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eMMCFS -- Samsung eMMC chip oriented File System

http://forum.samygo.tv/viewtopic.php?t=5993

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eMMCFS -- Samsung eMMC chip oriented File System

Posted: Wed May 29, 2013 7:49 pm
by juusso
Maybe anyone knows how to mount/open emmcfs filesystem?
sources attached (maybe anyone can port it for desktop?) - done.

Really "helpful" README

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============================================================
eMMCFS -- Samsung eMMC chip oriented File System, Version 1.
============================================================

Contents:
- Overview
- eMMCFS design and specification
- eMMCFS basic features
- eMMCFS driver architecture
- Implementation details
- How to install
- Usage
- Mount options
- Proc file system
- Utilities
- Examples
- Important notes
- Bugs, restrictions, caveats
- Authors

========
OVERVIEW
========

<TODO: describe>

===============================
eMMCFS DESIGN AND SPECIFICATION
===============================

<TODO: describe>

=====================
eMMCFS BASIC FEATURES
=====================

<TODO: describe>

===================
eMMCFS DRIVER ARCHITECTURE
===================

<TODO: describe>

======================
IMPLEMENTATION DETAILS
======================

<TODO: describe>

==============
HOW TO INSTALL
==============

<TODO: describe>

=====
USAGE
=====

<TODO: describe>

=============
MOUNT OPTIONS
=============

<TODO: describe>

===============
PROC FILESYSTEM
===============

<TODO: describe>

=========
UTILITIES
=========

<TODO: describe>

========
EXAMPLES
========

<TODO: describe>

===============
IMPORTANT NOTES
===============

<TODO: describe>

===========================
BUGS, RESTRICTIONS, CAVEATS
===========================

<TODO: describe>

=======
AUTHORS
=======


Development team:
:)

Re: eMMCFS -- Samsung eMMC chip oriented File System

Posted: Mon Jun 10, 2013 4:18 pm
by nobody
LOL!

Re: eMMCFS -- Samsung eMMC chip oriented File System

Posted: Wed Jun 12, 2013 3:48 pm
by arkoPL
Hello,
do you have emmcfs_fs.h file?

Re: eMMCFS -- Samsung eMMC chip oriented File System

Posted: Wed Jun 12, 2013 3:54 pm
by juusso
this file exists in f series kernel sources. (include/linux).

btw, module was compiled for e series using T-ECPDEUC kernel sources, but compilation for desktop pc ends with errors...
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 make
make -C /usr/src/linux-headers-`uname -r` SUBDIRS=/opt/compile/compile/emmcfs_mod modules;
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-47-generic'
  CC [M]  /opt/compile/compile/emmcfs_mod/btree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/bnode.o
  CC [M]  /opt/compile/compile/emmcfs_mod/cattree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/file.o
  CC [M]  /opt/compile/compile/emmcfs_mod/inode.o
/opt/compile/compile/emmcfs_mod/inode.c: In function ?emmcfs_write_begin?:
/opt/compile/compile/emmcfs_mod/inode.c:1431: error: implicit declaration of function ?BUILD_BUG?
/opt/compile/compile/emmcfs_mod/inode.c: In function ?emmcfs_file_fsync?:
/opt/compile/compile/emmcfs_mod/inode.c:2292: error: implicit declaration of function ?generic_file_fsync?
/opt/compile/compile/emmcfs_mod/inode.c: At top level:
/opt/compile/compile/emmcfs_mod/inode.c:2319: warning: initialization from incompatible pointer type
/opt/compile/compile/emmcfs_mod/inode.c: In function ?emmcfs_new_inode?:
/opt/compile/compile/emmcfs_mod/inode.c:2375: error: implicit declaration of function ?inode_init_owner?
make[2]: *** [/opt/compile/compile/emmcfs_mod/inode.o] Error 1
make[1]: *** [_module_/opt/compile/compile/emmcfs_mod] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-47-generic'
make: *** [default] Error 2
What i did...
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1. patched out BUILD_BUG function emmcfs_write_begin in inode.c (from row 1416) if kernel does not match (used values from kernel 2.6.35). Like this:

