hjfs: eleminate seek syscalls

[plan9front.git] / sys / src / cmd / hjfs / dev.c

diff --git a/sys/src/cmd/hjfs/dev.c b/sys/src/cmd/hjfs/dev.c
index 45c3a9e09f8e4d30682aa54d0902deaef507024f..4826b4bdd8a160f5385222ff2fcb728b656c2c65 100644 (file)
--- a/sys/src/cmd/hjfs/dev.c
+++ b/sys/src/cmd/hjfs/dev.c
@@ -30,20 +30,27 @@ devwork(void *v)
                        b->error = Einval;
                        goto reply;
                }
-               seek(d->fd, b->off * BLOCK, 0);
                b->error = nil;
                if(b->op & BWRITE){
                        memset(buf, 0, sizeof(buf));
                        pack(b, buf);
-                       if(write(d->fd, buf, BLOCK) < BLOCK){
+                       if(pwrite(d->fd, buf, BLOCK, b->off*BLOCK) < BLOCK){
                                dprint("hjfs: write: %r\n");
                                b->error = Eio;
                        }
                }else{
-                       if(readn(d->fd, buf, BLOCK) < 0){
-                               dprint("hjfs: read: %r\n");
+                       int n, m;
+
+                       for(n = 0; n < BLOCK; n += m){
+                               m = pread(d->fd, buf+n, BLOCK-n, b->off*BLOCK+n);
+                               if(m < 0)
+                                       dprint("hjfs: read: %r\n");
+                               if(m <= 0)
+                                       break;
+                       }
+                       if(n < BLOCK)
                                b->error = Eio;
-                       }else
+                       else
                                unpack(b, buf);
                }
        reply: