From: Vyacheslav Dubeyko <[email protected]> Subject: [RFC][STEP 1][PATCH v2 04/17] 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 <[email protected]> CC: Ryusuke Konishi <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
