how to use mmap() on a disk file to get a kernel address?
lazysmartegg at gmail.com
Mon Dec 30 21:35:49 EST 2013
Thanks for your idea.
Because I implement a kernel storage service based on a disk file
through VFS layer.
To simplify the implementation, I prefer to read/write the mapped
kernel space address instead of the file data access api(such as page cache
API / VFS API).
In FreeBSD, I can use vm_map_find to map a file into kernel space
address( vnode pager)
But in linux, I don't know how to implement this(map disk file into
On Thu, Dec 26, 2013 at 3:42 PM, Yu Bi <lazysmartegg at gmail.com> wrote:
> I try to mmap a file in a linux kernel module. I have tried to use the
> function do_mmap_pgoff. But the address returned is memory virtual
> address in current process' user space, i.e., below the kernel boundary.
> Instead, I want to map the file in the kernel space and get the kernel
> virtual address of the mapped region. Is there any kernel API in Linux
> support this operation? Or I have to reimplement a kernel mmap version ?
> But reimplement a kernel version mmap() is not easy I guess. Do you
> have any idea?
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