kernel: add /srv/clone to get seperate /srv bulletin boards.
This commit is contained in:
Jacob Moody
parent
7ca997bf7e
commit
fa0c807bfb
2 changed files with 358 additions and 88 deletions
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@ -5,6 +5,8 @@ srv \- server registry
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.nf
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.B bind #s /srv
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.BI #s/ clone
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.BI #s/ n
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.BI #s/ service1
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.BI #s/ service2
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...
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@ -12,7 +14,7 @@ srv \- server registry
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.SH DESCRIPTION
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The
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.I srv
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device provides a one-level directory holding
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device provides a tree of directories holding
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already-open channels to services.
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In effect,
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.I srv
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@ -40,6 +42,18 @@ releases that reference.
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.PP
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It is an error to write more than one number into a server file,
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or to create a file with a name that is already being used.
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.PP
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Opening the
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.I clone
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file allocates a new service directory. Reading
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.I clone
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returns the id of the new directory. This new service
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directory can then be accessed at
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.BR /srv/id .
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Directories are recursable; each new service directory
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contains its own
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.I clone
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file.
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.SH EXAMPLE
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To drop one end of a pipe into
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.BR /srv ,
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@ -5,80 +5,249 @@
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#include "fns.h"
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#include "../port/error.h"
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#include "netif.h"
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typedef struct Link Link;
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struct Link
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{
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void *link;
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char *name;
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ulong path;
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};
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typedef struct Srv Srv;
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struct Srv
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{
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char *name;
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Link;
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char *owner;
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ulong perm;
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Chan *chan;
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Srv *link;
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ulong path;
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};
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static QLock srvlk;
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static Srv *srv;
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static int qidpath;
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static Srv*
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srvlookup(char *name, ulong qidpath)
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typedef struct Board Board;
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struct Board
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{
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Srv *sp;
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Link;
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RWlock;
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Ref;
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for(sp = srv; sp != nil; sp = sp->link) {
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if(sp->path == qidpath || (name != nil && strcmp(sp->name, name) == 0))
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return sp;
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Board *parent;
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Board *child;
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Srv *srv;
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long id;
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int qidpath;
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int closed;
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};
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struct{
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QLock;
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long path;
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} boards;
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enum{
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Qroot,
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Qclone,
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Qlease,
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Qend,
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};
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Board root;
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static char Eexpired[] = "expired lease";
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static void*
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lookup(Link *l, char *name, ulong qidpath)
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{
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Link *lp;
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if(qidpath != ~0UL)
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qidpath = NETTYPE(qidpath);
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for(lp = l; lp != nil; lp = lp->link){
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if(qidpath != ~0UL && lp->path == qidpath)
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return lp;
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if(name != nil && strcmp(lp->name, name) == 0)
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return lp;
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}
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return nil;
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}
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static void*
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remove(Link **l, char *name, ulong qidpath)
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{
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Link *lp;
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Link **last;
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if(qidpath != ~0UL)
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qidpath = NETTYPE(qidpath);
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last = l;
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for(lp = *l; lp != nil; lp = lp->link){
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if(qidpath != ~0UL && lp->path == qidpath)
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break;
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if(name != nil && strcmp(lp->name, name) == 0)
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break;
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last = &lp->link;
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}
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if(lp == nil)
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return nil;
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*last = lp->link;
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lp->link = nil;
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return lp;
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}
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static void
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boardclunk(Board *b, int close)
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{
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Srv *sp, *prv;
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Board *ch;
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long ref;
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/* caller holds a wlock */
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if(b == &root){
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wunlock(b);
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return;
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}
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if(close){
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assert(b->closed == 0);
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b->closed++;
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for(sp = b->srv; sp != nil; sp = prv){
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prv = sp->link;
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free(sp->owner);
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free(sp->name);
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if(sp->chan != nil)
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cclose(sp->chan);
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free(sp);
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}
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b->srv = nil;
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}
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ref = decref(b);
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/*
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* All boards must be walkable from root. So a board
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* is allowed to sit at zero references as long as it
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* still has active children. For leaf nodes we then
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* have to walk up the tree to clear now empty parents.
