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HAMMER 60I/Many: Mirroring
[dragonfly.git] / sys / vfs / hammer / hammer_vnops.c
blobc1050e2a154b88d68ef4e4d7f8c236a1925270fc
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 1.84 2008/07/09 10:29:20 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 * The hammer inode is not locked during these operations.
366 * The vnode is locked which can interfere with the pageout
367 * daemon for non-UIO_NOCOPY writes but should not interfere
368 * with the buffer cache. Even so, we cannot afford to
369 * allow the pageout daemon to build up too many dirty buffer
370 * cache buffers.
371 */
372 /*if (((int)uio->uio_offset & (blksize - 1)) == 0)*/
373 bwillwrite(blksize);
374
375 /*
376 * Do not allow HAMMER to blow out system memory by
377 * accumulating too many records. Records are so well
378 * decoupled from the buffer cache that it is possible
379 * for userland to push data out to the media via
380 * direct-write, but build up the records queued to the
381 * backend faster then the backend can flush them out.
382 * HAMMER has hit its write limit but the frontend has
383 * no pushback to slow it down.
384 */
385 if (hmp->rsv_recs > hammer_limit_recs / 2) {
386 /*
387 * Get the inode on the flush list
388 */
389 if (ip->rsv_recs >= 64)
390 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
391 else if (ip->rsv_recs >= 16)
392 hammer_flush_inode(ip, 0);
393
394 /*
395 * Keep the flusher going if the system keeps
396 * queueing records.
397 */
398 delta = hmp->count_newrecords -
399 hmp->last_newrecords;
400 if (delta < 0 || delta > hammer_limit_recs / 2) {
401 hmp->last_newrecords = hmp->count_newrecords;
402 hammer_sync_hmp(hmp, MNT_NOWAIT);
403 }
404
405 /*
406 * If we have gotten behind start slowing
407 * down the writers.
408 */
409 delta = (hmp->rsv_recs - hammer_limit_recs) *
410 hz / hammer_limit_recs;
411 if (delta > 0)
412 tsleep(&trans, 0, "hmrslo", delta);
413 }
414
415 /*
416 * Calculate the blocksize at the current offset and figure
417 * out how much we can actually write.
418 */
419 blkmask = blksize - 1;
420 offset = (int)uio->uio_offset & blkmask;
421 base_offset = uio->uio_offset & ~(int64_t)blkmask;
422 n = blksize - offset;
423 if (n > uio->uio_resid)
424 n = uio->uio_resid;
425 if (uio->uio_offset + n > ip->ino_data.size) {
426 vnode_pager_setsize(ap->a_vp, uio->uio_offset + n);
427 fixsize = 1;
428 }
429
430 if (uio->uio_segflg == UIO_NOCOPY) {
431 /*
432 * Issuing a write with the same data backing the
433 * buffer. Instantiate the buffer to collect the
434 * backing vm pages, then read-in any missing bits.
435 *
436 * This case is used by vop_stdputpages().
437 */
438 bp = getblk(ap->a_vp, base_offset,
439 blksize, GETBLK_BHEAVY, 0);
440 if ((bp->b_flags & B_CACHE) == 0) {
441 bqrelse(bp);
442 error = bread(ap->a_vp, base_offset,
443 blksize, &bp);
444 }
445 } else if (offset == 0 && uio->uio_resid >= blksize) {
446 /*
447 * Even though we are entirely overwriting the buffer
448 * we may still have to zero it out to avoid a
449 * mmap/write visibility issue.
450 */
451 bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0);
452 if ((bp->b_flags & B_CACHE) == 0)
453 vfs_bio_clrbuf(bp);
454 } else if (base_offset >= ip->ino_data.size) {
455 /*
456 * If the base offset of the buffer is beyond the
457 * file EOF, we don't have to issue a read.
458 */
459 bp = getblk(ap->a_vp, base_offset,
460 blksize, GETBLK_BHEAVY, 0);
461 vfs_bio_clrbuf(bp);
462 } else {
463 /*
464 * Partial overwrite, read in any missing bits then
465 * replace the portion being written.
466 */
467 error = bread(ap->a_vp, base_offset, blksize, &bp);
468 if (error == 0)
469 bheavy(bp);
470 }
471 if (error == 0) {
472 error = uiomove((char *)bp->b_data + offset,
473 n, uio);
474 }
475
476 /*
477 * If we screwed up we have to undo any VM size changes we
478 * made.
479 */
480 if (error) {
481 brelse(bp);
482 if (fixsize) {
483 vtruncbuf(ap->a_vp, ip->ino_data.size,
484 hammer_blocksize(ip->ino_data.size));
485 }
486 break;
487 }
488 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
489 if (ip->ino_data.size < uio->uio_offset) {
490 ip->ino_data.size = uio->uio_offset;
491 flags = HAMMER_INODE_DDIRTY;
492 vnode_pager_setsize(ap->a_vp, ip->ino_data.size);
493 } else {
494 flags = 0;
495 }
496 ip->ino_data.mtime = trans.time;
497 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS;
498 hammer_modify_inode(ip, flags);
499
500 /*
501 * Final buffer disposition.
502 */
503 bp->b_flags |= B_AGE;
504 if (ap->a_ioflag & IO_SYNC) {
505 bwrite(bp);
506 } else if (ap->a_ioflag & IO_DIRECT) {
507 bawrite(bp);
508 } else {
509 bdwrite(bp);
510 }
511 }
512 hammer_done_transaction(&trans);
513 return (error);
514 }
515
516 /*
517 * hammer_vop_access { vp, mode, cred }
518 */
519 static
520 int
521 hammer_vop_access(struct vop_access_args *ap)
522 {
523 struct hammer_inode *ip = VTOI(ap->a_vp);
524 uid_t uid;
525 gid_t gid;
526 int error;
527
528 uid = hammer_to_unix_xid(&ip->ino_data.uid);
529 gid = hammer_to_unix_xid(&ip->ino_data.gid);
530
531 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
532 ip->ino_data.uflags);
533 return (error);
534 }
535
536 /*
537 * hammer_vop_advlock { vp, id, op, fl, flags }
538 */
539 static
540 int
541 hammer_vop_advlock(struct vop_advlock_args *ap)
542 {
543 hammer_inode_t ip = VTOI(ap->a_vp);
544
545 return (lf_advlock(ap, &ip->advlock, ip->ino_data.size));
546 }
547
548 /*
549 * hammer_vop_close { vp, fflag }
550 */
551 static
552 int
553 hammer_vop_close(struct vop_close_args *ap)
554 {
555 hammer_inode_t ip = VTOI(ap->a_vp);
556
557 if ((ip->flags | ip->sync_flags) & HAMMER_INODE_MODMASK)
558 hammer_inode_waitreclaims(ip->hmp);
559 return (vop_stdclose(ap));
560 }
561
562 /*
563 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
564 *
565 * The operating system has already ensured that the directory entry
566 * does not exist and done all appropriate namespace locking.
567 */
568 static
569 int
570 hammer_vop_ncreate(struct vop_ncreate_args *ap)
571 {
572 struct hammer_transaction trans;
573 struct hammer_inode *dip;
574 struct hammer_inode *nip;
575 struct nchandle *nch;
576 int error;
577
578 nch = ap->a_nch;
579 dip = VTOI(ap->a_dvp);
580
581 if (dip->flags & HAMMER_INODE_RO)
582 return (EROFS);
583 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0)
584 return (error);
585
586 /*
587 * Create a transaction to cover the operations we perform.
588 */
589 hammer_start_transaction(&trans, dip->hmp);
590
591 /*
592 * Create a new filesystem object of the requested type. The
593 * returned inode will be referenced and shared-locked to prevent
594 * it from being moved to the flusher.
595 */
596
597 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
598 dip, NULL, &nip);
599 if (error) {
600 hkprintf("hammer_create_inode error %d\n", error);
601 hammer_done_transaction(&trans);
602 *ap->a_vpp = NULL;
603 return (error);
604 }
605
606 /*
607 * Add the new filesystem object to the directory. This will also
608 * bump the inode's link count.
609 */
610 error = hammer_ip_add_directory(&trans, dip,
611 nch->ncp->nc_name, nch->ncp->nc_nlen,
612 nip);
613 if (error)
614 hkprintf("hammer_ip_add_directory error %d\n", error);
615
616 /*
617 * Finish up.
618 */
619 if (error) {
620 hammer_rel_inode(nip, 0);
621 hammer_done_transaction(&trans);
622 *ap->a_vpp = NULL;
623 } else {
624 error = hammer_get_vnode(nip, ap->a_vpp);
625 hammer_done_transaction(&trans);
626 hammer_rel_inode(nip, 0);
627 if (error == 0) {
628 cache_setunresolved(ap->a_nch);
629 cache_setvp(ap->a_nch, *ap->a_vpp);
630 }
631 }
632 return (error);
633 }
634
635 /*
636 * hammer_vop_getattr { vp, vap }
637 *
638 * Retrieve an inode's attribute information. When accessing inodes
639 * historically we fake the atime field to ensure consistent results.
640 * The atime field is stored in the B-Tree element and allowed to be
641 * updated without cycling the element.
642 */
643 static
644 int
645 hammer_vop_getattr(struct vop_getattr_args *ap)
646 {
647 struct hammer_inode *ip = VTOI(ap->a_vp);
648 struct vattr *vap = ap->a_vap;
649
650 /*
651 * We want the fsid to be different when accessing a filesystem
652 * with different as-of's so programs like diff don't think
653 * the files are the same.
654 *
655 * We also want the fsid to be the same when comparing snapshots,
656 * or when comparing mirrors (which might be backed by different
657 * physical devices). HAMMER fsids are based on the PFS's
658 * shared_uuid field.
659 *
660 * XXX there is a chance of collision here. The va_fsid reported
661 * by stat is different from the more involved fsid used in the
662 * mount structure.
