[07a3253d] | 1 | /* |
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| 2 | * mount() |
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| 3 | * |
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| 4 | * XXX |
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| 5 | * |
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| 6 | * XXX make sure no required ops are NULL |
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| 7 | * XXX make sure no optional ops you are using are NULL |
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| 8 | * XXX unmount should be required. |
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| 9 | * |
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| 10 | * COPYRIGHT (c) 1989-1998. |
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| 11 | * On-Line Applications Research Corporation (OAR). |
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| 12 | * Copyright assigned to U.S. Government, 1994. |
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| 13 | * |
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| 14 | * The license and distribution terms for this file may be |
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| 15 | * found in the file LICENSE in this distribution or at |
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| 16 | * http://www.OARcorp.com/rtems/license.html. |
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| 17 | * |
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| 18 | * $Id$ |
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| 19 | */ |
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| 20 | |
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| 21 | #include <sys/types.h> |
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| 22 | #include <sys/stat.h> |
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| 23 | #include <chain.h> |
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| 24 | #include <fcntl.h> |
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| 25 | #include <unistd.h> |
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| 26 | #include <errno.h> |
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| 27 | #include <stdlib.h> |
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| 28 | #include <string.h> |
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| 29 | #include <assert.h> |
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| 30 | |
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| 31 | #include "libio_.h" |
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| 32 | |
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| 33 | Chain_Control rtems_filesystem_mount_table_control; |
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| 34 | |
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| 35 | |
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| 36 | rtems_filesystem_limits_and_options_t IMFS_LIMITS_AND_OPTIONS = { |
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| 37 | 5, /* link_max */ |
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| 38 | 6, /* max_canon */ |
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| 39 | 7, /* max_input */ |
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| 40 | 255, /* name_max */ |
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| 41 | 255, /* path_max */ |
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| 42 | 2, /* pipe_buf */ |
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| 43 | 1, /* posix_async_io */ |
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| 44 | 2, /* posix_chown_restrictions */ |
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| 45 | 3, /* posix_no_trunc */ |
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| 46 | 4, /* posix_prio_io */ |
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| 47 | 5, /* posix_sync_io */ |
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| 48 | 6 /* posix_vdisable */ |
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| 49 | }; |
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| 50 | |
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| 51 | /* |
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| 52 | * XXX |
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| 53 | */ |
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| 54 | |
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| 55 | int search_mt_for_mount_point( |
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| 56 | rtems_filesystem_location_info_t *location_of_mount_point |
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| 57 | ); |
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| 58 | |
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| 59 | |
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| 60 | rtems_filesystem_options_t get_file_system_options( |
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| 61 | char *fsoptions |
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| 62 | ); |
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| 63 | |
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| 64 | int init_fs_mount_table( void ); |
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| 65 | |
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| 66 | |
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| 67 | /* |
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| 68 | * XXX |
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| 69 | */ |
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| 70 | |
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| 71 | #define FOUND 0 |
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| 72 | #define NOT_FOUND -1 |
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| 73 | |
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| 74 | /* |
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| 75 | * mount |
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| 76 | * |
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| 77 | * This routine will attempt to mount a new file system at the specified |
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| 78 | * mount point. A series of tests will be run to determine if any of the |
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| 79 | * following reasons exist to prevent the mount operation: |
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| 80 | * |
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| 81 | * 1) The file system type or options are not valid |
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| 82 | * 2) No new file system root node is specified |
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| 83 | * 3) The selected file system has already been mounted |
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| 84 | * 4) The mount point exists with the proper permissions to allow mounting |
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| 85 | * 5) The selected mount point already has a file system mounted to it |
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| 86 | * |
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| 87 | */ |
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| 88 | |
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| 89 | int mount( |
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| 90 | rtems_filesystem_mount_table_entry_t **mt_entry, |
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| 91 | rtems_filesystem_operations_table *fs_ops, |
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| 92 | char *fsoptions, |
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| 93 | char *device, |
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| 94 | char *mount_point |
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| 95 | ) |
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| 96 | { |
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| 97 | rtems_filesystem_location_info_t temp_loc; |
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| 98 | rtems_filesystem_options_t options; |
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| 99 | rtems_filesystem_mount_table_entry_t *temp_mt_entry; |
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| 100 | |
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| 101 | /* XXX add code to check for required operations */ |
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| 102 | |
