osd_client.c 59.1 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);
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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);
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static void __send_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req);
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static int op_has_extent(int op)
{
	return (op == CEPH_OSD_OP_READ ||
		op == CEPH_OSD_OP_WRITE);
}

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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.
 */
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static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
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		       struct ceph_osd_req_op *op, u64 *bno)
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{
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	u64 orig_len = *plen;
	u64 objoff = 0;
	u64 objlen = 0;
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	int r;
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	/* object extent? */
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	r = ceph_calc_file_object_mapping(layout, off, orig_len, bno,
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					  &objoff, &objlen);
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	if (r < 0)
		return r;
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	if (objlen < orig_len) {
		*plen = objlen;
		dout(" skipping last %llu, final file extent %llu~%llu\n",
		     orig_len - *plen, off, *plen);
	}

	if (op_has_extent(op->op)) {
		u32 osize = le32_to_cpu(layout->fl_object_size);
		op->extent.offset = objoff;
		op->extent.length = objlen;
		if (op->extent.truncate_size <= off - objoff) {
			op->extent.truncate_size = 0;
		} else {
			op->extent.truncate_size -= off - objoff;
			if (op->extent.truncate_size > osize)
				op->extent.truncate_size = osize;
		}
	}
	if (op->op == CEPH_OSD_OP_WRITE)
		op->payload_len = *plen;

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	dout("calc_layout bno=%llx %llu~%llu\n", *bno, objoff, objlen);
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	return 0;
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}

/*
 * requests
 */
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void ceph_osdc_release_request(struct kref *kref)
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{
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	int num_pages;
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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);
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	if (req->r_con_filling_msg) {
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		dout("%s revoking msg %p from con %p\n", __func__,
		     req->r_reply, req->r_con_filling_msg);
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		ceph_msg_revoke_incoming(req->r_reply);
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		req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
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		req->r_con_filling_msg = NULL;
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	}
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	if (req->r_reply)
		ceph_msg_put(req->r_reply);
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	if (req->r_data_in.type == CEPH_OSD_DATA_TYPE_PAGES &&
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			req->r_data_in.own_pages) {
		num_pages = calc_pages_for((u64)req->r_data_in.alignment,
						(u64)req->r_data_in.length);
		ceph_release_page_vector(req->r_data_in.pages, num_pages);
	}
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	if (req->r_data_out.type == CEPH_OSD_DATA_TYPE_PAGES &&
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			req->r_data_out.own_pages) {
		num_pages = calc_pages_for((u64)req->r_data_out.alignment,
						(u64)req->r_data_out.length);
		ceph_release_page_vector(req->r_data_out.pages, num_pages);
	}
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	ceph_put_snap_context(req->r_snapc);
	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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struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
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					       struct ceph_snap_context *snapc,
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					       unsigned int num_ops,
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					       bool use_mempool,
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					       gfp_t gfp_flags)
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{
	struct ceph_osd_request *req;
	struct ceph_msg *msg;
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	size_t msg_size;

	msg_size = 4 + 4 + 8 + 8 + 4+8;
	msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
	msg_size += 1 + 8 + 4 + 4;     /* pg_t */
	msg_size += 4 + MAX_OBJ_NAME_SIZE;
	msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
	msg_size += 8;  /* snapid */
	msg_size += 8;  /* snap_seq */
	msg_size += 8 * (snapc ? snapc->num_snaps : 0);  /* snaps */
	msg_size += 4;
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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);
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	RB_CLEAR_NODE(&req->r_node);
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	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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	INIT_LIST_HEAD(&req->r_req_lru_item);
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	INIT_LIST_HEAD(&req->r_osd_item);

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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, true);
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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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	req->r_data_in.type = CEPH_OSD_DATA_TYPE_NONE;
	req->r_data_out.type = CEPH_OSD_DATA_TYPE_NONE;
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	/* create request message; allow space for oid */
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	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, true);
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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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	memset(msg->front.iov_base, 0, msg->front.iov_len);
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	req->r_request = msg;

	return req;
}
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EXPORT_SYMBOL(ceph_osdc_alloc_request);
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static u64 osd_req_encode_op(struct ceph_osd_request *req,
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			      struct ceph_osd_op *dst,
			      struct ceph_osd_req_op *src)
{
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	u64 out_data_len = 0;
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	struct ceph_pagelist *pagelist;
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	dst->op = cpu_to_le16(src->op);

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	switch (src->op) {
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	case CEPH_OSD_OP_STAT:
		break;
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	case CEPH_OSD_OP_READ:
	case CEPH_OSD_OP_WRITE:
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		if (src->op == CEPH_OSD_OP_WRITE)
			out_data_len = src->extent.length;
		dst->extent.offset = cpu_to_le64(src->extent.offset);
		dst->extent.length = cpu_to_le64(src->extent.length);
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		dst->extent.truncate_size =
			cpu_to_le64(src->extent.truncate_size);
		dst->extent.truncate_seq =
			cpu_to_le32(src->extent.truncate_seq);
		break;
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	case CEPH_OSD_OP_CALL:
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		pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
		BUG_ON(!pagelist);
		ceph_pagelist_init(pagelist);

