2 * Copyright (c) 2011-2015 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@dragonflybsd.org>
6 * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
7 * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
19 * 3. Neither the name of The DragonFly Project nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific, prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
26 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
27 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
29 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
31 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
33 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * Kernel Filesystem interface
39 * NOTE! local ipdata pointers must be reloaded on any modifying operation
40 * to the inode as its underlying chain may have changed.
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/kernel.h>
46 #include <sys/fcntl.h>
49 #include <sys/namei.h>
50 #include <sys/mount.h>
51 #include <sys/vnode.h>
52 #include <sys/mountctl.h>
53 #include <sys/dirent.h>
55 #include <sys/objcache.h>
56 #include <sys/event.h>
58 #include <vfs/fifofs/fifo.h>
62 static int hammer2_read_file(hammer2_inode_t *ip, struct uio *uio,
64 static int hammer2_write_file(hammer2_inode_t *ip, struct uio *uio,
65 int ioflag, int seqcount);
66 static void hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize);
67 static void hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize);
69 struct objcache *cache_xops;
73 hammer2_knote(struct vnode *vp, int flags)
76 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags);
80 * Last reference to a vnode is going away but it is still cached.
84 hammer2_vop_inactive(struct vop_inactive_args *ap)
101 * Check for deleted inodes and recycle immediately on the last
102 * release. Be sure to destroy any left-over buffer cache buffers
103 * so we do not waste time trying to flush them.
105 * Note that deleting the file block chains under the inode chain
106 * would just be a waste of energy, so don't do it.
108 * WARNING: nvtruncbuf() can only be safely called without the inode
109 * lock held due to the way our write thread works.
111 if (ip->flags & HAMMER2_INODE_ISUNLINKED) {
116 * Detect updates to the embedded data which may be
117 * synchronized by the strategy code. Simply mark the
118 * inode modified so it gets picked up by our normal flush.
120 nblksize = hammer2_calc_logical(ip, 0, &lbase, NULL);
121 nvtruncbuf(vp, 0, nblksize, 0, 0);
128 * Reclaim a vnode so that it can be reused; after the inode is
129 * disassociated, the filesystem must manage it alone.
133 hammer2_vop_reclaim(struct vop_reclaim_args *ap)
147 * The final close of a deleted file or directory marks it for
148 * destruction. The DELETED flag allows the flusher to shortcut
149 * any modified blocks still unflushed (that is, just ignore them).
151 * HAMMER2 usually does not try to optimize the freemap by returning
152 * deleted blocks to it as it does not usually know how many snapshots
153 * might be referencing portions of the file/dir.
159 * NOTE! We do not attempt to flush chains here, flushing is
160 * really fragile and could also deadlock.
165 * A modified inode may require chain synchronization. This
166 * synchronization is usually handled by VOP_SYNC / VOP_FSYNC
167 * when vfsync() is called. However, that requires a vnode.
169 * When the vnode is disassociated we must keep track of any modified
170 * inode via the sideq so that it is properly flushed. We cannot
171 * safely synchronize the inode from inside the reclaim due to
172 * potentially deep locks held as-of when the reclaim occurs.
173 * Interactions and potential deadlocks abound.
175 if ((ip->flags & (HAMMER2_INODE_ISUNLINKED |
176 HAMMER2_INODE_MODIFIED |
177 HAMMER2_INODE_RESIZED)) &&
178 (ip->flags & HAMMER2_INODE_ISDELETED) == 0) {
179 hammer2_inode_sideq_t *ipul;
181 ipul = kmalloc(sizeof(*ipul), pmp->minode, M_WAITOK | M_ZERO);
184 hammer2_spin_ex(&pmp->list_spin);
185 if ((ip->flags & HAMMER2_INODE_ONSIDEQ) == 0) {
187 atomic_set_int(&ip->flags, HAMMER2_INODE_ONSIDEQ);
188 TAILQ_INSERT_TAIL(&pmp->sideq, ipul, entry);
190 hammer2_spin_unex(&pmp->list_spin);
192 hammer2_spin_unex(&pmp->list_spin);
193 kfree(ipul, pmp->minode);
194 hammer2_inode_drop(ip); /* vp ref */
196 /* retain ref from vp for ipul */
198 hammer2_inode_drop(ip); /* vp ref */
202 * XXX handle background sync when ip dirty, kernel will no longer
203 * notify us regarding this inode because there is no longer a
204 * vnode attached to it.
211 * Currently this function synchronizes the front-end inode state to the
212 * backend chain topology, then flushes the inode's chain and sub-topology
213 * to backend media. This function does not flush the root topology down to
218 hammer2_vop_fsync(struct vop_fsync_args *ap)
229 hammer2_trans_init(ip->pmp, 0);
232 * Clean out buffer cache, wait for I/O's to complete.
234 vfsync(vp, ap->a_waitfor, 1, NULL, NULL);
235 bio_track_wait(&vp->v_track_write, 0, 0);
238 * Flush any inode changes
240 hammer2_inode_lock(ip, 0);
241 if (ip->flags & (HAMMER2_INODE_RESIZED|HAMMER2_INODE_MODIFIED))
242 error1 = hammer2_inode_chain_sync(ip);
245 * Flush dirty chains related to the inode.
247 * NOTE! XXX We do not currently flush to the volume root, ultimately
248 * we will want to have a shortcut for the flushed inode stored
249 * in the volume root for recovery purposes.
251 error2 = hammer2_inode_chain_flush(ip);
254 hammer2_inode_unlock(ip);
255 hammer2_trans_done(ip->pmp);
262 hammer2_vop_access(struct vop_access_args *ap)
264 hammer2_inode_t *ip = VTOI(ap->a_vp);
269 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
270 uid = hammer2_to_unix_xid(&ip->meta.uid);
271 gid = hammer2_to_unix_xid(&ip->meta.gid);
272 error = vop_helper_access(ap, uid, gid, ip->meta.mode, ip->meta.uflags);
273 hammer2_inode_unlock(ip);
280 hammer2_vop_getattr(struct vop_getattr_args *ap)
286 hammer2_chain_t *chain;
295 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
297 vap->va_fsid = pmp->mp->mnt_stat.f_fsid.val[0];
298 vap->va_fileid = ip->meta.inum;
299 vap->va_mode = ip->meta.mode;
300 vap->va_nlink = ip->meta.nlinks;
301 vap->va_uid = hammer2_to_unix_xid(&ip->meta.uid);
302 vap->va_gid = hammer2_to_unix_xid(&ip->meta.gid);
305 vap->va_size = ip->meta.size; /* protected by shared lock */
306 vap->va_blocksize = HAMMER2_PBUFSIZE;
307 vap->va_flags = ip->meta.uflags;
308 hammer2_time_to_timespec(ip->meta.ctime, &vap->va_ctime);
309 hammer2_time_to_timespec(ip->meta.mtime, &vap->va_mtime);
310 hammer2_time_to_timespec(ip->meta.mtime, &vap->va_atime);
313 if (ip->meta.type == HAMMER2_OBJTYPE_DIRECTORY) {
315 * Can't really calculate directory use sans the files under
316 * it, just assume one block for now.
