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Description of problem:
GFS deadlock due to the following lock sequence:

(vfs) do_truncate {
        down(.... i_sem);
        down_write(.... i_alloc_sem);
        err = notify_change(dentry, &newattrs); -> call gfs_setattr -> glock
        up_write(.... i_alloc_sem);
        up(.... i_sem);
      }

(gfs) do_write_direct {
         glock
         down(.... i_sem)
         __blockdev_direct_IO -> down(.... i_alloc_sem) -> up(.... i_alloc_sem)
         up(.... i_sem)
       }
(gfs) gfs_read {
         glock
         _blockdev_direct_IO -> down(.... i_sem) -> up(.... i_sem)
       }
         



Version-Release number of selected component (if applicable):
2.6.9-22.ELsmp

How reproducible:
Sometimes

Steps to Reproduce:
1. (Running Oracle performance stress test)
2. Havn't tried using simpler test case.
  

Actual Results:  Oracle process hang. 

Additional info:

oracle        D 0000010061fdfe38     0  4588      1          4619  4571 (NOTLB)
Call Trace:<ffffffff803034ff>{wait_for_completion+167} <ffffffff80132e8d>{default_wake_function+0}
           <ffffffffa019c83b>{:gfs:do_write_direct+1523} <ffffffff80132e8d>{default_wake_function+0}
           <ffffffffa01884a5>{:gfs:glock_wait_internal+350} <ffffffffa0188cd2>{:gfs:gfs_glock_nq+961}
           <ffffffffa0188efb>{:gfs:gfs_glock_nq_init+20} <ffffffffa01a09ae>{:gfs:gfs_setattr+75}
           <ffffffff80132ede>{__wake_up_common+67} <ffffffff80190126>{notify_change+340}
           <ffffffff801756ed>{do_truncate+135} <ffffffff801759be>{sys_ftruncate+248}
oracle        D 00000100e69f3270     0  4548      1          4550  4546 (NOTLB)
Call Trace:<ffffffff8030353f>{wait_for_completion+231} <ffffffff8030353f>{wait_for_completion+231}
           <ffffffff80132e8d>{default_wake_function+0} <ffffffff80302637>{__down+147}
           <ffffffff80132e8d>{default_wake_function+0} <ffffffffa01884a5>{:gfs:glock_wait_internal+350}
           <ffffffff80303c13>{__down_failed+53} <ffffffffa019daa7>{:gfs:.text.lock.ops_file+15}
           <ffffffff801313f5>{recalc_task_prio+337} <ffffffff80131483>{activate_task+124}
           <ffffffff80131931>{try_to_wake_up+734} <ffffffffa019bcca>{:gfs:walk_vm+265}
           <ffffffffa019c248>{:gfs:do_write_direct+0} <ffffffffa019ce66>{:gfs:gfs_write+194}
           <ffffffff80177098>{vfs_write+207} <ffffffff80177275>{sys_pwrite64+86}