ref: a566629485f872d51d4d5661d8b4aa32bd45f3e2
parent: 7754c42469ca6f6dff350f2d87e0903a5ce61c00
author: 9ferno <[email protected]>
date: Sun Oct 16 16:42:23 EDT 2022
do not write to new blocks if the number of blocks has not changed
--- a/9p.c
+++ b/9p.c
@@ -449,17 +449,6 @@
Fid *fid;
Spanid s;
-/* if(chatty9p > 1)
- dprint("< %ld mafscreate c->path %s req->ifcall.name %s\n"- " c->mode 0x%ux mode 0x%ux perm 0x%lux\n"
- " c->qid.path 0x%zux c->qid.vers %lud c->qid.type %ud 0x%ux\n"
- " c->aux 0x%p t->idx %d dblkno %llud\n",
- time(nil),
- chanpath(c), req->ifcall.name, c->mode, omode, perm,
- c->qid.path,
- c->qid.vers, c->qid.type, c->qid.type,
- c->aux, aux->t->idx, aux->dblkno);*/
-
/* no create's when shutting down */
if(shuttingdown){respond(req, errstring[Eshutdown]);
@@ -613,12 +602,6 @@
return;
}
putbuf(dbuf);
- /* DBG("> mafscreate c->path %s mode 0x%ux omode0 0x%ux\n"- " c->qid.path 0x%zux c->qid.vers %lud c->qid.type %d 0x%ux\n"
- " c->aux 0x%p\n",
- chanpath(c), c->mode, omode, c->qid.path,
- c->qid.vers, c->qid.type, c->qid.type,
- c->aux); */
respond(req, nil);
return;
}else{@@ -1288,12 +1271,12 @@
}
return howmuch;
}else{- /* last extent is partially full */
+ /* last Span is partially full */
/*
- get the old extent and the new extent
- copy from the old extent to the new
- addrelative the new extent
- free the old extent */
+ get the old Span and the new Span
+ copy from the old Span to the new
+ addrelative the new Span
+ free the old Span */
rel2abs(d, d->size/Maxspansize, &s);
blkno = s.blkno;
@@ -1318,6 +1301,18 @@
if((lastspansize+wbufsize+sizeof(Tag))%Rawblocksize > 0)
newnblocks++;
}
+
+ /* Filling up the old Span. No new blocks are added. */
+ if(oldnblocks == newnblocks){+ howmuch = min(Maxspansize-lastspansize, wbufsize);
+ if(chatty9p > 1)
+ dprint("fill lastspansize %llud nblocks %llud howmuch %llud\n",+ lastspansize, newnblocks, howmuch);
+ memcpy(buf->io->buf+lastspansize, wbuf, howmuch);
+ putbuf(buf);
+ return howmuch;
+ }
+
nbuf = allocblocks(newnblocks, Tdata, d->qid.path);
if(nbuf == nil){putbuf(buf);