Hi,
I used yaffs2 direct interface 2 years ago without problems (archive of 
2010/06/11).
I updated to latest git version (linux style renaming and minor 
modifications).
But I meet a very strange issue:
When I don't yaffs_sync() after updating a file, then after rebooting, 
the partition is mounted without checkpoint.
In this case, the file system structure is perfectly OK (names, sizes), 
but reading the files gives null data.

I simulated on a PC with a file, and the result is the same.
What happens ?

Here a simple test, the "/boot" partition uses blocks 0 to 63 with 
packed tags 2 + ECC in the spare area.
Run it 2 times with normal mounting for append test.
Run it with read-only mounting for read test -> OK.
Run it with read-only, no checkpoint read -> null data.

constchar*dev="/boot";


intmain(void)

{

	char*  logfile  =  0;

	struct  yaffs_stat  st;


	//  Initialise  File  System

	yaffs_start_up();

	//yaffs_mount(dev);			// Normal

	yaffs_mount_common(dev,  1,  0);		//  Read-only, read checkpoint

	//yaffs_mount_common(dev,  0,  1);	//  Read-write,  don't  read  checkpoint

	//yaffs_mount_common(dev,  1,  1);	//  Read-only,  don't  read  checkpoint


	//  Logfile  read  test

	if  (0)

	{

		int  fd0  =  yaffs_open("/boot/log0.txt",  O_RDONLY,  S_IREAD|S_IWRITE);

		if  (fd0  >=  0)

		{

			yaffs_fstat(fd0,  &st);

			logfile  =  malloc(st.st_size+1);

			yaffs_read(fd0,  logfile,  st.st_size);

			logfile[st.st_size]  =  '\0';

			yaffs_close(fd0);

		}

	}

	//  Logfile  append  test

	if  (1)

	{

		int  fd0  =  yaffs_open("/boot/log0.txt",  O_CREAT|O_RDWR|O_APPEND,  S_IREAD|S_IWRITE);

		if  (fd0  >=  0)

		{

			const  char*  buf  =  "2012/05/31  13:41  Test\n";

			yaffs_write(fd0,  buf,  strlen(buf));

			yaffs_close(fd0);

		}

	}

	if  (1)

	{

		yaffs_sync(dev);

		yaffs_unmount(dev);

	}

	return  0;

}



-- 
Stephane Lesage