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Subject[PATCH 45/54] drbd: Make all command handlers return 0 upon success and an error code otherwise
Date
From: Andreas Gruenbacher <agruen@linbit.com>

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
---
drivers/block/drbd/drbd_receiver.c | 177 +++++++++++++++++++-----------------
1 files changed, 93 insertions(+), 84 deletions(-)

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index e6b6e01..795d86e 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1248,7 +1248,7 @@ static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packet cmd,
switch (mdev->write_ordering) {
case WO_none:
if (rv == FE_RECYCLED)
- return true;
+ return 0;

/* receiver context, in the writeout path of the other node.
* avoid potential distributed deadlock */
@@ -1276,10 +1276,10 @@ static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packet cmd,
D_ASSERT(atomic_read(&epoch->active) == 0);
D_ASSERT(epoch->flags == 0);

- return true;
+ return 0;
default:
dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering);
- return false;
+ return -EIO;
}

epoch->flags = 0;
@@ -1297,7 +1297,7 @@ static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packet cmd,
}
spin_unlock(&mdev->epoch_lock);

- return true;
+ return 0;
}

/* used from receive_RSDataReply (recv_resync_read)
@@ -1566,7 +1566,7 @@ static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packet cmd,
{
struct drbd_request *req;
sector_t sector;
- int ok;
+ int err;
struct p_data *p = &mdev->tconn->data.rbuf.data;

sector = be64_to_cpu(p->sector);
@@ -1575,27 +1575,26 @@ static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packet cmd,
req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__);
spin_unlock_irq(&mdev->tconn->req_lock);
if (unlikely(!req))
- return false;
+ return -EIO;

/* hlist_del(&req->collision) is done in _req_may_be_done, to avoid
* special casing it there for the various failure cases.
* still no race with drbd_fail_pending_reads */
- ok = !recv_dless_read(mdev, req, sector, data_size);
-
- if (ok)
+ err = recv_dless_read(mdev, req, sector, data_size);
+ if (!err)
req_mod(req, DATA_RECEIVED);
/* else: nothing. handled from drbd_disconnect...
* I don't think we may complete this just yet
* in case we are "on-disconnect: freeze" */

- return ok;
+ return err;
}

static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packet cmd,
unsigned int data_size)
{
sector_t sector;
- int ok;
+ int err;
struct p_data *p = &mdev->tconn->data.rbuf.data;

sector = be64_to_cpu(p->sector);
@@ -1605,19 +1604,19 @@ static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packet cmd,
/* data is submitted to disk within recv_resync_read.
* corresponding put_ldev done below on error,
* or in drbd_peer_request_endio. */
- ok = !recv_resync_read(mdev, sector, data_size);
+ err = recv_resync_read(mdev, sector, data_size);
} else {
if (__ratelimit(&drbd_ratelimit_state))
dev_err(DEV, "Can not write resync data to local disk.\n");

- ok = !drbd_drain_block(mdev, data_size);
+ err = drbd_drain_block(mdev, data_size);

drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size);
}

atomic_add(data_size >> 9, &mdev->rs_sect_in);

- return ok;
+ return err;
}

static int w_restart_write(struct drbd_work *w, int cancel)
@@ -1991,12 +1990,16 @@ static int receive_Data(struct drbd_conf *mdev, enum drbd_packet cmd,
u32 dp_flags;
int err;

-
if (!get_ldev(mdev)) {
+ int err2;
+
err = wait_for_and_update_peer_seq(mdev, peer_seq);
drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size);
atomic_inc(&mdev->current_epoch->epoch_size);
- return !drbd_drain_block(mdev, data_size) && err == 0;
+ err2 = drbd_drain_block(mdev, data_size);
+ if (!err)
+ err = err2;
+ return err;
}

