HAMMER - Add live dedup sysctl and support
[dragonfly.git] / sys / vfs / hammer / hammer_vnops.c
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
51 #include <sys/mplock2.h>
52
53 #include "hammer.h"
54
55 /*
56  * USERFS VNOPS
57  */
58 /*static int hammer_vop_vnoperate(struct vop_generic_args *);*/
59 static int hammer_vop_fsync(struct vop_fsync_args *);
60 static int hammer_vop_read(struct vop_read_args *);
61 static int hammer_vop_write(struct vop_write_args *);
62 static int hammer_vop_access(struct vop_access_args *);
63 static int hammer_vop_advlock(struct vop_advlock_args *);
64 static int hammer_vop_close(struct vop_close_args *);
65 static int hammer_vop_ncreate(struct vop_ncreate_args *);
66 static int hammer_vop_getattr(struct vop_getattr_args *);
67 static int hammer_vop_nresolve(struct vop_nresolve_args *);
68 static int hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *);
69 static int hammer_vop_nlink(struct vop_nlink_args *);
70 static int hammer_vop_nmkdir(struct vop_nmkdir_args *);
71 static int hammer_vop_nmknod(struct vop_nmknod_args *);
72 static int hammer_vop_open(struct vop_open_args *);
73 static int hammer_vop_print(struct vop_print_args *);
74 static int hammer_vop_readdir(struct vop_readdir_args *);
75 static int hammer_vop_readlink(struct vop_readlink_args *);
76 static int hammer_vop_nremove(struct vop_nremove_args *);
77 static int hammer_vop_nrename(struct vop_nrename_args *);
78 static int hammer_vop_nrmdir(struct vop_nrmdir_args *);
79 static int hammer_vop_markatime(struct vop_markatime_args *);
80 static int hammer_vop_setattr(struct vop_setattr_args *);
81 static int hammer_vop_strategy(struct vop_strategy_args *);
82 static int hammer_vop_bmap(struct vop_bmap_args *ap);
83 static int hammer_vop_nsymlink(struct vop_nsymlink_args *);
84 static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *);
85 static int hammer_vop_ioctl(struct vop_ioctl_args *);
86 static int hammer_vop_mountctl(struct vop_mountctl_args *);
87 static int hammer_vop_kqfilter (struct vop_kqfilter_args *);
88
89 static int hammer_vop_fifoclose (struct vop_close_args *);
90 static int hammer_vop_fiforead (struct vop_read_args *);
91 static int hammer_vop_fifowrite (struct vop_write_args *);
92 static int hammer_vop_fifokqfilter (struct vop_kqfilter_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_markatime =        hammer_vop_markatime,
122         .vop_setattr =          hammer_vop_setattr,
123         .vop_bmap =             hammer_vop_bmap,
124         .vop_strategy =         hammer_vop_strategy,
125         .vop_nsymlink =         hammer_vop_nsymlink,
126         .vop_nwhiteout =        hammer_vop_nwhiteout,
127         .vop_ioctl =            hammer_vop_ioctl,
128         .vop_mountctl =         hammer_vop_mountctl,
129         .vop_kqfilter =         hammer_vop_kqfilter
130 };
131
132 struct vop_ops hammer_spec_vops = {
133         .vop_default =          vop_defaultop,
134         .vop_fsync =            hammer_vop_fsync,
135         .vop_read =             vop_stdnoread,
136         .vop_write =            vop_stdnowrite,
137         .vop_access =           hammer_vop_access,
138         .vop_close =            hammer_vop_close,
139         .vop_markatime =        hammer_vop_markatime,
140         .vop_getattr =          hammer_vop_getattr,
141         .vop_inactive =         hammer_vop_inactive,
142         .vop_reclaim =          hammer_vop_reclaim,
143         .vop_setattr =          hammer_vop_setattr
144 };
145
146 struct vop_ops hammer_fifo_vops = {
147         .vop_default =          fifo_vnoperate,
148         .vop_fsync =            hammer_vop_fsync,
149         .vop_read =             hammer_vop_fiforead,
150         .vop_write =            hammer_vop_fifowrite,
151         .vop_access =           hammer_vop_access,
152         .vop_close =            hammer_vop_fifoclose,
153         .vop_markatime =        hammer_vop_markatime,
154         .vop_getattr =          hammer_vop_getattr,
155         .vop_inactive =         hammer_vop_inactive,
156         .vop_reclaim =          hammer_vop_reclaim,
157         .vop_setattr =          hammer_vop_setattr,
158         .vop_kqfilter =         hammer_vop_fifokqfilter
159 };
160
161 static __inline
162 void
163 hammer_knote(struct vnode *vp, int flags)
164 {
165         if (flags)
166                 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags);
167 }
168
169 #ifdef DEBUG_TRUNCATE
170 struct hammer_inode *HammerTruncIp;
171 #endif
172
173 static int hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
174                            struct vnode *dvp, struct ucred *cred,
175                            int flags, int isdir);
176 static int hammer_vop_strategy_read(struct vop_strategy_args *ap);
177 static int hammer_vop_strategy_write(struct vop_strategy_args *ap);
178
179 #if 0
180 static
181 int
182 hammer_vop_vnoperate(struct vop_generic_args *)
183 {
184         return (VOCALL(&hammer_vnode_vops, ap));
185 }
186 #endif
187
188 /*
189  * hammer_vop_fsync { vp, waitfor }
190  *
191  * fsync() an inode to disk and wait for it to be completely committed
192  * such that the information would not be undone if a crash occured after
193  * return.
194  *
195  * NOTE: HAMMER's fsync()'s are going to remain expensive until we implement
196  *       a REDO log.  A sysctl is provided to relax HAMMER's fsync()
197  *       operation.
198  *
199  *       Ultimately the combination of a REDO log and use of fast storage
200  *       to front-end cluster caches will make fsync fast, but it aint
201  *       here yet.  And, in anycase, we need real transactional
202  *       all-or-nothing features which are not restricted to a single file.
203  */
204 static
205 int
206 hammer_vop_fsync(struct vop_fsync_args *ap)
207 {
208         hammer_inode_t ip = VTOI(ap->a_vp);
209         hammer_mount_t hmp = ip->hmp;
210         int waitfor = ap->a_waitfor;
211         int mode;
212
213         lwkt_gettoken(&hmp->fs_token);
214
215         /*
216          * Fsync rule relaxation (default is either full synchronous flush
217          * or REDO semantics with synchronous flush).
218          */
219         if (ap->a_flags & VOP_FSYNC_SYSCALL) {
220                 switch(hammer_fsync_mode) {
221                 case 0:
222 mode0:
223                         /* no REDO, full synchronous flush */
224                         goto skip;
225                 case 1:
226 mode1:
227                         /* no REDO, full asynchronous flush */
228                         if (waitfor == MNT_WAIT)
229                                 waitfor = MNT_NOWAIT;
230                         goto skip;
231                 case 2:
232                         /* REDO semantics, synchronous flush */
233                         if (hmp->version < HAMMER_VOL_VERSION_FOUR)
234                                 goto mode0;
235                         mode = HAMMER_FLUSH_UNDOS_AUTO;
236                         break;
237                 case 3:
238                         /* REDO semantics, relaxed asynchronous flush */
239                         if (hmp->version < HAMMER_VOL_VERSION_FOUR)
240                                 goto mode1;
241                         mode = HAMMER_FLUSH_UNDOS_RELAXED;
242                         if (waitfor == MNT_WAIT)
243                                 waitfor = MNT_NOWAIT;
244                         break;
245                 case 4:
246                         /* ignore the fsync() system call */
247                         lwkt_reltoken(&hmp->fs_token);
248                         return(0);
249                 default:
250                         /* we have to do something */
251                         mode = HAMMER_FLUSH_UNDOS_RELAXED;
252                         if (waitfor == MNT_WAIT)
253                                 waitfor = MNT_NOWAIT;
254                         break;
255                 }
256
257                 /*
258                  * Fast fsync only needs to flush the UNDO/REDO fifo if
259                  * HAMMER_INODE_REDO is non-zero and the only modifications
260                  * made to the file are write or write-extends.
261                  */
262                 if ((ip->flags & HAMMER_INODE_REDO) &&
263                     (ip->flags & HAMMER_INODE_MODMASK_NOREDO) == 0
264                 ) {
265                         ++hammer_count_fsyncs;
266                         hammer_flusher_flush_undos(hmp, mode);
267                         ip->redo_count = 0;
268                         lwkt_reltoken(&hmp->fs_token);
269                         return(0);
270                 }
271
272                 /*
273                  * REDO is enabled by fsync(), the idea being we really only
274                  * want to lay down REDO records when programs are using
275                  * fsync() heavily.  The first fsync() on the file starts
276                  * the gravy train going and later fsync()s keep it hot by
277                  * resetting the redo_count.
278                  *
279                  * We weren't running REDOs before now so we have to fall
280                  * through and do a full fsync of what we have.
281                  */
282                 if (hmp->version >= HAMMER_VOL_VERSION_FOUR &&
283                     (hmp->flags & HAMMER_MOUNT_REDO_RECOVERY_RUN) == 0) {
284                         ip->flags |= HAMMER_INODE_REDO;
285                         ip->redo_count = 0;
286                 }
287         }
288 skip:
289
290         /*
291          * Do a full flush sequence.
292          */
293         ++hammer_count_fsyncs;
294         vfsync(ap->a_vp, waitfor, 1, NULL, NULL);
295         hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
296         if (waitfor == MNT_WAIT) {
297                 vn_unlock(ap->a_vp);
298                 hammer_wait_inode(ip);
299                 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
300         }
301         lwkt_reltoken(&hmp->fs_token);
302         return (ip->error);
303 }
304
305 /*
306  * hammer_vop_read { vp, uio, ioflag, cred }
307  *
308  * MPSAFE (for the cache safe does not require fs_token)
309  */
310 static
311 int
312 hammer_vop_read(struct vop_read_args *ap)
313 {
314         struct hammer_transaction trans;
315         hammer_inode_t ip;
316         hammer_mount_t hmp;
317         off_t offset;
318         struct buf *bp;
319         struct uio *uio;
320         int error;
321         int n;
322         int seqcount;
323         int ioseqcount;
324         int blksize;
325         int bigread;
326         int got_fstoken;
327
328         if (ap->a_vp->v_type != VREG)
329                 return (EINVAL);
330         ip = VTOI(ap->a_vp);
331         hmp = ip->hmp;
332         error = 0;
333         uio = ap->a_uio;
334
335         /*
336          * Allow the UIO's size to override the sequential heuristic.
337          */
338         blksize = hammer_blocksize(uio->uio_offset);
339         seqcount = (uio->uio_resid + (BKVASIZE - 1)) / BKVASIZE;
340         ioseqcount = (ap->a_ioflag >> 16);
341         if (seqcount < ioseqcount)
342                 seqcount = ioseqcount;
343
344         /*
345          * If reading or writing a huge amount of data we have to break
346          * atomicy and allow the operation to be interrupted by a signal
347          * or it can DOS the machine.
348          */
349         bigread = (uio->uio_resid > 100 * 1024 * 1024);
350         got_fstoken = 0;
351
352         /*
353          * Access the data typically in HAMMER_BUFSIZE blocks via the
354          * buffer cache, but HAMMER may use a variable block size based
355          * on the offset.
356          *
357          * XXX Temporary hack, delay the start transaction while we remain
358          *     MPSAFE.  NOTE: ino_data.size cannot change while vnode is
359          *     locked-shared.
360          */
361         while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) {
362                 int64_t base_offset;
363                 int64_t file_limit;
364
365                 blksize = hammer_blocksize(uio->uio_offset);
366                 offset = (int)uio->uio_offset & (blksize - 1);
367                 base_offset = uio->uio_offset - offset;
368
369                 if (bigread && (error = hammer_signal_check(ip->hmp)) != 0)
370                         break;
371
372                 /*
373                  * MPSAFE
374                  */
375                 bp = getcacheblk(ap->a_vp, base_offset);
376                 if (bp) {
377                         error = 0;
378                         goto skip;
379                 }
380
381                 /*
382                  * MPUNSAFE
383                  */
384                 if (got_fstoken == 0) {
385                         lwkt_gettoken(&hmp->fs_token);
386                         got_fstoken = 1;
387                         hammer_start_transaction(&trans, ip->hmp);
388                 }
389
390                 if (hammer_cluster_enable) {
391                         /*
392                          * Use file_limit to prevent cluster_read() from
393                          * creating buffers of the wrong block size past
394                          * the demarc.
395                          */
396                         file_limit = ip->ino_data.size;
397                         if (base_offset < HAMMER_XDEMARC &&
398                             file_limit > HAMMER_XDEMARC) {
399                                 file_limit = HAMMER_XDEMARC;
400                         }
401                         error = cluster_read(ap->a_vp,
402                                              file_limit, base_offset,
403                                              blksize, uio->uio_resid,
404                                              seqcount * BKVASIZE, &bp);
405                 } else {
406                         error = bread(ap->a_vp, base_offset, blksize, &bp);
407                 }
408                 if (error) {
409                         brelse(bp);
410                         break;
411                 }
412 skip:
413                 if ((hammer_debug_io & 0x0001) && (bp->b_flags & B_IODEBUG)) {
414                         kprintf("doff %016jx read file %016jx@%016jx\n",
415                                 (intmax_t)bp->b_bio2.bio_offset,
416                                 (intmax_t)ip->obj_id,
417                                 (intmax_t)bp->b_loffset);
418                 }
419                 bp->b_flags &= ~B_IODEBUG;
420
421                 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
422                 n = blksize - offset;
423                 if (n > uio->uio_resid)
424                         n = uio->uio_resid;
425                 if (n > ip->ino_data.size - uio->uio_offset)
426                         n = (int)(ip->ino_data.size - uio->uio_offset);
427                 error = uiomove((char *)bp->b_data + offset, n, uio);
428
429                 /* data has a lower priority then meta-data */
430                 bp->b_flags |= B_AGE;
431                 bqrelse(bp);
432                 if (error)
433                         break;
434                 hammer_stats_file_read += n;
435         }
436
437         /*
438          * XXX only update the atime if we had to get the MP lock.
439          * XXX hack hack hack, fixme.
440          */
441         if (got_fstoken) {
442                 if ((ip->flags & HAMMER_INODE_RO) == 0 &&
443                     (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) {
444                         ip->ino_data.atime = trans.time;
445                         hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME);
446                 }
447                 hammer_done_transaction(&trans);
448                 lwkt_reltoken(&hmp->fs_token);
449         }
450         return (error);
451 }
452
453 /*
454  * hammer_vop_write { vp, uio, ioflag, cred }
455  */
456 static
457 int
458 hammer_vop_write(struct vop_write_args *ap)
459 {
460         struct hammer_transaction trans;
461         struct hammer_inode *ip;
462         hammer_mount_t hmp;
463         struct uio *uio;
464         int offset;
465         off_t base_offset;
466         struct buf *bp;
467         int kflags;
468         int error;
469         int n;
470         int flags;
471         int seqcount;
472         int bigwrite;
473
474         if (ap->a_vp->v_type != VREG)
475                 return (EINVAL);
476         ip = VTOI(ap->a_vp);
477         hmp = ip->hmp;
478         error = 0;
479         kflags = 0;
480         seqcount = ap->a_ioflag >> 16;
481
482         if (ip->flags & HAMMER_INODE_RO)
483                 return (EROFS);
484
485         /*
486          * Create a transaction to cover the operations we perform.
487          */
488         lwkt_gettoken(&hmp->fs_token);
489         hammer_start_transaction(&trans, hmp);
490         uio = ap->a_uio;
491
492         /*
493          * Check append mode
494          */
495         if (ap->a_ioflag & IO_APPEND)
496                 uio->uio_offset = ip->ino_data.size;
497
498         /*
499          * Check for illegal write offsets.  Valid range is 0...2^63-1.
