diff options
Diffstat (limited to 'drivers/block/drbd/drbd_main.c')
| -rw-r--r-- | drivers/block/drbd/drbd_main.c | 3781 |
1 files changed, 1477 insertions, 2304 deletions
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index f55683ad4ff..8c13eeb83c5 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -56,14 +56,6 @@ #include "drbd_vli.h" -struct after_state_chg_work { - struct drbd_work w; - union drbd_state os; - union drbd_state ns; - enum chg_state_flags flags; - struct completion *done; -}; - static DEFINE_MUTEX(drbd_main_mutex); int drbdd_init(struct drbd_thread *); int drbd_worker(struct drbd_thread *); @@ -72,21 +64,17 @@ int drbd_asender(struct drbd_thread *); int drbd_init(void); static int drbd_open(struct block_device *bdev, fmode_t mode); static int drbd_release(struct gendisk *gd, fmode_t mode); -static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused); -static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, - union drbd_state ns, enum chg_state_flags flags); -static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused); +static int w_md_sync(struct drbd_work *w, int unused); static void md_sync_timer_fn(unsigned long data); -static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused); -static int w_go_diskless(struct drbd_conf *mdev, struct drbd_work *w, int unused); -static void _tl_clear(struct drbd_conf *mdev); +static int w_bitmap_io(struct drbd_work *w, int unused); +static int w_go_diskless(struct drbd_work *w, int unused); MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, " "Lars Ellenberg <lars@linbit.com>"); MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION); MODULE_VERSION(REL_VERSION); MODULE_LICENSE("GPL"); -MODULE_PARM_DESC(minor_count, "Maximum number of drbd devices (" +MODULE_PARM_DESC(minor_count, "Approximate number of drbd devices (" __stringify(DRBD_MINOR_COUNT_MIN) "-" __stringify(DRBD_MINOR_COUNT_MAX) ")"); MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR); @@ -98,7 +86,6 @@ MODULE_PARM_DESC(allow_oos, "DONT USE!"); module_param(minor_count, uint, 0444); module_param(disable_sendpage, bool, 0644); module_param(allow_oos, bool, 0); -module_param(cn_idx, uint, 0444); module_param(proc_details, int, 0644); #ifdef CONFIG_DRBD_FAULT_INJECTION @@ -120,7 +107,6 @@ module_param(fault_devs, int, 0644); unsigned int minor_count = DRBD_MINOR_COUNT_DEF; bool disable_sendpage; bool allow_oos; -unsigned int cn_idx = CN_IDX_DRBD; int proc_details; /* Detail level in proc drbd*/ /* Module parameter for setting the user mode helper program @@ -132,10 +118,11 @@ module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0 /* in 2.6.x, our device mapping and config info contains our virtual gendisks * as member "struct gendisk *vdisk;" */ -struct drbd_conf **minor_table; +struct idr minors; +struct list_head drbd_tconns; /* list of struct drbd_tconn */ struct kmem_cache *drbd_request_cache; -struct kmem_cache *drbd_ee_cache; /* epoch entries */ +struct kmem_cache *drbd_ee_cache; /* peer requests */ struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ mempool_t *drbd_request_mempool; @@ -164,10 +151,15 @@ static const struct block_device_operations drbd_ops = { struct bio *bio_alloc_drbd(gfp_t gfp_mask) { + struct bio *bio; + if (!drbd_md_io_bio_set) return bio_alloc(gfp_mask, 1); - return bio_alloc_bioset(gfp_mask, 1, drbd_md_io_bio_set); + bio = bio_alloc_bioset(gfp_mask, 1, drbd_md_io_bio_set); + if (!bio) + return NULL; + return bio; } #ifdef __CHECKER__ @@ -190,158 +182,87 @@ int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins) #endif /** - * DOC: The transfer log - * - * The transfer log is a single linked list of &struct drbd_tl_epoch objects. - * mdev->newest_tle points to the head, mdev->oldest_tle points to the tail - * of the list. There is always at least one &struct drbd_tl_epoch object. - * - * Each &struct drbd_tl_epoch has a circular double linked list of requests - * attached. - */ -static int tl_init(struct drbd_conf *mdev) -{ - struct drbd_tl_epoch *b; - - /* during device minor initialization, we may well use GFP_KERNEL */ - b = kmalloc(sizeof(struct drbd_tl_epoch), GFP_KERNEL); - if (!b) - return 0; - INIT_LIST_HEAD(&b->requests); - INIT_LIST_HEAD(&b->w.list); - b->next = NULL; - b->br_number = 4711; - b->n_writes = 0; - b->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */ - - mdev->oldest_tle = b; - mdev->newest_tle = b; - INIT_LIST_HEAD(&mdev->out_of_sequence_requests); - INIT_LIST_HEAD(&mdev->barrier_acked_requests); - - mdev->tl_hash = NULL; - mdev->tl_hash_s = 0; - - return 1; -} - -static void tl_cleanup(struct drbd_conf *mdev) -{ - D_ASSERT(mdev->oldest_tle == mdev->newest_tle); - D_ASSERT(list_empty(&mdev->out_of_sequence_requests)); - kfree(mdev->oldest_tle); - mdev->oldest_tle = NULL; - kfree(mdev->unused_spare_tle); - mdev->unused_spare_tle = NULL; - kfree(mdev->tl_hash); - mdev->tl_hash = NULL; - mdev->tl_hash_s = 0; -} - -/** - * _tl_add_barrier() - Adds a barrier to the transfer log - * @mdev: DRBD device. - * @new: Barrier to be added before the current head of the TL. - * - * The caller must hold the req_lock. - */ -void _tl_add_barrier(struct drbd_conf *mdev, struct drbd_tl_epoch *new) -{ - struct drbd_tl_epoch *newest_before; - - INIT_LIST_HEAD(&new->requests); - INIT_LIST_HEAD(&new->w.list); - new->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */ - new->next = NULL; - new->n_writes = 0; - - newest_before = mdev->newest_tle; - new->br_number = newest_before->br_number+1; - if (mdev->newest_tle != new) { - mdev->newest_tle->next = new; - mdev->newest_tle = new; - } -} - -/** - * tl_release() - Free or recycle the oldest &struct drbd_tl_epoch object of the TL - * @mdev: DRBD device. + * tl_release() - mark as BARRIER_ACKED all requests in the corresponding transfer log epoch + * @tconn: DRBD connection. * @barrier_nr: Expected identifier of the DRBD write barrier packet. * @set_size: Expected number of requests before that barrier. * * In case the passed barrier_nr or set_size does not match the oldest - * &struct drbd_tl_epoch objects this function will cause a termination - * of the connection. + * epoch of not yet barrier-acked requests, this function will cause a + * termination of the connection. */ -void tl_release(struct drbd_conf *mdev, unsigned int barrier_nr, - unsigned int set_size) +void tl_release(struct drbd_tconn *tconn, unsigned int barrier_nr, + unsigned int set_size) { - struct drbd_tl_epoch *b, *nob; /* next old barrier */ - struct list_head *le, *tle; struct drbd_request *r; - - spin_lock_irq(&mdev->req_lock); - - b = mdev->oldest_tle; + struct drbd_request *req = NULL; + int expect_epoch = 0; + int expect_size = 0; + + spin_lock_irq(&tconn->req_lock); + + /* find oldest not yet barrier-acked write request, + * count writes in its epoch. */ + list_for_each_entry(r, &tconn->transfer_log, tl_requests) { + const unsigned s = r->rq_state; + if (!req) { + if (!(s & RQ_WRITE)) + continue; + if (!(s & RQ_NET_MASK)) + continue; + if (s & RQ_NET_DONE) + continue; + req = r; + expect_epoch = req->epoch; + expect_size ++; + } else { + if (r->epoch != expect_epoch) + break; + if (!(s & RQ_WRITE)) + continue; + /* if (s & RQ_DONE): not expected */ + /* if (!(s & RQ_NET_MASK)): not expected */ + expect_size++; + } + } /* first some paranoia code */ - if (b == NULL) { - dev_err(DEV, "BAD! BarrierAck #%u received, but no epoch in tl!?\n", - barrier_nr); + if (req == NULL) { + conn_err(tconn, "BAD! BarrierAck #%u received, but no epoch in tl!?\n", + barrier_nr); goto bail; } - if (b->br_number != barrier_nr) { - dev_err(DEV, "BAD! BarrierAck #%u received, expected #%u!\n", - barrier_nr, b->br_number); + if (expect_epoch != barrier_nr) { + conn_err(tconn, "BAD! BarrierAck #%u received, expected #%u!\n", + barrier_nr, expect_epoch); goto bail; } - if (b->n_writes != set_size) { - dev_err(DEV, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n", - barrier_nr, set_size, b->n_writes); + + if (expect_size != set_size) { + conn_err(tconn, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n", + barrier_nr, set_size, expect_size); goto bail; } - /* Clean up list of requests processed during current epoch */ - list_for_each_safe(le, tle, &b->requests) { - r = list_entry(le, struct drbd_request, tl_requests); - _req_mod(r, barrier_acked); - } - /* There could be requests on the list waiting for completion - of the write to the local disk. To avoid corruptions of - slab's data structures we have to remove the lists head. - - Also there could have been a barrier ack out of sequence, overtaking - the write acks - which would be a bug and violating write ordering. - To not deadlock in case we lose connection while such requests are - still pending, we need some way to find them for the - _req_mode(connection_lost_while_pending). - - These have been list_move'd to the out_of_sequence_requests list in - _req_mod(, barrier_acked) above. - */ - list_splice_init(&b->requests, &mdev->barrier_acked_requests); - - nob = b->next; - if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) { - _tl_add_barrier(mdev, b); - if (nob) - mdev->oldest_tle = nob; - /* if nob == NULL b was the only barrier, and becomes the new - barrier. Therefore mdev->oldest_tle points already to b */ - } else { - D_ASSERT(nob != NULL); - mdev->oldest_tle = nob; - kfree(b); + /* Clean up list of requests processed during current epoch. */ + /* this extra list walk restart is paranoia, + * to catch requests being barrier-acked "unexpectedly". + * It usually should find the same req again, or some READ preceding it. */ + list_for_each_entry(req, &tconn->transfer_log, tl_requests) + if (req->epoch == expect_epoch) + break; + list_for_each_entry_safe_from(req, r, &tconn->transfer_log, tl_requests) { + if (req->epoch != expect_epoch) + break; + _req_mod(req, BARRIER_ACKED); } - - spin_unlock_irq(&mdev->req_lock); - dec_ap_pending(mdev); + spin_unlock_irq(&tconn->req_lock); return; bail: - spin_unlock_irq(&mdev->req_lock); - drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); + spin_unlock_irq(&tconn->req_lock); + conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); } @@ -350,85 +271,24 @@ bail: * @mdev: DRBD device. * @what: The action/event to perform with all request objects * - * @what might be one of connection_lost_while_pending, resend, fail_frozen_disk_io, - * restart_frozen_disk_io. + * @what might be one of CONNECTION_LOST_WHILE_PENDING, RESEND, FAIL_FROZEN_DISK_IO, + * RESTART_FROZEN_DISK_IO. */ -static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what) -{ - struct drbd_tl_epoch *b, *tmp, **pn; - struct list_head *le, *tle, carry_reads; - struct drbd_request *req; - int rv, n_writes, n_reads; - - b = mdev->oldest_tle; - pn = &mdev->oldest_tle; - while (b) { - n_writes = 0; - n_reads = 0; - INIT_LIST_HEAD(&carry_reads); - list_for_each_safe(le, tle, &b->requests) { - req = list_entry(le, struct drbd_request, tl_requests); - rv = _req_mod(req, what); - - n_writes += (rv & MR_WRITE) >> MR_WRITE_SHIFT; - n_reads += (rv & MR_READ) >> MR_READ_SHIFT; - } - tmp = b->next; - - if (n_writes) { - if (what == resend) { - b->n_writes = n_writes; - if (b->w.cb == NULL) { - b->w.cb = w_send_barrier; - inc_ap_pending(mdev); - set_bit(CREATE_BARRIER, &mdev->flags); - } - - drbd_queue_work(&mdev->data.work, &b->w); - } - pn = &b->next; - } else { - if (n_reads) - list_add(&carry_reads, &b->requests); - /* there could still be requests on that ring list, - * in case local io is still pending */ - list_del(&b->requests); - - /* dec_ap_pending corresponding to queue_barrier. - * the newest barrier may not have been queued yet, - * in which case w.cb is still NULL. */ - if (b->w.cb != NULL) - dec_ap_pending(mdev); - - if (b == mdev->newest_tle) { - /* recycle, but reinit! */ - D_ASSERT(tmp == NULL); - INIT_LIST_HEAD(&b->requests); - list_splice(&carry_reads, &b->requests); - INIT_LIST_HEAD(&b->w.list); - b->w.cb = NULL; - b->br_number = net_random(); - b->n_writes = 0; - - *pn = b; - break; - } - *pn = tmp; - kfree(b); - } - b = tmp; - list_splice(&carry_reads, &b->requests); - } - - /* Actions operating on the disk state, also want to work on - requests that got barrier acked. */ +/* must hold resource->req_lock */ +void _tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what) +{ + struct drbd_request *req, *r; - list_for_each_safe(le, tle, &mdev->barrier_acked_requests) { - req = list_entry(le, struct drbd_request, tl_requests); + list_for_each_entry_safe(req, r, &tconn->transfer_log, tl_requests) _req_mod(req, what); - } } +void tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what) +{ + spin_lock_irq(&tconn->req_lock); + _tl_restart(tconn, what); + spin_unlock_irq(&tconn->req_lock); +} /** * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL @@ -438,43 +298,9 @@ static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what) * by the requests on the transfer gets marked as our of sync. Called from the * receiver thread and the worker thread. */ -void tl_clear(struct drbd_conf *mdev) +void tl_clear(struct drbd_tconn *tconn) { - spin_lock_irq(&mdev->req_lock); - _tl_clear(mdev); - spin_unlock_irq(&mdev->req_lock); -} - -static void _tl_clear(struct drbd_conf *mdev) -{ - struct list_head *le, *tle; - struct drbd_request *r; - - _tl_restart(mdev, connection_lost_while_pending); - - /* we expect this list to be empty. */ - D_ASSERT(list_empty(&mdev->out_of_sequence_requests)); - - /* but just in case, clean it up anyways! */ - list_for_each_safe(le, tle, &mdev->out_of_sequence_requests) { - r = list_entry(le, struct drbd_request, tl_requests); - /* It would be nice to complete outside of spinlock. - * But this is easier for now. */ - _req_mod(r, connection_lost_while_pending); - } - - /* ensure bit indicating barrier is required is clear */ - clear_bit(CREATE_BARRIER, &mdev->flags); - - memset(mdev->app_reads_hash, 0, APP_R_HSIZE*sizeof(void *)); - -} - -void tl_restart(struct drbd_conf *mdev, enum drbd_req_event what) -{ - spin_lock_irq(&mdev->req_lock); - _tl_restart(mdev, what); - spin_unlock_irq(&mdev->req_lock); + tl_restart(tconn, CONNECTION_LOST_WHILE_PENDING); } /** @@ -483,1377 +309,131 @@ void tl_restart(struct drbd_conf *mdev, enum drbd_req_event what) */ void tl_abort_disk_io(struct drbd_conf *mdev) { - struct drbd_tl_epoch *b; - struct list_head *le, *tle; - struct drbd_request *req; - - spin_lock_irq(&mdev->req_lock); - b = mdev->oldest_tle; - while (b) { - list_for_each_safe(le, tle, &b->requests) { - req = list_entry(le, struct drbd_request, tl_requests); - if (!(req->rq_state & RQ_LOCAL_PENDING)) - continue; - _req_mod(req, abort_disk_io); - } - b = b->next; - } + struct drbd_tconn *tconn = mdev->tconn; + struct drbd_request *req, *r; - list_for_each_safe(le, tle, &mdev->barrier_acked_requests) { - req = list_entry(le, struct drbd_request, tl_requests); + spin_lock_irq(&tconn->req_lock); + list_for_each_entry_safe(req, r, &tconn->transfer_log, tl_requests) { if (!(req->rq_state & RQ_LOCAL_PENDING)) continue; - _req_mod(req, abort_disk_io); - } - - spin_unlock_irq(&mdev->req_lock); -} - -/** - * cl_wide_st_chg() - true if the state change is a cluster wide one - * @mdev: DRBD device. - * @os: old (current) state. - * @ns: new (wanted) state. - */ -static int cl_wide_st_chg(struct drbd_conf *mdev, - union drbd_state os, union drbd_state ns) -{ - return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED && - ((os.role != R_PRIMARY && ns.role == R_PRIMARY) || - (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) || - (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) || - (os.disk != D_FAILED && ns.disk == D_FAILED))) || - (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) || - (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S); -} - -enum drbd_state_rv -drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f, - union drbd_state mask, union drbd_state val) -{ - unsigned long flags; - union drbd_state os, ns; - enum drbd_state_rv rv; - - spin_lock_irqsave(&mdev->req_lock, flags); - os = mdev->state; - ns.i = (os.i & ~mask.i) | val.i; - rv = _drbd_set_state(mdev, ns, f, NULL); - ns = mdev->state; - spin_unlock_irqrestore(&mdev->req_lock, flags); - - return rv; -} - -/** - * drbd_force_state() - Impose a change which happens outside our control on our state - * @mdev: DRBD device. - * @mask: mask of state bits to change. - * @val: value of new state bits. - */ -void drbd_force_state(struct drbd_conf *mdev, - union drbd_state mask, union drbd_state val) -{ - drbd_change_state(mdev, CS_HARD, mask, val); -} - -static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state); -static enum drbd_state_rv is_valid_state_transition(struct drbd_conf *, - union drbd_state, - union drbd_state); -enum sanitize_state_warnings { - NO_WARNING, - ABORTED_ONLINE_VERIFY, - ABORTED_RESYNC, - CONNECTION_LOST_NEGOTIATING, - IMPLICITLY_UPGRADED_DISK, - IMPLICITLY_UPGRADED_PDSK, -}; -static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os, - union drbd_state ns, enum sanitize_state_warnings *warn); -int drbd_send_state_req(struct drbd_conf *, - union drbd_state, union drbd_state); - -static enum drbd_state_rv -_req_st_cond(struct drbd_conf *mdev, union drbd_state mask, - union drbd_state val) -{ - union drbd_state os, ns; - unsigned long flags; - enum drbd_state_rv rv; - - if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags)) - return SS_CW_SUCCESS; - - if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags)) - return SS_CW_FAILED_BY_PEER; - - rv = 0; - spin_lock_irqsave(&mdev->req_lock, flags); - os = mdev->state; - ns.i = (os.i & ~mask.i) | val.i; - ns = sanitize_state(mdev, os, ns, NULL); - - if (!cl_wide_st_chg(mdev, os, ns)) - rv = SS_CW_NO_NEED; - if (!rv) { - rv = is_valid_state(mdev, ns); - if (rv == SS_SUCCESS) { - rv = is_valid_state_transition(mdev, ns, os); - if (rv == SS_SUCCESS) - rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */ - } - } - spin_unlock_irqrestore(&mdev->req_lock, flags); - - return rv; -} - -/** - * drbd_req_state() - Perform an eventually cluster wide state change - * @mdev: DRBD device. - * @mask: mask of state bits to change. - * @val: value of new state bits. - * @f: flags - * - * Should not be called directly, use drbd_request_state() or - * _drbd_request_state(). - */ -static enum drbd_state_rv -drbd_req_state(struct drbd_conf *mdev, union drbd_state mask, - union drbd_state val, enum chg_state_flags f) -{ - struct completion done; - unsigned long flags; - union drbd_state os, ns; - enum drbd_state_rv rv; - - init_completion(&done); - - if (f & CS_SERIALIZE) - mutex_lock(&mdev->state_mutex); - - spin_lock_irqsave(&mdev->req_lock, flags); - os = mdev->state; - ns.i = (os.i & ~mask.i) | val.i; - ns = sanitize_state(mdev, os, ns, NULL); - - if (cl_wide_st_chg(mdev, os, ns)) { - rv = is_valid_state(mdev, ns); - if (rv == SS_SUCCESS) - rv = is_valid_state_transition(mdev, ns, os); - spin_unlock_irqrestore(&mdev->req_lock, flags); - - if (rv < SS_SUCCESS) { - if (f & CS_VERBOSE) - print_st_err(mdev, os, ns, rv); - goto abort; - } - - drbd_state_lock(mdev); - if (!drbd_send_state_req(mdev, mask, val)) { - drbd_state_unlock(mdev); - rv = SS_CW_FAILED_BY_PEER; - if (f & CS_VERBOSE) - print_st_err(mdev, os, ns, rv); - goto abort; - } - - wait_event(mdev->state_wait, - (rv = _req_st_cond(mdev, mask, val))); - - if (rv < SS_SUCCESS) { - drbd_state_unlock(mdev); - if (f & CS_VERBOSE) - print_st_err(mdev, os, ns, rv); - goto abort; - } - spin_lock_irqsave(&mdev->req_lock, flags); - os = mdev->state; - ns.i = (os.i & ~mask.i) | val.i; - rv = _drbd_set_state(mdev, ns, f, &done); - drbd_state_unlock(mdev); - } else { - rv = _drbd_set_state(mdev, ns, f, &done); - } - - spin_unlock_irqrestore(&mdev->req_lock, flags); - - if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) { - D_ASSERT(current != mdev->worker.task); - wait_for_completion(&done); - } - -abort: - if (f & CS_SERIALIZE) - mutex_unlock(&mdev->state_mutex); - - return rv; -} - -/** - * _drbd_request_state() - Request a state change (with flags) - * @mdev: DRBD device. - * @mask: mask of state bits to change. - * @val: value of new state bits. - * @f: flags - * - * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE - * flag, or when logging of failed state change requests is not desired. - */ -enum drbd_state_rv -_drbd_request_state(struct drbd_conf *mdev, union drbd_state mask, - union drbd_state val, enum chg_state_flags f) -{ - enum drbd_state_rv rv; - - wait_event(mdev->state_wait, - (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE); - - return rv; -} - -static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns) -{ - dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c }\n", - name, - drbd_conn_str(ns.conn), - drbd_role_str(ns.role), - drbd_role_str(ns.peer), - drbd_disk_str(ns.disk), - drbd_disk_str(ns.pdsk), - is_susp(ns) ? 