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AMD64 - Fix many compile-time warnings. int/ptr type mismatches, %llx, etc.
[dragonfly.git] / sys / vfs / hammer / hammer_vnops.c
blob65f59f2aaaec43c33631b6e4f4e3c3ee7c2f4d02
1 /*
2 * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $DragonFly: src/sys/vfs/hammer/hammer_vnops.c,v 1.102 2008/10/16 17:24:16 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 <sys/file.h>
48 #include <vm/vm_extern.h>
49 #include <vfs/fifofs/fifo.h>
50 #include "hammer.h"
51
52 /*
53 * USERFS VNOPS
54 */
55 /*static int hammer_vop_vnoperate(struct vop_generic_args *);*/
56 static int hammer_vop_fsync(struct vop_fsync_args *);
57 static int hammer_vop_read(struct vop_read_args *);
58 static int hammer_vop_write(struct vop_write_args *);
59 static int hammer_vop_access(struct vop_access_args *);
60 static int hammer_vop_advlock(struct vop_advlock_args *);
61 static int hammer_vop_close(struct vop_close_args *);
62 static int hammer_vop_ncreate(struct vop_ncreate_args *);
63 static int hammer_vop_getattr(struct vop_getattr_args *);
64 static int hammer_vop_nresolve(struct vop_nresolve_args *);
65 static int hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *);
66 static int hammer_vop_nlink(struct vop_nlink_args *);
67 static int hammer_vop_nmkdir(struct vop_nmkdir_args *);
68 static int hammer_vop_nmknod(struct vop_nmknod_args *);
69 static int hammer_vop_open(struct vop_open_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_markatime(struct vop_markatime_args *);
77 static int hammer_vop_setattr(struct vop_setattr_args *);
78 static int hammer_vop_strategy(struct vop_strategy_args *);
79 static int hammer_vop_bmap(struct vop_bmap_args *ap);
80 static int hammer_vop_nsymlink(struct vop_nsymlink_args *);
81 static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *);
82 static int hammer_vop_ioctl(struct vop_ioctl_args *);
83 static int hammer_vop_mountctl(struct vop_mountctl_args *);
84 static int hammer_vop_kqfilter (struct vop_kqfilter_args *);
85
86 static int hammer_vop_fifoclose (struct vop_close_args *);
87 static int hammer_vop_fiforead (struct vop_read_args *);
88 static int hammer_vop_fifowrite (struct vop_write_args *);
89 static int hammer_vop_fifokqfilter (struct vop_kqfilter_args *);
90
91 static int hammer_vop_specclose (struct vop_close_args *);
92 static int hammer_vop_specread (struct vop_read_args *);
93 static int hammer_vop_specwrite (struct vop_write_args *);
94 static int hammer_vop_specgetattr (struct vop_getattr_args *);
95
96 struct vop_ops hammer_vnode_vops = {
97 .vop_default = vop_defaultop,
98 .vop_fsync = hammer_vop_fsync,
99 .vop_getpages = vop_stdgetpages,
100 .vop_putpages = vop_stdputpages,
101 .vop_read = hammer_vop_read,
102 .vop_write = hammer_vop_write,
103 .vop_access = hammer_vop_access,
104 .vop_advlock = hammer_vop_advlock,
105 .vop_close = hammer_vop_close,
106 .vop_ncreate = hammer_vop_ncreate,
107 .vop_getattr = hammer_vop_getattr,
108 .vop_inactive = hammer_vop_inactive,
109 .vop_reclaim = hammer_vop_reclaim,
110 .vop_nresolve = hammer_vop_nresolve,
111 .vop_nlookupdotdot = hammer_vop_nlookupdotdot,
112 .vop_nlink = hammer_vop_nlink,
113 .vop_nmkdir = hammer_vop_nmkdir,
114 .vop_nmknod = hammer_vop_nmknod,
115 .vop_open = hammer_vop_open,
116 .vop_pathconf = vop_stdpathconf,
117 .vop_print = hammer_vop_print,
118 .vop_readdir = hammer_vop_readdir,
119 .vop_readlink = hammer_vop_readlink,
120 .vop_nremove = hammer_vop_nremove,
121 .vop_nrename = hammer_vop_nrename,
122 .vop_nrmdir = hammer_vop_nrmdir,
123 .vop_markatime = hammer_vop_markatime,
124 .vop_setattr = hammer_vop_setattr,
125 .vop_bmap = hammer_vop_bmap,
126 .vop_strategy = hammer_vop_strategy,
127 .vop_nsymlink = hammer_vop_nsymlink,
128 .vop_nwhiteout = hammer_vop_nwhiteout,
129 .vop_ioctl = hammer_vop_ioctl,
130 .vop_mountctl = hammer_vop_mountctl,
131 .vop_kqfilter = hammer_vop_kqfilter
132 };
133
134 struct vop_ops hammer_spec_vops = {
135 .vop_default = spec_vnoperate,
136 .vop_fsync = hammer_vop_fsync,
137 .vop_read = hammer_vop_specread,
138 .vop_write = hammer_vop_specwrite,
139 .vop_access = hammer_vop_access,
140 .vop_close = hammer_vop_specclose,
141 .vop_markatime = hammer_vop_markatime,
142 .vop_getattr = hammer_vop_specgetattr,
143 .vop_inactive = hammer_vop_inactive,
144 .vop_reclaim = hammer_vop_reclaim,
145 .vop_setattr = hammer_vop_setattr
146 };
147
148 struct vop_ops hammer_fifo_vops = {
149 .vop_default = fifo_vnoperate,
150 .vop_fsync = hammer_vop_fsync,
151 .vop_read = hammer_vop_fiforead,
152 .vop_write = hammer_vop_fifowrite,
153 .vop_access = hammer_vop_access,
154 .vop_close = hammer_vop_fifoclose,
155 .vop_markatime = hammer_vop_markatime,
156 .vop_getattr = hammer_vop_getattr,
157 .vop_inactive = hammer_vop_inactive,
158 .vop_reclaim = hammer_vop_reclaim,
159 .vop_setattr = hammer_vop_setattr,
160 .vop_kqfilter = hammer_vop_fifokqfilter
161 };
162
163 static __inline
164 void
165 hammer_knote(struct vnode *vp, int flags)
166 {
167 if (flags)
168 KNOTE(&vp->v_pollinfo.vpi_selinfo.si_note, flags);
169 }
170
171 #ifdef DEBUG_TRUNCATE
172 struct hammer_inode *HammerTruncIp;
173 #endif
174
175 static int hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
176 struct vnode *dvp, struct ucred *cred,
177 int flags, int isdir);
178 static int hammer_vop_strategy_read(struct vop_strategy_args *ap);
179 static int hammer_vop_strategy_write(struct vop_strategy_args *ap);
180
181 #if 0
182 static
183 int
184 hammer_vop_vnoperate(struct vop_generic_args *)
185 {
186 return (VOCALL(&hammer_vnode_vops, ap));
187 }
188 #endif
189
190 /*
191 * hammer_vop_fsync { vp, waitfor }
192 *
193 * fsync() an inode to disk and wait for it to be completely committed
194 * such that the information would not be undone if a crash occured after
195 * return.
196 */
197 static
198 int
199 hammer_vop_fsync(struct vop_fsync_args *ap)
200 {
201 hammer_inode_t ip = VTOI(ap->a_vp);
202
203 ++hammer_count_fsyncs;
204 vfsync(ap->a_vp, ap->a_waitfor, 1, NULL, NULL);
205 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
206 if (ap->a_waitfor == MNT_WAIT) {
207 vn_unlock(ap->a_vp);
208 hammer_wait_inode(ip);
209 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
210 }
211 return (ip->error);
212 }
213
214 /*
215 * hammer_vop_read { vp, uio, ioflag, cred }
216 */
217 static
218 int
219 hammer_vop_read(struct vop_read_args *ap)
220 {
221 struct hammer_transaction trans;
222 hammer_inode_t ip;
223 off_t offset;
224 struct buf *bp;
225 struct uio *uio;
226 int error;
227 int n;
228 int seqcount;
229 int ioseqcount;
230 int blksize;
231
232 if (ap->a_vp->v_type != VREG)
233 return (EINVAL);
234 ip = VTOI(ap->a_vp);
235 error = 0;
236 uio = ap->a_uio;
237
238 /*
239 * Allow the UIO's size to override the sequential heuristic.
240 */
241 blksize = hammer_blocksize(uio->uio_offset);
242 seqcount = (uio->uio_resid + (blksize - 1)) / blksize;
243 ioseqcount = ap->a_ioflag >> 16;
244 if (seqcount < ioseqcount)
245 seqcount = ioseqcount;
246
247 hammer_start_transaction(&trans, ip->hmp);
248
249 /*
250 * Access the data typically in HAMMER_BUFSIZE blocks via the
251 * buffer cache, but HAMMER may use a variable block size based
252 * on the offset.
253 */
254 while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) {
255 int64_t base_offset;
256 int64_t file_limit;
257
258 blksize = hammer_blocksize(uio->uio_offset);
259 offset = (int)uio->uio_offset & (blksize - 1);
260 base_offset = uio->uio_offset - offset;
261
262 if (hammer_cluster_enable) {
263 /*
264 * Use file_limit to prevent cluster_read() from
265 * creating buffers of the wrong block size past
266 * the demarc.
267 */
268 file_limit = ip->ino_data.size;
269 if (base_offset < HAMMER_XDEMARC &&
270 file_limit > HAMMER_XDEMARC) {
271 file_limit = HAMMER_XDEMARC;
272 }
273 error = cluster_read(ap->a_vp,
274 file_limit, base_offset,
275 blksize, MAXPHYS,
276 seqcount, &bp);
277 } else {
278 error = bread(ap->a_vp, base_offset, blksize, &bp);
279 }
280 if (error) {
281 kprintf("error %d\n", error);
282 brelse(bp);
283 break;
284 }
285
286 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
287 n = blksize - offset;
288 if (n > uio->uio_resid)
289 n = uio->uio_resid;
290 if (n > ip->ino_data.size - uio->uio_offset)
291 n = (int)(ip->ino_data.size - uio->uio_offset);
292 error = uiomove((char *)bp->b_data + offset, n, uio);
293
294 /* data has a lower priority then meta-data */
295 bp->b_flags |= B_AGE;
296 bqrelse(bp);
297 if (error)
298 break;
299 hammer_stats_file_read += n;
300 }
301 if ((ip->flags & HAMMER_INODE_RO) == 0 &&
302 (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) {
303 ip->ino_data.atime = trans.time;
304 hammer_modify_inode(ip, HAMMER_INODE_ATIME);
305 }
306 hammer_done_transaction(&trans);
307 return (error);
308 }
309
310 /*
311 * hammer_vop_write { vp, uio, ioflag, cred }
312 */
313 static
314 int
315 hammer_vop_write(struct vop_write_args *ap)
316 {
317 struct hammer_transaction trans;
318 struct hammer_inode *ip;
319 hammer_mount_t hmp;
320 struct uio *uio;
321 int offset;
322 off_t base_offset;
323 struct buf *bp;
324 int kflags;
325 int error;
326 int n;
327 int flags;
328 int delta;
329 int seqcount;
330
331 if (ap->a_vp->v_type != VREG)
332 return (EINVAL);
333 ip = VTOI(ap->a_vp);
334 hmp = ip->hmp;
335 error = 0;
336 kflags = 0;
337 seqcount = ap->a_ioflag >> 16;
338
339 if (ip->flags & HAMMER_INODE_RO)
340 return (EROFS);
341
342 /*
343 * Create a transaction to cover the operations we perform.
344 */
345 hammer_start_transaction(&trans, hmp);
346 uio = ap->a_uio;
347
348 /*
349 * Check append mode
350 */
351 if (ap->a_ioflag & IO_APPEND)
352 uio->uio_offset = ip->ino_data.size;
353
354 /*
355 * Check for illegal write offsets. Valid range is 0...2^63-1.
356 *
357 * NOTE: the base_off assignment is required to work around what
358 * I consider to be a GCC-4 optimization bug.
359 */
360 if (uio->uio_offset < 0) {
361 hammer_done_transaction(&trans);
362 return (EFBIG);
363 }
364 base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */
365 if (uio->uio_resid > 0 && base_offset <= 0) {
366 hammer_done_transaction(&trans);
367 return (EFBIG);
368 }
369
370 /*
371 * Access the data typically in HAMMER_BUFSIZE blocks via the
372 * buffer cache, but HAMMER may use a variable block size based
373 * on the offset.
374 */
375 while (uio->uio_resid > 0) {
376 int fixsize = 0;
377 int blksize;
378 int blkmask;
379
380 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0)
381 break;
382
383 blksize = hammer_blocksize(uio->uio_offset);
384
385 /*
386 * Do not allow HAMMER to blow out the buffer cache. Very
387 * large UIOs can lockout other processes due to bwillwrite()
388 * mechanics.
389 *
390 * The hammer inode is not locked during these operations.
