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Fix filesystem formatting.

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filesystem/call_development.rst
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@ -4,6 +4,3 @@ Command and Variable Index
########################## ##########################
There are currently no Command and Variable Index entries. There are currently no Command and Variable Index entries.
.. COMMENT: @printindex fn

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RTEMS Filesystem Design Guide RTEMS Filesystem Design Guide
============================= =============================
COPYRIGHT (c) 1988 - 2015. | COPYRIGHT (c) 1988 - 2015.
| On-Line Applications Research Corporation (OAR).
On-Line Applications Research Corporation (OAR). The authors have used their best efforts in preparing this material. These
efforts include the development, research, and testing of the theories and
programs to determine their effectiveness. No warranty of any kind, expressed
or implied, with regard to the software or the material contained in this
document is provided. No liability arising out of the application or use of
any product described in this document is assumed. The authors reserve the
right to revise this material and to make changes from time to time in the
content hereof without obligation to notify anyone of such revision or changes.
The authors have used their best efforts in preparing The RTEMS Project is hosted at http://www.rtems.org/. Any inquiries concerning
this material. These efforts include the development, research, RTEMS, its related support components, or its documentation should be directed
and testing of the theories and programs to determine their to the Community Project hosted at http://www.rtems.org/.
effectiveness. No warranty of any kind, expressed or implied,
with regard to the software or the material contained in this
document is provided. No liability arising out of the
application or use of any product described in this document is
assumed. The authors reserve the right to revise this material
and to make changes from time to time in the content hereof
without obligation to notify anyone of such revision or changes.
The RTEMS Project is hosted at http://www.rtems.org. Any .. topic:: RTEMS Online Resources
inquiries concerning RTEMS, its related support components, or its
documentation should be directed to the Community Project hosted athttp://www.rtems.org.
Any inquiries for commercial services including training, support, custom
development, application development assistance should be directed to http://www.rtems.com.
Table of Contents
-----------------
.. toctree::
preface
================ =============================
Home https://www.rtems.org/
Developers https://devel.rtems.org/
Documentation https://docs.rtems.org/
Bug Reporting https://devel.rtems.org/query
Mailing Lists https://lists.rtems.org/
Git Repositories https://git.rtems.org/
================ =============================
.. toctree:: .. toctree::
:maxdepth: 3 :maxdepth: 3
:numbered: :numbered:
preface
pathname_eval pathname_eval
system_init system_init
mounting_and_unmounting mounting_and_unmounting
@ -48,8 +45,6 @@ Table of Contents
minature_in-memory minature_in-memory
trivial_ftp trivial_ftp
command_and_variable command_and_variable
* :ref:`genindex` * :ref:`genindex`
* :ref:`search` * :ref:`search`

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filesystem/minature_in-memory.rst
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@ -1,18 +1,15 @@
.. comment SPDX-License-Identifier: CC-BY-SA-4.0 .. comment SPDX-License-Identifier: CC-BY-SA-4.0
.. COMMENT: COPYRIGHT (c) 1988-2002.
.. COMMENT: On-Line Applications Research Corporation (OAR).
.. COMMENT: All rights reserved.
Miniature In-Memory Filesystem Miniature In-Memory Filesystem
############################## ##############################
This chapter describes the Miniature In-Memory FileSystem (miniIMFS). This chapter describes the Miniature In-Memory FileSystem (miniIMFS). The
The miniIMFS is a reduced feature version of the IMFS designed to miniIMFS is a reduced feature version of the IMFS designed to provide minimal
provide minimal functionality and have a low memory footprint. functionality and have a low memory footprint.
This chapter should be written after the IMFS chapter is completed
and describe the implementation of the mini-IMFS.
.. COMMENT: COPYRIGHT (c) 1988-2002.
.. COMMENT: On-Line Applications Research Corporation (OAR).
.. COMMENT: All rights reserved.
This chapter should be written after the IMFS chapter is completed and describe
the implementation of the mini-IMFS.

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filesystem/mounting_and_unmounting.rst
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@ -1,5 +1,9 @@
.. comment SPDX-License-Identifier: CC-BY-SA-4.0 .. comment SPDX-License-Identifier: CC-BY-SA-4.0
.. COMMENT: COPYRIGHT (c) 1988-2002.
.. COMMENT: On-Line Applications Research Corporation (OAR).
