Merge branch 'uaccess.__copy_to_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull uaccess/__copy_to_user updates from Al Viro:
 "Getting rid of __copy_to_user() callers - stuff that doesn't fit into
  other series"

* 'uaccess.__copy_to_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  dlmfs: convert dlmfs_file_read() to copy_to_user()
  esas2r: don't bother with __copy_to_user()

Author: torvalds

drivers/scsi/esas2r/esas2r_ioctl.c

@@ -1510,7 +1510,7 @@ int esas2r_ioctl_handler(void *hostdata, unsigned int cmd, void __user *arg)
 	}
 
 	/* Always copy the buffer back, if only to pick up the status */
-	err = __copy_to_user(arg, ioctl, sizeof(struct atto_express_ioctl));
+	err = copy_to_user(arg, ioctl, sizeof(struct atto_express_ioctl));
 	if (err != 0) {
 		esas2r_log(ESAS2R_LOG_WARN,
 			   "ioctl_handler copy_to_user didn't copy everything (err %d, cmd %u)",

fs/ocfs2/dlmfs/dlmfs.c

@@ -227,7 +227,7 @@ static ssize_t dlmfs_file_read(struct file *filp,
 			       loff_t *ppos)
 {
 	int bytes_left;
-	ssize_t readlen, got;
+	ssize_t got;
 	char *lvb_buf;
 	struct inode *inode = file_inode(filp);
 
@@ -237,36 +237,31 @@ static ssize_t dlmfs_file_read(struct file *filp,
 	if (*ppos >= i_size_read(inode))
 		return 0;
 
+	/* don't read past the lvb */
+	if (count > i_size_read(inode) - *ppos)
+		count = i_size_read(inode) - *ppos;
+
 	if (!count)
 		return 0;
 
-	if (!access_ok(buf, count))
-		return -EFAULT;
-
-	/* don't read past the lvb */
-	if ((count + *ppos) > i_size_read(inode))
-		readlen = i_size_read(inode) - *ppos;
-	else
-		readlen = count;
-
-	lvb_buf = kmalloc(readlen, GFP_NOFS);
+	lvb_buf = kmalloc(count, GFP_NOFS);
 	if (!lvb_buf)
 		return -ENOMEM;
 
-	got = user_dlm_read_lvb(inode, lvb_buf, readlen);
+	got = user_dlm_read_lvb(inode, lvb_buf, count);
 	if (got) {
-		BUG_ON(got != readlen);
-		bytes_left = __copy_to_user(buf, lvb_buf, readlen);
-		readlen -= bytes_left;
+		BUG_ON(got != count);
+		bytes_left = copy_to_user(buf, lvb_buf, count);
+		count -= bytes_left;
 	} else
-		readlen = 0;
+		count = 0;
 
 	kfree(lvb_buf);
 
-	*ppos = *ppos + readlen;
+	*ppos = *ppos + count;
 
-	mlog(0, "read %zd bytes\n", readlen);
-	return readlen;
+	mlog(0, "read %zu bytes\n", count);
+	return count;
 }
 
 static ssize_t dlmfs_file_write(struct file *filp,