's' : 'r', - ns.aftr_isp ? 'a' : '-', - ns.peer_isp ? 'p' : '-', - ns.user_isp ? 'u' : '-' - ); -} - -void print_st_err(struct drbd_conf *mdev, union drbd_state os, - union drbd_state ns, enum drbd_state_rv err) -{ - if (err == SS_IN_TRANSIENT_STATE) - return; - dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err)); - print_st(mdev, " state", os); - print_st(mdev, "wanted", ns); -} - - -/** - * is_valid_state() - Returns an SS_ error code if ns is not valid - * @mdev: DRBD device. - * @ns: State to consider. - */ -static enum drbd_state_rv -is_valid_state(struct drbd_conf *mdev, union drbd_state ns) -{ - /* See drbd_state_sw_errors in drbd_strings.c */ - - enum drbd_fencing_p fp; - enum drbd_state_rv rv = SS_SUCCESS; - - fp = FP_DONT_CARE; - if (get_ldev(mdev)) { - fp = mdev->ldev->dc.fencing; - put_ldev(mdev); - } - - if (get_net_conf(mdev)) { - if (!mdev->net_conf->two_primaries && - ns.role == R_PRIMARY && ns.peer == R_PRIMARY) - rv = SS_TWO_PRIMARIES; - put_net_conf(mdev); - } - - if (rv <= 0) - /* already found a reason to abort */; - else if (ns.role == R_SECONDARY && mdev->open_cnt) - rv = SS_DEVICE_IN_USE; - - else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE) - rv = SS_NO_UP_TO_DATE_DISK; - - else if (fp >= FP_RESOURCE && - ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN) - rv = SS_PRIMARY_NOP; - - else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT) - rv = SS_NO_UP_TO_DATE_DISK; - - else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT) - rv = SS_NO_LOCAL_DISK; - - else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT) - rv = SS_NO_REMOTE_DISK; - - else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) - rv = SS_NO_UP_TO_DATE_DISK; - - else if ((ns.conn == C_CONNECTED || - ns.conn == C_WF_BITMAP_S || - ns.conn == C_SYNC_SOURCE || - ns.conn == C_PAUSED_SYNC_S) && - ns.disk == D_OUTDATED) - rv = SS_CONNECTED_OUTDATES; - - else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && - (mdev->sync_conf.verify_alg[0] == 0)) - rv = SS_NO_VERIFY_ALG; - - else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && - mdev->agreed_pro_version < 88) - rv = SS_NOT_SUPPORTED; - - else if (ns.conn >= C_CONNECTED && ns.pdsk == D_UNKNOWN) - rv = SS_CONNECTED_OUTDATES; - - return rv; -} - -/** - * is_valid_state_transition() - Returns an SS_ error code if the state transition is not possible - * @mdev: DRBD device. - * @ns: new state. - * @os: old state. - */ -static enum drbd_state_rv -is_valid_state_transition(struct drbd_conf *mdev, union drbd_state ns, - union drbd_state os) -{ - enum drbd_state_rv rv = SS_SUCCESS; - - if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) && - os.conn > C_CONNECTED) - rv = SS_RESYNC_RUNNING; - - if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE) - rv = SS_ALREADY_STANDALONE; - - if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS) - rv = SS_IS_DISKLESS; - - if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED) - rv = SS_NO_NET_CONFIG; - - if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING) - rv = SS_LOWER_THAN_OUTDATED; - - if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED) - rv = SS_IN_TRANSIENT_STATE; - - if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS) - rv = SS_IN_TRANSIENT_STATE; - - /* While establishing a connection only allow cstate to change. - Delay/refuse role changes, detach attach etc... */ - if (test_bit(STATE_SENT, &mdev->flags) && - !(os.conn == C_WF_REPORT_PARAMS || - (ns.conn == C_WF_REPORT_PARAMS && os.conn == C_WF_CONNECTION))) - rv = SS_IN_TRANSIENT_STATE; - - if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED) - rv = SS_NEED_CONNECTION; - - if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && - ns.conn != os.conn && os.conn > C_CONNECTED) - rv = SS_RESYNC_RUNNING; - - if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) && - os.conn < C_CONNECTED) - rv = SS_NEED_CONNECTION; - - if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE) - && os.conn < C_WF_REPORT_PARAMS) - rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */ - - return rv; -} - -static void print_sanitize_warnings(struct drbd_conf *mdev, enum sanitize_state_warnings warn) -{ - static const char *msg_table[] = { - [NO_WARNING] = "", - [ABORTED_ONLINE_VERIFY] = "Online-verify aborted.", - [ABORTED_RESYNC] = "Resync aborted.", - [CONNECTION_LOST_NEGOTIATING] = "Connection lost while negotiating, no data!", - [IMPLICITLY_UPGRADED_DISK] = "Implicitly upgraded disk", - [IMPLICITLY_UPGRADED_PDSK] = "Implicitly upgraded pdsk", - }; - - if (warn != NO_WARNING) - dev_warn(DEV, "%s\n", msg_table[warn]); -} - -/** - * sanitize_state() - Resolves implicitly necessary additional changes to a state transition - * @mdev: DRBD device. - * @os: old state. - * @ns: new state. - * @warn_sync_abort: - * - * When we loose connection, we have to set the state of the peers disk (pdsk) - * to D_UNKNOWN. This rule and many more along those lines are in this function. - */ -static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os, - union drbd_state ns, enum sanitize_state_warnings *warn) -{ - enum drbd_fencing_p fp; - enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max; - - if (warn) - *warn = NO_WARNING; - - fp = FP_DONT_CARE; - if (get_ldev(mdev)) { - fp = mdev->ldev->dc.fencing; - put_ldev(mdev); - } - - /* Disallow Network errors to configure a device's network part */ - if ((ns.conn >= C_TIMEOUT && ns.conn <= C_TEAR_DOWN) && - os.conn <= C_DISCONNECTING) - ns.conn = os.conn; - - /* After a network error (+C_TEAR_DOWN) only C_UNCONNECTED or C_DISCONNECTING can follow. - * If you try to go into some Sync* state, that shall fail (elsewhere). */ - if (os.conn >= C_TIMEOUT && os.conn <= C_TEAR_DOWN && - ns.conn != C_UNCONNECTED && ns.conn != C_DISCONNECTING && ns.conn <= C_CONNECTED) - ns.conn = os.conn; - - /* we cannot fail (again) if we already detached */ - if (ns.disk == D_FAILED && os.disk == D_DISKLESS) - ns.disk = D_DISKLESS; - - /* After C_DISCONNECTING only C_STANDALONE may follow */ - if (os.conn == C_DISCONNECTING && ns.conn != C_STANDALONE) - ns.conn = os.conn; - - if (ns.conn < C_CONNECTED) { - ns.peer_isp = 0; - ns.peer = R_UNKNOWN; - if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT) - ns.pdsk = D_UNKNOWN; - } - - /* Clear the aftr_isp when becoming unconfigured */ - if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY) - ns.aftr_isp = 0; - - /* Abort resync if a disk fails/detaches */ - if (os.conn > C_CONNECTED && ns.conn > C_CONNECTED && - (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) { - if (warn) - *warn = os.conn == C_VERIFY_S || os.conn == C_VERIFY_T ? - ABORTED_ONLINE_VERIFY : ABORTED_RESYNC; - ns.conn = C_CONNECTED; - } - - /* Connection breaks down before we finished "Negotiating" */ - if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING && - get_ldev_if_state(mdev, D_NEGOTIATING)) { - if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) { - ns.disk = mdev->new_state_tmp.disk; - ns.pdsk = mdev->new_state_tmp.pdsk; - } else { - if (warn) - *warn = CONNECTION_LOST_NEGOTIATING; - ns.disk = D_DISKLESS; - ns.pdsk = D_UNKNOWN; - } - put_ldev(mdev); - } - - /* D_CONSISTENT and D_OUTDATED vanish when we get connected */ - if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) { - if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED) - ns.disk = D_UP_TO_DATE; - if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED) - ns.pdsk = D_UP_TO_DATE; - } - - /* Implications of the connection stat on the disk states */ - disk_min = D_DISKLESS; - disk_max = D_UP_TO_DATE; - pdsk_min = D_INCONSISTENT; - pdsk_max = D_UNKNOWN; - switch ((enum drbd_conns)ns.conn) { - case C_WF_BITMAP_T: - case C_PAUSED_SYNC_T: - case C_STARTING_SYNC_T: - case C_WF_SYNC_UUID: - case C_BEHIND: - disk_min = D_INCONSISTENT; - disk_max = D_OUTDATED; - pdsk_min = D_UP_TO_DATE; - pdsk_max = D_UP_TO_DATE; - break; - case C_VERIFY_S: - case C_VERIFY_T: - disk_min = D_UP_TO_DATE; - disk_max = D_UP_TO_DATE; - pdsk_min = D_UP_TO_DATE; - pdsk_max = D_UP_TO_DATE; - break; - case C_CONNECTED: - disk_min = D_DISKLESS; - disk_max = D_UP_TO_DATE; - pdsk_min = D_DISKLESS; - pdsk_max = D_UP_TO_DATE; - break; - case C_WF_BITMAP_S: - case C_PAUSED_SYNC_S: - case C_STARTING_SYNC_S: - case C_AHEAD: - disk_min = D_UP_TO_DATE; - disk_max = D_UP_TO_DATE; - pdsk_min = D_INCONSISTENT; - pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/ - break; - case C_SYNC_TARGET: - disk_min = D_INCONSISTENT; - disk_max = D_INCONSISTENT; - pdsk_min = D_UP_TO_DATE; - pdsk_max = D_UP_TO_DATE; - break; - case C_SYNC_SOURCE: - disk_min = D_UP_TO_DATE; - disk_max = D_UP_TO_DATE; - pdsk_min = D_INCONSISTENT; - pdsk_max = D_INCONSISTENT; - break; - case C_STANDALONE: - case C_DISCONNECTING: - case C_UNCONNECTED: - case C_TIMEOUT: - case C_BROKEN_PIPE: - case C_NETWORK_FAILURE: - case C_PROTOCOL_ERROR: - case C_TEAR_DOWN: - case C_WF_CONNECTION: - case C_WF_REPORT_PARAMS: - case C_MASK: - break; - } - if (ns.disk > disk_max) - ns.disk = disk_max; - - if (ns.disk < disk_min) { - if (warn) - *warn = IMPLICITLY_UPGRADED_DISK; - ns.disk = disk_min; - } - if (ns.pdsk > pdsk_max) - ns.pdsk = pdsk_max; - - if (ns.pdsk < pdsk_min) { - if (warn) - *warn = IMPLICITLY_UPGRADED_PDSK; - ns.pdsk = pdsk_min; - } - - if (fp == FP_STONITH && - (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED) && - !(os.role == R_PRIMARY && os.conn < C_CONNECTED && os.pdsk > D_OUTDATED)) - ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */ - - if (mdev->sync_conf.on_no_data == OND_SUSPEND_IO && - (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) && - !(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE)) - ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */ - - if (ns.aftr_isp || ns.peer_isp || ns.user_isp) { - if (ns.conn == C_SYNC_SOURCE) - ns.conn = C_PAUSED_SYNC_S; - if (ns.conn == C_SYNC_TARGET) - ns.conn = C_PAUSED_SYNC_T; - } else { - if (ns.conn == C_PAUSED_SYNC_S) - ns.conn = C_SYNC_SOURCE; - if (ns.conn == C_PAUSED_SYNC_T) - ns.conn = C_SYNC_TARGET; - } - - return ns; -} - -/* helper for __drbd_set_state */ -static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs) -{ - if (mdev->agreed_pro_version < 90) - mdev->ov_start_sector = 0; - mdev->rs_total = drbd_bm_bits(mdev); - mdev->ov_position = 0; - if (cs == C_VERIFY_T) { - /* starting online verify from an arbitrary position - * does not fit well into the existing protocol. - * on C_VERIFY_T, we initialize ov_left and friends - * implicitly in receive_DataRequest once the - * first P_OV_REQUEST is received */ - mdev->ov_start_sector = ~(sector_t)0; - } else { - unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector); - if (bit >= mdev->rs_total) { - mdev->ov_start_sector = - BM_BIT_TO_SECT(mdev->rs_total - 1); - mdev->rs_total = 1; - } else - mdev->rs_total -= bit; - mdev->ov_position = mdev->ov_start_sector; - } - mdev->ov_left = mdev->rs_total; -} - -static void drbd_resume_al(struct drbd_conf *mdev) -{ - if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags)) - dev_info(DEV, "Resumed AL updates\n"); -} - -/** - * __drbd_set_state() - Set a new DRBD state - * @mdev: DRBD device. - * @ns: new state. - * @flags: Flags - * @done: Optional completion, that will get completed after the after_state_ch() finished - * - * Caller needs to hold req_lock, and global_state_lock. Do not call directly. - */ -enum drbd_state_rv -__drbd_set_state(struct drbd_conf *mdev, union drbd_state ns, - enum chg_state_flags flags, struct completion *done) -{ - union drbd_state os; - enum drbd_state_rv rv = SS_SUCCESS; - enum sanitize_state_warnings ssw; - struct after_state_chg_work *ascw; - - os = mdev->state; - - ns = sanitize_state(mdev, os, ns, &ssw); - - if (ns.i == os.i) - return SS_NOTHING_TO_DO; - - if (!(flags & CS_HARD)) { - /* pre-state-change checks ; only look at ns */ - /* See drbd_state_sw_errors in drbd_strings.c */ - - rv = is_valid_state(mdev, ns); - if (rv < SS_SUCCESS) { - /* If the old state was illegal as well, then let - this happen...*/ - - if (is_valid_state(mdev, os) == rv) - rv = is_valid_state_transition(mdev, ns, os); - } else - rv = is_valid_state_transition(mdev, ns, os); - } - - if (rv < SS_SUCCESS) { - if (flags & CS_VERBOSE) - print_st_err(mdev, os, ns, rv); - return rv; - } - - print_sanitize_warnings(mdev, ssw); - - { - char *pbp, pb[300]; - pbp = pb; - *pbp = 0; - if (ns.role != os.role) - pbp += sprintf(pbp, "role( %s -> %s ) ", - drbd_role_str(os.role), - drbd_role_str(ns.role)); - if (ns.peer != os.peer) - pbp += sprintf(pbp, "peer( %s -> %s ) ", - drbd_role_str(os.peer), - drbd_role_str(ns.peer)); - if (ns.conn != os.conn) - pbp += sprintf(pbp, "conn( %s -> %s ) ", - drbd_conn_str(os.conn), - drbd_conn_str(ns.conn)); - if (ns.disk != os.disk) - pbp += sprintf(pbp, "disk( %s -> %s ) ", - drbd_disk_str(os.disk), - drbd_disk_str(ns.disk)); - if (ns.pdsk != os.pdsk) - pbp += sprintf(pbp, "pdsk( %s -> %s ) ", - drbd_disk_str(os.pdsk), - drbd_disk_str(ns.pdsk)); - if (is_susp(ns) != is_susp(os)) - pbp += sprintf(pbp, "susp( %d -> %d ) ", - is_susp(os), - is_susp(ns)); - if (ns.aftr_isp != os.aftr_isp) - pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ", - os.aftr_isp, - ns.aftr_isp); - if (ns.peer_isp != os.peer_isp) - pbp += sprintf(pbp, "peer_isp( %d -> %d ) ", - os.peer_isp, - ns.peer_isp); - if (ns.user_isp != os.user_isp) - pbp += sprintf(pbp, "user_isp( %d -> %d ) ", - os.user_isp, - ns.user_isp); - dev_info(DEV, "%s\n", pb); - } - - /* solve the race between becoming unconfigured, - * worker doing the cleanup, and - * admin reconfiguring us: - * on (re)configure, first set CONFIG_PENDING, - * then wait for a potentially exiting worker, - * start the worker, and schedule one no_op. - * then proceed with configuration. - */ - if (ns.disk == D_DISKLESS && - ns.conn == C_STANDALONE && - ns.role == R_SECONDARY && - !test_and_set_bit(CONFIG_PENDING, &mdev->flags)) - set_bit(DEVICE_DYING, &mdev->flags); - - /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference - * on the ldev here, to be sure the transition -> D_DISKLESS resp. - * drbd_ldev_destroy() won't happen before our corresponding - * after_state_ch works run, where we put_ldev again. */ - if ((os.disk != D_FAILED && ns.disk == D_FAILED) || - (os.disk != D_DISKLESS && ns.disk == D_DISKLESS)) - atomic_inc(&mdev->local_cnt); - - mdev->state = ns; - - if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING) - drbd_print_uuids(mdev, "attached to UUIDs"); - - wake_up(&mdev->misc_wait); - wake_up(&mdev->state_wait); - - /* aborted verify run. log the last position */ - if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) && - ns.conn < C_CONNECTED) { - mdev->ov_start_sector = - BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left); - dev_info(DEV, "Online Verify reached sector %llu\n", - (unsigned long long)mdev->ov_start_sector); - } - - if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) && - (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) { - dev_info(DEV, "Syncer continues.