source: rtems/cpukit/libcsupport/src/__usrenv.c @ da154e14

4.11
Last change on this file since da154e14 was da154e14, checked in by Sebastian Huber <sebastian.huber@…>, on May 14, 2012 at 2:55:41 PM

Filesystem: Move operations to mount table entry

The scope of the file system operations is the file system instance.
The scope of the file system node handlers is the file location. The
benefit of moving the operations to the mount table entry is a size
reduction of the file location (rtems_filesystem_location_info_t). The
code size is slightly increased due to additional load instructions.

Restructure rtems_filesystem_mount_table_entry_t to improve cache
efficiency.

  • Property mode set to 100644
File size: 5.6 KB
Line 
1/*
2 *  COPYRIGHT (c) 1989-2008.
3 *  On-Line Applications Research Corporation (OAR).
4 *
5 *  Modifications to support reference counting in the file system are
6 *  Copyright (c) 2012 embedded brains GmbH.
7 *
8 *  The license and distribution terms for this file may be
9 *  found in the file LICENSE in this distribution or at
10 *  http://www.rtems.com/license/LICENSE.
11 */
12
13#if HAVE_CONFIG_H
14  #include "config.h"
15#endif
16
17#include <sys/stat.h>
18
19#include <rtems/libio_.h>
20
21static int null_handler_open(
22  rtems_libio_t *iop,
23  const char *path,
24  int oflag,
25  mode_t mode
26)
27{
28  return -1;
29}
30
31static int null_handler_fstat(
32  const rtems_filesystem_location_info_t *pathloc,
33  struct stat *buf
34)
35{
36  return -1;
37}
38
39const rtems_filesystem_file_handlers_r rtems_filesystem_null_handlers = {
40  .open_h = null_handler_open,
41  .close_h = rtems_filesystem_default_close,
42  .read_h = rtems_filesystem_default_read,
43  .write_h = rtems_filesystem_default_write,
44  .ioctl_h = rtems_filesystem_default_ioctl,
45  .lseek_h = rtems_filesystem_default_lseek,
46  .fstat_h = null_handler_fstat,
47  .ftruncate_h = rtems_filesystem_default_ftruncate,
48  .fsync_h = rtems_filesystem_default_fsync_or_fdatasync,
49  .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync,
50  .fcntl_h = rtems_filesystem_default_fcntl
51};
52
53static void null_op_lock_or_unlock(
54  const rtems_filesystem_mount_table_entry_t *mt_entry
55)
56{
57  /* Do nothing */
58}
59
60static int null_op_mknod(
61  const rtems_filesystem_location_info_t *parentloc,
62  const char *name,
63  size_t namelen,
64  mode_t mode,
65  dev_t dev
66)
67{
68  return -1;
69}
70
71static int null_op_rmnod(
72  const rtems_filesystem_location_info_t *parentloc,
73  const rtems_filesystem_location_info_t *loc
74)
75{
76  return -1;
77}
78
79static int null_op_link(
80  const rtems_filesystem_location_info_t *parentloc,
81  const rtems_filesystem_location_info_t *targetloc,
82  const char *name,
83  size_t namelen
84)
85{
86  return -1;
87}
88
89static int null_op_fchmod(
90  const rtems_filesystem_location_info_t *pathloc,
91  mode_t mode
92)
93{
94  return -1;
95}
96
97static int null_op_chown(
98  const rtems_filesystem_location_info_t *loc,
99  uid_t owner,
100  gid_t group
101)
102{
103  return -1;
104}
105
106static int null_op_clonenode(
107  rtems_filesystem_location_info_t *loc
108)
109{
110  return -1;
111}
112
113static int null_op_mount(
114  rtems_filesystem_mount_table_entry_t *mt_entry
115)
116{
117  return -1;
118}
119
120static int null_op_fsmount_me(
121  rtems_filesystem_mount_table_entry_t *mt_entry,
122  const void *data
123)
124{
125  return -1;
126}
127
128static int null_op_unmount(
129  rtems_filesystem_mount_table_entry_t *mt_entry
130)
131{
132  return -1;
133}
134
135static void null_op_fsunmount_me(
136  rtems_filesystem_mount_table_entry_t *mt_entry
137)
138{
139  /* Do nothing */
140}
141
142static int null_op_utime(
143  const rtems_filesystem_location_info_t *loc,
144  time_t actime,
145  time_t modtime
146)
147{
148  return -1;
149}
150
151static int null_op_symlink(
152  const rtems_filesystem_location_info_t *parentloc,
153  const char *name,
154  size_t namelen,
155  const char *target
156)
157{
158  return -1;
159}
160
161static ssize_t null_op_readlink(
162  const rtems_filesystem_location_info_t *loc,
163  char *buf,
164  size_t bufsize
165)
166{
167  return -1;
168}
169
170static int null_op_rename(
171  const rtems_filesystem_location_info_t *oldparentloc,
172  const rtems_filesystem_location_info_t *oldloc,
173  const rtems_filesystem_location_info_t *newparentloc,
174  const char *name,
175  size_t namelen
176)
177{
178  return -1;
179}
180
181static int null_op_statvfs(
182  const rtems_filesystem_location_info_t *loc,
183  struct statvfs *buf
184)
185{
186  return -1;
187}
188
189static const rtems_filesystem_operations_table null_ops = {
190  .lock_h = null_op_lock_or_unlock,
191  .unlock_h = null_op_lock_or_unlock,
192  .eval_path_h = rtems_filesystem_default_eval_path,
193  .link_h = null_op_link,
194  .are_nodes_equal_h = rtems_filesystem_default_are_nodes_equal,
195  .node_type_h = rtems_filesystem_default_node_type,
196  .mknod_h = null_op_mknod,
197  .rmnod_h = null_op_rmnod,
198  .fchmod_h = null_op_fchmod,
199  .chown_h = null_op_chown,
200  .clonenod_h = null_op_clonenode,
201  .freenod_h = rtems_filesystem_default_freenode,
202  .mount_h = null_op_mount,
203  .fsmount_me_h = null_op_fsmount_me,
204  .unmount_h = null_op_unmount,
205  .fsunmount_me_h = null_op_fsunmount_me,
206  .utime_h = null_op_utime,
207  .symlink_h = null_op_symlink,
208  .readlink_h = null_op_readlink,
209  .rename_h = null_op_rename,
210  .statvfs_h = null_op_statvfs
211};
212
213rtems_filesystem_mount_table_entry_t rtems_filesystem_null_mt_entry = {
214  .location_chain = {
215    .Head = {
216      .Node = {
217        .next = &rtems_filesystem_global_location_null.location.mt_entry_node,
218        .previous = NULL
219      },
220      .fill = &rtems_filesystem_global_location_null.location.mt_entry_node,
221    }
222  },
223  .ops = &null_ops,
224  .mt_point_node = &rtems_filesystem_global_location_null,
225  .mt_fs_root = &rtems_filesystem_global_location_null,
226  .mounted = false,
227  .writeable = false
228};
229
230rtems_filesystem_global_location_t rtems_filesystem_global_location_null = {
231  .location = {
232    .mt_entry_node = {
233      .next = &rtems_filesystem_null_mt_entry.location_chain.Tail.Node,
234      .previous = &rtems_filesystem_null_mt_entry.location_chain.Head.Node
235    },
236    .handlers = &rtems_filesystem_null_handlers,
237    .mt_entry = &rtems_filesystem_null_mt_entry
238  },
239
240  /*
241   * The initial reference count accounts for the following references
242   *  o the root directory of the user environment,
243   *  o the current directory of the user environment,
244   *  o the root node of the null file system instance, and
245   *  o the mount point node of the null file system instance.
246   */
247  .reference_count = 4
248};
249
250rtems_user_env_t rtems_global_user_env = {
251  .current_directory = &rtems_filesystem_global_location_null,
252  .root_directory = &rtems_filesystem_global_location_null,
253  .umask = S_IWGRP | S_IWOTH
254};
255
256rtems_user_env_t *rtems_current_user_env = &rtems_global_user_env;
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