introduce I_SYNC

I_LOCK was used for several unrelated purposes, which caused deadlock
situations in certain filesystems as a side effect.  One of the purposes
now uses the new I_SYNC bit.

Also document the various bits and change their order from historical to
logical.

[bunk@stusta.de: make fs/inode.c:wake_up_inode() static]
Signed-off-by: Joern Engel <joern@wohnheim.fh-wedel.de>
Cc: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Cc: David Chinner <dgc@sgi.com>
Cc: Anton Altaparmakov <aia21@cam.ac.uk>
Cc: Al Viro <viro@ftp.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 1200868a5dee..bef7d66601cb 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -69,7 +69,6 @@ struct writeback_control {
  * fs/fs-writeback.c
  */     
 void writeback_inodes(struct writeback_control *wbc);
-void wake_up_inode(struct inode *inode);
 int inode_wait(void *);
 void sync_inodes_sb(struct super_block *, int wait);
 void sync_inodes(int wait);
@@ -81,6 +80,13 @@ static inline void wait_on_inode(struct inode *inode)
         wait_on_bit(&inode->i_state, __I_LOCK, inode_wait,
                                                         TASK_UNINTERRUPTIBLE);
 }
+static inline void inode_sync_wait(struct inode *inode)
+{
+        might_sleep();
+        wait_on_bit(&inode->i_state, __I_SYNC, inode_wait,
+                                                        TASK_UNINTERRUPTIBLE);
+}
+
 
 /*
  * mm/page-writeback.c