From: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
Subject: [RFC][PATCH 04/15] nilfs2: introduce xanode's entry related declarations
This patch adds declaration of structures, macros and auxiliary
functions for xanode's entries processing.
Signed-off-by: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
CC: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
---
fs/nilfs2/xafile.h | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 97 insertions(+)
diff --git a/fs/nilfs2/xafile.h b/fs/nilfs2/xafile.h
index 34e4bb9..cee7b03 100644
--- a/fs/nilfs2/xafile.h
+++ b/fs/nilfs2/xafile.h
@@ -147,6 +147,20 @@ union nilfs_xattr_key {
nilfs_xattr_leaf_key leaf_key;
};
+/*
+ * struct nilfs_xanode_entry - xanode's entry
+ * @name: xattr's name
+ * @value: xattr's value
+ * @value_hash: complex hash of xattr's value
+ */
+struct nilfs_xanode_entry {
+ union {
+ char name[0];
+ char value[0];
+ struct nilfs_xattr_value_hash value_hash;
+ } __packed;
+} __packed;
+
/* Xanode related declarations */
#define BH_DATA(bh) \
((char *)(((struct buffer_head *)(bh))->b_data))
@@ -320,4 +334,87 @@ NILFS_XANODE_LAST_NOT_INDEX_KEY(union nilfs_xanode_header *hdr_ptr)
BUG();
}
+/* Entry related declarations */
+#define NILFS_XANODE_ENTRY_PTR(ptr) ((struct nilfs_xanode_entry *)(ptr))
+
+static inline
+__u16 NILFS_XANODE_ENTRY_OFFSET(union nilfs_xattr_key *key)
+{
+ if (IS_END_KEY(key))
+ return 0;
+
+ switch (NILFS_XANODE_KEY_TYPE(key)) {
+ case NILFS_XATTR_TREE_LEAF_KEY_TYPE:
+ return le16_to_cpu(key->leaf_key.entry_offset);
+ };
+ BUG();
+}
+
+static inline
+void NILFS_XANODE_ADD_ENTRY_OFFSET(__u16 val, union nilfs_xattr_key *key)
+{
+ switch (NILFS_XANODE_KEY_TYPE(key)) {
+ case NILFS_XATTR_TREE_LEAF_KEY_TYPE:
+ le16_add_cpu(&key->leaf_key.entry_offset, val);
+ return;
+ };
+ BUG();
+}
+
+#define NILFS_XATTR_ENTRY_OFFSET(hdr_ptr, entry_ptr) \
+ ((char *)hdr_ptr + NILFS_XANODE_SIZE - (char *)entry_ptr)
+
+static inline
+__u16 NILFS_XANODE_ENTRY_SIZE(union nilfs_xattr_key *key)
+{
+ if (IS_END_KEY(key))
+ return 0;
+
+ switch (NILFS_XANODE_KEY_TYPE(key)) {
+ case NILFS_XATTR_TREE_LEAF_KEY_TYPE:
+ return le16_to_cpu(key->leaf_key.entry_size);
+ };
+ BUG();
+}
+
+#define NILFS_XATTR_ENTRY_SIZE(name, value_size) \
+ (strlen((const char *)(name)) + value_size)
+
+static inline
+struct nilfs_xattr_name_hash *NILFS_XANODE_NAME_HASH(union nilfs_xattr_key *key)
+{
+ switch (NILFS_XANODE_KEY_TYPE(key)) {
+ case NILFS_XATTR_TREE_LEAF_KEY_TYPE:
+ return &key->leaf_key.name_hash;
+ };
+ BUG();
+}
+
+#define NILFS_XANODE_ENTRY(key, hdr_ptr) \
+ (NILFS_XANODE_ENTRY_PTR((char *)(hdr_ptr) + \
+ NILFS_XANODE_SIZE - NILFS_XANODE_ENTRY_OFFSET(key)))
+
+static inline
+struct nilfs_xanode_entry *
+NILFS_XANODE_LAST_ENTRY(union nilfs_xanode_header *hdr)
+{
+ switch (NILFS_XANODE_TYPE(hdr)) {
+ case NILFS_XATTR_TREE_XANODE_TYPE: {
+ nilfs_xattr_leaf_key *key;
+
+ key = NILFS_XANODE_LAST_LEAF_KEY(hdr);
+ if (IS_END_KEY(key))
+ return NILFS_XANODE_ENTRY_PTR((char *)(hdr) +
+ NILFS_XANODE_SIZE);
+ else
+ return NILFS_XANODE_ENTRY(NILFS_XANODE_KEY(key),
+ hdr);
+ }
+ };
+ BUG();
+}
+
+#define NILFS_XATTR_VALUE(entry, key) \
+ ((char *)(entry) + NILFS_XANODE_NAME_HASH(key)->name_len)
+
#endif /* _NILFS_XAFILE_H */
--
1.7.9.5
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