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FUSE_PASSTHROUGH capability to passthrough FUSE operations to backing files will be made available with kernel config CONFIG_FUSE_PASSTHROUGH. When requesting FUSE_PASSTHROUGH, userspace needs to specify the max_stack_depth that is allowed for FUSE on top of backing files. Introduce the flag FOPEN_PASSTHROUGH and backing_id to fuse_open_out argument that can be used when replying to OPEN request, to setup passthrough of io operations on the fuse inode to a backing file. Introduce a refcounted fuse_backing object that will be used to associate an open backing file with a fuse inode. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
66 lines
1.9 KiB
Plaintext
66 lines
1.9 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config FUSE_FS
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tristate "FUSE (Filesystem in Userspace) support"
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select FS_POSIX_ACL
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help
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With FUSE it is possible to implement a fully functional filesystem
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in a userspace program.
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There's also a companion library: libfuse2. This library is available
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from the FUSE homepage:
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<https://github.com/libfuse/>
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although chances are your distribution already has that library
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installed if you've installed the "fuse" package itself.
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See <file:Documentation/filesystems/fuse.rst> for more information.
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See <file:Documentation/Changes> for needed library/utility version.
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If you want to develop a userspace FS, or if you want to use
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a filesystem based on FUSE, answer Y or M.
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config CUSE
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tristate "Character device in Userspace support"
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depends on FUSE_FS
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help
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This FUSE extension allows character devices to be
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implemented in userspace.
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If you want to develop or use a userspace character device
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based on CUSE, answer Y or M.
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config VIRTIO_FS
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tristate "Virtio Filesystem"
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depends on FUSE_FS
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select VIRTIO
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help
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The Virtio Filesystem allows guests to mount file systems from the
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host.
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If you want to share files between guests or with the host, answer Y
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or M.
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config FUSE_DAX
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bool "Virtio Filesystem Direct Host Memory Access support"
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default y
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select INTERVAL_TREE
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depends on VIRTIO_FS
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depends on FS_DAX
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depends on DAX
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help
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This allows bypassing guest page cache and allows mapping host page
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cache directly in guest address space.
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If you want to allow mounting a Virtio Filesystem with the "dax"
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option, answer Y.
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config FUSE_PASSTHROUGH
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bool "FUSE passthrough operations support"
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default y
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depends on FUSE_FS
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select FS_STACK
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help
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This allows bypassing FUSE server by mapping specific FUSE operations
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to be performed directly on a backing file.
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If you want to allow passthrough operations, answer Y.
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