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Make linux(4) create /dev/shm. Linux applications often expect

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a tmpfs to be mounted there, and because they like to verify it's
actually a mountpoint, a symlink won't do.

Reviewed by:	dchagin (earlier version)
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D20333
This commit is contained in:
Edward Tomasz Napierala 2019-11-06 20:53:33 +00:00
parent fcb71d3f8e
commit 044ab55e41
4 changed files with 34 additions and 0 deletions
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27
sys/compat/linux/linux.c
View File

@ -31,6 +31,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/ctype.h>
#include <sys/jail.h>
#include <sys/lock.h>
@ -129,6 +130,12 @@ static int linux_to_bsd_sigtbl[LINUX_SIGTBLSZ] = {
SIGSYS /* LINUX_SIGSYS */
};
static struct cdev *dev_shm_cdev;
static struct cdevsw dev_shm_cdevsw = {
.d_version = D_VERSION,
.d_name = "dev_shm",
};
/*
* Map Linux RT signals to the FreeBSD RT signals.
*/
@ -524,3 +531,23 @@ linux_to_bsd_sockaddr(const struct l_sockaddr *osa, struct sockaddr **sap,
free(kosa, M_SONAME);
return (error);
}
void
linux_dev_shm_create(void)
{
int error;
error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev_shm_cdev,
&dev_shm_cdevsw, NULL, UID_ROOT, GID_WHEEL, 0, "shm/.mountpoint");
if (error != 0) {
printf("%s: failed to create device node, error %d\n",
__func__, error);
}
}
void
linux_dev_shm_destroy(void)
{
destroy_dev(dev_shm_cdev);
}

3
sys/compat/linux/linux.h
View File

@ -143,4 +143,7 @@ int bsd_to_linux_signal(int sig);
extern LIST_HEAD(futex_list, futex) futex_list;
extern struct mtx futex_mtx;
void linux_dev_shm_create(void);
void linux_dev_shm_destroy(void);
#endif /* _LINUX_MI_H_ */

2
sys/compat/linux/linux_common.c
View File

@ -68,6 +68,7 @@ linux_common_modevent(module_t mod, int type, void *data)
switch(type) {
case MOD_LOAD:
linux_dev_shm_create();
linux_osd_jail_register();
linux_exit_tag = EVENTHANDLER_REGISTER(process_exit,
linux_proc_exit, NULL, 1000);
@ -81,6 +82,7 @@ linux_common_modevent(module_t mod, int type, void *data)
mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF);
break;
case MOD_UNLOAD:
linux_dev_shm_destroy();
linux_osd_jail_deregister();
SET_FOREACH(ldhp, linux_device_handler_set)
linux_device_unregister_handler(*ldhp);

2
sys/i386/linux/linux_sysvec.c
View File

@ -1006,6 +1006,7 @@ linux_elf_modevent(module_t mod, int type, void *data)
linux_get_machine(&linux_kplatform);
linux_szplatform = roundup(strlen(linux_kplatform) + 1,
sizeof(char *));
linux_dev_shm_create();
linux_osd_jail_register();
stclohz = (stathz ? stathz : hz);
if (bootverbose)
@ -1031,6 +1032,7 @@ linux_elf_modevent(module_t mod, int type, void *data)
EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag);
EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag);
EVENTHANDLER_DEREGISTER(thread_dtor, linux_thread_dtor_tag);
linux_dev_shm_destroy();
linux_osd_jail_deregister();
if (bootverbose)
printf("Linux ELF exec handler removed\n");