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Implements lock healing for gluster-block fencing use case.
If mandatory lock is enabled:
- Add domain lock/unlock to afr_lk fop.
- Maintain a list of locks to be healed in afr_private_t.
- Add lock to the list if afr_lk(F_SETLK or F_SETLKW) was sucessful.
- Remove it from the list during afr_lk(F_UNLCK).
- On child_down, mark lock as needing heal on that child. If lock is
lost on quorum no. of bricks, remove it from the list and mark fd bad.
- For fds marked as bad, fail the subsequent fd based fops.
- On parent up, traverse the list and heal the locks IFF the client is
the lk owner and has quorum. (shd does not heal any locks).
updates: #613
Change-Id: I03c46ceaea30f5e6236d5ec13f71d843d827f1bc
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
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There is a low level security issue with fencing since one client
can preempt another client's lock.
This patch does not completely eliminate the issue of a client
misbehaving, but certainly it adds a security layer for default use cases
that does not need fencing.
Change-Id: I55cd15f2ed1ae0f2556e3d27a2ef4bc10fdada1c
updates: #466
Signed-off-by: Susant Palai <spalai@redhat.com>
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design reference: https://review.gluster.org/#/c/glusterfs-specs/+/21925/
This patch adds the lock preempt support.
Note: The current model stores lock enforcement information as separate
xattr on disk. There is another effort going in parallel to store this
in stat(x) of the file. This patch is self sufficient to add fencing
support. Based on the availability of the stat(x) support either I will
rebase this patch or we can modify the necessary bits post merging this
patch.
Change-Id: If4a42f3e0afaee1f66cdb0360ad4e0c005b5b017
updates: #466
Signed-off-by: Susant Palai <spalai@redhat.com>
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