| /* |
| drbd.c |
| |
| This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
| |
| Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. |
| Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. |
| Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. |
| |
| Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev |
| from Logicworks, Inc. for making SDP replication support possible. |
| |
| drbd is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| drbd is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with drbd; see the file COPYING. If not, write to |
| the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/drbd.h> |
| #include <asm/uaccess.h> |
| #include <asm/types.h> |
| #include <net/sock.h> |
| #include <linux/ctype.h> |
| #include <linux/mutex.h> |
| #include <linux/fs.h> |
| #include <linux/file.h> |
| #include <linux/proc_fs.h> |
| #include <linux/init.h> |
| #include <linux/mm.h> |
| #include <linux/memcontrol.h> |
| #include <linux/mm_inline.h> |
| #include <linux/slab.h> |
| #include <linux/random.h> |
| #include <linux/reboot.h> |
| #include <linux/notifier.h> |
| #include <linux/kthread.h> |
| |
| #define __KERNEL_SYSCALLS__ |
| #include <linux/unistd.h> |
| #include <linux/vmalloc.h> |
| |
| #include <linux/drbd_limits.h> |
| #include "drbd_int.h" |
| #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */ |
| |
| #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 *); |
| 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 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); |
| |
| 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 (" |
| __stringify(DRBD_MINOR_COUNT_MIN) "-" __stringify(DRBD_MINOR_COUNT_MAX) ")"); |
| MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR); |
| |
| #include <linux/moduleparam.h> |
| /* allow_open_on_secondary */ |
| MODULE_PARM_DESC(allow_oos, "DONT USE!"); |
| /* thanks to these macros, if compiled into the kernel (not-module), |
| * this becomes the boot parameter drbd.minor_count */ |
| 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 |
| int enable_faults; |
| int fault_rate; |
| static int fault_count; |
| int fault_devs; |
| /* bitmap of enabled faults */ |
| module_param(enable_faults, int, 0664); |
| /* fault rate % value - applies to all enabled faults */ |
| module_param(fault_rate, int, 0664); |
| /* count of faults inserted */ |
| module_param(fault_count, int, 0664); |
| /* bitmap of devices to insert faults on */ |
| module_param(fault_devs, int, 0644); |
| #endif |
| |
| /* module parameter, defined */ |
| unsigned int minor_count = DRBD_MINOR_COUNT_DEF; |
| int disable_sendpage; |
| int 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 |
| * to run. Default is /sbin/drbdadm */ |
| char usermode_helper[80] = "/sbin/drbdadm"; |
| |
| module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0644); |
| |
| /* 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 kmem_cache *drbd_request_cache; |
| struct kmem_cache *drbd_ee_cache; /* epoch entries */ |
| struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ |
| struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ |
| mempool_t *drbd_request_mempool; |
| mempool_t *drbd_ee_mempool; |
| |
| /* I do not use a standard mempool, because: |
| 1) I want to hand out the pre-allocated objects first. |
| 2) I want to be able to interrupt sleeping allocation with a signal. |
| Note: This is a single linked list, the next pointer is the private |
| member of struct page. |
| */ |
| struct page *drbd_pp_pool; |
| spinlock_t drbd_pp_lock; |
| int drbd_pp_vacant; |
| wait_queue_head_t drbd_pp_wait; |
| |
| DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5); |
| |
| static const struct block_device_operations drbd_ops = { |
| .owner = THIS_MODULE, |
| .open = drbd_open, |
| .release = drbd_release, |
| }; |
| |
| #define ARRY_SIZE(A) (sizeof(A)/sizeof(A[0])) |
| |
| #ifdef __CHECKER__ |
| /* When checking with sparse, and this is an inline function, sparse will |
| give tons of false positives. When this is a real functions sparse works. |
| */ |
| int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins) |
| { |
| int io_allowed; |
| |
| atomic_inc(&mdev->local_cnt); |
| io_allowed = (mdev->state.disk >= mins); |
| if (!io_allowed) { |
| if (atomic_dec_and_test(&mdev->local_cnt)) |
| wake_up(&mdev->misc_wait); |
| } |