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*/
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while(b->closed && b->child == nil && ref == 0){
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//Root should never be closed
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assert(b->parent != nil);
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wlock(b->parent);
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ch = remove((Link**)&b->parent->child, b->name, b->path);
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assert(ch == b);
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b = ch->parent;
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free(ch->name);
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wunlock(ch);
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free(ch);
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}
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wunlock(b);
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}
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static int
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srvgen(Chan *c, char *name, Dirtab*, int, int s, Dir *dp)
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{
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Srv *sp;
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Board *b, *ch;
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Qid q;
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if(s == DEVDOTDOT){
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devdir(c, c->qid, "#s", 0, eve, 0555, dp);
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return 1;
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}
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if(name != nil && strlen(name) >= sizeof(up->genbuf))
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return -1;
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qlock(&srvlk);
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if(name != nil)
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sp = srvlookup(name, -1);
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else {
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for(sp = srv; sp != nil && s > 0; sp = sp->link)
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s--;
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}
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if(sp == nil || (name != nil && (strlen(sp->name) >= sizeof(up->genbuf)))) {
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qunlock(&srvlk);
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b = c->aux;
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ch = nil;
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mkqid(&q, ~0L, 0, QTFILE);
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rlock(b);
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if(waserror()){
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runlock(b);
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return -1;
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}
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mkqid(&q, sp->path, 0, QTFILE);
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/* make sure name string continues to exist after we release lock */
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kstrcpy(up->genbuf, sp->name, sizeof up->genbuf);
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devdir(c, q, up->genbuf, 0, sp->owner, sp->perm, dp);
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qunlock(&srvlk);
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if(s == DEVDOTDOT){
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ch = b->parent;
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if(ch == nil)
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ch = &root;
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goto Child;
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}
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if(name != nil){
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if(strcmp("clone", name) == 0)
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goto Clone;
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sp = lookup(b->srv, name, ~0UL);
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if(sp == nil)
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ch = lookup(b->child, name, ~0UL);
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} else {
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if(s == 0)
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goto Clone;
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s--;
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for(sp = b->srv; sp != nil && s > 0; sp = sp->link)
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s--;
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for(ch = b->child; ch != nil && s > 0; ch = ch->link)
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s--;
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}
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if(sp != nil){
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kstrcpy(up->genbuf, sp->name, sizeof up->genbuf);
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q.vers = NETID(c->qid.path);
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q.path = NETQID(q.vers, sp->path);
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devdir(c, q, up->genbuf, 0, sp->owner, sp->perm, dp);
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} else if(ch != nil){
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Child:
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kstrcpy(up->genbuf, ch->name, sizeof up->genbuf);
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q.vers = ch->id;
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q.path = NETQID(q.vers, ch->path);
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q.type = QTDIR;
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devdir(c, q, up->genbuf, 0, eve, 0555|DMDIR, dp);
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/* dirread's and stats shouldn't alter c->aux */
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if(name != nil)
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c->aux = ch;
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} else if(0){
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Clone:
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q.vers = NETID(c->qid.path);
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q.path = NETQID(q.vers, Qclone);
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devdir(c, q, "clone", 0, eve, 0444, dp);
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} else
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error(Enonexist);
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runlock(b);
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poperror();
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return 1;
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}
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static void
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srvinit(void)
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{
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qidpath = 1;
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root.qidpath = Qend;
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root.name = "#s";
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}
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static Chan*
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srvattach(char *spec)
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{
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return devattach('s', spec);
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Chan *c;
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c = devattach('s', spec);
