osd_client.c 75.4 KB
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#include <linux/ceph/ceph_debug.h>
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#include <linux/module.h>
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#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
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#ifdef CONFIG_BLOCK
#include <linux/bio.h>
#endif
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#include <linux/ceph/libceph.h>
#include <linux/ceph/osd_client.h>
#include <linux/ceph/messenger.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/auth.h>
#include <linux/ceph/pagelist.h>
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#define OSD_OP_FRONT_LEN	4096
#define OSD_OPREPLY_FRONT_LEN	512
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static struct kmem_cache	*ceph_osd_request_cache;

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static const struct ceph_connection_operations osd_con_ops;
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static void __send_queued(struct ceph_osd_client *osdc);
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static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
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static void __register_request(struct ceph_osd_client *osdc,
			       struct ceph_osd_request *req);
static void __unregister_linger_request(struct ceph_osd_client *osdc,
					struct ceph_osd_request *req);
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static void __send_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req);
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/*
 * Implement client access to distributed object storage cluster.
 *
 * All data objects are stored within a cluster/cloud of OSDs, or
 * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
 * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
 * remote daemons serving up and coordinating consistent and safe
 * access to storage.
 *
 * Cluster membership and the mapping of data objects onto storage devices
 * are described by the osd map.
 *
 * We keep track of pending OSD requests (read, write), resubmit
 * requests to different OSDs when the cluster topology/data layout
 * change, or retry the affected requests when the communications
 * channel with an OSD is reset.
 */

/*
 * calculate the mapping of a file extent onto an object, and fill out the
 * request accordingly.  shorten extent as necessary if it crosses an
 * object boundary.
 *
 * fill osd op in request message.
 */
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static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
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			u64 *objnum, u64 *objoff, u64 *objlen)
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{
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	u64 orig_len = *plen;
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	int r;
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	/* object extent? */
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	r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
					  objoff, objlen);
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	if (r < 0)
		return r;
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	if (*objlen < orig_len) {
		*plen = *objlen;
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		dout(" skipping last %llu, final file extent %llu~%llu\n",
		     orig_len - *plen, off, *plen);
	}

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	dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
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	return 0;
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}

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static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
{
	memset(osd_data, 0, sizeof (*osd_data));
	osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
}

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static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
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			struct page **pages, u64 length, u32 alignment,
			bool pages_from_pool, bool own_pages)
{
	osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
	osd_data->pages = pages;
	osd_data->length = length;
	osd_data->alignment = alignment;
	osd_data->pages_from_pool = pages_from_pool;
	osd_data->own_pages = own_pages;
}

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static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
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			struct ceph_pagelist *pagelist)
{
	osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
	osd_data->pagelist = pagelist;
}

#ifdef CONFIG_BLOCK
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static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
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			struct bio *bio, size_t bio_length)
{
	osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
	osd_data->bio = bio;
	osd_data->bio_length = bio_length;
}
#endif /* CONFIG_BLOCK */

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#define osd_req_op_data(oreq, whch, typ, fld)	\
	({						\
		BUG_ON(whch >= (oreq)->r_num_ops);	\
		&(oreq)->r_ops[whch].typ.fld;		\
	})

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static struct ceph_osd_data *
osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
{
	BUG_ON(which >= osd_req->r_num_ops);

	return &osd_req->r_ops[which].raw_data_in;
}

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struct ceph_osd_data *
osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
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			unsigned int which)
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{
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	return osd_req_op_data(osd_req, which, extent, osd_data);
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}
EXPORT_SYMBOL(osd_req_op_extent_osd_data);

struct ceph_osd_data *
osd_req_op_cls_response_data(struct ceph_osd_request *osd_req,
			unsigned int which)
{
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	return osd_req_op_data(osd_req, which, cls, response_data);
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}
EXPORT_SYMBOL(osd_req_op_cls_response_data);	/* ??? */

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void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
			unsigned int which, struct page **pages,
			u64 length, u32 alignment,
			bool pages_from_pool, bool own_pages)
{
	struct ceph_osd_data *osd_data;

	osd_data = osd_req_op_raw_data_in(osd_req, which);
	ceph_osd_data_pages_init(osd_data, pages, length, alignment,
				pages_from_pool, own_pages);
}
EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);

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void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
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			unsigned int which, struct page **pages,
			u64 length, u32 alignment,
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			bool pages_from_pool, bool own_pages)
{
	struct ceph_osd_data *osd_data;

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	osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
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	ceph_osd_data_pages_init(osd_data, pages, length, alignment,
				pages_from_pool, own_pages);
}
EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);

void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
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			unsigned int which, struct ceph_pagelist *pagelist)
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{
	struct ceph_osd_data *osd_data;

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	osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
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	ceph_osd_data_pagelist_init(osd_data, pagelist);
}
EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);

#ifdef CONFIG_BLOCK
void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
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			unsigned int which, struct bio *bio, size_t bio_length)
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{
	struct ceph_osd_data *osd_data;
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	osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
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	ceph_osd_data_bio_init(osd_data, bio, bio_length);
}
EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
#endif /* CONFIG_BLOCK */

static void osd_req_op_cls_request_info_pagelist(
			struct ceph_osd_request *osd_req,
			unsigned int which, struct ceph_pagelist *pagelist)
{
	struct ceph_osd_data *osd_data;

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	osd_data = osd_req_op_data(osd_req, which, cls, request_info);
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	ceph_osd_data_pagelist_init(osd_data, pagelist);
}

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void osd_req_op_cls_request_data_pagelist(
			struct ceph_osd_request *osd_req,
			unsigned int which, struct ceph_pagelist *pagelist)
{
	struct ceph_osd_data *osd_data;

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	osd_data = osd_req_op_data(osd_req, which, cls, request_data);
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	ceph_osd_data_pagelist_init(osd_data, pagelist);
}
EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);

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void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
			unsigned int which, struct page **pages, u64 length,
			u32 alignment, bool pages_from_pool, bool own_pages)
{
	struct ceph_osd_data *osd_data;

	osd_data = osd_req_op_data(osd_req, which, cls, request_data);
	ceph_osd_data_pages_init(osd_data, pages, length, alignment,
				pages_from_pool, own_pages);
}
EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);

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void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
			unsigned int which, struct page **pages, u64 length,
			u32 alignment, bool pages_from_pool, bool own_pages)
{
	struct ceph_osd_data *osd_data;

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	osd_data = osd_req_op_data(osd_req, which, cls, response_data);
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	ceph_osd_data_pages_init(osd_data, pages, length, alignment,
				pages_from_pool, own_pages);
}
EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);

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static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
{
	switch (osd_data->type) {
	case CEPH_OSD_DATA_TYPE_NONE:
		return 0;
	case CEPH_OSD_DATA_TYPE_PAGES:
		return osd_data->length;
	case CEPH_OSD_DATA_TYPE_PAGELIST:
		return (u64)osd_data->pagelist->length;
#ifdef CONFIG_BLOCK
	case CEPH_OSD_DATA_TYPE_BIO:
		return (u64)osd_data->bio_length;
#endif /* CONFIG_BLOCK */
	default:
		WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
		return 0;
	}
}

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static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
{
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	if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
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		int num_pages;

		num_pages = calc_pages_for((u64)osd_data->alignment,
						(u64)osd_data->length);
		ceph_release_page_vector(osd_data->pages, num_pages);
	}
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	ceph_osd_data_init(osd_data);
}

static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
			unsigned int which)
{
	struct ceph_osd_req_op *op;

	BUG_ON(which >= osd_req->r_num_ops);
	op = &osd_req->r_ops[which];

	switch (op->op) {
	case CEPH_OSD_OP_READ:
	case CEPH_OSD_OP_WRITE:
		ceph_osd_data_release(&op->extent.osd_data);
		break;
	case CEPH_OSD_OP_CALL:
		ceph_osd_data_release(&op->cls.request_info);
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		ceph_osd_data_release(&op->cls.request_data);
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		ceph_osd_data_release(&op->cls.response_data);
		break;
	default:
		break;
	}
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}

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/*
 * requests
 */
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void ceph_osdc_release_request(struct kref *kref)
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{
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	struct ceph_osd_request *req;
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	unsigned int which;
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	req = container_of(kref, struct ceph_osd_request, r_kref);
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	if (req->r_request)
		ceph_msg_put(req->r_request);
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	if (req->r_reply) {
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		ceph_msg_revoke_incoming(req->r_reply);
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		ceph_msg_put(req->r_reply);
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	}
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	for (which = 0; which < req->r_num_ops; which++)
		osd_req_op_data_release(req, which);
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	ceph_put_snap_context(req->r_snapc);
	if (req->r_mempool)
		mempool_free(req, req->r_osdc->req_mempool);
	else
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		kmem_cache_free(ceph_osd_request_cache, req);

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}
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EXPORT_SYMBOL(ceph_osdc_release_request);
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struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
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					       struct ceph_snap_context *snapc,
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					       unsigned int num_ops,
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					       bool use_mempool,
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					       gfp_t gfp_flags)
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{
	struct ceph_osd_request *req;
	struct ceph_msg *msg;
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	size_t msg_size;

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	BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX);
	BUG_ON(num_ops > CEPH_OSD_MAX_OP);

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	msg_size = 4 + 4 + 8 + 8 + 4+8;
	msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
	msg_size += 1 + 8 + 4 + 4;     /* pg_t */
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	msg_size += 4 + CEPH_MAX_OID_NAME_LEN; /* oid */
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	msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
	msg_size += 8;  /* snapid */
	msg_size += 8;  /* snap_seq */
	msg_size += 8 * (snapc ? snapc->num_snaps : 0);  /* snaps */
	msg_size += 4;
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	if (use_mempool) {
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		req = mempool_alloc(osdc->req_mempool, gfp_flags);
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		memset(req, 0, sizeof(*req));
	} else {
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		req = kmem_cache_zalloc(ceph_osd_request_cache, 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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	req->r_num_ops = num_ops;
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	kref_init(&req->r_kref);
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	init_completion(&req->r_completion);
	init_completion(&req->r_safe_completion);
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	RB_CLEAR_NODE(&req->r_node);
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	INIT_LIST_HEAD(&req->r_unsafe_item);
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	INIT_LIST_HEAD(&req->r_linger_item);
	INIT_LIST_HEAD(&req->r_linger_osd);
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	INIT_LIST_HEAD(&req->r_req_lru_item);
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	INIT_LIST_HEAD(&req->r_osd_item);

