2 * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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.
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
35 #include <sys/mountctl.h>
36 #include <sys/namecache.h>
38 #include <vfs/fifofs/fifo.h>
45 static int hammer_vop_fsync(struct vop_fsync_args *);
46 static int hammer_vop_read(struct vop_read_args *);
47 static int hammer_vop_write(struct vop_write_args *);
48 static int hammer_vop_access(struct vop_access_args *);
49 static int hammer_vop_advlock(struct vop_advlock_args *);
50 static int hammer_vop_close(struct vop_close_args *);
51 static int hammer_vop_ncreate(struct vop_ncreate_args *);
52 static int hammer_vop_getattr(struct vop_getattr_args *);
53 static int hammer_vop_nresolve(struct vop_nresolve_args *);
54 static int hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *);
55 static int hammer_vop_nlink(struct vop_nlink_args *);
56 static int hammer_vop_nmkdir(struct vop_nmkdir_args *);
57 static int hammer_vop_nmknod(struct vop_nmknod_args *);
58 static int hammer_vop_open(struct vop_open_args *);
59 static int hammer_vop_print(struct vop_print_args *);
60 static int hammer_vop_readdir(struct vop_readdir_args *);
61 static int hammer_vop_readlink(struct vop_readlink_args *);
62 static int hammer_vop_nremove(struct vop_nremove_args *);
63 static int hammer_vop_nrename(struct vop_nrename_args *);
64 static int hammer_vop_nrmdir(struct vop_nrmdir_args *);
65 static int hammer_vop_markatime(struct vop_markatime_args *);
66 static int hammer_vop_setattr(struct vop_setattr_args *);
67 static int hammer_vop_strategy(struct vop_strategy_args *);
68 static int hammer_vop_bmap(struct vop_bmap_args *ap);
69 static int hammer_vop_nsymlink(struct vop_nsymlink_args *);
70 static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *);
71 static int hammer_vop_ioctl(struct vop_ioctl_args *);
72 static int hammer_vop_mountctl(struct vop_mountctl_args *);
73 static int hammer_vop_kqfilter (struct vop_kqfilter_args *);
75 static int hammer_vop_fifoclose (struct vop_close_args *);
76 static int hammer_vop_fiforead (struct vop_read_args *);
77 static int hammer_vop_fifowrite (struct vop_write_args *);
78 static int hammer_vop_fifokqfilter (struct vop_kqfilter_args *);
80 struct vop_ops hammer_vnode_vops = {
81 .vop_default = vop_defaultop,
82 .vop_fsync = hammer_vop_fsync,
83 .vop_getpages = vop_stdgetpages,
84 .vop_putpages = vop_stdputpages,
85 .vop_read = hammer_vop_read,
86 .vop_write = hammer_vop_write,
87 .vop_access = hammer_vop_access,
88 .vop_advlock = hammer_vop_advlock,
89 .vop_close = hammer_vop_close,
90 .vop_ncreate = hammer_vop_ncreate,
91 .vop_getattr = hammer_vop_getattr,
92 .vop_inactive = hammer_vop_inactive,
93 .vop_reclaim = hammer_vop_reclaim,
94 .vop_nresolve = hammer_vop_nresolve,
95 .vop_nlookupdotdot = hammer_vop_nlookupdotdot,
96 .vop_nlink = hammer_vop_nlink,
97 .vop_nmkdir = hammer_vop_nmkdir,
98 .vop_nmknod = hammer_vop_nmknod,
99 .vop_open = hammer_vop_open,
100 .vop_pathconf = vop_stdpathconf,
101 .vop_print = hammer_vop_print,
102 .vop_readdir = hammer_vop_readdir,
103 .vop_readlink = hammer_vop_readlink,
104 .vop_nremove = hammer_vop_nremove,
105 .vop_nrename = hammer_vop_nrename,
106 .vop_nrmdir = hammer_vop_nrmdir,
107 .vop_markatime = hammer_vop_markatime,
108 .vop_setattr = hammer_vop_setattr,
109 .vop_bmap = hammer_vop_bmap,
110 .vop_strategy = hammer_vop_strategy,
111 .vop_nsymlink = hammer_vop_nsymlink,
112 .vop_nwhiteout = hammer_vop_nwhiteout,
113 .vop_ioctl = hammer_vop_ioctl,
114 .vop_mountctl = hammer_vop_mountctl,
115 .vop_kqfilter = hammer_vop_kqfilter
118 struct vop_ops hammer_spec_vops = {
119 .vop_default = vop_defaultop,
120 .vop_fsync = hammer_vop_fsync,
121 .vop_read = vop_stdnoread,
122 .vop_write = vop_stdnowrite,
123 .vop_access = hammer_vop_access,
124 .vop_close = hammer_vop_close,
125 .vop_markatime = hammer_vop_markatime,
126 .vop_getattr = hammer_vop_getattr,
127 .vop_inactive = hammer_vop_inactive,
128 .vop_reclaim = hammer_vop_reclaim,
129 .vop_setattr = hammer_vop_setattr
132 struct vop_ops hammer_fifo_vops = {
133 .vop_default = fifo_vnoperate,
134 .vop_fsync = hammer_vop_fsync,
135 .vop_read = hammer_vop_fiforead,
136 .vop_write = hammer_vop_fifowrite,
137 .vop_access = hammer_vop_access,
138 .vop_close = hammer_vop_fifoclose,
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 .vop_kqfilter = hammer_vop_fifokqfilter
149 hammer_knote(struct vnode *vp, int flags)
152 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags);
155 static int hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
156 struct vnode *dvp, struct ucred *cred,
157 int flags, int isdir);
158 static int hammer_vop_strategy_read(struct vop_strategy_args *ap);
159 static int hammer_vop_strategy_write(struct vop_strategy_args *ap);
162 * hammer_vop_fsync { vp, waitfor }
164 * fsync() an inode to disk and wait for it to be completely committed
165 * such that the information would not be undone if a crash occured after
168 * NOTE: HAMMER's fsync()'s are going to remain expensive until we implement
169 * a REDO log. A sysctl is provided to relax HAMMER's fsync()
172 * Ultimately the combination of a REDO log and use of fast storage
173 * to front-end cluster caches will make fsync fast, but it aint
174 * here yet. And, in anycase, we need real transactional
175 * all-or-nothing features which are not restricted to a single file.
179 hammer_vop_fsync(struct vop_fsync_args *ap)
181 hammer_inode_t ip = VTOI(ap->a_vp);
182 hammer_mount_t hmp = ip->hmp;
183 int waitfor = ap->a_waitfor;
186 lwkt_gettoken(&hmp->fs_token);
189 * Fsync rule relaxation (default is either full synchronous flush
190 * or REDO semantics with synchronous flush).
192 if (ap->a_flags & VOP_FSYNC_SYSCALL) {
193 switch(hammer_fsync_mode) {
196 /* no REDO, full synchronous flush */
200 /* no REDO, full asynchronous flush */
201 if (waitfor == MNT_WAIT)
202 waitfor = MNT_NOWAIT;
205 /* REDO semantics, synchronous flush */
206 if (hmp->version < HAMMER_VOL_VERSION_FOUR)
208 mode = HAMMER_FLUSH_UNDOS_AUTO;
211 /* REDO semantics, relaxed asynchronous flush */
212 if (hmp->version < HAMMER_VOL_VERSION_FOUR)
214 mode = HAMMER_FLUSH_UNDOS_RELAXED;
215 if (waitfor == MNT_WAIT)
216 waitfor = MNT_NOWAIT;
219 /* ignore the fsync() system call */
220 lwkt_reltoken(&hmp->fs_token);
223 /* we have to do something */
224 mode = HAMMER_FLUSH_UNDOS_RELAXED;
225 if (waitfor == MNT_WAIT)
226 waitfor = MNT_NOWAIT;
231 * Fast fsync only needs to flush the UNDO/REDO fifo if
232 * HAMMER_INODE_REDO is non-zero and the only modifications
233 * made to the file are write or write-extends.
235 if ((ip->flags & HAMMER_INODE_REDO) &&
236 (ip->flags & HAMMER_INODE_MODMASK_NOREDO) == 0) {
237 ++hammer_count_fsyncs;
238 hammer_flusher_flush_undos(hmp, mode);
240 if (ip->vp && (ip->flags & HAMMER_INODE_MODMASK) == 0)
242 lwkt_reltoken(&hmp->fs_token);
247 * REDO is enabled by fsync(), the idea being we really only
248 * want to lay down REDO records when programs are using
249 * fsync() heavily. The first fsync() on the file starts
250 * the gravy train going and later fsync()s keep it hot by
251 * resetting the redo_count.
253 * We weren't running REDOs before now so we have to fall
254 * through and do a full fsync of what we have.
256 if (hmp->version >= HAMMER_VOL_VERSION_FOUR &&
257 (hmp->flags & HAMMER_MOUNT_REDO_RECOVERY_RUN) == 0) {
258 ip->flags |= HAMMER_INODE_REDO;
265 * Do a full flush sequence.
267 * Attempt to release the vnode while waiting for the inode to
268 * finish flushing. This can really mess up inactive->reclaim
269 * sequences so only do it if the vnode is active.
271 * WARNING! The VX lock functions must be used. vn_lock() will
272 * fail when this is part of a VOP_RECLAIM sequence.
274 ++hammer_count_fsyncs;
275 vfsync(ap->a_vp, waitfor, 1, NULL, NULL);
276 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
277 if (waitfor == MNT_WAIT) {
280 if ((ap->a_vp->v_flag & VRECLAIMED) == 0) {
286 hammer_wait_inode(ip);
290 if (ip->vp && (ip->flags & HAMMER_INODE_MODMASK) == 0)
292 lwkt_reltoken(&hmp->fs_token);
297 * hammer_vop_read { vp, uio, ioflag, cred }
299 * MPSAFE (for the cache safe does not require fs_token)
303 hammer_vop_read(struct vop_read_args *ap)
305 struct hammer_transaction trans;
320 if (ap->a_vp->v_type != VREG)
329 * Attempt to shortcut directly to the VM object using lwbufs.
330 * This is much faster than instantiating buffer cache buffers.
332 resid = uio->uio_resid;
333 error = vop_helper_read_shortcut(ap);
334 hammer_stats_file_read += resid - uio->uio_resid;
337 if (uio->uio_resid == 0)
341 * Allow the UIO's size to override the sequential heuristic.
343 blksize = hammer_blocksize(uio->uio_offset);
344 seqcount = (uio->uio_resid + (BKVASIZE - 1)) / BKVASIZE;
345 ioseqcount = (ap->a_ioflag >> 16);
346 if (seqcount < ioseqcount)
347 seqcount = ioseqcount;
350 * If reading or writing a huge amount of data we have to break
351 * atomicy and allow the operation to be interrupted by a signal
352 * or it can DOS the machine.
354 bigread = (uio->uio_resid > 100 * 1024 * 1024);
357 * Access the data typically in HAMMER_BUFSIZE blocks via the
358 * buffer cache, but HAMMER may use a variable block size based
361 * XXX Temporary hack, delay the start transaction while we remain
362 * MPSAFE. NOTE: ino_data.size cannot change while vnode is
365 while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) {
369 blksize = hammer_blocksize(uio->uio_offset);
370 offset = (int)uio->uio_offset & (blksize - 1);
371 base_offset = uio->uio_offset - offset;
373 if (bigread && (error = hammer_signal_check(ip->hmp)) != 0)
379 bp = getblk(ap->a_vp, base_offset, blksize, 0, 0);
380 if ((bp->b_flags & (B_INVAL | B_CACHE | B_RAM)) == B_CACHE) {
381 bp->b_flags &= ~B_AGE;
385 if (ap->a_ioflag & IO_NRDELAY) {
387 return (EWOULDBLOCK);
393 if (got_trans == 0) {
394 hammer_start_transaction(&trans, ip->hmp);
399 * NOTE: A valid bp has already been acquired, but was not
402 if (hammer_cluster_enable) {
404 * Use file_limit to prevent cluster_read() from
405 * creating buffers of the wrong block size past
408 file_limit = ip->ino_data.size;
409 if (base_offset < HAMMER_XDEMARC &&
410 file_limit > HAMMER_XDEMARC) {
411 file_limit = HAMMER_XDEMARC;
413 error = cluster_readx(ap->a_vp,
414 file_limit, base_offset,
415 blksize, uio->uio_resid,
416 seqcount * BKVASIZE, &bp);
418 error = breadnx(ap->a_vp, base_offset, blksize,
426 if ((hammer_debug_io & 0x0001) && (bp->b_flags & B_IODEBUG)) {
427 hdkprintf("doff %016jx read file %016jx@%016jx\n",
428 (intmax_t)bp->b_bio2.bio_offset,
429 (intmax_t)ip->obj_id,
430 (intmax_t)bp->b_loffset);
432 bp->b_flags &= ~B_IODEBUG;
433 if (blksize == HAMMER_XBUFSIZE)
434 bp->b_flags |= B_CLUSTEROK;
436 n = blksize - offset;
437 if (n > uio->uio_resid)
439 if (n > ip->ino_data.size - uio->uio_offset)
440 n = (int)(ip->ino_data.size - uio->uio_offset);
443 * Set B_AGE, data has a lower priority than meta-data.
