From: Xiubo Li <xiubli@xxxxxxxxxx> When unmounting all the dirty buffers will be flushed and after the last osd request is finished the last reference of the i_count will be released. Then it will flush the dirty cap/snap to MDSs, and the unmounting won't wait the possible acks, which will ihold the inodes when updating the metadata locally but makes no sense any more, of this. This will make the evict_inodes() to skip these inodes. If encrypt is enabled the kernel generate a warning when removing the encrypt keys when the skipped inodes still hold the keyring: WARNING: CPU: 4 PID: 168846 at fs/crypto/keyring.c:242 fscrypt_destroy_keyring+0x7e/0xd0 CPU: 4 PID: 168846 Comm: umount Tainted: G S 6.1.0-rc5-ceph-g72ead199864c #1 Hardware name: Supermicro SYS-5018R-WR/X10SRW-F, BIOS 2.0 12/17/2015 RIP: 0010:fscrypt_destroy_keyring+0x7e/0xd0 RSP: 0018:ffffc9000b277e28 EFLAGS: 00010202 RAX: 0000000000000002 RBX: ffff88810d52ac00 RCX: ffff88810b56aa00 RDX: 0000000080000000 RSI: ffffffff822f3a09 RDI: ffff888108f59000 RBP: ffff8881d394fb88 R08: 0000000000000028 R09: 0000000000000000 R10: 0000000000000001 R11: 11ff4fe6834fcd91 R12: ffff8881d394fc40 R13: ffff888108f59000 R14: ffff8881d394f800 R15: 0000000000000000 FS: 00007fd83f6f1080(0000) GS:ffff88885fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f918d417000 CR3: 000000017f89a005 CR4: 00000000003706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> generic_shutdown_super+0x47/0x120 kill_anon_super+0x14/0x30 ceph_kill_sb+0x36/0x90 [ceph] deactivate_locked_super+0x29/0x60 cleanup_mnt+0xb8/0x140 task_work_run+0x67/0xb0 exit_to_user_mode_prepare+0x23d/0x240 syscall_exit_to_user_mode+0x25/0x60 do_syscall_64+0x40/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fd83dc39e9b Later the kernel will crash when iput() the inodes and dereferencing the "sb->s_master_keys", which has been released by the generic_shutdown_super(). URL: https://tracker.ceph.com/issues/58126 URL: https://tracker.ceph.com/issues/59162 Reviewed-by: Milind Changire <mchangir@xxxxxxxxxx> Tested-by: Luís Henriques <lhenriques@xxxxxxx> Reviewed-by: Luís Henriques <lhenriques@xxxxxxx> Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx> --- fs/ceph/caps.c | 6 +++- fs/ceph/mds_client.c | 14 ++++++-- fs/ceph/mds_client.h | 11 ++++++- fs/ceph/quota.c | 14 ++++---- fs/ceph/snap.c | 10 +++--- fs/ceph/super.c | 76 +++++++++++++++++++++++++++++++++++++++++++- fs/ceph/super.h | 3 ++ 7 files changed, 117 insertions(+), 17 deletions(-) diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index f9f2e734d4d6..03a29dc300ae 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -4228,6 +4228,9 @@ void ceph_handle_caps(struct ceph_mds_session *session, dout("handle_caps from mds%d\n", session->s_mds); + if (!ceph_inc_mds_stopping_blocker(mdsc, session)) + return; + /* decode */ end = msg->front.iov_base + msg->front.iov_len; if (msg->front.iov_len < sizeof(*h)) @@ -4329,7 +4332,6 @@ void ceph_handle_caps(struct ceph_mds_session *session, vino.snap, inode); mutex_lock(&session->s_mutex); - inc_session_sequence(session); dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq, (unsigned)seq); @@ -4441,6 +4443,8 @@ void ceph_handle_caps(struct ceph_mds_session *session, done_unlocked: iput(inode); out: + ceph_dec_mds_stopping_blocker(mdsc); + ceph_put_string(extra_info.pool_ns); /* Defer closing the sessions after s_mutex lock being released */ diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index cd7b25f6b908..679f433a60a8 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -4902,6 +4902,9 @@ static void handle_lease(struct ceph_mds_client *mdsc, dout("handle_lease from mds%d\n", mds); + if (!ceph_inc_mds_stopping_blocker(mdsc, session)) + return; + /* decode */ if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) goto