391 * The vnode is locked which can interfere with the pageout
392 * daemon for non-UIO_NOCOPY writes but should not interfere
393 * with the buffer cache. Even so, we cannot afford to
394 * allow the pageout daemon to build up too many dirty buffer
395 * cache buffers.
396 *
397 * Only call this if we aren't being recursively called from
398 * a virtual disk device (vn), else we may deadlock.
399 */
400 if ((ap->a_ioflag & IO_RECURSE) == 0)
401 bwillwrite(blksize);
402
403 /*
404 * Do not allow HAMMER to blow out system memory by
405 * accumulating too many records. Records are so well
406 * decoupled from the buffer cache that it is possible
407 * for userland to push data out to the media via
408 * direct-write, but build up the records queued to the
409 * backend faster then the backend can flush them out.
410 * HAMMER has hit its write limit but the frontend has
411 * no pushback to slow it down.
412 */
413 if (hmp->rsv_recs > hammer_limit_recs / 2) {
414 /*
415 * Get the inode on the flush list
416 */
417 if (ip->rsv_recs >= 64)
418 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
419 else if (ip->rsv_recs >= 16)
420 hammer_flush_inode(ip, 0);
421
422 /*
423 * Keep the flusher going if the system keeps
424 * queueing records.
425 */
426 delta = hmp->count_newrecords -
427 hmp->last_newrecords;
428 if (delta < 0 || delta > hammer_limit_recs / 2) {
429 hmp->last_newrecords = hmp->count_newrecords;
430 hammer_sync_hmp(hmp, MNT_NOWAIT);
431 }
432
433 /*
434 * If we have gotten behind start slowing
435 * down the writers.
436 */
437 delta = (hmp->rsv_recs - hammer_limit_recs) *
438 hz / hammer_limit_recs;
439 if (delta > 0)
440 tsleep(&trans, 0, "hmrslo", delta);
441 }
442
443 /*
444 * Calculate the blocksize at the current offset and figure
445 * out how much we can actually write.
446 */
447 blkmask = blksize - 1;
448 offset = (int)uio->uio_offset & blkmask;
449 base_offset = uio->uio_offset & ~(int64_t)blkmask;
450 n = blksize - offset;
451 if (n > uio->uio_resid)
452 n = uio->uio_resid;
453 if (uio->uio_offset + n > ip->ino_data.size) {
454 vnode_pager_setsize(ap->a_vp, uio->uio_offset + n);
455 fixsize = 1;
456 kflags |= NOTE_EXTEND;
457 }
458
459 if (uio->uio_segflg == UIO_NOCOPY) {
460 /*
461 * Issuing a write with the same data backing the
462 * buffer. Instantiate the buffer to collect the
463 * backing vm pages, then read-in any missing bits.
464 *
465 * This case is used by vop_stdputpages().
466 */
467 bp = getblk(ap->a_vp, base_offset,
468 blksize, GETBLK_BHEAVY, 0);
469 if ((bp->b_flags & B_CACHE) == 0) {
470 bqrelse(bp);
471 error = bread(ap->a_vp, base_offset,
472 blksize, &bp);
473 }
474 } else if (offset == 0 && uio->uio_resid >= blksize) {
475 /*
476 * Even though we are entirely overwriting the buffer
477 * we may still have to zero it out to avoid a
478 * mmap/write visibility issue.
479 */
480 bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0);
481 if ((bp->b_flags & B_CACHE) == 0)
482 vfs_bio_clrbuf(bp);
483 } else if (base_offset >= ip->ino_data.size) {
484 /*
485 * If the base offset of the buffer is beyond the
486 * file EOF, we don't have to issue a read.
487 */
488 bp = getblk(ap->a_vp, base_offset,
489 blksize, GETBLK_BHEAVY, 0);
490 vfs_bio_clrbuf(bp);
491 } else {
492 /*
493 * Partial overwrite, read in any missing bits then
494 * replace the portion being written.
495 */
496 error = bread(ap->a_vp, base_offset, blksize, &bp);
497 if (error == 0)
498 bheavy(bp);
499 }
500 if (error == 0) {
501 error = uiomove((char *)bp->b_data + offset,
502 n, uio);
503 }
504
505 /*
506 * If we screwed up we have to undo any VM size changes we
507 * made.
508 */
509 if (error) {
510 brelse(bp);
511 if (fixsize) {
512 vtruncbuf(ap->a_vp, ip->ino_data.size,
513 hammer_blocksize(ip->ino_data.size));
514 }
515 break;
516 }
517 kflags |= NOTE_WRITE;
518 hammer_stats_file_write += n;
519 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
520 if (ip->ino_data.size < uio->uio_offset) {
521 ip->ino_data.size = uio->uio_offset;
522 flags = HAMMER_INODE_DDIRTY;
523 vnode_pager_setsize(ap->a_vp, ip->ino_data.size);
524 } else {
525 flags = 0;
526 }
527 ip->ino_data.mtime = trans.time;
528 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS;
529 hammer_modify_inode(ip, flags);
530
531 /*
532 * Once we dirty the buffer any cached zone-X offset
533 * becomes invalid. HAMMER NOTE: no-history mode cannot
534 * allow overwriting over the same data sector unless
535 * we provide UNDOs for the old data, which we don't.
536 */
537 bp->b_bio2.bio_offset = NOOFFSET;
538
539 /*
540 * Final buffer disposition.
541 */
542 bp->b_flags |= B_AGE;
543 if (ap->a_ioflag & IO_SYNC) {
544 bwrite(bp);
545 } else if (ap->a_ioflag & IO_DIRECT) {
546 bawrite(bp);
547 } else {
548 bdwrite(bp);
549 }
550 }
551 hammer_done_transaction(&trans);
552 hammer_knote(ap->a_vp, kflags);
553 return (error);
554 }
555
556 /*
557 * hammer_vop_access { vp, mode, cred }
558 */
559 static
560 int
561 hammer_vop_access(struct vop_access_args *ap)
562 {
563 struct hammer_inode *ip = VTOI(ap->a_vp);
564 uid_t uid;
565 gid_t gid;
566 int error;
567
568 ++hammer_stats_file_iopsr;
569 uid = hammer_to_unix_xid(&ip->ino_data.uid);
570 gid = hammer_to_unix_xid(&ip->ino_data.gid);
571
572 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
573 ip->ino_data.uflags);
574 return (error);
575 }
576
577 /*
578 * hammer_vop_advlock { vp, id, op, fl, flags }
579 */
580 static
581 int
582 hammer_vop_advlock(struct vop_advlock_args *ap)
583 {
584 hammer_inode_t ip = VTOI(ap->a_vp);
585
586 return (lf_advlock(ap, &ip->advlock, ip->ino_data.size));
587 }
588
589 /*
590 * hammer_vop_close { vp, fflag }
591 */
592 static
593 int
594 hammer_vop_close(struct vop_close_args *ap)
595 {
596 /*hammer_inode_t ip = VTOI(ap->a_vp);*/
597 return (vop_stdclose(ap));
598 }
599
600 /*
601 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
602 *
603 * The operating system has already ensured that the directory entry
604 * does not exist and done all appropriate namespace locking.
605 */
606 static
607 int
608 hammer_vop_ncreate(struct vop_ncreate_args *ap)
609 {
610 struct hammer_transaction trans;
611 struct hammer_inode *dip;
612 struct hammer_inode *nip;
613 struct nchandle *nch;
614 int error;
615
616 nch = ap->a_nch;
617 dip = VTOI(ap->a_dvp);
618
619 if (dip->flags & HAMMER_INODE_RO)
620 return (EROFS);
621 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
622 return (error);
623
624 /*
625 * Create a transaction to cover the operations we perform.
626 */
627 hammer_start_transaction(&trans, dip->hmp);
628 ++hammer_stats_file_iopsw;
629
630 /*
631 * Create a new filesystem object of the requested type. The
632 * returned inode will be referenced and shared-locked to prevent
633 * it from being moved to the flusher.
634 */
635 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
636 dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
637 NULL, &nip);
638 if (error) {
639 hkprintf("hammer_create_inode error %d\n", error);
640 hammer_done_transaction(&trans);
641 *ap->a_vpp = NULL;
642 return (error);
643 }
644
645 /*
646 * Add the new filesystem object to the directory. This will also
647 * bump the inode's link count.
648 */
649 error = hammer_ip_add_directory(&trans, dip,
650 nch->ncp->nc_name, nch->ncp->nc_nlen,
651 nip);
652 if (error)
653 hkprintf("hammer_ip_add_directory error %d\n", error);
654
655 /*
656 * Finish up.
657 */
658 if (error) {
659 hammer_rel_inode(nip, 0);
660 hammer_done_transaction(&trans);
661 *ap->a_vpp = NULL;
662 } else {
663 error = hammer_get_vnode(nip, ap->a_vpp);
664 hammer_done_transaction(&trans);
665 hammer_rel_inode(nip, 0);
666 if (error == 0) {
667 cache_setunresolved(ap->a_nch);
668 cache_setvp(ap->a_nch, *ap->a_vpp);
669 }
670 hammer_knote(ap->a_dvp, NOTE_WRITE);
671 }
672 return (error);
673 }
674
675 /*
676 * hammer_vop_getattr { vp, vap }
677 *
678 * Retrieve an inode's attribute information. When accessing inodes
679 * historically we fake the atime field to ensure consistent results.
680 * The atime field is stored in the B-Tree element and allowed to be
681 * updated without cycling the element.
682 */
683 static
684 int
685 hammer_vop_getattr(struct vop_getattr_args *ap)
686 {
687 struct hammer_inode *ip = VTOI(ap->a_vp);
688 struct vattr *vap = ap->a_vap;
689
690 /*
691 * We want the fsid to be different when accessing a filesystem
692 * with different as-of's so programs like diff don't think
693 * the files are the same.
694 *
695 * We also want the fsid to be the same when comparing snapshots,
696 * or when comparing mirrors (which might be backed by different
697 * physical devices). HAMMER fsids are based on the PFS's
698 * shared_uuid field.
699 *
700 * XXX there is a chance of collision here. The va_fsid reported
701 * by stat is different from the more involved fsid used in the
702 * mount structure.
703 */
704 ++hammer_stats_file_iopsr;
705 vap->va_fsid = ip->pfsm->fsid_udev ^ (u_int32_t)ip->obj_asof ^
706 (u_int32_t)(ip->obj_asof >> 32);
707
708 vap->va_fileid = ip->ino_leaf.base.obj_id;
709 vap->va_mode = ip->ino_data.mode;
710 vap->va_nlink = ip->ino_data.nlinks;
711 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
712 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
713 vap->va_rmajor = 0;
714 vap->va_rminor = 0;
715 vap->va_size = ip->ino_data.size;
716
717 /*
718 * Special case for @@PFS softlinks. The actual size of the
719 * expanded softlink is "@@0x%016llx:%05d" == 26 bytes.
720 * or for MAX_TID is "@@-1:%05d" == 10 bytes.
721 */
722 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK &&
723 ip->ino_data.size == 10 &&
724 ip->obj_asof == HAMMER_MAX_TID &&
725 ip->obj_localization == 0 &&
726 strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) {
727 if (ip->pfsm->pfsd.mirror_flags & HAMMER_PFSD_SLAVE)
728 vap->va_size = 26;
729 else
730 vap->va_size = 10;
731 }
732
733 /*
734 * We must provide a consistent atime and mtime for snapshots
735 * so people can do a 'tar cf - ... | md5' on them and get
736 * consistent results.
737 */
738 if (ip->flags & HAMMER_INODE_RO) {
739 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime);
740 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime);
741 } else {
742 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime);
743 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime);
744 }
745 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
746 vap->va_flags = ip->ino_data.uflags;
747 vap->va_gen = 1; /* hammer inums are unique for all time */
748 vap->va_blocksize = HAMMER_BUFSIZE;
749 if (ip->ino_data.size >= HAMMER_XDEMARC) {
750 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) &
751 ~HAMMER_XBUFMASK64;
752 } else if (ip->ino_data.size > HAMMER_BUFSIZE / 2) {
753 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) &
754 ~HAMMER_BUFMASK64;
755 } else {
756 vap->va_bytes = (ip->ino_data.size + 15) & ~15;
757 }
758
759 vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type);
760 vap->va_filerev = 0; /* XXX */
761 /* mtime uniquely identifies any adjustments made to the file XXX */
762 vap->va_fsmid = ip->ino_data.mtime;
763 vap->va_uid_uuid = ip->ino_data.uid;
764 vap->va_gid_uuid = ip->ino_data.gid;
765 vap->va_fsid_uuid = ip->hmp->fsid;
766 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
767 VA_FSID_UUID_VALID;
768
769 switch (ip->ino_data.obj_type) {
770 case HAMMER_OBJTYPE_CDEV:
771 case HAMMER_OBJTYPE_BDEV:
772 vap->va_rmajor = ip->ino_data.rmajor;
773 vap->va_rminor = ip->ino_data.rminor;
774 break;
775 default:
776 break;
777 }
778 return(0);
779 }
780
781 /*
782 * hammer_vop_nresolve { nch, dvp, cred }
783 *
784 * Locate the requested directory entry.