/*
@@ -2009,7 +2012,7 @@ static int receive_Data(struct drbd_conf *mdev, enum drbd_packet cmd,
peer_req = read_in_block(mdev, p->block_id, sector, data_size);
if (!peer_req) {
put_ldev(mdev);
- return false;
+ return -EIO;
}

peer_req->w.cb = e_end_block;
@@ -2036,7 +2039,7 @@ static int receive_Data(struct drbd_conf *mdev, enum drbd_packet cmd,
spin_unlock_irq(&mdev->tconn->req_lock);
if (err == -ENOENT) {
put_ldev(mdev);
- return true;
+ return 0;
}
goto out_interrupted;
}
@@ -2069,8 +2072,9 @@ static int receive_Data(struct drbd_conf *mdev, enum drbd_packet cmd,
drbd_al_begin_io(mdev, peer_req->i.sector);
}

- if (drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR) == 0)
- return true;
+ err = drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR);
+ if (!err)
+ return 0;

/* don't care for the reason here */
dev_err(DEV, "submit failed, triggering re-connect\n");
@@ -2085,7 +2089,7 @@ out_interrupted:
drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + EV_CLEANUP);
put_ldev(mdev);
drbd_free_ee(mdev, peer_req);
- return false;
+ return err;
}

/* We may throttle resync, if the lower device seems to be busy,
@@ -2172,12 +2176,12 @@ static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packet cmd,
if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) {
dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
(unsigned long long)sector, size);
- return false;
+ return -EINVAL;
}
if (sector + (size>>9) > capacity) {
dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
(unsigned long long)sector, size);
- return false;
+ return -EINVAL;
}

if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) {
@@ -2205,7 +2209,7 @@ static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packet cmd,
"no local data.\n");

/* drain possibly payload */
- return !drbd_drain_block(mdev, digest_size);
+ return drbd_drain_block(mdev, digest_size);
}

/* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
@@ -2214,7 +2218,7 @@ static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packet cmd,
peer_req = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO);
if (!peer_req) {
put_ldev(mdev);
- return false;
+ return -ENOMEM;
}

switch (cmd) {
@@ -2327,7 +2331,7 @@ submit:
spin_unlock_irq(&mdev->tconn->req_lock);

if (drbd_submit_peer_request(mdev, peer_req, READ, fault_type) == 0)
- return true;
+ return 0;

/* don't care for the reason here */
dev_err(DEV, "submit failed, triggering re-connect\n");
@@ -2339,7 +2343,7 @@ submit:
out_free_e:
put_ldev(mdev);
drbd_free_ee(mdev, peer_req);
- return false;
+ return -EIO;
}

static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local)
@@ -2934,9 +2938,11 @@ static int receive_protocol(struct drbd_tconn *tconn, enum drbd_packet cmd,

if (tconn->agreed_pro_version >= 87) {
unsigned char *my_alg = tconn->net_conf->integrity_alg;
+ int err;

- if (drbd_recv(tconn, p_integrity_alg, data_size) != data_size)
- return false;
+ err = drbd_recv_all(tconn, p_integrity_alg, data_size);
+ if (err)
+ return err;

p_integrity_alg[SHARED_SECRET_MAX-1] = 0;
if (strcmp(p_integrity_alg, my_alg)) {
@@ -2947,11 +2953,11 @@ static int receive_protocol(struct drbd_tconn *tconn, enum drbd_packet cmd,
my_alg[0] ? my_alg : (unsigned char *)"<not-used>");
}

- return true;
+ return 0;

disconnect:
conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD);
- return false;
+ return -EIO;
}

/* helper function
@@ -2984,7 +2990,6 @@ struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev,
static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packet cmd,
unsigned int packet_size)
{
- int ok = true;
struct p_rs_param_95 *p = &mdev->tconn->data.rbuf.rs_param_95;
unsigned int header_size, data_size, exp_max_sz;
struct crypto_hash *verify_tfm = NULL;
@@ -2992,6 +2997,7 @@ static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packet cmd,
const int apv = mdev->tconn->agreed_pro_version;
int *rs_plan_s = NULL;
int fifo_size = 0;
+ int err;

exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param)
: apv == 88 ? sizeof(struct p_rs_param)
@@ -3002,7 +3008,7 @@ static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packet cmd,
if (packet_size > exp_max_sz) {
dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n",
packet_size, exp_max_sz);
- return false;
+ return -EIO;
}

if (apv <= 88) {
@@ -3021,8 +3027,9 @@ static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packet cmd,
/* initialize verify_alg and csums_alg */
memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);

