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925c86a19b
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>
46 lines
1.8 KiB
Plaintext
46 lines
1.8 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config UFS_FS
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tristate "UFS file system support (read only)"
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depends on BLOCK
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select BUFFER_HEAD
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help
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BSD and derivate versions of Unix (such as SunOS, FreeBSD, NetBSD,
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OpenBSD and NeXTstep) use a file system called UFS. Some System V
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Unixes can create and mount hard disk partitions and diskettes using
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this file system as well. Saying Y here will allow you to read from
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these partitions; if you also want to write to them, say Y to the
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experimental "UFS file system write support", below. Please read the
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file <file:Documentation/admin-guide/ufs.rst> for more information.
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The recently released UFS2 variant (used in FreeBSD 5.x) is
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READ-ONLY supported.
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Note that this option is generally not needed for floppies, since a
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good portable way to transport files and directories between unixes
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(and even other operating systems) is given by the tar program ("man
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tar" or preferably "info tar").
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When accessing NeXTstep files, you may need to convert them from the
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NeXT character set to the Latin1 character set; use the program
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recode ("info recode") for this purpose.
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To compile the UFS file system support as a module, choose M here: the
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module will be called ufs.
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If you haven't heard about all of this before, it's safe to say N.
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config UFS_FS_WRITE
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bool "UFS file system write support (DANGEROUS)"
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depends on UFS_FS
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help
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Say Y here if you want to try writing to UFS partitions. This is
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experimental, so you should back up your UFS partitions beforehand.
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config UFS_DEBUG
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bool "UFS debugging"
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depends on UFS_FS
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help
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If you are experiencing any problems with the UFS filesystem, say
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Y here. This will result in _many_ additional debugging messages to be
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written to the system log.
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