2 * Copyright (c) 2011-2013 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;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * This subsystem implements most of the core support functions for
37 * the hammer2_chain structure.
39 * Chains are the in-memory version on media objects (volume header, inodes,
40 * indirect blocks, data blocks, etc). Chains represent a portion of the
43 * A chain is topologically stable once it has been inserted into the
44 * in-memory topology. Modifications which copy, move, or resize the chain
45 * are handled via the DELETE-DUPLICATE mechanic where the original chain
46 * stays intact but is marked deleted and a new chain is allocated which
47 * shares the old chain's children.
49 * This sharing is handled via the hammer2_chain_core structure.
51 * The DELETE-DUPLICATE mechanism allows the same topological level to contain
52 * many overloadings. However, our RBTREE mechanics require that there be
53 * no overlaps so we accomplish the overloading by moving conflicting chains
54 * with smaller or equal radii into a sub-RBTREE under the chain being
57 * DELETE-DUPLICATE is also used when a modification to a chain crosses a
58 * flush synchronization boundary, allowing the flush code to continue flushing
59 * the older version of the topology and not be disrupted by new frontend
62 #include <sys/cdefs.h>
63 #include <sys/param.h>
64 #include <sys/systm.h>
65 #include <sys/types.h>
67 #include <sys/kern_syscall.h>
72 static int hammer2_indirect_optimize; /* XXX SYSCTL */
74 static hammer2_chain_t *hammer2_chain_create_indirect(
75 hammer2_trans_t *trans, hammer2_chain_t *parent,
76 hammer2_key_t key, int keybits, int for_type, int *errorp);
77 static void hammer2_chain_drop_data(hammer2_chain_t *chain, int lastdrop);
78 static void adjreadcounter(hammer2_blockref_t *bref, size_t bytes);
79 static hammer2_chain_t *hammer2_combined_find(
80 hammer2_chain_t *parent,
81 hammer2_blockref_t *base, int count,
82 int *cache_indexp, hammer2_key_t *key_nextp,
83 hammer2_key_t key_beg, hammer2_key_t key_end,
84 hammer2_blockref_t **bresp);
87 * Basic RBTree for chains. Chains cannot overlap within any given
88 * core->rbtree without recursing through chain->rbtree. We effectively
89 * guarantee this by checking the full range rather than just the first
90 * key element. By matching on the full range callers can detect when
91 * recursrion through chain->rbtree is needed.
93 * NOTE: This also means the a delete-duplicate on the same key will
94 * overload by placing the deleted element in the new element's
95 * chain->rbtree (when doing a direct replacement).
97 RB_GENERATE(hammer2_chain_tree, hammer2_chain, rbnode, hammer2_chain_cmp);
100 hammer2_chain_cmp(hammer2_chain_t *chain1, hammer2_chain_t *chain2)
102 hammer2_key_t c1_beg;
103 hammer2_key_t c1_end;
104 hammer2_key_t c2_beg;
105 hammer2_key_t c2_end;
107 c1_beg = chain1->bref.key;
108 c1_end = c1_beg + ((hammer2_key_t)1 << chain1->bref.keybits) - 1;
109 c2_beg = chain2->bref.key;
110 c2_end = c2_beg + ((hammer2_key_t)1 << chain2->bref.keybits) - 1;
112 if (c1_end < c2_beg) /* fully to the left */
114 if (c1_beg > c2_end) /* fully to the right */
116 return(0); /* overlap (must not cross edge boundary) */
121 hammer2_isclusterable(hammer2_chain_t *chain)
123 if (hammer2_cluster_enable) {
124 if (chain->bref.type == HAMMER2_BREF_TYPE_INDIRECT ||
125 chain->bref.type == HAMMER2_BREF_TYPE_INODE ||
126 chain->bref.type == HAMMER2_BREF_TYPE_DATA) {
134 * Recursively set the SUBMODIFIED flag up to the root starting at chain's
135 * parent. SUBMODIFIED is not set in chain itself.
137 * This function always runs up the live tree. The flush code can cause
138 * modifications under dead parents which are being flush synchronized
139 * and will handle this flag itself.
142 hammer2_chain_setsubmod(hammer2_trans_t *trans, hammer2_chain_t *chain)
144 hammer2_chain_core_t *above;
146 if (trans->flags & HAMMER2_TRANS_ISFLUSH)
148 while ((above = chain->above) != NULL) {
149 spin_lock(&above->cst.spin);
150 chain = TAILQ_FIRST(&above->ownerq);
151 while (chain->flags & HAMMER2_CHAIN_DUPLICATED)
152 chain = TAILQ_NEXT(chain, core_entry);
153 atomic_set_int(&chain->flags, HAMMER2_CHAIN_SUBMODIFIED);
154 spin_unlock(&above->cst.spin);
159 * Allocate a new disconnected chain element representing the specified
160 * bref. chain->refs is set to 1 and the passed bref is copied to
161 * chain->bref. chain->bytes is derived from the bref.
163 * chain->core is NOT allocated and the media data and bp pointers are left
164 * NULL. The caller must call chain_core_alloc() to allocate or associate
165 * a core with the chain.
167 * NOTE: Returns a referenced but unlocked (because there is no core) chain.
170 hammer2_chain_alloc(hammer2_mount_t *hmp, hammer2_pfsmount_t *pmp,
171 hammer2_trans_t *trans, hammer2_blockref_t *bref)
173 hammer2_chain_t *chain;
174 u_int bytes = 1U << (int)(bref->data_off & HAMMER2_OFF_MASK_RADIX);
177 * Construct the appropriate system structure.
180 case HAMMER2_BREF_TYPE_INODE:
181 case HAMMER2_BREF_TYPE_INDIRECT:
182 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
183 case HAMMER2_BREF_TYPE_DATA:
184 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
186 * Chain's are really only associated with the hmp but we
187 * maintain a pmp association for per-mount memory tracking
188 * purposes. The pmp can be NULL.
190 chain = kmalloc(sizeof(*chain), hmp->mchain, M_WAITOK | M_ZERO);
193 atomic_add_long(&pmp->inmem_chains, 1);
196 case HAMMER2_BREF_TYPE_VOLUME:
197 case HAMMER2_BREF_TYPE_FREEMAP:
199 panic("hammer2_chain_alloc volume type illegal for op");
202 panic("hammer2_chain_alloc: unrecognized blockref type: %d",
208 chain->bytes = bytes;
210 chain->flags = HAMMER2_CHAIN_ALLOCATED;
211 chain->delete_tid = HAMMER2_MAX_TID;
213 chain->modify_tid = trans->sync_tid;
219 * Associate an existing core with the chain or allocate a new core.
221 * The core is not locked. No additional refs on the chain are made.
222 * (trans) must not be NULL if (core) is not NULL.
224 * When chains are delete-duplicated during flushes we insert nchain on
225 * the ownerq after ochain instead of at the end in order to give the
226 * drop code visibility in the correct order, otherwise drops can be missed.
229 hammer2_chain_core_alloc(hammer2_trans_t *trans,
230 hammer2_chain_t *nchain, hammer2_chain_t *ochain)
232 hammer2_chain_core_t *core;
234 KKASSERT(nchain->core == NULL);
236 if (ochain == NULL) {
238 * Fresh core under nchain (no multi-homing of ochain's
241 core = kmalloc(sizeof(*core), nchain->hmp->mchain,
243 TAILQ_INIT(&core->layerq);
244 TAILQ_INIT(&core->ownerq);
248 ccms_cst_init(&core->cst, nchain);
249 TAILQ_INSERT_TAIL(&core->ownerq, nchain, core_entry);
252 * Propagate the PFSROOT flag which we set on all subdirs
253 * under the super-root.
255 atomic_set_int(&nchain->flags,
256 ochain->flags & HAMMER2_CHAIN_PFSROOT);
259 * Multi-homing (delete-duplicate) sub-tree under ochain.
260 * Set the DUPLICATED flag on ochain but only if this is
261 * not a snapshot. This flag governs forward iterations
262 * for any refactor tests.
264 * It is not legal for the DUPLICATED flag to already be
265 * set. This indicates that the caller is trying to
266 * delete-duplicate a stale chain. The flusher can modify
267 * a stale chain as part of its synchronization point handling
268 * in order to update the block table (and it will
269 * carry-forward such modifications automatically), but it
270 * has no business delete-duplicating it.
272 KKASSERT((ochain->flags & HAMMER2_CHAIN_DUPLICATED) == 0);
273 if ((nchain->flags & HAMMER2_CHAIN_SNAPSHOT) == 0) {
274 atomic_set_int(&ochain->flags,
275 HAMMER2_CHAIN_DUPLICATED);
278 atomic_add_int(&core->sharecnt, 1);
280 spin_lock(&core->cst.spin);
284 * Maintain ordering for refactor test so we don't skip over
288 TAILQ_INSERT_AFTER(&core->ownerq, ochain, nchain, core_entry);
290 if (trans->flags & HAMMER2_TRANS_ISFLUSH) {
291 TAILQ_INSERT_AFTER(&core->ownerq, ochain, nchain,
294 TAILQ_INSERT_TAIL(&core->ownerq, nchain, core_entry);
297 spin_unlock(&core->cst.spin);
302 * Add a reference to a chain element, preventing its destruction.
305 hammer2_chain_ref(hammer2_chain_t *chain)
307 atomic_add_int(&chain->refs, 1);
311 * Insert the chain in the core rbtree at the first layer
312 * which accepts it (for now we don't sort layers by the transaction tid)
314 #define HAMMER2_CHAIN_INSERT_SPIN 0x0001
315 #define HAMMER2_CHAIN_INSERT_LIVE 0x0002
316 #define HAMMER2_CHAIN_INSERT_RACE 0x0004
320 hammer2_chain_insert(hammer2_chain_core_t *above, hammer2_chain_t *chain,
323 hammer2_chain_layer_t *layer;
324 hammer2_chain_t *xchain;
326 if (flags & HAMMER2_CHAIN_INSERT_SPIN)
327 spin_lock(&above->cst.spin);
328 chain->above = above;
329 layer = TAILQ_FIRST(&above->layerq);
336 (xchain = RB_INSERT(hammer2_chain_tree,
337 &layer->rbtree, chain)) != NULL) {
339 * Either no layers have been allocated or the insertion
340 * failed. This is fatal if the conflicted xchain is not
341 * flagged as deleted. Caller may or may allow the failure.
343 if (xchain && (xchain->flags & HAMMER2_CHAIN_DELETED) == 0) {
344 if (flags & HAMMER2_CHAIN_INSERT_RACE) {
346 chain->inlayer = NULL;
347 kprintf("insertion race against %p\n", xchain);
350 panic("hammer2_chain_insert: collision2 %p", xchain);
354 * Allocate a new layer to resolve the issue.
356 spin_unlock(&above->cst.spin);
357 layer = kmalloc(sizeof(*layer), chain->hmp->mchain,
359 RB_INIT(&layer->rbtree);
360 layer->good = 0xABCD;
361 spin_lock(&above->cst.spin);
362 TAILQ_INSERT_HEAD(&above->layerq, layer, entry);
363 RB_INSERT(hammer2_chain_tree, &layer->rbtree, chain);
365 chain->inlayer = layer;
366 ++above->chain_count;
368 if (flags & HAMMER2_CHAIN_INSERT_LIVE)
369 atomic_add_int(&above->live_count, 1);
370 atomic_set_int(&chain->flags, HAMMER2_CHAIN_ONRBTREE);
372 if (flags & HAMMER2_CHAIN_INSERT_SPIN)
373 spin_unlock(&above->cst.spin);
377 * Drop the caller's reference to the chain. When the ref count drops to
378 * zero this function will disassociate the chain from its parent and
379 * deallocate it, then recursely drop the parent using the implied ref
380 * from the chain's chain->parent.
382 * WARNING! Just because we are able to deallocate a chain doesn't mean
383 * that chain->core->rbtree is empty. There can still be a sharecnt
384 * on chain->core and RBTREE entries that refer to different parents.
386 static hammer2_chain_t *hammer2_chain_lastdrop(hammer2_chain_t *chain);
389 hammer2_chain_drop(hammer2_chain_t *chain)
395 if (chain->flags & HAMMER2_CHAIN_MOVED)
397 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
399 KKASSERT(chain->refs > need);
407 chain = hammer2_chain_lastdrop(chain);
409 if (atomic_cmpset_int(&chain->refs, refs, refs - 1))
411 /* retry the same chain */
417 * Safe handling of the 1->0 transition on chain. Returns a chain for
418 * recursive drop or NULL, possibly returning the same chain if the atomic
421 * The cst spinlock is allowed nest child-to-parent (not parent-to-child).
425 hammer2_chain_lastdrop(hammer2_chain_t *chain)
427 hammer2_pfsmount_t *pmp;
428 hammer2_mount_t *hmp;
429 hammer2_chain_core_t *above;
430 hammer2_chain_core_t *core;
431 hammer2_chain_layer_t *layer;
432 hammer2_chain_t *rdrop1;
433 hammer2_chain_t *rdrop2;
436 * Spinlock the core and check to see if it is empty. If it is
437 * not empty we leave chain intact with refs == 0. The elements
438 * in core->rbtree are associated with other chains contemporary
439 * with ours but not with our chain directly.
441 if ((core = chain->core) != NULL) {
442 spin_lock(&core->cst.spin);
445 * We can't drop any chains if they have children because
446 * there might be a flush dependency.
448 * NOTE: We return (chain) on failure to retry.
450 if (core->chain_count) {
451 if (atomic_cmpset_int(&chain->refs, 1, 0))
452 chain = NULL; /* success */
453 spin_unlock(&core->cst.spin);
456 /* no chains left under us */
459 * We can't drop a live chain unless it is a the head
460 * of its ownerq. If we were to then the go-to chain
461 * would revert to the prior deleted chain.
463 if ((chain->flags & HAMMER2_CHAIN_DELETED) == 0 &&
464 (chain->flags & HAMMER2_CHAIN_SNAPSHOT) == 0 &&
465 TAILQ_FIRST(&core->ownerq) != chain) {
466 if (atomic_cmpset_int(&chain->refs, 1, 0))
467 chain = NULL; /* success */
468 spin_unlock(&core->cst.spin);
475 pmp = chain->pmp; /* can be NULL */
481 * Spinlock the parent and try to drop the last ref. On success
482 * remove chain from its parent, otherwise return NULL.
484 * (multiple spinlocks on core's are allowed in a bottom-up fashion).
486 if ((above = chain->above) != NULL) {
487 spin_lock(&above->cst.spin);
488 if (!atomic_cmpset_int(&chain->refs, 1, 0)) {
489 /* 1->0 transition failed */
490 spin_unlock(&above->cst.spin);
492 spin_unlock(&core->cst.spin);
493 return(chain); /* retry */
497 * 1->0 transition successful, remove chain from its
498 * above core. Track layer for removal/freeing.
500 KKASSERT(chain->flags & HAMMER2_CHAIN_ONRBTREE);
501 layer = chain->inlayer;
502 RB_REMOVE(hammer2_chain_tree, &layer->rbtree, chain);
503 --above->chain_count;
504 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_ONRBTREE);
506 chain->inlayer = NULL;
508 if (RB_EMPTY(&layer->rbtree) && layer->refs == 0) {
509 TAILQ_REMOVE(&above->layerq, layer, entry);
516 * If our chain was the last chain in the parent's core the
517 * core is now empty. Try to drop the first multi-homed
520 if (above->chain_count == 0) {
521 rdrop1 = TAILQ_FIRST(&above->ownerq);
523 atomic_cmpset_int(&rdrop1->refs, 0, 1) == 0) {
528 spin_unlock(&above->cst.spin);
529 above = NULL; /* safety */
533 * We still have the core spinlock (if core is non-NULL). The
534 * above spinlock is gone.
536 * Remove chain from ownerq. This may change the first element of
537 * ownerq to something we can remove.
542 TAILQ_REMOVE(&core->ownerq, chain, core_entry);
543 rdrop2 = TAILQ_FIRST(&core->ownerq);
545 atomic_cmpset_int(&rdrop2->refs, 0, 1) == 0) {
548 spin_unlock(&core->cst.spin);
551 * We can do the final 1->0 transition with an atomic op
552 * after releasing core's spinlock.
554 if (atomic_fetchadd_int(&core->sharecnt, -1) == 1) {
556 * On the 1->0 transition of core we can destroy
557 * it. Any remaining layers should no longer be
558 * referenced or visibile to other threads.
