On 25 Jan 2018 8:43 am, "Lian, George (NSB - CN/Hangzhou)" < george.l...@nokia-sbell.com> wrote:
Hi, I suppose the zero filled attr is for performance consider to NFS, but for fuse, it will lead issue such like hard LINK FOP, So I suggest could we add 2 attr field in the endof "struct iatt {", such like ia_fuse_nlink, ia_fuse_ctime, And in function gf_zero_fill_stat , saved the ia_nlink, ia_ctime to ia_fuse_nlink,ia_fuse_ctime before set its to zero, And restore it to valued nlink and ctime in function gf_fuse_stat2attr, So that kernel could get the correct nlink and ctime. Is it a considerable solution? Any risk? Please share your comments, thanks in advance! Adding csaba for helping with this. Best Regards, George -----Original Message----- From: gluster-devel-boun...@gluster.org [mailto:gluster-devel-bounces@ gluster.org] On Behalf Of Niels de Vos Sent: Wednesday, January 24, 2018 7:43 PM To: Pranith Kumar Karampuri <pkara...@redhat.com> Cc: Lian, George (NSB - CN/Hangzhou) <george.l...@nokia-sbell.com>; Zhou, Cynthia (NSB - CN/Hangzhou) <cynthia.z...@nokia-sbell.com>; Li, Deqian (NSB - CN/Hangzhou) <deqian...@nokia-sbell.com>; Gluster-devel@gluster.org; Sun, Ping (NSB - CN/Hangzhou) <ping....@nokia-sbell.com> Subject: Re: [Gluster-devel] a link issue maybe introduced in a bug fix " Don't let NFS cache stat after writes" On Wed, Jan 24, 2018 at 02:24:06PM +0530, Pranith Kumar Karampuri wrote: > hi, > In the same commit you mentioned earlier, there was this code > earlier: > -/* Returns 1 if the stat seems to be filled with zeroes. */ -int > -nfs_zero_filled_stat (struct iatt *buf) -{ > - if (!buf) > - return 1; > - > - /* Do not use st_dev because it is transformed to store the xlator > id > - * in place of the device number. Do not use st_ino because by > this time > - * we've already mapped the root ino to 1 so it is not guaranteed > to be > - * 0. > - */ > - if ((buf->ia_nlink == 0) && (buf->ia_ctime == 0)) > - return 1; > - > - return 0; > -} > - > - > > I moved this to a common library function that can be used in afr as well. > Why was it there in NFS? +Niels for answering that question. Sorry, I dont know why that was done. It was introduced with the initial gNFS implementation, long before I started to work with Gluster. The only reference I have is this from xlators/nfs/server/src/nfs3-helpers.c:nfs3_stat_to_post_op_attr() 371 /* Some performance translators return zero-filled stats when they 372 * do not have up-to-date attributes. Need to handle this by not 373 * returning these zeroed out attrs. 374 */ This may not be true for the current situation anymore. HTH, Niels > > If I give you a patch which will assert the error condition, would it > be possible for you to figure out the first xlator which is unwinding > the iatt with nlink count as zero but ctime as non-zero? > > On Wed, Jan 24, 2018 at 1:03 PM, Lian, George (NSB - CN/Hangzhou) < > george.l...@nokia-sbell.com> wrote: > > > Hi, Pranith Kumar, > > > > > > > > Can you tell me while need set buf->ia_nlink to “0”in function > > gf_zero_fill_stat(), which API or Application will care it? > > > > If I remove this line and also update corresponding in function > > gf_is_zero_filled_stat, > > > > The issue seems gone, but I can’t confirm will lead to other issues. > > > > > > > > So could you please double check it and give your comments? > > > > > > > > My change is as the below: > > > > > > > > gf_boolean_t > > > > gf_is_zero_filled_stat (struct iatt *buf) > > > > { > > > > if (!buf) > > > > return 1; > > > > > > > > /* Do not use st_dev because it is transformed to store the > > xlator id > > > > * in place of the device number. Do not use st_ino because > > by this time > > > > * we've already mapped the root ino to 1 so it is not > > guaranteed to be > > > > * 0. > > > > */ > > > > // if ((buf->ia_nlink == 0) && (buf->ia_ctime == 0)) > > > > if (buf->ia_ctime == ) > > > > return 1; > > > > > > > > return 0; > > > > } > > > > > > > > void > > > > gf_zero_fill_stat (struct iatt *buf) > > > > { > > > > // buf->ia_nlink = 0; > > > > buf->ia_ctime = 0; > > > > } > > > > > > > > Thanks & Best Regards > > > > George > > > > *From:* Lian, George (NSB - CN/Hangzhou) > > *Sent:* Friday, January 19, 2018 10:03 AM > > *To:* Pranith Kumar Karampuri <pkara...