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8b857eef9c
* Ship Stargz Snapshotter Signed-off-by: ktock <ktokunaga.mail@gmail.com> * Bump github.com/containerd/stargz-snapshotter to v0.8.0 Signed-off-by: Kohei Tokunaga <ktokunaga.mail@gmail.com>
50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
package fuse
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// Go 1.9 introduces polling for file I/O. The implementation causes
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// the runtime's epoll to take up the last GOMAXPROCS slot, and if
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// that happens, we won't have any threads left to service FUSE's
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// _OP_POLL request. Prevent this by forcing _OP_POLL to happen, so we
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// can say ENOSYS and prevent further _OP_POLL requests.
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const pollHackName = ".go-fuse-epoll-hack"
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const pollHackInode = ^uint64(0)
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func doPollHackLookup(ms *Server, req *request) {
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attr := Attr{
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Ino: pollHackInode,
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Mode: S_IFREG | 0644,
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Nlink: 1,
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}
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switch req.inHeader.Opcode {
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case _OP_LOOKUP:
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out := (*EntryOut)(req.outData())
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*out = EntryOut{
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NodeId: pollHackInode,
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Attr: attr,
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}
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req.status = OK
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case _OP_OPEN:
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out := (*OpenOut)(req.outData())
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*out = OpenOut{
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Fh: pollHackInode,
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}
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req.status = OK
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case _OP_GETATTR, _OP_SETATTR:
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out := (*AttrOut)(req.outData())
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out.Attr = attr
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req.status = OK
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case _OP_POLL:
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req.status = ENOSYS
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case _OP_ACCESS, _OP_FLUSH, _OP_RELEASE:
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// Avoid upsetting the OSX mount process.
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req.status = OK
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default:
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// We want to avoid switching off features through our
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// poll hack, so don't use ENOSYS. It would be nice if
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// we could transmit no error code at all, but for
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// some opcodes, we'd have to invent credible data to
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// return as well.
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req.status = ERANGE
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}
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}
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