663 */
664 vap->va_fsid = ip->pfsm->fsid_udev ^ (u_int32_t)ip->obj_asof ^
665 (u_int32_t)(ip->obj_asof >> 32);
666
667 vap->va_fileid = ip->ino_leaf.base.obj_id;
668 vap->va_mode = ip->ino_data.mode;
669 vap->va_nlink = ip->ino_data.nlinks;
670 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
671 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
672 vap->va_rmajor = 0;
673 vap->va_rminor = 0;
674 vap->va_size = ip->ino_data.size;
675
676 /*
677 * We must provide a consistent atime and mtime for snapshots
678 * so people can do a 'tar cf - ... | md5' on them and get
679 * consistent results.
680 */
681 if (ip->flags & HAMMER_INODE_RO) {
682 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime);
683 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime);
684 } else {
685 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime);
686 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime);
687 }
688 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
689 vap->va_flags = ip->ino_data.uflags;
690 vap->va_gen = 1; /* hammer inums are unique for all time */
691 vap->va_blocksize = HAMMER_BUFSIZE;
692 if (ip->ino_data.size >= HAMMER_XDEMARC) {
693 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) &
694 ~HAMMER_XBUFMASK64;
695 } else if (ip->ino_data.size > HAMMER_BUFSIZE / 2) {
696 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) &
697 ~HAMMER_BUFMASK64;
698 } else {
699 vap->va_bytes = (ip->ino_data.size + 15) & ~15;
700 }
701 vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type);
702 vap->va_filerev = 0; /* XXX */
703 /* mtime uniquely identifies any adjustments made to the file XXX */
704 vap->va_fsmid = ip->ino_data.mtime;
705 vap->va_uid_uuid = ip->ino_data.uid;
706 vap->va_gid_uuid = ip->ino_data.gid;
707 vap->va_fsid_uuid = ip->hmp->fsid;
708 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
709 VA_FSID_UUID_VALID;
710
711 switch (ip->ino_data.obj_type) {
712 case HAMMER_OBJTYPE_CDEV:
713 case HAMMER_OBJTYPE_BDEV:
714 vap->va_rmajor = ip->ino_data.rmajor;
715 vap->va_rminor = ip->ino_data.rminor;
716 break;
717 default:
718 break;
719 }
720 return(0);
721 }
722
723 /*
724 * hammer_vop_nresolve { nch, dvp, cred }
725 *
726 * Locate the requested directory entry.
727 */
728 static
729 int
730 hammer_vop_nresolve(struct vop_nresolve_args *ap)
731 {
732 struct hammer_transaction trans;
733 struct namecache *ncp;
734 hammer_inode_t dip;
735 hammer_inode_t ip;
736 hammer_tid_t asof;
737 struct hammer_cursor cursor;
738 struct vnode *vp;
739 int64_t namekey;
740 int error;
741 int i;
742 int nlen;
743 int flags;
744 int ispfs;
745 int64_t obj_id;
746 u_int32_t localization;
747
748 /*
749 * Misc initialization, plus handle as-of name extensions. Look for
750 * the '@@' extension. Note that as-of files and directories cannot
751 * be modified.
752 */
753 dip = VTOI(ap->a_dvp);
754 ncp = ap->a_nch->ncp;
755 asof = dip->obj_asof;
756 nlen = ncp->nc_nlen;
757 flags = dip->flags & HAMMER_INODE_RO;
758 ispfs = 0;
759
760 hammer_simple_transaction(&trans, dip->hmp);
761
762 for (i = 0; i < nlen; ++i) {
763 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
764 asof = hammer_str_to_tid(ncp->nc_name + i + 2,
765 &ispfs, &localization);
766 if (asof != HAMMER_MAX_TID)
767 flags |= HAMMER_INODE_RO;
768 break;
769 }
770 }
771 nlen = i;
772
773 /*
774 * If this is a PFS softlink we dive into the PFS
775 */
776 if (ispfs && nlen == 0) {
777 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT,
778 asof, localization,
779 flags, &error);
780 if (error == 0) {
781 error = hammer_get_vnode(ip, &vp);
782 hammer_rel_inode(ip, 0);
783 } else {
784 vp = NULL;
785 }
786 if (error == 0) {
787 vn_unlock(vp);
788 cache_setvp(ap->a_nch, vp);
789 vrele(vp);
790 }
791 goto done;
792 }
793
794 /*
795 * If there is no path component the time extension is relative to
796 * dip.
797 */
798 if (nlen == 0) {
799 ip = hammer_get_inode(&trans, dip, dip->obj_id,
800 asof, dip->obj_localization,
801 flags, &error);
802 if (error == 0) {
803 error = hammer_get_vnode(ip, &vp);
804 hammer_rel_inode(ip, 0);
805 } else {
806 vp = NULL;
807 }
808 if (error == 0) {
809 vn_unlock(vp);
810 cache_setvp(ap->a_nch, vp);
811 vrele(vp);
812 }
813 goto done;
814 }
815
816 /*
817 * Calculate the namekey and setup the key range for the scan. This
818 * works kinda like a chained hash table where the lower 32 bits
819 * of the namekey synthesize the chain.
820 *
821 * The key range is inclusive of both key_beg and key_end.
822 */
823 namekey = hammer_directory_namekey(ncp->nc_name, nlen);
824
825 error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip);
826 cursor.key_beg.localization = dip->obj_localization +
827 HAMMER_LOCALIZE_MISC;
828 cursor.key_beg.obj_id = dip->obj_id;
829 cursor.key_beg.key = namekey;
830 cursor.key_beg.create_tid = 0;
831 cursor.key_beg.delete_tid = 0;
832 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
833 cursor.key_beg.obj_type = 0;
834
835 cursor.key_end = cursor.key_beg;
836 cursor.key_end.key |= 0xFFFFFFFFULL;
837 cursor.asof = asof;
838 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
839
840 /*
841 * Scan all matching records (the chain), locate the one matching
842 * the requested path component.
843 *
844 * The hammer_ip_*() functions merge in-memory records with on-disk
845 * records for the purposes of the search.
846 */
847 obj_id = 0;
848 localization = HAMMER_DEF_LOCALIZATION;
849
850 if (error == 0) {
851 error = hammer_ip_first(&cursor);
852 while (error == 0) {
853 error = hammer_ip_resolve_data(&cursor);
854 if (error)
855 break;
856 if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF &&
857 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
858 obj_id = cursor.data->entry.obj_id;
859 localization = cursor.data->entry.localization;
860 break;
861 }
862 error = hammer_ip_next(&cursor);
863 }
864 }
865 hammer_done_cursor(&cursor);
866 if (error == 0) {
867 ip = hammer_get_inode(&trans, dip, obj_id,
868 asof, localization,
869 flags, &error);
870 if (error == 0) {
871 error = hammer_get_vnode(ip, &vp);
872 hammer_rel_inode(ip, 0);
873 } else {
874 vp = NULL;
875 }
876 if (error == 0) {
877 vn_unlock(vp);
878 cache_setvp(ap->a_nch, vp);
879 vrele(vp);
880 }
881 } else if (error == ENOENT) {
882 cache_setvp(ap->a_nch, NULL);
883 }
884 done:
885 hammer_done_transaction(&trans);
886 return (error);
887 }
888
889 /*
890 * hammer_vop_nlookupdotdot { dvp, vpp, cred }
891 *
892 * Locate the parent directory of a directory vnode.
893 *
894 * dvp is referenced but not locked. *vpp must be returned referenced and
895 * locked. A parent_obj_id of 0 does not necessarily indicate that we are
896 * at the root, instead it could indicate that the directory we were in was
897 * removed.
898 *
899 * NOTE: as-of sequences are not linked into the directory structure. If
900 * we are at the root with a different asof then the mount point, reload
901 * the same directory with the mount point's asof. I'm not sure what this
902 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not
903 * get confused, but it hasn't been tested.
904 */
905 static
906 int
907 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
908 {
909 struct hammer_transaction trans;
910 struct hammer_inode *dip;
911 struct hammer_inode *ip;
912 int64_t parent_obj_id;
913 u_int32_t parent_obj_localization;
914 hammer_tid_t asof;
915 int error;
916
917 dip = VTOI(ap->a_dvp);
918 asof = dip->obj_asof;
919
920 /*
921 * Whos are parent? This could be the root of a pseudo-filesystem
922 * whos parent is in another localization domain.
923 */
924 parent_obj_id = dip->ino_data.parent_obj_id;
925 if (dip->obj_id == HAMMER_OBJID_ROOT)
926 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization;
927 else
928 parent_obj_localization = dip->obj_localization;
929
930 if (parent_obj_id == 0) {
931 if (dip->obj_id == HAMMER_OBJID_ROOT &&
932 asof != dip->hmp->asof) {
933 parent_obj_id = dip->obj_id;
934 asof = dip->hmp->asof;
935 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK);
936 ksnprintf(*ap->a_fakename, 19, "0x%016llx",
937 dip->obj_asof);
938 } else {
939 *ap->a_vpp = NULL;
940 return ENOENT;
941 }
942 }
943
944 hammer_simple_transaction(&trans, dip->hmp);
945
946 ip = hammer_get_inode(&trans, dip, parent_obj_id,
947 asof, parent_obj_localization,
948 dip->flags, &error);
949 if (ip) {
950 error = hammer_get_vnode(ip, ap->a_vpp);
951 hammer_rel_inode(ip, 0);
952 } else {
953 *ap->a_vpp = NULL;
954 }
955 hammer_done_transaction(&trans);
956 return (error);
957 }
958
959 /*
960 * hammer_vop_nlink { nch, dvp, vp, cred }
961 */
962 static
963 int
964 hammer_vop_nlink(struct vop_nlink_args *ap)
965 {
966 struct hammer_transaction trans;
967 struct hammer_inode *dip;
968 struct hammer_inode *ip;
969 struct nchandle *nch;
970 int error;
971
972 nch = ap->a_nch;
973 dip = VTOI(ap->a_dvp);
974 ip = VTOI(ap->a_vp);
975
976 if (dip->flags & HAMMER_INODE_RO)
977 return (EROFS);
978 if (ip->flags & HAMMER_INODE_RO)
979 return (EROFS);
980 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0)
981 return (error);
982
983 /*
984 * Create a transaction to cover the operations we perform.