@redhat.com>; Zhou, Cynthia > > (NSB - > > CN/Hangzhou) <cynthia.z...@nokia-sbell.com> > > *Cc:* Li, Deqian (NSB - CN/Hangzhou) <deqian...@nokia-sbell.com>; > > Gluster-devel@gluster.org; Sun, Ping (NSB - CN/Hangzhou) < > > ping....@nokia-sbell.com> > > > > *Subject:* RE: [Gluster-devel] a link issue maybe introduced in a > > bug fix " Don't let NFS cache stat after writes" > > > > > > > > Hi, > > > > >>> Cool, this works for me too. Send me a mail off-list once you > > >>> are > > available and we can figure out a way to get into a call and work on this. > > > > > > > > Have you reproduced the issue per the step I listed in > > https://bugzilla.redhat.com/show_bug.cgi?id=1531457 and last mail? > > > > > > > > If not, I would like you could try it yourself , which the > > difference between yours and mine is just create only 2 bricks instead of 6 bricks. > > > > > > > > And Cynthia could have a session with you if you needed when I am > > not available in next Monday and Tuesday. > > > > > > > > Thanks & Best Regards, > > > > George > > > > > > > > *From:* gluster-devel-boun...@gluster.org > > [mailto:gluster-devel-bounces@ gluster.org > > <gluster-devel-boun...@gluster.org>] *On Behalf Of *Pranith Kumar > > Karampuri > > *Sent:* Thursday, January 18, 2018 6:03 PM > > *To:* Lian, George (NSB - CN/Hangzhou) <george.l...@nokia-sbell.com> > > *Cc:* Zhou, Cynthia (NSB - CN/Hangzhou) > > <cynthia.z...@nokia-sbell.com>; Li, Deqian (NSB - CN/Hangzhou) > > <deqian...@nokia-sbell.com>; Gluster-devel@gluster.org; Sun, Ping > > (NSB - CN/Hangzhou) < ping....@nokia-sbell.com> > > *Subject:* Re: [Gluster-devel] a link issue maybe introduced in a > > bug fix " Don't let NFS cache stat after writes" > > > > > > > > > > > > > > > > On Thu, Jan 18, 2018 at 12:17 PM, Lian, George (NSB - CN/Hangzhou) < > > george.l...@nokia-sbell.com> wrote: > > > > Hi, > > > > >>>I actually tried it with replica-2 and replica-3 and then > > >>>distributed > > replica-2 before replying to the earlier mail. We can have a > > debugging session if you are okay with it. > > > > > > > > It is fine if you can’t reproduce the issue in your ENV. > > > > And I has attached the detail reproduce log in the Bugzilla FYI > > > > > > > > But I am sorry I maybe OOO at Monday and Tuesday next week, so debug > > session will be fine to me at next Wednesday. > > > > > > > > Cool, this works for me too. Send me a mail off-list once you are > > available and we can figure out a way to get into a call and work on this. > > > > > > > > > > > > > > > > Paste the detail reproduce log FYI here: > > > > *root@ubuntu:~# gluster peer probe ubuntu* > > > > *peer probe: success. Probe on localhost not needed* > > > > *root@ubuntu:~# gluster v create test replica 2 ubuntu:/home/gfs/b1 > > ubuntu:/home/gfs/b2 force* > > > > *volume create: test: success: please start the volume to access > > data* > > > > *root@ubuntu:~# gluster v start test* > > > > *volume start: test: success* > > > > *root@ubuntu:~# gluster v info test* > > > > > > > > *Volume Name: test* > > > > *Type: Replicate* > > > > *Volume ID: fef5fca3-81d9-46d3-8847-74cde6f701a5* > > > > *Status: Started* > > > > *Snapshot Count: 