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		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);
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		ceph_pagelist_append(pagelist, src->cls.class_name,
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				     src->cls.class_len);
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		ceph_pagelist_append(pagelist, src->cls.method_name,
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				     src->cls.method_len);
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		ceph_pagelist_append(pagelist, src->cls.indata,
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				     src->cls.indata_len);
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		req->r_data_out.type = CEPH_OSD_DATA_TYPE_PAGELIST;
		req->r_data_out.pagelist = pagelist;
		out_data_len = pagelist->length;
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		break;
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	case CEPH_OSD_OP_STARTSYNC:
		break;
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	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:
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		pr_err("unrecognized osd opcode %d\n", src->op);
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		WARN_ON(1);
		break;
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	case CEPH_OSD_OP_MAPEXT:
	case CEPH_OSD_OP_MASKTRUNC:
	case CEPH_OSD_OP_SPARSE_READ:
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	case CEPH_OSD_OP_NOTIFY:
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	case CEPH_OSD_OP_ASSERT_VER:
	case CEPH_OSD_OP_WRITEFULL:
	case CEPH_OSD_OP_TRUNCATE:
	case CEPH_OSD_OP_ZERO:
	case CEPH_OSD_OP_DELETE:
	case CEPH_OSD_OP_APPEND:
	case CEPH_OSD_OP_SETTRUNC:
	case CEPH_OSD_OP_TRIMTRUNC:
	case CEPH_OSD_OP_TMAPUP:
	case CEPH_OSD_OP_TMAPPUT:
	case CEPH_OSD_OP_TMAPGET:
	case CEPH_OSD_OP_CREATE:
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	case CEPH_OSD_OP_ROLLBACK:
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	case CEPH_OSD_OP_OMAPGETKEYS:
	case CEPH_OSD_OP_OMAPGETVALS:
	case CEPH_OSD_OP_OMAPGETHEADER:
	case CEPH_OSD_OP_OMAPGETVALSBYKEYS:
	case CEPH_OSD_OP_MODE_RD:
	case CEPH_OSD_OP_OMAPSETVALS:
	case CEPH_OSD_OP_OMAPSETHEADER:
	case CEPH_OSD_OP_OMAPCLEAR:
	case CEPH_OSD_OP_OMAPRMKEYS:
	case CEPH_OSD_OP_OMAP_CMP:
	case CEPH_OSD_OP_CLONERANGE:
	case CEPH_OSD_OP_ASSERT_SRC_VERSION:
	case CEPH_OSD_OP_SRC_CMPXATTR:
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	case CEPH_OSD_OP_GETXATTR:
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	case CEPH_OSD_OP_GETXATTRS:
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	case CEPH_OSD_OP_CMPXATTR:
	case CEPH_OSD_OP_SETXATTR:
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	case CEPH_OSD_OP_SETXATTRS:
	case CEPH_OSD_OP_RESETXATTRS:
	case CEPH_OSD_OP_RMXATTR:
	case CEPH_OSD_OP_PULL:
	case CEPH_OSD_OP_PUSH:
	case CEPH_OSD_OP_BALANCEREADS:
	case CEPH_OSD_OP_UNBALANCEREADS:
	case CEPH_OSD_OP_SCRUB:
	case CEPH_OSD_OP_SCRUB_RESERVE:
	case CEPH_OSD_OP_SCRUB_UNRESERVE:
	case CEPH_OSD_OP_SCRUB_STOP:
	case CEPH_OSD_OP_SCRUB_MAP:
	case CEPH_OSD_OP_WRLOCK:
	case CEPH_OSD_OP_WRUNLOCK:
	case CEPH_OSD_OP_RDLOCK:
	case CEPH_OSD_OP_RDUNLOCK:
	case CEPH_OSD_OP_UPLOCK:
	case CEPH_OSD_OP_DNLOCK:
	case CEPH_OSD_OP_PGLS:
	case CEPH_OSD_OP_PGLS_FILTER:
		pr_err("unsupported osd opcode %s\n",
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			ceph_osd_op_name(src->op));
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		WARN_ON(1);
		break;
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	}
	dst->payload_len = cpu_to_le32(src->payload_len);
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	return out_data_len;
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}

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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, unsigned int num_ops,
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			     struct ceph_osd_req_op *src_ops,
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			     struct ceph_snap_context *snapc, u64 snap_id,
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			     struct timespec *mtime)
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{
	struct ceph_msg *msg = req->r_request;
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	struct ceph_osd_req_op *src_op;
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	void *p;
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	size_t msg_size;
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	int flags = req->r_flags;
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	u64 data_len;
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	int i;
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	req->r_num_ops = num_ops;
	req->r_snapid = snap_id;
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	req->r_snapc = ceph_get_snap_context(snapc);

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	/* encode request */
	msg->hdr.version = cpu_to_le16(4);

	p = msg->front.iov_base;
	ceph_encode_32(&p, 1);   /* client_inc  is always 1 */
	req->r_request_osdmap_epoch = p;
	p += 4;
	req->r_request_flags = p;
	p += 4;
	if (req->r_flags & CEPH_OSD_FLAG_WRITE)
		ceph_encode_timespec(p, mtime);
	p += sizeof(struct ceph_timespec);
	req->r_request_reassert_version = p;
	p += sizeof(struct ceph_eversion); /* will get filled in */

	/* oloc */
	ceph_encode_8(&p, 4);
	ceph_encode_8(&p, 4);
	ceph_encode_32(&p, 8 + 4 + 4);
	req->r_request_pool = p;
	p += 8;
	ceph_encode_32(&p, -1);  /* preferred */
	ceph_encode_32(&p, 0);   /* key len */

	ceph_encode_8(&p, 1);
	req->r_request_pgid = p;
	p += 8 + 4;
	ceph_encode_32(&p, -1);  /* preferred */

	/* oid */
	ceph_encode_32(&p, req->r_oid_len);
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	memcpy(p, req->r_oid, req->r_oid_len);
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	dout("oid '%.*s' len %d\n", req->r_oid_len, req->r_oid, req->r_oid_len);
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	p += req->r_oid_len;
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	/* ops--can imply data */
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	ceph_encode_16(&p, num_ops);
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	src_op = src_ops;
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	req->r_request_ops = p;
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	data_len = 0;
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	for (i = 0; i < num_ops; i++, src_op++) {
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		data_len += osd_req_encode_op(req, p, src_op);
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		p += sizeof(struct ceph_osd_op);
	}
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	/* snaps */
	ceph_encode_64(&p, req->r_snapid);
	ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
	ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
	if (req->r_snapc) {
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		for (i = 0; i < snapc->num_snaps; i++) {
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			ceph_encode_64(&p, req->r_snapc->snaps[i]);
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		}
	}

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	req->r_request_attempts = p;
	p += 4;

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	/* data */
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	if (flags & CEPH_OSD_FLAG_WRITE) {
		u16 data_off;

		/*
		 * The header "data_off" is a hint to the receiver
		 * allowing it to align received data into its
		 * buffers such that there's no need to re-copy
		 * it before writing it to disk (direct I/O).
		 */
		data_off = (u16) (off & 0xffff);
		req->r_request->hdr.data_off = cpu_to_le16(data_off);
	}
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	req->r_request->hdr.data_len = cpu_to_le32(data_len);
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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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	dout("build_request msg_size was %d num_ops %d\n", (int)msg_size,
	     num_ops);
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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)
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{
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	struct ceph_osd_req_op ops[2];
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	struct ceph_osd_request *req;
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	unsigned int num_op = 1;
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	u64 bno = 0;
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	int r;
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	memset(&ops, 0, sizeof ops);

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

	if (do_sync) {
		ops[1].op = CEPH_OSD_OP_STARTSYNC;
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		num_op++;
	}
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	req = ceph_osdc_alloc_request(osdc, snapc, num_op, use_mempool,
					GFP_NOFS);
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	if (!req)
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		return ERR_PTR(-ENOMEM);
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	req->r_flags = flags;
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	/* calculate max write size */
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	r = calc_layout(layout, off, plen, ops, &bno);
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	if (r < 0) {
		ceph_osdc_put_request(req);
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		return ERR_PTR(r);
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	}
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	req->r_file_layout = *layout;  /* keep a copy */