500          *
501          * NOTE: the base_off assignment is required to work around what
502          * I consider to be a GCC-4 optimization bug.
503          */
504         if (uio->uio_offset < 0) {
505                 hammer_done_transaction(&trans);
506                 lwkt_reltoken(&hmp->fs_token);
507                 return (EFBIG);
508         }
509         base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */
510         if (uio->uio_resid > 0 && base_offset <= uio->uio_offset) {
511                 hammer_done_transaction(&trans);
512                 lwkt_reltoken(&hmp->fs_token);
513                 return (EFBIG);
514         }
515
516         /*
517          * If reading or writing a huge amount of data we have to break
518          * atomicy and allow the operation to be interrupted by a signal
519          * or it can DOS the machine.
520          *
521          * Preset redo_count so we stop generating REDOs earlier if the
522          * limit is exceeded.
523          */
524         bigwrite = (uio->uio_resid > 100 * 1024 * 1024);
525         if ((ip->flags & HAMMER_INODE_REDO) &&
526             ip->redo_count < hammer_limit_redo) {
527                 ip->redo_count += uio->uio_resid;
528         }
529
530         /*
531          * Access the data typically in HAMMER_BUFSIZE blocks via the
532          * buffer cache, but HAMMER may use a variable block size based
533          * on the offset.
534          */
535         while (uio->uio_resid > 0) {
536                 int fixsize = 0;
537                 int blksize;
538                 int blkmask;
539                 int trivial;
540                 int endofblk;
541                 off_t nsize;
542
543                 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0)
544                         break;
545                 if (bigwrite && (error = hammer_signal_check(hmp)) != 0)
546                         break;
547
548                 blksize = hammer_blocksize(uio->uio_offset);
549
550                 /*
551                  * Do not allow HAMMER to blow out the buffer cache.  Very
552                  * large UIOs can lockout other processes due to bwillwrite()
553                  * mechanics.
554                  *
555                  * The hammer inode is not locked during these operations.
556                  * The vnode is locked which can interfere with the pageout
557                  * daemon for non-UIO_NOCOPY writes but should not interfere
558                  * with the buffer cache.  Even so, we cannot afford to
559                  * allow the pageout daemon to build up too many dirty buffer
560                  * cache buffers.
561                  *
562                  * Only call this if we aren't being recursively called from
563                  * a virtual disk device (vn), else we may deadlock.
564                  */
565                 if ((ap->a_ioflag & IO_RECURSE) == 0)
566                         bwillwrite(blksize);
567
568                 /*
569                  * Control the number of pending records associated with
570                  * this inode.  If too many have accumulated start a
571                  * flush.  Try to maintain a pipeline with the flusher.
572                  */
573                 if (ip->rsv_recs >= hammer_limit_inode_recs) {
574                         hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
575                 }
576                 if (ip->rsv_recs >= hammer_limit_inode_recs * 2) {
577                         while (ip->rsv_recs >= hammer_limit_inode_recs) {
578                                 tsleep(&ip->rsv_recs, 0, "hmrwww", hz);
579                         }
580                         hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
581                 }
582
583 #if 0
584                 /*
585                  * Do not allow HAMMER to blow out system memory by
586                  * accumulating too many records.   Records are so well
587                  * decoupled from the buffer cache that it is possible
588                  * for userland to push data out to the media via
589                  * direct-write, but build up the records queued to the
590                  * backend faster then the backend can flush them out.
591                  * HAMMER has hit its write limit but the frontend has
592                  * no pushback to slow it down.
593                  */
594                 if (hmp->rsv_recs > hammer_limit_recs / 2) {
595                         /*
596                          * Get the inode on the flush list
597                          */
598                         if (ip->rsv_recs >= 64)
599                                 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
600                         else if (ip->rsv_recs >= 16)
601                                 hammer_flush_inode(ip, 0);
602
603                         /*
604                          * Keep the flusher going if the system keeps
605                          * queueing records.
606                          */
607                         delta = hmp->count_newrecords -
608                                 hmp->last_newrecords;
609                         if (delta < 0 || delta > hammer_limit_recs / 2) {
610                                 hmp->last_newrecords = hmp->count_newrecords;
611                                 hammer_sync_hmp(hmp, MNT_NOWAIT);
612                         }
613
614                         /*
615                          * If we have gotten behind start slowing
616                          * down the writers.
617                          */
618                         delta = (hmp->rsv_recs - hammer_limit_recs) *
619                                 hz / hammer_limit_recs;
620                         if (delta > 0)
621                                 tsleep(&trans, 0, "hmrslo", delta);
622                 }
623 #endif
624
625                 /*
626                  * Calculate the blocksize at the current offset and figure
627                  * out how much we can actually write.
628                  */
629                 blkmask = blksize - 1;
630                 offset = (int)uio->uio_offset & blkmask;
631                 base_offset = uio->uio_offset & ~(int64_t)blkmask;
632                 n = blksize - offset;
633                 if (n > uio->uio_resid) {
634                         n = uio->uio_resid;
635                         endofblk = 0;
636                 } else {
637                         endofblk = 1;
638                 }
639                 nsize = uio->uio_offset + n;
640                 if (nsize > ip->ino_data.size) {
641                         if (uio->uio_offset > ip->ino_data.size)
642                                 trivial = 0;
643                         else
644                                 trivial = 1;
645                         nvextendbuf(ap->a_vp,
646                                     ip->ino_data.size,
647                                     nsize,
648                                     hammer_blocksize(ip->ino_data.size),
649                                     hammer_blocksize(nsize),
650                                     hammer_blockoff(ip->ino_data.size),
651                                     hammer_blockoff(nsize),
652                                     trivial);
653                         fixsize = 1;
654                         kflags |= NOTE_EXTEND;
655                 }
656
657                 if (uio->uio_segflg == UIO_NOCOPY) {
658                         /*
659                          * Issuing a write with the same data backing the
660                          * buffer.  Instantiate the buffer to collect the
661                          * backing vm pages, then read-in any missing bits.
662                          *
663                          * This case is used by vop_stdputpages().
664                          */
665                         bp = getblk(ap->a_vp, base_offset,
666                                     blksize, GETBLK_BHEAVY, 0);
667                         if ((bp->b_flags & B_CACHE) == 0) {
668                                 bqrelse(bp);
669                                 error = bread(ap->a_vp, base_offset,
670                                               blksize, &bp);
671                         }
672                 } else if (offset == 0 && uio->uio_resid >= blksize) {
673                         /*
674                          * Even though we are entirely overwriting the buffer
675                          * we may still have to zero it out to avoid a 
676                          * mmap/write visibility issue.
677                          */
678                         bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0);
679                         if ((bp->b_flags & B_CACHE) == 0)
680                                 vfs_bio_clrbuf(bp);
681                 } else if (base_offset >= ip->ino_data.size) {
682                         /*
683                          * If the base offset of the buffer is beyond the
684                          * file EOF, we don't have to issue a read.
685                          */
686                         bp = getblk(ap->a_vp, base_offset,
687                                     blksize, GETBLK_BHEAVY, 0);
688                         vfs_bio_clrbuf(bp);
689                 } else {
690                         /*
691                          * Partial overwrite, read in any missing bits then
692                          * replace the portion being written.
693                          */
694                         error = bread(ap->a_vp, base_offset, blksize, &bp);
695                         if (error == 0)
696                                 bheavy(bp);
697                 }
698                 if (error == 0)
699                         error = uiomove(bp->b_data + offset, n, uio);
700
701                 /*
702                  * Generate REDO records if enabled and redo_count will not
703                  * exceeded the limit.
704                  *
705                  * If redo_count exceeds the limit we stop generating records
706                  * and clear HAMMER_INODE_REDO.  This will cause the next
707                  * fsync() to do a full meta-data sync instead of just an
708                  * UNDO/REDO fifo update.
709                  *
710                  * When clearing HAMMER_INODE_REDO any pre-existing REDOs
711                  * will still be tracked.  The tracks will be terminated
712                  * when the related meta-data (including possible data
713                  * modifications which are not tracked via REDO) is
714                  * flushed.
715                  */
716                 if ((ip->flags & HAMMER_INODE_REDO) && error == 0) {
717                         if (ip->redo_count < hammer_limit_redo) {
718                                 bp->b_flags |= B_VFSFLAG1;
719                                 error = hammer_generate_redo(&trans, ip,
720                                                      base_offset + offset,
721                                                      HAMMER_REDO_WRITE,
722                                                      bp->b_data + offset,
723                                                      (size_t)n);
724                         } else {
725                                 ip->flags &= ~HAMMER_INODE_REDO;
726                         }
727                 }
728
729                 /*
730                  * If we screwed up we have to undo any VM size changes we
731                  * made.
732                  */
733                 if (error) {
734                         brelse(bp);
735                         if (fixsize) {
736                                 nvtruncbuf(ap->a_vp, ip->ino_data.size,
737                                           hammer_blocksize(ip->ino_data.size),
738                                           hammer_blockoff(ip->ino_data.size));
739                         }
740                         break;
741                 }
742                 kflags |= NOTE_WRITE;
743                 hammer_stats_file_write += n;
744                 /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */
745                 if (ip->ino_data.size < uio->uio_offset) {
746                         ip->ino_data.size = uio->uio_offset;
747                         flags = HAMMER_INODE_SDIRTY;
748                 } else {
749                         flags = 0;
750                 }
751                 ip->ino_data.mtime = trans.time;
752                 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS;
753                 hammer_modify_inode(&trans, ip, flags);
754
755                 /*
756                  * Once we dirty the buffer any cached zone-X offset
757                  * becomes invalid.  HAMMER NOTE: no-history mode cannot 
758                  * allow overwriting over the same data sector unless
759                  * we provide UNDOs for the old data, which we don't.
760                  */
761                 bp->b_bio2.bio_offset = NOOFFSET;
762
763                 /*
764                  * Final buffer disposition.
765                  *
766                  * Because meta-data updates are deferred, HAMMER is
767                  * especially sensitive to excessive bdwrite()s because
768                  * the I/O stream is not broken up by disk reads.  So the
769                  * buffer cache simply cannot keep up.
770                  *
771                  * WARNING!  blksize is variable.  cluster_write() is
772                  *           expected to not blow up if it encounters
773                  *           buffers that do not match the passed blksize.
774                  *
775                  * NOTE!  Hammer shouldn't need to bawrite()/cluster_write().
776                  *        The ip->rsv_recs check should burst-flush the data.
777                  *        If we queue it immediately the buf could be left
778                  *        locked on the device queue for a very long time.
779                  *
780                  * NOTE!  To avoid degenerate stalls due to mismatched block
781                  *        sizes we only honor IO_DIRECT on the write which
782                  *        abuts the end of the buffer.  However, we must
783                  *        honor IO_SYNC in case someone is silly enough to
784                  *        configure a HAMMER file as swap, or when HAMMER
785                  *        is serving NFS (for commits).  Ick ick.
786                  */
787                 bp->b_flags |= B_AGE;
788                 if (ap->a_ioflag & IO_SYNC) {
789                         bwrite(bp);
790                 } else if ((ap->a_ioflag & IO_DIRECT) && endofblk) {
791                         bawrite(bp);
792                 } else {
793 #if 0
794                 if (offset + n == blksize) {
795                         if (hammer_cluster_enable == 0 ||
796                             (ap->a_vp->v_mount->mnt_flag & MNT_NOCLUSTERW)) {
797                                 bawrite(bp);
798                         } else {
799                                 cluster_write(bp, ip->ino_data.size,
800                                               blksize, seqcount);
801                         }
802                 } else {
803 #endif
804                         bdwrite(bp);
805                 }
806         }
807         hammer_done_transaction(&trans);
808         hammer_knote(ap->a_vp, kflags);
809         lwkt_reltoken(&hmp->fs_token);
810         return (error);
811 }
812
813 /*
814  * hammer_vop_access { vp, mode, cred }
815  *
816  * MPSAFE - does not require fs_token
817  */
818 static
819 int
820 hammer_vop_access(struct vop_access_args *ap)
821 {
822         struct hammer_inode *ip = VTOI(ap->a_vp);
823         uid_t uid;
824         gid_t gid;
825         int error;
826
827         ++hammer_stats_file_iopsr;
828         uid = hammer_to_unix_xid(&ip->ino_data.uid);
829         gid = hammer_to_unix_xid(&ip->ino_data.gid);
830
831         error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
832                                   ip->ino_data.uflags);
833         return (error);
834 }
835
836 /*
837  * hammer_vop_advlock { vp, id, op, fl, flags }
838  *
839  * MPSAFE - does not require fs_token
840  */
841 static
842 int
843 hammer_vop_advlock(struct vop_advlock_args *ap)
844 {
845         hammer_inode_t ip = VTOI(ap->a_vp);
846
847         return (lf_advlock(ap, &ip->advlock, ip->ino_data.size));
848 }
849
850 /*
851  * hammer_vop_close { vp, fflag }
852  *
853  * We can only sync-on-close for normal closes.  XXX disabled for now.
854  */
855 static
856 int
857 hammer_vop_close(struct vop_close_args *ap)
858 {
859 #if 0
860         struct vnode *vp = ap->a_vp;
861         hammer_inode_t ip = VTOI(vp);
862         int waitfor;
863         if (ip->flags & (HAMMER_INODE_CLOSESYNC|HAMMER_INODE_CLOSEASYNC)) {
864                 if (vn_islocked(vp) == LK_EXCLUSIVE &&
865                     (vp->v_flag & (VINACTIVE|VRECLAIMED)) == 0) {
866                         if (ip->flags & HAMMER_INODE_CLOSESYNC)
867                                 waitfor = MNT_WAIT;
868                         else
869                                 waitfor = MNT_NOWAIT;
870                         ip->flags &= ~(HAMMER_INODE_CLOSESYNC |
871                                        HAMMER_INODE_CLOSEASYNC);
872                         VOP_FSYNC(vp, MNT_NOWAIT, waitfor);
873                 }
874         }
875 #endif
876         return (vop_stdclose(ap));
877 }
878
879 /*
880  * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
881  *
882  * The operating system has already ensured that the directory entry
883  * does not exist and done all appropriate namespace locking.
884  */
885 static
886 int
887 hammer_vop_ncreate(struct vop_ncreate_args *ap)
888 {
889         struct hammer_transaction trans;
890         struct hammer_inode *dip;
891         struct hammer_inode *nip;
892         struct nchandle *nch;
893         hammer_mount_t hmp;
894         int error;
895
896         nch = ap->a_nch;
897         dip = VTOI(ap->a_dvp);
898         hmp = dip->hmp;
899
900         if (dip->flags & HAMMER_INODE_RO)
901                 return (EROFS);
902         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
903                 return (error);
904
905         /*
906          * Create a transaction to cover the operations we perform.
907          */
908         lwkt_gettoken(&hmp->fs_token);
909         hammer_start_transaction(&trans, hmp);
910         ++hammer_stats_file_iopsw;
911
912         /*
913          * Create a new filesystem object of the requested type.  The
914          * returned inode will be referenced and shared-locked to prevent
915          * it from being moved to the flusher.
916          */
917         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
918                                     dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
919                                     NULL, &nip);
920         if (error) {
921                 hkprintf("hammer_create_inode error %d\n", error);
922                 hammer_done_transaction(&trans);
923                 *ap->a_vpp = NULL;
924                 lwkt_reltoken(&hmp->fs_token);
925                 return (error);
926         }
927
928         /*
929          * Add the new filesystem object to the directory.  This will also
930          * bump the inode's link count.
