reiserfs_fs_sb.h

linux得一些常用命令,以及linux环境下的c编程

  unsigned long j_last_flush_trans_id ;    /* last fully flushed journal timestamp */
  struct buffer_head *j_header_bh ;   

  /* j_flush_pages must be flushed before the current transaction can
  ** commit
  */
  struct reiserfs_page_list *j_flush_pages ;
  time_t j_trans_start_time ;         /* time this transaction started */
  wait_queue_head_t j_wait ;         /* wait  journal_end to finish I/O */
  atomic_t j_wlock ;                       /* lock for j_wait */
  wait_queue_head_t j_join_wait ;    /* wait for current transaction to finish before starting new one */
  atomic_t j_jlock ;                       /* lock for j_join_wait */
  int j_journal_list_index ;	      /* journal list number of the current trans */
  int j_list_bitmap_index ;	      /* number of next list bitmap to use */
  int j_must_wait ;		       /* no more journal begins allowed. MUST sleep on j_join_wait */
  int j_next_full_flush ;             /* next journal_end will flush all journal list */
  int j_next_async_flush ;             /* next journal_end will flush all async commits */

  int j_cnode_used ;	      /* number of cnodes on the used list */
  int j_cnode_free ;          /* number of cnodes on the free list */

  struct reiserfs_journal_cnode *j_cnode_free_list ;
  struct reiserfs_journal_cnode *j_cnode_free_orig ; /* orig pointer returned from vmalloc */

  int j_free_bitmap_nodes ;
  int j_used_bitmap_nodes ;
  struct list_head j_bitmap_nodes ;
  struct inode j_dummy_inode ;
  struct reiserfs_list_bitmap j_list_bitmap[JOURNAL_NUM_BITMAPS] ;	/* array of bitmaps to record the deleted blocks */
  struct reiserfs_journal_list j_journal_list[JOURNAL_LIST_COUNT] ;	    /* array of all the journal lists */
  struct reiserfs_journal_cnode *j_hash_table[JOURNAL_HASH_SIZE] ; 	    /* hash table for real buffer heads in current trans */ 
  struct reiserfs_journal_cnode *j_list_hash_table[JOURNAL_HASH_SIZE] ; /* hash table for all the real buffer heads in all 
  										the transactions */
  struct list_head j_prealloc_list;     /* list of inodes which have preallocated blocks */
};

#define JOURNAL_DESC_MAGIC "ReIsErLB" /* ick.  magic string to find desc blocks in the journal */


typedef __u32 (*hashf_t) (const signed char *, int);

struct reiserfs_bitmap_info
{
    // FIXME: Won't work with block sizes > 8K
    __u16  first_zero_hint;
    __u16  free_count;
    struct buffer_head *bh; /* the actual bitmap */
};

struct proc_dir_entry;

#if defined( CONFIG_PROC_FS ) && defined( CONFIG_REISERFS_PROC_INFO )
typedef unsigned long int stat_cnt_t;
typedef struct reiserfs_proc_info_data
{
  spinlock_t lock;
  int exiting;
  int max_hash_collisions;

  stat_cnt_t breads;
  stat_cnt_t bread_miss;
  stat_cnt_t search_by_key;
  stat_cnt_t search_by_key_fs_changed;
  stat_cnt_t search_by_key_restarted;

  stat_cnt_t insert_item_restarted;
  stat_cnt_t paste_into_item_restarted;
  stat_cnt_t cut_from_item_restarted;
  stat_cnt_t delete_solid_item_restarted;
  stat_cnt_t delete_item_restarted;

  stat_cnt_t leaked_oid;
  stat_cnt_t leaves_removable;

  /* balances per level. Use explicit 5 as MAX_HEIGHT is not visible yet. */
  stat_cnt_t balance_at[ 5 ]; /* XXX */
  /* sbk == search_by_key */
  stat_cnt_t sbk_read_at[ 5 ]; /* XXX */
  stat_cnt_t sbk_fs_changed[ 5 ];
  stat_cnt_t sbk_restarted[ 5 ];
  stat_cnt_t items_at[ 5 ]; /* XXX */
  stat_cnt_t free_at[ 5 ]; /* XXX */
  stat_cnt_t can_node_be_removed[ 5 ]; /* XXX */
  long int lnum[ 5 ]; /* XXX */
  long int rnum[ 5 ]; /* XXX */
  long int lbytes[ 5 ]; /* XXX */
  long int rbytes[ 5 ]; /* XXX */
  stat_cnt_t get_neighbors[ 5 ];
  stat_cnt_t get_neighbors_restart[ 5 ];
  stat_cnt_t need_l_neighbor[ 5 ];
  stat_cnt_t need_r_neighbor[ 5 ];

