filesystem freeze: implement generic freeze feature

[linux-2.6-omap-h63xx.git] / include / linux / buffer_head.h

diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 3ce64b90118c20346a704d1c727ec9450d7ccb95..bd7ac793be19b80254c421922ede4d540436fd47 100644 (file)
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -35,6 +35,7 @@ enum bh_state_bits {
        BH_Ordered,     /* ordered write */
        BH_Eopnotsupp,  /* operation not supported (barrier) */
        BH_Unwritten,   /* Buffer is allocated on disk but not written */
+       BH_Quiet,       /* Buffer Error Prinks to be quiet */
 
        BH_PrivateStart,/* not a state bit, but the first bit available
                         * for private allocation by other entities
@@ -170,7 +171,7 @@ void __wait_on_buffer(struct buffer_head *);
 wait_queue_head_t *bh_waitq_head(struct buffer_head *bh);
 int fsync_bdev(struct block_device *);
 struct super_block *freeze_bdev(struct block_device *);
-void thaw_bdev(struct block_device *, struct super_block *);
+int thaw_bdev(struct block_device *, struct super_block *);
 int fsync_super(struct super_block *);
 int fsync_no_super(struct block_device *);
 struct buffer_head *__find_get_block(struct block_device *bdev, sector_t block,
@@ -345,6 +346,15 @@ static inline int remove_inode_buffers(struct inode *inode) { return 1; }
 static inline int sync_mapping_buffers(struct address_space *mapping) { return 0; }
 static inline void invalidate_bdev(struct block_device *bdev) {}
 
+static inline struct super_block *freeze_bdev(struct block_device *sb)
+{
+       return NULL;
+}
+
+static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
+{
+       return 0;
+}
 
 #endif /* CONFIG_BLOCK */
 #endif /* _LINUX_BUFFER_HEAD_H */