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cc9ea93456
fsp pointers. Ensure we cope with this to pass Samba4
DENY tests (we used to pass these, there must have been
a regression with newer code). We now pass them.
Jeremy
(This used to be commit fd6fa1d4ea
)
271 lines
7.9 KiB
C
271 lines
7.9 KiB
C
/*
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Unix SMB/CIFS implementation.
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IRIX kernel oplock processing
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Copyright (C) Andrew Tridgell 1992-1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define DBGC_CLASS DBGC_LOCKING
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#include "includes.h"
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#if HAVE_KERNEL_OPLOCKS_IRIX
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static int oplock_pipe_write = -1;
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static int oplock_pipe_read = -1;
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/****************************************************************************
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Test to see if IRIX kernel oplocks work.
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****************************************************************************/
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static BOOL irix_oplocks_available(void)
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{
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int fd;
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int pfd[2];
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pstring tmpname;
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set_effective_capability(KERNEL_OPLOCK_CAPABILITY);
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slprintf(tmpname,sizeof(tmpname)-1, "%s/koplock.%d", lp_lockdir(), (int)sys_getpid());
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if(pipe(pfd) != 0) {
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DEBUG(0,("check_kernel_oplocks: Unable to create pipe. Error was %s\n",
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strerror(errno) ));
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return False;
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}
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if((fd = sys_open(tmpname, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0600)) < 0) {
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DEBUG(0,("check_kernel_oplocks: Unable to open temp test file %s. Error was %s\n",
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tmpname, strerror(errno) ));
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unlink( tmpname );
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close(pfd[0]);
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close(pfd[1]);
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return False;
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}
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unlink(tmpname);
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if(sys_fcntl_long(fd, F_OPLKREG, pfd[1]) == -1) {
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DEBUG(0,("check_kernel_oplocks: Kernel oplocks are not available on this machine. \
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Disabling kernel oplock support.\n" ));
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close(pfd[0]);
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close(pfd[1]);
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close(fd);
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return False;
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}
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if(sys_fcntl_long(fd, F_OPLKACK, OP_REVOKE) < 0 ) {
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DEBUG(0,("check_kernel_oplocks: Error when removing kernel oplock. Error was %s. \
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Disabling kernel oplock support.\n", strerror(errno) ));
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close(pfd[0]);
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close(pfd[1]);
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close(fd);
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return False;
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}
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close(pfd[0]);
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close(pfd[1]);
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close(fd);
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return True;
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}
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/****************************************************************************
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* Deal with the IRIX kernel <--> smbd
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* oplock break protocol.
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****************************************************************************/
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static files_struct *irix_oplock_receive_message(fd_set *fds)
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{
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extern int smb_read_error;
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oplock_stat_t os;
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char dummy;
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files_struct *fsp;
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/* Ensure we only get one call per select fd set. */
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FD_CLR(oplock_pipe_read, fds);
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/*
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* Read one byte of zero to clear the
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* kernel break notify message.
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*/
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if(read(oplock_pipe_read, &dummy, 1) != 1) {
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DEBUG(0,("irix_oplock_receive_message: read of kernel "
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"notification failed. Error was %s.\n",
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strerror(errno) ));
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smb_read_error = READ_ERROR;
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return NULL;
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}
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/*
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* Do a query to get the
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* device and inode of the file that has the break
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* request outstanding.
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*/
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if(sys_fcntl_ptr(oplock_pipe_read, F_OPLKSTAT, &os) < 0) {
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DEBUG(0,("irix_oplock_receive_message: fcntl of kernel "
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"notification failed. Error was %s.\n",
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strerror(errno) ));
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if(errno == EAGAIN) {
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/*
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* Duplicate kernel break message - ignore.
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*/
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return NULL;
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}
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smb_read_error = READ_ERROR;
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return NULL;
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}
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/*
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* We only have device and inode info here - we have to guess that this
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* is the first fsp open with this dev,ino pair.
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*/
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if ((fsp = file_find_di_first((SMB_DEV_T)os.os_dev,
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(SMB_INO_T)os.os_ino)) == NULL) {
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DEBUG(0,("irix_oplock_receive_message: unable to find open "
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"file with dev = %x, inode = %.0f\n",
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(unsigned int)os.os_dev, (double)os.os_ino ));
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return NULL;
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}
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DEBUG(5,("irix_oplock_receive_message: kernel oplock break request "
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"received for dev = %x, inode = %.0f\n, file_id = %ul",
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(unsigned int)fsp->dev, (double)fsp->inode, fsp->fh->file_id ));
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return fsp;
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}
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/****************************************************************************
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Attempt to set an kernel oplock on a file.
