glusterfs.git/xlators/cluster, branch v7.4 cluster/ec: Change handling of heal failure to avoid crash 2020-03-17T14:27:36+00:00 Ashish Pandey aspandey@redhat.com 2019-07-11T11:22:49+00:00 5b9e4bbeb115d39e1a5e929b4ffbe981e4597ae7 Problem: ec_getxattr_heal_cbk was called with NULL as second argument in case heal was failing. This function was dereferencing "cookie" argument which caused crash. Solution: Cookie is changed to carry the value that was supposed to be stored in fop->data, so even in the case when fop is NULL in error case, there won't be any NULL dereference. Thanks to Xavi for the suggestion about the fix. Change-Id: I0798000d5cadb17c3c2fbfa1baf77033ffc2bb8c updates: #1061 
Problem:
ec_getxattr_heal_cbk was called with NULL as second argument
in case heal was failing.
This function was dereferencing "cookie" argument which caused crash.

Solution:
Cookie is changed to carry the value that was supposed to be
stored in fop->data, so even in the case when fop is NULL in error
case, there won't be any NULL dereference.

Thanks to Xavi for the suggestion about the fix.

Change-Id: I0798000d5cadb17c3c2fbfa1baf77033ffc2bb8c
updates: #1061
cluster/afr: fix race when bricks come up 2020-03-16T08:18:51+00:00 Xavi Hernandez xhernandez@redhat.com 2020-03-01T18:49:04+00:00 87f1163e83339b2c2923106e0d9a45e8a327bb7a The was a problem when self-heal was sending lookups at the same time that one of the bricks was coming up. In this case there was a chance that the number of 'up' bricks changes in the middle of sending the requests to subvolumes which caused a discrepancy in the expected number of replies and the actual number of sent requests. This discrepancy caused that AFR continued executing requests before all requests were complete. Eventually, the frame of the pending request was destroyed when the operation terminated, causing a use- after-free issue when the answer was finally received. In theory the same thing could happen in the reverse way, i.e. AFR tries to wait for more replies than sent requests, causing a hang. Backport of: > Change-Id: I7ed6108554ca379d532efb1a29b2de8085410b70 > Signed-off-by: Xavi Hernandez <xhernandez@redhat.com> > Fixes: bz#1808875 Change-Id: I7ed6108554ca379d532efb1a29b2de8085410b70 Signed-off-by: Xavi Hernandez <xhernandez@redhat.com> Fixes: bz#1809438 
The was a problem when self-heal was sending lookups at the same time
that one of the bricks was coming up. In this case there was a chance
that the number of 'up' bricks changes in the middle of sending the
requests to subvolumes which caused a discrepancy in the expected
number of replies and the actual number of sent requests.

This discrepancy caused that AFR continued executing requests before
all requests were complete. Eventually, the frame of the pending
request was destroyed when the operation terminated, causing a use-
after-free issue when the answer was finally received.

In theory the same thing could happen in the reverse way, i.e. AFR
tries to wait for more replies than sent requests, causing a hang.

Backport of:
> Change-Id: I7ed6108554ca379d532efb1a29b2de8085410b70
> Signed-off-by: Xavi Hernandez <xhernandez@redhat.com>
> Fixes: bz#1808875

Change-Id: I7ed6108554ca379d532efb1a29b2de8085410b70
Signed-off-by: Xavi Hernandez <xhernandez@redhat.com>
Fixes: bz#1809438
cluster/ec: skip updating ctx->loc again when ec_fix_open/opendir 2020-03-16T08:01:00+00:00 Kinglong Mee kinglongmee@gmail.com 2019-07-11T10:57:13+00:00 36e26424f5eabe1332a49c4ffaa3214d38675e29 The ec_manager_open/opendir memsets ctx->loc which causes memory/inode leak, and ec_fheal uses ctx->loc out of fd->lock that loc_copy may copy bad data when memset it. This patch skips updating ctx->loc when it is initilizaed. With it, ctx->loc is filled once, and never updated. Change-Id: I3bf5ffce4caf4c1c667f7acaa14b451d37a3550a fixes: bz#1806843 Signed-off-by: Kinglong Mee <mijinlong@horiscale.com> 
The ec_manager_open/opendir memsets ctx->loc which causes
memory/inode leak, and ec_fheal uses ctx->loc out of fd->lock
that loc_copy may copy bad data when memset it.

This patch skips updating ctx->loc when it is initilizaed.
With it, ctx->loc is filled once, and never updated.

