osd_client.c 44.8 KB
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#include <linux/ceph/ceph_debug.h>
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#include <linux/module.h>
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#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
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#ifdef CONFIG_BLOCK
#include <linux/bio.h>
#endif
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#include <linux/ceph/libceph.h>
#include <linux/ceph/osd_client.h>
#include <linux/ceph/messenger.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/auth.h>
#include <linux/ceph/pagelist.h>
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#define OSD_OP_FRONT_LEN	4096
#define OSD_OPREPLY_FRONT_LEN	512
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static const struct ceph_connection_operations osd_con_ops;
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static int __kick_requests(struct ceph_osd_client *osdc,
			  struct ceph_osd *kickosd);
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static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd);

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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:
		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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	sprintf(req->r_oid, "%llx.%08llx", vino.ino, bno);
	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);
	if (req->r_reply)
		ceph_msg_put(req->r_reply);
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	if (req->r_con_filling_msg) {
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		dout("release_request revoking pages %p from con %p\n",
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		     req->r_pages, req->r_con_filling_msg);
		ceph_con_revoke_message(req->r_con_filling_msg,
				      req->r_reply);
		ceph_con_put(req->r_con_filling_msg);
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	}
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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);
	INIT_LIST_HEAD(&req->r_unsafe_item);
	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);
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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 += 40;
	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);
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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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	msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
	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);

	switch (dst->op) {
	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;
	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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	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 (IS_ERR(req))
		return req;

	/* 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 alignment that calc_layout
	   filled in for us */
	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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 * 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);
	kick_requests(osdc, osd);
	up_read(&osdc->map_sem);
}

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

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

	atomic_set(&osd->o_ref, 1);
	osd->o_osdc = osdc;
	INIT_LIST_HEAD(&osd->o_requests);
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	INIT_LIST_HEAD(&osd->o_osd_lru);
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	osd->o_incarnation = 1;

	ceph_con_init(osdc->client->msgr, &osd->o_con);
	osd->o_con.private = osd;
	osd->o_con.ops = &osd_con_ops;
	osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
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	INIT_LIST_HEAD(&osd->o_keepalive_item);
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	return osd;
}

static struct ceph_osd *get_osd(struct ceph_osd *osd)
{
	if (atomic_inc_not_zero(&osd->o_ref)) {
		dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
		     atomic_read(&osd->o_ref));
		return osd;
	} else {
		dout("get_osd %p FAIL\n", osd);
		return NULL;
	}
}

static void put_osd(struct ceph_osd *osd)
{
	dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
	     atomic_read(&osd->o_ref) - 1);
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	if (atomic_dec_and_test(&osd->o_ref)) {
		struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;

		if (osd->o_authorizer)
			ac->ops->destroy_authorizer(ac, osd->o_authorizer);
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		kfree(osd);
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596
	}
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}

/*
 * remove an osd from our map
 */
602
static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
S
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603
{
604
	dout("__remove_osd %p\n", osd);
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	BUG_ON(!list_empty(&osd->o_requests));
	rb_erase(&osd->o_node, &osdc->osds);
607
	list_del_init(&osd->o_osd_lru);
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	ceph_con_close(&osd->o_con);
	put_osd(osd);
}

612 613 614 615 616 617
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);
618
	osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641
}

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);
}

static void remove_old_osds(struct ceph_osd_client *osdc, int remove_all)
{
	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) {
		if (!remove_all && time_before(jiffies, osd->lru_ttl))
			break;
		__remove_osd(osdc, osd);
	}
	mutex_unlock(&osdc->request_mutex);
}

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/*
 * reset osd connect
 */
645
static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
S
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646
{
647
	struct ceph_osd_request *req;
S
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648 649
	int ret = 0;

650
	dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
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651
	if (list_empty(&osd->o_requests)) {
652
		__remove_osd(osdc, osd);
653 654 655 656 657 658 659 660 661 662
	} 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;
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	} else {
		ceph_con_close(&osd->o_con);
		ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
		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;

	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;
}

709 710 711
static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
{
	schedule_delayed_work(&osdc->timeout_work,
712
			osdc->client->options->osd_keepalive_timeout * HZ);
713 714 715 716 717 718
}

