osd_client.c 55.6 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_needs_trail(int op)
{
	switch (op) {
	case CEPH_OSD_OP_GETXATTR:
	case CEPH_OSD_OP_SETXATTR:
	case CEPH_OSD_OP_CMPXATTR:
	case CEPH_OSD_OP_CALL:
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	case CEPH_OSD_OP_NOTIFY:
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		return 1;
	default:
		return 0;
	}
}

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

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int ceph_calc_raw_layout(struct ceph_osd_client *osdc,
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			struct ceph_file_layout *layout,
			u64 snapid,
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			u64 off, u64 *plen, u64 *bno,
			struct ceph_osd_request *req,
			struct ceph_osd_req_op *op)
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{
	struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
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	u64 orig_len = *plen;
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	u64 objoff, objlen;    /* extent in object */
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	int r;
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	reqhead->snapid = cpu_to_le64(snapid);

	/* object extent? */
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	r = ceph_calc_file_object_mapping(layout, off, plen, bno,
					  &objoff, &objlen);
	if (r < 0)
		return r;
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	if (*plen < orig_len)
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		dout(" skipping last %llu, final file extent %llu~%llu\n",
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		     orig_len - *plen, off, *plen);
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	if (op_has_extent(op->op)) {
		op->extent.offset = objoff;
		op->extent.length = objlen;
	}
	req->r_num_pages = calc_pages_for(off, *plen);
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	req->r_page_alignment = off & ~PAGE_MASK;
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	if (op->op == CEPH_OSD_OP_WRITE)
		op->payload_len = *plen;
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	dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
	     *bno, objoff, objlen, req->r_num_pages);
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	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_osd_client *osdc,
		       struct ceph_vino vino,
		       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(osdc, layout, vino.snap, off,
				 plen, &bno, req, op);
	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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	if (req->r_trail) {
		ceph_pagelist_release(req->r_trail);
		kfree(req->r_trail);
	}
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	if (req->r_mempool)
		mempool_free(req, req->r_osdc->req_mempool);
	else
		kfree(req);
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}
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EXPORT_SYMBOL(ceph_osdc_release_request);
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static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail)
{
	int i = 0;

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

	return i;
}

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

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

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	/* create reply message */
	if (use_mempool)
		msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
	else
		msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
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				   OSD_OPREPLY_FRONT_LEN, gfp_flags, 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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	/* allocate space for the trailing data */
	if (needs_trail) {
		req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
		if (!req->r_trail) {
			ceph_osdc_put_request(req);
			return NULL;
		}
		ceph_pagelist_init(req->r_trail);
	}
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	/* create request message; allow space for oid */
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	msg_size += 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;
	req->r_pages = pages;
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#ifdef CONFIG_BLOCK
	if (bio) {
		req->r_bio = bio;
		bio_get(req->r_bio);
	}
#endif
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	return req;
}
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EXPORT_SYMBOL(ceph_osdc_alloc_request);
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static void osd_req_encode_op(struct ceph_osd_request *req,
			      struct ceph_osd_op *dst,
			      struct ceph_osd_req_op *src)
{
	dst->op = cpu_to_le16(src->op);

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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:
		BUG_ON(!req->r_trail);

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

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

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

			BUG_ON(!req->r_trail);

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

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

	req->r_snapc = ceph_get_snap_context(snapc);

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


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

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

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

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

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	BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
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	msg_size = p - msg->front.iov_base;
	msg->front.iov_len = msg_size;
	msg->hdr.front_len = cpu_to_le32(msg_size);
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	return;
}
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EXPORT_SYMBOL(ceph_osdc_build_request);
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/*
 * build new request AND message, calculate layout, and adjust file
 * extent as needed.
 *
 * if the file was recently truncated, we include information about its
 * old and new size so that the object can be updated appropriately.  (we
 * avoid synchronously deleting truncated objects because it's slow.)
 *
 * if @do_sync, include a 'startsync' command so that the osd will flush
 * data quickly.
 */
struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
					       struct ceph_file_layout *layout,
					       struct ceph_vino vino,
					       u64 off, u64 *plen,
					       int opcode, int flags,
					       struct ceph_snap_context *snapc,
					       int do_sync,
					       u32 truncate_seq,
					       u64 truncate_size,
					       struct timespec *mtime,
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					       bool use_mempool, int num_reply,
					       int page_align)
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{
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	struct ceph_osd_req_op ops[3];
	struct ceph_osd_request *req;
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	int r;
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	ops[0].op = opcode;
	ops[0].extent.truncate_seq = truncate_seq;
	ops[0].extent.truncate_size = truncate_size;
	ops[0].payload_len = 0;

