vfs_path_lookup(9) [centos man page]

VFS_PATH_LOOKUP(9)						   The Linux VFS						VFS_PATH_LOOKUP(9)

NAME

       vfs_path_lookup - lookup a file path relative to a dentry-vfsmount pair

SYNOPSIS

       int vfs_path_lookup(struct dentry * dentry, struct vfsmount * mnt, const char * name, unsigned int flags, struct path * path);

ARGUMENTS

       dentry
	   pointer to dentry of the base directory

       mnt
	   pointer to vfs mount of the base directory

       name
	   pointer to file name

       flags
	   lookup flags

       path
	   pointer to struct path to fill

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							VFS_PATH_LOOKUP(9)

DEBUGFS_CREATE_U8(9)					      The debugfs filesystem					      DEBUGFS_CREATE_U8(9)

NAME

       debugfs_create_u8 - create a debugfs file that is used to read and write an unsigned 8-bit value

SYNOPSIS

       struct dentry * debugfs_create_u8(const char * name, umode_t mode, struct dentry * parent, u8 * value);

ARGUMENTS

       name
	   a pointer to a string containing the name of the file to create.

       mode
	   the permission that the file should have

       parent
	   a pointer to the parent dentry for this file. This should be a directory dentry if set. If this parameter is NULL, then the file will
	   be created in the root of the debugfs filesystem.

       value
	   a pointer to the variable that the file should read to and write from.

DESCRIPTION

       This function creates a file in debugfs with the given name that contains the value of the variable value. If the mode variable is so set,
       it can be read from, and written to.

       This function will return a pointer to a dentry if it succeeds. This pointer must be passed to the debugfs_remove function when the file is
       to be removed (no automatic cleanup happens if your module is unloaded, you are responsible here.) If an error occurs, NULL will be
       returned.

       If debugfs is not enabled in the kernel, the value -ENODEV will be returned. It is not wise to check for this value, but rather, check for
       NULL or !NULL instead as to eliminate the need for #ifdef in the calling code.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						      DEBUGFS_CREATE_U8(9)