fuse: prepare for opening file in passthrough mode

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In preparation for opening file in passthrough mode, store the
fuse_open_out argument in ff->args to be passed into fuse_file_io_open()
with the optional backing_id member.

This will be used for setting up passthrough to backing file on open
reply with FOPEN_PASSTHROUGH flag and a valid backing_id.

Opening a file in passthrough mode may fail for several reasons, such as
missing capability, conflicting open flags or inode in caching mode.
Return EIO from fuse_file_io_open() in those cases.

The combination of FOPEN_PASSTHROUGH and FOPEN_DIRECT_IO is allowed -
it mean that read/write operations will go directly to the server,
but mmap will be done to the backing file.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

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This commit is contained in:

Amir Goldstein 2024-02-09 17:03:55 +02:00 • committed by Miklos Szeredi

parent 44350256ab

commit fc8ff397b2

4 changed files with 78 additions and 31 deletions

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12

fs/fuse/dir.c

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34

fs/fuse/file.c

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19

fs/fuse/fuse_i.h

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44

fs/fuse/iomode.c

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