diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2017-04-13 14:13:36 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-04-21 13:57:47 -0400 |
| commit | 5ecda13711b3bd4a750b5740897bf13d1720de7c (patch) | |
| tree | f1a1003f00826cc0924ac8dacd213f472a31fa08 | |
| parent | 639a93a521c759ddb32cc875f3ea1965072b2cbc (diff) | |
generic_file_read_iter(): make use of iov_iter_revert()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | mm/filemap.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 9f788eecd2c5..cc480c07c71b 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2033,7 +2033,6 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) if (iocb->ki_flags & IOCB_DIRECT) { struct address_space *mapping = file->f_mapping; struct inode *inode = mapping->host; - struct iov_iter data = *iter; loff_t size; size = i_size_read(inode); @@ -2044,11 +2043,12 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) file_accessed(file); - retval = mapping->a_ops->direct_IO(iocb, &data); + retval = mapping->a_ops->direct_IO(iocb, iter); if (retval >= 0) { iocb->ki_pos += retval; - iov_iter_advance(iter, retval); + count -= retval; } + iov_iter_revert(iter, iov_iter_count(iter) - count); /* * Btrfs can have a short DIO read if we encounter @@ -2059,7 +2059,7 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) * the rest of the read. Buffered reads will not work for * DAX files, so don't bother trying. */ - if (retval < 0 || !iov_iter_count(iter) || iocb->ki_pos >= size || + if (retval < 0 || !count || iocb->ki_pos >= size || IS_DAX(inode)) goto out; } |