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c->aux = &root;
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return c;
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}
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static Walkqid*
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srvwalk(Chan *c, Chan *nc, char **name, int nname)
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{
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return devwalk(c, nc, name, nname, 0, 0, srvgen);
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Board *b;
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Walkqid *wq;
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wq = devwalk(c, nc, name, nname, 0, 0, srvgen);
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if(wq == nil || wq->clone == nil)
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return wq;
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b = wq->clone->aux;
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if(b == &root)
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return wq;
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incref(b);
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return wq;
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}
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static int
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@ -90,12 +259,14 @@ srvstat(Chan *c, uchar *db, int n)
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char*
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srvname(Chan *c)
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{
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Board *b;
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Srv *sp;
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char *s;
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s = nil;
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qlock(&srvlk);
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for(sp = srv; sp != nil; sp = sp->link) {
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b = &root;
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rlock(b);
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for(sp = b->srv; sp != nil; sp = sp->link) {
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if(sp->chan == c){
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s = malloc(3+strlen(sp->name)+1);
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if(s != nil)
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@ -103,15 +274,17 @@ srvname(Chan *c)
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break;
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}
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}
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qunlock(&srvlk);
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runlock(b);
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return s;
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}
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static Chan*
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srvopen(Chan *c, int omode)
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{
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Board *b, *ch;
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Srv *sp;
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Chan *nc;
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char buf[64];
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if(c->qid.type == QTDIR){
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if(omode & ORCLOSE)
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@ -123,20 +296,53 @@ srvopen(Chan *c, int omode)
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c->offset = 0;
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return c;
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}
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qlock(&srvlk);
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if(waserror()){
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qunlock(&srvlk);
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nexterror();
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}
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sp = srvlookup(nil, c->qid.path);
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if(sp == nil || sp->chan == nil)
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error(Eshutdown);
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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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b = c->aux;
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if(NETTYPE(c->qid.path) == Qclone){;
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wlock(b);
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if(b->closed){
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wunlock(b);
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error(Eexpired);
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}
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ch = smalloc(sizeof *ch);
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ch->qidpath = Qend;
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ch->ref = 1;
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do {
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qlock(&boards);
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ch->id = ++boards.path;
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qunlock(&boards);
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snprint(buf, sizeof buf, "%ld", ch->id);
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} while(lookup(b->srv, buf, ~0UL) != nil);
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ch->parent = b;
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ch->path = b->qidpath++;
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kstrdup(&ch->name, buf);
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ch->link = b->child;
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b->child = ch;
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c->aux = ch;
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c->qid.vers = ch->id;
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c->qid.path = NETQID(ch->id, Qlease);
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boardclunk(b, 0); //unlock
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return c;
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}
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rlock(b);
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if(waserror()){
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runlock(b);
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nexterror();
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}
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if(b->closed)
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error(Eexpired);
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sp = lookup(b->srv, nil, c->qid.path);
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if(sp == nil || sp->chan == nil)
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error(Eshutdown);
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if(openmode(omode)!=sp->chan->mode && sp->chan->mode!=ORDWR)
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error(Eperm);
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devpermcheck(sp->owner, sp->perm, omode);
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@ -144,7 +350,7 @@ srvopen(Chan *c, int omode)
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nc = sp->chan;
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incref(nc);
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qunlock(&srvlk);
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runlock(b);
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poperror();
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cclose(c);
