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HAMMER 28A/many: Translation and write performance optimizations
[dragonfly.git] / sys / vfs / hammer / hammer_vnops.c
blobb036dd82b969d567f978030f6c5603f82ea71012
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 1.31 2008/02/10 18:58:23 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 if ((ap->a_ioflag >> 16) > 1 &&
385 (uio->uio_offset & HAMMER_BUFMASK) == 0) {
386 /*
387 * If seqcount indicates sequential operation and
388 * we just finished filling a buffer, push it out
389 * now to prevent the buffer cache from becoming
390 * too full, which would trigger non-optimal
391 * flushes.
392 */
393 bawrite(bp);
394 } else {
395 bdwrite(bp);
396 }
397 }
398 if (error)
399 hammer_abort_transaction(&trans);
400 else
401 hammer_commit_transaction(&trans);
402 return (error);
403 }
404
405 /*
406 * hammer_vop_access { vp, mode, cred }
407 */
408 static
409 int
410 hammer_vop_access(struct vop_access_args *ap)
411 {
412 struct hammer_inode *ip = VTOI(ap->a_vp);
413 uid_t uid;
414 gid_t gid;
415 int error;
416
417 uid = hammer_to_unix_xid(&ip->ino_data.uid);
418 gid = hammer_to_unix_xid(&ip->ino_data.gid);
419
420 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
421 ip->ino_data.uflags);
422 return (error);
423 }
424
425 /*
426 * hammer_vop_advlock { vp, id, op, fl, flags }
427 */
428 static
429 int
430 hammer_vop_advlock(struct vop_advlock_args *ap)
431 {
432 struct hammer_inode *ip = VTOI(ap->a_vp);
433
434 return (lf_advlock(ap, &ip->advlock, ip->ino_rec.ino_size));
435 }
436
437 /*
438 * hammer_vop_close { vp, fflag }
439 */
440 static
441 int
442 hammer_vop_close(struct vop_close_args *ap)
443 {
444 return (vop_stdclose(ap));
445 }
446
447 /*
448 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
449 *
450 * The operating system has already ensured that the directory entry
451 * does not exist and done all appropriate namespace locking.
452 */
453 static
454 int
455 hammer_vop_ncreate(struct vop_ncreate_args *ap)
456 {
457 struct hammer_transaction trans;
458 struct hammer_inode *dip;
459 struct hammer_inode *nip;
460 struct nchandle *nch;
461 int error;
462
463 nch = ap->a_nch;
464 dip = VTOI(ap->a_dvp);
465
466 if (dip->flags & HAMMER_INODE_RO)
467 return (EROFS);
468
469 /*
470 * Create a transaction to cover the operations we perform.
471 */
472 hammer_start_transaction(&trans, dip->hmp);
473
474 /*
475 * Create a new filesystem object of the requested type. The
476 * returned inode will be referenced but not locked.
477 */
478
479 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, dip, &nip);
480 if (error)
481 kprintf("hammer_create_inode error %d\n", error);
482 if (error) {
483 hammer_abort_transaction(&trans);
484 *ap->a_vpp = NULL;
485 return (error);
486 }
487
488 /*
489 * Add the new filesystem object to the directory. This will also
490 * bump the inode's link count.
491 */
492 error = hammer_ip_add_directory(&trans, dip, nch->ncp, nip);
493 if (error)
494 kprintf("hammer_ip_add_directory error %d\n", error);
495
496 /*
497 * Finish up.
498 */
499 if (error) {
500 hammer_rel_inode(nip, 0);
501 hammer_abort_transaction(&trans);
502 *ap->a_vpp = NULL;
503 } else {
504 hammer_commit_transaction(&trans);
505 error = hammer_get_vnode(nip, LK_EXCLUSIVE, ap->a_vpp);
506 hammer_rel_inode(nip, 0);
507 if (error == 0) {
508 cache_setunresolved(ap->a_nch);
509 cache_setvp(ap->a_nch, *ap->a_vpp);
510 }
511 }
512 return (error);
513 }
514
515 /*
516 * hammer_vop_getattr { vp, vap }
517 */
518 static
519 int
520 hammer_vop_getattr(struct vop_getattr_args *ap)
521 {
522 struct hammer_inode *ip = VTOI(ap->a_vp);
523 struct vattr *vap = ap->a_vap;
524
525 #if 0
526 if (cache_check_fsmid_vp(ap->a_vp, &ip->fsmid) &&
527 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0 &&
528 ip->obj_asof == XXX
529 ) {
530 /* LAZYMOD XXX */
531 }
532 hammer_itimes(ap->a_vp);
533 #endif
534
535 vap->va_fsid = ip->hmp->fsid_udev;
536 vap->va_fileid = ip->ino_rec.base.base.obj_id;
537 vap->va_mode = ip->ino_data.mode;
538 vap->va_nlink = ip->ino_rec.ino_nlinks;
539 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
540 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
541 vap->va_rmajor = 0;
542 vap->va_rminor = 0;
543 vap->va_size = ip->ino_rec.ino_size;
544 hammer_to_timespec(ip->ino_rec.ino_atime, &vap->va_atime);
545 hammer_to_timespec(ip->ino_rec.ino_mtime, &vap->va_mtime);
546 hammer_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
547 vap->va_flags = ip->ino_data.uflags;
548 vap->va_gen = 1; /* hammer inums are unique for all time */
549 vap->va_blocksize = 32768; /* XXX - extract from root volume */
550 vap->va_bytes = ip->ino_rec.ino_size;
551 vap->va_type = hammer_get_vnode_type(ip->ino_rec.base.base.obj_type);
552 vap->va_filerev = 0; /* XXX */
553 /* mtime uniquely identifies any adjustments made to the file */
554 vap->va_fsmid = ip->ino_rec.ino_mtime;
555 vap->va_uid_uuid = ip->ino_data.uid;
556 vap->va_gid_uuid = ip->ino_data.gid;
557 vap->va_fsid_uuid = ip->hmp->fsid;
558 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
559 VA_FSID_UUID_VALID;
560
561 switch (ip->ino_rec.base.base.obj_type) {
562 case HAMMER_OBJTYPE_CDEV:
563 case HAMMER_OBJTYPE_BDEV:
564 vap->va_rmajor = ip->ino_data.rmajor;
565 vap->va_rminor = ip->ino_data.rminor;
566 break;
567 default:
568 break;
569 }
570
571 return(0);
572 }
573
574 /*
575 * hammer_vop_nresolve { nch, dvp, cred }
576 *
577 * Locate the requested directory entry.