.. COMMENT: All rights reserved.
Mounting and Unmounting Filesystems Mounting and Unmounting Filesystems
################################### ###################################
@ -8,46 +12,47 @@ Mount Points
The following is the list of the characteristics of a mount point: The following is the list of the characteristics of a mount point:
- The mount point must be a directory. It may have files and other - The mount point must be a directory. It may have files and other directories
directories under it. These files and directories will be hidden when the under it. These files and directories will be hidden when the filesystem is
filesystem is mounted. mounted.
- The task must have read/write/execute permissions to the mount point - The task must have read/write/execute permissions to the mount point or the
or the mount attempt will be rejected. mount attempt will be rejected.
- Only one filesystem can be mounted to a single mount point. - Only one filesystem can be mounted to a single mount point.
- The Root of the mountable filesystem will be referenced by the name - The Root of the mountable filesystem will be referenced by the name of the
of the mount point after the mount is complete. mount point after the mount is complete.
Mount Table Chain Mount Table Chain
================= =================
The mount table chain is a dynamic list of structures that describe The mount table chain is a dynamic list of structures that describe mounted
mounted filesystems a specific points in the filesystem hierarchy. It is filesystems a specific points in the filesystem hierarchy. It is initialized to
initialized to an empty state during the base filesystem initialization. an empty state during the base filesystem initialization. The mount operation
The mount operation will add entries to the mount table chain. The will add entries to the mount table chain. The un-mount operation will remove
un-mount operation will remove entries from the mount table chain. entries from the mount table chain.
Each entry in the mount table chain is of the following type: Each entry in the mount table chain is of the following type:
.. code:: c
.. code-block:: c
struct rtems_filesystem_mount_table_entry_tt struct rtems_filesystem_mount_table_entry_tt
{ {
Chain_Node Node; Chain_Node Node;
rtems_filesystem_location_info_t mt_point_node; rtems_filesystem_location_info_t mt_point_node;
rtems_filesystem_location_info_t mt_fs_root; rtems_filesystem_location_info_t mt_fs_root;
int options; int options;
void \*fs_info; void *fs_info;
rtems_filesystem_limits_and_options_t pathconf_limits_and_options; rtems_filesystem_limits_and_options_t pathconf_limits_and_options;
/* /*
* When someone adds a mounted filesystem on a real device, * When someone adds a mounted filesystem on a real device,
* this will need to be used. * this will need to be used.
* *
* The best option long term for this is probably an * The best option long term for this is probably an
* open file descriptor. * open file descriptor.
\*/ */
char \*dev; char \*dev;
}; };
*Node* *Node*
@ -57,15 +62,15 @@ Each entry in the mount table chain is of the following type:
The mt_point_node contains all information necessary to access the The mt_point_node contains all information necessary to access the
directory where a filesystem is mounted onto. This element may contain directory where a filesystem is mounted onto. This element may contain
memory that is allocated during a path evaluation of the filesystem memory that is allocated during a path evaluation of the filesystem
containing the mountpoint directory. The generic code allows this containing the mountpoint directory. The generic code allows this memory
memory to be returned by unmount when the filesystem identified by to be returned by unmount when the filesystem identified by mt_fs_root is
mt_fs_root is unmounted. unmounted.
*mt_fs_root* *mt_fs_root*
The mt_fs_root contains all information necessary to identify the root The mt_fs_root contains all information necessary to identify the root of
of the mounted filesystem. The user is never allowed access to this the mounted filesystem. The user is never allowed access to this node by
node by the generic code, but it is used to identify to the mounted the generic code, but it is used to identify to the mounted filesystem
filesystem where to start evaluation of pathnames at. where to start evaluation of pathnames at.
*options* *options*
XXX XXX
@ -74,7 +79,8 @@ Each entry in the mount table chain is of the following type:
The fs_info element is a location available for use by the mounted file The fs_info element is a location available for use by the mounted file
system to identify unique things applicable to this instance of the file system to identify unique things applicable to this instance of the file
system. For example the IMFS uses this space to provide node system. For example the IMFS uses this space to provide node
identification that is unique for each instance (mounting) of the filesystem. identification that is unique for each instance (mounting) of the
filesystem.
