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Sebastian Huber
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c-user/config/filesystem.rst
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c-user/config/filesystem.rst
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.. SPDX-License-Identifier: CC-BY-SA-4.0
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.. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
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Filesystem Configuration
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========================
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By default, the In-Memory Filesystem (IMFS) is used as the base filesystem (also
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known as root filesystem). In order to save some memory for your application,
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you can disable the filesystem support with the
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:ref:`CONFIGURE_APPLICATION_DISABLE_FILESYSTEM` configuration option.
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Alternatively, you can strip down the features of the base filesystem with the
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:ref:`CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM` and
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:ref:`CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM` configuration options. These
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three configuration options are mutually exclusive. They are intended for an
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advanced application configuration.
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Features of the IMFS can be disabled and enabled with the following
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configuration options:
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* :ref:`CONFIGURE_IMFS_DISABLE_CHMOD`
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* :ref:`CONFIGURE_IMFS_DISABLE_CHOWN`
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* :ref:`CONFIGURE_IMFS_DISABLE_LINK`
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* :ref:`CONFIGURE_IMFS_DISABLE_MKNOD`
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* :ref:`CONFIGURE_IMFS_DISABLE_MKNOD_FILE`
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* :ref:`CONFIGURE_IMFS_DISABLE_MOUNT`
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* :ref:`CONFIGURE_IMFS_DISABLE_READDIR`
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* :ref:`CONFIGURE_IMFS_DISABLE_READLINK`
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* :ref:`CONFIGURE_IMFS_DISABLE_RENAME`
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* :ref:`CONFIGURE_IMFS_DISABLE_RMNOD`
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* :ref:`CONFIGURE_IMFS_DISABLE_SYMLINK`
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* :ref:`CONFIGURE_IMFS_DISABLE_UNMOUNT`
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* :ref:`CONFIGURE_IMFS_DISABLE_UTIME`
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* :ref:`CONFIGURE_IMFS_ENABLE_MKFIFO`
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.. index:: CONFIGURE_APPLICATION_DISABLE_FILESYSTEM
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.. _CONFIGURE_APPLICATION_DISABLE_FILESYSTEM:
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CONFIGURE_APPLICATION_DISABLE_FILESYSTEM
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----------------------------------------
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CONSTANT:
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``CONFIGURE_APPLICATION_DISABLE_FILESYSTEM``
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DATA TYPE:
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Boolean feature macro.
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RANGE:
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Defined or undefined.
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DEFAULT VALUE:
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This is not defined by default. If no other root file system configuration
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parameters are specified, the IMFS will be used as the root file system.
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DESCRIPTION:
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This configuration parameter is defined if the application dose not intend
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to use any kind of filesystem support. This include the device
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infrastructure necessary to support ``printf()``.
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NOTES:
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None.
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.. index:: CONFIGURE_IMFS_ENABLE_MKFIFO
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.. _CONFIGURE_IMFS_ENABLE_MKFIFO:
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CONFIGURE_IMFS_ENABLE_MKFIFO
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----------------------------
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CONSTANT:
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``CONFIGURE_IMFS_ENABLE_MKFIFO``
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DATA TYPE:
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Boolean feature macro.
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RANGE:
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Defined or undefined.
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DEFAULT VALUE:
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This is not defined by default.
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DESCRIPTION:
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In case this configuration option is defined, then the support to make FIFOs
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is enabled in the root IMFS.
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.. index:: CONFIGURE_IMFS_DISABLE_CHMOD
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.. _CONFIGURE_IMFS_DISABLE_CHMOD:
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CONFIGURE_IMFS_DISABLE_CHMOD
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----------------------------
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CONSTANT:
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``CONFIGURE_IMFS_DISABLE_CHMOD``
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DATA TYPE:
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Boolean feature macro.
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RANGE:
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Defined or undefined.
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DEFAULT VALUE:
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This is not defined by default.
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DESCRIPTION:
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In case this configuration option is defined, then the support to change
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the mode is disabled in the root IMFS.
