Hi, all
The attached patch implements saving of yaffs checkpoint in case fs is
remounted read-only. This allows the usage of checkpoint mechanizm even if,
for some reason, the system can not cleanly unmount yaffs filesystem but can
remount it read-only.
It also fixes a problem with an implementation of yaffs_put_super that
"puts" mtd device before saving yaffs checkpoint.
M.
--- old/yaffs_fs.c 2007-02-13 17:09:06.000000000 -0800
+++ new/yaffs_fs.c 2007-03-09 19:26:49.000000000 -0800
@@ -158,6 +158,8 @@
static int yaffs_write_super(struct super_block *sb);
#endif
+static int yaffs_remount_fs(struct super_block *, int *, char *);
+
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
@@ -250,6 +252,7 @@
.read_inode = yaffs_read_inode,
.put_inode = yaffs_put_inode,
.put_super = yaffs_put_super,
+ .remount_fs = yaffs_remount_fs,
.delete_inode = yaffs_delete_inode,
.clear_inode = yaffs_clear_inode,
.sync_fs = yaffs_sync_fs,
@@ -1414,6 +1417,35 @@
static LIST_HEAD(yaffs_dev_list);
+static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+ yaffs_Device *dev = yaffs_SuperToDevice(sb);
+
+ if( *flags & MS_RDONLY ) {
+ struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
+
+ T(YAFFS_TRACE_OS,
+ (KERN_DEBUG "yaffs_remount_fs: %s: RO\n", dev->name ));
+
+ yaffs_GrossLock(dev);
+
+ yaffs_FlushEntireDeviceCache(dev);
+
+ yaffs_CheckpointSave(dev);
+
+ if (mtd->sync)
+ mtd->sync(mtd);
+
+ yaffs_GrossUnlock(dev);
+ }
+ else {
+ T(YAFFS_TRACE_OS,
+ (KERN_DEBUG "yaffs_remount_fs: %s: RW\n", dev->name ));
+ }
+
+ return 0;
+}
+
static void yaffs_put_super(struct super_block *sb)
{
yaffs_Device *dev = yaffs_SuperToDevice(sb);
@@ -1423,12 +1455,13 @@
yaffs_GrossLock(dev);
yaffs_FlushEntireDeviceCache(dev);
-
+
+ yaffs_CheckpointSave(dev);
+
if (dev->putSuperFunc) {
dev->putSuperFunc(sb);
}
-
- yaffs_CheckpointSave(dev);
+
yaffs_Deinitialise(dev);
yaffs_GrossUnlock(dev);
(text/plain)
