ext2fs documentation

[octavio]

Hello ,i'm searching info about ext2fs structure but all i have found are overviews and data does not match with the ext2fs i have on my hard disk
has someone a doc good enought to write drivers?

[Brynet-Inc]

After searching Google, I've found a few sites that might be helpful to you..

http://www.nongnu.org/ext2-doc/ seems rather complete, if not slighly dated...

Other helpful sites:
http://web.mit.edu/tytso/www/linux/ext2intro.html
http://uranus.it.swin.edu.au/~jn/explore2fs/es2fs.htm

Optionally, OpenBSD/NetBSD and FreeBSD all have BSD-style licenced implementations you can look at, and of coarse, Linux has GPL source available as well.

Good luck..

[octavio]

Thanks,the third link seems to be complete,the first two are only a overview.
is ext2fs limited to 4GB filesize?

[JamesM]

Hi,

I've had no problems whatsoever regarding data on the internet and current implementations of ext2/ext3. The standard ext2 spec will get you well on your way - I would advise you to look inwards at your own implementation if something doesn't play right - it works fine for me.

Ext2 is *not* limited to 4GB, because it uses an indirection system - read the manual.

[octavio]

Hi,

Ext2 is *not* limited to 4GB, because it uses an indirection system - read the manual.

what manual?

[AJ]

See Brynet's post.

[octavio]

Ext2 is *not* limited to 4GB, because it uses an indirection system - read the manual.

Not sure if i'm reading the same manual but

1.5.3. i_size
32bit value indicating the size of the file in bytes.

[JamesM]

1.5.16. i_dir_acl

32bit value used to indicate the "high size" of the file. In previous revisions this value was always 0.

Which makes a 64 bit value (i_size | (i_dir_acl << 32)).