- if (drbd_recv(mdev->tconn, &p->head.payload, header_size) != header_size)
- return false;
+ err = drbd_recv_all(mdev->tconn, &p->head.payload, header_size);
+ if (err)
+ return err;

mdev->ldev->dc.resync_rate = be32_to_cpu(p->rate);

@@ -3032,11 +3039,12 @@ static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packet cmd,
dev_err(DEV, "verify-alg too long, "
"peer wants %u, accepting only %u byte\n",
data_size, SHARED_SECRET_MAX);
- return false;
+ return -EIO;
}

- if (drbd_recv(mdev->tconn, p->verify_alg, data_size) != data_size)
- return false;
+ err = drbd_recv_all(mdev->tconn, p->verify_alg, data_size);
+ if (err)
+ return err;

/* we expect NUL terminated string */
/* but just in case someone tries to be evil */
@@ -3121,8 +3129,8 @@ static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packet cmd,
}
spin_unlock(&mdev->peer_seq_lock);
}
+ return 0;

- return ok;
disconnect:
/* just for completeness: actually not needed,
* as this is not reached if csums_tfm was ok. */
@@ -3130,7 +3138,7 @@ disconnect:
/* but free the verify_tfm again, if csums_tfm did not work out */
crypto_free_hash(verify_tfm);
conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD);
- return false;
+ return -EIO;
}

/* warn if the arguments differ by more than 12.5% */
@@ -3192,7 +3200,7 @@ static int receive_sizes(struct drbd_conf *mdev, enum drbd_packet cmd,
conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD);
mdev->ldev->dc.disk_size = my_usize;
put_ldev(mdev);
- return false;
+ return -EIO;
}
put_ldev(mdev);
}
@@ -3202,7 +3210,7 @@ static int receive_sizes(struct drbd_conf *mdev, enum drbd_packet cmd,
dd = drbd_determine_dev_size(mdev, ddsf);
put_ldev(mdev);
if (dd == dev_size_error)
- return false;
+ return -EIO;
drbd_md_sync(mdev);
} else {
/* I am diskless, need to accept the peer's size. */
@@ -3241,7 +3249,7 @@ static int receive_sizes(struct drbd_conf *mdev, enum drbd_packet cmd,
}
}

- return true;
+ return 0;
}

static int receive_uuids(struct drbd_conf *mdev, enum drbd_packet cmd,
@@ -3266,7 +3274,7 @@ static int receive_uuids(struct drbd_conf *mdev, enum drbd_packet cmd,
dev_err(DEV, "Can only connect to data with current UUID=%016llX\n",
(unsigned long long)mdev->ed_uuid);
conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD);
- return false;
+ return -EIO;
}

if (get_ldev(mdev)) {
@@ -3307,7 +3315,7 @@ static int receive_uuids(struct drbd_conf *mdev, enum drbd_packet cmd,
if (updated_uuids)
drbd_print_uuids(mdev, "receiver updated UUIDs to");

- return true;
+ return 0;
}

/**
@@ -3353,7 +3361,7 @@ static int receive_req_state(struct drbd_conf *mdev, enum drbd_packet cmd,
if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) &&
mutex_is_locked(mdev->state_mutex)) {
drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG);
- return true;
+ return 0;
}

mask = convert_state(mask);
@@ -3364,7 +3372,7 @@ static int receive_req_state(struct drbd_conf *mdev, enum drbd_packet cmd,

drbd_md_sync(mdev);