318 vap->va_bytes += HAMMER2_INODE_BYTES;
320 for (i = 0; i < ip->cluster.nchains; ++i) {
321 if ((chain = ip->cluster.array[i].chain) != NULL) {
323 chain->bref.embed.stats.data_count) {
325 chain->bref.embed.stats.data_count;
330 vap->va_type = hammer2_get_vtype(ip->meta.type);
332 vap->va_uid_uuid = ip->meta.uid;
333 vap->va_gid_uuid = ip->meta.gid;
334 vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID |
337 hammer2_inode_unlock(ip);
344 hammer2_vop_setattr(struct vop_setattr_args *ap)
355 hammer2_update_time(&ctime);
361 if (hammer2_vfs_enospace(ip, 0, ap->a_cred) > 1)
364 hammer2_pfs_memory_wait(ip->pmp);
365 hammer2_trans_init(ip->pmp, 0);
366 hammer2_inode_lock(ip, 0);
369 if (vap->va_flags != VNOVAL) {
372 flags = ip->meta.uflags;
373 error = vop_helper_setattr_flags(&flags, vap->va_flags,
374 hammer2_to_unix_xid(&ip->meta.uid),
377 if (ip->meta.uflags != flags) {
378 hammer2_inode_modify(ip);
379 ip->meta.uflags = flags;
380 ip->meta.ctime = ctime;
381 kflags |= NOTE_ATTRIB;
383 if (ip->meta.uflags & (IMMUTABLE | APPEND)) {
390 if (ip->meta.uflags & (IMMUTABLE | APPEND)) {
394 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
395 mode_t cur_mode = ip->meta.mode;
396 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid);
397 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid);
401 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
403 &cur_uid, &cur_gid, &cur_mode);
405 hammer2_guid_to_uuid(&uuid_uid, cur_uid);
406 hammer2_guid_to_uuid(&uuid_gid, cur_gid);
407 if (bcmp(&uuid_uid, &ip->meta.uid, sizeof(uuid_uid)) ||
408 bcmp(&uuid_gid, &ip->meta.gid, sizeof(uuid_gid)) ||
409 ip->meta.mode != cur_mode
411 hammer2_inode_modify(ip);
412 ip->meta.uid = uuid_uid;
413 ip->meta.gid = uuid_gid;
414 ip->meta.mode = cur_mode;
415 ip->meta.ctime = ctime;
417 kflags |= NOTE_ATTRIB;
424 if (vap->va_size != VNOVAL && ip->meta.size != vap->va_size) {
427 if (vap->va_size == ip->meta.size)
429 if (vap->va_size < ip->meta.size) {
430 hammer2_mtx_ex(&ip->truncate_lock);
431 hammer2_truncate_file(ip, vap->va_size);
432 hammer2_mtx_unlock(&ip->truncate_lock);
433 kflags |= NOTE_WRITE;
435 hammer2_extend_file(ip, vap->va_size);
436 kflags |= NOTE_WRITE | NOTE_EXTEND;
438 hammer2_inode_modify(ip);
439 ip->meta.mtime = ctime;
440 vclrflags(vp, VLASTWRITETS);
448 /* atime not supported */
449 if (vap->va_atime.tv_sec != VNOVAL) {
450 hammer2_inode_modify(ip);
451 ip->meta.atime = hammer2_timespec_to_time(&vap->va_atime);
452 kflags |= NOTE_ATTRIB;
455 if (vap->va_mode != (mode_t)VNOVAL) {
456 mode_t cur_mode = ip->meta.mode;
457 uid_t cur_uid = hammer2_to_unix_xid(&ip->meta.uid);
458 gid_t cur_gid = hammer2_to_unix_xid(&ip->meta.gid);
460 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
461 cur_uid, cur_gid, &cur_mode);
462 if (error == 0 && ip->meta.mode != cur_mode) {
463 hammer2_inode_modify(ip);
464 ip->meta.mode = cur_mode;
465 ip->meta.ctime = ctime;
466 kflags |= NOTE_ATTRIB;
470 if (vap->va_mtime.tv_sec != VNOVAL) {
471 hammer2_inode_modify(ip);
472 ip->meta.mtime = hammer2_timespec_to_time(&vap->va_mtime);
473 kflags |= NOTE_ATTRIB;
474 vclrflags(vp, VLASTWRITETS);
479 * If a truncation occurred we must call chain_sync() now in order
480 * to trim the related data chains, otherwise a later expansion can
483 * If an extend occured that changed the DIRECTDATA state, we must
484 * call inode_fsync now in order to prepare the inode's indirect
487 * WARNING! This means we are making an adjustment to the inode's
488 * chain outside of sync/fsync, and not just to inode->meta, which
489 * may result in some consistency issues if a crash were to occur
490 * at just the wrong time.
492 if (ip->flags & HAMMER2_INODE_RESIZED)
493 hammer2_inode_chain_sync(ip);
498 hammer2_inode_unlock(ip);
499 hammer2_trans_done(ip->pmp);
500 hammer2_knote(ip->vp, kflags);
507 hammer2_vop_readdir(struct vop_readdir_args *ap)
509 hammer2_xop_readdir_t *xop;
510 hammer2_blockref_t bref;
525 saveoff = uio->uio_offset;
530 * Setup cookies directory entry cookies if requested
532 if (ap->a_ncookies) {
533 ncookies = uio->uio_resid / 16 + 1;
536 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
543 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
546 * Handle artificial entries. To ensure that only positive 64 bit
547 * quantities are returned to userland we always strip off bit 63.
548 * The hash code is designed such that codes 0x0000-0x7FFF are not
549 * used, allowing us to use these codes for articial entries.
551 * Entry 0 is used for '.' and entry 1 is used for '..'. Do not
552 * allow '..' to cross the mount point into (e.g.) the super-root.
555 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK;
556 r = vop_write_dirent(&error, uio, inum, DT_DIR, 1, ".");
560 cookies[cookie_index] = saveoff;
563 if (cookie_index == ncookies)
569 * Be careful with lockorder when accessing ".."
571 * (ip is the current dir. xip is the parent dir).
573 inum = ip->meta.inum & HAMMER2_DIRHASH_USERMSK;
574 if (ip != ip->pmp->iroot)
575 inum = ip->meta.iparent & HAMMER2_DIRHASH_USERMSK;
576 r = vop_write_dirent(&error, uio, inum, DT_DIR, 2, "..");
580 cookies[cookie_index] = saveoff;
583 if (cookie_index == ncookies)
587 lkey = saveoff | HAMMER2_DIRHASH_VISIBLE;
588 if (hammer2_debug & 0x0020)
589 kprintf("readdir: lkey %016jx\n", lkey);
594 * Use XOP for cluster scan.
596 * parent is the inode cluster, already locked for us. Don't
597 * double lock shared locks as this will screw up upgrades.
599 xop = hammer2_xop_alloc(ip, 0);
601 hammer2_xop_start(&xop->head, hammer2_xop_readdir);
604 const hammer2_inode_data_t *ripdata;
608 error = hammer2_xop_collect(&xop->head, 0);
609 error = hammer2_error_to_errno(error);
613 if (cookie_index == ncookies)
615 if (hammer2_debug & 0x0020)
616 kprintf("cluster chain %p %p\n",
617 xop->head.cluster.focus,
618 (xop->head.cluster.focus ?
619 xop->head.cluster.focus->data : (void *)-1));
620 hammer2_cluster_bref(&xop->head.cluster, &bref);
622 if (bref.type == HAMMER2_BREF_TYPE_INODE) {
624 &hammer2_cluster_rdata(&xop->head.cluster)->ipdata;
625 dtype = hammer2_get_dtype(ripdata->meta.type);
626 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
627 r = vop_write_dirent(&error, uio,
629 HAMMER2_DIRHASH_USERMSK,
631 ripdata->meta.name_len,
636 cookies[cookie_index] = saveoff;
638 } else if (bref.type == HAMMER2_BREF_TYPE_DIRENT) {
639 dtype = hammer2_get_dtype(bref.embed.dirent.type);
640 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
641 if (bref.embed.dirent.namlen <=
642 sizeof(bref.check.buf)) {
643 dname = bref.check.buf;
646 hammer2_cluster_rdata(&xop->head.cluster)->buf;
648 r = vop_write_dirent(&error, uio,
649 bref.embed.dirent.inum,
651 bref.embed.dirent.namlen,
656 cookies[cookie_index] = saveoff;
659 /* XXX chain error */
660 kprintf("bad chain type readdir %d\n", bref.type);
663 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
664 if (error == ENOENT) {
667 saveoff = (hammer2_key_t)-1;
669 saveoff = bref.key & HAMMER2_DIRHASH_USERMSK;
672 hammer2_inode_unlock(ip);
674 *ap->a_eofflag = eofflag;
675 if (hammer2_debug & 0x0020)
676 kprintf("readdir: done at %016jx\n", saveoff);
677 uio->uio_offset = saveoff & ~HAMMER2_DIRHASH_VISIBLE;
678 if (error && cookie_index == 0) {
680 kfree(cookies, M_TEMP);
682 *ap->a_cookies = NULL;
686 *ap->a_ncookies = cookie_index;
687 *ap->a_cookies = cookies;
694 * hammer2_vop_readlink { vp, uio, cred }
698 hammer2_vop_readlink(struct vop_readlink_args *ap)
705 if (vp->v_type != VLNK)
709 error = hammer2_read_file(ip, ap->a_uio, 0);
715 hammer2_vop_read(struct vop_read_args *ap)
725 * Read operations supported on this vnode?