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#else
        //BUILD_BUG();
        *pagep = NULL;
        rc = block_write_begin(file, mapping, pos, len, flags, pagep,
                NULL, emmcfs_get_block);
2. Same did for emmc_setattr function (from row 1653) (used values from kernel 2.6.35 and from kernel 3.0.20 as well, almost same kind errors)

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#else
        //BUILD_BUG();
        generic_setattr(inode, iattr);
Now no BUILD_BUG error, but still no success.
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make
make -C /usr/src/linux-headers-`uname -r` SUBDIRS=/opt/compile/compile/emmcfs_mod modules;
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-47-generic'
  CC [M]  /opt/compile/compile/emmcfs_mod/btree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/bnode.o
  CC [M]  /opt/compile/compile/emmcfs_mod/cattree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/file.o
  CC [M]  /opt/compile/compile/emmcfs_mod/inode.o
/opt/compile/compile/emmcfs_mod/inode.c: In function ?emmcfs_setattr?:
/opt/compile/compile/emmcfs_mod/inode.c:1679: error: implicit declaration of function ?generic_setattr?
/opt/compile/compile/emmcfs_mod/inode.c: In function ?emmcfs_file_fsync?:
/opt/compile/compile/emmcfs_mod/inode.c:2297: error: implicit declaration of function ?generic_file_fsync?
/opt/compile/compile/emmcfs_mod/inode.c: At top level:
/opt/compile/compile/emmcfs_mod/inode.c:2324: warning: initialization from incompatible pointer type
/opt/compile/compile/emmcfs_mod/inode.c: In function ?emmcfs_new_inode?:
/opt/compile/compile/emmcfs_mod/inode.c:2380: error: implicit declaration of function ?inode_init_owner?
make[2]: *** [/opt/compile/compile/emmcfs_mod/inode.o] Error 1
make[1]: *** [_module_/opt/compile/compile/emmcfs_mod] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-47-generic'
make: *** [default] Error 2
3. Now patched out all #if statements for kernel version in fs.h, no help either...

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#if LINUX_VERSION_CODE == KERNEL_VERSION(2, 6, 35) -> #if LINUX_VERSION_CODE == KERNEL_VERSION(2, 6, 32)
4. neither generic_setattr nor generic_file_fsync are not defined in include/linux/fs.h, so edited my desktops include/linux/fs.h and added obove the #CONFIG_MIGRATION:

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extern int generic_file_fsync(struct file *, int);
extern void generic_setattr(struct inode *inode, const struct iattr *attr);
Still errors, but few errors already less:

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make
make -C /usr/src/linux-headers-`uname -r` SUBDIRS=/opt/compile/compile/emmcfs_mod modules;
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-47-generic'
  CC [M]  /opt/compile/compile/emmcfs_mod/btree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/bnode.o
  CC [M]  /opt/compile/compile/emmcfs_mod/cattree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/file.o
  CC [M]  /opt/compile/compile/emmcfs_mod/inode.o
/opt/compile/compile/emmcfs_mod/inode.c:2328: warning: initialization from incompatible pointer type
/opt/compile/compile/emmcfs_mod/inode.c: In function ?emmcfs_new_inode?:
/opt/compile/compile/emmcfs_mod/inode.c:2384: error: implicit declaration of function ?inode_init_owner?
make[2]: *** [/opt/compile/compile/emmcfs_mod/inode.o] Error 1
make[1]: *** [_module_/opt/compile/compile/emmcfs_mod] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-47-generic'
make: *** [default] Error 2
5. Okey, next patch:

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extern void inode_init_owner(struct inode *inode, const struct inode *dir,
                        mode_t mode);
and next error:

