osd_client.c 55.8 KB
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#include <linux/ceph/ceph_debug.h>
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#include <linux/module.h>
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#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
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#ifdef CONFIG_BLOCK
#include <linux/bio.h>
#endif
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#include <linux/ceph/libceph.h>
#include <linux/ceph/osd_client.h>
#include <linux/ceph/messenger.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/auth.h>
#include <linux/ceph/pagelist.h>
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#define OSD_OP_FRONT_LEN	4096
#define OSD_OPREPLY_FRONT_LEN	512
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static const struct ceph_connection_operations osd_con_ops;
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static void send_queued(struct ceph_osd_client *osdc);
static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
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static void __register_request(struct ceph_osd_client *osdc,
			       struct ceph_osd_request *req);
static void __unregister_linger_request(struct ceph_osd_client *osdc,
					struct ceph_osd_request *req);
static int __send_request(struct ceph_osd_client *osdc,
			  struct ceph_osd_request *req);
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static int op_needs_trail(int op)
{
	switch (op) {
	case CEPH_OSD_OP_GETXATTR:
	case CEPH_OSD_OP_SETXATTR:
	case CEPH_OSD_OP_CMPXATTR:
	case CEPH_OSD_OP_CALL:
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	case CEPH_OSD_OP_NOTIFY:
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		return 1;
	default:
		return 0;
	}
}

static int op_has_extent(int op)
{
	return (op == CEPH_OSD_OP_READ ||
		op == CEPH_OSD_OP_WRITE);
}

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void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
			struct ceph_file_layout *layout,
			u64 snapid,
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			u64 off, u64 *plen, u64 *bno,
			struct ceph_osd_request *req,
			struct ceph_osd_req_op *op)
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{
	struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
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	u64 orig_len = *plen;
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	u64 objoff, objlen;    /* extent in object */

	reqhead->snapid = cpu_to_le64(snapid);

	/* object extent? */
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	ceph_calc_file_object_mapping(layout, off, plen, bno,
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				      &objoff, &objlen);
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	if (*plen < orig_len)
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		dout(" skipping last %llu, final file extent %llu~%llu\n",
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		     orig_len - *plen, off, *plen);
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	if (op_has_extent(op->op)) {
		op->extent.offset = objoff;
		op->extent.length = objlen;
	}
	req->r_num_pages = calc_pages_for(off, *plen);
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	req->r_page_alignment = off & ~PAGE_MASK;
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	if (op->op == CEPH_OSD_OP_WRITE)
		op->payload_len = *plen;
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	dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
	     *bno, objoff, objlen, req->r_num_pages);

}
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EXPORT_SYMBOL(ceph_calc_raw_layout);
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/*
 * Implement client access to distributed object storage cluster.
 *
 * All data objects are stored within a cluster/cloud of OSDs, or
 * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
 * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
 * remote daemons serving up and coordinating consistent and safe
 * access to storage.
 *
 * Cluster membership and the mapping of data objects onto storage devices
 * are described by the osd map.
 *
 * We keep track of pending OSD requests (read, write), resubmit
 * requests to different OSDs when the cluster topology/data layout
 * change, or retry the affected requests when the communications
 * channel with an OSD is reset.
 */

/*
 * calculate the mapping of a file extent onto an object, and fill out the
 * request accordingly.  shorten extent as necessary if it crosses an
 * object boundary.
 *
 * fill osd op in request message.
 */
static void calc_layout(struct ceph_osd_client *osdc,
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			struct ceph_vino vino,
			struct ceph_file_layout *layout,
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			u64 off, u64 *plen,
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			struct ceph_osd_request *req,
			struct ceph_osd_req_op *op)
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{
	u64 bno;

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	ceph_calc_raw_layout(osdc, layout, vino.snap, off,
			     plen, &bno, req, op);
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	snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno);
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	req->r_oid_len = strlen(req->r_oid);
}

/*
 * requests
 */
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void ceph_osdc_release_request(struct kref *kref)
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{
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	struct ceph_osd_request *req = container_of(kref,
						    struct ceph_osd_request,
						    r_kref);

	if (req->r_request)
		ceph_msg_put(req->r_request);
	if (req->r_reply)
		ceph_msg_put(req->r_reply);
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	if (req->r_con_filling_msg) {
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		dout("release_request revoking pages %p from con %p\n",
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		     req->r_pages, req->r_con_filling_msg);
		ceph_con_revoke_message(req->r_con_filling_msg,
				      req->r_reply);
		ceph_con_put(req->r_con_filling_msg);
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	}
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	if (req->r_own_pages)
		ceph_release_page_vector(req->r_pages,
					 req->r_num_pages);
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#ifdef CONFIG_BLOCK
	if (req->r_bio)
		bio_put(req->r_bio);
#endif
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	ceph_put_snap_context(req->r_snapc);
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	if (req->r_trail) {
		ceph_pagelist_release(req->r_trail);
		kfree(req->r_trail);
	}
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	if (req->r_mempool)
		mempool_free(req, req->r_osdc->req_mempool);
	else
		kfree(req);
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}
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EXPORT_SYMBOL(ceph_osdc_release_request);
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static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail)
{
	int i = 0;

	if (needs_trail)
		*needs_trail = 0;
	while (ops[i].op) {
		if (needs_trail && op_needs_trail(ops[i].op))
			*needs_trail = 1;
		i++;
	}

	return i;
}

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struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
					       int flags,
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					       struct ceph_snap_context *snapc,
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					       struct ceph_osd_req_op *ops,
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					       bool use_mempool,
					       gfp_t gfp_flags,
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					       struct page **pages,
					       struct bio *bio)
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{
	struct ceph_osd_request *req;
	struct ceph_msg *msg;
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	int needs_trail;
	int num_op = get_num_ops(ops, &needs_trail);
	size_t msg_size = sizeof(struct ceph_osd_request_head);
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	msg_size += num_op*sizeof(struct ceph_osd_op);
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	if (use_mempool) {
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		req = mempool_alloc(osdc->req_mempool, gfp_flags);
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		memset(req, 0, sizeof(*req));
	} else {
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		req = kzalloc(sizeof(*req), gfp_flags);
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	}
	if (req == NULL)
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		return NULL;
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	req->r_osdc = osdc;
	req->r_mempool = use_mempool;
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	kref_init(&req->r_kref);
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	init_completion(&req->r_completion);
	init_completion(&req->r_safe_completion);
	INIT_LIST_HEAD(&req->r_unsafe_item);
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	INIT_LIST_HEAD(&req->r_linger_item);
	INIT_LIST_HEAD(&req->r_linger_osd);
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	req->r_flags = flags;

	WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);

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	/* create reply message */
	if (use_mempool)
		msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
	else
		msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
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				   OSD_OPREPLY_FRONT_LEN, gfp_flags);
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	if (!msg) {
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		ceph_osdc_put_request(req);
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		return NULL;
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	}
	req->r_reply = msg;

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	/* allocate space for the trailing data */
	if (needs_trail) {
		req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
		if (!req->r_trail) {
			ceph_osdc_put_request(req);
			return NULL;
		}
		ceph_pagelist_init(req->r_trail);
	}
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	/* create request message; allow space for oid */
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	msg_size += 40;
	if (snapc)
		msg_size += sizeof(u64) * snapc->num_snaps;
	if (use_mempool)
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		msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
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	else
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		msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags);
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	if (!msg) {
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		ceph_osdc_put_request(req);
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		return NULL;
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	}
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	msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
	memset(msg->front.iov_base, 0, msg->front.iov_len);
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	req->r_request = msg;
	req->r_pages = pages;
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#ifdef CONFIG_BLOCK
	if (bio) {
		req->r_bio = bio;
		bio_get(req->r_bio);
	}
#endif
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	return req;
}
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EXPORT_SYMBOL(ceph_osdc_alloc_request);
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static void osd_req_encode_op(struct ceph_osd_request *req,
			      struct ceph_osd_op *dst,
			      struct ceph_osd_req_op *src)
{
	dst->op = cpu_to_le16(src->op);

	switch (dst->op) {
	case CEPH_OSD_OP_READ:
	case CEPH_OSD_OP_WRITE:
		dst->extent.offset =
			cpu_to_le64(src->extent.offset);
		dst->extent.length =
			cpu_to_le64(src->extent.length);
		dst->extent.truncate_size =
			cpu_to_le64(src->extent.truncate_size);
		dst->extent.truncate_seq =
			cpu_to_le32(src->extent.truncate_seq);
		break;

	case CEPH_OSD_OP_GETXATTR:
	case CEPH_OSD_OP_SETXATTR:
	case CEPH_OSD_OP_CMPXATTR:
		BUG_ON(!req->r_trail);

		dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
		dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
		dst->xattr.cmp_op = src->xattr.cmp_op;
		dst->xattr.cmp_mode = src->xattr.cmp_mode;
		ceph_pagelist_append(req->r_trail, src->xattr.name,
				     src->xattr.name_len);
		ceph_pagelist_append(req->r_trail, src->xattr.val,
				     src->xattr.value_len);
		break;
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	case CEPH_OSD_OP_CALL:
		BUG_ON(!req->r_trail);

		dst->cls.class_len = src->cls.class_len;
		dst->cls.method_len = src->cls.method_len;
		dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);

		ceph_pagelist_append(req->r_trail, src->cls.class_name,
				     src->cls.class_len);
		ceph_pagelist_append(req->r_trail, src->cls.method_name,
				     src->cls.method_len);
		ceph_pagelist_append(req->r_trail, src->cls.indata,
				     src->cls.indata_len);
		break;
	case CEPH_OSD_OP_ROLLBACK:
		dst->snap.snapid = cpu_to_le64(src->snap.snapid);
		break;
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	case CEPH_OSD_OP_STARTSYNC:
		break;
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	case CEPH_OSD_OP_NOTIFY:
		{
			__le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
			__le32 timeout = cpu_to_le32(src->watch.timeout);