\n"); - mdev->rs_paused += (long)jiffies - -(long)mdev->rs_mark_time[mdev->rs_last_mark]; - if (ns.conn == C_SYNC_TARGET) - mod_timer(&mdev->resync_timer, jiffies); - } - - if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) && - (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) { - dev_info(DEV, "Resync suspended\n"); - mdev->rs_mark_time[mdev->rs_last_mark] = jiffies; - } - - if (os.conn == C_CONNECTED && - (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) { - unsigned long now = jiffies; - int i; - - set_ov_position(mdev, ns.conn); - mdev->rs_start = now; - mdev->rs_last_events = 0; - mdev->rs_last_sect_ev = 0; - mdev->ov_last_oos_size = 0; - mdev->ov_last_oos_start = 0; - - for (i = 0; i < DRBD_SYNC_MARKS; i++) { - mdev->rs_mark_left[i] = mdev->ov_left; - mdev->rs_mark_time[i] = now; - } - - drbd_rs_controller_reset(mdev); - - if (ns.conn == C_VERIFY_S) { - dev_info(DEV, "Starting Online Verify from sector %llu\n", - (unsigned long long)mdev->ov_position); - mod_timer(&mdev->resync_timer, jiffies); - } - } - - if (get_ldev(mdev)) { - u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND| - MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE| - MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY); - - if (test_bit(CRASHED_PRIMARY, &mdev->flags)) - mdf |= MDF_CRASHED_PRIMARY; - if (mdev->state.role == R_PRIMARY || - (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY)) - mdf |= MDF_PRIMARY_IND; - if (mdev->state.conn > C_WF_REPORT_PARAMS) - mdf |= MDF_CONNECTED_IND; - if (mdev->state.disk > D_INCONSISTENT) - mdf |= MDF_CONSISTENT; - if (mdev->state.disk > D_OUTDATED) - mdf |= MDF_WAS_UP_TO_DATE; - if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT) - mdf |= MDF_PEER_OUT_DATED; - if (mdf != mdev->ldev->md.flags) { - mdev->ldev->md.flags = mdf; - drbd_md_mark_dirty(mdev); - } - if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT) - drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]); - put_ldev(mdev); - } - - /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */ - if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT && - os.peer == R_SECONDARY && ns.peer == R_PRIMARY) - set_bit(CONSIDER_RESYNC, &mdev->flags); - - /* Receiver should clean up itself */ - if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING) - drbd_thread_stop_nowait(&mdev->receiver); - - /* Now the receiver finished cleaning up itself, it should die */ - if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE) - drbd_thread_stop_nowait(&mdev->receiver); - - /* Upon network failure, we need to restart the receiver. */ - if (os.conn > C_WF_CONNECTION && - ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT) - drbd_thread_restart_nowait(&mdev->receiver); - - /* Resume AL writing if we get a connection */ - if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) - drbd_resume_al(mdev); - - /* remember last connect and attach times so request_timer_fn() won't - * kill newly established sessions while we are still trying to thaw - * previously frozen IO */ - if (os.conn != C_WF_REPORT_PARAMS && ns.conn == C_WF_REPORT_PARAMS) - mdev->last_reconnect_jif = jiffies; - if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) && - ns.disk > D_NEGOTIATING) - mdev->last_reattach_jif = jiffies; - - ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC); - if (ascw) { - ascw->os = os; - ascw->ns = ns; - ascw->flags = flags; - ascw->w.cb = w_after_state_ch; - ascw->done = done; - drbd_queue_work(&mdev->data.work, &ascw->w); - } else { - dev_warn(DEV, "Could not kmalloc an ascw\n"); - } - - return rv; -} - -static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused) -{ - struct after_state_chg_work *ascw = - container_of(w, struct after_state_chg_work, w); - after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags); - if (ascw->flags & CS_WAIT_COMPLETE) { - D_ASSERT(ascw->done != NULL); - complete(ascw->done); - } - kfree(ascw); - - return 1; -} - -static void abw_start_sync(struct drbd_conf *mdev, int rv) -{ - if (rv) { - dev_err(DEV, "Writing the bitmap failed not starting resync.\n"); - _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE); - return; - } - - switch (mdev->state.conn) { - case C_STARTING_SYNC_T: - _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); - break; - case C_STARTING_SYNC_S: - drbd_start_resync(mdev, C_SYNC_SOURCE); - break; - } -} - -int drbd_bitmap_io_from_worker(struct drbd_conf *mdev, - int (*io_fn)(struct drbd_conf *), - char *why, enum bm_flag flags) -{ - int rv; - - D_ASSERT(current == mdev->worker.task); - - /* open coded non-blocking drbd_suspend_io(mdev); */ - set_bit(SUSPEND_IO, &mdev->flags); - - drbd_bm_lock(mdev, why, flags); - rv = io_fn(mdev); - drbd_bm_unlock(mdev); - - drbd_resume_io(mdev); - - return rv; -} - -/** - * after_state_ch() - Perform after state change actions that may sleep - * @mdev: DRBD device. - * @os: old state. - * @ns: new state. - * @flags: Flags - */ -static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, - union drbd_state ns, enum chg_state_flags flags) -{ - enum drbd_fencing_p fp; - enum drbd_req_event what = nothing; - union drbd_state nsm = (union drbd_state){ .i = -1 }; - - if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) { - clear_bit(CRASHED_PRIMARY, &mdev->flags); - if (mdev->p_uuid) - mdev->p_uuid[UI_FLAGS] &= ~((u64)2); - } - - fp = FP_DONT_CARE; - if (get_ldev(mdev)) { - fp = mdev->ldev->dc.fencing; - put_ldev(mdev); - } - - /* Inform userspace about the change... */ - drbd_bcast_state(mdev, ns); - - if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) && - (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)) - drbd_khelper(mdev, "pri-on-incon-degr"); - - /* Here we have the actions that are performed after a - state change. This function might sleep */ - - if (os.disk <= D_NEGOTIATING && ns.disk > D_NEGOTIATING) - mod_timer(&mdev->request_timer, jiffies + HZ); - - nsm.i = -1; - if (ns.susp_nod) { - if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) - what = resend; - - if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) && - ns.disk > D_NEGOTIATING) - what = restart_frozen_disk_io; - - if (what != nothing) - nsm.susp_nod = 0; - } - - if (ns.susp_fen) { - /* case1: The outdate peer handler is successful: */ - if (os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) { - if (test_bit(NEW_CUR_UUID, &mdev->flags)) { - drbd_uuid_new_current(mdev); - clear_bit(NEW_CUR_UUID, &mdev->flags); - } - spin_lock_irq(&mdev->req_lock); - _tl_clear(mdev); - _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL); - spin_unlock_irq(&mdev->req_lock); - } - /* case2: The connection was established again: */ - if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) { - clear_bit(NEW_CUR_UUID, &mdev->flags); - what = resend; - nsm.susp_fen = 0; - } - } - - if (what != nothing) { - spin_lock_irq(&mdev->req_lock); - _tl_restart(mdev, what); - nsm.i &= mdev->state.i; - _drbd_set_state(mdev, nsm, CS_VERBOSE, NULL); - spin_unlock_irq(&mdev->req_lock); - } - - /* Became sync source. With protocol >= 96, we still need to send out - * the sync uuid now. Need to do that before any drbd_send_state, or - * the other side may go "paused sync" before receiving the sync uuids, - * which is unexpected. */ - if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) && - (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) && - mdev->agreed_pro_version >= 96 && get_ldev(mdev)) { - drbd_gen_and_send_sync_uuid(mdev); - put_ldev(mdev); - } - - /* Do not change the order of the if above and the two below... */ - if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */ - /* we probably will start a resync soon. - * make sure those things are properly reset. */ - mdev->rs_total = 0; - mdev->rs_failed = 0; - atomic_set(&mdev->rs_pending_cnt, 0); - drbd_rs_cancel_all(mdev); - - drbd_send_uuids(mdev); - drbd_send_state(mdev, ns); - } - /* No point in queuing send_bitmap if we don't have a connection - * anymore, so check also the _current_ state, not only the new state - * at the time this work was queued. */ - if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S && - mdev->state.conn == C_WF_BITMAP_S) - drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL, - "send_bitmap (WFBitMapS)", - BM_LOCKED_TEST_ALLOWED); - - /* Lost contact to peer's copy of the data */ - if ((os.pdsk >= D_INCONSISTENT && - os.pdsk != D_UNKNOWN && - os.pdsk != D_OUTDATED) - && (ns.pdsk < D_INCONSISTENT || - ns.pdsk == D_UNKNOWN || - ns.pdsk == D_OUTDATED)) { - if (get_ldev(mdev)) { - if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) && - mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) { - if (is_susp(mdev->state)) { - set_bit(NEW_CUR_UUID, &mdev->flags); - } else { - drbd_uuid_new_current(mdev); - drbd_send_uuids(mdev); - } - } - put_ldev(mdev); - } - } - - if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) { - if (os.peer == R_SECONDARY && ns.peer == R_PRIMARY && - mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) { - drbd_uuid_new_current(mdev); - drbd_send_uuids(mdev); - } - /* D_DISKLESS Peer becomes secondary */ - if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY) - /* We may still be Primary ourselves. - * No harm done if the bitmap still changes, - * redirtied pages will follow later. */ - drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, - "demote diskless peer", BM_LOCKED_SET_ALLOWED); - put_ldev(mdev); - } - - /* Write out all changed bits on demote. - * Though, no need to da that just yet - * if there is a resync going on still */ - if (os.role == R_PRIMARY && ns.role == R_SECONDARY && - mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) { - /* No changes to the bitmap expected this time, so assert that, - * even though no harm was done if it did change. */ - drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, - "demote", BM_LOCKED_TEST_ALLOWED); - put_ldev(mdev); - } - - /* Last part of the attaching process ... */ - if (ns.conn >= C_CONNECTED && - os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) { - drbd_send_sizes(mdev, 0, 0); /* to start sync... */ - drbd_send_uuids(mdev); - drbd_send_state(mdev, ns); - } - - /* We want to pause/continue resync, tell peer. */ - if (ns.conn >= C_CONNECTED && - ((os.aftr_isp != ns.aftr_isp) || - (os.user_isp != ns.user_isp))) - drbd_send_state(mdev, ns); - - /* In case one of the isp bits got set, suspend other devices. */ - if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) && - (ns.aftr_isp || ns.peer_isp || ns.user_isp)) - suspend_other_sg(mdev); - - /* Make sure the peer gets informed about eventual state - changes (ISP bits) while we were in WFReportParams. */ - if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED) - drbd_send_state(mdev, ns); - - if (os.conn != C_AHEAD && ns.conn == C_AHEAD) - drbd_send_state(mdev, ns); - - /* We are in the progress to start a full sync... */ - if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) || - (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S)) - /* no other bitmap changes expected during this phase */ - drbd_queue_bitmap_io(mdev, - &drbd_bmio_set_n_write, &abw_start_sync, - "set_n_write from StartingSync", BM_LOCKED_TEST_ALLOWED); - - /* We are invalidating our self... */ - if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED && - os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT) - /* other bitmap operation expected during this phase */ - drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, - "set_n_write from invalidate", BM_LOCKED_MASK); - - /* first half of local IO error, failure to attach, - * or administrative detach */ - if (os.disk != D_FAILED && ns.disk == D_FAILED) { - enum drbd_io_error_p eh = EP_PASS_ON; - int was_io_error = 0; - /* corresponding get_ldev was in __drbd_set_state, to serialize - * our cleanup here with the transition to D_DISKLESS. - * But is is still not save to dreference ldev here, since - * we might come from an failed Attach before ldev was set. */ - if (mdev->ldev) { - eh = mdev->ldev->dc.on_io_error; - was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags); - - if (was_io_error && eh == EP_CALL_HELPER) - drbd_khelper(mdev, "local-io-error"); - - /* Immediately allow completion of all application IO, - * that waits for completion from the local disk, - * if this was a force-detach due to disk_timeout - * or administrator request (drbdsetup detach --force). - * Do NOT abort otherwise. - * Aborting local requests may cause serious problems, - * if requests are completed to upper layers already, - * and then later the already submitted local bio completes. - * This can cause DMA into former bio pages that meanwhile - * have been re-used for other things. - * So aborting local requests may cause crashes, - * or even worse, silent data corruption. - */ - if (test_and_clear_bit(FORCE_DETACH, &mdev->flags)) - tl_abort_disk_io(mdev); - - /* current state still has to be D_FAILED, - * there is only one way out: to D_DISKLESS, - * and that may only happen after our put_ldev below. */ - if (mdev->state.disk != D_FAILED) - dev_err(DEV, - "ASSERT FAILED: disk is %s during detach\n", - drbd_disk_str(mdev->state.disk)); - - if (ns.conn >= C_CONNECTED) - drbd_send_state(mdev, ns); - - drbd_rs_cancel_all(mdev); - - /* In case we want to get something to stable storage still, - * this may be the last chance. - * Following put_ldev may transition to D_DISKLESS. */ - drbd_md_sync(mdev); - } - put_ldev(mdev); - } - - /* second half of local IO error, failure to attach, - * or administrative detach, - * after local_cnt references have reached zero again */ - if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) { - /* We must still be diskless, - * re-attach has to be serialized with this! */ - if (mdev->state.disk != D_DISKLESS) - dev_err(DEV, - "ASSERT FAILED: disk is %s while going diskless\n", - drbd_disk_str(mdev->state.disk)); - - if (ns.conn >= C_CONNECTED) - drbd_send_state(mdev, ns); - - /* corresponding get_ldev in __drbd_set_state - * this may finally trigger drbd_ldev_destroy. */ - put_ldev(mdev); - } - - /* Notify peer that I had a local IO error, and did not detached.. */ - if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT && ns.conn >= C_CONNECTED) - drbd_send_state(mdev, ns); - - /* Disks got bigger while they were detached */ - if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING && - test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) { - if (ns.conn == C_CONNECTED) - resync_after_online_grow(mdev); - } - - /* A resync finished or aborted, wake paused devices... */ - if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) || - (os.peer_isp && !ns.peer_isp) || - (os.user_isp && !ns.user_isp)) - resume_next_sg(mdev); - - /* sync target done with resync. Explicitly notify peer, even though - * it should (at least for non-empty resyncs) already know itself. */ - if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED) - drbd_send_state(mdev, ns); - - /* Wake up role changes, that were delayed because of connection establishing */ - if (os.conn == C_WF_REPORT_PARAMS && ns.conn != C_WF_REPORT_PARAMS) { - clear_bit(STATE_SENT, &mdev->flags); - wake_up(&mdev->state_wait); - } - - /* This triggers bitmap writeout of potentially still unwritten pages - * if the resync finished cleanly, or aborted because of peer disk - * failure, or because of connection loss. - * For resync aborted because of local disk failure, we cannot do - * any bitmap writeout anymore. - * No harm done if some bits change during this phase. - */ - if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(mdev)) { - drbd_queue_bitmap_io(mdev, &drbd_bm_write_copy_pages, NULL, - "write from resync_finished", BM_LOCKED_CHANGE_ALLOWED); - put_ldev(mdev); - } - - /* free tl_hash if we Got thawed and are C_STANDALONE */ - if (ns.conn == C_STANDALONE && !is_susp(ns) && mdev->tl_hash) - drbd_free_tl_hash(mdev); - - /* Upon network connection, we need to start the receiver */ - if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED) - drbd_thread_start(&mdev->receiver); - - /* Terminate worker thread if we are unconfigured - it will be - restarted as needed... */ - if (ns.disk == D_DISKLESS && - ns.conn == C_STANDALONE && - ns.role == R_SECONDARY) { - if (os.aftr_isp != ns.aftr_isp) - resume_next_sg(mdev); - /* set in __drbd_set_state, unless CONFIG_PENDING was set */ - if (test_bit(DEVICE_DYING, &mdev->flags)) - drbd_thread_stop_nowait(&mdev->worker); + if (req->w.mdev != mdev) + continue; + _req_mod(req, ABORT_DISK_IO); } - - drbd_md_sync(mdev); + spin_unlock_irq(&tconn->req_lock); } - static int drbd_thread_setup(void *arg) { struct drbd_thread *thi = (struct drbd_thread *) arg; - struct drbd_conf *mdev = thi->mdev; + struct drbd_tconn *tconn = thi->tconn; unsigned long flags; int retval; + snprintf(current->comm, sizeof(current->comm), "drbd_%c_%s", + thi->name[0], thi->tconn->name); + restart: retval = thi->function(thi); spin_lock_irqsave(&thi->t_lock, flags); - /* if the receiver has been "Exiting", the last thing it did + /* if the receiver has been "EXITING", the last thing it did * was set the conn state to "StandAlone", * if now a re-connect request comes in, conn state goes C_UNCONNECTED, * and receiver thread will be "started". - * drbd_thread_start needs to set "Restarting" in that case. + * drbd_thread_start needs to set "RESTARTING" in that case. * t_state check and assignment needs to be within the same spinlock, - * so either thread_start sees Exiting, and can remap to Restarting, - * or thread_start see None, and can proceed as normal. + * so either thread_start sees EXITING, and can remap to RESTARTING, + * or thread_start see NONE, and can proceed as normal. */ - if (thi->t_state == Restarting) { - dev_info(DEV, "Restarting %s\n", current->comm); - thi->t_state = Running; + if (thi->t_state == RESTARTING) { + conn_info(tconn, "Restarting %s thread\n", thi->name); + thi->t_state = RUNNING; spin_unlock_irqrestore(&thi->t_lock, flags); goto restart; } thi->task = NULL; - thi->t_state = None; + thi->t_state = NONE; smp_mb(); - complete(&thi->stop); + complete_all(&thi->stop); spin_unlock_irqrestore(&thi->t_lock, flags); - dev_info(DEV, "Terminating %s\n", current->comm); + conn_info(tconn, "Terminating %s\n", current->comm); /* Release mod reference taken when thread was started */ + + kref_put(&tconn->kref, &conn_destroy); module_put(THIS_MODULE); return retval; } -static void drbd_thread_init(struct drbd_conf *mdev, struct drbd_thread *thi, - int (*func) (struct drbd_thread *)) +static void drbd_thread_init(struct drbd_tconn *tconn, struct drbd_thread *thi, + int (*func) (struct drbd_thread *), char *name) { spin_lock_init(&thi->t_lock); thi->task = NULL; - thi->t_state = None; + thi->t_state = NONE; thi->function = func; - thi->mdev = mdev; + thi->tconn = tconn; + strncpy(thi->name, name, ARRAY_SIZE(thi->name)); } int drbd_thread_start(struct drbd_thread *thi) { - struct drbd_conf *mdev = thi->mdev; + struct drbd_tconn *tconn = thi->tconn; struct task_struct *nt; unsigned long flags; - const char *me = - thi == &mdev->receiver ? "receiver" : - thi == &mdev->asender ? "asender" : - thi == &mdev->worker ? "worker" : "NONSENSE"; - /* is used from state engine doing drbd_thread_stop_nowait, * while holding the req lock irqsave */ spin_lock_irqsave(&thi->t_lock, flags); switch (thi->t_state) { - case None: - dev_info(DEV, "Starting %s thread (from %s [%d])\n", - me, current->comm, current->pid); + case NONE: + conn_info(tconn, "Starting %s thread (from %s [%d])\n", + thi->name, current->comm, current->pid); /* Get ref on module for thread - this is released when thread exits */ if (!try_module_get(THIS_MODULE)) { - dev_err(DEV, "Failed to get module reference in drbd_thread_start\n"); + conn_err(tconn, "Failed to get module reference in drbd_thread_start\n"); spin_unlock_irqrestore(&thi->t_lock, flags); return