728 if (vp->v_type != VREG)
738 seqcount = ap->a_ioflag >> 16;
739 bigread = (uio->uio_resid > 100 * 1024 * 1024);
741 error = hammer2_read_file(ip, uio, seqcount);
747 hammer2_vop_write(struct vop_write_args *ap)
758 * Read operations supported on this vnode?
761 if (vp->v_type != VREG)
768 ioflag = ap->a_ioflag;
773 switch (hammer2_vfs_enospace(ip, uio->uio_resid, ap->a_cred)) {
777 ioflag |= IO_DIRECT; /* semi-synchronous */
783 seqcount = ioflag >> 16;
786 * Check resource limit
788 if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc &&
789 uio->uio_offset + uio->uio_resid >
790 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
791 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
796 * The transaction interlocks against flush initiations
797 * (note: but will run concurrently with the actual flush).
799 * To avoid deadlocking against the VM system, we must flag any
800 * transaction related to the buffer cache or other direct
801 * VM page manipulation.
803 if (uio->uio_segflg == UIO_NOCOPY)
804 hammer2_trans_init(ip->pmp, HAMMER2_TRANS_BUFCACHE);
806 hammer2_trans_init(ip->pmp, 0);
807 error = hammer2_write_file(ip, uio, ioflag, seqcount);
808 hammer2_trans_done(ip->pmp);
814 * Perform read operations on a file or symlink given an UNLOCKED
817 * The passed ip is not locked.
821 hammer2_read_file(hammer2_inode_t *ip, struct uio *uio, int seqcount)
832 * WARNING! Assumes that the kernel interlocks size changes at the
835 hammer2_mtx_sh(&ip->lock);
836 hammer2_mtx_sh(&ip->truncate_lock);
837 size = ip->meta.size;
838 hammer2_mtx_unlock(&ip->lock);
840 while (uio->uio_resid > 0 && uio->uio_offset < size) {
847 lblksize = hammer2_calc_logical(ip, uio->uio_offset,
852 error = cluster_readx(ip->vp, leof, lbase, lblksize,
853 B_NOTMETA | B_KVABIO,
858 if (uio->uio_segflg == UIO_NOCOPY) {
859 bp = getblk(ip->vp, lbase, lblksize,
860 GETBLK_BHEAVY | GETBLK_KVABIO, 0);
861 if (bp->b_flags & B_CACHE) {
864 if (bp->b_xio.xio_npages != 16)
865 kprintf("NPAGES BAD\n");
866 for (i = 0; i < bp->b_xio.xio_npages; ++i) {
868 m = bp->b_xio.xio_pages[i];
869 if (m == NULL || m->valid == 0) {
870 kprintf("bp %016jx %016jx pg %d inv",
873 kprintf("m->object %p/%p", m->object, ip->vp->v_object);
879 kprintf("b_flags %08x, b_error %d\n", bp->b_flags, bp->b_error);
883 error = bread_kvabio(ip->vp, lbase, lblksize, &bp);
890 loff = (int)(uio->uio_offset - lbase);
892 if (n > uio->uio_resid)
894 if (n > size - uio->uio_offset)
895 n = (int)(size - uio->uio_offset);
896 bp->b_flags |= B_AGE;
897 uiomovebp(bp, (char *)bp->b_data + loff, n, uio);
900 hammer2_mtx_unlock(&ip->truncate_lock);
906 * Write to the file represented by the inode via the logical buffer cache.
907 * The inode may represent a regular file or a symlink.
909 * The inode must not be locked.
913 hammer2_write_file(hammer2_inode_t *ip, struct uio *uio,
914 int ioflag, int seqcount)
916 hammer2_key_t old_eof;
917 hammer2_key_t new_eof;
926 * WARNING! Assumes that the kernel interlocks size changes at the
929 hammer2_mtx_ex(&ip->lock);
930 hammer2_mtx_sh(&ip->truncate_lock);
931 if (ioflag & IO_APPEND)
932 uio->uio_offset = ip->meta.size;
933 old_eof = ip->meta.size;
936 * Extend the file if necessary. If the write fails at some point
937 * we will truncate it back down to cover as much as we were able
940 * Doing this now makes it easier to calculate buffer sizes in
947 if (uio->uio_offset + uio->uio_resid > old_eof) {
948 new_eof = uio->uio_offset + uio->uio_resid;
950 hammer2_extend_file(ip, new_eof);
951 kflags |= NOTE_EXTEND;
955 hammer2_mtx_unlock(&ip->lock);
960 while (uio->uio_resid > 0) {
969 * Don't allow the buffer build to blow out the buffer
972 if ((ioflag & IO_RECURSE) == 0)
973 bwillwrite(HAMMER2_PBUFSIZE);
976 * This nominally tells us how much we can cluster and
977 * what the logical buffer size needs to be. Currently
978 * we don't try to cluster the write and just handle one
981 lblksize = hammer2_calc_logical(ip, uio->uio_offset,
983 loff = (int)(uio->uio_offset - lbase);
985 KKASSERT(lblksize <= 65536);
988 * Calculate bytes to copy this transfer and whether the
989 * copy completely covers the buffer or not.
993 if (n > uio->uio_resid) {
995 if (loff == lbase && uio->uio_offset + n == new_eof)
1003 if (lbase >= new_eof)
1009 if (uio->uio_segflg == UIO_NOCOPY) {
1011 * Issuing a write with the same data backing the
1012 * buffer. Instantiate the buffer to collect the
1013 * backing vm pages, then read-in any missing bits.
1015 * This case is used by vop_stdputpages().
1017 bp = getblk(ip->vp, lbase, lblksize,
1018 GETBLK_BHEAVY | GETBLK_KVABIO, 0);
1019 if ((bp->b_flags & B_CACHE) == 0) {
1021 error = bread_kvabio(ip->vp, lbase,
1024 } else if (trivial) {
1026 * Even though we are entirely overwriting the buffer
1027 * we may still have to zero it out to avoid a
1028 * mmap/write visibility issue.
1030 bp = getblk(ip->vp, lbase, lblksize,
1031 GETBLK_BHEAVY | GETBLK_KVABIO, 0);
1032 if ((bp->b_flags & B_CACHE) == 0)
1036 * Partial overwrite, read in any missing bits then
1037 * replace the portion being written.
1039 * (The strategy code will detect zero-fill physical
1040 * blocks for this case).
1042 error = bread_kvabio(ip->vp, lbase, lblksize, &bp);
1053 * Ok, copy the data in
1056 error = uiomovebp(bp, bp->b_data + loff, n, uio);
1057 kflags |= NOTE_WRITE;
1065 * WARNING: Pageout daemon will issue UIO_NOCOPY writes
1066 * with IO_SYNC or IO_ASYNC set. These writes
1067 * must be handled as the pageout daemon expects.
1069 * NOTE! H2 relies on cluster_write() here because it
1070 * cannot preallocate disk blocks at the logical
1071 * level due to not knowing what the compression
1072 * size will be at this time.
