2 * Copyright (c) 2011-2014 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>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/cdefs.h>
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/types.h>
46 static void hammer2_inode_move_to_hidden(hammer2_trans_t *trans,
47 hammer2_cluster_t **cparentp,
48 hammer2_cluster_t **clusterp,
51 RB_GENERATE2(hammer2_inode_tree, hammer2_inode, rbnode, hammer2_inode_cmp,
55 hammer2_inode_cmp(hammer2_inode_t *ip1, hammer2_inode_t *ip2)
57 if (ip1->inum < ip2->inum)
59 if (ip1->inum > ip2->inum)
67 * HAMMER2 offers shared locks and exclusive locks on inodes.
69 * The inode locking function locks the inode itself, resolves any stale
70 * chains in the inode's cluster, and allocates a fresh copy of the
71 * cluster with 1 ref and all the underlying chains locked. Duplication
72 * races are handled by this function.
74 * ip->cluster will be stable while the inode is locked.
76 * NOTE: We don't combine the inode/chain lock because putting away an
77 * inode would otherwise confuse multiple lock holders of the inode.
79 * NOTE: In-memory inodes always point to hardlink targets (the actual file),
80 * and never point to a hardlink pointer.
83 hammer2_inode_lock_ex(hammer2_inode_t *ip)
85 const hammer2_inode_data_t *ipdata;
86 hammer2_cluster_t *cluster;
87 hammer2_chain_t *chain;
90 hammer2_inode_ref(ip);
91 ccms_thread_lock(&ip->topo_cst, CCMS_STATE_EXCLUSIVE);
92 cluster = hammer2_cluster_copy(&ip->cluster,
93 HAMMER2_CLUSTER_COPY_NOCHAINS);
95 ip->cluster.focus = NULL;
96 cluster->focus = NULL;
98 for (i = 0; i < cluster->nchains; ++i) {
99 chain = ip->cluster.array[i];
101 kprintf("inode_lock: %p: missing chain\n", ip);
105 hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS);
106 cluster->array[i] = chain;
107 if (cluster->focus == NULL)
108 cluster->focus = chain;
109 if (ip->cluster.focus == NULL)
110 ip->cluster.focus = chain;
114 * Returned cluster must resolve hardlink pointers
116 ipdata = &hammer2_cluster_data(cluster)->ipdata;
117 KKASSERT(ipdata->type != HAMMER2_OBJTYPE_HARDLINK);
119 if (ipdata->type == HAMMER2_OBJTYPE_HARDLINK &&
120 (cluster->focus->flags & HAMMER2_CHAIN_DELETED) == 0) {
121 error = hammer2_hardlink_find(ip->pip, NULL, cluster);
122 KKASSERT(error == 0);
130 hammer2_inode_unlock_ex(hammer2_inode_t *ip, hammer2_cluster_t *cluster)
133 hammer2_cluster_unlock(cluster);
134 ccms_thread_unlock(&ip->topo_cst);
135 hammer2_inode_drop(ip);
139 * NOTE: We don't combine the inode/chain lock because putting away an
140 * inode would otherwise confuse multiple lock holders of the inode.
142 * Shared locks are especially sensitive to having too many shared
143 * lock counts (from the same thread) on certain paths which might
144 * need to upgrade them. Only one count of a shared lock can be
148 hammer2_inode_lock_sh(hammer2_inode_t *ip)
150 const hammer2_inode_data_t *ipdata;
151 hammer2_cluster_t *cluster;
152 hammer2_chain_t *chain;
155 hammer2_inode_ref(ip);
156 cluster = hammer2_cluster_copy(&ip->cluster,
157 HAMMER2_CLUSTER_COPY_NOCHAINS);
158 ccms_thread_lock(&ip->topo_cst, CCMS_STATE_SHARED);
160 cluster->focus = NULL;
162 for (i = 0; i < cluster->nchains; ++i) {
163 chain = ip->cluster.array[i];
166 kprintf("inode_lock: %p: missing chain\n", ip);
170 hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS |
171 HAMMER2_RESOLVE_SHARED);
172 cluster->array[i] = chain;
173 if (cluster->focus == NULL)
174 cluster->focus = chain;
178 * Returned cluster must resolve hardlink pointers
180 ipdata = &hammer2_cluster_data(cluster)->ipdata;
181 KKASSERT(ipdata->type != HAMMER2_OBJTYPE_HARDLINK);
183 if (ipdata->type == HAMMER2_OBJTYPE_HARDLINK &&
184 (cluster->focus->flags & HAMMER2_CHAIN_DELETED) == 0) {
185 error = hammer2_hardlink_find(ip->pip, NULL, cluster);
186 KKASSERT(error == 0);
194 hammer2_inode_unlock_sh(hammer2_inode_t *ip, hammer2_cluster_t *cluster)
197 hammer2_cluster_unlock(cluster);
198 ccms_thread_unlock(&ip->topo_cst);
199 hammer2_inode_drop(ip);
203 hammer2_inode_lock_temp_release(hammer2_inode_t *ip)
205 return(ccms_thread_lock_temp_release(&ip->topo_cst));
209 hammer2_inode_lock_temp_restore(hammer2_inode_t *ip, ccms_state_t ostate)
211 ccms_thread_lock_temp_restore(&ip->topo_cst, ostate);
215 hammer2_inode_lock_upgrade(hammer2_inode_t *ip)
217 return(ccms_thread_lock_upgrade(&ip->topo_cst));
221 hammer2_inode_lock_downgrade(hammer2_inode_t *ip, ccms_state_t ostate)
223 ccms_thread_lock_downgrade(&ip->topo_cst, ostate);
227 * Lookup an inode by inode number
230 hammer2_inode_lookup(hammer2_pfsmount_t *pmp, hammer2_tid_t inum)
238 spin_lock(&pmp->inum_spin);
239 ip = RB_LOOKUP(hammer2_inode_tree, &pmp->inum_tree, inum);
241 hammer2_inode_ref(ip);
242 spin_unlock(&pmp->inum_spin);
248 * Adding a ref to an inode is only legal if the inode already has at least
251 * (can be called with spinlock held)
254 hammer2_inode_ref(hammer2_inode_t *ip)
256 atomic_add_int(&ip->refs, 1);
260 * Drop an inode reference, freeing the inode when the last reference goes
264 hammer2_inode_drop(hammer2_inode_t *ip)
266 hammer2_pfsmount_t *pmp;
267 hammer2_inode_t *pip;
275 * Transition to zero, must interlock with
276 * the inode inumber lookup tree (if applicable).
280 spin_lock(&pmp->inum_spin);
282 if (atomic_cmpset_int(&ip->refs, 1, 0)) {
283 KKASSERT(ip->topo_cst.count == 0);
284 if (ip->flags & HAMMER2_INODE_ONRBTREE) {
285 atomic_clear_int(&ip->flags,
286 HAMMER2_INODE_ONRBTREE);
287 RB_REMOVE(hammer2_inode_tree,
288 &pmp->inum_tree, ip);
290 spin_unlock(&pmp->inum_spin);
297 * Cleaning out ip->cluster isn't entirely
300 hammer2_inode_repoint(ip, NULL, NULL);
303 * We have to drop pip (if non-NULL) to
304 * dispose of our implied reference from
305 * ip->pip. We can simply loop on it.
