osd_client.c 54.8 KB
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#include <linux/ceph/ceph_debug.h>
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#include <linux/module.h>
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#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
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#ifdef CONFIG_BLOCK
#include <linux/bio.h>
#endif
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#include <linux/ceph/libceph.h>
#include <linux/ceph/osd_client.h>
#include <linux/ceph/messenger.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/auth.h>
#include <linux/ceph/pagelist.h>
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#define OSD_OP_FRONT_LEN	4096
#define OSD_OPREPLY_FRONT_LEN	512
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static const struct ceph_connection_operations osd_con_ops;
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static void send_queued(struct ceph_osd_client *osdc);
static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
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static void __register_request(struct ceph_osd_client *osdc,
			       struct ceph_osd_request *req);
static void __unregister_linger_request(struct ceph_osd_client *osdc,
					struct ceph_osd_request *req);
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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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int ceph_calc_raw_layout(struct ceph_file_layout *layout,
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			u64 off, u64 *plen, u64 *bno,
			struct ceph_osd_request *req,
			struct ceph_osd_req_op *op)
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{
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	u64 orig_len = *plen;
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	u64 objoff, objlen;    /* extent in object */
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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);
	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",
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		     orig_len - *plen, off, *plen);
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	}
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	if (op_has_extent(op->op)) {
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		u32 osize = le32_to_cpu(layout->fl_object_size);
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		op->extent.offset = objoff;
		op->extent.length = objlen;
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		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;
		}
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	}
	req->r_num_pages = calc_pages_for(off, *plen);
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	req->r_page_alignment = off & ~PAGE_MASK;
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	if (op->op == CEPH_OSD_OP_WRITE)
		op->payload_len = *plen;
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	dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
	     *bno, objoff, objlen, req->r_num_pages);
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	return 0;
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}
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EXPORT_SYMBOL(ceph_calc_raw_layout);
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/*
 * Implement client access to distributed object storage cluster.
 *
 * All data objects are stored within a cluster/cloud of OSDs, or
 * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
 * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
 * remote daemons serving up and coordinating consistent and safe
 * access to storage.
 *
 * Cluster membership and the mapping of data objects onto storage devices
 * are described by the osd map.
 *
 * We keep track of pending OSD requests (read, write), resubmit
 * requests to different OSDs when the cluster topology/data layout
 * change, or retry the affected requests when the communications
 * channel with an OSD is reset.
 */

/*
 * calculate the mapping of a file extent onto an object, and fill out the
 * request accordingly.  shorten extent as necessary if it crosses an
 * object boundary.
 *
 * fill osd op in request message.
 */
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static int calc_layout(struct ceph_vino vino,
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		       struct ceph_file_layout *layout,
		       u64 off, u64 *plen,
		       struct ceph_osd_request *req,
		       struct ceph_osd_req_op *op)
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{
	u64 bno;
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	int r;
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	r = ceph_calc_raw_layout(layout, off, plen, &bno, req, op);
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	if (r < 0)
		return r;
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	snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno);
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	req->r_oid_len = strlen(req->r_oid);
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	return r;
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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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	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 pages %p from con %p\n", __func__,
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		     req->r_pages, 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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	}
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	if (req->r_reply)
		ceph_msg_put(req->r_reply);
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	if (req->r_own_pages)
		ceph_release_page_vector(req->r_pages,
					 req->r_num_pages);
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#ifdef CONFIG_BLOCK
	if (req->r_bio)
		bio_put(req->r_bio);
#endif
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	ceph_put_snap_context(req->r_snapc);
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	ceph_pagelist_release(&req->r_trail);
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	if (req->r_mempool)
		mempool_free(req, req->r_osdc->req_mempool);
	else
		kfree(req);
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}
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EXPORT_SYMBOL(ceph_osdc_release_request);
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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_op,
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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 = sizeof(struct ceph_osd_request_head);
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	msg_size += num_op*sizeof(struct ceph_osd_op);
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	if (use_mempool) {
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		req = mempool_alloc(osdc->req_mempool, gfp_flags);
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		memset(req, 0, sizeof(*req));
	} else {
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		req = kzalloc(sizeof(*req), gfp_flags);
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	}
	if (req == NULL)
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		return NULL;
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	req->r_osdc = osdc;
	req->r_mempool = use_mempool;
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	kref_init(&req->r_kref);
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	init_completion(&req->r_completion);
	init_completion(&req->r_safe_completion);
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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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	ceph_pagelist_init(&req->r_trail);
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	/* create request message; allow space for oid */
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	msg_size += MAX_OBJ_NAME_SIZE;
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	if (snapc)
		msg_size += sizeof(u64) * snapc->num_snaps;
	if (use_mempool)
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		msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
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	else
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		msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, 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 void osd_req_encode_op(struct ceph_osd_request *req,
			      struct ceph_osd_op *dst,
			      struct ceph_osd_req_op *src)
{
	dst->op = cpu_to_le16(src->op);

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

	case CEPH_OSD_OP_GETXATTR:
	case CEPH_OSD_OP_SETXATTR:
	case CEPH_OSD_OP_CMPXATTR:
		dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
		dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
		dst->xattr.cmp_op = src->xattr.cmp_op;
		dst->xattr.cmp_mode = src->xattr.cmp_mode;
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		ceph_pagelist_append(&req->r_trail, src->xattr.name,
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				     src->xattr.name_len);
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		ceph_pagelist_append(&req->r_trail, src->xattr.val,
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				     src->xattr.value_len);
		break;
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	case CEPH_OSD_OP_CALL:
		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(&req->r_trail, src->cls.class_name,
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				     src->cls.class_len);
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		ceph_pagelist_append(&req->r_trail, src->cls.method_name,
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				     src->cls.method_len);
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		ceph_pagelist_append(&req->r_trail, src->cls.indata,
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				     src->cls.indata_len);
		break;
	case CEPH_OSD_OP_ROLLBACK:
		dst->snap.snapid = cpu_to_le64(src->snap.snapid);
		break;
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	case CEPH_OSD_OP_STARTSYNC:
		break;
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	case CEPH_OSD_OP_NOTIFY:
		{
			__le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
			__le32 timeout = cpu_to_le32(src->watch.timeout);

