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HAMMER 2.0:01 - MFC HAMMER 2.1:01
[dragonfly.git] / sys / vfs / hammer / hammer_vnops.c
blobe98d5bb7475441560e6cac5db3157ecc4b6f0e87
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 1.91.2.4 2008/08/06 15:41:56 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 ++hammer_count_fsyncs;
186 vfsync(ap->a_vp, ap->a_waitfor, 1, NULL, NULL);
187 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
188 if (ap->a_waitfor == MNT_WAIT)
189 hammer_wait_inode(ip);
190 return (ip->error);
191 }
192
193 /*
194 * hammer_vop_read { vp, uio, ioflag, cred }
195 */
196 static
197 int
198 hammer_vop_read(struct vop_read_args *ap)
199 {
200 struct hammer_transaction trans;
201 hammer_inode_t ip;
202 off_t offset;
203 struct buf *bp;
204 struct uio *uio;
205 int error;
206 int n;
207 int seqcount;
208 int ioseqcount;
209 int blksize;
210
211 if (ap->a_vp->v_type != VREG)
212 return (EINVAL);
213 ip = VTOI(ap->a_vp);
214 error = 0;
215 uio = ap->a_uio;
216
217 /*
218 * Allow the UIO's size to override the sequential heuristic.
219 */
220 blksize = hammer_blocksize(uio->uio_offset);
221 seqcount = (uio->uio_resid + (blksize - 1)) / blksize;
222 ioseqcount = ap->a_ioflag >> 16;
223 if (seqcount < ioseqcount)
224 seqcount = ioseqcount;
225
226 hammer_start_transaction(&trans, ip->hmp);
227
228 /*
229 * Access the data typically in HAMMER_BUFSIZE blocks via the
230 * buffer cache, but HAMMER may use a variable block size based
231 * on the offset.
232 */
233 while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) {
234 int64_t base_offset;
235 int64_t file_limit;
236
237 blksize = hammer_blocksize(uio->uio_offset);
238 offset = (int)uio->uio_offset & (blksize - 1);
239 base_offset = uio->uio_offset - offset;
240
241 if (hammer_cluster_enable) {
242 /*
243 * Use file_limit to prevent cluster_read() from
244 * creating buffers of the wrong block size past
245 * the demarc.
246 */
247 file_limit = ip->ino_data.size;
248 if (base_offset < HAMMER_XDEMARC &&
249 file_limit > HAMMER_XDEMARC) {
250 file_limit = HAMMER_XDEMARC;
251 }
252 error = cluster_read(ap->a_vp,
253 file_limit, base_offset,
254 blksize, MAXPHYS,
255 seqcount, &bp);
256 } else {
257 error = bread(ap->a_vp, base_offset, blksize, &bp);
258 }
259 if (error) {
260 kprintf("error %d\n", error);
261 brelse(bp);
262 break;
263 }
264
265 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
266 n = blksize - offset;
267 if (n > uio->uio_resid)
268 n = uio->uio_resid;
269 if (n > ip->ino_data.size - uio->uio_offset)
270 n = (int)(ip->ino_data.size - uio->uio_offset);
271 error = uiomove((char *)bp->b_data + offset, n, uio);
272
273 /* data has a lower priority then meta-data */
274 bp->b_flags |= B_AGE;
275 bqrelse(bp);
276 if (error)
277 break;
278 hammer_stats_file_read += n;
279 }
280 if ((ip->flags & HAMMER_INODE_RO) == 0 &&
281 (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) {
282 ip->ino_data.atime = trans.time;
283 hammer_modify_inode(ip, HAMMER_INODE_ATIME);
284 }
285 hammer_done_transaction(&trans);
286 return (error);
287 }
288
289 /*
290 * hammer_vop_write { vp, uio, ioflag, cred }
291 */
292 static
293 int
294 hammer_vop_write(struct vop_write_args *ap)
295 {
296 struct hammer_transaction trans;
297 struct hammer_inode *ip;
298 hammer_mount_t hmp;
299 struct uio *uio;
300 int offset;
301 off_t base_offset;
302 struct buf *bp;
303 int error;
304 int n;
305 int flags;
306 int delta;
307 int seqcount;
308
309 if (ap->a_vp->v_type != VREG)
310 return (EINVAL);
311 ip = VTOI(ap->a_vp);
312 hmp = ip->hmp;
313 error = 0;
314 seqcount = ap->a_ioflag >> 16;
315
316 if (ip->flags & HAMMER_INODE_RO)
317 return (EROFS);
318
319 /*
320 * Create a transaction to cover the operations we perform.
321 */
322 hammer_start_transaction(&trans, hmp);
323 uio = ap->a_uio;
324
325 /*
326 * Check append mode
327 */
328 if (ap->a_ioflag & IO_APPEND)
329 uio->uio_offset = ip->ino_data.size;
330
331 /*
332 * Check for illegal write offsets. Valid range is 0...2^63-1.
333 *
334 * NOTE: the base_off assignment is required to work around what
335 * I consider to be a GCC-4 optimization bug.
336 */
337 if (uio->uio_offset < 0) {
338 hammer_done_transaction(&trans);
339 return (EFBIG);
340 }
341 base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */
342 if (uio->uio_resid > 0 && base_offset <= 0) {
343 hammer_done_transaction(&trans);
344 return (EFBIG);
345 }
346
347 /*
348 * Access the data typically in HAMMER_BUFSIZE blocks via the
349 * buffer cache, but HAMMER may use a variable block size based
350 * on the offset.
351 */
352 while (uio->uio_resid > 0) {
353 int fixsize = 0;
354 int blksize;
355 int blkmask;
356
357 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0)
358 break;
359
360 blksize = hammer_blocksize(uio->uio_offset);
361
362 /*
363 * Do not allow HAMMER to blow out the buffer cache. Very
364 * large UIOs can lockout other processes due to bwillwrite()
365 * mechanics.
366 *
367 * The hammer inode is not locked during these operations.
368 * The vnode is locked which can interfere with the pageout
369 * daemon for non-UIO_NOCOPY writes but should not interfere
370 * with the buffer cache. Even so, we cannot afford to
371 * allow the pageout daemon to build up too many dirty buffer
372 * cache buffers.
373 */
374 /*if (((int)uio->uio_offset & (blksize - 1)) == 0)*/
375 bwillwrite(blksize);
376
377 /*
378 * Do not allow HAMMER to blow out system memory by
379 * accumulating too many records. Records are so well
380 * decoupled from the buffer cache that it is possible
381 * for userland to push data out to the media via
382 * direct-write, but build up the records queued to the
383 * backend faster then the backend can flush them out.
384 * HAMMER has hit its write limit but the frontend has
385 * no pushback to slow it down.
386 */
387 if (hmp->rsv_recs > hammer_limit_recs / 2) {
388 /*
389 * Get the inode on the flush list
390 */
391 if (ip->rsv_recs >= 64)
392 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
393 else if (ip->rsv_recs >= 16)
394 hammer_flush_inode(ip, 0);
395
396 /*
397 * Keep the flusher going if the system keeps
398 * queueing records.
399 */
400 delta = hmp->count_newrecords -
401 hmp->last_newrecords;
402 if (delta < 0 || delta > hammer_limit_recs / 2) {
403 hmp->last_newrecords = hmp->count_newrecords;
404 hammer_sync_hmp(hmp, MNT_NOWAIT);
405 }
406
407 /*
408 * If we have gotten behind start slowing
409 * down the writers.
410 */
411 delta = (hmp->rsv_recs - hammer_limit_recs) *
412 hz / hammer_limit_recs;
413 if (delta > 0)
414 tsleep(&trans, 0, "hmrslo", delta);
415 }
416
417 /*
418 * Calculate the blocksize at the current offset and figure
419 * out how much we can actually write.
420 */
421 blkmask = blksize - 1;
422 offset = (int)uio->uio_offset & blkmask;
423 base_offset = uio->uio_offset & ~(int64_t)blkmask;
424 n = blksize - offset;
425 if (n > uio->uio_resid)
426 n = uio->uio_resid;
427 if (uio->uio_offset + n > ip->ino_data.size) {
428 vnode_pager_setsize(ap->a_vp, uio->uio_offset + n);
429 fixsize = 1;
430 }
431
432 if (uio->uio_segflg == UIO_NOCOPY) {
433 /*
434 * Issuing a write with the same data backing the
435 * buffer. Instantiate the buffer to collect the
436 * backing vm pages, then read-in any missing bits.
437 *
438 * This case is used by vop_stdputpages().
439 */
440 bp = getblk(ap->a_vp, base_offset,
441 blksize, GETBLK_BHEAVY, 0);
442 if ((bp->b_flags & B_CACHE) == 0) {
443 bqrelse(bp);
444 error = bread(ap->a_vp, base_offset,
445 blksize, &bp);
446 }
447 } else if (offset == 0 && uio->uio_resid >= blksize) {
448 /*
449 * Even though we are entirely overwriting the buffer
450 * we may still have to zero it out to avoid a
451 * mmap/write visibility issue.
452 */
453 bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0);
454 if ((bp->b_flags & B_CACHE) == 0)
455 vfs_bio_clrbuf(bp);
456 } else if (base_offset >= ip->ino_data.size) {
457 /*
458 * If the base offset of the buffer is beyond the
459 * file EOF, we don't have to issue a read.
460 */
461 bp = getblk(ap->a_vp, base_offset,
462 blksize, GETBLK_BHEAVY, 0);
463 vfs_bio_clrbuf(bp);
464 } else {
465 /*
466 * Partial overwrite, read in any missing bits then
467 * replace the portion being written.
468 */
469 error = bread(ap->a_vp, base_offset, blksize, &bp);
470 if (error == 0)
471 bheavy(bp);
472 }
473 if (error == 0) {
474 error = uiomove((char *)bp->b_data + offset,
475 n, uio);
476 }
477
478 /*
479 * If we screwed up we have to undo any VM size changes we
480 * made.
481 */
482 if (error) {
483 brelse(bp);
484 if (fixsize) {
485 vtruncbuf(ap->a_vp, ip->ino_data.size,
486 hammer_blocksize(ip->ino_data.size));
487 }
488 break;
489 }
490 hammer_stats_file_write += n;
491 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
492 if (ip->ino_data.size < uio->uio_offset) {
493 ip->ino_data.size = uio->uio_offset;
494 flags = HAMMER_INODE_DDIRTY;
495 vnode_pager_setsize(ap->a_vp, ip->ino_data.size);
496 } else {
497 flags = 0;
498 }
499 ip->ino_data.mtime = trans.time;
500 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS;
501 hammer_modify_inode(ip, flags);
502
503 /*
504 * Once we dirty the buffer any cached zone-X offset
505 * becomes invalid. HAMMER NOTE: no-history mode cannot
506 * allow overwriting over the same data sector unless
507 * we provide UNDOs for the old data, which we don't.
