63 lines
2.7 KiB
C
63 lines
2.7 KiB
C
/* Inode table. This table holds inodes that are currently in use. In some
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* cases they have been opened by an open() or creat() system call, in other
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* cases the file system itself needs the inode for one reason or another,
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* such as to search a directory for a path name.
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* The first part of the struct holds fields that are present on the
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* disk; the second part holds fields not present on the disk.
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* The disk inode part is also declared in "type.h" as 'd1_inode' for V1
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* file systems and 'd2_inode' for V2 file systems.
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*
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* Updates:
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* 2007-01-06: jfdsmit@gmail.com added i_zsearch
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*/
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#include "queue.h"
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EXTERN struct inode {
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mode_t i_mode; /* file type, protection, etc. */
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nlink_t i_nlinks; /* how many links to this file */
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uid_t i_uid; /* user id of the file's owner */
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gid_t i_gid; /* group number */
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off_t i_size; /* current file size in bytes */
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time_t i_atime; /* time of last access (V2 only) */
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time_t i_mtime; /* when was file data last changed */
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time_t i_ctime; /* when was inode itself changed (V2 only)*/
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zone_t i_zone[V2_NR_TZONES]; /* zone numbers for direct, ind, and dbl ind */
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/* The following items are not present on the disk. */
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dev_t i_dev; /* which device is the inode on */
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ino_t i_num; /* inode number on its (minor) device */
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int i_count; /* # times inode used; 0 means slot is free */
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int i_ndzones; /* # direct zones (Vx_NR_DZONES) */
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int i_nindirs; /* # indirect zones per indirect block */
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struct super_block *i_sp; /* pointer to super block for inode's device */
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char i_dirt; /* CLEAN or DIRTY */
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char i_pipe; /* set to I_PIPE if pipe */
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bit_t i_zsearch; /* where to start search for new zones */
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char i_mountpoint; /* true if mounted on */
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char i_seek; /* set on LSEEK, cleared on READ/WRITE */
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char i_update; /* the ATIME, CTIME, and MTIME bits are here */
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LIST_ENTRY(inode) i_hash; /* hash list */
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TAILQ_ENTRY(inode) i_unused; /* free and unused list */
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} inode[NR_INODES];
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/* list of unused/free inodes */
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EXTERN TAILQ_HEAD(unused_inodes_t, inode) unused_inodes;
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/* inode hashtable */
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EXTERN LIST_HEAD(inodelist, inode) hash_inodes[INODE_HASH_SIZE];
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EXTERN unsigned int inode_cache_hit;
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EXTERN unsigned int inode_cache_miss;
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#define NIL_INODE (struct inode *) 0 /* indicates absence of inode slot */
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/* Field values. Note that CLEAN and DIRTY are defined in "const.h" */
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#define NO_PIPE 0 /* i_pipe is NO_PIPE if inode is not a pipe */
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#define I_PIPE 1 /* i_pipe is I_PIPE if inode is a pipe */
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#define NO_SEEK 0 /* i_seek = NO_SEEK if last op was not SEEK */
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#define ISEEK 1 /* i_seek = ISEEK if last op was SEEK */
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