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ipath_ruc.c

/*
 * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/spinlock.h>

#include "ipath_verbs.h"
#include "ipath_kernel.h"

/*
 * Convert the AETH RNR timeout code into the number of milliseconds.
 */
const u32 ib_ipath_rnr_table[32] = {
      656,              /* 0 */
      1,                /* 1 */
      1,                /* 2 */
      1,                /* 3 */
      1,                /* 4 */
      1,                /* 5 */
      1,                /* 6 */
      1,                /* 7 */
      1,                /* 8 */
      1,                /* 9 */
      1,                /* A */
      1,                /* B */
      1,                /* C */
      1,                /* D */
      2,                /* E */
      2,                /* F */
      3,                /* 10 */
      4,                /* 11 */
      6,                /* 12 */
      8,                /* 13 */
      11,               /* 14 */
      16,               /* 15 */
      21,               /* 16 */
      31,               /* 17 */
      41,               /* 18 */
      62,               /* 19 */
      82,               /* 1A */
      123,              /* 1B */
      164,              /* 1C */
      246,              /* 1D */
      328,              /* 1E */
      492               /* 1F */
};

/**
 * ipath_insert_rnr_queue - put QP on the RNR timeout list for the device
 * @qp: the QP
 *
 * XXX Use a simple list for now.  We might need a priority
 * queue if we have lots of QPs waiting for RNR timeouts
 * but that should be rare.
 */
void ipath_insert_rnr_queue(struct ipath_qp *qp)
{
      struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
      unsigned long flags;

      spin_lock_irqsave(&dev->pending_lock, flags);
      if (list_empty(&dev->rnrwait))
            list_add(&qp->timerwait, &dev->rnrwait);
      else {
            struct list_head *l = &dev->rnrwait;
            struct ipath_qp *nqp = list_entry(l->next, struct ipath_qp,
                                      timerwait);

            while (qp->s_rnr_timeout >= nqp->s_rnr_timeout) {
                  qp->s_rnr_timeout -= nqp->s_rnr_timeout;
                  l = l->next;
                  if (l->next == &dev->rnrwait)
                        break;
                  nqp = list_entry(l->next, struct ipath_qp,
                               timerwait);
            }
            list_add(&qp->timerwait, l);
      }
      spin_unlock_irqrestore(&dev->pending_lock, flags);
}

/**
 * ipath_init_sge - Validate a RWQE and fill in the SGE state
 * @qp: the QP
 *
 * Return 1 if OK.
 */
int ipath_init_sge(struct ipath_qp *qp, struct ipath_rwqe *wqe,
               u32 *lengthp, struct ipath_sge_state *ss)
{
      int i, j, ret;
      struct ib_wc wc;

      *lengthp = 0;
      for (i = j = 0; i < wqe->num_sge; i++) {
            if (wqe->sg_list[i].length == 0)
                  continue;
            /* Check LKEY */
            if (!ipath_lkey_ok(qp, j ? &ss->sg_list[j - 1] : &ss->sge,
                           &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE))
                  goto bad_lkey;
            *lengthp += wqe->sg_list[i].length;
            j++;
      }
      ss->num_sge = j;
      ret = 1;
      goto bail;

bad_lkey:
      wc.wr_id = wqe->wr_id;
      wc.status = IB_WC_LOC_PROT_ERR;
      wc.opcode = IB_WC_RECV;
      wc.vendor_err = 0;
      wc.byte_len = 0;
      wc.imm_data = 0;
      wc.qp = &qp->ibqp;
      wc.src_qp = 0;
      wc.wc_flags = 0;
      wc.pkey_index = 0;
      wc.slid = 0;
      wc.sl = 0;
      wc.dlid_path_bits = 0;
      wc.port_num = 0;
      /* Signal solicited completion event. */
      ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
      ret = 0;
bail:
      return ret;
}

