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HAMMER 27/many: Major surgery - change allocation model
[dragonfly.git] / sys / vfs / hammer / hammer_vnops.c
blob4d76beb100b345efe4d90fb5c491704cd5872590
1 /*
2 * Copyright (c) 2007 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 1.29 2008/02/08 08:31:00 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_nsymlink(struct vop_nsymlink_args *);
79 static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *);
80 static int hammer_vop_ioctl(struct vop_ioctl_args *);
81 static int hammer_vop_mountctl(struct vop_mountctl_args *);
82
83 static int hammer_vop_fifoclose (struct vop_close_args *);
84 static int hammer_vop_fiforead (struct vop_read_args *);
85 static int hammer_vop_fifowrite (struct vop_write_args *);
86
87 static int hammer_vop_specclose (struct vop_close_args *);
88 static int hammer_vop_specread (struct vop_read_args *);
89 static int hammer_vop_specwrite (struct vop_write_args *);
90
91 struct vop_ops hammer_vnode_vops = {
92 .vop_default = vop_defaultop,
93 .vop_fsync = hammer_vop_fsync,
94 .vop_getpages = vop_stdgetpages,
95 .vop_putpages = vop_stdputpages,
96 .vop_read = hammer_vop_read,
97 .vop_write = hammer_vop_write,
98 .vop_access = hammer_vop_access,
99 .vop_advlock = hammer_vop_advlock,
100 .vop_close = hammer_vop_close,
101 .vop_ncreate = hammer_vop_ncreate,
102 .vop_getattr = hammer_vop_getattr,
103 .vop_inactive = hammer_vop_inactive,
104 .vop_reclaim = hammer_vop_reclaim,
105 .vop_nresolve = hammer_vop_nresolve,
106 .vop_nlookupdotdot = hammer_vop_nlookupdotdot,
107 .vop_nlink = hammer_vop_nlink,
108 .vop_nmkdir = hammer_vop_nmkdir,
109 .vop_nmknod = hammer_vop_nmknod,
110 .vop_open = hammer_vop_open,
111 .vop_pathconf = hammer_vop_pathconf,
112 .vop_print = hammer_vop_print,
113 .vop_readdir = hammer_vop_readdir,
114 .vop_readlink = hammer_vop_readlink,
115 .vop_nremove = hammer_vop_nremove,
116 .vop_nrename = hammer_vop_nrename,
117 .vop_nrmdir = hammer_vop_nrmdir,
118 .vop_setattr = hammer_vop_setattr,
119 .vop_strategy = hammer_vop_strategy,
120 .vop_nsymlink = hammer_vop_nsymlink,
121 .vop_nwhiteout = hammer_vop_nwhiteout,
122 .vop_ioctl = hammer_vop_ioctl,
123 .vop_mountctl = hammer_vop_mountctl
124 };
125
126 struct vop_ops hammer_spec_vops = {
127 .vop_default = spec_vnoperate,
128 .vop_fsync = hammer_vop_fsync,
129 .vop_read = hammer_vop_specread,
130 .vop_write = hammer_vop_specwrite,
131 .vop_access = hammer_vop_access,
132 .vop_close = hammer_vop_specclose,
133 .vop_getattr = hammer_vop_getattr,
134 .vop_inactive = hammer_vop_inactive,
135 .vop_reclaim = hammer_vop_reclaim,
136 .vop_setattr = hammer_vop_setattr
137 };
138
139 struct vop_ops hammer_fifo_vops = {
140 .vop_default = fifo_vnoperate,
141 .vop_fsync = hammer_vop_fsync,
142 .vop_read = hammer_vop_fiforead,
143 .vop_write = hammer_vop_fifowrite,
144 .vop_access = hammer_vop_access,
145 .vop_close = hammer_vop_fifoclose,
146 .vop_getattr = hammer_vop_getattr,
147 .vop_inactive = hammer_vop_inactive,
148 .vop_reclaim = hammer_vop_reclaim,
149 .vop_setattr = hammer_vop_setattr
150 };
151
152 static int hammer_dounlink(struct nchandle *nch, struct vnode *dvp,
153 struct ucred *cred, int flags);
154 static int hammer_vop_strategy_read(struct vop_strategy_args *ap);
155 static int hammer_vop_strategy_write(struct vop_strategy_args *ap);
156
157 #if 0
158 static
159 int
160 hammer_vop_vnoperate(struct vop_generic_args *)
161 {
162 return (VOCALL(&hammer_vnode_vops, ap));
163 }
164 #endif
165
166 /*
167 * hammer_vop_fsync { vp, waitfor }
168 */
169 static
170 int
171 hammer_vop_fsync(struct vop_fsync_args *ap)
172 {
173 hammer_inode_t ip;
174 int error;
175
176 ip = VTOI(ap->a_vp);
177 error = hammer_sync_inode(ip, ap->a_waitfor, 0);
178 return (error);
179 }
180
181 /*
182 * hammer_vop_read { vp, uio, ioflag, cred }
183 */
184 static
185 int
186 hammer_vop_read(struct vop_read_args *ap)
187 {
188 struct hammer_transaction trans;
189 hammer_inode_t ip;
190 off_t offset;
191 struct buf *bp;
192 struct uio *uio;
193 int error;
194 int n;
195 int seqcount;
196
197 if (ap->a_vp->v_type != VREG)
198 return (EINVAL);
199 ip = VTOI(ap->a_vp);
200 error = 0;
201 seqcount = ap->a_ioflag >> 16;
202
203 hammer_start_transaction(&trans, ip->hmp);
204
205 /*
206 * Access the data in HAMMER_BUFSIZE blocks via the buffer cache.
207 */
208 uio = ap->a_uio;
209 while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_rec.ino_size) {
210 offset = uio->uio_offset & HAMMER_BUFMASK;
211 #if 0
212 error = cluster_read(ap->a_vp, ip->ino_rec.ino_size,
213 uio->uio_offset - offset, HAMMER_BUFSIZE,
214 MAXBSIZE, seqcount, &bp);
215 #endif
216 error = bread(ap->a_vp, uio->uio_offset - offset,
217 HAMMER_BUFSIZE, &bp);
218 if (error) {
219 brelse(bp);
220 break;
221 }
222 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
223 n = HAMMER_BUFSIZE - offset;
224 if (n > uio->uio_resid)
225 n = uio->uio_resid;
226 if (n > ip->ino_rec.ino_size - uio->uio_offset)
227 n = (int)(ip->ino_rec.ino_size - uio->uio_offset);
228 error = uiomove((char *)bp->b_data + offset, n, uio);
229 if (error) {
230 bqrelse(bp);
231 break;
232 }
233 if ((ip->flags & HAMMER_INODE_RO) == 0 &&
234 (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) {
235 ip->ino_rec.ino_atime = trans.tid;
236 hammer_modify_inode(&trans, ip, HAMMER_INODE_ITIMES);
237 }
238 bqrelse(bp);
239 }
240 hammer_commit_transaction(&trans);
241 return (error);
242 }
243
244 /*
245 * hammer_vop_write { vp, uio, ioflag, cred }
246 */
247 static
248 int
249 hammer_vop_write(struct vop_write_args *ap)
250 {
251 struct hammer_transaction trans;
252 struct hammer_inode *ip;
253 struct uio *uio;
254 off_t offset;
255 struct buf *bp;
256 int error;
257 int n;
258 int flags;
259
260 if (ap->a_vp->v_type != VREG)
261 return (EINVAL);
262 ip = VTOI(ap->a_vp);
263 error = 0;
264
265 if (ip->flags & HAMMER_INODE_RO)
266 return (EROFS);
267
268 /*
269 * Create a transaction to cover the operations we perform.
270 */
271 hammer_start_transaction(&trans, ip->hmp);
272 uio = ap->a_uio;
273
274 /*
275 * Check append mode
276 */
277 if (ap->a_ioflag & IO_APPEND)
278 uio->uio_offset = ip->ino_rec.ino_size;
279
280 /*
281 * Check for illegal write offsets. Valid range is 0...2^63-1
282 */
283 if (uio->uio_offset < 0 || uio->uio_offset + uio->uio_resid <= 0) {
284 hammer_commit_transaction(&trans);
285 return (EFBIG);
286 }
287
288 /*
289 * Access the data in HAMMER_BUFSIZE blocks via the buffer cache.