931          */
932         error = hammer_ip_add_directory(&trans, dip,
933                                         nch->ncp->nc_name, nch->ncp->nc_nlen,
934                                         nip);
935         if (error)
936                 hkprintf("hammer_ip_add_directory error %d\n", error);
937
938         /*
939          * Finish up.
940          */
941         if (error) {
942                 hammer_rel_inode(nip, 0);
943                 hammer_done_transaction(&trans);
944                 *ap->a_vpp = NULL;
945         } else {
946                 error = hammer_get_vnode(nip, ap->a_vpp);
947                 hammer_done_transaction(&trans);
948                 hammer_rel_inode(nip, 0);
949                 if (error == 0) {
950                         cache_setunresolved(ap->a_nch);
951                         cache_setvp(ap->a_nch, *ap->a_vpp);
952                 }
953                 hammer_knote(ap->a_dvp, NOTE_WRITE);
954         }
955         lwkt_reltoken(&hmp->fs_token);
956         return (error);
957 }
958
959 /*
960  * hammer_vop_getattr { vp, vap }
961  *
962  * Retrieve an inode's attribute information.  When accessing inodes
963  * historically we fake the atime field to ensure consistent results.
964  * The atime field is stored in the B-Tree element and allowed to be
965  * updated without cycling the element.
966  *
967  * MPSAFE - does not require fs_token
968  */
969 static
970 int
971 hammer_vop_getattr(struct vop_getattr_args *ap)
972 {
973         struct hammer_inode *ip = VTOI(ap->a_vp);
974         struct vattr *vap = ap->a_vap;
975
976         /*
977          * We want the fsid to be different when accessing a filesystem
978          * with different as-of's so programs like diff don't think
979          * the files are the same.
980          *
981          * We also want the fsid to be the same when comparing snapshots,
982          * or when comparing mirrors (which might be backed by different
983          * physical devices).  HAMMER fsids are based on the PFS's
984          * shared_uuid field.
985          *
986          * XXX there is a chance of collision here.  The va_fsid reported
987          * by stat is different from the more involved fsid used in the
988          * mount structure.
989          */
990         ++hammer_stats_file_iopsr;
991         hammer_lock_sh(&ip->lock);
992         vap->va_fsid = ip->pfsm->fsid_udev ^ (u_int32_t)ip->obj_asof ^
993                        (u_int32_t)(ip->obj_asof >> 32);
994
995         vap->va_fileid = ip->ino_leaf.base.obj_id;
996         vap->va_mode = ip->ino_data.mode;
997         vap->va_nlink = ip->ino_data.nlinks;
998         vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
999         vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1000         vap->va_rmajor = 0;
1001         vap->va_rminor = 0;
1002         vap->va_size = ip->ino_data.size;
1003
1004         /*
1005          * Special case for @@PFS softlinks.  The actual size of the
1006          * expanded softlink is "@@0x%016llx:%05d" == 26 bytes.
1007          * or for MAX_TID is    "@@-1:%05d" == 10 bytes.
1008          */
1009         if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK &&
1010             ip->ino_data.size == 10 &&
1011             ip->obj_asof == HAMMER_MAX_TID &&
1012             ip->obj_localization == 0 &&
1013             strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) {
1014                     if (ip->pfsm->pfsd.mirror_flags & HAMMER_PFSD_SLAVE)
1015                             vap->va_size = 26;
1016                     else
1017                             vap->va_size = 10;
1018         }
1019
1020         /*
1021          * We must provide a consistent atime and mtime for snapshots
1022          * so people can do a 'tar cf - ... | md5' on them and get
1023          * consistent results.
1024          */
1025         if (ip->flags & HAMMER_INODE_RO) {
1026                 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime);
1027                 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime);
1028         } else {
1029                 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime);
1030                 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime);
1031         }
1032         hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
1033         vap->va_flags = ip->ino_data.uflags;
1034         vap->va_gen = 1;        /* hammer inums are unique for all time */
1035         vap->va_blocksize = HAMMER_BUFSIZE;
1036         if (ip->ino_data.size >= HAMMER_XDEMARC) {
1037                 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) &
1038                                 ~HAMMER_XBUFMASK64;
1039         } else if (ip->ino_data.size > HAMMER_BUFSIZE / 2) {
1040                 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) &
1041                                 ~HAMMER_BUFMASK64;
1042         } else {
1043                 vap->va_bytes = (ip->ino_data.size + 15) & ~15;
1044         }
1045
1046         vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type);
1047         vap->va_filerev = 0;    /* XXX */
1048         vap->va_uid_uuid = ip->ino_data.uid;
1049         vap->va_gid_uuid = ip->ino_data.gid;
1050         vap->va_fsid_uuid = ip->hmp->fsid;
1051         vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
1052                           VA_FSID_UUID_VALID;
1053
1054         switch (ip->ino_data.obj_type) {
1055         case HAMMER_OBJTYPE_CDEV:
1056         case HAMMER_OBJTYPE_BDEV:
1057                 vap->va_rmajor = ip->ino_data.rmajor;
1058                 vap->va_rminor = ip->ino_data.rminor;
1059                 break;
1060         default:
1061                 break;
1062         }
1063         hammer_unlock(&ip->lock);
1064         return(0);
1065 }
1066
1067 /*
1068  * hammer_vop_nresolve { nch, dvp, cred }
1069  *
1070  * Locate the requested directory entry.
1071  */
1072 static
1073 int
1074 hammer_vop_nresolve(struct vop_nresolve_args *ap)
1075 {
1076         struct hammer_transaction trans;
1077         struct namecache *ncp;
1078         hammer_mount_t hmp;
1079         hammer_inode_t dip;
1080         hammer_inode_t ip;
1081         hammer_tid_t asof;
1082         struct hammer_cursor cursor;
1083         struct vnode *vp;
1084         int64_t namekey;
1085         int error;
1086         int i;
1087         int nlen;
1088         int flags;
1089         int ispfs;
1090         int64_t obj_id;
1091         u_int32_t localization;
1092         u_int32_t max_iterations;
1093
1094         /*
1095          * Misc initialization, plus handle as-of name extensions.  Look for
1096          * the '@@' extension.  Note that as-of files and directories cannot
1097          * be modified.
1098          */
1099         dip = VTOI(ap->a_dvp);
1100         ncp = ap->a_nch->ncp;
1101         asof = dip->obj_asof;
1102         localization = dip->obj_localization;   /* for code consistency */
1103         nlen = ncp->nc_nlen;
1104         flags = dip->flags & HAMMER_INODE_RO;
1105         ispfs = 0;
1106         hmp = dip->hmp;
1107
1108         lwkt_gettoken(&hmp->fs_token);
1109         hammer_simple_transaction(&trans, hmp);
1110         ++hammer_stats_file_iopsr;
1111
1112         for (i = 0; i < nlen; ++i) {
1113                 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
1114                         error = hammer_str_to_tid(ncp->nc_name + i + 2,
1115                                                   &ispfs, &asof, &localization);
1116                         if (error != 0) {
1117                                 i = nlen;
1118                                 break;
1119                         }
1120                         if (asof != HAMMER_MAX_TID)
1121                                 flags |= HAMMER_INODE_RO;
1122                         break;
1123                 }
1124         }
1125         nlen = i;
1126
1127         /*
1128          * If this is a PFS softlink we dive into the PFS
1129          */
1130         if (ispfs && nlen == 0) {
1131                 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT,
1132                                       asof, localization,
1133                                       flags, &error);
1134                 if (error == 0) {
1135                         error = hammer_get_vnode(ip, &vp);
1136                         hammer_rel_inode(ip, 0);
1137                 } else {
1138                         vp = NULL;
1139                 }
1140                 if (error == 0) {
1141                         vn_unlock(vp);
1142                         cache_setvp(ap->a_nch, vp);
1143                         vrele(vp);
1144                 }
1145                 goto done;
1146         }
1147
1148         /*
1149          * If there is no path component the time extension is relative to dip.
1150          * e.g. "fubar/@@<snapshot>"
1151          *
1152          * "." is handled by the kernel, but ".@@<snapshot>" is not.
1153          * e.g. "fubar/.@@<snapshot>"
1154          *
1155          * ".." is handled by the kernel.  We do not currently handle
1156          * "..@<snapshot>".
1157          */
1158         if (nlen == 0 || (nlen == 1 && ncp->nc_name[0] == '.')) {
1159                 ip = hammer_get_inode(&trans, dip, dip->obj_id,
1160                                       asof, dip->obj_localization,
1161                                       flags, &error);
1162                 if (error == 0) {
1163                         error = hammer_get_vnode(ip, &vp);
1164                         hammer_rel_inode(ip, 0);
1165                 } else {
1166                         vp = NULL;
1167                 }
1168                 if (error == 0) {
1169                         vn_unlock(vp);
1170                         cache_setvp(ap->a_nch, vp);
1171                         vrele(vp);
1172                 }
1173                 goto done;
1174         }
1175
1176         /*
1177          * Calculate the namekey and setup the key range for the scan.  This
1178          * works kinda like a chained hash table where the lower 32 bits
1179          * of the namekey synthesize the chain.
1180          *
1181          * The key range is inclusive of both key_beg and key_end.
1182          */
1183         namekey = hammer_directory_namekey(dip, ncp->nc_name, nlen,
1184                                            &max_iterations);
1185
1186         error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip);
1187         cursor.key_beg.localization = dip->obj_localization +
1188                                       hammer_dir_localization(dip);
1189         cursor.key_beg.obj_id = dip->obj_id;
1190         cursor.key_beg.key = namekey;
1191         cursor.key_beg.create_tid = 0;
1192         cursor.key_beg.delete_tid = 0;
1193         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1194         cursor.key_beg.obj_type = 0;
1195
1196         cursor.key_end = cursor.key_beg;
1197         cursor.key_end.key += max_iterations;
1198         cursor.asof = asof;
1199         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1200
1201         /*
1202          * Scan all matching records (the chain), locate the one matching
1203          * the requested path component.
1204          *
1205          * The hammer_ip_*() functions merge in-memory records with on-disk
1206          * records for the purposes of the search.
1207          */
1208         obj_id = 0;
1209         localization = HAMMER_DEF_LOCALIZATION;
1210
1211         if (error == 0) {
1212                 error = hammer_ip_first(&cursor);
1213                 while (error == 0) {
1214                         error = hammer_ip_resolve_data(&cursor);
1215                         if (error)
1216                                 break;
1217                         if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF &&
1218                             bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
1219                                 obj_id = cursor.data->entry.obj_id;
1220                                 localization = cursor.data->entry.localization;
1221                                 break;
1222                         }
1223                         error = hammer_ip_next(&cursor);
1224                 }
1225         }
1226         hammer_done_cursor(&cursor);
1227
1228         /*
1229          * Lookup the obj_id.  This should always succeed.  If it does not
1230          * the filesystem may be damaged and we return a dummy inode.
1231          */
1232         if (error == 0) {
1233                 ip = hammer_get_inode(&trans, dip, obj_id,
1234                                       asof, localization,
1235                                       flags, &error);
1236                 if (error == ENOENT) {
1237                         kprintf("HAMMER: WARNING: Missing "
1238                                 "inode for dirent \"%s\"\n"
1239                                 "\tobj_id = %016llx, asof=%016llx, lo=%08x\n",
1240                                 ncp->nc_name,
1241                                 (long long)obj_id, (long long)asof,
1242                                 localization);
1243                         error = 0;
1244                         ip = hammer_get_dummy_inode(&trans, dip, obj_id,
1245                                                     asof, localization,
1246                                                     flags, &error);
1247                 }
1248                 if (error == 0) {
1249                         error = hammer_get_vnode(ip, &vp);
1250                         hammer_rel_inode(ip, 0);
1251                 } else {
1252                         vp = NULL;
1253                 }
1254                 if (error == 0) {
1255                         vn_unlock(vp);
1256                         cache_setvp(ap->a_nch, vp);
1257                         vrele(vp);
1258                 }
1259         } else if (error == ENOENT) {
1260                 cache_setvp(ap->a_nch, NULL);
1261         }
1262 done:
1263         hammer_done_transaction(&trans);
1264         lwkt_reltoken(&hmp->fs_token);
1265         return (error);
1266 }
1267
1268 /*
1269  * hammer_vop_nlookupdotdot { dvp, vpp, cred }
1270  *
1271  * Locate the parent directory of a directory vnode.
1272  *
1273  * dvp is referenced but not locked.  *vpp must be returned referenced and
1274  * locked.  A parent_obj_id of 0 does not necessarily indicate that we are
1275  * at the root, instead it could indicate that the directory we were in was
1276  * removed.
1277  *
1278  * NOTE: as-of sequences are not linked into the directory structure.  If
1279  * we are at the root with a different asof then the mount point, reload
1280  * the same directory with the mount point's asof.   I'm not sure what this
1281  * will do to NFS.  We encode ASOF stamps in NFS file handles so it might not
1282  * get confused, but it hasn't been tested.
1283  */
1284 static
1285 int
1286 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
1287 {
1288         struct hammer_transaction trans;
1289         struct hammer_inode *dip;
1290         struct hammer_inode *ip;
1291         hammer_mount_t hmp;
1292         int64_t parent_obj_id;
1293         u_int32_t parent_obj_localization;
1294         hammer_tid_t asof;
1295         int error;
1296
1297         dip = VTOI(ap->a_dvp);
1298         asof = dip->obj_asof;
1299         hmp = dip->hmp;
1300
1301         /*
1302          * Whos are parent?  This could be the root of a pseudo-filesystem
1303          * whos parent is in another localization domain.
1304          */
1305         lwkt_gettoken(&hmp->fs_token);
1306         parent_obj_id = dip->ino_data.parent_obj_id;
1307         if (dip->obj_id == HAMMER_OBJID_ROOT)
1308                 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization;
1309         else
1310                 parent_obj_localization = dip->obj_localization;
1311
1312         if (parent_obj_id == 0) {
1313                 if (dip->obj_id == HAMMER_OBJID_ROOT &&
1314                    asof != hmp->asof) {
1315                         parent_obj_id = dip->obj_id;
1316                         asof = hmp->asof;
1317                         *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK);
1318                         ksnprintf(*ap->a_fakename, 19, "0x%016llx",
1319                                   (long long)dip->obj_asof);
1320                 } else {
1321                         *ap->a_vpp = NULL;
1322                         lwkt_reltoken(&hmp->fs_token);
1323                         return ENOENT;
1324                 }
1325         }
1326
1327         hammer_simple_transaction(&trans, hmp);
1328         ++hammer_stats_file_iopsr;
1329
1330         ip = hammer_get_inode(&trans, dip, parent_obj_id,
1331                               asof, parent_obj_localization,
1332                               dip->flags, &error);
1333         if (ip) {
1334                 error = hammer_get_vnode(ip, ap->a_vpp);
1335                 hammer_rel_inode(ip, 0);
1336         } else {
1337                 *ap->a_vpp = NULL;
1338         }
1339         hammer_done_transaction(&trans);
1340         lwkt_reltoken(&hmp->fs_token);
1341         return (error);
1342 }
1343
1344 /*
1345  * hammer_vop_nlink { nch, dvp, vp, cred }
1346  */
1347 static
1348 int
1349 hammer_vop_nlink(struct vop_nlink_args *ap)
1350 {
1351         struct hammer_transaction trans;
1352         struct hammer_inode *dip;
1353         struct hammer_inode *ip;
1354         struct nchandle *nch;
1355         hammer_mount_t hmp;
1356         int error;
1357
1358         if (ap->a_dvp->v_mount != ap->a_vp->v_mount)    
1359                 return(EXDEV);
1360
1361         nch = ap->a_nch;
1362         dip = VTOI(ap->a_dvp);
1363         ip = VTOI(ap->a_vp);
1364         hmp = dip->hmp;
1365
1366         if (dip->obj_localization != ip->obj_localization)
1367                 return(EXDEV);
1368
1369         if (dip->flags & HAMMER_INODE_RO)
1370                 return (EROFS);
1371         if (ip->flags & HAMMER_INODE_RO)
1372                 return (EROFS);
1373         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1374                 return (error);
1375
1376         /*
1377          * Create a transaction to cover the operations we perform.
