Linus Torvalds fad70111d5 afs fixes ... -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEqG5UsNXhtOCrfGQP+7dXa6fLC2sFAl+JqvsACgkQ+7dXa6fL C2sQeRAAiW+rGQa46ybOv8qBLgVEiH6OzNUk62fesbhl5rKRgapS2r2SJbau29gv KqBld29lp4o84/THJ6hZ6Al1iwZnO2FW+h53Q47M5TH9AbwZhf/zooRSoGb5AmKJ /FR4+K/zTLk7VCSptTtXlKG81bOKQF+tmi6sLdxx70h2T+Ythm3zdVq8PCZZhhGG hw1IfuNDNbUDGus5WgZfIdVkdFCs5WW5cEhrPgqKR0mXYQklnkwgtov/+RAh/Ewf bZ1JFqap15KJ2AcKgw79NZ01MBJ4KyZckzKwgaTVlIEtCMQMBDhJpbKzdtP767rh xkxdzmDmXOop9RNQ8WrIIt6EjpB0We2qxQVGLsPHdEixmlv5n2BjL/wdWa3u/4QZ ymjv7B8jcFSpXQzVnrmeNYsgHo1oJ7G8q8Xh+CJm9BNBtNUiz1raQfxWpS5TeWT4 dQsr/Z/PMCBCBOb6F08pjF8od67DUCx+x1nkCG4qFCeXiC4ouTNkfMZnxWH9mVKP v5Hca2E0ilR3PI5+tn8o/ZPul5NDTesBnAvAAEBQDT79Ff8kAgEJ3M3ipy38VoKV xFiNpNHwDPp15vzneJ7f7Ir27VauRlhCLEuSUtyYH4pD458K3UQAAQRFZB7bkzMX TQTbmEPUbtrs/mOEMKQN6ew8dwawRpMy01j0KnDl0KBFDtfTLU8= =0anM -----END PGP SIGNATURE----- Merge tag 'afs-fixes-20201016' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs Pull afs updates from David Howells: "A collection of fixes to fix afs_cell struct refcounting, thereby fixing a slew of related syzbot bugs: - Fix the cell tree in the netns to use an rwsem rather than RCU. There seem to be some problems deriving from the use of RCU and a seqlock to walk the rbtree, but it's not entirely clear what since there are several different failures being seen. Changing things to use an rwsem instead makes it more robust. The extra performance derived from using RCU isn't necessary in this case since the only time we're looking up a cell is during mount or when cells are being manually added. - Fix the refcounting by splitting the usage counter into a memory refcount and an active users counter. The usage counter was doing double duty, keeping track of whether a cell is still in use and keeping track of when it needs to be destroyed - but this makes the clean up tricky. Separating these out simplifies the logic. - Fix purging a cell that has an alias. A cell alias pins the cell it's an alias of, but the alias is always later in the list. Trying to purge in a single pass causes rmmod to hang in such a case. - Fix cell removal. If a cell's manager is requeued whilst it's removing itself, the manager will run again and re-remove itself, causing problems in various places. Follow Hillf Danton's suggestion to insert a more terminal state that causes the manager to do nothing post-removal. In additional to the above, two other changes: - Add a tracepoint for the cell refcount and active users count. This helped with debugging the above and may be useful again in future. - Downgrade an assertion to a print when a still-active server is seen during purging. This was happening as a consequence of incomplete cell removal before the servers were cleaned up" * tag 'afs-fixes-20201016' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: afs: Don't assert on unpurgeable server records afs: Add tracing for cell refcount and active user count afs: Fix cell removal afs: Fix cell purging with aliases afs: Fix cell refcounting by splitting the usage counter afs: Fix rapid cell addition/removal by not using RCU on cells tree		2020-10-16 15:22:41 -07:00
..
events	afs fixes	2020-10-16 15:22:41 -07:00
bpf_probe.h	bpf: Reliably preserve btf_trace_xxx types	2020-03-02 16:49:55 -08:00
define_trace.h	tracepoint: Optimize using static_call()	2020-09-01 09:58:06 +02:00
perf.h
syscall.h
trace_events.h	tracing: not necessary to define DEFINE_EVENT_PRINT to be empty again	2020-06-30 14:29:32 -04:00