  stat_cnt_t free_block;
  struct __scan_bitmap_stats {
	stat_cnt_t call;
	stat_cnt_t wait;
	stat_cnt_t bmap;
	stat_cnt_t retry;
	stat_cnt_t in_journal_hint;
	stat_cnt_t in_journal_nohint;
	stat_cnt_t stolen;
  } scan_bitmap;
  struct __journal_stats {
	stat_cnt_t in_journal;
	stat_cnt_t in_journal_bitmap;
	stat_cnt_t in_journal_reusable;
	stat_cnt_t lock_journal;
	stat_cnt_t lock_journal_wait;
	stat_cnt_t journal_being;
	stat_cnt_t journal_relock_writers;
	stat_cnt_t journal_relock_wcount;
	stat_cnt_t mark_dirty;
	stat_cnt_t mark_dirty_already;
	stat_cnt_t mark_dirty_notjournal;
	stat_cnt_t restore_prepared;
	stat_cnt_t prepare;
	stat_cnt_t prepare_retry;
  } journal;
} reiserfs_proc_info_data_t;
#else
typedef struct reiserfs_proc_info_data
{} reiserfs_proc_info_data_t;
#endif

/* reiserfs union of in-core super block data */
struct reiserfs_sb_info
{
    struct buffer_head * s_sbh;                   /* Buffer containing the super block */
				/* both the comment and the choice of
                                   name are unclear for s_rs -Hans */
    struct reiserfs_super_block * s_rs;           /* Pointer to the super block in the buffer */
    struct reiserfs_bitmap_info * s_ap_bitmap;
    struct reiserfs_journal *s_journal ;		/* pointer to journal information */
    unsigned short s_mount_state;                 /* reiserfs state (valid, invalid) */
  
				/* Comment? -Hans */
    void (*end_io_handler)(struct buffer_head *, int);
    hashf_t s_hash_function;	/* pointer to function which is used
                                   to sort names in directory. Set on
                                   mount */
    unsigned long s_mount_opt;	/* reiserfs's mount options are set
                                   here (currently - NOTAIL, NOLOG,
                                   REPLAYONLY) */

    struct {			/* This is a structure that describes block allocator options */
	unsigned long bits;	/* Bitfield for enable/disable kind of options */
	unsigned long large_file_size; /* size started from which we consider file to be a large one(in blocks) */
	int border;		/* percentage of disk, border takes */
	int preallocmin;	/* Minimal file size (in blocks) starting from which we do preallocations */
	int preallocsize;	/* Number of blocks we try to prealloc when file
				   reaches preallocmin size (in blocks) or
				   prealloc_list is empty. */
    } s_alloc_options;

				/* Comment? -Hans */
    wait_queue_head_t s_wait;
				/* To be obsoleted soon by per buffer seals.. -Hans */
    atomic_t s_generation_counter; // increased by one every time the
    // tree gets re-balanced
    unsigned long s_properties;    /* File system properties. Currently holds
				     on-disk FS format */
    
    /* session statistics */
    int s_kmallocs;
    int s_disk_reads;
    int s_disk_writes;
    int s_fix_nodes;
    int s_do_balance;
    int s_unneeded_left_neighbor;
    int s_good_search_by_key_reada;
    int s_bmaps;
    int s_bmaps_without_search;
    int s_direct2indirect;
    int s_indirect2direct;
	/* set up when it's ok for reiserfs_read_inode2() to read from
	   disk inode with nlink==0. Currently this is only used during
	   finish_unfinished() processing at mount time */
    int s_is_unlinked_ok;
    reiserfs_proc_info_data_t s_proc_info_data;
    struct proc_dir_entry *procdir;
    int reserved_blocks; /* amount of blocks reserved for further allocations */
};

/* Definitions of reiserfs on-disk properties: */
#define REISERFS_3_5 0
#define REISERFS_3_6 1

/* Mount options */
#define REISERFS_LARGETAIL 0  /* large tails will be created in a session */
#define REISERFS_SMALLTAIL 17  /* small (for files less than block size) tails will be created in a session */
#define REPLAYONLY 3 /* replay journal and return 0. Use by fsck */
#define REISERFS_NOLOG 4      /* -o nolog: turn journalling off */
#define REISERFS_CONVERT 5    /* -o conv: causes conversion of old
                                 format super block to the new
                                 format. If not specified - old
                                 partition will be dealt with in a
                                 manner of 3.5.x */

/* -o hash={tea, rupasov, r5, detect} is meant for properly mounting 
** reiserfs disks from 3.5.19 or earlier.  99% of the time, this option
** is not required.  If the normal autodection code can't determine which
** hash to use (because both hases had the same value for a file)
** use this option to force a specific hash.  It won't allow you to override
** the existing hash on the FS, so if you have a tea hash disk, and mount
** with -o hash=rupasov, the mount will fail.
*/
#define FORCE_TEA_HASH 6      /* try to force tea hash on mount */
#define FORCE_RUPASOV_HASH 7  /* try to force rupasov hash on mount */
#define FORCE_R5_HASH 8       /* try to force rupasov hash on mount */
#define FORCE_HASH_DETECT 9   /* try to detect hash function on mount */