445 * Use a hold/unlock/drop sequence to run the uiomove
446 * with the buffer unlocked, avoiding deadlocks against
447 * read()s on mmap()'d spaces.
449 bp->b_flags |= B_AGE;
450 error = uiomovebp(bp, (char *)bp->b_data + offset, n, uio);
455 hammer_stats_file_read += n;
461 * Try to update the atime with just the inode lock for maximum
462 * concurrency. If we can't shortcut it we have to get the full
465 if (got_trans == 0 && hammer_update_atime_quick(ip) < 0) {
466 hammer_start_transaction(&trans, ip->hmp);
471 if ((ip->flags & HAMMER_INODE_RO) == 0 &&
472 (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) {
473 lwkt_gettoken(&hmp->fs_token);
474 ip->ino_data.atime = trans.time;
475 hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME);
476 hammer_done_transaction(&trans);
477 lwkt_reltoken(&hmp->fs_token);
479 hammer_done_transaction(&trans);
486 * hammer_vop_write { vp, uio, ioflag, cred }
490 hammer_vop_write(struct vop_write_args *ap)
492 struct hammer_transaction trans;
493 struct hammer_inode *ip;
508 if (ap->a_vp->v_type != VREG)
514 seqcount = ap->a_ioflag >> 16;
516 if (ip->flags & HAMMER_INODE_RO)
520 * Create a transaction to cover the operations we perform.
522 hammer_start_transaction(&trans, hmp);
528 if (ap->a_ioflag & IO_APPEND)
529 uio->uio_offset = ip->ino_data.size;
532 * Check for illegal write offsets. Valid range is 0...2^63-1.
534 * NOTE: the base_off assignment is required to work around what
535 * I consider to be a GCC-4 optimization bug.
537 if (uio->uio_offset < 0) {
538 hammer_done_transaction(&trans);
541 base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */
542 if (uio->uio_resid > 0 && base_offset <= uio->uio_offset) {
543 hammer_done_transaction(&trans);
547 if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc &&
548 base_offset > td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
549 hammer_done_transaction(&trans);
550 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
555 * If reading or writing a huge amount of data we have to break
556 * atomicy and allow the operation to be interrupted by a signal
557 * or it can DOS the machine.
559 * Preset redo_count so we stop generating REDOs earlier if the
562 * redo_count is heuristical, SMP races are ok
564 bigwrite = (uio->uio_resid > 100 * 1024 * 1024);
565 if ((ip->flags & HAMMER_INODE_REDO) &&
566 ip->redo_count < hammer_limit_redo) {
567 ip->redo_count += uio->uio_resid;
571 * Access the data typically in HAMMER_BUFSIZE blocks via the
572 * buffer cache, but HAMMER may use a variable block size based
575 while (uio->uio_resid > 0) {
583 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0)
585 if (bigwrite && (error = hammer_signal_check(hmp)) != 0)
588 blksize = hammer_blocksize(uio->uio_offset);
591 * Control the number of pending records associated with
592 * this inode. If too many have accumulated start a
593 * flush. Try to maintain a pipeline with the flusher.
595 * NOTE: It is possible for other sources to grow the
596 * records but not necessarily issue another flush,
597 * so use a timeout and ensure that a re-flush occurs.
599 if (ip->rsv_recs >= hammer_limit_inode_recs) {
600 lwkt_gettoken(&hmp->fs_token);
601 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
602 while (ip->rsv_recs >= hammer_limit_inode_recs * 2) {
603 ip->flags |= HAMMER_INODE_RECSW;
604 tsleep(&ip->rsv_recs, 0, "hmrwww", hz);
605 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL);
607 lwkt_reltoken(&hmp->fs_token);
611 * Do not allow HAMMER to blow out the buffer cache. Very
612 * large UIOs can lockout other processes due to bwillwrite()
615 * The hammer inode is not locked during these operations.
616 * The vnode is locked which can interfere with the pageout
617 * daemon for non-UIO_NOCOPY writes but should not interfere
618 * with the buffer cache. Even so, we cannot afford to
619 * allow the pageout daemon to build up too many dirty buffer
622 * Only call this if we aren't being recursively called from
623 * a virtual disk device (vn), else we may deadlock.
625 if ((ap->a_ioflag & IO_RECURSE) == 0)
629 * Calculate the blocksize at the current offset and figure
630 * out how much we can actually write.
632 blkmask = blksize - 1;
633 offset = (int)uio->uio_offset & blkmask;
634 base_offset = uio->uio_offset & ~(int64_t)blkmask;
635 n = blksize - offset;
636 if (n > uio->uio_resid) {
642 nsize = uio->uio_offset + n;
643 if (nsize > ip->ino_data.size) {
644 if (uio->uio_offset > ip->ino_data.size)
648 nvextendbuf(ap->a_vp,
651 hammer_blocksize(ip->ino_data.size),
652 hammer_blocksize(nsize),
653 hammer_blockoff(ip->ino_data.size),
654 hammer_blockoff(nsize),
657 kflags |= NOTE_EXTEND;
660 if (uio->uio_segflg == UIO_NOCOPY) {
662 * Issuing a write with the same data backing the
663 * buffer. Instantiate the buffer to collect the
664 * backing vm pages, then read-in any missing bits.
666 * This case is used by vop_stdputpages().
668 bp = getblk(ap->a_vp, base_offset,
669 blksize, GETBLK_BHEAVY, 0);
670 if ((bp->b_flags & B_CACHE) == 0) {
672 error = bread(ap->a_vp, base_offset,
675 } else if (offset == 0 && uio->uio_resid >= blksize) {
677 * Even though we are entirely overwriting the buffer
678 * we may still have to zero it out to avoid a
679 * mmap/write visibility issue.
681 bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0);
682 if ((bp->b_flags & B_CACHE) == 0)
684 } else if (base_offset >= ip->ino_data.size) {
686 * If the base offset of the buffer is beyond the
687 * file EOF, we don't have to issue a read.
689 bp = getblk(ap->a_vp, base_offset,
690 blksize, GETBLK_BHEAVY, 0);
694 * Partial overwrite, read in any missing bits then
695 * replace the portion being written.
697 error = bread(ap->a_vp, base_offset, blksize, &bp);
702 error = uiomovebp(bp, bp->b_data + offset, n, uio);
704 lwkt_gettoken(&hmp->fs_token);
707 * Generate REDO records if enabled and redo_count will not
708 * exceeded the limit.
710 * If redo_count exceeds the limit we stop generating records
711 * and clear HAMMER_INODE_REDO. This will cause the next
712 * fsync() to do a full meta-data sync instead of just an
713 * UNDO/REDO fifo update.
715 * When clearing HAMMER_INODE_REDO any pre-existing REDOs
716 * will still be tracked. The tracks will be terminated
717 * when the related meta-data (including possible data
718 * modifications which are not tracked via REDO) is
721 if ((ip->flags & HAMMER_INODE_REDO) && error == 0) {
722 if (ip->redo_count < hammer_limit_redo) {
723 bp->b_flags |= B_VFSFLAG1;
724 error = hammer_generate_redo(&trans, ip,
725 base_offset + offset,
730 ip->flags &= ~HAMMER_INODE_REDO;
735 * If we screwed up we have to undo any VM size changes we
741 nvtruncbuf(ap->a_vp, ip->ino_data.size,
742 hammer_blocksize(ip->ino_data.size),
743 hammer_blockoff(ip->ino_data.size),
746 lwkt_reltoken(&hmp->fs_token);
749 kflags |= NOTE_WRITE;
750 hammer_stats_file_write += n;
751 if (blksize == HAMMER_XBUFSIZE)
752 bp->b_flags |= B_CLUSTEROK;
753 if (ip->ino_data.size < uio->uio_offset) {
754 ip->ino_data.size = uio->uio_offset;
755 flags = HAMMER_INODE_SDIRTY;
759 ip->ino_data.mtime = trans.time;
760 flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS;
761 hammer_modify_inode(&trans, ip, flags);
764 * Once we dirty the buffer any cached zone-X offset
765 * becomes invalid. HAMMER NOTE: no-history mode cannot
766 * allow overwriting over the same data sector unless
767 * we provide UNDOs for the old data, which we don't.
769 bp->b_bio2.bio_offset = NOOFFSET;
771 lwkt_reltoken(&hmp->fs_token);
774 * Final buffer disposition.
776 * Because meta-data updates are deferred, HAMMER is
777 * especially sensitive to excessive bdwrite()s because
778 * the I/O stream is not broken up by disk reads. So the
779 * buffer cache simply cannot keep up.
781 * WARNING! blksize is variable. cluster_write() is
782 * expected to not blow up if it encounters
783 * buffers that do not match the passed blksize.
785 * NOTE! Hammer shouldn't need to bawrite()/cluster_write().
786 * The ip->rsv_recs check should burst-flush the data.
787 * If we queue it immediately the buf could be left
788 * locked on the device queue for a very long time.
790 * However, failing to flush a dirty buffer out when
791 * issued from the pageout daemon can result in a low
792 * memory deadlock against bio_page_alloc(), so we
793 * have to bawrite() on IO_ASYNC as well.
795 * NOTE! To avoid degenerate stalls due to mismatched block
796 * sizes we only honor IO_DIRECT on the write which
797 * abuts the end of the buffer. However, we must
798 * honor IO_SYNC in case someone is silly enough to
799 * configure a HAMMER file as swap, or when HAMMER
800 * is serving NFS (for commits). Ick ick.
802 bp->b_flags |= B_AGE;
803 if (blksize == HAMMER_XBUFSIZE)
804 bp->b_flags |= B_CLUSTEROK;
806 if (ap->a_ioflag & IO_SYNC) {
808 } else if ((ap->a_ioflag & IO_DIRECT) && endofblk) {
810 } else if (ap->a_ioflag & IO_ASYNC) {
812 } else if (hammer_cluster_enable &&
813 !(ap->a_vp->v_mount->mnt_flag & MNT_NOCLUSTERW)) {
814 if (base_offset < HAMMER_XDEMARC)
815 cluster_eof = hammer_blockdemarc(base_offset,
818 cluster_eof = ip->ino_data.size;
819 cluster_write(bp, cluster_eof, blksize, seqcount);
824 hammer_done_transaction(&trans);
825 hammer_knote(ap->a_vp, kflags);
831 * hammer_vop_access { vp, mode, cred }
833 * MPSAFE - does not require fs_token
837 hammer_vop_access(struct vop_access_args *ap)
839 struct hammer_inode *ip = VTOI(ap->a_vp);
844 ++hammer_stats_file_iopsr;
845 uid = hammer_to_unix_xid(&ip->ino_data.uid);
846 gid = hammer_to_unix_xid(&ip->ino_data.gid);
848 error = vop_helper_access(ap, uid, gid, ip->ino_data.mode,
849 ip->ino_data.uflags);
854 * hammer_vop_advlock { vp, id, op, fl, flags }
856 * MPSAFE - does not require fs_token
860 hammer_vop_advlock(struct vop_advlock_args *ap)
862 hammer_inode_t ip = VTOI(ap->a_vp);
864 return (lf_advlock(ap, &ip->advlock, ip->ino_data.size));
868 * hammer_vop_close { vp, fflag }
870 * We can only sync-on-close for normal closes. XXX disabled for now.
