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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" |
3ab78df2 | 28 | #include "xfs_defer.h" |
68988114 DC |
29 | #include "xfs_inode.h" |
30 | #include "xfs_btree.h" | |
239880ef | 31 | #include "xfs_trans.h" |
68988114 DC |
32 | #include "xfs_extfree_item.h" |
33 | #include "xfs_alloc.h" | |
34 | #include "xfs_bmap.h" | |
35 | #include "xfs_bmap_util.h" | |
a4fbe6ab | 36 | #include "xfs_bmap_btree.h" |
68988114 DC |
37 | #include "xfs_rtalloc.h" |
38 | #include "xfs_error.h" | |
39 | #include "xfs_quota.h" | |
40 | #include "xfs_trans_space.h" | |
41 | #include "xfs_trace.h" | |
c24b5dfa | 42 | #include "xfs_icache.h" |
239880ef | 43 | #include "xfs_log.h" |
9c194644 | 44 | #include "xfs_rmap_btree.h" |
f86f4037 DW |
45 | #include "xfs_iomap.h" |
46 | #include "xfs_reflink.h" | |
47 | #include "xfs_refcount.h" | |
68988114 DC |
48 | |
49 | /* Kernel only BMAP related definitions and functions */ | |
50 | ||
51 | /* | |
52 | * Convert the given file system block to a disk block. We have to treat it | |
53 | * differently based on whether the file is a real time file or not, because the | |
54 | * bmap code does. | |
55 | */ | |
56 | xfs_daddr_t | |
57 | xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb) | |
58 | { | |
59 | return (XFS_IS_REALTIME_INODE(ip) ? \ | |
60 | (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \ | |
61 | XFS_FSB_TO_DADDR((ip)->i_mount, (fsb))); | |
62 | } | |
63 | ||
3fbbbea3 DC |
64 | /* |
65 | * Routine to zero an extent on disk allocated to the specific inode. | |
66 | * | |
67 | * The VFS functions take a linearised filesystem block offset, so we have to | |
68 | * convert the sparse xfs fsb to the right format first. | |
69 | * VFS types are real funky, too. | |
70 | */ | |
71 | int | |
72 | xfs_zero_extent( | |
73 | struct xfs_inode *ip, | |
74 | xfs_fsblock_t start_fsb, | |
75 | xfs_off_t count_fsb) | |
76 | { | |
77 | struct xfs_mount *mp = ip->i_mount; | |
78 | xfs_daddr_t sector = xfs_fsb_to_db(ip, start_fsb); | |
79 | sector_t block = XFS_BB_TO_FSBT(mp, sector); | |
3fbbbea3 | 80 | |
3dc29161 MW |
81 | return blkdev_issue_zeroout(xfs_find_bdev_for_inode(VFS_I(ip)), |
82 | block << (mp->m_super->s_blocksize_bits - 9), | |
83 | count_fsb << (mp->m_super->s_blocksize_bits - 9), | |
ee472d83 | 84 | GFP_NOFS, 0); |
3fbbbea3 DC |
85 | } |
86 | ||
68988114 DC |
87 | int |
88 | xfs_bmap_rtalloc( | |
89 | struct xfs_bmalloca *ap) /* bmap alloc argument struct */ | |
90 | { | |
68988114 DC |
91 | int error; /* error return value */ |
92 | xfs_mount_t *mp; /* mount point structure */ | |
93 | xfs_extlen_t prod = 0; /* product factor for allocators */ | |
94 | xfs_extlen_t ralen = 0; /* realtime allocation length */ | |
95 | xfs_extlen_t align; /* minimum allocation alignment */ | |
96 | xfs_rtblock_t rtb; | |
97 | ||
98 | mp = ap->ip->i_mount; | |
99 | align = xfs_get_extsz_hint(ap->ip); | |
100 | prod = align / mp->m_sb.sb_rextsize; | |
101 | error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, | |
102 | align, 1, ap->eof, 0, | |
103 | ap->conv, &ap->offset, &ap->length); | |
104 | if (error) | |
105 | return error; | |
106 | ASSERT(ap->length); | |
107 | ASSERT(ap->length % mp->m_sb.sb_rextsize == 0); | |
108 | ||
109 | /* | |
110 | * If the offset & length are not perfectly aligned | |
111 | * then kill prod, it will just get us in trouble. | |
112 | */ | |
113 | if (do_mod(ap->offset, align) || ap->length % align) | |
114 | prod = 1; | |
115 | /* | |
116 | * Set ralen to be the actual requested length in rtextents. | |
117 | */ | |
118 | ralen = ap->length / mp->m_sb.sb_rextsize; | |
119 | /* | |
120 | * If the old value was close enough to MAXEXTLEN that | |
121 | * we rounded up to it, cut it back so it's valid again. | |
122 | * Note that if it's a really large request (bigger than | |
123 | * MAXEXTLEN), we don't hear about that number, and can't | |
124 | * adjust the starting point to match it. | |
125 | */ | |
126 | if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN) | |
127 | ralen = MAXEXTLEN / mp->m_sb.sb_rextsize; | |
128 | ||
129 | /* | |
4b680afb | 130 | * Lock out modifications to both the RT bitmap and summary inodes |
68988114 | 131 | */ |
f4a0660d | 132 | xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP); |
68988114 | 133 | xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL); |
f4a0660d | 134 | xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM); |
4b680afb | 135 | xfs_trans_ijoin(ap->tp, mp->m_rsumip, XFS_ILOCK_EXCL); |
68988114 DC |
136 | |
137 | /* | |
138 | * If it's an allocation to an empty file at offset 0, | |
139 | * pick an extent that will space things out in the rt area. | |
140 | */ | |
141 | if (ap->eof && ap->offset == 0) { | |
142 | xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */ | |
143 | ||
144 | error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx); | |
145 | if (error) | |
146 | return error; | |
147 | ap->blkno = rtx * mp->m_sb.sb_rextsize; | |
148 | } else { | |
149 | ap->blkno = 0; | |
150 | } | |
151 | ||
152 | xfs_bmap_adjacent(ap); | |
153 | ||
154 | /* | |
155 | * Realtime allocation, done through xfs_rtallocate_extent. | |
156 | */ | |
68988114 DC |
157 | do_div(ap->blkno, mp->m_sb.sb_rextsize); |
158 | rtb = ap->blkno; | |
159 | ap->length = ralen; | |
089ec2f8 CH |
160 | error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, ap->length, |
161 | &ralen, ap->wasdel, prod, &rtb); | |
162 | if (error) | |
68988114 | 163 | return error; |
089ec2f8 | 164 | |
68988114 DC |
165 | ap->blkno = rtb; |
166 | if (ap->blkno != NULLFSBLOCK) { | |
167 | ap->blkno *= mp->m_sb.sb_rextsize; | |
168 | ralen *= mp->m_sb.sb_rextsize; | |
169 | ap->length = ralen; | |
170 | ap->ip->i_d.di_nblocks += ralen; | |
171 | xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE); | |
172 | if (ap->wasdel) | |
173 | ap->ip->i_delayed_blks -= ralen; | |
174 | /* | |
175 | * Adjust the disk quota also. This was reserved | |
176 | * earlier. | |
177 | */ | |
178 | xfs_trans_mod_dquot_byino(ap->tp, ap->ip, | |
179 | ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT : | |
180 | XFS_TRANS_DQ_RTBCOUNT, (long) ralen); | |
3fbbbea3 DC |
181 | |
182 | /* Zero the extent if we were asked to do so */ | |
292378ed | 183 | if (ap->datatype & XFS_ALLOC_USERDATA_ZERO) { |
3fbbbea3 DC |
184 | error = xfs_zero_extent(ap->ip, ap->blkno, ap->length); |
185 | if (error) | |
186 | return error; | |
187 | } | |
68988114 DC |
188 | } else { |
189 | ap->length = 0; | |
190 | } | |
191 | return 0; | |
192 | } | |
193 | ||
68988114 DC |
194 | /* |
195 | * Check if the endoff is outside the last extent. If so the caller will grow | |
196 | * the allocation to a stripe unit boundary. All offsets are considered outside | |
197 | * the end of file for an empty fork, so 1 is returned in *eof in that case. | |
198 | */ | |
199 | int | |
200 | xfs_bmap_eof( | |
201 | struct xfs_inode *ip, | |
202 | xfs_fileoff_t endoff, | |
203 | int whichfork, | |
204 | int *eof) | |
205 | { | |
206 | struct xfs_bmbt_irec rec; | |
207 | int error; | |
208 | ||
209 | error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, eof); | |
210 | if (error || *eof) | |
211 | return error; | |
212 | ||
213 | *eof = endoff >= rec.br_startoff + rec.br_blockcount; | |
214 | return 0; | |
215 | } | |
216 | ||
217 | /* | |
218 | * Extent tree block counting routines. | |
219 | */ | |
220 | ||
221 | /* | |
d29cb3e4 DW |
222 | * Count leaf blocks given a range of extent records. Delayed allocation |
223 | * extents are not counted towards the totals. | |
68988114 DC |
224 | */ |
225 | STATIC void | |
226 | xfs_bmap_count_leaves( | |
d29cb3e4 | 227 | struct xfs_ifork *ifp, |
e7f5d5ca DW |
228 | xfs_extnum_t *numrecs, |
229 | xfs_filblks_t *count) | |
68988114 | 230 | { |
d29cb3e4 DW |
231 | xfs_extnum_t i; |
232 | xfs_extnum_t nr_exts = xfs_iext_count(ifp); | |
68988114 | 233 | |
d29cb3e4 DW |
234 | for (i = 0; i < nr_exts; i++) { |
235 | xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, i); | |
236 | if (!isnullstartblock(xfs_bmbt_get_startblock(frp))) { | |
e7f5d5ca | 237 | (*numrecs)++; |
d29cb3e4 DW |
238 | *count += xfs_bmbt_get_blockcount(frp); |
239 | } | |
68988114 DC |
240 | } |
241 | } | |
242 | ||
243 | /* | |
244 | * Count leaf blocks given a range of extent records originally | |
245 | * in btree format. | |
246 | */ | |
247 | STATIC void | |
248 | xfs_bmap_disk_count_leaves( | |
249 | struct xfs_mount *mp, | |
250 | struct xfs_btree_block *block, | |
251 | int numrecs, | |
e7f5d5ca | 252 | xfs_filblks_t *count) |
68988114 DC |
253 | { |
254 | int b; | |
255 | xfs_bmbt_rec_t *frp; | |
256 | ||
257 | for (b = 1; b <= numrecs; b++) { | |
258 | frp = XFS_BMBT_REC_ADDR(mp, block, b); | |
259 | *count += xfs_bmbt_disk_get_blockcount(frp); | |
260 | } | |
261 | } | |
262 | ||
263 | /* | |
264 | * Recursively walks each level of a btree | |
8be11e92 | 265 | * to count total fsblocks in use. |
68988114 | 266 | */ |
e7f5d5ca | 267 | STATIC int |
68988114 | 268 | xfs_bmap_count_tree( |
e7f5d5ca DW |
269 | struct xfs_mount *mp, |
270 | struct xfs_trans *tp, | |
271 | struct xfs_ifork *ifp, | |
272 | xfs_fsblock_t blockno, | |
273 | int levelin, | |
274 | xfs_extnum_t *nextents, | |
275 | xfs_filblks_t *count) | |
68988114 DC |
276 | { |
277 | int error; | |
e7f5d5ca | 278 | struct xfs_buf *bp, *nbp; |
68988114 DC |
279 | int level = levelin; |
280 | __be64 *pp; | |
281 | xfs_fsblock_t bno = blockno; | |
282 | xfs_fsblock_t nextbno; | |
283 | struct xfs_btree_block *block, *nextblock; | |
284 | int numrecs; | |
285 | ||
286 | error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF, | |
287 | &xfs_bmbt_buf_ops); | |
288 | if (error) | |
289 | return error; | |
290 | *count += 1; | |
291 | block = XFS_BUF_TO_BLOCK(bp); | |
292 | ||
293 | if (--level) { | |
294 | /* Not at node above leaves, count this level of nodes */ | |
295 | nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib); | |