578 */
579 static
580 int
581 hammer_vop_nresolve(struct vop_nresolve_args *ap)
582 {
583 struct namecache *ncp;
584 hammer_inode_t dip;
585 hammer_inode_t ip;
586 hammer_tid_t asof;
587 struct hammer_cursor cursor;
588 union hammer_record_ondisk *rec;
589 struct vnode *vp;
590 int64_t namekey;
591 int error;
592 int i;
593 int nlen;
594 int flags;
595 u_int64_t obj_id;
596
597 /*
598 * Misc initialization, plus handle as-of name extensions. Look for
599 * the '@@' extension. Note that as-of files and directories cannot
600 * be modified.
601 */
602 dip = VTOI(ap->a_dvp);
603 ncp = ap->a_nch->ncp;
604 asof = dip->obj_asof;
605 nlen = ncp->nc_nlen;
606 flags = dip->flags;
607
608 for (i = 0; i < nlen; ++i) {
609 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
610 asof = hammer_str_to_tid(ncp->nc_name + i + 2);
611 flags |= HAMMER_INODE_RO;
612 break;
613 }
614 }
615 nlen = i;
616
617 /*
618 * If there is no path component the time extension is relative to
619 * dip.
620 */
621 if (nlen == 0) {
622 ip = hammer_get_inode(dip->hmp, &dip->cache[1], dip->obj_id,
623 asof, flags, &error);
624 if (error == 0) {
625 error = hammer_get_vnode(ip, LK_EXCLUSIVE, &vp);
626 hammer_rel_inode(ip, 0);
627 } else {
628 vp = NULL;
629 }
630 if (error == 0) {
631 vn_unlock(vp);
632 cache_setvp(ap->a_nch, vp);
633 vrele(vp);
634 }
635 return(error);
636 }
637
638 /*
639 * Calculate the namekey and setup the key range for the scan. This
640 * works kinda like a chained hash table where the lower 32 bits
641 * of the namekey synthesize the chain.
642 *
643 * The key range is inclusive of both key_beg and key_end.
644 */
645 namekey = hammer_directory_namekey(ncp->nc_name, nlen);
646
647 error = hammer_init_cursor_hmp(&cursor, &dip->cache[0], dip->hmp);
648 cursor.key_beg.obj_id = dip->obj_id;
649 cursor.key_beg.key = namekey;
650 cursor.key_beg.create_tid = 0;
651 cursor.key_beg.delete_tid = 0;
652 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
653 cursor.key_beg.obj_type = 0;
654
655 cursor.key_end = cursor.key_beg;
656 cursor.key_end.key |= 0xFFFFFFFFULL;
657 cursor.asof = asof;
658 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
659
660 /*
661 * Scan all matching records (the chain), locate the one matching
662 * the requested path component.
663 *
664 * The hammer_ip_*() functions merge in-memory records with on-disk
665 * records for the purposes of the search.
666 */
667 if (error == 0)
668 error = hammer_ip_first(&cursor, dip);
669
670 rec = NULL;
671 obj_id = 0;
672
673 while (error == 0) {
674 error = hammer_ip_resolve_data(&cursor);
675 if (error)
676 break;
677 rec = cursor.record;
678 if (nlen == rec->entry.base.data_len &&
679 bcmp(ncp->nc_name, cursor.data, nlen) == 0) {
680 obj_id = rec->entry.obj_id;
681 break;
682 }
683 error = hammer_ip_next(&cursor);
684 }
685 hammer_done_cursor(&cursor);
686 if (error == 0) {
687 ip = hammer_get_inode(dip->hmp, &dip->cache[1],
688 obj_id, asof, flags, &error);
689 if (error == 0) {
690 error = hammer_get_vnode(ip, LK_EXCLUSIVE, &vp);
691 hammer_rel_inode(ip, 0);
692 } else {
693 vp = NULL;
694 }
695 if (error == 0) {
696 vn_unlock(vp);
697 cache_setvp(ap->a_nch, vp);
698 vrele(vp);
699 }
700 } else if (error == ENOENT) {
701 cache_setvp(ap->a_nch, NULL);
702 }
703 return (error);
704 }
705
706 /*
707 * hammer_vop_nlookupdotdot { dvp, vpp, cred }
708 *
709 * Locate the parent directory of a directory vnode.
710 *
711 * dvp is referenced but not locked. *vpp must be returned referenced and
712 * locked. A parent_obj_id of 0 does not necessarily indicate that we are
713 * at the root, instead it could indicate that the directory we were in was
714 * removed.
715 *
716 * NOTE: as-of sequences are not linked into the directory structure. If
717 * we are at the root with a different asof then the mount point, reload
718 * the same directory with the mount point's asof. I'm not sure what this
719 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not
720 * get confused, but it hasn't been tested.
721 */
722 static
723 int
724 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
725 {
726 struct hammer_inode *dip;
727 struct hammer_inode *ip;
728 int64_t parent_obj_id;
729 hammer_tid_t asof;
730 int error;
731
732 dip = VTOI(ap->a_dvp);
733 asof = dip->obj_asof;
734 parent_obj_id = dip->ino_data.parent_obj_id;
735
736 if (parent_obj_id == 0) {
737 if (dip->obj_id == HAMMER_OBJID_ROOT &&
738 asof != dip->hmp->asof) {
739 parent_obj_id = dip->obj_id;
740 asof = dip->hmp->asof;
741 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK);
742 ksnprintf(*ap->a_fakename, 19, "0x%016llx",
743 dip->obj_asof);
744 } else {
745 *ap->a_vpp = NULL;
746 return ENOENT;
747 }
748 }
749
750 ip = hammer_get_inode(dip->hmp, &dip->cache[1], parent_obj_id,
751 asof, dip->flags, &error);
752 if (ip == NULL) {
753 *ap->a_vpp = NULL;
754 return(error);
755 }
756 error = hammer_get_vnode(ip, LK_EXCLUSIVE, ap->a_vpp);
757 hammer_rel_inode(ip, 0);
758 return (error);
759 }
760
761 /*
762 * hammer_vop_nlink { nch, dvp, vp, cred }
763 */
764 static
765 int
766 hammer_vop_nlink(struct vop_nlink_args *ap)
767 {
768 struct hammer_transaction trans;
769 struct hammer_inode *dip;
770 struct hammer_inode *ip;
771 struct nchandle *nch;
772 int error;
773
774 nch = ap->a_nch;
775 dip = VTOI(ap->a_dvp);
776 ip = VTOI(ap->a_vp);
777
778 if (dip->flags & HAMMER_INODE_RO)
779 return (EROFS);
780 if (ip->flags & HAMMER_INODE_RO)
781 return (EROFS);
782
783 /*
784 * Create a transaction to cover the operations we perform.
