servers/mfs/inode.h

   1 #ifndef __MFS_INODE_H__
   2 #define __MFS_INODE_H__
   3
   4 /* Inode table.  This table holds inodes that are currently in use.  In some
   5  * cases they have been opened by an open() or creat() system call, in other
   6  * cases the file system itself needs the inode for one reason or another,
   7  * such as to search a directory for a path name.
   8  * The first part of the struct holds fields that are present on the
   9  * disk; the second part holds fields not present on the disk.
  10  * The disk inode part is also declared in "type.h" as 'd1_inode' for V1
  11  * file systems and 'd2_inode' for V2 file systems.
  12  *
  13  * Updates:
  14  * 2007-01-06: jfdsmit@gmail.com added i_zsearch
  15  */
  16
  17 #include <sys/queue.h>
  18
  19 #include "super.h"
  20
  21 EXTERN struct inode {
  22   u16_t i_mode;         /* file type, protection, etc. */
  23   u16_t i_nlinks;               /* how many links to this file */
  24   u16_t i_uid;                  /* user id of the file's owner */
  25   u16_t i_gid;                  /* group number */
  26   i32_t i_size;                 /* current file size in bytes */
  27   u32_t i_atime;                /* time of last access (V2 only) */
  28   u32_t i_mtime;                /* when was file data last changed */
  29   u32_t i_ctime;                /* when was inode itself changed (V2 only)*/
  30   u32_t i_zone[V2_NR_TZONES]; /* zone numbers for direct, ind, and dbl ind */
  31
  32   /* The following items are not present on the disk. */
  33   dev_t i_dev;                  /* which device is the inode on */
  34   ino_t i_num;                  /* inode number on its (minor) device */
  35   int i_count;                  /* # times inode used; 0 means slot is free */
  36   unsigned int i_ndzones;       /* # direct zones (Vx_NR_DZONES) */
  37   unsigned int i_nindirs;       /* # indirect zones per indirect block */
  38   struct super_block *i_sp;     /* pointer to super block for inode's device */
  39   char i_dirt;                  /* CLEAN or DIRTY */
  40   zone_t i_zsearch;             /* where to start search for new zones */
  41   off_t i_last_dpos;            /* where to start dentry search */
  42
  43   char i_mountpoint;            /* true if mounted on */
  44
  45   char i_seek;                  /* set on LSEEK, cleared on READ/WRITE */
  46   char i_update;                /* the ATIME, CTIME, and MTIME bits are here */
  47
  48   LIST_ENTRY(inode) i_hash;     /* hash list */
  49   TAILQ_ENTRY(inode) i_unused;  /* free and unused list */
  50
  51 } inode[NR_INODES];
  52
  53 /* list of unused/free inodes */
  54 EXTERN TAILQ_HEAD(unused_inodes_t, inode)  unused_inodes;
  55
  56 /* inode hashtable */
  57 EXTERN LIST_HEAD(inodelist, inode)         hash_inodes[INODE_HASH_SIZE];
  58
  59 EXTERN unsigned int inode_cache_hit;
  60 EXTERN unsigned int inode_cache_miss;
  61
  62
  63 /* Field values.  Note that CLEAN and DIRTY are defined in "const.h" */
  64 #define NO_SEEK            0    /* i_seek = NO_SEEK if last op was not SEEK */
  65 #define ISEEK              1    /* i_seek = ISEEK if last op was SEEK */
  66
  67 #define IN_MARKCLEAN(i) i->i_dirt = IN_CLEAN
  68 #define IN_MARKDIRTY(i) do { if(i->i_sp->s_rd_only) { printf("%s:%d: dirty inode on rofs ", __FILE__, __LINE__); util_stacktrace(); } else { i->i_dirt = IN_DIRTY; } } while(0)
  69
  70 #define IN_ISCLEAN(i) i->i_dirt == IN_CLEAN
  71 #define IN_ISDIRTY(i) i->i_dirt == IN_DIRTY
  72
  73 #endif