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iov_iter: Turn iov_iter_fault_in_readable into fault_in_iov_iter_readable

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commit a6294593e8a1290091d0b078d5d33da5e0cd3dfe upstream

Turn iov_iter_fault_in_readable into a function that returns the number
of bytes not faulted in, similar to copy_to_user, instead of returning a
non-zero value when any of the requested pages couldn't be faulted in.
This supports the existing users that require all pages to be faulted in
as well as new users that are happy if any pages can be faulted in.

Rename iov_iter_fault_in_readable to fault_in_iov_iter_readable to make
sure this change doesn't silently break things.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andreas Gruenbacher
2022-04-15 06:28:40 +08:00
committed by Greg Kroah-Hartman
parent 923f05a660
commit 30e66b1dfc
9 changed files with 30 additions and 21 deletions
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2
mm/filemap.c
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@@ -3760,7 +3760,7 @@ again:
* same page as we're writing to, without it being marked
* up-to-date.
*/
if (unlikely(iov_iter_fault_in_readable(i, bytes))) {
if (unlikely(fault_in_iov_iter_readable(i, bytes))) {
status = -EFAULT;
break;
}