/**
 * ipath_get_rwqe - copy the next RWQE into the QP's RWQE
 * @qp: the QP
 * @wr_id_only: update wr_id only, not SGEs
 *
 * Return 0 if no RWQE is available, otherwise return 1.
 *
 * Can be called from interrupt level.
 */
int ipath_get_rwqe(struct ipath_qp *qp, int wr_id_only)
{
      unsigned long flags;
      struct ipath_rq *rq;
      struct ipath_rwq *wq;
      struct ipath_srq *srq;
      struct ipath_rwqe *wqe;
      void (*handler)(struct ib_event *, void *);
      u32 tail;
      int ret;

      qp->r_sge.sg_list = qp->r_sg_list;

      if (qp->ibqp.srq) {
            srq = to_isrq(qp->ibqp.srq);
            handler = srq->ibsrq.event_handler;
            rq = &srq->rq;
      } else {
            srq = NULL;
            handler = NULL;
            rq = &qp->r_rq;
      }

      spin_lock_irqsave(&rq->lock, flags);
      wq = rq->wq;
      tail = wq->tail;
      /* Validate tail before using it since it is user writable. */
      if (tail >= rq->size)
            tail = 0;
      do {
            if (unlikely(tail == wq->head)) {
                  spin_unlock_irqrestore(&rq->lock, flags);
                  ret = 0;
                  goto bail;
            }
            /* Make sure entry is read after head index is read. */
            smp_rmb();
            wqe = get_rwqe_ptr(rq, tail);
            if (++tail >= rq->size)
                  tail = 0;
      } while (!wr_id_only && !ipath_init_sge(qp, wqe, &qp->r_len,
                                    &qp->r_sge));
      qp->r_wr_id = wqe->wr_id;
      wq->tail = tail;

      ret = 1;
      qp->r_wrid_valid = 1;
      if (handler) {
            u32 n;

            /*
             * validate head pointer value and compute
             * the number of remaining WQEs.
             */
            n = wq->head;
            if (n >= rq->size)
                  n = 0;
            if (n < tail)
                  n += rq->size - tail;
            else
                  n -= tail;
            if (n < srq->limit) {
                  struct ib_event ev;

                  srq->limit = 0;
                  spin_unlock_irqrestore(&rq->lock, flags);
                  ev.device = qp->ibqp.device;
                  ev.element.srq = qp->ibqp.srq;
                  ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
                  handler(&ev, srq->ibsrq.srq_context);
                  goto bail;
            }
      }
      spin_unlock_irqrestore(&rq->lock, flags);

bail:
      return ret;
}

/**
 * ipath_ruc_loopback - handle UC and RC lookback requests
 * @sqp: the sending QP
 *
 * This is called from ipath_do_send() to
 * forward a WQE addressed to the same HCA.
 * Note that although we are single threaded due to the tasklet, we still
 * have to protect against post_send().  We don't have to worry about
 * receive interrupts since this is a connected protocol and all packets
 * will pass through here.
 */
static void ipath_ruc_loopback(struct ipath_qp *sqp)
{
      struct ipath_ibdev *dev = to_idev(sqp->ibqp.device);
      struct ipath_qp *qp;
      struct ipath_swqe *wqe;
      struct ipath_sge *sge;
      unsigned long flags;
      struct ib_wc wc;
      u64 sdata;
      atomic64_t *maddr;

      qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn);
      if (!qp) {
            dev->n_pkt_drops++;
            return;
      }

again:
      spin_lock_irqsave(&sqp->s_lock, flags);

      if (!(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_SEND_OK) ||
          sqp->s_rnr_timeout) {
            spin_unlock_irqrestore(&sqp->s_lock, flags);
            goto done;
      }

      /* Get the next send request. */
      if (sqp->s_last == sqp->s_head) {
            /* Send work queue is empty. */
            spin_unlock_irqrestore(&sqp->s_lock, flags);
            goto done;
      }

      /*
       * We can rely on the entry not changing without the s_lock
       * being held until we update s_last.
       */
      wqe = get_swqe_ptr(sqp, sqp->s_last);
      spin_unlock_irqrestore(&sqp->s_lock, flags);

      wc.wc_flags = 0;
      wc.imm_data = 0;

      sqp->s_sge.sge = wqe->sg_list[0];
      sqp->s_sge.sg_list = wqe->sg_list + 1;
      sqp->s_sge.num_sge = wqe->wr.num_sge;
      sqp->s_len = wqe->length;
      switch (wqe->wr.opcode) {
      case IB_WR_SEND_WITH_IMM:
            wc.wc_flags = IB_WC_WITH_IMM;
            wc.imm_data = wqe->wr.imm_data;
            /* FALLTHROUGH */
      case IB_WR_SEND:
            if (!ipath_get_rwqe(qp, 0)) {
            rnr_nak:
                  /* Handle RNR NAK */
                  if (qp->ibqp.qp_type == IB_QPT_UC)
                        goto send_comp;
                  if (sqp->s_rnr_retry == 0) {
                        wc.status = IB_WC_RNR_RETRY_EXC_ERR;
                        goto err;
                  }
                  if (sqp->s_rnr_retry_cnt < 7)
                        sqp->s_rnr_retry--;
                  dev->n_rnr_naks++;
                  sqp->s_rnr_timeout =
                        ib_ipath_rnr_table[qp->r_min_rnr_timer];
                  ipath_insert_rnr_queue(sqp);
                  goto done;
            }
            break;