874 hammer_vop_close(struct vop_close_args *ap)
877 struct vnode *vp = ap->a_vp;
878 hammer_inode_t ip = VTOI(vp);
880 if (ip->flags & (HAMMER_INODE_CLOSESYNC|HAMMER_INODE_CLOSEASYNC)) {
881 if (vn_islocked(vp) == LK_EXCLUSIVE &&
882 (vp->v_flag & (VINACTIVE|VRECLAIMED)) == 0) {
883 if (ip->flags & HAMMER_INODE_CLOSESYNC)
886 waitfor = MNT_NOWAIT;
887 ip->flags &= ~(HAMMER_INODE_CLOSESYNC |
888 HAMMER_INODE_CLOSEASYNC);
889 VOP_FSYNC(vp, MNT_NOWAIT, waitfor);
893 return (vop_stdclose(ap));
897 * hammer_vop_ncreate { nch, dvp, vpp, cred, vap }
899 * The operating system has already ensured that the directory entry
900 * does not exist and done all appropriate namespace locking.
904 hammer_vop_ncreate(struct vop_ncreate_args *ap)
906 struct hammer_transaction trans;
907 struct hammer_inode *dip;
908 struct hammer_inode *nip;
909 struct nchandle *nch;
914 dip = VTOI(ap->a_dvp);
917 if (dip->flags & HAMMER_INODE_RO)
919 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
923 * Create a transaction to cover the operations we perform.
925 lwkt_gettoken(&hmp->fs_token);
926 hammer_start_transaction(&trans, hmp);
927 ++hammer_stats_file_iopsw;
930 * Create a new filesystem object of the requested type. The
931 * returned inode will be referenced and shared-locked to prevent
932 * it from being moved to the flusher.
934 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
935 dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
938 hkprintf("hammer_create_inode error %d\n", error);
939 hammer_done_transaction(&trans);
941 lwkt_reltoken(&hmp->fs_token);
946 * Add the new filesystem object to the directory. This will also
947 * bump the inode's link count.
949 error = hammer_ip_add_directory(&trans, dip,
950 nch->ncp->nc_name, nch->ncp->nc_nlen,
953 hkprintf("hammer_ip_add_directory error %d\n", error);
959 hammer_rel_inode(nip, 0);
960 hammer_done_transaction(&trans);
963 error = hammer_get_vnode(nip, ap->a_vpp);
964 hammer_done_transaction(&trans);
965 hammer_rel_inode(nip, 0);
967 cache_setunresolved(ap->a_nch);
968 cache_setvp(ap->a_nch, *ap->a_vpp);
970 hammer_knote(ap->a_dvp, NOTE_WRITE);
972 lwkt_reltoken(&hmp->fs_token);
977 * hammer_vop_getattr { vp, vap }
979 * Retrieve an inode's attribute information. When accessing inodes
980 * historically we fake the atime field to ensure consistent results.
981 * The atime field is stored in the B-Tree element and allowed to be
982 * updated without cycling the element.
984 * MPSAFE - does not require fs_token
988 hammer_vop_getattr(struct vop_getattr_args *ap)
990 struct hammer_inode *ip = VTOI(ap->a_vp);
991 struct vattr *vap = ap->a_vap;
994 * We want the fsid to be different when accessing a filesystem
995 * with different as-of's so programs like diff don't think
996 * the files are the same.
998 * We also want the fsid to be the same when comparing snapshots,
999 * or when comparing mirrors (which might be backed by different
1000 * physical devices). HAMMER fsids are based on the PFS's
1001 * shared_uuid field.
1003 * XXX there is a chance of collision here. The va_fsid reported
1004 * by stat is different from the more involved fsid used in the
1007 ++hammer_stats_file_iopsr;
1008 hammer_lock_sh(&ip->lock);
1009 vap->va_fsid = ip->pfsm->fsid_udev ^ (uint32_t)ip->obj_asof ^
1010 (uint32_t)(ip->obj_asof >> 32);
1012 vap->va_fileid = ip->ino_leaf.base.obj_id;
1013 vap->va_mode = ip->ino_data.mode;
1014 vap->va_nlink = ip->ino_data.nlinks;
1015 vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid);
1016 vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid);
1019 vap->va_size = ip->ino_data.size;
1022 * Special case for @@PFS softlinks. The actual size of the
1023 * expanded softlink is "@@0x%016llx:%05d" == 26 bytes.
1024 * or for MAX_TID is "@@-1:%05d" == 10 bytes.
1026 * Note that userspace hammer command does not allow users to
1027 * create a @@PFS softlink under an existing other PFS (id!=0)
1028 * so the ip localization here for @@PFS softlink is always 0.
1030 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK &&
1031 ip->ino_data.size == 10 &&
1032 ip->obj_asof == HAMMER_MAX_TID &&
1033 ip->obj_localization == 0 &&
1034 strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) {
1035 if (ip->pfsm->pfsd.mirror_flags & HAMMER_PFSD_SLAVE)
1042 * We must provide a consistent atime and mtime for snapshots
1043 * so people can do a 'tar cf - ... | md5' on them and get
1044 * consistent results.
1046 if (ip->flags & HAMMER_INODE_RO) {
1047 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime);
1048 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime);
1050 hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime);
1051 hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime);
1053 hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime);
1054 vap->va_flags = ip->ino_data.uflags;
1055 vap->va_gen = 1; /* hammer inums are unique for all time */
1056 vap->va_blocksize = HAMMER_BUFSIZE;
1057 if (ip->ino_data.size >= HAMMER_XDEMARC) {
1058 vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) &
1060 } else if (ip->ino_data.size > HAMMER_HBUFSIZE) {
1061 vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) &
1064 vap->va_bytes = (ip->ino_data.size + 15) & ~15;
1067 vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type);
1068 vap->va_filerev = 0; /* XXX */
1069 vap->va_uid_uuid = ip->ino_data.uid;
1070 vap->va_gid_uuid = ip->ino_data.gid;
1071 vap->va_fsid_uuid = ip->hmp->fsid;
1072 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
1075 switch (ip->ino_data.obj_type) {
1076 case HAMMER_OBJTYPE_CDEV:
1077 case HAMMER_OBJTYPE_BDEV:
1078 vap->va_rmajor = ip->ino_data.rmajor;
1079 vap->va_rminor = ip->ino_data.rminor;
1084 hammer_unlock(&ip->lock);
1089 * hammer_vop_nresolve { nch, dvp, cred }
1091 * Locate the requested directory entry.
1095 hammer_vop_nresolve(struct vop_nresolve_args *ap)
1097 struct hammer_transaction trans;
1098 struct namecache *ncp;
1103 struct hammer_cursor cursor;
1112 uint32_t localization;
1113 uint32_t max_iterations;
1116 * Misc initialization, plus handle as-of name extensions. Look for
1117 * the '@@' extension. Note that as-of files and directories cannot
1120 dip = VTOI(ap->a_dvp);
1121 ncp = ap->a_nch->ncp;
1122 asof = dip->obj_asof;
1123 localization = dip->obj_localization; /* for code consistency */
1124 nlen = ncp->nc_nlen;
1125 flags = dip->flags & HAMMER_INODE_RO;
1129 lwkt_gettoken(&hmp->fs_token);
1130 hammer_simple_transaction(&trans, hmp);
1131 ++hammer_stats_file_iopsr;
1133 for (i = 0; i < nlen; ++i) {
1134 if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') {
1135 error = hammer_str_to_tid(ncp->nc_name + i + 2,
1136 &ispfs, &asof, &localization);
1141 if (asof != HAMMER_MAX_TID)
1142 flags |= HAMMER_INODE_RO;
1149 * If this is a PFS softlink we dive into the PFS
1151 if (ispfs && nlen == 0) {
1152 ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT,
1156 error = hammer_get_vnode(ip, &vp);
1157 hammer_rel_inode(ip, 0);
1163 cache_setvp(ap->a_nch, vp);
1170 * If there is no path component the time extension is relative to dip.
1171 * e.g. "fubar/@@<snapshot>"
1173 * "." is handled by the kernel, but ".@@<snapshot>" is not.
1174 * e.g. "fubar/.@@<snapshot>"
1176 * ".." is handled by the kernel. We do not currently handle
1179 if (nlen == 0 || (nlen == 1 && ncp->nc_name[0] == '.')) {
1180 ip = hammer_get_inode(&trans, dip, dip->obj_id,
1181 asof, dip->obj_localization,
1184 error = hammer_get_vnode(ip, &vp);
1185 hammer_rel_inode(ip, 0);
1191 cache_setvp(ap->a_nch, vp);
1198 * Calculate the namekey and setup the key range for the scan. This
1199 * works kinda like a chained hash table where the lower 32 bits
1200 * of the namekey synthesize the chain.
1202 * The key range is inclusive of both key_beg and key_end.
1204 namekey = hammer_directory_namekey(dip, ncp->nc_name, nlen,
1207 error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip);
1208 cursor.key_beg.localization = dip->obj_localization +
1209 hammer_dir_localization(dip);
1210 cursor.key_beg.obj_id = dip->obj_id;
1211 cursor.key_beg.key = namekey;
1212 cursor.key_beg.create_tid = 0;
1213 cursor.key_beg.delete_tid = 0;
1214 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1215 cursor.key_beg.obj_type = 0;
1217 cursor.key_end = cursor.key_beg;
1218 cursor.key_end.key += max_iterations;
1220 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1223 * Scan all matching records (the chain), locate the one matching
1224 * the requested path component.
1226 * The hammer_ip_*() functions merge in-memory records with on-disk
1227 * records for the purposes of the search.
1230 localization = HAMMER_DEF_LOCALIZATION;
1233 error = hammer_ip_first(&cursor);
1234 while (error == 0) {
1235 error = hammer_ip_resolve_data(&cursor);
1238 if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF &&
1239 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
1240 obj_id = cursor.data->entry.obj_id;
1241 localization = cursor.data->entry.localization;
1244 error = hammer_ip_next(&cursor);
1247 hammer_done_cursor(&cursor);
1250 * Lookup the obj_id. This should always succeed. If it does not
1251 * the filesystem may be damaged and we return a dummy inode.
1254 ip = hammer_get_inode(&trans, dip, obj_id,
1257 if (error == ENOENT) {
1258 hkprintf("WARNING: Missing inode for dirent \"%s\"\n"
1259 "\tobj_id = %016llx, asof=%016llx, lo=%08x\n",
1261 (long long)obj_id, (long long)asof,
1264 ip = hammer_get_dummy_inode(&trans, dip, obj_id,
1269 error = hammer_get_vnode(ip, &vp);
1270 hammer_rel_inode(ip, 0);
1276 cache_setvp(ap->a_nch, vp);
1279 } else if (error == ENOENT) {
1280 cache_setvp(ap->a_nch, NULL);
1283 hammer_done_transaction(&trans);
1284 lwkt_reltoken(&hmp->fs_token);
1289 * hammer_vop_nlookupdotdot { dvp, vpp, cred }
1291 * Locate the parent directory of a directory vnode.
1293 * dvp is referenced but not locked. *vpp must be returned referenced and
1294 * locked. A parent_obj_id of 0 does not necessarily indicate that we are
1295 * at the root, instead it could indicate that the directory we were in was
1298 * NOTE: as-of sequences are not linked into the directory structure. If
1299 * we are at the root with a different asof then the mount point, reload
1300 * the same directory with the mount point's asof. I'm not sure what this
1301 * will do to NFS. We encode ASOF stamps in NFS file handles so it might not
1302 * get confused, but it hasn't been tested.
1306 hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
1308 struct hammer_transaction trans;
1309 struct hammer_inode *dip;
1310 struct hammer_inode *ip;
1312 int64_t parent_obj_id;
1313 uint32_t parent_obj_localization;
1317 dip = VTOI(ap->a_dvp);
1318 asof = dip->obj_asof;
1322 * Whos are parent? This could be the root of a pseudo-filesystem
1323 * whos parent is in another localization domain.