| return io_allowed; |
| } |
| |
| #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); |
| |
| 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; |
| /* never send a barrier number == 0, because that is special-cased |
| * when using TCQ for our write ordering code */ |
| new->br_number = (newest_before->br_number+1) ?: 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. |
| * @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. |
| */ |
| void tl_release(struct drbd_conf *mdev, 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; |
| |
| /* first some paranoia code */ |
| if (b == NULL) { |
| dev_err(DEV, "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); |
| 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); |
| 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_del_init(&b->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); |
| } |
| |
| spin_unlock_irq(&mdev->req_lock); |
| dec_ap_pending(mdev); |
| |
| return; |
| |
| bail: |
| spin_unlock_irq(&mdev->req_lock); |
| drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); |
| } |
| |
| |
| /** |
| * _tl_restart() - Walks the transfer log, and applies an action to all requests |
| * @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. |
| */ |
| 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); |
| } |
| } |
| |
| |
| /** |
| * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL |
| * @mdev: DRBD device. |
| * |
| * This is called after the connection to the peer was lost. The storage covered |
| * 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) |
| { |
| struct list_head *le, *tle; |
| struct drbd_request *r; |
| |
| spin_lock_irq(&mdev->req_lock); |
| |
| _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 *)); |
| |
| spin_unlock_irq(&mdev->req_lock); |
| } |
| |
| 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); |
| } |
| |
| /** |
| * 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_DISKLESS && ns.disk == D_DISKLESS))) || |
| (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); |
| static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os, |
| union drbd_state ns, const char **warn_sync_abort); |
| 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; |
| |
| 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; |
| } |
| |
| /** |
| * 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, const char **warn_sync_abort) |
| { |
| enum drbd_fencing_p fp; |
| enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max; |
| |
| 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_TEAR_DOWN) |
| 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; |
| |
| /* if we are only D_ATTACHING yet, |
| * we can (and should) go directly to D_DISKLESS. */ |
| if (ns.disk == D_FAILED && os.disk == D_ATTACHING) |
| 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_sync_abort) |
| *warn_sync_abort = |
| os.conn == C_VERIFY_S || os.conn == C_VERIFY_T ? |
| "Online-verify" : "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 { |
| dev_alert(DEV, "Connection lost while negotiating, no data!\n"); |
| 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) { |
| dev_warn(DEV, "Implicitly set disk from %s to %s\n", |
| drbd_disk_str(ns.disk), drbd_disk_str(disk_min)); |
| ns.disk = disk_min; |
| } |
| if (ns.pdsk > pdsk_max) |
| ns.pdsk = pdsk_max; |
| |
| if (ns.pdsk < pdsk_min) { |
| dev_warn(DEV, "Implicitly set pdsk from %s to %s\n", |
| drbd_disk_str(ns.pdsk), drbd_disk_str(pdsk_min)); |
| 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; |
| const char *warn_sync_abort = NULL; |
| struct after_state_chg_work *ascw; |
| |
| os = mdev->state; |
| |
| ns = sanitize_state(mdev, os, ns, &warn_sync_abort); |
| |
| 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; |
| } |
| |
| if (warn_sync_abort) |
| dev_warn(DEV, "%s aborted.\n", warn_sync_abort); |
| |
| { |
| 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_TEAR_DOWN && |
| 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); |
| |
| 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 */ |
| |
| nsm.i = -1; |
| if (ns.susp_nod) { |
| if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) |
| what = resend; |
| |
| if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING) |
| 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) { |
| tl_clear(mdev); |
