Merge tag '9p-for-4.20' of git://github.com/martinetd/linux

Pull 9p updates from Dominique Martinet:
 "Highlights this time around are the end of Matthew's work to remove
  the custom 9p request cache and use a slab directly for requests, with
  some extra patches on my end to not degrade performance, but it's a
  very good cleanup.

  Tomas and I fixed a few more syzkaller bugs (refcount is the big one),
  and I had a go at the coverity bugs and at some of the bugzilla
  reports we had open for a while.

  I'm a bit disappointed that I couldn't get much reviews for a few of
  my own patches, but the big ones got some and it's all been soaking in
  linux-next for quite a while so I think it should be OK.

  Summary:

   - Finish removing the custom 9p request cache mechanism

   - Embed part of the fcall in the request to have better slab
     performance (msize usually is power of two aligned)

   - syzkaller fixes:
      * add a refcount to 9p requests to avoid use after free
      * a few double free issues

   - A few coverity fixes

   - Some old patches that were in the bugzilla:
      * do not trust pdu content for size header
      * mount option for lock retry interval"

* tag '9p-for-4.20' of git://github.com/martinetd/linux: (21 commits)
  9p/trans_fd: put worker reqs on destroy
  9p/trans_fd: abort p9_read_work if req status changed
  9p: potential NULL dereference
  9p locks: fix glock.client_id leak in do_lock
  9p: p9dirent_read: check network-provided name length
  9p/rdma: remove useless check in cm_event_handler
  9p: acl: fix uninitialized iattr access
  9p locks: add mount option for lock retry interval
  9p: do not trust pdu content for stat item size
  9p: Rename req to rreq in trans_fd
  9p: fix spelling mistake in fall-through annotation
  9p/rdma: do not disconnect on down_interruptible EAGAIN
  9p: Add refcount to p9_req_t
  9p: rename p9_free_req() function
  9p: add a per-client fcall kmem_cache
  9p: embed fcall in req to round down buffer allocs
  9p: Remove p9_idpool
  9p: Use a slab for allocating requests
  9p: clear dangling pointers in p9stat_free
  v9fs_dir_readdir: fix double-free on p9stat_read error
  ...

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