Differential D1072 Diff 2323 sys/compat/linux/linux_util.c

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sys/compat/linux/linux_util.c

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#include <sys/sdt.h>		#include <sys/sdt.h>
#include <sys/syscallsubr.h>		#include <sys/syscallsubr.h>
#include <sys/systm.h>		#include <sys/systm.h>
#include <sys/vnode.h>		#include <sys/vnode.h>

#include <machine/stdarg.h>		#include <machine/stdarg.h>

#include <compat/linux/linux_util.h>		#include <compat/linux/linux_util.h>
#ifdef COMPAT_LINUX32
#include <machine/../linux32/linux.h>
#else
#include <machine/../linux/linux.h>
#endif

#include <compat/linux/linux_dtrace.h>		MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");

const char linux_emul_path[] = "/compat/linux";		const char linux_emul_path[] = "/compat/linux";

/* DTrace init */
LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);

/**
* DTrace probes in this module.
*/
LIN_SDT_PROBE_DEFINE5(util, linux_emul_convpath, entry, "const char *",
"enum uio_seg", "char **", "int", "int");
LIN_SDT_PROBE_DEFINE1(util, linux_emul_convpath, return, "int");
LIN_SDT_PROBE_DEFINE1(util, linux_msg, entry, "const char *");
LIN_SDT_PROBE_DEFINE0(util, linux_msg, return);
LIN_SDT_PROBE_DEFINE2(util, linux_driver_get_name_dev, entry, "device_t",
"const char *");
LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_name_dev, nullcall);
LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_name_dev, return, "char *");
LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, entry, "char *",
"int ", "int ");
LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_major_minor, nullcall);
LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_major_minor, notfound, "char *");
LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, return, "int",
"int", "int");
LIN_SDT_PROBE_DEFINE0(util, linux_get_char_devices, entry);
LIN_SDT_PROBE_DEFINE1(util, linux_get_char_devices, return, "char *");
LIN_SDT_PROBE_DEFINE1(util, linux_free_get_char_devices, entry, "char *");
LIN_SDT_PROBE_DEFINE0(util, linux_free_get_char_devices, return);
LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, entry,
"struct linux_device_handler *");
LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, return, "int");
LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, entry,
"struct linux_device_handler *");
LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, return, "int");

/*		/*
* Search an alternate path before passing pathname arguments on to		* Search an alternate path before passing pathname arguments on to
* system calls. Useful for keeping a separate 'emulation tree'.		* system calls. Useful for keeping a separate 'emulation tree'.
*		*
* If cflag is set, we check if an attempt can be made to create the		* If cflag is set, we check if an attempt can be made to create the
* named file, i.e. we check if the directory it should be in exists.		* named file, i.e. we check if the directory it should be in exists.
*/		*/
int		int
linux_emul_convpath(struct thread td, const char path, enum uio_seg pathseg,		linux_emul_convpath(struct thread td, const char path, enum uio_seg pathseg,
char **pbuf, int cflag, int dfd)		char **pbuf, int cflag, int dfd)
{		{
int retval;		int retval;

LIN_SDT_PROBE5(util, linux_emul_convpath, entry, path, pathseg, pbuf,
cflag, dfd);

retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,		retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
cflag, dfd);		cflag, dfd);

LIN_SDT_PROBE1(util, linux_emul_convpath, return, retval);
return (retval);		return (retval);
}		}

void		void
linux_msg(const struct thread td, const char fmt, ...)		linux_msg(const struct thread td, const char fmt, ...)
{		{
va_list ap;		va_list ap;
struct proc *p;		struct proc *p;

LIN_SDT_PROBE1(util, linux_msg, entry, fmt);

p = td->td_proc;		p = td->td_proc;
printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);		printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
va_start(ap, fmt);		va_start(ap, fmt);
vprintf(fmt, ap);		vprintf(fmt, ap);
va_end(ap);		va_end(ap);
printf("\n");		printf("\n");

