osd_client.c 60.4 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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/*
 * 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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			u64 *objnum, u64 *objoff, u64 *objlen)
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{
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	u64 orig_len = *plen;
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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, objnum,
					  objoff, objlen);
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	if (r < 0)
		return r;
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	if (*objlen < orig_len) {
		*plen = *objlen;
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		dout(" skipping last %llu, final file extent %llu~%llu\n",
		     orig_len - *plen, off, *plen);
	}

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	dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *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_reply) {
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		ceph_msg_revoke_incoming(req->r_reply);
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		ceph_msg_put(req->r_reply);
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	}
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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 bool osd_req_opcode_valid(u16 opcode)
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{
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	switch (opcode) {
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	case CEPH_OSD_OP_READ:
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	case CEPH_OSD_OP_STAT:
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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_NOTIFY_ACK:
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	case CEPH_OSD_OP_ASSERT_VER:
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	case CEPH_OSD_OP_WRITE:
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	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:
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	case CEPH_OSD_OP_STARTSYNC:
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	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_WATCH:
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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_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:
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	case CEPH_OSD_OP_CALL:
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	case CEPH_OSD_OP_PGLS:
	case CEPH_OSD_OP_PGLS_FILTER:
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		return true;
	default:
		return false;
	}
}

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/*
 * This is an osd op init function for opcodes that have no data or
 * other information associated with them.  It also serves as a
 * common init routine for all the other init functions, below.
 */
void osd_req_op_init(struct ceph_osd_req_op *op, u16 opcode)
{
	BUG_ON(!osd_req_opcode_valid(opcode));

	memset(op, 0, sizeof (*op));

	op->op = opcode;
}

void osd_req_op_extent_init(struct ceph_osd_req_op *op, u16 opcode,
				u64 offset, u64 length,
				u64 truncate_size, u32 truncate_seq)
{
	size_t payload_len = 0;

	BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);

	osd_req_op_init(op, opcode);

	op->extent.offset = offset;
	op->extent.length = length;
	op->extent.truncate_size = truncate_size;
	op->extent.truncate_seq = truncate_seq;
	if (opcode == CEPH_OSD_OP_WRITE)
		payload_len += length;

	op->payload_len = payload_len;
}
EXPORT_SYMBOL(osd_req_op_extent_init);

void osd_req_op_cls_init(struct ceph_osd_req_op *op, u16 opcode,
			const char *class, const char *method,
			const void *request_data, size_t request_data_size)
{
	size_t payload_len = 0;
	size_t size;

	BUG_ON(opcode != CEPH_OSD_OP_CALL);

	osd_req_op_init(op, opcode);

	op->cls.class_name = class;
	size = strlen(class);
	BUG_ON(size > (size_t) U8_MAX);
	op->cls.class_len = size;
	payload_len += size;

	op->cls.method_name = method;
	size = strlen(method);
	BUG_ON(size > (size_t) U8_MAX);
	op->cls.method_len = size;
	payload_len += size;

	op->cls.indata = request_data;
	BUG_ON(request_data_size > (size_t) U32_MAX);
	op->cls.indata_len = (u32) request_data_size;
	payload_len += request_data_size;

	op->cls.argc = 0;	/* currently unused */

	op->payload_len = payload_len;
}
EXPORT_SYMBOL(osd_req_op_cls_init);

void osd_req_op_watch_init(struct ceph_osd_req_op *op, u16 opcode,
				u64 cookie, u64 version, int flag)
{
	BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);

	osd_req_op_init(op, opcode);

	op->watch.cookie = cookie;
	/* op->watch.ver = version; */	/* XXX 3847 */
	op->watch.ver = cpu_to_le64(version);
	if (opcode == CEPH_OSD_OP_WATCH && flag)
		op->watch.flag = (u8) 1;
}
EXPORT_SYMBOL(osd_req_op_watch_init);

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static u64 osd_req_encode_op(struct ceph_osd_request *req,
			      struct ceph_osd_op *dst,
			      struct ceph_osd_req_op *src)
{
	u64 out_data_len = 0;
	struct ceph_pagelist *pagelist;

	if (WARN_ON(!osd_req_opcode_valid(src->op))) {
		pr_err("unrecognized osd opcode %d\n", src->op);

		return 0;
	}

	switch (src->op) {
	case CEPH_OSD_OP_STAT:
		break;
	case CEPH_OSD_OP_READ:
	case CEPH_OSD_OP_WRITE:
		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);
		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_CALL:
		pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
		BUG_ON(!pagelist);
		ceph_pagelist_init(pagelist);

