ref: 75c92428225428c8fde2d015f010e608a0b12f1d
dir: /liblogfs/create.c/
#include "logfsos.h" #include "logfs.h" #include "local.h" char * logfsservercreate(LogfsServer *server, u32int fid, char *name, u32int perm, uchar mode, Qid *qid) { Fid *f; char *uid; ulong newpath; char *errmsg; Entry *e, *xe, *pe; Path *pp; LogMessage s; if(server->trace > 1) print("logfsservercreate(%ud, %s, 0%uo, %.2ux)\n", fid, name, perm, mode); f = logfsfidmapfindentry(server->fidmap, fid); if(f == nil) return logfsebadfid; if(f->openmode >= 0) return logfsefidopen; pe = f->entry; if((pe->qid.type & QTDIR) == 0) return Enotdir; if((perm & DMDIR) != 0 && ((mode & OTRUNC) != 0 || (mode & 3) != OREAD)) return Eperm; if(!logfsuserpermcheck(server, pe, f, DMWRITE)) return Eperm; /* * illegal names */ if(strcmp(name, ".") == 0 || strcmp(name, "..") == 0) return Eperm; for(xe = pe->u.dir.list; xe; xe = xe->next) if(strcmp(xe->name, name) == 0) return Eexist; newpath = ++server->path; while(logfspathmapfindentry(server->pathmap, newpath)) newpath++; /* shouldn't happen */ uid = logfsisfindidfromname(server->is, f->uname); errmsg = logfsentrynew(server, 1, newpath, pe, name, uid, f->entry->gid, logfsnow(), uid, perm, 0, 0, &e); if(errmsg) return errmsg; errmsg = logfspathmapnewentry(server->pathmap, newpath, e, &pp); /* pp is guaranteed to be non-null */ if(errmsg) { logfsfreemem(e); return errmsg; } s.type = LogfsLogTcreate; s.path = e->parent->qid.path; s.u.create.perm = e->perm; s.u.create.newpath = e->qid.path; s.u.create.mtime = e->mtime; /* TODO - check with forsyth whether cvers is needed in dirs */ s.u.create.cvers = (e->qid.type & QTDIR) ? 0 : e->u.file.cvers; s.u.create.name = e->name; s.u.create.uid = e->uid; s.u.create.gid = e->gid; errmsg = logfslog(server, 1, &s); if(errmsg) { logfsfreemem(e); logfspathmapdeleteentry(server->pathmap, newpath); return errmsg; } server->path = newpath; e->inuse++; e->qid.vers++; e->next = pe->u.dir.list; pe->u.dir.list = e; f->openmode = mode; /* * TODO why does forsyth increment inuse for dir? - we're moving the fid onto the new file * so a decrement seems better */ logfsentryclunk(pe); f->entry = e; *qid = e->qid; return nil; }