290 */
291 while (uio->uio_resid > 0) {
292 int fixsize = 0;
293
294 offset = uio->uio_offset & HAMMER_BUFMASK;
295 n = HAMMER_BUFSIZE - offset;
296 if (n > uio->uio_resid)
297 n = uio->uio_resid;
298 if (uio->uio_offset + n > ip->ino_rec.ino_size) {
299 vnode_pager_setsize(ap->a_vp, uio->uio_offset + n);
300 fixsize = 1;
301 }
302
303 if (uio->uio_segflg == UIO_NOCOPY) {
304 /*
305 * Issuing a write with the same data backing the
306 * buffer. Instantiate the buffer to collect the
307 * backing vm pages, then read-in any missing bits.
308 *
309 * This case is used by vop_stdputpages().
310 */
311 bp = getblk(ap->a_vp, uio->uio_offset - offset,
312 HAMMER_BUFSIZE, GETBLK_BHEAVY, 0);
313 if ((bp->b_flags & B_CACHE) == 0) {
314 bqrelse(bp);
315 error = bread(ap->a_vp,
316 uio->uio_offset - offset,
317 HAMMER_BUFSIZE, &bp);
318 }
319 } else if (offset == 0 && uio->uio_resid >= HAMMER_BUFSIZE) {
320 /*
321 * entirely overwrite the buffer
322 */
323 bp = getblk(ap->a_vp, uio->uio_offset - offset,
324 HAMMER_BUFSIZE, GETBLK_BHEAVY, 0);
325 } else if (offset == 0 && uio->uio_offset >= ip->ino_rec.ino_size) {
326 /*
327 * XXX
328 */
329 bp = getblk(ap->a_vp, uio->uio_offset - offset,
330 HAMMER_BUFSIZE, GETBLK_BHEAVY, 0);
331 vfs_bio_clrbuf(bp);
332 } else {
333 /*
334 * Partial overwrite, read in any missing bits then
335 * replace the portion being written.
336 */
337 error = bread(ap->a_vp, uio->uio_offset - offset,
338 HAMMER_BUFSIZE, &bp);
339 if (error == 0)
340 bheavy(bp);
341 }
342 if (error == 0)
343 error = uiomove((char *)bp->b_data + offset, n, uio);
344
345 /*
346 * If we screwed up we have to undo any VM size changes we
347 * made.
348 */
349 if (error) {
350 brelse(bp);
351 if (fixsize) {
352 vtruncbuf(ap->a_vp, ip->ino_rec.ino_size,
353 HAMMER_BUFSIZE);
354 }
355 break;
356 }
357 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
358 if (ip->ino_rec.ino_size < uio->uio_offset) {
359 ip->ino_rec.ino_size = uio->uio_offset;
360 flags = HAMMER_INODE_RDIRTY;
361 vnode_pager_setsize(ap->a_vp, ip->ino_rec.ino_size);
362 } else {
363 flags = 0;
364 }
365 ip->ino_rec.ino_mtime = trans.tid;
366 flags |= HAMMER_INODE_ITIMES | HAMMER_INODE_BUFS;
367 hammer_modify_inode(&trans, ip, flags);
368
369 /*
370 * The file write must be tagged with the same TID as the
371 * inode, for consistency in case the inode changed size.
372 * This guarantees the on-disk data records will have a
373 * TID <= the inode TID representing the size change.
374 *
375 * If a prior write has not yet flushed, retain its TID.
376 */
377 if (bp->b_tid == 0)
378 bp->b_tid = ip->last_tid;
379
380 if (ap->a_ioflag & IO_SYNC) {
381 bwrite(bp);
382 } else if (ap->a_ioflag & IO_DIRECT) {
383 bawrite(bp);
384 } else {
385 bdwrite(bp);
386 }
387 }
388 if (error)
389 hammer_abort_transaction(&trans);
390 else
391 hammer_commit_transaction(&trans);
392 return (error);
393 }
394
395 /*
396 * hammer_vop_access { vp, mode, cred }
397 */
398 static
399 int
400 hammer_vop_access(struct vop_access_args *ap)
401 {
402 struct hammer_inode *ip = VTOI(ap->a_vp);
403 uid_t uid;
404 gid_t gid;
405 int error;
406
407 uid = hammer_to_unix_xid(&ip->ino_data.uid);
408 gid = hammer_to_unix_xid(&ip->ino_data.gid);
409
410 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
411 ip->ino_data.uflags);
412 return (error);
413 }
414
415 /*
416 * hammer_vop_advlock { vp, id, op, fl, flags }
417 */
418 static
419 int
420 hammer_vop_advlock(struct vop_advlock_args *ap)
421 {
422 struct hammer_inode *ip = VTOI(ap->a_vp);
423
424 return (lf_advlock(ap, &ip->advlock, ip->ino_rec.ino_size));
425 }
426
427 /*
428 * hammer_vop_close { vp, fflag }
429 */
430 static
431 int
432 hammer_vop_close(struct vop_close_args *ap)
433 {
434 return (vop_stdclose(ap));
435 }
436
437 /*
438 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
439 *
440 * The operating system has already ensured that the directory entry
441 * does not exist and done all appropriate namespace locking.
442 */
443 static
444 int
445 hammer_vop_ncreate(struct vop_ncreate_args *ap)
446 {
447 struct hammer_transaction trans;
448 struct hammer_inode *dip;
449 struct hammer_inode *nip;
450 struct nchandle *nch;
451 int error;
452
453 nch = ap->a_nch;
454 dip = VTOI(ap->a_dvp);
455
456 if (dip->flags & HAMMER_INODE_RO)
457 return (EROFS);
458
459 /*
460 * Create a transaction to cover the operations we perform.
461 */
462 hammer_start_transaction(&trans, dip->hmp);
463
464 /*
465 * Create a new filesystem object of the requested type. The
466 * returned inode will be referenced but not locked.
467 */
468
469 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, dip, &nip);
470 if (error)
471 kprintf("hammer_create_inode error %d\n", error);
472 if (error) {
473 hammer_abort_transaction(&trans);
474 *ap->a_vpp = NULL;
475 return (error);
476 }
477
478 /*
479 * Add the new filesystem object to the directory. This will also
480 * bump the inode's link count.
481 */
482 error = hammer_ip_add_directory(&trans, dip, nch->ncp, nip);
483 if (error)
484 kprintf("hammer_ip_add_directory error %d\n", error);
485
486 /*
487 * Finish up.
