Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf I believe that developers/sysadmins/researchers/students may find help with it. regards, Rami Rosen http://ramirose.wix.com/ramirosen
El 28/01/13 17:53, Rami Rosen escribió:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Thank you for share it. It seem very interesting.
Great! Thank you! 2013/1/28 Román <roman@mailoo.org>
El 28/01/13 17:53, Rami Rosen escribió:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Thank you for share it. It seem very interesting.
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
On Mon, Jan 28, 2013 at 4:53 PM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
__________________________
very well done! thank you for sharing.
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-- Thank you Warm Regards Anuz
On Mon, Jan 28, 2013 at 10:23 PM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
Thanks for your effort Rami. Really appreciate it. Regards, -mandeep
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
On Mon, Jan 28, 2013 at 11:53 PM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it:
Rami, I really appreciate your open publication. Thumbs up! -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com
Thanks Rami. It is helpful for many newbies like me. Regards, Srinidhi On Tue, Jan 29, 2013 at 1:14 PM, Mulyadi Santosa <mulyadi.santosa@gmail.com>wrote:
On Mon, Jan 28, 2013 at 11:53 PM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it:
Rami, I really appreciate your open publication. Thumbs up!
-- regards,
Mulyadi Santosa Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
On Tue, Jan 29, 2013 at 1:14 PM, Mulyadi Santosa <mulyadi.santosa@gmail.com> wrote:
On Mon, Jan 28, 2013 at 11:53 PM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: Though I am not a networking guy but this detailed tome is really good but unfortunately we don't have same for many other systems such as scheduler and workqueues. Probably it is because these systems keep on evolving and there are many LOC added on a daily basis.
Rami, I really appreciate your open publication. Thumbs up!
-- regards,
Mulyadi Santosa Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Hi, Thanks for the link, great document to study. 2013/1/29 Gabor Podri <podrigabor@gmail.com>
Hi Rami,
it is great stuff. Thank you for sharing it!
regards, podri
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-- Atentamente. Luis Valdes luisvaldes88@gmail.com (0994) 205 781
Thank you for sharing! 2013/1/29 Rami Rosen <roszenrami@gmail.com>
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Thanks for sharing the document. I hope we could have such documents for other subsystems as well. Regards Shubham On 28-Jan-13 10:23 PM, Rami Rosen wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
HI, I will try to write something for Linux Filesystems (and maybe for other subsystems) but this will probably take a lot of time. Regards, Rami Rosen http://ramirose.wix.com/ramirosen On Wed, Jan 30, 2013 at 5:44 PM, shubham <kernel.shubham@gmail.com> wrote:
Thanks for sharing the document.
I hope we could have such documents for other subsystems as well.
Regards Shubham
On 28-Jan-13 10:23 PM, Rami Rosen wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Thanks Rami, I am also trying to understand ext3 and write some document for the same. Regards Shubham On 31-Jan-13 12:51 AM, Rami Rosen wrote:
HI, I will try to write something for Linux Filesystems (and maybe for other subsystems) but this will probably take a lot of time.
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Wed, Jan 30, 2013 at 5:44 PM, shubham <kernel.shubham@gmail.com> wrote:
Thanks for sharing the document.
I hope we could have such documents for other subsystems as well.
Regards Shubham
On 28-Jan-13 10:23 PM, Rami Rosen wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Hi, Have you considered to start with ext4? it seems that ext3, ext2 are a bit out of fashion, Regards, Rami Rosen http://ramirose.wix.com/ramirosen On Thu, Jan 31, 2013 at 8:58 PM, shubham <kernel.shubham@gmail.com> wrote:
Thanks Rami,
I am also trying to understand ext3 and write some document for the same.
Regards Shubham
On 31-Jan-13 12:51 AM, Rami Rosen wrote:
HI, I will try to write something for Linux Filesystems (and maybe for other subsystems) but this will probably take a lot of time.
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Wed, Jan 30, 2013 at 5:44 PM, shubham <kernel.shubham@gmail.com> wrote:
Thanks for sharing the document.
I hope we could have such documents for other subsystems as well.
Regards Shubham
On 28-Jan-13 10:23 PM, Rami Rosen wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Hey, Thanks for such sharing document.