		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(pagelist, src->cls.class_name,
				     src->cls.class_len);
		ceph_pagelist_append(pagelist, src->cls.method_name,
				     src->cls.method_len);
		ceph_pagelist_append(pagelist, src->cls.indata,
				     src->cls.indata_len);

		req->r_data_out.type = CEPH_OSD_DATA_TYPE_PAGELIST;
		req->r_data_out.pagelist = pagelist;
		out_data_len = pagelist->length;
		break;
	case CEPH_OSD_OP_STARTSYNC:
		break;
	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;
	default:
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		pr_err("unsupported osd opcode %s\n",
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			ceph_osd_op_name(src->op));
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		WARN_ON(1);
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		return 0;
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	}
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	dst->op = cpu_to_le16(src->op);
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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,
542
					       bool use_mempool)
543
{
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	struct ceph_osd_req_op ops[2];
545
	struct ceph_osd_request *req;
546
	unsigned int num_op = do_sync ? 2 : 1;
547 548 549
	u64 objnum = 0;
	u64 objoff = 0;
	u64 objlen = 0;
550 551
	u32 object_size;
	u64 object_base;
552
	int r;
553

554
	BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);
555

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	req = ceph_osdc_alloc_request(osdc, snapc, num_op, use_mempool,
					GFP_NOFS);
558
	if (!req)
559
		return ERR_PTR(-ENOMEM);
560
	req->r_flags = flags;
561 562

	/* calculate max write size */
563
	r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
564 565
	if (r < 0) {
		ceph_osdc_put_request(req);
566
		return ERR_PTR(r);
567
	}
568

569 570 571 572 573 574 575 576
	object_size = le32_to_cpu(layout->fl_object_size);
	object_base = off - objoff;
	if (truncate_size <= object_base) {
		truncate_size = 0;
	} else {
		truncate_size -= object_base;
		if (truncate_size > object_size)
			truncate_size = object_size;
577
	}
578

579 580
	osd_req_op_extent_init(&ops[0], opcode, objoff, objlen,
				truncate_size, truncate_seq);
581
	if (do_sync)
582
		osd_req_op_init(&ops[1], CEPH_OSD_OP_STARTSYNC);
583

584 585
	req->r_file_layout = *layout;  /* keep a copy */

586 587
	snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx",
		vino.ino, objnum);
588 589
	req->r_oid_len = strlen(req->r_oid);

590
	ceph_osdc_build_request(req, off, num_op, ops,
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				snapc, vino.snap, mtime);
592

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	return req;
}
595
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)
{
668
	struct ceph_osd_request *req, *nreq;
669
	LIST_HEAD(resend);
670 671 672 673
	int err;

	dout("__kick_osd_requests osd%d\n", osd->o_osd);
	err = __reset_osd(osdc, osd);
674
	if (err)
675
		return;
676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692
	/*
	 * 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.
	 */
693
	list_for_each_entry(req, &osd->o_requests, r_osd_item) {
694 695 696 697
		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,
698
		     osd->o_osd);
699 700 701
		if (!req->r_linger)
			req->r_flags |= CEPH_OSD_FLAG_RETRY;
	}
702
	list_splice(&resend, &osdc->req_unsent);
703

704 705 706 707 708
	/*
	 * 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.
	 */
709 710
	list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
				 r_linger_osd) {
711 712 713 714 715
		/*
		 * reregister request prior to unregistering linger so
		 * that r_osd is preserved.
		 */
		BUG_ON(!list_empty(&req->r_req_lru_item));
716
		__register_request(osdc, req);
717
		list_add_tail(&req->r_req_lru_item, &osdc->req_unsent);
718
		list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
719
		__unregister_linger_request(osdc, req);
720 721
		dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
		     osd->o_osd);
722 723 724
	}
}

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/*
726
 * 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.
 */
748
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;
758
	osd->o_osd = onum;
759
	RB_CLEAR_NODE(&osd->o_node);
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	INIT_LIST_HEAD(&osd->o_requests);
761
	INIT_LIST_HEAD(&osd->o_linger_requests);
762
	INIT_LIST_HEAD(&osd->o_osd_lru);
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	osd->o_incarnation = 1;

765
	ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
766

767
	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);
787
	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;

790
		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
 */
798
static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
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{
800
	dout("__remove_osd %p\n", osd);
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	BUG_ON(!list_empty(&osd->o_requests));
	rb_erase(&osd->o_node, &osdc->osds);
803
	list_del_init(&osd->o_osd_lru);
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	ceph_con_close(&osd->o_con);
	put_osd(osd);
}

808 809
static void remove_all_osds(struct ceph_osd_client *osdc)
{
810
	dout("%s %p\n", __func__, osdc);
811 812 813 814 815 816 817 818 819
	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);
}

820 821 822 823 824 825
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);
826
	osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
827 828 829 830 831 832 833 834 835
}

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);
}

836
static void remove_old_osds(struct ceph_osd_client *osdc)
837 838 839 840 841 842
{
	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) {
843
		if (time_before(jiffies, osd->lru_ttl))
844 845 846 847 848 849
			break;
		__remove_osd(osdc, osd);
	}
	mutex_unlock(&osdc->request_mutex);
}