- return true;
+ return 0;
}

static int receive_req_conn_state(struct drbd_tconn *tconn, enum drbd_packet cmd,
@@ -3380,7 +3388,7 @@ static int receive_req_conn_state(struct drbd_tconn *tconn, enum drbd_packet cmd
if (test_bit(DISCARD_CONCURRENT, &tconn->flags) &&
mutex_is_locked(&tconn->cstate_mutex)) {
conn_send_sr_reply(tconn, SS_CONCURRENT_ST_CHG);
- return true;
+ return 0;
}

mask = convert_state(mask);
@@ -3389,7 +3397,7 @@ static int receive_req_conn_state(struct drbd_tconn *tconn, enum drbd_packet cmd
rv = conn_request_state(tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY);
conn_send_sr_reply(tconn, rv);

- return true;
+ return 0;
}

static int receive_state(struct drbd_conf *mdev, enum drbd_packet cmd,
@@ -3435,7 +3443,7 @@ static int receive_state(struct drbd_conf *mdev, enum drbd_packet cmd,
peer_state.conn == C_CONNECTED) {
if (drbd_bm_total_weight(mdev) <= mdev->rs_failed)
drbd_resync_finished(mdev);
- return true;
+ return 0;
}
}

@@ -3488,10 +3496,10 @@ static int receive_state(struct drbd_conf *mdev, enum drbd_packet cmd,
real_peer_disk = D_DISKLESS;
} else {
if (test_and_clear_bit(CONN_DRY_RUN, &mdev->tconn->flags))
- return false;
+ return -EIO;
D_ASSERT(os.conn == C_WF_REPORT_PARAMS);
conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD);
- return false;
+ return -EIO;
}
}
}
@@ -3516,7 +3524,7 @@ static int receive_state(struct drbd_conf *mdev, enum drbd_packet cmd,
drbd_uuid_new_current(mdev);
clear_bit(NEW_CUR_UUID, &mdev->flags);
conn_request_state(mdev->tconn, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD);
- return false;
+ return -EIO;
}
rv = _drbd_set_state(mdev, ns, cs_flags, NULL);
ns = mdev->state;
@@ -3524,7 +3532,7 @@ static int receive_state(struct drbd_conf *mdev, enum drbd_packet cmd,

if (rv < SS_SUCCESS) {
conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD);
- return false;
+ return -EIO;
}

if (os.conn > C_WF_REPORT_PARAMS) {
@@ -3542,7 +3550,7 @@ static int receive_state(struct drbd_conf *mdev, enum drbd_packet cmd,

drbd_md_sync(mdev); /* update connected indicator, la_size, ... */

- return true;
+ return 0;
}

static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packet cmd,
@@ -3571,7 +3579,7 @@ static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packet cmd,
} else
dev_err(DEV, "Ignoring SyncUUID packet!\n");

- return true;
+ return 0;
}

/**
@@ -3594,12 +3602,9 @@ receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size,
}
if (want == 0)
return 0;
- err = drbd_recv(mdev->tconn, buffer, want);
- if (err != want) {
- if (err >= 0)
- err = -EIO;
+ err = drbd_recv_all(mdev->tconn, buffer, want);
+ if (err)
return err;
- }

drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer);

@@ -3748,7 +3753,6 @@ static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packet cmd,
struct bm_xfer_ctx c;
void *buffer;
int err;
- int ok = false;
struct p_header *h = &mdev->tconn->data.rbuf.header;
struct packet_info pi;

@@ -3761,6 +3765,7 @@ static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packet cmd,
buffer = (unsigned long *) __get_free_page(GFP_NOIO);
if (!buffer) {
dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
+ err = -ENOMEM;
goto out;
}

@@ -3779,20 +3784,24 @@ static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packet cmd,

if (data_size > BM_PACKET_PAYLOAD_BYTES) {
dev_err(DEV, "ReportCBitmap packet too large\n");
+ err = -EIO;
goto out;
}
/* use the page buff */
p = buffer;
memcpy(p, h, sizeof(*h));
- if (drbd_recv(mdev->tconn, p->head.payload, data_size) != data_size)
- goto out;
+ err = drbd_recv_all(mdev->tconn, p->head.payload, data_size);
+ if (err)
+ goto out;
if (data_size <= (sizeof(*p) - sizeof(p->head))) {
dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size);
+ err = -EIO;
goto out;
}
err = decode_bitmap_c(mdev, p, &c, data_size);
} else {
dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd);
+ err = -EIO;
goto out;
}

