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
-/* these can be removed when they are in glibc headers */
-struct cap_user_header {
- uint32 version;
- int pid;
-} header;
-struct cap_user_data {
- uint32 effective;
- uint32 permitted;
- uint32 inheritable;
-} data;
-
-extern int capget(struct cap_user_header * hdrp,
- struct cap_user_data * datap);
-extern int capset(struct cap_user_header * hdrp,
- const struct cap_user_data * datap);
-
-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(RT_SIGNAL_LEASE);
+ 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
- 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"));
- return -1;
- }
-
ret = fcntl(fd, F_SETLEASE, leasetype);
if (ret == -1 && errno == EACCES) {
- set_capability(CAP_LEASE);
+ set_effective_capability(LEASE_CAPABILITY);
ret = fcntl(fd, F_SETLEASE, leasetype);
}
* oplock break protocol.
****************************************************************************/
-static files_struct *linux_oplock_receive_message(fd_set *fds)
+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;
+ 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(CONST_DISCARD(void *, &fd_pending_array[0]),
- CONST_DISCARD(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);
-
- return fsp;
+ 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->fh->fd, F_WRLCK) == -1) {
- DEBUG(3,("linux_set_kernel_oplock: Refused oplock on file %s, fd = %d, dev = %x, \
-inode = %.0f. (%s)\n",
+ 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->fsp_name, fsp->fh->fd,
- (unsigned int)fsp->dev, (double)fsp->inode, strerror(errno)));
+ 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->fh->file_id));
+ DEBUG(3,("linux_set_kernel_oplock: got kernel oplock on file %s, "
+ "file_id = %s gen_id = %lu\n",
+ fsp->fsp_name, 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)
{
if (DEBUGLVL(10)) {
/*
* oplock state of this file.
*/
int state = fcntl(fsp->fh->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->fh->file_id, state );
+ dbgtext("linux_release_kernel_oplock: file %s, file_id = %s "
+ "gen_id = %lu has kernel oplock state "
+ "of %x.\n", fsp->fsp_name, file_id_string_tos(&fsp->file_id),
+ fsp->fh->gen_id, state );
}
/*
* Remove the kernel oplock on this file.
*/
- if (linux_setlease(fsp->fh->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->fh->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->fsp_name,
+ file_id_string_tos(&fsp->file_id),
+ fsp->fh->gen_id, strerror(errno) );
}
}
}
-/****************************************************************************
- 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,
+};
+
+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.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);
git.samba.org / metze / samba / wip.git / blobdiff