osd_client.c 56.1 KB
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#include <linux/ceph/ceph_debug.h>
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#include <linux/module.h>
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#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
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#ifdef CONFIG_BLOCK
#include <linux/bio.h>
#endif
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#include <linux/ceph/libceph.h>
#include <linux/ceph/osd_client.h>
#include <linux/ceph/messenger.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/auth.h>
#include <linux/ceph/pagelist.h>
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#define OSD_OP_FRONT_LEN	4096
#define OSD_OPREPLY_FRONT_LEN	512
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static const struct ceph_connection_operations osd_con_ops;
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static void send_queued(struct ceph_osd_client *osdc);
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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void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
			struct ceph_file_layout *layout,
			u64 snapid,
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			u64 off, u64 *plen, u64 *bno,
			struct ceph_osd_request *req,
			struct ceph_osd_req_op *op)
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{
	struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
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	u64 orig_len = *plen;
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	u64 objoff, objlen;    /* extent in object */

	reqhead->snapid = cpu_to_le64(snapid);

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

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

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

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

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

	if (req->r_request)
		ceph_msg_put(req->r_request);
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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_init_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;

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

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

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

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

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

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

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

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

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

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

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

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

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/*
 * Resubmit requests pending on the given osd.
 */
static void __kick_osd_requests(struct ceph_osd_client *osdc,
				struct ceph_osd *osd)
{
568
	struct ceph_osd_request *req, *nreq;
569 570 571 572 573 574 575 576 577 578 579
	int err;

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

	list_for_each_entry(req, &osd->o_requests, r_osd_item) {
		list_move(&req->r_req_lru_item, &osdc->req_unsent);
		dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
		     osd->o_osd);
580 581 582 583 584 585
		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) {
586 587 588 589 590
		/*
		 * reregister request prior to unregistering linger so
		 * that r_osd is preserved.
		 */
		BUG_ON(!list_empty(&req->r_req_lru_item));
591
		__register_request(osdc, req);
592 593 594
		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);
595 596
		dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
		     osd->o_osd);
597 598 599 600 601 602 603 604 605 606
	}
}

static void kick_osd_requests(struct ceph_osd_client *osdc,
			      struct ceph_osd *kickosd)
{
	mutex_lock(&osdc->request_mutex);
	__kick_osd_requests(osdc, kickosd);
	mutex_unlock(&osdc->request_mutex);
}
S
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/*
609
 * If the osd connection drops, we need to resubmit all requests.
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 */
static void osd_reset(struct ceph_connection *con)
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc;

	if (!osd)
		return;
	dout("osd_reset osd%d\n", osd->o_osd);
	osdc = osd->o_osdc;
	down_read(&osdc->map_sem);
621 622
	kick_osd_requests(osdc, osd);
	send_queued(osdc);
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623 624 625 626 627 628
	up_read(&osdc->map_sem);
}

/*
 * Track open sessions with osds.
 */
629
static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
S
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630 631 632 633 634 635 636 637 638
{
	struct ceph_osd *osd;

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

	atomic_set(&osd->o_ref, 1);
	osd->o_osdc = osdc;
639
	osd->o_osd = onum;
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640
	INIT_LIST_HEAD(&osd->o_requests);
641
	INIT_LIST_HEAD(&osd->o_linger_requests);
642
	INIT_LIST_HEAD(&osd->o_osd_lru);
S
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643 644
	osd->o_incarnation = 1;

645
	ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
646

647
	INIT_LIST_HEAD(&osd->o_keepalive_item);
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648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666
	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);
667
	if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
S
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668 669
		struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;

670
		if (ac->ops && ac->ops->destroy_authorizer)
671
			ac->ops->destroy_authorizer(ac, osd->o_auth.authorizer);
S
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672
		kfree(osd);
S
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673
	}
S
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674 675 676 677 678
}

/*
 * remove an osd from our map
 */
679
static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
S
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680
{
681
	dout("__remove_osd %p\n", osd);
S
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682 683
	BUG_ON(!list_empty(&osd->o_requests));
	rb_erase(&osd->o_node, &osdc->osds);
684
	list_del_init(&osd->o_osd_lru);
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685 686 687 688
	ceph_con_close(&osd->o_con);
	put_osd(osd);
}