false; } + kref_get(&thi->tconn->kref); + init_completion(&thi->stop); - D_ASSERT(thi->task == NULL); thi->reset_cpu_mask = 1; - thi->t_state = Running; + thi->t_state = RUNNING; spin_unlock_irqrestore(&thi->t_lock, flags); flush_signals(current); /* otherw. may get -ERESTARTNOINTR */ nt = kthread_create(drbd_thread_setup, (void *) thi, - "drbd%d_%s", mdev_to_minor(mdev), me); + "drbd_%c_%s", thi->name[0], thi->tconn->name); if (IS_ERR(nt)) { - dev_err(DEV, "Couldn't start thread\n"); + conn_err(tconn, "Couldn't start thread\n"); + kref_put(&tconn->kref, &conn_destroy); module_put(THIS_MODULE); return false; } spin_lock_irqsave(&thi->t_lock, flags); thi->task = nt; - thi->t_state = Running; + thi->t_state = RUNNING; spin_unlock_irqrestore(&thi->t_lock, flags); wake_up_process(nt); break; - case Exiting: - thi->t_state = Restarting; - dev_info(DEV, "Restarting %s thread (from %s [%d])\n", - me, current->comm, current->pid); + case EXITING: + thi->t_state = RESTARTING; + conn_info(tconn, "Restarting %s thread (from %s [%d])\n", + thi->name, current->comm, current->pid); /* fall through */ - case Running: - case Restarting: + case RUNNING: + case RESTARTING: default: spin_unlock_irqrestore(&thi->t_lock, flags); break; @@ -1867,12 +447,12 @@ void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait) { unsigned long flags; - enum drbd_thread_state ns = restart ? Restarting : Exiting; + enum drbd_thread_state ns = restart ? RESTARTING : EXITING; /* may be called from state engine, holding the req lock irqsave */ spin_lock_irqsave(&thi->t_lock, flags); - if (thi->t_state == None) { + if (thi->t_state == NONE) { spin_unlock_irqrestore(&thi->t_lock, flags); if (restart) drbd_thread_start(thi); @@ -1890,7 +470,6 @@ void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait) init_completion(&thi->stop); if (thi->task != current) force_sig(DRBD_SIGKILL, thi->task); - } spin_unlock_irqrestore(&thi->t_lock, flags); @@ -1899,6 +478,35 @@ void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait) wait_for_completion(&thi->stop); } +static struct drbd_thread *drbd_task_to_thread(struct drbd_tconn *tconn, struct task_struct *task) +{ + struct drbd_thread *thi = + task == tconn->receiver.task ? &tconn->receiver : + task == tconn->asender.task ? &tconn->asender : + task == tconn->worker.task ? &tconn->worker : NULL; + + return thi; +} + +char *drbd_task_to_thread_name(struct drbd_tconn *tconn, struct task_struct *task) +{ + struct drbd_thread *thi = drbd_task_to_thread(tconn, task); + return thi ? thi->name : task->comm; +} + +int conn_lowest_minor(struct drbd_tconn *tconn) +{ + struct drbd_conf *mdev; + int vnr = 0, m; + + rcu_read_lock(); + mdev = idr_get_next(&tconn->volumes, &vnr); + m = mdev ? mdev_to_minor(mdev) : -1; + rcu_read_unlock(); + + return m; +} + #ifdef CONFIG_SMP /** * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs @@ -1907,238 +515,345 @@ void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait) * Forces all threads of a device onto the same CPU. This is beneficial for * DRBD's performance. May be overwritten by user's configuration. */ -void drbd_calc_cpu_mask(struct drbd_conf *mdev) +void drbd_calc_cpu_mask(struct drbd_tconn *tconn) { int ord, cpu; /* user override. */ - if (cpumask_weight(mdev->cpu_mask)) + if (cpumask_weight(tconn->cpu_mask)) return; - ord = mdev_to_minor(mdev) % cpumask_weight(cpu_online_mask); + ord = conn_lowest_minor(tconn) % cpumask_weight(cpu_online_mask); for_each_online_cpu(cpu) { if (ord-- == 0) { - cpumask_set_cpu(cpu, mdev->cpu_mask); + cpumask_set_cpu(cpu, tconn->cpu_mask); return; } } /* should not be reached */ - cpumask_setall(mdev->cpu_mask); + cpumask_setall(tconn->cpu_mask); } /** * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread * @mdev: DRBD device. + * @thi: drbd_thread object * * call in the "main loop" of _all_ threads, no need for any mutex, current won't die * prematurely. */ -void drbd_thread_current_set_cpu(struct drbd_conf *mdev) +void drbd_thread_current_set_cpu(struct drbd_thread *thi) { struct task_struct *p = current; - struct drbd_thread *thi = - p == mdev->asender.task ? &mdev->asender : - p == mdev->receiver.task ? &mdev->receiver : - p == mdev->worker.task ? &mdev->worker : - NULL; - ERR_IF(thi == NULL) - return; + if (!thi->reset_cpu_mask) return; thi->reset_cpu_mask = 0; - set_cpus_allowed_ptr(p, mdev->cpu_mask); + set_cpus_allowed_ptr(p, thi->tconn->cpu_mask); } #endif -/* the appropriate socket mutex must be held already */ -int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock, - enum drbd_packets cmd, struct p_header80 *h, - size_t size, unsigned msg_flags) +/** + * drbd_header_size - size of a packet header + * + * The header size is a multiple of 8, so any payload following the header is + * word aligned on 64-bit architectures. (The bitmap send and receive code + * relies on this.) + */ +unsigned int drbd_header_size(struct drbd_tconn *tconn) { - int sent, ok; + if (tconn->agreed_pro_version >= 100) { + BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100), 8)); + return sizeof(struct p_header100); + } else { + BUILD_BUG_ON(sizeof(struct p_header80) != + sizeof(struct p_header95)); + BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80), 8)); + return sizeof(struct p_header80); + } +} - ERR_IF(!h) return false; - ERR_IF(!size) return false; +static unsigned int prepare_header80(struct p_header80 *h, enum drbd_packet cmd, int size) +{ + h->magic = cpu_to_be32(DRBD_MAGIC); + h->command = cpu_to_be16(cmd); + h->length = cpu_to_be16(size); + return sizeof(struct p_header80); +} - h->magic = BE_DRBD_MAGIC; +static unsigned int prepare_header95(struct p_header95 *h, enum drbd_packet cmd, int size) +{ + h->magic = cpu_to_be16(DRBD_MAGIC_BIG); h->command = cpu_to_be16(cmd); - h->length = cpu_to_be16(size-sizeof(struct p_header80)); + h->length = cpu_to_be32(size); + return sizeof(struct p_header95); +} - sent = drbd_send(mdev, sock, h, size, msg_flags); +static unsigned int prepare_header100(struct p_header100 *h, enum drbd_packet cmd, + int size, int vnr) +{ + h->magic = cpu_to_be32(DRBD_MAGIC_100); + h->volume = cpu_to_be16(vnr); + h->command = cpu_to_be16(cmd); + h->length = cpu_to_be32(size); + h->pad = 0; + return sizeof(struct p_header100); +} - ok = (sent == size); - if (!ok && !signal_pending(current)) - dev_warn(DEV, "short sent %s size=%d sent=%d\n", - cmdname(cmd), (int)size, sent); - return ok; +static unsigned int prepare_header(struct drbd_tconn *tconn, int vnr, + void *buffer, enum drbd_packet cmd, int size) +{ + if (tconn->agreed_pro_version >= 100) + return prepare_header100(buffer, cmd, size, vnr); + else if (tconn->agreed_pro_version >= 95 && + size > DRBD_MAX_SIZE_H80_PACKET) + return prepare_header95(buffer, cmd, size); + else + return prepare_header80(buffer, cmd, size); } -/* don't pass the socket. we may only look at it - * when we hold the appropriate socket mutex. - */ -int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket, - enum drbd_packets cmd, struct p_header80 *h, size_t size) +static void *__conn_prepare_command(struct drbd_tconn *tconn, + struct drbd_socket *sock) { - int ok = 0; - struct socket *sock; + if (!sock->socket) + return NULL; + return sock->sbuf + drbd_header_size(tconn); +} - if (use_data_socket) { - mutex_lock(&mdev->data.mutex); - sock = mdev->data.socket; - } else { - mutex_lock(&mdev->meta.mutex); - sock = mdev->meta.socket; - } +void *conn_prepare_command(struct drbd_tconn *tconn, struct drbd_socket *sock) +{ + void *p; - /* drbd_disconnect() could have called drbd_free_sock() - * while we were waiting in down()... */ - if (likely(sock != NULL)) - ok = _drbd_send_cmd(mdev, sock, cmd, h, size, 0); + mutex_lock(&sock->mutex); + p = __conn_prepare_command(tconn, sock); + if (!p) + mutex_unlock(&sock->mutex); - if (use_data_socket) - mutex_unlock(&mdev->data.mutex); - else - mutex_unlock(&mdev->meta.mutex); - return ok; + return p; } -int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, char *data, - size_t size) +void *drbd_prepare_command(struct drbd_conf *mdev, struct drbd_socket *sock) { - struct p_header80 h; - int ok; + return conn_prepare_command(mdev->tconn, sock); +} - h.magic = BE_DRBD_MAGIC; - h.command = cpu_to_be16(cmd); - h.length = cpu_to_be16(size); +static int __send_command(struct drbd_tconn *tconn, int vnr, + struct drbd_socket *sock, enum drbd_packet cmd, + unsigned int header_size, void *data, + unsigned int size) +{ + int msg_flags; + int err; - if (!drbd_get_data_sock(mdev)) - return 0; + /* + * Called with @data == NULL and the size of the data blocks in @size + * for commands that send data blocks. For those commands, omit the + * MSG_MORE flag: this will increase the likelihood that data blocks + * which are page aligned on the sender will end up page aligned on the + * receiver. + */ + msg_flags = data ? MSG_MORE : 0; + + header_size += prepare_header(tconn, vnr, sock->sbuf, cmd, + header_size + size); + err = drbd_send_all(tconn, sock->socket, sock->sbuf, header_size, + msg_flags); + if (data && !err) + err = drbd_send_all(tconn, sock->socket, data, size, 0); + return err; +} - ok = (sizeof(h) == - drbd_send(mdev, mdev->data.socket, &h, sizeof(h), 0)); - ok = ok && (size == - drbd_send(mdev, mdev->data.socket, data, size, 0)); +static int __conn_send_command(struct drbd_tconn *tconn, struct drbd_socket *sock, + enum drbd_packet cmd, unsigned int header_size, + void *data, unsigned int size) +{ + return __send_command(tconn, 0, sock, cmd, header_size, data, size); +} - drbd_put_data_sock(mdev); +int conn_send_command(struct drbd_tconn *tconn, struct drbd_socket *sock, + enum drbd_packet cmd, unsigned int header_size, + void *data, unsigned int size) +{ + int err; - return ok; + err = __conn_send_command(tconn, sock, cmd, header_size, data, size); + mutex_unlock(&sock->mutex); + return err; } -int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc) +int drbd_send_command(struct drbd_conf *mdev, struct drbd_socket *sock, + enum drbd_packet cmd, unsigned int header_size, + void *data, unsigned int size) { + int err; + + err = __send_command(mdev->tconn, mdev->vnr, sock, cmd, header_size, + data, size); + mutex_unlock(&sock->mutex); + return err; +} + +int drbd_send_ping(struct drbd_tconn *tconn) +{ + struct drbd_socket *sock; + + sock = &tconn->meta; + if (!conn_prepare_command(tconn, sock)) + return -EIO; + return conn_send_command(tconn, sock, P_PING, 0, NULL, 0); +} + +int drbd_send_ping_ack(struct drbd_tconn *tconn) +{ + struct drbd_socket *sock; + + sock = &tconn->meta; + if (!conn_prepare_command(tconn, sock)) + return -EIO; + return conn_send_command(tconn, sock, P_PING_ACK, 0, NULL, 0); +} + +int drbd_send_sync_param(struct drbd_conf *mdev) +{ + struct drbd_socket *sock; struct p_rs_param_95 *p; - struct socket *sock; - int size, rv; - const int apv = mdev->agreed_pro_version; + int size; + const int apv = mdev->tconn->agreed_pro_version; + enum drbd_packet cmd; + struct net_conf *nc; + struct disk_conf *dc; + + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + if (!p) + return -EIO; + + rcu_read_lock(); + nc = rcu_dereference(mdev->tconn->net_conf); size = apv <= 87 ? sizeof(struct p_rs_param) : apv == 88 ? sizeof(struct p_rs_param) - + strlen(mdev->sync_conf.verify_alg) + 1 + + strlen(nc->verify_alg) + 1 : apv <= 94 ? sizeof(struct p_rs_param_89) : /* apv >= 95 */ sizeof(struct p_rs_param_95); - /* used from admin command context and receiver/worker context. - * to avoid kmalloc, grab the socket right here, - * then use the pre-allocated sbuf there */ - mutex_lock(&mdev->data.mutex); - sock = mdev->data.socket; - - if (likely(sock != NULL)) { - enum drbd_packets cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM; - - p = &mdev->data.sbuf.rs_param_95; + cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM; - /* initialize verify_alg and csums_alg */ - memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); + /* initialize verify_alg and csums_alg */ + memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); - p->rate = cpu_to_be32(sc->rate); - p->c_plan_ahead = cpu_to_be32(sc->c_plan_ahead); - p->c_delay_target = cpu_to_be32(sc->c_delay_target); - p->c_fill_target = cpu_to_be32(sc->c_fill_target); - p->c_max_rate = cpu_to_be32(sc->c_max_rate); - - if (apv >= 88) - strcpy(p->verify_alg, mdev->sync_conf.verify_alg); - if (apv >= 89) - strcpy(p->csums_alg, mdev->sync_conf.csums_alg); - - rv = _drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0); - } else - rv = 0; /* not ok */ + if (get_ldev(mdev)) { + dc = rcu_dereference(mdev->ldev->disk_conf); + p->resync_rate = cpu_to_be32(dc->resync_rate); + p->c_plan_ahead = cpu_to_be32(dc->c_plan_ahead); + p->c_delay_target = cpu_to_be32(dc->c_delay_target); + p->c_fill_target = cpu_to_be32(dc->c_fill_target); + p->c_max_rate = cpu_to_be32(dc->c_max_rate); + put_ldev(mdev); + } else { + p->resync_rate = cpu_to_be32(DRBD_RESYNC_RATE_DEF); + p->c_plan_ahead = cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF); + p->c_delay_target = cpu_to_be32(DRBD_C_DELAY_TARGET_DEF); + p->c_fill_target = cpu_to_be32(DRBD_C_FILL_TARGET_DEF); + p->c_max_rate = cpu_to_be32(DRBD_C_MAX_RATE_DEF); + } - mutex_unlock(&mdev->data.mutex); + if (apv >= 88) + strcpy(p->verify_alg, nc->verify_alg); + if (apv >= 89) + strcpy(p->csums_alg, nc->csums_alg); + rcu_read_unlock(); - return rv; + return drbd_send_command(mdev, sock, cmd, size, NULL, 0); } -int drbd_send_protocol(struct drbd_conf *mdev) +int __drbd_send_protocol(struct drbd_tconn *tconn, enum drbd_packet cmd) { + struct drbd_socket *sock; struct p_protocol *p; - int size, cf, rv; + struct net_conf *nc; + int size, cf; - size = sizeof(struct p_protocol); + sock = &tconn->data; + p = __conn_prepare_command(tconn, sock); + if (!p) + return -EIO; - if (mdev->agreed_pro_version >= 87) - size += strlen(mdev->net_conf->integrity_alg) + 1; + rcu_read_lock(); + nc = rcu_dereference(tconn->net_conf); - /* we must not recurse into our own queue, - * as that is blocked during handshake */ - p = kmalloc(size, GFP_NOIO); - if (p == NULL) - return 0; + if (nc->tentative && tconn->agreed_pro_version < 92) { + rcu_read_unlock(); + mutex_unlock(&sock->mutex); + conn_err(tconn, "--dry-run is not supported by peer"); + return -EOPNOTSUPP; + } - p->protocol = cpu_to_be32(mdev->net_conf->wire_protocol); - p->after_sb_0p = cpu_to_be32(mdev->net_conf->after_sb_0p); - p->after_sb_1p = cpu_to_be32(mdev->net_conf->after_sb_1p); - p->after_sb_2p = cpu_to_be32(mdev->net_conf->after_sb_2p); - p->two_primaries = cpu_to_be32(mdev->net_conf->two_primaries); + size = sizeof(*p); + if (tconn->agreed_pro_version >= 87) + size += strlen(nc->integrity_alg) + 1; + p->protocol = cpu_to_be32(nc->wire_protocol); + p->after_sb_0p = cpu_to_be32(nc->after_sb_0p); + p->after_sb_1p = cpu_to_be32(nc->after_sb_1p); + p->after_sb_2p = cpu_to_be32(nc->after_sb_2p); + p->two_primaries = cpu_to_be32(nc->two_primaries); cf = 0; - if (mdev->net_conf->want_lose) - cf |= CF_WANT_LOSE; - if (mdev->net_conf->dry_run) { - if (mdev->agreed_pro_version >= 92) - cf |= CF_DRY_RUN; - else { - dev_err(DEV, "--dry-run is not supported by peer"); - kfree(p); - return -1; - } - } + if (nc->discard_my_data) + cf |= CF_DISCARD_MY_DATA; + if (nc->tentative) + cf |= CF_DRY_RUN; p->conn_flags = cpu_to_be32(cf); - if (mdev->agreed_pro_version >= 87) - strcpy(p->integrity_alg, mdev->net_conf->integrity_alg); + if (tconn->agreed_pro_version >= 87) + strcpy(p->integrity_alg, nc->integrity_alg); + rcu_read_unlock(); - rv = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_PROTOCOL, - (struct p_header80 *)p, size); - kfree(p); - return rv; + return __conn_send_command(tconn, sock, cmd, size, NULL, 0); +} + +int drbd_send_protocol(struct drbd_tconn *tconn) +{ + int err; + + mutex_lock(&tconn->data.mutex); + err = __drbd_send_protocol(tconn, P_PROTOCOL); + mutex_unlock(&tconn->data.mutex); + + return err; } int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags) { - struct p_uuids p; + struct drbd_socket *sock; + struct p_uuids *p; int i; if (!get_ldev_if_state(mdev, D_NEGOTIATING)) - return 1; + return 0; + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + if (!p) { + put_ldev(mdev); + return -EIO; + } + spin_lock_irq(&mdev->ldev->md.uuid_lock); for (i = UI_CURRENT; i < UI_SIZE; i++) - p.uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0; + p->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]); + spin_unlock_irq(&mdev->ldev->md.uuid_lock); mdev->comm_bm_set = drbd_bm_total_weight(mdev); - p.uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set); - uuid_flags |= mdev->net_conf->want_lose ? 1 : 0; + p->uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set); + rcu_read_lock(); + uuid_flags |= rcu_dereference(mdev->tconn->net_conf)->discard_my_data ? 