			BUG_ON(!req->r_trail);

			ceph_pagelist_append(req->r_trail,
						&prot_ver, sizeof(prot_ver));
			ceph_pagelist_append(req->r_trail,
						&timeout, sizeof(timeout));
		}
	case CEPH_OSD_OP_NOTIFY_ACK:
	case CEPH_OSD_OP_WATCH:
		dst->watch.cookie = cpu_to_le64(src->watch.cookie);
		dst->watch.ver = cpu_to_le64(src->watch.ver);
		dst->watch.flag = src->watch.flag;
		break;
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	default:
		pr_err("unrecognized osd opcode %d\n", dst->op);
		WARN_ON(1);
		break;
	}
	dst->payload_len = cpu_to_le32(src->payload_len);
}

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/*
 * build new request AND message
 *
 */
void ceph_osdc_build_request(struct ceph_osd_request *req,
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			     u64 off, u64 *plen,
			     struct ceph_osd_req_op *src_ops,
			     struct ceph_snap_context *snapc,
			     struct timespec *mtime,
			     const char *oid,
			     int oid_len)
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{
	struct ceph_msg *msg = req->r_request;
	struct ceph_osd_request_head *head;
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	struct ceph_osd_req_op *src_op;
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	struct ceph_osd_op *op;
	void *p;
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	int num_op = get_num_ops(src_ops, NULL);
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	size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
	int flags = req->r_flags;
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	u64 data_len = 0;
	int i;
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	head = msg->front.iov_base;
	op = (void *)(head + 1);
	p = (void *)(op + num_op);

	req->r_snapc = ceph_get_snap_context(snapc);

	head->client_inc = cpu_to_le32(1); /* always, for now. */
	head->flags = cpu_to_le32(flags);
	if (flags & CEPH_OSD_FLAG_WRITE)
		ceph_encode_timespec(&head->mtime, mtime);
	head->num_ops = cpu_to_le16(num_op);


	/* fill in oid */
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	head->object_len = cpu_to_le32(oid_len);
	memcpy(p, oid, oid_len);
	p += oid_len;
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	src_op = src_ops;
	while (src_op->op) {
		osd_req_encode_op(req, op, src_op);
		src_op++;
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		op++;
	}
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	if (req->r_trail)
		data_len += req->r_trail->length;

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	if (snapc) {
		head->snap_seq = cpu_to_le64(snapc->seq);
		head->num_snaps = cpu_to_le32(snapc->num_snaps);
		for (i = 0; i < snapc->num_snaps; i++) {
			put_unaligned_le64(snapc->snaps[i], p);
			p += sizeof(u64);
		}
	}

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	if (flags & CEPH_OSD_FLAG_WRITE) {
		req->r_request->hdr.data_off = cpu_to_le16(off);
		req->r_request->hdr.data_len = cpu_to_le32(*plen + data_len);
	} else if (data_len) {
		req->r_request->hdr.data_off = 0;
		req->r_request->hdr.data_len = cpu_to_le32(data_len);
	}

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	req->r_request->page_alignment = req->r_page_alignment;

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	BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
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	msg_size = p - msg->front.iov_base;
	msg->front.iov_len = msg_size;
	msg->hdr.front_len = cpu_to_le32(msg_size);
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	return;
}
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EXPORT_SYMBOL(ceph_osdc_build_request);
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/*
 * build new request AND message, calculate layout, and adjust file
 * extent as needed.
 *
 * if the file was recently truncated, we include information about its
 * old and new size so that the object can be updated appropriately.  (we
 * avoid synchronously deleting truncated objects because it's slow.)
 *
 * if @do_sync, include a 'startsync' command so that the osd will flush
 * data quickly.
 */
struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
					       struct ceph_file_layout *layout,
					       struct ceph_vino vino,
					       u64 off, u64 *plen,
					       int opcode, int flags,
					       struct ceph_snap_context *snapc,
					       int do_sync,
					       u32 truncate_seq,
					       u64 truncate_size,
					       struct timespec *mtime,
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					       bool use_mempool, int num_reply,
					       int page_align)
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{
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	struct ceph_osd_req_op ops[3];
	struct ceph_osd_request *req;

	ops[0].op = opcode;
	ops[0].extent.truncate_seq = truncate_seq;
	ops[0].extent.truncate_size = truncate_size;
	ops[0].payload_len = 0;

	if (do_sync) {
		ops[1].op = CEPH_OSD_OP_STARTSYNC;
		ops[1].payload_len = 0;
		ops[2].op = 0;
	} else
		ops[1].op = 0;

	req = ceph_osdc_alloc_request(osdc, flags,
					 snapc, ops,
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					 use_mempool,
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					 GFP_NOFS, NULL, NULL);
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	if (!req)
		return NULL;
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	/* calculate max write size */
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	calc_layout(osdc, vino, layout, off, plen, req, ops);
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	req->r_file_layout = *layout;  /* keep a copy */

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	/* in case it differs from natural (file) alignment that
	   calc_layout filled in for us */
	req->r_num_pages = calc_pages_for(page_align, *plen);
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	req->r_page_alignment = page_align;

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	ceph_osdc_build_request(req, off, plen, ops,
				snapc,
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				mtime,
				req->r_oid, req->r_oid_len);

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	return req;
}
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EXPORT_SYMBOL(ceph_osdc_new_request);
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/*
 * We keep osd requests in an rbtree, sorted by ->r_tid.
 */
static void __insert_request(struct ceph_osd_client *osdc,
			     struct ceph_osd_request *new)
{
	struct rb_node **p = &osdc->requests.rb_node;
	struct rb_node *parent = NULL;
	struct ceph_osd_request *req = NULL;

	while (*p) {
		parent = *p;
		req = rb_entry(parent, struct ceph_osd_request, r_node);
		if (new->r_tid < req->r_tid)
			p = &(*p)->rb_left;
		else if (new->r_tid > req->r_tid)
			p = &(*p)->rb_right;
		else
			BUG();
	}

	rb_link_node(&new->r_node, parent, p);
	rb_insert_color(&new->r_node, &osdc->requests);
}

static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
						 u64 tid)
{
	struct ceph_osd_request *req;
	struct rb_node *n = osdc->requests.rb_node;

	while (n) {
		req = rb_entry(n, struct ceph_osd_request, r_node);
		if (tid < req->r_tid)
			n = n->rb_left;
		else if (tid > req->r_tid)
			n = n->rb_right;
		else
			return req;
	}
	return NULL;
}

static struct ceph_osd_request *
__lookup_request_ge(struct ceph_osd_client *osdc,
		    u64 tid)
{
	struct ceph_osd_request *req;
	struct rb_node *n = osdc->requests.rb_node;

	while (n) {
		req = rb_entry(n, struct ceph_osd_request, r_node);
		if (tid < req->r_tid) {
			if (!n->rb_left)
				return req;
			n = n->rb_left;
		} else if (tid > req->r_tid) {
			n = n->rb_right;
		} else {
			return req;
		}
	}
	return NULL;
}

