Re: [PATCH v4 2/3] Add preadv and pwritev system calls.

  Hi,

Please remember to add the function prototypes to
include/linux/syscalls.h.

Done.

quoted

+asmlinkage ssize_t
+compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
+                  unsigned long vlen, u32 pos_high, u32 pos_low)
+{.
+        loff_t pos = ((loff_t)pos_high << 32) | pos_low;

This is whitespace damaged, as are the other four functions in the
same place.

Fixed.

quoted

+	struct file *file;
+	ssize_t ret = -EBADF;
+
+	if (pos < 0)
+		return -EINVAL;
+
+	file = fget(fd);
+	if (!file)
+		return -EBADF;

Any reason for using fget() here, but fget_light() in sys_preadv?

Due to the new syscalls being derived from the readv()/preadv()
versions, which have the same inconsistency.  Dunno why.  I'd suspect
the reason is that the compat syscalls tend to be overlooked when the
code is updated.  Proof: patch #1 in this series ...

I'll switch them all over in a separate followup patch.

quoted

+	if (!(file->f_mode & FMODE_READ))
+		goto out;
+
+	ret = -EINVAL;
+	if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
+		goto out;

Maybe this logic could get moved into a compat_readv() function,
similar to vfs_readv().

Yes, makes sense.

cheers,
  Gerd


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