reiserfs_fs.h

来自「Linux Kernel 2.6.9 for OMAP1710」· C头文件 代码 · 共 1,597 行 · 第 1/5 页

}


static inline void set_le_key_k_type (int version, struct key * key, int type)
{
    (version == KEY_FORMAT_3_5) ?
        (void)(key->u.k_offset_v1.k_uniqueness = cpu_to_le32(type2uniqueness(type))):
	(void)(set_offset_v2_k_type( &(key->u.k_offset_v2), type ));
}
static inline void set_le_ih_k_type (struct item_head * ih, int type)
{
    set_le_key_k_type (ih_version (ih), &(ih->ih_key), type);
}


#define is_direntry_le_key(version,key) (le_key_k_type (version, key) == TYPE_DIRENTRY)
#define is_direct_le_key(version,key) (le_key_k_type (version, key) == TYPE_DIRECT)
#define is_indirect_le_key(version,key) (le_key_k_type (version, key) == TYPE_INDIRECT)
#define is_statdata_le_key(version,key) (le_key_k_type (version, key) == TYPE_STAT_DATA)

//
// item header has version.
//
#define is_direntry_le_ih(ih) is_direntry_le_key (ih_version (ih), &((ih)->ih_key))
#define is_direct_le_ih(ih) is_direct_le_key (ih_version (ih), &((ih)->ih_key))
#define is_indirect_le_ih(ih) is_indirect_le_key (ih_version(ih), &((ih)->ih_key))
#define is_statdata_le_ih(ih) is_statdata_le_key (ih_version (ih), &((ih)->ih_key))



//
// key is pointer to cpu key, result is cpu
//
static inline loff_t cpu_key_k_offset (const struct cpu_key * key)
{
    return (key->version == KEY_FORMAT_3_5) ?
        key->on_disk_key.u.k_offset_v1.k_offset :
	key->on_disk_key.u.k_offset_v2.k_offset;
}

static inline loff_t cpu_key_k_type (const struct cpu_key * key)
{
    return (key->version == KEY_FORMAT_3_5) ?
        uniqueness2type (key->on_disk_key.u.k_offset_v1.k_uniqueness) :
	key->on_disk_key.u.k_offset_v2.k_type;
}

static inline void set_cpu_key_k_offset (struct cpu_key * key, loff_t offset)
{
    (key->version == KEY_FORMAT_3_5) ?
        (key->on_disk_key.u.k_offset_v1.k_offset = offset) :
	(key->on_disk_key.u.k_offset_v2.k_offset = offset);
}


static inline void set_cpu_key_k_type (struct cpu_key * key, int type)
{
    (key->version == KEY_FORMAT_3_5) ?
        (key->on_disk_key.u.k_offset_v1.k_uniqueness = type2uniqueness (type)):
	(key->on_disk_key.u.k_offset_v2.k_type = type);
}


static inline void cpu_key_k_offset_dec (struct cpu_key * key)
{
    if (key->version == KEY_FORMAT_3_5)
	key->on_disk_key.u.k_offset_v1.k_offset --;
    else
	key->on_disk_key.u.k_offset_v2.k_offset --;
}


#define is_direntry_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRENTRY)
#define is_direct_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRECT)
#define is_indirect_cpu_key(key) (cpu_key_k_type (key) == TYPE_INDIRECT)
#define is_statdata_cpu_key(key) (cpu_key_k_type (key) == TYPE_STAT_DATA)


/* are these used ? */
#define is_direntry_cpu_ih(ih) (is_direntry_cpu_key (&((ih)->ih_key)))
#define is_direct_cpu_ih(ih) (is_direct_cpu_key (&((ih)->ih_key)))
#define is_indirect_cpu_ih(ih) (is_indirect_cpu_key (&((ih)->ih_key)))
#define is_statdata_cpu_ih(ih) (is_statdata_cpu_key (&((ih)->ih_key)))





#define I_K_KEY_IN_ITEM(p_s_ih, p_s_key, n_blocksize) \
    ( ! COMP_SHORT_KEYS(p_s_ih, p_s_key) && \
          I_OFF_BYTE_IN_ITEM(p_s_ih, k_offset (p_s_key), n_blocksize) )

/* maximal length of item */ 
#define MAX_ITEM_LEN(block_size) (block_size - BLKH_SIZE - IH_SIZE)
#define MIN_ITEM_LEN 1


