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Fix a buffer cache deadlock which can occur when simulated disk devices
[dragonfly.git] / sys / vfs / hammer / hammer_vnops.c
blob7c443c8c999c6243cd710eac5352c30d19705113
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_setattr(struct vop_setattr_args *);
77 static int hammer_vop_strategy(struct vop_strategy_args *);
78 static int hammer_vop_bmap(struct vop_bmap_args *ap);
79 static int hammer_vop_nsymlink(struct vop_nsymlink_args *);
80 static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *);
81 static int hammer_vop_ioctl(struct vop_ioctl_args *);
82 static int hammer_vop_mountctl(struct vop_mountctl_args *);
83 static int hammer_vop_kqfilter (struct vop_kqfilter_args *);
84
85 static int hammer_vop_fifoclose (struct vop_close_args *);
86 static int hammer_vop_fiforead (struct vop_read_args *);
87 static int hammer_vop_fifowrite (struct vop_write_args *);
88 static int hammer_vop_fifokqfilter (struct vop_kqfilter_args *);
89
90 static int hammer_vop_specclose (struct vop_close_args *);
91 static int hammer_vop_specread (struct vop_read_args *);
92 static int hammer_vop_specwrite (struct vop_write_args *);
93
94 struct vop_ops hammer_vnode_vops = {
95 .vop_default = vop_defaultop,
96 .vop_fsync = hammer_vop_fsync,
97 .vop_getpages = vop_stdgetpages,
98 .vop_putpages = vop_stdputpages,
99 .vop_read = hammer_vop_read,
100 .vop_write = hammer_vop_write,
101 .vop_access = hammer_vop_access,
102 .vop_advlock = hammer_vop_advlock,
103 .vop_close = hammer_vop_close,
104 .vop_ncreate = hammer_vop_ncreate,
105 .vop_getattr = hammer_vop_getattr,
106 .vop_inactive = hammer_vop_inactive,
107 .vop_reclaim = hammer_vop_reclaim,
108 .vop_nresolve = hammer_vop_nresolve,
109 .vop_nlookupdotdot = hammer_vop_nlookupdotdot,
110 .vop_nlink = hammer_vop_nlink,
111 .vop_nmkdir = hammer_vop_nmkdir,
112 .vop_nmknod = hammer_vop_nmknod,
113 .vop_open = hammer_vop_open,
114 .vop_pathconf = vop_stdpathconf,
115 .vop_print = hammer_vop_print,
116 .vop_readdir = hammer_vop_readdir,
117 .vop_readlink = hammer_vop_readlink,
118 .vop_nremove = hammer_vop_nremove,
119 .vop_nrename = hammer_vop_nrename,
120 .vop_nrmdir = hammer_vop_nrmdir,
121 .vop_setattr = hammer_vop_setattr,
122 .vop_bmap = hammer_vop_bmap,
123 .vop_strategy = hammer_vop_strategy,
124 .vop_nsymlink = hammer_vop_nsymlink,
125 .vop_nwhiteout = hammer_vop_nwhiteout,
126 .vop_ioctl = hammer_vop_ioctl,
127 .vop_mountctl = hammer_vop_mountctl,
128 .vop_kqfilter = hammer_vop_kqfilter
129 };
130
131 struct vop_ops hammer_spec_vops = {
132 .vop_default = spec_vnoperate,
133 .vop_fsync = hammer_vop_fsync,
134 .vop_read = hammer_vop_specread,
135 .vop_write = hammer_vop_specwrite,
136 .vop_access = hammer_vop_access,
137 .vop_close = hammer_vop_specclose,
138 .vop_getattr = hammer_vop_getattr,
139 .vop_inactive = hammer_vop_inactive,
140 .vop_reclaim = hammer_vop_reclaim,
141 .vop_setattr = hammer_vop_setattr
142 };
143
144 struct vop_ops hammer_fifo_vops = {
145 .vop_default = fifo_vnoperate,
146 .vop_fsync = hammer_vop_fsync,
147 .vop_read = hammer_vop_fiforead,
148 .vop_write = hammer_vop_fifowrite,
149 .vop_access = hammer_vop_access,
150 .vop_close = hammer_vop_fifoclose,
151 .vop_getattr = hammer_vop_getattr,
152 .vop_inactive = hammer_vop_inactive,
153 .vop_reclaim = hammer_vop_reclaim,
154 .vop_setattr = hammer_vop_setattr,
155 .vop_kqfilter = hammer_vop_fifokqfilter
156 };
157
158 static __inline
159 void
160 hammer_knote(struct vnode *vp, int flags)
161 {
162 if (flags)
163 KNOTE(&vp->v_pollinfo.vpi_selinfo.si_note, flags);
164 }
165
166 #ifdef DEBUG_TRUNCATE
167 struct hammer_inode *HammerTruncIp;
168 #endif
169
170 static int hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
171 struct vnode *dvp, struct ucred *cred,
172 int flags, int isdir);
173 static int hammer_vop_strategy_read(struct vop_strategy_args *ap);
174 static int hammer_vop_strategy_write(struct vop_strategy_args *ap);
175
176 #if 0
177 static
178 int
179 hammer_vop_vnoperate(struct vop_generic_args *)
180 {
181 return (VOCALL(&hammer_vnode_vops, ap));
182 }
183 #endif
184
185 /*
186 * hammer_vop_fsync { vp, waitfor }
187 *
188 * fsync() an inode to disk and wait for it to be completely committed
189 * such that the information would not be undone if a crash occured after
190 * return.
191 */
192 static
193 int
194 hammer_vop_fsync(struct vop_fsync_args *ap)
195 {
196 hammer_inode_t ip = VTOI(ap->a_vp);
197
198 ++hammer_count_fsyncs;
199 vfsync(ap->a_vp, ap->a_waitfor, 1, NULL, NULL);
200 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
201 if (ap->a_waitfor == MNT_WAIT) {
202 vn_unlock(ap->a_vp);
203 hammer_wait_inode(ip);
204 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
205 }
206 return (ip->error);
207 }
208
209 /*
210 * hammer_vop_read { vp, uio, ioflag, cred }
211 */
212 static
213 int
214 hammer_vop_read(struct vop_read_args *ap)
215 {
216 struct hammer_transaction trans;
217 hammer_inode_t ip;
218 off_t offset;
219 struct buf *bp;
220 struct uio *uio;
221 int error;
222 int n;
223 int seqcount;
224 int ioseqcount;
225 int blksize;
226
227 if (ap->a_vp->v_type != VREG)
228 return (EINVAL);
229 ip = VTOI(ap->a_vp);
230 error = 0;
231 uio = ap->a_uio;
232
233 /*
234 * Allow the UIO's size to override the sequential heuristic.
235 */
236 blksize = hammer_blocksize(uio->uio_offset);
237 seqcount = (uio->uio_resid + (blksize - 1)) / blksize;
238 ioseqcount = ap->a_ioflag >> 16;
239 if (seqcount < ioseqcount)
240 seqcount = ioseqcount;
241
242 hammer_start_transaction(&trans, ip->hmp);
243
244 /*
245 * Access the data typically in HAMMER_BUFSIZE blocks via the
246 * buffer cache, but HAMMER may use a variable block size based
247 * on the offset.
248 */
249 while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) {
250 int64_t base_offset;
251 int64_t file_limit;
252
253 blksize = hammer_blocksize(uio->uio_offset);
254 offset = (int)uio->uio_offset & (blksize - 1);
255 base_offset = uio->uio_offset - offset;
256
257 if (hammer_cluster_enable) {
258 /*
259 * Use file_limit to prevent cluster_read() from
260 * creating buffers of the wrong block size past
261 * the demarc.
262 */
263 file_limit = ip->ino_data.size;
264 if (base_offset < HAMMER_XDEMARC &&
265 file_limit > HAMMER_XDEMARC) {
266 file_limit = HAMMER_XDEMARC;
267 }
268 error = cluster_read(ap->a_vp,
269 file_limit, base_offset,
270 blksize, MAXPHYS,
271 seqcount, &bp);
272 } else {
273 error = bread(ap->a_vp, base_offset, blksize, &bp);
274 }
275 if (error) {
276 kprintf("error %d\n", error);
277 brelse(bp);
278 break;
279 }
280
281 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
282 n = blksize - offset;
283 if (n > uio->uio_resid)
284 n = uio->uio_resid;
285 if (n > ip->ino_data.size - uio->uio_offset)
286 n = (int)(ip->ino_data.size - uio->uio_offset);
287 error = uiomove((char *)bp->b_data + offset, n, uio);
288
289 /* data has a lower priority then meta-data */
290 bp->b_flags |= B_AGE;
291 bqrelse(bp);
292 if (error)
293 break;
294 hammer_stats_file_read += n;
295 }
296 if ((ip->flags & HAMMER_INODE_RO) == 0 &&
297 (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) {
298 ip->ino_data.atime = trans.time;
299 hammer_modify_inode(ip, HAMMER_INODE_ATIME);
300 }
301 hammer_done_transaction(&trans);
302 return (error);
303 }
304
305 /*
306 * hammer_vop_write { vp, uio, ioflag, cred }
307 */
308 static
309 int
310 hammer_vop_write(struct vop_write_args *ap)
311 {
312 struct hammer_transaction trans;
313 struct hammer_inode *ip;
314 hammer_mount_t hmp;
315 struct uio *uio;
316 int offset;
317 off_t base_offset;
318 struct buf *bp;
319 int kflags;
320 int error;
321 int n;
322 int flags;
323 int delta;
324 int seqcount;
325
326 if (ap->a_vp->v_type != VREG)
327 return (EINVAL);
328 ip = VTOI(ap->a_vp);
329 hmp = ip->hmp;
330 error = 0;
331 kflags = 0;
332 seqcount = ap->a_ioflag >> 16;
333
334 if (ip->flags & HAMMER_INODE_RO)
335 return (EROFS);
336
337 /*
338 * Create a transaction to cover the operations we perform.
339 */
340 hammer_start_transaction(&trans, hmp);
341 uio = ap->a_uio;
342
343 /*
344 * Check append mode
345 */
346 if (ap->a_ioflag & IO_APPEND)
347 uio->uio_offset = ip->ino_data.size;
348
349 /*
350 * Check for illegal write offsets. Valid range is 0...2^63-1.
351 *
352 * NOTE: the base_off assignment is required to work around what
353 * I consider to be a GCC-4 optimization bug.
354 */
355 if (uio->uio_offset < 0) {
356 hammer_done_transaction(&trans);
357 return (EFBIG);
358 }
359 base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */
360 if (uio->uio_resid > 0 && base_offset <= 0) {
361 hammer_done_transaction(&trans);
362 return (EFBIG);
363 }
364
365 /*
366 * Access the data typically in HAMMER_BUFSIZE blocks via the
367 * buffer cache, but HAMMER may use a variable block size based
368 * on the offset.
369 */
370 while (uio->uio_resid > 0) {
371 int fixsize = 0;
372 int blksize;
373 int blkmask;
374
375 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0)
376 break;
377
378 blksize = hammer_blocksize(uio->uio_offset);
379
380 /*
381 * Do not allow HAMMER to blow out the buffer cache. Very
382 * large UIOs can lockout other processes due to bwillwrite()
383 * mechanics.
384 *
385 * The hammer inode is not locked during these operations.
386 * The vnode is locked which can interfere with the pageout
387 * daemon for non-UIO_NOCOPY writes but should not interfere
388 * with the buffer cache. Even so, we cannot afford to
389 * allow the pageout daemon to build up too many dirty buffer
390 * cache buffers.
391 *
392 * Only call this if we aren't being recursively called from
393 * a virtual disk device (vn), else we may deadlock.
394 */
395 if ((ap->a_ioflag & IO_RECURSE) == 0)
396 bwillwrite(blksize);
397
398 /*
399 * Do not allow HAMMER to blow out system memory by
400 * accumulating too many records. Records are so well
401 * decoupled from the buffer cache that it is possible
402 * for userland to push data out to the media via
403 * direct-write, but build up the records queued to the
404 * backend faster then the backend can flush them out.
405 * HAMMER has hit its write limit but the frontend has
406 * no pushback to slow it down.