1325 lwkt_gettoken(&hmp->fs_token);
1326 parent_obj_id = dip->ino_data.parent_obj_id;
1327 if (dip->obj_id == HAMMER_OBJID_ROOT)
1328 parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization;
1330 parent_obj_localization = dip->obj_localization;
1333 * It's probably a PFS root when dip->ino_data.parent_obj_id is 0.
1335 if (parent_obj_id == 0) {
1336 if (dip->obj_id == HAMMER_OBJID_ROOT &&
1337 asof != hmp->asof) {
1338 parent_obj_id = dip->obj_id;
1340 *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK);
1341 ksnprintf(*ap->a_fakename, 19, "0x%016llx",
1342 (long long)dip->obj_asof);
1345 lwkt_reltoken(&hmp->fs_token);
1350 hammer_simple_transaction(&trans, hmp);
1351 ++hammer_stats_file_iopsr;
1353 ip = hammer_get_inode(&trans, dip, parent_obj_id,
1354 asof, parent_obj_localization,
1355 dip->flags, &error);
1357 error = hammer_get_vnode(ip, ap->a_vpp);
1358 hammer_rel_inode(ip, 0);
1362 hammer_done_transaction(&trans);
1363 lwkt_reltoken(&hmp->fs_token);
1368 * hammer_vop_nlink { nch, dvp, vp, cred }
1372 hammer_vop_nlink(struct vop_nlink_args *ap)
1374 struct hammer_transaction trans;
1375 struct hammer_inode *dip;
1376 struct hammer_inode *ip;
1377 struct nchandle *nch;
1381 if (ap->a_dvp->v_mount != ap->a_vp->v_mount)
1385 dip = VTOI(ap->a_dvp);
1386 ip = VTOI(ap->a_vp);
1389 if (dip->obj_localization != ip->obj_localization)
1392 if (dip->flags & HAMMER_INODE_RO)
1394 if (ip->flags & HAMMER_INODE_RO)
1396 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1400 * Create a transaction to cover the operations we perform.
1402 lwkt_gettoken(&hmp->fs_token);
1403 hammer_start_transaction(&trans, hmp);
1404 ++hammer_stats_file_iopsw;
1407 * Add the filesystem object to the directory. Note that neither
1408 * dip nor ip are referenced or locked, but their vnodes are
1409 * referenced. This function will bump the inode's link count.
1411 error = hammer_ip_add_directory(&trans, dip,
1412 nch->ncp->nc_name, nch->ncp->nc_nlen,
1419 cache_setunresolved(nch);
1420 cache_setvp(nch, ap->a_vp);
1422 hammer_done_transaction(&trans);
1423 hammer_knote(ap->a_vp, NOTE_LINK);
1424 hammer_knote(ap->a_dvp, NOTE_WRITE);
1425 lwkt_reltoken(&hmp->fs_token);
1430 * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap }
1432 * The operating system has already ensured that the directory entry
1433 * does not exist and done all appropriate namespace locking.
1437 hammer_vop_nmkdir(struct vop_nmkdir_args *ap)
1439 struct hammer_transaction trans;
1440 struct hammer_inode *dip;
1441 struct hammer_inode *nip;
1442 struct nchandle *nch;
1447 dip = VTOI(ap->a_dvp);
1450 if (dip->flags & HAMMER_INODE_RO)
1452 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1456 * Create a transaction to cover the operations we perform.
1458 lwkt_gettoken(&hmp->fs_token);
1459 hammer_start_transaction(&trans, hmp);
1460 ++hammer_stats_file_iopsw;
1463 * Create a new filesystem object of the requested type. The
1464 * returned inode will be referenced but not locked.
1466 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1467 dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
1470 hkprintf("hammer_mkdir error %d\n", error);
1471 hammer_done_transaction(&trans);
1473 lwkt_reltoken(&hmp->fs_token);
1477 * Add the new filesystem object to the directory. This will also
1478 * bump the inode's link count.
1480 error = hammer_ip_add_directory(&trans, dip,
1481 nch->ncp->nc_name, nch->ncp->nc_nlen,
1484 hkprintf("hammer_mkdir (add) error %d\n", error);
1490 hammer_rel_inode(nip, 0);
1493 error = hammer_get_vnode(nip, ap->a_vpp);
1494 hammer_rel_inode(nip, 0);
1496 cache_setunresolved(ap->a_nch);
1497 cache_setvp(ap->a_nch, *ap->a_vpp);
1500 hammer_done_transaction(&trans);
1502 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1503 lwkt_reltoken(&hmp->fs_token);
1508 * hammer_vop_nmknod { nch, dvp, vpp, cred, vap }
1510 * The operating system has already ensured that the directory entry
1511 * does not exist and done all appropriate namespace locking.
1515 hammer_vop_nmknod(struct vop_nmknod_args *ap)
1517 struct hammer_transaction trans;
1518 struct hammer_inode *dip;
1519 struct hammer_inode *nip;
1520 struct nchandle *nch;
1525 dip = VTOI(ap->a_dvp);
1528 if (dip->flags & HAMMER_INODE_RO)
1530 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1534 * Create a transaction to cover the operations we perform.
1536 lwkt_gettoken(&hmp->fs_token);
1537 hammer_start_transaction(&trans, hmp);
1538 ++hammer_stats_file_iopsw;
1541 * Create a new filesystem object of the requested type. The
1542 * returned inode will be referenced but not locked.
1544 * If mknod specifies a directory a pseudo-fs is created.
1546 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
1547 dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
1550 hammer_done_transaction(&trans);
1552 lwkt_reltoken(&hmp->fs_token);
1557 * Add the new filesystem object to the directory. This will also
1558 * bump the inode's link count.
1560 error = hammer_ip_add_directory(&trans, dip,
1561 nch->ncp->nc_name, nch->ncp->nc_nlen,
1568 hammer_rel_inode(nip, 0);
1571 error = hammer_get_vnode(nip, ap->a_vpp);
1572 hammer_rel_inode(nip, 0);
1574 cache_setunresolved(ap->a_nch);
1575 cache_setvp(ap->a_nch, *ap->a_vpp);
1578 hammer_done_transaction(&trans);
1580 hammer_knote(ap->a_dvp, NOTE_WRITE);
1581 lwkt_reltoken(&hmp->fs_token);
1586 * hammer_vop_open { vp, mode, cred, fp }
1588 * MPSAFE (does not require fs_token)
1592 hammer_vop_open(struct vop_open_args *ap)
1596 ++hammer_stats_file_iopsr;
1597 ip = VTOI(ap->a_vp);
1599 if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO))
1601 return(vop_stdopen(ap));
1605 * hammer_vop_print { vp }
1609 hammer_vop_print(struct vop_print_args *ap)
1615 * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies }
1619 hammer_vop_readdir(struct vop_readdir_args *ap)
1621 struct hammer_transaction trans;
1622 struct hammer_cursor cursor;
1623 struct hammer_inode *ip;
1626 hammer_base_elm_t base;
1635 ++hammer_stats_file_iopsr;
1636 ip = VTOI(ap->a_vp);
1638 saveoff = uio->uio_offset;
1641 if (ap->a_ncookies) {
1642 ncookies = uio->uio_resid / 16 + 1;
1643 if (ncookies > 1024)
1645 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
1653 lwkt_gettoken(&hmp->fs_token);
1654 hammer_simple_transaction(&trans, hmp);
1657 * Handle artificial entries
1659 * It should be noted that the minimum value for a directory
1660 * hash key on-media is 0x0000000100000000, so we can use anything
1661 * less then that to represent our 'special' key space.
1665 r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, ".");
1669 cookies[cookie_index] = saveoff;
1672 if (cookie_index == ncookies)
1676 if (ip->ino_data.parent_obj_id) {
1677 r = vop_write_dirent(&error, uio,
1678 ip->ino_data.parent_obj_id,
1681 r = vop_write_dirent(&error, uio,
1682 ip->obj_id, DT_DIR, 2, "..");
1687 cookies[cookie_index] = saveoff;
1690 if (cookie_index == ncookies)
1695 * Key range (begin and end inclusive) to scan. Directory keys
1696 * directly translate to a 64 bit 'seek' position.
1698 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1699 cursor.key_beg.localization = ip->obj_localization +
1700 hammer_dir_localization(ip);
1701 cursor.key_beg.obj_id = ip->obj_id;
1702 cursor.key_beg.create_tid = 0;
1703 cursor.key_beg.delete_tid = 0;
1704 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
1705 cursor.key_beg.obj_type = 0;
1706 cursor.key_beg.key = saveoff;
1708 cursor.key_end = cursor.key_beg;
1709 cursor.key_end.key = HAMMER_MAX_KEY;
1710 cursor.asof = ip->obj_asof;
1711 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
1713 error = hammer_ip_first(&cursor);
1715 while (error == 0) {
1716 error = hammer_ip_resolve_data(&cursor);
1719 base = &cursor.leaf->base;
1720 saveoff = base->key;
1721 KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF);
1723 if (base->obj_id != ip->obj_id)
1724 hpanic("bad record at %p", cursor.node);
1727 * Convert pseudo-filesystems into softlinks
1729 dtype = hammer_get_dtype(cursor.leaf->base.obj_type);
1730 r = vop_write_dirent(
1731 &error, uio, cursor.data->entry.obj_id,
1733 cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF ,
1734 (void *)cursor.data->entry.name);
1739 cookies[cookie_index] = base->key;
1741 if (cookie_index == ncookies)
1743 error = hammer_ip_next(&cursor);
1745 hammer_done_cursor(&cursor);
1748 hammer_done_transaction(&trans);
1751 *ap->a_eofflag = (error == ENOENT);
1752 uio->uio_offset = saveoff;
1753 if (error && cookie_index == 0) {
1754 if (error == ENOENT)
1757 kfree(cookies, M_TEMP);
1758 *ap->a_ncookies = 0;
1759 *ap->a_cookies = NULL;
1762 if (error == ENOENT)
1765 *ap->a_ncookies = cookie_index;
1766 *ap->a_cookies = cookies;
1769 lwkt_reltoken(&hmp->fs_token);
1774 * hammer_vop_readlink { vp, uio, cred }
1778 hammer_vop_readlink(struct vop_readlink_args *ap)
1780 struct hammer_transaction trans;
1781 struct hammer_cursor cursor;
1782 struct hammer_inode *ip;
1785 uint32_t localization;
1786 hammer_pseudofs_inmem_t pfsm;
1789 ip = VTOI(ap->a_vp);
1792 lwkt_gettoken(&hmp->fs_token);
1795 * Shortcut if the symlink data was stuffed into ino_data.
1797 * Also expand special "@@PFS%05d" softlinks (expansion only
1798 * occurs for non-historical (current) accesses made from the
1799 * primary filesystem).
1801 * Note that userspace hammer command does not allow users to
1802 * create a @@PFS softlink under an existing other PFS (id!=0)
1803 * so the ip localization here for @@PFS softlink is always 0.
1805 if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) {
1809 ptr = ip->ino_data.ext.symlink;
1810 bytes = (int)ip->ino_data.size;
1812 ip->obj_asof == HAMMER_MAX_TID &&
1813 ip->obj_localization == 0 &&
1814 strncmp(ptr, "@@PFS", 5) == 0) {
1815 hammer_simple_transaction(&trans, hmp);
1816 bcopy(ptr + 5, buf, 5);
1818 localization = strtoul(buf, NULL, 10) << 16;
1819 pfsm = hammer_load_pseudofs(&trans, localization,
1822 if (pfsm->pfsd.mirror_flags &
1823 HAMMER_PFSD_SLAVE) {
1824 /* vap->va_size == 26 */
1825 ksnprintf(buf, sizeof(buf),
1827 (long long)pfsm->pfsd.sync_end_tid,
1828 localization >> 16);
1830 /* vap->va_size == 10 */
1831 ksnprintf(buf, sizeof(buf),
1833 localization >> 16);
1835 ksnprintf(buf, sizeof(buf),
1837 (long long)HAMMER_MAX_TID,
1838 localization >> 16);
1842 bytes = strlen(buf);
1845 hammer_rel_pseudofs(hmp, pfsm);
1846 hammer_done_transaction(&trans);
1848 error = uiomove(ptr, bytes, ap->a_uio);
1849 lwkt_reltoken(&hmp->fs_token);
1856 hammer_simple_transaction(&trans, hmp);
1857 ++hammer_stats_file_iopsr;
1858 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
1861 * Key range (begin and end inclusive) to scan. Directory keys
1862 * directly translate to a 64 bit 'seek' position.