508 */
509 bp->b_bio2.bio_offset = NOOFFSET;
510
511 /*
512 * Final buffer disposition.
513 */
514 bp->b_flags |= B_AGE;
515 if (ap->a_ioflag & IO_SYNC) {
516 bwrite(bp);
517 } else if (ap->a_ioflag & IO_DIRECT) {
518 bawrite(bp);
519 } else {
520 bdwrite(bp);
521 }
522 }
523 hammer_done_transaction(&trans);
524 return (error);
525 }
526
527 /*
528 * hammer_vop_access { vp, mode, cred }
529 */
530 static
531 int
532 hammer_vop_access(struct vop_access_args *ap)
533 {
534 struct hammer_inode *ip = VTOI(ap->a_vp);
535 uid_t uid;
536 gid_t gid;
537 int error;
538
539 ++hammer_stats_file_iopsr;
540 uid = hammer_to_unix_xid(&ip->ino_data.uid);
541 gid = hammer_to_unix_xid(&ip->ino_data.gid);
542
543 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
544 ip->ino_data.uflags);
545 return (error);
546 }
547
548 /*
549 * hammer_vop_advlock { vp, id, op, fl, flags }
550 */
551 static
552 int
553 hammer_vop_advlock(struct vop_advlock_args *ap)
554 {
555 hammer_inode_t ip = VTOI(ap->a_vp);
556
557 return (lf_advlock(ap, &ip->advlock, ip->ino_data.size));
558 }
559
560 /*
561 * hammer_vop_close { vp, fflag }
562 */
563 static
564 int
565 hammer_vop_close(struct vop_close_args *ap)
566 {
567 hammer_inode_t ip = VTOI(ap->a_vp);
568
569 if ((ip->flags | ip->sync_flags) & HAMMER_INODE_MODMASK)
570 hammer_inode_waitreclaims(ip->hmp);
571 return (vop_stdclose(ap));
572 }
573
574 /*
575 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
576 *
577 * The operating system has already ensured that the directory entry
578 * does not exist and done all appropriate namespace locking.
579 */
580 static
581 int
582 hammer_vop_ncreate(struct vop_ncreate_args *ap)
583 {
584 struct hammer_transaction trans;
585 struct hammer_inode *dip;
586 struct hammer_inode *nip;
587 struct nchandle *nch;
588 int error;
589
590 nch = ap->a_nch;
591 dip = VTOI(ap->a_dvp);
592
593 if (dip->flags & HAMMER_INODE_RO)
594 return (EROFS);
595 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
596 return (error);
597
598 /*
599 * Create a transaction to cover the operations we perform.
600 */
601 hammer_start_transaction(&trans, dip->hmp);
602 ++hammer_stats_file_iopsw;
603
604 /*
605 * Create a new filesystem object of the requested type. The
606 * returned inode will be referenced and shared-locked to prevent
607 * it from being moved to the flusher.
608 */
609
610 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
611 dip, NULL, &nip);
612 if (error) {
613 hkprintf("hammer_create_inode error %d\n", error);
614 hammer_done_transaction(&trans);
615 *ap->a_vpp = NULL;
616 return (error);
617 }
618
619 /*
620 * Add the new filesystem object to the directory. This will also
621 * bump the inode's link count.
622 */
623 error = hammer_ip_add_directory(&trans, dip,
624 nch->ncp->nc_name, nch->ncp->nc_nlen,
625 nip);
626 if (error)
627 hkprintf("hammer_ip_add_directory error %d\n", error);
628
629 /*
630 * Finish up.
631 */
632 if (error) {
633 hammer_rel_inode(nip, 0);
634 hammer_done_transaction(&trans);
635 *ap->a_vpp = NULL;
636 } else {
637 error = hammer_get_vnode(nip, ap->a_vpp);
638 hammer_done_transaction(&trans);
639 hammer_rel_inode(nip, 0);
640 if (error == 0) {
641 cache_setunresolved(ap->a_nch);
642 cache_setvp(ap->a_nch, *ap->a_vpp);
643 }
644 }
645 return (error);
646 }
647
648 /*
649 * hammer_vop_getattr { vp, vap }
650 *
651 * Retrieve an inode's attribute information. When accessing inodes
652 * historically we fake the atime field to ensure consistent results.
653 * The atime field is stored in the B-Tree element and allowed to be
654 * updated without cycling the element.
655 */
656 static
657 int
658 hammer_vop_getattr(struct vop_getattr_args *ap)
659 {
660 struct hammer_inode *ip = VTOI(ap->a_vp);
661 struct vattr *vap = ap->a_vap;
662
663 /*
664 * We want the fsid to be different when accessing a filesystem
665 * with different as-of's so programs like diff don't think
666 * the files are the same.
667 *
668 * We also want the fsid to be the same when comparing snapshots,
669 * or when comparing mirrors (which might be backed by different
670 * physical devices). HAMMER fsids are based on the PFS's
671 * shared_uuid field.
672 *
673 * XXX there is a chance of collision here. The va_fsid reported
674 * by stat is different from the more involved fsid used in the
675 * mount structure.
676 */
677 ++hammer_stats_file_iopsr;
678 vap->va_fsid = ip->pfsm->fsid_udev ^ (u_int32_t)ip->obj_asof ^
679 (u_int32_t)(ip->obj_asof >> 32);
680
681 vap->va_fileid = ip->ino_leaf.base.obj_id;
682 vap->va_mode = ip->ino_data.mode;
683 vap->va_nlink = ip->ino_data.nlinks;
684 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
685 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
686 vap->va_rmajor = 0;
687 vap->va_rminor = 0;
688 vap->va_size = ip->ino_data.size;
689
690 /*
691 * Special case for @@PFS softlinks. The actual size of the
692 * expanded softlink is "@@0x%016llx:%05d" == 26 bytes.
693 */
694 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK &&
695 ip->ino_data.size == 10 &&
696 ip->obj_asof == HAMMER_MAX_TID &&
697 ip->obj_localization == 0 &&
698 strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) {
699 vap->va_size = 26;
700 }
701
702 /*
703 * We must provide a consistent atime and mtime for snapshots
704 * so people can do a 'tar cf - ... | md5' on them and get
705 * consistent results.
706 */
707 if (ip->flags & HAMMER_INODE_RO) {
708 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime);
709 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime);
710 } else {
711 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime);
712 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime);
713 }
714 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
715 vap->va_flags = ip->ino_data.uflags;
716 vap->va_gen = 1; /* hammer inums are unique for all time */
717 vap->va_blocksize = HAMMER_BUFSIZE;
718 if (ip->ino_data.size >= HAMMER_XDEMARC) {
719 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) &
720 ~HAMMER_XBUFMASK64;
721 } else if (ip->ino_data.size > HAMMER_BUFSIZE / 2) {
722 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) &
723 ~HAMMER_BUFMASK64;
724 } else {
725 vap->va_bytes = (ip->ino_data.size + 15) & ~15;
726 }
727 vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type);
728 vap->va_filerev = 0; /* XXX */
729 /* mtime uniquely identifies any adjustments made to the file XXX */
730 vap->va_fsmid = ip->ino_data.mtime;
731 vap->va_uid_uuid = ip->ino_data.uid;
732 vap->va_gid_uuid = ip->ino_data.gid;
733 vap->va_fsid_uuid = ip->hmp->fsid;
734 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
735 VA_FSID_UUID_VALID;
736
737 switch (ip->ino_data.obj_type) {
738 case HAMMER_OBJTYPE_CDEV:
739 case HAMMER_OBJTYPE_BDEV:
740 vap->va_rmajor = ip->ino_data.rmajor;
741 vap->va_rminor = ip->ino_data.rminor;
742 break;
743 default:
744 break;
745 }
746 return(0);
747 }
748
749 /*
750 * hammer_vop_nresolve { nch, dvp, cred }
751 *
752 * Locate the requested directory entry.
753 */
754 static
755 int
756 hammer_vop_nresolve(struct vop_nresolve_args *ap)
757 {
758 struct hammer_transaction trans;
759 struct namecache *ncp;
760 hammer_inode_t dip;
761 hammer_inode_t ip;
762 hammer_tid_t asof;
763 struct hammer_cursor cursor;
764 struct vnode *vp;
765 int64_t namekey;
766 int error;
767 int i;
768 int nlen;
769 int flags;
770 int ispfs;
771 int64_t obj_id;
772 u_int32_t localization;
773
774 /*
775 * Misc initialization, plus handle as-of name extensions. Look for
776 * the '@@' extension. Note that as-of files and directories cannot
777 * be modified.
778 */
779 dip = VTOI(ap->a_dvp);
780 ncp = ap->a_nch->ncp;
781 asof = dip->obj_asof;
782 nlen = ncp->nc_nlen;
783 flags = dip->flags & HAMMER_INODE_RO;
784 ispfs = 0;
785
786 hammer_simple_transaction(&trans, dip->hmp);
787 ++hammer_stats_file_iopsr;
788
789 for (i = 0; i < nlen; ++i) {
790 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
791 asof = hammer_str_to_tid(ncp->nc_name + i + 2,
792 &ispfs, &localization);
793 if (asof != HAMMER_MAX_TID)
794 flags |= HAMMER_INODE_RO;
795 break;
796 }
797 }
798 nlen = i;
799
800 /*
801 * If this is a PFS softlink we dive into the PFS
802 */
803 if (ispfs && nlen == 0) {
804 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT,
805 asof, localization,
806 flags, &error);
807 if (error == 0) {
808 error = hammer_get_vnode(ip, &vp);
809 hammer_rel_inode(ip, 0);
810 } else {
811 vp = NULL;
812 }
813 if (error == 0) {
814 vn_unlock(vp);
815 cache_setvp(ap->a_nch, vp);
816 vrele(vp);
817 }
818 goto done;
819 }
820
821 /*
822 * If there is no path component the time extension is relative to
823 * dip.
824 */
825 if (nlen == 0) {
826 ip = hammer_get_inode(&trans, dip, dip->obj_id,
827 asof, dip->obj_localization,
828 flags, &error);
829 if (error == 0) {
830 error = hammer_get_vnode(ip, &vp);
831 hammer_rel_inode(ip, 0);
832 } else {
833 vp = NULL;
834 }
835 if (error == 0) {
836 vn_unlock(vp);
837 cache_setvp(ap->a_nch, vp);
838 vrele(vp);
839 }
840 goto done;
841 }
842
843 /*
844 * Calculate the namekey and setup the key range for the scan. This
845 * works kinda like a chained hash table where the lower 32 bits
846 * of the namekey synthesize the chain.
847 *
848 * The key range is inclusive of both key_beg and key_end.