785 */
786 static
787 int
788 hammer_vop_nresolve(struct vop_nresolve_args *ap)
789 {
790 struct hammer_transaction trans;
791 struct namecache *ncp;
792 hammer_inode_t dip;
793 hammer_inode_t ip;
794 hammer_tid_t asof;
795 struct hammer_cursor cursor;
796 struct vnode *vp;
797 int64_t namekey;
798 int error;
799 int i;
800 int nlen;
801 int flags;
802 int ispfs;
803 int64_t obj_id;
804 u_int32_t localization;
805 u_int32_t max_iterations;
806
807 /*
808 * Misc initialization, plus handle as-of name extensions. Look for
809 * the '@@' extension. Note that as-of files and directories cannot
810 * be modified.
811 */
812 dip = VTOI(ap->a_dvp);
813 ncp = ap->a_nch->ncp;
814 asof = dip->obj_asof;
815 localization = dip->obj_localization; /* for code consistency */
816 nlen = ncp->nc_nlen;
817 flags = dip->flags & HAMMER_INODE_RO;
818 ispfs = 0;
819
820 hammer_simple_transaction(&trans, dip->hmp);
821 ++hammer_stats_file_iopsr;
822
823 for (i = 0; i < nlen; ++i) {
824 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
825 error = hammer_str_to_tid(ncp->nc_name + i + 2,
826 &ispfs, &asof, &localization);
827 if (error != 0) {
828 i = nlen;
829 break;
830 }
831 if (asof != HAMMER_MAX_TID)
832 flags |= HAMMER_INODE_RO;
833 break;
834 }
835 }
836 nlen = i;
837
838 /*
839 * If this is a PFS softlink we dive into the PFS
840 */
841 if (ispfs && nlen == 0) {
842 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT,
843 asof, localization,
844 flags, &error);
845 if (error == 0) {
846 error = hammer_get_vnode(ip, &vp);
847 hammer_rel_inode(ip, 0);
848 } else {
849 vp = NULL;
850 }
851 if (error == 0) {
852 vn_unlock(vp);
853 cache_setvp(ap->a_nch, vp);
854 vrele(vp);
855 }
856 goto done;
857 }
858
859 /*
860 * If there is no path component the time extension is relative to dip.
861 * e.g. "fubar/@@<snapshot>"
862 *
863 * "." is handled by the kernel, but ".@@<snapshot>" is not.
864 * e.g. "fubar/.@@<snapshot>"
865 *
866 * ".." is handled by the kernel. We do not currently handle
867 * "..@<snapshot>".
868 */
869 if (nlen == 0 || (nlen == 1 && ncp->nc_name[0] == '.')) {
870 ip = hammer_get_inode(&trans, dip, dip->obj_id,
871 asof, dip->obj_localization,
872 flags, &error);
873 if (error == 0) {
874 error = hammer_get_vnode(ip, &vp);
875 hammer_rel_inode(ip, 0);
876 } else {
877 vp = NULL;
878 }
879 if (error == 0) {
880 vn_unlock(vp);
881 cache_setvp(ap->a_nch, vp);
882 vrele(vp);
883 }
884 goto done;
885 }
886
887 /*
888 * Calculate the namekey and setup the key range for the scan. This
889 * works kinda like a chained hash table where the lower 32 bits
890 * of the namekey synthesize the chain.
891 *
892 * The key range is inclusive of both key_beg and key_end.
893 */
894 namekey = hammer_directory_namekey(dip, ncp->nc_name, nlen,
895 &max_iterations);
896
897 error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip);
898 cursor.key_beg.localization = dip->obj_localization +
899 HAMMER_LOCALIZE_MISC;
900 cursor.key_beg.obj_id = dip->obj_id;
901 cursor.key_beg.key = namekey;
902 cursor.key_beg.create_tid = 0;
903 cursor.key_beg.delete_tid = 0;
904 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
905 cursor.key_beg.obj_type = 0;
906
907 cursor.key_end = cursor.key_beg;
908 cursor.key_end.key += max_iterations;
909 cursor.asof = asof;
910 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
911
912 /*
913 * Scan all matching records (the chain), locate the one matching
914 * the requested path component.
915 *
916 * The hammer_ip_*() functions merge in-memory records with on-disk
917 * records for the purposes of the search.
918 */
919 obj_id = 0;
920 localization = HAMMER_DEF_LOCALIZATION;
921
922 if (error == 0) {
923 error = hammer_ip_first(&cursor);
924 while (error == 0) {
925 error = hammer_ip_resolve_data(&cursor);
926 if (error)
927 break;
928 if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF &&
929 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
930 obj_id = cursor.data->entry.obj_id;
931 localization = cursor.data->entry.localization;
932 break;
933 }
934 error = hammer_ip_next(&cursor);
935 }
936 }
937 hammer_done_cursor(&cursor);
938
939 /*
940 * Lookup the obj_id. This should always succeed. If it does not
941 * the filesystem may be damaged and we return a dummy inode.
942 */
943 if (error == 0) {
944 ip = hammer_get_inode(&trans, dip, obj_id,
945 asof, localization,
946 flags, &error);
947 if (error == ENOENT) {
948 kprintf("HAMMER: WARNING: Missing "
949 "inode for dirent \"%s\"\n"
950 "\tobj_id = %016llx\n",
951 ncp->nc_name, (long long)obj_id);
952 error = 0;
953 ip = hammer_get_dummy_inode(&trans, dip, obj_id,
954 asof, localization,
955 flags, &error);
956 }
957 if (error == 0) {
958 error = hammer_get_vnode(ip, &vp);
959 hammer_rel_inode(ip, 0);
960 } else {
961 vp = NULL;
962 }
963 if (error == 0) {
964 vn_unlock(vp);
965 cache_setvp(ap->a_nch, vp);
966 vrele(vp);
967 }
968 } else if (error == ENOENT) {
969 cache_setvp(ap->a_nch, NULL);
970 }
971 done:
972 hammer_done_transaction(&trans);
973 return (error);
974 }
975
976 /*
977 * hammer_vop_nlookupdotdot { dvp, vpp, cred }
978 *
979 * Locate the parent directory of a directory vnode.
980 *
981 * dvp is referenced but not locked. *vpp must be returned referenced and
982 * locked. A parent_obj_id of 0 does not necessarily indicate that we are
983 * at the root, instead it could indicate that the directory we were in was
984 * removed.
985 *
986 * NOTE: as-of sequences are not linked into the directory structure. If
987 * we are at the root with a different asof then the mount point, reload
988 * the same directory with the mount point's asof. I'm not sure what this
989 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not
990 * get confused, but it hasn't been tested.
991 */
992 static
993 int
994 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
995 {
996 struct hammer_transaction trans;
997 struct hammer_inode *dip;
998 struct hammer_inode *ip;
999 int64_t parent_obj_id;
1000 u_int32_t parent_obj_localization;
1001 hammer_tid_t asof;
1002 int error;
1003
1004 dip = VTOI(ap->a_dvp);
1005 asof = dip->obj_asof;
1006
1007 /*
1008 * Whos are parent? This could be the root of a pseudo-filesystem
1009 * whos parent is in another localization domain.
1010 */
1011 parent_obj_id = dip->ino_data.parent_obj_id;
1012 if (dip->obj_id == HAMMER_OBJID_ROOT)
1013 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization;
1014 else
1015 parent_obj_localization = dip->obj_localization;
1016
1017 if (parent_obj_id == 0) {
1018 if (dip->obj_id == HAMMER_OBJID_ROOT &&
1019 asof != dip->hmp->asof) {
1020 parent_obj_id = dip->obj_id;
1021 asof = dip->hmp->asof;
1022 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK);
1023 ksnprintf(*ap->a_fakename, 19, "0x%016llx",
1024 (long long)dip->obj_asof);
1025 } else {
1026 *ap->a_vpp = NULL;
1027 return ENOENT;
1028 }
1029 }
1030
1031 hammer_simple_transaction(&trans, dip->hmp);
1032 ++hammer_stats_file_iopsr;
1033
1034 ip = hammer_get_inode(&trans, dip, parent_obj_id,
1035 asof, parent_obj_localization,
1036 dip->flags, &error);
1037 if (ip) {
1038 error = hammer_get_vnode(ip, ap->a_vpp);
1039 hammer_rel_inode(ip, 0);
1040 } else {
1041 *ap->a_vpp = NULL;
1042 }
1043 hammer_done_transaction(&trans);
1044 return (error);
1045 }
1046
1047 /*
1048 * hammer_vop_nlink { nch, dvp, vp, cred }
1049 */
1050 static
1051 int
1052 hammer_vop_nlink(struct vop_nlink_args *ap)
1053 {
1054 struct hammer_transaction trans;
1055 struct hammer_inode *dip;
1056 struct hammer_inode *ip;
1057 struct nchandle *nch;
1058 int error;
1059
1060 if (ap->a_dvp->v_mount != ap->a_vp->v_mount)
1061 return(EXDEV);
1062
1063 nch = ap->a_nch;
1064 dip = VTOI(ap->a_dvp);
1065 ip = VTOI(ap->a_vp);
1066
1067 if (dip->obj_localization != ip->obj_localization)
1068 return(EXDEV);
1069
1070 if (dip->flags & HAMMER_INODE_RO)
1071 return (EROFS);
1072 if (ip->flags & HAMMER_INODE_RO)
1073 return (EROFS);
1074 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1075 return (error);
1076
1077 /*
1078 * Create a transaction to cover the operations we perform.
1079 */
1080 hammer_start_transaction(&trans, dip->hmp);
1081 ++hammer_stats_file_iopsw;
1082
1083 /*
1084 * Add the filesystem object to the directory. Note that neither
1085 * dip nor ip are referenced or locked, but their vnodes are
1086 * referenced. This function will bump the inode's link count.
1087 */
1088 error = hammer_ip_add_directory(&trans, dip,
1089 nch->ncp->nc_name, nch->ncp->nc_nlen,
1090 ip);
1091
1092 /*
1093 * Finish up.
1094 */
1095 if (error == 0) {
1096 cache_setunresolved(nch);
1097 cache_setvp(nch, ap->a_vp);
1098 }
1099 hammer_done_transaction(&trans);
1100 hammer_knote(ap->a_vp, NOTE_LINK);
1101 hammer_knote(ap->a_dvp, NOTE_WRITE);
1102 return (error);
1103 }
1104
1105 /*
1106 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
1107 *
1108 * The operating system has already ensured that the directory entry
1109 * does not exist and done all appropriate namespace locking.
1110 */
1111 static
1112 int
1113 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
1114 {
1115 struct hammer_transaction trans;
1116 struct hammer_inode *dip;
1117 struct hammer_inode *nip;
1118 struct nchandle *nch;
1119 int error;
1120
1121 nch = ap->a_nch;
1122 dip = VTOI(ap->a_dvp);
1123
1124 if (dip->flags & HAMMER_INODE_RO)
1125 return (EROFS);
1126 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1127 return (error);
1128
1129 /*
1130 * Create a transaction to cover the operations we perform.
1131 */
1132 hammer_start_transaction(&trans, dip->hmp);
1133 ++hammer_stats_file_iopsw;
1134
1135 /*
1136 * Create a new filesystem object of the requested type. The
1137 * returned inode will be referenced but not locked.
1138 */
1139 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1140 dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
1141 NULL, &nip);
1142 if (error) {
1143 hkprintf("hammer_mkdir error %d\n", error);
1144 hammer_done_transaction(&trans);
1145 *ap->a_vpp = NULL;
1146 return (error);
1147 }
1148 /*
1149 * Add the new filesystem object to the directory. This will also
1150 * bump the inode's link count.
1151 */
1152 error = hammer_ip_add_directory(&trans, dip,
1153 nch->ncp->nc_name, nch->ncp->nc_nlen,
1154 nip);
1155 if (error)
1156 hkprintf("hammer_mkdir (add) error %d\n", error);
1157
1158 /*
1159 * Finish up.
1160 */
1161 if (error) {
1162 hammer_rel_inode(nip, 0);
1163 *ap->a_vpp = NULL;
1164 } else {
1165 error = hammer_get_vnode(nip, ap->a_vpp);
1166 hammer_rel_inode(nip, 0);
1167 if (error == 0) {
1168 cache_setunresolved(ap->a_nch);
1169 cache_setvp(ap->a_nch, *ap->a_vpp);
1170 }
1171 }
1172 hammer_done_transaction(&trans);
1173 if (error == 0)
1174 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1175 return (error);
1176 }
1177
1178 /*
1179 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
1180 *
1181 * The operating system has already ensured that the directory entry
1182 * does not exist and done all appropriate namespace locking.
