From 46bcff2bfc5e6a8c638d3a32e4f6f6fa4bd01461 Mon Sep 17 00:00:00 2001 From: Dennis Zhou Date: Wed, 11 Dec 2019 15:20:15 -0800 Subject: [PATCH] btrfs: fix compressed write bio blkcg attribution Bio attribution is handled at bio_set_dev() as once we have a device, we have a corresponding request_queue and then can derive the current css. In special cases, we want to attribute to bio to someone else. This can be done by calling bio_associate_blkg_from_css() or kthread_associate_blkcg() depending on the scenario. Btrfs does this for compressed writeback as they are handled by kworkers, so the latter can be done here. Commit 1a41802701ec ("btrfs: drop bio_set_dev where not needed") removes early bio_set_dev() calls prior to submit_stripe_bio(). This breaks the above assumption that we'll have a request_queue when we are doing association. To fix this, switch to using kthread_associate_blkcg(). Without this, we crash in btrfs/024: [ 3052.093088] BUG: kernel NULL pointer dereference, address: 0000000000000510 [ 3052.107013] #PF: supervisor read access in kernel mode [ 3052.107014] #PF: error_code(0x0000) - not-present page [ 3052.107015] PGD 0 P4D 0 [ 3052.107021] Oops: 0000 [#1] SMP [ 3052.138904] CPU: 42 PID: 201270 Comm: kworker/u161:0 Kdump: loaded Not tainted 5.5.0-rc1-00062-g4852d8ac90a9 #712 [ 3052.138905] Hardware name: Quanta Tioga Pass Single Side 01-0032211004/Tioga Pass Single Side, BIOS F08_3A18 12/20/2018 [ 3052.138912] Workqueue: btrfs-delalloc btrfs_work_helper [ 3052.191375] RIP: 0010:bio_associate_blkg_from_css+0x1e/0x3c0 [ 3052.191379] RSP: 0018:ffffc900210cfc90 EFLAGS: 00010282 [ 3052.191380] RAX: 0000000000000000 RBX: ffff88bfe5573c00 RCX: 0000000000000000 [ 3052.191382] RDX: ffff889db48ec2f0 RSI: ffff88bfe5573c00 RDI: ffff889db48ec2f0 [ 3052.191386] RBP: 0000000000000800 R08: 0000000000203bb0 R09: ffff889db16b2400 [ 3052.293364] R10: 0000000000000000 R11: ffff88a07fffde80 R12: ffff889db48ec2f0 [ 3052.293365] R13: 0000000000001000 R14: ffff889de82bc000 R15: ffff889e2b7bdcc8 [ 3052.293367] FS: 0000000000000000(0000) GS:ffff889ffba00000(0000) knlGS:0000000000000000 [ 3052.293368] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3052.293369] CR2: 0000000000000510 CR3: 0000000002611001 CR4: 00000000007606e0 [ 3052.293370] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 3052.293371] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 3052.293372] PKRU: 55555554 [ 3052.293376] Call Trace: [ 3052.402552] btrfs_submit_compressed_write+0x137/0x390 [ 3052.402558] submit_compressed_extents+0x40f/0x4c0 [ 3052.422401] btrfs_work_helper+0x246/0x5a0 [ 3052.422408] process_one_work+0x200/0x570 [ 3052.438601] ? process_one_work+0x180/0x570 [ 3052.438605] worker_thread+0x4c/0x3e0 [ 3052.438614] kthread+0x103/0x140 [ 3052.460735] ? process_one_work+0x570/0x570 [ 3052.460737] ? kthread_mod_delayed_work+0xc0/0xc0 [ 3052.460744] ret_from_fork+0x24/0x30 Fixes: 1a41802701ec ("btrfs: drop bio_set_dev where not needed") Reported-by: Chris Murphy Signed-off-by: Dennis Zhou Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/compression.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index b08e16b8cebb..43e1660f450f 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -447,7 +447,7 @@ blk_status_t btrfs_submit_compressed_write(struct inode *inode, u64 start, if (blkcg_css) { bio->bi_opf |= REQ_CGROUP_PUNT; - bio_associate_blkg_from_css(bio, blkcg_css); + kthread_associate_blkcg(blkcg_css); } refcount_set(&cb->pending_bios, 1); @@ -491,10 +491,8 @@ blk_status_t btrfs_submit_compressed_write(struct inode *inode, u64 start, bio->bi_opf = REQ_OP_WRITE | write_flags; bio->bi_private = cb; bio->bi_end_io = end_compressed_bio_write; - if (blkcg_css) { + if (blkcg_css) bio->bi_opf |= REQ_CGROUP_PUNT; - bio_associate_blkg_from_css(bio, blkcg_css); - } bio_add_page(bio, page, PAGE_SIZE, 0); } if (bytes_left < PAGE_SIZE) { @@ -521,6 +519,9 @@ blk_status_t btrfs_submit_compressed_write(struct inode *inode, u64 start, bio_endio(bio); } + if (blkcg_css) + kthread_associate_blkcg(NULL); + return 0; }