560 KKASSERT(TAILQ_EMPTY(&core->ownerq));
562 layer->good = 0xEF00;
563 kfree(layer, hmp->mchain);
565 while ((layer = TAILQ_FIRST(&core->layerq)) != NULL) {
566 KKASSERT(layer->refs == 0 &&
567 RB_EMPTY(&layer->rbtree));
568 TAILQ_REMOVE(&core->layerq, layer, entry);
569 layer->good = 0xEF01;
570 kfree(layer, hmp->mchain);
573 KKASSERT(core->cst.count == 0);
574 KKASSERT(core->cst.upgrade == 0);
576 kfree(core, hmp->mchain);
578 core = NULL; /* safety */
582 * All spin locks are gone, finish freeing stuff.
584 KKASSERT((chain->flags & (HAMMER2_CHAIN_MOVED |
585 HAMMER2_CHAIN_MODIFIED)) == 0);
586 hammer2_chain_drop_data(chain, 1);
588 KKASSERT(chain->bp == NULL);
591 if (chain->flags & HAMMER2_CHAIN_ALLOCATED) {
592 chain->flags &= ~HAMMER2_CHAIN_ALLOCATED;
593 kfree(chain, hmp->mchain);
595 atomic_add_long(&pmp->inmem_chains, -1);
596 hammer2_chain_memory_wakeup(pmp);
601 * Free saved empty layer and return chained drop.
604 layer->good = 0xEF02;
605 kfree(layer, hmp->mchain);
608 hammer2_chain_drop(rdrop2);
613 * On either last lock release or last drop
616 hammer2_chain_drop_data(hammer2_chain_t *chain, int lastdrop)
618 hammer2_mount_t *hmp = chain->hmp;
620 switch(chain->bref.type) {
621 case HAMMER2_BREF_TYPE_VOLUME:
622 case HAMMER2_BREF_TYPE_FREEMAP:
626 case HAMMER2_BREF_TYPE_INODE:
628 kfree(chain->data, hmp->mchain);
632 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
634 kfree(chain->data, hmp->mchain);
639 KKASSERT(chain->data == NULL);
645 * Ref and lock a chain element, acquiring its data with I/O if necessary,
646 * and specify how you would like the data to be resolved.
648 * Returns 0 on success or an error code if the data could not be acquired.
649 * The chain element is locked on return regardless of whether an error
652 * The lock is allowed to recurse, multiple locking ops will aggregate
653 * the requested resolve types. Once data is assigned it will not be
654 * removed until the last unlock.
656 * HAMMER2_RESOLVE_NEVER - Do not resolve the data element.
657 * (typically used to avoid device/logical buffer
660 * HAMMER2_RESOLVE_MAYBE - Do not resolve data elements for chains in
661 * the INITIAL-create state (indirect blocks only).
663 * Do not resolve data elements for DATA chains.
664 * (typically used to avoid device/logical buffer
667 * HAMMER2_RESOLVE_ALWAYS- Always resolve the data element.
669 * HAMMER2_RESOLVE_SHARED- (flag) The chain is locked shared, otherwise
670 * it will be locked exclusive.
672 * NOTE: Embedded elements (volume header, inodes) are always resolved
675 * NOTE: Specifying HAMMER2_RESOLVE_ALWAYS on a newly-created non-embedded
676 * element will instantiate and zero its buffer, and flush it on
679 * NOTE: (data) elements are normally locked RESOLVE_NEVER or RESOLVE_MAYBE
680 * so as not to instantiate a device buffer, which could alias against
681 * a logical file buffer. However, if ALWAYS is specified the
682 * device buffer will be instantiated anyway.
684 * WARNING! If data must be fetched a shared lock will temporarily be
685 * upgraded to exclusive. However, a deadlock can occur if
686 * the caller owns more than one shared lock.
689 hammer2_chain_lock(hammer2_chain_t *chain, int how)
691 hammer2_mount_t *hmp;
692 hammer2_chain_core_t *core;
693 hammer2_blockref_t *bref;
704 * Ref and lock the element. Recursive locks are allowed.
706 if ((how & HAMMER2_RESOLVE_NOREF) == 0)
707 hammer2_chain_ref(chain);
708 atomic_add_int(&chain->lockcnt, 1);
711 KKASSERT(hmp != NULL);
714 * Get the appropriate lock.
717 if (how & HAMMER2_RESOLVE_SHARED)
718 ccms_thread_lock(&core->cst, CCMS_STATE_SHARED);
720 ccms_thread_lock(&core->cst, CCMS_STATE_EXCLUSIVE);
723 * If we already have a valid data pointer no further action is
730 * Do we have to resolve the data?
732 switch(how & HAMMER2_RESOLVE_MASK) {
733 case HAMMER2_RESOLVE_NEVER:
735 case HAMMER2_RESOLVE_MAYBE:
736 if (chain->flags & HAMMER2_CHAIN_INITIAL)
738 if (chain->bref.type == HAMMER2_BREF_TYPE_DATA)
741 if (chain->bref.type == HAMMER2_BREF_TYPE_FREEMAP_NODE)
744 if (chain->bref.type == HAMMER2_BREF_TYPE_FREEMAP_LEAF)
747 case HAMMER2_RESOLVE_ALWAYS:
752 * Upgrade to an exclusive lock so we can safely manipulate the
753 * buffer cache. If another thread got to it before us we
756 ostate = ccms_thread_lock_upgrade(&core->cst);
758 ccms_thread_lock_downgrade(&core->cst, ostate);
763 * We must resolve to a device buffer, either by issuing I/O or
764 * by creating a zero-fill element. We do not mark the buffer
765 * dirty when creating a zero-fill element (the hammer2_chain_modify()
766 * API must still be used to do that).
768 * The device buffer is variable-sized in powers of 2 down
769 * to HAMMER2_MIN_ALLOC (typically 1K). A 64K physical storage
770 * chunk always contains buffers of the same size. (XXX)
772 * The minimum physical IO size may be larger than the variable
777 psize = hammer2_devblksize(chain->bytes);
778 pmask = (hammer2_off_t)psize - 1;
779 pbase = bref->data_off & ~pmask;
780 boff = bref->data_off & (HAMMER2_OFF_MASK & pmask);
781 KKASSERT(pbase != 0);
782 peof = (pbase + HAMMER2_SEGMASK64) & ~HAMMER2_SEGMASK64;
785 * The getblk() optimization can only be used on newly created
786 * elements if the physical block size matches the request.
788 if ((chain->flags & HAMMER2_CHAIN_INITIAL) &&
789 chain->bytes == psize) {
790 chain->bp = getblk(hmp->devvp, pbase, psize, 0, 0);
792 } else if (hammer2_isclusterable(chain)) {
793 error = cluster_read(hmp->devvp, peof, pbase, psize,
794 psize, HAMMER2_PBUFSIZE*4,
796 adjreadcounter(&chain->bref, chain->bytes);
798 error = bread(hmp->devvp, pbase, psize, &chain->bp);
799 adjreadcounter(&chain->bref, chain->bytes);
803 kprintf("hammer2_chain_lock: I/O error %016jx: %d\n",
804 (intmax_t)pbase, error);
807 ccms_thread_lock_downgrade(&core->cst, ostate);
812 * Zero the data area if the chain is in the INITIAL-create state.
813 * Mark the buffer for bdwrite(). This clears the INITIAL state
814 * but does not mark the chain modified.
816 bdata = (char *)chain->bp->b_data + boff;
817 if (chain->flags & HAMMER2_CHAIN_INITIAL) {
818 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
819 bzero(bdata, chain->bytes);
820 atomic_set_int(&chain->flags, HAMMER2_CHAIN_DIRTYBP);
824 * Setup the data pointer, either pointing it to an embedded data
825 * structure and copying the data from the buffer, or pointing it
828 * The buffer is not retained when copying to an embedded data
829 * structure in order to avoid potential deadlocks or recursions
830 * on the same physical buffer.
832 switch (bref->type) {
833 case HAMMER2_BREF_TYPE_VOLUME:
834 case HAMMER2_BREF_TYPE_FREEMAP:
836 * Copy data from bp to embedded buffer
838 panic("hammer2_chain_lock: called on unresolved volume header");
841 KKASSERT(pbase == 0);
842 KKASSERT(chain->bytes == HAMMER2_PBUFSIZE);
843 bcopy(bdata, &hmp->voldata, chain->bytes);
844 chain->data = (void *)&hmp->voldata;
849 case HAMMER2_BREF_TYPE_INODE:
851 * Copy data from bp to embedded buffer, do not retain the
854 KKASSERT(chain->bytes == sizeof(chain->data->ipdata));
855 atomic_set_int(&chain->flags, HAMMER2_CHAIN_EMBEDDED);
856 chain->data = kmalloc(sizeof(chain->data->ipdata),
857 hmp->mchain, M_WAITOK | M_ZERO);
858 bcopy(bdata, &chain->data->ipdata, chain->bytes);
862 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
863 KKASSERT(chain->bytes == sizeof(chain->data->bmdata));
864 atomic_set_int(&chain->flags, HAMMER2_CHAIN_EMBEDDED);
865 chain->data = kmalloc(sizeof(chain->data->bmdata),
866 hmp->mchain, M_WAITOK | M_ZERO);
867 bcopy(bdata, &chain->data->bmdata, chain->bytes);
871 case HAMMER2_BREF_TYPE_INDIRECT:
872 case HAMMER2_BREF_TYPE_DATA:
873 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
876 * Point data at the device buffer and leave bp intact.
878 chain->data = (void *)bdata;
883 * Make sure the bp is not specifically owned by this thread before
884 * restoring to a possibly shared lock, so another hammer2 thread
888 BUF_KERNPROC(chain->bp);
889 ccms_thread_lock_downgrade(&core->cst, ostate);
894 * Asynchronously read the device buffer (dbp) and execute the specified
895 * callback. The caller should pass-in a locked chain (shared lock is ok).
896 * The function is responsible for unlocking the chain and for disposing
899 * NOTE! A NULL dbp (but non-NULL data) will be passed to the function
900 * if the dbp is integrated into the chain, because we do not want
901 * the caller to dispose of dbp in that situation.
903 static void hammer2_chain_load_async_callback(struct bio *bio);
906 hammer2_chain_load_async(hammer2_chain_t *chain,
907 void (*func)(hammer2_chain_t *, struct buf *, char *, void *),
910 hammer2_cbinfo_t *cbinfo;
911 hammer2_mount_t *hmp;
912 hammer2_blockref_t *bref;
922 func(chain, NULL, (char *)chain->data, arg);
927 * We must resolve to a device buffer, either by issuing I/O or
928 * by creating a zero-fill element. We do not mark the buffer
929 * dirty when creating a zero-fill element (the hammer2_chain_modify()
930 * API must still be used to do that).
932 * The device buffer is variable-sized in powers of 2 down
933 * to HAMMER2_MIN_ALLOC (typically 1K). A 64K physical storage
934 * chunk always contains buffers of the same size. (XXX)
936 * The minimum physical IO size may be larger than the variable
941 psize = hammer2_devblksize(chain->bytes);
942 pmask = (hammer2_off_t)psize - 1;
943 pbase = bref->data_off & ~pmask;
944 boff = bref->data_off & (HAMMER2_OFF_MASK & pmask);
945 KKASSERT(pbase != 0);
946 peof = (pbase + HAMMER2_SEGMASK64) & ~HAMMER2_SEGMASK64;
951 * The getblk() optimization can only be used on newly created
952 * elements if the physical block size matches the request.
954 if ((chain->flags & HAMMER2_CHAIN_INITIAL) &&
955 chain->bytes == psize) {
956 dbp = getblk(hmp->devvp, pbase, psize, 0, 0);
957 /*atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);*/
958 bdata = (char *)dbp->b_data + boff;
959 bzero(bdata, chain->bytes);
960 /*atomic_set_int(&chain->flags, HAMMER2_CHAIN_DIRTYBP);*/
961 func(chain, dbp, bdata, arg);
966 adjreadcounter(&chain->bref, chain->bytes);
967 cbinfo = kmalloc(sizeof(*cbinfo), hmp->mchain, M_INTWAIT | M_ZERO);
968 cbinfo->chain = chain;
973 cluster_readcb(hmp->devvp, peof, pbase, psize,
974 HAMMER2_PBUFSIZE*4, HAMMER2_PBUFSIZE*4,
975 hammer2_chain_load_async_callback, cbinfo);
979 hammer2_chain_load_async_callback(struct bio *bio)
981 hammer2_cbinfo_t *cbinfo;
982 hammer2_mount_t *hmp;
987 * Nobody is waiting for bio/dbp to complete, we are
988 * responsible for handling the biowait() equivalent
989 * on dbp which means clearing BIO_DONE and BIO_SYNC
990 * and calling bpdone() if it hasn't already been called
991 * to restore any covered holes in the buffer's backing
995 if ((bio->bio_flags & BIO_DONE) == 0)
997 bio->bio_flags &= ~(BIO_DONE | BIO_SYNC);
1000 * Extract the auxillary info and issue the callback.
1001 * Finish up with the dbp after it returns.
1003 cbinfo = bio->bio_caller_info1.ptr;
1004 /*ccms_thread_lock_setown(cbinfo->chain->core);*/
1005 data = dbp->b_data + cbinfo->boff;
1006 hmp = cbinfo->chain->hmp;
1008 cbinfo = bio->bio_caller_info1.ptr;
1009 if (cbinfo->chain->flags & HAMMER2_CHAIN_INITIAL)
1010 bzero(data, cbinfo->chain->bytes);
1011 cbinfo->func(cbinfo->chain, dbp, data, cbinfo->arg);
1012 /* cbinfo->chain is stale now */
1014 kfree(cbinfo, hmp->mchain);
1018 * Unlock and deref a chain element.
1020 * On the last lock release any non-embedded data (chain->bp) will be
1024 hammer2_chain_unlock(hammer2_chain_t *chain)
1026 hammer2_chain_core_t *core = chain->core;
1027 ccms_state_t ostate;
1032 * The core->cst lock can be shared across several chains so we
1033 * need to track the per-chain lockcnt separately.
1035 * If multiple locks are present (or being attempted) on this
1036 * particular chain we can just unlock, drop refs, and return.
1038 * Otherwise fall-through on the 1->0 transition.
1041 lockcnt = chain->lockcnt;
1042 KKASSERT(lockcnt > 0);
1045 if (atomic_cmpset_int(&chain->lockcnt,
1046 lockcnt, lockcnt - 1)) {
1047 ccms_thread_unlock(&core->cst);
1048 hammer2_chain_drop(chain);
1052 if (atomic_cmpset_int(&chain->lockcnt, 1, 0))
1059 * On the 1->0 transition we upgrade the core lock (if necessary)
1060 * to exclusive for terminal processing. If after upgrading we find
1061 * that lockcnt is non-zero, another thread is racing us and will
1062 * handle the unload for us later on, so just cleanup and return
1063 * leaving the data/bp intact
1065 * Otherwise if lockcnt is still 0 it is possible for it to become
1066 * non-zero and race, but since we hold the core->cst lock
1067 * exclusively all that will happen is that the chain will be
1068 * reloaded after we unload it.
1070 ostate = ccms_thread_lock_upgrade(&core->cst);
1071 if (chain->lockcnt) {
1072 ccms_thread_unlock_upgraded(&core->cst, ostate);
1073 hammer2_chain_drop(chain);
1078 * Shortcut the case if the data is embedded or not resolved.
1080 * Do NOT NULL out chain->data (e.g. inode data), it might be
1083 * The DIRTYBP flag is non-applicable in this situation and can
1084 * be cleared to keep the flags state clean.
1086 if (chain->bp == NULL) {
1087 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_DIRTYBP);
1088 if ((chain->flags & HAMMER2_CHAIN_MODIFIED) == 0)
1089 hammer2_chain_drop_data(chain, 0);
1090 ccms_thread_unlock_upgraded(&core->cst, ostate);
1091 hammer2_chain_drop(chain);
1098 if ((chain->flags & HAMMER2_CHAIN_DIRTYBP) == 0) {
1100 } else if (chain->flags & HAMMER2_CHAIN_IOFLUSH) {
1101 switch(chain->bref.type) {
1102 case HAMMER2_BREF_TYPE_DATA:
1103 counterp = &hammer2_ioa_file_write;
1105 case HAMMER2_BREF_TYPE_INODE:
1106 counterp = &hammer2_ioa_meta_write;
1108 case HAMMER2_BREF_TYPE_INDIRECT:
1109 counterp = &hammer2_ioa_indr_write;
1111 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
1112 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
1113 counterp = &hammer2_ioa_fmap_write;
1116 counterp = &hammer2_ioa_volu_write;
1119 *counterp += chain->bytes;
1121 switch(chain->bref.type) {
1122 case HAMMER2_BREF_TYPE_DATA:
1123 counterp = &hammer2_iod_file_write;
1125 case HAMMER2_BREF_TYPE_INODE:
1126 counterp = &hammer2_iod_meta_write;
1128 case HAMMER2_BREF_TYPE_INDIRECT:
1129 counterp = &hammer2_iod_indr_write;
1131 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
1132 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
1133 counterp = &hammer2_iod_fmap_write;
1136 counterp = &hammer2_iod_volu_write;
1139 *counterp += chain->bytes;
1145 * If a device buffer was used for data be sure to destroy the
1146 * buffer when we are done to avoid aliases (XXX what about the
1147 * underlying VM pages?).
1149 * NOTE: Freemap leaf's use reserved blocks and thus no aliasing
1154 * XXX our primary cache is now the block device, not
1155 * the logical file. don't release the buffer.
1157 if (chain->bref.type == HAMMER2_BREF_TYPE_DATA)
1158 chain->bp->b_flags |= B_RELBUF;
1162 * The DIRTYBP flag tracks whether we have to bdwrite() the buffer
1163 * or not. The flag will get re-set when chain_modify() is called,
1164 * even if MODIFIED is already set, allowing the OS to retire the
1165 * buffer independent of a hammer2 flus.
1168 if (chain->flags & HAMMER2_CHAIN_DIRTYBP) {
1169 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_DIRTYBP);
1170 if (chain->flags & HAMMER2_CHAIN_IOFLUSH) {
1171 atomic_clear_int(&chain->flags,
1172 HAMMER2_CHAIN_IOFLUSH);
1173 chain->bp->b_flags |= B_RELBUF;
1174 cluster_awrite(chain->bp);
1176 chain->bp->b_flags |= B_CLUSTEROK;
1180 if (chain->flags & HAMMER2_CHAIN_IOFLUSH) {
1181 atomic_clear_int(&chain->flags,
1182 HAMMER2_CHAIN_IOFLUSH);
1183 chain->bp->b_flags |= B_RELBUF;
1186 /* bp might still be dirty */
1191 ccms_thread_unlock_upgraded(&core->cst, ostate);
1192 hammer2_chain_drop(chain);
1196 * This counts the number of live blockrefs in a block array and
1197 * also calculates the point at which all remaining blockrefs are empty.
1199 * NOTE: Flag is not set until after the count is complete, allowing
1200 * callers to test the flag without holding the spinlock.
1202 * NOTE: If base is NULL the related chain is still in the INITIAL
1203 * state and there are no blockrefs to count.
1205 * NOTE: live_count may already have some counts accumulated due to
1206 * creation and deletion and could even be initially negative.
1209 hammer2_chain_countbrefs(hammer2_chain_t *chain,
1210 hammer2_blockref_t *base, int count)
1212 hammer2_chain_core_t *core = chain->core;
1214 spin_lock(&core->cst.spin);
1215 if ((chain->flags & HAMMER2_CHAIN_COUNTEDBREFS) == 0) {
1217 while (--count >= 0) {
1218 if (base[count].type)
1221 chain->live_zero = count + 1;
1222 while (count >= 0) {
1223 if (base[count].type)
1224 atomic_add_int(&core->live_count, 1);
1228 chain->live_zero = 0;
1230 /* else do not modify live_count */
1231 atomic_set_int(&chain->flags, HAMMER2_CHAIN_COUNTEDBREFS);
1233 spin_unlock(&core->cst.spin);
1237 * Resize the chain's physical storage allocation in-place. This may
1238 * replace the passed-in chain with a new chain.
1240 * Chains can be resized smaller without reallocating the storage.
1241 * Resizing larger will reallocate the storage.
1243 * Must be passed an exclusively locked parent and chain, returns a new
1244 * exclusively locked chain at the same index and unlocks the old chain.
1245 * Flushes the buffer if necessary.
1247 * This function is mostly used with DATA blocks locked RESOLVE_NEVER in order
1248 * to avoid instantiating a device buffer that conflicts with the vnode
1249 * data buffer. That is, the passed-in bp is a logical buffer, whereas
1250 * any chain-oriented bp would be a device buffer.
1252 * XXX flags currently ignored, uses chain->bp to detect data/no-data.
1253 * XXX return error if cannot resize.
1256 hammer2_chain_resize(hammer2_trans_t *trans, hammer2_inode_t *ip,
1257 hammer2_chain_t *parent, hammer2_chain_t **chainp,
1258 int nradix, int flags)
1260 hammer2_mount_t *hmp;
1261 hammer2_chain_t *chain;
1262 hammer2_off_t pbase;
1272 * Only data and indirect blocks can be resized for now.
1273 * (The volu root, inodes, and freemap elements use a fixed size).
1275 KKASSERT(chain != &hmp->vchain);
1276 KKASSERT(chain->bref.type == HAMMER2_BREF_TYPE_DATA ||
1277 chain->bref.type == HAMMER2_BREF_TYPE_INDIRECT);
1280 * Nothing to do if the element is already the proper size
1282 obytes = chain->bytes;
1283 nbytes = 1U << nradix;
1284 if (obytes == nbytes)
1288 * Delete the old chain and duplicate it at the same (parent, index),
1289 * returning a new chain. This allows the old chain to still be
1290 * used by the flush code. Duplication occurs in-place.
1292 * The parent does not have to be locked for the delete/duplicate call,
1293 * but is in this particular code path.
1295 * NOTE: If we are not crossing a synchronization point the
1296 * duplication code will simply reuse the existing chain
1299 hammer2_chain_delete_duplicate(trans, &chain, 0);
1302 * Set MODIFIED and add a chain ref to prevent destruction. Both
1303 * modified flags share the same ref. (duplicated chains do not
1304 * start out MODIFIED unless possibly if the duplication code
1305 * decided to reuse the existing chain as-is).
1307 * If the chain is already marked MODIFIED then we can safely
1308 * return the previous allocation to the pool without having to
1309 * worry about snapshots. XXX check flush synchronization.
1311 if ((chain->flags & HAMMER2_CHAIN_MODIFIED) == 0) {
1312 atomic_set_int(&chain->flags, HAMMER2_CHAIN_MODIFIED);
1313 hammer2_chain_ref(chain);
1317 * Relocate the block, even if making it smaller (because different
1318 * block sizes may be in different regions).
1320 hammer2_freemap_alloc(trans, chain->hmp, &chain->bref, nbytes);
1321 chain->bytes = nbytes;
1322 /*ip->delta_dcount += (ssize_t)(nbytes - obytes);*/ /* XXX atomic */
1325 * The device buffer may be larger than the allocation size.
1327 bbytes = hammer2_devblksize(chain->bytes);
1328 pbase = chain->bref.data_off & ~(hammer2_off_t)(bbytes - 1);
1329 boff = chain->bref.data_off & HAMMER2_OFF_MASK & (bbytes - 1);
1332 * For now just support it on DATA chains (and not on indirect
1335 KKASSERT(chain->bp == NULL);
1338 * Make sure the chain is marked MOVED and SUBMOD is set in the
1339 * parent(s) so the adjustments are picked up by flush.
1341 if ((chain->flags & HAMMER2_CHAIN_MOVED) == 0) {
1342 hammer2_chain_ref(chain);
1343 atomic_set_int(&chain->flags, HAMMER2_CHAIN_MOVED);
1345 hammer2_chain_setsubmod(trans, chain);
1350 * Set a chain modified, making it read-write and duplicating it if necessary.
1351 * This function will assign a new physical block to the chain if necessary
1353 * Duplication of already-modified chains is possible when the modification
1354 * crosses a flush synchronization boundary.
1356 * Non-data blocks - The chain should be locked to at least the RESOLVE_MAYBE
1357 * level or the COW operation will not work.
1359 * Data blocks - The chain is usually locked RESOLVE_NEVER so as not to
1360 * run the data through the device buffers.
1362 * This function may return a different chain than was passed, in which case
1363 * the old chain will be unlocked and the new chain will be locked.
1365 * ip->chain may be adjusted by hammer2_chain_modify_ip().
1367 hammer2_inode_data_t *
1368 hammer2_chain_modify_ip(hammer2_trans_t *trans, hammer2_inode_t *ip,
1369 hammer2_chain_t **chainp, int flags)
1371 atomic_set_int(&ip->flags, HAMMER2_INODE_MODIFIED);
1372 hammer2_chain_modify(trans, chainp, flags);
1373 if (ip->chain != *chainp)
1374 hammer2_inode_repoint(ip, NULL, *chainp);
1375 return(&ip->chain->data->ipdata);
1379 hammer2_chain_modify(hammer2_trans_t *trans, hammer2_chain_t **chainp,
1382 hammer2_mount_t *hmp;
1383 hammer2_chain_t *chain;
1384 hammer2_off_t pbase;
1385 hammer2_off_t pmask;
1387 hammer2_tid_t flush_tid;
1399 * Data must be resolved if already assigned unless explicitly
1400 * flagged otherwise.
1402 if (chain->data == NULL && (flags & HAMMER2_MODIFY_OPTDATA) == 0 &&
1403 (chain->bref.data_off & ~HAMMER2_OFF_MASK_RADIX)) {
1404 hammer2_chain_lock(chain, HAMMER2_RESOLVE_ALWAYS);
1405 hammer2_chain_unlock(chain);
1409 * data is not optional for freemap chains (we must always be sure
1410 * to copy the data on COW storage allocations).
1412 if (chain->bref.type == HAMMER2_BREF_TYPE_FREEMAP_NODE ||
1413 chain->bref.type == HAMMER2_BREF_TYPE_FREEMAP_LEAF) {
1414 KKASSERT((chain->flags & HAMMER2_CHAIN_INITIAL) ||
1415 (flags & HAMMER2_MODIFY_OPTDATA) == 0);
1419 * If the chain is already marked MODIFIED we can usually just
1420 * return. However, if a modified chain is modified again in
1421 * a synchronization-point-crossing manner we have to issue a
1422 * delete/duplicate on the chain to avoid flush interference.
1424 if (chain->flags & HAMMER2_CHAIN_MODIFIED) {
1426 * Which flush_tid do we need to check? If the chain is
1427 * related to the freemap we have to use the freemap flush
1428 * tid (free_flush_tid), otherwise we use the normal filesystem
1429 * flush tid (topo_flush_tid). The two flush domains are
1430 * almost completely independent of each other.
1432 if (chain->bref.type == HAMMER2_BREF_TYPE_FREEMAP_NODE ||
1433 chain->bref.type == HAMMER2_BREF_TYPE_FREEMAP_LEAF) {
1434 flush_tid = hmp->topo_flush_tid; /* XXX */
1435 goto skipxx; /* XXX */
1437 flush_tid = hmp->topo_flush_tid;
1443 if (chain->modify_tid <= flush_tid &&
1444 trans->sync_tid > flush_tid) {
1446 * Modifications cross synchronization point,
1447 * requires delete-duplicate.
1449 KKASSERT((flags & HAMMER2_MODIFY_ASSERTNOCOPY) == 0);
1450 hammer2_chain_delete_duplicate(trans, chainp, 0);
1452 /* fall through using duplicate */
1456 * Quick return path, set DIRTYBP to ensure that
1457 * the later retirement of bp will write it out.
1459 * quick return path also needs the modify_tid
1463 atomic_set_int(&chain->flags, HAMMER2_CHAIN_DIRTYBP);
1464 if ((flags & HAMMER2_MODIFY_NO_MODIFY_TID) == 0)
1465 chain->bref.modify_tid = trans->sync_tid;
1466 chain->modify_tid = trans->sync_tid;
1471 * modify_tid is only update for primary modifications, not for
1472 * propagated brefs. mirror_tid will be updated regardless during
1473 * the flush, no need to set it here.
1475 if ((flags & HAMMER2_MODIFY_NO_MODIFY_TID) == 0)
1476 chain->bref.modify_tid = trans->sync_tid;
1479 * Set MODIFIED and add a chain ref to prevent destruction. Both
1480 * modified flags share the same ref.
1482 if ((chain->flags & HAMMER2_CHAIN_MODIFIED) == 0) {
1483 atomic_set_int(&chain->flags, HAMMER2_CHAIN_MODIFIED);
1484 hammer2_chain_ref(chain);
1488 * Adjust chain->modify_tid so the flusher knows when the
1489 * modification occurred.
1491 chain->modify_tid = trans->sync_tid;
1494 * The modification or re-modification requires an allocation and
1497 * We normally always allocate new storage here. If storage exists
1498 * and MODIFY_NOREALLOC is passed in, we do not allocate new storage.
1500 if (chain != &hmp->vchain &&
1501 chain != &hmp->fchain &&
1502 ((chain->bref.data_off & ~HAMMER2_OFF_MASK_RADIX) == 0 ||
1503 (flags & HAMMER2_MODIFY_NOREALLOC) == 0)
1505 hammer2_freemap_alloc(trans, chain->hmp,
1506 &chain->bref, chain->bytes);
1507 /* XXX failed allocation */
1511 * Do not COW if OPTDATA is set. INITIAL flag remains unchanged.
1512 * (OPTDATA does not prevent [re]allocation of storage, only the
1513 * related copy-on-write op).
1515 if (flags & HAMMER2_MODIFY_OPTDATA)
1519 * Clearing the INITIAL flag (for indirect blocks) indicates that
1520 * we've processed the uninitialized storage allocation.
1522 * If this flag is already clear we are likely in a copy-on-write
1523 * situation but we have to be sure NOT to bzero the storage if
1524 * no data is present.
1526 if (chain->flags & HAMMER2_CHAIN_INITIAL) {
1527 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
1535 * We currently should never instantiate a device buffer for a
1536 * file data chain. (We definitely can for a freemap chain).
1538 * XXX we can now do this
1540 KKASSERT(chain->bref.type != HAMMER2_BREF_TYPE_DATA);
1544 * Instantiate data buffer and possibly execute COW operation
1546 switch(chain->bref.type) {
1547 case HAMMER2_BREF_TYPE_VOLUME:
1548 case HAMMER2_BREF_TYPE_FREEMAP:
1549 case HAMMER2_BREF_TYPE_INODE:
1550 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
1552 * The data is embedded, no copy-on-write operation is
1555 KKASSERT(chain->bp == NULL);
1557 case HAMMER2_BREF_TYPE_DATA:
1558 case HAMMER2_BREF_TYPE_INDIRECT:
1559 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
1561 * Perform the copy-on-write operation
1563 KKASSERT(chain != &hmp->vchain && chain != &hmp->fchain);
1565 psize = hammer2_devblksize(chain->bytes);
1566 pmask = (hammer2_off_t)psize - 1;
1567 pbase = chain->bref.data_off & ~pmask;
1568 boff = chain->bref.data_off & (HAMMER2_OFF_MASK & pmask);
1569 KKASSERT(pbase != 0);
1570 peof = (pbase + HAMMER2_SEGMASK64) & ~HAMMER2_SEGMASK64;
1573 * The getblk() optimization can only be used if the
1574 * chain element size matches the physical block size.
1576 if (chain->bp && chain->bp->b_loffset == pbase) {
1579 } else if (chain->bytes == psize) {
1580 nbp = getblk(hmp->devvp, pbase, psize, 0, 0);
1582 } else if (hammer2_isclusterable(chain)) {
1583 error = cluster_read(hmp->devvp, peof, pbase, psize,
1584 psize, HAMMER2_PBUFSIZE*4,
1586 adjreadcounter(&chain->bref, chain->bytes);
1588 error = bread(hmp->devvp, pbase, psize, &nbp);
1589 adjreadcounter(&chain->bref, chain->bytes);
1591 KKASSERT(error == 0);
1592 bdata = (char *)nbp->b_data + boff;
1595 * Copy or zero-fill on write depending on whether
1596 * chain->data exists or not. Retire the existing bp
1597 * based on the DIRTYBP flag. Set the DIRTYBP flag to
1598 * indicate that retirement of nbp should use bdwrite().
1601 KKASSERT(chain->bp != NULL);
1602 if (chain->data != bdata) {
1603 bcopy(chain->data, bdata, chain->bytes);
1605 } else if (wasinitial) {
1606 bzero(bdata, chain->bytes);
1609 * We have a problem. We were asked to COW but
1610 * we don't have any data to COW with!