/* object identifier for root dir */
#define REISERFS_ROOT_OBJECTID 2
#define REISERFS_ROOT_PARENT_OBJECTID 1
extern struct key root_key;




/* 
 * Picture represents a leaf of the S+tree
 *  ______________________________________________________
 * |      |  Array of     |                   |           |
 * |Block |  Object-Item  |      F r e e      |  Objects- |
 * | head |  Headers      |     S p a c e     |   Items   |
 * |______|_______________|___________________|___________|
 */

/* Header of a disk block.  More precisely, header of a formatted leaf
   or internal node, and not the header of an unformatted node. */
struct block_head {       
  __u16 blk_level;        /* Level of a block in the tree. */
  __u16 blk_nr_item;      /* Number of keys/items in a block. */
  __u16 blk_free_space;   /* Block free space in bytes. */
  __u16 blk_reserved;
				/* dump this in v4/planA */
  struct key  blk_right_delim_key; /* kept only for compatibility */
};

#define BLKH_SIZE                     (sizeof(struct block_head))
#define blkh_level(p_blkh)            (le16_to_cpu((p_blkh)->blk_level))
#define blkh_nr_item(p_blkh)          (le16_to_cpu((p_blkh)->blk_nr_item))
#define blkh_free_space(p_blkh)       (le16_to_cpu((p_blkh)->blk_free_space))
#define blkh_reserved(p_blkh)         (le16_to_cpu((p_blkh)->blk_reserved))
#define set_blkh_level(p_blkh,val)    ((p_blkh)->blk_level = cpu_to_le16(val))
#define set_blkh_nr_item(p_blkh,val)  ((p_blkh)->blk_nr_item = cpu_to_le16(val))
#define set_blkh_free_space(p_blkh,val) ((p_blkh)->blk_free_space = cpu_to_le16(val))
#define set_blkh_reserved(p_blkh,val) ((p_blkh)->blk_reserved = cpu_to_le16(val))
#define blkh_right_delim_key(p_blkh)  ((p_blkh)->blk_right_delim_key)
#define set_blkh_right_delim_key(p_blkh,val)  ((p_blkh)->blk_right_delim_key = val)

/*
 * values for blk_level field of the struct block_head
 */

#define FREE_LEVEL 0 /* when node gets removed from the tree its
			blk_level is set to FREE_LEVEL. It is then
			used to see whether the node is still in the
			tree */

#define DISK_LEAF_NODE_LEVEL  1 /* Leaf node level.*/

/* Given the buffer head of a formatted node, resolve to the block head of that node. */
#define B_BLK_HEAD(p_s_bh)            ((struct block_head *)((p_s_bh)->b_data))
/* Number of items that are in buffer. */
#define B_NR_ITEMS(p_s_bh)            (blkh_nr_item(B_BLK_HEAD(p_s_bh)))
#define B_LEVEL(p_s_bh)               (blkh_level(B_BLK_HEAD(p_s_bh)))
#define B_FREE_SPACE(p_s_bh)          (blkh_free_space(B_BLK_HEAD(p_s_bh)))

#define PUT_B_NR_ITEMS(p_s_bh,val)    do { set_blkh_nr_item(B_BLK_HEAD(p_s_bh),val); } while (0)
#define PUT_B_LEVEL(p_s_bh,val)       do { set_blkh_level(B_BLK_HEAD(p_s_bh),val); } while (0)
#define PUT_B_FREE_SPACE(p_s_bh,val)  do { set_blkh_free_space(B_BLK_HEAD(p_s_bh),val); } while (0)


/* Get right delimiting key. -- little endian */
#define B_PRIGHT_DELIM_KEY(p_s_bh)   (&(blk_right_delim_key(B_BLK_HEAD(p_s_bh))

/* Does the buffer contain a disk leaf. */
#define B_IS_ITEMS_LEVEL(p_s_bh)     (B_LEVEL(p_s_bh) == DISK_LEAF_NODE_LEVEL)

/* Does the buffer contain a disk internal node */
#define B_IS_KEYS_LEVEL(p_s_bh)      (B_LEVEL(p_s_bh) > DISK_LEAF_NODE_LEVEL \
                                            && B_LEVEL(p_s_bh) <= MAX_HEIGHT)




/***************************************************************************/
/*                             STAT DATA                                   */
/***************************************************************************/


