osd_client.c 122.3 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/ceph_features.h>
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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_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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/*
 * 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.
 */

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static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req);
static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req);
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static void link_linger(struct ceph_osd *osd,
			struct ceph_osd_linger_request *lreq);
static void unlink_linger(struct ceph_osd *osd,
			  struct ceph_osd_linger_request *lreq);
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#if 1
static inline bool rwsem_is_wrlocked(struct rw_semaphore *sem)
{
	bool wrlocked = true;

	if (unlikely(down_read_trylock(sem))) {
		wrlocked = false;
		up_read(sem);
	}

	return wrlocked;
}
static inline void verify_osdc_locked(struct ceph_osd_client *osdc)
{
	WARN_ON(!rwsem_is_locked(&osdc->lock));
}
static inline void verify_osdc_wrlocked(struct ceph_osd_client *osdc)
{
	WARN_ON(!rwsem_is_wrlocked(&osdc->lock));
}
static inline void verify_osd_locked(struct ceph_osd *osd)
{
	struct ceph_osd_client *osdc = osd->o_osdc;

	WARN_ON(!(mutex_is_locked(&osd->lock) &&
		  rwsem_is_locked(&osdc->lock)) &&
		!rwsem_is_wrlocked(&osdc->lock));
}
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static inline void verify_lreq_locked(struct ceph_osd_linger_request *lreq)
{
	WARN_ON(!mutex_is_locked(&lreq->lock));
}
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#else
static inline void verify_osdc_locked(struct ceph_osd_client *osdc) { }
static inline void verify_osdc_wrlocked(struct ceph_osd_client *osdc) { }
static inline void verify_osd_locked(struct ceph_osd *osd) { }
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static inline void verify_lreq_locked(struct ceph_osd_linger_request *lreq) { }
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#endif

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/*
 * 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)				\
({									\
	struct ceph_osd_request *__oreq = (oreq);			\
	unsigned int __whch = (whch);					\
	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);

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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);
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	osd_req->r_ops[which].cls.indata_len += pagelist->length;
	osd_req->r_ops[which].indata_len += pagelist->length;
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}
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);
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	osd_req->r_ops[which].cls.indata_len += length;
	osd_req->r_ops[which].indata_len += length;
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}
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:
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	case CEPH_OSD_OP_WRITEFULL:
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		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;
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	case CEPH_OSD_OP_SETXATTR:
	case CEPH_OSD_OP_CMPXATTR:
		ceph_osd_data_release(&op->xattr.osd_data);
		break;
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	case CEPH_OSD_OP_STAT:
		ceph_osd_data_release(&op->raw_data_in);
		break;
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	case CEPH_OSD_OP_NOTIFY_ACK:
		ceph_osd_data_release(&op->notify_ack.request_data);
		break;
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	case CEPH_OSD_OP_NOTIFY:
		ceph_osd_data_release(&op->notify.request_data);
		ceph_osd_data_release(&op->notify.response_data);
		break;
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	case CEPH_OSD_OP_LIST_WATCHERS:
		ceph_osd_data_release(&op->list_watchers.response_data);
		break;
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	default:
		break;
	}
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}

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/*
 * Assumes @t is zero-initialized.
 */
static void target_init(struct ceph_osd_request_target *t)
{
	ceph_oid_init(&t->base_oid);
	ceph_oloc_init(&t->base_oloc);
	ceph_oid_init(&t->target_oid);
	ceph_oloc_init(&t->target_oloc);

	ceph_osds_init(&t->acting);
	ceph_osds_init(&t->up);
	t->size = -1;
	t->min_size = -1;

	t->osd = CEPH_HOMELESS_OSD;
}

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static void target_copy(struct ceph_osd_request_target *dest,
			const struct ceph_osd_request_target *src)
{
	ceph_oid_copy(&dest->base_oid, &src->base_oid);
	ceph_oloc_copy(&dest->base_oloc, &src->base_oloc);
	ceph_oid_copy(&dest->target_oid, &src->target_oid);
	ceph_oloc_copy(&dest->target_oloc, &src->target_oloc);

	dest->pgid = src->pgid; /* struct */
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	dest->spgid = src->spgid; /* struct */
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	dest->pg_num = src->pg_num;
	dest->pg_num_mask = src->pg_num_mask;
	ceph_osds_copy(&dest->acting, &src->acting);
	ceph_osds_copy(&dest->up, &src->up);
	dest->size = src->size;
	dest->min_size = src->min_size;
	dest->sort_bitwise = src->sort_bitwise;

	dest->flags = src->flags;
	dest->paused = src->paused;

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	dest->last_force_resend = src->last_force_resend;

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	dest->osd = src->osd;
}

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static void target_destroy(struct ceph_osd_request_target *t)
{
	ceph_oid_destroy(&t->base_oid);
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	ceph_oloc_destroy(&t->base_oloc);
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	ceph_oid_destroy(&t->target_oid);
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	ceph_oloc_destroy(&t->target_oloc);
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}

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/*
 * requests
 */
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static void request_release_checks(struct ceph_osd_request *req)
{
	WARN_ON(!RB_EMPTY_NODE(&req->r_node));
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	WARN_ON(!RB_EMPTY_NODE(&req->r_mc_node));
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	WARN_ON(!list_empty(&req->r_unsafe_item));
	WARN_ON(req->r_osd);
}

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static void ceph_osdc_release_request(struct kref *kref)
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{
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	struct ceph_osd_request *req = container_of(kref,
					    struct ceph_osd_request, r_kref);
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	unsigned int which;
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	dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
	     req->r_request, req->r_reply);
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	request_release_checks(req);
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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_put(req->r_reply);
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	for (which = 0; which < req->r_num_ops; which++)
		osd_req_op_data_release(req, which);
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	target_destroy(&req->r_t);
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	ceph_put_snap_context(req->r_snapc);
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	if (req->r_mempool)
		mempool_free(req, req->r_osdc->req_mempool);
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	else if (req->r_num_ops <= CEPH_OSD_SLAB_OPS)
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		kmem_cache_free(ceph_osd_request_cache, req);
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	else
		kfree(req);
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}
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void ceph_osdc_get_request(struct ceph_osd_request *req)
{
	dout("%s %p (was %d)\n", __func__, req,
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	     kref_read(&req->r_kref));
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	kref_get(&req->r_kref);
}
EXPORT_SYMBOL(ceph_osdc_get_request);

void ceph_osdc_put_request(struct ceph_osd_request *req)
{
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	if (req) {
		dout("%s %p (was %d)\n", __func__, req,
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		     kref_read(&req->r_kref));
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		kref_put(&req->r_kref, ceph_osdc_release_request);
	}
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}
EXPORT_SYMBOL(ceph_osdc_put_request);
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static void request_init(struct ceph_osd_request *req)
{
	/* req only, each op is zeroed in _osd_req_op_init() */
	memset(req, 0, sizeof(*req));

	kref_init(&req->r_kref);
	init_completion(&req->r_completion);
	RB_CLEAR_NODE(&req->r_node);
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	RB_CLEAR_NODE(&req->r_mc_node);
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	INIT_LIST_HEAD(&req->r_unsafe_item);

	target_init(&req->r_t);
}

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/*
 * This is ugly, but it allows us to reuse linger registration and ping
 * requests, keeping the structure of the code around send_linger{_ping}()
 * reasonable.  Setting up a min_nr=2 mempool for each linger request
 * and dealing with copying ops (this blasts req only, watch op remains
 * intact) isn't any better.
 */
static void request_reinit(struct ceph_osd_request *req)
{
	struct ceph_osd_client *osdc = req->r_osdc;
	bool mempool = req->r_mempool;
	unsigned int num_ops = req->r_num_ops;
	u64 snapid = req->r_snapid;
	struct ceph_snap_context *snapc = req->r_snapc;
	bool linger = req->r_linger;
	struct ceph_msg *request_msg = req->r_request;
	struct ceph_msg *reply_msg = req->r_reply;

	dout("%s req %p\n", __func__, req);
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	WARN_ON(kref_read(&req->r_kref) != 1);
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	request_release_checks(req);

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	WARN_ON(kref_read(&request_msg->kref) != 1);
	WARN_ON(kref_read(&reply_msg->kref) != 1);
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	target_destroy(&req->r_t);

	request_init(req);
	req->r_osdc = osdc;
	req->r_mempool = mempool;
	req->r_num_ops = num_ops;
	req->r_snapid = snapid;
	req->r_snapc = snapc;
	req->r_linger = linger;
	req->r_request = request_msg;
	req->r_reply = reply_msg;
}

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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;
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	if (use_mempool) {
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		BUG_ON(num_ops > CEPH_OSD_SLAB_OPS);
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		req = mempool_alloc(osdc->req_mempool, gfp_flags);
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	} else if (num_ops <= CEPH_OSD_SLAB_OPS) {
		req = kmem_cache_alloc(ceph_osd_request_cache, gfp_flags);
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	} else {
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		BUG_ON(num_ops > CEPH_OSD_MAX_OPS);
		req = kmalloc(sizeof(*req) + num_ops * sizeof(req->r_ops[0]),
			      gfp_flags);
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	}
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	if (unlikely(!req))
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		return NULL;
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	request_init(req);
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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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	req->r_snapid = CEPH_NOSNAP;
	req->r_snapc = ceph_get_snap_context(snapc);
538