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.
 */
static void register_request(struct ceph_osd_client *osdc,
			     struct ceph_osd_request *req)
{
	mutex_lock(&osdc->request_mutex);
	req->r_tid = ++osdc->last_tid;
729
	req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
730
	INIT_LIST_HEAD(&req->r_req_lru_item);
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731 732 733 734 735 736 737

	dout("register_request %p tid %lld\n", req, req->r_tid);
	__insert_request(osdc, req);
	ceph_osdc_get_request(req);
	osdc->num_requests++;

	if (osdc->num_requests == 1) {
738 739
		dout(" first request, scheduling timeout\n");
		__schedule_osd_timeout(osdc);
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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)
{
	dout("__unregister_request %p tid %lld\n", req, req->r_tid);
	rb_erase(&req->r_node, &osdc->requests);
	osdc->num_requests--;

754 755 756 757 758 759
	if (req->r_osd) {
		/* make sure the original request isn't in flight. */
		ceph_con_revoke(&req->r_osd->o_con, req->r_request);

		list_del_init(&req->r_osd_item);
		if (list_empty(&req->r_osd->o_requests))
760
			__move_osd_to_lru(osdc, req->r_osd);
761 762
		req->r_osd = NULL;
	}
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763 764 765

	ceph_osdc_put_request(req);

766 767 768 769
	list_del_init(&req->r_req_lru_item);
	if (osdc->num_requests == 0) {
		dout(" no requests, canceling timeout\n");
		__cancel_osd_timeout(osdc);
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770 771 772 773 774 775 776 777
	}
}

/*
 * Cancel a previously queued request message
 */
static void __cancel_request(struct ceph_osd_request *req)
{
778
	if (req->r_sent && req->r_osd) {
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		ceph_con_revoke(&req->r_osd->o_con, req->r_request);
		req->r_sent = 0;
	}
782
	list_del_init(&req->r_req_lru_item);
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}

/*
 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
 * (as needed), and set the request r_osd appropriately.  If there is
 * no up osd, set r_osd to NULL.
 *
 * Return 0 if unchanged, 1 if changed, or negative on error.
 *
 * Caller should hold map_sem for read and request_mutex.
 */
static int __map_osds(struct ceph_osd_client *osdc,
		      struct ceph_osd_request *req)
{
	struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
798
	struct ceph_pg pgid;
799 800
	int acting[CEPH_PG_MAX_SIZE];
	int o = -1, num = 0;
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	int err;

	dout("map_osds %p tid %lld\n", req, req->r_tid);
	err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
				      &req->r_file_layout, osdc->osdmap);
	if (err)
		return err;
808
	pgid = reqhead->layout.ol_pgid;
809 810
	req->r_pgid = pgid;

811 812 813 814 815
	err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
	if (err > 0) {
		o = acting[0];
		num = err;
	}
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	if ((req->r_osd && req->r_osd->o_osd == o &&
818 819 820
	     req->r_sent >= req->r_osd->o_incarnation &&
	     req->r_num_pg_osds == num &&
	     memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
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821 822 823
	    (req->r_osd == NULL && o == -1))
		return 0;  /* no change */

824 825
	dout("map_osds tid %llu pgid %d.%x osd%d (was osd%d)\n",
	     req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
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826 827
	     req->r_osd ? req->r_osd->o_osd : -1);

828 829 830 831
	/* record full pg acting set */
	memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
	req->r_num_pg_osds = num;

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	if (req->r_osd) {
		__cancel_request(req);
		list_del_init(&req->r_osd_item);
		req->r_osd = NULL;
	}

	req->r_osd = __lookup_osd(osdc, o);
	if (!req->r_osd && o >= 0) {
840 841 842 843
		err = -ENOMEM;
		req->r_osd = create_osd(osdc);
		if (!req->r_osd)
			goto out;
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844 845 846 847 848 849 850 851 852

		dout("map_osds osd %p is osd%d\n", req->r_osd, o);
		req->r_osd->o_osd = o;
		req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
		__insert_osd(osdc, req->r_osd);

		ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
	}

853 854
	if (req->r_osd) {
		__remove_osd_from_lru(req->r_osd);
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855
		list_add(&req->r_osd_item, &req->r_osd->o_requests);
856
	}
857
	err = 1;   /* osd or pg changed */
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858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888

out:
	return err;
}

/*
 * caller should hold map_sem (for read) and request_mutex
 */
static int __send_request(struct ceph_osd_client *osdc,
			  struct ceph_osd_request *req)
{
	struct ceph_osd_request_head *reqhead;
	int err;

	err = __map_osds(osdc, req);
	if (err < 0)
		return err;
	if (req->r_osd == NULL) {
		dout("send_request %p no up osds in pg\n", req);
		ceph_monc_request_next_osdmap(&osdc->client->monc);
		return 0;
	}

	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
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889
	req->r_stamp = jiffies;
890
	list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
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891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910

	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;
	return 0;
}

/*
 * 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);
911
	struct ceph_osd_request *req, *last_req = NULL;
S
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912
	struct ceph_osd *osd;
913
	unsigned long timeout = osdc->client->options->osd_timeout * HZ;
914
	unsigned long keepalive =
915
		osdc->client->options->osd_keepalive_timeout * HZ;
S
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916
	unsigned long last_stamp = 0;
S
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917
	struct rb_node *p;
918
	struct list_head slow_osds;
S
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919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941

	dout("timeout\n");
	down_read(&osdc->map_sem);

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

	mutex_lock(&osdc->request_mutex);
	for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
		req = rb_entry(p, struct ceph_osd_request, r_node);

		if (req->r_resend) {
			int err;

			dout("osdc resending prev failed %lld\n", req->r_tid);
			err = __send_request(osdc, req);
			if (err)
				dout("osdc failed again on %lld\n", req->r_tid);
			else
				req->r_resend = false;
			continue;
		}
	}

942 943 944 945 946 947 948
	/*
	 * 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
Sage Weil 已提交
949
	while (timeout && !list_empty(&osdc->req_lru)) {
950 951 952
		req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
				 r_req_lru_item);

S
Sage Weil 已提交
953
		if (time_before(jiffies, req->r_stamp + timeout))
954 955
			break;

S
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956
		BUG_ON(req == last_req && req->r_stamp == last_stamp);
957
		last_req = req;
S
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958
		last_stamp = req->r_stamp;
959 960 961 962 963 964 965 966 967 968 969 970 971 972 973

		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);
		__kick_requests(osdc, osd);
	}

	/*
	 * 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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974
		if (time_before(jiffies, req->r_stamp + keepalive))
975 976 977 978 979
			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
980
		     req->r_tid, osd->o_osd);
981 982 983 984 985 986
		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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987 988 989
		ceph_con_keepalive(&osd->o_con);
	}

990
	__schedule_osd_timeout(osdc);
S
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991 992 993 994 995
	mutex_unlock(&osdc->request_mutex);

	up_read(&osdc->map_sem);
}

996 997 998 999 1000 1001
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 =
1002
		osdc->client->options->osd_idle_ttl * HZ >> 2;
1003 1004 1005 1006 1007 1008 1009 1010 1011 1012

	dout("osds timeout\n");
	down_read(&osdc->map_sem);
	remove_old_osds(osdc, 0);
	up_read(&osdc->map_sem);

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

S
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1013 1014 1015 1016
/*
 * handle osd op reply.  either call the callback if it is specified,
 * or do the completion to wake up the waiting thread.
 */
1017 1018
static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
			 struct ceph_connection *con)
S
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1019 1020 1021 1022 1023
{
	struct ceph_osd_reply_head *rhead = msg->front.iov_base;
	struct ceph_osd_request *req;
	u64 tid;
	int numops, object_len, flags;
1024
	s32 result;
S
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1025

1026
	tid = le64_to_cpu(msg->hdr.tid);
S
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1027 1028 1029 1030
	if (msg->front.iov_len < sizeof(*rhead))
		goto bad;
	numops = le32_to_cpu(rhead->num_ops);
	object_len = le32_to_cpu(rhead->object_len);
1031
	result = le32_to_cpu(rhead->result);
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1032 1033 1034
	if (msg->front.iov_len != sizeof(*rhead) + object_len +
	    numops * sizeof(struct ceph_osd_op))
		goto bad;
1035
	dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
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1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047

	/* 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);

