new helpers: no_seek_end_llseek{,_size}()

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

1 files changed, 39 insertions, 0 deletions

diff --git a/fs/read_write.c b/fs/read_write.c
index 819ef3faf1bb..acb171331278 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -171,6 +171,45 @@ loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t si
 EXPORT_SYMBOL(fixed_size_llseek);
 
 /**
+ * no_seek_end_llseek - llseek implementation for fixed-sized devices
+ * @file:       file structure to seek on
+ * @offset:     file offset to seek to
+ * @whence:     type of seek
+ *
+ */
+loff_t no_seek_end_llseek(struct file *file, loff_t offset, int whence)
+{
+        switch (whence) {
+        case SEEK_SET: case SEEK_CUR:
+                return generic_file_llseek_size(file, offset, whence,
+                                                ~0ULL, 0);
+        default:
+                return -EINVAL;
+        }
+}
+EXPORT_SYMBOL(no_seek_end_llseek);
+
+/**
+ * no_seek_end_llseek_size - llseek implementation for fixed-sized devices
+ * @file:       file structure to seek on
+ * @offset:     file offset to seek to
+ * @whence:     type of seek
+ * @size:       maximal offset allowed
+ *
+ */
+loff_t no_seek_end_llseek_size(struct file *file, loff_t offset, int whence, loff_t size)
+{
+        switch (whence) {
+        case SEEK_SET: case SEEK_CUR:
+                return generic_file_llseek_size(file, offset, whence,
+                                                size, 0);
+        default:
+                return -EINVAL;
+        }
+}
+EXPORT_SYMBOL(no_seek_end_llseek_size);
+
+/**
  * noop_llseek - No Operation Performed llseek implementation
  * @file:       file structure to seek on
  * @offset:     file offset to seek to