. | |
1721 | */ | |
1722 | if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS && | |
1723 | tip->i_d.di_format == XFS_DINODE_FMT_BTREE) | |
1724 | return EINVAL; | |
1725 | ||
1726 | /* Check temp in extent form to max in target */ | |
1727 | if (tip->i_d.di_format == XFS_DINODE_FMT_EXTENTS && | |
1728 | XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) > | |
1729 | XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)) | |
1730 | return EINVAL; | |
1731 | ||
1732 | /* Check target in extent form to max in temp */ | |
1733 | if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS && | |
1734 | XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) > | |
1735 | XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK)) | |
1736 | return EINVAL; | |
1737 | ||
1738 | /* | |
1739 | * If we are in a btree format, check that the temp root block will fit | |
1740 | * in the target and that it has enough extents to be in btree format | |
1741 | * in the target. | |
1742 | * | |
1743 | * Note that we have to be careful to allow btree->extent conversions | |
1744 | * (a common defrag case) which will occur when the temp inode is in | |
1745 | * extent format... | |
1746 | */ | |
1747 | if (tip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
1748 | if (XFS_IFORK_BOFF(ip) && | |
1749 | XFS_BMAP_BMDR_SPACE(tip->i_df.if_broot) > XFS_IFORK_BOFF(ip)) | |
1750 | return EINVAL; | |
1751 | if (XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) <= | |
1752 | XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)) | |
1753 | return EINVAL; | |
1754 | } | |
1755 | ||
1756 | /* Reciprocal target->temp btree format checks */ | |
1757 | if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
1758 | if (XFS_IFORK_BOFF(tip) && | |
1759 | XFS_BMAP_BMDR_SPACE(ip->i_df.if_broot) > XFS_IFORK_BOFF(tip)) | |
1760 | return EINVAL; | |
1761 | if (XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) <= | |
1762 | XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK)) | |
1763 | return EINVAL; | |
1764 | } | |
1765 | ||
1766 | return 0; | |
1767 | } | |
1768 | ||
1769 | int | |
1770 | xfs_swap_extents( | |
1771 | xfs_inode_t *ip, /* target inode */ | |
1772 | xfs_inode_t *tip, /* tmp inode */ | |
1773 | xfs_swapext_t *sxp) | |
1774 | { | |
1775 | xfs_mount_t *mp = ip->i_mount; | |
1776 | xfs_trans_t *tp; | |
1777 | xfs_bstat_t *sbp = &sxp->sx_stat; | |
1778 | xfs_ifork_t *tempifp, *ifp, *tifp; | |
1779 | int src_log_flags, target_log_flags; | |
1780 | int error = 0; | |
1781 | int aforkblks = 0; | |
1782 | int taforkblks = 0; | |
1783 | __uint64_t tmp; | |
1784 | ||
a133d952 DC |
1785 | tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL); |
1786 | if (!tempifp) { | |
1787 | error = XFS_ERROR(ENOMEM); | |
1788 | goto out; | |
1789 | } | |
1790 | ||
1791 | /* | |
1792 | * we have to do two separate lock calls here to keep lockdep | |
1793 | * happy. If we try to get all the locks in one call, lock will | |
1794 | * report false positives when we drop the ILOCK and regain them | |
1795 | * below. | |
1796 | */ | |
1797 | xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL); | |
1798 | xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL); | |
1799 | ||
1800 | /* Verify that both files have the same format */ | |
1801 | if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) { | |
1802 | error = XFS_ERROR(EINVAL); | |
1803 | goto out_unlock; | |
1804 | } | |
1805 | ||
1806 | /* Verify both files are either real-time or non-realtime */ | |
1807 | if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) { | |
1808 | error = XFS_ERROR(EINVAL); | |
1809 | goto out_unlock; | |
1810 | } | |
1811 | ||
1812 | error = -filemap_write_and_wait(VFS_I(tip)->i_mapping); | |
1813 | if (error) | |
1814 | goto out_unlock; | |
1815 | truncate_pagecache_range(VFS_I(tip), 0, -1); | |
1816 | ||
1817 | /* Verify O_DIRECT for ftmp */ | |
1818 | if (VN_CACHED(VFS_I(tip)) != 0) { | |
1819 | error = XFS_ERROR(EINVAL); | |
1820 | goto out_unlock; | |
1821 | } | |
1822 | ||
1823 | /* Verify all data are being swapped */ | |
1824 | if (sxp->sx_offset != 0 || | |
1825 | sxp->sx_length != ip->i_d.di_size || | |
1826 | sxp->sx_length != tip->i_d.di_size) { | |
1827 | error = XFS_ERROR(EFAULT); | |
1828 | goto out_unlock; | |
1829 | } | |
1830 | ||
1831 | trace_xfs_swap_extent_before(ip, 0); | |
