[git pull] sendfile fixes

[Al Viro]

	Making sendfile() to pipe destination do the right thing, should
make "fs/pipe: allow sendfile() to pipe again" redundant.  Sat in -next
for 3 weeks...

The following changes since commit 5c8fe583cce542aa0b84adc939ce85293de36e5e:

  Linux 5.11-rc1 (2020-12-27 15:30:22 -0800)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git work.sendfile

for you to fetch changes up to b964bf53e540262f2d12672b3cca10842c0172e7:

  teach sendfile(2) to handle send-to-pipe directly (2021-01-25 23:29:36 -0500)

----------------------------------------------------------------
Al Viro (3):
      do_splice_to(): move the logics for limiting the read length in
      take the guts of file-to-pipe splice into a helper function
      teach sendfile(2) to handle send-to-pipe directly

 fs/internal.h   |  9 +++++++++
 fs/read_write.c | 19 +++++++++++++------
 fs/splice.c     | 44 ++++++++++++++++++++++++--------------------
 3 files changed, 46 insertions(+), 26 deletions(-)