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.. index:: CONFIGURE_IMFS_DISABLE_CHOWN
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.. _CONFIGURE_IMFS_DISABLE_CHOWN:
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CONFIGURE_IMFS_DISABLE_CHOWN
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----------------------------
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CONSTANT:
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``CONFIGURE_IMFS_DISABLE_CHOWN``
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DATA TYPE:
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Boolean feature macro.
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RANGE:
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Defined or undefined.
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DEFAULT VALUE:
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This is not defined by default.
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DESCRIPTION:
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In case this configuration option is defined, then the support to change
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the owner is disabled in the root IMFS.
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.. index:: CONFIGURE_IMFS_DISABLE_LINK
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.. _CONFIGURE_IMFS_DISABLE_LINK:
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CONFIGURE_IMFS_DISABLE_LINK
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---------------------------
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CONSTANT:
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``CONFIGURE_IMFS_DISABLE_LINK``
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DATA TYPE:
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Boolean feature macro.
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RANGE:
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Defined or undefined.
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DEFAULT VALUE:
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This is not defined by default.
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DESCRIPTION:
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In case this configuration option is defined, then the support to create
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hard links is disabled in the root IMFS.
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.. index:: CONFIGURE_IMFS_DISABLE_MKNOD
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.. _CONFIGURE_IMFS_DISABLE_MKNOD:
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CONFIGURE_IMFS_DISABLE_MKNOD
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----------------------------
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CONSTANT:
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``CONFIGURE_IMFS_DISABLE_MKNOD``
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DATA TYPE:
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Boolean feature macro.
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RANGE:
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Defined or undefined.
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DEFAULT VALUE:
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This is not defined by default.
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DESCRIPTION:
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In case this configuration option is defined, then the support to make
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directories, devices, regular files and FIFOs is disabled in the root IMFS.
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.. index:: CONFIGURE_IMFS_DISABLE_MKNOD_FILE
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.. _CONFIGURE_IMFS_DISABLE_MKNOD_FILE:
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CONFIGURE_IMFS_DISABLE_MKNOD_FILE
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---------------------------------
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CONSTANT:
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``CONFIGURE_IMFS_DISABLE_MKNOD_FILE``
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DATA TYPE:
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Boolean feature macro.
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RANGE:
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Defined or undefined.
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DEFAULT VALUE:
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This is not defined by default.
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DESCRIPTION:
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In case this configuration option is defined, then the support to make
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regular files is disabled in the root IMFS.
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.. index:: CONFIGURE_IMFS_DISABLE_MOUNT
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.. _CONFIGURE_IMFS_DISABLE_MOUNT:
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CONFIGURE_IMFS_DISABLE_MOUNT
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----------------------------
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CONSTANT:
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``CONFIGURE_IMFS_DISABLE_MOUNT``
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DATA TYPE:
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Boolean feature macro.
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RANGE:
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Defined or undefined.
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DEFAULT VALUE:
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This is not defined by default.
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DESCRIPTION:
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In case this configuration option is defined, then the support to mount
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other file systems is disabled in the root IMFS.
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.. index:: CONFIGURE_IMFS_DISABLE_READDIR
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.. _CONFIGURE_IMFS_DISABLE_READDIR:
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CONFIGURE_IMFS_DISABLE_READDIR
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------------------------------
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CONSTANT:
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``CONFIGURE_IMFS_DISABLE_READDIR``
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DATA TYPE:
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Boolean feature macro.
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RANGE:
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Defined or undefined.
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DEFAULT VALUE:
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This is not defined by default.
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DESCRIPTION:
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In case this configuration option is defined, then the support to read a
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directory is disabled in the root IMFS. It is still possible to open nodes
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in a directory.
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.. index:: CONFIGURE_IMFS_DISABLE_READLINK
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.. _CONFIGURE_IMFS_DISABLE_READLINK:
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CONFIGURE_IMFS_DISABLE_READLINK
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-------------------------------
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CONSTANT:
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``CONFIGURE_IMFS_DISABLE_READLINK``
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DATA TYPE:
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Boolean feature macro.
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RANGE:
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Defined or undefined.
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DEFAULT VALUE:
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This is not defined by default.
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DESCRIPTION:
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In case this configuration option is defined, then the support to read
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symbolic links is disabled in the root IMFS.