785 */
786 hammer_start_transaction(&trans, dip->hmp);
787
788 /*
789 * Add the filesystem object to the directory. Note that neither
790 * dip nor ip are referenced or locked, but their vnodes are
791 * referenced. This function will bump the inode's link count.
792 */
793 error = hammer_ip_add_directory(&trans, dip, nch->ncp, ip);
794
795 /*
796 * Finish up.
797 */
798 if (error) {
799 hammer_abort_transaction(&trans);
800 } else {
801 cache_setunresolved(nch);
802 cache_setvp(nch, ap->a_vp);
803 hammer_commit_transaction(&trans);
804 }
805 return (error);
806 }
807
808 /*
809 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
810 *
811 * The operating system has already ensured that the directory entry
812 * does not exist and done all appropriate namespace locking.
813 */
814 static
815 int
816 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
817 {
818 struct hammer_transaction trans;
819 struct hammer_inode *dip;
820 struct hammer_inode *nip;
821 struct nchandle *nch;
822 int error;
823
824 nch = ap->a_nch;
825 dip = VTOI(ap->a_dvp);
826
827 if (dip->flags & HAMMER_INODE_RO)
828 return (EROFS);
829
830 /*
831 * Create a transaction to cover the operations we perform.
832 */
833 hammer_start_transaction(&trans, dip->hmp);
834
835 /*
836 * Create a new filesystem object of the requested type. The
837 * returned inode will be referenced but not locked.
838 */
839 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, dip, &nip);
840 if (error)
841 kprintf("hammer_mkdir error %d\n", error);
842 if (error) {
843 hammer_abort_transaction(&trans);
844 *ap->a_vpp = NULL;
845 return (error);
846 }
847
848 /*
849 * Add the new filesystem object to the directory. This will also
850 * bump the inode's link count.
851 */
852 error = hammer_ip_add_directory(&trans, dip, nch->ncp, nip);
853 if (error)
854 kprintf("hammer_mkdir (add) error %d\n", error);
855
856 /*
857 * Finish up.
858 */
859 if (error) {
860 hammer_rel_inode(nip, 0);
861 hammer_abort_transaction(&trans);
862 *ap->a_vpp = NULL;
863 } else {
864 hammer_commit_transaction(&trans);
865 error = hammer_get_vnode(nip, LK_EXCLUSIVE, ap->a_vpp);
866 hammer_rel_inode(nip, 0);
867 if (error == 0) {
868 cache_setunresolved(ap->a_nch);
869 cache_setvp(ap->a_nch, *ap->a_vpp);
870 }
871 }
872 return (error);
873 }
874
875 /*
876 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
877 *
878 * The operating system has already ensured that the directory entry
879 * does not exist and done all appropriate namespace locking.
880 */
881 static
882 int
883 hammer_vop_nmknod(struct vop_nmknod_args *ap)
884 {
885 struct hammer_transaction trans;
886 struct hammer_inode *dip;
887 struct hammer_inode *nip;
888 struct nchandle *nch;
889 int error;
890
891 nch = ap->a_nch;
892 dip = VTOI(ap->a_dvp);
893
894 if (dip->flags & HAMMER_INODE_RO)
895 return (EROFS);
896
897 /*
898 * Create a transaction to cover the operations we perform.
899 */
900 hammer_start_transaction(&trans, dip->hmp);
901
902 /*
903 * Create a new filesystem object of the requested type. The
904 * returned inode will be referenced but not locked.
905 */
906 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, dip, &nip);
907 if (error) {
908 hammer_abort_transaction(&trans);
909 *ap->a_vpp = NULL;
910 return (error);
911 }
912
913 /*
914 * Add the new filesystem object to the directory. This will also
915 * bump the inode's link count.
916 */
917 error = hammer_ip_add_directory(&trans, dip, nch->ncp, nip);
918
919 /*
920 * Finish up.
921 */
922 if (error) {
923 hammer_rel_inode(nip, 0);
924 hammer_abort_transaction(&trans);
925 *ap->a_vpp = NULL;
926 } else {
927 hammer_commit_transaction(&trans);
928 error = hammer_get_vnode(nip, LK_EXCLUSIVE, ap->a_vpp);
929 hammer_rel_inode(nip, 0);
930 if (error == 0) {
931 cache_setunresolved(ap->a_nch);
932 cache_setvp(ap->a_nch, *ap->a_vpp);
933 }
934 }
935 return (error);
936 }
937
938 /*
939 * hammer_vop_open { vp, mode, cred, fp }
940 */
941 static
942 int
943 hammer_vop_open(struct vop_open_args *ap)
944 {
945 if ((ap->a_mode & FWRITE) && (VTOI(ap->a_vp)->flags & HAMMER_INODE_RO))
946 return (EROFS);
947
948 return(vop_stdopen(ap));
949 }
950
951 /*
952 * hammer_vop_pathconf { vp, name, retval }
953 */
954 static
955 int
956 hammer_vop_pathconf(struct vop_pathconf_args *ap)
957 {
958 return EOPNOTSUPP;
959 }
960
961 /*
962 * hammer_vop_print { vp }
963 */
964 static
965 int
966 hammer_vop_print(struct vop_print_args *ap)
967 {
968 return EOPNOTSUPP;
969 }
970
971 /*
972 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
973 */
974 static
975 int
976 hammer_vop_readdir(struct vop_readdir_args *ap)
977 {
978 struct hammer_cursor cursor;
979 struct hammer_inode *ip;
980 struct uio *uio;
981 hammer_record_ondisk_t rec;
982 hammer_base_elm_t base;
983 int error;
984 int cookie_index;
985 int ncookies;
986 off_t *cookies;
987 off_t saveoff;
988 int r;
989
990 ip = VTOI(ap->a_vp);
991 uio = ap->a_uio;
992 saveoff = uio->uio_offset;
993
994 if (ap->a_ncookies) {
995 ncookies = uio->uio_resid / 16 + 1;
996 if (ncookies > 1024)
997 ncookies = 1024;
998 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
999 cookie_index = 0;
1000 } else {
1001 ncookies = -1;
1002 cookies = NULL;
1003 cookie_index = 0;
1004 }
1005
1006 /*
1007 * Handle artificial entries
1008 */
1009 error = 0;
1010 if (saveoff == 0) {
1011 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
1012 if (r)
1013 goto done;
1014 if (cookies)
1015 cookies[cookie_index] = saveoff;
1016 ++saveoff;
1017 ++cookie_index;
1018 if (cookie_index == ncookies)
1019 goto done;
1020 }
1021 if (saveoff == 1) {
1022 if (ip->ino_data.parent_obj_id) {
1023 r = vop_write_dirent(&error, uio,
1024 ip->ino_data.parent_obj_id,
1025 DT_DIR, 2, "..");
1026 } else {
1027 r = vop_write_dirent(&error, uio,
1028 ip->obj_id, DT_DIR, 2, "..");
1029 }
1030 if (r)
1031 goto done;
1032 if (cookies)
1033 cookies[cookie_index] = saveoff;
1034 ++saveoff;
1035 ++cookie_index;
1036 if (cookie_index == ncookies)
1037 goto done;
1038 }
1039
1040 /*
1041 * Key range (begin and end inclusive) to scan. Directory keys
1042 * directly translate to a 64 bit 'seek' position.
