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Commit 19c73586 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Al Viro
Browse files

fs: remove __do_readv_writev 



Split it into one helper each for reads vs writes.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 26c87fb7

fs/read_write.c

+36 −24
Original line number Diff line number Diff line
@@ -916,8 +916,8 @@ ssize_t compat_rw_copy_check_uvector(int type, 
}

#endif



static ssize_t __do_readv_writev(int type, struct file *file,

				 struct iov_iter *iter, loff_t *pos, int flags)

static ssize_t do_iter_read(struct file *file, struct iov_iter *iter,

		loff_t *pos, int flags)

{

	size_t tot_len;

	ssize_t ret = 0;
@@ -925,29 +925,41 @@ static ssize_t __do_readv_writev(int type, struct file *file, 
	tot_len = iov_iter_count(iter);

	if (!tot_len)

		goto out;

	ret = rw_verify_area(type, file, pos, tot_len);

	ret = rw_verify_area(READ, file, pos, tot_len);

	if (ret < 0)

		goto out;



	if (type != READ)

		file_start_write(file);

		return ret;



	if ((type == READ && file->f_op->read_iter) ||

	    (type == WRITE && file->f_op->write_iter))

		ret = do_iter_readv_writev(file, iter, pos, type, flags);

	if (file->f_op->read_iter)

		ret = do_iter_readv_writev(file, iter, pos, READ, flags);

	else

		ret = do_loop_readv_writev(file, iter, pos, type, flags);



	if (type != READ)

		file_end_write(file);



		ret = do_loop_readv_writev(file, iter, pos, READ, flags);

out:

	if ((ret + (type == READ)) > 0) {

		if (type == READ)

	if (ret >= 0)

		fsnotify_access(file);

	return ret;

}



static ssize_t do_iter_write(struct file *file, struct iov_iter *iter,

		loff_t *pos, int flags)

{

	size_t tot_len;

	ssize_t ret = 0;



	tot_len = iov_iter_count(iter);

	if (!tot_len)

		return 0;

	ret = rw_verify_area(WRITE, file, pos, tot_len);

	if (ret < 0)

		return ret;



	file_start_write(file);

	if (file->f_op->write_iter)

		ret = do_iter_readv_writev(file, iter, pos, WRITE, flags);

	else

		ret = do_loop_readv_writev(file, iter, pos, WRITE, flags);

	file_end_write(file);

	if (ret > 0)

		fsnotify_modify(file);

	}

	return ret;

}
@@ -968,7 +980,7 @@ ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, 
	if (ret < 0)

		return ret;



	ret = __do_readv_writev(READ, file, &iter, pos, flags);

	ret = do_iter_read(file, &iter, pos, flags);

	kfree(iov);

	return ret;

}
@@ -991,7 +1003,7 @@ ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, 
	if (ret < 0)

		return ret;



	ret = __do_readv_writev(WRITE, file, &iter, pos, flags);

	ret = do_iter_write(file, &iter, pos, flags);

	kfree(iov);

	return ret;

}
@@ -1161,7 +1173,7 @@ static size_t compat_readv(struct file *file, 
	ret = compat_import_iovec(READ, vec, vlen, UIO_FASTIOV, &iov, &iter);

	if (ret < 0)

		goto out;

	ret = __do_readv_writev(READ, file, &iter, pos, flags);

	ret = do_iter_read(file, &iter, pos, flags);

	kfree(iov);

out:

	if (ret > 0)
@@ -1274,7 +1286,7 @@ static size_t compat_writev(struct file *file, 
	ret = compat_import_iovec(WRITE, vec, vlen, UIO_FASTIOV, &iov, &iter);

	if (ret < 0)

		goto out;

	ret = __do_readv_writev(WRITE, file, &iter, pos, flags);

	ret = do_iter_write(file, &iter, pos, flags);

	kfree(iov);

out:

	if (ret > 0)