//
// old stat data is 32 bytes long. We are going to distinguish new one by
// different size
//
struct stat_data_v1
{
    __u16 sd_mode;	/* file type, permissions */
    __u16 sd_nlink;	/* number of hard links */
    __u16 sd_uid;		/* owner */
    __u16 sd_gid;		/* group */
    __u32 sd_size;	/* file size */
    __u32 sd_atime;	/* time of last access */
    __u32 sd_mtime;	/* time file was last modified  */
    __u32 sd_ctime;	/* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
    union {
	__u32 sd_rdev;
	__u32 sd_blocks;	/* number of blocks file uses */
    } __attribute__ ((__packed__)) u;
    __u32 sd_first_direct_byte; /* first byte of file which is stored
				   in a direct item: except that if it
				   equals 1 it is a symlink and if it
				   equals ~(__u32)0 there is no
				   direct item.  The existence of this
				   field really grates on me. Let's
				   replace it with a macro based on
				   sd_size and our tail suppression
				   policy.  Someday.  -Hans */
} __attribute__ ((__packed__));

#define SD_V1_SIZE              (sizeof(struct stat_data_v1))
#define stat_data_v1(ih)        (ih_version (ih) == KEY_FORMAT_3_5)
#define sd_v1_mode(sdp)         (le16_to_cpu((sdp)->sd_mode))
#define set_sd_v1_mode(sdp,v)   ((sdp)->sd_mode = cpu_to_le16(v))
#define sd_v1_nlink(sdp)        (le16_to_cpu((sdp)->sd_nlink))
#define set_sd_v1_nlink(sdp,v)  ((sdp)->sd_nlink = cpu_to_le16(v))
#define sd_v1_uid(sdp)          (le16_to_cpu((sdp)->sd_uid))
#define set_sd_v1_uid(sdp,v)    ((sdp)->sd_uid = cpu_to_le16(v))
#define sd_v1_gid(sdp)          (le16_to_cpu((sdp)->sd_gid))
#define set_sd_v1_gid(sdp,v)    ((sdp)->sd_gid = cpu_to_le16(v))
#define sd_v1_size(sdp)         (le32_to_cpu((sdp)->sd_size))
#define set_sd_v1_size(sdp,v)   ((sdp)->sd_size = cpu_to_le32(v))
#define sd_v1_atime(sdp)        (le32_to_cpu((sdp)->sd_atime))
#define set_sd_v1_atime(sdp,v)  ((sdp)->sd_atime = cpu_to_le32(v))
#define sd_v1_mtime(sdp)        (le32_to_cpu((sdp)->sd_mtime))
#define set_sd_v1_mtime(sdp,v)  ((sdp)->sd_mtime = cpu_to_le32(v))
#define sd_v1_ctime(sdp)        (le32_to_cpu((sdp)->sd_ctime))
#define set_sd_v1_ctime(sdp,v)  ((sdp)->sd_ctime = cpu_to_le32(v))
#define sd_v1_rdev(sdp)         (le32_to_cpu((sdp)->u.sd_rdev))
#define set_sd_v1_rdev(sdp,v)   ((sdp)->u.sd_rdev = cpu_to_le32(v))
#define sd_v1_blocks(sdp)       (le32_to_cpu((sdp)->u.sd_blocks))
#define set_sd_v1_blocks(sdp,v) ((sdp)->u.sd_blocks = cpu_to_le32(v))
#define sd_v1_first_direct_byte(sdp) \
                                (le32_to_cpu((sdp)->sd_first_direct_byte))
#define set_sd_v1_first_direct_byte(sdp,v) \
                                ((sdp)->sd_first_direct_byte = cpu_to_le32(v))

#include <linux/ext2_fs.h>

/* inode flags stored in sd_attrs (nee sd_reserved) */

/* we want common flags to have the same values as in ext2,
   so chattr(1) will work without problems */
#define REISERFS_IMMUTABLE_FL EXT2_IMMUTABLE_FL
#define REISERFS_APPEND_FL    EXT2_APPEND_FL
#define REISERFS_SYNC_FL      EXT2_SYNC_FL
#define REISERFS_NOATIME_FL   EXT2_NOATIME_FL
#define REISERFS_NODUMP_FL    EXT2_NODUMP_FL
#define REISERFS_SECRM_FL     EXT2_SECRM_FL
#define REISERFS_UNRM_FL      EXT2_UNRM_FL
#define REISERFS_COMPR_FL     EXT2_COMPR_FL
#define REISERFS_NOTAIL_FL    EXT2_NOTAIL_FL

