kernel/git/stable/linux.git/fs/dlm/lowcomms.c, branch linux-5.16.y

fs: dlm: fix build with CONFIG_IPV6 disabled

2022-01-27T11:01:31+00:00

[ Upstream commit 1b9beda83e27a0c2cd75d1cb743c297c7b36c844 ] This patch will surround the AF_INET6 case in sk_error_report() of dlm with a #if IS_ENABLED(CONFIG_IPV6). The field sk->sk_v6_daddr is not defined when CONFIG_IPV6 is disabled. If CONFIG_IPV6 is disabled, the socket creation with AF_INET6 should already fail because a runtime check if AF_INET6 is registered. However if there is the possibility that AF_INET6 is set as sk_family the sk_error_report() callback will print then an invalid family type error. Reported-by: kernel test robot Fixes: 4c3d90570bcc ("fs: dlm: don't call kernel_getpeername() in error_report()") Signed-off-by: Alexander Aring Signed-off-by: David Teigland Signed-off-by: Sasha Levin

fs: dlm: don't call kernel_getpeername() in error_report()

2022-01-27T11:01:30+00:00

[ Upstream commit 4c3d90570bcc2b338f70f61f01110268e281ca3c ] In some cases kernel_getpeername() will held the socket lock which is already held when the socket layer calls error_report() callback. Since commit 9dfc685e0262 ("inet: remove races in inet{6}_getname()") this problem becomes more likely because the socket lock will be held always. You will see something like: bob9-u5 login: [ 562.316860] BUG: spinlock recursion on CPU#7, swapper/7/0 [ 562.318562] lock: 0xffff8f2284720088, .magic: dead4ead, .owner: swapper/7/0, .owner_cpu: 7 [ 562.319522] CPU: 7 PID: 0 Comm: swapper/7 Not tainted 5.15.0+ #135 [ 562.320346] Hardware name: Red Hat KVM/RHEL-AV, BIOS 1.13.0-2.module+el8.3.0+7353+9de0a3cc 04/01/2014 [ 562.321277] Call Trace: [ 562.321529] [ 562.321734] dump_stack_lvl+0x33/0x42 [ 562.322282] do_raw_spin_lock+0x8b/0xc0 [ 562.322674] lock_sock_nested+0x1e/0x50 [ 562.323057] inet_getname+0x39/0x110 [ 562.323425] ? sock_def_readable+0x80/0x80 [ 562.323838] lowcomms_error_report+0x63/0x260 [dlm] [ 562.324338] ? wait_for_completion_interruptible_timeout+0xd2/0x120 [ 562.324949] ? lock_timer_base+0x67/0x80 [ 562.325330] ? do_raw_spin_unlock+0x49/0xc0 [ 562.325735] ? _raw_spin_unlock_irqrestore+0x1e/0x40 [ 562.326218] ? del_timer+0x54/0x80 [ 562.326549] sk_error_report+0x12/0x70 [ 562.326919] tcp_validate_incoming+0x3c8/0x530 [ 562.327347] ? kvm_clock_read+0x14/0x30 [ 562.327718] ? ktime_get+0x3b/0xa0 [ 562.328055] tcp_rcv_established+0x121/0x660 [ 562.328466] tcp_v4_do_rcv+0x132/0x260 [ 562.328835] tcp_v4_rcv+0xcea/0xe20 [ 562.329173] ip_protocol_deliver_rcu+0x35/0x1f0 [ 562.329615] ip_local_deliver_finish+0x54/0x60 [ 562.330050] ip_local_deliver+0xf7/0x110 [ 562.330431] ? inet_rtm_getroute+0x211/0x840 [ 562.330848] ? ip_protocol_deliver_rcu+0x1f0/0x1f0 [ 562.331310] ip_rcv+0xe1/0xf0 [ 562.331603] ? ip_local_deliver+0x110/0x110 [ 562.332011] __netif_receive_skb_core+0x46a/0x1040 [ 562.332476] ? inet_gro_receive+0x263/0x2e0 [ 562.332885] __netif_receive_skb_list_core+0x13b/0x2c0 [ 562.333383] netif_receive_skb_list_internal+0x1c8/0x2f0 [ 562.333896] ? update_load_avg+0x7e/0x5e0 [ 562.334285] gro_normal_list.part.149+0x19/0x40 [ 562.334722] napi_complete_done+0x67/0x160 [ 562.335134] virtnet_poll+0x2ad/0x408 [virtio_net] [ 562.335644] __napi_poll+0x28/0x140 [ 562.336012] net_rx_action+0x23d/0x300 [ 562.336414] __do_softirq+0xf2/0x2ea [ 562.336803] irq_exit_rcu+0xc1/0xf0 [ 562.337173] common_interrupt+0xb9/0xd0 It is and was always forbidden to call kernel_getpeername() in context of error_report(). To get rid of the problem we access the destination address for the peer over the socket structure. While on it we fix to print out the destination port of the inet socket. Fixes: 1a31833d085a ("DLM: Replace nodeid_to_addr with kernel_getpeername") Reported-by: Bob Peterson Signed-off-by: Alexander Aring Signed-off-by: David Teigland Signed-off-by: Sasha Levin

