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 * 11 * Updates: 12 * 2007-01-06: jfdsmit@gmail.com added i_zsearch 13 */ 14 15 #include <sys/queue.h> 16 #include <minix/vfsif.h> 17 18 #include "super.h" 19 20 EXTERN struct inode { 21 u16_t i_mode; /* file type, protection, etc. */ 22 u16_t i_nlinks; /* how many links to this file */ 23 u16_t i_uid; /* user id of the file's owner */ 24 u16_t i_gid; /* group number */ 25 i32_t i_size; /* current file size in bytes */ 26 u32_t i_atime; /* time of last access (V2 only) */ 27 u32_t i_mtime; /* when was file data last changed */ 28 u32_t i_ctime; /* when was inode itself changed (V2 only)*/ 29 u32_t i_zone[V2_NR_TZONES]; /* zone numbers for direct, ind, and dbl ind */ 30 31 /* The following items are not present on the disk. */ 32 dev_t i_dev; /* which device is the inode on */ 33 ino_t i_num; /* inode number on its (minor) device */ 34 int i_count; /* # times inode used; 0 means slot is free */ 35 unsigned int i_ndzones; /* # direct zones (Vx_NR_DZONES) */ 36 unsigned int i_nindirs; /* # indirect zones per indirect block */ 37 struct super_block *i_sp; /* pointer to super block for inode's device */ 38 char i_dirt; /* CLEAN or DIRTY */ 39 zone_t i_zsearch; /* where to start search for new zones */ 40 off_t i_last_dpos; /* where to start dentry search */ 41 42 char i_mountpoint; /* true if mounted on */ 43 44 char i_seek; /* set on LSEEK, cleared on READ/WRITE */ 45 char i_update; /* the ATIME, CTIME, and MTIME bits are here */ 46 47 LIST_ENTRY(inode) i_hash; /* hash list */ 48 TAILQ_ENTRY(inode) i_unused; /* free and unused list */ 49 50 } inode[NR_INODES]; 51 52 /* list of unused/free inodes */ 53 EXTERN TAILQ_HEAD(unused_inodes_t, inode) unused_inodes; 54 55 /* inode hashtable */ 56 EXTERN LIST_HEAD(inodelist, inode) hash_inodes[INODE_HASH_SIZE]; 57 58 EXTERN unsigned int inode_cache_hit; 59 EXTERN unsigned int inode_cache_miss; 60 61 62 /* Field values. Note that CLEAN and DIRTY are defined in "const.h" */ 63 #define NO_SEEK 0 /* i_seek = NO_SEEK if last op was not SEEK */ 64 #define ISEEK 1 /* i_seek = ISEEK if last op was SEEK */ 65 66 #define IN_MARKCLEAN(i) i->i_dirt = IN_CLEAN 67 #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) 68 69 #define IN_ISCLEAN(i) i->i_dirt == IN_CLEAN 70 #define IN_ISDIRTY(i) i->i_dirt == IN_DIRTY 71 72 #endif 73