1 : 0; + rcu_read_unlock(); uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0; uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0; - p.uuid[UI_FLAGS] = cpu_to_be64(uuid_flags); + p->uuid[UI_FLAGS] = cpu_to_be64(uuid_flags); put_ldev(mdev); - - return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_UUIDS, - (struct p_header80 *)&p, sizeof(p)); + return drbd_send_command(mdev, sock, P_UUIDS, sizeof(*p), NULL, 0); } int drbd_send_uuids(struct drbd_conf *mdev) @@ -2169,9 +884,10 @@ void drbd_print_uuids(struct drbd_conf *mdev, const char *text) } } -int drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev) +void drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev) { - struct p_rs_uuid p; + struct drbd_socket *sock; + struct p_rs_uuid *p; u64 uuid; D_ASSERT(mdev->state.disk == D_UP_TO_DATE); @@ -2184,24 +900,29 @@ int drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev) drbd_uuid_set(mdev, UI_BITMAP, uuid); drbd_print_uuids(mdev, "updated sync UUID"); drbd_md_sync(mdev); - p.uuid = cpu_to_be64(uuid); - return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SYNC_UUID, - (struct p_header80 *)&p, sizeof(p)); + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + if (p) { + p->uuid = cpu_to_be64(uuid); + drbd_send_command(mdev, sock, P_SYNC_UUID, sizeof(*p), NULL, 0); + } } int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags) { - struct p_sizes p; + struct drbd_socket *sock; + struct p_sizes *p; sector_t d_size, u_size; int q_order_type; unsigned int max_bio_size; - int ok; if (get_ldev_if_state(mdev, D_NEGOTIATING)) { D_ASSERT(mdev->ldev->backing_bdev); d_size = drbd_get_max_capacity(mdev->ldev); - u_size = mdev->ldev->dc.disk_size; + rcu_read_lock(); + u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size; + rcu_read_unlock(); q_order_type = drbd_queue_order_type(mdev); max_bio_size = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9; max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE); @@ -2213,20 +934,23 @@ int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags fl max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */ } - /* Never allow old drbd (up to 8.3.7) to see more than 32KiB */ - if (mdev->agreed_pro_version <= 94) - max_bio_size = min(max_bio_size, DRBD_MAX_SIZE_H80_PACKET); + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + if (!p) + return -EIO; - p.d_size = cpu_to_be64(d_size); - p.u_size = cpu_to_be64(u_size); - p.c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev)); - p.max_bio_size = cpu_to_be32(max_bio_size); - p.queue_order_type = cpu_to_be16(q_order_type); - p.dds_flags = cpu_to_be16(flags); + if (mdev->tconn->agreed_pro_version <= 94) + max_bio_size = min(max_bio_size, DRBD_MAX_SIZE_H80_PACKET); + else if (mdev->tconn->agreed_pro_version < 100) + max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE_P95); - ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SIZES, - (struct p_header80 *)&p, sizeof(p)); - return ok; + p->d_size = cpu_to_be64(d_size); + p->u_size = cpu_to_be64(u_size); + p->c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev)); + p->max_bio_size = cpu_to_be32(max_bio_size); + p->queue_order_type = cpu_to_be16(q_order_type); + p->dds_flags = cpu_to_be16(flags); + return drbd_send_command(mdev, sock, P_SIZES, sizeof(*p), NULL, 0); } /** @@ -2235,34 +959,21 @@ int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags fl */ int drbd_send_current_state(struct drbd_conf *mdev) { - struct socket *sock; - struct p_state p; - int ok = 0; - - /* Grab state lock so we wont send state if we're in the middle - * of a cluster wide state change on another thread */ - drbd_state_lock(mdev); - - mutex_lock(&mdev->data.mutex); - - p.state = cpu_to_be32(mdev->state.i); /* Within the send mutex */ - sock = mdev->data.socket; + struct drbd_socket *sock; + struct p_state *p; - if (likely(sock != NULL)) { - ok = _drbd_send_cmd(mdev, sock, P_STATE, - (struct p_header80 *)&p, sizeof(p), 0); - } - - mutex_unlock(&mdev->data.mutex); - - drbd_state_unlock(mdev); - return ok; + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + if (!p) + return -EIO; + p->state = cpu_to_be32(mdev->state.i); /* Within the send mutex */ + return drbd_send_command(mdev, sock, P_STATE, sizeof(*p), NULL, 0); } /** * drbd_send_state() - After a state change, sends the new state to the peer - * @mdev: DRBD device. - * @state: the state to send, not necessarily the current state. + * @mdev: DRBD device. + * @state: the state to send, not necessarily the current state. * * Each state change queues an "after_state_ch" work, which will eventually * send the resulting new state to the peer. If more state changes happen @@ -2271,50 +982,95 @@ int drbd_send_current_state(struct drbd_conf *mdev) */ int drbd_send_state(struct drbd_conf *mdev, union drbd_state state) { - struct socket *sock; - struct p_state p; - int ok = 0; + struct drbd_socket *sock; + struct p_state *p; - mutex_lock(&mdev->data.mutex); + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + if (!p) + return -EIO; + p->state = cpu_to_be32(state.i); /* Within the send mutex */ + return drbd_send_command(mdev, sock, P_STATE, sizeof(*p), NULL, 0); +} - p.state = cpu_to_be32(state.i); - sock = mdev->data.socket; +int drbd_send_state_req(struct drbd_conf *mdev, union drbd_state mask, union drbd_state val) +{ + struct drbd_socket *sock; + struct p_req_state *p; - if (likely(sock != NULL)) { - ok = _drbd_send_cmd(mdev, sock, P_STATE, - (struct p_header80 *)&p, sizeof(p), 0); - } + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + if (!p) + return -EIO; + p->mask = cpu_to_be32(mask.i); + p->val = cpu_to_be32(val.i); + return drbd_send_command(mdev, sock, P_STATE_CHG_REQ, sizeof(*p), NULL, 0); +} - mutex_unlock(&mdev->data.mutex); +int conn_send_state_req(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val) +{ + enum drbd_packet cmd; + struct drbd_socket *sock; + struct p_req_state *p; - return ok; + cmd = tconn->agreed_pro_version < 100 ? P_STATE_CHG_REQ : P_CONN_ST_CHG_REQ; + sock = &tconn->data; + p = conn_prepare_command(tconn, sock); + if (!p) + return -EIO; + p->mask = cpu_to_be32(mask.i); + p->val = cpu_to_be32(val.i); + return conn_send_command(tconn, sock, cmd, sizeof(*p), NULL, 0); } -int drbd_send_state_req(struct drbd_conf *mdev, - union drbd_state mask, union drbd_state val) +void drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode) { - struct p_req_state p; + struct drbd_socket *sock; + struct p_req_state_reply *p; - p.mask = cpu_to_be32(mask.i); - p.val = cpu_to_be32(val.i); + sock = &mdev->tconn->meta; + p = drbd_prepare_command(mdev, sock); + if (p) { + p->retcode = cpu_to_be32(retcode); + drbd_send_command(mdev, sock, P_STATE_CHG_REPLY, sizeof(*p), NULL, 0); + } +} + +void conn_send_sr_reply(struct drbd_tconn *tconn, enum drbd_state_rv retcode) +{ + struct drbd_socket *sock; + struct p_req_state_reply *p; + enum drbd_packet cmd = tconn->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : P_CONN_ST_CHG_REPLY; - return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_STATE_CHG_REQ, - (struct p_header80 *)&p, sizeof(p)); + sock = &tconn->meta; + p = conn_prepare_command(tconn, sock); + if (p) { + p->retcode = cpu_to_be32(retcode); + conn_send_command(tconn, sock, cmd, sizeof(*p), NULL, 0); + } } -int drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode) +static void dcbp_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code) { - struct p_req_state_reply p; + BUG_ON(code & ~0xf); + p->encoding = (p->encoding & ~0xf) | code; +} - p.retcode = cpu_to_be32(retcode); +static void dcbp_set_start(struct p_compressed_bm *p, int set) +{ + p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0); +} - return drbd_send_cmd(mdev, USE_META_SOCKET, P_STATE_CHG_REPLY, - (struct p_header80 *)&p, sizeof(p)); +static void dcbp_set_pad_bits(struct p_compressed_bm *p, int n) +{ + BUG_ON(n & ~0x7); + p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4); } int fill_bitmap_rle_bits(struct drbd_conf *mdev, - struct p_compressed_bm *p, - struct bm_xfer_ctx *c) + struct p_compressed_bm *p, + unsigned int size, + struct bm_xfer_ctx *c) { struct bitstream bs; unsigned long plain_bits; @@ -2322,19 +1078,21 @@ int fill_bitmap_rle_bits(struct drbd_conf *mdev, unsigned long rl; unsigned len; unsigned toggle; - int bits; + int bits, use_rle; /* may we use this feature? */ - if ((mdev->sync_conf.use_rle == 0) || - (mdev->agreed_pro_version < 90)) - return 0; + rcu_read_lock(); + use_rle = rcu_dereference(mdev->tconn->net_conf)->use_rle; + rcu_read_unlock(); + if (!use_rle || mdev->tconn->agreed_pro_version < 90) + return 0; if (c->bit_offset >= c->bm_bits) return 0; /* nothing to do. */ /* use at most thus many bytes */ - bitstream_init(&bs, p->code, BM_PACKET_VLI_BYTES_MAX, 0); - memset(p->code, 0, BM_PACKET_VLI_BYTES_MAX); + bitstream_init(&bs, p->code, size, 0); + memset(p->code, 0, size); /* plain bits covered in this code string */ plain_bits = 0; @@ -2356,12 +1114,12 @@ int fill_bitmap_rle_bits(struct drbd_conf *mdev, if (rl == 0) { /* the first checked bit was set, * store start value, */ - DCBP_set_start(p, 1); + dcbp_set_start(p, 1); /* but skip encoding of zero run length */ toggle = !toggle; continue; } - DCBP_set_start(p, 0); + dcbp_set_start(p, 0); } /* paranoia: catch zero runlength. @@ -2401,7 +1159,7 @@ int fill_bitmap_rle_bits(struct drbd_conf *mdev, bm_xfer_ctx_bit_to_word_offset(c); /* store pad_bits */ - DCBP_set_pad_bits(p, (8 - bs.cur.bit) & 0x7); + dcbp_set_pad_bits(p, (8 - bs.cur.bit) & 0x7); return len; } @@ -2413,48 +1171,52 @@ int fill_bitmap_rle_bits(struct drbd_conf *mdev, * code upon failure. */ static int -send_bitmap_rle_or_plain(struct drbd_conf *mdev, - struct p_header80 *h, struct bm_xfer_ctx *c) +send_bitmap_rle_or_plain(struct drbd_conf *mdev, struct bm_xfer_ctx *c) { - struct p_compressed_bm *p = (void*)h; - unsigned long num_words; - int len; - int ok; - - len = fill_bitmap_rle_bits(mdev, p, c); + struct drbd_socket *sock = &mdev->tconn->data; + unsigned int header_size = drbd_header_size(mdev->tconn); + struct p_compressed_bm *p = sock->sbuf + header_size; + int len, err; + len = fill_bitmap_rle_bits(mdev, p, + DRBD_SOCKET_BUFFER_SIZE - header_size - sizeof(*p), c); if (len < 0) return -EIO; if (len) { - DCBP_set_code(p, RLE_VLI_Bits); - ok = _drbd_send_cmd(mdev, mdev->data.socket, P_COMPRESSED_BITMAP, h, - sizeof(*p) + len, 0); - + dcbp_set_code(p, RLE_VLI_Bits); + err = __send_command(mdev->tconn, mdev->vnr, sock, + P_COMPRESSED_BITMAP, sizeof(*p) + len, + NULL, 0); c->packets[0]++; - c->bytes[0] += sizeof(*p) + len; + c->bytes[0] += header_size + sizeof(*p) + len; if (c->bit_offset >= c->bm_bits) len = 0; /* DONE */ } else { /* was not compressible. * send a buffer full of plain text bits instead. */ - num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); - len = num_words * sizeof(long); + unsigned int data_size; + unsigned long num_words; + unsigned long *p = sock->sbuf + header_size; + + data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; + num_words = min_t(size_t, data_size / sizeof(*p), + c->bm_words - c->word_offset); + len = num_words * sizeof(*p); if (len) - drbd_bm_get_lel(mdev, c->word_offset, num_words, (unsigned long*)h->payload); - ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BITMAP, - h, sizeof(struct p_header80) + len, 0); + drbd_bm_get_lel(mdev, c->word_offset, num_words, p); + err = __send_command(mdev->tconn, mdev->vnr, sock, P_BITMAP, len, NULL, 0); c->word_offset += num_words; c->bit_offset = c->word_offset * BITS_PER_LONG; c->packets[1]++; - c->bytes[1] += sizeof(struct p_header80) + len; + c->bytes[1] += header_size + len; if (c->bit_offset > c->bm_bits) c->bit_offset = c->bm_bits; } - if (ok) { + if (!err) { if (len == 0) { INFO_bm_xfer_stats(mdev, "send", c); return 0; @@ -2465,21 +1227,13 @@ send_bitmap_rle_or_plain(struct drbd_conf *mdev, } /* See the comment at receive_bitmap() */ -int _drbd_send_bitmap(struct drbd_conf *mdev) +static int _drbd_send_bitmap(struct drbd_conf *mdev) { struct bm_xfer_ctx c; - struct p_header80 *p; int err; - ERR_IF(!mdev->bitmap) return false; - - /* maybe we should use some per thread scratch page, - * and allocate that during initial device creation? */ - p = (struct p_header80 *) __get_free_page(GFP_NOIO); - if (!p) { - dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); + if (!expect(mdev->bitmap)) return false; - } if (get_ldev(mdev)) { if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { @@ -2504,37 +1258,39 @@ int _drbd_send_bitmap(struct drbd_conf *mdev) }; do { - err = send_bitmap_rle_or_plain(mdev, p, &c); + err = send_bitmap_rle_or_plain(mdev, &c); } while (err > 0); - free_page((unsigned long) p); return err == 0; } int drbd_send_bitmap(struct drbd_conf *mdev) { - int err; + struct drbd_socket *sock = &mdev->tconn->data; + int err = -1; - if (!drbd_get_data_sock(mdev)) - return -1; - err = !_drbd_send_bitmap(mdev); - drbd_put_data_sock(mdev); + mutex_lock(&sock->mutex); + if (sock->socket) + err = !_drbd_send_bitmap(mdev); + mutex_unlock(&sock->mutex); return err; } -int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size) +void drbd_send_b_ack(struct drbd_tconn *tconn, u32 barrier_nr, u32 set_size) { - int ok; - struct p_barrier_ack p; + struct drbd_socket *sock; + struct p_barrier_ack *p; - p.barrier = barrier_nr; - p.set_size = cpu_to_be32(set_size); + if (tconn->cstate < C_WF_REPORT_PARAMS) + return; - if (mdev->state.conn < C_CONNECTED) - return false; - ok = drbd_send_cmd(mdev, USE_META_SOCKET, P_BARRIER_ACK, - (struct p_header80 *)&p, sizeof(p)); - return ok; + sock = &tconn->meta; + p = conn_prepare_command(tconn, sock); + if (!p) + return; + p->barrier = barrier_nr; + p->set_size = cpu_to_be32(set_size); + conn_send_command(tconn, sock, P_BARRIER_ACK, sizeof(*p), NULL, 0); } /** @@ -2545,62 +1301,62 @@ int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size) * @blksize: size in byte, needs to be in big endian byte order * @block_id: Id, big endian byte order */ -static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packets cmd, - u64 sector, - u32 blksize, - u64 block_id) +static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packet cmd, + u64 sector, u32 blksize, u64 block_id) { - int ok; - struct p_block_ack p; + struct drbd_socket *sock; + struct p_block_ack *p; - p.sector = sector; - p.block_id = block_id; - p.blksize = blksize; - p.seq_num = cpu_to_be32(atomic_add_return(1, &mdev->packet_seq)); + if (mdev->state.conn < C_CONNECTED) + return -EIO; - if (!mdev->meta.socket || mdev->state.conn < C_CONNECTED) - return false; - ok = drbd_send_cmd(mdev, USE_META_SOCKET, cmd, - (struct p_header80 *)&p, sizeof(p)); - return ok; + sock = &mdev->tconn->meta; + p = drbd_prepare_command(mdev, sock); + if (!p) + return -EIO; + p->sector = sector; + p->block_id = block_id; + p->blksize = blksize; + p->seq_num = cpu_to_be32(atomic_inc_return(&mdev->packet_seq)); + return drbd_send_command(mdev, sock, cmd, sizeof(*p), NULL, 0); } /* dp->sector and dp->block_id already/still in network byte order, * data_size is payload size according to dp->head, * and may need to be corrected for digest size. */ -int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packets cmd, - struct p_data *dp, int data_size) +void drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packet cmd, + struct p_data *dp, int data_size) { - data_size -= (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? - crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; - return _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size), - dp->block_id); + if (mdev->tconn->peer_integrity_tfm) + data_size -= crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); + _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size), + dp->block_id); } -int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd, - struct p_block_req *rp) +void drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packet cmd, + struct p_block_req *rp) { - return _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id); + _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id); } /** * drbd_send_ack() - Sends an ack packet - * @mdev: DRBD device. - * @cmd: Packet command code. - * @e: Epoch entry. + * @mdev: DRBD device + * @cmd: packet command code + * @peer_req: peer request */ -int drbd_send_ack(struct drbd_conf *mdev, - enum drbd_packets cmd, struct drbd_epoch_entry *e) +int drbd_send_ack(struct drbd_conf *mdev, enum drbd_packet cmd, + struct drbd_peer_request *peer_req) { return _drbd_send_ack(mdev, cmd, - cpu_to_be64(e->sector), - cpu_to_be32(e->size), - e->block_id); + cpu_to_be64(peer_req->i.sector), + cpu_to_be32(peer_req->i.size), + peer_req->block_id); } /* This function misuses the block_id field to signal if the blocks * are is sync or not. */ -int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packets cmd, +int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packet cmd, sector_t sector, int blksize, u64 block_id) { return _drbd_send_ack(mdev, cmd, @@ -2612,85 +1368,87 @@ int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packets cmd, int drbd_send_drequest(struct drbd_conf *mdev, int cmd, sector_t sector, int size, u64 block_id) { - int ok; - struct p_block_req p; - - p.sector = cpu_to_be64(sector); - p.block_id = block_id; - p.blksize = cpu_to_be32(size); + struct drbd_socket *sock; + struct p_block_req *p; - ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd, - (struct p_header80 *)&p, sizeof(p)); - return ok; + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + if (!p) + return -EIO; + p->sector = cpu_to_be64(sector); + p->block_id = block_id; + p->blksize = cpu_to_be32(size); + return drbd_send_command(mdev, sock, cmd, sizeof(*p), NULL, 0); } -int drbd_send_drequest_csum(struct drbd_conf *mdev, - sector_t sector, int size, - void *digest, int digest_size, - enum drbd_packets cmd) +int drbd_send_drequest_csum(struct drbd_conf *mdev, sector_t sector, int size, + void *digest, int digest_size, enum drbd_packet cmd) { - int ok; - struct p_block_req p; - - p.sector = cpu_to_be64(sector); - p.block_id = BE_DRBD_MAGIC + 0xbeef; - p.blksize = cpu_to_be32(size); - - p.head.magic = BE_DRBD_MAGIC; - p.head.command = cpu_to_be16(cmd); - p.head.length = cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + digest_size); + struct drbd_socket *sock; + struct p_block_req *p; - mutex_lock(&mdev->data.mutex); + /* FIXME: Put the digest into the preallocated socket buffer. */ - ok = (sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), 0)); - ok = ok && (digest_size == drbd_send(mdev, mdev->data.socket, digest, digest_size, 0)); - - mutex_unlock(&mdev->data.mutex); - - return ok; + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + if (!p) + return -EIO; + p->sector = cpu_to_be64(sector); + p->block_id = ID_SYNCER /* unused */; + p->blksize = cpu_to_be32(size); + return drbd_send_command(mdev, sock, cmd, sizeof(*p), + digest, digest_size); } int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size) { - int ok; - struct p_block_req p; + struct drbd_socket *sock; + struct p_block_req *p; - p.sector = cpu_to_be64(sector); - p.block_id = BE_DRBD_MAGIC + 0xbabe; - p.blksize = cpu_to_be32(size); - - ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OV_REQUEST, - (struct p_header80 *)&p, sizeof(p)); - return ok; + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + if (!p) + return -EIO; + p->sector = cpu_to_be64(sector); + p->block_id = ID_SYNCER /* unused */; + p->blksize = cpu_to_be32(size); + return drbd_send_command(mdev, sock, P_OV_REQUEST, sizeof(*p), NULL, 0); } /* called on sndtimeo * returns false if we should retry, * true if we think connection is dead */ -static int we_should_drop_the_connection(struct drbd_conf *mdev, struct socket *sock) +static int we_should_drop_the_connection(struct drbd_tconn *tconn, struct socket *sock) { int drop_it; /* long elapsed = (long)(jiffies - mdev->last_received); */ - drop_it = mdev->meta.socket == sock - || !mdev->asender.task - || get_t_state(&mdev->asender) != Running - || mdev->state.conn < C_CONNECTED; + drop_it = tconn->meta.socket == sock + || !tconn->asender.task + || get_t_state(&tconn->asender) != RUNNING + || tconn->cstate < C_WF_REPORT_PARAMS; if (drop_it) return true; - drop_it = !--mdev->ko_count; + drop_it = !