849 */
850 namekey = hammer_directory_namekey(ncp->nc_name, nlen);
851
852 error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip);
853 cursor.key_beg.localization = dip->obj_localization +
854 HAMMER_LOCALIZE_MISC;
855 cursor.key_beg.obj_id = dip->obj_id;
856 cursor.key_beg.key = namekey;
857 cursor.key_beg.create_tid = 0;
858 cursor.key_beg.delete_tid = 0;
859 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
860 cursor.key_beg.obj_type = 0;
861
862 cursor.key_end = cursor.key_beg;
863 cursor.key_end.key |= 0xFFFFFFFFULL;
864 cursor.asof = asof;
865 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
866
867 /*
868 * Scan all matching records (the chain), locate the one matching
869 * the requested path component.
870 *
871 * The hammer_ip_*() functions merge in-memory records with on-disk
872 * records for the purposes of the search.
873 */
874 obj_id = 0;
875 localization = HAMMER_DEF_LOCALIZATION;
876
877 if (error == 0) {
878 error = hammer_ip_first(&cursor);
879 while (error == 0) {
880 error = hammer_ip_resolve_data(&cursor);
881 if (error)
882 break;
883 if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF &&
884 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
885 obj_id = cursor.data->entry.obj_id;
886 localization = cursor.data->entry.localization;
887 break;
888 }
889 error = hammer_ip_next(&cursor);
890 }
891 }
892 hammer_done_cursor(&cursor);
893 if (error == 0) {
894 ip = hammer_get_inode(&trans, dip, obj_id,
895 asof, localization,
896 flags, &error);
897 if (error == 0) {
898 error = hammer_get_vnode(ip, &vp);
899 hammer_rel_inode(ip, 0);
900 } else {
901 vp = NULL;
902 }
903 if (error == 0) {
904 vn_unlock(vp);
905 cache_setvp(ap->a_nch, vp);
906 vrele(vp);
907 }
908 } else if (error == ENOENT) {
909 cache_setvp(ap->a_nch, NULL);
910 }
911 done:
912 hammer_done_transaction(&trans);
913 return (error);
914 }
915
916 /*
917 * hammer_vop_nlookupdotdot { dvp, vpp, cred }
918 *
919 * Locate the parent directory of a directory vnode.
920 *
921 * dvp is referenced but not locked. *vpp must be returned referenced and
922 * locked. A parent_obj_id of 0 does not necessarily indicate that we are
923 * at the root, instead it could indicate that the directory we were in was
924 * removed.
925 *
926 * NOTE: as-of sequences are not linked into the directory structure. If
927 * we are at the root with a different asof then the mount point, reload
928 * the same directory with the mount point's asof. I'm not sure what this
929 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not
930 * get confused, but it hasn't been tested.
931 */
932 static
933 int
934 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
935 {
936 struct hammer_transaction trans;
937 struct hammer_inode *dip;
938 struct hammer_inode *ip;
939 int64_t parent_obj_id;
940 u_int32_t parent_obj_localization;
941 hammer_tid_t asof;
942 int error;
943
944 dip = VTOI(ap->a_dvp);
945 asof = dip->obj_asof;
946
947 /*
948 * Whos are parent? This could be the root of a pseudo-filesystem
949 * whos parent is in another localization domain.
950 */
951 parent_obj_id = dip->ino_data.parent_obj_id;
952 if (dip->obj_id == HAMMER_OBJID_ROOT)
953 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization;
954 else
955 parent_obj_localization = dip->obj_localization;
956
957 if (parent_obj_id == 0) {
958 if (dip->obj_id == HAMMER_OBJID_ROOT &&
959 asof != dip->hmp->asof) {
960 parent_obj_id = dip->obj_id;
961 asof = dip->hmp->asof;
962 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK);
963 ksnprintf(*ap->a_fakename, 19, "0x%016llx",
964 dip->obj_asof);
965 } else {
966 *ap->a_vpp = NULL;
967 return ENOENT;
968 }
969 }
970
971 hammer_simple_transaction(&trans, dip->hmp);
972 ++hammer_stats_file_iopsr;
973
974 ip = hammer_get_inode(&trans, dip, parent_obj_id,
975 asof, parent_obj_localization,
976 dip->flags, &error);
977 if (ip) {
978 error = hammer_get_vnode(ip, ap->a_vpp);
979 hammer_rel_inode(ip, 0);
980 } else {
981 *ap->a_vpp = NULL;
982 }
983 hammer_done_transaction(&trans);
984 return (error);
985 }
986
987 /*
988 * hammer_vop_nlink { nch, dvp, vp, cred }
989 */
990 static
991 int
992 hammer_vop_nlink(struct vop_nlink_args *ap)
993 {
994 struct hammer_transaction trans;
995 struct hammer_inode *dip;
996 struct hammer_inode *ip;
997 struct nchandle *nch;
998 int error;
999
1000 if (ap->a_dvp->v_mount != ap->a_vp->v_mount)
1001 return(EXDEV);
1002
1003 nch = ap->a_nch;
1004 dip = VTOI(ap->a_dvp);
1005 ip = VTOI(ap->a_vp);
1006
1007 if (dip->obj_localization != ip->obj_localization)
1008 return(EXDEV);
1009
1010 if (dip->flags & HAMMER_INODE_RO)
1011 return (EROFS);
1012 if (ip->flags & HAMMER_INODE_RO)
1013 return (EROFS);
1014 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1015 return (error);
1016
1017 /*
1018 * Create a transaction to cover the operations we perform.
1019 */
1020 hammer_start_transaction(&trans, dip->hmp);
1021 ++hammer_stats_file_iopsw;
1022
1023 /*
1024 * Add the filesystem object to the directory. Note that neither
1025 * dip nor ip are referenced or locked, but their vnodes are
1026 * referenced. This function will bump the inode's link count.
1027 */
1028 error = hammer_ip_add_directory(&trans, dip,
1029 nch->ncp->nc_name, nch->ncp->nc_nlen,
1030 ip);
1031
1032 /*
1033 * Finish up.
1034 */
1035 if (error == 0) {
1036 cache_setunresolved(nch);
1037 cache_setvp(nch, ap->a_vp);
1038 }
1039 hammer_done_transaction(&trans);
1040 return (error);
1041 }
1042
1043 /*
1044 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
1045 *
1046 * The operating system has already ensured that the directory entry
1047 * does not exist and done all appropriate namespace locking.
1048 */
1049 static
1050 int
1051 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
1052 {
1053 struct hammer_transaction trans;
1054 struct hammer_inode *dip;
1055 struct hammer_inode *nip;
1056 struct nchandle *nch;
1057 int error;
1058
1059 nch = ap->a_nch;
1060 dip = VTOI(ap->a_dvp);
1061
1062 if (dip->flags & HAMMER_INODE_RO)
1063 return (EROFS);
1064 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1065 return (error);
1066
1067 /*
1068 * Create a transaction to cover the operations we perform.
1069 */
1070 hammer_start_transaction(&trans, dip->hmp);
1071 ++hammer_stats_file_iopsw;
1072
1073 /*
1074 * Create a new filesystem object of the requested type. The
1075 * returned inode will be referenced but not locked.
1076 */
1077 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1078 dip, NULL, &nip);
1079 if (error) {
1080 hkprintf("hammer_mkdir error %d\n", error);
1081 hammer_done_transaction(&trans);
1082 *ap->a_vpp = NULL;
1083 return (error);
1084 }
1085 /*
1086 * Add the new filesystem object to the directory. This will also
1087 * bump the inode's link count.
1088 */
1089 error = hammer_ip_add_directory(&trans, dip,
1090 nch->ncp->nc_name, nch->ncp->nc_nlen,
1091 nip);
1092 if (error)
1093 hkprintf("hammer_mkdir (add) error %d\n", error);
1094
1095 /*
1096 * Finish up.
1097 */
1098 if (error) {
1099 hammer_rel_inode(nip, 0);
1100 *ap->a_vpp = NULL;
1101 } else {
1102 error = hammer_get_vnode(nip, ap->a_vpp);
1103 hammer_rel_inode(nip, 0);
1104 if (error == 0) {
1105 cache_setunresolved(ap->a_nch);
1106 cache_setvp(ap->a_nch, *ap->a_vpp);
1107 }
1108 }
1109 hammer_done_transaction(&trans);
1110 return (error);
1111 }
1112
1113 /*
1114 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
1115 *
1116 * The operating system has already ensured that the directory entry
1117 * does not exist and done all appropriate namespace locking.
1118 */
1119 static
1120 int
1121 hammer_vop_nmknod(struct vop_nmknod_args *ap)
1122 {
1123 struct hammer_transaction trans;
1124 struct hammer_inode *dip;
1125 struct hammer_inode *nip;
1126 struct nchandle *nch;
1127 int error;
1128
1129 nch = ap->a_nch;
1130 dip = VTOI(ap->a_dvp);
1131
1132 if (dip->flags & HAMMER_INODE_RO)
1133 return (EROFS);
1134 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1135 return (error);
1136
1137 /*
1138 * Create a transaction to cover the operations we perform.
1139 */
1140 hammer_start_transaction(&trans, dip->hmp);
1141 ++hammer_stats_file_iopsw;
1142
1143 /*
1144 * Create a new filesystem object of the requested type. The
1145 * returned inode will be referenced but not locked.
1146 *
1147 * If mknod specifies a directory a pseudo-fs is created.
1148 */
1149 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1150 dip, NULL, &nip);
1151 if (error) {
1152 hammer_done_transaction(&trans);
1153 *ap->a_vpp = NULL;
1154 return (error);
1155 }
1156
1157 /*
1158 * Add the new filesystem object to the directory. This will also
1159 * bump the inode's link count.
1160 */
1161 error = hammer_ip_add_directory(&trans, dip,
1162 nch->ncp->nc_name, nch->ncp->nc_nlen,
1163 nip);
1164
1165 /*
1166 * Finish up.
