ref: 75c92428225428c8fde2d015f010e608a0b12f1d
dir: /liblogfs/srv.c/
#include "logfsos.h" #include "logfs.h" #include "fcall.h" #include "local.h" static char *unimp = "unimplemented"; char *logfsbadfid = "invalid fid"; char * logfsstrdup(char *p) { int l; char *q; if(p == nil) return nil; l = strlen(p); q = logfsrealloc(nil, l + 1); if(q == nil) return nil; return strcpy(q, p); } static mkdirentry(LogfsServer *server, Entry *e, int inuse, ulong path, Entry *parent, char *name, char *uid, char *gid, ulong mtime, char *muid, ulong perm) { //print("mkdirentry 0x%.8lux\n", e); e->inuse = inuse; e->qid.path = path; e->qid.vers = 0; e->qid.type = QTDIR; e->parent = parent; e->name = name; e->uid = logfsisustadd(server->is, uid); e->gid = logfsisustadd(server->is, gid); e->mtime = mtime; e->muid = logfsisustadd(server->is, muid); e->perm = perm | DMDIR; e->next = nil; return e->uid != nil && e->muid != nil && e->name != nil; } void logfsentryfree(Entry *e) { logfsfreemem(e->name); if((e->qid.type & QTDIR) == 0) logfsextentlistfree(&e->u.file.extent); logfsfreemem(e); } char * logfsentrynew(LogfsServer *server, int inuse, u32int path, Entry *parent, char *name, char *uid, char *gid, u32int mtime, char *muid, u32int perm, ulong cvers, ulong length, Entry **ep) { Entry *e; char *errmsg; e = logfsrealloc(nil, sizeof(*e)); if(e == nil) return Enomem; e->inuse = inuse; e->qid.path = path; e->qid.vers = 0; e->qid.type = perm >> 24; e->parent = parent; e->name = logfsstrdup(name); e->uid = logfsisustadd(server->is, uid); e->gid = logfsisustadd(server->is, gid); e->muid = logfsisustadd(server->is, muid); if(e->uid == nil || e->gid == nil || e->muid == nil || e->name == nil) { logfsentryfree(e); return Enomem; } e->mtime = mtime; if(perm & DMDIR) e->perm = perm & (~0777 | (parent->perm & 0777)); else { e->perm = perm & (~0666 | (parent->perm & 0666)); e->u.file.cvers = cvers; e->u.file.length = length; errmsg = logfsextentlistnew(&e->u.file.extent); if(errmsg) { logfsentryfree(e); return errmsg; } } //print("e 0x%.8lux perm 0%.uo\n", e, e->perm); *ep = e; return nil; } void logfsentryclunk(Entry *e) { e->inuse--; if(e->inuse <= 0) logfsentryfree(e); } char * logfsservernew(LogfsBoot *lb, LogfsLowLevel *ll, LogfsIdentityStore *is, ulong openflags, int trace, LogfsServer **srvp) { LogfsServer *srv; char *errmsg; Path *p; if(trace > 1) print("logfsservernew()\n"); if(ll->l2pagesperblock > 5) return "more than 32 pages per block"; if((1 << (ll->pathbits - L2LogSweeps - L2BlockCopies)) < ll->blocks) return "too many blocks"; srv = logfsrealloc(nil, sizeof(*srv)); if(srv == nil) { memerror: errmsg = Enomem; err: logfsserverfree(&srv); return errmsg; } errmsg = logfsfidmapnew(&srv->fidmap); if(errmsg) goto memerror; errmsg = logfspathmapnew(&srv->pathmap); if(errmsg) goto memerror; srv->is = is; srv->ll = ll; srv->trace = trace; srv->lb = lb; srv->openflags = openflags; if(!mkdirentry(srv, &srv->root, 1, 0, &srv->root, "", "inferno", "sys", logfsnow(), "inferno", 0777)) goto memerror; errmsg = logfspathmapnewentry(srv->pathmap, 0, &srv->root, &p); /* p is guaranteed to be non null */ if(errmsg) goto memerror; errmsg = logfslogsegmentnew(srv, 0, &srv->activelog); if(errmsg) goto memerror; srv->ndatablocks = 0; srv->datablock = logfsrealloc(nil, sizeof(DataBlock) * ll->blocks); if(srv->datablock == nil) goto memerror; errmsg = logfsscan(srv); if(errmsg) goto err; errmsg = logfsreplay(srv, srv->sweptlog, 0); if(errmsg) goto err; errmsg = logfsreplay(srv, srv->activelog, srv->sweptlog != nil); if(errmsg) goto err; logfsreplayfinddata(srv); *srvp = srv; return nil; } static void freeentrylist(Entry *e) { Entry *next; while(e) { next = e->next; if(e->qid.type & QTDIR) freeentrylist(e->u.dir.list); logfsentryfree(e); e = next; } } void logfsserverfree(LogfsServer **serverp) { LogfsServer *server = *serverp; if(server) { logfsfidmapfree(&server->fidmap); logfslogsegmentfree(&server->activelog); logfslogsegmentfree(&server->sweptlog); logfspathmapfree(&server->pathmap); logfsfreemem(server->datablock); logfsfreemem(server); freeentrylist(server->root.u.dir.list); *serverp = nil; } } char * logfsserverattach(LogfsServer *server, u32int fid, char *uname, Qid *qid) { char *errmsg; Fid *f; if(server->trace > 1) print("logfsserverattach(%ud, %s)\n", fid, uname); errmsg = logfsfidmapnewentry(server->fidmap, fid, &f); if(errmsg) return errmsg; f->uname = logfsisustadd(server->is, uname); if(f->uname == nil) { logfsfidmapclunk(server->fidmap, fid); return Enomem; } f->entry = &server->root; f->entry->inuse++; *qid = f->entry->qid; return nil; } static void id2name(LogfsIdentityStore *is, char *id, char **namep, int *badp, int *lenp) { char *name; if(id == logfsisgroupnonename) name = id; else { name = logfsisfindnamefromid(is, id); if(name == nil) { *badp = 2; name = id; } } *lenp = strlen(name); *namep = name; } u32int logfsflattenentry(LogfsIdentityStore *is, uchar *buf, u32int limit, Entry *e) { int unamelen, gnamelen, munamelen, namelen; uint len; uchar *p; int unamebad = 0, gnamebad = 0, munamebad = 0; char *uname, *gname, *muname; id2name(is, e->uid, &uname, &unamebad, &unamelen); id2name(is, e->gid, &gname, &gnamebad, &gnamelen); id2name(is, e->muid, &muname, &munamebad, &munamelen); namelen = strlen(e->name); len = 49 + unamelen + unamebad + gnamelen + gnamebad + munamelen + munamebad + namelen; if(buf == nil) return len; if(len > limit) return 0; p = buf; /* size */ PBIT16(p, len - BIT16SZ); p += BIT16SZ; /* type */ p += BIT16SZ; /* dev */ p += BIT32SZ; /* qid.type */ *p++ = e->qid.type; /* qid.vers */ PBIT32(p, e->qid.vers); p += BIT32SZ; /* qid.path */ PBIT64(p, e->qid.path); p+= 8; /* mode */ PBIT32(p, e->perm); p+= BIT32SZ; /* atime */ PBIT32(p, e->mtime); p+= BIT32SZ; /* mtime */ PBIT32(p, e->mtime); p+= BIT32SZ; /* length */ if(e->qid.type & QTDIR) { PBIT64(p, 0); p += 8; } else { PBIT32(p, e->u.file.length); p += BIT32SZ; PBIT32(p, 0); p += BIT32SZ; } /* name */ PBIT16(p, namelen); p += BIT16SZ; memmove(p, e->name, namelen); p+= namelen; /* uid */ PBIT16(p, unamelen + unamebad); p += BIT16SZ; if(unamebad) *p++ = '('; memmove(p, uname, unamelen + unamebad); p+= unamelen; if(unamebad) *p++ = ')'; /* gid */ PBIT16(p, gnamelen + gnamebad); p += BIT16SZ; if(gnamebad) *p++ = '('; memmove(p, gname, gnamelen); p+= gnamelen; if(gnamebad) *p++ = ')'; /* muid */ PBIT16(p, munamelen + munamebad); p += BIT16SZ; if(munamebad) *p++ = '('; memmove(p, muname, munamelen); p+= munamelen; if(munamebad) *p = ')'; //print("len %ud p - buf %ld\n", len, p - buf); return len; } char * logfsserverstat(LogfsServer *server, u32int fid, uchar *buf, u32int bufsize, ushort *nstat) { Fid *f; if(server->trace > 1) print("logfsserverstat(%ud)\n", fid); f = logfsfidmapfindentry(server->fidmap, fid); if(f == nil) return logfsbadfid; if(f->entry->deadandgone) return Eio; *nstat = logfsflattenentry(server->is, buf, bufsize, f->entry); if(*nstat == 0) return Eshortstat; return nil; } void logfsservertrace(LogfsServer *server, int level) { server->trace = level; }