836 lines
13 KiB
C
836 lines
13 KiB
C
#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#include "../port/error.h"
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enum {
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Qroot,
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Qcroot,
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Qshr,
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Qcshr,
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Qcmpt,
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};
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typedef struct Ent Ent;
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typedef struct Shr Shr;
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typedef struct Mpt Mpt;
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typedef struct Sch Sch;
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struct Ent
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{
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Ref;
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int id;
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char *name;
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char *owner;
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ulong perm;
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};
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struct Shr
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{
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Ent;
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Mhead umh;
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Shr *next;
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};
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struct Mpt
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{
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Ent;
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Mount m;
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};
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struct Sch
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{
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int level;
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Shr *shr;
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Mpt *mpt;
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Chan *chan;
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};
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static QLock shrslk;
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static Shr *shrs;
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static int shrid;
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static int mptid;
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static Mpt*
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tompt(Mount *m)
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{
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return (Mpt*)((char*)m - (char*)&((Mpt*)0)->m);
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}
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static Sch*
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tosch(Chan *c)
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{
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Sch *sch;
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if(c == nil)
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error("nil chan");
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sch = c->aux;
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if(sch == nil)
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error("nil chan aux");
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if(sch->chan != c)
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error("bad chan");
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return sch;
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}
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static void
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shrinit(void)
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{
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shrid = 1;
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mptid = 1;
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}
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static void
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putmpt(Mpt *mpt)
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{
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if(decref(mpt))
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return;
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if(mpt->m.to != nil)
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cclose(mpt->m.to);
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free(mpt->name);
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free(mpt->owner);
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free(mpt);
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}
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static void
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putshr(Shr *shr)
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{
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if(decref(shr))
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return;
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free(shr->name);
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free(shr->owner);
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free(shr);
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}
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static Qid
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shrqid(int level, int id)
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{
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Qid q;
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q.type = (level == Qcmpt) ? QTFILE : QTDIR;
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q.path = (uvlong)id<<4 | level;