539 540 541 542
	dout("%s req %p\n", __func__, req);
	return req;
}
EXPORT_SYMBOL(ceph_osdc_alloc_request);
543

544
static int ceph_oloc_encoding_size(const struct ceph_object_locator *oloc)
545 546 547 548
{
	return 8 + 4 + 4 + 4 + (oloc->pool_ns ? oloc->pool_ns->len : 0);
}

549 550 551 552 553
int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
{
	struct ceph_osd_client *osdc = req->r_osdc;
	struct ceph_msg *msg;
	int msg_size;
S
Sage Weil 已提交
554

555
	WARN_ON(ceph_oid_empty(&req->r_base_oid));
556
	WARN_ON(ceph_oloc_empty(&req->r_base_oloc));
557

558
	/* create request message */
559 560 561 562 563 564 565
	msg_size = CEPH_ENCODING_START_BLK_LEN +
			CEPH_PGID_ENCODING_LEN + 1; /* spgid */
	msg_size += 4 + 4 + 4; /* hash, osdmap_epoch, flags */
	msg_size += CEPH_ENCODING_START_BLK_LEN +
			sizeof(struct ceph_osd_reqid); /* reqid */
	msg_size += sizeof(struct ceph_blkin_trace_info); /* trace */
	msg_size += 4 + sizeof(struct ceph_timespec); /* client_inc, mtime */
566 567
	msg_size += CEPH_ENCODING_START_BLK_LEN +
			ceph_oloc_encoding_size(&req->r_base_oloc); /* oloc */
568 569
	msg_size += 4 + req->r_base_oid.name_len; /* oid */
	msg_size += 2 + req->r_num_ops * sizeof(struct ceph_osd_op);
570 571
	msg_size += 8; /* snapid */
	msg_size += 8; /* snap_seq */
572
	msg_size += 4 + 8 * (req->r_snapc ? req->r_snapc->num_snaps : 0);
573
	msg_size += 4 + 8; /* retry_attempt, features */
574

575
	if (req->r_mempool)
576
		msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
S
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577
	else
578 579 580
		msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp, true);
	if (!msg)
		return -ENOMEM;
581

S
Sage Weil 已提交
582
	memset(msg->front.iov_base, 0, msg->front.iov_len);
583 584
	req->r_request = msg;

585 586
	/* create reply message */
	msg_size = OSD_OPREPLY_FRONT_LEN;
587 588
	msg_size += req->r_base_oid.name_len;
	msg_size += req->r_num_ops * sizeof(struct ceph_osd_op);
589 590 591 592 593 594 595 596 597 598 599

	if (req->r_mempool)
		msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
	else
		msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, msg_size, gfp, true);
	if (!msg)
		return -ENOMEM;

	req->r_reply = msg;

	return 0;
600
}
601
EXPORT_SYMBOL(ceph_osdc_alloc_messages);
602

603
static bool osd_req_opcode_valid(u16 opcode)
604
{
605
	switch (opcode) {
606 607 608
#define GENERATE_CASE(op, opcode, str)	case CEPH_OSD_OP_##op: return true;
__CEPH_FORALL_OSD_OPS(GENERATE_CASE)
#undef GENERATE_CASE
609 610 611 612 613
	default:
		return false;
	}
}

614 615 616 617 618
/*
 * 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.
 */
619
static struct ceph_osd_req_op *
A
Alex Elder 已提交
620
_osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
621
		 u16 opcode, u32 flags)
622
{
623 624 625
	struct ceph_osd_req_op *op;

	BUG_ON(which >= osd_req->r_num_ops);
626 627
	BUG_ON(!osd_req_opcode_valid(opcode));

628
	op = &osd_req->r_ops[which];
629 630
	memset(op, 0, sizeof (*op));
	op->op = opcode;
631
	op->flags = flags;
632 633

	return op;
634 635
}

A
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636
void osd_req_op_init(struct ceph_osd_request *osd_req,
637
		     unsigned int which, u16 opcode, u32 flags)
A
Alex Elder 已提交
638
{
639
	(void)_osd_req_op_init(osd_req, which, opcode, flags);
A
Alex Elder 已提交
640 641 642
}
EXPORT_SYMBOL(osd_req_op_init);

643 644
void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
				unsigned int which, u16 opcode,
645 646 647
				u64 offset, u64 length,
				u64 truncate_size, u32 truncate_seq)
{
648 649
	struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
						      opcode, 0);
650 651
	size_t payload_len = 0;

L
Li Wang 已提交
652
	BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
653 654
	       opcode != CEPH_OSD_OP_WRITEFULL && opcode != CEPH_OSD_OP_ZERO &&
	       opcode != CEPH_OSD_OP_TRUNCATE);
655 656 657 658 659

	op->extent.offset = offset;
	op->extent.length = length;
	op->extent.truncate_size = truncate_size;
	op->extent.truncate_seq = truncate_seq;
660
	if (opcode == CEPH_OSD_OP_WRITE || opcode == CEPH_OSD_OP_WRITEFULL)
661 662
		payload_len += length;

663
	op->indata_len = payload_len;
664 665 666
}
EXPORT_SYMBOL(osd_req_op_extent_init);

667 668
void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
				unsigned int which, u64 length)
669
{
670 671 672 673 674 675
	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;
676 677 678 679 680 681

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

	op->extent.length = length;
682 683
	if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
		op->indata_len -= previous - length;
684 685 686
}
EXPORT_SYMBOL(osd_req_op_extent_update);

687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708
void osd_req_op_extent_dup_last(struct ceph_osd_request *osd_req,
				unsigned int which, u64 offset_inc)
{
	struct ceph_osd_req_op *op, *prev_op;

	BUG_ON(which + 1 >= osd_req->r_num_ops);

	prev_op = &osd_req->r_ops[which];
	op = _osd_req_op_init(osd_req, which + 1, prev_op->op, prev_op->flags);
	/* dup previous one */
	op->indata_len = prev_op->indata_len;
	op->outdata_len = prev_op->outdata_len;
	op->extent = prev_op->extent;
	/* adjust offset */
	op->extent.offset += offset_inc;
	op->extent.length -= offset_inc;

	if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
		op->indata_len -= offset_inc;
}
EXPORT_SYMBOL(osd_req_op_extent_dup_last);

709
void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
710
			u16 opcode, const char *class, const char *method)
711
{
712 713
	struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
						      opcode, 0);
714
	struct ceph_pagelist *pagelist;
715 716 717 718 719
	size_t payload_len = 0;
	size_t size;

	BUG_ON(opcode != CEPH_OSD_OP_CALL);

720 721 722 723
	pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
	BUG_ON(!pagelist);
	ceph_pagelist_init(pagelist);

724 725 726 727
	op->cls.class_name = class;
	size = strlen(class);
	BUG_ON(size > (size_t) U8_MAX);
	op->cls.class_len = size;
728
	ceph_pagelist_append(pagelist, class, size);
729 730 731 732 733 734
	payload_len += size;

	op->cls.method_name = method;
	size = strlen(method);
	BUG_ON(size > (size_t) U8_MAX);
	op->cls.method_len = size;
735
	ceph_pagelist_append(pagelist, method, size);
736 737
	payload_len += size;

738
	osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
739

740
	op->indata_len = payload_len;
741 742
}
EXPORT_SYMBOL(osd_req_op_cls_init);
743

744 745 746 747
int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
			  u16 opcode, const char *name, const void *value,
			  size_t size, u8 cmp_op, u8 cmp_mode)
{
748 749
	struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
						      opcode, 0);
750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
	struct ceph_pagelist *pagelist;
	size_t payload_len;

	BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);

	pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
	if (!pagelist)
		return -ENOMEM;

	ceph_pagelist_init(pagelist);

	payload_len = strlen(name);
	op->xattr.name_len = payload_len;
	ceph_pagelist_append(pagelist, name, payload_len);

	op->xattr.value_len = size;
	ceph_pagelist_append(pagelist, value, size);
	payload_len += size;

	op->xattr.cmp_op = cmp_op;
	op->xattr.cmp_mode = cmp_mode;

	ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
773
	op->indata_len = payload_len;
774 775 776 777
	return 0;
}
EXPORT_SYMBOL(osd_req_op_xattr_init);

778 779 780 781 782
/*
 * @watch_opcode: CEPH_OSD_WATCH_OP_*
 */
static void osd_req_op_watch_init(struct ceph_osd_request *req, int which,
				  u64 cookie, u8 watch_opcode)
783
{
784
	struct ceph_osd_req_op *op;
785

786
	op = _osd_req_op_init(req, which, CEPH_OSD_OP_WATCH, 0);
787
	op->watch.cookie = cookie;
788 789
	op->watch.op = watch_opcode;
	op->watch.gen = 0;
790 791
}

792 793 794 795 796 797
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,
798 799
						      CEPH_OSD_OP_SETALLOCHINT,
						      0);
800 801 802 803 804 805 806 807 808 809 810 811 812

	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);