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	snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno);
	req->r_oid_len = strlen(req->r_oid);

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	ceph_osdc_build_request(req, off, num_op, ops,
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				snapc, vino.snap, mtime);
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	return req;
}
509
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;
}

576 577 578 579 580 581
/*
 * Resubmit requests pending on the given osd.
 */
static void __kick_osd_requests(struct ceph_osd_client *osdc,
				struct ceph_osd *osd)
{
582
	struct ceph_osd_request *req, *nreq;
583
	LIST_HEAD(resend);
584 585 586 587
	int err;

	dout("__kick_osd_requests osd%d\n", osd->o_osd);
	err = __reset_osd(osdc, osd);
588
	if (err)
589
		return;
590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606
	/*
	 * Build up a list of requests to resend by traversing the
	 * osd's list of requests.  Requests for a given object are
	 * sent in tid order, and that is also the order they're
	 * kept on this list.  Therefore all requests that are in
	 * flight will be found first, followed by all requests that
	 * have not yet been sent.  And to resend requests while
	 * preserving this order we will want to put any sent
	 * requests back on the front of the osd client's unsent
	 * list.
	 *
	 * So we build a separate ordered list of already-sent
	 * requests for the affected osd and splice it onto the
	 * front of the osd client's unsent list.  Once we've seen a
	 * request that has not yet been sent we're done.  Those
	 * requests are already sitting right where they belong.
	 */
607
	list_for_each_entry(req, &osd->o_requests, r_osd_item) {
608 609 610 611
		if (!req->r_sent)
			break;
		list_move_tail(&req->r_req_lru_item, &resend);
		dout("requeueing %p tid %llu osd%d\n", req, req->r_tid,
612
		     osd->o_osd);
613 614 615
		if (!req->r_linger)
			req->r_flags |= CEPH_OSD_FLAG_RETRY;
	}
616
	list_splice(&resend, &osdc->req_unsent);
617

618 619 620 621 622
	/*
	 * Linger requests are re-registered before sending, which
	 * sets up a new tid for each.  We add them to the unsent
	 * list at the end to keep things in tid order.
	 */
623 624
	list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
				 r_linger_osd) {
625 626 627 628 629
		/*
		 * reregister request prior to unregistering linger so
		 * that r_osd is preserved.
		 */
		BUG_ON(!list_empty(&req->r_req_lru_item));
630
		__register_request(osdc, req);
631
		list_add_tail(&req->r_req_lru_item, &osdc->req_unsent);
632
		list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
633
		__unregister_linger_request(osdc, req);
634 635
		dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
		     osd->o_osd);
636 637 638
	}
}

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/*
640
 * 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);
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	mutex_lock(&osdc->request_mutex);
	__kick_osd_requests(osdc, osd);
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	__send_queued(osdc);
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	mutex_unlock(&osdc->request_mutex);
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	up_read(&osdc->map_sem);
}

/*
 * Track open sessions with osds.
 */
662
static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
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{
	struct ceph_osd *osd;

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

	atomic_set(&osd->o_ref, 1);
	osd->o_osdc = osdc;
672
	osd->o_osd = onum;
673
	RB_CLEAR_NODE(&osd->o_node);
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	INIT_LIST_HEAD(&osd->o_requests);
675
	INIT_LIST_HEAD(&osd->o_linger_requests);
676
	INIT_LIST_HEAD(&osd->o_osd_lru);
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	osd->o_incarnation = 1;

679
	ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
680

681
	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);
701
	if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
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		struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;

704
		ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
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		kfree(osd);
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	}
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}

/*
 * remove an osd from our map
 */
712
static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
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{
714
	dout("__remove_osd %p\n", osd);
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	BUG_ON(!list_empty(&osd->o_requests));
	rb_erase(&osd->o_node, &osdc->osds);
717
	list_del_init(&osd->o_osd_lru);
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	ceph_con_close(&osd->o_con);
	put_osd(osd);
}

722 723
static void remove_all_osds(struct ceph_osd_client *osdc)
{
724
	dout("%s %p\n", __func__, osdc);
725 726 727 728 729 730 731 732 733
	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);
}

734 735 736 737 738 739
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);
740
	osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
741 742 743 744 745 746 747 748 749
}

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);
}

750
static void remove_old_osds(struct ceph_osd_client *osdc)
751 752 753 754 755 756
{
	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) {
757
		if (time_before(jiffies, osd->lru_ttl))
758 759 760 761 762 763
			break;
		__remove_osd(osdc, osd);
	}
	mutex_unlock(&osdc->request_mutex);
}

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/*
 * reset osd connect
 */
767
static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
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{
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	struct ceph_entity_addr *peer_addr;
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771
	dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
772 773
	if (list_empty(&osd->o_requests) &&
	    list_empty(&osd->o_linger_requests)) {
774
		__remove_osd(osdc, osd);
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		return -ENODEV;
	}

	peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
	if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
			!ceph_con_opened(&osd->o_con)) {
		struct ceph_osd_request *req;

784 785 786 787 788
		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;
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		return -EAGAIN;
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	}
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	ceph_con_close(&osd->o_con);
	ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
	osd->o_incarnation++;

	return 0;
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}

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;

806
	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;
}

839 840 841
static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
{
	schedule_delayed_work(&osdc->timeout_work,
842
			osdc->client->options->osd_keepalive_timeout * HZ);
843 844 845 846 847 848
}

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.
 */
854 855
static void __register_request(struct ceph_osd_client *osdc,
			       struct ceph_osd_request *req)
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{
	req->r_tid = ++osdc->last_tid;
858
	req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
859
	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) {
864 865
		dout(" first request, scheduling timeout\n");
		__schedule_osd_timeout(osdc);
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	}
867 868
}

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/*
 * called under osdc->request_mutex
 */
static void __unregister_request(struct ceph_osd_client *osdc,
				 struct ceph_osd_request *req)
{
875 876 877 878 879 880
	if (RB_EMPTY_NODE(&req->r_node)) {
		dout("__unregister_request %p tid %lld not registered\n",
			req, req->r_tid);
		return;
	}

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	dout("__unregister_request %p tid %lld\n", req, req->r_tid);
	rb_erase(&req->r_node, &osdc->requests);
	osdc->num_requests--;