1612 panic("hammer2_chain_modify: having a COW %p\n",
1615 if (chain->bp != nbp) {
1617 if (chain->flags & HAMMER2_CHAIN_DIRTYBP) {
1618 chain->bp->b_flags |= B_CLUSTEROK;
1621 chain->bp->b_flags |= B_RELBUF;
1626 BUF_KERNPROC(chain->bp);
1628 chain->data = bdata;
1629 atomic_set_int(&chain->flags, HAMMER2_CHAIN_DIRTYBP);
1632 panic("hammer2_chain_modify: illegal non-embedded type %d",
1638 hammer2_chain_setsubmod(trans, chain);
1642 * Mark the volume as having been modified. This short-cut version
1643 * does not have to lock the volume's chain, which allows the ioctl
1644 * code to make adjustments to connections without deadlocking. XXX
1646 * No ref is made on vchain when flagging it MODIFIED.
1649 hammer2_modify_volume(hammer2_mount_t *hmp)
1651 hammer2_voldata_lock(hmp);
1652 hammer2_voldata_unlock(hmp, 1);
1656 * This function returns the chain at the nearest key within the specified
1657 * range with the highest delete_tid. The core spinlock must be held on
1658 * call and the returned chain will be referenced but not locked.
1660 * The returned chain may or may not be in a deleted state. Note that
1661 * live chains have a delete_tid = MAX_TID.
1663 * This function will recurse through chain->rbtree as necessary and will
1664 * return a *key_nextp suitable for iteration. *key_nextp is only set if
1665 * the iteration value is less than the current value of *key_nextp.
1667 * The caller should use (*key_nextp) to calculate the actual range of
1668 * the returned element, which will be (key_beg to *key_nextp - 1).
1670 * (*key_nextp) can be passed as key_beg in an iteration only while non-NULL
1671 * chains continue to be returned. On EOF (*key_nextp) may overflow since
1672 * it will wind up being (key_end + 1).
1674 struct hammer2_chain_find_info {
1675 hammer2_chain_t *best;
1676 hammer2_key_t key_beg;
1677 hammer2_key_t key_end;
1678 hammer2_key_t key_next;
1681 static int hammer2_chain_find_cmp(hammer2_chain_t *child, void *data);
1682 static int hammer2_chain_find_callback(hammer2_chain_t *child, void *data);
1686 hammer2_chain_find(hammer2_chain_t *parent, hammer2_key_t *key_nextp,
1687 hammer2_key_t key_beg, hammer2_key_t key_end)
1689 struct hammer2_chain_find_info info;
1690 hammer2_chain_layer_t *layer;
1693 info.key_beg = key_beg;
1694 info.key_end = key_end;
1695 info.key_next = *key_nextp;
1697 KKASSERT(parent->core->good == 0x1234);
1698 TAILQ_FOREACH(layer, &parent->core->layerq, entry) {
1699 KKASSERT(layer->good == 0xABCD);
1700 RB_SCAN(hammer2_chain_tree, &layer->rbtree,
1701 hammer2_chain_find_cmp, hammer2_chain_find_callback,
1704 *key_nextp = info.key_next;
1706 kprintf("chain_find %p %016jx:%016jx next=%016jx\n",
1707 parent, key_beg, key_end, *key_nextp);
1715 hammer2_chain_find_cmp(hammer2_chain_t *child, void *data)
1717 struct hammer2_chain_find_info *info = data;
1718 hammer2_key_t child_beg;
1719 hammer2_key_t child_end;
1721 child_beg = child->bref.key;
1722 child_end = child_beg + ((hammer2_key_t)1 << child->bref.keybits) - 1;
1724 if (child_end < info->key_beg)
1726 if (child_beg > info->key_end)
1733 hammer2_chain_find_callback(hammer2_chain_t *child, void *data)
1735 struct hammer2_chain_find_info *info = data;
1736 hammer2_chain_t *best;
1737 hammer2_key_t child_end;
1741 * Skip deleted chains which have been flushed (MOVED no longer set),
1742 * causes caller to check blockref array.
1744 if ((child->flags & (HAMMER2_CHAIN_DELETED | HAMMER2_CHAIN_MOVED)) ==
1745 HAMMER2_CHAIN_DELETED) {
1754 if ((best = info->best) == NULL) {
1756 * No previous best. Assign best
1759 } else if (best->bref.key <= info->key_beg &&
1760 child->bref.key <= info->key_beg) {
1762 * If our current best is flush with key_beg and child is
1763 * also flush with key_beg choose based on delete_tid.
1765 if (child->delete_tid > best->delete_tid) {
1768 } else if (child->bref.key < best->bref.key) {
1770 * Child has a nearer key and best is not flush with key_beg.
1771 * Truncate key_next to the old best key.
1774 if (info->key_next > best->bref.key || info->key_next == 0)
1775 info->key_next = best->bref.key;
1778 * Keep the current best but truncate key_next based on
1779 * child (occurs automatically).
1784 * Always truncate key_next based on child's end-of-range.
1786 child_end = child->bref.key + ((hammer2_key_t)1 << child->bref.keybits);
1787 if (child_end && (info->key_next > child_end || info->key_next == 0))
1788 info->key_next = child_end;
1794 * Retrieve the specified chain from a media blockref, creating the
1795 * in-memory chain structure and setting HAMMER2_CHAIN_REPLACE to
1796 * indicate that modifications must replace an existing bref in the
1799 * NULL is returned if the insertion races.
1801 * Caller must hold the parent locked shared or exclusive since we may
1802 * need the parent's bref array to find our block.
1805 hammer2_chain_get(hammer2_chain_t *parent, hammer2_blockref_t *bref)
1807 hammer2_mount_t *hmp = parent->hmp;
1808 hammer2_chain_core_t *above = parent->core;
1809 hammer2_chain_t *chain;
1812 * Allocate a chain structure representing the existing media
1813 * entry. Resulting chain has one ref and is not locked.
1815 chain = hammer2_chain_alloc(hmp, parent->pmp, NULL, bref);
1816 hammer2_chain_core_alloc(NULL, chain, NULL);
1817 atomic_set_int(&chain->flags, HAMMER2_CHAIN_REPLACE);
1818 /* ref'd chain returned */
1821 * Link the chain into its parent. A spinlock is required to safely
1822 * access the RBTREE, and it is possible to collide with another
1823 * hammer2_chain_get() operation because the caller might only hold
1824 * a shared lock on the parent.
1826 KKASSERT(parent->refs > 0);
1827 hammer2_chain_insert(above, chain, HAMMER2_CHAIN_INSERT_SPIN |
1828 HAMMER2_CHAIN_INSERT_RACE);
1829 if ((chain->flags & HAMMER2_CHAIN_ONRBTREE) == 0) {
1830 kprintf("chain %p not on RBTREE\n", chain);
1831 hammer2_chain_drop(chain);
1836 * Return our new chain referenced but not locked.
1842 * Lookup initialization/completion API
1845 hammer2_chain_lookup_init(hammer2_chain_t *parent, int flags)
1847 if (flags & HAMMER2_LOOKUP_SHARED) {
1848 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS |
1849 HAMMER2_RESOLVE_SHARED);
1851 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
1857 hammer2_chain_lookup_done(hammer2_chain_t *parent)
1860 hammer2_chain_unlock(parent);
1865 hammer2_chain_getparent(hammer2_chain_t **parentp, int how)
1867 hammer2_chain_t *oparent;
1868 hammer2_chain_t *bparent;
1869 hammer2_chain_t *nparent;
1870 hammer2_chain_core_t *above;
1873 above = oparent->above;
1875 spin_lock(&above->cst.spin);
1876 bparent = TAILQ_FIRST(&above->ownerq);
1877 hammer2_chain_ref(bparent);
1881 while (nparent->flags & HAMMER2_CHAIN_DUPLICATED)
1882 nparent = TAILQ_NEXT(nparent, core_entry);
1883 hammer2_chain_ref(nparent);
1884 spin_unlock(&above->cst.spin);
1887 * Be careful of order
1889 hammer2_chain_unlock(oparent);
1890 hammer2_chain_lock(nparent, how | HAMMER2_RESOLVE_NOREF);
1891 hammer2_chain_drop(bparent);
1894 * We might have raced a delete-duplicate.
1896 if (nparent->flags & HAMMER2_CHAIN_DUPLICATED) {
1897 spin_lock(&above->cst.spin);
1898 if (nparent->flags & HAMMER2_CHAIN_DUPLICATED) {
1899 spin_unlock(&above->cst.spin);
1900 hammer2_chain_ref(nparent);
1901 hammer2_chain_unlock(nparent);
1903 spin_lock(&above->cst.spin);
1904 continue; /* retry */
1906 spin_unlock(&above->cst.spin);
1916 * Locate the first chain whos key range overlaps (key_beg, key_end) inclusive.
1917 * (*parentp) typically points to an inode but can also point to a related
1918 * indirect block and this function will recurse upwards and find the inode
1921 * (*parentp) must be exclusively locked and referenced and can be an inode
1922 * or an existing indirect block within the inode.
1924 * On return (*parentp) will be modified to point at the deepest parent chain
1925 * element encountered during the search, as a helper for an insertion or
1926 * deletion. The new (*parentp) will be locked and referenced and the old
1927 * will be unlocked and dereferenced (no change if they are both the same).
1929 * The matching chain will be returned exclusively locked. If NOLOCK is
1930 * requested the chain will be returned only referenced.
1932 * NULL is returned if no match was found, but (*parentp) will still
1933 * potentially be adjusted.
1935 * On return (*key_nextp) will point to an iterative value for key_beg.
1936 * (If NULL is returned (*key_nextp) is set to key_end).
1938 * This function will also recurse up the chain if the key is not within the
1939 * current parent's range. (*parentp) can never be set to NULL. An iteration
1940 * can simply allow (*parentp) to float inside the loop.
1942 * NOTE! chain->data is not always resolved. By default it will not be
1943 * resolved for BREF_TYPE_DATA, FREEMAP_NODE, or FREEMAP_LEAF. Use
1944 * HAMMER2_LOOKUP_ALWAYS to force resolution (but be careful w/
1945 * BREF_TYPE_DATA as the device buffer can alias the logical file
1949 hammer2_chain_lookup(hammer2_chain_t **parentp, hammer2_key_t *key_nextp,
1950 hammer2_key_t key_beg, hammer2_key_t key_end,
1951 int *cache_indexp, int flags)
1953 hammer2_mount_t *hmp;
1954 hammer2_chain_t *parent;
1955 hammer2_chain_t *chain;
1956 hammer2_blockref_t *base;
1957 hammer2_blockref_t *bref;
1958 hammer2_blockref_t bcopy;
1959 hammer2_key_t scan_beg;
1960 hammer2_key_t scan_end;
1961 hammer2_chain_core_t *above;
1963 int how_always = HAMMER2_RESOLVE_ALWAYS;
1964 int how_maybe = HAMMER2_RESOLVE_MAYBE;
1967 if (flags & HAMMER2_LOOKUP_ALWAYS) {
1968 how_maybe = how_always;
1969 how = HAMMER2_RESOLVE_ALWAYS;
1970 } else if (flags & (HAMMER2_LOOKUP_NODATA | HAMMER2_LOOKUP_NOLOCK)) {
1971 how = HAMMER2_RESOLVE_NEVER;
1973 how = HAMMER2_RESOLVE_MAYBE;
1975 if (flags & (HAMMER2_LOOKUP_SHARED | HAMMER2_LOOKUP_NOLOCK)) {
1976 how_maybe |= HAMMER2_RESOLVE_SHARED;
1977 how_always |= HAMMER2_RESOLVE_SHARED;
1978 how |= HAMMER2_RESOLVE_SHARED;
1982 * Recurse (*parentp) upward if necessary until the parent completely
1983 * encloses the key range or we hit the inode.
1985 * This function handles races against the flusher doing a delete-
1986 * duplicate above us and re-homes the parent to the duplicate in
1987 * that case, otherwise we'd wind up recursing down a stale chain.
1992 while (parent->bref.type == HAMMER2_BREF_TYPE_INDIRECT ||
1993 parent->bref.type == HAMMER2_BREF_TYPE_FREEMAP_NODE) {
1994 scan_beg = parent->bref.key;
1995 scan_end = scan_beg +
1996 ((hammer2_key_t)1 << parent->bref.keybits) - 1;
1997 if (key_beg >= scan_beg && key_end <= scan_end)
1999 parent = hammer2_chain_getparent(parentp, how_maybe);
2004 * Locate the blockref array. Currently we do a fully associative
2005 * search through the array.
2007 switch(parent->bref.type) {
2008 case HAMMER2_BREF_TYPE_INODE:
2010 * Special shortcut for embedded data returns the inode
2011 * itself. Callers must detect this condition and access
2012 * the embedded data (the strategy code does this for us).
2014 * This is only applicable to regular files and softlinks.
2016 if (parent->data->ipdata.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2017 if (flags & HAMMER2_LOOKUP_NOLOCK)
2018 hammer2_chain_ref(parent);
2020 hammer2_chain_lock(parent, how_always);
2021 *key_nextp = key_end + 1;
2024 base = &parent->data->ipdata.u.blockset.blockref[0];
2025 count = HAMMER2_SET_COUNT;
2027 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2028 case HAMMER2_BREF_TYPE_INDIRECT:
2030 * Handle MATCHIND on the parent
2032 if (flags & HAMMER2_LOOKUP_MATCHIND) {
2033 scan_beg = parent->bref.key;
2034 scan_end = scan_beg +
2035 ((hammer2_key_t)1 << parent->bref.keybits) - 1;
2036 if (key_beg == scan_beg && key_end == scan_end) {
2038 hammer2_chain_lock(chain, how_maybe);
2039 *key_nextp = scan_end + 1;
2044 * Optimize indirect blocks in the INITIAL state to avoid
2047 if (parent->flags & HAMMER2_CHAIN_INITIAL) {
2050 if (parent->data == NULL)
2051 panic("parent->data is NULL");
2052 base = &parent->data->npdata[0];
2054 count = parent->bytes / sizeof(hammer2_blockref_t);
2056 case HAMMER2_BREF_TYPE_VOLUME:
2057 base = &hmp->voldata.sroot_blockset.blockref[0];
2058 count = HAMMER2_SET_COUNT;
2060 case HAMMER2_BREF_TYPE_FREEMAP:
2061 base = &hmp->voldata.freemap_blockset.blockref[0];
2062 count = HAMMER2_SET_COUNT;
2065 panic("hammer2_chain_lookup: unrecognized blockref type: %d",
2067 base = NULL; /* safety */
2068 count = 0; /* safety */
2072 * Merged scan to find next candidate.
2074 * hammer2_base_*() functions require the above->live_* fields
2075 * to be synchronized.
2077 * We need to hold the spinlock to access the block array and RB tree
2078 * and to interlock chain creation.
2080 above = parent->core;
2081 if ((parent->flags & HAMMER2_CHAIN_COUNTEDBREFS) == 0)
2082 hammer2_chain_countbrefs(parent, base, count);
2087 spin_lock(&above->cst.spin);
2088 chain = hammer2_combined_find(parent, base, count,
2089 cache_indexp, key_nextp,
2090 key_beg, key_end, &bref);
2093 * Exhausted parent chain, iterate.
2096 spin_unlock(&above->cst.spin);
2097 if (key_beg == key_end) /* short cut single-key case */
2099 return (hammer2_chain_next(parentp, NULL, key_nextp,
2101 cache_indexp, flags));
2105 * Selected from blockref or in-memory chain.
2107 if (chain == NULL) {
2109 spin_unlock(&above->cst.spin);
2110 chain = hammer2_chain_get(parent, &bcopy);
2111 if (chain == NULL) {
2112 kprintf("retry lookup parent %p keys %016jx:%016jx\n",
2113 parent, key_beg, key_end);
2116 if (bcmp(&bcopy, bref, sizeof(bcopy))) {
2117 hammer2_chain_drop(chain);
2121 hammer2_chain_ref(chain);
2122 spin_unlock(&above->cst.spin);
2124 /* chain is referenced but not locked */
2127 * Skip deleted chains (XXX cache 'i' end-of-block-array? XXX)
2129 * NOTE: chain's key range is not relevant as there might be
2130 * one-offs within the range that are not deleted.
2132 if (chain->flags & HAMMER2_CHAIN_DELETED) {
2133 hammer2_chain_drop(chain);
2134 key_beg = *key_nextp;
2135 if (key_beg == 0 || key_beg > key_end)
2141 * If the chain element is an indirect block it becomes the new
2142 * parent and we loop on it. We must maintain our top-down locks
2143 * to prevent the flusher from interfering (i.e. doing a
2144 * delete-duplicate and leaving us recursing down a deleted chain).
