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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" | |
70a9883c | 21 | #include "xfs_shared.h" |
239880ef DC |
22 | #include "xfs_format.h" |
23 | #include "xfs_log_format.h" | |
24 | #include "xfs_trans_resv.h" | |
68988114 | 25 | #include "xfs_bit.h" |
68988114 | 26 | #include "xfs_mount.h" |
57062787 | 27 | #include "xfs_da_format.h" |
68988114 DC |
28 | #include "xfs_inode.h" |
29 | #include "xfs_btree.h" | |
239880ef | 30 | #include "xfs_trans.h" |
68988114 DC |
31 | #include "xfs_extfree_item.h" |
32 | #include "xfs_alloc.h" | |
33 | #include "xfs_bmap.h" | |
34 | #include "xfs_bmap_util.h" | |
a4fbe6ab | 35 | #include "xfs_bmap_btree.h" |
68988114 DC |
36 | #include "xfs_rtalloc.h" |
37 | #include "xfs_error.h" | |
38 | #include "xfs_quota.h" | |
39 | #include "xfs_trans_space.h" | |
40 | #include "xfs_trace.h" | |
c24b5dfa | 41 | #include "xfs_icache.h" |
239880ef | 42 | #include "xfs_log.h" |
68988114 DC |
43 | |
44 | /* Kernel only BMAP related definitions and functions */ | |
45 | ||
46 | /* | |
47 | * Convert the given file system block to a disk block. We have to treat it | |
48 | * differently based on whether the file is a real time file or not, because the | |
49 | * bmap code does. | |
50 | */ | |
51 | xfs_daddr_t | |
52 | xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb) | |
53 | { | |
54 | return (XFS_IS_REALTIME_INODE(ip) ? \ | |
55 | (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \ | |
56 | XFS_FSB_TO_DADDR((ip)->i_mount, (fsb))); | |
57 | } | |
58 | ||
3fbbbea3 DC |
59 | /* |
60 | * Routine to zero an extent on disk allocated to the specific inode. | |
61 | * | |
62 | * The VFS functions take a linearised filesystem block offset, so we have to | |
63 | * convert the sparse xfs fsb to the right format first. | |
64 | * VFS types are real funky, too. | |
65 | */ | |
66 | int | |
67 | xfs_zero_extent( | |
68 | struct xfs_inode *ip, | |
69 | xfs_fsblock_t start_fsb, | |
70 | xfs_off_t count_fsb) | |
71 | { | |
72 | struct xfs_mount *mp = ip->i_mount; | |
73 | xfs_daddr_t sector = xfs_fsb_to_db(ip, start_fsb); | |
74 | sector_t block = XFS_BB_TO_FSBT(mp, sector); | |
3fbbbea3 | 75 | |
3dc29161 MW |
76 | return blkdev_issue_zeroout(xfs_find_bdev_for_inode(VFS_I(ip)), |
77 | block << (mp->m_super->s_blocksize_bits - 9), | |
78 | count_fsb << (mp->m_super->s_blocksize_bits - 9), | |
79 | GFP_NOFS, true); | |
3fbbbea3 DC |
80 | } |
81 | ||
68988114 DC |
82 | /* |
83 | * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi | |
84 | * caller. Frees all the extents that need freeing, which must be done | |
85 | * last due to locking considerations. We never free any extents in | |
86 | * the first transaction. | |
87 | * | |
f6106efa ES |
88 | * If an inode *ip is provided, rejoin it to the transaction if |
89 | * the transaction was committed. | |
68988114 DC |
90 | */ |
91 | int /* error */ | |
92 | xfs_bmap_finish( | |
8d99fe92 BF |
93 | struct xfs_trans **tp, /* transaction pointer addr */ |
94 | struct xfs_bmap_free *flist, /* i/o: list extents to free */ | |
f6106efa | 95 | struct xfs_inode *ip) |
68988114 | 96 | { |
8d99fe92 BF |
97 | struct xfs_efd_log_item *efd; /* extent free data */ |
98 | struct xfs_efi_log_item *efi; /* extent free intention */ | |
99 | int error; /* error return value */ | |
f6106efa | 100 | int committed;/* xact committed or not */ |
8d99fe92 BF |
101 | struct xfs_bmap_free_item *free; /* free extent item */ |
102 | struct xfs_bmap_free_item *next; /* next item on free list */ | |
68988114 DC |
103 | |
104 | ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES); | |
f6106efa | 105 | if (flist->xbf_count == 0) |
68988114 | 106 | return 0; |
f6106efa | 107 | |
2e6db6c4 | 108 | efi = xfs_trans_get_efi(*tp, flist->xbf_count); |
68988114 | 109 | for (free = flist->xbf_first; free; free = free->xbfi_next) |
2e6db6c4 | 110 | xfs_trans_log_efi_extent(*tp, efi, free->xbfi_startblock, |
68988114 | 111 | free->xbfi_blockcount); |
3d3c8b52 | 112 | |
f6106efa | 113 | error = __xfs_trans_roll(tp, ip, &committed); |
8d99fe92 BF |
114 | if (error) { |
115 | /* | |
116 | * If the transaction was committed, drop the EFD reference | |
117 | * since we're bailing out of here. The other reference is | |
118 | * dropped when the EFI hits the AIL. | |
119 | * | |
120 | * If the transaction was not committed, the EFI is freed by the | |
121 | * EFI item unlock handler on abort. Also, we have a new | |
122 | * transaction so we should return committed=1 even though we're | |
123 | * returning an error. | |
124 | */ | |
f6106efa | 125 | if (committed) { |
8d99fe92 BF |
126 | xfs_efi_release(efi); |
127 | xfs_force_shutdown((*tp)->t_mountp, | |
0c871f9a | 128 | SHUTDOWN_META_IO_ERROR); |
8d99fe92 | 129 | } |
68988114 | 130 | return error; |
8d99fe92 | 131 | } |
68988114 | 132 | |
6bc43af3 BF |
133 | /* |
134 | * Get an EFD and free each extent in the list, logging to the EFD in | |
135 | * the process. The remaining bmap free list is cleaned up by the caller | |
136 | * on error. | |
137 | */ | |
2e6db6c4 | 138 | efd = xfs_trans_get_efd(*tp, efi, flist->xbf_count); |
68988114 DC |
139 | for (free = flist->xbf_first; free != NULL; free = next) { |
140 | next = free->xbfi_next; | |
8d99fe92 | 141 | |
6bc43af3 BF |
142 | error = xfs_trans_free_extent(*tp, efd, free->xbfi_startblock, |
143 | free->xbfi_blockcount); | |
8d99fe92 BF |
144 | if (error) |
145 | return error; | |
146 | ||
68988114 DC |
147 | xfs_bmap_del_free(flist, NULL, free); |
148 | } | |
8d99fe92 | 149 | |
68988114 DC |
150 | return 0; |
151 | } | |
152 | ||
153 | int | |
154 | xfs_bmap_rtalloc( | |
155 | struct xfs_bmalloca *ap) /* bmap alloc argument struct */ | |
156 | { | |
157 | xfs_alloctype_t atype = 0; /* type for allocation routines */ | |
158 | int error; /* error return value */ | |
159 | xfs_mount_t *mp; /* mount point structure */ | |
160 | xfs_extlen_t prod = 0; /* product factor for allocators */ | |
161 | xfs_extlen_t ralen = 0; /* realtime allocation length */ | |
162 | xfs_extlen_t align; /* minimum allocation alignment */ | |
163 | xfs_rtblock_t rtb; | |
164 | ||
165 | mp = ap->ip->i_mount; | |
166 | align = xfs_get_extsz_hint(ap->ip); | |
167 | prod = align / mp->m_sb.sb_rextsize; | |
168 | error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, | |
169 | align, 1, ap->eof, 0, | |
170 | ap->conv, &ap->offset, &ap->length); | |
171 | if (error) | |
172 | return error; | |
173 | ASSERT(ap->length); | |
174 | ASSERT(ap->length % mp->m_sb.sb_rextsize == 0); | |
175 | ||
176 | /* | |
177 | * If the offset & length are not perfectly aligned | |
178 | * then kill prod, it will just get us in trouble. | |
179 | */ | |
180 | if (do_mod(ap->offset, align) || ap->length % align) | |
181 | prod = 1; | |
182 | /* | |
183 | * Set ralen to be the actual requested length in rtextents. | |
184 | */ | |
185 | ralen = ap->length / mp->m_sb.sb_rextsize; | |
186 | /* | |
187 | * If the old value was close enough to MAXEXTLEN that | |
188 | * we rounded up to it, cut it back so it's valid again. | |
189 | * Note that if it's a really large request (bigger than | |
190 | * MAXEXTLEN), we don't hear about that number, and can't | |
191 | * adjust the starting point to match it. | |
192 | */ | |
193 | if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN) | |
194 | ralen = MAXEXTLEN / mp->m_sb.sb_rextsize; | |
195 | ||
196 | /* | |
4b680afb | 197 | * Lock out modifications to both the RT bitmap and summary inodes |
68988114 DC |
198 | */ |
199 | xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL); | |
200 | xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL); | |
4b680afb DC |
201 | xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL); |
202 | xfs_trans_ijoin(ap->tp, mp->m_rsumip, XFS_ILOCK_EXCL); | |
68988114 DC |
203 | |
204 | /* | |
205 | * If it's an allocation to an empty file at offset 0, | |
206 | * pick an extent that will space things out in the rt area. | |
207 | */ | |
208 | if (ap->eof && ap->offset == 0) { | |
209 | xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */ | |
210 | ||
211 | error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx); | |
212 | if (error) | |
213 | return error; | |
214 | ap->blkno = rtx * mp->m_sb.sb_rextsize; | |
215 | } else { | |
216 | ap->blkno = 0; | |
217 | } | |
218 | ||
219 | xfs_bmap_adjacent(ap); | |
220 | ||
221 | /* | |
222 | * Realtime allocation, done through xfs_rtallocate_extent. | |
223 | */ | |
224 | atype = ap->blkno == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO; | |
225 | do_div(ap->blkno, mp->m_sb.sb_rextsize); | |
226 | rtb = ap->blkno; | |
227 | ap->length = ralen; | |
228 | if ((error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, ap->length, | |
229 | &ralen, atype, ap->wasdel, prod, &rtb))) | |
230 | return error; | |
231 | if (rtb == NULLFSBLOCK && prod > 1 && | |
232 | (error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, | |
233 | ap->length, &ralen, atype, | |
234 | ap->wasdel, 1, &rtb))) | |
235 | return error; | |
236 | ap->blkno = rtb; | |
237 | if (ap->blkno != NULLFSBLOCK) { | |
238 | ap->blkno *= mp->m_sb.sb_rextsize; | |
239 | ralen *= mp->m_sb.sb_rextsize; | |
240 | ap->length = ralen; | |
241 | ap->ip->i_d.di_nblocks += ralen; | |
242 | xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE); | |
243 | if (ap->wasdel) | |
244 | ap->ip->i_delayed_blks -= ralen; | |
245 | /* | |
246 | * Adjust the disk quota also. This was reserved | |
247 | * earlier. | |
248 | */ | |
249 | xfs_trans_mod_dquot_byino(ap->tp, ap->ip, | |
250 | ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT : | |
251 | XFS_TRANS_DQ_RTBCOUNT, (long) ralen); | |
3fbbbea3 DC |
252 | |
253 | /* Zero the extent if we were asked to do so */ | |
254 | if (ap->userdata & XFS_ALLOC_USERDATA_ZERO) { | |
255 | error = xfs_zero_extent(ap->ip, ap->blkno, ap->length); | |
256 | if (error) | |
257 | return error; | |
258 | } | |
68988114 DC |
259 | } else { |
260 | ap->length = 0; | |
261 | } | |
262 | return 0; | |
263 | } | |
264 | ||
68988114 DC |
265 | /* |
266 | * Check if the endoff is outside the last extent. If so the caller will grow | |
267 | * the allocation to a stripe unit boundary. All offsets are considered outside | |
268 | * the end of file for an empty fork, so 1 is returned in *eof in that case. | |
269 | */ | |
270 | int | |
271 | xfs_bmap_eof( | |
272 | struct xfs_inode *ip, | |
273 | xfs_fileoff_t endoff, | |
274 | int whichfork, | |
275 | int *eof) | |
276 | { | |
277 | struct xfs_bmbt_irec rec; | |
278 | int error; | |
279 | ||
280 | error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, eof); | |
281 | if (error || *eof) | |
282 | return error; | |
283 | ||
284 | *eof = endoff >= rec.br_startoff + rec.br_blockcount; | |
285 | return 0; | |
286 | } | |
287 | ||
288 | /* | |
289 | * Extent tree block counting routines. | |
290 | */ | |
291 | ||
292 | /* | |
293 | * Count leaf blocks given a range of extent records. | |
294 | */ | |
295 | STATIC void | |
296 | xfs_bmap_count_leaves( | |
297 | xfs_ifork_t *ifp, | |
298 | xfs_extnum_t idx, | |
299 | int numrecs, | |
300 | int *count) | |
301 | { | |
302 | int b; | |
303 | ||
304 | for (b = 0; b < numrecs; b++) { | |
305 | xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b); | |
306 | *count += xfs_bmbt_get_blockcount(frp); | |
307 | } | |
308 | } | |
309 | ||
310 | /* | |
311 | * Count leaf blocks given a range of extent records originally | |
312 | * in btree format. | |
313 | */ | |
314 | STATIC void | |
315 | xfs_bmap_disk_count_leaves( | |
316 | struct xfs_mount *mp, | |
317 | struct xfs_btree_block *block, | |
318 | int numrecs, | |
319 | int *count) | |
320 | { | |
321 | int b; | |
322 | xfs_bmbt_rec_t *frp; | |
323 | ||
324 | for (b = 1; b <= numrecs; b++) { | |
325 | frp = XFS_BMBT_REC_ADDR(mp, block, b); | |
326 | *count += xfs_bmbt_disk_get_blockcount(frp); | |
327 | } | |
328 | } | |
329 | ||
330 | /* | |
331 | * Recursively walks each level of a btree | |
8be11e92 | 332 | * to count total fsblocks in use. |
68988114 DC |
333 | */ |
334 | STATIC int /* error */ | |
335 | xfs_bmap_count_tree( | |
336 | xfs_mount_t *mp, /* file system mount point */ | |
337 | xfs_trans_t *tp, /* transaction pointer */ | |
338 | xfs_ifork_t *ifp, /* inode fork pointer */ | |
339 | xfs_fsblock_t blockno, /* file system block number */ | |
340 | int levelin, /* level in btree */ | |
341 | int *count) /* Count of blocks */ | |
342 | { | |
343 | int error; | |
344 | xfs_buf_t *bp, *nbp; | |
345 | int level = levelin; | |
346 | __be64 *pp; | |
347 | xfs_fsblock_t bno = blockno; | |
348 | xfs_fsblock_t nextbno; | |
349 | struct xfs_btree_block *block, *nextblock; | |
350 | int numrecs; | |
351 | ||
352 | error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF, | |
353 | &xfs_bmbt_buf_ops); | |
354 | if (error) | |
355 | return error; | |
356 | *count += 1; | |
357 | block = XFS_BUF_TO_BLOCK(bp); | |
358 | ||
359 | if (--level) { | |
360 | /* Not at node above leaves, count this level of nodes */ | |
361 | nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib); | |
362 | while (nextbno != NULLFSBLOCK) { | |
363 | error = xfs_btree_read_bufl(mp, tp, nextbno, 0, &nbp, | |
364 | XFS_BMAP_BTREE_REF, | |
365 | &xfs_bmbt_buf_ops); | |
366 | if (error) | |
367 | return error; | |
368 | *count += 1; | |
369 | nextblock = XFS_BUF_TO_BLOCK(nbp); | |
370 | nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib); | |
371 | xfs_trans_brelse(tp, nbp); | |
372 | } | |
373 | ||
374 | /* Dive to the next level */ | |
375 | pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]); | |
376 | bno = be64_to_cpu(*pp); | |
377 | if (unlikely((error = | |
378 | xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) { | |
379 | xfs_trans_brelse(tp, bp); | |
380 | XFS_ERROR_REPORT("xfs_bmap_count_tree(1)", | |
381 | XFS_ERRLEVEL_LOW, mp); | |
2451337d | 382 | return -EFSCORRUPTED; |
68988114 DC |
383 | } |
384 | xfs_trans_brelse(tp, bp); | |
385 | } else { | |
386 | /* count all level 1 nodes and their leaves */ | |
387 | for (;;) { | |
388 | nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib); | |
389 | numrecs = be16_to_cpu(block->bb_numrecs); | |
390 | xfs_bmap_disk_count_leaves(mp, block, numrecs, count); | |
391 | xfs_trans_brelse(tp, bp); | |
392 | if (nextbno == NULLFSBLOCK) | |
393 | break; | |
394 | bno = nextbno; | |
395 | error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, | |
396 | XFS_BMAP_BTREE_REF, | |
397 | &xfs_bmbt_buf_ops); | |
398 | if (error) | |
399 | return error; | |
400 | *count += 1; | |
401 | block = XFS_BUF_TO_BLOCK(bp); | |
402 | } | |
403 | } | |
404 | return 0; | |
405 | } | |
406 | ||
407 | /* | |
408 | * Count fsblocks of the given fork. | |
409 | */ | |
0d5a75e9 | 410 | static int /* error */ |
68988114 DC |
411 | xfs_bmap_count_blocks( |
412 | xfs_trans_t *tp, /* transaction pointer */ | |
413 | xfs_inode_t *ip, /* incore inode */ | |
414 | int whichfork, /* data or attr fork */ | |
415 | int *count) /* out: count of blocks */ | |
416 | { | |
417 | struct xfs_btree_block *block; /* current btree block */ | |
418 | xfs_fsblock_t bno; /* block # of "block" */ | |
419 | xfs_ifork_t *ifp; /* fork structure */ | |
420 | int level; /* btree level, for checking */ | |
421 | xfs_mount_t *mp; /* file system mount structure */ | |
422 | __be64 *pp; /* pointer to block address */ | |
423 | ||
424 | bno = NULLFSBLOCK; | |
425 | mp = ip->i_mount; | |
426 | ifp = XFS_IFORK_PTR(ip, whichfork); | |
427 | if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) { | |
428 | xfs_bmap_count_leaves(ifp, 0, | |
429 | ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t), | |
430 | count); | |
431 | return 0; | |
432 | } | |
433 | ||
434 | /* | |
435 | * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out. | |
436 | */ | |
437 | block = ifp->if_broot; | |
438 | level = be16_to_cpu(block->bb_level); | |
439 | ASSERT(level > 0); | |
440 | pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes); | |
441 | bno = be64_to_cpu(*pp); | |
d5cf09ba | 442 | ASSERT(bno != NULLFSBLOCK); |
68988114 DC |
443 | ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount); |
444 | ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks); | |
445 | ||
446 | if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) { | |
447 | XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW, | |
448 | mp); | |
2451337d | 449 | return -EFSCORRUPTED; |
68988114 DC |
450 | } |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | /* | |
456 | * returns 1 for success, 0 if we failed to map the extent. | |
457 | */ | |
458 | STATIC int | |
459 | xfs_getbmapx_fix_eof_hole( | |
460 | xfs_inode_t *ip, /* xfs incore inode pointer */ | |
461 | struct getbmapx *out, /* output structure */ | |
462 | int prealloced, /* this is a file with | |
463 | * preallocated data space */ | |
464 | __int64_t end, /* last block requested */ | |
465 | xfs_fsblock_t startblock) | |
466 | { | |
467 | __int64_t fixlen; | |
468 | xfs_mount_t *mp; /* file system mount point */ | |
469 | xfs_ifork_t *ifp; /* inode fork pointer */ | |
470 | xfs_extnum_t lastx; /* last extent pointer */ | |
471 | xfs_fileoff_t fileblock; | |
472 | ||
473 | if (startblock == HOLESTARTBLOCK) { | |
474 | mp = ip->i_mount; | |
475 | out->bmv_block = -1; | |
476 | fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, XFS_ISIZE(ip))); | |
477 | fixlen -= out->bmv_offset; | |
478 | if (prealloced && out->bmv_offset + out->bmv_length == end) { | |
479 | /* Came to hole at EOF. Trim it. */ | |
480 | if (fixlen <= 0) | |
481 | return 0; | |
482 | out->bmv_length = fixlen; | |
483 | } | |
484 | } else { | |
485 | if (startblock == DELAYSTARTBLOCK) | |
486 | out->bmv_block = -2; | |
487 | else | |
488 | out->bmv_block = xfs_fsb_to_db(ip, startblock); | |
489 | fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset); | |
490 | ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); | |
491 | if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) && | |
492 | (lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1)) | |
493 | out->bmv_oflags |= BMV_OF_LAST; | |
494 | } | |
495 | ||
496 | return 1; | |
497 | } | |
498 | ||
499 | /* | |
