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 1.24 2008/07/19 18:44:49 dillon Exp $
39 static hammer_tid_t
hammer_alloc_tid(hammer_mount_t hmp
, int count
);
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;
60 trans
->time
= (unsigned long)tv
.tv_sec
* 1000000ULL + tv
.tv_usec
;
61 trans
->time32
= (u_int32_t
)tv
.tv_sec
;
65 * Start a simple read-only transaction. This will not stall.
68 hammer_simple_transaction(struct hammer_transaction
*trans
,
69 struct hammer_mount
*hmp
)
74 trans
->type
= HAMMER_TRANS_RO
;
76 trans
->rootvol
= hammer_get_root_volume(hmp
, &error
);
79 trans
->sync_lock_refs
= 0;
82 trans
->time
= (unsigned long)tv
.tv_sec
* 1000000ULL + tv
.tv_usec
;
83 trans
->time32
= (u_int32_t
)tv
.tv_sec
;
87 * Start a transaction using a particular TID. Used by the sync code.
88 * This does not stall.
90 * This routine may only be called from the flusher thread. We predispose
91 * sync_lock_refs, implying serialization against the synchronization stage
92 * (which the flusher is responsible for).
95 hammer_start_transaction_fls(struct hammer_transaction
*trans
,
96 struct hammer_mount
*hmp
)
101 bzero(trans
, sizeof(*trans
));
103 trans
->type
= HAMMER_TRANS_FLS
;
105 trans
->rootvol
= hammer_get_root_volume(hmp
, &error
);
106 KKASSERT(error
== 0);
107 trans
->tid
= hammer_alloc_tid(hmp
, 1);
108 trans
->sync_lock_refs
= 1;
111 trans
->time
= (unsigned long)tv
.tv_sec
* 1000000ULL + tv
.tv_usec
;
112 trans
->time32
= (u_int32_t
)tv
.tv_sec
;
116 hammer_done_transaction(struct hammer_transaction
*trans
)
118 int expected_lock_refs
;
120 hammer_rel_volume(trans
->rootvol
, 0);
121 trans
->rootvol
= NULL
;
122 expected_lock_refs
= (trans
->type
== HAMMER_TRANS_FLS
) ? 1 : 0;
123 KKASSERT(trans
->sync_lock_refs
== expected_lock_refs
);
124 trans
->sync_lock_refs
= 0;
128 * Allocate (count) TIDs. If running in multi-master mode the returned
129 * base will be aligned to a 16-count plus the master id (0-15).
130 * Multi-master mode allows non-conflicting to run and new objects to be
131 * created on multiple masters in parallel. The transaction id identifies
132 * the original master. The object_id is also subject to this rule in
133 * order to allow objects to be created on multiple masters in parallel.
135 * Directories may pre-allocate a large number of object ids (100,000).
137 * NOTE: There is no longer a requirement that successive transaction
138 * ids be 2 apart for separator generation.
141 hammer_alloc_tid(hammer_mount_t hmp
, int count
)
145 if (hmp
->master_id
< 0) {
146 tid
= hmp
->next_tid
+ 1;
147 hmp
->next_tid
= tid
+ count
;
149 tid
= (hmp
->next_tid
+ HAMMER_MAX_MASTERS
) &
150 ~(hammer_tid_t
)(HAMMER_MAX_MASTERS
- 1);
151 hmp
->next_tid
= tid
+ count
* HAMMER_MAX_MASTERS
;
152 tid
|= hmp
->master_id
;
154 if (tid
>= 0xFFFFFFFFFF000000ULL
)
155 panic("hammer_start_transaction: Ran out of TIDs!");
156 if (hammer_debug_tid
)
157 kprintf("alloc_tid %016llx\n", tid
);
162 * Allocate an object id
165 hammer_alloc_objid(hammer_mount_t hmp
, hammer_inode_t dip
)
167 hammer_objid_cache_t ocp
;
170 while ((ocp
= dip
->objid_cache
) == NULL
) {
171 if (hmp
->objid_cache_count
< OBJID_CACHE_SIZE
) {
172 ocp
= kmalloc(sizeof(*ocp
), M_HAMMER
, M_WAITOK
|M_ZERO
);
173 ocp
->next_tid
= hammer_alloc_tid(hmp
, OBJID_CACHE_BULK
);
174 ocp
->count
= OBJID_CACHE_BULK
;
175 TAILQ_INSERT_HEAD(&hmp
->objid_cache_list
, ocp
, entry
);
176 ++hmp
->objid_cache_count
;
177 /* may have blocked, recheck */
178 if (dip
->objid_cache
== NULL
) {
179 dip
->objid_cache
= ocp
;
183 ocp
= TAILQ_FIRST(&hmp
->objid_cache_list
);
185 ocp
->dip
->objid_cache
= NULL
;
186 dip
->objid_cache
= ocp
;
190 TAILQ_REMOVE(&hmp
->objid_cache_list
, ocp
, entry
);
193 * The TID is incremented by 1 or by 16 depending what mode the
194 * mount is operating in.
197 ocp
->next_tid
+= (hmp
->master_id
< 0) ? 1 : HAMMER_MAX_MASTERS
;
199 if (--ocp
->count
== 0) {
200 dip
->objid_cache
= NULL
;
201 --hmp
->objid_cache_count
;
203 kfree(ocp
, M_HAMMER
);
205 TAILQ_INSERT_TAIL(&hmp
->objid_cache_list
, ocp
, entry
);
211 hammer_clear_objid(hammer_inode_t dip
)
213 hammer_objid_cache_t ocp
;
215 if ((ocp
= dip
->objid_cache
) != NULL
) {
216 dip
->objid_cache
= NULL
;
218 TAILQ_REMOVE(&dip
->hmp
->objid_cache_list
, ocp
, entry
);
219 TAILQ_INSERT_HEAD(&dip
->hmp
->objid_cache_list
, ocp
, entry
);
224 hammer_destroy_objid_cache(hammer_mount_t hmp
)
226 hammer_objid_cache_t ocp
;
228 while ((ocp
= TAILQ_FIRST(&hmp
->objid_cache_list
)) != NULL
) {
229 TAILQ_REMOVE(&hmp
->objid_cache_list
, ocp
, entry
);
231 ocp
->dip
->objid_cache
= NULL
;
232 kfree(ocp
, M_HAMMER
);