fs: dlm: implement delayed ack handling

2021-08-19T16:33:03+00:00

This patch changes that we don't ack each message. Lowcomms will take care about to send an ack back after a bulk of messages was processed. Currently it's only when the whole receive buffer was processed, there might better positions to send an ack back but only the lowcomms implementation know when there are more data to receive. This patch has also disadvantages that we might retransmit more on errors, however this is a very rare case. Tested with make_panic on gfs2 with three nodes by running: trace-cmd record -p function -l 'dlm_send_ack' sleep 100 and trace-cmd report | wc -l Before patch: - 20548 - 21376 - 21398 After patch: - 18338 - 20679 - 19949 Signed-off-by: Alexander Aring Signed-off-by: David Teigland

fs: dlm: move receive loop into receive handler

2021-07-19T16:56:36+00:00

This patch moves the kernel_recvmsg() loop call into the receive_from_sock() function instead of doing the loop outside the function and abort the loop over it's return value. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

fs: dlm: fix multiple empty writequeue alloc

2021-07-19T16:56:35+00:00

This patch will add a mutex that a connection can allocate a writequeue entry buffer only at a sleepable context at one time. If multiple caller waits at the writequeue spinlock and the spinlock gets release it could be that multiple new writequeue page buffers were allocated instead of allocate one writequeue page buffer and other waiters will use remaining buffer of it. It will only be the case for sleepable context which is the common case. In non-sleepable contexts like retransmission we just don't care about such behaviour. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

fs: dlm: generic connect func

2021-07-19T16:56:34+00:00

This patch adds a generic connect function for TCP and SCTP. If the connect functionality differs from each other additional callbacks in dlm_proto_ops were added. The sockopts callback handling will guarantee that sockets created by connect() will use the same options as sockets created by accept(). Signed-off-by: Alexander Aring Signed-off-by: David Teigland

fs: dlm: auto load sctp module

2021-07-19T16:56:26+00:00

This patch adds a "for now" better handling of missing SCTP support in the kernel and try to load the sctp module if SCTP is set. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

fs: dlm: introduce generic listen

2021-07-19T16:53:43+00:00

This patch combines each transport layer listen functionality into one listen function. Per transport layer differences are provided by additional callbacks in dlm_proto_ops. This patch drops silently sock_set_keepalive() for listen tcp sockets only. This socket option is not set at connecting sockets, I also don't see the sense of set keepalive for sockets which are created by accept() only. Signed-off-by: Alexander Aring Signed-off-by: David Teigland

fs: dlm: move to static proto ops

2021-07-19T16:53:43+00:00

This patch moves the per transport socket callbacks to a static const array. We can support only one transport socket for the init namespace which will be determinted by reading the dlm config at lowcomms_start(). Signed-off-by: Alexander Aring Signed-off-by: David Teigland

fs: dlm: introduce con_next_wq helper

2021-07-19T16:53:43+00:00

This patch introduce a function to determine if something is ready to being send in the writequeue. It's not just that the writequeue is not empty additional the first entry need to have a valid length field. Signed-off-by: Alexander Aring Signed-off-by: David Teigland