689 690 691 692 693 694 695 696 697 698 699 700
static void remove_all_osds(struct ceph_osd_client *osdc)
{
	dout("__remove_old_osds %p\n", osdc);
	mutex_lock(&osdc->request_mutex);
	while (!RB_EMPTY_ROOT(&osdc->osds)) {
		struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
						struct ceph_osd, o_node);
		__remove_osd(osdc, osd);
	}
	mutex_unlock(&osdc->request_mutex);
}

701 702 703 704 705 706
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);
707
	osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
708 709 710 711 712 713 714 715 716
}

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);
}

717
static void remove_old_osds(struct ceph_osd_client *osdc)
718 719 720 721 722 723
{
	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) {
724
		if (time_before(jiffies, osd->lru_ttl))
725 726 727 728 729 730
			break;
		__remove_osd(osdc, osd);
	}
	mutex_unlock(&osdc->request_mutex);
}

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731 732 733
/*
 * reset osd connect
 */
734
static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
S
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735
{
736
	struct ceph_osd_request *req;
S
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737 738
	int ret = 0;

739
	dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
740 741
	if (list_empty(&osd->o_requests) &&
	    list_empty(&osd->o_linger_requests)) {
742
		__remove_osd(osdc, osd);
743 744 745 746 747 748 749 750 751 752
	} 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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753 754
	} else {
		ceph_con_close(&osd->o_con);
755 756
		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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757 758 759 760 761 762 763 764 765 766 767
		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;

768
	dout("__insert_osd %p osd%d\n", new, new->o_osd);
S
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769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800
	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;
}

801 802 803
static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
{
	schedule_delayed_work(&osdc->timeout_work,
804
			osdc->client->options->osd_keepalive_timeout * HZ);
805 806 807 808 809 810
}

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.
 */
816 817
static void __register_request(struct ceph_osd_client *osdc,
			       struct ceph_osd_request *req)
S
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818 819
{
	req->r_tid = ++osdc->last_tid;
820
	req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
821
	dout("__register_request %p tid %lld\n", req, req->r_tid);
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822 823 824 825
	__insert_request(osdc, req);
	ceph_osdc_get_request(req);
	osdc->num_requests++;
	if (osdc->num_requests == 1) {
826 827
		dout(" first request, scheduling timeout\n");
		__schedule_osd_timeout(osdc);
S
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828
	}
829 830 831 832 833 834 835
}

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)
{
845 846 847 848 849 850
	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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851 852 853 854
	dout("__unregister_request %p tid %lld\n", req, req->r_tid);
	rb_erase(&req->r_node, &osdc->requests);
	osdc->num_requests--;

855 856
	if (req->r_osd) {
		/* make sure the original request isn't in flight. */
857
		ceph_msg_revoke(req->r_request);
858 859

		list_del_init(&req->r_osd_item);
860 861 862
		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);
863
			__move_osd_to_lru(osdc, req->r_osd);
864
		}
865
		if (list_empty(&req->r_linger_item))
866
			req->r_osd = NULL;
867
	}
S
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868 869 870

	ceph_osdc_put_request(req);

871 872 873 874
	list_del_init(&req->r_req_lru_item);
	if (osdc->num_requests == 0) {
		dout(" no requests, canceling timeout\n");
		__cancel_osd_timeout(osdc);
S
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875 876 877 878 879 880 881 882
	}
}

/*
 * Cancel a previously queued request message
 */
static void __cancel_request(struct ceph_osd_request *req)
{
883
	if (req->r_sent && req->r_osd) {
884
		ceph_msg_revoke(req->r_request);
S
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885 886 887 888
		req->r_sent = 0;
	}
}

889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909
static void __register_linger_request(struct ceph_osd_client *osdc,
				    struct ceph_osd_request *req)
{
	dout("__register_linger_request %p\n", req);
	list_add_tail(&req->r_linger_item, &osdc->req_linger);
	list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
}

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

		if (list_empty(&req->r_osd->o_requests) &&
		    list_empty(&req->r_osd->o_linger_requests)) {
			dout("moving osd to %p lru\n", req->r_osd);
			__move_osd_to_lru(osdc, req->r_osd);
		}
910 911
		if (list_empty(&req->r_osd_item))
			req->r_osd = NULL;
912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
	}
}