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/*
 * Resubmit requests pending on the given osd.
 */
static void __kick_osd_requests(struct ceph_osd_client *osdc,
				struct ceph_osd *osd)
{
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	struct ceph_osd_request *req, *nreq;
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	int err;

	dout("__kick_osd_requests osd%d\n", osd->o_osd);
	err = __reset_osd(osdc, osd);
	if (err == -EAGAIN)
		return;

	list_for_each_entry(req, &osd->o_requests, r_osd_item) {
		list_move(&req->r_req_lru_item, &osdc->req_unsent);
		dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
		     osd->o_osd);
577 578 579 580 581 582
		if (!req->r_linger)
			req->r_flags |= CEPH_OSD_FLAG_RETRY;
	}

	list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
				 r_linger_osd) {
583 584 585 586 587
		/*
		 * reregister request prior to unregistering linger so
		 * that r_osd is preserved.
		 */
		BUG_ON(!list_empty(&req->r_req_lru_item));
588
		__register_request(osdc, req);
589 590 591
		list_add(&req->r_req_lru_item, &osdc->req_unsent);
		list_add(&req->r_osd_item, &req->r_osd->o_requests);
		__unregister_linger_request(osdc, req);
592 593
		dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
		     osd->o_osd);
594 595 596 597 598 599 600 601 602 603
	}
}

static void kick_osd_requests(struct ceph_osd_client *osdc,
			      struct ceph_osd *kickosd)
{
	mutex_lock(&osdc->request_mutex);
	__kick_osd_requests(osdc, kickosd);
	mutex_unlock(&osdc->request_mutex);
}
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/*
606
 * If the osd connection drops, we need to resubmit all requests.
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 */
static void osd_reset(struct ceph_connection *con)
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc;

	if (!osd)
		return;
	dout("osd_reset osd%d\n", osd->o_osd);
	osdc = osd->o_osdc;
	down_read(&osdc->map_sem);
618 619
	kick_osd_requests(osdc, osd);
	send_queued(osdc);
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	up_read(&osdc->map_sem);
}

/*
 * Track open sessions with osds.
 */
static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
{
	struct ceph_osd *osd;

	osd = kzalloc(sizeof(*osd), GFP_NOFS);
	if (!osd)
		return NULL;

	atomic_set(&osd->o_ref, 1);
	osd->o_osdc = osdc;
	INIT_LIST_HEAD(&osd->o_requests);
637
	INIT_LIST_HEAD(&osd->o_linger_requests);
638
	INIT_LIST_HEAD(&osd->o_osd_lru);
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	osd->o_incarnation = 1;

	ceph_con_init(osdc->client->msgr, &osd->o_con);
	osd->o_con.private = osd;
	osd->o_con.ops = &osd_con_ops;
	osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
645

646
	INIT_LIST_HEAD(&osd->o_keepalive_item);
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	return osd;
}

static struct ceph_osd *get_osd(struct ceph_osd *osd)
{
	if (atomic_inc_not_zero(&osd->o_ref)) {
		dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
		     atomic_read(&osd->o_ref));
		return osd;
	} else {
		dout("get_osd %p FAIL\n", osd);
		return NULL;
	}
}

static void put_osd(struct ceph_osd *osd)
{
	dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
	     atomic_read(&osd->o_ref) - 1);
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	if (atomic_dec_and_test(&osd->o_ref)) {
		struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;

		if (osd->o_authorizer)
			ac->ops->destroy_authorizer(ac, osd->o_authorizer);
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		kfree(osd);
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	}
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}

/*
 * remove an osd from our map
 */
678
static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
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679
{
680
	dout("__remove_osd %p\n", osd);
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	BUG_ON(!list_empty(&osd->o_requests));
	rb_erase(&osd->o_node, &osdc->osds);
683
	list_del_init(&osd->o_osd_lru);
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	ceph_con_close(&osd->o_con);
	put_osd(osd);
}

688 689 690 691 692 693 694 695 696 697 698 699
static void remove_all_osds(struct ceph_osd_client *osdc)
{
	dout("__remove_old_osds %p\n", osdc);
	mutex_lock(&osdc->request_mutex);
	while (!RB_EMPTY_ROOT(&osdc->osds)) {
		struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
						struct ceph_osd, o_node);
		__remove_osd(osdc, osd);
	}
	mutex_unlock(&osdc->request_mutex);
}

700 701 702 703 704 705
static void __move_osd_to_lru(struct ceph_osd_client *osdc,
			      struct ceph_osd *osd)
{
	dout("__move_osd_to_lru %p\n", osd);
	BUG_ON(!list_empty(&osd->o_osd_lru));
	list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
706
	osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
707 708 709 710 711 712 713 714 715
}

static void __remove_osd_from_lru(struct ceph_osd *osd)
{
	dout("__remove_osd_from_lru %p\n", osd);
	if (!list_empty(&osd->o_osd_lru))
		list_del_init(&osd->o_osd_lru);
}

716
static void remove_old_osds(struct ceph_osd_client *osdc)
717 718 719 720 721 722
{
	struct ceph_osd *osd, *nosd;

	dout("__remove_old_osds %p\n", osdc);
	mutex_lock(&osdc->request_mutex);
	list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
723
		if (time_before(jiffies, osd->lru_ttl))
724 725 726 727 728 729
			break;
		__remove_osd(osdc, osd);
	}
	mutex_unlock(&osdc->request_mutex);
}

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/*
 * reset osd connect
 */
733
static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
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{
735
	struct ceph_osd_request *req;
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	int ret = 0;

738
	dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
739 740
	if (list_empty(&osd->o_requests) &&
	    list_empty(&osd->o_linger_requests)) {
741
		__remove_osd(osdc, osd);
742 743 744 745 746 747 748 749 750 751
	} else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
			  &osd->o_con.peer_addr,
			  sizeof(osd->o_con.peer_addr)) == 0 &&
		   !ceph_con_opened(&osd->o_con)) {
		dout(" osd addr hasn't changed and connection never opened,"
		     " letting msgr retry");
		/* touch each r_stamp for handle_timeout()'s benfit */
		list_for_each_entry(req, &osd->o_requests, r_osd_item)
			req->r_stamp = jiffies;
		ret = -EAGAIN;
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	} else {
		ceph_con_close(&osd->o_con);
		ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
		osd->o_incarnation++;
	}
	return ret;
}

static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
{
	struct rb_node **p = &osdc->osds.rb_node;
	struct rb_node *parent = NULL;
	struct ceph_osd *osd = NULL;

766
	dout("__insert_osd %p osd%d\n", new, new->o_osd);
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	while (*p) {
		parent = *p;
		osd = rb_entry(parent, struct ceph_osd, o_node);
		if (new->o_osd < osd->o_osd)
			p = &(*p)->rb_left;
		else if (new->o_osd > osd->o_osd)
			p = &(*p)->rb_right;
		else
			BUG();
	}

	rb_link_node(&new->o_node, parent, p);
	rb_insert_color(&new->o_node, &osdc->osds);
}

static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
{
	struct ceph_osd *osd;
	struct rb_node *n = osdc->osds.rb_node;

	while (n) {
		osd = rb_entry(n, struct ceph_osd, o_node);
		if (o < osd->o_osd)
			n = n->rb_left;
		else if (o > osd->o_osd)
			n = n->rb_right;
		else
			return osd;
	}
	return NULL;
}

799 800 801
static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
{
	schedule_delayed_work(&osdc->timeout_work,
802
			osdc->client->options->osd_keepalive_timeout * HZ);
803 804 805 806 807 808
}

static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
{
	cancel_delayed_work(&osdc->timeout_work);
}
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/*
 * Register request, assign tid.  If this is the first request, set up
 * the timeout event.
 */
814 815
static void __register_request(struct ceph_osd_client *osdc,
			       struct ceph_osd_request *req)
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{
	req->r_tid = ++osdc->last_tid;
818
	req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
819
	INIT_LIST_HEAD(&req->r_req_lru_item);
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821
	dout("__register_request %p tid %lld\n", req, req->r_tid);
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	__insert_request(osdc, req);
	ceph_osdc_get_request(req);
	osdc->num_requests++;

	if (osdc->num_requests == 1) {
827 828
		dout(" first request, scheduling timeout\n");
		__schedule_osd_timeout(osdc);
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	}
830 831 832 833 834 835 836
}

static void register_request(struct ceph_osd_client *osdc,
			     struct ceph_osd_request *req)
{
	mutex_lock(&osdc->request_mutex);
	__register_request(osdc, req);
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	mutex_unlock(&osdc->request_mutex);
}

/*
 * called under osdc->request_mutex
 */
static void __unregister_request(struct ceph_osd_client *osdc,
				 struct ceph_osd_request *req)
{
	dout("__unregister_request %p tid %lld\n", req, req->r_tid);
	rb_erase(&req->r_node, &osdc->requests);
	osdc->num_requests--;

850 851 852 853 854
	if (req->r_osd) {
		/* make sure the original request isn't in flight. */
		ceph_con_revoke(&req->r_osd->o_con, req->r_request);

		list_del_init(&req->r_osd_item);
855 856 857
		if (list_empty(&req->r_osd->o_requests) &&
		    list_empty(&req->r_osd->o_linger_requests)) {
			dout("moving osd to %p lru\n", req->r_osd);
858
			__move_osd_to_lru(osdc, req->r_osd);
859
		}
860
		if (list_empty(&req->r_linger_item))
861
			req->r_osd = NULL;
862
	}
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	ceph_osdc_put_request(req);

866 867 868 869
	list_del_init(&req->r_req_lru_item);
	if (osdc->num_requests == 0) {
		dout(" no requests, canceling timeout\n");
		__cancel_osd_timeout(osdc);
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	}
}

/*
 * Cancel a previously queued request message
 */
static void __cancel_request(struct ceph_osd_request *req)
{
878
	if (req->r_sent && req->r_osd) {
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		ceph_con_revoke(&req->r_osd->o_con, req->r_request);
		req->r_sent = 0;
	}
}

884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904
static void __register_linger_request(struct ceph_osd_client *osdc,
				    struct ceph_osd_request *req)
{
	dout("__register_linger_request %p\n", req);
	list_add_tail(&req->r_linger_item, &osdc->req_linger);
	list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
}

static void __unregister_linger_request(struct ceph_osd_client *osdc,
					struct ceph_osd_request *req)
{
	dout("__unregister_linger_request %p\n", req);
	if (req->r_osd) {
		list_del_init(&req->r_linger_item);
		list_del_init(&req->r_linger_osd);

		if (list_empty(&req->r_osd->o_requests) &&
		    list_empty(&req->r_osd->o_linger_requests)) {
			dout("moving osd to %p lru\n", req->r_osd);
			__move_osd_to_lru(osdc, req->r_osd);
		}
905 906
		if (list_empty(&req->r_osd_item))
			req->r_osd = NULL;
907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936
	}
}

void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
					 struct ceph_osd_request *req)
{
	mutex_lock(&osdc->request_mutex);
	if (req->r_linger) {
		__unregister_linger_request(osdc, req);
		ceph_osdc_put_request(req);
	}
	mutex_unlock(&osdc->request_mutex);
}
EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);

void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
				  struct ceph_osd_request *req)
{
	if (!req->r_linger) {
		dout("set_request_linger %p\n", req);
		req->r_linger = 1;
		/*
		 * caller is now responsible for calling
		 * unregister_linger_request
		 */
		ceph_osdc_get_request(req);
	}
}
EXPORT_SYMBOL(ceph_osdc_set_request_linger);

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/*
 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
 * (as needed), and set the request r_osd appropriately.  If there is
L
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 * no up osd, set r_osd to NULL.  Move the request to the appropriate list
941
 * (unsent, homeless) or leave on in-flight lru.
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942 943 944 945 946
 *
 * Return 0 if unchanged, 1 if changed, or negative on error.
 *
 * Caller should hold map_sem for read and request_mutex.
 */
947 948
static int __map_request(struct ceph_osd_client *osdc,
			 struct ceph_osd_request *req)
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949 950
{
	struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
951
	struct ceph_pg pgid;
952 953
	int acting[CEPH_PG_MAX_SIZE];
	int o = -1, num = 0;
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	int err;

956
	dout("map_request %p tid %lld\n", req, req->r_tid);
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	err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
				      &req->r_file_layout, osdc->osdmap);
959 960
	if (err) {
		list_move(&req->r_req_lru_item, &osdc->req_notarget);
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961
		return err;
962
	}
963
	pgid = reqhead->layout.ol_pgid;
964 965
	req->r_pgid = pgid;

966 967 968 969 970
	err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
	if (err > 0) {
		o = acting[0];
		num = err;
	}
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	if ((req->r_osd && req->r_osd->o_osd == o &&
973 974 975
	     req->r_sent >= req->r_osd->o_incarnation &&
	     req->r_num_pg_osds == num &&
	     memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
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	    (req->r_osd == NULL && o == -1))
		return 0;  /* no change */

979
	dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
980
	     req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
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	     req->r_osd ? req->r_osd->o_osd : -1);

983 984 985 986
	/* record full pg acting set */
	memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
	req->r_num_pg_osds = num;

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	if (req->r_osd) {
		__cancel_request(req);
		list_del_init(&req->r_osd_item);
		req->r_osd = NULL;
	}

	req->r_osd = __lookup_osd(osdc, o);
	if (!req->r_osd && o >= 0) {
995 996
		err = -ENOMEM;
		req->r_osd = create_osd(osdc);
997 998
		if (!req->r_osd) {
			list_move(&req->r_req_lru_item, &osdc->req_notarget);
999
			goto out;
1000
		}
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1002
		dout("map_request osd %p is osd%d\n", req->r_osd, o);
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		req->r_osd->o_osd = o;
		req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
		__insert_osd(osdc, req->r_osd);

		ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
	}

1010 1011
	if (req->r_osd) {
		__remove_osd_from_lru(req->r_osd);
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1012
		list_add(&req->r_osd_item, &req->r_osd->o_requests);
1013 1014 1015
		list_move(&req->r_req_lru_item, &osdc->req_unsent);
	} else {
		list_move(&req->r_req_lru_item, &osdc->req_notarget);
1016
	}
1017
	err = 1;   /* osd or pg changed */
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out:
	return err;
}

/*
 * caller should hold map_sem (for read) and request_mutex
 */
static int __send_request(struct ceph_osd_client *osdc,
			  struct ceph_osd_request *req)
{
	struct ceph_osd_request_head *reqhead;

	dout("send_request %p tid %llu to osd%d flags %d\n",
	     req, req->r_tid, req->r_osd->o_osd, req->r_flags);

	reqhead = req->r_request->front.iov_base;
	reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
	reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
	reqhead->reassert_version = req->r_reassert_version;

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1039
	req->r_stamp = jiffies;
1040
	list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
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1041 1042 1043 1044 1045 1046 1047

	ceph_msg_get(req->r_request); /* send consumes a ref */
	ceph_con_send(&req->r_osd->o_con, req->r_request);
	req->r_sent = req->r_osd->o_incarnation;
	return 0;
}

1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062
/*
 * Send any requests in the queue (req_unsent).
 */
static void send_queued(struct ceph_osd_client *osdc)
{
	struct ceph_osd_request *req, *tmp;

	dout("send_queued\n");
	mutex_lock(&osdc->request_mutex);
	list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
		__send_request(osdc, req);
	}
	mutex_unlock(&osdc->request_mutex);
}

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1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075
/*
 * Timeout callback, called every N seconds when 1 or more osd
 * requests has been active for more than N seconds.  When this
 * happens, we ping all OSDs with requests who have timed out to
 * ensure any communications channel reset is detected.  Reset the
 * request timeouts another N seconds in the future as we go.
 * Reschedule the timeout event another N seconds in future (unless
 * there are no open requests).
 */
static void handle_timeout(struct work_struct *work)
{
	struct ceph_osd_client *osdc =
		container_of(work, struct ceph_osd_client, timeout_work.work);
1076
	struct ceph_osd_request *req, *last_req = NULL;
S
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1077
	struct ceph_osd *osd;
1078
	unsigned long timeout = osdc->client->options->osd_timeout * HZ;
1079
	unsigned long keepalive =
1080
		osdc->client->options->osd_keepalive_timeout * HZ;
S
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1081
	unsigned long last_stamp = 0;
1082
	struct list_head slow_osds;
S
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1083 1084 1085 1086 1087 1088 1089
	dout("timeout\n");
	down_read(&osdc->map_sem);

	ceph_monc_request_next_osdmap(&osdc->client->monc);

	mutex_lock(&osdc->request_mutex);

1090 1091 1092 1093 1094 1095 1096
	/*
	 * reset osds that appear to be _really_ unresponsive.  this
	 * is a failsafe measure.. we really shouldn't be getting to
	 * this point if the system is working properly.  the monitors
	 * should mark the osd as failed and we should find out about
	 * it from an updated osd map.
	 */
S
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1097
	while (timeout && !list_empty(&osdc->req_lru)) {
1098 1099 1100
		req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
				 r_req_lru_item);

1101
		/* hasn't been long enough since we sent it? */
S
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1102
		if (time_before(jiffies, req->r_stamp + timeout))
1103
			break;
1104 1105 1106 1107 1108

		/* hasn't been long enough since it was acked? */
		if (req->r_request->ack_stamp == 0 ||
		    time_before(jiffies, req->r_request->ack_stamp + timeout))
			break;
1109

S
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1110
		BUG_ON(req == last_req && req->r_stamp == last_stamp);
1111
		last_req = req;
S
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1112
		last_stamp = req->r_stamp;
1113 1114 1115 1116 1117

		osd = req->r_osd;
		BUG_ON(!osd);
		pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
			   req->r_tid, osd->o_osd);
1118
		__kick_osd_requests(osdc, osd);
1119 1120 1121 1122 1123 1124 1125 1126 1127
	}

