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fs: remove do_compat_readv_writev

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

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2017-05-27 11:16:47 +03:00 committed by Al Viro
parent 251b42a1dc
commit 26c87fb7d1
1 changed files with 16 additions and 26 deletions
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42
fs/read_write.c
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@ -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);