407 */
408 if (hmp->rsv_recs > hammer_limit_recs / 2) {
409 /*
410 * Get the inode on the flush list
411 */
412 if (ip->rsv_recs >= 64)
413 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
414 else if (ip->rsv_recs >= 16)
415 hammer_flush_inode(ip, 0);
416
417 /*
418 * Keep the flusher going if the system keeps
419 * queueing records.
420 */
421 delta = hmp->count_newrecords -
422 hmp->last_newrecords;
423 if (delta < 0 || delta > hammer_limit_recs / 2) {
424 hmp->last_newrecords = hmp->count_newrecords;
425 hammer_sync_hmp(hmp, MNT_NOWAIT);
426 }
427
428 /*
429 * If we have gotten behind start slowing
430 * down the writers.
431 */
432 delta = (hmp->rsv_recs - hammer_limit_recs) *
433 hz / hammer_limit_recs;
434 if (delta > 0)
435 tsleep(&trans, 0, "hmrslo", delta);
436 }
437
438 /*
439 * Calculate the blocksize at the current offset and figure
440 * out how much we can actually write.
441 */
442 blkmask = blksize - 1;
443 offset = (int)uio->uio_offset & blkmask;
444 base_offset = uio->uio_offset & ~(int64_t)blkmask;
445 n = blksize - offset;
446 if (n > uio->uio_resid)
447 n = uio->uio_resid;
448 if (uio->uio_offset + n > ip->ino_data.size) {
449 vnode_pager_setsize(ap->a_vp, uio->uio_offset + n);
450 fixsize = 1;
451 kflags |= NOTE_EXTEND;
452 }
453
454 if (uio->uio_segflg == UIO_NOCOPY) {
455 /*
456 * Issuing a write with the same data backing the
457 * buffer. Instantiate the buffer to collect the
458 * backing vm pages, then read-in any missing bits.
459 *
460 * This case is used by vop_stdputpages().
461 */
462 bp = getblk(ap->a_vp, base_offset,
463 blksize, GETBLK_BHEAVY, 0);
464 if ((bp->b_flags & B_CACHE) == 0) {
465 bqrelse(bp);
466 error = bread(ap->a_vp, base_offset,
467 blksize, &bp);
468 }
469 } else if (offset == 0 && uio->uio_resid >= blksize) {
470 /*
471 * Even though we are entirely overwriting the buffer
472 * we may still have to zero it out to avoid a
473 * mmap/write visibility issue.
474 */
475 bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0);
476 if ((bp->b_flags & B_CACHE) == 0)
477 vfs_bio_clrbuf(bp);
478 } else if (base_offset >= ip->ino_data.size) {
479 /*
480 * If the base offset of the buffer is beyond the
481 * file EOF, we don't have to issue a read.
482 */
483 bp = getblk(ap->a_vp, base_offset,
484 blksize, GETBLK_BHEAVY, 0);
485 vfs_bio_clrbuf(bp);
486 } else {
487 /*
488 * Partial overwrite, read in any missing bits then
489 * replace the portion being written.
490 */
491 error = bread(ap->a_vp, base_offset, blksize, &bp);
492 if (error == 0)
493 bheavy(bp);
494 }
495 if (error == 0) {
496 error = uiomove((char *)bp->b_data + offset,
497 n, uio);
498 }
499
500 /*
501 * If we screwed up we have to undo any VM size changes we
502 * made.
503 */
504 if (error) {
505 brelse(bp);
506 if (fixsize) {
507 vtruncbuf(ap->a_vp, ip->ino_data.size,
508 hammer_blocksize(ip->ino_data.size));
509 }
510 break;
511 }
512 kflags |= NOTE_WRITE;
513 hammer_stats_file_write += n;
514 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
515 if (ip->ino_data.size < uio->uio_offset) {
516 ip->ino_data.size = uio->uio_offset;
517 flags = HAMMER_INODE_DDIRTY;
518 vnode_pager_setsize(ap->a_vp, ip->ino_data.size);
519 } else {
520 flags = 0;
521 }
522 ip->ino_data.mtime = trans.time;
523 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS;
524 hammer_modify_inode(ip, flags);
525
526 /*
527 * Once we dirty the buffer any cached zone-X offset
528 * becomes invalid. HAMMER NOTE: no-history mode cannot
529 * allow overwriting over the same data sector unless
530 * we provide UNDOs for the old data, which we don't.
531 */
532 bp->b_bio2.bio_offset = NOOFFSET;
533
534 /*
535 * Final buffer disposition.
536 */
537 bp->b_flags |= B_AGE;
538 if (ap->a_ioflag & IO_SYNC) {
539 bwrite(bp);
540 } else if (ap->a_ioflag & IO_DIRECT) {
541 bawrite(bp);
542 } else {
543 bdwrite(bp);
544 }
545 }
546 hammer_done_transaction(&trans);
547 hammer_knote(ap->a_vp, kflags);
548 return (error);
549 }
550
551 /*
552 * hammer_vop_access { vp, mode, cred }
553 */
554 static
555 int
556 hammer_vop_access(struct vop_access_args *ap)
557 {
558 struct hammer_inode *ip = VTOI(ap->a_vp);
559 uid_t uid;
560 gid_t gid;
561 int error;
562
563 ++hammer_stats_file_iopsr;
564 uid = hammer_to_unix_xid(&ip->ino_data.uid);
565 gid = hammer_to_unix_xid(&ip->ino_data.gid);
566
567 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
568 ip->ino_data.uflags);
569 return (error);
570 }
571
572 /*
573 * hammer_vop_advlock { vp, id, op, fl, flags }
574 */
575 static
576 int
577 hammer_vop_advlock(struct vop_advlock_args *ap)
578 {
579 hammer_inode_t ip = VTOI(ap->a_vp);
580
581 return (lf_advlock(ap, &ip->advlock, ip->ino_data.size));
582 }
583
584 /*
585 * hammer_vop_close { vp, fflag }
586 */
587 static
588 int
589 hammer_vop_close(struct vop_close_args *ap)
590 {
591 /*hammer_inode_t ip = VTOI(ap->a_vp);*/
592 return (vop_stdclose(ap));
593 }
594
595 /*
596 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
597 *
598 * The operating system has already ensured that the directory entry
599 * does not exist and done all appropriate namespace locking.
600 */
601 static
602 int
603 hammer_vop_ncreate(struct vop_ncreate_args *ap)
604 {
605 struct hammer_transaction trans;
606 struct hammer_inode *dip;
607 struct hammer_inode *nip;
608 struct nchandle *nch;
609 int error;
610
611 nch = ap->a_nch;
612 dip = VTOI(ap->a_dvp);
613
614 if (dip->flags & HAMMER_INODE_RO)
615 return (EROFS);
616 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
617 return (error);
618
619 /*
620 * Create a transaction to cover the operations we perform.
621 */
622 hammer_start_transaction(&trans, dip->hmp);
623 ++hammer_stats_file_iopsw;
624
625 /*
626 * Create a new filesystem object of the requested type. The
627 * returned inode will be referenced and shared-locked to prevent
628 * it from being moved to the flusher.
629 */
630
631 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
632 dip, NULL, &nip);
633 if (error) {
634 hkprintf("hammer_create_inode error %d\n", error);
635 hammer_done_transaction(&trans);
636 *ap->a_vpp = NULL;
637 return (error);
638 }
639
640 /*
641 * Add the new filesystem object to the directory. This will also
642 * bump the inode's link count.
643 */
644 error = hammer_ip_add_directory(&trans, dip,
645 nch->ncp->nc_name, nch->ncp->nc_nlen,
646 nip);
647 if (error)
648 hkprintf("hammer_ip_add_directory error %d\n", error);
649
650 /*
651 * Finish up.
652 */
653 if (error) {
654 hammer_rel_inode(nip, 0);
655 hammer_done_transaction(&trans);
656 *ap->a_vpp = NULL;
657 } else {
658 error = hammer_get_vnode(nip, ap->a_vpp);
659 hammer_done_transaction(&trans);
660 hammer_rel_inode(nip, 0);
661 if (error == 0) {
662 cache_setunresolved(ap->a_nch);
663 cache_setvp(ap->a_nch, *ap->a_vpp);
664 }
665 hammer_knote(ap->a_dvp, NOTE_WRITE);
666 }
667 return (error);
668 }
669
670 /*
671 * hammer_vop_getattr { vp, vap }
672 *
673 * Retrieve an inode's attribute information. When accessing inodes
674 * historically we fake the atime field to ensure consistent results.
675 * The atime field is stored in the B-Tree element and allowed to be
676 * updated without cycling the element.
677 */
678 static
679 int
680 hammer_vop_getattr(struct vop_getattr_args *ap)
681 {
682 struct hammer_inode *ip = VTOI(ap->a_vp);
683 struct vattr *vap = ap->a_vap;
684
685 /*
686 * We want the fsid to be different when accessing a filesystem
687 * with different as-of's so programs like diff don't think
688 * the files are the same.
689 *
690 * We also want the fsid to be the same when comparing snapshots,
691 * or when comparing mirrors (which might be backed by different
692 * physical devices). HAMMER fsids are based on the PFS's
693 * shared_uuid field.
694 *
695 * XXX there is a chance of collision here. The va_fsid reported
696 * by stat is different from the more involved fsid used in the
697 * mount structure.
698 */
699 ++hammer_stats_file_iopsr;
700 vap->va_fsid = ip->pfsm->fsid_udev ^ (u_int32_t)ip->obj_asof ^
701 (u_int32_t)(ip->obj_asof >> 32);
702
703 vap->va_fileid = ip->ino_leaf.base.obj_id;
704 vap->va_mode = ip->ino_data.mode;
705 vap->va_nlink = ip->ino_data.nlinks;
706 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
707 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
708 vap->va_rmajor = 0;
709 vap->va_rminor = 0;
710 vap->va_size = ip->ino_data.size;
711
712 /*
713 * Special case for @@PFS softlinks. The actual size of the
714 * expanded softlink is "@@0x%016llx:%05d" == 26 bytes.
715 */
716 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK &&
717 ip->ino_data.size == 10 &&
718 ip->obj_asof == HAMMER_MAX_TID &&
719 ip->obj_localization == 0 &&
720 strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) {
721 vap->va_size = 26;
722 }
723
724 /*
725 * We must provide a consistent atime and mtime for snapshots
726 * so people can do a 'tar cf - ... | md5' on them and get
727 * consistent results.
728 */
729 if (ip->flags & HAMMER_INODE_RO) {
730 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime);
731 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime);
732 } else {
733 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime);
734 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime);
735 }
736 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
737 vap->va_flags = ip->ino_data.uflags;
738 vap->va_gen = 1; /* hammer inums are unique for all time */
739 vap->va_blocksize = HAMMER_BUFSIZE;
740 if (ip->ino_data.size >= HAMMER_XDEMARC) {
741 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) &
742 ~HAMMER_XBUFMASK64;
743 } else if (ip->ino_data.size > HAMMER_BUFSIZE / 2) {
744 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) &
745 ~HAMMER_BUFMASK64;
746 } else {
747 vap->va_bytes = (ip->ino_data.size + 15) & ~15;
748 }
749
750 vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type);
751 vap->va_filerev = 0; /* XXX */
752 /* mtime uniquely identifies any adjustments made to the file XXX */
753 vap->va_fsmid = ip->ino_data.mtime;
754 vap->va_uid_uuid = ip->ino_data.uid;
755 vap->va_gid_uuid = ip->ino_data.gid;
756 vap->va_fsid_uuid = ip->hmp->fsid;
757 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
758 VA_FSID_UUID_VALID;
759
760 switch (ip->ino_data.obj_type) {
761 case HAMMER_OBJTYPE_CDEV:
762 case HAMMER_OBJTYPE_BDEV:
763 vap->va_rmajor = ip->ino_data.rmajor;
764 vap->va_rminor = ip->ino_data.rminor;
765 break;
766 default:
767 break;
768 }
769 return(0);
770 }
771
772 /*
773 * hammer_vop_nresolve { nch, dvp, cred }
774 *
775 * Locate the requested directory entry.
