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/*
Unix SMB/CIFS implementation.
IRIX kernel oplock processing
Copyright (C) Andrew Tridgell 1992-1998
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"
#if HAVE_KERNEL_OPLOCKS_IRIX
static int oplock_pipe_write = -1;
static int oplock_pipe_read = -1;
/****************************************************************************
Test to see if IRIX kernel oplocks work.
****************************************************************************/
static BOOL irix_oplocks_available(void)
{
int fd;
int pfd[2];
pstring tmpname;
oplock_set_capability(True, False);
slprintf(tmpname,sizeof(tmpname)-1, "%s/koplock.%d", lp_lockdir(), (int)sys_getpid());
if(pipe(pfd) != 0) {
DEBUG(0,("check_kernel_oplocks: Unable to create pipe. Error was %s\n",
strerror(errno) ));
return False;
}
if((fd = sys_open(tmpname, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0600)) < 0) {
DEBUG(0,("check_kernel_oplocks: Unable to open temp test file %s. Error was %s\n",
tmpname, strerror(errno) ));
unlink( tmpname );
close(pfd[0]);
close(pfd[1]);
return False;
}
unlink(tmpname);
if(sys_fcntl_long(fd, F_OPLKREG, pfd[1]) == -1) {
DEBUG(0,("check_kernel_oplocks: Kernel oplocks are not available on this machine. \
Disabling kernel oplock support.\n" ));
close(pfd[0]);
close(pfd[1]);
close(fd);
return False;
}
if(sys_fcntl_long(fd, F_OPLKACK, OP_REVOKE) < 0 ) {
DEBUG(0,("check_kernel_oplocks: Error when removing kernel oplock. Error was %s. \
Disabling kernel oplock support.\n", strerror(errno) ));
close(pfd[0]);
close(pfd[1]);
close(fd);
return False;
}
close(pfd[0]);
close(pfd[1]);
close(fd);
return True;
}
/****************************************************************************
* Deal with the IRIX kernel <--> smbd
* oplock break protocol.
****************************************************************************/
static BOOL irix_oplock_receive_message(fd_set *fds, char *buffer, int buffer_len)
{
extern int smb_read_error;
oplock_stat_t os;
char dummy;
files_struct *fsp;
/*
* Read one byte of zero to clear the
* kernel break notify message.
*/
if(read(oplock_pipe_read, &dummy, 1) != 1) {
DEBUG(0,("irix_oplock_receive_message: read of kernel notification failed. \
Error was %s.\n", strerror(errno) ));
smb_read_error = READ_ERROR;
return False;
}
/*
* Do a query to get the
* device and inode of the file that has the break
* request outstanding.
*/
if(sys_fcntl_ptr(oplock_pipe_read, F_OPLKSTAT, &os) < 0) {
DEBUG(0,("irix_oplock_receive_message: fcntl of kernel notification failed. \
Error was %s.\n", strerror(errno) ));
if(errno == EAGAIN) {
/*
* Duplicate kernel break message - ignore.
*/
memset(buffer, '\0', KERNEL_OPLOCK_BREAK_MSG_LEN);
return True;
}
smb_read_error = READ_ERROR;
return False;
}
/*
* We only have device and inode info here - we have to guess that this
* is the first fsp open with this dev,ino pair.
*/
if ((fsp = file_find_di_first((SMB_DEV_T)os.os_dev, (SMB_INO_T)os.os_ino)) == NULL) {
DEBUG(0,("irix_oplock_receive_message: unable to find open file with dev = %x, inode = %.0f\n",
(unsigned int)os.os_dev, (double)os.os_ino ));
return False;
}
DEBUG(5,("irix_oplock_receive_message: kernel oplock break request received for \
dev = %x, inode = %.0f\n, file_id = %ul", (unsigned int)fsp->dev, (double)fsp->inode, fsp->file_id ));
/*
* 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 *)&fsp->dev, sizeof(fsp->dev));
memcpy(buffer + KERNEL_OPLOCK_BREAK_INODE_OFFSET, (char *)&fsp->inode, sizeof(fsp->inode));
memcpy(buffer + KERNEL_OPLOCK_BREAK_FILEID_OFFSET, (char *)&fsp->file_id, sizeof(fsp->file_id));
return True;
}
/****************************************************************************
Attempt to set an kernel oplock on a file.
****************************************************************************/
static BOOL irix_set_kernel_oplock(files_struct *fsp, int oplock_type)
{
if (sys_fcntl_long(fsp->fd, F_OPLKREG, oplock_pipe_write) == -1) {
if(errno != EAGAIN) {
DEBUG(0,("irix_set_kernel_oplock: Unable to get kernel oplock on file %s, dev = %x, \
inode = %.0f, file_id = %ul. Error was %s\n",
fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode, fsp->file_id,
strerror(errno) ));
} else {
DEBUG(5,("irix_set_kernel_oplock: Refused oplock on file %s, fd = %d, dev = %x, \
inode = %.0f, file_id = %ul. Another process had the file open.\n",
fsp->fsp_name, fsp->fd, (unsigned int)fsp->dev, (double)fsp->inode, fsp->file_id ));
}
return False;
}
DEBUG(10,("irix_set_kernel_oplock: got kernel oplock on file %s, dev = %x, inode = %.0f, file_id = %ul\n",
fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode, fsp->file_id));
return True;
}
/****************************************************************************
Release a kernel oplock on a file.
****************************************************************************/
static void irix_release_kernel_oplock(files_struct *fsp)
{
if (DEBUGLVL(10)) {
/*
* Check and print out the current kernel
* oplock state of this file.
*/
int state = sys_fcntl_long(fsp->fd, F_OPLKACK, -1);
dbgtext("irix_release_kernel_oplock: file %s, dev = %x, inode = %.0f file_id = %ul, has kernel \
oplock state of %x.\n", fsp->fsp_name, (unsigned int)fsp->dev,
(double)fsp->inode, fsp->file_id, state );
}
/*
* Remove the kernel oplock on this file.
*/
if(sys_fcntl_long(fsp->fd, F_OPLKACK, OP_REVOKE) < 0) {
if( DEBUGLVL( 0 )) {
dbgtext("irix_release_kernel_oplock: Error when removing kernel oplock on file " );
dbgtext("%s, dev = %x, inode = %.0f, file_id = %ul. Error was %s\n",
fsp->fsp_name, (unsigned int)fsp->dev,
(double)fsp->inode, fsp->file_id, strerror(errno) );
}
}
}
/****************************************************************************
Parse a kernel oplock message.
****************************************************************************/
static BOOL irix_kernel_oplock_parse(char *msg_start, int msg_len,
SMB_INO_T *inode, SMB_DEV_T *dev, unsigned long *file_id)
{
/* Ensure that the msg length is correct. */
if(msg_len != KERNEL_OPLOCK_BREAK_MSG_LEN) {
DEBUG(0,("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));
memcpy((char *)file_id, msg_start+KERNEL_OPLOCK_BREAK_FILEID_OFFSET, sizeof(*file_id));
DEBUG(5,("kernel oplock break request for file dev = %x, inode = %.0f, file_id = %ul\n",
(unsigned int)*dev, (double)*inode, *file_id));
return True;
}
/****************************************************************************
Set *maxfd to include oplock read pipe.
****************************************************************************/
static BOOL irix_oplock_msg_waiting(fd_set *fds)
{
if (oplock_pipe_read == -1)
return False;
return FD_ISSET(oplock_pipe_read,fds);
}
/****************************************************************************
Setup kernel oplocks.
****************************************************************************/
struct kernel_oplocks *irix_init_kernel_oplocks(void)
{
int pfd[2];
static struct kernel_oplocks koplocks;
if (!irix_oplocks_available())
return NULL;
if(pipe(pfd) != 0) {
DEBUG(0,("setup_kernel_oplock_pipe: Unable to create pipe. Error was %s\n",
strerror(errno) ));
return False;
}
oplock_pipe_read = pfd[0];
oplock_pipe_write = pfd[1];
koplocks.receive_message = irix_oplock_receive_message;
koplocks.set_oplock = irix_set_kernel_oplock;
koplocks.release_oplock = irix_release_kernel_oplock;
koplocks.parse_message = irix_kernel_oplock_parse;
koplocks.msg_waiting = irix_oplock_msg_waiting;
koplocks.notification_fd = oplock_pipe_read;
return &koplocks;
}
#else
void oplock_irix_dummy(void) {}
#endif /* HAVE_KERNEL_OPLOCKS_IRIX */
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