2146 * The parent always has to be locked with at least RESOLVE_MAYBE
2147 * so we can access its data. It might need a fixup if the caller
2148 * passed incompatible flags. Be careful not to cause a deadlock
2149 * as a data-load requires an exclusive lock.
2151 * If HAMMER2_LOOKUP_MATCHIND is set and the indirect block's key
2152 * range is within the requested key range we return the indirect
2153 * block and do NOT loop. This is usually only used to acquire
2156 if (chain->bref.type == HAMMER2_BREF_TYPE_INDIRECT ||
2157 chain->bref.type == HAMMER2_BREF_TYPE_FREEMAP_NODE) {
2158 hammer2_chain_lock(chain, how_maybe | HAMMER2_RESOLVE_NOREF);
2159 hammer2_chain_unlock(parent);
2160 *parentp = parent = chain;
2164 hammer2_chain_lock(chain, how | HAMMER2_RESOLVE_NOREF);
2167 * All done, return the chain
2173 * After having issued a lookup we can iterate all matching keys.
2175 * If chain is non-NULL we continue the iteration from just after it's index.
2177 * If chain is NULL we assume the parent was exhausted and continue the
2178 * iteration at the next parent.
2180 * parent must be locked on entry and remains locked throughout. chain's
2181 * lock status must match flags. Chain is always at least referenced.
2183 * WARNING! The MATCHIND flag does not apply to this function.
2186 hammer2_chain_next(hammer2_chain_t **parentp, hammer2_chain_t *chain,
2187 hammer2_key_t *key_nextp,
2188 hammer2_key_t key_beg, hammer2_key_t key_end,
2189 int *cache_indexp, int flags)
2191 hammer2_chain_t *parent;
2195 * Calculate locking flags for upward recursion.
2197 how_maybe = HAMMER2_RESOLVE_MAYBE;
2198 if (flags & (HAMMER2_LOOKUP_SHARED | HAMMER2_LOOKUP_NOLOCK))
2199 how_maybe |= HAMMER2_RESOLVE_SHARED;
2204 * Calculate the next index and recalculate the parent if necessary.
2207 key_beg = chain->bref.key +
2208 ((hammer2_key_t)1 << chain->bref.keybits);
2209 if (flags & HAMMER2_LOOKUP_NOLOCK)
2210 hammer2_chain_drop(chain);
2212 hammer2_chain_unlock(chain);
2215 * Any scan where the lookup returned degenerate data embedded
2216 * in the inode has an invalid index and must terminate.
2218 if (chain == parent)
2220 if (key_beg == 0 || key_beg > key_end)
2223 } else if (parent->bref.type != HAMMER2_BREF_TYPE_INDIRECT &&
2224 parent->bref.type != HAMMER2_BREF_TYPE_FREEMAP_NODE) {
2226 * We reached the end of the iteration.
2231 * Continue iteration with next parent unless the current
2232 * parent covers the range.
2234 key_beg = parent->bref.key +
2235 ((hammer2_key_t)1 << parent->bref.keybits);
2236 if (key_beg == 0 || key_beg > key_end)
2238 parent = hammer2_chain_getparent(parentp, how_maybe);
2244 return (hammer2_chain_lookup(parentp, key_nextp,
2246 cache_indexp, flags));
2250 * Create and return a new hammer2 system memory structure of the specified
2251 * key, type and size and insert it under (*parentp). This is a full
2252 * insertion, based on the supplied key/keybits, and may involve creating
2253 * indirect blocks and moving other chains around via delete/duplicate.
2255 * (*parentp) must be exclusive locked and may be replaced on return
2256 * depending on how much work the function had to do.
2258 * (*chainp) usually starts out NULL and returns the newly created chain,
2259 * but if the caller desires the caller may allocate a disconnected chain
2260 * and pass it in instead. (It is also possible for the caller to use
2261 * chain_duplicate() to create a disconnected chain, manipulate it, then
2262 * pass it into this function to insert it).
2264 * This function should NOT be used to insert INDIRECT blocks. It is
2265 * typically used to create/insert inodes and data blocks.
2267 * Caller must pass-in an exclusively locked parent the new chain is to
2268 * be inserted under, and optionally pass-in a disconnected, exclusively
2269 * locked chain to insert (else we create a new chain). The function will
2270 * adjust (*parentp) as necessary, create or connect the chain, and
2271 * return an exclusively locked chain in *chainp.
2274 hammer2_chain_create(hammer2_trans_t *trans, hammer2_chain_t **parentp,
2275 hammer2_chain_t **chainp,
2276 hammer2_key_t key, int keybits, int type, size_t bytes)
2278 hammer2_mount_t *hmp;
2279 hammer2_chain_t *chain;
2280 hammer2_chain_t *parent = *parentp;
2281 hammer2_chain_core_t *above;
2282 hammer2_blockref_t *base;
2283 hammer2_blockref_t dummy;
2288 above = parent->core;
2289 KKASSERT(ccms_thread_lock_owned(&above->cst));
2293 if (chain == NULL) {
2295 * First allocate media space and construct the dummy bref,
2296 * then allocate the in-memory chain structure. Set the
2297 * INITIAL flag for fresh chains.
2299 bzero(&dummy, sizeof(dummy));
2302 dummy.keybits = keybits;
2303 dummy.data_off = hammer2_getradix(bytes);
2304 dummy.methods = parent->bref.methods;
2305 chain = hammer2_chain_alloc(hmp, parent->pmp, trans, &dummy);
2306 hammer2_chain_core_alloc(trans, chain, NULL);
2308 atomic_set_int(&chain->flags, HAMMER2_CHAIN_INITIAL);
2311 * Lock the chain manually, chain_lock will load the chain
2312 * which we do NOT want to do. (note: chain->refs is set
2313 * to 1 by chain_alloc() for us, but lockcnt is not).
2316 ccms_thread_lock(&chain->core->cst, CCMS_STATE_EXCLUSIVE);
2320 * We do NOT set INITIAL here (yet). INITIAL is only
2321 * used for indirect blocks.
2323 * Recalculate bytes to reflect the actual media block
2326 bytes = (hammer2_off_t)1 <<
2327 (int)(chain->bref.data_off & HAMMER2_OFF_MASK_RADIX);
2328 chain->bytes = bytes;
2331 case HAMMER2_BREF_TYPE_VOLUME:
2332 case HAMMER2_BREF_TYPE_FREEMAP:
2333 panic("hammer2_chain_create: called with volume type");
2335 case HAMMER2_BREF_TYPE_INODE:
2336 KKASSERT(bytes == HAMMER2_INODE_BYTES);
2337 atomic_set_int(&chain->flags, HAMMER2_CHAIN_EMBEDDED);
2338 chain->data = kmalloc(sizeof(chain->data->ipdata),
2339 hmp->mchain, M_WAITOK | M_ZERO);
2341 case HAMMER2_BREF_TYPE_INDIRECT:
2342 panic("hammer2_chain_create: cannot be used to"
2343 "create indirect block");
2345 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2346 panic("hammer2_chain_create: cannot be used to"
2347 "create freemap root or node");
2349 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2350 KKASSERT(bytes == sizeof(chain->data->bmdata));
2351 atomic_set_int(&chain->flags, HAMMER2_CHAIN_EMBEDDED);
2352 chain->data = kmalloc(sizeof(chain->data->bmdata),
2353 hmp->mchain, M_WAITOK | M_ZERO);
2355 case HAMMER2_BREF_TYPE_DATA:
2357 /* leave chain->data NULL */
2358 KKASSERT(chain->data == NULL);
2363 * Potentially update the existing chain's key/keybits.
2365 * Do NOT mess with the current state of the INITIAL flag.
2367 chain->bref.key = key;
2368 chain->bref.keybits = keybits;
2369 KKASSERT(chain->above == NULL);
2373 * Calculate how many entries we have in the blockref array and
2374 * determine if an indirect block is required.
2377 above = parent->core;
2379 switch(parent->bref.type) {
2380 case HAMMER2_BREF_TYPE_INODE:
2381 KKASSERT((parent->data->ipdata.op_flags &
2382 HAMMER2_OPFLAG_DIRECTDATA) == 0);
2383 KKASSERT(parent->data != NULL);
2384 base = &parent->data->ipdata.u.blockset.blockref[0];
2385 count = HAMMER2_SET_COUNT;
2387 case HAMMER2_BREF_TYPE_INDIRECT:
2388 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2389 if (parent->flags & HAMMER2_CHAIN_INITIAL)
2392 base = &parent->data->npdata[0];
2393 count = parent->bytes / sizeof(hammer2_blockref_t);
2395 case HAMMER2_BREF_TYPE_VOLUME:
2396 KKASSERT(parent->data != NULL);
2397 base = &hmp->voldata.sroot_blockset.blockref[0];
2398 count = HAMMER2_SET_COUNT;
2400 case HAMMER2_BREF_TYPE_FREEMAP:
2401 KKASSERT(parent->data != NULL);
2402 base = &hmp->voldata.freemap_blockset.blockref[0];
2403 count = HAMMER2_SET_COUNT;
2406 panic("hammer2_chain_create: unrecognized blockref type: %d",
2414 * Make sure we've counted the brefs
2416 if ((parent->flags & HAMMER2_CHAIN_COUNTEDBREFS) == 0)
2417 hammer2_chain_countbrefs(parent, base, count);
2419 KKASSERT(above->live_count >= 0 && above->live_count <= count);
2422 * If no free blockref could be found we must create an indirect
2423 * block and move a number of blockrefs into it. With the parent
2424 * locked we can safely lock each child in order to delete+duplicate
2425 * it without causing a deadlock.
2427 * This may return the new indirect block or the old parent depending
2428 * on where the key falls. NULL is returned on error.
2430 if (above->live_count == count) {
2431 hammer2_chain_t *nparent;
2433 nparent = hammer2_chain_create_indirect(trans, parent,
2436 if (nparent == NULL) {
2438 hammer2_chain_drop(chain);
2442 if (parent != nparent) {
2443 hammer2_chain_unlock(parent);
2444 parent = *parentp = nparent;
2450 * Link the chain into its parent. Later on we will have to set
2451 * the MOVED bit in situations where we don't mark the new chain
2452 * as being modified.
2454 if (chain->above != NULL)
2455 panic("hammer2: hammer2_chain_create: chain already connected");
2456 KKASSERT(chain->above == NULL);
2457 KKASSERT((chain->flags & HAMMER2_CHAIN_DELETED) == 0);
2458 hammer2_chain_insert(above, chain, HAMMER2_CHAIN_INSERT_SPIN |
2459 HAMMER2_CHAIN_INSERT_LIVE);
2463 * Mark the newly created chain modified.
2465 * Device buffers are not instantiated for DATA elements
2466 * as these are handled by logical buffers.
2468 * Indirect and freemap node indirect blocks are handled
2469 * by hammer2_chain_create_indirect() and not by this
2472 * Data for all other bref types is expected to be
2473 * instantiated (INODE, LEAF).
2475 switch(chain->bref.type) {
2476 case HAMMER2_BREF_TYPE_DATA:
2477 hammer2_chain_modify(trans, &chain,
2478 HAMMER2_MODIFY_OPTDATA |
2479 HAMMER2_MODIFY_ASSERTNOCOPY);
2481 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2482 case HAMMER2_BREF_TYPE_INODE:
2483 hammer2_chain_modify(trans, &chain,
2484 HAMMER2_MODIFY_ASSERTNOCOPY);
2488 * Remaining types are not supported by this function.
2489 * In particular, INDIRECT and LEAF_NODE types are
2490 * handled by create_indirect().
2492 panic("hammer2_chain_create: bad type: %d",
2499 * When reconnecting a chain we must set MOVED and setsubmod
2500 * so the flush recognizes that it must update the bref in
2503 if ((chain->flags & HAMMER2_CHAIN_MOVED) == 0) {
2504 hammer2_chain_ref(chain);
2505 atomic_set_int(&chain->flags, HAMMER2_CHAIN_MOVED);
2507 hammer2_chain_setsubmod(trans, chain);
2517 * Replace (*chainp) with a duplicate. The original *chainp is unlocked
2518 * and the replacement will be returned locked. Both the original and the
2519 * new chain will share the same RBTREE (have the same chain->core), with
2520 * the new chain becoming the 'current' chain (meaning it is the first in
2521 * the linked list at core->chain_first).
2523 * If (parent) is non-NULL then the new duplicated chain is inserted under
2526 * If (parent) is NULL then the new duplicated chain is not inserted anywhere,
2527 * similar to if it had just been chain_alloc()'d (suitable for passing into
2528 * hammer2_chain_create() after this function returns).
2530 * NOTE! Duplication is used in order to retain the original topology to
2531 * support flush synchronization points. Both the original and the
2532 * new chain will have the same transaction id and thus the operation
2533 * appears atomic w/regards to media flushes.
2535 static void hammer2_chain_dup_fixup(hammer2_chain_t *ochain,
2536 hammer2_chain_t *nchain);
2539 hammer2_chain_duplicate(hammer2_trans_t *trans, hammer2_chain_t *parent,
2540 hammer2_chain_t **chainp, hammer2_blockref_t *bref,
2543 hammer2_mount_t *hmp;
2544 hammer2_blockref_t *base;
2545 hammer2_chain_t *ochain;
2546 hammer2_chain_t *nchain;
2547 hammer2_chain_core_t *above;
2554 * First create a duplicate of the chain structure, associating
2555 * it with the same core, making it the same size, pointing it
2556 * to the same bref (the same media block).
2561 bref = &ochain->bref;
2563 nchain = hammer2_chain_alloc(hmp, NULL, trans, bref);
2564 atomic_set_int(&nchain->flags, HAMMER2_CHAIN_SNAPSHOT);
2566 nchain = hammer2_chain_alloc(hmp, ochain->pmp, trans, bref);
2568 hammer2_chain_core_alloc(trans, nchain, ochain);
2569 bytes = (hammer2_off_t)1 <<
2570 (int)(bref->data_off & HAMMER2_OFF_MASK_RADIX);
2571 nchain->bytes = bytes;
2572 nchain->modify_tid = ochain->modify_tid;
2574 hammer2_chain_lock(nchain, HAMMER2_RESOLVE_NEVER |
2575 HAMMER2_RESOLVE_NOREF);
2576 hammer2_chain_dup_fixup(ochain, nchain);
2577 /* nchain has 1 ref */
2580 * If parent is not NULL, insert the duplicated chain into the
2581 * parent. The newly duplicated chain must be marked MOVED and
2582 * SUBMODIFIED set in its parent(s).
2584 * Having both chains locked is extremely important for atomicy.
2588 * Locate a free blockref in the parent's array
2590 above = parent->core;
2591 KKASSERT(ccms_thread_lock_owned(&above->cst));
2593 switch(parent->bref.type) {
2594 case HAMMER2_BREF_TYPE_INODE:
2595 KKASSERT((parent->data->ipdata.op_flags &
2596 HAMMER2_OPFLAG_DIRECTDATA) == 0);
2597 KKASSERT(parent->data != NULL);
2598 base = &parent->data->ipdata.u.blockset.blockref[0];
2599 count = HAMMER2_SET_COUNT;
2601 case HAMMER2_BREF_TYPE_INDIRECT:
2602 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2603 if (parent->flags & HAMMER2_CHAIN_INITIAL) {
2606 KKASSERT(parent->data != NULL);
2607 base = &parent->data->npdata[0];
2609 count = parent->bytes / sizeof(hammer2_blockref_t);
2611 case HAMMER2_BREF_TYPE_VOLUME:
2612 KKASSERT(parent->data != NULL);
2613 base = &hmp->voldata.sroot_blockset.blockref[0];
2614 count = HAMMER2_SET_COUNT;
2616 case HAMMER2_BREF_TYPE_FREEMAP:
2617 KKASSERT(parent->data != NULL);
2618 base = &hmp->voldata.freemap_blockset.blockref[0];
2619 count = HAMMER2_SET_COUNT;
2622 panic("hammer2_chain_create: unrecognized "
2623 "blockref type: %d",
2629 KKASSERT((nchain->flags & HAMMER2_CHAIN_DELETED) == 0);
2630 KKASSERT(parent->refs > 0);
2631 hammer2_chain_insert(above, nchain, HAMMER2_CHAIN_INSERT_SPIN |
2632 HAMMER2_CHAIN_INSERT_LIVE);
2634 if ((nchain->flags & HAMMER2_CHAIN_MOVED) == 0) {
2635 hammer2_chain_ref(nchain);
2636 atomic_set_int(&nchain->flags, HAMMER2_CHAIN_MOVED);
2638 hammer2_chain_setsubmod(trans, nchain);
2642 * We have to unlock ochain to flush any dirty data, asserting the
2643 * case (data == NULL) to catch any extra locks that might have been
2644 * present, then transfer state to nchain.
