mirror of https://github.com/k3s-io/k3s
50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
|
package fuse
|
||
|
|
|
||
|
|
// Go 1.9 introduces polling for file I/O. The implementation causes
|
||
|
|
// the runtime's epoll to take up the last GOMAXPROCS slot, and if
|
||
|
|
// that happens, we won't have any threads left to service FUSE's
|
||
|
|
// _OP_POLL request. Prevent this by forcing _OP_POLL to happen, so we
|
||
|
|
// can say ENOSYS and prevent further _OP_POLL requests.
|
||
|
|
const pollHackName = ".go-fuse-epoll-hack"
|
||
|
|
const pollHackInode = ^uint64(0)
|
||
|
|
|
||
|
|
func doPollHackLookup(ms *Server, req *request) {
|
||
|
|
attr := Attr{
|
||
|
|
Ino: pollHackInode,
|
||
|
|
Mode: S_IFREG | 0644,
|
||
|
|
Nlink: 1,
|
||
|
|
}
|
||
|
|
switch req.inHeader.Opcode {
|
||
|
|
case _OP_LOOKUP:
|
||
|
|
out := (*EntryOut)(req.outData())
|
||
|
|
*out = EntryOut{
|
||
|
|
NodeId: pollHackInode,
|
||
|
|
Attr: attr,
|
||
|
|
}
|
||
|
|
req.status = OK
|
||
|
|
case _OP_OPEN:
|
||
|
|
out := (*OpenOut)(req.outData())
|
||
|
|
*out = OpenOut{
|
||
|
|
Fh: pollHackInode,
|
||
|
|
}
|
||
|
|
req.status = OK
|
||
|
|
case _OP_GETATTR, _OP_SETATTR:
|
||
|
|
out := (*AttrOut)(req.outData())
|
||
|
|
out.Attr = attr
|
||
|
|
req.status = OK
|
||
|
|
case _OP_POLL:
|
||
|
|
req.status = ENOSYS
|
||
|
|
|
||
|
|
case _OP_ACCESS, _OP_FLUSH, _OP_RELEASE:
|
||
|
|
// Avoid upsetting the OSX mount process.
|
||
|
|
req.status = OK
|
||
|
|
default:
|
||
|
|
// We want to avoid switching off features through our
|
||
|
|
// poll hack, so don't use ENOSYS. It would be nice if
|
||
|
|
// we could transmit no error code at all, but for
|
||
|
|
// some opcodes, we'd have to invent credible data to
|
||
|
|
// return as well.
|
||
|
|
req.status = ERANGE
|
||
|
|
}
|
||
|
|
}
|