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.. index:: CONFIGURE_IMFS_DISABLE_RENAME
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.. _CONFIGURE_IMFS_DISABLE_RENAME:
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CONFIGURE_IMFS_DISABLE_RENAME
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-----------------------------
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CONSTANT:
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``CONFIGURE_IMFS_DISABLE_RENAME``
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DATA TYPE:
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Boolean feature macro.
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RANGE:
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Defined or undefined.
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|
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DEFAULT VALUE:
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This is not defined by default.
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DESCRIPTION:
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In case this configuration option is defined, then the support to rename
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nodes is disabled in the root IMFS.
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.. index:: CONFIGURE_IMFS_DISABLE_RMNOD
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.. _CONFIGURE_IMFS_DISABLE_RMNOD:
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CONFIGURE_IMFS_DISABLE_RMNOD
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----------------------------
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CONSTANT:
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``CONFIGURE_IMFS_DISABLE_RMNOD``
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DATA TYPE:
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Boolean feature macro.
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RANGE:
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Defined or undefined.
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DEFAULT VALUE:
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This is not defined by default.
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DESCRIPTION:
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In case this configuration option is defined, then the support to remove
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nodes is disabled in the root IMFS.
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.. index:: CONFIGURE_IMFS_DISABLE_SYMLINK
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.. _CONFIGURE_IMFS_DISABLE_SYMLINK:
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CONFIGURE_IMFS_DISABLE_SYMLINK
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------------------------------
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CONSTANT:
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``CONFIGURE_IMFS_DISABLE_SYMLINK``
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DATA TYPE:
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Boolean feature macro.
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|
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RANGE:
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Defined or undefined.
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DEFAULT VALUE:
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|
This is not defined by default.
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|
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DESCRIPTION:
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In case this configuration option is defined, then the support to create
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symbolic links is disabled in the root IMFS.
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|
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.. index:: CONFIGURE_IMFS_DISABLE_UNMOUNT
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|
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.. _CONFIGURE_IMFS_DISABLE_UNMOUNT:
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|
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CONFIGURE_IMFS_DISABLE_UNMOUNT
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------------------------------
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|
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CONSTANT:
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|
``CONFIGURE_IMFS_DISABLE_UNMOUNT``
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|
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|
DATA TYPE:
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|
Boolean feature macro.
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|
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|
RANGE:
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|
Defined or undefined.
|
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|
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DEFAULT VALUE:
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|
This is not defined by default.
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|
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DESCRIPTION:
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|
In case this configuration option is defined, then the support to unmount
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|
file systems is disabled in the root IMFS.
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|
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.. index:: CONFIGURE_IMFS_DISABLE_UTIME
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|
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|
.. _CONFIGURE_IMFS_DISABLE_UTIME:
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|
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CONFIGURE_IMFS_DISABLE_UTIME
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|
----------------------------
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|
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|
CONSTANT:
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|
``CONFIGURE_IMFS_DISABLE_UTIME``
|
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|
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||||||
|
DATA TYPE:
|
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|
Boolean feature macro.
|
||||||
|
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||||||
|
RANGE:
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|
Defined or undefined.
|
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|
|
||||||
|
DEFAULT VALUE:
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|
This is not defined by default.
|
||||||
|
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||||||
|
DESCRIPTION:
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||||||
|
In case this configuration option is defined, then the support to change
|
||||||
|
times is disabled in the root IMFS.
|
||||||
|
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||||||
|
.. index:: CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK
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|
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.. _CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK:
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|
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CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK
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--------------------------------------
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|
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CONSTANT:
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|
``CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK``
|
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|
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|
DATA TYPE:
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|
Boolean feature macro.
|
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|
|
||||||
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RANGE:
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|
Valid values for this configuration parameter are a power of two (2)
|
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between 16 and 512 inclusive. In other words, valid values are 16, 32, 64,
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128, 256,and 512.
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|
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DEFAULT VALUE:
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|
The default IMFS block size is 128 bytes.