2646 oflags = ochain->flags;
2647 odata = ochain->data;
2648 hammer2_chain_unlock(ochain);
2649 KKASSERT((ochain->flags & HAMMER2_CHAIN_EMBEDDED) ||
2650 ochain->data == NULL);
2652 if (oflags & HAMMER2_CHAIN_INITIAL)
2653 atomic_set_int(&nchain->flags, HAMMER2_CHAIN_INITIAL);
2656 * WARNING! We should never resolve DATA to device buffers
2657 * (XXX allow it if the caller did?), and since
2658 * we currently do not have the logical buffer cache
2659 * buffer in-hand to fix its cached physical offset
2660 * we also force the modify code to not COW it. XXX
2662 * WARNING! nchain should have only one manual ref plus additional
2663 * refs related to flags or the hammer2_chain_modify()
2664 * replacement could leave a ref hanging.
2666 if (oflags & HAMMER2_CHAIN_MODIFIED) {
2667 if (nchain->bref.type == HAMMER2_BREF_TYPE_DATA) {
2668 hammer2_chain_modify(trans, &nchain,
2669 HAMMER2_MODIFY_OPTDATA |
2670 HAMMER2_MODIFY_NOREALLOC |
2671 HAMMER2_MODIFY_ASSERTNOCOPY);
2672 } else if (oflags & HAMMER2_CHAIN_INITIAL) {
2673 hammer2_chain_modify(trans, &nchain,
2674 HAMMER2_MODIFY_OPTDATA |
2675 HAMMER2_MODIFY_ASSERTNOCOPY);
2677 hammer2_chain_modify(trans, &nchain,
2678 HAMMER2_MODIFY_ASSERTNOCOPY);
2681 if (nchain->bref.type == HAMMER2_BREF_TYPE_DATA) {
2683 } else if (oflags & HAMMER2_CHAIN_INITIAL) {
2686 hammer2_chain_lock(nchain, HAMMER2_RESOLVE_ALWAYS);
2687 hammer2_chain_unlock(nchain);
2690 atomic_set_int(&nchain->flags, HAMMER2_CHAIN_SUBMODIFIED);
2695 * Special in-place delete-duplicate sequence which does not require a
2696 * locked parent. (*chainp) is marked DELETED and atomically replaced
2697 * with a duplicate. Atomicy is at the very-fine spin-lock level in
2698 * order to ensure that lookups do not race us.
2700 * If the input chain is already marked deleted the duplicated chain will
2701 * also be marked deleted. This case can occur when an inode is removed
2702 * from the filesystem but programs still have an open descriptor to it.
2705 hammer2_chain_delete_duplicate(hammer2_trans_t *trans, hammer2_chain_t **chainp,
2708 hammer2_mount_t *hmp;
2709 hammer2_chain_t *ochain;
2710 hammer2_chain_t *nchain;
2711 hammer2_chain_core_t *above;
2717 oflags = ochain->flags;
2721 * Shortcut DELETED case if possible (only if delete_tid already
2722 * matches the transaction id).
2724 if ((oflags & HAMMER2_CHAIN_DELETED) &&
2725 ochain->delete_tid == trans->sync_tid) {
2730 * First create a duplicate of the chain structure.
2731 * (nchain is allocated with one ref).
2733 nchain = hammer2_chain_alloc(hmp, ochain->pmp, trans, &ochain->bref);
2734 if (flags & HAMMER2_DELDUP_RECORE)
2735 hammer2_chain_core_alloc(trans, nchain, NULL);
2737 hammer2_chain_core_alloc(trans, nchain, ochain);
2738 above = ochain->above;
2740 bytes = (hammer2_off_t)1 <<
2741 (int)(ochain->bref.data_off & HAMMER2_OFF_MASK_RADIX);
2742 nchain->bytes = bytes;
2743 nchain->modify_tid = ochain->modify_tid;
2744 nchain->data_count += ochain->data_count;
2745 nchain->inode_count += ochain->inode_count;
2748 * Lock nchain so both chains are now locked (extremely important
2749 * for atomicy). Mark ochain deleted and reinsert into the topology
2750 * and insert nchain all in one go.
2752 * If the ochain is already deleted it is left alone and nchain
2753 * is inserted into the topology as a deleted chain. This is
2754 * important because it allows ongoing operations to be executed
2755 * on a deleted inode which still has open descriptors.
2757 hammer2_chain_lock(nchain, HAMMER2_RESOLVE_NEVER);
2758 hammer2_chain_dup_fixup(ochain, nchain);
2759 /* extra ref still present from original allocation */
2761 KKASSERT(ochain->flags & HAMMER2_CHAIN_ONRBTREE);
2762 spin_lock(&above->cst.spin);
2763 KKASSERT(ochain->flags & HAMMER2_CHAIN_ONRBTREE);
2765 if (oflags & HAMMER2_CHAIN_DELETED) {
2766 atomic_set_int(&nchain->flags, HAMMER2_CHAIN_DELETED);
2767 nchain->delete_tid = trans->sync_tid;
2768 /*nchain->delete_gen = ++trans->delete_gen;*/
2770 ochain->delete_tid = trans->sync_tid;
2771 /*ochain->delete_gen = ++trans->delete_gen;*/
2772 atomic_set_int(&ochain->flags, HAMMER2_CHAIN_DELETED);
2773 atomic_add_int(&above->live_count, -1);
2776 hammer2_chain_insert(above, nchain,
2777 ((oflags & HAMMER2_CHAIN_DELETED) ?
2778 0: HAMMER2_CHAIN_INSERT_LIVE));
2780 if ((ochain->flags & HAMMER2_CHAIN_MOVED) == 0) {
2781 hammer2_chain_ref(ochain);
2782 atomic_set_int(&ochain->flags, HAMMER2_CHAIN_MOVED);
2784 spin_unlock(&above->cst.spin);
2787 * We have to unlock ochain to flush any dirty data, asserting the
2788 * case (data == NULL) to catch any extra locks that might have been
2789 * present, then transfer state to nchain.
2791 odata = ochain->data;
2792 hammer2_chain_unlock(ochain); /* replacing ochain */
2793 KKASSERT(ochain->bref.type == HAMMER2_BREF_TYPE_INODE ||
2794 ochain->data == NULL);
2796 if (oflags & HAMMER2_CHAIN_INITIAL)
2797 atomic_set_int(&nchain->flags, HAMMER2_CHAIN_INITIAL);
2800 * WARNING! We should never resolve DATA to device buffers
2801 * (XXX allow it if the caller did?), and since
2802 * we currently do not have the logical buffer cache
2803 * buffer in-hand to fix its cached physical offset
2804 * we also force the modify code to not COW it. XXX
2806 if (oflags & HAMMER2_CHAIN_MODIFIED) {
2807 if (nchain->bref.type == HAMMER2_BREF_TYPE_DATA) {
2808 hammer2_chain_modify(trans, &nchain,
2809 HAMMER2_MODIFY_OPTDATA |
2810 HAMMER2_MODIFY_NOREALLOC |
2811 HAMMER2_MODIFY_ASSERTNOCOPY);
2812 } else if (oflags & HAMMER2_CHAIN_INITIAL) {
2813 hammer2_chain_modify(trans, &nchain,
2814 HAMMER2_MODIFY_OPTDATA |
2815 HAMMER2_MODIFY_ASSERTNOCOPY);
2817 hammer2_chain_modify(trans, &nchain,
2818 HAMMER2_MODIFY_ASSERTNOCOPY);
2820 hammer2_chain_drop(nchain);
2822 if (nchain->bref.type == HAMMER2_BREF_TYPE_DATA) {
2823 hammer2_chain_drop(nchain);
2824 } else if (oflags & HAMMER2_CHAIN_INITIAL) {
2825 hammer2_chain_drop(nchain);
2827 hammer2_chain_lock(nchain, HAMMER2_RESOLVE_ALWAYS |
2828 HAMMER2_RESOLVE_NOREF);
2829 hammer2_chain_unlock(nchain);
2834 * Unconditionally set the MOVED and SUBMODIFIED bit to force
2835 * update of parent bref and indirect blockrefs during flush.
2837 if ((nchain->flags & HAMMER2_CHAIN_MOVED) == 0) {
2838 atomic_set_int(&nchain->flags, HAMMER2_CHAIN_MOVED);
2839 hammer2_chain_ref(nchain);
2841 atomic_set_int(&nchain->flags, HAMMER2_CHAIN_SUBMODIFIED);
2842 hammer2_chain_setsubmod(trans, nchain);
2847 * Helper function to fixup inodes. The caller procedure stack may hold
2848 * multiple locks on ochain if it represents an inode, preventing our
2849 * unlock from retiring its state to the buffer cache.
2851 * In this situation any attempt to access the buffer cache could result
2852 * either in stale data or a deadlock. Work around the problem by copying
2853 * the embedded data directly.
2857 hammer2_chain_dup_fixup(hammer2_chain_t *ochain, hammer2_chain_t *nchain)
2859 if (ochain->data == NULL)
2861 switch(ochain->bref.type) {
2862 case HAMMER2_BREF_TYPE_INODE:
2863 KKASSERT(nchain->data == NULL);
2864 atomic_set_int(&nchain->flags, HAMMER2_CHAIN_EMBEDDED);
2865 nchain->data = kmalloc(sizeof(nchain->data->ipdata),
2866 ochain->hmp->mchain, M_WAITOK | M_ZERO);
2867 nchain->data->ipdata = ochain->data->ipdata;
2869 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2870 KKASSERT(nchain->data == NULL);
2871 atomic_set_int(&nchain->flags, HAMMER2_CHAIN_EMBEDDED);
2872 nchain->data = kmalloc(sizeof(nchain->data->bmdata),
2873 ochain->hmp->mchain, M_WAITOK | M_ZERO);
2874 bcopy(ochain->data->bmdata,
2875 nchain->data->bmdata,
2876 sizeof(nchain->data->bmdata));
2884 * Create a snapshot of the specified {parent, chain} with the specified
2885 * label. The originating hammer2_inode must be exclusively locked for
2889 hammer2_chain_snapshot(hammer2_trans_t *trans, hammer2_chain_t *ochain,
2890 hammer2_ioc_pfs_t *pfs)
2892 hammer2_mount_t *hmp;
2893 hammer2_chain_t *nchain;
2894 hammer2_inode_data_t *ipdata;
2895 hammer2_inode_t *nip;
2899 hammer2_chain_t *chain;
2900 hammer2_chain_t *parent;
2901 hammer2_key_t key_dummy;
2902 int cache_index = -1;
2908 name_len = strlen(pfs->name);
2909 lhc = hammer2_dirhash(pfs->name, name_len);
2912 opfs_clid = ochain->data->ipdata.pfs_clid;
2913 KKASSERT((trans->flags & HAMMER2_TRANS_RESTRICTED) == 0);
2916 * Issue a restricted flush of the original. This is a synchronous
2917 * operation. This will synchronize the blockrefs.
2919 /* trans->flags |= HAMMER2_TRANS_RESTRICTED; */
2920 hammer2_chain_flush(trans, ochain);
2921 /* trans->flags &= ~HAMMER2_TRANS_RESTRICTED; */
2922 kprintf("snapshot %s ochain->refs %d ochain->flags %08x\n",
2923 pfs->name, ochain->refs, ochain->flags);
2926 * Create the snapshot directory under the super-root
2928 * Set PFS type, generate a unique filesystem id, and generate
2929 * a cluster id. Use the same clid when snapshotting a PFS root,
2930 * which theoretically allows the snapshot to be used as part of
2931 * the same cluster (perhaps as a cache).
2933 * Copy the (flushed) ochain's blockref array. Theoretically we
2934 * could use chain_duplicate() but it becomes difficult to disentangle
2935 * the shared core so for now just brute-force it.
2941 nip = hammer2_inode_create(trans, hmp->sroot, &vat, proc0.p_ucred,
2942 pfs->name, name_len, &nchain, &error);
2945 ipdata = hammer2_chain_modify_ip(trans, nip, &nchain, 0);
2946 ipdata->pfs_type = HAMMER2_PFSTYPE_SNAPSHOT;
2947 kern_uuidgen(&ipdata->pfs_fsid, 1);
2948 if (ochain->flags & HAMMER2_CHAIN_PFSROOT)
2949 ipdata->pfs_clid = opfs_clid;
2951 kern_uuidgen(&ipdata->pfs_clid, 1);
2952 atomic_set_int(&nchain->flags, HAMMER2_CHAIN_PFSROOT);
2953 ipdata->u.blockset = ochain->data->ipdata.u.blockset;
2955 hammer2_inode_unlock_ex(nip, nchain);
2965 * Get second lock for duplication to replace, original lock
2966 * will be left intact (caller must unlock the original chain).
2969 hammer2_chain_lock(nchain, HAMMER2_RESOLVE_MAYBE);
2972 * Create disconnected duplicate flagged as a snapshot
2974 hammer2_chain_duplicate(trans, NULL, &nchain, NULL, 1);
2977 * Create named entry in the super-root.
2979 parent = hammer2_inode_lock_ex(hmp->sroot);
2981 while (error == 0) {
2982 chain = hammer2_chain_lookup(&parent, &key_dummy,
2983 lhc, lhc, &cache_index, 0);
2986 if ((lhc & HAMMER2_DIRHASH_LOMASK) == HAMMER2_DIRHASH_LOMASK)
2988 hammer2_chain_unlock(chain);
2992 hammer2_chain_create(trans, &parent, &nchain, lhc, 0,
2993 HAMMER2_BREF_TYPE_INODE,
2994 HAMMER2_INODE_BYTES);
2995 hammer2_chain_modify(trans, &nchain, HAMMER2_MODIFY_ASSERTNOCOPY);
2996 hammer2_inode_unlock_ex(hmp->sroot, parent);
2997 parent = NULL; /* safety */
3002 ipdata = &nchain->data->ipdata;
3003 ipdata->name_key = lhc;
3004 ipdata->name_len = name_len;
3005 ksnprintf(ipdata->filename, sizeof(ipdata->filename), "%s", pfs->name);
3008 * Unlock nchain. This should cause nchain to be freed by virtue
3009 * of its SNAPSHOT flag, which serves to disconnect its core. If
3010 * we were to retain nchain it would be a problem because the shared
3011 * core would pick up changes made in the original after the snapshot
3012 * operation has returned.
3014 kprintf("nchain refs %d %08x\n", nchain->refs, nchain->flags);
3015 hammer2_chain_unlock(nchain);
3020 * Create an indirect block that covers one or more of the elements in the
3021 * current parent. Either returns the existing parent with no locking or
3022 * ref changes or returns the new indirect block locked and referenced
3023 * and leaving the original parent lock/ref intact as well.
3025 * If an error occurs, NULL is returned and *errorp is set to the error.
3027 * The returned chain depends on where the specified key falls.
3029 * The key/keybits for the indirect mode only needs to follow three rules:
3031 * (1) That all elements underneath it fit within its key space and
3033 * (2) That all elements outside it are outside its key space.
3035 * (3) When creating the new indirect block any elements in the current
3036 * parent that fit within the new indirect block's keyspace must be
3037 * moved into the new indirect block.
3039 * (4) The keyspace chosen for the inserted indirect block CAN cover a wider
3040 * keyspace the the current parent, but lookup/iteration rules will
3041 * ensure (and must ensure) that rule (2) for all parents leading up
3042 * to the nearest inode or the root volume header is adhered to. This
3043 * is accomplished by always recursing through matching keyspaces in
3044 * the hammer2_chain_lookup() and hammer2_chain_next() API.
3046 * The current implementation calculates the current worst-case keyspace by
3047 * iterating the current parent and then divides it into two halves, choosing
3048 * whichever half has the most elements (not necessarily the half containing
3049 * the requested key).
3051 * We can also opt to use the half with the least number of elements. This
3052 * causes lower-numbered keys (aka logical file offsets) to recurse through
3053 * fewer indirect blocks and higher-numbered keys to recurse through more.
