+++ /dev/null
-/*
- 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 3 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, see <http://www.gnu.org/licenses/>.
-*/
-
-#define DBGC_CLASS DBGC_LOCKING
-#include "includes.h"
-#include "system/filesys.h"
-#include "smbd/smbd.h"
-#include "smbd/globals.h"
-
-#if HAVE_KERNEL_OPLOCKS_IRIX
-
-struct irix_oplocks_context {
- struct kernel_oplocks *ctx;
- struct smbd_server_connection *sconn;
- int write_fd;
- int read_fd;
- struct tevent_fd *read_fde;
- bool pending;
-};
-
-/****************************************************************************
- Test to see if IRIX kernel oplocks work.
-****************************************************************************/
-
-static bool irix_oplocks_available(void)
-{
- int fd;
- int pfd[2];
- TALLOC_CTX *ctx = talloc_stackframe();
- char *tmpname = NULL;
-
- set_effective_capability(KERNEL_OPLOCK_CAPABILITY);
-
- tmpname = talloc_asprintf(ctx,
- "%s/koplock.%d",
- lp_lock_directory(),
- (int)getpid());
- if (!tmpname) {
- TALLOC_FREE(ctx);
- return False;
- }
-
- if(pipe(pfd) != 0) {
- DEBUG(0,("check_kernel_oplocks: Unable to create pipe. Error "
- "was %s\n",
- strerror(errno) ));
- TALLOC_FREE(ctx);
- return False;
- }
-
- if((fd = 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]);
- TALLOC_FREE(ctx);
- return False;
- }
-
- unlink(tmpname);
-
- TALLOC_FREE(ctx);
-
- 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;
-}
-
-/*
- * This is bad because the file_id should always be created through the vfs
- * layer! Unfortunately, a conn struct isn't available here.
- */
-static struct file_id file_id_create_dev(SMB_DEV_T dev, SMB_INO_T inode)
-{
- struct file_id key;
-
- /* the ZERO_STRUCT ensures padding doesn't break using the key as a
- * blob */
- ZERO_STRUCT(key);
-
- key.devid = dev;
- key.inode = inode;
-
- return key;
-}
-
-/****************************************************************************
- * Deal with the IRIX kernel <--> smbd
- * oplock break protocol.
-****************************************************************************/
-
-static files_struct *irix_oplock_receive_message(struct kernel_oplocks *_ctx)
-{
- struct irix_oplocks_context *ctx = talloc_get_type(_ctx->private_data,
- struct irix_oplocks_context);
- oplock_stat_t os;
- char dummy;
- struct file_id fileid;
- files_struct *fsp;
-
- /*
- * TODO: is it correct to assume we only get one
- * oplock break, for each byte we read from the pipe?
- */
- ctx->pending = false;
-
- /*
- * Read one byte of zero to clear the
- * kernel break notify message.
- */
-
- if(read(ctx->read_fd, &dummy, 1) != 1) {
- DEBUG(0,("irix_oplock_receive_message: read of kernel "
- "notification failed. Error was %s.\n",
- strerror(errno) ));
- return NULL;
- }
-
- /*
- * Do a query to get the
- * device and inode of the file that has the break
- * request outstanding.
- */
-
- if(sys_fcntl_ptr(ctx->read_fd, 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.
- */
- return NULL;
- }
- return NULL;
- }
-
- /*
- * We only have device and inode info here - we have to guess that this
- * is the first fsp open with this dev,ino pair.
- *
- * NOTE: this doesn't work if any VFS modules overloads
- * the file_id_create() hook!
- */
-
- fileid = file_id_create_dev((SMB_DEV_T)os.os_dev,
- (SMB_INO_T)os.os_ino);
- if ((fsp = file_find_di_first(ctx->sconn, fileid)) == 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 NULL;
- }
-
- DEBUG(5,("irix_oplock_receive_message: kernel oplock break request "
- "received for file_id %s gen_id = %ul",
- file_id_string_tos(&fsp->file_id),
- fsp->fh->gen_id ));
-
- return fsp;
-}
-
-/****************************************************************************
- Attempt to set an kernel oplock on a file.