1864 cursor.key_beg.localization = ip->obj_localization +
1865 HAMMER_LOCALIZE_MISC;
1866 cursor.key_beg.obj_id = ip->obj_id;
1867 cursor.key_beg.create_tid = 0;
1868 cursor.key_beg.delete_tid = 0;
1869 cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX;
1870 cursor.key_beg.obj_type = 0;
1871 cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK;
1872 cursor.asof = ip->obj_asof;
1873 cursor.flags |= HAMMER_CURSOR_ASOF;
1875 error = hammer_ip_lookup(&cursor);
1877 error = hammer_ip_resolve_data(&cursor);
1879 KKASSERT(cursor.leaf->data_len >=
1880 HAMMER_SYMLINK_NAME_OFF);
1881 error = uiomove(cursor.data->symlink.name,
1882 cursor.leaf->data_len -
1883 HAMMER_SYMLINK_NAME_OFF,
1887 hammer_done_cursor(&cursor);
1888 hammer_done_transaction(&trans);
1889 lwkt_reltoken(&hmp->fs_token);
1894 * hammer_vop_nremove { nch, dvp, cred }
1898 hammer_vop_nremove(struct vop_nremove_args *ap)
1900 struct hammer_transaction trans;
1901 struct hammer_inode *dip;
1905 dip = VTOI(ap->a_dvp);
1908 if (hammer_nohistory(dip) == 0 &&
1909 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
1913 lwkt_gettoken(&hmp->fs_token);
1914 hammer_start_transaction(&trans, hmp);
1915 ++hammer_stats_file_iopsw;
1916 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0);
1917 hammer_done_transaction(&trans);
1919 hammer_knote(ap->a_dvp, NOTE_WRITE);
1920 lwkt_reltoken(&hmp->fs_token);
1925 * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1929 hammer_vop_nrename(struct vop_nrename_args *ap)
1931 struct hammer_transaction trans;
1932 struct namecache *fncp;
1933 struct namecache *tncp;
1934 struct hammer_inode *fdip;
1935 struct hammer_inode *tdip;
1936 struct hammer_inode *ip;
1938 struct hammer_cursor cursor;
1940 uint32_t max_iterations;
1943 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount)
1945 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
1948 fdip = VTOI(ap->a_fdvp);
1949 tdip = VTOI(ap->a_tdvp);
1950 fncp = ap->a_fnch->ncp;
1951 tncp = ap->a_tnch->ncp;
1952 ip = VTOI(fncp->nc_vp);
1953 KKASSERT(ip != NULL);
1957 if (fdip->obj_localization != tdip->obj_localization)
1959 if (fdip->obj_localization != ip->obj_localization)
1962 if (fdip->flags & HAMMER_INODE_RO)
1964 if (tdip->flags & HAMMER_INODE_RO)
1966 if (ip->flags & HAMMER_INODE_RO)
1968 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
1971 lwkt_gettoken(&hmp->fs_token);
1972 hammer_start_transaction(&trans, hmp);
1973 ++hammer_stats_file_iopsw;
1976 * Remove tncp from the target directory and then link ip as
1977 * tncp. XXX pass trans to dounlink
1979 * Force the inode sync-time to match the transaction so it is
1980 * in-sync with the creation of the target directory entry.
1982 error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp,
1984 if (error == 0 || error == ENOENT) {
1985 error = hammer_ip_add_directory(&trans, tdip,
1986 tncp->nc_name, tncp->nc_nlen,
1989 ip->ino_data.parent_obj_id = tdip->obj_id;
1990 ip->ino_data.ctime = trans.time;
1991 hammer_modify_inode(&trans, ip, HAMMER_INODE_DDIRTY);
1995 goto failed; /* XXX */
1998 * Locate the record in the originating directory and remove it.
2000 * Calculate the namekey and setup the key range for the scan. This
2001 * works kinda like a chained hash table where the lower 32 bits
2002 * of the namekey synthesize the chain.
2004 * The key range is inclusive of both key_beg and key_end.
2006 namekey = hammer_directory_namekey(fdip, fncp->nc_name, fncp->nc_nlen,
2009 hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip);
2010 cursor.key_beg.localization = fdip->obj_localization +
2011 hammer_dir_localization(fdip);
2012 cursor.key_beg.obj_id = fdip->obj_id;
2013 cursor.key_beg.key = namekey;
2014 cursor.key_beg.create_tid = 0;
2015 cursor.key_beg.delete_tid = 0;
2016 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
2017 cursor.key_beg.obj_type = 0;
2019 cursor.key_end = cursor.key_beg;
2020 cursor.key_end.key += max_iterations;
2021 cursor.asof = fdip->obj_asof;
2022 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
2025 * Scan all matching records (the chain), locate the one matching
2026 * the requested path component.
2028 * The hammer_ip_*() functions merge in-memory records with on-disk
2029 * records for the purposes of the search.
2031 error = hammer_ip_first(&cursor);
2032 while (error == 0) {
2033 if (hammer_ip_resolve_data(&cursor) != 0)
2035 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
2037 if (fncp->nc_nlen == nlen &&
2038 bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) {
2041 error = hammer_ip_next(&cursor);
2045 * If all is ok we have to get the inode so we can adjust nlinks.
2047 * WARNING: hammer_ip_del_directory() may have to terminate the
2048 * cursor to avoid a recursion. It's ok to call hammer_done_cursor()
2052 error = hammer_ip_del_directory(&trans, &cursor, fdip, ip);
2055 * XXX A deadlock here will break rename's atomicy for the purposes
2056 * of crash recovery.
2058 if (error == EDEADLK) {
2059 hammer_done_cursor(&cursor);
2064 * Cleanup and tell the kernel that the rename succeeded.
2066 * NOTE: ip->vp, if non-NULL, cannot be directly referenced
2067 * without formally acquiring the vp since the vp might
2068 * have zero refs on it, or in the middle of a reclaim,
2071 hammer_done_cursor(&cursor);
2073 cache_rename(ap->a_fnch, ap->a_tnch);
2074 hammer_knote(ap->a_fdvp, NOTE_WRITE);
2075 hammer_knote(ap->a_tdvp, NOTE_WRITE);
2079 error = hammer_get_vnode(ip, &vp);
2080 if (error == 0 && vp) {
2082 hammer_knote(ip->vp, NOTE_RENAME);
2086 hdkprintf("ip/vp race2 avoided\n");
2091 hammer_done_transaction(&trans);
2092 lwkt_reltoken(&hmp->fs_token);
2097 * hammer_vop_nrmdir { nch, dvp, cred }
2101 hammer_vop_nrmdir(struct vop_nrmdir_args *ap)
2103 struct hammer_transaction trans;
2104 struct hammer_inode *dip;
2108 dip = VTOI(ap->a_dvp);
2111 if (hammer_nohistory(dip) == 0 &&
2112 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
2116 lwkt_gettoken(&hmp->fs_token);
2117 hammer_start_transaction(&trans, hmp);
2118 ++hammer_stats_file_iopsw;
2119 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1);
2120 hammer_done_transaction(&trans);
2122 hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
2123 lwkt_reltoken(&hmp->fs_token);
2128 * hammer_vop_markatime { vp, cred }
2132 hammer_vop_markatime(struct vop_markatime_args *ap)
2134 struct hammer_transaction trans;
2135 struct hammer_inode *ip;
2138 ip = VTOI(ap->a_vp);
2139 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
2141 if (ip->flags & HAMMER_INODE_RO)
2144 if (hmp->mp->mnt_flag & MNT_NOATIME)
2146 lwkt_gettoken(&hmp->fs_token);
2147 hammer_start_transaction(&trans, hmp);
2148 ++hammer_stats_file_iopsw;
2150 ip->ino_data.atime = trans.time;
2151 hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME);
2152 hammer_done_transaction(&trans);
2153 hammer_knote(ap->a_vp, NOTE_ATTRIB);
2154 lwkt_reltoken(&hmp->fs_token);
2159 * hammer_vop_setattr { vp, vap, cred }
2163 hammer_vop_setattr(struct vop_setattr_args *ap)
2165 struct hammer_transaction trans;
2166 struct hammer_inode *ip;
2175 int64_t aligned_size;
2180 ip = ap->a_vp->v_data;
2185 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
2187 if (ip->flags & HAMMER_INODE_RO)
2189 if (hammer_nohistory(ip) == 0 &&
2190 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) {
2194 lwkt_gettoken(&hmp->fs_token);
2195 hammer_start_transaction(&trans, hmp);
2196 ++hammer_stats_file_iopsw;
2199 if (vap->va_flags != VNOVAL) {
2200 flags = ip->ino_data.uflags;
2201 error = vop_helper_setattr_flags(&flags, vap->va_flags,
2202 hammer_to_unix_xid(&ip->ino_data.uid),
2205 if (ip->ino_data.uflags != flags) {
2206 ip->ino_data.uflags = flags;
2207 ip->ino_data.ctime = trans.time;
2208 modflags |= HAMMER_INODE_DDIRTY;
2209 kflags |= NOTE_ATTRIB;
2211 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
2218 if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) {
2222 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
2223 mode_t cur_mode = ip->ino_data.mode;
2224 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
2225 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
2229 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
2231 &cur_uid, &cur_gid, &cur_mode);
2233 hammer_guid_to_uuid(&uuid_uid, cur_uid);
2234 hammer_guid_to_uuid(&uuid_gid, cur_gid);
2235 if (bcmp(&uuid_uid, &ip->ino_data.uid,
2236 sizeof(uuid_uid)) ||
2237 bcmp(&uuid_gid, &ip->ino_data.gid,
2238 sizeof(uuid_gid)) ||
2239 ip->ino_data.mode != cur_mode) {
2240 ip->ino_data.uid = uuid_uid;
2241 ip->ino_data.gid = uuid_gid;
2242 ip->ino_data.mode = cur_mode;
2243 ip->ino_data.ctime = trans.time;
2244 modflags |= HAMMER_INODE_DDIRTY;
2246 kflags |= NOTE_ATTRIB;
2249 while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) {
2250 switch(ap->a_vp->v_type) {
2252 if (vap->va_size == ip->ino_data.size)
2256 * Log the operation if in fast-fsync mode or if
2257 * there are unterminated redo write records present.
2259 * The second check is needed so the recovery code
2260 * properly truncates write redos even if nominal
2261 * REDO operations is turned off due to excessive
2262 * writes, because the related records might be
2263 * destroyed and never lay down a TERM_WRITE.
2265 if ((ip->flags & HAMMER_INODE_REDO) ||
2266 (ip->flags & HAMMER_INODE_RDIRTY)) {
2267 error = hammer_generate_redo(&trans, ip,
2272 blksize = hammer_blocksize(vap->va_size);
2275 * XXX break atomicy, we can deadlock the backend
2276 * if we do not release the lock. Probably not a
2279 if (vap->va_size < ip->ino_data.size) {
2280 nvtruncbuf(ap->a_vp, vap->va_size,
2282 hammer_blockoff(vap->va_size),
2285 kflags |= NOTE_WRITE;
2287 nvextendbuf(ap->a_vp,
2290 hammer_blocksize(ip->ino_data.size),
2291 hammer_blocksize(vap->va_size),
2292 hammer_blockoff(ip->ino_data.size),
2293 hammer_blockoff(vap->va_size),
2296 kflags |= NOTE_WRITE | NOTE_EXTEND;
2298 ip->ino_data.size = vap->va_size;
2299 ip->ino_data.mtime = trans.time;
2300 /* XXX safe to use SDIRTY instead of DDIRTY here? */
2301 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY;
2304 * On-media truncation is cached in the inode until
2305 * the inode is synchronized. We must immediately
2306 * handle any frontend records.