1043 */
1044 hammer_init_cursor_hmp(&cursor, &ip->cache[0], ip->hmp);
1045 cursor.key_beg.obj_id = ip->obj_id;
1046 cursor.key_beg.create_tid = 0;
1047 cursor.key_beg.delete_tid = 0;
1048 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1049 cursor.key_beg.obj_type = 0;
1050 cursor.key_beg.key = saveoff;
1051
1052 cursor.key_end = cursor.key_beg;
1053 cursor.key_end.key = HAMMER_MAX_KEY;
1054 cursor.asof = ip->obj_asof;
1055 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1056
1057 error = hammer_ip_first(&cursor, ip);
1058
1059 while (error == 0) {
1060 error = hammer_ip_resolve_record_and_data(&cursor);
1061 if (error)
1062 break;
1063 rec = cursor.record;
1064 base = &rec->base.base;
1065 saveoff = base->key;
1066
1067 if (base->obj_id != ip->obj_id)
1068 panic("readdir: bad record at %p", cursor.node);
1069
1070 r = vop_write_dirent(
1071 &error, uio, rec->entry.obj_id,
1072 hammer_get_dtype(rec->entry.base.base.obj_type),
1073 rec->entry.base.data_len,
1074 (void *)cursor.data);
1075 if (r)
1076 break;
1077 ++saveoff;
1078 if (cookies)
1079 cookies[cookie_index] = base->key;
1080 ++cookie_index;
1081 if (cookie_index == ncookies)
1082 break;
1083 error = hammer_ip_next(&cursor);
1084 }
1085 hammer_done_cursor(&cursor);
1086
1087 done:
1088 if (ap->a_eofflag)
1089 *ap->a_eofflag = (error == ENOENT);
1090 uio->uio_offset = saveoff;
1091 if (error && cookie_index == 0) {
1092 if (error == ENOENT)
1093 error = 0;
1094 if (cookies) {
1095 kfree(cookies, M_TEMP);
1096 *ap->a_ncookies = 0;
1097 *ap->a_cookies = NULL;
1098 }
1099 } else {
1100 if (error == ENOENT)
1101 error = 0;
1102 if (cookies) {
1103 *ap->a_ncookies = cookie_index;
1104 *ap->a_cookies = cookies;
1105 }
1106 }
1107 return(error);
1108 }
1109
1110 /*
1111 * hammer_vop_readlink { vp, uio, cred }
1112 */
1113 static
1114 int
1115 hammer_vop_readlink(struct vop_readlink_args *ap)
1116 {
1117 struct hammer_cursor cursor;
1118 struct hammer_inode *ip;
1119 int error;
1120
1121 ip = VTOI(ap->a_vp);
1122 hammer_init_cursor_hmp(&cursor, &ip->cache[0], ip->hmp);
1123
1124 /*
1125 * Key range (begin and end inclusive) to scan. Directory keys
1126 * directly translate to a 64 bit 'seek' position.
1127 */
1128 cursor.key_beg.obj_id = ip->obj_id;
1129 cursor.key_beg.create_tid = 0;
1130 cursor.key_beg.delete_tid = 0;
1131 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1132 cursor.key_beg.obj_type = 0;
1133 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1134 cursor.asof = ip->obj_asof;
1135 cursor.flags |= HAMMER_CURSOR_ASOF;
1136
1137 error = hammer_ip_lookup(&cursor, ip);
1138 if (error == 0) {
1139 error = hammer_ip_resolve_data(&cursor);
1140 if (error == 0) {
1141 error = uiomove((char *)cursor.data,
1142 cursor.record->base.data_len,
1143 ap->a_uio);
1144 }
1145 }
1146 hammer_done_cursor(&cursor);
1147 return(error);
1148 }
1149
1150 /*
1151 * hammer_vop_nremove { nch, dvp, cred }
1152 */
1153 static
1154 int
1155 hammer_vop_nremove(struct vop_nremove_args *ap)
1156 {
1157 return(hammer_dounlink(ap->a_nch, ap->a_dvp, ap->a_cred, 0));
1158 }
1159
1160 /*
1161 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1162 */
1163 static
1164 int
1165 hammer_vop_nrename(struct vop_nrename_args *ap)
1166 {
1167 struct hammer_transaction trans;
1168 struct namecache *fncp;
1169 struct namecache *tncp;
1170 struct hammer_inode *fdip;
1171 struct hammer_inode *tdip;
1172 struct hammer_inode *ip;
1173 struct hammer_cursor cursor;
1174 union hammer_record_ondisk *rec;
1175 int64_t namekey;
1176 int error;
1177
1178 fdip = VTOI(ap->a_fdvp);
1179 tdip = VTOI(ap->a_tdvp);
1180 fncp = ap->a_fnch->ncp;
1181 tncp = ap->a_tnch->ncp;
1182 ip = VTOI(fncp->nc_vp);
1183 KKASSERT(ip != NULL);
1184
1185 if (fdip->flags & HAMMER_INODE_RO)
1186 return (EROFS);
1187 if (tdip->flags & HAMMER_INODE_RO)
1188 return (EROFS);
1189 if (ip->flags & HAMMER_INODE_RO)
1190 return (EROFS);
1191
1192 hammer_start_transaction(&trans, fdip->hmp);
1193
1194 /*
1195 * Remove tncp from the target directory and then link ip as
1196 * tncp. XXX pass trans to dounlink
1197 *
1198 * Force the inode sync-time to match the transaction so it is
1199 * in-sync with the creation of the target directory entry.
1200 */
1201 error = hammer_dounlink(ap->a_tnch, ap->a_tdvp, ap->a_cred, 0);
1202 if (error == 0 || error == ENOENT) {
1203 error = hammer_ip_add_directory(&trans, tdip, tncp, ip);
1204 if (error == 0) {
1205 ip->ino_data.parent_obj_id = tdip->obj_id;
1206 hammer_modify_inode(&trans, ip,
1207 HAMMER_INODE_DDIRTY | HAMMER_INODE_TIDLOCKED);
1208 }
1209 }
1210 if (error)
1211 goto failed; /* XXX */
1212
1213 /*
1214 * Locate the record in the originating directory and remove it.
