12 Jan
2017
12 Jan
'17
4:39 p.m.
Larry McVoy <lm(a)mcvoy.com> wrote:
I really wonder where you got your information from
because it's a
little bit wrong.
Do you really believe I invented all these people? You already confirmed that
they exist. How do you believe, I could get the names without being in contact
with them?
I got my information from working on Solaris and in this special case, you seem
to forget that you definitely made a mistake. Maybe you now like to refresh
your memory....
From Solaris sys/vfs.h:
/*
* Filesystem type switch table.
*/
typedef struct vfssw {
char *vsw_name; /* type name -- max len _ST_FSTYPSZ */
int (*vsw_init) (int, char *);
/* init routine (for non-loadable fs only) */
int vsw_flag; /* flags */
mntopts_t vsw_optproto; /* mount options table prototype */
uint_t vsw_count; /* count of references */
kmutex_t vsw_lock; /* lock to protect vsw_count */
vfsops_t vsw_vfsops; /* filesystem operations vector */
} vfssw_t;
I however have to admit that I did also a mistake as struct vfssw just
contains the structure vfsops_t and is not the structure I had in mind itself.
But it is based on struct vfssw from SunOS-4 sys/vfs.h which looks this way:
/*
* Filesystem type switch table
*/
struct vfssw {
char *vsw_name; /* type name string */
struct vfsops *vsw_ops; /* filesystem operations vector */
};
It seems that "porting" it to Svr4 caused a dot to be appended to the
comment ;-)
BTW: in 1990 with SunOS-4.0, I could already modload my "wofs" as I added a few
nulled entries to the struct vfssw in os/vfs_conf.c, pretended that wofs was a
device driver and let it then install itself into one of the empty entries in
struct vfssw.
Jörg
--
EMail:joerg@schily.net (home) Jörg Schilling D-13353 Berlin
joerg.schilling(a)fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
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