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|
|
||||||
|
DESCRIPTION:
|
||||||
|
This configuration parameter specifies the block size for in-memory files
|
||||||
|
managed by the IMFS. The configured block size has two impacts. The first
|
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|
is the average amount of unused memory in the last block of each file. For
|
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|
example, when the block size is 512, on average one-half of the last block
|
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|
of each file will remain unused and the memory is wasted. In contrast, when
|
||||||
|
the block size is 16, the average unused memory per file is only 8
|
||||||
|
bytes. However, it requires more allocations for the same size file and
|
||||||
|
thus more overhead per block for the dynamic memory management.
|
||||||
|
|
||||||
|
Second, the block size has an impact on the maximum size file that can be
|
||||||
|
stored in the IMFS. With smaller block size, the maximum file size is
|
||||||
|
correspondingly smaller. The following shows the maximum file size possible
|
||||||
|
based on the configured block size:
|
||||||
|
|
||||||
|
- when the block size is 16 bytes, the maximum file size is 1,328 bytes.
|
||||||
|
|
||||||
|
- when the block size is 32 bytes, the maximum file size is 18,656 bytes.
|
||||||
|
|
||||||
|
- when the block size is 64 bytes, the maximum file size is 279,488 bytes.
|
||||||
|
|
||||||
|
- when the block size is 128 bytes, the maximum file size is 4,329,344 bytes.
|
||||||
|
|
||||||
|
- when the block size is 256 bytes, the maximum file size is 68,173,568 bytes.
|
||||||
|
|
||||||
|
- when the block size is 512 bytes, the maximum file size is 1,082,195,456
|
||||||
|
bytes.
|
||||||
|
|
||||||
|
.. index:: CONFIGURE_MAXIMUM_DEVICES
|
||||||
|
|
||||||
|
.. _CONFIGURE_MAXIMUM_DEVICES:
|
||||||
|
|
||||||
|
CONFIGURE_MAXIMUM_DEVICES
|
||||||
|
-------------------------
|
||||||
|
|
||||||
|
CONSTANT:
|
||||||
|
``CONFIGURE_MAXIMUM_DEVICES``
|
||||||
|
|
||||||
|
DATA TYPE:
|
||||||
|
Unsigned integer (``uint32_t``).
|
||||||
|
|
||||||
|
RANGE:
|
||||||
|
Positive.
|
||||||
|
|
||||||
|
DEFAULT VALUE:
|
||||||
|
If ``BSP_MAXIMUM_DEVICES`` is defined, then the default value is
|
||||||
|
``BSP_MAXIMUM_DEVICES``, otherwise the default value is 4.
|
||||||
|
|
||||||
|
DESCRIPTION:
|
||||||
|
``CONFIGURE_MAXIMUM_DEVICES`` is defined to the number of individual
|
||||||
|
devices that may be registered in the device file system (devFS).
|
||||||
|
|
||||||
|
NOTES:
|
||||||
|
This option is specific to the device file system (devFS) and should not be
|
||||||
|
confused with the ``CONFIGURE_MAXIMUM_DRIVERS`` option. This parameter
|
||||||
|
only impacts the devFS and thus is only used by ``<rtems/confdefs.h>`` when
|
||||||
|
``CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM`` is specified.
|
||||||
|
|
||||||
|
.. index:: CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM
|
||||||
|
|
||||||
|
.. _CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM:
|
||||||
|
|
||||||
|
CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM
|
||||||
|
--------------------------------------
|
||||||
|
|
||||||
|
CONSTANT:
|
||||||
|
``CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM``
|
||||||
|
|
||||||
|
DATA TYPE:
|
||||||
|
Boolean feature macro.
|
||||||
|
|
||||||
|
RANGE:
|
||||||
|
Defined or undefined.
|
||||||
|
|
||||||
|
DEFAULT VALUE:
|
||||||
|
This is not defined by default. If no other root file system configuration
|
||||||
|
parameters are specified, the IMFS will be used as the root file system.
|
||||||
|
|
||||||
|
DESCRIPTION:
|
||||||
|
This configuration parameter is defined if the application wishes to use
|
||||||
|
the device-only filesytem as the root file system.
|
||||||
|
|
||||||
|
NOTES:
|
||||||
|
The device-only filesystem supports only device nodes and is smaller in
|
||||||
|
executable code size than the full IMFS and miniIMFS.