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	req->r_base_oloc.pool = -1;
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	req->r_target_oloc.pool = -1;
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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;

	/* create request message; allow space for oid */
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	if (use_mempool)
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		msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
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	else
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		msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
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	if (!msg) {
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		ceph_osdc_put_request(req);
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		return NULL;
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	}
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	memset(msg->front.iov_base, 0, msg->front.iov_len);
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	req->r_request = msg;

	return req;
}
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EXPORT_SYMBOL(ceph_osdc_alloc_request);
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static bool osd_req_opcode_valid(u16 opcode)
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{
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	switch (opcode) {
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	case CEPH_OSD_OP_READ:
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	case CEPH_OSD_OP_STAT:
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	case CEPH_OSD_OP_MAPEXT:
	case CEPH_OSD_OP_MASKTRUNC:
	case CEPH_OSD_OP_SPARSE_READ:
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	case CEPH_OSD_OP_NOTIFY:
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	case CEPH_OSD_OP_NOTIFY_ACK:
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	case CEPH_OSD_OP_ASSERT_VER:
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	case CEPH_OSD_OP_WRITE:
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	case CEPH_OSD_OP_WRITEFULL:
	case CEPH_OSD_OP_TRUNCATE:
	case CEPH_OSD_OP_ZERO:
	case CEPH_OSD_OP_DELETE:
	case CEPH_OSD_OP_APPEND:
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	case CEPH_OSD_OP_STARTSYNC:
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	case CEPH_OSD_OP_SETTRUNC:
	case CEPH_OSD_OP_TRIMTRUNC:
	case CEPH_OSD_OP_TMAPUP:
	case CEPH_OSD_OP_TMAPPUT:
	case CEPH_OSD_OP_TMAPGET:
	case CEPH_OSD_OP_CREATE:
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	case CEPH_OSD_OP_ROLLBACK:
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	case CEPH_OSD_OP_WATCH:
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	case CEPH_OSD_OP_OMAPGETKEYS:
	case CEPH_OSD_OP_OMAPGETVALS:
	case CEPH_OSD_OP_OMAPGETHEADER:
	case CEPH_OSD_OP_OMAPGETVALSBYKEYS:
	case CEPH_OSD_OP_OMAPSETVALS:
	case CEPH_OSD_OP_OMAPSETHEADER:
	case CEPH_OSD_OP_OMAPCLEAR:
	case CEPH_OSD_OP_OMAPRMKEYS:
	case CEPH_OSD_OP_OMAP_CMP:
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	case CEPH_OSD_OP_SETALLOCHINT:
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	case CEPH_OSD_OP_CLONERANGE:
	case CEPH_OSD_OP_ASSERT_SRC_VERSION:
	case CEPH_OSD_OP_SRC_CMPXATTR:
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	case CEPH_OSD_OP_GETXATTR:
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	case CEPH_OSD_OP_GETXATTRS:
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	case CEPH_OSD_OP_CMPXATTR:
	case CEPH_OSD_OP_SETXATTR:
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	case CEPH_OSD_OP_SETXATTRS:
	case CEPH_OSD_OP_RESETXATTRS:
	case CEPH_OSD_OP_RMXATTR:
	case CEPH_OSD_OP_PULL:
	case CEPH_OSD_OP_PUSH:
	case CEPH_OSD_OP_BALANCEREADS:
	case CEPH_OSD_OP_UNBALANCEREADS:
	case CEPH_OSD_OP_SCRUB:
	case CEPH_OSD_OP_SCRUB_RESERVE:
	case CEPH_OSD_OP_SCRUB_UNRESERVE:
	case CEPH_OSD_OP_SCRUB_STOP:
	case CEPH_OSD_OP_SCRUB_MAP:
	case CEPH_OSD_OP_WRLOCK:
	case CEPH_OSD_OP_WRUNLOCK:
	case CEPH_OSD_OP_RDLOCK:
	case CEPH_OSD_OP_RDUNLOCK:
	case CEPH_OSD_OP_UPLOCK:
	case CEPH_OSD_OP_DNLOCK:
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	case CEPH_OSD_OP_CALL:
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	case CEPH_OSD_OP_PGLS:
	case CEPH_OSD_OP_PGLS_FILTER:
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		return true;
	default:
		return false;
	}
}

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/*
 * This is an osd op init function for opcodes that have no data or
 * other information associated with them.  It also serves as a
 * common init routine for all the other init functions, below.
 */
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static struct ceph_osd_req_op *
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_osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
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				u16 opcode)
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{
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	struct ceph_osd_req_op *op;

	BUG_ON(which >= osd_req->r_num_ops);
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	BUG_ON(!osd_req_opcode_valid(opcode));

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	op = &osd_req->r_ops[which];
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	memset(op, 0, sizeof (*op));
	op->op = opcode;
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	return op;
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}

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void osd_req_op_init(struct ceph_osd_request *osd_req,
				unsigned int which, u16 opcode)
{
	(void)_osd_req_op_init(osd_req, which, opcode);
}
EXPORT_SYMBOL(osd_req_op_init);

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void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
				unsigned int which, u16 opcode,
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				u64 offset, u64 length,
				u64 truncate_size, u32 truncate_seq)
{
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	struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
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	size_t payload_len = 0;

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	BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
	       opcode != CEPH_OSD_OP_DELETE && opcode != CEPH_OSD_OP_ZERO &&
	       opcode != CEPH_OSD_OP_TRUNCATE);
513 514 515 516 517 518 519 520 521 522 523 524

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

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

525 526
void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
				unsigned int which, u64 length)
527
{
528 529 530 531 532 533
	struct ceph_osd_req_op *op;
	u64 previous;

	BUG_ON(which >= osd_req->r_num_ops);
	op = &osd_req->r_ops[which];
	previous = op->extent.length;
534 535 536 537 538 539 540 541 542 543

	if (length == previous)
		return;		/* Nothing to do */
	BUG_ON(length > previous);

	op->extent.length = length;
	op->payload_len -= previous - length;
}
EXPORT_SYMBOL(osd_req_op_extent_update);

544
void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
545
			u16 opcode, const char *class, const char *method)
546
{
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547
	struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
548
	struct ceph_pagelist *pagelist;
549 550 551 552 553
	size_t payload_len = 0;
	size_t size;

	BUG_ON(opcode != CEPH_OSD_OP_CALL);

554 555 556 557
	pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
	BUG_ON(!pagelist);
	ceph_pagelist_init(pagelist);

558 559 560 561
	op->cls.class_name = class;
	size = strlen(class);
	BUG_ON(size > (size_t) U8_MAX);
	op->cls.class_len = size;
562
	ceph_pagelist_append(pagelist, class, size);
563 564 565 566 567 568
	payload_len += size;

	op->cls.method_name = method;
	size = strlen(method);
	BUG_ON(size > (size_t) U8_MAX);
	op->cls.method_len = size;
569
	ceph_pagelist_append(pagelist, method, size);
570 571
	payload_len += size;

572
	osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
573

574 575 576 577 578
	op->cls.argc = 0;	/* currently unused */

	op->payload_len = payload_len;
}
EXPORT_SYMBOL(osd_req_op_cls_init);
579

580 581
void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
				unsigned int which, u16 opcode,
582 583
				u64 cookie, u64 version, int flag)
{
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	struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
585

586
	BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
587 588

	op->watch.cookie = cookie;
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	op->watch.ver = version;
590
	if (opcode == CEPH_OSD_OP_WATCH && flag)
591
		op->watch.flag = (u8)1;
592 593 594
}
EXPORT_SYMBOL(osd_req_op_watch_init);

595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614
void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
				unsigned int which,
				u64 expected_object_size,
				u64 expected_write_size)
{
	struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
						      CEPH_OSD_OP_SETALLOCHINT);

	op->alloc_hint.expected_object_size = expected_object_size;
	op->alloc_hint.expected_write_size = expected_write_size;

	/*
	 * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
	 * not worth a feature bit.  Set FAILOK per-op flag to make
	 * sure older osds don't trip over an unsupported opcode.
	 */
	op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
}
EXPORT_SYMBOL(osd_req_op_alloc_hint_init);

615
static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
616 617 618 619 620 621 622
				struct ceph_osd_data *osd_data)
{
	u64 length = ceph_osd_data_length(osd_data);

	if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
		BUG_ON(length > (u64) SIZE_MAX);
		if (length)
623
			ceph_msg_data_add_pages(msg, osd_data->pages,
624 625 626
					length, osd_data->alignment);
	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
		BUG_ON(!length);
627
		ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
628 629
#ifdef CONFIG_BLOCK
	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
630
		ceph_msg_data_add_bio(msg, osd_data->bio, length);
631 632 633 634 635 636
#endif
	} else {
		BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
	}
}

637
static u64 osd_req_encode_op(struct ceph_osd_request *req,
638
			      struct ceph_osd_op *dst, unsigned int which)
639
{
640
	struct ceph_osd_req_op *src;
641
	struct ceph_osd_data *osd_data;
642
	u64 request_data_len = 0;
643
	u64 data_length;
644