1167 */
1168 if (error) {
1169 hammer_rel_inode(nip, 0);
1170 *ap->a_vpp = NULL;
1171 } else {
1172 error = hammer_get_vnode(nip, ap->a_vpp);
1173 hammer_rel_inode(nip, 0);
1174 if (error == 0) {
1175 cache_setunresolved(ap->a_nch);
1176 cache_setvp(ap->a_nch, *ap->a_vpp);
1177 }
1178 }
1179 hammer_done_transaction(&trans);
1180 return (error);
1181 }
1182
1183 /*
1184 * hammer_vop_open { vp, mode, cred, fp }
1185 */
1186 static
1187 int
1188 hammer_vop_open(struct vop_open_args *ap)
1189 {
1190 hammer_inode_t ip;
1191
1192 ++hammer_stats_file_iopsr;
1193 ip = VTOI(ap->a_vp);
1194
1195 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO))
1196 return (EROFS);
1197 return(vop_stdopen(ap));
1198 }
1199
1200 /*
1201 * hammer_vop_pathconf { vp, name, retval }
1202 */
1203 static
1204 int
1205 hammer_vop_pathconf(struct vop_pathconf_args *ap)
1206 {
1207 return EOPNOTSUPP;
1208 }
1209
1210 /*
1211 * hammer_vop_print { vp }
1212 */
1213 static
1214 int
1215 hammer_vop_print(struct vop_print_args *ap)
1216 {
1217 return EOPNOTSUPP;
1218 }
1219
1220 /*
1221 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
1222 */
1223 static
1224 int
1225 hammer_vop_readdir(struct vop_readdir_args *ap)
1226 {
1227 struct hammer_transaction trans;
1228 struct hammer_cursor cursor;
1229 struct hammer_inode *ip;
1230 struct uio *uio;
1231 hammer_base_elm_t base;
1232 int error;
1233 int cookie_index;
1234 int ncookies;
1235 off_t *cookies;
1236 off_t saveoff;
1237 int r;
1238 int dtype;
1239
1240 ++hammer_stats_file_iopsr;
1241 ip = VTOI(ap->a_vp);
1242 uio = ap->a_uio;
1243 saveoff = uio->uio_offset;
1244
1245 if (ap->a_ncookies) {
1246 ncookies = uio->uio_resid / 16 + 1;
1247 if (ncookies > 1024)
1248 ncookies = 1024;
1249 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
1250 cookie_index = 0;
1251 } else {
1252 ncookies = -1;
1253 cookies = NULL;
1254 cookie_index = 0;
1255 }
1256
1257 hammer_simple_transaction(&trans, ip->hmp);
1258
1259 /*
1260 * Handle artificial entries
1261 */
1262 error = 0;
1263 if (saveoff == 0) {
1264 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
1265 if (r)
1266 goto done;
1267 if (cookies)
1268 cookies[cookie_index] = saveoff;
1269 ++saveoff;
1270 ++cookie_index;
1271 if (cookie_index == ncookies)
1272 goto done;
1273 }
1274 if (saveoff == 1) {
1275 if (ip->ino_data.parent_obj_id) {
1276 r = vop_write_dirent(&error, uio,
1277 ip->ino_data.parent_obj_id,
1278 DT_DIR, 2, "..");
1279 } else {
1280 r = vop_write_dirent(&error, uio,
1281 ip->obj_id, DT_DIR, 2, "..");
1282 }
1283 if (r)
1284 goto done;
1285 if (cookies)
1286 cookies[cookie_index] = saveoff;
1287 ++saveoff;
1288 ++cookie_index;
1289 if (cookie_index == ncookies)
1290 goto done;
1291 }
1292
1293 /*
1294 * Key range (begin and end inclusive) to scan. Directory keys
1295 * directly translate to a 64 bit 'seek' position.
1296 */
1297 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1298 cursor.key_beg.localization = ip->obj_localization +
1299 HAMMER_LOCALIZE_MISC;
1300 cursor.key_beg.obj_id = ip->obj_id;
1301 cursor.key_beg.create_tid = 0;
1302 cursor.key_beg.delete_tid = 0;
1303 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1304 cursor.key_beg.obj_type = 0;
1305 cursor.key_beg.key = saveoff;
1306
1307 cursor.key_end = cursor.key_beg;
1308 cursor.key_end.key = HAMMER_MAX_KEY;
1309 cursor.asof = ip->obj_asof;
1310 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1311
1312 error = hammer_ip_first(&cursor);
1313
1314 while (error == 0) {
1315 error = hammer_ip_resolve_data(&cursor);
1316 if (error)
1317 break;
1318 base = &cursor.leaf->base;
1319 saveoff = base->key;
1320 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF);
1321
1322 if (base->obj_id != ip->obj_id)
1323 panic("readdir: bad record at %p", cursor.node);
1324
1325 /*
1326 * Convert pseudo-filesystems into softlinks
1327 */
1328 dtype = hammer_get_dtype(cursor.leaf->base.obj_type);
1329 r = vop_write_dirent(
1330 &error, uio, cursor.data->entry.obj_id,
1331 dtype,
1332 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF ,
1333 (void *)cursor.data->entry.name);
1334 if (r)
1335 break;
1336 ++saveoff;
1337 if (cookies)
1338 cookies[cookie_index] = base->key;
1339 ++cookie_index;
1340 if (cookie_index == ncookies)
1341 break;
1342 error = hammer_ip_next(&cursor);
1343 }
1344 hammer_done_cursor(&cursor);
1345
1346 done:
1347 hammer_done_transaction(&trans);
1348
1349 if (ap->a_eofflag)
1350 *ap->a_eofflag = (error == ENOENT);
1351 uio->uio_offset = saveoff;
1352 if (error && cookie_index == 0) {
1353 if (error == ENOENT)
1354 error = 0;
1355 if (cookies) {
1356 kfree(cookies, M_TEMP);
1357 *ap->a_ncookies = 0;
1358 *ap->a_cookies = NULL;
1359 }
1360 } else {
1361 if (error == ENOENT)
1362 error = 0;
1363 if (cookies) {
1364 *ap->a_ncookies = cookie_index;
1365 *ap->a_cookies = cookies;
1366 }
1367 }
1368 return(error);
1369 }
1370
1371 /*
1372 * hammer_vop_readlink { vp, uio, cred }
1373 */
1374 static
1375 int
1376 hammer_vop_readlink(struct vop_readlink_args *ap)
1377 {
1378 struct hammer_transaction trans;
1379 struct hammer_cursor cursor;
1380 struct hammer_inode *ip;
1381 char buf[32];
1382 u_int32_t localization;
1383 hammer_pseudofs_inmem_t pfsm;
1384 int error;
1385
1386 ip = VTOI(ap->a_vp);
1387
1388 /*
1389 * Shortcut if the symlink data was stuffed into ino_data.
1390 *
1391 * Also expand special "@@PFS%05d" softlinks (expansion only
1392 * occurs for non-historical (current) accesses made from the
1393 * primary filesystem).
1394 */
1395 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) {
1396 char *ptr;
1397 int bytes;
1398
1399 ptr = ip->ino_data.ext.symlink;
1400 bytes = (int)ip->ino_data.size;
1401 if (bytes == 10 &&
1402 ip->obj_asof == HAMMER_MAX_TID &&
1403 ip->obj_localization == 0 &&
1404 strncmp(ptr, "@@PFS", 5) == 0) {
1405 hammer_simple_transaction(&trans, ip->hmp);
1406 bcopy(ptr + 5, buf, 5);
1407 buf[5] = 0;
1408 localization = strtoul(buf, NULL, 10) << 16;
1409 pfsm = hammer_load_pseudofs(&trans, localization,
1410 &error);
1411 if (error == 0) {
1412 if (pfsm->pfsd.mirror_flags &
1413 HAMMER_PFSD_SLAVE) {
1414 ksnprintf(buf, sizeof(buf),
1415 "@@0x%016llx:%05d",
1416 pfsm->pfsd.sync_end_tid,
1417 localization >> 16);
1418 } else {
1419 ksnprintf(buf, sizeof(buf),
1420 "@@0x%016llx:%05d",
1421 HAMMER_MAX_TID,
1422 localization >> 16);
1423 }
1424 ptr = buf;
1425 bytes = strlen(buf);
1426 }
1427 if (pfsm)
1428 hammer_rel_pseudofs(trans.hmp, pfsm);
1429 hammer_done_transaction(&trans);
1430 }
1431 error = uiomove(ptr, bytes, ap->a_uio);
1432 return(error);
1433 }
1434
1435 /*
1436 * Long version
1437 */
1438 hammer_simple_transaction(&trans, ip->hmp);
1439 ++hammer_stats_file_iopsr;
1440 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1441
1442 /*
1443 * Key range (begin and end inclusive) to scan. Directory keys
1444 * directly translate to a 64 bit 'seek' position.
1445 */
1446 cursor.key_beg.localization = ip->obj_localization +
1447 HAMMER_LOCALIZE_MISC;
1448 cursor.key_beg.obj_id = ip->obj_id;
1449 cursor.key_beg.create_tid = 0;
1450 cursor.key_beg.delete_tid = 0;
1451 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1452 cursor.key_beg.obj_type = 0;
1453 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1454 cursor.asof = ip->obj_asof;
1455 cursor.flags |= HAMMER_CURSOR_ASOF;
1456
1457 error = hammer_ip_lookup(&cursor);
1458 if (error == 0) {
1459 error = hammer_ip_resolve_data(&cursor);
1460 if (error == 0) {
1461 KKASSERT(cursor.leaf->data_len >=
1462 HAMMER_SYMLINK_NAME_OFF);
1463 error = uiomove(cursor.data->symlink.name,
1464 cursor.leaf->data_len -
1465 HAMMER_SYMLINK_NAME_OFF,
1466 ap->a_uio);
1467 }
1468 }
1469 hammer_done_cursor(&cursor);
1470 hammer_done_transaction(&trans);
1471 return(error);
1472 }
1473
1474 /*
1475 * hammer_vop_nremove { nch, dvp, cred }
1476 */
1477 static
1478 int
1479 hammer_vop_nremove(struct vop_nremove_args *ap)
1480 {
1481 struct hammer_transaction trans;
1482 struct hammer_inode *dip;
1483 int error;
1484
1485 dip = VTOI(ap->a_dvp);
1486
1487 if (hammer_nohistory(dip) == 0 &&
1488 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1489 return (error);
1490 }
1491
1492 hammer_start_transaction(&trans, dip->hmp);
1493 ++hammer_stats_file_iopsw;
1494 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0);
1495 hammer_done_transaction(&trans);
1496
1497 return (error);
1498 }
1499
1500 /*
1501 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1502 */
1503 static
1504 int
1505 hammer_vop_nrename(struct vop_nrename_args *ap)
1506 {
1507 struct hammer_transaction trans;
1508 struct namecache *fncp;
1509 struct namecache *tncp;
1510 struct hammer_inode *fdip;
1511 struct hammer_inode *tdip;
1512 struct hammer_inode *ip;
1513 struct hammer_cursor cursor;
1514 int64_t namekey;
1515 int nlen, error;
1516
1517 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount)
1518 return(EXDEV);
1519 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
1520 return(EXDEV);
1521
1522 fdip = VTOI(ap->a_fdvp);
1523 tdip = VTOI(ap->a_tdvp);
1524 fncp = ap->a_fnch->ncp;
1525 tncp = ap->a_tnch->ncp;
1526 ip = VTOI(fncp->nc_vp);
1527 KKASSERT(ip != NULL);
1528
1529 if (fdip->obj_localization != tdip->obj_localization)
1530 return(EXDEV);
1531 if (fdip->obj_localization != ip->obj_localization)
1532 return(EXDEV);
1533
1534 if (fdip->flags & HAMMER_INODE_RO)
1535 return (EROFS);
1536 if (tdip->flags & HAMMER_INODE_RO)
1537 return (EROFS);
1538 if (ip->flags & HAMMER_INODE_RO)
1539 return (EROFS);
1540 if ((error = hammer_checkspace(fdip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1541 return (error);
1542
1543 hammer_start_transaction(&trans, fdip->hmp);
1544 ++hammer_stats_file_iopsw;
1545
1546 /*
1547 * Remove tncp from the target directory and then link ip as
1548 * tncp. XXX pass trans to dounlink
1549 *
1550 * Force the inode sync-time to match the transaction so it is
1551 * in-sync with the creation of the target directory entry.