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q.vers = 0;
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return q;
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}
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static Chan*
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shrattach(char *spec)
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{
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Sch *sch;
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Chan *c;
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if(!(spec[0] == 'c' && spec[1] == 0 || spec[0] == 0))
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error(Enoattach);
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c = devattach(L'σ', spec);
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sch = smalloc(sizeof(*sch));
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sch->level = spec[0] == 'c' ? Qcroot : Qroot;
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sch->mpt = nil;
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sch->shr = nil;
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sch->chan = c;
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c->aux = sch;
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c->qid = shrqid(sch->level, 0);
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return c;
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}
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static Chan*
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shrclone(Chan *c)
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{
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Chan *nc;
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Sch *sch, *och;
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och = tosch(c);
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nc = devclone(c);
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sch = smalloc(sizeof(*sch));
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memmove(sch, och, sizeof(*sch));
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if(sch->shr != nil)
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incref(sch->shr);
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if(sch->mpt != nil)
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incref(sch->mpt);
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sch->chan = nc;
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nc->aux = sch;
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return nc;
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}
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static void
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shrclunk(Chan *c)
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{
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Sch *sch;
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sch = tosch(c);
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c->aux = nil;
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sch->chan = nil;
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if(sch->mpt != nil)
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putmpt(sch->mpt);
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if(sch->shr != nil)
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putshr(sch->shr);
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free(sch);
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}
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static Walkqid*
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shrwalk(Chan *c, Chan *nc, char **name, int nname)
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{
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Walkqid *wq, *wq2;
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int alloc, j;
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char *nam;
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Sch *sch;
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Shr *shr;
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Mpt *mpt;
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Mount *m;
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Mhead *h;
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alloc = 0;
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if(nc == nil){
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nc = shrclone(c);
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alloc = 1;
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}
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wq = smalloc(sizeof(Walkqid) + (nname - 1) * sizeof(Qid));
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wq->nqid = 0;
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wq->clone = nc;
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if(waserror()){
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if(alloc)
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cclose(wq->clone);
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if(wq->nqid > 0)
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wq->clone = nil;
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else {
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free(wq);
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wq = nil;
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}
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return wq;
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}
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sch = tosch(nc);
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for(j = 0; j < nname; j++){
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if(nc->qid.type != QTDIR)
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error(Enotdir);
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nam = name[j];
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if(nam[0] == '.' && nam[1] == 0) {
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/* nop */
