Commit 09267def authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

init: add an init_umount helper 



Like ksys_umount, but takes a kernel pointer for the destination path.
Switch over the umount in the init code, which just happen to work due to
the implicit set_fs(KERNEL_DS) during early init right now.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent c60166f0

fs/init.c

+14 −0
Original line number Diff line number Diff line
@@ -23,3 +23,17 @@ int __init init_mount(const char *dev_name, const char *dir_name, 
	path_put(&path);

	return ret;

}



int __init init_umount(const char *name, int flags)

{

	int lookup_flags = LOOKUP_MOUNTPOINT;

	struct path path;

	int ret;



	if (!(flags & UMOUNT_NOFOLLOW))

		lookup_flags |= LOOKUP_FOLLOW;

	ret = kern_path(name, lookup_flags, &path);

	if (ret)

		return ret;

	return path_umount(&path, flags);

}

fs/internal.h

+1 −0
Original line number Diff line number Diff line
@@ -92,6 +92,7 @@ extern void dissolve_on_fput(struct vfsmount *); 


int path_mount(const char *dev_name, struct path *path,

		const char *type_page, unsigned long flags, void *data_page);

int path_umount(struct path *path, int flags);



/*

 * fs_struct.c

fs/namespace.c

+2 −2
Original line number Diff line number Diff line
@@ -1706,7 +1706,7 @@ static inline bool may_mandlock(void) 
}

#endif



static int path_umount(struct path *path, int flags)

int path_umount(struct path *path, int flags)

{

	struct mount *mnt;

	int retval;
@@ -1736,7 +1736,7 @@ dput_and_out: 
	return retval;

}



int ksys_umount(char __user *name, int flags)

static int ksys_umount(char __user *name, int flags)

{

	int lookup_flags = LOOKUP_MOUNTPOINT;

	struct path path;

include/linux/init_syscalls.h

+1 −0
Original line number Diff line number Diff line
@@ -2,3 +2,4 @@ 


int __init init_mount(const char *dev_name, const char *dir_name,

		const char *type_page, unsigned long flags, void *data_page);

int __init init_umount(const char *name, int flags);

include/linux/syscalls.h

+0 −1
Original line number Diff line number Diff line
@@ -1236,7 +1236,6 @@ asmlinkage long sys_ni_syscall(void); 
 * the ksys_xyzyyz() functions prototyped below.

 */



int ksys_umount(char __user *name, int flags);

int ksys_chroot(const char __user *filename);

ssize_t ksys_write(unsigned int fd, const char __user *buf, size_t count);

int ksys_chdir(const char __user *filename);

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