296 | while (nextbno != NULLFSBLOCK) { | |
297 | error = xfs_btree_read_bufl(mp, tp, nextbno, 0, &nbp, | |
298 | XFS_BMAP_BTREE_REF, | |
299 | &xfs_bmbt_buf_ops); | |
300 | if (error) | |
301 | return error; | |
302 | *count += 1; | |
303 | nextblock = XFS_BUF_TO_BLOCK(nbp); | |
304 | nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib); | |
305 | xfs_trans_brelse(tp, nbp); | |
306 | } | |
307 | ||
308 | /* Dive to the next level */ | |
309 | pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]); | |
310 | bno = be64_to_cpu(*pp); | |
e7f5d5ca DW |
311 | error = xfs_bmap_count_tree(mp, tp, ifp, bno, level, nextents, |
312 | count); | |
313 | if (error) { | |
68988114 DC |
314 | xfs_trans_brelse(tp, bp); |
315 | XFS_ERROR_REPORT("xfs_bmap_count_tree(1)", | |
316 | XFS_ERRLEVEL_LOW, mp); | |
2451337d | 317 | return -EFSCORRUPTED; |
68988114 DC |
318 | } |
319 | xfs_trans_brelse(tp, bp); | |
320 | } else { | |
321 | /* count all level 1 nodes and their leaves */ | |
322 | for (;;) { | |
323 | nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib); | |
324 | numrecs = be16_to_cpu(block->bb_numrecs); | |
e7f5d5ca | 325 | (*nextents) += numrecs; |
68988114 DC |
326 | xfs_bmap_disk_count_leaves(mp, block, numrecs, count); |
327 | xfs_trans_brelse(tp, bp); | |
328 | if (nextbno == NULLFSBLOCK) | |
329 | break; | |
330 | bno = nextbno; | |
331 | error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, | |
332 | XFS_BMAP_BTREE_REF, | |
333 | &xfs_bmbt_buf_ops); | |
334 | if (error) | |
335 | return error; | |
336 | *count += 1; | |
337 | block = XFS_BUF_TO_BLOCK(bp); | |
338 | } | |
339 | } | |
340 | return 0; | |
341 | } | |
342 | ||
343 | /* | |
d29cb3e4 DW |
344 | * Count fsblocks of the given fork. Delayed allocation extents are |
345 | * not counted towards the totals. | |
68988114 | 346 | */ |
e7f5d5ca | 347 | int |
68988114 | 348 | xfs_bmap_count_blocks( |
e7f5d5ca DW |
349 | struct xfs_trans *tp, |
350 | struct xfs_inode *ip, | |
351 | int whichfork, | |
352 | xfs_extnum_t *nextents, | |
353 | xfs_filblks_t *count) | |
68988114 | 354 | { |
e7f5d5ca DW |
355 | struct xfs_mount *mp; /* file system mount structure */ |
356 | __be64 *pp; /* pointer to block address */ | |
68988114 | 357 | struct xfs_btree_block *block; /* current btree block */ |
e7f5d5ca | 358 | struct xfs_ifork *ifp; /* fork structure */ |
68988114 | 359 | xfs_fsblock_t bno; /* block # of "block" */ |
68988114 | 360 | int level; /* btree level, for checking */ |
e7f5d5ca | 361 | int error; |
68988114 DC |
362 | |
363 | bno = NULLFSBLOCK; | |
364 | mp = ip->i_mount; | |
e7f5d5ca DW |
365 | *nextents = 0; |
366 | *count = 0; | |
68988114 | 367 | ifp = XFS_IFORK_PTR(ip, whichfork); |
e7f5d5ca | 368 | if (!ifp) |
68988114 | 369 | return 0; |
68988114 | 370 | |
e7f5d5ca DW |
371 | switch (XFS_IFORK_FORMAT(ip, whichfork)) { |
372 | case XFS_DINODE_FMT_EXTENTS: | |
373 | xfs_bmap_count_leaves(ifp, nextents, count); | |
374 | return 0; | |
375 | case XFS_DINODE_FMT_BTREE: | |
376 | if (!(ifp->if_flags & XFS_IFEXTENTS)) { | |
377 | error = xfs_iread_extents(tp, ip, whichfork); | |
378 | if (error) | |
379 | return error; | |
380 | } | |
381 | ||
382 | /* | |
383 | * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out. | |
384 | */ | |
385 | block = ifp->if_broot; | |
386 | level = be16_to_cpu(block->bb_level); | |
387 | ASSERT(level > 0); | |
388 | pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes); | |
389 | bno = be64_to_cpu(*pp); | |
390 | ASSERT(bno != NULLFSBLOCK); | |
391 | ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount); | |
392 | ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks); | |
393 | ||
394 | error = xfs_bmap_count_tree(mp, tp, ifp, bno, level, | |
395 | nextents, count); | |
396 | if (error) { | |
397 | XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", | |
398 | XFS_ERRLEVEL_LOW, mp); | |
399 | return -EFSCORRUPTED; | |
400 | } | |
401 | return 0; | |
68988114 DC |
402 | } |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | /* | |
408 | * returns 1 for success, 0 if we failed to map the extent. | |
409 | */ | |
410 | STATIC int | |
411 | xfs_getbmapx_fix_eof_hole( | |
412 | xfs_inode_t *ip, /* xfs incore inode pointer */ | |
f86f4037 | 413 | int whichfork, |
68988114 DC |
414 | struct getbmapx *out, /* output structure */ |
415 | int prealloced, /* this is a file with | |
416 | * preallocated data space */ | |
c8ce540d | 417 | int64_t end, /* last block requested */ |
f86f4037 DW |
418 | xfs_fsblock_t startblock, |
419 | bool moretocome) | |
68988114 | 420 | { |
c8ce540d | 421 | int64_t fixlen; |
68988114 DC |
422 | xfs_mount_t *mp; /* file system mount point */ |
423 | xfs_ifork_t *ifp; /* inode fork pointer */ | |
424 | xfs_extnum_t lastx; /* last extent pointer */ | |
425 | xfs_fileoff_t fileblock; | |
426 | ||
427 | if (startblock == HOLESTARTBLOCK) { | |
428 | mp = ip->i_mount; | |
429 | out->bmv_block = -1; | |
430 | fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, XFS_ISIZE(ip))); | |
431 | fixlen -= out->bmv_offset; | |
432 | if (prealloced && out->bmv_offset + out->bmv_length == end) { | |
433 | /* Came to hole at EOF. Trim it. */ | |
434 | if (fixlen <= 0) | |
435 | return 0; | |
436 | out->bmv_length = fixlen; | |
437 | } | |
438 | } else { | |
439 | if (startblock == DELAYSTARTBLOCK) | |
440 | out->bmv_block = -2; | |
441 | else | |
442 | out->bmv_block = xfs_fsb_to_db(ip, startblock); | |
443 | fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset); | |
f86f4037 DW |
444 | ifp = XFS_IFORK_PTR(ip, whichfork); |
445 | if (!moretocome && | |
446 | xfs_iext_bno_to_ext(ifp, fileblock, &lastx) && | |
5d829300 | 447 | (lastx == xfs_iext_count(ifp) - 1)) |
68988114 DC |
448 | out->bmv_oflags |= BMV_OF_LAST; |
449 | } | |
450 | ||
451 | return 1; | |
452 | } | |
453 | ||
f86f4037 DW |
454 | /* Adjust the reported bmap around shared/unshared extent transitions. */ |
455 | STATIC int | |
456 | xfs_getbmap_adjust_shared( | |
457 | struct xfs_inode *ip, | |
458 | int whichfork, | |
459 | struct xfs_bmbt_irec *map, | |
460 | struct getbmapx *out, | |
461 | struct xfs_bmbt_irec *next_map) | |
462 | { | |
463 | struct xfs_mount *mp = ip->i_mount; | |
464 | xfs_agnumber_t agno; | |
465 | xfs_agblock_t agbno; | |
466 | xfs_agblock_t ebno; | |
467 | xfs_extlen_t elen; | |
468 | xfs_extlen_t nlen; | |
469 | int error; | |
470 | ||
471 | next_map->br_startblock = NULLFSBLOCK; | |
472 | next_map->br_startoff = NULLFILEOFF; | |
473 | next_map->br_blockcount = 0; | |
474 | ||
475 | /* Only written data blocks can be shared. */ | |
9c4f29d3 CH |
476 | if (!xfs_is_reflink_inode(ip) || |
477 | whichfork != XFS_DATA_FORK || | |
478 | !xfs_bmap_is_real_extent(map)) | |
f86f4037 DW |
479 | return 0; |
480 | ||
481 | agno = XFS_FSB_TO_AGNO(mp, map->br_startblock); | |
482 | agbno = XFS_FSB_TO_AGBNO(mp, map->br_startblock); | |
92ff7285 DW |
483 | error = xfs_reflink_find_shared(mp, NULL, agno, agbno, |
484 | map->br_blockcount, &ebno, &elen, true); | |
f86f4037 DW |
485 | if (error) |
486 | return error; | |
487 | ||
488 | if (ebno == NULLAGBLOCK) { | |
489 | /* No shared blocks at all. */ | |
490 | return 0; | |
491 | } else if (agbno == ebno) { | |
492 | /* | |
493 | * Shared extent at (agbno, elen). Shrink the reported | |
494 | * extent length and prepare to move the start of map[i] | |
495 | * to agbno+elen, with the aim of (re)formatting the new | |
496 | * map[i] the next time through the inner loop. | |
497 | */ | |
498 | out->bmv_length = XFS_FSB_TO_BB(mp, elen); | |
499 | out->bmv_oflags |= BMV_OF_SHARED; | |
500 | if (elen != map->br_blockcount) { | |
501 | *next_map = *map; | |
502 | next_map->br_startblock += elen; | |
503 | next_map->br_startoff += elen; | |
504 | next_map->br_blockcount -= elen; | |
505 | } | |
506 | map->br_blockcount -= elen; | |
507 | } else { | |
508 | /* | |
509 | * There's an unshared extent (agbno, ebno - agbno) | |
510 | * followed by shared extent at (ebno, elen). Shrink | |
511 | * the reported extent length to cover only the unshared | |
512 | * extent and prepare to move up the start of map[i] to | |
513 | * ebno, with the aim of (re)formatting the new map[i] | |
514 | * the next time through the inner loop. | |
515 | */ | |
516 | *next_map = *map; | |
517 | nlen = ebno - agbno; | |
518 | out->bmv_length = XFS_FSB_TO_BB(mp, nlen); | |
519 | next_map->br_startblock += nlen; | |
520 | next_map->br_startoff += nlen; | |
521 | next_map->br_blockcount -= nlen; | |
522 | map->br_blockcount -= nlen; | |
523 | } | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
68988114 DC |
528 | /* |
529 | * Get inode's extents as described in bmv, and format for output. | |
530 | * Calls formatter to fill the user's buffer until all extents | |
531 | * are mapped, until the passed-in bmv->bmv_count slots have | |
532 | * been filled, or until the formatter short-circuits the loop, | |
533 | * if it is tracking filled-in extents on its own. | |
534 | */ | |
535 | int /* error code */ | |
536 | xfs_getbmap( | |
537 | xfs_inode_t *ip, | |
538 | struct getbmapx *bmv, /* user bmap structure */ | |
539 | xfs_bmap_format_t formatter, /* format to user */ | |
540 | void *arg) /* formatter arg */ | |
541 | { | |
c8ce540d | 542 | int64_t bmvend; /* last block requested */ |
68988114 | 543 | int error = 0; /* return value */ |
c8ce540d | 544 | int64_t fixlen; /* length for -1 case */ |
68988114 DC |
545 | int i; /* extent number */ |
546 | int lock; /* lock state */ | |
547 | xfs_bmbt_irec_t *map; /* buffer for user's data */ | |
548 | xfs_mount_t *mp; /* file system mount point */ | |
549 | int nex; /* # of user extents can do */ | |
68988114 DC |
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; | |
f86f4037 | 559 | struct xfs_bmbt_irec inject_map; |
68988114 DC |
560 | |
561 | mp = ip->i_mount; | |
562 | iflags = bmv->bmv_iflags; | |
68988114 | 563 | |
f86f4037 DW |
564 | #ifndef DEBUG |
565 | /* Only allow CoW fork queries if we're debugging. */ | |
566 | if (iflags & BMV_IF_COWFORK) | |