2309 hammer_ip_frontend_trunc(ip, vap->va_size);
2310 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
2311 ip->flags |= HAMMER_INODE_TRUNCATED;
2312 ip->trunc_off = vap->va_size;
2313 hammer_inode_dirty(ip);
2314 } else if (ip->trunc_off > vap->va_size) {
2315 ip->trunc_off = vap->va_size;
2321 * When truncating, nvtruncbuf() may have cleaned out
2322 * a portion of the last block on-disk in the buffer
2323 * cache. We must clean out any frontend records
2324 * for blocks beyond the new last block.
2326 aligned_size = (vap->va_size + (blksize - 1)) &
2327 ~(int64_t)(blksize - 1);
2328 if (truncating && vap->va_size < aligned_size) {
2329 aligned_size -= blksize;
2330 hammer_ip_frontend_trunc(ip, aligned_size);
2335 if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) {
2336 ip->flags |= HAMMER_INODE_TRUNCATED;
2337 ip->trunc_off = vap->va_size;
2338 hammer_inode_dirty(ip);
2339 } else if (ip->trunc_off > vap->va_size) {
2340 ip->trunc_off = vap->va_size;
2342 hammer_ip_frontend_trunc(ip, vap->va_size);
2343 ip->ino_data.size = vap->va_size;
2344 ip->ino_data.mtime = trans.time;
2345 modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY;
2346 kflags |= NOTE_ATTRIB;
2354 if (vap->va_atime.tv_sec != VNOVAL) {
2355 ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime);
2356 modflags |= HAMMER_INODE_ATIME;
2357 kflags |= NOTE_ATTRIB;
2359 if (vap->va_mtime.tv_sec != VNOVAL) {
2360 ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime);
2361 modflags |= HAMMER_INODE_MTIME;
2362 kflags |= NOTE_ATTRIB;
2364 if (vap->va_mode != (mode_t)VNOVAL) {
2365 mode_t cur_mode = ip->ino_data.mode;
2366 uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid);
2367 gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid);
2369 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
2370 cur_uid, cur_gid, &cur_mode);
2371 if (error == 0 && ip->ino_data.mode != cur_mode) {
2372 ip->ino_data.mode = cur_mode;
2373 ip->ino_data.ctime = trans.time;
2374 modflags |= HAMMER_INODE_DDIRTY;
2375 kflags |= NOTE_ATTRIB;
2380 hammer_modify_inode(&trans, ip, modflags);
2381 hammer_done_transaction(&trans);
2382 hammer_knote(ap->a_vp, kflags);
2383 lwkt_reltoken(&hmp->fs_token);
2388 * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
2392 hammer_vop_nsymlink(struct vop_nsymlink_args *ap)
2394 struct hammer_transaction trans;
2395 struct hammer_inode *dip;
2396 struct hammer_inode *nip;
2397 hammer_record_t record;
2398 struct nchandle *nch;
2403 ap->a_vap->va_type = VLNK;
2406 dip = VTOI(ap->a_dvp);
2409 if (dip->flags & HAMMER_INODE_RO)
2411 if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0)
2415 * Create a transaction to cover the operations we perform.
2417 lwkt_gettoken(&hmp->fs_token);
2418 hammer_start_transaction(&trans, hmp);
2419 ++hammer_stats_file_iopsw;
2422 * Create a new filesystem object of the requested type. The
2423 * returned inode will be referenced but not locked.
2426 error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred,
2427 dip, nch->ncp->nc_name, nch->ncp->nc_nlen,
2430 hammer_done_transaction(&trans);
2432 lwkt_reltoken(&hmp->fs_token);
2437 * Add a record representing the symlink. symlink stores the link
2438 * as pure data, not a string, and is no \0 terminated.
2441 bytes = strlen(ap->a_target);
2443 if (bytes <= HAMMER_INODE_BASESYMLEN) {
2444 bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes);
2446 record = hammer_alloc_mem_record(nip, bytes);
2447 record->type = HAMMER_MEM_RECORD_GENERAL;
2449 record->leaf.base.localization = nip->obj_localization +
2450 HAMMER_LOCALIZE_MISC;
2451 record->leaf.base.key = HAMMER_FIXKEY_SYMLINK;
2452 record->leaf.base.rec_type = HAMMER_RECTYPE_FIX;
2453 record->leaf.data_len = bytes;
2454 KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0);
2455 bcopy(ap->a_target, record->data->symlink.name, bytes);
2456 error = hammer_ip_add_record(&trans, record);
2460 * Set the file size to the length of the link.
2463 nip->ino_data.size = bytes;
2464 hammer_modify_inode(&trans, nip, HAMMER_INODE_DDIRTY);
2468 error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name,
2469 nch->ncp->nc_nlen, nip);
2475 hammer_rel_inode(nip, 0);
2478 error = hammer_get_vnode(nip, ap->a_vpp);
2479 hammer_rel_inode(nip, 0);
2481 cache_setunresolved(ap->a_nch);
2482 cache_setvp(ap->a_nch, *ap->a_vpp);
2483 hammer_knote(ap->a_dvp, NOTE_WRITE);
2486 hammer_done_transaction(&trans);
2487 lwkt_reltoken(&hmp->fs_token);
2492 * hammer_vop_nwhiteout { nch, dvp, cred, flags }
2496 hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap)
2498 struct hammer_transaction trans;
2499 struct hammer_inode *dip;
2503 dip = VTOI(ap->a_dvp);
2506 if (hammer_nohistory(dip) == 0 &&
2507 (error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) {
2511 lwkt_gettoken(&hmp->fs_token);
2512 hammer_start_transaction(&trans, hmp);
2513 ++hammer_stats_file_iopsw;
2514 error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp,
2515 ap->a_cred, ap->a_flags, -1);
2516 hammer_done_transaction(&trans);
2517 lwkt_reltoken(&hmp->fs_token);
2523 * hammer_vop_ioctl { vp, command, data, fflag, cred }
2527 hammer_vop_ioctl(struct vop_ioctl_args *ap)
2529 struct hammer_inode *ip = ap->a_vp->v_data;
2530 hammer_mount_t hmp = ip->hmp;
2533 ++hammer_stats_file_iopsr;
2534 lwkt_gettoken(&hmp->fs_token);
2535 error = hammer_ioctl(ip, ap->a_command, ap->a_data,
2536 ap->a_fflag, ap->a_cred);
2537 lwkt_reltoken(&hmp->fs_token);
2543 hammer_vop_mountctl(struct vop_mountctl_args *ap)
2545 static const struct mountctl_opt extraopt[] = {
2546 { HMNT_NOHISTORY, "nohistory" },
2547 { HMNT_MASTERID, "master" },
2548 { HMNT_NOMIRROR, "nomirror" },
2552 struct hammer_mount *hmp;
2559 mp = ap->a_head.a_ops->head.vv_mount;
2560 KKASSERT(mp->mnt_data != NULL);
2561 hmp = (struct hammer_mount *)mp->mnt_data;
2563 lwkt_gettoken(&hmp->fs_token);
2566 case MOUNTCTL_SET_EXPORT:
2567 if (ap->a_ctllen != sizeof(struct export_args))
2570 error = hammer_vfs_export(mp, ap->a_op,
2571 (const struct export_args *)ap->a_ctl);
2573 case MOUNTCTL_MOUNTFLAGS:
2575 * Call standard mountctl VOP function
2576 * so we get user mount flags.
2578 error = vop_stdmountctl(ap);
2582 usedbytes = *ap->a_res;
2584 if (usedbytes > 0 && usedbytes < ap->a_buflen) {
2585 usedbytes += vfs_flagstostr(hmp->hflags, extraopt,
2587 ap->a_buflen - usedbytes,
2591 *ap->a_res += usedbytes;
2594 error = vop_stdmountctl(ap);
2597 lwkt_reltoken(&hmp->fs_token);
2602 * hammer_vop_strategy { vp, bio }
2604 * Strategy call, used for regular file read & write only. Note that the
2605 * bp may represent a cluster.
2607 * To simplify operation and allow better optimizations in the future,
2608 * this code does not make any assumptions with regards to buffer alignment
2613 hammer_vop_strategy(struct vop_strategy_args *ap)
2618 bp = ap->a_bio->bio_buf;
2622 error = hammer_vop_strategy_read(ap);
2625 error = hammer_vop_strategy_write(ap);
2628 bp->b_error = error = EINVAL;
2629 bp->b_flags |= B_ERROR;
2634 /* hammer_dump_dedup_cache(((hammer_inode_t)ap->a_vp->v_data)->hmp); */
2640 * Read from a regular file. Iterate the related records and fill in the
2641 * BIO/BUF. Gaps are zero-filled.
2643 * The support code in hammer_object.c should be used to deal with mixed
2644 * in-memory and on-disk records.
2646 * NOTE: Can be called from the cluster code with an oversized buf.
2652 hammer_vop_strategy_read(struct vop_strategy_args *ap)
2654 struct hammer_transaction trans;
2655 struct hammer_inode *ip;
2656 struct hammer_inode *dip;
2658 struct hammer_cursor cursor;
2659 hammer_base_elm_t base;
2660 hammer_off_t disk_offset;
2675 ip = ap->a_vp->v_data;
2679 * The zone-2 disk offset may have been set by the cluster code via
2680 * a BMAP operation, or else should be NOOFFSET.
2682 * Checking the high bits for a match against zone-2 should suffice.
2684 * In cases where a lot of data duplication is present it may be
2685 * more beneficial to drop through and doubule-buffer through the
2688 nbio = push_bio(bio);
2689 if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) ==
2690 HAMMER_ZONE_LARGE_DATA) {
2691 if (hammer_double_buffer == 0) {
2692 lwkt_gettoken(&hmp->fs_token);
2693 error = hammer_io_direct_read(hmp, nbio, NULL);
2694 lwkt_reltoken(&hmp->fs_token);
2699 * Try to shortcut requests for double_buffer mode too.
2700 * Since this mode runs through the device buffer cache
2701 * only compatible buffer sizes (meaning those generated
2702 * by normal filesystem buffers) are legal.
2704 if (hammer_live_dedup == 0 && (bp->b_flags & B_PAGING) == 0) {
2705 lwkt_gettoken(&hmp->fs_token);
2706 error = hammer_io_indirect_read(hmp, nbio, NULL);
2707 lwkt_reltoken(&hmp->fs_token);
2713 * Well, that sucked. Do it the hard way. If all the stars are
2714 * aligned we may still be able to issue a direct-read.
2716 lwkt_gettoken(&hmp->fs_token);
2717 hammer_simple_transaction(&trans, hmp);
2718 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
2721 * Key range (begin and end inclusive) to scan. Note that the key's
2722 * stored in the actual records represent BASE+LEN, not BASE. The
2723 * first record containing bio_offset will have a key > bio_offset.
2725 cursor.key_beg.localization = ip->obj_localization +
2726 HAMMER_LOCALIZE_MISC;
2727 cursor.key_beg.obj_id = ip->obj_id;
2728 cursor.key_beg.create_tid = 0;
2729 cursor.key_beg.delete_tid = 0;
2730 cursor.key_beg.obj_type = 0;
2731 cursor.key_beg.key = bio->bio_offset + 1;
2732 cursor.asof = ip->obj_asof;
2733 cursor.flags |= HAMMER_CURSOR_ASOF;
2735 cursor.key_end = cursor.key_beg;
2736 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
2738 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) {
2739 cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
2740 cursor.key_end.rec_type = HAMMER_RECTYPE_DB;
2741 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2745 ran_end = bio->bio_offset + bp->b_bufsize;
2746 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
2747 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
2748 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
2749 if (tmp64 < ran_end)
2750 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
2752 cursor.key_end.key = ran_end + MAXPHYS + 1;
2754 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
2757 * Set NOSWAPCACHE for cursor data extraction if double buffering
2758 * is disabled or (if the file is not marked cacheable via chflags
2759 * and vm.swapcache_use_chflags is enabled).
2761 if (hammer_double_buffer == 0 ||
2762 ((ap->a_vp->v_flag & VSWAPCACHE) == 0 &&
2763 vm_swapcache_use_chflags)) {
2764 cursor.flags |= HAMMER_CURSOR_NOSWAPCACHE;
2767 error = hammer_ip_first(&cursor);
2770 while (error == 0) {
2772 * Get the base file offset of the record. The key for
2773 * data records is (base + bytes) rather then (base).