LIN_SDT_PROBE0(util, linux_msg, return);
}		}

struct device_element		struct device_element
{		{
TAILQ_ENTRY(device_element) list;		TAILQ_ENTRY(device_element) list;
struct linux_device_handler entry;		struct linux_device_handler entry;
};		};

static TAILQ_HEAD(, device_element) devices =		static TAILQ_HEAD(, device_element) devices =
TAILQ_HEAD_INITIALIZER(devices);		TAILQ_HEAD_INITIALIZER(devices);

static struct linux_device_handler null_handler =		static struct linux_device_handler null_handler =
{ "mem", "mem", "null", "null", 1, 3, 1};		{ "mem", "mem", "null", "null", 1, 3, 1};

DATA_SET(linux_device_handler_set, null_handler);		DATA_SET(linux_device_handler_set, null_handler);

char *		char *
linux_driver_get_name_dev(device_t dev)		linux_driver_get_name_dev(device_t dev)
{		{
struct device_element *de;		struct device_element *de;
const char *device_name = device_get_name(dev);		const char *device_name = device_get_name(dev);

LIN_SDT_PROBE2(util, linux_driver_get_name_dev, entry, dev,		if (device_name == NULL)
device_name);

if (device_name == NULL) {
LIN_SDT_PROBE0(util, linux_driver_get_name_dev, nullcall);
LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return, NULL);
return NULL;		return NULL;
}
TAILQ_FOREACH(de, &devices, list) {		TAILQ_FOREACH(de, &devices, list) {
if (strcmp(device_name, de->entry.bsd_driver_name) == 0) {		if (strcmp(device_name, de->entry.bsd_driver_name) == 0)
LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return,
de->entry.linux_driver_name);
return (de->entry.linux_driver_name);		return (de->entry.linux_driver_name);
}		}
}

LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return, NULL);		return (NULL);
return NULL;
}		}

int		int
linux_driver_get_major_minor(const char node, int major, int *minor)		linux_driver_get_major_minor(const char node, int major, int *minor)
{		{
struct device_element *de;		struct device_element *de;

LIN_SDT_PROBE3(util, linux_driver_get_major_minor, entry, node, major,		if (node == NULL \|\| major == NULL \|\| minor == NULL)
minor);

if (node == NULL \|\| major == NULL \|\| minor == NULL) {
LIN_SDT_PROBE0(util, linux_driver_get_major_minor, nullcall);
LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 1,
0, 0);
return 1;		return 1;
}

if (strlen(node) > strlen("pts/") &&		if (strlen(node) > strlen("pts/") &&
strncmp(node, "pts/", strlen("pts/")) == 0) {		strncmp(node, "pts/", strlen("pts/")) == 0) {
unsigned long devno;		unsigned long devno;

/*		/*
* Linux checks major and minors of the slave device		* Linux checks major and minors of the slave device
* to make sure it's a pty device, so let's make him		* to make sure it's a pty device, so let's make him
* believe it is.		* believe it is.
*/		*/
devno = strtoul(node + strlen("pts/"), NULL, 10);		devno = strtoul(node + strlen("pts/"), NULL, 10);
*major = 136 + (devno / 256);		*major = 136 + (devno / 256);
*minor = devno % 256;		*minor = devno % 256;

LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 0,		return (0);
major, minor);
return 0;
}		}

TAILQ_FOREACH(de, &devices, list) {		TAILQ_FOREACH(de, &devices, list) {
if (strcmp(node, de->entry.bsd_device_name) == 0) {		if (strcmp(node, de->entry.bsd_device_name) == 0) {
*major = de->entry.linux_major;		*major = de->entry.linux_major;
*minor = de->entry.linux_minor;		*minor = de->entry.linux_minor;
		return (0);
LIN_SDT_PROBE3(util, linux_driver_get_major_minor,
return, 0, major, minor);
return 0;
}		}
}		}

LIN_SDT_PROBE1(util, linux_driver_get_major_minor, notfound, node);		return (1);
LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 1, 0, 0);
return 1;
}		}

char *		char *
linux_get_char_devices()		linux_get_char_devices()
{		{
struct device_element *de;		struct device_element *de;
char temp, string, *last;		char temp, string, *last;
char formated[256];		char formated[256];
int current_size = 0, string_size = 1024;		int current_size = 0, string_size = 1024;