1048
	/*
1049
	 * if this connection filled our message, drop our reference now, to
1050 1051
	 * avoid a (safe but slower) revoke later.
	 */
1052
	if (req->r_con_filling_msg == con && req->r_reply == msg) {
S
Sage Weil 已提交
1053
		dout(" dropping con_filling_msg ref %p\n", con);
1054
		req->r_con_filling_msg = NULL;
1055 1056 1057
		ceph_con_put(con);
	}

S
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1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073
	if (!req->r_got_reply) {
		unsigned bytes;

		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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1074
		mutex_unlock(&osdc->request_mutex);
S
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1075 1076 1077 1078 1079 1080
		goto done;
	}

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

	/* either this is a read, or we got the safe response */
1081 1082
	if (result < 0 ||
	    (flags & CEPH_OSD_FLAG_ONDISK) ||
S
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1083 1084 1085 1086 1087 1088 1089 1090
	    ((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
1091
		complete_all(&req->r_completion);
S
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1092 1093 1094 1095

	if (flags & CEPH_OSD_FLAG_ONDISK) {
		if (req->r_safe_callback)
			req->r_safe_callback(req, msg);
1096
		complete_all(&req->r_safe_completion);  /* fsync waiter */
S
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1097 1098 1099 1100 1101 1102 1103 1104 1105 1106
	}

done:
	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));
1107
	ceph_msg_dump(msg);
S
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1108 1109 1110
}


1111
static int __kick_requests(struct ceph_osd_client *osdc,
S
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1112 1113 1114 1115 1116 1117 1118 1119
			  struct ceph_osd *kickosd)
{
	struct ceph_osd_request *req;
	struct rb_node *p, *n;
	int needmap = 0;
	int err;

	dout("kick_requests osd%d\n", kickosd ? kickosd->o_osd : -1);
1120
	if (kickosd) {
1121 1122 1123
		err = __reset_osd(osdc, kickosd);
		if (err == -EAGAIN)
			return 1;
1124
	} else {
S
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1125 1126 1127 1128 1129 1130
		for (p = rb_first(&osdc->osds); p; p = n) {
			struct ceph_osd *osd =
				rb_entry(p, struct ceph_osd, o_node);

			n = rb_next(p);
			if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
S
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1131 1132 1133 1134
			    memcmp(&osd->o_con.peer_addr,
				   ceph_osd_addr(osdc->osdmap,
						 osd->o_osd),
				   sizeof(struct ceph_entity_addr)) != 0)
1135
				__reset_osd(osdc, osd);
S
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1136 1137 1138 1139 1140 1141 1142 1143
		}
	}

	for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
		req = rb_entry(p, struct ceph_osd_request, r_node);

		if (req->r_resend) {
			dout(" r_resend set on tid %llu\n", req->r_tid);
1144
			__cancel_request(req);
S
Sage Weil 已提交
1145 1146
			goto kick;
		}
1147 1148
		if (req->r_osd && kickosd == req->r_osd) {
			__cancel_request(req);
S
Sage Weil 已提交
1149
			goto kick;
1150
		}
S
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1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172

		err = __map_osds(osdc, req);
		if (err == 0)
			continue;  /* no change */
		if (err < 0) {
			/*
			 * FIXME: really, we should set the request
			 * error and fail if this isn't a 'nofail'
			 * request, but that's a fair bit more
			 * complicated to do.  So retry!
			 */
			dout(" setting r_resend on %llu\n", req->r_tid);
			req->r_resend = true;
			continue;
		}
		if (req->r_osd == NULL) {
			dout("tid %llu maps to no valid osd\n", req->r_tid);
			needmap++;  /* request a newer map */
			continue;
		}

kick:
S
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1173
		dout("kicking %p tid %llu osd%d\n", req, req->r_tid,
1174
		     req->r_osd ? req->r_osd->o_osd : -1);
S
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1175 1176 1177 1178 1179 1180 1181
		req->r_flags |= CEPH_OSD_FLAG_RETRY;
		err = __send_request(osdc, req);
		if (err) {
			dout(" setting r_resend on %llu\n", req->r_tid);
			req->r_resend = true;
		}
	}
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203

	return needmap;
}

/*
 * Resubmit osd requests whose osd or osd address has changed.  Request
 * a new osd map if osds are down, or we are otherwise unable to determine
 * how to direct a request.
 *
 * Close connections to down osds.
 *
 * If @who is specified, resubmit requests for that specific osd.
 *
 * Caller should hold map_sem for read and request_mutex.
 */
static void kick_requests(struct ceph_osd_client *osdc,
			  struct ceph_osd *kickosd)
{
	int needmap;

	mutex_lock(&osdc->request_mutex);
	needmap = __kick_requests(osdc, kickosd);
S
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1204 1205 1206 1207 1208 1209 1210
	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);
	}