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

	req = ceph_osdc_alloc_request(osdc, flags,
					 snapc, ops,
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					 use_mempool,
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					 GFP_NOFS, NULL, NULL);
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	if (!req)
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		return ERR_PTR(-ENOMEM);
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	/* calculate max write size */
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	r = calc_layout(osdc, vino, layout, off, plen, req, ops);
	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, ops,
				snapc,
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				mtime,
				req->r_oid, req->r_oid_len);

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

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

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

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

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

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

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

573 574 575 576 577 578
/*
 * Resubmit requests pending on the given osd.
 */
static void __kick_osd_requests(struct ceph_osd_client *osdc,
				struct ceph_osd *osd)
{
579
	struct ceph_osd_request *req, *nreq;
580 581 582 583
	int err;

	dout("__kick_osd_requests osd%d\n", osd->o_osd);
	err = __reset_osd(osdc, osd);
584
	if (err)
585 586 587 588 589 590
		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);
591 592 593 594 595 596
		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) {
597 598 599 600 601
		/*
		 * reregister request prior to unregistering linger so
		 * that r_osd is preserved.
		 */
		BUG_ON(!list_empty(&req->r_req_lru_item));
602
		__register_request(osdc, req);
603 604 605
		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);
606 607
		dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
		     osd->o_osd);
608 609 610
	}
}

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611
/*
612
 * If the osd connection drops, we need to resubmit all requests.
S
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613 614 615 616 617 618 619 620 621 622 623
 */
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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624 625 626
	mutex_lock(&osdc->request_mutex);
	__kick_osd_requests(osdc, osd);
	mutex_unlock(&osdc->request_mutex);
627
	send_queued(osdc);
S
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628 629 630 631 632 633
	up_read(&osdc->map_sem);
}

/*
 * Track open sessions with osds.
 */
634
static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
S
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635 636 637 638 639 640 641 642 643
{
	struct ceph_osd *osd;

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

	atomic_set(&osd->o_ref, 1);
	osd->o_osdc = osdc;
644
	osd->o_osd = onum;
645
	RB_CLEAR_NODE(&osd->o_node);
S
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646
	INIT_LIST_HEAD(&osd->o_requests);
647
	INIT_LIST_HEAD(&osd->o_linger_requests);
648
	INIT_LIST_HEAD(&osd->o_osd_lru);
S
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649 650
	osd->o_incarnation = 1;

651
	ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
652

653
	INIT_LIST_HEAD(&osd->o_keepalive_item);
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654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672
	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);
673
	if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
S
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674 675
		struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;

676
		if (ac->ops && ac->ops->destroy_authorizer)
677
			ac->ops->destroy_authorizer(ac, osd->o_auth.authorizer);
S
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678
		kfree(osd);
S
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679
	}
S
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680 681 682 683 684
}

/*
 * remove an osd from our map
 */
685
static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
S
Sage Weil 已提交
686
{
687
	dout("__remove_osd %p\n", osd);
S
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688 689
	BUG_ON(!list_empty(&osd->o_requests));
	rb_erase(&osd->o_node, &osdc->osds);
690
	list_del_init(&osd->o_osd_lru);
S
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691 692 693 694
	ceph_con_close(&osd->o_con);
	put_osd(osd);
}

695 696
static void remove_all_osds(struct ceph_osd_client *osdc)
{
697
	dout("%s %p\n", __func__, osdc);
698 699 700 701 702 703 704 705 706
	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);
}

707 708 709 710 711 712
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);
713
	osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
714 715 716 717 718 719 720 721 722
}

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);
}

723
static void remove_old_osds(struct ceph_osd_client *osdc)
724 725 726 727 728 729
{
	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) {
730
		if (time_before(jiffies, osd->lru_ttl))
731 732 733 734 735 736
			break;
		__remove_osd(osdc, osd);
	}
	mutex_unlock(&osdc->request_mutex);
}

S
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737 738 739
/*
 * reset osd connect
 */
740
static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
S
Sage Weil 已提交
741
{
742
	struct ceph_osd_request *req;
S
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743 744
	int ret = 0;