567 | return -EINVAL; | |
568 | #endif | |
569 | if ((iflags & BMV_IF_ATTRFORK) && (iflags & BMV_IF_COWFORK)) | |
570 | return -EINVAL; | |
571 | ||
572 | if (iflags & BMV_IF_ATTRFORK) | |
573 | whichfork = XFS_ATTR_FORK; | |
574 | else if (iflags & BMV_IF_COWFORK) | |
575 | whichfork = XFS_COW_FORK; | |
576 | else | |
577 | whichfork = XFS_DATA_FORK; | |
578 | ||
579 | switch (whichfork) { | |
580 | case XFS_ATTR_FORK: | |
68988114 DC |
581 | if (XFS_IFORK_Q(ip)) { |
582 | if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS && | |
583 | ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE && | |
584 | ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL) | |
2451337d | 585 | return -EINVAL; |
68988114 DC |
586 | } else if (unlikely( |
587 | ip->i_d.di_aformat != 0 && | |
588 | ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) { | |
589 | XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW, | |
590 | ip->i_mount); | |
2451337d | 591 | return -EFSCORRUPTED; |
68988114 DC |
592 | } |
593 | ||
594 | prealloced = 0; | |
595 | fixlen = 1LL << 32; | |
f86f4037 DW |
596 | break; |
597 | case XFS_COW_FORK: | |
598 | if (ip->i_cformat != XFS_DINODE_FMT_EXTENTS) | |
599 | return -EINVAL; | |
600 | ||
f7ca3522 DW |
601 | if (xfs_get_cowextsz_hint(ip)) { |
602 | prealloced = 1; | |
603 | fixlen = mp->m_super->s_maxbytes; | |
604 | } else { | |
605 | prealloced = 0; | |
606 | fixlen = XFS_ISIZE(ip); | |
607 | } | |
f86f4037 DW |
608 | break; |
609 | default: | |
6eadbf4c DW |
610 | /* Local format data forks report no extents. */ |
611 | if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL) { | |
612 | bmv->bmv_entries = 0; | |
613 | return 0; | |
614 | } | |
68988114 | 615 | if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS && |
6eadbf4c | 616 | ip->i_d.di_format != XFS_DINODE_FMT_BTREE) |
2451337d | 617 | return -EINVAL; |
68988114 DC |
618 | |
619 | if (xfs_get_extsz_hint(ip) || | |
620 | ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){ | |
621 | prealloced = 1; | |
622 | fixlen = mp->m_super->s_maxbytes; | |
623 | } else { | |
624 | prealloced = 0; | |
625 | fixlen = XFS_ISIZE(ip); | |
626 | } | |
f86f4037 | 627 | break; |
68988114 DC |
628 | } |
629 | ||
630 | if (bmv->bmv_length == -1) { | |
631 | fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen)); | |
632 | bmv->bmv_length = | |
c8ce540d | 633 | max_t(int64_t, fixlen - bmv->bmv_offset, 0); |
68988114 DC |
634 | } else if (bmv->bmv_length == 0) { |
635 | bmv->bmv_entries = 0; | |
636 | return 0; | |
637 | } else if (bmv->bmv_length < 0) { | |
2451337d | 638 | return -EINVAL; |
68988114 DC |
639 | } |
640 | ||
641 | nex = bmv->bmv_count - 1; | |
642 | if (nex <= 0) | |
2451337d | 643 | return -EINVAL; |
68988114 DC |
644 | bmvend = bmv->bmv_offset + bmv->bmv_length; |
645 | ||
646 | ||
647 | if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx)) | |
2451337d | 648 | return -ENOMEM; |
fdd3ccee DC |
649 | out = kmem_zalloc_large(bmv->bmv_count * sizeof(struct getbmapx), 0); |
650 | if (!out) | |
2451337d | 651 | return -ENOMEM; |
68988114 DC |
652 | |
653 | xfs_ilock(ip, XFS_IOLOCK_SHARED); | |
f86f4037 DW |
654 | switch (whichfork) { |
655 | case XFS_DATA_FORK: | |
efa70be1 CH |
656 | if (!(iflags & BMV_IF_DELALLOC) && |
657 | (ip->i_delayed_blks || XFS_ISIZE(ip) > ip->i_d.di_size)) { | |
2451337d | 658 | error = filemap_write_and_wait(VFS_I(ip)->i_mapping); |
68988114 DC |
659 | if (error) |
660 | goto out_unlock_iolock; | |
efa70be1 CH |
661 | |
662 | /* | |
663 | * Even after flushing the inode, there can still be | |
664 | * delalloc blocks on the inode beyond EOF due to | |
665 | * speculative preallocation. These are not removed | |
666 | * until the release function is called or the inode | |
667 | * is inactivated. Hence we cannot assert here that | |
668 | * ip->i_delayed_blks == 0. | |
669 | */ | |
68988114 | 670 | } |
68988114 | 671 | |
efa70be1 | 672 | lock = xfs_ilock_data_map_shared(ip); |
f86f4037 DW |
673 | break; |
674 | case XFS_COW_FORK: | |
675 | lock = XFS_ILOCK_SHARED; | |
676 | xfs_ilock(ip, lock); | |
677 | break; | |
678 | case XFS_ATTR_FORK: | |
efa70be1 | 679 | lock = xfs_ilock_attr_map_shared(ip); |
f86f4037 | 680 | break; |
efa70be1 | 681 | } |
68988114 DC |
682 | |
683 | /* | |
684 | * Don't let nex be bigger than the number of extents | |
685 | * we can have assuming alternating holes and real extents. | |
686 | */ | |
687 | if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1) | |
688 | nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1; | |
689 | ||
690 | bmapi_flags = xfs_bmapi_aflag(whichfork); | |
691 | if (!(iflags & BMV_IF_PREALLOC)) | |
692 | bmapi_flags |= XFS_BMAPI_IGSTATE; | |
693 | ||
694 | /* | |
695 | * Allocate enough space to handle "subnex" maps at a time. | |
696 | */ | |
2451337d | 697 | error = -ENOMEM; |
68988114 DC |
698 | subnex = 16; |
699 | map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS); | |
700 | if (!map) | |
701 | goto out_unlock_ilock; | |
702 | ||
703 | bmv->bmv_entries = 0; | |
704 | ||
705 | if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 && | |
706 | (whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) { | |
707 | error = 0; | |
708 | goto out_free_map; | |
709 | } | |
710 | ||
68988114 | 711 | do { |
c364b6d0 | 712 | nmap = (nex> subnex) ? subnex : nex; |
68988114 DC |
713 | error = xfs_bmapi_read(ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset), |
714 | XFS_BB_TO_FSB(mp, bmv->bmv_length), | |
715 | map, &nmap, bmapi_flags); | |
716 | if (error) | |
717 | goto out_free_map; | |
718 | ASSERT(nmap <= subnex); | |
719 | ||
c364b6d0 DW |
720 | for (i = 0; i < nmap && bmv->bmv_length && |
721 | cur_ext < bmv->bmv_count - 1; i++) { | |
68988114 DC |
722 | out[cur_ext].bmv_oflags = 0; |
723 | if (map[i].br_state == XFS_EXT_UNWRITTEN) | |
724 | out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC; | |
725 | else if (map[i].br_startblock == DELAYSTARTBLOCK) | |
726 | out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC; | |
727 | out[cur_ext].bmv_offset = | |
728 | XFS_FSB_TO_BB(mp, map[i].br_startoff); | |
729 | out[cur_ext].bmv_length = | |
730 | XFS_FSB_TO_BB(mp, map[i].br_blockcount); | |
731 | out[cur_ext].bmv_unused1 = 0; | |
732 | out[cur_ext].bmv_unused2 = 0; | |
733 | ||
734 | /* | |
735 | * delayed allocation extents that start beyond EOF can | |
736 | * occur due to speculative EOF allocation when the | |
737 | * delalloc extent is larger than the largest freespace | |
738 | * extent at conversion time. These extents cannot be | |
739 | * converted by data writeback, so can exist here even | |
740 | * if we are not supposed to be finding delalloc | |
741 | * extents. | |
742 | */ | |
743 | if (map[i].br_startblock == DELAYSTARTBLOCK && | |
892d2a5f | 744 | map[i].br_startoff < XFS_B_TO_FSB(mp, XFS_ISIZE(ip))) |
68988114 DC |
745 | ASSERT((iflags & BMV_IF_DELALLOC) != 0); |
746 | ||
747 | if (map[i].br_startblock == HOLESTARTBLOCK && | |
748 | whichfork == XFS_ATTR_FORK) { | |
749 | /* came to the end of attribute fork */ | |
750 | out[cur_ext].bmv_oflags |= BMV_OF_LAST; | |
751 | goto out_free_map; | |
752 | } | |
753 | ||
f86f4037 DW |
754 | /* Is this a shared block? */ |
755 | error = xfs_getbmap_adjust_shared(ip, whichfork, | |
756 | &map[i], &out[cur_ext], &inject_map); | |
757 | if (error) | |
758 | goto out_free_map; | |
759 | ||
760 | if (!xfs_getbmapx_fix_eof_hole(ip, whichfork, | |
761 | &out[cur_ext], prealloced, bmvend, | |
762 | map[i].br_startblock, | |
763 | inject_map.br_startblock != NULLFSBLOCK)) | |
68988114 DC |
764 | goto out_free_map; |
765 | ||
766 | bmv->bmv_offset = | |
767 | out[cur_ext].bmv_offset + | |
768 | out[cur_ext].bmv_length; | |
769 | bmv->bmv_length = | |
c8ce540d | 770 | max_t(int64_t, 0, bmvend - bmv->bmv_offset); |
68988114 DC |
771 | |
772 | /* | |
773 | * In case we don't want to return the hole, | |
774 | * don't increase cur_ext so that we can reuse | |
775 | * it in the next loop. | |
776 | */ | |
777 | if ((iflags & BMV_IF_NO_HOLES) && | |
778 | map[i].br_startblock == HOLESTARTBLOCK) { | |
779 | memset(&out[cur_ext], 0, sizeof(out[cur_ext])); | |
780 | continue; | |
781 | } | |
782 | ||
c364b6d0 DW |
783 | /* |
784 | * In order to report shared extents accurately, | |
785 | * we report each distinct shared/unshared part | |
786 | * of a single bmbt record using multiple bmap | |
787 | * extents. To make that happen, we iterate the | |
788 | * same map array item multiple times, each | |
789 | * time trimming out the subextent that we just | |
790 | * reported. | |
791 | * | |
792 | * Because of this, we must check the out array | |
793 | * index (cur_ext) directly against bmv_count-1 | |
794 | * to avoid overflows. | |
795 | */ | |
f86f4037 DW |
796 | if (inject_map.br_startblock != NULLFSBLOCK) { |
797 | map[i] = inject_map; | |
798 | i--; | |
c364b6d0 | 799 | } |
68988114 DC |
800 | bmv->bmv_entries++; |
801 | cur_ext++; | |
802 | } | |
c364b6d0 | 803 | } while (nmap && bmv->bmv_length && cur_ext < bmv->bmv_count - 1); |
68988114 DC |
804 | |
805 | out_free_map: | |
806 | kmem_free(map); | |
807 | out_unlock_ilock: | |
01f4f327 | 808 | xfs_iunlock(ip, lock); |
68988114 DC |
809 | out_unlock_iolock: |
810 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
811 | ||
812 | for (i = 0; i < cur_ext; i++) { | |
68988114 | 813 | /* format results & advance arg */ |
1dbba086 ES |
814 | error = formatter(&arg, &out[i]); |
815 | if (error) | |
68988114 DC |
816 | break; |
817 | } | |
818 | ||
fdd3ccee | 819 | kmem_free(out); |
68988114 DC |
820 | return error; |
821 | } | |
822 | ||
823 | /* | |
824 | * dead simple method of punching delalyed allocation blocks from a range in | |
825 | * the inode. Walks a block at a time so will be slow, but is only executed in | |
ad4809bf | 826 | * rare error cases so the overhead is not critical. This will always punch out |
68988114 DC |
827 | * both the start and end blocks, even if the ranges only partially overlap |