488 */
489 if (error) {
490 hammer_rel_inode(nip, 0);
491 hammer_abort_transaction(&trans);
492 *ap->a_vpp = NULL;
493 } else {
494 hammer_commit_transaction(&trans);
495 error = hammer_get_vnode(nip, LK_EXCLUSIVE, ap->a_vpp);
496 hammer_rel_inode(nip, 0);
497 if (error == 0) {
498 cache_setunresolved(ap->a_nch);
499 cache_setvp(ap->a_nch, *ap->a_vpp);
500 }
501 }
502 return (error);
503 }
504
505 /*
506 * hammer_vop_getattr { vp, vap }
507 */
508 static
509 int
510 hammer_vop_getattr(struct vop_getattr_args *ap)
511 {
512 struct hammer_inode *ip = VTOI(ap->a_vp);
513 struct vattr *vap = ap->a_vap;
514
515 #if 0
516 if (cache_check_fsmid_vp(ap->a_vp, &ip->fsmid) &&
517 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0 &&
518 ip->obj_asof == XXX
519 ) {
520 /* LAZYMOD XXX */
521 }
522 hammer_itimes(ap->a_vp);
523 #endif
524
525 vap->va_fsid = ip->hmp->fsid_udev;
526 vap->va_fileid = ip->ino_rec.base.base.obj_id;
527 vap->va_mode = ip->ino_data.mode;
528 vap->va_nlink = ip->ino_rec.ino_nlinks;
529 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
530 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
531 vap->va_rmajor = 0;
532 vap->va_rminor = 0;
533 vap->va_size = ip->ino_rec.ino_size;
534 hammer_to_timespec(ip->ino_rec.ino_atime, &vap->va_atime);
535 hammer_to_timespec(ip->ino_rec.ino_mtime, &vap->va_mtime);
536 hammer_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
537 vap->va_flags = ip->ino_data.uflags;
538 vap->va_gen = 1; /* hammer inums are unique for all time */
539 vap->va_blocksize = 32768; /* XXX - extract from root volume */
540 vap->va_bytes = ip->ino_rec.ino_size;
541 vap->va_type = hammer_get_vnode_type(ip->ino_rec.base.base.obj_type);
542 vap->va_filerev = 0; /* XXX */
543 /* mtime uniquely identifies any adjustments made to the file */
544 vap->va_fsmid = ip->ino_rec.ino_mtime;
545 vap->va_uid_uuid = ip->ino_data.uid;
546 vap->va_gid_uuid = ip->ino_data.gid;
547 vap->va_fsid_uuid = ip->hmp->fsid;
548 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
549 VA_FSID_UUID_VALID;
550
551 switch (ip->ino_rec.base.base.obj_type) {
552 case HAMMER_OBJTYPE_CDEV:
553 case HAMMER_OBJTYPE_BDEV:
554 vap->va_rmajor = ip->ino_data.rmajor;
555 vap->va_rminor = ip->ino_data.rminor;
556 break;
557 default:
558 break;
559 }
560
561 return(0);
562 }
563
564 /*
565 * hammer_vop_nresolve { nch, dvp, cred }
566 *
567 * Locate the requested directory entry.
568 */
569 static
570 int
571 hammer_vop_nresolve(struct vop_nresolve_args *ap)
572 {
573 struct namecache *ncp;
574 hammer_inode_t dip;
575 hammer_inode_t ip;
576 hammer_tid_t asof;
577 struct hammer_cursor cursor;
578 union hammer_record_ondisk *rec;
579 struct vnode *vp;
580 int64_t namekey;
581 int error;
582 int i;
583 int nlen;
584 int flags;
585 u_int64_t obj_id;
586
587 /*
588 * Misc initialization, plus handle as-of name extensions. Look for
589 * the '@@' extension. Note that as-of files and directories cannot
590 * be modified.
591 */
592 dip = VTOI(ap->a_dvp);
593 ncp = ap->a_nch->ncp;
594 asof = dip->obj_asof;
595 nlen = ncp->nc_nlen;
596 flags = dip->flags;
597
598 for (i = 0; i < nlen; ++i) {
599 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
600 asof = hammer_str_to_tid(ncp->nc_name + i + 2);
601 flags |= HAMMER_INODE_RO;
602 break;
603 }
604 }
605 nlen = i;
606
607 /*
608 * If there is no path component the time extension is relative to
609 * dip.
610 */
611 if (nlen == 0) {
612 ip = hammer_get_inode(dip->hmp, &dip->cache[1], dip->obj_id,
613 asof, flags, &error);
614 if (error == 0) {
615 error = hammer_get_vnode(ip, LK_EXCLUSIVE, &vp);
616 hammer_rel_inode(ip, 0);
617 } else {
618 vp = NULL;
619 }
620 if (error == 0) {
621 vn_unlock(vp);
622 cache_setvp(ap->a_nch, vp);
623 vrele(vp);
624 }
625 return(error);
626 }
627
628 /*
629 * Calculate the namekey and setup the key range for the scan. This
630 * works kinda like a chained hash table where the lower 32 bits
631 * of the namekey synthesize the chain.
632 *
633 * The key range is inclusive of both key_beg and key_end.
634 */
635 namekey = hammer_directory_namekey(ncp->nc_name, nlen);
636
637 error = hammer_init_cursor_hmp(&cursor, &dip->cache[0], dip->hmp);
638 cursor.key_beg.obj_id = dip->obj_id;
639 cursor.key_beg.key = namekey;
640 cursor.key_beg.create_tid = 0;
641 cursor.key_beg.delete_tid = 0;
642 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
643 cursor.key_beg.obj_type = 0;
644
645 cursor.key_end = cursor.key_beg;
646 cursor.key_end.key |= 0xFFFFFFFFULL;
647 cursor.asof = asof;
648 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
649
650 /*
651 * Scan all matching records (the chain), locate the one matching
652 * the requested path component.
653 *
654 * The hammer_ip_*() functions merge in-memory records with on-disk
655 * records for the purposes of the search.
656 */
657 if (error == 0)
658 error = hammer_ip_first(&cursor, dip);
659
660 rec = NULL;
661 obj_id = 0;
662
663 while (error == 0) {
664 error = hammer_ip_resolve_data(&cursor);
665 if (error)
666 break;
667 rec = cursor.record;
668 if (nlen == rec->entry.base.data_len &&
669 bcmp(ncp->nc_name, cursor.data1, nlen) == 0) {
670 obj_id = rec->entry.obj_id;
671 break;
672 }
673 error = hammer_ip_next(&cursor);
674 }
675 hammer_done_cursor(&cursor);
676 if (error == 0) {
677 ip = hammer_get_inode(dip->hmp, &dip->cache[1],
678 obj_id, asof, flags, &error);
679 if (error == 0) {
680 error = hammer_get_vnode(ip, LK_EXCLUSIVE, &vp);
681 hammer_rel_inode(ip, 0);
682 } else {
683 vp = NULL;
684 }
685 if (error == 0) {
686 vn_unlock(vp);
687 cache_setvp(ap->a_nch, vp);
688 vrele(vp);
689 }
690 } else if (error == ENOENT) {
691 cache_setvp(ap->a_nch, NULL);
692 }
693 return (error);
694 }
695
696 /*
697 * hammer_vop_nlookupdotdot { dvp, vpp, cred }
698 *
699 * Locate the parent directory of a directory vnode.
700 *
701 * dvp is referenced but not locked. *vpp must be returned referenced and
702 * locked. A parent_obj_id of 0 does not necessarily indicate that we are
703 * at the root, instead it could indicate that the directory we were in was
704 * removed.
705 *
706 * NOTE: as-of sequences are not linked into the directory structure. If
707 * we are at the root with a different asof then the mount point, reload
708 * the same directory with the mount point's asof. I'm not sure what this
709 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not
710 * get confused, but it hasn't been tested.
711 */
712 static
713 int
714 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
715 {
716 struct hammer_inode *dip;
717 struct hammer_inode *ip;
718 int64_t parent_obj_id;
719 hammer_tid_t asof;
720 int error;
721
722 dip = VTOI(ap->a_dvp);
723 asof = dip->obj_asof;
724 parent_obj_id = dip->ino_data.parent_obj_id;
725
726 if (parent_obj_id == 0) {
727 if (dip->obj_id == HAMMER_OBJID_ROOT &&
728 asof != dip->hmp->asof) {
729 parent_obj_id = dip->obj_id;
730 asof = dip->hmp->asof;
731 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK);
732 ksnprintf(*ap->a_fakename, 19, "0x%016llx",
733 dip->obj_asof);
734 } else {
735 *ap->a_vpp = NULL;
736 return ENOENT;
737 }
738 }
739
740 ip = hammer_get_inode(dip->hmp, &dip->cache[1], parent_obj_id,
741 asof, dip->flags, &error);
742 if (ip == NULL) {
743 *ap->a_vpp = NULL;
744 return(error);
745 }
746 error = hammer_get_vnode(ip, LK_EXCLUSIVE, ap->a_vpp);
747 hammer_rel_inode(ip, 0);
748 return (error);
749 }
750
751 /*
752 * hammer_vop_nlink { nch, dvp, vp, cred }
753 */
754 static
755 int
756 hammer_vop_nlink(struct vop_nlink_args *ap)
757 {
758 struct hammer_transaction trans;
759 struct hammer_inode *dip;
760 struct hammer_inode *ip;
761 struct nchandle *nch;
762 int error;
763
764 nch = ap->a_nch;
765 dip = VTOI(ap->a_dvp);
766 ip = VTOI(ap->a_vp);
767
768 if (dip->flags & HAMMER_INODE_RO)
769 return (EROFS);
770 if (ip->flags & HAMMER_INODE_RO)
771 return (EROFS);
772
773 /*
774 * Create a transaction to cover the operations we perform.