Date: Thu, 31 Jan 2013 22:45:53 +0200 Subject: Re: Linux Kernel Networking document (free, 178 pages doc) From: roszenrami@gmail.com To: kernel.shubham@gmail.com CC: kernelnewbies@kernelnewbies.org
Hi, Have you considered to start with ext4? it seems that ext3, ext2 are a bit out of fashion,
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Thu, Jan 31, 2013 at 8:58 PM, shubham <kernel.shubham@gmail.com> wrote:
Thanks Rami,
I am also trying to understand ext3 and write some document for the same.
Regards Shubham
On 31-Jan-13 12:51 AM, Rami Rosen wrote:
HI, I will try to write something for Linux Filesystems (and maybe for other subsystems) but this will probably take a lot of time.
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Wed, Jan 30, 2013 at 5:44 PM, shubham <kernel.shubham@gmail.com> wrote:
Thanks for sharing the document.
I hope we could have such documents for other subsystems as well.
Regards Shubham
On 28-Jan-13 10:23 PM, Rami Rosen wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Hi, I understand that ext2 and ext3 are kind of obsolete now. But AFAIK, there is not much difference in ext3 and ext4. Moreover for a newbie , it is better to start with ext3. What you think ? Regards Shubham On Fri, Feb 1, 2013 at 2:15 AM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi, Have you considered to start with ext4? it seems that ext3, ext2 are a bit out of fashion,
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Thu, Jan 31, 2013 at 8:58 PM, shubham <kernel.shubham@gmail.com> wrote:
Thanks Rami,
I am also trying to understand ext3 and write some document for the same.
Regards Shubham
On 31-Jan-13 12:51 AM, Rami Rosen wrote:
HI, I will try to write something for Linux Filesystems (and maybe for other subsystems) but this will probably take a lot of time.
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Wed, Jan 30, 2013 at 5:44 PM, shubham <kernel.shubham@gmail.com>
wrote:
Thanks for sharing the document.
I hope we could have such documents for other subsystems as well.
Regards Shubham
On 28-Jan-13 10:23 PM, Rami Rosen wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Hi,
ext2 and ext3 are kind of obsolete now.
Indeed, ext4 was integrated into Linux kernel back in 2008. Amongs its known features which do not exist in ext3 are support for huge files (like 1 EB (exabyte or somtimes termed exbibyte); 1 EB is 1024 PB (petabyte) whereas 1 PB is 1024 TB (terabyte). a directory can contain a maximum of 64,000 subdirectories (whereas we have 32,000 in ext3) Amongst its other features are Journal checksumming, Multiblock allocator, Faster file system checking and more. If you prefer to start with simpler implementations, ext3 is of course simpler, and of course ext2 is even simpler than ext3. But in case you intend to start with ext2/ext3, and later perform a pass on all your documentation to update it to ext4, take into consideration that this will take quite a time; depending on how deep you intend to delve into implementation details. Good luck! Regards, Rami Rosen http://ramirose.wix.com/ramirosen On Sat, Feb 2, 2013 at 11:43 AM, Shubham Sharma <kernel.shubham@gmail.com> wrote:
Hi,
I understand that ext2 and ext3 are kind of obsolete now. But AFAIK, there is not much difference in ext3 and ext4.
Moreover for a newbie , it is better to start with ext3. What you think ?
Regards Shubham
On Fri, Feb 1, 2013 at 2:15 AM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi, Have you considered to start with ext4? it seems that ext3, ext2 are a bit out of fashion,
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Thu, Jan 31, 2013 at 8:58 PM, shubham <kernel.shubham@gmail.com> wrote:
Thanks Rami,
I am also trying to understand ext3 and write some document for the same.
Regards Shubham
On 31-Jan-13 12:51 AM, Rami Rosen wrote:
HI, I will try to write something for Linux Filesystems (and maybe for other subsystems) but this will probably take a lot of time.
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Wed, Jan 30, 2013 at 5:44 PM, shubham <kernel.shubham@gmail.com> wrote:
Thanks for sharing the document.
I hope we could have such documents for other subsystems as well.
Regards Shubham
On 28-Jan-13 10:23 PM, Rami Rosen wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
generally, anything u write for ext2, should still be valid for ext3, and ext4. in the sense that the features are backward compatible. sizing limits may have increased, but OLD working mechanism should still be valid....except for some. so ext2 fs should still be mountable as ext4, but not vice versa, once some flag is enabled (I think it is xattr). and if the flag is not enabled, and the journal logs is clean, then ext4 fs is also mountable as ext2 fs: http://superuser.com/questions/408822/ext4-converted-mounted-as-ext2 http://computer-forensics.sans.org/blog/2011/06/14/digital-forensics-mountin... http://en.wikipedia.org/wiki/Extended_file_attributes On Sun, Feb 3, 2013 at 12:26 AM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi,
ext2 and ext3 are kind of obsolete now.
