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
+ 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,
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.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#define DBGC_CLASS DBGC_LOCKING
#include "includes.h"
+#include "smbd/globals.h"
#if HAVE_KERNEL_OPLOCKS_LINUX
-static SIG_ATOMIC_T signals_received;
-#define FD_PENDING_SIZE 100
-static SIG_ATOMIC_T fd_pending_array[FD_PENDING_SIZE];
-
#ifndef F_SETLEASE
#define F_SETLEASE 1024
#endif
#define F_SETSIG 10
#endif
-/****************************************************************************
- Handle a LEASE signal, incrementing the signals_received and blocking the signal.
-****************************************************************************/
-
-static void signal_handler(int sig, siginfo_t *info, void *unused)
+/*
+ * public function to get linux lease capability. Needed by some VFS modules (eg. gpfs.c)
+ */
+void linux_set_lease_capability(void)
{
- if (signals_received < FD_PENDING_SIZE - 1) {
- fd_pending_array[signals_received] = (SIG_ATOMIC_T)info->si_fd;
- signals_received++;
- } /* Else signal is lost. */
- sys_select_signal();
+ set_effective_capability(LEASE_CAPABILITY);
}
-/****************************************************************************
- Try to gain a linux capability.
-****************************************************************************/
-
-static void set_capability(unsigned capability)
+/*
+ * Call to set the kernel lease signal handler
+ */
+int linux_set_lease_sighandler(int fd)
{
-#ifndef _LINUX_CAPABILITY_VERSION
-#define _LINUX_CAPABILITY_VERSION 0x19980330
-#endif
- /* these can be removed when they are in glibc headers */
- struct {
- uint32 version;
- int pid;
- } header;
- struct {
- uint32 effective;
- uint32 permitted;
- uint32 inheritable;
- } data;
-
- header.version = _LINUX_CAPABILITY_VERSION;
- header.pid = 0;
-
- if (capget(&header, &data) == -1) {
- DEBUG(3,("Unable to get kernel capabilities (%s)\n", strerror(errno)));
- return;
- }
-
- data.effective |= (1<<capability);
+ if (fcntl(fd, F_SETSIG, RT_SIGNAL_LEASE) == -1) {
+ DEBUG(3,("Failed to set signal handler for kernel lease\n"));
+ return -1;
+ }
- if (capset(&header, &data) == -1) {
- DEBUG(3,("Unable to set %d capability (%s)\n",
- capability, strerror(errno)));
- }
+ return 0;
}
/****************************************************************************
Call SETLEASE. If we get EACCES then we try setting up the right capability and
- try again
+ try again.
+ Use the SMB_VFS_LINUX_SETLEASE instead of this call directly.
****************************************************************************/
-static int linux_setlease(int fd, int leasetype)
+int linux_setlease(int fd, int leasetype)
{
int ret;
- if (fcntl(fd, F_SETSIG, RT_SIGNAL_LEASE) == -1) {
- DEBUG(3,("Failed to set signal handler for kernel lease\n"));
+ /* First set the signal handler. */
+ if (linux_set_lease_sighandler(fd) == -1) {
return -1;
}
-
ret = fcntl(fd, F_SETLEASE, leasetype);
if (ret == -1 && errno == EACCES) {
- set_capability(CAP_LEASE);
+ set_effective_capability(LEASE_CAPABILITY);
+ /*
+ * Bug 8974 - work around Linux kernel bug
+ * https://bugzilla.kernel.org/show_bug.cgi?id=43336.
+ * "fcntl(F_SETLEASE) resets signal number when
+ * called multiple times"
+ */
+ if (linux_set_lease_sighandler(fd) == -1) {
+ return -1;
+ }
ret = fcntl(fd, F_SETLEASE, leasetype);
}
* oplock break protocol.
