Mercurial > trustbridge > nss-cmake-static

annotate nss/lib/dbm/src/hash_buf.c @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 150b72113545
children
rev   line source
3
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1 /*-
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2 * Copyright (c) 1990, 1993, 1994
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3 * The Regents of the University of California. All rights reserved.
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4 *
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5 * This code is derived from software contributed to Berkeley by
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6 * Margo Seltzer.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 * 1. Redistributions of source code must retain the above copyright
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12 * notice, this list of conditions and the following disclaimer.
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13 * 2. Redistributions in binary form must reproduce the above copyright
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14 * notice, this list of conditions and the following disclaimer in the
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15 * documentation and/or other materials provided with the distribution.
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16 * 3. ***REMOVED*** - see
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17 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
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18 * 4. Neither the name of the University nor the names of its contributors
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19 * may be used to endorse or promote products derived from this software
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20 * without specific prior written permission.
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21 *
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22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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32 * SUCH DAMAGE.
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33 */
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34
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35 #if defined(LIBC_SCCS) && !defined(lint)
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36 static char sccsid[] = "@(#)hash_buf.c 8.5 (Berkeley) 7/15/94";
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37 #endif /* LIBC_SCCS and not lint */
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38
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39 /*
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40 * PACKAGE: hash
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41 *
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42 * DESCRIPTION:
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43 * Contains buffer management
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44 *
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45 * ROUTINES:
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46 * External
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47 * __buf_init
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48 * __get_buf
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49 * __buf_free
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50 * __reclaim_buf
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51 * Internal
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52 * newbuf
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53 */
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54 #if !defined(_WIN32) && !defined(_WINDOWS) && !defined(macintosh)
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55 #include <sys/param.h>
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56 #endif
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57
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58 #include <errno.h>
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59 #include <stddef.h>
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60 #include <stdio.h>
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61 #include <stdlib.h>
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62 #include <string.h>
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63
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64 #ifdef DEBUG
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65 #include <assert.h>
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66 #endif
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67
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68 #include "mcom_db.h"
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69 #include "hash.h"
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70 #include "page.h"
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71 /* #include "extern.h" */
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72
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73 static BUFHEAD *newbuf __P((HTAB *, uint32, BUFHEAD *));
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74
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75 /* Unlink B from its place in the lru */
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76 #define BUF_REMOVE(B) { \
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77 (B)->prev->next = (B)->next; \
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78 (B)->next->prev = (B)->prev; \
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79 }
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80
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81 /* Insert B after P */
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82 #define BUF_INSERT(B, P) { \
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83 (B)->next = (P)->next; \
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84 (B)->prev = (P); \
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85 (P)->next = (B); \
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86 (B)->next->prev = (B); \
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87 }
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88
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89 #define MRU hashp->bufhead.next
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90 #define LRU hashp->bufhead.prev
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91
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92 #define MRU_INSERT(B) BUF_INSERT((B), &hashp->bufhead)
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93 #define LRU_INSERT(B) BUF_INSERT((B), LRU)
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94
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95 /*
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96 * We are looking for a buffer with address "addr". If prev_bp is NULL, then
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97 * address is a bucket index. If prev_bp is not NULL, then it points to the
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98 * page previous to an overflow page that we are trying to find.
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99 *
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100 * CAVEAT: The buffer header accessed via prev_bp's ovfl field may no longer
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101 * be valid. Therefore, you must always verify that its address matches the
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102 * address you are seeking.