885 886
	if (req->r_osd) {
		/* make sure the original request isn't in flight. */
887
		ceph_msg_revoke(req->r_request);
888 889

		list_del_init(&req->r_osd_item);
890 891 892
		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);
893
			__move_osd_to_lru(osdc, req->r_osd);
894
		}
895
		if (list_empty(&req->r_linger_item))
896
			req->r_osd = NULL;
897
	}
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	list_del_init(&req->r_req_lru_item);
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	ceph_osdc_put_request(req);

902 903 904
	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)
{
913
	if (req->r_sent && req->r_osd) {
914
		ceph_msg_revoke(req->r_request);
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		req->r_sent = 0;
	}
}

919 920 921 922 923
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);
924 925 926
	if (req->r_osd)
		list_add_tail(&req->r_linger_osd,
			      &req->r_osd->o_linger_requests);
927 928 929 930 931 932
}

static void __unregister_linger_request(struct ceph_osd_client *osdc,
					struct ceph_osd_request *req)
{
	dout("__unregister_linger_request %p\n", req);
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	list_del_init(&req->r_linger_item);
934 935 936 937 938 939 940 941
	if (req->r_osd) {
		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);
		}
942 943
		if (list_empty(&req->r_osd_item))
			req->r_osd = NULL;
944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973
	}
}

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
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 * no up osd, set r_osd to NULL.  Move the request to the appropriate list
978
 * (unsent, homeless) or leave on in-flight lru.
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 *
 * Return 0 if unchanged, 1 if changed, or negative on error.
 *
 * Caller should hold map_sem for read and request_mutex.
 */
984
static int __map_request(struct ceph_osd_client *osdc,
985
			 struct ceph_osd_request *req, int force_resend)
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{
987
	struct ceph_pg pgid;
988 989
	int acting[CEPH_PG_MAX_SIZE];
	int o = -1, num = 0;
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	int err;

992
	dout("map_request %p tid %lld\n", req, req->r_tid);
993 994
	err = ceph_calc_ceph_pg(&pgid, req->r_oid, osdc->osdmap,
				ceph_file_layout_pg_pool(req->r_file_layout));
995 996
	if (err) {
		list_move(&req->r_req_lru_item, &osdc->req_notarget);
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		return err;
998
	}
999 1000
	req->r_pgid = pgid;

1001 1002 1003 1004 1005
	err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
	if (err > 0) {
		o = acting[0];
		num = err;
	}
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1007 1008
	if ((!force_resend &&
	     req->r_osd && req->r_osd->o_osd == o &&
1009 1010 1011
	     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 */

1015 1016
	dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
	     req->r_tid, pgid.pool, pgid.seed, o,
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	     req->r_osd ? req->r_osd->o_osd : -1);

1019 1020 1021 1022
	/* 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) {
1031
		err = -ENOMEM;
1032
		req->r_osd = create_osd(osdc, o);
1033 1034
		if (!req->r_osd) {
			list_move(&req->r_req_lru_item, &osdc->req_notarget);
1035
			goto out;
1036
		}
S
Sage Weil 已提交
1037

1038
		dout("map_request osd %p is osd%d\n", req->r_osd, o);
S
Sage Weil 已提交
1039 1040
		__insert_osd(osdc, req->r_osd);

1041 1042 1043
		ceph_con_open(&req->r_osd->o_con,
			      CEPH_ENTITY_TYPE_OSD, o,
			      &osdc->osdmap->osd_addr[o]);
S
Sage Weil 已提交
1044 1045
	}

1046 1047
	if (req->r_osd) {
		__remove_osd_from_lru(req->r_osd);
1048 1049
		list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
		list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1050
	} else {
1051
		list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1052
	}
1053
	err = 1;   /* osd or pg changed */
S
Sage Weil 已提交
1054 1055 1056 1057 1058 1059 1060 1061

out:
	return err;
}

/*
 * caller should hold map_sem (for read) and request_mutex
 */
1062 1063
static void __send_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req)
S
Sage Weil 已提交
1064
{
1065
	void *p;
S
Sage Weil 已提交
1066

1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
	dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
	     req, req->r_tid, req->r_osd->o_osd, req->r_flags,
	     (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);

	/* fill in message content that changes each time we send it */
	put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
	put_unaligned_le32(req->r_flags, req->r_request_flags);
	put_unaligned_le64(req->r_pgid.pool, req->r_request_pool);
	p = req->r_request_pgid;
	ceph_encode_64(&p, req->r_pgid.pool);
	ceph_encode_32(&p, req->r_pgid.seed);
	put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
	memcpy(req->r_request_reassert_version, &req->r_reassert_version,
	       sizeof(req->r_reassert_version));
1081

S
Sage Weil 已提交
1082
	req->r_stamp = jiffies;
1083
	list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
S
Sage Weil 已提交
1084 1085 1086 1087 1088 1089

	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;
}

1090 1091 1092
/*
 * Send any requests in the queue (req_unsent).
 */
A
Alex Elder 已提交
1093
static void __send_queued(struct ceph_osd_client *osdc)
1094 1095 1096
{
	struct ceph_osd_request *req, *tmp;

A
Alex Elder 已提交
1097 1098
	dout("__send_queued\n");
	list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1099 1100 1101
		__send_request(osdc, req);
}

S
Sage Weil 已提交
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
/*
 * 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);
S
Sage Weil 已提交
1115
	struct ceph_osd_request *req;
S
Sage Weil 已提交
1116
	struct ceph_osd *osd;
1117
	unsigned long keepalive =
1118
		osdc->client->options->osd_keepalive_timeout * HZ;
1119
	struct list_head slow_osds;
S
Sage Weil 已提交
1120 1121 1122 1123 1124 1125 1126
	dout("timeout\n");
	down_read(&osdc->map_sem);

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

	mutex_lock(&osdc->request_mutex);

1127 1128 1129 1130 1131 1132 1133
	/*
	 * 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
Sage Weil 已提交
1134
		if (time_before(jiffies, req->r_stamp + keepalive))
1135 1136 1137 1138 1139
			break;

		osd = req->r_osd;
		BUG_ON(!osd);
		dout(" tid %llu is slow, will send keepalive on osd%d\n",
S
Sage Weil 已提交
1140
		     req->r_tid, osd->o_osd);
1141 1142 1143 1144 1145 1146
		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
Sage Weil 已提交
1147 1148 1149
		ceph_con_keepalive(&osd->o_con);
	}

1150
	__schedule_osd_timeout(osdc);
A
Alex Elder 已提交
1151
	__send_queued(osdc);
S
Sage Weil 已提交
1152 1153 1154 1155
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
}

1156 1157 1158 1159 1160 1161
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 =
1162
		osdc->client->options->osd_idle_ttl * HZ >> 2;
1163 1164 1165

	dout("osds timeout\n");
	down_read(&osdc->map_sem);
1166
	remove_old_osds(osdc);
1167 1168 1169 1170 1171 1172
	up_read(&osdc->map_sem);