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| 103 | /* |
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| 104 | * Are the file system options valid? |
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| 105 | */ |
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| 106 | |
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| 107 | options = get_file_system_options( fsoptions ); |
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| 108 | if ( options == RTEMS_FILESYSTEM_BAD_OPTIONS ){ |
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| 109 | errno = EINVAL; |
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| 110 | return -1; |
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| 111 | } |
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| 112 | |
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| 113 | /* |
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| 114 | * Is the file system type valid? |
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| 115 | */ |
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| 116 | |
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| 117 | if ( fs_ops == NULL ){ |
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| 118 | errno = EINVAL; |
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| 119 | return -1; |
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| 120 | } |
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| 121 | |
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| 122 | /* |
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| 123 | * Allocate a mount table entry |
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| 124 | */ |
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| 125 | |
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| 126 | temp_mt_entry = malloc( sizeof(rtems_filesystem_mount_table_entry_t) ); |
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| 127 | |
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| 128 | temp_mt_entry->mt_fs_root.mt_entry = temp_mt_entry; |
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| 129 | temp_mt_entry->options = options; |
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| 130 | if( device ) |
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| 131 | sprintf( temp_mt_entry->dev, "%s", device ); |
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| 132 | else |
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| 133 | temp_mt_entry->dev = 0; |
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| 134 | |
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| 135 | /* |
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| 136 | * The mount_point should be a directory with read/write/execute |
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| 137 | * permissions in the existing tree. |
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| 138 | */ |
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| 139 | |
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| 140 | if ( mount_point ) { |
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| 141 | if ( rtems_filesystem_evaluate_path( |
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| 142 | mount_point, |
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| 143 | RTEMS_LIBIO_PERMS_RWX, |
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| 144 | &temp_loc , |
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| 145 | TRUE ) == -1 ) |
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| 146 | goto cleanup_and_bail; |
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| 147 | |
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| 148 | /* |
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| 149 | * Test to see if it is a directory |
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| 150 | */ |
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| 151 | |
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| 152 | if ( temp_loc.ops->node_type( &temp_loc ) != RTEMS_FILESYSTEM_DIRECTORY ){ |
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| 153 | errno = ENOTDIR; |
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| 154 | goto cleanup_and_bail; |
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| 155 | } |
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| 156 | |
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| 157 | /* |
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| 158 | * You can only mount one file system onto a single mount point. |
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| 159 | */ |
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| 160 | |
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| 161 | if ( search_mt_for_mount_point( &temp_loc ) == FOUND ){ |
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| 162 | errno = EBUSY; |
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| 163 | goto cleanup_and_bail; |
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| 164 | } |
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| 165 | |
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| 166 | /* |
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| 167 | * This must be a good mount point, so move the location information |
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| 168 | * into the allocated mount entry |
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| 169 | */ |
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| 170 | |
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| 171 | temp_mt_entry->mt_point_node.node_access = temp_loc.node_access; |
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| 172 | temp_mt_entry->mt_point_node.handlers = temp_loc.handlers; |
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| 173 | temp_mt_entry->mt_point_node.ops = temp_loc.ops; |
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| 174 | temp_mt_entry->mt_point_node.mt_entry = temp_loc.mt_entry; |
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| 175 | |
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| 176 | /* |
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| 177 | * This link to the parent is only done when we are dealing with system |
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| 178 | * below the base file system |
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| 179 | */ |
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| 180 | |
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| 181 | if ( !temp_loc.ops->mount ){ |
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| 182 | errno = ENOTSUP; |
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| 183 | goto cleanup_and_bail; |
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| 184 | } |
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| 185 | |
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| 186 | if ( temp_loc.ops->mount( temp_mt_entry ) ) { |
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| 187 | goto cleanup_and_bail; |
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| 188 | } |
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| 189 | } |
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| 190 | else { |
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| 191 | |
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| 192 | /* |
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| 193 | * This is a mount of the base file system --> The |
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| 194 | * mt_point_node.node_access will be set to null to indicate that this |
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| 195 | * is the root of the entire file system. |
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| 196 | */ |
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| 197 | |
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| 198 | temp_mt_entry->mt_fs_root.node_access = NULL; |
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| 199 | temp_mt_entry->mt_fs_root.handlers = NULL; |
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| 200 | temp_mt_entry->mt_fs_root.ops = NULL; |
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| 201 | |
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| 202 | temp_mt_entry->mt_point_node.node_access = NULL; |
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| 203 | temp_mt_entry->mt_point_node.handlers = NULL; |