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

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/*
 * build new request AND message
 *
 */
void ceph_osdc_build_request(struct ceph_osd_request *req,
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			     u64 off, u64 len, unsigned int num_op,
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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;
	struct ceph_osd_request_head *head;
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	struct ceph_osd_req_op *src_op;
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	struct ceph_osd_op *op;
	void *p;
	size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
	int flags = req->r_flags;
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	u64 data_len = 0;
	int i;
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	WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);

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	head = msg->front.iov_base;
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	head->snapid = cpu_to_le64(snap_id);
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	op = (void *)(head + 1);
	p = (void *)(op + num_op);

	req->r_snapc = ceph_get_snap_context(snapc);

	head->client_inc = cpu_to_le32(1); /* always, for now. */
	head->flags = cpu_to_le32(flags);
	if (flags & CEPH_OSD_FLAG_WRITE)
		ceph_encode_timespec(&head->mtime, mtime);
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	BUG_ON(num_op > (unsigned int) ((u16) -1));
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	head->num_ops = cpu_to_le16(num_op);

	/* fill in oid */
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	head->object_len = cpu_to_le32(req->r_oid_len);
	memcpy(p, req->r_oid, req->r_oid_len);
	p += req->r_oid_len;
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	src_op = src_ops;
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	while (num_op--)
		osd_req_encode_op(req, op++, src_op++);
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	data_len += req->r_trail.length;
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	if (snapc) {
		head->snap_seq = cpu_to_le64(snapc->seq);
		head->num_snaps = cpu_to_le32(snapc->num_snaps);
		for (i = 0; i < snapc->num_snaps; i++) {
			put_unaligned_le64(snapc->snaps[i], p);
			p += sizeof(u64);
		}
	}

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

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

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	BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
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	msg_size = p - msg->front.iov_base;
	msg->front.iov_len = msg_size;
	msg->hdr.front_len = cpu_to_le32(msg_size);
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	return;
}
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EXPORT_SYMBOL(ceph_osdc_build_request);
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/*
 * build new request AND message, calculate layout, and adjust file
 * extent as needed.
 *
 * if the file was recently truncated, we include information about its
 * old and new size so that the object can be updated appropriately.  (we
 * avoid synchronously deleting truncated objects because it's slow.)
 *
 * if @do_sync, include a 'startsync' command so that the osd will flush
 * data quickly.
 */
struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
					       struct ceph_file_layout *layout,
					       struct ceph_vino vino,
					       u64 off, u64 *plen,
					       int opcode, int flags,
					       struct ceph_snap_context *snapc,
					       int do_sync,
					       u32 truncate_seq,
					       u64 truncate_size,
					       struct timespec *mtime,
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					       bool use_mempool, int num_reply,
					       int page_align)
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{
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	struct ceph_osd_req_op ops[2];
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	struct ceph_osd_request *req;
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	unsigned int num_op = 1;
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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(vino, layout, off, plen, req, ops);
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	if (r < 0)
		return ERR_PTR(r);
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	req->r_file_layout = *layout;  /* keep a copy */

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

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

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

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

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

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

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

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

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

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

	list_for_each_entry(req, &osd->o_requests, r_osd_item) {
		list_move(&req->r_req_lru_item, &osdc->req_unsent);
		dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
		     osd->o_osd);
525 526 527 528 529 530
		if (!req->r_linger)
			req->r_flags |= CEPH_OSD_FLAG_RETRY;
	}

	list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
				 r_linger_osd) {
531 532 533 534 535
		/*
		 * reregister request prior to unregistering linger so
		 * that r_osd is preserved.
		 */
		BUG_ON(!list_empty(&req->r_req_lru_item));
536
		__register_request(osdc, req);
537 538 539
		list_add(&req->r_req_lru_item, &osdc->req_unsent);
		list_add(&req->r_osd_item, &req->r_osd->o_requests);
		__unregister_linger_request(osdc, req);
540 541
		dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
		     osd->o_osd);
542 543 544
	}
}

S
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545
/*
546
 * If the osd connection drops, we need to resubmit all requests.
S
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547 548 549 550 551 552 553 554 555 556 557
 */
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);
S
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558 559 560
	mutex_lock(&osdc->request_mutex);
	__kick_osd_requests(osdc, osd);
	mutex_unlock(&osdc->request_mutex);
561
	send_queued(osdc);
S
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562 563 564 565 566 567
	up_read(&osdc->map_sem);
}

/*
 * Track open sessions with osds.
 */
568
static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
S
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569 570 571 572 573 574 575 576 577
{
	struct ceph_osd *osd;

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

	atomic_set(&osd->o_ref, 1);
	osd->o_osdc = osdc;
578
	osd->o_osd = onum;
579
	RB_CLEAR_NODE(&osd->o_node);
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580
	INIT_LIST_HEAD(&osd->o_requests);
581
	INIT_LIST_HEAD(&osd->o_linger_requests);
582
	INIT_LIST_HEAD(&osd->o_osd_lru);
S
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583 584
	osd->o_incarnation = 1;

585
	ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
586

587
	INIT_LIST_HEAD(&osd->o_keepalive_item);
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588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606
	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);
607
	if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
S
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608 609
		struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;