*pathconf_limits_and_options* *pathconf_limits_and_options*
XXX XXX
@ -85,20 +91,13 @@ Each entry in the mount table chain is of the following type:
Adding entries to the chain during mount Adding entries to the chain during mount
======================================== ========================================
When a filesystem is mounted, its presence and location in the file When a filesystem is mounted, its presence and location in the file system
system hierarchy is recorded in a dynamic list structure known as a chain. hierarchy is recorded in a dynamic list structure known as a chain. A unique
A unique rtems_filesystem_mount_table_entry_tt structure is logged for rtems_filesystem_mount_table_entry_tt structure is logged for each filesystem
each filesystem that is mounted. This includes the base filesystem. that is mounted. This includes the base filesystem.
Removing entries from the chain during unmount Removing entries from the chain during unmount
============================================== ==============================================
When a filesystem is dismounted its entry in the mount table chain is When a filesystem is dismounted its entry in the mount table chain is extracted
extracted and the memory for this entry is freed. and the memory for this entry is freed.
.. COMMENT: COPYRIGHT (c) 1988-2002.
.. COMMENT: On-Line Applications Research Corporation (OAR).
.. COMMENT: All rights reserved.

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filesystem/pathname_eval.rst
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@ -1,40 +1,44 @@
.. comment SPDX-License-Identifier: CC-BY-SA-4.0 .. comment SPDX-License-Identifier: CC-BY-SA-4.0
.. COMMENT: COPYRIGHT (c) 1988-2002.
.. COMMENT: On-Line Applications Research Corporation (OAR).
.. COMMENT: All rights reserved.
Pathname Evaluation Pathname Evaluation
################### ###################
This chapter describes the pathname evaluation process for the This chapter describes the pathname evaluation process for the RTEMS Filesystem
RTEMS Filesystem Infrastructure. Infrastructure.
.. code:: c
.. code-block:: shell
XXX Include graphic of the path evaluation process XXX Include graphic of the path evaluation process
Pathname Evaluation Handlers Pathname Evaluation Handlers
============================ ============================
There are two pathname evaluation routines. The handler patheval() There are two pathname evaluation routines. The handler patheval() is called
is called to find, verify privlages on and return information on a node to find, verify privlages on and return information on a node that exists. The
that exists. The handler evalformake() is called to find, verify handler ``evalformake()`` is called to find, verify permissions, and return
permissions, and return information on a node that is to become a parent. information on a node that is to become a parent. Additionally, evalformake()
Additionally, evalformake() returns a pointer to the start of the name of returns a pointer to the start of the name of the new node to be created.
the new node to be created.
Pathname evaluation is specific to a filesystem. Pathname evaluation is specific to a filesystem. Each filesystem is required
Each filesystem is required to provide both a patheval() and an evalformake() to provide both a ``patheval()`` and an ``evalformake()`` routine. Both of
routine. Both of these routines gets a name to evaluate and a node indicating these routines gets a name to evaluate and a node indicating where to start the
where to start the evaluation. evaluation.
Crossing a Mount Point During Path Evaluation Crossing a Mount Point During Path Evaluation
============================================= =============================================
If the filesystem supports the mount command, the evaluate routines If the filesystem supports the mount command, the evaluate routines must handle
must handle crossing the mountpoint. The evaluate routine should evaluate crossing the mountpoint. The evaluate routine should evaluate the name upto
the name upto the first directory node where the new filesystem is mounted. the first directory node where the new filesystem is mounted. The filesystem
The filesystem may process terminator characters prior to calling the may process terminator characters prior to calling the evaluate routine for the
evaluate routine for the new filesystem. A pointer to the portion of the new filesystem. A pointer to the portion of the name which has not been
name which has not been evaluated along with the root node of the new evaluated along with the root node of the new file system (gotten from the
file system ( gotten from the mount table entry ) is passed to the correct mount table entry) is passed to the correct mounted filesystem evaluate
mounted filesystem evaluate routine. routine.
The rtems_filesystem_location_info_t Structure The rtems_filesystem_location_info_t Structure
============================================== ==============================================
@ -43,55 +47,49 @@ The ``rtems_filesystem_location_info_t`` structure contains all information
necessary for identification of a node. necessary for identification of a node.