3054 * This also has the risk of not moving enough elements to the new indirect
3055 * block and being forced to create several indirect blocks before the element
3058 * Must be called with an exclusively locked parent.
3060 static int hammer2_chain_indkey_freemap(hammer2_chain_t *parent,
3061 hammer2_key_t *keyp, int keybits,
3062 hammer2_blockref_t *base, int count);
3063 static int hammer2_chain_indkey_normal(hammer2_chain_t *parent,
3064 hammer2_key_t *keyp, int keybits,
3065 hammer2_blockref_t *base, int count);
3068 hammer2_chain_create_indirect(hammer2_trans_t *trans, hammer2_chain_t *parent,
3069 hammer2_key_t create_key, int create_bits,
3070 int for_type, int *errorp)
3072 hammer2_mount_t *hmp;
3073 hammer2_chain_core_t *above;
3074 hammer2_chain_core_t *icore;
3075 hammer2_blockref_t *base;
3076 hammer2_blockref_t *bref;
3077 hammer2_blockref_t bcopy;
3078 hammer2_chain_t *chain;
3079 hammer2_chain_t *ichain;
3080 hammer2_chain_t dummy;
3081 hammer2_key_t key = create_key;
3082 hammer2_key_t key_beg;
3083 hammer2_key_t key_end;
3084 hammer2_key_t key_next;
3085 int keybits = create_bits;
3092 * Calculate the base blockref pointer or NULL if the chain
3093 * is known to be empty. We need to calculate the array count
3094 * for RB lookups either way.
3098 KKASSERT(ccms_thread_lock_owned(&parent->core->cst));
3099 above = parent->core;
3101 /*hammer2_chain_modify(trans, &parent, HAMMER2_MODIFY_OPTDATA);*/
3102 if (parent->flags & HAMMER2_CHAIN_INITIAL) {
3105 switch(parent->bref.type) {
3106 case HAMMER2_BREF_TYPE_INODE:
3107 count = HAMMER2_SET_COUNT;
3109 case HAMMER2_BREF_TYPE_INDIRECT:
3110 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
3111 count = parent->bytes / sizeof(hammer2_blockref_t);
3113 case HAMMER2_BREF_TYPE_VOLUME:
3114 count = HAMMER2_SET_COUNT;
3116 case HAMMER2_BREF_TYPE_FREEMAP:
3117 count = HAMMER2_SET_COUNT;
3120 panic("hammer2_chain_create_indirect: "
3121 "unrecognized blockref type: %d",
3127 switch(parent->bref.type) {
3128 case HAMMER2_BREF_TYPE_INODE:
3129 base = &parent->data->ipdata.u.blockset.blockref[0];
3130 count = HAMMER2_SET_COUNT;
3132 case HAMMER2_BREF_TYPE_INDIRECT:
3133 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
3134 base = &parent->data->npdata[0];
3135 count = parent->bytes / sizeof(hammer2_blockref_t);
3137 case HAMMER2_BREF_TYPE_VOLUME:
3138 base = &hmp->voldata.sroot_blockset.blockref[0];
3139 count = HAMMER2_SET_COUNT;
3141 case HAMMER2_BREF_TYPE_FREEMAP:
3142 base = &hmp->voldata.freemap_blockset.blockref[0];
3143 count = HAMMER2_SET_COUNT;
3146 panic("hammer2_chain_create_indirect: "
3147 "unrecognized blockref type: %d",
3155 * dummy used in later chain allocation (no longer used for lookups).
3157 bzero(&dummy, sizeof(dummy));
3158 dummy.delete_tid = HAMMER2_MAX_TID;
3161 * When creating an indirect block for a freemap node or leaf
3162 * the key/keybits must be fitted to static radix levels because
3163 * particular radix levels use particular reserved blocks in the
3166 * This routine calculates the key/radix of the indirect block
3167 * we need to create, and whether it is on the high-side or the
3170 if (for_type == HAMMER2_BREF_TYPE_FREEMAP_NODE ||
3171 for_type == HAMMER2_BREF_TYPE_FREEMAP_LEAF) {
3172 keybits = hammer2_chain_indkey_freemap(parent, &key, keybits,
3175 keybits = hammer2_chain_indkey_normal(parent, &key, keybits,
3180 * Normalize the key for the radix being represented, keeping the
3181 * high bits and throwing away the low bits.
3183 key &= ~(((hammer2_key_t)1 << keybits) - 1);
3186 * How big should our new indirect block be? It has to be at least
3187 * as large as its parent.
3189 if (parent->bref.type == HAMMER2_BREF_TYPE_INODE)
3190 nbytes = HAMMER2_IND_BYTES_MIN;
3192 nbytes = HAMMER2_IND_BYTES_MAX;
3193 if (nbytes < count * sizeof(hammer2_blockref_t))
3194 nbytes = count * sizeof(hammer2_blockref_t);
3197 * Ok, create our new indirect block
3199 if (for_type == HAMMER2_BREF_TYPE_FREEMAP_NODE ||
3200 for_type == HAMMER2_BREF_TYPE_FREEMAP_LEAF) {
3201 dummy.bref.type = HAMMER2_BREF_TYPE_FREEMAP_NODE;
3203 dummy.bref.type = HAMMER2_BREF_TYPE_INDIRECT;
3205 dummy.bref.key = key;
3206 dummy.bref.keybits = keybits;
3207 dummy.bref.data_off = hammer2_getradix(nbytes);
3208 dummy.bref.methods = parent->bref.methods;
3210 ichain = hammer2_chain_alloc(hmp, parent->pmp, trans, &dummy.bref);
3211 atomic_set_int(&ichain->flags, HAMMER2_CHAIN_INITIAL);
3212 hammer2_chain_core_alloc(trans, ichain, NULL);
3213 icore = ichain->core;
3214 hammer2_chain_lock(ichain, HAMMER2_RESOLVE_MAYBE);
3215 hammer2_chain_drop(ichain); /* excess ref from alloc */
3218 * We have to mark it modified to allocate its block, but use
3219 * OPTDATA to allow it to remain in the INITIAL state. Otherwise
3220 * it won't be acted upon by the flush code.
3222 * XXX leave the node unmodified, depend on the SUBMODIFIED
3223 * flush to assign and modify parent blocks.
3225 hammer2_chain_modify(trans, &ichain, HAMMER2_MODIFY_OPTDATA);
3228 * Iterate the original parent and move the matching brefs into
3229 * the new indirect block.
3231 * XXX handle flushes.
3234 key_end = HAMMER2_MAX_TID;
3236 spin_lock(&above->cst.spin);
3240 kprintf("I %p,%d/%d key %016jx %016jx/%d nbytes=%d\n",
3241 parent, parent->core->live_count,
3242 (int)(parent->bytes / sizeof(hammer2_blockref_t)),
3243 create_key, key, keybits, (int)nbytes);
3246 if (++loops > 8192) {
3247 spin_unlock(&above->cst.spin);
3248 panic("shit parent=%p base/count %p:%d\n",
3249 parent, base, count);
3253 * NOTE: spinlock stays intact, returned chain (if not NULL)
3254 * is not referenced or locked.
3256 chain = hammer2_combined_find(parent, base, count,
3257 &cache_index, &key_next,
3262 if (chain && (chain->flags & HAMMER2_CHAIN_DELETED)) {
3263 if (key_next == 0 || key_next > key_end)
3268 key_next = bref->key + ((hammer2_key_t)1 << bref->keybits);
3270 kprintf("%c%p %016jx,%016jx,%016jx bref=%p,%016jx\n",
3271 (chain ? 'm' : 'd'),
3273 key_beg, key_end, key_next,
3274 bref, (bref ? bref->key : 0));
3278 * Skip keys that are not within the key/radix of the new
3279 * indirect block. They stay in the parent.
3281 if ((~(((hammer2_key_t)1 << keybits) - 1) &
3282 (key ^ bref->key)) != 0) {
3283 if (key_next == 0 || key_next > key_end)
3290 * Load the new indirect block by acquiring or allocating
3291 * the related chain, then move it to the new parent (ichain)
3292 * via DELETE-DUPLICATE.
3294 * WARNING! above->cst.spin must be held when parent is
3295 * modified, even though we own the full blown lock,
3296 * to deal with setsubmod and rename races.
3297 * (XXX remove this req).
3301 * Use chain already present in the RBTREE
3303 hammer2_chain_ref(chain);
3304 spin_unlock(&above->cst.spin);
3305 hammer2_chain_lock(chain, HAMMER2_RESOLVE_NEVER |
3306 HAMMER2_RESOLVE_NOREF);
3309 * Get chain for blockref element. _get returns NULL
3310 * on insertion race.
3313 spin_unlock(&above->cst.spin);
3314 chain = hammer2_chain_get(parent, bref);
3317 if (bcmp(&bcopy, bref, sizeof(bcopy))) {
3318 hammer2_chain_drop(chain);
3321 hammer2_chain_lock(chain, HAMMER2_RESOLVE_NEVER |
3322 HAMMER2_RESOLVE_NOREF);
3324 hammer2_chain_delete(trans, chain, HAMMER2_DELETE_WILLDUP);
3325 hammer2_chain_duplicate(trans, ichain, &chain, NULL, 0);
3326 hammer2_chain_unlock(chain);
3327 KKASSERT(parent->refs > 0);
3329 spin_lock(&above->cst.spin);
3330 if (key_next == 0 || key_next > key_end)
3334 spin_unlock(&above->cst.spin);
3337 * Insert the new indirect block into the parent now that we've
3338 * cleared out some entries in the parent. We calculated a good
3339 * insertion index in the loop above (ichain->index).
3341 * We don't have to set MOVED here because we mark ichain modified
3342 * down below (so the normal modified -> flush -> set-moved sequence
3345 * The insertion shouldn't race as this is a completely new block
3346 * and the parent is locked.
3348 KKASSERT((ichain->flags & HAMMER2_CHAIN_ONRBTREE) == 0);
3349 hammer2_chain_insert(above, ichain, HAMMER2_CHAIN_INSERT_SPIN |
3350 HAMMER2_CHAIN_INSERT_LIVE);
3353 * Mark the new indirect block modified after insertion, which
3354 * will propagate up through parent all the way to the root and
3355 * also allocate the physical block in ichain for our caller,
3356 * and assign ichain->data to a pre-zero'd space (because there
3357 * is not prior data to copy into it).
3359 * We have to set SUBMODIFIED in ichain's flags manually so the
3360 * flusher knows it has to recurse through it to get to all of
3361 * our moved blocks, then call setsubmod() to set the bit
3364 /*hammer2_chain_modify(trans, &ichain, HAMMER2_MODIFY_OPTDATA);*/
3365 atomic_set_int(&ichain->flags, HAMMER2_CHAIN_SUBMODIFIED);
3366 hammer2_chain_setsubmod(trans, ichain);
3369 * Figure out what to return.
3371 if (~(((hammer2_key_t)1 << keybits) - 1) &
3372 (create_key ^ key)) {
3374 * Key being created is outside the key range,
3375 * return the original parent.
3377 hammer2_chain_unlock(ichain);
3379 kprintf("return original parent\n");
3383 * Otherwise its in the range, return the new parent.
3384 * (leave both the new and old parent locked).
3388 kprintf("return new ichain\n");
3396 * Calculate the keybits and highside/lowside of the freemap node the
3397 * caller is creating.
3399 * This routine will specify the next higher-level freemap key/radix
3400 * representing the lowest-ordered set. By doing so, eventually all
3401 * low-ordered sets will be moved one level down.
3403 * We have to be careful here because the freemap reserves a limited
3404 * number of blocks for a limited number of levels. So we can't just
3405 * push indiscriminately.
3408 hammer2_chain_indkey_freemap(hammer2_chain_t *parent, hammer2_key_t *keyp,
3409 int keybits, hammer2_blockref_t *base, int count)
3411 hammer2_chain_core_t *above;
3412 hammer2_chain_t *chain;
3413 hammer2_blockref_t *bref;
3415 hammer2_key_t key_beg;
3416 hammer2_key_t key_end;
3417 hammer2_key_t key_next;
3424 above = parent->core;
3430 * Calculate the range of keys in the array being careful to skip
3431 * slots which are overridden with a deletion.
3434 key_end = HAMMER2_MAX_TID;
3436 spin_lock(&above->cst.spin);
3439 if (++loops == 100000) {
3440 panic("indkey_freemap shit %p %p:%d\n",
3441 parent, base, count);
3443 chain = hammer2_combined_find(parent, base, count,
3444 &cache_index, &key_next,
3445 key_beg, key_end, &bref);
3452 if (chain && (chain->flags & HAMMER2_CHAIN_DELETED)) {
3453 if (key_next == 0 || key_next > key_end)
3458 key_next = bref->key + ((hammer2_key_t)1 << bref->keybits);
3460 if (keybits > bref->keybits) {
3462 keybits = bref->keybits;
3463 } else if (keybits == bref->keybits && bref->key < key) {
3470 spin_unlock(&above->cst.spin);
3473 * Return the keybits for a higher-level FREEMAP_NODE covering
3477 case HAMMER2_FREEMAP_LEVEL0_RADIX:
3478 keybits = HAMMER2_FREEMAP_LEVEL1_RADIX;
3480 case HAMMER2_FREEMAP_LEVEL1_RADIX:
3481 keybits = HAMMER2_FREEMAP_LEVEL2_RADIX;
3483 case HAMMER2_FREEMAP_LEVEL2_RADIX:
3484 keybits = HAMMER2_FREEMAP_LEVEL3_RADIX;
3486 case HAMMER2_FREEMAP_LEVEL3_RADIX:
3487 keybits = HAMMER2_FREEMAP_LEVEL4_RADIX;
3489 case HAMMER2_FREEMAP_LEVEL4_RADIX:
3490 panic("hammer2_chain_indkey_freemap: level too high");
3493 panic("hammer2_chain_indkey_freemap: bad radix");
3502 * Calculate the keybits and highside/lowside of the indirect block the
3503 * caller is creating.
3506 hammer2_chain_indkey_normal(hammer2_chain_t *parent, hammer2_key_t *keyp,
3507 int keybits, hammer2_blockref_t *base, int count)
3509 hammer2_chain_core_t *above;
3510 hammer2_blockref_t *bref;
3511 hammer2_chain_t *chain;
3512 hammer2_key_t key_beg;
3513 hammer2_key_t key_end;
3514 hammer2_key_t key_next;
3523 above = parent->core;
3528 * Calculate the range of keys in the array being careful to skip
3529 * slots which are overridden with a deletion. Once the scan
3530 * completes we will cut the key range in half and shift half the
3531 * range into the new indirect block.
3534 key_end = HAMMER2_MAX_TID;
3536 spin_lock(&above->cst.spin);
3539 if (++loops == 100000) {
3540 panic("indkey_freemap shit %p %p:%d\n",
3541 parent, base, count);
3543 chain = hammer2_combined_find(parent, base, count,
3544 &cache_index, &key_next,
3545 key_beg, key_end, &bref);
3552 if (chain && (chain->flags & HAMMER2_CHAIN_DELETED)) {
3553 if (key_next == 0 || key_next > key_end)
3558 key_next = bref->key + ((hammer2_key_t)1 << bref->keybits);
3561 * Expand our calculated key range (key, keybits) to fit
3562 * the scanned key. nkeybits represents the full range
3563 * that we will later cut in half (two halves @ nkeybits - 1).
3566 if (nkeybits < bref->keybits) {
3567 if (bref->keybits > 64) {
3568 kprintf("bad bref chain %p bref %p\n",
3572 nkeybits = bref->keybits;
3574 while (nkeybits < 64 &&
3575 (~(((hammer2_key_t)1 << nkeybits) - 1) &
3576 (key ^ bref->key)) != 0) {
3581 * If the new key range is larger we have to determine
3582 * which side of the new key range the existing keys fall
3583 * under by checking the high bit, then collapsing the
3584 * locount into the hicount or vise-versa.
3586 if (keybits != nkeybits) {
3587 if (((hammer2_key_t)1 << (nkeybits - 1)) & key) {
3598 * The newly scanned key will be in the lower half or the
3599 * upper half of the (new) key range.
3601 if (((hammer2_key_t)1 << (nkeybits - 1)) & bref->key)
3610 spin_unlock(&above->cst.spin);
3611 bref = NULL; /* now invalid (safety) */
3614 * Adjust keybits to represent half of the full range calculated
3615 * above (radix 63 max)
3620 * Select whichever half contains the most elements. Theoretically
3621 * we can select either side as long as it contains at least one
3622 * element (in order to ensure that a free slot is present to hold
3623 * the indirect block).
