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Commit 26c87fb7 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Al Viro
Browse files

fs: remove do_compat_readv_writev 



opencode it in both callers to simplify the call stack a bit.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 251b42a1

fs/read_write.c

+16 −26
Original line number Diff line number Diff line
@@ -1142,32 +1142,13 @@ SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec, 
}



#ifdef CONFIG_COMPAT



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

			       const struct compat_iovec __user *uvector,

			       unsigned long nr_segs, loff_t *pos,

			       int flags)

{

	struct iovec iovstack[UIO_FASTIOV];

	struct iovec *iov = iovstack;

	struct iov_iter iter;

	ssize_t ret;



	ret = compat_import_iovec(type, uvector, nr_segs,

				  UIO_FASTIOV, &iov, &iter);

	if (ret < 0)

		return ret;



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

	kfree(iov);



	return ret;

}



static size_t compat_readv(struct file *file,

			   const struct compat_iovec __user *vec,

			   unsigned long vlen, loff_t *pos, int flags)

{

	struct iovec iovstack[UIO_FASTIOV];

	struct iovec *iov = iovstack;

	struct iov_iter iter;

	ssize_t ret = -EBADF;



	if (!(file->f_mode & FMODE_READ))
@@ -1177,8 +1158,11 @@ static size_t compat_readv(struct file *file, 
	if (!(file->f_mode & FMODE_CAN_READ))

		goto out;



	ret = compat_do_readv_writev(READ, file, vec, vlen, pos, flags);



	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);

	kfree(iov);

out:

	if (ret > 0)

		add_rchar(current, ret);
@@ -1275,6 +1259,9 @@ static size_t compat_writev(struct file *file, 
			    const struct compat_iovec __user *vec,

			    unsigned long vlen, loff_t *pos, int flags)

{

	struct iovec iovstack[UIO_FASTIOV];

	struct iovec *iov = iovstack;

	struct iov_iter iter;

	ssize_t ret = -EBADF;



	if (!(file->f_mode & FMODE_WRITE))
@@ -1284,8 +1271,11 @@ static size_t compat_writev(struct file *file, 
	if (!(file->f_mode & FMODE_CAN_WRITE))

		goto out;



	ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos, flags);



	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);

	kfree(iov);

out:

	if (ret > 0)

		add_wchar(current, ret);