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/*
 * reset osd connect
 */
853
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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857
	dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
858 859
	if (list_empty(&osd->o_requests) &&
	    list_empty(&osd->o_linger_requests)) {
860
		__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;

870 871 872 873 874
		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;

892
	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;
}

925 926 927
static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
{
	schedule_delayed_work(&osdc->timeout_work,
928
			osdc->client->options->osd_keepalive_timeout * HZ);
929 930 931 932 933 934
}

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.
 */
940 941
static void __register_request(struct ceph_osd_client *osdc,
			       struct ceph_osd_request *req)
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{
	req->r_tid = ++osdc->last_tid;
944
	req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
945
	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) {
950 951
		dout(" first request, scheduling timeout\n");
		__schedule_osd_timeout(osdc);
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	}
953 954
}

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/*
 * called under osdc->request_mutex
 */
static void __unregister_request(struct ceph_osd_client *osdc,
				 struct ceph_osd_request *req)
{
961 962 963 964 965 966
	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--;

971 972
	if (req->r_osd) {
		/* make sure the original request isn't in flight. */
973
		ceph_msg_revoke(req->r_request);
974 975

		list_del_init(&req->r_osd_item);
976 977 978
		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);
979
			__move_osd_to_lru(osdc, req->r_osd);
980
		}
981
		if (list_empty(&req->r_linger_item))
982
			req->r_osd = NULL;
983
	}
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	list_del_init(&req->r_req_lru_item);
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	ceph_osdc_put_request(req);

988 989 990
	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)
{
999
	if (req->r_sent && req->r_osd) {
1000
		ceph_msg_revoke(req->r_request);
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		req->r_sent = 0;
	}
}

1005 1006 1007 1008 1009
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);
1010 1011 1012
	if (req->r_osd)
		list_add_tail(&req->r_linger_osd,
			      &req->r_osd->o_linger_requests);
1013 1014 1015 1016 1017 1018
}

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);
1020 1021 1022 1023 1024 1025 1026 1027
	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);
		}
1028 1029
		if (list_empty(&req->r_osd_item))
			req->r_osd = NULL;
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
	}
}

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
Lucas De Marchi 已提交
1063
 * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1064
 * (unsent, homeless) or leave on in-flight lru.
S
Sage Weil 已提交
1065 1066 1067 1068 1069
 *
 * Return 0 if unchanged, 1 if changed, or negative on error.
 *
 * Caller should hold map_sem for read and request_mutex.
 */
1070
static int __map_request(struct ceph_osd_client *osdc,
1071
			 struct ceph_osd_request *req, int force_resend)
S
Sage Weil 已提交
1072
{
1073
	struct ceph_pg pgid;
1074 1075
	int acting[CEPH_PG_MAX_SIZE];
	int o = -1, num = 0;
S
Sage Weil 已提交
1076 1077
	int err;

1078
	dout("map_request %p tid %lld\n", req, req->r_tid);
1079 1080
	err = ceph_calc_ceph_pg(&pgid, req->r_oid, osdc->osdmap,
				ceph_file_layout_pg_pool(req->r_file_layout));
1081 1082
	if (err) {
		list_move(&req->r_req_lru_item, &osdc->req_notarget);
S
Sage Weil 已提交
1083
		return err;
1084
	}
1085 1086
	req->r_pgid = pgid;

1087 1088 1089 1090 1091
	err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
	if (err > 0) {
		o = acting[0];
		num = err;
	}
S
Sage Weil 已提交
1092

1093 1094
	if ((!force_resend &&
	     req->r_osd && req->r_osd->o_osd == o &&
1095 1096 1097
	     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) ||
S
Sage Weil 已提交
1098 1099 1100
	    (req->r_osd == NULL && o == -1))
		return 0;  /* no change */

1101 1102
	dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
	     req->r_tid, pgid.pool, pgid.seed, o,
S
Sage Weil 已提交
1103 1104
	     req->r_osd ? req->r_osd->o_osd : -1);

1105 1106 1107 1108
	/* record full pg acting set */
	memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
	req->r_num_pg_osds = num;

S
Sage Weil 已提交
1109 1110 1111 1112 1113 1114 1115 1116
	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) {
1117
		err = -ENOMEM;
1118
		req->r_osd = create_osd(osdc, o);
1119 1120
		if (!req->r_osd) {
			list_move(&req->r_req_lru_item, &osdc->req_notarget);
1121
			goto out;
1122
		}
S
Sage Weil 已提交
1123

1124
		dout("map_request osd %p is osd%d\n", req->r_osd, o);
S
Sage Weil 已提交
1125 1126
		__insert_osd(osdc, req->r_osd);