813
static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
814 815 816 817 818 819 820
				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)
821
			ceph_msg_data_add_pages(msg, osd_data->pages,
822 823 824
					length, osd_data->alignment);
	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
		BUG_ON(!length);
825
		ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
826 827
#ifdef CONFIG_BLOCK
	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
828
		ceph_msg_data_add_bio(msg, osd_data->bio, length);
829 830 831 832 833 834
#endif
	} else {
		BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
	}
}

835 836
static u32 osd_req_encode_op(struct ceph_osd_op *dst,
			     const struct ceph_osd_req_op *src)
837 838 839 840 841 842 843 844 845 846 847 848
{
	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:
		break;
	case CEPH_OSD_OP_READ:
	case CEPH_OSD_OP_WRITE:
849
	case CEPH_OSD_OP_WRITEFULL:
L
Li Wang 已提交
850 851
	case CEPH_OSD_OP_ZERO:
	case CEPH_OSD_OP_TRUNCATE:
852 853 854 855 856 857 858 859 860 861
		dst->extent.offset = cpu_to_le64(src->extent.offset);
		dst->extent.length = cpu_to_le64(src->extent.length);
		dst->extent.truncate_size =
			cpu_to_le64(src->extent.truncate_size);
		dst->extent.truncate_seq =
			cpu_to_le32(src->extent.truncate_seq);
		break;
	case CEPH_OSD_OP_CALL:
		dst->cls.class_len = src->cls.class_len;
		dst->cls.method_len = src->cls.method_len;
862
		dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
863 864 865 866 867
		break;
	case CEPH_OSD_OP_STARTSYNC:
		break;
	case CEPH_OSD_OP_WATCH:
		dst->watch.cookie = cpu_to_le64(src->watch.cookie);
868 869 870 871 872
		dst->watch.ver = cpu_to_le64(0);
		dst->watch.op = src->watch.op;
		dst->watch.gen = cpu_to_le32(src->watch.gen);
		break;
	case CEPH_OSD_OP_NOTIFY_ACK:
873
		break;
874 875 876
	case CEPH_OSD_OP_NOTIFY:
		dst->notify.cookie = cpu_to_le64(src->notify.cookie);
		break;
877 878
	case CEPH_OSD_OP_LIST_WATCHERS:
		break;
879 880 881 882 883 884
	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;
885 886 887 888 889 890 891
	case CEPH_OSD_OP_SETXATTR:
	case CEPH_OSD_OP_CMPXATTR:
		dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
		dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
		dst->xattr.cmp_op = src->xattr.cmp_op;
		dst->xattr.cmp_mode = src->xattr.cmp_mode;
		break;
892 893 894
	case CEPH_OSD_OP_CREATE:
	case CEPH_OSD_OP_DELETE:
		break;
895
	default:
896
		pr_err("unsupported osd opcode %s\n",
897
			ceph_osd_op_name(src->op));
898
		WARN_ON(1);
899 900

		return 0;
901
	}
902

903
	dst->op = cpu_to_le16(src->op);
904
	dst->flags = cpu_to_le32(src->flags);
905
	dst->payload_len = cpu_to_le32(src->indata_len);
906

907
	return src->indata_len;
908 909
}

910 911 912 913 914 915 916 917 918 919 920 921 922 923
/*
 * 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,
924 925
					       u64 off, u64 *plen,
					       unsigned int which, int num_ops,
926 927 928 929
					       int opcode, int flags,
					       struct ceph_snap_context *snapc,
					       u32 truncate_seq,
					       u64 truncate_size,
930
					       bool use_mempool)
931
{
932
	struct ceph_osd_request *req;
933 934 935
	u64 objnum = 0;
	u64 objoff = 0;
	u64 objlen = 0;
936
	int r;
937

L
Li Wang 已提交
938
	BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
939 940
	       opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
	       opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
941

942
	req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
A
Alex Elder 已提交
943
					GFP_NOFS);
944 945 946 947
	if (!req) {
		r = -ENOMEM;
		goto fail;
	}
948

949
	/* calculate max write size */
950
	r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
951 952
	if (r)
		goto fail;
953

954
	if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
955
		osd_req_op_init(req, which, opcode, 0);
956
	} else {
957
		u32 object_size = layout->object_size;
958 959 960 961 962 963 964 965 966
		u32 object_base = off - objoff;
		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;
			}
967
		}
968
		osd_req_op_extent_init(req, which, opcode, objoff, objlen,
969 970
				       truncate_size, truncate_seq);
	}
971

972
	req->r_abort_on_full = true;
973
	req->r_flags = flags;
974
	req->r_base_oloc.pool = layout->pool_id;
975
	req->r_base_oloc.pool_ns = ceph_try_get_string(layout->pool_ns);
976
	ceph_oid_printf(&req->r_base_oid, "%llx.%08llx", vino.ino, objnum);
977

978 979 980 981
	req->r_snapid = vino.snap;
	if (flags & CEPH_OSD_FLAG_WRITE)
		req->r_data_offset = off;

982 983 984 985
	r = ceph_osdc_alloc_messages(req, GFP_NOFS);
	if (r)
		goto fail;

S
Sage Weil 已提交
986
	return req;
987 988 989 990

fail:
	ceph_osdc_put_request(req);
	return ERR_PTR(r);
S
Sage Weil 已提交
991
}
992
EXPORT_SYMBOL(ceph_osdc_new_request);
S
Sage Weil 已提交
993 994 995 996

/*
 * We keep osd requests in an rbtree, sorted by ->r_tid.
 */
I
Ilya Dryomov 已提交
997
DEFINE_RB_FUNCS(request, struct ceph_osd_request, r_tid, r_node)
I
Ilya Dryomov 已提交
998
DEFINE_RB_FUNCS(request_mc, struct ceph_osd_request, r_tid, r_mc_node)
S
Sage Weil 已提交
999

1000 1001 1002 1003 1004
static bool osd_homeless(struct ceph_osd *osd)
{
	return osd->o_osd == CEPH_HOMELESS_OSD;
}

1005
static bool osd_registered(struct ceph_osd *osd)
S
Sage Weil 已提交
1006
{
1007
	verify_osdc_locked(osd->o_osdc);
S
Sage Weil 已提交
1008

1009
	return !RB_EMPTY_NODE(&osd->o_node);
S
Sage Weil 已提交
1010 1011
}

1012 1013 1014 1015 1016
/*
 * Assumes @osd is zero-initialized.
 */
static void osd_init(struct ceph_osd *osd)
{
1017
	refcount_set(&osd->o_ref, 1);
1018
	RB_CLEAR_NODE(&osd->o_node);
1019
	osd->o_requests = RB_ROOT;
1020
	osd->o_linger_requests = RB_ROOT;
1021 1022 1023
	INIT_LIST_HEAD(&osd->o_osd_lru);
	INIT_LIST_HEAD(&osd->o_keepalive_item);
	osd->o_incarnation = 1;
1024
	mutex_init(&osd->lock);
1025 1026 1027 1028 1029
}

static void osd_cleanup(struct ceph_osd *osd)
{
	WARN_ON(!RB_EMPTY_NODE(&osd->o_node));
1030
	WARN_ON(!RB_EMPTY_ROOT(&osd->o_requests));
1031
	WARN_ON(!RB_EMPTY_ROOT(&osd->o_linger_requests));
1032 1033 1034 1035 1036 1037 1038 1039 1040
	WARN_ON(!list_empty(&osd->o_osd_lru));
	WARN_ON(!list_empty(&osd->o_keepalive_item));

	if (osd->o_auth.authorizer) {
		WARN_ON(osd_homeless(osd));
		ceph_auth_destroy_authorizer(osd->o_auth.authorizer);
	}
}

S
Sage Weil 已提交
1041 1042 1043
/*
 * Track open sessions with osds.
 */
1044
static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
S
Sage Weil 已提交
1045 1046 1047
{
	struct ceph_osd *osd;

1048 1049
	WARN_ON(onum == CEPH_HOMELESS_OSD);

1050
	osd = kzalloc(sizeof(*osd), GFP_NOIO | __GFP_NOFAIL);
1051
	osd_init(osd);
S
Sage Weil 已提交
1052
	osd->o_osdc = osdc;
1053
	osd->o_osd = onum;
S
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1054

1055
	ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1056

S
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1057 1058 1059 1060 1061
	return osd;
}

static struct ceph_osd *get_osd(struct ceph_osd *osd)
{
1062 1063 1064
	if (refcount_inc_not_zero(&osd->o_ref)) {
		dout("get_osd %p %d -> %d\n", osd, refcount_read(&osd->o_ref)-1,
		     refcount_read(&osd->o_ref));
S
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1065 1066 1067 1068 1069 1070 1071 1072 1073
		return osd;
	} else {
		dout("get_osd %p FAIL\n", osd);
		return NULL;
	}
}

static void put_osd(struct ceph_osd *osd)
{
1074 1075 1076
	dout("put_osd %p %d -> %d\n", osd, refcount_read(&osd->o_ref),
	     refcount_read(&osd->o_ref) - 1);
	if (refcount_dec_and_test(&osd->o_ref)) {
1077
		osd_cleanup(osd);
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1078
		kfree(osd);
S
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1079
	}
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1080 1081
}

I
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1082 1083
DEFINE_RB_FUNCS(osd, struct ceph_osd, o_osd, o_node)