645 646
	BUG_ON(which >= req->r_num_ops);
	src = &req->r_ops[which];
647 648 649 650 651 652 653 654
	if (WARN_ON(!osd_req_opcode_valid(src->op))) {
		pr_err("unrecognized osd opcode %d\n", src->op);

		return 0;
	}

	switch (src->op) {
	case CEPH_OSD_OP_STAT:
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		osd_data = &src->raw_data_in;
		ceph_osdc_msg_data_add(req->r_reply, osd_data);
657 658 659
		break;
	case CEPH_OSD_OP_READ:
	case CEPH_OSD_OP_WRITE:
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	case CEPH_OSD_OP_ZERO:
	case CEPH_OSD_OP_DELETE:
	case CEPH_OSD_OP_TRUNCATE:
663
		if (src->op == CEPH_OSD_OP_WRITE)
664
			request_data_len = src->extent.length;
665 666 667 668 669 670
		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);
671
		osd_data = &src->extent.osd_data;
672
		if (src->op == CEPH_OSD_OP_WRITE)
673
			ceph_osdc_msg_data_add(req->r_request, osd_data);
674
		else
675
			ceph_osdc_msg_data_add(req->r_reply, osd_data);
676 677 678 679
		break;
	case CEPH_OSD_OP_CALL:
		dst->cls.class_len = src->cls.class_len;
		dst->cls.method_len = src->cls.method_len;
680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695
		osd_data = &src->cls.request_info;
		ceph_osdc_msg_data_add(req->r_request, osd_data);
		BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
		request_data_len = osd_data->pagelist->length;

		osd_data = &src->cls.request_data;
		data_length = ceph_osd_data_length(osd_data);
		if (data_length) {
			BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
			dst->cls.indata_len = cpu_to_le32(data_length);
			ceph_osdc_msg_data_add(req->r_request, osd_data);
			src->payload_len += data_length;
			request_data_len += data_length;
		}
		osd_data = &src->cls.response_data;
		ceph_osdc_msg_data_add(req->r_reply, osd_data);
696 697 698 699 700 701 702 703 704
		break;
	case CEPH_OSD_OP_STARTSYNC:
		break;
	case CEPH_OSD_OP_NOTIFY_ACK:
	case CEPH_OSD_OP_WATCH:
		dst->watch.cookie = cpu_to_le64(src->watch.cookie);
		dst->watch.ver = cpu_to_le64(src->watch.ver);
		dst->watch.flag = src->watch.flag;
		break;
705 706 707 708 709 710
	case CEPH_OSD_OP_SETALLOCHINT:
		dst->alloc_hint.expected_object_size =
		    cpu_to_le64(src->alloc_hint.expected_object_size);
		dst->alloc_hint.expected_write_size =
		    cpu_to_le64(src->alloc_hint.expected_write_size);
		break;
711
	default:
712
		pr_err("unsupported osd opcode %s\n",
713
			ceph_osd_op_name(src->op));
714
		WARN_ON(1);
715 716

		return 0;
717
	}
718

719
	dst->op = cpu_to_le16(src->op);
720
	dst->flags = cpu_to_le32(src->flags);
721
	dst->payload_len = cpu_to_le32(src->payload_len);
722

723
	return request_data_len;
724 725
}

726 727 728 729 730 731 732 733 734 735 736 737 738 739
/*
 * 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,
740
					       u64 off, u64 *plen, int num_ops,
741 742 743 744
					       int opcode, int flags,
					       struct ceph_snap_context *snapc,
					       u32 truncate_seq,
					       u64 truncate_size,
745
					       bool use_mempool)
746
{
747
	struct ceph_osd_request *req;
748 749 750
	u64 objnum = 0;
	u64 objoff = 0;
	u64 objlen = 0;
751 752
	u32 object_size;
	u64 object_base;
753
	int r;
754

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	BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
	       opcode != CEPH_OSD_OP_DELETE && opcode != CEPH_OSD_OP_ZERO &&
	       opcode != CEPH_OSD_OP_TRUNCATE);
758

759
	req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
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					GFP_NOFS);
761
	if (!req)
762
		return ERR_PTR(-ENOMEM);
763

764
	req->r_flags = flags;
765 766

	/* calculate max write size */
767
	r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
768 769
	if (r < 0) {
		ceph_osdc_put_request(req);
770
		return ERR_PTR(r);
771
	}
772

773 774
	object_size = le32_to_cpu(layout->fl_object_size);
	object_base = off - objoff;
775 776 777 778 779 780 781 782
	if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
		if (truncate_size <= object_base) {
			truncate_size = 0;
		} else {
			truncate_size -= object_base;
			if (truncate_size > object_size)
				truncate_size = object_size;
		}
783
	}
784

785
	osd_req_op_extent_init(req, 0, opcode, objoff, objlen,
786
				truncate_size, truncate_seq);
787

788 789 790 791 792 793
	/*
	 * A second op in the ops array means the caller wants to
	 * also issue a include a 'startsync' command so that the
	 * osd will flush data quickly.
	 */
	if (num_ops > 1)
794
		osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC);
795

796
	req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout);
797

798
	snprintf(req->r_base_oid.name, sizeof(req->r_base_oid.name),
799
		 "%llx.%08llx", vino.ino, objnum);
800
	req->r_base_oid.name_len = strlen(req->r_base_oid.name);
801

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	return req;
}
804
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;
}

871 872 873 874 875 876
/*
 * Resubmit requests pending on the given osd.
 */
static void __kick_osd_requests(struct ceph_osd_client *osdc,
				struct ceph_osd *osd)
{
877
	struct ceph_osd_request *req, *nreq;
878
	LIST_HEAD(resend);
879 880 881 882
	int err;

	dout("__kick_osd_requests osd%d\n", osd->o_osd);
	err = __reset_osd(osdc, osd);
883
	if (err)
884
		return;
885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901
	/*
	 * Build up a list of requests to resend by traversing the
	 * osd's list of requests.  Requests for a given object are
	 * sent in tid order, and that is also the order they're
	 * kept on this list.  Therefore all requests that are in
	 * flight will be found first, followed by all requests that
	 * have not yet been sent.  And to resend requests while
	 * preserving this order we will want to put any sent
	 * requests back on the front of the osd client's unsent
	 * list.
	 *
	 * So we build a separate ordered list of already-sent
	 * requests for the affected osd and splice it onto the
	 * front of the osd client's unsent list.  Once we've seen a
	 * request that has not yet been sent we're done.  Those
	 * requests are already sitting right where they belong.
	 */
902
	list_for_each_entry(req, &osd->o_requests, r_osd_item) {
903 904 905 906
		if (!req->r_sent)
			break;
		list_move_tail(&req->r_req_lru_item, &resend);
		dout("requeueing %p tid %llu osd%d\n", req, req->r_tid,
907
		     osd->o_osd);
908 909 910
		if (!req->r_linger)
			req->r_flags |= CEPH_OSD_FLAG_RETRY;
	}
911
	list_splice(&resend, &osdc->req_unsent);
912

913 914 915 916 917
	/*
	 * Linger requests are re-registered before sending, which
	 * sets up a new tid for each.  We add them to the unsent
	 * list at the end to keep things in tid order.
	 */
918 919
	list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
				 r_linger_osd) {
920 921 922 923 924
		/*
		 * reregister request prior to unregistering linger so
		 * that r_osd is preserved.
		 */
		BUG_ON(!list_empty(&req->r_req_lru_item));
925
		__register_request(osdc, req);
926
		list_add_tail(&req->r_req_lru_item, &osdc->req_unsent);
927
		list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
928
		__unregister_linger_request(osdc, req);
929 930
		dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
		     osd->o_osd);
931 932 933
	}
}

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934
/*
935
 * If the osd connection drops, we need to resubmit all requests.
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936 937 938 939 940 941 942 943 944 945 946
 */
static void osd_reset(struct ceph_connection *con)
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc;

	if (!osd)
		return;
	dout("osd_reset osd%d\n", osd->o_osd);
	osdc = osd->o_osdc;
	down_read(&osdc->map_sem);
S
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947 948
	mutex_lock(&osdc->request_mutex);
	__kick_osd_requests(osdc, osd);
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	__send_queued(osdc);
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950
	mutex_unlock(&osdc->request_mutex);
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951 952 953 954 955 956
	up_read(&osdc->map_sem);
}

/*
 * Track open sessions with osds.
 */
957
static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
S
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958 959 960 961 962 963 964 965 966
{
	struct ceph_osd *osd;

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

	atomic_set(&osd->o_ref, 1);
	osd->o_osdc = osdc;
967
	osd->o_osd = onum;
968
	RB_CLEAR_NODE(&osd->o_node);
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969
	INIT_LIST_HEAD(&osd->o_requests);
970
	INIT_LIST_HEAD(&osd->o_linger_requests);
971
	INIT_LIST_HEAD(&osd->o_osd_lru);
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972 973
	osd->o_incarnation = 1;

974
	ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
975

976
	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);
996
	if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
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997 998
		struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;

999
		ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
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1000
		kfree(osd);
S
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1001
	}
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1002 1003 1004 1005 1006
}

/*
 * remove an osd from our map
 */
1007
static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
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1008
{
1009
	dout("__remove_osd %p\n", osd);
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1010 1011
	BUG_ON(!list_empty(&osd->o_requests));
	rb_erase(&osd->o_node, &osdc->osds);
1012
	list_del_init(&osd->o_osd_lru);
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1013 1014 1015 1016
	ceph_con_close(&osd->o_con);
	put_osd(osd);
}

1017 1018
static void remove_all_osds(struct ceph_osd_client *osdc)
{
1019
	dout("%s %p\n", __func__, osdc);
1020 1021 1022 1023 1024 1025 1026 1027 1028
	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);
}

1029 1030 1031 1032 1033 1034
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);
1035
	osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
1036 1037 1038 1039 1040 1041 1042 1043 1044
}

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);
}

1045
static void remove_old_osds(struct ceph_osd_client *osdc)
1046 1047 1048 1049 1050 1051
{
	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) {
1052
		if (time_before(jiffies, osd->lru_ttl))
1053 1054 1055 1056 1057 1058
			break;
		__remove_osd(osdc, osd);
	}
	mutex_unlock(&osdc->request_mutex);
}

S
Sage Weil 已提交
1059 1060 1061
/*
 * reset osd connect
 */
1062
static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
S
Sage Weil 已提交
1063
{
A
Alex Elder 已提交
1064
	struct ceph_entity_addr *peer_addr;
S
Sage Weil 已提交
1065

1066
	dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1067 1068
	if (list_empty(&osd->o_requests) &&
	    list_empty(&osd->o_linger_requests)) {
1069
		__remove_osd(osdc, osd);
A
Alex Elder 已提交
1070 1071 1072 1073 1074 1075 1076 1077 1078

		return -ENODEV;
	}

	peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
	if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
			!ceph_con_opened(&osd->o_con)) {
		struct ceph_osd_request *req;

1079 1080
		dout("osd addr hasn't changed and connection never opened, "
		     "letting msgr retry\n");
1081 1082 1083
		/* touch each r_stamp for handle_timeout()'s benfit */
		list_for_each_entry(req, &osd->o_requests, r_osd_item)
			req->r_stamp = jiffies;
A
Alex Elder 已提交
1084 1085

		return -EAGAIN;
S
Sage Weil 已提交
1086
	}
A
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1087 1088 1089 1090 1091 1092

	ceph_con_close(&osd->o_con);
	ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
	osd->o_incarnation++;

	return 0;
S
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1093 1094 1095 1096 1097 1098 1099 1100
}