610
		if (ac->ops && ac->ops->destroy_authorizer)
611
			ac->ops->destroy_authorizer(ac, osd->o_auth.authorizer);
S
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612
		kfree(osd);
S
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613
	}
S
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614 615 616 617 618
}

/*
 * remove an osd from our map
 */
619
static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
S
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620
{
621
	dout("__remove_osd %p\n", osd);
S
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622 623
	BUG_ON(!list_empty(&osd->o_requests));
	rb_erase(&osd->o_node, &osdc->osds);
624
	list_del_init(&osd->o_osd_lru);
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625 626 627 628
	ceph_con_close(&osd->o_con);
	put_osd(osd);
}

629 630
static void remove_all_osds(struct ceph_osd_client *osdc)
{
631
	dout("%s %p\n", __func__, osdc);
632 633 634 635 636 637 638 639 640
	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);
}

641 642 643 644 645 646
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);
647
	osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
648 649 650 651 652 653 654 655 656
}

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);
}

657
static void remove_old_osds(struct ceph_osd_client *osdc)
658 659 660 661 662 663
{
	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) {
664
		if (time_before(jiffies, osd->lru_ttl))
665 666 667 668 669 670
			break;
		__remove_osd(osdc, osd);
	}
	mutex_unlock(&osdc->request_mutex);
}

S
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671 672 673
/*
 * reset osd connect
 */
674
static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
S
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675
{
A
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676
	struct ceph_entity_addr *peer_addr;
S
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677

678
	dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
679 680
	if (list_empty(&osd->o_requests) &&
	    list_empty(&osd->o_linger_requests)) {
681
		__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;

691 692 693 694 695
		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;
A
Alex Elder 已提交
696 697

		return -EAGAIN;
S
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698
	}
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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;

713
	dout("__insert_osd %p osd%d\n", new, new->o_osd);
S
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714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745
	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;
}

746 747 748
static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
{
	schedule_delayed_work(&osdc->timeout_work,
749
			osdc->client->options->osd_keepalive_timeout * HZ);
750 751 752 753 754 755
}

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.
 */
761 762
static void __register_request(struct ceph_osd_client *osdc,
			       struct ceph_osd_request *req)
S
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763 764
{
	req->r_tid = ++osdc->last_tid;
765
	req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
766
	dout("__register_request %p tid %lld\n", req, req->r_tid);
S
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767 768 769 770
	__insert_request(osdc, req);
	ceph_osdc_get_request(req);
	osdc->num_requests++;
	if (osdc->num_requests == 1) {
771 772
		dout(" first request, scheduling timeout\n");
		__schedule_osd_timeout(osdc);
S
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773
	}
774 775 776 777 778 779 780
}

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

/*
 * called under osdc->request_mutex
 */
static void __unregister_request(struct ceph_osd_client *osdc,
				 struct ceph_osd_request *req)
{
790 791 792 793 794 795
	if (RB_EMPTY_NODE(&req->r_node)) {
		dout("__unregister_request %p tid %lld not registered\n",
			req, req->r_tid);
		return;
	}

S
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796 797 798 799
	dout("__unregister_request %p tid %lld\n", req, req->r_tid);
	rb_erase(&req->r_node, &osdc->requests);
	osdc->num_requests--;

800 801
	if (req->r_osd) {
		/* make sure the original request isn't in flight. */
802
		ceph_msg_revoke(req->r_request);
803 804

		list_del_init(&req->r_osd_item);
805 806 807
		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);
808
			__move_osd_to_lru(osdc, req->r_osd);
809
		}
810
		if (list_empty(&req->r_linger_item))
811
			req->r_osd = NULL;
812
	}
S
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813

A
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814
	list_del_init(&req->r_req_lru_item);
S
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815 816
	ceph_osdc_put_request(req);

817 818 819
	if (osdc->num_requests == 0) {
		dout(" no requests, canceling timeout\n");
		__cancel_osd_timeout(osdc);
S
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820 821 822 823 824 825 826 827
	}
}

/*
 * Cancel a previously queued request message
 */
static void __cancel_request(struct ceph_osd_request *req)
{
828
	if (req->r_sent && req->r_osd) {
829
		ceph_msg_revoke(req->r_request);
S
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830 831 832 833
		req->r_sent = 0;
	}
}

834 835 836 837 838
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);
839 840 841
	if (req->r_osd)
		list_add_tail(&req->r_linger_osd,
			      &req->r_osd->o_linger_requests);
842 843 844 845 846 847
}

static void __unregister_linger_request(struct ceph_osd_client *osdc,
					struct ceph_osd_request *req)
{
	dout("__unregister_linger_request %p\n", req);
A
Alex Elder 已提交
848
	list_del_init(&req->r_linger_item);
849 850 851 852 853 854 855 856
	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);
		}
857 858
		if (list_empty(&req->r_osd_item))
			req->r_osd = NULL;
859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888
	}
}

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);

S
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889 890 891
/*
 * 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
892
 * no up osd, set r_osd to NULL.  Move the request to the appropriate list
893
 * (unsent, homeless) or leave on in-flight lru.
S
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894 895 896 897 898
 *
 * Return 0 if unchanged, 1 if changed, or negative on error.
 *
 * Caller should hold map_sem for read and request_mutex.
 */
899
static int __map_request(struct ceph_osd_client *osdc,
900
			 struct ceph_osd_request *req, int force_resend)
S
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901 902
{
	struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
903
	struct ceph_pg pgid;
904 905
	int acting[CEPH_PG_MAX_SIZE];
	int o = -1, num = 0;
S
Sage Weil 已提交
906 907
	int err;