Change-Id: I3bf5ffce4caf4c1c667f7acaa14b451d37a3550a
fixes: bz#1806843
Signed-off-by: Kinglong Mee <mijinlong@horiscale.com>
afr: prevent spurious entry heals leading to gfid split-brain 2020-02-25T17:07:04+00:00 Ravishankar N ravishankar@redhat.com 2020-02-11T09:04:48+00:00 2c5b724c0071ae184dd4bfd441d7346106387ed5 Problem: In a hyperconverged setup with granular-entry-heal enabled, if a file is recreated while one of the bricks is down, and an index heal is triggered (with the brick still down), entry-self heal was doing a spurious heal with just the 2 good bricks. It was doing a post-op leading to removal of the filename from .glusterfs/indices/entry-changes as well as erroneous setting of afr xattrs on the parent. When the brick came up, the xattrs were cleared, resulting in the renamed file not getting healed and leading to gfid split-brain and EIO on the mount. Fix: Proceed with entry heal only when shd can connect to all bricks of the replica, just like in data and metadata heal. fixes: bz#1804591 Change-Id: I916ae26ad1fabf259bc6362da52d433b7223b17e Signed-off-by: Ravishankar N <ravishankar@redhat.com> (cherry picked from commit 06453d77d056fbaa393a137ca277a20e38d2f67e) 
Problem:
In a hyperconverged setup with granular-entry-heal enabled, if a file is
recreated while one of the bricks is down, and an index heal is triggered
(with the brick still down), entry-self heal was doing a spurious heal
with just the 2 good bricks. It was doing a post-op leading to removal
of the filename from .glusterfs/indices/entry-changes as well as
erroneous setting of afr xattrs on the parent. When the brick came up,
the xattrs were cleared, resulting in the renamed file not getting
healed and leading to gfid split-brain and EIO on the mount.

Fix:
Proceed with entry heal only when shd can connect to all bricks of the replica,
just like in data and metadata heal.

fixes: bz#1804591
Change-Id: I916ae26ad1fabf259bc6362da52d433b7223b17e
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
(cherry picked from commit 06453d77d056fbaa393a137ca277a20e38d2f67e)
cluster/thin-arbiter: Wait for TA connection before ta-file lookup 2020-02-18T06:49:31+00:00 Ashish Pandey aspandey@redhat.com 2020-01-03T11:24:33+00:00 fc0f7442f038ce86344dd6b735abcff6a50533b8 Problem: When we mount a ta volume, as soon as 2 data bricks are connected we consider that the mount is done and then send a lookup/create on ta file on ta node. However, this connection with ta node might not have been completed. Due to this delay, ta replica id file will not be created and we will see ENOTCONN error in log file if we do lookup. Solution: As we know that this ta node could have a higher latency, we should wait for reasonable time for connection to happen before sending lookup/create on replica id file. fixes: bz#1804058 Change-Id: I36f90865afe617e4e84cee57fec832a16f5dd6cc (cherry picked from commit a7fa54ddea3fe429f143b37e4de06a93b49d776a) 
Problem:
When we mount a ta volume, as soon as 2 data bricks are connected
we consider that the mount is done and then send a lookup/create on
ta file on ta node. However, this connection with ta node might not
have been completed.
Due to this delay, ta replica id file will not be created and we
will see ENOTCONN error in log file if we do lookup.

Solution:
As we know that this ta node could have a higher latency, we should
wait for reasonable time for connection to happen before sending
lookup/create on replica id file.

fixes: bz#1804058
Change-Id: I36f90865afe617e4e84cee57fec832a16f5dd6cc
(cherry picked from commit a7fa54ddea3fe429f143b37e4de06a93b49d776a)
tests: Fix spurious self-heald.t failure 2020-02-13T07:12:46+00:00 Pranith Kumar K pkarampu@redhat.com 2020-02-11T10:12:05+00:00 965503fc2d32d562c7956d4935f9c00768ed4e13 Problem: heal-info code assumes that all indices in xattrop directory definitely need heal. There is one corner case. The very first xattrop on the file will lead to adding the gfid to 'xattrop' index in fop path and in _cbk path it is removed because the fop is zero-xattr xattrop in success case. These gfids could be read by heal-info and shown as needing heal. Fix: Check the pending flag to see if the file definitely needs or not instead of which index is being crawled at the moment. fixes: bz#1802449 Change-Id: I79f00dc7366fedbbb25ec4bec838dba3b34c7ad5 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> (cherry picked from commit d27df94016b5526c18ee964d4a47508326329dda) 
Problem:
heal-info code assumes that all indices in xattrop directory
definitely need heal. There is one corner case.
The very first xattrop on the file will lead to adding the
gfid to 'xattrop' index in fop path and in _cbk path it is
removed because the fop is zero-xattr xattrop in success case.
These gfids could be read by heal-info and shown as needing heal.

Fix:
Check the pending flag to see if the file definitely needs or
not instead of which index is being crawled at the moment.

fixes: bz#1802449
Change-Id: I79f00dc7366fedbbb25ec4bec838dba3b34c7ad5
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
(cherry picked from commit d27df94016b5526c18ee964d4a47508326329dda)
afr: expose cluster.optimistic-change-log to CLI. 2020-01-09T13:22:22+00:00 Ravishankar N ravishankar@redhat.com 2020-01-08T05:41:53+00:00 dc2c94c6df87cb3e97adfff080123db883f7a591 Backport of https://review.gluster.org/#/c/glusterfs/+/23960/ This volume option was not made avaialble to `gluster volume set` CLI. Reported-by: epolakis(https://github.com/kinsu) in https://github.com/gluster/glusterfs/issues/781 fixes: bz#1788785 Change-Id: I7141bdd4e53ee99e22b354edde8d023bfc0b2cd7 Signed-off-by: Ravishankar N <ravishankar@redhat.com> 
Backport of https://review.gluster.org/#/c/glusterfs/+/23960/

This volume option was not made avaialble to `gluster volume set` CLI.