1215 *
1216 * Calculate the namekey and setup the key range for the scan. This
1217 * works kinda like a chained hash table where the lower 32 bits
1218 * of the namekey synthesize the chain.
1219 *
1220 * The key range is inclusive of both key_beg and key_end.
1221 */
1222 namekey = hammer_directory_namekey(fncp->nc_name, fncp->nc_nlen);
1223 retry:
1224 hammer_init_cursor_hmp(&cursor, &fdip->cache[0], fdip->hmp);
1225 cursor.key_beg.obj_id = fdip->obj_id;
1226 cursor.key_beg.key = namekey;
1227 cursor.key_beg.create_tid = 0;
1228 cursor.key_beg.delete_tid = 0;
1229 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1230 cursor.key_beg.obj_type = 0;
1231
1232 cursor.key_end = cursor.key_beg;
1233 cursor.key_end.key |= 0xFFFFFFFFULL;
1234 cursor.asof = fdip->obj_asof;
1235 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1236
1237 /*
1238 * Scan all matching records (the chain), locate the one matching
1239 * the requested path component.
1240 *
1241 * The hammer_ip_*() functions merge in-memory records with on-disk
1242 * records for the purposes of the search.
1243 */
1244 error = hammer_ip_first(&cursor, fdip);
1245 while (error == 0) {
1246 if (hammer_ip_resolve_data(&cursor) != 0)
1247 break;
1248 rec = cursor.record;
1249 if (fncp->nc_nlen == rec->entry.base.data_len &&
1250 bcmp(fncp->nc_name, cursor.data, fncp->nc_nlen) == 0) {
1251 break;
1252 }
1253 error = hammer_ip_next(&cursor);
1254 }
1255
1256 /*
1257 * If all is ok we have to get the inode so we can adjust nlinks.
1258 *
1259 * WARNING: hammer_ip_del_directory() may have to terminate the
1260 * cursor to avoid a recursion. It's ok to call hammer_done_cursor()
1261 * twice.
1262 */
1263 if (error == 0)
1264 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
1265 hammer_done_cursor(&cursor);
1266 if (error == 0)
1267 cache_rename(ap->a_fnch, ap->a_tnch);
1268 if (error == EDEADLK)
1269 goto retry;
1270 failed:
1271 if (error == 0) {
1272 hammer_commit_transaction(&trans);
1273 } else {
1274 hammer_abort_transaction(&trans);
1275 }
1276 return (error);
1277 }
1278
1279 /*
1280 * hammer_vop_nrmdir { nch, dvp, cred }
1281 */
1282 static
1283 int
1284 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
1285 {
1286 return(hammer_dounlink(ap->a_nch, ap->a_dvp, ap->a_cred, 0));
1287 }
1288
1289 /*
1290 * hammer_vop_setattr { vp, vap, cred }
1291 */
1292 static
1293 int
1294 hammer_vop_setattr(struct vop_setattr_args *ap)
1295 {
1296 struct hammer_transaction trans;
1297 struct vattr *vap;
1298 struct hammer_inode *ip;
1299 int modflags;
1300 int error;
1301 int truncating;
1302 int64_t aligned_size;
1303 u_int32_t flags;
1304 uuid_t uuid;
1305
1306 vap = ap->a_vap;
1307 ip = ap->a_vp->v_data;
1308 modflags = 0;
1309
1310 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1311 return(EROFS);
1312 if (ip->flags & HAMMER_INODE_RO)
1313 return (EROFS);
1314
1315 hammer_start_transaction(&trans, ip->hmp);
1316 error = 0;
1317
1318 if (vap->va_flags != VNOVAL) {
1319 flags = ip->ino_data.uflags;
1320 error = vop_helper_setattr_flags(&flags, vap->va_flags,
1321 hammer_to_unix_xid(&ip->ino_data.uid),
1322 ap->a_cred);
1323 if (error == 0) {
1324 if (ip->ino_data.uflags != flags) {
1325 ip->ino_data.uflags = flags;
1326 modflags |= HAMMER_INODE_DDIRTY;
1327 }
1328 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1329 error = 0;
1330 goto done;
1331 }
1332 }
1333 goto done;
1334 }
1335 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1336 error = EPERM;
1337 goto done;
1338 }
1339 if (vap->va_uid != (uid_t)VNOVAL) {
1340 hammer_guid_to_uuid(&uuid, vap->va_uid);
1341 if (bcmp(&uuid, &ip->ino_data.uid, sizeof(uuid)) != 0) {
1342 ip->ino_data.uid = uuid;
1343 modflags |= HAMMER_INODE_DDIRTY;
1344 }
1345 }
1346 if (vap->va_gid != (uid_t)VNOVAL) {
1347 hammer_guid_to_uuid(&uuid, vap->va_gid);
1348 if (bcmp(&uuid, &ip->ino_data.gid, sizeof(uuid)) != 0) {
1349 ip->ino_data.gid = uuid;
1350 modflags |= HAMMER_INODE_DDIRTY;
1351 }
1352 }
1353 while (vap->va_size != VNOVAL && ip->ino_rec.ino_size != vap->va_size) {
1354 switch(ap->a_vp->v_type) {
1355 case VREG:
1356 if (vap->va_size == ip->ino_rec.ino_size)
1357 break;
1358 if (vap->va_size < ip->ino_rec.ino_size) {
1359 vtruncbuf(ap->a_vp, vap->va_size,
1360 HAMMER_BUFSIZE);
1361 truncating = 1;
1362 } else {
1363 vnode_pager_setsize(ap->a_vp, vap->va_size);
1364 truncating = 0;
1365 }
1366 ip->ino_rec.ino_size = vap->va_size;
1367 modflags |= HAMMER_INODE_RDIRTY;
1368 aligned_size = (vap->va_size + HAMMER_BUFMASK) &
1369 ~(int64_t)HAMMER_BUFMASK;
1370
1371 if (truncating) {
1372 error = hammer_ip_delete_range(&trans, ip,
1373 aligned_size,
1374 0x7FFFFFFFFFFFFFFFLL);
1375 }
1376 /*
1377 * If truncating we have to clean out a portion of
1378 * the last block on-disk.