985 */
986 hammer_start_transaction(&trans, dip->hmp);
987
988 /*
989 * Add the filesystem object to the directory. Note that neither
990 * dip nor ip are referenced or locked, but their vnodes are
991 * referenced. This function will bump the inode's link count.
992 */
993 error = hammer_ip_add_directory(&trans, dip,
994 nch->ncp->nc_name, nch->ncp->nc_nlen,
995 ip);
996
997 /*
998 * Finish up.
999 */
1000 if (error == 0) {
1001 cache_setunresolved(nch);
1002 cache_setvp(nch, ap->a_vp);
1003 }
1004 hammer_done_transaction(&trans);
1005 return (error);
1006 }
1007
1008 /*
1009 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
1010 *
1011 * The operating system has already ensured that the directory entry
1012 * does not exist and done all appropriate namespace locking.
1013 */
1014 static
1015 int
1016 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
1017 {
1018 struct hammer_transaction trans;
1019 struct hammer_inode *dip;
1020 struct hammer_inode *nip;
1021 struct nchandle *nch;
1022 int error;
1023
1024 nch = ap->a_nch;
1025 dip = VTOI(ap->a_dvp);
1026
1027 if (dip->flags & HAMMER_INODE_RO)
1028 return (EROFS);
1029 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0)
1030 return (error);
1031
1032 /*
1033 * Create a transaction to cover the operations we perform.
1034 */
1035 hammer_start_transaction(&trans, dip->hmp);
1036
1037 /*
1038 * Create a new filesystem object of the requested type. The
1039 * returned inode will be referenced but not locked.
1040 */
1041 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1042 dip, NULL, &nip);
1043 if (error) {
1044 hkprintf("hammer_mkdir error %d\n", error);
1045 hammer_done_transaction(&trans);
1046 *ap->a_vpp = NULL;
1047 return (error);
1048 }
1049 /*
1050 * Add the new filesystem object to the directory. This will also
1051 * bump the inode's link count.
1052 */
1053 error = hammer_ip_add_directory(&trans, dip,
1054 nch->ncp->nc_name, nch->ncp->nc_nlen,
1055 nip);
1056 if (error)
1057 hkprintf("hammer_mkdir (add) error %d\n", error);
1058
1059 /*
1060 * Finish up.
1061 */
1062 if (error) {
1063 hammer_rel_inode(nip, 0);
1064 *ap->a_vpp = NULL;
1065 } else {
1066 error = hammer_get_vnode(nip, ap->a_vpp);
1067 hammer_rel_inode(nip, 0);
1068 if (error == 0) {
1069 cache_setunresolved(ap->a_nch);
1070 cache_setvp(ap->a_nch, *ap->a_vpp);
1071 }
1072 }
1073 hammer_done_transaction(&trans);
1074 return (error);
1075 }
1076
1077 /*
1078 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
1079 *
1080 * The operating system has already ensured that the directory entry
1081 * does not exist and done all appropriate namespace locking.
1082 */
1083 static
1084 int
1085 hammer_vop_nmknod(struct vop_nmknod_args *ap)
1086 {
1087 struct hammer_transaction trans;
1088 struct hammer_inode *dip;
1089 struct hammer_inode *nip;
1090 struct nchandle *nch;
1091 int error;
1092
1093 nch = ap->a_nch;
1094 dip = VTOI(ap->a_dvp);
1095
1096 if (dip->flags & HAMMER_INODE_RO)
1097 return (EROFS);
1098 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0)
1099 return (error);
1100
1101 /*
1102 * Create a transaction to cover the operations we perform.
1103 */
1104 hammer_start_transaction(&trans, dip->hmp);
1105
1106 /*
1107 * Create a new filesystem object of the requested type. The
1108 * returned inode will be referenced but not locked.
1109 *
1110 * If mknod specifies a directory a pseudo-fs is created.
1111 */
1112 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1113 dip, NULL, &nip);
1114 if (error) {
1115 hammer_done_transaction(&trans);
1116 *ap->a_vpp = NULL;
1117 return (error);
1118 }
1119
1120 /*
1121 * Add the new filesystem object to the directory. This will also
1122 * bump the inode's link count.
1123 */
1124 error = hammer_ip_add_directory(&trans, dip,
1125 nch->ncp->nc_name, nch->ncp->nc_nlen,
1126 nip);
1127
1128 /*
1129 * Finish up.
1130 */
1131 if (error) {
1132 hammer_rel_inode(nip, 0);
1133 *ap->a_vpp = NULL;
1134 } else {
1135 error = hammer_get_vnode(nip, ap->a_vpp);
1136 hammer_rel_inode(nip, 0);
1137 if (error == 0) {
1138 cache_setunresolved(ap->a_nch);
1139 cache_setvp(ap->a_nch, *ap->a_vpp);
1140 }
1141 }
1142 hammer_done_transaction(&trans);
1143 return (error);
1144 }
1145
1146 /*
1147 * hammer_vop_open { vp, mode, cred, fp }
1148 */
1149 static
1150 int
1151 hammer_vop_open(struct vop_open_args *ap)
1152 {
1153 hammer_inode_t ip;
1154
1155 ip = VTOI(ap->a_vp);
1156
1157 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO))
1158 return (EROFS);
1159 return(vop_stdopen(ap));
1160 }
1161
1162 /*
1163 * hammer_vop_pathconf { vp, name, retval }
1164 */
1165 static
1166 int
1167 hammer_vop_pathconf(struct vop_pathconf_args *ap)
1168 {
1169 return EOPNOTSUPP;
1170 }
1171
1172 /*
1173 * hammer_vop_print { vp }
1174 */
1175 static
1176 int
1177 hammer_vop_print(struct vop_print_args *ap)
1178 {
1179 return EOPNOTSUPP;
1180 }
1181
1182 /*
1183 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
1184 */
1185 static
1186 int
1187 hammer_vop_readdir(struct vop_readdir_args *ap)
1188 {
1189 struct hammer_transaction trans;
1190 struct hammer_cursor cursor;
1191 struct hammer_inode *ip;
1192 struct uio *uio;
1193 hammer_base_elm_t base;
1194 int error;
1195 int cookie_index;
1196 int ncookies;
1197 off_t *cookies;
1198 off_t saveoff;
1199 int r;
1200 int dtype;
1201
1202 ip = VTOI(ap->a_vp);
1203 uio = ap->a_uio;
1204 saveoff = uio->uio_offset;
1205
1206 if (ap->a_ncookies) {
1207 ncookies = uio->uio_resid / 16 + 1;
1208 if (ncookies > 1024)
1209 ncookies = 1024;
1210 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
1211 cookie_index = 0;
1212 } else {
1213 ncookies = -1;
1214 cookies = NULL;
1215 cookie_index = 0;
1216 }
1217
1218 hammer_simple_transaction(&trans, ip->hmp);
1219
1220 /*
1221 * Handle artificial entries
1222 */
1223 error = 0;
1224 if (saveoff == 0) {
1225 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
1226 if (r)
1227 goto done;
1228 if (cookies)
1229 cookies[cookie_index] = saveoff;
1230 ++saveoff;
1231 ++cookie_index;
1232 if (cookie_index == ncookies)
1233 goto done;
1234 }
1235 if (saveoff == 1) {
1236 if (ip->ino_data.parent_obj_id) {
1237 r = vop_write_dirent(&error, uio,
1238 ip->ino_data.parent_obj_id,
1239 DT_DIR, 2, "..");
1240 } else {
1241 r = vop_write_dirent(&error, uio,
1242 ip->obj_id, DT_DIR, 2, "..");
1243 }
1244 if (r)
1245 goto done;
1246 if (cookies)
1247 cookies[cookie_index] = saveoff;
1248 ++saveoff;
1249 ++cookie_index;
1250 if (cookie_index == ncookies)
1251 goto done;
1252 }
1253
1254 /*
1255 * Key range (begin and end inclusive) to scan. Directory keys
1256 * directly translate to a 64 bit 'seek' position.
