2 * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 static u_int32_t ocp_allocbit(hammer_objid_cache_t ocp, u_int32_t n);
41 * Start a standard transaction.
43 * May be called without fs_token
46 hammer_start_transaction(struct hammer_transaction *trans,
47 struct hammer_mount *hmp)
52 trans->type = HAMMER_TRANS_STD;
54 trans->rootvol = hammer_get_root_volume(hmp, &error);
57 trans->sync_lock_refs = 0;
61 trans->time = (unsigned long)tv.tv_sec * 1000000ULL + tv.tv_usec;
62 trans->time32 = (u_int32_t)tv.tv_sec;
66 * Start a simple read-only transaction. This will not stall.
68 * May be called without fs_token
71 hammer_simple_transaction(struct hammer_transaction *trans,
72 struct hammer_mount *hmp)
77 trans->type = HAMMER_TRANS_RO;
79 trans->rootvol = hammer_get_root_volume(hmp, &error);
82 trans->sync_lock_refs = 0;
86 trans->time = (unsigned long)tv.tv_sec * 1000000ULL + tv.tv_usec;
87 trans->time32 = (u_int32_t)tv.tv_sec;
91 * Start a transaction using a particular TID. Used by the sync code.
92 * This does not stall.
94 * This routine may only be called from the flusher thread. We predispose
95 * sync_lock_refs, implying serialization against the synchronization stage
96 * (which the flusher is responsible for).
99 hammer_start_transaction_fls(struct hammer_transaction *trans,
100 struct hammer_mount *hmp)
105 bzero(trans, sizeof(*trans));
107 trans->type = HAMMER_TRANS_FLS;
109 trans->rootvol = hammer_get_root_volume(hmp, &error);
110 KKASSERT(error == 0);
111 trans->tid = hammer_alloc_tid(hmp, 1);
112 trans->sync_lock_refs = 1;
116 trans->time = (unsigned long)tv.tv_sec * 1000000ULL + tv.tv_usec;
117 trans->time32 = (u_int32_t)tv.tv_sec;
121 * May be called without fs_token
124 hammer_done_transaction(struct hammer_transaction *trans)
126 int expected_lock_refs __debugvar;
128 hammer_rel_volume(trans->rootvol, 0);
129 trans->rootvol = NULL;
130 expected_lock_refs = (trans->type == HAMMER_TRANS_FLS) ? 1 : 0;
131 KKASSERT(trans->sync_lock_refs == expected_lock_refs);
132 trans->sync_lock_refs = 0;
133 if (trans->type != HAMMER_TRANS_FLS) {
134 if (trans->flags & HAMMER_TRANSF_NEWINODE) {
135 lwkt_gettoken(&trans->hmp->fs_token);
136 hammer_inode_waitreclaims(trans);
137 lwkt_reltoken(&trans->hmp->fs_token);
143 * Allocate (count) TIDs. If running in multi-master mode the returned
144 * base will be aligned to a 16-count plus the master id (0-15).
145 * Multi-master mode allows non-conflicting to run and new objects to be
146 * created on multiple masters in parallel. The transaction id identifies
147 * the original master. The object_id is also subject to this rule in
148 * order to allow objects to be created on multiple masters in parallel.
150 * Directories may pre-allocate a large number of object ids (100,000).
152 * NOTE: There is no longer a requirement that successive transaction
153 * ids be 2 apart for separator generation.
155 * NOTE: When called by pseudo-backends such as ioctls the allocated
156 * TID will be larger then the current flush TID, if a flush is running,
157 * so any mirroring will pick the records up on a later flush.
160 hammer_alloc_tid(hammer_mount_t hmp, int count)
164 if (hmp->master_id < 0) {
165 tid = hmp->next_tid + 1;
166 hmp->next_tid = tid + count;
168 tid = (hmp->next_tid + HAMMER_MAX_MASTERS) &
169 ~(hammer_tid_t)(HAMMER_MAX_MASTERS - 1);
170 hmp->next_tid = tid + count * HAMMER_MAX_MASTERS;
171 tid |= hmp->master_id;
173 if (tid >= 0xFFFFFFFFFF000000ULL)
174 panic("hammer_start_transaction: Ran out of TIDs!");
175 if (hammer_debug_tid)
176 kprintf("alloc_tid %016llx\n", (long long)tid);
181 * Allocate an object id.