500 | * Get inode's extents as described in bmv, and format for output. | |
501 | * Calls formatter to fill the user's buffer until all extents | |
502 | * are mapped, until the passed-in bmv->bmv_count slots have | |
503 | * been filled, or until the formatter short-circuits the loop, | |
504 | * if it is tracking filled-in extents on its own. | |
505 | */ | |
506 | int /* error code */ | |
507 | xfs_getbmap( | |
508 | xfs_inode_t *ip, | |
509 | struct getbmapx *bmv, /* user bmap structure */ | |
510 | xfs_bmap_format_t formatter, /* format to user */ | |
511 | void *arg) /* formatter arg */ | |
512 | { | |
513 | __int64_t bmvend; /* last block requested */ | |
514 | int error = 0; /* return value */ | |
515 | __int64_t fixlen; /* length for -1 case */ | |
516 | int i; /* extent number */ | |
517 | int lock; /* lock state */ | |
518 | xfs_bmbt_irec_t *map; /* buffer for user's data */ | |
519 | xfs_mount_t *mp; /* file system mount point */ | |
520 | int nex; /* # of user extents can do */ | |
521 | int nexleft; /* # of user extents left */ | |
522 | int subnex; /* # of bmapi's can do */ | |
523 | int nmap; /* number of map entries */ | |
524 | struct getbmapx *out; /* output structure */ | |
525 | int whichfork; /* data or attr fork */ | |
526 | int prealloced; /* this is a file with | |
527 | * preallocated data space */ | |
528 | int iflags; /* interface flags */ | |
529 | int bmapi_flags; /* flags for xfs_bmapi */ | |
530 | int cur_ext = 0; | |
531 | ||
532 | mp = ip->i_mount; | |
533 | iflags = bmv->bmv_iflags; | |
534 | whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK; | |
535 | ||
536 | if (whichfork == XFS_ATTR_FORK) { | |
537 | if (XFS_IFORK_Q(ip)) { | |
538 | if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS && | |
539 | ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE && | |
540 | ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL) | |
2451337d | 541 | return -EINVAL; |
68988114 DC |
542 | } else if (unlikely( |
543 | ip->i_d.di_aformat != 0 && | |
544 | ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) { | |
545 | XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW, | |
546 | ip->i_mount); | |
2451337d | 547 | return -EFSCORRUPTED; |
68988114 DC |
548 | } |
549 | ||
550 | prealloced = 0; | |
551 | fixlen = 1LL << 32; | |
552 | } else { | |
553 | if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS && | |
554 | ip->i_d.di_format != XFS_DINODE_FMT_BTREE && | |
555 | ip->i_d.di_format != XFS_DINODE_FMT_LOCAL) | |
2451337d | 556 | return -EINVAL; |
68988114 DC |
557 | |
558 | if (xfs_get_extsz_hint(ip) || | |
559 | ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){ | |
560 | prealloced = 1; | |
561 | fixlen = mp->m_super->s_maxbytes; | |
562 | } else { | |
563 | prealloced = 0; | |
564 | fixlen = XFS_ISIZE(ip); | |
565 | } | |
566 | } | |
567 | ||
568 | if (bmv->bmv_length == -1) { | |
569 | fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen)); | |
570 | bmv->bmv_length = | |
571 | max_t(__int64_t, fixlen - bmv->bmv_offset, 0); | |
572 | } else if (bmv->bmv_length == 0) { | |
573 | bmv->bmv_entries = 0; | |
574 | return 0; | |
575 | } else if (bmv->bmv_length < 0) { | |
2451337d | 576 | return -EINVAL; |
68988114 DC |
577 | } |
578 | ||
579 | nex = bmv->bmv_count - 1; | |
580 | if (nex <= 0) | |
2451337d | 581 | return -EINVAL; |
68988114 DC |
582 | bmvend = bmv->bmv_offset + bmv->bmv_length; |
583 | ||
584 | ||
585 | if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx)) | |
2451337d | 586 | return -ENOMEM; |
fdd3ccee DC |
587 | out = kmem_zalloc_large(bmv->bmv_count * sizeof(struct getbmapx), 0); |
588 | if (!out) | |
2451337d | 589 | return -ENOMEM; |
68988114 DC |
590 | |
591 | xfs_ilock(ip, XFS_IOLOCK_SHARED); | |
efa70be1 CH |
592 | if (whichfork == XFS_DATA_FORK) { |
593 | if (!(iflags & BMV_IF_DELALLOC) && | |
594 | (ip->i_delayed_blks || XFS_ISIZE(ip) > ip->i_d.di_size)) { | |
2451337d | 595 | error = filemap_write_and_wait(VFS_I(ip)->i_mapping); |
68988114 DC |
596 | if (error) |
597 | goto out_unlock_iolock; | |
efa70be1 CH |
598 | |
599 | /* | |
600 | * Even after flushing the inode, there can still be | |
601 | * delalloc blocks on the inode beyond EOF due to | |
602 | * speculative preallocation. These are not removed | |
603 | * until the release function is called or the inode | |
604 | * is inactivated. Hence we cannot assert here that | |
605 | * ip->i_delayed_blks == 0. | |
606 | */ | |
68988114 | 607 | } |
68988114 | 608 | |
efa70be1 CH |
609 | lock = xfs_ilock_data_map_shared(ip); |
610 | } else { | |
611 | lock = xfs_ilock_attr_map_shared(ip); | |
612 | } | |
68988114 DC |
613 | |
614 | /* | |
615 | * Don't let nex be bigger than the number of extents | |
616 | * we can have assuming alternating holes and real extents. | |
617 | */ | |
618 | if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1) | |
619 | nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1; | |
620 | ||
621 | bmapi_flags = xfs_bmapi_aflag(whichfork); | |
622 | if (!(iflags & BMV_IF_PREALLOC)) | |
623 | bmapi_flags |= XFS_BMAPI_IGSTATE; | |
624 | ||
625 | /* | |
626 | * Allocate enough space to handle "subnex" maps at a time. | |
627 | */ | |
2451337d | 628 | error = -ENOMEM; |
68988114 DC |
629 | subnex = 16; |
630 | map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS); | |
631 | if (!map) | |
632 | goto out_unlock_ilock; | |
633 | ||
634 | bmv->bmv_entries = 0; | |
635 | ||
636 | if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 && | |
637 | (whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) { | |
638 | error = 0; | |
639 | goto out_free_map; | |
640 | } | |
641 | ||
642 | nexleft = nex; | |
643 | ||
644 | do { | |
645 | nmap = (nexleft > subnex) ? subnex : nexleft; | |
646 | error = xfs_bmapi_read(ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset), | |
647 | XFS_BB_TO_FSB(mp, bmv->bmv_length), | |
648 | map, &nmap, bmapi_flags); | |
649 | if (error) | |
650 | goto out_free_map; | |
651 | ASSERT(nmap <= subnex); | |
652 | ||
653 | for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) { | |
654 | out[cur_ext].bmv_oflags = 0; | |
655 | if (map[i].br_state == XFS_EXT_UNWRITTEN) | |
656 | out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC; | |
657 | else if (map[i].br_startblock == DELAYSTARTBLOCK) | |
658 | out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC; | |
659 | out[cur_ext].bmv_offset = | |
660 | XFS_FSB_TO_BB(mp, map[i].br_startoff); | |
661 | out[cur_ext].bmv_length = | |
662 | XFS_FSB_TO_BB(mp, map[i].br_blockcount); | |
663 | out[cur_ext].bmv_unused1 = 0; | |
664 | out[cur_ext].bmv_unused2 = 0; | |
665 | ||
666 | /* | |
667 | * delayed allocation extents that start beyond EOF can | |
668 | * occur due to speculative EOF allocation when the | |
669 | * delalloc extent is larger than the largest freespace | |
670 | * extent at conversion time. These extents cannot be | |
671 | * converted by data writeback, so can exist here even | |
672 | * if we are not supposed to be finding delalloc | |
673 | * extents. | |
674 | */ | |
675 | if (map[i].br_startblock == DELAYSTARTBLOCK && | |
676 | map[i].br_startoff <= XFS_B_TO_FSB(mp, XFS_ISIZE(ip))) | |
677 | ASSERT((iflags & BMV_IF_DELALLOC) != 0); | |
678 | ||
679 | if (map[i].br_startblock == HOLESTARTBLOCK && | |
680 | whichfork == XFS_ATTR_FORK) { | |
681 | /* came to the end of attribute fork */ | |
682 | out[cur_ext].bmv_oflags |= BMV_OF_LAST; | |
683 | goto out_free_map; | |
684 | } | |
685 | ||
686 | if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext], | |
687 | prealloced, bmvend, | |
688 | map[i].br_startblock)) | |
689 | goto out_free_map; | |
690 | ||
691 | bmv->bmv_offset = | |
692 | out[cur_ext].bmv_offset + | |
693 | out[cur_ext].bmv_length; | |
694 | bmv->bmv_length = | |
695 | max_t(__int64_t, 0, bmvend - bmv->bmv_offset); | |
696 | ||
697 | /* | |
698 | * In case we don't want to return the hole, | |
699 | * don't increase cur_ext so that we can reuse | |
700 | * it in the next loop. | |
701 | */ | |
702 | if ((iflags & BMV_IF_NO_HOLES) && | |
703 | map[i].br_startblock == HOLESTARTBLOCK) { | |
704 | memset(&out[cur_ext], 0, sizeof(out[cur_ext])); | |
705 | continue; | |
706 | } | |
707 | ||
708 | nexleft--; | |
709 | bmv->bmv_entries++; | |
710 | cur_ext++; | |
711 | } | |
712 | } while (nmap && nexleft && bmv->bmv_length); | |
713 | ||
714 | out_free_map: | |
715 | kmem_free(map); | |
716 | out_unlock_ilock: | |
01f4f327 | 717 | xfs_iunlock(ip, lock); |
68988114 DC |
718 | out_unlock_iolock: |
719 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
720 | ||
721 | for (i = 0; i < cur_ext; i++) { | |
722 | int full = 0; /* user array is full */ | |
723 | ||
724 | /* format results & advance arg */ | |
725 | error = formatter(&arg, &out[i], &full); | |
726 | if (error || full) | |
727 | break; | |
728 | } | |
729 | ||
fdd3ccee | 730 | kmem_free(out); |
68988114 DC |
731 | return error; |
732 | } | |
733 | ||
734 | /* | |
735 | * dead simple method of punching delalyed allocation blocks from a range in | |
736 | * the inode. Walks a block at a time so will be slow, but is only executed in | |