      case IB_WR_RDMA_WRITE_WITH_IMM:
            if (unlikely(!(qp->qp_access_flags &
                         IB_ACCESS_REMOTE_WRITE))) {
                  wc.status = IB_WC_REM_INV_REQ_ERR;
                  goto err;
            }
            wc.wc_flags = IB_WC_WITH_IMM;
            wc.imm_data = wqe->wr.imm_data;
            if (!ipath_get_rwqe(qp, 1))
                  goto rnr_nak;
            /* FALLTHROUGH */
      case IB_WR_RDMA_WRITE:
            if (unlikely(!(qp->qp_access_flags &
                         IB_ACCESS_REMOTE_WRITE))) {
                  wc.status = IB_WC_REM_INV_REQ_ERR;
                  goto err;
            }
            if (wqe->length == 0)
                  break;
            if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, wqe->length,
                                  wqe->wr.wr.rdma.remote_addr,
                                  wqe->wr.wr.rdma.rkey,
                                  IB_ACCESS_REMOTE_WRITE))) {
            acc_err:
                  wc.status = IB_WC_REM_ACCESS_ERR;
            err:
                  wc.wr_id = wqe->wr.wr_id;
                  wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
                  wc.vendor_err = 0;
                  wc.byte_len = 0;
                  wc.qp = &sqp->ibqp;
                  wc.src_qp = sqp->remote_qpn;
                  wc.pkey_index = 0;
                  wc.slid = sqp->remote_ah_attr.dlid;
                  wc.sl = sqp->remote_ah_attr.sl;
                  wc.dlid_path_bits = 0;
                  wc.port_num = 0;
                  spin_lock_irqsave(&sqp->s_lock, flags);
                  ipath_sqerror_qp(sqp, &wc);
                  spin_unlock_irqrestore(&sqp->s_lock, flags);
                  goto done;
            }
            break;

      case IB_WR_RDMA_READ:
            if (unlikely(!(qp->qp_access_flags &
                         IB_ACCESS_REMOTE_READ))) {
                  wc.status = IB_WC_REM_INV_REQ_ERR;
                  goto err;
            }
            if (unlikely(!ipath_rkey_ok(qp, &sqp->s_sge, wqe->length,
                                  wqe->wr.wr.rdma.remote_addr,
                                  wqe->wr.wr.rdma.rkey,
                                  IB_ACCESS_REMOTE_READ)))
                  goto acc_err;
            qp->r_sge.sge = wqe->sg_list[0];
            qp->r_sge.sg_list = wqe->sg_list + 1;
            qp->r_sge.num_sge = wqe->wr.num_sge;
            break;

      case IB_WR_ATOMIC_CMP_AND_SWP:
      case IB_WR_ATOMIC_FETCH_AND_ADD:
            if (unlikely(!(qp->qp_access_flags &
                         IB_ACCESS_REMOTE_ATOMIC))) {
                  wc.status = IB_WC_REM_INV_REQ_ERR;
                  goto err;
            }
            if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, sizeof(u64),
                                  wqe->wr.wr.atomic.remote_addr,
                                  wqe->wr.wr.atomic.rkey,
                                  IB_ACCESS_REMOTE_ATOMIC)))
                  goto acc_err;
            /* Perform atomic OP and save result. */
            maddr = (atomic64_t *) qp->r_sge.sge.vaddr;
            sdata = wqe->wr.wr.atomic.compare_add;
            *(u64 *) sqp->s_sge.sge.vaddr =
                  (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ?
                  (u64) atomic64_add_return(sdata, maddr) - sdata :
                  (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr,
                              sdata, wqe->wr.wr.atomic.swap);
            goto send_comp;

      default:
            goto done;
      }

      sge = &sqp->s_sge.sge;
      while (sqp->s_len) {
            u32 len = sqp->s_len;