| 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); |
| _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 */ |
| drbd_send_uuids(mdev); |
| drbd_send_state(mdev); |
| } |
| /* 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 (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) { |
| 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); |
| } |
| |
| /* 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); |
| |
| /* 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); |
| |
| if (os.conn != C_AHEAD && ns.conn == C_AHEAD) |
| drbd_send_state(mdev); |
| |
| /* 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; |
| int was_io_error; |
| /* corresponding get_ldev was in __drbd_set_state, to serialize |
| * our cleanup here with the transition to D_DISKLESS, |
| * so it is safe to dreference ldev here. */ |
| eh = mdev->ldev->dc.on_io_error; |
| was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags); |
| |
| /* 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 (drbd_send_state(mdev)) |
| dev_warn(DEV, "Notified peer that I am detaching my disk\n"); |
| else |
| dev_err(DEV, "Sending state for detaching disk failed\n"); |
| |
| 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); |
| |
| if (was_io_error && eh == EP_CALL_HELPER) |
| drbd_khelper(mdev, "local-io-error"); |
| } |
| |
| /* 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)); |
| |
| mdev->rs_total = 0; |
| mdev->rs_failed = 0; |
| atomic_set(&mdev->rs_pending_cnt, 0); |
| |
| if (drbd_send_state(mdev)) |
| dev_warn(DEV, "Notified peer that I'm now diskless.\n"); |
| /* 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) |
| drbd_send_state(mdev); |
| |
| /* 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); |
| |
| /* 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, NULL, |
| "write from resync_finished", BM_LOCKED_SET_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); |
| } |
| |
| drbd_md_sync(mdev); |
| } |
| |
| |
| static int drbd_thread_setup(void *arg) |
| { |
| struct drbd_thread *thi = (struct drbd_thread *) arg; |
| struct drbd_conf *mdev = thi->mdev; |
| unsigned long flags; |
| int retval; |
| |
| restart: |
| retval = thi->function(thi); |
| |
| spin_lock_irqsave(&thi->t_lock, flags); |
| |
| /* 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. |
| * 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. |
| */ |
| |
| if (thi->t_state == Restarting) { |
| dev_info(DEV, "Restarting %s\n", current->comm); |
| thi->t_state = Running; |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| goto restart; |
| } |
| |
| thi->task = NULL; |
| thi->t_state = None; |
| smp_mb(); |
| complete(&thi->stop); |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| |
| dev_info(DEV, "Terminating %s\n", current->comm); |
| |
| /* Release mod reference taken when thread was started */ |
| module_put(THIS_MODULE); |
| return retval; |
| } |
| |
| static void drbd_thread_init(struct drbd_conf *mdev, struct drbd_thread *thi, |
| int (*func) (struct drbd_thread *)) |
| { |
| spin_lock_init(&thi->t_lock); |
| thi->task = NULL; |
| thi->t_state = None; |
| thi->function = func; |
| thi->mdev = mdev; |
| } |
| |
| int drbd_thread_start(struct drbd_thread *thi) |
| { |
| struct drbd_conf *mdev = thi->mdev; |
| 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); |
| |
| /* 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"); |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| return false; |
| } |
| |
| init_completion(&thi->stop); |
| D_ASSERT(thi->task == NULL); |
| thi->reset_cpu_mask = 1; |
| 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); |
| |
| if (IS_ERR(nt)) { |
| dev_err(DEV, "Couldn't start thread\n"); |
| |
| module_put(THIS_MODULE); |
| return false; |
| } |
| spin_lock_irqsave(&thi->t_lock, flags); |
| thi->task = nt; |
| 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); |
| /* fall through */ |
| case Running: |
| case Restarting: |
| default: |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| break; |
| } |
| |
| return true; |
| } |
| |
| |
| void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait) |
| { |
| unsigned long flags; |
| |
| 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) { |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| if (restart) |
| drbd_thread_start(thi); |
| return; |
| } |
| |