745
	dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
746 747
	if (list_empty(&osd->o_requests) &&
	    list_empty(&osd->o_linger_requests)) {
748
		__remove_osd(osdc, osd);
749
		ret = -ENODEV;
750 751 752 753 754 755 756 757 758 759
	} else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
			  &osd->o_con.peer_addr,
			  sizeof(osd->o_con.peer_addr)) == 0 &&
		   !ceph_con_opened(&osd->o_con)) {
		dout(" osd addr hasn't changed and connection never opened,"
		     " letting msgr retry");
		/* touch each r_stamp for handle_timeout()'s benfit */
		list_for_each_entry(req, &osd->o_requests, r_osd_item)
			req->r_stamp = jiffies;
		ret = -EAGAIN;
S
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760 761
	} else {
		ceph_con_close(&osd->o_con);
762 763
		ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd,
			      &osdc->osdmap->osd_addr[osd->o_osd]);
S
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764 765 766 767 768 769 770 771 772 773 774
		osd->o_incarnation++;
	}
	return ret;
}

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

775
	dout("__insert_osd %p osd%d\n", new, new->o_osd);
S
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776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
	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;
}

808 809 810
static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
{
	schedule_delayed_work(&osdc->timeout_work,
811
			osdc->client->options->osd_keepalive_timeout * HZ);
812 813 814 815 816 817
}

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.
 */
823 824
static void __register_request(struct ceph_osd_client *osdc,
			       struct ceph_osd_request *req)
S
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825 826
{
	req->r_tid = ++osdc->last_tid;
827
	req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
828
	dout("__register_request %p tid %lld\n", req, req->r_tid);
S
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829 830 831 832
	__insert_request(osdc, req);
	ceph_osdc_get_request(req);
	osdc->num_requests++;
	if (osdc->num_requests == 1) {
833 834
		dout(" first request, scheduling timeout\n");
		__schedule_osd_timeout(osdc);
S
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835
	}
836 837 838 839 840 841 842
}

static void register_request(struct ceph_osd_client *osdc,
			     struct ceph_osd_request *req)
{
	mutex_lock(&osdc->request_mutex);
	__register_request(osdc, req);
S
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843 844 845 846 847 848 849 850 851
	mutex_unlock(&osdc->request_mutex);
}

/*
 * called under osdc->request_mutex
 */
static void __unregister_request(struct ceph_osd_client *osdc,
				 struct ceph_osd_request *req)
{
852 853 854 855 856 857
	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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858 859 860 861
	dout("__unregister_request %p tid %lld\n", req, req->r_tid);
	rb_erase(&req->r_node, &osdc->requests);
	osdc->num_requests--;

862 863
	if (req->r_osd) {
		/* make sure the original request isn't in flight. */
864
		ceph_msg_revoke(req->r_request);
865 866

		list_del_init(&req->r_osd_item);
867 868 869
		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);
870
			__move_osd_to_lru(osdc, req->r_osd);
871
		}
872
		if (list_empty(&req->r_linger_item))
873
			req->r_osd = NULL;
874
	}
S
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875

A
Alex Elder 已提交
876
	list_del_init(&req->r_req_lru_item);
S
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877 878
	ceph_osdc_put_request(req);

879 880 881
	if (osdc->num_requests == 0) {
		dout(" no requests, canceling timeout\n");
		__cancel_osd_timeout(osdc);
S
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882 883 884 885 886 887 888 889
	}
}

/*
 * Cancel a previously queued request message
 */
static void __cancel_request(struct ceph_osd_request *req)
{
890
	if (req->r_sent && req->r_osd) {
891
		ceph_msg_revoke(req->r_request);
S
Sage Weil 已提交
892 893 894 895
		req->r_sent = 0;
	}
}

896 897 898 899 900
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);
901 902 903
	if (req->r_osd)
		list_add_tail(&req->r_linger_osd,
			      &req->r_osd->o_linger_requests);
904 905 906 907 908 909
}

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
910
	list_del_init(&req->r_linger_item);
911 912 913 914 915 916 917 918
	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);
		}
919 920
		if (list_empty(&req->r_osd_item))
			req->r_osd = NULL;
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950
	}
}

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
Sage Weil 已提交
951 952 953
/*
 * 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
954
 * no up osd, set r_osd to NULL.  Move the request to the appropriate list
955
 * (unsent, homeless) or leave on in-flight lru.
S
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956 957 958 959 960
 *
 * Return 0 if unchanged, 1 if changed, or negative on error.
 *
 * Caller should hold map_sem for read and request_mutex.
 */
961
static int __map_request(struct ceph_osd_client *osdc,
962
			 struct ceph_osd_request *req, int force_resend)
S
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963 964
{
	struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
965
	struct ceph_pg pgid;
966 967
	int acting[CEPH_PG_MAX_SIZE];
	int o = -1, num = 0;
S
Sage Weil 已提交
968 969
	int err;

