Commit a2225d93 authored by Linus Torvalds's avatar Linus Torvalds

autofs: remove left-over autofs4 stubs

There's no need to retain the fs/autofs4 directory for backward
compatibility.

Adding an AUTOFS4_FS fragment to the autofs Kconfig and a module alias
for autofs4 is sufficient for almost all cases. Not keeping fs/autofs4
remnants will prevent "insmod <path>/autofs4/autofs4.ko" from working
but this shouldn't be used in automation scripts rather than
modprobe(8).

There were some comments about things to look out for with the module
rename in the fs/autofs4/Kconfig that is removed by this patch, see the
commit patch if you are interested.

One potential problem with this change is that when the
fs/autofs/Kconfig fragment for AUTOFS4_FS is removed any AUTOFS4_FS
entries will be removed from the kernel config, resulting in no autofs
file system being built if there is no AUTOFS_FS entry also.

This would have also happened if the fs/autofs4 remnants had remained
and is most likely to be a problem with automated builds.

Please check your build configurations before the removal which will
occur after the next couple of kernel releases.
Acked-by: default avatarIan Kent <raven@themaw.net>
[ With edits and commit message from Ian Kent ]
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 0f105cf4
......@@ -110,7 +110,6 @@ source "fs/notify/Kconfig"
source "fs/quota/Kconfig"
source "fs/autofs/Kconfig"
source "fs/autofs4/Kconfig"
source "fs/fuse/Kconfig"
source "fs/overlayfs/Kconfig"
......
......@@ -103,7 +103,6 @@ obj-$(CONFIG_ROMFS_FS) += romfs/
obj-$(CONFIG_QNX4FS_FS) += qnx4/
obj-$(CONFIG_QNX6FS_FS) += qnx6/
obj-$(CONFIG_AUTOFS_FS) += autofs/
obj-$(CONFIG_AUTOFS4_FS) += autofs4/
obj-$(CONFIG_ADFS_FS) += adfs/
obj-$(CONFIG_FUSE_FS) += fuse/
obj-$(CONFIG_OVERLAY_FS) += overlayfs/
......
config AUTOFS4_FS
tristate "Old Kconfig name for Kernel automounter support"
select AUTOFS_FS
help
This name exists for people to just automatically pick up the
new name of the autofs Kconfig option. All it does is select
thenew new option name.
It will go away in a release or two as people have
transitioned to just plain AUTOFS_FS.
config AUTOFS_FS
tristate "Kernel automounter support (supports v3, v4 and v5)"
default n
......
......@@ -23,6 +23,7 @@ static struct file_system_type autofs_fs_type = {
.kill_sb = autofs_kill_sb,
};
MODULE_ALIAS_FS("autofs");
MODULE_ALIAS("autofs4");
static int __init init_autofs_fs(void)
{
......
config AUTOFS4_FS
tristate "Kernel automounter version 4 support (also supports v3 and v5)"
default n
depends on AUTOFS_FS = n
help
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.
#
# Makefile for the linux autofs-filesystem routines.
#
obj-$(CONFIG_AUTOFS4_FS) += autofs4.o
autofs4-objs := ../autofs/init.o ../autofs/inode.o ../autofs/root.o \
../autofs/symlink.o ../autofs/waitq.o ../autofs/expire.o \
../autofs/dev-ioctl.o
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