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Diffstat (limited to 'fs/btrfs/delayed-inode.h')
| -rw-r--r-- | fs/btrfs/delayed-inode.h | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/fs/btrfs/delayed-inode.h b/fs/btrfs/delayed-inode.h new file mode 100644 index 0000000000..1da213197f --- /dev/null +++ b/fs/btrfs/delayed-inode.h @@ -0,0 +1,177 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2011 Fujitsu. All rights reserved. + * Written by Miao Xie <miaox@cn.fujitsu.com> + */ + +#ifndef BTRFS_DELAYED_INODE_H +#define BTRFS_DELAYED_INODE_H + +#include <linux/rbtree.h> +#include <linux/spinlock.h> +#include <linux/mutex.h> +#include <linux/list.h> +#include <linux/wait.h> +#include <linux/atomic.h> +#include <linux/refcount.h> +#include "ctree.h" + +enum btrfs_delayed_item_type { + BTRFS_DELAYED_INSERTION_ITEM, + BTRFS_DELAYED_DELETION_ITEM +}; + +struct btrfs_delayed_root { + spinlock_t lock; + struct list_head node_list; + /* + * Used for delayed nodes which is waiting to be dealt with by the + * worker. If the delayed node is inserted into the work queue, we + * drop it from this list. + */ + struct list_head prepare_list; + atomic_t items; /* for delayed items */ + atomic_t items_seq; /* for delayed items */ + int nodes; /* for delayed nodes */ + wait_queue_head_t wait; +}; + +#define BTRFS_DELAYED_NODE_IN_LIST 0 +#define BTRFS_DELAYED_NODE_INODE_DIRTY 1 +#define BTRFS_DELAYED_NODE_DEL_IREF 2 + +struct btrfs_delayed_node { + u64 inode_id; + u64 bytes_reserved; + struct btrfs_root *root; + /* Used to add the node into the delayed root's node list. */ + struct list_head n_list; + /* + * Used to add the node into the prepare list, the nodes in this list + * is waiting to be dealt with by the async worker. + */ + struct list_head p_list; + struct rb_root_cached ins_root; + struct rb_root_cached del_root; + struct mutex mutex; + struct btrfs_inode_item inode_item; + refcount_t refs; + u64 index_cnt; + unsigned long flags; + int count; + /* + * The size of the next batch of dir index items to insert (if this + * node is from a directory inode). Protected by @mutex. + */ + u32 curr_index_batch_size; + /* + * Number of leaves reserved for inserting dir index items (if this + * node belongs to a directory inode). This may be larger then the + * actual number of leaves we end up using. Protected by @mutex. + */ + u32 index_item_leaves; +}; + +struct btrfs_delayed_item { + struct rb_node rb_node; + /* Offset value of the corresponding dir index key. */ + u64 index; + struct list_head tree_list; /* used for batch insert/delete items */ + struct list_head readdir_list; /* used for readdir items */ + /* + * Used when logging a directory. + * Insertions and deletions to this list are protected by the parent + * delayed node's mutex. + */ + struct list_head log_list; + u64 bytes_reserved; + struct btrfs_delayed_node *delayed_node; + refcount_t refs; + enum btrfs_delayed_item_type type:8; + /* + * Track if this delayed item was already logged. + * Protected by the mutex of the parent delayed inode. + */ + bool logged; + /* The maximum leaf size is 64K, so u16 is more than enough. */ + u16 data_len; + char data[] __counted_by(data_len); +}; + +static inline void btrfs_init_delayed_root( + struct btrfs_delayed_root *delayed_root) +{ + atomic_set(&delayed_root->items, 0); + atomic_set(&delayed_root->items_seq, 0); + delayed_root->nodes = 0; + spin_lock_init(&delayed_root->lock); + init_waitqueue_head(&delayed_root->wait); + INIT_LIST_HEAD(&delayed_root->node_list); + INIT_LIST_HEAD(&delayed_root->prepare_list); +} + +int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans, + const char *name, int name_len, + struct btrfs_inode *dir, + struct btrfs_disk_key *disk_key, u8 flags, + u64 index); + +int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans, + struct btrfs_inode *dir, u64 index); + +int btrfs_inode_delayed_dir_index_count(struct btrfs_inode *inode); + +int btrfs_run_delayed_items(struct btrfs_trans_handle *trans); +int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans, int nr); + +void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info); + +int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans, + struct btrfs_inode *inode); +/* Used for evicting the inode. */ +void btrfs_remove_delayed_node(struct btrfs_inode *inode); +void btrfs_kill_delayed_inode_items(struct btrfs_inode *inode); +int btrfs_commit_inode_delayed_inode(struct btrfs_inode *inode); + + +int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_inode *inode); +int btrfs_fill_inode(struct inode *inode, u32 *rdev); +int btrfs_delayed_delete_inode_ref(struct btrfs_inode *inode); + +/* Used for drop dead root */ +void btrfs_kill_all_delayed_nodes(struct btrfs_root *root); + +/* Used for clean the transaction */ +void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info); + +/* Used for readdir() */ +bool btrfs_readdir_get_delayed_items(struct inode *inode, + u64 last_index, + struct list_head *ins_list, + struct list_head *del_list); +void btrfs_readdir_put_delayed_items(struct inode *inode, + struct list_head *ins_list, + struct list_head *del_list); +int btrfs_should_delete_dir_index(struct list_head *del_list, + u64 index); +int btrfs_readdir_delayed_dir_index(struct dir_context *ctx, + struct list_head *ins_list); + +/* Used during directory logging. */ +void btrfs_log_get_delayed_items(struct btrfs_inode *inode, + struct list_head *ins_list, + struct list_head *del_list); +void btrfs_log_put_delayed_items(struct btrfs_inode *inode, + struct list_head *ins_list, + struct list_head *del_list); + +/* for init */ +int __init btrfs_delayed_inode_init(void); +void __cold btrfs_delayed_inode_exit(void); + +/* for debugging */ +void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info); + +#endif |