This commit adds 5 new structures that will be used in the itree code.
On-disk:
struct itree_entry Single entry in an itree_node.
struct itree_node A non-leaf node in the itree.
struct itree_leaf_head Comes first in every itree leaf block.
struct itree_leaf_entry A dirent in itree leaf.
Memory only:
struct itree_frame Represents a path through a tree to one of
its leaves.
struct itree_key For representing the key for itree, which
is an inode number and file name hash
Signed-off-by: Radek Pazdera <rpazdera@xxxxxxxxxx>
---
fs/ext4/namei.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index a3697a7..56caf3a 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -261,6 +261,56 @@ struct dx_tail {
struct dx_itree_entry *itree;
};
+/*
+ * itree structures
+ */
+
+/* A single entry in the itree_node */
+struct itree_entry {
+ __le32 inode;
+ __le32 hash;
+ __le64 block;
+ __u8 fullness;
+ __u8 flags;
+};
+
+#define ITREE_NODE_FL_CONT 1
+
+/* A non-leaf node of the itree */
+struct itree_node {
+ __le16 count;
+ __le16 limit;
+ __le32 checksum;
+ __u8 indirect_levels;
+ struct itree_entry entries[0];
+};
+
+/* Comes first in every itree leaf block */
+struct itree_leaf_head {
+ __le32 checksum;
+ __le32 used_length;
+};
+
+/* A dirent with hash in an itree leaf block */
+#define ITREE_LE_HEAD_LEN 4
+struct itree_leaf_entry {
+ __le32 hash;
+ struct ext4_dir_entry_2 dirent;
+};
+
+/* For easier manipulation of the compound key */
+struct itree_key {
+ u32 inode;
+ u32 hash;
+};
+
+/* Represents a position within an itree_node block */
+struct itree_frame {
+ struct buffer_head *bh;
+ struct itree_entry *entries;
+ struct itree_entry *at;
+};
+
static inline ext4_lblk_t dx_get_block(struct dx_entry *entry);
static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value);
static inline unsigned dx_get_hash(struct dx_entry *entry);
--
1.7.11.7
--
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