Patch shm against pre2-5

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Hi Alan and Linus,

The attached patch fixes the following problems:

- negative dentries for IPC objects prevent shmat on reused shm ids.
- deadlock in shmctl(IPC_RMID) on the shm semaphore
- give the error of do_unlink to the caller if done directly instead
  of a printk
- reestablish meaning of shm_perm.mode | SHM_DEST so ipcs will report
  destroyed segments correctly.
- the callers of newseg_alloc/shm_alloc did not interpret the return
  code right in some places.

Greetings
          Christoph

• multipart/mixed attachment: patch-shm-pre5

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• Next message: Steve Dodd: "Re: reiserfs and knfsd and NFSv4 and volatile file handles"
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• In reply to: Oleg Drokin: "shm in pre2-5"
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