775 */
776 hammer_start_transaction(&trans, dip->hmp);
777
778 /*
779 * Add the filesystem object to the directory. Note that neither
780 * dip nor ip are referenced or locked, but their vnodes are
781 * referenced. This function will bump the inode's link count.
782 */
783 error = hammer_ip_add_directory(&trans, dip, nch->ncp, ip);
784
785 /*
786 * Finish up.
787 */
788 if (error) {
789 hammer_abort_transaction(&trans);
790 } else {
791 cache_setunresolved(nch);
792 cache_setvp(nch, ap->a_vp);
793 hammer_commit_transaction(&trans);
794 }
795 return (error);
796 }
797
798 /*
799 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
800 *
801 * The operating system has already ensured that the directory entry
802 * does not exist and done all appropriate namespace locking.
803 */
804 static
805 int
806 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
807 {
808 struct hammer_transaction trans;
809 struct hammer_inode *dip;
810 struct hammer_inode *nip;
811 struct nchandle *nch;
812 int error;
813
814 nch = ap->a_nch;
815 dip = VTOI(ap->a_dvp);
816
817 if (dip->flags & HAMMER_INODE_RO)
818 return (EROFS);
819
820 /*
821 * Create a transaction to cover the operations we perform.
822 */
823 hammer_start_transaction(&trans, dip->hmp);
824
825 /*
826 * Create a new filesystem object of the requested type. The
827 * returned inode will be referenced but not locked.
828 */
829 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, dip, &nip);
830 if (error)
831 kprintf("hammer_mkdir error %d\n", error);
832 if (error) {
833 hammer_abort_transaction(&trans);
834 *ap->a_vpp = NULL;
835 return (error);
836 }
837
838 /*
839 * Add the new filesystem object to the directory. This will also
840 * bump the inode's link count.
841 */
842 error = hammer_ip_add_directory(&trans, dip, nch->ncp, nip);
843 if (error)
844 kprintf("hammer_mkdir (add) error %d\n", error);
845
846 /*
847 * Finish up.
848 */
849 if (error) {
850 hammer_rel_inode(nip, 0);
851 hammer_abort_transaction(&trans);
852 *ap->a_vpp = NULL;
853 } else {
854 hammer_commit_transaction(&trans);
855 error = hammer_get_vnode(nip, LK_EXCLUSIVE, ap->a_vpp);
856 hammer_rel_inode(nip, 0);
857 if (error == 0) {
858 cache_setunresolved(ap->a_nch);
859 cache_setvp(ap->a_nch, *ap->a_vpp);
860 }
861 }
862 return (error);
863 }
864
865 /*
866 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
867 *
868 * The operating system has already ensured that the directory entry
869 * does not exist and done all appropriate namespace locking.
870 */
871 static
872 int
873 hammer_vop_nmknod(struct vop_nmknod_args *ap)
874 {
875 struct hammer_transaction trans;
876 struct hammer_inode *dip;
877 struct hammer_inode *nip;
878 struct nchandle *nch;
879 int error;
880
881 nch = ap->a_nch;
882 dip = VTOI(ap->a_dvp);
883
884 if (dip->flags & HAMMER_INODE_RO)
885 return (EROFS);
886
887 /*
888 * Create a transaction to cover the operations we perform.
889 */
890 hammer_start_transaction(&trans, dip->hmp);
891
892 /*
893 * Create a new filesystem object of the requested type. The
894 * returned inode will be referenced but not locked.
895 */
896 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, dip, &nip);
897 if (error) {
898 hammer_abort_transaction(&trans);
899 *ap->a_vpp = NULL;
900 return (error);
901 }
902
903 /*
904 * Add the new filesystem object to the directory. This will also
905 * bump the inode's link count.
906 */
907 error = hammer_ip_add_directory(&trans, dip, nch->ncp, nip);
908
909 /*
910 * Finish up.
911 */
912 if (error) {
913 hammer_rel_inode(nip, 0);
914 hammer_abort_transaction(&trans);
915 *ap->a_vpp = NULL;
916 } else {
917 hammer_commit_transaction(&trans);
918 error = hammer_get_vnode(nip, LK_EXCLUSIVE, ap->a_vpp);
919 hammer_rel_inode(nip, 0);
920 if (error == 0) {
921 cache_setunresolved(ap->a_nch);
922 cache_setvp(ap->a_nch, *ap->a_vpp);
923 }
924 }
925 return (error);
926 }
927
928 /*
929 * hammer_vop_open { vp, mode, cred, fp }
930 */
931 static
932 int
933 hammer_vop_open(struct vop_open_args *ap)
934 {
935 if ((ap->a_mode & FWRITE) && (VTOI(ap->a_vp)->flags & HAMMER_INODE_RO))
936 return (EROFS);
937
938 return(vop_stdopen(ap));
939 }
940
941 /*
942 * hammer_vop_pathconf { vp, name, retval }
943 */
944 static
945 int
946 hammer_vop_pathconf(struct vop_pathconf_args *ap)
947 {
948 return EOPNOTSUPP;
949 }
950
951 /*
952 * hammer_vop_print { vp }
953 */
954 static
955 int
956 hammer_vop_print(struct vop_print_args *ap)
957 {
958 return EOPNOTSUPP;
959 }
960
961 /*
962 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
963 */
964 static
965 int
966 hammer_vop_readdir(struct vop_readdir_args *ap)
967 {
968 struct hammer_cursor cursor;
969 struct hammer_inode *ip;
970 struct uio *uio;
971 hammer_record_ondisk_t rec;
972 hammer_base_elm_t base;
973 int error;
974 int cookie_index;
975 int ncookies;
976 off_t *cookies;
977 off_t saveoff;
978 int r;
979
980 ip = VTOI(ap->a_vp);
981 uio = ap->a_uio;
982 saveoff = uio->uio_offset;
983
984 if (ap->a_ncookies) {
985 ncookies = uio->uio_resid / 16 + 1;
986 if (ncookies > 1024)
987 ncookies = 1024;
988 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
989 cookie_index = 0;
990 } else {
991 ncookies = -1;
992 cookies = NULL;
993 cookie_index = 0;
994 }
995
996 /*
997 * Handle artificial entries
998 */
999 error = 0;
1000 if (saveoff == 0) {
1001 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
1002 if (r)
1003 goto done;
1004 if (cookies)
1005 cookies[cookie_index] = saveoff;
1006 ++saveoff;
1007 ++cookie_index;
1008 if (cookie_index == ncookies)
1009 goto done;
1010 }
1011 if (saveoff == 1) {
1012 if (ip->ino_data.parent_obj_id) {
1013 r = vop_write_dirent(&error, uio,
1014 ip->ino_data.parent_obj_id,
1015 DT_DIR, 2, "..");
1016 } else {
1017 r = vop_write_dirent(&error, uio,
1018 ip->obj_id, DT_DIR, 2, "..");
1019 }
1020 if (r)
1021 goto done;
1022 if (cookies)
1023 cookies[cookie_index] = saveoff;
1024 ++saveoff;
1025 ++cookie_index;
1026 if (cookie_index == ncookies)
1027 goto done;
1028 }
1029
1030 /*
1031 * Key range (begin and end inclusive) to scan. Directory keys
1032 * directly translate to a 64 bit 'seek' position.