1211
}
S
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1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
/*
 * 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));
1235 1236
	if (ceph_check_fsid(osdc->client, &fsid) < 0)
		return;
S
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1237 1238 1239 1240 1241 1242 1243 1244

	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);
1245 1246
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258
		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,
							  osdc->client->msgr);
			if (IS_ERR(newmap)) {
				err = PTR_ERR(newmap);
				goto bad;
			}
1259
			BUG_ON(!newmap);
S
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1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278
			if (newmap != osdc->osdmap) {
				ceph_osdmap_destroy(osdc->osdmap);
				osdc->osdmap = newmap;
			}
		} 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);
1279 1280
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
		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 {
			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;
			}
1296
			BUG_ON(!newmap);
S
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1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311
			oldmap = osdc->osdmap;
			osdc->osdmap = newmap;
			if (oldmap)
				ceph_osdmap_destroy(oldmap);
		}
		p += maplen;
		nr_maps--;
	}

done:
	downgrade_write(&osdc->map_sem);
	ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
	if (newmap)
		kick_requests(osdc, NULL);
	up_read(&osdc->map_sem);
1312
	wake_up_all(&osdc->client->auth_wq);
S
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1313 1314 1315 1316
	return;

bad:
	pr_err("osdc handle_map corrupt msg\n");
1317
	ceph_msg_dump(msg);
S
Sage Weil 已提交
1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328
	up_write(&osdc->map_sem);
	return;
}

/*
 * Register request, send initial attempt.
 */
int ceph_osdc_start_request(struct ceph_osd_client *osdc,
			    struct ceph_osd_request *req,
			    bool nofail)
{
S
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1329
	int rc = 0;
S
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1330 1331 1332

	req->r_request->pages = req->r_pages;
	req->r_request->nr_pages = req->r_num_pages;
1333 1334 1335 1336
#ifdef CONFIG_BLOCK
	req->r_request->bio = req->r_bio;
#endif
	req->r_request->trail = req->r_trail;
S
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1337 1338 1339 1340 1341

	register_request(osdc, req);

	down_read(&osdc->map_sem);
	mutex_lock(&osdc->request_mutex);
S
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1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357
	/*
	 * 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) {
		rc = __send_request(osdc, req);
		if (rc) {
			if (nofail) {
				dout("osdc_start_request failed send, "
				     " marking %lld\n", req->r_tid);
				req->r_resend = true;
				rc = 0;
			} else {
				__unregister_request(osdc, req);
			}
S
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1358 1359 1360 1361 1362 1363
		}
	}
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
	return rc;
}
1364
EXPORT_SYMBOL(ceph_osdc_start_request);
S
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1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377

/*
 * 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);
1378
		__unregister_request(osdc, req);
S
Sage Weil 已提交
1379
		mutex_unlock(&osdc->request_mutex);
1380
		dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
S
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1381 1382 1383 1384 1385 1386
		return rc;
	}

	dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
	return req->r_result;
}
1387
EXPORT_SYMBOL(ceph_osdc_wait_request);
S
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1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420

/*
 * 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);
}
1421
EXPORT_SYMBOL(ceph_osdc_sync);
S
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1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438

/*
 * 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;
1439
	INIT_LIST_HEAD(&osdc->osd_lru);
S
Sage Weil 已提交
1440
	osdc->requests = RB_ROOT;
1441
	INIT_LIST_HEAD(&osdc->req_lru);
S
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1442 1443
	osdc->num_requests = 0;
	INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1444 1445 1446
	INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);

	schedule_delayed_work(&osdc->osds_timeout_work,
1447
	   round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
S
Sage Weil 已提交
1448

