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HAMMER 60E/Many: Mirroring, bug fixes
[dragonfly.git] / sys / vfs / hammer / hammer_vnops.c
blob00183a58f14e16b9c555ed1c0897f60897964769
1 /*
2 * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $DragonFly: src/sys/vfs/hammer/hammer_vnops.c,v 1.81 2008/07/07 00:24:31 dillon Exp $
35 */
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/fcntl.h>
41 #include <sys/namecache.h>
42 #include <sys/vnode.h>
43 #include <sys/lockf.h>
44 #include <sys/event.h>
45 #include <sys/stat.h>
46 #include <sys/dirent.h>
47 #include <vm/vm_extern.h>
48 #include <vfs/fifofs/fifo.h>
49 #include "hammer.h"
50
51 /*
52 * USERFS VNOPS
53 */
54 /*static int hammer_vop_vnoperate(struct vop_generic_args *);*/
55 static int hammer_vop_fsync(struct vop_fsync_args *);
56 static int hammer_vop_read(struct vop_read_args *);
57 static int hammer_vop_write(struct vop_write_args *);
58 static int hammer_vop_access(struct vop_access_args *);
59 static int hammer_vop_advlock(struct vop_advlock_args *);
60 static int hammer_vop_close(struct vop_close_args *);
61 static int hammer_vop_ncreate(struct vop_ncreate_args *);
62 static int hammer_vop_getattr(struct vop_getattr_args *);
63 static int hammer_vop_nresolve(struct vop_nresolve_args *);
64 static int hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *);
65 static int hammer_vop_nlink(struct vop_nlink_args *);
66 static int hammer_vop_nmkdir(struct vop_nmkdir_args *);
67 static int hammer_vop_nmknod(struct vop_nmknod_args *);
68 static int hammer_vop_open(struct vop_open_args *);
69 static int hammer_vop_pathconf(struct vop_pathconf_args *);
70 static int hammer_vop_print(struct vop_print_args *);
71 static int hammer_vop_readdir(struct vop_readdir_args *);
72 static int hammer_vop_readlink(struct vop_readlink_args *);
73 static int hammer_vop_nremove(struct vop_nremove_args *);
74 static int hammer_vop_nrename(struct vop_nrename_args *);
75 static int hammer_vop_nrmdir(struct vop_nrmdir_args *);
76 static int hammer_vop_setattr(struct vop_setattr_args *);
77 static int hammer_vop_strategy(struct vop_strategy_args *);
78 static int hammer_vop_bmap(struct vop_bmap_args *ap);
79 static int hammer_vop_nsymlink(struct vop_nsymlink_args *);
80 static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *);
81 static int hammer_vop_ioctl(struct vop_ioctl_args *);
82 static int hammer_vop_mountctl(struct vop_mountctl_args *);
83
84 static int hammer_vop_fifoclose (struct vop_close_args *);
85 static int hammer_vop_fiforead (struct vop_read_args *);
86 static int hammer_vop_fifowrite (struct vop_write_args *);
87
88 static int hammer_vop_specclose (struct vop_close_args *);
89 static int hammer_vop_specread (struct vop_read_args *);
90 static int hammer_vop_specwrite (struct vop_write_args *);
91
92 struct vop_ops hammer_vnode_vops = {
93 .vop_default = vop_defaultop,
94 .vop_fsync = hammer_vop_fsync,
95 .vop_getpages = vop_stdgetpages,
96 .vop_putpages = vop_stdputpages,
97 .vop_read = hammer_vop_read,
98 .vop_write = hammer_vop_write,
99 .vop_access = hammer_vop_access,
100 .vop_advlock = hammer_vop_advlock,
101 .vop_close = hammer_vop_close,
102 .vop_ncreate = hammer_vop_ncreate,
103 .vop_getattr = hammer_vop_getattr,
104 .vop_inactive = hammer_vop_inactive,
105 .vop_reclaim = hammer_vop_reclaim,
106 .vop_nresolve = hammer_vop_nresolve,
107 .vop_nlookupdotdot = hammer_vop_nlookupdotdot,
108 .vop_nlink = hammer_vop_nlink,
109 .vop_nmkdir = hammer_vop_nmkdir,
110 .vop_nmknod = hammer_vop_nmknod,
111 .vop_open = hammer_vop_open,
112 .vop_pathconf = hammer_vop_pathconf,
113 .vop_print = hammer_vop_print,
114 .vop_readdir = hammer_vop_readdir,
115 .vop_readlink = hammer_vop_readlink,
116 .vop_nremove = hammer_vop_nremove,
117 .vop_nrename = hammer_vop_nrename,
118 .vop_nrmdir = hammer_vop_nrmdir,
119 .vop_setattr = hammer_vop_setattr,
120 .vop_bmap = hammer_vop_bmap,
121 .vop_strategy = hammer_vop_strategy,
122 .vop_nsymlink = hammer_vop_nsymlink,
123 .vop_nwhiteout = hammer_vop_nwhiteout,
124 .vop_ioctl = hammer_vop_ioctl,
125 .vop_mountctl = hammer_vop_mountctl
126 };
127
128 struct vop_ops hammer_spec_vops = {
129 .vop_default = spec_vnoperate,
130 .vop_fsync = hammer_vop_fsync,
131 .vop_read = hammer_vop_specread,
132 .vop_write = hammer_vop_specwrite,
133 .vop_access = hammer_vop_access,
134 .vop_close = hammer_vop_specclose,
135 .vop_getattr = hammer_vop_getattr,
136 .vop_inactive = hammer_vop_inactive,
137 .vop_reclaim = hammer_vop_reclaim,
138 .vop_setattr = hammer_vop_setattr
139 };
140
141 struct vop_ops hammer_fifo_vops = {
142 .vop_default = fifo_vnoperate,
143 .vop_fsync = hammer_vop_fsync,
144 .vop_read = hammer_vop_fiforead,
145 .vop_write = hammer_vop_fifowrite,
146 .vop_access = hammer_vop_access,
147 .vop_close = hammer_vop_fifoclose,
148 .vop_getattr = hammer_vop_getattr,
149 .vop_inactive = hammer_vop_inactive,
150 .vop_reclaim = hammer_vop_reclaim,
151 .vop_setattr = hammer_vop_setattr
152 };
153
154 #ifdef DEBUG_TRUNCATE
155 struct hammer_inode *HammerTruncIp;
156 #endif
157
158 static int hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
159 struct vnode *dvp, struct ucred *cred, int flags);
160 static int hammer_vop_strategy_read(struct vop_strategy_args *ap);
161 static int hammer_vop_strategy_write(struct vop_strategy_args *ap);
162
163 #if 0
164 static
165 int
166 hammer_vop_vnoperate(struct vop_generic_args *)
167 {
168 return (VOCALL(&hammer_vnode_vops, ap));
169 }
170 #endif
171
172 /*
173 * hammer_vop_fsync { vp, waitfor }
174 *
175 * fsync() an inode to disk and wait for it to be completely committed
176 * such that the information would not be undone if a crash occured after
177 * return.
178 */
179 static
180 int
181 hammer_vop_fsync(struct vop_fsync_args *ap)
182 {
183 hammer_inode_t ip = VTOI(ap->a_vp);
184
185 vfsync(ap->a_vp, ap->a_waitfor, 1, NULL, NULL);
186 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
187 if (ap->a_waitfor == MNT_WAIT)
188 hammer_wait_inode(ip);
189 return (ip->error);
190 }
191
192 /*
193 * hammer_vop_read { vp, uio, ioflag, cred }
194 */
195 static
196 int
197 hammer_vop_read(struct vop_read_args *ap)
198 {
199 struct hammer_transaction trans;
200 hammer_inode_t ip;
201 off_t offset;
202 struct buf *bp;
203 struct uio *uio;
204 int error;
205 int n;
206 int seqcount;
207 int ioseqcount;
208 int blksize;
209
210 if (ap->a_vp->v_type != VREG)
211 return (EINVAL);
212 ip = VTOI(ap->a_vp);
213 error = 0;
214 uio = ap->a_uio;
215
216 /*
217 * Allow the UIO's size to override the sequential heuristic.
218 */
219 blksize = hammer_blocksize(uio->uio_offset);
220 seqcount = (uio->uio_resid + (blksize - 1)) / blksize;
221 ioseqcount = ap->a_ioflag >> 16;
222 if (seqcount < ioseqcount)
223 seqcount = ioseqcount;
224
225 hammer_start_transaction(&trans, ip->hmp);
226
227 /*
228 * Access the data typically in HAMMER_BUFSIZE blocks via the
229 * buffer cache, but HAMMER may use a variable block size based
230 * on the offset.
231 */
232 while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) {
233 int64_t base_offset;
234 int64_t file_limit;
235
236 blksize = hammer_blocksize(uio->uio_offset);
237 offset = (int)uio->uio_offset & (blksize - 1);
238 base_offset = uio->uio_offset - offset;
239
240 if (hammer_debug_cluster_enable) {
241 /*
242 * Use file_limit to prevent cluster_read() from
243 * creating buffers of the wrong block size past
244 * the demarc.
245 */
246 file_limit = ip->ino_data.size;
247 if (base_offset < HAMMER_XDEMARC &&
248 file_limit > HAMMER_XDEMARC) {
249 file_limit = HAMMER_XDEMARC;
250 }
251 error = cluster_read(ap->a_vp,
252 file_limit, base_offset,
253 blksize, MAXPHYS,
254 seqcount, &bp);
255 } else {
256 error = bread(ap->a_vp, base_offset, blksize, &bp);
257 }
258 if (error) {
259 kprintf("error %d\n", error);
260 brelse(bp);
261 break;
262 }
263
264 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
265 n = blksize - offset;
266 if (n > uio->uio_resid)
267 n = uio->uio_resid;
268 if (n > ip->ino_data.size - uio->uio_offset)
269 n = (int)(ip->ino_data.size - uio->uio_offset);
270 error = uiomove((char *)bp->b_data + offset, n, uio);
271
272 /* data has a lower priority then meta-data */
273 bp->b_flags |= B_AGE;
274 bqrelse(bp);
275 if (error)
276 break;
277 }
278 if ((ip->flags & HAMMER_INODE_RO) == 0 &&
279 (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) {
280 ip->ino_data.atime = trans.time;
281 hammer_modify_inode(ip, HAMMER_INODE_ATIME);
282 }
283 hammer_done_transaction(&trans);
284 return (error);
285 }
286
287 /*
288 * hammer_vop_write { vp, uio, ioflag, cred }
289 */
290 static
291 int
292 hammer_vop_write(struct vop_write_args *ap)
293 {
294 struct hammer_transaction trans;
295 struct hammer_inode *ip;
296 hammer_mount_t hmp;
297 struct uio *uio;
298 int offset;
299 off_t base_offset;
300 struct buf *bp;
301 int error;
302 int n;
303 int flags;
304 int delta;
305 int seqcount;
306
307 if (ap->a_vp->v_type != VREG)
308 return (EINVAL);
309 ip = VTOI(ap->a_vp);
310 hmp = ip->hmp;
311 error = 0;
312 seqcount = ap->a_ioflag >> 16;
313
314 if (ip->flags & HAMMER_INODE_RO)
315 return (EROFS);
316
317 /*
318 * Create a transaction to cover the operations we perform.