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} else if(nam[0] == '.' && nam[1] == '.' && nam[2] == 0) {
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switch(sch->level){
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default:
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error(Egreg);
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case Qshr:
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nc->qid = shrqid(sch->level = Qroot, 0);
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break;
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case Qcshr:
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nc->qid = shrqid(sch->level = Qcroot, 0);
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break;
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}
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putshr(sch->shr);
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sch->shr = nil;
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} else if(sch->level == Qcroot || sch->level == Qroot) {
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qlock(&shrslk);
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for(shr = shrs; shr != nil; shr = shr->next)
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if(strcmp(nam, shr->name) == 0){
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incref(shr);
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break;
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}
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qunlock(&shrslk);
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if(shr == nil)
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error(Enonexist);
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sch->level = sch->level == Qcroot ? Qcshr : Qshr;
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sch->shr = shr;
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nc->qid = shrqid(sch->level, shr->id);
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} else if(sch->level == Qcshr) {
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mpt = nil;
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shr = sch->shr;
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h = &shr->umh;
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rlock(&h->lock);
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for(m = h->mount; m != nil; m = m->next){
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mpt = tompt(m);
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if(strcmp(nam, mpt->name) == 0){
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incref(mpt);
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break;
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}
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}
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runlock(&h->lock);
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if(m == nil)
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error(Enonexist);
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sch->mpt = mpt;
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nc->qid = shrqid(sch->level = Qcmpt, mpt->id);
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} else if(sch->level == Qshr) {
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shr = sch->shr;
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h = &shr->umh;
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wq2 = nil;
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rlock(&h->lock);
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for(m = h->mount; m != nil && wq2 == nil; m = m->next){
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if(m->to == nil)
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continue;
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if(waserror())
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continue;
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wq2 = devtab[m->to->type]->walk(m->to, nil, name + j, nname - j);
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poperror();
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}
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runlock(&h->lock);
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if(wq2 == nil)
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error(Enonexist);
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memmove(wq->qid + wq->nqid, wq2->qid, wq2->nqid);
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wq->nqid += wq2->nqid;
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if(alloc)
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cclose(wq->clone);
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wq->clone = wq2->clone;
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free(wq2);
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poperror();
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return wq;
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} else
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error(Egreg);
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wq->qid[wq->nqid++] = nc->qid;
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}
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poperror();
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return wq;
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}
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static int
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shrgen(Chan *c, char*, Dirtab*, int, int s, Dir *dp)
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{
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Mpt *mpt;
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Sch *sch;
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Shr *shr;
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Mhead *h;
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Mount *m;
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sch = tosch(c);