| if (thi->t_state != ns) { |
| if (thi->task == NULL) { |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| return; |
| } |
| |
| thi->t_state = ns; |
| smp_mb(); |
| init_completion(&thi->stop); |
| if (thi->task != current) |
| force_sig(DRBD_SIGKILL, thi->task); |
| |
| } |
| |
| spin_unlock_irqrestore(&thi->t_lock, flags); |
| |
| if (wait) |
| wait_for_completion(&thi->stop); |
| } |
| |
| #ifdef CONFIG_SMP |
| /** |
| * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs |
| * @mdev: DRBD device. |
| * |
| * 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) |
| { |
| int ord, cpu; |
| |
| /* user override. */ |
| if (cpumask_weight(mdev->cpu_mask)) |
| return; |
| |
| ord = mdev_to_minor(mdev) % cpumask_weight(cpu_online_mask); |
| for_each_online_cpu(cpu) { |
| if (ord-- == 0) { |
| cpumask_set_cpu(cpu, mdev->cpu_mask); |
| return; |
| } |
| } |
| /* should not be reached */ |
| cpumask_setall(mdev->cpu_mask); |
| } |
| |
| /** |
| * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread |
| * @mdev: DRBD device. |
| * |
| * 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) |
| { |
| 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); |
| } |
| #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) |
| { |
| int sent, ok; |
| |
| ERR_IF(!h) return false; |
| ERR_IF(!size) return false; |
| |
| h->magic = BE_DRBD_MAGIC; |
| h->command = cpu_to_be16(cmd); |
| h->length = cpu_to_be16(size-sizeof(struct p_header80)); |
| |
| sent = drbd_send(mdev, sock, h, size, msg_flags); |
| |
| 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; |
| } |
| |
| /* 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) |
| { |
| int ok = 0; |
| struct socket *sock; |
| |
| if (use_data_socket) { |
| mutex_lock(&mdev->data.mutex); |
| sock = mdev->data.socket; |
| } else { |
| mutex_lock(&mdev->meta.mutex); |
| sock = mdev->meta.socket; |
| } |
| |
| /* 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); |
| |
| if (use_data_socket) |
| mutex_unlock(&mdev->data.mutex); |
| else |
| mutex_unlock(&mdev->meta.mutex); |
| return ok; |
| } |
| |
| int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, char *data, |
| size_t size) |
| { |
| struct p_header80 h; |
| int ok; |
| |
| h.magic = BE_DRBD_MAGIC; |
| h.command = cpu_to_be16(cmd); |
| h.length = cpu_to_be16(size); |
| |
| if (!drbd_get_data_sock(mdev)) |
| return 0; |
| |
| 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)); |
| |
| drbd_put_data_sock(mdev); |
| |
| return ok; |
| } |
| |
| int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc) |
| { |
| struct p_rs_param_95 *p; |
| struct socket *sock; |
| int size, rv; |
| const int apv = mdev->agreed_pro_version; |
| |
| size = apv <= 87 ? sizeof(struct p_rs_param) |
| : apv == 88 ? sizeof(struct p_rs_param) |
| + strlen(mdev->sync_conf.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; |
| |
| /* 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 */ |
| |
| mutex_unlock(&mdev->data.mutex); |
| |
| return rv; |
| } |
| |
| int drbd_send_protocol(struct drbd_conf *mdev) |
| { |
| struct p_protocol *p; |
| int size, cf, rv; |
| |
| size = sizeof(struct p_protocol); |
| |
| if (mdev->agreed_pro_version >= 87) |
| size += strlen(mdev->net_conf->integrity_alg) + 1; |
| |
| /* we must not recurse into our own queue, |
| * as that is blocked during handshake */ |
| p = kmalloc(size, GFP_NOIO); |
| if (p == NULL) |
| return 0; |
| |
| 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); |
| |
| 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; |
| } |
| } |
| p->conn_flags = cpu_to_be32(cf); |
| |
| if (mdev->agreed_pro_version >= 87) |
| strcpy(p->integrity_alg, mdev->net_conf->integrity_alg); |
| |
| rv = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_PROTOCOL, |
| (struct p_header80 *)p, size); |
| kfree(p); |
| return rv; |
| } |
| |
| int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags) |
| { |
| struct p_uuids p; |
| int i; |
| |
| if (!get_ldev_if_state(mdev, D_NEGOTIATING)) |
| return 1; |
| |
| for (i = UI_CURRENT; i < UI_SIZE; i++) |
| p.uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0; |
| |
| 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; |
| 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); |
| |
| put_ldev(mdev); |
| |
| return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_UUIDS, |