1378          */
1379         lwkt_gettoken(&hmp->fs_token);
1380         hammer_start_transaction(&trans, hmp);
1381         ++hammer_stats_file_iopsw;
1382
1383         /*
1384          * Add the filesystem object to the directory.  Note that neither
1385          * dip nor ip are referenced or locked, but their vnodes are
1386          * referenced.  This function will bump the inode's link count.
1387          */
1388         error = hammer_ip_add_directory(&trans, dip,
1389                                         nch->ncp->nc_name, nch->ncp->nc_nlen,
1390                                         ip);
1391
1392         /*
1393          * Finish up.
1394          */
1395         if (error == 0) {
1396                 cache_setunresolved(nch);
1397                 cache_setvp(nch, ap->a_vp);
1398         }
1399         hammer_done_transaction(&trans);
1400         hammer_knote(ap->a_vp, NOTE_LINK);
1401         hammer_knote(ap->a_dvp, NOTE_WRITE);
1402         lwkt_reltoken(&hmp->fs_token);
1403         return (error);
1404 }
1405
1406 /*
1407  * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
1408  *
1409  * The operating system has already ensured that the directory entry
1410  * does not exist and done all appropriate namespace locking.
1411  */
1412 static
1413 int
1414 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
1415 {
1416         struct hammer_transaction trans;
1417         struct hammer_inode *dip;
1418         struct hammer_inode *nip;
1419         struct nchandle *nch;
1420         hammer_mount_t hmp;
1421         int error;
1422
1423         nch = ap->a_nch;
1424         dip = VTOI(ap->a_dvp);
1425         hmp = dip->hmp;
1426
1427         if (dip->flags & HAMMER_INODE_RO)
1428                 return (EROFS);
1429         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1430                 return (error);
1431
1432         /*
1433          * Create a transaction to cover the operations we perform.
1434          */
1435         lwkt_gettoken(&hmp->fs_token);
1436         hammer_start_transaction(&trans, hmp);
1437         ++hammer_stats_file_iopsw;
1438
1439         /*
1440          * Create a new filesystem object of the requested type.  The
1441          * returned inode will be referenced but not locked.
1442          */
1443         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1444                                     dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
1445                                     NULL, &nip);
1446         if (error) {
1447                 hkprintf("hammer_mkdir error %d\n", error);
1448                 hammer_done_transaction(&trans);
1449                 *ap->a_vpp = NULL;
1450                 lwkt_reltoken(&hmp->fs_token);
1451                 return (error);
1452         }
1453         /*
1454          * Add the new filesystem object to the directory.  This will also
1455          * bump the inode's link count.
1456          */
1457         error = hammer_ip_add_directory(&trans, dip,
1458                                         nch->ncp->nc_name, nch->ncp->nc_nlen,
1459                                         nip);
1460         if (error)
1461                 hkprintf("hammer_mkdir (add) error %d\n", error);
1462
1463         /*
1464          * Finish up.
1465          */
1466         if (error) {
1467                 hammer_rel_inode(nip, 0);
1468                 *ap->a_vpp = NULL;
1469         } else {
1470                 error = hammer_get_vnode(nip, ap->a_vpp);
1471                 hammer_rel_inode(nip, 0);
1472                 if (error == 0) {
1473                         cache_setunresolved(ap->a_nch);
1474                         cache_setvp(ap->a_nch, *ap->a_vpp);
1475                 }
1476         }
1477         hammer_done_transaction(&trans);
1478         if (error == 0)
1479                 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1480         lwkt_reltoken(&hmp->fs_token);
1481         return (error);
1482 }
1483
1484 /*
1485  * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
1486  *
1487  * The operating system has already ensured that the directory entry
1488  * does not exist and done all appropriate namespace locking.
1489  */
1490 static
1491 int
1492 hammer_vop_nmknod(struct vop_nmknod_args *ap)
1493 {
1494         struct hammer_transaction trans;
1495         struct hammer_inode *dip;
1496         struct hammer_inode *nip;
1497         struct nchandle *nch;
1498         hammer_mount_t hmp;
1499         int error;
1500
1501         nch = ap->a_nch;
1502         dip = VTOI(ap->a_dvp);
1503         hmp = dip->hmp;
1504
1505         if (dip->flags & HAMMER_INODE_RO)
1506                 return (EROFS);
1507         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1508                 return (error);
1509
1510         /*
1511          * Create a transaction to cover the operations we perform.
1512          */
1513         lwkt_gettoken(&hmp->fs_token);
1514         hammer_start_transaction(&trans, hmp);
1515         ++hammer_stats_file_iopsw;
1516
1517         /*
1518          * Create a new filesystem object of the requested type.  The
1519          * returned inode will be referenced but not locked.
1520          *
1521          * If mknod specifies a directory a pseudo-fs is created.
1522          */
1523         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1524                                     dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
1525                                     NULL, &nip);
1526         if (error) {
1527                 hammer_done_transaction(&trans);
1528                 *ap->a_vpp = NULL;
1529                 lwkt_reltoken(&hmp->fs_token);
1530                 return (error);
1531         }
1532
1533         /*
1534          * Add the new filesystem object to the directory.  This will also
1535          * bump the inode's link count.
1536          */
1537         error = hammer_ip_add_directory(&trans, dip,
1538                                         nch->ncp->nc_name, nch->ncp->nc_nlen,
1539                                         nip);
1540
1541         /*
1542          * Finish up.
1543          */
1544         if (error) {
1545                 hammer_rel_inode(nip, 0);
1546                 *ap->a_vpp = NULL;
1547         } else {
1548                 error = hammer_get_vnode(nip, ap->a_vpp);
1549                 hammer_rel_inode(nip, 0);
1550                 if (error == 0) {
1551                         cache_setunresolved(ap->a_nch);
1552                         cache_setvp(ap->a_nch, *ap->a_vpp);
1553                 }
1554         }
1555         hammer_done_transaction(&trans);
1556         if (error == 0)
1557                 hammer_knote(ap->a_dvp, NOTE_WRITE);
1558         lwkt_reltoken(&hmp->fs_token);
1559         return (error);
1560 }
1561
1562 /*
1563  * hammer_vop_open { vp, mode, cred, fp }
1564  *
1565  * MPSAFE (does not require fs_token)
1566  */
1567 static
1568 int
1569 hammer_vop_open(struct vop_open_args *ap)
1570 {
1571         hammer_inode_t ip;
1572
1573         ++hammer_stats_file_iopsr;
1574         ip = VTOI(ap->a_vp);
1575
1576         if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO))
1577                 return (EROFS);
1578         return(vop_stdopen(ap));
1579 }
1580
1581 /*
1582  * hammer_vop_print { vp }
1583  */
1584 static
1585 int
1586 hammer_vop_print(struct vop_print_args *ap)
1587 {
1588         return EOPNOTSUPP;
1589 }
1590
1591 /*
1592  * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
1593  */
1594 static
1595 int
1596 hammer_vop_readdir(struct vop_readdir_args *ap)
1597 {
1598         struct hammer_transaction trans;
1599         struct hammer_cursor cursor;
1600         struct hammer_inode *ip;
1601         hammer_mount_t hmp;
1602         struct uio *uio;
1603         hammer_base_elm_t base;
1604         int error;
1605         int cookie_index;
1606         int ncookies;
1607         off_t *cookies;
1608         off_t saveoff;
1609         int r;
1610         int dtype;
1611
1612         ++hammer_stats_file_iopsr;
1613         ip = VTOI(ap->a_vp);
1614         uio = ap->a_uio;
1615         saveoff = uio->uio_offset;
1616         hmp = ip->hmp;
1617
1618         if (ap->a_ncookies) {
1619                 ncookies = uio->uio_resid / 16 + 1;
1620                 if (ncookies > 1024)
1621                         ncookies = 1024;
1622                 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
1623                 cookie_index = 0;
1624         } else {
1625                 ncookies = -1;
1626                 cookies = NULL;
1627                 cookie_index = 0;
1628         }
1629
1630         lwkt_gettoken(&hmp->fs_token);
1631         hammer_simple_transaction(&trans, hmp);
1632
1633         /*
1634          * Handle artificial entries
1635          *
1636          * It should be noted that the minimum value for a directory
1637          * hash key on-media is 0x0000000100000000, so we can use anything
1638          * less then that to represent our 'special' key space.
1639          */
1640         error = 0;
1641         if (saveoff == 0) {
1642                 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
1643                 if (r)
1644                         goto done;
1645                 if (cookies)
1646                         cookies[cookie_index] = saveoff;
1647                 ++saveoff;
1648                 ++cookie_index;
1649                 if (cookie_index == ncookies)
1650                         goto done;
1651         }
1652         if (saveoff == 1) {
1653                 if (ip->ino_data.parent_obj_id) {
1654                         r = vop_write_dirent(&error, uio,
1655                                              ip->ino_data.parent_obj_id,
1656                                              DT_DIR, 2, "..");
1657                 } else {
1658                         r = vop_write_dirent(&error, uio,
1659                                              ip->obj_id, DT_DIR, 2, "..");
1660                 }
1661                 if (r)
1662                         goto done;
1663                 if (cookies)
1664                         cookies[cookie_index] = saveoff;
1665                 ++saveoff;
1666                 ++cookie_index;
1667                 if (cookie_index == ncookies)
1668                         goto done;
1669         }
1670
1671         /*
1672          * Key range (begin and end inclusive) to scan.  Directory keys
1673          * directly translate to a 64 bit 'seek' position.
1674          */
1675         hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1676         cursor.key_beg.localization = ip->obj_localization +
1677                                       hammer_dir_localization(ip);
1678         cursor.key_beg.obj_id = ip->obj_id;
1679         cursor.key_beg.create_tid = 0;
1680         cursor.key_beg.delete_tid = 0;
1681         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1682         cursor.key_beg.obj_type = 0;
1683         cursor.key_beg.key = saveoff;
1684
1685         cursor.key_end = cursor.key_beg;
1686         cursor.key_end.key = HAMMER_MAX_KEY;
1687         cursor.asof = ip->obj_asof;
1688         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1689
1690         error = hammer_ip_first(&cursor);
1691
1692         while (error == 0) {
1693                 error = hammer_ip_resolve_data(&cursor);
1694                 if (error)
1695                         break;
1696                 base = &cursor.leaf->base;
1697                 saveoff = base->key;
1698                 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF);
1699
1700                 if (base->obj_id != ip->obj_id)
1701                         panic("readdir: bad record at %p", cursor.node);
1702
1703                 /*
1704                  * Convert pseudo-filesystems into softlinks
1705                  */
1706                 dtype = hammer_get_dtype(cursor.leaf->base.obj_type);
1707                 r = vop_write_dirent(
1708                              &error, uio, cursor.data->entry.obj_id,
1709                              dtype,
1710                              cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF ,
1711                              (void *)cursor.data->entry.name);
1712                 if (r)
1713                         break;
1714                 ++saveoff;
1715                 if (cookies)
1716                         cookies[cookie_index] = base->key;
1717                 ++cookie_index;
1718                 if (cookie_index == ncookies)
1719                         break;
1720                 error = hammer_ip_next(&cursor);
1721         }
1722         hammer_done_cursor(&cursor);
1723
1724 done:
1725         hammer_done_transaction(&trans);
1726
1727         if (ap->a_eofflag)
1728                 *ap->a_eofflag = (error == ENOENT);
1729         uio->uio_offset = saveoff;
1730         if (error && cookie_index == 0) {
1731                 if (error == ENOENT)
1732                         error = 0;
1733                 if (cookies) {
1734                         kfree(cookies, M_TEMP);
1735                         *ap->a_ncookies = 0;
1736                         *ap->a_cookies = NULL;
1737                 }
1738         } else {
1739                 if (error == ENOENT)
1740                         error = 0;
1741                 if (cookies) {
1742                         *ap->a_ncookies = cookie_index;
1743                         *ap->a_cookies = cookies;
1744                 }
1745         }
1746         lwkt_reltoken(&hmp->fs_token);
1747         return(error);
1748 }
1749
1750 /*
1751  * hammer_vop_readlink { vp, uio, cred }
1752  */
1753 static
1754 int
1755 hammer_vop_readlink(struct vop_readlink_args *ap)
1756 {
1757         struct hammer_transaction trans;
1758         struct hammer_cursor cursor;
1759         struct hammer_inode *ip;
1760         hammer_mount_t hmp;
1761         char buf[32];
1762         u_int32_t localization;
1763         hammer_pseudofs_inmem_t pfsm;
1764         int error;
1765
1766         ip = VTOI(ap->a_vp);
1767         hmp = ip->hmp;
1768
1769         lwkt_gettoken(&hmp->fs_token);
1770
1771         /*
1772          * Shortcut if the symlink data was stuffed into ino_data.
1773          *
1774          * Also expand special "@@PFS%05d" softlinks (expansion only
1775          * occurs for non-historical (current) accesses made from the
1776          * primary filesystem).
1777          */
1778         if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) {
1779                 char *ptr;
1780                 int bytes;
1781
1782                 ptr = ip->ino_data.ext.symlink;
1783                 bytes = (int)ip->ino_data.size;
1784                 if (bytes == 10 &&
1785                     ip->obj_asof == HAMMER_MAX_TID &&
1786                     ip->obj_localization == 0 &&
1787                     strncmp(ptr, "@@PFS", 5) == 0) {
1788                         hammer_simple_transaction(&trans, hmp);
1789                         bcopy(ptr + 5, buf, 5);
1790                         buf[5] = 0;
1791                         localization = strtoul(buf, NULL, 10) << 16;
1792                         pfsm = hammer_load_pseudofs(&trans, localization,
1793                                                     &error);
1794                         if (error == 0) {
1795                                 if (pfsm->pfsd.mirror_flags &
1796                                     HAMMER_PFSD_SLAVE) {
1797                                         /* vap->va_size == 26 */
1798                                         ksnprintf(buf, sizeof(buf),
1799                                                   "@@0x%016llx:%05d",
1800                                                   (long long)pfsm->pfsd.sync_end_tid,
1801                                                   localization >> 16);
1802                                 } else {
1803                                         /* vap->va_size == 10 */
1804                                         ksnprintf(buf, sizeof(buf),
1805                                                   "@@-1:%05d",
1806                                                   localization >> 16);
1807 #if 0
1808                                         ksnprintf(buf, sizeof(buf),
1809                                                   "@@0x%016llx:%05d",
1810                                                   (long long)HAMMER_MAX_TID,
1811                                                   localization >> 16);
1812 #endif
1813                                 }
1814                                 ptr = buf;
1815                                 bytes = strlen(buf);
1816                         }
1817                         if (pfsm)
1818                                 hammer_rel_pseudofs(hmp, pfsm);
1819                         hammer_done_transaction(&trans);
1820                 }
1821                 error = uiomove(ptr, bytes, ap->a_uio);
1822                 lwkt_reltoken(&hmp->fs_token);
1823                 return(error);
1824         }
1825
1826         /*
1827          * Long version
1828          */
1829         hammer_simple_transaction(&trans, hmp);
1830         ++hammer_stats_file_iopsr;
1831         hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1832
1833         /*
1834          * Key range (begin and end inclusive) to scan.  Directory keys
1835          * directly translate to a 64 bit 'seek' position.