2775 base = &cursor.leaf->base;
2776 rec_offset = base->key - cursor.leaf->data_len;
2779 * Calculate the gap, if any, and zero-fill it.
2781 * n is the offset of the start of the record verses our
2782 * current seek offset in the bio.
2784 n = (int)(rec_offset - (bio->bio_offset + boff));
2786 if (n > bp->b_bufsize - boff)
2787 n = bp->b_bufsize - boff;
2788 bzero((char *)bp->b_data + boff, n);
2794 * Calculate the data offset in the record and the number
2795 * of bytes we can copy.
2797 * There are two degenerate cases. First, boff may already
2798 * be at bp->b_bufsize. Secondly, the data offset within
2799 * the record may exceed the record's size.
2803 n = cursor.leaf->data_len - roff;
2805 hdkprintf("bad n=%d roff=%d\n", n, roff);
2807 } else if (n > bp->b_bufsize - boff) {
2808 n = bp->b_bufsize - boff;
2812 * Deal with cached truncations. This cool bit of code
2813 * allows truncate()/ftruncate() to avoid having to sync
2816 * If the frontend is truncated then all backend records are
2817 * subject to the frontend's truncation.
2819 * If the backend is truncated then backend records on-disk
2820 * (but not in-memory) are subject to the backend's
2821 * truncation. In-memory records owned by the backend
2822 * represent data written after the truncation point on the
2823 * backend and must not be truncated.
2825 * Truncate operations deal with frontend buffer cache
2826 * buffers and frontend-owned in-memory records synchronously.
2828 if (ip->flags & HAMMER_INODE_TRUNCATED) {
2829 if (hammer_cursor_ondisk(&cursor)/* ||
2830 cursor.iprec->flush_state == HAMMER_FST_FLUSH*/) {
2831 if (ip->trunc_off <= rec_offset)
2833 else if (ip->trunc_off < rec_offset + n)
2834 n = (int)(ip->trunc_off - rec_offset);
2837 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
2838 if (hammer_cursor_ondisk(&cursor)) {
2839 if (ip->sync_trunc_off <= rec_offset)
2841 else if (ip->sync_trunc_off < rec_offset + n)
2842 n = (int)(ip->sync_trunc_off - rec_offset);
2847 * Try to issue a direct read into our bio if possible,
2848 * otherwise resolve the element data into a hammer_buffer
2851 * The buffer on-disk should be zerod past any real
2852 * truncation point, but may not be for any synthesized
2853 * truncation point from above.
2855 * NOTE: disk_offset is only valid if the cursor data is
2858 disk_offset = cursor.leaf->data_offset + roff;
2859 isdedupable = (boff == 0 && n == bp->b_bufsize &&
2860 hammer_cursor_ondisk(&cursor) &&
2861 ((int)disk_offset & HAMMER_BUFMASK) == 0);
2863 if (isdedupable && hammer_double_buffer == 0) {
2867 KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) ==
2868 HAMMER_ZONE_LARGE_DATA);
2869 nbio->bio_offset = disk_offset;
2870 error = hammer_io_direct_read(hmp, nbio, cursor.leaf);
2871 if (hammer_live_dedup && error == 0)
2872 hammer_dedup_cache_add(ip, cursor.leaf);
2874 } else if (isdedupable) {
2876 * Async I/O case for reading from backing store
2877 * and copying the data to the filesystem buffer.
2878 * live-dedup has to verify the data anyway if it
2879 * gets a hit later so we can just add the entry
2882 KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) ==
2883 HAMMER_ZONE_LARGE_DATA);
2884 nbio->bio_offset = disk_offset;
2885 if (hammer_live_dedup)
2886 hammer_dedup_cache_add(ip, cursor.leaf);
2887 error = hammer_io_indirect_read(hmp, nbio, cursor.leaf);
2890 error = hammer_ip_resolve_data(&cursor);
2892 if (hammer_live_dedup && isdedupable)
2893 hammer_dedup_cache_add(ip, cursor.leaf);
2894 bcopy((char *)cursor.data + roff,
2895 (char *)bp->b_data + boff, n);
2902 * We have to be sure that the only elements added to the
2903 * dedup cache are those which are already on-media.
2905 if (hammer_live_dedup && hammer_cursor_ondisk(&cursor))
2906 hammer_dedup_cache_add(ip, cursor.leaf);
2909 * Iterate until we have filled the request.
2912 if (boff == bp->b_bufsize)
2914 error = hammer_ip_next(&cursor);
2918 * There may have been a gap after the last record
2920 if (error == ENOENT)
2922 if (error == 0 && boff != bp->b_bufsize) {
2923 KKASSERT(boff < bp->b_bufsize);
2924 bzero((char *)bp->b_data + boff, bp->b_bufsize - boff);
2925 /* boff = bp->b_bufsize; */
2929 * Disallow swapcache operation on the vnode buffer if double
2930 * buffering is enabled, the swapcache will get the data via
2931 * the block device buffer.
2933 if (hammer_double_buffer)
2934 bp->b_flags |= B_NOTMETA;
2940 bp->b_error = error;
2942 bp->b_flags |= B_ERROR;
2947 * Cache the b-tree node for the last data read in cache[1].
2949 * If we hit the file EOF then also cache the node in the
2950 * governing directory's cache[3], it will be used to initialize
2951 * the new inode's cache[1] for any inodes looked up via the directory.
2953 * This doesn't reduce disk accesses since the B-Tree chain is
2954 * likely cached, but it does reduce cpu overhead when looking
2955 * up file offsets for cpdup/tar/cpio style iterations.
2958 hammer_cache_node(&ip->cache[1], cursor.node);
2959 if (ran_end >= ip->ino_data.size) {
2960 dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id,
2961 ip->obj_asof, ip->obj_localization);
2963 hammer_cache_node(&dip->cache[3], cursor.node);
2964 hammer_rel_inode(dip, 0);
2967 hammer_done_cursor(&cursor);
2968 hammer_done_transaction(&trans);
2969 lwkt_reltoken(&hmp->fs_token);
2974 * BMAP operation - used to support cluster_read() only.
2976 * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb)
2978 * This routine may return EOPNOTSUPP if the opration is not supported for
2979 * the specified offset. The contents of the pointer arguments do not
2980 * need to be initialized in that case.
2982 * If a disk address is available and properly aligned return 0 with
2983 * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately
2984 * to the run-length relative to that offset. Callers may assume that
2985 * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently
2986 * large, so return EOPNOTSUPP if it is not sufficiently large.
2990 hammer_vop_bmap(struct vop_bmap_args *ap)
2992 struct hammer_transaction trans;
2993 struct hammer_inode *ip;
2995 struct hammer_cursor cursor;
2996 hammer_base_elm_t base;
3000 int64_t base_offset;
3001 int64_t base_disk_offset;
3002 int64_t last_offset;
3003 hammer_off_t last_disk_offset;
3004 hammer_off_t disk_offset;
3009 ++hammer_stats_file_iopsr;
3010 ip = ap->a_vp->v_data;
3014 * We can only BMAP regular files. We can't BMAP database files,
3017 if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE)
3021 * bmap is typically called with runp/runb both NULL when used
3022 * for writing. We do not support BMAP for writing atm.
3024 if (ap->a_cmd != BUF_CMD_READ)
3028 * Scan the B-Tree to acquire blockmap addresses, then translate
3031 lwkt_gettoken(&hmp->fs_token);
3032 hammer_simple_transaction(&trans, hmp);
3034 hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip);
3037 * Key range (begin and end inclusive) to scan. Note that the key's
3038 * stored in the actual records represent BASE+LEN, not BASE. The
3039 * first record containing bio_offset will have a key > bio_offset.
3041 cursor.key_beg.localization = ip->obj_localization +
3042 HAMMER_LOCALIZE_MISC;
3043 cursor.key_beg.obj_id = ip->obj_id;
3044 cursor.key_beg.create_tid = 0;
3045 cursor.key_beg.delete_tid = 0;
3046 cursor.key_beg.obj_type = 0;
3048 cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1;
3050 cursor.key_beg.key = ap->a_loffset + 1;
3051 if (cursor.key_beg.key < 0)
3052 cursor.key_beg.key = 0;
3053 cursor.asof = ip->obj_asof;
3054 cursor.flags |= HAMMER_CURSOR_ASOF;
3056 cursor.key_end = cursor.key_beg;
3057 KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE);
3059 ran_end = ap->a_loffset + MAXPHYS;
3060 cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
3061 cursor.key_end.rec_type = HAMMER_RECTYPE_DATA;
3062 tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */
3063 if (tmp64 < ran_end)
3064 cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL;
3066 cursor.key_end.key = ran_end + MAXPHYS + 1;
3068 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE;
3070 error = hammer_ip_first(&cursor);
3071 base_offset = last_offset = 0;
3072 base_disk_offset = last_disk_offset = 0;
3074 while (error == 0) {
3076 * Get the base file offset of the record. The key for
3077 * data records is (base + bytes) rather then (base).
3079 * NOTE: rec_offset + rec_len may exceed the end-of-file.
3080 * The extra bytes should be zero on-disk and the BMAP op
3081 * should still be ok.
3083 base = &cursor.leaf->base;
3084 rec_offset = base->key - cursor.leaf->data_len;
3085 rec_len = cursor.leaf->data_len;
3088 * Incorporate any cached truncation.
3090 * NOTE: Modifications to rec_len based on synthesized
3091 * truncation points remove the guarantee that any extended
3092 * data on disk is zero (since the truncations may not have
3093 * taken place on-media yet).
3095 if (ip->flags & HAMMER_INODE_TRUNCATED) {
3096 if (hammer_cursor_ondisk(&cursor) ||
3097 cursor.iprec->flush_state == HAMMER_FST_FLUSH) {
3098 if (ip->trunc_off <= rec_offset)
3100 else if (ip->trunc_off < rec_offset + rec_len)
3101 rec_len = (int)(ip->trunc_off - rec_offset);
3104 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) {
3105 if (hammer_cursor_ondisk(&cursor)) {
3106 if (ip->sync_trunc_off <= rec_offset)
3108 else if (ip->sync_trunc_off < rec_offset + rec_len)
3109 rec_len = (int)(ip->sync_trunc_off - rec_offset);
3114 * Accumulate information. If we have hit a discontiguous
3115 * block reset base_offset unless we are already beyond the
3116 * requested offset. If we are, that's it, we stop.
3120 if (hammer_cursor_ondisk(&cursor)) {
3121 disk_offset = cursor.leaf->data_offset;
3122 if (rec_offset != last_offset ||
3123 disk_offset != last_disk_offset) {
3124 if (rec_offset > ap->a_loffset)
3126 base_offset = rec_offset;
3127 base_disk_offset = disk_offset;
3129 last_offset = rec_offset + rec_len;
3130 last_disk_offset = disk_offset + rec_len;
3132 if (hammer_live_dedup)
3133 hammer_dedup_cache_add(ip, cursor.leaf);
3136 error = hammer_ip_next(&cursor);
3140 hammer_cache_node(&ip->cache[1], cursor.node);
3142 hammer_done_cursor(&cursor);
3143 hammer_done_transaction(&trans);
3144 lwkt_reltoken(&hmp->fs_token);
3147 * If we couldn't find any records or the records we did find were
3148 * all behind the requested offset, return failure. A forward
3149 * truncation can leave a hole w/ no on-disk records.
3151 if (last_offset == 0 || last_offset < ap->a_loffset)
3152 return (EOPNOTSUPP);
3155 * Figure out the block size at the requested offset and adjust
3156 * our limits so the cluster_read() does not create inappropriately
3157 * sized buffer cache buffers.