1074 * We must use cluster_write() here and we depend
1075 * on the write-behind feature to flush buffers
1076 * appropriately. If we let the buffer daemons do
1077 * it the block allocations will be all over the
1080 if (ioflag & IO_SYNC) {
1082 } else if ((ioflag & IO_DIRECT) && endofblk) {
1084 } else if (ioflag & IO_ASYNC) {
1086 } else if (ip->vp->v_mount->mnt_flag & MNT_NOCLUSTERW) {
1090 bp->b_flags |= B_CLUSTEROK;
1091 cluster_write(bp, new_eof, lblksize, seqcount);
1093 bp->b_flags |= B_CLUSTEROK;
1100 * Cleanup. If we extended the file EOF but failed to write through
1101 * the entire write is a failure and we have to back-up.
1103 if (error && new_eof != old_eof) {
1104 hammer2_mtx_unlock(&ip->truncate_lock);
1105 hammer2_mtx_ex(&ip->lock);
1106 hammer2_mtx_ex(&ip->truncate_lock);
1107 hammer2_truncate_file(ip, old_eof);
1108 if (ip->flags & HAMMER2_INODE_MODIFIED)
1109 hammer2_inode_chain_sync(ip);
1110 hammer2_mtx_unlock(&ip->lock);
1111 } else if (modified) {
1112 struct vnode *vp = ip->vp;
1114 hammer2_mtx_ex(&ip->lock);
1115 hammer2_inode_modify(ip);
1116 if (uio->uio_segflg == UIO_NOCOPY) {
1117 if (vp->v_flag & VLASTWRITETS) {
1119 (unsigned long)vp->v_lastwrite_ts.tv_sec *
1121 vp->v_lastwrite_ts.tv_nsec / 1000;
1124 hammer2_update_time(&ip->meta.mtime);
1125 vclrflags(vp, VLASTWRITETS);
1130 * REMOVED - handled by hammer2_extend_file(). Do not issue
1131 * a chain_sync() outside of a sync/fsync except for DIRECTDATA
1134 * Under normal conditions we only issue a chain_sync if
1135 * the inode's DIRECTDATA state changed.
1137 if (ip->flags & HAMMER2_INODE_RESIZED)
1138 hammer2_inode_chain_sync(ip);
1140 hammer2_mtx_unlock(&ip->lock);
1141 hammer2_knote(ip->vp, kflags);
1143 hammer2_trans_assert_strategy(ip->pmp);
1144 hammer2_mtx_unlock(&ip->truncate_lock);
1150 * Truncate the size of a file. The inode must not be locked.
1152 * We must unconditionally set HAMMER2_INODE_RESIZED to properly
1153 * ensure that any on-media data beyond the new file EOF has been destroyed.
1155 * WARNING: nvtruncbuf() can only be safely called without the inode lock
1156 * held due to the way our write thread works. If the truncation
1157 * occurs in the middle of a buffer, nvtruncbuf() is responsible
1158 * for dirtying that buffer and zeroing out trailing bytes.
1160 * WARNING! Assumes that the kernel interlocks size changes at the
1163 * WARNING! Caller assumes responsibility for removing dead blocks
1164 * if INODE_RESIZED is set.
1168 hammer2_truncate_file(hammer2_inode_t *ip, hammer2_key_t nsize)
1170 hammer2_key_t lbase;
1173 hammer2_mtx_unlock(&ip->lock);
1175 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL);
1176 nvtruncbuf(ip->vp, nsize,
1177 nblksize, (int)nsize & (nblksize - 1),
1180 hammer2_mtx_ex(&ip->lock);
1181 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0);
1182 ip->osize = ip->meta.size;
1183 ip->meta.size = nsize;
1184 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED);
1185 hammer2_inode_modify(ip);
1189 * Extend the size of a file. The inode must not be locked.
1191 * Even though the file size is changing, we do not have to set the
1192 * INODE_RESIZED bit unless the file size crosses the EMBEDDED_BYTES
1193 * boundary. When this occurs a hammer2_inode_chain_sync() is required
1194 * to prepare the inode cluster's indirect block table, otherwise
1195 * async execution of the strategy code will implode on us.
1197 * WARNING! Assumes that the kernel interlocks size changes at the
1200 * WARNING! Caller assumes responsibility for transitioning out
1201 * of the inode DIRECTDATA mode if INODE_RESIZED is set.
1205 hammer2_extend_file(hammer2_inode_t *ip, hammer2_key_t nsize)
1207 hammer2_key_t lbase;
1208 hammer2_key_t osize;
1212 KKASSERT((ip->flags & HAMMER2_INODE_RESIZED) == 0);
1213 hammer2_inode_modify(ip);
1214 osize = ip->meta.size;
1216 ip->meta.size = nsize;
1219 * We must issue a chain_sync() when the DIRECTDATA state changes
1220 * to prevent confusion between the flush code and the in-memory
1221 * state. This is not perfect because we are doing it outside of
1222 * a sync/fsync operation, so it might not be fully synchronized
1223 * with the meta-data topology flush.
1225 if (osize <= HAMMER2_EMBEDDED_BYTES && nsize > HAMMER2_EMBEDDED_BYTES) {
1226 atomic_set_int(&ip->flags, HAMMER2_INODE_RESIZED);
1227 hammer2_inode_chain_sync(ip);
1230 hammer2_mtx_unlock(&ip->lock);
1232 oblksize = hammer2_calc_logical(ip, osize, &lbase, NULL);
1233 nblksize = hammer2_calc_logical(ip, nsize, &lbase, NULL);
1239 hammer2_mtx_ex(&ip->lock);
1244 hammer2_vop_nresolve(struct vop_nresolve_args *ap)
1246 hammer2_xop_nresolve_t *xop;
1247 hammer2_inode_t *ip;
1248 hammer2_inode_t *dip;
1249 struct namecache *ncp;
1253 dip = VTOI(ap->a_dvp);
1254 xop = hammer2_xop_alloc(dip, 0);
1256 ncp = ap->a_nch->ncp;
1257 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1260 * Note: In DragonFly the kernel handles '.' and '..'.
1262 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1263 hammer2_xop_start(&xop->head, hammer2_xop_nresolve);
1265 error = hammer2_xop_collect(&xop->head, 0);
1266 error = hammer2_error_to_errno(error);
1270 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1272 hammer2_inode_unlock(dip);
1275 * Acquire the related vnode
1277 * NOTE: For error processing, only ENOENT resolves the namecache
1278 * entry to NULL, otherwise we just return the error and
1279 * leave the namecache unresolved.
1281 * NOTE: multiple hammer2_inode structures can be aliased to the
1282 * same chain element, for example for hardlinks. This
1283 * use case does not 'reattach' inode associations that
1284 * might already exist, but always allocates a new one.
1286 * WARNING: inode structure is locked exclusively via inode_get
1287 * but chain was locked shared. inode_unlock()
1288 * will handle it properly.
1291 vp = hammer2_igetv(ip, &error); /* error set to UNIX error */
1294 cache_setvp(ap->a_nch, vp);
1295 } else if (error == ENOENT) {
1296 cache_setvp(ap->a_nch, NULL);
1298 hammer2_inode_unlock(ip);
1301 * The vp should not be released until after we've disposed
1302 * of our locks, because it might cause vop_inactive() to
1309 cache_setvp(ap->a_nch, NULL);
1311 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1312 KASSERT(error || ap->a_nch->ncp->nc_vp != NULL,
1313 ("resolve error %d/%p ap %p\n",
1314 error, ap->a_nch->ncp->nc_vp, ap));
1321 hammer2_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
1323 hammer2_inode_t *dip;
1327 dip = VTOI(ap->a_dvp);
1328 inum = dip->meta.iparent;
1332 error = hammer2_vfs_vget(ap->a_dvp->v_mount, NULL,
1342 hammer2_vop_nmkdir(struct vop_nmkdir_args *ap)
1344 hammer2_inode_t *dip;
1345 hammer2_inode_t *nip;
1346 struct namecache *ncp;
1347 const uint8_t *name;
1352 dip = VTOI(ap->a_dvp);
1353 if (dip->pmp->ronly)
1355 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1)
1358 ncp = ap->a_nch->ncp;
1359 name = ncp->nc_name;
1360 name_len = ncp->nc_nlen;
1362 hammer2_pfs_memory_wait(dip->pmp);
1363 hammer2_trans_init(dip->pmp, 0);
1365 inum = hammer2_trans_newinum(dip->pmp);
1368 * Create the actual inode as a hidden file in the iroot, then
1369 * create the directory entry. The creation of the actual inode
1370 * sets its nlinks to 1 which is the value we desire.
