lttle guest manager device

fs/namei.c

@@ -40,6 +40,7 @@
 #include <linux/bitops.h>
 #include <linux/init_task.h>
 #include <linux/uaccess.h>
+#include <lttle/trigger.h>
 
 #include "internal.h"
 #include "mount.h"
@@ -4928,6 +4929,10 @@ int do_renameat2(int olddfd, struct filename *from, int newdfd,
 	rd.delegated_inode = &delegated_inode;
 	rd.flags	   = flags;
 	error = vfs_rename(&rd);
+	if (!error) {
+		struct path rpath = { .dentry = old_dentry, .mnt = new_path.mnt };
+		lttle_check_rename(&rpath);
+	}
 exit5:
 	dput(new_dentry);
 exit4:

fs/open.c

@@ -33,6 +33,7 @@
 #include <linux/dnotify.h>
 #include <linux/compat.h>
 #include <linux/mnt_idmapping.h>
+#include <lttle/trigger.h>
 
 #include "internal.h"
 
@@ -1423,6 +1424,7 @@ int filp_close(struct file *filp, fl_owner_t id)
 		dnotify_flush(filp, id);
 		locks_remove_posix(filp, id);
 	}
+	lttle_check_close(filp);
 	fput(filp);
 	return retval;
 }

include/lttle/trigger.h

@@ -0,0 +1,46 @@
+#ifndef _LTTLE_TRIGGER_H
+#define _LTTLE_TRIGGER_H
+
+#include <linux/io.h>
+#include <linux/ioctl.h>
+
+struct file;
+struct path;
+
+struct lttle_watch_req {
+	__u32 index;
+	char path[256];
+};
+
+#define LTTLE_IOC_MAGIC 'L'
+#define LTTLE_IOC_WATCH _IOW(LTTLE_IOC_MAGIC, 1, struct lttle_watch_req)
+
+/* Triggers are sent via PIO port 0x510 (8-byte outl pairs).
+ * No MMIO mapping needed. */
+#define LTTLE_TRIGGER_PIO_PORT (0x510)
+
+#define LTTLE_SYS_AFTER_OFFSET 127
+#define LTTLE_SYS_CMD_OFFSET 64
+
+#define LTTLE_SYS_LISTEN_BEFORE 1
+#define LTTLE_SYS_BIND_BEFORE 2
+#define LTTLE_USERSPACE_READY 3
+#define LTTLE_MANUAL_TRIGGER 10
+
+#define LTTLE_SYS_LISTEN_AFTER (LTTLE_SYS_LISTEN_BEFORE + LTTLE_SYS_AFTER_OFFSET)
+#define LTTLE_SYS_BIND_AFTER (LTTLE_SYS_BIND_BEFORE + LTTLE_SYS_AFTER_OFFSET)
+
+#define LTTLE_CMD_FLASH_LOCK (LTTLE_SYS_CMD_OFFSET + 0)
+#define LTTLE_CMD_FLASH_UNLOCK (LTTLE_SYS_CMD_OFFSET + 1)
+
+#define LTTLE_FILE_WATCH_MAX 2
+
+int __init lttle_subsystem_init(void);
+void __exit lttle_subsystem_exit(void);
+void lttle_sys_trigger(unsigned char code, char data[7]);
+void lttle_sys_cmd(unsigned char cmd);
+void lttle_set_watch(int index, const char *path);
+void lttle_check_close(struct file *file);
+void lttle_check_rename(const struct path *path);
+
+#endif // _LTTLE_TRIGGER_H

kernel/Makefile

@@ -10,7 +10,8 @@ obj-y     = fork.o exec_domain.o panic.o \
 	    extable.o params.o \
 	    kthread.o sys_ni.o nsproxy.o \
 	    notifier.o ksysfs.o cred.o reboot.o \
-	    async.o range.o smpboot.o ucount.o regset.o
+	    async.o range.o smpboot.o ucount.o regset.o \
+		lttle.o
 
 obj-$(CONFIG_USERMODE_DRIVER) += usermode_driver.o
 obj-$(CONFIG_MODULES) += kmod.o