121 lines
4.7 KiB
C
121 lines
4.7 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 'd_inode'
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*
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*/
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#ifndef EXT2_INODE_H
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#define EXT2_INODE_H
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#include <sys/queue.h>
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/* Disk part of inode structure was taken from
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* linux/include/linux/ext2_fs.h.
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*/
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EXTERN struct inode {
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u16_t i_mode; /* File mode */
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u16_t i_uid; /* Low 16 bits of Owner Uid */
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u32_t i_size; /* Size in bytes */
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u32_t i_atime; /* Access time */
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u32_t i_ctime; /* Creation time */
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u32_t i_mtime; /* Modification time */
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u32_t i_dtime; /* Deletion Time */
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u16_t i_gid; /* Low 16 bits of Group Id */
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u16_t i_links_count; /* Links count */
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u32_t i_blocks; /* 512-byte blocks count */
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u32_t i_flags; /* File flags */
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union {
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struct {
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u32_t l_i_reserved1;
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} linux1;
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struct {
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u32_t h_i_translator;
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} hurd1;
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struct {
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u32_t m_i_reserved1;
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} masix1;
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} osd1; /* OS dependent 1 */
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u32_t i_block[EXT2_N_BLOCKS]; /* Pointers to blocks */
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u32_t i_generation; /* File version (for NFS) */
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u32_t i_file_acl; /* File ACL */
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u32_t i_dir_acl; /* Directory ACL */
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u32_t i_faddr; /* Fragment address */
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union {
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struct {
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u8_t l_i_frag; /* Fragment number */
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u8_t l_i_fsize; /* Fragment size */
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u16_t i_pad1;
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u16_t l_i_uid_high; /* these 2 fields */
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u16_t l_i_gid_high; /* were reserved2[0] */
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u32_t l_i_reserved2;
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} linux2;
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struct {
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u8_t h_i_frag; /* Fragment number */
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u8_t h_i_fsize; /* Fragment size */
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u16_t h_i_mode_high;
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u16_t h_i_uid_high;
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u16_t h_i_gid_high;
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u32_t h_i_author;
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} hurd2;
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struct {
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u8_t m_i_frag; /* Fragment number */
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u8_t m_i_fsize; /* Fragment size */
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u16_t m_pad1;
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u32_t m_i_reserved2[2];
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} masix2;
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} osd2; /* OS dependent 2 */
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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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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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block_t i_bsearch; /* where to start search for new blocks,
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* also this is last allocated block.
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*/
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off_t i_last_pos_bl_alloc; /* last write position for which we allocated
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* a new block (should be block i_bsearch).
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* used to check for sequential operation.
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*/
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off_t i_last_dpos; /* where to start dentry search */
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int i_last_dentry_size; /* size of last found dentry */
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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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block_t i_prealloc_blocks[EXT2_PREALLOC_BLOCKS]; /* preallocated blocks */
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int i_prealloc_count; /* number of preallocated blocks */
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int i_prealloc_index; /* index into i_prealloc_blocks */
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int i_preallocation; /* use preallocation for this inode, normally
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* it's reset only when non-sequential write
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* happens.
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*/
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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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/* Field values. Note that CLEAN and DIRTY are defined in "const.h" */
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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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#endif /* EXT2_INODE_H */
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