diff options
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index c5808b7a5fb1..dc59c5f35b37 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2035,7 +2035,6 @@ 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); @@ -2046,11 +2045,12 @@ 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 @@ -2061,7 +2061,7 @@ 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; } @@ -2706,7 +2706,6 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from) ssize_t written; size_t write_len; pgoff_t end; - struct iov_iter data; write_len = iov_iter_count(from); end = (pos + write_len - 1) >> PAGE_SHIFT; @@ -2735,8 +2734,7 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from) } } - data = *from; - written = mapping->a_ops->direct_IO(iocb, &data); + written = mapping->a_ops->direct_IO(iocb, from); /* * Finally, try again to invalidate clean pages which might have been @@ -2753,13 +2751,14 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from) if (written > 0) { pos += written; - iov_iter_advance(from, written); + write_len -= written; if (pos > i_size_read(inode) && !S_ISBLK(inode->i_mode)) { i_size_write(inode, pos); mark_inode_dirty(inode); } iocb->ki_pos = pos; } + iov_iter_revert(from, write_len - iov_iter_count(from)); out: return written; } |