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

S
Sage Weil 已提交
1173 1174 1175 1176 1177 1178 1179
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 */
}

1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
static int __decode_pgid(void **p, void *end, struct ceph_pg *pgid)
{
	__u8 v;

	ceph_decode_need(p, end, 1 + 8 + 4 + 4, bad);
	v = ceph_decode_8(p);
	if (v > 1) {
		pr_warning("do not understand pg encoding %d > 1", v);
		return -EINVAL;
	}
	pgid->pool = ceph_decode_64(p);
	pgid->seed = ceph_decode_32(p);
	*p += 4;
	return 0;

bad:
	pr_warning("incomplete pg encoding");
	return -EINVAL;
}

S
Sage Weil 已提交
1200 1201 1202 1203
/*
 * handle osd op reply.  either call the callback if it is specified,
 * or do the completion to wake up the waiting thread.
 */
1204 1205
static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
			 struct ceph_connection *con)
S
Sage Weil 已提交
1206
{
1207
	void *p, *end;
S
Sage Weil 已提交
1208 1209
	struct ceph_osd_request *req;
	u64 tid;
1210 1211
	int object_len;
	int numops, payload_len, flags;
1212
	s32 result;
1213 1214 1215 1216 1217 1218
	s32 retry_attempt;
	struct ceph_pg pg;
	int err;
	u32 reassert_epoch;
	u64 reassert_version;
	u32 osdmap_epoch;
1219
	int already_completed;
1220
	int i;
S
Sage Weil 已提交
1221

1222
	tid = le64_to_cpu(msg->hdr.tid);
1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
	dout("handle_reply %p tid %llu\n", msg, tid);

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

	ceph_decode_need(&p, end, 4, bad);
	object_len = ceph_decode_32(&p);
	ceph_decode_need(&p, end, object_len, bad);
	p += object_len;

	err = __decode_pgid(&p, end, &pg);
	if (err)
S
Sage Weil 已提交
1235
		goto bad;
1236 1237 1238 1239 1240 1241 1242 1243

	ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
	flags = ceph_decode_64(&p);
	result = ceph_decode_32(&p);
	reassert_epoch = ceph_decode_32(&p);
	reassert_version = ceph_decode_64(&p);
	osdmap_epoch = ceph_decode_32(&p);

S
Sage Weil 已提交
1244 1245 1246 1247 1248 1249 1250 1251 1252
	/* 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);
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284

	dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
	     req, result);

	ceph_decode_need(&p, end, 4, bad);
	numops = ceph_decode_32(&p);
	if (numops > CEPH_OSD_MAX_OP)
		goto bad_put;
	if (numops != req->r_num_ops)
		goto bad_put;
	payload_len = 0;
	ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad);
	for (i = 0; i < numops; i++) {
		struct ceph_osd_op *op = p;
		int len;

		len = le32_to_cpu(op->payload_len);
		req->r_reply_op_len[i] = len;
		dout(" op %d has %d bytes\n", i, len);
		payload_len += len;
		p += sizeof(*op);
	}
	if (payload_len != le32_to_cpu(msg->hdr.data_len)) {
		pr_warning("sum of op payload lens %d != data_len %d",
			   payload_len, le32_to_cpu(msg->hdr.data_len));
		goto bad_put;
	}

	ceph_decode_need(&p, end, 4 + numops * 4, bad);
	retry_attempt = ceph_decode_32(&p);
	for (i = 0; i < numops; i++)
		req->r_reply_op_result[i] = ceph_decode_32(&p);
S
Sage Weil 已提交
1285

1286
	/*
1287
	 * if this connection filled our message, drop our reference now, to
1288 1289
	 * avoid a (safe but slower) revoke later.
	 */
1290
	if (req->r_con_filling_msg == con && req->r_reply == msg) {
S
Sage Weil 已提交
1291
		dout(" dropping con_filling_msg ref %p\n", con);
1292
		req->r_con_filling_msg = NULL;
1293
		con->ops->put(con);
1294 1295
	}

S
Sage Weil 已提交
1296
	if (!req->r_got_reply) {
1297
		unsigned int bytes;
S
Sage Weil 已提交
1298

1299
		req->r_result = result;
S
Sage Weil 已提交
1300 1301 1302 1303 1304 1305 1306
		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, */
1307 1308
		req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
		req->r_reassert_version.version = cpu_to_le64(reassert_version);
S
Sage Weil 已提交
1309 1310 1311 1312

		req->r_got_reply = 1;
	} else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
		dout("handle_reply tid %llu dup ack\n", tid);
S
Sage Weil 已提交
1313
		mutex_unlock(&osdc->request_mutex);
S
Sage Weil 已提交
1314 1315 1316 1317 1318
		goto done;
	}

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

1319 1320 1321
	if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
		__register_linger_request(osdc, req);

S
Sage Weil 已提交
1322
	/* either this is a read, or we got the safe response */
1323 1324
	if (result < 0 ||
	    (flags & CEPH_OSD_FLAG_ONDISK) ||
S
Sage Weil 已提交
1325 1326 1327
	    ((flags & CEPH_OSD_FLAG_WRITE) == 0))
		__unregister_request(osdc, req);

1328 1329
	already_completed = req->r_completed;
	req->r_completed = 1;
S
Sage Weil 已提交
1330
	mutex_unlock(&osdc->request_mutex);
1331 1332
	if (already_completed)
		goto done;
S
Sage Weil 已提交
1333 1334 1335 1336

	if (req->r_callback)
		req->r_callback(req, msg);
	else
1337
		complete_all(&req->r_completion);
S
Sage Weil 已提交
1338

S
Sage Weil 已提交
1339 1340
	if (flags & CEPH_OSD_FLAG_ONDISK)
		complete_request(req);
S
Sage Weil 已提交
1341 1342

done:
1343
	dout("req=%p req->r_linger=%d\n", req, req->r_linger);
S
Sage Weil 已提交
1344 1345 1346
	ceph_osdc_put_request(req);
	return;

1347 1348
bad_put:
	ceph_osdc_put_request(req);
S
Sage Weil 已提交
1349
bad:
1350 1351
	pr_err("corrupt osd_op_reply got %d %d\n",
	       (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1352
	ceph_msg_dump(msg);
S
Sage Weil 已提交
1353 1354
}

1355
static void reset_changed_osds(struct ceph_osd_client *osdc)
S
Sage Weil 已提交
1356 1357 1358
{
	struct rb_node *p, *n;

