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#define OLD_NTDOMAIN 1
#if HAVE_KERNEL_OPLOCKS_LINUX
/*
Unix SMB/Netbios implementation.
Version 3.0
kernel oplock processing for Linux
Copyright (C) Andrew Tridgell 2000
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
extern int DEBUGLEVEL;
static unsigned signals_received;
static unsigned signals_processed;
static int fd_pending; /* the fd of the current pending SIGIO */
/****************************************************************************
handle a SIGIO, incrementing the signals_received and blocking SIGIO
****************************************************************************/
static void sigio_handler(int signal, siginfo_t *info, void *unused)
{
fd_pending = info->si_fd;
signals_received++;
BlockSignals(True, SIGIO);
}
/****************************************************************************
* Deal with the Linux kernel <--> smbd
* oplock break protocol.
****************************************************************************/
static BOOL linux_oplock_receive_message(fd_set *fds, char *buffer, int buffer_len)
{
SMB_DEV_T dev;
SMB_INO_T inode;
SMB_STRUCT_STAT sbuf;
BOOL ret;
if (signals_received == signals_processed) return False;
if (sys_fstat(fd_pending,&sbuf) == -1) {
DEBUG(0,("Invalid file descriptor %d in kernel oplock break!\n", fd_pending));
ret = False;
goto out;
}
dev = sbuf.st_dev;
inode = sbuf.st_ino;
DEBUG(5,("receive_local_message: kernel oplock break request received for \
dev = %x, inode = %.0f\n", (unsigned int)dev, (double)inode ));
/*
* Create a kernel oplock break message.
*/
/* Setup the message header */
SIVAL(buffer,OPBRK_CMD_LEN_OFFSET,KERNEL_OPLOCK_BREAK_MSG_LEN);
SSVAL(buffer,OPBRK_CMD_PORT_OFFSET,0);
buffer += OPBRK_CMD_HEADER_LEN;
SSVAL(buffer,OPBRK_MESSAGE_CMD_OFFSET,KERNEL_OPLOCK_BREAK_CMD);
memcpy(buffer + KERNEL_OPLOCK_BREAK_DEV_OFFSET, (char *)&dev, sizeof(dev));
memcpy(buffer + KERNEL_OPLOCK_BREAK_INODE_OFFSET, (char *)&inode, sizeof(inode));
out:
/* now we can receive more signals */
fd_pending = -1;
signals_processed++;
BlockSignals(False, SIGIO);
return True;
}
/****************************************************************************
Attempt to set an kernel oplock on a file.
****************************************************************************/
static BOOL linux_set_kernel_oplock(files_struct *fsp, int oplock_type)
{
if (fcntl(fsp->fd, F_SETLEASE, F_WRLCK) == -1) {
DEBUG(5,("set_file_oplock: Refused oplock on file %s, fd = %d, dev = %x, \
inode = %.0f.\n",
fsp->fsp_name, fsp->fd, (unsigned int)fsp->dev, (double)fsp->inode));
return False;
}
DEBUG(10,("set_file_oplock: got kernel oplock on file %s, dev = %x, inode = %.0f\n",
fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode));
return True;
}
/****************************************************************************
Release a kernel oplock on a file.
****************************************************************************/
static void linux_release_kernel_oplock(files_struct *fsp)
{
if (DEBUGLVL(10)) {
/*
* Check and print out the current kernel
* oplock state of this file.
*/
int state = fcntl(fsp->fd, F_GETLEASE, 0);
dbgtext("release_kernel_oplock: file %s, dev = %x, inode = %.0f has kernel \
oplock state of %x.\n", fsp->fsp_name, (unsigned int)fsp->dev,
(double)fsp->inode, state );
}
/*
* Remove the kernel oplock on this file.
*/
if (fcntl(fsp->fd, F_SETLEASE, F_UNLCK) == -1) {
if (DEBUGLVL(0)) {
dbgtext("release_kernel_oplock: Error when removing kernel oplock on file " );
dbgtext("%s, dev = %x, inode = %.0f. Error was %s\n",
fsp->fsp_name, (unsigned int)fsp->dev,
(double)fsp->inode, strerror(errno) );
}
}
}
/****************************************************************************
parse a kernel oplock message
****************************************************************************/
static BOOL linux_kernel_oplock_parse(char *msg_start, int msg_len, SMB_INO_T *inode, SMB_DEV_T *dev)
{
/* Ensure that the msg length is correct. */
if (msg_len != KERNEL_OPLOCK_BREAK_MSG_LEN) {
DEBUG(0,("process_local_message: incorrect length for KERNEL_OPLOCK_BREAK_CMD (was %d, \
should be %d).\n", msg_len, KERNEL_OPLOCK_BREAK_MSG_LEN));
return False;
}
memcpy((char *)inode, msg_start+KERNEL_OPLOCK_BREAK_INODE_OFFSET, sizeof(*inode));
memcpy((char *)dev, msg_start+KERNEL_OPLOCK_BREAK_DEV_OFFSET, sizeof(*dev));
DEBUG(5,("process_local_message: kernel oplock break request for \
file dev = %x, inode = %.0f\n", (unsigned int)dev, (double)inode));
return True;
}
/****************************************************************************
see if a oplock message is waiting
****************************************************************************/
static BOOL linux_oplock_msg_waiting(fd_set *fds)
{
return signals_processed != signals_received;
}
/****************************************************************************
setup kernel oplocks
****************************************************************************/
struct kernel_oplocks *linux_init_kernel_oplocks(void)
{
static struct kernel_oplocks koplocks;
struct sigaction act;
act.sa_handler = NULL;
act.sa_sigaction = sigio_handler;
act.sa_flags = SA_SIGINFO;
if (sigaction(SIGIO, &act, NULL) != 0) {
DEBUG(0,("Failed to setup SIGIO handler\n"));
return NULL;
}
koplocks.receive_message = linux_oplock_receive_message;
koplocks.set_oplock = linux_set_kernel_oplock;
koplocks.release_oplock = linux_release_kernel_oplock;
koplocks.parse_message = linux_kernel_oplock_parse;
koplocks.msg_waiting = linux_oplock_msg_waiting;
koplocks.notification_fd = -1;
return &koplocks;
}
#else
void oplock_linux_dummy(void) {}
#endif /* HAVE_KERNEL_OPLOCKS_LINUX */
#undef OLD_NTDOMAIN
|