@@ -3804,7 +3813,8 @@ static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packet cmd,
goto out;
break;
}
- if (drbd_recv_header(mdev->tconn, &pi))
+ err = drbd_recv_header(mdev->tconn, &pi);
+ if (err)
goto out;
cmd = pi.cmd;
data_size = pi.size;
@@ -3815,8 +3825,8 @@ static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packet cmd,
if (mdev->state.conn == C_WF_BITMAP_T) {
enum drbd_state_rv rv;

- ok = !drbd_send_bitmap(mdev);
- if (!ok)
+ err = drbd_send_bitmap(mdev);
+ if (err)
goto out;
/* Omit CS_ORDERED with this state transition to avoid deadlocks. */
rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
@@ -3827,14 +3837,14 @@ static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packet cmd,
dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n",
drbd_conn_str(mdev->state.conn));
}
+ err = 0;

- ok = true;
out:
drbd_bm_unlock(mdev);
- if (ok && mdev->state.conn == C_WF_BITMAP_S)
+ if (!err && mdev->state.conn == C_WF_BITMAP_S)
drbd_start_resync(mdev, C_SYNC_SOURCE);
free_page((unsigned long) buffer);
- return ok;
+ return err;
}

static int _tconn_receive_skip(struct drbd_tconn *tconn, unsigned int data_size)
@@ -3851,7 +3861,7 @@ static int _tconn_receive_skip(struct drbd_tconn *tconn, unsigned int data_size)
break;
size -= r;
}
- return size == 0;
+ return size ? -EIO : 0;
}

static int receive_skip(struct drbd_conf *mdev, enum drbd_packet cmd,
@@ -3878,7 +3888,7 @@ static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packet cmd,
* with the data requests being unplugged */
drbd_tcp_quickack(mdev->tconn->data.socket);

- return true;
+ return 0;
}

static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packet cmd,
@@ -3898,7 +3908,7 @@ static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packet cmd,

drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize));

- return true;
+ return 0;
}

struct data_cmd {
@@ -3951,7 +3961,7 @@ static void drbdd(struct drbd_tconn *tconn)
struct p_header *header = &tconn->data.rbuf.header;
struct packet_info pi;
size_t shs; /* sub header size */
- int rv;
+ int err;

while (get_t_state(&tconn->receiver) == RUNNING) {
drbd_thread_current_set_cpu(&tconn->receiver);
@@ -3971,34 +3981,33 @@ static void drbdd(struct drbd_tconn *tconn)
}

if (shs) {
- rv = drbd_recv(tconn, &header->payload, shs);
- if (unlikely(rv != shs)) {
+ err = drbd_recv_all(tconn, &header->payload, shs);
+ if (err) {
if (!signal_pending(current))
- conn_warn(tconn, "short read while reading sub header: rv=%d\n", rv);
+ conn_warn(tconn, "short read while reading sub header: rv=%d\n", err);
goto err_out;
}
}

if (drbd_cmd_handler[pi.cmd].fa_type == CONN) {
- rv = drbd_cmd_handler[pi.cmd].conn_fn(tconn, pi.cmd, pi.size - shs);
+ err = drbd_cmd_handler[pi.cmd].conn_fn(tconn, pi.cmd, pi.size - shs);
} else {
struct drbd_conf *mdev = vnr_to_mdev(tconn, pi.vnr);
- rv = mdev ?
+ err = mdev ?
drbd_cmd_handler[pi.cmd].mdev_fn(mdev, pi.cmd, pi.size - shs) :
tconn_receive_skip(tconn, pi.cmd, pi.size - shs);
}

- if (unlikely(!rv)) {
+ if (unlikely(err)) {
conn_err(tconn, "error receiving %s, l: %d!\n",
cmdname(pi.cmd), pi.size);
goto err_out;
}
}
+ return;

- if (0) {
- err_out:
- conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD);
- }
+ err_out:
+ conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD);
}

void conn_flush_workqueue(struct drbd_tconn *tconn)
--
1.7.4.1


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