****************************************************************************/
-static BOOL linux_oplock_receive_message(fd_set *fds, char *buffer, int buffer_len)
+static void linux_oplock_signal_handler(struct tevent_context *ev_ctx,
+ struct tevent_signal *se,
+ int signum, int count,
+ void *_info, void *private_data)
{
- int fd;
- struct files_struct *fsp;
+ siginfo_t *info = (siginfo_t *)_info;
+ int fd = info->si_fd;
+ files_struct *fsp;
- BlockSignals(True, RT_SIGNAL_LEASE);
- fd = fd_pending_array[0];
fsp = file_find_fd(fd);
- fd_pending_array[0] = (SIG_ATOMIC_T)-1;
- if (signals_received > 1)
- memmove((void *)&fd_pending_array[0], (void *)&fd_pending_array[1],
- sizeof(SIG_ATOMIC_T)*(signals_received-1));
- signals_received--;
- /* now we can receive more signals */
- BlockSignals(False, RT_SIGNAL_LEASE);
-
if (fsp == NULL) {
- DEBUG(0,("Invalid file descriptor %d in kernel oplock break!\n", (int)fd));
- return False;
+ DEBUG(0,("linux_oplock_signal_handler: failed to find fsp for file fd=%d (file was closed ?)\n", fd ));
+ return;
}
-
- DEBUG(3,("linux_oplock_receive_message: kernel oplock break request received for \
-dev = %x, inode = %.0f fd = %d, fileid = %lu \n", (unsigned int)fsp->dev, (double)fsp->inode,
- fd, 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;
+ break_kernel_oplock(smbd_messaging_context(), fsp);
}
/****************************************************************************
Attempt to set an kernel oplock on a file.
****************************************************************************/
-static BOOL linux_set_kernel_oplock(files_struct *fsp, int oplock_type)
+static bool linux_set_kernel_oplock(struct kernel_oplocks *ctx,
+ files_struct *fsp, int oplock_type)
{
- if (linux_setlease(fsp->fd, F_WRLCK) == -1) {
- DEBUG(3,("linux_set_kernel_oplock: Refused oplock on file %s, fd = %d, dev = %x, \
-inode = %.0f. (%s)\n",
- fsp->fsp_name, fsp->fd,
- (unsigned int)fsp->dev, (double)fsp->inode, strerror(errno)));
+ if ( SMB_VFS_LINUX_SETLEASE(fsp, F_WRLCK) == -1) {
+ DEBUG(3,("linux_set_kernel_oplock: Refused oplock on file %s, "
+ "fd = %d, file_id = %s. (%s)\n",
+ fsp_str_dbg(fsp), fsp->fh->fd,
+ file_id_string_tos(&fsp->file_id),
+ strerror(errno)));
return False;
}
- DEBUG(3,("linux_set_kernel_oplock: got kernel oplock on file %s, dev = %x, inode = %.0f, file_id = %lu\n",
- fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode, fsp->file_id));
+ DEBUG(3,("linux_set_kernel_oplock: got kernel oplock on file %s, "
+ "file_id = %s gen_id = %lu\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 linux_release_kernel_oplock(files_struct *fsp)
+static void linux_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 = fcntl(fsp->fd, F_GETLEASE, 0);
- dbgtext("linux_release_kernel_oplock: file %s, dev = %x, inode = %.0f file_id = %lu has kernel \
-oplock state of %x.\n", fsp->fsp_name, (unsigned int)fsp->dev,
- (double)fsp->inode, fsp->file_id, state );
+ int state = fcntl(fsp->fh->fd, F_GETLEASE, 0);
+ dbgtext("linux_release_kernel_oplock: file %s, file_id = %s "
+ "gen_id = %lu 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 (linux_setlease(fsp->fd, F_UNLCK) == -1) {
+ if ( SMB_VFS_LINUX_SETLEASE(fsp, F_UNLCK) == -1) {
if (DEBUGLVL(0)) {
- dbgtext("linux_release_kernel_oplock: Error when removing kernel oplock on file " );
- dbgtext("%s, dev = %x, inode = %.0f, file_id = %lu. Error was %s\n",
- fsp->fsp_name, (unsigned int)fsp->dev,
- (double)fsp->inode, fsp->file_id, strerror(errno) );
+ dbgtext("linux_release_kernel_oplock: Error when "
+ "removing kernel oplock on file " );
+ dbgtext("%s, file_id = %s, gen_id = %lu. "
+ "Error was %s\n", fsp_str_dbg(fsp),
+ file_id_string_tos(&fsp->file_id),
+ fsp->fh->gen_id, strerror(errno) );
}
}
}
-/****************************************************************************
- Parse a kernel oplock message.