ad4809bf | 737 | * rare error cases so the overhead is not critical. This will always punch out |
68988114 DC |
738 | * both the start and end blocks, even if the ranges only partially overlap |
739 | * them, so it is up to the caller to ensure that partial blocks are not | |
740 | * passed in. | |
741 | */ | |
742 | int | |
743 | xfs_bmap_punch_delalloc_range( | |
744 | struct xfs_inode *ip, | |
745 | xfs_fileoff_t start_fsb, | |
746 | xfs_fileoff_t length) | |
747 | { | |
748 | xfs_fileoff_t remaining = length; | |
749 | int error = 0; | |
750 | ||
751 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); | |
752 | ||
753 | do { | |
754 | int done; | |
755 | xfs_bmbt_irec_t imap; | |
756 | int nimaps = 1; | |
757 | xfs_fsblock_t firstblock; | |
758 | xfs_bmap_free_t flist; | |
759 | ||
760 | /* | |
761 | * Map the range first and check that it is a delalloc extent | |
762 | * before trying to unmap the range. Otherwise we will be | |
763 | * trying to remove a real extent (which requires a | |
764 | * transaction) or a hole, which is probably a bad idea... | |
765 | */ | |
766 | error = xfs_bmapi_read(ip, start_fsb, 1, &imap, &nimaps, | |
767 | XFS_BMAPI_ENTIRE); | |
768 | ||
769 | if (error) { | |
770 | /* something screwed, just bail */ | |
771 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { | |
772 | xfs_alert(ip->i_mount, | |
773 | "Failed delalloc mapping lookup ino %lld fsb %lld.", | |
774 | ip->i_ino, start_fsb); | |
775 | } | |
776 | break; | |
777 | } | |
778 | if (!nimaps) { | |
779 | /* nothing there */ | |
780 | goto next_block; | |
781 | } | |
782 | if (imap.br_startblock != DELAYSTARTBLOCK) { | |
783 | /* been converted, ignore */ | |
784 | goto next_block; | |
785 | } | |
786 | WARN_ON(imap.br_blockcount == 0); | |
787 | ||
788 | /* | |
789 | * Note: while we initialise the firstblock/flist pair, they | |
790 | * should never be used because blocks should never be | |
791 | * allocated or freed for a delalloc extent and hence we need | |
792 | * don't cancel or finish them after the xfs_bunmapi() call. | |
793 | */ | |
794 | xfs_bmap_init(&flist, &firstblock); | |
795 | error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock, | |
796 | &flist, &done); | |
797 | if (error) | |
798 | break; | |
799 | ||
800 | ASSERT(!flist.xbf_count && !flist.xbf_first); | |
801 | next_block: | |
802 | start_fsb++; | |
803 | remaining--; | |
804 | } while(remaining > 0); | |
805 | ||
806 | return error; | |
807 | } | |
c24b5dfa DC |
808 | |
809 | /* | |
810 | * Test whether it is appropriate to check an inode for and free post EOF | |
811 | * blocks. The 'force' parameter determines whether we should also consider | |
812 | * regular files that are marked preallocated or append-only. | |
813 | */ | |
814 | bool | |
815 | xfs_can_free_eofblocks(struct xfs_inode *ip, bool force) | |
816 | { | |
817 | /* prealloc/delalloc exists only on regular files */ | |
c19b3b05 | 818 | if (!S_ISREG(VFS_I(ip)->i_mode)) |
c24b5dfa DC |
819 | return false; |
820 | ||
821 | /* | |
822 | * Zero sized files with no cached pages and delalloc blocks will not | |
823 | * have speculative prealloc/delalloc blocks to remove. | |
824 | */ | |
825 | if (VFS_I(ip)->i_size == 0 && | |
2667c6f9 | 826 | VFS_I(ip)->i_mapping->nrpages == 0 && |
c24b5dfa DC |
827 | ip->i_delayed_blks == 0) |
828 | return false; | |
829 | ||
830 | /* If we haven't read in the extent list, then don't do it now. */ | |
831 | if (!(ip->i_df.if_flags & XFS_IFEXTENTS)) | |
832 | return false; | |
833 | ||
834 | /* | |
835 | * Do not free real preallocated or append-only files unless the file | |
836 | * has delalloc blocks and we are forced to remove them. | |
837 | */ | |
838 | if (ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) | |
839 | if (!force || ip->i_delayed_blks == 0) | |
840 | return false; | |
841 | ||
842 | return true; | |
843 | } | |
844 | ||
845 | /* | |
846 | * This is called by xfs_inactive to free any blocks beyond eof | |
847 | * when the link count isn't zero and by xfs_dm_punch_hole() when | |
848 | * punching a hole to EOF. | |
849 | */ | |
850 | int | |
851 | xfs_free_eofblocks( | |
852 | xfs_mount_t *mp, | |
853 | xfs_inode_t *ip, | |
854 | bool need_iolock) | |
855 | { | |
856 | xfs_trans_t *tp; | |
857 | int error; | |
858 | xfs_fileoff_t end_fsb; | |
859 | xfs_fileoff_t last_fsb; | |
860 | xfs_filblks_t map_len; | |
861 | int nimaps; | |
862 | xfs_bmbt_irec_t imap; | |
863 | ||
864 | /* | |
865 | * Figure out if there are any blocks beyond the end | |
866 | * of the file. If not, then there is nothing to do. | |
867 | */ | |
868 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip)); | |
869 | last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); | |
870 | if (last_fsb <= end_fsb) | |
871 | return 0; | |
872 | map_len = last_fsb - end_fsb; | |
873 | ||
874 | nimaps = 1; | |
875 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
876 | error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0); | |
877 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
878 | ||
879 | if (!error && (nimaps != 0) && | |
880 | (imap.br_startblock != HOLESTARTBLOCK || | |
881 | ip->i_delayed_blks)) { | |
882 | /* | |
883 | * Attach the dquots to the inode up front. | |
884 | */ | |
885 | error = xfs_qm_dqattach(ip, 0); | |
886 | if (error) | |
887 | return error; | |
888 | ||
889 | /* | |
890 | * There are blocks after the end of file. | |
891 | * Free them up now by truncating the file to | |
892 | * its current size. | |
893 | */ | |
c24b5dfa | 894 | if (need_iolock) { |
253f4911 | 895 | if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) |
2451337d | 896 | return -EAGAIN; |
c24b5dfa DC |
897 | } |
898 | ||
253f4911 CH |
899 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, |
900 | &tp); | |
c24b5dfa DC |
901 | if (error) { |
902 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
c24b5dfa DC |
903 | if (need_iolock) |
904 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
905 | return error; | |
906 | } | |
907 | ||
908 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
909 | xfs_trans_ijoin(tp, ip, 0); | |
910 | ||
911 | /* | |
912 | * Do not update the on-disk file size. If we update the | |
913 | * on-disk file size and then the system crashes before the | |
914 | * contents of the file are flushed to disk then the files | |
915 | * may be full of holes (ie NULL files bug). | |
916 | */ | |
917 | error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, | |
918 | XFS_ISIZE(ip)); | |
919 | if (error) { | |
920 | /* | |
921 | * If we get an error at this point we simply don't | |
922 | * bother truncating the file. | |
923 | */ | |
4906e215 | 924 | xfs_trans_cancel(tp); |
c24b5dfa | 925 | } else { |
70393313 | 926 | error = xfs_trans_commit(tp); |
c24b5dfa DC |
927 | if (!error) |
928 | xfs_inode_clear_eofblocks_tag(ip); | |
929 | } | |
930 | ||
931 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
932 | if (need_iolock) | |
933 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
934 | } | |
935 | return error; | |
936 | } | |
937 | ||
83aee9e4 | 938 | int |
c24b5dfa | 939 | xfs_alloc_file_space( |
83aee9e4 | 940 | struct xfs_inode *ip, |
c24b5dfa DC |
941 | xfs_off_t offset, |
942 | xfs_off_t len, | |
5f8aca8b | 943 | int alloc_type) |
c24b5dfa DC |
944 | { |
945 | xfs_mount_t *mp = ip->i_mount; | |
946 | xfs_off_t count; | |
947 | xfs_filblks_t allocated_fsb; | |
948 | xfs_filblks_t allocatesize_fsb; | |
949 | xfs_extlen_t extsz, temp; | |
950 | xfs_fileoff_t startoffset_fsb; | |
951 | xfs_fsblock_t firstfsb; | |
952 | int nimaps; | |
953 | int quota_flag; | |
954 | int rt; | |
955 | xfs_trans_t *tp; | |
956 | xfs_bmbt_irec_t imaps[1], *imapp; | |
957 | xfs_bmap_free_t free_list; | |
958 | uint qblocks, resblks, resrtextents; | |
c24b5dfa DC |
959 | int error; |
960 | ||
961 | trace_xfs_alloc_file_space(ip); | |
962 | ||
963 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2451337d | 964 | return -EIO; |
c24b5dfa DC |
965 | |
966 | error = xfs_qm_dqattach(ip, 0); | |
967 | if (error) | |
968 | return error; | |
969 | ||
970 | if (len <= 0) | |
2451337d | 971 | return -EINVAL; |
c24b5dfa DC |
972 | |
973 | rt = XFS_IS_REALTIME_INODE(ip); | |
974 | extsz = xfs_get_extsz_hint(ip); | |
975 | ||
976 | count = len; | |
977 | imapp = &imaps[0]; | |
978 | nimaps = 1; | |
979 | startoffset_fsb = XFS_B_TO_FSBT(mp, offset); | |
980 | allocatesize_fsb = XFS_B_TO_FSB(mp, count); | |
981 | ||
982 | /* | |
983 | * Allocate file space until done or until there is an error | |
984 | */ | |
985 | while (allocatesize_fsb && !error) { | |
986 | xfs_fileoff_t s, e; | |
987 | ||
988 | /* | |
989 | * Determine space reservations for data/realtime. | |
990 | */ | |
991 | if (unlikely(extsz)) { | |
992 | s = startoffset_fsb; | |
993 | do_div(s, extsz); | |
994 | s *= extsz; | |
995 | e = startoffset_fsb + allocatesize_fsb; | |
996 | if ((temp = do_mod(startoffset_fsb, extsz))) | |
997 | e += temp; | |
998 | if ((temp = do_mod(e, extsz))) | |
999 | e += extsz - temp; | |
1000 | } else { | |
1001 | s = 0; | |