828 | * them, so it is up to the caller to ensure that partial blocks are not | |
829 | * passed in. | |
830 | */ | |
831 | int | |
832 | xfs_bmap_punch_delalloc_range( | |
833 | struct xfs_inode *ip, | |
834 | xfs_fileoff_t start_fsb, | |
835 | xfs_fileoff_t length) | |
836 | { | |
837 | xfs_fileoff_t remaining = length; | |
838 | int error = 0; | |
839 | ||
840 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); | |
841 | ||
842 | do { | |
843 | int done; | |
844 | xfs_bmbt_irec_t imap; | |
845 | int nimaps = 1; | |
846 | xfs_fsblock_t firstblock; | |
2c3234d1 | 847 | struct xfs_defer_ops dfops; |
68988114 DC |
848 | |
849 | /* | |
850 | * Map the range first and check that it is a delalloc extent | |
851 | * before trying to unmap the range. Otherwise we will be | |
852 | * trying to remove a real extent (which requires a | |
853 | * transaction) or a hole, which is probably a bad idea... | |
854 | */ | |
855 | error = xfs_bmapi_read(ip, start_fsb, 1, &imap, &nimaps, | |
856 | XFS_BMAPI_ENTIRE); | |
857 | ||
858 | if (error) { | |
859 | /* something screwed, just bail */ | |
860 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { | |
861 | xfs_alert(ip->i_mount, | |
862 | "Failed delalloc mapping lookup ino %lld fsb %lld.", | |
863 | ip->i_ino, start_fsb); | |
864 | } | |
865 | break; | |
866 | } | |
867 | if (!nimaps) { | |
868 | /* nothing there */ | |
869 | goto next_block; | |
870 | } | |
871 | if (imap.br_startblock != DELAYSTARTBLOCK) { | |
872 | /* been converted, ignore */ | |
873 | goto next_block; | |
874 | } | |
875 | WARN_ON(imap.br_blockcount == 0); | |
876 | ||
877 | /* | |
2c3234d1 | 878 | * Note: while we initialise the firstblock/dfops pair, they |
68988114 DC |
879 | * should never be used because blocks should never be |
880 | * allocated or freed for a delalloc extent and hence we need | |
881 | * don't cancel or finish them after the xfs_bunmapi() call. | |
882 | */ | |
2c3234d1 | 883 | xfs_defer_init(&dfops, &firstblock); |
68988114 | 884 | error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock, |
2c3234d1 | 885 | &dfops, &done); |
68988114 DC |
886 | if (error) |
887 | break; | |
888 | ||
2c3234d1 | 889 | ASSERT(!xfs_defer_has_unfinished_work(&dfops)); |
68988114 DC |
890 | next_block: |
891 | start_fsb++; | |
892 | remaining--; | |
893 | } while(remaining > 0); | |
894 | ||
895 | return error; | |
896 | } | |
c24b5dfa DC |
897 | |
898 | /* | |
899 | * Test whether it is appropriate to check an inode for and free post EOF | |
900 | * blocks. The 'force' parameter determines whether we should also consider | |
901 | * regular files that are marked preallocated or append-only. | |
902 | */ | |
903 | bool | |
904 | xfs_can_free_eofblocks(struct xfs_inode *ip, bool force) | |
905 | { | |
906 | /* prealloc/delalloc exists only on regular files */ | |
c19b3b05 | 907 | if (!S_ISREG(VFS_I(ip)->i_mode)) |
c24b5dfa DC |
908 | return false; |
909 | ||
910 | /* | |
911 | * Zero sized files with no cached pages and delalloc blocks will not | |
912 | * have speculative prealloc/delalloc blocks to remove. | |
913 | */ | |
914 | if (VFS_I(ip)->i_size == 0 && | |
2667c6f9 | 915 | VFS_I(ip)->i_mapping->nrpages == 0 && |
c24b5dfa DC |
916 | ip->i_delayed_blks == 0) |
917 | return false; | |
918 | ||
919 | /* If we haven't read in the extent list, then don't do it now. */ | |
920 | if (!(ip->i_df.if_flags & XFS_IFEXTENTS)) | |
921 | return false; | |
922 | ||
923 | /* | |
924 | * Do not free real preallocated or append-only files unless the file | |
925 | * has delalloc blocks and we are forced to remove them. | |
926 | */ | |
927 | if (ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) | |
928 | if (!force || ip->i_delayed_blks == 0) | |
929 | return false; | |
930 | ||
931 | return true; | |
932 | } | |
933 | ||
934 | /* | |
3b4683c2 BF |
935 | * This is called to free any blocks beyond eof. The caller must hold |
936 | * IOLOCK_EXCL unless we are in the inode reclaim path and have the only | |
937 | * reference to the inode. | |
c24b5dfa DC |
938 | */ |
939 | int | |
940 | xfs_free_eofblocks( | |
a36b9261 | 941 | struct xfs_inode *ip) |
c24b5dfa | 942 | { |
a36b9261 BF |
943 | struct xfs_trans *tp; |
944 | int error; | |
945 | xfs_fileoff_t end_fsb; | |
946 | xfs_fileoff_t last_fsb; | |
947 | xfs_filblks_t map_len; | |
948 | int nimaps; | |
949 | struct xfs_bmbt_irec imap; | |
950 | struct xfs_mount *mp = ip->i_mount; | |
951 | ||
c24b5dfa DC |
952 | /* |
953 | * Figure out if there are any blocks beyond the end | |
954 | * of the file. If not, then there is nothing to do. | |
955 | */ | |
956 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip)); | |
957 | last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); | |
958 | if (last_fsb <= end_fsb) | |
959 | return 0; | |
960 | map_len = last_fsb - end_fsb; | |
961 | ||
962 | nimaps = 1; | |
963 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
964 | error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0); | |
965 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
966 | ||
a36b9261 BF |
967 | /* |
968 | * If there are blocks after the end of file, truncate the file to its | |
969 | * current size to free them up. | |
970 | */ | |
c24b5dfa DC |
971 | if (!error && (nimaps != 0) && |
972 | (imap.br_startblock != HOLESTARTBLOCK || | |
973 | ip->i_delayed_blks)) { | |
974 | /* | |
975 | * Attach the dquots to the inode up front. | |
976 | */ | |
977 | error = xfs_qm_dqattach(ip, 0); | |
978 | if (error) | |
979 | return error; | |
980 | ||
e4229d6b BF |
981 | /* wait on dio to ensure i_size has settled */ |
982 | inode_dio_wait(VFS_I(ip)); | |
983 | ||
253f4911 CH |
984 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, |
985 | &tp); | |
c24b5dfa DC |
986 | if (error) { |
987 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
c24b5dfa DC |
988 | return error; |
989 | } | |
990 | ||
991 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
992 | xfs_trans_ijoin(tp, ip, 0); | |
993 | ||
994 | /* | |
995 | * Do not update the on-disk file size. If we update the | |
996 | * on-disk file size and then the system crashes before the | |
997 | * contents of the file are flushed to disk then the files | |
998 | * may be full of holes (ie NULL files bug). | |
999 | */ | |
1000 | error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, | |
1001 | XFS_ISIZE(ip)); | |
1002 | if (error) { | |
1003 | /* | |
1004 | * If we get an error at this point we simply don't | |
1005 | * bother truncating the file. | |
1006 | */ | |
4906e215 | 1007 | xfs_trans_cancel(tp); |
c24b5dfa | 1008 | } else { |
70393313 | 1009 | error = xfs_trans_commit(tp); |
c24b5dfa DC |
1010 | if (!error) |
1011 | xfs_inode_clear_eofblocks_tag(ip); | |
1012 | } | |
1013 | ||
1014 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
c24b5dfa DC |
1015 | } |
1016 | return error; | |
1017 | } | |
1018 | ||
83aee9e4 | 1019 | int |
c24b5dfa | 1020 | xfs_alloc_file_space( |
83aee9e4 | 1021 | struct xfs_inode *ip, |
c24b5dfa DC |
1022 | xfs_off_t offset, |
1023 | xfs_off_t len, | |
5f8aca8b | 1024 | int alloc_type) |
c24b5dfa DC |
1025 | { |
1026 | xfs_mount_t *mp = ip->i_mount; | |
1027 | xfs_off_t count; | |
1028 | xfs_filblks_t allocated_fsb; | |
1029 | xfs_filblks_t allocatesize_fsb; | |
1030 | xfs_extlen_t extsz, temp; | |
1031 | xfs_fileoff_t startoffset_fsb; | |
1032 | xfs_fsblock_t firstfsb; | |
1033 | int nimaps; | |
1034 | int quota_flag; | |
1035 | int rt; | |
1036 | xfs_trans_t *tp; | |
1037 | xfs_bmbt_irec_t imaps[1], *imapp; | |
2c3234d1 | 1038 | struct xfs_defer_ops dfops; |
c24b5dfa | 1039 | uint qblocks, resblks, resrtextents; |
c24b5dfa DC |
1040 | int error; |
1041 | ||
1042 | trace_xfs_alloc_file_space(ip); | |
1043 | ||
1044 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2451337d | 1045 | return -EIO; |
c24b5dfa DC |
1046 | |
1047 | error = xfs_qm_dqattach(ip, 0); | |
1048 | if (error) | |
1049 | return error; | |
1050 | ||
1051 | if (len <= 0) | |
2451337d | 1052 | return -EINVAL; |
c24b5dfa DC |
1053 | |
1054 | rt = XFS_IS_REALTIME_INODE(ip); | |
1055 | extsz = xfs_get_extsz_hint(ip); | |
1056 | ||
1057 | count = len; | |
1058 | imapp = &imaps[0]; | |
1059 | nimaps = 1; | |
1060 | startoffset_fsb = XFS_B_TO_FSBT(mp, offset); | |
1061 | allocatesize_fsb = XFS_B_TO_FSB(mp, count); | |
1062 | ||
1063 | /* | |
1064 | * Allocate file space until done or until there is an error | |
1065 | */ | |
1066 | while (allocatesize_fsb && !error) { | |
1067 | xfs_fileoff_t s, e; | |
1068 | ||
1069 | /* | |
1070 | * Determine space reservations for data/realtime. | |
1071 | */ | |
1072 | if (unlikely(extsz)) { | |
1073 | s = startoffset_fsb; | |
1074 | do_div(s, extsz); | |
1075 | s *= extsz; | |
1076 | e = startoffset_fsb + allocatesize_fsb; | |
1077 | if ((temp = do_mod(startoffset_fsb, extsz))) | |
1078 | e += temp; | |
1079 | if ((temp = do_mod(e, extsz))) | |
1080 | e += extsz - temp; | |
1081 | } else { | |
1082 | s = 0; | |
1083 | e = allocatesize_fsb; | |
1084 | } | |
1085 | ||
1086 | /* | |
1087 | * The transaction reservation is limited to a 32-bit block | |
1088 | * count, hence we need to limit the number of blocks we are | |
1089 | * trying to reserve to avoid an overflow. We can't allocate | |
1090 | * more than @nimaps extents, and an extent is limited on disk | |
1091 | * to MAXEXTLEN (21 bits), so use that to enforce the limit. | |
1092 | */ | |
1093 | resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps)); | |
1094 | if (unlikely(rt)) { | |
1095 | resrtextents = qblocks = resblks; | |
1096 | resrtextents /= mp->m_sb.sb_rextsize; | |
1097 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); | |
1098 | quota_flag = XFS_QMOPT_RES_RTBLKS; | |
1099 | } else { | |
1100 | resrtextents = 0; | |
1101 | resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks); | |
1102 | quota_flag = XFS_QMOPT_RES_REGBLKS; | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * Allocate and setup the transaction. | |
1107 | */ | |
253f4911 CH |