1183 */
1184 static
1185 int
1186 hammer_vop_nmknod(struct vop_nmknod_args *ap)
1187 {
1188 struct hammer_transaction trans;
1189 struct hammer_inode *dip;
1190 struct hammer_inode *nip;
1191 struct nchandle *nch;
1192 int error;
1193
1194 nch = ap->a_nch;
1195 dip = VTOI(ap->a_dvp);
1196
1197 if (dip->flags & HAMMER_INODE_RO)
1198 return (EROFS);
1199 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1200 return (error);
1201
1202 /*
1203 * Create a transaction to cover the operations we perform.
1204 */
1205 hammer_start_transaction(&trans, dip->hmp);
1206 ++hammer_stats_file_iopsw;
1207
1208 /*
1209 * Create a new filesystem object of the requested type. The
1210 * returned inode will be referenced but not locked.
1211 *
1212 * If mknod specifies a directory a pseudo-fs is created.
1213 */
1214 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1215 dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
1216 NULL, &nip);
1217 if (error) {
1218 hammer_done_transaction(&trans);
1219 *ap->a_vpp = NULL;
1220 return (error);
1221 }
1222
1223 /*
1224 * Add the new filesystem object to the directory. This will also
1225 * bump the inode's link count.
1226 */
1227 error = hammer_ip_add_directory(&trans, dip,
1228 nch->ncp->nc_name, nch->ncp->nc_nlen,
1229 nip);
1230
1231 /*
1232 * Finish up.
1233 */
1234 if (error) {
1235 hammer_rel_inode(nip, 0);
1236 *ap->a_vpp = NULL;
1237 } else {
1238 error = hammer_get_vnode(nip, ap->a_vpp);
1239 hammer_rel_inode(nip, 0);
1240 if (error == 0) {
1241 cache_setunresolved(ap->a_nch);
1242 cache_setvp(ap->a_nch, *ap->a_vpp);
1243 }
1244 }
1245 hammer_done_transaction(&trans);
1246 if (error == 0)
1247 hammer_knote(ap->a_dvp, NOTE_WRITE);
1248 return (error);
1249 }
1250
1251 /*
1252 * hammer_vop_open { vp, mode, cred, fp }
1253 */
1254 static
1255 int
1256 hammer_vop_open(struct vop_open_args *ap)
1257 {
1258 hammer_inode_t ip;
1259
1260 ++hammer_stats_file_iopsr;
1261 ip = VTOI(ap->a_vp);
1262
1263 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO))
1264 return (EROFS);
1265 return(vop_stdopen(ap));
1266 }
1267
1268 /*
1269 * hammer_vop_print { vp }
1270 */
1271 static
1272 int
1273 hammer_vop_print(struct vop_print_args *ap)
1274 {
1275 return EOPNOTSUPP;
1276 }
1277
1278 /*
1279 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
1280 */
1281 static
1282 int
1283 hammer_vop_readdir(struct vop_readdir_args *ap)
1284 {
1285 struct hammer_transaction trans;
1286 struct hammer_cursor cursor;
1287 struct hammer_inode *ip;
1288 struct uio *uio;
1289 hammer_base_elm_t base;
1290 int error;
1291 int cookie_index;
1292 int ncookies;
1293 off_t *cookies;
1294 off_t saveoff;
1295 int r;
1296 int dtype;
1297
1298 ++hammer_stats_file_iopsr;
1299 ip = VTOI(ap->a_vp);
1300 uio = ap->a_uio;
1301 saveoff = uio->uio_offset;
1302
1303 if (ap->a_ncookies) {
1304 ncookies = uio->uio_resid / 16 + 1;
1305 if (ncookies > 1024)
1306 ncookies = 1024;
1307 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
1308 cookie_index = 0;
1309 } else {
1310 ncookies = -1;
1311 cookies = NULL;
1312 cookie_index = 0;
1313 }
1314
1315 hammer_simple_transaction(&trans, ip->hmp);
1316
1317 /*
1318 * Handle artificial entries
1319 *
1320 * It should be noted that the minimum value for a directory
1321 * hash key on-media is 0x0000000100000000, so we can use anything
1322 * less then that to represent our 'special' key space.
1323 */
1324 error = 0;
1325 if (saveoff == 0) {
1326 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
1327 if (r)
1328 goto done;
1329 if (cookies)
1330 cookies[cookie_index] = saveoff;
1331 ++saveoff;
1332 ++cookie_index;
1333 if (cookie_index == ncookies)
1334 goto done;
1335 }
1336 if (saveoff == 1) {
1337 if (ip->ino_data.parent_obj_id) {
1338 r = vop_write_dirent(&error, uio,
1339 ip->ino_data.parent_obj_id,
1340 DT_DIR, 2, "..");
1341 } else {
1342 r = vop_write_dirent(&error, uio,
1343 ip->obj_id, DT_DIR, 2, "..");
1344 }
1345 if (r)
1346 goto done;
1347 if (cookies)
1348 cookies[cookie_index] = saveoff;
1349 ++saveoff;
1350 ++cookie_index;
1351 if (cookie_index == ncookies)
1352 goto done;
1353 }
1354
1355 /*
1356 * Key range (begin and end inclusive) to scan. Directory keys
1357 * directly translate to a 64 bit 'seek' position.
1358 */
1359 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1360 cursor.key_beg.localization = ip->obj_localization +
1361 HAMMER_LOCALIZE_MISC;
1362 cursor.key_beg.obj_id = ip->obj_id;
1363 cursor.key_beg.create_tid = 0;
1364 cursor.key_beg.delete_tid = 0;
1365 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1366 cursor.key_beg.obj_type = 0;
1367 cursor.key_beg.key = saveoff;
1368
1369 cursor.key_end = cursor.key_beg;
1370 cursor.key_end.key = HAMMER_MAX_KEY;
1371 cursor.asof = ip->obj_asof;
1372 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1373
1374 error = hammer_ip_first(&cursor);
1375
1376 while (error == 0) {
1377 error = hammer_ip_resolve_data(&cursor);
1378 if (error)
1379 break;
1380 base = &cursor.leaf->base;
1381 saveoff = base->key;
1382 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF);
1383
1384 if (base->obj_id != ip->obj_id)
1385 panic("readdir: bad record at %p", cursor.node);
1386
1387 /*
1388 * Convert pseudo-filesystems into softlinks
1389 */
1390 dtype = hammer_get_dtype(cursor.leaf->base.obj_type);
1391 r = vop_write_dirent(
1392 &error, uio, cursor.data->entry.obj_id,
1393 dtype,
1394 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF ,
1395 (void *)cursor.data->entry.name);
1396 if (r)
1397 break;
1398 ++saveoff;
1399 if (cookies)
1400 cookies[cookie_index] = base->key;
1401 ++cookie_index;
1402 if (cookie_index == ncookies)
1403 break;
1404 error = hammer_ip_next(&cursor);
1405 }
1406 hammer_done_cursor(&cursor);
1407
1408 done:
1409 hammer_done_transaction(&trans);
1410
1411 if (ap->a_eofflag)
1412 *ap->a_eofflag = (error == ENOENT);
1413 uio->uio_offset = saveoff;
1414 if (error && cookie_index == 0) {
1415 if (error == ENOENT)
1416 error = 0;
1417 if (cookies) {
1418 kfree(cookies, M_TEMP);
1419 *ap->a_ncookies = 0;
1420 *ap->a_cookies = NULL;
1421 }
1422 } else {
1423 if (error == ENOENT)
1424 error = 0;
1425 if (cookies) {
1426 *ap->a_ncookies = cookie_index;
1427 *ap->a_cookies = cookies;
1428 }
1429 }
1430 return(error);
1431 }
1432
1433 /*
1434 * hammer_vop_readlink { vp, uio, cred }
1435 */
1436 static
1437 int
1438 hammer_vop_readlink(struct vop_readlink_args *ap)
1439 {
1440 struct hammer_transaction trans;
1441 struct hammer_cursor cursor;
1442 struct hammer_inode *ip;
1443 char buf[32];
1444 u_int32_t localization;
1445 hammer_pseudofs_inmem_t pfsm;
1446 int error;
1447
1448 ip = VTOI(ap->a_vp);
1449
1450 /*
1451 * Shortcut if the symlink data was stuffed into ino_data.
1452 *
1453 * Also expand special "@@PFS%05d" softlinks (expansion only
1454 * occurs for non-historical (current) accesses made from the
1455 * primary filesystem).
1456 */
1457 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) {
1458 char *ptr;
1459 int bytes;
1460
1461 ptr = ip->ino_data.ext.symlink;
1462 bytes = (int)ip->ino_data.size;
1463 if (bytes == 10 &&
1464 ip->obj_asof == HAMMER_MAX_TID &&
1465 ip->obj_localization == 0 &&
1466 strncmp(ptr, "@@PFS", 5) == 0) {
1467 hammer_simple_transaction(&trans, ip->hmp);
1468 bcopy(ptr + 5, buf, 5);
1469 buf[5] = 0;
1470 localization = strtoul(buf, NULL, 10) << 16;
1471 pfsm = hammer_load_pseudofs(&trans, localization,
1472 &error);
1473 if (error == 0) {
1474 if (pfsm->pfsd.mirror_flags &
1475 HAMMER_PFSD_SLAVE) {
1476 /* vap->va_size == 26 */
1477 ksnprintf(buf, sizeof(buf),
1478 "@@0x%016llx:%05d",
1479 (long long)pfsm->pfsd.sync_end_tid,
1480 localization >> 16);
1481 } else {
1482 /* vap->va_size == 10 */
1483 ksnprintf(buf, sizeof(buf),
1484 "@@-1:%05d",
1485 localization >> 16);
1486 #if 0
1487 ksnprintf(buf, sizeof(buf),
1488 "@@0x%016llx:%05d",
1489 (long long)HAMMER_MAX_TID,
1490 localization >> 16);
1491 #endif
1492 }
1493 ptr = buf;
1494 bytes = strlen(buf);
1495 }
1496 if (pfsm)
1497 hammer_rel_pseudofs(trans.hmp, pfsm);
1498 hammer_done_transaction(&trans);
1499 }
1500 error = uiomove(ptr, bytes, ap->a_uio);
1501 return(error);
1502 }
1503
1504 /*
1505 * Long version
1506 */
1507 hammer_simple_transaction(&trans, ip->hmp);
1508 ++hammer_stats_file_iopsr;
1509 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1510
1511 /*
1512 * Key range (begin and end inclusive) to scan. Directory keys
1513 * directly translate to a 64 bit 'seek' position.
1514 */
1515 cursor.key_beg.localization = ip->obj_localization +
1516 HAMMER_LOCALIZE_MISC;
1517 cursor.key_beg.obj_id = ip->obj_id;
1518 cursor.key_beg.create_tid = 0;
1519 cursor.key_beg.delete_tid = 0;
1520 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1521 cursor.key_beg.obj_type = 0;
1522 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1523 cursor.asof = ip->obj_asof;
1524 cursor.flags |= HAMMER_CURSOR_ASOF;
1525
1526 error = hammer_ip_lookup(&cursor);
1527 if (error == 0) {
1528 error = hammer_ip_resolve_data(&cursor);
1529 if (error == 0) {
1530 KKASSERT(cursor.leaf->data_len >=
1531 HAMMER_SYMLINK_NAME_OFF);
1532 error = uiomove(cursor.data->symlink.name,
1533 cursor.leaf->data_len -
1534 HAMMER_SYMLINK_NAME_OFF,
1535 ap->a_uio);
1536 }
1537 }
1538 hammer_done_cursor(&cursor);
1539 hammer_done_transaction(&trans);
1540 return(error);
1541 }
1542
1543 /*
1544 * hammer_vop_nremove { nch, dvp, cred }
1545 */
1546 static
1547 int
1548 hammer_vop_nremove(struct vop_nremove_args *ap)
1549 {
1550 struct hammer_transaction trans;
1551 struct hammer_inode *dip;
1552 int error;
1553
1554 dip = VTOI(ap->a_dvp);
1555
1556 if (hammer_nohistory(dip) == 0 &&
1557 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1558 return (error);
1559 }
1560
1561 hammer_start_transaction(&trans, dip->hmp);
1562 ++hammer_stats_file_iopsw;
1563 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0);
1564 hammer_done_transaction(&trans);
1565 if (error == 0)
1566 hammer_knote(ap->a_dvp, NOTE_WRITE);
1567 return (error);
1568 }
1569
1570 /*
1571 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1572 */
1573 static
1574 int
1575 hammer_vop_nrename(struct vop_nrename_args *ap)
1576 {
1577 struct hammer_transaction trans;
1578 struct namecache *fncp;
1579 struct namecache *tncp;
1580 struct hammer_inode *fdip;
1581 struct hammer_inode *tdip;
1582 struct hammer_inode *ip;
1583 struct hammer_cursor cursor;
1584 int64_t namekey;
1585 u_int32_t max_iterations;
1586 int nlen, error;
1587
1588 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount)
1589 return(EXDEV);
1590 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
1591 return(EXDEV);
1592
1593 fdip = VTOI(ap->a_fdvp);
1594 tdip = VTOI(ap->a_tdvp);
1595 fncp = ap->a_fnch->ncp;
1596 tncp = ap->a_tnch->ncp;
1597 ip = VTOI(fncp->nc_vp);
1598 KKASSERT(ip != NULL);
1599
1600 if (fdip->obj_localization != tdip->obj_localization)
1601 return(EXDEV);
1602 if (fdip->obj_localization != ip->obj_localization)
1603 return(EXDEV);
1604
1605 if (fdip->flags & HAMMER_INODE_RO)
1606 return (EROFS);
1607 if (tdip->flags & HAMMER_INODE_RO)
1608 return (EROFS);
1609 if (ip->flags & HAMMER_INODE_RO)
1610 return (EROFS);
1611 if ((error = hammer_checkspace(fdip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1612 return (error);
1613
1614 hammer_start_transaction(&trans, fdip->hmp);
1615 ++hammer_stats_file_iopsw;
1616
1617 /*
1618 * Remove tncp from the target directory and then link ip as
1619 * tncp. XXX pass trans to dounlink
1620 *
1621 * Force the inode sync-time to match the transaction so it is
1622 * in-sync with the creation of the target directory entry.
