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
34 * $DragonFly: src/sys/vfs/hammer/hammer_transaction.c,v 1.25 2008/09/23 21:03:52 dillon Exp $
39 static u_int32_t ocp_allocbit(hammer_objid_cache_t ocp, u_int32_t n);
43 * Start a standard transaction.
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.
69 hammer_simple_transaction(struct hammer_transaction *trans,
70 struct hammer_mount *hmp)
75 trans->type = HAMMER_TRANS_RO;
77 trans->rootvol = hammer_get_root_volume(hmp, &error);
80 trans->sync_lock_refs = 0;
84 trans->time = (unsigned long)tv.tv_sec * 1000000ULL + tv.tv_usec;
85 trans->time32 = (u_int32_t)tv.tv_sec;
89 * Start a transaction using a particular TID. Used by the sync code.
90 * This does not stall.
92 * This routine may only be called from the flusher thread. We predispose
93 * sync_lock_refs, implying serialization against the synchronization stage
94 * (which the flusher is responsible for).
97 hammer_start_transaction_fls(struct hammer_transaction *trans,
98 struct hammer_mount *hmp)
103 bzero(trans, sizeof(*trans));
105 trans->type = HAMMER_TRANS_FLS;
107 trans->rootvol = hammer_get_root_volume(hmp, &error);
108 KKASSERT(error == 0);
109 trans->tid = hammer_alloc_tid(hmp, 1);
110 trans->sync_lock_refs = 1;
114 trans->time = (unsigned long)tv.tv_sec * 1000000ULL + tv.tv_usec;
115 trans->time32 = (u_int32_t)tv.tv_sec;
119 hammer_done_transaction(struct hammer_transaction *trans)
121 hammer_mount_t hmp = trans->hmp;
122 int expected_lock_refs;
124 hammer_rel_volume(trans->rootvol, 0);
125 trans->rootvol = NULL;
126 expected_lock_refs = (trans->type == HAMMER_TRANS_FLS) ? 1 : 0;
127 KKASSERT(trans->sync_lock_refs == expected_lock_refs);
128 trans->sync_lock_refs = 0;
129 if (trans->type != HAMMER_TRANS_FLS) {
130 if (trans->flags & HAMMER_TRANSF_NEWINODE)
131 hammer_inode_waitreclaims(hmp);
132 else if (trans->flags & HAMMER_TRANSF_DIDIO)
133 hammer_inode_waitreclaims(hmp);
138 * Allocate (count) TIDs. If running in multi-master mode the returned
139 * base will be aligned to a 16-count plus the master id (0-15).
140 * Multi-master mode allows non-conflicting to run and new objects to be
141 * created on multiple masters in parallel. The transaction id identifies
142 * the original master. The object_id is also subject to this rule in
143 * order to allow objects to be created on multiple masters in parallel.
145 * Directories may pre-allocate a large number of object ids (100,000).
147 * NOTE: There is no longer a requirement that successive transaction
148 * ids be 2 apart for separator generation.
150 * NOTE: When called by pseudo-backends such as ioctls the allocated
151 * TID will be larger then the current flush TID, if a flush is running,
152 * so any mirroring will pick the records up on a later flush.
155 hammer_alloc_tid(hammer_mount_t hmp, int count)
159 if (hmp->master_id < 0) {
160 tid = hmp->next_tid + 1;
161 hmp->next_tid = tid + count;
163 tid = (hmp->next_tid + HAMMER_MAX_MASTERS) &
164 ~(hammer_tid_t)(HAMMER_MAX_MASTERS - 1);
165 hmp->next_tid = tid + count * HAMMER_MAX_MASTERS;
166 tid |= hmp->master_id;
168 if (tid >= 0xFFFFFFFFFF000000ULL)
169 panic("hammer_start_transaction: Ran out of TIDs!");
170 if (hammer_debug_tid)
171 kprintf("alloc_tid %016llx\n", (long long)tid);
176 * Allocate an object id.
