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Fix a double-flush which was occuring for every unlinked inode, resulting
[dragonfly.git] / sys / vfs / hammer / hammer_vnops.c
blob27a1eb562e6ad705fd29346c945a85807559e6d4
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 1.99 2008/09/23 22:28:56 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,
160 int flags, int isdir);
161 static int hammer_vop_strategy_read(struct vop_strategy_args *ap);
162 static int hammer_vop_strategy_write(struct vop_strategy_args *ap);
163
164 #if 0
165 static
166 int
167 hammer_vop_vnoperate(struct vop_generic_args *)
168 {
169 return (VOCALL(&hammer_vnode_vops, ap));
170 }
171 #endif
172
173 /*
174 * hammer_vop_fsync { vp, waitfor }
175 *
176 * fsync() an inode to disk and wait for it to be completely committed
177 * such that the information would not be undone if a crash occured after
178 * return.
179 */
180 static
181 int
182 hammer_vop_fsync(struct vop_fsync_args *ap)
183 {
184 hammer_inode_t ip = VTOI(ap->a_vp);
185
186 ++hammer_count_fsyncs;
187 vfsync(ap->a_vp, ap->a_waitfor, 1, NULL, NULL);
188 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
189 if (ap->a_waitfor == MNT_WAIT) {
190 vn_unlock(ap->a_vp);
191 hammer_wait_inode(ip);
192 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
193 }
194 return (ip->error);
195 }
196
197 /*
198 * hammer_vop_read { vp, uio, ioflag, cred }
199 */
200 static
201 int
202 hammer_vop_read(struct vop_read_args *ap)
203 {
204 struct hammer_transaction trans;
205 hammer_inode_t ip;
206 off_t offset;
207 struct buf *bp;
208 struct uio *uio;
209 int error;
210 int n;
211 int seqcount;
212 int ioseqcount;
213 int blksize;
214
215 if (ap->a_vp->v_type != VREG)
216 return (EINVAL);
217 ip = VTOI(ap->a_vp);
218 error = 0;
219 uio = ap->a_uio;
220
221 /*
222 * Allow the UIO's size to override the sequential heuristic.
223 */
224 blksize = hammer_blocksize(uio->uio_offset);
225 seqcount = (uio->uio_resid + (blksize - 1)) / blksize;
226 ioseqcount = ap->a_ioflag >> 16;
227 if (seqcount < ioseqcount)
228 seqcount = ioseqcount;
229
230 hammer_start_transaction(&trans, ip->hmp);
231
232 /*
233 * Access the data typically in HAMMER_BUFSIZE blocks via the
234 * buffer cache, but HAMMER may use a variable block size based
235 * on the offset.
236 */
237 while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) {
238 int64_t base_offset;
239 int64_t file_limit;
240
241 blksize = hammer_blocksize(uio->uio_offset);
242 offset = (int)uio->uio_offset & (blksize - 1);
243 base_offset = uio->uio_offset - offset;
244
245 if (hammer_cluster_enable) {
246 /*
247 * Use file_limit to prevent cluster_read() from
248 * creating buffers of the wrong block size past
249 * the demarc.
250 */
251 file_limit = ip->ino_data.size;
252 if (base_offset < HAMMER_XDEMARC &&
253 file_limit > HAMMER_XDEMARC) {
254 file_limit = HAMMER_XDEMARC;
255 }
256 error = cluster_read(ap->a_vp,
257 file_limit, base_offset,
258 blksize, MAXPHYS,
259 seqcount, &bp);
260 } else {
261 error = bread(ap->a_vp, base_offset, blksize, &bp);
262 }
263 if (error) {
264 kprintf("error %d\n", error);
265 brelse(bp);
266 break;
267 }
268
269 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
270 n = blksize - offset;
271 if (n > uio->uio_resid)
272 n = uio->uio_resid;
273 if (n > ip->ino_data.size - uio->uio_offset)
274 n = (int)(ip->ino_data.size - uio->uio_offset);
275 error = uiomove((char *)bp->b_data + offset, n, uio);
276
277 /* data has a lower priority then meta-data */
278 bp->b_flags |= B_AGE;
279 bqrelse(bp);
280 if (error)
281 break;
282 hammer_stats_file_read += n;
283 }
284 if ((ip->flags & HAMMER_INODE_RO) == 0 &&
285 (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) {
286 ip->ino_data.atime = trans.time;
287 hammer_modify_inode(ip, HAMMER_INODE_ATIME);
288 }
289 hammer_done_transaction(&trans);
290 return (error);
291 }
292
293 /*
294 * hammer_vop_write { vp, uio, ioflag, cred }
295 */
296 static
297 int
298 hammer_vop_write(struct vop_write_args *ap)
299 {
300 struct hammer_transaction trans;
301 struct hammer_inode *ip;
302 hammer_mount_t hmp;
303 struct uio *uio;
304 int offset;
305 off_t base_offset;
306 struct buf *bp;
307 int error;
308 int n;
309 int flags;
310 int delta;
311 int seqcount;
312
313 if (ap->a_vp->v_type != VREG)
314 return (EINVAL);
315 ip = VTOI(ap->a_vp);
316 hmp = ip->hmp;
317 error = 0;
318 seqcount = ap->a_ioflag >> 16;
319
320 if (ip->flags & HAMMER_INODE_RO)
321 return (EROFS);
322
323 /*
324 * Create a transaction to cover the operations we perform.
325 */
326 hammer_start_transaction(&trans, hmp);
327 uio = ap->a_uio;
328
329 /*
330 * Check append mode
331 */
332 if (ap->a_ioflag & IO_APPEND)
333 uio->uio_offset = ip->ino_data.size;
334
335 /*
336 * Check for illegal write offsets. Valid range is 0...2^63-1.
337 *
338 * NOTE: the base_off assignment is required to work around what
339 * I consider to be a GCC-4 optimization bug.
340 */
341 if (uio->uio_offset < 0) {
342 hammer_done_transaction(&trans);
343 return (EFBIG);
344 }
345 base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */
346 if (uio->uio_resid > 0 && base_offset <= 0) {
347 hammer_done_transaction(&trans);
348 return (EFBIG);
349 }
350
351 /*
352 * Access the data typically in HAMMER_BUFSIZE blocks via the
353 * buffer cache, but HAMMER may use a variable block size based
354 * on the offset.
355 */
356 while (uio->uio_resid > 0) {
357 int fixsize = 0;
358 int blksize;
359 int blkmask;
360
361 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0)
362 break;
363
364 blksize = hammer_blocksize(uio->uio_offset);
365
366 /*
367 * Do not allow HAMMER to blow out the buffer cache. Very
368 * large UIOs can lockout other processes due to bwillwrite()
369 * mechanics.
370 *
371 * The hammer inode is not locked during these operations.
372 * The vnode is locked which can interfere with the pageout
373 * daemon for non-UIO_NOCOPY writes but should not interfere
374 * with the buffer cache. Even so, we cannot afford to
375 * allow the pageout daemon to build up too many dirty buffer
376 * cache buffers.
377 */
378 /*if (((int)uio->uio_offset & (blksize - 1)) == 0)*/
379 bwillwrite(blksize);
380
381 /*
382 * Do not allow HAMMER to blow out system memory by
383 * accumulating too many records. Records are so well
384 * decoupled from the buffer cache that it is possible
385 * for userland to push data out to the media via
386 * direct-write, but build up the records queued to the
387 * backend faster then the backend can flush them out.
388 * HAMMER has hit its write limit but the frontend has
389 * no pushback to slow it down.
390 */
391 if (hmp->rsv_recs > hammer_limit_recs / 2) {
392 /*
393 * Get the inode on the flush list
394 */
395 if (ip->rsv_recs >= 64)
396 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
397 else if (ip->rsv_recs >= 16)
398 hammer_flush_inode(ip, 0);
399
400 /*
401 * Keep the flusher going if the system keeps
402 * queueing records.
403 */
404 delta = hmp->count_newrecords -
405 hmp->last_newrecords;
406 if (delta < 0 || delta > hammer_limit_recs / 2) {
407 hmp->last_newrecords = hmp->count_newrecords;
408 hammer_sync_hmp(hmp, MNT_NOWAIT);
409 }
410
411 /*
412 * If we have gotten behind start slowing
413 * down the writers.
414 */
415 delta = (hmp->rsv_recs - hammer_limit_recs) *
416 hz / hammer_limit_recs;
417 if (delta > 0)
418 tsleep(&trans, 0, "hmrslo", delta);
419 }
420
421 /*
422 * Calculate the blocksize at the current offset and figure
423 * out how much we can actually write.
424 */
425 blkmask = blksize - 1;
426 offset = (int)uio->uio_offset & blkmask;
427 base_offset = uio->uio_offset & ~(int64_t)blkmask;
428 n = blksize - offset;
429 if (n > uio->uio_resid)
430 n = uio->uio_resid;
431 if (uio->uio_offset + n > ip->ino_data.size) {
432 vnode_pager_setsize(ap->a_vp, uio->uio_offset + n);
433 fixsize = 1;
434 }
435
436 if (uio->uio_segflg == UIO_NOCOPY) {
437 /*
438 * Issuing a write with the same data backing the
439 * buffer. Instantiate the buffer to collect the
440 * backing vm pages, then read-in any missing bits.
441 *
442 * This case is used by vop_stdputpages().
