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271 lines
7.8 KiB
271 lines
7.8 KiB
/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* |
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* bmap.h - NILFS block mapping. |
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* |
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* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. |
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* |
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* Written by Koji Sato. |
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*/ |
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#ifndef _NILFS_BMAP_H |
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#define _NILFS_BMAP_H |
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#include <linux/types.h> |
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#include <linux/fs.h> |
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#include <linux/buffer_head.h> |
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#include <linux/nilfs2_ondisk.h> /* nilfs_binfo, nilfs_inode, etc */ |
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#include "alloc.h" |
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#include "dat.h" |
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#define NILFS_BMAP_INVALID_PTR 0 |
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#define nilfs_bmap_keydiff_abs(diff) ((diff) < 0 ? -(diff) : (diff)) |
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struct nilfs_bmap; |
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/** |
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* union nilfs_bmap_ptr_req - request for bmap ptr |
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* @bpr_ptr: bmap pointer |
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* @bpr_req: request for persistent allocator |
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*/ |
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union nilfs_bmap_ptr_req { |
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__u64 bpr_ptr; |
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struct nilfs_palloc_req bpr_req; |
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}; |
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/** |
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* struct nilfs_bmap_stats - bmap statistics |
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* @bs_nblocks: number of blocks created or deleted |
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*/ |
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struct nilfs_bmap_stats { |
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unsigned int bs_nblocks; |
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}; |
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/** |
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* struct nilfs_bmap_operations - bmap operation table |
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*/ |
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struct nilfs_bmap_operations { |
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int (*bop_lookup)(const struct nilfs_bmap *, __u64, int, __u64 *); |
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int (*bop_lookup_contig)(const struct nilfs_bmap *, __u64, __u64 *, |
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unsigned int); |
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int (*bop_insert)(struct nilfs_bmap *, __u64, __u64); |
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int (*bop_delete)(struct nilfs_bmap *, __u64); |
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void (*bop_clear)(struct nilfs_bmap *); |
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int (*bop_propagate)(struct nilfs_bmap *, struct buffer_head *); |
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void (*bop_lookup_dirty_buffers)(struct nilfs_bmap *, |
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struct list_head *); |
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int (*bop_assign)(struct nilfs_bmap *, |
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struct buffer_head **, |
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sector_t, |
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union nilfs_binfo *); |
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int (*bop_mark)(struct nilfs_bmap *, __u64, int); |
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int (*bop_seek_key)(const struct nilfs_bmap *, __u64, __u64 *); |
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int (*bop_last_key)(const struct nilfs_bmap *, __u64 *); |
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/* The following functions are internal use only. */ |
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int (*bop_check_insert)(const struct nilfs_bmap *, __u64); |
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int (*bop_check_delete)(struct nilfs_bmap *, __u64); |
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int (*bop_gather_data)(struct nilfs_bmap *, __u64 *, __u64 *, int); |
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}; |
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#define NILFS_BMAP_SIZE (NILFS_INODE_BMAP_SIZE * sizeof(__le64)) |
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#define NILFS_BMAP_KEY_BIT (sizeof(unsigned long) * 8 /* CHAR_BIT */) |
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#define NILFS_BMAP_NEW_PTR_INIT \ |
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(1UL << (sizeof(unsigned long) * 8 /* CHAR_BIT */ - 1)) |
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static inline int nilfs_bmap_is_new_ptr(unsigned long ptr) |
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{ |
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return !!(ptr & NILFS_BMAP_NEW_PTR_INIT); |
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} |
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/** |
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* struct nilfs_bmap - bmap structure |
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* @b_u: raw data |
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* @b_sem: semaphore |
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* @b_inode: owner of bmap |
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* @b_ops: bmap operation table |
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* @b_last_allocated_key: last allocated key for data block |
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* @b_last_allocated_ptr: last allocated ptr for data block |
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* @b_ptr_type: pointer type |
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* @b_state: state |
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* @b_nchildren_per_block: maximum number of child nodes for non-root nodes |
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*/ |
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struct nilfs_bmap { |
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union { |
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__u8 u_flags; |
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__le64 u_data[NILFS_BMAP_SIZE / sizeof(__le64)]; |
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} b_u; |
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struct rw_semaphore b_sem; |
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struct inode *b_inode; |
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const struct nilfs_bmap_operations *b_ops; |
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__u64 b_last_allocated_key; |
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__u64 b_last_allocated_ptr; |
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int b_ptr_type; |
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int b_state; |
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__u16 b_nchildren_per_block; |
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}; |
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/* pointer type */ |
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#define NILFS_BMAP_PTR_P 0 /* physical block number (i.e. LBN) */ |
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#define NILFS_BMAP_PTR_VS 1 /* |
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* virtual block number (single |
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* version) |
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*/ |
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#define NILFS_BMAP_PTR_VM 2 /* |
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* virtual block number (has multiple |
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* versions) |
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*/ |
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#define NILFS_BMAP_PTR_U (-1) /* never perform pointer operations */ |
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#define NILFS_BMAP_USE_VBN(bmap) ((bmap)->b_ptr_type > 0) |
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/* state */ |
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#define NILFS_BMAP_DIRTY 0x00000001 |
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/** |
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* struct nilfs_bmap_store - shadow copy of bmap state |
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* @data: cached raw block mapping of on-disk inode |
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* @last_allocated_key: cached value of last allocated key for data block |
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* @last_allocated_ptr: cached value of last allocated ptr for data block |
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* @state: cached value of state field of bmap structure |
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*/ |
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struct nilfs_bmap_store { |