776 */
777 static
778 int
779 hammer_vop_nresolve(struct vop_nresolve_args *ap)
780 {
781 struct hammer_transaction trans;
782 struct namecache *ncp;
783 hammer_inode_t dip;
784 hammer_inode_t ip;
785 hammer_tid_t asof;
786 struct hammer_cursor cursor;
787 struct vnode *vp;
788 int64_t namekey;
789 int error;
790 int i;
791 int nlen;
792 int flags;
793 int ispfs;
794 int64_t obj_id;
795 u_int32_t localization;
796 u_int32_t max_iterations;
797
798 /*
799 * Misc initialization, plus handle as-of name extensions. Look for
800 * the '@@' extension. Note that as-of files and directories cannot
801 * be modified.
802 */
803 dip = VTOI(ap->a_dvp);
804 ncp = ap->a_nch->ncp;
805 asof = dip->obj_asof;
806 localization = dip->obj_localization; /* for code consistency */
807 nlen = ncp->nc_nlen;
808 flags = dip->flags & HAMMER_INODE_RO;
809 ispfs = 0;
810
811 hammer_simple_transaction(&trans, dip->hmp);
812 ++hammer_stats_file_iopsr;
813
814 for (i = 0; i < nlen; ++i) {
815 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
816 error = hammer_str_to_tid(ncp->nc_name + i + 2,
817 &ispfs, &asof, &localization);
818 if (error != 0) {
819 i = nlen;
820 break;
821 }
822 if (asof != HAMMER_MAX_TID)
823 flags |= HAMMER_INODE_RO;
824 break;
825 }
826 }
827 nlen = i;
828
829 /*
830 * If this is a PFS softlink we dive into the PFS
831 */
832 if (ispfs && nlen == 0) {
833 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT,
834 asof, localization,
835 flags, &error);
836 if (error == 0) {
837 error = hammer_get_vnode(ip, &vp);
838 hammer_rel_inode(ip, 0);
839 } else {
840 vp = NULL;
841 }
842 if (error == 0) {
843 vn_unlock(vp);
844 cache_setvp(ap->a_nch, vp);
845 vrele(vp);
846 }
847 goto done;
848 }
849
850 /*
851 * If there is no path component the time extension is relative to
852 * dip.
853 */
854 if (nlen == 0) {
855 ip = hammer_get_inode(&trans, dip, dip->obj_id,
856 asof, dip->obj_localization,
857 flags, &error);
858 if (error == 0) {
859 error = hammer_get_vnode(ip, &vp);
860 hammer_rel_inode(ip, 0);
861 } else {
862 vp = NULL;
863 }
864 if (error == 0) {
865 vn_unlock(vp);
866 cache_setvp(ap->a_nch, vp);
867 vrele(vp);
868 }
869 goto done;
870 }
871
872 /*
873 * Calculate the namekey and setup the key range for the scan. This
874 * works kinda like a chained hash table where the lower 32 bits
875 * of the namekey synthesize the chain.
876 *
877 * The key range is inclusive of both key_beg and key_end.
878 */
879 namekey = hammer_directory_namekey(dip, ncp->nc_name, nlen,
880 &max_iterations);
881
882 error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip);
883 cursor.key_beg.localization = dip->obj_localization +
884 HAMMER_LOCALIZE_MISC;
885 cursor.key_beg.obj_id = dip->obj_id;
886 cursor.key_beg.key = namekey;
887 cursor.key_beg.create_tid = 0;
888 cursor.key_beg.delete_tid = 0;
889 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
890 cursor.key_beg.obj_type = 0;
891
892 cursor.key_end = cursor.key_beg;
893 cursor.key_end.key += max_iterations;
894 cursor.asof = asof;
895 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
896
897 /*
898 * Scan all matching records (the chain), locate the one matching
899 * the requested path component.
900 *
901 * The hammer_ip_*() functions merge in-memory records with on-disk
902 * records for the purposes of the search.
903 */
904 obj_id = 0;
905 localization = HAMMER_DEF_LOCALIZATION;
906
907 if (error == 0) {
908 error = hammer_ip_first(&cursor);
909 while (error == 0) {
910 error = hammer_ip_resolve_data(&cursor);
911 if (error)
912 break;
913 if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF &&
914 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
915 obj_id = cursor.data->entry.obj_id;
916 localization = cursor.data->entry.localization;
917 break;
918 }
919 error = hammer_ip_next(&cursor);
920 }
921 }
922 hammer_done_cursor(&cursor);
923 if (error == 0) {
924 ip = hammer_get_inode(&trans, dip, obj_id,
925 asof, localization,
926 flags, &error);
927 if (error == 0) {
928 error = hammer_get_vnode(ip, &vp);
929 hammer_rel_inode(ip, 0);
930 } else {
931 vp = NULL;
932 }
933 if (error == 0) {
934 vn_unlock(vp);
935 cache_setvp(ap->a_nch, vp);
936 vrele(vp);
937 }
938 } else if (error == ENOENT) {
939 cache_setvp(ap->a_nch, NULL);
940 }
941 done:
942 hammer_done_transaction(&trans);
943 return (error);
944 }
945
946 /*
947 * hammer_vop_nlookupdotdot { dvp, vpp, cred }
948 *
949 * Locate the parent directory of a directory vnode.
950 *
951 * dvp is referenced but not locked. *vpp must be returned referenced and
952 * locked. A parent_obj_id of 0 does not necessarily indicate that we are
953 * at the root, instead it could indicate that the directory we were in was
954 * removed.
955 *
956 * NOTE: as-of sequences are not linked into the directory structure. If
957 * we are at the root with a different asof then the mount point, reload
958 * the same directory with the mount point's asof. I'm not sure what this
959 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not
960 * get confused, but it hasn't been tested.
961 */
962 static
963 int
964 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
965 {
966 struct hammer_transaction trans;
967 struct hammer_inode *dip;
968 struct hammer_inode *ip;
969 int64_t parent_obj_id;
970 u_int32_t parent_obj_localization;
971 hammer_tid_t asof;
972 int error;
973
974 dip = VTOI(ap->a_dvp);
975 asof = dip->obj_asof;
976
977 /*
978 * Whos are parent? This could be the root of a pseudo-filesystem
979 * whos parent is in another localization domain.
980 */
981 parent_obj_id = dip->ino_data.parent_obj_id;
982 if (dip->obj_id == HAMMER_OBJID_ROOT)
983 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization;
984 else
985 parent_obj_localization = dip->obj_localization;
986
987 if (parent_obj_id == 0) {
988 if (dip->obj_id == HAMMER_OBJID_ROOT &&
989 asof != dip->hmp->asof) {
990 parent_obj_id = dip->obj_id;
991 asof = dip->hmp->asof;
992 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK);
993 ksnprintf(*ap->a_fakename, 19, "0x%016llx",
994 dip->obj_asof);
995 } else {
996 *ap->a_vpp = NULL;
997 return ENOENT;
998 }
999 }
1000
1001 hammer_simple_transaction(&trans, dip->hmp);
1002 ++hammer_stats_file_iopsr;
1003
1004 ip = hammer_get_inode(&trans, dip, parent_obj_id,
1005 asof, parent_obj_localization,
1006 dip->flags, &error);
1007 if (ip) {
1008 error = hammer_get_vnode(ip, ap->a_vpp);
1009 hammer_rel_inode(ip, 0);
1010 } else {
1011 *ap->a_vpp = NULL;
1012 }
1013 hammer_done_transaction(&trans);
1014 return (error);
1015 }
1016
1017 /*
1018 * hammer_vop_nlink { nch, dvp, vp, cred }
1019 */
1020 static
1021 int
1022 hammer_vop_nlink(struct vop_nlink_args *ap)
1023 {
1024 struct hammer_transaction trans;
1025 struct hammer_inode *dip;
1026 struct hammer_inode *ip;
1027 struct nchandle *nch;
1028 int error;
1029
1030 if (ap->a_dvp->v_mount != ap->a_vp->v_mount)
1031 return(EXDEV);
1032
1033 nch = ap->a_nch;
1034 dip = VTOI(ap->a_dvp);
1035 ip = VTOI(ap->a_vp);
1036
1037 if (dip->obj_localization != ip->obj_localization)
1038 return(EXDEV);
1039
1040 if (dip->flags & HAMMER_INODE_RO)
1041 return (EROFS);
1042 if (ip->flags & HAMMER_INODE_RO)
1043 return (EROFS);
1044 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1045 return (error);
1046
1047 /*
1048 * Create a transaction to cover the operations we perform.
1049 */
1050 hammer_start_transaction(&trans, dip->hmp);
1051 ++hammer_stats_file_iopsw;
1052
1053 /*
1054 * Add the filesystem object to the directory. Note that neither
1055 * dip nor ip are referenced or locked, but their vnodes are
1056 * referenced. This function will bump the inode's link count.
1057 */
1058 error = hammer_ip_add_directory(&trans, dip,
1059 nch->ncp->nc_name, nch->ncp->nc_nlen,
1060 ip);
1061
1062 /*
1063 * Finish up.
1064 */
1065 if (error == 0) {
1066 cache_setunresolved(nch);
1067 cache_setvp(nch, ap->a_vp);
1068 }
1069 hammer_done_transaction(&trans);
1070 hammer_knote(ap->a_vp, NOTE_LINK);
1071 hammer_knote(ap->a_dvp, NOTE_WRITE);
1072 return (error);
1073 }
1074
1075 /*
1076 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
1077 *
1078 * The operating system has already ensured that the directory entry
1079 * does not exist and done all appropriate namespace locking.
1080 */
1081 static
1082 int
1083 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
1084 {
1085 struct hammer_transaction trans;
1086 struct hammer_inode *dip;
1087 struct hammer_inode *nip;
1088 struct nchandle *nch;
1089 int error;
1090
1091 nch = ap->a_nch;
1092 dip = VTOI(ap->a_dvp);
1093
1094 if (dip->flags & HAMMER_INODE_RO)
1095 return (EROFS);
1096 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1097 return (error);
1098
1099 /*
1100 * Create a transaction to cover the operations we perform.
1101 */
1102 hammer_start_transaction(&trans, dip->hmp);
1103 ++hammer_stats_file_iopsw;
1104
1105 /*
1106 * Create a new filesystem object of the requested type. The
1107 * returned inode will be referenced but not locked.
1108 */
1109 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1110 dip, NULL, &nip);
1111 if (error) {
1112 hkprintf("hammer_mkdir error %d\n", error);
1113 hammer_done_transaction(&trans);
1114 *ap->a_vpp = NULL;
1115 return (error);
1116 }
1117 /*
1118 * Add the new filesystem object to the directory. This will also
1119 * bump the inode's link count.
1120 */
1121 error = hammer_ip_add_directory(&trans, dip,
1122 nch->ncp->nc_name, nch->ncp->nc_nlen,
1123 nip);
1124 if (error)
1125 hkprintf("hammer_mkdir (add) error %d\n", error);
1126
1127 /*
1128 * Finish up.
1129 */
1130 if (error) {
1131 hammer_rel_inode(nip, 0);
1132 *ap->a_vpp = NULL;
1133 } else {
1134 error = hammer_get_vnode(nip, ap->a_vpp);
1135 hammer_rel_inode(nip, 0);
1136 if (error == 0) {
1137 cache_setunresolved(ap->a_nch);
1138 cache_setvp(ap->a_nch, *ap->a_vpp);
1139 }
1140 }
1141 hammer_done_transaction(&trans);
1142 if (error == 0)
1143 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1144 return (error);
1145 }
1146
1147 /*
1148 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
1149 *
1150 * The operating system has already ensured that the directory entry
1151 * does not exist and done all appropriate namespace locking.
1152 */
1153 static
1154 int
1155 hammer_vop_nmknod(struct vop_nmknod_args *ap)
1156 {
1157 struct hammer_transaction trans;
1158 struct hammer_inode *dip;
1159 struct hammer_inode *nip;
1160 struct nchandle *nch;
1161 int error;
1162
1163 nch = ap->a_nch;
1164 dip = VTOI(ap->a_dvp);
1165
1166 if (dip->flags & HAMMER_INODE_RO)
1167 return (EROFS);
1168 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1169 return (error);
1170
1171 /*
1172 * Create a transaction to cover the operations we perform.