--tconn->ko_count; if (!drop_it) { - dev_err(DEV, "[%s/%d] sock_sendmsg time expired, ko = %u\n", - current->comm, current->pid, mdev->ko_count); - request_ping(mdev); + conn_err(tconn, "[%s/%d] sock_sendmsg time expired, ko = %u\n", + current->comm, current->pid, tconn->ko_count); + request_ping(tconn); } return drop_it; /* && (mdev->state == R_PRIMARY) */; } +static void drbd_update_congested(struct drbd_tconn *tconn) +{ + struct sock *sk = tconn->data.socket->sk; + if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5) + set_bit(NET_CONGESTED, &tconn->flags); +} + /* The idea of sendpage seems to be to put some kind of reference * to the page into the skb, and to hand it over to the NIC. In * this process get_page() gets called. @@ -2713,21 +1471,28 @@ static int we_should_drop_the_connection(struct drbd_conf *mdev, struct socket * * with page_count == 0 or PageSlab. */ static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page, - int offset, size_t size, unsigned msg_flags) + int offset, size_t size, unsigned msg_flags) { - int sent = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, msg_flags); + struct socket *socket; + void *addr; + int err; + + socket = mdev->tconn->data.socket; + addr = kmap(page) + offset; + err = drbd_send_all(mdev->tconn, socket, addr, size, msg_flags); kunmap(page); - if (sent == size) - mdev->send_cnt += size>>9; - return sent == size; + if (!err) + mdev->send_cnt += size >> 9; + return err; } static int _drbd_send_page(struct drbd_conf *mdev, struct page *page, int offset, size_t size, unsigned msg_flags) { + struct socket *socket = mdev->tconn->data.socket; mm_segment_t oldfs = get_fs(); - int sent, ok; int len = size; + int err = -EIO; /* e.g. XFS meta- & log-data is in slab pages, which have a * page_count of 0 and/or have PageSlab() set. @@ -2739,34 +1504,35 @@ static int _drbd_send_page(struct drbd_conf *mdev, struct page *page, return _drbd_no_send_page(mdev, page, offset, size, msg_flags); msg_flags |= MSG_NOSIGNAL; - drbd_update_congested(mdev); + drbd_update_congested(mdev->tconn); set_fs(KERNEL_DS); do { - sent = mdev->data.socket->ops->sendpage(mdev->data.socket, page, - offset, len, - msg_flags); - if (sent == -EAGAIN) { - if (we_should_drop_the_connection(mdev, - mdev->data.socket)) - break; - else - continue; - } + int sent; + + sent = socket->ops->sendpage(socket, page, offset, len, msg_flags); if (sent <= 0) { + if (sent == -EAGAIN) { + if (we_should_drop_the_connection(mdev->tconn, socket)) + break; + continue; + } dev_warn(DEV, "%s: size=%d len=%d sent=%d\n", __func__, (int)size, len, sent); + if (sent < 0) + err = sent; break; } len -= sent; offset += sent; } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/); set_fs(oldfs); - clear_bit(NET_CONGESTED, &mdev->flags); + clear_bit(NET_CONGESTED, &mdev->tconn->flags); - ok = (len == 0); - if (likely(ok)) - mdev->send_cnt += size>>9; - return ok; + if (len == 0) { + err = 0; + mdev->send_cnt += size >> 9; + } + return err; } static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio) @@ -2775,12 +1541,15 @@ static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio) int i; /* hint all but last page with MSG_MORE */ bio_for_each_segment(bvec, bio, i) { - if (!_drbd_no_send_page(mdev, bvec->bv_page, - bvec->bv_offset, bvec->bv_len, - i == bio->bi_vcnt -1 ? 0 : MSG_MORE)) - return 0; + int err; + + err = _drbd_no_send_page(mdev, bvec->bv_page, + bvec->bv_offset, bvec->bv_len, + i == bio->bi_vcnt - 1 ? 0 : MSG_MORE); + if (err) + return err; } - return 1; + return 0; } static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio) @@ -2789,32 +1558,40 @@ static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio) int i; /* hint all but last page with MSG_MORE */ bio_for_each_segment(bvec, bio, i) { - if (!_drbd_send_page(mdev, bvec->bv_page, - bvec->bv_offset, bvec->bv_len, - i == bio->bi_vcnt -1 ? 0 : MSG_MORE)) - return 0; + int err; + + err = _drbd_send_page(mdev, bvec->bv_page, + bvec->bv_offset, bvec->bv_len, + i == bio->bi_vcnt - 1 ? 0 : MSG_MORE); + if (err) + return err; } - return 1; + return 0; } -static int _drbd_send_zc_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e) +static int _drbd_send_zc_ee(struct drbd_conf *mdev, + struct drbd_peer_request *peer_req) { - struct page *page = e->pages; - unsigned len = e->size; + struct page *page = peer_req->pages; + unsigned len = peer_req->i.size; + int err; + /* hint all but last page with MSG_MORE */ page_chain_for_each(page) { unsigned l = min_t(unsigned, len, PAGE_SIZE); - if (!_drbd_send_page(mdev, page, 0, l, - page_chain_next(page) ? MSG_MORE : 0)) - return 0; + + err = _drbd_send_page(mdev, page, 0, l, + page_chain_next(page) ? MSG_MORE : 0); + if (err) + return err; len -= l; } - return 1; + return 0; } static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw) { - if (mdev->agreed_pro_version >= 95) + if (mdev->tconn->agreed_pro_version >= 95) return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) | (bi_rw & REQ_FUA ? DP_FUA : 0) | (bi_rw & REQ_FLUSH ? DP_FLUSH : 0) | @@ -2828,50 +1605,36 @@ static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw) */ int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req) { - int ok = 1; - struct p_data p; + struct drbd_socket *sock; + struct p_data *p; unsigned int dp_flags = 0; - void *dgb; int dgs; + int err; - if (!drbd_get_data_sock(mdev)) - return 0; - - dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ? - crypto_hash_digestsize(mdev->integrity_w_tfm) : 0; - - if (req->size <= DRBD_MAX_SIZE_H80_PACKET) { - p.head.h80.magic = BE_DRBD_MAGIC; - p.head.h80.command = cpu_to_be16(P_DATA); - p.head.h80.length = - cpu_to_be16(sizeof(p) - sizeof(union p_header) + dgs + req->size); - } else { - p.head.h95.magic = BE_DRBD_MAGIC_BIG; - p.head.h95.command = cpu_to_be16(P_DATA); - p.head.h95.length = - cpu_to_be32(sizeof(p) - sizeof(union p_header) + dgs + req->size); - } - - p.sector = cpu_to_be64(req->sector); - p.block_id = (unsigned long)req; - p.seq_num = cpu_to_be32(atomic_add_return(1, &mdev->packet_seq)); + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + dgs = mdev->tconn->integrity_tfm ? crypto_hash_digestsize(mdev->tconn->integrity_tfm) : 0; + if (!p) + return -EIO; + p->sector = cpu_to_be64(req->i.sector); + p->block_id = (unsigned long)req; + p->seq_num = cpu_to_be32(atomic_inc_return(&mdev->packet_seq)); dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw); - if (mdev->state.conn >= C_SYNC_SOURCE && mdev->state.conn <= C_PAUSED_SYNC_T) dp_flags |= DP_MAY_SET_IN_SYNC; - - p.dp_flags = cpu_to_be32(dp_flags); - set_bit(UNPLUG_REMOTE, &mdev->flags); - ok = (sizeof(p) == - drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0)); - if (ok && dgs) { - dgb = mdev->int_dig_out; - drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, dgb); - ok = dgs == drbd_send(mdev, mdev->data.socket, dgb, dgs, 0); - } - if (ok) { + if (mdev->tconn->agreed_pro_version >= 100) { + if (req->rq_state & RQ_EXP_RECEIVE_ACK) + dp_flags |= DP_SEND_RECEIVE_ACK; + if (req->rq_state & RQ_EXP_WRITE_ACK) + dp_flags |= DP_SEND_WRITE_ACK; + } + p->dp_flags = cpu_to_be32(dp_flags); + if (dgs) + drbd_csum_bio(mdev, mdev->tconn->integrity_tfm, req->master_bio, p + 1); + err = __send_command(mdev->tconn, mdev->vnr, sock, P_DATA, sizeof(*p) + dgs, NULL, req->i.size); + if (!err) { /* For protocol A, we have to memcpy the payload into * socket buffers, as we may complete right away * as soon as we handed it over to tcp, at which point the data @@ -2883,92 +1646,76 @@ int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req) * out ok after sending on this side, but does not fit on the * receiving side, we sure have detected corruption elsewhere. */ - if (mdev->net_conf->wire_protocol == DRBD_PROT_A || dgs) - ok = _drbd_send_bio(mdev, req->master_bio); + if (!(req->rq_state & (RQ_EXP_RECEIVE_ACK | RQ_EXP_WRITE_ACK)) || dgs) + err = _drbd_send_bio(mdev, req->master_bio); else - ok = _drbd_send_zc_bio(mdev, req->master_bio); + err = _drbd_send_zc_bio(mdev, req->master_bio); /* double check digest, sometimes buffers have been modified in flight. */ if (dgs > 0 && dgs <= 64) { /* 64 byte, 512 bit, is the largest digest size * currently supported in kernel crypto. */ unsigned char digest[64]; - drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, digest); - if (memcmp(mdev->int_dig_out, digest, dgs)) { + drbd_csum_bio(mdev, mdev->tconn->integrity_tfm, req->master_bio, digest); + if (memcmp(p + 1, digest, dgs)) { dev_warn(DEV, "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n", - (unsigned long long)req->sector, req->size); + (unsigned long long)req->i.sector, req->i.size); } } /* else if (dgs > 64) { ... Be noisy about digest too large ... } */ } + mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */ - drbd_put_data_sock(mdev); - - return ok; + return err; } /* answer packet, used to send data back for read requests: * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY) * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY) */ -int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd, - struct drbd_epoch_entry *e) +int drbd_send_block(struct drbd_conf *mdev, enum drbd_packet cmd, + struct drbd_peer_request *peer_req) { - int ok; - struct p_data p; - void *dgb; + struct drbd_socket *sock; + struct p_data *p; + int err; int dgs; - dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ? - crypto_hash_digestsize(mdev->integrity_w_tfm) : 0; - - if (e->size <= DRBD_MAX_SIZE_H80_PACKET) { - p.head.h80.magic = BE_DRBD_MAGIC; - p.head.h80.command = cpu_to_be16(cmd); - p.head.h80.length = - cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + dgs + e->size); - } else { - p.head.h95.magic = BE_DRBD_MAGIC_BIG; - p.head.h95.command = cpu_to_be16(cmd); - p.head.h95.length = - cpu_to_be32(sizeof(p) - sizeof(struct p_header80) + dgs + e->size); - } - - p.sector = cpu_to_be64(e->sector); - p.block_id = e->block_id; - /* p.seq_num = 0; No sequence numbers here.. */ - - /* Only called by our kernel thread. - * This one may be interrupted by DRBD_SIG and/or DRBD_SIGKILL - * in response to admin command or module unload. - */ - if (!drbd_get_data_sock(mdev)) - return 0; + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); - ok = sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0); - if (ok && dgs) { - dgb = mdev->int_dig_out; - drbd_csum_ee(mdev, mdev->integrity_w_tfm, e, dgb); - ok = dgs == drbd_send(mdev, mdev->data.socket, dgb, dgs, 0); - } - if (ok) - ok = _drbd_send_zc_ee(mdev, e); + dgs = mdev->tconn->integrity_tfm ? crypto_hash_digestsize(mdev->tconn->integrity_tfm) : 0; - drbd_put_data_sock(mdev); + if (!p) + return -EIO; + p->sector = cpu_to_be64(peer_req->i.sector); + p->block_id = peer_req->block_id; + p->seq_num = 0; /* unused */ + p->dp_flags = 0; + if (dgs) + drbd_csum_ee(mdev, mdev->tconn->integrity_tfm, peer_req, p + 1); + err = __send_command(mdev->tconn, mdev->vnr, sock, cmd, sizeof(*p) + dgs, NULL, peer_req->i.size); + if (!err) + err = _drbd_send_zc_ee(mdev, peer_req); + mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */ - return ok; + return err; } -int drbd_send_oos(struct drbd_conf *mdev, struct drbd_request *req) +int drbd_send_out_of_sync(struct drbd_conf *mdev, struct drbd_request *req) { - struct p_block_desc p; - - p.sector = cpu_to_be64(req->sector); - p.blksize = cpu_to_be32(req->size); + struct drbd_socket *sock; + struct p_block_desc *p; - return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OUT_OF_SYNC, &p.head, sizeof(p)); + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + if (!p) + return -EIO; + p->sector = cpu_to_be64(req->i.sector); + p->blksize = cpu_to_be32(req->i.size); + return drbd_send_command(mdev, sock, P_OUT_OF_SYNC, sizeof(*p), NULL, 0); } /* @@ -2987,7 +1734,7 @@ int drbd_send_oos(struct drbd_conf *mdev, struct drbd_request *req) /* * you must have down()ed the appropriate [m]sock_mutex elsewhere! */ -int drbd_send(struct drbd_conf *mdev, struct socket *sock, +int drbd_send(struct drbd_tconn *tconn, struct socket *sock, void *buf, size_t size, unsigned msg_flags) { struct kvec iov; @@ -2995,7 +1742,7 @@ int drbd_send(struct drbd_conf *mdev, struct socket *sock, int rv, sent = 0; if (!sock) - return -1000; + return -EBADR; /* THINK if (signal_pending) return ... ? */ @@ -3008,9 +1755,11 @@ int drbd_send(struct drbd_conf *mdev, struct socket *sock, msg.msg_controllen = 0; msg.msg_flags = msg_flags | MSG_NOSIGNAL; - if (sock == mdev->data.socket) { - mdev->ko_count = mdev->net_conf->ko_count; - drbd_update_congested(mdev); + if (sock == tconn->data.socket) { + rcu_read_lock(); + tconn->ko_count = rcu_dereference(tconn->net_conf)->ko_count; + rcu_read_unlock(); + drbd_update_congested(tconn); } do { /* STRANGE @@ -3024,12 +1773,11 @@ int drbd_send(struct drbd_conf *mdev, struct socket *sock, */ rv = kernel_sendmsg(sock, &msg, &iov, 1, size); if (rv == -EAGAIN) { - if (we_should_drop_the_connection(mdev, sock)) + if (we_should_drop_the_connection(tconn, sock)) break; else continue; } - D_ASSERT(rv != 0); if (rv == -EINTR) { flush_signals(current); rv = 0; @@ -3041,22 +1789,40 @@ int drbd_send(struct drbd_conf *mdev, struct socket *sock, iov.iov_len -= rv; } while (sent < size); - if (sock == mdev->data.socket) - clear_bit(NET_CONGESTED, &mdev->flags); + if (sock == tconn->data.socket) + clear_bit(NET_CONGESTED, &tconn->flags); if (rv <= 0) { if (rv != -EAGAIN) { - dev_err(DEV, "%s_sendmsg returned %d\n", - sock == mdev->meta.socket ? "msock" : "sock", - rv); - drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); + conn_err(tconn, "%s_sendmsg returned %d\n", + sock == tconn->meta.socket ? "msock" : "sock", + rv); + conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD); } else - drbd_force_state(mdev, NS(conn, C_TIMEOUT)); + conn_request_state(tconn, NS(conn, C_TIMEOUT), CS_HARD); } return sent; } +/** + * drbd_send_all - Send an entire buffer + * + * Returns 0 upon success and a negative error value otherwise. + */ +int drbd_send_all(struct drbd_tconn *tconn, struct socket *sock, void *buffer, + size_t size, unsigned msg_flags) +{ + int err; + + err = drbd_send(tconn, sock, buffer, size, msg_flags); + if (err < 0) + return err; + if (err != size) + return -EIO; + return 0; +} + static int drbd_open(struct block_device *bdev, fmode_t mode) { struct drbd_conf *mdev = bdev->bd_disk->private_data; @@ -3064,7 +1830,7 @@ static int drbd_open(struct block_device *bdev, fmode_t mode) int rv = 0; mutex_lock(&drbd_main_mutex); - spin_lock_irqsave(&mdev->req_lock, flags); + spin_lock_irqsave(&mdev->tconn->req_lock, flags); /* to have a stable mdev->state.role * and no race with updating open_cnt */ @@ -3077,7 +1843,7 @@ static int drbd_open(struct block_device *bdev, fmode_t mode) if (!rv) mdev->open_cnt++; - spin_unlock_irqrestore(&mdev->req_lock, flags); + spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); mutex_unlock(&drbd_main_mutex); return rv; @@ -3094,35 +1860,14 @@ static int drbd_release(struct gendisk *gd, fmode_t mode) static void drbd_set_defaults(struct drbd_conf *mdev) { - /* This way we get a compile error when sync_conf grows, - and we forgot to initialize it here */ - mdev->sync_conf = (struct syncer_conf) { - /* .rate = */ DRBD_RATE_DEF, - /* .after = */ DRBD_AFTER_DEF, - /* .al_extents = */ DRBD_AL_EXTENTS_DEF, - /* .verify_alg = */ {}, 0, - /* .cpu_mask = */ {}, 0, - /* .csums_alg = */ {}, 0, - /* .use_rle = */ 0, - /* .on_no_data = */ DRBD_ON_NO_DATA_DEF, - /* .c_plan_ahead = */ DRBD_C_PLAN_AHEAD_DEF, - /* .c_delay_target = */ DRBD_C_DELAY_TARGET_DEF, - /* .c_fill_target = */ DRBD_C_FILL_TARGET_DEF, - /* .c_max_rate = */ DRBD_C_MAX_RATE_DEF, - /* .c_min_rate = */ DRBD_C_MIN_RATE_DEF - }; - - /* Have to use that way, because the layout differs between - big endian and little endian */ - mdev->state = (union drbd_state) { + /* Beware! The actual layout differs + * between big endian and little endian */ + mdev->state = (union drbd_dev_state) { { .role = R_SECONDARY, .peer = R_UNKNOWN, .conn = C_STANDALONE, .disk = D_DISKLESS, .pdsk = D_UNKNOWN, - .susp = 0, - .susp_nod = 0, - .susp_fen = 0 } }; } @@ -3138,28 +1883,17 @@ void drbd_init_set_defaults(struct drbd_conf *mdev) atomic_set(&mdev->rs_pending_cnt, 0); atomic_set(&mdev->unacked_cnt, 0); atomic_set(&mdev->local_cnt, 0); - atomic_set(&mdev->net_cnt, 0); - atomic_set(&mdev->packet_seq, 0); - atomic_set(&mdev->pp_in_use, 0); atomic_set(&mdev->pp_in_use_by_net, 0); atomic_set(&mdev->rs_sect_in, 0); atomic_set(&mdev->rs_sect_ev, 0); atomic_set(&mdev->ap_in_flight, 0); atomic_set(&mdev->md_io_in_use, 0); - mutex_init(&mdev->data.mutex); - mutex_init(&mdev->meta.mutex); - sema_init(&mdev->data.work.s, 0); - sema_init(&mdev->meta.work.s, 0); - mutex_init(&mdev->state_mutex); - - spin_lock_init(&mdev->data.work.q_lock); - spin_lock_init(&mdev->meta.work.q_lock); + mutex_init(&mdev->own_state_mutex); + mdev->state_mutex = &mdev->own_state_mutex; spin_lock_init(&mdev->al_lock); - spin_lock_init(&mdev->req_lock); spin_lock_init(&mdev->peer_seq_lock); - spin_lock_init(&mdev->epoch_lock); INIT_LIST_HEAD(&mdev->active_ee); INIT_LIST_HEAD(&mdev->sync_ee); @@ -3167,8 +1901,6 @@ void drbd_init_set_defaults(struct drbd_conf *mdev) INIT_LIST_HEAD(&mdev->read_ee); INIT_LIST_HEAD(&mdev->net_ee); INIT_LIST_HEAD(&mdev->resync_reads); - INIT_LIST_HEAD(&mdev->data.work.q); - INIT_LIST_HEAD(&mdev->meta.work.q); INIT_LIST_HEAD(&mdev->resync_work.list); INIT_LIST_HEAD(&mdev->unplug_work.list); INIT_LIST_HEAD(&mdev->go_diskless.list); @@ -3182,6 +1914,14 @@ void drbd_init_set_defaults(struct drbd_conf *mdev) mdev->md_sync_work.cb = w_md_sync; mdev->bm_io_work.w.cb = w_bitmap_io; mdev->start_resync_work.cb = w_start_resync; + + mdev->resync_work.mdev = mdev; + mdev->unplug_work.mdev = mdev; + mdev->go_diskless.mdev = mdev; + mdev->md_sync_work.mdev = mdev; + mdev->bm_io_work.w.mdev = mdev; + mdev->start_resync_work.mdev = mdev; + init_timer(&mdev->resync_timer); init_timer(&mdev->md_sync_timer); init_timer(&mdev->start_resync_timer); @@ -3197,17 +1937,10 @@ void drbd_init_set_defaults(struct drbd_conf *mdev) init_waitqueue_head(&mdev->misc_wait); init_waitqueue_head(&mdev->state_wait); - init_waitqueue_head(&mdev->net_cnt_wait); init_waitqueue_head(&mdev->ee_wait); init_waitqueue_head(&mdev->al_wait); init_waitqueue_head(&mdev->seq_wait); - drbd_thread_init(mdev, &mdev->receiver, drbdd_init); - drbd_thread_init(mdev, &mdev->worker, drbd_worker); - drbd_thread_init(mdev, &mdev->asender, drbd_asender); - - mdev->agreed_pro_version = PRO_VERSION_MAX; - mdev->write_ordering = WO_bdev_flush; mdev->resync_wenr = LC_FREE; mdev->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE; mdev->local_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE; @@ -3216,13 +1949,10 @@ void drbd_init_set_defaults(struct drbd_conf *mdev) void drbd_mdev_cleanup(struct drbd_conf *mdev) { int i; - if (mdev->receiver.t_state != None) + if (mdev->tconn->receiver.t_state != NONE) dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n", - mdev->receiver.t_state); + mdev->tconn->receiver.t_state); - /* no need to lock it, I'm the only thread alive */ - if (atomic_read(&mdev->current_epoch->epoch_size) != 0) - dev_err(DEV, "epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size)); mdev->al_writ_cnt = mdev->bm_writ_cnt = mdev->read_cnt = @@ -3239,7 +1969,7 @@ void drbd_mdev_cleanup(struct drbd_conf *mdev) mdev->rs_mark_left[i] = 0; mdev->rs_mark_time[i] = 0; } - D_ASSERT(mdev->net_conf == NULL); + D_ASSERT(mdev->tconn->net_conf == NULL); drbd_set_my_capacity(mdev, 0); if (mdev->bitmap) { @@ -3248,21 +1978,18 @@ void drbd_mdev_cleanup(struct drbd_conf *mdev) drbd_bm_cleanup(mdev); } - drbd_free_resources(mdev); + drbd_free_bc(mdev->ldev); + mdev->ldev = NULL; + clear_bit(AL_SUSPENDED, &mdev->flags); - /* - * currently we drbd_init_ee only on module load, so - * we may do drbd_release_ee only on module unload! - */ D_ASSERT(list_empty(&mdev->active_ee)); D_ASSERT(list_empty(&mdev->sync_ee)); D_ASSERT(list_empty(&mdev->done_ee)); D_ASSERT(list_empty(&mdev->read_ee)); D_ASSERT(list_empty(&mdev->net_ee)); D_ASSERT(list_empty(&mdev->resync_reads)); - D_ASSERT(list_empty(&mdev->data.work.q)); - D_ASSERT(list_empty(&mdev->meta.work.q)); + D_ASSERT(list_empty(&mdev->tconn->sender_work.q)); D_ASSERT(list_empty(&mdev->resync_work.list)); D_ASSERT(list_empty(&mdev->unplug_work.list)); D_ASSERT(list_empty(&mdev->go_diskless.list)); @@ -3336,7 +2063,7 @@ static int drbd_create_mempools(void) goto Enomem; drbd_ee_cache = kmem_cache_create( - "drbd_ee", sizeof(struct drbd_epoch_entry), 0, 0, NULL); + "drbd_ee", sizeof(struct drbd_peer_request), 0, 0, NULL); if (drbd_ee_cache == NULL) goto Enomem; @@ -3351,11 +2078,9 @@ static int drbd_create_mempools(void) goto Enomem; /* mempools */ -#ifdef COMPAT_HAVE_BIOSET_CREATE drbd_md_io_bio_set = bioset_create(DRBD_MIN_POOL_PAGES, 0); if (drbd_md_io_bio_set == NULL) goto Enomem; -#endif drbd_md_io_page_pool = mempool_create_page_pool(DRBD_MIN_POOL_PAGES, 0); if (drbd_md_io_page_pool == NULL) @@ -3404,73 +2129,53 @@ static struct notifier_block drbd_notifier = { .notifier_call = drbd_notify_sys, }; -static void drbd_release_ee_lists(struct drbd_conf *mdev) +static void drbd_release_all_peer_reqs(struct drbd_conf *mdev) { int rr; - rr = drbd_release_ee(mdev, &mdev->active_ee); + rr = drbd_free_peer_reqs(mdev, &mdev->active_ee); if (rr) dev_err(DEV, "%d EEs in active list found!\n", rr); - rr = drbd_release_ee(mdev, &mdev->sync_ee); + rr = drbd_free_peer_reqs(mdev, &mdev->sync_ee); if (rr) dev_err(DEV, "%d EEs in sync list found!\n", rr); - rr = drbd_release_ee(mdev, &mdev->read_ee); + rr = drbd_free_peer_reqs(mdev, &mdev->read_ee); if (rr) dev_err(DEV, "%d EEs in read list found!\n", rr); - rr = drbd_release_ee(mdev, &mdev->done_ee); + rr = drbd_free_peer_reqs(mdev, &mdev->done_ee); if (rr) dev_err(DEV, "%d EEs in done list found!\n", rr); - rr = drbd_release_ee(mdev, &mdev->net_ee); + rr = drbd_free_peer_reqs(mdev, &mdev->net_ee); if (rr) dev_err(DEV, "%d EEs in net list found!\n", rr); } -/* caution. no locking. - * currently only used from module cleanup code. */ -static void drbd_delete_device(unsigned int minor) +/* caution. no locking. */ +void drbd_minor_destroy(struct kref *kref) { - struct drbd_conf *mdev = minor_to_mdev(minor); - - if (!mdev) - return; + struct drbd_conf *mdev = container_of(kref, struct drbd_conf, kref); + struct drbd_tconn *tconn = mdev->tconn; del_timer_sync(&mdev->request_timer); /* paranoia asserts */ - if (mdev->open_cnt != 0) - dev_err(DEV, "open_cnt = %d in %s:%u", mdev->open_cnt, - __FILE__ , __LINE__); - - ERR_IF (!list_empty(&mdev->data.work.q)) { - struct list_head *lp; - list_for_each(lp, &mdev->data.work.q) { - dev_err(DEV, "lp = %p\n", lp); - } - }; + D_ASSERT(mdev->open_cnt == 0); /* end paranoia asserts */ - del_gendisk(mdev->vdisk); - /* cleanup stuff that may have been allocated during * device (re-)configuration or state changes */ if (mdev->this_bdev) bdput(mdev->this_bdev); - drbd_free_resources(mdev); + drbd_free_bc(mdev->ldev); + mdev->ldev = NULL; - drbd_release_ee_lists(mdev); - - /* should be freed on disconnect? */ - kfree(mdev->ee_hash); - /* - mdev->ee_hash_s = 0; - mdev->ee_hash = NULL; - */ + drbd_release_all_peer_reqs(mdev); lc_destroy(mdev->act_log); lc_destroy(mdev->resync); @@ -3478,19 +2183,101 @@ static void drbd_delete_device(unsigned int minor) kfree(mdev->p_uuid); /* mdev->p_uuid = NULL; */ - kfree(mdev->int_dig_out); - kfree(mdev->int_dig_in); - kfree(mdev->int_dig_vv); + if (mdev->bitmap) /* should no longer be there. */ + drbd_bm_cleanup(mdev); + __free_page(mdev->md_io_page); + put_disk(mdev->vdisk); + blk_cleanup_queue(mdev->rq_queue); + kfree(mdev->rs_plan_s); + kfree(mdev); - /* cleanup the rest that has been - * allocated from drbd_new_device - * and actually free the mdev itself */ - drbd_free_mdev(mdev); + kref_put(&tconn->kref, &conn_destroy); } +/* One global retry thread, if we need to push back some bio and have it + * reinserted through our make request function. + */ +static struct retry_worker { + struct workqueue_struct *wq; + struct work_struct worker; + + spinlock_t lock; + struct list_head writes; +} retry; + +static void do_retry(struct work_struct *ws) +{ + struct retry_worker *retry = container_of(ws, struct retry_worker, worker); + LIST_HEAD(writes); + struct drbd_request *req, *tmp; + + spin_lock_irq(&retry->lock); + list_splice_init(&retry->writes, &writes); + spin_unlock_irq(&retry->lock); + + list_for_each_entry_safe(req, tmp, &writes, tl_requests) { + struct drbd_conf *mdev = req->w.mdev; + struct bio *bio = req->master_bio; + unsigned long start_time = req->start_time; + bool expected; + + expected = + expect(atomic_read(&req->completion_ref) == 0) && + expect(req->rq_state & RQ_POSTPONED) && + expect((req->rq_state & RQ_LOCAL_PENDING) == 0 || + (req->rq_state & RQ_LOCAL_ABORTED) != 0); + + if (!expected) + dev_err(DEV, "req=%p completion_ref=%d rq_state=%x\n", + req, atomic_read(&req->completion_ref), + req->rq_state); + + /* We still need to put one kref associated with the + * "completion_ref" going zero in the code path that queued it + * here. The request object may still be referenced by a + * frozen local req->private_bio, in case we force-detached. + */ + kref_put(&req->kref, drbd_req_destroy); + + /* A single suspended or otherwise blocking device may stall + * all others as well. Fortunately, this code path is to + * recover from a situation that "should not happen": + * concurrent writes in multi-primary setup. + * In a "normal" lifecycle, this workqueue is supposed to be + * destroyed without ever doing anything. + * If it turns out to be an issue anyways, we can do per + * resource (replication group) or per device (minor) retry + * workqueues instead. + */ + + /* We are not just doing generic_make_request(), + * as we want to keep the start_time information. */ + inc_ap_bio(mdev); + __drbd_make_request(mdev, bio, start_time); + } +} + +void drbd_restart_request(struct drbd_request *req) +{ + unsigned long flags; + spin_lock_irqsave(&retry.lock, flags); + list_move_tail(&req->tl_requests, &retry.writes); + spin_unlock_irqrestore(&retry.lock, flags); + + /* Drop the extra reference that would otherwise + * have been dropped by complete_master_bio. + * do_retry() needs to grab a new one. */ + dec_ap_bio(req->w.mdev); + + queue_work(retry.wq, &retry.worker); +} + + static void drbd_cleanup(void) { unsigned int i; + struct drbd_conf *mdev; + struct drbd_tconn *tconn, *tmp; unregister_reboot_notifier(&drbd_notifier); @@ -3505,19 +2292,31 @@ static void drbd_cleanup(void) if (drbd_proc) remove_proc_entry("drbd", NULL); - drbd_nl_cleanup(); + if (retry.wq) + destroy_workqueue(retry.wq); + + drbd_genl_unregister(); - if (minor_table) { - i = minor_count; - while (i--) - drbd_delete_device(i); - drbd_destroy_mempools(); + idr_for_each_entry(&minors, mdev, i) { + idr_remove(&minors, mdev_to_minor(mdev)); + idr_remove(&mdev->tconn->volumes, mdev->vnr); + del_gendisk(mdev->vdisk); + /* synchronize_rcu(); No other threads running at this point */ + kref_put(&mdev->kref, &drbd_minor_destroy); } - kfree(minor_table); + /* not _rcu since, no other updater anymore. Genl already unregistered */ + list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) { + list_del(&tconn->all_tconn); /* not _rcu no proc, not other threads */ + /* synchronize_rcu(); */ + kref_put(&tconn->kref, &conn_destroy); + } + drbd_destroy_mempools(); unregister_blkdev(DRBD_MAJOR, "drbd"); + idr_destroy(&minors); + printk(KERN_INFO "drbd: module cleanup done.\n"); } @@ -3542,7 +2341,7 @@ static int drbd_congested(void *congested_data, int bdi_bits) goto out; } - if (test_bit(CALLBACK_PENDING, &mdev->flags)) { + if (test_bit(CALLBACK_PENDING, &mdev->tconn->flags)) { r |= (1 << BDI_async_congested); /* Without good local data, we would need to read from remote, * and that would need the worker thread as well, which is @@ -3566,7 +2365,7 @@ static int drbd_congested(void *congested_data, int bdi_bits) reason = 'b'; } - if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->flags)) { + if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->tconn->flags)) { r |= (1 << BDI_async_congested); reason = reason == 'b' ? 'a' : 'n'; } @@ -3576,20 +2375,243 @@ out: return r; } -struct drbd_conf *drbd_new_device(unsigned int minor) +static void drbd_init_workqueue(struct drbd_work_queue* wq) +{ + spin_lock_init(&wq->q_lock); + INIT_LIST_HEAD(&wq->q); + init_waitqueue_head(&wq->q_wait); +} + +struct drbd_tconn *conn_get_by_name(const char *name) +{ + struct drbd_tconn *tconn; + + if (!name || !name[0]) + return NULL; + + rcu_read_lock(); + list_for_each_entry_rcu(tconn, &drbd_tconns, all_tconn) { + if (!strcmp(tconn->name, name)) { + kref_get(&tconn->kref); + goto found; + } + } + tconn = NULL; +found: + rcu_read_unlock(); + return tconn; +} + +struct drbd_tconn *conn_get_by_addrs(void *my_addr, int my_addr_len, + void *peer_addr, int peer_addr_len) +{ + struct drbd_tconn *tconn; + + rcu_read_lock(); + list_for_each_entry_rcu(tconn, &drbd_tconns, all_tconn) { + if (tconn->my_addr_len == my_addr_len && + tconn->peer_addr_len == peer_addr_len && + !memcmp(&tconn->my_addr, my_addr, my_addr_len) && + !memcmp(&tconn->peer_addr, peer_addr, peer_addr_len)) { + kref_get(&tconn->kref); + goto found; + } + } + tconn = NULL; +found: + rcu_read_unlock(); + return tconn; +} + +static int drbd_alloc_socket(struct drbd_socket *socket) +{ + socket->rbuf = (void *) __get_free_page(GFP_KERNEL); + if (!socket->rbuf) + return -ENOMEM; + socket->sbuf = (void *) __get_free_page(GFP_KERNEL); + if (!socket->sbuf) + return -ENOMEM; + return 0; +} + +static void drbd_free_socket(struct drbd_socket *socket) +{ + free_page((unsigned long) socket->sbuf); + free_page((unsigned long) socket->rbuf); +} + +void conn_free_crypto(struct drbd_tconn *tconn) +{ + drbd_free_sock(tconn); + + crypto_free_hash(tconn->csums_tfm); + crypto_free_hash(tconn->verify_tfm); + crypto_free_hash(tconn->cram_hmac_tfm); + crypto_free_hash(tconn->integrity_tfm); + crypto_free_hash(tconn->peer_integrity_tfm); + kfree(tconn->int_dig_in); + kfree(tconn->int_dig_vv); + + tconn->csums_tfm = NULL; + tconn->verify_tfm = NULL; + tconn->cram_hmac_tfm = NULL; + tconn->integrity_tfm = NULL; + tconn->peer_integrity_tfm = NULL; + tconn->int_dig_in = NULL; + tconn->int_dig_vv = NULL; +} + +int set_resource_options(struct drbd_tconn *tconn, struct res_opts *res_opts) +{ + cpumask_var_t new_cpu_mask; + int err; + + if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) + return -ENOMEM; + /* + retcode = ERR_NOMEM; + drbd_msg_put_info("unable to allocate cpumask"); + */ + + /* silently ignore cpu mask on UP kernel */ + if (nr_cpu_ids > 1 && res_opts->cpu_mask[0] != 0) { + /* FIXME: Get rid of constant 32 here */ + err = bitmap_parse(res_opts->cpu_mask, 32, + cpumask_bits(new_cpu_mask), nr_cpu_ids); + if (err) { + conn_warn(tconn, "bitmap_parse() failed with %d\n", err); + /* retcode = ERR_CPU_MASK_PARSE; */ + goto fail; + } + } + tconn->res_opts = *res_opts; + if (!cpumask_equal(tconn->cpu_mask, new_cpu_mask)) { + cpumask_copy(tconn->cpu_mask, new_cpu_mask); + drbd_calc_cpu_mask(tconn); + tconn->receiver.reset_cpu_mask = 1; + tconn->asender.reset_cpu_mask = 1; + tconn->worker.reset_cpu_mask = 1; + } + err = 0; + +fail: + free_cpumask_var(new_cpu_mask); + return err; + +} + +/* caller must be under genl_lock() */ +struct drbd_tconn *conn_create(const char *name, struct res_opts *res_opts) +{ + struct drbd_tconn *tconn; + + tconn = kzalloc(sizeof(struct drbd_tconn), GFP_KERNEL); + if (!tconn) + return NULL; + + tconn->name = kstrdup(name, GFP_KERNEL); + if (!tconn->name) + goto fail; + + if (drbd_alloc_socket(&tconn->data)) + goto fail; + if (drbd_alloc_socket(&tconn->meta)) + goto fail; + + if (!zalloc_cpumask_var(&tconn->cpu_mask, GFP_KERNEL)) + goto fail; + + if (set_resource_options(tconn, res_opts)) + goto fail; + + tconn->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL); + if (!tconn->current_epoch) + goto fail; + + INIT_LIST_HEAD(&tconn->transfer_log); + + INIT_LIST_HEAD(&tconn->current_epoch->list); + tconn->epochs = 1; + spin_lock_init(&tconn->epoch_lock); + tconn->write_ordering = WO_bdev_flush; + + tconn->send.seen_any_write_yet = false; + tconn->send.current_epoch_nr = 0; + tconn->send.current_epoch_writes = 0; + + tconn->cstate = C_STANDALONE; + mutex_init(&tconn->cstate_mutex); + spin_lock_init(&tconn->req_lock); + mutex_init(&tconn->conf_update); + init_waitqueue_head(&tconn->ping_wait); + idr_init(&tconn->volumes); + + drbd_init_workqueue(&tconn->sender_work); + mutex_init(&tconn->data.mutex); + mutex_init(&tconn->meta.mutex); + + drbd_thread_init(tconn, &tconn->receiver, drbdd_init, "receiver"); + drbd_thread_init(tconn, &tconn->worker, drbd_worker, "worker"); + drbd_thread_init(tconn, &tconn->asender, drbd_asender, "asender"); + + kref_init(&tconn->kref); + list_add_tail_rcu(&tconn->all_tconn, &drbd_tconns); + + return tconn; + +fail: + kfree(tconn->current_epoch); + free_cpumask_var(tconn->cpu_mask); + drbd_free_socket(&tconn->meta); + drbd_free_socket(&tconn->data); + kfree(tconn->name); + kfree(tconn); + + return NULL; +} + +void conn_destroy(struct kref *kref) +{ + struct drbd_tconn *tconn = container_of(kref, struct drbd_tconn, kref); + + if (atomic_read(&tconn->current_epoch->epoch_size) != 0) + conn_err(tconn, "epoch_size:%d\n", atomic_read(&tconn->current_epoch->epoch_size)); + kfree(tconn->current_epoch); + + idr_destroy(&tconn->volumes); + + free_cpumask_var(tconn->cpu_mask); + drbd_free_socket(&tconn->meta); + drbd_free_socket(&tconn->data); + kfree(tconn->name); + kfree(tconn->int_dig_in); + kfree(tconn->int_dig_vv); + kfree(tconn); +} + +enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor, int vnr) { struct drbd_conf *mdev; struct gendisk *disk; struct request_queue *q; + int vnr_got = vnr; + int minor_got = minor; + enum drbd_ret_code err = ERR_NOMEM; + + mdev = minor_to_mdev(minor); + if (mdev) + return ERR_MINOR_EXISTS; /* GFP_KERNEL, we are outside of all write-out paths */ mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL); if (!mdev) - return NULL; - if (!zalloc_cpumask_var(&mdev->cpu_mask, GFP_KERNEL)) - goto out_no_cpumask; + return ERR_NOMEM; + + kref_get(&tconn->kref); + mdev->tconn = tconn; mdev->minor = minor; + mdev->vnr = vnr; drbd_init_set_defaults(mdev); @@ -3627,7 +2649,7 @@ struct drbd_conf *drbd_new_device(unsigned int minor) blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8); blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); blk_queue_merge_bvec(q, drbd_merge_bvec); - q->queue_lock = &mdev->req_lock; + q->queue_lock = &mdev->tconn->req_lock; /* needed since we use */ mdev->md_io_page = alloc_page(GFP_KERNEL); if (!mdev->md_io_page) @@ -3635,30 +2657,44 @@ struct drbd_conf *drbd_new_device(unsigned int minor) if (drbd_bm_init(mdev)) goto out_no_bitmap; - /* no need to lock access, we are still initializing this minor device. */ - if (!tl_init(mdev)) - goto out_no_tl; - - mdev->app_reads_hash = kzalloc(APP_R_HSIZE*sizeof(void *), GFP_KERNEL); - if (!mdev->app_reads_hash) - goto out_no_app_reads; - - mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL); - if (!mdev->current_epoch) - goto out_no_epoch; - - INIT_LIST_HEAD(&mdev->current_epoch->list); - mdev->epochs = 1; - - return mdev; - -/* out_whatever_else: - kfree(mdev->current_epoch); */ -out_no_epoch: - kfree(mdev->app_reads_hash); -out_no_app_reads: - tl_cleanup(mdev); -out_no_tl: + mdev->read_requests = RB_ROOT; + mdev->write_requests = RB_ROOT; + + if (!idr_pre_get(&minors, GFP_KERNEL)) + goto out_no_minor_idr; + if (idr_get_new_above(&minors, mdev, minor, &minor_got)) + goto out_no_minor_idr; + if (minor_got != minor) { + err = ERR_MINOR_EXISTS; + drbd_msg_put_info("requested minor exists already"); + goto out_idr_remove_minor; + } + + if (!idr_pre_get(&tconn->volumes, GFP_KERNEL)) + goto out_idr_remove_minor; + if (idr_get_new_above(&tconn->volumes, mdev, vnr, &vnr_got)) + goto out_idr_remove_minor; + if (vnr_got != vnr) { + err = ERR_INVALID_REQUEST; + drbd_msg_put_info("requested volume exists already"); + goto out_idr_remove_vol; + } + add_disk(disk); + kref_init(&mdev->kref); /* one ref for both idrs and the the add_disk */ + + /* inherit the connection state */ + mdev->state.conn = tconn->cstate; + if (mdev->state.conn == C_WF_REPORT_PARAMS) + drbd_connected(mdev); + + return NO_ERROR; + +out_idr_remove_vol: + idr_remove(&tconn->volumes, vnr_got); +out_idr_remove_minor: + idr_remove(&minors, minor_got); + synchronize_rcu(); +out_no_minor_idr: drbd_bm_cleanup(mdev); out_no_bitmap: __free_page(mdev->md_io_page); @@ -3667,55 +2703,25 @@ out_no_io_page: out_no_disk: blk_cleanup_queue(q); out_no_q: - free_cpumask_var(mdev->cpu_mask); -out_no_cpumask: - kfree(mdev); - return NULL; -} - -/* counterpart of drbd_new_device. - * last part of drbd_delete_device. */ -void drbd_free_mdev(struct drbd_conf *mdev) -{ - kfree(mdev->current_epoch); - kfree(mdev->app_reads_hash); - tl_cleanup(mdev); - if (mdev->bitmap) /* should no longer be there. */ - drbd_bm_cleanup(mdev); - __free_page(mdev->md_io_page); - put_disk(mdev->vdisk); - blk_cleanup_queue(mdev->rq_queue); - free_cpumask_var(mdev->cpu_mask); - drbd_free_tl_hash(mdev); kfree(mdev); + kref_put(&tconn->kref, &conn_destroy); + return err; } - int __init drbd_init(void) { int err; - if (sizeof(struct p_handshake) != 80) { - printk(KERN_ERR - "drbd: never change the size or layout " - "of the HandShake packet.