45 lines
1.7 KiB
Text
45 lines
1.7 KiB
Text
seqdiag {
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// seqdiag -T svg -o doc/mount-osx.svg doc/mount-osx.seq
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app;
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fuse [label="bazil.org/fuse"];
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wait [label="callMount\nhelper goroutine"];
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mount_osxfusefs;
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kernel;
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mounts;
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app -> fuse [label="Mount"];
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fuse -> kernel [label="open /dev/osxfuseN"];
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fuse -> mount_osxfusefs [label="spawn, pass fd"];
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fuse -> wait [label="goroutine", note="blocks on cmd.Wait"];
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app <-- fuse [label="Mount returns"];
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mount_osxfusefs -> kernel [label="mount(2)"];
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app -> fuse [label="fs.Serve"];
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fuse => kernel [label="read /dev/osxfuseN fd", note="starts with InitRequest,\nalso seen before mount exits:\ntwo StatfsRequest calls"];
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fuse => app [label="FS/Node/Handle methods"];
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fuse => kernel [label="write /dev/osxfuseN fd"];
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... repeat ...
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kernel ->> mounts [label="mount is visible"];
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mount_osxfusefs <-- kernel [label="mount(2) returns"];
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wait <<-- mount_osxfusefs [diagonal, label="exit", leftnote="on OS X, successful exit\nhere means we finally know\nthe mount has happened\n(can't trust InitRequest,\nkernel might have timed out\nwaiting for InitResponse)"];
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app <<-- wait [diagonal, label="mount is ready,\nclose Conn.Ready", rightnote="InitRequest and StatfsRequest\nmay or may not be seen\nbefore Conn.Ready,\ndepending on platform"];
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... shutting down ...
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app -> fuse [label="Unmount"];
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fuse -> kernel [label="umount(2)"];
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kernel <<-- mounts;
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fuse <-- kernel;
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app <-- fuse [label="Unmount returns"];
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// actually triggers before above
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fuse <<-- kernel [diagonal, label="/dev/osxfuseN EOF"];
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app <-- fuse [label="fs.Serve returns"];
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app -> fuse [label="conn.Close"];
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fuse -> kernel [label="close /dev/osxfuseN"];
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fuse <-- kernel;
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app <-- fuse;
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}
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