Btrfs: early support for multiple devices
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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cac87faa09
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@ -13,10 +13,11 @@ extern struct kmem_cache *btrfs_path_cachep;
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#define BTRFS_MAGIC "_BtRfS_M"
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#define BTRFS_ROOT_TREE_OBJECTID 1ULL
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#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
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#define BTRFS_FS_TREE_OBJECTID 3ULL
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#define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
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#define BTRFS_FIRST_FREE_OBJECTID 5ULL
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#define BTRFS_DEV_TREE_OBJECTID 2ULL
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#define BTRFS_EXTENT_TREE_OBJECTID 3ULL
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#define BTRFS_FS_TREE_OBJECTID 4ULL
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#define BTRFS_ROOT_TREE_DIR_OBJECTID 5ULL
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#define BTRFS_FIRST_FREE_OBJECTID 6ULL
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/*
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* we can actually store much bigger names, but lets not confuse the rest
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@ -90,6 +91,10 @@ struct btrfs_super_block {
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__le64 total_blocks;
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__le64 blocks_used;
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__le64 root_dir_objectid;
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/* fields below here vary with the underlying disk */
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__le64 device_block_start;
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__le64 device_num_blocks;
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__le64 device_root;
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} __attribute__ ((__packed__));
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/*
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@ -223,10 +228,15 @@ struct btrfs_csum_item {
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u8 csum[BTRFS_CSUM_SIZE];
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} __attribute__ ((__packed__));
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struct btrfs_device_item {
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__le16 pathlen;
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} __attribute__ ((__packed__));
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struct crypto_hash;
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struct btrfs_fs_info {
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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 *dev_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 fs_roots_radix;
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@ -312,11 +322,16 @@ struct btrfs_root {
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*/
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#define BTRFS_EXTENT_ITEM_KEY 8
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/*
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* dev items list the devices that make up the FS
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*/
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#define BTRFS_DEV_ITEM_KEY 9
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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 9
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#define BTRFS_STRING_ITEM_KEY 10
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static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
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{
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@ -782,6 +797,40 @@ static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
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s->root_dir_objectid = cpu_to_le64(val);
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}
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static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
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{
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return le64_to_cpu(s->device_block_start);
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}
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static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
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*s, u64 val)
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{
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s->device_block_start = cpu_to_le64(val);
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}
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static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
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{
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return le64_to_cpu(s->device_num_blocks);
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}
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static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
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*s, u64 val)
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{
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s->device_num_blocks = cpu_to_le64(val);
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}
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static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
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{
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return le64_to_cpu(s->device_root);
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}
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static inline void btrfs_set_super_device_root(struct btrfs_super_block
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*s, u64 val)
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{
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s->device_root = cpu_to_le64(val);
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}
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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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@ -849,6 +898,17 @@ static inline void btrfs_set_file_extent_num_blocks(struct
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e->num_blocks = cpu_to_le64(val);
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}
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static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
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{
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return le16_to_cpu(d->pathlen);
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}
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static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
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u16 val)
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{
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d->pathlen = cpu_to_le16(val);
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}
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static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
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{
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return sb->s_fs_info;
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@ -378,6 +378,8 @@ struct btrfs_root *open_ctree(struct super_block *sb)
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{
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struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
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@ -392,6 +394,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
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fs_info->running_transaction = NULL;
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fs_info->tree_root = tree_root;
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fs_info->extent_root = extent_root;
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fs_info->dev_root = dev_root;
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fs_info->sb = sb;
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fs_info->btree_inode = new_inode(sb);
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fs_info->btree_inode->i_ino = 1;
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@ -414,6 +417,9 @@ struct btrfs_root *open_ctree(struct super_block *sb)
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memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert));
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memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert));
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__setup_root(sb->s_blocksize, dev_root,
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fs_info, BTRFS_DEV_TREE_OBJECTID);
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__setup_root(sb->s_blocksize, tree_root,
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fs_info, BTRFS_ROOT_TREE_OBJECTID);
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fs_info->sb_buffer = read_tree_block(tree_root,
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@ -427,6 +433,8 @@ struct btrfs_root *open_ctree(struct super_block *sb)
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return NULL;
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fs_info->disk_super = disk_super;
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dev_root->node = read_tree_block(tree_root,
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btrfs_super_device_root(disk_super));
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tree_root->node = read_tree_block(tree_root,
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btrfs_super_root(disk_super));
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BUG_ON(!tree_root->node);
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@ -519,6 +527,9 @@ int close_ctree(struct btrfs_root *root)
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if (fs_info->extent_root->node)
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btrfs_block_release(fs_info->extent_root,
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fs_info->extent_root->node);
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if (fs_info->dev_root->node)
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btrfs_block_release(fs_info->dev_root,
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fs_info->dev_root->node);
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if (fs_info->tree_root->node)
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btrfs_block_release(fs_info->tree_root,
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fs_info->tree_root->node);
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