Indeed, ext4 was integrated into Linux kernel back in 2008. Amongs its known features which do not exist in ext3 are support for huge files (like 1 EB (exabyte or somtimes termed exbibyte); 1 EB is 1024 PB (petabyte) whereas 1 PB is 1024 TB (terabyte). a directory can contain a maximum of 64,000 subdirectories (whereas we have 32,000 in ext3) Amongst its other features are Journal checksumming, Multiblock allocator, Faster file system checking and more.
If you prefer to start with simpler implementations, ext3 is of course simpler, and of course ext2 is even simpler than ext3.
But in case you intend to start with ext2/ext3, and later perform a pass on all your documentation to update it to ext4, take into consideration that this will take quite a time; depending on how deep you intend to delve into implementation details.
Good luck!
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Sat, Feb 2, 2013 at 11:43 AM, Shubham Sharma <kernel.shubham@gmail.com> wrote:
Hi,
I understand that ext2 and ext3 are kind of obsolete now. But AFAIK, there is not much difference in ext3 and ext4.
Moreover for a newbie , it is better to start with ext3. What you think ?
Regards Shubham
On Fri, Feb 1, 2013 at 2:15 AM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi, Have you considered to start with ext4? it seems that ext3, ext2 are a bit out of fashion,
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Thu, Jan 31, 2013 at 8:58 PM, shubham <kernel.shubham@gmail.com>
wrote:
Thanks Rami,
I am also trying to understand ext3 and write some document for the same.
Regards Shubham
On 31-Jan-13 12:51 AM, Rami Rosen wrote:
HI, I will try to write something for Linux Filesystems (and maybe for other subsystems) but this will probably take a lot of time.
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Wed, Jan 30, 2013 at 5:44 PM, shubham <kernel.shubham@gmail.com> wrote:
Thanks for sharing the document.
I hope we could have such documents for other subsystems as well.
Regards Shubham
On 28-Jan-13 10:23 PM, Rami Rosen wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it:
http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
-- Regards, Peter Teoh
(Why is this a top-posted message thread? Please stop creating these.) Only the first link says that the ext2 driver can mount a ext4 filesystem (if the journal is clean). I'm confident that is wrong. Ext4 has several on-disk features that are not backward compatible. There is a binary set of flags which is set at mkfs time as to which of those features were enabled by mkfs.ext4. A ext3 doc would only describe a ext4 filesystem with all of those flags off. Thus a ext3 doc describing the on disk structure is not a waste of time, but it becomes a subset of a full ext4 doc describing the on disk structure. I would recommend that documenting that set of flags be the first documentation effort. Greg Peter Teoh <htmldeveloper@gmail.com> wrote:
generally, anything u write for ext2, should still be valid for ext3, and ext4. in the sense that the features are backward compatible. sizing limits may have increased, but OLD working mechanism should still be valid....except for some.
so ext2 fs should still be mountable as ext4, but not vice versa, once some flag is enabled (I think it is xattr). and if the flag is not enabled, and the journal logs is clean, then ext4 fs is also mountable as ext2 fs:
http://superuser.com/questions/408822/ext4-converted-mounted-as-ext2
http://computer-forensics.sans.org/blog/2011/06/14/digital-forensics-mountin...
http://en.wikipedia.org/wiki/Extended_file_attributes
On Sun, Feb 3, 2013 at 12:26 AM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi,
ext2 and ext3 are kind of obsolete now.
Indeed, ext4 was integrated into Linux kernel back in 2008. Amongs its known features which do not exist in ext3 are support for huge files (like 1 EB (exabyte or somtimes termed exbibyte); 1 EB is 1024 PB (petabyte) whereas 1 PB is 1024 TB (terabyte). a directory can contain a maximum of 64,000 subdirectories (whereas we have 32,000 in ext3) Amongst its other features are Journal checksumming, Multiblock allocator, Faster file system checking and more.
If you prefer to start with simpler implementations, ext3 is of course simpler, and of course ext2 is even simpler than ext3.
But in case you intend to start with ext2/ext3, and later perform a pass on all your documentation to update it to ext4, take into consideration that this will take quite a time; depending on how deep you intend to delve into implementation details.