307 kfree(ip, pmp->minode);
308 atomic_add_long(&pmp->inmem_inodes, -1);
310 /* continue with pip (can be NULL) */
312 spin_unlock(&ip->pmp->inum_spin);
316 * Non zero transition
318 if (atomic_cmpset_int(&ip->refs, refs, refs - 1))
325 * Get the vnode associated with the given inode, allocating the vnode if
326 * necessary. The vnode will be returned exclusively locked.
328 * The caller must lock the inode (shared or exclusive).
330 * Great care must be taken to avoid deadlocks and vnode acquisition/reclaim
334 hammer2_igetv(hammer2_inode_t *ip, hammer2_cluster_t *cparent, int *errorp)
336 const hammer2_inode_data_t *ipdata;
337 hammer2_pfsmount_t *pmp;
342 KKASSERT(pmp != NULL);
345 ipdata = &hammer2_cluster_data(cparent)->ipdata;
349 * Attempt to reuse an existing vnode assignment. It is
350 * possible to race a reclaim so the vget() may fail. The
351 * inode must be unlocked during the vget() to avoid a
352 * deadlock against a reclaim.
357 * Inode must be unlocked during the vget() to avoid
358 * possible deadlocks, but leave the ip ref intact.
360 * vnode is held to prevent destruction during the
361 * vget(). The vget() can still fail if we lost
362 * a reclaim race on the vnode.
365 ostate = hammer2_inode_lock_temp_release(ip);
366 if (vget(vp, LK_EXCLUSIVE)) {
368 hammer2_inode_lock_temp_restore(ip, ostate);
371 hammer2_inode_lock_temp_restore(ip, ostate);
373 /* vp still locked and ref from vget */
375 kprintf("hammer2: igetv race %p/%p\n",
385 * No vnode exists, allocate a new vnode. Beware of
386 * allocation races. This function will return an
387 * exclusively locked and referenced vnode.
389 *errorp = getnewvnode(VT_HAMMER2, pmp->mp, &vp, 0, 0);
391 kprintf("hammer2: igetv getnewvnode failed %d\n",
398 * Lock the inode and check for an allocation race.
400 ostate = hammer2_inode_lock_upgrade(ip);
401 if (ip->vp != NULL) {
404 hammer2_inode_lock_downgrade(ip, ostate);
408 switch (ipdata->type) {
409 case HAMMER2_OBJTYPE_DIRECTORY:
412 case HAMMER2_OBJTYPE_REGFILE:
414 vinitvmio(vp, ipdata->size,
416 (int)ipdata->size & HAMMER2_LBUFMASK);
418 case HAMMER2_OBJTYPE_SOFTLINK:
420 * XXX for now we are using the generic file_read
421 * and file_write code so we need a buffer cache
425 vinitvmio(vp, ipdata->size,
427 (int)ipdata->size & HAMMER2_LBUFMASK);
429 case HAMMER2_OBJTYPE_CDEV:
432 case HAMMER2_OBJTYPE_BDEV:
433 vp->v_ops = &pmp->mp->mnt_vn_spec_ops;
434 if (ipdata->type != HAMMER2_OBJTYPE_CDEV)
436 addaliasu(vp, ipdata->rmajor, ipdata->rminor);
438 case HAMMER2_OBJTYPE_FIFO:
440 vp->v_ops = &pmp->mp->mnt_vn_fifo_ops;
443 panic("hammer2: unhandled objtype %d", ipdata->type);
447 if (ip == pmp->iroot)
448 vsetflags(vp, VROOT);
452 hammer2_inode_ref(ip); /* vp association */
453 hammer2_inode_lock_downgrade(ip, ostate);
458 * Return non-NULL vp and *errorp == 0, or NULL vp and *errorp != 0.
460 if (hammer2_debug & 0x0002) {
461 kprintf("igetv vp %p refs 0x%08x aux 0x%08x\n",
462 vp, vp->v_refcnt, vp->v_auxrefs);
468 * Returns the inode associated with the passed-in cluster, creating the
469 * inode if necessary and synchronizing it to the passed-in cluster otherwise.
471 * The passed-in chain must be locked and will remain locked on return.
472 * The returned inode will be locked and the caller may dispose of both
473 * via hammer2_inode_unlock_ex(). However, if the caller needs to resolve
474 * a hardlink it must ref/unlock/relock/drop the inode.
476 * The hammer2_inode structure regulates the interface between the high level
477 * kernel VNOPS API and the filesystem backend (the chains).
480 hammer2_inode_get(hammer2_pfsmount_t *pmp, hammer2_inode_t *dip,
481 hammer2_cluster_t *cluster)
483 hammer2_inode_t *nip;
484 const hammer2_inode_data_t *iptmp;
485 const hammer2_inode_data_t *nipdata;
487 KKASSERT(hammer2_cluster_type(cluster) == HAMMER2_BREF_TYPE_INODE);
491 * Interlocked lookup/ref of the inode. This code is only needed
492 * when looking up inodes with nlinks != 0 (TODO: optimize out
493 * otherwise and test for duplicates).
497 iptmp = &hammer2_cluster_data(cluster)->ipdata;
498 nip = hammer2_inode_lookup(pmp, iptmp->inum);
502 ccms_thread_lock(&nip->topo_cst, CCMS_STATE_EXCLUSIVE);
505 * Handle SMP race (not applicable to the super-root spmp
506 * which can't index inodes due to duplicative inode numbers).
508 if (pmp->spmp_hmp == NULL &&
509 (nip->flags & HAMMER2_INODE_ONRBTREE) == 0) {
510 ccms_thread_unlock(&nip->topo_cst);
511 hammer2_inode_drop(nip);
514 hammer2_inode_repoint(nip, NULL, cluster);
519 * We couldn't find the inode number, create a new inode.
521 nip = kmalloc(sizeof(*nip), pmp->minode, M_WAITOK | M_ZERO);
522 atomic_add_long(&pmp->inmem_inodes, 1);
523 hammer2_pfs_memory_inc(pmp);
524 hammer2_pfs_memory_wakeup(pmp);
526 nip->flags = HAMMER2_INODE_SROOT;
529 * Initialize nip's cluster
531 nip->cluster.refs = 1;
532 nip->cluster.pmp = pmp;
533 nip->cluster.flags |= HAMMER2_CLUSTER_INODE;
534 hammer2_cluster_replace(&nip->cluster, cluster);
536 nipdata = &hammer2_cluster_data(cluster)->ipdata;
537 nip->inum = nipdata->inum;
538 nip->size = nipdata->size;
539 nip->mtime = nipdata->mtime;
540 hammer2_inode_repoint(nip, NULL, cluster);
541 nip->pip = dip; /* can be NULL */
543 hammer2_inode_ref(dip); /* ref dip for nip->pip */
548 * ref and lock on nip gives it state compatible to after a
549 * hammer2_inode_lock_ex() call.
552 ccms_cst_init(&nip->topo_cst, &nip->cluster);
553 ccms_thread_lock(&nip->topo_cst, CCMS_STATE_EXCLUSIVE);
554 /* combination of thread lock and chain lock == inode lock */
557 * Attempt to add the inode. If it fails we raced another inode
558 * get. Undo all the work and try again.