443 */
444 bp = getblk(ap->a_vp, base_offset,
445 blksize, GETBLK_BHEAVY, 0);
446 if ((bp->b_flags & B_CACHE) == 0) {
447 bqrelse(bp);
448 error = bread(ap->a_vp, base_offset,
449 blksize, &bp);
450 }
451 } else if (offset == 0 && uio->uio_resid >= blksize) {
452 /*
453 * Even though we are entirely overwriting the buffer
454 * we may still have to zero it out to avoid a
455 * mmap/write visibility issue.
456 */
457 bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0);
458 if ((bp->b_flags & B_CACHE) == 0)
459 vfs_bio_clrbuf(bp);
460 } else if (base_offset >= ip->ino_data.size) {
461 /*
462 * If the base offset of the buffer is beyond the
463 * file EOF, we don't have to issue a read.
464 */
465 bp = getblk(ap->a_vp, base_offset,
466 blksize, GETBLK_BHEAVY, 0);
467 vfs_bio_clrbuf(bp);
468 } else {
469 /*
470 * Partial overwrite, read in any missing bits then
471 * replace the portion being written.
472 */
473 error = bread(ap->a_vp, base_offset, blksize, &bp);
474 if (error == 0)
475 bheavy(bp);
476 }
477 if (error == 0) {
478 error = uiomove((char *)bp->b_data + offset,
479 n, uio);
480 }
481
482 /*
483 * If we screwed up we have to undo any VM size changes we
484 * made.
485 */
486 if (error) {
487 brelse(bp);
488 if (fixsize) {
489 vtruncbuf(ap->a_vp, ip->ino_data.size,
490 hammer_blocksize(ip->ino_data.size));
491 }
492 break;
493 }
494 hammer_stats_file_write += n;
495 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
496 if (ip->ino_data.size < uio->uio_offset) {
497 ip->ino_data.size = uio->uio_offset;
498 flags = HAMMER_INODE_DDIRTY;
499 vnode_pager_setsize(ap->a_vp, ip->ino_data.size);
500 } else {
501 flags = 0;
502 }
503 ip->ino_data.mtime = trans.time;
504 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS;
505 hammer_modify_inode(ip, flags);
506
507 /*
508 * Once we dirty the buffer any cached zone-X offset
509 * becomes invalid. HAMMER NOTE: no-history mode cannot
510 * allow overwriting over the same data sector unless
511 * we provide UNDOs for the old data, which we don't.
512 */
513 bp->b_bio2.bio_offset = NOOFFSET;
514
515 /*
516 * Final buffer disposition.
517 */
518 bp->b_flags |= B_AGE;
519 if (ap->a_ioflag & IO_SYNC) {
520 bwrite(bp);
521 } else if (ap->a_ioflag & IO_DIRECT) {
522 bawrite(bp);
523 } else {
524 bdwrite(bp);
525 }
526 }
527 hammer_done_transaction(&trans);
528 return (error);
529 }
530
531 /*
532 * hammer_vop_access { vp, mode, cred }
533 */
534 static
535 int
536 hammer_vop_access(struct vop_access_args *ap)
537 {
538 struct hammer_inode *ip = VTOI(ap->a_vp);
539 uid_t uid;
540 gid_t gid;
541 int error;
542
543 ++hammer_stats_file_iopsr;
544 uid = hammer_to_unix_xid(&ip->ino_data.uid);
545 gid = hammer_to_unix_xid(&ip->ino_data.gid);
546
547 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
548 ip->ino_data.uflags);
549 return (error);
550 }
551
552 /*
553 * hammer_vop_advlock { vp, id, op, fl, flags }
554 */
555 static
556 int
557 hammer_vop_advlock(struct vop_advlock_args *ap)
558 {
559 hammer_inode_t ip = VTOI(ap->a_vp);
560
561 return (lf_advlock(ap, &ip->advlock, ip->ino_data.size));
562 }
563
564 /*
565 * hammer_vop_close { vp, fflag }
566 */
567 static
568 int
569 hammer_vop_close(struct vop_close_args *ap)
570 {
571 /*hammer_inode_t ip = VTOI(ap->a_vp);*/
572 return (vop_stdclose(ap));
573 }
574
575 /*
576 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
577 *
578 * The operating system has already ensured that the directory entry
579 * does not exist and done all appropriate namespace locking.
580 */
581 static
582 int
583 hammer_vop_ncreate(struct vop_ncreate_args *ap)
584 {
585 struct hammer_transaction trans;
586 struct hammer_inode *dip;
587 struct hammer_inode *nip;
588 struct nchandle *nch;
589 int error;
590
591 nch = ap->a_nch;
592 dip = VTOI(ap->a_dvp);
593
594 if (dip->flags & HAMMER_INODE_RO)
595 return (EROFS);
596 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
597 return (error);
598
599 /*
600 * Create a transaction to cover the operations we perform.
601 */
602 hammer_start_transaction(&trans, dip->hmp);
603 ++hammer_stats_file_iopsw;
604
605 /*
606 * Create a new filesystem object of the requested type. The
607 * returned inode will be referenced and shared-locked to prevent
608 * it from being moved to the flusher.
609 */
610
611 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
612 dip, NULL, &nip);
613 if (error) {
614 hkprintf("hammer_create_inode error %d\n", error);
615 hammer_done_transaction(&trans);
616 *ap->a_vpp = NULL;
617 return (error);
618 }
619
620 /*
621 * Add the new filesystem object to the directory. This will also
622 * bump the inode's link count.
623 */
624 error = hammer_ip_add_directory(&trans, dip,
625 nch->ncp->nc_name, nch->ncp->nc_nlen,
626 nip);
627 if (error)
628 hkprintf("hammer_ip_add_directory error %d\n", error);
629
630 /*
631 * Finish up.
632 */
633 if (error) {
634 hammer_rel_inode(nip, 0);
635 hammer_done_transaction(&trans);
636 *ap->a_vpp = NULL;
637 } else {
638 error = hammer_get_vnode(nip, ap->a_vpp);
639 hammer_done_transaction(&trans);
640 hammer_rel_inode(nip, 0);
641 if (error == 0) {
642 cache_setunresolved(ap->a_nch);
643 cache_setvp(ap->a_nch, *ap->a_vpp);
644 }
645 }
646 return (error);
647 }
648
649 /*
650 * hammer_vop_getattr { vp, vap }
651 *
652 * Retrieve an inode's attribute information. When accessing inodes
653 * historically we fake the atime field to ensure consistent results.
654 * The atime field is stored in the B-Tree element and allowed to be
655 * updated without cycling the element.
656 */
657 static
658 int
659 hammer_vop_getattr(struct vop_getattr_args *ap)
660 {
661 struct hammer_inode *ip = VTOI(ap->a_vp);
662 struct vattr *vap = ap->a_vap;
663
664 /*
665 * We want the fsid to be different when accessing a filesystem
666 * with different as-of's so programs like diff don't think
667 * the files are the same.
668 *
669 * We also want the fsid to be the same when comparing snapshots,
670 * or when comparing mirrors (which might be backed by different
671 * physical devices). HAMMER fsids are based on the PFS's
672 * shared_uuid field.
673 *
674 * XXX there is a chance of collision here. The va_fsid reported
675 * by stat is different from the more involved fsid used in the
676 * mount structure.
677 */
678 ++hammer_stats_file_iopsr;
679 vap->va_fsid = ip->pfsm->fsid_udev ^ (u_int32_t)ip->obj_asof ^
680 (u_int32_t)(ip->obj_asof >> 32);
681
682 vap->va_fileid = ip->ino_leaf.base.obj_id;
683 vap->va_mode = ip->ino_data.mode;
684 vap->va_nlink = ip->ino_data.nlinks;
685 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
686 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
687 vap->va_rmajor = 0;
688 vap->va_rminor = 0;
689 vap->va_size = ip->ino_data.size;
690
691 /*
692 * Special case for @@PFS softlinks. The actual size of the
693 * expanded softlink is "@@0x%016llx:%05d" == 26 bytes.
694 */
695 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK &&
696 ip->ino_data.size == 10 &&
697 ip->obj_asof == HAMMER_MAX_TID &&
698 ip->obj_localization == 0 &&
699 strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) {
700 vap->va_size = 26;
701 }
702
703 /*
704 * We must provide a consistent atime and mtime for snapshots
705 * so people can do a 'tar cf - ... | md5' on them and get
706 * consistent results.
707 */
708 if (ip->flags & HAMMER_INODE_RO) {
709 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime);
710 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime);
711 } else {
712 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime);
713 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime);
714 }
715 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
716 vap->va_flags = ip->ino_data.uflags;
717 vap->va_gen = 1; /* hammer inums are unique for all time */
718 vap->va_blocksize = HAMMER_BUFSIZE;
719 if (ip->ino_data.size >= HAMMER_XDEMARC) {
720 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) &
721 ~HAMMER_XBUFMASK64;
722 } else if (ip->ino_data.size > HAMMER_BUFSIZE / 2) {
723 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) &
724 ~HAMMER_BUFMASK64;
725 } else {
726 vap->va_bytes = (ip->ino_data.size + 15) & ~15;
727 }
728 vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type);
729 vap->va_filerev = 0; /* XXX */
730 /* mtime uniquely identifies any adjustments made to the file XXX */
731 vap->va_fsmid = ip->ino_data.mtime;
732 vap->va_uid_uuid = ip->ino_data.uid;
733 vap->va_gid_uuid = ip->ino_data.gid;
734 vap->va_fsid_uuid = ip->hmp->fsid;
735 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
736 VA_FSID_UUID_VALID;
737
738 switch (ip->ino_data.obj_type) {
739 case HAMMER_OBJTYPE_CDEV:
740 case HAMMER_OBJTYPE_BDEV:
741 vap->va_rmajor = ip->ino_data.rmajor;
742 vap->va_rminor = ip->ino_data.rminor;
743 break;
744 default:
745 break;
746 }
747 return(0);
748 }
749
750 /*
751 * hammer_vop_nresolve { nch, dvp, cred }
752 *
753 * Locate the requested directory entry.