1379 */
1380 if (truncating && error == 0 &&
1381 vap->va_size < aligned_size) {
1382 struct buf *bp;
1383 int offset;
1384
1385 offset = vap->va_size & HAMMER_BUFMASK;
1386 error = bread(ap->a_vp,
1387 aligned_size - HAMMER_BUFSIZE,
1388 HAMMER_BUFSIZE, &bp);
1389 if (error == 0) {
1390 bzero(bp->b_data + offset,
1391 HAMMER_BUFSIZE - offset);
1392 bdwrite(bp);
1393 } else {
1394 brelse(bp);
1395 }
1396 }
1397 break;
1398 case VDATABASE:
1399 error = hammer_ip_delete_range(&trans, ip,
1400 vap->va_size,
1401 0x7FFFFFFFFFFFFFFFLL);
1402 ip->ino_rec.ino_size = vap->va_size;
1403 modflags |= HAMMER_INODE_RDIRTY;
1404 break;
1405 default:
1406 error = EINVAL;
1407 goto done;
1408 }
1409 break;
1410 }
1411 if (vap->va_atime.tv_sec != VNOVAL) {
1412 ip->ino_rec.ino_atime =
1413 hammer_timespec_to_transid(&vap->va_atime);
1414 modflags |= HAMMER_INODE_ITIMES;
1415 }
1416 if (vap->va_mtime.tv_sec != VNOVAL) {
1417 ip->ino_rec.ino_mtime =
1418 hammer_timespec_to_transid(&vap->va_mtime);
1419 modflags |= HAMMER_INODE_ITIMES;
1420 }
1421 if (vap->va_mode != (mode_t)VNOVAL) {
1422 if (ip->ino_data.mode != vap->va_mode) {
1423 ip->ino_data.mode = vap->va_mode;
1424 modflags |= HAMMER_INODE_DDIRTY;
1425 }
1426 }
1427 done:
1428 if (error) {
1429 hammer_abort_transaction(&trans);
1430 } else {
1431 hammer_modify_inode(&trans, ip, modflags);
1432 hammer_commit_transaction(&trans);
1433 }
1434 return (error);
1435 }
1436
1437 /*
1438 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
1439 */
1440 static
1441 int
1442 hammer_vop_nsymlink(struct vop_nsymlink_args *ap)
1443 {
1444 struct hammer_transaction trans;
1445 struct hammer_inode *dip;
1446 struct hammer_inode *nip;
1447 struct nchandle *nch;
1448 hammer_record_t record;
1449 int error;
1450 int bytes;
1451
1452 ap->a_vap->va_type = VLNK;
1453
1454 nch = ap->a_nch;
1455 dip = VTOI(ap->a_dvp);
1456
1457 if (dip->flags & HAMMER_INODE_RO)
1458 return (EROFS);
1459
1460 /*
1461 * Create a transaction to cover the operations we perform.
1462 */
1463 hammer_start_transaction(&trans, dip->hmp);
1464
1465 /*
1466 * Create a new filesystem object of the requested type. The
1467 * returned inode will be referenced but not locked.
1468 */
1469
1470 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, dip, &nip);
1471 if (error) {
1472 hammer_abort_transaction(&trans);
1473 *ap->a_vpp = NULL;
1474 return (error);
1475 }
1476
1477 /*
1478 * Add the new filesystem object to the directory. This will also
1479 * bump the inode's link count.
1480 */
1481 error = hammer_ip_add_directory(&trans, dip, nch->ncp, nip);
1482
1483 /*
1484 * Add a record representing the symlink. symlink stores the link
1485 * as pure data, not a string, and is no \0 terminated.
1486 */
1487 if (error == 0) {
1488 record = hammer_alloc_mem_record(nip);
1489 bytes = strlen(ap->a_target);
1490
1491 record->rec.base.base.key = HAMMER_FIXKEY_SYMLINK;
1492 record->rec.base.base.rec_type = HAMMER_RECTYPE_FIX;
1493 record->rec.base.data_len = bytes;
1494 record->data = (void *)ap->a_target;
1495 /* will be reallocated by routine below */
1496 error = hammer_ip_add_record(&trans, record);
1497
1498 /*
1499 * Set the file size to the length of the link.
1500 */
1501 if (error == 0) {
1502 nip->ino_rec.ino_size = bytes;
1503 hammer_modify_inode(&trans, nip, HAMMER_INODE_RDIRTY);
1504 }
1505 }
1506
1507 /*
1508 * Finish up.
1509 */
1510 if (error) {
1511 hammer_rel_inode(nip, 0);
1512 hammer_abort_transaction(&trans);
1513 *ap->a_vpp = NULL;
1514 } else {
1515 hammer_commit_transaction(&trans);
1516 error = hammer_get_vnode(nip, LK_EXCLUSIVE, ap->a_vpp);
1517 hammer_rel_inode(nip, 0);
1518 if (error == 0) {
1519 cache_setunresolved(ap->a_nch);
1520 cache_setvp(ap->a_nch, *ap->a_vpp);
1521 }
1522 }
1523 return (error);
1524 }
1525
1526 /*
1527 * hammer_vop_nwhiteout { nch, dvp, cred, flags }
1528 */
1529 static
1530 int
1531 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap)
1532 {
1533 return(hammer_dounlink(ap->a_nch, ap->a_dvp, ap->a_cred, ap->a_flags));
1534 }
1535
1536 /*
1537 * hammer_vop_ioctl { vp, command, data, fflag, cred }
1538 */
1539 static
1540 int
1541 hammer_vop_ioctl(struct vop_ioctl_args *ap)
1542 {
1543 struct hammer_inode *ip = ap->a_vp->v_data;
1544
1545 return(hammer_ioctl(ip, ap->a_command, ap->a_data,
1546 ap->a_fflag, ap->a_cred));
1547 }
1548
1549 static
1550 int
1551 hammer_vop_mountctl(struct vop_mountctl_args *ap)
1552 {
1553 struct mount *mp;
1554 int error;
1555
1556 mp = ap->a_head.a_ops->head.vv_mount;
1557
1558 switch(ap->a_op) {
1559 case MOUNTCTL_SET_EXPORT:
1560 if (ap->a_ctllen != sizeof(struct export_args))
1561 error = EINVAL;
1562 error = hammer_vfs_export(mp, ap->a_op,
1563 (const struct export_args *)ap->a_ctl);
1564 break;
1565 default:
1566 error = journal_mountctl(ap);
1567 break;
1568 }
1569 return(error);
1570 }
1571
1572 /*
1573 * hammer_vop_strategy { vp, bio }
1574 *
1575 * Strategy call, used for regular file read & write only. Note that the
1576 * bp may represent a cluster.
1577 *
1578 * To simplify operation and allow better optimizations in the future,
1579 * this code does not make any assumptions with regards to buffer alignment
1580 * or size.