Reported-by: epolakis(https://github.com/kinsu) in
https://github.com/gluster/glusterfs/issues/781

fixes: bz#1788785
Change-Id: I7141bdd4e53ee99e22b354edde8d023bfc0b2cd7
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
afr: make heal info lockless 2019-12-16T05:38:25+00:00 Ravishankar N ravishankar@redhat.com 2019-11-07T09:48:30+00:00 ac108947b0f25293c154707b70ea01eb3774f542 Changes in locks xlator: Added support for per-domain inodelk count requests. Caller needs to set GLUSTERFS_MULTIPLE_DOM_LK_CNT_REQUESTS key in the dict and then set each key with name 'GLUSTERFS_INODELK_DOM_PREFIX:<domain name>'. In the response dict, the xlator will send the per domain count as values for each of these keys. Changes in AFR: Replaced afr_selfheal_locked_inspect() with afr_lockless_inspect(). Logic has been added to make the latter behave same as the former, thus not breaking the current heal info output behaviour. fixes: bz#1783858 Change-Id: Ie9e83c162aa77f44a39c2ba7115de558120ada4d Signed-off-by: Ravishankar N <ravishankar@redhat.com> (cherry picked from commit d7e049160a9dea988ded5816491c2234d40ab6b3) 
Changes in locks xlator:
Added support for per-domain inodelk count requests.
Caller needs to set GLUSTERFS_MULTIPLE_DOM_LK_CNT_REQUESTS key in the
dict and then set each key with name
'GLUSTERFS_INODELK_DOM_PREFIX:<domain name>'.
In the response dict, the xlator will send the per domain count as
values for each of these keys.

Changes in AFR:
Replaced afr_selfheal_locked_inspect() with afr_lockless_inspect(). Logic has
been added to make the latter behave same as the former, thus not
breaking the current heal info output behaviour.

fixes: bz#1783858
Change-Id: Ie9e83c162aa77f44a39c2ba7115de558120ada4d
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
(cherry picked from commit d7e049160a9dea988ded5816491c2234d40ab6b3)
cluster/dht: Correct fd processing loop 2019-11-26T06:46:32+00:00 N Balachandran nbalacha@redhat.com 2019-11-07T03:25:41+00:00 0520a943c3a5192d2cc92540ddeaf641093ff6af The fd processing loops in the dht_migration_complete_check_task and the dht_rebalance_inprogress_task functions were unsafe and could cause an open to be sent on an already freed fd. This has been fixed. Change-Id: I0a3c7d2fba314089e03dfd704f9dceb134749540 fixes: bz#1769315 Signed-off-by: N Balachandran <nbalacha@redhat.com> 
The fd processing loops in the
dht_migration_complete_check_task and the
dht_rebalance_inprogress_task functions were unsafe
and could cause an open to be sent on an already freed
fd. This has been fixed.

Change-Id: I0a3c7d2fba314089e03dfd704f9dceb134749540
fixes: bz#1769315
Signed-off-by: N Balachandran <nbalacha@redhat.com>
cluster/afr: Heal entries when there is a source & no healed_sinks 2019-11-14T13:18:45+00:00 karthik-us ksubrahm@redhat.com 2019-09-05T10:44:50+00:00 7f58624cbf88e235dc44714c5f5b00cffcab6b59 Problem: In a situation where B1 blames B2, B2 blames B1 and B3 doesn't blame anything for entry heal, heal will not complete even though we have clear source and sinks. This will happen because while doing afr_selfheal_find_direction() only the bricks which are blamed by non-accused bricks are considered as sinks. Later in __afr_selfheal_entry_finalize_source() when it tries to mark all the non-sources as sinks it fails to do so because there won't be any healed_sinks marked, no witness present and there will be a source. Fix: If there is a source and no healed_sinks, then reset all the locked sources to 0 and healed sinks to 1 to do conservative merge. Change-Id: If40d8bc95d52a52b2730f55bdcf135109b421548 Fixes: bz#1760699 Signed-off-by: karthik-us <ksubrahm@redhat.com> 
Problem:
In a situation where B1 blames B2, B2 blames B1 and B3 doesn't blame
anything for entry heal, heal will not complete even though we have
clear source and sinks. This will happen because while doing
afr_selfheal_find_direction() only the bricks which are blamed by
non-accused bricks are considered as sinks. Later in
__afr_selfheal_entry_finalize_source() when it tries to mark all the
non-sources as sinks it fails to do so because there won't be any
healed_sinks marked, no witness present and there will be a source.

Fix:
If there is a source and no healed_sinks, then reset all the locked
sources to 0 and healed sinks to 1 to do conservative merge.

Change-Id: If40d8bc95d52a52b2730f55bdcf135109b421548
Fixes: bz#1760699
Signed-off-by: karthik-us <ksubrahm@redhat.com>