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
942 943 944
/*
 * 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
945
 * no up osd, set r_osd to NULL.  Move the request to the appropriate list
946
 * (unsent, homeless) or leave on in-flight lru.
S
Sage Weil 已提交
947 948 949 950 951
 *
 * Return 0 if unchanged, 1 if changed, or negative on error.
 *
 * Caller should hold map_sem for read and request_mutex.
 */
952
static int __map_request(struct ceph_osd_client *osdc,
953
			 struct ceph_osd_request *req, int force_resend)
S
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954 955
{
	struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
956
	struct ceph_pg pgid;
957 958
	int acting[CEPH_PG_MAX_SIZE];
	int o = -1, num = 0;
S
Sage Weil 已提交
959 960
	int err;

961
	dout("map_request %p tid %lld\n", req, req->r_tid);
S
Sage Weil 已提交
962 963
	err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
				      &req->r_file_layout, osdc->osdmap);
964 965
	if (err) {
		list_move(&req->r_req_lru_item, &osdc->req_notarget);
S
Sage Weil 已提交
966
		return err;
967
	}
968
	pgid = reqhead->layout.ol_pgid;
969 970
	req->r_pgid = pgid;

971 972 973 974 975
	err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
	if (err > 0) {
		o = acting[0];
		num = err;
	}
S
Sage Weil 已提交
976

977 978
	if ((!force_resend &&
	     req->r_osd && req->r_osd->o_osd == o &&
979 980 981
	     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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982 983 984
	    (req->r_osd == NULL && o == -1))
		return 0;  /* no change */

985
	dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
986
	     req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
S
Sage Weil 已提交
987 988
	     req->r_osd ? req->r_osd->o_osd : -1);

989 990 991 992
	/* 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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993 994 995 996 997 998 999 1000
	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) {
1001
		err = -ENOMEM;
1002
		req->r_osd = create_osd(osdc, o);
1003 1004
		if (!req->r_osd) {
			list_move(&req->r_req_lru_item, &osdc->req_notarget);
1005
			goto out;
1006
		}
S
Sage Weil 已提交
1007

1008
		dout("map_request osd %p is osd%d\n", req->r_osd, o);
S
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1009 1010
		__insert_osd(osdc, req->r_osd);

1011 1012 1013
		ceph_con_open(&req->r_osd->o_con,
			      CEPH_ENTITY_TYPE_OSD, o,
			      &osdc->osdmap->osd_addr[o]);
S
Sage Weil 已提交
1014 1015
	}

1016 1017
	if (req->r_osd) {
		__remove_osd_from_lru(req->r_osd);
S
Sage Weil 已提交
1018
		list_add(&req->r_osd_item, &req->r_osd->o_requests);
1019 1020 1021
		list_move(&req->r_req_lru_item, &osdc->req_unsent);
	} else {
		list_move(&req->r_req_lru_item, &osdc->req_notarget);
1022
	}
1023
	err = 1;   /* osd or pg changed */
S
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1024 1025 1026 1027 1028 1029 1030 1031

out:
	return err;
}

/*
 * caller should hold map_sem (for read) and request_mutex
 */
1032 1033
static void __send_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req)
S
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1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
{
	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
1045
	req->r_stamp = jiffies;
1046
	list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
S
Sage Weil 已提交
1047 1048 1049 1050 1051 1052

	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;
}

1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
/*
 * 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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1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
/*
 * 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);
1081
	struct ceph_osd_request *req, *last_req = NULL;
S
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1082
	struct ceph_osd *osd;
1083
	unsigned long timeout = osdc->client->options->osd_timeout * HZ;
1084
	unsigned long keepalive =
1085
		osdc->client->options->osd_keepalive_timeout * HZ;
S
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1086
	unsigned long last_stamp = 0;
1087
	struct list_head slow_osds;
S
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1088 1089 1090 1091 1092 1093 1094
	dout("timeout\n");
	down_read(&osdc->map_sem);

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

	mutex_lock(&osdc->request_mutex);

