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-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_recvfrom.c586
1 files changed, 586 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
new file mode 100644
index 00000000000..ab54a736486
--- /dev/null
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -0,0 +1,586 @@
+/*
+ * Copyright (c) 2005-2006 Network Appliance, 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 BSD-type
+ * 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.
+ *
+ * Neither the name of the Network Appliance, Inc. nor the names of
+ * its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Author: Tom Tucker <tom@opengridcomputing.com>
+ */
+
+#include <linux/sunrpc/debug.h>
+#include <linux/sunrpc/rpc_rdma.h>
+#include <linux/spinlock.h>
+#include <asm/unaligned.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <linux/sunrpc/svc_rdma.h>
+
+#define RPCDBG_FACILITY RPCDBG_SVCXPRT
+
+/*
+ * Replace the pages in the rq_argpages array with the pages from the SGE in
+ * the RDMA_RECV completion. The SGL should contain full pages up until the
+ * last one.
+ */
+static void rdma_build_arg_xdr(struct svc_rqst *rqstp,
+ struct svc_rdma_op_ctxt *ctxt,
+ u32 byte_count)
+{
+ struct page *page;
+ u32 bc;
+ int sge_no;
+
+ /* Swap the page in the SGE with the page in argpages */
+ page = ctxt->pages[0];
+ put_page(rqstp->rq_pages[0]);
+ rqstp->rq_pages[0] = page;
+
+ /* Set up the XDR head */
+ rqstp->rq_arg.head[0].iov_base = page_address(page);
+ rqstp->rq_arg.head[0].iov_len = min(byte_count, ctxt->sge[0].length);
+ rqstp->rq_arg.len = byte_count;
+ rqstp->rq_arg.buflen = byte_count;
+
+ /* Compute bytes past head in the SGL */
+ bc = byte_count - rqstp->rq_arg.head[0].iov_len;
+
+ /* If data remains, store it in the pagelist */
+ rqstp->rq_arg.page_len = bc;
+ rqstp->rq_arg.page_base = 0;
+ rqstp->rq_arg.pages = &rqstp->rq_pages[1];
+ sge_no = 1;
+ while (bc && sge_no < ctxt->count) {
+ page = ctxt->pages[sge_no];
+ put_page(rqstp->rq_pages[sge_no]);
+ rqstp->rq_pages[sge_no] = page;
+ bc -= min(bc, ctxt->sge[sge_no].length);
+ rqstp->rq_arg.buflen += ctxt->sge[sge_no].length;
+ sge_no++;
+ }
+ rqstp->rq_respages = &rqstp->rq_pages[sge_no];
+
+ /* We should never run out of SGE because the limit is defined to
+ * support the max allowed RPC data length
+ */
+ BUG_ON(bc && (sge_no == ctxt->count));
+ BUG_ON((rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len)
+ != byte_count);
+ BUG_ON(rqstp->rq_arg.len != byte_count);
+
+ /* If not all pages were used from the SGL, free the remaining ones */
+ bc = sge_no;
+ while (sge_no < ctxt->count) {
+ page = ctxt->pages[sge_no++];
+ put_page(page);
+ }
+ ctxt->count = bc;
+
+ /* Set up tail */
+ rqstp->rq_arg.tail[0].iov_base = NULL;
+ rqstp->rq_arg.tail[0].iov_len = 0;
+}
+
+struct chunk_sge {
+ int start; /* sge no for this chunk */
+ int count; /* sge count for this chunk */
+};
+
+/* Encode a read-chunk-list as an array of IB SGE
+ *
+ * Assumptions:
+ * - chunk[0]->position points to pages[0] at an offset of 0
+ * - pages[] is not physically or virtually contigous and consists of
+ * PAGE_SIZE elements.
+ *
+ * Output:
+ * - sge array pointing into pages[] array.
