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EDIT: file_contexts_priv.h
/** @file file_contexts_priv.h @brief Store the opened file contexts(inode + pid), private struct definitions @details Copyright (c) 2024 Acronis International GmbH @author Bruce Wang (bruce.wang@acronis.com) @since $Id: $ */ #include <linux/list.h> #include <linux/rcupdate.h> #include <linux/spinlock.h> #include <linux/types.h> #include <linux/version.h> #include <linux/rbtree.h> #include "file_contexts.h" #include "hashtable_compat.h" #include "transport.h" #define FILE_CONTEXT_SMALL_TABLE_SIZE_BITS 6 // 64 #define FILE_CONTEXT_SMALL_TABLE_MAX_SIZE (1 << (FILE_CONTEXT_SMALL_TABLE_SIZE_BITS - 1)) // 32 #define FILE_CONTEXT_SMALL_TABLE_LRU_CLEAN_SIZE (10) #define FILE_CONTEXT_BIG_TABLE_SIZE_BITS 15 // 32768 #define FILE_CONTEXT_BIG_TBALE_SIZE (1 << (FILE_CONTEXT_BIG_TABLE_SIZE_BITS - 1)) // 16384 #define FILE_CONTEXT_BIG_TABLE_LRU_CLEAN_SIZE (100) #define FILE_CONTEXT_EXPIRE_TIME_MS (180 * 1000) #define FILE_CONTEXT_CHUNK_SIZE 4096 #define FILE_CONTEXT_CHUNK_LOWER_BOUND(N) ((uint64_t)(N / FILE_CONTEXT_CHUNK_SIZE) * FILE_CONTEXT_CHUNK_SIZE) #define FILE_CONTEXT_CHUNK_UPPER_BOUND(N) ((uint64_t)((N + FILE_CONTEXT_CHUNK_SIZE - 1) / FILE_CONTEXT_CHUNK_SIZE) * FILE_CONTEXT_CHUNK_SIZE) #define FILE_CONTEXT_MAX_FILE_SIZE (100 * 1024 * 1024) /* size of file_context_tables_t: 786576 Bytes => 0.75MB size of interval_node_t: 72 Bytes size of file_context_rw_node_t: 192 Bytes size of file_context_open_file_node_t: 720 Bytes size of file_context_open_process_node_t: 104 Bytes In the scenario that all tables are full: 2 *32768 * (sizeof(file_context_rw_node_t) + 32(estimated) * sizeof(interval_node_t)) + 32768 * (sizeof(file_context_open_file_node_t) + 32 * sizeof(file_context_open_process_node_t)) + sizeof(file_context_tables_t) = 283 MB */ // Node in file_context_common_table_t // this struct should always be the first in the assembled struct typedef struct { // node in file_context_common_table_t->hashtable struct hlist_node hash_node; uint64_t key; // node in file_context_common_table_t->lru_list bool lru_list_node_inserted; struct list_head lru_list_node; // node in temporary delete list struct list_head del_list_node; unsigned long last_access_time; atomic_t ref_count; struct rcu_head rcu; void (*pre_free_func)(void *); } file_context_common_node_t; // Abstruction of tables typedef struct { struct hlist_head *hashtable; struct list_head lru_list; unsigned int size; uint8_t hashbits; unsigned int max_size; unsigned short clean_count; spinlock_t spinlock; } file_context_common_table_t; // A small hashtable struct to store file_context_open_process_node_t, the key is pid typedef struct { DECLARE_HASHTABLE(hashtable, FILE_CONTEXT_SMALL_TABLE_SIZE_BITS); file_context_common_table_t common_table; } file_context_small_table_t; // A big hashtable struct to store file_context_open_file_node_t, file_context_rw_node_t, the key is inode ptr typedef struct { DECLARE_HASHTABLE(hashtable, FILE_CONTEXT_BIG_TABLE_SIZE_BITS); file_context_common_table_t common_table; } file_context_big_table_t; // A dummy struct for abstruction typedef struct { file_context_common_node_t common_node; } dummy_node_t; // Node in process_table typedef struct { file_context_common_node_t common_node; file_context_open_process_t data; } file_context_open_process_node_t; // Node in open_table typedef struct { file_context_common_node_t common_node; // Key: pid, Value: flags file_context_small_table_t process_table; file_context_key_t key; file_context_open_file_t data; } file_context_open_file_node_t; typedef struct { uint64_t low; uint64_t high; struct rb_node rb; // node in temporary delete list struct list_head del_list_node; struct list_head stack_node; } interval_node_t; // Node in read_table/write_table typedef struct { file_context_common_node_t common_node; // data fields file_context_key_t key; file_context_rw_t data; } file_context_rw_node_t; typedef struct { file_context_common_node_t common_node; file_context_process_t data; } file_context_process_node_t; typedef struct { file_context_common_node_t common_node; // data fields file_context_key_t key; file_context_small_table_t process_table; } file_context_file_modify_node_t; typedef struct { uint64_t transport_id; // TODO: ref_count is excessive, it is going to be used very rarely in a normal run // A better idea would be using rcu to acquire the file_context_tables_t pointer // and avoid using reference counts altogether atomic_t ref_count; // Key: inode.ptr, Value: processes file_context_big_table_t open_table; // Key: inode.ptr, Value: intervals file_context_big_table_t read_table; // Key: inode.ptr, Value: intervals file_context_big_table_t write_table; struct rcu_head rcu; } file_context_tables_t; #define MAX_TRANSPORT_EXTENDED_SIZE MAX_TRANSPORT_SIZE + 1 typedef struct { spinlock_t writer_lock; // file_context_tables_t is memory costly, malloc it only when new transport is opened // file_context_tables_t pointer is RCU protected // this is a quick fix, tables[MAX_TRANSPORT_SIZE] is used for file modified flag cache. // TODO: reorganize the tables file_context_tables_t *tables[MAX_TRANSPORT_EXTENDED_SIZE]; } file_context_manager_t;