servers/mfs/inode.h

   1 /* Inode table.  This table holds inodes that are currently in use.  In some
   2  * cases they have been opened by an open() or creat() system call, in other
   3  * cases the file system itself needs the inode for one reason or another,
   4  * such as to search a directory for a path name.
   5  * The first part of the struct holds fields that are present on the
   6  * disk; the second part holds fields not present on the disk.
   7  * The disk inode part is also declared in "type.h" as 'd1_inode' for V1
   8  * file systems and 'd2_inode' for V2 file systems.
   9  *
  10  * Updates:
  11  * 2007-01-06: jfdsmit@gmail.com added i_zsearch
  12  */
  13
  14 #include <sys/queue.h>
  15
  16 EXTERN struct inode {
  17   mode_t i_mode;                /* file type, protection, etc. */
  18   nlink_t i_nlinks;             /* how many links to this file */
  19   uid_t i_uid;                  /* user id of the file's owner */
  20   gid_t i_gid;                  /* group number */
  21   off_t i_size;                 /* current file size in bytes */
  22   time_t i_atime;               /* time of last access (V2 only) */
  23   time_t i_mtime;               /* when was file data last changed */
  24   time_t i_ctime;               /* when was inode itself changed (V2 only)*/
  25   zone_t i_zone[V2_NR_TZONES]; /* zone numbers for direct, ind, and dbl ind */
  26
  27   /* The following items are not present on the disk. */
  28   dev_t i_dev;                  /* which device is the inode on */
  29   ino_t i_num;                  /* inode number on its (minor) device */
  30   int i_count;                  /* # times inode used; 0 means slot is free */
  31   int i_ndzones;                /* # direct zones (Vx_NR_DZONES) */
  32   int i_nindirs;                /* # indirect zones per indirect block */
  33   struct super_block *i_sp;     /* pointer to super block for inode's device */
  34   char i_dirt;                  /* CLEAN or DIRTY */
  35   bit_t i_zsearch;              /* where to start search for new zones */
  36
  37   char i_mountpoint;            /* true if mounted on */
  38
  39   char i_seek;                  /* set on LSEEK, cleared on READ/WRITE */
  40   char i_update;                /* the ATIME, CTIME, and MTIME bits are here */
  41
  42   LIST_ENTRY(inode) i_hash;     /* hash list */
  43   TAILQ_ENTRY(inode) i_unused;  /* free and unused list */
  44
  45 } inode[NR_INODES];
  46
  47 /* list of unused/free inodes */
  48 EXTERN TAILQ_HEAD(unused_inodes_t, inode)  unused_inodes;
  49
  50 /* inode hashtable */
  51 EXTERN LIST_HEAD(inodelist, inode)         hash_inodes[INODE_HASH_SIZE];
  52
  53 EXTERN unsigned int inode_cache_hit;
  54 EXTERN unsigned int inode_cache_miss;
  55
  56 #define NIL_INODE (struct inode *) 0    /* indicates absence of inode slot */
  57
  58 /* Field values.  Note that CLEAN and DIRTY are defined in "const.h" */
  59 #define NO_SEEK            0    /* i_seek = NO_SEEK if last op was not SEEK */
  60 #define ISEEK              1    /* i_seek = ISEEK if last op was SEEK */