+ * - chunk_sge array specifying sge index and count for each
+ * chunk in the read list
+ *
+ */
+static int rdma_rcl_to_sge(struct svcxprt_rdma *xprt,
+ struct svc_rqst *rqstp,
+ struct svc_rdma_op_ctxt *head,
+ struct rpcrdma_msg *rmsgp,
+ struct ib_sge *sge,
+ struct chunk_sge *ch_sge_ary,
+ int ch_count,
+ int byte_count)
+{
+ int sge_no;
+ int sge_bytes;
+ int page_off;
+ int page_no;
+ int ch_bytes;
+ int ch_no;
+ struct rpcrdma_read_chunk *ch;
+
+ sge_no = 0;
+ page_no = 0;
+ page_off = 0;
+ ch = (struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
+ ch_no = 0;
+ ch_bytes = ch->rc_target.rs_length;
+ head->arg.head[0] = rqstp->rq_arg.head[0];
+ head->arg.tail[0] = rqstp->rq_arg.tail[0];
+ head->arg.pages = &head->pages[head->count];
+ head->sge[0].length = head->count; /* save count of hdr pages */
+ head->arg.page_base = 0;
+ head->arg.page_len = ch_bytes;
+ head->arg.len = rqstp->rq_arg.len + ch_bytes;
+ head->arg.buflen = rqstp->rq_arg.buflen + ch_bytes;
+ head->count++;
+ ch_sge_ary[0].start = 0;
+ while (byte_count) {
+ sge_bytes = min_t(int, PAGE_SIZE-page_off, ch_bytes);
+ sge[sge_no].addr =
+ ib_dma_map_page(xprt->sc_cm_id->device,
+ rqstp->rq_arg.pages[page_no],
+ page_off, sge_bytes,
+ DMA_FROM_DEVICE);
+ sge[sge_no].length = sge_bytes;
+ sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
+ /*
+ * Don't bump head->count here because the same page
+ * may be used by multiple SGE.
+ */
+ head->arg.pages[page_no] = rqstp->rq_arg.pages[page_no];
+ rqstp->rq_respages = &rqstp->rq_arg.pages[page_no+1];
+
+ byte_count -= sge_bytes;
+ ch_bytes -= sge_bytes;
+ sge_no++;
+ /*
+ * If all bytes for this chunk have been mapped to an
+ * SGE, move to the next SGE
+ */
+ if (ch_bytes == 0) {
+ ch_sge_ary[ch_no].count =
+ sge_no - ch_sge_ary[ch_no].start;
+ ch_no++;
+ ch++;
+ ch_sge_ary[ch_no].start = sge_no;
+ ch_bytes = ch->rc_target.rs_length;
+ /* If bytes remaining account for next chunk */
+ if (byte_count) {
+ head->arg.page_len += ch_bytes;
+ head->arg.len += ch_bytes;
+ head->arg.buflen += ch_bytes;
+ }
+ }
+ /*
+ * If this SGE consumed all of the page, move to the
+ * next page
+ */
+ if ((sge_bytes + page_off) == PAGE_SIZE) {
+ page_no++;
+ page_off = 0;
+ /*
+ * If there are still bytes left to map, bump
+ * the page count
+ */
+ if (byte_count)
+ head->count++;
+ } else
+ page_off += sge_bytes;
+ }
+ BUG_ON(byte_count != 0);
+ return sge_no;
+}
+
+static void rdma_set_ctxt_sge(struct svc_rdma_op_ctxt *ctxt,
+ struct ib_sge *sge,
+ u64 *sgl_offset,
+ int count)
+{
+ int i;
+
+ ctxt->count = count;
+ for (i = 0; i < count; i++) {
+ ctxt->sge[i].addr = sge[i].addr;
+ ctxt->sge[i].length = sge[i].length;
+ *sgl_offset = *sgl_offset + sge[i].length;
+ }
+}
+
+static int rdma_read_max_sge(struct svcxprt_rdma *xprt, int sge_count)
+{
+#ifdef RDMA_TRANSPORT_IWARP
+ if ((RDMA_TRANSPORT_IWARP ==
+ rdma_node_get_transport(xprt->sc_cm_id->
+ device->node_type))
+ && sge_count > 1)
+ return 1;
+ else
+#endif
+ return min_t(int, sge_count, xprt->sc_max_sge);
+}
+
+/*
+ * Use RDMA_READ to read data from the advertised client buffer into the
+ * XDR stream starting at rq_arg.head[0].iov_base.
+ * Each chunk in the array
+ * contains the following fields:
+ * discrim - '1', This isn't used for data placement
+ * position - The xdr stream offset (the same for every chunk)
+ * handle - RMR for client memory region
+ * length - data transfer length
+ * offset - 64 bit tagged offset in remote memory region
+ *
+ * On our side, we need to read into a pagelist. The first page immediately
+ * follows the RPC header.
+ *
+ * This function returns 1 to indicate success. The data is not yet in
+ * the pagelist and therefore the RPC request must be deferred. The
+ * I/O completion will enqueue the transport again and
+ * svc_rdma_recvfrom will complete the request.
