problem in reading block filesystem

problem in reading block filesystem

[Rabeeh Khoury]

Hi All,

I'v downloaded the latest mtd sources from the CVS server, and attached 
a flash driver for Galileo Technology evaluation boards.

I have 16MByte of flash memory on board -

[~]$ cat /proc/mtd
dev:    size   erasesize  name
mtd0: 01000000 00040000 "Galileo Flash Memory"

Then I try checking the filesystem on the flash memory, which has not 
been initialized at all -

(/dev/mtd0 is a block file major 31 and minor 0 for activating the flash 
memory as a normal block device)

[~]$ e2fsck /dev/mtd0
e2fsck 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
Couldn't find ext2 superblock, trying backup blocks...
e2fsck: Attempt to read block from filesystem resulted in short read 
while trying to open /dev/mtd0
Could this be a zero-length partition?

and I get the following mtd debug info -

Jan  3 09:11:54 lion128 kernel: mtdblock_open
Jan  3 09:11:54 lion128 kernel: ok
Jan  3 09:11:54 lion128 kernel: mtdblock: read on "Galileo Flash Memory" 
at 0x0, size 0x1000
Jan  3 09:11:54 lion128 kernel: mtdblock_release
Jan  3 09:11:54 lion128 kernel: ok
Jan  3 09:11:54 lion128 kernel: mtdblock_open
Jan  3 09:11:54 lion128 kernel: ok
Jan  3 09:11:54 lion128 kernel: mtdblock: read on "Galileo Flash Memory" 
at 0x800000, size 0x1000
Jan  3 09:11:54 lion128 kernel: mtdblock_release
Jan  3 09:11:54 lion128 kernel: ok
Jan  3 09:11:54 lion128 kernel: mtdblock_open
Jan  3 09:11:54 lion128 kernel: ok
Jan  3 09:11:54 lion128 kernel: mtdblock_release
Jan  3 09:11:54 lion128 kernel: ok
Jan  3 09:11:54 lion128 kernel: mtdblock_open
Jan  3 09:11:54 lion128 kernel: ok
Jan  3 09:11:54 lion128 kernel: mtdblock_release
Jan  3 09:11:54 lion128 kernel: ok
Jan  3 09:11:54 lion128 kernel: mtdblock_open
Jan  3 09:11:54 lion128 kernel: ok
Jan  3 09:11:54 lion128 kernel: mtdblock_release
Jan  3 09:11:54 lion128 kernel: ok

Then I try creating a new filesystem on the flash -

[root@lion128 ~]$ mke2fs /dev/mtd0
mke2fs 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
4096 inodes, 16384 blocks
819 blocks (5.00%) reserved for the super user
First data block=1
2 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks:
   8193

Writing inode tables: 0/2Warning: could not write 8 blocks in inode 
table starting at 5: Attempt to write block from filesystem resulted in 
short write
Warning: could not write 8 blocks in inode table starting at 13: Attempt 
to write block from filesystem resulted in short write
Warning: could not write 8 blocks in inode table starting at 21: Attempt 
to write block from filesystem resulted in short write
Warning: could not write 8 blocks in inode table starting at 29: Attempt 
to write block from filesystem resulted in short write
Warning: could not write 8 blocks in inode table starting at 37: Attempt 
to write block from filesystem resulted in short write
Warning: could not write 8 blocks in inode table starting at 45: Attempt 
to write block from filesystem resulted in short write
Warning: could not write 8 blocks in inode table starting at 53: Attempt 
to write block from filesystem resulted in short write

...
...
Warning: could not write 8 blocks in inode table starting at 8445: 
Attempt to write block from filesystem resulted in short write
done
ext2fs_mkdir: Attempt to write block from filesystem resulted in short 
write while creating root dir


and I get the following mtd debug info -

Jan  3 09:12:05 lion128 kernel: mtdblock_open
Jan  3 09:12:05 lion128 kernel: ok
Jan  3 09:12:05 lion128 kernel: mtdblock_release
Jan  3 09:12:05 lion128 kernel: ok
Jan  3 09:12:05 lion128 kernel: mtdblock_open
Jan  3 09:12:05 lion128 kernel: ok
Jan  3 09:12:05 lion128 kernel: mtdblock_release
Jan  3 09:12:05 lion128 kernel: ok
Jan  3 09:12:23 lion128 kernel: mtdblock_open
Jan  3 09:12:23 lion128 kernel: ok
Jan  3 09:12:23 lion128 kernel: mtdblock_release
Jan  3 09:12:23 lion128 kernel: ok
Jan  3 09:12:23 lion128 kernel: mtdblock_open
Jan  3 09:12:23 lion128 kernel: ok
Jan  3 09:12:23 lion128 kernel: mtdblock_release
Jan  3 09:12:23 lion128 kernel: ok

p.s. debug level is 3 (noisy)


The mtd doesn't even call my write function or erase function at all !!!

Can you see what could be the problem ?

I have other questions -
Is there any new API documentation on the net ?
Is there any documentation on how to activate the other features of the 
MTD subsystem (FTL and others...)

Thanks a ton -
Rabeeh




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Re: problem in reading block filesystem

[Rabeeh Khoury]

fixed it.