1095 1096 1097 1098 1099 1100 1101
	/*
	 * reset osds that appear to be _really_ unresponsive.  this
	 * is a failsafe measure.. we really shouldn't be getting to
	 * this point if the system is working properly.  the monitors
	 * should mark the osd as failed and we should find out about
	 * it from an updated osd map.
	 */
S
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1102
	while (timeout && !list_empty(&osdc->req_lru)) {
1103 1104 1105
		req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
				 r_req_lru_item);

1106
		/* hasn't been long enough since we sent it? */
S
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1107
		if (time_before(jiffies, req->r_stamp + timeout))
1108
			break;
1109 1110 1111 1112 1113

		/* hasn't been long enough since it was acked? */
		if (req->r_request->ack_stamp == 0 ||
		    time_before(jiffies, req->r_request->ack_stamp + timeout))
			break;
1114

S
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1115
		BUG_ON(req == last_req && req->r_stamp == last_stamp);
1116
		last_req = req;
S
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1117
		last_stamp = req->r_stamp;
1118 1119 1120 1121 1122

		osd = req->r_osd;
		BUG_ON(!osd);
		pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
			   req->r_tid, osd->o_osd);
1123
		__kick_osd_requests(osdc, osd);
1124 1125 1126 1127 1128 1129 1130 1131 1132
	}

	/*
	 * 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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1133
		if (time_before(jiffies, req->r_stamp + keepalive))
1134 1135 1136 1137 1138
			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
1139
		     req->r_tid, osd->o_osd);
1140 1141 1142 1143 1144 1145
		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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1146 1147 1148
		ceph_con_keepalive(&osd->o_con);
	}

1149
	__schedule_osd_timeout(osdc);
S
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1150
	mutex_unlock(&osdc->request_mutex);
1151
	send_queued(osdc);
S
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1152 1153 1154
	up_read(&osdc->map_sem);
}

1155 1156 1157 1158 1159 1160
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 =
1161
		osdc->client->options->osd_idle_ttl * HZ >> 2;
1162 1163 1164

	dout("osds timeout\n");
	down_read(&osdc->map_sem);
1165
	remove_old_osds(osdc);
1166 1167 1168 1169 1170 1171
	up_read(&osdc->map_sem);

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

S
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1172 1173 1174 1175 1176 1177 1178
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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1179 1180 1181 1182
/*
 * handle osd op reply.  either call the callback if it is specified,
 * or do the completion to wake up the waiting thread.
 */
1183 1184
static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
			 struct ceph_connection *con)
S
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1185 1186 1187 1188 1189
{
	struct ceph_osd_reply_head *rhead = msg->front.iov_base;
	struct ceph_osd_request *req;
	u64 tid;
	int numops, object_len, flags;
1190
	s32 result;
S
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1191

1192
	tid = le64_to_cpu(msg->hdr.tid);
S
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1193 1194 1195 1196
	if (msg->front.iov_len < sizeof(*rhead))
		goto bad;
	numops = le32_to_cpu(rhead->num_ops);
	object_len = le32_to_cpu(rhead->object_len);
1197
	result = le32_to_cpu(rhead->result);
S
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1198 1199 1200
	if (msg->front.iov_len != sizeof(*rhead) + object_len +
	    numops * sizeof(struct ceph_osd_op))
		goto bad;
1201
	dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
S
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1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
	/* 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);

1213
	/*
1214
	 * if this connection filled our message, drop our reference now, to
1215 1216
	 * avoid a (safe but slower) revoke later.
	 */
1217
	if (req->r_con_filling_msg == con && req->r_reply == msg) {
S
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1218
		dout(" dropping con_filling_msg ref %p\n", con);
1219
		req->r_con_filling_msg = NULL;
1220
		con->ops->put(con);
1221 1222
	}

S
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1223
	if (!req->r_got_reply) {
1224
		unsigned int bytes;
S
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1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238

		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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1239
		mutex_unlock(&osdc->request_mutex);
S
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1240 1241 1242 1243 1244
		goto done;
	}

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

1245 1246 1247
	if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
		__register_linger_request(osdc, req);

S
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1248
	/* either this is a read, or we got the safe response */
1249 1250
	if (result < 0 ||
	    (flags & CEPH_OSD_FLAG_ONDISK) ||
S
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1251 1252 1253 1254 1255 1256 1257 1258
	    ((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
1259
		complete_all(&req->r_completion);
S
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1260

S
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1261 1262
	if (flags & CEPH_OSD_FLAG_ONDISK)
		complete_request(req);
S
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1263 1264

done:
1265
	dout("req=%p req->r_linger=%d\n", req, req->r_linger);
S
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1266 1267 1268 1269 1270 1271 1272
	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));
1273
	ceph_msg_dump(msg);
S
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1274 1275
}

1276
static void reset_changed_osds(struct ceph_osd_client *osdc)
S
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1277 1278 1279
{
	struct rb_node *p, *n;

1280 1281
	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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1282

1283 1284 1285 1286 1287 1288 1289
		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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1290
	}
1291 1292 1293
}

/*
1294 1295
 * Requeue requests whose mapping to an OSD has changed.  If requests map to
 * no osd, request a new map.
1296 1297 1298
 *
 * Caller should hold map_sem for read and request_mutex.
 */
1299
static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1300
{
1301
	struct ceph_osd_request *req, *nreq;
1302 1303 1304
	struct rb_node *p;
	int needmap = 0;
	int err;
1305

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

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

1328
		err = __map_request(osdc, req, force_resend);
1329 1330 1331 1332 1333 1334 1335 1336
		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;
1337
		}
1338 1339 1340 1341 1342

		dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
		     req->r_osd ? req->r_osd->o_osd : -1);
		__unregister_linger_request(osdc, req);
		__register_request(osdc, req);
1343
	}
S
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1344 1345 1346 1347 1348 1349
	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);
	}
1350
}
1351 1352


S
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1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
/*
 * 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));
1376 1377
	if (ceph_check_fsid(osdc->client, &fsid) < 0)
		return;
S
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1378 1379 1380 1381 1382 1383 1384 1385

	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);
1386 1387
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1388 1389 1390 1391 1392 1393 1394
		ceph_decode_need(&p, end, maplen, bad);
		next = p + maplen;
		if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
			dout("applying incremental map %u len %d\n",
			     epoch, maplen);
			newmap = osdmap_apply_incremental(&p, next,
							  osdc->osdmap,
1395
							  &osdc->client->msgr);
S
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1396 1397 1398 1399
			if (IS_ERR(newmap)) {
				err = PTR_ERR(newmap);
				goto bad;
			}
1400
			BUG_ON(!newmap);
S
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1401 1402 1403 1404
			if (newmap != osdc->osdmap) {
				ceph_osdmap_destroy(osdc->osdmap);
				osdc->osdmap = newmap;
			}
1405
			kick_requests(osdc, 0);
1406
			reset_changed_osds(osdc);
S
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1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421
		} 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);
1422 1423
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
Sage Weil 已提交
1424 1425 1426 1427 1428 1429 1430 1431 1432
		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 {
1433 1434
			int skipped_map = 0;

S
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1435 1436 1437 1438 1439 1440
			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;
			}
1441
			BUG_ON(!newmap);
S
Sage Weil 已提交
1442 1443
			oldmap = osdc->osdmap;
			osdc->osdmap = newmap;
1444 1445 1446
			if (oldmap) {
				if (oldmap->epoch + 1 < newmap->epoch)
					skipped_map = 1;
S
Sage Weil 已提交
1447
				ceph_osdmap_destroy(oldmap);
1448 1449
			}
			kick_requests(osdc, skipped_map);
S
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1450 1451 1452 1453 1454 1455 1456 1457
		}
		p += maplen;
		nr_maps--;
	}

done:
	downgrade_write(&osdc->map_sem);
	ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1458 1459 1460 1461 1462 1463 1464 1465 1466

	/*
	 * 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);

1467
	send_queued(osdc);
S
Sage Weil 已提交
1468
	up_read(&osdc->map_sem);
1469
	wake_up_all(&osdc->client->auth_wq);
S
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1470 1471 1472 1473
	return;

bad:
	pr_err("osdc handle_map corrupt msg\n");
1474
	ceph_msg_dump(msg);
S
Sage Weil 已提交
1475 1476 1477 1478
	up_write(&osdc->map_sem);
	return;
}

1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657
/*
 * watch/notify callback event infrastructure
 *
 * These callbacks are used both for watch and notify operations.
 */
static void __release_event(struct kref *kref)
{
	struct ceph_osd_event *event =
		container_of(kref, struct ceph_osd_event, kref);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


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

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


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

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

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

	spin_lock(&osdc->event_lock);
	event = __find_event(osdc, cookie);
	if (event) {
		get_event(event);
		if (event->one_shot)
			__remove_event(event);
	}
	spin_unlock(&osdc->event_lock);
	dout("handle_watch_notify cookie %lld ver %lld event %p\n",
	     cookie, ver, event);
	if (event) {
		event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
		if (!event_work) {
			dout("ERROR: could not allocate event_work\n");
			goto done_err;
		}
1658
		INIT_WORK(&event_work->work, do_event_work);
1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695
		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
1696 1697 1698 1699 1700 1701 1702
/*
 * 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
1703
	int rc = 0;
S
Sage Weil 已提交
1704 1705 1706

	req->r_request->pages = req->r_pages;
	req->r_request->nr_pages = req->r_num_pages;
1707 1708 1709 1710
#ifdef CONFIG_BLOCK
	req->r_request->bio = req->r_bio;
#endif
	req->r_request->trail = req->r_trail;
S
Sage Weil 已提交
1711 1712 1713 1714 1715

	register_request(osdc, req);

	down_read(&osdc->map_sem);
	mutex_lock(&osdc->request_mutex);
S
Sage Weil 已提交
1716 1717 1718 1719 1720 1721
	/*
	 * 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) {
1722
		rc = __map_request(osdc, req, 0);
1723 1724 1725 1726 1727 1728
		if (rc < 0) {
			if (nofail) {
				dout("osdc_start_request failed map, "
				     " will retry %lld\n", req->r_tid);
				rc = 0;
			}
1729
			goto out_unlock;
1730
		}
1731 1732 1733 1734
		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 {
1735
			__send_request(osdc, req);
S
Sage Weil 已提交
1736
		}
1737
		rc = 0;
S
Sage Weil 已提交
1738
	}
1739 1740

out_unlock:
S
Sage Weil 已提交
1741 1742 1743 1744
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
	return rc;
}
1745
EXPORT_SYMBOL(ceph_osdc_start_request);
S
Sage Weil 已提交
1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758

/*
 * 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);
1759
		__unregister_request(osdc, req);
S
Sage Weil 已提交
1760
		mutex_unlock(&osdc->request_mutex);
S
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1761
		complete_request(req);
1762
		dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
S
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1763 1764 1765 1766 1767 1768
		return rc;
	}

	dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
	return req->r_result;
}
1769
EXPORT_SYMBOL(ceph_osdc_wait_request);
S
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1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802

/*
 * 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);
}
1803
EXPORT_SYMBOL(ceph_osdc_sync);
S
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1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820

/*
 * 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;
1821
	INIT_LIST_HEAD(&osdc->osd_lru);
S
Sage Weil 已提交
1822
	osdc->requests = RB_ROOT;
1823
	INIT_LIST_HEAD(&osdc->req_lru);
1824 1825
	INIT_LIST_HEAD(&osdc->req_unsent);
	INIT_LIST_HEAD(&osdc->req_notarget);
1826
	INIT_LIST_HEAD(&osdc->req_linger);
S
Sage Weil 已提交
1827 1828
	osdc->num_requests = 0;
	INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1829
	INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1830 1831 1832
	spin_lock_init(&osdc->event_lock);
	osdc->event_tree = RB_ROOT;
	osdc->event_count = 0;
1833 1834

	schedule_delayed_work(&osdc->osds_timeout_work,
1835
	   round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
S
Sage Weil 已提交
1836

1837
	err = -ENOMEM;
S
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1838 1839 1840
	osdc->req_mempool = mempool_create_kmalloc_pool(10,
					sizeof(struct ceph_osd_request));
	if (!osdc->req_mempool)
1841
		goto out;
S
Sage Weil 已提交
1842