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;

1101
	dout("__insert_osd %p osd%d\n", new, new->o_osd);
S
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1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133
	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;
}

1134 1135 1136
static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
{
	schedule_delayed_work(&osdc->timeout_work,
1137
			osdc->client->options->osd_keepalive_timeout * HZ);
1138 1139 1140 1141 1142 1143
}

static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
{
	cancel_delayed_work(&osdc->timeout_work);
}
S
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1144 1145 1146 1147 1148

/*
 * Register request, assign tid.  If this is the first request, set up
 * the timeout event.
 */
1149 1150
static void __register_request(struct ceph_osd_client *osdc,
			       struct ceph_osd_request *req)
S
Sage Weil 已提交
1151 1152
{
	req->r_tid = ++osdc->last_tid;
1153
	req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1154
	dout("__register_request %p tid %lld\n", req, req->r_tid);
S
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1155 1156 1157 1158
	__insert_request(osdc, req);
	ceph_osdc_get_request(req);
	osdc->num_requests++;
	if (osdc->num_requests == 1) {
1159 1160
		dout(" first request, scheduling timeout\n");
		__schedule_osd_timeout(osdc);
S
Sage Weil 已提交
1161
	}
1162 1163
}

S
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1164 1165 1166 1167 1168 1169
/*
 * called under osdc->request_mutex
 */
static void __unregister_request(struct ceph_osd_client *osdc,
				 struct ceph_osd_request *req)
{
1170 1171 1172 1173 1174 1175
	if (RB_EMPTY_NODE(&req->r_node)) {
		dout("__unregister_request %p tid %lld not registered\n",
			req, req->r_tid);
		return;
	}

S
Sage Weil 已提交
1176 1177 1178 1179
	dout("__unregister_request %p tid %lld\n", req, req->r_tid);
	rb_erase(&req->r_node, &osdc->requests);
	osdc->num_requests--;

1180 1181
	if (req->r_osd) {
		/* make sure the original request isn't in flight. */
1182
		ceph_msg_revoke(req->r_request);
1183 1184

		list_del_init(&req->r_osd_item);
1185 1186 1187
		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);
1188
			__move_osd_to_lru(osdc, req->r_osd);
1189
		}
1190
		if (list_empty(&req->r_linger_item))
1191
			req->r_osd = NULL;
1192
	}
S
Sage Weil 已提交
1193

A
Alex Elder 已提交
1194
	list_del_init(&req->r_req_lru_item);
S
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1195 1196
	ceph_osdc_put_request(req);

1197 1198 1199
	if (osdc->num_requests == 0) {
		dout(" no requests, canceling timeout\n");
		__cancel_osd_timeout(osdc);
S
Sage Weil 已提交
1200 1201 1202 1203 1204 1205 1206 1207
	}
}

/*
 * Cancel a previously queued request message
 */
static void __cancel_request(struct ceph_osd_request *req)
{
1208
	if (req->r_sent && req->r_osd) {
1209
		ceph_msg_revoke(req->r_request);
S
Sage Weil 已提交
1210 1211 1212 1213
		req->r_sent = 0;
	}
}

1214 1215 1216 1217
static void __register_linger_request(struct ceph_osd_client *osdc,
				    struct ceph_osd_request *req)
{
	dout("__register_linger_request %p\n", req);
1218
	ceph_osdc_get_request(req);
1219
	list_add_tail(&req->r_linger_item, &osdc->req_linger);
1220 1221 1222
	if (req->r_osd)
		list_add_tail(&req->r_linger_osd,
			      &req->r_osd->o_linger_requests);
1223 1224 1225 1226 1227 1228
}

static void __unregister_linger_request(struct ceph_osd_client *osdc,
					struct ceph_osd_request *req)
{
	dout("__unregister_linger_request %p\n", req);
A
Alex Elder 已提交
1229
	list_del_init(&req->r_linger_item);
1230 1231 1232 1233 1234 1235 1236 1237
	if (req->r_osd) {
		list_del_init(&req->r_linger_osd);

		if (list_empty(&req->r_osd->o_requests) &&
		    list_empty(&req->r_osd->o_linger_requests)) {
			dout("moving osd to %p lru\n", req->r_osd);
			__move_osd_to_lru(osdc, req->r_osd);
		}
1238 1239
		if (list_empty(&req->r_osd_item))
			req->r_osd = NULL;
1240
	}
1241
	ceph_osdc_put_request(req);
1242 1243 1244 1245 1246 1247 1248
}

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) {
1249
		req->r_linger = 0;
1250
		__unregister_linger_request(osdc, req);
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265
	}
	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;
	}
}
EXPORT_SYMBOL(ceph_osdc_set_request_linger);

1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281
/*
 * Returns whether a request should be blocked from being sent
 * based on the current osdmap and osd_client settings.
 *
 * Caller should hold map_sem for read.
 */
static bool __req_should_be_paused(struct ceph_osd_client *osdc,
				   struct ceph_osd_request *req)
{
	bool pauserd = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD);
	bool pausewr = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR) ||
		ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
	return (req->r_flags & CEPH_OSD_FLAG_READ && pauserd) ||
		(req->r_flags & CEPH_OSD_FLAG_WRITE && pausewr);
}

1282 1283 1284 1285 1286 1287 1288
/*
 * Calculate mapping of a request to a PG.  Takes tiering into account.
 */
static int __calc_request_pg(struct ceph_osdmap *osdmap,
			     struct ceph_osd_request *req,
			     struct ceph_pg *pg_out)
{
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
	bool need_check_tiering;

	need_check_tiering = false;
	if (req->r_target_oloc.pool == -1) {
		req->r_target_oloc = req->r_base_oloc; /* struct */
		need_check_tiering = true;
	}
	if (req->r_target_oid.name_len == 0) {
		ceph_oid_copy(&req->r_target_oid, &req->r_base_oid);
		need_check_tiering = true;
	}

	if (need_check_tiering &&
	    (req->r_flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1303 1304
		struct ceph_pg_pool_info *pi;

1305
		pi = ceph_pg_pool_by_id(osdmap, req->r_target_oloc.pool);
1306 1307 1308
		if (pi) {
			if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
			    pi->read_tier >= 0)
1309
				req->r_target_oloc.pool = pi->read_tier;
1310 1311
			if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
			    pi->write_tier >= 0)
1312
				req->r_target_oloc.pool = pi->write_tier;
1313 1314 1315 1316
		}
		/* !pi is caught in ceph_oloc_oid_to_pg() */
	}

1317 1318
	return ceph_oloc_oid_to_pg(osdmap, &req->r_target_oloc,
				   &req->r_target_oid, pg_out);
1319 1320
}

S
Sage Weil 已提交
1321 1322 1323
/*
 * 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
1324
 * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1325
 * (unsent, homeless) or leave on in-flight lru.
S
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1326 1327 1328 1329 1330
 *
 * Return 0 if unchanged, 1 if changed, or negative on error.
 *
 * Caller should hold map_sem for read and request_mutex.
 */
1331
static int __map_request(struct ceph_osd_client *osdc,
1332
			 struct ceph_osd_request *req, int force_resend)
S
Sage Weil 已提交
1333
{
1334
	struct ceph_pg pgid;
1335
	int acting[CEPH_PG_MAX_SIZE];
1336
	int num, o;
S
Sage Weil 已提交
1337
	int err;
1338
	bool was_paused;
S
Sage Weil 已提交
1339

1340
	dout("map_request %p tid %lld\n", req, req->r_tid);
1341 1342

	err = __calc_request_pg(osdc->osdmap, req, &pgid);
1343 1344
	if (err) {
		list_move(&req->r_req_lru_item, &osdc->req_notarget);
S
Sage Weil 已提交
1345
		return err;
1346
	}
1347 1348
	req->r_pgid = pgid;

1349 1350 1351
	num = ceph_calc_pg_acting(osdc->osdmap, pgid, acting, &o);
	if (num < 0)
		num = 0;
S
Sage Weil 已提交
1352

1353 1354 1355 1356 1357
	was_paused = req->r_paused;
	req->r_paused = __req_should_be_paused(osdc, req);
	if (was_paused && !req->r_paused)
		force_resend = 1;

1358 1359
	if ((!force_resend &&
	     req->r_osd && req->r_osd->o_osd == o &&
1360 1361 1362
	     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) ||
1363 1364
	    (req->r_osd == NULL && o == -1) ||
	    req->r_paused)
S
Sage Weil 已提交
1365 1366
		return 0;  /* no change */

1367 1368
	dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
	     req->r_tid, pgid.pool, pgid.seed, o,
S
Sage Weil 已提交
1369 1370
	     req->r_osd ? req->r_osd->o_osd : -1);

1371 1372 1373 1374
	/* record full pg acting set */
	memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
	req->r_num_pg_osds = num;

S
Sage Weil 已提交
1375 1376 1377 1378 1379 1380 1381 1382
	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) {
1383
		err = -ENOMEM;
1384
		req->r_osd = create_osd(osdc, o);
1385 1386
		if (!req->r_osd) {
			list_move(&req->r_req_lru_item, &osdc->req_notarget);
1387
			goto out;
1388
		}
S
Sage Weil 已提交
1389

1390
		dout("map_request osd %p is osd%d\n", req->r_osd, o);
S
Sage Weil 已提交
1391 1392
		__insert_osd(osdc, req->r_osd);

1393 1394 1395
		ceph_con_open(&req->r_osd->o_con,
			      CEPH_ENTITY_TYPE_OSD, o,
			      &osdc->osdmap->osd_addr[o]);
S
Sage Weil 已提交
1396 1397
	}

1398 1399
	if (req->r_osd) {
		__remove_osd_from_lru(req->r_osd);
1400 1401
		list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
		list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1402
	} else {
1403
		list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1404
	}
1405
	err = 1;   /* osd or pg changed */
S
Sage Weil 已提交
1406 1407 1408 1409 1410 1411 1412 1413

out:
	return err;
}

/*
 * caller should hold map_sem (for read) and request_mutex
 */
1414 1415
static void __send_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req)
S
Sage Weil 已提交
1416
{
1417
	void *p;
S
Sage Weil 已提交
1418