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103 */
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104 extern BUFHEAD *
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105 __get_buf(HTAB *hashp, uint32 addr, BUFHEAD *prev_bp, int newpage)
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106 /* If prev_bp set, indicates a new overflow page. */
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107 {
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108 register BUFHEAD *bp;
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109 register uint32 is_disk_mask;
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110 register int is_disk, segment_ndx = 0;
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111 SEGMENT segp = 0;
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112
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113 is_disk = 0;
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114 is_disk_mask = 0;
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115 if (prev_bp) {
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116 bp = prev_bp->ovfl;
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117 if (!bp || (bp->addr != addr))
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118 bp = NULL;
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119 if (!newpage)
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120 is_disk = BUF_DISK;
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121 } else {
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122 /* Grab buffer out of directory */
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123 segment_ndx = addr & (hashp->SGSIZE - 1);
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124
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125 /* valid segment ensured by __call_hash() */
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126 segp = hashp->dir[addr >> hashp->SSHIFT];
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127 #ifdef DEBUG
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128 assert(segp != NULL);
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129 #endif
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130
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131 bp = PTROF(segp[segment_ndx]);
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132
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133 is_disk_mask = ISDISK(segp[segment_ndx]);
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134 is_disk = is_disk_mask || !hashp->new_file;
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135 }
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136
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137 if (!bp) {
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138 bp = newbuf(hashp, addr, prev_bp);
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139 if (!bp)
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140 return(NULL);
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141 if(__get_page(hashp, bp->page, addr, !prev_bp, is_disk, 0))
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142 {
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143 /* free bp and its page */
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144 if(prev_bp)
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145 {
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parents:
diff changeset
146 /* if prev_bp is set then the new page that
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parents:
diff changeset
147 * failed is hooked onto prev_bp as an overflow page.
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parents:
diff changeset
148 * if we don't remove the pointer to the bad page
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parents:
diff changeset
149 * we may try and access it later and we will die
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
150 * horribly because it will have already been
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
151 * free'd and overwritten with bogus data.
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parents:
diff changeset
152 */
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parents:
diff changeset
153 prev_bp->ovfl = NULL;
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parents:
diff changeset
154 }
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
155 BUF_REMOVE(bp);
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parents:
diff changeset
156 free(bp->page);
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parents:
diff changeset
157 free(bp);
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parents:
diff changeset
158 return (NULL);
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parents:
diff changeset
159 }
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
160
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
161 if (!prev_bp)
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parents:
diff changeset
162 {
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
163 #if 0
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
164 /* 16 bit windows and mac can't handle the
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parents:
diff changeset
165 * oring of the is disk flag.
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parents:
diff changeset
166 */
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parents:
diff changeset
167 segp[segment_ndx] =
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diff changeset
168 (BUFHEAD *)((ptrdiff_t)bp | is_disk_mask);
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parents:
diff changeset
169 #else
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parents:
diff changeset
170 /* set the is_disk thing inside the structure
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parents:
diff changeset
171 */
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parents:
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172 bp->is_disk = is_disk_mask;
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173 segp[segment_ndx] = bp;
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parents:
diff changeset
174 #endif
150b72113545 Add DBM and legacydb support
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175 }
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parents:
diff changeset
176 } else {
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diff changeset
177 BUF_REMOVE(bp);
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diff changeset
178 MRU_INSERT(bp);
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diff changeset
179 }
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diff changeset
180 return (bp);
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parents:
diff changeset
181 }
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parents:
diff changeset
182
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parents:
diff changeset
183 /*
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parents:
diff changeset
184 * We need a buffer for this page. Either allocate one, or evict a resident
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parents:
diff changeset
185 * one (if we have as many buffers as we're allowed) and put this one in.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
186 *
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187 * If newbuf finds an error (returning NULL), it also sets errno.
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diff changeset
188 */
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parents:
diff changeset
189 static BUFHEAD *
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diff changeset
190 newbuf(HTAB *hashp, uint32 addr, BUFHEAD *prev_bp)
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
191 {
150b72113545 Add DBM and legacydb support
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diff changeset
192 register BUFHEAD *bp; /* The buffer we're going to use */
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parents:
diff changeset
193 register BUFHEAD *xbp; /* Temp pointer */
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parents:
diff changeset
194 register BUFHEAD *next_xbp;
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diff changeset
195 SEGMENT segp;
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diff changeset
196 int segment_ndx;
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diff changeset
197 uint16 oaddr, *shortp;
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parents:
diff changeset
198
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diff changeset
199 oaddr = 0;
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parents:
diff changeset
200 bp = LRU;
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parents:
diff changeset
201 /*
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parents:
diff changeset
202 * If LRU buffer is pinned, the buffer pool is too small. We need to
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
203 * allocate more buffers.