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switch(sch->level){
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default:
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return -1;
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case Qroot:
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case Qcroot:
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qlock(&shrslk);
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for(shr = shrs; shr != nil && s > 0; shr = shr->next)
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s--;
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if(shr == nil){
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qunlock(&shrslk);
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return -1;
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}
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kstrcpy(up->genbuf, shr->name, sizeof up->genbuf);
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if(sch->level == Qroot)
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devdir(c, shrqid(Qshr, shr->id), up->genbuf, 0, shr->owner,
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shr->perm & ~0222, dp);
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else
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devdir(c, shrqid(Qcshr, shr->id), up->genbuf, 0, shr->owner,
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shr->perm, dp);
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qunlock(&shrslk);
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return 1;
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case Qcshr:
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shr = sch->shr;
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h = &shr->umh;
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rlock(&h->lock);
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for(m = h->mount; m != nil && s > 0; m = m->next)
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s--;
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if(m == nil){
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runlock(&h->lock);
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return -1;
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}
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mpt = tompt(m);
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kstrcpy(up->genbuf, mpt->name, sizeof up->genbuf);
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devdir(c, shrqid(Qcmpt, mpt->id), up->genbuf, 0, mpt->owner, mpt->perm, dp);
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runlock(&h->lock);
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return 1;
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}
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}
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static int
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shrstat(Chan *c, uchar *db, int n)
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{
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Sch *sch;
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Dir dir;
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int rc;
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sch = tosch(c);
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switch(sch->level){
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default:
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error(Egreg);
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case Qroot:
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devdir(c, c->qid, "#σ", 0, eve, 0555, &dir);
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break;
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case Qcroot:
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devdir(c, c->qid, "#σc", 0, eve, 0777, &dir);
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break;
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case Qshr:
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devdir(c, c->qid, sch->shr->name, 0, sch->shr->owner, sch->shr->perm & ~0222, &dir);
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break;
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case Qcshr:
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devdir(c, c->qid, sch->shr->name, 0, sch->shr->owner, sch->shr->perm, &dir);
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break;
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case Qcmpt:
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devdir(c, c->qid, sch->mpt->name, 0, sch->mpt->owner, sch->mpt->perm, &dir);
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break;
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}
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rc = convD2M(&dir, db, n);
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if(rc == 0)
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error(Ebadarg);
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return rc;
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}
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static Chan*
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shropen(Chan *c, int omode)
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{
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Chan *nc;
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Sch *sch;
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Shr *shr;
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Mpt *mpt;
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int mode;
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if(c->qid.type == QTDIR && omode != OREAD)
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error(Eisdir);
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mode = openmode(omode);
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sch = tosch(c);
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switch(sch->level){
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default:
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error(Egreg);
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case Qroot:
|
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case Qcroot:
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break;
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case Qshr:
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||
case Qcshr:
|
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shr = sch->shr;
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devpermcheck(shr->owner, shr->perm, mode);
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break;
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case Qcmpt:
|
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if(omode&OTRUNC)
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error(Eexist);
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if(omode&ORCLOSE)
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error(Eperm);
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shr = sch->shr;
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mpt = sch->mpt;
|
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devpermcheck(mpt->owner, mpt->perm, mode);
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rlock(&shr->umh.lock);
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if(mpt->m.to == nil || mpt->m.to->mchan == nil){
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runlock(&shr->umh.lock);
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error(Eshutdown);
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}
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nc = mpt->m.to->mchan;
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incref(nc);
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runlock(&shr->umh.lock);
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if(mode != nc->mode){
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cclose(nc);
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error(Eperm);
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}
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cclose(c);
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return nc;
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}
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c->mode = mode;
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c->flag |= COPEN;
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c->offset = 0;
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return c;
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}
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/* chan.c */
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Chan* createdir(Chan *c, Mhead *m);
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static Chan*
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shrcreate(Chan *c, char *name, int omode, ulong perm)
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{
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Sch *sch;
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||
Shr *shr;
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Mpt *mpt;
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Mhead *h;
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Mount *m;
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Chan *nc;
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int mode;
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||
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mode = openmode(omode);
|
||
sch = tosch(c);
|
||
switch(sch->level){
|
||
case Qcroot:
|
||
case Qcshr:
|
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if(strcmp(up->user, "none") == 0)
|
||
error(Eperm);
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||
}
|
||
switch(sch->level){
|
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default:
|
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error(Eperm);
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case Qshr:
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incref(c);
|
||
if(waserror()){
|
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cclose(c);
|
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nexterror();
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}
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nc = createdir(c, &sch->shr->umh);
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||
poperror();
|
||
if(waserror()){
|
||
cclose(nc);
|
||
nexterror();
|
||
}
|
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nc = devtab[nc->type]->create(nc, name, omode, perm);
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||
poperror();
|
||
cclose(c);
|
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return nc;
|
||
case Qcroot:
|
||
if(!canmount(up->pgrp))
|
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error(Enoattach);
|
||
if((perm & DMDIR) == 0 || mode != OREAD)
|
||
error(Eperm);
|
||
if(strlen(name) >= sizeof(up->genbuf))
|
||
error(Etoolong);
|
||
qlock(&shrslk);
|
||
if(waserror()){
|
||
qunlock(&shrslk);
|
||
nexterror();
|
||
}
|
||
for(shr = shrs; shr != nil; shr = shr->next)
|
||
if(strcmp(name, shr->name) == 0)
|
||
error(Eexist);
|
||
|
||
shr = smalloc(sizeof(*shr));
|
||
incref(shr);
|
||
shr->id = shrid++;
|
||
|
||
kstrdup(&shr->name, name);
|
||
kstrdup(&shr->owner, up->user);
|
||
shr->perm = perm;
|
||
|
||
incref(shr);
|
||
shr->next = shrs;
|
||
shrs = shr;
|
||
|
||
poperror();
|
||
qunlock(&shrslk);
|
||
|
||
c->qid = shrqid(sch->level = Qcshr, shr->id);
|
||
sch->shr = shr;
|
||
break;
|
||
case Qcshr:
|
||
if(!canmount(up->pgrp))
|
||
error(Enoattach);
|
||
if((perm & DMDIR) != 0 || mode != OWRITE)
|
||
error(Eperm);
|
||
|
||
shr = sch->shr;
|
||
if(strcmp(shr->owner, eve) == 0 && !iseve())
|
||
error(Eperm);
|
||
devpermcheck(shr->owner, shr->perm, ORDWR);
|
||
|
||
if(strlen(name) >= sizeof(up->genbuf))
|
||
error(Etoolong);
|
||
|
||
h = &shr->umh;
|
||
wlock(&h->lock);
|
||
if(waserror()){
|
||
wunlock(&h->lock);