908
	dout("map_request %p tid %lld\n", req, req->r_tid);
S
Sage Weil 已提交
909 910
	err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
				      &req->r_file_layout, osdc->osdmap);
911 912
	if (err) {
		list_move(&req->r_req_lru_item, &osdc->req_notarget);
S
Sage Weil 已提交
913
		return err;
914
	}
915
	pgid = reqhead->layout.ol_pgid;
916 917
	req->r_pgid = pgid;

918 919 920 921 922
	err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
	if (err > 0) {
		o = acting[0];
		num = err;
	}
S
Sage Weil 已提交
923

924 925
	if ((!force_resend &&
	     req->r_osd && req->r_osd->o_osd == o &&
926 927 928
	     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
929 930 931
	    (req->r_osd == NULL && o == -1))
		return 0;  /* no change */

932
	dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
933
	     req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
S
Sage Weil 已提交
934 935
	     req->r_osd ? req->r_osd->o_osd : -1);

936 937 938 939
	/* record full pg acting set */
	memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
	req->r_num_pg_osds = num;

S
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940 941 942 943 944 945 946 947
	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) {
948
		err = -ENOMEM;
949
		req->r_osd = create_osd(osdc, o);
950 951
		if (!req->r_osd) {
			list_move(&req->r_req_lru_item, &osdc->req_notarget);
952
			goto out;
953
		}
S
Sage Weil 已提交
954

955
		dout("map_request osd %p is osd%d\n", req->r_osd, o);
S
Sage Weil 已提交
956 957
		__insert_osd(osdc, req->r_osd);

958 959 960
		ceph_con_open(&req->r_osd->o_con,
			      CEPH_ENTITY_TYPE_OSD, o,
			      &osdc->osdmap->osd_addr[o]);
S
Sage Weil 已提交
961 962
	}

963 964
	if (req->r_osd) {
		__remove_osd_from_lru(req->r_osd);
S
Sage Weil 已提交
965
		list_add(&req->r_osd_item, &req->r_osd->o_requests);
966 967 968
		list_move(&req->r_req_lru_item, &osdc->req_unsent);
	} else {
		list_move(&req->r_req_lru_item, &osdc->req_notarget);
969
	}
970
	err = 1;   /* osd or pg changed */
S
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971 972 973 974 975 976 977 978

out:
	return err;
}

/*
 * caller should hold map_sem (for read) and request_mutex
 */
979 980
static void __send_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req)
S
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981 982 983 984 985 986 987 988 989 990 991
{
	struct ceph_osd_request_head *reqhead;

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

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

S
Sage Weil 已提交
992
	req->r_stamp = jiffies;
993
	list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
S
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994 995 996 997 998 999

	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;
}

1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
/*
 * Send any requests in the queue (req_unsent).
 */
static void send_queued(struct ceph_osd_client *osdc)
{
	struct ceph_osd_request *req, *tmp;

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

S
Sage Weil 已提交
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
/*
 * 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
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1028
	struct ceph_osd_request *req;
S
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1029
	struct ceph_osd *osd;
1030
	unsigned long keepalive =
1031
		osdc->client->options->osd_keepalive_timeout * HZ;
1032
	struct list_head slow_osds;
S
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1033 1034 1035 1036 1037 1038 1039
	dout("timeout\n");
	down_read(&osdc->map_sem);

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

	mutex_lock(&osdc->request_mutex);

1040 1041 1042 1043 1044 1045 1046
	/*
	 * ping osds that are a bit slow.  this ensures that if there
	 * is a break in the TCP connection we will notice, and reopen
	 * a connection with that osd (from the fault callback).
	 */
	INIT_LIST_HEAD(&slow_osds);
	list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
S
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1047
		if (time_before(jiffies, req->r_stamp + keepalive))
1048 1049 1050 1051 1052
			break;

		osd = req->r_osd;
		BUG_ON(!osd);
		dout(" tid %llu is slow, will send keepalive on osd%d\n",
S
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1053
		     req->r_tid, osd->o_osd);
1054 1055 1056 1057 1058 1059
		list_move_tail(&osd->o_keepalive_item, &slow_osds);
	}
	while (!list_empty(&slow_osds)) {
		osd = list_entry(slow_osds.next, struct ceph_osd,
				 o_keepalive_item);
		list_del_init(&osd->o_keepalive_item);
S
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1060 1061 1062
		ceph_con_keepalive(&osd->o_con);
	}

1063
	__schedule_osd_timeout(osdc);
S
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1064
	mutex_unlock(&osdc->request_mutex);
1065
	send_queued(osdc);
S
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1066 1067 1068
	up_read(&osdc->map_sem);
}

1069 1070 1071 1072 1073 1074
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 =
1075
		osdc->client->options->osd_idle_ttl * HZ >> 2;
1076 1077 1078

	dout("osds timeout\n");
	down_read(&osdc->map_sem);
1079
	remove_old_osds(osdc);
1080 1081 1082 1083 1084 1085
	up_read(&osdc->map_sem);

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

S
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1086 1087 1088 1089 1090 1091 1092
static void complete_request(struct ceph_osd_request *req)
{
	if (req->r_safe_callback)
		req->r_safe_callback(req, NULL);
	complete_all(&req->r_safe_completion);  /* fsync waiter */
}

S
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1093 1094 1095 1096
/*
 * handle osd op reply.  either call the callback if it is specified,
 * or do the completion to wake up the waiting thread.
 */
1097 1098
static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
			 struct ceph_connection *con)
S
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1099 1100 1101 1102 1103
{
	struct ceph_osd_reply_head *rhead = msg->front.iov_base;
	struct ceph_osd_request *req;
	u64 tid;
	int numops, object_len, flags;
1104
	s32 result;
S
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1105