970
	dout("map_request %p tid %lld\n", req, req->r_tid);
S
Sage Weil 已提交
971 972
	err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
				      &req->r_file_layout, osdc->osdmap);
973 974
	if (err) {
		list_move(&req->r_req_lru_item, &osdc->req_notarget);
S
Sage Weil 已提交
975
		return err;
976
	}
977
	pgid = reqhead->layout.ol_pgid;
978 979
	req->r_pgid = pgid;

980 981 982 983 984
	err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
	if (err > 0) {
		o = acting[0];
		num = err;
	}
S
Sage Weil 已提交
985

986 987
	if ((!force_resend &&
	     req->r_osd && req->r_osd->o_osd == o &&
988 989 990
	     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
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991 992 993
	    (req->r_osd == NULL && o == -1))
		return 0;  /* no change */

994
	dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
995
	     req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
S
Sage Weil 已提交
996 997
	     req->r_osd ? req->r_osd->o_osd : -1);

998 999 1000 1001
	/* 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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1002 1003 1004 1005 1006 1007 1008 1009
	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) {
1010
		err = -ENOMEM;
1011
		req->r_osd = create_osd(osdc, o);
1012 1013
		if (!req->r_osd) {
			list_move(&req->r_req_lru_item, &osdc->req_notarget);
1014
			goto out;
1015
		}
S
Sage Weil 已提交
1016

1017
		dout("map_request osd %p is osd%d\n", req->r_osd, o);
S
Sage Weil 已提交
1018 1019
		__insert_osd(osdc, req->r_osd);

1020 1021 1022
		ceph_con_open(&req->r_osd->o_con,
			      CEPH_ENTITY_TYPE_OSD, o,
			      &osdc->osdmap->osd_addr[o]);
S
Sage Weil 已提交
1023 1024
	}

1025 1026
	if (req->r_osd) {
		__remove_osd_from_lru(req->r_osd);
S
Sage Weil 已提交
1027
		list_add(&req->r_osd_item, &req->r_osd->o_requests);
1028 1029 1030
		list_move(&req->r_req_lru_item, &osdc->req_unsent);
	} else {
		list_move(&req->r_req_lru_item, &osdc->req_notarget);
1031
	}
1032
	err = 1;   /* osd or pg changed */
S
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1033 1034 1035 1036 1037 1038 1039 1040

out:
	return err;
}

/*
 * caller should hold map_sem (for read) and request_mutex
 */
1041 1042
static void __send_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req)
S
Sage Weil 已提交
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
{
	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
1054
	req->r_stamp = jiffies;
1055
	list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
S
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1056 1057 1058 1059 1060 1061

	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;
}

1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
/*
 * 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
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1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
/*
 * 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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1090
	struct ceph_osd_request *req;
S
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1091
	struct ceph_osd *osd;
1092
	unsigned long keepalive =
1093
		osdc->client->options->osd_keepalive_timeout * HZ;
1094
	struct list_head slow_osds;
S
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1095 1096 1097 1098 1099 1100 1101
	dout("timeout\n");
	down_read(&osdc->map_sem);

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

	mutex_lock(&osdc->request_mutex);

1102 1103 1104 1105 1106 1107 1108
	/*
	 * 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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1109
		if (time_before(jiffies, req->r_stamp + keepalive))
1110 1111 1112 1113 1114
			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
1115
		     req->r_tid, osd->o_osd);
1116 1117 1118 1119 1120 1121
		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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1122 1123 1124
		ceph_con_keepalive(&osd->o_con);
	}

1125
	__schedule_osd_timeout(osdc);
S
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1126
	mutex_unlock(&osdc->request_mutex);
1127
	send_queued(osdc);
S
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1128 1129 1130
	up_read(&osdc->map_sem);
}

1131 1132 1133 1134 1135 1136
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 =
1137
		osdc->client->options->osd_idle_ttl * HZ >> 2;
1138 1139 1140

	dout("osds timeout\n");
	down_read(&osdc->map_sem);
1141
	remove_old_osds(osdc);
1142 1143 1144 1145 1146 1147
	up_read(&osdc->map_sem);

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

S
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1148 1149 1150 1151 1152 1153 1154
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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1155 1156 1157 1158
/*
 * handle osd op reply.  either call the callback if it is specified,
 * or do the completion to wake up the waiting thread.
 */
1159 1160
static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
			 struct ceph_connection *con)
S
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1161 1162 1163 1164 1165
{
	struct ceph_osd_reply_head *rhead = msg->front.iov_base;
	struct ceph_osd_request *req;
	u64 tid;
	int numops, object_len, flags;
1166
	s32 result;
S
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1167

