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rbd: modified logic to check image watchers

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Before RBD map operation, we do check the
watchers on the RBD image. In the case of
RWO volume. cephcsi makes sure only one
client is using the RBD image. If the rbd
image is mirrored, by default mirroring
daemon will add a watcher on the image
and as we are using go-ceph a watcher will
be added as we have opened the image So
we will have two watchers on an image if
mirroring is enabled. This holds when the
rbd mirror daemon is running, In case if
the mirror daemon is not running there will
be only one watcher on the rbd image
(which is placed by go-ceph image open)
we should not block the map operation if
the mirroring daemon is not running as
its Async mirroring. This commit adds a
check to make sure no more than 2 watchers
if the image is mirrored or no more than 1
watcher if it is not mirrored image.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
(cherry picked from commit 52290333e6)
This commit is contained in:
Madhu Rajanna 2021-04-19 16:42:46 +05:30 committed by Madhu Rajanna
parent c0533d1b17
commit 599f3fd8e4
1 changed files with 3 additions and 2 deletions
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5
internal/rbd/rbd_util.go
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@ -439,10 +439,11 @@ func (rv *rbdVolume) isInUse() (bool, error) {
// because we opened the image, there is at least one watcher
defaultWatchers := 1
if rv.Primary {
// a watcher will be added by the rbd mirror daemon if the image is primary
// if rbd mirror daemon is running, a watcher will be added by the rbd
// mirror daemon for mirrored images.
defaultWatchers++
}
return len(watchers) != defaultWatchers, nil
return len(watchers) > defaultWatchers, nil
}
// addRbdManagerTask adds a ceph manager task to execute command