/* used for testing experimental features, makes benchmarking new
   features with and without more convenient, should never be used by
   users in any code shipped to users (ideally) */

#define REISERFS_NO_BORDER 11
#define REISERFS_NO_UNHASHED_RELOCATION 12
#define REISERFS_HASHED_RELOCATION 13
#define REISERFS_TEST4 14 

#define REISERFS_TEST1 11
#define REISERFS_TEST2 12
#define REISERFS_TEST3 13
#define REISERFS_TEST4 14 

#define REISERFS_ATTRS (15)

#define reiserfs_r5_hash(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << FORCE_R5_HASH))
#define reiserfs_rupasov_hash(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << FORCE_RUPASOV_HASH))
#define reiserfs_tea_hash(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << FORCE_TEA_HASH))
#define reiserfs_hash_detect(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << FORCE_HASH_DETECT))
#define reiserfs_no_border(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_NO_BORDER))
#define reiserfs_no_unhashed_relocation(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_NO_UNHASHED_RELOCATION))
#define reiserfs_hashed_relocation(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_HASHED_RELOCATION))
#define reiserfs_test4(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_TEST4))

#define have_large_tails(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_LARGETAIL))
#define have_small_tails(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_SMALLTAIL))
#define replay_only(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REPLAYONLY))
#define reiserfs_dont_log(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_NOLOG))
#define reiserfs_attrs(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_ATTRS))
#define old_format_only(s) ((s)->u.reiserfs_sb.s_properties & (1 << REISERFS_3_5))
#define convert_reiserfs(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_CONVERT))


void reiserfs_file_buffer (struct buffer_head * bh, int list);
int reiserfs_is_super(struct super_block *s)  ;
int journal_mark_dirty(struct reiserfs_transaction_handle *, struct super_block *, struct buffer_head *bh) ;
int flush_old_commits(struct super_block *s, int) ;
int show_reiserfs_locks(void) ;
int reiserfs_resize(struct super_block *, unsigned long) ;

#define CARRY_ON                0
#define SCHEDULE_OCCURRED       1


#define SB_BUFFER_WITH_SB(s) ((s)->u.reiserfs_sb.s_sbh)
#define SB_JOURNAL(s) ((s)->u.reiserfs_sb.s_journal)
#define SB_JOURNAL_LIST(s) (SB_JOURNAL(s)->j_journal_list)
#define SB_JOURNAL_LIST_INDEX(s) (SB_JOURNAL(s)->j_journal_list_index) 
#define SB_JOURNAL_LEN_FREE(s) (SB_JOURNAL(s)->j_journal_len_free) 
#define SB_AP_BITMAP(s) ((s)->u.reiserfs_sb.s_ap_bitmap)


// on-disk super block fields converted to cpu form
#define SB_DISK_SUPER_BLOCK(s)        ((s)->u.reiserfs_sb.s_rs)
#define SB_BLOCK_COUNT(s)             sb_block_count (SB_DISK_SUPER_BLOCK(s))
#define SB_FREE_BLOCKS(s)             sb_free_blocks (SB_DISK_SUPER_BLOCK(s))
#define SB_REISERFS_MAGIC(s)          (SB_DISK_SUPER_BLOCK(s)->s_magic)
#define SB_ROOT_BLOCK(s)              sb_root_block (SB_DISK_SUPER_BLOCK(s))
#define SB_TREE_HEIGHT(s)             sb_tree_height (SB_DISK_SUPER_BLOCK(s))
#define SB_REISERFS_STATE(s)          sb_state (SB_DISK_SUPER_BLOCK(s))
#define SB_VERSION(s)                 sb_version (SB_DISK_SUPER_BLOCK(s))
#define SB_BMAP_NR(s)                 sb_bmap_nr(SB_DISK_SUPER_BLOCK(s))

#define PUT_SB_BLOCK_COUNT(s, val)    do { set_sb_block_count( SB_DISK_SUPER_BLOCK(s), val); } while (0)
#define PUT_SB_FREE_BLOCKS(s, val)    do { set_sb_free_blocks( SB_DISK_SUPER_BLOCK(s), val); } while (0)
#define PUT_SB_ROOT_BLOCK(s, val)     do { set_sb_root_block( SB_DISK_SUPER_BLOCK(s), val); } while (0)
#define PUT_SB_TREE_HEIGHT(s, val)    do { set_sb_tree_height( SB_DISK_SUPER_BLOCK(s), val); } while (0)
#define PUT_SB_REISERFS_STATE(s, val) do { set_sb_state( SB_DISK_SUPER_BLOCK(s), val); } while (0) 
#define PUT_SB_VERSION(s, val)        do { set_sb_version( SB_DISK_SUPER_BLOCK(s), val); } while (0)
#define PUT_SB_BMAP_NR(s, val)        do { set_sb_bmap_nr( SB_DISK_SUPER_BLOCK(s), val); } while (0)

#endif	/* _LINUX_REISER_FS_SB */