1552 */
1553 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp, ap->a_cred, 0);
1554 if (error == 0 || error == ENOENT) {
1555 error = hammer_ip_add_directory(&trans, tdip,
1556 tncp->nc_name, tncp->nc_nlen,
1557 ip);
1558 if (error == 0) {
1559 ip->ino_data.parent_obj_id = tdip->obj_id;
1560 hammer_modify_inode(ip, HAMMER_INODE_DDIRTY);
1561 }
1562 }
1563 if (error)
1564 goto failed; /* XXX */
1565
1566 /*
1567 * Locate the record in the originating directory and remove it.
1568 *
1569 * Calculate the namekey and setup the key range for the scan. This
1570 * works kinda like a chained hash table where the lower 32 bits
1571 * of the namekey synthesize the chain.
1572 *
1573 * The key range is inclusive of both key_beg and key_end.
1574 */
1575 namekey = hammer_directory_namekey(fncp->nc_name, fncp->nc_nlen);
1576 retry:
1577 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip);
1578 cursor.key_beg.localization = fdip->obj_localization +
1579 HAMMER_LOCALIZE_MISC;
1580 cursor.key_beg.obj_id = fdip->obj_id;
1581 cursor.key_beg.key = namekey;
1582 cursor.key_beg.create_tid = 0;
1583 cursor.key_beg.delete_tid = 0;
1584 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1585 cursor.key_beg.obj_type = 0;
1586
1587 cursor.key_end = cursor.key_beg;
1588 cursor.key_end.key |= 0xFFFFFFFFULL;
1589 cursor.asof = fdip->obj_asof;
1590 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1591
1592 /*
1593 * Scan all matching records (the chain), locate the one matching
1594 * the requested path component.
1595 *
1596 * The hammer_ip_*() functions merge in-memory records with on-disk
1597 * records for the purposes of the search.
1598 */
1599 error = hammer_ip_first(&cursor);
1600 while (error == 0) {
1601 if (hammer_ip_resolve_data(&cursor) != 0)
1602 break;
1603 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
1604 KKASSERT(nlen > 0);
1605 if (fncp->nc_nlen == nlen &&
1606 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) {
1607 break;
1608 }
1609 error = hammer_ip_next(&cursor);
1610 }
1611
1612 /*
1613 * If all is ok we have to get the inode so we can adjust nlinks.
1614 *
1615 * WARNING: hammer_ip_del_directory() may have to terminate the
1616 * cursor to avoid a recursion. It's ok to call hammer_done_cursor()
1617 * twice.
1618 */
1619 if (error == 0)
1620 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
1621
1622 /*
1623 * XXX A deadlock here will break rename's atomicy for the purposes
1624 * of crash recovery.
1625 */
1626 if (error == EDEADLK) {
1627 hammer_done_cursor(&cursor);
1628 goto retry;
1629 }
1630
1631 /*
1632 * Cleanup and tell the kernel that the rename succeeded.
1633 */
1634 hammer_done_cursor(&cursor);
1635 if (error == 0)
1636 cache_rename(ap->a_fnch, ap->a_tnch);
1637
1638 failed:
1639 hammer_done_transaction(&trans);
1640 return (error);
1641 }
1642
1643 /*
1644 * hammer_vop_nrmdir { nch, dvp, cred }
1645 */
1646 static
1647 int
1648 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
1649 {
1650 struct hammer_transaction trans;
1651 struct hammer_inode *dip;
1652 int error;
1653
1654 dip = VTOI(ap->a_dvp);
1655 if (dip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY)
1656 return(ENOTDIR);
1657
1658 if (hammer_nohistory(dip) == 0 &&
1659 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1660 return (error);
1661 }
1662
1663 hammer_start_transaction(&trans, dip->hmp);
1664 ++hammer_stats_file_iopsw;
1665 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0);
1666 hammer_done_transaction(&trans);
1667
1668 return (error);
1669 }
1670
1671 /*
1672 * hammer_vop_setattr { vp, vap, cred }
1673 */
1674 static
1675 int
1676 hammer_vop_setattr(struct vop_setattr_args *ap)
1677 {
1678 struct hammer_transaction trans;
1679 struct vattr *vap;
1680 struct hammer_inode *ip;
1681 int modflags;
1682 int error;
1683 int truncating;
1684 int blksize;
1685 int64_t aligned_size;
1686 u_int32_t flags;
1687
1688 vap = ap->a_vap;
1689 ip = ap->a_vp->v_data;
1690 modflags = 0;
1691
1692 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1693 return(EROFS);
1694 if (ip->flags & HAMMER_INODE_RO)
1695 return (EROFS);
1696 if (hammer_nohistory(ip) == 0 &&
1697 (error = hammer_checkspace(ip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1698 return (error);
1699 }
1700
1701 hammer_start_transaction(&trans, ip->hmp);
1702 ++hammer_stats_file_iopsw;
1703 error = 0;
1704
1705 if (vap->va_flags != VNOVAL) {
1706 flags = ip->ino_data.uflags;
1707 error = vop_helper_setattr_flags(&flags, vap->va_flags,
1708 hammer_to_unix_xid(&ip->ino_data.uid),
1709 ap->a_cred);
1710 if (error == 0) {
1711 if (ip->ino_data.uflags != flags) {
1712 ip->ino_data.uflags = flags;
1713 modflags |= HAMMER_INODE_DDIRTY;
1714 }
1715 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1716 error = 0;
1717 goto done;
1718 }
1719 }
1720 goto done;
1721 }
1722 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1723 error = EPERM;
1724 goto done;
1725 }
1726 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
1727 mode_t cur_mode = ip->ino_data.mode;
1728 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
1729 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1730 uuid_t uuid_uid;
1731 uuid_t uuid_gid;
1732
1733 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
1734 ap->a_cred,
1735 &cur_uid, &cur_gid, &cur_mode);
1736 if (error == 0) {
1737 hammer_guid_to_uuid(&uuid_uid, cur_uid);
1738 hammer_guid_to_uuid(&uuid_gid, cur_gid);
1739 if (bcmp(&uuid_uid, &ip->ino_data.uid,
1740 sizeof(uuid_uid)) ||
1741 bcmp(&uuid_gid, &ip->ino_data.gid,
1742 sizeof(uuid_gid)) ||
1743 ip->ino_data.mode != cur_mode
1744 ) {
1745 ip->ino_data.uid = uuid_uid;
1746 ip->ino_data.gid = uuid_gid;
1747 ip->ino_data.mode = cur_mode;
1748 }
1749 modflags |= HAMMER_INODE_DDIRTY;
1750 }
1751 }
1752 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) {
1753 switch(ap->a_vp->v_type) {
1754 case VREG:
1755 if (vap->va_size == ip->ino_data.size)
1756 break;
1757 /*
1758 * XXX break atomicy, we can deadlock the backend
1759 * if we do not release the lock. Probably not a
1760 * big deal here.
1761 */
1762 blksize = hammer_blocksize(vap->va_size);
1763 if (vap->va_size < ip->ino_data.size) {
1764 vtruncbuf(ap->a_vp, vap->va_size, blksize);
1765 truncating = 1;
1766 } else {
1767 vnode_pager_setsize(ap->a_vp, vap->va_size);
1768 truncating = 0;
1769 }
1770 ip->ino_data.size = vap->va_size;
1771 modflags |= HAMMER_INODE_DDIRTY;
1772
1773 /*
1774 * on-media truncation is cached in the inode until
1775 * the inode is synchronized.
1776 */
1777 if (truncating) {
1778 hammer_ip_frontend_trunc(ip, vap->va_size);
1779 #ifdef DEBUG_TRUNCATE
1780 if (HammerTruncIp == NULL)
1781 HammerTruncIp = ip;
1782 #endif
1783 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
1784 ip->flags |= HAMMER_INODE_TRUNCATED;
1785 ip->trunc_off = vap->va_size;
1786 #ifdef DEBUG_TRUNCATE
1787 if (ip == HammerTruncIp)
1788 kprintf("truncate1 %016llx\n", ip->trunc_off);
1789 #endif
1790 } else if (ip->trunc_off > vap->va_size) {
1791 ip->trunc_off = vap->va_size;
1792 #ifdef DEBUG_TRUNCATE
1793 if (ip == HammerTruncIp)
1794 kprintf("truncate2 %016llx\n", ip->trunc_off);
1795 #endif
1796 } else {
1797 #ifdef DEBUG_TRUNCATE
1798 if (ip == HammerTruncIp)
1799 kprintf("truncate3 %016llx (ignored)\n", vap->va_size);
1800 #endif
1801 }
1802 }
1803
1804 /*
1805 * If truncating we have to clean out a portion of
1806 * the last block on-disk. We do this in the
1807 * front-end buffer cache.