|
||||||
|
|
||||||
|
The devFS is comparable in functionality to the pseudo-filesystem name
|
||||||
|
space provided before RTEMS release 4.5.0.
|
||||||
|
|
||||||
|
.. index:: CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM
|
||||||
|
|
||||||
|
.. _CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM:
|
||||||
|
|
||||||
|
CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM
|
||||||
|
-----------------------------------------
|
||||||
|
|
||||||
|
CONSTANT:
|
||||||
|
``CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM``
|
||||||
|
|
||||||
|
DATA TYPE:
|
||||||
|
Boolean feature macro.
|
||||||
|
|
||||||
|
RANGE:
|
||||||
|
Defined or undefined.
|
||||||
|
|
||||||
|
DEFAULT VALUE:
|
||||||
|
This is not defined by default.
|
||||||
|
|
||||||
|
DESCRIPTION:
|
||||||
|
In case this configuration option is defined, then the following
|
||||||
|
configuration options will be defined as well
|
||||||
|
|
||||||
|
- ``CONFIGURE_IMFS_DISABLE_CHMOD``,
|
||||||
|
|
||||||
|
- ``CONFIGURE_IMFS_DISABLE_CHOWN``,
|
||||||
|
|
||||||
|
- ``CONFIGURE_IMFS_DISABLE_UTIME``,
|
||||||
|
|
||||||
|
- ``CONFIGURE_IMFS_DISABLE_LINK``,
|
||||||
|
|
||||||
|
- ``CONFIGURE_IMFS_DISABLE_SYMLINK``,
|
||||||
|
|
||||||
|
- ``CONFIGURE_IMFS_DISABLE_READLINK``,
|
||||||
|
|
||||||
|
- ``CONFIGURE_IMFS_DISABLE_RENAME``, and
|
||||||
|
|
||||||
|
- ``CONFIGURE_IMFS_DISABLE_UNMOUNT``.
|
||||||
@ -19,550 +19,7 @@ Configuring a System
|
|||||||
posix-init-thread
|
posix-init-thread
|
||||||
task-stack-alloc
|
task-stack-alloc
|
||||||
msg-queue-buffer
|
msg-queue-buffer
|
||||||
|
filesystem
|
||||||
Filesystem Configuration
|
|
||||||
========================
|
|
||||||
|
|
||||||
By default, the In-Memory Filesystem (IMFS) is used as the base filesystem (also
|
|
||||||
known as root filesystem). In order to save some memory for your application,
|
|
||||||
you can disable the filesystem support with the
|
|
||||||
:ref:`CONFIGURE_APPLICATION_DISABLE_FILESYSTEM` configuration option.
|
|
||||||
Alternatively, you can strip down the features of the base filesystem with the
|
|
||||||
:ref:`CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM` and
|
|
||||||
:ref:`CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM` configuration options. These
|
|
||||||
three configuration options are mutually exclusive. They are intended for an
|
|
||||||
advanced application configuration.
|
|
||||||
|
|
||||||
Features of the IMFS can be disabled and enabled with the following
|
|
||||||
configuration options:
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_CHMOD`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_CHOWN`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_LINK`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_MKNOD`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_MKNOD_FILE`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_MOUNT`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_READDIR`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_READLINK`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_RENAME`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_RMNOD`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_SYMLINK`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_UNMOUNT`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_DISABLE_UTIME`
|
|
||||||
|
|
||||||
* :ref:`CONFIGURE_IMFS_ENABLE_MKFIFO`
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_APPLICATION_DISABLE_FILESYSTEM
|
|
||||||
|
|
||||||
.. _CONFIGURE_APPLICATION_DISABLE_FILESYSTEM:
|
|
||||||
|
|
||||||
CONFIGURE_APPLICATION_DISABLE_FILESYSTEM
|
|
||||||
----------------------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_APPLICATION_DISABLE_FILESYSTEM``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default. If no other root file system configuration
|
|
||||||
parameters are specified, the IMFS will be used as the root file system.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
This configuration parameter is defined if the application dose not intend
|
|
||||||
to use any kind of filesystem support. This include the device
|
|
||||||
infrastructure necessary to support ``printf()``.