The generic rtems filesystem code defines two global The generic rtems filesystem code defines two global
rtems_filesystem_location_info_t structures, the``rtems_filesystem_root`` and the ``rtems_filesystem_current``. rtems_filesystem_location_info_t structures, the``rtems_filesystem_root`` and
Both are initially defined to be the root node of the base filesystem. the ``rtems_filesystem_current``. Both are initially defined to be the root
Once the chdir command is correctly used the ``rtems_filesystem_current`` node of the base filesystem. Once the chdir command is correctly used the
is set to the location specified by the command. ``rtems_filesystem_current`` is set to the location specified by the command.
The filesystem generic code peeks at the first character in the name to be The filesystem generic code peeks at the first character in the name to be
evaluated. If this character is a valid seperator, the``rtems_filesystem_root`` is used as the node to start the evaluation evaluated. If this character is a valid seperator,
with. Otherwise, the ``rtems_filesystem_current`` node is used as the the``rtems_filesystem_root`` is used as the node to start the evaluation with.
node to start evaluating with. Therefore, a valid Otherwise, the ``rtems_filesystem_current`` node is used as the node to start
rtems_filesystem_location_info_t is given to the evaluate routine to start evaluating with. Therefore, a valid rtems_filesystem_location_info_t is given
evaluation with. The evaluate routines are then responsible for making to the evaluate routine to start evaluation with. The evaluate routines are
any changes necessary to this structure to correspond to the name being then responsible for making any changes necessary to this structure to
parsed. correspond to the name being parsed.
.. code:: c
.. code-block:: c
struct rtems_filesystem_location_info_tt { struct rtems_filesystem_location_info_tt {
void \*node_access; void *node_access;
rtems_filesystem_file_handlers_r \*handlers; rtems_filesystem_file_handlers_r *handlers;
rtems_filesystem_operations_table \*ops; rtems_filesystem_operations_table *ops;
rtems_filesystem_mount_table_entry_t \*mt_entry; rtems_filesystem_mount_table_entry_t *mt_entry;
}; };
*node_access* *node_access*
This element is filesystem specific. A filesystem can define and store This element is filesystem specific. A filesystem can define and store any
any information necessary to identify a node at this location. This element information necessary to identify a node at this location. This element is
is normally filled in by the filesystem's evaluate routine. For the normally filled in by the filesystem's evaluate routine. For the
filesystem's root node, the filesystem's initilization routine should filesystem's root node, the filesystem's initilization routine should fill
fill this in, and it should remain valid until the instance of the this in, and it should remain valid until the instance of the filesystem is
filesystem is unmounted. unmounted.
*handlers* *handlers*
This element is defined as a set of routines that may change within a This element is defined as a set of routines that may change within a given
given filesystem based upon node type. For example a directory and a filesystem based upon node type. For example a directory and a memory file
memory file may have to completely different read routines. This element may have to completely different read routines. This element is set to an
is set to an initialization state defined by the mount table, and may initialization state defined by the mount table, and may be set to the
be set to the desired state by the evaluation routines. desired state by the evaluation routines.
*ops* *ops*
This element is defined as a set of routines that remain static for the This element is defined as a set of routines that remain static for the
filesystem. This element identifies entry points into the filesystem filesystem. This element identifies entry points into the filesystem to
to the generic code. the generic code.
*mt_entry* *mt_entry*
This element identifies the mount table entry for this instance of the This element identifies the mount table entry for this instance of the
filesystem. filesystem.
.. COMMENT: COPYRIGHT (c) 1988-2002.
.. COMMENT: On-Line Applications Research Corporation (OAR).
.. COMMENT: All rights reserved.

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@ -1,12 +1,15 @@
.. comment SPDX-License-Identifier: CC-BY-SA-4.0 .. comment SPDX-License-Identifier: CC-BY-SA-4.0
.. COMMENT: COPYRIGHT (c) 1988-2002.
.. COMMENT: On-Line Applications Research Corporation (OAR).
.. COMMENT: All rights reserved.
