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Earlier this function was returning (int, error) much like the Copy{In/Out}
methods. The returned error was always nil. The returned int was never used.
Instead make it returned the shifted buffer which is more useful.
Updates #6450
PiperOrigin-RevId: 408268327
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Change marshal.Marshallable method signatures to return the remaining buffer.
This makes it easier to implement these method manually. Without this, we would
have to manually do buffer shifting which is error prone.
tools/go_marshal/test:benchmark test does not show change in performance.
Additionally fixed some marshalling bugs in fsimpl/fuse.
Updated multiple callpoints to get rid of redundant slice indexing work and
simplified code using this new signature.
Updates #6450
PiperOrigin-RevId: 407857019
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The p9 client does the same. This allows applications to read/write >= 2MB of
data. This enables the read write benchmarks to work with lisafs.
Updates #5466
PiperOrigin-RevId: 398659947
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Introduces RPC methods in lisafs. Makes that gofer client use lisafs RPCs
instead of p9 when lisafs is enabled.
Implements the handlers for those methods in fsgofer.
Fixes #5465
PiperOrigin-RevId: 398080310
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This change mainly aims to define the semantics of communication for the LISAFS
(LInux SAndbox Filesystem) protocol. This protocol aims to replace 9P and
intends to bring some performance benefits with it.
Some of the notable differences from the p9 package are:
- Now the server implementations own the handlers.
- As a result, there is no verbose interface like `p9.File` that all servers
need to implement. Different implementations can extend their File
implementations to varying degrees without imposing those extensions to other
server implementations that might not have anything to do with those features.
- If a server implementation adds a new RPC message, other implementations are
not compelled to support it.
I wrote a benchmark `BenchmarkSendRecv` in connection_test.go which competes
with p9's `BenchmarkSendRecvChannel`. Running these on an AMD Milan machine
shows that lisafs is **45%** faster.
**With 9P**
goos: linux
goarch: amd64
pkg: gvisor/pkg/p9/p9
cpu: AMD EPYC 7B13 64-Core Processor
BenchmarkSendRecvLegacy-256 82830 14053 ns/op 633 B/op 23 allocs/op
BenchmarkSendRecvChannel-256 776971 1551 ns/op 184 B/op 6 allocs/op
**With lisafs**
goos: linux
goarch: amd64
pkg: pkg/lisafs/connection_test
cpu: AMD EPYC 7B13 64-Core Processor
BenchmarkSendRecv-256 1399610 853.5 ns/op 48 B/op 2 allocs/op
Fixes #5464
PiperOrigin-RevId: 397803163
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Tentatively `lisafs` (LInux SAndbox FileSystem).
PiperOrigin-RevId: 331839246
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