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| 204 | temp_mt_entry->mt_point_node.ops = NULL; |
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| 205 | temp_mt_entry->mt_point_node.mt_entry = NULL; |
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| 206 | } |
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| 207 | |
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| 208 | if ( !fs_ops->fsmount_me ){ |
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| 209 | errno = ENOTSUP; |
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| 210 | goto cleanup_and_bail; |
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| 211 | } |
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| 212 | |
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| 213 | if ( fs_ops->fsmount_me( temp_mt_entry ) ) |
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| 214 | goto cleanup_and_bail; |
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| 215 | |
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| 216 | /* |
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| 217 | * Add the mount table entry to the mount table chain |
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| 218 | */ |
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| 219 | |
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| 220 | Chain_Append( &rtems_filesystem_mount_table_control, &temp_mt_entry->Node ); |
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| 221 | |
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| 222 | *mt_entry = temp_mt_entry; |
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| 223 | return 0; |
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| 224 | |
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| 225 | cleanup_and_bail: |
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| 226 | |
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| 227 | free( temp_mt_entry ); |
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| 228 | return -1; |
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| 229 | } |
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| 230 | |
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| 231 | |
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| 232 | |
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| 233 | /* |
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| 234 | * init_fs_mount_table |
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| 235 | * |
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| 236 | * This routine will initialize the chain control element that manages the |
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| 237 | * mount table chain. |
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| 238 | */ |
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| 239 | |
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| 240 | int init_fs_mount_table() |
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| 241 | { |
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| 242 | Chain_Initialize_empty ( &rtems_filesystem_mount_table_control ); |
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| 243 | return 0; |
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| 244 | } |
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| 245 | |
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| 246 | /* |
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| 247 | * get_file_system_options |
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| 248 | * |
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| 249 | * This routine will determine is the text string that represents the options |
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| 250 | * that are to be used to mount the file system are actually valid. If the |
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| 251 | * options are valid the appropriate file system options type will be returned |
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| 252 | * to the calling routine. |
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| 253 | */ |
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| 254 | |
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| 255 | rtems_filesystem_options_t get_file_system_options( |
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| 256 | char *fsoptions |
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| 257 | ) |
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| 258 | { |
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| 259 | if ( strcmp( "RO", strupr( fsoptions ) ) == 0 ) |
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| 260 | return RTEMS_FILESYSTEM_READ_ONLY; |
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| 261 | if ( strcmp( "RW", strupr( fsoptions ) ) == 0 ) |
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| 262 | return RTEMS_FILESYSTEM_READ_WRITE_ONLY; |
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| 263 | else |
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| 264 | return RTEMS_FILESYSTEM_BAD_OPTIONS; |
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| 265 | } |
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| 266 | |
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| 267 | |
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| 268 | |
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| 269 | /* |
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| 270 | * search_mt_for_mount_point |
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| 271 | * |
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| 272 | * This routine will run through the entries that currently exist in the |
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| 273 | * mount table chain. For each entry in the mount table chain it will |
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| 274 | * compare the mount tables mt_point_node to the node describing the selected |
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| 275 | * mount point.. If any of the mount table file system mount point nodes |
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| 276 | * match the new file system selected mount point node, we are attempting |
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| 277 | * to mount the new file system onto a node that already has a file system |
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| 278 | * mounted to it. This is not a permitted operation. |
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| 279 | */ |
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| 280 | |
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| 281 | int search_mt_for_mount_point( |
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| 282 | rtems_filesystem_location_info_t *location_of_mount_point |
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| 283 | ) |
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| 284 | { |
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| 285 | Chain_Node *the_node; |
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| 286 | rtems_filesystem_mount_table_entry_t *the_mount_entry; |
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| 287 | |
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| 288 | for ( the_node = rtems_filesystem_mount_table_control.first; |
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| 289 | !Chain_Is_tail( &rtems_filesystem_mount_table_control, the_node ); |
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| 290 | the_node = the_node->next ) { |
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| 291 | |
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| 292 | the_mount_entry = (rtems_filesystem_mount_table_entry_t *) the_node; |
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| 293 | if ( the_mount_entry->mt_point_node.node_access == |
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| 294 | location_of_mount_point->node_access ) |
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| 295 | return FOUND; |
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| 296 | } |
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| 297 | return NOT_FOUND; |
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| 298 | } |
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| 299 | |
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