/* persistent flags that file inherits from the parent directory */
#define REISERFS_INHERIT_MASK ( REISERFS_IMMUTABLE_FL |	\
				REISERFS_SYNC_FL |	\
				REISERFS_NOATIME_FL |	\
				REISERFS_NODUMP_FL |	\
				REISERFS_SECRM_FL |	\
				REISERFS_COMPR_FL |	\
				REISERFS_NOTAIL_FL )

/* Stat Data on disk (reiserfs version of UFS disk inode minus the
   address blocks) */
struct stat_data {
    __u16 sd_mode;	/* file type, permissions */
    __u16 sd_attrs;     /* persistent inode flags */
    __u32 sd_nlink;	/* number of hard links */
    __u64 sd_size;	/* file size */
    __u32 sd_uid;		/* owner */
    __u32 sd_gid;		/* group */
    __u32 sd_atime;	/* time of last access */
    __u32 sd_mtime;	/* time file was last modified  */
    __u32 sd_ctime;	/* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
    __u32 sd_blocks;
    union {
	__u32 sd_rdev;
	__u32 sd_generation;
      //__u32 sd_first_direct_byte; 
      /* first byte of file which is stored in a
				       direct item: except that if it equals 1
				       it is a symlink and if it equals
				       ~(__u32)0 there is no direct item.  The
				       existence of this field really grates
				       on me. Let's replace it with a macro
				       based on sd_size and our tail
				       suppression policy? */
  } __attribute__ ((__packed__)) u;
} __attribute__ ((__packed__));
//
// this is 44 bytes long
//
#define SD_SIZE (sizeof(struct stat_data))
#define SD_V2_SIZE              SD_SIZE
#define stat_data_v2(ih)        (ih_version (ih) == KEY_FORMAT_3_6)
#define sd_v2_mode(sdp)         (le16_to_cpu((sdp)->sd_mode))
#define set_sd_v2_mode(sdp,v)   ((sdp)->sd_mode = cpu_to_le16(v))
/* sd_reserved */
/* set_sd_reserved */
#define sd_v2_nlink(sdp)        (le32_to_cpu((sdp)->sd_nlink))
#define set_sd_v2_nlink(sdp,v)  ((sdp)->sd_nlink = cpu_to_le32(v))
#define sd_v2_size(sdp)         (le64_to_cpu((sdp)->sd_size))
#define set_sd_v2_size(sdp,v)   ((sdp)->sd_size = cpu_to_le64(v))
#define sd_v2_uid(sdp)          (le32_to_cpu((sdp)->sd_uid))
#define set_sd_v2_uid(sdp,v)    ((sdp)->sd_uid = cpu_to_le32(v))
#define sd_v2_gid(sdp)          (le32_to_cpu((sdp)->sd_gid))
#define set_sd_v2_gid(sdp,v)    ((sdp)->sd_gid = cpu_to_le32(v))
#define sd_v2_atime(sdp)        (le32_to_cpu((sdp)->sd_atime))
#define set_sd_v2_atime(sdp,v)  ((sdp)->sd_atime = cpu_to_le32(v))
#define sd_v2_mtime(sdp)        (le32_to_cpu((sdp)->sd_mtime))
#define set_sd_v2_mtime(sdp,v)  ((sdp)->sd_mtime = cpu_to_le32(v))
#define sd_v2_ctime(sdp)        (le32_to_cpu((sdp)->sd_ctime))
#define set_sd_v2_ctime(sdp,v)  ((sdp)->sd_ctime = cpu_to_le32(v))
#define sd_v2_blocks(sdp)       (le32_to_cpu((sdp)->sd_blocks))
#define set_sd_v2_blocks(sdp,v) ((sdp)->sd_blocks = cpu_to_le32(v))
#define sd_v2_rdev(sdp)         (le32_to_cpu((sdp)->u.sd_rdev))
#define set_sd_v2_rdev(sdp,v)   ((sdp)->u.sd_rdev = cpu_to_le32(v))
#define sd_v2_generation(sdp)   (le32_to_cpu((sdp)->u.sd_generation))
#define set_sd_v2_generation(sdp,v) ((sdp)->u.sd_generation = cpu_to_le32(v))
#define sd_v2_attrs(sdp)         (le16_to_cpu((sdp)->sd_attrs))
#define set_sd_v2_attrs(sdp,v)   ((sdp)->sd_attrs = cpu_to_le16(v))