X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Flinux%2Fwriteback.h;h=4ab519ad9f559b7eee5ef3f68c20f8f4bb1dc184;hb=6a77f38946aaee1cd85eeec6cf4229b204c15071;hp=e4450070ac78529608e65cc27014e0d5be0f1eba;hpb=9bf4aaab3e101692164d49b7ca357651eb691cb6;p=linux-2.6.git

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index e4450070a..4ab519ad9 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -29,7 +29,9 @@ enum writeback_sync_modes {
 };
 
 /*
- * A control structure which tells the writeback code what to do
+ * A control structure which tells the writeback code what to do.  These are
+ * always on the stack, and hence need no locking.  They are always initialised
+ * in a manner such that unspecified fields are set to zero.
  */
 struct writeback_control {
 	struct backing_dev_info *bdi;	/* If !NULL, only write back this
@@ -40,10 +42,19 @@ struct writeback_control {
 	long nr_to_write;		/* Write this many pages, and decrement
 					   this for each page written */
 	long pages_skipped;		/* Pages which were not written */
-	int nonblocking;		/* Don't get stuck on request queues */
-	int encountered_congestion;	/* An output: a queue is full */
-	int for_kupdate;		/* A kupdate writeback */
-	int for_reclaim;		/* Invoked from the page allocator */
+
+	/*
+	 * For a_ops->writepages(): is start or end are non-zero then this is
+	 * a hint that the filesystem need only write out the pages inside that
+	 * byterange.  The byte at `end' is included in the writeout request.
+	 */
+	loff_t start;
+	loff_t end;
+
+	unsigned nonblocking:1;			/* Don't get stuck on request queues */
+	unsigned encountered_congestion:1;	/* An output: a queue is full */
+	unsigned for_kupdate:1;			/* A kupdate writeback */
+	unsigned for_reclaim:1;			/* Invoked from the page allocator */
 };
 
 /*
@@ -57,15 +68,16 @@ struct writeback_control {
  */	
 void writeback_inodes(struct writeback_control *wbc);
 void wake_up_inode(struct inode *inode);
-void __wait_on_inode(struct inode * inode);
+int inode_wait(void *);
 void sync_inodes_sb(struct super_block *, int wait);
 void sync_inodes(int wait);
 
 /* writeback.h requires fs.h; it, too, is not included from here. */
 static inline void wait_on_inode(struct inode *inode)
 {
-	if (inode->i_state & I_LOCK)
-		__wait_on_inode(inode);
+	might_sleep();
+	wait_on_bit(&inode->i_state, __I_LOCK, inode_wait,
+							TASK_UNINTERRUPTIBLE);
 }
 
 /*
@@ -92,6 +104,10 @@ void page_writeback_init(void);
 void balance_dirty_pages_ratelimited(struct address_space *mapping);
 int pdflush_operation(void (*fn)(unsigned long), unsigned long arg0);
 int do_writepages(struct address_space *mapping, struct writeback_control *wbc);
+int sync_page_range(struct inode *inode, struct address_space *mapping,
+			loff_t pos, size_t count);
+int sync_page_range_nolock(struct inode *inode, struct address_space
+		*mapping, loff_t pos, size_t count);
 
 /* pdflush.c */
 extern int nr_pdflush_threads;	/* Global so it can be exported to sysctl