[LU-20105] directory entry persists after mv

• Type: Bug
• Resolution: Unresolved
• Priority: Medium
• Affects Version/s: Lustre 2.15.7
• Labels: TC-triage-followup llnl
• Environment: lustre-2.15.7_3.llnl-1.t4.x86_64 ; zfs-2.2.8_6llnl-1.t4.x86_64 ; kernel 4.18.0-553.111.1.1toss.t4.x86_64
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Gian-Carlo Defazio

Description

We have observed an in-use directory entry persists on a node after being moved by another node. The original directory entry persists even after it is no longer in use, including logging out and back into the node. 

 

Example on two nodes, mutt6,mutt7

(mutt6):test_mv_dir$ pwd
/p/lflood/defazio1/test_mv_dir
(mutt6):test_mv_dir$ ls
(mutt6):test_mv_dir$

(mutt7):test_mv_dir$ pwd
/p/lflood/defazio1/test_mv_dir
(mutt7):test_mv_dir$ ls
(mutt7):test_mv_dir$

(mutt6):test_mv_dir$ mkdir -p p0/c0
(mutt6):test_mv_dir$ touch p0/c0/
(mutt6):test_mv_dir$ lfs getdirstripe p0
lmv_stripe_count: 0 lmv_stripe_offset: 0 lmv_hash_type: none
(mutt6):test_mv_dir$ lfs getdirstripe p0/c0
lmv_stripe_count: 0 lmv_stripe_offset: 0 lmv_hash_type: none
(mutt6):test_mv_dir$ tree
.
└── p0
    └── c0
        └── f2 directories, 1 file

(mutt7):test_mv_dir$ tree
.
└── p0
    └── c0
        └── f2 directories, 1 file
(mutt7):test_mv_dir$ cd p0/c0
(mutt7):c0$ ls
f

(mutt6):test_mv_dir$ mv p0/c0 p0/c1
(mutt6):test_mv_dir$ tree
.
└── p0
    └── c1
        └── f2 directories, 1 file
(mutt6):test_mv_dir$ ls p0/c0
ls: cannot access 'p0/c0': No such file or directory

(mutt7):c0$ ls
f
(mutt7):c0$ ls ..
c1
(mutt7):c0$ cd ..
(mutt7):p0$ ls
c1
(mutt7):p0$ ls c0
f
(mutt7):p0$ stat -c "%i" c0 c1
144127150650301722
144127150650301722
(mutt7):p0$ lfs path2fid  c0 c1
c0: [0x2000ae141:0x1d1a:0x0]
c1: [0x2000ae141:0x1d1a:0x0]
(mutt7):p0$ sudo lctl set_param ldlm.namespaces.lflood-MDT0000-mdc-*.lru_size=clear
ldlm.namespaces.lflood-MDT0000-mdc-ff1715b8d1174800.lru_size=clear
(mutt7):p0$ stat -c "%i" c0 c1
stat: cannot statx 'c0': No such file or directory
144127150650301722