754 */
755 static
756 int
757 hammer_vop_nresolve(struct vop_nresolve_args *ap)
758 {
759 struct hammer_transaction trans;
760 struct namecache *ncp;
761 hammer_inode_t dip;
762 hammer_inode_t ip;
763 hammer_tid_t asof;
764 struct hammer_cursor cursor;
765 struct vnode *vp;
766 int64_t namekey;
767 int error;
768 int i;
769 int nlen;
770 int flags;
771 int ispfs;
772 int64_t obj_id;
773 u_int32_t localization;
774
775 /*
776 * Misc initialization, plus handle as-of name extensions. Look for
777 * the '@@' extension. Note that as-of files and directories cannot
778 * be modified.
779 */
780 dip = VTOI(ap->a_dvp);
781 ncp = ap->a_nch->ncp;
782 asof = dip->obj_asof;
783 nlen = ncp->nc_nlen;
784 flags = dip->flags & HAMMER_INODE_RO;
785 ispfs = 0;
786
787 hammer_simple_transaction(&trans, dip->hmp);
788 ++hammer_stats_file_iopsr;
789
790 for (i = 0; i < nlen; ++i) {
791 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
792 asof = hammer_str_to_tid(ncp->nc_name + i + 2,
793 &ispfs, &localization);
794 if (asof != HAMMER_MAX_TID)
795 flags |= HAMMER_INODE_RO;
796 break;
797 }
798 }
799 nlen = i;
800
801 /*
802 * If this is a PFS softlink we dive into the PFS
803 */
804 if (ispfs && nlen == 0) {
805 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT,
806 asof, localization,
807 flags, &error);
808 if (error == 0) {
809 error = hammer_get_vnode(ip, &vp);
810 hammer_rel_inode(ip, 0);
811 } else {
812 vp = NULL;
813 }
814 if (error == 0) {
815 vn_unlock(vp);
816 cache_setvp(ap->a_nch, vp);
817 vrele(vp);
818 }
819 goto done;
820 }
821
822 /*
823 * If there is no path component the time extension is relative to
824 * dip.
825 */
826 if (nlen == 0) {
827 ip = hammer_get_inode(&trans, dip, dip->obj_id,
828 asof, dip->obj_localization,
829 flags, &error);
830 if (error == 0) {
831 error = hammer_get_vnode(ip, &vp);
832 hammer_rel_inode(ip, 0);
833 } else {
834 vp = NULL;
835 }
836 if (error == 0) {
837 vn_unlock(vp);
838 cache_setvp(ap->a_nch, vp);
839 vrele(vp);
840 }
841 goto done;
842 }
843
844 /*
845 * Calculate the namekey and setup the key range for the scan. This
846 * works kinda like a chained hash table where the lower 32 bits
847 * of the namekey synthesize the chain.
848 *
849 * The key range is inclusive of both key_beg and key_end.
850 */
851 namekey = hammer_directory_namekey(ncp->nc_name, nlen);
852
853 error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip);
854 cursor.key_beg.localization = dip->obj_localization +
855 HAMMER_LOCALIZE_MISC;
856 cursor.key_beg.obj_id = dip->obj_id;
857 cursor.key_beg.key = namekey;
858 cursor.key_beg.create_tid = 0;
859 cursor.key_beg.delete_tid = 0;
860 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
861 cursor.key_beg.obj_type = 0;
862
863 cursor.key_end = cursor.key_beg;
864 cursor.key_end.key |= 0xFFFFFFFFULL;
865 cursor.asof = asof;
866 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
867
868 /*
869 * Scan all matching records (the chain), locate the one matching
870 * the requested path component.
871 *
872 * The hammer_ip_*() functions merge in-memory records with on-disk
873 * records for the purposes of the search.
874 */
875 obj_id = 0;
876 localization = HAMMER_DEF_LOCALIZATION;
877
878 if (error == 0) {
879 error = hammer_ip_first(&cursor);
880 while (error == 0) {
881 error = hammer_ip_resolve_data(&cursor);
882 if (error)
883 break;
884 if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF &&
885 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
886 obj_id = cursor.data->entry.obj_id;
887 localization = cursor.data->entry.localization;
888 break;
889 }
890 error = hammer_ip_next(&cursor);
891 }
892 }
893 hammer_done_cursor(&cursor);
894 if (error == 0) {
895 ip = hammer_get_inode(&trans, dip, obj_id,
896 asof, localization,
897 flags, &error);
898 if (error == 0) {
899 error = hammer_get_vnode(ip, &vp);
900 hammer_rel_inode(ip, 0);
901 } else {
902 vp = NULL;
903 }
904 if (error == 0) {
905 vn_unlock(vp);
906 cache_setvp(ap->a_nch, vp);
907 vrele(vp);
908 }
909 } else if (error == ENOENT) {
910 cache_setvp(ap->a_nch, NULL);
911 }
912 done:
913 hammer_done_transaction(&trans);
914 return (error);
915 }
916
917 /*
918 * hammer_vop_nlookupdotdot { dvp, vpp, cred }
919 *
920 * Locate the parent directory of a directory vnode.
921 *
922 * dvp is referenced but not locked. *vpp must be returned referenced and
923 * locked. A parent_obj_id of 0 does not necessarily indicate that we are
924 * at the root, instead it could indicate that the directory we were in was
925 * removed.
926 *
927 * NOTE: as-of sequences are not linked into the directory structure. If
928 * we are at the root with a different asof then the mount point, reload
929 * the same directory with the mount point's asof. I'm not sure what this
930 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not
931 * get confused, but it hasn't been tested.
932 */
933 static
934 int
935 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
936 {
937 struct hammer_transaction trans;
938 struct hammer_inode *dip;
939 struct hammer_inode *ip;
940 int64_t parent_obj_id;
941 u_int32_t parent_obj_localization;
942 hammer_tid_t asof;
943 int error;
944
945 dip = VTOI(ap->a_dvp);
946 asof = dip->obj_asof;
947
948 /*
949 * Whos are parent? This could be the root of a pseudo-filesystem
950 * whos parent is in another localization domain.
951 */
952 parent_obj_id = dip->ino_data.parent_obj_id;
953 if (dip->obj_id == HAMMER_OBJID_ROOT)
954 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization;
955 else
956 parent_obj_localization = dip->obj_localization;
957
958 if (parent_obj_id == 0) {
959 if (dip->obj_id == HAMMER_OBJID_ROOT &&
960 asof != dip->hmp->asof) {
961 parent_obj_id = dip->obj_id;
962 asof = dip->hmp->asof;
963 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK);
964 ksnprintf(*ap->a_fakename, 19, "0x%016llx",
965 dip->obj_asof);
966 } else {
967 *ap->a_vpp = NULL;
968 return ENOENT;
969 }
970 }
971
972 hammer_simple_transaction(&trans, dip->hmp);
973 ++hammer_stats_file_iopsr;
974
975 ip = hammer_get_inode(&trans, dip, parent_obj_id,
976 asof, parent_obj_localization,
977 dip->flags, &error);
978 if (ip) {
979 error = hammer_get_vnode(ip, ap->a_vpp);
980 hammer_rel_inode(ip, 0);
981 } else {
982 *ap->a_vpp = NULL;
983 }
984 hammer_done_transaction(&trans);
985 return (error);
986 }
987
988 /*
989 * hammer_vop_nlink { nch, dvp, vp, cred }
990 */
991 static
992 int
993 hammer_vop_nlink(struct vop_nlink_args *ap)
994 {
995 struct hammer_transaction trans;
996 struct hammer_inode *dip;
997 struct hammer_inode *ip;
998 struct nchandle *nch;
999 int error;
1000
1001 if (ap->a_dvp->v_mount != ap->a_vp->v_mount)
1002 return(EXDEV);
1003
1004 nch = ap->a_nch;
1005 dip = VTOI(ap->a_dvp);
1006 ip = VTOI(ap->a_vp);
1007
1008 if (dip->obj_localization != ip->obj_localization)
1009 return(EXDEV);
1010
1011 if (dip->flags & HAMMER_INODE_RO)
1012 return (EROFS);
1013 if (ip->flags & HAMMER_INODE_RO)
1014 return (EROFS);
1015 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1016 return (error);
1017
1018 /*
1019 * Create a transaction to cover the operations we perform.
1020 */
1021 hammer_start_transaction(&trans, dip->hmp);
1022 ++hammer_stats_file_iopsw;
1023
1024 /*
1025 * Add the filesystem object to the directory. Note that neither
1026 * dip nor ip are referenced or locked, but their vnodes are
1027 * referenced. This function will bump the inode's link count.
1028 */
1029 error = hammer_ip_add_directory(&trans, dip,
1030 nch->ncp->nc_name, nch->ncp->nc_nlen,
1031 ip);
1032
1033 /*
1034 * Finish up.