1257 */
1258 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1259 cursor.key_beg.localization = ip->obj_localization +
1260 HAMMER_LOCALIZE_MISC;
1261 cursor.key_beg.obj_id = ip->obj_id;
1262 cursor.key_beg.create_tid = 0;
1263 cursor.key_beg.delete_tid = 0;
1264 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1265 cursor.key_beg.obj_type = 0;
1266 cursor.key_beg.key = saveoff;
1267
1268 cursor.key_end = cursor.key_beg;
1269 cursor.key_end.key = HAMMER_MAX_KEY;
1270 cursor.asof = ip->obj_asof;
1271 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1272
1273 error = hammer_ip_first(&cursor);
1274
1275 while (error == 0) {
1276 error = hammer_ip_resolve_data(&cursor);
1277 if (error)
1278 break;
1279 base = &cursor.leaf->base;
1280 saveoff = base->key;
1281 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF);
1282
1283 if (base->obj_id != ip->obj_id)
1284 panic("readdir: bad record at %p", cursor.node);
1285
1286 /*
1287 * Convert pseudo-filesystems into softlinks
1288 */
1289 dtype = hammer_get_dtype(cursor.leaf->base.obj_type);
1290 r = vop_write_dirent(
1291 &error, uio, cursor.data->entry.obj_id,
1292 dtype,
1293 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF ,
1294 (void *)cursor.data->entry.name);
1295 if (r)
1296 break;
1297 ++saveoff;
1298 if (cookies)
1299 cookies[cookie_index] = base->key;
1300 ++cookie_index;
1301 if (cookie_index == ncookies)
1302 break;
1303 error = hammer_ip_next(&cursor);
1304 }
1305 hammer_done_cursor(&cursor);
1306
1307 done:
1308 hammer_done_transaction(&trans);
1309
1310 if (ap->a_eofflag)
1311 *ap->a_eofflag = (error == ENOENT);
1312 uio->uio_offset = saveoff;
1313 if (error && cookie_index == 0) {
1314 if (error == ENOENT)
1315 error = 0;
1316 if (cookies) {
1317 kfree(cookies, M_TEMP);
1318 *ap->a_ncookies = 0;
1319 *ap->a_cookies = NULL;
1320 }
1321 } else {
1322 if (error == ENOENT)
1323 error = 0;
1324 if (cookies) {
1325 *ap->a_ncookies = cookie_index;
1326 *ap->a_cookies = cookies;
1327 }
1328 }
1329 return(error);
1330 }
1331
1332 /*
1333 * hammer_vop_readlink { vp, uio, cred }
1334 */
1335 static
1336 int
1337 hammer_vop_readlink(struct vop_readlink_args *ap)
1338 {
1339 struct hammer_transaction trans;
1340 struct hammer_cursor cursor;
1341 struct hammer_inode *ip;
1342 char buf[32];
1343 u_int32_t localization;
1344 hammer_pseudofs_inmem_t pfsm;
1345 int error;
1346
1347 ip = VTOI(ap->a_vp);
1348
1349 /*
1350 * Special softlink for PFS access, created by hammer pfs-create
1351 */
1352
1353 if (ip->obj_id == HAMMER_OBJID_ROOT && ip->obj_localization &&
1354 ip->obj_asof == HAMMER_MAX_TID) {
1355 ksnprintf(buf, sizeof(buf), "@@0x%016llx:0x%04x",
1356 ip->pfsm->pfsd.sync_end_tid,
1357 ip->obj_localization >> 16);
1358 error = uiomove(buf, strlen(buf), ap->a_uio);
1359 return(error);
1360 }
1361
1362 /*
1363 * Shortcut if the symlink data was stuffed into ino_data.
1364 *
1365 * Also expand special @@PFSxxxxx softlinks.
1366 */
1367 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) {
1368 char *ptr;
1369 int bytes;
1370
1371 ptr = ip->ino_data.ext.symlink;
1372 bytes = (int)ip->ino_data.size;
1373 if (bytes == 10 && strncmp(ptr, "@@PFS", 5) == 0) {
1374 hammer_simple_transaction(&trans, ip->hmp);
1375 bcopy(ptr + 5, buf, 5);
1376 buf[5] = 0;
1377 localization = strtoul(buf, NULL, 10) << 16;
1378 pfsm = hammer_load_pseudofs(&trans, localization,
1379 &error);
1380 if (error == 0) {
1381 ksnprintf(buf, sizeof(buf),
1382 "@@0x%016llx:%05d",
1383 pfsm->pfsd.sync_end_tid,
1384 localization >> 16);
1385 ptr = buf;
1386 bytes = strlen(buf);
1387 }
1388 if (pfsm)
1389 hammer_rel_pseudofs(trans.hmp, pfsm);
1390 hammer_done_transaction(&trans);
1391 }
1392 error = uiomove(ptr, bytes, ap->a_uio);
1393 return(error);
1394 }
1395
1396 /*
1397 * Long version
1398 */
1399 hammer_simple_transaction(&trans, ip->hmp);
1400 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1401
1402 /*
1403 * Key range (begin and end inclusive) to scan. Directory keys
1404 * directly translate to a 64 bit 'seek' position.
1405 */
1406 cursor.key_beg.localization = ip->obj_localization +
1407 HAMMER_LOCALIZE_MISC;
1408 cursor.key_beg.obj_id = ip->obj_id;
1409 cursor.key_beg.create_tid = 0;
1410 cursor.key_beg.delete_tid = 0;
1411 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1412 cursor.key_beg.obj_type = 0;
1413 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1414 cursor.asof = ip->obj_asof;
1415 cursor.flags |= HAMMER_CURSOR_ASOF;
1416
1417 error = hammer_ip_lookup(&cursor);
1418 if (error == 0) {
1419 error = hammer_ip_resolve_data(&cursor);
1420 if (error == 0) {
1421 KKASSERT(cursor.leaf->data_len >=
1422 HAMMER_SYMLINK_NAME_OFF);
1423 error = uiomove(cursor.data->symlink.name,
1424 cursor.leaf->data_len -
1425 HAMMER_SYMLINK_NAME_OFF,
1426 ap->a_uio);
1427 }
1428 }
1429 hammer_done_cursor(&cursor);
1430 hammer_done_transaction(&trans);
1431 return(error);
1432 }
1433
1434 /*
1435 * hammer_vop_nremove { nch, dvp, cred }
1436 */
1437 static
1438 int
1439 hammer_vop_nremove(struct vop_nremove_args *ap)
1440 {
1441 struct hammer_transaction trans;
1442 struct hammer_inode *dip;
1443 int error;
1444
1445 dip = VTOI(ap->a_dvp);
1446
1447 if (hammer_nohistory(dip) == 0 &&
1448 (error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_REMOVE)) != 0) {
1449 return (error);
1450 }
1451
1452 hammer_start_transaction(&trans, dip->hmp);
1453 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0);
1454 hammer_done_transaction(&trans);
1455
1456 return (error);
1457 }
1458
1459 /*
1460 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1461 */
1462 static
1463 int
1464 hammer_vop_nrename(struct vop_nrename_args *ap)
1465 {
1466 struct hammer_transaction trans;
1467 struct namecache *fncp;
1468 struct namecache *tncp;
1469 struct hammer_inode *fdip;
1470 struct hammer_inode *tdip;
1471 struct hammer_inode *ip;
1472 struct hammer_cursor cursor;
1473 int64_t namekey;
1474 int nlen, error;
1475
1476 fdip = VTOI(ap->a_fdvp);
1477 tdip = VTOI(ap->a_tdvp);
1478 fncp = ap->a_fnch->ncp;
1479 tncp = ap->a_tnch->ncp;
1480 ip = VTOI(fncp->nc_vp);
1481 KKASSERT(ip != NULL);
1482
1483 if (fdip->flags & HAMMER_INODE_RO)
1484 return (EROFS);
1485 if (tdip->flags & HAMMER_INODE_RO)
1486 return (EROFS);
1487 if (ip->flags & HAMMER_INODE_RO)
1488 return (EROFS);
1489 if ((error = hammer_checkspace(fdip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0)
1490 return (error);
1491
1492 hammer_start_transaction(&trans, fdip->hmp);
1493
1494 /*
1495 * Remove tncp from the target directory and then link ip as
1496 * tncp. XXX pass trans to dounlink
1497 *
1498 * Force the inode sync-time to match the transaction so it is
1499 * in-sync with the creation of the target directory entry.
1500 */
1501 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp, ap->a_cred, 0);
1502 if (error == 0 || error == ENOENT) {
1503 error = hammer_ip_add_directory(&trans, tdip,
1504 tncp->nc_name, tncp->nc_nlen,
1505 ip);
1506 if (error == 0) {
1507 ip->ino_data.parent_obj_id = tdip->obj_id;
1508 hammer_modify_inode(ip, HAMMER_INODE_DDIRTY);
1509 }
1510 }
1511 if (error)
1512 goto failed; /* XXX */
1513
1514 /*
1515 * Locate the record in the originating directory and remove it.
1516 *
1517 * Calculate the namekey and setup the key range for the scan. This
1518 * works kinda like a chained hash table where the lower 32 bits
1519 * of the namekey synthesize the chain.
1520 *
1521 * The key range is inclusive of both key_beg and key_end.
1522 */
1523 namekey = hammer_directory_namekey(fncp->nc_name, fncp->nc_nlen);
1524 retry:
1525 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip);
1526 cursor.key_beg.localization = fdip->obj_localization +
1527 HAMMER_LOCALIZE_MISC;
1528 cursor.key_beg.obj_id = fdip->obj_id;
1529 cursor.key_beg.key = namekey;
1530 cursor.key_beg.create_tid = 0;
1531 cursor.key_beg.delete_tid = 0;
1532 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1533 cursor.key_beg.obj_type = 0;
1534
1535 cursor.key_end = cursor.key_beg;
1536 cursor.key_end.key |= 0xFFFFFFFFULL;
1537 cursor.asof = fdip->obj_asof;
1538 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1539
1540 /*
1541 * Scan all matching records (the chain), locate the one matching
1542 * the requested path component.
1543 *
1544 * The hammer_ip_*() functions merge in-memory records with on-disk
1545 * records for the purposes of the search.
1546 */
1547 error = hammer_ip_first(&cursor);
1548 while (error == 0) {
1549 if (hammer_ip_resolve_data(&cursor) != 0)
1550 break;
1551 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
1552 KKASSERT(nlen > 0);
1553 if (fncp->nc_nlen == nlen &&
1554 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) {
1555 break;
1556 }
1557 error = hammer_ip_next(&cursor);
1558 }
1559
1560 /*
1561 * If all is ok we have to get the inode so we can adjust nlinks.
1562 *
1563 * WARNING: hammer_ip_del_directory() may have to terminate the
1564 * cursor to avoid a recursion. It's ok to call hammer_done_cursor()
1565 * twice.
1566 */
1567 if (error == 0)
1568 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
1569
1570 /*
1571 * XXX A deadlock here will break rename's atomicy for the purposes
1572 * of crash recovery.
