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    Subject[PATCH 061/118] drbd: Moved the state functions into its own source file
    Date
    Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
    Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
    ---
    drivers/block/drbd/Makefile | 2 +-
    drivers/block/drbd/drbd_int.h | 46 +--
    drivers/block/drbd/drbd_main.c | 1179 +-------------------------------------
    drivers/block/drbd/drbd_state.c | 1217 +++++++++++++++++++++++++++++++++++++++
    drivers/block/drbd/drbd_state.h | 101 ++++
    5 files changed, 1326 insertions(+), 1219 deletions(-)
    create mode 100644 drivers/block/drbd/drbd_state.c
    create mode 100644 drivers/block/drbd/drbd_state.h

    diff --git a/drivers/block/drbd/Makefile b/drivers/block/drbd/Makefile
    index cacbb04..06fb445 100644
    --- a/drivers/block/drbd/Makefile
    +++ b/drivers/block/drbd/Makefile
    @@ -1,6 +1,6 @@
    drbd-y := drbd_bitmap.o drbd_proc.o
    drbd-y += drbd_worker.o drbd_receiver.o drbd_req.o drbd_actlog.o
    drbd-y += drbd_main.o drbd_strings.o drbd_nl.o
    -drbd-y += drbd_interval.o
    +drbd-y += drbd_interval.o drbd_state.o

    obj-$(CONFIG_BLK_DEV_DRBD) += drbd.o
    diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
    index f934aa2..2c18cf3 100644
    --- a/drivers/block/drbd/drbd_int.h
    +++ b/drivers/block/drbd/drbd_int.h
    @@ -43,6 +43,8 @@
    #include <net/tcp.h>
    #include <linux/lru_cache.h>
    #include <linux/prefetch.h>
    +#include <linux/drbd.h>
    +#include "drbd_state.h"

    #ifdef __CHECKER__
    # define __protected_by(x) __attribute__((require_context(x,1,999,"rdwr")))
    @@ -1120,35 +1122,12 @@ static inline void drbd_put_data_sock(struct drbd_conf *mdev)

    /* drbd_main.c */

    -enum chg_state_flags {
    - CS_HARD = 1,
    - CS_VERBOSE = 2,
    - CS_WAIT_COMPLETE = 4,
    - CS_SERIALIZE = 8,
    - CS_ORDERED = CS_WAIT_COMPLETE + CS_SERIALIZE,
    -};
    -
    enum dds_flags {
    DDSF_FORCED = 1,
    DDSF_NO_RESYNC = 2, /* Do not run a resync for the new space */
    };

    extern void drbd_init_set_defaults(struct drbd_conf *mdev);
    -extern enum drbd_state_rv drbd_change_state(struct drbd_conf *mdev,
    - enum chg_state_flags f,
    - union drbd_state mask,
    - union drbd_state val);
    -extern void drbd_force_state(struct drbd_conf *, union drbd_state,
    - union drbd_state);
    -extern enum drbd_state_rv _drbd_request_state(struct drbd_conf *,
    - union drbd_state,
    - union drbd_state,
    - enum chg_state_flags);
    -extern enum drbd_state_rv __drbd_set_state(struct drbd_conf *, union drbd_state,
    - enum chg_state_flags,
    - struct completion *done);
    -extern void print_st_err(struct drbd_conf *, union drbd_state,
    - union drbd_state, int);
    extern int drbd_thread_start(struct drbd_thread *thi);
    extern void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait);
    #ifdef CONFIG_SMP
    @@ -1712,6 +1691,10 @@ static inline int drbd_ee_has_active_page(struct drbd_peer_request *peer_req)
    }


    +
    +
    +
    +
    static inline void drbd_state_lock(struct drbd_conf *mdev)
    {
    wait_event(mdev->misc_wait,
    @@ -1737,23 +1720,6 @@ _drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
    return rv;
    }

