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CONFIG_AUTOFS4_FS: Kernel automounter version 4 support (also supports v3 and v5)

General informations

The Linux kernel configuration item CONFIG_AUTOFS4_FS has multiple definitions:

Kernel automounter version 4 support (also supports v3 and v5) found in fs/autofs4/Kconfig

The configuration item CONFIG_AUTOFS4_FS:

Help text

The automounter is a tool to automatically mount remote file systems on demand. This implementation is partially kernel-based to reduce overhead in the already-mounted case; this is unlike the BSD automounter (amd), which is a pure user space daemon.

To use the automounter you need the user-space tools from https://www.kernel.org/pub/linux/daemons/autofs/; you also want to answer Y to "NFS file system support", below.

This module is in the process of being renamed from autofs4 to autofs. Since autofs is now the only module that provides the autofs file system the module is not version 4 specific.

The autofs4 module is now built from the source located in fs/autofs. The autofs4 directory and its configuration entry will be removed two kernel versions from the inclusion of this change.

Changes that will need to be made should be limited to: - source include statments should be changed from autofs_fs4.h to autofs_fs.h since these two header files have been merged. - user space scripts that manually load autofs4.ko should be changed to load autofs.ko. But since the module directory name and the module name are the same as the file system name there is no need to manually load module. - any "alias autofs autofs4" will need to be removed. - due to the autofs4 module directory name not being the same as its file system name autoloading didn't work properly. Because of this kernel configurations would often build the module into the kernel. This may have resulted in selinux policies that will prevent the autofs module from autoloading and will need to be updated.

Please configure AUTOFS_FS instead of AUTOFS4_FS from now on.

NOTE: Since the modules autofs and autofs4 use the same file system type name of "autofs" only one can be built. The "depends" above will result in AUTOFS4_FS not appearing in .config for any setting of AUTOFS_FS other than n and AUTOFS4_FS will appear under the AUTOFS_FS entry otherwise which is intended to draw attention to the module rename change.

Kernel automounter version 4 support (also supports v3) found in fs/Kconfig

The configuration item CONFIG_AUTOFS4_FS:

Help text

The automounter is a tool to automatically mount remote file systems on demand. This implementation is partially kernel-based to reduce overhead in the already-mounted case; this is unlike the BSD automounter (amd), which is a pure user space daemon.

To use the automounter you need the user-space tools from <ftp://ftp.kernel.org/pub/linux/daemons/autofs/v4/>; you also want to answer Y to "NFS file system support", below.

To compile this support as a module, choose M here: the module will be called autofs4. You will need to add "alias autofs autofs4" to your modules configuration file.

If you are not a part of a fairly large, distributed network or don't have a laptop which needs to dynamically reconfigure to the local network, you probably do not need an automounter, and can say N here.

Kernel automounter version 4 support (also supports v3) found in fs/autofs4/Kconfig

The configuration item CONFIG_AUTOFS4_FS:

Help text

The automounter is a tool to automatically mount remote file systems on demand. This implementation is partially kernel-based to reduce overhead in the already-mounted case; this is unlike the BSD automounter (amd), which is a pure user space daemon.

To use the automounter you need the user-space tools from https://www.kernel.org/pub/linux/daemons/autofs/v4/; you also want to answer Y to "NFS file system support", below.

To compile this support as a module, choose M here: the module will be called autofs4. You will need to add "alias autofs autofs4" to your modules configuration file.

If you are not a part of a fairly large, distributed network or don't have a laptop which needs to dynamically reconfigure to the local network, you probably do not need an automounter, and can say N here.

Old Kconfig name for Kernel automounter support found in fs/autofs/Kconfig

The configuration item CONFIG_AUTOFS4_FS:

Help text

This name exists for people to just automatically pick up the new name of the autofs Kconfig option. All it does is select the new option name.

It will go away in a release or two as people have transitioned to just plain AUTOFS_FS.

Hardware

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