1084
static void __move_osd_to_lru(struct ceph_osd *osd)
1085
{
1086 1087 1088
	struct ceph_osd_client *osdc = osd->o_osdc;

	dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1089
	BUG_ON(!list_empty(&osd->o_osd_lru));
1090

1091
	spin_lock(&osdc->osd_lru_lock);
1092
	list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1093 1094
	spin_unlock(&osdc->osd_lru_lock);

1095
	osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl;
1096 1097
}

1098
static void maybe_move_osd_to_lru(struct ceph_osd *osd)
1099
{
1100
	if (RB_EMPTY_ROOT(&osd->o_requests) &&
1101
	    RB_EMPTY_ROOT(&osd->o_linger_requests))
1102
		__move_osd_to_lru(osd);
1103 1104
}

1105 1106
static void __remove_osd_from_lru(struct ceph_osd *osd)
{
1107 1108 1109 1110 1111
	struct ceph_osd_client *osdc = osd->o_osdc;

	dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);

	spin_lock(&osdc->osd_lru_lock);
1112 1113
	if (!list_empty(&osd->o_osd_lru))
		list_del_init(&osd->o_osd_lru);
1114
	spin_unlock(&osdc->osd_lru_lock);
1115 1116
}

1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140
/*
 * Close the connection and assign any leftover requests to the
 * homeless session.
 */
static void close_osd(struct ceph_osd *osd)
{
	struct ceph_osd_client *osdc = osd->o_osdc;
	struct rb_node *n;

	verify_osdc_wrlocked(osdc);
	dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);

	ceph_con_close(&osd->o_con);

	for (n = rb_first(&osd->o_requests); n; ) {
		struct ceph_osd_request *req =
		    rb_entry(n, struct ceph_osd_request, r_node);

		n = rb_next(n); /* unlink_request() */

		dout(" reassigning req %p tid %llu\n", req, req->r_tid);
		unlink_request(osd, req);
		link_request(&osdc->homeless_osd, req);
	}
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
	for (n = rb_first(&osd->o_linger_requests); n; ) {
		struct ceph_osd_linger_request *lreq =
		    rb_entry(n, struct ceph_osd_linger_request, node);

		n = rb_next(n); /* unlink_linger() */

		dout(" reassigning lreq %p linger_id %llu\n", lreq,
		     lreq->linger_id);
		unlink_linger(osd, lreq);
		link_linger(&osdc->homeless_osd, lreq);
	}
1152 1153 1154 1155 1156 1157

	__remove_osd_from_lru(osd);
	erase_osd(&osdc->osds, osd);
	put_osd(osd);
}

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1158 1159 1160
/*
 * reset osd connect
 */
1161
static int reopen_osd(struct ceph_osd *osd)
S
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1162
{
A
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1163
	struct ceph_entity_addr *peer_addr;
S
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1164

1165 1166 1167
	dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);

	if (RB_EMPTY_ROOT(&osd->o_requests) &&
1168
	    RB_EMPTY_ROOT(&osd->o_linger_requests)) {
1169
		close_osd(osd);
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1170 1171 1172
		return -ENODEV;
	}

1173
	peer_addr = &osd->o_osdc->osdmap->osd_addr[osd->o_osd];
A
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1174 1175
	if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
			!ceph_con_opened(&osd->o_con)) {
1176
		struct rb_node *n;
A
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1177

1178 1179
		dout("osd addr hasn't changed and connection never opened, "
		     "letting msgr retry\n");
1180
		/* touch each r_stamp for handle_timeout()'s benfit */
1181 1182 1183
		for (n = rb_first(&osd->o_requests); n; n = rb_next(n)) {
			struct ceph_osd_request *req =
			    rb_entry(n, struct ceph_osd_request, r_node);
1184
			req->r_stamp = jiffies;
1185
		}
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1186 1187

		return -EAGAIN;
S
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1188
	}
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1189 1190 1191 1192 1193 1194

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

	return 0;
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1195 1196
}

1197 1198
static struct ceph_osd *lookup_create_osd(struct ceph_osd_client *osdc, int o,
					  bool wrlocked)
S
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1199
{
1200
	struct ceph_osd *osd;
1201

1202 1203 1204 1205
	if (wrlocked)
		verify_osdc_wrlocked(osdc);
	else
		verify_osdc_locked(osdc);
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1206

1207 1208 1209 1210 1211 1212 1213
	if (o != CEPH_HOMELESS_OSD)
		osd = lookup_osd(&osdc->osds, o);
	else
		osd = &osdc->homeless_osd;
	if (!osd) {
		if (!wrlocked)
			return ERR_PTR(-EAGAIN);
1214

1215 1216 1217 1218
		osd = create_osd(osdc, o);
		insert_osd(&osdc->osds, osd);
		ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd,
			      &osdc->osdmap->osd_addr[osd->o_osd]);
1219
	}
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1220

1221 1222
	dout("%s osdc %p osd%d -> osd %p\n", __func__, osdc, o, osd);
	return osd;
S
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1223 1224 1225
}

/*
1226 1227 1228
 * Create request <-> OSD session relation.
 *
 * @req has to be assigned a tid, @osd may be homeless.
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1229
 */
1230
static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req)
S
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1231
{
1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
	verify_osd_locked(osd);
	WARN_ON(!req->r_tid || req->r_osd);
	dout("%s osd %p osd%d req %p tid %llu\n", __func__, osd, osd->o_osd,
	     req, req->r_tid);

	if (!osd_homeless(osd))
		__remove_osd_from_lru(osd);
	else
		atomic_inc(&osd->o_osdc->num_homeless);

	get_osd(osd);
	insert_request(&osd->o_requests, req);
	req->r_osd = osd;
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1245 1246
}

1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263
static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req)
{
	verify_osd_locked(osd);
	WARN_ON(req->r_osd != osd);
	dout("%s osd %p osd%d req %p tid %llu\n", __func__, osd, osd->o_osd,
	     req, req->r_tid);

	req->r_osd = NULL;
	erase_request(&osd->o_requests, req);
	put_osd(osd);

	if (!osd_homeless(osd))
		maybe_move_osd_to_lru(osd);
	else
		atomic_dec(&osd->o_osdc->num_homeless);
}

1264 1265 1266 1267 1268
static bool __pool_full(struct ceph_pg_pool_info *pi)
{
	return pi->flags & CEPH_POOL_FLAG_FULL;
}

I
Ilya Dryomov 已提交
1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283
static bool have_pool_full(struct ceph_osd_client *osdc)
{
	struct rb_node *n;

	for (n = rb_first(&osdc->osdmap->pg_pools); n; n = rb_next(n)) {
		struct ceph_pg_pool_info *pi =
		    rb_entry(n, struct ceph_pg_pool_info, node);

		if (__pool_full(pi))
			return true;
	}

	return false;
}

1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294
static bool pool_full(struct ceph_osd_client *osdc, s64 pool_id)
{
	struct ceph_pg_pool_info *pi;

	pi = ceph_pg_pool_by_id(osdc->osdmap, pool_id);
	if (!pi)
		return false;

	return __pool_full(pi);
}

1295 1296 1297 1298
/*
 * Returns whether a request should be blocked from being sent
 * based on the current osdmap and osd_client settings.
 */
1299 1300 1301 1302
static bool target_should_be_paused(struct ceph_osd_client *osdc,
				    const struct ceph_osd_request_target *t,
				    struct ceph_pg_pool_info *pi)
{
1303 1304 1305
	bool pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
	bool pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
		       ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
1306 1307 1308
		       __pool_full(pi);

	WARN_ON(pi->id != t->base_oloc.pool);
1309 1310 1311
	return ((t->flags & CEPH_OSD_FLAG_READ) && pauserd) ||
	       ((t->flags & CEPH_OSD_FLAG_WRITE) && pausewr) ||
	       (osdc->osdmap->epoch < osdc->epoch_barrier);
1312 1313 1314 1315 1316 1317 1318 1319 1320 1321
}

enum calc_target_result {
	CALC_TARGET_NO_ACTION = 0,
	CALC_TARGET_NEED_RESEND,
	CALC_TARGET_POOL_DNE,
};

static enum calc_target_result calc_target(struct ceph_osd_client *osdc,
					   struct ceph_osd_request_target *t,
1322
					   struct ceph_connection *con,
1323 1324 1325 1326 1327 1328
					   bool any_change)
{
	struct ceph_pg_pool_info *pi;
	struct ceph_pg pgid, last_pgid;
	struct ceph_osds up, acting;
	bool force_resend = false;
1329 1330
	bool unpaused = false;
	bool legacy_change;
1331
	bool split = false;
1332
	bool need_check_tiering = false;
1333
	bool sort_bitwise = ceph_osdmap_flag(osdc, CEPH_OSDMAP_SORTBITWISE);
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344
	enum calc_target_result ct_res;
	int ret;

	pi = ceph_pg_pool_by_id(osdc->osdmap, t->base_oloc.pool);
	if (!pi) {
		t->osd = CEPH_HOMELESS_OSD;
		ct_res = CALC_TARGET_POOL_DNE;
		goto out;
	}