1372 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1377 error = hammer2_error_to_errno(error);
1379 error = hammer2_dirent_create(dip, name, name_len,
1380 nip->meta.inum, nip->meta.type);
1381 /* returns UNIX error code */
1385 hammer2_inode_unlink_finisher(nip, 0);
1386 hammer2_inode_unlock(nip);
1391 *ap->a_vpp = hammer2_igetv(nip, &error);
1392 hammer2_inode_unlock(nip);
1396 * Update dip's mtime
1398 * We can use a shared inode lock and allow the meta.mtime update
1399 * SMP race. hammer2_inode_modify() is MPSAFE w/a shared lock.
1404 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1405 hammer2_update_time(&mtime);
1406 hammer2_inode_modify(dip);
1407 dip->meta.mtime = mtime;
1408 hammer2_inode_unlock(dip);
1411 hammer2_trans_done(dip->pmp);
1414 cache_setunresolved(ap->a_nch);
1415 cache_setvp(ap->a_nch, *ap->a_vpp);
1416 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1423 hammer2_vop_open(struct vop_open_args *ap)
1425 return vop_stdopen(ap);
1429 * hammer2_vop_advlock { vp, id, op, fl, flags }
1433 hammer2_vop_advlock(struct vop_advlock_args *ap)
1435 hammer2_inode_t *ip = VTOI(ap->a_vp);
1438 size = ip->meta.size;
1439 return (lf_advlock(ap, &ip->advlock, size));
1444 hammer2_vop_close(struct vop_close_args *ap)
1446 return vop_stdclose(ap);
1450 * hammer2_vop_nlink { nch, dvp, vp, cred }
1452 * Create a hardlink from (vp) to {dvp, nch}.
1456 hammer2_vop_nlink(struct vop_nlink_args *ap)
1458 hammer2_inode_t *tdip; /* target directory to create link in */
1459 hammer2_inode_t *ip; /* inode we are hardlinking to */
1460 struct namecache *ncp;
1461 const uint8_t *name;
1465 if (ap->a_dvp->v_mount != ap->a_vp->v_mount)
1468 tdip = VTOI(ap->a_dvp);
1469 if (tdip->pmp->ronly)
1471 if (hammer2_vfs_enospace(tdip, 0, ap->a_cred) > 1)
1474 ncp = ap->a_nch->ncp;
1475 name = ncp->nc_name;
1476 name_len = ncp->nc_nlen;
1479 * ip represents the file being hardlinked. The file could be a
1480 * normal file or a hardlink target if it has already been hardlinked.
1481 * (with the new semantics, it will almost always be a hardlink
1484 * Bump nlinks and potentially also create or move the hardlink
1485 * target in the parent directory common to (ip) and (tdip). The
1486 * consolidation code can modify ip->cluster. The returned cluster
1489 ip = VTOI(ap->a_vp);
1490 KASSERT(ip->pmp, ("ip->pmp is NULL %p %p", ip, ip->pmp));
1491 hammer2_pfs_memory_wait(ip->pmp);
1492 hammer2_trans_init(ip->pmp, 0);
1495 * Target should be an indexed inode or there's no way we will ever
1496 * be able to find it!
1498 KKASSERT((ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE) == 0);
1503 * Can return NULL and error == EXDEV if the common parent
1504 * crosses a directory with the xlink flag set.
1506 hammer2_inode_lock(tdip, 0);
1507 hammer2_inode_lock(ip, 0);
1510 * Create the directory entry and bump nlinks.
1513 error = hammer2_dirent_create(tdip, name, name_len,
1514 ip->meta.inum, ip->meta.type);
1515 hammer2_inode_modify(ip);
1520 * Update dip's mtime
1524 hammer2_update_time(&mtime);
1525 hammer2_inode_modify(tdip);
1526 tdip->meta.mtime = mtime;
1528 cache_setunresolved(ap->a_nch);
1529 cache_setvp(ap->a_nch, ap->a_vp);
1531 hammer2_inode_unlock(ip);
1532 hammer2_inode_unlock(tdip);
1534 hammer2_trans_done(ip->pmp);
1535 hammer2_knote(ap->a_vp, NOTE_LINK);
1536 hammer2_knote(ap->a_dvp, NOTE_WRITE);
1542 * hammer2_vop_ncreate { nch, dvp, vpp, cred, vap }
1544 * The operating system has already ensured that the directory entry
1545 * does not exist and done all appropriate namespace locking.
1549 hammer2_vop_ncreate(struct vop_ncreate_args *ap)
1551 hammer2_inode_t *dip;
1552 hammer2_inode_t *nip;
1553 struct namecache *ncp;
1554 const uint8_t *name;
1559 dip = VTOI(ap->a_dvp);
1560 if (dip->pmp->ronly)
1562 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1)
1565 ncp = ap->a_nch->ncp;
1566 name = ncp->nc_name;
1567 name_len = ncp->nc_nlen;
1568 hammer2_pfs_memory_wait(dip->pmp);
1569 hammer2_trans_init(dip->pmp, 0);
1571 inum = hammer2_trans_newinum(dip->pmp);
1574 * Create the actual inode as a hidden file in the iroot, then
1575 * create the directory entry. The creation of the actual inode
1576 * sets its nlinks to 1 which is the value we desire.
1578 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1584 error = hammer2_error_to_errno(error);
1586 error = hammer2_dirent_create(dip, name, name_len,
1587 nip->meta.inum, nip->meta.type);
1591 hammer2_inode_unlink_finisher(nip, 0);
1592 hammer2_inode_unlock(nip);
1597 *ap->a_vpp = hammer2_igetv(nip, &error);
1598 hammer2_inode_unlock(nip);
1602 * Update dip's mtime
1607 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1608 hammer2_update_time(&mtime);
1609 hammer2_inode_modify(dip);
1610 dip->meta.mtime = mtime;
1611 hammer2_inode_unlock(dip);
1614 hammer2_trans_done(dip->pmp);
1617 cache_setunresolved(ap->a_nch);
1618 cache_setvp(ap->a_nch, *ap->a_vpp);
1619 hammer2_knote(ap->a_dvp, NOTE_WRITE);
1625 * Make a device node (typically a fifo)
1629 hammer2_vop_nmknod(struct vop_nmknod_args *ap)
1631 hammer2_inode_t *dip;
1632 hammer2_inode_t *nip;
1633 struct namecache *ncp;
1634 const uint8_t *name;
1639 dip = VTOI(ap->a_dvp);
1640 if (dip->pmp->ronly)
1642 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1)
1645 ncp = ap->a_nch->ncp;
1646 name = ncp->nc_name;
1647 name_len = ncp->nc_nlen;
1648 hammer2_pfs_memory_wait(dip->pmp);
1649 hammer2_trans_init(dip->pmp, 0);
1652 * Create the device inode and then create the directory entry.