1581 */
1582 static
1583 int
1584 hammer_vop_strategy(struct vop_strategy_args *ap)
1585 {
1586 struct buf *bp;
1587 int error;
1588
1589 bp = ap->a_bio->bio_buf;
1590
1591 switch(bp->b_cmd) {
1592 case BUF_CMD_READ:
1593 error = hammer_vop_strategy_read(ap);
1594 break;
1595 case BUF_CMD_WRITE:
1596 error = hammer_vop_strategy_write(ap);
1597 break;
1598 default:
1599 error = EINVAL;
1600 break;
1601 }
1602 bp->b_error = error;
1603 if (error)
1604 bp->b_flags |= B_ERROR;
1605 biodone(ap->a_bio);
1606 return (error);
1607 }
1608
1609 /*
1610 * Read from a regular file. Iterate the related records and fill in the
1611 * BIO/BUF. Gaps are zero-filled.
1612 *
1613 * The support code in hammer_object.c should be used to deal with mixed
1614 * in-memory and on-disk records.
1615 *
1616 * XXX atime update
1617 */
1618 static
1619 int
1620 hammer_vop_strategy_read(struct vop_strategy_args *ap)
1621 {
1622 struct hammer_inode *ip = ap->a_vp->v_data;
1623 struct hammer_cursor cursor;
1624 hammer_record_ondisk_t rec;
1625 hammer_base_elm_t base;
1626 struct bio *bio;
1627 struct buf *bp;
1628 int64_t rec_offset;
1629 int64_t ran_end;
1630 int64_t tmp64;
1631 int error;
1632 int boff;
1633 int roff;
1634 int n;
1635
1636 bio = ap->a_bio;
1637 bp = bio->bio_buf;
1638
1639 hammer_init_cursor_hmp(&cursor, &ip->cache[0], ip->hmp);
1640
1641 /*
1642 * Key range (begin and end inclusive) to scan. Note that the key's
1643 * stored in the actual records represent BASE+LEN, not BASE. The
1644 * first record containing bio_offset will have a key > bio_offset.
1645 */
1646 cursor.key_beg.obj_id = ip->obj_id;
1647 cursor.key_beg.create_tid = 0;
1648 cursor.key_beg.delete_tid = 0;
1649 cursor.key_beg.obj_type = 0;
1650 cursor.key_beg.key = bio->bio_offset + 1;
1651 cursor.asof = ip->obj_asof;
1652 cursor.flags |= HAMMER_CURSOR_ASOF | HAMMER_CURSOR_DATAEXTOK;
1653
1654 cursor.key_end = cursor.key_beg;
1655 if (ip->ino_rec.base.base.obj_type == HAMMER_OBJTYPE_DBFILE) {
1656 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
1657 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
1658 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
1659 } else {
1660 ran_end = bio->bio_offset + bp->b_bufsize;
1661 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
1662 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
1663 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
1664 if (tmp64 < ran_end)
1665 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
1666 else
1667 cursor.key_end.key = ran_end + MAXPHYS + 1;
1668 }
1669 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
1670
1671 error = hammer_ip_first(&cursor, ip);
1672 boff = 0;
1673
1674 while (error == 0) {
1675 error = hammer_ip_resolve_data(&cursor);
1676 if (error)
1677 break;
1678 rec = cursor.record;
1679 base = &rec->base.base;
1680
1681 rec_offset = base->key - rec->data.base.data_len;
1682
1683 /*
1684 * Calculate the gap, if any, and zero-fill it.
1685 */
1686 n = (int)(rec_offset - (bio->bio_offset + boff));
1687 if (n > 0) {
1688 if (n > bp->b_bufsize - boff)
1689 n = bp->b_bufsize - boff;
1690 bzero((char *)bp->b_data + boff, n);
1691 boff += n;
1692 n = 0;
1693 }
1694
1695 /*
1696 * Calculate the data offset in the record and the number
1697 * of bytes we can copy.
1698 *
1699 * Note there is a degenerate case here where boff may
1700 * already be at bp->b_bufsize.
1701 */
1702 roff = -n;
1703 n = rec->data.base.data_len - roff;
1704 KKASSERT(n > 0);
1705 if (n > bp->b_bufsize - boff)
1706 n = bp->b_bufsize - boff;
1707 bcopy((char *)cursor.data + roff,
1708 (char *)bp->b_data + boff, n);
1709 boff += n;
1710 if (boff == bp->b_bufsize)
1711 break;
1712 error = hammer_ip_next(&cursor);
1713 }
1714 hammer_done_cursor(&cursor);
1715
1716 /*
1717 * There may have been a gap after the last record
1718 */
1719 if (error == ENOENT)
1720 error = 0;
1721 if (error == 0 && boff != bp->b_bufsize) {
1722 KKASSERT(boff < bp->b_bufsize);
1723 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
1724 /* boff = bp->b_bufsize; */
1725 }
1726 bp->b_resid = 0;
1727 return(error);
1728 }
1729
1730 /*
1731 * Write to a regular file. Iterate the related records and mark for
1732 * deletion. If existing edge records (left and right side) overlap our
1733 * write they have to be marked deleted and new records created, usually
1734 * referencing a portion of the original data. Then add a record to
1735 * represent the buffer.
1736 *
1737 * The support code in hammer_object.c should be used to deal with mixed
1738 * in-memory and on-disk records.
1739 */
1740 static
1741 int
1742 hammer_vop_strategy_write(struct vop_strategy_args *ap)
1743 {
1744 struct hammer_transaction trans;
1745 hammer_inode_t ip;
1746 struct bio *bio;
1747 struct buf *bp;
1748 int error;
1749
1750 bio = ap->a_bio;
1751 bp = bio->bio_buf;
1752 ip = ap->a_vp->v_data;
1753
1754 if (ip->flags & HAMMER_INODE_RO)
1755 return (EROFS);
1756
1757 /*
1758 * Start a transaction using the TID stored with the bp.
1759 */
1760 KKASSERT(bp->b_tid != 0);
1761 hammer_start_transaction_tid(&trans, ip->hmp, bp->b_tid);
1762
1763 /*
1764 * Delete any records overlapping our range. This function will
1765 * (eventually) properly truncate partial overlaps.