1106
	tid = le64_to_cpu(msg->hdr.tid);
S
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1107 1108 1109 1110
	if (msg->front.iov_len < sizeof(*rhead))
		goto bad;
	numops = le32_to_cpu(rhead->num_ops);
	object_len = le32_to_cpu(rhead->object_len);
1111
	result = le32_to_cpu(rhead->result);
S
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1112 1113 1114
	if (msg->front.iov_len != sizeof(*rhead) + object_len +
	    numops * sizeof(struct ceph_osd_op))
		goto bad;
1115
	dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
S
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1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126
	/* lookup */
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (req == NULL) {
		dout("handle_reply tid %llu dne\n", tid);
		mutex_unlock(&osdc->request_mutex);
		return;
	}
	ceph_osdc_get_request(req);
	flags = le32_to_cpu(rhead->flags);

1127
	/*
1128
	 * if this connection filled our message, drop our reference now, to
1129 1130
	 * avoid a (safe but slower) revoke later.
	 */
1131
	if (req->r_con_filling_msg == con && req->r_reply == msg) {
S
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1132
		dout(" dropping con_filling_msg ref %p\n", con);
1133
		req->r_con_filling_msg = NULL;
1134
		con->ops->put(con);
1135 1136
	}

S
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1137
	if (!req->r_got_reply) {
1138
		unsigned int bytes;
S
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1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152

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

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

		req->r_got_reply = 1;
	} else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
		dout("handle_reply tid %llu dup ack\n", tid);
S
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1153
		mutex_unlock(&osdc->request_mutex);
S
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1154 1155 1156 1157 1158
		goto done;
	}

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

1159 1160 1161
	if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
		__register_linger_request(osdc, req);

S
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1162
	/* either this is a read, or we got the safe response */
1163 1164
	if (result < 0 ||
	    (flags & CEPH_OSD_FLAG_ONDISK) ||
S
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1165 1166 1167 1168 1169 1170 1171 1172
	    ((flags & CEPH_OSD_FLAG_WRITE) == 0))
		__unregister_request(osdc, req);

	mutex_unlock(&osdc->request_mutex);

	if (req->r_callback)
		req->r_callback(req, msg);
	else
1173
		complete_all(&req->r_completion);
S
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1174

S
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1175 1176
	if (flags & CEPH_OSD_FLAG_ONDISK)
		complete_request(req);
S
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1177 1178

done:
1179
	dout("req=%p req->r_linger=%d\n", req, req->r_linger);
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1180 1181 1182 1183 1184 1185 1186
	ceph_osdc_put_request(req);
	return;

bad:
	pr_err("corrupt osd_op_reply got %d %d expected %d\n",
	       (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
	       (int)sizeof(*rhead));
1187
	ceph_msg_dump(msg);
S
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1188 1189
}

1190
static void reset_changed_osds(struct ceph_osd_client *osdc)
S
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1191 1192 1193
{
	struct rb_node *p, *n;

1194 1195
	for (p = rb_first(&osdc->osds); p; p = n) {
		struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
S
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1196

1197 1198 1199 1200 1201 1202 1203
		n = rb_next(p);
		if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
		    memcmp(&osd->o_con.peer_addr,
			   ceph_osd_addr(osdc->osdmap,
					 osd->o_osd),
			   sizeof(struct ceph_entity_addr)) != 0)
			__reset_osd(osdc, osd);
S
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1204
	}
1205 1206 1207
}

/*
1208 1209
 * Requeue requests whose mapping to an OSD has changed.  If requests map to
 * no osd, request a new map.
1210
 *
1211
 * Caller should hold map_sem for read.
1212
 */
1213
static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1214
{
1215
	struct ceph_osd_request *req, *nreq;
1216 1217 1218
	struct rb_node *p;
	int needmap = 0;
	int err;
1219

1220
	dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1221
	mutex_lock(&osdc->request_mutex);
1222
	for (p = rb_first(&osdc->requests); p; ) {
1223
		req = rb_entry(p, struct ceph_osd_request, r_node);
1224
		p = rb_next(p);
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242

		/*
		 * 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;
		}

1243
		err = __map_request(osdc, req, force_resend);
1244 1245 1246 1247 1248 1249
		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) {
1250 1251 1252 1253
			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);
1254
				req->r_flags |= CEPH_OSD_FLAG_RETRY;
1255 1256
			}
		}
1257 1258 1259 1260 1261 1262
	}

	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);

1263
		err = __map_request(osdc, req, force_resend);
1264
		dout("__map_request returned %d\n", err);
1265 1266 1267 1268 1269 1270 1271 1272
		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;
1273
		}
1274 1275 1276 1277

		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);
1278
		__unregister_linger_request(osdc, req);
1279
	}
S
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1280 1281 1282 1283 1284 1285
	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);
	}
1286
	reset_changed_osds(osdc);
1287
}
1288 1289


S
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1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312
/*
 * 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));
1313 1314
	if (ceph_check_fsid(osdc->client, &fsid) < 0)
		return;
S
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1315 1316 1317 1318 1319 1320 1321 1322

	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);
1323 1324
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1325 1326 1327 1328 1329 1330 1331
		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,
1332
							  &osdc->client->msgr);
S
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1333 1334 1335 1336
			if (IS_ERR(newmap)) {
				err = PTR_ERR(newmap);
				goto bad;
			}
1337
			BUG_ON(!newmap);
S
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1338 1339 1340 1341
			if (newmap != osdc->osdmap) {
				ceph_osdmap_destroy(osdc->osdmap);
				osdc->osdmap = newmap;
			}
1342
			kick_requests(osdc, 0);
S
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1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357
		} 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);
1358 1359
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1360 1361 1362 1363 1364 1365 1366 1367 1368
		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 {
1369 1370
			int skipped_map = 0;