1808 */
1809 aligned_size = (vap->va_size + (blksize - 1)) &
1810 ~(int64_t)(blksize - 1);
1811 if (truncating && vap->va_size < aligned_size) {
1812 struct buf *bp;
1813 int offset;
1814
1815 aligned_size -= blksize;
1816
1817 offset = (int)vap->va_size & (blksize - 1);
1818 error = bread(ap->a_vp, aligned_size,
1819 blksize, &bp);
1820 hammer_ip_frontend_trunc(ip, aligned_size);
1821 if (error == 0) {
1822 bzero(bp->b_data + offset,
1823 blksize - offset);
1824 /* must de-cache direct-io offset */
1825 bp->b_bio2.bio_offset = NOOFFSET;
1826 bdwrite(bp);
1827 } else {
1828 kprintf("ERROR %d\n", error);
1829 brelse(bp);
1830 }
1831 }
1832 break;
1833 case VDATABASE:
1834 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
1835 ip->flags |= HAMMER_INODE_TRUNCATED;
1836 ip->trunc_off = vap->va_size;
1837 } else if (ip->trunc_off > vap->va_size) {
1838 ip->trunc_off = vap->va_size;
1839 }
1840 hammer_ip_frontend_trunc(ip, vap->va_size);
1841 ip->ino_data.size = vap->va_size;
1842 modflags |= HAMMER_INODE_DDIRTY;
1843 break;
1844 default:
1845 error = EINVAL;
1846 goto done;
1847 }
1848 break;
1849 }
1850 if (vap->va_atime.tv_sec != VNOVAL) {
1851 ip->ino_data.atime =
1852 hammer_timespec_to_time(&vap->va_atime);
1853 modflags |= HAMMER_INODE_ATIME;
1854 }
1855 if (vap->va_mtime.tv_sec != VNOVAL) {
1856 ip->ino_data.mtime =
1857 hammer_timespec_to_time(&vap->va_mtime);
1858 modflags |= HAMMER_INODE_MTIME;
1859 }
1860 if (vap->va_mode != (mode_t)VNOVAL) {
1861 mode_t cur_mode = ip->ino_data.mode;
1862 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
1863 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1864
1865 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
1866 cur_uid, cur_gid, &cur_mode);
1867 if (error == 0 && ip->ino_data.mode != cur_mode) {
1868 ip->ino_data.mode = cur_mode;
1869 modflags |= HAMMER_INODE_DDIRTY;
1870 }
1871 }
1872 done:
1873 if (error == 0)
1874 hammer_modify_inode(ip, modflags);
1875 hammer_done_transaction(&trans);
1876 return (error);
1877 }
1878
1879 /*
1880 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
1881 */
1882 static
1883 int
1884 hammer_vop_nsymlink(struct vop_nsymlink_args *ap)
1885 {
1886 struct hammer_transaction trans;
1887 struct hammer_inode *dip;
1888 struct hammer_inode *nip;
1889 struct nchandle *nch;
1890 hammer_record_t record;
1891 int error;
1892 int bytes;
1893
1894 ap->a_vap->va_type = VLNK;
1895
1896 nch = ap->a_nch;
1897 dip = VTOI(ap->a_dvp);
1898
1899 if (dip->flags & HAMMER_INODE_RO)
1900 return (EROFS);
1901 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1902 return (error);
1903
1904 /*
1905 * Create a transaction to cover the operations we perform.
1906 */
1907 hammer_start_transaction(&trans, dip->hmp);
1908 ++hammer_stats_file_iopsw;
1909
1910 /*
1911 * Create a new filesystem object of the requested type. The
1912 * returned inode will be referenced but not locked.
1913 */
1914
1915 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1916 dip, NULL, &nip);
1917 if (error) {
1918 hammer_done_transaction(&trans);
1919 *ap->a_vpp = NULL;
1920 return (error);
1921 }
1922
1923 /*
1924 * Add a record representing the symlink. symlink stores the link
1925 * as pure data, not a string, and is no \0 terminated.
1926 */
1927 if (error == 0) {
1928 bytes = strlen(ap->a_target);
1929
1930 if (bytes <= HAMMER_INODE_BASESYMLEN) {
1931 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes);
1932 } else {
1933 record = hammer_alloc_mem_record(nip, bytes);
1934 record->type = HAMMER_MEM_RECORD_GENERAL;
1935
1936 record->leaf.base.localization = nip->obj_localization +
1937 HAMMER_LOCALIZE_MISC;
1938 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK;
1939 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX;
1940 record->leaf.data_len = bytes;
1941 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0);
1942 bcopy(ap->a_target, record->data->symlink.name, bytes);
1943 error = hammer_ip_add_record(&trans, record);
1944 }
1945
1946 /*
1947 * Set the file size to the length of the link.
1948 */
1949 if (error == 0) {
1950 nip->ino_data.size = bytes;
1951 hammer_modify_inode(nip, HAMMER_INODE_DDIRTY);
1952 }
1953 }
1954 if (error == 0)
1955 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name,
1956 nch->ncp->nc_nlen, nip);
1957
1958 /*
1959 * Finish up.
1960 */
1961 if (error) {
1962 hammer_rel_inode(nip, 0);
1963 *ap->a_vpp = NULL;
1964 } else {
1965 error = hammer_get_vnode(nip, ap->a_vpp);
1966 hammer_rel_inode(nip, 0);
1967 if (error == 0) {
1968 cache_setunresolved(ap->a_nch);
1969 cache_setvp(ap->a_nch, *ap->a_vpp);
1970 }
1971 }
1972 hammer_done_transaction(&trans);
1973 return (error);
1974 }
1975
1976 /*
1977 * hammer_vop_nwhiteout { nch, dvp, cred, flags }
1978 */
1979 static
1980 int
1981 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap)
1982 {
1983 struct hammer_transaction trans;
1984 struct hammer_inode *dip;
1985 int error;
1986
1987 dip = VTOI(ap->a_dvp);
1988
1989 if (hammer_nohistory(dip) == 0 &&
1990 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) {
1991 return (error);
1992 }
1993
1994 hammer_start_transaction(&trans, dip->hmp);
1995 ++hammer_stats_file_iopsw;
1996 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp,
1997 ap->a_cred, ap->a_flags);
1998 hammer_done_transaction(&trans);
1999
2000 return (error);
2001 }
2002
2003 /*
2004 * hammer_vop_ioctl { vp, command, data, fflag, cred }
2005 */
2006 static
2007 int
2008 hammer_vop_ioctl(struct vop_ioctl_args *ap)
2009 {
2010 struct hammer_inode *ip = ap->a_vp->v_data;
2011
2012 ++hammer_stats_file_iopsr;
2013 return(hammer_ioctl(ip, ap->a_command, ap->a_data,
2014 ap->a_fflag, ap->a_cred));
2015 }
2016
2017 static
2018 int
2019 hammer_vop_mountctl(struct vop_mountctl_args *ap)
2020 {
2021 struct mount *mp;
2022 int error;
2023
2024 mp = ap->a_head.a_ops->head.vv_mount;
2025
2026 switch(ap->a_op) {
2027 case MOUNTCTL_SET_EXPORT:
2028 if (ap->a_ctllen != sizeof(struct export_args))
2029 error = EINVAL;
2030 error = hammer_vfs_export(mp, ap->a_op,
2031 (const struct export_args *)ap->a_ctl);
2032 break;
2033 default:
2034 error = journal_mountctl(ap);
2035 break;
2036 }
2037 return(error);
2038 }
2039
2040 /*
2041 * hammer_vop_strategy { vp, bio }
2042 *
2043 * Strategy call, used for regular file read & write only. Note that the
2044 * bp may represent a cluster.
2045 *
2046 * To simplify operation and allow better optimizations in the future,
2047 * this code does not make any assumptions with regards to buffer alignment
2048 * or size.
2049 */
2050 static
2051 int
2052 hammer_vop_strategy(struct vop_strategy_args *ap)
2053 {
2054 struct buf *bp;
2055 int error;
2056
2057 bp = ap->a_bio->bio_buf;
2058
2059 switch(bp->b_cmd) {
2060 case BUF_CMD_READ:
2061 error = hammer_vop_strategy_read(ap);
2062 break;
2063 case BUF_CMD_WRITE:
2064 error = hammer_vop_strategy_write(ap);
2065 break;
2066 default:
2067 bp->b_error = error = EINVAL;
2068 bp->b_flags |= B_ERROR;
2069 biodone(ap->a_bio);
2070 break;
2071 }
2072 return (error);
2073 }
2074
2075 /*
2076 * Read from a regular file. Iterate the related records and fill in the
2077 * BIO/BUF. Gaps are zero-filled.
2078 *
2079 * The support code in hammer_object.c should be used to deal with mixed
2080 * in-memory and on-disk records.
2081 *
2082 * NOTE: Can be called from the cluster code with an oversized buf.
2083 *
2084 * XXX atime update
2085 */
2086 static
2087 int
2088 hammer_vop_strategy_read(struct vop_strategy_args *ap)
2089 {
2090 struct hammer_transaction trans;
2091 struct hammer_inode *ip;
2092 struct hammer_cursor cursor;
2093 hammer_base_elm_t base;
2094 hammer_off_t disk_offset;
2095 struct bio *bio;
2096 struct bio *nbio;
2097 struct buf *bp;
2098 int64_t rec_offset;
2099 int64_t ran_end;
2100 int64_t tmp64;
2101 int error;
2102 int boff;
2103 int roff;
2104 int n;
2105
2106 bio = ap->a_bio;
2107 bp = bio->bio_buf;
2108 ip = ap->a_vp->v_data;
2109
2110 /*
2111 * The zone-2 disk offset may have been set by the cluster code via
2112 * a BMAP operation, or else should be NOOFFSET.
2113 *
2114 * Checking the high bits for a match against zone-2 should suffice.
2115 */
2116 nbio = push_bio(bio);
2117 if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) ==
2118 HAMMER_ZONE_LARGE_DATA) {
2119 error = hammer_io_direct_read(ip->hmp, nbio, NULL);
2120 return (error);
2121 }
2122
2123 /*
2124 * Well, that sucked. Do it the hard way. If all the stars are
2125 * aligned we may still be able to issue a direct-read.
2126 */
2127 hammer_simple_transaction(&trans, ip->hmp);
2128 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2129
2130 /*
2131 * Key range (begin and end inclusive) to scan. Note that the key's
2132 * stored in the actual records represent BASE+LEN, not BASE. The
2133 * first record containing bio_offset will have a key > bio_offset.
2134 */
2135 cursor.key_beg.localization = ip->obj_localization +
2136 HAMMER_LOCALIZE_MISC;
2137 cursor.key_beg.obj_id = ip->obj_id;
2138 cursor.key_beg.create_tid = 0;
2139 cursor.key_beg.delete_tid = 0;
2140 cursor.key_beg.obj_type = 0;
2141 cursor.key_beg.key = bio->bio_offset + 1;
2142 cursor.asof = ip->obj_asof;
2143 cursor.flags |= HAMMER_CURSOR_ASOF;
2144
2145 cursor.key_end = cursor.key_beg;
2146 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2147 #if 0
2148 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) {
2149 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
2150 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
2151 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2152 } else
2153 #endif
2154 {
2155 ran_end = bio->bio_offset + bp->b_bufsize;
2156 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2157 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2158 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2159 if (tmp64 < ran_end)
2160 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2161 else
2162 cursor.key_end.key = ran_end + MAXPHYS + 1;
2163 }
2164 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2165
2166 error = hammer_ip_first(&cursor);
2167 boff = 0;
2168
2169 while (error == 0) {
2170 /*
2171 * Get the base file offset of the record. The key for
2172 * data records is (base + bytes) rather then (base).
2173 */
2174 base = &cursor.leaf->base;
2175 rec_offset = base->key - cursor.leaf->data_len;
2176
2177 /*
2178 * Calculate the gap, if any, and zero-fill it.
2179 *
2180 * n is the offset of the start of the record verses our
2181 * current seek offset in the bio.
