__copy_from_user_ina(9)

NAME

__copy_from_user_inatomic - Copy a block of data from user

space, with less checking.

SYNOPSIS

__always_inline                unsigned               long
__copy_from_user_inatomic(void * to, const void  __user  *  from,
unsigned long n);

ARGUMENTS

to

Destination address, in kernel space.

from

Source address, in user space.

n

Number of bytes to copy.

CONTEXT

User context only. This function may sleep.

DESCRIPTION

Copy data from user space to kernel space. Caller must

check the specified block with access_ok before calling this

function.

Returns number of bytes that could not be copied. On suc

cess, this will be zero.

If some data could not be copied, this function will pad

the copied data to the requested size using zero bytes.

An alternate version - __copy_from_user_inatomic - may be

called from atomic context and will fail rather than sleep. In

this case the uncopied bytes will *NOT* be padded with zeros. See

fs/filemap.h for explanation of why this is needed.

COPYRIGHT

__COPY_FROM_USER_INA(9)