1168
	tid = le64_to_cpu(msg->hdr.tid);
S
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1169 1170 1171 1172
	if (msg->front.iov_len < sizeof(*rhead))
		goto bad;
	numops = le32_to_cpu(rhead->num_ops);
	object_len = le32_to_cpu(rhead->object_len);
1173
	result = le32_to_cpu(rhead->result);
S
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1174 1175 1176
	if (msg->front.iov_len != sizeof(*rhead) + object_len +
	    numops * sizeof(struct ceph_osd_op))
		goto bad;
1177
	dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
S
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1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
	/* 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);

1189
	/*
1190
	 * if this connection filled our message, drop our reference now, to
1191 1192
	 * avoid a (safe but slower) revoke later.
	 */
1193
	if (req->r_con_filling_msg == con && req->r_reply == msg) {
S
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1194
		dout(" dropping con_filling_msg ref %p\n", con);
1195
		req->r_con_filling_msg = NULL;
1196
		con->ops->put(con);
1197 1198
	}

S
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1199
	if (!req->r_got_reply) {
1200
		unsigned int bytes;
S
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1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214

		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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1215
		mutex_unlock(&osdc->request_mutex);
S
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1216 1217 1218 1219 1220
		goto done;
	}

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

1221 1222 1223
	if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
		__register_linger_request(osdc, req);

S
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1224
	/* either this is a read, or we got the safe response */
1225 1226
	if (result < 0 ||
	    (flags & CEPH_OSD_FLAG_ONDISK) ||
S
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1227 1228 1229 1230 1231 1232 1233 1234
	    ((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
1235
		complete_all(&req->r_completion);
S
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1236

S
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1237 1238
	if (flags & CEPH_OSD_FLAG_ONDISK)
		complete_request(req);
S
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1239 1240

done:
1241
	dout("req=%p req->r_linger=%d\n", req, req->r_linger);
S
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1242 1243 1244 1245 1246 1247 1248
	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));
1249
	ceph_msg_dump(msg);
S
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1250 1251
}

1252
static void reset_changed_osds(struct ceph_osd_client *osdc)
S
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1253 1254 1255
{
	struct rb_node *p, *n;

1256 1257
	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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1258

1259 1260 1261 1262 1263 1264 1265
		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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1266
	}
1267 1268 1269
}

/*
1270 1271
 * Requeue requests whose mapping to an OSD has changed.  If requests map to
 * no osd, request a new map.
1272 1273 1274
 *
 * Caller should hold map_sem for read and request_mutex.
 */
1275
static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1276
{
1277
	struct ceph_osd_request *req, *nreq;
1278 1279 1280
	struct rb_node *p;
	int needmap = 0;
	int err;
1281

1282
	dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1283
	mutex_lock(&osdc->request_mutex);
1284
	for (p = rb_first(&osdc->requests); p; ) {
1285
		req = rb_entry(p, struct ceph_osd_request, r_node);
1286
		p = rb_next(p);
1287
		err = __map_request(osdc, req, force_resend);
1288 1289 1290 1291 1292 1293
		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) {
1294 1295 1296 1297
			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);
1298
				req->r_flags |= CEPH_OSD_FLAG_RETRY;
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310
			}
		}
		if (req->r_linger && list_empty(&req->r_linger_item)) {
			/*
			 * register as a linger so that we will
			 * re-submit below and get a new tid
			 */
			dout("%p tid %llu restart on osd%d\n",
			     req, req->r_tid,
			     req->r_osd ? req->r_osd->o_osd : -1);
			__register_linger_request(osdc, req);
			__unregister_request(osdc, req);
1311 1312 1313 1314 1315 1316 1317
		}
	}

	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);

1318
		err = __map_request(osdc, req, force_resend);
1319 1320 1321 1322 1323 1324 1325 1326
		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;
1327
		}
1328 1329 1330 1331

		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);
1332
		__unregister_linger_request(osdc, req);
1333
	}
S
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1334 1335 1336 1337 1338 1339
	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);
	}
1340
}
1341 1342


S
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1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365
/*
 * 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));
1366 1367
	if (ceph_check_fsid(osdc->client, &fsid) < 0)
		return;
S
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1368 1369 1370 1371 1372 1373 1374 1375

