kill generic_segment_checks()

all callers of ->aio_read() and ->aio_write() have iov/nr_segs already
checked - generic_segment_checks() done after that is just an odd way
to spell iov_length().

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

6 files changed, 9 insertions, 39 deletions

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 1dafe0701daf..a0a94a30d85a 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1726,12 +1726,7 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
 
 	mutex_lock(&inode->i_mutex);
 
-	err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ);
-	if (err) {
-		mutex_unlock(&inode->i_mutex);
-		goto out;
-	}
-	count = ocount;
+	count = ocount = iov_length(iov, nr_segs);
 
 	current->backing_dev_info = inode->i_mapping->backing_dev_info;
 	err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index ef9115e4a6fa..21a56c27b74c 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -828,12 +828,8 @@ again:
 		     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
 		     ceph_cap_string(got));
 
-		if (!read) {
-			ret = generic_segment_checks(iov, &nr_segs,
-							&len, VERIFY_WRITE);
-			if (ret)
-				goto out;
-		}
+		if (!read)
+			len = iov_length(iov, nr_segs);
 
 		iov_iter_init(&i, iov, nr_segs, len, read);
 
@@ -855,7 +851,6 @@ again:
 
 		ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
 	}
-out:
 	dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
 	     inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
 	ceph_put_cap_refs(ci, got);
@@ -911,9 +906,7 @@ static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
 
 	mutex_lock(&inode->i_mutex);
 
-	err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
-	if (err)
-		goto out;
+	count = iov_length(iov, nr_segs);
 
 	/* We can write back this queue in page reclaim */
 	current->backing_dev_info = file->f_mapping->backing_dev_info;
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 126deb5d0a9c..9c7f346879e7 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1208,12 +1208,7 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 
 	WARN_ON(iocb->ki_pos != pos);
 
-	ocount = 0;
-	err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ);
-	if (err)
-		return err;
-
-	count = ocount;
+	count = ocount = iov_length(iov, nr_segs);
 	mutex_lock(&inode->i_mutex);
 
 	/* We can write back this queue in page reclaim */
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index db9bd8a31725..b6fa457d8d01 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -2091,10 +2091,7 @@ static ssize_t ntfs_file_aio_write_nolock(struct kiocb *iocb,
 	size_t count;		/* after file limit checks */
 	ssize_t written, err;
 
-	count = 0;
-	err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
-	if (err)
-		return err;
+	count = iov_length(iov, nr_segs);
 	pos = *ppos;
 	/* We can write back this queue in page reclaim. */
 	current->backing_dev_info = mapping->backing_dev_info;
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index d6d78c2aa96e..d33c4ced0baf 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2355,12 +2355,7 @@ relock:
 	/* communicate with ocfs2_dio_end_io */
 	ocfs2_iocb_set_rw_locked(iocb, rw_level);
 
-	ret = generic_segment_checks(iov, &nr_segs, &ocount,
-				     VERIFY_READ);
-	if (ret)
-		goto out_dio;
-
-	count = ocount;
+	count = ocount = iov_length(iov, nr_segs);
 	ret = generic_write_checks(file, ppos, &count,
 				   S_ISBLK(inode->i_mode));
 	if (ret)
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 8617497867c7..f0f8084a67be 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -253,9 +253,7 @@ xfs_file_aio_read(
 	if (file->f_mode & FMODE_NOCMTIME)
 		ioflags |= IO_INVIS;
 
-	ret = generic_segment_checks(iovp, &nr_segs, &size, VERIFY_WRITE);
-	if (ret < 0)
-		return ret;
+	size = iov_length(iovp, nr_segs);
 
 	if (unlikely(ioflags & IO_ISDIRECT)) {
 		xfs_buftarg_t	*target =
@@ -777,10 +775,7 @@ xfs_file_aio_write(
 
 	BUG_ON(iocb->ki_pos != pos);
 
-	ret = generic_segment_checks(iovp, &nr_segs, &ocount, VERIFY_READ);
-	if (ret)
-		return ret;
-
+	ocount = iov_length(iovp, nr_segs);
 	if (ocount == 0)
 		return 0;