[Bugs] [Bug 1531457] New: hard Link file A to B error if A is just created

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1531457

            Bug ID: 1531457
           Summary: hard Link file A to B error if A is just created
           Product: GlusterFS
           Version: 3.12
         Component: fuse
          Severity: urgent
          Assignee: bugs at gluster.org
          Reporter: george.lian at nokia.com
                CC: bugs at gluster.org



Description of problem:


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.create a volume name "test" with replicated 
2.set volume option cluster.consistent-metadata with on:  
  gluster v set test cluster.consistent-metadata on
3. mount volume test on client on /mnt/test
4. create a file aaa size >1
   echo "1234567890" >/mnt/test/aaa
5. shutdown a replicat node, let's say sn-1, only let sn-0 worked
6. cp /mnt/test/aaa /mnt/test/bbb; link /mnt/test/bbb /mnt/test/ccc

Actual results:
# cp /mnt/test/aaa /mnt/test/bbb;link /mnt/test/bbb /mnt/test/ccc
link: cannot create link '/mnt/test/ccc' to '/mnt/test/bbb': No such file or
directory
[root at mn-0:/mnt/test]
# ls -l /mnt/test/bbb
-rw-r--r-- 1 root root 25 Jan  5 09:34 /mnt/test/bbb
[root at mn-0:/mnt/test]
# ls -l /mnt/test/ccc
ls: cannot access '/mnt/test/ccc': No such file or directory



Expected results:
should be no error for link


Additional info:
after investigate on kernel with ftrace, it should be error in kernel in
fuction vfs_link :
    if (inode->i_nlink == 0 && !(inode->i_state & I_LINKABLE))
        error =  -ENOENT;

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