1002 | e = allocatesize_fsb; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * The transaction reservation is limited to a 32-bit block | |
1007 | * count, hence we need to limit the number of blocks we are | |
1008 | * trying to reserve to avoid an overflow. We can't allocate | |
1009 | * more than @nimaps extents, and an extent is limited on disk | |
1010 | * to MAXEXTLEN (21 bits), so use that to enforce the limit. | |
1011 | */ | |
1012 | resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps)); | |
1013 | if (unlikely(rt)) { | |
1014 | resrtextents = qblocks = resblks; | |
1015 | resrtextents /= mp->m_sb.sb_rextsize; | |
1016 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); | |
1017 | quota_flag = XFS_QMOPT_RES_RTBLKS; | |
1018 | } else { | |
1019 | resrtextents = 0; | |
1020 | resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks); | |
1021 | quota_flag = XFS_QMOPT_RES_REGBLKS; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Allocate and setup the transaction. | |
1026 | */ | |
253f4911 CH |
1027 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, |
1028 | resrtextents, 0, &tp); | |
1029 | ||
c24b5dfa DC |
1030 | /* |
1031 | * Check for running out of space | |
1032 | */ | |
1033 | if (error) { | |
1034 | /* | |
1035 | * Free the transaction structure. | |
1036 | */ | |
2451337d | 1037 | ASSERT(error == -ENOSPC || XFS_FORCED_SHUTDOWN(mp)); |
c24b5dfa DC |
1038 | break; |
1039 | } | |
1040 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1041 | error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, | |
1042 | 0, quota_flag); | |
1043 | if (error) | |
1044 | goto error1; | |
1045 | ||
1046 | xfs_trans_ijoin(tp, ip, 0); | |
1047 | ||
1048 | xfs_bmap_init(&free_list, &firstfsb); | |
1049 | error = xfs_bmapi_write(tp, ip, startoffset_fsb, | |
1050 | allocatesize_fsb, alloc_type, &firstfsb, | |
dbd5c8c9 | 1051 | resblks, imapp, &nimaps, &free_list); |
f6106efa | 1052 | if (error) |
c24b5dfa | 1053 | goto error0; |
c24b5dfa DC |
1054 | |
1055 | /* | |
1056 | * Complete the transaction | |
1057 | */ | |
f6106efa ES |
1058 | error = xfs_bmap_finish(&tp, &free_list, NULL); |
1059 | if (error) | |
c24b5dfa | 1060 | goto error0; |
c24b5dfa | 1061 | |
70393313 | 1062 | error = xfs_trans_commit(tp); |
c24b5dfa | 1063 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
f6106efa | 1064 | if (error) |
c24b5dfa | 1065 | break; |
c24b5dfa DC |
1066 | |
1067 | allocated_fsb = imapp->br_blockcount; | |
1068 | ||
1069 | if (nimaps == 0) { | |
2451337d | 1070 | error = -ENOSPC; |
c24b5dfa DC |
1071 | break; |
1072 | } | |
1073 | ||
1074 | startoffset_fsb += allocated_fsb; | |
1075 | allocatesize_fsb -= allocated_fsb; | |
1076 | } | |
1077 | ||
1078 | return error; | |
1079 | ||
1080 | error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ | |
1081 | xfs_bmap_cancel(&free_list); | |
1082 | xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag); | |
1083 | ||
1084 | error1: /* Just cancel transaction */ | |
4906e215 | 1085 | xfs_trans_cancel(tp); |
c24b5dfa DC |
1086 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1087 | return error; | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * Zero file bytes between startoff and endoff inclusive. | |
1092 | * The iolock is held exclusive and no blocks are buffered. | |
1093 | * | |
1094 | * This function is used by xfs_free_file_space() to zero | |
1095 | * partial blocks when the range to free is not block aligned. | |
1096 | * When unreserving space with boundaries that are not block | |
1097 | * aligned we round up the start and round down the end | |
1098 | * boundaries and then use this function to zero the parts of | |
1099 | * the blocks that got dropped during the rounding. | |
1100 | */ | |
1101 | STATIC int | |
1102 | xfs_zero_remaining_bytes( | |
1103 | xfs_inode_t *ip, | |
1104 | xfs_off_t startoff, | |
1105 | xfs_off_t endoff) | |
1106 | { | |
1107 | xfs_bmbt_irec_t imap; | |
1108 | xfs_fileoff_t offset_fsb; | |
1109 | xfs_off_t lastoffset; | |
1110 | xfs_off_t offset; | |
1111 | xfs_buf_t *bp; | |
1112 | xfs_mount_t *mp = ip->i_mount; | |
1113 | int nimap; | |
1114 | int error = 0; | |
1115 | ||
1116 | /* | |
1117 | * Avoid doing I/O beyond eof - it's not necessary | |
1118 | * since nothing can read beyond eof. The space will | |
1119 | * be zeroed when the file is extended anyway. | |
1120 | */ | |
1121 | if (startoff >= XFS_ISIZE(ip)) | |
1122 | return 0; | |
1123 | ||
1124 | if (endoff > XFS_ISIZE(ip)) | |
1125 | endoff = XFS_ISIZE(ip); | |
1126 | ||
c24b5dfa | 1127 | for (offset = startoff; offset <= endoff; offset = lastoffset + 1) { |
4f317369 CH |
1128 | uint lock_mode; |
1129 | ||
c24b5dfa DC |
1130 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
1131 | nimap = 1; | |
4f317369 CH |
1132 | |
1133 | lock_mode = xfs_ilock_data_map_shared(ip); | |
c24b5dfa | 1134 | error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0); |
4f317369 CH |
1135 | xfs_iunlock(ip, lock_mode); |
1136 | ||
c24b5dfa DC |
1137 | if (error || nimap < 1) |
1138 | break; | |
1139 | ASSERT(imap.br_blockcount >= 1); | |
1140 | ASSERT(imap.br_startoff == offset_fsb); | |
4f69f578 DC |
1141 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); |
1142 | ||
1143 | if (imap.br_startblock == HOLESTARTBLOCK || | |
1144 | imap.br_state == XFS_EXT_UNWRITTEN) { | |
1145 | /* skip the entire extent */ | |
1146 | lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + | |
1147 | imap.br_blockcount) - 1; | |
1148 | continue; | |
1149 | } | |
1150 | ||
c24b5dfa DC |
1151 | lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1; |
1152 | if (lastoffset > endoff) | |
1153 | lastoffset = endoff; | |
4f69f578 DC |
1154 | |
1155 | /* DAX can just zero the backing device directly */ | |
1156 | if (IS_DAX(VFS_I(ip))) { | |
1157 | error = dax_zero_page_range(VFS_I(ip), offset, | |
1158 | lastoffset - offset + 1, | |
1159 | xfs_get_blocks_direct); | |
1160 | if (error) | |
1161 | return error; | |
c24b5dfa | 1162 | continue; |
4f69f578 | 1163 | } |
83a0adc3 | 1164 | |
8c156125 CH |
1165 | error = xfs_buf_read_uncached(XFS_IS_REALTIME_INODE(ip) ? |
1166 | mp->m_rtdev_targp : mp->m_ddev_targp, | |
1167 | xfs_fsb_to_db(ip, imap.br_startblock), | |
1168 | BTOBB(mp->m_sb.sb_blocksize), | |
1169 | 0, &bp, NULL); | |
1170 | if (error) | |
1171 | return error; | |
1172 | ||
c24b5dfa | 1173 | memset(bp->b_addr + |
8c156125 CH |
1174 | (offset - XFS_FSB_TO_B(mp, imap.br_startoff)), |
1175 | 0, lastoffset - offset + 1); | |
83a0adc3 | 1176 | |
8c156125 CH |
1177 | error = xfs_bwrite(bp); |
1178 | xfs_buf_relse(bp); | |
1179 | if (error) | |
1180 | return error; | |
c24b5dfa | 1181 | } |
c24b5dfa DC |
1182 | return error; |
1183 | } | |
1184 | ||
83aee9e4 | 1185 | int |
c24b5dfa | 1186 | xfs_free_file_space( |
83aee9e4 | 1187 | struct xfs_inode *ip, |
c24b5dfa | 1188 | xfs_off_t offset, |
5f8aca8b | 1189 | xfs_off_t len) |
c24b5dfa | 1190 | { |
c24b5dfa DC |
1191 | int done; |
1192 | xfs_fileoff_t endoffset_fsb; | |
1193 | int error; | |
1194 | xfs_fsblock_t firstfsb; | |
1195 | xfs_bmap_free_t free_list; | |
1196 | xfs_bmbt_irec_t imap; | |
1197 | xfs_off_t ioffset; | |
8b5279e3 | 1198 | xfs_off_t iendoffset; |
c24b5dfa DC |
1199 | xfs_extlen_t mod=0; |
1200 | xfs_mount_t *mp; | |
1201 | int nimap; | |
1202 | uint resblks; | |
1203 | xfs_off_t rounding; | |
1204 | int rt; | |
1205 | xfs_fileoff_t startoffset_fsb; | |
1206 | xfs_trans_t *tp; | |
c24b5dfa DC |
1207 | |
1208 | mp = ip->i_mount; | |
1209 | ||
1210 | trace_xfs_free_file_space(ip); | |
1211 | ||
1212 | error = xfs_qm_dqattach(ip, 0); | |
1213 | if (error) | |
1214 | return error; | |
1215 | ||
1216 | error = 0; | |
1217 | if (len <= 0) /* if nothing being freed */ | |
1218 | return error; | |
1219 | rt = XFS_IS_REALTIME_INODE(ip); | |
1220 | startoffset_fsb = XFS_B_TO_FSB(mp, offset); | |
1221 | endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len); | |
1222 | ||
5f8aca8b CH |
1223 | /* wait for the completion of any pending DIOs */ |
1224 | inode_dio_wait(VFS_I(ip)); | |
c24b5dfa | 1225 | |
09cbfeaf | 1226 | rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_SIZE); |
8b5279e3 BF |
1227 | ioffset = round_down(offset, rounding); |
1228 | iendoffset = round_up(offset + len, rounding) - 1; | |
1229 | error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping, ioffset, | |
1230 | iendoffset); | |
c24b5dfa | 1231 | if (error) |
5f8aca8b | 1232 | goto out; |
8b5279e3 | 1233 | truncate_pagecache_range(VFS_I(ip), ioffset, iendoffset); |
c24b5dfa DC |
1234 | |
1235 | /* | |
1236 | * Need to zero the stuff we're not freeing, on disk. | |
1237 | * If it's a realtime file & can't use unwritten extents then we | |
1238 | * actually need to zero the extent edges. Otherwise xfs_bunmapi | |
1239 | * will take care of it for us. | |
1240 | */ | |
1241 | if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) { | |
1242 | nimap = 1; | |
1243 | error = xfs_bmapi_read(ip, startoffset_fsb, 1, | |
1244 | &imap, &nimap, 0); | |
1245 | if (error) | |
5f8aca8b | 1246 | goto out; |
c24b5dfa DC |
1247 | ASSERT(nimap == 0 || nimap == 1); |
1248 | if (nimap && imap.br_startblock != HOLESTARTBLOCK) { | |
