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restic/vendor/bazil.org/fuse/doc/mount-linux-error-init.seq
2017-07-23 14:25:38 +02:00

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seqdiag {
app;
fuse [label="bazil.org/fuse"];
fusermount;
kernel;
mounts;
app;
fuse [label="bazil.org/fuse"];
fusermount;
kernel;
mounts;
app -> fuse [label="Mount"];
fuse -> fusermount [label="spawn, pass socketpair fd"];
fusermount -> kernel [label="open /dev/fuse"];
fusermount -> kernel [label="mount(2)"];
kernel ->> mounts [label="mount is visible"];
fusermount <-- kernel [label="mount(2) returns"];
fuse <<-- fusermount [diagonal, label="exit, receive /dev/fuse fd", leftnote="on Linux, successful exit here\nmeans the mount has happened,\nthough InitRequest might not have yet"];
app <-- fuse [label="Mount returns\nConn.Ready is already closed"];
app -> fuse [label="fs.Serve"];
fuse => kernel [label="read /dev/fuse fd", note="starts with InitRequest"];
fuse -> app [label="Init"];
fuse <-- app [color=red];
fuse -> kernel [label="write /dev/fuse fd", color=red];
kernel -> kernel [label="set connection\nstate to error", color=red];
fuse <-- kernel;
... conn.MountError == nil, so it is still mounted ...
... call conn.Close to clean up ...
}