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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-10-10 13:26:27 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-10-10 13:36:06 -0400 |
| commit | c3a690240423fc4eb8a0c3c7df025d13eadf140b (patch) | |
| tree | 20f4a32910427c2aa4ccf8e33633d6e7194628bf /mm/filemap.c | |
| parent | a949e63992469fed87aef197347960ced31701b8 (diff) | |
| download | lwn-c3a690240423fc4eb8a0c3c7df025d13eadf140b.tar.gz lwn-c3a690240423fc4eb8a0c3c7df025d13eadf140b.zip | |
fix ITER_PIPE interaction with direct_IO
by making sure we call iov_iter_advance() on original
iov_iter even if direct_IO (done on its copy) has returned 0.
It's a no-op for old iov_iter flavours and does the right thing
(== truncation of the stuff we'd allocated, but not filled) in
ITER_PIPE case. Failures (e.g. -EIO) get caught and dealt with
by cleanup in generic_file_read_iter().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 8a287dfc5372..6b965efe215e 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1920,7 +1920,7 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) retval = mapping->a_ops->direct_IO(iocb, &data); } - if (retval > 0) { + if (retval >= 0) { iocb->ki_pos += retval; iov_iter_advance(iter, retval); } |