1654 inum = hammer2_trans_newinum(dip->pmp);
1655 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1660 error = hammer2_dirent_create(dip, name, name_len,
1661 nip->meta.inum, nip->meta.type);
1665 hammer2_inode_unlink_finisher(nip, 0);
1666 hammer2_inode_unlock(nip);
1671 *ap->a_vpp = hammer2_igetv(nip, &error);
1672 hammer2_inode_unlock(nip);
1676 * Update dip's mtime
1681 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1682 hammer2_update_time(&mtime);
1683 hammer2_inode_modify(dip);
1684 dip->meta.mtime = mtime;
1685 hammer2_inode_unlock(dip);
1688 hammer2_trans_done(dip->pmp);
1691 cache_setunresolved(ap->a_nch);
1692 cache_setvp(ap->a_nch, *ap->a_vpp);
1693 hammer2_knote(ap->a_dvp, NOTE_WRITE);
1699 * hammer2_vop_nsymlink { nch, dvp, vpp, cred, vap, target }
1703 hammer2_vop_nsymlink(struct vop_nsymlink_args *ap)
1705 hammer2_inode_t *dip;
1706 hammer2_inode_t *nip;
1707 struct namecache *ncp;
1708 const uint8_t *name;
1713 dip = VTOI(ap->a_dvp);
1714 if (dip->pmp->ronly)
1716 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1)
1719 ncp = ap->a_nch->ncp;
1720 name = ncp->nc_name;
1721 name_len = ncp->nc_nlen;
1722 hammer2_pfs_memory_wait(dip->pmp);
1723 hammer2_trans_init(dip->pmp, 0);
1725 ap->a_vap->va_type = VLNK; /* enforce type */
1728 * Create the softlink as an inode and then create the directory
1731 inum = hammer2_trans_newinum(dip->pmp);
1733 nip = hammer2_inode_create(dip->pmp->iroot, dip, ap->a_vap, ap->a_cred,
1738 error = hammer2_dirent_create(dip, name, name_len,
1739 nip->meta.inum, nip->meta.type);
1743 hammer2_inode_unlink_finisher(nip, 0);
1744 hammer2_inode_unlock(nip);
1748 hammer2_trans_done(dip->pmp);
1751 *ap->a_vpp = hammer2_igetv(nip, &error);
1754 * Build the softlink (~like file data) and finalize the namecache.
1761 bytes = strlen(ap->a_target);
1763 hammer2_inode_unlock(nip);
1764 bzero(&auio, sizeof(auio));
1765 bzero(&aiov, sizeof(aiov));
1766 auio.uio_iov = &aiov;
1767 auio.uio_segflg = UIO_SYSSPACE;
1768 auio.uio_rw = UIO_WRITE;
1769 auio.uio_resid = bytes;
1770 auio.uio_iovcnt = 1;
1771 auio.uio_td = curthread;
1772 aiov.iov_base = ap->a_target;
1773 aiov.iov_len = bytes;
1774 error = hammer2_write_file(nip, &auio, IO_APPEND, 0);
1775 /* XXX handle error */
1778 hammer2_inode_unlock(nip);
1782 * Update dip's mtime
1787 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1788 hammer2_update_time(&mtime);
1789 hammer2_inode_modify(dip);
1790 dip->meta.mtime = mtime;
1791 hammer2_inode_unlock(dip);
1794 hammer2_trans_done(dip->pmp);
1797 * Finalize namecache
1800 cache_setunresolved(ap->a_nch);
1801 cache_setvp(ap->a_nch, *ap->a_vpp);
1802 hammer2_knote(ap->a_dvp, NOTE_WRITE);
1808 * hammer2_vop_nremove { nch, dvp, cred }
1812 hammer2_vop_nremove(struct vop_nremove_args *ap)
1814 hammer2_xop_unlink_t *xop;
1815 hammer2_inode_t *dip;
1816 hammer2_inode_t *ip;
1817 struct namecache *ncp;
1821 dip = VTOI(ap->a_dvp);
1822 if (dip->pmp->ronly)
1825 /* allow removals, except user to also bulkfree */
1826 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1)
1830 ncp = ap->a_nch->ncp;
1832 hammer2_pfs_memory_wait(dip->pmp);
1833 hammer2_trans_init(dip->pmp, 0);
1834 hammer2_inode_lock(dip, 0);
1837 * The unlink XOP unlinks the path from the directory and
1838 * locates and returns the cluster associated with the real inode.
1839 * We have to handle nlinks here on the frontend.
1841 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING);
1842 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1845 * The namecache entry is locked so nobody can use this namespace.
1846 * Calculate isopen to determine if this namespace has an open vp
1847 * associated with it and resolve the vp only if it does.
1849 * We try to avoid resolving the vnode if nobody has it open, but
1850 * note that the test is via this namespace only.
1852 isopen = cache_isopen(ap->a_nch);
1854 xop->dopermanent = 0;
1855 hammer2_xop_start(&xop->head, hammer2_xop_unlink);
1858 * Collect the real inode and adjust nlinks, destroy the real
1859 * inode if nlinks transitions to 0 and it was the real inode
1860 * (else it has already been removed).
1862 error = hammer2_xop_collect(&xop->head, 0);
1863 error = hammer2_error_to_errno(error);
1864 hammer2_inode_unlock(dip);
1867 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1868 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1870 hammer2_inode_unlink_finisher(ip, isopen);
1871 hammer2_inode_unlock(ip);
1874 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1878 * Update dip's mtime
1883 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1884 hammer2_update_time(&mtime);
1885 hammer2_inode_modify(dip);
1886 dip->meta.mtime = mtime;
1887 hammer2_inode_unlock(dip);
1890 hammer2_inode_run_sideq(dip->pmp, 0);
1891 hammer2_trans_done(dip->pmp);
1893 cache_unlink(ap->a_nch);
1894 hammer2_knote(ap->a_dvp, NOTE_WRITE);
1900 * hammer2_vop_nrmdir { nch, dvp, cred }
1904 hammer2_vop_nrmdir(struct vop_nrmdir_args *ap)
1906 hammer2_xop_unlink_t *xop;
1907 hammer2_inode_t *dip;
1908 hammer2_inode_t *ip;
1909 struct namecache *ncp;
1913 dip = VTOI(ap->a_dvp);
1914 if (dip->pmp->ronly)
1917 /* allow removals, except user to also bulkfree */
1918 if (hammer2_vfs_enospace(dip, 0, ap->a_cred) > 1)
1922 hammer2_pfs_memory_wait(dip->pmp);
1923 hammer2_trans_init(dip->pmp, 0);
1924 hammer2_inode_lock(dip, 0);
1926 xop = hammer2_xop_alloc(dip, HAMMER2_XOP_MODIFYING);
1928 ncp = ap->a_nch->ncp;
1929 hammer2_xop_setname(&xop->head, ncp->nc_name, ncp->nc_nlen);
1930 isopen = cache_isopen(ap->a_nch);
1932 xop->dopermanent = 0;
1933 hammer2_xop_start(&xop->head, hammer2_xop_unlink);
1936 * Collect the real inode and adjust nlinks, destroy the real
1937 * inode if nlinks transitions to 0 and it was the real inode
1938 * (else it has already been removed).
