#ifndef __BTRFS__
#define __BTRFS__
-#include "list.h"
-#include "kerncompat.h"
+#include <linux/fs.h>
+#include "bit-radix.h"
+
+struct btrfs_trans_handle;
+struct btrfs_transaction;
#define BTRFS_MAGIC "_BtRfS_M"
-#define BTRFS_ROOT_TREE_OBJECTID 1
-#define BTRFS_EXTENT_TREE_OBJECTID 2
-#define BTRFS_FS_TREE_OBJECTID 3
+#define BTRFS_ROOT_TREE_OBJECTID 1ULL
+#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
+#define BTRFS_INODE_MAP_OBJECTID 3ULL
+#define BTRFS_FS_TREE_OBJECTID 4ULL
+#define BTRFS_FIRST_FREE_OBJECTID 5ULL
+
+/*
+ * we can actually store much bigger names, but lets not confuse the rest
+ * of linux
+ */
+#define BTRFS_NAME_LEN 255
/*
* the key defines the order in the tree, and so it also defines (optimal)
struct btrfs_header {
u8 fsid[16]; /* FS specific uuid */
__le64 blocknr; /* which block this node is supposed to live in */
+ __le64 generation;
__le64 parentid; /* objectid of the tree root */
__le32 csum;
__le32 ham;
__le16 nritems;
__le16 flags;
- /* generation flags to be added */
+ u8 level;
} __attribute__ ((__packed__));
#define BTRFS_MAX_LEVEL 8
#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
-struct btrfs_buffer;
+struct buffer_head;
/*
* the super block basically lists the main trees of the FS
* it currently lacks any block count etc etc
__le64 root;
__le64 total_blocks;
__le64 blocks_used;
+ __le64 root_dir_objectid;
} __attribute__ ((__packed__));
/*
* used while walking the tree.
*/
struct btrfs_path {
- struct btrfs_buffer *nodes[BTRFS_MAX_LEVEL];
+ struct buffer_head *nodes[BTRFS_MAX_LEVEL];
int slots[BTRFS_MAX_LEVEL];
};
__le64 block_limit;
__le64 blocks_used;
__le32 refs;
+} __attribute__ ((__packed__));
+
+struct btrfs_file_extent_item {
+ /*
+ * disk space consumed by the extent, checksum blocks are included
+ * in these numbers
+ */
+ __le64 disk_blocknr;
+ __le64 disk_num_blocks;
+ /*
+ * the logical offset in file blocks (no csums)
+ * this extent record is for. This allows a file extent to point
+ * into the middle of an existing extent on disk, sharing it
+ * between two snapshots (useful if some bytes in the middle of the
+ * extent have changed
+ */
+ __le64 offset;
+ /*
+ * the logical number of file blocks (no csums included)
+ */
+ __le64 num_blocks;
+} __attribute__ ((__packed__));
+
+struct btrfs_inode_map_item {
+ struct btrfs_disk_key key;
+} __attribute__ ((__packed__));
+
+struct btrfs_fs_info {
+ struct btrfs_root *fs_root;
+ struct btrfs_root *extent_root;
+ struct btrfs_root *tree_root;
+ struct btrfs_root *inode_root;
+ struct btrfs_key current_insert;
+ struct btrfs_key last_insert;
+ struct radix_tree_root pending_del_radix;
+ struct radix_tree_root pinned_radix;
+ u64 last_inode_alloc;
+ u64 last_inode_alloc_dirid;
+ u64 generation;
+ struct btrfs_transaction *running_transaction;
+ struct btrfs_super_block *disk_super;
+ struct buffer_head *sb_buffer;
+ struct super_block *sb;
+ struct mutex trans_mutex;
+ struct mutex fs_mutex;
};
/*
* only for the extent tree.
