don't panic if out of disk space when extending a directory.

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/fs.c b/kernel/fs.c
index 247a86f..b220491 100644
--- a/kernel/fs.c
+++ b/kernel/fs.c
@@ -573,6 +573,7 @@ dirlookup(struct inode *dp, char *name, uint *poff)
 }
 
 // Write a new directory entry (name, inum) into the directory dp.
+// Returns 0 on success, -1 on failure (e.g. out of disk blocks).
 int
 dirlink(struct inode *dp, char *name, uint inum)
 {
@@ -597,7 +598,7 @@ dirlink(struct inode *dp, char *name, uint inum)
   strncpy(de.name, name, DIRSIZ);
   de.inum = inum;
   if(writei(dp, 0, (uint64)&de, off, sizeof(de)) != sizeof(de))
-    panic("dirlink");
+    return -1;
 
   return 0;
 }