[LU-4659] link EA inconsistencies

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.6.0, Lustre 2.5.2
• Affects Version/s: Lustre 2.6.0, Lustre 2.4.2, Lustre 2.5.1
• Labels: mn4
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Henri Doreau (Inactive)

Description

Chained link() and rename() leads to incoherent path/fid mappings.

Here's a simple reproducer:

1. cp /bin/ls test.bin
2. ln test.bin test.bin.lnk
3. cp test.bin.lnk test.bin.new
4. mv test.bin.new test.bin
5. lfs path2fid test.bin
   [0x200000400:0x2:0x0]
6. lfs path2fid test.bin.lnk
   [0x200000400:0x1:0x0]
7. lfs fid2path lustre 0x200000400:0x2:0x0
   test.bin
8. lfs fid2path lustre 0x200000400:0x1:0x0
   test.bin
   test.bin.lnk
9. ls -i *
   144115205255725058 test.bin 144115205255725057 test.bin.lnk

Both inodes have a link count=1.