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

[sfrench/cifs-2.6.git] / fs / read_write.c

diff --git a/fs/read_write.c b/fs/read_write.c
index 4060691e78f78ab734986a1347c1d81d117c4b90..8e1b68786d663d4be5551efcd7b0bf7d5ed8b192 100644 (file)
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -333,6 +333,52 @@ out_putf:
 }
 #endif
 
+ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos)
+{
+       struct kiocb kiocb;
+       ssize_t ret;
+
+       if (!file->f_op->read_iter)
+               return -EINVAL;
+
+       init_sync_kiocb(&kiocb, file);
+       kiocb.ki_pos = *ppos;
+       kiocb.ki_nbytes = iov_iter_count(iter);
+
+       iter->type |= READ;
+       ret = file->f_op->read_iter(&kiocb, iter);
+       if (ret == -EIOCBQUEUED)
+               ret = wait_on_sync_kiocb(&kiocb);
+
+       if (ret > 0)
+               *ppos = kiocb.ki_pos;
+       return ret;
+}
+EXPORT_SYMBOL(vfs_iter_read);
+
+ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos)
+{
+       struct kiocb kiocb;
+       ssize_t ret;
+
+       if (!file->f_op->write_iter)
+               return -EINVAL;
+
+       init_sync_kiocb(&kiocb, file);
+       kiocb.ki_pos = *ppos;
+       kiocb.ki_nbytes = iov_iter_count(iter);
+
+       iter->type |= WRITE;
+       ret = file->f_op->write_iter(&kiocb, iter);
+       if (ret == -EIOCBQUEUED)
+               ret = wait_on_sync_kiocb(&kiocb);
+
+       if (ret > 0)
+               *ppos = kiocb.ki_pos;
+       return ret;
+}
+EXPORT_SYMBOL(vfs_iter_write);
+
 /*
  * rw_verify_area doesn't like huge counts. We limit
  * them to something that fits in "int" so that others