1108 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, |
1109 | resrtextents, 0, &tp); | |
1110 | ||
c24b5dfa DC |
1111 | /* |
1112 | * Check for running out of space | |
1113 | */ | |
1114 | if (error) { | |
1115 | /* | |
1116 | * Free the transaction structure. | |
1117 | */ | |
2451337d | 1118 | ASSERT(error == -ENOSPC || XFS_FORCED_SHUTDOWN(mp)); |
c24b5dfa DC |
1119 | break; |
1120 | } | |
1121 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1122 | error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, | |
1123 | 0, quota_flag); | |
1124 | if (error) | |
1125 | goto error1; | |
1126 | ||
1127 | xfs_trans_ijoin(tp, ip, 0); | |
1128 | ||
2c3234d1 | 1129 | xfs_defer_init(&dfops, &firstfsb); |
c24b5dfa DC |
1130 | error = xfs_bmapi_write(tp, ip, startoffset_fsb, |
1131 | allocatesize_fsb, alloc_type, &firstfsb, | |
2c3234d1 | 1132 | resblks, imapp, &nimaps, &dfops); |
f6106efa | 1133 | if (error) |
c24b5dfa | 1134 | goto error0; |
c24b5dfa DC |
1135 | |
1136 | /* | |
1137 | * Complete the transaction | |
1138 | */ | |
2c3234d1 | 1139 | error = xfs_defer_finish(&tp, &dfops, NULL); |
f6106efa | 1140 | if (error) |
c24b5dfa | 1141 | goto error0; |
c24b5dfa | 1142 | |
70393313 | 1143 | error = xfs_trans_commit(tp); |
c24b5dfa | 1144 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
f6106efa | 1145 | if (error) |
c24b5dfa | 1146 | break; |
c24b5dfa DC |
1147 | |
1148 | allocated_fsb = imapp->br_blockcount; | |
1149 | ||
1150 | if (nimaps == 0) { | |
2451337d | 1151 | error = -ENOSPC; |
c24b5dfa DC |
1152 | break; |
1153 | } | |
1154 | ||
1155 | startoffset_fsb += allocated_fsb; | |
1156 | allocatesize_fsb -= allocated_fsb; | |
1157 | } | |
1158 | ||
1159 | return error; | |
1160 | ||
1161 | error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ | |
2c3234d1 | 1162 | xfs_defer_cancel(&dfops); |
c24b5dfa DC |
1163 | xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag); |
1164 | ||
1165 | error1: /* Just cancel transaction */ | |
4906e215 | 1166 | xfs_trans_cancel(tp); |
c24b5dfa DC |
1167 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1168 | return error; | |
1169 | } | |
1170 | ||
bdb0d04f CH |
1171 | static int |
1172 | xfs_unmap_extent( | |
1173 | struct xfs_inode *ip, | |
1174 | xfs_fileoff_t startoffset_fsb, | |
1175 | xfs_filblks_t len_fsb, | |
1176 | int *done) | |
c24b5dfa | 1177 | { |
bdb0d04f CH |
1178 | struct xfs_mount *mp = ip->i_mount; |
1179 | struct xfs_trans *tp; | |
2c3234d1 | 1180 | struct xfs_defer_ops dfops; |
bdb0d04f CH |
1181 | xfs_fsblock_t firstfsb; |
1182 | uint resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); | |
1183 | int error; | |
c24b5dfa | 1184 | |
bdb0d04f CH |
1185 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp); |
1186 | if (error) { | |
1187 | ASSERT(error == -ENOSPC || XFS_FORCED_SHUTDOWN(mp)); | |
1188 | return error; | |
1189 | } | |
c24b5dfa | 1190 | |
bdb0d04f CH |
1191 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1192 | error = xfs_trans_reserve_quota(tp, mp, ip->i_udquot, ip->i_gdquot, | |
1193 | ip->i_pdquot, resblks, 0, XFS_QMOPT_RES_REGBLKS); | |
1194 | if (error) | |
1195 | goto out_trans_cancel; | |
c24b5dfa | 1196 | |
bdb0d04f | 1197 | xfs_trans_ijoin(tp, ip, 0); |
4f317369 | 1198 | |
2c3234d1 | 1199 | xfs_defer_init(&dfops, &firstfsb); |
bdb0d04f | 1200 | error = xfs_bunmapi(tp, ip, startoffset_fsb, len_fsb, 0, 2, &firstfsb, |
2c3234d1 | 1201 | &dfops, done); |
bdb0d04f CH |
1202 | if (error) |
1203 | goto out_bmap_cancel; | |
4f317369 | 1204 | |
2c3234d1 | 1205 | error = xfs_defer_finish(&tp, &dfops, ip); |
bdb0d04f CH |
1206 | if (error) |
1207 | goto out_bmap_cancel; | |
4f317369 | 1208 | |
bdb0d04f CH |
1209 | error = xfs_trans_commit(tp); |
1210 | out_unlock: | |
1211 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1212 | return error; | |
4f69f578 | 1213 | |
bdb0d04f | 1214 | out_bmap_cancel: |
2c3234d1 | 1215 | xfs_defer_cancel(&dfops); |
bdb0d04f CH |
1216 | out_trans_cancel: |
1217 | xfs_trans_cancel(tp); | |
1218 | goto out_unlock; | |
1219 | } | |
4f69f578 | 1220 | |
bdb0d04f CH |
1221 | static int |
1222 | xfs_adjust_extent_unmap_boundaries( | |
1223 | struct xfs_inode *ip, | |
1224 | xfs_fileoff_t *startoffset_fsb, | |
1225 | xfs_fileoff_t *endoffset_fsb) | |
1226 | { | |
1227 | struct xfs_mount *mp = ip->i_mount; | |
1228 | struct xfs_bmbt_irec imap; | |
1229 | int nimap, error; | |
1230 | xfs_extlen_t mod = 0; | |
4f69f578 | 1231 | |
bdb0d04f CH |
1232 | nimap = 1; |
1233 | error = xfs_bmapi_read(ip, *startoffset_fsb, 1, &imap, &nimap, 0); | |
1234 | if (error) | |
1235 | return error; | |
83a0adc3 | 1236 | |
bdb0d04f | 1237 | if (nimap && imap.br_startblock != HOLESTARTBLOCK) { |
bdb0d04f | 1238 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); |
4f1adf33 | 1239 | mod = do_mod(imap.br_startblock, mp->m_sb.sb_rextsize); |
bdb0d04f CH |
1240 | if (mod) |
1241 | *startoffset_fsb += mp->m_sb.sb_rextsize - mod; | |
1242 | } | |
83a0adc3 | 1243 | |
bdb0d04f CH |
1244 | nimap = 1; |
1245 | error = xfs_bmapi_read(ip, *endoffset_fsb - 1, 1, &imap, &nimap, 0); | |
1246 | if (error) | |
1247 | return error; | |
1248 | ||
1249 | if (nimap && imap.br_startblock != HOLESTARTBLOCK) { | |
1250 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); | |
1251 | mod++; | |
1252 | if (mod && mod != mp->m_sb.sb_rextsize) | |
1253 | *endoffset_fsb -= mod; | |
c24b5dfa | 1254 | } |
bdb0d04f CH |
1255 | |
1256 | return 0; | |
1257 | } | |
1258 | ||
1259 | static int | |
1260 | xfs_flush_unmap_range( | |
1261 | struct xfs_inode *ip, | |
1262 | xfs_off_t offset, | |
1263 | xfs_off_t len) | |
1264 | { | |
1265 | struct xfs_mount *mp = ip->i_mount; | |
1266 | struct inode *inode = VFS_I(ip); | |
1267 | xfs_off_t rounding, start, end; | |
1268 | int error; | |
1269 | ||
1270 | /* wait for the completion of any pending DIOs */ | |
1271 | inode_dio_wait(inode); | |
1272 | ||
1273 | rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_SIZE); | |
1274 | start = round_down(offset, rounding); | |
1275 | end = round_up(offset + len, rounding) - 1; | |
1276 | ||
1277 | error = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
1278 | if (error) | |
1279 | return error; | |
1280 | truncate_pagecache_range(inode, start, end); | |
1281 | return 0; | |
c24b5dfa DC |
1282 | } |
1283 | ||
83aee9e4 | 1284 | int |
c24b5dfa | 1285 | xfs_free_file_space( |
83aee9e4 | 1286 | struct xfs_inode *ip, |
c24b5dfa | 1287 | xfs_off_t offset, |
5f8aca8b | 1288 | xfs_off_t len) |
c24b5dfa | 1289 | { |
bdb0d04f | 1290 | struct xfs_mount *mp = ip->i_mount; |
c24b5dfa | 1291 | xfs_fileoff_t startoffset_fsb; |
bdb0d04f | 1292 | xfs_fileoff_t endoffset_fsb; |
3c2bdc91 | 1293 | int done = 0, error; |
c24b5dfa DC |
1294 | |
1295 | trace_xfs_free_file_space(ip); | |
1296 | ||
1297 | error = xfs_qm_dqattach(ip, 0); | |
1298 | if (error) | |
1299 | return error; | |
1300 | ||
c24b5dfa | 1301 | if (len <= 0) /* if nothing being freed */ |
bdb0d04f | 1302 | return 0; |
c24b5dfa | 1303 | |
bdb0d04f | 1304 | error = xfs_flush_unmap_range(ip, offset, len); |
c24b5dfa | 1305 | if (error) |
bdb0d04f CH |
1306 | return error; |
1307 | ||
1308 | startoffset_fsb = XFS_B_TO_FSB(mp, offset); | |
1309 | endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len); | |
c24b5dfa DC |
1310 | |
1311 | /* | |
bdb0d04f CH |
1312 | * Need to zero the stuff we're not freeing, on disk. If it's a RT file |
1313 | * and we can't use unwritten extents then we actually need to ensure | |
1314 | * to zero the whole extent, otherwise we just need to take of block | |
1315 | * boundaries, and xfs_bunmapi will handle the rest. | |
c24b5dfa | 1316 | */ |
bdb0d04f CH |
1317 | if (XFS_IS_REALTIME_INODE(ip) && |
1318 | !xfs_sb_version_hasextflgbit(&mp->m_sb)) { | |
1319 | error = xfs_adjust_extent_unmap_boundaries(ip, &startoffset_fsb, | |
1320 | &endoffset_fsb); | |
c24b5dfa | 1321 | if (error) |
bdb0d04f | 1322 | return error; |
c24b5dfa DC |
1323 | } |
1324 | ||
3c2bdc91 CH |
1325 | if (endoffset_fsb > startoffset_fsb) { |
1326 | while (!done) { | |
1327 | error = xfs_unmap_extent(ip, startoffset_fsb, | |
1328 | endoffset_fsb - startoffset_fsb, &done); | |
1329 | if (error) | |
1330 | return error; | |
c24b5dfa | 1331 | } |
c24b5dfa DC |
1332 | } |
1333 | ||
3c2bdc91 CH |
1334 | /* |
1335 | * Now that we've unmap all full blocks we'll have to zero out any | |
1336 | * partial block at the beginning and/or end. xfs_zero_range is | |
3dd09d5a CO |
1337 | * smart enough to skip any holes, including those we just created, |
1338 | * but we must take care not to zero beyond EOF and enlarge i_size. | |
3c2bdc91 | 1339 | */ |
3dd09d5a CO |
1340 | |
1341 | if (offset >= XFS_ISIZE(ip)) | |
1342 | return 0; | |
1343 | ||
1344 | if (offset + len > XFS_ISIZE(ip)) | |
1345 | len = XFS_ISIZE(ip) - offset; | |
1346 | ||
3c2bdc91 | 1347 | return xfs_zero_range(ip, offset, len, NULL); |
c24b5dfa DC |
1348 | } |
1349 | ||
5d11fb4b BF |
1350 | /* |
1351 | * Preallocate and zero a range of a file. This mechanism has the allocation | |
1352 | * semantics of fallocate and in addition converts data in the range to zeroes. | |
1353 | */ | |
865e9446 | 1354 | int |
c24b5dfa DC |
1355 | xfs_zero_file_space( |
1356 | struct xfs_inode *ip, | |
1357 | xfs_off_t offset, | |
5f8aca8b | 1358 | xfs_off_t len) |
c24b5dfa DC |
1359 | { |
1360 | struct xfs_mount *mp = ip->i_mount; | |
5d11fb4b | 1361 | uint blksize; |
c24b5dfa DC |
1362 | int error; |
1363 | ||
897b73b6 DC |
1364 | trace_xfs_zero_file_space(ip); |
1365 | ||
5d11fb4b | 1366 | blksize = 1 << mp->m_sb.sb_blocklog; |
c24b5dfa DC |
1367 | |
1368 | /* | |
5d11fb4b BF |
1369 | * Punch a hole and prealloc the range. We use hole punch rather than |
1370 | * unwritten extent conversion for two reasons: | |
1371 | * | |
1372 | * 1.) Hole punch handles partial block zeroing for us. | |
1373 | * | |
1374 | * 2.) If prealloc returns ENOSPC, the file range is still zero-valued | |
1375 | * by virtue of the hole punch. | |
c24b5dfa | 1376 | */ |
5d11fb4b BF |