1035 */
1036 if (error == 0) {
1037 cache_setunresolved(nch);
1038 cache_setvp(nch, ap->a_vp);
1039 }
1040 hammer_done_transaction(&trans);
1041 return (error);
1042 }
1043
1044 /*
1045 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
1046 *
1047 * The operating system has already ensured that the directory entry
1048 * does not exist and done all appropriate namespace locking.
1049 */
1050 static
1051 int
1052 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
1053 {
1054 struct hammer_transaction trans;
1055 struct hammer_inode *dip;
1056 struct hammer_inode *nip;
1057 struct nchandle *nch;
1058 int error;
1059
1060 nch = ap->a_nch;
1061 dip = VTOI(ap->a_dvp);
1062
1063 if (dip->flags & HAMMER_INODE_RO)
1064 return (EROFS);
1065 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1066 return (error);
1067
1068 /*
1069 * Create a transaction to cover the operations we perform.
1070 */
1071 hammer_start_transaction(&trans, dip->hmp);
1072 ++hammer_stats_file_iopsw;
1073
1074 /*
1075 * Create a new filesystem object of the requested type. The
1076 * returned inode will be referenced but not locked.
1077 */
1078 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1079 dip, NULL, &nip);
1080 if (error) {
1081 hkprintf("hammer_mkdir error %d\n", error);
1082 hammer_done_transaction(&trans);
1083 *ap->a_vpp = NULL;
1084 return (error);
1085 }
1086 /*
1087 * Add the new filesystem object to the directory. This will also
1088 * bump the inode's link count.
1089 */
1090 error = hammer_ip_add_directory(&trans, dip,
1091 nch->ncp->nc_name, nch->ncp->nc_nlen,
1092 nip);
1093 if (error)
1094 hkprintf("hammer_mkdir (add) error %d\n", error);
1095
1096 /*
1097 * Finish up.
1098 */
1099 if (error) {
1100 hammer_rel_inode(nip, 0);
1101 *ap->a_vpp = NULL;
1102 } else {
1103 error = hammer_get_vnode(nip, ap->a_vpp);
1104 hammer_rel_inode(nip, 0);
1105 if (error == 0) {
1106 cache_setunresolved(ap->a_nch);
1107 cache_setvp(ap->a_nch, *ap->a_vpp);
1108 }
1109 }
1110 hammer_done_transaction(&trans);
1111 return (error);
1112 }
1113
1114 /*
1115 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
1116 *
1117 * The operating system has already ensured that the directory entry
1118 * does not exist and done all appropriate namespace locking.
1119 */
1120 static
1121 int
1122 hammer_vop_nmknod(struct vop_nmknod_args *ap)
1123 {
1124 struct hammer_transaction trans;
1125 struct hammer_inode *dip;
1126 struct hammer_inode *nip;
1127 struct nchandle *nch;
1128 int error;
1129
1130 nch = ap->a_nch;
1131 dip = VTOI(ap->a_dvp);
1132
1133 if (dip->flags & HAMMER_INODE_RO)
1134 return (EROFS);
1135 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1136 return (error);
1137
1138 /*
1139 * Create a transaction to cover the operations we perform.
1140 */
1141 hammer_start_transaction(&trans, dip->hmp);
1142 ++hammer_stats_file_iopsw;
1143
1144 /*
1145 * Create a new filesystem object of the requested type. The
1146 * returned inode will be referenced but not locked.
1147 *
1148 * If mknod specifies a directory a pseudo-fs is created.
1149 */
1150 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1151 dip, NULL, &nip);
1152 if (error) {
1153 hammer_done_transaction(&trans);
1154 *ap->a_vpp = NULL;
1155 return (error);
1156 }
1157
1158 /*
1159 * Add the new filesystem object to the directory. This will also
1160 * bump the inode's link count.
1161 */
1162 error = hammer_ip_add_directory(&trans, dip,
1163 nch->ncp->nc_name, nch->ncp->nc_nlen,
1164 nip);
1165
1166 /*
1167 * Finish up.
1168 */
1169 if (error) {
1170 hammer_rel_inode(nip, 0);
1171 *ap->a_vpp = NULL;
1172 } else {
1173 error = hammer_get_vnode(nip, ap->a_vpp);
1174 hammer_rel_inode(nip, 0);
1175 if (error == 0) {
1176 cache_setunresolved(ap->a_nch);
1177 cache_setvp(ap->a_nch, *ap->a_vpp);
1178 }
1179 }
1180 hammer_done_transaction(&trans);
1181 return (error);
1182 }
1183
1184 /*
1185 * hammer_vop_open { vp, mode, cred, fp }
1186 */
1187 static
1188 int
1189 hammer_vop_open(struct vop_open_args *ap)
1190 {
1191 hammer_inode_t ip;
1192
1193 ++hammer_stats_file_iopsr;
1194 ip = VTOI(ap->a_vp);
1195
1196 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO))
1197 return (EROFS);
1198 return(vop_stdopen(ap));
1199 }
1200
1201 /*
1202 * hammer_vop_pathconf { vp, name, retval }
1203 */
1204 static
1205 int
1206 hammer_vop_pathconf(struct vop_pathconf_args *ap)
1207 {
1208 return EOPNOTSUPP;
1209 }
1210
1211 /*
1212 * hammer_vop_print { vp }
1213 */
1214 static
1215 int
1216 hammer_vop_print(struct vop_print_args *ap)
1217 {
1218 return EOPNOTSUPP;
1219 }
1220
1221 /*
1222 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
1223 */
1224 static
1225 int
1226 hammer_vop_readdir(struct vop_readdir_args *ap)
1227 {
1228 struct hammer_transaction trans;
1229 struct hammer_cursor cursor;
1230 struct hammer_inode *ip;
1231 struct uio *uio;
1232 hammer_base_elm_t base;
1233 int error;
1234 int cookie_index;
1235 int ncookies;
1236 off_t *cookies;
1237 off_t saveoff;
1238 int r;
1239 int dtype;
1240
1241 ++hammer_stats_file_iopsr;
1242 ip = VTOI(ap->a_vp);
1243 uio = ap->a_uio;
1244 saveoff = uio->uio_offset;
1245
1246 if (ap->a_ncookies) {
1247 ncookies = uio->uio_resid / 16 + 1;
1248 if (ncookies > 1024)
1249 ncookies = 1024;
1250 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
1251 cookie_index = 0;
1252 } else {
1253 ncookies = -1;
1254 cookies = NULL;
1255 cookie_index = 0;
1256 }
1257
1258 hammer_simple_transaction(&trans, ip->hmp);
1259
1260 /*
1261 * Handle artificial entries
1262 */
1263 error = 0;
1264 if (saveoff == 0) {
1265 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
1266 if (r)
1267 goto done;
1268 if (cookies)
1269 cookies[cookie_index] = saveoff;
1270 ++saveoff;
1271 ++cookie_index;
1272 if (cookie_index == ncookies)
1273 goto done;
1274 }
1275 if (saveoff == 1) {
1276 if (ip->ino_data.parent_obj_id) {
1277 r = vop_write_dirent(&error, uio,
1278 ip->ino_data.parent_obj_id,
1279 DT_DIR, 2, "..");
1280 } else {
1281 r = vop_write_dirent(&error, uio,
1282 ip->obj_id, DT_DIR, 2, "..");
1283 }
1284 if (r)
1285 goto done;
1286 if (cookies)
1287 cookies[cookie_index] = saveoff;
1288 ++saveoff;
1289 ++cookie_index;
1290 if (cookie_index == ncookies)
1291 goto done;
1292 }
1293
1294 /*
1295 * Key range (begin and end inclusive) to scan. Directory keys
1296 * directly translate to a 64 bit 'seek' position.
1297 */
1298 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1299 cursor.key_beg.localization = ip->obj_localization +
1300 HAMMER_LOCALIZE_MISC;
1301 cursor.key_beg.obj_id = ip->obj_id;
1302 cursor.key_beg.create_tid = 0;
1303 cursor.key_beg.delete_tid = 0;
1304 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1305 cursor.key_beg.obj_type = 0;
1306 cursor.key_beg.key = saveoff;
1307
1308 cursor.key_end = cursor.key_beg;
1309 cursor.key_end.key = HAMMER_MAX_KEY;
1310 cursor.asof = ip->obj_asof;
1311 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1312
1313 error = hammer_ip_first(&cursor);
1314
1315 while (error == 0) {
1316 error = hammer_ip_resolve_data(&cursor);
1317 if (error)
1318 break;
1319 base = &cursor.leaf->base;
1320 saveoff = base->key;
1321 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF);
1322
1323 if (base->obj_id != ip->obj_id)
1324 panic("readdir: bad record at %p", cursor.node);
1325
1326 /*
1327 * Convert pseudo-filesystems into softlinks
1328 */
1329 dtype = hammer_get_dtype(cursor.leaf->base.obj_type);
1330 r = vop_write_dirent(
1331 &error, uio, cursor.data->entry.obj_id,
1332 dtype,
1333 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF ,
1334 (void *)cursor.data->entry.name);
1335 if (r)
1336 break;
1337 ++saveoff;
1338 if (cookies)
1339 cookies[cookie_index] = base->key;
1340 ++cookie_index;
1341 if (cookie_index == ncookies)
1342 break;
1343 error = hammer_ip_next(&cursor);
1344 }
1345 hammer_done_cursor(&cursor);
1346
1347 done:
1348 hammer_done_transaction(&trans);
1349
1350 if (ap->a_eofflag)
1351 *ap->a_eofflag = (error == ENOENT);
1352 uio->uio_offset = saveoff;
1353 if (error && cookie_index == 0) {
1354 if (error == ENOENT)
1355 error = 0;
1356 if (cookies) {
1357 kfree(cookies, M_TEMP);
1358 *ap->a_ncookies = 0;
1359 *ap->a_cookies = NULL;
1360 }
1361 } else {
1362 if (error == ENOENT)
1363 error = 0;
1364 if (cookies) {
1365 *ap->a_ncookies = cookie_index;
1366 *ap->a_cookies = cookies;
1367 }
1368 }
1369 return(error);
1370 }
1371
1372 /*
1373 * hammer_vop_readlink { vp, uio, cred }
1374 */
1375 static
1376 int
1377 hammer_vop_readlink(struct vop_readlink_args *ap)
1378 {
1379 struct hammer_transaction trans;
1380 struct hammer_cursor cursor;
1381 struct hammer_inode *ip;
1382 char buf[32];
1383 u_int32_t localization;
1384 hammer_pseudofs_inmem_t pfsm;
1385 int error;
1386
1387 ip = VTOI(ap->a_vp);
1388
1389 /*
1390 * Shortcut if the symlink data was stuffed into ino_data.
