[LU-19670] TCU: trusted.unrm xattr not visible due to client-side caching

• Type: Bug
• Resolution: Unresolved
• Priority: Medium
• Severity: 3
• Assignee: Emoly Liu
• Reporter: Emoly Liu

Description

This issue can be reproduced easily by the following test scripts, based on TCU code:

lctl set_param mdd.*.trash_can_enable=1                                         
lctl set_param mdd.*.trash_can_type=plain                                       
                                                                                
mnt=/mnt/lustre                                                                 
mkdir $mnt/d                                                                    
touch $mnt/d/f                                                                  
rm $mnt/d/f                                                                     
                                                                                
ls -la $mnt/.lustre/trash/MDT0000/*/                                            
                                                                                
rm -r $mnt/d                                                                    
getfattr -n trusted.unrm $mnt/.lustre/trash/MDT0000/*/d 

You can see the error in the output, like:

/mnt/lustre/.lustre/trash/MDT0000/0x200000007:0x1:0x0/d: trusted.unrm: No such attribute

This happened because trusted.unrm was cached by the client. When ls accessed the stub directory, it cached the xattr list without trusted.unrm. After "rm -r $mnt/d", the new xattr was set on the server, but the client still used the stale cache.

I will create a patch to fix.