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