From 05e975511bcf7f33955208319655dbfc687a7b0c Mon Sep 17 00:00:00 2001
From: rtm <rtm>
Date: Sat, 12 Aug 2006 22:44:26 +0000
Subject: [PATCH] zero out all of dirent.name when creating don't increase
 length of directory

---
 Notes  |  4 ++--
 bio.c  |  4 ++--
 defs.h |  2 +-
 fs.c   | 27 +++++++++++++++------------
 4 files changed, 20 insertions(+), 17 deletions(-)

diff --git a/Notes b/Notes
index 7d8ac14..7e3edd5 100644
--- a/Notes
+++ b/Notes
@@ -363,5 +363,5 @@ more than one directory content block
 sh arguments
 sh redirection
 indirect blocks
-two bugs in unlink
-how come unlink xxx fails? iput problem?
+two bugs in unlink: don't just return if nlink > 0,
+  and search for name, not inum
diff --git a/bio.c b/bio.c
index e344343..251f2f9 100644
--- a/bio.c
+++ b/bio.c
@@ -90,13 +90,13 @@ bread(uint dev, uint sector)
 }
 
 void
-bwrite(uint dev, struct buf *b, uint sector)
+bwrite(struct buf *b, uint sector)
 {
   void *c;
   extern struct spinlock ide_lock;
 
   acquire(&ide_lock);
-  c = ide_start_rw(dev & 0xff, sector, b->data, 1, 0);
+  c = ide_start_rw(b->dev & 0xff, sector, b->data, 1, 0);
   sleep (c, &ide_lock);
   ide_finish(c);
   b->flags |= B_VALID;
diff --git a/defs.h b/defs.h
index f54d829..6a4f1c2 100644
--- a/defs.h
+++ b/defs.h
@@ -106,7 +106,7 @@ void binit(void);
 struct buf;
 struct buf * getblk(uint dev, uint sector);
 struct buf *bread(uint, uint);
-void bwrite(uint, struct buf *, uint);
+void bwrite(struct buf *, uint);
 void brelse(struct buf *);
 
 // fs.c
diff --git a/fs.c b/fs.c
index b042bb2..e01b4fb 100644
--- a/fs.c
+++ b/fs.c
@@ -56,7 +56,7 @@ balloc(uint dev)
 
   cprintf ("balloc: allocate block %d\n", b);
   bp->data[bi/8] |= 0x1 << (bi % 8);
-  bwrite (dev, bp, BBLOCK(b, ninodes));  // mark it allocated on disk
+  bwrite (bp, BBLOCK(b, ninodes));  // mark it allocated on disk
   brelse(bp);
   return b;
 }
@@ -80,7 +80,7 @@ bfree(int dev, uint b)
   bi = b % BPB;
   m = ~(0x1 << (bi %8));
   bp->data[bi/8] &= m;
-  bwrite (dev, bp, BBLOCK(b, ninodes));  // mark it free on disk
+  bwrite (bp, BBLOCK(b, ninodes));  // mark it free on disk
   brelse(bp);
 }
 
@@ -147,7 +147,7 @@ iupdate (struct inode *ip)
   dip->nlink = ip->nlink;
   dip->size = ip->size;
   memmove(dip->addrs, ip->addrs, sizeof(ip->addrs));
-  bwrite (ip->dev, bp, IBLOCK(ip->inum));   // mark it allocated on the disk
+  bwrite (bp, IBLOCK(ip->inum));   // mark it allocated on the disk
   brelse(bp); 
 }
 
@@ -181,7 +181,7 @@ ialloc(uint dev, short type)
 
   cprintf ("ialloc: %d\n", inum);
   dip->type = type;
-  bwrite (dev, bp, IBLOCK(inum));   // mark it allocated on the disk
+  bwrite (bp, IBLOCK(inum));   // mark it allocated on the disk
   brelse(bp);
   ip = iget (dev, inum);
   return ip;
@@ -353,7 +353,7 @@ writei(struct inode *ip, char *addr, uint off, uint n)
       m = min(BSIZE - off % BSIZE, n-r);
       bp = bread(ip->dev, bmap(ip, off / BSIZE));
       memmove (bp->data + off % BSIZE, addr, m);
-      bwrite (ip->dev, bp, bmap(ip, off/BSIZE));
+      bwrite (bp, bmap(ip, off/BSIZE));
       brelse (bp);
       r += m;
       off += m;
@@ -484,13 +484,16 @@ mknod(char *cp, short type, short major, short minor)
 
  found:
   ep->inum = ip->inum;
-  for(i = 0; i < DIRSIZ && cp[i]; i++) ep->name[i] = cp[i];
-  bwrite (dp->dev, bp, bmap(dp, off/BSIZE));   // write directory block
+  for(i = 0; i < DIRSIZ && cp[i]; i++)
+    ep->name[i] = cp[i];
+  for( ; i < DIRSIZ; i++)
+    ep->name[i] = '\0';
+  bwrite (bp, bmap(dp, off/BSIZE));   // write directory block
   brelse(bp);
-  dp->size += sizeof(struct dirent);   // update directory inode
-  iupdate (dp);
-          iput(dp);
-          return ip;
+
+  iput(dp);
+
+  return ip;
 }
 
 int
@@ -531,7 +534,7 @@ unlink(char *cp)
 
  found:
   ep->inum = 0;
-  bwrite (dp->dev, bp, bmap(dp, off/BSIZE));   // write directory block
+  bwrite (bp, bmap(dp, off/BSIZE));   // write directory block
   brelse(bp);
   iupdate (dp);
   iput(dp);