2182 */
2183 n = (int)(rec_offset - (bio->bio_offset + boff));
2184 if (n > 0) {
2185 if (n > bp->b_bufsize - boff)
2186 n = bp->b_bufsize - boff;
2187 bzero((char *)bp->b_data + boff, n);
2188 boff += n;
2189 n = 0;
2190 }
2191
2192 /*
2193 * Calculate the data offset in the record and the number
2194 * of bytes we can copy.
2195 *
2196 * There are two degenerate cases. First, boff may already
2197 * be at bp->b_bufsize. Secondly, the data offset within
2198 * the record may exceed the record's size.
2199 */
2200 roff = -n;
2201 rec_offset += roff;
2202 n = cursor.leaf->data_len - roff;
2203 if (n <= 0) {
2204 kprintf("strategy_read: bad n=%d roff=%d\n", n, roff);
2205 n = 0;
2206 } else if (n > bp->b_bufsize - boff) {
2207 n = bp->b_bufsize - boff;
2208 }
2209
2210 /*
2211 * Deal with cached truncations. This cool bit of code
2212 * allows truncate()/ftruncate() to avoid having to sync
2213 * the file.
2214 *
2215 * If the frontend is truncated then all backend records are
2216 * subject to the frontend's truncation.
2217 *
2218 * If the backend is truncated then backend records on-disk
2219 * (but not in-memory) are subject to the backend's
2220 * truncation. In-memory records owned by the backend
2221 * represent data written after the truncation point on the
2222 * backend and must not be truncated.
2223 *
2224 * Truncate operations deal with frontend buffer cache
2225 * buffers and frontend-owned in-memory records synchronously.
2226 */
2227 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2228 if (hammer_cursor_ondisk(&cursor) ||
2229 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2230 if (ip->trunc_off <= rec_offset)
2231 n = 0;
2232 else if (ip->trunc_off < rec_offset + n)
2233 n = (int)(ip->trunc_off - rec_offset);
2234 }
2235 }
2236 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2237 if (hammer_cursor_ondisk(&cursor)) {
2238 if (ip->sync_trunc_off <= rec_offset)
2239 n = 0;
2240 else if (ip->sync_trunc_off < rec_offset + n)
2241 n = (int)(ip->sync_trunc_off - rec_offset);
2242 }
2243 }
2244
2245 /*
2246 * Try to issue a direct read into our bio if possible,
2247 * otherwise resolve the element data into a hammer_buffer
2248 * and copy.
2249 *
2250 * The buffer on-disk should be zerod past any real
2251 * truncation point, but may not be for any synthesized
2252 * truncation point from above.
2253 */
2254 disk_offset = cursor.leaf->data_offset + roff;
2255 if (boff == 0 && n == bp->b_bufsize &&
2256 hammer_cursor_ondisk(&cursor) &&
2257 (disk_offset & HAMMER_BUFMASK) == 0) {
2258 KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) ==
2259 HAMMER_ZONE_LARGE_DATA);
2260 nbio->bio_offset = disk_offset;
2261 error = hammer_io_direct_read(trans.hmp, nbio,
2262 cursor.leaf);
2263 goto done;
2264 } else if (n) {
2265 error = hammer_ip_resolve_data(&cursor);
2266 if (error == 0) {
2267 bcopy((char *)cursor.data + roff,
2268 (char *)bp->b_data + boff, n);
2269 }
2270 }
2271 if (error)
2272 break;
2273
2274 /*
2275 * Iterate until we have filled the request.
2276 */
2277 boff += n;
2278 if (boff == bp->b_bufsize)
2279 break;
2280 error = hammer_ip_next(&cursor);
2281 }
2282
2283 /*
2284 * There may have been a gap after the last record
2285 */
2286 if (error == ENOENT)
2287 error = 0;
2288 if (error == 0 && boff != bp->b_bufsize) {
2289 KKASSERT(boff < bp->b_bufsize);
2290 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
2291 /* boff = bp->b_bufsize; */
2292 }
2293 bp->b_resid = 0;
2294 bp->b_error = error;
2295 if (error)
2296 bp->b_flags |= B_ERROR;
2297 biodone(ap->a_bio);
2298
2299 done:
2300 if (cursor.node)
2301 hammer_cache_node(&ip->cache[1], cursor.node);
2302 hammer_done_cursor(&cursor);
2303 hammer_done_transaction(&trans);
2304 return(error);
2305 }
2306
2307 /*
2308 * BMAP operation - used to support cluster_read() only.
2309 *
2310 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb)
2311 *
2312 * This routine may return EOPNOTSUPP if the opration is not supported for
2313 * the specified offset. The contents of the pointer arguments do not
2314 * need to be initialized in that case.
2315 *
2316 * If a disk address is available and properly aligned return 0 with
2317 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately
2318 * to the run-length relative to that offset. Callers may assume that
2319 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently
2320 * large, so return EOPNOTSUPP if it is not sufficiently large.
2321 */
2322 static
2323 int
2324 hammer_vop_bmap(struct vop_bmap_args *ap)
2325 {
2326 struct hammer_transaction trans;
2327 struct hammer_inode *ip;
2328 struct hammer_cursor cursor;
2329 hammer_base_elm_t base;
2330 int64_t rec_offset;
2331 int64_t ran_end;
2332 int64_t tmp64;
2333 int64_t base_offset;
2334 int64_t base_disk_offset;
2335 int64_t last_offset;
2336 hammer_off_t last_disk_offset;
2337 hammer_off_t disk_offset;
2338 int rec_len;
2339 int error;
2340 int blksize;
2341
2342 ++hammer_stats_file_iopsr;
2343 ip = ap->a_vp->v_data;
2344
2345 /*
2346 * We can only BMAP regular files. We can't BMAP database files,
2347 * directories, etc.
2348 */
2349 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE)
2350 return(EOPNOTSUPP);
2351
2352 /*
2353 * bmap is typically called with runp/runb both NULL when used
2354 * for writing. We do not support BMAP for writing atm.
2355 */
2356 if (ap->a_cmd != BUF_CMD_READ)
2357 return(EOPNOTSUPP);
2358
2359 /*
2360 * Scan the B-Tree to acquire blockmap addresses, then translate
2361 * to raw addresses.
2362 */
2363 hammer_simple_transaction(&trans, ip->hmp);
2364 #if 0
2365 kprintf("bmap_beg %016llx ip->cache %p\n", ap->a_loffset, ip->cache[1]);
2366 #endif
2367 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2368
2369 /*
2370 * Key range (begin and end inclusive) to scan. Note that the key's
2371 * stored in the actual records represent BASE+LEN, not BASE. The
2372 * first record containing bio_offset will have a key > bio_offset.
2373 */
2374 cursor.key_beg.localization = ip->obj_localization +
2375 HAMMER_LOCALIZE_MISC;
2376 cursor.key_beg.obj_id = ip->obj_id;
2377 cursor.key_beg.create_tid = 0;
2378 cursor.key_beg.delete_tid = 0;
2379 cursor.key_beg.obj_type = 0;
2380 if (ap->a_runb)
2381 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1;
2382 else
2383 cursor.key_beg.key = ap->a_loffset + 1;
2384 if (cursor.key_beg.key < 0)
2385 cursor.key_beg.key = 0;
2386 cursor.asof = ip->obj_asof;
2387 cursor.flags |= HAMMER_CURSOR_ASOF;
2388
2389 cursor.key_end = cursor.key_beg;
2390 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2391
2392 ran_end = ap->a_loffset + MAXPHYS;
2393 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2394 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2395 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2396 if (tmp64 < ran_end)
2397 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2398 else
2399 cursor.key_end.key = ran_end + MAXPHYS + 1;
2400
2401 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2402
2403 error = hammer_ip_first(&cursor);
2404 base_offset = last_offset = 0;
2405 base_disk_offset = last_disk_offset = 0;
2406
2407 while (error == 0) {
2408 /*
2409 * Get the base file offset of the record. The key for
2410 * data records is (base + bytes) rather then (base).
2411 *
2412 * NOTE: rec_offset + rec_len may exceed the end-of-file.
2413 * The extra bytes should be zero on-disk and the BMAP op
2414 * should still be ok.
2415 */
2416 base = &cursor.leaf->base;
2417 rec_offset = base->key - cursor.leaf->data_len;
2418 rec_len = cursor.leaf->data_len;
2419
2420 /*
2421 * Incorporate any cached truncation.
2422 *
2423 * NOTE: Modifications to rec_len based on synthesized
2424 * truncation points remove the guarantee that any extended
2425 * data on disk is zero (since the truncations may not have
2426 * taken place on-media yet).
2427 */
2428 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2429 if (hammer_cursor_ondisk(&cursor) ||
2430 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2431 if (ip->trunc_off <= rec_offset)
2432 rec_len = 0;
2433 else if (ip->trunc_off < rec_offset + rec_len)
2434 rec_len = (int)(ip->trunc_off - rec_offset);
2435 }
2436 }
2437 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2438 if (hammer_cursor_ondisk(&cursor)) {
2439 if (ip->sync_trunc_off <= rec_offset)
2440 rec_len = 0;
2441 else if (ip->sync_trunc_off < rec_offset + rec_len)
2442 rec_len = (int)(ip->sync_trunc_off - rec_offset);
2443 }
2444 }
2445
2446 /*
2447 * Accumulate information. If we have hit a discontiguous
2448 * block reset base_offset unless we are already beyond the
2449 * requested offset. If we are, that's it, we stop.
2450 */
2451 if (error)
2452 break;
2453 if (hammer_cursor_ondisk(&cursor)) {
2454 disk_offset = cursor.leaf->data_offset;
2455 if (rec_offset != last_offset ||
2456 disk_offset != last_disk_offset) {
2457 if (rec_offset > ap->a_loffset)
2458 break;
2459 base_offset = rec_offset;
2460 base_disk_offset = disk_offset;
2461 }
2462 last_offset = rec_offset + rec_len;
2463 last_disk_offset = disk_offset + rec_len;
2464 }
2465 error = hammer_ip_next(&cursor);
2466 }
2467
2468 #if 0
2469 kprintf("BMAP %016llx: %016llx - %016llx\n",
2470 ap->a_loffset, base_offset, last_offset);
2471 kprintf("BMAP %16s: %016llx - %016llx\n",
2472 "", base_disk_offset, last_disk_offset);
2473 #endif
2474
2475 if (cursor.node) {
2476 hammer_cache_node(&ip->cache[1], cursor.node);
2477 #if 0
2478 kprintf("bmap_end2 %016llx ip->cache %p\n", ap->a_loffset, ip->cache[1]);
2479 #endif
2480 }
2481 hammer_done_cursor(&cursor);
2482 hammer_done_transaction(&trans);
2483
2484 /*
2485 * If we couldn't find any records or the records we did find were
2486 * all behind the requested offset, return failure. A forward
2487 * truncation can leave a hole w/ no on-disk records.