	if (osdc->osdmap->epoch == pi->last_force_request_resend) {
1345 1346
		if (t->last_force_resend < pi->last_force_request_resend) {
			t->last_force_resend = pi->last_force_request_resend;
1347
			force_resend = true;
1348
		} else if (t->last_force_resend == 0) {
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398
			force_resend = true;
		}
	}
	if (ceph_oid_empty(&t->target_oid) || force_resend) {
		ceph_oid_copy(&t->target_oid, &t->base_oid);
		need_check_tiering = true;
	}
	if (ceph_oloc_empty(&t->target_oloc) || force_resend) {
		ceph_oloc_copy(&t->target_oloc, &t->base_oloc);
		need_check_tiering = true;
	}

	if (need_check_tiering &&
	    (t->flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
		if (t->flags & CEPH_OSD_FLAG_READ && pi->read_tier >= 0)
			t->target_oloc.pool = pi->read_tier;
		if (t->flags & CEPH_OSD_FLAG_WRITE && pi->write_tier >= 0)
			t->target_oloc.pool = pi->write_tier;
	}

	ret = ceph_object_locator_to_pg(osdc->osdmap, &t->target_oid,
					&t->target_oloc, &pgid);
	if (ret) {
		WARN_ON(ret != -ENOENT);
		t->osd = CEPH_HOMELESS_OSD;
		ct_res = CALC_TARGET_POOL_DNE;
		goto out;
	}
	last_pgid.pool = pgid.pool;
	last_pgid.seed = ceph_stable_mod(pgid.seed, t->pg_num, t->pg_num_mask);

	ceph_pg_to_up_acting_osds(osdc->osdmap, &pgid, &up, &acting);
	if (any_change &&
	    ceph_is_new_interval(&t->acting,
				 &acting,
				 &t->up,
				 &up,
				 t->size,
				 pi->size,
				 t->min_size,
				 pi->min_size,
				 t->pg_num,
				 pi->pg_num,
				 t->sort_bitwise,
				 sort_bitwise,
				 &last_pgid))
		force_resend = true;

	if (t->paused && !target_should_be_paused(osdc, t, pi)) {
		t->paused = false;
1399
		unpaused = true;
1400
	}
1401 1402
	legacy_change = ceph_pg_compare(&t->pgid, &pgid) ||
			ceph_osds_changed(&t->acting, &acting, any_change);
1403 1404
	if (t->pg_num)
		split = ceph_pg_is_split(&last_pgid, t->pg_num, pi->pg_num);
1405

1406
	if (legacy_change || force_resend || split) {
1407
		t->pgid = pgid; /* struct */
1408
		ceph_pg_to_primary_shard(osdc->osdmap, &pgid, &t->spgid);
1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
		ceph_osds_copy(&t->acting, &acting);
		ceph_osds_copy(&t->up, &up);
		t->size = pi->size;
		t->min_size = pi->min_size;
		t->pg_num = pi->pg_num;
		t->pg_num_mask = pi->pg_num_mask;
		t->sort_bitwise = sort_bitwise;

		t->osd = acting.primary;
	}

1420 1421 1422
	if (unpaused || legacy_change || force_resend ||
	    (split && con && CEPH_HAVE_FEATURE(con->peer_features,
					       RESEND_ON_SPLIT)))
1423 1424 1425 1426
		ct_res = CALC_TARGET_NEED_RESEND;
	else
		ct_res = CALC_TARGET_NO_ACTION;

1427 1428 1429 1430 1431
out:
	dout("%s t %p -> ct_res %d osd %d\n", __func__, t, ct_res, t->osd);
	return ct_res;
}

1432 1433
static void setup_request_data(struct ceph_osd_request *req,
			       struct ceph_msg *msg)
S
Sage Weil 已提交
1434
{
1435 1436 1437 1438 1439
	u32 data_len = 0;
	int i;

	if (!list_empty(&msg->data))
		return;
S
Sage Weil 已提交
1440

1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
	WARN_ON(msg->data_length);
	for (i = 0; i < req->r_num_ops; i++) {
		struct ceph_osd_req_op *op = &req->r_ops[i];

		switch (op->op) {
		/* request */
		case CEPH_OSD_OP_WRITE:
		case CEPH_OSD_OP_WRITEFULL:
			WARN_ON(op->indata_len != op->extent.length);
			ceph_osdc_msg_data_add(msg, &op->extent.osd_data);
			break;
		case CEPH_OSD_OP_SETXATTR:
		case CEPH_OSD_OP_CMPXATTR:
			WARN_ON(op->indata_len != op->xattr.name_len +
						  op->xattr.value_len);
			ceph_osdc_msg_data_add(msg, &op->xattr.osd_data);
			break;
1458 1459 1460 1461
		case CEPH_OSD_OP_NOTIFY_ACK:
			ceph_osdc_msg_data_add(msg,
					       &op->notify_ack.request_data);
			break;
1462 1463 1464 1465 1466 1467 1468 1469 1470 1471

		/* reply */
		case CEPH_OSD_OP_STAT:
			ceph_osdc_msg_data_add(req->r_reply,
					       &op->raw_data_in);
			break;
		case CEPH_OSD_OP_READ:
			ceph_osdc_msg_data_add(req->r_reply,
					       &op->extent.osd_data);
			break;
1472 1473 1474 1475
		case CEPH_OSD_OP_LIST_WATCHERS:
			ceph_osdc_msg_data_add(req->r_reply,
					       &op->list_watchers.response_data);
			break;
1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488

		/* both */
		case CEPH_OSD_OP_CALL:
			WARN_ON(op->indata_len != op->cls.class_len +
						  op->cls.method_len +
						  op->cls.indata_len);
			ceph_osdc_msg_data_add(msg, &op->cls.request_info);
			/* optional, can be NONE */
			ceph_osdc_msg_data_add(msg, &op->cls.request_data);
			/* optional, can be NONE */
			ceph_osdc_msg_data_add(req->r_reply,
					       &op->cls.response_data);
			break;
1489 1490 1491 1492 1493 1494
		case CEPH_OSD_OP_NOTIFY:
			ceph_osdc_msg_data_add(msg,
					       &op->notify.request_data);
			ceph_osdc_msg_data_add(req->r_reply,
					       &op->notify.response_data);
			break;
1495 1496 1497 1498
		}

		data_len += op->indata_len;
	}
1499

1500 1501 1502
	WARN_ON(data_len != msg->data_length);
}

1503 1504 1505 1506 1507 1508 1509 1510
static void encode_pgid(void **p, const struct ceph_pg *pgid)
{
	ceph_encode_8(p, 1);
	ceph_encode_64(p, pgid->pool);
	ceph_encode_32(p, pgid->seed);
	ceph_encode_32(p, -1); /* preferred */
}

1511 1512 1513 1514 1515 1516 1517
static void encode_spgid(void **p, const struct ceph_spg *spgid)
{
	ceph_start_encoding(p, 1, 1, CEPH_PGID_ENCODING_LEN + 1);
	encode_pgid(p, &spgid->pgid);
	ceph_encode_8(p, spgid->shard);
}

1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531
static void encode_oloc(void **p, void *end,
			const struct ceph_object_locator *oloc)
{
	ceph_start_encoding(p, 5, 4, ceph_oloc_encoding_size(oloc));
	ceph_encode_64(p, oloc->pool);
	ceph_encode_32(p, -1); /* preferred */
	ceph_encode_32(p, 0);  /* key len */
	if (oloc->pool_ns)
		ceph_encode_string(p, end, oloc->pool_ns->str,
				   oloc->pool_ns->len);
	else
		ceph_encode_32(p, 0);
}

1532 1533
static void encode_request_partial(struct ceph_osd_request *req,
				   struct ceph_msg *msg)
1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549
{
	void *p = msg->front.iov_base;
	void *const end = p + msg->front_alloc_len;
	u32 data_len = 0;
	int i;

	if (req->r_flags & CEPH_OSD_FLAG_WRITE) {
		/* snapshots aren't writeable */
		WARN_ON(req->r_snapid != CEPH_NOSNAP);
	} else {
		WARN_ON(req->r_mtime.tv_sec || req->r_mtime.tv_nsec ||
			req->r_data_offset || req->r_snapc);
	}

	setup_request_data(req, msg);

1550 1551
	encode_spgid(&p, &req->r_t.spgid); /* actual spg */
	ceph_encode_32(&p, req->r_t.pgid.seed); /* raw hash */
1552 1553
	ceph_encode_32(&p, req->r_osdc->osdmap->epoch);
	ceph_encode_32(&p, req->r_flags);
1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564

	/* reqid */
	ceph_start_encoding(&p, 2, 2, sizeof(struct ceph_osd_reqid));
	memset(p, 0, sizeof(struct ceph_osd_reqid));
	p += sizeof(struct ceph_osd_reqid);

	/* trace */
	memset(p, 0, sizeof(struct ceph_blkin_trace_info));
	p += sizeof(struct ceph_blkin_trace_info);

	ceph_encode_32(&p, 0); /* client_inc, always 0 */
1565 1566
	ceph_encode_timespec(p, &req->r_mtime);
	p += sizeof(struct ceph_timespec);
1567

1568 1569 1570
	encode_oloc(&p, end, &req->r_t.target_oloc);
	ceph_encode_string(&p, end, req->r_t.target_oid.name,
			   req->r_t.target_oid.name_len);
S
Sage Weil 已提交
1571