1033 */
1034 hammer_init_cursor_hmp(&cursor, &ip->cache[0], ip->hmp);
1035 cursor.key_beg.obj_id = ip->obj_id;
1036 cursor.key_beg.create_tid = 0;
1037 cursor.key_beg.delete_tid = 0;
1038 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1039 cursor.key_beg.obj_type = 0;
1040 cursor.key_beg.key = saveoff;
1041
1042 cursor.key_end = cursor.key_beg;
1043 cursor.key_end.key = HAMMER_MAX_KEY;
1044 cursor.asof = ip->obj_asof;
1045 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1046
1047 error = hammer_ip_first(&cursor, ip);
1048
1049 while (error == 0) {
1050 error = hammer_ip_resolve_data(&cursor);
1051 if (error)
1052 break;
1053 rec = cursor.record;
1054 base = &rec->base.base;
1055 saveoff = base->key;
1056
1057 if (base->obj_id != ip->obj_id)
1058 panic("readdir: bad record at %p", cursor.node);
1059
1060 r = vop_write_dirent(
1061 &error, uio, rec->entry.obj_id,
1062 hammer_get_dtype(rec->entry.base.base.obj_type),
1063 rec->entry.base.data_len,
1064 (void *)cursor.data1);
1065 if (r)
1066 break;
1067 ++saveoff;
1068 if (cookies)
1069 cookies[cookie_index] = base->key;
1070 ++cookie_index;
1071 if (cookie_index == ncookies)
1072 break;
1073 error = hammer_ip_next(&cursor);
1074 }
1075 hammer_done_cursor(&cursor);
1076
1077 done:
1078 if (ap->a_eofflag)
1079 *ap->a_eofflag = (error == ENOENT);
1080 uio->uio_offset = saveoff;
1081 if (error && cookie_index == 0) {
1082 if (error == ENOENT)
1083 error = 0;
1084 if (cookies) {
1085 kfree(cookies, M_TEMP);
1086 *ap->a_ncookies = 0;
1087 *ap->a_cookies = NULL;
1088 }
1089 } else {
1090 if (error == ENOENT)
1091 error = 0;
1092 if (cookies) {
1093 *ap->a_ncookies = cookie_index;
1094 *ap->a_cookies = cookies;
1095 }
1096 }
1097 return(error);
1098 }
1099
1100 /*
1101 * hammer_vop_readlink { vp, uio, cred }
1102 */
1103 static
1104 int
1105 hammer_vop_readlink(struct vop_readlink_args *ap)
1106 {
1107 struct hammer_cursor cursor;
1108 struct hammer_inode *ip;
1109 int error;
1110
1111 ip = VTOI(ap->a_vp);
1112 hammer_init_cursor_hmp(&cursor, &ip->cache[0], ip->hmp);
1113
1114 /*
1115 * Key range (begin and end inclusive) to scan. Directory keys
1116 * directly translate to a 64 bit 'seek' position.
1117 */
1118 cursor.key_beg.obj_id = ip->obj_id;
1119 cursor.key_beg.create_tid = 0;
1120 cursor.key_beg.delete_tid = 0;
1121 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1122 cursor.key_beg.obj_type = 0;
1123 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1124 cursor.asof = ip->obj_asof;
1125 cursor.flags |= HAMMER_CURSOR_ASOF;
1126
1127 error = hammer_ip_lookup(&cursor, ip);
1128 if (error == 0) {
1129 error = hammer_ip_resolve_data(&cursor);
1130 if (error == 0) {
1131 error = uiomove((char *)cursor.data1,
1132 cursor.record->base.data_len,
1133 ap->a_uio);
1134 }
1135 }
1136 hammer_done_cursor(&cursor);
1137 return(error);
1138 }
1139
1140 /*
1141 * hammer_vop_nremove { nch, dvp, cred }
1142 */
1143 static
1144 int
1145 hammer_vop_nremove(struct vop_nremove_args *ap)
1146 {
1147 return(hammer_dounlink(ap->a_nch, ap->a_dvp, ap->a_cred, 0));
1148 }
1149
1150 /*
1151 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1152 */
1153 static
1154 int
1155 hammer_vop_nrename(struct vop_nrename_args *ap)
1156 {
1157 struct hammer_transaction trans;
1158 struct namecache *fncp;
1159 struct namecache *tncp;
1160 struct hammer_inode *fdip;
1161 struct hammer_inode *tdip;
1162 struct hammer_inode *ip;
1163 struct hammer_cursor cursor;
1164 union hammer_record_ondisk *rec;
1165 int64_t namekey;
1166 int error;
1167
1168 fdip = VTOI(ap->a_fdvp);
1169 tdip = VTOI(ap->a_tdvp);
1170 fncp = ap->a_fnch->ncp;
1171 tncp = ap->a_tnch->ncp;
1172 ip = VTOI(fncp->nc_vp);
1173 KKASSERT(ip != NULL);
1174
1175 if (fdip->flags & HAMMER_INODE_RO)
1176 return (EROFS);
1177 if (tdip->flags & HAMMER_INODE_RO)
1178 return (EROFS);
1179 if (ip->flags & HAMMER_INODE_RO)
1180 return (EROFS);
1181
1182 hammer_start_transaction(&trans, fdip->hmp);
1183
1184 /*
1185 * Remove tncp from the target directory and then link ip as
1186 * tncp. XXX pass trans to dounlink
1187 *
1188 * Force the inode sync-time to match the transaction so it is
1189 * in-sync with the creation of the target directory entry.
1190 */
1191 error = hammer_dounlink(ap->a_tnch, ap->a_tdvp, ap->a_cred, 0);
1192 if (error == 0 || error == ENOENT) {
1193 error = hammer_ip_add_directory(&trans, tdip, tncp, ip);
1194 if (error == 0) {
1195 ip->ino_data.parent_obj_id = tdip->obj_id;
1196 hammer_modify_inode(&trans, ip,
1197 HAMMER_INODE_DDIRTY | HAMMER_INODE_TIDLOCKED);
1198 }
1199 }
1200 if (error)
1201 goto failed; /* XXX */
1202
1203 /*
1204 * Locate the record in the originating directory and remove it.
1205 *
1206 * Calculate the namekey and setup the key range for the scan. This
1207 * works kinda like a chained hash table where the lower 32 bits
1208 * of the namekey synthesize the chain.
1209 *
1210 * The key range is inclusive of both key_beg and key_end.
1211 */
1212 namekey = hammer_directory_namekey(fncp->nc_name, fncp->nc_nlen);
1213 retry:
1214 hammer_init_cursor_hmp(&cursor, &fdip->cache[0], fdip->hmp);
1215 cursor.key_beg.obj_id = fdip->obj_id;
1216 cursor.key_beg.key = namekey;
1217 cursor.key_beg.create_tid = 0;
1218 cursor.key_beg.delete_tid = 0;
1219 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1220 cursor.key_beg.obj_type = 0;
1221
1222 cursor.key_end = cursor.key_beg;
1223 cursor.key_end.key |= 0xFFFFFFFFULL;
1224 cursor.asof = fdip->obj_asof;
1225 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1226
1227 /*
1228 * Scan all matching records (the chain), locate the one matching
1229 * the requested path component.
1230 *
1231 * The hammer_ip_*() functions merge in-memory records with on-disk
1232 * records for the purposes of the search.
1233 */
1234 error = hammer_ip_first(&cursor, fdip);
1235 while (error == 0) {
1236 if (hammer_ip_resolve_data(&cursor) != 0)
1237 break;
1238 rec = cursor.record;
1239 if (fncp->nc_nlen == rec->entry.base.data_len &&
1240 bcmp(fncp->nc_name, cursor.data1, fncp->nc_nlen) == 0) {
1241 break;
1242 }
1243 error = hammer_ip_next(&cursor);
1244 }
1245
1246 /*
1247 * If all is ok we have to get the inode so we can adjust nlinks.
1248 *
1249 * WARNING: hammer_ip_del_directory() may have to terminate the
1250 * cursor to avoid a recursion. It's ok to call hammer_done_cursor()
1251 * twice.
