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FROMLIST: fuse: Definitions and ioctl for passthrough

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Expose the FUSE_PASSTHROUGH interface to user space and declare all the
basic data structures and functions as the skeleton on top of which the
FUSE passthrough functionality will be built.

As part of this, introduce the new FUSE passthrough ioctl, which allows
the FUSE daemon to specify a direct connection between a FUSE file and a
lower file system file. Such ioctl requires user space to pass the file
descriptor of one of its opened files through the fuse_passthrough_out
data structure introduced in this patch. This structure includes extra
fields for possible future extensions.
Also, add the passthrough functions for the set-up and tear-down of the
data structures and locks that will be used both when fuse_conns and
fuse_files are created/deleted.

Bug: 168023149
Link: https://lore.kernel.org/lkml/20210125153057.3623715-4-balsini@android.com/
Signed-off-by: Alessio Balsini <balsini@android.com>
Change-Id: I732532581348adadda5b5048a9346c2b0868d539
Signed-off-by: Alessio Balsini <balsini@google.com>
This commit is contained in:
Alessio Balsini
2021-01-25 17:02:28 +00:00
parent 7fe32351b6
commit 9634f0e4e2
8 changed files with 93 additions and 3 deletions
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4
fs/fuse/file.c
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@@ -152,7 +152,7 @@ int fuse_do_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
if (!err) {
ff->fh = outarg.fh;
ff->open_flags = outarg.open_flags;
fuse_passthrough_setup(fc, ff, &outarg);
} else if (err != -ENOSYS) {
fuse_file_free(ff);
return err;
@@ -298,6 +298,8 @@ void fuse_release_common(struct file *file, bool isdir)
struct fuse_release_args *ra = ff->release_args;
int opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE;
fuse_passthrough_release(&ff->passthrough);
fuse_prepare_release(fi, ff, file->f_flags, opcode);
if (ff->flock) {