1449
	err = -ENOMEM;
S
Sage Weil 已提交
1450 1451 1452
	osdc->req_mempool = mempool_create_kmalloc_pool(10,
					sizeof(struct ceph_osd_request));
	if (!osdc->req_mempool)
1453
		goto out;
S
Sage Weil 已提交
1454

1455 1456
	err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true,
				"osd_op");
S
Sage Weil 已提交
1457
	if (err < 0)
1458
		goto out_mempool;
S
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1459
	err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1460 1461
				OSD_OPREPLY_FRONT_LEN, 10, true,
				"osd_op_reply");
S
Sage Weil 已提交
1462 1463
	if (err < 0)
		goto out_msgpool;
S
Sage Weil 已提交
1464
	return 0;
1465

S
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1466 1467
out_msgpool:
	ceph_msgpool_destroy(&osdc->msgpool_op);
1468 1469 1470 1471
out_mempool:
	mempool_destroy(osdc->req_mempool);
out:
	return err;
S
Sage Weil 已提交
1472
}
1473
EXPORT_SYMBOL(ceph_osdc_init);
S
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1474 1475 1476 1477

void ceph_osdc_stop(struct ceph_osd_client *osdc)
{
	cancel_delayed_work_sync(&osdc->timeout_work);
1478
	cancel_delayed_work_sync(&osdc->osds_timeout_work);
S
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1479 1480 1481 1482
	if (osdc->osdmap) {
		ceph_osdmap_destroy(osdc->osdmap);
		osdc->osdmap = NULL;
	}
1483
	remove_old_osds(osdc, 1);
S
Sage Weil 已提交
1484 1485
	mempool_destroy(osdc->req_mempool);
	ceph_msgpool_destroy(&osdc->msgpool_op);
S
Sage Weil 已提交
1486
	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
S
Sage Weil 已提交
1487
}
1488
EXPORT_SYMBOL(ceph_osdc_stop);
S
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1489 1490 1491 1492 1493 1494 1495 1496 1497

/*
 * 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,
1498
			struct page **pages, int num_pages, int page_align)
S
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1499 1500 1501 1502 1503 1504 1505 1506 1507
{
	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,
1508
				    false, 1, page_align);
1509 1510
	if (!req)
		return -ENOMEM;
S
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1511 1512 1513 1514

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

1515 1516
	dout("readpages  final extent is %llu~%llu (%d pages align %d)\n",
	     off, *plen, req->r_num_pages, page_align);
S
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1517 1518 1519 1520 1521 1522 1523 1524 1525

	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;
}
1526
EXPORT_SYMBOL(ceph_osdc_readpages);
S
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1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541

/*
 * 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;
1542
	int page_align = off & ~PAGE_MASK;
S
Sage Weil 已提交
1543 1544 1545 1546 1547 1548 1549 1550

	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,
1551
				    nofail, 1, page_align);
1552 1553
	if (!req)
		return -ENOMEM;
S
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1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569

	/* 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;
}
1570
EXPORT_SYMBOL(ceph_osdc_writepages);
S
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1571 1572 1573 1574 1575 1576 1577

/*
 * handle incoming message
 */
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
{
	struct ceph_osd *osd = con->private;
1578
	struct ceph_osd_client *osdc;
S
Sage Weil 已提交
1579 1580 1581
	int type = le16_to_cpu(msg->hdr.type);

	if (!osd)
S
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1582
		goto out;
1583
	osdc = osd->o_osdc;
S
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1584 1585 1586 1587 1588 1589

	switch (type) {
	case CEPH_MSG_OSD_MAP:
		ceph_osdc_handle_map(osdc, msg);
		break;
	case CEPH_MSG_OSD_OPREPLY:
1590
		handle_reply(osdc, msg, con);
S
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1591 1592 1593 1594 1595 1596
		break;

	default:
		pr_err("received unknown message type %d %s\n", type,
		       ceph_msg_type_name(type));
	}
S
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1597
out:
S
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1598 1599 1600
	ceph_msg_put(msg);
}