+ *
+ * NOTE: The ctxt must not be touched after the last WR has been posted
+ * because the I/O completion processing may occur on another
+ * processor and free / modify the context. Ne touche pas!
+ */
+static int rdma_read_xdr(struct svcxprt_rdma *xprt,
+ struct rpcrdma_msg *rmsgp,
+ struct svc_rqst *rqstp,
+ struct svc_rdma_op_ctxt *hdr_ctxt)
+{
+ struct ib_send_wr read_wr;
+ int err = 0;
+ int ch_no;
+ struct ib_sge *sge;
+ int ch_count;
+ int byte_count;
+ int sge_count;
+ u64 sgl_offset;
+ struct rpcrdma_read_chunk *ch;
+ struct svc_rdma_op_ctxt *ctxt = NULL;
+ struct svc_rdma_op_ctxt *head;
+ struct svc_rdma_op_ctxt *tmp_sge_ctxt;
+ struct svc_rdma_op_ctxt *tmp_ch_ctxt;
+ struct chunk_sge *ch_sge_ary;
+
+ /* If no read list is present, return 0 */
+ ch = svc_rdma_get_read_chunk(rmsgp);
+ if (!ch)
+ return 0;
+
+ /* Allocate temporary contexts to keep SGE */
+ BUG_ON(sizeof(struct ib_sge) < sizeof(struct chunk_sge));
+ tmp_sge_ctxt = svc_rdma_get_context(xprt);
+ sge = tmp_sge_ctxt->sge;
+ tmp_ch_ctxt = svc_rdma_get_context(xprt);
+ ch_sge_ary = (struct chunk_sge *)tmp_ch_ctxt->sge;
+
+ svc_rdma_rcl_chunk_counts(ch, &ch_count, &byte_count);
+ sge_count = rdma_rcl_to_sge(xprt, rqstp, hdr_ctxt, rmsgp,
+ sge, ch_sge_ary,
+ ch_count, byte_count);
+ head = svc_rdma_get_context(xprt);
+ sgl_offset = 0;
+ ch_no = 0;
+
+ for (ch = (struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
+ ch->rc_discrim != 0; ch++, ch_no++) {
+next_sge:
+ if (!ctxt)
+ ctxt = head;
+ else {
+ ctxt->next = svc_rdma_get_context(xprt);
+ ctxt = ctxt->next;
+ }
+ ctxt->next = NULL;
+ ctxt->direction = DMA_FROM_DEVICE;
+ clear_bit(RDMACTXT_F_READ_DONE, &ctxt->flags);
+ clear_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
+ if ((ch+1)->rc_discrim == 0) {
+ /*
+ * Checked in sq_cq_reap to see if we need to
+ * be enqueued
+ */
+ set_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
+ ctxt->next = hdr_ctxt;
+ hdr_ctxt->next = head;
+ }
+
+ /* Prepare READ WR */
+ memset(&read_wr, 0, sizeof read_wr);
+ ctxt->wr_op = IB_WR_RDMA_READ;
+ read_wr.wr_id = (unsigned long)ctxt;
+ read_wr.opcode = IB_WR_RDMA_READ;
+ read_wr.send_flags = IB_SEND_SIGNALED;
+ read_wr.wr.rdma.rkey = ch->rc_target.rs_handle;
+ read_wr.wr.rdma.remote_addr =
+ get_unaligned(&(ch->rc_target.rs_offset)) +
+ sgl_offset;
+ read_wr.sg_list = &sge[ch_sge_ary[ch_no].start];
+ read_wr.num_sge =
+ rdma_read_max_sge(xprt, ch_sge_ary[ch_no].count);
+ rdma_set_ctxt_sge(ctxt, &sge[ch_sge_ary[ch_no].start],
+ &sgl_offset,
+ read_wr.num_sge);
+
+ /* Post the read */
+ err = svc_rdma_send(xprt, &read_wr);
+ if (err) {
+ printk(KERN_ERR "svcrdma: Error posting send = %d\n",
+ err);
+ /*
+ * Break the circular list so free knows when
+ * to stop if the error happened to occur on
+ * the last read
+ */
+ ctxt->next = NULL;
+ goto out;
+ }
+ atomic_inc(&rdma_stat_read);
+
+ if (read_wr.num_sge < ch_sge_ary[ch_no].count) {
+ ch_sge_ary[ch_no].count -= read_wr.num_sge;
+ ch_sge_ary[ch_no].start += read_wr.num_sge;
+ goto next_sge;
+ }
+ sgl_offset = 0;
+ err = 0;
+ }
+
+ out:
+ svc_rdma_put_context(tmp_sge_ctxt, 0);
+ svc_rdma_put_context(tmp_ch_ctxt, 0);
+
+ /* Detach arg pages. svc_recv will replenish them */
+ for (ch_no = 0; &rqstp->rq_pages[ch_no] < rqstp->rq_respages; ch_no++)
+ rqstp->rq_pages[ch_no] = NULL;
+
+ /*
+ * Detach res pages. svc_release must see a resused count of
+ * zero or it will attempt to put them.
+ */
+ while (rqstp->rq_resused)
+ rqstp->rq_respages[--rqstp->rq_resused] = NULL;
+
+ if (err) {
+ printk(KERN_ERR "svcrdma : RDMA_READ error = %d\n", err);
+ set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+ /* Free the linked list of read contexts */
+ while (head != NULL) {
+ ctxt = head->next;
+ svc_rdma_put_context(head, 1);
+ head = ctxt;
+ }
+ return 0;
+ }
+
+ return 1;
+}
+
+static int rdma_read_complete(struct svc_rqst *rqstp,
+ struct svc_rdma_op_ctxt *data)
+{
+ struct svc_rdma_op_ctxt *head = data->next;
+ int page_no;
+ int ret;
+
+ BUG_ON(!head);
+
+ /* Copy RPC pages */
+ for (page_no = 0; page_no < head->count; page_no++) {
+ put_page(rqstp->rq_pages[page_no]);
+ rqstp->rq_pages[page_no] = head->pages[page_no];
+ }
+ /* Point rq_arg.pages past header */
+ rqstp->rq_arg.pages = &rqstp->rq_pages[head->sge[0].length];
+ rqstp->rq_arg.page_len = head->arg.page_len;
+ rqstp->rq_arg.page_base = head->arg.page_base;
+
+ /* rq_respages starts after the last arg page */
+ rqstp->rq_respages = &rqstp->rq_arg.pages[page_no];
+ rqstp->rq_resused = 0;
+
+ /* Rebuild rq_arg head and tail. */
+ rqstp->rq_arg.head[0] = head->arg.head[0];
+ rqstp->rq_arg.tail[0] = head->arg.tail[0];
+ rqstp->rq_arg.len = head->arg.len;
+ rqstp->rq_arg.buflen = head->arg.buflen;
+
+ /* XXX: What should this be? */
+ rqstp->rq_prot = IPPROTO_MAX;
+
+ /*
+ * Free the contexts we used to build the RDMA_READ. We have
+ * to be careful here because the context list uses the same
+ * next pointer used to chain the contexts associated with the
+ * RDMA_READ
+ */
+ data->next = NULL; /* terminate circular list */
+ do {
+ data = head->next;
+ svc_rdma_put_context(head, 0);
+ head = data;
+ } while (head != NULL);
+
+ ret = rqstp->rq_arg.head[0].iov_len
+ + rqstp->rq_arg.page_len
+ + rqstp->rq_arg.tail[0].iov_len;
+ dprintk("svcrdma: deferred read ret=%d, rq_arg.len =%d, "
+ "rq_arg.head[0].iov_base=%p, rq_arg.head[0].iov_len = %zd\n",
+ ret, rqstp->rq_arg.len, rqstp->rq_arg.head[0].iov_base,
+ rqstp->rq_arg.head[0].iov_len);
+
+ /* Indicate that we've consumed an RQ credit */
+ rqstp->rq_xprt_ctxt = rqstp->rq_xprt;
+ svc_xprt_received(rqstp->rq_xprt);
+ return ret;
+}
+
+/*
+ * Set up the rqstp thread context to point to the RQ buffer. If
+ * necessary, pull additional data from the client with an RDMA_READ
+ * request.
+ */
+int svc_rdma_recvfrom(struct svc_rqst *rqstp)
+{
+ struct svc_xprt *xprt = rqstp->rq_xprt;
+ struct svcxprt_rdma *rdma_xprt =
+ container_of(xprt, struct svcxprt_rdma, sc_xprt);
+ struct svc_rdma_op_ctxt *ctxt = NULL;
+ struct rpcrdma_msg *rmsgp;
+ int ret = 0;
+ int len;
+
+ dprintk("svcrdma: rqstp=%p\n", rqstp);
+
+ /*
+ * The rq_xprt_ctxt indicates if we've consumed an RQ credit
+ * or not. It is used in the rdma xpo_release_rqst function to
+ * determine whether or not to return an RQ WQE to the RQ.
