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
(text/plain)