	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);
1376 1377
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1378 1379 1380 1381 1382 1383 1384
		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,
1385
							  &osdc->client->msgr);
S
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1386 1387 1388 1389
			if (IS_ERR(newmap)) {
				err = PTR_ERR(newmap);
				goto bad;
			}
1390
			BUG_ON(!newmap);
S
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1391 1392 1393 1394
			if (newmap != osdc->osdmap) {
				ceph_osdmap_destroy(osdc->osdmap);
				osdc->osdmap = newmap;
			}
1395
			kick_requests(osdc, 0);
1396
			reset_changed_osds(osdc);
S
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1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411
		} 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);
1412 1413
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1414 1415 1416 1417 1418 1419 1420 1421 1422
		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 {
1423 1424
			int skipped_map = 0;

S
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1425 1426 1427 1428 1429 1430
			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;
			}
1431
			BUG_ON(!newmap);
S
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1432 1433
			oldmap = osdc->osdmap;
			osdc->osdmap = newmap;
1434 1435 1436
			if (oldmap) {
				if (oldmap->epoch + 1 < newmap->epoch)
					skipped_map = 1;
S
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1437
				ceph_osdmap_destroy(oldmap);
1438 1439
			}
			kick_requests(osdc, skipped_map);
S
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1440 1441 1442 1443 1444 1445 1446 1447
		}
		p += maplen;
		nr_maps--;
	}

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

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

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

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

1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565
/*
 * 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);
1566
	RB_CLEAR_NODE(&event->node);
1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648
	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;
		}
1649
		INIT_WORK(&event_work->work, do_event_work);
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
		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
1687 1688 1689 1690 1691 1692 1693
/*
 * 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
1694
	int rc = 0;
S
Sage Weil 已提交
1695 1696 1697

	req->r_request->pages = req->r_pages;
	req->r_request->nr_pages = req->r_num_pages;
1698 1699 1700 1701
#ifdef CONFIG_BLOCK
	req->r_request->bio = req->r_bio;
#endif
	req->r_request->trail = req->r_trail;
S
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1702 1703 1704 1705 1706

	register_request(osdc, req);

	down_read(&osdc->map_sem);
	mutex_lock(&osdc->request_mutex);
S
Sage Weil 已提交
1707 1708 1709 1710 1711 1712
	/*
	 * 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) {
1713
		rc = __map_request(osdc, req, 0);
1714 1715 1716 1717 1718 1719
		if (rc < 0) {
			if (nofail) {
				dout("osdc_start_request failed map, "
				     " will retry %lld\n", req->r_tid);
				rc = 0;
			}
1720
			goto out_unlock;
1721
		}
1722 1723 1724 1725
		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 {
1726
			__send_request(osdc, req);
S
Sage Weil 已提交
1727
		}
1728
		rc = 0;
S
Sage Weil 已提交
1729
	}
1730 1731

out_unlock:
S
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1732 1733 1734 1735
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
	return rc;
}
1736
EXPORT_SYMBOL(ceph_osdc_start_request);
S
Sage Weil 已提交
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749

/*
 * 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);
1750
		__unregister_request(osdc, req);
S
Sage Weil 已提交
1751
		mutex_unlock(&osdc->request_mutex);
S
Sage Weil 已提交
1752
		complete_request(req);
1753
		dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
S
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1754 1755 1756 1757 1758 1759
		return rc;
	}

	dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
	return req->r_result;
}
1760
EXPORT_SYMBOL(ceph_osdc_wait_request);
S
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1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793

/*
 * 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);
}
1794
EXPORT_SYMBOL(ceph_osdc_sync);
S
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1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811

/*
 * 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;
1812
	INIT_LIST_HEAD(&osdc->osd_lru);
S
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1813
	osdc->requests = RB_ROOT;
1814
	INIT_LIST_HEAD(&osdc->req_lru);
1815 1816
	INIT_LIST_HEAD(&osdc->req_unsent);
	INIT_LIST_HEAD(&osdc->req_notarget);
1817
	INIT_LIST_HEAD(&osdc->req_linger);
S
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1818 1819
	osdc->num_requests = 0;
	INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1820
	INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1821 1822 1823
	spin_lock_init(&osdc->event_lock);
	osdc->event_tree = RB_ROOT;
	osdc->event_count = 0;
1824 1825

	schedule_delayed_work(&osdc->osds_timeout_work,
1826
	   round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
S
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1827

1828
	err = -ENOMEM;
S
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1829 1830 1831
	osdc->req_mempool = mempool_create_kmalloc_pool(10,
					sizeof(struct ceph_osd_request));
	if (!osdc->req_mempool)
1832
		goto out;
S
Sage Weil 已提交
1833