0* > > > > *Number of Bricks: 1 x 2 = 2* > > > > *Transport-type: tcp* > > > > *Bricks:* > > > > *Brick1: ubuntu:/home/gfs/b1* > > > > *Brick2: ubuntu:/home/gfs/b2* > > > > *Options Reconfigured:* > > > > *transport.address-family: inet* > > > > *nfs.disable: on* > > > > *performance.client-io-threads: off* > > > > *root@ubuntu:~# gluster v status* > > > > *Status of volume: test* > > > > *Gluster process TCP Port RDMA Port Online > > Pid* > > > > > > *------------------------------------------------------------------- > > -----------* > > > > *Brick ubuntu:/home/gfs/b1 49152 0 Y > > 7798* > > > > *Brick ubuntu:/home/gfs/b2 49153 0 Y > > 7818* > > > > *Self-heal Daemon on localhost N/A N/A Y > > 7839* > > > > > > > > *Task Status of Volume test* > > > > > > *------------------------------------------------------------------- > > -----------* > > > > *There are no active volume tasks* > > > > > > > > > > > > *root@ubuntu:~# gluster v set test cluster.consistent-metadata on* > > > > *volume set: success* > > > > > > > > *root@ubuntu:~# ls /mnt/test* > > > > *ls: cannot access '/mnt/test': No such file or directory* > > > > *root@ubuntu:~# mkdir -p /mnt/test* > > > > *root@ubuntu:~# mount -t glusterfs ubuntu:/test /mnt/test* > > > > > > > > *root@ubuntu:~# cd /mnt/test* > > > > *root@ubuntu:/mnt/test# echo "abc">aaa* > > > > *root@ubuntu:/mnt/test# cp aaa bbb;link bbb ccc* > > > > > > > > *root@ubuntu:/mnt/test# kill -9 7818* > > > > *root@ubuntu:/mnt/test# cp aaa ddd;link ddd eee* > > > > *link: cannot create link 'eee' to 'ddd': No such file or directory* > > > > > > > > > > > > Best Regards, > > > > George > > > > > > > > *From:* gluster-devel-boun...@gluster.org > > [mailto:gluster-devel-bounces@ gluster.org] *On Behalf Of *Pranith > > Kumar Karampuri > > *Sent:* Thursday, January 18, 2018 2:40 PM > > > > > > *To:* Lian, George (NSB - CN/Hangzhou) <george.l...@nokia-sbell.com> > > *Cc:* Zhou, Cynthia (NSB - CN/Hangzhou) > > <cynthia.z...@nokia-sbell.com>; Gluster-devel@gluster.org; Li, > > Deqian (NSB - CN/Hangzhou) < deqian...@nokia-sbell.com>; Sun, Ping > > (NSB - CN/Hangzhou) < ping....@nokia-sbell.com> > > *Subject:* Re: [Gluster-devel] a link issue maybe introduced in a > > bug fix " Don't let NFS cache stat after writes" > > > > > > > > > > > > > > > > On Thu, Jan 18, 2018 at 6:33 AM, Lian, George (NSB - CN/Hangzhou) < > > george.l...@nokia-sbell.com> wrote: > > > > Hi, > > > > I suppose the brick numbers in your testing is six, and you just > > shut down the 3 process. > > > > When I reproduce the issue, I only create a replicate volume with 2 > > bricks, only let ONE brick working and set > > cluster.consistent-metadata on, > > > > With this 2 test condition, the issue could 100% reproducible. > > > > > > > > Hi, > > > > I actually tried it with replica-2 and replica-3 and then > > distributed replica-2 before replying to the earlier mail. We can > > have a debugging session if you are okay with it. > > > > I am in the middle of a customer issue myself(That is the reason for > > this delay :-( ) and thinking of wrapping it up early next week. > > Would that be fine with you? > > > > > > > > > > > > > > > > > > > > 16:44:28 :) ⚡ gluster v status > > > > Status of volume: r2 > > > > Gluster process TCP Port RDMA Port Online > > Pid > > > > ------------------------------------------------------------ > > ------------------ > > > > Brick localhost.localdomain:/home/gfs/r2_0 49152 0 Y > > 5309 > > > > Brick localhost.localdomain:/home/gfs/r2_1 49154 0 Y > > 5330 > > > > Brick localhost.localdomain:/home/gfs/r2_2 49156 0 Y > > 5351 > > > > Brick localhost.localdomain:/home/gfs/r2_3 49158 0 Y > > 5372 > > > > Brick localhost.localdomain:/home/gfs/r2_4 49159 0 Y > > 5393 > > > > Brick localhost.localdomain:/home/gfs/r2_5 49160 0 Y > > 5414 > > > > Self-heal Daemon on localhost N/A N/A Y > > 5436 > > > > > > > > Task Status of Volume r2 > > > > ------------------------------------------------------------ > > ------------------ > > > > There are no active volume tasks > > > > > > > > root@dhcp35-190 - ~ > > > > 16:44:38 :) ⚡ kill -9 5309 5351 5393 > > > > > > > > Best Regards, > > > > George > > > > *From:* gluster-devel-boun...