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
204 */
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parents:
diff changeset
205 if (hashp->nbufs || (bp->flags & BUF_PIN)) {
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parents:
diff changeset
206 /* Allocate a new one */
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parents:
diff changeset
207 if ((bp = (BUFHEAD *)malloc(sizeof(BUFHEAD))) == NULL)
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
208 return (NULL);
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parents:
diff changeset
209
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parents:
diff changeset
210 /* this memset is supposedly unnecessary but lets add
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
211 * it anyways.
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parents:
diff changeset
212 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
213 memset(bp, 0xff, sizeof(BUFHEAD));
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
214
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
215 if ((bp->page = (char *)malloc((size_t)hashp->BSIZE)) == NULL) {
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
216 free(bp);
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
217 return (NULL);
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parents:
diff changeset
218 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
219
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
220 /* this memset is supposedly unnecessary but lets add
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
221 * it anyways.
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
222 */
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
223 memset(bp->page, 0xff, (size_t)hashp->BSIZE);
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
224
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
225 if (hashp->nbufs)
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
226 hashp->nbufs--;
150b72113545 Add DBM and legacydb support
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parents:
diff changeset
227 } else {
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
228 /* Kick someone out */
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
229 BUF_REMOVE(bp);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
230 /*
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
231 * If this is an overflow page with addr 0, it's already been
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
232 * flushed back in an overflow chain and initialized.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
233 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
234 if ((bp->addr != 0) || (bp->flags & BUF_BUCKET)) {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
235 /*
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
236 * Set oaddr before __put_page so that you get it
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
237 * before bytes are swapped.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
238 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
239 shortp = (uint16 *)bp->page;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
240 if (shortp[0])
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
241 {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
242 if(shortp[0] > (hashp->BSIZE / sizeof(uint16)))
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
243 {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
244 return(NULL);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
245 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
246 oaddr = shortp[shortp[0] - 1];
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
247 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
248 if ((bp->flags & BUF_MOD) && __put_page(hashp, bp->page,
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
249 bp->addr, (int)IS_BUCKET(bp->flags), 0))
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
250 return (NULL);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
251 /*
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
252 * Update the pointer to this page (i.e. invalidate it).
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
253 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
254 * If this is a new file (i.e. we created it at open
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
255 * time), make sure that we mark pages which have been
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
256 * written to disk so we retrieve them from disk later,
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
257 * rather than allocating new pages.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
258 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
259 if (IS_BUCKET(bp->flags)) {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
260 segment_ndx = bp->addr & (hashp->SGSIZE - 1);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
261 segp = hashp->dir[bp->addr >> hashp->SSHIFT];
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
262 #ifdef DEBUG
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
263 assert(segp != NULL);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
264 #endif
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
265
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
266 if (hashp->new_file &&
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
267 ((bp->flags & BUF_MOD) ||
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
268 ISDISK(segp[segment_ndx])))
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
269 segp[segment_ndx] = (BUFHEAD *)BUF_DISK;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
270 else
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
271 segp[segment_ndx] = NULL;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
272 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
273 /*
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
274 * Since overflow pages can only be access by means of
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
275 * their bucket, free overflow pages associated with
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
276 * this bucket.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
277 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
278 for (xbp = bp; xbp->ovfl;) {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
279 next_xbp = xbp->ovfl;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
280 xbp->ovfl = 0;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
281 xbp = next_xbp;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
282
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
283 /* leave pinned pages alone, we are still using
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
284 * them. */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
285 if (xbp->flags & BUF_PIN) {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
286 continue;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
287 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
288
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
289 /* Check that ovfl pointer is up date. */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
290 if (IS_BUCKET(xbp->flags) ||
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
291 (oaddr != xbp->addr))
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
292 break;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
293
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
294 shortp = (uint16 *)xbp->page;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
295 if (shortp[0])
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296 {
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297 /* LJM is the number of reported
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298 * pages way too much?
