enable the Linux change notify code and change some notify debug code

(This used to be commit c6be511fcc1be79619a0184f03d4c33dbfe12f04)

3 files changed, 64 insertions, 15 deletions

diff --git a/source3/smbd/notify.c b/source3/smbd/notify.c
index 40867a71ee..c577d0aef3 100644
--- a/source3/smbd/notify.c
+++ b/source3/smbd/notify.c
@@ -212,7 +212,10 @@ initialise the change notify subsystem
 ****************************************************************************/
 BOOL init_change_notify(void)
 {
-	cnotify = hash_notify_init();
+#if HAVE_KERNEL_CHANGE_NOTIFY
+	cnotify = kernel_notify_init();
+#endif
+	if (!cnotify) cnotify = hash_notify_init();
 	
 	if (!cnotify) {
 		DEBUG(0,("Failed to init change notify system\n"));
diff --git a/source3/smbd/notify_kernel.c b/source3/smbd/notify_kernel.c
index 7732bc646f..f78198f207 100644
--- a/source3/smbd/notify_kernel.c
+++ b/source3/smbd/notify_kernel.c
@@ -43,6 +43,14 @@ static unsigned signals_processed;
 #define RT_SIGNAL_NOTIFY 34
 #endif
 
+#ifndef F_SETSIG
+#define F_SETSIG 10
+#endif
+
+#ifndef F_NOTIFY
+#define F_NOTIFY 1026
+#endif
+
 /****************************************************************************
  This is the structure to keep the information needed to
  determine if a directory has changed.
@@ -73,6 +81,8 @@ static BOOL kernel_check_notify(connection_struct *conn, uint16 vuid, char *path
 
 	if (data->directory_handle != fd_pending) return False;
 
+	DEBUG(3,("kernel change notify on %s fd=%d\n", path, fd_pending));
+
 	close(fd_pending);
 	data->directory_handle = fd_pending = -1;
 	signals_processed++;
@@ -86,15 +96,17 @@ remove a change notify data structure
 static void kernel_remove_notify(void *datap)
 {
 	struct change_data *data = (struct change_data *)datap;
-	if (data->directory_handle != -1) {
-		if (data->directory_handle == fd_pending) {
-			data->directory_handle = fd_pending = -1;
+	int fd = data->directory_handle;
+	if (fd != -1) {
+		if (fd == fd_pending) {
+			fd_pending = -1;
 			signals_processed++;
 			BlockSignals(False, RT_SIGNAL_NOTIFY);
 		}
-		close(data->directory_handle);
+		close(fd);
 	}
 	free(data);
+	DEBUG(3,("removed kernel change notify fd=%d\n", fd));
 }
 
 
@@ -107,10 +119,10 @@ static void *kernel_register_notify(connection_struct *conn, char *path, uint32
 	int fd;
 	unsigned long kernel_flags;
 	
-	fd = dos_open(fsp->fsp_name, O_RDONLY, 0);
+	fd = dos_open(path, O_RDONLY, 0);
 
 	if (fd == -1) {
-		DEBUG(3,("Failed to open directory %s for change notify\n", fsp->fsp_name));
+		DEBUG(3,("Failed to open directory %s for change notify\n", path));
 		return NULL;
 	}
 
@@ -120,8 +132,8 @@ static void *kernel_register_notify(connection_struct *conn, char *path, uint32
 	}
 
 	kernel_flags = 0;
-	if (flags & FILE_NOTIFY_CHANGE_FILE_NAME)   kernel_flags |= DN_RENAME;
-	if (flags & FILE_NOTIFY_CHANGE_DIR_NAME)    kernel_flags |= DN_RENAME;
+	if (flags & FILE_NOTIFY_CHANGE_FILE_NAME)   kernel_flags |= DN_RENAME|DN_DELETE;
+	if (flags & FILE_NOTIFY_CHANGE_DIR_NAME)    kernel_flags |= DN_RENAME|DN_DELETE;
 	if (flags & FILE_NOTIFY_CHANGE_ATTRIBUTES)  kernel_flags |= DN_MODIFY;
 	if (flags & FILE_NOTIFY_CHANGE_SIZE)        kernel_flags |= DN_MODIFY;
 	if (flags & FILE_NOTIFY_CHANGE_LAST_WRITE)  kernel_flags |= DN_MODIFY;
@@ -133,11 +145,32 @@ static void *kernel_register_notify(connection_struct *conn, char *path, uint32
 		return NULL;
 	}
 
+	if (fcntl(fd, F_SETOWN, sys_getpid()) == -1) {
+		DEBUG(3,("Failed to set owner for change notify\n"));
+		return NULL;
+	}
+
 	data.directory_handle = fd;
 
+	DEBUG(3,("kernel change notify on %s (flags=0x%x) fd=%d\n", 
+		 path, (int)kernel_flags, fd));
+
 	return (void *)memdup(&data, sizeof(data));
 }
 
+/****************************************************************************
+see if the kernel supports change notify
+****************************************************************************/
+static BOOL kernel_notify_available(void) 
+{
+	int fd, ret;
+	fd = open("/tmp", O_RDONLY);
+	if (fd == -1) return False; /* uggh! */
+	ret = fcntl(fd, F_NOTIFY, 0);
+	close(fd);
+	return ret == 0 || errno != EINVAL;
+}
+
 
 /****************************************************************************
 setup kernel based change notify
@@ -147,6 +180,8 @@ struct cnotify_fns *kernel_notify_init(void)
 	static struct cnotify_fns cnotify;
         struct sigaction act;
 
+	if (!kernel_notify_available()) return NULL;
+
         act.sa_handler = NULL;
         act.sa_sigaction = signal_handler;
         act.sa_flags = SA_SIGINFO;
diff --git a/source3/smbd/oplock_linux.c b/source3/smbd/oplock_linux.c
index de2a4300a7..c53dd1c57f 100644
--- a/source3/smbd/oplock_linux.c
+++ b/source3/smbd/oplock_linux.c
@@ -47,6 +47,10 @@ static int fd_pending; /* the fd of the current pending signal */
 #define RT_SIGNAL_LEASE 33
 #endif
 
+#ifndef F_SETSIG
+#define F_SETSIG 10
+#endif
+
 /****************************************************************************
 handle a LEASE signal, incrementing the signals_received and blocking the signal
 ****************************************************************************/
@@ -60,8 +64,7 @@ static void signal_handler(int signal, siginfo_t *info, void *unused)
 
 /****************************************************************************
 try to gain a linux capability
-****************************************************************************/
-static void set_capability(unsigned capability)
+****************************************************************************/static void set_capability(unsigned capability)
 {
 #ifndef _LINUX_CAPABILITY_VERSION
 #define _LINUX_CAPABILITY_VERSION 0x19980330
@@ -101,6 +104,12 @@ try again
 static 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);
@@ -133,7 +142,7 @@ static BOOL linux_oplock_receive_message(fd_set *fds, char *buffer, int buffer_l
 	dev = sbuf.st_dev;
 	inode = sbuf.st_ino;
      
-	DEBUG(5,("receive_local_message: kernel oplock break request received for \
+	DEBUG(3,("receive_local_message: kernel oplock break request received for \
 dev = %x, inode = %.0f\n", (unsigned int)dev, (double)inode ));
      
 	/*
@@ -167,14 +176,14 @@ dev = %x, inode = %.0f\n", (unsigned int)dev, (double)inode ));
 static BOOL linux_set_kernel_oplock(files_struct *fsp, int oplock_type)
 {
 	if (linux_setlease(fsp->fd, F_WRLCK) == -1) {
-		DEBUG(5,("set_file_oplock: Refused oplock on file %s, fd = %d, dev = %x, \
+		DEBUG(3,("set_file_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)));
 		return False;
 	}
 	
-	DEBUG(10,("set_file_oplock: got kernel oplock on file %s, dev = %x, inode = %.0f\n",
+	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));
 
 	return True;
@@ -226,7 +235,7 @@ static BOOL linux_kernel_oplock_parse(char *msg_start, int msg_len, SMB_INO_T *i
         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(5,("kernel oplock break request for file dev = %x, inode = %.0f\n", 
+        DEBUG(3,("kernel oplock break request for file dev = %x, inode = %.0f\n", 
 		 (unsigned int)*dev, (double)*inode));
 
 	return True;
@@ -283,6 +292,8 @@ struct kernel_oplocks *linux_init_kernel_oplocks(void)
 	koplocks.msg_waiting = linux_oplock_msg_waiting;
 	koplocks.notification_fd = -1;
 
+	DEBUG(3,("Linux kernel oplocks enabled\n"));
+
 	return &koplocks;
 }