1. 15 Nov, 2009 2 commits
  2. 13 Nov, 2009 2 commits
    • Ryusuke Konishi's avatar
      nilfs2: fix lock order reversal in chcp operation · c1ea985c
      Ryusuke Konishi authored
      Will fix the following lock order reversal lockdep detected:
      
      =======================================================
      [ INFO: possible circular locking dependency detected ]
      2.6.32-rc6 #7
      -------------------------------------------------------
      chcp/30157 is trying to acquire lock:
       (&nilfs->ns_mount_mutex){+.+.+.}, at: [<fed7cfcc>] nilfs_cpfile_change_cpmode+0x46/0x752 [nilfs2]
      
      but task is already holding lock:
       (&nilfs->ns_segctor_sem){++++.+}, at: [<fed7ca32>] nilfs_transaction_begin+0xba/0x110 [nilfs2]
      
      which lock already depends on the new lock.
      
      the existing dependency chain (in reverse order) is:
      
      -> #2 (&nilfs->ns_segctor_sem){++++.+}:
             [<c105799c>] __lock_acquire+0x109c/0x139d
             [<c1057d26>] lock_acquire+0x89/0xa0
             [<c14151e2>] down_read+0x31/0x45
             [<fed6d77b>] nilfs_attach_checkpoint+0x8f/0x16b [nilfs2]
             [<fed6e393>] nilfs_get_sb+0x3e7/0x653 [nilfs2]
             [<c10c0ccb>] vfs_kern_mount+0x8b/0x124
             [<c10c0db2>] do_kern_mount+0x37/0xc3
             [<c10d7517>] do_mount+0x64d/0x69d
             [<c10d75cd>] sys_mount+0x66/0x95
             [<c1002a14>] sysenter_do_call+0x12/0x32
      
      -> #1 (&type->s_umount_key#31/1){+.+.+.}:
             [<c105799c>] __lock_acquire+0x109c/0x139d
             [<c1057d26>] lock_acquire+0x89/0xa0
             [<c104c0f3>] down_write_nested+0x34/0x52
             [<c10c08fe>] sget+0x22e/0x389
             [<fed6e133>] nilfs_get_sb+0x187/0x653 [nilfs2]
             [<c10c0ccb>] vfs_kern_mount+0x8b/0x124
             [<c10c0db2>] do_kern_mount+0x37/0xc3
             [<c10d7517>] do_mount+0x64d/0x69d
             [<c10d75cd>] sys_mount+0x66/0x95
             [<c1002a14>] sysenter_do_call+0x12/0x32
      
      -> #0 (&nilfs->ns_mount_mutex){+.+.+.}:
             [<c1057727>] __lock_acquire+0xe27/0x139d
             [<c1057d26>] lock_acquire+0x89/0xa0
             [<c1414d63>] mutex_lock_nested+0x41/0x23e
             [<fed7cfcc>] nilfs_cpfile_change_cpmode+0x46/0x752 [nilfs2]
             [<fed801b2>] nilfs_ioctl+0x11a/0x7da [nilfs2]
             [<c10cca12>] vfs_ioctl+0x27/0x6e
             [<c10ccf93>] do_vfs_ioctl+0x491/0x4db
             [<c10cd022>] sys_ioctl+0x45/0x5f
             [<c1002a14>] sysenter_do_call+0x12/0x32
      Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
      c1ea985c
    • Linus Torvalds's avatar
      Linux 2.6.32-rc7 · 156171c7
      Linus Torvalds authored
      156171c7
  3. 12 Nov, 2009 35 commits
  4. 11 Nov, 2009 1 commit