1173 */
1174 hammer_start_transaction(&trans, dip->hmp);
1175 ++hammer_stats_file_iopsw;
1176
1177 /*
1178 * Create a new filesystem object of the requested type. The
1179 * returned inode will be referenced but not locked.
1180 *
1181 * If mknod specifies a directory a pseudo-fs is created.
1182 */
1183 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1184 dip, NULL, &nip);
1185 if (error) {
1186 hammer_done_transaction(&trans);
1187 *ap->a_vpp = NULL;
1188 return (error);
1189 }
1190
1191 /*
1192 * Add the new filesystem object to the directory. This will also
1193 * bump the inode's link count.
1194 */
1195 error = hammer_ip_add_directory(&trans, dip,
1196 nch->ncp->nc_name, nch->ncp->nc_nlen,
1197 nip);
1198
1199 /*
1200 * Finish up.
1201 */
1202 if (error) {
1203 hammer_rel_inode(nip, 0);
1204 *ap->a_vpp = NULL;
1205 } else {
1206 error = hammer_get_vnode(nip, ap->a_vpp);
1207 hammer_rel_inode(nip, 0);
1208 if (error == 0) {
1209 cache_setunresolved(ap->a_nch);
1210 cache_setvp(ap->a_nch, *ap->a_vpp);
1211 }
1212 }
1213 hammer_done_transaction(&trans);
1214 if (error == 0)
1215 hammer_knote(ap->a_dvp, NOTE_WRITE);
1216 return (error);
1217 }
1218
1219 /*
1220 * hammer_vop_open { vp, mode, cred, fp }
1221 */
1222 static
1223 int
1224 hammer_vop_open(struct vop_open_args *ap)
1225 {
1226 hammer_inode_t ip;
1227
1228 ++hammer_stats_file_iopsr;
1229 ip = VTOI(ap->a_vp);
1230
1231 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO))
1232 return (EROFS);
1233 return(vop_stdopen(ap));
1234 }
1235
1236 /*
1237 * hammer_vop_print { vp }
1238 */
1239 static
1240 int
1241 hammer_vop_print(struct vop_print_args *ap)
1242 {
1243 return EOPNOTSUPP;
1244 }
1245
1246 /*
1247 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
1248 */
1249 static
1250 int
1251 hammer_vop_readdir(struct vop_readdir_args *ap)
1252 {
1253 struct hammer_transaction trans;
1254 struct hammer_cursor cursor;
1255 struct hammer_inode *ip;
1256 struct uio *uio;
1257 hammer_base_elm_t base;
1258 int error;
1259 int cookie_index;
1260 int ncookies;
1261 off_t *cookies;
1262 off_t saveoff;
1263 int r;
1264 int dtype;
1265
1266 ++hammer_stats_file_iopsr;
1267 ip = VTOI(ap->a_vp);
1268 uio = ap->a_uio;
1269 saveoff = uio->uio_offset;
1270
1271 if (ap->a_ncookies) {
1272 ncookies = uio->uio_resid / 16 + 1;
1273 if (ncookies > 1024)
1274 ncookies = 1024;
1275 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
1276 cookie_index = 0;
1277 } else {
1278 ncookies = -1;
1279 cookies = NULL;
1280 cookie_index = 0;
1281 }
1282
1283 hammer_simple_transaction(&trans, ip->hmp);
1284
1285 /*
1286 * Handle artificial entries
1287 */
1288 error = 0;
1289 if (saveoff == 0) {
1290 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
1291 if (r)
1292 goto done;
1293 if (cookies)
1294 cookies[cookie_index] = saveoff;
1295 ++saveoff;
1296 ++cookie_index;
1297 if (cookie_index == ncookies)
1298 goto done;
1299 }
1300 if (saveoff == 1) {
1301 if (ip->ino_data.parent_obj_id) {
1302 r = vop_write_dirent(&error, uio,
1303 ip->ino_data.parent_obj_id,
1304 DT_DIR, 2, "..");
1305 } else {
1306 r = vop_write_dirent(&error, uio,
1307 ip->obj_id, DT_DIR, 2, "..");
1308 }
1309 if (r)
1310 goto done;
1311 if (cookies)
1312 cookies[cookie_index] = saveoff;
1313 ++saveoff;
1314 ++cookie_index;
1315 if (cookie_index == ncookies)
1316 goto done;
1317 }
1318
1319 /*
1320 * Key range (begin and end inclusive) to scan. Directory keys
1321 * directly translate to a 64 bit 'seek' position.
1322 */
1323 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1324 cursor.key_beg.localization = ip->obj_localization +
1325 HAMMER_LOCALIZE_MISC;
1326 cursor.key_beg.obj_id = ip->obj_id;
1327 cursor.key_beg.create_tid = 0;
1328 cursor.key_beg.delete_tid = 0;
1329 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1330 cursor.key_beg.obj_type = 0;
1331 cursor.key_beg.key = saveoff;
1332
1333 cursor.key_end = cursor.key_beg;
1334 cursor.key_end.key = HAMMER_MAX_KEY;
1335 cursor.asof = ip->obj_asof;
1336 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1337
1338 error = hammer_ip_first(&cursor);
1339
1340 while (error == 0) {
1341 error = hammer_ip_resolve_data(&cursor);
1342 if (error)
1343 break;
1344 base = &cursor.leaf->base;
1345 saveoff = base->key;
1346 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF);
1347
1348 if (base->obj_id != ip->obj_id)
1349 panic("readdir: bad record at %p", cursor.node);
1350
1351 /*
1352 * Convert pseudo-filesystems into softlinks
1353 */
1354 dtype = hammer_get_dtype(cursor.leaf->base.obj_type);
1355 r = vop_write_dirent(
1356 &error, uio, cursor.data->entry.obj_id,
1357 dtype,
1358 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF ,
1359 (void *)cursor.data->entry.name);
1360 if (r)
1361 break;
1362 ++saveoff;
1363 if (cookies)
1364 cookies[cookie_index] = base->key;
1365 ++cookie_index;
1366 if (cookie_index == ncookies)
1367 break;
1368 error = hammer_ip_next(&cursor);
1369 }
1370 hammer_done_cursor(&cursor);
1371
1372 done:
1373 hammer_done_transaction(&trans);
1374
1375 if (ap->a_eofflag)
1376 *ap->a_eofflag = (error == ENOENT);
1377 uio->uio_offset = saveoff;
1378 if (error && cookie_index == 0) {
1379 if (error == ENOENT)
1380 error = 0;
1381 if (cookies) {
1382 kfree(cookies, M_TEMP);
1383 *ap->a_ncookies = 0;
1384 *ap->a_cookies = NULL;
1385 }
1386 } else {
1387 if (error == ENOENT)
1388 error = 0;
1389 if (cookies) {
1390 *ap->a_ncookies = cookie_index;
1391 *ap->a_cookies = cookies;
1392 }
1393 }
1394 return(error);
1395 }
1396
1397 /*
1398 * hammer_vop_readlink { vp, uio, cred }
1399 */
1400 static
1401 int
1402 hammer_vop_readlink(struct vop_readlink_args *ap)
1403 {
1404 struct hammer_transaction trans;
1405 struct hammer_cursor cursor;
1406 struct hammer_inode *ip;
1407 char buf[32];
1408 u_int32_t localization;
1409 hammer_pseudofs_inmem_t pfsm;
1410 int error;
1411
1412 ip = VTOI(ap->a_vp);
1413
1414 /*
1415 * Shortcut if the symlink data was stuffed into ino_data.
1416 *
1417 * Also expand special "@@PFS%05d" softlinks (expansion only
1418 * occurs for non-historical (current) accesses made from the
1419 * primary filesystem).
1420 */
1421 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) {
1422 char *ptr;
1423 int bytes;
1424
1425 ptr = ip->ino_data.ext.symlink;
1426 bytes = (int)ip->ino_data.size;
1427 if (bytes == 10 &&
1428 ip->obj_asof == HAMMER_MAX_TID &&
1429 ip->obj_localization == 0 &&
1430 strncmp(ptr, "@@PFS", 5) == 0) {
1431 hammer_simple_transaction(&trans, ip->hmp);
1432 bcopy(ptr + 5, buf, 5);
1433 buf[5] = 0;
1434 localization = strtoul(buf, NULL, 10) << 16;
1435 pfsm = hammer_load_pseudofs(&trans, localization,
1436 &error);
1437 if (error == 0) {
1438 if (pfsm->pfsd.mirror_flags &
1439 HAMMER_PFSD_SLAVE) {
1440 ksnprintf(buf, sizeof(buf),
1441 "@@0x%016llx:%05d",
1442 pfsm->pfsd.sync_end_tid,
1443 localization >> 16);
1444 } else {
1445 ksnprintf(buf, sizeof(buf),
1446 "@@0x%016llx:%05d",
1447 HAMMER_MAX_TID,
1448 localization >> 16);
1449 }
1450 ptr = buf;
1451 bytes = strlen(buf);
1452 }
1453 if (pfsm)
1454 hammer_rel_pseudofs(trans.hmp, pfsm);
1455 hammer_done_transaction(&trans);
1456 }
1457 error = uiomove(ptr, bytes, ap->a_uio);
1458 return(error);
1459 }
1460
1461 /*
1462 * Long version
1463 */
1464 hammer_simple_transaction(&trans, ip->hmp);
1465 ++hammer_stats_file_iopsr;
1466 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1467
1468 /*
1469 * Key range (begin and end inclusive) to scan. Directory keys
1470 * directly translate to a 64 bit 'seek' position.
1471 */
1472 cursor.key_beg.localization = ip->obj_localization +
1473 HAMMER_LOCALIZE_MISC;
1474 cursor.key_beg.obj_id = ip->obj_id;
1475 cursor.key_beg.create_tid = 0;
1476 cursor.key_beg.delete_tid = 0;
1477 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1478 cursor.key_beg.obj_type = 0;
1479 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1480 cursor.asof = ip->obj_asof;
1481 cursor.flags |= HAMMER_CURSOR_ASOF;
1482
1483 error = hammer_ip_lookup(&cursor);
1484 if (error == 0) {
1485 error = hammer_ip_resolve_data(&cursor);
1486 if (error == 0) {
1487 KKASSERT(cursor.leaf->data_len >=
1488 HAMMER_SYMLINK_NAME_OFF);
1489 error = uiomove(cursor.data->symlink.name,
1490 cursor.leaf->data_len -
1491 HAMMER_SYMLINK_NAME_OFF,
1492 ap->a_uio);
1493 }
1494 }
1495 hammer_done_cursor(&cursor);
1496 hammer_done_transaction(&trans);
1497 return(error);
1498 }
1499
1500 /*
1501 * hammer_vop_nremove { nch, dvp, cred }
1502 */
1503 static
1504 int
1505 hammer_vop_nremove(struct vop_nremove_args *ap)
1506 {
1507 struct hammer_transaction trans;
1508 struct hammer_inode *dip;
1509 int error;
1510
1511 dip = VTOI(ap->a_dvp);
1512
1513 if (hammer_nohistory(dip) == 0 &&
1514 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1515 return (error);
1516 }
1517
1518 hammer_start_transaction(&trans, dip->hmp);
1519 ++hammer_stats_file_iopsw;
1520 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0);
1521 hammer_done_transaction(&trans);
1522 if (error == 0)
1523 hammer_knote(ap->a_dvp, NOTE_WRITE);
1524 return (error);
1525 }
1526
1527 /*
1528 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1529 */
1530 static
1531 int
1532 hammer_vop_nrename(struct vop_nrename_args *ap)
1533 {
1534 struct hammer_transaction trans;
1535 struct namecache *fncp;
1536 struct namecache *tncp;
1537 struct hammer_inode *fdip;
1538 struct hammer_inode *tdip;
1539 struct hammer_inode *ip;
1540 struct hammer_cursor cursor;
1541 int64_t namekey;
1542 u_int32_t max_iterations;
1543 int nlen, error;
1544
1545 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount)
1546 return(EXDEV);
1547 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
1548 return(EXDEV);
1549
1550 fdip = VTOI(ap->a_fdvp);
1551 tdip = VTOI(ap->a_tdvp);
1552 fncp = ap->a_fnch->ncp;
1553 tncp = ap->a_tnch->ncp;
1554 ip = VTOI(fncp->nc_vp);
1555 KKASSERT(ip != NULL);
1556
1557 if (fdip->obj_localization != tdip->obj_localization)
1558 return(EXDEV);
1559 if (fdip->obj_localization != ip->obj_localization)
1560 return(EXDEV);
1561
1562 if (fdip->flags & HAMMER_INODE_RO)
1563 return (EROFS);
1564 if (tdip->flags & HAMMER_INODE_RO)
1565 return (EROFS);
1566 if (ip->flags & HAMMER_INODE_RO)
1567 return (EROFS);
1568 if ((error = hammer_checkspace(fdip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1569 return (error);
1570
1571 hammer_start_transaction(&trans, fdip->hmp);
1572 ++hammer_stats_file_iopsw;
1573
1574 /*
1575 * Remove tncp from the target directory and then link ip as
1576 * tncp. XXX pass trans to dounlink
1577 *
1578 * Force the inode sync-time to match the transaction so it is
1579 * in-sync with the creation of the target directory entry.
