Prevent resizes bigger than 2GBytes

[yaffs2.git] / yaffs_fs.c

diff --git a/yaffs_fs.c b/yaffs_fs.c
index a62724fe16e5d8c81b19917dfce6c6ce2b1491d3..8034a066edd39f72414692656d60355cd360bdf6 100644 (file)
--- a/yaffs_fs.c
+++ b/yaffs_fs.c
@@ -32,7 +32,7 @@
  */
 
 const char *yaffs_fs_c_version =
-    "$Id: yaffs_fs.c,v 1.90 2009-12-23 03:14:17 charles Exp $";
+    "$Id: yaffs_fs.c,v 1.93 2010-02-10 03:54:08 charles Exp $";
 extern const char *yaffs_guts_c_version;
 
 #include <linux/version.h>
@@ -114,6 +114,7 @@ static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
 #include <linux/uaccess.h>
 
 #include "yportenv.h"
+#include "yaffs_trace.h"
 #include "yaffs_guts.h"
 
 #include <linux/mtd/mtd.h>
@@ -323,6 +324,17 @@ static const struct file_operations yaffs_file_operations = {
 };
 #endif
 
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25))
+static void zero_user_segment(struct page *page, unsigned start, unsigned end)
+{
+       void * kaddr = kmap_atomic(page, KM_USER0);
+       memset(kaddr + start, 0, end - start);
+       kunmap_atomic(kaddr, KM_USER0);
+       flush_dcache_page(page);
+}
+#endif
+
+
 static const struct inode_operations yaffs_file_inode_operations = {
        .setattr = yaffs_setattr,
 };
@@ -1585,7 +1597,7 @@ static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 
        dev = obj->myDev;
 
-       T(YAFFS_TRACE_OS, ("yaffs_sync_object\n"));
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, ("yaffs_sync_object\n"));
        yaffs_GrossLock(dev);
        yaffs_FlushFile(obj, 1, datasync);
        yaffs_GrossUnlock(dev);
@@ -1650,14 +1662,20 @@ static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
 {
        struct inode *inode = dentry->d_inode;
-       int error;
+       int error = 0;
        yaffs_Device *dev;
 
        T(YAFFS_TRACE_OS,
                ("yaffs_setattr of object %d\n",
                yaffs_InodeToObject(inode)->objectId));
 
-       error = inode_change_ok(inode, attr);
+       /* Fail if a requested resize >= 2GB */         
+       if (attr->ia_valid & ATTR_SIZE &&
+               (attr->ia_size >> 31))
+               error = -EINVAL;
+
+       if (error == 0)
+               error = inode_change_ok(inode, attr);
        if (error == 0) {
                int result;
                if (!error){
@@ -1680,8 +1698,9 @@ static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
                yaffs_GrossUnlock(dev);
 
        }
+
        T(YAFFS_TRACE_OS,
-               ("yaffs_setattr done\n"));
+               ("yaffs_setattr done returning %d\n",error));
 
        return error;
 }
@@ -1776,7 +1795,7 @@ static int yaffs_do_sync_fs(struct super_block *sb)
 {
 
        yaffs_Device *dev = yaffs_SuperToDevice(sb);
-       T(YAFFS_TRACE_OS, ("yaffs_do_sync_fs\n"));
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, ("yaffs_do_sync_fs\n"));
 
        if (sb->s_dirt) {
                yaffs_GrossLock(dev);
@@ -1802,7 +1821,7 @@ static int yaffs_write_super(struct super_block *sb)
 #endif
 {
 
-       T(YAFFS_TRACE_OS, ("yaffs_write_super\n"));
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, ("yaffs_write_super\n"));
        if (yaffs_auto_checkpoint >= 2)
                yaffs_do_sync_fs(sb);
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
@@ -1817,7 +1836,7 @@ static int yaffs_sync_fs(struct super_block *sb, int wait)
 static int yaffs_sync_fs(struct super_block *sb)
 #endif
 {
-       T(YAFFS_TRACE_OS, ("yaffs_sync_fs\n"));
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, ("yaffs_sync_fs\n"));
 
        if (yaffs_auto_checkpoint >= 1)
                yaffs_do_sync_fs(sb);
@@ -2593,6 +2612,7 @@ static struct {
        {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
        {"scan", YAFFS_TRACE_SCAN},
        {"tracing", YAFFS_TRACE_TRACING},
+       {"sync", YAFFS_TRACE_SYNC},
 
        {"verify", YAFFS_TRACE_VERIFY},
        {"verify_nand", YAFFS_TRACE_VERIFY_NAND},