	/*
	 * ping osds that are a bit slow.  this ensures that if there
	 * is a break in the TCP connection we will notice, and reopen
	 * a connection with that osd (from the fault callback).
	 */
	INIT_LIST_HEAD(&slow_osds);
	list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
S
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1128
		if (time_before(jiffies, req->r_stamp + keepalive))
1129 1130 1131 1132 1133
			break;

		osd = req->r_osd;
		BUG_ON(!osd);
		dout(" tid %llu is slow, will send keepalive on osd%d\n",
S
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1134
		     req->r_tid, osd->o_osd);
1135 1136 1137 1138 1139 1140
		list_move_tail(&osd->o_keepalive_item, &slow_osds);
	}
	while (!list_empty(&slow_osds)) {
		osd = list_entry(slow_osds.next, struct ceph_osd,
				 o_keepalive_item);
		list_del_init(&osd->o_keepalive_item);
S
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1141 1142 1143
		ceph_con_keepalive(&osd->o_con);
	}

1144
	__schedule_osd_timeout(osdc);
S
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1145
	mutex_unlock(&osdc->request_mutex);
1146
	send_queued(osdc);
S
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1147 1148 1149
	up_read(&osdc->map_sem);
}

1150 1151 1152 1153 1154 1155
static void handle_osds_timeout(struct work_struct *work)
{
	struct ceph_osd_client *osdc =
		container_of(work, struct ceph_osd_client,
			     osds_timeout_work.work);
	unsigned long delay =
1156
		osdc->client->options->osd_idle_ttl * HZ >> 2;
1157 1158 1159

	dout("osds timeout\n");
	down_read(&osdc->map_sem);
1160
	remove_old_osds(osdc);
1161 1162 1163 1164 1165 1166
	up_read(&osdc->map_sem);

	schedule_delayed_work(&osdc->osds_timeout_work,
			      round_jiffies_relative(delay));
}

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1167 1168 1169 1170 1171 1172 1173
static void complete_request(struct ceph_osd_request *req)
{
	if (req->r_safe_callback)
		req->r_safe_callback(req, NULL);
	complete_all(&req->r_safe_completion);  /* fsync waiter */
}

S
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1174 1175 1176 1177
/*
 * handle osd op reply.  either call the callback if it is specified,
 * or do the completion to wake up the waiting thread.
 */
1178 1179
static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
			 struct ceph_connection *con)
S
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1180 1181 1182 1183 1184
{
	struct ceph_osd_reply_head *rhead = msg->front.iov_base;
	struct ceph_osd_request *req;
	u64 tid;
	int numops, object_len, flags;
1185
	s32 result;
S
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1186

1187
	tid = le64_to_cpu(msg->hdr.tid);
S
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1188 1189 1190 1191
	if (msg->front.iov_len < sizeof(*rhead))
		goto bad;
	numops = le32_to_cpu(rhead->num_ops);
	object_len = le32_to_cpu(rhead->object_len);
1192
	result = le32_to_cpu(rhead->result);
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1193 1194 1195
	if (msg->front.iov_len != sizeof(*rhead) + object_len +
	    numops * sizeof(struct ceph_osd_op))
		goto bad;
1196
	dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
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1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207
	/* lookup */
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (req == NULL) {
		dout("handle_reply tid %llu dne\n", tid);
		mutex_unlock(&osdc->request_mutex);
		return;
	}
	ceph_osdc_get_request(req);
	flags = le32_to_cpu(rhead->flags);

1208
	/*
1209
	 * if this connection filled our message, drop our reference now, to
1210 1211
	 * avoid a (safe but slower) revoke later.
	 */
1212
	if (req->r_con_filling_msg == con && req->r_reply == msg) {
S
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1213
		dout(" dropping con_filling_msg ref %p\n", con);
1214
		req->r_con_filling_msg = NULL;
1215 1216 1217
		ceph_con_put(con);
	}

S
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1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
	if (!req->r_got_reply) {
		unsigned bytes;

		req->r_result = le32_to_cpu(rhead->result);
		bytes = le32_to_cpu(msg->hdr.data_len);
		dout("handle_reply result %d bytes %d\n", req->r_result,
		     bytes);
		if (req->r_result == 0)
			req->r_result = bytes;

		/* in case this is a write and we need to replay, */
		req->r_reassert_version = rhead->reassert_version;

		req->r_got_reply = 1;
	} else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
		dout("handle_reply tid %llu dup ack\n", tid);
S
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1234
		mutex_unlock(&osdc->request_mutex);
S
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1235 1236 1237 1238 1239
		goto done;
	}

	dout("handle_reply tid %llu flags %d\n", tid, flags);

1240 1241 1242
	if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
		__register_linger_request(osdc, req);

S
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1243
	/* either this is a read, or we got the safe response */
1244 1245
	if (result < 0 ||
	    (flags & CEPH_OSD_FLAG_ONDISK) ||
S
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1246 1247 1248 1249 1250 1251 1252 1253
	    ((flags & CEPH_OSD_FLAG_WRITE) == 0))
		__unregister_request(osdc, req);

	mutex_unlock(&osdc->request_mutex);

	if (req->r_callback)
		req->r_callback(req, msg);
	else
1254
		complete_all(&req->r_completion);
S
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1255

S
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1256 1257
	if (flags & CEPH_OSD_FLAG_ONDISK)
		complete_request(req);
S
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1258 1259

done:
1260
	dout("req=%p req->r_linger=%d\n", req, req->r_linger);
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1261 1262 1263 1264 1265 1266 1267
	ceph_osdc_put_request(req);
	return;

bad:
	pr_err("corrupt osd_op_reply got %d %d expected %d\n",
	       (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
	       (int)sizeof(*rhead));
1268
	ceph_msg_dump(msg);
S
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1269 1270
}

1271
static void reset_changed_osds(struct ceph_osd_client *osdc)
S
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1272 1273 1274
{
	struct rb_node *p, *n;

1275 1276
	for (p = rb_first(&osdc->osds); p; p = n) {
		struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
S
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1277

1278 1279 1280 1281 1282 1283 1284
		n = rb_next(p);
		if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
		    memcmp(&osd->o_con.peer_addr,
			   ceph_osd_addr(osdc->osdmap,
					 osd->o_osd),
			   sizeof(struct ceph_entity_addr)) != 0)
			__reset_osd(osdc, osd);
S
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1285
	}
1286 1287 1288
}

/*
1289 1290
 * Requeue requests whose mapping to an OSD has changed.  If requests map to
 * no osd, request a new map.
1291 1292 1293
 *
 * Caller should hold map_sem for read and request_mutex.
 */
1294
static void kick_requests(struct ceph_osd_client *osdc)
1295
{
1296
	struct ceph_osd_request *req, *nreq;
1297 1298 1299
	struct rb_node *p;
	int needmap = 0;
	int err;
1300

1301
	dout("kick_requests\n");
1302
	mutex_lock(&osdc->request_mutex);
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313
	for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
		req = rb_entry(p, struct ceph_osd_request, r_node);
		err = __map_request(osdc, req);
		if (err < 0)
			continue;  /* error */
		if (req->r_osd == NULL) {
			dout("%p tid %llu maps to no osd\n", req, req->r_tid);
			needmap++;  /* request a newer map */
		} else if (err > 0) {
			dout("%p tid %llu requeued on osd%d\n", req, req->r_tid,
			     req->r_osd ? req->r_osd->o_osd : -1);
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
			if (!req->r_linger)
				req->r_flags |= CEPH_OSD_FLAG_RETRY;
		}
	}

	list_for_each_entry_safe(req, nreq, &osdc->req_linger,
				 r_linger_item) {
		dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);

		err = __map_request(osdc, req);
		if (err == 0)
			continue;  /* no change and no osd was specified */
		if (err < 0)
			continue;  /* hrm! */
		if (req->r_osd == NULL) {
			dout("tid %llu maps to no valid osd\n", req->r_tid);
			needmap++;  /* request a newer map */
			continue;
1332
		}
1333 1334 1335 1336 1337

		dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
		     req->r_osd ? req->r_osd->o_osd : -1);
		__unregister_linger_request(osdc, req);
		__register_request(osdc, req);
1338
	}
S
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1339 1340 1341 1342 1343 1344
	mutex_unlock(&osdc->request_mutex);

	if (needmap) {
		dout("%d requests for down osds, need new map\n", needmap);
		ceph_monc_request_next_osdmap(&osdc->client->monc);
	}
1345
}
1346 1347


S
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1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370
/*
 * Process updated osd map.
 *
 * The message contains any number of incremental and full maps, normally
 * indicating some sort of topology change in the cluster.  Kick requests
 * off to different OSDs as needed.
 */
void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
{
	void *p, *end, *next;
	u32 nr_maps, maplen;
	u32 epoch;
	struct ceph_osdmap *newmap = NULL, *oldmap;
	int err;
	struct ceph_fsid fsid;

	dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
	p = msg->front.iov_base;
	end = p + msg->front.iov_len;

	/* verify fsid */
	ceph_decode_need(&p, end, sizeof(fsid), bad);
	ceph_decode_copy(&p, &fsid, sizeof(fsid));
1371 1372
	if (ceph_check_fsid(osdc->client, &fsid) < 0)
		return;
S
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1373 1374 1375 1376 1377 1378 1379 1380

	down_write(&osdc->map_sem);

