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devshr: added unmounting

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This commit is contained in:
aiju 2011-07-24 14:51:49 +02:00
parent f882472d0b
commit e1260aa4d6
1 changed files with 50 additions and 5 deletions
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55
sys/src/9/port/devshr.c
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@ -103,6 +103,35 @@ shrlookup(char *name, ulong qidpath)
return nil;
}
static int
shrremovemnt(Shr *sp, int id)
{
Mount *m, **l;
wlock(&sp->umh.lock);
l = &sp->umh.mount;
for(m = *l; m; m = m->next){
if(m->mountid == id){
cclose(m->to);
*l = m->next;
free(m);
break;
}
l = &m->next;
}
if(m == nil){
wunlock(&sp->umh.lock);
return -1;
}
qlock(&sp->desclock);
free(sp->desc);
sp->desc = nil;
qunlock(&sp->desclock);
wunlock(&sp->umh.lock);
return 0;
}
static Walkqid*
shrwalk(Chan *c, Chan *nc, char **name, int nname)
{
@ -360,7 +389,7 @@ shrremove(Chan *c)
if(strcmp(sp->owner, eve) == 0 && !iseve())
error(Eperm);
if((sp->perm&7) != 7 && strcmp(sp->owner, up->user) && !iseve())
if((sp->perm&7) != 7 && strcmp(sp->owner, up->user) != 0 && !iseve())
error(Eperm);
*l = sp->link;
@ -454,7 +483,7 @@ shrread(Chan *c, void *va, long n, vlong off)
rlock(&sp->umh.lock);
for(f = sp->umh.mount; f != nil; f = f->next)
nn += 32 + strlen((char*)(f + 1));
s = sp->desc = smalloc(nn);
s = sp->desc = smalloc(nn + 1);
e = s + nn;
for(f = sp->umh.mount; f != nil; f = f->next)
s = seprint(s, e, "%lud %s %C %lud %lld\n", f->mountid, (char*)(f + 1), devtab[f->to->mchan->type]->dc, f->to->mchan->dev, f->to->qid.path);
@ -470,7 +499,7 @@ shrwrite(Chan *c, void *va, long n, vlong)
{
Shr *sp;
char *buf, *p, *desc, *aname;
int mode, fd;
int mode, fd, id;
Chan *bc, *c0;
Mount *m, *mm;
struct{
@ -501,6 +530,22 @@ shrwrite(Chan *c, void *va, long n, vlong)
memmove(buf, va, n);
buf[n] = 0;
if(*buf == 'u'){
p = buf + 1;
while(*p <= ' ' && *p != '\n')
p++;
if(*p == 0 || *p == '\n')
error(Ebadarg);
id = strtol(p, 0, 10);
if(shrremovemnt(sp, id) < 0)
error(Ebadarg);
shrdecref(sp);
free(buf);
poperror();
poperror();
return n;
}
p = buf;
mode = 0;
for(; *p > ' '; p++)
@ -514,9 +559,9 @@ shrwrite(Chan *c, void *va, long n, vlong)
if((mode & (MAFTER|MBEFORE)) == 0 || (mode & (MAFTER|MBEFORE)) == (MAFTER|MBEFORE))
error(Ebadarg);
while(*p <= ' ')
while(*p <= ' ' && *p != '\n')
p++;
if(*p == 0)
if(*p == 0 || *p == '\n')
error(Ebadarg);
fd = strtol(p, &p, 10);
while(*p <= ' ' && *p != '\n')