Re: [PATCH v2 4/7] iov_iter: new iov_iter_pin_pages*() routines

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, Aug 30, 2022 at 09:18:40PM -0700, John Hubbard wrote:
> Provide two new wrapper routines that are intended for user space pages
> only:
> 
>     iov_iter_pin_pages()
>     iov_iter_pin_pages_alloc()
> 
> Internally, these routines call pin_user_pages_fast(), instead of
> get_user_pages_fast(), for user_backed_iter(i) and iov_iter_bvec(i)
> cases.
> 
> As always, callers must use unpin_user_pages() or a suitable FOLL_PIN
> variant, to release the pages, if they actually were acquired via
> pin_user_pages_fast().
> 
> This is a prerequisite to converting bio/block layers over to use
> pin_user_pages_fast().

What of ITER_PIPE (splice from O_DIRECT fd to a to pipe, for filesystem
that uses generic_file_splice_read())?



[Index of Archives]     [Linux RAID]     [Linux SCSI]     [Linux ATA RAID]     [IDE]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Device Mapper]

  Powered by Linux