| (struct p_header80 *)&p, sizeof(p)); |
| } |
| |
| int drbd_send_uuids(struct drbd_conf *mdev) |
| { |
| return _drbd_send_uuids(mdev, 0); |
| } |
| |
| int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev) |
| { |
| return _drbd_send_uuids(mdev, 8); |
| } |
| |
| void drbd_print_uuids(struct drbd_conf *mdev, const char *text) |
| { |
| if (get_ldev_if_state(mdev, D_NEGOTIATING)) { |
| u64 *uuid = mdev->ldev->md.uuid; |
| dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX\n", |
| text, |
| (unsigned long long)uuid[UI_CURRENT], |
| (unsigned long long)uuid[UI_BITMAP], |
| (unsigned long long)uuid[UI_HISTORY_START], |
| (unsigned long long)uuid[UI_HISTORY_END]); |
| put_ldev(mdev); |
| } else { |
| dev_info(DEV, "%s effective data uuid: %016llX\n", |
| text, |
| (unsigned long long)mdev->ed_uuid); |
| } |
| } |
| |
| int drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev) |
| { |
| struct p_rs_uuid p; |
| u64 uuid; |
| |
| D_ASSERT(mdev->state.disk == D_UP_TO_DATE); |
| |
| uuid = mdev->ldev->md.uuid[UI_BITMAP] + UUID_NEW_BM_OFFSET; |
| 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)); |
| } |
| |
| int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags) |
| { |
| struct p_sizes p; |
| sector_t d_size, u_size; |
| int q_order_type, 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; |
| 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_t(int, max_bio_size, DRBD_MAX_BIO_SIZE); |
| put_ldev(mdev); |
| } else { |
| d_size = 0; |
| u_size = 0; |
| q_order_type = QUEUE_ORDERED_NONE; |
| max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */ |
| } |
| |
| 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); |
| |
| ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SIZES, |
| (struct p_header80 *)&p, sizeof(p)); |
| return ok; |
| } |
| |
| /** |
| * drbd_send_state() - Sends the drbd state to the peer |
| * @mdev: DRBD device. |
| */ |
| int drbd_send_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; |
| |
| 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; |
| } |
| |
| int drbd_send_state_req(struct drbd_conf *mdev, |
| union drbd_state mask, union drbd_state val) |
| { |
| struct p_req_state p; |
| |
| p.mask = cpu_to_be32(mask.i); |
| p.val = cpu_to_be32(val.i); |
| |
| return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_STATE_CHG_REQ, |
| (struct p_header80 *)&p, sizeof(p)); |
| } |
| |
| int drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode) |
| { |
| struct p_req_state_reply p; |
| |
| p.retcode = cpu_to_be32(retcode); |
| |
| return drbd_send_cmd(mdev, USE_META_SOCKET, P_STATE_CHG_REPLY, |
| (struct p_header80 *)&p, sizeof(p)); |
| } |
| |
| int fill_bitmap_rle_bits(struct drbd_conf *mdev, |
| struct p_compressed_bm *p, |
| struct bm_xfer_ctx *c) |
| { |
| struct bitstream bs; |
| unsigned long plain_bits; |
| unsigned long tmp; |
| unsigned long rl; |
| unsigned len; |
| unsigned toggle; |
| int bits; |
| |
| /* may we use this feature? */ |
| if ((mdev->sync_conf.use_rle == 0) || |
| (mdev->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); |
| /* plain bits covered in this code string */ |
| plain_bits = 0; |
| |
| /* p->encoding & 0x80 stores whether the first run length is set. |
| * bit offset is implicit. |
| * start with toggle == 2 to be able to tell the first iteration */ |
| toggle = 2; |
| |
| /* see how much plain bits we can stuff into one packet |
| * using RLE and VLI. */ |
| do { |
| tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset) |
| : _drbd_bm_find_next(mdev, c->bit_offset); |
| if (tmp == -1UL) |
| tmp = c->bm_bits; |
| rl = tmp - c->bit_offset; |
| |
| if (toggle == 2) { /* first iteration */ |
| if (rl == 0) { |
| /* the first checked bit was set, |
| * store start value, */ |
| DCBP_set_start(p, 1); |
| /* but skip encoding of zero run length */ |
| toggle = !toggle; |
| continue; |
| } |
| DCBP_set_start(p, 0); |
| } |
| |
| /* paranoia: catch zero runlength. |
| * can only happen if bitmap is modified while we scan it. */ |
| if (rl == 0) { |
| dev_err(DEV, "unexpected zero runlength while encoding bitmap " |
| "t:%u bo:%lu\n", toggle, c->bit_offset); |
| return -1; |
| } |
| |
| bits = vli_encode_bits(&bs, rl); |
| if (bits == -ENOBUFS) /* buffer full */ |
| break; |
| if (bits <= 0) { |
| dev_err(DEV, "error while encoding bitmap: %d\n", bits); |
| return 0; |