183 * We use the upper OBJID_CACHE_BITS bits of the namekey to try to match
184 * the low bits of the objid we allocate.
187 hammer_alloc_objid(hammer_mount_t hmp, hammer_inode_t dip, int64_t namekey)
189 hammer_objid_cache_t ocp;
193 while ((ocp = dip->objid_cache) == NULL) {
194 if (hmp->objid_cache_count < OBJID_CACHE_SIZE) {
195 ocp = kmalloc(sizeof(*ocp), hmp->m_misc,
197 ocp->base_tid = hammer_alloc_tid(hmp,
198 OBJID_CACHE_BULK * 2);
199 ocp->base_tid += OBJID_CACHE_BULK_MASK64;
200 ocp->base_tid &= ~OBJID_CACHE_BULK_MASK64;
201 /* may have blocked, recheck */
202 if (dip->objid_cache == NULL) {
203 TAILQ_INSERT_TAIL(&hmp->objid_cache_list,
205 ++hmp->objid_cache_count;
206 dip->objid_cache = ocp;
209 kfree(ocp, hmp->m_misc);
213 * Steal one from another directory?
215 * Throw away ocp's that are more then half full, they
216 * aren't worth stealing.
218 ocp = TAILQ_FIRST(&hmp->objid_cache_list);
220 ocp->dip->objid_cache = NULL;
221 if (ocp->count >= OBJID_CACHE_BULK / 2) {
222 TAILQ_REMOVE(&hmp->objid_cache_list,
224 --hmp->objid_cache_count;
225 kfree(ocp, hmp->m_misc);
227 dip->objid_cache = ocp;
232 TAILQ_REMOVE(&hmp->objid_cache_list, ocp, entry);
235 * Allocate inode numbers uniformly.
238 n = (namekey >> (63 - OBJID_CACHE_BULK_BITS)) & OBJID_CACHE_BULK_MASK;
239 n = ocp_allocbit(ocp, n);
240 tid = ocp->base_tid + n;
244 * The TID is incremented by 1 or by 16 depending what mode the
245 * mount is operating in.
247 ocp->next_tid += (hmp->master_id < 0) ? 1 : HAMMER_MAX_MASTERS;
249 if (ocp->count >= OBJID_CACHE_BULK * 3 / 4) {
250 dip->objid_cache = NULL;
251 --hmp->objid_cache_count;
253 kfree(ocp, hmp->m_misc);
255 TAILQ_INSERT_TAIL(&hmp->objid_cache_list, ocp, entry);
261 * Allocate a bit starting with bit n. Wrap if necessary.
263 * This routine is only ever called if a bit is available somewhere
267 ocp_allocbit(hammer_objid_cache_t ocp, u_int32_t n)
274 while (ocp->bm1[n0] & (1 << n)) {
275 if (ocp->bm0 & (1 << n0)) {
278 } else if (++n == 32) {
284 ocp->bm1[n0] |= 1 << n;
285 if (ocp->bm1[n0] == 0xFFFFFFFFU)
287 return((n0 << 5) + n);
291 hammer_clear_objid(hammer_inode_t dip)
293 hammer_objid_cache_t ocp;
295 if ((ocp = dip->objid_cache) != NULL) {
296 dip->objid_cache = NULL;
298 TAILQ_REMOVE(&dip->hmp->objid_cache_list, ocp, entry);
299 TAILQ_INSERT_HEAD(&dip->hmp->objid_cache_list, ocp, entry);
304 hammer_destroy_objid_cache(hammer_mount_t hmp)
306 hammer_objid_cache_t ocp;
308 while ((ocp = TAILQ_FIRST(&hmp->objid_cache_list)) != NULL) {
309 TAILQ_REMOVE(&hmp->objid_cache_list, ocp, entry);
311 ocp->dip->objid_cache = NULL;
312 kfree(ocp, hmp->m_misc);
313 --hmp->objid_cache_count;
315 KKASSERT(hmp->objid_cache_count == 0);