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make
make -C /usr/src/linux-headers-`uname -r` SUBDIRS=/opt/compile/compile/emmcfs_mod modules;
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-47-generic'
  CC [M]  /opt/compile/compile/emmcfs_mod/btree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/bnode.o
  CC [M]  /opt/compile/compile/emmcfs_mod/cattree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/file.o
  CC [M]  /opt/compile/compile/emmcfs_mod/inode.o
/opt/compile/compile/emmcfs_mod/inode.c:2328: warning: initialization from incompatible pointer type
  CC [M]  /opt/compile/compile/emmcfs_mod/options.o
  CC [M]  /opt/compile/compile/emmcfs_mod/super.o
/opt/compile/compile/emmcfs_mod/super.c:29:29: error: linux/emmcfs_fs.h: No such file or directory
/opt/compile/compile/emmcfs_mod/super.c:499: error: implicit declaration of function ?BUILD_EMMCFS_BUG?
/opt/compile/compile/emmcfs_mod/super.c:499: error: initializer element is not constant
/opt/compile/compile/emmcfs_mod/super.c:499: error: (near initialization for ?emmcfs_sops.remount_fs?)
/opt/compile/compile/emmcfs_mod/super.c:499: error: expected ?}? before ?;? token
/opt/compile/compile/emmcfs_mod/super.c:1593: error: initializer element is not constant
/opt/compile/compile/emmcfs_mod/super.c:1593: error: (near initialization for ?emmcfs_fs_type.fs_flags?)
/opt/compile/compile/emmcfs_mod/super.c:1593: error: expected ?}? before ?;? token
make[2]: *** [/opt/compile/compile/emmcfs_mod/super.o] Error 1
make[1]: *** [_module_/opt/compile/compile/emmcfs_mod] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-47-generic'
make: *** [default] Error 2
6. corrected includes in super.c to use included emmcfs_fs.h file instead of one from kernel tree. Now new errors:

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make
make -C /usr/src/linux-headers-`uname -r` SUBDIRS=/opt/compile/compile/emmcfs_mod modules;
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-47-generic'
  CC [M]  /opt/compile/compile/emmcfs_mod/btree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/bnode.o
  CC [M]  /opt/compile/compile/emmcfs_mod/cattree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/file.o
  CC [M]  /opt/compile/compile/emmcfs_mod/inode.o
/opt/compile/compile/emmcfs_mod/inode.c:2328: warning: initialization from incompatible pointer type
  CC [M]  /opt/compile/compile/emmcfs_mod/options.o
  CC [M]  /opt/compile/compile/emmcfs_mod/super.o
/opt/compile/compile/emmcfs_mod/super.c:499: error: implicit declaration of function ?BUILD_EMMCFS_BUG?
/opt/compile/compile/emmcfs_mod/super.c:499: error: initializer element is not constant
/opt/compile/compile/emmcfs_mod/super.c:499: error: (near initialization for ?emmcfs_sops.remount_fs?)
/opt/compile/compile/emmcfs_mod/super.c:499: error: expected ?}? before ?;? token
/opt/compile/compile/emmcfs_mod/super.c:1593: error: initializer element is not constant
/opt/compile/compile/emmcfs_mod/super.c:1593: error: (near initialization for ?emmcfs_fs_type.fs_flags?)
/opt/compile/compile/emmcfs_mod/super.c:1593: error: expected ?}? before ?;? token
make[2]: *** [/opt/compile/compile/emmcfs_mod/super.o] Error 1
make[1]: *** [_module_/opt/compile/compile/emmcfs_mod] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-47-generic'
make: *** [default] Error 2
7. Removing all #if statements for kernel version in file super.c. Ending with new issues:

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 make
make -C /usr/src/linux-headers-`uname -r` SUBDIRS=/opt/compile/compile/emmcfs_mod modules;
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-47-generic'
  CC [M]  /opt/compile/compile/emmcfs_mod/btree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/bnode.o
  CC [M]  /opt/compile/compile/emmcfs_mod/cattree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/file.o
  CC [M]  /opt/compile/compile/emmcfs_mod/inode.o
/opt/compile/compile/emmcfs_mod/inode.c:2328: warning: initialization from incompatible pointer type
  CC [M]  /opt/compile/compile/emmcfs_mod/options.o
  CC [M]  /opt/compile/compile/emmcfs_mod/super.o
  CC [M]  /opt/compile/compile/emmcfs_mod/fsm.o
  CC [M]  /opt/compile/compile/emmcfs_mod/fsm_btree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/extents.o
/opt/compile/compile/emmcfs_mod/extents.c:321: error: expected identifier or ?(? before ?if?
/opt/compile/compile/emmcfs_mod/extents.c:323: error: expected identifier or ?(? before ?return?
/opt/compile/compile/emmcfs_mod/extents.c:324: error: expected identifier or ?(? before ?}? token
make[2]: *** [/opt/compile/compile/emmcfs_mod/extents.o] Error 1
make[1]: *** [_module_/opt/compile/compile/emmcfs_mod] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-47-generic'
make: *** [default] Error 2
8. Removing all #if statements for kernel version in file data.c. Still failed...