*/
struct btrfs_root {
- struct btrfs_buffer *node;
- struct btrfs_buffer *commit_root;
- struct btrfs_root *extent_root;
- struct btrfs_root *tree_root;
- struct btrfs_key current_insert;
- struct btrfs_key last_insert;
- int fp;
- struct radix_tree_root cache_radix;
- struct radix_tree_root pinned_radix;
- struct list_head trans;
- struct list_head cache;
- int cache_size;
- int ref_cows;
+ struct buffer_head *node;
+ struct buffer_head *commit_root;
struct btrfs_root_item root_item;
struct btrfs_key root_key;
+ struct btrfs_fs_info *fs_info;
u32 blocksize;
+ int ref_cows;
+ u32 type;
};
/* the lower bits in the key flags defines the item type */
* are used, and how many references there are to each block
*/
#define BTRFS_EXTENT_ITEM_KEY 6
+
+/*
+ * the inode map records which inode numbers are in use and where
+ * they actually live on disk
+ */
+#define BTRFS_INODE_MAP_ITEM_KEY 7
/*
* string items are for debugging. They just store a short string of
* data in the FS
*/
-#define BTRFS_STRING_ITEM_KEY 7
+#define BTRFS_STRING_ITEM_KEY 8
static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
{
i->compat_flags = cpu_to_le16(val);
}
+static inline u32 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
+{
+ return le32_to_cpu(ts->sec);
+}
+
+static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
+ u32 val)
+{
+ ts->sec = cpu_to_le32(val);
+}
+
+static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
+{
+ return le32_to_cpu(ts->nsec);
+}
+
+static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
+ u32 val)
+{
+ ts->nsec = cpu_to_le32(val);
+}
+
+
static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
{
h->blocknr = cpu_to_le64(blocknr);
}
+static inline u64 btrfs_header_generation(struct btrfs_header *h)
+{
+ return le64_to_cpu(h->generation);
+}
+
+static inline void btrfs_set_header_generation(struct btrfs_header *h,
+ u64 val)
+{
+ h->generation = cpu_to_le64(val);
+}
+
static inline u64 btrfs_header_parentid(struct btrfs_header *h)
{
return le64_to_cpu(h->parentid);
static inline int btrfs_header_level(struct btrfs_header *h)
{
- return btrfs_header_flags(h) & (BTRFS_MAX_LEVEL - 1);
+ return h->level;
}
static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
{
- u16 flags;
BUG_ON(level > BTRFS_MAX_LEVEL);
- flags = btrfs_header_flags(h) & ~(BTRFS_MAX_LEVEL - 1);
- btrfs_set_header_flags(h, flags | level);
+ h->level = level;
}
static inline int btrfs_is_leaf(struct btrfs_node *n)
s->blocksize = cpu_to_le32(val);
}
+static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
+{
+ return le64_to_cpu(s->root_dir_objectid);
+}
+
+static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
+ val)
+{
+ s->root_dir_objectid = cpu_to_le64(val);
+}
+
static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
{
return (u8 *)l->items;
}
+
+static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
+ *e)
+{
+ return le64_to_cpu(e->disk_blocknr);
+}
+
+static inline void btrfs_set_file_extent_disk_blocknr(struct
+ btrfs_file_extent_item
+ *e, u64 val)
+{
+ e->disk_blocknr = cpu_to_le64(val);
+}
+
+static inline u64 btrfs_file_extent_disk_num_blocks(struct
+ btrfs_file_extent_item *e)
+{
+ return le64_to_cpu(e->disk_num_blocks);
+}
+
+static inline void btrfs_set_file_extent_disk_num_blocks(struct
+ btrfs_file_extent_item
+ *e, u64 val)
+{
+ e->disk_num_blocks = cpu_to_le64(val);
+}
+
+static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
+{
+ return le64_to_cpu(e->offset);
+}
+
+static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
+ *e, u64 val)
+{
+ e->offset = cpu_to_le64(val);
+}
+
+static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
+ *e)
+{
+ return le64_to_cpu(e->num_blocks);
+}
+
+static inline void btrfs_set_file_extent_num_blocks(struct
+ btrfs_file_extent_item *e,
+ u64 val)
+{
+ e->num_blocks = cpu_to_le64(val);
+}
+
+static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
+{
+ return sb->s_fs_info;
+}
+
/* helper function to cast into the data area of the leaf. */
#define btrfs_item_ptr(leaf, slot, type) \
((type *)(btrfs_leaf_data(leaf) + \
btrfs_item_offset((leaf)->items + (slot))))
-struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_root *root);