    -/**
    - * drbd_request_state() - Reqest a state change
    - * @mdev: DRBD device.
    - * @mask: mask of state bits to change.
    - * @val: value of new state bits.
    - *
    - * This is the most graceful way of requesting a state change. It is verbose
    - * quite verbose in case the state change is not possible, and all those
    - * state changes are globally serialized.
    - */
    -static inline int drbd_request_state(struct drbd_conf *mdev,
    - union drbd_state mask,
    - union drbd_state val)
    -{
    - return _drbd_request_state(mdev, mask, val, CS_VERBOSE + CS_ORDERED);
    -}
    -
    #define __drbd_chk_io_error(m,f) __drbd_chk_io_error_(m,f, __func__)
    static inline void __drbd_chk_io_error_(struct drbd_conf *mdev, int forcedetach, const char *where)
    {
    diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
    index 44be1f2..ccd57a9 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 *);
    @@ -72,9 +64,6 @@ 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);
    @@ -340,7 +329,7 @@ bail:
    * @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)
    +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;
    @@ -450,1172 +439,6 @@ void tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
    spin_unlock_irq(&mdev->tconn->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->tconn->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->tconn->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->tconn->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->tconn->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->tconn->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->tconn->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->tconn->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->tconn->req_lock, flags);
    -
    - if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) {
    - D_ASSERT(current != mdev->tconn->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->tconn)) {
    - if (!mdev->tconn->net_conf->two_primaries &&
    - ns.role == R_PRIMARY && ns.peer == R_PRIMARY)
    - rv = SS_TWO_PRIMARIES;
    - put_net_conf(mdev->tconn);
    - }
    -
    - 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->tconn->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->tconn->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->tconn->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->tconn->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->tconn->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->tconn->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->tconn->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->tconn->req_lock);
    - _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL);
    - spin_unlock_irq(&mdev->tconn->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->tconn->req_lock);
    - _tl_restart(mdev, what);
    - nsm.i &= mdev->state.i;
    - _drbd_set_state(mdev, nsm, CS_VERBOSE, NULL);
    - spin_unlock_irq(&mdev->tconn->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->tconn->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);
    - }
    -
    - /* Upon network connection, we need to start the receiver */
    - if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED)
    - drbd_thread_start(&mdev->tconn->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->tconn->worker);
    - }
    -
    - drbd_md_sync(mdev);
    -}
    -
    -
    static int drbd_thread_setup(void *arg)
    {
    struct drbd_thread *thi = (struct drbd_thread *) arg;
    diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
    new file mode 100644
    index 0000000..38d330b
    --- /dev/null
    +++ b/drivers/block/drbd/drbd_state.c
    @@ -0,0 +1,1217 @@
    +/*
    + drbd_state.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/drbd_limits.h>
    +#include "drbd_int.h"
    +#include "drbd_req.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;
    +};
    +
    +
    +extern void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what);
    +int drbd_send_state_req(struct drbd_conf *, union drbd_state, union drbd_state);
    +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 void after_conn_state_ch(struct drbd_tconn *tconn, union drbd_state os,
    + union drbd_state ns, enum chg_state_flags flags);
    +static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state);
    +static enum drbd_state_rv is_valid_soft_transition(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);
    +
    +/**
    + * 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->tconn->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->tconn->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
    +_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->tconn->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_soft_transition(os, ns);
    + if (rv == SS_SUCCESS)
    + rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
    + }
    + }
    + spin_unlock_irqrestore(&mdev->tconn->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->tconn->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_soft_transition(os, ns);
    + spin_unlock_irqrestore(&mdev->tconn->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->tconn->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->tconn->req_lock, flags);
    +
    + if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) {
    + D_ASSERT(current != mdev->tconn->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%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' : '-',
    + ns.susp_fen ? 'F' : '-',
    + ns.susp_nod ? 'N' : '-'
    + );
    +}
    +
    +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->tconn)) {
    + if (!mdev->tconn->net_conf->two_primaries &&
    + ns.role == R_PRIMARY && ns.peer == R_PRIMARY)
    + rv = SS_TWO_PRIMARIES;
    + put_net_conf(mdev->tconn);
    + }
    +
    + 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->tconn->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_soft_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_soft_transition(union drbd_state os, union drbd_state ns)
    +{
    + 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;
    +}
    +
    +void drbd_resume_al(struct drbd_conf *mdev)
    +{