1843 1844
	err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
				OSD_OP_FRONT_LEN, 10, true,
1845
				"osd_op");
S
Sage Weil 已提交
1846
	if (err < 0)
1847
		goto out_mempool;
1848
	err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
1849 1850
				OSD_OPREPLY_FRONT_LEN, 10, true,
				"osd_op_reply");
S
Sage Weil 已提交
1851 1852
	if (err < 0)
		goto out_msgpool;
1853 1854 1855 1856 1857 1858 1859

	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
1860
	return 0;
1861

S
Sage Weil 已提交
1862 1863
out_msgpool:
	ceph_msgpool_destroy(&osdc->msgpool_op);
1864 1865 1866 1867
out_mempool:
	mempool_destroy(osdc->req_mempool);
out:
	return err;
S
Sage Weil 已提交
1868
}
1869
EXPORT_SYMBOL(ceph_osdc_init);
S
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1870 1871 1872

void ceph_osdc_stop(struct ceph_osd_client *osdc)
{
1873 1874
	flush_workqueue(osdc->notify_wq);
	destroy_workqueue(osdc->notify_wq);
S
Sage Weil 已提交
1875
	cancel_delayed_work_sync(&osdc->timeout_work);
1876
	cancel_delayed_work_sync(&osdc->osds_timeout_work);
S
Sage Weil 已提交
1877 1878 1879 1880
	if (osdc->osdmap) {
		ceph_osdmap_destroy(osdc->osdmap);
		osdc->osdmap = NULL;
	}
1881
	remove_all_osds(osdc);
S
Sage Weil 已提交
1882 1883
	mempool_destroy(osdc->req_mempool);
	ceph_msgpool_destroy(&osdc->msgpool_op);
S
Sage Weil 已提交
1884
	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
S
Sage Weil 已提交
1885
}
1886
EXPORT_SYMBOL(ceph_osdc_stop);
S
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1887 1888 1889 1890 1891 1892 1893 1894 1895

/*
 * 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,
1896
			struct page **pages, int num_pages, int page_align)
S
Sage Weil 已提交
1897 1898 1899 1900 1901 1902 1903 1904 1905
{
	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,
1906
				    false, 1, page_align);
1907 1908
	if (!req)
		return -ENOMEM;
S
Sage Weil 已提交
1909 1910 1911 1912

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

1913 1914
	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
1915 1916 1917 1918 1919 1920 1921 1922 1923

	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;
}
1924
EXPORT_SYMBOL(ceph_osdc_readpages);
S
Sage Weil 已提交
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939

/*
 * 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;
1940
	int page_align = off & ~PAGE_MASK;
S
Sage Weil 已提交
1941 1942 1943 1944 1945 1946 1947 1948

	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,
1949
				    nofail, 1, page_align);
1950 1951
	if (!req)
		return -ENOMEM;
S
Sage Weil 已提交
1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967

	/* 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;
}
1968
EXPORT_SYMBOL(ceph_osdc_writepages);
S
Sage Weil 已提交
1969 1970 1971 1972 1973 1974 1975

/*
 * handle incoming message
 */
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
{
	struct ceph_osd *osd = con->private;
1976
	struct ceph_osd_client *osdc;
S
Sage Weil 已提交
1977 1978 1979
	int type = le16_to_cpu(msg->hdr.type);

	if (!osd)
S
Sage Weil 已提交
1980
		goto out;
1981
	osdc = osd->o_osdc;
S
Sage Weil 已提交
1982 1983 1984 1985 1986 1987

	switch (type) {
	case CEPH_MSG_OSD_MAP:
		ceph_osdc_handle_map(osdc, msg);
		break;
	case CEPH_MSG_OSD_OPREPLY:
1988
		handle_reply(osdc, msg, con);
S
Sage Weil 已提交
1989
		break;
1990 1991 1992
	case CEPH_MSG_WATCH_NOTIFY:
		handle_watch_notify(osdc, msg);
		break;
S
Sage Weil 已提交
1993 1994 1995 1996 1997

	default:
		pr_err("received unknown message type %d %s\n", type,
		       ceph_msg_type_name(type));
	}
S
Sage Weil 已提交
1998
out:
S
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1999 2000 2001
	ceph_msg_put(msg);
}