1359 1360
	for (p = rb_first(&osdc->osds); p; p = n) {
		struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
S
Sage Weil 已提交
1361

1362 1363 1364 1365 1366 1367 1368
		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
Sage Weil 已提交
1369
	}
1370 1371 1372
}

/*
1373 1374
 * Requeue requests whose mapping to an OSD has changed.  If requests map to
 * no osd, request a new map.
1375
 *
1376
 * Caller should hold map_sem for read.
1377
 */
1378
static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1379
{
1380
	struct ceph_osd_request *req, *nreq;
1381 1382 1383
	struct rb_node *p;
	int needmap = 0;
	int err;
1384

1385
	dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1386
	mutex_lock(&osdc->request_mutex);
1387
	for (p = rb_first(&osdc->requests); p; ) {
1388
		req = rb_entry(p, struct ceph_osd_request, r_node);
1389
		p = rb_next(p);
1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407

		/*
		 * For linger requests that have not yet been
		 * registered, move them to the linger list; they'll
		 * be sent to the osd in the loop below.  Unregister
		 * the request before re-registering it as a linger
		 * request to ensure the __map_request() below
		 * will decide it needs to be sent.
		 */
		if (req->r_linger && list_empty(&req->r_linger_item)) {
			dout("%p tid %llu restart on osd%d\n",
			     req, req->r_tid,
			     req->r_osd ? req->r_osd->o_osd : -1);
			__unregister_request(osdc, req);
			__register_linger_request(osdc, req);
			continue;
		}

1408
		err = __map_request(osdc, req, force_resend);
1409 1410 1411 1412 1413 1414
		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) {
1415 1416 1417 1418
			if (!req->r_linger) {
				dout("%p tid %llu requeued on osd%d\n", req,
				     req->r_tid,
				     req->r_osd ? req->r_osd->o_osd : -1);
1419
				req->r_flags |= CEPH_OSD_FLAG_RETRY;
1420 1421
			}
		}
1422 1423 1424 1425 1426 1427
	}

	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);

1428
		err = __map_request(osdc, req, force_resend);
1429
		dout("__map_request returned %d\n", err);
1430 1431 1432 1433 1434 1435 1436 1437
		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;
1438
		}
1439 1440 1441 1442

		dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
		     req->r_osd ? req->r_osd->o_osd : -1);
		__register_request(osdc, req);
1443
		__unregister_linger_request(osdc, req);
1444
	}
S
Sage Weil 已提交
1445 1446 1447 1448 1449 1450
	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);
	}
1451
	reset_changed_osds(osdc);
1452
}
1453 1454


S
Sage Weil 已提交
1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477
/*
 * 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));
1478 1479
	if (ceph_check_fsid(osdc->client, &fsid) < 0)
		return;
S
Sage Weil 已提交
1480 1481 1482 1483 1484 1485 1486 1487

	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);
1488 1489
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
Sage Weil 已提交
1490 1491 1492 1493 1494 1495 1496
		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,
1497
							  &osdc->client->msgr);
S
Sage Weil 已提交
1498 1499 1500 1501
			if (IS_ERR(newmap)) {
				err = PTR_ERR(newmap);
				goto bad;
			}
1502
			BUG_ON(!newmap);
S
Sage Weil 已提交
1503 1504 1505 1506
			if (newmap != osdc->osdmap) {
				ceph_osdmap_destroy(osdc->osdmap);
				osdc->osdmap = newmap;
			}
1507
			kick_requests(osdc, 0);
S
Sage Weil 已提交
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522
		} 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);
1523 1524
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1525 1526 1527 1528 1529 1530 1531 1532 1533
		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 {
1534 1535
			int skipped_map = 0;

S
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1536 1537 1538 1539 1540 1541
			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;
			}
1542
			BUG_ON(!newmap);
S
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1543 1544
			oldmap = osdc->osdmap;
			osdc->osdmap = newmap;
1545 1546 1547
			if (oldmap) {
				if (oldmap->epoch + 1 < newmap->epoch)
					skipped_map = 1;
S
Sage Weil 已提交
1548
				ceph_osdmap_destroy(oldmap);
1549 1550
			}
			kick_requests(osdc, skipped_map);
S
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1551 1552 1553 1554 1555 1556 1557 1558
		}
		p += maplen;
		nr_maps--;
	}

done:
	downgrade_write(&osdc->map_sem);
	ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1559 1560 1561 1562 1563 1564 1565 1566 1567

	/*
	 * 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);

A
Alex Elder 已提交
1568 1569 1570
	mutex_lock(&osdc->request_mutex);
	__send_queued(osdc);
	mutex_unlock(&osdc->request_mutex);
S
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1571
	up_read(&osdc->map_sem);
1572
	wake_up_all(&osdc->client->auth_wq);
S
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1573 1574 1575 1576
	return;

bad:
	pr_err("osdc handle_map corrupt msg\n");
1577
	ceph_msg_dump(msg);
S
Sage Weil 已提交
1578 1579 1580 1581
	up_write(&osdc->map_sem);
	return;
}

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 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663
/*
 * 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 *),
1664
			   void *data, struct ceph_osd_event **pevent)
1665 1666 1667 1668 1669 1670 1671 1672 1673
{
	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;
1674
	event->one_shot = 0;
1675 1676 1677
	event->data = data;
	event->osdc = osdc;
	INIT_LIST_HEAD(&event->osd_node);
1678
	RB_CLEAR_NODE(&event->node);
1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724
	kref_init(&event->kref);   /* one ref for us */
	kref_get(&event->kref);    /* one ref for the caller */

	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);
	dout("do_event_work completed %p\n", event);
	ceph_osdc_put_event(event);
	kfree(event_work);
}


/*
 * Process osd watch notifications
 */
1725 1726
static void handle_watch_notify(struct ceph_osd_client *osdc,
				struct ceph_msg *msg)
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746
{
	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) {
1747
		BUG_ON(event->one_shot);
1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758
		get_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;
		}
1759
		INIT_WORK(&event_work->work, do_event_work);
1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780
		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:
	ceph_osdc_put_event(event);
	return;

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

1781 1782
static void ceph_osdc_msg_data_set(struct ceph_msg *msg,
				struct ceph_osd_data *osd_data)
S
Sage Weil 已提交
1783
{
1784
	if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
1785
		BUG_ON(osd_data->length > (u64) SIZE_MAX);
1786
		if (osd_data->length)
1787 1788
			ceph_msg_data_set_pages(msg, osd_data->pages,
				osd_data->length, osd_data->alignment);
1789 1790 1791
	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
		BUG_ON(!osd_data->pagelist->length);
		ceph_msg_data_set_pagelist(msg, osd_data->pagelist);
1792
#ifdef CONFIG_BLOCK
1793
	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
1794
		ceph_msg_data_set_bio(msg, osd_data->bio);
1795
#endif
1796
	} else {
1797
		BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
1798
	}
1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813
}