| } |
| |
| toggle = !toggle; |
| plain_bits += rl; |
| c->bit_offset = tmp; |
| } while (c->bit_offset < c->bm_bits); |
| |
| len = bs.cur.b - p->code + !!bs.cur.bit; |
| |
| if (plain_bits < (len << 3)) { |
| /* incompressible with this method. |
| * we need to rewind both word and bit position. */ |
| c->bit_offset -= plain_bits; |
| bm_xfer_ctx_bit_to_word_offset(c); |
| c->bit_offset = c->word_offset * BITS_PER_LONG; |
| return 0; |
| } |
| |
| /* RLE + VLI was able to compress it just fine. |
| * update c->word_offset. */ |
| bm_xfer_ctx_bit_to_word_offset(c); |
| |
| /* store pad_bits */ |
| DCBP_set_pad_bits(p, (8 - bs.cur.bit) & 0x7); |
| |
| return len; |
| } |
| |
| /** |
| * send_bitmap_rle_or_plain |
| * |
| * Return 0 when done, 1 when another iteration is needed, and a negative error |
| * code upon failure. |
| */ |
| static int |
| send_bitmap_rle_or_plain(struct drbd_conf *mdev, |
| struct p_header80 *h, 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); |
| |
| 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); |
| |
| c->packets[0]++; |
| c->bytes[0] += 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); |
| 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); |
| 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; |
| |
| if (c->bit_offset > c->bm_bits) |
| c->bit_offset = c->bm_bits; |
| } |
| if (ok) { |
| if (len == 0) { |
| INFO_bm_xfer_stats(mdev, "send", c); |
| return 0; |
| } else |
| return 1; |
| } |
| return -EIO; |
| } |
| |
| /* See the comment at receive_bitmap() */ |
| 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__); |
| return false; |
| } |
| |
| if (get_ldev(mdev)) { |
| if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { |
| dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n"); |
| drbd_bm_set_all(mdev); |
| if (drbd_bm_write(mdev)) { |
| /* write_bm did fail! Leave full sync flag set in Meta P_DATA |
| * but otherwise process as per normal - need to tell other |
| * side that a full resync is required! */ |
| dev_err(DEV, "Failed to write bitmap to disk!\n"); |
| } else { |
| drbd_md_clear_flag(mdev, MDF_FULL_SYNC); |
| drbd_md_sync(mdev); |
| } |
| } |
| put_ldev(mdev); |
| } |
| |
| c = (struct bm_xfer_ctx) { |
| .bm_bits = drbd_bm_bits(mdev), |
| .bm_words = drbd_bm_words(mdev), |
| }; |
| |
| do { |
| err = send_bitmap_rle_or_plain(mdev, p, &c); |
| } while (err > 0); |
| |
| free_page((unsigned long) p); |
| return err == 0; |
| } |
| |
| int drbd_send_bitmap(struct drbd_conf *mdev) |
| { |
| int err; |
| |
| if (!drbd_get_data_sock(mdev)) |
| return -1; |
| err = !_drbd_send_bitmap(mdev); |
| drbd_put_data_sock(mdev); |
| return err; |
| } |
| |
| int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size) |
| { |
| int ok; |
| struct p_barrier_ack p; |
| |
| p.barrier = barrier_nr; |
| p.set_size = cpu_to_be32(set_size); |
| |
| 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; |
| } |
| |
| /** |
| * _drbd_send_ack() - Sends an ack packet |
| * @mdev: DRBD device. |
| * @cmd: Packet command code. |
| * @sector: sector, needs to be in big endian byte order |
| * @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) |
| { |
| int ok; |
| 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->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; |
| } |
| |
| /* 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) |
| { |
| 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); |
| } |
| |
| int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd, |
| struct p_block_req *rp) |
| { |
| return _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. |
| */ |
| int drbd_send_ack(struct drbd_conf *mdev, |
| enum drbd_packets cmd, struct drbd_epoch_entry *e) |
| { |
| return _drbd_send_ack(mdev, cmd, |
| cpu_to_be64(e->sector), |
| cpu_to_be32(e->size), |
| e->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, |
| sector_t sector, int blksize, u64 block_id) |
| { |
| return _drbd_send_ack(mdev, cmd, |
| cpu_to_be64(sector), |
| cpu_to_be32(blksize), |
| cpu_to_be64(block_id)); |
| } |
| |
| 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); |
| |
| ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd, |
| (struct p_header80 *)&p, sizeof(p)); |
| return ok; |
| } |
| |
| int drbd_send_drequest_csum(struct drbd_conf *mdev, |
| sector_t sector, int size, |