1249 | xfs_daddr_t block; | |
1250 | ||
1251 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); | |
1252 | block = imap.br_startblock; | |
1253 | mod = do_div(block, mp->m_sb.sb_rextsize); | |
1254 | if (mod) | |
1255 | startoffset_fsb += mp->m_sb.sb_rextsize - mod; | |
1256 | } | |
1257 | nimap = 1; | |
1258 | error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1, | |
1259 | &imap, &nimap, 0); | |
1260 | if (error) | |
5f8aca8b | 1261 | goto out; |
c24b5dfa DC |
1262 | ASSERT(nimap == 0 || nimap == 1); |
1263 | if (nimap && imap.br_startblock != HOLESTARTBLOCK) { | |
1264 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); | |
1265 | mod++; | |
1266 | if (mod && (mod != mp->m_sb.sb_rextsize)) | |
1267 | endoffset_fsb -= mod; | |
1268 | } | |
1269 | } | |
1270 | if ((done = (endoffset_fsb <= startoffset_fsb))) | |
1271 | /* | |
1272 | * One contiguous piece to clear | |
1273 | */ | |
1274 | error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1); | |
1275 | else { | |
1276 | /* | |
1277 | * Some full blocks, possibly two pieces to clear | |
1278 | */ | |
1279 | if (offset < XFS_FSB_TO_B(mp, startoffset_fsb)) | |
1280 | error = xfs_zero_remaining_bytes(ip, offset, | |
1281 | XFS_FSB_TO_B(mp, startoffset_fsb) - 1); | |
1282 | if (!error && | |
1283 | XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len) | |
1284 | error = xfs_zero_remaining_bytes(ip, | |
1285 | XFS_FSB_TO_B(mp, endoffset_fsb), | |
1286 | offset + len - 1); | |
1287 | } | |
1288 | ||
1289 | /* | |
1290 | * free file space until done or until there is an error | |
1291 | */ | |
1292 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); | |
1293 | while (!error && !done) { | |
1294 | ||
1295 | /* | |
1296 | * allocate and setup the transaction. Allow this | |
1297 | * transaction to dip into the reserve blocks to ensure | |
1298 | * the freeing of the space succeeds at ENOSPC. | |
1299 | */ | |
253f4911 CH |
1300 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, |
1301 | &tp); | |
c24b5dfa | 1302 | if (error) { |
2451337d | 1303 | ASSERT(error == -ENOSPC || XFS_FORCED_SHUTDOWN(mp)); |
c24b5dfa DC |
1304 | break; |
1305 | } | |
1306 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1307 | error = xfs_trans_reserve_quota(tp, mp, | |
1308 | ip->i_udquot, ip->i_gdquot, ip->i_pdquot, | |
1309 | resblks, 0, XFS_QMOPT_RES_REGBLKS); | |
1310 | if (error) | |
1311 | goto error1; | |
1312 | ||
1313 | xfs_trans_ijoin(tp, ip, 0); | |
1314 | ||
1315 | /* | |
1316 | * issue the bunmapi() call to free the blocks | |
1317 | */ | |
1318 | xfs_bmap_init(&free_list, &firstfsb); | |
1319 | error = xfs_bunmapi(tp, ip, startoffset_fsb, | |
1320 | endoffset_fsb - startoffset_fsb, | |
1321 | 0, 2, &firstfsb, &free_list, &done); | |
f6106efa | 1322 | if (error) |
c24b5dfa | 1323 | goto error0; |
c24b5dfa DC |
1324 | |
1325 | /* | |
1326 | * complete the transaction | |
1327 | */ | |
f6106efa ES |
1328 | error = xfs_bmap_finish(&tp, &free_list, NULL); |
1329 | if (error) | |
c24b5dfa | 1330 | goto error0; |
c24b5dfa | 1331 | |
70393313 | 1332 | error = xfs_trans_commit(tp); |
c24b5dfa DC |
1333 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1334 | } | |
1335 | ||
5f8aca8b | 1336 | out: |
c24b5dfa DC |
1337 | return error; |
1338 | ||
1339 | error0: | |
1340 | xfs_bmap_cancel(&free_list); | |
1341 | error1: | |
4906e215 | 1342 | xfs_trans_cancel(tp); |
5f8aca8b CH |
1343 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1344 | goto out; | |
c24b5dfa DC |
1345 | } |
1346 | ||
5d11fb4b BF |
1347 | /* |
1348 | * Preallocate and zero a range of a file. This mechanism has the allocation | |
1349 | * semantics of fallocate and in addition converts data in the range to zeroes. | |
1350 | */ | |
865e9446 | 1351 | int |
c24b5dfa DC |
1352 | xfs_zero_file_space( |
1353 | struct xfs_inode *ip, | |
1354 | xfs_off_t offset, | |
5f8aca8b | 1355 | xfs_off_t len) |
c24b5dfa DC |
1356 | { |
1357 | struct xfs_mount *mp = ip->i_mount; | |
5d11fb4b | 1358 | uint blksize; |
c24b5dfa DC |
1359 | int error; |
1360 | ||
897b73b6 DC |
1361 | trace_xfs_zero_file_space(ip); |
1362 | ||
5d11fb4b | 1363 | blksize = 1 << mp->m_sb.sb_blocklog; |
c24b5dfa DC |
1364 | |
1365 | /* | |
5d11fb4b BF |
1366 | * Punch a hole and prealloc the range. We use hole punch rather than |
1367 | * unwritten extent conversion for two reasons: | |
1368 | * | |
1369 | * 1.) Hole punch handles partial block zeroing for us. | |
1370 | * | |
1371 | * 2.) If prealloc returns ENOSPC, the file range is still zero-valued | |
1372 | * by virtue of the hole punch. | |
c24b5dfa | 1373 | */ |
5d11fb4b BF |
1374 | error = xfs_free_file_space(ip, offset, len); |
1375 | if (error) | |
1376 | goto out; | |
c24b5dfa | 1377 | |
5d11fb4b BF |
1378 | error = xfs_alloc_file_space(ip, round_down(offset, blksize), |
1379 | round_up(offset + len, blksize) - | |
1380 | round_down(offset, blksize), | |
1381 | XFS_BMAPI_PREALLOC); | |
5f8aca8b | 1382 | out: |
c24b5dfa DC |
1383 | return error; |
1384 | ||
1385 | } | |
1386 | ||
e1d8fb88 | 1387 | /* |
a904b1ca NJ |
1388 | * @next_fsb will keep track of the extent currently undergoing shift. |
1389 | * @stop_fsb will keep track of the extent at which we have to stop. | |
1390 | * If we are shifting left, we will start with block (offset + len) and | |
1391 | * shift each extent till last extent. | |
1392 | * If we are shifting right, we will start with last extent inside file space | |
1393 | * and continue until we reach the block corresponding to offset. | |
e1d8fb88 | 1394 | */ |
72c1a739 | 1395 | static int |
a904b1ca NJ |
1396 | xfs_shift_file_space( |
1397 | struct xfs_inode *ip, | |
1398 | xfs_off_t offset, | |
1399 | xfs_off_t len, | |
1400 | enum shift_direction direction) | |
e1d8fb88 NJ |
1401 | { |
1402 | int done = 0; | |
1403 | struct xfs_mount *mp = ip->i_mount; | |
1404 | struct xfs_trans *tp; | |
1405 | int error; | |
e1d8fb88 NJ |
1406 | struct xfs_bmap_free free_list; |
1407 | xfs_fsblock_t first_block; | |
a904b1ca | 1408 | xfs_fileoff_t stop_fsb; |
2c845f5a | 1409 | xfs_fileoff_t next_fsb; |
e1d8fb88 NJ |
1410 | xfs_fileoff_t shift_fsb; |
1411 | ||
a904b1ca | 1412 | ASSERT(direction == SHIFT_LEFT || direction == SHIFT_RIGHT); |
e1d8fb88 | 1413 | |
a904b1ca NJ |
1414 | if (direction == SHIFT_LEFT) { |
1415 | next_fsb = XFS_B_TO_FSB(mp, offset + len); | |
1416 | stop_fsb = XFS_B_TO_FSB(mp, VFS_I(ip)->i_size); | |
1417 | } else { | |
1418 | /* | |
1419 | * If right shift, delegate the work of initialization of | |
1420 | * next_fsb to xfs_bmap_shift_extent as it has ilock held. | |
1421 | */ | |
1422 | next_fsb = NULLFSBLOCK; | |
1423 | stop_fsb = XFS_B_TO_FSB(mp, offset); | |
1424 | } | |
e1d8fb88 | 1425 | |
e1d8fb88 NJ |
1426 | shift_fsb = XFS_B_TO_FSB(mp, len); |
1427 | ||
f71721d0 BF |
1428 | /* |
1429 | * Trim eofblocks to avoid shifting uninitialized post-eof preallocation | |
1430 | * into the accessible region of the file. | |
1431 | */ | |
41b9d726 BF |
1432 | if (xfs_can_free_eofblocks(ip, true)) { |
1433 | error = xfs_free_eofblocks(mp, ip, false); | |
1434 | if (error) | |
1435 | return error; | |
1436 | } | |
1669a8ca | 1437 | |
f71721d0 BF |
1438 | /* |
1439 | * Writeback and invalidate cache for the remainder of the file as we're | |
a904b1ca | 1440 | * about to shift down every extent from offset to EOF. |
f71721d0 BF |
1441 | */ |
1442 | error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping, | |
a904b1ca | 1443 | offset, -1); |
f71721d0 BF |
1444 | if (error) |
1445 | return error; | |
1446 | error = invalidate_inode_pages2_range(VFS_I(ip)->i_mapping, | |
09cbfeaf | 1447 | offset >> PAGE_SHIFT, -1); |
e1d8fb88 NJ |
1448 | if (error) |
1449 | return error; | |
1450 | ||
a904b1ca NJ |
1451 | /* |
1452 | * The extent shiting code works on extent granularity. So, if | |
1453 | * stop_fsb is not the starting block of extent, we need to split | |
1454 | * the extent at stop_fsb. | |
1455 | */ | |
1456 | if (direction == SHIFT_RIGHT) { | |
1457 | error = xfs_bmap_split_extent(ip, stop_fsb); | |
1458 | if (error) | |
1459 | return error; | |
1460 | } | |
1461 | ||
e1d8fb88 | 1462 | while (!error && !done) { |
e1d8fb88 NJ |
1463 | /* |
1464 | * We would need to reserve permanent block for transaction. | |
1465 | * This will come into picture when after shifting extent into | |
1466 | * hole we found that adjacent extents can be merged which | |
1467 | * may lead to freeing of a block during record update. | |
1468 | */ | |
253f4911 CH |
1469 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, |
1470 | XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, 0, &tp); | |
1471 | if (error) | |
e1d8fb88 | 1472 | break; |
e1d8fb88 NJ |
1473 | |
1474 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1475 | error = xfs_trans_reserve_quota(tp, mp, ip->i_udquot, | |
1476 | ip->i_gdquot, ip->i_pdquot, | |
1477 | XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, | |
1478 | XFS_QMOPT_RES_REGBLKS); | |
1479 | if (error) | |
d4a97a04 | 1480 | goto out_trans_cancel; |
e1d8fb88 | 1481 | |
a904b1ca | 1482 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); |