1573 */
1574 if (error == EDEADLK) {
1575 hammer_done_cursor(&cursor);
1576 goto retry;
1577 }
1578
1579 /*
1580 * Cleanup and tell the kernel that the rename succeeded.
1581 */
1582 hammer_done_cursor(&cursor);
1583 if (error == 0)
1584 cache_rename(ap->a_fnch, ap->a_tnch);
1585
1586 failed:
1587 hammer_done_transaction(&trans);
1588 return (error);
1589 }
1590
1591 /*
1592 * hammer_vop_nrmdir { nch, dvp, cred }
1593 */
1594 static
1595 int
1596 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
1597 {
1598 struct hammer_transaction trans;
1599 struct hammer_inode *dip;
1600 int error;
1601
1602 dip = VTOI(ap->a_dvp);
1603
1604 if (hammer_nohistory(dip) == 0 &&
1605 (error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_REMOVE)) != 0) {
1606 return (error);
1607 }
1608
1609 hammer_start_transaction(&trans, dip->hmp);
1610 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0);
1611 hammer_done_transaction(&trans);
1612
1613 return (error);
1614 }
1615
1616 /*
1617 * hammer_vop_setattr { vp, vap, cred }
1618 */
1619 static
1620 int
1621 hammer_vop_setattr(struct vop_setattr_args *ap)
1622 {
1623 struct hammer_transaction trans;
1624 struct vattr *vap;
1625 struct hammer_inode *ip;
1626 int modflags;
1627 int error;
1628 int truncating;
1629 int blksize;
1630 int64_t aligned_size;
1631 u_int32_t flags;
1632
1633 vap = ap->a_vap;
1634 ip = ap->a_vp->v_data;
1635 modflags = 0;
1636
1637 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1638 return(EROFS);
1639 if (ip->flags & HAMMER_INODE_RO)
1640 return (EROFS);
1641 if (hammer_nohistory(ip) == 0 &&
1642 (error = hammer_checkspace(ip->hmp, HAMMER_CHECKSPACE_SLOP_REMOVE)) != 0) {
1643 return (error);
1644 }
1645
1646 hammer_start_transaction(&trans, ip->hmp);
1647 error = 0;
1648
1649 if (vap->va_flags != VNOVAL) {
1650 flags = ip->ino_data.uflags;
1651 error = vop_helper_setattr_flags(&flags, vap->va_flags,
1652 hammer_to_unix_xid(&ip->ino_data.uid),
1653 ap->a_cred);
1654 if (error == 0) {
1655 if (ip->ino_data.uflags != flags) {
1656 ip->ino_data.uflags = flags;
1657 modflags |= HAMMER_INODE_DDIRTY;
1658 }
1659 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1660 error = 0;
1661 goto done;
1662 }
1663 }
1664 goto done;
1665 }
1666 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1667 error = EPERM;
1668 goto done;
1669 }
1670 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
1671 mode_t cur_mode = ip->ino_data.mode;
1672 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
1673 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1674 uuid_t uuid_uid;
1675 uuid_t uuid_gid;
1676
1677 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
1678 ap->a_cred,
1679 &cur_uid, &cur_gid, &cur_mode);
1680 if (error == 0) {
1681 hammer_guid_to_uuid(&uuid_uid, cur_uid);
1682 hammer_guid_to_uuid(&uuid_gid, cur_gid);
1683 if (bcmp(&uuid_uid, &ip->ino_data.uid,
1684 sizeof(uuid_uid)) ||
1685 bcmp(&uuid_gid, &ip->ino_data.gid,
1686 sizeof(uuid_gid)) ||
1687 ip->ino_data.mode != cur_mode
1688 ) {
1689 ip->ino_data.uid = uuid_uid;
1690 ip->ino_data.gid = uuid_gid;
1691 ip->ino_data.mode = cur_mode;
1692 }
1693 modflags |= HAMMER_INODE_DDIRTY;
1694 }
1695 }
1696 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) {
1697 switch(ap->a_vp->v_type) {
1698 case VREG:
1699 if (vap->va_size == ip->ino_data.size)
1700 break;
1701 /*
1702 * XXX break atomicy, we can deadlock the backend
1703 * if we do not release the lock. Probably not a
1704 * big deal here.
1705 */
1706 blksize = hammer_blocksize(vap->va_size);
1707 if (vap->va_size < ip->ino_data.size) {
1708 vtruncbuf(ap->a_vp, vap->va_size, blksize);
1709 truncating = 1;
1710 } else {
1711 vnode_pager_setsize(ap->a_vp, vap->va_size);
1712 truncating = 0;
1713 }
1714 ip->ino_data.size = vap->va_size;
1715 modflags |= HAMMER_INODE_DDIRTY;
1716
1717 /*
1718 * on-media truncation is cached in the inode until
1719 * the inode is synchronized.
1720 */
1721 if (truncating) {
1722 hammer_ip_frontend_trunc(ip, vap->va_size);
1723 #ifdef DEBUG_TRUNCATE
1724 if (HammerTruncIp == NULL)
1725 HammerTruncIp = ip;
1726 #endif
1727 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
1728 ip->flags |= HAMMER_INODE_TRUNCATED;
1729 ip->trunc_off = vap->va_size;
1730 #ifdef DEBUG_TRUNCATE
1731 if (ip == HammerTruncIp)
1732 kprintf("truncate1 %016llx\n", ip->trunc_off);
1733 #endif
1734 } else if (ip->trunc_off > vap->va_size) {
1735 ip->trunc_off = vap->va_size;
1736 #ifdef DEBUG_TRUNCATE
1737 if (ip == HammerTruncIp)
1738 kprintf("truncate2 %016llx\n", ip->trunc_off);
1739 #endif
1740 } else {
1741 #ifdef DEBUG_TRUNCATE
1742 if (ip == HammerTruncIp)
1743 kprintf("truncate3 %016llx (ignored)\n", vap->va_size);
1744 #endif
1745 }
1746 }
1747
1748 /*
1749 * If truncating we have to clean out a portion of
1750 * the last block on-disk. We do this in the
1751 * front-end buffer cache.
1752 */
1753 aligned_size = (vap->va_size + (blksize - 1)) &
1754 ~(int64_t)(blksize - 1);
1755 if (truncating && vap->va_size < aligned_size) {
1756 struct buf *bp;
1757 int offset;
1758
1759 aligned_size -= blksize;
1760
1761 offset = (int)vap->va_size & (blksize - 1);
1762 error = bread(ap->a_vp, aligned_size,
1763 blksize, &bp);
1764 hammer_ip_frontend_trunc(ip, aligned_size);
1765 if (error == 0) {
1766 bzero(bp->b_data + offset,
1767 blksize - offset);
1768 bdwrite(bp);
1769 } else {
1770 kprintf("ERROR %d\n", error);
1771 brelse(bp);
1772 }
1773 }
1774 break;
1775 case VDATABASE:
1776 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
1777 ip->flags |= HAMMER_INODE_TRUNCATED;
1778 ip->trunc_off = vap->va_size;
1779 } else if (ip->trunc_off > vap->va_size) {
1780 ip->trunc_off = vap->va_size;
1781 }
1782 hammer_ip_frontend_trunc(ip, vap->va_size);
1783 ip->ino_data.size = vap->va_size;
1784 modflags |= HAMMER_INODE_DDIRTY;
1785 break;
1786 default:
1787 error = EINVAL;
1788 goto done;
1789 }
1790 break;
1791 }
1792 if (vap->va_atime.tv_sec != VNOVAL) {
1793 ip->ino_data.atime =
1794 hammer_timespec_to_time(&vap->va_atime);
1795 modflags |= HAMMER_INODE_ATIME;
1796 }
1797 if (vap->va_mtime.tv_sec != VNOVAL) {
1798 ip->ino_data.mtime =
1799 hammer_timespec_to_time(&vap->va_mtime);
1800 modflags |= HAMMER_INODE_MTIME;
1801 }
1802 if (vap->va_mode != (mode_t)VNOVAL) {
1803 mode_t cur_mode = ip->ino_data.mode;
1804 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
1805 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1806
1807 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
1808 cur_uid, cur_gid, &cur_mode);
1809 if (error == 0 && ip->ino_data.mode != cur_mode) {
1810 ip->ino_data.mode = cur_mode;
1811 modflags |= HAMMER_INODE_DDIRTY;
1812 }
1813 }
1814 done:
1815 if (error == 0)
1816 hammer_modify_inode(ip, modflags);
1817 hammer_done_transaction(&trans);
1818 return (error);
1819 }
1820
1821 /*
1822 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
1823 */
1824 static
1825 int
1826 hammer_vop_nsymlink(struct vop_nsymlink_args *ap)
1827 {
1828 struct hammer_transaction trans;
1829 struct hammer_inode *dip;
1830 struct hammer_inode *nip;
1831 struct nchandle *nch;
1832 hammer_record_t record;
1833 int error;
1834 int bytes;
1835
1836 ap->a_vap->va_type = VLNK;
1837
1838 nch = ap->a_nch;
1839 dip = VTOI(ap->a_dvp);
1840
1841 if (dip->flags & HAMMER_INODE_RO)
1842 return (EROFS);
1843 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0)
1844 return (error);
1845
1846 /*
1847 * Create a transaction to cover the operations we perform.
1848 */
1849 hammer_start_transaction(&trans, dip->hmp);
1850
1851 /*
1852 * Create a new filesystem object of the requested type. The
1853 * returned inode will be referenced but not locked.
1854 */
1855
1856 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1857 dip, NULL, &nip);
1858 if (error) {
1859 hammer_done_transaction(&trans);
1860 *ap->a_vpp = NULL;
1861 return (error);
1862 }
1863
1864 /*
1865 * Add a record representing the symlink. symlink stores the link
1866 * as pure data, not a string, and is no \0 terminated.