1419 1420 1421 1422 1423 1424 1425
	dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
	     req, req->r_tid, req->r_osd->o_osd, req->r_flags,
	     (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);

	/* fill in message content that changes each time we send it */
	put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
	put_unaligned_le32(req->r_flags, req->r_request_flags);
1426
	put_unaligned_le64(req->r_target_oloc.pool, req->r_request_pool);
1427 1428 1429 1430 1431 1432
	p = req->r_request_pgid;
	ceph_encode_64(&p, req->r_pgid.pool);
	ceph_encode_32(&p, req->r_pgid.seed);
	put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
	memcpy(req->r_request_reassert_version, &req->r_reassert_version,
	       sizeof(req->r_reassert_version));
1433

S
Sage Weil 已提交
1434
	req->r_stamp = jiffies;
1435
	list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
S
Sage Weil 已提交
1436 1437

	ceph_msg_get(req->r_request); /* send consumes a ref */
1438

S
Sage Weil 已提交
1439
	req->r_sent = req->r_osd->o_incarnation;
1440 1441

	ceph_con_send(&req->r_osd->o_con, req->r_request);
S
Sage Weil 已提交
1442 1443
}

1444 1445 1446
/*
 * Send any requests in the queue (req_unsent).
 */
A
Alex Elder 已提交
1447
static void __send_queued(struct ceph_osd_client *osdc)
1448 1449 1450
{
	struct ceph_osd_request *req, *tmp;

A
Alex Elder 已提交
1451 1452
	dout("__send_queued\n");
	list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1453 1454 1455
		__send_request(osdc, req);
}

1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489
/*
 * Caller should hold map_sem for read and request_mutex.
 */
static int __ceph_osdc_start_request(struct ceph_osd_client *osdc,
				     struct ceph_osd_request *req,
				     bool nofail)
{
	int rc;

	__register_request(osdc, req);
	req->r_sent = 0;
	req->r_got_reply = 0;
	rc = __map_request(osdc, req, 0);
	if (rc < 0) {
		if (nofail) {
			dout("osdc_start_request failed map, "
				" will retry %lld\n", req->r_tid);
			rc = 0;
		} else {
			__unregister_request(osdc, req);
		}
		return rc;
	}

	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 {
		__send_queued(osdc);
	}

	return 0;
}

S
Sage Weil 已提交
1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502
/*
 * Timeout callback, called every N seconds when 1 or more osd
 * requests has been active for more than N seconds.  When this
 * happens, we ping all OSDs with requests who have timed out to
 * ensure any communications channel reset is detected.  Reset the
 * request timeouts another N seconds in the future as we go.
 * Reschedule the timeout event another N seconds in future (unless
 * there are no open requests).
 */
static void handle_timeout(struct work_struct *work)
{
	struct ceph_osd_client *osdc =
		container_of(work, struct ceph_osd_client, timeout_work.work);
S
Sage Weil 已提交
1503
	struct ceph_osd_request *req;
S
Sage Weil 已提交
1504
	struct ceph_osd *osd;
1505
	unsigned long keepalive =
1506
		osdc->client->options->osd_keepalive_timeout * HZ;
1507
	struct list_head slow_osds;
S
Sage Weil 已提交
1508 1509 1510 1511 1512 1513 1514
	dout("timeout\n");
	down_read(&osdc->map_sem);

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

	mutex_lock(&osdc->request_mutex);

1515 1516 1517 1518 1519 1520 1521
	/*
	 * ping osds that are a bit slow.  this ensures that if there
	 * is a break in the TCP connection we will notice, and reopen
	 * a connection with that osd (from the fault callback).
	 */
	INIT_LIST_HEAD(&slow_osds);
	list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
S
Sage Weil 已提交
1522
		if (time_before(jiffies, req->r_stamp + keepalive))
1523 1524 1525 1526 1527
			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
1528
		     req->r_tid, osd->o_osd);
1529 1530 1531 1532 1533 1534
		list_move_tail(&osd->o_keepalive_item, &slow_osds);
	}
	while (!list_empty(&slow_osds)) {
		osd = list_entry(slow_osds.next, struct ceph_osd,
				 o_keepalive_item);
		list_del_init(&osd->o_keepalive_item);
S
Sage Weil 已提交
1535 1536 1537
		ceph_con_keepalive(&osd->o_con);
	}

1538
	__schedule_osd_timeout(osdc);
A
Alex Elder 已提交
1539
	__send_queued(osdc);
S
Sage Weil 已提交
1540 1541 1542 1543
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
}

1544 1545 1546 1547 1548 1549
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 =
1550
		osdc->client->options->osd_idle_ttl * HZ >> 2;
1551 1552 1553

	dout("osds timeout\n");
	down_read(&osdc->map_sem);
1554
	remove_old_osds(osdc);
1555 1556 1557 1558 1559 1560
	up_read(&osdc->map_sem);

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

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 1658 1659 1660 1661 1662 1663
static int ceph_oloc_decode(void **p, void *end,
			    struct ceph_object_locator *oloc)
{
	u8 struct_v, struct_cv;
	u32 len;
	void *struct_end;
	int ret = 0;

	ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
	struct_v = ceph_decode_8(p);
	struct_cv = ceph_decode_8(p);
	if (struct_v < 3) {
		pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
			struct_v, struct_cv);
		goto e_inval;
	}
	if (struct_cv > 6) {
		pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
			struct_v, struct_cv);
		goto e_inval;
	}
	len = ceph_decode_32(p);
	ceph_decode_need(p, end, len, e_inval);
	struct_end = *p + len;

	oloc->pool = ceph_decode_64(p);
	*p += 4; /* skip preferred */

	len = ceph_decode_32(p);
	if (len > 0) {
		pr_warn("ceph_object_locator::key is set\n");
		goto e_inval;
	}

	if (struct_v >= 5) {
		len = ceph_decode_32(p);
		if (len > 0) {
			pr_warn("ceph_object_locator::nspace is set\n");
			goto e_inval;
		}
	}

	if (struct_v >= 6) {
		s64 hash = ceph_decode_64(p);
		if (hash != -1) {
			pr_warn("ceph_object_locator::hash is set\n");
			goto e_inval;
		}
	}

	/* skip the rest */
	*p = struct_end;
out:
	return ret;

e_inval:
	ret = -EINVAL;
	goto out;
}

static int ceph_redirect_decode(void **p, void *end,
				struct ceph_request_redirect *redir)
{
	u8 struct_v, struct_cv;
	u32 len;
	void *struct_end;
	int ret;

	ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
	struct_v = ceph_decode_8(p);
	struct_cv = ceph_decode_8(p);
	if (struct_cv > 1) {
		pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
			struct_v, struct_cv);
		goto e_inval;
	}
	len = ceph_decode_32(p);
	ceph_decode_need(p, end, len, e_inval);
	struct_end = *p + len;

	ret = ceph_oloc_decode(p, end, &redir->oloc);
	if (ret)
		goto out;

	len = ceph_decode_32(p);
	if (len > 0) {
		pr_warn("ceph_request_redirect::object_name is set\n");
		goto e_inval;
	}

	len = ceph_decode_32(p);
	*p += len; /* skip osd_instructions */

	/* skip the rest */
	*p = struct_end;
out:
	return ret;

e_inval:
	ret = -EINVAL;
	goto out;
}

S
Sage Weil 已提交
1664 1665 1666 1667 1668
static void complete_request(struct ceph_osd_request *req)
{
	complete_all(&req->r_safe_completion);  /* fsync waiter */
}

S
Sage Weil 已提交
1669 1670 1671 1672
/*
 * handle osd op reply.  either call the callback if it is specified,
 * or do the completion to wake up the waiting thread.
 */
1673 1674
static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
			 struct ceph_connection *con)
S
Sage Weil 已提交
1675
{
1676
	void *p, *end;
S
Sage Weil 已提交
1677
	struct ceph_osd_request *req;
1678
	struct ceph_request_redirect redir;
S
Sage Weil 已提交
1679
	u64 tid;
1680
	int object_len;
1681 1682
	unsigned int numops;
	int payload_len, flags;
1683
	s32 result;
1684 1685 1686 1687 1688 1689
	s32 retry_attempt;
	struct ceph_pg pg;
	int err;
	u32 reassert_epoch;
	u64 reassert_version;
	u32 osdmap_epoch;
1690
	int already_completed;
1691
	u32 bytes;
1692
	unsigned int i;
S
Sage Weil 已提交
1693

1694
	tid = le64_to_cpu(msg->hdr.tid);
1695 1696 1697 1698 1699 1700 1701 1702 1703 1704
	dout("handle_reply %p tid %llu\n", msg, tid);

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

	ceph_decode_need(&p, end, 4, bad);
	object_len = ceph_decode_32(&p);
	ceph_decode_need(&p, end, object_len, bad);
	p += object_len;

1705
	err = ceph_decode_pgid(&p, end, &pg);
1706
	if (err)
S
Sage Weil 已提交
1707
		goto bad;
1708 1709 1710 1711 1712 1713 1714 1715

	ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
	flags = ceph_decode_64(&p);
	result = ceph_decode_32(&p);
	reassert_epoch = ceph_decode_32(&p);
	reassert_version = ceph_decode_64(&p);
	osdmap_epoch = ceph_decode_32(&p);

S
Sage Weil 已提交
1716
	/* lookup */
1717
	down_read(&osdc->map_sem);
S
Sage Weil 已提交
1718 1719 1720 1721
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (req == NULL) {
		dout("handle_reply tid %llu dne\n", tid);
1722
		goto bad_mutex;
S
Sage Weil 已提交
1723 1724
	}
	ceph_osdc_get_request(req);
1725 1726 1727 1728

	dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
	     req, result);