\n"); - return -EINVAL; - } - if (minor_count < DRBD_MINOR_COUNT_MIN || minor_count > DRBD_MINOR_COUNT_MAX) { printk(KERN_ERR - "drbd: invalid minor_count (%d)\n", minor_count); + "drbd: invalid minor_count (%d)\n", minor_count); #ifdef MODULE return -EINVAL; #else - minor_count = 8; + minor_count = DRBD_MINOR_COUNT_DEF; #endif } - err = drbd_nl_init(); - if (err) - return err; - err = register_blkdev(DRBD_MAJOR, "drbd"); if (err) { printk(KERN_ERR @@ -3724,6 +2730,13 @@ int __init drbd_init(void) return err; } + err = drbd_genl_register(); + if (err) { + printk(KERN_ERR "drbd: unable to register generic netlink family\n"); + goto fail; + } + + register_reboot_notifier(&drbd_notifier); /* @@ -3734,22 +2747,29 @@ int __init drbd_init(void) init_waitqueue_head(&drbd_pp_wait); drbd_proc = NULL; /* play safe for drbd_cleanup */ - minor_table = kzalloc(sizeof(struct drbd_conf *)*minor_count, - GFP_KERNEL); - if (!minor_table) - goto Enomem; + idr_init(&minors); err = drbd_create_mempools(); if (err) - goto Enomem; + goto fail; drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL); if (!drbd_proc) { printk(KERN_ERR "drbd: unable to register proc file\n"); - goto Enomem; + goto fail; } rwlock_init(&global_state_lock); + INIT_LIST_HEAD(&drbd_tconns); + + retry.wq = create_singlethread_workqueue("drbd-reissue"); + if (!retry.wq) { + printk(KERN_ERR "drbd: unable to create retry workqueue\n"); + goto fail; + } + INIT_WORK(&retry.worker, do_retry); + spin_lock_init(&retry.lock); + INIT_LIST_HEAD(&retry.writes); printk(KERN_INFO "drbd: initialized. " "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n", @@ -3757,11 +2777,10 @@ int __init drbd_init(void) printk(KERN_INFO "drbd: %s\n", drbd_buildtag()); printk(KERN_INFO "drbd: registered as block device major %d\n", DRBD_MAJOR); - printk(KERN_INFO "drbd: minor_table @ 0x%p\n", minor_table); return 0; /* Success! */ -Enomem: +fail: drbd_cleanup(); if (err == -ENOMEM) /* currently always the case */ @@ -3782,47 +2801,42 @@ void drbd_free_bc(struct drbd_backing_dev *ldev) kfree(ldev); } -void drbd_free_sock(struct drbd_conf *mdev) +void drbd_free_sock(struct drbd_tconn *tconn) { - if (mdev->data.socket) { - mutex_lock(&mdev->data.mutex); - kernel_sock_shutdown(mdev->data.socket, SHUT_RDWR); - sock_release(mdev->data.socket); - mdev->data.socket = NULL; - mutex_unlock(&mdev->data.mutex); + if (tconn->data.socket) { + mutex_lock(&tconn->data.mutex); + kernel_sock_shutdown(tconn->data.socket, SHUT_RDWR); + sock_release(tconn->data.socket); + tconn->data.socket = NULL; + mutex_unlock(&tconn->data.mutex); } - if (mdev->meta.socket) { - mutex_lock(&mdev->meta.mutex); - kernel_sock_shutdown(mdev->meta.socket, SHUT_RDWR); - sock_release(mdev->meta.socket); - mdev->meta.socket = NULL; - mutex_unlock(&mdev->meta.mutex); + if (tconn->meta.socket) { + mutex_lock(&tconn->meta.mutex); + kernel_sock_shutdown(tconn->meta.socket, SHUT_RDWR); + sock_release(tconn->meta.socket); + tconn->meta.socket = NULL; + mutex_unlock(&tconn->meta.mutex); } } +/* meta data management */ -void drbd_free_resources(struct drbd_conf *mdev) +void conn_md_sync(struct drbd_tconn *tconn) { - crypto_free_hash(mdev->csums_tfm); - mdev->csums_tfm = NULL; - crypto_free_hash(mdev->verify_tfm); - mdev->verify_tfm = NULL; - crypto_free_hash(mdev->cram_hmac_tfm); - mdev->cram_hmac_tfm = NULL; - crypto_free_hash(mdev->integrity_w_tfm); - mdev->integrity_w_tfm = NULL; - crypto_free_hash(mdev->integrity_r_tfm); - mdev->integrity_r_tfm = NULL; - - drbd_free_sock(mdev); + struct drbd_conf *mdev; + int vnr; - __no_warn(local, - drbd_free_bc(mdev->ldev); - mdev->ldev = NULL;); + rcu_read_lock(); + idr_for_each_entry(&tconn->volumes, mdev, vnr) { + kref_get(&mdev->kref); + rcu_read_unlock(); + drbd_md_sync(mdev); + kref_put(&mdev->kref, &drbd_minor_destroy); + rcu_read_lock(); + } + rcu_read_unlock(); } -/* meta data management */ - struct meta_data_on_disk { u64 la_size; /* last agreed size. */ u64 uuid[UI_SIZE]; /* UUIDs. */ @@ -3833,7 +2847,7 @@ struct meta_data_on_disk { u32 md_size_sect; u32 al_offset; /* offset to this block */ u32 al_nr_extents; /* important for restoring the AL */ - /* `-- act_log->nr_elements <-- sync_conf.al_extents */ + /* `-- act_log->nr_elements <-- ldev->dc.al_extents */ u32 bm_offset; /* offset to the bitmap, from here */ u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */ u32 la_peer_max_bio_size; /* last peer max_bio_size */ @@ -3871,7 +2885,7 @@ void drbd_md_sync(struct drbd_conf *mdev) for (i = UI_CURRENT; i < UI_SIZE; i++) buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]); buffer->flags = cpu_to_be32(mdev->ldev->md.flags); - buffer->magic = cpu_to_be32(DRBD_MD_MAGIC); + buffer->magic = cpu_to_be32(DRBD_MD_MAGIC_84_UNCLEAN); buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect); buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset); @@ -3885,7 +2899,7 @@ void drbd_md_sync(struct drbd_conf *mdev) D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset); sector = mdev->ldev->md.md_offset; - if (!drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) { + if (drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) { /* this was a try anyways ... */ dev_err(DEV, "meta data update failed!\n"); drbd_chk_io_error(mdev, 1, DRBD_META_IO_ERROR); @@ -3906,11 +2920,12 @@ out: * @bdev: Device from which the meta data should be read in. * * Return 0 (NO_ERROR) on success, and an enum drbd_ret_code in case - * something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID. + * something goes wrong. */ int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) { struct meta_data_on_disk *buffer; + u32 magic, flags; int i, rv = NO_ERROR; if (!get_ldev_if_state(mdev, D_ATTACHING)) @@ -3920,7 +2935,7 @@ int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) if (!buffer) goto out; - if (!drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) { + if (drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) { /* NOTE: can't do normal error processing here as this is called BEFORE disk is attached */ dev_err(DEV, "Error while reading metadata.\n"); @@ -3928,8 +2943,20 @@ int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) goto err; } - if (be32_to_cpu(buffer->magic) != DRBD_MD_MAGIC) { - dev_err(DEV, "Error while reading metadata, magic not found.\n"); + magic = be32_to_cpu(buffer->magic); + flags = be32_to_cpu(buffer->flags); + if (magic == DRBD_MD_MAGIC_84_UNCLEAN || + (magic == DRBD_MD_MAGIC_08 && !(flags & MDF_AL_CLEAN))) { + /* btw: that's Activity Log clean, not "all" clean. */ + dev_err(DEV, "Found unclean meta data. Did you \"drbdadm apply-al\"?\n"); + rv = ERR_MD_UNCLEAN; + goto err; + } + if (magic != DRBD_MD_MAGIC_08) { + if (magic == DRBD_MD_MAGIC_07) + dev_err(DEV, "Found old (0.7) meta data magic. Did you \"drbdadm create-md\"?\n"); + else + dev_err(DEV, "Meta data magic not found. Did you \"drbdadm create-md\"?\n"); rv = ERR_MD_INVALID; goto err; } @@ -3963,20 +2990,16 @@ int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) for (i = UI_CURRENT; i < UI_SIZE; i++) bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]); bdev->md.flags = be32_to_cpu(buffer->flags); - mdev->sync_conf.al_extents = be32_to_cpu(buffer->al_nr_extents); bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid); - spin_lock_irq(&mdev->req_lock); + spin_lock_irq(&mdev->tconn->req_lock); if (mdev->state.conn < C_CONNECTED) { unsigned int peer; peer = be32_to_cpu(buffer->la_peer_max_bio_size); peer = max(peer, DRBD_MAX_BIO_SIZE_SAFE); mdev->peer_max_bio_size = peer; } - spin_unlock_irq(&mdev->req_lock); - - if (mdev->sync_conf.al_extents < 7) - mdev->sync_conf.al_extents = 127; + spin_unlock_irq(&mdev->tconn->req_lock); err: drbd_md_put_buffer(mdev); @@ -4011,7 +3034,7 @@ void drbd_md_mark_dirty(struct drbd_conf *mdev) } #endif -static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local) +void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local) { int i; @@ -4019,7 +3042,7 @@ static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local) mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i]; } -void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) +void __drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) { if (idx == UI_CURRENT) { if (mdev->state.role == R_PRIMARY) @@ -4034,14 +3057,24 @@ void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) drbd_md_mark_dirty(mdev); } +void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) +{ + unsigned long flags; + spin_lock_irqsave(&mdev->ldev->md.uuid_lock, flags); + __drbd_uuid_set(mdev, idx, val); + spin_unlock_irqrestore(&mdev->ldev->md.uuid_lock, flags); +} void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) { + unsigned long flags; + spin_lock_irqsave(&mdev->ldev->md.uuid_lock, flags); if (mdev->ldev->md.uuid[idx]) { drbd_uuid_move_history(mdev); mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx]; } - _drbd_uuid_set(mdev, idx, val); + __drbd_uuid_set(mdev, idx, val); + spin_unlock_irqrestore(&mdev->ldev->md.uuid_lock, flags); } /** @@ -4054,15 +3087,20 @@ void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local) { u64 val; - unsigned long long bm_uuid = mdev->ldev->md.uuid[UI_BITMAP]; + unsigned long long bm_uuid; + + get_random_bytes(&val, sizeof(u64)); + + spin_lock_irq(&mdev->ldev->md.uuid_lock); + bm_uuid = mdev->ldev->md.uuid[UI_BITMAP]; if (bm_uuid) dev_warn(DEV, "bm UUID was already set: %llX\n", bm_uuid); mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT]; + __drbd_uuid_set(mdev, UI_CURRENT, val); + spin_unlock_irq(&mdev->ldev->md.uuid_lock); - get_random_bytes(&val, sizeof(u64)); - _drbd_uuid_set(mdev, UI_CURRENT, val); drbd_print_uuids(mdev, "new current UUID"); /* get it to stable storage _now_ */ drbd_md_sync(mdev); @@ -4070,9 +3108,11 @@ void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local) void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local) { + unsigned long flags; if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0) return; + spin_lock_irqsave(&mdev->ldev->md.uuid_lock, flags); if (val == 0) { drbd_uuid_move_history(mdev); mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP]; @@ -4084,6 +3124,8 @@ void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local) mdev->ldev->md.uuid[UI_BITMAP] = val & ~((u64)1); } + spin_unlock_irqrestore(&mdev->ldev->md.uuid_lock, flags); + drbd_md_mark_dirty(mdev); } @@ -4135,9 +3177,10 @@ int drbd_bmio_clear_n_write(struct drbd_conf *mdev) return rv; } -static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused) +static int w_bitmap_io(struct drbd_work *w, int unused) { struct bm_io_work *work = container_of(w, struct bm_io_work, w); + struct drbd_conf *mdev = w->mdev; int rv = -EIO; D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0); @@ -4149,8 +3192,7 @@ static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused) put_ldev(mdev); } - clear_bit(BITMAP_IO, &mdev->flags); - smp_mb__after_clear_bit(); + clear_bit_unlock(BITMAP_IO, &mdev->flags); wake_up(&mdev->misc_wait); if (work->done) @@ -4160,7 +3202,7 @@ static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused) work->why = NULL; work->flags = 0; - return 1; + return 0; } void drbd_ldev_destroy(struct drbd_conf *mdev) @@ -4173,29 +3215,51 @@ void drbd_ldev_destroy(struct drbd_conf *mdev) drbd_free_bc(mdev->ldev); mdev->ldev = NULL;); - if (mdev->md_io_tmpp) { - __free_page(mdev->md_io_tmpp); - mdev->md_io_tmpp = NULL; - } clear_bit(GO_DISKLESS, &mdev->flags); } -static int w_go_diskless(struct drbd_conf *mdev, struct drbd_work *w, int unused) +static int w_go_diskless(struct drbd_work *w, int unused) { + struct drbd_conf *mdev = w->mdev; + D_ASSERT(mdev->state.disk == D_FAILED); /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will * inc/dec it frequently. Once we are D_DISKLESS, no one will touch * the protected members anymore, though, so once put_ldev reaches zero * again, it will be safe to free them. */ + + /* Try to write changed bitmap pages, read errors may have just + * set some bits outside the area covered by the activity log. + * + * If we have an IO error during the bitmap writeout, + * we will want a full sync next time, just in case. + * (Do we want a specific meta data flag for this?) + * + * If that does not make it to stable storage either, + * we cannot do anything about that anymore. + * + * We still need to check if both bitmap and ldev are present, we may + * end up here after a failed attach, before ldev was even assigned. + */ + if (mdev->bitmap && mdev->ldev) { + if (drbd_bitmap_io_from_worker(mdev, drbd_bm_write, + "detach", BM_LOCKED_MASK)) { + if (test_bit(WAS_READ_ERROR, &mdev->flags)) { + drbd_md_set_flag(mdev, MDF_FULL_SYNC); + drbd_md_sync(mdev); + } + } + } + drbd_force_state(mdev, NS(disk, D_DISKLESS)); - return 1; + return 0; } void drbd_go_diskless(struct drbd_conf *mdev) { D_ASSERT(mdev->state.disk == D_FAILED); if (!test_and_set_bit(GO_DISKLESS, &mdev->flags)) - drbd_queue_work(&mdev->data.work, &mdev->go_diskless); + drbd_queue_work(&mdev->tconn->sender_work, &mdev->go_diskless); } /** @@ -4215,7 +3279,7 @@ void drbd_queue_bitmap_io(struct drbd_conf *mdev, void (*done)(struct drbd_conf *, int), char *why, enum bm_flag flags) { - D_ASSERT(current == mdev->worker.task); + D_ASSERT(current == mdev->tconn->worker.task); D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags)); D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags)); @@ -4229,13 +3293,13 @@ void drbd_queue_bitmap_io(struct drbd_conf *mdev, mdev->bm_io_work.why = why; mdev->bm_io_work.flags = flags; - spin_lock_irq(&mdev->req_lock); + spin_lock_irq(&mdev->tconn->req_lock); set_bit(BITMAP_IO, &mdev->flags); if (atomic_read(&mdev->ap_bio_cnt) == 0) { if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags)) - drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w); + drbd_queue_work(&mdev->tconn->sender_work, &mdev->bm_io_work.w); } - spin_unlock_irq(&mdev->req_lock); + spin_unlock_irq(&mdev->tconn->req_lock); } /** @@ -4252,7 +3316,7 @@ int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), { int rv; - D_ASSERT(current != mdev->worker.task); + D_ASSERT(current != mdev->tconn->worker.task); if ((flags & BM_LOCKED_SET_ALLOWED) == 0) drbd_suspend_io(mdev); @@ -4291,18 +3355,127 @@ static void md_sync_timer_fn(unsigned long data) { struct drbd_conf *mdev = (struct drbd_conf *) data; - drbd_queue_work_front(&mdev->data.work, &mdev->md_sync_work); + /* must not double-queue! */ + if (list_empty(&mdev->md_sync_work.list)) + drbd_queue_work_front(&mdev->tconn->sender_work, &mdev->md_sync_work); } -static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused) +static int w_md_sync(struct drbd_work *w, int unused) { + struct drbd_conf *mdev = w->mdev; + dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n"); #ifdef DEBUG dev_warn(DEV, "last md_mark_dirty: %s:%u\n", mdev->last_md_mark_dirty.func, mdev->last_md_mark_dirty.line); #endif drbd_md_sync(mdev); - return 1; + return 0; +} + +const char *cmdname(enum drbd_packet cmd) +{ + /* THINK may need to become several global tables + * when we want to support more than + * one PRO_VERSION */ + static const char *cmdnames[] = { + [P_DATA] = "Data", + [P_DATA_REPLY] = "DataReply", + [P_RS_DATA_REPLY] = "RSDataReply", + [P_BARRIER] = "Barrier", + [P_BITMAP] = "ReportBitMap", + [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget", + [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource", + [P_UNPLUG_REMOTE] = "UnplugRemote", + [P_DATA_REQUEST] = "DataRequest", + [P_RS_DATA_REQUEST] = "RSDataRequest", + [P_SYNC_PARAM] = "SyncParam", + [P_SYNC_PARAM89] = "SyncParam89", + [P_PROTOCOL] = "ReportProtocol", + [P_UUIDS] = "ReportUUIDs", + [P_SIZES] = "ReportSizes", + [P_STATE] = "ReportState", + [P_SYNC_UUID] = "ReportSyncUUID", + [P_AUTH_CHALLENGE] = "AuthChallenge", + [P_AUTH_RESPONSE] = "AuthResponse", + [P_PING] = "Ping", + [P_PING_ACK] = "PingAck", + [P_RECV_ACK] = "RecvAck", + [P_WRITE_ACK] = "WriteAck", + [P_RS_WRITE_ACK] = "RSWriteAck", + [P_SUPERSEDED] = "Superseded", + [P_NEG_ACK] = "NegAck", + [P_NEG_DREPLY] = "NegDReply", + [P_NEG_RS_DREPLY] = "NegRSDReply", + [P_BARRIER_ACK] = "BarrierAck", + [P_STATE_CHG_REQ] = "StateChgRequest", + [P_STATE_CHG_REPLY] = "StateChgReply", + [P_OV_REQUEST] = "OVRequest", + [P_OV_REPLY] = "OVReply", + [P_OV_RESULT] = "OVResult", + [P_CSUM_RS_REQUEST] = "CsumRSRequest", + [P_RS_IS_IN_SYNC] = "CsumRSIsInSync", + [P_COMPRESSED_BITMAP] = "CBitmap", + [P_DELAY_PROBE] = "DelayProbe", + [P_OUT_OF_SYNC] = "OutOfSync", + [P_RETRY_WRITE] = "RetryWrite", + [P_RS_CANCEL] = "RSCancel", + [P_CONN_ST_CHG_REQ] = "conn_st_chg_req", + [P_CONN_ST_CHG_REPLY] = "conn_st_chg_reply", + [P_RETRY_WRITE] = "retry_write", + [P_PROTOCOL_UPDATE] = "protocol_update", + + /* enum drbd_packet, but not commands - obsoleted flags: + * P_MAY_IGNORE + * P_MAX_OPT_CMD + */ + }; + + /* too big for the array: 0xfffX */ + if (cmd == P_INITIAL_META) + return "InitialMeta"; + if (cmd == P_INITIAL_DATA) + return "InitialData"; + if (cmd == P_CONNECTION_FEATURES) + return "ConnectionFeatures"; + if (cmd >= ARRAY_SIZE(cmdnames)) + return "Unknown"; + return cmdnames[cmd]; +} + +/** + * drbd_wait_misc - wait for a request to make progress + * @mdev: device associated with the request + * @i: the struct drbd_interval embedded in struct drbd_request or + * struct drbd_peer_request + */ +int drbd_wait_misc(struct drbd_conf *mdev, struct drbd_interval *i) +{ + struct net_conf *nc; + DEFINE_WAIT(wait); + long timeout; + + rcu_read_lock(); + nc = rcu_dereference(mdev->tconn->net_conf); + if (!nc) { + rcu_read_unlock(); + return -ETIMEDOUT; + } + timeout = nc->ko_count ? nc->timeout * HZ / 10 * nc->ko_count : MAX_SCHEDULE_TIMEOUT; + rcu_read_unlock(); + + /* Indicate to wake up mdev->misc_wait on progress. */ + i->waiting = true; + prepare_to_wait(&mdev->misc_wait, &wait, TASK_INTERRUPTIBLE); + spin_unlock_irq(&mdev->tconn->req_lock); + timeout = schedule_timeout(timeout); + finish_wait(&mdev->misc_wait, &wait); + spin_lock_irq(&mdev->tconn->req_lock); + if (!timeout || mdev->state.conn < C_CONNECTED) + return -ETIMEDOUT; + if (signal_pending(current)) + return -ERESTARTSYS; + return 0; } #ifdef CONFIG_DRBD_FAULT_INJECTION |