1127 1128 1129
		ceph_con_open(&req->r_osd->o_con,
			      CEPH_ENTITY_TYPE_OSD, o,
			      &osdc->osdmap->osd_addr[o]);
S
Sage Weil 已提交
1130 1131
	}

1132 1133
	if (req->r_osd) {
		__remove_osd_from_lru(req->r_osd);
1134 1135
		list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
		list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1136
	} else {
1137
		list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1138
	}
1139
	err = 1;   /* osd or pg changed */
S
Sage Weil 已提交
1140 1141 1142 1143 1144 1145 1146 1147

out:
	return err;
}

/*
 * caller should hold map_sem (for read) and request_mutex
 */
1148 1149
static void __send_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req)
S
Sage Weil 已提交
1150
{
1151
	void *p;
S
Sage Weil 已提交
1152

1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
	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));
1167

S
Sage Weil 已提交
1168
	req->r_stamp = jiffies;
1169
	list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
S
Sage Weil 已提交
1170 1171 1172 1173 1174 1175

	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;
}

1176 1177 1178
/*
 * Send any requests in the queue (req_unsent).
 */
A
Alex Elder 已提交
1179
static void __send_queued(struct ceph_osd_client *osdc)
1180 1181 1182
{
	struct ceph_osd_request *req, *tmp;

A
Alex Elder 已提交
1183 1184
	dout("__send_queued\n");
	list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1185 1186 1187
		__send_request(osdc, req);
}

S
Sage Weil 已提交
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200
/*
 * 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
1201
	struct ceph_osd_request *req;
S
Sage Weil 已提交
1202
	struct ceph_osd *osd;
1203
	unsigned long keepalive =
1204
		osdc->client->options->osd_keepalive_timeout * HZ;
1205
	struct list_head slow_osds;
S
Sage Weil 已提交
1206 1207 1208 1209 1210 1211 1212
	dout("timeout\n");
	down_read(&osdc->map_sem);

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

	mutex_lock(&osdc->request_mutex);

1213 1214 1215 1216 1217 1218 1219
	/*
	 * 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
1220
		if (time_before(jiffies, req->r_stamp + keepalive))
1221 1222 1223 1224 1225
			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
1226
		     req->r_tid, osd->o_osd);
1227 1228 1229 1230 1231 1232
		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
1233 1234 1235
		ceph_con_keepalive(&osd->o_con);
	}

1236
	__schedule_osd_timeout(osdc);
A
Alex Elder 已提交
1237
	__send_queued(osdc);
S
Sage Weil 已提交
1238 1239 1240 1241
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
}

1242 1243 1244 1245 1246 1247
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 =
1248
		osdc->client->options->osd_idle_ttl * HZ >> 2;
1249 1250 1251

	dout("osds timeout\n");
	down_read(&osdc->map_sem);
1252
	remove_old_osds(osdc);
1253 1254 1255 1256 1257 1258
	up_read(&osdc->map_sem);

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

S
Sage Weil 已提交
1259 1260 1261 1262 1263 1264 1265
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
Sage Weil 已提交
1266 1267 1268 1269
/*
 * handle osd op reply.  either call the callback if it is specified,
 * or do the completion to wake up the waiting thread.
 */
1270 1271
static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
			 struct ceph_connection *con)
S
Sage Weil 已提交
1272
{
1273
	void *p, *end;
S
Sage Weil 已提交
1274 1275
	struct ceph_osd_request *req;
	u64 tid;
1276 1277
	int object_len;
	int numops, payload_len, flags;
1278
	s32 result;
1279 1280 1281 1282 1283 1284
	s32 retry_attempt;
	struct ceph_pg pg;
	int err;
	u32 reassert_epoch;
	u64 reassert_version;
	u32 osdmap_epoch;
1285
	int already_completed;
1286
	int i;
S
Sage Weil 已提交
1287

1288
	tid = le64_to_cpu(msg->hdr.tid);
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
	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;

1299
	err = ceph_decode_pgid(&p, end, &pg);
1300
	if (err)
S
Sage Weil 已提交
1301
		goto bad;
1302 1303 1304 1305 1306 1307 1308 1309

	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
1310 1311 1312 1313 1314
	/* lookup */
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (req == NULL) {
		dout("handle_reply tid %llu dne\n", tid);
1315
		goto bad_mutex;
S
Sage Weil 已提交
1316 1317
	}
	ceph_osdc_get_request(req);
1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349

	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
1350 1351

	if (!req->r_got_reply) {
1352
		unsigned int bytes;
S
Sage Weil 已提交
1353

1354
		req->r_result = result;
S
Sage Weil 已提交
1355 1356 1357 1358 1359 1360 1361
		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, */
1362 1363
		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
1364 1365 1366 1367