1867 */
1868 if (error == 0) {
1869 bytes = strlen(ap->a_target);
1870
1871 if (bytes <= HAMMER_INODE_BASESYMLEN) {
1872 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes);
1873 } else {
1874 record = hammer_alloc_mem_record(nip, bytes);
1875 record->type = HAMMER_MEM_RECORD_GENERAL;
1876
1877 record->leaf.base.localization = nip->obj_localization +
1878 HAMMER_LOCALIZE_MISC;
1879 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK;
1880 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX;
1881 record->leaf.data_len = bytes;
1882 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0);
1883 bcopy(ap->a_target, record->data->symlink.name, bytes);
1884 error = hammer_ip_add_record(&trans, record);
1885 }
1886
1887 /*
1888 * Set the file size to the length of the link.
1889 */
1890 if (error == 0) {
1891 nip->ino_data.size = bytes;
1892 hammer_modify_inode(nip, HAMMER_INODE_DDIRTY);
1893 }
1894 }
1895 if (error == 0)
1896 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name,
1897 nch->ncp->nc_nlen, nip);
1898
1899 /*
1900 * Finish up.
1901 */
1902 if (error) {
1903 hammer_rel_inode(nip, 0);
1904 *ap->a_vpp = NULL;
1905 } else {
1906 error = hammer_get_vnode(nip, ap->a_vpp);
1907 hammer_rel_inode(nip, 0);
1908 if (error == 0) {
1909 cache_setunresolved(ap->a_nch);
1910 cache_setvp(ap->a_nch, *ap->a_vpp);
1911 }
1912 }
1913 hammer_done_transaction(&trans);
1914 return (error);
1915 }
1916
1917 /*
1918 * hammer_vop_nwhiteout { nch, dvp, cred, flags }
1919 */
1920 static
1921 int
1922 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap)
1923 {
1924 struct hammer_transaction trans;
1925 struct hammer_inode *dip;
1926 int error;
1927
1928 dip = VTOI(ap->a_dvp);
1929
1930 if (hammer_nohistory(dip) == 0 &&
1931 (error = hammer_checkspace(dip->hmp, HAMMER_CHECKSPACE_SLOP_CREATE)) != 0) {
1932 return (error);
1933 }
1934
1935 hammer_start_transaction(&trans, dip->hmp);
1936 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp,
1937 ap->a_cred, ap->a_flags);
1938 hammer_done_transaction(&trans);
1939
1940 return (error);
1941 }
1942
1943 /*
1944 * hammer_vop_ioctl { vp, command, data, fflag, cred }
1945 */
1946 static
1947 int
1948 hammer_vop_ioctl(struct vop_ioctl_args *ap)
1949 {
1950 struct hammer_inode *ip = ap->a_vp->v_data;
1951
1952 return(hammer_ioctl(ip, ap->a_command, ap->a_data,
1953 ap->a_fflag, ap->a_cred));
1954 }
1955
1956 static
1957 int
1958 hammer_vop_mountctl(struct vop_mountctl_args *ap)
1959 {
1960 struct mount *mp;
1961 int error;
1962
1963 mp = ap->a_head.a_ops->head.vv_mount;
1964
1965 switch(ap->a_op) {
1966 case MOUNTCTL_SET_EXPORT:
1967 if (ap->a_ctllen != sizeof(struct export_args))
1968 error = EINVAL;
1969 error = hammer_vfs_export(mp, ap->a_op,
1970 (const struct export_args *)ap->a_ctl);
1971 break;
1972 default:
1973 error = journal_mountctl(ap);
1974 break;
1975 }
1976 return(error);
1977 }
1978
1979 /*
1980 * hammer_vop_strategy { vp, bio }
1981 *
1982 * Strategy call, used for regular file read & write only. Note that the
1983 * bp may represent a cluster.
1984 *
1985 * To simplify operation and allow better optimizations in the future,
1986 * this code does not make any assumptions with regards to buffer alignment
1987 * or size.
1988 */
1989 static
1990 int
1991 hammer_vop_strategy(struct vop_strategy_args *ap)
1992 {
1993 struct buf *bp;
1994 int error;
1995
1996 bp = ap->a_bio->bio_buf;
1997
1998 switch(bp->b_cmd) {
1999 case BUF_CMD_READ:
2000 error = hammer_vop_strategy_read(ap);
2001 break;
2002 case BUF_CMD_WRITE:
2003 error = hammer_vop_strategy_write(ap);
2004 break;
2005 default:
2006 bp->b_error = error = EINVAL;
2007 bp->b_flags |= B_ERROR;
2008 biodone(ap->a_bio);
2009 break;
2010 }
2011 return (error);
2012 }
2013
2014 /*
2015 * Read from a regular file. Iterate the related records and fill in the
2016 * BIO/BUF. Gaps are zero-filled.
2017 *
2018 * The support code in hammer_object.c should be used to deal with mixed
2019 * in-memory and on-disk records.
2020 *
2021 * NOTE: Can be called from the cluster code with an oversized buf.
2022 *
2023 * XXX atime update
2024 */
2025 static
2026 int
2027 hammer_vop_strategy_read(struct vop_strategy_args *ap)
2028 {
2029 struct hammer_transaction trans;
2030 struct hammer_inode *ip;
2031 struct hammer_cursor cursor;
2032 hammer_base_elm_t base;
2033 hammer_off_t disk_offset;
2034 struct bio *bio;
2035 struct bio *nbio;
2036 struct buf *bp;
2037 int64_t rec_offset;
2038 int64_t ran_end;
2039 int64_t tmp64;
2040 int error;
2041 int boff;
2042 int roff;
2043 int n;
2044
2045 bio = ap->a_bio;
2046 bp = bio->bio_buf;
2047 ip = ap->a_vp->v_data;
2048
2049 /*
2050 * The zone-2 disk offset may have been set by the cluster code via
2051 * a BMAP operation, or else should be NOOFFSET.
2052 *
2053 * Checking the high bits for a match against zone-2 should suffice.
2054 */
2055 nbio = push_bio(bio);
2056 if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) ==
2057 HAMMER_ZONE_RAW_BUFFER) {
2058 error = hammer_io_direct_read(ip->hmp, nbio);
2059 return (error);
2060 }
2061
2062 /*
2063 * Well, that sucked. Do it the hard way. If all the stars are
2064 * aligned we may still be able to issue a direct-read.
2065 */
2066 hammer_simple_transaction(&trans, ip->hmp);
2067 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2068
2069 /*
2070 * Key range (begin and end inclusive) to scan. Note that the key's
2071 * stored in the actual records represent BASE+LEN, not BASE. The
2072 * first record containing bio_offset will have a key > bio_offset.
2073 */
2074 cursor.key_beg.localization = ip->obj_localization +
2075 HAMMER_LOCALIZE_MISC;
2076 cursor.key_beg.obj_id = ip->obj_id;
2077 cursor.key_beg.create_tid = 0;
2078 cursor.key_beg.delete_tid = 0;
2079 cursor.key_beg.obj_type = 0;
2080 cursor.key_beg.key = bio->bio_offset + 1;
2081 cursor.asof = ip->obj_asof;
2082 cursor.flags |= HAMMER_CURSOR_ASOF;
2083
2084 cursor.key_end = cursor.key_beg;
2085 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2086 #if 0
2087 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) {
2088 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
2089 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
2090 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2091 } else
2092 #endif
2093 {
2094 ran_end = bio->bio_offset + bp->b_bufsize;
2095 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2096 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2097 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2098 if (tmp64 < ran_end)
2099 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2100 else
2101 cursor.key_end.key = ran_end + MAXPHYS + 1;
2102 }
2103 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2104
2105 error = hammer_ip_first(&cursor);
2106 boff = 0;
2107
2108 while (error == 0) {
2109 /*
2110 * Get the base file offset of the record. The key for
2111 * data records is (base + bytes) rather then (base).
2112 */
2113 base = &cursor.leaf->base;
2114 rec_offset = base->key - cursor.leaf->data_len;
2115
2116 /*
2117 * Calculate the gap, if any, and zero-fill it.
2118 *
2119 * n is the offset of the start of the record verses our
2120 * current seek offset in the bio.
2121 */
2122 n = (int)(rec_offset - (bio->bio_offset + boff));
2123 if (n > 0) {
2124 if (n > bp->b_bufsize - boff)
2125 n = bp->b_bufsize - boff;
2126 bzero((char *)bp->b_data + boff, n);
2127 boff += n;
2128 n = 0;
2129 }
2130
2131 /*
2132 * Calculate the data offset in the record and the number
2133 * of bytes we can copy.
2134 *
2135 * There are two degenerate cases. First, boff may already
2136 * be at bp->b_bufsize. Secondly, the data offset within
2137 * the record may exceed the record's size.
2138 */
2139 roff = -n;
2140 rec_offset += roff;
2141 n = cursor.leaf->data_len - roff;
2142 if (n <= 0) {
2143 kprintf("strategy_read: bad n=%d roff=%d\n", n, roff);
2144 n = 0;
2145 } else if (n > bp->b_bufsize - boff) {
2146 n = bp->b_bufsize - boff;
2147 }
2148
2149 /*
2150 * Deal with cached truncations. This cool bit of code
2151 * allows truncate()/ftruncate() to avoid having to sync
2152 * the file.
2153 *
2154 * If the frontend is truncated then all backend records are
2155 * subject to the frontend's truncation.
2156 *
2157 * If the backend is truncated then backend records on-disk
2158 * (but not in-memory) are subject to the backend's
2159 * truncation. In-memory records owned by the backend
2160 * represent data written after the truncation point on the
2161 * backend and must not be truncated.
2162 *
2163 * Truncate operations deal with frontend buffer cache
2164 * buffers and frontend-owned in-memory records synchronously.
