Re: [RFC PATCH 1/2] fs: Add dirreadahead syscall and VFS hooks

On Tue, Jul 29, 2014 at 10:21:50AM +0200, Michael Kerrisk wrote:

[CC+=linux-api]

On Fri, Jul 25, 2014 at 7:37 PM, Abhi Das [off-list ref] wrote:

quoted

Also adds a void *opaque field to struct dir_context that can be
used by filesystems to temporarily store any context as this
struct gets passed around in the fs.

So the prototype is:

int dir_readahead(int fd, off64_t offset, unsigned int count);

Why do we need a new syscall for this?

$ man 2 readahead
....
ssize_t readahead(int fd, off64_t offset, size_t count);
....
	EINVAL fd does not refer to a file type to which readahead() can be applied.


Cheers,

Dave.
-- 
Dave Chinner
david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org