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Annotation of linux/fs/ext/chrdev.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *  linux/fs/ext/chrdev.c
        !             3:  *
        !             4:  *  (C) 1992  Remy Card ([email protected])
        !             5:  *
        !             6:  *  from
        !             7:  *
        !             8:  *  linux/fs/minix/chrdev.c
        !             9:  *
        !            10:  *  (C) 1991  Linus Torvalds
        !            11:  */
        !            12: 
        !            13: #include <linux/sched.h>
        !            14: #include <linux/ext_fs.h>
        !            15: #include <linux/tty.h>
        !            16: #include <linux/stat.h>
        !            17: #include <linux/fcntl.h>
        !            18: 
        !            19: #include <errno.h>
        !            20: 
        !            21: /*
        !            22:  * Called every time an ext character special file is opened
        !            23:  */
        !            24: static int chrdev_open(struct inode * inode, struct file * filp)
        !            25: {
        !            26:        int i;
        !            27: 
        !            28:        i = MAJOR(inode->i_rdev);
        !            29:        if (i < MAX_CHRDEV) {
        !            30:                filp->f_op = chrdev_fops[i];
        !            31:                if (filp->f_op && filp->f_op->open)
        !            32:                        return filp->f_op->open(inode,filp);
        !            33:        }
        !            34:        return 0;
        !            35: }
        !            36: 
        !            37: /*
        !            38:  * Dummy default file-operations: the only thing this does
        !            39:  * is contain the open that then fills in the correct operations
        !            40:  * depending on the special file...
        !            41:  */
        !            42: static struct file_operations def_chr_fops = {
        !            43:        NULL,           /* lseek */
        !            44:        NULL,           /* read */
        !            45:        NULL,           /* write */
        !            46:        NULL,           /* readdir */
        !            47:        NULL,           /* select */
        !            48:        NULL,           /* ioctl */
        !            49:        chrdev_open,    /* open */
        !            50:        NULL,           /* release */
        !            51: };
        !            52: 
        !            53: struct inode_operations ext_chrdev_inode_operations = {
        !            54:        &def_chr_fops,          /* default file operations */
        !            55:        NULL,                   /* create */
        !            56:        NULL,                   /* lookup */
        !            57:        NULL,                   /* link */
        !            58:        NULL,                   /* unlink */
        !            59:        NULL,                   /* symlink */
        !            60:        NULL,                   /* mkdir */
        !            61:        NULL,                   /* rmdir */
        !            62:        NULL,                   /* mknod */
        !            63:        NULL,                   /* rename */
        !            64:        NULL,                   /* readlink */
        !            65:        NULL,                   /* follow_link */
        !            66:        ext_bmap,               /* bmap */
        !            67:        ext_truncate            /* truncate */
        !            68: };
        !            69: 

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