1 files changed, 29 insertions, 2 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index c7496f263860..35ec87e490b1 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1820,7 +1820,7 @@ struct super_operations {
 #define I_SYNC                  (1 << __I_SYNC)
 #define I_REFERENCED            (1 << 8)
 #define __I_DIO_WAKEUP          9
-#define I_DIO_WAKEUP            (1 << I_DIO_WAKEUP)
+#define I_DIO_WAKEUP            (1 << __I_DIO_WAKEUP)
 #define I_LINKABLE              (1 << 10)
 #define I_DIRTY_TIME            (1 << 11)
 #define __I_DIRTY_TIME_EXPIRED  12
@@ -2644,6 +2644,9 @@ enum {
 
         /* filesystem can handle aio writes beyond i_size */
         DIO_ASYNC_EXTEND = 0x04,
+
+        /* inode/fs/bdev does not need truncate protection */
+        DIO_SKIP_DIO_COUNT = 0x08,
 };
 
 void dio_end_io(struct bio *bio, int error);
@@ -2666,7 +2669,31 @@ static inline ssize_t blockdev_direct_IO(struct kiocb *iocb,
 #endif
 
 void inode_dio_wait(struct inode *inode);
-void inode_dio_done(struct inode *inode);
+
+/*
+ * inode_dio_begin - signal start of a direct I/O requests
+ * @inode: inode the direct I/O happens on
+ *
+ * This is called once we've finished processing a direct I/O request,
+ * and is used to wake up callers waiting for direct I/O to be quiesced.
+ */
+static inline void inode_dio_begin(struct inode *inode)
+{
+        atomic_inc(&inode->i_dio_count);
+}
+
+/*
+ * inode_dio_end - signal finish of a direct I/O requests
+ * @inode: inode the direct I/O happens on
+ *
+ * This is called once we've finished processing a direct I/O request,
+ * and is used to wake up callers waiting for direct I/O to be quiesced.
+ */
+static inline void inode_dio_end(struct inode *inode)
+{
+        if (atomic_dec_and_test(&inode->i_dio_count))
+                wake_up_bit(&inode->i_state, __I_DIO_WAKEUP);
+}
 
 extern void inode_set_flags(struct inode *inode, unsigned int flags,
                             unsigned int mask);