560 if (pmp->spmp_hmp == NULL) {
561 spin_lock(&pmp->inum_spin);
562 if (RB_INSERT(hammer2_inode_tree, &pmp->inum_tree, nip)) {
563 spin_unlock(&pmp->inum_spin);
564 ccms_thread_unlock(&nip->topo_cst);
565 hammer2_inode_drop(nip);
568 atomic_set_int(&nip->flags, HAMMER2_INODE_ONRBTREE);
569 spin_unlock(&pmp->inum_spin);
576 * Create a new inode in the specified directory using the vattr to
577 * figure out the type of inode.
579 * If no error occurs the new inode with its cluster locked is returned in
580 * *nipp, otherwise an error is returned and *nipp is set to NULL.
582 * If vap and/or cred are NULL the related fields are not set and the
583 * inode type defaults to a directory. This is used when creating PFSs
584 * under the super-root, so the inode number is set to 1 in this case.
586 * dip is not locked on entry.
588 * NOTE: When used to create a snapshot, the inode is temporarily associated
589 * with the super-root spmp. XXX should pass new pmp for snapshot.
592 hammer2_inode_create(hammer2_trans_t *trans, hammer2_inode_t *dip,
593 struct vattr *vap, struct ucred *cred,
594 const uint8_t *name, size_t name_len,
595 hammer2_cluster_t **clusterp, int *errorp)
597 const hammer2_inode_data_t *dipdata;
598 hammer2_inode_data_t *nipdata;
599 hammer2_cluster_t *cluster;
600 hammer2_cluster_t *cparent;
601 hammer2_inode_t *nip;
602 hammer2_key_t key_dummy;
609 uint8_t dip_comp_algo;
610 uint8_t dip_check_algo;
613 lhc = hammer2_dirhash(name, name_len);
617 * Locate the inode or indirect block to create the new
618 * entry in. At the same time check for key collisions
619 * and iterate until we don't get one.
621 * NOTE: hidden inodes do not have iterators.
624 cparent = hammer2_inode_lock_ex(dip);
625 dipdata = &hammer2_cluster_data(cparent)->ipdata;
626 dip_uid = dipdata->uid;
627 dip_gid = dipdata->gid;
628 dip_mode = dipdata->mode;
629 dip_comp_algo = dipdata->comp_algo;
630 dip_check_algo = dipdata->check_algo;
634 cluster = hammer2_cluster_lookup(cparent, &key_dummy,
635 lhc, lhc, 0, &ddflag);
638 if ((lhc & HAMMER2_DIRHASH_VISIBLE) == 0)
640 if ((lhc & HAMMER2_DIRHASH_LOMASK) == HAMMER2_DIRHASH_LOMASK)
642 hammer2_cluster_unlock(cluster);
648 error = hammer2_cluster_create(trans, cparent, &cluster,
650 HAMMER2_BREF_TYPE_INODE,
655 kprintf("CREATE INODE %*.*s chain=%p\n",
656 (int)name_len, (int)name_len, name,
657 (cluster ? cluster->focus : NULL));
661 * Cleanup and handle retries.
663 if (error == EAGAIN) {
664 hammer2_cluster_ref(cparent);
665 hammer2_inode_unlock_ex(dip, cparent);
666 hammer2_cluster_wait(cparent);
667 hammer2_cluster_drop(cparent);
670 hammer2_inode_unlock_ex(dip, cparent);
674 KKASSERT(cluster == NULL);
680 * Set up the new inode.
682 * NOTE: *_get() integrates chain's lock into the inode lock.
684 * NOTE: Only one new inode can currently be created per
685 * transaction. If the need arises we can adjust
686 * hammer2_trans_init() to allow more.
688 * NOTE: nipdata will have chain's blockset data.
690 KKASSERT(cluster->focus->flags & HAMMER2_CHAIN_MODIFIED);
691 nipdata = &hammer2_cluster_wdata(cluster)->ipdata;
692 nipdata->inum = trans->inode_tid;
693 hammer2_cluster_modsync(cluster);
694 nip = hammer2_inode_get(dip->pmp, dip, cluster);
695 nipdata = &hammer2_cluster_wdata(cluster)->ipdata;
698 KKASSERT(trans->inodes_created == 0);
699 nipdata->type = hammer2_get_obj_type(vap->va_type);
700 nipdata->inum = trans->inode_tid;
701 ++trans->inodes_created;
703 switch (nipdata->type) {
704 case HAMMER2_OBJTYPE_CDEV:
705 case HAMMER2_OBJTYPE_BDEV:
706 nipdata->rmajor = vap->va_rmajor;
707 nipdata->rminor = vap->va_rminor;
713 nipdata->type = HAMMER2_OBJTYPE_DIRECTORY;
717 /* Inherit parent's inode compression mode. */
718 nip->comp_heuristic = 0;
719 nipdata->comp_algo = dip_comp_algo;
720 nipdata->check_algo = dip_check_algo;
721 nipdata->version = HAMMER2_INODE_VERSION_ONE;
722 hammer2_update_time(&nipdata->ctime);
723 nipdata->mtime = nipdata->ctime;
725 nipdata->mode = vap->va_mode;
728 if (dip && dip->pmp) {
729 xuid = hammer2_to_unix_xid(&dip_uid);
730 xuid = vop_helper_create_uid(dip->pmp->mp,
736 /* super-root has no dip and/or pmp */
739 if (vap->va_vaflags & VA_UID_UUID_VALID)
740 nipdata->uid = vap->va_uid_uuid;
741 else if (vap->va_uid != (uid_t)VNOVAL)
742 hammer2_guid_to_uuid(&nipdata->uid, vap->va_uid);
744 hammer2_guid_to_uuid(&nipdata->uid, xuid);
746 if (vap->va_vaflags & VA_GID_UUID_VALID)
747 nipdata->gid = vap->va_gid_uuid;
748 else if (vap->va_gid != (gid_t)VNOVAL)
749 hammer2_guid_to_uuid(&nipdata->gid, vap->va_gid);
751 nipdata->gid = dip_gid;
755 * Regular files and softlinks allow a small amount of data to be
756 * directly embedded in the inode. This flag will be cleared if
757 * the size is extended past the embedded limit.
759 if (nipdata->type == HAMMER2_OBJTYPE_REGFILE ||
760 nipdata->type == HAMMER2_OBJTYPE_SOFTLINK) {
761 nipdata->op_flags |= HAMMER2_OPFLAG_DIRECTDATA;
764 KKASSERT(name_len < HAMMER2_INODE_MAXNAME);
765 bcopy(name, nipdata->filename, name_len);
766 nipdata->name_key = lhc;
767 nipdata->name_len = name_len;
768 hammer2_cluster_modsync(cluster);
775 * The cluster has been removed from the original directory and replaced
776 * with a hardlink pointer. Move the cluster to the specified parent
777 * directory, change the filename to "0xINODENUMBER", and adjust the key.
778 * The cluster becomes our invisible hardlink target.
780 * The original cluster must be deleted on entry.
