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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>
38 lines
1.4 KiB
Plaintext
38 lines
1.4 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config GFS2_FS
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tristate "GFS2 file system support"
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select BUFFER_HEAD
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select FS_POSIX_ACL
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select CRC32
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select LIBCRC32C
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select QUOTACTL
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select FS_IOMAP
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help
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A cluster filesystem.
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Allows a cluster of computers to simultaneously use a block device
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that is shared between them (with FC, iSCSI, NBD, etc...). GFS reads
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and writes to the block device like a local filesystem, but also uses
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a lock module to allow the computers coordinate their I/O so
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filesystem consistency is maintained. One of the nifty features of
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GFS is perfect consistency -- changes made to the filesystem on one
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machine show up immediately on all other machines in the cluster.
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To use the GFS2 filesystem in a cluster, you will need to enable
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the locking module below. Documentation and utilities for GFS2 can
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be found here: http://sources.redhat.com/cluster
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The "nolock" lock module is now built in to GFS2 by default. If
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you want to use the DLM, be sure to enable IPv4/6 networking.
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config GFS2_FS_LOCKING_DLM
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bool "GFS2 DLM locking"
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depends on (GFS2_FS!=n) && NET && INET && (IPV6 || IPV6=n) && \
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CONFIGFS_FS && SYSFS && (DLM=y || DLM=GFS2_FS)
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help
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Multiple node locking module for GFS2
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Most users of GFS2 will require this. It provides the locking
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interface between GFS2 and the DLM, which is required to use GFS2
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in a cluster environment.
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