From 2e85e328864c215c2efa228f129ce3fa6aa1db1f Mon Sep 17 00:00:00 2001 From: cinap_lenrek Date: Tue, 14 Jul 2015 22:23:16 +0200 Subject: 9660srv: keep data and metadata separate in the cache with a tag data on the disk is layed out sequentially and directory information is at the end of the disk. we want to keep data and metadata separated so that reading large sequential files will not evict the directory information from the cache causing long seeks. for that, we tag the clusters (an 8th for metadata, and the rest for data) and getbuf() will only evict clusters of the same tag. --- sys/src/cmd/9660srv/9660srv.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'sys/src/cmd/9660srv/9660srv.c') diff --git a/sys/src/cmd/9660srv/9660srv.c b/sys/src/cmd/9660srv/9660srv.c index 37dbd444b..8fe773d1b 100644 --- a/sys/src/cmd/9660srv/9660srv.c +++ b/sys/src/cmd/9660srv/9660srv.c @@ -69,7 +69,7 @@ iattach(Xfile *root) dp = nil; haveplan9 = 0; for(i=VOLDESC;id, i); + p = getbuf(cd->d, i, 1); v = (Voldesc*)(p->iobuf); if(memcmp(v->byte, "\01CD001\01", 7) == 0){ /* iso */ if(dirp) @@ -372,7 +372,7 @@ iread(Xfile *f, char *buf, vlong offset, long count) while(count > 0){ if(n > count) n = count; - p = getbuf(f->xf->d, addr); + p = getbuf(f->xf->d, addr, 0); memmove(&buf[rcnt], &p->iobuf[o], n); putbuf(p); count -= n; @@ -499,7 +499,7 @@ getdrec(Xfile *f, void *buf) ip->offset += Sectorsize-boff; continue; } - p = getbuf(f->xf->d, addr/Sectorsize); + p = getbuf(f->xf->d, addr/Sectorsize, 1); len = p->iobuf[boff]; if(len >= 34) break; @@ -754,7 +754,7 @@ getcontin(Xdata *dev, uchar *p, uchar **s) off = l32(p+12); len = l32(p+20); chat("getcontin %d...", bn); - b = getbuf(dev, bn); + b = getbuf(dev, bn, 1); if(b == 0){ *s = 0; return 0; -- cgit v1.2.3