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Commit edab5fe3 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Al Viro
Browse files

fs: move more code into do_iter_read/do_iter_write 



The checks for the permissions and can read / write flags are common
for the callers.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 19c73586

fs/read_write.c

+28 −45
Original line number Diff line number Diff line
@@ -922,6 +922,11 @@ static ssize_t do_iter_read(struct file *file, struct iov_iter *iter, 
	size_t tot_len;

	ssize_t ret = 0;



	if (!(file->f_mode & FMODE_READ))

		return -EBADF;

	if (!(file->f_mode & FMODE_CAN_READ))

		return -EINVAL;



	tot_len = iov_iter_count(iter);

	if (!tot_len)

		goto out;
@@ -945,6 +950,11 @@ static ssize_t do_iter_write(struct file *file, struct iov_iter *iter, 
	size_t tot_len;

	ssize_t ret = 0;



	if (!(file->f_mode & FMODE_WRITE))

		return -EBADF;

	if (!(file->f_mode & FMODE_CAN_WRITE))

		return -EINVAL;



	tot_len = iov_iter_count(iter);

	if (!tot_len)

		return 0;
@@ -971,17 +981,12 @@ ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, 
	struct iov_iter iter;

	ssize_t ret;



	if (!(file->f_mode & FMODE_READ))

		return -EBADF;

	if (!(file->f_mode & FMODE_CAN_READ))

		return -EINVAL;



	ret = import_iovec(READ, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);

	if (ret < 0)

		return ret;



	if (ret >= 0) {

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

		kfree(iov);

	}



	return ret;

}

EXPORT_SYMBOL(vfs_readv);
@@ -994,17 +999,11 @@ ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, 
	struct iov_iter iter;

	ssize_t ret;



	if (!(file->f_mode & FMODE_WRITE))

		return -EBADF;

	if (!(file->f_mode & FMODE_CAN_WRITE))

		return -EINVAL;



	ret = import_iovec(WRITE, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);

	if (ret < 0)

		return ret;



	if (ret >= 0) {

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

		kfree(iov);

	}

	return ret;

}

EXPORT_SYMBOL(vfs_writev);
@@ -1161,21 +1160,13 @@ static size_t compat_readv(struct file *file, 
	struct iovec iovstack[UIO_FASTIOV];

	struct iovec *iov = iovstack;

	struct iov_iter iter;

	ssize_t ret = -EBADF;



	if (!(file->f_mode & FMODE_READ))

		goto out;



	ret = -EINVAL;

	if (!(file->f_mode & FMODE_CAN_READ))

		goto out;

	ssize_t ret;



	ret = compat_import_iovec(READ, vec, vlen, UIO_FASTIOV, &iov, &iter);

	if (ret < 0)

		goto out;

	if (ret >= 0) {

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

		kfree(iov);

out:

	}

	if (ret > 0)

		add_rchar(current, ret);

	inc_syscr(current);
@@ -1274,21 +1265,13 @@ static size_t compat_writev(struct file *file, 
	struct iovec iovstack[UIO_FASTIOV];

	struct iovec *iov = iovstack;

	struct iov_iter iter;

	ssize_t ret = -EBADF;



	if (!(file->f_mode & FMODE_WRITE))

		goto out;



	ret = -EINVAL;

	if (!(file->f_mode & FMODE_CAN_WRITE))

		goto out;

	ssize_t ret;



	ret = compat_import_iovec(WRITE, vec, vlen, UIO_FASTIOV, &iov, &iter);

	if (ret < 0)

		goto out;

	if (ret >= 0) {

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

		kfree(iov);

out:

	}

	if (ret > 0)

		add_wchar(current, ret);

	inc_syscw(current);