Thank you

Rabeeh Khoury wrote:

> Hi All,
> 
> I'v downloaded the latest mtd sources from the CVS server, and 
> attached a flash driver for Galileo Technology evaluation boards.
> 
> I have 16MByte of flash memory on board -
> 
> [~]$ cat /proc/mtd
> dev:    size   erasesize  name
> mtd0: 01000000 00040000 "Galileo Flash Memory"
> 
> Then I try checking the filesystem on the flash memory, which has not 
> been initialized at all -
> 
> (/dev/mtd0 is a block file major 31 and minor 0 for activating the 
> flash memory as a normal block device)
> 
> [~]$ e2fsck /dev/mtd0
> e2fsck 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
> Couldn't find ext2 superblock, trying backup blocks...
> e2fsck: Attempt to read block from filesystem resulted in short read 
> while trying to open /dev/mtd0
> Could this be a zero-length partition?
> 
> and I get the following mtd debug info -
> 
> Jan  3 09:11:54 lion128 kernel: mtdblock_open
> Jan  3 09:11:54 lion128 kernel: ok
> Jan  3 09:11:54 lion128 kernel: mtdblock: read on "Galileo Flash 
> Memory" at 0x0, size 0x1000
> Jan  3 09:11:54 lion128 kernel: mtdblock_release
> Jan  3 09:11:54 lion128 kernel: ok
> Jan  3 09:11:54 lion128 kernel: mtdblock_open
> Jan  3 09:11:54 lion128 kernel: ok
> Jan  3 09:11:54 lion128 kernel: mtdblock: read on "Galileo Flash 
> Memory" at 0x800000, size 0x1000
> Jan  3 09:11:54 lion128 kernel: mtdblock_release
> Jan  3 09:11:54 lion128 kernel: ok
> Jan  3 09:11:54 lion128 kernel: mtdblock_open
> Jan  3 09:11:54 lion128 kernel: ok
> Jan  3 09:11:54 lion128 kernel: mtdblock_release
> Jan  3 09:11:54 lion128 kernel: ok
> Jan  3 09:11:54 lion128 kernel: mtdblock_open
> Jan  3 09:11:54 lion128 kernel: ok
> Jan  3 09:11:54 lion128 kernel: mtdblock_release
> Jan  3 09:11:54 lion128 kernel: ok
> Jan  3 09:11:54 lion128 kernel: mtdblock_open
> Jan  3 09:11:54 lion128 kernel: ok
> Jan  3 09:11:54 lion128 kernel: mtdblock_release
> Jan  3 09:11:54 lion128 kernel: ok
> 
> Then I try creating a new filesystem on the flash -
> 
> [root@lion128 ~]$ mke2fs /dev/mtd0
> mke2fs 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
> Filesystem label=
> OS type: Linux
> Block size=1024 (log=0)
> Fragment size=1024 (log=0)
> 4096 inodes, 16384 blocks
> 819 blocks (5.00%) reserved for the super user
> First data block=1
> 2 block groups
> 8192 blocks per group, 8192 fragments per group
> 2048 inodes per group
> Superblock backups stored on blocks:
>   8193
> 
> Writing inode tables: 0/2Warning: could not write 8 blocks in inode 
> table starting at 5: Attempt to write block from filesystem resulted 
> in short write
> Warning: could not write 8 blocks in inode table starting at 13: 
> Attempt to write block from filesystem resulted in short write
> Warning: could not write 8 blocks in inode table starting at 21: 
> Attempt to write block from filesystem resulted in short write
> Warning: could not write 8 blocks in inode table starting at 29: 
> Attempt to write block from filesystem resulted in short write
> Warning: could not write 8 blocks in inode table starting at 37: 
> Attempt to write block from filesystem resulted in short write
> Warning: could not write 8 blocks in inode table starting at 45: 
> Attempt to write block from filesystem resulted in short write
> Warning: could not write 8 blocks in inode table starting at 53: 
> Attempt to write block from filesystem resulted in short write
> 
> ....
> ....
> Warning: could not write 8 blocks in inode table starting at 8445: 
> Attempt to write block from filesystem resulted in short write
> done
> ext2fs_mkdir: Attempt to write block from filesystem resulted in short 
> write while creating root dir
> 
> 
> and I get the following mtd debug info -
> 
> Jan  3 09:12:05 lion128 kernel: mtdblock_open
> Jan  3 09:12:05 lion128 kernel: ok
> Jan  3 09:12:05 lion128 kernel: mtdblock_release
> Jan  3 09:12:05 lion128 kernel: ok
> Jan  3 09:12:05 lion128 kernel: mtdblock_open
> Jan  3 09:12:05 lion128 kernel: ok
> Jan  3 09:12:05 lion128 kernel: mtdblock_release
> Jan  3 09:12:05 lion128 kernel: ok
> Jan  3 09:12:23 lion128 kernel: mtdblock_open
> Jan  3 09:12:23 lion128 kernel: ok
> Jan  3 09:12:23 lion128 kernel: mtdblock_release
> Jan  3 09:12:23 lion128 kernel: ok
> Jan  3 09:12:23 lion128 kernel: mtdblock_open
> Jan  3 09:12:23 lion128 kernel: ok
> Jan  3 09:12:23 lion128 kernel: mtdblock_release
> Jan  3 09:12:23 lion128 kernel: ok
> 
> p.s. debug level is 3 (noisy)
> 
> 
> The mtd doesn't even call my write function or erase function at all !!!
> 
> Can you see what could be the problem ?
> 
> I have other questions -
> Is there any new API documentation on the net ?
> Is there any documentation on how to activate the other features of 
> the MTD subsystem (FTL and others...)
> 
> Thanks a ton -
> Rabeeh
> 
> 
> 
> 
> To unsubscribe, send "unsubscribe mtd" to majordomo@infradead.org
> 
> 
> 



To unsubscribe, send "unsubscribe mtd" to majordomo@infradead.org