		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
1368
		mutex_unlock(&osdc->request_mutex);
S
Sage Weil 已提交
1369 1370 1371 1372 1373
		goto done;
	}

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

1374 1375 1376
	if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
		__register_linger_request(osdc, req);

S
Sage Weil 已提交
1377
	/* either this is a read, or we got the safe response */
1378 1379
	if (result < 0 ||
	    (flags & CEPH_OSD_FLAG_ONDISK) ||
S
Sage Weil 已提交
1380 1381 1382
	    ((flags & CEPH_OSD_FLAG_WRITE) == 0))
		__unregister_request(osdc, req);

1383 1384
	already_completed = req->r_completed;
	req->r_completed = 1;
S
Sage Weil 已提交
1385
	mutex_unlock(&osdc->request_mutex);
1386 1387
	if (already_completed)
		goto done;
S
Sage Weil 已提交
1388 1389 1390 1391

	if (req->r_callback)
		req->r_callback(req, msg);
	else
1392
		complete_all(&req->r_completion);
S
Sage Weil 已提交
1393

S
Sage Weil 已提交
1394 1395
	if (flags & CEPH_OSD_FLAG_ONDISK)
		complete_request(req);
S
Sage Weil 已提交
1396 1397

done:
1398
	dout("req=%p req->r_linger=%d\n", req, req->r_linger);
S
Sage Weil 已提交
1399 1400 1401
	ceph_osdc_put_request(req);
	return;

1402 1403
bad_put:
	ceph_osdc_put_request(req);
1404 1405
bad_mutex:
	mutex_unlock(&osdc->request_mutex);
S
Sage Weil 已提交
1406
bad:
1407 1408
	pr_err("corrupt osd_op_reply got %d %d\n",
	       (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1409
	ceph_msg_dump(msg);
S
Sage Weil 已提交
1410 1411
}

1412
static void reset_changed_osds(struct ceph_osd_client *osdc)
S
Sage Weil 已提交
1413 1414 1415
{
	struct rb_node *p, *n;

1416 1417
	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
1418

1419 1420 1421 1422 1423 1424 1425
		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
1426
	}
1427 1428 1429
}

/*
1430 1431
 * Requeue requests whose mapping to an OSD has changed.  If requests map to
 * no osd, request a new map.
1432
 *
1433
 * Caller should hold map_sem for read.
1434
 */
1435
static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1436
{
1437
	struct ceph_osd_request *req, *nreq;
1438 1439 1440
	struct rb_node *p;
	int needmap = 0;
	int err;
1441

1442
	dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1443
	mutex_lock(&osdc->request_mutex);
1444
	for (p = rb_first(&osdc->requests); p; ) {
1445
		req = rb_entry(p, struct ceph_osd_request, r_node);
1446
		p = rb_next(p);
1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464

		/*
		 * 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;
		}

1465
		err = __map_request(osdc, req, force_resend);
1466 1467 1468 1469 1470 1471
		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) {
1472 1473 1474 1475
			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);
1476
				req->r_flags |= CEPH_OSD_FLAG_RETRY;
1477 1478
			}
		}
1479 1480 1481 1482 1483 1484
	}

	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);

1485
		err = __map_request(osdc, req, force_resend);
1486
		dout("__map_request returned %d\n", err);
1487 1488 1489 1490 1491 1492 1493 1494
		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;
1495
		}
1496 1497 1498 1499

		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);
1500
		__unregister_linger_request(osdc, req);
1501
	}
S
Sage Weil 已提交
1502 1503 1504 1505 1506 1507
	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);
	}
1508
	reset_changed_osds(osdc);
1509
}
1510 1511


S
Sage Weil 已提交
1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534
/*
 * 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));
1535 1536
	if (ceph_check_fsid(osdc->client, &fsid) < 0)
		return;
S
Sage Weil 已提交
1537 1538 1539 1540 1541 1542 1543 1544

	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);
1545 1546
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1547 1548 1549 1550 1551 1552 1553
		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,
1554
							  &osdc->client->msgr);
S
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1555 1556 1557 1558
			if (IS_ERR(newmap)) {
				err = PTR_ERR(newmap);
				goto bad;
			}
1559
			BUG_ON(!newmap);
S
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1560 1561 1562 1563
			if (newmap != osdc->osdmap) {
				ceph_osdmap_destroy(osdc->osdmap);
				osdc->osdmap = newmap;
			}
1564
			kick_requests(osdc, 0);
S
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1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579
		} 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);
1580 1581
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1582 1583 1584 1585 1586 1587 1588 1589 1590
		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 {
1591 1592
			int skipped_map = 0;

S
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1593 1594 1595 1596 1597 1598
			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;
			}
1599
			BUG_ON(!newmap);
S
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1600 1601
			oldmap = osdc->osdmap;
			osdc->osdmap = newmap;
1602 1603 1604
			if (oldmap) {
				if (oldmap->epoch + 1 < newmap->epoch)
					skipped_map = 1;
S
Sage Weil 已提交
1605
				ceph_osdmap_destroy(oldmap);
1606 1607
			}
			kick_requests(osdc, skipped_map);
S
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1608 1609 1610 1611 1612 1613 1614 1615
		}
		p += maplen;
		nr_maps--;
	}

done:
	downgrade_write(&osdc->map_sem);
	ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1616 1617 1618 1619 1620 1621 1622 1623 1624

	/*
	 * 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
1625 1626 1627
	mutex_lock(&osdc->request_mutex);
	__send_queued(osdc);
	mutex_unlock(&osdc->request_mutex);
S
Sage Weil 已提交
1628
	up_read(&osdc->map_sem);
1629
	wake_up_all(&osdc->client->auth_wq);
S
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1630 1631 1632 1633
	return;

bad:
	pr_err("osdc handle_map corrupt msg\n");
1634
	ceph_msg_dump(msg);
S
Sage Weil 已提交
1635 1636 1637 1638
	up_write(&osdc->map_sem);
	return;
}

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 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 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
/*
 * 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 *),
1721
			   void *data, struct ceph_osd_event **pevent)
1722 1723 1724 1725 1726 1727 1728 1729 1730
{
	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;
1731
	event->one_shot = 0;
1732 1733 1734
	event->data = data;
	event->osdc = osdc;
	INIT_LIST_HEAD(&event->osd_node);
1735
	RB_CLEAR_NODE(&event->node);
1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781
	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
 */
1782 1783
static void handle_watch_notify(struct ceph_osd_client *osdc,
				struct ceph_msg *msg)
1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
{
	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) {
1804
		BUG_ON(event->one_shot);
1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815
		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;
		}
1816
		INIT_WORK(&event_work->work, do_event_work);
1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837
		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;
}

1838 1839
static void ceph_osdc_msg_data_set(struct ceph_msg *msg,
				struct ceph_osd_data *osd_data)
S
Sage Weil 已提交
1840
{
1841
	if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
1842
		BUG_ON(osd_data->length > (u64) SIZE_MAX);
1843
		if (osd_data->length)
1844 1845
			ceph_msg_data_set_pages(msg, osd_data->pages,
				osd_data->length, osd_data->alignment);
1846 1847 1848
	} 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);
1849
#ifdef CONFIG_BLOCK
1850
	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
A
Alex Elder 已提交
1851
		ceph_msg_data_set_bio(msg, osd_data->bio, osd_data->bio_length);
1852
#endif
1853
	} else {
1854
		BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
1855
	}
1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870
}

/*
 * 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
1871 1872 1873

	down_read(&osdc->map_sem);
	mutex_lock(&osdc->request_mutex);
1874
	__register_request(osdc, req);
1875 1876 1877 1878 1879 1880 1881
	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
1882
		}
1883
		goto out_unlock;
S
Sage Weil 已提交
1884
	}
1885 1886 1887 1888
	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 {
1889
		__send_queued(osdc);
1890 1891
	}
	rc = 0;
1892
out_unlock:
S
Sage Weil 已提交
1893 1894 1895 1896
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
	return rc;
}
1897
EXPORT_SYMBOL(ceph_osdc_start_request);
S
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1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910

/*
 * 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);
1911
		__unregister_request(osdc, req);
S
Sage Weil 已提交
1912
		mutex_unlock(&osdc->request_mutex);
S
Sage Weil 已提交
1913
		complete_request(req);
1914
		dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
S
Sage Weil 已提交
1915 1916 1917 1918 1919 1920
		return rc;
	}

	dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
	return req->r_result;
}
1921
EXPORT_SYMBOL(ceph_osdc_wait_request);
S
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1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954

/*
 * 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);
}
1955
EXPORT_SYMBOL(ceph_osdc_sync);
S
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1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972

/*
 * 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;
1973
	INIT_LIST_HEAD(&osdc->osd_lru);
S
Sage Weil 已提交
1974
	osdc->requests = RB_ROOT;
1975
	INIT_LIST_HEAD(&osdc->req_lru);
1976 1977
	INIT_LIST_HEAD(&osdc->req_unsent);
	INIT_LIST_HEAD(&osdc->req_notarget);
1978
	INIT_LIST_HEAD(&osdc->req_linger);
S
Sage Weil 已提交
1979 1980
	osdc->num_requests = 0;
	INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1981
	INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1982 1983 1984
	spin_lock_init(&osdc->event_lock);
	osdc->event_tree = RB_ROOT;
	osdc->event_count = 0;
1985 1986

	schedule_delayed_work(&osdc->osds_timeout_work,
1987
	   round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
S
Sage Weil 已提交
1988