1252 */
1253 if (error == 0)
1254 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
1255 hammer_done_cursor(&cursor);
1256 if (error == 0)
1257 cache_rename(ap->a_fnch, ap->a_tnch);
1258 if (error == EDEADLK)
1259 goto retry;
1260 failed:
1261 if (error == 0) {
1262 hammer_commit_transaction(&trans);
1263 } else {
1264 hammer_abort_transaction(&trans);
1265 }
1266 return (error);
1267 }
1268
1269 /*
1270 * hammer_vop_nrmdir { nch, dvp, cred }
1271 */
1272 static
1273 int
1274 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
1275 {
1276 return(hammer_dounlink(ap->a_nch, ap->a_dvp, ap->a_cred, 0));
1277 }
1278
1279 /*
1280 * hammer_vop_setattr { vp, vap, cred }
1281 */
1282 static
1283 int
1284 hammer_vop_setattr(struct vop_setattr_args *ap)
1285 {
1286 struct hammer_transaction trans;
1287 struct vattr *vap;
1288 struct hammer_inode *ip;
1289 int modflags;
1290 int error;
1291 int truncating;
1292 int64_t aligned_size;
1293 u_int32_t flags;
1294 uuid_t uuid;
1295
1296 vap = ap->a_vap;
1297 ip = ap->a_vp->v_data;
1298 modflags = 0;
1299
1300 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1301 return(EROFS);
1302 if (ip->flags & HAMMER_INODE_RO)
1303 return (EROFS);
1304
1305 hammer_start_transaction(&trans, ip->hmp);
1306 error = 0;
1307
1308 if (vap->va_flags != VNOVAL) {
1309 flags = ip->ino_data.uflags;
1310 error = vop_helper_setattr_flags(&flags, vap->va_flags,
1311 hammer_to_unix_xid(&ip->ino_data.uid),
1312 ap->a_cred);
1313 if (error == 0) {
1314 if (ip->ino_data.uflags != flags) {
1315 ip->ino_data.uflags = flags;
1316 modflags |= HAMMER_INODE_DDIRTY;
1317 }
1318 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1319 error = 0;
1320 goto done;
1321 }
1322 }
1323 goto done;
1324 }
1325 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1326 error = EPERM;
1327 goto done;
1328 }
1329 if (vap->va_uid != (uid_t)VNOVAL) {
1330 hammer_guid_to_uuid(&uuid, vap->va_uid);
1331 if (bcmp(&uuid, &ip->ino_data.uid, sizeof(uuid)) != 0) {
1332 ip->ino_data.uid = uuid;
1333 modflags |= HAMMER_INODE_DDIRTY;
1334 }
1335 }
1336 if (vap->va_gid != (uid_t)VNOVAL) {
1337 hammer_guid_to_uuid(&uuid, vap->va_gid);
1338 if (bcmp(&uuid, &ip->ino_data.gid, sizeof(uuid)) != 0) {
1339 ip->ino_data.gid = uuid;
1340 modflags |= HAMMER_INODE_DDIRTY;
1341 }
1342 }
1343 while (vap->va_size != VNOVAL && ip->ino_rec.ino_size != vap->va_size) {
1344 switch(ap->a_vp->v_type) {
1345 case VREG:
1346 if (vap->va_size == ip->ino_rec.ino_size)
1347 break;
1348 if (vap->va_size < ip->ino_rec.ino_size) {
1349 vtruncbuf(ap->a_vp, vap->va_size,
1350 HAMMER_BUFSIZE);
1351 truncating = 1;
1352 } else {
1353 vnode_pager_setsize(ap->a_vp, vap->va_size);
1354 truncating = 0;
1355 }
1356 ip->ino_rec.ino_size = vap->va_size;
1357 modflags |= HAMMER_INODE_RDIRTY;
1358 aligned_size = (vap->va_size + HAMMER_BUFMASK) &
1359 ~(int64_t)HAMMER_BUFMASK;
1360
1361 if (truncating) {
1362 error = hammer_ip_delete_range(&trans, ip,
1363 aligned_size,
1364 0x7FFFFFFFFFFFFFFFLL);
1365 }
1366 /*
1367 * If truncating we have to clean out a portion of
1368 * the last block on-disk.
1369 */
1370 if (truncating && error == 0 &&
1371 vap->va_size < aligned_size) {
1372 struct buf *bp;
1373 int offset;
1374
1375 offset = vap->va_size & HAMMER_BUFMASK;
1376 error = bread(ap->a_vp,
1377 aligned_size - HAMMER_BUFSIZE,
1378 HAMMER_BUFSIZE, &bp);
1379 if (error == 0) {
1380 bzero(bp->b_data + offset,
1381 HAMMER_BUFSIZE - offset);
1382 bdwrite(bp);
1383 } else {
1384 brelse(bp);
1385 }
1386 }
1387 break;
1388 case VDATABASE:
1389 error = hammer_ip_delete_range(&trans, ip,
1390 vap->va_size,
1391 0x7FFFFFFFFFFFFFFFLL);
1392 ip->ino_rec.ino_size = vap->va_size;
1393 modflags |= HAMMER_INODE_RDIRTY;
1394 break;
1395 default:
1396 error = EINVAL;
1397 goto done;
1398 }
1399 break;
1400 }
1401 if (vap->va_atime.tv_sec != VNOVAL) {
1402 ip->ino_rec.ino_atime =
1403 hammer_timespec_to_transid(&vap->va_atime);
1404 modflags |= HAMMER_INODE_ITIMES;
1405 }
1406 if (vap->va_mtime.tv_sec != VNOVAL) {
1407 ip->ino_rec.ino_mtime =
1408 hammer_timespec_to_transid(&vap->va_mtime);
1409 modflags |= HAMMER_INODE_ITIMES;
1410 }
1411 if (vap->va_mode != (mode_t)VNOVAL) {
1412 if (ip->ino_data.mode != vap->va_mode) {
1413 ip->ino_data.mode = vap->va_mode;
1414 modflags |= HAMMER_INODE_DDIRTY;
1415 }
1416 }
1417 done:
1418 if (error) {
1419 hammer_abort_transaction(&trans);
1420 } else {
1421 hammer_modify_inode(&trans, ip, modflags);
1422 hammer_commit_transaction(&trans);
1423 }
1424 return (error);
1425 }
1426
1427 /*
1428 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
1429 */
1430 static
1431 int
1432 hammer_vop_nsymlink(struct vop_nsymlink_args *ap)
1433 {
1434 struct hammer_transaction trans;
1435 struct hammer_inode *dip;
1436 struct hammer_inode *nip;
1437 struct nchandle *nch;
1438 hammer_record_t record;
1439 int error;
1440 int bytes;
1441
1442 ap->a_vap->va_type = VLNK;
1443
1444 nch = ap->a_nch;
1445 dip = VTOI(ap->a_dvp);
1446
1447 if (dip->flags & HAMMER_INODE_RO)
1448 return (EROFS);
1449
1450 /*
1451 * Create a transaction to cover the operations we perform.
1452 */
1453 hammer_start_transaction(&trans, dip->hmp);
1454
1455 /*
1456 * Create a new filesystem object of the requested type. The
1457 * returned inode will be referenced but not locked.
1458 */
1459
1460 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, dip, &nip);
1461 if (error) {
1462 hammer_abort_transaction(&trans);
1463 *ap->a_vpp = NULL;
1464 return (error);
1465 }
1466
1467 /*
1468 * Add the new filesystem object to the directory. This will also
1469 * bump the inode's link count.
1470 */
1471 error = hammer_ip_add_directory(&trans, dip, nch->ncp, nip);
1472
1473 /*
1474 * Add a record representing the symlink. symlink stores the link
1475 * as pure data, not a string, and is no \0 terminated.
1476 */
1477 if (error == 0) {
1478 record = hammer_alloc_mem_record(nip, sizeof(struct hammer_base_record));
1479 bytes = strlen(ap->a_target);
1480
1481 record->rec.base.base.key = HAMMER_FIXKEY_SYMLINK;
1482 record->rec.base.base.rec_type = HAMMER_RECTYPE_FIX;
1483 record->rec.base.data_len = bytes;
1484 record->data = (void *)ap->a_target;
1485 /* will be reallocated by routine below */
1486 error = hammer_ip_add_record(&trans, record);
1487
1488 /*
1489 * Set the file size to the length of the link.
1490 */
1491 if (error == 0) {
1492 nip->ino_rec.ino_size = bytes;
1493 hammer_modify_inode(&trans, nip, HAMMER_INODE_RDIRTY);
1494 }
1495 }
1496
1497 /*
1498 * Finish up.
