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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#ifndef _NILFS_BMAP_H#define _NILFS_BMAP_H
#include <linux/types.h>#include <linux/fs.h>#include <linux/buffer_head.h>#include <linux/nilfs2_ondisk.h> /* nilfs_binfo, nilfs_inode, etc */#include "alloc.h"#include "dat.h"
#define NILFS_BMAP_INVALID_PTR 0
#define nilfs_bmap_keydiff_abs(diff) ((diff) < 0 ? -(diff) : (diff))
struct nilfs_bmap;
/** * union nilfs_bmap_ptr_req - request for bmap ptr * @bpr_ptr: bmap pointer * @bpr_req: request for persistent allocator */union nilfs_bmap_ptr_req { __u64 bpr_ptr; struct nilfs_palloc_req bpr_req;};
/** * struct nilfs_bmap_stats - bmap statistics * @bs_nblocks: number of blocks created or deleted */struct nilfs_bmap_stats { unsigned int bs_nblocks;};
/** * struct nilfs_bmap_operations - bmap operation table * @bop_lookup: single block search operation * @bop_lookup_contig: consecutive block search operation * @bop_insert: block insertion operation * @bop_delete: block delete operation * @bop_clear: block mapping resource release operation * @bop_propagate: operation to propagate dirty state towards the * mapping root * @bop_lookup_dirty_buffers: operation to collect dirty block buffers * @bop_assign: disk block address assignment operation * @bop_mark: operation to mark in-use blocks as dirty for * relocation by GC * @bop_seek_key: find valid block key operation * @bop_last_key: find last valid block key operation */struct nilfs_bmap_operations { int (*bop_lookup)(const struct nilfs_bmap *, __u64, int, __u64 *); int (*bop_lookup_contig)(const struct nilfs_bmap *, __u64, __u64 *, unsigned int); int (*bop_insert)(struct nilfs_bmap *, __u64, __u64); int (*bop_delete)(struct nilfs_bmap *bmap, __u64 key, bool deform); void (*bop_clear)(struct nilfs_bmap *);
int (*bop_propagate)(struct nilfs_bmap *, struct buffer_head *); void (*bop_lookup_dirty_buffers)(struct nilfs_bmap *, struct list_head *);
int (*bop_assign)(struct nilfs_bmap *, struct buffer_head **, sector_t, union nilfs_binfo *); int (*bop_mark)(struct nilfs_bmap *, __u64, int);
int (*bop_seek_key)(const struct nilfs_bmap *, __u64, __u64 *); int (*bop_last_key)(const struct nilfs_bmap *, __u64 *);
/* private: internal use only */ int (*bop_check_insert)(const struct nilfs_bmap *, __u64); int (*bop_check_delete)(struct nilfs_bmap *, __u64); int (*bop_gather_data)(struct nilfs_bmap *, __u64 *, __u64 *, int);};
#define NILFS_BMAP_SIZE (NILFS_INODE_BMAP_SIZE * sizeof(__le64))#define NILFS_BMAP_KEY_BIT BITS_PER_LONG#define NILFS_BMAP_NEW_PTR_INIT (1UL << (BITS_PER_LONG - 1))
static inline int nilfs_bmap_is_new_ptr(unsigned long ptr){ return !!(ptr & NILFS_BMAP_NEW_PTR_INIT);}
/** * struct nilfs_bmap - bmap structure * @b_u: raw data * @b_sem: semaphore * @b_inode: owner of bmap * @b_ops: bmap operation table * @b_last_allocated_key: last allocated key for data block * @b_last_allocated_ptr: last allocated ptr for data block * @b_ptr_type: pointer type * @b_state: state * @b_nchildren_per_block: maximum number of child nodes for non-root nodes */struct nilfs_bmap { union { __u8 u_flags; __le64 u_data[NILFS_BMAP_SIZE / sizeof(__le64)]; } b_u; struct rw_semaphore b_sem; struct inode *b_inode; const struct nilfs_bmap_operations *b_ops; __u64 b_last_allocated_key; __u64 b_last_allocated_ptr; int b_ptr_type; int b_state; __u16 b_nchildren_per_block;};
/* pointer type */#define NILFS_BMAP_PTR_P 0 /* physical block number (i.e. LBN) */#define NILFS_BMAP_PTR_VS 1 /* * virtual block number (single * version) */#define NILFS_BMAP_PTR_VM 2 /* * virtual block number (has multiple * versions) */#define NILFS_BMAP_PTR_U (-1) /* never perform pointer operations */
#define NILFS_BMAP_USE_VBN(bmap) ((bmap)->b_ptr_type > 0)
/* state */#define NILFS_BMAP_DIRTY 0x00000001