1391 *
1392 * Also expand special "@@PFS%05d" softlinks (expansion only
1393 * occurs for non-historical (current) accesses made from the
1394 * primary filesystem).
1395 */
1396 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) {
1397 char *ptr;
1398 int bytes;
1399
1400 ptr = ip->ino_data.ext.symlink;
1401 bytes = (int)ip->ino_data.size;
1402 if (bytes == 10 &&
1403 ip->obj_asof == HAMMER_MAX_TID &&
1404 ip->obj_localization == 0 &&
1405 strncmp(ptr, "@@PFS", 5) == 0) {
1406 hammer_simple_transaction(&trans, ip->hmp);
1407 bcopy(ptr + 5, buf, 5);
1408 buf[5] = 0;
1409 localization = strtoul(buf, NULL, 10) << 16;
1410 pfsm = hammer_load_pseudofs(&trans, localization,
1411 &error);
1412 if (error == 0) {
1413 if (pfsm->pfsd.mirror_flags &
1414 HAMMER_PFSD_SLAVE) {
1415 ksnprintf(buf, sizeof(buf),
1416 "@@0x%016llx:%05d",
1417 pfsm->pfsd.sync_end_tid,
1418 localization >> 16);
1419 } else {
1420 ksnprintf(buf, sizeof(buf),
1421 "@@0x%016llx:%05d",
1422 HAMMER_MAX_TID,
1423 localization >> 16);
1424 }
1425 ptr = buf;
1426 bytes = strlen(buf);
1427 }
1428 if (pfsm)
1429 hammer_rel_pseudofs(trans.hmp, pfsm);
1430 hammer_done_transaction(&trans);
1431 }
1432 error = uiomove(ptr, bytes, ap->a_uio);
1433 return(error);
1434 }
1435
1436 /*
1437 * Long version
1438 */
1439 hammer_simple_transaction(&trans, ip->hmp);
1440 ++hammer_stats_file_iopsr;
1441 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1442
1443 /*
1444 * Key range (begin and end inclusive) to scan. Directory keys
1445 * directly translate to a 64 bit 'seek' position.
1446 */
1447 cursor.key_beg.localization = ip->obj_localization +
1448 HAMMER_LOCALIZE_MISC;
1449 cursor.key_beg.obj_id = ip->obj_id;
1450 cursor.key_beg.create_tid = 0;
1451 cursor.key_beg.delete_tid = 0;
1452 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1453 cursor.key_beg.obj_type = 0;
1454 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1455 cursor.asof = ip->obj_asof;
1456 cursor.flags |= HAMMER_CURSOR_ASOF;
1457
1458 error = hammer_ip_lookup(&cursor);
1459 if (error == 0) {
1460 error = hammer_ip_resolve_data(&cursor);
1461 if (error == 0) {
1462 KKASSERT(cursor.leaf->data_len >=
1463 HAMMER_SYMLINK_NAME_OFF);
1464 error = uiomove(cursor.data->symlink.name,
1465 cursor.leaf->data_len -
1466 HAMMER_SYMLINK_NAME_OFF,
1467 ap->a_uio);
1468 }
1469 }
1470 hammer_done_cursor(&cursor);
1471 hammer_done_transaction(&trans);
1472 return(error);
1473 }
1474
1475 /*
1476 * hammer_vop_nremove { nch, dvp, cred }
1477 */
1478 static
1479 int
1480 hammer_vop_nremove(struct vop_nremove_args *ap)
1481 {
1482 struct hammer_transaction trans;
1483 struct hammer_inode *dip;
1484 int error;
1485
1486 dip = VTOI(ap->a_dvp);
1487
1488 if (hammer_nohistory(dip) == 0 &&
1489 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1490 return (error);
1491 }
1492
1493 hammer_start_transaction(&trans, dip->hmp);
1494 ++hammer_stats_file_iopsw;
1495 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0);
1496 hammer_done_transaction(&trans);
1497
1498 return (error);
1499 }
1500
1501 /*
1502 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1503 */
1504 static
1505 int
1506 hammer_vop_nrename(struct vop_nrename_args *ap)
1507 {
1508 struct hammer_transaction trans;
1509 struct namecache *fncp;
1510 struct namecache *tncp;
1511 struct hammer_inode *fdip;
1512 struct hammer_inode *tdip;
1513 struct hammer_inode *ip;
1514 struct hammer_cursor cursor;
1515 int64_t namekey;
1516 int nlen, error;
1517
1518 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount)
1519 return(EXDEV);
1520 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
1521 return(EXDEV);
1522
1523 fdip = VTOI(ap->a_fdvp);
1524 tdip = VTOI(ap->a_tdvp);
1525 fncp = ap->a_fnch->ncp;
1526 tncp = ap->a_tnch->ncp;
1527 ip = VTOI(fncp->nc_vp);
1528 KKASSERT(ip != NULL);
1529
1530 if (fdip->obj_localization != tdip->obj_localization)
1531 return(EXDEV);
1532 if (fdip->obj_localization != ip->obj_localization)
1533 return(EXDEV);
1534
1535 if (fdip->flags & HAMMER_INODE_RO)
1536 return (EROFS);
1537 if (tdip->flags & HAMMER_INODE_RO)
1538 return (EROFS);
1539 if (ip->flags & HAMMER_INODE_RO)
1540 return (EROFS);
1541 if ((error = hammer_checkspace(fdip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1542 return (error);
1543
1544 hammer_start_transaction(&trans, fdip->hmp);
1545 ++hammer_stats_file_iopsw;
1546
1547 /*
1548 * Remove tncp from the target directory and then link ip as
1549 * tncp. XXX pass trans to dounlink
1550 *
1551 * Force the inode sync-time to match the transaction so it is
1552 * in-sync with the creation of the target directory entry.
1553 */
1554 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp,
1555 ap->a_cred, 0, -1);
1556 if (error == 0 || error == ENOENT) {
1557 error = hammer_ip_add_directory(&trans, tdip,
1558 tncp->nc_name, tncp->nc_nlen,
1559 ip);
1560 if (error == 0) {
1561 ip->ino_data.parent_obj_id = tdip->obj_id;
1562 hammer_modify_inode(ip, HAMMER_INODE_DDIRTY);
1563 }
1564 }
1565 if (error)
1566 goto failed; /* XXX */
1567
1568 /*
1569 * Locate the record in the originating directory and remove it.
1570 *
1571 * Calculate the namekey and setup the key range for the scan. This
1572 * works kinda like a chained hash table where the lower 32 bits
1573 * of the namekey synthesize the chain.
1574 *
1575 * The key range is inclusive of both key_beg and key_end.
1576 */
1577 namekey = hammer_directory_namekey(fncp->nc_name, fncp->nc_nlen);
1578 retry:
1579 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip);
1580 cursor.key_beg.localization = fdip->obj_localization +
1581 HAMMER_LOCALIZE_MISC;
1582 cursor.key_beg.obj_id = fdip->obj_id;
1583 cursor.key_beg.key = namekey;
1584 cursor.key_beg.create_tid = 0;
1585 cursor.key_beg.delete_tid = 0;
1586 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1587 cursor.key_beg.obj_type = 0;
1588
1589 cursor.key_end = cursor.key_beg;
1590 cursor.key_end.key |= 0xFFFFFFFFULL;
1591 cursor.asof = fdip->obj_asof;
1592 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1593
1594 /*
1595 * Scan all matching records (the chain), locate the one matching
1596 * the requested path component.
1597 *
1598 * The hammer_ip_*() functions merge in-memory records with on-disk
1599 * records for the purposes of the search.
1600 */
1601 error = hammer_ip_first(&cursor);
1602 while (error == 0) {
1603 if (hammer_ip_resolve_data(&cursor) != 0)
1604 break;
1605 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
1606 KKASSERT(nlen > 0);
1607 if (fncp->nc_nlen == nlen &&
1608 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) {
1609 break;
1610 }
1611 error = hammer_ip_next(&cursor);
1612 }
1613
1614 /*
1615 * If all is ok we have to get the inode so we can adjust nlinks.