1729
	ceph_decode_need(&p, end, 4, bad_put);
1730 1731 1732 1733 1734 1735
	numops = ceph_decode_32(&p);
	if (numops > CEPH_OSD_MAX_OP)
		goto bad_put;
	if (numops != req->r_num_ops)
		goto bad_put;
	payload_len = 0;
1736
	ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746
	for (i = 0; i < numops; i++) {
		struct ceph_osd_op *op = p;
		int len;

		len = le32_to_cpu(op->payload_len);
		req->r_reply_op_len[i] = len;
		dout(" op %d has %d bytes\n", i, len);
		payload_len += len;
		p += sizeof(*op);
	}
1747 1748
	bytes = le32_to_cpu(msg->hdr.data_len);
	if (payload_len != bytes) {
1749
		pr_warning("sum of op payload lens %d != data_len %d",
1750
			   payload_len, bytes);
1751 1752 1753
		goto bad_put;
	}

1754
	ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
1755 1756 1757
	retry_attempt = ceph_decode_32(&p);
	for (i = 0; i < numops; i++)
		req->r_reply_op_result[i] = ceph_decode_32(&p);
S
Sage Weil 已提交
1758

1759 1760 1761
	if (le16_to_cpu(msg->hdr.version) >= 6) {
		p += 8 + 4; /* skip replay_version */
		p += 8; /* skip user_version */
Y
Yan, Zheng 已提交
1762

1763 1764 1765 1766 1767 1768
		err = ceph_redirect_decode(&p, end, &redir);
		if (err)
			goto bad_put;
	} else {
		redir.oloc.pool = -1;
	}
S
Sage Weil 已提交
1769

1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784
	if (redir.oloc.pool != -1) {
		dout("redirect pool %lld\n", redir.oloc.pool);

		__unregister_request(osdc, req);

		req->r_target_oloc = redir.oloc; /* struct */

		/*
		 * Start redirect requests with nofail=true.  If
		 * mapping fails, request will end up on the notarget
		 * list, waiting for the new osdmap (which can take
		 * a while), even though the original request mapped
		 * successfully.  In the future we might want to follow
		 * original request's nofail setting here.
		 */
1785
		err = __ceph_osdc_start_request(osdc, req, true);
1786 1787
		BUG_ON(err);

1788
		goto out_unlock;
1789 1790 1791 1792
	}

	already_completed = req->r_got_reply;
	if (!req->r_got_reply) {
1793
		req->r_result = result;
S
Sage Weil 已提交
1794 1795 1796 1797 1798 1799
		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, */
1800 1801
		req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
		req->r_reassert_version.version = cpu_to_le64(reassert_version);
S
Sage Weil 已提交
1802 1803 1804 1805

		req->r_got_reply = 1;
	} else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
		dout("handle_reply tid %llu dup ack\n", tid);
1806
		goto out_unlock;
S
Sage Weil 已提交
1807 1808 1809 1810
	}

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

1811 1812 1813
	if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
		__register_linger_request(osdc, req);

S
Sage Weil 已提交
1814
	/* either this is a read, or we got the safe response */
1815 1816
	if (result < 0 ||
	    (flags & CEPH_OSD_FLAG_ONDISK) ||
S
Sage Weil 已提交
1817 1818 1819 1820
	    ((flags & CEPH_OSD_FLAG_WRITE) == 0))
		__unregister_request(osdc, req);

	mutex_unlock(&osdc->request_mutex);
1821
	up_read(&osdc->map_sem);
S
Sage Weil 已提交
1822

Y
Yan, Zheng 已提交
1823
	if (!already_completed) {
1824 1825 1826
		if (req->r_unsafe_callback &&
		    result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
			req->r_unsafe_callback(req, true);
Y
Yan, Zheng 已提交
1827 1828 1829 1830 1831
		if (req->r_callback)
			req->r_callback(req, msg);
		else
			complete_all(&req->r_completion);
	}
S
Sage Weil 已提交
1832

1833 1834 1835
	if (flags & CEPH_OSD_FLAG_ONDISK) {
		if (req->r_unsafe_callback && already_completed)
			req->r_unsafe_callback(req, false);
S
Sage Weil 已提交
1836
		complete_request(req);
1837
	}
S
Sage Weil 已提交
1838

1839
out:
1840
	dout("req=%p req->r_linger=%d\n", req, req->r_linger);
S
Sage Weil 已提交
1841 1842
	ceph_osdc_put_request(req);
	return;
1843 1844 1845 1846
out_unlock:
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
	goto out;
S
Sage Weil 已提交
1847

1848
bad_put:
1849 1850 1851 1852 1853 1854 1855
	req->r_result = -EIO;
	__unregister_request(osdc, req);
	if (req->r_callback)
		req->r_callback(req, msg);
	else
		complete_all(&req->r_completion);
	complete_request(req);
1856
	ceph_osdc_put_request(req);
1857 1858
bad_mutex:
	mutex_unlock(&osdc->request_mutex);
1859
	up_read(&osdc->map_sem);
S
Sage Weil 已提交
1860
bad:
1861 1862
	pr_err("corrupt osd_op_reply got %d %d\n",
	       (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1863
	ceph_msg_dump(msg);
S
Sage Weil 已提交
1864 1865
}

1866
static void reset_changed_osds(struct ceph_osd_client *osdc)
S
Sage Weil 已提交
1867 1868 1869
{
	struct rb_node *p, *n;

1870 1871
	for (p = rb_first(&osdc->osds); p; p = n) {
		struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
S
Sage Weil 已提交
1872

1873 1874 1875 1876 1877 1878 1879
		n = rb_next(p);
		if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
		    memcmp(&osd->o_con.peer_addr,
			   ceph_osd_addr(osdc->osdmap,
					 osd->o_osd),
			   sizeof(struct ceph_entity_addr)) != 0)
			__reset_osd(osdc, osd);
S
Sage Weil 已提交
1880
	}
1881 1882 1883
}

/*
1884 1885
 * Requeue requests whose mapping to an OSD has changed.  If requests map to
 * no osd, request a new map.
1886
 *
1887
 * Caller should hold map_sem for read.
1888
 */
1889 1890
static void kick_requests(struct ceph_osd_client *osdc, bool force_resend,
			  bool force_resend_writes)
1891
{
1892
	struct ceph_osd_request *req, *nreq;
1893 1894 1895
	struct rb_node *p;
	int needmap = 0;
	int err;
1896
	bool force_resend_req;
1897

1898 1899
	dout("kick_requests %s %s\n", force_resend ? " (force resend)" : "",
		force_resend_writes ? " (force resend writes)" : "");
1900
	mutex_lock(&osdc->request_mutex);
1901
	for (p = rb_first(&osdc->requests); p; ) {
1902
		req = rb_entry(p, struct ceph_osd_request, r_node);
1903
		p = rb_next(p);
1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916

		/*
		 * For linger requests that have not yet been
		 * registered, move them to the linger list; they'll
		 * be sent to the osd in the loop below.  Unregister
		 * the request before re-registering it as a linger
		 * request to ensure the __map_request() below
		 * will decide it needs to be sent.
		 */
		if (req->r_linger && list_empty(&req->r_linger_item)) {
			dout("%p tid %llu restart on osd%d\n",
			     req, req->r_tid,
			     req->r_osd ? req->r_osd->o_osd : -1);
1917
			ceph_osdc_get_request(req);
1918 1919
			__unregister_request(osdc, req);
			__register_linger_request(osdc, req);
1920
			ceph_osdc_put_request(req);
1921 1922 1923
			continue;
		}

1924 1925 1926 1927
		force_resend_req = force_resend ||
			(force_resend_writes &&
				req->r_flags & CEPH_OSD_FLAG_WRITE);
		err = __map_request(osdc, req, force_resend_req);
1928 1929 1930 1931 1932 1933
		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) {
1934 1935 1936 1937
			if (!req->r_linger) {
				dout("%p tid %llu requeued on osd%d\n", req,
				     req->r_tid,
				     req->r_osd ? req->r_osd->o_osd : -1);
1938
				req->r_flags |= CEPH_OSD_FLAG_RETRY;
1939 1940
			}
		}
1941 1942 1943 1944 1945 1946
	}

	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);

1947 1948
		err = __map_request(osdc, req,
				    force_resend || force_resend_writes);
1949
		dout("__map_request returned %d\n", err);
1950 1951 1952 1953 1954 1955 1956 1957
		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;
1958
		}
1959 1960 1961 1962

		dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
		     req->r_osd ? req->r_osd->o_osd : -1);
		__register_request(osdc, req);
1963
		__unregister_linger_request(osdc, req);
1964
	}
1965
	reset_changed_osds(osdc);
S
Sage Weil 已提交
1966 1967 1968 1969 1970 1971
	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);
	}
1972
}
1973 1974


S
Sage Weil 已提交
1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989
/*
 * 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;
1990
	bool was_full;
S
Sage Weil 已提交
1991 1992 1993 1994 1995 1996 1997 1998

	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));
1999 2000
	if (ceph_check_fsid(osdc->client, &fsid) < 0)
		return;
S
Sage Weil 已提交
2001 2002 2003

	down_write(&osdc->map_sem);

2004 2005
	was_full = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);

S
Sage Weil 已提交
2006 2007 2008 2009 2010
	/* 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);
2011 2012
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
Sage Weil 已提交
2013 2014 2015 2016 2017 2018 2019
		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,
2020
							  &osdc->client->msgr);
S
Sage Weil 已提交
2021 2022 2023 2024
			if (IS_ERR(newmap)) {
				err = PTR_ERR(newmap);
				goto bad;
			}
2025
			BUG_ON(!newmap);
S
Sage Weil 已提交
2026 2027 2028 2029
			if (newmap != osdc->osdmap) {
				ceph_osdmap_destroy(osdc->osdmap);
				osdc->osdmap = newmap;
			}
2030 2031 2032 2033
			was_full = was_full ||
				ceph_osdmap_flag(osdc->osdmap,
						 CEPH_OSDMAP_FULL);
			kick_requests(osdc, 0, was_full);
S
Sage Weil 已提交
2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048
		} 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);
2049 2050
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
Sage Weil 已提交
2051 2052 2053 2054 2055 2056 2057 2058 2059
		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 {
2060 2061
			int skipped_map = 0;