|
|
||||||
|
|
||||||
NOTES:
|
|
||||||
None.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_ENABLE_MKFIFO
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_ENABLE_MKFIFO:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_ENABLE_MKFIFO
|
|
||||||
----------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_ENABLE_MKFIFO``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to make FIFOs
|
|
||||||
is enabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_CHMOD
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_CHMOD:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_CHMOD
|
|
||||||
----------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_CHMOD``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to change
|
|
||||||
the mode is disabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_CHOWN
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_CHOWN:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_CHOWN
|
|
||||||
----------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_CHOWN``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to change
|
|
||||||
the owner is disabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_LINK
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_LINK:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_LINK
|
|
||||||
---------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_LINK``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to create
|
|
||||||
hard links is disabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_MKNOD
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_MKNOD:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_MKNOD
|
|
||||||
----------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_MKNOD``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to make
|
|
||||||
directories, devices, regular files and FIFOs is disabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_MKNOD_FILE
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_MKNOD_FILE:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_MKNOD_FILE
|
|
||||||
---------------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_MKNOD_FILE``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to make
|
|
||||||
regular files is disabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_MOUNT
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_MOUNT:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_MOUNT
|
|
||||||
----------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_MOUNT``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to mount
|
|
||||||
other file systems is disabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_READDIR
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_READDIR:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_READDIR
|
|
||||||
------------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_READDIR``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to read a
|
|
||||||
directory is disabled in the root IMFS. It is still possible to open nodes
|
|
||||||
in a directory.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_READLINK
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_READLINK:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_READLINK
|
|
||||||
-------------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_READLINK``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to read
|
|
||||||
symbolic links is disabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_RENAME
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_RENAME:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_RENAME
|
|
||||||
-----------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_RENAME``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to rename
|
|
||||||
nodes is disabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_RMNOD
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_RMNOD:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_RMNOD
|
|
||||||
----------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_RMNOD``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to remove
|
|
||||||
nodes is disabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_SYMLINK
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_SYMLINK:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_SYMLINK
|
|
||||||
------------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_SYMLINK``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to create
|
|
||||||
symbolic links is disabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_UNMOUNT
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_UNMOUNT:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_UNMOUNT
|
|
||||||
------------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_UNMOUNT``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to unmount
|
|
||||||
file systems is disabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_DISABLE_UTIME
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_DISABLE_UTIME:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_DISABLE_UTIME
|
|
||||||
----------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_DISABLE_UTIME``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the support to change
|
|
||||||
times is disabled in the root IMFS.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK
|
|
||||||
|
|
||||||
.. _CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK:
|
|
||||||
|
|
||||||
CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK
|
|
||||||
--------------------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Valid values for this configuration parameter are a power of two (2)
|
|
||||||
between 16 and 512 inclusive. In other words, valid values are 16, 32, 64,
|
|
||||||
128, 256,and 512.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
The default IMFS block size is 128 bytes.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
This configuration parameter specifies the block size for in-memory files
|
|
||||||
managed by the IMFS. The configured block size has two impacts. The first
|
|
||||||
is the average amount of unused memory in the last block of each file. For
|
|
||||||
example, when the block size is 512, on average one-half of the last block
|
|
||||||
of each file will remain unused and the memory is wasted. In contrast, when
|
|
||||||
the block size is 16, the average unused memory per file is only 8
|
|
||||||
bytes. However, it requires more allocations for the same size file and
|
|
||||||
thus more overhead per block for the dynamic memory management.
|
|
||||||
|
|
||||||
Second, the block size has an impact on the maximum size file that can be
|
|
||||||
stored in the IMFS. With smaller block size, the maximum file size is
|
|
||||||
correspondingly smaller. The following shows the maximum file size possible
|
|
||||||
based on the configured block size:
|
|
||||||
|
|
||||||
- when the block size is 16 bytes, the maximum file size is 1,328 bytes.
|
|
||||||
|
|
||||||
- when the block size is 32 bytes, the maximum file size is 18,656 bytes.
|
|
||||||
|
|
||||||
- when the block size is 64 bytes, the maximum file size is 279,488 bytes.