1572 1573 1574 1575 1576 1577
	/* ops, can imply data */
	ceph_encode_16(&p, req->r_num_ops);
	for (i = 0; i < req->r_num_ops; i++) {
		data_len += osd_req_encode_op(p, &req->r_ops[i]);
		p += sizeof(struct ceph_osd_op);
	}
1578

1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590
	ceph_encode_64(&p, req->r_snapid); /* snapid */
	if (req->r_snapc) {
		ceph_encode_64(&p, req->r_snapc->seq);
		ceph_encode_32(&p, req->r_snapc->num_snaps);
		for (i = 0; i < req->r_snapc->num_snaps; i++)
			ceph_encode_64(&p, req->r_snapc->snaps[i]);
	} else {
		ceph_encode_64(&p, 0); /* snap_seq */
		ceph_encode_32(&p, 0); /* snaps len */
	}

	ceph_encode_32(&p, req->r_attempts); /* retry_attempt */
1591
	BUG_ON(p != end - 8); /* space for features */
1592

1593 1594
	msg->hdr.version = cpu_to_le16(8); /* MOSDOp v8 */
	/* front_len is finalized in encode_request_finish() */
1595 1596 1597 1598 1599 1600 1601
	msg->hdr.data_len = cpu_to_le32(data_len);
	/*
	 * 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).
	 */
	msg->hdr.data_off = cpu_to_le16(req->r_data_offset);
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 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695
	dout("%s req %p msg %p oid %s oid_len %d\n", __func__, req, msg,
	     req->r_t.target_oid.name, req->r_t.target_oid.name_len);
}

static void encode_request_finish(struct ceph_msg *msg)
{
	void *p = msg->front.iov_base;
	void *const end = p + msg->front_alloc_len;

	if (CEPH_HAVE_FEATURE(msg->con->peer_features, RESEND_ON_SPLIT)) {
		/* luminous OSD -- encode features and be done */
		p = end - 8;
		ceph_encode_64(&p, msg->con->peer_features);
	} else {
		struct {
			char spgid[CEPH_ENCODING_START_BLK_LEN +
				   CEPH_PGID_ENCODING_LEN + 1];
			__le32 hash;
			__le32 epoch;
			__le32 flags;
			char reqid[CEPH_ENCODING_START_BLK_LEN +
				   sizeof(struct ceph_osd_reqid)];
			char trace[sizeof(struct ceph_blkin_trace_info)];
			__le32 client_inc;
			struct ceph_timespec mtime;
		} __packed head;
		struct ceph_pg pgid;
		void *oloc, *oid, *tail;
		int oloc_len, oid_len, tail_len;
		int len;

		/*
		 * Pre-luminous OSD -- reencode v8 into v4 using @head
		 * as a temporary buffer.  Encode the raw PG; the rest
		 * is just a matter of moving oloc, oid and tail blobs
		 * around.
		 */
		memcpy(&head, p, sizeof(head));
		p += sizeof(head);

		oloc = p;
		p += CEPH_ENCODING_START_BLK_LEN;
		pgid.pool = ceph_decode_64(&p);
		p += 4 + 4; /* preferred, key len */
		len = ceph_decode_32(&p);
		p += len;   /* nspace */
		oloc_len = p - oloc;

		oid = p;
		len = ceph_decode_32(&p);
		p += len;
		oid_len = p - oid;

		tail = p;
		tail_len = (end - p) - 8;

		p = msg->front.iov_base;
		ceph_encode_copy(&p, &head.client_inc, sizeof(head.client_inc));
		ceph_encode_copy(&p, &head.epoch, sizeof(head.epoch));
		ceph_encode_copy(&p, &head.flags, sizeof(head.flags));
		ceph_encode_copy(&p, &head.mtime, sizeof(head.mtime));

		/* reassert_version */
		memset(p, 0, sizeof(struct ceph_eversion));
		p += sizeof(struct ceph_eversion);

		BUG_ON(p >= oloc);
		memmove(p, oloc, oloc_len);
		p += oloc_len;

		pgid.seed = le32_to_cpu(head.hash);
		encode_pgid(&p, &pgid); /* raw pg */

		BUG_ON(p >= oid);
		memmove(p, oid, oid_len);
		p += oid_len;

		/* tail -- ops, snapid, snapc, retry_attempt */
		BUG_ON(p >= tail);
		memmove(p, tail, tail_len);
		p += tail_len;

		msg->hdr.version = cpu_to_le16(4); /* MOSDOp v4 */
	}

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

	dout("%s msg %p tid %llu %u+%u+%u v%d\n", __func__, msg,
	     le64_to_cpu(msg->hdr.tid), le32_to_cpu(msg->hdr.front_len),
	     le32_to_cpu(msg->hdr.middle_len), le32_to_cpu(msg->hdr.data_len),
	     le16_to_cpu(msg->hdr.version));
1696 1697 1698 1699 1700 1701 1702 1703 1704
}

/*
 * @req has to be assigned a tid and registered.
 */
static void send_request(struct ceph_osd_request *req)
{
	struct ceph_osd *osd = req->r_osd;

1705
	verify_osd_locked(osd);
1706 1707
	WARN_ON(osd->o_osd != req->r_t.osd);

1708 1709 1710 1711 1712 1713 1714
	/*
	 * We may have a previously queued request message hanging
	 * around.  Cancel it to avoid corrupting the msgr.
	 */
	if (req->r_sent)
		ceph_msg_revoke(req->r_request);

1715 1716 1717 1718 1719 1720
	req->r_flags |= CEPH_OSD_FLAG_KNOWN_REDIR;
	if (req->r_attempts)
		req->r_flags |= CEPH_OSD_FLAG_RETRY;
	else
		WARN_ON(req->r_flags & CEPH_OSD_FLAG_RETRY);

1721
	encode_request_partial(req, req->r_request);
1722

1723
	dout("%s req %p tid %llu to pgid %llu.%x spgid %llu.%xs%d osd%d flags 0x%x attempt %d\n",
1724
	     __func__, req, req->r_tid, req->r_t.pgid.pool, req->r_t.pgid.seed,
1725 1726
	     req->r_t.spgid.pgid.pool, req->r_t.spgid.pgid.seed,
	     req->r_t.spgid.shard, osd->o_osd, req->r_flags, req->r_attempts);
1727 1728 1729 1730 1731 1732 1733 1734

	req->r_t.paused = false;
	req->r_stamp = jiffies;
	req->r_attempts++;

	req->r_sent = osd->o_incarnation;
	req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
	ceph_con_send(&osd->o_con, ceph_msg_get(req->r_request));
S
Sage Weil 已提交
1735 1736
}

I
Ilya Dryomov 已提交
1737 1738 1739 1740
static void maybe_request_map(struct ceph_osd_client *osdc)
{
	bool continuous = false;

1741
	verify_osdc_locked(osdc);
I
Ilya Dryomov 已提交
1742 1743
	WARN_ON(!osdc->osdmap->epoch);

1744 1745 1746
	if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
	    ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD) ||
	    ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
I
Ilya Dryomov 已提交
1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757
		dout("%s osdc %p continuous\n", __func__, osdc);
		continuous = true;
	} else {
		dout("%s osdc %p onetime\n", __func__, osdc);
	}

	if (ceph_monc_want_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
			       osdc->osdmap->epoch + 1, continuous))
		ceph_monc_renew_subs(&osdc->client->monc);
}

1758
static void complete_request(struct ceph_osd_request *req, int err);
I
Ilya Dryomov 已提交
1759 1760
static void send_map_check(struct ceph_osd_request *req);

1761
static void __submit_request(struct ceph_osd_request *req, bool wrlocked)
1762
{
1763 1764
	struct ceph_osd_client *osdc = req->r_osdc;
	struct ceph_osd *osd;
I
Ilya Dryomov 已提交
1765
	enum calc_target_result ct_res;
1766 1767
	bool need_send = false;
	bool promoted = false;
1768
	bool need_abort = false;
1769

I
Ilya Dryomov 已提交
1770
	WARN_ON(req->r_tid);
1771 1772 1773
	dout("%s req %p wrlocked %d\n", __func__, req, wrlocked);

again:
1774
	ct_res = calc_target(osdc, &req->r_t, NULL, false);
I
Ilya Dryomov 已提交
1775 1776 1777
	if (ct_res == CALC_TARGET_POOL_DNE && !wrlocked)
		goto promote;

1778 1779 1780 1781
	osd = lookup_create_osd(osdc, req->r_t.osd, wrlocked);
	if (IS_ERR(osd)) {
		WARN_ON(PTR_ERR(osd) != -EAGAIN || wrlocked);
		goto promote;
1782 1783
	}