784 hammer2_hardlink_shiftup(hammer2_trans_t *trans, hammer2_cluster_t *cluster,
785 hammer2_inode_t *dip, hammer2_cluster_t *dcluster,
786 int nlinks, int *errorp)
788 const hammer2_inode_data_t *iptmp;
789 hammer2_inode_data_t *nipdata;
790 hammer2_cluster_t *xcluster;
791 hammer2_key_t key_dummy;
793 hammer2_blockref_t bref;
796 iptmp = &hammer2_cluster_data(cluster)->ipdata;
798 KKASSERT((lhc & HAMMER2_DIRHASH_VISIBLE) == 0);
801 * Locate the inode or indirect block to create the new
802 * entry in. lhc represents the inode number so there is
803 * no collision iteration.
805 * There should be no key collisions with invisible inode keys.
807 * WARNING! Must use inode_lock_ex() on dip to handle a stale
808 * dip->cluster cache.
811 xcluster = hammer2_cluster_lookup(dcluster, &key_dummy,
812 lhc, lhc, 0, &ddflag);
814 kprintf("X3 chain %p dip %p dchain %p dip->chain %p\n",
815 xcluster->focus, dip, dcluster->focus,
817 hammer2_cluster_unlock(xcluster);
826 * Handle the error case
830 KKASSERT(xcluster == NULL);
835 * Use xcluster as a placeholder for (lhc). Duplicate cluster to the
836 * same target bref as xcluster and then delete xcluster. The
837 * duplication occurs after xcluster in flush order even though
838 * xcluster is deleted after the duplication. XXX
840 * WARNING! Duplications (to a different parent) can cause indirect
841 * blocks to be inserted, refactor xcluster.
843 * WARNING! Only key and keybits is extracted from a passed-in bref.
845 hammer2_cluster_bref(cluster, &bref);
846 bref.key = lhc; /* invisible dir entry key */
848 hammer2_cluster_rename(trans, &bref, dcluster, cluster, 0);
851 * cluster is now 'live' again.. adjust the filename.
853 * Directory entries are inodes but this is a hidden hardlink
854 * target. The name isn't used but to ease debugging give it
855 * a name after its inode number.
857 hammer2_cluster_modify(trans, cluster, 0);
858 nipdata = &hammer2_cluster_wdata(cluster)->ipdata;
859 ksnprintf(nipdata->filename, sizeof(nipdata->filename),
860 "0x%016jx", (intmax_t)nipdata->inum);
861 nipdata->name_len = strlen(nipdata->filename);
862 nipdata->name_key = lhc;
863 nipdata->nlinks += nlinks;
864 hammer2_cluster_modsync(cluster);
868 * Connect the target inode represented by (cluster) to the media topology
869 * at (dip, name, len). The caller can pass a rough *chainp, this function
870 * will issue lookup()s to position the parent chain properly for the
873 * If hlink is TRUE this function creates an OBJTYPE_HARDLINK directory
874 * entry instead of connecting (cluster).
876 * If hlink is FALSE this function expects (cluster) to be unparented.
879 hammer2_inode_connect(hammer2_trans_t *trans,
880 hammer2_cluster_t **clusterp, int hlink,
881 hammer2_inode_t *dip, hammer2_cluster_t *dcluster,
882 const uint8_t *name, size_t name_len,
885 hammer2_inode_data_t *wipdata;
886 hammer2_cluster_t *ocluster;
887 hammer2_cluster_t *ncluster;
888 hammer2_key_t key_dummy;
893 * Since ocluster is either disconnected from the topology or
894 * represents a hardlink terminus which is always a parent of or
895 * equal to dip, we should be able to safely lock dip->chain for
898 * WARNING! Must use inode_lock_ex() on dip to handle a stale
901 * If name is non-NULL we calculate lhc, else we use the passed-in
904 ocluster = *clusterp;
907 lhc = hammer2_dirhash(name, name_len);
910 * Locate the inode or indirect block to create the new
911 * entry in. At the same time check for key collisions
912 * and iterate until we don't get one.
916 ncluster = hammer2_cluster_lookup(dcluster, &key_dummy,
919 if (ncluster == NULL)
921 if ((lhc & HAMMER2_DIRHASH_LOMASK) ==
922 HAMMER2_DIRHASH_LOMASK) {
925 hammer2_cluster_unlock(ncluster);
931 * Reconnect to specific key (used when moving
932 * unlinked-but-open files into the hidden directory).
934 ncluster = hammer2_cluster_lookup(dcluster, &key_dummy,
937 KKASSERT(ncluster == NULL);
943 * Hardlink pointer needed, create totally fresh
946 * We must refactor ocluster because it might have
947 * been shifted into an indirect cluster by the
950 KKASSERT(ncluster == NULL);
951 error = hammer2_cluster_create(trans,
954 HAMMER2_BREF_TYPE_INODE,
959 * Reconnect the original cluster under the new name.
960 * Original cluster must have already been deleted by
963 * WARNING! Can cause held-over clusters to require a
964 * refactor. Fortunately we have none (our
965 * locked clusters are passed into and
966 * modified by the call).
970 error = hammer2_cluster_create(trans,
973 HAMMER2_BREF_TYPE_INODE,
982 KKASSERT(error != EAGAIN);
985 * ncluster should be NULL on error, leave ocluster
986 * (ocluster == *clusterp) alone.
989 KKASSERT(ncluster == NULL);
994 * Directory entries are inodes so if the name has changed we have
995 * to update the inode.
997 * When creating an OBJTYPE_HARDLINK entry remember to unlock the
998 * cluster, the caller will access the hardlink via the actual hardlink
999 * target file and not the hardlink pointer entry, so we must still
1002 if (hlink && hammer2_hardlink_enable >= 0) {
1004 * Create the HARDLINK pointer. oip represents the hardlink
1005 * target in this situation.
1007 * We will return ocluster (the hardlink target).
1009 hammer2_cluster_modify(trans, ncluster, 0);
1010 KKASSERT(name_len < HAMMER2_INODE_MAXNAME);
1011 wipdata = &hammer2_cluster_wdata(ncluster)->ipdata;
1012 bcopy(name, wipdata->filename, name_len);
1013 wipdata->name_key = lhc;
1014 wipdata->name_len = name_len;
1015 wipdata->target_type =
1016 hammer2_cluster_data(ocluster)->ipdata.type;
1017 wipdata->type = HAMMER2_OBJTYPE_HARDLINK;
1018 wipdata->inum = hammer2_cluster_data(ocluster)->ipdata.inum;
1019 wipdata->version = HAMMER2_INODE_VERSION_ONE;
1020 wipdata->nlinks = 1;
1021 wipdata->op_flags = HAMMER2_OPFLAG_DIRECTDATA;
1022 hammer2_cluster_modsync(ncluster);
1023 hammer2_cluster_unlock(ncluster);
1024 ncluster = ocluster;
1028 * ncluster is a duplicate of ocluster at the new location.
1029 * We must fixup the name stored in the inode data.
1030 * The bref key has already been adjusted by inode_connect().
1032 hammer2_cluster_modify(trans, ncluster, 0);
1033 wipdata = &hammer2_cluster_wdata(ncluster)->ipdata;
1035 KKASSERT(name_len < HAMMER2_INODE_MAXNAME);
1036 bcopy(name, wipdata->filename, name_len);
1037 wipdata->name_key = lhc;
1038 wipdata->name_len = name_len;
1039 wipdata->nlinks = 1;
1040 hammer2_cluster_modsync(ncluster);
1044 * We are replacing ocluster with ncluster, unlock ocluster. In the
1045 * case where ocluster is left unchanged the code above sets
1046 * ncluster to ocluster and ocluster to NULL, resulting in a NOP here.