1766 */
1767 if (ip->ino_rec.base.base.obj_type == HAMMER_OBJTYPE_DBFILE) {
1768 error = hammer_ip_delete_range(&trans, ip, bio->bio_offset,
1769 bio->bio_offset);
1770 } else {
1771 error = hammer_ip_delete_range(&trans, ip, bio->bio_offset,
1772 bio->bio_offset +
1773 bp->b_bufsize - 1);
1774 }
1775
1776 /*
1777 * Add a single record to cover the write
1778 */
1779 if (error == 0) {
1780 error = hammer_ip_sync_data(&trans, ip, bio->bio_offset,
1781 bp->b_data, bp->b_bufsize);
1782 }
1783
1784 /*
1785 * If an error occured abort the transaction
1786 */
1787 if (error) {
1788 /* XXX undo deletion */
1789 hammer_abort_transaction(&trans);
1790 bp->b_resid = bp->b_bufsize;
1791 } else {
1792 hammer_commit_transaction(&trans);
1793 bp->b_resid = 0;
1794 bp->b_tid = 0;
1795 }
1796 return(error);
1797 }
1798
1799 /*
1800 * dounlink - disconnect a directory entry
1801 *
1802 * XXX whiteout support not really in yet
1803 */
1804 static int
1805 hammer_dounlink(struct nchandle *nch, struct vnode *dvp, struct ucred *cred,
1806 int flags)
1807 {
1808 struct hammer_transaction trans;
1809 struct namecache *ncp;
1810 hammer_inode_t dip;
1811 hammer_inode_t ip;
1812 hammer_record_ondisk_t rec;
1813 struct hammer_cursor cursor;
1814 int64_t namekey;
1815 int error;
1816
1817 /*
1818 * Calculate the namekey and setup the key range for the scan. This
1819 * works kinda like a chained hash table where the lower 32 bits
1820 * of the namekey synthesize the chain.
1821 *
1822 * The key range is inclusive of both key_beg and key_end.
1823 */
1824 dip = VTOI(dvp);
1825 ncp = nch->ncp;
1826
1827 if (dip->flags & HAMMER_INODE_RO)
1828 return (EROFS);
1829
1830 hammer_start_transaction(&trans, dip->hmp);
1831
1832 namekey = hammer_directory_namekey(ncp->nc_name, ncp->nc_nlen);
1833 retry:
1834 hammer_init_cursor_hmp(&cursor, &dip->cache[0], dip->hmp);
1835 cursor.key_beg.obj_id = dip->obj_id;
1836 cursor.key_beg.key = namekey;
1837 cursor.key_beg.create_tid = 0;
1838 cursor.key_beg.delete_tid = 0;
1839 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1840 cursor.key_beg.obj_type = 0;
1841
1842 cursor.key_end = cursor.key_beg;
1843 cursor.key_end.key |= 0xFFFFFFFFULL;
1844 cursor.asof = dip->obj_asof;
1845 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1846
1847 /*
1848 * Scan all matching records (the chain), locate the one matching
1849 * the requested path component. info->last_error contains the
1850 * error code on search termination and could be 0, ENOENT, or
1851 * something else.
1852 *
1853 * The hammer_ip_*() functions merge in-memory records with on-disk
1854 * records for the purposes of the search.
1855 */
1856 error = hammer_ip_first(&cursor, dip);
1857 while (error == 0) {
1858 error = hammer_ip_resolve_data(&cursor);
1859 if (error)
1860 break;
1861 rec = cursor.record;
1862 if (ncp->nc_nlen == rec->entry.base.data_len &&
1863 bcmp(ncp->nc_name, cursor.data, ncp->nc_nlen) == 0) {
1864 break;
1865 }
1866 error = hammer_ip_next(&cursor);
1867 }
1868
1869 /*
1870 * If all is ok we have to get the inode so we can adjust nlinks.
1871 *
1872 * If the target is a directory, it must be empty.
1873 */
1874 if (error == 0) {
1875 ip = hammer_get_inode(dip->hmp, &dip->cache[1],
1876 rec->entry.obj_id,
1877 dip->hmp->asof, 0, &error);
1878 if (error == ENOENT) {
1879 kprintf("obj_id %016llx\n", rec->entry.obj_id);
1880 Debugger("ENOENT unlinking object that should exist, cont to sync");
1881 hammer_sync_hmp(dip->hmp, MNT_NOWAIT);
1882 Debugger("ENOENT - sync done");
1883 }
1884 if (error == 0 && ip->ino_rec.base.base.obj_type ==
1885 HAMMER_OBJTYPE_DIRECTORY) {
1886 error = hammer_ip_check_directory_empty(&trans, ip);
1887 }
1888 /*
1889 * WARNING: hammer_ip_del_directory() may have to terminate
1890 * the cursor to avoid a lock recursion. It's ok to call
1891 * hammer_done_cursor() twice.
1892 */
1893 if (error == 0)
1894 error = hammer_ip_del_directory(&trans, &cursor, dip, ip);
1895 if (error == 0) {
1896 cache_setunresolved(nch);
1897 cache_setvp(nch, NULL);
1898 /* XXX locking */
1899 if (ip->vp)
1900 cache_inval_vp(ip->vp, CINV_DESTROY);
1901 }
1902 hammer_rel_inode(ip, 0);
1903 }
1904 hammer_done_cursor(&cursor);
1905 if (error == EDEADLK)
1906 goto retry;
1907
1908 if (error == 0)
1909 hammer_commit_transaction(&trans);
1910 else
1911 hammer_abort_transaction(&trans);
1912 return (error);
1913 }
1914
1915 /************************************************************************
1916 * FIFO AND SPECFS OPS *
1917 ************************************************************************
1918 *
1919 */
1920
1921 static int
1922 hammer_vop_fifoclose (struct vop_close_args *ap)
1923 {
1924 /* XXX update itimes */
1925 return (VOCALL(&fifo_vnode_vops, &ap->a_head));
1926 }
1927
1928 static int
1929 hammer_vop_fiforead (struct vop_read_args *ap)
1930 {
1931 int error;
1932
1933 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
1934 /* XXX update access time */
1935 return (error);
1936 }
1937
1938 static int
1939 hammer_vop_fifowrite (struct vop_write_args *ap)
1940 {
1941 int error;
1942
1943 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
1944 /* XXX update access time */
1945 return (error);
1946 }
1947
1948 static int
1949 hammer_vop_specclose (struct vop_close_args *ap)
1950 {
1951 /* XXX update itimes */
1952 return (VOCALL(&spec_vnode_vops, &ap->a_head));
1953 }
1954
1955 static int
1956 hammer_vop_specread (struct vop_read_args *ap)
1957 {
1958 /* XXX update access time */
1959 return (VOCALL(&spec_vnode_vops, &ap->a_head));
1960 }
1961
1962 static int
1963 hammer_vop_specwrite (struct vop_write_args *ap)
1964 {
1965 /* XXX update last change time */
1966 return (VOCALL(&spec_vnode_vops, &ap->a_head));
1967 }
1968
DragonFly BSD