1499 */
1500 if (error) {
1501 hammer_rel_inode(nip, 0);
1502 hammer_abort_transaction(&trans);
1503 *ap->a_vpp = NULL;
1504 } else {
1505 hammer_commit_transaction(&trans);
1506 error = hammer_get_vnode(nip, LK_EXCLUSIVE, ap->a_vpp);
1507 hammer_rel_inode(nip, 0);
1508 if (error == 0) {
1509 cache_setunresolved(ap->a_nch);
1510 cache_setvp(ap->a_nch, *ap->a_vpp);
1511 }
1512 }
1513 return (error);
1514 }
1515
1516 /*
1517 * hammer_vop_nwhiteout { nch, dvp, cred, flags }
1518 */
1519 static
1520 int
1521 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap)
1522 {
1523 return(hammer_dounlink(ap->a_nch, ap->a_dvp, ap->a_cred, ap->a_flags));
1524 }
1525
1526 /*
1527 * hammer_vop_ioctl { vp, command, data, fflag, cred }
1528 */
1529 static
1530 int
1531 hammer_vop_ioctl(struct vop_ioctl_args *ap)
1532 {
1533 struct hammer_inode *ip = ap->a_vp->v_data;
1534
1535 return(hammer_ioctl(ip, ap->a_command, ap->a_data,
1536 ap->a_fflag, ap->a_cred));
1537 }
1538
1539 static
1540 int
1541 hammer_vop_mountctl(struct vop_mountctl_args *ap)
1542 {
1543 struct mount *mp;
1544 int error;
1545
1546 mp = ap->a_head.a_ops->head.vv_mount;
1547
1548 switch(ap->a_op) {
1549 case MOUNTCTL_SET_EXPORT:
1550 if (ap->a_ctllen != sizeof(struct export_args))
1551 error = EINVAL;
1552 error = hammer_vfs_export(mp, ap->a_op,
1553 (const struct export_args *)ap->a_ctl);
1554 break;
1555 default:
1556 error = journal_mountctl(ap);
1557 break;
1558 }
1559 return(error);
1560 }
1561
1562 /*
1563 * hammer_vop_strategy { vp, bio }
1564 *
1565 * Strategy call, used for regular file read & write only. Note that the
1566 * bp may represent a cluster.
1567 *
1568 * To simplify operation and allow better optimizations in the future,
1569 * this code does not make any assumptions with regards to buffer alignment
1570 * or size.
1571 */
1572 static
1573 int
1574 hammer_vop_strategy(struct vop_strategy_args *ap)
1575 {
1576 struct buf *bp;
1577 int error;
1578
1579 bp = ap->a_bio->bio_buf;
1580
1581 switch(bp->b_cmd) {
1582 case BUF_CMD_READ:
1583 error = hammer_vop_strategy_read(ap);
1584 break;
1585 case BUF_CMD_WRITE:
1586 error = hammer_vop_strategy_write(ap);
1587 break;
1588 default:
1589 error = EINVAL;
1590 break;
1591 }
1592 bp->b_error = error;
1593 if (error)
1594 bp->b_flags |= B_ERROR;
1595 biodone(ap->a_bio);
1596 return (error);
1597 }
1598
1599 /*
1600 * Read from a regular file. Iterate the related records and fill in the
1601 * BIO/BUF. Gaps are zero-filled.
1602 *
1603 * The support code in hammer_object.c should be used to deal with mixed
1604 * in-memory and on-disk records.
1605 *
1606 * XXX atime update
1607 */
1608 static
1609 int
1610 hammer_vop_strategy_read(struct vop_strategy_args *ap)
1611 {
1612 struct hammer_inode *ip = ap->a_vp->v_data;
1613 struct hammer_cursor cursor;
1614 hammer_record_ondisk_t rec;
1615 hammer_base_elm_t base;
1616 struct bio *bio;
1617 struct buf *bp;
1618 int64_t rec_offset;
1619 int64_t ran_end;
1620 int64_t tmp64;
1621 int error;
1622 int boff;
1623 int roff;
1624 int x;
1625 int n;
1626
1627 bio = ap->a_bio;
1628 bp = bio->bio_buf;
1629
1630 hammer_init_cursor_hmp(&cursor, &ip->cache[0], ip->hmp);
1631
1632 /*
1633 * Key range (begin and end inclusive) to scan. Note that the key's
1634 * stored in the actual records represent BASE+LEN, not BASE. The
1635 * first record containing bio_offset will have a key > bio_offset.
1636 */
1637 cursor.key_beg.obj_id = ip->obj_id;
1638 cursor.key_beg.create_tid = 0;
1639 cursor.key_beg.delete_tid = 0;
1640 cursor.key_beg.obj_type = 0;
1641 cursor.key_beg.key = bio->bio_offset + 1;
1642 cursor.asof = ip->obj_asof;
1643 cursor.flags |= HAMMER_CURSOR_ASOF | HAMMER_CURSOR_DATAEXTOK;
1644
1645 cursor.key_end = cursor.key_beg;
1646 if (ip->ino_rec.base.base.obj_type == HAMMER_OBJTYPE_DBFILE) {
1647 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
1648 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
1649 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
1650 } else {
1651 ran_end = bio->bio_offset + bp->b_bufsize;
1652 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
1653 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
1654 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
1655 if (tmp64 < ran_end)
1656 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
1657 else
1658 cursor.key_end.key = ran_end + MAXPHYS + 1;
1659 }
1660 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
1661
1662 error = hammer_ip_first(&cursor, ip);
1663 boff = 0;
1664
1665 while (error == 0) {
1666 error = hammer_ip_resolve_data(&cursor);
1667 if (error)
1668 break;
1669 rec = cursor.record;
1670 base = &rec->base.base;
1671
1672 rec_offset = base->key - rec->data.base.data_len;
1673
1674 /*
1675 * Calculate the gap, if any, and zero-fill it.
1676 */
1677 n = (int)(rec_offset - (bio->bio_offset + boff));
1678 if (n > 0) {
1679 if (n > bp->b_bufsize - boff)
1680 n = bp->b_bufsize - boff;
1681 bzero((char *)bp->b_data + boff, n);
1682 boff += n;
1683 n = 0;
1684 }
1685
1686 /*
1687 * Calculate the data offset in the record and the number
1688 * of bytes we can copy.
1689 *
1690 * Note there is a degenerate case here where boff may
1691 * already be at bp->b_bufsize.
1692 */
1693 roff = -n;
1694 n = rec->data.base.data_len - roff;
1695 KKASSERT(n > 0);
1696 if (n > bp->b_bufsize - boff)
1697 n = bp->b_bufsize - boff;
1698 if (roff + n > cursor.data_split) {
1699 if (roff < cursor.data_split) {
1700 x = cursor.data_split - roff;
1701 bcopy((char *)cursor.data1 + roff,
1702 (char *)bp->b_data + boff,
1703 x);
1704 bcopy((char *)cursor.data2,
1705 (char *)bp->b_data + boff + x,
1706 n - x);
1707 } else {
1708 bcopy((char *)cursor.data2 + roff -
1709 cursor.data_split,
1710 (char *)bp->b_data + boff,
1711 n);
1712 }
1713 } else {
1714 bcopy((char *)cursor.data1 + roff,
1715 (char *)bp->b_data + boff, n);
1716 }
1717 boff += n;
1718 if (boff == bp->b_bufsize)
1719 break;
1720 error = hammer_ip_next(&cursor);
1721 }
1722 hammer_done_cursor(&cursor);
1723
1724 /*
1725 * There may have been a gap after the last record
1726 */
1727 if (error == ENOENT)
1728 error = 0;
1729 if (error == 0 && boff != bp->b_bufsize) {
1730 KKASSERT(boff < bp->b_bufsize);
1731 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
1732 /* boff = bp->b_bufsize; */
1733 }
1734 bp->b_resid = 0;
1735 return(error);
1736 }
1737
1738 /*
1739 * Write to a regular file. Iterate the related records and mark for
1740 * deletion. If existing edge records (left and right side) overlap our
1741 * write they have to be marked deleted and new records created, usually
1742 * referencing a portion of the original data. Then add a record to
1743 * represent the buffer.
