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Issue:
Consider a simple situation, where glfs_init() is done, i.e. initial
graph is up. Now perform 2 volume sets that results in 2 client side
graph changes. After this perform some IO, the IO fails with ENOTCON.
The only way to recover this client is i guess another graph switch
or restart.
What actually is happening from code perspective:
Initial graph lets say A, followed by 2 consecutive graph switches
to B and C without any IO those two switches.
- graph_setup (A) as a result of GF_EVENT_CHILD_UP, and
fs->next_subvol = A
- glfs_init() results in fs->active_subvol = A, fs->next_subvol = NULL
- graph_setup (B) as a result of GF_EVENT_CHILD_UP, and
fs->next_subvol = B
- graph_setup (C) as a result of GF_EVENT_CHILD_UP, and
fs->next_subvol = C. It also sees that the previous graph B was never
set as fs->active_subvol, i.e. no IO or anything happened on B, so
can safely send GF_EVENT_PARENT_DOWN (by calling glfs_subvol_done(B)).
This parent down on B, results in child_down(B), which is fine.
But child_down also triggers graph_setup(B).
- graph_setup(B) as a result of GF_EVENT_CHILD_DOWN, and
fs->next_subvol = B, and GF_EVENT_PARENT_DOWN on C as explained
above. This again leads to GF_EVENT_CHILD_DOWN on C.
- graph_setup(C) as a result of GF_EVENT_CHILD_DOWN, and
fs->next_subvol = C, and GF_EVENT_PARENT_DOWN on B as explained
above.
Thus both the graphs B and C are disconnected, and hence the ENOTCON
Solution:
Remove the call to graph_setup() when the event is GF_EVENT_CHILD_DOWN.
It don't see any reason why graph_setup should be called when there is
child_down. Not sure what the original reason was, to have graph_setup
in child_down. git hostory shows the first patch itself had this call.
> Reviewed-on: http://review.gluster.org/14656
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
BUG: 1367294
Change-Id: I9de86555f66cc94a05649ac863b40ed3426ffd4b
Signed-off-by: Poornima G <pgurusid@redhat.com>
Signed-off-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Reviewed-on: http://review.gluster.org/14835
Smoke: Gluster Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Kaushal M <kaushal@redhat.com>
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Issue: http://thread.gmane.org/gmane.comp.file-systems.gluster.devel/10922
The right fix for this is elaborate and intrusive, until it is in place,
this patch provides a temperory fix. This fix is necessary, as without this
libgfapi applications like qemu, samba, NFS ganesha are prone to crashes.
This patch will be reverted completely, once the actual fix gets accepted.
Credits: Rajesh Joseph, Raghavendra Talur, Anoop CS
Back-port of: http://review.gluster.org/#/c/13784/
Change-Id: I8a8a0572bea0eec94ece6aa0d7afcf2f459b4a43
BUG: 1319989
Signed-off-by: Poornima G <pgurusid@redhat.com>
Reviewed-on: http://review.gluster.org/13803
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anoop C S <anoopcs@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
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