/* * bmap.h - NILFS block mapping. * * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * Written by Koji Sato . */ #ifndef _NILFS_BMAP_H #define _NILFS_BMAP_H #include #include #include #include #include "alloc.h" #define NILFS_BMAP_INVALID_PTR 0 #define nilfs_bmap_dkey_to_key(dkey) le64_to_cpu(dkey) #define nilfs_bmap_key_to_dkey(key) cpu_to_le64(key) #define nilfs_bmap_dptr_to_ptr(dptr) le64_to_cpu(dptr) #define nilfs_bmap_ptr_to_dptr(ptr) cpu_to_le64(ptr) #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 */ struct nilfs_bmap_operations { int (*bop_lookup)(const struct nilfs_bmap *, __u64, int, __u64 *); int (*bop_insert)(struct nilfs_bmap *, __u64, __u64); int (*bop_delete)(struct nilfs_bmap *, __u64); void (*bop_clear)(struct nilfs_bmap *); int (*bop_propagate)(const 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); /* The following functions are internal use only. */ int (*bop_last_key)(const struct nilfs_bmap *, __u64 *); 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); }; /** * struct nilfs_bmap_ptr_operations - bmap ptr operation table */ struct nilfs_bmap_ptr_operations { int (*bpop_prepare_alloc_ptr)(struct nilfs_bmap *, union nilfs_bmap_ptr_req *); void (*bpop_commit_alloc_ptr)(struct nilfs_bmap *, union nilfs_bmap_ptr_req *); void (*bpop_abort_alloc_ptr)(struct nilfs_bmap *, union nilfs_bmap_ptr_req *); int (*bpop_prepare_start_ptr)(struct nilfs_bmap *, union nilfs_bmap_ptr_req *); void (*bpop_commit_start_ptr)(struct nilfs_bmap *, union nilfs_bmap_ptr_req *, sector_t); void (*bpop_abort_start_ptr)(struct nilfs_bmap *, union nilfs_bmap_ptr_req *); int (*bpop_prepare_end_ptr)(struct nilfs_bmap *, union nilfs_bmap_ptr_req *); void (*bpop_commit_end_ptr)(struct nilfs_bmap *, union nilfs_bmap_ptr_req *); void (*bpop_abort_end_ptr)(struct nilfs_bmap *, union nilfs_bmap_ptr_req *); int (*bpop_translate)(const struct nilfs_bmap *, __u64, __u64 *); }; #define NILFS_BMAP_SIZE (NILFS_INODE_BMAP_SIZE * sizeof(__le64)) #define NILFS_BMAP_KEY_BIT (sizeof(unsigned long) * 8 /* CHAR_BIT */) #define NILFS_BMAP_NEW_PTR_INIT \ (1UL << (sizeof(unsigned long) * 8 /* CHAR_BIT */ - 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_pops: bmap ptr operation table * @b_low: low watermark of conversion * @b_high: high watermark of conversion * @b_last_allocated_key: last allocated key for data block * @b_last_allocated_ptr: last allocated ptr for data block * @b_state: state */ 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; const struct nilfs_bmap_ptr_operations *b_pops; __u64 b_low; __u64 b_high; __u64 b_last_allocated_key; __u64 b_last_allocated_ptr; int b_state; }; /* state */ #define NILFS_BMAP_DIRTY 0x00000001 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(struct nilfs_bmap *, unsigned long, unsigned long *); int nilfs_bmap_insert(struct nilfs_bmap *, unsigned long, unsigned long); int nilfs_bmap_delete(struct nilfs_bmap *, unsigned long); int nilfs_bmap_last_key(struct nilfs_bmap *, unsigned long *); int nilfs_bmap_truncate(struct nilfs_bmap *, unsigned long); 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_init_gcdat(struct nilfs_bmap *, struct nilfs_bmap *); void nilfs_bmap_commit_gcdat(struct nilfs_bmap *, struct nilfs_bmap *); /* * Internal use only */ int nilfs_bmap_move_v(const struct nilfs_bmap *, __u64, sector_t); int nilfs_bmap_mark_dirty(const struct nilfs_bmap *, __u64); __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 *); int nilfs_bmap_prepare_update(struct nilfs_bmap *, union nilfs_bmap_ptr_req *, union nilfs_bmap_ptr_req *); void nilfs_bmap_commit_update(struct nilfs_bmap *, union nilfs_bmap_ptr_req *, union nilfs_bmap_ptr_req *); void nilfs_bmap_abort_update(struct nilfs_bmap *, union nilfs_bmap_ptr_req *, union nilfs_bmap_ptr_req *); void nilfs_bmap_add_blocks(const struct nilfs_bmap *, int); void nilfs_bmap_sub_blocks(const struct nilfs_bmap *, int); int nilfs_bmap_get_block(const struct nilfs_bmap *, __u64, struct buffer_head **); void nilfs_bmap_put_block(const struct nilfs_bmap *, struct buffer_head *); int nilfs_bmap_get_new_block(const struct nilfs_bmap *, __u64, struct buffer_head **); void nilfs_bmap_delete_block(const struct nilfs_bmap *, struct buffer_head *); /* 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 */