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Annotation of researchv10no/sys/fs/errfs.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * error file system:
                      3:  * substituted for the original file system in inodes which
                      4:  * someone still has open but which are unwanted;
                      5:  * e.g. forcing an unmount of a file system with open files outstanding
                      6:  * the various operations are all either no-ops
                      7:  * or return errors
                      8:  * t_put is explicitly a no-op.
                      9:  * the idea is to prevent any real I/O,
                     10:  * but allow the offending inodes to hang around
                     11:  * until finally put
                     12:  */
                     13: #include "sys/param.h"
                     14: #include "sys/user.h"
                     15: #include "sys/conf.h"
                     16: #include "sys/inode.h"
                     17: 
                     18: int errnami();
                     19: struct fstypsw erfs = fsinit(nulldev, nulldev, nodev, nodev,
                     20:        nodev, nodev, errnami, nodev, nodev, nullopen, nodev);
                     21: 
                     22: errnami(p, fp, follow)
                     23: register struct nx *p;
                     24: struct flagp *fp;
                     25: int follow;
                     26: {
                     27:        u.u_error = ENODEV;
                     28:        iput(p->dp);
                     29:        p->dp = NULL;
                     30:        return (0);
                     31: }

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