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@ -154,6 +360,7 @@ srvopen(Chan *c, int omode)
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static Chan*
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srvcreate(Chan *c, char *name, int omode, ulong perm)
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{
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Board *b;
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Srv *sp;
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if(openmode(omode) != OWRITE)
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@ -166,27 +373,33 @@ srvcreate(Chan *c, char *name, int omode, ulong perm)
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kstrdup(&sp->name, name);
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kstrdup(&sp->owner, up->user);
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qlock(&srvlk);
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b = c->aux;
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wlock(b);
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if(waserror()){
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qunlock(&srvlk);
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wunlock(b);
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free(sp->owner);
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free(sp->name);
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free(sp);
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nexterror();
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}
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if(srvlookup(name, -1) != nil)
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if(b->closed)
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error(Eexpired);
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if(lookup(b->srv, name, ~0UL) != nil)
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error(Eexist);
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if(lookup(b->child, name, ~0UL) != nil)
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error(Eexist);
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sp->perm = perm&0777;
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sp->path = qidpath++;
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sp->path = b->qidpath++;
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c->qid.path = sp->path;
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c->qid.path = NETQID(b->id, sp->path);
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c->qid.vers = b->id;
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c->qid.type = QTFILE;
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sp->link = srv;
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srv = sp;
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sp->link = b->srv;
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b->srv = sp;
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qunlock(&srvlk);
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wunlock(b);
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poperror();
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c->flag |= COPEN;
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@ -198,22 +411,24 @@ srvcreate(Chan *c, char *name, int omode, ulong perm)
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static void
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srvremove(Chan *c)
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{
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Srv *sp, **l;
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Board *b;
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Srv *sp;
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if(c->qid.type == QTDIR)
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error(Eperm);
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switch(NETTYPE(c->qid.path)){
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case Qlease:
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case Qclone:
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error(Eperm);
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}
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qlock(&srvlk);
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b = c->aux;
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wlock(b);
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if(waserror()){
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qunlock(&srvlk);
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wunlock(b);
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nexterror();
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}
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l = &srv;
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for(sp = *l; sp != nil; sp = *l) {
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if(sp->path == c->qid.path)
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break;
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l = &sp->link;
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}
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sp = lookup(b->srv, nil, c->qid.path);
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if(sp == nil)
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error(Enonexist);
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@ -229,10 +444,9 @@ srvremove(Chan *c)
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if((sp->perm&7) != 7 && strcmp(sp->owner, up->user) && !iseve())
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error(Eperm);
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*l = sp->link;
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sp->link = nil;
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remove((Link**)&b->srv, nil, c->qid.path);
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qunlock(&srvlk);
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boardclunk(b, 0); //unlock
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poperror();
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if(sp->chan != nil)
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|
|
@ -245,12 +459,18 @@ srvremove(Chan *c)
|
|||
static int
|
||||
srvwstat(Chan *c, uchar *dp, int n)
|
||||
{
|
||||
Board *b;
|
||||
char *strs;
|
||||
Srv *sp;
|
||||
Dir d;
|
||||
|
||||
if(c->qid.type & QTDIR)
|
||||
error(Eperm);
|
||||
switch(NETTYPE(c->qid.path)){
|
||||
case Qlease:
|
||||
case Qclone:
|
||||
error(Eperm);
|
||||
}
|
||||
|
||||
strs = smalloc(n);
|
||||
if(waserror()){
|
||||
|
|
@ -261,13 +481,16 @@ srvwstat(Chan *c, uchar *dp, int n)
|
|||
if(n == 0)
|
||||
error(Eshortstat);
|
||||
|
||||
qlock(&srvlk);
|
||||
b = c->aux;
|
||||
wlock(b);
|
||||
if(waserror()){
|
||||
qunlock(&srvlk);
|
||||
wunlock(b);
|
||||
nexterror();
|
||||
}
|
||||
if(b->closed)
|
||||
error(Eexpired);
|
||||
|
||||
sp = srvlookup(nil, c->qid.path);
|
||||
sp = lookup(b->srv, nil, c->qid.path);
|
||||
if(sp == nil)
|
||||
error(Enonexist);
|
||||
|
||||
|
|
@ -279,6 +502,10 @@ srvwstat(Chan *c, uchar *dp, int n)
|
|||
error(Ebadchar);
|
||||
if(strlen(d.name) >= sizeof(up->genbuf))
|
||||
error(Etoolong);
|
||||
if(lookup(b->srv, d.name, ~0UL) != nil)
|
||||
error(Eexist);
|
||||
if(lookup(b->child, d.name, ~0UL) != nil)
|
||||
error(Eexist);
|
||||
kstrdup(&sp->name, d.name);
|
||||
}
|
||||
if(d.uid != nil && *d.uid)
|
||||
|
|
@ -286,7 +513,7 @@ srvwstat(Chan *c, uchar *dp, int n)
|
|||
if(d.mode != ~0UL)
|
||||
sp->perm = d.mode & 0777;
|
||||
|
||||
qunlock(&srvlk);
|
||||
wunlock(b);
|
||||
poperror();
|
||||
|
||||
free(strs);
|
||||
|
|
@ -298,22 +525,42 @@ srvwstat(Chan *c, uchar *dp, int n)
|
|||
static void
|
||||
srvclose(Chan *c)
|
||||
{
|
||||
/*
|
||||
* in theory we need to override any changes in removability
|
||||
* since open, but since all that's checked is the owner,
|
||||
* which is immutable, all is well.
|
||||
*/
|
||||
if(c->flag & CRCLOSE){
|
||||
Board *b;
|
||||
int expired;
|
||||
|
||||
expired = 0;
|
||||
if(NETTYPE(c->qid.path) == Qlease)
|
||||
expired++;
|
||||
else if(c->flag & CRCLOSE){
|
||||
/*
|
||||
* in theory we need to override any changes in removability
|
||||
* since open, but since all that's checked is the owner,
|
||||
* which is immutable, all is well.
|
||||
*/
|
||||
if(waserror())
|
||||
return;
|
||||
goto Clunk;
|
||||
srvremove(c);
|
||||
poperror();
|
||||
return;
|
||||
}
|
||||
Clunk:
|
||||
b = c->aux;
|
||||
wlock(b);
|
||||
boardclunk(b, expired); //unlock
|
||||
}
|
||||
|
||||
static long
|
||||
srvread(Chan *c, void *va, long n, vlong)
|
||||
srvread(Chan *c, void *va, long n, vlong off)
|
||||
{
|
||||
Board *b;
|
||||
|
||||
if(NETTYPE(c->qid.path) == Qlease){
|
||||
b = c->aux;
|
||||
rlock(b);
|
||||
n = readstr((ulong)off, va, n, b->name);
|
||||
runlock(b);
|
||||
return n;
|
||||
}
|
||||
isdir(c);
|
||||
return devdirread(c, va, n, 0, 0, srvgen);
|
||||
}
|
||||
|
|
@ -321,11 +568,15 @@ srvread(Chan *c, void *va, long n, vlong)
|
|||
static long
|
||||
srvwrite(Chan *c, void *va, long n, vlong)
|
||||
{
|
||||
Board *b;
|
||||
Srv *sp;
|
||||
Chan *c1;
|
||||
int fd;
|
||||
char buf[32];
|
||||
|
||||
if(NETTYPE(c->qid.path) == Qlease)
|
||||
error(Eperm);
|
||||
|
||||
if(n >= sizeof buf)
|
||||
error(Etoobig);
|
||||
memmove(buf, va, n); /* so we can NUL-terminate */
|
||||
|
|
@ -334,15 +585,18 @@ srvwrite(Chan *c, void *va, long n, vlong)
|
|||
|
||||
c1 = fdtochan(fd, -1, 0, 1); /* error check and inc ref */
|
||||
|
||||
qlock(&srvlk);
|
||||
b = c->aux;
|
||||
wlock(b);
|
||||
if(waserror()) {
|
||||
qunlock(&srvlk);
|
||||
wunlock(b);
|
||||
cclose(c1);
|
||||
nexterror();
|
||||
}
|
||||
if(b->closed)
|
||||
error(Eexpired);
|
||||
if(c1->qid.type & QTAUTH)
|
||||
error("cannot post auth file in srv");
|
||||
sp = srvlookup(nil, c->qid.path);
|
||||
sp = lookup(b->srv, nil, c->qid.path);
|
||||
if(sp == nil)
|
||||
error(Enonexist);
|
||||
|
||||
|
|
@ -351,7 +605,7 @@ srvwrite(Chan *c, void *va, long n, vlong)
|
|||
|
||||
sp->chan = c1;
|
||||
|
||||
qunlock(&srvlk);
|
||||
wunlock(b);
|
||||
poperror();
|
||||
return n;
|
||||
}
|
||||
|
|
@ -380,12 +634,14 @@ Dev srvdevtab = {
|
|||
void
|
||||
srvrenameuser(char *old, char *new)
|
||||
{
|
||||
Board *b;
|
||||
Srv *sp;
|
||||
|
||||
qlock(&srvlk);
|
||||
for(sp = srv; sp != nil; sp = sp->link) {
|
||||
b = &root;
|
||||
wlock(b);
|
||||
for(sp = b->srv; sp != nil; sp = sp->link) {
|
||||
if(sp->owner != nil && strcmp(old, sp->owner) == 0)
|
||||
kstrdup(&sp->owner, new);
|
||||
}
|
||||
qunlock(&srvlk);
|
||||
wunlock(b);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue