/*
- Unix SMB/Netbios implementation.
- Version 3.0
+ Unix SMB/CIFS implementation.
kernel oplock processing for Linux
Copyright (C) Andrew Tridgell 2000
#if HAVE_KERNEL_OPLOCKS_LINUX
-static VOLATILE sig_atomic_t signals_received;
-static VOLATILE sig_atomic_t signals_processed;
-static VOLATILE sig_atomic_t fd_pending; /* the fd of the current pending signal */
+/* 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
#ifndef RT_SIGNAL_LEASE
-#define RT_SIGNAL_LEASE 33
+#define RT_SIGNAL_LEASE (SIGRTMIN+1)
#endif
#ifndef F_SETSIG
#endif
/****************************************************************************
-handle a LEASE signal, incrementing the signals_received and blocking the signal
+ Handle a LEASE signal, incrementing the signals_received and blocking the signal.
****************************************************************************/
+
static void signal_handler(int sig, siginfo_t *info, void *unused)
{
- BlockSignals(True, sig);
- fd_pending = (sig_atomic_t)info->si_fd;
- signals_received++;
- sys_select_signal();
+ 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);
}
/****************************************************************************
-try to gain a linux capability
+ Try to gain a linux capability.
****************************************************************************/
+
static void set_capability(unsigned capability)
{
#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;
}
}
-
/****************************************************************************
-call SETLEASE. If we get EACCES then we try setting up the right capability and
-try again
+ Call SETLEASE. If we get EACCES then we try setting up the right capability and
+ try again
****************************************************************************/
+
static int linux_setlease(int fd, int leasetype)
{
int ret;
return ret;
}
-
/****************************************************************************
* Deal with the Linux kernel <--> smbd
* oplock break protocol.
****************************************************************************/
-static BOOL linux_oplock_receive_message(fd_set *fds, char *buffer, int buffer_len)
-{
- SMB_DEV_T dev;
- SMB_INO_T inode;
- SMB_STRUCT_STAT sbuf;
- BOOL ret = True;
-
- if (signals_received == signals_processed) return False;
- if (sys_fstat((int)fd_pending,&sbuf) == -1) {
- DEBUG(0,("Invalid file descriptor %d in kernel oplock break!\n", (int)fd_pending));
- ret = False;
- goto out;
- }
-
- dev = sbuf.st_dev;
- inode = sbuf.st_ino;
-
- DEBUG(3,("receive_local_message: kernel oplock break request received for \
-dev = %x, inode = %.0f\n", (unsigned int)dev, (double)inode ));
-
- /*
- * 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 *)&dev, sizeof(dev));
- memcpy(buffer + KERNEL_OPLOCK_BREAK_INODE_OFFSET, (char *)&inode, sizeof(inode));
-
- out:
+static files_struct *linux_oplock_receive_message(fd_set *fds)
+{
+ int 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 */
- fd_pending = (sig_atomic_t)-1;
- signals_processed++;
BlockSignals(False, RT_SIGNAL_LEASE);
-
- return ret;
-}
+ return fsp;
+}
/****************************************************************************
Attempt to set an kernel oplock on a file.
****************************************************************************/
+
static BOOL linux_set_kernel_oplock(files_struct *fsp, int oplock_type)
{
- if (linux_setlease(fsp->fd, F_WRLCK) == -1) {
- DEBUG(3,("set_file_oplock: Refused oplock on file %s, fd = %d, dev = %x, \
+ 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",
- fsp->fsp_name, fsp->fd,
+ fsp->fsp_name, fsp->fh->fd,
(unsigned int)fsp->dev, (double)fsp->inode, strerror(errno)));
return False;
}
- DEBUG(3,("set_file_oplock: got kernel oplock on file %s, dev = %x, inode = %.0f\n",
- fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode));
+ 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));
return True;
}
-
/****************************************************************************
Release a kernel oplock on a file.
****************************************************************************/
+
static void linux_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_GETLEASE, 0);
- dbgtext("release_kernel_oplock: file %s, dev = %x, inode = %.0f has kernel \
+ 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, state );
+ (double)fsp->inode, fsp->file_id, state );
}
/*
* Remove the kernel oplock on this file.
*/
- if (linux_setlease(fsp->fd, F_UNLCK) == -1) {
+ if (linux_setlease(fsp->fh->fd, F_UNLCK) == -1) {
if (DEBUGLVL(0)) {
- dbgtext("release_kernel_oplock: Error when removing kernel oplock on file " );
- dbgtext("%s, dev = %x, inode = %.0f. Error was %s\n",
+ 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, strerror(errno) );
+ (double)fsp->inode, fsp->file_id, strerror(errno) );
}
}
}
-
/****************************************************************************
-parse a kernel oplock message
+ See if a oplock message is waiting.
****************************************************************************/
-static BOOL linux_kernel_oplock_parse(char *msg_start, int msg_len, SMB_INO_T *inode, SMB_DEV_T *dev)
-{
- /* 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));
- DEBUG(3,("kernel oplock break request for file dev = %x, inode = %.0f\n",
- (unsigned int)*dev, (double)*inode));
-
- return True;
-}
-
-
-/****************************************************************************
-see if a oplock message is waiting
-****************************************************************************/
static BOOL linux_oplock_msg_waiting(fd_set *fds)
{
- return signals_processed != signals_received;
+ return signals_received != 0;
}
/****************************************************************************
-see if the kernel supports oplocks
+ See if the kernel supports oplocks.
****************************************************************************/
+
static BOOL linux_oplocks_available(void)
{
int fd, ret;
fd = open("/dev/null", O_RDONLY);
- if (fd == -1) return False; /* uggh! */
+ if (fd == -1)
+ return False; /* uggh! */
ret = fcntl(fd, F_GETLEASE, 0);
close(fd);
return ret == F_UNLCK;
}
-
/****************************************************************************
-setup kernel oplocks
+ Setup kernel oplocks.
****************************************************************************/
+
struct kernel_oplocks *linux_init_kernel_oplocks(void)
{
static struct kernel_oplocks koplocks;
return NULL;
}
- act.sa_handler = NULL;
- act.sa_sigaction = signal_handler;
- act.sa_flags = SA_SIGINFO;
- if (sigaction(RT_SIGNAL_LEASE, &act, NULL) != 0) {
+ 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"));
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;
+ /* the signal can start off blocked due to a bug in bash */
+ BlockSignals(False, RT_SIGNAL_LEASE);
+
DEBUG(3,("Linux kernel oplocks enabled\n"));
return &koplocks;
}
-
-
-
#else
+ void oplock_linux_dummy(void);
+
void oplock_linux_dummy(void) {}
#endif /* HAVE_KERNEL_OPLOCKS_LINUX */
git.samba.org / samba.git / blobdiff