	/* incremental maps */
	ceph_decode_32_safe(&p, end, nr_maps, bad);
	dout(" %d inc maps\n", nr_maps);
	while (nr_maps > 0) {
		ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1381 1382
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394
		ceph_decode_need(&p, end, maplen, bad);
		next = p + maplen;
		if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
			dout("applying incremental map %u len %d\n",
			     epoch, maplen);
			newmap = osdmap_apply_incremental(&p, next,
							  osdc->osdmap,
							  osdc->client->msgr);
			if (IS_ERR(newmap)) {
				err = PTR_ERR(newmap);
				goto bad;
			}
1395
			BUG_ON(!newmap);
S
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1396 1397 1398 1399
			if (newmap != osdc->osdmap) {
				ceph_osdmap_destroy(osdc->osdmap);
				osdc->osdmap = newmap;
			}
1400 1401
			kick_requests(osdc);
			reset_changed_osds(osdc);
S
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1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416
		} else {
			dout("ignoring incremental map %u len %d\n",
			     epoch, maplen);
		}
		p = next;
		nr_maps--;
	}
	if (newmap)
		goto done;

	/* full maps */
	ceph_decode_32_safe(&p, end, nr_maps, bad);
	dout(" %d full maps\n", nr_maps);
	while (nr_maps) {
		ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1417 1418
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433
		ceph_decode_need(&p, end, maplen, bad);
		if (nr_maps > 1) {
			dout("skipping non-latest full map %u len %d\n",
			     epoch, maplen);
		} else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
			dout("skipping full map %u len %d, "
			     "older than our %u\n", epoch, maplen,
			     osdc->osdmap->epoch);
		} else {
			dout("taking full map %u len %d\n", epoch, maplen);
			newmap = osdmap_decode(&p, p+maplen);
			if (IS_ERR(newmap)) {
				err = PTR_ERR(newmap);
				goto bad;
			}
1434
			BUG_ON(!newmap);
S
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1435 1436 1437 1438
			oldmap = osdc->osdmap;
			osdc->osdmap = newmap;
			if (oldmap)
				ceph_osdmap_destroy(oldmap);
1439
			kick_requests(osdc);
S
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1440 1441 1442 1443 1444 1445 1446 1447
		}
		p += maplen;
		nr_maps--;
	}

done:
	downgrade_write(&osdc->map_sem);
	ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1448 1449 1450 1451 1452 1453 1454 1455 1456

	/*
	 * subscribe to subsequent osdmap updates if full to ensure
	 * we find out when we are no longer full and stop returning
	 * ENOSPC.
	 */
	if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
		ceph_monc_request_next_osdmap(&osdc->client->monc);

1457
	send_queued(osdc);
S
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1458
	up_read(&osdc->map_sem);
1459
	wake_up_all(&osdc->client->auth_wq);
S
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1460 1461 1462 1463
	return;

bad:
	pr_err("osdc handle_map corrupt msg\n");
1464
	ceph_msg_dump(msg);
S
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1465 1466 1467 1468
	up_write(&osdc->map_sem);
	return;
}

1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647
/*
 * watch/notify callback event infrastructure
 *
 * These callbacks are used both for watch and notify operations.
 */
static void __release_event(struct kref *kref)
{
	struct ceph_osd_event *event =
		container_of(kref, struct ceph_osd_event, kref);

	dout("__release_event %p\n", event);
	kfree(event);
}

static void get_event(struct ceph_osd_event *event)
{
	kref_get(&event->kref);
}

void ceph_osdc_put_event(struct ceph_osd_event *event)
{
	kref_put(&event->kref, __release_event);
}
EXPORT_SYMBOL(ceph_osdc_put_event);

static void __insert_event(struct ceph_osd_client *osdc,
			     struct ceph_osd_event *new)
{
	struct rb_node **p = &osdc->event_tree.rb_node;
	struct rb_node *parent = NULL;
	struct ceph_osd_event *event = NULL;

	while (*p) {
		parent = *p;
		event = rb_entry(parent, struct ceph_osd_event, node);
		if (new->cookie < event->cookie)
			p = &(*p)->rb_left;
		else if (new->cookie > event->cookie)
			p = &(*p)->rb_right;
		else
			BUG();
	}

	rb_link_node(&new->node, parent, p);
	rb_insert_color(&new->node, &osdc->event_tree);
}

static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
					        u64 cookie)
{
	struct rb_node **p = &osdc->event_tree.rb_node;
	struct rb_node *parent = NULL;
	struct ceph_osd_event *event = NULL;

	while (*p) {
		parent = *p;
		event = rb_entry(parent, struct ceph_osd_event, node);
		if (cookie < event->cookie)
			p = &(*p)->rb_left;
		else if (cookie > event->cookie)
			p = &(*p)->rb_right;
		else
			return event;
	}
	return NULL;
}

static void __remove_event(struct ceph_osd_event *event)
{
	struct ceph_osd_client *osdc = event->osdc;

	if (!RB_EMPTY_NODE(&event->node)) {
		dout("__remove_event removed %p\n", event);
		rb_erase(&event->node, &osdc->event_tree);
		ceph_osdc_put_event(event);
	} else {
		dout("__remove_event didn't remove %p\n", event);
	}
}

int ceph_osdc_create_event(struct ceph_osd_client *osdc,
			   void (*event_cb)(u64, u64, u8, void *),
			   int one_shot, void *data,
			   struct ceph_osd_event **pevent)
{
	struct ceph_osd_event *event;

	event = kmalloc(sizeof(*event), GFP_NOIO);
	if (!event)
		return -ENOMEM;

	dout("create_event %p\n", event);
	event->cb = event_cb;
	event->one_shot = one_shot;
	event->data = data;
	event->osdc = osdc;
	INIT_LIST_HEAD(&event->osd_node);
	kref_init(&event->kref);   /* one ref for us */
	kref_get(&event->kref);    /* one ref for the caller */
	init_completion(&event->completion);

	spin_lock(&osdc->event_lock);
	event->cookie = ++osdc->event_count;
	__insert_event(osdc, event);
	spin_unlock(&osdc->event_lock);

	*pevent = event;
	return 0;
}
EXPORT_SYMBOL(ceph_osdc_create_event);

void ceph_osdc_cancel_event(struct ceph_osd_event *event)
{
	struct ceph_osd_client *osdc = event->osdc;

	dout("cancel_event %p\n", event);
	spin_lock(&osdc->event_lock);
	__remove_event(event);
	spin_unlock(&osdc->event_lock);
	ceph_osdc_put_event(event); /* caller's */
}
EXPORT_SYMBOL(ceph_osdc_cancel_event);


static void do_event_work(struct work_struct *work)
{
	struct ceph_osd_event_work *event_work =
		container_of(work, struct ceph_osd_event_work, work);
	struct ceph_osd_event *event = event_work->event;
	u64 ver = event_work->ver;
	u64 notify_id = event_work->notify_id;
	u8 opcode = event_work->opcode;

	dout("do_event_work completing %p\n", event);
	event->cb(ver, notify_id, opcode, event->data);
	complete(&event->completion);
	dout("do_event_work completed %p\n", event);
	ceph_osdc_put_event(event);
	kfree(event_work);
}


/*
 * Process osd watch notifications
 */
void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
{
	void *p, *end;
	u8 proto_ver;
	u64 cookie, ver, notify_id;
	u8 opcode;
	struct ceph_osd_event *event;
	struct ceph_osd_event_work *event_work;

	p = msg->front.iov_base;
	end = p + msg->front.iov_len;

	ceph_decode_8_safe(&p, end, proto_ver, bad);
	ceph_decode_8_safe(&p, end, opcode, bad);
	ceph_decode_64_safe(&p, end, cookie, bad);
	ceph_decode_64_safe(&p, end, ver, bad);
	ceph_decode_64_safe(&p, end, notify_id, bad);

	spin_lock(&osdc->event_lock);
	event = __find_event(osdc, cookie);
	if (event) {
		get_event(event);
		if (event->one_shot)
			__remove_event(event);
	}
	spin_unlock(&osdc->event_lock);
	dout("handle_watch_notify cookie %lld ver %lld event %p\n",
	     cookie, ver, event);
	if (event) {
		event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
		if (!event_work) {
			dout("ERROR: could not allocate event_work\n");
			goto done_err;
		}
1648
		INIT_WORK(&event_work->work, do_event_work);
1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
		event_work->event = event;
		event_work->ver = ver;
		event_work->notify_id = notify_id;
		event_work->opcode = opcode;
		if (!queue_work(osdc->notify_wq, &event_work->work)) {
			dout("WARNING: failed to queue notify event work\n");
			goto done_err;
		}
	}

	return;

done_err:
	complete(&event->completion);
	ceph_osdc_put_event(event);
	return;

bad:
	pr_err("osdc handle_watch_notify corrupt msg\n");
	return;
}

int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
{
	int err;

	dout("wait_event %p\n", event);
	err = wait_for_completion_interruptible_timeout(&event->completion,
							timeout * HZ);
	ceph_osdc_put_event(event);
	if (err > 0)
		err = 0;
	dout("wait_event %p returns %d\n", event, err);
	return err;
}
EXPORT_SYMBOL(ceph_osdc_wait_event);