319 */
320 hammer_start_transaction(&trans, hmp);
321 uio = ap->a_uio;
322
323 /*
324 * Check append mode
325 */
326 if (ap->a_ioflag & IO_APPEND)
327 uio->uio_offset = ip->ino_data.size;
328
329 /*
330 * Check for illegal write offsets. Valid range is 0...2^63-1.
331 *
332 * NOTE: the base_off assignment is required to work around what
333 * I consider to be a GCC-4 optimization bug.
334 */
335 if (uio->uio_offset < 0) {
336 hammer_done_transaction(&trans);
337 return (EFBIG);
338 }
339 base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */
340 if (uio->uio_resid > 0 && base_offset <= 0) {
341 hammer_done_transaction(&trans);
342 return (EFBIG);
343 }
344
345 /*
346 * Access the data typically in HAMMER_BUFSIZE blocks via the
347 * buffer cache, but HAMMER may use a variable block size based
348 * on the offset.
349 */
350 while (uio->uio_resid > 0) {
351 int fixsize = 0;
352 int blksize;
353 int blkmask;
354
355 if ((error = hammer_checkspace(hmp, HAMMER_CHECKSPACE_SLOP_WRITE)) != 0)
356 break;
357
358 blksize = hammer_blocksize(uio->uio_offset);
359
360 /*
361 * Do not allow HAMMER to blow out the buffer cache. Very
362 * large UIOs can lockout other processes due to bwillwrite()
363 * mechanics.
364 *
365 * Do not allow HAMMER to blow out system memory by
366 * accumulating too many records. Records are so well
367 * decoupled from the buffer cache that it is possible
368 * for userland to push data out to the media via
369 * direct-write, but build up the records queued to the
370 * backend faster then the backend can flush them out.
371 * HAMMER has hit its write limit but the frontend has
372 * no pushback to slow it down.
373 *
374 * The hammer inode is not locked during these operations.
375 * The vnode is locked which can interfere with the pageout
376 * daemon for non-UIO_NOCOPY writes but should not interfere
377 * with the buffer cache. Even so, we cannot afford to
378 * allow the pageout daemon to build up too many dirty buffer
379 * cache buffers.
380 */
381 bwillwrite(blksize);
382
383 /*
384 * Pending record flush check.
385 */
386 if (hmp->rsv_recs > hammer_limit_recs / 2) {
387 /*
388 * Get the inode on the flush list
389 */
390 if (ip->rsv_recs >= 64)
391 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
392 else if (ip->rsv_recs >= 16)
393 hammer_flush_inode(ip, 0);
394
395 /*
396 * Keep the flusher going if the system keeps
397 * queueing records.
398 */
399 delta = hmp->count_newrecords -
400 hmp->last_newrecords;
401 if (delta < 0 || delta > hammer_limit_recs / 2) {
402 hmp->last_newrecords = hmp->count_newrecords;
403 hammer_sync_hmp(hmp, MNT_NOWAIT);
404 }
405
406 /*
407 * If we have gotten behind start slowing
408 * down the writers.
409 */
410 delta = (hmp->rsv_recs - hammer_limit_recs) *
411 hz / hammer_limit_recs;
412 if (delta > 0)
413 tsleep(&trans, 0, "hmrslo", delta);
414 }
415
416 /*
417 * Calculate the blocksize at the current offset and figure
418 * out how much we can actually write.
419 */
420 blkmask = blksize - 1;
421 offset = (int)uio->uio_offset & blkmask;
422 base_offset = uio->uio_offset & ~(int64_t)blkmask;
423 n = blksize - offset;
424 if (n > uio->uio_resid)
425 n = uio->uio_resid;
426 if (uio->uio_offset + n > ip->ino_data.size) {
427 vnode_pager_setsize(ap->a_vp, uio->uio_offset + n);
428 fixsize = 1;
429 }
430
431 if (uio->uio_segflg == UIO_NOCOPY) {
432 /*
433 * Issuing a write with the same data backing the
434 * buffer. Instantiate the buffer to collect the
435 * backing vm pages, then read-in any missing bits.
436 *
437 * This case is used by vop_stdputpages().
438 */
439 bp = getblk(ap->a_vp, base_offset,
440 blksize, GETBLK_BHEAVY, 0);
441 if ((bp->b_flags & B_CACHE) == 0) {
442 bqrelse(bp);
443 error = bread(ap->a_vp, base_offset,
444 blksize, &bp);
445 }
446 } else if (offset == 0 && uio->uio_resid >= blksize) {
447 /*
448 * Even though we are entirely overwriting the buffer
449 * we may still have to zero it out to avoid a
450 * mmap/write visibility issue.
451 */
452 bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0);
453 if ((bp->b_flags & B_CACHE) == 0)
454 vfs_bio_clrbuf(bp);
455 } else if (base_offset >= ip->ino_data.size) {
456 /*
457 * If the base offset of the buffer is beyond the
458 * file EOF, we don't have to issue a read.
459 */
460 bp = getblk(ap->a_vp, base_offset,
461 blksize, GETBLK_BHEAVY, 0);
462 vfs_bio_clrbuf(bp);
463 } else {
464 /*
465 * Partial overwrite, read in any missing bits then
466 * replace the portion being written.
467 */
468 error = bread(ap->a_vp, base_offset, blksize, &bp);
469 if (error == 0)
470 bheavy(bp);
471 }
472 if (error == 0) {
473 error = uiomove((char *)bp->b_data + offset,
474 n, uio);
475 }
476
477 /*
478 * If we screwed up we have to undo any VM size changes we
479 * made.
480 */
481 if (error) {
482 brelse(bp);
483 if (fixsize) {
484 vtruncbuf(ap->a_vp, ip->ino_data.size,
485 hammer_blocksize(ip->ino_data.size));
486 }
487 break;
488 }
489 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
490 if (ip->ino_data.size < uio->uio_offset) {
491 ip->ino_data.size = uio->uio_offset;
492 flags = HAMMER_INODE_DDIRTY;
493 vnode_pager_setsize(ap->a_vp, ip->ino_data.size);
494 } else {
495 flags = 0;
496 }
497 ip->ino_data.mtime = trans.time;
498 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS;
499 hammer_modify_inode(ip, flags);
500
501 /*
502 * Final buffer disposition.
503 */
504 bp->b_flags |= B_AGE;
505 if (ap->a_ioflag & IO_SYNC) {
506 bwrite(bp);
507 } else if (ap->a_ioflag & IO_DIRECT) {
508 bawrite(bp);
509 } else {
510 bdwrite(bp);
511 }
512 }
513 hammer_done_transaction(&trans);
514 return (error);
515 }
516
517 /*
518 * hammer_vop_access { vp, mode, cred }
519 */
520 static
521 int
522 hammer_vop_access(struct vop_access_args *ap)
523 {
524 struct hammer_inode *ip = VTOI(ap->a_vp);
525 uid_t uid;
526 gid_t gid;
527 int error;
528
529 uid = hammer_to_unix_xid(&ip->ino_data.uid);
530 gid = hammer_to_unix_xid(&ip->ino_data.gid);
531
532 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
533 ip->ino_data.uflags);
534 return (error);
535 }
536
537 /*
538 * hammer_vop_advlock { vp, id, op, fl, flags }
539 */
540 static
541 int
542 hammer_vop_advlock(struct vop_advlock_args *ap)
543 {
544 hammer_inode_t ip = VTOI(ap->a_vp);
545
546 return (lf_advlock(ap, &ip->advlock, ip->ino_data.size));
547 }
548
549 /*
550 * hammer_vop_close { vp, fflag }
551 */
552 static
553 int
554 hammer_vop_close(struct vop_close_args *ap)
555 {
556 hammer_inode_t ip = VTOI(ap->a_vp);
557
558 if ((ip->flags | ip->sync_flags) & HAMMER_INODE_MODMASK)
559 hammer_inode_waitreclaims(ip->hmp);
560 return (vop_stdclose(ap));
561 }
562
563 /*
564 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
565 *
566 * The operating system has already ensured that the directory entry
567 * does not exist and done all appropriate namespace locking.
568 */
569 static
570 int
571 hammer_vop_ncreate(struct vop_ncreate_args *ap)
572 {
573 struct hammer_transaction trans;
574 struct hammer_inode *dip;
575 struct hammer_inode *nip;
576 struct nchandle *nch;
577 int error;
578
579 nch = ap->a_nch;
580 dip = VTOI(ap->a_dvp);
581
582 if (dip->flags & HAMMER_INODE_RO)
583 return (EROFS);
584 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0)
585 return (error);
586
587 /*
588 * Create a transaction to cover the operations we perform.
589 */
590 hammer_start_transaction(&trans, dip->hmp);
591
592 /*
593 * Create a new filesystem object of the requested type. The
594 * returned inode will be referenced and shared-locked to prevent
595 * it from being moved to the flusher.
596 */
597
598 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
599 dip, 0, &nip);
600 if (error) {
601 hkprintf("hammer_create_inode error %d\n", error);
602 hammer_done_transaction(&trans);
603 *ap->a_vpp = NULL;
604 return (error);
605 }
606
607 /*
608 * Add the new filesystem object to the directory. This will also
609 * bump the inode's link count.
610 */
611 error = hammer_ip_add_directory(&trans, dip,
612 nch->ncp->nc_name, nch->ncp->nc_nlen,
613 nip);
614 if (error)
615 hkprintf("hammer_ip_add_directory error %d\n", error);
616
617 /*
618 * Finish up.
619 */
620 if (error) {
621 hammer_rel_inode(nip, 0);
622 hammer_done_transaction(&trans);
623 *ap->a_vpp = NULL;
624 } else {
625 error = hammer_get_vnode(nip, ap->a_vpp);
626 hammer_done_transaction(&trans);
627 hammer_rel_inode(nip, 0);
628 if (error == 0) {
629 cache_setunresolved(ap->a_nch);
630 cache_setvp(ap->a_nch, *ap->a_vpp);
631 }
632 }
633 return (error);
634 }
635
636 /*
637 * hammer_vop_getattr { vp, vap }
638 *
639 * Retrieve an inode's attribute information. When accessing inodes
640 * historically we fake the atime field to ensure consistent results.
641 * The atime field is stored in the B-Tree element and allowed to be
642 * updated without cycling the element.
643 */
644 static
645 int
646 hammer_vop_getattr(struct vop_getattr_args *ap)
647 {
648 struct hammer_inode *ip = VTOI(ap->a_vp);
649 struct vattr *vap = ap->a_vap;
650
651 vap->va_fsid = ip->hmp->fsid_udev;
652 /*
653 * XXX munge the device if we are in a pseudo-fs, so user utilities
654 * do not think its the same 'filesystem'.
