Merge PR #55690 into wip-xiubli-testing-20240730.023818-quincy

* refs/pull/55690/head:
	doc: fixing doc/cephfs/fs-volumes
	mgr/vol: don't import IndexException since it's unused
	qa: disable snapshot_clone_no_wait for some tests
	doc: add the reject the clone when threads are not available feature in the document
	qa: add test cases for the support to reject clones feature
	mgr/volumes: support to reject CephFS clones if cloner threads are not available

diff --cc PendingReleaseNotes
index 8b28544822e8b55d2112a2767801462684151f4f,70d51e3d03ebf93cfb0a51b8923c7d6a187577a1..39e2b7091116e84b9b3a05bcb14207b7e131414d
--- 1/PendingReleaseNotes
--- 2/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@@ -161,10 -152,14 +161,18 @@@
  * CephFS: Full support for subvolumes and subvolume groups is now available
    for snap_schedule Manager module.
  
 +* CephFS: Command "ceph mds fail" and "ceph fs fail" now requires a
 +  confirmation flag when some MDSs exhibit health warning MDS_TRIM or
 +  MDS_CACHE_OVERSIZED. This is to prevent accidental MDS failover causing
 +  further delays in recovery.
+ * CephFS: The `subvolume snapshot clone` command now depends on the config option
+   `snapshot_clone_no_wait` which is used to reject the clone operation when
+   all the cloner threads are busy. This config option is enabled by default which means 
+   that if no cloner threads are free, the clone request errors out with EAGAIN.
+   The value of the config option can be fetched by using:
+    `ceph config get mgr mgr/volumes/snapshot_clone_no_wait`
+   and it can be disabled by using:
+    `ceph config set mgr mgr/volumes/snapshot_clone_no_wait false`
  
  >=18.0.0
  

diff --cc doc/cephfs/fs-volumes.rst
Simple merge