?? inode.h
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/* * The I node is the focus of all * file activity in unix. There is a unique * inode allocated for each active file, * each current directory, each mounted-on * file, text file, and the root. An inode is 'named' * by its dev/inumber pair. (iget/iget.c) * Data, from mode on, is read in * from permanent inode on volume. */#define NADDR 13#define NINDEX 15struct group { short g_state; char g_index; char g_rot; struct group *g_group; struct inode *g_inode; struct file *g_file; short g_rotmask; short g_datq; struct chan *g_chans[NINDEX];};struct inode{ char i_flag; char i_count; /* reference count */ dev_t i_dev; /* device where inode resides */ ino_t i_number; /* i number, 1-to-1 with device address */ unsigned short i_mode; short i_nlink; /* directory entries */ short i_uid; /* owner */ short i_gid; /* group of owner */ off_t i_size; /* size of file */ union { struct { daddr_t i_addr[NADDR]; /* if normal file/directory */ daddr_t i_lastr; /* last logical block read (for read-ahead) */ }; struct { daddr_t i_rdev; /* i_addr[0] */ struct group i_group; /* multiplexor group file */ }; } i_un;};extern struct inode inode[]; /* The inode table itself */struct inode *mpxip; /* mpx virtual inode *//* flags */#define ILOCK 01 /* inode is locked */#define IUPD 02 /* file has been modified */#define IACC 04 /* inode access time to be updated */#define IMOUNT 010 /* inode is mounted on */#define IWANT 020 /* some process waiting on lock */#define ITEXT 040 /* inode is pure text prototype */#define ICHG 0100 /* inode has been changed *//* modes */#define IFMT 0170000 /* type of file */#define IFDIR 0040000 /* directory */#define IFCHR 0020000 /* character special */#define IFBLK 0060000 /* block special */#define IFREG 0100000 /* regular */#define IFMPC 0030000 /* multiplexed char special */#define IFMPB 0070000 /* multiplexed block special */#define ISUID 04000 /* set user id on execution */#define ISGID 02000 /* set group id on execution */#define ISVTX 01000 /* save swapped text even after use */#define IREAD 0400 /* read, write, execute permissions */#define IWRITE 0200#define IEXEC 0100
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