1049 hammer2_cluster_unlock(ocluster);
1050 *clusterp = ncluster;
1056 * Repoint ip->cluster's chains to cluster's chains. Caller must hold
1057 * the inode exclusively locked. cluster may be NULL to clean out any
1058 * chains in ip->cluster.
1061 hammer2_inode_repoint(hammer2_inode_t *ip, hammer2_inode_t *pip,
1062 hammer2_cluster_t *cluster)
1064 hammer2_chain_t *ochain;
1065 hammer2_chain_t *nchain;
1066 hammer2_inode_t *opip;
1070 * Replace chains in ip->cluster with chains from cluster and
1071 * adjust the focus if necessary.
1073 * NOTE: nchain and/or ochain can be NULL due to gaps
1074 * in the cluster arrays.
1076 ip->cluster.focus = NULL;
1077 for (i = 0; cluster && i < cluster->nchains; ++i) {
1078 nchain = cluster->array[i];
1079 if (i < ip->cluster.nchains) {
1080 ochain = ip->cluster.array[i];
1081 if (ochain == nchain) {
1082 if (ip->cluster.focus == NULL)
1083 ip->cluster.focus = nchain;
1093 ip->cluster.array[i] = nchain;
1094 if (ip->cluster.focus == NULL)
1095 ip->cluster.focus = nchain;
1097 hammer2_chain_ref(nchain);
1099 hammer2_chain_drop(ochain);
1103 * Release any left-over chains in ip->cluster.
1105 while (i < ip->cluster.nchains) {
1106 nchain = ip->cluster.array[i];
1108 ip->cluster.array[i] = NULL;
1109 hammer2_chain_drop(nchain);
1113 ip->cluster.nchains = cluster ? cluster->nchains : 0;
1116 * Repoint ip->pip if requested (non-NULL pip).
1118 if (pip && ip->pip != pip) {
1120 hammer2_inode_ref(pip);
1123 hammer2_inode_drop(opip);
1128 * Unlink the file from the specified directory inode. The directory inode
1129 * does not need to be locked.
1131 * isdir determines whether a directory/non-directory check should be made.
1132 * No check is made if isdir is set to -1.
1134 * isopen specifies whether special unlink-with-open-descriptor handling
1135 * must be performed. If set to -1 the caller is deleting a PFS and we
1136 * check whether the chain is mounted or not (chain->pmp != NULL). 1 is
1137 * implied if it is mounted.
1139 * If isopen is 1 and nlinks drops to 0 this function must move the chain
1140 * to a special hidden directory until last-close occurs on the file.
1142 * NOTE! The underlying file can still be active with open descriptors
1143 * or if the chain is being manually held (e.g. for rename).
1145 * The caller is responsible for fixing up ip->chain if e.g. a
1146 * rename occurs (see chain_duplicate()).
1148 * NOTE! The chain is not deleted if it is moved to the hidden directory,
1149 * but otherwise will be deleted.
1152 hammer2_unlink_file(hammer2_trans_t *trans, hammer2_inode_t *dip,
1153 const uint8_t *name, size_t name_len,
1154 int isdir, int *hlinkp, struct nchandle *nch,
1157 const hammer2_inode_data_t *ripdata;
1158 hammer2_inode_data_t *wipdata;
1159 hammer2_cluster_t *cparent;
1160 hammer2_cluster_t *hcluster;
1161 hammer2_cluster_t *hparent;
1162 hammer2_cluster_t *cluster;
1163 hammer2_cluster_t *dparent;
1164 hammer2_cluster_t *dcluster;
1165 hammer2_key_t key_dummy;
1166 hammer2_key_t key_next;
1177 lhc = hammer2_dirhash(name, name_len);
1181 * Search for the filename in the directory
1183 cparent = hammer2_inode_lock_ex(dip);
1184 cluster = hammer2_cluster_lookup(cparent, &key_next,
1185 lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1188 if (hammer2_cluster_type(cluster) == HAMMER2_BREF_TYPE_INODE) {
1189 ripdata = &hammer2_cluster_data(cluster)->ipdata;
1190 if (ripdata->name_len == name_len &&
1191 bcmp(ripdata->filename, name, name_len) == 0) {
1195 cluster = hammer2_cluster_next(cparent, cluster, &key_next,
1197 lhc + HAMMER2_DIRHASH_LOMASK,
1200 hammer2_inode_unlock_ex(dip, NULL); /* retain cparent */
1203 * Not found or wrong type (isdir < 0 disables the type check).
1204 * If a hardlink pointer, type checks use the hardlink target.
1206 if (cluster == NULL) {
1210 ripdata = &hammer2_cluster_data(cluster)->ipdata;
1211 type = ripdata->type;
1212 if (type == HAMMER2_OBJTYPE_HARDLINK) {
1214 type = ripdata->target_type;
1217 if (type == HAMMER2_OBJTYPE_DIRECTORY && isdir == 0) {
1221 if (type != HAMMER2_OBJTYPE_DIRECTORY && isdir >= 1) {
1227 * Hardlink must be resolved. We can't hold the parent locked
1228 * while we do this or we could deadlock. The physical file will
1229 * be located at or above the current directory.
1231 * We loop to reacquire the hardlink origination.
1233 * NOTE: hammer2_hardlink_find() will locate the hardlink target,
1234 * returning a modified hparent and hcluster.
1236 if (ripdata->type == HAMMER2_OBJTYPE_HARDLINK) {
1237 if (hcluster == NULL) {
1239 cluster = NULL; /* safety */
1240 hammer2_cluster_unlock(cparent);
1241 cparent = NULL; /* safety */
1242 ripdata = NULL; /* safety (associated w/cparent) */
1243 error = hammer2_hardlink_find(dip, &hparent, hcluster);
1246 * If we couldn't find the hardlink target then some
1247 * parent directory containing the hardlink pointer
1248 * probably got renamed to above the original target,
1249 * a case not yet handled by H2.
1252 kprintf("H2 unlink_file: hardlink target for "
1253 "\"%s\" not found\n",
1255 kprintf("(likely due to known directory "
1264 * If this is a directory the directory must be empty. However, if
1265 * isdir < 0 we are doing a rename and the directory does not have
1266 * to be empty, and if isdir > 1 we are deleting a PFS/snapshot
1267 * and the directory does not have to be empty.
1269 * NOTE: We check the full key range here which covers both visible
1270 * and invisible entries. Theoretically there should be no
1271 * invisible (hardlink target) entries if there are no visible
1274 if (type == HAMMER2_OBJTYPE_DIRECTORY && isdir == 1) {
1275 dparent = hammer2_cluster_lookup_init(cluster, 0);
1276 dcluster = hammer2_cluster_lookup(dparent, &key_dummy,
1277 0, (hammer2_key_t)-1,
1278 HAMMER2_LOOKUP_NODATA,
1281 hammer2_cluster_unlock(dcluster);
1282 hammer2_cluster_lookup_done(dparent);
1286 hammer2_cluster_lookup_done(dparent);
1292 * If this was a hardlink then (cparent, cluster) is the hardlink
1293 * pointer, which we can simply destroy outright. Discard the
1294 * clusters and replace with the hardlink target.