/*
 * Register request, send initial attempt.
 */
int ceph_osdc_start_request(struct ceph_osd_client *osdc,
			    struct ceph_osd_request *req,
			    bool nofail)
{
	int rc = 0;

	/* Set up response incoming data and request outgoing data fields */

	ceph_osdc_msg_data_set(req->r_reply, &req->r_data_in);
	ceph_osdc_msg_data_set(req->r_request, &req->r_data_out);
S
Sage Weil 已提交
1814 1815 1816

	down_read(&osdc->map_sem);
	mutex_lock(&osdc->request_mutex);
1817
	__register_request(osdc, req);
1818 1819 1820 1821 1822 1823 1824
	WARN_ON(req->r_sent);
	rc = __map_request(osdc, req, 0);
	if (rc < 0) {
		if (nofail) {
			dout("osdc_start_request failed map, "
				" will retry %lld\n", req->r_tid);
			rc = 0;
S
Sage Weil 已提交
1825
		}
1826
		goto out_unlock;
S
Sage Weil 已提交
1827
	}
1828 1829 1830 1831
	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 {
1832
		__send_queued(osdc);
1833 1834
	}
	rc = 0;
1835
out_unlock:
S
Sage Weil 已提交
1836 1837 1838 1839
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
	return rc;
}
1840
EXPORT_SYMBOL(ceph_osdc_start_request);
S
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1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853

/*
 * 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);
1854
		__unregister_request(osdc, req);
S
Sage Weil 已提交
1855
		mutex_unlock(&osdc->request_mutex);
S
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1856
		complete_request(req);
1857
		dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
S
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1858 1859 1860 1861 1862 1863
		return rc;
	}

	dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
	return req->r_result;
}
1864
EXPORT_SYMBOL(ceph_osdc_wait_request);
S
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1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897

/*
 * 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);
}
1898
EXPORT_SYMBOL(ceph_osdc_sync);
S
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1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915

/*
 * 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;
1916
	INIT_LIST_HEAD(&osdc->osd_lru);
S
Sage Weil 已提交
1917
	osdc->requests = RB_ROOT;
1918
	INIT_LIST_HEAD(&osdc->req_lru);
1919 1920
	INIT_LIST_HEAD(&osdc->req_unsent);
	INIT_LIST_HEAD(&osdc->req_notarget);
1921
	INIT_LIST_HEAD(&osdc->req_linger);
S
Sage Weil 已提交
1922 1923
	osdc->num_requests = 0;
	INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1924
	INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1925 1926 1927
	spin_lock_init(&osdc->event_lock);
	osdc->event_tree = RB_ROOT;
	osdc->event_count = 0;
1928 1929

	schedule_delayed_work(&osdc->osds_timeout_work,
1930
	   round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
S
Sage Weil 已提交
1931

1932
	err = -ENOMEM;
S
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1933 1934 1935
	osdc->req_mempool = mempool_create_kmalloc_pool(10,
					sizeof(struct ceph_osd_request));
	if (!osdc->req_mempool)
1936
		goto out;
S
Sage Weil 已提交
1937

1938 1939
	err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
				OSD_OP_FRONT_LEN, 10, true,
1940
				"osd_op");
S
Sage Weil 已提交
1941
	if (err < 0)
1942
		goto out_mempool;
1943
	err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
1944 1945
				OSD_OPREPLY_FRONT_LEN, 10, true,
				"osd_op_reply");
S
Sage Weil 已提交
1946 1947
	if (err < 0)
		goto out_msgpool;
1948 1949 1950 1951 1952 1953 1954

	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
Sage Weil 已提交
1955
	return 0;
1956

S
Sage Weil 已提交
1957 1958
out_msgpool:
	ceph_msgpool_destroy(&osdc->msgpool_op);
1959 1960 1961 1962
out_mempool:
	mempool_destroy(osdc->req_mempool);
out:
	return err;
S
Sage Weil 已提交
1963 1964 1965 1966
}

void ceph_osdc_stop(struct ceph_osd_client *osdc)
{
1967 1968
	flush_workqueue(osdc->notify_wq);
	destroy_workqueue(osdc->notify_wq);
S
Sage Weil 已提交
1969
	cancel_delayed_work_sync(&osdc->timeout_work);
1970
	cancel_delayed_work_sync(&osdc->osds_timeout_work);
S
Sage Weil 已提交
1971 1972 1973 1974
	if (osdc->osdmap) {
		ceph_osdmap_destroy(osdc->osdmap);
		osdc->osdmap = NULL;
	}
1975
	remove_all_osds(osdc);
S
Sage Weil 已提交
1976 1977
	mempool_destroy(osdc->req_mempool);
	ceph_msgpool_destroy(&osdc->msgpool_op);
S
Sage Weil 已提交
1978
	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
S
Sage Weil 已提交
1979 1980 1981 1982 1983 1984 1985 1986 1987 1988
}

/*
 * 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,
1989
			struct page **pages, int num_pages, int page_align)
S
Sage Weil 已提交
1990 1991
{
	struct ceph_osd_request *req;
1992
	struct ceph_osd_data *osd_data;
S
Sage Weil 已提交
1993 1994 1995 1996 1997 1998 1999
	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,
2000
				    false);
2001 2002
	if (IS_ERR(req))
		return PTR_ERR(req);
S
Sage Weil 已提交
2003 2004

	/* it may be a short read due to an object boundary */
2005 2006 2007 2008

	osd_data = &req->r_data_in;
	osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
	osd_data->pages = pages;
2009
	osd_data->length = *plen;
2010
	osd_data->alignment = page_align;
S
Sage Weil 已提交
2011

2012 2013
	dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
	     off, *plen, osd_data->length, page_align);
S
Sage Weil 已提交
2014 2015 2016 2017 2018 2019 2020 2021 2022

	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;
}
2023
EXPORT_SYMBOL(ceph_osdc_readpages);
S
Sage Weil 已提交
2024 2025 2026 2027 2028 2029 2030 2031 2032 2033

/*
 * 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,
2034
			 struct page **pages, int num_pages)
S
Sage Weil 已提交
2035 2036
{
	struct ceph_osd_request *req;
2037
	struct ceph_osd_data *osd_data;
S
Sage Weil 已提交
2038
	int rc = 0;
2039
	int page_align = off & ~PAGE_MASK;
S
Sage Weil 已提交
2040 2041 2042 2043