3159 blksize = hammer_blocksize(ap->a_loffset);
3160 if (hammer_blocksize(base_offset) != blksize) {
3161 base_offset = hammer_blockdemarc(base_offset, ap->a_loffset);
3163 if (last_offset != ap->a_loffset &&
3164 hammer_blocksize(last_offset - 1) != blksize) {
3165 last_offset = hammer_blockdemarc(ap->a_loffset,
3170 * Returning EOPNOTSUPP simply prevents the direct-IO optimization
3173 disk_offset = base_disk_offset + (ap->a_loffset - base_offset);
3175 if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) {
3177 * Only large-data zones can be direct-IOd
3180 } else if ((disk_offset & HAMMER_BUFMASK) ||
3181 (last_offset - ap->a_loffset) < blksize) {
3183 * doffsetp is not aligned or the forward run size does
3184 * not cover a whole buffer, disallow the direct I/O.
3191 *ap->a_doffsetp = disk_offset;
3193 *ap->a_runb = ap->a_loffset - base_offset;
3194 KKASSERT(*ap->a_runb >= 0);
3197 *ap->a_runp = last_offset - ap->a_loffset;
3198 KKASSERT(*ap->a_runp >= 0);
3206 * Write to a regular file. Because this is a strategy call the OS is
3207 * trying to actually get data onto the media.
3211 hammer_vop_strategy_write(struct vop_strategy_args *ap)
3213 hammer_record_t record;
3218 int blksize __debugvar;
3224 ip = ap->a_vp->v_data;
3227 blksize = hammer_blocksize(bio->bio_offset);
3228 KKASSERT(bp->b_bufsize == blksize);
3230 if (ip->flags & HAMMER_INODE_RO) {
3231 bp->b_error = EROFS;
3232 bp->b_flags |= B_ERROR;
3237 lwkt_gettoken(&hmp->fs_token);
3240 * Disallow swapcache operation on the vnode buffer if double
3241 * buffering is enabled, the swapcache will get the data via
3242 * the block device buffer.
3244 if (hammer_double_buffer)
3245 bp->b_flags |= B_NOTMETA;
3248 * Interlock with inode destruction (no in-kernel or directory
3249 * topology visibility). If we queue new IO while trying to
3250 * destroy the inode we can deadlock the vtrunc call in
3251 * hammer_inode_unloadable_check().
3253 * Besides, there's no point flushing a bp associated with an
3254 * inode that is being destroyed on-media and has no kernel
3257 if ((ip->flags | ip->sync_flags) &
3258 (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) {
3261 lwkt_reltoken(&hmp->fs_token);
3266 * Reserve space and issue a direct-write from the front-end.
3267 * NOTE: The direct_io code will hammer_bread/bcopy smaller
3270 * An in-memory record will be installed to reference the storage
3271 * until the flusher can get to it.
3273 * Since we own the high level bio the front-end will not try to
3274 * do a direct-read until the write completes.
3276 * NOTE: The only time we do not reserve a full-sized buffers
3277 * worth of data is if the file is small. We do not try to
3278 * allocate a fragment (from the small-data zone) at the end of
3279 * an otherwise large file as this can lead to wildly separated
3282 KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0);
3283 KKASSERT(bio->bio_offset < ip->ino_data.size);
3284 if (bio->bio_offset || ip->ino_data.size > HAMMER_HBUFSIZE)
3285 bytes = bp->b_bufsize;
3287 bytes = ((int)ip->ino_data.size + 15) & ~15;
3289 record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data,
3293 * B_VFSFLAG1 indicates that a REDO_WRITE entry was generated
3294 * in hammer_vop_write(). We must flag the record so the proper
3295 * REDO_TERM_WRITE entry is generated during the flush.
3298 if (bp->b_flags & B_VFSFLAG1) {
3299 record->flags |= HAMMER_RECF_REDO;
3300 bp->b_flags &= ~B_VFSFLAG1;
3302 if (record->flags & HAMMER_RECF_DEDUPED) {
3304 hammer_ip_replace_bulk(hmp, record);
3307 hammer_io_direct_write(hmp, bio, record);
3309 if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs)
3310 hammer_flush_inode(ip, 0);
3312 bp->b_bio2.bio_offset = NOOFFSET;
3313 bp->b_error = error;
3314 bp->b_flags |= B_ERROR;
3317 lwkt_reltoken(&hmp->fs_token);
3322 * dounlink - disconnect a directory entry
3324 * XXX whiteout support not really in yet
3327 hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch,
3328 struct vnode *dvp, struct ucred *cred,
3329 int flags, int isdir)
3331 struct namecache *ncp;
3335 struct hammer_cursor cursor;
3337 uint32_t max_iterations;
3341 * Calculate the namekey and setup the key range for the scan. This
3342 * works kinda like a chained hash table where the lower 32 bits
3343 * of the namekey synthesize the chain.
3345 * The key range is inclusive of both key_beg and key_end.
3351 if (dip->flags & HAMMER_INODE_RO)
3354 namekey = hammer_directory_namekey(dip, ncp->nc_name, ncp->nc_nlen,
3357 hammer_init_cursor(trans, &cursor, &dip->cache[1], dip);
3358 cursor.key_beg.localization = dip->obj_localization +
3359 hammer_dir_localization(dip);
3360 cursor.key_beg.obj_id = dip->obj_id;
3361 cursor.key_beg.key = namekey;
3362 cursor.key_beg.create_tid = 0;
3363 cursor.key_beg.delete_tid = 0;
3364 cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
3365 cursor.key_beg.obj_type = 0;
3367 cursor.key_end = cursor.key_beg;
3368 cursor.key_end.key += max_iterations;
3369 cursor.asof = dip->obj_asof;
3370 cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
3373 * Scan all matching records (the chain), locate the one matching
3374 * the requested path component. info->last_error contains the
3375 * error code on search termination and could be 0, ENOENT, or
3378 * The hammer_ip_*() functions merge in-memory records with on-disk
3379 * records for the purposes of the search.
3381 error = hammer_ip_first(&cursor);
3383 while (error == 0) {
3384 error = hammer_ip_resolve_data(&cursor);
3387 nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF;
3389 if (ncp->nc_nlen == nlen &&
3390 bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) {
3393 error = hammer_ip_next(&cursor);
3397 * If all is ok we have to get the inode so we can adjust nlinks.
3398 * To avoid a deadlock with the flusher we must release the inode
3399 * lock on the directory when acquiring the inode for the entry.
3401 * If the target is a directory, it must be empty.
3404 hammer_unlock(&cursor.ip->lock);
3405 ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id,
3407 cursor.data->entry.localization,
3409 hammer_lock_sh(&cursor.ip->lock);
3410 if (error == ENOENT) {
3411 hkprintf("WARNING: Removing dirent w/missing inode "
3413 "\tobj_id = %016llx\n",
3415 (long long)cursor.data->entry.obj_id);
3420 * If isdir >= 0 we validate that the entry is or is not a
3421 * directory. If isdir < 0 we don't care.
3423 if (error == 0 && isdir >= 0 && ip) {
3425 ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) {
3427 } else if (isdir == 0 &&
3428 ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) {
3434 * If we are trying to remove a directory the directory must
3437 * The check directory code can loop and deadlock/retry. Our
3438 * own cursor's node locks must be released to avoid a 3-way
3439 * deadlock with the flusher if the check directory code
3442 * If any changes whatsoever have been made to the cursor
3443 * set EDEADLK and retry.
3445 * WARNING: See warnings in hammer_unlock_cursor()
3448 if (error == 0 && ip && ip->ino_data.obj_type ==
3449 HAMMER_OBJTYPE_DIRECTORY) {
3450 hammer_unlock_cursor(&cursor);
3451 error = hammer_ip_check_directory_empty(trans, ip);
3452 hammer_lock_cursor(&cursor);
3453 if (cursor.flags & HAMMER_CURSOR_RETEST) {
3454 hkprintf("Warning: avoided deadlock "
3462 * Delete the directory entry.
3464 * WARNING: hammer_ip_del_directory() may have to terminate
3465 * the cursor to avoid a deadlock. It is ok to call
3466 * hammer_done_cursor() twice.
3469 error = hammer_ip_del_directory(trans, &cursor,
3472 hammer_done_cursor(&cursor);
3475 * Tell the namecache that we are now unlinked.
3480 * NOTE: ip->vp, if non-NULL, cannot be directly
3481 * referenced without formally acquiring the
3482 * vp since the vp might have zero refs on it,
3483 * or in the middle of a reclaim, etc.
3485 * NOTE: The cache_setunresolved() can rip the vp
3486 * out from under us since the vp may not have
3487 * any refs, in which case ip->vp will be NULL
3490 while (ip && ip->vp) {
3493 error = hammer_get_vnode(ip, &vp);
3494 if (error == 0 && vp) {
3496 hammer_knote(ip->vp, NOTE_DELETE);
3499 * Don't do this, it can deadlock
3500 * on concurrent rm's of hardlinks.
3501 * Shouldn't be needed any more.
3503 cache_inval_vp(ip->vp, CINV_DESTROY);
3508 hdkprintf("ip/vp race1 avoided\n");
3512 hammer_rel_inode(ip, 0);
3514 hammer_done_cursor(&cursor);
3516 if (error == EDEADLK)
3522 /************************************************************************
3523 * FIFO AND SPECFS OPS *
3524 ************************************************************************
3528 hammer_vop_fifoclose (struct vop_close_args *ap)
3530 /* XXX update itimes */
3531 return (VOCALL(&fifo_vnode_vops, &ap->a_head));
3535 hammer_vop_fiforead (struct vop_read_args *ap)
3539 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
3540 /* XXX update access time */
3545 hammer_vop_fifowrite (struct vop_write_args *ap)
3549 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
3550 /* XXX update access time */
3556 hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap)
3560 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
3562 error = hammer_vop_kqfilter(ap);
3566 /************************************************************************
3568 ************************************************************************
3571 static void filt_hammerdetach(struct knote *kn);
3572 static int filt_hammerread(struct knote *kn, long hint);
3573 static int filt_hammerwrite(struct knote *kn, long hint);
3574 static int filt_hammervnode(struct knote *kn, long hint);
3576 static struct filterops hammerread_filtops =
3577 { FILTEROP_ISFD | FILTEROP_MPSAFE,
3578 NULL, filt_hammerdetach, filt_hammerread };
3579 static struct filterops hammerwrite_filtops =
3580 { FILTEROP_ISFD | FILTEROP_MPSAFE,
3581 NULL, filt_hammerdetach, filt_hammerwrite };
3582 static struct filterops hammervnode_filtops =
3583 { FILTEROP_ISFD | FILTEROP_MPSAFE,
3584 NULL, filt_hammerdetach, filt_hammervnode };
3588 hammer_vop_kqfilter(struct vop_kqfilter_args *ap)
3590 struct vnode *vp = ap->a_vp;
3591 struct knote *kn = ap->a_kn;
3593 switch (kn->kn_filter) {
3595 kn->kn_fop = &hammerread_filtops;
3598 kn->kn_fop = &hammerwrite_filtops;
3601 kn->kn_fop = &hammervnode_filtops;
3604 return (EOPNOTSUPP);
3607 kn->kn_hook = (caddr_t)vp;
3609 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
3615 filt_hammerdetach(struct knote *kn)
3617 struct vnode *vp = (void *)kn->kn_hook;
3619 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
3623 filt_hammerread(struct knote *kn, long hint)
3625 struct vnode *vp = (void *)kn->kn_hook;
3626 hammer_inode_t ip = VTOI(vp);
3627 hammer_mount_t hmp = ip->hmp;
3630 if (hint == NOTE_REVOKE) {
3631 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
3634 lwkt_gettoken(&hmp->fs_token); /* XXX use per-ip-token */
3635 off = ip->ino_data.size - kn->kn_fp->f_offset;
3636 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
3637 lwkt_reltoken(&hmp->fs_token);
3638 if (kn->kn_sfflags & NOTE_OLDAPI)
3640 return (kn->kn_data != 0);
3644 filt_hammerwrite(struct knote *kn, long hint)
3646 if (hint == NOTE_REVOKE)
3647 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
3653 filt_hammervnode(struct knote *kn, long hint)
3655 if (kn->kn_sfflags & hint)
3656 kn->kn_fflags |= hint;
3657 if (hint == NOTE_REVOKE) {
3658 kn->kn_flags |= (EV_EOF | EV_NODATA);
3661 return (kn->kn_fflags != 0);