Re: [Gluster-devel] update-link-count-parent POSIX xlator parameter
On Wed, Aug 20, 2014 at 10:04 PM, Prashanth Pai p...@redhat.com wrote: Hi, I recently came across this when I was looking for various ways to convert GFID to Path[1]. I have tested build-pgfid option for basic sanity. It's documented in the commit msg of change[2]. Found one small issue[3]. There could be others. Users should be aware that these xattrs generated only for newly created dirs/files and are not built for already existing dirs/files. [1]: https://github.com/prashanthpai/sof-object-listing/blob/master/changelog/gfid-to-path.md [2]: http://review.gluster.org/5951 [3]: http://review.gluster.org/8352 Explored quite a few options here - https://gist.github.com/harshavardhana/b5d3c69db5312b84022f - was one approach which was worked by Brad Hubbard which makes used of kernel dentry caches. - For ext4 you have # debugfs 'ncheck inode_num' device - XFS provides something similar, but requires a umount # xfs_ncheck -i ino device - Then stumbled across this since its specifically used by Quota, do not know how hard its to expose this. But Avati indicated that this would involve additional overheads for every call() - The best possible solution is to use a database for such a mapping (quite tricky) and requires a lot of internal work. So in the end haven't come across an easier way out of this :-) -- Religious confuse piety with mere ritual, the virtuous confuse regulation with outcomes ___ Gluster-devel mailing list Gluster-devel@gluster.org http://supercolony.gluster.org/mailman/listinfo/gluster-devel
Re: [Gluster-devel] update-link-count-parent POSIX xlator parameter
Hi Prasanth, Its worth to have in our GlusterFS source doc . Can you send a patch on this ? --Humble On Thu, Aug 21, 2014 at 10:34 AM, Prashanth Pai p...@redhat.com wrote: Hi, I recently came across this when I was looking for various ways to convert GFID to Path[1]. I have tested build-pgfid option for basic sanity. It's documented in the commit msg of change[2]. Found one small issue[3]. There could be others. Users should be aware that these xattrs generated only for newly created dirs/files and are not built for already existing dirs/files. [1]: https://github.com/prashanthpai/sof-object-listing/blob/master/changelog/gfid-to-path.md [2]: http://review.gluster.org/5951 [3]: http://review.gluster.org/8352 Regards, -Prashanth Pai - Original Message - From: Harshavardhana har...@harshavardhana.net To: Ben England bengl...@redhat.com Cc: gluster-devel gluster-devel@gluster.org Sent: Thursday, August 21, 2014 2:57:25 AM Subject: Re: [Gluster-devel] update-link-count-parent POSIX xlator parameter On Wed, Aug 20, 2014 at 1:55 PM, Ben England bengl...@redhat.com wrote: What is update-link-count-parent POSIX xlator parameter for? Is it ever set by anyone and why? It appears to be off by default. Didn't see this documented, but the log message in posix.c says: update-link-count-parent is enabled. Thus for each file an extended attribute representing the number of hardlinks for that file within the same parent directory is set. Why would this be necessary? It was supposed to be used by Quota or it uses it internally i am not sure for ancestry paths and gfid to path conversion - AFAIK # gluster volume set volname build-pgfid on Enables this feature. Never tested it personally. -- Religious confuse piety with mere ritual, the virtuous confuse regulation with outcomes ___ Gluster-devel mailing list Gluster-devel@gluster.org http://supercolony.gluster.org/mailman/listinfo/gluster-devel ___ Gluster-devel mailing list Gluster-devel@gluster.org http://supercolony.gluster.org/mailman/listinfo/gluster-devel ___ Gluster-devel mailing list Gluster-devel@gluster.org http://supercolony.gluster.org/mailman/listinfo/gluster-devel
Re: [Gluster-devel] update-link-count-parent POSIX xlator parameter
sure! Regards, -Prashanth Pai - Original Message - From: Humble Devassy Chirammal humble.deva...@gmail.com To: Prashanth Pai p...@redhat.com Cc: Harshavardhana har...@harshavardhana.net, Ben England bengl...@redhat.com, gluster-devel gluster-devel@gluster.org Sent: Thursday, August 21, 2014 12:03:58 PM Subject: Re: [Gluster-devel] update-link-count-parent POSIX xlator parameter Hi Prasanth, Its worth to have in our GlusterFS source doc . Can you send a patch on this ? --Humble On Thu, Aug 21, 2014 at 10:34 AM, Prashanth Pai p...@redhat.com wrote: Hi, I recently came across this when I was looking for various ways to convert GFID to Path[1]. I have tested build-pgfid option for basic sanity. It's documented in the commit msg of change[2]. Found one small issue[3]. There could be others. Users should be aware that these xattrs generated only for newly created dirs/files and are not built for already existing dirs/files. [1]: https://github.com/prashanthpai/sof-object-listing/blob/master/changelog/gfid-to-path.md [2]: http://review.gluster.org/5951 [3]: http://review.gluster.org/8352 Regards, -Prashanth Pai - Original Message - From: Harshavardhana har...