linux/fs/ufs/Kconfig
Christoph Hellwig 925c86a19b fs: add CONFIG_BUFFER_HEAD
Add a new config option that controls building the buffer_head code, and
select it from all file systems and stacking drivers that need it.

For the block device nodes and alternative iomap based buffered I/O path
is provided when buffer_head support is not enabled, and iomap needs a
a small tweak to define the IOMAP_F_BUFFER_HEAD flag to 0 to not call
into the buffer_head code when it doesn't exist.

Otherwise this is just Kconfig and ifdef changes.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20230801172201.1923299-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-08-02 09:13:09 -06:00

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# SPDX-License-Identifier: GPL-2.0-only
config UFS_FS
tristate "UFS file system support (read only)"
depends on BLOCK
select BUFFER_HEAD
help
BSD and derivate versions of Unix (such as SunOS, FreeBSD, NetBSD,
OpenBSD and NeXTstep) use a file system called UFS. Some System V
Unixes can create and mount hard disk partitions and diskettes using
this file system as well. Saying Y here will allow you to read from
these partitions; if you also want to write to them, say Y to the
experimental "UFS file system write support", below. Please read the
file <file:Documentation/admin-guide/ufs.rst> for more information.
The recently released UFS2 variant (used in FreeBSD 5.x) is
READ-ONLY supported.
Note that this option is generally not needed for floppies, since a
good portable way to transport files and directories between unixes
(and even other operating systems) is given by the tar program ("man
tar" or preferably "info tar").
When accessing NeXTstep files, you may need to convert them from the
NeXT character set to the Latin1 character set; use the program
recode ("info recode") for this purpose.
To compile the UFS file system support as a module, choose M here: the
module will be called ufs.
If you haven't heard about all of this before, it's safe to say N.
config UFS_FS_WRITE
bool "UFS file system write support (DANGEROUS)"
depends on UFS_FS
help
Say Y here if you want to try writing to UFS partitions. This is
experimental, so you should back up your UFS partitions beforehand.
config UFS_DEBUG
bool "UFS debugging"
depends on UFS_FS
help
If you are experiencing any problems with the UFS filesystem, say
Y here. This will result in _many_ additional debugging messages to be
written to the system log.