MS-DOS File System questions - partitions, mounting, files - RESOLVED

[Robert S. Grimes]

Oops!  Sorry, bad form and all, but it was indeed my inexperience - 
sorry to waste the bandwidth on this.  In the hopes of helping someone 
else, I will point out my errors:

1. First, this function is sufficient for mounting the MSDOS filesystem 
on my partition on the SD Card.
>     CHECK_RVSC( rv, "Create mount point");
>     rv = rtems_fsmount(fsTable, sizeof(fsTable) / sizeof(fsTable[0]), NULL);
>     CHECK_RVSC( rv, "Mount file systems");
>
>   

This is, as far as I can tell, an alternate way of doing it:
>     rtems_filesystem_mount_table_entry_t* mtEntry;
>     if (mount(&mtEntry, &msdos_ops, RTEMS_FILESYSTEM_READ_WRITE,
>     "/dev/sdcarda1", "/mnt/dirone") < 0) {
>       printf("mount: mount failed: %s\n", strerror (errno));
>     }
>   
One does not need both!

2. Of course, because the rtems_fsmount() call was successful, and the 
mount() failure is essentially a no-op, the print directory calls, and 
the open()/read()/close() sequence works fine.

3. The mkdir()/chdir() combinations only partially worked because I 
didn't unmount() before ending the session, and hence, not all changes 
made it to the SD card; I think this explains why the directory 
sometimes showed up or not, or was corrupted or no, in Windows.

4. The open() call to write to a (non-existent) file fails as you might 
expect - I forgot the O_CREAT flag.

Now, all is working fine!
-Bob

>     // This doesn't work, but maybe that is because the mount() fails?
>     If so, would this be correct
>     // if mount() had succeeded?
>     int writeme = open("newfile.txt", O_WRONLY);
>     printf("\nCreating newfile.txt, returned %d\n", writeme);
>     if (writeme > 0) {
>       sprintf(linebuf, "Hello, world!\n");
>       write(writeme, linebuf, strlen(linebuf)+1);
>       close(writeme);
>     }
>
>     // Same question as previous open()
>     writeme = open("/mnt/newfile.txt", O_WRONLY);
>     printf("\nCreating /mnt/newfile.txt, returned %d\n", writeme);
>     if (writeme > 0) {
>       sprintf(linebuf, "Hello, world!\n");
>       write(writeme, linebuf, strlen(linebuf)+1);
>       close(writeme);
>     }
>
>
> Here is the output from the above code:
>
>     Print /dev directory
>     <console>
>     <spi0.sdcarda>
>     <sdcarda>
>     <sdcarda1>
>     Returned 0
>
>     Print /mnt directory
>     <README.TXT>
>     <DIRONE>
>             <README1.TXT>
>     <DIRTWO>
>             <README2.TXT>
>     <TESTDIR3>
>     Returned 0
>
>     mount: mount failed: Not supported
>     Readme contains: [This is a simple text file.]
>
>     Make a directory and move to it
>     Returned: -1
>     printDir returned 0
>     Change directory returned 0
>
>     Creating newfile.txt, returned -1
>
>     Creating /mnt/newfile.txt, returned -1
>
> Thanks!
> -Bob
>
>
>
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