2165 */
2166 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2167 if (hammer_cursor_ondisk(&cursor) ||
2168 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2169 if (ip->trunc_off <= rec_offset)
2170 n = 0;
2171 else if (ip->trunc_off < rec_offset + n)
2172 n = (int)(ip->trunc_off - rec_offset);
2173 }
2174 }
2175 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2176 if (hammer_cursor_ondisk(&cursor)) {
2177 if (ip->sync_trunc_off <= rec_offset)
2178 n = 0;
2179 else if (ip->sync_trunc_off < rec_offset + n)
2180 n = (int)(ip->sync_trunc_off - rec_offset);
2181 }
2182 }
2183
2184 /*
2185 * Try to issue a direct read into our bio if possible,
2186 * otherwise resolve the element data into a hammer_buffer
2187 * and copy.
2188 *
2189 * The buffer on-disk should be zerod past any real
2190 * truncation point, but may not be for any synthesized
2191 * truncation point from above.
2192 */
2193 if (boff == 0 && n == bp->b_bufsize &&
2194 ((cursor.leaf->data_offset + roff) & HAMMER_BUFMASK) == 0) {
2195 disk_offset = hammer_blockmap_lookup(
2196 trans.hmp,
2197 cursor.leaf->data_offset + roff,
2198 &error);
2199 if (error)
2200 break;
2201 nbio->bio_offset = disk_offset;
2202 error = hammer_io_direct_read(trans.hmp, nbio);
2203 goto done;
2204 } else if (n) {
2205 error = hammer_ip_resolve_data(&cursor);
2206 if (error == 0) {
2207 bcopy((char *)cursor.data + roff,
2208 (char *)bp->b_data + boff, n);
2209 }
2210 }
2211 if (error)
2212 break;
2213
2214 /*
2215 * Iterate until we have filled the request.
2216 */
2217 boff += n;
2218 if (boff == bp->b_bufsize)
2219 break;
2220 error = hammer_ip_next(&cursor);
2221 }
2222
2223 /*
2224 * There may have been a gap after the last record
2225 */
2226 if (error == ENOENT)
2227 error = 0;
2228 if (error == 0 && boff != bp->b_bufsize) {
2229 KKASSERT(boff < bp->b_bufsize);
2230 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
2231 /* boff = bp->b_bufsize; */
2232 }
2233 bp->b_resid = 0;
2234 bp->b_error = error;
2235 if (error)
2236 bp->b_flags |= B_ERROR;
2237 biodone(ap->a_bio);
2238
2239 done:
2240 if (cursor.node)
2241 hammer_cache_node(&ip->cache[1], cursor.node);
2242 hammer_done_cursor(&cursor);
2243 hammer_done_transaction(&trans);
2244 return(error);
2245 }
2246
2247 /*
2248 * BMAP operation - used to support cluster_read() only.
2249 *
2250 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb)
2251 *
2252 * This routine may return EOPNOTSUPP if the opration is not supported for
2253 * the specified offset. The contents of the pointer arguments do not
2254 * need to be initialized in that case.
2255 *
2256 * If a disk address is available and properly aligned return 0 with
2257 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately
2258 * to the run-length relative to that offset. Callers may assume that
2259 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently
2260 * large, so return EOPNOTSUPP if it is not sufficiently large.
2261 */
2262 static
2263 int
2264 hammer_vop_bmap(struct vop_bmap_args *ap)
2265 {
2266 struct hammer_transaction trans;
2267 struct hammer_inode *ip;
2268 struct hammer_cursor cursor;
2269 hammer_base_elm_t base;
2270 int64_t rec_offset;
2271 int64_t ran_end;
2272 int64_t tmp64;
2273 int64_t base_offset;
2274 int64_t base_disk_offset;
2275 int64_t last_offset;
2276 hammer_off_t last_disk_offset;
2277 hammer_off_t disk_offset;
2278 int rec_len;
2279 int error;
2280 int blksize;
2281
2282 ip = ap->a_vp->v_data;
2283
2284 /*
2285 * We can only BMAP regular files. We can't BMAP database files,
2286 * directories, etc.
2287 */
2288 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE)
2289 return(EOPNOTSUPP);
2290
2291 /*
2292 * bmap is typically called with runp/runb both NULL when used
2293 * for writing. We do not support BMAP for writing atm.
2294 */
2295 if (ap->a_cmd != BUF_CMD_READ)
2296 return(EOPNOTSUPP);
2297
2298 /*
2299 * Scan the B-Tree to acquire blockmap addresses, then translate
2300 * to raw addresses.
2301 */
2302 hammer_simple_transaction(&trans, ip->hmp);
2303 #if 0
2304 kprintf("bmap_beg %016llx ip->cache %p\n", ap->a_loffset, ip->cache[1]);
2305 #endif
2306 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2307
2308 /*
2309 * Key range (begin and end inclusive) to scan. Note that the key's
2310 * stored in the actual records represent BASE+LEN, not BASE. The
2311 * first record containing bio_offset will have a key > bio_offset.
2312 */
2313 cursor.key_beg.localization = ip->obj_localization +
2314 HAMMER_LOCALIZE_MISC;
2315 cursor.key_beg.obj_id = ip->obj_id;
2316 cursor.key_beg.create_tid = 0;
2317 cursor.key_beg.delete_tid = 0;
2318 cursor.key_beg.obj_type = 0;
2319 if (ap->a_runb)
2320 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1;
2321 else
2322 cursor.key_beg.key = ap->a_loffset + 1;
2323 if (cursor.key_beg.key < 0)
2324 cursor.key_beg.key = 0;
2325 cursor.asof = ip->obj_asof;
2326 cursor.flags |= HAMMER_CURSOR_ASOF;
2327
2328 cursor.key_end = cursor.key_beg;
2329 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2330
2331 ran_end = ap->a_loffset + MAXPHYS;
2332 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2333 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2334 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2335 if (tmp64 < ran_end)
2336 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2337 else
2338 cursor.key_end.key = ran_end + MAXPHYS + 1;
2339
2340 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2341
2342 error = hammer_ip_first(&cursor);
2343 base_offset = last_offset = 0;
2344 base_disk_offset = last_disk_offset = 0;
2345
2346 while (error == 0) {
2347 /*
2348 * Get the base file offset of the record. The key for
2349 * data records is (base + bytes) rather then (base).
2350 *
2351 * NOTE: rec_offset + rec_len may exceed the end-of-file.
2352 * The extra bytes should be zero on-disk and the BMAP op
2353 * should still be ok.
2354 */
2355 base = &cursor.leaf->base;
2356 rec_offset = base->key - cursor.leaf->data_len;
2357 rec_len = cursor.leaf->data_len;
2358
2359 /*
2360 * Incorporate any cached truncation.
2361 *
2362 * NOTE: Modifications to rec_len based on synthesized
2363 * truncation points remove the guarantee that any extended
2364 * data on disk is zero (since the truncations may not have
2365 * taken place on-media yet).
2366 */
2367 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2368 if (hammer_cursor_ondisk(&cursor) ||
2369 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2370 if (ip->trunc_off <= rec_offset)
2371 rec_len = 0;
2372 else if (ip->trunc_off < rec_offset + rec_len)
2373 rec_len = (int)(ip->trunc_off - rec_offset);
2374 }
2375 }
2376 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2377 if (hammer_cursor_ondisk(&cursor)) {
2378 if (ip->sync_trunc_off <= rec_offset)
2379 rec_len = 0;
2380 else if (ip->sync_trunc_off < rec_offset + rec_len)
2381 rec_len = (int)(ip->sync_trunc_off - rec_offset);
2382 }
2383 }
2384
2385 /*
2386 * Accumulate information. If we have hit a discontiguous
2387 * block reset base_offset unless we are already beyond the
2388 * requested offset. If we are, that's it, we stop.
2389 */
2390 disk_offset = hammer_blockmap_lookup(trans.hmp,
2391 cursor.leaf->data_offset,
2392 &error);
2393 if (error)
2394 break;
2395 if (rec_offset != last_offset ||
2396 disk_offset != last_disk_offset) {
2397 if (rec_offset > ap->a_loffset)
2398 break;
2399 base_offset = rec_offset;
2400 base_disk_offset = disk_offset;
2401 }
2402 last_offset = rec_offset + rec_len;
2403 last_disk_offset = disk_offset + rec_len;
2404
2405 error = hammer_ip_next(&cursor);
2406 }
2407
2408 #if 0
2409 kprintf("BMAP %016llx: %016llx - %016llx\n",
2410 ap->a_loffset, base_offset, last_offset);
2411 kprintf("BMAP %16s: %016llx - %016llx\n",
2412 "", base_disk_offset, last_disk_offset);
2413 #endif
2414
2415 if (cursor.node) {
2416 hammer_cache_node(&ip->cache[1], cursor.node);
2417 #if 0
2418 kprintf("bmap_end2 %016llx ip->cache %p\n", ap->a_loffset, ip->cache[1]);
2419 #endif
2420 }
2421 hammer_done_cursor(&cursor);
2422 hammer_done_transaction(&trans);
2423
2424 /*
2425 * If we couldn't find any records or the records we did find were
2426 * all behind the requested offset, return failure. A forward
2427 * truncation can leave a hole w/ no on-disk records.
2428 */
2429 if (last_offset == 0 || last_offset < ap->a_loffset)
2430 return (EOPNOTSUPP);
2431
2432 /*
2433 * Figure out the block size at the requested offset and adjust
2434 * our limits so the cluster_read() does not create inappropriately
2435 * sized buffer cache buffers.
2436 */
2437 blksize = hammer_blocksize(ap->a_loffset);
2438 if (hammer_blocksize(base_offset) != blksize) {
2439 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset);
2440 }
2441 if (last_offset != ap->a_loffset &&
2442 hammer_blocksize(last_offset - 1) != blksize) {
2443 last_offset = hammer_blockdemarc(ap->a_loffset,
2444 last_offset - 1);
2445 }
2446
2447 /*
2448 * Returning EOPNOTSUPP simply prevents the direct-IO optimization
2449 * from occuring.
