Messages in this thread | | | Subject | Re: get device from file struct | From | Silviu Craciunas <> | Date | Wed, 13 Dec 2006 13:28:59 +0100 |
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On Wed, 2006-12-13 at 12:03 +0100, Jan Engelhardt wrote: > >> >thanks for the reply, the block device can be determined with the major > >> >and minor numbers , what I would be more interested in is if one can get > >> >the net_device struct from the file struct > >> > >> Just how are you supposed to match files and network devices? > >> > > > >from the struct file you can get the struct socket and from there to the > >struct sock . > > That only applies when using PF_LOCAL sockets. > > >What I would like to find out is where the data is coming > >from (read) and where it is going to(write) or if it is even possible to > >find the net device out using the struct file. > > I really don't get what you want. > > Suppose a daemon reads from a socket (PF_INET), then there is a file descriptor > to sockfs (look into /proc/$$/fd/). Well, then you may be able to get the > struct file for that socket, but it does not connect to a regular file > (S_IFREG) at all. > > > -`J'
in fs/read_write.c, the vfs_read function does:
file->f_op->read(file, buf, count, pos);
after this call is it possible to determine where the data is coming from? e.g., the first hard disk, a pipe or from a socket. If it is a socket we are interested from which device (eth0, eth1, lo, ...) the data was received.
silviu
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