            if (len > sge->length)
                  len = sge->length;
            if (len > sge->sge_length)
                  len = sge->sge_length;
            BUG_ON(len == 0);
            ipath_copy_sge(&qp->r_sge, sge->vaddr, len);
            sge->vaddr += len;
            sge->length -= len;
            sge->sge_length -= len;
            if (sge->sge_length == 0) {
                  if (--sqp->s_sge.num_sge)
                        *sge = *sqp->s_sge.sg_list++;
            } else if (sge->length == 0 && sge->mr != NULL) {
                  if (++sge->n >= IPATH_SEGSZ) {
                        if (++sge->m >= sge->mr->mapsz)
                              break;
                        sge->n = 0;
                  }
                  sge->vaddr =
                        sge->mr->map[sge->m]->segs[sge->n].vaddr;
                  sge->length =
                        sge->mr->map[sge->m]->segs[sge->n].length;
            }
            sqp->s_len -= len;
      }

      if (wqe->wr.opcode == IB_WR_RDMA_WRITE ||
          wqe->wr.opcode == IB_WR_RDMA_READ)
            goto send_comp;

      if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM)
            wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
      else
            wc.opcode = IB_WC_RECV;
      wc.wr_id = qp->r_wr_id;
      wc.status = IB_WC_SUCCESS;
      wc.vendor_err = 0;
      wc.byte_len = wqe->length;
      wc.qp = &qp->ibqp;
      wc.src_qp = qp->remote_qpn;
      wc.pkey_index = 0;
      wc.slid = qp->remote_ah_attr.dlid;
      wc.sl = qp->remote_ah_attr.sl;
      wc.dlid_path_bits = 0;
      wc.port_num = 1;
      /* Signal completion event if the solicited bit is set. */
      ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
                   wqe->wr.send_flags & IB_SEND_SOLICITED);

send_comp:
      sqp->s_rnr_retry = sqp->s_rnr_retry_cnt;
      ipath_send_complete(sqp, wqe, IB_WC_SUCCESS);
      goto again;

done:
      if (atomic_dec_and_test(&qp->refcount))
            wake_up(&qp->wait);
}

static void want_buffer(struct ipath_devdata *dd)
{
      set_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl);
      ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
                   dd->ipath_sendctrl);
}

/**
 * ipath_no_bufs_available - tell the layer driver we need buffers
 * @qp: the QP that caused the problem
 * @dev: the device we ran out of buffers on
 *
 * Called when we run out of PIO buffers.
 */
static void ipath_no_bufs_available(struct ipath_qp *qp,
                            struct ipath_ibdev *dev)
{
      unsigned long flags;

      /*
       * Note that as soon as want_buffer() is called and
       * possibly before it returns, ipath_ib_piobufavail()
       * could be called.  If we are still in the tasklet function,
       * tasklet_hi_schedule() will not call us until the next time
       * tasklet_hi_schedule() is called.
       * We leave the busy flag set so that another post send doesn't
       * try to put the same QP on the piowait list again.
       */
      spin_lock_irqsave(&dev->pending_lock, flags);
      list_add_tail(&qp->piowait, &dev->piowait);
      spin_unlock_irqrestore(&dev->pending_lock, flags);
      want_buffer(dev->dd);
      dev->n_piowait++;
}

/**
 * ipath_make_grh - construct a GRH header
 * @dev: a pointer to the ipath device
 * @hdr: a pointer to the GRH header being constructed
 * @grh: the global route address to send to
 * @hwords: the number of 32 bit words of header being sent
 * @nwords: the number of 32 bit words of data being sent
 *
 * Return the size of the header in 32 bit words.
 */
u32 ipath_make_grh(struct ipath_ibdev *dev, struct ib_grh *hdr,
               struct ib_global_route *grh, u32 hwords, u32 nwords)
{
      hdr->version_tclass_flow =
            cpu_to_be32((6 << 28) |
                      (grh->traffic_class << 20) |
                      grh->flow_label);
      hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2);
      /* next_hdr is defined by C8-7 in ch. 8.4.1 */
      hdr->next_hdr = 0x1B;
      hdr->hop_limit = grh->hop_limit;
      /* The SGID is 32-bit aligned. */
      hdr->sgid.global.subnet_prefix = dev->gid_prefix;
      hdr->sgid.global.interface_id = dev->dd->ipath_guid;
      hdr->dgid = grh->dgid;