178 * We use the upper OBJID_CACHE_BITS bits of the namekey to try to match
179 * the low bits of the objid we allocate.
182 hammer_alloc_objid(hammer_mount_t hmp, hammer_inode_t dip, int64_t namekey)
184 hammer_objid_cache_t ocp;
189 while ((ocp = dip->objid_cache) == NULL) {
190 if (hmp->objid_cache_count < OBJID_CACHE_SIZE) {
191 ocp = kmalloc(sizeof(*ocp), hmp->m_misc,
193 ocp->base_tid = hammer_alloc_tid(hmp,
194 OBJID_CACHE_BULK * 2);
195 ocp->base_tid += OBJID_CACHE_BULK_MASK64;
196 ocp->base_tid &= ~OBJID_CACHE_BULK_MASK64;
197 TAILQ_INSERT_HEAD(&hmp->objid_cache_list, ocp, entry);
198 ++hmp->objid_cache_count;
199 /* may have blocked, recheck */
200 if (dip->objid_cache == NULL) {
201 dip->objid_cache = ocp;
206 * Steal one from another directory?
208 * Throw away ocp's that are more then half full, they
209 * aren't worth stealing.
211 ocp = TAILQ_FIRST(&hmp->objid_cache_list);
213 ocp->dip->objid_cache = NULL;
214 if (ocp->count >= OBJID_CACHE_BULK / 2) {
215 --hmp->objid_cache_count;
216 kfree(ocp, hmp->m_misc);
218 dip->objid_cache = ocp;
223 TAILQ_REMOVE(&hmp->objid_cache_list, ocp, entry);
226 * Allocate a bit based on our namekey for the low bits of our
229 incluster = (hmp->master_id >= 0);
230 n = (namekey >> (63 - OBJID_CACHE_BULK_BITS)) & OBJID_CACHE_BULK_MASK;
231 n = ocp_allocbit(ocp, n);
232 tid = ocp->base_tid + n;
236 * The TID is incremented by 1 or by 16 depending what mode the
237 * mount is operating in.
239 ocp->next_tid += (hmp->master_id < 0) ? 1 : HAMMER_MAX_MASTERS;
241 if (ocp->count >= OBJID_CACHE_BULK / 2) {
242 dip->objid_cache = NULL;
243 --hmp->objid_cache_count;
245 kfree(ocp, hmp->m_misc);
247 TAILQ_INSERT_TAIL(&hmp->objid_cache_list, ocp, entry);
253 * Allocate a bit starting with bit n. Wrap if necessary.
255 * This routine is only ever called if a bit is available somewhere
259 ocp_allocbit(hammer_objid_cache_t ocp, u_int32_t n)
266 while (ocp->bm1[n0] & (1 << n)) {
267 if (ocp->bm0 & (1 << n0)) {
270 } else if (++n == 32) {
276 ocp->bm1[n0] |= 1 << n;
277 if (ocp->bm1[n0] == 0xFFFFFFFFU)
279 return((n0 << 5) + n);
283 hammer_clear_objid(hammer_inode_t dip)
285 hammer_objid_cache_t ocp;
287 if ((ocp = dip->objid_cache) != NULL) {
288 dip->objid_cache = NULL;
290 TAILQ_REMOVE(&dip->hmp->objid_cache_list, ocp, entry);
291 TAILQ_INSERT_HEAD(&dip->hmp->objid_cache_list, ocp, entry);
296 hammer_destroy_objid_cache(hammer_mount_t hmp)
298 hammer_objid_cache_t ocp;
300 while ((ocp = TAILQ_FIRST(&hmp->objid_cache_list)) != NULL) {
301 TAILQ_REMOVE(&hmp->objid_cache_list, ocp, entry);
303 ocp->dip->objid_cache = NULL;
304 kfree(ocp, hmp->m_misc);