1834 1835
	err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
				OSD_OP_FRONT_LEN, 10, true,
1836
				"osd_op");
S
Sage Weil 已提交
1837
	if (err < 0)
1838
		goto out_mempool;
1839
	err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
1840 1841
				OSD_OPREPLY_FRONT_LEN, 10, true,
				"osd_op_reply");
S
Sage Weil 已提交
1842 1843
	if (err < 0)
		goto out_msgpool;
1844 1845 1846 1847 1848 1849 1850

	osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
	if (IS_ERR(osdc->notify_wq)) {
		err = PTR_ERR(osdc->notify_wq);
		osdc->notify_wq = NULL;
		goto out_msgpool;
	}
S
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1851
	return 0;
1852

S
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1853 1854
out_msgpool:
	ceph_msgpool_destroy(&osdc->msgpool_op);
1855 1856 1857 1858
out_mempool:
	mempool_destroy(osdc->req_mempool);
out:
	return err;
S
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1859
}
1860
EXPORT_SYMBOL(ceph_osdc_init);
S
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1861 1862 1863

void ceph_osdc_stop(struct ceph_osd_client *osdc)
{
1864 1865
	flush_workqueue(osdc->notify_wq);
	destroy_workqueue(osdc->notify_wq);
S
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1866
	cancel_delayed_work_sync(&osdc->timeout_work);
1867
	cancel_delayed_work_sync(&osdc->osds_timeout_work);
S
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1868 1869 1870 1871
	if (osdc->osdmap) {
		ceph_osdmap_destroy(osdc->osdmap);
		osdc->osdmap = NULL;
	}
1872
	remove_all_osds(osdc);
S
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1873 1874
	mempool_destroy(osdc->req_mempool);
	ceph_msgpool_destroy(&osdc->msgpool_op);
S
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1875
	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
S
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1876
}
1877
EXPORT_SYMBOL(ceph_osdc_stop);
S
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1878 1879 1880 1881 1882 1883 1884 1885 1886

/*
 * 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,
1887
			struct page **pages, int num_pages, int page_align)
S
Sage Weil 已提交
1888 1889 1890 1891 1892 1893 1894 1895 1896
{
	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,
1897
				    false, 1, page_align);
1898 1899
	if (IS_ERR(req))
		return PTR_ERR(req);
S
Sage Weil 已提交
1900 1901 1902 1903

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

1904 1905
	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
1906 1907 1908 1909 1910 1911 1912 1913 1914

	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;
}
1915
EXPORT_SYMBOL(ceph_osdc_readpages);
S
Sage Weil 已提交
1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930

/*
 * 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;
1931
	int page_align = off & ~PAGE_MASK;
S
Sage Weil 已提交
1932 1933 1934 1935 1936 1937 1938 1939

	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,
1940
				    nofail, 1, page_align);
1941 1942
	if (IS_ERR(req))
		return PTR_ERR(req);
S
Sage Weil 已提交
1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958

	/* 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;
}
1959
EXPORT_SYMBOL(ceph_osdc_writepages);
S
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1960 1961 1962 1963 1964 1965 1966

/*
 * handle incoming message
 */
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
{
	struct ceph_osd *osd = con->private;
1967
	struct ceph_osd_client *osdc;
S
Sage Weil 已提交
1968 1969 1970
	int type = le16_to_cpu(msg->hdr.type);

	if (!osd)
S
Sage Weil 已提交
1971
		goto out;
1972
	osdc = osd->o_osdc;
S
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1973 1974 1975 1976 1977 1978

	switch (type) {
	case CEPH_MSG_OSD_MAP:
		ceph_osdc_handle_map(osdc, msg);
		break;
	case CEPH_MSG_OSD_OPREPLY:
1979
		handle_reply(osdc, msg, con);
S
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1980
		break;
1981 1982 1983
	case CEPH_MSG_WATCH_NOTIFY:
		handle_watch_notify(osdc, msg);
		break;
S
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1984 1985 1986 1987 1988

	default:
		pr_err("received unknown message type %d %s\n", type,
		       ceph_msg_type_name(type));
	}
S
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1989
out:
S
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1990 1991 1992
	ceph_msg_put(msg);
}