1377 | error = xfs_free_file_space(ip, offset, len); |
1378 | if (error) | |
1379 | goto out; | |
c24b5dfa | 1380 | |
5d11fb4b BF |
1381 | error = xfs_alloc_file_space(ip, round_down(offset, blksize), |
1382 | round_up(offset + len, blksize) - | |
1383 | round_down(offset, blksize), | |
1384 | XFS_BMAPI_PREALLOC); | |
5f8aca8b | 1385 | out: |
c24b5dfa DC |
1386 | return error; |
1387 | ||
1388 | } | |
1389 | ||
e1d8fb88 | 1390 | /* |
a904b1ca NJ |
1391 | * @next_fsb will keep track of the extent currently undergoing shift. |
1392 | * @stop_fsb will keep track of the extent at which we have to stop. | |
1393 | * If we are shifting left, we will start with block (offset + len) and | |
1394 | * shift each extent till last extent. | |
1395 | * If we are shifting right, we will start with last extent inside file space | |
1396 | * and continue until we reach the block corresponding to offset. | |
e1d8fb88 | 1397 | */ |
72c1a739 | 1398 | static int |
a904b1ca NJ |
1399 | xfs_shift_file_space( |
1400 | struct xfs_inode *ip, | |
1401 | xfs_off_t offset, | |
1402 | xfs_off_t len, | |
1403 | enum shift_direction direction) | |
e1d8fb88 NJ |
1404 | { |
1405 | int done = 0; | |
1406 | struct xfs_mount *mp = ip->i_mount; | |
1407 | struct xfs_trans *tp; | |
1408 | int error; | |
2c3234d1 | 1409 | struct xfs_defer_ops dfops; |
e1d8fb88 | 1410 | xfs_fsblock_t first_block; |
a904b1ca | 1411 | xfs_fileoff_t stop_fsb; |
2c845f5a | 1412 | xfs_fileoff_t next_fsb; |
e1d8fb88 | 1413 | xfs_fileoff_t shift_fsb; |
48af96ab | 1414 | uint resblks; |
e1d8fb88 | 1415 | |
a904b1ca | 1416 | ASSERT(direction == SHIFT_LEFT || direction == SHIFT_RIGHT); |
e1d8fb88 | 1417 | |
a904b1ca | 1418 | if (direction == SHIFT_LEFT) { |
48af96ab BF |
1419 | /* |
1420 | * Reserve blocks to cover potential extent merges after left | |
1421 | * shift operations. | |
1422 | */ | |
1423 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); | |
a904b1ca NJ |
1424 | next_fsb = XFS_B_TO_FSB(mp, offset + len); |
1425 | stop_fsb = XFS_B_TO_FSB(mp, VFS_I(ip)->i_size); | |
1426 | } else { | |
1427 | /* | |
1428 | * If right shift, delegate the work of initialization of | |
1429 | * next_fsb to xfs_bmap_shift_extent as it has ilock held. | |
1430 | */ | |
48af96ab | 1431 | resblks = 0; |
a904b1ca NJ |
1432 | next_fsb = NULLFSBLOCK; |
1433 | stop_fsb = XFS_B_TO_FSB(mp, offset); | |
1434 | } | |
e1d8fb88 | 1435 | |
e1d8fb88 NJ |
1436 | shift_fsb = XFS_B_TO_FSB(mp, len); |
1437 | ||
f71721d0 BF |
1438 | /* |
1439 | * Trim eofblocks to avoid shifting uninitialized post-eof preallocation | |
1440 | * into the accessible region of the file. | |
1441 | */ | |
41b9d726 | 1442 | if (xfs_can_free_eofblocks(ip, true)) { |
a36b9261 | 1443 | error = xfs_free_eofblocks(ip); |
41b9d726 BF |
1444 | if (error) |
1445 | return error; | |
1446 | } | |
1669a8ca | 1447 | |
f71721d0 BF |
1448 | /* |
1449 | * Writeback and invalidate cache for the remainder of the file as we're | |
a904b1ca | 1450 | * about to shift down every extent from offset to EOF. |
f71721d0 BF |
1451 | */ |
1452 | error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping, | |
a904b1ca | 1453 | offset, -1); |
f71721d0 BF |
1454 | if (error) |
1455 | return error; | |
1456 | error = invalidate_inode_pages2_range(VFS_I(ip)->i_mapping, | |
09cbfeaf | 1457 | offset >> PAGE_SHIFT, -1); |
e1d8fb88 NJ |
1458 | if (error) |
1459 | return error; | |
1460 | ||
a904b1ca NJ |
1461 | /* |
1462 | * The extent shiting code works on extent granularity. So, if | |
1463 | * stop_fsb is not the starting block of extent, we need to split | |
1464 | * the extent at stop_fsb. | |
1465 | */ | |
1466 | if (direction == SHIFT_RIGHT) { | |
1467 | error = xfs_bmap_split_extent(ip, stop_fsb); | |
1468 | if (error) | |
1469 | return error; | |
1470 | } | |
1471 | ||
e1d8fb88 | 1472 | while (!error && !done) { |
48af96ab BF |
1473 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, |
1474 | &tp); | |
253f4911 | 1475 | if (error) |
e1d8fb88 | 1476 | break; |
e1d8fb88 NJ |
1477 | |
1478 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1479 | error = xfs_trans_reserve_quota(tp, mp, ip->i_udquot, | |
48af96ab | 1480 | ip->i_gdquot, ip->i_pdquot, resblks, 0, |
e1d8fb88 NJ |
1481 | XFS_QMOPT_RES_REGBLKS); |
1482 | if (error) | |
d4a97a04 | 1483 | goto out_trans_cancel; |
e1d8fb88 | 1484 | |
a904b1ca | 1485 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); |
e1d8fb88 | 1486 | |
2c3234d1 | 1487 | xfs_defer_init(&dfops, &first_block); |
e1d8fb88 NJ |
1488 | |
1489 | /* | |
1490 | * We are using the write transaction in which max 2 bmbt | |
1491 | * updates are allowed | |
1492 | */ | |
a904b1ca | 1493 | error = xfs_bmap_shift_extents(tp, ip, &next_fsb, shift_fsb, |
2c3234d1 | 1494 | &done, stop_fsb, &first_block, &dfops, |
a904b1ca | 1495 | direction, XFS_BMAP_MAX_SHIFT_EXTENTS); |
e1d8fb88 | 1496 | if (error) |
d4a97a04 | 1497 | goto out_bmap_cancel; |
e1d8fb88 | 1498 | |
2c3234d1 | 1499 | error = xfs_defer_finish(&tp, &dfops, NULL); |
e1d8fb88 | 1500 | if (error) |
d4a97a04 | 1501 | goto out_bmap_cancel; |
e1d8fb88 | 1502 | |
70393313 | 1503 | error = xfs_trans_commit(tp); |
e1d8fb88 NJ |
1504 | } |
1505 | ||
1506 | return error; | |
1507 | ||
d4a97a04 | 1508 | out_bmap_cancel: |
2c3234d1 | 1509 | xfs_defer_cancel(&dfops); |
d4a97a04 | 1510 | out_trans_cancel: |
4906e215 | 1511 | xfs_trans_cancel(tp); |
e1d8fb88 NJ |
1512 | return error; |
1513 | } | |
1514 | ||
a904b1ca NJ |
1515 | /* |
1516 | * xfs_collapse_file_space() | |
1517 | * This routine frees disk space and shift extent for the given file. | |
1518 | * The first thing we do is to free data blocks in the specified range | |
1519 | * by calling xfs_free_file_space(). It would also sync dirty data | |
1520 | * and invalidate page cache over the region on which collapse range | |
1521 | * is working. And Shift extent records to the left to cover a hole. | |
1522 | * RETURNS: | |
1523 | * 0 on success | |
1524 | * errno on error | |
1525 | * | |
1526 | */ | |
1527 | int | |
1528 | xfs_collapse_file_space( | |
1529 | struct xfs_inode *ip, | |
1530 | xfs_off_t offset, | |
1531 | xfs_off_t len) | |
1532 | { | |
1533 | int error; | |
1534 | ||
1535 | ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); | |
1536 | trace_xfs_collapse_file_space(ip); | |
1537 | ||
1538 | error = xfs_free_file_space(ip, offset, len); | |
1539 | if (error) | |
1540 | return error; | |
1541 | ||
1542 | return xfs_shift_file_space(ip, offset, len, SHIFT_LEFT); | |
1543 | } | |
1544 | ||
1545 | /* | |
1546 | * xfs_insert_file_space() | |
1547 | * This routine create hole space by shifting extents for the given file. | |
1548 | * The first thing we do is to sync dirty data and invalidate page cache | |
1549 | * over the region on which insert range is working. And split an extent | |
1550 | * to two extents at given offset by calling xfs_bmap_split_extent. | |
1551 | * And shift all extent records which are laying between [offset, | |
1552 | * last allocated extent] to the right to reserve hole range. | |
1553 | * RETURNS: | |
1554 | * 0 on success | |
1555 | * errno on error | |
1556 | */ | |
1557 | int | |
1558 | xfs_insert_file_space( | |
1559 | struct xfs_inode *ip, | |
1560 | loff_t offset, | |
1561 | loff_t len) | |
1562 | { | |
1563 | ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); | |
1564 | trace_xfs_insert_file_space(ip); | |
1565 | ||
1566 | return xfs_shift_file_space(ip, offset, len, SHIFT_RIGHT); | |
1567 | } | |
1568 | ||
a133d952 DC |
1569 | /* |
1570 | * We need to check that the format of the data fork in the temporary inode is | |
1571 | * valid for the target inode before doing the swap. This is not a problem with | |
1572 | * attr1 because of the fixed fork offset, but attr2 has a dynamically sized | |
1573 | * data fork depending on the space the attribute fork is taking so we can get | |
1574 | * invalid formats on the target inode. | |
1575 | * | |
1576 | * E.g. target has space for 7 extents in extent format, temp inode only has | |
1577 | * space for 6. If we defragment down to 7 extents, then the tmp format is a | |
1578 | * btree, but when swapped it needs to be in extent format. Hence we can't just | |
1579 | * blindly swap data forks on attr2 filesystems. | |
1580 | * | |
1581 | * Note that we check the swap in both directions so that we don't end up with | |
1582 | * a corrupt temporary inode, either. | |
1583 | * | |
1584 | * Note that fixing the way xfs_fsr sets up the attribute fork in the source | |
1585 | * inode will prevent this situation from occurring, so all we do here is | |
1586 | * reject and log the attempt. basically we are putting the responsibility on | |
1587 | * userspace to get this right. | |
1588 | */ | |
1589 | static int | |
1590 | xfs_swap_extents_check_format( | |
e06259aa DW |
1591 | struct xfs_inode *ip, /* target inode */ |
1592 | struct xfs_inode *tip) /* tmp inode */ | |
a133d952 DC |
1593 | { |
1594 | ||
1595 | /* Should never get a local format */ | |
1596 | if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL || | |
1597 | tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) | |
2451337d | 1598 | return -EINVAL; |
a133d952 DC |
1599 | |
1600 | /* | |
1601 | * if the target inode has less extents that then temporary inode then | |
1602 | * why did userspace call us? | |
1603 | */ | |
1604 | if (ip->i_d.di_nextents < tip->i_d.di_nextents) | |
2451337d | 1605 | return -EINVAL; |
a133d952 | 1606 | |
1f08af52 DW |
1607 | /* |
1608 | * If we have to use the (expensive) rmap swap method, we can | |
1609 | * handle any number of extents and any format. | |
1610 | */ | |
1611 | if (xfs_sb_version_hasrmapbt(&ip->i_mount->m_sb)) | |
1612 | return 0; | |
1613 | ||
a133d952 DC |
1614 | /* |
1615 | * if the target inode is in extent form and the temp inode is in btree | |
1616 | * form then we will end up with the target inode in the wrong format | |
1617 | * as we already know there are less extents in the temp inode. | |
1618 | */ | |
