c - inode 实际上是否指向磁盘中的地址？

Linux文件系统中的 inode 实际上如何指向磁盘上的块？它是否包含指向0到2 ^ 63-1的64位可寻址数字？还是在 inode 结构和实际磁盘地址之间存在一层？

最佳答案

如osdev wiki中的ext2 inode所述:



您可能知道，在VFS中使用的Linux操作系统中有一个逻辑inode。
VFS inode数据结构保存有关磁盘上文件或目录的信息。

struct inode {
    kdev_t                       i_dev;
    unsigned long                i_ino;
    umode_t                      i_mode;
    nlink_t                      i_nlink;
    uid_t                        i_uid;
    gid_t                        i_gid;
    kdev_t                       i_rdev;
    off_t                        i_size;
    time_t                       i_atime;
    time_t                       i_mtime;
    time_t                       i_ctime;
    unsigned long                i_blksize;
    unsigned long                i_blocks;
    unsigned long                i_version;
    unsigned long                i_nrpages;
    struct semaphore             i_sem;
    struct inode_operations      *i_op;
    struct super_block           *i_sb;
    struct wait_queue            *i_wait;
    struct file_lock             *i_flock;
    struct vm_area_struct        *i_mmap;
    struct page                  *i_pages;
    struct dquot                 *i_dquot[MAXQUOTAS];
    struct inode                 *i_next, *i_prev;
    struct inode                 *i_hash_next, *i_hash_prev;
    struct inode                 *i_bound_to, *i_bound_by;
    struct inode                 *i_mount;
    unsigned short               i_count;
    unsigned short               i_flags;
    unsigned char                i_lock;
    unsigned char                i_dirt;
    unsigned char                i_pipe;
    unsigned char                i_sock;
    unsigned char                i_seek;
    unsigned char                i_update;
    unsigned short               i_writecount;
    union {
        struct pipe_inode_info   pipe_i;
        struct minix_inode_info  minix_i;
        struct ext_inode_info    ext_i;
        struct ext2_inode_info   ext2_i;
        struct hpfs_inode_info   hpfs_i;
        struct msdos_inode_info  msdos_i;
        struct umsdos_inode_info umsdos_i;
        struct iso_inode_info    isofs_i;
        struct nfs_inode_info    nfs_i;
        struct xiafs_inode_info  xiafs_i;
        struct sysv_inode_info   sysv_i;
        struct affs_inode_info   affs_i;
        struct ufs_inode_info    ufs_i;
        struct socket            socket_i;
        void                     *generic_ip;
    } u;
};

关于c - inode 实际上是否指向磁盘中的地址？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/29226587/