S
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1686 1687 1688 1689 1690 1691 1692
/*
 * Register request, send initial attempt.
 */
int ceph_osdc_start_request(struct ceph_osd_client *osdc,
			    struct ceph_osd_request *req,
			    bool nofail)
{
S
Sage Weil 已提交
1693
	int rc = 0;
S
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1694 1695 1696

	req->r_request->pages = req->r_pages;
	req->r_request->nr_pages = req->r_num_pages;
1697 1698 1699 1700
#ifdef CONFIG_BLOCK
	req->r_request->bio = req->r_bio;
#endif
	req->r_request->trail = req->r_trail;
S
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1701 1702 1703 1704 1705

	register_request(osdc, req);

	down_read(&osdc->map_sem);
	mutex_lock(&osdc->request_mutex);
S
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1706 1707 1708 1709 1710 1711
	/*
	 * a racing kick_requests() may have sent the message for us
	 * while we dropped request_mutex above, so only send now if
	 * the request still han't been touched yet.
	 */
	if (req->r_sent == 0) {
1712
		rc = __map_request(osdc, req);
1713 1714 1715 1716 1717 1718
		if (rc < 0) {
			if (nofail) {
				dout("osdc_start_request failed map, "
				     " will retry %lld\n", req->r_tid);
				rc = 0;
			}
1719
			goto out_unlock;
1720
		}
1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733
		if (req->r_osd == NULL) {
			dout("send_request %p no up osds in pg\n", req);
			ceph_monc_request_next_osdmap(&osdc->client->monc);
		} else {
			rc = __send_request(osdc, req);
			if (rc) {
				if (nofail) {
					dout("osdc_start_request failed send, "
					     " will retry %lld\n", req->r_tid);
					rc = 0;
				} else {
					__unregister_request(osdc, req);
				}
S
Sage Weil 已提交
1734
			}
S
Sage Weil 已提交
1735 1736
		}
	}
1737 1738

out_unlock:
S
Sage Weil 已提交
1739 1740 1741 1742
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
	return rc;
}
1743
EXPORT_SYMBOL(ceph_osdc_start_request);
S
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1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756

/*
 * wait for a request to complete
 */
int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req)
{
	int rc;

	rc = wait_for_completion_interruptible(&req->r_completion);
	if (rc < 0) {
		mutex_lock(&osdc->request_mutex);
		__cancel_request(req);
1757
		__unregister_request(osdc, req);
S
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1758
		mutex_unlock(&osdc->request_mutex);
S
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1759
		complete_request(req);
1760
		dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
S
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1761 1762 1763 1764 1765 1766
		return rc;
	}

	dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
	return req->r_result;
}
1767
EXPORT_SYMBOL(ceph_osdc_wait_request);
S
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1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800

/*
 * sync - wait for all in-flight requests to flush.  avoid starvation.
 */
void ceph_osdc_sync(struct ceph_osd_client *osdc)
{
	struct ceph_osd_request *req;
	u64 last_tid, next_tid = 0;

	mutex_lock(&osdc->request_mutex);
	last_tid = osdc->last_tid;
	while (1) {
		req = __lookup_request_ge(osdc, next_tid);
		if (!req)
			break;
		if (req->r_tid > last_tid)
			break;

		next_tid = req->r_tid + 1;
		if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
			continue;

		ceph_osdc_get_request(req);
		mutex_unlock(&osdc->request_mutex);
		dout("sync waiting on tid %llu (last is %llu)\n",
		     req->r_tid, last_tid);
		wait_for_completion(&req->r_safe_completion);
		mutex_lock(&osdc->request_mutex);
		ceph_osdc_put_request(req);
	}
	mutex_unlock(&osdc->request_mutex);
	dout("sync done (thru tid %llu)\n", last_tid);
}
1801
EXPORT_SYMBOL(ceph_osdc_sync);
S
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1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818

/*
 * init, shutdown
 */
int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
{
	int err;

	dout("init\n");
	osdc->client = client;
	osdc->osdmap = NULL;
	init_rwsem(&osdc->map_sem);
	init_completion(&osdc->map_waiters);
	osdc->last_requested_map = 0;
	mutex_init(&osdc->request_mutex);
	osdc->last_tid = 0;
	osdc->osds = RB_ROOT;
1819
	INIT_LIST_HEAD(&osdc->osd_lru);
S
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1820
	osdc->requests = RB_ROOT;
1821
	INIT_LIST_HEAD(&osdc->req_lru);
1822 1823
	INIT_LIST_HEAD(&osdc->req_unsent);
	INIT_LIST_HEAD(&osdc->req_notarget);
1824
	INIT_LIST_HEAD(&osdc->req_linger);
S
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1825 1826
	osdc->num_requests = 0;
	INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1827
	INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1828 1829 1830
	spin_lock_init(&osdc->event_lock);
	osdc->event_tree = RB_ROOT;
	osdc->event_count = 0;
1831 1832

	schedule_delayed_work(&osdc->osds_timeout_work,
1833
	   round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
S
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1834

1835
	err = -ENOMEM;
S
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1836 1837 1838
	osdc->req_mempool = mempool_create_kmalloc_pool(10,
					sizeof(struct ceph_osd_request));
	if (!osdc->req_mempool)
1839
		goto out;
S
Sage Weil 已提交
1840

1841 1842
	err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true,
				"osd_op");
S
Sage Weil 已提交
1843
	if (err < 0)
1844
		goto out_mempool;
S
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1845
	err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1846 1847
				OSD_OPREPLY_FRONT_LEN, 10, true,
				"osd_op_reply");
S
Sage Weil 已提交
1848 1849
	if (err < 0)
		goto out_msgpool;
1850 1851 1852 1853 1854 1855 1856

	osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
	if (IS_ERR(osdc->notify_wq)) {
		err = PTR_ERR(osdc->notify_wq);
		osdc->notify_wq = NULL;
		goto out_msgpool;
	}
S
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1857
	return 0;
1858

S
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1859 1860
out_msgpool:
	ceph_msgpool_destroy(&osdc->msgpool_op);
1861 1862 1863 1864
out_mempool:
	mempool_destroy(osdc->req_mempool);
out:
	return err;
S
Sage Weil 已提交
1865
}
1866
EXPORT_SYMBOL(ceph_osdc_init);
S
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1867 1868 1869

void ceph_osdc_stop(struct ceph_osd_client *osdc)
{
1870 1871
	flush_workqueue(osdc->notify_wq);
	destroy_workqueue(osdc->notify_wq);
S
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1872
	cancel_delayed_work_sync(&osdc->timeout_work);
1873
	cancel_delayed_work_sync(&osdc->osds_timeout_work);
S
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1874 1875 1876 1877
	if (osdc->osdmap) {
		ceph_osdmap_destroy(osdc->osdmap);
		osdc->osdmap = NULL;
	}
1878
	remove_all_osds(osdc);
S
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1879 1880
	mempool_destroy(osdc->req_mempool);
	ceph_msgpool_destroy(&osdc->msgpool_op);
S
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1881
	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
S
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1882
}
1883
EXPORT_SYMBOL(ceph_osdc_stop);
S
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1884 1885 1886 1887 1888 1889 1890 1891 1892

/*
 * Read some contiguous pages.  If we cross a stripe boundary, shorten
 * *plen.  Return number of bytes read, or error.
 */
int ceph_osdc_readpages(struct ceph_osd_client *osdc,
			struct ceph_vino vino, struct ceph_file_layout *layout,
			u64 off, u64 *plen,
			u32 truncate_seq, u64 truncate_size,
1893
			struct page **pages, int num_pages, int page_align)
S
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1894 1895 1896 1897 1898 1899 1900 1901 1902
{
	struct ceph_osd_request *req;
	int rc = 0;

	dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
	     vino.snap, off, *plen);
	req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
				    CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
				    NULL, 0, truncate_seq, truncate_size, NULL,
1903
				    false, 1, page_align);
1904 1905
	if (!req)
		return -ENOMEM;
S
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1906 1907 1908 1909

	/* it may be a short read due to an object boundary */
	req->r_pages = pages;