| void *digest, int digest_size, |
| enum drbd_packets 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); |
| |
| mutex_lock(&mdev->data.mutex); |
| |
| 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; |
| } |
| |
| int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size) |
| { |
| int ok; |
| 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; |
| } |
| |
| /* 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) |
| { |
| 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; |
| |
| if (drop_it) |
| return true; |
| |
| drop_it = !--mdev->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); |
| } |
| |
| return drop_it; /* && (mdev->state == R_PRIMARY) */; |
| } |
| |
| /* 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. |
| * |
| * As soon as the page was really sent over the network put_page() |
| * gets called by some part of the network layer. [ NIC driver? ] |
| * |
| * [ get_page() / put_page() increment/decrement the count. If count |
| * reaches 0 the page will be freed. ] |
| * |
| * This works nicely with pages from FSs. |
| * But this means that in protocol A we might signal IO completion too early! |
| * |
| * In order not to corrupt data during a resync we must make sure |
| * that we do not reuse our own buffer pages (EEs) to early, therefore |
| * we have the net_ee list. |
| * |
| * XFS seems to have problems, still, it submits pages with page_count == 0! |
| * As a workaround, we disable sendpage on pages |
| * 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 sent = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, msg_flags); |
| kunmap(page); |
| if (sent == size) |
| mdev->send_cnt += size>>9; |
| return sent == size; |
| } |
| |
| static int _drbd_send_page(struct drbd_conf *mdev, struct page *page, |
| int offset, size_t size, unsigned msg_flags) |
| { |
| mm_segment_t oldfs = get_fs(); |
| int sent, ok; |
| int len = size; |
| |
| /* e.g. XFS meta- & log-data is in slab pages, which have a |
| * page_count of 0 and/or have PageSlab() set. |
| * we cannot use send_page for those, as that does get_page(); |
| * put_page(); and would cause either a VM_BUG directly, or |
| * __page_cache_release a page that would actually still be referenced |
| * by someone, leading to some obscure delayed Oops somewhere else. */ |
| if (disable_sendpage || (page_count(page) < 1) || PageSlab(page)) |
| return _drbd_no_send_page(mdev, page, offset, size, msg_flags); |
| |
| msg_flags |= MSG_NOSIGNAL; |
| drbd_update_congested(mdev); |
| 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; |
| } |
| if (sent <= 0) { |
| dev_warn(DEV, "%s: size=%d len=%d sent=%d\n", |
| __func__, (int)size, len, sent); |
| break; |
| } |
| len -= sent; |
| offset += sent; |
| } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/); |
| set_fs(oldfs); |
| clear_bit(NET_CONGESTED, &mdev->flags); |
| |
| ok = (len == 0); |
| if (likely(ok)) |
| mdev->send_cnt += size>>9; |
| return ok; |
| } |
| |
| static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio) |
| { |
| struct bio_vec *bvec; |
| int i; |
| /* hint all but last page with MSG_MORE */ |
| __bio_for_each_segment(bvec, bio, i, 0) { |
| 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; |
| } |
| return 1; |
| } |
| |
| static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio) |
| { |
| struct bio_vec *bvec; |
| int i; |
| /* hint all but last page with MSG_MORE */ |
| __bio_for_each_segment(bvec, bio, i, 0) { |
| if (!_drbd_send_page(mdev, bvec->bv_page, |
| bvec->bv_offset, bvec->bv_len, |
| i == bio->bi_vcnt -1 ? 0 : MSG_MORE)) |
| return 0; |
| } |
| return 1; |
| } |
| |
| static int _drbd_send_zc_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e) |
| { |
| struct page *page = e->pages; |
| unsigned len = e->size; |
| /* 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; |
| len -= l; |
| } |
| return 1; |
| } |
| |
| static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw) |
| { |
| if (mdev->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) | |
| (bi_rw & REQ_DISCARD ? DP_DISCARD : 0); |
| else |
| return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0; |
| } |
| |
| /* Used to send write requests |
| * R_PRIMARY -> Peer (P_DATA) |
| */ |
| int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req) |
| { |
| int ok = 1; |
| struct p_data p; |
| unsigned int dp_flags = 0; |