1580 */
1581 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp,
1582 ap->a_cred, 0, -1);
1583 if (error == 0 || error == ENOENT) {
1584 error = hammer_ip_add_directory(&trans, tdip,
1585 tncp->nc_name, tncp->nc_nlen,
1586 ip);
1587 if (error == 0) {
1588 ip->ino_data.parent_obj_id = tdip->obj_id;
1589 hammer_modify_inode(ip, HAMMER_INODE_DDIRTY);
1590 }
1591 }
1592 if (error)
1593 goto failed; /* XXX */
1594
1595 /*
1596 * Locate the record in the originating directory and remove it.
1597 *
1598 * Calculate the namekey and setup the key range for the scan. This
1599 * works kinda like a chained hash table where the lower 32 bits
1600 * of the namekey synthesize the chain.
1601 *
1602 * The key range is inclusive of both key_beg and key_end.
1603 */
1604 namekey = hammer_directory_namekey(fdip, fncp->nc_name, fncp->nc_nlen,
1605 &max_iterations);
1606 retry:
1607 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip);
1608 cursor.key_beg.localization = fdip->obj_localization +
1609 HAMMER_LOCALIZE_MISC;
1610 cursor.key_beg.obj_id = fdip->obj_id;
1611 cursor.key_beg.key = namekey;
1612 cursor.key_beg.create_tid = 0;
1613 cursor.key_beg.delete_tid = 0;
1614 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1615 cursor.key_beg.obj_type = 0;
1616
1617 cursor.key_end = cursor.key_beg;
1618 cursor.key_end.key += max_iterations;
1619 cursor.asof = fdip->obj_asof;
1620 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1621
1622 /*
1623 * Scan all matching records (the chain), locate the one matching
1624 * the requested path component.
1625 *
1626 * The hammer_ip_*() functions merge in-memory records with on-disk
1627 * records for the purposes of the search.
1628 */
1629 error = hammer_ip_first(&cursor);
1630 while (error == 0) {
1631 if (hammer_ip_resolve_data(&cursor) != 0)
1632 break;
1633 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
1634 KKASSERT(nlen > 0);
1635 if (fncp->nc_nlen == nlen &&
1636 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) {
1637 break;
1638 }
1639 error = hammer_ip_next(&cursor);
1640 }
1641
1642 /*
1643 * If all is ok we have to get the inode so we can adjust nlinks.
1644 *
1645 * WARNING: hammer_ip_del_directory() may have to terminate the
1646 * cursor to avoid a recursion. It's ok to call hammer_done_cursor()
1647 * twice.
1648 */
1649 if (error == 0)
1650 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
1651
1652 /*
1653 * XXX A deadlock here will break rename's atomicy for the purposes
1654 * of crash recovery.
1655 */
1656 if (error == EDEADLK) {
1657 hammer_done_cursor(&cursor);
1658 goto retry;
1659 }
1660
1661 /*
1662 * Cleanup and tell the kernel that the rename succeeded.
1663 */
1664 hammer_done_cursor(&cursor);
1665 if (error == 0) {
1666 cache_rename(ap->a_fnch, ap->a_tnch);
1667 hammer_knote(ap->a_fdvp, NOTE_WRITE);
1668 hammer_knote(ap->a_tdvp, NOTE_WRITE);
1669 if (ip->vp)
1670 hammer_knote(ip->vp, NOTE_RENAME);
1671 }
1672
1673 failed:
1674 hammer_done_transaction(&trans);
1675 return (error);
1676 }
1677
1678 /*
1679 * hammer_vop_nrmdir { nch, dvp, cred }
1680 */
1681 static
1682 int
1683 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
1684 {
1685 struct hammer_transaction trans;
1686 struct hammer_inode *dip;
1687 int error;
1688
1689 dip = VTOI(ap->a_dvp);
1690
1691 if (hammer_nohistory(dip) == 0 &&
1692 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1693 return (error);
1694 }
1695
1696 hammer_start_transaction(&trans, dip->hmp);
1697 ++hammer_stats_file_iopsw;
1698 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1);
1699 hammer_done_transaction(&trans);
1700 if (error == 0)
1701 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1702 return (error);
1703 }
1704
1705 /*
1706 * hammer_vop_setattr { vp, vap, cred }
1707 */
1708 static
1709 int
1710 hammer_vop_setattr(struct vop_setattr_args *ap)
1711 {
1712 struct hammer_transaction trans;
1713 struct vattr *vap;
1714 struct hammer_inode *ip;
1715 int modflags;
1716 int error;
1717 int truncating;
1718 int blksize;
1719 int kflags;
1720 int64_t aligned_size;
1721 u_int32_t flags;
1722
1723 vap = ap->a_vap;
1724 ip = ap->a_vp->v_data;
1725 modflags = 0;
1726 kflags = 0;
1727
1728 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1729 return(EROFS);
1730 if (ip->flags & HAMMER_INODE_RO)
1731 return (EROFS);
1732 if (hammer_nohistory(ip) == 0 &&
1733 (error = hammer_checkspace(ip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1734 return (error);
1735 }
1736
1737 hammer_start_transaction(&trans, ip->hmp);
1738 ++hammer_stats_file_iopsw;
1739 error = 0;
1740
1741 if (vap->va_flags != VNOVAL) {
1742 flags = ip->ino_data.uflags;
1743 error = vop_helper_setattr_flags(&flags, vap->va_flags,
1744 hammer_to_unix_xid(&ip->ino_data.uid),
1745 ap->a_cred);
1746 if (error == 0) {
1747 if (ip->ino_data.uflags != flags) {
1748 ip->ino_data.uflags = flags;
1749 modflags |= HAMMER_INODE_DDIRTY;
1750 kflags |= NOTE_ATTRIB;
1751 }
1752 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1753 error = 0;
1754 goto done;
1755 }
1756 }
1757 goto done;
1758 }
1759 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
1760 error = EPERM;
1761 goto done;
1762 }
1763 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
1764 mode_t cur_mode = ip->ino_data.mode;
1765 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
1766 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1767 uuid_t uuid_uid;
1768 uuid_t uuid_gid;
1769
1770 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
1771 ap->a_cred,
1772 &cur_uid, &cur_gid, &cur_mode);
1773 if (error == 0) {
1774 hammer_guid_to_uuid(&uuid_uid, cur_uid);
1775 hammer_guid_to_uuid(&uuid_gid, cur_gid);
1776 if (bcmp(&uuid_uid, &ip->ino_data.uid,
1777 sizeof(uuid_uid)) ||
1778 bcmp(&uuid_gid, &ip->ino_data.gid,
1779 sizeof(uuid_gid)) ||
1780 ip->ino_data.mode != cur_mode
1781 ) {
1782 ip->ino_data.uid = uuid_uid;
1783 ip->ino_data.gid = uuid_gid;
1784 ip->ino_data.mode = cur_mode;
1785 }
1786 modflags |= HAMMER_INODE_DDIRTY;
1787 kflags |= NOTE_ATTRIB;
1788 }
1789 }
1790 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) {
1791 switch(ap->a_vp->v_type) {
1792 case VREG:
1793 if (vap->va_size == ip->ino_data.size)
1794 break;
1795 /*
1796 * XXX break atomicy, we can deadlock the backend
1797 * if we do not release the lock. Probably not a
1798 * big deal here.
1799 */
1800 blksize = hammer_blocksize(vap->va_size);
1801 if (vap->va_size < ip->ino_data.size) {
1802 vtruncbuf(ap->a_vp, vap->va_size, blksize);
1803 truncating = 1;
1804 kflags |= NOTE_WRITE;
1805 } else {
1806 vnode_pager_setsize(ap->a_vp, vap->va_size);
1807 truncating = 0;
1808 kflags |= NOTE_WRITE | NOTE_EXTEND;
1809 }
1810 ip->ino_data.size = vap->va_size;
1811 modflags |= HAMMER_INODE_DDIRTY;
1812
1813 /*
1814 * on-media truncation is cached in the inode until
1815 * the inode is synchronized.
1816 */
1817 if (truncating) {
1818 hammer_ip_frontend_trunc(ip, vap->va_size);
1819 #ifdef DEBUG_TRUNCATE
1820 if (HammerTruncIp == NULL)
1821 HammerTruncIp = ip;
1822 #endif
1823 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
1824 ip->flags |= HAMMER_INODE_TRUNCATED;
1825 ip->trunc_off = vap->va_size;
1826 #ifdef DEBUG_TRUNCATE
1827 if (ip == HammerTruncIp)
1828 kprintf("truncate1 %016llx\n", ip->trunc_off);
1829 #endif
1830 } else if (ip->trunc_off > vap->va_size) {
1831 ip->trunc_off = vap->va_size;
1832 #ifdef DEBUG_TRUNCATE
1833 if (ip == HammerTruncIp)
1834 kprintf("truncate2 %016llx\n", ip->trunc_off);
1835 #endif
1836 } else {
1837 #ifdef DEBUG_TRUNCATE
1838 if (ip == HammerTruncIp)
1839 kprintf("truncate3 %016llx (ignored)\n", vap->va_size);
1840 #endif
1841 }
1842 }
1843
1844 /*
1845 * If truncating we have to clean out a portion of
1846 * the last block on-disk. We do this in the
1847 * front-end buffer cache.
