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
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24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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34 * $DragonFly: src/sys/vfs/hammer/hammer_transaction.c,v 1.13 2008/04/25 21:49:49 dillon Exp $
40 * Start a standard transaction.
43 hammer_start_transaction(struct hammer_transaction *trans,
44 struct hammer_mount *hmp)
48 trans->type = HAMMER_TRANS_STD;
50 trans->rootvol = hammer_get_root_volume(hmp, &error);
53 trans->time = hammer_alloc_tid(trans);
57 * Start a simple read-only transaction. This will not stall.
60 hammer_simple_transaction(struct hammer_transaction *trans,
61 struct hammer_mount *hmp)
65 trans->type = HAMMER_TRANS_RO;
67 trans->rootvol = hammer_get_root_volume(hmp, &error);
70 trans->time = hammer_alloc_tid(trans);
74 * Start a transaction using a particular TID. Used by the sync code.
75 * This does not stall.
78 hammer_start_transaction_fls(struct hammer_transaction *trans,
79 struct hammer_mount *hmp)
83 trans->type = HAMMER_TRANS_FLS;
85 trans->rootvol = hammer_get_root_volume(hmp, &error);
87 trans->tid = hammer_alloc_tid(trans);
88 trans->time = trans->tid;
92 hammer_done_transaction(struct hammer_transaction *trans)
94 hammer_rel_volume(trans->rootvol, 0);
95 trans->rootvol = NULL;
99 * Note: Successive transaction ids must be at least 2 apart so the
100 * B-Tree code can make a separator that does not match either the
101 * left or right hand sides.
104 hammer_alloc_tid(hammer_transaction_t trans)
110 tid = ts.tv_sec * 1000000000LL + ts.tv_nsec;
111 if (tid < trans->hmp->next_tid)
112 tid = trans->hmp->next_tid;
114 hammer_modify_volume(trans, trans->rootvol, NULL, 0);
115 ondisk = trans->rootvol->ondisk;
116 if (tid < ondisk->vol0_next_tid)
117 tid = ondisk->vol0_next_tid;
119 if (tid >= 0xFFFFFFFFFFFFFFF0ULL)
120 panic("hammer_start_transaction: Ran out of TIDs!");
121 if (hammer_debug_tid) {
122 kprintf("alloc_tid %016llx (0x%08x)\n",
123 tid, (int)(tid / 1000000000LL));
126 ondisk->vol0_next_tid = tid + 2;
127 hammer_modify_volume_done(trans->rootvol);
129 trans->hmp->next_tid = tid + 2;