655 */
656 if (ip->obj_localization)
657 vap->va_fsid += ip->obj_localization;
658 vap->va_fileid = ip->ino_leaf.base.obj_id;
659 vap->va_mode = ip->ino_data.mode;
660 vap->va_nlink = ip->ino_data.nlinks;
661 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
662 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
663 vap->va_rmajor = 0;
664 vap->va_rminor = 0;
665 vap->va_size = ip->ino_data.size;
666
667 /*
668 * We must provide a consistent atime and mtime for snapshots
669 * so people can do a 'tar cf - ... | md5' on them and get
670 * consistent results.
671 */
672 if (ip->flags & HAMMER_INODE_RO) {
673 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime);
674 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime);
675 } else {
676 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime);
677 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime);
678 }
679 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
680 vap->va_flags = ip->ino_data.uflags;
681 vap->va_gen = 1; /* hammer inums are unique for all time */
682 vap->va_blocksize = HAMMER_BUFSIZE;
683 if (ip->ino_data.size >= HAMMER_XDEMARC) {
684 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) &
685 ~HAMMER_XBUFMASK64;
686 } else if (ip->ino_data.size > HAMMER_BUFSIZE / 2) {
687 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) &
688 ~HAMMER_BUFMASK64;
689 } else {
690 vap->va_bytes = (ip->ino_data.size + 15) & ~15;
691 }
692 vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type);
693 vap->va_filerev = 0; /* XXX */
694 /* mtime uniquely identifies any adjustments made to the file XXX */
695 vap->va_fsmid = ip->ino_data.mtime;
696 vap->va_uid_uuid = ip->ino_data.uid;
697 vap->va_gid_uuid = ip->ino_data.gid;
698 vap->va_fsid_uuid = ip->hmp->fsid;
699 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
700 VA_FSID_UUID_VALID;
701
702 switch (ip->ino_data.obj_type) {
703 case HAMMER_OBJTYPE_CDEV:
704 case HAMMER_OBJTYPE_BDEV:
705 vap->va_rmajor = ip->ino_data.rmajor;
706 vap->va_rminor = ip->ino_data.rminor;
707 break;
708 default:
709 break;
710 }
711
712 return(0);
713 }
714
715 /*
716 * hammer_vop_nresolve { nch, dvp, cred }
717 *
718 * Locate the requested directory entry.
719 */
720 static
721 int
722 hammer_vop_nresolve(struct vop_nresolve_args *ap)
723 {
724 struct hammer_transaction trans;
725 struct namecache *ncp;
726 hammer_inode_t dip;
727 hammer_inode_t ip;
728 hammer_tid_t asof;
729 struct hammer_cursor cursor;
730 struct vnode *vp;
731 int64_t namekey;
732 int error;
733 int i;
734 int nlen;
735 int flags;
736 int64_t obj_id;
737 u_int32_t localization;
738
739 /*
740 * Misc initialization, plus handle as-of name extensions. Look for
741 * the '@@' extension. Note that as-of files and directories cannot
742 * be modified.
743 */
744 dip = VTOI(ap->a_dvp);
745 ncp = ap->a_nch->ncp;
746 asof = dip->obj_asof;
747 nlen = ncp->nc_nlen;
748 flags = dip->flags;
749
750 hammer_simple_transaction(&trans, dip->hmp);
751
752 for (i = 0; i < nlen; ++i) {
753 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
754 asof = hammer_str_to_tid(ncp->nc_name + i + 2);
755 flags |= HAMMER_INODE_RO;
756 break;
757 }
758 }
759 nlen = i;
760
761 /*
762 * If there is no path component the time extension is relative to
763 * dip.
764 */
765 if (nlen == 0) {
766 ip = hammer_get_inode(&trans, dip, dip->obj_id,
767 asof, dip->obj_localization,
768 flags, &error);
769 if (error == 0) {
770 error = hammer_get_vnode(ip, &vp);
771 hammer_rel_inode(ip, 0);
772 } else {
773 vp = NULL;
774 }
775 if (error == 0) {
776 vn_unlock(vp);
777 cache_setvp(ap->a_nch, vp);
778 vrele(vp);
779 }
780 goto done;
781 }
782
783 /*
784 * Calculate the namekey and setup the key range for the scan. This
785 * works kinda like a chained hash table where the lower 32 bits
786 * of the namekey synthesize the chain.
787 *
788 * The key range is inclusive of both key_beg and key_end.
789 */
790 namekey = hammer_directory_namekey(ncp->nc_name, nlen);
791
792 error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip);
793 cursor.key_beg.localization = dip->obj_localization +
794 HAMMER_LOCALIZE_MISC;
795 cursor.key_beg.obj_id = dip->obj_id;
796 cursor.key_beg.key = namekey;
797 cursor.key_beg.create_tid = 0;
798 cursor.key_beg.delete_tid = 0;
799 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
800 cursor.key_beg.obj_type = 0;
801
802 cursor.key_end = cursor.key_beg;
803 cursor.key_end.key |= 0xFFFFFFFFULL;
804 cursor.asof = asof;
805 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
806
807 /*
808 * Scan all matching records (the chain), locate the one matching
809 * the requested path component.
810 *
811 * The hammer_ip_*() functions merge in-memory records with on-disk
812 * records for the purposes of the search.
813 */
814 obj_id = 0;
815 localization = HAMMER_DEF_LOCALIZATION;
816
817 if (error == 0) {
818 error = hammer_ip_first(&cursor);
819 while (error == 0) {
820 error = hammer_ip_resolve_data(&cursor);
821 if (error)
822 break;
823 if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF &&
824 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
825 obj_id = cursor.data->entry.obj_id;
826 localization = cursor.data->entry.localization;
827 break;
828 }
829 error = hammer_ip_next(&cursor);
830 }
831 }
832 hammer_done_cursor(&cursor);
833 if (error == 0) {
834 ip = hammer_get_inode(&trans, dip, obj_id,
835 asof, localization,
836 flags, &error);
837 if (error == 0) {
838 error = hammer_get_vnode(ip, &vp);
839 hammer_rel_inode(ip, 0);
840 } else {
841 vp = NULL;
842 }
843 if (error == 0) {
844 vn_unlock(vp);
845 cache_setvp(ap->a_nch, vp);
846 vrele(vp);
847 }
848 } else if (error == ENOENT) {
849 cache_setvp(ap->a_nch, NULL);
850 }
851 done:
852 hammer_done_transaction(&trans);
853 return (error);
854 }
855
856 /*
857 * hammer_vop_nlookupdotdot { dvp, vpp, cred }
858 *
859 * Locate the parent directory of a directory vnode.
860 *
861 * dvp is referenced but not locked. *vpp must be returned referenced and
862 * locked. A parent_obj_id of 0 does not necessarily indicate that we are
863 * at the root, instead it could indicate that the directory we were in was
864 * removed.
865 *
866 * NOTE: as-of sequences are not linked into the directory structure. If
867 * we are at the root with a different asof then the mount point, reload
868 * the same directory with the mount point's asof. I'm not sure what this
869 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not
870 * get confused, but it hasn't been tested.
871 */
872 static
873 int
874 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
875 {
876 struct hammer_transaction trans;
877 struct hammer_inode *dip;
878 struct hammer_inode *ip;
879 int64_t parent_obj_id;
880 u_int32_t parent_obj_localization;
881 hammer_tid_t asof;
882 int error;
883
884 dip = VTOI(ap->a_dvp);
885 asof = dip->obj_asof;
886
887 /*
888 * Whos are parent? This could be the root of a pseudo-filesystem
889 * whos parent is in another localization domain.
890 */
891 parent_obj_id = dip->ino_data.parent_obj_id;
892 if (dip->obj_id == HAMMER_OBJID_ROOT)
893 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization;
894 else
895 parent_obj_localization = dip->obj_localization;
896
897 if (parent_obj_id == 0) {
898 if (dip->obj_id == HAMMER_OBJID_ROOT &&
899 asof != dip->hmp->asof) {
900 parent_obj_id = dip->obj_id;
901 asof = dip->hmp->asof;
902 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK);
903 ksnprintf(*ap->a_fakename, 19, "0x%016llx",
904 dip->obj_asof);
905 } else {
906 *ap->a_vpp = NULL;
907 return ENOENT;
908 }
909 }
910
911 hammer_simple_transaction(&trans, dip->hmp);
912
913 ip = hammer_get_inode(&trans, dip, parent_obj_id,
914 asof, parent_obj_localization,
915 dip->flags, &error);
916 if (ip) {
917 error = hammer_get_vnode(ip, ap->a_vpp);
918 hammer_rel_inode(ip, 0);
919 } else {
920 *ap->a_vpp = NULL;
921 }
922 hammer_done_transaction(&trans);
923 return (error);
924 }
925
926 /*
927 * hammer_vop_nlink { nch, dvp, vp, cred }
928 */
929 static
930 int
931 hammer_vop_nlink(struct vop_nlink_args *ap)
932 {
933 struct hammer_transaction trans;
934 struct hammer_inode *dip;
935 struct hammer_inode *ip;
936 struct nchandle *nch;
937 int error;
938
939 nch = ap->a_nch;
940 dip = VTOI(ap->a_dvp);
941 ip = VTOI(ap->a_vp);
942
943 if (dip->flags & HAMMER_INODE_RO)
944 return (EROFS);
945 if (ip->flags & HAMMER_INODE_RO)
946 return (EROFS);
947 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0)
948 return (error);
949
950 /*
951 * Create a transaction to cover the operations we perform.
952 */
953 hammer_start_transaction(&trans, dip->hmp);
954
955 /*
956 * Add the filesystem object to the directory. Note that neither
957 * dip nor ip are referenced or locked, but their vnodes are
958 * referenced. This function will bump the inode's link count.
959 */
960 error = hammer_ip_add_directory(&trans, dip,
961 nch->ncp->nc_name, nch->ncp->nc_nlen,
962 ip);
963
964 /*
965 * Finish up.
966 */
967 if (error == 0) {
968 cache_setunresolved(nch);
969 cache_setvp(nch, ap->a_vp);
970 }
971 hammer_done_transaction(&trans);
972 return (error);
973 }
974
975 /*
976 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
977 *
978 * The operating system has already ensured that the directory entry
979 * does not exist and done all appropriate namespace locking.
980 */
981 static
982 int
983 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
984 {
985 struct hammer_transaction trans;
986 struct hammer_inode *dip;
987 struct hammer_inode *nip;
988 struct nchandle *nch;
989 int error;
990
991 nch = ap->a_nch;
992 dip = VTOI(ap->a_dvp);
993
994 if (dip->flags & HAMMER_INODE_RO)
995 return (EROFS);
996 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0)
997 return (error);
998
999 /*
1000 * Create a transaction to cover the operations we perform.
1001 */
1002 hammer_start_transaction(&trans, dip->hmp);
1003
1004 /*
1005 * Create a new filesystem object of the requested type. The
1006 * returned inode will be referenced but not locked.