1940 error = hammer2_xop_collect(&xop->head, 0);
1941 error = hammer2_error_to_errno(error);
1942 hammer2_inode_unlock(dip);
1945 ip = hammer2_inode_get(dip->pmp, dip, &xop->head.cluster, -1);
1946 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1948 hammer2_inode_unlink_finisher(ip, isopen);
1949 hammer2_inode_unlock(ip);
1952 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1956 * Update dip's mtime
1961 hammer2_inode_lock(dip, HAMMER2_RESOLVE_SHARED);
1962 hammer2_update_time(&mtime);
1963 hammer2_inode_modify(dip);
1964 dip->meta.mtime = mtime;
1965 hammer2_inode_unlock(dip);
1968 hammer2_inode_run_sideq(dip->pmp, 0);
1969 hammer2_trans_done(dip->pmp);
1971 cache_unlink(ap->a_nch);
1972 hammer2_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK);
1978 * hammer2_vop_nrename { fnch, tnch, fdvp, tdvp, cred }
1982 hammer2_vop_nrename(struct vop_nrename_args *ap)
1984 struct namecache *fncp;
1985 struct namecache *tncp;
1986 hammer2_inode_t *fdip; /* source directory */
1987 hammer2_inode_t *tdip; /* target directory */
1988 hammer2_inode_t *ip; /* file being renamed */
1989 hammer2_inode_t *tip; /* replaced target during rename or NULL */
1990 const uint8_t *fname;
1992 const uint8_t *tname;
1999 if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount)
2001 if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount)
2004 fdip = VTOI(ap->a_fdvp); /* source directory */
2005 tdip = VTOI(ap->a_tdvp); /* target directory */
2007 if (fdip->pmp->ronly)
2009 if (hammer2_vfs_enospace(fdip, 0, ap->a_cred) > 1)
2012 fncp = ap->a_fnch->ncp; /* entry name in source */
2013 fname = fncp->nc_name;
2014 fname_len = fncp->nc_nlen;
2016 tncp = ap->a_tnch->ncp; /* entry name in target */
2017 tname = tncp->nc_name;
2018 tname_len = tncp->nc_nlen;
2020 hammer2_pfs_memory_wait(tdip->pmp);
2021 hammer2_trans_init(tdip->pmp, 0);
2026 ip = VTOI(fncp->nc_vp);
2027 hammer2_inode_ref(ip); /* extra ref */
2030 * Lookup the target name to determine if a directory entry
2031 * is being overwritten. We only hold related inode locks
2032 * temporarily, the operating system is expected to protect
2033 * against rename races.
2035 tip = tncp->nc_vp ? VTOI(tncp->nc_vp) : NULL;
2037 hammer2_inode_ref(tip); /* extra ref */
2040 * Can return NULL and error == EXDEV if the common parent
2041 * crosses a directory with the xlink flag set.
2043 * For now try to avoid deadlocks with a simple pointer address
2044 * test. (tip) can be NULL.
2048 hammer2_inode_lock(fdip, 0);
2049 hammer2_inode_lock(tdip, 0);
2051 hammer2_inode_lock(tdip, 0);
2052 hammer2_inode_lock(fdip, 0);
2056 hammer2_inode_lock(ip, 0);
2057 hammer2_inode_lock(tip, 0);
2059 hammer2_inode_lock(tip, 0);
2060 hammer2_inode_lock(ip, 0);
2063 hammer2_inode_lock(ip, 0);
2068 * Delete the target namespace.
2070 * REMOVED - NOW FOLDED INTO XOP_NRENAME OPERATION
2073 hammer2_xop_unlink_t *xop2;
2074 hammer2_inode_t *tip;
2078 * The unlink XOP unlinks the path from the directory and
2079 * locates and returns the cluster associated with the real
2080 * inode. We have to handle nlinks here on the frontend.
2082 xop2 = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING);
2083 hammer2_xop_setname(&xop2->head, tname, tname_len);
2084 isopen = cache_isopen(ap->a_tnch);
2086 xop2->dopermanent = 0;
2087 hammer2_xop_start(&xop2->head, hammer2_xop_unlink);
2090 * Collect the real inode and adjust nlinks, destroy the real
2091 * inode if nlinks transitions to 0 and it was the real inode
2092 * (else it has already been removed).
2094 tnch_error = hammer2_xop_collect(&xop2->head, 0);
2095 tnch_error = hammer2_error_to_errno(tnch_error);
2096 /* hammer2_inode_unlock(tdip); */
2098 if (tnch_error == 0) {
2099 tip = hammer2_inode_get(tdip->pmp, NULL,
2100 &xop2->head.cluster, -1);
2101 hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP);
2103 hammer2_inode_unlink_finisher(tip, isopen);
2104 hammer2_inode_unlock(tip);
2107 hammer2_xop_retire(&xop2->head, HAMMER2_XOPMASK_VOP);
2109 /* hammer2_inode_lock(tdip, 0); */
2111 if (tnch_error && tnch_error != ENOENT) {
2120 * Resolve the collision space for (tdip, tname, tname_len)
2122 * tdip must be held exclusively locked to prevent races since
2123 * multiple filenames can end up in the same collision space.
2126 hammer2_xop_scanlhc_t *sxop;
2127 hammer2_tid_t lhcbase;
2129 tlhc = hammer2_dirhash(tname, tname_len);
2131 sxop = hammer2_xop_alloc(tdip, HAMMER2_XOP_MODIFYING);
2133 hammer2_xop_start(&sxop->head, hammer2_xop_scanlhc);
2134 while ((error = hammer2_xop_collect(&sxop->head, 0)) == 0) {
2135 if (tlhc != sxop->head.cluster.focus->bref.key)
2139 error = hammer2_error_to_errno(error);
2140 hammer2_xop_retire(&sxop->head, HAMMER2_XOPMASK_VOP);
2143 if (error != ENOENT)
2148 if ((lhcbase ^ tlhc) & ~HAMMER2_DIRHASH_LOMASK) {
2155 * Ready to go, issue the rename to the backend. Note that meta-data
2156 * updates to the related inodes occur separately from the rename
2159 * NOTE: While it is not necessary to update ip->meta.name*, doing
2160 * so aids catastrophic recovery and debugging.
2163 hammer2_xop_nrename_t *xop4;
2165 xop4 = hammer2_xop_alloc(fdip, HAMMER2_XOP_MODIFYING);
2167 xop4->ip_key = ip->meta.name_key;
2168 hammer2_xop_setip2(&xop4->head, ip);
2169 hammer2_xop_setip3(&xop4->head, tdip);
2170 hammer2_xop_setname(&xop4->head, fname, fname_len);
2171 hammer2_xop_setname2(&xop4->head, tname, tname_len);
2172 hammer2_xop_start(&xop4->head, hammer2_xop_nrename);
2174 error = hammer2_xop_collect(&xop4->head, 0);
2175 error = hammer2_error_to_errno(error);
2176 hammer2_xop_retire(&xop4->head, HAMMER2_XOPMASK_VOP);
2178 if (error == ENOENT)
2182 * Update inode meta-data.
2184 * WARNING! The in-memory inode (ip) structure does not
2185 * maintain a copy of the inode's filename buffer.
2188 (ip->meta.name_key & HAMMER2_DIRHASH_VISIBLE)) {
2189 hammer2_inode_modify(ip);
2190 ip->meta.name_len = tname_len;
2191 ip->meta.name_key = tlhc;
2194 hammer2_inode_modify(ip);
2195 ip->meta.iparent = tdip->meta.inum;
2203 * If no error, the backend has replaced the target directory entry.
2204 * We must adjust nlinks on the original replace target if it exists.
2206 if (error == 0 && tip) {
2209 isopen = cache_isopen(ap->a_tnch);
2210 hammer2_inode_unlink_finisher(tip, isopen);
2214 * Update directory mtimes to represent the something changed.
2216 if (update_fdip || update_tdip) {
2219 hammer2_update_time(&mtime);
2221 hammer2_inode_modify(fdip);
2222 fdip->meta.mtime = mtime;
2225 hammer2_inode_modify(tdip);
2226 tdip->meta.mtime = mtime;
2230 hammer2_inode_unlock(tip);
2231 hammer2_inode_drop(tip);
2233 hammer2_inode_unlock(ip);
2234 hammer2_inode_unlock(tdip);
2235 hammer2_inode_unlock(fdip);
2236 hammer2_inode_drop(ip);
2237 hammer2_inode_run_sideq(fdip->pmp, 0);
2239 hammer2_trans_done(tdip->pmp);
2242 * Issue the namecache update after unlocking all the internal
2243 * hammer2 structures, otherwise we might deadlock.
2245 * WARNING! The target namespace must be updated atomically,
2246 * and we depend on cache_rename() to handle that for
2247 * us. Do not do a separate cache_unlink() because
2248 * that leaves a small window of opportunity for other
2249 * threads to allocate the target namespace before we
2250 * manage to complete our rename.