    + if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags))
    + dev_info(DEV, "Resumed AL updates\n");
    +}
    +
    +/* helper for __drbd_set_state */
    +static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs)
    +{
    + if (mdev->tconn->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;
    +}
    +
    +/**
    + * __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_soft_transition(os, ns);
    + } else
    + rv = is_valid_soft_transition(os, ns);
    + }
    +
    + 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->tconn->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->tconn->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->tconn->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->tconn->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->tconn->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->tconn->req_lock);
    + _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL);
    + spin_unlock_irq(&mdev->tconn->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->tconn->req_lock);
    + _tl_restart(mdev, what);
    + nsm.i &= mdev->state.i;
    + _drbd_set_state(mdev, nsm, CS_VERBOSE, NULL);
    + spin_unlock_irq(&mdev->tconn->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->tconn->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);
    + }
    +
    + if (ns.disk == D_DISKLESS &&
    + ns.conn == C_STANDALONE &&
    + ns.role == R_SECONDARY) {
    + if (os.aftr_isp != ns.aftr_isp)
    + resume_next_sg(mdev);
    + }
    +
    + after_conn_state_ch(mdev->tconn, os, ns, flags);
    + drbd_md_sync(mdev);
    +}
    +
    +static void after_conn_state_ch(struct drbd_tconn *tconn, union drbd_state os,
    + union drbd_state ns, enum chg_state_flags flags)
    +{
    + /* Upon network configuration, we need to start the receiver */
    + if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED)
    + drbd_thread_start(&tconn->receiver);
    +
    + if (ns.disk == D_DISKLESS &&
    + ns.conn == C_STANDALONE &&
    + ns.role == R_SECONDARY) {
    + /* if (test_bit(DEVICE_DYING, &mdev->flags)) TODO: DEVICE_DYING functionality */
    + drbd_thread_stop_nowait(&tconn->worker);
    + }
    +}
    diff --git a/drivers/block/drbd/drbd_state.h b/drivers/block/drbd/drbd_state.h
    new file mode 100644
    index 0000000..3ec26e2
    --- /dev/null
    +++ b/drivers/block/drbd/drbd_state.h
    @@ -0,0 +1,101 @@
    +#ifndef DRBD_STATE_H
    +#define DRBD_STATE_H
    +
    +struct drbd_conf;
    +
    +/**
    + * DOC: DRBD State macros
    + *
    + * These macros are used to express state changes in easily readable form.
    + *
    + * The NS macros expand to a mask and a value, that can be bit ored onto the
    + * current state as soon as the spinlock (req_lock) was taken.
    + *
    + * The _NS macros are used for state functions that get called with the
    + * spinlock. These macros expand directly to the new state value.
    + *
    + * Besides the basic forms NS() and _NS() additional _?NS[23] are defined
    + * to express state changes that affect more than one aspect of the state.
    + *
    + * E.g. NS2(conn, C_CONNECTED, peer, R_SECONDARY)
    + * Means that the network connection was established and that the peer
    + * is in secondary role.
    + */
    +#define role_MASK R_MASK
    +#define peer_MASK R_MASK
    +#define disk_MASK D_MASK
    +#define pdsk_MASK D_MASK
    +#define conn_MASK C_MASK
    +#define susp_MASK 1
    +#define user_isp_MASK 1
    +#define aftr_isp_MASK 1
    +#define susp_nod_MASK 1
    +#define susp_fen_MASK 1
    +
    +#define NS(T, S) \
    + ({ union drbd_state mask; mask.i = 0; mask.T = T##_MASK; mask; }), \
    + ({ union drbd_state val; val.i = 0; val.T = (S); val; })
    +#define NS2(T1, S1, T2, S2) \
    + ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \
    + mask.T2 = T2##_MASK; mask; }), \
    + ({ union drbd_state val; val.i = 0; val.T1 = (S1); \
    + val.T2 = (S2); val; })
    +#define NS3(T1, S1, T2, S2, T3, S3) \
    + ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \
    + mask.T2 = T2##_MASK; mask.T3 = T3##_MASK; mask; }), \
    + ({ union drbd_state val; val.i = 0; val.T1 = (S1); \
    + val.T2 = (S2); val.T3 = (S3); val; })
    +
    +#define _NS(D, T, S) \
    + D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T = (S); __ns; })
    +#define _NS2(D, T1, S1, T2, S2) \
    + D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \
    + __ns.T2 = (S2); __ns; })
    +#define _NS3(D, T1, S1, T2, S2, T3, S3) \
    + D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \
    + __ns.T2 = (S2); __ns.T3 = (S3); __ns; })
    +
    +enum chg_state_flags {
    + CS_HARD = 1,
    + CS_VERBOSE = 2,
    + CS_WAIT_COMPLETE = 4,
    + CS_SERIALIZE = 8,
    + CS_ORDERED = CS_WAIT_COMPLETE + CS_SERIALIZE,
    +};
    +
    +extern enum drbd_state_rv drbd_change_state(struct drbd_conf *mdev,
    + enum chg_state_flags f,
    + union drbd_state mask,
    + union drbd_state val);
    +extern void drbd_force_state(struct drbd_conf *, union drbd_state,
    + union drbd_state);
    +extern enum drbd_state_rv _drbd_request_state(struct drbd_conf *,
    + union drbd_state,
    + union drbd_state,
    + enum chg_state_flags);
    +extern enum drbd_state_rv __drbd_set_state(struct drbd_conf *, union drbd_state,
    + enum chg_state_flags,
    + struct completion *done);
    +extern void print_st_err(struct drbd_conf *, union drbd_state,
    + union drbd_state, int);
    +
    +extern void drbd_resume_al(struct drbd_conf *mdev);
    +
    +/**
    + * drbd_request_state() - Reqest a state change
    + * @mdev: DRBD device.
    + * @mask: mask of state bits to change.
    + * @val: value of new state bits.
    + *
    + * This is the most graceful way of requesting a state change. It is verbose
    + * quite verbose in case the state change is not possible, and all those
    + * state changes are globally serialized.
    + */
    +static inline int drbd_request_state(struct drbd_conf *mdev,
    + union drbd_state mask,
    + union drbd_state val)
    +{
    + return _drbd_request_state(mdev, mask, val, CS_VERBOSE + CS_ORDERED);
    +}
    +
    +#endif
    --
    1.7.4.1


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