1297 hammer2_cluster_delete(trans, cparent, cluster,
1298 HAMMER2_DELETE_PERMANENT);
1299 hammer2_cluster_unlock(cparent);
1300 hammer2_cluster_unlock(cluster);
1308 * This leaves us with the hardlink target or non-hardlinked file
1309 * or directory in (cparent, cluster).
1311 * Delete the target when nlinks reaches 0 with special handling
1312 * if (isopen) is set.
1314 * NOTE! In DragonFly the vnops function calls cache_unlink() after
1315 * calling us here to clean out the namecache association,
1316 * (which does not represent a ref for the open-test), and to
1317 * force finalization of the vnode if/when the last ref gets
1320 * NOTE! Files are unlinked by rename and then relinked. nch will be
1321 * passed as NULL in this situation. hammer2_inode_connect()
1324 KKASSERT(cluster != NULL);
1325 hammer2_cluster_modify(trans, cluster, 0);
1326 wipdata = &hammer2_cluster_wdata(cluster)->ipdata;
1328 wipdata->nlinks += nlinks;
1329 if ((int64_t)wipdata->nlinks < 0) { /* XXX debugging */
1330 wipdata->nlinks = 0;
1332 hammer2_cluster_modsync(cluster);
1334 if (wipdata->nlinks == 0) {
1336 * Target nlinks has reached 0, file now unlinked (but may
1339 /* XXX need interlock if mounted
1340 if ((cluster->focus->flags & HAMMER2_CHAIN_PFSROOT) &&
1343 kprintf("hammer2: PFS \"%s\" cannot be deleted "
1344 "while still mounted\n",
1349 if (nch && cache_isopen(nch)) {
1350 hammer2_inode_move_to_hidden(trans, &cparent, &cluster,
1354 * This won't get everything if a vnode is still
1355 * present, but the cache_unlink() call the caller
1358 hammer2_cluster_delete(trans, cparent, cluster,
1359 HAMMER2_DELETE_PERMANENT);
1361 } else if (hlink == 0) {
1363 * In this situation a normal non-hardlinked file (which can
1364 * only have nlinks == 1) still has a non-zero nlinks, the
1365 * caller must be doing a RENAME operation and so is passing
1366 * a nlinks adjustment of 0, and only wishes to remove file
1367 * in order to be able to reconnect it under a different name.
1369 * In this situation we do a non-permanent deletion of the
1370 * chain in order to allow the file to be reconnected in
1371 * a different location.
1373 KKASSERT(nlinks == 0);
1374 hammer2_cluster_delete(trans, cparent, cluster, 0);
1379 hammer2_cluster_unlock(cparent);
1381 hammer2_cluster_unlock(cluster);
1383 hammer2_cluster_unlock(hparent);
1385 hammer2_cluster_unlock(hcluster);
1393 * This is called from the mount code to initialize pmp->ihidden
1396 hammer2_inode_install_hidden(hammer2_pfsmount_t *pmp)
1398 hammer2_trans_t trans;
1399 hammer2_cluster_t *cparent;
1400 hammer2_cluster_t *cluster;
1401 hammer2_cluster_t *scan;
1402 const hammer2_inode_data_t *ripdata;
1403 hammer2_inode_data_t *wipdata;
1404 hammer2_key_t key_dummy;
1405 hammer2_key_t key_next;
1416 * Find the hidden directory
1418 bzero(&key_dummy, sizeof(key_dummy));
1419 hammer2_trans_init(&trans, pmp, 0);
1422 * Setup for lookup, retrieve iroot's check and compression
1423 * algorithm request which was likely generated by newfs_hammer2.
1425 * The check/comp fields will probably never be used since inodes
1426 * are renamed into the hidden directory and not created relative to
1427 * the hidden directory, chain creation inherits from bref.methods,
1428 * and data chains inherit from their respective file inode *_algo
1431 cparent = hammer2_inode_lock_ex(pmp->iroot);
1432 ripdata = &hammer2_cluster_data(cparent)->ipdata;
1433 dip_check_algo = ripdata->check_algo;
1434 dip_comp_algo = ripdata->comp_algo;
1437 cluster = hammer2_cluster_lookup(cparent, &key_dummy,
1438 HAMMER2_INODE_HIDDENDIR,
1439 HAMMER2_INODE_HIDDENDIR,
1442 pmp->ihidden = hammer2_inode_get(pmp, pmp->iroot, cluster);
1443 hammer2_inode_ref(pmp->ihidden);
1446 * Remove any unlinked files which were left open as-of
1449 * Don't pass NODATA, we need the inode data so the delete
1450 * can do proper statistics updates.
1453 scan = hammer2_cluster_lookup(cluster, &key_next,
1457 if (hammer2_cluster_type(scan) ==
1458 HAMMER2_BREF_TYPE_INODE) {
1459 hammer2_cluster_delete(&trans, cluster, scan,
1460 HAMMER2_DELETE_PERMANENT);
1463 scan = hammer2_cluster_next(cluster, scan, &key_next,
1464 0, HAMMER2_TID_MAX, 0);
1467 hammer2_inode_unlock_ex(pmp->ihidden, cluster);
1468 hammer2_inode_unlock_ex(pmp->iroot, cparent);
1469 hammer2_trans_done(&trans);
1470 kprintf("hammer2: PFS loaded hidden dir, "
1471 "removed %d dead entries\n", count);
1476 * Create the hidden directory
1478 error = hammer2_cluster_create(&trans, cparent, &cluster,
1479 HAMMER2_INODE_HIDDENDIR, 0,
1480 HAMMER2_BREF_TYPE_INODE,
1481 HAMMER2_INODE_BYTES,
1483 hammer2_inode_unlock_ex(pmp->iroot, cparent);
1485 hammer2_cluster_modify(&trans, cluster, 0);
1486 wipdata = &hammer2_cluster_wdata(cluster)->ipdata;
1487 wipdata->type = HAMMER2_OBJTYPE_DIRECTORY;
1488 wipdata->inum = HAMMER2_INODE_HIDDENDIR;
1489 wipdata->nlinks = 1;
1490 wipdata->comp_algo = dip_comp_algo;
1491 wipdata->check_algo = dip_check_algo;
1492 hammer2_cluster_modsync(cluster);
1493 kprintf("hammer2: PFS root missing hidden directory, creating\n");
1495 pmp->ihidden = hammer2_inode_get(pmp, pmp->iroot, cluster);
1496 hammer2_inode_ref(pmp->ihidden);
1497 hammer2_inode_unlock_ex(pmp->ihidden, cluster);
1498 hammer2_trans_done(&trans);
1502 * If an open file is unlinked H2 needs to retain the file in the topology
1503 * to ensure that its backing store is not recovered by the bulk free scan.
1504 * This also allows us to avoid having to special-case the CHAIN_DELETED flag.
1506 * To do this the file is moved to a hidden directory in the PFS root and
1507 * renamed. The hidden directory must be created if it does not exist.