1744 *
1745 * The support code in hammer_object.c should be used to deal with mixed
1746 * in-memory and on-disk records.
1747 */
1748 static
1749 int
1750 hammer_vop_strategy_write(struct vop_strategy_args *ap)
1751 {
1752 struct hammer_transaction trans;
1753 hammer_inode_t ip;
1754 struct bio *bio;
1755 struct buf *bp;
1756 int error;
1757
1758 bio = ap->a_bio;
1759 bp = bio->bio_buf;
1760 ip = ap->a_vp->v_data;
1761
1762 if (ip->flags & HAMMER_INODE_RO)
1763 return (EROFS);
1764
1765 /*
1766 * Start a transaction using the TID stored with the bp.
1767 */
1768 KKASSERT(bp->b_tid != 0);
1769 hammer_start_transaction_tid(&trans, ip->hmp, bp->b_tid);
1770
1771 /*
1772 * Delete any records overlapping our range. This function will
1773 * (eventually) properly truncate partial overlaps.
1774 */
1775 if (ip->ino_rec.base.base.obj_type == HAMMER_OBJTYPE_DBFILE) {
1776 error = hammer_ip_delete_range(&trans, ip, bio->bio_offset,
1777 bio->bio_offset);
1778 } else {
1779 error = hammer_ip_delete_range(&trans, ip, bio->bio_offset,
1780 bio->bio_offset +
1781 bp->b_bufsize - 1);
1782 }
1783
1784 /*
1785 * Add a single record to cover the write
1786 */
1787 if (error == 0) {
1788 error = hammer_ip_sync_data(&trans, ip, bio->bio_offset,
1789 bp->b_data, bp->b_bufsize);
1790 }
1791
1792 /*
1793 * If an error occured abort the transaction
1794 */
1795 if (error) {
1796 /* XXX undo deletion */
1797 hammer_abort_transaction(&trans);
1798 bp->b_resid = bp->b_bufsize;
1799 } else {
1800 hammer_commit_transaction(&trans);
1801 bp->b_resid = 0;
1802 bp->b_tid = 0;
1803 }
1804 return(error);
1805 }
1806
1807 /*
1808 * dounlink - disconnect a directory entry
1809 *
1810 * XXX whiteout support not really in yet
1811 */
1812 static int
1813 hammer_dounlink(struct nchandle *nch, struct vnode *dvp, struct ucred *cred,
1814 int flags)
1815 {
1816 struct hammer_transaction trans;
1817 struct namecache *ncp;
1818 hammer_inode_t dip;
1819 hammer_inode_t ip;
1820 hammer_record_ondisk_t rec;
1821 struct hammer_cursor cursor;
1822 int64_t namekey;
1823 int error;
1824
1825 /*
1826 * Calculate the namekey and setup the key range for the scan. This
1827 * works kinda like a chained hash table where the lower 32 bits
1828 * of the namekey synthesize the chain.
1829 *
1830 * The key range is inclusive of both key_beg and key_end.
1831 */
1832 dip = VTOI(dvp);
1833 ncp = nch->ncp;
1834
1835 if (dip->flags & HAMMER_INODE_RO)
1836 return (EROFS);
1837
1838 hammer_start_transaction(&trans, dip->hmp);
1839
1840 namekey = hammer_directory_namekey(ncp->nc_name, ncp->nc_nlen);
1841 retry:
1842 hammer_init_cursor_hmp(&cursor, &dip->cache[0], dip->hmp);
1843 cursor.key_beg.obj_id = dip->obj_id;
1844 cursor.key_beg.key = namekey;
1845 cursor.key_beg.create_tid = 0;
1846 cursor.key_beg.delete_tid = 0;
1847 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1848 cursor.key_beg.obj_type = 0;
1849
1850 cursor.key_end = cursor.key_beg;
1851 cursor.key_end.key |= 0xFFFFFFFFULL;
1852 cursor.asof = dip->obj_asof;
1853 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1854
1855 /*
1856 * Scan all matching records (the chain), locate the one matching
1857 * the requested path component. info->last_error contains the
1858 * error code on search termination and could be 0, ENOENT, or
1859 * something else.
1860 *
1861 * The hammer_ip_*() functions merge in-memory records with on-disk
1862 * records for the purposes of the search.
1863 */
1864 error = hammer_ip_first(&cursor, dip);
1865 while (error == 0) {
1866 error = hammer_ip_resolve_data(&cursor);
1867 if (error)
1868 break;
1869 rec = cursor.record;
1870 if (ncp->nc_nlen == rec->entry.base.data_len &&
1871 bcmp(ncp->nc_name, cursor.data1, ncp->nc_nlen) == 0) {
1872 break;
1873 }
1874 error = hammer_ip_next(&cursor);
1875 }
1876
1877 /*
1878 * If all is ok we have to get the inode so we can adjust nlinks.
1879 *
1880 * If the target is a directory, it must be empty.
1881 */
1882 if (error == 0) {
1883 ip = hammer_get_inode(dip->hmp, &dip->cache[1],
1884 rec->entry.obj_id,
1885 dip->hmp->asof, 0, &error);
1886 if (error == ENOENT) {
1887 kprintf("obj_id %016llx\n", rec->entry.obj_id);
1888 Debugger("ENOENT unlinking object that should exist, cont to sync");
1889 hammer_sync_hmp(dip->hmp, MNT_NOWAIT);
1890 Debugger("ENOENT - sync done");
1891 }
1892 if (error == 0 && ip->ino_rec.base.base.obj_type ==
1893 HAMMER_OBJTYPE_DIRECTORY) {
1894 error = hammer_ip_check_directory_empty(&trans, ip);
1895 }
1896 /*
1897 * WARNING: hammer_ip_del_directory() may have to terminate
1898 * the cursor to avoid a lock recursion. It's ok to call
1899 * hammer_done_cursor() twice.
1900 */
1901 if (error == 0)
1902 error = hammer_ip_del_directory(&trans, &cursor, dip, ip);
1903 if (error == 0) {
1904 cache_setunresolved(nch);
1905 cache_setvp(nch, NULL);
1906 /* XXX locking */
1907 if (ip->vp)
1908 cache_inval_vp(ip->vp, CINV_DESTROY);
1909 }
1910 hammer_rel_inode(ip, 0);
1911 }
1912 hammer_done_cursor(&cursor);
1913 if (error == EDEADLK)
1914 goto retry;
1915
1916 if (error == 0)
1917 hammer_commit_transaction(&trans);
1918 else
1919 hammer_abort_transaction(&trans);
1920 return (error);
1921 }
1922
1923 /************************************************************************
1924 * FIFO AND SPECFS OPS *
1925 ************************************************************************
1926 *
1927 */
1928
1929 static int
1930 hammer_vop_fifoclose (struct vop_close_args *ap)
1931 {
1932 /* XXX update itimes */
1933 return (VOCALL(&fifo_vnode_vops, &ap->a_head));
1934 }
1935
1936 static int
1937 hammer_vop_fiforead (struct vop_read_args *ap)
1938 {
1939 int error;
1940
1941 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
1942 /* XXX update access time */
1943 return (error);
1944 }
1945
1946 static int
1947 hammer_vop_fifowrite (struct vop_write_args *ap)
1948 {
1949 int error;
1950
1951 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
1952 /* XXX update access time */
1953 return (error);
1954 }
1955
1956 static int
1957 hammer_vop_specclose (struct vop_close_args *ap)
1958 {
1959 /* XXX update itimes */
1960 return (VOCALL(&spec_vnode_vops, &ap->a_head));
1961 }
1962
1963 static int
1964 hammer_vop_specread (struct vop_read_args *ap)
1965 {
1966 /* XXX update access time */
1967 return (VOCALL(&spec_vnode_vops, &ap->a_head));
1968 }
1969
1970 static int
1971 hammer_vop_specwrite (struct vop_write_args *ap)
1972 {
1973 /* XXX update last change time */
1974 return (VOCALL(&spec_vnode_vops, &ap->a_head));
1975 }
1976
DragonFly BSD