1619 | if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS && | |
1620 | tip->i_d.di_format == XFS_DINODE_FMT_BTREE) | |
2451337d | 1621 | return -EINVAL; |
a133d952 DC |
1622 | |
1623 | /* Check temp in extent form to max in target */ | |
1624 | if (tip->i_d.di_format == XFS_DINODE_FMT_EXTENTS && | |
1625 | XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) > | |
1626 | XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)) | |
2451337d | 1627 | return -EINVAL; |
a133d952 DC |
1628 | |
1629 | /* Check target in extent form to max in temp */ | |
1630 | if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS && | |
1631 | XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) > | |
1632 | XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK)) | |
2451337d | 1633 | return -EINVAL; |
a133d952 DC |
1634 | |
1635 | /* | |
1636 | * If we are in a btree format, check that the temp root block will fit | |
1637 | * in the target and that it has enough extents to be in btree format | |
1638 | * in the target. | |
1639 | * | |
1640 | * Note that we have to be careful to allow btree->extent conversions | |
1641 | * (a common defrag case) which will occur when the temp inode is in | |
1642 | * extent format... | |
1643 | */ | |
1644 | if (tip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
0cbe48cc | 1645 | if (XFS_IFORK_Q(ip) && |
a133d952 | 1646 | XFS_BMAP_BMDR_SPACE(tip->i_df.if_broot) > XFS_IFORK_BOFF(ip)) |
2451337d | 1647 | return -EINVAL; |
a133d952 DC |
1648 | if (XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) <= |
1649 | XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)) | |
2451337d | 1650 | return -EINVAL; |
a133d952 DC |
1651 | } |
1652 | ||
1653 | /* Reciprocal target->temp btree format checks */ | |
1654 | if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
0cbe48cc | 1655 | if (XFS_IFORK_Q(tip) && |
a133d952 | 1656 | XFS_BMAP_BMDR_SPACE(ip->i_df.if_broot) > XFS_IFORK_BOFF(tip)) |
2451337d | 1657 | return -EINVAL; |
a133d952 DC |
1658 | if (XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) <= |
1659 | XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK)) | |
2451337d | 1660 | return -EINVAL; |
a133d952 DC |
1661 | } |
1662 | ||
1663 | return 0; | |
1664 | } | |
1665 | ||
7abbb8f9 | 1666 | static int |
4ef897a2 DC |
1667 | xfs_swap_extent_flush( |
1668 | struct xfs_inode *ip) | |
1669 | { | |
1670 | int error; | |
1671 | ||
1672 | error = filemap_write_and_wait(VFS_I(ip)->i_mapping); | |
1673 | if (error) | |
1674 | return error; | |
1675 | truncate_pagecache_range(VFS_I(ip), 0, -1); | |
1676 | ||
1677 | /* Verify O_DIRECT for ftmp */ | |
1678 | if (VFS_I(ip)->i_mapping->nrpages) | |
1679 | return -EINVAL; | |
4ef897a2 DC |
1680 | return 0; |
1681 | } | |
1682 | ||
1f08af52 DW |
1683 | /* |
1684 | * Move extents from one file to another, when rmap is enabled. | |
1685 | */ | |
1686 | STATIC int | |
1687 | xfs_swap_extent_rmap( | |
1688 | struct xfs_trans **tpp, | |
1689 | struct xfs_inode *ip, | |
1690 | struct xfs_inode *tip) | |
1691 | { | |
1692 | struct xfs_bmbt_irec irec; | |
1693 | struct xfs_bmbt_irec uirec; | |
1694 | struct xfs_bmbt_irec tirec; | |
1695 | xfs_fileoff_t offset_fsb; | |
1696 | xfs_fileoff_t end_fsb; | |
1697 | xfs_filblks_t count_fsb; | |
1698 | xfs_fsblock_t firstfsb; | |
1699 | struct xfs_defer_ops dfops; | |
1700 | int error; | |
1701 | xfs_filblks_t ilen; | |
1702 | xfs_filblks_t rlen; | |
1703 | int nimaps; | |
c8ce540d | 1704 | uint64_t tip_flags2; |
1f08af52 DW |
1705 | |
1706 | /* | |
1707 | * If the source file has shared blocks, we must flag the donor | |
1708 | * file as having shared blocks so that we get the shared-block | |
1709 | * rmap functions when we go to fix up the rmaps. The flags | |
1710 | * will be switch for reals later. | |
1711 | */ | |
1712 | tip_flags2 = tip->i_d.di_flags2; | |
1713 | if (ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK) | |
1714 | tip->i_d.di_flags2 |= XFS_DIFLAG2_REFLINK; | |
1715 | ||
1716 | offset_fsb = 0; | |
1717 | end_fsb = XFS_B_TO_FSB(ip->i_mount, i_size_read(VFS_I(ip))); | |
1718 | count_fsb = (xfs_filblks_t)(end_fsb - offset_fsb); | |
1719 | ||
1720 | while (count_fsb) { | |
1721 | /* Read extent from the donor file */ | |
1722 | nimaps = 1; | |
1723 | error = xfs_bmapi_read(tip, offset_fsb, count_fsb, &tirec, | |
1724 | &nimaps, 0); | |
1725 | if (error) | |
1726 | goto out; | |
1727 | ASSERT(nimaps == 1); | |
1728 | ASSERT(tirec.br_startblock != DELAYSTARTBLOCK); | |
1729 | ||
1730 | trace_xfs_swap_extent_rmap_remap(tip, &tirec); | |
1731 | ilen = tirec.br_blockcount; | |
1732 | ||
1733 | /* Unmap the old blocks in the source file. */ | |
1734 | while (tirec.br_blockcount) { | |
1735 | xfs_defer_init(&dfops, &firstfsb); | |
1736 | trace_xfs_swap_extent_rmap_remap_piece(tip, &tirec); | |
1737 | ||
1738 | /* Read extent from the source file */ | |
1739 | nimaps = 1; | |
1740 | error = xfs_bmapi_read(ip, tirec.br_startoff, | |
1741 | tirec.br_blockcount, &irec, | |
1742 | &nimaps, 0); | |
1743 | if (error) | |
1744 | goto out_defer; | |
1745 | ASSERT(nimaps == 1); | |
1746 | ASSERT(tirec.br_startoff == irec.br_startoff); | |
1747 | trace_xfs_swap_extent_rmap_remap_piece(ip, &irec); | |
1748 | ||
1749 | /* Trim the extent. */ | |
1750 | uirec = tirec; | |
1751 | uirec.br_blockcount = rlen = min_t(xfs_filblks_t, | |
1752 | tirec.br_blockcount, | |
1753 | irec.br_blockcount); | |
1754 | trace_xfs_swap_extent_rmap_remap_piece(tip, &uirec); | |
1755 | ||
1756 | /* Remove the mapping from the donor file. */ | |
1757 | error = xfs_bmap_unmap_extent((*tpp)->t_mountp, &dfops, | |
1758 | tip, &uirec); | |
1759 | if (error) | |
1760 | goto out_defer; | |
1761 | ||
1762 | /* Remove the mapping from the source file. */ | |
1763 | error = xfs_bmap_unmap_extent((*tpp)->t_mountp, &dfops, | |
1764 | ip, &irec); | |
1765 | if (error) | |
1766 | goto out_defer; | |
1767 | ||
1768 | /* Map the donor file's blocks into the source file. */ | |
1769 | error = xfs_bmap_map_extent((*tpp)->t_mountp, &dfops, | |
1770 | ip, &uirec); | |
1771 | if (error) | |
1772 | goto out_defer; | |
1773 | ||
1774 | /* Map the source file's blocks into the donor file. */ | |
1775 | error = xfs_bmap_map_extent((*tpp)->t_mountp, &dfops, | |
1776 | tip, &irec); | |
1777 | if (error) | |
1778 | goto out_defer; | |
1779 | ||
1780 | error = xfs_defer_finish(tpp, &dfops, ip); | |
1781 | if (error) | |
1782 | goto out_defer; | |
1783 | ||
1784 | tirec.br_startoff += rlen; | |
1785 | if (tirec.br_startblock != HOLESTARTBLOCK && | |
1786 | tirec.br_startblock != DELAYSTARTBLOCK) | |
1787 | tirec.br_startblock += rlen; | |
1788 | tirec.br_blockcount -= rlen; | |
1789 | } | |
1790 | ||
1791 | /* Roll on... */ | |
1792 | count_fsb -= ilen; | |
1793 | offset_fsb += ilen; | |
1794 | } | |
1795 | ||
1796 | tip->i_d.di_flags2 = tip_flags2; | |
1797 | return 0; | |
1798 | ||
1799 | out_defer: | |
1800 | xfs_defer_cancel(&dfops); | |
1801 | out: | |
1802 | trace_xfs_swap_extent_rmap_error(ip, error, _RET_IP_); | |
1803 | tip->i_d.di_flags2 = tip_flags2; | |
1804 | return error; | |
1805 | } | |
1806 | ||
39aff5fd DW |
1807 | /* Swap the extents of two files by swapping data forks. */ |
1808 | STATIC int | |
1809 | xfs_swap_extent_forks( | |
1810 | struct xfs_trans *tp, | |
1811 | struct xfs_inode *ip, | |
1812 | struct xfs_inode *tip, | |
1813 | int *src_log_flags, | |
1814 | int *target_log_flags) | |
a133d952 | 1815 | { |
39aff5fd | 1816 | struct xfs_ifork tempifp, *ifp, *tifp; |
e7f5d5ca DW |
1817 | xfs_filblks_t aforkblks = 0; |
1818 | xfs_filblks_t taforkblks = 0; | |
1819 | xfs_extnum_t junk; | |
4dfce57d | 1820 | xfs_extnum_t nextents; |
c8ce540d | 1821 | uint64_t tmp; |
39aff5fd | 1822 | int error; |
a133d952 | 1823 | |
a133d952 DC |
1824 | /* |
1825 | * Count the number of extended attribute blocks | |
1826 | */ | |
1827 | if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) && | |
1828 | (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
e7f5d5ca | 1829 | error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &junk, |
39aff5fd | 1830 | &aforkblks); |
a133d952 | 1831 | if (error) |
39aff5fd | 1832 | return error; |
a133d952 DC |
1833 | } |
1834 | if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) && | |
1835 | (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { | |
e7f5d5ca | 1836 | error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK, &junk, |
39aff5fd | 1837 | &taforkblks); |
a133d952 | 1838 | if (error) |
39aff5fd | 1839 | return error; |
a133d952 DC |
1840 | } |
1841 | ||
21b5c978 DC |
1842 | /* |
1843 | * Before we've swapped the forks, lets set the owners of the forks | |
1844 | * appropriately. We have to do this as we are demand paging the btree | |
1845 | * buffers, and so the validation done on read will expect the owner | |
1846 | * field to be correctly set. Once we change the owners, we can swap the | |
1847 | * inode forks. | |
21b5c978 | 1848 | */ |
21b5c978 DC |
1849 | if (ip->i_d.di_version == 3 && |
1850 | ip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
39aff5fd | 1851 | (*target_log_flags) |= XFS_ILOG_DOWNER; |
638f4416 DC |
1852 | error = xfs_bmbt_change_owner(tp, ip, XFS_DATA_FORK, |
1853 | tip->i_ino, NULL); | |
21b5c978 | 1854 | if (error) |
39aff5fd | 1855 | return error; |
21b5c978 DC |
1856 | } |
1857 | ||
1858 | if (tip->i_d.di_version == 3 && | |
1859 | tip->i_d.di_format == XFS_DINODE_FMT_BTREE) { | |
39aff5fd | 1860 | (*src_log_flags) |= XFS_ILOG_DOWNER; |
638f4416 DC |
1861 | error = xfs_bmbt_change_owner(tp, tip, XFS_DATA_FORK, |
1862 | ip->i_ino, NULL); | |
21b5c978 | 1863 | if (error) |
39aff5fd | 1864 | return error; |
21b5c978 DC |
1865 | } |
1866 | ||
a133d952 DC |
1867 | /* |
1868 | * Swap the data forks of the inodes | |
1869 | */ | |
1870 | ifp = &ip->i_df; | |
1871 | tifp = &tip->i_df; | |
39aff5fd | 1872 | tempifp = *ifp; /* struct copy */ |
a133d952 | 1873 | *ifp = *tifp; /* struct copy */ |
39aff5fd | 1874 | *tifp = tempifp; /* struct copy */ |
a133d952 DC |