2488 */
2489 if (last_offset == 0 || last_offset < ap->a_loffset)
2490 return (EOPNOTSUPP);
2491
2492 /*
2493 * Figure out the block size at the requested offset and adjust
2494 * our limits so the cluster_read() does not create inappropriately
2495 * sized buffer cache buffers.
2496 */
2497 blksize = hammer_blocksize(ap->a_loffset);
2498 if (hammer_blocksize(base_offset) != blksize) {
2499 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset);
2500 }
2501 if (last_offset != ap->a_loffset &&
2502 hammer_blocksize(last_offset - 1) != blksize) {
2503 last_offset = hammer_blockdemarc(ap->a_loffset,
2504 last_offset - 1);
2505 }
2506
2507 /*
2508 * Returning EOPNOTSUPP simply prevents the direct-IO optimization
2509 * from occuring.
2510 */
2511 disk_offset = base_disk_offset + (ap->a_loffset - base_offset);
2512
2513 if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) {
2514 /*
2515 * Only large-data zones can be direct-IOd
2516 */
2517 error = EOPNOTSUPP;
2518 } else if ((disk_offset & HAMMER_BUFMASK) ||
2519 (last_offset - ap->a_loffset) < blksize) {
2520 /*
2521 * doffsetp is not aligned or the forward run size does
2522 * not cover a whole buffer, disallow the direct I/O.
2523 */
2524 error = EOPNOTSUPP;
2525 } else {
2526 /*
2527 * We're good.
2528 */
2529 *ap->a_doffsetp = disk_offset;
2530 if (ap->a_runb) {
2531 *ap->a_runb = ap->a_loffset - base_offset;
2532 KKASSERT(*ap->a_runb >= 0);
2533 }
2534 if (ap->a_runp) {
2535 *ap->a_runp = last_offset - ap->a_loffset;
2536 KKASSERT(*ap->a_runp >= 0);
2537 }
2538 error = 0;
2539 }
2540 return(error);
2541 }
2542
2543 /*
2544 * Write to a regular file. Because this is a strategy call the OS is
2545 * trying to actually get data onto the media.
2546 */
2547 static
2548 int
2549 hammer_vop_strategy_write(struct vop_strategy_args *ap)
2550 {
2551 hammer_record_t record;
2552 hammer_mount_t hmp;
2553 hammer_inode_t ip;
2554 struct bio *bio;
2555 struct buf *bp;
2556 int blksize;
2557 int bytes;
2558 int error;
2559
2560 bio = ap->a_bio;
2561 bp = bio->bio_buf;
2562 ip = ap->a_vp->v_data;
2563 hmp = ip->hmp;
2564
2565 blksize = hammer_blocksize(bio->bio_offset);
2566 KKASSERT(bp->b_bufsize == blksize);
2567
2568 if (ip->flags & HAMMER_INODE_RO) {
2569 bp->b_error = EROFS;
2570 bp->b_flags |= B_ERROR;
2571 biodone(ap->a_bio);
2572 return(EROFS);
2573 }
2574
2575 /*
2576 * Interlock with inode destruction (no in-kernel or directory
2577 * topology visibility). If we queue new IO while trying to
2578 * destroy the inode we can deadlock the vtrunc call in
2579 * hammer_inode_unloadable_check().
2580 */
2581 if (ip->flags & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) {
2582 bp->b_resid = 0;
2583 biodone(ap->a_bio);
2584 return(0);
2585 }
2586
2587 /*
2588 * Reserve space and issue a direct-write from the front-end.
2589 * NOTE: The direct_io code will hammer_bread/bcopy smaller
2590 * allocations.
2591 *
2592 * An in-memory record will be installed to reference the storage
2593 * until the flusher can get to it.
2594 *
2595 * Since we own the high level bio the front-end will not try to
2596 * do a direct-read until the write completes.
2597 *
2598 * NOTE: The only time we do not reserve a full-sized buffers
2599 * worth of data is if the file is small. We do not try to
2600 * allocate a fragment (from the small-data zone) at the end of
2601 * an otherwise large file as this can lead to wildly separated
2602 * data.
2603 */
2604 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0);
2605 KKASSERT(bio->bio_offset < ip->ino_data.size);
2606 if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2)
2607 bytes = bp->b_bufsize;
2608 else
2609 bytes = ((int)ip->ino_data.size + 15) & ~15;
2610
2611 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data,
2612 bytes, &error);
2613 if (record) {
2614 hammer_io_direct_write(hmp, record, bio);
2615 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs)
2616 hammer_flush_inode(ip, 0);
2617 } else {
2618 bp->b_bio2.bio_offset = NOOFFSET;
2619 bp->b_error = error;
2620 bp->b_flags |= B_ERROR;
2621 biodone(ap->a_bio);
2622 }
2623 return(error);
2624 }
2625
2626 /*
2627 * dounlink - disconnect a directory entry
2628 *
2629 * XXX whiteout support not really in yet
2630 */
2631 static int
2632 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
2633 struct vnode *dvp, struct ucred *cred, int flags)
2634 {
2635 struct namecache *ncp;
2636 hammer_inode_t dip;
2637 hammer_inode_t ip;
2638 struct hammer_cursor cursor;
2639 int64_t namekey;
2640 int nlen, error;
2641
2642 /*
2643 * Calculate the namekey and setup the key range for the scan. This
2644 * works kinda like a chained hash table where the lower 32 bits
2645 * of the namekey synthesize the chain.
2646 *
2647 * The key range is inclusive of both key_beg and key_end.
2648 */
2649 dip = VTOI(dvp);
2650 ncp = nch->ncp;
2651
2652 if (dip->flags & HAMMER_INODE_RO)
2653 return (EROFS);
2654
2655 namekey = hammer_directory_namekey(ncp->nc_name, ncp->nc_nlen);
2656 retry:
2657 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip);
2658 cursor.key_beg.localization = dip->obj_localization +
2659 HAMMER_LOCALIZE_MISC;
2660 cursor.key_beg.obj_id = dip->obj_id;
2661 cursor.key_beg.key = namekey;
2662 cursor.key_beg.create_tid = 0;
2663 cursor.key_beg.delete_tid = 0;
2664 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
2665 cursor.key_beg.obj_type = 0;
2666
2667 cursor.key_end = cursor.key_beg;
2668 cursor.key_end.key |= 0xFFFFFFFFULL;
2669 cursor.asof = dip->obj_asof;
2670 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
2671
2672 /*
2673 * Scan all matching records (the chain), locate the one matching
2674 * the requested path component. info->last_error contains the
2675 * error code on search termination and could be 0, ENOENT, or
2676 * something else.
2677 *
2678 * The hammer_ip_*() functions merge in-memory records with on-disk
2679 * records for the purposes of the search.
2680 */
2681 error = hammer_ip_first(&cursor);
2682
2683 while (error == 0) {
2684 error = hammer_ip_resolve_data(&cursor);
2685 if (error)
2686 break;
2687 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
2688 KKASSERT(nlen > 0);
2689 if (ncp->nc_nlen == nlen &&
2690 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
2691 break;
2692 }
2693 error = hammer_ip_next(&cursor);
2694 }
2695
2696 /*
2697 * If all is ok we have to get the inode so we can adjust nlinks.
2698 * To avoid a deadlock with the flusher we must release the inode
2699 * lock on the directory when acquiring the inode for the entry.
2700 *
2701 * If the target is a directory, it must be empty.
2702 */
2703 if (error == 0) {
2704 hammer_unlock(&cursor.ip->lock);
2705 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id,
2706 dip->hmp->asof,
2707 cursor.data->entry.localization,
2708 0, &error);
2709 hammer_lock_sh(&cursor.ip->lock);
2710 if (error == ENOENT) {
2711 kprintf("obj_id %016llx\n", cursor.data->entry.obj_id);
2712 Debugger("ENOENT unlinking object that should exist");
2713 }
2714
2715 /*
2716 * If we are trying to remove a directory the directory must
2717 * be empty.
2718 *
2719 * WARNING: hammer_ip_check_directory_empty() may have to
2720 * terminate the cursor to avoid a deadlock. It is ok to
2721 * call hammer_done_cursor() twice.
2722 */
2723 if (error == 0 && ip->ino_data.obj_type ==
2724 HAMMER_OBJTYPE_DIRECTORY) {
2725 error = hammer_ip_check_directory_empty(trans, ip);
2726 }
2727
2728 /*
2729 * Delete the directory entry.
2730 *
2731 * WARNING: hammer_ip_del_directory() may have to terminate
2732 * the cursor to avoid a deadlock. It is ok to call
2733 * hammer_done_cursor() twice.
2734 */
2735 if (error == 0) {
2736 error = hammer_ip_del_directory(trans, &cursor,
2737 dip, ip);
2738 }
2739 hammer_done_cursor(&cursor);
2740 if (error == 0) {
2741 cache_setunresolved(nch);
2742 cache_setvp(nch, NULL);
2743 /* XXX locking */
2744 if (ip->vp)
2745 cache_inval_vp(ip->vp, CINV_DESTROY);
2746 }
2747 if (ip)
2748 hammer_rel_inode(ip, 0);
2749 } else {
2750 hammer_done_cursor(&cursor);
2751 }
2752 hammer_inode_waitreclaims(dip->hmp);
2753 if (error == EDEADLK)
2754 goto retry;
2755
2756 return (error);
2757 }
2758
2759 /************************************************************************
2760 * FIFO AND SPECFS OPS *
2761 ************************************************************************
2762 *
2763 */
2764
2765 static int
2766 hammer_vop_fifoclose (struct vop_close_args *ap)
2767 {
2768 /* XXX update itimes */
2769 return (VOCALL(&fifo_vnode_vops, &ap->a_head));
2770 }
2771
2772 static int
2773 hammer_vop_fiforead (struct vop_read_args *ap)
2774 {
2775 int error;
2776
2777 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2778 /* XXX update access time */
2779 return (error);
2780 }
2781
2782 static int
2783 hammer_vop_fifowrite (struct vop_write_args *ap)
2784 {
2785 int error;
2786
2787 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2788 /* XXX update access time */
2789 return (error);
2790 }
2791
2792 static int
2793 hammer_vop_specclose (struct vop_close_args *ap)
2794 {
2795 /* XXX update itimes */
2796 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2797 }
2798
2799 static int
2800 hammer_vop_specread (struct vop_read_args *ap)
2801 {
2802 /* XXX update access time */
2803 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2804 }
2805
2806 static int
2807 hammer_vop_specwrite (struct vop_write_args *ap)
2808 {
2809 /* XXX update last change time */
2810 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2811 }
2812
DragonFly BSD