1623 */
1624 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp,
1625 ap->a_cred, 0, -1);
1626 if (error == 0 || error == ENOENT) {
1627 error = hammer_ip_add_directory(&trans, tdip,
1628 tncp->nc_name, tncp->nc_nlen,
1629 ip);
1630 if (error == 0) {
1631 ip->ino_data.parent_obj_id = tdip->obj_id;
1632 ip->ino_data.ctime = trans.time;
1633 hammer_modify_inode(ip, HAMMER_INODE_DDIRTY);
1634 }
1635 }
1636 if (error)
1637 goto failed; /* XXX */
1638
1639 /*
1640 * Locate the record in the originating directory and remove it.
1641 *
1642 * Calculate the namekey and setup the key range for the scan. This
1643 * works kinda like a chained hash table where the lower 32 bits
1644 * of the namekey synthesize the chain.
1645 *
1646 * The key range is inclusive of both key_beg and key_end.
1647 */
1648 namekey = hammer_directory_namekey(fdip, fncp->nc_name, fncp->nc_nlen,
1649 &max_iterations);
1650 retry:
1651 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip);
1652 cursor.key_beg.localization = fdip->obj_localization +
1653 HAMMER_LOCALIZE_MISC;
1654 cursor.key_beg.obj_id = fdip->obj_id;
1655 cursor.key_beg.key = namekey;
1656 cursor.key_beg.create_tid = 0;
1657 cursor.key_beg.delete_tid = 0;
1658 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1659 cursor.key_beg.obj_type = 0;
1660
1661 cursor.key_end = cursor.key_beg;
1662 cursor.key_end.key += max_iterations;
1663 cursor.asof = fdip->obj_asof;
1664 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1665
1666 /*
1667 * Scan all matching records (the chain), locate the one matching
1668 * the requested path component.
1669 *
1670 * The hammer_ip_*() functions merge in-memory records with on-disk
1671 * records for the purposes of the search.
1672 */
1673 error = hammer_ip_first(&cursor);
1674 while (error == 0) {
1675 if (hammer_ip_resolve_data(&cursor) != 0)
1676 break;
1677 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
1678 KKASSERT(nlen > 0);
1679 if (fncp->nc_nlen == nlen &&
1680 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) {
1681 break;
1682 }
1683 error = hammer_ip_next(&cursor);
1684 }
1685
1686 /*
1687 * If all is ok we have to get the inode so we can adjust nlinks.
1688 *
1689 * WARNING: hammer_ip_del_directory() may have to terminate the
1690 * cursor to avoid a recursion. It's ok to call hammer_done_cursor()
1691 * twice.
1692 */
1693 if (error == 0)
1694 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
1695
1696 /*
1697 * XXX A deadlock here will break rename's atomicy for the purposes
1698 * of crash recovery.
1699 */
1700 if (error == EDEADLK) {
1701 hammer_done_cursor(&cursor);
1702 goto retry;
1703 }
1704
1705 /*
1706 * Cleanup and tell the kernel that the rename succeeded.
1707 */
1708 hammer_done_cursor(&cursor);
1709 if (error == 0) {
1710 cache_rename(ap->a_fnch, ap->a_tnch);
1711 hammer_knote(ap->a_fdvp, NOTE_WRITE);
1712 hammer_knote(ap->a_tdvp, NOTE_WRITE);
1713 if (ip->vp)
1714 hammer_knote(ip->vp, NOTE_RENAME);
1715 }
1716
1717 failed:
1718 hammer_done_transaction(&trans);
1719 return (error);
1720 }
1721
1722 /*
1723 * hammer_vop_nrmdir { nch, dvp, cred }
1724 */
1725 static
1726 int
1727 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
1728 {
1729 struct hammer_transaction trans;
1730 struct hammer_inode *dip;
1731 int error;
1732
1733 dip = VTOI(ap->a_dvp);
1734
1735 if (hammer_nohistory(dip) == 0 &&
1736 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1737 return (error);
1738 }
1739
1740 hammer_start_transaction(&trans, dip->hmp);
1741 ++hammer_stats_file_iopsw;
1742 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1);
1743 hammer_done_transaction(&trans);
1744 if (error == 0)
1745 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1746 return (error);
1747 }
1748
1749 /*
1750 * hammer_vop_markatime { vp, cred }
1751 */
1752 static
1753 int
1754 hammer_vop_markatime(struct vop_markatime_args *ap)
1755 {
1756 struct hammer_transaction trans;
1757 struct hammer_inode *ip;
1758
1759 ip = VTOI(ap->a_vp);
1760 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1761 return (EROFS);
1762 if (ip->flags & HAMMER_INODE_RO)
1763 return (EROFS);
1764 if (ip->hmp->mp->mnt_flag & MNT_NOATIME)
1765 return (0);
1766 hammer_start_transaction(&trans, ip->hmp);
1767 ++hammer_stats_file_iopsw;
1768
1769 ip->ino_data.atime = trans.time;
1770 hammer_modify_inode(ip, HAMMER_INODE_ATIME);
1771 hammer_done_transaction(&trans);
1772 hammer_knote(ap->a_vp, NOTE_ATTRIB);
1773 return (0);
1774 }
1775
1776 /*
1777 * hammer_vop_setattr { vp, vap, cred }
1778 */
1779 static
1780 int
1781 hammer_vop_setattr(struct vop_setattr_args *ap)
1782 {
1783 struct hammer_transaction trans;
1784 struct vattr *vap;
1785 struct hammer_inode *ip;
1786 int modflags;
1787 int error;
1788 int truncating;
1789 int blksize;
1790 int kflags;
1791 int64_t aligned_size;
1792 u_int32_t flags;
1793
1794 vap = ap->a_vap;
1795 ip = ap->a_vp->v_data;
1796 modflags = 0;
1797 kflags = 0;
1798
1799 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1800 return(EROFS);
1801 if (ip->flags & HAMMER_INODE_RO)
1802 return (EROFS);
1803 if (hammer_nohistory(ip) == 0 &&
1804 (error = hammer_checkspace(ip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1805 return (error);
1806 }
1807
1808 hammer_start_transaction(&trans, ip->hmp);
1809 ++hammer_stats_file_iopsw;
1810 error = 0;
1811
1812 if (vap->va_flags != VNOVAL) {
1813 flags = ip->ino_data.uflags;
1814 error = vop_helper_setattr_flags(&flags, vap->va_flags,
1815 hammer_to_unix_xid(&ip->ino_data.uid),
1816 ap->a_cred);
1817 if (error == 0) {
1818 if (ip->ino_data.uflags != flags) {
1819 ip->ino_data.uflags = flags;
1820 ip->ino_data.ctime = trans.time;
1821 modflags |= HAMMER_INODE_DDIRTY;
1822 kflags |= NOTE_ATTRIB;
1823 }
1824 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1825 error = 0;
1826 goto done;
1827 }
1828 }
1829 goto done;
1830 }
1831 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1832 error = EPERM;
1833 goto done;
1834 }
1835 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
1836 mode_t cur_mode = ip->ino_data.mode;
1837 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
1838 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1839 uuid_t uuid_uid;
1840 uuid_t uuid_gid;
1841
1842 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
1843 ap->a_cred,
1844 &cur_uid, &cur_gid, &cur_mode);
1845 if (error == 0) {
1846 hammer_guid_to_uuid(&uuid_uid, cur_uid);
1847 hammer_guid_to_uuid(&uuid_gid, cur_gid);
1848 if (bcmp(&uuid_uid, &ip->ino_data.uid,
1849 sizeof(uuid_uid)) ||
1850 bcmp(&uuid_gid, &ip->ino_data.gid,
1851 sizeof(uuid_gid)) ||
1852 ip->ino_data.mode != cur_mode
1853 ) {
1854 ip->ino_data.uid = uuid_uid;
1855 ip->ino_data.gid = uuid_gid;
1856 ip->ino_data.mode = cur_mode;
1857 ip->ino_data.ctime = trans.time;
1858 modflags |= HAMMER_INODE_DDIRTY;
1859 }
1860 kflags |= NOTE_ATTRIB;
1861 }
1862 }
1863 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) {
1864 switch(ap->a_vp->v_type) {
1865 case VREG:
1866 if (vap->va_size == ip->ino_data.size)
1867 break;
1868 /*
1869 * XXX break atomicy, we can deadlock the backend
1870 * if we do not release the lock. Probably not a
1871 * big deal here.
1872 */
1873 blksize = hammer_blocksize(vap->va_size);
1874 if (vap->va_size < ip->ino_data.size) {
1875 vtruncbuf(ap->a_vp, vap->va_size, blksize);
1876 truncating = 1;
1877 kflags |= NOTE_WRITE;
1878 } else {
1879 vnode_pager_setsize(ap->a_vp, vap->va_size);
1880 truncating = 0;
1881 kflags |= NOTE_WRITE | NOTE_EXTEND;
1882 }
1883 ip->ino_data.size = vap->va_size;
1884 ip->ino_data.mtime = trans.time;
1885 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY;
1886
1887 /*
1888 * on-media truncation is cached in the inode until
1889 * the inode is synchronized.
1890 */
1891 if (truncating) {
1892 hammer_ip_frontend_trunc(ip, vap->va_size);
1893 #ifdef DEBUG_TRUNCATE
1894 if (HammerTruncIp == NULL)
1895 HammerTruncIp = ip;
1896 #endif
1897 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
1898 ip->flags |= HAMMER_INODE_TRUNCATED;
1899 ip->trunc_off = vap->va_size;
1900 #ifdef DEBUG_TRUNCATE
1901 if (ip == HammerTruncIp)
1902 kprintf("truncate1 %016llx\n",
1903 (long long)ip->trunc_off);
1904 #endif
1905 } else if (ip->trunc_off > vap->va_size) {
1906 ip->trunc_off = vap->va_size;
1907 #ifdef DEBUG_TRUNCATE
1908 if (ip == HammerTruncIp)
1909 kprintf("truncate2 %016llx\n",
1910 (long long)ip->trunc_off);
1911 #endif
1912 } else {
1913 #ifdef DEBUG_TRUNCATE
1914 if (ip == HammerTruncIp)
1915 kprintf("truncate3 %016llx (ignored)\n",
1916 (long long)vap->va_size);
1917 #endif
1918 }
1919 }
1920
1921 /*
1922 * If truncating we have to clean out a portion of
1923 * the last block on-disk. We do this in the
1924 * front-end buffer cache.