1616 *
1617 * WARNING: hammer_ip_del_directory() may have to terminate the
1618 * cursor to avoid a recursion. It's ok to call hammer_done_cursor()
1619 * twice.
1620 */
1621 if (error == 0)
1622 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
1623
1624 /*
1625 * XXX A deadlock here will break rename's atomicy for the purposes
1626 * of crash recovery.
1627 */
1628 if (error == EDEADLK) {
1629 hammer_done_cursor(&cursor);
1630 goto retry;
1631 }
1632
1633 /*
1634 * Cleanup and tell the kernel that the rename succeeded.
1635 */
1636 hammer_done_cursor(&cursor);
1637 if (error == 0)
1638 cache_rename(ap->a_fnch, ap->a_tnch);
1639
1640 failed:
1641 hammer_done_transaction(&trans);
1642 return (error);
1643 }
1644
1645 /*
1646 * hammer_vop_nrmdir { nch, dvp, cred }
1647 */
1648 static
1649 int
1650 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
1651 {
1652 struct hammer_transaction trans;
1653 struct hammer_inode *dip;
1654 int error;
1655
1656 dip = VTOI(ap->a_dvp);
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, 1);
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, -1);
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 else
2031 error = hammer_vfs_export(mp, ap->a_op,
2032 (const struct export_args *)ap->a_ctl);
2033 break;
2034 default:
2035 error = journal_mountctl(ap);
2036 break;
2037 }
2038 return(error);
2039 }
2040
2041 /*
2042 * hammer_vop_strategy { vp, bio }
2043 *
2044 * Strategy call, used for regular file read & write only. Note that the
2045 * bp may represent a cluster.
2046 *
2047 * To simplify operation and allow better optimizations in the future,
2048 * this code does not make any assumptions with regards to buffer alignment
2049 * or size.
2050 */
2051 static
2052 int
2053 hammer_vop_strategy(struct vop_strategy_args *ap)
2054 {
2055 struct buf *bp;
2056 int error;
2057
2058 bp = ap->a_bio->bio_buf;
2059
2060 switch(bp->b_cmd) {
2061 case BUF_CMD_READ:
2062 error = hammer_vop_strategy_read(ap);
2063 break;
2064 case BUF_CMD_WRITE:
2065 error = hammer_vop_strategy_write(ap);
2066 break;
2067 default:
2068 bp->b_error = error = EINVAL;
2069 bp->b_flags |= B_ERROR;
2070 biodone(ap->a_bio);
2071 break;
2072 }
2073 return (error);
2074 }
2075
2076 /*
2077 * Read from a regular file. Iterate the related records and fill in the
2078 * BIO/BUF. Gaps are zero-filled.
2079 *
2080 * The support code in hammer_object.c should be used to deal with mixed
2081 * in-memory and on-disk records.
2082 *
2083 * NOTE: Can be called from the cluster code with an oversized buf.
2084 *
2085 * XXX atime update
2086 */
2087 static
2088 int
2089 hammer_vop_strategy_read(struct vop_strategy_args *ap)
2090 {
2091 struct hammer_transaction trans;
2092 struct hammer_inode *ip;
2093 struct hammer_cursor cursor;
2094 hammer_base_elm_t base;
2095 hammer_off_t disk_offset;
2096 struct bio *bio;
2097 struct bio *nbio;
2098 struct buf *bp;
2099 int64_t rec_offset;
2100 int64_t ran_end;
2101 int64_t tmp64;
2102 int error;
2103 int boff;
2104 int roff;
2105 int n;
2106
2107 bio = ap->a_bio;
2108 bp = bio->bio_buf;
2109 ip = ap->a_vp->v_data;
2110
2111 /*
2112 * The zone-2 disk offset may have been set by the cluster code via
2113 * a BMAP operation, or else should be NOOFFSET.
2114 *
2115 * Checking the high bits for a match against zone-2 should suffice.
2116 */
2117 nbio = push_bio(bio);
2118 if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) ==
2119 HAMMER_ZONE_LARGE_DATA) {
2120 error = hammer_io_direct_read(ip->hmp, nbio, NULL);
2121 return (error);
2122 }
2123
2124 /*
2125 * Well, that sucked. Do it the hard way. If all the stars are
2126 * aligned we may still be able to issue a direct-read.
2127 */
2128 hammer_simple_transaction(&trans, ip->hmp);
2129 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2130
2131 /*
2132 * Key range (begin and end inclusive) to scan. Note that the key's
2133 * stored in the actual records represent BASE+LEN, not BASE. The
2134 * first record containing bio_offset will have a key > bio_offset.
2135 */
2136 cursor.key_beg.localization = ip->obj_localization +
2137 HAMMER_LOCALIZE_MISC;
2138 cursor.key_beg.obj_id = ip->obj_id;
2139 cursor.key_beg.create_tid = 0;
2140 cursor.key_beg.delete_tid = 0;
2141 cursor.key_beg.obj_type = 0;
2142 cursor.key_beg.key = bio->bio_offset + 1;
2143 cursor.asof = ip->obj_asof;
2144 cursor.flags |= HAMMER_CURSOR_ASOF;
2145
2146 cursor.key_end = cursor.key_beg;
2147 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2148 #if 0
2149 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) {
2150 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
2151 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
2152 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2153 } else
2154 #endif
2155 {
2156 ran_end = bio->bio_offset + bp->b_bufsize;
2157 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2158 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2159 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2160 if (tmp64 < ran_end)
2161 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2162 else
2163 cursor.key_end.key = ran_end + MAXPHYS + 1;
2164 }
2165 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2166
2167 error = hammer_ip_first(&cursor);
2168 boff = 0;
2169
2170 while (error == 0) {
2171 /*
2172 * Get the base file offset of the record. The key for
2173 * data records is (base + bytes) rather then (base).
2174 */
2175 base = &cursor.leaf->base;
2176 rec_offset = base->key - cursor.leaf->data_len;
2177
2178 /*
2179 * Calculate the gap, if any, and zero-fill it.
2180 *
2181 * n is the offset of the start of the record verses our
2182 * current seek offset in the bio.
2183 */
2184 n = (int)(rec_offset - (bio->bio_offset + boff));
2185 if (n > 0) {
2186 if (n > bp->b_bufsize - boff)
2187 n = bp->b_bufsize - boff;
2188 bzero((char *)bp->b_data + boff, n);
2189 boff += n;
2190 n = 0;
2191 }
2192
2193 /*
2194 * Calculate the data offset in the record and the number
2195 * of bytes we can copy.
2196 *
2197 * There are two degenerate cases. First, boff may already
2198 * be at bp->b_bufsize. Secondly, the data offset within
2199 * the record may exceed the record's size.
2200 */
2201 roff = -n;
2202 rec_offset += roff;
2203 n = cursor.leaf->data_len - roff;
2204 if (n <= 0) {
2205 kprintf("strategy_read: bad n=%d roff=%d\n", n, roff);
2206 n = 0;
2207 } else if (n > bp->b_bufsize - boff) {
2208 n = bp->b_bufsize - boff;
2209 }
2210
2211 /*
2212 * Deal with cached truncations. This cool bit of code
2213 * allows truncate()/ftruncate() to avoid having to sync
2214 * the file.
2215 *
2216 * If the frontend is truncated then all backend records are
2217 * subject to the frontend's truncation.
2218 *
2219 * If the backend is truncated then backend records on-disk
2220 * (but not in-memory) are subject to the backend's
2221 * truncation. In-memory records owned by the backend
2222 * represent data written after the truncation point on the
2223 * backend and must not be truncated.
2224 *
2225 * Truncate operations deal with frontend buffer cache
2226 * buffers and frontend-owned in-memory records synchronously.
2227 */
2228 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2229 if (hammer_cursor_ondisk(&cursor) ||
2230 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2231 if (ip->trunc_off <= rec_offset)
2232 n = 0;
2233 else if (ip->trunc_off < rec_offset + n)
2234 n = (int)(ip->trunc_off - rec_offset);
2235 }
2236 }
2237 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2238 if (hammer_cursor_ondisk(&cursor)) {
2239 if (ip->sync_trunc_off <= rec_offset)
2240 n = 0;
2241 else if (ip->sync_trunc_off < rec_offset + n)
2242 n = (int)(ip->sync_trunc_off - rec_offset);
2243 }
2244 }
2245
2246 /*
2247 * Try to issue a direct read into our bio if possible,
2248 * otherwise resolve the element data into a hammer_buffer
2249 * and copy.
2250 *
2251 * The buffer on-disk should be zerod past any real
2252 * truncation point, but may not be for any synthesized
2253 * truncation point from above.
2254 */
2255 disk_offset = cursor.leaf->data_offset + roff;
2256 if (boff == 0 && n == bp->b_bufsize &&
2257 hammer_cursor_ondisk(&cursor) &&
2258 (disk_offset & HAMMER_BUFMASK) == 0) {
2259 KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) ==
2260 HAMMER_ZONE_LARGE_DATA);
2261 nbio->bio_offset = disk_offset;
2262 error = hammer_io_direct_read(trans.hmp, nbio,
2263 cursor.leaf);
2264 goto done;
2265 } else if (n) {
2266 error = hammer_ip_resolve_data(&cursor);
2267 if (error == 0) {
2268 bcopy((char *)cursor.data + roff,
2269 (char *)bp->b_data + boff, n);
2270 }
2271 }
2272 if (error)
2273 break;
2274
2275 /*
2276 * Iterate until we have filled the request.