e1d8fb88 NJ |
1483 | |
1484 | xfs_bmap_init(&free_list, &first_block); | |
1485 | ||
1486 | /* | |
1487 | * We are using the write transaction in which max 2 bmbt | |
1488 | * updates are allowed | |
1489 | */ | |
a904b1ca NJ |
1490 | error = xfs_bmap_shift_extents(tp, ip, &next_fsb, shift_fsb, |
1491 | &done, stop_fsb, &first_block, &free_list, | |
1492 | direction, XFS_BMAP_MAX_SHIFT_EXTENTS); | |
e1d8fb88 | 1493 | if (error) |
d4a97a04 | 1494 | goto out_bmap_cancel; |
e1d8fb88 | 1495 | |
f6106efa | 1496 | error = xfs_bmap_finish(&tp, &free_list, NULL); |
e1d8fb88 | 1497 | if (error) |
d4a97a04 | 1498 | goto out_bmap_cancel; |
e1d8fb88 | 1499 | |
70393313 | 1500 | error = xfs_trans_commit(tp); |
e1d8fb88 NJ |
1501 | } |
1502 | ||
1503 | return error; | |
1504 | ||
d4a97a04 BF |
1505 | out_bmap_cancel: |
1506 | xfs_bmap_cancel(&free_list); | |
1507 | out_trans_cancel: | |
4906e215 | 1508 | xfs_trans_cancel(tp); |
e1d8fb88 NJ |
1509 | return error; |
1510 | } | |
1511 | ||
a904b1ca NJ |
1512 | /* |
1513 | * xfs_collapse_file_space() | |
1514 | * This routine frees disk space and shift extent for the given file. | |
1515 | * The first thing we do is to free data blocks in the specified range | |
1516 | * by calling xfs_free_file_space(). It would also sync dirty data | |
1517 | * and invalidate page cache over the region on which collapse range | |
1518 | * is working. And Shift extent records to the left to cover a hole. | |
1519 | * RETURNS: | |
1520 | * 0 on success | |
1521 | * errno on error | |
1522 | * | |
1523 | */ | |
1524 | int | |
1525 | xfs_collapse_file_space( | |
1526 | struct xfs_inode *ip, | |
1527 | xfs_off_t offset, | |
1528 | xfs_off_t len) | |
1529 | { | |
1530 | int error; | |
1531 | ||
1532 | ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); | |
1533 | trace_xfs_collapse_file_space(ip); | |
1534 | ||
1535 | error = xfs_free_file_space(ip, offset, len); | |
1536 | if (error) | |
1537 | return error; | |
1538 | ||
1539 | return xfs_shift_file_space(ip, offset, len, SHIFT_LEFT); | |
1540 | } | |
1541 | ||
1542 | /* | |
1543 | * xfs_insert_file_space() | |
1544 | * This routine create hole space by shifting extents for the given file. | |
1545 | * The first thing we do is to sync dirty data and invalidate page cache | |
1546 | * over the region on which insert range is working. And split an extent | |
1547 | * to two extents at given offset by calling xfs_bmap_split_extent. | |
1548 | * And shift all extent records which are laying between [offset, | |
1549 | * last allocated extent] to the right to reserve hole range. | |
1550 | * RETURNS: | |
1551 | * 0 on success | |
1552 | * errno on error | |
1553 | */ | |
1554 | int | |
1555 | xfs_insert_file_space( | |
1556 | struct xfs_inode *ip, | |
1557 | loff_t offset, | |
1558 | loff_t len) | |
1559 | { | |
1560 | ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); | |
1561 | trace_xfs_insert_file_space(ip); | |
1562 | ||
1563 | return xfs_shift_file_space(ip, offset, len, SHIFT_RIGHT); | |
1564 | } | |
1565 | ||
a133d952 DC |
1566 | /* |
1567 | * We need to check that the format of the data fork in the temporary inode is | |
1568 | * valid for the target inode before doing the swap. This is not a problem with | |
1569 | * attr1 because of the fixed fork offset, but attr2 has a dynamically sized | |
1570 | * data fork depending on the space the attribute fork is taking so we can get | |
1571 | * invalid formats on the target inode. | |
1572 | * | |
1573 | * E.g. target has space for 7 extents in extent format, temp inode only has | |
1574 | * space for 6. If we defragment down to 7 extents, then the tmp format is a | |
1575 | * btree, but when swapped it needs to be in extent format. Hence we can't just | |
1576 | * blindly swap data forks on attr2 filesystems. | |
1577 | * | |
1578 | * Note that we check the swap in both directions so that we don't end up with | |
1579 | * a corrupt temporary inode, either. | |
1580 | * | |
1581 | * Note that fixing the way xfs_fsr sets up the attribute fork in the source | |
1582 | * inode will prevent this situation from occurring, so all we do here is | |
1583 | * reject and log the attempt. basically we are putting the responsibility on | |
1584 | * userspace to get this right. | |
1585 | */ | |
1586 | static int | |
1587 | xfs_swap_extents_check_format( | |
1588 | xfs_inode_t *ip, /* target inode */ | |
1589 | xfs_inode_t *tip) /* tmp inode */ | |
1590 | { | |
1591 | ||
1592 | /* Should never get a local format */ | |
1593 | if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL || | |
1594 | tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) | |
2451337d | 1595 | return -EINVAL; |
a133d952 DC |
1596 | |
1597 | /* | |
1598 | * if the target inode has less extents that then temporary inode then | |
1599 | * why did userspace call us? | |
1600 | */ | |
1601 | if (ip->i_d.di_nextents < tip->i_d.di_nextents) | |
2451337d | 1602 | return -EINVAL; |
a133d952 DC |
1603 | |
1604 | /* | |
1605 | * if the target inode is in extent form and the temp inode is in btree | |
1606 | * form then we will end up with the target inode in the wrong format | |
1607 | * as we already know there are less extents in the temp inode. | |
1608 | */ | |
1609 | if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS && | |
1610 | tip->i_d.di_format == XFS_DINODE_FMT_BTREE) | |
2451337d | 1611 | return -EINVAL; |
a133d952 DC |
1612 | |
1613 | /* Check temp in extent form to max in target */ | |
1614 | if (tip->i_d.di_format == XFS_DINODE_FMT_EXTENTS && | |
1615 | XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) > | |
1616 | XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)) | |
2451337d | 1617 | return -EINVAL; |
a133d952 DC |
1618 | |
1619 | /* Check target in extent form to max in temp */ | |
1620 | if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS && | |
1621 | XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) > | |
1622 | XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK)) | |
2451337d | 1623 | return -EINVAL; |
a133d952 DC |
1624 | |
1625 | /* | |
1626 | * If we are in a btree format, check that the temp root block will fit | |
1627 | * in the target and that it has enough extents to be in btree format | |
1628 | * in the target. | |
1629 | * | |
1630 | * Note that we have to be careful to allow btree->extent conversions | |
1631 | * (a common defrag case) which will occur when the temp inode is in | |
1632 | * extent format... | |
1633 | */ | |
1634 | if (tip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
1635 | if (XFS_IFORK_BOFF(ip) && | |
1636 | XFS_BMAP_BMDR_SPACE(tip->i_df.if_broot) > XFS_IFORK_BOFF(ip)) | |
2451337d | 1637 | return -EINVAL; |
a133d952 DC |
1638 | if (XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) <= |
1639 | XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)) | |
2451337d | 1640 | return -EINVAL; |
a133d952 DC |
1641 | } |
1642 | ||
1643 | /* Reciprocal target->temp btree format checks */ | |
1644 | if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
1645 | if (XFS_IFORK_BOFF(tip) && | |
1646 | XFS_BMAP_BMDR_SPACE(ip->i_df.if_broot) > XFS_IFORK_BOFF(tip)) | |
2451337d | 1647 | return -EINVAL; |
a133d952 DC |
1648 | if (XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) <= |
1649 | XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK)) | |
2451337d | 1650 | return -EINVAL; |
a133d952 DC |
1651 | } |
1652 | ||
1653 | return 0; | |
1654 | } | |
1655 | ||
7abbb8f9 | 1656 | static int |
4ef897a2 DC |
1657 | xfs_swap_extent_flush( |
1658 | struct xfs_inode *ip) | |
1659 | { | |
1660 | int error; | |
1661 | ||
1662 | error = filemap_write_and_wait(VFS_I(ip)->i_mapping); | |
1663 | if (error) | |
1664 | return error; | |
1665 | truncate_pagecache_range(VFS_I(ip), 0, -1); | |
1666 | ||
1667 | /* Verify O_DIRECT for ftmp */ | |
1668 | if (VFS_I(ip)->i_mapping->nrpages) | |
1669 | return -EINVAL; | |
4ef897a2 DC |
1670 | return 0; |
1671 | } | |
1672 | ||
a133d952 DC |
1673 | int |
1674 | xfs_swap_extents( | |
1675 | xfs_inode_t *ip, /* target inode */ | |
1676 | xfs_inode_t *tip, /* tmp inode */ | |
1677 | xfs_swapext_t *sxp) | |
1678 | { | |
1679 | xfs_mount_t *mp = ip->i_mount; | |
1680 | xfs_trans_t *tp; | |
1681 | xfs_bstat_t *sbp = &sxp->sx_stat; | |
1682 | xfs_ifork_t *tempifp, *ifp, *tifp; | |
1683 | int src_log_flags, target_log_flags; | |
1684 | int error = 0; | |
1685 | int aforkblks = 0; | |
1686 | int taforkblks = 0; | |
1687 | __uint64_t tmp; | |
81217683 | 1688 | int lock_flags; |
a133d952 | 1689 | |
a133d952 DC |
1690 | tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL); |
1691 | if (!tempifp) { | |
2451337d | 1692 | error = -ENOMEM; |
a133d952 DC |
1693 | goto out; |
1694 | } | |
1695 | ||
1696 | /* | |
723cac48 DC |
1697 | * Lock the inodes against other IO, page faults and truncate to |
1698 | * begin with. Then we can ensure the inodes are flushed and have no | |
1699 | * page cache safely. Once we have done this we can take the ilocks and | |
1700 | * do the rest of the checks. | |
a133d952 | 1701 | */ |
