Merge tag 'vfs-6.10.rw' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs rw iterator updates from Christian Brauner:
 "The core fs signalfd, userfaultfd, and timerfd subsystems did still
  use f_op->read() instead of f_op->read_iter(). Convert them over since
  we should aim to get rid of f_op->read() at some point.

  Aside from that io_uring and others want to mark files as FMODE_NOWAIT
  so it can make use of per-IO nonblocking hints to enable more
  efficient IO. Converting those users to f_op->read_iter() allows them
  to be marked with FMODE_NOWAIT"

* tag 'vfs-6.10.rw' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  signalfd: convert to ->read_iter()
  userfaultfd: convert to ->read_iter()
  timerfd: convert to ->read_iter()
  new helper: copy_to_iter_full()

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/uio.h b/include/linux/uio.h
index 00cebe2b70de..7020adedfa08 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -206,6 +206,16 @@ size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i)
 }
 
 static __always_inline __must_check
+bool copy_to_iter_full(const void *addr, size_t bytes, struct iov_iter *i)
+{
+	size_t copied = copy_to_iter(addr, bytes, i);
+	if (likely(copied == bytes))
+		return true;
+	iov_iter_revert(i, copied);
+	return false;
+}
+
+static __always_inline __must_check
 bool copy_from_iter_full(void *addr, size_t bytes, struct iov_iter *i)
 {
 	size_t copied = copy_from_iter(addr, bytes, i);