Btrfs: Add inode map, and the start of file extent items
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
committed by
David Woodhouse
David Woodhouse
parent
631d7d950a
commit
9f5fae2fe6
129
fs/btrfs/ctree.h
129
fs/btrfs/ctree.h
@@ -10,7 +10,8 @@ struct btrfs_trans_handle;
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#define BTRFS_ROOT_TREE_OBJECTID 1
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#define BTRFS_EXTENT_TREE_OBJECTID 2
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#define BTRFS_FS_TREE_OBJECTID 3
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#define BTRFS_INODE_MAP_OBJECTID 3
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#define BTRFS_FS_TREE_OBJECTID 4
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/*
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* the key defines the order in the tree, and so it also defines (optimal)
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@@ -178,6 +179,49 @@ struct btrfs_root_item {
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__le64 block_limit;
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__le64 blocks_used;
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__le32 refs;
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} __attribute__ ((__packed__));
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struct btrfs_file_extent_item {
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/*
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* disk space consumed by the extent, checksum blocks are included
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* in these numbers
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*/
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__le64 disk_blocknr;
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__le64 disk_num_blocks;
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/*
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* the logical offset in file bytes (no csums)
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* this extent record is for. This allows a file extent to point
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* into the middle of an existing extent on disk, sharing it
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* between two snapshots (useful if some bytes in the middle of the
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* extent have changed
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*/
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__le64 offset;
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/*
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* the logical number of file blocks (no csums included)
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*/
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__le64 num_blocks;
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} __attribute__ ((__packed__));
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struct btrfs_inode_map_item {
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struct btrfs_disk_key key;
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} __attribute__ ((__packed__));
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struct btrfs_fs_info {
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struct btrfs_root *fs_root;
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struct btrfs_root *extent_root;
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struct btrfs_root *tree_root;
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struct btrfs_root *inode_root;
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struct btrfs_key current_insert;
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struct btrfs_key last_insert;
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struct radix_tree_root cache_radix;
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struct radix_tree_root pinned_radix;
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struct list_head trans;
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struct list_head cache;
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u64 last_inode_alloc;
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u64 last_inode_alloc_dirid;
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int cache_size;
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int fp;
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struct btrfs_trans_handle *running_transaction;
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};
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/*
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@@ -188,21 +232,12 @@ struct btrfs_root_item {
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struct btrfs_root {
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struct btrfs_buffer *node;
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struct btrfs_buffer *commit_root;
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struct btrfs_root *extent_root;
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struct btrfs_root *tree_root;
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struct btrfs_key current_insert;
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struct btrfs_key last_insert;
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int fp;
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struct radix_tree_root cache_radix;
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struct radix_tree_root pinned_radix;
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struct list_head trans;
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struct list_head cache;
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int cache_size;
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int ref_cows;
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struct btrfs_root_item root_item;
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struct btrfs_key root_key;
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struct btrfs_fs_info *fs_info;
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u32 blocksize;
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struct btrfs_trans_handle *running_transaction;
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int ref_cows;
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u32 type;
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};
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/* the lower bits in the key flags defines the item type */
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@@ -240,11 +275,17 @@ struct btrfs_root {
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* are used, and how many references there are to each block
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*/
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#define BTRFS_EXTENT_ITEM_KEY 6
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/*
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* the inode map records which inode numbers are in use and where
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* they actually live on disk
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*/
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#define BTRFS_INODE_MAP_ITEM_KEY 7
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/*
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* string items are for debugging. They just store a short string of
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* data in the FS
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*/
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#define BTRFS_STRING_ITEM_KEY 7
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#define BTRFS_STRING_ITEM_KEY 8
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static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
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{
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@@ -654,6 +695,57 @@ static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
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{
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return (u8 *)l->items;
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}
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static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
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*e)
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{
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return le64_to_cpu(e->disk_blocknr);
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}
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static inline void btrfs_set_file_extent_disk_blocknr(struct
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btrfs_file_extent_item
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*e, u64 val)
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{
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e->disk_blocknr = cpu_to_le64(val);
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}
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static inline u64 btrfs_file_extent_disk_num_blocks(struct
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btrfs_file_extent_item *e)
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{
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return le64_to_cpu(e->disk_num_blocks);
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}
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static inline void btrfs_set_file_extent_disk_num_blocks(struct
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btrfs_file_extent_item
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*e, u64 val)
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{
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e->disk_num_blocks = cpu_to_le64(val);
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}
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static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
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{
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return le64_to_cpu(e->offset);
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}
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static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
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*e, u64 val)
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{
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e->offset = cpu_to_le64(val);
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}
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static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
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*e)
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{
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return le64_to_cpu(e->num_blocks);
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}
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static inline void btrfs_set_file_extent_num_blocks(struct
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btrfs_file_extent_item *e,
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u64 val)
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{
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e->num_blocks = cpu_to_le64(val);
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}
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/* helper function to cast into the data area of the leaf. */
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#define btrfs_item_ptr(leaf, slot, type) \
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((type *)(btrfs_leaf_data(leaf) + \
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@@ -701,4 +793,13 @@ int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
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int name_len, int mod);
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int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
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char *name, int name_len);
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int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
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struct btrfs_root *fs_root,
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u64 dirid, u64 *objectid);
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int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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u64 objectid, struct btrfs_key *location);
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int btrfs_lookup_inode_map(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, struct btrfs_path *path,
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u64 objectid, int mod);
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#endif
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