@harshavardhana.net To: Ben England bengl...@redhat.com Cc: gluster-devel gluster-devel@gluster.org Sent: Thursday, August 21, 2014 2:57:25 AM Subject: Re: [Gluster-devel] update-link-count-parent POSIX xlator parameter On Wed, Aug 20, 2014 at 1:55 PM, Ben England bengl...@redhat.com wrote: What is update-link-count-parent POSIX xlator parameter for? Is it ever set by anyone and why? It appears to be off by default. Didn't see this documented, but the log message in posix.c says: update-link-count-parent is enabled. Thus for each file an extended attribute representing the number of hardlinks for that file within the same parent directory is set. Why would this be necessary? It was supposed to be used by Quota or it uses it internally i am not sure for ancestry paths and gfid to path conversion - AFAIK # gluster volume set volname build-pgfid on Enables this feature. Never tested it personally. -- Religious confuse piety with mere ritual, the virtuous confuse regulation with outcomes ___ Gluster-devel mailing list Gluster-devel@gluster.org http://supercolony.gluster.org/mailman/listinfo/gluster-devel ___ Gluster-devel mailing list Gluster-devel@gluster.org http://supercolony.gluster.org/mailman/listinfo/gluster-devel ___ Gluster-devel mailing list Gluster-devel@gluster.org http://supercolony.gluster.org/mailman/listinfo/gluster-devel
[Gluster-devel] update-link-count-parent POSIX xlator parameter
What is update-link-count-parent POSIX xlator parameter for? Is it ever set by anyone and why? It appears to be off by default. Didn't see this documented, but the log message in posix.c says: update-link-count-parent is enabled. Thus for each file an extended attribute representing the number of hardlinks for that file within the same parent directory is set. Why would this be necessary? background: I'm trying to see where various xattr calls per file read are coming from. ___ Gluster-devel mailing list Gluster-devel@gluster.org http://supercolony.gluster.org/mailman/listinfo/gluster-devel
Re: [Gluster-devel] update-link-count-parent POSIX xlator parameter
On Wed, Aug 20, 2014 at 1:55 PM, Ben England bengl...@redhat.com wrote: What is update-link-count-parent POSIX xlator parameter for? Is it ever set by anyone and why? It appears to be off by default. Didn't see this documented, but the log message in posix.c says: update-link-count-parent is enabled. Thus for each file an extended attribute representing the number of hardlinks for that file within the same parent directory is set. Why would this be necessary? It was supposed to be used by Quota or it uses it internally i am not sure for ancestry paths and gfid to path conversion - AFAIK # gluster volume set volname build-pgfid on Enables this feature. Never tested it personally. -- Religious confuse piety with mere ritual, the virtuous confuse regulation with outcomes ___ Gluster-devel mailing list Gluster-devel@gluster.org http://supercolony.gluster.org/mailman/listinfo/gluster-devel
Re: [Gluster-devel] update-link-count-parent POSIX xlator parameter
Hi, I recently came across this when I was looking for various ways to convert GFID to Path[1]. I have tested build-pgfid option for basic sanity. It's documented in the commit msg of change[2]. Found one small issue[3]. There could be others. Users should be aware that these xattrs generated only for newly created dirs/files and are not built for already existing dirs/files. [1]: https://github.com/prashanthpai/sof-object-listing/blob/master/changelog/gfid-to-path.md [2]: http://review.gluster.org/5951 [3]: http://review.gluster.org/8352 Regards, -Prashanth Pai - Original Message - From: Harshavardhana har...@harshavardhana.net To: Ben England bengl...@redhat.com Cc: gluster-devel gluster-devel@gluster.org Sent: Thursday, August 21, 2014 2:57:25 AM Subject: Re: [Gluster-devel] update-link-count-parent POSIX xlator parameter On Wed, Aug 20, 2014 at 1:55 PM, Ben England bengl...@redhat.com wrote: What is update-link-count-parent POSIX xlator parameter for? Is it ever set by anyone and why? It appears to be off by default. Didn't see this documented, but the log message in posix.c says: update-link-count-parent is enabled. Thus for each file an extended attribute representing the number of hardlinks for that file within the same parent directory is set. Why would this be necessary? It was supposed to be used by Quota or it uses it internally i am not sure for ancestry paths and gfid to path conversion - AFAIK # gluster volume set volname build-pgfid on Enables this feature. Never tested it personally. -- Religious confuse piety with mere ritual, the virtuous confuse regulation with outcomes ___ Gluster-devel mailing list Gluster-devel@gluster.org http://supercolony.gluster.org/mailman/listinfo/gluster-devel ___ Gluster-devel mailing list Gluster-devel@gluster.org http://supercolony.gluster.org/mailman/listinfo/gluster-devel