1836          */
1837         cursor.key_beg.localization = ip->obj_localization +
1838                                       HAMMER_LOCALIZE_MISC;
1839         cursor.key_beg.obj_id = ip->obj_id;
1840         cursor.key_beg.create_tid = 0;
1841         cursor.key_beg.delete_tid = 0;
1842         cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1843         cursor.key_beg.obj_type = 0;
1844         cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1845         cursor.asof = ip->obj_asof;
1846         cursor.flags |= HAMMER_CURSOR_ASOF;
1847
1848         error = hammer_ip_lookup(&cursor);
1849         if (error == 0) {
1850                 error = hammer_ip_resolve_data(&cursor);
1851                 if (error == 0) {
1852                         KKASSERT(cursor.leaf->data_len >=
1853                                  HAMMER_SYMLINK_NAME_OFF);
1854                         error = uiomove(cursor.data->symlink.name,
1855                                         cursor.leaf->data_len -
1856                                                 HAMMER_SYMLINK_NAME_OFF,
1857                                         ap->a_uio);
1858                 }
1859         }
1860         hammer_done_cursor(&cursor);
1861         hammer_done_transaction(&trans);
1862         lwkt_reltoken(&hmp->fs_token);
1863         return(error);
1864 }
1865
1866 /*
1867  * hammer_vop_nremove { nch, dvp, cred }
1868  */
1869 static
1870 int
1871 hammer_vop_nremove(struct vop_nremove_args *ap)
1872 {
1873         struct hammer_transaction trans;
1874         struct hammer_inode *dip;
1875         hammer_mount_t hmp;
1876         int error;
1877
1878         dip = VTOI(ap->a_dvp);
1879         hmp = dip->hmp;
1880
1881         if (hammer_nohistory(dip) == 0 &&
1882             (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1883                 return (error);
1884         }
1885
1886         lwkt_gettoken(&hmp->fs_token);
1887         hammer_start_transaction(&trans, hmp);
1888         ++hammer_stats_file_iopsw;
1889         error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0);
1890         hammer_done_transaction(&trans);
1891         if (error == 0)
1892                 hammer_knote(ap->a_dvp, NOTE_WRITE);
1893         lwkt_reltoken(&hmp->fs_token);
1894         return (error);
1895 }
1896
1897 /*
1898  * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1899  */
1900 static
1901 int
1902 hammer_vop_nrename(struct vop_nrename_args *ap)
1903 {
1904         struct hammer_transaction trans;
1905         struct namecache *fncp;
1906         struct namecache *tncp;
1907         struct hammer_inode *fdip;
1908         struct hammer_inode *tdip;
1909         struct hammer_inode *ip;
1910         hammer_mount_t hmp;
1911         struct hammer_cursor cursor;
1912         int64_t namekey;
1913         u_int32_t max_iterations;
1914         int nlen, error;
1915
1916         if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) 
1917                 return(EXDEV);
1918         if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
1919                 return(EXDEV);
1920
1921         fdip = VTOI(ap->a_fdvp);
1922         tdip = VTOI(ap->a_tdvp);
1923         fncp = ap->a_fnch->ncp;
1924         tncp = ap->a_tnch->ncp;
1925         ip = VTOI(fncp->nc_vp);
1926         KKASSERT(ip != NULL);
1927
1928         hmp = ip->hmp;
1929
1930         if (fdip->obj_localization != tdip->obj_localization)
1931                 return(EXDEV);
1932         if (fdip->obj_localization != ip->obj_localization)
1933                 return(EXDEV);
1934
1935         if (fdip->flags & HAMMER_INODE_RO)
1936                 return (EROFS);
1937         if (tdip->flags & HAMMER_INODE_RO)
1938                 return (EROFS);
1939         if (ip->flags & HAMMER_INODE_RO)
1940                 return (EROFS);
1941         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1942                 return (error);
1943
1944         lwkt_gettoken(&hmp->fs_token);
1945         hammer_start_transaction(&trans, hmp);
1946         ++hammer_stats_file_iopsw;
1947
1948         /*
1949          * Remove tncp from the target directory and then link ip as
1950          * tncp. XXX pass trans to dounlink
1951          *
1952          * Force the inode sync-time to match the transaction so it is
1953          * in-sync with the creation of the target directory entry.
1954          */
1955         error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp,
1956                                 ap->a_cred, 0, -1);
1957         if (error == 0 || error == ENOENT) {
1958                 error = hammer_ip_add_directory(&trans, tdip,
1959                                                 tncp->nc_name, tncp->nc_nlen,
1960                                                 ip);
1961                 if (error == 0) {
1962                         ip->ino_data.parent_obj_id = tdip->obj_id;
1963                         ip->ino_data.ctime = trans.time;
1964                         hammer_modify_inode(&trans, ip, HAMMER_INODE_DDIRTY);
1965                 }
1966         }
1967         if (error)
1968                 goto failed; /* XXX */
1969
1970         /*
1971          * Locate the record in the originating directory and remove it.
1972          *
1973          * Calculate the namekey and setup the key range for the scan.  This
1974          * works kinda like a chained hash table where the lower 32 bits
1975          * of the namekey synthesize the chain.
1976          *
1977          * The key range is inclusive of both key_beg and key_end.
1978          */
1979         namekey = hammer_directory_namekey(fdip, fncp->nc_name, fncp->nc_nlen,
1980                                            &max_iterations);
1981 retry:
1982         hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip);
1983         cursor.key_beg.localization = fdip->obj_localization +
1984                                       hammer_dir_localization(fdip);
1985         cursor.key_beg.obj_id = fdip->obj_id;
1986         cursor.key_beg.key = namekey;
1987         cursor.key_beg.create_tid = 0;
1988         cursor.key_beg.delete_tid = 0;
1989         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1990         cursor.key_beg.obj_type = 0;
1991
1992         cursor.key_end = cursor.key_beg;
1993         cursor.key_end.key += max_iterations;
1994         cursor.asof = fdip->obj_asof;
1995         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1996
1997         /*
1998          * Scan all matching records (the chain), locate the one matching
1999          * the requested path component.
2000          *
2001          * The hammer_ip_*() functions merge in-memory records with on-disk
2002          * records for the purposes of the search.
2003          */
2004         error = hammer_ip_first(&cursor);
2005         while (error == 0) {
2006                 if (hammer_ip_resolve_data(&cursor) != 0)
2007                         break;
2008                 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
2009                 KKASSERT(nlen > 0);
2010                 if (fncp->nc_nlen == nlen &&
2011                     bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) {
2012                         break;
2013                 }
2014                 error = hammer_ip_next(&cursor);
2015         }
2016
2017         /*
2018          * If all is ok we have to get the inode so we can adjust nlinks.
2019          *
2020          * WARNING: hammer_ip_del_directory() may have to terminate the
2021          * cursor to avoid a recursion.  It's ok to call hammer_done_cursor()
2022          * twice.
2023          */
2024         if (error == 0)
2025                 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
2026
2027         /*
2028          * XXX A deadlock here will break rename's atomicy for the purposes
2029          * of crash recovery.
2030          */
2031         if (error == EDEADLK) {
2032                 hammer_done_cursor(&cursor);
2033                 goto retry;
2034         }
2035
2036         /*
2037          * Cleanup and tell the kernel that the rename succeeded.
2038          *
2039          * NOTE: ip->vp, if non-NULL, cannot be directly referenced
2040          *       without formally acquiring the vp since the vp might
2041          *       have zero refs on it, or in the middle of a reclaim,
2042          *       etc.
2043          */
2044         hammer_done_cursor(&cursor);
2045         if (error == 0) {
2046                 cache_rename(ap->a_fnch, ap->a_tnch);
2047                 hammer_knote(ap->a_fdvp, NOTE_WRITE);
2048                 hammer_knote(ap->a_tdvp, NOTE_WRITE);
2049                 while (ip->vp) {
2050                         struct vnode *vp;
2051
2052                         error = hammer_get_vnode(ip, &vp);
2053                         if (error == 0 && vp) {
2054                                 vn_unlock(vp);
2055                                 hammer_knote(ip->vp, NOTE_RENAME);
2056                                 vrele(vp);
2057                                 break;
2058                         }
2059                         kprintf("Debug: HAMMER ip/vp race2 avoided\n");
2060                 }
2061         }
2062
2063 failed:
2064         hammer_done_transaction(&trans);
2065         lwkt_reltoken(&hmp->fs_token);
2066         return (error);
2067 }
2068
2069 /*
2070  * hammer_vop_nrmdir { nch, dvp, cred }
2071  */
2072 static
2073 int
2074 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
2075 {
2076         struct hammer_transaction trans;
2077         struct hammer_inode *dip;
2078         hammer_mount_t hmp;
2079         int error;
2080
2081         dip = VTOI(ap->a_dvp);
2082         hmp = dip->hmp;
2083
2084         if (hammer_nohistory(dip) == 0 &&
2085             (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
2086                 return (error);
2087         }
2088
2089         lwkt_gettoken(&hmp->fs_token);
2090         hammer_start_transaction(&trans, hmp);
2091         ++hammer_stats_file_iopsw;
2092         error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1);
2093         hammer_done_transaction(&trans);
2094         if (error == 0)
2095                 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
2096         lwkt_reltoken(&hmp->fs_token);
2097         return (error);
2098 }
2099
2100 /*
2101  * hammer_vop_markatime { vp, cred }
2102  */
2103 static
2104 int
2105 hammer_vop_markatime(struct vop_markatime_args *ap)
2106 {
2107         struct hammer_transaction trans;
2108         struct hammer_inode *ip;
2109         hammer_mount_t hmp;
2110
2111         ip = VTOI(ap->a_vp);
2112         if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
2113                 return (EROFS);
2114         if (ip->flags & HAMMER_INODE_RO)
2115                 return (EROFS);
2116         hmp = ip->hmp;
2117         if (hmp->mp->mnt_flag & MNT_NOATIME)
2118                 return (0);
2119         lwkt_gettoken(&hmp->fs_token);
2120         hammer_start_transaction(&trans, hmp);
2121         ++hammer_stats_file_iopsw;
2122
2123         ip->ino_data.atime = trans.time;
2124         hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME);
2125         hammer_done_transaction(&trans);
2126         hammer_knote(ap->a_vp, NOTE_ATTRIB);
2127         lwkt_reltoken(&hmp->fs_token);
2128         return (0);
2129 }
2130
2131 /*
2132  * hammer_vop_setattr { vp, vap, cred }
2133  */
2134 static
2135 int
2136 hammer_vop_setattr(struct vop_setattr_args *ap)
2137 {
2138         struct hammer_transaction trans;
2139         struct hammer_inode *ip;
2140         struct vattr *vap;
2141         hammer_mount_t hmp;
2142         int modflags;
2143         int error;
2144         int truncating;
2145         int blksize;
2146         int kflags;
2147 #if 0
2148         int64_t aligned_size;
2149 #endif
2150         u_int32_t flags;
2151
2152         vap = ap->a_vap;
2153         ip = ap->a_vp->v_data;
2154         modflags = 0;
2155         kflags = 0;
2156         hmp = ip->hmp;
2157
2158         if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
2159                 return(EROFS);
2160         if (ip->flags & HAMMER_INODE_RO)
2161                 return (EROFS);
2162         if (hammer_nohistory(ip) == 0 &&
2163             (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
2164                 return (error);
2165         }
2166
2167         lwkt_gettoken(&hmp->fs_token);
2168         hammer_start_transaction(&trans, hmp);
2169         ++hammer_stats_file_iopsw;
2170         error = 0;
2171
2172         if (vap->va_flags != VNOVAL) {
2173                 flags = ip->ino_data.uflags;
2174                 error = vop_helper_setattr_flags(&flags, vap->va_flags,
2175                                          hammer_to_unix_xid(&ip->ino_data.uid),
2176                                          ap->a_cred);
2177                 if (error == 0) {
2178                         if (ip->ino_data.uflags != flags) {
2179                                 ip->ino_data.uflags = flags;
2180                                 ip->ino_data.ctime = trans.time;
2181                                 modflags |= HAMMER_INODE_DDIRTY;
2182                                 kflags |= NOTE_ATTRIB;
2183                         }
2184                         if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
2185                                 error = 0;
2186                                 goto done;
2187                         }
2188                 }
2189                 goto done;
2190         }
2191         if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
2192                 error = EPERM;
2193                 goto done;
2194         }
2195         if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
2196                 mode_t cur_mode = ip->ino_data.mode;
2197                 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
2198                 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
2199                 uuid_t uuid_uid;
2200                 uuid_t uuid_gid;
2201
2202                 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
2203                                          ap->a_cred,
2204                                          &cur_uid, &cur_gid, &cur_mode);
2205                 if (error == 0) {
2206                         hammer_guid_to_uuid(&uuid_uid, cur_uid);
2207                         hammer_guid_to_uuid(&uuid_gid, cur_gid);
2208                         if (bcmp(&uuid_uid, &ip->ino_data.uid,
2209                                  sizeof(uuid_uid)) ||
2210                             bcmp(&uuid_gid, &ip->ino_data.gid,
2211                                  sizeof(uuid_gid)) ||
2212                             ip->ino_data.mode != cur_mode
2213                         ) {
2214                                 ip->ino_data.uid = uuid_uid;
2215                                 ip->ino_data.gid = uuid_gid;
2216                                 ip->ino_data.mode = cur_mode;
2217                                 ip->ino_data.ctime = trans.time;
2218                                 modflags |= HAMMER_INODE_DDIRTY;
2219                         }
2220                         kflags |= NOTE_ATTRIB;
2221                 }
2222         }
2223         while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) {
2224                 switch(ap->a_vp->v_type) {
2225                 case VREG:
2226                         if (vap->va_size == ip->ino_data.size)
2227                                 break;
2228
2229                         /*
2230                          * Log the operation if in fast-fsync mode or if
2231                          * there are unterminated redo write records present.
2232                          *
2233                          * The second check is needed so the recovery code
2234                          * properly truncates write redos even if nominal
2235                          * REDO operations is turned off due to excessive
2236                          * writes, because the related records might be
2237                          * destroyed and never lay down a TERM_WRITE.
2238                          */
2239                         if ((ip->flags & HAMMER_INODE_REDO) ||
2240                             (ip->flags & HAMMER_INODE_RDIRTY)) {
2241                                 error = hammer_generate_redo(&trans, ip,
2242                                                              vap->va_size,
2243                                                              HAMMER_REDO_TRUNC,
2244                                                              NULL, 0);
2245                         }
2246                         blksize = hammer_blocksize(vap->va_size);
2247
2248                         /*
2249                          * XXX break atomicy, we can deadlock the backend
2250                          * if we do not release the lock.  Probably not a
2251                          * big deal here.
2252                          */
2253                         if (vap->va_size < ip->ino_data.size) {
2254                                 nvtruncbuf(ap->a_vp, vap->va_size,
2255                                            blksize,
2256                                            hammer_blockoff(vap->va_size));
2257                                 truncating = 1;
2258                                 kflags |= NOTE_WRITE;
2259                         } else {
2260                                 nvextendbuf(ap->a_vp,
2261                                             ip->ino_data.size,
2262                                             vap->va_size,
2263                                             hammer_blocksize(ip->ino_data.size),
2264                                             hammer_blocksize(vap->va_size),
2265                                             hammer_blockoff(ip->ino_data.size),
2266                                             hammer_blockoff(vap->va_size),
2267                                             0);
2268                                 truncating = 0;
2269                                 kflags |= NOTE_WRITE | NOTE_EXTEND;
2270                         }
2271                         ip->ino_data.size = vap->va_size;
2272                         ip->ino_data.mtime = trans.time;
2273                         /* XXX safe to use SDIRTY instead of DDIRTY here? */
2274                         modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY;
2275
2276                         /*
2277                          * On-media truncation is cached in the inode until
2278                          * the inode is synchronized.  We must immediately
2279                          * handle any frontend records.
