Commits
Ilya Dryomov committed f77ef5348d4
libceph: stop allocating a new cipher on every crypto request
commit 7af3ea189a9a13f090de51c97f676215dabc1205 upstream.
This is useless and more importantly not allowed on the writeback path,
because crypto_alloc_skcipher() allocates memory with GFP_KERNEL, which
can recurse back into the filesystem:
kworker/9:3 D ffff92303f318180 0 20732 2 0x00000080
Workqueue: ceph-msgr ceph_con_workfn [libceph]
ffff923035dd4480 ffff923038f8a0c0 0000000000000001 000000009eb27318
ffff92269eb28000 ffff92269eb27338 ffff923036b145ac ffff923035dd4480
00000000ffffffff ffff923036b145b0 ffffffff951eb4e1 ffff923036b145a8
Call Trace:
[<ffffffff951eb4e1>] ? schedule+0x31/0x80
[<ffffffff951eb77a>] ? schedule_preempt_disabled+0xa/0x10
[<ffffffff951ed1f4>] ? __mutex_lock_slowpath+0xb4/0x130
[<ffffffff951ed28b>] ? mutex_lock+0x1b/0x30
[<ffffffffc0a974b3>] ? xfs_reclaim_inodes_ag+0x233/0x2d0 [xfs]
[<ffffffff94d92ba5>] ? move_active_pages_to_lru+0x125/0x270
[<ffffffff94f2b985>] ? radix_tree_gang_lookup_tag+0xc5/0x1c0
[<ffffffff94dad0f3>] ? __list_lru_walk_one.isra.3+0x33/0x120
[<ffffffffc0a98331>] ? xfs_reclaim_inodes_nr+0x31/0x40 [xfs]
[<ffffffff94e05bfe>] ? super_cache_scan+0x17e/0x190
[<ffffffff94d919f3>] ? shrink_slab.part.38+0x1e3/0x3d0
[<ffffffff94d9616a>] ? shrink_node+0x10a/0x320
[<ffffffff94d96474>] ? do_try_to_free_pages+0xf4/0x350
[<ffffffff94d967ba>] ? try_to_free_pages+0xea/0x1b0
[<ffffffff94d863bd>] ? __alloc_pages_nodemask+0x61d/0xe60
[<ffffffff94ddf42d>] ? cache_grow_begin+0x9d/0x560
[<ffffffff94ddfb88>] ? fallback_alloc+0x148/0x1c0
[<ffffffff94ed84e7>] ? __crypto_alloc_tfm+0x37/0x130
[<ffffffff94de09db>] ? __kmalloc+0x1eb/0x580
[<ffffffffc09fe2db>] ? crush_choose_firstn+0x3eb/0x470 [libceph]
[<ffffffff94ed84e7>] ? __crypto_alloc_tfm+0x37/0x130
[<ffffffff94ed9c19>] ? crypto_spawn_tfm+0x39/0x60
[<ffffffffc08b30a3>] ? crypto_cbc_init_tfm+0x23/0x40 [cbc]
[<ffffffff94ed857c>] ? __crypto_alloc_tfm+0xcc/0x130
[<ffffffff94edcc23>] ? crypto_skcipher_init_tfm+0x113/0x180
[<ffffffff94ed7cc3>] ? crypto_create_tfm+0x43/0xb0
[<ffffffff94ed83b0>] ? crypto_larval_lookup+0x150/0x150
[<ffffffff94ed7da2>] ? crypto_alloc_tfm+0x72/0x120
[<ffffffffc0a01dd7>] ? ceph_aes_encrypt2+0x67/0x400 [libceph]
[<ffffffffc09fd264>] ? ceph_pg_to_up_acting_osds+0x84/0x5b0 [libceph]
[<ffffffff950d40a0>] ? release_sock+0x40/0x90
[<ffffffff95139f94>] ? tcp_recvmsg+0x4b4/0xae0
[<ffffffffc0a02714>] ? ceph_encrypt2+0x54/0xc0 [libceph]
[<ffffffffc0a02b4d>] ? ceph_x_encrypt+0x5d/0x90 [libceph]
[<ffffffffc0a02bdf>] ? calcu_signature+0x5f/0x90 [libceph]
[<ffffffffc0a02ef5>] ? ceph_x_sign_message+0x35/0x50 [libceph]
[<ffffffffc09e948c>] ? prepare_write_message_footer+0x5c/0xa0 [libceph]
[<ffffffffc09ecd18>] ? ceph_con_workfn+0x2258/0x2dd0 [libceph]
[<ffffffffc09e9903>] ? queue_con_delay+0x33/0xd0 [libceph]
[<ffffffffc09f68ed>] ? __submit_request+0x20d/0x2f0 [libceph]
[<ffffffffc09f6ef8>] ? ceph_osdc_start_request+0x28/0x30 [libceph]
[<ffffffffc0b52603>] ? rbd_queue_workfn+0x2f3/0x350 [rbd]
[<ffffffff94c94ec0>] ? process_one_work+0x160/0x410
[<ffffffff94c951bd>] ? worker_thread+0x4d/0x480
[<ffffffff94c95170>] ? process_one_work+0x410/0x410
[<ffffffff94c9af8d>] ? kthread+0xcd/0xf0
[<ffffffff951efb2f>] ? ret_from_fork+0x1f/0x40
[<ffffffff94c9aec0>] ? kthread_create_on_node+0x190/0x190
Allocating the cipher along with the key fixes the issue - as long the
key doesn't change, a single cipher context can be used concurrently in
multiple requests.
We still can't take that GFP_KERNEL allocation though. Both
ceph_crypto_key_clone() and ceph_crypto_key_decode() are called from
GFP_NOFS context, so resort to memalloc_noio_{save,restore}() here.
Reported-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>