+ */
+ rqstp->rq_xprt_ctxt = NULL;
+
+ spin_lock_bh(&rdma_xprt->sc_read_complete_lock);
+ if (!list_empty(&rdma_xprt->sc_read_complete_q)) {
+ ctxt = list_entry(rdma_xprt->sc_read_complete_q.next,
+ struct svc_rdma_op_ctxt,
+ dto_q);
+ list_del_init(&ctxt->dto_q);
+ }
+ spin_unlock_bh(&rdma_xprt->sc_read_complete_lock);
+ if (ctxt)
+ return rdma_read_complete(rqstp, ctxt);
+
+ spin_lock_bh(&rdma_xprt->sc_rq_dto_lock);
+ if (!list_empty(&rdma_xprt->sc_rq_dto_q)) {
+ ctxt = list_entry(rdma_xprt->sc_rq_dto_q.next,
+ struct svc_rdma_op_ctxt,
+ dto_q);
+ list_del_init(&ctxt->dto_q);
+ } else {
+ atomic_inc(&rdma_stat_rq_starve);
+ clear_bit(XPT_DATA, &xprt->xpt_flags);
+ ctxt = NULL;
+ }
+ spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
+ if (!ctxt) {
+ /* This is the EAGAIN path. The svc_recv routine will
+ * return -EAGAIN, the nfsd thread will go to call into
+ * svc_recv again and we shouldn't be on the active
+ * transport list
+ */
+ if (test_bit(XPT_CLOSE, &xprt->xpt_flags))
+ goto close_out;
+
+ BUG_ON(ret);
+ goto out;
+ }
+ dprintk("svcrdma: processing ctxt=%p on xprt=%p, rqstp=%p, status=%d\n",
+ ctxt, rdma_xprt, rqstp, ctxt->wc_status);
+ BUG_ON(ctxt->wc_status != IB_WC_SUCCESS);
+ atomic_inc(&rdma_stat_recv);
+
+ /* Build up the XDR from the receive buffers. */
+ rdma_build_arg_xdr(rqstp, ctxt, ctxt->byte_len);
+
+ /* Decode the RDMA header. */
+ len = svc_rdma_xdr_decode_req(&rmsgp, rqstp);
+ rqstp->rq_xprt_hlen = len;
+
+ /* If the request is invalid, reply with an error */
+ if (len < 0) {
+ if (len == -ENOSYS)
+ (void)svc_rdma_send_error(rdma_xprt, rmsgp, ERR_VERS);
+ goto close_out;
+ }
+
+ /* Read read-list data. If we would need to wait, defer
+ * it. Not that in this case, we don't return the RQ credit
+ * until after the read completes.
+ */
+ if (rdma_read_xdr(rdma_xprt, rmsgp, rqstp, ctxt)) {
+ svc_xprt_received(xprt);
+ return 0;
+ }
+
+ /* Indicate we've consumed an RQ credit */
+ rqstp->rq_xprt_ctxt = rqstp->rq_xprt;
+
+ ret = rqstp->rq_arg.head[0].iov_len
+ + rqstp->rq_arg.page_len
+ + rqstp->rq_arg.tail[0].iov_len;
+ svc_rdma_put_context(ctxt, 0);
+ out:
+ dprintk("svcrdma: ret = %d, rq_arg.len =%d, "
+ "rq_arg.head[0].iov_base=%p, rq_arg.head[0].iov_len = %zd\n",
+ ret, rqstp->rq_arg.len,
+ rqstp->rq_arg.head[0].iov_base,
+ rqstp->rq_arg.head[0].iov_len);
+ rqstp->rq_prot = IPPROTO_MAX;
+ svc_xprt_copy_addrs(rqstp, xprt);
+ svc_xprt_received(xprt);
+ return ret;
+
+ close_out:
+ if (ctxt) {
+ svc_rdma_put_context(ctxt, 1);
+ /* Indicate we've consumed an RQ credit */
+ rqstp->rq_xprt_ctxt = rqstp->rq_xprt;
+ }
+ dprintk("svcrdma: transport %p is closing\n", xprt);
+ /*
+ * Set the close bit and enqueue it. svc_recv will see the
+ * close bit and call svc_xprt_delete
+ */
+ set_bit(XPT_CLOSE, &xprt->xpt_flags);
+ svc_xprt_received(xprt);
+ return 0;
+}
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