2280                          */
2281                         if (truncating) {
2282                                 hammer_ip_frontend_trunc(ip, vap->va_size);
2283 #ifdef DEBUG_TRUNCATE
2284                                 if (HammerTruncIp == NULL)
2285                                         HammerTruncIp = ip;
2286 #endif
2287                                 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
2288                                         ip->flags |= HAMMER_INODE_TRUNCATED;
2289                                         ip->trunc_off = vap->va_size;
2290 #ifdef DEBUG_TRUNCATE
2291                                         if (ip == HammerTruncIp)
2292                                         kprintf("truncate1 %016llx\n",
2293                                                 (long long)ip->trunc_off);
2294 #endif
2295                                 } else if (ip->trunc_off > vap->va_size) {
2296                                         ip->trunc_off = vap->va_size;
2297 #ifdef DEBUG_TRUNCATE
2298                                         if (ip == HammerTruncIp)
2299                                         kprintf("truncate2 %016llx\n",
2300                                                 (long long)ip->trunc_off);
2301 #endif
2302                                 } else {
2303 #ifdef DEBUG_TRUNCATE
2304                                         if (ip == HammerTruncIp)
2305                                         kprintf("truncate3 %016llx (ignored)\n",
2306                                                 (long long)vap->va_size);
2307 #endif
2308                                 }
2309                         }
2310
2311 #if 0
2312                         /*
2313                          * When truncating, nvtruncbuf() may have cleaned out
2314                          * a portion of the last block on-disk in the buffer
2315                          * cache.  We must clean out any frontend records
2316                          * for blocks beyond the new last block.
2317                          */
2318                         aligned_size = (vap->va_size + (blksize - 1)) &
2319                                        ~(int64_t)(blksize - 1);
2320                         if (truncating && vap->va_size < aligned_size) {
2321                                 aligned_size -= blksize;
2322                                 hammer_ip_frontend_trunc(ip, aligned_size);
2323                         }
2324 #endif
2325                         break;
2326                 case VDATABASE:
2327                         if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
2328                                 ip->flags |= HAMMER_INODE_TRUNCATED;
2329                                 ip->trunc_off = vap->va_size;
2330                         } else if (ip->trunc_off > vap->va_size) {
2331                                 ip->trunc_off = vap->va_size;
2332                         }
2333                         hammer_ip_frontend_trunc(ip, vap->va_size);
2334                         ip->ino_data.size = vap->va_size;
2335                         ip->ino_data.mtime = trans.time;
2336                         modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY;
2337                         kflags |= NOTE_ATTRIB;
2338                         break;
2339                 default:
2340                         error = EINVAL;
2341                         goto done;
2342                 }
2343                 break;
2344         }
2345         if (vap->va_atime.tv_sec != VNOVAL) {
2346                 ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime);
2347                 modflags |= HAMMER_INODE_ATIME;
2348                 kflags |= NOTE_ATTRIB;
2349         }
2350         if (vap->va_mtime.tv_sec != VNOVAL) {
2351                 ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime);
2352                 modflags |= HAMMER_INODE_MTIME;
2353                 kflags |= NOTE_ATTRIB;
2354         }
2355         if (vap->va_mode != (mode_t)VNOVAL) {
2356                 mode_t   cur_mode = ip->ino_data.mode;
2357                 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
2358                 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
2359
2360                 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
2361                                          cur_uid, cur_gid, &cur_mode);
2362                 if (error == 0 && ip->ino_data.mode != cur_mode) {
2363                         ip->ino_data.mode = cur_mode;
2364                         ip->ino_data.ctime = trans.time;
2365                         modflags |= HAMMER_INODE_DDIRTY;
2366                         kflags |= NOTE_ATTRIB;
2367                 }
2368         }
2369 done:
2370         if (error == 0)
2371                 hammer_modify_inode(&trans, ip, modflags);
2372         hammer_done_transaction(&trans);
2373         hammer_knote(ap->a_vp, kflags);
2374         lwkt_reltoken(&hmp->fs_token);
2375         return (error);
2376 }
2377
2378 /*
2379  * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
2380  */
2381 static
2382 int
2383 hammer_vop_nsymlink(struct vop_nsymlink_args *ap)
2384 {
2385         struct hammer_transaction trans;
2386         struct hammer_inode *dip;
2387         struct hammer_inode *nip;
2388         hammer_record_t record;
2389         struct nchandle *nch;
2390         hammer_mount_t hmp;
2391         int error;
2392         int bytes;
2393
2394         ap->a_vap->va_type = VLNK;
2395
2396         nch = ap->a_nch;
2397         dip = VTOI(ap->a_dvp);
2398         hmp = dip->hmp;
2399
2400         if (dip->flags & HAMMER_INODE_RO)
2401                 return (EROFS);
2402         if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
2403                 return (error);
2404
2405         /*
2406          * Create a transaction to cover the operations we perform.
2407          */
2408         lwkt_gettoken(&hmp->fs_token);
2409         hammer_start_transaction(&trans, hmp);
2410         ++hammer_stats_file_iopsw;
2411
2412         /*
2413          * Create a new filesystem object of the requested type.  The
2414          * returned inode will be referenced but not locked.
2415          */
2416
2417         error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
2418                                     dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
2419                                     NULL, &nip);
2420         if (error) {
2421                 hammer_done_transaction(&trans);
2422                 *ap->a_vpp = NULL;
2423                 lwkt_reltoken(&hmp->fs_token);
2424                 return (error);
2425         }
2426
2427         /*
2428          * Add a record representing the symlink.  symlink stores the link
2429          * as pure data, not a string, and is no \0 terminated.
2430          */
2431         if (error == 0) {
2432                 bytes = strlen(ap->a_target);
2433
2434                 if (bytes <= HAMMER_INODE_BASESYMLEN) {
2435                         bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes);
2436                 } else {
2437                         record = hammer_alloc_mem_record(nip, bytes);
2438                         record->type = HAMMER_MEM_RECORD_GENERAL;
2439
2440                         record->leaf.base.localization = nip->obj_localization +
2441                                                          HAMMER_LOCALIZE_MISC;
2442                         record->leaf.base.key = HAMMER_FIXKEY_SYMLINK;
2443                         record->leaf.base.rec_type = HAMMER_RECTYPE_FIX;
2444                         record->leaf.data_len = bytes;
2445                         KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0);
2446                         bcopy(ap->a_target, record->data->symlink.name, bytes);
2447                         error = hammer_ip_add_record(&trans, record);
2448                 }
2449
2450                 /*
2451                  * Set the file size to the length of the link.
2452                  */
2453                 if (error == 0) {
2454                         nip->ino_data.size = bytes;
2455                         hammer_modify_inode(&trans, nip, HAMMER_INODE_DDIRTY);
2456                 }
2457         }
2458         if (error == 0)
2459                 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name,
2460                                                 nch->ncp->nc_nlen, nip);
2461
2462         /*
2463          * Finish up.
2464          */
2465         if (error) {
2466                 hammer_rel_inode(nip, 0);
2467                 *ap->a_vpp = NULL;
2468         } else {
2469                 error = hammer_get_vnode(nip, ap->a_vpp);
2470                 hammer_rel_inode(nip, 0);
2471                 if (error == 0) {
2472                         cache_setunresolved(ap->a_nch);
2473                         cache_setvp(ap->a_nch, *ap->a_vpp);
2474                         hammer_knote(ap->a_dvp, NOTE_WRITE);
2475                 }
2476         }
2477         hammer_done_transaction(&trans);
2478         lwkt_reltoken(&hmp->fs_token);
2479         return (error);
2480 }
2481
2482 /*
2483  * hammer_vop_nwhiteout { nch, dvp, cred, flags }
2484  */
2485 static
2486 int
2487 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap)
2488 {
2489         struct hammer_transaction trans;
2490         struct hammer_inode *dip;
2491         hammer_mount_t hmp;
2492         int error;
2493
2494         dip = VTOI(ap->a_dvp);
2495         hmp = dip->hmp;
2496
2497         if (hammer_nohistory(dip) == 0 &&
2498             (error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) {
2499                 return (error);
2500         }
2501
2502         lwkt_gettoken(&hmp->fs_token);
2503         hammer_start_transaction(&trans, hmp);
2504         ++hammer_stats_file_iopsw;
2505         error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp,
2506                                 ap->a_cred, ap->a_flags, -1);
2507         hammer_done_transaction(&trans);
2508         lwkt_reltoken(&hmp->fs_token);
2509
2510         return (error);
2511 }
2512
2513 /*
2514  * hammer_vop_ioctl { vp, command, data, fflag, cred }
2515  */
2516 static
2517 int
2518 hammer_vop_ioctl(struct vop_ioctl_args *ap)
2519 {
2520         struct hammer_inode *ip = ap->a_vp->v_data;
2521         hammer_mount_t hmp = ip->hmp;
2522         int error;
2523
2524         ++hammer_stats_file_iopsr;
2525         lwkt_gettoken(&hmp->fs_token);
2526         error = hammer_ioctl(ip, ap->a_command, ap->a_data,
2527                              ap->a_fflag, ap->a_cred);
2528         lwkt_reltoken(&hmp->fs_token);
2529         return (error);
2530 }
2531
2532 static
2533 int
2534 hammer_vop_mountctl(struct vop_mountctl_args *ap)
2535 {
2536         static const struct mountctl_opt extraopt[] = {
2537                 { HMNT_NOHISTORY,       "nohistory" },
2538                 { HMNT_MASTERID,        "master" },
2539                 { 0, NULL}
2540
2541         };
2542         struct hammer_mount *hmp;
2543         struct mount *mp;
2544         int usedbytes;
2545         int error;
2546
2547         error = 0;
2548         usedbytes = 0;
2549         mp = ap->a_head.a_ops->head.vv_mount;
2550         KKASSERT(mp->mnt_data != NULL);
2551         hmp = (struct hammer_mount *)mp->mnt_data;
2552
2553         lwkt_gettoken(&hmp->fs_token);
2554
2555         switch(ap->a_op) {
2556         case MOUNTCTL_SET_EXPORT:
2557                 if (ap->a_ctllen != sizeof(struct export_args))
2558                         error = EINVAL;
2559                 else
2560                         error = hammer_vfs_export(mp, ap->a_op,
2561                                       (const struct export_args *)ap->a_ctl);
2562                 break;
2563         case MOUNTCTL_MOUNTFLAGS:
2564         {
2565                 /*
2566                  * Call standard mountctl VOP function
2567                  * so we get user mount flags.
2568                  */
2569                 error = vop_stdmountctl(ap);
2570                 if (error)
2571                         break;
2572
2573                 usedbytes = *ap->a_res;
2574
2575                 if (usedbytes > 0 && usedbytes < ap->a_buflen) {
2576                         usedbytes += vfs_flagstostr(hmp->hflags, extraopt,
2577                                                     ap->a_buf,
2578                                                     ap->a_buflen - usedbytes,
2579                                                     &error);
2580                 }
2581
2582                 *ap->a_res += usedbytes;
2583                 break;
2584         }
2585         default:
2586                 error = vop_stdmountctl(ap);
2587                 break;
2588         }
2589         lwkt_reltoken(&hmp->fs_token);
2590         return(error);
2591 }
2592
2593 /*
2594  * hammer_vop_strategy { vp, bio }
2595  *
2596  * Strategy call, used for regular file read & write only.  Note that the
2597  * bp may represent a cluster.
2598  *
2599  * To simplify operation and allow better optimizations in the future,
2600  * this code does not make any assumptions with regards to buffer alignment
2601  * or size.
2602  */
2603 static
2604 int
2605 hammer_vop_strategy(struct vop_strategy_args *ap)
2606 {
2607         struct buf *bp;
2608         int error;
2609
2610         bp = ap->a_bio->bio_buf;
2611
2612         switch(bp->b_cmd) {
2613         case BUF_CMD_READ:
2614                 error = hammer_vop_strategy_read(ap);
2615                 break;
2616         case BUF_CMD_WRITE:
2617                 error = hammer_vop_strategy_write(ap);
2618                 break;
2619         default:
2620                 bp->b_error = error = EINVAL;
2621                 bp->b_flags |= B_ERROR;
2622                 biodone(ap->a_bio);
2623                 break;
2624         }
2625
2626         /* hammer_dump_dedup_cache(((hammer_inode_t)ap->a_vp->v_data)->hmp); */
2627
2628         return (error);
2629 }
2630
2631 /*
2632  * Read from a regular file.  Iterate the related records and fill in the
2633  * BIO/BUF.  Gaps are zero-filled.
2634  *
2635  * The support code in hammer_object.c should be used to deal with mixed
2636  * in-memory and on-disk records.
2637  *
2638  * NOTE: Can be called from the cluster code with an oversized buf.
2639  *
2640  * XXX atime update
2641  */
2642 static
2643 int
2644 hammer_vop_strategy_read(struct vop_strategy_args *ap)
2645 {
2646         struct hammer_transaction trans;
2647         struct hammer_inode *ip;
2648         struct hammer_inode *dip;
2649         hammer_mount_t hmp;
2650         struct hammer_cursor cursor;
2651         hammer_base_elm_t base;
2652         hammer_off_t disk_offset;
2653         struct bio *bio;
2654         struct bio *nbio;
2655         struct buf *bp;
2656         int64_t rec_offset;
2657         int64_t ran_end;
2658         int64_t tmp64;
2659         int error;
2660         int boff;
2661         int roff;
2662         int n;
2663
2664         bio = ap->a_bio;
2665         bp = bio->bio_buf;
2666         ip = ap->a_vp->v_data;
2667         hmp = ip->hmp;
2668
2669         /*
2670          * The zone-2 disk offset may have been set by the cluster code via
2671          * a BMAP operation, or else should be NOOFFSET.
2672          *
2673          * Checking the high bits for a match against zone-2 should suffice.
2674          */
2675         nbio = push_bio(bio);
2676         if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) ==
2677             HAMMER_ZONE_LARGE_DATA) {
2678                 lwkt_gettoken(&hmp->fs_token);
2679                 error = hammer_io_direct_read(hmp, nbio, NULL);
2680                 lwkt_reltoken(&hmp->fs_token);
2681                 return (error);
2682         }
2683
2684         /*
2685          * Well, that sucked.  Do it the hard way.  If all the stars are
2686          * aligned we may still be able to issue a direct-read.
2687          */
2688         lwkt_gettoken(&hmp->fs_token);
2689         hammer_simple_transaction(&trans, hmp);
2690         hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2691
2692         /*
2693          * Key range (begin and end inclusive) to scan.  Note that the key's
2694          * stored in the actual records represent BASE+LEN, not BASE.  The
2695          * first record containing bio_offset will have a key > bio_offset.
2696          */
2697         cursor.key_beg.localization = ip->obj_localization +
2698                                       HAMMER_LOCALIZE_MISC;
2699         cursor.key_beg.obj_id = ip->obj_id;
2700         cursor.key_beg.create_tid = 0;
2701         cursor.key_beg.delete_tid = 0;
2702         cursor.key_beg.obj_type = 0;
2703         cursor.key_beg.key = bio->bio_offset + 1;
2704         cursor.asof = ip->obj_asof;
2705         cursor.flags |= HAMMER_CURSOR_ASOF;
2706
2707         cursor.key_end = cursor.key_beg;
2708         KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2709 #if 0
2710         if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) {
2711                 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
2712                 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
2713                 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2714         } else
2715 #endif
2716         {
2717                 ran_end = bio->bio_offset + bp->b_bufsize;
2718                 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2719                 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2720                 tmp64 = ran_end + MAXPHYS + 1;  /* work-around GCC-4 bug */
2721                 if (tmp64 < ran_end)
2722                         cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2723                 else
2724                         cursor.key_end.key = ran_end + MAXPHYS + 1;
2725         }
2726         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2727
2728         error = hammer_ip_first(&cursor);
2729         boff = 0;
2730
2731         while (error == 0) {
2732                 /*
2733                  * Get the base file offset of the record.  The key for
2734                  * data records is (base + bytes) rather then (base).
