Enhance the Linux emulation layer to make MegaRAID SAS managements tool happy.

Add back in a scheme to emulate old type major/minor numbers via hooks into
stat, linprocfs to return major/minors that Linux app's expect.  Currently
only /dev/null is always registered.  Drivers can register via the Linux
type shim similar to the ioctl shim but by using
linux_device_register_handler/linux_device_unregister_handler functions.
The structure is:

    struct linux_device_handler {
        char    *bsd_driver_name;
        char    *linux_driver_name;
        char    *bsd_device_name;
        char    *linux_device_name;
        int     linux_major;
        int     linux_minor;
        int     linux_char_device;
    };

Linprocfs uses this to display the major number of the driver.  The
soon to be available linsysfs will use it to fill in the driver name.
Linux_stat uses it to translate the major/minor into Linux type values.

Note major numbers are dynamically assigned via passing in a -1 for
the major number so we don't need to keep track of them.

This is somewhat needed due to us switching to our devfs.  MegaCli
will not run until I add in the linsysfs and mfi Linux compat changes.

Sponsored by:	IronPort Systems

1 files changed, 6 insertions, 0 deletions

diff --git a/sys/i386/linux/linux_sysvec.c b/sys/i386/linux/linux_sysvec.c
index 0333acb..40e6e48 100644
--- a/sys/i386/linux/linux_sysvec.c
+++ b/sys/i386/linux/linux_sysvec.c
@@ -93,6 +93,7 @@ extern int linux_szsigcode;
 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
 
 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
+SET_DECLARE(linux_device_handler_set, struct linux_device_handler);
 
 static int	linux_fixup(register_t **stack_base,
 		    struct image_params *iparams);
@@ -887,6 +888,7 @@ linux_elf_modevent(module_t mod, int type, void *data)
 	Elf32_Brandinfo **brandinfo;
 	int error;
 	struct linux_ioctl_handler **lihp;
+	struct linux_device_handler **ldhp;
 
 	error = 0;
 
@@ -899,6 +901,8 @@ linux_elf_modevent(module_t mod, int type, void *data)
 		if (error == 0) {
 			SET_FOREACH(lihp, linux_ioctl_handler_set)
 				linux_ioctl_register_handler(*lihp);
+			SET_FOREACH(ldhp, linux_device_handler_set)
+				linux_device_register_handler(*ldhp);
 			if (bootverbose)
 				printf("Linux ELF exec handler installed\n");
 		} else
@@ -918,6 +922,8 @@ linux_elf_modevent(module_t mod, int type, void *data)
 		if (error == 0) {
 			SET_FOREACH(lihp, linux_ioctl_handler_set)
 				linux_ioctl_unregister_handler(*lihp);
+			SET_FOREACH(ldhp, linux_device_handler_set)
+				linux_device_unregister_handler(*ldhp);
 			if (bootverbose)
 				printf("Linux ELF exec handler removed\n");
 		} else