S
Sage Weil 已提交
2062
			dout("taking full map %u len %d\n", epoch, maplen);
2063
			newmap = ceph_osdmap_decode(&p, p+maplen);
S
Sage Weil 已提交
2064 2065 2066 2067
			if (IS_ERR(newmap)) {
				err = PTR_ERR(newmap);
				goto bad;
			}
2068
			BUG_ON(!newmap);
S
Sage Weil 已提交
2069 2070
			oldmap = osdc->osdmap;
			osdc->osdmap = newmap;
2071 2072 2073
			if (oldmap) {
				if (oldmap->epoch + 1 < newmap->epoch)
					skipped_map = 1;
S
Sage Weil 已提交
2074
				ceph_osdmap_destroy(oldmap);
2075
			}
2076 2077 2078 2079
			was_full = was_full ||
				ceph_osdmap_flag(osdc->osdmap,
						 CEPH_OSDMAP_FULL);
			kick_requests(osdc, skipped_map, was_full);
S
Sage Weil 已提交
2080 2081 2082 2083 2084
		}
		p += maplen;
		nr_maps--;
	}

2085 2086
	if (!osdc->osdmap)
		goto bad;
S
Sage Weil 已提交
2087 2088 2089
done:
	downgrade_write(&osdc->map_sem);
	ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
2090 2091 2092 2093 2094 2095

	/*
	 * subscribe to subsequent osdmap updates if full to ensure
	 * we find out when we are no longer full and stop returning
	 * ENOSPC.
	 */
2096 2097 2098
	if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) ||
		ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD) ||
		ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR))
2099 2100
		ceph_monc_request_next_osdmap(&osdc->client->monc);

A
Alex Elder 已提交
2101 2102 2103
	mutex_lock(&osdc->request_mutex);
	__send_queued(osdc);
	mutex_unlock(&osdc->request_mutex);
S
Sage Weil 已提交
2104
	up_read(&osdc->map_sem);
2105
	wake_up_all(&osdc->client->auth_wq);
S
Sage Weil 已提交
2106 2107 2108 2109
	return;

bad:
	pr_err("osdc handle_map corrupt msg\n");
2110
	ceph_msg_dump(msg);
S
Sage Weil 已提交
2111 2112 2113
	up_write(&osdc->map_sem);
}

2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
/*
 * 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 *),
2196
			   void *data, struct ceph_osd_event **pevent)
2197 2198 2199 2200 2201 2202 2203 2204 2205
{
	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;
2206
	event->one_shot = 0;
2207 2208 2209
	event->data = data;
	event->osdc = osdc;
	INIT_LIST_HEAD(&event->osd_node);
2210
	RB_CLEAR_NODE(&event->node);
2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256
	kref_init(&event->kref);   /* one ref for us */
	kref_get(&event->kref);    /* one ref for the caller */

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

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

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

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


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

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


/*
 * Process osd watch notifications
 */
2257 2258
static void handle_watch_notify(struct ceph_osd_client *osdc,
				struct ceph_msg *msg)
2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278
{
	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) {
2279
		BUG_ON(event->one_shot);
2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290
		get_event(event);
	}
	spin_unlock(&osdc->event_lock);
	dout("handle_watch_notify cookie %lld ver %lld event %p\n",
	     cookie, ver, event);
	if (event) {
		event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
		if (!event_work) {
			dout("ERROR: could not allocate event_work\n");
			goto done_err;
		}
2291
		INIT_WORK(&event_work->work, do_event_work);
2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311
		event_work->event = event;
		event_work->ver = ver;
		event_work->notify_id = notify_id;
		event_work->opcode = opcode;
		if (!queue_work(osdc->notify_wq, &event_work->work)) {
			dout("WARNING: failed to queue notify event work\n");
			goto done_err;
		}
	}

	return;

done_err:
	ceph_osdc_put_event(event);
	return;

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

2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359
/*
 * build new request AND message
 *
 */
void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
				struct ceph_snap_context *snapc, u64 snap_id,
				struct timespec *mtime)
{
	struct ceph_msg *msg = req->r_request;
	void *p;
	size_t msg_size;
	int flags = req->r_flags;
	u64 data_len;
	unsigned int i;

	req->r_snapid = snap_id;
	req->r_snapc = ceph_get_snap_context(snapc);

	/* encode request */
	msg->hdr.version = cpu_to_le16(4);

	p = msg->front.iov_base;
	ceph_encode_32(&p, 1);   /* client_inc  is always 1 */
	req->r_request_osdmap_epoch = p;
	p += 4;
	req->r_request_flags = p;
	p += 4;
	if (req->r_flags & CEPH_OSD_FLAG_WRITE)
		ceph_encode_timespec(p, mtime);
	p += sizeof(struct ceph_timespec);
	req->r_request_reassert_version = p;
	p += sizeof(struct ceph_eversion); /* will get filled in */

	/* oloc */
	ceph_encode_8(&p, 4);
	ceph_encode_8(&p, 4);
	ceph_encode_32(&p, 8 + 4 + 4);
	req->r_request_pool = p;
	p += 8;
	ceph_encode_32(&p, -1);  /* preferred */
	ceph_encode_32(&p, 0);   /* key len */

	ceph_encode_8(&p, 1);
	req->r_request_pgid = p;
	p += 8 + 4;
	ceph_encode_32(&p, -1);  /* preferred */

	/* oid */
2360 2361 2362 2363 2364
	ceph_encode_32(&p, req->r_base_oid.name_len);
	memcpy(p, req->r_base_oid.name, req->r_base_oid.name_len);
	dout("oid '%.*s' len %d\n", req->r_base_oid.name_len,
	     req->r_base_oid.name, req->r_base_oid.name_len);
	p += req->r_base_oid.name_len;
2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410

	/* ops--can imply data */
	ceph_encode_16(&p, (u16)req->r_num_ops);
	data_len = 0;
	for (i = 0; i < req->r_num_ops; i++) {
		data_len += osd_req_encode_op(req, p, i);
		p += sizeof(struct ceph_osd_op);
	}

	/* snaps */
	ceph_encode_64(&p, req->r_snapid);
	ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
	ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
	if (req->r_snapc) {
		for (i = 0; i < snapc->num_snaps; i++) {
			ceph_encode_64(&p, req->r_snapc->snaps[i]);
		}
	}

	req->r_request_attempts = p;
	p += 4;

	/* data */
	if (flags & CEPH_OSD_FLAG_WRITE) {
		u16 data_off;

		/*
		 * The header "data_off" is a hint to the receiver
		 * allowing it to align received data into its
		 * buffers such that there's no need to re-copy
		 * it before writing it to disk (direct I/O).
		 */
		data_off = (u16) (off & 0xffff);
		req->r_request->hdr.data_off = cpu_to_le16(data_off);
	}
	req->r_request->hdr.data_len = cpu_to_le32(data_len);

	BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
	msg_size = p - msg->front.iov_base;
	msg->front.iov_len = msg_size;
	msg->hdr.front_len = cpu_to_le32(msg_size);

	dout("build_request msg_size was %d\n", (int)msg_size);
}
EXPORT_SYMBOL(ceph_osdc_build_request);

2411 2412 2413 2414 2415 2416 2417
/*
 * Register request, send initial attempt.
 */
int ceph_osdc_start_request(struct ceph_osd_client *osdc,
			    struct ceph_osd_request *req,
			    bool nofail)
{
2418
	int rc;
2419

S
Sage Weil 已提交
2420 2421
	down_read(&osdc->map_sem);
	mutex_lock(&osdc->request_mutex);
2422 2423 2424

	rc = __ceph_osdc_start_request(osdc, req, nofail);

S
Sage Weil 已提交
2425 2426
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
2427

S
Sage Weil 已提交
2428 2429
	return rc;
}
2430
EXPORT_SYMBOL(ceph_osdc_start_request);
S
Sage Weil 已提交
2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443

/*
 * 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);
2444
		__unregister_request(osdc, req);
S
Sage Weil 已提交
2445
		mutex_unlock(&osdc->request_mutex);
S
Sage Weil 已提交
2446
		complete_request(req);
2447
		dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
S
Sage Weil 已提交
2448 2449 2450 2451 2452 2453
		return rc;
	}

	dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
	return req->r_result;
}
2454
EXPORT_SYMBOL(ceph_osdc_wait_request);
S
Sage Weil 已提交
2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487

/*
 * 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);
}
2488
EXPORT_SYMBOL(ceph_osdc_sync);
S
Sage Weil 已提交
2489

2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500
/*
 * Call all pending notify callbacks - for use after a watch is
 * unregistered, to make sure no more callbacks for it will be invoked
 */
extern void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
{
	flush_workqueue(osdc->notify_wq);
}
EXPORT_SYMBOL(ceph_osdc_flush_notifies);


S
Sage Weil 已提交
2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516
/*
 * 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;
2517
	INIT_LIST_HEAD(&osdc->osd_lru);
S
Sage Weil 已提交
2518
	osdc->requests = RB_ROOT;
2519
	INIT_LIST_HEAD(&osdc->req_lru);
2520 2521
	INIT_LIST_HEAD(&osdc->req_unsent);
	INIT_LIST_HEAD(&osdc->req_notarget);
2522
	INIT_LIST_HEAD(&osdc->req_linger);
S
Sage Weil 已提交
2523 2524
	osdc->num_requests = 0;
	INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2525
	INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2526 2527 2528
	spin_lock_init(&osdc->event_lock);
	osdc->event_tree = RB_ROOT;
	osdc->event_count = 0;
2529 2530

	schedule_delayed_work(&osdc->osds_timeout_work,
2531
	   round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
S
Sage Weil 已提交
2532

2533
	err = -ENOMEM;
S
Sage Weil 已提交
2534 2535 2536
	osdc->req_mempool = mempool_create_kmalloc_pool(10,
					sizeof(struct ceph_osd_request));
	if (!osdc->req_mempool)
2537
		goto out;
S
Sage Weil 已提交
2538

2539 2540
	err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
				OSD_OP_FRONT_LEN, 10, true,
2541
				"osd_op");
S
Sage Weil 已提交
2542
	if (err < 0)
2543
		goto out_mempool;
2544
	err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2545 2546
				OSD_OPREPLY_FRONT_LEN, 10, true,
				"osd_op_reply");
S
Sage Weil 已提交
2547 2548
	if (err < 0)
		goto out_msgpool;
2549

2550
	err = -ENOMEM;
2551
	osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2552
	if (!osdc->notify_wq)
2553 2554
		goto out_msgpool_reply;