2735                  */
2736                 base = &cursor.leaf->base;
2737                 rec_offset = base->key - cursor.leaf->data_len;
2738
2739                 /*
2740                  * Calculate the gap, if any, and zero-fill it.
2741                  *
2742                  * n is the offset of the start of the record verses our
2743                  * current seek offset in the bio.
2744                  */
2745                 n = (int)(rec_offset - (bio->bio_offset + boff));
2746                 if (n > 0) {
2747                         if (n > bp->b_bufsize - boff)
2748                                 n = bp->b_bufsize - boff;
2749                         bzero((char *)bp->b_data + boff, n);
2750                         boff += n;
2751                         n = 0;
2752                 }
2753
2754                 /*
2755                  * Calculate the data offset in the record and the number
2756                  * of bytes we can copy.
2757                  *
2758                  * There are two degenerate cases.  First, boff may already
2759                  * be at bp->b_bufsize.  Secondly, the data offset within
2760                  * the record may exceed the record's size.
2761                  */
2762                 roff = -n;
2763                 rec_offset += roff;
2764                 n = cursor.leaf->data_len - roff;
2765                 if (n <= 0) {
2766                         kprintf("strategy_read: bad n=%d roff=%d\n", n, roff);
2767                         n = 0;
2768                 } else if (n > bp->b_bufsize - boff) {
2769                         n = bp->b_bufsize - boff;
2770                 }
2771
2772                 /*
2773                  * Deal with cached truncations.  This cool bit of code
2774                  * allows truncate()/ftruncate() to avoid having to sync
2775                  * the file.
2776                  *
2777                  * If the frontend is truncated then all backend records are
2778                  * subject to the frontend's truncation.
2779                  *
2780                  * If the backend is truncated then backend records on-disk
2781                  * (but not in-memory) are subject to the backend's
2782                  * truncation.  In-memory records owned by the backend
2783                  * represent data written after the truncation point on the
2784                  * backend and must not be truncated.
2785                  *
2786                  * Truncate operations deal with frontend buffer cache
2787                  * buffers and frontend-owned in-memory records synchronously.
2788                  */
2789                 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2790                         if (hammer_cursor_ondisk(&cursor)/* ||
2791                             cursor.iprec->flush_state == HAMMER_FST_FLUSH*/) {
2792                                 if (ip->trunc_off <= rec_offset)
2793                                         n = 0;
2794                                 else if (ip->trunc_off < rec_offset + n)
2795                                         n = (int)(ip->trunc_off - rec_offset);
2796                         }
2797                 }
2798                 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2799                         if (hammer_cursor_ondisk(&cursor)) {
2800                                 if (ip->sync_trunc_off <= rec_offset)
2801                                         n = 0;
2802                                 else if (ip->sync_trunc_off < rec_offset + n)
2803                                         n = (int)(ip->sync_trunc_off - rec_offset);
2804                         }
2805                 }
2806
2807                 /*
2808                  * Try to issue a direct read into our bio if possible,
2809                  * otherwise resolve the element data into a hammer_buffer
2810                  * and copy.
2811                  *
2812                  * The buffer on-disk should be zerod past any real
2813                  * truncation point, but may not be for any synthesized
2814                  * truncation point from above.
2815                  */
2816                 disk_offset = cursor.leaf->data_offset + roff;
2817                 if (boff == 0 && n == bp->b_bufsize &&
2818                     hammer_cursor_ondisk(&cursor) &&
2819                     (disk_offset & HAMMER_BUFMASK) == 0) {
2820                         KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) ==
2821                                  HAMMER_ZONE_LARGE_DATA);
2822                         nbio->bio_offset = disk_offset;
2823                         error = hammer_io_direct_read(hmp, nbio, cursor.leaf);
2824                         if (hammer_live_dedup)
2825                                 hammer_dedup_cache_add(ip, cursor.leaf);
2826                         goto done;
2827                 } else if (n) {
2828                         error = hammer_ip_resolve_data(&cursor);
2829                         if (error == 0) {
2830                                 bcopy((char *)cursor.data + roff,
2831                                       (char *)bp->b_data + boff, n);
2832                         }
2833                 }
2834                 if (error)
2835                         break;
2836
2837                 /*
2838                  * We have to be sure that the only elements added to the
2839                  * dedup cache are those which are already on-media.
2840                  */
2841                 if (hammer_live_dedup && hammer_cursor_ondisk(&cursor))
2842                         hammer_dedup_cache_add(ip, cursor.leaf);
2843
2844                 /*
2845                  * Iterate until we have filled the request.
2846                  */
2847                 boff += n;
2848                 if (boff == bp->b_bufsize)
2849                         break;
2850                 error = hammer_ip_next(&cursor);
2851         }
2852
2853         /*
2854          * There may have been a gap after the last record
2855          */
2856         if (error == ENOENT)
2857                 error = 0;
2858         if (error == 0 && boff != bp->b_bufsize) {
2859                 KKASSERT(boff < bp->b_bufsize);
2860                 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
2861                 /* boff = bp->b_bufsize; */
2862         }
2863         bp->b_resid = 0;
2864         bp->b_error = error;
2865         if (error)
2866                 bp->b_flags |= B_ERROR;
2867         biodone(ap->a_bio);
2868
2869 done:
2870         /*
2871          * Cache the b-tree node for the last data read in cache[1].
2872          *
2873          * If we hit the file EOF then also cache the node in the
2874          * governing director's cache[3], it will be used to initialize
2875          * the inode's cache[1] for any inodes looked up via the directory.
2876          *
2877          * This doesn't reduce disk accesses since the B-Tree chain is
2878          * likely cached, but it does reduce cpu overhead when looking
2879          * up file offsets for cpdup/tar/cpio style iterations.
2880          */
2881         if (cursor.node)
2882                 hammer_cache_node(&ip->cache[1], cursor.node);
2883         if (ran_end >= ip->ino_data.size) {
2884                 dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id,
2885                                         ip->obj_asof, ip->obj_localization);
2886                 if (dip) {
2887                         hammer_cache_node(&dip->cache[3], cursor.node);
2888                         hammer_rel_inode(dip, 0);
2889                 }
2890         }
2891         hammer_done_cursor(&cursor);
2892         hammer_done_transaction(&trans);
2893         lwkt_reltoken(&hmp->fs_token);
2894         return(error);
2895 }
2896
2897 /*
2898  * BMAP operation - used to support cluster_read() only.
2899  *
2900  * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb)
2901  *
2902  * This routine may return EOPNOTSUPP if the opration is not supported for
2903  * the specified offset.  The contents of the pointer arguments do not
2904  * need to be initialized in that case. 
2905  *
2906  * If a disk address is available and properly aligned return 0 with 
2907  * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately
2908  * to the run-length relative to that offset.  Callers may assume that
2909  * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently
2910  * large, so return EOPNOTSUPP if it is not sufficiently large.
2911  */
2912 static
2913 int
2914 hammer_vop_bmap(struct vop_bmap_args *ap)
2915 {
2916         struct hammer_transaction trans;
2917         struct hammer_inode *ip;
2918         hammer_mount_t hmp;
2919         struct hammer_cursor cursor;
2920         hammer_base_elm_t base;
2921         int64_t rec_offset;
2922         int64_t ran_end;
2923         int64_t tmp64;
2924         int64_t base_offset;
2925         int64_t base_disk_offset;
2926         int64_t last_offset;
2927         hammer_off_t last_disk_offset;
2928         hammer_off_t disk_offset;
2929         int     rec_len;
2930         int     error;
2931         int     blksize;
2932
2933         ++hammer_stats_file_iopsr;
2934         ip = ap->a_vp->v_data;
2935         hmp = ip->hmp;
2936
2937         /*
2938          * We can only BMAP regular files.  We can't BMAP database files,
2939          * directories, etc.
2940          */
2941         if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE)
2942                 return(EOPNOTSUPP);
2943
2944         /*
2945          * bmap is typically called with runp/runb both NULL when used
2946          * for writing.  We do not support BMAP for writing atm.
2947          */
2948         if (ap->a_cmd != BUF_CMD_READ)
2949                 return(EOPNOTSUPP);
2950
2951         /*
2952          * Scan the B-Tree to acquire blockmap addresses, then translate
2953          * to raw addresses.
2954          */
2955         lwkt_gettoken(&hmp->fs_token);
2956         hammer_simple_transaction(&trans, hmp);
2957 #if 0
2958         kprintf("bmap_beg %016llx ip->cache %p\n",
2959                 (long long)ap->a_loffset, ip->cache[1]);
2960 #endif
2961         hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2962
2963         /*
2964          * Key range (begin and end inclusive) to scan.  Note that the key's
2965          * stored in the actual records represent BASE+LEN, not BASE.  The
2966          * first record containing bio_offset will have a key > bio_offset.
2967          */
2968         cursor.key_beg.localization = ip->obj_localization +
2969                                       HAMMER_LOCALIZE_MISC;
2970         cursor.key_beg.obj_id = ip->obj_id;
2971         cursor.key_beg.create_tid = 0;
2972         cursor.key_beg.delete_tid = 0;
2973         cursor.key_beg.obj_type = 0;
2974         if (ap->a_runb)
2975                 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1;
2976         else
2977                 cursor.key_beg.key = ap->a_loffset + 1;
2978         if (cursor.key_beg.key < 0)
2979                 cursor.key_beg.key = 0;
2980         cursor.asof = ip->obj_asof;
2981         cursor.flags |= HAMMER_CURSOR_ASOF;
2982
2983         cursor.key_end = cursor.key_beg;
2984         KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2985
2986         ran_end = ap->a_loffset + MAXPHYS;
2987         cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2988         cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2989         tmp64 = ran_end + MAXPHYS + 1;  /* work-around GCC-4 bug */
2990         if (tmp64 < ran_end)
2991                 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2992         else
2993                 cursor.key_end.key = ran_end + MAXPHYS + 1;
2994
2995         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2996
2997         error = hammer_ip_first(&cursor);
2998         base_offset = last_offset = 0;
2999         base_disk_offset = last_disk_offset = 0;
3000
3001         while (error == 0) {
3002                 /*
3003                  * Get the base file offset of the record.  The key for
3004                  * data records is (base + bytes) rather then (base).
3005                  *
3006                  * NOTE: rec_offset + rec_len may exceed the end-of-file.
3007                  * The extra bytes should be zero on-disk and the BMAP op
3008                  * should still be ok.
3009                  */
3010                 base = &cursor.leaf->base;
3011                 rec_offset = base->key - cursor.leaf->data_len;
3012                 rec_len    = cursor.leaf->data_len;
3013
3014                 /*
3015                  * Incorporate any cached truncation.
3016                  *
3017                  * NOTE: Modifications to rec_len based on synthesized
3018                  * truncation points remove the guarantee that any extended
3019                  * data on disk is zero (since the truncations may not have
3020                  * taken place on-media yet).
3021                  */
3022                 if (ip->flags & HAMMER_INODE_TRUNCATED) {
3023                         if (hammer_cursor_ondisk(&cursor) ||
3024                             cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
3025                                 if (ip->trunc_off <= rec_offset)
3026                                         rec_len = 0;
3027                                 else if (ip->trunc_off < rec_offset + rec_len)
3028                                         rec_len = (int)(ip->trunc_off - rec_offset);
3029                         }
3030                 }
3031                 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
3032                         if (hammer_cursor_ondisk(&cursor)) {
3033                                 if (ip->sync_trunc_off <= rec_offset)
3034                                         rec_len = 0;
3035                                 else if (ip->sync_trunc_off < rec_offset + rec_len)
3036                                         rec_len = (int)(ip->sync_trunc_off - rec_offset);
3037                         }
3038                 }
3039
3040                 /*
3041                  * Accumulate information.  If we have hit a discontiguous
3042                  * block reset base_offset unless we are already beyond the
3043                  * requested offset.  If we are, that's it, we stop.
3044                  */
3045                 if (error)
3046                         break;
3047                 if (hammer_cursor_ondisk(&cursor)) {
3048                         disk_offset = cursor.leaf->data_offset;
3049                         if (rec_offset != last_offset ||
3050                             disk_offset != last_disk_offset) {
3051                                 if (rec_offset > ap->a_loffset)
3052                                         break;
3053                                 base_offset = rec_offset;
3054                                 base_disk_offset = disk_offset;
3055                         }
3056                         last_offset = rec_offset + rec_len;
3057                         last_disk_offset = disk_offset + rec_len;
3058
3059                         if (hammer_live_dedup)
3060                                 hammer_dedup_cache_add(ip, cursor.leaf);
3061                 }
3062                 
3063                 error = hammer_ip_next(&cursor);
3064         }
3065
3066 #if 0
3067         kprintf("BMAP %016llx:  %016llx - %016llx\n",
3068                 (long long)ap->a_loffset,
3069                 (long long)base_offset,
3070                 (long long)last_offset);
3071         kprintf("BMAP %16s:  %016llx - %016llx\n", "",
3072                 (long long)base_disk_offset,
3073                 (long long)last_disk_offset);
3074 #endif
3075
3076         if (cursor.node) {
3077                 hammer_cache_node(&ip->cache[1], cursor.node);
3078 #if 0
3079                 kprintf("bmap_end2 %016llx ip->cache %p\n",
3080                         (long long)ap->a_loffset, ip->cache[1]);
3081 #endif
3082         }
3083         hammer_done_cursor(&cursor);
3084         hammer_done_transaction(&trans);
3085         lwkt_reltoken(&hmp->fs_token);
3086
3087         /*
3088          * If we couldn't find any records or the records we did find were
3089          * all behind the requested offset, return failure.  A forward
3090          * truncation can leave a hole w/ no on-disk records.
3091          */
3092         if (last_offset == 0 || last_offset < ap->a_loffset)
3093                 return (EOPNOTSUPP);
3094
3095         /*
3096          * Figure out the block size at the requested offset and adjust
3097          * our limits so the cluster_read() does not create inappropriately
3098          * sized buffer cache buffers.
3099          */
3100         blksize = hammer_blocksize(ap->a_loffset);
3101         if (hammer_blocksize(base_offset) != blksize) {
3102                 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset);
3103         }
3104         if (last_offset != ap->a_loffset &&
3105             hammer_blocksize(last_offset - 1) != blksize) {
3106                 last_offset = hammer_blockdemarc(ap->a_loffset,
3107                                                  last_offset - 1);
3108         }
3109
3110         /*
3111          * Returning EOPNOTSUPP simply prevents the direct-IO optimization
3112          * from occuring.
3113          */
3114         disk_offset = base_disk_offset + (ap->a_loffset - base_offset);
3115
3116         if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) {
3117                 /*
3118                  * Only large-data zones can be direct-IOd
3119                  */
3120                 error = EOPNOTSUPP;
3121         } else if ((disk_offset & HAMMER_BUFMASK) ||
3122                    (last_offset - ap->a_loffset) < blksize) {
3123                 /*
3124                  * doffsetp is not aligned or the forward run size does
3125                  * not cover a whole buffer, disallow the direct I/O.
3126                  */
3127                 error = EOPNOTSUPP;
3128         } else {
3129                 /*
3130                  * We're good.