2002
/*
2003 2004
 * lookup and return message for incoming reply.  set up reply message
 * pages.
2005 2006
 */
static struct ceph_msg *get_reply(struct ceph_connection *con,
2007 2008
				  struct ceph_msg_header *hdr,
				  int *skip)
S
Sage Weil 已提交
2009 2010 2011
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc = osd->o_osdc;
2012
	struct ceph_msg *m;
2013
	struct ceph_osd_request *req;
2014 2015
	int front = le32_to_cpu(hdr->front_len);
	int data_len = le32_to_cpu(hdr->data_len);
2016
	u64 tid;
S
Sage Weil 已提交
2017

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

	if (req->r_con_filling_msg) {
2030
		dout("%s revoking msg %p from old con %p\n", __func__,
S
Sage Weil 已提交
2031
		     req->r_reply, req->r_con_filling_msg);
2032
		ceph_msg_revoke_incoming(req->r_reply);
2033
		req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
2034
		req->r_con_filling_msg = NULL;
2035 2036
	}

S
Sage Weil 已提交
2037 2038 2039
	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);
2040
		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2041
		if (!m)
S
Sage Weil 已提交
2042 2043 2044 2045 2046 2047
			goto out;
		ceph_msg_put(req->r_reply);
		req->r_reply = m;
	}
	m = ceph_msg_get(req->r_reply);

2048
	if (data_len > 0) {
2049
		int want = calc_pages_for(req->r_page_alignment, data_len);
2050 2051

		if (unlikely(req->r_num_pages < want)) {
2052 2053 2054
			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);
2055 2056
			*skip = 1;
			ceph_msg_put(m);
2057
			m = NULL;
2058
			goto out;
2059
		}
2060 2061
		m->pages = req->r_pages;
		m->nr_pages = req->r_num_pages;
2062
		m->page_alignment = req->r_page_alignment;
2063 2064 2065
#ifdef CONFIG_BLOCK
		m->bio = req->r_bio;
#endif
2066
	}
2067
	*skip = 0;
2068
	req->r_con_filling_msg = con->ops->get(con);
S
Sage Weil 已提交
2069
	dout("get_reply tid %lld %p\n", tid, m);
2070 2071 2072

out:
	mutex_unlock(&osdc->request_mutex);
2073
	return m;
2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084

}

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
2085
	*skip = 0;
2086 2087
	switch (type) {
	case CEPH_MSG_OSD_MAP:
2088
	case CEPH_MSG_WATCH_NOTIFY:
2089
		return ceph_msg_new(type, front, GFP_NOFS, false);
2090 2091 2092 2093 2094 2095 2096 2097
	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
2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116
}

/*
 * 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);
}

2117 2118 2119
/*
 * authentication
 */
2120 2121 2122 2123 2124
/*
 * 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,
2125
					int *proto, int force_new)
2126 2127 2128 2129
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;
2130
	struct ceph_auth_handshake *auth = &o->o_auth;
2131

2132
	if (force_new && auth->authorizer) {
2133 2134
		if (ac->ops && ac->ops->destroy_authorizer)
			ac->ops->destroy_authorizer(ac, auth->authorizer);
2135 2136
		auth->authorizer = NULL;
	}
2137
	if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
2138 2139
		int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
							auth);
2140
		if (ret)
2141
			return ERR_PTR(ret);
2142 2143
	}
	*proto = ac->protocol;
2144

2145
	return auth;
2146 2147 2148 2149 2150 2151 2152 2153 2154
}


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;

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	/*
	 * XXX If ac->ops or ac->ops->verify_authorizer_reply is null,
	 * XXX which do we do:  succeed or fail?
	 */
2159
	return ac->ops->verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2160 2161
}

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

2168
	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);
}
2173

2174
static const struct ceph_connection_operations osd_con_ops = {
S
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	.get = get_osd_con,
	.put = put_osd_con,
	.dispatch = dispatch,
2178 2179
	.get_authorizer = get_authorizer,
	.verify_authorizer_reply = verify_authorizer_reply,
2180
	.invalidate_authorizer = invalidate_authorizer,
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	.alloc_msg = alloc_msg,
2182
	.fault = osd_reset,
S
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};