1925 */
1926 aligned_size = (vap->va_size + (blksize - 1)) &
1927 ~(int64_t)(blksize - 1);
1928 if (truncating && vap->va_size < aligned_size) {
1929 struct buf *bp;
1930 int offset;
1931
1932 aligned_size -= blksize;
1933
1934 offset = (int)vap->va_size & (blksize - 1);
1935 error = bread(ap->a_vp, aligned_size,
1936 blksize, &bp);
1937 hammer_ip_frontend_trunc(ip, aligned_size);
1938 if (error == 0) {
1939 bzero(bp->b_data + offset,
1940 blksize - offset);
1941 /* must de-cache direct-io offset */
1942 bp->b_bio2.bio_offset = NOOFFSET;
1943 bdwrite(bp);
1944 } else {
1945 kprintf("ERROR %d\n", error);
1946 brelse(bp);
1947 }
1948 }
1949 break;
1950 case VDATABASE:
1951 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
1952 ip->flags |= HAMMER_INODE_TRUNCATED;
1953 ip->trunc_off = vap->va_size;
1954 } else if (ip->trunc_off > vap->va_size) {
1955 ip->trunc_off = vap->va_size;
1956 }
1957 hammer_ip_frontend_trunc(ip, vap->va_size);
1958 ip->ino_data.size = vap->va_size;
1959 ip->ino_data.mtime = trans.time;
1960 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY;
1961 kflags |= NOTE_ATTRIB;
1962 break;
1963 default:
1964 error = EINVAL;
1965 goto done;
1966 }
1967 break;
1968 }
1969 if (vap->va_atime.tv_sec != VNOVAL) {
1970 ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime);
1971 modflags |= HAMMER_INODE_ATIME;
1972 kflags |= NOTE_ATTRIB;
1973 }
1974 if (vap->va_mtime.tv_sec != VNOVAL) {
1975 ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime);
1976 modflags |= HAMMER_INODE_MTIME;
1977 kflags |= NOTE_ATTRIB;
1978 }
1979 if (vap->va_mode != (mode_t)VNOVAL) {
1980 mode_t cur_mode = ip->ino_data.mode;
1981 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
1982 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1983
1984 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
1985 cur_uid, cur_gid, &cur_mode);
1986 if (error == 0 && ip->ino_data.mode != cur_mode) {
1987 ip->ino_data.mode = cur_mode;
1988 ip->ino_data.ctime = trans.time;
1989 modflags |= HAMMER_INODE_DDIRTY;
1990 kflags |= NOTE_ATTRIB;
1991 }
1992 }
1993 done:
1994 if (error == 0)
1995 hammer_modify_inode(ip, modflags);
1996 hammer_done_transaction(&trans);
1997 hammer_knote(ap->a_vp, kflags);
1998 return (error);
1999 }
2000
2001 /*
2002 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
2003 */
2004 static
2005 int
2006 hammer_vop_nsymlink(struct vop_nsymlink_args *ap)
2007 {
2008 struct hammer_transaction trans;
2009 struct hammer_inode *dip;
2010 struct hammer_inode *nip;
2011 struct nchandle *nch;
2012 hammer_record_t record;
2013 int error;
2014 int bytes;
2015
2016 ap->a_vap->va_type = VLNK;
2017
2018 nch = ap->a_nch;
2019 dip = VTOI(ap->a_dvp);
2020
2021 if (dip->flags & HAMMER_INODE_RO)
2022 return (EROFS);
2023 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
2024 return (error);
2025
2026 /*
2027 * Create a transaction to cover the operations we perform.
2028 */
2029 hammer_start_transaction(&trans, dip->hmp);
2030 ++hammer_stats_file_iopsw;
2031
2032 /*
2033 * Create a new filesystem object of the requested type. The
2034 * returned inode will be referenced but not locked.
2035 */
2036
2037 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
2038 dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
2039 NULL, &nip);
2040 if (error) {
2041 hammer_done_transaction(&trans);
2042 *ap->a_vpp = NULL;
2043 return (error);
2044 }
2045
2046 /*
2047 * Add a record representing the symlink. symlink stores the link
2048 * as pure data, not a string, and is no \0 terminated.
2049 */
2050 if (error == 0) {
2051 bytes = strlen(ap->a_target);
2052
2053 if (bytes <= HAMMER_INODE_BASESYMLEN) {
2054 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes);
2055 } else {
2056 record = hammer_alloc_mem_record(nip, bytes);
2057 record->type = HAMMER_MEM_RECORD_GENERAL;
2058
2059 record->leaf.base.localization = nip->obj_localization +
2060 HAMMER_LOCALIZE_MISC;
2061 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK;
2062 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX;
2063 record->leaf.data_len = bytes;
2064 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0);
2065 bcopy(ap->a_target, record->data->symlink.name, bytes);
2066 error = hammer_ip_add_record(&trans, record);
2067 }
2068
2069 /*
2070 * Set the file size to the length of the link.
2071 */
2072 if (error == 0) {
2073 nip->ino_data.size = bytes;
2074 hammer_modify_inode(nip, HAMMER_INODE_DDIRTY);
2075 }
2076 }
2077 if (error == 0)
2078 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name,
2079 nch->ncp->nc_nlen, nip);
2080
2081 /*
2082 * Finish up.
2083 */
2084 if (error) {
2085 hammer_rel_inode(nip, 0);
2086 *ap->a_vpp = NULL;
2087 } else {
2088 error = hammer_get_vnode(nip, ap->a_vpp);
2089 hammer_rel_inode(nip, 0);
2090 if (error == 0) {
2091 cache_setunresolved(ap->a_nch);
2092 cache_setvp(ap->a_nch, *ap->a_vpp);
2093 hammer_knote(ap->a_dvp, NOTE_WRITE);
2094 }
2095 }
2096 hammer_done_transaction(&trans);
2097 return (error);
2098 }
2099
2100 /*
2101 * hammer_vop_nwhiteout { nch, dvp, cred, flags }
2102 */
2103 static
2104 int
2105 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap)
2106 {
2107 struct hammer_transaction trans;
2108 struct hammer_inode *dip;
2109 int error;
2110
2111 dip = VTOI(ap->a_dvp);
2112
2113 if (hammer_nohistory(dip) == 0 &&
2114 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) {
2115 return (error);
2116 }
2117
2118 hammer_start_transaction(&trans, dip->hmp);
2119 ++hammer_stats_file_iopsw;
2120 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp,
2121 ap->a_cred, ap->a_flags, -1);
2122 hammer_done_transaction(&trans);
2123
2124 return (error);
2125 }
2126
2127 /*
2128 * hammer_vop_ioctl { vp, command, data, fflag, cred }
2129 */
2130 static
2131 int
2132 hammer_vop_ioctl(struct vop_ioctl_args *ap)
2133 {
2134 struct hammer_inode *ip = ap->a_vp->v_data;
2135
2136 ++hammer_stats_file_iopsr;
2137 return(hammer_ioctl(ip, ap->a_command, ap->a_data,
2138 ap->a_fflag, ap->a_cred));
2139 }
2140
2141 static
2142 int
2143 hammer_vop_mountctl(struct vop_mountctl_args *ap)
2144 {
2145 struct mount *mp;
2146 int error;
2147
2148 mp = ap->a_head.a_ops->head.vv_mount;
2149
2150 switch(ap->a_op) {
2151 case MOUNTCTL_SET_EXPORT:
2152 if (ap->a_ctllen != sizeof(struct export_args))
2153 error = EINVAL;
2154 else
2155 error = hammer_vfs_export(mp, ap->a_op,
2156 (const struct export_args *)ap->a_ctl);
2157 break;
2158 default:
2159 error = journal_mountctl(ap);
2160 break;
2161 }
2162 return(error);
2163 }
2164
2165 /*
2166 * hammer_vop_strategy { vp, bio }
2167 *
2168 * Strategy call, used for regular file read & write only. Note that the
2169 * bp may represent a cluster.
2170 *
2171 * To simplify operation and allow better optimizations in the future,
2172 * this code does not make any assumptions with regards to buffer alignment
2173 * or size.
2174 */
2175 static
2176 int
2177 hammer_vop_strategy(struct vop_strategy_args *ap)
2178 {
2179 struct buf *bp;
2180 int error;
2181
2182 bp = ap->a_bio->bio_buf;
2183
2184 switch(bp->b_cmd) {
2185 case BUF_CMD_READ:
2186 error = hammer_vop_strategy_read(ap);
2187 break;
2188 case BUF_CMD_WRITE:
2189 error = hammer_vop_strategy_write(ap);
2190 break;
2191 default:
2192 bp->b_error = error = EINVAL;
2193 bp->b_flags |= B_ERROR;
2194 biodone(ap->a_bio);
2195 break;
2196 }
2197 return (error);
2198 }
2199
2200 /*
2201 * Read from a regular file. Iterate the related records and fill in the
2202 * BIO/BUF. Gaps are zero-filled.
2203 *
2204 * The support code in hammer_object.c should be used to deal with mixed
2205 * in-memory and on-disk records.
2206 *
2207 * NOTE: Can be called from the cluster code with an oversized buf.
2208 *
2209 * XXX atime update
2210 */
2211 static
2212 int
2213 hammer_vop_strategy_read(struct vop_strategy_args *ap)
2214 {
2215 struct hammer_transaction trans;
2216 struct hammer_inode *ip;
2217 struct hammer_inode *dip;
2218 struct hammer_cursor cursor;
2219 hammer_base_elm_t base;
2220 hammer_off_t disk_offset;
2221 struct bio *bio;
2222 struct bio *nbio;
2223 struct buf *bp;
2224 int64_t rec_offset;
2225 int64_t ran_end;
2226 int64_t tmp64;
2227 int error;
2228 int boff;
2229 int roff;
2230 int n;
2231
2232 bio = ap->a_bio;
2233 bp = bio->bio_buf;
2234 ip = ap->a_vp->v_data;
2235
2236 /*
2237 * The zone-2 disk offset may have been set by the cluster code via
2238 * a BMAP operation, or else should be NOOFFSET.
2239 *
2240 * Checking the high bits for a match against zone-2 should suffice.
2241 */
2242 nbio = push_bio(bio);
2243 if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) ==
2244 HAMMER_ZONE_LARGE_DATA) {
2245 error = hammer_io_direct_read(ip->hmp, nbio, NULL);
2246 return (error);
2247 }
2248
2249 /*
2250 * Well, that sucked. Do it the hard way. If all the stars are
2251 * aligned we may still be able to issue a direct-read.
2252 */
2253 hammer_simple_transaction(&trans, ip->hmp);
2254 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2255
2256 /*
2257 * Key range (begin and end inclusive) to scan. Note that the key's
2258 * stored in the actual records represent BASE+LEN, not BASE. The
2259 * first record containing bio_offset will have a key > bio_offset.
2260 */
2261 cursor.key_beg.localization = ip->obj_localization +
2262 HAMMER_LOCALIZE_MISC;
2263 cursor.key_beg.obj_id = ip->obj_id;
2264 cursor.key_beg.create_tid = 0;
2265 cursor.key_beg.delete_tid = 0;
2266 cursor.key_beg.obj_type = 0;
2267 cursor.key_beg.key = bio->bio_offset + 1;
2268 cursor.asof = ip->obj_asof;
2269 cursor.flags |= HAMMER_CURSOR_ASOF;
2270
2271 cursor.key_end = cursor.key_beg;
2272 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2273 #if 0
2274 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) {
2275 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
2276 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
2277 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2278 } else
2279 #endif
2280 {
2281 ran_end = bio->bio_offset + bp->b_bufsize;
2282 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2283 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2284 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2285 if (tmp64 < ran_end)
2286 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2287 else
2288 cursor.key_end.key = ran_end + MAXPHYS + 1;
2289 }
2290 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2291
2292 error = hammer_ip_first(&cursor);
2293 boff = 0;
2294
2295 while (error == 0) {
2296 /*
2297 * Get the base file offset of the record. The key for
2298 * data records is (base + bytes) rather then (base).
2299 */
2300 base = &cursor.leaf->base;
2301 rec_offset = base->key - cursor.leaf->data_len;
2302
2303 /*
2304 * Calculate the gap, if any, and zero-fill it.
2305 *
2306 * n is the offset of the start of the record verses our
2307 * current seek offset in the bio.
2308 */
2309 n = (int)(rec_offset - (bio->bio_offset + boff));
2310 if (n > 0) {
2311 if (n > bp->b_bufsize - boff)
2312 n = bp->b_bufsize - boff;
2313 bzero((char *)bp->b_data + boff, n);
2314 boff += n;
2315 n = 0;
2316 }
2317
2318 /*
2319 * Calculate the data offset in the record and the number
2320 * of bytes we can copy.
2321 *
2322 * There are two degenerate cases. First, boff may already
2323 * be at bp->b_bufsize. Secondly, the data offset within
2324 * the record may exceed the record's size.
2325 */
2326 roff = -n;
2327 rec_offset += roff;
2328 n = cursor.leaf->data_len - roff;
2329 if (n <= 0) {
2330 kprintf("strategy_read: bad n=%d roff=%d\n", n, roff);
2331 n = 0;
2332 } else if (n > bp->b_bufsize - boff) {
2333 n = bp->b_bufsize - boff;
2334 }
2335
2336 /*
2337 * Deal with cached truncations. This cool bit of code
2338 * allows truncate()/ftruncate() to avoid having to sync
2339 * the file.
2340 *
2341 * If the frontend is truncated then all backend records are
2342 * subject to the frontend's truncation.
2343 *
2344 * If the backend is truncated then backend records on-disk
2345 * (but not in-memory) are subject to the backend's
2346 * truncation. In-memory records owned by the backend
2347 * represent data written after the truncation point on the
2348 * backend and must not be truncated.
2349 *
2350 * Truncate operations deal with frontend buffer cache
2351 * buffers and frontend-owned in-memory records synchronously.
