Merge branch 'for-next/linux-headers'

1 files changed, 80 insertions, 0 deletions

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
new file mode 100644
index 0000000000..dfb466722c
--- /dev/null
+++ b/include/linux/dcache.h
@@ -0,0 +1,80 @@
+#ifndef __LINUX_DCACHE_H
+#define __LINUX_DCACHE_H
+
+/*
+ * linux/include/linux/dcache.h
+ *
+ * Dirent cache data structures
+ *
+ * (C) Copyright 1997 Thomas Schoebel-Theuer,
+ * with heavy changes by Linus Torvalds
+ */
+
+#include <linux/list.h>
+#include <linux/spinlock.h>
+
+#define IS_ROOT(x) ((x) == (x)->d_parent)
+
+/* The hash is always the low bits of hash_len */
+#ifdef __LITTLE_ENDIAN
+ #define HASH_LEN_DECLARE u32 hash; u32 len
+ #define bytemask_from_count(cnt)	(~(~0ul << (cnt)*8))
+#else
+ #define HASH_LEN_DECLARE u32 len; u32 hash
+ #define bytemask_from_count(cnt)	(~(~0ul >> (cnt)*8))
+#endif
+
+/*
+ * "quick string" -- eases parameter passing, but more importantly
+ * saves "metadata" about the string (ie length and the hash).
+ *
+ * hash comes first so it snuggles against d_parent in the
+ * dentry.
+ */
+struct qstr {
+	union {
+		struct {
+			HASH_LEN_DECLARE;
+		};
+		u64 hash_len;
+	};
+	const unsigned char *name;
+};
+
+#define QSTR_INIT(n,l) { { { .len = l } }, .name = n }
+#define hashlen_hash(hashlen) ((u32) (hashlen))
+#define hashlen_len(hashlen)  ((u32)((hashlen) >> 32))
+#define hashlen_create(hash,len) (((u64)(len)<<32)|(u32)(hash))
+
+#define DNAME_INLINE_LEN_MIN 36
+
+struct dentry {
+	unsigned int d_flags;		/* protected by d_lock */
+	spinlock_t d_lock;		/* per dentry lock */
+	struct inode *d_inode;		/* Where the name belongs to - NULL is
+					 * negative */
+	/*
+	 * The next three fields are touched by __d_lookup.  Place them here
+	 * so they all fit in a cache line.
+	 */
+	struct hlist_node d_hash;	/* lookup hash list */
+	struct dentry *d_parent;	/* parent directory */
+	struct qstr d_name;
+
+	struct list_head d_lru;		/* LRU list */
+	/*
+	 * d_child and d_rcu can share memory
+	 */
+	struct list_head d_subdirs;	/* our children */
+	struct list_head d_alias;	/* inode alias list */
+	unsigned long d_time;		/* used by d_revalidate */
+	struct super_block *d_sb;	/* The root of the dentry tree */
+	void *d_fsdata;			/* fs-specific data */
+#ifdef CONFIG_PROFILING
+	struct dcookie_struct *d_cookie; /* cookie, if any */
+#endif
+	int d_mounted;
+	unsigned char d_iname[DNAME_INLINE_LEN_MIN];	/* small names */
+};
+
+#endif	/* __LINUX_DCACHE_H */