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fs: build the legacy direct I/O code conditionally

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Add a new LEGACY_DIRECT_IO config symbol that is only selected by the
file systems that still use the legacy blockdev_direct_IO code, so that
kernels without support for those file systems don't need to build the
code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20230125065839.191256-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2023-01-25 07:58:39 +01:00 • committed by Jens Axboe
parent 439bc39b3c
commit 9636e650e1
14 changed files with 18 additions and 1 deletions
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1
fs/fat/Kconfig
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@ -2,6 +2,7 @@
config FAT_FS
tristate
select NLS
select LEGACY_DIRECT_IO
help
If you want to use one of the FAT-based file systems (the MS-DOS and
VFAT (Windows 95) file systems), then you must say Y or M here