ERROR: failed to get size of '/dev/block/mmcblk1'

[kirichen]

Hi there,

I use exfat v101 on linux and android for uSD card. No problem to mount card on linux and I can see all files on it before and after android. The first time on   android I mount card and application uses card(read movi....)  On  android I cann't mount card after I unmount it . 

ERROR: failed to get size of '/dev/block/mmcblk1'

The same error for exfatfsck on   android  and no problem on linux only warning

exfatfsck /dev/sdb

exfatfsck 1.0.1

WARN: volume was not unmounted cleanly.

Checking file system on /dev/sdb.

File system version           1.0

Sector size                 512 bytes

Cluster size                 32 KB

Volume size                7580 MB

Used space                  118 MB

Available space            7462 MB

Totally 9 directories and 51 files.

File system checking finished. No errors found.

[Andrew Nayenko]

Hi,

It's a known issue. Unlike all modern systems, Android does not provide
native LFS (Large File Support) API, which is used by fuse-exfat. I plan
switching to transitional (legacy) LFS API in the future. This will fix
this problem on Android.

--
Andrew Nayenko <res...@gmail.com>

[kirichen]

Спасибо за разработку


пятница, 26 апреля 2013 г., 0:17:17 UTC+4 пользователь Andrew Nayenko написал:

[pavel.b...@gmail.com]

I have same error while mkexfatfs /dev/mmcblk0p1
# mkexfatfs /dev/mmcblk0p1
mkexfatfs 1.0.1
ERROR: failed to get size of `/dev/mmcblk0p1'.
#

[Andrew Nayenko]

Is this Android?

>> Andrew Nayenko <res...@gmail.com <javascript:>>
>>
>

--
Andrew Nayenko <res...@gmail.com>

[pavel.b...@gmail.com]

Not Android, but arm.

[Andrew Nayenko]

So, what operating system and storage device is this?

[pavel.b...@gmail.com]

Montavista 5.0 and SD card 16Gb

[Andrew Nayenko]

> Montavista 5.0 and SD card 16Gb

Does it have Large File Support? I.e. is there any way to make its
libc define off_t as a 64-bit type? Internets say MontaVista can have
various libc implementations. Which one is used in your case?

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--
Andrew Nayenko <res...@gmail.com>

[pavel.b...@gmail.com]

I Dont know how it check.
kernel 2.6.18 and libc  2.5.90.

[Andrew Nayenko]

> I Dont know how it check.
> kernel 2.6.18 and libc 2.5.90.

OK, looks like it's glibc. You need to define _FILE_OFFSET_BITS=64 to
make the code work. Did you use scons to build exfat-utils?

[pavel.b...@gmail.com]

Your scons config doesn't support cross compile, so i use compiled binaries from android, its already compiled with _FILE_OFFSET_BITS=64 flag.

[Andrew Nayenko]

> Your scons config doesn't support cross compile, so i use compiled binaries
> from android, its already compiled with _FILE_OFFSET_BITS=64 flag.

Bionic and glibc are not binary-compatible. Do you use libhybris?
Anyway, bionic does not have native LFS and does not care about
_FILE_OFFSET_BITS. Try rebuilding exfat-utils against your glibc.

[goldni...@gmail.com]

Dear Andrew

 

Could you explain how to compile exfat-utils with glibc more specifically?

I am porting exfat-utils on Android and I have same problem with FILE_OFFSET_BITS=64 thing.

It seems that Android doesn't support Large File Support, How can I make exfat-utils work on Android then?

I made a Android.mk file to build libs and fsckexfat.

If you tell me what kind of api I shoud change, I wil try.

 

Thank you for your support in advance. 

 

 

 

2014년 1월 29일 수요일 오전 3시 38분 54초 UTC+9, Andrew Nayenko 님의 말: