1 files changed, 60 insertions, 0 deletions

diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
new file mode 100644
index 000000000000..b0ed1887d9b1
--- /dev/null
+++ b/fs/btrfs/compat.h
@@ -0,0 +1,60 @@
+#ifndef _COMPAT_H_
+#define _COMPAT_H_
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,26)
+#define trylock_page(page) (!TestSetPageLocked(page))
+#endif
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,27)
+static inline struct dentry *d_obtain_alias(struct inode *inode)
+{
+        struct dentry *d;
+
+        if (!inode)
+                return NULL;
+        if (IS_ERR(inode))
+                return ERR_CAST(inode);
+
+        d = d_alloc_anon(inode);
+        if (!d)
+                iput(inode);
+        return d;
+}
+#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.
+ */
+#if defined(CONFIG_SUSE_KERNEL)
+# if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
+# define REMOVE_SUID_PATH 1
+# endif
+#endif
+
+/*
+ * catch any other distros that have patched in apparmor.  This isn't
+ * 100% reliable because it won't catch people that hand compile their
+ * own distro kernels without apparmor compiled in.  But, it is better
+ * than nothing.
+ */
+#ifdef CONFIG_SECURITY_APPARMOR
+# define REMOVE_SUID_PATH 1
+#endif
+
+#endif /* _COMPAT_H_ */