S
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1371 1372 1373 1374 1375 1376
			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;
			}
1377
			BUG_ON(!newmap);
S
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1378 1379
			oldmap = osdc->osdmap;
			osdc->osdmap = newmap;
1380 1381 1382
			if (oldmap) {
				if (oldmap->epoch + 1 < newmap->epoch)
					skipped_map = 1;
S
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1383
				ceph_osdmap_destroy(oldmap);
1384 1385
			}
			kick_requests(osdc, skipped_map);
S
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1386 1387 1388 1389 1390 1391 1392 1393
		}
		p += maplen;
		nr_maps--;
	}

done:
	downgrade_write(&osdc->map_sem);
	ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1394 1395 1396 1397 1398 1399 1400 1401 1402

	/*
	 * 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);

1403
	send_queued(osdc);
S
Sage Weil 已提交
1404
	up_read(&osdc->map_sem);
1405
	wake_up_all(&osdc->client->auth_wq);
S
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1406 1407 1408 1409
	return;

bad:
	pr_err("osdc handle_map corrupt msg\n");
1410
	ceph_msg_dump(msg);
S
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1411 1412 1413 1414
	up_write(&osdc->map_sem);
	return;
}

1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511
/*
 * watch/notify callback event infrastructure
 *
 * These callbacks are used both for watch and notify operations.
 */
static void __release_event(struct kref *kref)
{
	struct ceph_osd_event *event =
		container_of(kref, struct ceph_osd_event, kref);

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

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

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

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

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

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

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

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

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

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

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

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

	dout("create_event %p\n", event);
	event->cb = event_cb;
	event->one_shot = one_shot;
	event->data = data;
	event->osdc = osdc;
	INIT_LIST_HEAD(&event->osd_node);
1512
	RB_CLEAR_NODE(&event->node);
1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594
	kref_init(&event->kref);   /* one ref for us */
	kref_get(&event->kref);    /* one ref for the caller */
	init_completion(&event->completion);

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

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

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

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


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

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


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

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

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

	spin_lock(&osdc->event_lock);
	event = __find_event(osdc, cookie);
	if (event) {
		get_event(event);
		if (event->one_shot)
			__remove_event(event);
	}
	spin_unlock(&osdc->event_lock);
	dout("handle_watch_notify cookie %lld ver %lld event %p\n",
	     cookie, ver, event);
	if (event) {
		event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
		if (!event_work) {
			dout("ERROR: could not allocate event_work\n");
			goto done_err;
		}
1595
		INIT_WORK(&event_work->work, do_event_work);
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
		event_work->event = event;
		event_work->ver = ver;
		event_work->notify_id = notify_id;
		event_work->opcode = opcode;
		if (!queue_work(osdc->notify_wq, &event_work->work)) {
			dout("WARNING: failed to queue notify event work\n");
			goto done_err;
		}
	}

	return;

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

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

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

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

S
Sage Weil 已提交
1633 1634 1635 1636 1637 1638 1639
/*
 * Register request, send initial attempt.
 */
int ceph_osdc_start_request(struct ceph_osd_client *osdc,
			    struct ceph_osd_request *req,
			    bool nofail)
{
S
Sage Weil 已提交
1640
	int rc = 0;
S
Sage Weil 已提交
1641 1642 1643

	req->r_request->pages = req->r_pages;
	req->r_request->nr_pages = req->r_num_pages;
1644 1645 1646
#ifdef CONFIG_BLOCK
	req->r_request->bio = req->r_bio;
#endif
1647
	req->r_request->trail = &req->r_trail;
S
Sage Weil 已提交
1648 1649 1650 1651 1652

	register_request(osdc, req);

	down_read(&osdc->map_sem);
	mutex_lock(&osdc->request_mutex);
S
Sage Weil 已提交
1653 1654 1655 1656 1657 1658
	/*
	 * a racing kick_requests() may have sent the message for us
	 * while we dropped request_mutex above, so only send now if
	 * the request still han't been touched yet.
	 */
	if (req->r_sent == 0) {
1659
		rc = __map_request(osdc, req, 0);
1660 1661 1662 1663 1664 1665
		if (rc < 0) {
			if (nofail) {
				dout("osdc_start_request failed map, "
				     " will retry %lld\n", req->r_tid);
				rc = 0;
			}
1666
			goto out_unlock;
1667
		}
1668 1669 1670 1671
		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 {
1672
			__send_request(osdc, req);
S
Sage Weil 已提交
1673
		}
1674
		rc = 0;
S
Sage Weil 已提交
1675
	}
1676 1677

out_unlock:
S
Sage Weil 已提交
1678 1679 1680 1681
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
	return rc;
}
1682
EXPORT_SYMBOL(ceph_osdc_start_request);
S
Sage Weil 已提交
1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695

/*
 * 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);
1696
		__unregister_request(osdc, req);
S
Sage Weil 已提交
1697
		mutex_unlock(&osdc->request_mutex);
S
Sage Weil 已提交
1698
		complete_request(req);
1699
		dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
S
Sage Weil 已提交
1700 1701 1702 1703 1704 1705
		return rc;
	}

	dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
	return req->r_result;
}
1706
EXPORT_SYMBOL(ceph_osdc_wait_request);
S
Sage Weil 已提交
1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739

/*
 * 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);
}
1740
EXPORT_SYMBOL(ceph_osdc_sync);
S
Sage Weil 已提交
1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757

