Don't panic on failure in ialloc

4eef1217 · Silas Boyd-Wickizer · 6d02373b · 4eef1217 · 4eef1217 · 4eef1217
--- a/bin/mktree.cc
+++ b/bin/mktree.cc
@@ -9,11 +9,12 @@ dolevel(int fd, int branch, int depth)
 {
  if (depth > 0) {
    for (int i = 0; i < branch; i++) {
-      char name = 'a' + i;
+      char name[] = "a";
-      if (mkdirat(fd, &name) < 0)
+      *name += i;
+      if (mkdirat(fd, name) < 0)
        die("mkdirat");
-      int nfd = openat(fd, &name, O_RDONLY);
+      int nfd = openat(fd, name, O_RDONLY);
      if (nfd < 0)
        die("openat");
      dolevel(nfd, branch, depth-1);

--- a/kernel/fs.cc
+++ b/kernel/fs.cc
@@ -185,7 +185,8 @@ ialloc(u32 dev, short type)
      //cprintf("ialloc oops %d\n", inum); // XXX harmless
    }
  }
-  panic("ialloc: no inodes");
+  cprintf("ialloc: no inodes\n");
+  return nullptr;
 }
 // Copy inode, which has changed, from memory to disk.

--- a/kernel/sysfile.cc
+++ b/kernel/sysfile.cc
@@ -228,11 +228,11 @@ create(inode *cwd, const char *path, short type, short major, short minor)
    if(type == T_FILE && ip->type == T_FILE)
      return ip;
    iunlockput(ip);
-    return 0;
+    return nullptr;
  }
-  if((ip = ialloc(dp->dev, type)) == 0)
+  if((ip = ialloc(dp->dev, type)) == nullptr)
-    panic("create: ialloc");
+    return nullptr;
  ip->major = major;
  ip->minor = minor;