2352 */
2353 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2354 if (hammer_cursor_ondisk(&cursor) ||
2355 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2356 if (ip->trunc_off <= rec_offset)
2357 n = 0;
2358 else if (ip->trunc_off < rec_offset + n)
2359 n = (int)(ip->trunc_off - rec_offset);
2360 }
2361 }
2362 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2363 if (hammer_cursor_ondisk(&cursor)) {
2364 if (ip->sync_trunc_off <= rec_offset)
2365 n = 0;
2366 else if (ip->sync_trunc_off < rec_offset + n)
2367 n = (int)(ip->sync_trunc_off - rec_offset);
2368 }
2369 }
2370
2371 /*
2372 * Try to issue a direct read into our bio if possible,
2373 * otherwise resolve the element data into a hammer_buffer
2374 * and copy.
2375 *
2376 * The buffer on-disk should be zerod past any real
2377 * truncation point, but may not be for any synthesized
2378 * truncation point from above.
2379 */
2380 disk_offset = cursor.leaf->data_offset + roff;
2381 if (boff == 0 && n == bp->b_bufsize &&
2382 hammer_cursor_ondisk(&cursor) &&
2383 (disk_offset & HAMMER_BUFMASK) == 0) {
2384 KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) ==
2385 HAMMER_ZONE_LARGE_DATA);
2386 nbio->bio_offset = disk_offset;
2387 error = hammer_io_direct_read(trans.hmp, nbio,
2388 cursor.leaf);
2389 goto done;
2390 } else if (n) {
2391 error = hammer_ip_resolve_data(&cursor);
2392 if (error == 0) {
2393 bcopy((char *)cursor.data + roff,
2394 (char *)bp->b_data + boff, n);
2395 }
2396 }
2397 if (error)
2398 break;
2399
2400 /*
2401 * Iterate until we have filled the request.
2402 */
2403 boff += n;
2404 if (boff == bp->b_bufsize)
2405 break;
2406 error = hammer_ip_next(&cursor);
2407 }
2408
2409 /*
2410 * There may have been a gap after the last record
2411 */
2412 if (error == ENOENT)
2413 error = 0;
2414 if (error == 0 && boff != bp->b_bufsize) {
2415 KKASSERT(boff < bp->b_bufsize);
2416 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
2417 /* boff = bp->b_bufsize; */
2418 }
2419 bp->b_resid = 0;
2420 bp->b_error = error;
2421 if (error)
2422 bp->b_flags |= B_ERROR;
2423 biodone(ap->a_bio);
2424
2425 done:
2426 /*
2427 * Cache the b-tree node for the last data read in cache[1].
2428 *
2429 * If we hit the file EOF then also cache the node in the
2430 * governing director's cache[3], it will be used to initialize
2431 * the inode's cache[1] for any inodes looked up via the directory.
2432 *
2433 * This doesn't reduce disk accesses since the B-Tree chain is
2434 * likely cached, but it does reduce cpu overhead when looking
2435 * up file offsets for cpdup/tar/cpio style iterations.
2436 */
2437 if (cursor.node)
2438 hammer_cache_node(&ip->cache[1], cursor.node);
2439 if (ran_end >= ip->ino_data.size) {
2440 dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id,
2441 ip->obj_asof, ip->obj_localization);
2442 if (dip) {
2443 hammer_cache_node(&dip->cache[3], cursor.node);
2444 hammer_rel_inode(dip, 0);
2445 }
2446 }
2447 hammer_done_cursor(&cursor);
2448 hammer_done_transaction(&trans);
2449 return(error);
2450 }
2451
2452 /*
2453 * BMAP operation - used to support cluster_read() only.
2454 *
2455 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb)
2456 *
2457 * This routine may return EOPNOTSUPP if the opration is not supported for
2458 * the specified offset. The contents of the pointer arguments do not
2459 * need to be initialized in that case.
2460 *
2461 * If a disk address is available and properly aligned return 0 with
2462 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately
2463 * to the run-length relative to that offset. Callers may assume that
2464 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently
2465 * large, so return EOPNOTSUPP if it is not sufficiently large.
2466 */
2467 static
2468 int
2469 hammer_vop_bmap(struct vop_bmap_args *ap)
2470 {
2471 struct hammer_transaction trans;
2472 struct hammer_inode *ip;
2473 struct hammer_cursor cursor;
2474 hammer_base_elm_t base;
2475 int64_t rec_offset;
2476 int64_t ran_end;
2477 int64_t tmp64;
2478 int64_t base_offset;
2479 int64_t base_disk_offset;
2480 int64_t last_offset;
2481 hammer_off_t last_disk_offset;
2482 hammer_off_t disk_offset;
2483 int rec_len;
2484 int error;
2485 int blksize;
2486
2487 ++hammer_stats_file_iopsr;
2488 ip = ap->a_vp->v_data;
2489
2490 /*
2491 * We can only BMAP regular files. We can't BMAP database files,
2492 * directories, etc.
2493 */
2494 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE)
2495 return(EOPNOTSUPP);
2496
2497 /*
2498 * bmap is typically called with runp/runb both NULL when used
2499 * for writing. We do not support BMAP for writing atm.
2500 */
2501 if (ap->a_cmd != BUF_CMD_READ)
2502 return(EOPNOTSUPP);
2503
2504 /*
2505 * Scan the B-Tree to acquire blockmap addresses, then translate
2506 * to raw addresses.
2507 */
2508 hammer_simple_transaction(&trans, ip->hmp);
2509 #if 0
2510 kprintf("bmap_beg %016llx ip->cache %p\n",
2511 (long long)ap->a_loffset, ip->cache[1]);
2512 #endif
2513 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2514
2515 /*
2516 * Key range (begin and end inclusive) to scan. Note that the key's
2517 * stored in the actual records represent BASE+LEN, not BASE. The
2518 * first record containing bio_offset will have a key > bio_offset.
2519 */
2520 cursor.key_beg.localization = ip->obj_localization +
2521 HAMMER_LOCALIZE_MISC;
2522 cursor.key_beg.obj_id = ip->obj_id;
2523 cursor.key_beg.create_tid = 0;
2524 cursor.key_beg.delete_tid = 0;
2525 cursor.key_beg.obj_type = 0;
2526 if (ap->a_runb)
2527 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1;
2528 else
2529 cursor.key_beg.key = ap->a_loffset + 1;
2530 if (cursor.key_beg.key < 0)
2531 cursor.key_beg.key = 0;
2532 cursor.asof = ip->obj_asof;
2533 cursor.flags |= HAMMER_CURSOR_ASOF;
2534
2535 cursor.key_end = cursor.key_beg;
2536 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2537
2538 ran_end = ap->a_loffset + MAXPHYS;
2539 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2540 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2541 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2542 if (tmp64 < ran_end)
2543 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2544 else
2545 cursor.key_end.key = ran_end + MAXPHYS + 1;
2546
2547 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2548
2549 error = hammer_ip_first(&cursor);
2550 base_offset = last_offset = 0;
2551 base_disk_offset = last_disk_offset = 0;
2552
2553 while (error == 0) {
2554 /*
2555 * Get the base file offset of the record. The key for
2556 * data records is (base + bytes) rather then (base).
2557 *
2558 * NOTE: rec_offset + rec_len may exceed the end-of-file.
2559 * The extra bytes should be zero on-disk and the BMAP op
2560 * should still be ok.
2561 */
2562 base = &cursor.leaf->base;
2563 rec_offset = base->key - cursor.leaf->data_len;
2564 rec_len = cursor.leaf->data_len;
2565
2566 /*
2567 * Incorporate any cached truncation.
2568 *
2569 * NOTE: Modifications to rec_len based on synthesized
2570 * truncation points remove the guarantee that any extended
2571 * data on disk is zero (since the truncations may not have
2572 * taken place on-media yet).
2573 */
2574 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2575 if (hammer_cursor_ondisk(&cursor) ||
2576 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2577 if (ip->trunc_off <= rec_offset)
2578 rec_len = 0;
2579 else if (ip->trunc_off < rec_offset + rec_len)
2580 rec_len = (int)(ip->trunc_off - rec_offset);
2581 }
2582 }
2583 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2584 if (hammer_cursor_ondisk(&cursor)) {
2585 if (ip->sync_trunc_off <= rec_offset)
2586 rec_len = 0;
2587 else if (ip->sync_trunc_off < rec_offset + rec_len)
2588 rec_len = (int)(ip->sync_trunc_off - rec_offset);
2589 }
2590 }
2591
2592 /*
2593 * Accumulate information. If we have hit a discontiguous
2594 * block reset base_offset unless we are already beyond the
2595 * requested offset. If we are, that's it, we stop.
2596 */
2597 if (error)
2598 break;
2599 if (hammer_cursor_ondisk(&cursor)) {
2600 disk_offset = cursor.leaf->data_offset;
2601 if (rec_offset != last_offset ||
2602 disk_offset != last_disk_offset) {
2603 if (rec_offset > ap->a_loffset)
2604 break;
2605 base_offset = rec_offset;
2606 base_disk_offset = disk_offset;
2607 }
2608 last_offset = rec_offset + rec_len;
2609 last_disk_offset = disk_offset + rec_len;
2610 }
2611 error = hammer_ip_next(&cursor);
2612 }
2613
2614 #if 0
2615 kprintf("BMAP %016llx: %016llx - %016llx\n",
2616 (long long)ap->a_loffset,
2617 (long long)base_offset,
2618 (long long)last_offset);
2619 kprintf("BMAP %16s: %016llx - %016llx\n", "",
2620 (long long)base_disk_offset,
2621 (long long)last_disk_offset);
2622 #endif
2623
2624 if (cursor.node) {
2625 hammer_cache_node(&ip->cache[1], cursor.node);
2626 #if 0
2627 kprintf("bmap_end2 %016llx ip->cache %p\n",
2628 (long long)ap->a_loffset, ip->cache[1]);
2629 #endif
2630 }
2631 hammer_done_cursor(&cursor);
2632 hammer_done_transaction(&trans);
2633
2634 /*
2635 * If we couldn't find any records or the records we did find were
2636 * all behind the requested offset, return failure. A forward
2637 * truncation can leave a hole w/ no on-disk records.
2638 */
2639 if (last_offset == 0 || last_offset < ap->a_loffset)
2640 return (EOPNOTSUPP);
2641
2642 /*
2643 * Figure out the block size at the requested offset and adjust
2644 * our limits so the cluster_read() does not create inappropriately
2645 * sized buffer cache buffers.
2646 */
2647 blksize = hammer_blocksize(ap->a_loffset);
2648 if (hammer_blocksize(base_offset) != blksize) {
2649 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset);
2650 }
2651 if (last_offset != ap->a_loffset &&
2652 hammer_blocksize(last_offset - 1) != blksize) {
2653 last_offset = hammer_blockdemarc(ap->a_loffset,
2654 last_offset - 1);
2655 }
2656
2657 /*
2658 * Returning EOPNOTSUPP simply prevents the direct-IO optimization
2659 * from occuring.
2660 */
2661 disk_offset = base_disk_offset + (ap->a_loffset - base_offset);
2662
2663 if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) {
2664 /*
2665 * Only large-data zones can be direct-IOd
2666 */
2667 error = EOPNOTSUPP;
2668 } else if ((disk_offset & HAMMER_BUFMASK) ||
2669 (last_offset - ap->a_loffset) < blksize) {
2670 /*
2671 * doffsetp is not aligned or the forward run size does
2672 * not cover a whole buffer, disallow the direct I/O.
2673 */
2674 error = EOPNOTSUPP;
2675 } else {
2676 /*
2677 * We're good.
2678 */
2679 *ap->a_doffsetp = disk_offset;
2680 if (ap->a_runb) {
2681 *ap->a_runb = ap->a_loffset - base_offset;
2682 KKASSERT(*ap->a_runb >= 0);
2683 }
2684 if (ap->a_runp) {
2685 *ap->a_runp = last_offset - ap->a_loffset;
2686 KKASSERT(*ap->a_runp >= 0);
2687 }
2688 error = 0;
2689 }
2690 return(error);
2691 }
2692
2693 /*
2694 * Write to a regular file. Because this is a strategy call the OS is
2695 * trying to actually get data onto the media.
2696 */
2697 static
2698 int
2699 hammer_vop_strategy_write(struct vop_strategy_args *ap)
2700 {
2701 hammer_record_t record;
2702 hammer_mount_t hmp;
2703 hammer_inode_t ip;
2704 struct bio *bio;
2705 struct buf *bp;
2706 int blksize;
2707 int bytes;
2708 int error;
2709
2710 bio = ap->a_bio;
2711 bp = bio->bio_buf;
2712 ip = ap->a_vp->v_data;
2713 hmp = ip->hmp;
2714
2715 blksize = hammer_blocksize(bio->bio_offset);
2716 KKASSERT(bp->b_bufsize == blksize);
2717
2718 if (ip->flags & HAMMER_INODE_RO) {
2719 bp->b_error = EROFS;
2720 bp->b_flags |= B_ERROR;
2721 biodone(ap->a_bio);
2722 return(EROFS);
2723 }
2724
2725 /*
2726 * Interlock with inode destruction (no in-kernel or directory
2727 * topology visibility). If we queue new IO while trying to
2728 * destroy the inode we can deadlock the vtrunc call in
2729 * hammer_inode_unloadable_check().