	BUG_ON(vino.snap != CEPH_NOSNAP);
	req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
				    CEPH_OSD_OP_WRITE,
2044
				    CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2045
				    snapc, 0,
S
Sage Weil 已提交
2046
				    truncate_seq, truncate_size, mtime,
2047
				    true);
2048 2049
	if (IS_ERR(req))
		return PTR_ERR(req);
S
Sage Weil 已提交
2050 2051

	/* it may be a short write due to an object boundary */
2052 2053 2054
	osd_data = &req->r_data_out;
	osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
	osd_data->pages = pages;
2055
	osd_data->length = len;
2056
	osd_data->alignment = page_align;
2057
	dout("writepages %llu~%llu (%llu bytes)\n", off, len, osd_data->length);
S
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2058

2059
	rc = ceph_osdc_start_request(osdc, req, true);
S
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2060 2061 2062 2063 2064 2065 2066 2067 2068
	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;
}
2069
EXPORT_SYMBOL(ceph_osdc_writepages);
S
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2070 2071 2072 2073 2074 2075 2076

/*
 * handle incoming message
 */
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
{
	struct ceph_osd *osd = con->private;
2077
	struct ceph_osd_client *osdc;
S
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2078 2079 2080
	int type = le16_to_cpu(msg->hdr.type);

	if (!osd)
S
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2081
		goto out;
2082
	osdc = osd->o_osdc;
S
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2083 2084 2085 2086 2087 2088

	switch (type) {
	case CEPH_MSG_OSD_MAP:
		ceph_osdc_handle_map(osdc, msg);
		break;
	case CEPH_MSG_OSD_OPREPLY:
2089
		handle_reply(osdc, msg, con);
S
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2090
		break;
2091 2092 2093
	case CEPH_MSG_WATCH_NOTIFY:
		handle_watch_notify(osdc, msg);
		break;
S
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2094 2095 2096 2097 2098

	default:
		pr_err("received unknown message type %d %s\n", type,
		       ceph_msg_type_name(type));
	}
S
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2099
out:
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2100 2101 2102
	ceph_msg_put(msg);
}

2103
/*
2104 2105
 * lookup and return message for incoming reply.  set up reply message
 * pages.
2106 2107
 */
static struct ceph_msg *get_reply(struct ceph_connection *con,
2108 2109
				  struct ceph_msg_header *hdr,
				  int *skip)
S
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2110 2111 2112
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc = osd->o_osdc;
2113
	struct ceph_msg *m;
2114
	struct ceph_osd_request *req;
2115 2116
	int front = le32_to_cpu(hdr->front_len);
	int data_len = le32_to_cpu(hdr->data_len);
2117
	u64 tid;
S
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2118

2119 2120 2121 2122 2123 2124
	tid = le64_to_cpu(hdr->tid);
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (!req) {
		*skip = 1;
		m = NULL;
2125 2126
		dout("get_reply unknown tid %llu from osd%d\n", tid,
		     osd->o_osd);
2127 2128
		goto out;
	}
S
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2129 2130

	if (req->r_con_filling_msg) {
2131
		dout("%s revoking msg %p from old con %p\n", __func__,
S
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2132
		     req->r_reply, req->r_con_filling_msg);
2133
		ceph_msg_revoke_incoming(req->r_reply);
2134
		req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
2135
		req->r_con_filling_msg = NULL;
2136 2137
	}

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2138 2139 2140
	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);
2141
		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2142
		if (!m)
S
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2143 2144 2145 2146 2147 2148
			goto out;
		ceph_msg_put(req->r_reply);
		req->r_reply = m;
	}
	m = ceph_msg_get(req->r_reply);

2149
	if (data_len > 0) {
2150 2151 2152 2153
		struct ceph_osd_data *osd_data = &req->r_data_in;

		if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
			if (osd_data->pages &&
2154
				unlikely(osd_data->length < data_len)) {
2155

2156 2157 2158
				pr_warning("tid %lld reply has %d bytes "
					"we had only %llu bytes ready\n",
					tid, data_len, osd_data->length);
2159 2160 2161 2162 2163 2164
				*skip = 1;
				ceph_msg_put(m);
				m = NULL;
				goto out;
			}
		}
2165
	}
2166
	*skip = 0;
2167
	req->r_con_filling_msg = con->ops->get(con);
S
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2168
	dout("get_reply tid %lld %p\n", tid, m);
2169 2170 2171

out:
	mutex_unlock(&osdc->request_mutex);
2172
	return m;
2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183

}

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);

A
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2184
	*skip = 0;
2185 2186
	switch (type) {
	case CEPH_MSG_OSD_MAP:
2187
	case CEPH_MSG_WATCH_NOTIFY:
2188
		return ceph_msg_new(type, front, GFP_NOFS, false);
2189 2190 2191 2192 2193 2194 2195 2196
	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;
	}
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2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215
}

/*
 * 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);
}

2216 2217 2218
/*
 * authentication
 */
2219 2220 2221 2222 2223
/*
 * Note: returned pointer is the address of a structure that's
 * managed separately.  Caller must *not* attempt to free it.
 */
static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2224
					int *proto, int force_new)
2225 2226 2227 2228
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;
2229
	struct ceph_auth_handshake *auth = &o->o_auth;
2230

2231
	if (force_new && auth->authorizer) {
2232
		ceph_auth_destroy_authorizer(ac, auth->authorizer);
2233 2234
		auth->authorizer = NULL;
	}
2235 2236 2237
	if (!auth->authorizer) {
		int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
						      auth);
2238
		if (ret)
2239
			return ERR_PTR(ret);
2240 2241
	} else {
		int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2242 2243 2244
						     auth);
		if (ret)
			return ERR_PTR(ret);
2245 2246
	}
	*proto = ac->protocol;
2247

2248
	return auth;
2249 2250 2251 2252 2253 2254 2255 2256 2257
}


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;

2258
	return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2259 2260
}

2261 2262 2263 2264 2265 2266
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;

2267
	ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2268 2269
	return ceph_monc_validate_auth(&osdc->client->monc);
}
2270

2271
static const struct ceph_connection_operations osd_con_ops = {
S
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2272 2273 2274
	.get = get_osd_con,
	.put = put_osd_con,
	.dispatch = dispatch,
2275 2276
	.get_authorizer = get_authorizer,
	.verify_authorizer_reply = verify_authorizer_reply,
2277
	.invalidate_authorizer = invalidate_authorizer,
S
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2278
	.alloc_msg = alloc_msg,
2279
	.fault = osd_reset,
S
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2280
};