@gluster.org > > [mailto:gluster-devel-bounces@ gluster.org] *On Behalf Of *Pranith > > Kumar Karampuri > > *Sent:* Wednesday, January 17, 2018 7:27 PM > > *To:* Lian, George (NSB - CN/Hangzhou) <george.l...@nokia-sbell.com> > > *Cc:* Li, Deqian (NSB - CN/Hangzhou) <deqian...@nokia-sbell.com>; > > Gluster-devel@gluster.org; Zhou, Cynthia (NSB - CN/Hangzhou) < > > cynthia.z...@nokia-sbell.com>; Sun, Ping (NSB - CN/Hangzhou) < > > ping....@nokia-sbell.com> > > > > > > *Subject:* Re: [Gluster-devel] a link issue maybe introduced in a > > bug fix " Don't let NFS cache stat after writes" > > > > > > > > > > > > > > > > On Mon, Jan 15, 2018 at 1:55 PM, Pranith Kumar Karampuri < > > pkara...@redhat.com> wrote: > > > > > > > > > > > > On Mon, Jan 15, 2018 at 8:46 AM, Lian, George (NSB - CN/Hangzhou) < > > george.l...@nokia-sbell.com> wrote: > > > > Hi, > > > > > > > > Have you reproduced this issue? If yes, could you please confirm > > whether it is an issue or not? > > > > > > > > Hi, > > > > I tried recreating this on my laptop and on both master and > > 3.12 and I am not able to recreate the issue :-(. > > > > Here is the execution log: https://paste.fedoraproject.org/paste/- > > csXUKrwsbrZAVW1KzggQQ > > > > Since I was doing this on my laptop, I changed shutting down of the > > replica to killing the brick process to simulate this test. > > > > Let me know if I missed something. > > > > > > > > > > > > Sorry, I am held up with some issue at work, so I think I will get > > some time day after tomorrow to look at this. In the mean time I am > > adding more people who know about afr to see if they get a chance to > > work on this before me. > > > > > > > > > > > > And if it is an issue, do you have any solution for this issue? > > > > > > > > Thanks & Best Regards, > > > > George > > > > > > > > *From:* Lian, George (NSB - CN/Hangzhou) > > *Sent:* Thursday, January 11, 2018 2:01 PM > > *To:* Pranith Kumar Karampuri <pkara...@redhat.com> > > *Cc:* Zhou, Cynthia (NSB - CN/Hangzhou) > > <cynthia.z...@nokia-sbell.com>; Gluster-devel@gluster.org; Li, > > Deqian (NSB - CN/Hangzhou) < deqian...@nokia-sbell.com>; Sun, Ping > > (NSB - CN/Hangzhou) < ping....@nokia-sbell.com> > > *Subject:* RE: [Gluster-devel] a link issue maybe introduced in a > > bug fix " Don't let NFS cache stat after writes" > > > > > > > > Hi, > > > > > > > > Please see detail test step on https://bugzilla.redhat.com/ > > show_bug.cgi?id=1531457 > > > > > > > > How reproducible: > > > > > > > > > > > > Steps to Reproduce: > > > > 1.create a volume name "test" with replicated > > > > 2.set volume option cluster.consistent-metadata with on: > > > > gluster v set test cluster.consistent-metadata on > > > > 3. mount volume test on client on /mnt/test > > > > 4. create a file aaa size more than 1 byte > > > > echo "1234567890" >/mnt/test/aaa > > > > 5. shutdown a replicat node, let's say sn-1, only let sn-0 worked > > > > 6. cp /mnt/test/aaa /mnt/test/bbb; link /mnt/test/bbb /mnt/test/ccc > > > > > > > > > > > > BRs > > > > George > > > > > > > > *From:* gluster-devel-boun...@gluster.org > > [mailto:gluster-devel-bounces@ gluster.org > > <gluster-devel-boun...@gluster.org>] *On Behalf Of *Pranith Kumar > > Karampuri > > *Sent:* Thursday, January 11, 2018 12:39 PM > > *To:* Lian, George (NSB - CN/Hangzhou) <george.l...