1832 | trace_xfs_swap_extent_before(tip, 1); | |
1833 | ||
1834 | /* check inode formats now that data is flushed */ | |
1835 | error = xfs_swap_extents_check_format(ip, tip); | |
1836 | if (error) { | |
1837 | xfs_notice(mp, | |
1838 | "%s: inode 0x%llx format is incompatible for exchanging.", | |
1839 | __func__, ip->i_ino); | |
1840 | goto out_unlock; | |
1841 | } | |
1842 | ||
1843 | /* | |
1844 | * Compare the current change & modify times with that | |
1845 | * passed in. If they differ, we abort this swap. | |
1846 | * This is the mechanism used to ensure the calling | |
1847 | * process that the file was not changed out from | |
1848 | * under it. | |
1849 | */ | |
1850 | if ((sbp->bs_ctime.tv_sec != VFS_I(ip)->i_ctime.tv_sec) || | |
1851 | (sbp->bs_ctime.tv_nsec != VFS_I(ip)->i_ctime.tv_nsec) || | |
1852 | (sbp->bs_mtime.tv_sec != VFS_I(ip)->i_mtime.tv_sec) || | |
1853 | (sbp->bs_mtime.tv_nsec != VFS_I(ip)->i_mtime.tv_nsec)) { | |
1854 | error = XFS_ERROR(EBUSY); | |
1855 | goto out_unlock; | |
1856 | } | |
1857 | ||
1858 | /* We need to fail if the file is memory mapped. Once we have tossed | |
1859 | * all existing pages, the page fault will have no option | |
1860 | * but to go to the filesystem for pages. By making the page fault call | |
1861 | * vop_read (or write in the case of autogrow) they block on the iolock | |
1862 | * until we have switched the extents. | |
1863 | */ | |
1864 | if (VN_MAPPED(VFS_I(ip))) { | |
1865 | error = XFS_ERROR(EBUSY); | |
1866 | goto out_unlock; | |
1867 | } | |
1868 | ||
1869 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1870 | xfs_iunlock(tip, XFS_ILOCK_EXCL); | |
1871 | ||
1872 | /* | |
1873 | * There is a race condition here since we gave up the | |
1874 | * ilock. However, the data fork will not change since | |
1875 | * we have the iolock (locked for truncation too) so we | |
1876 | * are safe. We don't really care if non-io related | |
1877 | * fields change. | |
1878 | */ | |
1879 | truncate_pagecache_range(VFS_I(ip), 0, -1); | |
1880 | ||
1881 | tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT); | |
3d3c8b52 JL |
1882 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0); |
1883 | if (error) { | |
a133d952 DC |
1884 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
1885 | xfs_iunlock(tip, XFS_IOLOCK_EXCL); | |
1886 | xfs_trans_cancel(tp, 0); | |
1887 | goto out; | |
1888 | } | |
1889 | xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL); | |
1890 | ||
1891 | /* | |
1892 | * Count the number of extended attribute blocks | |
1893 | */ | |
1894 | if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) && | |
1895 | (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
1896 | error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks); | |
1897 | if (error) | |
1898 | goto out_trans_cancel; | |
1899 | } | |
1900 | if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) && | |
1901 | (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
1902 | error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK, | |
1903 | &taforkblks); | |
1904 | if (error) | |
1905 | goto out_trans_cancel; | |
1906 | } | |
1907 | ||
21b5c978 DC |
1908 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); |
1909 | xfs_trans_ijoin(tp, tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
1910 | ||
1911 | /* | |
1912 | * Before we've swapped the forks, lets set the owners of the forks | |
1913 | * appropriately. We have to do this as we are demand paging the btree | |
1914 | * buffers, and so the validation done on read will expect the owner | |
1915 | * field to be correctly set. Once we change the owners, we can swap the | |
1916 | * inode forks. | |
1917 | * | |
1918 | * Note the trickiness in setting the log flags - we set the owner log | |
1919 | * flag on the opposite inode (i.e. the inode we are setting the new | |
1920 | * owner to be) because once we swap the forks and log that, log | |
1921 | * recovery is going to see the fork as owned by the swapped inode, | |
1922 | * not the pre-swapped inodes. | |
1923 | */ | |
1924 | src_log_flags = XFS_ILOG_CORE; | |
1925 | target_log_flags = XFS_ILOG_CORE; | |
1926 | if (ip->i_d.di_version == 3 && | |
1927 | ip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
638f4416 DC |
1928 | target_log_flags |= XFS_ILOG_DOWNER; |
1929 | error = xfs_bmbt_change_owner(tp, ip, XFS_DATA_FORK, | |