1875 | |
1876 | /* | |
1877 | * Fix the on-disk inode values | |
1878 | */ | |
c8ce540d | 1879 | tmp = (uint64_t)ip->i_d.di_nblocks; |
a133d952 DC |
1880 | ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks; |
1881 | tip->i_d.di_nblocks = tmp + taforkblks - aforkblks; | |
1882 | ||
c8ce540d | 1883 | tmp = (uint64_t) ip->i_d.di_nextents; |
a133d952 DC |
1884 | ip->i_d.di_nextents = tip->i_d.di_nextents; |
1885 | tip->i_d.di_nextents = tmp; | |
1886 | ||
c8ce540d | 1887 | tmp = (uint64_t) ip->i_d.di_format; |
a133d952 DC |
1888 | ip->i_d.di_format = tip->i_d.di_format; |
1889 | tip->i_d.di_format = tmp; | |
1890 | ||
1891 | /* | |
1892 | * The extents in the source inode could still contain speculative | |
1893 | * preallocation beyond EOF (e.g. the file is open but not modified | |
1894 | * while defrag is in progress). In that case, we need to copy over the | |
1895 | * number of delalloc blocks the data fork in the source inode is | |
1896 | * tracking beyond EOF so that when the fork is truncated away when the | |
1897 | * temporary inode is unlinked we don't underrun the i_delayed_blks | |
1898 | * counter on that inode. | |
1899 | */ | |
1900 | ASSERT(tip->i_delayed_blks == 0); | |
1901 | tip->i_delayed_blks = ip->i_delayed_blks; | |
1902 | ip->i_delayed_blks = 0; | |
1903 | ||
a133d952 DC |
1904 | switch (ip->i_d.di_format) { |
1905 | case XFS_DINODE_FMT_EXTENTS: | |
5d829300 ES |
1906 | /* |
1907 | * If the extents fit in the inode, fix the pointer. Otherwise | |
1908 | * it's already NULL or pointing to the extent. | |
a133d952 | 1909 | */ |
5d829300 ES |
1910 | nextents = xfs_iext_count(&ip->i_df); |
1911 | if (nextents <= XFS_INLINE_EXTS) | |
1912 | ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext; | |
39aff5fd | 1913 | (*src_log_flags) |= XFS_ILOG_DEXT; |
a133d952 DC |
1914 | break; |
1915 | case XFS_DINODE_FMT_BTREE: | |
21b5c978 | 1916 | ASSERT(ip->i_d.di_version < 3 || |
39aff5fd DW |
1917 | (*src_log_flags & XFS_ILOG_DOWNER)); |
1918 | (*src_log_flags) |= XFS_ILOG_DBROOT; | |
a133d952 DC |
1919 | break; |
1920 | } | |
1921 | ||
a133d952 DC |
1922 | switch (tip->i_d.di_format) { |
1923 | case XFS_DINODE_FMT_EXTENTS: | |
5d829300 ES |
1924 | /* |
1925 | * If the extents fit in the inode, fix the pointer. Otherwise | |
1926 | * it's already NULL or pointing to the extent. | |
a133d952 | 1927 | */ |
5d829300 ES |
1928 | nextents = xfs_iext_count(&tip->i_df); |
1929 | if (nextents <= XFS_INLINE_EXTS) | |
1930 | tifp->if_u1.if_extents = tifp->if_u2.if_inline_ext; | |
39aff5fd | 1931 | (*target_log_flags) |= XFS_ILOG_DEXT; |
a133d952 DC |
1932 | break; |
1933 | case XFS_DINODE_FMT_BTREE: | |
39aff5fd | 1934 | (*target_log_flags) |= XFS_ILOG_DBROOT; |
21b5c978 | 1935 | ASSERT(tip->i_d.di_version < 3 || |
39aff5fd | 1936 | (*target_log_flags & XFS_ILOG_DOWNER)); |
a133d952 DC |
1937 | break; |
1938 | } | |
1939 | ||
39aff5fd DW |
1940 | return 0; |
1941 | } | |
1942 | ||
1943 | int | |
1944 | xfs_swap_extents( | |
1945 | struct xfs_inode *ip, /* target inode */ | |
1946 | struct xfs_inode *tip, /* tmp inode */ | |
1947 | struct xfs_swapext *sxp) | |
1948 | { | |
1949 | struct xfs_mount *mp = ip->i_mount; | |
1950 | struct xfs_trans *tp; | |
1951 | struct xfs_bstat *sbp = &sxp->sx_stat; | |
1952 | int src_log_flags, target_log_flags; | |
1953 | int error = 0; | |
1954 | int lock_flags; | |
1955 | struct xfs_ifork *cowfp; | |
c8ce540d | 1956 | uint64_t f; |
1f08af52 | 1957 | int resblks; |
39aff5fd DW |
1958 | |
1959 | /* | |
1960 | * Lock the inodes against other IO, page faults and truncate to | |
1961 | * begin with. Then we can ensure the inodes are flushed and have no | |
1962 | * page cache safely. Once we have done this we can take the ilocks and | |
1963 | * do the rest of the checks. | |
1964 | */ | |
65523218 CH |
1965 | lock_two_nondirectories(VFS_I(ip), VFS_I(tip)); |
1966 | lock_flags = XFS_MMAPLOCK_EXCL; | |
39aff5fd DW |
1967 | xfs_lock_two_inodes(ip, tip, XFS_MMAPLOCK_EXCL); |
1968 | ||
1969 | /* Verify that both files have the same format */ | |
1970 | if ((VFS_I(ip)->i_mode & S_IFMT) != (VFS_I(tip)->i_mode & S_IFMT)) { | |
1971 | error = -EINVAL; | |
1972 | goto out_unlock; | |
1973 | } | |
1974 | ||
1975 | /* Verify both files are either real-time or non-realtime */ | |
1976 | if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) { | |
1977 | error = -EINVAL; | |
1978 | goto out_unlock; | |
1979 | } | |
1980 | ||
1981 | error = xfs_swap_extent_flush(ip); | |
1982 | if (error) | |
1983 | goto out_unlock; | |
1984 | error = xfs_swap_extent_flush(tip); | |
1985 | if (error) | |
1986 | goto out_unlock; | |
1987 | ||
1f08af52 DW |
1988 | /* |
1989 | * Extent "swapping" with rmap requires a permanent reservation and | |
1990 | * a block reservation because it's really just a remap operation | |
1991 | * performed with log redo items! | |
1992 | */ | |
1993 | if (xfs_sb_version_hasrmapbt(&mp->m_sb)) { | |
1994 | /* | |
1995 | * Conceptually this shouldn't affect the shape of either | |
1996 | * bmbt, but since we atomically move extents one by one, | |
1997 | * we reserve enough space to rebuild both trees. | |
1998 | */ | |
1999 | resblks = XFS_SWAP_RMAP_SPACE_RES(mp, | |
2000 | XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK), | |
2001 | XFS_DATA_FORK) + | |
2002 | XFS_SWAP_RMAP_SPACE_RES(mp, | |
2003 | XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK), | |
2004 | XFS_DATA_FORK); | |
2005 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, | |
2006 | 0, 0, &tp); | |
2007 | } else | |
2008 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, | |
2009 | 0, 0, &tp); | |
39aff5fd DW |
2010 | if (error) |
2011 | goto out_unlock; | |
2012 | ||
2013 | /* | |
2014 | * Lock and join the inodes to the tansaction so that transaction commit | |
2015 | * or cancel will unlock the inodes from this point onwards. | |
2016 | */ | |
2017 | xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL); | |
2018 | lock_flags |= XFS_ILOCK_EXCL; | |
2019 | xfs_trans_ijoin(tp, ip, 0); | |
2020 | xfs_trans_ijoin(tp, tip, 0); | |
2021 | ||
2022 | ||
2023 | /* Verify all data are being swapped */ | |
2024 | if (sxp->sx_offset != 0 || | |
2025 | sxp->sx_length != ip->i_d.di_size || | |
2026 | sxp->sx_length != tip->i_d.di_size) { | |
2027 | error = -EFAULT; | |
2028 | goto out_trans_cancel; | |
2029 | } | |
2030 | ||
2031 | trace_xfs_swap_extent_before(ip, 0); | |
2032 | trace_xfs_swap_extent_before(tip, 1); | |
2033 | ||
2034 | /* check inode formats now that data is flushed */ | |
2035 | error = xfs_swap_extents_check_format(ip, tip); | |
2036 | if (error) { | |
2037 | xfs_notice(mp, | |
2038 | "%s: inode 0x%llx format is incompatible for exchanging.", | |
2039 | __func__, ip->i_ino); | |
2040 | goto out_trans_cancel; | |
2041 | } | |
2042 | ||
2043 | /* | |
2044 | * Compare the current change & modify times with that | |
2045 | * passed in. If they differ, we abort this swap. | |
2046 | * This is the mechanism used to ensure the calling | |
2047 | * process that the file was not changed out from | |
2048 | * under it. | |
2049 | */ | |
2050 | if ((sbp->bs_ctime.tv_sec != VFS_I(ip)->i_ctime.tv_sec) || | |
2051 | (sbp->bs_ctime.tv_nsec != VFS_I(ip)->i_ctime.tv_nsec) || | |
2052 | (sbp->bs_mtime.tv_sec != VFS_I(ip)->i_mtime.tv_sec) || | |
2053 | (sbp->bs_mtime.tv_nsec != VFS_I(ip)->i_mtime.tv_nsec)) { | |
2054 | error = -EBUSY; | |
2055 | goto out_trans_cancel; | |
2056 | } | |
2057 | ||
2058 | /* | |
2059 | * Note the trickiness in setting the log flags - we set the owner log | |
2060 | * flag on the opposite inode (i.e. the inode we are setting the new | |
2061 | * owner to be) because once we swap the forks and log that, log | |
2062 | * recovery is going to see the fork as owned by the swapped inode, | |
2063 | * not the pre-swapped inodes. | |
2064 | */ | |
2065 | src_log_flags = XFS_ILOG_CORE; | |
2066 | target_log_flags = XFS_ILOG_CORE; | |
2067 | ||
1f08af52 DW |
2068 | if (xfs_sb_version_hasrmapbt(&mp->m_sb)) |
2069 | error = xfs_swap_extent_rmap(&tp, ip, tip); | |
2070 | else | |
2071 | error = xfs_swap_extent_forks(tp, ip, tip, &src_log_flags, | |
2072 | &target_log_flags); | |
39aff5fd DW |
2073 | if (error) |
2074 | goto out_trans_cancel; | |
2075 | ||
f0bc4d13 DW |
2076 | /* Do we have to swap reflink flags? */ |
2077 | if ((ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK) ^ | |
2078 | (tip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK)) { | |
2079 | f = ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK; | |
2080 | ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; | |
2081 | ip->i_d.di_flags2 |= tip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK; | |
2082 | tip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; | |
2083 | tip->i_d.di_flags2 |= f & XFS_DIFLAG2_REFLINK; | |
2084 | cowfp = ip->i_cowfp; | |
2085 | ip->i_cowfp = tip->i_cowfp; | |
2086 | tip->i_cowfp = cowfp; | |
83104d44 DW |
2087 | xfs_inode_set_cowblocks_tag(ip); |
2088 | xfs_inode_set_cowblocks_tag(tip); | |
f0bc4d13 DW |
2089 | } |
2090 | ||
a133d952 DC |
2091 | xfs_trans_log_inode(tp, ip, src_log_flags); |
2092 | xfs_trans_log_inode(tp, tip, target_log_flags); | |
2093 | ||
2094 | /* | |
2095 | * If this is a synchronous mount, make sure that the | |
2096 | * transaction goes to disk before returning to the user. | |
2097 | */ | |
2098 | if (mp->m_flags & XFS_MOUNT_WSYNC) | |
2099 | xfs_trans_set_sync(tp); | |
2100 | ||
70393313 | 2101 | error = xfs_trans_commit(tp); |
a133d952 DC |
2102 | |
2103 | trace_xfs_swap_extent_after(ip, 0); | |
2104 | trace_xfs_swap_extent_after(tip, 1); | |
a133d952 | 2105 | |
65523218 | 2106 | out_unlock: |
81217683 DC |
2107 | xfs_iunlock(ip, lock_flags); |
2108 | xfs_iunlock(tip, lock_flags); | |
65523218 | 2109 | unlock_two_nondirectories(VFS_I(ip), VFS_I(tip)); |
39aff5fd | 2110 | return error; |
a133d952 DC |
2111 | |
2112 | out_trans_cancel: | |
4906e215 | 2113 | xfs_trans_cancel(tp); |
65523218 | 2114 | goto out_unlock; |
a133d952 | 2115 | } |