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FUSE_GETATTR is called when a stat(2), fstat(2), or lstat(2) is issued
from VFS2 layer to a FUSE filesystem.
Fixes #3175
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This change allows the sentry to send FUSE_INIT request and process
the reply. It adds the corresponding structs, employs the fuse
device to send and read the message, and stores the results of negotiation
in corresponding places (inside connection struct).
It adds a CallAsync() function to the FUSE connection interface:
- like Call(), but it's for requests that do not expect immediate response (init, release, interrupt etc.)
- will block if the connection hasn't initialized, which is the same for Call()
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This PR adds the following:
- [x] Marshall-able structs for fuse headers
- [x] Data structures needed in /dev/fuse to communicate with the daemon server
- [x] Implementation of the device interface
- [x] Go unit tests
This change adds the `/dev/fuse` implementation. `Connection` controls the
communication between the server and the sentry. The FUSE server uses
the `FileDescription` interface to interact with the Sentry. The Sentry
implmenetation of fusefs, uses `Connection` and the Connection interface
to interact with the Server. All communication messages are in the form
of `go_marshal` backed structs defined in the ABI package.
This change also adds some go unit tests that test (pretty basically)
the interfaces and should be used as an example of an end to end FUSE
operation.
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/3083 from ridwanmsharif:ridwanmsharif/fuse-device-impl 69aa2ce970004938fe9f918168dfe57636ab856e
PiperOrigin-RevId: 323428180
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