[GSS](7.2.z) Undertow/XNIO file watch service has a possibility to prune all file change events and miss to invoke FileChangeCallback

1. Create two different file systems. For example, one for JBoss (/mnt/test/jboss) and another for the source directory of JSP (/mnt/test/jsp) 2. Deploy test.war which contains example.jsp: <% out.println( "example.jsp" ); %> 3. Access the example.jsp: curl -v localhost:8080/test/example.jsp 4. Create an updated JSP file under /mnt/test/jsp: <% out.println( "updated example.jsp" ); %> 5. move the updated.jsp as example.jsp under test.war: $ mv /mnt/test/jsp/updated.jsp /mnt/test/jboss/standalone/deployments/test.war/example.jsp 6. Access the updated example.jsp: curl -v localhost:8080/test/example.jsp You will not see the updated JSP content but still see the old JSP content. ------------------- You can reproduce the same issue by creating two directories having different project quota settings in the same one filesystem. 1. mount the filesystem with enabling project quota ("prjquota" option): # mount /dev/mapper/<VG_LV-name> /mnt/test -o prjquota 2. Create "/etc/projects" and "/etc/projid" like the following: – /etc/projects 10:/mnt/test/jsp 20:/mnt/test/jboss – /etc/projid jsppro:10 jbosspro:20 3. Create two project quotas by "xfs_quota" command: # xfs_quota -x -c 'project -s jsppro' /mnt/test # xfs_quota -x -c 'project -s jbosspro' /mnt/test # xfs_quota -x -c 'limit -p bsoft=10m bhard=20m jsppro' /mnt/test # xfs_quota -x -c 'limit -p bsoft=500m bhard=700m jbosspro' /mnt/test 4. Check the created quotas: # xfs_quota -x -c 'report -a -h' Project quota on /mnt/test (/dev/mapper/<VG_LV-name>) Blocks Project ID Used Soft Hard Warn/Grace ---------- --------------------------------- #0 336.0G 0 0 00 [------] jsppro 12K 10M 20M 00 [------] jbosspro 182.9M 500M 700M 00 [------] Then, do the same steps to reproduce. Memo: You can remove quota by the following "xfs_quota" command after the test was done: # xfs_quota -x -c 'limit -p bsoft=0 bhard=0 jsppro' /mnt/test # xfs_quota -x -c 'limit -p bsoft=0 bhard=0 jbosspro' /mnt/test # xfs_quota -x -c 'project -C jsppro' /mnt/test # xfs_quota -x -c 'project -C jbosspro' /mnt/test