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/* Inode table. This table holds inodes that are currently in use. In some
* cases they have been opened by an open() or creat() system call, in other
* cases the file system itself needs the inode for one reason or another,
* such as to search a directory for a path name.
* The first part of the struct holds fields that are present on the
* disk; the second part holds fields not present on the disk.
* The disk inode part is also declared in "type.h" as 'd_inode'
*
*/
#ifndef EXT2_INODE_H
#define EXT2_INODE_H
#include <sys/queue.h>
/* Disk part of inode structure was taken from
* linux/include/linux/ext2_fs.h.
*/
EXTERN struct inode {
u16_t i_mode; /* File mode */
u16_t i_uid; /* Low 16 bits of Owner Uid */
u32_t i_size; /* Size in bytes */
u32_t i_atime; /* Access time */
u32_t i_ctime; /* Creation time */
u32_t i_mtime; /* Modification time */
u32_t i_dtime; /* Deletion Time */
u16_t i_gid; /* Low 16 bits of Group Id */
u16_t i_links_count; /* Links count */
u32_t i_blocks; /* 512-byte blocks count */
u32_t i_flags; /* File flags */
union {
struct {
u32_t l_i_reserved1;
} linux1;
struct {
u32_t h_i_translator;
} hurd1;
struct {
u32_t m_i_reserved1;
} masix1;
} osd1; /* OS dependent 1 */
u32_t i_block[EXT2_N_BLOCKS]; /* Pointers to blocks */
u32_t i_generation; /* File version (for NFS) */
u32_t i_file_acl; /* File ACL */
u32_t i_dir_acl; /* Directory ACL */
u32_t i_faddr; /* Fragment address */
union {
struct {
u8_t l_i_frag; /* Fragment number */
u8_t l_i_fsize; /* Fragment size */
u16_t i_pad1;
u16_t l_i_uid_high; /* these 2 fields */
u16_t l_i_gid_high; /* were reserved2[0] */
u32_t l_i_reserved2;
} linux2;
struct {
u8_t h_i_frag; /* Fragment number */
u8_t h_i_fsize; /* Fragment size */
u16_t h_i_mode_high;
u16_t h_i_uid_high;
u16_t h_i_gid_high;
u32_t h_i_author;
} hurd2;
struct {
u8_t m_i_frag; /* Fragment number */
u8_t m_i_fsize; /* Fragment size */
u16_t m_pad1;
u32_t m_i_reserved2[2];
} masix2;
} osd2; /* OS dependent 2 */
/* The following items are not present on the disk. */
dev_t i_dev; /* which device is the inode on */
ino_t i_num; /* inode number on its (minor) device */
int i_count; /* # times inode used; 0 means slot is free */
struct super_block *i_sp; /* pointer to super block for inode's device */
char i_dirt; /* CLEAN or DIRTY */
block_t i_bsearch; /* where to start search for new blocks,
* also this is last allocated block.
*/
off_t i_last_pos_bl_alloc; /* last write position for which we allocated
* a new block (should be block i_bsearch).
* used to check for sequential operation.
*/
off_t i_last_dpos; /* where to start dentry search */
int i_last_dentry_size; /* size of last found dentry */
char i_mountpoint; /* true if mounted on */
char i_seek; /* set on LSEEK, cleared on READ/WRITE */
char i_update; /* the ATIME, CTIME, and MTIME bits are here */
block_t i_prealloc_blocks[EXT2_PREALLOC_BLOCKS]; /* preallocated blocks */
int i_prealloc_count; /* number of preallocated blocks */
int i_prealloc_index; /* index into i_prealloc_blocks */
int i_preallocation; /* use preallocation for this inode, normally
* it's reset only when non-sequential write
* happens.
*/
LIST_ENTRY(inode) i_hash; /* hash list */
TAILQ_ENTRY(inode) i_unused; /* free and unused list */
} inode[NR_INODES];
/* list of unused/free inodes */
EXTERN TAILQ_HEAD(unused_inodes_t, inode) unused_inodes;
/* inode hashtable */
EXTERN LIST_HEAD(inodelist, inode) hash_inodes[INODE_HASH_SIZE];
EXTERN unsigned int inode_cache_hit;
EXTERN unsigned int inode_cache_miss;
/* Field values. Note that CLEAN and DIRTY are defined in "const.h" */
#define NO_SEEK 0 /* i_seek = NO_SEEK if last op was not SEEK */
#define ISEEK 1 /* i_seek = ISEEK if last op was SEEK */
#endif /* EXT2_INODE_H */
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