S
Sage Weil 已提交
2555
	return 0;
2556

2557 2558
out_msgpool_reply:
	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
S
Sage Weil 已提交
2559 2560
out_msgpool:
	ceph_msgpool_destroy(&osdc->msgpool_op);
2561 2562 2563 2564
out_mempool:
	mempool_destroy(osdc->req_mempool);
out:
	return err;
S
Sage Weil 已提交
2565 2566 2567 2568
}

void ceph_osdc_stop(struct ceph_osd_client *osdc)
{
2569 2570
	flush_workqueue(osdc->notify_wq);
	destroy_workqueue(osdc->notify_wq);
S
Sage Weil 已提交
2571
	cancel_delayed_work_sync(&osdc->timeout_work);
2572
	cancel_delayed_work_sync(&osdc->osds_timeout_work);
S
Sage Weil 已提交
2573 2574 2575 2576
	if (osdc->osdmap) {
		ceph_osdmap_destroy(osdc->osdmap);
		osdc->osdmap = NULL;
	}
2577
	remove_all_osds(osdc);
S
Sage Weil 已提交
2578 2579
	mempool_destroy(osdc->req_mempool);
	ceph_msgpool_destroy(&osdc->msgpool_op);
S
Sage Weil 已提交
2580
	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
S
Sage Weil 已提交
2581 2582 2583 2584 2585 2586 2587 2588 2589 2590
}

/*
 * 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,
2591
			struct page **pages, int num_pages, int page_align)
S
Sage Weil 已提交
2592 2593 2594 2595 2596 2597
{
	struct ceph_osd_request *req;
	int rc = 0;

	dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
	     vino.snap, off, *plen);
2598
	req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 1,
S
Sage Weil 已提交
2599
				    CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2600
				    NULL, truncate_seq, truncate_size,
2601
				    false);
2602 2603
	if (IS_ERR(req))
		return PTR_ERR(req);
S
Sage Weil 已提交
2604 2605

	/* it may be a short read due to an object boundary */
2606

2607
	osd_req_op_extent_osd_data_pages(req, 0,
2608
				pages, *plen, page_align, false, false);
S
Sage Weil 已提交
2609

2610
	dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
2611
	     off, *plen, *plen, page_align);
S
Sage Weil 已提交
2612

2613
	ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2614

S
Sage Weil 已提交
2615 2616 2617 2618 2619 2620 2621 2622
	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;
}
2623
EXPORT_SYMBOL(ceph_osdc_readpages);
S
Sage Weil 已提交
2624 2625 2626 2627 2628 2629 2630 2631 2632 2633

/*
 * 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,
2634
			 struct page **pages, int num_pages)
S
Sage Weil 已提交
2635 2636 2637
{
	struct ceph_osd_request *req;
	int rc = 0;
2638
	int page_align = off & ~PAGE_MASK;
S
Sage Weil 已提交
2639

2640
	BUG_ON(vino.snap != CEPH_NOSNAP);	/* snapshots aren't writeable */
2641
	req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 1,
S
Sage Weil 已提交
2642
				    CEPH_OSD_OP_WRITE,
2643
				    CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2644
				    snapc, truncate_seq, truncate_size,
2645
				    true);
2646 2647
	if (IS_ERR(req))
		return PTR_ERR(req);
S
Sage Weil 已提交
2648 2649

	/* it may be a short write due to an object boundary */
2650
	osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2651 2652
				false, false);
	dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
S
Sage Weil 已提交
2653

2654
	ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2655

2656
	rc = ceph_osdc_start_request(osdc, req, true);
S
Sage Weil 已提交
2657 2658 2659 2660 2661 2662 2663 2664 2665
	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;
}
2666
EXPORT_SYMBOL(ceph_osdc_writepages);
S
Sage Weil 已提交
2667

2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687
int ceph_osdc_setup(void)
{
	BUG_ON(ceph_osd_request_cache);
	ceph_osd_request_cache = kmem_cache_create("ceph_osd_request",
					sizeof (struct ceph_osd_request),
					__alignof__(struct ceph_osd_request),
					0, NULL);

	return ceph_osd_request_cache ? 0 : -ENOMEM;
}
EXPORT_SYMBOL(ceph_osdc_setup);

void ceph_osdc_cleanup(void)
{
	BUG_ON(!ceph_osd_request_cache);
	kmem_cache_destroy(ceph_osd_request_cache);
	ceph_osd_request_cache = NULL;
}
EXPORT_SYMBOL(ceph_osdc_cleanup);

S
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2688 2689 2690 2691 2692 2693
/*
 * handle incoming message
 */
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
{
	struct ceph_osd *osd = con->private;
2694
	struct ceph_osd_client *osdc;
S
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2695 2696 2697
	int type = le16_to_cpu(msg->hdr.type);

	if (!osd)
S
Sage Weil 已提交
2698
		goto out;
2699
	osdc = osd->o_osdc;
S
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2700 2701 2702 2703 2704 2705

	switch (type) {
	case CEPH_MSG_OSD_MAP:
		ceph_osdc_handle_map(osdc, msg);
		break;
	case CEPH_MSG_OSD_OPREPLY:
2706
		handle_reply(osdc, msg, con);
S
Sage Weil 已提交
2707
		break;
2708 2709 2710
	case CEPH_MSG_WATCH_NOTIFY:
		handle_watch_notify(osdc, msg);
		break;
S
Sage Weil 已提交
2711 2712 2713 2714 2715

	default:
		pr_err("received unknown message type %d %s\n", type,
		       ceph_msg_type_name(type));
	}
S
Sage Weil 已提交
2716
out:
S
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2717 2718 2719
	ceph_msg_put(msg);
}

2720
/*
2721 2722
 * lookup and return message for incoming reply.  set up reply message
 * pages.
2723 2724
 */
static struct ceph_msg *get_reply(struct ceph_connection *con,
2725 2726
				  struct ceph_msg_header *hdr,
				  int *skip)
S
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2727 2728 2729
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc = osd->o_osdc;
2730
	struct ceph_msg *m;
2731
	struct ceph_osd_request *req;
2732
	int front_len = le32_to_cpu(hdr->front_len);
2733
	int data_len = le32_to_cpu(hdr->data_len);
2734
	u64 tid;
S
Sage Weil 已提交
2735

2736 2737 2738 2739 2740 2741
	tid = le64_to_cpu(hdr->tid);
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (!req) {
		*skip = 1;
		m = NULL;
2742 2743
		dout("get_reply unknown tid %llu from osd%d\n", tid,
		     osd->o_osd);
2744 2745
		goto out;
	}
S
Sage Weil 已提交
2746

2747
	if (req->r_reply->con)
2748
		dout("%s revoking msg %p from old con %p\n", __func__,
2749 2750
		     req->r_reply, req->r_reply->con);
	ceph_msg_revoke_incoming(req->r_reply);
2751

2752
	if (front_len > req->r_reply->front_alloc_len) {
2753
		pr_warning("get_reply front %d > preallocated %d (%u#%llu)\n",
2754
			   front_len, req->r_reply->front_alloc_len,
2755 2756
			   (unsigned int)con->peer_name.type,
			   le64_to_cpu(con->peer_name.num));
2757 2758
		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
				 false);
2759
		if (!m)
S
Sage Weil 已提交
2760 2761 2762 2763 2764 2765
			goto out;
		ceph_msg_put(req->r_reply);
		req->r_reply = m;
	}
	m = ceph_msg_get(req->r_reply);

2766
	if (data_len > 0) {
2767
		struct ceph_osd_data *osd_data;
2768

2769 2770 2771 2772 2773
		/*
		 * XXX This is assuming there is only one op containing
		 * XXX page data.  Probably OK for reads, but this
		 * XXX ought to be done more generally.
		 */
2774
		osd_data = osd_req_op_extent_osd_data(req, 0);
2775 2776
		if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
			if (osd_data->pages &&
2777
				unlikely(osd_data->length < data_len)) {
2778

2779 2780 2781
				pr_warning("tid %lld reply has %d bytes "
					"we had only %llu bytes ready\n",
					tid, data_len, osd_data->length);
2782 2783 2784 2785 2786 2787
				*skip = 1;
				ceph_msg_put(m);
				m = NULL;
				goto out;
			}
		}
2788
	}
2789
	*skip = 0;
S
Sage Weil 已提交
2790
	dout("get_reply tid %lld %p\n", tid, m);
2791 2792 2793

out:
	mutex_unlock(&osdc->request_mutex);
2794
	return m;
2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805

}

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
2806
	*skip = 0;
2807 2808
	switch (type) {
	case CEPH_MSG_OSD_MAP:
2809
	case CEPH_MSG_WATCH_NOTIFY:
2810
		return ceph_msg_new(type, front, GFP_NOFS, false);
2811 2812 2813 2814 2815 2816 2817 2818
	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
2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837
}

/*
 * 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);
}

2838 2839 2840
/*
 * authentication
 */
2841 2842 2843 2844 2845
/*
 * 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,
2846
					int *proto, int force_new)
2847 2848 2849 2850
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;
2851
	struct ceph_auth_handshake *auth = &o->o_auth;
2852

2853
	if (force_new && auth->authorizer) {
2854
		ceph_auth_destroy_authorizer(ac, auth->authorizer);
2855 2856
		auth->authorizer = NULL;
	}
2857 2858 2859
	if (!auth->authorizer) {
		int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
						      auth);
2860
		if (ret)
2861
			return ERR_PTR(ret);
2862 2863
	} else {
		int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2864 2865 2866
						     auth);
		if (ret)
			return ERR_PTR(ret);
2867 2868
	}
	*proto = ac->protocol;
2869

2870
	return auth;
2871 2872 2873 2874 2875 2876 2877 2878 2879
}


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;

2880
	return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2881 2882
}

2883 2884 2885 2886 2887 2888
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;

2889
	ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2890 2891
	return ceph_monc_validate_auth(&osdc->client->monc);
}
2892

2893
static const struct ceph_connection_operations osd_con_ops = {
S
Sage Weil 已提交
2894 2895 2896
	.get = get_osd_con,
	.put = put_osd_con,
	.dispatch = dispatch,
2897 2898
	.get_authorizer = get_authorizer,
	.verify_authorizer_reply = verify_authorizer_reply,
2899
	.invalidate_authorizer = invalidate_authorizer,
S
Sage Weil 已提交
2900
	.alloc_msg = alloc_msg,
2901
	.fault = osd_reset,
S
Sage Weil 已提交
2902
};