|
|
||||||
|
|
||||||
- when the block size is 128 bytes, the maximum file size is 4,329,344 bytes.
|
|
||||||
|
|
||||||
- when the block size is 256 bytes, the maximum file size is 68,173,568 bytes.
|
|
||||||
|
|
||||||
- when the block size is 512 bytes, the maximum file size is 1,082,195,456
|
|
||||||
bytes.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_MAXIMUM_DEVICES
|
|
||||||
|
|
||||||
.. _CONFIGURE_MAXIMUM_DEVICES:
|
|
||||||
|
|
||||||
CONFIGURE_MAXIMUM_DEVICES
|
|
||||||
-------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_MAXIMUM_DEVICES``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Unsigned integer (``uint32_t``).
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Positive.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
If ``BSP_MAXIMUM_DEVICES`` is defined, then the default value is
|
|
||||||
``BSP_MAXIMUM_DEVICES``, otherwise the default value is 4.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
``CONFIGURE_MAXIMUM_DEVICES`` is defined to the number of individual
|
|
||||||
devices that may be registered in the device file system (devFS).
|
|
||||||
|
|
||||||
NOTES:
|
|
||||||
This option is specific to the device file system (devFS) and should not be
|
|
||||||
confused with the ``CONFIGURE_MAXIMUM_DRIVERS`` option. This parameter
|
|
||||||
only impacts the devFS and thus is only used by ``<rtems/confdefs.h>`` when
|
|
||||||
``CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM`` is specified.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM
|
|
||||||
|
|
||||||
.. _CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM:
|
|
||||||
|
|
||||||
CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM
|
|
||||||
--------------------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default. If no other root file system configuration
|
|
||||||
parameters are specified, the IMFS will be used as the root file system.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
This configuration parameter is defined if the application wishes to use
|
|
||||||
the device-only filesytem as the root file system.
|
|
||||||
|
|
||||||
NOTES:
|
|
||||||
The device-only filesystem supports only device nodes and is smaller in
|
|
||||||
executable code size than the full IMFS and miniIMFS.
|
|
||||||
|
|
||||||
The devFS is comparable in functionality to the pseudo-filesystem name
|
|
||||||
space provided before RTEMS release 4.5.0.
|
|
||||||
|
|
||||||
.. index:: CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM
|
|
||||||
|
|
||||||
.. _CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM:
|
|
||||||
|
|
||||||
CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM
|
|
||||||
-----------------------------------------
|
|
||||||
|
|
||||||
CONSTANT:
|
|
||||||
``CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM``
|
|
||||||
|
|
||||||
DATA TYPE:
|
|
||||||
Boolean feature macro.
|
|
||||||
|
|
||||||
RANGE:
|
|
||||||
Defined or undefined.
|
|
||||||
|
|
||||||
DEFAULT VALUE:
|
|
||||||
This is not defined by default.
|
|
||||||
|
|
||||||
DESCRIPTION:
|
|
||||||
In case this configuration option is defined, then the following
|
|
||||||
configuration options will be defined as well
|
|
||||||
|
|
||||||
- ``CONFIGURE_IMFS_DISABLE_CHMOD``,
|
|
||||||
|
|
||||||
- ``CONFIGURE_IMFS_DISABLE_CHOWN``,
|
|
||||||
|
|
||||||
- ``CONFIGURE_IMFS_DISABLE_UTIME``,
|
|
||||||
|
|
||||||
- ``CONFIGURE_IMFS_DISABLE_LINK``,
|
|
||||||
|
|
||||||
- ``CONFIGURE_IMFS_DISABLE_SYMLINK``,
|
|
||||||
|
|
||||||
- ``CONFIGURE_IMFS_DISABLE_READLINK``,
|
|
||||||
|
|
||||||
- ``CONFIGURE_IMFS_DISABLE_RENAME``, and
|
|
||||||
|
|
||||||
- ``CONFIGURE_IMFS_DISABLE_UNMOUNT``.
|
|
||||||
|
|
||||||
Block Device Cache Configuration
|
Block Device Cache Configuration
|
||||||
================================
|
================================
|
||||||
|
|||||||
Loading…
x
Reference in New Issue
Block a user