/*
 * 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;
1758
	INIT_LIST_HEAD(&osdc->osd_lru);
S
Sage Weil 已提交
1759
	osdc->requests = RB_ROOT;
1760
	INIT_LIST_HEAD(&osdc->req_lru);
1761 1762
	INIT_LIST_HEAD(&osdc->req_unsent);
	INIT_LIST_HEAD(&osdc->req_notarget);
1763
	INIT_LIST_HEAD(&osdc->req_linger);
S
Sage Weil 已提交
1764 1765
	osdc->num_requests = 0;
	INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1766
	INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1767 1768 1769
	spin_lock_init(&osdc->event_lock);
	osdc->event_tree = RB_ROOT;
	osdc->event_count = 0;
1770 1771

	schedule_delayed_work(&osdc->osds_timeout_work,
1772
	   round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
S
Sage Weil 已提交
1773

1774
	err = -ENOMEM;
S
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1775 1776 1777
	osdc->req_mempool = mempool_create_kmalloc_pool(10,
					sizeof(struct ceph_osd_request));
	if (!osdc->req_mempool)
1778
		goto out;
S
Sage Weil 已提交
1779

1780 1781
	err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
				OSD_OP_FRONT_LEN, 10, true,
1782
				"osd_op");
S
Sage Weil 已提交
1783
	if (err < 0)
1784
		goto out_mempool;
1785
	err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
1786 1787
				OSD_OPREPLY_FRONT_LEN, 10, true,
				"osd_op_reply");
S
Sage Weil 已提交
1788 1789
	if (err < 0)
		goto out_msgpool;
1790 1791 1792 1793 1794 1795 1796

	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
1797
	return 0;
1798

S
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1799 1800
out_msgpool:
	ceph_msgpool_destroy(&osdc->msgpool_op);
1801 1802 1803 1804
out_mempool:
	mempool_destroy(osdc->req_mempool);
out:
	return err;
S
Sage Weil 已提交
1805
}
1806
EXPORT_SYMBOL(ceph_osdc_init);
S
Sage Weil 已提交
1807 1808 1809

void ceph_osdc_stop(struct ceph_osd_client *osdc)
{
1810 1811
	flush_workqueue(osdc->notify_wq);
	destroy_workqueue(osdc->notify_wq);
S
Sage Weil 已提交
1812
	cancel_delayed_work_sync(&osdc->timeout_work);
1813
	cancel_delayed_work_sync(&osdc->osds_timeout_work);
S
Sage Weil 已提交
1814 1815 1816 1817
	if (osdc->osdmap) {
		ceph_osdmap_destroy(osdc->osdmap);
		osdc->osdmap = NULL;
	}
1818
	remove_all_osds(osdc);
S
Sage Weil 已提交
1819 1820
	mempool_destroy(osdc->req_mempool);
	ceph_msgpool_destroy(&osdc->msgpool_op);
S
Sage Weil 已提交
1821
	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
S
Sage Weil 已提交
1822
}
1823
EXPORT_SYMBOL(ceph_osdc_stop);
S
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1824 1825 1826 1827 1828 1829 1830 1831 1832

/*
 * 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,
1833
			struct page **pages, int num_pages, int page_align)
S
Sage Weil 已提交
1834 1835 1836 1837 1838 1839 1840 1841 1842
{
	struct ceph_osd_request *req;
	int rc = 0;

	dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
	     vino.snap, off, *plen);
	req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
				    CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
				    NULL, 0, truncate_seq, truncate_size, NULL,
1843
				    false, 1, page_align);
1844 1845
	if (IS_ERR(req))
		return PTR_ERR(req);
S
Sage Weil 已提交
1846 1847 1848 1849

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

1850 1851
	dout("readpages  final extent is %llu~%llu (%d pages align %d)\n",
	     off, *plen, req->r_num_pages, page_align);
S
Sage Weil 已提交
1852 1853 1854 1855 1856 1857 1858 1859 1860

	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;
}
1861
EXPORT_SYMBOL(ceph_osdc_readpages);
S
Sage Weil 已提交
1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876

/*
 * do a synchronous write on N pages
 */
int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
			 struct ceph_file_layout *layout,
			 struct ceph_snap_context *snapc,
			 u64 off, u64 len,
			 u32 truncate_seq, u64 truncate_size,
			 struct timespec *mtime,
			 struct page **pages, int num_pages,
			 int flags, int do_sync, bool nofail)
{
	struct ceph_osd_request *req;
	int rc = 0;
1877
	int page_align = off & ~PAGE_MASK;
S
Sage Weil 已提交
1878 1879 1880 1881 1882 1883 1884 1885

	BUG_ON(vino.snap != CEPH_NOSNAP);
	req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
				    CEPH_OSD_OP_WRITE,
				    flags | CEPH_OSD_FLAG_ONDISK |
					    CEPH_OSD_FLAG_WRITE,
				    snapc, do_sync,
				    truncate_seq, truncate_size, mtime,
1886
				    nofail, 1, page_align);
1887 1888
	if (IS_ERR(req))
		return PTR_ERR(req);
S
Sage Weil 已提交
1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904

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

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

	ceph_osdc_put_request(req);
	if (rc == 0)
		rc = len;
	dout("writepages result %d\n", rc);
	return rc;
}
1905
EXPORT_SYMBOL(ceph_osdc_writepages);
S
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1906 1907 1908 1909 1910 1911 1912

