Bug found in Ext2Fsd 0.60

Dear all,

We just found a bug in Ext2Fsd 0.60 during code inspection: For extent-based files
that have unwritten extents, writing attempts might cause silent data corruption of
other files or the whole file system. Thought the possibility of data corruption is very
small, to keep your data safe, better not writing any data to EXT4 volumes.

We’ve removed Ext2Fsd 0.60 packages from SourceForge. Right now we are working
on resolving this issue. Likely we will release version 0.61 this weekend.

Matt Wu

Continue reading » · Rating: · Written on: 06-04-15 · Comments Off on Bug found in Ext2Fsd 0.60

Ext2Fsd 0.60 was released !

Features implemented or bugfix since V0.53:
    1, Ext4 extent writing support (developed by ngkaho1234 @ gmail.com)
       See his repository for more details:
       http://github.com/ngkaho1234/Ext3Fsd.git
    2, Size manipulation and i/o path revised for support of indirect and
       extent-based mappings
    3, 16T volume supported (tested and confirmed with 4T volume)
       Version 0.53 and previous versions only support up to 2T volume
       ticket: https://sourceforge.net/p/ext2fsd/bugs/134/
    4, Deletion acceleration: truncation optimized for indirect-based files
    5, Size-expanding disabled in IRP_MJ_CREATE for better performance.
       Windows sometimes would truncate file size back to 0
    6, Support Volume exclusive-open for e2fsprogs utils. Any attempts
       will be denied while EXT4 volume is being checked (e2fsck).
    7, FIXME:  Possible zero-content returned (requesting data from file tail)
    8, FIXME:  File ByteOffset updated for FO_SYNCHRONOUS_IO open (async i/o)
       ticket: https://sourceforge.net/p/ext2fsd/bugs/133/
    9, FIXME:  don't do byte or range round up for paging i/o requests
       ticket: https://sourceforge.net/p/ext2fsd/bugs/129/
   10, FIXME:  occasional block bitmap difference issue, cased by checksum
               caculation in uninit_bg group initializing

Supported Ext3/4 features by 0.60:
    1, flexible inode size: > 128 bytes, up to block size
    2, dir_index:    htree directory index
    3, filetype:     extra file mode in dentry
    4, large_file:   > 4G files supported
    5, sparse_super: super block backup in group descriptor
    6, uninit_bg:    fast fsck and group checksum
    7, extent:       full support with extending and shrinking.
    8, journal:      only support replay for internal journal
    9, flex_bg:      first flexible metadata group

Unsupported Ext3/4 features:
    1, journal: log-based operations, external journal
    2, EA (extended attributes), ACL support
    3, symlink creation

Features to be implemented in next release:
    1, Reparse point support (hardlink, symbolic link etc)
    2, mounted as given user: privilege checking with given uid & gid

Files descriptions:
Ext2Fsd-0.60.exe:       setup wizard for Windows systems (Win2k, Winxp,
                        Vista, Win7, Win8, Server 2003, Server 2008/R2)
Ext2Fsd-0.60.7z:        Batch setup package in 7-zip
Ext2Fsd-0.60.zip:       Batch setup package in zip
Ext2Fsd-0.60.src.7z:    Source codes of Ext3Fsd and Ext2Mgr in 7-zip
Ext2Fsd-0.60.src.zip:   Source codes of Ext3Fsd and Ext2Mgr in zip

Download link:
http://sourceforge.net/projects/ext2fsd/files/Ext2fsd/0.60/

Files checksum:
C:\Works\Ext2fsd\0.60>sha1sum Ext2Fsd-0.60*
de61f306f9a68590207cc598e84edd7840be23ed *Ext2Fsd-0.60.7z
74937c4f5ef2eb591486bec744444ee280d595db *Ext2Fsd-0.60.exe
8a0e53a3b2b0d56e1d764ae88ff38bbaddb5bc4a *Ext2Fsd-0.60.src.7z
71dfaebfd447f7aa4c0807302ab82839dd0f43ba *Ext2Fsd-0.60.src.zip
944925882c7a279f2a5bb5e7d91c9e3b1c84f3bc *Ext2Fsd-0.60.zip

WARNINGS:
 
    The driver may crash your system and ruin your data unexpectedly,
    since there might be software conflicts and I could only test it
    on some of the popular platforms. You should use it with care and
    use it at your own risk!

Matt <mattwu@163.com>
https://www.ext2fsd.com

Continue reading » · Rating: · Written on: 06-01-15 · Comments Off on Ext2Fsd 0.60 was released !