1784 1785 1786 1787 1788 1789 1790
	if (osdc->osdmap->epoch < osdc->epoch_barrier) {
		dout("req %p epoch %u barrier %u\n", req, osdc->osdmap->epoch,
		     osdc->epoch_barrier);
		req->r_t.paused = true;
		maybe_request_map(osdc);
	} else if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
		   ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
1791 1792 1793 1794
		dout("req %p pausewr\n", req);
		req->r_t.paused = true;
		maybe_request_map(osdc);
	} else if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
1795
		   ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD)) {
1796 1797 1798 1799 1800 1801
		dout("req %p pauserd\n", req);
		req->r_t.paused = true;
		maybe_request_map(osdc);
	} else if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
		   !(req->r_flags & (CEPH_OSD_FLAG_FULL_TRY |
				     CEPH_OSD_FLAG_FULL_FORCE)) &&
1802
		   (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
1803 1804 1805 1806 1807
		    pool_full(osdc, req->r_t.base_oloc.pool))) {
		dout("req %p full/pool_full\n", req);
		pr_warn_ratelimited("FULL or reached pool quota\n");
		req->r_t.paused = true;
		maybe_request_map(osdc);
1808 1809
		if (req->r_abort_on_full)
			need_abort = true;
1810 1811
	} else if (!osd_homeless(osd)) {
		need_send = true;
1812
	} else {
1813
		maybe_request_map(osdc);
1814 1815
	}

1816 1817 1818 1819 1820 1821 1822 1823 1824 1825
	mutex_lock(&osd->lock);
	/*
	 * Assign the tid atomically with send_request() to protect
	 * multiple writes to the same object from racing with each
	 * other, resulting in out of order ops on the OSDs.
	 */
	req->r_tid = atomic64_inc_return(&osdc->last_tid);
	link_request(osd, req);
	if (need_send)
		send_request(req);
1826 1827
	else if (need_abort)
		complete_request(req, -ENOSPC);
1828 1829
	mutex_unlock(&osd->lock);

I
Ilya Dryomov 已提交
1830 1831 1832
	if (ct_res == CALC_TARGET_POOL_DNE)
		send_map_check(req);

1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846
	if (promoted)
		downgrade_write(&osdc->lock);
	return;

promote:
	up_read(&osdc->lock);
	down_write(&osdc->lock);
	wrlocked = true;
	promoted = true;
	goto again;
}

static void account_request(struct ceph_osd_request *req)
{
1847
	WARN_ON(req->r_flags & (CEPH_OSD_FLAG_ACK | CEPH_OSD_FLAG_ONDISK));
I
Ilya Dryomov 已提交
1848
	WARN_ON(!(req->r_flags & (CEPH_OSD_FLAG_READ | CEPH_OSD_FLAG_WRITE)));
1849

I
Ilya Dryomov 已提交
1850
	req->r_flags |= CEPH_OSD_FLAG_ONDISK;
1851
	atomic_inc(&req->r_osdc->num_requests);
1852 1853

	req->r_start_stamp = jiffies;
1854 1855 1856 1857 1858 1859 1860 1861 1862
}

static void submit_request(struct ceph_osd_request *req, bool wrlocked)
{
	ceph_osdc_get_request(req);
	account_request(req);
	__submit_request(req, wrlocked);
}

1863
static void finish_request(struct ceph_osd_request *req)
1864 1865 1866 1867 1868 1869 1870
{
	struct ceph_osd_client *osdc = req->r_osdc;
	struct ceph_osd *osd = req->r_osd;

	verify_osd_locked(osd);
	dout("%s req %p tid %llu\n", __func__, req, req->r_tid);

I
Ilya Dryomov 已提交
1871
	WARN_ON(lookup_request_mc(&osdc->map_checks, req->r_tid));
1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884
	unlink_request(osd, req);
	atomic_dec(&osdc->num_requests);

	/*
	 * If an OSD has failed or returned and a request has been sent
	 * twice, it's possible to get a reply and end up here while the
	 * request message is queued for delivery.  We will ignore the
	 * reply, so not a big deal, but better to try and catch it.
	 */
	ceph_msg_revoke(req->r_request);
	ceph_msg_revoke_incoming(req->r_reply);
}

1885 1886
static void __complete_request(struct ceph_osd_request *req)
{
I
Ilya Dryomov 已提交
1887 1888 1889
	if (req->r_callback) {
		dout("%s req %p tid %llu cb %pf result %d\n", __func__, req,
		     req->r_tid, req->r_callback, req->r_result);
1890
		req->r_callback(req);
I
Ilya Dryomov 已提交
1891
	}
1892 1893
}

I
Ilya Dryomov 已提交
1894
/*
I
Ilya Dryomov 已提交
1895
 * This is open-coded in handle_reply().
I
Ilya Dryomov 已提交
1896 1897 1898 1899 1900 1901
 */
static void complete_request(struct ceph_osd_request *req, int err)
{
	dout("%s req %p tid %llu err %d\n", __func__, req, req->r_tid, err);

	req->r_result = err;
1902
	finish_request(req);
I
Ilya Dryomov 已提交
1903
	__complete_request(req);
I
Ilya Dryomov 已提交
1904
	complete_all(&req->r_completion);
I
Ilya Dryomov 已提交
1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923
	ceph_osdc_put_request(req);
}

static void cancel_map_check(struct ceph_osd_request *req)
{
	struct ceph_osd_client *osdc = req->r_osdc;
	struct ceph_osd_request *lookup_req;

	verify_osdc_wrlocked(osdc);

	lookup_req = lookup_request_mc(&osdc->map_checks, req->r_tid);
	if (!lookup_req)
		return;

	WARN_ON(lookup_req != req);
	erase_request_mc(&osdc->map_checks, req);
	ceph_osdc_put_request(req);
}

1924 1925 1926 1927
static void cancel_request(struct ceph_osd_request *req)
{
	dout("%s req %p tid %llu\n", __func__, req, req->r_tid);

I
Ilya Dryomov 已提交
1928
	cancel_map_check(req);
1929
	finish_request(req);
I
Ilya Dryomov 已提交
1930
	complete_all(&req->r_completion);
1931
	ceph_osdc_put_request(req);
1932 1933
}

1934 1935 1936 1937 1938 1939 1940 1941
static void abort_request(struct ceph_osd_request *req, int err)
{
	dout("%s req %p tid %llu err %d\n", __func__, req, req->r_tid, err);

	cancel_map_check(req);
	complete_request(req, err);
}

1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967
static void update_epoch_barrier(struct ceph_osd_client *osdc, u32 eb)
{
	if (likely(eb > osdc->epoch_barrier)) {
		dout("updating epoch_barrier from %u to %u\n",
				osdc->epoch_barrier, eb);
		osdc->epoch_barrier = eb;
		/* Request map if we're not to the barrier yet */
		if (eb > osdc->osdmap->epoch)
			maybe_request_map(osdc);
	}
}

void ceph_osdc_update_epoch_barrier(struct ceph_osd_client *osdc, u32 eb)
{
	down_read(&osdc->lock);
	if (unlikely(eb > osdc->epoch_barrier)) {
		up_read(&osdc->lock);
		down_write(&osdc->lock);
		update_epoch_barrier(osdc, eb);
		up_write(&osdc->lock);
	} else {
		up_read(&osdc->lock);
	}
}
EXPORT_SYMBOL(ceph_osdc_update_epoch_barrier);

1968 1969
/*
 * Drop all pending requests that are stalled waiting on a full condition to
1970 1971 1972
 * clear, and complete them with ENOSPC as the return code. Set the
 * osdc->epoch_barrier to the latest map epoch that we've seen if any were
 * cancelled.
1973 1974 1975 1976
 */
static void ceph_osdc_abort_on_full(struct ceph_osd_client *osdc)
{
	struct rb_node *n;
1977
	bool victims = false;
1978 1979 1980 1981 1982 1983

	dout("enter abort_on_full\n");

	if (!ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) && !have_pool_full(osdc))
		goto out;

1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
	/* Scan list and see if there is anything to abort */
	for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
		struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
		struct rb_node *m;

		m = rb_first(&osd->o_requests);
		while (m) {
			struct ceph_osd_request *req = rb_entry(m,
					struct ceph_osd_request, r_node);
			m = rb_next(m);

			if (req->r_abort_on_full) {
				victims = true;
				break;
			}
		}
		if (victims)
			break;
	}

	if (!victims)
		goto out;

	/*
	 * Update the barrier to current epoch if it's behind that point,
	 * since we know we have some calls to be aborted in the tree.
	 */
	update_epoch_barrier(osdc, osdc->osdmap->epoch);

2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029
	for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
		struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
		struct rb_node *m;

		m = rb_first(&osd->o_requests);
		while (m) {
			struct ceph_osd_request *req = rb_entry(m,
					struct ceph_osd_request, r_node);
			m = rb_next(m);

			if (req->r_abort_on_full &&
			    (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
			     pool_full(osdc, req->r_t.target_oloc.pool)))
				abort_request(req, -ENOSPC);
		}
	}
out:
2030
	dout("return abort_on_full barrier=%u\n", osdc->epoch_barrier);
2031 2032
}

I
Ilya Dryomov 已提交
2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114
static void check_pool_dne(struct ceph_osd_request *req)
{
	struct ceph_osd_client *osdc = req->r_osdc;
	struct ceph_osdmap *map = osdc->osdmap;

	verify_osdc_wrlocked(osdc);
	WARN_ON(!map->epoch);

	if (req->r_attempts) {
		/*
		 * We sent a request earlier, which means that
		 * previously the pool existed, and now it does not
		 * (i.e., it was deleted).
		 */
		req->r_map_dne_bound = map->epoch;
		dout("%s req %p tid %llu pool disappeared\n", __func__, req,
		     req->r_tid);
	} else {
		dout("%s req %p tid %llu map_dne_bound %u have %u\n", __func__,
		     req, req->r_tid, req->r_map_dne_bound, map->epoch);
	}

	if (req->r_map_dne_bound) {
		if (map->epoch >= req->r_map_dne_bound) {
			/* we had a new enough map */
			pr_info_ratelimited("tid %llu pool does not exist\n",
					    req->r_tid);
			complete_request(req, -ENOENT);
		}
	} else {
		send_map_check(req);
	}
}

static void map_check_cb(struct ceph_mon_generic_request *greq)
{
	struct ceph_osd_client *osdc = &greq->monc->client->osdc;
	struct ceph_osd_request *req;
	u64 tid = greq->private_data;