/*
 * handle incoming message
 */
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
{
	struct ceph_osd *osd = con->private;
1913
	struct ceph_osd_client *osdc;
S
Sage Weil 已提交
1914 1915 1916
	int type = le16_to_cpu(msg->hdr.type);

	if (!osd)
S
Sage Weil 已提交
1917
		goto out;
1918
	osdc = osd->o_osdc;
S
Sage Weil 已提交
1919 1920 1921 1922 1923 1924

	switch (type) {
	case CEPH_MSG_OSD_MAP:
		ceph_osdc_handle_map(osdc, msg);
		break;
	case CEPH_MSG_OSD_OPREPLY:
1925
		handle_reply(osdc, msg, con);
S
Sage Weil 已提交
1926
		break;
1927 1928 1929
	case CEPH_MSG_WATCH_NOTIFY:
		handle_watch_notify(osdc, msg);
		break;
S
Sage Weil 已提交
1930 1931 1932 1933 1934

	default:
		pr_err("received unknown message type %d %s\n", type,
		       ceph_msg_type_name(type));
	}
S
Sage Weil 已提交
1935
out:
S
Sage Weil 已提交
1936 1937 1938
	ceph_msg_put(msg);
}

1939
/*
1940 1941
 * lookup and return message for incoming reply.  set up reply message
 * pages.
1942 1943
 */
static struct ceph_msg *get_reply(struct ceph_connection *con,
1944 1945
				  struct ceph_msg_header *hdr,
				  int *skip)
S
Sage Weil 已提交
1946 1947 1948
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc = osd->o_osdc;
1949
	struct ceph_msg *m;
1950
	struct ceph_osd_request *req;
1951 1952
	int front = le32_to_cpu(hdr->front_len);
	int data_len = le32_to_cpu(hdr->data_len);
1953
	u64 tid;
S
Sage Weil 已提交
1954

1955 1956 1957 1958 1959 1960
	tid = le64_to_cpu(hdr->tid);
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (!req) {
		*skip = 1;
		m = NULL;
1961 1962
		dout("get_reply unknown tid %llu from osd%d\n", tid,
		     osd->o_osd);
1963 1964
		goto out;
	}
S
Sage Weil 已提交
1965 1966

	if (req->r_con_filling_msg) {
1967
		dout("%s revoking msg %p from old con %p\n", __func__,
S
Sage Weil 已提交
1968
		     req->r_reply, req->r_con_filling_msg);
1969
		ceph_msg_revoke_incoming(req->r_reply);
1970
		req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
1971
		req->r_con_filling_msg = NULL;
1972 1973
	}

S
Sage Weil 已提交
1974 1975 1976
	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);
1977
		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
1978
		if (!m)
S
Sage Weil 已提交
1979 1980 1981 1982 1983 1984
			goto out;
		ceph_msg_put(req->r_reply);
		req->r_reply = m;
	}
	m = ceph_msg_get(req->r_reply);

1985
	if (data_len > 0) {
1986
		int want = calc_pages_for(req->r_page_alignment, data_len);
1987 1988

		if (unlikely(req->r_num_pages < want)) {
1989 1990 1991
			pr_warning("tid %lld reply has %d bytes %d pages, we"
				   " had only %d pages ready\n", tid, data_len,
				   want, req->r_num_pages);
1992 1993
			*skip = 1;
			ceph_msg_put(m);
1994
			m = NULL;
1995
			goto out;
1996
		}
1997 1998
		m->pages = req->r_pages;
		m->nr_pages = req->r_num_pages;
1999
		m->page_alignment = req->r_page_alignment;
2000 2001 2002
#ifdef CONFIG_BLOCK
		m->bio = req->r_bio;
#endif
2003
	}
2004
	*skip = 0;
2005
	req->r_con_filling_msg = con->ops->get(con);
S
Sage Weil 已提交
2006
	dout("get_reply tid %lld %p\n", tid, m);
2007 2008 2009

out:
	mutex_unlock(&osdc->request_mutex);
2010
	return m;
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021

}

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
Alex Elder 已提交
2022
	*skip = 0;
2023 2024
	switch (type) {
	case CEPH_MSG_OSD_MAP:
2025
	case CEPH_MSG_WATCH_NOTIFY:
2026
		return ceph_msg_new(type, front, GFP_NOFS, false);
2027 2028 2029 2030 2031 2032 2033 2034
	case CEPH_MSG_OSD_OPREPLY:
		return get_reply(con, hdr, skip);
	default:
		pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
			osd->o_osd);
		*skip = 1;
		return NULL;
	}
S
Sage Weil 已提交
2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053
}

/*
 * 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);
}

2054 2055 2056
/*
 * authentication
 */
2057 2058 2059 2060 2061
/*
 * 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,
2062
					int *proto, int force_new)
2063 2064 2065 2066
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;
2067
	struct ceph_auth_handshake *auth = &o->o_auth;
2068

2069
	if (force_new && auth->authorizer) {
2070 2071
		if (ac->ops && ac->ops->destroy_authorizer)
			ac->ops->destroy_authorizer(ac, auth->authorizer);
2072 2073
		auth->authorizer = NULL;
	}
2074
	if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
2075 2076
		int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
							auth);
2077
		if (ret)
2078
			return ERR_PTR(ret);
2079 2080
	}
	*proto = ac->protocol;
2081

2082
	return auth;
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}


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;

2092 2093 2094 2095
	/*
	 * XXX If ac->ops or ac->ops->verify_authorizer_reply is null,
	 * XXX which do we do:  succeed or fail?
	 */
2096
	return ac->ops->verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2097 2098
}

2099 2100 2101 2102 2103 2104
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;

2105
	if (ac->ops && ac->ops->invalidate_authorizer)
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		ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);

	return ceph_monc_validate_auth(&osdc->client->monc);
}
2110

2111
static const struct ceph_connection_operations osd_con_ops = {
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	.get = get_osd_con,
	.put = put_osd_con,
	.dispatch = dispatch,
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	.get_authorizer = get_authorizer,
	.verify_authorizer_reply = verify_authorizer_reply,
2117
	.invalidate_authorizer = invalidate_authorizer,
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2118
	.alloc_msg = alloc_msg,
2119
	.fault = osd_reset,
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};