1989
	err = -ENOMEM;
S
Sage Weil 已提交
1990 1991 1992
	osdc->req_mempool = mempool_create_kmalloc_pool(10,
					sizeof(struct ceph_osd_request));
	if (!osdc->req_mempool)
1993
		goto out;
S
Sage Weil 已提交
1994

1995 1996
	err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
				OSD_OP_FRONT_LEN, 10, true,
1997
				"osd_op");
S
Sage Weil 已提交
1998
	if (err < 0)
1999
		goto out_mempool;
2000
	err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2001 2002
				OSD_OPREPLY_FRONT_LEN, 10, true,
				"osd_op_reply");
S
Sage Weil 已提交
2003 2004
	if (err < 0)
		goto out_msgpool;
2005 2006 2007 2008 2009 2010 2011

	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
2012
	return 0;
2013

S
Sage Weil 已提交
2014 2015
out_msgpool:
	ceph_msgpool_destroy(&osdc->msgpool_op);
2016 2017 2018 2019
out_mempool:
	mempool_destroy(osdc->req_mempool);
out:
	return err;
S
Sage Weil 已提交
2020 2021 2022 2023
}

void ceph_osdc_stop(struct ceph_osd_client *osdc)
{
2024 2025
	flush_workqueue(osdc->notify_wq);
	destroy_workqueue(osdc->notify_wq);
S
Sage Weil 已提交
2026
	cancel_delayed_work_sync(&osdc->timeout_work);
2027
	cancel_delayed_work_sync(&osdc->osds_timeout_work);
S
Sage Weil 已提交
2028 2029 2030 2031
	if (osdc->osdmap) {
		ceph_osdmap_destroy(osdc->osdmap);
		osdc->osdmap = NULL;
	}
2032
	remove_all_osds(osdc);
S
Sage Weil 已提交
2033 2034
	mempool_destroy(osdc->req_mempool);
	ceph_msgpool_destroy(&osdc->msgpool_op);
S
Sage Weil 已提交
2035
	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
S
Sage Weil 已提交
2036 2037 2038 2039 2040 2041 2042 2043 2044 2045
}

/*
 * 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,
2046
			struct page **pages, int num_pages, int page_align)
S
Sage Weil 已提交
2047 2048
{
	struct ceph_osd_request *req;
2049
	struct ceph_osd_data *osd_data;
S
Sage Weil 已提交
2050 2051 2052 2053 2054 2055 2056
	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,
2057
				    false);
2058 2059
	if (IS_ERR(req))
		return PTR_ERR(req);
S
Sage Weil 已提交
2060 2061

	/* it may be a short read due to an object boundary */
2062 2063 2064 2065

	osd_data = &req->r_data_in;
	osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
	osd_data->pages = pages;
2066
	osd_data->length = *plen;
2067
	osd_data->alignment = page_align;
S
Sage Weil 已提交
2068

2069 2070
	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
2071 2072 2073 2074 2075 2076 2077 2078 2079

	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;
}
2080
EXPORT_SYMBOL(ceph_osdc_readpages);
S
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2081 2082 2083 2084 2085 2086 2087 2088 2089 2090

/*
 * 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,
2091
			 struct page **pages, int num_pages)
S
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2092 2093
{
	struct ceph_osd_request *req;
2094
	struct ceph_osd_data *osd_data;
S
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2095
	int rc = 0;
2096
	int page_align = off & ~PAGE_MASK;
S
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2097 2098 2099 2100

	BUG_ON(vino.snap != CEPH_NOSNAP);
	req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
				    CEPH_OSD_OP_WRITE,
2101
				    CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2102
				    snapc, 0,
S
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2103
				    truncate_seq, truncate_size, mtime,
2104
				    true);
2105 2106
	if (IS_ERR(req))
		return PTR_ERR(req);
S
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2107 2108

	/* it may be a short write due to an object boundary */
2109 2110 2111
	osd_data = &req->r_data_out;
	osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
	osd_data->pages = pages;
2112
	osd_data->length = len;
2113
	osd_data->alignment = page_align;
2114
	dout("writepages %llu~%llu (%llu bytes)\n", off, len, osd_data->length);
S
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2115

2116
	rc = ceph_osdc_start_request(osdc, req, true);
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2117 2118 2119 2120 2121 2122 2123 2124 2125
	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;
}
2126
EXPORT_SYMBOL(ceph_osdc_writepages);
S
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2127 2128 2129 2130 2131 2132 2133