| void *dgb; |
| int dgs; |
| |
| 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(req->seq_num = |
| atomic_add_return(1, &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) { |
| /* 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 |
| * pages may become invalid. |
| * |
| * For data-integrity enabled, we copy it as well, so we can be |
| * sure that even if the bio pages may still be modified, it |
| * won't change the data on the wire, thus if the digest checks |
| * 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); |
| else |
| ok = _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)) { |
| dev_warn(DEV, |
| "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n", |
| (unsigned long long)req->sector, req->size); |
| } |
| } /* else if (dgs > 64) { |
| ... Be noisy about digest too large ... |
| } */ |
| } |
| |
| drbd_put_data_sock(mdev); |
| |
| return ok; |
| } |
| |
| /* 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 ok; |
| struct p_data p; |
| void *dgb; |
| 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; |
| |
| 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); |
| |
| drbd_put_data_sock(mdev); |
| |
| return ok; |
| } |
| |
| int drbd_send_oos(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); |
| |
| return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OUT_OF_SYNC, &p.head, sizeof(p)); |
| } |
| |
| /* |
| drbd_send distinguishes two cases: |
| |
| Packets sent via the data socket "sock" |
| and packets sent via the meta data socket "msock" |
| |
| sock msock |
| -----------------+-------------------------+------------------------------ |
| timeout conf.timeout / 2 conf.timeout / 2 |
| timeout action send a ping via msock Abort communication |
| and close all sockets |
| */ |
| |
| /* |
| * you must have down()ed the appropriate [m]sock_mutex elsewhere! |
| */ |
| int drbd_send(struct drbd_conf *mdev, struct socket *sock, |
| void *buf, size_t size, unsigned msg_flags) |
| { |
| struct kvec iov; |
| struct msghdr msg; |
| int rv, sent = 0; |
| |
| if (!sock) |
| return -1000; |
| |
| /* THINK if (signal_pending) return ... ? */ |
| |
| iov.iov_base = buf; |
| iov.iov_len = size; |
| |
| msg.msg_name = NULL; |
| msg.msg_namelen = 0; |
| msg.msg_control = NULL; |
| 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); |
| } |
| do { |
| /* STRANGE |
| * tcp_sendmsg does _not_ use its size parameter at all ? |
| * |
| * -EAGAIN on timeout, -EINTR on signal. |
| */ |
| /* THINK |
| * do we need to block DRBD_SIG if sock == &meta.socket ?? |
| * otherwise wake_asender() might interrupt some send_*Ack ! |
| */ |
| rv = kernel_sendmsg(sock, &msg, &iov, 1, size); |
| if (rv == -EAGAIN) { |
| if (we_should_drop_the_connection(mdev, sock)) |
| break; |
| else |
| continue; |
| } |
| D_ASSERT(rv != 0); |
| if (rv == -EINTR) { |
| flush_signals(current); |
| rv = 0; |
| } |
| if (rv < 0) |
| break; |
| sent += rv; |
| iov.iov_base += rv; |
| iov.iov_len -= rv; |
| } while (sent < size); |
| |
| if (sock == mdev->data.socket) |
| clear_bit(NET_CONGESTED, &mdev->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)); |
| } else |
| drbd_force_state(mdev, NS(conn, C_TIMEOUT)); |
| } |
| |
| return sent; |
| } |
| |
| static int drbd_open(struct block_device *bdev, fmode_t mode) |
| { |
| struct drbd_conf *mdev = bdev->bd_disk->private_data; |
| unsigned long flags; |
| int rv = 0; |
| |
| mutex_lock(&drbd_main_mutex); |
| spin_lock_irqsave(&mdev->req_lock, flags); |
| /* to have a stable mdev->state.role |
| * and no race with updating open_cnt */ |
| |
| if (mdev->state.role != R_PRIMARY) { |
| if (mode & FMODE_WRITE) |
| rv = -EROFS; |
| else if (!allow_oos) |
| rv = -EMEDIUMTYPE; |
| } |
| |
| if (!rv) |
| mdev->open_cnt++; |
| spin_unlock_irqrestore(&mdev->req_lock, flags); |
| mutex_unlock(&drbd_main_mutex); |
| |
| return rv; |
| } |
| |
| static int drbd_release(struct gendisk *gd, fmode_t mode) |
| { |
| struct drbd_conf *mdev = gd->private_data; |
| mutex_lock(&drbd_main_mutex); |
| mdev->open_cnt--; |
| mutex_unlock(&drbd_main_mutex); |
| return 0; |
| } |
| |
| 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) { |
| { .role = R_SECONDARY, |
| .peer = R_UNKNOWN, |
| .conn = C_STANDALONE, |
| .disk = D_DISKLESS, |
| .pdsk = D_UNKNOWN, |
| .susp = 0, |
| .susp_nod = 0, |
| .susp_fen = 0 |
|