2277 */
2278 boff += n;
2279 if (boff == bp->b_bufsize)
2280 break;
2281 error = hammer_ip_next(&cursor);
2282 }
2283
2284 /*
2285 * There may have been a gap after the last record
2286 */
2287 if (error == ENOENT)
2288 error = 0;
2289 if (error == 0 && boff != bp->b_bufsize) {
2290 KKASSERT(boff < bp->b_bufsize);
2291 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
2292 /* boff = bp->b_bufsize; */
2293 }
2294 bp->b_resid = 0;
2295 bp->b_error = error;
2296 if (error)
2297 bp->b_flags |= B_ERROR;
2298 biodone(ap->a_bio);
2299
2300 done:
2301 if (cursor.node)
2302 hammer_cache_node(&ip->cache[1], cursor.node);
2303 hammer_done_cursor(&cursor);
2304 hammer_done_transaction(&trans);
2305 return(error);
2306 }
2307
2308 /*
2309 * BMAP operation - used to support cluster_read() only.
2310 *
2311 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb)
2312 *
2313 * This routine may return EOPNOTSUPP if the opration is not supported for
2314 * the specified offset. The contents of the pointer arguments do not
2315 * need to be initialized in that case.
2316 *
2317 * If a disk address is available and properly aligned return 0 with
2318 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately
2319 * to the run-length relative to that offset. Callers may assume that
2320 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently
2321 * large, so return EOPNOTSUPP if it is not sufficiently large.
2322 */
2323 static
2324 int
2325 hammer_vop_bmap(struct vop_bmap_args *ap)
2326 {
2327 struct hammer_transaction trans;
2328 struct hammer_inode *ip;
2329 struct hammer_cursor cursor;
2330 hammer_base_elm_t base;
2331 int64_t rec_offset;
2332 int64_t ran_end;
2333 int64_t tmp64;
2334 int64_t base_offset;
2335 int64_t base_disk_offset;
2336 int64_t last_offset;
2337 hammer_off_t last_disk_offset;
2338 hammer_off_t disk_offset;
2339 int rec_len;
2340 int error;
2341 int blksize;
2342
2343 ++hammer_stats_file_iopsr;
2344 ip = ap->a_vp->v_data;
2345
2346 /*
2347 * We can only BMAP regular files. We can't BMAP database files,
2348 * directories, etc.
2349 */
2350 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE)
2351 return(EOPNOTSUPP);
2352
2353 /*
2354 * bmap is typically called with runp/runb both NULL when used
2355 * for writing. We do not support BMAP for writing atm.
2356 */
2357 if (ap->a_cmd != BUF_CMD_READ)
2358 return(EOPNOTSUPP);
2359
2360 /*
2361 * Scan the B-Tree to acquire blockmap addresses, then translate
2362 * to raw addresses.
2363 */
2364 hammer_simple_transaction(&trans, ip->hmp);
2365 #if 0
2366 kprintf("bmap_beg %016llx ip->cache %p\n", ap->a_loffset, ip->cache[1]);
2367 #endif
2368 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2369
2370 /*
2371 * Key range (begin and end inclusive) to scan. Note that the key's
2372 * stored in the actual records represent BASE+LEN, not BASE. The
2373 * first record containing bio_offset will have a key > bio_offset.
2374 */
2375 cursor.key_beg.localization = ip->obj_localization +
2376 HAMMER_LOCALIZE_MISC;
2377 cursor.key_beg.obj_id = ip->obj_id;
2378 cursor.key_beg.create_tid = 0;
2379 cursor.key_beg.delete_tid = 0;
2380 cursor.key_beg.obj_type = 0;
2381 if (ap->a_runb)
2382 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1;
2383 else
2384 cursor.key_beg.key = ap->a_loffset + 1;
2385 if (cursor.key_beg.key < 0)
2386 cursor.key_beg.key = 0;
2387 cursor.asof = ip->obj_asof;
2388 cursor.flags |= HAMMER_CURSOR_ASOF;
2389
2390 cursor.key_end = cursor.key_beg;
2391 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2392
2393 ran_end = ap->a_loffset + MAXPHYS;
2394 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2395 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2396 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2397 if (tmp64 < ran_end)
2398 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2399 else
2400 cursor.key_end.key = ran_end + MAXPHYS + 1;
2401
2402 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2403
2404 error = hammer_ip_first(&cursor);
2405 base_offset = last_offset = 0;
2406 base_disk_offset = last_disk_offset = 0;
2407
2408 while (error == 0) {
2409 /*
2410 * Get the base file offset of the record. The key for
2411 * data records is (base + bytes) rather then (base).
2412 *
2413 * NOTE: rec_offset + rec_len may exceed the end-of-file.
2414 * The extra bytes should be zero on-disk and the BMAP op
2415 * should still be ok.
2416 */
2417 base = &cursor.leaf->base;
2418 rec_offset = base->key - cursor.leaf->data_len;
2419 rec_len = cursor.leaf->data_len;
2420
2421 /*
2422 * Incorporate any cached truncation.
2423 *
2424 * NOTE: Modifications to rec_len based on synthesized
2425 * truncation points remove the guarantee that any extended
2426 * data on disk is zero (since the truncations may not have
2427 * taken place on-media yet).
2428 */
2429 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2430 if (hammer_cursor_ondisk(&cursor) ||
2431 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2432 if (ip->trunc_off <= rec_offset)
2433 rec_len = 0;
2434 else if (ip->trunc_off < rec_offset + rec_len)
2435 rec_len = (int)(ip->trunc_off - rec_offset);
2436 }
2437 }
2438 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2439 if (hammer_cursor_ondisk(&cursor)) {
2440 if (ip->sync_trunc_off <= rec_offset)
2441 rec_len = 0;
2442 else if (ip->sync_trunc_off < rec_offset + rec_len)
2443 rec_len = (int)(ip->sync_trunc_off - rec_offset);
2444 }
2445 }
2446
2447 /*
2448 * Accumulate information. If we have hit a discontiguous
2449 * block reset base_offset unless we are already beyond the
2450 * requested offset. If we are, that's it, we stop.
2451 */
2452 if (error)
2453 break;
2454 if (hammer_cursor_ondisk(&cursor)) {
2455 disk_offset = cursor.leaf->data_offset;
2456 if (rec_offset != last_offset ||
2457 disk_offset != last_disk_offset) {
2458 if (rec_offset > ap->a_loffset)
2459 break;
2460 base_offset = rec_offset;
2461 base_disk_offset = disk_offset;
2462 }
2463 last_offset = rec_offset + rec_len;
2464 last_disk_offset = disk_offset + rec_len;
2465 }
2466 error = hammer_ip_next(&cursor);
2467 }
2468
2469 #if 0
2470 kprintf("BMAP %016llx: %016llx - %016llx\n",
2471 ap->a_loffset, base_offset, last_offset);
2472 kprintf("BMAP %16s: %016llx - %016llx\n",
2473 "", base_disk_offset, last_disk_offset);
2474 #endif
2475
2476 if (cursor.node) {
2477 hammer_cache_node(&ip->cache[1], cursor.node);
2478 #if 0
2479 kprintf("bmap_end2 %016llx ip->cache %p\n", ap->a_loffset, ip->cache[1]);
2480 #endif
2481 }
2482 hammer_done_cursor(&cursor);
2483 hammer_done_transaction(&trans);
2484
2485 /*
2486 * If we couldn't find any records or the records we did find were
2487 * all behind the requested offset, return failure. A forward
2488 * truncation can leave a hole w/ no on-disk records.
2489 */
2490 if (last_offset == 0 || last_offset < ap->a_loffset)
2491 return (EOPNOTSUPP);
2492
2493 /*
2494 * Figure out the block size at the requested offset and adjust
2495 * our limits so the cluster_read() does not create inappropriately
2496 * sized buffer cache buffers.
2497 */
2498 blksize = hammer_blocksize(ap->a_loffset);
2499 if (hammer_blocksize(base_offset) != blksize) {
2500 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset);
2501 }
2502 if (last_offset != ap->a_loffset &&
2503 hammer_blocksize(last_offset - 1) != blksize) {
2504 last_offset = hammer_blockdemarc(ap->a_loffset,
2505 last_offset - 1);
2506 }
2507
2508 /*
2509 * Returning EOPNOTSUPP simply prevents the direct-IO optimization
2510 * from occuring.
2511 */
2512 disk_offset = base_disk_offset + (ap->a_loffset - base_offset);
2513
2514 if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) {
2515 /*
2516 * Only large-data zones can be direct-IOd
2517 */
2518 error = EOPNOTSUPP;
2519 } else if ((disk_offset & HAMMER_BUFMASK) ||
2520 (last_offset - ap->a_loffset) < blksize) {
2521 /*
2522 * doffsetp is not aligned or the forward run size does
2523 * not cover a whole buffer, disallow the direct I/O.
2524 */
2525 error = EOPNOTSUPP;
2526 } else {
2527 /*
2528 * We're good.
2529 */
2530 *ap->a_doffsetp = disk_offset;
2531 if (ap->a_runb) {
2532 *ap->a_runb = ap->a_loffset - base_offset;
2533 KKASSERT(*ap->a_runb >= 0);
2534 }
2535 if (ap->a_runp) {
2536 *ap->a_runp = last_offset - ap->a_loffset;
2537 KKASSERT(*ap->a_runp >= 0);
2538 }
2539 error = 0;
2540 }
2541 return(error);
2542 }
2543
2544 /*
2545 * Write to a regular file. Because this is a strategy call the OS is
2546 * trying to actually get data onto the media.
