tree 4794c8e5b7c7aec176f695dfc9d723d4a73e3ba9
parent f21121cde6e617b90cd03ce083652ca543004dc2
author Changli Gao <xiaosuo@gmail.com> 1257322192 +0100
committer Jens Axboe <jens.axboe@oracle.com> 1257322192 +0100

sendfile(): check f_op.splice_write() rather than f_op.sendpage()

sendfile(2) was reworked with the splice infrastructure, but it still
checks f_op.sendpage() instead of f_op.splice_write() wrongly.  Although
if f_op.sendpage() exists, f_op.splice_write() always exists at the same
time currently, the assumption will be broken in future silently.  This
patch also brings a side effect: sendfile(2) can work with any output
file.  Some security checks related to f_op are added too.

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>