======= =======
Preface Preface
======= =======
This document describes the implementation of the RTEMS filesystem This document describes the implementation of the RTEMS filesystem
infrastructure. This infrastructure supports the following infrastructure. This infrastructure supports the following capabilities:
capabilities:
- Mountable file systems - Mountable file systems
@ -15,6 +18,7 @@ capabilities:
- POSIX compliant set of routines for the manipulation of files and directories - POSIX compliant set of routines for the manipulation of files and directories
- Individual file and directory support for the following: - Individual file and directory support for the following:
# Permissions for read, write and execute # Permissions for read, write and execute
# User ID # User ID
# Group ID # Group ID
@ -26,44 +30,34 @@ capabilities:
- Symbolic links to files and directories - Symbolic links to files and directories
This has been implemented to provide the framework for a UNIX-like This has been implemented to provide the framework for a UNIX-like file system
file system support. POSIX file and directory functions have been support. POSIX file and directory functions have been implemented that allow a
implemented that allow a standard method of accessing file, device and standard method of accessing file, device and directory information within file
directory information within file systems. The file system concept that systems. The file system concept that has been implemented allows for expansion
has been implemented allows for expansion and adaptation of the file and adaptation of the file system to a variety of existing and future data
system to a variety of existing and future data storage devices. To this storage devices. To this end, file system mount and unmount capabilities have
end, file system mount and unmount capabilities have been included in this been included in this RTEMS framework.
RTEMS framework.
This framework slightly alters the manner in which devices are handled This framework slightly alters the manner in which devices are handled under
under RTEMS from that of public release 4.0.0 and earlier. Devices that RTEMS from that of public release 4.0.0 and earlier. Devices that are defined
are defined under a given RTEMS configuration will now be registered as under a given RTEMS configuration will now be registered as files in a mounted
files in a mounted file system. Access to these device drivers and their file system. Access to these device drivers and their associated devices may
associated devices may now be performed through the traditional file system now be performed through the traditional file system open(), read(), write(),
open(), read(), write(), lseek(), fstat() and ioctl() functions in addition lseek(), fstat() and ioctl() functions in addition to the interface provided by
to the interface provided by the IO Manager in the RTEMS Classic API. the IO Manager in the RTEMS Classic API.
An In-Memory File System (IMFS) is included which provides full POSIX An In-Memory File System (IMFS) is included which provides full POSIX
filesystem functionality yet is RAM based. The IMFS maintains a filesystem functionality yet is RAM based. The IMFS maintains a node structure
node structure for each file, device, and directory in each mounted for each file, device, and directory in each mounted instantiation of its file
instantiation of its file system. The node structure is used to system. The node structure is used to manage ownership, access rights, access
manage ownership, access rights, access time, modification time, time, modification time, and creation time. A union of structures within the
and creation time. A union of structures within the IMFS nodal IMFS nodal structure provide for manipulation of file data, device selection,
structure provide for manipulation of file data, device selection, or directory content as required by the nodal type. Manipulation of these
or directory content as required by the nodal type. Manipulation of properties is accomplished through the POSIX set of file and directory
these properties is accomplished through the POSIX set of file and functions. In addition to being useful in its own right, the IMFS serves as a
directory functions. In addition to being useful in its own right, full featured example filesystem.
the IMFS serves as a full featured example filesystem.
The intended audience for this document is those persons implementing
their own filesystem. Users of the filesystem may find information
on the implementation useful. But the user interface to the filesystem
is through the ISO/ANSI C Library and POSIX 1003.1b file and directory
APIs.
.. COMMENT: COPYRIGHT (c) 1988-2002.
.. COMMENT: On-Line Applications Research Corporation (OAR).
.. COMMENT: All rights reserved.
The intended audience for this document is those persons implementing their own
filesystem. Users of the filesystem may find information on the implementation
useful. But the user interface to the filesystem is through the ISO/ANSI C
Library and POSIX 1003.1b file and directory APIs.

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filesystem/system_init.rst
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@ -1,30 +1,33 @@
.. comment SPDX-License-Identifier: CC-BY-SA-4.0 .. comment SPDX-License-Identifier: CC-BY-SA-4.0
.. COMMENT: COPYRIGHT (c) 1988-2002.
.. COMMENT: On-Line Applications Research Corporation (OAR).
.. COMMENT: All rights reserved.
System Initialization System Initialization
##################### #####################
After the RTEMS initialization is performed, the application's After the RTEMS initialization is performed, the application's initialization
initialization will be performed. Part of initialization is a call to will be performed. Part of initialization is a call to
rtems_filesystem_initialize(). This routine will mount the 'In Memory File ``rtems_filesystem_initialize()``. This routine will mount the 'In Memory File
System' as the base filesystem. Mounting the base filesystem consists System' as the base filesystem. Mounting the base filesystem consists of the
of the following: following:
- Initialization of mount table chain control structure - Initialization of mount table chain control structure
- Allocation of a ``jnode`` structure that will server as the root node - Allocation of a ``jnode`` structure that will server as the root node of the
of the 'In Memory Filesystem' 'In Memory Filesystem'
- Initialization of the allocated ``jnode`` with the appropriate OPS, - Initialization of the allocated ``jnode`` with the appropriate OPS, directory
directory handlers and pathconf limits and options. handlers and pathconf limits and options.
