On Mon, Feb 01, 2016 at 10:56:27AM -0800, Nikhilesh Reddy wrote:
> diff --git a/fs/fuse/passthrough.c b/fs/fuse/passthrough.c
[...]
> +static ssize_t fuse_passthrough_read_write_iter(struct kiocb *iocb,
> + struct iov_iter *iter, int do_write)
> +{
> + ssize_t ret_val;
> + struct fuse_file *ff;
> + struct file *fuse_file, *passthrough_filp;
> + struct inode *fuse_inode, *passthrough_inode;
> +
> + ff = iocb->ki_filp->private_data;
> + fuse_file = iocb->ki_filp;
> + passthrough_filp = ff->passthrough_filp;
> +
> + /* lock passthrough file to prevent it from being released */
> + get_file(passthrough_filp);
> + iocb->ki_filp = passthrough_filp;
> + fuse_inode = fuse_file->f_path.dentry->d_inode;
> + passthrough_inode = file_inode(passthrough_filp);
> +
> + if (do_write) {
> + if (!passthrough_filp->f_op->write_iter)
> + return -EIO;
> + ret_val = passthrough_filp->f_op->write_iter(iocb, iter);
> +
> + if (ret_val >= 0 || ret_val == -EIOCBQUEUED) {
> + fsstack_copy_inode_size(fuse_inode, passthrough_inode);
> + fsstack_copy_attr_times(fuse_inode, passthrough_inode);
> + }
> + } else {
> + if (!passthrough_filp->f_op->read_iter)
> + return -EIO;
> + ret_val = passthrough_filp->f_op->read_iter(iocb, iter);
> + if (ret_val >= 0 || ret_val == -EIOCBQUEUED)
> + fsstack_copy_attr_atime(fuse_inode, passthrough_inode);
> + }
> +
> + iocb->ki_filp = fuse_file;
> +
> + /* unlock passthrough file */
> + fput(passthrough_filp);Why the get_file() and fput() in this method? This doesn't look right. There is no lock you're releasing between get_file() and fput(). What are they intended for?
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