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Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies
From: |
Dave Chinner |
Subject: |
Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies |
Date: |
Thu, 14 Feb 2013 17:10:02 +1100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Feb 13, 2013 at 05:20:52PM -0500, Theodore Ts'o wrote:
> Telldir() and seekdir() are basically implementation horrors for any
> file system that is using anything other than a simple array of
> directory entries ala the V7 Unix file system or the BSD FFS. For any
> file system which is using a more advanced data structure, like
> b-trees hash trees, etc, there **can't** possibly be a "offset" into a
> readdir stream.
I'll just point you to this:
http://marc.info/?l=linux-ext4&m=136081996316453&w=2
so you can see that XFS implements what you say can't possibly be
done. ;)
FWIW, that post only talked about the data segment. I didn't mention
that XFS has 2 other segments in the directory file (both beyond
EOF) for the directory data indexes. One contains the name-hash btree
index used for name based lookups and the other contains a freespace
index for tracking free space in the data segment.
IOWs persistent, deterministic, low cost telldir/seekdir behaviour
was a problem solved in the 1990s. :)
Cheers,
Dave.
--
Dave Chinner
address@hidden
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, (continued)
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, Theodore Ts'o, 2013/02/13
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, Joe Julian, 2013/02/13
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, J. Bruce Fields, 2013/02/13
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, Theodore Ts'o, 2013/02/13
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, Anand Avati, 2013/02/13
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, J. Bruce Fields, 2013/02/13
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, Theodore Ts'o, 2013/02/13
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, Anand Avati, 2013/02/13
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, J. Bruce Fields, 2013/02/14
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, J. Bruce Fields, 2013/02/14
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies,
Dave Chinner <=
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, J. Bruce Fields, 2013/02/14
- Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, Dave Chinner, 2013/02/14
- [Gluster-devel] Language Bindings and Data Serialization in Gluster, Brad Childs, 2013/02/15
- Re: [Gluster-devel] Language Bindings and Data Serialization in Gluster, Jay Vyas, 2013/02/15
Message not available
Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies, John Mark Walker, 2013/02/13