      /* GRH header size in 32-bit words. */
      return sizeof(struct ib_grh) / sizeof(u32);
}

void ipath_make_ruc_header(struct ipath_ibdev *dev, struct ipath_qp *qp,
                     struct ipath_other_headers *ohdr,
                     u32 bth0, u32 bth2)
{
      u16 lrh0;
      u32 nwords;
      u32 extra_bytes;

      /* Construct the header. */
      extra_bytes = -qp->s_cur_size & 3;
      nwords = (qp->s_cur_size + extra_bytes) >> 2;
      lrh0 = IPATH_LRH_BTH;
      if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) {
            qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh,
                                     &qp->remote_ah_attr.grh,
                                     qp->s_hdrwords, nwords);
            lrh0 = IPATH_LRH_GRH;
      }
      lrh0 |= qp->remote_ah_attr.sl << 4;
      qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
      qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
      qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
      qp->s_hdr.lrh[3] = cpu_to_be16(dev->dd->ipath_lid);
      bth0 |= ipath_get_pkey(dev->dd, qp->s_pkey_index);
      bth0 |= extra_bytes << 20;
      ohdr->bth[0] = cpu_to_be32(bth0 | (1 << 22));
      ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
      ohdr->bth[2] = cpu_to_be32(bth2);
}

/**
 * ipath_do_send - perform a send on a QP
 * @data: contains a pointer to the QP
 *
 * Process entries in the send work queue until credit or queue is
 * exhausted.  Only allow one CPU to send a packet per QP (tasklet).
 * Otherwise, two threads could send packets out of order.
 */
void ipath_do_send(unsigned long data)
{
      struct ipath_qp *qp = (struct ipath_qp *)data;
      struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
      int (*make_req)(struct ipath_qp *qp);

      if (test_and_set_bit(IPATH_S_BUSY, &qp->s_busy))
            goto bail;

      if ((qp->ibqp.qp_type == IB_QPT_RC ||
           qp->ibqp.qp_type == IB_QPT_UC) &&
          qp->remote_ah_attr.dlid == dev->dd->ipath_lid) {
            ipath_ruc_loopback(qp);
            goto clear;
      }

      if (qp->ibqp.qp_type == IB_QPT_RC)
             make_req = ipath_make_rc_req;
      else if (qp->ibqp.qp_type == IB_QPT_UC)
             make_req = ipath_make_uc_req;
      else
             make_req = ipath_make_ud_req;

again:
      /* Check for a constructed packet to be sent. */
      if (qp->s_hdrwords != 0) {
            /*
             * If no PIO bufs are available, return.  An interrupt will
             * call ipath_ib_piobufavail() when one is available.
             */
            if (ipath_verbs_send(qp, &qp->s_hdr, qp->s_hdrwords,
                             qp->s_cur_sge, qp->s_cur_size)) {
                  ipath_no_bufs_available(qp, dev);
                  goto bail;
            }
            dev->n_unicast_xmit++;
            /* Record that we sent the packet and s_hdr is empty. */
            qp->s_hdrwords = 0;
      }

      if (make_req(qp))
            goto again;
clear:
      clear_bit(IPATH_S_BUSY, &qp->s_busy);
bail:;
}

void ipath_send_complete(struct ipath_qp *qp, struct ipath_swqe *wqe,
                   enum ib_wc_status status)
{
      unsigned long flags;
      u32 last;

      /* See ch. 11.2.4.1 and 10.7.3.1 */
      if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) ||
          (wqe->wr.send_flags & IB_SEND_SIGNALED) ||
          status != IB_WC_SUCCESS) {
            struct ib_wc wc;

            wc.wr_id = wqe->wr.wr_id;
            wc.status = status;
            wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
            wc.vendor_err = 0;
            wc.byte_len = wqe->length;
            wc.imm_data = 0;
            wc.qp = &qp->ibqp;
            wc.src_qp = 0;
            wc.wc_flags = 0;
            wc.pkey_index = 0;
            wc.slid = 0;
            wc.sl = 0;
            wc.dlid_path_bits = 0;
            wc.port_num = 0;
            ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0);
      }

      spin_lock_irqsave(&qp->s_lock, flags);
      last = qp->s_last;
      if (++last >= qp->s_size)
            last = 0;
      qp->s_last = last;
      spin_unlock_irqrestore(&qp->s_lock, flags);
}

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