1007 */
1008 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1009 dip, 0, &nip);
1010 if (error) {
1011 hkprintf("hammer_mkdir error %d\n", error);
1012 hammer_done_transaction(&trans);
1013 *ap->a_vpp = NULL;
1014 return (error);
1015 }
1016 /*
1017 * Add the new filesystem object to the directory. This will also
1018 * bump the inode's link count.
1019 */
1020 error = hammer_ip_add_directory(&trans, dip,
1021 nch->ncp->nc_name, nch->ncp->nc_nlen,
1022 nip);
1023 if (error)
1024 hkprintf("hammer_mkdir (add) error %d\n", error);
1025
1026 /*
1027 * Finish up.
1028 */
1029 if (error) {
1030 hammer_rel_inode(nip, 0);
1031 *ap->a_vpp = NULL;
1032 } else {
1033 error = hammer_get_vnode(nip, ap->a_vpp);
1034 hammer_rel_inode(nip, 0);
1035 if (error == 0) {
1036 cache_setunresolved(ap->a_nch);
1037 cache_setvp(ap->a_nch, *ap->a_vpp);
1038 }
1039 }
1040 hammer_done_transaction(&trans);
1041 return (error);
1042 }
1043
1044 /*
1045 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
1046 *
1047 * The operating system has already ensured that the directory entry
1048 * does not exist and done all appropriate namespace locking.
1049 */
1050 static
1051 int
1052 hammer_vop_nmknod(struct vop_nmknod_args *ap)
1053 {
1054 struct hammer_transaction trans;
1055 struct hammer_inode *dip;
1056 struct hammer_inode *nip;
1057 struct nchandle *nch;
1058 int error;
1059 int pseudofs;
1060
1061 nch = ap->a_nch;
1062 dip = VTOI(ap->a_dvp);
1063
1064 if (dip->flags & HAMMER_INODE_RO)
1065 return (EROFS);
1066 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0)
1067 return (error);
1068
1069 /*
1070 * Create a transaction to cover the operations we perform.
1071 */
1072 hammer_start_transaction(&trans, dip->hmp);
1073
1074 /*
1075 * Create a new filesystem object of the requested type. The
1076 * returned inode will be referenced but not locked.
1077 *
1078 * If mknod specifies a directory a pseudo-fs is created.
1079 */
1080 pseudofs = (ap->a_vap->va_type == VDIR);
1081 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1082 dip, pseudofs, &nip);
1083 if (error) {
1084 hammer_done_transaction(&trans);
1085 *ap->a_vpp = NULL;
1086 return (error);
1087 }
1088
1089 /*
1090 * Add the new filesystem object to the directory. This will also
1091 * bump the inode's link count.
1092 */
1093 error = hammer_ip_add_directory(&trans, dip,
1094 nch->ncp->nc_name, nch->ncp->nc_nlen,
1095 nip);
1096
1097 /*
1098 * Finish up.
1099 */
1100 if (error) {
1101 hammer_rel_inode(nip, 0);
1102 *ap->a_vpp = NULL;
1103 } else {
1104 error = hammer_get_vnode(nip, ap->a_vpp);
1105 hammer_rel_inode(nip, 0);
1106 if (error == 0) {
1107 cache_setunresolved(ap->a_nch);
1108 cache_setvp(ap->a_nch, *ap->a_vpp);
1109 }
1110 }
1111 hammer_done_transaction(&trans);
1112 return (error);
1113 }
1114
1115 /*
1116 * hammer_vop_open { vp, mode, cred, fp }
1117 */
1118 static
1119 int
1120 hammer_vop_open(struct vop_open_args *ap)
1121 {
1122 hammer_inode_t ip;
1123
1124 ip = VTOI(ap->a_vp);
1125
1126 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO))
1127 return (EROFS);
1128 return(vop_stdopen(ap));
1129 }
1130
1131 /*
1132 * hammer_vop_pathconf { vp, name, retval }
1133 */
1134 static
1135 int
1136 hammer_vop_pathconf(struct vop_pathconf_args *ap)
1137 {
1138 return EOPNOTSUPP;
1139 }
1140
1141 /*
1142 * hammer_vop_print { vp }
1143 */
1144 static
1145 int
1146 hammer_vop_print(struct vop_print_args *ap)
1147 {
1148 return EOPNOTSUPP;
1149 }
1150
1151 /*
1152 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
1153 */
1154 static
1155 int
1156 hammer_vop_readdir(struct vop_readdir_args *ap)
1157 {
1158 struct hammer_transaction trans;
1159 struct hammer_cursor cursor;
1160 struct hammer_inode *ip;
1161 struct uio *uio;
1162 hammer_base_elm_t base;
1163 int error;
1164 int cookie_index;
1165 int ncookies;
1166 off_t *cookies;
1167 off_t saveoff;
1168 int r;
1169
1170 ip = VTOI(ap->a_vp);
1171 uio = ap->a_uio;
1172 saveoff = uio->uio_offset;
1173
1174 if (ap->a_ncookies) {
1175 ncookies = uio->uio_resid / 16 + 1;
1176 if (ncookies > 1024)
1177 ncookies = 1024;
1178 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
1179 cookie_index = 0;
1180 } else {
1181 ncookies = -1;
1182 cookies = NULL;
1183 cookie_index = 0;
1184 }
1185
1186 hammer_simple_transaction(&trans, ip->hmp);
1187
1188 /*
1189 * Handle artificial entries
1190 */
1191 error = 0;
1192 if (saveoff == 0) {
1193 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
1194 if (r)
1195 goto done;
1196 if (cookies)
1197 cookies[cookie_index] = saveoff;
1198 ++saveoff;
1199 ++cookie_index;
1200 if (cookie_index == ncookies)
1201 goto done;
1202 }
1203 if (saveoff == 1) {
1204 if (ip->ino_data.parent_obj_id) {
1205 r = vop_write_dirent(&error, uio,
1206 ip->ino_data.parent_obj_id,
1207 DT_DIR, 2, "..");
1208 } else {
1209 r = vop_write_dirent(&error, uio,
1210 ip->obj_id, DT_DIR, 2, "..");
1211 }
1212 if (r)
1213 goto done;
1214 if (cookies)
1215 cookies[cookie_index] = saveoff;
1216 ++saveoff;
1217 ++cookie_index;
1218 if (cookie_index == ncookies)
1219 goto done;
1220 }
1221
1222 /*
1223 * Key range (begin and end inclusive) to scan. Directory keys
1224 * directly translate to a 64 bit 'seek' position.
1225 */
1226 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1227 cursor.key_beg.localization = ip->obj_localization +
1228 HAMMER_LOCALIZE_MISC;
1229 cursor.key_beg.obj_id = ip->obj_id;
1230 cursor.key_beg.create_tid = 0;
1231 cursor.key_beg.delete_tid = 0;
1232 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1233 cursor.key_beg.obj_type = 0;
1234 cursor.key_beg.key = saveoff;
1235
1236 cursor.key_end = cursor.key_beg;
1237 cursor.key_end.key = HAMMER_MAX_KEY;
1238 cursor.asof = ip->obj_asof;
1239 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1240
1241 error = hammer_ip_first(&cursor);
1242
1243 while (error == 0) {
1244 error = hammer_ip_resolve_data(&cursor);
1245 if (error)
1246 break;
1247 base = &cursor.leaf->base;
1248 saveoff = base->key;
1249 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF);
1250
1251 if (base->obj_id != ip->obj_id)
1252 panic("readdir: bad record at %p", cursor.node);
1253
1254 r = vop_write_dirent(
1255 &error, uio, cursor.data->entry.obj_id,
1256 hammer_get_dtype(cursor.leaf->base.obj_type),
1257 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF ,
1258 (void *)cursor.data->entry.name);
1259 if (r)
1260 break;
1261 ++saveoff;
1262 if (cookies)
1263 cookies[cookie_index] = base->key;
1264 ++cookie_index;
1265 if (cookie_index == ncookies)
1266 break;
1267 error = hammer_ip_next(&cursor);
1268 }
1269 hammer_done_cursor(&cursor);
1270
1271 done:
1272 hammer_done_transaction(&trans);
1273
1274 if (ap->a_eofflag)
1275 *ap->a_eofflag = (error == ENOENT);
1276 uio->uio_offset = saveoff;
1277 if (error && cookie_index == 0) {
1278 if (error == ENOENT)
1279 error = 0;
1280 if (cookies) {
1281 kfree(cookies, M_TEMP);
1282 *ap->a_ncookies = 0;
1283 *ap->a_cookies = NULL;
1284 }
1285 } else {
1286 if (error == ENOENT)
1287 error = 0;
1288 if (cookies) {
1289 *ap->a_ncookies = cookie_index;
1290 *ap->a_cookies = cookies;
1291 }
1292 }
1293 return(error);
1294 }
1295
1296 /*
1297 * hammer_vop_readlink { vp, uio, cred }
1298 */
1299 static
1300 int
1301 hammer_vop_readlink(struct vop_readlink_args *ap)
1302 {
1303 struct hammer_transaction trans;
1304 struct hammer_cursor cursor;
1305 struct hammer_inode *ip;
1306 int error;
1307
1308 ip = VTOI(ap->a_vp);
1309
1310 /*
1311 * Shortcut if the symlink data was stuffed into ino_data.
1312 */
1313 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) {
1314 error = uiomove(ip->ino_data.ext.symlink,
1315 ip->ino_data.size, ap->a_uio);
1316 return(error);
1317 }
1318
1319 /*
1320 * Long version
1321 */
1322 hammer_simple_transaction(&trans, ip->hmp);
1323 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1324
1325 /*
1326 * Key range (begin and end inclusive) to scan. Directory keys
1327 * directly translate to a 64 bit 'seek' position.
1328 */
1329 cursor.key_beg.localization = ip->obj_localization +
1330 HAMMER_LOCALIZE_MISC;
1331 cursor.key_beg.obj_id = ip->obj_id;
1332 cursor.key_beg.create_tid = 0;
1333 cursor.key_beg.delete_tid = 0;
1334 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1335 cursor.key_beg.obj_type = 0;
1336 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1337 cursor.asof = ip->obj_asof;
1338 cursor.flags |= HAMMER_CURSOR_ASOF;
1339
1340 error = hammer_ip_lookup(&cursor);
1341 if (error == 0) {
1342 error = hammer_ip_resolve_data(&cursor);
1343 if (error == 0) {
1344 KKASSERT(cursor.leaf->data_len >=
1345 HAMMER_SYMLINK_NAME_OFF);
1346 error = uiomove(cursor.data->symlink.name,
1347 cursor.leaf->data_len -
1348 HAMMER_SYMLINK_NAME_OFF,
1349 ap->a_uio);
1350 }
1351 }
1352 hammer_done_cursor(&cursor);
1353 hammer_done_transaction(&trans);
1354 return(error);
1355 }
1356
1357 /*
1358 * hammer_vop_nremove { nch, dvp, cred }
1359 */
1360 static
1361 int
1362 hammer_vop_nremove(struct vop_nremove_args *ap)
1363 {
1364 struct hammer_transaction trans;
1365 struct hammer_inode *dip;
1366 int error;
1367
1368 dip = VTOI(ap->a_dvp);
1369
1370 if (hammer_nohistory(dip) == 0 &&
1371 (error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_REMOVE)) != 0) {
1372 return (error);
1373 }
1374
1375 hammer_start_transaction(&trans, dip->hmp);
1376 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0);
1377 hammer_done_transaction(&trans);
1378
1379 return (error);
1380 }
1381
1382 /*
1383 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1384 */
1385 static
1386 int
1387 hammer_vop_nrename(struct vop_nrename_args *ap)
1388 {
1389 struct hammer_transaction trans;
1390 struct namecache *fncp;
1391 struct namecache *tncp;
1392 struct hammer_inode *fdip;
1393 struct hammer_inode *tdip;
1394 struct hammer_inode *ip;
1395 struct hammer_cursor cursor;
1396 int64_t namekey;
1397 int nlen, error;
1398
1399 fdip = VTOI(ap->a_fdvp);
1400 tdip = VTOI(ap->a_tdvp);
1401 fncp = ap->a_fnch->ncp;
1402 tncp = ap->a_tnch->ncp;
1403 ip = VTOI(fncp->nc_vp);
1404 KKASSERT(ip != NULL);
1405
1406 if (fdip->flags & HAMMER_INODE_RO)
1407 return (EROFS);
1408 if (tdip->flags & HAMMER_INODE_RO)
1409 return (EROFS);
1410 if (ip->flags & HAMMER_INODE_RO)
1411 return (EROFS);
1412 if ((error = hammer_checkspace(fdip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0)
1413 return (error);
1414
1415 hammer_start_transaction(&trans, fdip->hmp);
1416
1417 /*
1418 * Remove tncp from the target directory and then link ip as
1419 * tncp. XXX pass trans to dounlink
1420 *
1421 * Force the inode sync-time to match the transaction so it is
1422 * in-sync with the creation of the target directory entry.
1423 */
1424 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp, ap->a_cred, 0);
1425 if (error == 0 || error == ENOENT) {
1426 error = hammer_ip_add_directory(&trans, tdip,
1427 tncp->nc_name, tncp->nc_nlen,
1428 ip);
1429 if (error == 0) {
1430 ip->ino_data.parent_obj_id = tdip->obj_id;
1431 hammer_modify_inode(ip, HAMMER_INODE_DDIRTY);
1432 }
1433 }
1434 if (error)
1435 goto failed; /* XXX */
1436
1437 /*
1438 * Locate the record in the originating directory and remove it.
1439 *
1440 * Calculate the namekey and setup the key range for the scan. This
1441 * works kinda like a chained hash table where the lower 32 bits
1442 * of the namekey synthesize the chain.
1443 *
1444 * The key range is inclusive of both key_beg and key_end.
1445 */
1446 namekey = hammer_directory_namekey(fncp->nc_name, fncp->nc_nlen);
1447 retry:
1448 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip);
1449 cursor.key_beg.localization = fdip->obj_localization +
1450 HAMMER_LOCALIZE_MISC;
1451 cursor.key_beg.obj_id = fdip->obj_id;
1452 cursor.key_beg.key = namekey;
1453 cursor.key_beg.create_tid = 0;
1454 cursor.key_beg.delete_tid = 0;
1455 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1456 cursor.key_beg.obj_type = 0;
1457
1458 cursor.key_end = cursor.key_beg;
1459 cursor.key_end.key |= 0xFFFFFFFFULL;
1460 cursor.asof = fdip->obj_asof;
1461 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1462
1463 /*
1464 * Scan all matching records (the chain), locate the one matching
1465 * the requested path component.
1466 *
1467 * The hammer_ip_*() functions merge in-memory records with on-disk
1468 * records for the purposes of the search.
1469 */
1470 error = hammer_ip_first(&cursor);
1471 while (error == 0) {
1472 if (hammer_ip_resolve_data(&cursor) != 0)
1473 break;
1474 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
1475 KKASSERT(nlen > 0);
1476 if (fncp->nc_nlen == nlen &&
1477 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) {
1478 break;
1479 }
1480 error = hammer_ip_next(&cursor);
1481 }
1482
1483 /*
1484 * If all is ok we have to get the inode so we can adjust nlinks.
1485 *
1486 * WARNING: hammer_ip_del_directory() may have to terminate the
1487 * cursor to avoid a recursion. It's ok to call hammer_done_cursor()
1488 * twice.
1489 */
1490 if (error == 0)
1491 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
1492
1493 /*
1494 * XXX A deadlock here will break rename's atomicy for the purposes
1495 * of crash recovery.
1496 */
1497 if (error == EDEADLK) {
1498 hammer_done_cursor(&cursor);
1499 goto retry;
1500 }
1501
1502 /*
1503 * Cleanup and tell the kernel that the rename succeeded.
1504 */
1505 hammer_done_cursor(&cursor);
1506 if (error == 0)
1507 cache_rename(ap->a_fnch, ap->a_tnch);
1508
1509 failed:
1510 hammer_done_transaction(&trans);
1511 return (error);
1512 }
1513
1514 /*
1515 * hammer_vop_nrmdir { nch, dvp, cred }
1516 */
1517 static
1518 int
1519 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
1520 {
1521 struct hammer_transaction trans;
1522 struct hammer_inode *dip;
1523 int error;
1524
1525 dip = VTOI(ap->a_dvp);
1526
1527 if (hammer_nohistory(dip) == 0 &&
1528 (error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_REMOVE)) != 0) {
1529 return (error);
1530 }
1531
1532 hammer_start_transaction(&trans, dip->hmp);
1533 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0);
1534 hammer_done_transaction(&trans);
1535
1536 return (error);
1537 }
1538
1539 /*
1540 * hammer_vop_setattr { vp, vap, cred }
1541 */
1542 static
1543 int
1544 hammer_vop_setattr(struct vop_setattr_args *ap)
1545 {
1546 struct hammer_transaction trans;
1547 struct vattr *vap;
1548 struct hammer_inode *ip;
1549 int modflags;
1550 int error;
1551 int truncating;
1552 int blksize;
1553 int64_t aligned_size;
1554 u_int32_t flags;
1555
1556 vap = ap->a_vap;
1557 ip = ap->a_vp->v_data;
1558 modflags = 0;
1559
1560 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1561 return(EROFS);
1562 if (ip->flags & HAMMER_INODE_RO)
1563 return (EROFS);
1564 if (hammer_nohistory(ip) == 0 &&
1565 (error = hammer_checkspace(ip->hmp, HAMMER_CHECKSPACE_SLOP_REMOVE)) != 0) {
1566 return (error);
1567 }
1568
1569 hammer_start_transaction(&trans, ip->hmp);
1570 error = 0;
1571
1572 if (vap->va_flags != VNOVAL) {
1573 flags = ip->ino_data.uflags;
1574 error = vop_helper_setattr_flags(&flags, vap->va_flags,
1575 hammer_to_unix_xid(&ip->ino_data.uid),
1576 ap->a_cred);
1577 if (error == 0) {
1578 if (ip->ino_data.uflags != flags) {
1579 ip->ino_data.uflags = flags;
1580 modflags |= HAMMER_INODE_DDIRTY;
1581 }
1582 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1583 error = 0;
1584 goto done;
1585 }
1586 }
1587 goto done;
1588 }
1589 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1590 error = EPERM;
1591 goto done;
1592 }
1593 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
1594 mode_t cur_mode = ip->ino_data.mode;
1595 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
1596 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1597 uuid_t uuid_uid;
1598 uuid_t uuid_gid;
1599
1600 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
1601 ap->a_cred,
1602 &cur_uid, &cur_gid, &cur_mode);
1603 if (error == 0) {
1604 hammer_guid_to_uuid(&uuid_uid, cur_uid);
1605 hammer_guid_to_uuid(&uuid_gid, cur_gid);
1606 if (bcmp(&uuid_uid, &ip->ino_data.uid,
1607 sizeof(uuid_uid)) ||
1608 bcmp(&uuid_gid, &ip->ino_data.gid,
1609 sizeof(uuid_gid)) ||
1610 ip->ino_data.mode != cur_mode
1611 ) {
1612 ip->ino_data.uid = uuid_uid;
1613 ip->ino_data.gid = uuid_gid;
1614 ip->ino_data.mode = cur_mode;
1615 }
1616 modflags |= HAMMER_INODE_DDIRTY;
1617 }
1618 }
1619 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) {
1620 switch(ap->a_vp->v_type) {
1621 case VREG:
1622 if (vap->va_size == ip->ino_data.size)
1623 break;
1624 /*
1625 * XXX break atomicy, we can deadlock the backend
1626 * if we do not release the lock. Probably not a
1627 * big deal here.
1628 */
1629 blksize = hammer_blocksize(vap->va_size);
1630 if (vap->va_size < ip->ino_data.size) {
1631 vtruncbuf(ap->a_vp, vap->va_size, blksize);
1632 truncating = 1;
1633 } else {
1634 vnode_pager_setsize(ap->a_vp, vap->va_size);
1635 truncating = 0;
1636 }
1637 ip->ino_data.size = vap->va_size;
1638 modflags |= HAMMER_INODE_DDIRTY;
1639
1640 /*
1641 * on-media truncation is cached in the inode until
1642 * the inode is synchronized.
1643 */
1644 if (truncating) {
1645 hammer_ip_frontend_trunc(ip, vap->va_size);
1646 #ifdef DEBUG_TRUNCATE
1647 if (HammerTruncIp == NULL)
1648 HammerTruncIp = ip;
1649 #endif
1650 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
1651 ip->flags |= HAMMER_INODE_TRUNCATED;
1652 ip->trunc_off = vap->va_size;
1653 #ifdef DEBUG_TRUNCATE
1654 if (ip == HammerTruncIp)
1655 kprintf("truncate1 %016llx\n", ip->trunc_off);
1656 #endif
1657 } else if (ip->trunc_off > vap->va_size) {
1658 ip->trunc_off = vap->va_size;
1659 #ifdef DEBUG_TRUNCATE
1660 if (ip == HammerTruncIp)
1661 kprintf("truncate2 %016llx\n", ip->trunc_off);
1662 #endif
1663 } else {
1664 #ifdef DEBUG_TRUNCATE
1665 if (ip == HammerTruncIp)
1666 kprintf("truncate3 %016llx (ignored)\n", vap->va_size);
1667 #endif
1668 }
1669 }
1670
1671 /*
1672 * If truncating we have to clean out a portion of
1673 * the last block on-disk. We do this in the
1674 * front-end buffer cache.
1675 */
1676 aligned_size = (vap->va_size + (blksize - 1)) &
1677 ~(int64_t)(blksize - 1);
1678 if (truncating && vap->va_size < aligned_size) {
1679 struct buf *bp;
1680 int offset;
1681
1682 aligned_size -= blksize;
1683
1684 offset = (int)vap->va_size & (blksize - 1);
1685 error = bread(ap->a_vp, aligned_size,
1686 blksize, &bp);
1687 hammer_ip_frontend_trunc(ip, aligned_size);
1688 if (error == 0) {
1689 bzero(bp->b_data + offset,
1690 blksize - offset);
1691 bdwrite(bp);
1692 } else {
1693 kprintf("ERROR %d\n", error);
1694 brelse(bp);
1695 }
1696 }
1697 break;
1698 case VDATABASE:
1699 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
1700 ip->flags |= HAMMER_INODE_TRUNCATED;
1701 ip->trunc_off = vap->va_size;
1702 } else if (ip->trunc_off > vap->va_size) {
1703 ip->trunc_off = vap->va_size;
1704 }
1705 hammer_ip_frontend_trunc(ip, vap->va_size);
1706 ip->ino_data.size = vap->va_size;
1707 modflags |= HAMMER_INODE_DDIRTY;
1708 break;
1709 default:
1710 error = EINVAL;
1711 goto done;
1712 }
1713 break;
1714 }
1715 if (vap->va_atime.tv_sec != VNOVAL) {
1716 ip->ino_data.atime =
1717 hammer_timespec_to_time(&vap->va_atime);
1718 modflags |= HAMMER_INODE_ATIME;
1719 }
1720 if (vap->va_mtime.tv_sec != VNOVAL) {
1721 ip->ino_data.mtime =
1722 hammer_timespec_to_time(&vap->va_mtime);
1723 modflags |= HAMMER_INODE_MTIME;
1724 }
1725 if (vap->va_mode != (mode_t)VNOVAL) {
1726 mode_t cur_mode = ip->ino_data.mode;
1727 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
1728 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1729
1730 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
1731 cur_uid, cur_gid, &cur_mode);
1732 if (error == 0 && ip->ino_data.mode != cur_mode) {
1733 ip->ino_data.mode = cur_mode;
1734 modflags |= HAMMER_INODE_DDIRTY;
1735 }
1736 }
1737 done:
1738 if (error == 0)
1739 hammer_modify_inode(ip, modflags);
1740 hammer_done_transaction(&trans);
1741 return (error);
1742 }
1743
1744 /*
1745 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
1746 */
1747 static
1748 int
1749 hammer_vop_nsymlink(struct vop_nsymlink_args *ap)
1750 {
1751 struct hammer_transaction trans;
1752 struct hammer_inode *dip;
1753 struct hammer_inode *nip;
1754 struct nchandle *nch;
1755 hammer_record_t record;
1756 int error;
1757 int bytes;
1758
1759 ap->a_vap->va_type = VLNK;
1760
1761 nch = ap->a_nch;
1762 dip = VTOI(ap->a_dvp);
1763
1764 if (dip->flags & HAMMER_INODE_RO)
1765 return (EROFS);
1766 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0)
1767 return (error);
1768
1769 /*
1770 * Create a transaction to cover the operations we perform.
1771 */
1772 hammer_start_transaction(&trans, dip->hmp);
1773
1774 /*
1775 * Create a new filesystem object of the requested type. The
1776 * returned inode will be referenced but not locked.
1777 */
1778
1779 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1780 dip, 0, &nip);
1781 if (error) {
1782 hammer_done_transaction(&trans);
1783 *ap->a_vpp = NULL;
1784 return (error);
1785 }
1786
1787 /*
1788 * Add a record representing the symlink. symlink stores the link
1789 * as pure data, not a string, and is no \0 terminated.
1790 */
1791 if (error == 0) {
1792 bytes = strlen(ap->a_target);
1793
1794 if (bytes <= HAMMER_INODE_BASESYMLEN) {
1795 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes);
1796 } else {
1797 record = hammer_alloc_mem_record(nip, bytes);
1798 record->type = HAMMER_MEM_RECORD_GENERAL;
1799
1800 record->leaf.base.localization = nip->obj_localization +
1801 HAMMER_LOCALIZE_MISC;
1802 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK;
1803 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX;
1804 record->leaf.data_len = bytes;
1805 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0);
1806 bcopy(ap->a_target, record->data->symlink.name, bytes);
1807 error = hammer_ip_add_record(&trans, record);
1808 }
1809
1810 /*
1811 * Set the file size to the length of the link.
1812 */
1813 if (error == 0) {
1814 nip->ino_data.size = bytes;
1815 hammer_modify_inode(nip, HAMMER_INODE_DDIRTY);
1816 }
1817 }
1818 if (error == 0)
1819 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name,
1820 nch->ncp->nc_nlen, nip);
1821
1822 /*
1823 * Finish up.
1824 */
1825 if (error) {
1826 hammer_rel_inode(nip, 0);
1827 *ap->a_vpp = NULL;
1828 } else {
1829 error = hammer_get_vnode(nip, ap->a_vpp);
1830 hammer_rel_inode(nip, 0);
1831 if (error == 0) {
1832 cache_setunresolved(ap->a_nch);
1833 cache_setvp(ap->a_nch, *ap->a_vpp);
1834 }
1835 }
1836 hammer_done_transaction(&trans);
1837 return (error);
1838 }
1839
1840 /*
1841 * hammer_vop_nwhiteout { nch, dvp, cred, flags }
1842 */
1843 static
1844 int
1845 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap)
1846 {
1847 struct hammer_transaction trans;
1848 struct hammer_inode *dip;
1849 int error;
1850
1851 dip = VTOI(ap->a_dvp);
1852
1853 if (hammer_nohistory(dip) == 0 &&
1854 (error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0) {
1855 return (error);
1856 }
1857
1858 hammer_start_transaction(&trans, dip->hmp);
1859 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp,
1860 ap->a_cred, ap->a_flags);
1861 hammer_done_transaction(&trans);
1862
1863 return (error);
1864 }
1865
1866 /*
1867 * hammer_vop_ioctl { vp, command, data, fflag, cred }
1868 */
1869 static
1870 int
1871 hammer_vop_ioctl(struct vop_ioctl_args *ap)
1872 {
1873 struct hammer_inode *ip = ap->a_vp->v_data;
1874
1875 return(hammer_ioctl(ip, ap->a_command, ap->a_data,
1876 ap->a_fflag, ap->a_cred));
1877 }
1878
1879 static
1880 int
1881 hammer_vop_mountctl(struct vop_mountctl_args *ap)
1882 {
1883 struct mount *mp;
1884 int error;
1885
1886 mp = ap->a_head.a_ops->head.vv_mount;
1887
1888 switch(ap->a_op) {
1889 case MOUNTCTL_SET_EXPORT:
1890 if (ap->a_ctllen != sizeof(struct export_args))
1891 error = EINVAL;
1892 error = hammer_vfs_export(mp, ap->a_op,
1893 (const struct export_args *)ap->a_ctl);
1894 break;
1895 default:
1896 error = journal_mountctl(ap);
1897 break;
1898 }
1899 return(error);
1900 }
1901
1902 /*
1903 * hammer_vop_strategy { vp, bio }
1904 *
1905 * Strategy call, used for regular file read & write only. Note that the
1906 * bp may represent a cluster.
1907 *
1908 * To simplify operation and allow better optimizations in the future,
1909 * this code does not make any assumptions with regards to buffer alignment
1910 * or size.
1911 */
1912 static
1913 int
1914 hammer_vop_strategy(struct vop_strategy_args *ap)
1915 {
1916 struct buf *bp;
1917 int error;
1918
1919 bp = ap->a_bio->bio_buf;
1920
1921 switch(bp->b_cmd) {
1922 case BUF_CMD_READ:
1923 error = hammer_vop_strategy_read(ap);
1924 break;
1925 case BUF_CMD_WRITE:
1926 error = hammer_vop_strategy_write(ap);
1927 break;
1928 default:
1929 bp->b_error = error = EINVAL;
1930 bp->b_flags |= B_ERROR;
1931 biodone(ap->a_bio);
1932 break;
1933 }
1934 return (error);
1935 }
1936
1937 /*
1938 * Read from a regular file. Iterate the related records and fill in the
1939 * BIO/BUF. Gaps are zero-filled.
1940 *
1941 * The support code in hammer_object.c should be used to deal with mixed
1942 * in-memory and on-disk records.
1943 *
1944 * NOTE: Can be called from the cluster code with an oversized buf.
1945 *
1946 * XXX atime update
1947 */
1948 static
1949 int
1950 hammer_vop_strategy_read(struct vop_strategy_args *ap)
1951 {
1952 struct hammer_transaction trans;
1953 struct hammer_inode *ip;
1954 struct hammer_cursor cursor;
1955 hammer_base_elm_t base;
1956 hammer_off_t disk_offset;
1957 struct bio *bio;
1958 struct bio *nbio;
1959 struct buf *bp;
1960 int64_t rec_offset;
1961 int64_t ran_end;
1962 int64_t tmp64;
1963 int error;
1964 int boff;
1965 int roff;
1966 int n;
1967
1968 bio = ap->a_bio;
1969 bp = bio->bio_buf;
1970 ip = ap->a_vp->v_data;
1971
1972 /*
1973 * The zone-2 disk offset may have been set by the cluster code via
1974 * a BMAP operation, or else should be NOOFFSET.
1975 *
1976 * Checking the high bits for a match against zone-2 should suffice.
1977 */
1978 nbio = push_bio(bio);
1979 if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) ==
1980 HAMMER_ZONE_RAW_BUFFER) {
1981 error = hammer_io_direct_read(ip->hmp, nbio);
1982 return (error);
1983 }
1984
1985 /*
1986 * Well, that sucked. Do it the hard way. If all the stars are
1987 * aligned we may still be able to issue a direct-read.
1988 */
1989 hammer_simple_transaction(&trans, ip->hmp);
1990 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1991
1992 /*
1993 * Key range (begin and end inclusive) to scan. Note that the key's
1994 * stored in the actual records represent BASE+LEN, not BASE. The
1995 * first record containing bio_offset will have a key > bio_offset.
1996 */
1997 cursor.key_beg.localization = ip->obj_localization +
1998 HAMMER_LOCALIZE_MISC;
1999 cursor.key_beg.obj_id = ip->obj_id;
2000 cursor.key_beg.create_tid = 0;
2001 cursor.key_beg.delete_tid = 0;
2002 cursor.key_beg.obj_type = 0;
2003 cursor.key_beg.key = bio->bio_offset + 1;
2004 cursor.asof = ip->obj_asof;
2005 cursor.flags |= HAMMER_CURSOR_ASOF;
2006
2007 cursor.key_end = cursor.key_beg;
2008 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2009 #if 0
2010 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) {
2011 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
2012 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
2013 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2014 } else
2015 #endif
2016 {
2017 ran_end = bio->bio_offset + bp->b_bufsize;
2018 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2019 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2020 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2021 if (tmp64 < ran_end)
2022 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2023 else
2024 cursor.key_end.key = ran_end + MAXPHYS + 1;
2025 }
2026 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2027
2028 error = hammer_ip_first(&cursor);
2029 boff = 0;
2030
2031 while (error == 0) {
2032 /*
2033 * Get the base file offset of the record. The key for
2034 * data records is (base + bytes) rather then (base).
2035 */
2036 base = &cursor.leaf->base;
2037 rec_offset = base->key - cursor.leaf->data_len;
2038
2039 /*
2040 * Calculate the gap, if any, and zero-fill it.
2041 *
2042 * n is the offset of the start of the record verses our
2043 * current seek offset in the bio.
2044 */
2045 n = (int)(rec_offset - (bio->bio_offset + boff));
2046 if (n > 0) {
2047 if (n > bp->b_bufsize - boff)
2048 n = bp->b_bufsize - boff;
2049 bzero((char *)bp->b_data + boff, n);
2050 boff += n;
2051 n = 0;
2052 }
2053
2054 /*
2055 * Calculate the data offset in the record and the number
2056 * of bytes we can copy.
2057 *
2058 * There are two degenerate cases. First, boff may already
2059 * be at bp->b_bufsize. Secondly, the data offset within
2060 * the record may exceed the record's size.
2061 */
2062 roff = -n;
2063 rec_offset += roff;
2064 n = cursor.leaf->data_len - roff;
2065 if (n <= 0) {
2066 kprintf("strategy_read: bad n=%d roff=%d\n", n, roff);
2067 n = 0;
2068 } else if (n > bp->b_bufsize - boff) {
2069 n = bp->b_bufsize - boff;
2070 }
2071
2072 /*
2073 * Deal with cached truncations. This cool bit of code
2074 * allows truncate()/ftruncate() to avoid having to sync
2075 * the file.
2076 *
2077 * If the frontend is truncated then all backend records are
2078 * subject to the frontend's truncation.
2079 *
2080 * If the backend is truncated then backend records on-disk
2081 * (but not in-memory) are subject to the backend's
2082 * truncation. In-memory records owned by the backend
2083 * represent data written after the truncation point on the
2084 * backend and must not be truncated.
2085 *
2086 * Truncate operations deal with frontend buffer cache
2087 * buffers and frontend-owned in-memory records synchronously.
2088 */
2089 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2090 if (hammer_cursor_ondisk(&cursor) ||
2091 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2092 if (ip->trunc_off <= rec_offset)
2093 n = 0;
2094 else if (ip->trunc_off < rec_offset + n)
2095 n = (int)(ip->trunc_off - rec_offset);
2096 }
2097 }
2098 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2099 if (hammer_cursor_ondisk(&cursor)) {
2100 if (ip->sync_trunc_off <= rec_offset)
2101 n = 0;
2102 else if (ip->sync_trunc_off < rec_offset + n)
2103 n = (int)(ip->sync_trunc_off - rec_offset);
2104 }
2105 }
2106
2107 /*
2108 * Try to issue a direct read into our bio if possible,
2109 * otherwise resolve the element data into a hammer_buffer
2110 * and copy.
2111 *
2112 * The buffer on-disk should be zerod past any real
2113 * truncation point, but may not be for any synthesized
2114 * truncation point from above.
2115 */
2116 if (boff == 0 && n == bp->b_bufsize &&
2117 ((cursor.leaf->data_offset + roff) & HAMMER_BUFMASK) == 0) {
2118 disk_offset = hammer_blockmap_lookup(
2119 trans.hmp,
2120 cursor.leaf->data_offset + roff,
2121 &error);
2122 if (error)
2123 break;
2124 nbio->bio_offset = disk_offset;
2125 error = hammer_io_direct_read(trans.hmp, nbio);
2126 goto done;
2127 } else if (n) {
2128 error = hammer_ip_resolve_data(&cursor);
2129 if (error == 0) {
2130 bcopy((char *)cursor.data + roff,
2131 (char *)bp->b_data + boff, n);
2132 }
2133 }
2134 if (error)
2135 break;
2136
2137 /*
2138 * Iterate until we have filled the request.
2139 */
2140 boff += n;
2141 if (boff == bp->b_bufsize)
2142 break;
2143 error = hammer_ip_next(&cursor);
2144 }
2145
2146 /*
2147 * There may have been a gap after the last record
2148 */
2149 if (error == ENOENT)
2150 error = 0;
2151 if (error == 0 && boff != bp->b_bufsize) {
2152 KKASSERT(boff < bp->b_bufsize);
2153 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
2154 /* boff = bp->b_bufsize; */
2155 }
2156 bp->b_resid = 0;
2157 bp->b_error = error;
2158 if (error)
2159 bp->b_flags |= B_ERROR;
2160 biodone(ap->a_bio);
2161
2162 done:
2163 if (cursor.node)
2164 hammer_cache_node(&ip->cache[1], cursor.node);
2165 hammer_done_cursor(&cursor);
2166 hammer_done_transaction(&trans);
2167 return(error);
2168 }
2169
2170 /*
2171 * BMAP operation - used to support cluster_read() only.
2172 *
2173 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb)
2174 *
2175 * This routine may return EOPNOTSUPP if the opration is not supported for
2176 * the specified offset. The contents of the pointer arguments do not
2177 * need to be initialized in that case.
2178 *
2179 * If a disk address is available and properly aligned return 0 with
2180 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately
2181 * to the run-length relative to that offset. Callers may assume that
2182 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently
2183 * large, so return EOPNOTSUPP if it is not sufficiently large.
2184 */
2185 static
2186 int
2187 hammer_vop_bmap(struct vop_bmap_args *ap)
2188 {
2189 struct hammer_transaction trans;
2190 struct hammer_inode *ip;
2191 struct hammer_cursor cursor;
2192 hammer_base_elm_t base;
2193 int64_t rec_offset;
2194 int64_t ran_end;
2195 int64_t tmp64;
2196 int64_t base_offset;
2197 int64_t base_disk_offset;
2198 int64_t last_offset;
2199 hammer_off_t last_disk_offset;
2200 hammer_off_t disk_offset;
2201 int rec_len;
2202 int error;
2203 int blksize;
2204
2205 ip = ap->a_vp->v_data;
2206
2207 /*
2208 * We can only BMAP regular files. We can't BMAP database files,
2209 * directories, etc.
2210 */
2211 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE)
2212 return(EOPNOTSUPP);
2213
2214 /*
2215 * bmap is typically called with runp/runb both NULL when used
2216 * for writing. We do not support BMAP for writing atm.
2217 */
2218 if (ap->a_cmd != BUF_CMD_READ)
2219 return(EOPNOTSUPP);
2220
2221 /*
2222 * Scan the B-Tree to acquire blockmap addresses, then translate
2223 * to raw addresses.
2224 */
2225 hammer_simple_transaction(&trans, ip->hmp);
2226 #if 0
2227 kprintf("bmap_beg %016llx ip->cache %p\n", ap->a_loffset, ip->cache[1]);
2228 #endif
2229 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2230
2231 /*
2232 * Key range (begin and end inclusive) to scan. Note that the key's
2233 * stored in the actual records represent BASE+LEN, not BASE. The
2234 * first record containing bio_offset will have a key > bio_offset.
2235 */
2236 cursor.key_beg.localization = ip->obj_localization +
2237 HAMMER_LOCALIZE_MISC;
2238 cursor.key_beg.obj_id = ip->obj_id;
2239 cursor.key_beg.create_tid = 0;
2240 cursor.key_beg.delete_tid = 0;
2241 cursor.key_beg.obj_type = 0;
2242 if (ap->a_runb)
2243 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1;
2244 else
2245 cursor.key_beg.key = ap->a_loffset + 1;
2246 if (cursor.key_beg.key < 0)
2247 cursor.key_beg.key = 0;
2248 cursor.asof = ip->obj_asof;
2249 cursor.flags |= HAMMER_CURSOR_ASOF;
2250
2251 cursor.key_end = cursor.key_beg;
2252 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2253
2254 ran_end = ap->a_loffset + MAXPHYS;
2255 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2256 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2257 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2258 if (tmp64 < ran_end)
2259 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2260 else
2261 cursor.key_end.key = ran_end + MAXPHYS + 1;
2262
2263 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2264
2265 error = hammer_ip_first(&cursor);
2266 base_offset = last_offset = 0;
2267 base_disk_offset = last_disk_offset = 0;
2268
2269 while (error == 0) {
2270 /*
2271 * Get the base file offset of the record. The key for
2272 * data records is (base + bytes) rather then (base).
2273 *
2274 * NOTE: rec_offset + rec_len may exceed the end-of-file.
2275 * The extra bytes should be zero on-disk and the BMAP op
2276 * should still be ok.
2277 */
2278 base = &cursor.leaf->base;
2279 rec_offset = base->key - cursor.leaf->data_len;
2280 rec_len = cursor.leaf->data_len;
2281
2282 /*
2283 * Incorporate any cached truncation.
2284 *
2285 * NOTE: Modifications to rec_len based on synthesized
2286 * truncation points remove the guarantee that any extended
2287 * data on disk is zero (since the truncations may not have
2288 * taken place on-media yet).
2289 */
2290 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2291 if (hammer_cursor_ondisk(&cursor) ||
2292 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2293 if (ip->trunc_off <= rec_offset)
2294 rec_len = 0;
2295 else if (ip->trunc_off < rec_offset + rec_len)
2296 rec_len = (int)(ip->trunc_off - rec_offset);
2297 }
2298 }
2299 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2300 if (hammer_cursor_ondisk(&cursor)) {
2301 if (ip->sync_trunc_off <= rec_offset)
2302 rec_len = 0;
2303 else if (ip->sync_trunc_off < rec_offset + rec_len)
2304 rec_len = (int)(ip->sync_trunc_off - rec_offset);
2305 }
2306 }
2307
2308 /*
2309 * Accumulate information. If we have hit a discontiguous
2310 * block reset base_offset unless we are already beyond the
2311 * requested offset. If we are, that's it, we stop.
2312 */
2313 disk_offset = hammer_blockmap_lookup(trans.hmp,
2314 cursor.leaf->data_offset,
2315 &error);
2316 if (error)
2317 break;
2318 if (rec_offset != last_offset ||
2319 disk_offset != last_disk_offset) {
2320 if (rec_offset > ap->a_loffset)
2321 break;
2322 base_offset = rec_offset;
2323 base_disk_offset = disk_offset;
2324 }
2325 last_offset = rec_offset + rec_len;
2326 last_disk_offset = disk_offset + rec_len;
2327
2328 error = hammer_ip_next(&cursor);
2329 }
2330
2331 #if 0
2332 kprintf("BMAP %016llx: %016llx - %016llx\n",
2333 ap->a_loffset, base_offset, last_offset);
2334 kprintf("BMAP %16s: %016llx - %016llx\n",
2335 "", base_disk_offset, last_disk_offset);
2336 #endif
2337
2338 if (cursor.node) {
2339 hammer_cache_node(&ip->cache[1], cursor.node);
2340 #if 0
2341 kprintf("bmap_end2 %016llx ip->cache %p\n", ap->a_loffset, ip->cache[1]);
2342 #endif
2343 }
2344 hammer_done_cursor(&cursor);
2345 hammer_done_transaction(&trans);
2346
2347 /*
2348 * If we couldn't find any records or the records we did find were
2349 * all behind the requested offset, return failure. A forward
2350 * truncation can leave a hole w/ no on-disk records.
2351 */
2352 if (last_offset == 0 || last_offset < ap->a_loffset)
2353 return (EOPNOTSUPP);
2354
2355 /*
2356 * Figure out the block size at the requested offset and adjust
2357 * our limits so the cluster_read() does not create inappropriately
2358 * sized buffer cache buffers.
2359 */
2360 blksize = hammer_blocksize(ap->a_loffset);
2361 if (hammer_blocksize(base_offset) != blksize) {
2362 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset);
2363 }
2364 if (last_offset != ap->a_loffset &&
2365 hammer_blocksize(last_offset - 1) != blksize) {
2366 last_offset = hammer_blockdemarc(ap->a_loffset,
2367 last_offset - 1);
2368 }
2369
2370 /*
2371 * Returning EOPNOTSUPP simply prevents the direct-IO optimization
2372 * from occuring.
2373 */
2374 disk_offset = base_disk_offset + (ap->a_loffset - base_offset);
2375
2376 /*
2377 * If doffsetp is not aligned or the forward run size does
2378 * not cover a whole buffer, disallow the direct I/O.
2379 */
2380 if ((disk_offset & HAMMER_BUFMASK) ||
2381 (last_offset - ap->a_loffset) < blksize) {
2382 error = EOPNOTSUPP;
2383 } else {
2384 *ap->a_doffsetp = disk_offset;
2385 if (ap->a_runb) {
2386 *ap->a_runb = ap->a_loffset - base_offset;
2387 KKASSERT(*ap->a_runb >= 0);
2388 }
2389 if (ap->a_runp) {
2390 *ap->a_runp = last_offset - ap->a_loffset;
2391 KKASSERT(*ap->a_runp >= 0);
2392 }
2393 error = 0;
2394 }
2395 return(error);
2396 }
2397
2398 /*
2399 * Write to a regular file. Because this is a strategy call the OS is
2400 * trying to actually get data onto the media.
2401 */
2402 static
2403 int
2404 hammer_vop_strategy_write(struct vop_strategy_args *ap)
2405 {
2406 hammer_record_t record;
2407 hammer_mount_t hmp;
2408 hammer_inode_t ip;
2409 struct bio *bio;
2410 struct buf *bp;
2411 int blksize;
2412 int bytes;
2413 int error;
2414
2415 bio = ap->a_bio;
2416 bp = bio->bio_buf;
2417 ip = ap->a_vp->v_data;
2418 hmp = ip->hmp;
2419
2420 blksize = hammer_blocksize(bio->bio_offset);
2421 KKASSERT(bp->b_bufsize == blksize);
2422
2423 if (ip->flags & HAMMER_INODE_RO) {
2424 bp->b_error = EROFS;
2425 bp->b_flags |= B_ERROR;
2426 biodone(ap->a_bio);
2427 return(EROFS);
2428 }
2429
2430 /*
2431 * Interlock with inode destruction (no in-kernel or directory
2432 * topology visibility). If we queue new IO while trying to
2433 * destroy the inode we can deadlock the vtrunc call in
2434 * hammer_inode_unloadable_check().
2435 */
2436 if (ip->flags & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) {
2437 bp->b_resid = 0;
2438 biodone(ap->a_bio);
2439 return(0);
2440 }
2441
2442 /*
2443 * Reserve space and issue a direct-write from the front-end.
2444 * NOTE: The direct_io code will hammer_bread/bcopy smaller
2445 * allocations.
2446 *
2447 * An in-memory record will be installed to reference the storage
2448 * until the flusher can get to it.
2449 *
2450 * Since we own the high level bio the front-end will not try to
2451 * do a direct-read until the write completes.
2452 *
2453 * NOTE: The only time we do not reserve a full-sized buffers
2454 * worth of data is if the file is small. We do not try to
2455 * allocate a fragment (from the small-data zone) at the end of
2456 * an otherwise large file as this can lead to wildly separated
2457 * data.
2458 */
2459 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0);
2460 KKASSERT(bio->bio_offset < ip->ino_data.size);
2461 if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2)
2462 bytes = bp->b_bufsize;
2463 else
2464 bytes = ((int)ip->ino_data.size + 15) & ~15;
2465
2466 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data,
2467 bytes, &error);
2468 if (record) {
2469 hammer_io_direct_write(hmp, &record->leaf, bio);
2470 hammer_rel_mem_record(record);
2471 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs)
2472 hammer_flush_inode(ip, 0);
2473 } else {
2474 bp->b_bio2.bio_offset = NOOFFSET;
2475 bp->b_error = error;
2476 bp->b_flags |= B_ERROR;
2477 biodone(ap->a_bio);
2478 }
2479 return(error);
2480 }
2481
2482 /*
2483 * dounlink - disconnect a directory entry
2484 *
2485 * XXX whiteout support not really in yet
2486 */
2487 static int
2488 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
2489 struct vnode *dvp, struct ucred *cred, int flags)
2490 {
2491 struct namecache *ncp;
2492 hammer_inode_t dip;
2493 hammer_inode_t ip;
2494 struct hammer_cursor cursor;
2495 int64_t namekey;
2496 int nlen, error;
2497
2498 /*
2499 * Calculate the namekey and setup the key range for the scan. This
2500 * works kinda like a chained hash table where the lower 32 bits
2501 * of the namekey synthesize the chain.
2502 *
2503 * The key range is inclusive of both key_beg and key_end.
2504 */
2505 dip = VTOI(dvp);
2506 ncp = nch->ncp;
2507
2508 if (dip->flags & HAMMER_INODE_RO)
2509 return (EROFS);
2510
2511 namekey = hammer_directory_namekey(ncp->nc_name, ncp->nc_nlen);
2512 retry:
2513 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip);
2514 cursor.key_beg.localization = dip->obj_localization +
2515 HAMMER_LOCALIZE_MISC;
2516 cursor.key_beg.obj_id = dip->obj_id;
2517 cursor.key_beg.key = namekey;
2518 cursor.key_beg.create_tid = 0;
2519 cursor.key_beg.delete_tid = 0;
2520 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
2521 cursor.key_beg.obj_type = 0;
2522
2523 cursor.key_end = cursor.key_beg;
2524 cursor.key_end.key |= 0xFFFFFFFFULL;
2525 cursor.asof = dip->obj_asof;
2526 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
2527
2528 /*
2529 * Scan all matching records (the chain), locate the one matching
2530 * the requested path component. info->last_error contains the
2531 * error code on search termination and could be 0, ENOENT, or
2532 * something else.
2533 *
2534 * The hammer_ip_*() functions merge in-memory records with on-disk
2535 * records for the purposes of the search.
2536 */
2537 error = hammer_ip_first(&cursor);
2538
2539 while (error == 0) {
2540 error = hammer_ip_resolve_data(&cursor);
2541 if (error)
2542 break;
2543 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
2544 KKASSERT(nlen > 0);
2545 if (ncp->nc_nlen == nlen &&
2546 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
2547 break;
2548 }
2549 error = hammer_ip_next(&cursor);
2550 }
2551
2552 /*
2553 * If all is ok we have to get the inode so we can adjust nlinks.
2554 * To avoid a deadlock with the flusher we must release the inode
2555 * lock on the directory when acquiring the inode for the entry.
2556 *
2557 * If the target is a directory, it must be empty.
2558 */
2559 if (error == 0) {
2560 hammer_unlock(&cursor.ip->lock);
2561 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id,
2562 dip->hmp->asof,
2563 cursor.data->entry.localization,
2564 0, &error);
2565 hammer_lock_sh(&cursor.ip->lock);
2566 if (error == ENOENT) {
2567 kprintf("obj_id %016llx\n", cursor.data->entry.obj_id);
2568 Debugger("ENOENT unlinking object that should exist");
2569 }
2570
2571 /*
2572 * If we are trying to remove a directory the directory must
2573 * be empty.
2574 *
2575 * WARNING: hammer_ip_check_directory_empty() may have to
2576 * terminate the cursor to avoid a deadlock. It is ok to
2577 * call hammer_done_cursor() twice.
2578 */
2579 if (error == 0 && ip->ino_data.obj_type ==
2580 HAMMER_OBJTYPE_DIRECTORY) {
2581 error = hammer_ip_check_directory_empty(trans, ip);
2582 }
2583
2584 /*
2585 * Delete the directory entry.
2586 *
2587 * WARNING: hammer_ip_del_directory() may have to terminate
2588 * the cursor to avoid a deadlock. It is ok to call
2589 * hammer_done_cursor() twice.
2590 */
2591 if (error == 0) {
2592 error = hammer_ip_del_directory(trans, &cursor,
2593 dip, ip);
2594 }
2595 hammer_done_cursor(&cursor);
2596 if (error == 0) {
2597 cache_setunresolved(nch);
2598 cache_setvp(nch, NULL);
2599 /* XXX locking */
2600 if (ip->vp)
2601 cache_inval_vp(ip->vp, CINV_DESTROY);
2602 }
2603 if (ip)
2604 hammer_rel_inode(ip, 0);
2605 } else {
2606 hammer_done_cursor(&cursor);
2607 }
2608 if (error == EDEADLK)
2609 goto retry;
2610
2611 return (error);
2612 }
2613
2614 /************************************************************************
2615 * FIFO AND SPECFS OPS *
2616 ************************************************************************
2617 *
2618 */
2619
2620 static int
2621 hammer_vop_fifoclose (struct vop_close_args *ap)
2622 {
2623 /* XXX update itimes */
2624 return (VOCALL(&fifo_vnode_vops, &ap->a_head));
2625 }
2626
2627 static int
2628 hammer_vop_fiforead (struct vop_read_args *ap)
2629 {
2630 int error;
2631
2632 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2633 /* XXX update access time */
2634 return (error);
2635 }
2636
2637 static int
2638 hammer_vop_fifowrite (struct vop_write_args *ap)
2639 {
2640 int error;
2641
2642 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2643 /* XXX update access time */
2644 return (error);
2645 }
2646
2647 static int
2648 hammer_vop_specclose (struct vop_close_args *ap)
2649 {
2650 /* XXX update itimes */
2651 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2652 }
2653
2654 static int
2655 hammer_vop_specread (struct vop_read_args *ap)
2656 {
2657 /* XXX update access time */
2658 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2659 }
2660
2661 static int
2662 hammer_vop_specwrite (struct vop_write_args *ap)
2663 {
2664 /* XXX update last change time */
2665 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2666 }
2667
DragonFly BSD