Hello,
write() from cifs kernel driver blocks when disconnecting the cifs server. The blocking call didn't return after 30 minutes. Client and server are connected via a switch and server's LAN cable is unplugged during the write call. I use kernel 3.11.8 and mounted without "hard" option.
Is there a possibility for an non-blocking write() without using O_SYNC or "directio" mount option?
Way to reproduce the scenario: Below is a sample program which calls write() in a loop. The error messages appear when unplugging the cable during this loop.
Kind regards,
Hagen
CIFS VFS: sends on sock ffff88003710c280 stuck for 15 seconds
CIFS VFS: Error -11 sending data on socket to server
#include <fstream>
#include <iostream>
int main () {
const int size = 100000;
char buffer[size];
std::ofstream outfile("/mnt/new.bin",std::ofstream::binary);
if (!outfile.is_open())
{
return 1;
}
for (int idx=0; idx<10000 && outfile.good(); idx++)
{
outfile.write(buffer,size);
std::cout << "written, size=" << size << std::endl;
}
std::cout << "finished " << outfile.good() << std::endl;
outfile.close();
return 0;
}
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