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 make
make -C /usr/src/linux-headers-`uname -r` SUBDIRS=/opt/compile/compile/emmcfs_mod modules;
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-47-generic'
  CC [M]  /opt/compile/compile/emmcfs_mod/data.o
/opt/compile/compile/emmcfs_mod/data.c: In function ?emmcfs_write_snapshot_pages?:
/opt/compile/compile/emmcfs_mod/data.c:240: error: implicit declaration of function ?IS_ERR_OR_NULL?
make[2]: *** [/opt/compile/compile/emmcfs_mod/data.o] Error 1
make[1]: *** [_module_/opt/compile/compile/emmcfs_mod] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-47-generic'
make: *** [default] Error 2
9. added IS_ERR_OR_NULL to include/linux/err.h

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static inline long __must_check IS_ERR_OR_NULL(const void *ptr)
{
        return !ptr || IS_ERR_VALUE((unsigned long)ptr);
}
...and finaly! :)
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make
make -C /usr/src/linux-headers-`uname -r` SUBDIRS=/opt/compile/compile/emmcfs_mod modules;
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-47-generic'
  CC [M]  /opt/compile/compile/emmcfs_mod/btree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/bnode.o
  CC [M]  /opt/compile/compile/emmcfs_mod/cattree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/file.o
  CC [M]  /opt/compile/compile/emmcfs_mod/inode.o
/opt/compile/compile/emmcfs_mod/inode.c:2328: warning: initialization from incompatible pointer type
  CC [M]  /opt/compile/compile/emmcfs_mod/options.o
  CC [M]  /opt/compile/compile/emmcfs_mod/super.o
  CC [M]  /opt/compile/compile/emmcfs_mod/fsm.o
  CC [M]  /opt/compile/compile/emmcfs_mod/fsm_btree.o
  CC [M]  /opt/compile/compile/emmcfs_mod/extents.o
  CC [M]  /opt/compile/compile/emmcfs_mod/snapshot.o
  CC [M]  /opt/compile/compile/emmcfs_mod/orphan.o
  CC [M]  /opt/compile/compile/emmcfs_mod/data.o
  CC [M]  /opt/compile/compile/emmcfs_mod/procfs.o
  LD [M]  /opt/compile/compile/emmcfs_mod/emmcfs.o
  Building modules, stage 2.
  MODPOST 1 modules
WARNING: "generic_setattr" [/opt/compile/compile/emmcfs_mod/emmcfs.ko] undefined!
WARNING: "generic_file_fsync" [/opt/compile/compile/emmcfs_mod/emmcfs.ko] undefined!
WARNING: "inode_init_owner" [/opt/compile/compile/emmcfs_mod/emmcfs.ko] undefined!
  CC      /opt/compile/compile/emmcfs_mod/emmcfs.mod.o
  LD [M]  /opt/compile/compile/emmcfs_mod/emmcfs.ko
make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-47-generic'
but insmod is not possible, they find unknown symbols as functions are undefined.

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insmod emmcfs.ko
insmod: error inserting 'emmcfs.ko': -1 Unknown symbol in module
dmesg | tail
[12785.645265] emmcfs: Unknown symbol inode_init_owner
[12785.646036] emmcfs: Unknown symbol generic_file_fsync
[12785.646444] emmcfs: Unknown symbol generic_setattr
Missing functions i got from identic files from E series kernel sources (because of kernel 2.6.35 used, more similar than F series 3.0.20 kernel..)
ideas? :x

Re: eMMCFS -- Samsung eMMC chip oriented File System

Posted: Thu Jun 13, 2013 6:24 am
by arkoPL
Hello,
I've prepared patch which works with kernel 3.3.x (it should work well with Ubuntu 3.2 LTS kernel)

Here is the patch:
patch_for_kernel_3.3.patch.gz
After compilation load module then:

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losetup /dev/loopX imagefile
mount -t emmcfs /dev/looopX /mountpoint
and everything works fine except umount.
Now umount causes call trace and kernel panic but it is possible to mount files and read them. I will work on it later.