LIN_SDT_PROBE0(util, linux_get_char_devices, entry);

string = malloc(string_size, M_LINUX, M_WAITOK);		string = malloc(string_size, M_LINUX, M_WAITOK);
string[0] = '\000';		string[0] = '\000';
last = "";		last = "";
TAILQ_FOREACH(de, &devices, list) {		TAILQ_FOREACH(de, &devices, list) {
if (!de->entry.linux_char_device)		if (!de->entry.linux_char_device)
continue;		continue;
temp = string;		temp = string;
if (strcmp(last, de->entry.bsd_driver_name) != 0) {		if (strcmp(last, de->entry.bsd_driver_name) != 0) {
Show All 10 Lines	if (strcmp(last, de->entry.bsd_driver_name) != 0) {
bcopy(temp, string, current_size);		bcopy(temp, string, current_size);
free(temp, M_LINUX);		free(temp, M_LINUX);
}		}
strcat(string, formated);		strcat(string, formated);
current_size = strlen(string);		current_size = strlen(string);
}		}
}		}

LIN_SDT_PROBE1(util, linux_get_char_devices, return, string);		return (string);
return string;
}		}

void		void
linux_free_get_char_devices(char *string)		linux_free_get_char_devices(char *string)
{		{

LIN_SDT_PROBE1(util, linux_get_char_devices, entry, string);

free(string, M_LINUX);		free(string, M_LINUX);

LIN_SDT_PROBE0(util, linux_get_char_devices, return);
}		}

static int linux_major_starting = 200;		static int linux_major_starting = 200;

int		int
linux_device_register_handler(struct linux_device_handler *d)		linux_device_register_handler(struct linux_device_handler *d)
{		{
struct device_element *de;		struct device_element *de;

LIN_SDT_PROBE1(util, linux_device_register_handler, entry, d);		if (d == NULL)

if (d == NULL) {
LIN_SDT_PROBE1(util, linux_device_register_handler, return,
EINVAL);
return (EINVAL);		return (EINVAL);
}

de = malloc(sizeof(*de), M_LINUX, M_WAITOK);		de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
if (d->linux_major < 0) {		if (d->linux_major < 0) {
d->linux_major = linux_major_starting++;		d->linux_major = linux_major_starting++;
}		}
bcopy(d, &de->entry, sizeof(*d));		bcopy(d, &de->entry, sizeof(*d));

/* Add the element to the list, sorted on span. */		/* Add the element to the list, sorted on span. */
TAILQ_INSERT_TAIL(&devices, de, list);		TAILQ_INSERT_TAIL(&devices, de, list);

LIN_SDT_PROBE1(util, linux_device_register_handler, return, 0);
return (0);		return (0);
}		}

int		int
linux_device_unregister_handler(struct linux_device_handler *d)		linux_device_unregister_handler(struct linux_device_handler *d)
{		{
struct device_element *de;		struct device_element *de;

LIN_SDT_PROBE1(util, linux_device_unregister_handler, entry, d);		if (d == NULL)

if (d == NULL) {
LIN_SDT_PROBE1(util, linux_device_unregister_handler, return,
EINVAL);
return (EINVAL);		return (EINVAL);
}

TAILQ_FOREACH(de, &devices, list) {		TAILQ_FOREACH(de, &devices, list) {
if (bcmp(d, &de->entry, sizeof(*d)) == 0) {		if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
TAILQ_REMOVE(&devices, de, list);		TAILQ_REMOVE(&devices, de, list);
free(de, M_LINUX);		free(de, M_LINUX);

LIN_SDT_PROBE1(util, linux_device_unregister_handler,
return, 0);
return (0);		return (0);
}		}
}		}

LIN_SDT_PROBE1(util, linux_device_unregister_handler, return, EINVAL);
return (EINVAL);		return (EINVAL);
}		}