723cac48 | 1702 | lock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; |
a133d952 | 1703 | xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL); |
723cac48 | 1704 | xfs_lock_two_inodes(ip, tip, XFS_MMAPLOCK_EXCL); |
a133d952 DC |
1705 | |
1706 | /* Verify that both files have the same format */ | |
c19b3b05 | 1707 | if ((VFS_I(ip)->i_mode & S_IFMT) != (VFS_I(tip)->i_mode & S_IFMT)) { |
2451337d | 1708 | error = -EINVAL; |
a133d952 DC |
1709 | goto out_unlock; |
1710 | } | |
1711 | ||
1712 | /* Verify both files are either real-time or non-realtime */ | |
1713 | if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) { | |
2451337d | 1714 | error = -EINVAL; |
a133d952 DC |
1715 | goto out_unlock; |
1716 | } | |
1717 | ||
4ef897a2 DC |
1718 | error = xfs_swap_extent_flush(ip); |
1719 | if (error) | |
1720 | goto out_unlock; | |
1721 | error = xfs_swap_extent_flush(tip); | |
a133d952 DC |
1722 | if (error) |
1723 | goto out_unlock; | |
a133d952 | 1724 | |
253f4911 CH |
1725 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp); |
1726 | if (error) | |
a133d952 | 1727 | goto out_unlock; |
723cac48 DC |
1728 | |
1729 | /* | |
1730 | * Lock and join the inodes to the tansaction so that transaction commit | |
1731 | * or cancel will unlock the inodes from this point onwards. | |
1732 | */ | |
4ef897a2 DC |
1733 | xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL); |
1734 | lock_flags |= XFS_ILOCK_EXCL; | |
723cac48 DC |
1735 | xfs_trans_ijoin(tp, ip, lock_flags); |
1736 | xfs_trans_ijoin(tp, tip, lock_flags); | |
1737 | ||
a133d952 DC |
1738 | |
1739 | /* Verify all data are being swapped */ | |
1740 | if (sxp->sx_offset != 0 || | |
1741 | sxp->sx_length != ip->i_d.di_size || | |
1742 | sxp->sx_length != tip->i_d.di_size) { | |
2451337d | 1743 | error = -EFAULT; |
4ef897a2 | 1744 | goto out_trans_cancel; |
a133d952 DC |
1745 | } |
1746 | ||
1747 | trace_xfs_swap_extent_before(ip, 0); | |
1748 | trace_xfs_swap_extent_before(tip, 1); | |
1749 | ||
1750 | /* check inode formats now that data is flushed */ | |
1751 | error = xfs_swap_extents_check_format(ip, tip); | |
1752 | if (error) { | |
1753 | xfs_notice(mp, | |
1754 | "%s: inode 0x%llx format is incompatible for exchanging.", | |
1755 | __func__, ip->i_ino); | |
4ef897a2 | 1756 | goto out_trans_cancel; |
a133d952 DC |
1757 | } |
1758 | ||
1759 | /* | |
1760 | * Compare the current change & modify times with that | |
1761 | * passed in. If they differ, we abort this swap. | |
1762 | * This is the mechanism used to ensure the calling | |
1763 | * process that the file was not changed out from | |
1764 | * under it. | |
1765 | */ | |
1766 | if ((sbp->bs_ctime.tv_sec != VFS_I(ip)->i_ctime.tv_sec) || | |
1767 | (sbp->bs_ctime.tv_nsec != VFS_I(ip)->i_ctime.tv_nsec) || | |
1768 | (sbp->bs_mtime.tv_sec != VFS_I(ip)->i_mtime.tv_sec) || | |
1769 | (sbp->bs_mtime.tv_nsec != VFS_I(ip)->i_mtime.tv_nsec)) { | |
2451337d | 1770 | error = -EBUSY; |
81217683 | 1771 | goto out_trans_cancel; |
a133d952 | 1772 | } |
a133d952 DC |
1773 | /* |
1774 | * Count the number of extended attribute blocks | |
1775 | */ | |
1776 | if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) && | |
1777 | (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
1778 | error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks); | |
1779 | if (error) | |
1780 | goto out_trans_cancel; | |
1781 | } | |
1782 | if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) && | |
1783 | (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
1784 | error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK, | |
1785 | &taforkblks); | |
1786 | if (error) | |
1787 | goto out_trans_cancel; | |
1788 | } | |
1789 | ||
21b5c978 DC |
1790 | /* |
1791 | * Before we've swapped the forks, lets set the owners of the forks | |
1792 | * appropriately. We have to do this as we are demand paging the btree | |
1793 | * buffers, and so the validation done on read will expect the owner | |
1794 | * field to be correctly set. Once we change the owners, we can swap the | |
1795 | * inode forks. | |
1796 | * | |
1797 | * Note the trickiness in setting the log flags - we set the owner log | |
1798 | * flag on the opposite inode (i.e. the inode we are setting the new | |
1799 | * owner to be) because once we swap the forks and log that, log | |
1800 | * recovery is going to see the fork as owned by the swapped inode, | |
1801 | * not the pre-swapped inodes. | |
1802 | */ | |
1803 | src_log_flags = XFS_ILOG_CORE; | |
1804 | target_log_flags = XFS_ILOG_CORE; | |
1805 | if (ip->i_d.di_version == 3 && | |
1806 | ip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
638f4416 DC |
1807 | target_log_flags |= XFS_ILOG_DOWNER; |
1808 | error = xfs_bmbt_change_owner(tp, ip, XFS_DATA_FORK, | |
1809 | tip->i_ino, NULL); | |
21b5c978 DC |
1810 | if (error) |
1811 | goto out_trans_cancel; | |
1812 | } | |
1813 | ||
1814 | if (tip->i_d.di_version == 3 && | |
1815 | tip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
638f4416 DC |
1816 | src_log_flags |= XFS_ILOG_DOWNER; |
1817 | error = xfs_bmbt_change_owner(tp, tip, XFS_DATA_FORK, | |
1818 | ip->i_ino, NULL); | |
21b5c978 DC |
1819 | if (error) |
1820 | goto out_trans_cancel; | |
1821 | } | |
1822 | ||
a133d952 DC |
1823 | /* |
1824 | * Swap the data forks of the inodes | |
1825 | */ | |
1826 | ifp = &ip->i_df; | |
1827 | tifp = &tip->i_df; | |
1828 | *tempifp = *ifp; /* struct copy */ | |
1829 | *ifp = *tifp; /* struct copy */ | |
1830 | *tifp = *tempifp; /* struct copy */ | |
1831 | ||
1832 | /* | |
1833 | * Fix the on-disk inode values | |
1834 | */ | |
1835 | tmp = (__uint64_t)ip->i_d.di_nblocks; | |
1836 | ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks; | |
1837 | tip->i_d.di_nblocks = tmp + taforkblks - aforkblks; | |
1838 | ||
1839 | tmp = (__uint64_t) ip->i_d.di_nextents; | |
1840 | ip->i_d.di_nextents = tip->i_d.di_nextents; | |
1841 | tip->i_d.di_nextents = tmp; | |
1842 | ||
1843 | tmp = (__uint64_t) ip->i_d.di_format; | |
1844 | ip->i_d.di_format = tip->i_d.di_format; | |
1845 | tip->i_d.di_format = tmp; | |
1846 | ||
1847 | /* | |
1848 | * The extents in the source inode could still contain speculative | |
1849 | * preallocation beyond EOF (e.g. the file is open but not modified | |
1850 | * while defrag is in progress). In that case, we need to copy over the | |
1851 | * number of delalloc blocks the data fork in the source inode is | |
1852 | * tracking beyond EOF so that when the fork is truncated away when the | |
1853 | * temporary inode is unlinked we don't underrun the i_delayed_blks | |
1854 | * counter on that inode. | |
1855 | */ | |
1856 | ASSERT(tip->i_delayed_blks == 0); | |
1857 | tip->i_delayed_blks = ip->i_delayed_blks; | |
1858 | ip->i_delayed_blks = 0; | |
1859 | ||
a133d952 DC |
1860 | switch (ip->i_d.di_format) { |
1861 | case XFS_DINODE_FMT_EXTENTS: | |
1862 | /* If the extents fit in the inode, fix the | |
1863 | * pointer. Otherwise it's already NULL or | |
1864 | * pointing to the extent. | |
1865 | */ | |
1866 | if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) { | |
1867 | ifp->if_u1.if_extents = | |
1868 | ifp->if_u2.if_inline_ext; | |
1869 | } | |
1870 | src_log_flags |= XFS_ILOG_DEXT; | |
1871 | break; | |
1872 | case XFS_DINODE_FMT_BTREE: | |
21b5c978 | 1873 | ASSERT(ip->i_d.di_version < 3 || |
638f4416 | 1874 | (src_log_flags & XFS_ILOG_DOWNER)); |
a133d952 DC |
1875 | src_log_flags |= XFS_ILOG_DBROOT; |
1876 | break; | |
1877 | } | |
1878 | ||
a133d952 DC |
1879 | switch (tip->i_d.di_format) { |
1880 | case XFS_DINODE_FMT_EXTENTS: | |
1881 | /* If the extents fit in the inode, fix the | |
1882 | * pointer. Otherwise it's already NULL or | |
1883 | * pointing to the extent. | |
1884 | */ | |
1885 | if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) { | |
1886 | tifp->if_u1.if_extents = | |
1887 | tifp->if_u2.if_inline_ext; | |
1888 | } | |
1889 | target_log_flags |= XFS_ILOG_DEXT; | |
1890 | break; | |
1891 | case XFS_DINODE_FMT_BTREE: | |
1892 | target_log_flags |= XFS_ILOG_DBROOT; | |
21b5c978 | 1893 | ASSERT(tip->i_d.di_version < 3 || |
638f4416 | 1894 | (target_log_flags & XFS_ILOG_DOWNER)); |
a133d952 DC |
1895 | break; |
1896 | } | |
1897 | ||
a133d952 DC |
1898 | xfs_trans_log_inode(tp, ip, src_log_flags); |
1899 | xfs_trans_log_inode(tp, tip, target_log_flags); | |
1900 | ||
1901 | /* | |
1902 | * If this is a synchronous mount, make sure that the | |
1903 | * transaction goes to disk before returning to the user. | |
1904 | */ | |
1905 | if (mp->m_flags & XFS_MOUNT_WSYNC) | |
1906 | xfs_trans_set_sync(tp); | |
1907 | ||
70393313 | 1908 | error = xfs_trans_commit(tp); |
a133d952 DC |
1909 | |
1910 | trace_xfs_swap_extent_after(ip, 0); | |
1911 | trace_xfs_swap_extent_after(tip, 1); | |
1912 | out: | |
1913 | kmem_free(tempifp); | |
1914 | return error; | |
1915 | ||
1916 | out_unlock: | |
81217683 DC |
1917 | xfs_iunlock(ip, lock_flags); |
1918 | xfs_iunlock(tip, lock_flags); | |
a133d952 DC |
1919 | goto out; |
1920 | ||
1921 | out_trans_cancel: | |
4906e215 | 1922 | xfs_trans_cancel(tp); |
723cac48 | 1923 | goto out; |
a133d952 | 1924 | } |