Good luck!
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Sat, Feb 2, 2013 at 11:43 AM, Shubham Sharma <kernel.shubham@gmail.com> wrote:
Hi,
I understand that ext2 and ext3 are kind of obsolete now. But AFAIK, there is not much difference in ext3 and ext4.
Moreover for a newbie , it is better to start with ext3. What you think ?
Regards Shubham
On Fri, Feb 1, 2013 at 2:15 AM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi, Have you considered to start with ext4? it seems that ext3, ext2 are a bit out of fashion,
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Thu, Jan 31, 2013 at 8:58 PM, shubham
<kernel.shubham@gmail.com> wrote:
Thanks Rami,
I am also trying to understand ext3 and write some document for the same.
Regards Shubham
On 31-Jan-13 12:51 AM, Rami Rosen wrote:
HI, I will try to write something for Linux Filesystems (and maybe
for
other subsystems) but this will probably take a lot of time.
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Wed, Jan 30, 2013 at 5:44 PM, shubham <kernel.shubham@gmail.com> wrote:
Thanks for sharing the document.
I hope we could have such documents for other subsystems as
well.
Regards Shubham
On 28-Jan-13 10:23 PM, Rami Rosen wrote:
Hi everyone, You can find here an up to date and detailed document in pdf
(178
pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it:
http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may
find
help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
-- Sent from my Android phone with K-9 Mail. Please excuse my brevity.
I took a minute to find the list of flags: Look for s_feature_incompat and s_feature_ro_compat at https://ext4.wiki.kernel.org/index.php/Ext4_Disk_Layout The incompat flags are of most interest for the discussion. If any of those are set, neither the ext2 nor the ext3 driver can mount the filesystem unless they have been extended to support these features: === Incompatible feature set. If the kernel or fsck doesn't understand one of these bits, it should stop. Any of: 0x1 Compression (INCOMPAT_COMPRESSION). 0x2 Directory entries record the file type. See ext4_dir_entry_2 below (INCOMPAT_FILETYPE). 0x4 Filesystem needs recovery (INCOMPAT_RECOVER). 0x8 Filesystem has a separate journal device (INCOMPAT_JOURNAL_DEV). 0x10 Meta block groups. See the earlier discussion of this feature (INCOMPAT_META_BG). 0x40 Files in this filesystem use extents (INCOMPAT_EXTENTS). 0x80 Enable a filesystem size of 2^64 blocks (INCOMPAT_64BIT). 0x100 Multiple mount protection. Not implemented (INCOMPAT_MMP). 0x200 Flexible block groups. See the earlier discussion of this feature (INCOMPAT_FLEX_BG). 0x400 Inodes can be used for large extended attributes (INCOMPAT_EA_INODE). (Not implemented?) 0x1000 Data in directory entry (INCOMPAT_DIRDATA). (Not implemented?) 0x2000 Never used (INCOMPAT_BG_USE_META_CSUM). Probably free. 0x4000 Large directory >2GB or 3-level htree (INCOMPAT_LARGEDIR). 0x8000 Data in inode (INCOMPAT_INLINE_DATA). == Greg On Mon, Feb 4, 2013 at 8:49 AM, Greg Freemyer <greg.freemyer@gmail.com> wrote:
(Why is this a top-posted message thread? Please stop creating these.)
Only the first link says that the ext2 driver can mount a ext4 filesystem (if the journal is clean). I'm confident that is wrong. Ext4 has several on-disk features that are not backward compatible. There is a binary set of flags which is set at mkfs time as to which of those features were enabled by mkfs.ext4.
A ext3 doc would only describe a ext4 filesystem with all of those flags off.
Thus a ext3 doc describing the on disk structure is not a waste of time, but it becomes a subset of a full ext4 doc describing the on disk structure.
I would recommend that documenting that set of flags be the first documentation effort.
Greg
Peter Teoh <htmldeveloper@gmail.com> wrote:
generally, anything u write for ext2, should still be valid for ext3, and ext4. in the sense that the features are backward compatible. sizing limits may have increased, but OLD working mechanism should still be valid....except for some.
so ext2 fs should still be mountable as ext4, but not vice versa, once some flag is enabled (I think it is xattr). and if the flag is not enabled, and the journal logs is clean, then ext4 fs is also mountable as ext2 fs:
http://superuser.com/questions/408822/ext4-converted-mounted-as-ext2
http://computer-forensics.sans.org/blog/2011/06/14/digital-forensics-mountin...
http://en.wikipedia.org/wiki/Extended_file_attributes
On Sun, Feb 3, 2013 at 12:26 AM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi,
ext2 and ext3 are kind of obsolete now.
