do not evict dirty blocks

afd34b05 · Nickolai Zeldovich · 8bdfd0b1 · afd34b05 · afd34b05
--- a/bio.c
+++ b/bio.c
@@ -54,7 +54,7 @@ evict(void *vkey, void *bp)
 {
  struct buf *b = bp;
  acquire(&b->lock);
-  if ((b->flags & (B_BUSY | B_VALID)) == 0)
+  if ((b->flags & (B_BUSY | B_DIRTY | B_VALID)) == 0)
    return b;
  release(&b->lock);
  return 0;
@@ -65,7 +65,7 @@ evict_valid(void *vkey, void *bp)
 {
  struct buf *b = bp;
  acquire(&b->lock);
-  if ((b->flags & (B_BUSY)) == 0)
+  if ((b->flags & (B_BUSY | B_DIRTY)) == 0)
    return b;
  release(&b->lock);
  return 0;

--- a/fs.c
+++ b/fs.c
@@ -178,7 +178,7 @@ ialloc(uint dev, short type)
        return ip;
      }
      iunlockput(ip);
-      cprintf("ialloc oops %d\n", inum); // XXX harmless
+      //cprintf("ialloc oops %d\n", inum); // XXX harmless
    }
  }
  panic("ialloc: no inodes");