2450 */
2451 disk_offset = base_disk_offset + (ap->a_loffset - base_offset);
2452
2453 /*
2454 * If doffsetp is not aligned or the forward run size does
2455 * not cover a whole buffer, disallow the direct I/O.
2456 */
2457 if ((disk_offset & HAMMER_BUFMASK) ||
2458 (last_offset - ap->a_loffset) < blksize) {
2459 error = EOPNOTSUPP;
2460 } else {
2461 *ap->a_doffsetp = disk_offset;
2462 if (ap->a_runb) {
2463 *ap->a_runb = ap->a_loffset - base_offset;
2464 KKASSERT(*ap->a_runb >= 0);
2465 }
2466 if (ap->a_runp) {
2467 *ap->a_runp = last_offset - ap->a_loffset;
2468 KKASSERT(*ap->a_runp >= 0);
2469 }
2470 error = 0;
2471 }
2472 return(error);
2473 }
2474
2475 /*
2476 * Write to a regular file. Because this is a strategy call the OS is
2477 * trying to actually get data onto the media.
2478 */
2479 static
2480 int
2481 hammer_vop_strategy_write(struct vop_strategy_args *ap)
2482 {
2483 hammer_record_t record;
2484 hammer_mount_t hmp;
2485 hammer_inode_t ip;
2486 struct bio *bio;
2487 struct buf *bp;
2488 int blksize;
2489 int bytes;
2490 int error;
2491
2492 bio = ap->a_bio;
2493 bp = bio->bio_buf;
2494 ip = ap->a_vp->v_data;
2495 hmp = ip->hmp;
2496
2497 blksize = hammer_blocksize(bio->bio_offset);
2498 KKASSERT(bp->b_bufsize == blksize);
2499
2500 if (ip->flags & HAMMER_INODE_RO) {
2501 bp->b_error = EROFS;
2502 bp->b_flags |= B_ERROR;
2503 biodone(ap->a_bio);
2504 return(EROFS);
2505 }
2506
2507 /*
2508 * Interlock with inode destruction (no in-kernel or directory
2509 * topology visibility). If we queue new IO while trying to
2510 * destroy the inode we can deadlock the vtrunc call in
2511 * hammer_inode_unloadable_check().
2512 */
2513 if (ip->flags & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) {
2514 bp->b_resid = 0;
2515 biodone(ap->a_bio);
2516 return(0);
2517 }
2518
2519 /*
2520 * Reserve space and issue a direct-write from the front-end.
2521 * NOTE: The direct_io code will hammer_bread/bcopy smaller
2522 * allocations.
2523 *
2524 * An in-memory record will be installed to reference the storage
2525 * until the flusher can get to it.
2526 *
2527 * Since we own the high level bio the front-end will not try to
2528 * do a direct-read until the write completes.
2529 *
2530 * NOTE: The only time we do not reserve a full-sized buffers
2531 * worth of data is if the file is small. We do not try to
2532 * allocate a fragment (from the small-data zone) at the end of
2533 * an otherwise large file as this can lead to wildly separated
2534 * data.
2535 */
2536 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0);
2537 KKASSERT(bio->bio_offset < ip->ino_data.size);
2538 if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2)
2539 bytes = bp->b_bufsize;
2540 else
2541 bytes = ((int)ip->ino_data.size + 15) & ~15;
2542
2543 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data,
2544 bytes, &error);
2545 if (record) {
2546 hammer_io_direct_write(hmp, &record->leaf, bio);
2547 hammer_rel_mem_record(record);
2548 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs)
2549 hammer_flush_inode(ip, 0);
2550 } else {
2551 bp->b_bio2.bio_offset = NOOFFSET;
2552 bp->b_error = error;
2553 bp->b_flags |= B_ERROR;
2554 biodone(ap->a_bio);
2555 }
2556 return(error);
2557 }
2558
2559 /*
2560 * dounlink - disconnect a directory entry
2561 *
2562 * XXX whiteout support not really in yet
2563 */
2564 static int
2565 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
2566 struct vnode *dvp, struct ucred *cred, int flags)
2567 {
2568 struct namecache *ncp;
2569 hammer_inode_t dip;
2570 hammer_inode_t ip;
2571 struct hammer_cursor cursor;
2572 int64_t namekey;
2573 int nlen, error;
2574
2575 /*
2576 * Calculate the namekey and setup the key range for the scan. This
2577 * works kinda like a chained hash table where the lower 32 bits
2578 * of the namekey synthesize the chain.
2579 *
2580 * The key range is inclusive of both key_beg and key_end.
2581 */
2582 dip = VTOI(dvp);
2583 ncp = nch->ncp;
2584
2585 if (dip->flags & HAMMER_INODE_RO)
2586 return (EROFS);
2587
2588 namekey = hammer_directory_namekey(ncp->nc_name, ncp->nc_nlen);
2589 retry:
2590 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip);
2591 cursor.key_beg.localization = dip->obj_localization +
2592 HAMMER_LOCALIZE_MISC;
2593 cursor.key_beg.obj_id = dip->obj_id;
2594 cursor.key_beg.key = namekey;
2595 cursor.key_beg.create_tid = 0;
2596 cursor.key_beg.delete_tid = 0;
2597 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
2598 cursor.key_beg.obj_type = 0;
2599
2600 cursor.key_end = cursor.key_beg;
2601 cursor.key_end.key |= 0xFFFFFFFFULL;
2602 cursor.asof = dip->obj_asof;
2603 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
2604
2605 /*
2606 * Scan all matching records (the chain), locate the one matching
2607 * the requested path component. info->last_error contains the
2608 * error code on search termination and could be 0, ENOENT, or
2609 * something else.
2610 *
2611 * The hammer_ip_*() functions merge in-memory records with on-disk
2612 * records for the purposes of the search.
2613 */
2614 error = hammer_ip_first(&cursor);
2615
2616 while (error == 0) {
2617 error = hammer_ip_resolve_data(&cursor);
2618 if (error)
2619 break;
2620 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
2621 KKASSERT(nlen > 0);
2622 if (ncp->nc_nlen == nlen &&
2623 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
2624 break;
2625 }
2626 error = hammer_ip_next(&cursor);
2627 }
2628
2629 /*
2630 * If all is ok we have to get the inode so we can adjust nlinks.
2631 * To avoid a deadlock with the flusher we must release the inode
2632 * lock on the directory when acquiring the inode for the entry.
2633 *
2634 * If the target is a directory, it must be empty.
2635 */
2636 if (error == 0) {
2637 hammer_unlock(&cursor.ip->lock);
2638 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id,
2639 dip->hmp->asof,
2640 cursor.data->entry.localization,
2641 0, &error);
2642 hammer_lock_sh(&cursor.ip->lock);
2643 if (error == ENOENT) {
2644 kprintf("obj_id %016llx\n", cursor.data->entry.obj_id);
2645 Debugger("ENOENT unlinking object that should exist");
2646 }
2647
2648 /*
2649 * If we are trying to remove a directory the directory must
2650 * be empty.
2651 *
2652 * WARNING: hammer_ip_check_directory_empty() may have to
2653 * terminate the cursor to avoid a deadlock. It is ok to
2654 * call hammer_done_cursor() twice.
2655 */
2656 if (error == 0 && ip->ino_data.obj_type ==
2657 HAMMER_OBJTYPE_DIRECTORY) {
2658 error = hammer_ip_check_directory_empty(trans, ip);
2659 }
2660
2661 /*
2662 * Delete the directory entry.
2663 *
2664 * WARNING: hammer_ip_del_directory() may have to terminate
2665 * the cursor to avoid a deadlock. It is ok to call
2666 * hammer_done_cursor() twice.
2667 */
2668 if (error == 0) {
2669 error = hammer_ip_del_directory(trans, &cursor,
2670 dip, ip);
2671 }
2672 hammer_done_cursor(&cursor);
2673 if (error == 0) {
2674 cache_setunresolved(nch);
2675 cache_setvp(nch, NULL);
2676 /* XXX locking */
2677 if (ip->vp)
2678 cache_inval_vp(ip->vp, CINV_DESTROY);
2679 }
2680 if (ip)
2681 hammer_rel_inode(ip, 0);
2682 } else {
2683 hammer_done_cursor(&cursor);
2684 }
2685 if (error == EDEADLK)
2686 goto retry;
2687
2688 return (error);
2689 }
2690
2691 /************************************************************************
2692 * FIFO AND SPECFS OPS *
2693 ************************************************************************
2694 *
2695 */
2696
2697 static int
2698 hammer_vop_fifoclose (struct vop_close_args *ap)
2699 {
2700 /* XXX update itimes */
2701 return (VOCALL(&fifo_vnode_vops, &ap->a_head));
2702 }
2703
2704 static int
2705 hammer_vop_fiforead (struct vop_read_args *ap)
2706 {
2707 int error;
2708
2709 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2710 /* XXX update access time */
2711 return (error);
2712 }
2713
2714 static int
2715 hammer_vop_fifowrite (struct vop_write_args *ap)
2716 {
2717 int error;
2718
2719 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2720 /* XXX update access time */
2721 return (error);
2722 }
2723
2724 static int
2725 hammer_vop_specclose (struct vop_close_args *ap)
2726 {
2727 /* XXX update itimes */
2728 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2729 }
2730
2731 static int
2732 hammer_vop_specread (struct vop_read_args *ap)
2733 {
2734 /* XXX update access time */
2735 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2736 }
2737
2738 static int
2739 hammer_vop_specwrite (struct vop_write_args *ap)
2740 {
2741 /* XXX update last change time */
2742 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2743 }
2744
DragonFly BSD