1993
/*
1994 1995
 * lookup and return message for incoming reply.  set up reply message
 * pages.
1996 1997
 */
static struct ceph_msg *get_reply(struct ceph_connection *con,
1998 1999
				  struct ceph_msg_header *hdr,
				  int *skip)
S
Sage Weil 已提交
2000 2001 2002
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc = osd->o_osdc;
2003
	struct ceph_msg *m;
2004
	struct ceph_osd_request *req;
2005 2006
	int front = le32_to_cpu(hdr->front_len);
	int data_len = le32_to_cpu(hdr->data_len);
2007
	u64 tid;
S
Sage Weil 已提交
2008

2009 2010 2011 2012 2013 2014
	tid = le64_to_cpu(hdr->tid);
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (!req) {
		*skip = 1;
		m = NULL;
2015 2016
		dout("get_reply unknown tid %llu from osd%d\n", tid,
		     osd->o_osd);
2017 2018
		goto out;
	}
S
Sage Weil 已提交
2019 2020

	if (req->r_con_filling_msg) {
2021
		dout("%s revoking msg %p from old con %p\n", __func__,
S
Sage Weil 已提交
2022
		     req->r_reply, req->r_con_filling_msg);
2023
		ceph_msg_revoke_incoming(req->r_reply);
2024
		req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
2025
		req->r_con_filling_msg = NULL;
2026 2027
	}

S
Sage Weil 已提交
2028 2029 2030
	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);
2031
		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2032
		if (!m)
S
Sage Weil 已提交
2033 2034 2035 2036 2037 2038
			goto out;
		ceph_msg_put(req->r_reply);
		req->r_reply = m;
	}
	m = ceph_msg_get(req->r_reply);

2039
	if (data_len > 0) {
2040
		int want = calc_pages_for(req->r_page_alignment, data_len);
2041 2042

		if (unlikely(req->r_num_pages < want)) {
2043 2044 2045
			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);
2046 2047
			*skip = 1;
			ceph_msg_put(m);
2048
			m = NULL;
2049
			goto out;
2050
		}
2051 2052
		m->pages = req->r_pages;
		m->nr_pages = req->r_num_pages;
2053
		m->page_alignment = req->r_page_alignment;
2054 2055 2056
#ifdef CONFIG_BLOCK
		m->bio = req->r_bio;
#endif
2057
	}
2058
	*skip = 0;
2059
	req->r_con_filling_msg = con->ops->get(con);
S
Sage Weil 已提交
2060
	dout("get_reply tid %lld %p\n", tid, m);
2061 2062 2063

out:
	mutex_unlock(&osdc->request_mutex);
2064
	return m;
2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075

}

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
2076
	*skip = 0;
2077 2078
	switch (type) {
	case CEPH_MSG_OSD_MAP:
2079
	case CEPH_MSG_WATCH_NOTIFY:
2080
		return ceph_msg_new(type, front, GFP_NOFS, false);
2081 2082 2083 2084 2085 2086 2087 2088
	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
2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107
}

/*
 * 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);
}

2108 2109 2110
/*
 * authentication
 */
2111 2112 2113 2114 2115
/*
 * 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,
2116
					int *proto, int force_new)
2117 2118 2119 2120
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;
2121
	struct ceph_auth_handshake *auth = &o->o_auth;
2122

2123
	if (force_new && auth->authorizer) {
2124 2125
		if (ac->ops && ac->ops->destroy_authorizer)
			ac->ops->destroy_authorizer(ac, auth->authorizer);
2126 2127
		auth->authorizer = NULL;
	}
2128
	if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
2129 2130
		int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
							auth);
2131
		if (ret)
2132
			return ERR_PTR(ret);
2133 2134
	}
	*proto = ac->protocol;
2135

2136
	return auth;
2137 2138 2139 2140 2141 2142 2143 2144 2145
}


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;

2146 2147 2148 2149
	/*
	 * XXX If ac->ops or ac->ops->verify_authorizer_reply is null,
	 * XXX which do we do:  succeed or fail?
	 */
2150
	return ac->ops->verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2151 2152
}

2153 2154 2155 2156 2157 2158
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;

2159
	if (ac->ops && ac->ops->invalidate_authorizer)
2160 2161 2162 2163
		ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);

	return ceph_monc_validate_auth(&osdc->client->monc);
}
2164

2165
static const struct ceph_connection_operations osd_con_ops = {
S
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	.get = get_osd_con,
	.put = put_osd_con,
	.dispatch = dispatch,
2169 2170
	.get_authorizer = get_authorizer,
	.verify_authorizer_reply = verify_authorizer_reply,
2171
	.invalidate_authorizer = invalidate_authorizer,
S
Sage Weil 已提交
2172
	.alloc_msg = alloc_msg,
2173
	.fault = osd_reset,
S
Sage Weil 已提交
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};