linux-ext4 - [Bug 217605] New: unttached inode after power cut with orphan file feature enabled

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Date:   Wed, 28 Jun 2023 13:19:02 +0000
From:   bugzilla-daemon@...nel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 217605] New: unttached inode after power cut with orphan file
 feature enabled

https://bugzilla.kernel.org/show_bug.cgi?id=217605

            Bug ID: 217605
           Summary: unttached inode after power cut with orphan file
                    feature enabled
           Product: File System
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: ext4
          Assignee: fs_ext4@...nel-bugs.osdl.org
          Reporter: chengzhihao1@...wei.com
        Regression: No

Running generic/475(filesystem consistent tests after power cut) could
    easily trigger unattached inode error while doing fsck:
      Unattached zero-length inode 39405.  Clear? no

      Unattached inode 39405
      Connect to /lost+found? no

    Above inconsistence is caused by following process:
           P1                       P2
    ext4_create
     inode = ext4_new_inode_start_handle  // itable records nlink=1
     ext4_add_nondir
       err = ext4_add_entry  // ENOSPC
        ext4_append
         ext4_bread
          ext4_getblk
           ext4_map_blocks // returns ENOSPC
       drop_nlink(inode) // won't be updated into disk inode
       ext4_orphan_add(handle, inode)
        ext4_orphan_file_add
     ext4_journal_stop(handle)
                          jbd2_journal_commit_transaction // commit success
                  >> power cut <<
    ext4_fill_super
     ext4_load_and_init_journal   // itable records nlink=1
     ext4_orphan_cleanup
      ext4_process_orphan
       if (inode->i_nlink)        // true, inode won't be deleted

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