@nokia-sbell.com> > > *Cc:* Zhou, Cynthia (NSB - CN/Hangzhou) > > <cynthia.z...@nokia-sbell.com>; Gluster-devel@gluster.org; Li, > > Deqian (NSB - CN/Hangzhou) < deqian...@nokia-sbell.com>; Sun, Ping > > (NSB - CN/Hangzhou) < ping....@nokia-sbell.com> > > *Subject:* Re: [Gluster-devel] a link issue maybe introduced in a > > bug fix " Don't let NFS cache stat after writes" > > > > > > > > > > > > > > > > On Thu, Jan 11, 2018 at 6:35 AM, Lian, George (NSB - CN/Hangzhou) < > > george.l...@nokia-sbell.com> wrote: > > > > Hi, > > > > >>> In which protocol are you seeing this issue? Fuse/NFS/SMB? > > > > It is fuse, within mountpoint by “mount -t glusterfs …“ command. > > > > > > > > Could you let me know the test you did so that I can try to > > re-create and see what exactly is going on? > > > > Configuration of the volume and the steps to re-create the issue you > > are seeing would be helpful in debugging the issue further. > > > > > > > > > > > > Thanks & Best Regards, > > > > George > > > > > > > > *From:* gluster-devel-boun...@gluster.org > > [mailto:gluster-devel-bounces@ gluster.org] *On Behalf Of *Pranith > > Kumar Karampuri > > *Sent:* Wednesday, January 10, 2018 8:08 PM > > *To:* Lian, George (NSB - CN/Hangzhou) <george.l...@nokia-sbell.com> > > *Cc:* Zhou, Cynthia (NSB - CN/Hangzhou) > > <cynthia.z...@nokia-sbell.com>; Zhong, Hua (NSB - CN/Hangzhou) > > <hua.zh...@nokia-sbell.com>; Li, Deqian (NSB - CN/Hangzhou) > > <deqian...@nokia-sbell.com>; Gluster-devel@gluster.org; Sun, Ping > > (NSB - CN/Hangzhou) <ping....@nokia-sbell.com> > > *Subject:* Re: [Gluster-devel] a link issue maybe introduced in a > > bug fix " Don't let NFS cache stat after writes" > > > > > > > > > > > > > > > > On Wed, Jan 10, 2018 at 11:09 AM, Lian, George (NSB - CN/Hangzhou) < > > george.l...@nokia-sbell.com> wrote: > > > > Hi, Pranith Kumar, > > > > > > > > I has create a bug on Bugzilla https://bugzilla.redhat.com/ > > show_bug.cgi?id=1531457 > > > > After my investigation for this link issue, I suppose your changes > > on afr-dir-write.c with issue " Don't let NFS cache stat after > > writes" , your fix is like: > > > > -------------------------------------- > > > > if (afr_txn_nothing_failed (frame, this)) { > > > > /*if it did pre-op, it will do post-op > > changing ctime*/ > > > > if (priv->consistent_metadata && > > > > afr_needs_changelog_update (local)) > > > > afr_zero_fill_stat (local); > > > > local->transaction.unwind (frame, this); > > > > } > > > > In the above fix, it set the ia_nlink to ‘0’ if option > > consistent-metadata is set to “on”. > > > > And hard link a file with which just created will lead to an error, > > and the error is caused in kernel function “vfs_link”: > > > > if (inode->i_nlink == 0 && !(inode->i_state & I_LINKABLE)) > > > > error = -ENOENT; > > > > > > > > could you please have a check and give some comments here? > > > > > > > > When stat is "zero filled", understanding is that the higher layer > > protocol doesn't send stat value to the kernel and a separate lookup > > is sent by the kernel to get the latest stat value. In which > > protocol are you seeing this issue? Fuse/NFS/SMB? > > > > > > > > > > > > Thanks & Best Regards, > > > > George > > > > > > > > > > -- > > > > Pranith > > > > > > > > > > -- > > > > Pranith > > > > > > > > > > -- > > > > Pranith > > > > > > > > > > -- > > > > Pranith > > > > > > > > > > -- > > > > Pranith > > > > > > > > > > -- > > > > Pranith > > > > > > -- > Pranith _______________________________________________ Gluster-devel mailing list Gluster-devel@gluster.org http://lists.gluster.org/mailman/listinfo/gluster-devel
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