Here are file lists from blocks 14 to 16:
block14.lst.gz
block15.lst.gz
block16.lst.gz
Best regards

Re: eMMCFS -- Samsung eMMC chip oriented File System

Posted: Thu Jun 13, 2013 6:33 am
by arkoPL
juuso wrote: 4. neither generic_setattr nor generic_file_fsync are not defined in include/linux/fs.h, so edited my desktops include/linux/fs.h and added obove the #CONFIG_MIGRATION:
SpoilerShow

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extern int generic_file_fsync(struct file *, int);
extern void generic_setattr(struct inode *inode, const struct iattr *attr);
Kernel 2.6.32 don't have this fouction you can't declare it without later definition. It causes errors below:

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insmod emmcfs.ko
insmod: error inserting 'emmcfs.ko': -1 Unknown symbol in module
dmesg | tail
[12785.645265] emmcfs: Unknown symbol inode_init_owner
[12785.646036] emmcfs: Unknown symbol generic_file_fsync
[12785.646444] emmcfs: Unknown symbol generic_setattr
Try my patch with Ubuntu LTS 3.2 kernel.

Best regards

Re: eMMCFS -- Samsung eMMC chip oriented File System

Posted: Thu Jun 13, 2013 10:25 am
by juusso
Thanks for this approach! Will check your patch asap. update: have only linux server, running kernel 3.5, patch ok, but module failed to compile.

But now I went further in other way: i installed linux kernel v2.6.35-13 (as we see there are some instructions for this kernel and this kernel is shipped with E series TVs)and compiled emmcfs.ko module without any changes in source files.
Module compiled ok, loads ok, but mounting failed
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[  685.499132] Disabling lock debugging due to kernel taint
[ 4570.968228] v.446
[ 4570.968785] [EMMCFS] version is "v.446-2013_03_04"
[ 4570.968842] [EMMCFS] git branch is "v.446-2013_03_04"
[ 4570.968855] [EMMCFS] git revhash "32be35934bf7802af38dc5d58188c3f564ed01c9"
[ 4570.968876] [EMMCFS] mounting loop0
[ 4570.970530] emmcfs-ERROR:552:emmcfs_verify_sb: SB: bad signature - 0x30207261726e750a, expected - 0x5346434d4d6531
Edit: removed the emmcfs_verify_sb function (returns always 0) in super.c, now mounting gives bad address error. Can be we need to pass correct superblock signature to open/mount the filesystem...?
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 mount -o loop ./dumps/mmcblk0p14.dmp ./img -t emmcfs
mount: Bad address
root@iam-desktop:/home/emmcfs# dmesg | tail
[  186.922528] Disabling lock debugging due to kernel taint
[  359.408211] v.446
[  359.408420] [EMMCFS] version is "v.446-2013_03_04"
[  359.408438] [EMMCFS] git branch is "v.446-2013_03_04"
[  359.408449] [EMMCFS] git revhash "32be35934bf7802af38dc5d58188c3f564ed01c9"
[  359.408472] [EMMCFS] mounting loop0
[  359.423426] emmcfs-ERROR:553:emmcfs_verify_sb: SB: bad signature - 0x30207261726e750a, expected - 0x5346434d4d6531
[  359.423467] emmcfs-ERROR:553:emmcfs_verify_sb: SB: bad signature - 0x30207261726e750a, expected - 0x5346434d4d6531
[  359.423606] attempt to access beyond end of device
[  359.423642] loop0: rw=0, want=8, limit=4
Update: same with kernel 3.0.20 (original sources, without patches applied).