|
||
nexterror();
|
||
}
|
||
for(m = h->mount; m != nil; m = m->next){
|
||
mpt = tompt(m);
|
||
if(strcmp(name, mpt->name) == 0)
|
||
error(Eexist);
|
||
}
|
||
|
||
mpt = smalloc(sizeof(*mpt));
|
||
incref(mpt);
|
||
mpt->id = mptid++;
|
||
|
||
kstrdup(&mpt->name, name);
|
||
kstrdup(&mpt->owner, up->user);
|
||
mpt->perm = perm;
|
||
|
||
incref(mpt);
|
||
mpt->m.mflag = (h->mount == nil) ? MCREATE : 0;
|
||
mpt->m.next = h->mount;
|
||
h->mount = &mpt->m;
|
||
|
||
poperror();
|
||
wunlock(&h->lock);
|
||
|
||
c->qid = shrqid(sch->level = Qcmpt, mpt->id);
|
||
sch->mpt = mpt;
|
||
break;
|
||
}
|
||
c->flag |= COPEN;
|
||
c->mode = mode;
|
||
return c;
|
||
}
|
||
|
||
static void
|
||
shrremove(Chan *c)
|
||
{
|
||
Mount *m, **ml;
|
||
Shr *shr, **sl;
|
||
Sch *sch;
|
||
Mpt *mpt;
|
||
Mhead *h;
|
||
Chan *bc;
|
||
|
||
sch = tosch(c);
|
||
if(waserror()){
|
||
shrclunk(c);
|
||
nexterror();
|
||
}
|
||
switch(sch->level){
|
||
default:
|
||
error(Eperm);
|
||
case Qcshr:
|
||
case Qcmpt:
|
||
shr = sch->shr;
|
||
if(!iseve()){
|
||
if(strcmp(shr->owner, eve) == 0)
|
||
error(Eperm);
|
||
devpermcheck(shr->owner, shr->perm, ORDWR);
|
||
}
|
||
}
|
||
switch(sch->level){
|
||
case Qcshr:
|
||
h = &shr->umh;
|
||
qlock(&shrslk);
|
||
rlock(&h->lock);
|
||
if(h->mount != nil){
|
||
runlock(&h->lock);
|
||
qunlock(&shrslk);
|
||
error("directory not empty");
|
||
}
|
||
runlock(&h->lock);
|
||
for(sl = &shrs; *sl != nil; sl = &((*sl)->next))
|
||
if(*sl == shr){
|
||
*sl = shr->next;
|
||
shr->next = nil;
|
||
putshr(shr);
|
||
break;
|
||
}
|
||
qunlock(&shrslk);
|
||
break;
|
||
case Qcmpt:
|
||
bc = nil;
|
||
mpt = sch->mpt;
|
||
m = &mpt->m;
|
||
h = &shr->umh;
|
||
wlock(&h->lock);
|
||
for(ml = &h->mount; *ml != nil; ml = &((*ml)->next))
|
||
if(*ml == m){
|
||
*ml = m->next;
|
||
m->next = nil;
|
||
bc = m->to;
|
||
m->to = nil;
|
||
putmpt(mpt);
|
||
break;
|
||
}
|
||
wunlock(&h->lock);
|
||
if(bc != nil)
|
||
cclose(bc);
|
||
break;
|
||
}
|
||
poperror();
|
||
shrclunk(c);
|
||
}
|
||
|
||
static int
|
||
shrwstat(Chan *c, uchar *dp, int n)
|
||
{
|
||
char *strs;
|
||
Mhead *h;
|
||
Sch *sch;
|
||
Ent *ent;
|
||
Dir d;
|
||
|
||
strs = smalloc(n);
|
||
if(waserror()){
|
||
free(strs);
|
||
nexterror();
|
||
}
|
||
n = convM2D(dp, n, &d, strs);
|
||
if(n == 0)
|
||
error(Eshortstat);
|
||
|
||
h = nil;
|
||
sch = tosch(c);
|
||
switch(sch->level){
|
||
default:
|
||
error(Eperm);
|
||
case Qcshr:
|
||
ent = sch->shr;
|
||
qlock(&shrslk);
|
||
if(waserror()){
|
||
qunlock(&shrslk);
|
||
nexterror();
|
||
}
|
||
break;
|
||
case Qcmpt:
|
||
ent = sch->mpt;
|
||
h = &sch->shr->umh;
|
||
wlock(&h->lock);
|
||
if(waserror()){
|
||
wunlock(&h->lock);
|
||
nexterror();
|
||
}
|
||
break;
|
||
}
|
||
|
||
if(strcmp(ent->owner, up->user) && !iseve())
|
||
error(Eperm);
|
||
|
||
if(d.name != nil && *d.name && strcmp(ent->name, d.name) != 0) {
|
||
if(strchr(d.name, '/') != nil)
|
||
error(Ebadchar);
|
||
if(strlen(d.name) >= sizeof(up->genbuf))
|
||
error(Etoolong);
|
||
kstrdup(&ent->name, d.name);
|
||
}
|
||
if(d.uid != nil && *d.uid)
|
||
kstrdup(&ent->owner, d.uid);
|
||
if(d.mode != ~0UL)
|
||
ent->perm = d.mode & 0777;
|
||
|
||
switch(sch->level){
|
||
case Qcshr:
|
||
poperror();
|
||
qunlock(&shrslk);
|
||
break;
|
||
case Qcmpt:
|
||
poperror();
|
||
wunlock(&h->lock);
|
||
break;
|
||
}
|
||
|
||
poperror();
|
||
free(strs);
|
||
|
||
return n;
|
||
}
|
||
|
||
static long
|
||
shrread(Chan *c, void *va, long n, vlong)
|
||
{
|
||
Mhead *omh;
|
||
Sch *sch;
|
||
|
||
sch = tosch(c);
|
||
switch(sch->level){
|
||
default:
|
||
error(Egreg);
|
||
case Qroot:
|
||
case Qcroot:
|
||
case Qcshr:
|
||
return devdirread(c, va, n, 0, 0, shrgen);
|
||
case Qshr:
|
||
omh = c->umh;
|
||
c->umh = &sch->shr->umh;
|
||
if(waserror()){
|
||
c->umh = omh;
|
||
nexterror();
|
||
}
|
||
n = unionread(c, va, n);
|
||
poperror();
|
||
c->umh = omh;
|
||
return n;
|
||
}
|
||
}
|
||
|
||
static long
|
||
shrwrite(Chan *c, void *va, long n, vlong)
|
||
{
|
||
Sch *sch;
|
||
char *buf, *p, *aname;
|
||
int fd;
|
||
Chan *bc, *c0;
|
||
Mhead *h;
|
||
Mount *m;
|
||
|
||
if(!canmount(up->pgrp))
|
||
error(Enoattach);
|
||
sch = tosch(c);
|
||
if(sch->level != Qcmpt)
|
||
error(Egreg);
|
||
|
||
buf = smalloc(n+1);
|
||
if(waserror()){
|
||
free(buf);
|
||
nexterror();
|
||
}
|
||
memmove(buf, va, n);
|
||
buf[n] = 0;
|
||
|
||
fd = strtol(buf, &p, 10);
|
||
if(p == buf || (*p != 0 && *p != '\n'))
|
||
error(Ebadarg);
|
||
if(*p == '\n' && *(p+1) != 0)
|
||
aname = p + 1;
|
||
else
|
||
aname = nil;
|
||
|
||
bc = fdtochan(fd, ORDWR, 0, 1);
|
||
if(waserror()) {
|
||
cclose(bc);
|
||
nexterror();
|
||
}
|
||
c0 = mntattach(bc, nil, aname, 0);
|
||
poperror();
|
||
cclose(bc);
|
||
poperror();
|
||
free(buf);
|
||
|
||
if(c0 == nil)
|
||
error(Egreg);
|
||
|
||
m = &sch->mpt->m;
|
||
h = &sch->shr->umh;
|
||
wlock(&h->lock);
|
||
bc = m->to;
|
||
m->to = c0;
|
||
wunlock(&h->lock);
|
||
|
||
if(bc != nil)
|
||
cclose(bc);
|
||
|
||
return n;
|
||
}
|
||
|
||
static void
|
||
shrclose(Chan *c)
|
||
{
|
||
if(c->flag & CRCLOSE)
|
||
shrremove(c);
|
||
else
|
||
shrclunk(c);
|
||
}
|
||
|
||
Dev shrdevtab = {
|
||
L'σ',
|
||
"shr",
|
||
|
||
devreset,
|
||
shrinit,
|
||
devshutdown,
|
||
shrattach,
|
||
shrwalk,
|
||
shrstat,
|
||
shropen,
|
||
shrcreate,
|
||
shrclose,
|
||
shrread,
|
||
devbread,
|
||
shrwrite,
|
||
devbwrite,
|
||
shrremove,
|
||
shrwstat,
|
||
};
|
||
|
||
static void
|
||
chowner(Ent *ent, char *old, char *new)
|
||
{
|
||
if(ent->owner != nil && strcmp(old, ent->owner) == 0)
|
||
kstrdup(&ent->owner, new);
|
||
}
|
||
|
||
void
|
||
shrrenameuser(char *old, char *new)
|
||
{
|
||
Shr *shr;
|
||
Mount *m;
|
||
|
||
qlock(&shrslk);
|
||
for(shr = shrs; shr != nil; shr = shr->next){
|
||
wlock(&shr->umh.lock);
|
||
for(m = shr->umh.mount; m != nil; m = m->next)
|
||
chowner(tompt(m), old, new);
|
||
wunlock(&shr->umh.lock);
|
||
chowner(shr, old, new);
|
||
}
|
||
qunlock(&shrslk);
|
||
}
|