1848 */
1849 aligned_size = (vap->va_size + (blksize - 1)) &
1850 ~(int64_t)(blksize - 1);
1851 if (truncating && vap->va_size < aligned_size) {
1852 struct buf *bp;
1853 int offset;
1854
1855 aligned_size -= blksize;
1856
1857 offset = (int)vap->va_size & (blksize - 1);
1858 error = bread(ap->a_vp, aligned_size,
1859 blksize, &bp);
1860 hammer_ip_frontend_trunc(ip, aligned_size);
1861 if (error == 0) {
1862 bzero(bp->b_data + offset,
1863 blksize - offset);
1864 /* must de-cache direct-io offset */
1865 bp->b_bio2.bio_offset = NOOFFSET;
1866 bdwrite(bp);
1867 } else {
1868 kprintf("ERROR %d\n", error);
1869 brelse(bp);
1870 }
1871 }
1872 break;
1873 case VDATABASE:
1874 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
1875 ip->flags |= HAMMER_INODE_TRUNCATED;
1876 ip->trunc_off = vap->va_size;
1877 } else if (ip->trunc_off > vap->va_size) {
1878 ip->trunc_off = vap->va_size;
1879 }
1880 hammer_ip_frontend_trunc(ip, vap->va_size);
1881 ip->ino_data.size = vap->va_size;
1882 modflags |= HAMMER_INODE_DDIRTY;
1883 kflags |= NOTE_ATTRIB;
1884 break;
1885 default:
1886 error = EINVAL;
1887 goto done;
1888 }
1889 break;
1890 }
1891 if (vap->va_atime.tv_sec != VNOVAL) {
1892 ip->ino_data.atime =
1893 hammer_timespec_to_time(&vap->va_atime);
1894 modflags |= HAMMER_INODE_ATIME;
1895 kflags |= NOTE_ATTRIB;
1896 }
1897 if (vap->va_mtime.tv_sec != VNOVAL) {
1898 ip->ino_data.mtime =
1899 hammer_timespec_to_time(&vap->va_mtime);
1900 modflags |= HAMMER_INODE_MTIME;
1901 kflags |= NOTE_ATTRIB;
1902 }
1903 if (vap->va_mode != (mode_t)VNOVAL) {
1904 mode_t cur_mode = ip->ino_data.mode;
1905 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
1906 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1907
1908 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
1909 cur_uid, cur_gid, &cur_mode);
1910 if (error == 0 && ip->ino_data.mode != cur_mode) {
1911 ip->ino_data.mode = cur_mode;
1912 modflags |= HAMMER_INODE_DDIRTY;
1913 kflags |= NOTE_ATTRIB;
1914 }
1915 }
1916 done:
1917 if (error == 0)
1918 hammer_modify_inode(ip, modflags);
1919 hammer_done_transaction(&trans);
1920 hammer_knote(ap->a_vp, kflags);
1921 return (error);
1922 }
1923
1924 /*
1925 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
1926 */
1927 static
1928 int
1929 hammer_vop_nsymlink(struct vop_nsymlink_args *ap)
1930 {
1931 struct hammer_transaction trans;
1932 struct hammer_inode *dip;
1933 struct hammer_inode *nip;
1934 struct nchandle *nch;
1935 hammer_record_t record;
1936 int error;
1937 int bytes;
1938
1939 ap->a_vap->va_type = VLNK;
1940
1941 nch = ap->a_nch;
1942 dip = VTOI(ap->a_dvp);
1943
1944 if (dip->flags & HAMMER_INODE_RO)
1945 return (EROFS);
1946 if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0)
1947 return (error);
1948
1949 /*
1950 * Create a transaction to cover the operations we perform.
1951 */
1952 hammer_start_transaction(&trans, dip->hmp);
1953 ++hammer_stats_file_iopsw;
1954
1955 /*
1956 * Create a new filesystem object of the requested type. The
1957 * returned inode will be referenced but not locked.
1958 */
1959
1960 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1961 dip, NULL, &nip);
1962 if (error) {
1963 hammer_done_transaction(&trans);
1964 *ap->a_vpp = NULL;
1965 return (error);
1966 }
1967
1968 /*
1969 * Add a record representing the symlink. symlink stores the link
1970 * as pure data, not a string, and is no \0 terminated.
1971 */
1972 if (error == 0) {
1973 bytes = strlen(ap->a_target);
1974
1975 if (bytes <= HAMMER_INODE_BASESYMLEN) {
1976 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes);
1977 } else {
1978 record = hammer_alloc_mem_record(nip, bytes);
1979 record->type = HAMMER_MEM_RECORD_GENERAL;
1980
1981 record->leaf.base.localization = nip->obj_localization +
1982 HAMMER_LOCALIZE_MISC;
1983 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK;
1984 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX;
1985 record->leaf.data_len = bytes;
1986 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0);
1987 bcopy(ap->a_target, record->data->symlink.name, bytes);
1988 error = hammer_ip_add_record(&trans, record);
1989 }
1990
1991 /*
1992 * Set the file size to the length of the link.
1993 */
1994 if (error == 0) {
1995 nip->ino_data.size = bytes;
1996 hammer_modify_inode(nip, HAMMER_INODE_DDIRTY);
1997 }
1998 }
1999 if (error == 0)
2000 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name,
2001 nch->ncp->nc_nlen, nip);
2002
2003 /*
2004 * Finish up.
2005 */
2006 if (error) {
2007 hammer_rel_inode(nip, 0);
2008 *ap->a_vpp = NULL;
2009 } else {
2010 error = hammer_get_vnode(nip, ap->a_vpp);
2011 hammer_rel_inode(nip, 0);
2012 if (error == 0) {
2013 cache_setunresolved(ap->a_nch);
2014 cache_setvp(ap->a_nch, *ap->a_vpp);
2015 hammer_knote(ap->a_dvp, NOTE_WRITE);
2016 }
2017 }
2018 hammer_done_transaction(&trans);
2019 return (error);
2020 }
2021
2022 /*
2023 * hammer_vop_nwhiteout { nch, dvp, cred, flags }
2024 */
2025 static
2026 int
2027 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap)
2028 {
2029 struct hammer_transaction trans;
2030 struct hammer_inode *dip;
2031 int error;
2032
2033 dip = VTOI(ap->a_dvp);
2034
2035 if (hammer_nohistory(dip) == 0 &&
2036 (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) {
2037 return (error);
2038 }
2039
2040 hammer_start_transaction(&trans, dip->hmp);
2041 ++hammer_stats_file_iopsw;
2042 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp,
2043 ap->a_cred, ap->a_flags, -1);
2044 hammer_done_transaction(&trans);
2045
2046 return (error);
2047 }
2048
2049 /*
2050 * hammer_vop_ioctl { vp, command, data, fflag, cred }
2051 */
2052 static
2053 int
2054 hammer_vop_ioctl(struct vop_ioctl_args *ap)
2055 {
2056 struct hammer_inode *ip = ap->a_vp->v_data;
2057
2058 ++hammer_stats_file_iopsr;
2059 return(hammer_ioctl(ip, ap->a_command, ap->a_data,
2060 ap->a_fflag, ap->a_cred));
2061 }
2062
2063 static
2064 int
2065 hammer_vop_mountctl(struct vop_mountctl_args *ap)
2066 {
2067 struct mount *mp;
2068 int error;
2069
2070 mp = ap->a_head.a_ops->head.vv_mount;
2071
2072 switch(ap->a_op) {
2073 case MOUNTCTL_SET_EXPORT:
2074 if (ap->a_ctllen != sizeof(struct export_args))
2075 error = EINVAL;
2076 else
2077 error = hammer_vfs_export(mp, ap->a_op,
2078 (const struct export_args *)ap->a_ctl);
2079 break;
2080 default:
2081 error = journal_mountctl(ap);
2082 break;
2083 }
2084 return(error);
2085 }
2086
2087 /*
2088 * hammer_vop_strategy { vp, bio }
2089 *
2090 * Strategy call, used for regular file read & write only. Note that the
2091 * bp may represent a cluster.
2092 *
2093 * To simplify operation and allow better optimizations in the future,
2094 * this code does not make any assumptions with regards to buffer alignment
2095 * or size.
2096 */
2097 static
2098 int
2099 hammer_vop_strategy(struct vop_strategy_args *ap)
2100 {
2101 struct buf *bp;
2102 int error;
2103
2104 bp = ap->a_bio->bio_buf;
2105
2106 switch(bp->b_cmd) {
2107 case BUF_CMD_READ:
2108 error = hammer_vop_strategy_read(ap);
2109 break;
2110 case BUF_CMD_WRITE:
2111 error = hammer_vop_strategy_write(ap);
2112 break;
2113 default:
2114 bp->b_error = error = EINVAL;
2115 bp->b_flags |= B_ERROR;
2116 biodone(ap->a_bio);
2117 break;
2118 }
2119 return (error);
2120 }
2121
2122 /*
2123 * Read from a regular file. Iterate the related records and fill in the
2124 * BIO/BUF. Gaps are zero-filled.
2125 *
2126 * The support code in hammer_object.c should be used to deal with mixed
2127 * in-memory and on-disk records.
2128 *
2129 * NOTE: Can be called from the cluster code with an oversized buf.
2130 *
2131 * XXX atime update
2132 */
2133 static
2134 int
2135 hammer_vop_strategy_read(struct vop_strategy_args *ap)
2136 {
2137 struct hammer_transaction trans;
2138 struct hammer_inode *ip;
2139 struct hammer_cursor cursor;
2140 hammer_base_elm_t base;
2141 hammer_off_t disk_offset;
2142 struct bio *bio;
2143 struct bio *nbio;
2144 struct buf *bp;
2145 int64_t rec_offset;
2146 int64_t ran_end;
2147 int64_t tmp64;
2148 int error;
2149 int boff;
2150 int roff;
2151 int n;
2152
2153 bio = ap->a_bio;
2154 bp = bio->bio_buf;
2155 ip = ap->a_vp->v_data;
2156
2157 /*
2158 * The zone-2 disk offset may have been set by the cluster code via
2159 * a BMAP operation, or else should be NOOFFSET.
2160 *
2161 * Checking the high bits for a match against zone-2 should suffice.
2162 */
2163 nbio = push_bio(bio);
2164 if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) ==
2165 HAMMER_ZONE_LARGE_DATA) {
2166 error = hammer_io_direct_read(ip->hmp, nbio, NULL);
2167 return (error);
2168 }
2169
2170 /*
2171 * Well, that sucked. Do it the hard way. If all the stars are
2172 * aligned we may still be able to issue a direct-read.
2173 */
2174 hammer_simple_transaction(&trans, ip->hmp);
2175 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2176
2177 /*
2178 * Key range (begin and end inclusive) to scan. Note that the key's
2179 * stored in the actual records represent BASE+LEN, not BASE. The
2180 * first record containing bio_offset will have a key > bio_offset.
2181 */
2182 cursor.key_beg.localization = ip->obj_localization +
2183 HAMMER_LOCALIZE_MISC;
2184 cursor.key_beg.obj_id = ip->obj_id;
2185 cursor.key_beg.create_tid = 0;
2186 cursor.key_beg.delete_tid = 0;
2187 cursor.key_beg.obj_type = 0;
2188 cursor.key_beg.key = bio->bio_offset + 1;
2189 cursor.asof = ip->obj_asof;
2190 cursor.flags |= HAMMER_CURSOR_ASOF;
2191
2192 cursor.key_end = cursor.key_beg;
2193 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2194 #if 0
2195 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) {
2196 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
2197 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
2198 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2199 } else
2200 #endif
2201 {
2202 ran_end = bio->bio_offset + bp->b_bufsize;
2203 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2204 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2205 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2206 if (tmp64 < ran_end)
2207 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2208 else
2209 cursor.key_end.key = ran_end + MAXPHYS + 1;
2210 }
2211 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2212
2213 error = hammer_ip_first(&cursor);
2214 boff = 0;
2215
2216 while (error == 0) {
2217 /*
2218 * Get the base file offset of the record. The key for
2219 * data records is (base + bytes) rather then (base).
2220 */
2221 base = &cursor.leaf->base;
2222 rec_offset = base->key - cursor.leaf->data_len;
2223
2224 /*
2225 * Calculate the gap, if any, and zero-fill it.
2226 *
2227 * n is the offset of the start of the record verses our
2228 * current seek offset in the bio.
2229 */
2230 n = (int)(rec_offset - (bio->bio_offset + boff));
2231 if (n > 0) {
2232 if (n > bp->b_bufsize - boff)
2233 n = bp->b_bufsize - boff;
2234 bzero((char *)bp->b_data + boff, n);
2235 boff += n;
2236 n = 0;
2237 }
2238
2239 /*
2240 * Calculate the data offset in the record and the number
2241 * of bytes we can copy.
2242 *
2243 * There are two degenerate cases. First, boff may already
2244 * be at bp->b_bufsize. Secondly, the data offset within
2245 * the record may exceed the record's size.
2246 */
2247 roff = -n;
2248 rec_offset += roff;
2249 n = cursor.leaf->data_len - roff;
2250 if (n <= 0) {
2251 kprintf("strategy_read: bad n=%d roff=%d\n", n, roff);
2252 n = 0;
2253 } else if (n > bp->b_bufsize - boff) {
2254 n = bp->b_bufsize - boff;
2255 }
2256
2257 /*
2258 * Deal with cached truncations. This cool bit of code
2259 * allows truncate()/ftruncate() to avoid having to sync
2260 * the file.
2261 *
2262 * If the frontend is truncated then all backend records are
2263 * subject to the frontend's truncation.
2264 *
2265 * If the backend is truncated then backend records on-disk
2266 * (but not in-memory) are subject to the backend's
2267 * truncation. In-memory records owned by the backend
2268 * represent data written after the truncation point on the
2269 * backend and must not be truncated.