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__le64 data[NILFS_BMAP_SIZE / sizeof(__le64)]; |
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__u64 last_allocated_key; |
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__u64 last_allocated_ptr; |
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int state; |
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}; |
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int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *); |
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int nilfs_bmap_read(struct nilfs_bmap *, struct nilfs_inode *); |
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void nilfs_bmap_write(struct nilfs_bmap *, struct nilfs_inode *); |
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int nilfs_bmap_lookup_contig(struct nilfs_bmap *, __u64, __u64 *, unsigned int); |
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int nilfs_bmap_insert(struct nilfs_bmap *bmap, __u64 key, unsigned long rec); |
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int nilfs_bmap_delete(struct nilfs_bmap *bmap, __u64 key); |
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int nilfs_bmap_seek_key(struct nilfs_bmap *bmap, __u64 start, __u64 *keyp); |
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int nilfs_bmap_last_key(struct nilfs_bmap *bmap, __u64 *keyp); |
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int nilfs_bmap_truncate(struct nilfs_bmap *bmap, __u64 key); |
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void nilfs_bmap_clear(struct nilfs_bmap *); |
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int nilfs_bmap_propagate(struct nilfs_bmap *, struct buffer_head *); |
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void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *, struct list_head *); |
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int nilfs_bmap_assign(struct nilfs_bmap *, struct buffer_head **, |
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unsigned long, union nilfs_binfo *); |
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int nilfs_bmap_lookup_at_level(struct nilfs_bmap *, __u64, int, __u64 *); |
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int nilfs_bmap_mark(struct nilfs_bmap *, __u64, int); |
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void nilfs_bmap_init_gc(struct nilfs_bmap *); |
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void nilfs_bmap_save(const struct nilfs_bmap *, struct nilfs_bmap_store *); |
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void nilfs_bmap_restore(struct nilfs_bmap *, const struct nilfs_bmap_store *); |
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static inline int nilfs_bmap_lookup(struct nilfs_bmap *bmap, __u64 key, |
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__u64 *ptr) |
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{ |
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return nilfs_bmap_lookup_at_level(bmap, key, 1, ptr); |
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} |
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/* |
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* Internal use only |
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*/ |
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struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *); |
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static inline int nilfs_bmap_prepare_alloc_ptr(struct nilfs_bmap *bmap, |
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union nilfs_bmap_ptr_req *req, |
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struct inode *dat) |
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{ |
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if (dat) |
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return nilfs_dat_prepare_alloc(dat, &req->bpr_req); |
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/* ignore target ptr */ |
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req->bpr_ptr = bmap->b_last_allocated_ptr++; |
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return 0; |
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} |
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static inline void nilfs_bmap_commit_alloc_ptr(struct nilfs_bmap *bmap, |
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union nilfs_bmap_ptr_req *req, |
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struct inode *dat) |
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{ |
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if (dat) |
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nilfs_dat_commit_alloc(dat, &req->bpr_req); |
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} |
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static inline void nilfs_bmap_abort_alloc_ptr(struct nilfs_bmap *bmap, |
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union nilfs_bmap_ptr_req *req, |
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struct inode *dat) |
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{ |
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if (dat) |
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nilfs_dat_abort_alloc(dat, &req->bpr_req); |
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else |
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bmap->b_last_allocated_ptr--; |
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} |
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static inline int nilfs_bmap_prepare_end_ptr(struct nilfs_bmap *bmap, |
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union nilfs_bmap_ptr_req *req, |
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struct inode *dat) |
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{ |
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return dat ? nilfs_dat_prepare_end(dat, &req->bpr_req) : 0; |
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} |
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static inline void nilfs_bmap_commit_end_ptr(struct nilfs_bmap *bmap, |
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union nilfs_bmap_ptr_req *req, |
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struct inode *dat) |
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{ |
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if (dat) |
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nilfs_dat_commit_end(dat, &req->bpr_req, |
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bmap->b_ptr_type == NILFS_BMAP_PTR_VS); |
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} |
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static inline void nilfs_bmap_abort_end_ptr(struct nilfs_bmap *bmap, |
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union nilfs_bmap_ptr_req *req, |
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struct inode *dat) |
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{ |
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if (dat) |
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nilfs_dat_abort_end(dat, &req->bpr_req); |
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} |
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static inline void nilfs_bmap_set_target_v(struct nilfs_bmap *bmap, __u64 key, |
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__u64 ptr) |
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{ |
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bmap->b_last_allocated_key = key; |
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bmap->b_last_allocated_ptr = ptr; |
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} |
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__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *, |
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const struct buffer_head *); |
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__u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *, __u64); |
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__u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *); |
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/* Assume that bmap semaphore is locked. */ |
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static inline int nilfs_bmap_dirty(const struct nilfs_bmap *bmap) |
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{ |
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return !!(bmap->b_state & NILFS_BMAP_DIRTY); |
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} |
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/* Assume that bmap semaphore is locked. */ |
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static inline void nilfs_bmap_set_dirty(struct nilfs_bmap *bmap) |
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{ |
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bmap->b_state |= NILFS_BMAP_DIRTY; |
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} |
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/* Assume that bmap semaphore is locked. */ |
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static inline void nilfs_bmap_clear_dirty(struct nilfs_bmap *bmap) |
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{ |
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bmap->b_state &= ~NILFS_BMAP_DIRTY; |
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} |
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#define NILFS_BMAP_LARGE 0x1 |
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#define NILFS_BMAP_SMALL_LOW NILFS_DIRECT_KEY_MIN |
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#define NILFS_BMAP_SMALL_HIGH NILFS_DIRECT_KEY_MAX |
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#define NILFS_BMAP_LARGE_LOW NILFS_BTREE_ROOT_NCHILDREN_MAX |
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#define NILFS_BMAP_LARGE_HIGH NILFS_BTREE_KEY_MAX |
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#endif /* _NILFS_BMAP_H */
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