1601
/*
1602 1603
 * lookup and return message for incoming reply.  set up reply message
 * pages.
1604 1605
 */
static struct ceph_msg *get_reply(struct ceph_connection *con,
1606 1607
				  struct ceph_msg_header *hdr,
				  int *skip)
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{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc = osd->o_osdc;
1611
	struct ceph_msg *m;
1612
	struct ceph_osd_request *req;
1613 1614
	int front = le32_to_cpu(hdr->front_len);
	int data_len = le32_to_cpu(hdr->data_len);
1615
	u64 tid;
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1617 1618 1619 1620 1621 1622
	tid = le64_to_cpu(hdr->tid);
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (!req) {
		*skip = 1;
		m = NULL;
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		pr_info("get_reply unknown tid %llu from osd%d\n", tid,
1624
			osd->o_osd);
1625 1626
		goto out;
	}
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	if (req->r_con_filling_msg) {
		dout("get_reply revoking msg %p from old con %p\n",
		     req->r_reply, req->r_con_filling_msg);
		ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
		ceph_con_put(req->r_con_filling_msg);
1633
		req->r_con_filling_msg = NULL;
1634 1635
	}

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	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);
1639
		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS);
1640
		if (!m)
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			goto out;
		ceph_msg_put(req->r_reply);
		req->r_reply = m;
	}
	m = ceph_msg_get(req->r_reply);

1647
	if (data_len > 0) {
1648
		int want = calc_pages_for(req->r_page_alignment, data_len);
1649 1650 1651 1652

		if (unlikely(req->r_num_pages < want)) {
			pr_warning("tid %lld reply %d > expected %d pages\n",
				   tid, want, m->nr_pages);
1653 1654
			*skip = 1;
			ceph_msg_put(m);
1655
			m = NULL;
1656
			goto out;
1657
		}
1658 1659
		m->pages = req->r_pages;
		m->nr_pages = req->r_num_pages;
1660 1661 1662
#ifdef CONFIG_BLOCK
		m->bio = req->r_bio;
#endif
1663
	}
1664
	*skip = 0;
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	req->r_con_filling_msg = ceph_con_get(con);
	dout("get_reply tid %lld %p\n", tid, m);
1667 1668 1669

out:
	mutex_unlock(&osdc->request_mutex);
1670
	return m;
1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683

}

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);

	switch (type) {
	case CEPH_MSG_OSD_MAP:
1684
		return ceph_msg_new(type, front, GFP_NOFS);
1685 1686 1687 1688 1689 1690 1691 1692
	case CEPH_MSG_OSD_OPREPLY:
		return get_reply(con, hdr, skip);
	default:
		pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
			osd->o_osd);
		*skip = 1;
		return NULL;
	}
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}

/*
 * 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);
}

1712 1713 1714 1715
/*
 * authentication
 */
static int get_authorizer(struct ceph_connection *con,
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1716 1717
			  void **buf, int *len, int *proto,
			  void **reply_buf, int *reply_len, int force_new)
1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;
	int ret = 0;

	if (force_new && o->o_authorizer) {
		ac->ops->destroy_authorizer(ac, o->o_authorizer);
		o->o_authorizer = NULL;
	}
	if (o->o_authorizer == NULL) {
		ret = ac->ops->create_authorizer(
			ac, CEPH_ENTITY_TYPE_OSD,
			&o->o_authorizer,
			&o->o_authorizer_buf,
			&o->o_authorizer_buf_len,
			&o->o_authorizer_reply_buf,
			&o->o_authorizer_reply_buf_len);
		if (ret)
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			return ret;
1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757
	}

	*proto = ac->protocol;
	*buf = o->o_authorizer_buf;
	*len = o->o_authorizer_buf_len;
	*reply_buf = o->o_authorizer_reply_buf;
	*reply_len = o->o_authorizer_reply_buf_len;
	return 0;
}


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;

	return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
}

1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768
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;

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

	return ceph_monc_validate_auth(&osdc->client->monc);
}
1769

1770
static const struct ceph_connection_operations osd_con_ops = {
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1771 1772 1773
	.get = get_osd_con,
	.put = put_osd_con,
	.dispatch = dispatch,
1774 1775
	.get_authorizer = get_authorizer,
	.verify_authorizer_reply = verify_authorizer_reply,
1776
	.invalidate_authorizer = invalidate_authorizer,
S
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	.alloc_msg = alloc_msg,
1778
	.fault = osd_reset,
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};