1910 1911
	dout("readpages  final extent is %llu~%llu (%d pages align %d)\n",
	     off, *plen, req->r_num_pages, page_align);
S
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1912 1913 1914 1915 1916 1917 1918 1919 1920

	rc = ceph_osdc_start_request(osdc, req, false);
	if (!rc)
		rc = ceph_osdc_wait_request(osdc, req);

	ceph_osdc_put_request(req);
	dout("readpages result %d\n", rc);
	return rc;
}
1921
EXPORT_SYMBOL(ceph_osdc_readpages);
S
Sage Weil 已提交
1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936

/*
 * do a synchronous write on N pages
 */
int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
			 struct ceph_file_layout *layout,
			 struct ceph_snap_context *snapc,
			 u64 off, u64 len,
			 u32 truncate_seq, u64 truncate_size,
			 struct timespec *mtime,
			 struct page **pages, int num_pages,
			 int flags, int do_sync, bool nofail)
{
	struct ceph_osd_request *req;
	int rc = 0;
1937
	int page_align = off & ~PAGE_MASK;
S
Sage Weil 已提交
1938 1939 1940 1941 1942 1943 1944 1945

	BUG_ON(vino.snap != CEPH_NOSNAP);
	req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
				    CEPH_OSD_OP_WRITE,
				    flags | CEPH_OSD_FLAG_ONDISK |
					    CEPH_OSD_FLAG_WRITE,
				    snapc, do_sync,
				    truncate_seq, truncate_size, mtime,
1946
				    nofail, 1, page_align);
1947 1948
	if (!req)
		return -ENOMEM;
S
Sage Weil 已提交
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964

	/* it may be a short write due to an object boundary */
	req->r_pages = pages;
	dout("writepages %llu~%llu (%d pages)\n", off, len,
	     req->r_num_pages);

	rc = ceph_osdc_start_request(osdc, req, nofail);
	if (!rc)
		rc = ceph_osdc_wait_request(osdc, req);

	ceph_osdc_put_request(req);
	if (rc == 0)
		rc = len;
	dout("writepages result %d\n", rc);
	return rc;
}
1965
EXPORT_SYMBOL(ceph_osdc_writepages);
S
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1966 1967 1968 1969 1970 1971 1972

/*
 * handle incoming message
 */
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
{
	struct ceph_osd *osd = con->private;
1973
	struct ceph_osd_client *osdc;
S
Sage Weil 已提交
1974 1975 1976
	int type = le16_to_cpu(msg->hdr.type);

	if (!osd)
S
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1977
		goto out;
1978
	osdc = osd->o_osdc;
S
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1979 1980 1981 1982 1983 1984

	switch (type) {
	case CEPH_MSG_OSD_MAP:
		ceph_osdc_handle_map(osdc, msg);
		break;
	case CEPH_MSG_OSD_OPREPLY:
1985
		handle_reply(osdc, msg, con);
S
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1986
		break;
1987 1988 1989
	case CEPH_MSG_WATCH_NOTIFY:
		handle_watch_notify(osdc, msg);
		break;
S
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1990 1991 1992 1993 1994

	default:
		pr_err("received unknown message type %d %s\n", type,
		       ceph_msg_type_name(type));
	}
S
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1995
out:
S
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1996 1997 1998
	ceph_msg_put(msg);
}

1999
/*
2000 2001
 * lookup and return message for incoming reply.  set up reply message
 * pages.
2002 2003
 */
static struct ceph_msg *get_reply(struct ceph_connection *con,
2004 2005
				  struct ceph_msg_header *hdr,
				  int *skip)
S
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2006 2007 2008
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc = osd->o_osdc;
2009
	struct ceph_msg *m;
2010
	struct ceph_osd_request *req;
2011 2012
	int front = le32_to_cpu(hdr->front_len);
	int data_len = le32_to_cpu(hdr->data_len);
2013
	u64 tid;
S
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2014

2015 2016 2017 2018 2019 2020
	tid = le64_to_cpu(hdr->tid);
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (!req) {
		*skip = 1;
		m = NULL;
S
Sage Weil 已提交
2021
		pr_info("get_reply unknown tid %llu from osd%d\n", tid,
2022
			osd->o_osd);
2023 2024
		goto out;
	}
S
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2025 2026 2027 2028 2029 2030

	if (req->r_con_filling_msg) {
		dout("get_reply revoking msg %p from old con %p\n",
		     req->r_reply, req->r_con_filling_msg);
		ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
		ceph_con_put(req->r_con_filling_msg);
2031
		req->r_con_filling_msg = NULL;
2032 2033
	}

S
Sage Weil 已提交
2034 2035 2036
	if (front > req->r_reply->front.iov_len) {
		pr_warning("get_reply front %d > preallocated %d\n",
			   front, (int)req->r_reply->front.iov_len);
2037
		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS);
2038
		if (!m)
S
Sage Weil 已提交
2039 2040 2041 2042 2043 2044
			goto out;
		ceph_msg_put(req->r_reply);
		req->r_reply = m;
	}
	m = ceph_msg_get(req->r_reply);

2045
	if (data_len > 0) {
2046
		int want = calc_pages_for(req->r_page_alignment, data_len);
2047 2048

		if (unlikely(req->r_num_pages < want)) {
2049 2050 2051
			pr_warning("tid %lld reply has %d bytes %d pages, we"
				   " had only %d pages ready\n", tid, data_len,
				   want, req->r_num_pages);
2052 2053
			*skip = 1;
			ceph_msg_put(m);
2054
			m = NULL;
2055
			goto out;
2056
		}
2057 2058
		m->pages = req->r_pages;
		m->nr_pages = req->r_num_pages;
2059
		m->page_alignment = req->r_page_alignment;
2060 2061 2062
#ifdef CONFIG_BLOCK
		m->bio = req->r_bio;
#endif
2063
	}
2064
	*skip = 0;
S
Sage Weil 已提交
2065 2066
	req->r_con_filling_msg = ceph_con_get(con);
	dout("get_reply tid %lld %p\n", tid, m);
2067 2068 2069

out:
	mutex_unlock(&osdc->request_mutex);
2070
	return m;
2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083

}

static struct ceph_msg *alloc_msg(struct ceph_connection *con,
				  struct ceph_msg_header *hdr,
				  int *skip)
{
	struct ceph_osd *osd = con->private;
	int type = le16_to_cpu(hdr->type);
	int front = le32_to_cpu(hdr->front_len);

	switch (type) {
	case CEPH_MSG_OSD_MAP:
2084
	case CEPH_MSG_WATCH_NOTIFY:
2085
		return ceph_msg_new(type, front, GFP_NOFS);
2086 2087 2088 2089 2090 2091 2092 2093
	case CEPH_MSG_OSD_OPREPLY:
		return get_reply(con, hdr, skip);
	default:
		pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
			osd->o_osd);
		*skip = 1;
		return NULL;
	}
S
Sage Weil 已提交
2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112
}

/*
 * Wrappers to refcount containing ceph_osd struct
 */
static struct ceph_connection *get_osd_con(struct ceph_connection *con)
{
	struct ceph_osd *osd = con->private;
	if (get_osd(osd))
		return con;
	return NULL;
}

static void put_osd_con(struct ceph_connection *con)
{
	struct ceph_osd *osd = con->private;
	put_osd(osd);
}

2113 2114 2115 2116
/*
 * authentication
 */
static int get_authorizer(struct ceph_connection *con,
S
Sage Weil 已提交
2117 2118
			  void **buf, int *len, int *proto,
			  void **reply_buf, int *reply_len, int force_new)
2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;
	int ret = 0;

	if (force_new && o->o_authorizer) {
		ac->ops->destroy_authorizer(ac, o->o_authorizer);
		o->o_authorizer = NULL;
	}
	if (o->o_authorizer == NULL) {
		ret = ac->ops->create_authorizer(
			ac, CEPH_ENTITY_TYPE_OSD,
			&o->o_authorizer,
			&o->o_authorizer_buf,
			&o->o_authorizer_buf_len,
			&o->o_authorizer_reply_buf,
			&o->o_authorizer_reply_buf_len);
		if (ret)
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			return ret;
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	}

	*proto = ac->protocol;
	*buf = o->o_authorizer_buf;
	*len = o->o_authorizer_buf_len;
	*reply_buf = o->o_authorizer_reply_buf;
	*reply_len = o->o_authorizer_reply_buf_len;
	return 0;
}


static int verify_authorizer_reply(struct ceph_connection *con, int len)
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;

	return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
}

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static int invalidate_authorizer(struct ceph_connection *con)
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;

	if (ac->ops->invalidate_authorizer)
		ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);

	return ceph_monc_validate_auth(&osdc->client->monc);
}
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static const struct ceph_connection_operations osd_con_ops = {
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	.get = get_osd_con,
	.put = put_osd_con,
	.dispatch = dispatch,
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	.get_authorizer = get_authorizer,
	.verify_authorizer_reply = verify_authorizer_reply,
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	.invalidate_authorizer = invalidate_authorizer,
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	.alloc_msg = alloc_msg,
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	.fault = osd_reset,
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};