src/server/plugins/postgresql/vfs.c

Fri, 28 Jan 2022 16:01:05 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Fri, 28 Jan 2022 16:01:05 +0100
branch
webdav
changeset 277
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parent 276
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child 278
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permissions
-rw-r--r--

add support for vfsclass parameter in nametrans safs

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2022 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include "vfs.h"
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30
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31 static VFS pg_vfs_class = {
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32 pg_vfs_open,
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33 pg_vfs_stat,
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34 pg_vfs_fstat,
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35 pg_vfs_opendir,
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36 pg_vfs_fdopendir,
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37 pg_vfs_mkdir,
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38 pg_vfs_unlink,
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39 pg_vfs_rmdir
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40 };
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41
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42 static VFS_IO pg_vfs_io_class = {
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43 pg_vfs_io_read,
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44 pg_vfs_io_write,
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45 pg_vfs_io_pread,
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46 pg_vfs_io_pwrite,
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47 pg_vfs_io_seek,
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48 pg_vfs_io_close,
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49 NULL, // no pg aio implementation yet
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50 NULL
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51 };
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52
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53 static VFS_DIRIO pg_vfs_dirio_class = {
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54 pg_vfs_dirio_readdir,
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55 pg_vfs_dirio_close
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56 };
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57
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58
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59
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60 VFS* pg_vfs_create(Session *sn, Request *rq, pblock *pb) {
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61 // resourcepool is required
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62 char *resource_pool = pblock_find("resourcepool", pb);
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63 if(!resource_pool) {
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64 log_ereport(LOG_MISCONFIG, "pg_vfs_create: missing resourcepool parameter");
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65 return NULL;
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66 }
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67
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68 // get the resource first (most likely to fail due to misconfig)
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69 ResourceData *resdata = resourcepool_lookup(sn, rq, resource_pool, 0);
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70 if(!resdata) {
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71 log_ereport(LOG_MISCONFIG, "postgresql vfs: resource pool %s not found", resource_pool);
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72 return NULL;
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73 }
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74 // resdata will be freed automatically when the request is finished
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75
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76 // Create a new VFS object and a separate instance object
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77 // VFS contains fptrs that can be copied from pg_vfs_class
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78 // instance contains request specific data (PGconn)
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79 VFS *vfs = pool_malloc(sn->pool, sizeof(VFS));
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80 if(!vfs) {
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81 return NULL;
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82 }
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83
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84 PgVFS *vfs_priv = pool_malloc(sn->pool, sizeof(PgVFS));
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85 if(!vfs_priv) {
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86 pool_free(sn->pool, vfs);
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87 return NULL;
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88 }
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89
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90 memcpy(vfs, &pg_vfs_class, sizeof(VFS));
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91 vfs->flags = 0;
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92 vfs->instance = vfs_priv;
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93
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94 return vfs;
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95 }
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97
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98 /* -------------------------- VFS functions -------------------------- */
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99
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100 SYS_FILE pg_vfs_open(VFSContext *ctx, const char *path, int oflags) {
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101
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102 }
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103
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104 int pg_vfs_stat(VFSContext *ctx, const char *path, struct stat *buf) {
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105
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106 }
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107
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108 int pg_vfs_fstat(VFSContext *ctx, SYS_FILE fd, struct stat *buf) {
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109
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110 }
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111
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112 VFS_DIR pg_vfs_opendir(VFSContext *ctx, const char *path) {
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113
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114 }
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115
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116 VFS_DIR pg_vfs_fdopendir(VFSContext *ctx, SYS_FILE fd) {
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117
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118 }
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119
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120 int pg_vfs_mkdir(VFSContext *ctx, const char *path) {
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121
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122 }
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123
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124 int pg_vfs_unlink(VFSContext *ctx, const char *path) {
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125
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126 }
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127
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128 int pg_vfs_rmdir(VFSContext *Ctx, const char *path) {
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129
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130 }
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131
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132
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133 /* -------------------------- VFS_IO functions -------------------------- */
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134
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135 ssize_t pg_vfs_io_read(SYS_FILE fd, void *buf, size_t nbyte) {
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136
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137 }
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138
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139 ssize_t pg_vfs_io_write(SYS_FILE fd, const void *buf, size_t nbyte) {
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140
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141 }
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142
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143 ssize_t pg_vfs_io_pread(SYS_FILE fd, void *buf, size_t nbyte, off_t offset) {
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145 }
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147 ssize_t pg_vfs_io_pwrite(SYS_FILE fd, const void *buf, size_t nbyte, off_t offset) {
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149 }
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150
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151 off_t pg_vfs_io_seek(SYS_FILE fd, off_t offset, int whence) {
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153 }
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154
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155 void pg_vfs_io_close(SYS_FILE fd) {
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156
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157 }
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158
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159
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160 /* -------------------------- VFS_DIRIO functions -------------------------- */
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161
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162 int pg_vfs_dirio_readdir(VFS_DIR dir, VFS_ENTRY *entry, int getstat) {
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164 }
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165
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166 void pg_vfs_dirio_close(VFS_DIR dir) {
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167
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168 }

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