3131                  */
3132                 *ap->a_doffsetp = disk_offset;
3133                 if (ap->a_runb) {
3134                         *ap->a_runb = ap->a_loffset - base_offset;
3135                         KKASSERT(*ap->a_runb >= 0);
3136                 }
3137                 if (ap->a_runp) {
3138                         *ap->a_runp = last_offset - ap->a_loffset;
3139                         KKASSERT(*ap->a_runp >= 0);
3140                 }
3141                 error = 0;
3142         }
3143         return(error);
3144 }
3145
3146 /*
3147  * Write to a regular file.   Because this is a strategy call the OS is
3148  * trying to actually get data onto the media.
3149  */
3150 static
3151 int
3152 hammer_vop_strategy_write(struct vop_strategy_args *ap)
3153 {
3154         hammer_record_t record;
3155         hammer_mount_t hmp;
3156         hammer_inode_t ip;
3157         struct bio *bio;
3158         struct buf *bp;
3159         int blksize;
3160         int bytes;
3161         int error;
3162
3163         bio = ap->a_bio;
3164         bp = bio->bio_buf;
3165         ip = ap->a_vp->v_data;
3166         hmp = ip->hmp;
3167
3168         blksize = hammer_blocksize(bio->bio_offset);
3169         KKASSERT(bp->b_bufsize == blksize);
3170
3171         if (ip->flags & HAMMER_INODE_RO) {
3172                 bp->b_error = EROFS;
3173                 bp->b_flags |= B_ERROR;
3174                 biodone(ap->a_bio);
3175                 return(EROFS);
3176         }
3177
3178         lwkt_gettoken(&hmp->fs_token);
3179
3180         /*
3181          * Interlock with inode destruction (no in-kernel or directory
3182          * topology visibility).  If we queue new IO while trying to
3183          * destroy the inode we can deadlock the vtrunc call in
3184          * hammer_inode_unloadable_check().
3185          *
3186          * Besides, there's no point flushing a bp associated with an
3187          * inode that is being destroyed on-media and has no kernel
3188          * references.
3189          */
3190         if ((ip->flags | ip->sync_flags) &
3191             (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) {
3192                 bp->b_resid = 0;
3193                 biodone(ap->a_bio);
3194                 lwkt_reltoken(&hmp->fs_token);
3195                 return(0);
3196         }
3197
3198         /*
3199          * Reserve space and issue a direct-write from the front-end. 
3200          * NOTE: The direct_io code will hammer_bread/bcopy smaller
3201          * allocations.
3202          *
3203          * An in-memory record will be installed to reference the storage
3204          * until the flusher can get to it.
3205          *
3206          * Since we own the high level bio the front-end will not try to
3207          * do a direct-read until the write completes.
3208          *
3209          * NOTE: The only time we do not reserve a full-sized buffers
3210          * worth of data is if the file is small.  We do not try to
3211          * allocate a fragment (from the small-data zone) at the end of
3212          * an otherwise large file as this can lead to wildly separated
3213          * data.
3214          */
3215         KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0);
3216         KKASSERT(bio->bio_offset < ip->ino_data.size);
3217         if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2)
3218                 bytes = bp->b_bufsize;
3219         else
3220                 bytes = ((int)ip->ino_data.size + 15) & ~15;
3221
3222         record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data,
3223                                     bytes, &error);
3224
3225         /*
3226          * B_VFSFLAG1 indicates that a REDO_WRITE entry was generated
3227          * in hammer_vop_write().  We must flag the record so the proper
3228          * REDO_TERM_WRITE entry is generated during the flush.
3229          */
3230         if (record) {
3231                 if (bp->b_flags & B_VFSFLAG1) {
3232                         record->flags |= HAMMER_RECF_REDO;
3233                         bp->b_flags &= ~B_VFSFLAG1;
3234                 }
3235                 if (record->flags & HAMMER_RECF_DEDUPED) {
3236                         bp->b_resid = 0;
3237                         hammer_ip_replace_bulk(hmp, record);
3238                         biodone(ap->a_bio);
3239                 } else {
3240                         hammer_io_direct_write(hmp, bio, record);
3241                 }
3242                 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs)
3243                         hammer_flush_inode(ip, 0);
3244         } else {
3245                 bp->b_bio2.bio_offset = NOOFFSET;
3246                 bp->b_error = error;
3247                 bp->b_flags |= B_ERROR;
3248                 biodone(ap->a_bio);
3249         }
3250         lwkt_reltoken(&hmp->fs_token);
3251         return(error);
3252 }
3253
3254 /*
3255  * dounlink - disconnect a directory entry
3256  *
3257  * XXX whiteout support not really in yet
3258  */
3259 static int
3260 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
3261                 struct vnode *dvp, struct ucred *cred, 
3262                 int flags, int isdir)
3263 {
3264         struct namecache *ncp;
3265         hammer_inode_t dip;
3266         hammer_inode_t ip;
3267         hammer_mount_t hmp;
3268         struct hammer_cursor cursor;
3269         int64_t namekey;
3270         u_int32_t max_iterations;
3271         int nlen, error;
3272
3273         /*
3274          * Calculate the namekey and setup the key range for the scan.  This
3275          * works kinda like a chained hash table where the lower 32 bits
3276          * of the namekey synthesize the chain.
3277          *
3278          * The key range is inclusive of both key_beg and key_end.
3279          */
3280         dip = VTOI(dvp);
3281         ncp = nch->ncp;
3282         hmp = dip->hmp;
3283
3284         if (dip->flags & HAMMER_INODE_RO)
3285                 return (EROFS);
3286
3287         namekey = hammer_directory_namekey(dip, ncp->nc_name, ncp->nc_nlen,
3288                                            &max_iterations);
3289 retry:
3290         hammer_init_cursor(trans, &cursor, &dip->cache[1], dip);
3291         cursor.key_beg.localization = dip->obj_localization +
3292                                       hammer_dir_localization(dip);
3293         cursor.key_beg.obj_id = dip->obj_id;
3294         cursor.key_beg.key = namekey;
3295         cursor.key_beg.create_tid = 0;
3296         cursor.key_beg.delete_tid = 0;
3297         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
3298         cursor.key_beg.obj_type = 0;
3299
3300         cursor.key_end = cursor.key_beg;
3301         cursor.key_end.key += max_iterations;
3302         cursor.asof = dip->obj_asof;
3303         cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
3304
3305         /*
3306          * Scan all matching records (the chain), locate the one matching
3307          * the requested path component.  info->last_error contains the
3308          * error code on search termination and could be 0, ENOENT, or
3309          * something else.
3310          *
3311          * The hammer_ip_*() functions merge in-memory records with on-disk
3312          * records for the purposes of the search.
3313          */
3314         error = hammer_ip_first(&cursor);
3315
3316         while (error == 0) {
3317                 error = hammer_ip_resolve_data(&cursor);
3318                 if (error)
3319                         break;
3320                 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
3321                 KKASSERT(nlen > 0);
3322                 if (ncp->nc_nlen == nlen &&
3323                     bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
3324                         break;
3325                 }
3326                 error = hammer_ip_next(&cursor);
3327         }
3328
3329         /*
3330          * If all is ok we have to get the inode so we can adjust nlinks.
3331          * To avoid a deadlock with the flusher we must release the inode
3332          * lock on the directory when acquiring the inode for the entry.
3333          *
3334          * If the target is a directory, it must be empty.
3335          */
3336         if (error == 0) {
3337                 hammer_unlock(&cursor.ip->lock);
3338                 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id,
3339                                       hmp->asof,
3340                                       cursor.data->entry.localization,
3341                                       0, &error);
3342                 hammer_lock_sh(&cursor.ip->lock);
3343                 if (error == ENOENT) {
3344                         kprintf("HAMMER: WARNING: Removing "
3345                                 "dirent w/missing inode \"%s\"\n"
3346                                 "\tobj_id = %016llx\n",
3347                                 ncp->nc_name,
3348                                 (long long)cursor.data->entry.obj_id);
3349                         error = 0;
3350                 }
3351
3352                 /*
3353                  * If isdir >= 0 we validate that the entry is or is not a
3354                  * directory.  If isdir < 0 we don't care.
3355                  */
3356                 if (error == 0 && isdir >= 0 && ip) {
3357                         if (isdir &&
3358                             ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) {
3359                                 error = ENOTDIR;
3360                         } else if (isdir == 0 &&
3361                             ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
3362                                 error = EISDIR;
3363                         }
3364                 }
3365
3366                 /*
3367                  * If we are trying to remove a directory the directory must
3368                  * be empty.
3369                  *
3370                  * The check directory code can loop and deadlock/retry.  Our
3371                  * own cursor's node locks must be released to avoid a 3-way
3372                  * deadlock with the flusher if the check directory code
3373                  * blocks.
3374                  *
3375                  * If any changes whatsoever have been made to the cursor
3376                  * set EDEADLK and retry.
3377                  *
3378                  * WARNING: See warnings in hammer_unlock_cursor()
3379                  *          function.
3380                  */
3381                 if (error == 0 && ip && ip->ino_data.obj_type ==
3382                                         HAMMER_OBJTYPE_DIRECTORY) {
3383                         hammer_unlock_cursor(&cursor);
3384                         error = hammer_ip_check_directory_empty(trans, ip);
3385                         hammer_lock_cursor(&cursor);
3386                         if (cursor.flags & HAMMER_CURSOR_RETEST) {
3387                                 kprintf("HAMMER: Warning: avoided deadlock "
3388                                         "on rmdir '%s'\n",
3389                                         ncp->nc_name);
3390                                 error = EDEADLK;
3391                         }
3392                 }
3393
3394                 /*
3395                  * Delete the directory entry.
3396                  *
3397                  * WARNING: hammer_ip_del_directory() may have to terminate
3398                  * the cursor to avoid a deadlock.  It is ok to call
3399                  * hammer_done_cursor() twice.
3400                  */
3401                 if (error == 0) {
3402                         error = hammer_ip_del_directory(trans, &cursor,
3403                                                         dip, ip);
3404                 }
3405                 hammer_done_cursor(&cursor);
3406                 if (error == 0) {
3407                         cache_setunresolved(nch);
3408                         cache_setvp(nch, NULL);
3409
3410                         /*
3411                          * NOTE: ip->vp, if non-NULL, cannot be directly
3412                          *       referenced without formally acquiring the
3413                          *       vp since the vp might have zero refs on it,
3414                          *       or in the middle of a reclaim, etc.
3415                          *
3416                          * NOTE: The cache_setunresolved() can rip the vp
3417                          *       out from under us since the vp may not have
3418                          *       any refs, in which case ip->vp will be NULL
3419                          *       from the outset.
3420                          */
3421                         while (ip && ip->vp) {
3422                                 struct vnode *vp;
3423
3424                                 error = hammer_get_vnode(ip, &vp);
3425                                 if (error == 0 && vp) {
3426                                         vn_unlock(vp);
3427                                         hammer_knote(ip->vp, NOTE_DELETE);
3428                                         cache_inval_vp(ip->vp, CINV_DESTROY);
3429                                         vrele(vp);
3430                                         break;
3431                                 }
3432                                 kprintf("Debug: HAMMER ip/vp race1 avoided\n");
3433                         }
3434                 }
3435                 if (ip)
3436                         hammer_rel_inode(ip, 0);
3437         } else {
3438                 hammer_done_cursor(&cursor);
3439         }
3440         if (error == EDEADLK)
3441                 goto retry;
3442
3443         return (error);
3444 }
3445
3446 /************************************************************************
3447  *                          FIFO AND SPECFS OPS                         *
3448  ************************************************************************
3449  *
3450  */
3451 static int
3452 hammer_vop_fifoclose (struct vop_close_args *ap)
3453 {
3454         /* XXX update itimes */
3455         return (VOCALL(&fifo_vnode_vops, &ap->a_head));
3456 }
3457
3458 static int
3459 hammer_vop_fiforead (struct vop_read_args *ap)
3460 {
3461         int error;
3462
3463         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
3464         /* XXX update access time */
3465         return (error);
3466 }
3467
3468 static int
3469 hammer_vop_fifowrite (struct vop_write_args *ap)
3470 {
3471         int error;
3472
3473         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
3474         /* XXX update access time */
3475         return (error);
3476 }
3477
3478 static
3479 int
3480 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap)
3481 {
3482         int error;
3483
3484         error = VOCALL(&fifo_vnode_vops, &ap->a_head);
3485         if (error)
3486                 error = hammer_vop_kqfilter(ap);
3487         return(error);
3488 }
3489
3490 /************************************************************************
3491  *                          KQFILTER OPS                                *
3492  ************************************************************************
3493  *
3494  */
3495 static void filt_hammerdetach(struct knote *kn);
3496 static int filt_hammerread(struct knote *kn, long hint);
3497 static int filt_hammerwrite(struct knote *kn, long hint);
3498 static int filt_hammervnode(struct knote *kn, long hint);
3499
3500 static struct filterops hammerread_filtops =
3501         { FILTEROP_ISFD, NULL, filt_hammerdetach, filt_hammerread };
3502 static struct filterops hammerwrite_filtops =
3503         { FILTEROP_ISFD, NULL, filt_hammerdetach, filt_hammerwrite };
3504 static struct filterops hammervnode_filtops =
3505         { FILTEROP_ISFD, NULL, filt_hammerdetach, filt_hammervnode };
3506
3507 static
3508 int
3509 hammer_vop_kqfilter(struct vop_kqfilter_args *ap)
3510 {
3511         struct vnode *vp = ap->a_vp;
3512         struct knote *kn = ap->a_kn;
3513
3514         switch (kn->kn_filter) {
3515         case EVFILT_READ:
3516                 kn->kn_fop = &hammerread_filtops;
3517                 break;
3518         case EVFILT_WRITE:
3519                 kn->kn_fop = &hammerwrite_filtops;
3520                 break;
3521         case EVFILT_VNODE:
3522                 kn->kn_fop = &hammervnode_filtops;
3523                 break;
3524         default:
3525                 return (EOPNOTSUPP);
3526         }
3527
3528         kn->kn_hook = (caddr_t)vp;
3529
3530         knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
3531
3532         return(0);
3533 }
3534
3535 static void
3536 filt_hammerdetach(struct knote *kn)
3537 {
3538         struct vnode *vp = (void *)kn->kn_hook;
3539
3540         knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
3541 }
3542
3543 static int
3544 filt_hammerread(struct knote *kn, long hint)
3545 {
3546         struct vnode *vp = (void *)kn->kn_hook;
3547         hammer_inode_t ip = VTOI(vp);
3548         hammer_mount_t hmp = ip->hmp;
3549         off_t off;
3550
3551         if (hint == NOTE_REVOKE) {
3552                 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
3553                 return(1);
3554         }
3555         lwkt_gettoken(&hmp->fs_token);  /* XXX use per-ip-token */
3556         off = ip->ino_data.size - kn->kn_fp->f_offset;
3557         kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
3558         lwkt_reltoken(&hmp->fs_token);
3559         if (kn->kn_sfflags & NOTE_OLDAPI)
3560                 return(1);
3561         return (kn->kn_data != 0);
3562 }
3563
3564 static int
3565 filt_hammerwrite(struct knote *kn, long hint)
3566 {
3567         if (hint == NOTE_REVOKE)
3568                 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
3569         kn->kn_data = 0;
3570         return (1);
3571 }
3572
3573 static int
3574 filt_hammervnode(struct knote *kn, long hint)
3575 {
3576         if (kn->kn_sfflags & hint)
3577                 kn->kn_fflags |= hint;
3578         if (hint == NOTE_REVOKE) {
3579                 kn->kn_flags |= EV_EOF;
3580                 return (1);
3581         }
3582         return (kn->kn_fflags != 0);
3583 }
3584