/*
 * handle incoming message
 */
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
{
	struct ceph_osd *osd = con->private;
2134
	struct ceph_osd_client *osdc;
S
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2135 2136 2137
	int type = le16_to_cpu(msg->hdr.type);

	if (!osd)
S
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2138
		goto out;
2139
	osdc = osd->o_osdc;
S
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2140 2141 2142 2143 2144 2145

	switch (type) {
	case CEPH_MSG_OSD_MAP:
		ceph_osdc_handle_map(osdc, msg);
		break;
	case CEPH_MSG_OSD_OPREPLY:
2146
		handle_reply(osdc, msg, con);
S
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2147
		break;
2148 2149 2150
	case CEPH_MSG_WATCH_NOTIFY:
		handle_watch_notify(osdc, msg);
		break;
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2151 2152 2153 2154 2155

	default:
		pr_err("received unknown message type %d %s\n", type,
		       ceph_msg_type_name(type));
	}
S
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2156
out:
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2157 2158 2159
	ceph_msg_put(msg);
}

2160
/*
2161 2162
 * lookup and return message for incoming reply.  set up reply message
 * pages.
2163 2164
 */
static struct ceph_msg *get_reply(struct ceph_connection *con,
2165 2166
				  struct ceph_msg_header *hdr,
				  int *skip)
S
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2167 2168 2169
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc = osd->o_osdc;
2170
	struct ceph_msg *m;
2171
	struct ceph_osd_request *req;
2172 2173
	int front = le32_to_cpu(hdr->front_len);
	int data_len = le32_to_cpu(hdr->data_len);
2174
	u64 tid;
S
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2175

2176 2177 2178 2179 2180 2181
	tid = le64_to_cpu(hdr->tid);
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (!req) {
		*skip = 1;
		m = NULL;
2182 2183
		dout("get_reply unknown tid %llu from osd%d\n", tid,
		     osd->o_osd);
2184 2185
		goto out;
	}
S
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2186

2187
	if (req->r_reply->con)
2188
		dout("%s revoking msg %p from old con %p\n", __func__,
2189 2190
		     req->r_reply, req->r_reply->con);
	ceph_msg_revoke_incoming(req->r_reply);
2191

S
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2192 2193 2194
	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);
2195
		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2196
		if (!m)
S
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2197 2198 2199 2200 2201 2202
			goto out;
		ceph_msg_put(req->r_reply);
		req->r_reply = m;
	}
	m = ceph_msg_get(req->r_reply);

2203
	if (data_len > 0) {
2204 2205 2206 2207
		struct ceph_osd_data *osd_data = &req->r_data_in;

		if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
			if (osd_data->pages &&
2208
				unlikely(osd_data->length < data_len)) {
2209

2210 2211 2212
				pr_warning("tid %lld reply has %d bytes "
					"we had only %llu bytes ready\n",
					tid, data_len, osd_data->length);
2213 2214 2215 2216 2217 2218
				*skip = 1;
				ceph_msg_put(m);
				m = NULL;
				goto out;
			}
		}
2219
	}
2220
	*skip = 0;
S
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2221
	dout("get_reply tid %lld %p\n", tid, m);
2222 2223 2224

out:
	mutex_unlock(&osdc->request_mutex);
2225
	return m;
2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236

}

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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2237
	*skip = 0;
2238 2239
	switch (type) {
	case CEPH_MSG_OSD_MAP:
2240
	case CEPH_MSG_WATCH_NOTIFY:
2241
		return ceph_msg_new(type, front, GFP_NOFS, false);
2242 2243 2244 2245 2246 2247 2248 2249
	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
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2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268
}

/*
 * 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);
}

2269 2270 2271
/*
 * authentication
 */
2272 2273 2274 2275 2276
/*
 * 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,
2277
					int *proto, int force_new)
2278 2279 2280 2281
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;
2282
	struct ceph_auth_handshake *auth = &o->o_auth;
2283

2284
	if (force_new && auth->authorizer) {
2285
		ceph_auth_destroy_authorizer(ac, auth->authorizer);
2286 2287
		auth->authorizer = NULL;
	}
2288 2289 2290
	if (!auth->authorizer) {
		int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
						      auth);
2291
		if (ret)
2292
			return ERR_PTR(ret);
2293 2294
	} else {
		int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2295 2296 2297
						     auth);
		if (ret)
			return ERR_PTR(ret);
2298 2299
	}
	*proto = ac->protocol;
2300

2301
	return auth;
2302 2303 2304 2305 2306 2307 2308 2309 2310
}


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;

2311
	return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2312 2313
}

2314 2315 2316 2317 2318 2319
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;

2320
	ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2321 2322
	return ceph_monc_validate_auth(&osdc->client->monc);
}
2323

2324
static const struct ceph_connection_operations osd_con_ops = {
S
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2325 2326 2327
	.get = get_osd_con,
	.put = put_osd_con,
	.dispatch = dispatch,
2328 2329
	.get_authorizer = get_authorizer,
	.verify_authorizer_reply = verify_authorizer_reply,
2330
	.invalidate_authorizer = invalidate_authorizer,
S
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2331
	.alloc_msg = alloc_msg,
2332
	.fault = osd_reset,
S
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2333
};