-int btrfs_inc_ref(struct btrfs_root *root, struct btrfs_buffer *buf);
-int btrfs_free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks);
-int btrfs_search_slot(struct btrfs_root *root, struct btrfs_key *key,
- struct btrfs_path *p, int ins_len, int cow);
+/* extent-item.c */
+struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root);
+int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, u64 num_blocks, u64 search_start, u64
+ search_end, u64 owner, struct btrfs_key *ins);
+int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
+ struct buffer_head *buf);
+int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, u64 blocknr, u64 num_blocks, int pin);
+int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
+ btrfs_root *root);
+/* ctree.c */
+int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_key *key, struct btrfs_path *p, int
+ ins_len, int cow);
void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
void btrfs_init_path(struct btrfs_path *p);
-int btrfs_del_item(struct btrfs_root *root, struct btrfs_path *path);
-int btrfs_insert_item(struct btrfs_root *root, struct btrfs_key *key,
- void *data, u32 data_size);
-int btrfs_insert_empty_item(struct btrfs_root *root, struct btrfs_path *path,
- struct btrfs_key *cpu_key, u32 data_size);
+int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
+ struct btrfs_path *path);
+int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_key *key, void *data, u32 data_size);
+int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_path *path, struct btrfs_key
+ *cpu_key, u32 data_size);
int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
-int btrfs_drop_snapshot(struct btrfs_root *root, struct btrfs_buffer *snap);
-int btrfs_finish_extent_commit(struct btrfs_root *root);
-int btrfs_del_root(struct btrfs_root *root, struct btrfs_key *key);
-int btrfs_insert_root(struct btrfs_root *root, struct btrfs_key *key,
- struct btrfs_root_item *item);
-int btrfs_update_root(struct btrfs_root *root, struct btrfs_key *key,
- struct btrfs_root_item *item);
-int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
- struct btrfs_root_item *item, struct btrfs_key *key);
-int btrfs_insert_dir_item(struct btrfs_root *root, char *name, int name_len,
- u64 dir, u64 objectid, u8 type);
-int btrfs_lookup_dir_item(struct btrfs_root *root, struct btrfs_path *path,
- u64 dir, char *name, int name_len, int mod);
+int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct buffer_head *snap);
+/* root-item.c */
+int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
+ struct btrfs_key *key);
+int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_key *key, struct btrfs_root_item
+ *item);
+int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_key *key, struct btrfs_root_item
+ *item);
+int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
+ btrfs_root_item *item, struct btrfs_key *key);
+/* dir-item.c */
+int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, const char *name, int name_len, u64 dir, u64
+ objectid, u8 type);
+int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_path *path, u64 dir,
+ const char *name, int name_len, int mod);
int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
- char *name, int name_len);
+ const char *name, int name_len);
+/* inode-map.c */
+int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
+ struct btrfs_root *fs_root,
+ u64 dirid, u64 *objectid);
+int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 objectid, struct btrfs_key *location);
+int btrfs_lookup_inode_map(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct btrfs_path *path,
+ u64 objectid, int mod);
+/* inode-item.c */
+int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, u64 objectid, struct btrfs_inode_item
+ *inode_item);
+int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_path *path, u64 objectid, int mod);
+
+/* file-item.c */
+int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 objectid, u64 offset,
+ u64 num_blocks, u64 hint_block,
+ u64 *result);
+int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 objectid,
+ u64 blocknr, u64 num_blocks, int mod);
#endif
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