Indeed, ext4 was integrated into Linux kernel back in 2008. Amongs its known features which do not exist in ext3 are support for huge files (like 1 EB (exabyte or somtimes termed exbibyte); 1 EB is 1024 PB (petabyte) whereas 1 PB is 1024 TB (terabyte). a directory can contain a maximum of 64,000 subdirectories (whereas we have 32,000 in ext3) Amongst its other features are Journal checksumming, Multiblock allocator, Faster file system checking and more.
If you prefer to start with simpler implementations, ext3 is of course simpler, and of course ext2 is even simpler than ext3.
But in case you intend to start with ext2/ext3, and later perform a pass on all your documentation to update it to ext4, take into consideration that this will take quite a time; depending on how deep you intend to delve into implementation details.
Good luck!
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Sat, Feb 2, 2013 at 11:43 AM, Shubham Sharma <kernel.shubham@gmail.com> wrote:
Hi,
I understand that ext2 and ext3 are kind of obsolete now. But AFAIK, there is not much difference in ext3 and ext4.
Moreover for a newbie , it is better to start with ext3. What you think ?
Regards Shubham
On Fri, Feb 1, 2013 at 2:15 AM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi, Have you considered to start with ext4? it seems that ext3, ext2 are a bit out of fashion,
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Thu, Jan 31, 2013 at 8:58 PM, shubham
<kernel.shubham@gmail.com> wrote:
Thanks Rami,
I am also trying to understand ext3 and write some document for the same.
Regards Shubham
On 31-Jan-13 12:51 AM, Rami Rosen wrote:
HI, I will try to write something for Linux Filesystems (and maybe
for
other subsystems) but this will probably take a lot of time.
Regards, Rami Rosen http://ramirose.wix.com/ramirosen
On Wed, Jan 30, 2013 at 5:44 PM, shubham <kernel.shubham@gmail.com> wrote:
Thanks for sharing the document.
I hope we could have such documents for other subsystems as
well.
Regards Shubham
On 28-Jan-13 10:23 PM, Rami Rosen wrote:
Hi everyone, You can find here an up to date and detailed document in pdf
(178
pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it:
http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may
find
help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
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-- Greg Freemyer Intelligent Avatar Corporation Chief Technology Officer http://www.linkedin.com/in/gregfreemyer CNN/TruTV Aired Forensic Imaging Demo - http://insession.blogs.cnn.com/2010/03/23/how-computer-evidence-gets-retriev... (678) 653-4860
Good sharing and info. I thought it is also useful to share your lectures materials at: http://www.haifux.org/rami_rosen.html which I must highlight has lots of work done since 2007. Keep up the good work!! On Tue, Jan 29, 2013 at 12:53 AM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
-- Regards, Peter Teoh
http://www.haifux.org/lectures.html This link has even more lectures. On Mon, Feb 4, 2013 at 11:55 AM, Peter Teoh <htmldeveloper@gmail.com> wrote:
Good sharing and info. I thought it is also useful to share your lectures materials at:
http://www.haifux.org/rami_rosen.html
which I must highlight has lots of work done since 2007. Keep up the good work!!
On Tue, Jan 29, 2013 at 12:53 AM, Rami Rosen <roszenrami@gmail.com> wrote:
Hi everyone, You can find here an up to date and detailed document in pdf (178 pages) about Linux Kernel Networking; going deep into design and implementation details as well as the theory behind it: http://media.wix.com/ugd//295986_931b8bcf34d93419d46e05b5aa5d0216.pdf
I believe that developers/sysadmins/researchers/students may find help with it.
regards, Rami Rosen
http://ramirose.wix.com/ramirosen
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
-- Regards, Peter Teoh
-- Regards, Peter Teoh
participants (16)
-
anish singh -
Anuz Pratap Singh Tomar -
Gabor Podri -
Greg Freemyer -
Kaushal Billore -
Luis Valdés -
Mandeep Sandhu -
Mulyadi Santosa -
Peter Teoh -
Rami Rosen -
Román -
shubham -
Shubham Sharma
-
Srinidhi K V -
Thiago Peixoto -
卜晖