aio: simplify arguments of aio_setup_..._rw()

We don't need req in either of those.  We don't need nr_segs in caller.
We don't really need len in caller either - iov_iter_count(&iter) will do.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/aio.c b/fs/aio.c
index 7816e8e..2ba172c 100644 (file)
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1352,43 +1352,33 @@ typedef ssize_t (aio_rw_op)(struct kiocb *, const struct iovec *,
                            unsigned long, loff_t);
 typedef ssize_t (rw_iter_op)(struct kiocb *, struct iov_iter *);
 
-static ssize_t aio_setup_vectored_rw(struct kiocb *kiocb,
-                                    int rw, char __user *buf,
-                                    unsigned long *nr_segs,
-                                    size_t *len,
-                                    struct iovec **iovec,
-                                    bool compat,
-                                    struct iov_iter *iter)
+static int aio_setup_vectored_rw(int rw, char __user *buf, size_t len,
+                                struct iovec **iovec,
+                                bool compat,
+                                struct iov_iter *iter)
 {
        ssize_t ret;
 
-       *nr_segs = *len;
-
 #ifdef CONFIG_COMPAT
        if (compat)
                ret = compat_rw_copy_check_uvector(rw,
                                (struct compat_iovec __user *)buf,
-                               *nr_segs, UIO_FASTIOV, *iovec, iovec);
+                               len, UIO_FASTIOV, *iovec, iovec);
        else
 #endif
                ret = rw_copy_check_uvector(rw,
                                (struct iovec __user *)buf,
-                               *nr_segs, UIO_FASTIOV, *iovec, iovec);
+                               len, UIO_FASTIOV, *iovec, iovec);
        if (ret < 0)
                return ret;
 
-       /* len now reflect bytes instead of segs */
-       *len = ret;
-       iov_iter_init(iter, rw, *iovec, *nr_segs, *len);
+       iov_iter_init(iter, rw, *iovec, len, ret);
        return 0;
 }
 
-static ssize_t aio_setup_single_vector(struct kiocb *kiocb,
-                                      int rw, char __user *buf,
-                                      unsigned long *nr_segs,
-                                      size_t len,
-                                      struct iovec *iovec,
-                                      struct iov_iter *iter)
+static int aio_setup_single_vector(int rw, char __user *buf, size_t len,
+                                  struct iovec *iovec,
+                                  struct iov_iter *iter)
 {
        if (len > MAX_RW_COUNT)
                len = MAX_RW_COUNT;
@@ -1397,8 +1387,7 @@ static ssize_t aio_setup_single_vector(struct kiocb *kiocb,
 
        iovec->iov_base = buf;
        iovec->iov_len = len;
-       *nr_segs = 1;
-       iov_iter_init(iter, rw, iovec, *nr_segs, len);
+       iov_iter_init(iter, rw, iovec, 1, len);
        return 0;
 }
 
@@ -1411,7 +1400,6 @@ static ssize_t aio_run_iocb(struct kiocb *req, unsigned opcode,
 {
        struct file *file = req->ki_filp;
        ssize_t ret;
-       unsigned long nr_segs;
        int rw;
        fmode_t mode;
        aio_rw_op *rw_op;
@@ -1443,13 +1431,14 @@ rw_common:
                        return -EINVAL;
 
                if (opcode == IOCB_CMD_PREADV || opcode == IOCB_CMD_PWRITEV)
-                       ret = aio_setup_vectored_rw(req, rw, buf, &nr_segs,
-                                               &len, &iovec, compat, &iter);
+                       ret = aio_setup_vectored_rw(rw, buf, len,
+                                               &iovec, compat, &iter);
                else
-                       ret = aio_setup_single_vector(req, rw, buf, &nr_segs,
-                                                 len, iovec, &iter);
+                       ret = aio_setup_single_vector(rw, buf, len,
+                                               iovec, &iter);
                if (!ret)
-                       ret = rw_verify_area(rw, file, &req->ki_pos, len);
+                       ret = rw_verify_area(rw, file, &req->ki_pos,
+                                            iov_iter_count(&iter));
                if (ret < 0) {
                        if (iovec != inline_vecs)
                                kfree(iovec);