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Old 04-04-2012, 10:16 AM   #1
jsveiga
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Registered: Aug 2005
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Distribution: debian on servers and embedded, kubuntu elsewhere
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Compressed fs with acl (posix) support?


Hello (running debian squeeze),

I use a perl script which creates incremental/hardlinked backups of my samba shares, tar-bz2'ing each file individually (tar is for preserving directory perms for easier recovering).

These snapshots are also shared for the users to be able to go back in time fetching modified/deleted files.

I would like to replace this schema with rsnapsot (rsync based) on a compressed filesystem, but my shares use ACL (posix, setfacl), mapped by samba to the windows clients.

I tried fusecompress and zfs-on-fuse, but they did not work with acl (at least not with setfacl).

I read somewhere that posix acls are obsolete, so zfs does not support it, supporting windows and nfsv4 acls instead (http://compgroups.net/comp.unix.sola...x-style/220004). Can these replace posix acls for the samba mapping on a linux/fuse zfs?

Is there a way to have ACLs for the samba clients, without posix acls support on the server filesystem?

Or is there another compressed filesystem (not read-only) for linux (debian) which supports the "same" acl mapped by samba?

Thank you!

Joao S Veiga

Last edited by jsveiga; 04-04-2012 at 10:22 AM.
 
Old 04-17-2012, 07:34 AM   #2
Felipe
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Hello:

No tried but have you tried with:
Quote:
- star http://linux.die.net/man/1/star
- smbtar (with -acl option) http://linux.die.net/man/1/smbtar
Regards
 
Old 04-17-2012, 07:39 AM   #3
Felipe
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I forget...

You say you are using rsync. And rsync also supports acl (http://linux.die.net/man/1/rsync)
Quote:
-A, --acls preserve ACLs (implies -p) [non-standard]
 
Old 04-17-2012, 04:05 PM   #4
jsveiga
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Thank you Felipe, but star/smbtar do not create the transparent-for-the-end-user multiple historical copies as rsnapshot or my script or rsync (with the proper options) do.

For rsync -A to work, the filesystem to where it is writing the files has to support acls. What you suggested would work for an acl-supporting filesystem, but I want a compressed filesystem, and so far I could find none with posix acl support.

The script I use today compresses each modified file (tar-bz2) and sets the permissions/acls on the tarbz2 to the same as the original file (so that the end users can/cannot access the backups according to the original perms). I hardlink the tarbz2 of unmodified files of the previous-day to the current day backup (similar to rsnapshot). I'd like to ditch my script to use rsnapshot, but then I'd need much more disk space for the backup images, hence the need of a compresses filesystem with posix acl support.

(before someone asks: I use tarbz2 and not simply bz2 so I have the whole path/file perms stored in the compressed file too - easier to restore)
 
  


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