/** * struct nilfs_bmap_store - shadow copy of bmap state * @data: cached raw block mapping of on-disk inode * @last_allocated_key: cached value of last allocated key for data block * @last_allocated_ptr: cached value of last allocated ptr for data block * @state: cached value of state field of bmap structure */struct nilfs_bmap_store { __le64 data[NILFS_BMAP_SIZE / sizeof(__le64)]; __u64 last_allocated_key; __u64 last_allocated_ptr; int state;};
int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *);int nilfs_bmap_read(struct nilfs_bmap *, struct nilfs_inode *);void nilfs_bmap_write(struct nilfs_bmap *, struct nilfs_inode *);int nilfs_bmap_lookup_contig(struct nilfs_bmap *, __u64, __u64 *, unsigned int);int nilfs_bmap_insert(struct nilfs_bmap *bmap, __u64 key, unsigned long rec);int nilfs_bmap_delete(struct nilfs_bmap *bmap, __u64 key);int nilfs_bmap_seek_key(struct nilfs_bmap *bmap, __u64 start, __u64 *keyp);int nilfs_bmap_last_key(struct nilfs_bmap *bmap, __u64 *keyp);int nilfs_bmap_truncate(struct nilfs_bmap *bmap, __u64 key);void nilfs_bmap_clear(struct nilfs_bmap *);int nilfs_bmap_propagate(struct nilfs_bmap *, struct buffer_head *);void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *, struct list_head *);int nilfs_bmap_assign(struct nilfs_bmap *, struct buffer_head **, unsigned long, union nilfs_binfo *);int nilfs_bmap_lookup_at_level(struct nilfs_bmap *, __u64, int, __u64 *);int nilfs_bmap_mark(struct nilfs_bmap *, __u64, int);
void nilfs_bmap_init_gc(struct nilfs_bmap *);
void nilfs_bmap_save(const struct nilfs_bmap *, struct nilfs_bmap_store *);void nilfs_bmap_restore(struct nilfs_bmap *, const struct nilfs_bmap_store *);
static inline int nilfs_bmap_lookup(struct nilfs_bmap *bmap, __u64 key, __u64 *ptr){ return nilfs_bmap_lookup_at_level(bmap, key, 1, ptr);}
/* * Internal use only */struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *);
static inline int nilfs_bmap_prepare_alloc_ptr(struct nilfs_bmap *bmap, union nilfs_bmap_ptr_req *req, struct inode *dat){ if (dat) return nilfs_dat_prepare_alloc(dat, &req->bpr_req); /* ignore target ptr */ req->bpr_ptr = bmap->b_last_allocated_ptr++; return 0;}
static inline void nilfs_bmap_commit_alloc_ptr(struct nilfs_bmap *bmap, union nilfs_bmap_ptr_req *req, struct inode *dat){ if (dat) nilfs_dat_commit_alloc(dat, &req->bpr_req);}
static inline void nilfs_bmap_abort_alloc_ptr(struct nilfs_bmap *bmap, union nilfs_bmap_ptr_req *req, struct inode *dat){ if (dat) nilfs_dat_abort_alloc(dat, &req->bpr_req); else bmap->b_last_allocated_ptr--;}
static inline int nilfs_bmap_prepare_end_ptr(struct nilfs_bmap *bmap, union nilfs_bmap_ptr_req *req, struct inode *dat){ return dat ? nilfs_dat_prepare_end(dat, &req->bpr_req) : 0;}
static inline void nilfs_bmap_commit_end_ptr(struct nilfs_bmap *bmap, union nilfs_bmap_ptr_req *req, struct inode *dat){ if (dat) nilfs_dat_commit_end(dat, &req->bpr_req, bmap->b_ptr_type == NILFS_BMAP_PTR_VS);}
static inline void nilfs_bmap_abort_end_ptr(struct nilfs_bmap *bmap, union nilfs_bmap_ptr_req *req, struct inode *dat){ if (dat) nilfs_dat_abort_end(dat, &req->bpr_req);}
static inline void nilfs_bmap_set_target_v(struct nilfs_bmap *bmap, __u64 key, __u64 ptr){ bmap->b_last_allocated_key = key; bmap->b_last_allocated_ptr = ptr;}
__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *, const struct buffer_head *);
__u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *, __u64);__u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *);
/* Assume that bmap semaphore is locked. */static inline int nilfs_bmap_dirty(const struct nilfs_bmap *bmap){ return !!(bmap->b_state & NILFS_BMAP_DIRTY);}
/* Assume that bmap semaphore is locked. */static inline void nilfs_bmap_set_dirty(struct nilfs_bmap *bmap){ bmap->b_state |= NILFS_BMAP_DIRTY;}
/* Assume that bmap semaphore is locked. */static inline void nilfs_bmap_clear_dirty(struct nilfs_bmap *bmap){ bmap->b_state &= ~NILFS_BMAP_DIRTY;}
#define NILFS_BMAP_LARGE 0x1
#define NILFS_BMAP_SMALL_LOW NILFS_DIRECT_KEY_MIN#define NILFS_BMAP_SMALL_HIGH NILFS_DIRECT_KEY_MAX#define NILFS_BMAP_LARGE_LOW NILFS_BTREE_ROOT_NCHILDREN_MAX#define NILFS_BMAP_LARGE_HIGH NILFS_BTREE_KEY_MAX
#endif /* _NILFS_BMAP_H */