bad; @@ -4920,8 +4923,6 @@ static void handle_lease(struct ceph_mds_client *mdsc, dname.len, dname.name); mutex_lock(&session->s_mutex); - inc_session_sequence(session); - if (!inode) { dout("handle_lease no inode %llx\n", vino.ino); goto release; @@ -4983,9 +4984,13 @@ static void handle_lease(struct ceph_mds_client *mdsc, out: mutex_unlock(&session->s_mutex); iput(inode); + + ceph_dec_mds_stopping_blocker(mdsc); return; bad: + ceph_dec_mds_stopping_blocker(mdsc); + pr_err("corrupt lease message\n"); ceph_msg_dump(msg); } @@ -5181,6 +5186,9 @@ int ceph_mdsc_init(struct ceph_fs_client *fsc) } init_completion(&mdsc->safe_umount_waiters); + spin_lock_init(&mdsc->stopping_lock); + atomic_set(&mdsc->stopping_blockers, 0); + init_completion(&mdsc->stopping_waiter); init_waitqueue_head(&mdsc->session_close_wq); INIT_LIST_HEAD(&mdsc->waiting_for_map); mdsc->quotarealms_inodes = RB_ROOT; @@ -5295,7 +5303,7 @@ void send_flush_mdlog(struct ceph_mds_session *s) void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) { dout("pre_umount\n"); - mdsc->stopping = 1; + mdsc->stopping = CEPH_MDSC_STOPPING_BEGIN; ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true); ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false); diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index 82165f09a516..351d92f7fc4f 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -398,6 +398,11 @@ struct cap_wait { int want; }; +enum { + CEPH_MDSC_STOPPING_BEGIN = 1, + CEPH_MDSC_STOPPING_FLUSHED = 2, +}; + /* * mds client state */ @@ -414,7 +419,11 @@ struct ceph_mds_client { struct ceph_mds_session **sessions; /* NULL for mds if no session */ atomic_t num_sessions; int max_sessions; /* len of sessions array */ - int stopping; /* true if shutting down */ + + spinlock_t stopping_lock; /* protect snap_empty */ + int stopping; /* the stage of shutting down */ + atomic_t stopping_blockers; + struct completion stopping_waiter; atomic64_t quotarealms_count; /* # realms with quota */ /* diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c index 64592adfe48f..f7fcf7f08ec6 100644 --- a/fs/ceph/quota.c +++ b/fs/ceph/quota.c @@ -47,25 +47,23 @@ void ceph_handle_quota(struct ceph_mds_client *mdsc, struct inode *inode; struct ceph_inode_info *ci; + if (!ceph_inc_mds_stopping_blocker(mdsc, session)) + return; + if (msg->front.iov_len < sizeof(*h)) { pr_err("%s corrupt message mds%d len %d\n", __func__, session->s_mds, (int)msg->front.iov_len); ceph_msg_dump(msg); - return; + goto out; } - /* increment msg sequence number */ - mutex_lock(&session->s_mutex); - inc_session_sequence(session); - mutex_unlock(&session->s_mutex); - /* lookup inode */ vino.ino = le64_to_cpu(h->ino); vino.snap = CEPH_NOSNAP; inode = ceph_find_inode(sb, vino); if (!inode) { pr_warn("Failed to find inode %llu\n", vino.ino); - return; + goto out; } ci = ceph_inode(inode); @@ -78,6 +76,8 @@ void ceph_handle_quota(struct ceph_mds_client *mdsc, spin_unlock(&ci->i_ceph_lock); iput(inode); +out: + ceph_dec_mds_stopping_blocker(mdsc); } static struct ceph_quotarealm_inode * diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c index 986c80ad2853..7e0dc7a96ddd 100644 --- a/fs/ceph/snap.c +++ b/fs/ceph/snap.c @@ -1013,6 +1013,9 @@ void ceph_handle_snap(struct ceph_mds_client *mdsc, int locked_rwsem = 0; bool close_sessions = false; + if (!ceph_inc_mds_stopping_blocker(mdsc, session)) + return; + /* decode */ if (msg->front.iov_len < sizeof(*h)) goto bad; @@ -1028,10 +1031,6 @@ void ceph_handle_snap(struct ceph_mds_client *mdsc, dout("%s from mds%d op %s split %llx tracelen %d\n", __func__, mds, ceph_snap_op_name(op), split, trace_len); - mutex_lock(&session->s_mutex); - inc_session_sequence(session); - mutex_unlock(&session->s_mutex); - down_write(&mdsc->snap_rwsem); locked_rwsem = 1; @@ -1149,6 +1148,7 @@ void ceph_handle_snap(struct ceph_mds_client *mdsc, up_write(&mdsc->snap_rwsem); flush_snaps(mdsc); + ceph_dec_mds_stopping_blocker(mdsc); return; bad: @@ -1158,6 +1158,8 @@ void ceph_handle_snap(struct ceph_mds_client *mdsc, if (locked_rwsem) up_write(&mdsc->snap_rwsem); + ceph_dec_mds_stopping_blocker(mdsc); + if (close_sessions) ceph_mdsc_close_sessions(mdsc); return; diff --git a/fs/ceph/super.c b/fs/ceph/super.c index b9dd2fa36d8b..48da49e21466 100644 --- a/fs/ceph/super.c +++ b/fs/ceph/super.c @@ -1461,15 +1461,89 @@ static int ceph_init_fs_context(struct fs_context *fc) return -ENOMEM; } +/* + * Return true if it successfully increases the blocker counter, + * or false if the mdsc is in stopping and flushed state. + */ +static bool __inc_stopping_blocker(struct ceph_mds_client *mdsc) +{ + spin_lock(&mdsc->stopping_lock); + if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHED) { + spin_unlock(&mdsc->stopping_lock); + return false; + } + atomic_inc(&mdsc->stopping_blockers); + spin_unlock(&mdsc->stopping_lock); + return true; +} + +static void __dec_stopping_blocker(struct ceph_mds_client *mdsc) +{ + spin_lock(&mdsc->stopping_lock); + if (!atomic_dec_return(&mdsc->stopping_blockers) && + mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHED) + complete_all(&mdsc->stopping_waiter); + spin_unlock(&mdsc->stopping_lock); +} + +/* For metadata IO requests */ +bool ceph_inc_mds_stopping_blocker(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session) +{ + mutex_lock(&session->s_mutex); + inc_session_sequence(session); + mutex_unlock(&session->s_mutex); + + return __inc_stopping_blocker(mdsc); +} + +void ceph_dec_mds_stopping_blocker(struct ceph_mds_client *mdsc) +{ + __dec_stopping_blocker(mdsc); +} + static void ceph_kill_sb(struct super_block *s) { struct ceph_fs_client *fsc = ceph_sb_to_client(s); + struct ceph_mds_client *mdsc = fsc->mdsc; + bool wait; dout("kill_sb %p\n", s); - ceph_mdsc_pre_umount(fsc->mdsc); + ceph_mdsc_pre_umount(mdsc); flush_fs_workqueues(fsc); + /* + * Though the kill_anon_super() will finally trigger the + * sync_filesystem() anyway, we still need to do it here and + * then bump the stage of shutdown. This will allow us to + * drop any further message, which will increase the inodes' + * i_count reference counters but makes no sense any more, + * from MDSs. + * + * Without this when evicting the inodes it may fail in the + * kill_anon_super(), which will trigger a warning when + * destroying the fscrypt keyring and then possibly trigger + * a further crash in ceph module when the iput() tries to + * evict the inodes later. + */ + sync_filesystem(s); + + spin_lock(&mdsc->stopping_lock); + mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHED; + wait = !!atomic_read(&mdsc->stopping_blockers); + spin_unlock(&mdsc->stopping_lock); + + if (wait && atomic_read(&mdsc->stopping_blockers)) { + long timeleft = wait_for_completion_killable_timeout( + &mdsc->stopping_waiter, + fsc->client->options->mount_timeout); + if (!timeleft) /* timed out */ + pr_warn("umount timed out, %ld\n", timeleft); + else if (timeleft < 0) /* killed */ + pr_warn("umount was killed, %ld\n", timeleft); + } + kill_anon_super(s); fsc->client->extra_mon_dispatch = NULL; diff --git a/fs/ceph/super.h b/fs/ceph/super.h index 47d86068b92a..789b47c4e2b3 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -1399,4 +1399,7 @@ extern bool ceph_quota_update_statfs(struct ceph_fs_client *fsc, struct kstatfs *buf); extern void ceph_cleanup_quotarealms_inodes(struct ceph_mds_client *mdsc); +bool ceph_inc_mds_stopping_blocker(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session); +void ceph_dec_mds_stopping_blocker(struct ceph_mds_client *mdsc); #endif /* _FS_CEPH_SUPER_H */ -- 2.40.1