2730 *
2731 * Besides, there's no point flushing a bp associated with an
2732 * inode that is being destroyed on-media and has no kernel
2733 * references.
2734 */
2735 if ((ip->flags | ip->sync_flags) &
2736 (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) {
2737 bp->b_resid = 0;
2738 biodone(ap->a_bio);
2739 return(0);
2740 }
2741
2742 /*
2743 * Reserve space and issue a direct-write from the front-end.
2744 * NOTE: The direct_io code will hammer_bread/bcopy smaller
2745 * allocations.
2746 *
2747 * An in-memory record will be installed to reference the storage
2748 * until the flusher can get to it.
2749 *
2750 * Since we own the high level bio the front-end will not try to
2751 * do a direct-read until the write completes.
2752 *
2753 * NOTE: The only time we do not reserve a full-sized buffers
2754 * worth of data is if the file is small. We do not try to
2755 * allocate a fragment (from the small-data zone) at the end of
2756 * an otherwise large file as this can lead to wildly separated
2757 * data.
2758 */
2759 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0);
2760 KKASSERT(bio->bio_offset < ip->ino_data.size);
2761 if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2)
2762 bytes = bp->b_bufsize;
2763 else
2764 bytes = ((int)ip->ino_data.size + 15) & ~15;
2765
2766 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data,
2767 bytes, &error);
2768 if (record) {
2769 hammer_io_direct_write(hmp, record, bio);
2770 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs)
2771 hammer_flush_inode(ip, 0);
2772 } else {
2773 bp->b_bio2.bio_offset = NOOFFSET;
2774 bp->b_error = error;
2775 bp->b_flags |= B_ERROR;
2776 biodone(ap->a_bio);
2777 }
2778 return(error);
2779 }
2780
2781 /*
2782 * dounlink - disconnect a directory entry
2783 *
2784 * XXX whiteout support not really in yet
2785 */
2786 static int
2787 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
2788 struct vnode *dvp, struct ucred *cred,
2789 int flags, int isdir)
2790 {
2791 struct namecache *ncp;
2792 hammer_inode_t dip;
2793 hammer_inode_t ip;
2794 struct hammer_cursor cursor;
2795 int64_t namekey;
2796 u_int32_t max_iterations;
2797 int nlen, error;
2798
2799 /*
2800 * Calculate the namekey and setup the key range for the scan. This
2801 * works kinda like a chained hash table where the lower 32 bits
2802 * of the namekey synthesize the chain.
2803 *
2804 * The key range is inclusive of both key_beg and key_end.
2805 */
2806 dip = VTOI(dvp);
2807 ncp = nch->ncp;
2808
2809 if (dip->flags & HAMMER_INODE_RO)
2810 return (EROFS);
2811
2812 namekey = hammer_directory_namekey(dip, ncp->nc_name, ncp->nc_nlen,
2813 &max_iterations);
2814 retry:
2815 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip);
2816 cursor.key_beg.localization = dip->obj_localization +
2817 HAMMER_LOCALIZE_MISC;
2818 cursor.key_beg.obj_id = dip->obj_id;
2819 cursor.key_beg.key = namekey;
2820 cursor.key_beg.create_tid = 0;
2821 cursor.key_beg.delete_tid = 0;
2822 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
2823 cursor.key_beg.obj_type = 0;
2824
2825 cursor.key_end = cursor.key_beg;
2826 cursor.key_end.key += max_iterations;
2827 cursor.asof = dip->obj_asof;
2828 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
2829
2830 /*
2831 * Scan all matching records (the chain), locate the one matching
2832 * the requested path component. info->last_error contains the
2833 * error code on search termination and could be 0, ENOENT, or
2834 * something else.
2835 *
2836 * The hammer_ip_*() functions merge in-memory records with on-disk
2837 * records for the purposes of the search.
2838 */
2839 error = hammer_ip_first(&cursor);
2840
2841 while (error == 0) {
2842 error = hammer_ip_resolve_data(&cursor);
2843 if (error)
2844 break;
2845 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
2846 KKASSERT(nlen > 0);
2847 if (ncp->nc_nlen == nlen &&
2848 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
2849 break;
2850 }
2851 error = hammer_ip_next(&cursor);
2852 }
2853
2854 /*
2855 * If all is ok we have to get the inode so we can adjust nlinks.
2856 * To avoid a deadlock with the flusher we must release the inode
2857 * lock on the directory when acquiring the inode for the entry.
2858 *
2859 * If the target is a directory, it must be empty.
2860 */
2861 if (error == 0) {
2862 hammer_unlock(&cursor.ip->lock);
2863 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id,
2864 dip->hmp->asof,
2865 cursor.data->entry.localization,
2866 0, &error);
2867 hammer_lock_sh(&cursor.ip->lock);
2868 if (error == ENOENT) {
2869 kprintf("HAMMER: WARNING: Removing "
2870 "dirent w/missing inode \"%s\"\n"
2871 "\tobj_id = %016llx\n",
2872 ncp->nc_name,
2873 (long long)cursor.data->entry.obj_id);
2874 error = 0;
2875 }
2876
2877 /*
2878 * If isdir >= 0 we validate that the entry is or is not a
2879 * directory. If isdir < 0 we don't care.
2880 */
2881 if (error == 0 && isdir >= 0 && ip) {
2882 if (isdir &&
2883 ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) {
2884 error = ENOTDIR;
2885 } else if (isdir == 0 &&
2886 ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
2887 error = EISDIR;
2888 }
2889 }
2890
2891 /*
2892 * If we are trying to remove a directory the directory must
2893 * be empty.
2894 *
2895 * The check directory code can loop and deadlock/retry. Our
2896 * own cursor's node locks must be released to avoid a 3-way
2897 * deadlock with the flusher if the check directory code
2898 * blocks.
2899 *
2900 * If any changes whatsoever have been made to the cursor
2901 * set EDEADLK and retry.
2902 */
2903 if (error == 0 && ip && ip->ino_data.obj_type ==
2904 HAMMER_OBJTYPE_DIRECTORY) {
2905 hammer_unlock_cursor(&cursor);
2906 error = hammer_ip_check_directory_empty(trans, ip);
2907 hammer_lock_cursor(&cursor);
2908 if (cursor.flags & HAMMER_CURSOR_RETEST) {
2909 kprintf("HAMMER: Warning: avoided deadlock "
2910 "on rmdir '%s'\n",
2911 ncp->nc_name);
2912 error = EDEADLK;
2913 }
2914 }
2915
2916 /*
2917 * Delete the directory entry.
2918 *
2919 * WARNING: hammer_ip_del_directory() may have to terminate
2920 * the cursor to avoid a deadlock. It is ok to call
2921 * hammer_done_cursor() twice.
2922 */
2923 if (error == 0) {
2924 error = hammer_ip_del_directory(trans, &cursor,
2925 dip, ip);
2926 }
2927 hammer_done_cursor(&cursor);
2928 if (error == 0) {
2929 cache_setunresolved(nch);
2930 cache_setvp(nch, NULL);
2931 /* XXX locking */
2932 if (ip && ip->vp) {
2933 hammer_knote(ip->vp, NOTE_DELETE);
2934 cache_inval_vp(ip->vp, CINV_DESTROY);
2935 }
2936 }
2937 if (ip)
2938 hammer_rel_inode(ip, 0);
2939 } else {
2940 hammer_done_cursor(&cursor);
2941 }
2942 if (error == EDEADLK)
2943 goto retry;
2944
2945 return (error);
2946 }
2947
2948 /************************************************************************
2949 * FIFO AND SPECFS OPS *
2950 ************************************************************************
2951 *
2952 */
2953
2954 static int
2955 hammer_vop_fifoclose (struct vop_close_args *ap)
2956 {
2957 /* XXX update itimes */
2958 return (VOCALL(&fifo_vnode_vops, &ap->a_head));
2959 }
2960
2961 static int
2962 hammer_vop_fiforead (struct vop_read_args *ap)
2963 {
2964 int error;
2965
2966 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2967 /* XXX update access time */
2968 return (error);
2969 }
2970
2971 static int
2972 hammer_vop_fifowrite (struct vop_write_args *ap)
2973 {
2974 int error;
2975
2976 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2977 /* XXX update access time */
2978 return (error);
2979 }
2980
2981 static
2982 int
2983 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap)
2984 {
2985 int error;
2986
2987 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2988 if (error)
2989 error = hammer_vop_kqfilter(ap);
2990 return(error);
2991 }
2992
2993 static int
2994 hammer_vop_specclose (struct vop_close_args *ap)
2995 {
2996 /* XXX update itimes */
2997 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2998 }
2999
3000 static int
3001 hammer_vop_specread (struct vop_read_args *ap)
3002 {
3003 /* XXX update access time */
3004 return (VOCALL(&spec_vnode_vops, &ap->a_head));
3005 }
3006
3007 static int
3008 hammer_vop_specwrite (struct vop_write_args *ap)
3009 {
3010 /* XXX update last change time */
3011 return (VOCALL(&spec_vnode_vops, &ap->a_head));
3012 }
3013
3014 /*
3015 * SPECFS's getattr will override fields as necessary, but does not fill
3016 * stuff in from scratch.
3017 */
3018 static
3019 int
3020 hammer_vop_specgetattr (struct vop_getattr_args *ap)
3021 {
3022 int error;
3023
3024 error = hammer_vop_getattr(ap);
3025 if (error == 0)
3026 VOCALL(&spec_vnode_vops, &ap->a_head);
3027 return (error);
3028 }
3029
3030
3031 /************************************************************************
3032 * KQFILTER OPS *
3033 ************************************************************************
3034 *
3035 */
3036 static void filt_hammerdetach(struct knote *kn);
3037 static int filt_hammerread(struct knote *kn, long hint);
3038 static int filt_hammerwrite(struct knote *kn, long hint);
3039 static int filt_hammervnode(struct knote *kn, long hint);
3040
3041 static struct filterops hammerread_filtops =
3042 { 1, NULL, filt_hammerdetach, filt_hammerread };
3043 static struct filterops hammerwrite_filtops =
3044 { 1, NULL, filt_hammerdetach, filt_hammerwrite };
3045 static struct filterops hammervnode_filtops =
3046 { 1, NULL, filt_hammerdetach, filt_hammervnode };
3047
3048 static
3049 int
3050 hammer_vop_kqfilter(struct vop_kqfilter_args *ap)
3051 {
3052 struct vnode *vp = ap->a_vp;
3053 struct knote *kn = ap->a_kn;
3054 lwkt_tokref ilock;
3055
3056 switch (kn->kn_filter) {
3057 case EVFILT_READ:
3058 kn->kn_fop = &hammerread_filtops;
3059 break;
3060 case EVFILT_WRITE:
3061 kn->kn_fop = &hammerwrite_filtops;
3062 break;
3063 case EVFILT_VNODE:
3064 kn->kn_fop = &hammervnode_filtops;
3065 break;
3066 default:
3067 return (1);
3068 }
3069
3070 kn->kn_hook = (caddr_t)vp;
3071
3072 lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token);
3073 SLIST_INSERT_HEAD(&vp->v_pollinfo.vpi_selinfo.si_note, kn, kn_selnext);
3074 lwkt_reltoken(&ilock);
3075
3076 return(0);
3077 }
3078
3079 static void
3080 filt_hammerdetach(struct knote *kn)
3081 {
3082 struct vnode *vp = (void *)kn->kn_hook;
3083 lwkt_tokref ilock;
3084
3085 lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token);
3086 SLIST_REMOVE(&vp->v_pollinfo.vpi_selinfo.si_note,
3087 kn, knote, kn_selnext);
3088 lwkt_reltoken(&ilock);
3089 }
3090
3091 static int
3092 filt_hammerread(struct knote *kn, long hint)
3093 {
3094 struct vnode *vp = (void *)kn->kn_hook;
3095 hammer_inode_t ip = VTOI(vp);
3096
3097 if (hint == NOTE_REVOKE) {
3098 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
3099 return(1);
3100 }
3101 kn->kn_data = ip->ino_data.size - kn->kn_fp->f_offset;
3102 return (kn->kn_data != 0);
3103 }
3104
3105 static int
3106 filt_hammerwrite(struct knote *kn, long hint)
3107 {
3108 if (hint == NOTE_REVOKE)
3109 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
3110 kn->kn_data = 0;
3111 return (1);
3112 }
3113
3114 static int
3115 filt_hammervnode(struct knote *kn, long hint)
3116 {
3117 if (kn->kn_sfflags & hint)
3118 kn->kn_fflags |= hint;
3119 if (hint == NOTE_REVOKE) {
3120 kn->kn_flags |= EV_EOF;
3121 return (1);
3122 }
3123 return (kn->kn_fflags != 0);
3124 }
3125
DragonFly BSD