1 files changed, 26 insertions, 0 deletions

diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index b923052c29d0..97c6c0f91325 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -33,6 +33,32 @@ struct sysfs_open_file {
         const struct vm_operations_struct *vm_ops;
 };
 
+struct kernfs_ops {
+        /*
+         * Read is handled by either seq_file or raw_read().
+         *
+         * If seq_show() is present, seq_file path is active.  The behavior
+         * is equivalent to single_open().  @sf->private points to the
+         * associated sysfs_open_file.
+         *
+         * read() is bounced through kernel buffer and a read larger than
+         * PAGE_SIZE results in partial operation of PAGE_SIZE.
+         */
+        int (*seq_show)(struct seq_file *sf, void *v);
+
+        ssize_t (*read)(struct sysfs_open_file *of, char *buf, size_t bytes,
+                        loff_t off);
+
+        /*
+         * write() is bounced through kernel buffer and a write larger than
+         * PAGE_SIZE results in partial operation of PAGE_SIZE.
+         */
+        ssize_t (*write)(struct sysfs_open_file *of, char *buf, size_t bytes,
+                         loff_t off);
+
+        int (*mmap)(struct sysfs_open_file *of, struct vm_area_struct *vma);
+};
+
 #ifdef CONFIG_SYSFS
 
 struct sysfs_dirent *kernfs_create_dir_ns(struct sysfs_dirent *parent,