-****************************************************************************/
-
-static bool irix_set_kernel_oplock(struct kernel_oplocks *_ctx,
- files_struct *fsp, int oplock_type)
-{
- struct irix_oplocks_context *ctx = talloc_get_type(_ctx->private_data,
- struct irix_oplocks_context);
-
- if (sys_fcntl_long(fsp->fh->fd, F_OPLKREG, ctx->write_fd) == -1) {
- if(errno != EAGAIN) {
- DEBUG(0,("irix_set_kernel_oplock: Unable to get "
- "kernel oplock on file %s, file_id %s "
- "gen_id = %ul. Error was %s\n",
- fsp_str_dbg(fsp),
- file_id_string_tos(&fsp->file_id),
- fsp->fh->gen_id,
- strerror(errno) ));
- } else {
- DEBUG(5,("irix_set_kernel_oplock: Refused oplock on "
- "file %s, fd = %d, file_id = %s, "
- "gen_id = %ul. Another process had the file "
- "open.\n",
- fsp_str_dbg(fsp), fsp->fh->fd,
- file_id_string_tos(&fsp->file_id),
- fsp->fh->gen_id ));
- }
- return False;
- }
-
- DEBUG(10,("irix_set_kernel_oplock: got kernel oplock on file %s, file_id = %s "
- "gen_id = %ul\n",
- fsp_str_dbg(fsp), file_id_string_tos(&fsp->file_id),
- fsp->fh->gen_id));
-
- return True;
-}
-
-/****************************************************************************
- Release a kernel oplock on a file.
-****************************************************************************/
-
-static void irix_release_kernel_oplock(struct kernel_oplocks *_ctx,
- files_struct *fsp, int oplock_type)
-{
- if (DEBUGLVL(10)) {
- /*
- * Check and print out the current kernel
- * oplock state of this file.
- */
- int state = sys_fcntl_long(fsp->fh->fd, F_OPLKACK, -1);
- dbgtext("irix_release_kernel_oplock: file %s, file_id = %s"
- "gen_id = %ul, has kernel oplock state "
- "of %x.\n", fsp_str_dbg(fsp),
- file_id_string_tos(&fsp->file_id),
- fsp->fh->gen_id, state );
- }
-
- /*
- * Remove the kernel oplock on this file.
- */
- if(sys_fcntl_long(fsp->fh->fd, F_OPLKACK, OP_REVOKE) < 0) {
- if( DEBUGLVL( 0 )) {
- dbgtext("irix_release_kernel_oplock: Error when "
- "removing kernel oplock on file " );
- dbgtext("%s, file_id = %s gen_id = %ul. "
- "Error was %s\n",
- fsp_str_dbg(fsp),
- file_id_string_tos(&fsp->file_id),
- fsp->fh->gen_id,
- strerror(errno) );
- }
- }
-}
-
-static void irix_oplocks_read_fde_handler(struct tevent_context *ev,
- struct tevent_fd *fde,
- uint16_t flags,
- void *private_data)
-{
- struct irix_oplocks_context *ctx = talloc_get_type(private_data,
- struct irix_oplocks_context);
- files_struct *fsp;
-
- fsp = irix_oplock_receive_message(ctx->ctx);
- break_kernel_oplock(ctx->sconn->msg_ctx, fsp);
-}
-
-/****************************************************************************
- Setup kernel oplocks.
-****************************************************************************/
-
-static const struct kernel_oplocks_ops irix_koplocks = {
- .set_oplock = irix_set_kernel_oplock,
- .release_oplock = irix_release_kernel_oplock,
- .contend_level2_oplocks_begin = NULL,
- .contend_level2_oplocks_end = NULL,
-};
-
-struct kernel_oplocks *irix_init_kernel_oplocks(struct smbd_server_connection *sconn)
-{
- struct kernel_oplocks *_ctx;
- struct irix_oplocks_context *ctx;
- int pfd[2];
-
- if (!irix_oplocks_available())
- return NULL;
-
- _ctx = talloc_zero(sconn, struct kernel_oplocks);
- if (!_ctx) {
- return NULL;
- }
-
- ctx = talloc_zero(_ctx, struct irix_oplocks_context);
- if (!ctx) {
- talloc_free(_ctx);
- return NULL;
- }
- _ctx->ops = &irix_koplocks;
- _ctx->private_data = ctx;
- ctx->ctx = _ctx;
- ctx->sconn = sconn;
-
- if(pipe(pfd) != 0) {
- talloc_free(_ctx);
- DEBUG(0,("setup_kernel_oplock_pipe: Unable to create pipe. "
- "Error was %s\n", strerror(errno) ));
- return False;
- }
-
- ctx->read_fd = pfd[0];
- ctx->write_fd = pfd[1];
-
- ctx->read_fde = tevent_add_fd(sconn->ev_ctx,
- ctx,
- ctx->read_fd,
- TEVENT_FD_READ,
- irix_oplocks_read_fde_handler,
- ctx);
- return _ctx;
-}
-#else
- void oplock_irix_dummy(void);
- void oplock_irix_dummy(void) {}
-#endif /* HAVE_KERNEL_OPLOCKS_IRIX */
git.samba.org / samba.git / commitdiff