1 files changed, 21 insertions, 4 deletions

diff --git a/fs/read_write.c b/fs/read_write.c
index 113386d6fd2d..74e36586e4d3 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -97,6 +97,23 @@ loff_t generic_file_llseek(struct file *file, loff_t offset, int origin)
 }
 EXPORT_SYMBOL(generic_file_llseek);
 
+/**
+ * noop_llseek - No Operation Performed llseek implementation
+ * @file:       file structure to seek on
+ * @offset:     file offset to seek to
+ * @origin:     type of seek
+ *
+ * This is an implementation of ->llseek useable for the rare special case when
+ * userspace expects the seek to succeed but the (device) file is actually not
+ * able to perform the seek. In this case you use noop_llseek() instead of
+ * falling back to the default implementation of ->llseek.
+ */
+loff_t noop_llseek(struct file *file, loff_t offset, int origin)
+{
+        return file->f_pos;
+}
+EXPORT_SYMBOL(noop_llseek);
+
 loff_t no_llseek(struct file *file, loff_t offset, int origin)
 {
         return -ESPIPE;
@@ -294,7 +311,7 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
                 else
                         ret = do_sync_read(file, buf, count, pos);
                 if (ret > 0) {
-                        fsnotify_access(file->f_path.dentry);
+                        fsnotify_access(file);
                         add_rchar(current, ret);
                 }
                 inc_syscr(current);
@@ -350,7 +367,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
                 else
                         ret = do_sync_write(file, buf, count, pos);
                 if (ret > 0) {
-                        fsnotify_modify(file->f_path.dentry);
+                        fsnotify_modify(file);
                         add_wchar(current, ret);
                 }
                 inc_syscw(current);
@@ -658,9 +675,9 @@ out:
                 kfree(iov);
         if ((ret + (type == READ)) > 0) {
                 if (type == READ)
-                        fsnotify_access(file->f_path.dentry);
+                        fsnotify_access(file);
                 else
-                        fsnotify_modify(file->f_path.dentry);
+                        fsnotify_modify(file);
         }
         return ret;
 }