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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>
39 lines
1.7 KiB
Plaintext
39 lines
1.7 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config SYSV_FS
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tristate "System V/Xenix/V7/Coherent file system support"
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depends on BLOCK
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select BUFFER_HEAD
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help
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SCO, Xenix and Coherent are commercial Unix systems for Intel
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machines, and Version 7 was used on the DEC PDP-11. Saying Y
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here would allow you to read from their floppies and hard disk
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partitions.
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If you have floppies or hard disk partitions like that, it is likely
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that they contain binaries from those other Unix systems; in order
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to run these binaries, you will want to install linux-abi which is
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a set of kernel modules that lets you run SCO, Xenix, Wyse,
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UnixWare, Dell Unix and System V programs under Linux. It is
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available via FTP (user: ftp) from
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<ftp://ftp.openlinux.org/pub/people/hch/linux-abi/>).
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NOTE: that will work only for binaries from Intel-based systems;
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PDP ones will have to wait until somebody ports Linux to -11 ;-)
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If you only intend to mount files from some other Unix over the
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network using NFS, you don't need the System V file system support
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(but you need NFS file system support obviously).
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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"). Note also that this option has
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nothing whatsoever to do with the option "System V IPC". Read about
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the System V file system in
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<file:Documentation/filesystems/sysv-fs.rst>.
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Saying Y here will enlarge your kernel by about 27 KB.
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To compile this as a module, choose M here: the module will be called
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sysv.
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If you haven't heard about all of this before, it's safe to say N.
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