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299 */
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300 if(shortp[0] > hashp->BSIZE/sizeof(uint16))
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301 return NULL;
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302 /* set before __put_page */
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303 oaddr = shortp[shortp[0] - 1];
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304 }
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305 if ((xbp->flags & BUF_MOD) && __put_page(hashp,
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306 xbp->page, xbp->addr, 0, 0))
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307 return (NULL);
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308 xbp->addr = 0;
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309 xbp->flags = 0;
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310 BUF_REMOVE(xbp);
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311 LRU_INSERT(xbp);
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312 }
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313 }
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314 }
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315
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316 /* Now assign this buffer */
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317 bp->addr = addr;
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318 #ifdef DEBUG1
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319 (void)fprintf(stderr, "NEWBUF1: %d->ovfl was %d is now %d\n",
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320 bp->addr, (bp->ovfl ? bp->ovfl->addr : 0), 0);
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321 #endif
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322 bp->ovfl = NULL;
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323 if (prev_bp) {
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324 /*
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325 * If prev_bp is set, this is an overflow page, hook it in to
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326 * the buffer overflow links.
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327 */
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328 #ifdef DEBUG1
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329 (void)fprintf(stderr, "NEWBUF2: %d->ovfl was %d is now %d\n",
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330 prev_bp->addr, (prev_bp->ovfl ? bp->ovfl->addr : 0),
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331 (bp ? bp->addr : 0));
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332 #endif
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333 prev_bp->ovfl = bp;
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334 bp->flags = 0;
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335 } else
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336 bp->flags = BUF_BUCKET;
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337 MRU_INSERT(bp);
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338 return (bp);
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339 }
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340
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341 extern void __buf_init(HTAB *hashp, int32 nbytes)
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342 {
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343 BUFHEAD *bfp;
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344 int npages;
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345
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346 bfp = &(hashp->bufhead);
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347 npages = (nbytes + hashp->BSIZE - 1) >> hashp->BSHIFT;
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348 npages = PR_MAX(npages, MIN_BUFFERS);
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349
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350 hashp->nbufs = npages;
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351 bfp->next = bfp;
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352 bfp->prev = bfp;
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353 /*
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354 * This space is calloc'd so these are already null.
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355 *
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356 * bfp->ovfl = NULL;
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357 * bfp->flags = 0;
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358 * bfp->page = NULL;
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359 * bfp->addr = 0;
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360 */
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361 }
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362
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363 extern int
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364 __buf_free(HTAB *hashp, int do_free, int to_disk)
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365 {
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366 BUFHEAD *bp;
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367 int status = -1;
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368
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369 /* Need to make sure that buffer manager has been initialized */
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diff changeset
370 if (!LRU)
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371 return (0);
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diff changeset
372 for (bp = LRU; bp != &hashp->bufhead;) {
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diff changeset
373 /* Check that the buffer is valid */
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diff changeset
374 if (bp->addr || IS_BUCKET(bp->flags)) {
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375 if (to_disk && (bp->flags & BUF_MOD) &&
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diff changeset
376 (status = __put_page(hashp, bp->page,
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diff changeset
377 bp->addr, IS_BUCKET(bp->flags), 0))) {
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diff changeset
378
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diff changeset
379 if (do_free) {
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diff changeset
380 if (bp->page)
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diff changeset
381 free(bp->page);
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diff changeset
382 BUF_REMOVE(bp);
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diff changeset
383 free(bp);
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diff changeset
384 }
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diff changeset
385
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diff changeset
386 return (status);
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parents:
diff changeset
387 }
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parents:
diff changeset
388 }
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
389 /* Check if we are freeing stuff */
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parents:
diff changeset
390 if (do_free) {
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parents:
diff changeset
391 if (bp->page)
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parents:
diff changeset
392 free(bp->page);
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parents:
diff changeset
393 BUF_REMOVE(bp);
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parents:
diff changeset
394 free(bp);
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parents:
diff changeset
395 bp = LRU;
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
396 } else
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parents:
diff changeset
397 bp = bp->prev;
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
398 }
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
399 return (0);
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parents:
diff changeset
400 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
401
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
402 extern void
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
403 __reclaim_buf(HTAB *hashp, BUFHEAD *bp)
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
404 {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
405 bp->ovfl = 0;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
406 bp->addr = 0;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
407 bp->flags = 0;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
408 BUF_REMOVE(bp);
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
409 LRU_INSERT(bp);
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
410 }
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