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e5dd03d199
This has been a wrapper around server_event_context() for some time now, and removing this from dummmysmbd.c assists with library dependencies. Andrew Bartlett
347 lines
9.1 KiB
C
347 lines
9.1 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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#define DBGC_CLASS DBGC_LOCKING
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#include "includes.h"
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#include "system/filesys.h"
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#include "smbd/smbd.h"
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#include "smbd/globals.h"
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#if HAVE_KERNEL_OPLOCKS_IRIX
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struct irix_oplocks_context {
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struct kernel_oplocks *ctx;
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int write_fd;
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int read_fd;
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struct fd_event *read_fde;
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bool pending;
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};
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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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TALLOC_CTX *ctx = talloc_stackframe();
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char *tmpname = NULL;
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set_effective_capability(KERNEL_OPLOCK_CAPABILITY);
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tmpname = talloc_asprintf(ctx,
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"%s/koplock.%d",
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lp_lockdir(),
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(int)sys_getpid());
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if (!tmpname) {
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TALLOC_FREE(ctx);
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return False;
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}
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if(pipe(pfd) != 0) {
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DEBUG(0,("check_kernel_oplocks: Unable to create pipe. Error "
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"was %s\n",
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strerror(errno) ));
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TALLOC_FREE(ctx);
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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 "
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"%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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TALLOC_FREE(ctx);
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return False;
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}
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unlink(tmpname);
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TALLOC_FREE(ctx);
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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 "
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"available on this machine. Disabling kernel oplock "
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"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 "
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"oplock. Error was %s. Disabling kernel oplock "
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"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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* This is bad because the file_id should always be created through the vfs
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* layer! Unfortunately, a conn struct isn't available here.
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*/
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static struct file_id file_id_create_dev(SMB_DEV_T dev, SMB_INO_T inode)
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{
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struct file_id key;
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/* the ZERO_STRUCT ensures padding doesn't break using the key as a
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* blob */
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ZERO_STRUCT(key);
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key.devid = dev;
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key.inode = inode;
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return key;
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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(struct kernel_oplocks *_ctx)
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{
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struct irix_oplocks_context *ctx = talloc_get_type(_ctx->private_data,
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struct irix_oplocks_context);
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oplock_stat_t os;
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char dummy;
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struct file_id fileid;
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files_struct *fsp;
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/*
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* TODO: is it correct to assume we only get one
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* oplock break, for each byte we read from the pipe?
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*/
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ctx->pending = false;
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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(ctx->read_fd, &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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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(ctx->read_fd, 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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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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* NOTE: this doesn't work if any VFS modules overloads
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* the file_id_create() hook!
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*/
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fileid = file_id_create_dev((SMB_DEV_T)os.os_dev,
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(SMB_INO_T)os.os_ino);
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if ((fsp = file_find_di_first(smbd_server_conn, fileid)) == 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 file_id %s gen_id = %ul",
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file_id_string_tos(&fsp->file_id),
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fsp->fh->gen_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(struct kernel_oplocks *_ctx,
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files_struct *fsp, int oplock_type)
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{
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struct irix_oplocks_context *ctx = talloc_get_type(_ctx->private_data,
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struct irix_oplocks_context);
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if (sys_fcntl_long(fsp->fh->fd, F_OPLKREG, ctx->write_fd) == -1) {
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if(errno != EAGAIN) {
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DEBUG(0,("irix_set_kernel_oplock: Unable to get "
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"kernel oplock on file %s, file_id %s "
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"gen_id = %ul. Error was %s\n",
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fsp_str_dbg(fsp),
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file_id_string_tos(&fsp->file_id),
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fsp->fh->gen_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 "
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"file %s, fd = %d, file_id = %s, "
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"gen_id = %ul. Another process had the file "
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"open.\n",
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fsp_str_dbg(fsp), fsp->fh->fd,
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file_id_string_tos(&fsp->file_id),
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fsp->fh->gen_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, file_id = %s "
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"gen_id = %ul\n",
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fsp_str_dbg(fsp), file_id_string_tos(&fsp->file_id),
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fsp->fh->gen_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(struct kernel_oplocks *_ctx,
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files_struct *fsp, int oplock_type)
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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, file_id = %s"
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"gen_id = %ul, has kernel oplock state "
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"of %x.\n", fsp_str_dbg(fsp),
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file_id_string_tos(&fsp->file_id),
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fsp->fh->gen_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 "
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"removing kernel oplock on file " );
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dbgtext("%s, file_id = %s gen_id = %ul. "
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"Error was %s\n",
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fsp_str_dbg(fsp),
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file_id_string_tos(&fsp->file_id),
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fsp->fh->gen_id,
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strerror(errno) );
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}
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}
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}
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static void irix_oplocks_read_fde_handler(struct event_context *ev,
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struct fd_event *fde,
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uint16_t flags,
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void *private_data)
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{
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struct irix_oplocks_context *ctx = talloc_get_type(private_data,
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struct irix_oplocks_context);
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files_struct *fsp;
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fsp = irix_oplock_receive_message(ctx->ctx);
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break_kernel_oplock(fsp->conn->sconn->msg_ctx, fsp);
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}
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/****************************************************************************
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Setup kernel oplocks.
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****************************************************************************/
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static const struct kernel_oplocks_ops irix_koplocks = {
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.set_oplock = irix_set_kernel_oplock,
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.release_oplock = irix_release_kernel_oplock,
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.contend_level2_oplocks_begin = NULL,
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.contend_level2_oplocks_end = NULL,
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};
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struct kernel_oplocks *irix_init_kernel_oplocks(TALLOC_CTX *mem_ctx)
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{
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struct kernel_oplocks *_ctx;
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struct irix_oplocks_context *ctx;
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int pfd[2];
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if (!irix_oplocks_available())
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return NULL;
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_ctx = talloc_zero(mem_ctx, struct kernel_oplocks);
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if (!_ctx) {
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return NULL;
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}
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ctx = talloc_zero(_ctx, struct irix_oplocks_context);
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if (!ctx) {
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talloc_free(_ctx);
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return NULL;
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}
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_ctx->ops = &irix_koplocks;
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_ctx->private_data = ctx;
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ctx->ctx = _ctx;
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if(pipe(pfd) != 0) {
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talloc_free(_ctx);
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DEBUG(0,("setup_kernel_oplock_pipe: Unable to create pipe. "
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"Error was %s\n", strerror(errno) ));
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return False;
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}
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ctx->read_fd = pfd[0];
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ctx->write_fd = pfd[1];
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ctx->read_fde = event_add_fd(server_event_context(),
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ctx,
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ctx->read_fd,
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EVENT_FD_READ,
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irix_oplocks_read_fde_handler,
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ctx);
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return _ctx;
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}
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#else
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void oplock_irix_dummy(void);
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void oplock_irix_dummy(void) {}
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#endif /* HAVE_KERNEL_OPLOCKS_IRIX */
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