diff options
Diffstat (limited to 'source3/smbd/oplock_irix.c')
| -rw-r--r-- | source3/smbd/oplock_irix.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/source3/smbd/oplock_irix.c b/source3/smbd/oplock_irix.c new file mode 100644 index 0000000000..14f6de27c4 --- /dev/null +++ b/source3/smbd/oplock_irix.c @@ -0,0 +1,285 @@ +/* + 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(fcntl(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(fcntl(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,("receive_local_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(fcntl(oplock_pipe_read, F_OPLKSTAT, &os) < 0) { + DEBUG(0,("receive_local_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,("receive_local_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,("receive_local_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 (fcntl(fsp->fd, F_OPLKREG, oplock_pipe_write) == -1) { + if(errno != EAGAIN) { + DEBUG(0,("set_file_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,("set_file_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,("set_file_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 = fcntl(fsp->fd, F_OPLKACK, -1); + dbgtext("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(fcntl(fsp->fd, F_OPLKACK, OP_REVOKE) < 0) { + if( DEBUGLVL( 0 )) { + dbgtext("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 */ |