1511 hammer2_inode_move_to_hidden(hammer2_trans_t *trans,
1512 hammer2_cluster_t **cparentp,
1513 hammer2_cluster_t **clusterp,
1516 hammer2_cluster_t *dcluster;
1517 hammer2_pfsmount_t *pmp;
1520 pmp = (*clusterp)->pmp;
1521 KKASSERT(pmp != NULL);
1522 KKASSERT(pmp->ihidden != NULL);
1524 hammer2_cluster_delete(trans, *cparentp, *clusterp, 0);
1525 dcluster = hammer2_inode_lock_ex(pmp->ihidden);
1526 error = hammer2_inode_connect(trans, clusterp, 0,
1527 pmp->ihidden, dcluster,
1529 hammer2_inode_unlock_ex(pmp->ihidden, dcluster);
1530 KKASSERT(error == 0);
1534 * Given an exclusively locked inode and cluster we consolidate the cluster
1535 * for hardlink creation, adding (nlinks) to the file's link count and
1536 * potentially relocating the inode to (cdip) which is a parent directory
1537 * common to both the current location of the inode and the intended new
1540 * Replaces (*clusterp) if consolidation occurred, unlocking the old cluster
1541 * and returning a new locked cluster.
1543 * NOTE! This function will also replace ip->cluster.
1546 hammer2_hardlink_consolidate(hammer2_trans_t *trans,
1547 hammer2_inode_t *ip,
1548 hammer2_cluster_t **clusterp,
1549 hammer2_inode_t *cdip,
1550 hammer2_cluster_t *cdcluster,
1553 const hammer2_inode_data_t *ripdata;
1554 hammer2_inode_data_t *wipdata;
1555 hammer2_cluster_t *cluster;
1556 hammer2_cluster_t *cparent;
1559 cluster = *clusterp;
1560 ripdata = &hammer2_cluster_data(cluster)->ipdata;
1561 if (nlinks == 0 && /* no hardlink needed */
1562 (ripdata->name_key & HAMMER2_DIRHASH_VISIBLE)) {
1566 if (hammer2_hardlink_enable == 0) { /* disallow hardlinks */
1567 hammer2_cluster_unlock(cluster);
1575 * If no change in the hardlink's target directory is required and
1576 * this is already a hardlink target, all we need to do is adjust
1579 ripdata = &hammer2_cluster_data(cluster)->ipdata;
1580 if (cdip == ip->pip &&
1581 (ripdata->name_key & HAMMER2_DIRHASH_VISIBLE) == 0) {
1583 hammer2_cluster_modify(trans, cluster, 0);
1584 wipdata = &hammer2_cluster_wdata(cluster)->ipdata;
1585 wipdata->nlinks += nlinks;
1586 hammer2_cluster_modsync(cluster);
1594 * Cluster is the real inode. The originating directory is locked
1595 * by the caller so we can manipulate it without worrying about races
1596 * against other lookups.
1598 * If cluster is visible we need to delete it from the current
1599 * location and create a hardlink pointer in its place. If it is
1600 * not visible we need only delete it. Then later cluster will be
1601 * renamed to a parent directory and converted (if necessary) to
1602 * a hidden inode (via shiftup).
1604 * NOTE! We must hold cparent locked through the delete/create/rename
1605 * operation to ensure that other threads block resolving to
1606 * the same hardlink, otherwise the other threads may not see
1609 KKASSERT((cluster->focus->flags & HAMMER2_CHAIN_DELETED) == 0);
1610 cparent = hammer2_cluster_parent(cluster);
1612 hammer2_cluster_delete(trans, cparent, cluster, 0);
1614 ripdata = &hammer2_cluster_data(cluster)->ipdata;
1615 KKASSERT(ripdata->type != HAMMER2_OBJTYPE_HARDLINK);
1616 if (ripdata->name_key & HAMMER2_DIRHASH_VISIBLE) {
1617 hammer2_cluster_t *ncluster;
1621 lhc = cluster->focus->bref.key;
1622 error = hammer2_cluster_create(trans, cparent, &ncluster,
1624 HAMMER2_BREF_TYPE_INODE,
1625 HAMMER2_INODE_BYTES,
1627 hammer2_cluster_modify(trans, ncluster, 0);
1628 wipdata = &hammer2_cluster_wdata(ncluster)->ipdata;
1630 /* wipdata->comp_algo = ripdata->comp_algo; */
1631 wipdata->comp_algo = 0;
1632 wipdata->check_algo = 0;
1633 wipdata->version = HAMMER2_INODE_VERSION_ONE;
1634 wipdata->inum = ripdata->inum;
1635 wipdata->target_type = ripdata->type;
1636 wipdata->type = HAMMER2_OBJTYPE_HARDLINK;
1637 wipdata->uflags = 0;
1638 wipdata->rmajor = 0;
1639 wipdata->rminor = 0;
1644 bzero(&wipdata->uid, sizeof(wipdata->uid));
1645 bzero(&wipdata->gid, sizeof(wipdata->gid));
1646 wipdata->op_flags = HAMMER2_OPFLAG_DIRECTDATA;
1647 wipdata->cap_flags = 0;
1650 wipdata->nlinks = 1;
1651 wipdata->iparent = 0; /* XXX */
1652 wipdata->pfs_type = 0;
1653 wipdata->pfs_inum = 0;
1654 bzero(&wipdata->pfs_clid, sizeof(wipdata->pfs_clid));
1655 bzero(&wipdata->pfs_fsid, sizeof(wipdata->pfs_fsid));
1656 wipdata->data_quota = 0;
1657 wipdata->data_count = 0;
1658 wipdata->inode_quota = 0;
1659 wipdata->inode_count = 0;
1660 wipdata->attr_tid = 0;
1661 wipdata->dirent_tid = 0;
1662 bzero(&wipdata->u, sizeof(wipdata->u));
1663 bcopy(ripdata->filename, wipdata->filename, ripdata->name_len);
1664 wipdata->name_key = ncluster->focus->bref.key;
1665 wipdata->name_len = ripdata->name_len;
1666 /* XXX transaction ids */
1667 hammer2_cluster_modsync(ncluster);
1668 hammer2_cluster_unlock(ncluster);
1673 * cluster represents the hardlink target and is now flagged deleted.
1674 * duplicate it to the parent directory and adjust nlinks.
1676 * WARNING! The shiftup() call can cause ncluster to be moved into
1677 * an indirect block, and our ncluster will wind up pointing
1678 * to the older/original version.
1680 KKASSERT(cluster->focus->flags & HAMMER2_CHAIN_DELETED);
1681 hammer2_hardlink_shiftup(trans, cluster, cdip, cdcluster,
1685 hammer2_inode_repoint(ip, cdip, cluster);
1689 * Cleanup, cluster/ncluster already dealt with.
1691 * Return the shifted cluster in *clusterp.
1694 hammer2_cluster_unlock(cparent);
1695 *clusterp = cluster;
1701 * If (*ochainp) is non-NULL it points to the forward OBJTYPE_HARDLINK
1702 * inode while (*chainp) points to the resolved (hidden hardlink
1703 * target) inode. In this situation when nlinks is 1 we wish to
1704 * deconsolidate the hardlink, moving it back to the directory that now
1705 * represents the only remaining link.
