1 files changed, 65 insertions, 0 deletions

diff --git a/src/fs/truncate.c b/src/fs/truncate.c
new file mode 100644
index 0000000..cb22d5f
--- /dev/null
+++ b/src/fs/truncate.c
@@ -0,0 +1,65 @@
+/*
+ *  linux/fs/truncate.c
+ *
+ *  (C) 1991  Linus Torvalds
+ */
+
+#include <linux/sched.h>
+
+#include <sys/stat.h>
+
+static void free_ind(int dev,int block)
+{
+        struct buffer_head * bh;
+        unsigned short * p;
+        int i;
+
+        if (!block)
+                return;
+        if ((bh=bread(dev,block))) {
+                p = (unsigned short *) bh->b_data;
+                for (i=0;i<512;i++,p++)
+                        if (*p)
+                                free_block(dev,*p);
+                brelse(bh);
+        }
+        free_block(dev,block);
+}
+
+static void free_dind(int dev,int block)
+{
+        struct buffer_head * bh;
+        unsigned short * p;
+        int i;
+
+        if (!block)
+                return;
+        if ((bh=bread(dev,block))) {
+                p = (unsigned short *) bh->b_data;
+                for (i=0;i<512;i++,p++)
+                        if (*p)
+                                free_ind(dev,*p);
+                brelse(bh);
+        }
+        free_block(dev,block);
+}
+
+void truncate(struct m_inode * inode)
+{
+        int i;
+
+        if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
+                return;
+        for (i=0;i<7;i++)
+                if (inode->i_zone[i]) {
+                        free_block(inode->i_dev,inode->i_zone[i]);
+                        inode->i_zone[i]=0;
+                }
+        free_ind(inode->i_dev,inode->i_zone[7]);
+        free_dind(inode->i_dev,inode->i_zone[8]);
+        inode->i_zone[7] = inode->i_zone[8] = 0;
+        inode->i_size = 0;
+        inode->i_dirt = 1;
+        inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+}
+