- Allocation of a memory region for filesystem specific global - Allocation of a memory region for filesystem specific global management
management variables variables
- Creation of first mount table entry for the base filesystem - Creation of first mount table entry for the base filesystem
- Initialization of the first mount table chain entry to indicate that - Initialization of the first mount table chain entry to indicate that the
the mount point is NULL and the mounted filesystem is the base file mount point is NULL and the mounted filesystem is the base file system
system
After the base filesystem has been mounted, the following operations are After the base filesystem has been mounted, the following operations are
performed under its directory structure: performed under its directory structure:
@ -38,10 +41,11 @@ Base Filesystem
RTEMS initially mounts a RAM based file system known as the base file system. RTEMS initially mounts a RAM based file system known as the base file system.
The root directory of this file system tree serves as the logical root of the The root directory of this file system tree serves as the logical root of the
directory hierarchy (Figure 3). Under the root directory a '/dev' directory directory hierarchy (Figure 3). Under the root directory a '/dev' directory is
is created under which all I/O device directories and files are registered as created under which all I/O device directories and files are registered as part
part of the file system hierarchy. of the file system hierarchy.
.. code:: c
.. code-block:: shell
Figure of the tree structure goes here. Figure of the tree structure goes here.
@ -65,37 +69,29 @@ Base Filesystem Mounting
At present, the first file system to be mounted is the 'In Memory File At present, the first file system to be mounted is the 'In Memory File
System'. It is mounted using a standard MOUNT() command in which the mount System'. It is mounted using a standard MOUNT() command in which the mount
point is NULL. This flags the mount as the first file system to be point is NULL. This flags the mount as the first file system to be registered
registered under the operating system and appropriate initialization of file under the operating system and appropriate initialization of file system
system management information is performed (See figures 4 and 5). If a management information is performed (See figures 4 and 5). If a different file
different file system type is desired as the base file system, alterations system type is desired as the base file system, alterations must be made to
must be made to base_fs.c. This routine handles the mount of the base file base_fs.c. This routine handles the mount of the base file system.
system.
.. code:: c .. code-block:: shell
Figure of the mount table chain goes here. Figure of the mount table chain goes here.
Once the root of the base file system has been established and it has been Once the root of the base file system has been established and it has been
recorded as the mount point of the base file system, devices are integrated recorded as the mount point of the base file system, devices are integrated
into the base file system. For every device that is configured into the into the base file system. For every device that is configured into the system
system (See ioman.c) a device registration process is performed. Device (See ioman.c) a device registration process is performed. Device registration
registration produces a unique dev_t handle that consists of a major and produces a unique dev_t handle that consists of a major and minor device
minor device number. In addition, the configuration information for each number. In addition, the configuration information for each device contains a
device contains a text string that represents the fully qualified pathname to text string that represents the fully qualified pathname to that device's place
that device's place in the base file system's hierarchy. A file system node in the base file system's hierarchy. A file system node is created for the
is created for the device along the specified registration path. device along the specified registration path.
.. code:: c .. code-block:: shell
Figure of the Mount Table Processing goes here. Figure of the Mount Table Processing goes here.
Note: Other file systems can be mounted but they are mounted onto points Note: Other file systems can be mounted but they are mounted onto points
(directory mount points) in the base file system. (directory mount points) in the base file system.
.. COMMENT: COPYRIGHT (c) 1988-2002.
.. COMMENT: On-Line Applications Research Corporation (OAR).
.. COMMENT: All rights reserved.

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@ -5,6 +5,5 @@ Trivial FTP Client Filesystem
This chapter describes the Trivial FTP (TFTP) Client Filesystem. This chapter describes the Trivial FTP (TFTP) Client Filesystem.
This chapter should be written after the IMFS chapter is completed This chapter should be written after the IMFS chapter is completed and describe
and describe the implementation of the TFTP. the implementation of the TFTP.