2270 *
2271 * Truncate operations deal with frontend buffer cache
2272 * buffers and frontend-owned in-memory records synchronously.
2273 */
2274 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2275 if (hammer_cursor_ondisk(&cursor) ||
2276 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2277 if (ip->trunc_off <= rec_offset)
2278 n = 0;
2279 else if (ip->trunc_off < rec_offset + n)
2280 n = (int)(ip->trunc_off - rec_offset);
2281 }
2282 }
2283 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2284 if (hammer_cursor_ondisk(&cursor)) {
2285 if (ip->sync_trunc_off <= rec_offset)
2286 n = 0;
2287 else if (ip->sync_trunc_off < rec_offset + n)
2288 n = (int)(ip->sync_trunc_off - rec_offset);
2289 }
2290 }
2291
2292 /*
2293 * Try to issue a direct read into our bio if possible,
2294 * otherwise resolve the element data into a hammer_buffer
2295 * and copy.
2296 *
2297 * The buffer on-disk should be zerod past any real
2298 * truncation point, but may not be for any synthesized
2299 * truncation point from above.
2300 */
2301 disk_offset = cursor.leaf->data_offset + roff;
2302 if (boff == 0 && n == bp->b_bufsize &&
2303 hammer_cursor_ondisk(&cursor) &&
2304 (disk_offset & HAMMER_BUFMASK) == 0) {
2305 KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) ==
2306 HAMMER_ZONE_LARGE_DATA);
2307 nbio->bio_offset = disk_offset;
2308 error = hammer_io_direct_read(trans.hmp, nbio,
2309 cursor.leaf);
2310 goto done;
2311 } else if (n) {
2312 error = hammer_ip_resolve_data(&cursor);
2313 if (error == 0) {
2314 bcopy((char *)cursor.data + roff,
2315 (char *)bp->b_data + boff, n);
2316 }
2317 }
2318 if (error)
2319 break;
2320
2321 /*
2322 * Iterate until we have filled the request.
2323 */
2324 boff += n;
2325 if (boff == bp->b_bufsize)
2326 break;
2327 error = hammer_ip_next(&cursor);
2328 }
2329
2330 /*
2331 * There may have been a gap after the last record
2332 */
2333 if (error == ENOENT)
2334 error = 0;
2335 if (error == 0 && boff != bp->b_bufsize) {
2336 KKASSERT(boff < bp->b_bufsize);
2337 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
2338 /* boff = bp->b_bufsize; */
2339 }
2340 bp->b_resid = 0;
2341 bp->b_error = error;
2342 if (error)
2343 bp->b_flags |= B_ERROR;
2344 biodone(ap->a_bio);
2345
2346 done:
2347 if (cursor.node)
2348 hammer_cache_node(&ip->cache[1], cursor.node);
2349 hammer_done_cursor(&cursor);
2350 hammer_done_transaction(&trans);
2351 return(error);
2352 }
2353
2354 /*
2355 * BMAP operation - used to support cluster_read() only.
2356 *
2357 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb)
2358 *
2359 * This routine may return EOPNOTSUPP if the opration is not supported for
2360 * the specified offset. The contents of the pointer arguments do not
2361 * need to be initialized in that case.
2362 *
2363 * If a disk address is available and properly aligned return 0 with
2364 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately
2365 * to the run-length relative to that offset. Callers may assume that
2366 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently
2367 * large, so return EOPNOTSUPP if it is not sufficiently large.
2368 */
2369 static
2370 int
2371 hammer_vop_bmap(struct vop_bmap_args *ap)
2372 {
2373 struct hammer_transaction trans;
2374 struct hammer_inode *ip;
2375 struct hammer_cursor cursor;
2376 hammer_base_elm_t base;
2377 int64_t rec_offset;
2378 int64_t ran_end;
2379 int64_t tmp64;
2380 int64_t base_offset;
2381 int64_t base_disk_offset;
2382 int64_t last_offset;
2383 hammer_off_t last_disk_offset;
2384 hammer_off_t disk_offset;
2385 int rec_len;
2386 int error;
2387 int blksize;
2388
2389 ++hammer_stats_file_iopsr;
2390 ip = ap->a_vp->v_data;
2391
2392 /*
2393 * We can only BMAP regular files. We can't BMAP database files,
2394 * directories, etc.
2395 */
2396 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE)
2397 return(EOPNOTSUPP);
2398
2399 /*
2400 * bmap is typically called with runp/runb both NULL when used
2401 * for writing. We do not support BMAP for writing atm.
2402 */
2403 if (ap->a_cmd != BUF_CMD_READ)
2404 return(EOPNOTSUPP);
2405
2406 /*
2407 * Scan the B-Tree to acquire blockmap addresses, then translate
2408 * to raw addresses.
2409 */
2410 hammer_simple_transaction(&trans, ip->hmp);
2411 #if 0
2412 kprintf("bmap_beg %016llx ip->cache %p\n", ap->a_loffset, ip->cache[1]);
2413 #endif
2414 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2415
2416 /*
2417 * Key range (begin and end inclusive) to scan. Note that the key's
2418 * stored in the actual records represent BASE+LEN, not BASE. The
2419 * first record containing bio_offset will have a key > bio_offset.
2420 */
2421 cursor.key_beg.localization = ip->obj_localization +
2422 HAMMER_LOCALIZE_MISC;
2423 cursor.key_beg.obj_id = ip->obj_id;
2424 cursor.key_beg.create_tid = 0;
2425 cursor.key_beg.delete_tid = 0;
2426 cursor.key_beg.obj_type = 0;
2427 if (ap->a_runb)
2428 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1;
2429 else
2430 cursor.key_beg.key = ap->a_loffset + 1;
2431 if (cursor.key_beg.key < 0)
2432 cursor.key_beg.key = 0;
2433 cursor.asof = ip->obj_asof;
2434 cursor.flags |= HAMMER_CURSOR_ASOF;
2435
2436 cursor.key_end = cursor.key_beg;
2437 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2438
2439 ran_end = ap->a_loffset + MAXPHYS;
2440 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2441 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2442 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2443 if (tmp64 < ran_end)
2444 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2445 else
2446 cursor.key_end.key = ran_end + MAXPHYS + 1;
2447
2448 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2449
2450 error = hammer_ip_first(&cursor);
2451 base_offset = last_offset = 0;
2452 base_disk_offset = last_disk_offset = 0;
2453
2454 while (error == 0) {
2455 /*
2456 * Get the base file offset of the record. The key for
2457 * data records is (base + bytes) rather then (base).
2458 *
2459 * NOTE: rec_offset + rec_len may exceed the end-of-file.
2460 * The extra bytes should be zero on-disk and the BMAP op
2461 * should still be ok.
2462 */
2463 base = &cursor.leaf->base;
2464 rec_offset = base->key - cursor.leaf->data_len;
2465 rec_len = cursor.leaf->data_len;
2466
2467 /*
2468 * Incorporate any cached truncation.
2469 *
2470 * NOTE: Modifications to rec_len based on synthesized
2471 * truncation points remove the guarantee that any extended
2472 * data on disk is zero (since the truncations may not have
2473 * taken place on-media yet).
2474 */
2475 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2476 if (hammer_cursor_ondisk(&cursor) ||
2477 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
2478 if (ip->trunc_off <= rec_offset)
2479 rec_len = 0;
2480 else if (ip->trunc_off < rec_offset + rec_len)
2481 rec_len = (int)(ip->trunc_off - rec_offset);
2482 }
2483 }
2484 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2485 if (hammer_cursor_ondisk(&cursor)) {
2486 if (ip->sync_trunc_off <= rec_offset)
2487 rec_len = 0;
2488 else if (ip->sync_trunc_off < rec_offset + rec_len)
2489 rec_len = (int)(ip->sync_trunc_off - rec_offset);
2490 }
2491 }
2492
2493 /*
2494 * Accumulate information. If we have hit a discontiguous
2495 * block reset base_offset unless we are already beyond the
2496 * requested offset. If we are, that's it, we stop.
2497 */
2498 if (error)
2499 break;
2500 if (hammer_cursor_ondisk(&cursor)) {
2501 disk_offset = cursor.leaf->data_offset;
2502 if (rec_offset != last_offset ||
2503 disk_offset != last_disk_offset) {
2504 if (rec_offset > ap->a_loffset)
2505 break;
2506 base_offset = rec_offset;
2507 base_disk_offset = disk_offset;
2508 }
2509 last_offset = rec_offset + rec_len;
2510 last_disk_offset = disk_offset + rec_len;
2511 }
2512 error = hammer_ip_next(&cursor);
2513 }
2514
2515 #if 0
2516 kprintf("BMAP %016llx: %016llx - %016llx\n",
2517 ap->a_loffset, base_offset, last_offset);
2518 kprintf("BMAP %16s: %016llx - %016llx\n",
2519 "", base_disk_offset, last_disk_offset);
2520 #endif
2521
2522 if (cursor.node) {
2523 hammer_cache_node(&ip->cache[1], cursor.node);
2524 #if 0
2525 kprintf("bmap_end2 %016llx ip->cache %p\n", ap->a_loffset, ip->cache[1]);
2526 #endif
2527 }
2528 hammer_done_cursor(&cursor);
2529 hammer_done_transaction(&trans);
2530
2531 /*
2532 * If we couldn't find any records or the records we did find were
2533 * all behind the requested offset, return failure. A forward
2534 * truncation can leave a hole w/ no on-disk records.
2535 */
2536 if (last_offset == 0 || last_offset < ap->a_loffset)
2537 return (EOPNOTSUPP);
2538
2539 /*
2540 * Figure out the block size at the requested offset and adjust
2541 * our limits so the cluster_read() does not create inappropriately
2542 * sized buffer cache buffers.
2543 */
2544 blksize = hammer_blocksize(ap->a_loffset);
2545 if (hammer_blocksize(base_offset) != blksize) {
2546 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset);
2547 }
2548 if (last_offset != ap->a_loffset &&
2549 hammer_blocksize(last_offset - 1) != blksize) {
2550 last_offset = hammer_blockdemarc(ap->a_loffset,
2551 last_offset - 1);
2552 }
2553
2554 /*
2555 * Returning EOPNOTSUPP simply prevents the direct-IO optimization
2556 * from occuring.
2557 */
2558 disk_offset = base_disk_offset + (ap->a_loffset - base_offset);
2559
2560 if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) {
2561 /*
2562 * Only large-data zones can be direct-IOd
2563 */
2564 error = EOPNOTSUPP;
2565 } else if ((disk_offset & HAMMER_BUFMASK) ||
2566 (last_offset - ap->a_loffset) < blksize) {
2567 /*
2568 * doffsetp is not aligned or the forward run size does
2569 * not cover a whole buffer, disallow the direct I/O.
2570 */
2571 error = EOPNOTSUPP;
2572 } else {
2573 /*
2574 * We're good.
2575 */
2576 *ap->a_doffsetp = disk_offset;
2577 if (ap->a_runb) {
2578 *ap->a_runb = ap->a_loffset - base_offset;
2579 KKASSERT(*ap->a_runb >= 0);
2580 }
2581 if (ap->a_runp) {
2582 *ap->a_runp = last_offset - ap->a_loffset;
2583 KKASSERT(*ap->a_runp >= 0);
2584 }
2585 error = 0;
2586 }
2587 return(error);
2588 }
2589
2590 /*
2591 * Write to a regular file. Because this is a strategy call the OS is
2592 * trying to actually get data onto the media.
2593 */
2594 static
2595 int
2596 hammer_vop_strategy_write(struct vop_strategy_args *ap)
2597 {
2598 hammer_record_t record;
2599 hammer_mount_t hmp;
2600 hammer_inode_t ip;
2601 struct bio *bio;
2602 struct buf *bp;
2603 int blksize;
2604 int bytes;
2605 int error;
2606
2607 bio = ap->a_bio;
2608 bp = bio->bio_buf;
2609 ip = ap->a_vp->v_data;
2610 hmp = ip->hmp;
2611
2612 blksize = hammer_blocksize(bio->bio_offset);
2613 KKASSERT(bp->b_bufsize == blksize);
2614
2615 if (ip->flags & HAMMER_INODE_RO) {
2616 bp->b_error = EROFS;
2617 bp->b_flags |= B_ERROR;
2618 biodone(ap->a_bio);
2619 return(EROFS);
2620 }
2621
2622 /*
2623 * Interlock with inode destruction (no in-kernel or directory
2624 * topology visibility). If we queue new IO while trying to
2625 * destroy the inode we can deadlock the vtrunc call in
2626 * hammer_inode_unloadable_check().