Re: eMMCFS -- Samsung eMMC chip oriented File System

Posted: Thu Jun 13, 2013 5:51 pm
by arkoPL
juuso wrote:

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[ 4570.970530] emmcfs-ERROR:552:emmcfs_verify_sb: SB: bad signature - 0x30207261726e750a, expected - 0x5346434d4d6531
That's strange signature 0x5346434d4d6531 is 1eMMCFS header in reversed order from these dumps. I can't find in those files 0x30207261726e750a pattern.
juuso wrote: Edit: removed the emmcfs_verify_sb function (returns always 0) in super.c, now mounting gives bad address error. Can be we need to pass correct superblock signature to open/mount the filesystem...?
SpoilerShow

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 mount -o loop ./dumps/mmcblk0p14.dmp ./img -t emmcfs
mount: Bad address
root@iam-desktop:/home/emmcfs# dmesg | tail
[  186.922528] Disabling lock debugging due to kernel taint
[  359.408211] v.446
[  359.408420] [EMMCFS] version is "v.446-2013_03_04"
[  359.408438] [EMMCFS] git branch is "v.446-2013_03_04"
[  359.408449] [EMMCFS] git revhash "32be35934bf7802af38dc5d58188c3f564ed01c9"
[  359.408472] [EMMCFS] mounting loop0
[  359.423426] emmcfs-ERROR:553:emmcfs_verify_sb: SB: bad signature - 0x30207261726e750a, expected - 0x5346434d4d6531
[  359.423467] emmcfs-ERROR:553:emmcfs_verify_sb: SB: bad signature - 0x30207261726e750a, expected - 0x5346434d4d6531
[  359.423606] attempt to access beyond end of device
[  359.423642] loop0: rw=0, want=8, limit=4
Update: same with kernel 3.0.20 (original sources, without patches applied).
Hmmm, maybe your loop device doesn't work well. It only maps this block device with kmap and compares these first bytes. Try to copy first seven bytes from loop device to file with dd and check if it is ok.

Re: eMMCFS -- Samsung eMMC chip oriented File System

Posted: Thu Jun 13, 2013 7:20 pm
by juusso
damn, stupid me. My all dumps i was testing were damaged during unpacking from archive. :oops:
Checked once again with original module with unpatched sources and kernel 2.6.35 (and with 3.0.20 as well) .
SpoilerShow

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root@iam-desktop:/home/emmcfs# mount -o loop ./dumps/mmcblk0p23.dmp ./img -t emmcfs
root@iam-desktop:/home/emmcfs# dmesg | tail
[ 2645.374810] v.446
[ 2645.374818] [EMMCFS] version is "v.446-2013_03_04"
[ 2645.374821] [EMMCFS] git branch is "v.446-2013_03_04"
[ 2645.374824] [EMMCFS] git revhash "32be35934bf7802af38dc5d58188c3f564ed01c9"
[ 2645.374827] [EMMCFS] mounting loop0
[ 2645.375370] [EMMCFS] mkfs git branch is "v.444-2013_02_06"
[ 2645.375383] [EMMCFS] mkfs git revhash "717c292cca43c50a57c6e6eb5a0e055137e3bea9"
[ 2645.375953] mount 90
[ 2645.375965] [EMMCFS] mounted 90 times
root@iam-desktop:/home/emmcfs# ls ./img
DTV-manual.img  DTV-manual.ver  eManual.ver
root@iam-desktop:/home/emmcfs#
Mount is ok, umount provides segmentation fault. Anyway, now we have working module. :)

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# mount
<...>
/dev/loop0 on /home/emmcfs/img type emmcfs (rw)

# umount -l /dev/loop0
Segmentation fault
So, in conclusion, without any changes of sources, module is ok with kernels 2.6.35-x and 3.0.20 and may work with other kernels above 2.6.35-xx, but for correct compilation arkoPL`s patch (currently for kernels 3.3.x) is needed.

Re: eMMCFS -- Samsung eMMC chip oriented File System

Posted: Sat Jun 15, 2013 9:10 am
by arkoPL
Umount now works - I forgot to remove one #elif

Here's the patch:
umount.patch.gz
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