1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * mdt.h - NILFS meta data file prototype and definitions 4 * 5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. 6 * 7 * Written by Ryusuke Konishi. 8 */ 9 10 #ifndef _NILFS_MDT_H 11 #define _NILFS_MDT_H 12 13 #include <linux/buffer_head.h> 14 #include <linux/blockgroup_lock.h> 15 #include "nilfs.h" 16 #include "page.h" 17 18 /** 19 * struct nilfs_shadow_map - shadow mapping of meta data file 20 * @bmap_store: shadow copy of bmap state 21 * @frozen_data: shadowed dirty data pages 22 * @frozen_btnodes: shadowed dirty b-tree nodes' pages 23 * @frozen_buffers: list of frozen buffers 24 */ 25 struct nilfs_shadow_map { 26 struct nilfs_bmap_store bmap_store; 27 struct address_space frozen_data; 28 struct address_space frozen_btnodes; 29 struct list_head frozen_buffers; 30 }; 31 32 /** 33 * struct nilfs_mdt_info - on-memory private data of meta data files 34 * @mi_sem: reader/writer semaphore for meta data operations 35 * @mi_bgl: per-blockgroup locking 36 * @mi_entry_size: size of an entry 37 * @mi_first_entry_offset: offset to the first entry 38 * @mi_entries_per_block: number of entries in a block 39 * @mi_palloc_cache: persistent object allocator cache 40 * @mi_shadow: shadow of bmap and page caches 41 * @mi_blocks_per_group: number of blocks in a group 42 * @mi_blocks_per_desc_block: number of blocks per descriptor block 43 */ 44 struct nilfs_mdt_info { 45 struct rw_semaphore mi_sem; 46 struct blockgroup_lock *mi_bgl; 47 unsigned int mi_entry_size; 48 unsigned int mi_first_entry_offset; 49 unsigned long mi_entries_per_block; 50 struct nilfs_palloc_cache *mi_palloc_cache; 51 struct nilfs_shadow_map *mi_shadow; 52 unsigned long mi_blocks_per_group; 53 unsigned long mi_blocks_per_desc_block; 54 }; 55 56 static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode) 57 { 58 return inode->i_private; 59 } 60 61 static inline int nilfs_is_metadata_file_inode(const struct inode *inode) 62 { 63 return inode->i_private != NULL; 64 } 65 66 /* Default GFP flags using highmem */ 67 #define NILFS_MDT_GFP (__GFP_RECLAIM | __GFP_IO | __GFP_HIGHMEM) 68 69 int nilfs_mdt_get_block(struct inode *, unsigned long, int, 70 void (*init_block)(struct inode *, 71 struct buffer_head *, void *), 72 struct buffer_head **); 73 int nilfs_mdt_find_block(struct inode *inode, unsigned long start, 74 unsigned long end, unsigned long *blkoff, 75 struct buffer_head **out_bh); 76 int nilfs_mdt_delete_block(struct inode *, unsigned long); 77 int nilfs_mdt_forget_block(struct inode *, unsigned long); 78 int nilfs_mdt_fetch_dirty(struct inode *); 79 80 int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz); 81 void nilfs_mdt_clear(struct inode *inode); 82 void nilfs_mdt_destroy(struct inode *inode); 83 84 void nilfs_mdt_set_entry_size(struct inode *, unsigned int, unsigned int); 85 86 int nilfs_mdt_setup_shadow_map(struct inode *inode, 87 struct nilfs_shadow_map *shadow); 88 int nilfs_mdt_save_to_shadow_map(struct inode *inode); 89 void nilfs_mdt_restore_from_shadow_map(struct inode *inode); 90 void nilfs_mdt_clear_shadow_map(struct inode *inode); 91 int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh); 92 struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode, 93 struct buffer_head *bh); 94 95 static inline void nilfs_mdt_mark_dirty(struct inode *inode) 96 { 97 if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state)) 98 set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); 99 } 100 101 static inline void nilfs_mdt_clear_dirty(struct inode *inode) 102 { 103 clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); 104 } 105 106 static inline __u64 nilfs_mdt_cno(struct inode *inode) 107 { 108 return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno; 109 } 110 111 static inline spinlock_t * 112 nilfs_mdt_bgl_lock(struct inode *inode, unsigned int block_group) 113 { 114 return bgl_lock_ptr(NILFS_MDT(inode)->mi_bgl, block_group); 115 } 116 117 #endif /* _NILFS_MDT_H */ 118