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authorChris Mason <chris.mason@oracle.com>2008-09-05 16:13:11 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:04:07 -0400
commite02119d5a7b4396c5a872582fddc8bd6d305a70a (patch)
tree825efe2a79dbca8d61256183f3526a5b5dc40dc6 /fs/btrfs/compat.h
parenta1b32a5932cfac7c38b442582285f3da2a09dfd8 (diff)
Btrfs: Add a write ahead tree log to optimize synchronous operations
File syncs and directory syncs are optimized by copying their items into a special (copy-on-write) log tree. There is one log tree per subvolume and the btrfs super block points to a tree of log tree roots. After a crash, items are copied out of the log tree and back into the subvolume. See tree-log.c for all the details. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/compat.h')
-rw-r--r--fs/btrfs/compat.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index d45fb37887b..b0ed1887d9b 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -22,6 +22,21 @@ static inline struct dentry *d_obtain_alias(struct inode *inode)
}
#endif
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
+static inline void btrfs_drop_nlink(struct inode *inode)
+{
+ inode->i_nlink--;
+}
+
+static inline void btrfs_inc_nlink(struct inode *inode)
+{
+ inode->i_nlink++;
+}
+#else
+# define btrfs_drop_nlink(inode) drop_nlink(inode)
+# define btrfs_inc_nlink(inode) inc_nlink(inode)
+#endif
+
/*
* Even if AppArmor isn't enabled, it still has different prototypes.
* Add more distro/version pairs here to declare which has AppArmor applied.