1930 | tip->i_ino, NULL); | |
21b5c978 DC |
1931 | if (error) |
1932 | goto out_trans_cancel; | |
1933 | } | |
1934 | ||
1935 | if (tip->i_d.di_version == 3 && | |
1936 | tip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
638f4416 DC |
1937 | src_log_flags |= XFS_ILOG_DOWNER; |
1938 | error = xfs_bmbt_change_owner(tp, tip, XFS_DATA_FORK, | |
1939 | ip->i_ino, NULL); | |
21b5c978 DC |
1940 | if (error) |
1941 | goto out_trans_cancel; | |
1942 | } | |
1943 | ||
a133d952 DC |
1944 | /* |
1945 | * Swap the data forks of the inodes | |
1946 | */ | |
1947 | ifp = &ip->i_df; | |
1948 | tifp = &tip->i_df; | |
1949 | *tempifp = *ifp; /* struct copy */ | |
1950 | *ifp = *tifp; /* struct copy */ | |
1951 | *tifp = *tempifp; /* struct copy */ | |
1952 | ||
1953 | /* | |
1954 | * Fix the on-disk inode values | |
1955 | */ | |
1956 | tmp = (__uint64_t)ip->i_d.di_nblocks; | |
1957 | ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks; | |
1958 | tip->i_d.di_nblocks = tmp + taforkblks - aforkblks; | |
1959 | ||
1960 | tmp = (__uint64_t) ip->i_d.di_nextents; | |
1961 | ip->i_d.di_nextents = tip->i_d.di_nextents; | |
1962 | tip->i_d.di_nextents = tmp; | |
1963 | ||
1964 | tmp = (__uint64_t) ip->i_d.di_format; | |
1965 | ip->i_d.di_format = tip->i_d.di_format; | |
1966 | tip->i_d.di_format = tmp; | |
1967 | ||
1968 | /* | |
1969 | * The extents in the source inode could still contain speculative | |
1970 | * preallocation beyond EOF (e.g. the file is open but not modified | |
1971 | * while defrag is in progress). In that case, we need to copy over the | |
1972 | * number of delalloc blocks the data fork in the source inode is | |
1973 | * tracking beyond EOF so that when the fork is truncated away when the | |
1974 | * temporary inode is unlinked we don't underrun the i_delayed_blks | |
1975 | * counter on that inode. | |
1976 | */ | |
1977 | ASSERT(tip->i_delayed_blks == 0); | |
1978 | tip->i_delayed_blks = ip->i_delayed_blks; | |
1979 | ip->i_delayed_blks = 0; | |
1980 | ||
a133d952 DC |
1981 | switch (ip->i_d.di_format) { |
1982 | case XFS_DINODE_FMT_EXTENTS: | |
1983 | /* If the extents fit in the inode, fix the | |
1984 | * pointer. Otherwise it's already NULL or | |
1985 | * pointing to the extent. | |
1986 | */ | |
1987 | if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) { | |
1988 | ifp->if_u1.if_extents = | |
1989 | ifp->if_u2.if_inline_ext; | |
1990 | } | |
1991 | src_log_flags |= XFS_ILOG_DEXT; | |
1992 | break; | |
1993 | case XFS_DINODE_FMT_BTREE: | |
21b5c978 | 1994 | ASSERT(ip->i_d.di_version < 3 || |
638f4416 | 1995 | (src_log_flags & XFS_ILOG_DOWNER)); |
a133d952 DC |
1996 | src_log_flags |= XFS_ILOG_DBROOT; |
1997 | break; | |
1998 | } | |
1999 | ||
a133d952 DC |
2000 | switch (tip->i_d.di_format) { |
2001 | case XFS_DINODE_FMT_EXTENTS: | |
2002 | /* If the extents fit in the inode, fix the | |
2003 | * pointer. Otherwise it's already NULL or | |
2004 | * pointing to the extent. | |
2005 | */ | |
2006 | if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) { | |
2007 | tifp->if_u1.if_extents = | |
2008 | tifp->if_u2.if_inline_ext; | |
2009 | } | |
2010 | target_log_flags |= XFS_ILOG_DEXT; | |
2011 | break; | |
2012 | case XFS_DINODE_FMT_BTREE: | |
2013 | target_log_flags |= XFS_ILOG_DBROOT; | |
21b5c978 | 2014 | ASSERT(tip->i_d.di_version < 3 || |
638f4416 | 2015 | (target_log_flags & XFS_ILOG_DOWNER)); |
a133d952 DC |
2016 | break; |
2017 | } | |
2018 | ||
a133d952 DC |
2019 | xfs_trans_log_inode(tp, ip, src_log_flags); |
2020 | xfs_trans_log_inode(tp, tip, target_log_flags); | |
2021 | ||
2022 | /* | |
2023 | * If this is a synchronous mount, make sure that the | |
2024 | * transaction goes to disk before returning to the user. | |
2025 | */ | |
2026 | if (mp->m_flags & XFS_MOUNT_WSYNC) | |
2027 | xfs_trans_set_sync(tp); | |
2028 | ||
2029 | error = xfs_trans_commit(tp, 0); | |
2030 | ||
2031 | trace_xfs_swap_extent_after(ip, 0); | |
2032 | trace_xfs_swap_extent_after(tip, 1); | |
2033 | out: | |
2034 | kmem_free(tempifp); | |
2035 | return error; | |
2036 | ||
2037 | out_unlock: | |
2038 | xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
2039 | xfs_iunlock(tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
2040 | goto out; | |
2041 | ||
2042 | out_trans_cancel: | |
2043 | xfs_trans_cancel(tp, 0); | |
2044 | goto out_unlock; | |
2045 | } |