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Moving files between flash and ramdisk #17

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sbourdeauducq opened this issue May 25, 2011 · 6 comments

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commented May 25, 2011

Moving files between flash and ramdisk does not work. It copies empty files instead.

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commented May 26, 2011

[/ssd] # ls -l sysconfig.bin
-rw-rw-rw- 1 root root 612 Jan 1 1970 sysconfig.bin

[/ssd] # cp sysconfig.bin /ramdisk/
[/ssd] # ls -l /ramdisk/
total 0
-rw-r--r-- 1 root root 612 Jan 1 00:19 sysconfig.bin

[/ssd] # cp /ramdisk/sysconfig.bin ./test
[/ssd] # ls -l test
-rw-r--r-- 1 root root 612 Jan 2 1970 test

[/ssd] # mv test /ramdisk
[/ssd] # ls -l /ramdisk
total 0
-rw-r--r-- 1 root root 612 Jan 1 00:19 sysconfig.bin
-rw-r--r-- 1 root root 612 Jan 1 00:19 test

When move file from /ramdisk to /ssd there is error:
[/ssd] # mv /ramdisk/test ./test-2
No such file or directory
[/ssd] # ls -l /ramdisk
total 0
-rw-r--r-- 1 root root 612 Jan 1 00:19 sysconfig.bin
-rw-r--r-- 1 root root 612 Jan 1 00:19 test
[/ssd] # ls -l ./test-2
-rw-r--r-- 1 root root 0 Jan 2 1970 ./test-2

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commented May 26, 2011

just catch the problem, the ramdisk file st_blksize is 0, will try to give 'blen' a default value,
how about 512*1024?

more info, rtems-milkymist.git/cpukit/libmisc/shell/main_mv.c: line 346:

         if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {                                                               
                warn("blksize: %d", sbp->st_blksize);                                                                        
                blen = 0;                                                                                                    
                (void)close(from_fd);                                                                                        
                (void)close(to_fd);                                                                                          
                return (1);                                                                                                  
        } 
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commented May 26, 2011

IMO this should be fixed in the YAFFS2 port, not worked around in the mv command.

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commented May 26, 2011

What's the value of obj->my_dev->data_bytes_per_chunk?
https://github.com/milkymist/rtems-yaffs2/blob/master/direct/rtems/rtems.c#L735

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