-****************************************************************************/
-
-static BOOL linux_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 %lu).\n",
- msg_len, (unsigned long)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(3,("kernel oplock break request for file dev = %x, inode = %.0f, file_id = %lu\n",
- (unsigned int)*dev, (double)*inode, *file_id));
-
- return True;
-}
-
-/****************************************************************************
- See if a oplock message is waiting.
-****************************************************************************/
-
-static BOOL linux_oplock_msg_waiting(fd_set *fds)
-{
- return signals_received != 0;
-}
-
/****************************************************************************
See if the kernel supports oplocks.
****************************************************************************/
-static BOOL linux_oplocks_available(void)
+static bool linux_oplocks_available(void)
{
int fd, ret;
fd = open("/dev/null", O_RDONLY);
Setup kernel oplocks.
****************************************************************************/
-struct kernel_oplocks *linux_init_kernel_oplocks(void)
+static const struct kernel_oplocks_ops linux_koplocks = {
+ .set_oplock = linux_set_kernel_oplock,
+ .release_oplock = linux_release_kernel_oplock,
+ .contend_level2_oplocks_begin = NULL,
+ .contend_level2_oplocks_end = NULL,
+};
+
+struct kernel_oplocks *linux_init_kernel_oplocks(TALLOC_CTX *mem_ctx)
{
- static struct kernel_oplocks koplocks;
- struct sigaction act;
+ struct kernel_oplocks *ctx;
+ struct tevent_signal *se;
if (!linux_oplocks_available()) {
DEBUG(3,("Linux kernel oplocks not available\n"));
return NULL;
}
- ZERO_STRUCT(act);
-
- act.sa_handler = NULL;
- act.sa_sigaction = signal_handler;
- act.sa_flags = SA_SIGINFO;
- sigemptyset( &act.sa_mask );
- if (sigaction(RT_SIGNAL_LEASE, &act, NULL) != 0) {
- DEBUG(0,("Failed to setup RT_SIGNAL_LEASE handler\n"));
+ ctx = talloc_zero(mem_ctx, struct kernel_oplocks);
+ if (!ctx) {
+ DEBUG(0,("Linux Kernel oplocks talloc_Zero failed\n"));
return NULL;
}
- koplocks.receive_message = linux_oplock_receive_message;
- koplocks.set_oplock = linux_set_kernel_oplock;
- koplocks.release_oplock = linux_release_kernel_oplock;
- koplocks.parse_message = linux_kernel_oplock_parse;
- koplocks.msg_waiting = linux_oplock_msg_waiting;
- koplocks.notification_fd = -1;
+ ctx->ops = &linux_koplocks;
+
+ se = tevent_add_signal(smbd_event_context(),
+ ctx,
+ RT_SIGNAL_LEASE, SA_SIGINFO,
+ linux_oplock_signal_handler,
+ ctx);
+ if (!se) {
+ DEBUG(0,("Failed to setup RT_SIGNAL_LEASE handler"));
+ TALLOC_FREE(ctx);
+ return NULL;
+ }
- /* the signal can start off blocked due to a bug in bash */
- BlockSignals(False, RT_SIGNAL_LEASE);
+ ctx->private_data = se;
DEBUG(3,("Linux kernel oplocks enabled\n"));
- return &koplocks;
+ return ctx;
}
#else
+ void oplock_linux_dummy(void);
+
void oplock_linux_dummy(void) {}
#endif /* HAVE_KERNEL_OPLOCKS_LINUX */
git.samba.org / samba.git / blobdiff