1708 hammer2_hardlink_deconsolidate(hammer2_trans_t *trans,
1709 hammer2_inode_t *dip,
1710 hammer2_chain_t **chainp,
1711 hammer2_chain_t **ochainp)
1713 if (*ochainp == NULL)
1720 * The caller presents a locked cluster with an obj_type of
1721 * HAMMER2_OBJTYPE_HARDLINK. This routine will locate and replace the
1722 * cluster with the target hardlink, also locked.
1724 * If cparentp is not NULL a locked cluster representing the hardlink's
1725 * parent is also returned.
1727 * If we are unable to locate the hardlink target EIO is returned and
1728 * (*cparentp) is set to NULL. The passed-in cluster still needs to be
1729 * unlocked by the caller but will be degenerate... not have any chains.
1732 hammer2_hardlink_find(hammer2_inode_t *dip,
1733 hammer2_cluster_t **cparentp, hammer2_cluster_t *cluster)
1735 const hammer2_inode_data_t *ipdata;
1736 hammer2_cluster_t *cparent;
1737 hammer2_cluster_t *rcluster;
1738 hammer2_inode_t *ip;
1739 hammer2_inode_t *pip;
1740 hammer2_key_t key_dummy;
1745 hammer2_inode_ref(pip); /* for loop */
1748 * Locate the hardlink. pip is referenced and not locked.
1750 ipdata = &hammer2_cluster_data(cluster)->ipdata;
1754 * We don't need the cluster's chains, but we need to retain the
1755 * cluster structure itself so we can load the hardlink search
1758 KKASSERT(cluster->refs == 1);
1759 atomic_add_int(&cluster->refs, 1);
1760 hammer2_cluster_unlock(cluster); /* hack */
1761 cluster->nchains = 0; /* hack */
1766 while ((ip = pip) != NULL) {
1767 cparent = hammer2_inode_lock_ex(ip);
1768 hammer2_inode_drop(ip); /* loop */
1769 KKASSERT(hammer2_cluster_type(cparent) ==
1770 HAMMER2_BREF_TYPE_INODE);
1771 rcluster = hammer2_cluster_lookup(cparent, &key_dummy,
1772 lhc, lhc, 0, &ddflag);
1775 hammer2_cluster_lookup_done(cparent); /* discard parent */
1776 cparent = NULL; /* safety */
1777 pip = ip->pip; /* safe, ip held locked */
1779 hammer2_inode_ref(pip); /* loop */
1780 hammer2_inode_unlock_ex(ip, NULL);
1784 * chain is locked, ip is locked. Unlock ip, return the locked
1785 * chain. *ipp is already set w/a ref count and not locked.
1787 * (cparent is already unlocked).
1790 hammer2_cluster_replace(cluster, rcluster);
1791 hammer2_cluster_drop(rcluster);
1793 *cparentp = cparent;
1794 hammer2_inode_unlock_ex(ip, NULL);
1796 hammer2_inode_unlock_ex(ip, cparent);
1803 hammer2_inode_unlock_ex(ip, cparent);
1809 * Find the directory common to both fdip and tdip.
1811 * Returns a held but not locked inode. Caller typically locks the inode,
1812 * and when through unlocks AND drops it.
1815 hammer2_inode_common_parent(hammer2_inode_t *fdip, hammer2_inode_t *tdip)
1817 hammer2_inode_t *scan1;
1818 hammer2_inode_t *scan2;
1821 * We used to have a depth field but it complicated matters too
1822 * much for directory renames. So now its ugly. Check for
1823 * simple cases before giving up and doing it the expensive way.
1825 * XXX need a bottom-up topology stability lock
1827 if (fdip == tdip || fdip == tdip->pip) {
1828 hammer2_inode_ref(fdip);
1831 if (fdip->pip == tdip) {
1832 hammer2_inode_ref(tdip);
1839 for (scan1 = fdip; scan1->pmp == fdip->pmp; scan1 = scan1->pip) {
1841 while (scan2->pmp == tdip->pmp) {
1842 if (scan1 == scan2) {
1843 hammer2_inode_ref(scan1);
1851 panic("hammer2_inode_common_parent: no common parent %p %p\n",
1858 * Synchronize the inode's frontend state with the chain state prior
1859 * to any explicit flush of the inode or any strategy write call.
1861 * Called with a locked inode.
1864 hammer2_inode_fsync(hammer2_trans_t *trans, hammer2_inode_t *ip,
1865 hammer2_cluster_t *cparent)
1867 const hammer2_inode_data_t *ripdata;
1868 hammer2_inode_data_t *wipdata;
1869 hammer2_cluster_t *dparent;
1870 hammer2_cluster_t *cluster;
1871 hammer2_key_t lbase;
1872 hammer2_key_t key_next;
1876 ripdata = &hammer2_cluster_data(cparent)->ipdata; /* target file */
1878 if (ip->flags & HAMMER2_INODE_MTIME) {
1879 wipdata = hammer2_cluster_modify_ip(trans, ip, cparent, 0);
1880 atomic_clear_int(&ip->flags, HAMMER2_INODE_MTIME);
1881 wipdata->mtime = ip->mtime;
1885 if ((ip->flags & HAMMER2_INODE_RESIZED) && ip->size < ripdata->size) {
1886 wipdata = hammer2_cluster_modify_ip(trans, ip, cparent, 0);
1887 wipdata->size = ip->size;
1890 atomic_clear_int(&ip->flags, HAMMER2_INODE_RESIZED);
1893 * We must delete any chains beyond the EOF. The chain
1894 * straddling the EOF will be pending in the bioq.
1896 lbase = (ripdata->size + HAMMER2_PBUFMASK64) &
1897 ~HAMMER2_PBUFMASK64;
1898 dparent = hammer2_cluster_lookup_init(&ip->cluster, 0);
1899 cluster = hammer2_cluster_lookup(dparent, &key_next,
1900 lbase, (hammer2_key_t)-1,
1901 HAMMER2_LOOKUP_NODATA,
1905 * Degenerate embedded case, nothing to loop on
1907 switch (hammer2_cluster_type(cluster)) {
1908 case HAMMER2_BREF_TYPE_INODE:
1909 hammer2_cluster_unlock(cluster);
1912 case HAMMER2_BREF_TYPE_DATA:
1913 hammer2_cluster_delete(trans, dparent, cluster,
1914 HAMMER2_DELETE_PERMANENT);
1917 cluster = hammer2_cluster_next(dparent, cluster,
1919 key_next, (hammer2_key_t)-1,
1920 HAMMER2_LOOKUP_NODATA);
1924 hammer2_cluster_lookup_done(dparent);
1926 if ((ip->flags & HAMMER2_INODE_RESIZED) && ip->size > ripdata->size) {
1927 wipdata = hammer2_cluster_modify_ip(trans, ip, cparent, 0);
1928 wipdata->size = ip->size;
1929 atomic_clear_int(&ip->flags, HAMMER2_INODE_RESIZED);
1932 * When resizing larger we may not have any direct-data
1935 if ((wipdata->op_flags & HAMMER2_OPFLAG_DIRECTDATA) &&
1936 ip->size > HAMMER2_EMBEDDED_BYTES) {
1937 wipdata->op_flags &= ~HAMMER2_OPFLAG_DIRECTDATA;
1938 bzero(&wipdata->u.blockset,
1939 sizeof(wipdata->u.blockset));
1945 hammer2_cluster_modsync(cparent);