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****************************************************************************/
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static BOOL irix_set_kernel_oplock(files_struct *fsp, int oplock_type)
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{
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if (sys_fcntl_long(fsp->fh->fd, F_OPLKREG, oplock_pipe_write) == -1) {
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if(errno != EAGAIN) {
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DEBUG(0,("irix_set_kernel_oplock: Unable to get kernel oplock on file %s, dev = %x, \
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inode = %.0f, file_id = %ul. Error was %s\n",
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fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode, fsp->fh->file_id,
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strerror(errno) ));
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} else {
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DEBUG(5,("irix_set_kernel_oplock: Refused oplock on file %s, fd = %d, dev = %x, \
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inode = %.0f, file_id = %ul. Another process had the file open.\n",
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fsp->fsp_name, fsp->fh->fd, (unsigned int)fsp->dev, (double)fsp->inode, fsp->fh->file_id ));
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}
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return False;
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}
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DEBUG(10,("irix_set_kernel_oplock: got kernel oplock on file %s, dev = %x, inode = %.0f, file_id = %ul\n",
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fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode, fsp->fh->file_id));
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return True;
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}
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/****************************************************************************
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Release a kernel oplock on a file.
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****************************************************************************/
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static void irix_release_kernel_oplock(files_struct *fsp)
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{
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if (DEBUGLVL(10)) {
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/*
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* Check and print out the current kernel
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* oplock state of this file.
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*/
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int state = sys_fcntl_long(fsp->fh->fd, F_OPLKACK, -1);
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dbgtext("irix_release_kernel_oplock: file %s, dev = %x, inode = %.0f file_id = %ul, has kernel \
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oplock state of %x.\n", fsp->fsp_name, (unsigned int)fsp->dev,
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(double)fsp->inode, fsp->fh->file_id, state );
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}
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/*
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* Remove the kernel oplock on this file.
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*/
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if(sys_fcntl_long(fsp->fh->fd, F_OPLKACK, OP_REVOKE) < 0) {
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if( DEBUGLVL( 0 )) {
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dbgtext("irix_release_kernel_oplock: Error when removing kernel oplock on file " );
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dbgtext("%s, dev = %x, inode = %.0f, file_id = %ul. Error was %s\n",
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fsp->fsp_name, (unsigned int)fsp->dev,
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(double)fsp->inode, fsp->fh->file_id, strerror(errno) );
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}
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}
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}
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/****************************************************************************
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See if there is a message waiting in this fd set.
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Note that fds MAY BE NULL ! If so we must do our own select.
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****************************************************************************/
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static BOOL irix_oplock_msg_waiting(fd_set *fds)
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{
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int selrtn;
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fd_set myfds;
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struct timeval to;
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if (oplock_pipe_read == -1)
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return False;
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if (fds) {
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return FD_ISSET(oplock_pipe_read, fds);
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}
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/* Do a zero-time select. We just need to find out if there
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* are any outstanding messages. We use sys_select_intr as
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* we need to ignore any signals. */
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FD_ZERO(&myfds);
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FD_SET(oplock_pipe_read, &myfds);
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to = timeval_set(0, 0);
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selrtn = sys_select_intr(oplock_pipe_read+1,&myfds,NULL,NULL,&to);
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return (selrtn == 1) ? True : False;
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}
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/****************************************************************************
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Setup kernel oplocks.
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****************************************************************************/
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struct kernel_oplocks *irix_init_kernel_oplocks(void)
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{
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int pfd[2];
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static struct kernel_oplocks koplocks;
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if (!irix_oplocks_available())
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return NULL;
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if(pipe(pfd) != 0) {
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DEBUG(0,("setup_kernel_oplock_pipe: Unable to create pipe. Error was %s\n",
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strerror(errno) ));
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return False;
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}
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oplock_pipe_read = pfd[0];
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oplock_pipe_write = pfd[1];
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koplocks.receive_message = irix_oplock_receive_message;
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koplocks.set_oplock = irix_set_kernel_oplock;
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koplocks.release_oplock = irix_release_kernel_oplock;
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koplocks.msg_waiting = irix_oplock_msg_waiting;
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koplocks.notification_fd = oplock_pipe_read;
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return &koplocks;
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}
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#else
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void oplock_irix_dummy(void) {}
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#endif /* HAVE_KERNEL_OPLOCKS_IRIX */
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