3625 if (hammer2_indirect_optimize) {
3627 * Insert node for least number of keys, this will arrange
3628 * the first few blocks of a large file or the first few
3629 * inodes in a directory with fewer indirect blocks when
3632 if (hicount < locount && hicount != 0)
3633 key |= (hammer2_key_t)1 << keybits;
3635 key &= ~(hammer2_key_t)1 << keybits;
3638 * Insert node for most number of keys, best for heavily
3641 if (hicount > locount)
3642 key |= (hammer2_key_t)1 << keybits;
3644 key &= ~(hammer2_key_t)1 << keybits;
3652 * Sets CHAIN_DELETED and CHAIN_MOVED in the chain being deleted and
3653 * set chain->delete_tid.
3655 * This function does NOT generate a modification to the parent. It
3656 * would be nearly impossible to figure out which parent to modify anyway.
3657 * Such modifications are handled by the flush code and are properly merged
3658 * using the flush synchronization point.
3660 * The find/get code will properly overload the RBTREE check on top of
3661 * the bref check to detect deleted entries.
3663 * This function is NOT recursive. Any entity already pushed into the
3664 * chain (such as an inode) may still need visibility into its contents,
3665 * as well as the ability to read and modify the contents. For example,
3666 * for an unlinked file which is still open.
3668 * NOTE: This function does NOT set chain->modify_tid, allowing future
3669 * code to distinguish between live and deleted chains by testing
3672 * NOTE: Deletions normally do not occur in the middle of a duplication
3673 * chain but we use a trick for hardlink migration that refactors
3674 * the originating inode without deleting it, so we make no assumptions
3678 hammer2_chain_delete(hammer2_trans_t *trans, hammer2_chain_t *chain, int flags)
3680 KKASSERT(ccms_thread_lock_owned(&chain->core->cst));
3683 * Nothing to do if already marked.
3685 if (chain->flags & HAMMER2_CHAIN_DELETED)
3689 * We must set MOVED along with DELETED for the flush code to
3690 * recognize the operation and properly disconnect the chain
3693 * The setting of DELETED causes finds, lookups, and _next iterations
3694 * to no longer recognize the chain. RB_SCAN()s will still have
3695 * visibility (needed for flush serialization points).
3697 * We need the spinlock on the core whos RBTREE contains chain
3698 * to protect against races.
3700 KKASSERT(chain->flags & HAMMER2_CHAIN_ONRBTREE);
3701 spin_lock(&chain->above->cst.spin);
3703 chain->delete_tid = trans->sync_tid;
3704 /*chain->delete_gen = ++trans->delete_gen;*/
3705 atomic_set_int(&chain->flags, HAMMER2_CHAIN_DELETED);
3706 atomic_add_int(&chain->above->live_count, -1);
3708 if ((chain->flags & HAMMER2_CHAIN_MOVED) == 0) {
3709 hammer2_chain_ref(chain);
3710 atomic_set_int(&chain->flags, HAMMER2_CHAIN_MOVED);
3712 spin_unlock(&chain->above->cst.spin);
3715 * Mark the underlying block as possibly being free unless WILLDUP
3716 * is set. Duplication can occur in many situations, particularly
3717 * when chains are moved to indirect blocks.
3719 if ((flags & HAMMER2_DELETE_WILLDUP) == 0)
3720 hammer2_freemap_free(trans, chain->hmp, &chain->bref, 0);
3721 hammer2_chain_setsubmod(trans, chain);
3725 * Called with the core spinlock held to check for freeable layers.
3726 * Used by the flush code. Layers can wind up not being freed due
3727 * to the temporary layer->refs count. This function frees up any
3728 * layers that were missed.
3731 hammer2_chain_layer_check_locked(hammer2_mount_t *hmp,
3732 hammer2_chain_core_t *core)
3734 hammer2_chain_layer_t *layer;
3735 hammer2_chain_layer_t *tmp;
3737 tmp = TAILQ_FIRST(&core->layerq);
3738 while ((layer = tmp) != NULL) {
3739 tmp = TAILQ_NEXT(tmp, entry);
3740 if (layer->refs == 0 && RB_EMPTY(&layer->rbtree)) {
3741 TAILQ_REMOVE(&core->layerq, layer, entry);
3744 spin_unlock(&core->cst.spin);
3745 kfree(layer, hmp->mchain);
3746 spin_lock(&core->cst.spin);
3754 * Returns the index of the nearest element in the blockref array >= elm.
3755 * Returns (count) if no element could be found.
3757 * Sets *key_nextp to the next key for loop purposes but does not modify
3758 * it if the next key would be higher than the current value of *key_nextp.
3759 * Note that *key_nexp can overflow to 0, which should be tested by the
3762 * (*cache_indexp) is a heuristic and can be any value without effecting
3765 * The spin lock on the related chain must be held.
3768 hammer2_base_find(hammer2_chain_t *chain,
3769 hammer2_blockref_t *base, int count,
3770 int *cache_indexp, hammer2_key_t *key_nextp,
3771 hammer2_key_t key_beg, hammer2_key_t key_end)
3773 hammer2_blockref_t *scan;
3774 hammer2_key_t scan_end;
3780 KKASSERT(chain->flags & HAMMER2_CHAIN_COUNTEDBREFS);
3781 if (count == 0 || base == NULL)
3785 * Sequential optimization
3789 if (i >= chain->live_zero)
3790 i = chain->live_zero - 1;
3793 KKASSERT(i < count);
3799 while (i > 0 && (scan->type == 0 || scan->key > key_beg)) {
3806 * Search forwards, stop when we find a scan element which
3807 * encloses the key or until we know that there are no further
3811 if (scan->type != 0) {
3812 if (scan->key > key_beg)
3814 scan_end = scan->key +
3815 ((hammer2_key_t)1 << scan->keybits) - 1;
3816 if (scan_end >= key_beg)
3819 if (i >= chain->live_zero)
3826 if (i >= chain->live_zero) {
3829 scan_end = scan->key +
3830 ((hammer2_key_t)1 << scan->keybits);
3831 if (scan_end && (*key_nextp > scan_end ||
3833 *key_nextp = scan_end;
3841 * Do a combined search and return the next match either from the blockref
3842 * array or from the in-memory chain. Sets *bresp to the returned bref in
3843 * both cases, or sets it to NULL if the search exhausted. Only returns
3844 * a non-NULL chain if the search matched from the in-memory chain.
3846 * Must be called with above's spinlock held. Spinlock remains held
3847 * through the operation.
3849 * The returned chain is not locked or referenced. Use the returned bref
3850 * to determine if the search exhausted or not.
3852 static hammer2_chain_t *
3853 hammer2_combined_find(hammer2_chain_t *parent,
3854 hammer2_blockref_t *base, int count,
3855 int *cache_indexp, hammer2_key_t *key_nextp,
3856 hammer2_key_t key_beg, hammer2_key_t key_end,
3857 hammer2_blockref_t **bresp)
3859 hammer2_blockref_t *bref;
3860 hammer2_chain_t *chain;
3863 *key_nextp = key_end + 1;
3864 i = hammer2_base_find(parent, base, count, cache_indexp,
3865 key_nextp, key_beg, key_end);
3866 chain = hammer2_chain_find(parent, key_nextp, key_beg, key_end);
3871 if (i == count && chain == NULL) {
3873 return(chain); /* NULL */
3877 * Only chain matched
3880 bref = &chain->bref;
3885 * Only blockref matched.
3887 if (chain == NULL) {
3893 * Both in-memory and blockref match.
3895 * If they are both flush with the left hand side select the chain.
3896 * If their starts match select the chain.
3897 * Otherwise the nearer element wins.
3899 if (chain->bref.key <= key_beg && base[i].key <= key_beg) {
3900 bref = &chain->bref;
3903 if (chain->bref.key <= base[i].key) {
3904 bref = &chain->bref;
3912 * If the bref is out of bounds we've exhausted our search.
3915 if (bref->key > key_end) {
3925 * Locate the specified block array element and delete it. The element
3928 * The spin lock on the related chain must be held.
3930 * NOTE: live_count was adjusted when the chain was deleted, so it does not
3931 * need to be adjusted when we commit the media change.
3934 hammer2_base_delete(hammer2_chain_t *chain,
3935 hammer2_blockref_t *base, int count,
3936 int *cache_indexp, hammer2_blockref_t *elm)
3938 hammer2_key_t key_next;
3942 * Delete element. Expect the element to exist.
3944 * XXX see caller, flush code not yet sophisticated enough to prevent
3945 * re-flushed in some cases.
3947 key_next = 0; /* max range */
3948 i = hammer2_base_find(chain, base, count, cache_indexp,
3949 &key_next, elm->key, elm->key);
3950 if (i == count || base[i].type == 0 ||
3951 base[i].key != elm->key || base[i].keybits != elm->keybits) {
3952 kprintf("hammer2_base_delete: duplicate key %016jx/%d\n",
3953 elm->key, elm->keybits);
3957 KKASSERT(i != count);
3958 KKASSERT(base[i].type &&
3959 base[i].key == elm->key && base[i].keybits == elm->keybits);
3961 bzero(&base[i], sizeof(*base));
3962 if (chain->live_zero == i + 1) {
3963 while (--i >= 0 && base[i].type == 0)
3965 chain->live_zero = i + 1;
3970 * Insert the specified element. The block array must have space and
3971 * will be rearranged as necessary.
3973 * The spin lock on the related chain must be held.
3975 * Test (*flagsp) for HAMMER2_CHAIN_REPLACE. If set an existing bref
3976 * is replaced, otherwise a new bref is created. The flag is then set
3977 * prior to return indicating that a bref is now present in the block table.
3979 * NOTE: live_count was adjusted when the chain was deleted, so it does not
3980 * need to be adjusted when we commit the media change.
3983 hammer2_base_insert(hammer2_chain_t *chain,
3984 hammer2_blockref_t *base, int count,
3985 int *cache_indexp, hammer2_blockref_t *elm,
3988 hammer2_key_t key_next;
3997 * Insert new element. Expect the element to not already exist
3998 * unless we are replacing it.
4000 * XXX see caller, flush code not yet sophisticated enough to prevent
4001 * re-flushed in some cases.
4003 key_next = 0; /* max range */
4004 i = hammer2_base_find(chain, base, count, cache_indexp,
4005 &key_next, elm->key, elm->key);
4007 if (i != count && (flags & HAMMER2_CHAIN_REPLACE) == 0 &&
4009 base[i].key == elm->key && base[i].keybits == elm->keybits) {
4010 kprintf("hammer2_base_insert: duplicate key %016jx/%d\n",
4011 elm->key, elm->keybits);
4015 KKASSERT(i == count || (flags & HAMMER2_CHAIN_REPLACE) ||
4016 base[i].type == 0 || base[i].key != elm->key ||
4017 base[i].keybits != elm->keybits);
4021 * Shortcut fill optimization, typical ordered insertion(s) may not
4024 KKASSERT(i >= 0 && i <= count);
4026 if (i == count && chain->live_zero < count) {
4027 i = chain->live_zero++;
4033 base[i].key == elm->key &&
4034 base[i].keybits == elm->keybits) {
4039 xkey = elm->key + ((hammer2_key_t)1 << elm->keybits) - 1;
4040 if (i != count && (base[i].key < elm->key || xkey >= base[i].key)) {
4041 panic("insert base %p overlapping elements at %d elm %p\n",
4046 * Try to find an empty slot before or after.
4050 while (j > 0 || k < count) {
4052 if (j >= 0 && base[j].type == 0) {
4056 bcopy(&base[j+1], &base[j],
4057 (i - j - 1) * sizeof(*base));
4063 if (k < count && base[k].type == 0) {
4064 bcopy(&base[i], &base[i+1],
4065 (k - i) * sizeof(hammer2_blockref_t));
4067 if (chain->live_zero <= k)
4068 chain->live_zero = k + 1;
4073 panic("hammer2_base_insert: no room!");
4080 for (l = 0; l < count; ++l) {
4082 key_next = base[l].key +
4083 ((hammer2_key_t)1 << base[l].keybits) - 1;
4087 while (++l < count) {
4089 if (base[l].key <= key_next)
4090 panic("base_insert%d %d,%d,%d fail %p:%d", u, i, j, k, base, l);
4091 key_next = base[l].key +
4092 ((hammer2_key_t)1 << base[l].keybits) - 1;
4102 * Sort the blockref array for the chain. Used by the flush code to
4103 * sort the blockref[] array.
4105 * The chain must be exclusively locked AND spin-locked.
4107 typedef hammer2_blockref_t *hammer2_blockref_p;
4111 hammer2_base_sort_callback(const void *v1, const void *v2)
4113 hammer2_blockref_p bref1 = *(const hammer2_blockref_p *)v1;
4114 hammer2_blockref_p bref2 = *(const hammer2_blockref_p *)v2;
4117 * Make sure empty elements are placed at the end of the array
4119 if (bref1->type == 0) {
4120 if (bref2->type == 0)
4123 } else if (bref2->type == 0) {
4130 if (bref1->key < bref2->key)
4132 if (bref1->key > bref2->key)
4138 hammer2_base_sort(hammer2_chain_t *chain)
4140 hammer2_blockref_t *base;
4143 switch(chain->bref.type) {
4144 case HAMMER2_BREF_TYPE_INODE:
4146 * Special shortcut for embedded data returns the inode
4147 * itself. Callers must detect this condition and access
4148 * the embedded data (the strategy code does this for us).
4150 * This is only applicable to regular files and softlinks.
4152 if (chain->data->ipdata.op_flags & HAMMER2_OPFLAG_DIRECTDATA)
4154 base = &chain->data->ipdata.u.blockset.blockref[0];
4155 count = HAMMER2_SET_COUNT;
4157 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
4158 case HAMMER2_BREF_TYPE_INDIRECT:
4160 * Optimize indirect blocks in the INITIAL state to avoid
4163 KKASSERT((chain->flags & HAMMER2_CHAIN_INITIAL) == 0);
4164 base = &chain->data->npdata[0];
4165 count = chain->bytes / sizeof(hammer2_blockref_t);
4167 case HAMMER2_BREF_TYPE_VOLUME:
4168 base = &chain->hmp->voldata.sroot_blockset.blockref[0];
4169 count = HAMMER2_SET_COUNT;
4171 case HAMMER2_BREF_TYPE_FREEMAP:
4172 base = &chain->hmp->voldata.freemap_blockset.blockref[0];
4173 count = HAMMER2_SET_COUNT;
4176 panic("hammer2_chain_lookup: unrecognized blockref type: %d",
4178 base = NULL; /* safety */
4179 count = 0; /* safety */
4181 kqsort(base, count, sizeof(*base), hammer2_base_sort_callback);
4187 * Chain memory management
4190 hammer2_chain_wait(hammer2_chain_t *chain)
4192 tsleep(chain, 0, "chnflw", 1);
4196 * Manage excessive memory resource use for chain and related
4200 hammer2_chain_memory_wait(hammer2_pfsmount_t *pmp)
4203 while (pmp->inmem_chains > desiredvnodes / 10 &&
4204 pmp->inmem_chains > pmp->mp->mnt_nvnodelistsize * 2) {
4207 pmp->inmem_waiting = 1;
4208 tsleep(&pmp->inmem_waiting, 0, "chnmem", hz);
4212 if (pmp->inmem_chains > desiredvnodes / 10 &&
4213 pmp->inmem_chains > pmp->mp->mnt_nvnodelistsize * 7 / 4) {
4220 hammer2_chain_memory_wakeup(hammer2_pfsmount_t *pmp)
4222 if (pmp->inmem_waiting &&
4223 (pmp->inmem_chains <= desiredvnodes / 10 ||
4224 pmp->inmem_chains <= pmp->mp->mnt_nvnodelistsize * 2)) {
4226 pmp->inmem_waiting = 0;
4227 wakeup(&pmp->inmem_waiting);
4233 adjreadcounter(hammer2_blockref_t *bref, size_t bytes)
4237 switch(bref->type) {
4238 case HAMMER2_BREF_TYPE_DATA:
4239 counterp = &hammer2_iod_file_read;
4241 case HAMMER2_BREF_TYPE_INODE:
4242 counterp = &hammer2_iod_meta_read;
4244 case HAMMER2_BREF_TYPE_INDIRECT:
4245 counterp = &hammer2_iod_indr_read;
4247 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
4248 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
4249 counterp = &hammer2_iod_fmap_read;
4252 counterp = &hammer2_iod_volu_read;