2547 */
2548 static
2549 int
2550 hammer_vop_strategy_write(struct vop_strategy_args *ap)
2551 {
2552 hammer_record_t record;
2553 hammer_mount_t hmp;
2554 hammer_inode_t ip;
2555 struct bio *bio;
2556 struct buf *bp;
2557 int blksize;
2558 int bytes;
2559 int error;
2560
2561 bio = ap->a_bio;
2562 bp = bio->bio_buf;
2563 ip = ap->a_vp->v_data;
2564 hmp = ip->hmp;
2565
2566 blksize = hammer_blocksize(bio->bio_offset);
2567 KKASSERT(bp->b_bufsize == blksize);
2568
2569 if (ip->flags & HAMMER_INODE_RO) {
2570 bp->b_error = EROFS;
2571 bp->b_flags |= B_ERROR;
2572 biodone(ap->a_bio);
2573 return(EROFS);
2574 }
2575
2576 /*
2577 * Interlock with inode destruction (no in-kernel or directory
2578 * topology visibility). If we queue new IO while trying to
2579 * destroy the inode we can deadlock the vtrunc call in
2580 * hammer_inode_unloadable_check().
2581 *
2582 * Besides, there's no point flushing a bp associated with an
2583 * inode that is being destroyed on-media and has no kernel
2584 * references.
2585 */
2586 if ((ip->flags | ip->sync_flags) &
2587 (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) {
2588 bp->b_resid = 0;
2589 biodone(ap->a_bio);
2590 return(0);
2591 }
2592
2593 /*
2594 * Reserve space and issue a direct-write from the front-end.
2595 * NOTE: The direct_io code will hammer_bread/bcopy smaller
2596 * allocations.
2597 *
2598 * An in-memory record will be installed to reference the storage
2599 * until the flusher can get to it.
2600 *
2601 * Since we own the high level bio the front-end will not try to
2602 * do a direct-read until the write completes.
2603 *
2604 * NOTE: The only time we do not reserve a full-sized buffers
2605 * worth of data is if the file is small. We do not try to
2606 * allocate a fragment (from the small-data zone) at the end of
2607 * an otherwise large file as this can lead to wildly separated
2608 * data.
2609 */
2610 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0);
2611 KKASSERT(bio->bio_offset < ip->ino_data.size);
2612 if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2)
2613 bytes = bp->b_bufsize;
2614 else
2615 bytes = ((int)ip->ino_data.size + 15) & ~15;
2616
2617 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data,
2618 bytes, &error);
2619 if (record) {
2620 hammer_io_direct_write(hmp, record, bio);
2621 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs)
2622 hammer_flush_inode(ip, 0);
2623 } else {
2624 bp->b_bio2.bio_offset = NOOFFSET;
2625 bp->b_error = error;
2626 bp->b_flags |= B_ERROR;
2627 biodone(ap->a_bio);
2628 }
2629 return(error);
2630 }
2631
2632 /*
2633 * dounlink - disconnect a directory entry
2634 *
2635 * XXX whiteout support not really in yet
2636 */
2637 static int
2638 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
2639 struct vnode *dvp, struct ucred *cred,
2640 int flags, int isdir)
2641 {
2642 struct namecache *ncp;
2643 hammer_inode_t dip;
2644 hammer_inode_t ip;
2645 struct hammer_cursor cursor;
2646 int64_t namekey;
2647 int nlen, error;
2648
2649 /*
2650 * Calculate the namekey and setup the key range for the scan. This
2651 * works kinda like a chained hash table where the lower 32 bits
2652 * of the namekey synthesize the chain.
2653 *
2654 * The key range is inclusive of both key_beg and key_end.
2655 */
2656 dip = VTOI(dvp);
2657 ncp = nch->ncp;
2658
2659 if (dip->flags & HAMMER_INODE_RO)
2660 return (EROFS);
2661
2662 namekey = hammer_directory_namekey(ncp->nc_name, ncp->nc_nlen);
2663 retry:
2664 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip);
2665 cursor.key_beg.localization = dip->obj_localization +
2666 HAMMER_LOCALIZE_MISC;
2667 cursor.key_beg.obj_id = dip->obj_id;
2668 cursor.key_beg.key = namekey;
2669 cursor.key_beg.create_tid = 0;
2670 cursor.key_beg.delete_tid = 0;
2671 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
2672 cursor.key_beg.obj_type = 0;
2673
2674 cursor.key_end = cursor.key_beg;
2675 cursor.key_end.key |= 0xFFFFFFFFULL;
2676 cursor.asof = dip->obj_asof;
2677 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
2678
2679 /*
2680 * Scan all matching records (the chain), locate the one matching
2681 * the requested path component. info->last_error contains the
2682 * error code on search termination and could be 0, ENOENT, or
2683 * something else.
2684 *
2685 * The hammer_ip_*() functions merge in-memory records with on-disk
2686 * records for the purposes of the search.
2687 */
2688 error = hammer_ip_first(&cursor);
2689
2690 while (error == 0) {
2691 error = hammer_ip_resolve_data(&cursor);
2692 if (error)
2693 break;
2694 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
2695 KKASSERT(nlen > 0);
2696 if (ncp->nc_nlen == nlen &&
2697 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
2698 break;
2699 }
2700 error = hammer_ip_next(&cursor);
2701 }
2702
2703 /*
2704 * If all is ok we have to get the inode so we can adjust nlinks.
2705 * To avoid a deadlock with the flusher we must release the inode
2706 * lock on the directory when acquiring the inode for the entry.
2707 *
2708 * If the target is a directory, it must be empty.
2709 */
2710 if (error == 0) {
2711 hammer_unlock(&cursor.ip->lock);
2712 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id,
2713 dip->hmp->asof,
2714 cursor.data->entry.localization,
2715 0, &error);
2716 hammer_lock_sh(&cursor.ip->lock);
2717 if (error == ENOENT) {
2718 kprintf("obj_id %016llx\n", cursor.data->entry.obj_id);
2719 Debugger("ENOENT unlinking object that should exist");
2720 }
2721
2722 /*
2723 * If isdir >= 0 we validate that the entry is or is not a
2724 * directory. If isdir < 0 we don't care.
2725 */
2726 if (error == 0 && isdir >= 0) {
2727 if (isdir &&
2728 ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) {
2729 error = ENOTDIR;
2730 } else if (isdir == 0 &&
2731 ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
2732 error = EISDIR;
2733 }
2734 }
2735
2736 /*
2737 * If we are trying to remove a directory the directory must
2738 * be empty.
2739 *
2740 * WARNING: hammer_ip_check_directory_empty() may have to
2741 * terminate the cursor to avoid a deadlock. It is ok to
2742 * call hammer_done_cursor() twice.
2743 */
2744 if (error == 0 && ip->ino_data.obj_type ==
2745 HAMMER_OBJTYPE_DIRECTORY) {
2746 error = hammer_ip_check_directory_empty(trans, ip);
2747 }
2748
2749 /*
2750 * Delete the directory entry.
2751 *
2752 * WARNING: hammer_ip_del_directory() may have to terminate
2753 * the cursor to avoid a deadlock. It is ok to call
2754 * hammer_done_cursor() twice.
2755 */
2756 if (error == 0) {
2757 error = hammer_ip_del_directory(trans, &cursor,
2758 dip, ip);
2759 }
2760 hammer_done_cursor(&cursor);
2761 if (error == 0) {
2762 cache_setunresolved(nch);
2763 cache_setvp(nch, NULL);
2764 /* XXX locking */
2765 if (ip->vp)
2766 cache_inval_vp(ip->vp, CINV_DESTROY);
2767 }
2768 if (ip)
2769 hammer_rel_inode(ip, 0);
2770 } else {
2771 hammer_done_cursor(&cursor);
2772 }
2773 if (error == EDEADLK)
2774 goto retry;
2775
2776 return (error);
2777 }
2778
2779 /************************************************************************
2780 * FIFO AND SPECFS OPS *
2781 ************************************************************************
2782 *
2783 */
2784
2785 static int
2786 hammer_vop_fifoclose (struct vop_close_args *ap)
2787 {
2788 /* XXX update itimes */
2789 return (VOCALL(&fifo_vnode_vops, &ap->a_head));
2790 }
2791
2792 static int
2793 hammer_vop_fiforead (struct vop_read_args *ap)
2794 {
2795 int error;
2796
2797 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2798 /* XXX update access time */
2799 return (error);
2800 }
2801
2802 static int
2803 hammer_vop_fifowrite (struct vop_write_args *ap)
2804 {
2805 int error;
2806
2807 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2808 /* XXX update access time */
2809 return (error);
2810 }
2811
2812 static int
2813 hammer_vop_specclose (struct vop_close_args *ap)
2814 {
2815 /* XXX update itimes */
2816 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2817 }
2818
2819 static int
2820 hammer_vop_specread (struct vop_read_args *ap)
2821 {
2822 /* XXX update access time */
2823 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2824 }
2825
2826 static int
2827 hammer_vop_specwrite (struct vop_write_args *ap)
2828 {
2829 /* XXX update last change time */
2830 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2831 }
2832
DragonFly BSD