2627 *
2628 * Besides, there's no point flushing a bp associated with an
2629 * inode that is being destroyed on-media and has no kernel
2630 * references.
2631 */
2632 if ((ip->flags | ip->sync_flags) &
2633 (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) {
2634 bp->b_resid = 0;
2635 biodone(ap->a_bio);
2636 return(0);
2637 }
2638
2639 /*
2640 * Reserve space and issue a direct-write from the front-end.
2641 * NOTE: The direct_io code will hammer_bread/bcopy smaller
2642 * allocations.
2643 *
2644 * An in-memory record will be installed to reference the storage
2645 * until the flusher can get to it.
2646 *
2647 * Since we own the high level bio the front-end will not try to
2648 * do a direct-read until the write completes.
2649 *
2650 * NOTE: The only time we do not reserve a full-sized buffers
2651 * worth of data is if the file is small. We do not try to
2652 * allocate a fragment (from the small-data zone) at the end of
2653 * an otherwise large file as this can lead to wildly separated
2654 * data.
2655 */
2656 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0);
2657 KKASSERT(bio->bio_offset < ip->ino_data.size);
2658 if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2)
2659 bytes = bp->b_bufsize;
2660 else
2661 bytes = ((int)ip->ino_data.size + 15) & ~15;
2662
2663 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data,
2664 bytes, &error);
2665 if (record) {
2666 hammer_io_direct_write(hmp, record, bio);
2667 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs)
2668 hammer_flush_inode(ip, 0);
2669 } else {
2670 bp->b_bio2.bio_offset = NOOFFSET;
2671 bp->b_error = error;
2672 bp->b_flags |= B_ERROR;
2673 biodone(ap->a_bio);
2674 }
2675 return(error);
2676 }
2677
2678 /*
2679 * dounlink - disconnect a directory entry
2680 *
2681 * XXX whiteout support not really in yet
2682 */
2683 static int
2684 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
2685 struct vnode *dvp, struct ucred *cred,
2686 int flags, int isdir)
2687 {
2688 struct namecache *ncp;
2689 hammer_inode_t dip;
2690 hammer_inode_t ip;
2691 struct hammer_cursor cursor;
2692 int64_t namekey;
2693 u_int32_t max_iterations;
2694 int nlen, error;
2695
2696 /*
2697 * Calculate the namekey and setup the key range for the scan. This
2698 * works kinda like a chained hash table where the lower 32 bits
2699 * of the namekey synthesize the chain.
2700 *
2701 * The key range is inclusive of both key_beg and key_end.
2702 */
2703 dip = VTOI(dvp);
2704 ncp = nch->ncp;
2705
2706 if (dip->flags & HAMMER_INODE_RO)
2707 return (EROFS);
2708
2709 namekey = hammer_directory_namekey(dip, ncp->nc_name, ncp->nc_nlen,
2710 &max_iterations);
2711 retry:
2712 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip);
2713 cursor.key_beg.localization = dip->obj_localization +
2714 HAMMER_LOCALIZE_MISC;
2715 cursor.key_beg.obj_id = dip->obj_id;
2716 cursor.key_beg.key = namekey;
2717 cursor.key_beg.create_tid = 0;
2718 cursor.key_beg.delete_tid = 0;
2719 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
2720 cursor.key_beg.obj_type = 0;
2721
2722 cursor.key_end = cursor.key_beg;
2723 cursor.key_end.key += max_iterations;
2724 cursor.asof = dip->obj_asof;
2725 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
2726
2727 /*
2728 * Scan all matching records (the chain), locate the one matching
2729 * the requested path component. info->last_error contains the
2730 * error code on search termination and could be 0, ENOENT, or
2731 * something else.
2732 *
2733 * The hammer_ip_*() functions merge in-memory records with on-disk
2734 * records for the purposes of the search.
2735 */
2736 error = hammer_ip_first(&cursor);
2737
2738 while (error == 0) {
2739 error = hammer_ip_resolve_data(&cursor);
2740 if (error)
2741 break;
2742 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
2743 KKASSERT(nlen > 0);
2744 if (ncp->nc_nlen == nlen &&
2745 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
2746 break;
2747 }
2748 error = hammer_ip_next(&cursor);
2749 }
2750
2751 /*
2752 * If all is ok we have to get the inode so we can adjust nlinks.
2753 * To avoid a deadlock with the flusher we must release the inode
2754 * lock on the directory when acquiring the inode for the entry.
2755 *
2756 * If the target is a directory, it must be empty.
2757 */
2758 if (error == 0) {
2759 hammer_unlock(&cursor.ip->lock);
2760 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id,
2761 dip->hmp->asof,
2762 cursor.data->entry.localization,
2763 0, &error);
2764 hammer_lock_sh(&cursor.ip->lock);
2765 if (error == ENOENT) {
2766 kprintf("obj_id %016llx\n", cursor.data->entry.obj_id);
2767 Debugger("ENOENT unlinking object that should exist");
2768 }
2769
2770 /*
2771 * If isdir >= 0 we validate that the entry is or is not a
2772 * directory. If isdir < 0 we don't care.
2773 */
2774 if (error == 0 && isdir >= 0) {
2775 if (isdir &&
2776 ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) {
2777 error = ENOTDIR;
2778 } else if (isdir == 0 &&
2779 ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
2780 error = EISDIR;
2781 }
2782 }
2783
2784 /*
2785 * If we are trying to remove a directory the directory must
2786 * be empty.
2787 *
2788 * WARNING: hammer_ip_check_directory_empty() may have to
2789 * terminate the cursor to avoid a deadlock. It is ok to
2790 * call hammer_done_cursor() twice.
2791 */
2792 if (error == 0 && ip->ino_data.obj_type ==
2793 HAMMER_OBJTYPE_DIRECTORY) {
2794 error = hammer_ip_check_directory_empty(trans, ip);
2795 }
2796
2797 /*
2798 * Delete the directory entry.
2799 *
2800 * WARNING: hammer_ip_del_directory() may have to terminate
2801 * the cursor to avoid a deadlock. It is ok to call
2802 * hammer_done_cursor() twice.
2803 */
2804 if (error == 0) {
2805 error = hammer_ip_del_directory(trans, &cursor,
2806 dip, ip);
2807 }
2808 hammer_done_cursor(&cursor);
2809 if (error == 0) {
2810 cache_setunresolved(nch);
2811 cache_setvp(nch, NULL);
2812 /* XXX locking */
2813 if (ip->vp) {
2814 hammer_knote(ip->vp, NOTE_DELETE);
2815 cache_inval_vp(ip->vp, CINV_DESTROY);
2816 }
2817 }
2818 if (ip)
2819 hammer_rel_inode(ip, 0);
2820 } else {
2821 hammer_done_cursor(&cursor);
2822 }
2823 if (error == EDEADLK)
2824 goto retry;
2825
2826 return (error);
2827 }
2828
2829 /************************************************************************
2830 * FIFO AND SPECFS OPS *
2831 ************************************************************************
2832 *
2833 */
2834
2835 static int
2836 hammer_vop_fifoclose (struct vop_close_args *ap)
2837 {
2838 /* XXX update itimes */
2839 return (VOCALL(&fifo_vnode_vops, &ap->a_head));
2840 }
2841
2842 static int
2843 hammer_vop_fiforead (struct vop_read_args *ap)
2844 {
2845 int error;
2846
2847 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2848 /* XXX update access time */
2849 return (error);
2850 }
2851
2852 static int
2853 hammer_vop_fifowrite (struct vop_write_args *ap)
2854 {
2855 int error;
2856
2857 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2858 /* XXX update access time */
2859 return (error);
2860 }
2861
2862 static
2863 int
2864 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap)
2865 {
2866 int error;
2867
2868 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2869 if (error)
2870 error = hammer_vop_kqfilter(ap);
2871 return(error);
2872 }
2873
2874 static int
2875 hammer_vop_specclose (struct vop_close_args *ap)
2876 {
2877 /* XXX update itimes */
2878 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2879 }
2880
2881 static int
2882 hammer_vop_specread (struct vop_read_args *ap)
2883 {
2884 /* XXX update access time */
2885 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2886 }
2887
2888 static int
2889 hammer_vop_specwrite (struct vop_write_args *ap)
2890 {
2891 /* XXX update last change time */
2892 return (VOCALL(&spec_vnode_vops, &ap->a_head));
2893 }
2894
2895 /************************************************************************
2896 * KQFILTER OPS *
2897 ************************************************************************
2898 *
2899 */
2900 static void filt_hammerdetach(struct knote *kn);
2901 static int filt_hammerread(struct knote *kn, long hint);
2902 static int filt_hammerwrite(struct knote *kn, long hint);
2903 static int filt_hammervnode(struct knote *kn, long hint);
2904
2905 static struct filterops hammerread_filtops =
2906 { 1, NULL, filt_hammerdetach, filt_hammerread };
2907 static struct filterops hammerwrite_filtops =
2908 { 1, NULL, filt_hammerdetach, filt_hammerwrite };
2909 static struct filterops hammervnode_filtops =
2910 { 1, NULL, filt_hammerdetach, filt_hammervnode };
2911
2912 static
2913 int
2914 hammer_vop_kqfilter(struct vop_kqfilter_args *ap)
2915 {
2916 struct vnode *vp = ap->a_vp;
2917 struct knote *kn = ap->a_kn;
2918 lwkt_tokref ilock;
2919
2920 switch (kn->kn_filter) {
2921 case EVFILT_READ:
2922 kn->kn_fop = &hammerread_filtops;
2923 break;
2924 case EVFILT_WRITE:
2925 kn->kn_fop = &hammerwrite_filtops;
2926 break;
2927 case EVFILT_VNODE:
2928 kn->kn_fop = &hammervnode_filtops;
2929 break;
2930 default:
2931 return (1);
2932 }
2933
2934 kn->kn_hook = (caddr_t)vp;
2935
2936 lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token);
2937 SLIST_INSERT_HEAD(&vp->v_pollinfo.vpi_selinfo.si_note, kn, kn_selnext);
2938 lwkt_reltoken(&ilock);
2939
2940 return(0);
2941 }
2942
2943 static void
2944 filt_hammerdetach(struct knote *kn)
2945 {
2946 struct vnode *vp = (void *)kn->kn_hook;
2947 lwkt_tokref ilock;
2948
2949 lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token);
2950 SLIST_REMOVE(&vp->v_pollinfo.vpi_selinfo.si_note,
2951 kn, knote, kn_selnext);
2952 lwkt_reltoken(&ilock);
2953 }
2954
2955 static int
2956 filt_hammerread(struct knote *kn, long hint)
2957 {
2958 struct vnode *vp = (void *)kn->kn_hook;
2959 hammer_inode_t ip = VTOI(vp);
2960
2961 if (hint == NOTE_REVOKE) {
2962 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
2963 return(1);
2964 }
2965 kn->kn_data = ip->ino_data.size - kn->kn_fp->f_offset;
2966 return (kn->kn_data != 0);
2967 }
2968
2969 static int
2970 filt_hammerwrite(struct knote *kn, long hint)
2971 {
2972 if (hint == NOTE_REVOKE)
2973 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
2974 kn->kn_data = 0;
2975 return (1);
2976 }
2977
2978 static int
2979 filt_hammervnode(struct knote *kn, long hint)
2980 {
2981 if (kn->kn_sfflags & hint)
2982 kn->kn_fflags |= hint;
2983 if (hint == NOTE_REVOKE) {
2984 kn->kn_flags |= EV_EOF;
2985 return (1);
2986 }
2987 return (kn->kn_fflags != 0);
2988 }
2989
DragonFly BSD