2252 * WARNING! cache_rename() (and cache_unlink()) will properly
2253 * set VREF_FINALIZE on any attached vnode. Do not
2254 * call cache_setunresolved() manually before-hand as
2255 * this will prevent the flag from being set later via
2256 * cache_rename(). If VREF_FINALIZE is not properly set
2257 * and the inode is no longer in the topology, related
2258 * chains can remain dirty indefinitely.
2260 if (error == 0 && tip) {
2261 /*cache_unlink(ap->a_tnch); see above */
2262 /*cache_setunresolved(ap->a_tnch); see above */
2265 cache_rename(ap->a_fnch, ap->a_tnch);
2266 hammer2_knote(ap->a_fdvp, NOTE_WRITE);
2267 hammer2_knote(ap->a_tdvp, NOTE_WRITE);
2268 hammer2_knote(fncp->nc_vp, NOTE_RENAME);
2275 * hammer2_vop_ioctl { vp, command, data, fflag, cred }
2279 hammer2_vop_ioctl(struct vop_ioctl_args *ap)
2281 hammer2_inode_t *ip;
2284 ip = VTOI(ap->a_vp);
2286 error = hammer2_ioctl(ip, ap->a_command, (void *)ap->a_data,
2287 ap->a_fflag, ap->a_cred);
2293 hammer2_vop_mountctl(struct vop_mountctl_args *ap)
2300 case (MOUNTCTL_SET_EXPORT):
2301 mp = ap->a_head.a_ops->head.vv_mount;
2304 if (ap->a_ctllen != sizeof(struct export_args))
2307 rc = vfs_export(mp, &pmp->export,
2308 (const struct export_args *)ap->a_ctl);
2311 rc = vop_stdmountctl(ap);
2320 static void filt_hammer2detach(struct knote *kn);
2321 static int filt_hammer2read(struct knote *kn, long hint);
2322 static int filt_hammer2write(struct knote *kn, long hint);
2323 static int filt_hammer2vnode(struct knote *kn, long hint);
2325 static struct filterops hammer2read_filtops =
2326 { FILTEROP_ISFD | FILTEROP_MPSAFE,
2327 NULL, filt_hammer2detach, filt_hammer2read };
2328 static struct filterops hammer2write_filtops =
2329 { FILTEROP_ISFD | FILTEROP_MPSAFE,
2330 NULL, filt_hammer2detach, filt_hammer2write };
2331 static struct filterops hammer2vnode_filtops =
2332 { FILTEROP_ISFD | FILTEROP_MPSAFE,
2333 NULL, filt_hammer2detach, filt_hammer2vnode };
2337 hammer2_vop_kqfilter(struct vop_kqfilter_args *ap)
2339 struct vnode *vp = ap->a_vp;
2340 struct knote *kn = ap->a_kn;
2342 switch (kn->kn_filter) {
2344 kn->kn_fop = &hammer2read_filtops;
2347 kn->kn_fop = &hammer2write_filtops;
2350 kn->kn_fop = &hammer2vnode_filtops;
2353 return (EOPNOTSUPP);
2356 kn->kn_hook = (caddr_t)vp;
2358 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
2364 filt_hammer2detach(struct knote *kn)
2366 struct vnode *vp = (void *)kn->kn_hook;
2368 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
2372 filt_hammer2read(struct knote *kn, long hint)
2374 struct vnode *vp = (void *)kn->kn_hook;
2375 hammer2_inode_t *ip = VTOI(vp);
2378 if (hint == NOTE_REVOKE) {
2379 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
2382 off = ip->meta.size - kn->kn_fp->f_offset;
2383 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
2384 if (kn->kn_sfflags & NOTE_OLDAPI)
2386 return (kn->kn_data != 0);
2391 filt_hammer2write(struct knote *kn, long hint)
2393 if (hint == NOTE_REVOKE)
2394 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
2400 filt_hammer2vnode(struct knote *kn, long hint)
2402 if (kn->kn_sfflags & hint)
2403 kn->kn_fflags |= hint;
2404 if (hint == NOTE_REVOKE) {
2405 kn->kn_flags |= (EV_EOF | EV_NODATA);
2408 return (kn->kn_fflags != 0);
2416 hammer2_vop_markatime(struct vop_markatime_args *ap)
2418 hammer2_inode_t *ip;
2431 hammer2_vop_fifokqfilter(struct vop_kqfilter_args *ap)
2435 error = VOCALL(&fifo_vnode_vops, &ap->a_head);
2437 error = hammer2_vop_kqfilter(ap);
2444 struct vop_ops hammer2_vnode_vops = {
2445 .vop_default = vop_defaultop,
2446 .vop_fsync = hammer2_vop_fsync,
2447 .vop_getpages = vop_stdgetpages,
2448 .vop_putpages = vop_stdputpages,
2449 .vop_access = hammer2_vop_access,
2450 .vop_advlock = hammer2_vop_advlock,
2451 .vop_close = hammer2_vop_close,
2452 .vop_nlink = hammer2_vop_nlink,
2453 .vop_ncreate = hammer2_vop_ncreate,
2454 .vop_nsymlink = hammer2_vop_nsymlink,
2455 .vop_nremove = hammer2_vop_nremove,
2456 .vop_nrmdir = hammer2_vop_nrmdir,
2457 .vop_nrename = hammer2_vop_nrename,
2458 .vop_getattr = hammer2_vop_getattr,
2459 .vop_setattr = hammer2_vop_setattr,
2460 .vop_readdir = hammer2_vop_readdir,
2461 .vop_readlink = hammer2_vop_readlink,
2462 .vop_read = hammer2_vop_read,
2463 .vop_write = hammer2_vop_write,
2464 .vop_open = hammer2_vop_open,
2465 .vop_inactive = hammer2_vop_inactive,
2466 .vop_reclaim = hammer2_vop_reclaim,
2467 .vop_nresolve = hammer2_vop_nresolve,
2468 .vop_nlookupdotdot = hammer2_vop_nlookupdotdot,
2469 .vop_nmkdir = hammer2_vop_nmkdir,
2470 .vop_nmknod = hammer2_vop_nmknod,
2471 .vop_ioctl = hammer2_vop_ioctl,
2472 .vop_mountctl = hammer2_vop_mountctl,
2473 .vop_bmap = hammer2_vop_bmap,
2474 .vop_strategy = hammer2_vop_strategy,
2475 .vop_kqfilter = hammer2_vop_kqfilter
2478 struct vop_ops hammer2_spec_vops = {
2479 .vop_default = vop_defaultop,
2480 .vop_fsync = hammer2_vop_fsync,
2481 .vop_read = vop_stdnoread,
2482 .vop_write = vop_stdnowrite,
2483 .vop_access = hammer2_vop_access,
2484 .vop_close = hammer2_vop_close,
2485 .vop_markatime = hammer2_vop_markatime,
2486 .vop_getattr = hammer2_vop_getattr,
2487 .vop_inactive = hammer2_vop_inactive,
2488 .vop_reclaim = hammer2_vop_reclaim,
2489 .vop_setattr = hammer2_vop_setattr
2492 struct vop_ops hammer2_fifo_vops = {
2493 .vop_default = fifo_vnoperate,
2494 .vop_fsync = hammer2_vop_fsync,
2496 .vop_read = hammer2_vop_fiforead,
2497 .vop_write = hammer2_vop_fifowrite,
2499 .vop_access = hammer2_vop_access,
2501 .vop_close = hammer2_vop_fifoclose,
2503 .vop_markatime = hammer2_vop_markatime,
2504 .vop_getattr = hammer2_vop_getattr,
2505 .vop_inactive = hammer2_vop_inactive,
2506 .vop_reclaim = hammer2_vop_reclaim,
2507 .vop_setattr = hammer2_vop_setattr,
2508 .vop_kqfilter = hammer2_vop_fifokqfilter