	WARN_ON(greq->result || !greq->u.newest);

	down_write(&osdc->lock);
	req = lookup_request_mc(&osdc->map_checks, tid);
	if (!req) {
		dout("%s tid %llu dne\n", __func__, tid);
		goto out_unlock;
	}

	dout("%s req %p tid %llu map_dne_bound %u newest %llu\n", __func__,
	     req, req->r_tid, req->r_map_dne_bound, greq->u.newest);
	if (!req->r_map_dne_bound)
		req->r_map_dne_bound = greq->u.newest;
	erase_request_mc(&osdc->map_checks, req);
	check_pool_dne(req);

	ceph_osdc_put_request(req);
out_unlock:
	up_write(&osdc->lock);
}

static void send_map_check(struct ceph_osd_request *req)
{
	struct ceph_osd_client *osdc = req->r_osdc;
	struct ceph_osd_request *lookup_req;
	int ret;

	verify_osdc_wrlocked(osdc);

	lookup_req = lookup_request_mc(&osdc->map_checks, req->r_tid);
	if (lookup_req) {
		WARN_ON(lookup_req != req);
		return;
	}

	ceph_osdc_get_request(req);
	insert_request_mc(&osdc->map_checks, req);
	ret = ceph_monc_get_version_async(&osdc->client->monc, "osdmap",
					  map_check_cb, req->r_tid);
	WARN_ON(ret);
}

2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126
/*
 * lingering requests, watch/notify v2 infrastructure
 */
static void linger_release(struct kref *kref)
{
	struct ceph_osd_linger_request *lreq =
	    container_of(kref, struct ceph_osd_linger_request, kref);

	dout("%s lreq %p reg_req %p ping_req %p\n", __func__, lreq,
	     lreq->reg_req, lreq->ping_req);
	WARN_ON(!RB_EMPTY_NODE(&lreq->node));
	WARN_ON(!RB_EMPTY_NODE(&lreq->osdc_node));
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Ilya Dryomov 已提交
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	WARN_ON(!RB_EMPTY_NODE(&lreq->mc_node));
2128
	WARN_ON(!list_empty(&lreq->scan_item));
2129
	WARN_ON(!list_empty(&lreq->pending_lworks));
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	WARN_ON(lreq->osd);

	if (lreq->reg_req)
		ceph_osdc_put_request(lreq->reg_req);
	if (lreq->ping_req)
		ceph_osdc_put_request(lreq->ping_req);
	target_destroy(&lreq->t);
	kfree(lreq);
}

static void linger_put(struct ceph_osd_linger_request *lreq)
{
	if (lreq)
		kref_put(&lreq->kref, linger_release);
}

static struct ceph_osd_linger_request *
linger_get(struct ceph_osd_linger_request *lreq)
{
	kref_get(&lreq->kref);
	return lreq;
}

static struct ceph_osd_linger_request *
linger_alloc(struct ceph_osd_client *osdc)
{
	struct ceph_osd_linger_request *lreq;

	lreq = kzalloc(sizeof(*lreq), GFP_NOIO);
	if (!lreq)
		return NULL;

	kref_init(&lreq->kref);
	mutex_init(&lreq->lock);
	RB_CLEAR_NODE(&lreq->node);
	RB_CLEAR_NODE(&lreq->osdc_node);
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Ilya Dryomov 已提交
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	RB_CLEAR_NODE(&lreq->mc_node);
2167
	INIT_LIST_HEAD(&lreq->scan_item);
2168
	INIT_LIST_HEAD(&lreq->pending_lworks);
2169
	init_completion(&lreq->reg_commit_wait);
2170
	init_completion(&lreq->notify_finish_wait);
2171 2172 2173 2174 2175 2176 2177 2178 2179 2180

	lreq->osdc = osdc;
	target_init(&lreq->t);

	dout("%s lreq %p\n", __func__, lreq);
	return lreq;
}

DEFINE_RB_INSDEL_FUNCS(linger, struct ceph_osd_linger_request, linger_id, node)
DEFINE_RB_FUNCS(linger_osdc, struct ceph_osd_linger_request, linger_id, osdc_node)
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Ilya Dryomov 已提交
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DEFINE_RB_FUNCS(linger_mc, struct ceph_osd_linger_request, linger_id, mc_node)
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/*
 * Create linger request <-> OSD session relation.
 *
 * @lreq has to be registered, @osd may be homeless.
 */
static void link_linger(struct ceph_osd *osd,
			struct ceph_osd_linger_request *lreq)
{
	verify_osd_locked(osd);
	WARN_ON(!lreq->linger_id || lreq->osd);
	dout("%s osd %p osd%d lreq %p linger_id %llu\n", __func__, osd,
	     osd->o_osd, lreq, lreq->linger_id);

	if (!osd_homeless(osd))
		__remove_osd_from_lru(osd);
	else
		atomic_inc(&osd->o_osdc->num_homeless);

	get_osd(osd);
	insert_linger(&osd->o_linger_requests, lreq);
	lreq->osd = osd;
}

static void unlink_linger(struct ceph_osd *osd,
			  struct ceph_osd_linger_request *lreq)
{
	verify_osd_locked(osd);
	WARN_ON(lreq->osd != osd);
	dout("%s osd %p osd%d lreq %p linger_id %llu\n", __func__, osd,
	     osd->o_osd, lreq, lreq->linger_id);

	lreq->osd = NULL;
	erase_linger(&osd->o_linger_requests, lreq);
	put_osd(osd);

	if (!osd_homeless(osd))
		maybe_move_osd_to_lru(osd);
	else
		atomic_dec(&osd->o_osdc->num_homeless);
}

static bool __linger_registered(struct ceph_osd_linger_request *lreq)
{
	verify_osdc_locked(lreq->osdc);

	return !RB_EMPTY_NODE(&lreq->osdc_node);
}

static bool linger_registered(struct ceph_osd_linger_request *lreq)
{
	struct ceph_osd_client *osdc = lreq->osdc;
	bool registered;

	down_read(&osdc->lock);
	registered = __linger_registered(lreq);
	up_read(&osdc->lock);

	return registered;
}

static void linger_register(struct ceph_osd_linger_request *lreq)
{
	struct ceph_osd_client *osdc = lreq->osdc;

	verify_osdc_wrlocked(osdc);
	WARN_ON(lreq->linger_id);

	linger_get(lreq);
	lreq->linger_id = ++osdc->last_linger_id;
	insert_linger_osdc(&osdc->linger_requests, lreq);
}

static void linger_unregister(struct ceph_osd_linger_request *lreq)
{
	struct ceph_osd_client *osdc = lreq->osdc;

	verify_osdc_wrlocked(osdc);

	erase_linger_osdc(&osdc->linger_requests, lreq);
	linger_put(lreq);
}

static void cancel_linger_request(struct ceph_osd_request *req)
{
	struct ceph_osd_linger_request *lreq = req->r_priv;

	WARN_ON(!req->r_linger);
	cancel_request(req);
	linger_put(lreq);
}

struct linger_work {
	struct work_struct work;
	struct ceph_osd_linger_request *lreq;
2277 2278
	struct list_head pending_item;
	unsigned long queued_stamp;
2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304

	union {
		struct {
			u64 notify_id;
			u64 notifier_id;
			void *payload; /* points into @msg front */
			size_t payload_len;

			struct ceph_msg *msg; /* for ceph_msg_put() */
		} notify;
		struct {
			int err;
		} error;
	};
};

static struct linger_work *lwork_alloc(struct ceph_osd_linger_request *lreq,
				       work_func_t workfn)
{
	struct linger_work *lwork;

	lwork = kzalloc(sizeof(*lwork), GFP_NOIO);
	if (!lwork)
		return NULL;

	INIT_WORK(&lwork->work, workfn);
2305
	INIT_LIST_HEAD(&lwork->pending_item);
2306 2307 2308 2309 2310 2311 2312 2313 2314
	lwork->lreq = linger_get(lreq);

	return lwork;
}

static void lwork_free(struct linger_work *lwork)
{
	struct ceph_osd_linger_request *lreq = lwork->lreq;

2315 2316 2317 2318
	mutex_lock(&lreq->lock);
	list_del(&lwork->pending_item);
	mutex_unlock(&lreq->lock);

2319 2320 2321 2322 2323 2324 2325 2326 2327 2328
	linger_put(lreq);
	kfree(lwork);
}

static void lwork_queue(struct linger_work *lwork)
{
	struct ceph_osd_linger_request *lreq = lwork->lreq;
	struct ceph_osd_client *osdc = lreq->osdc;

	verify_lreq_locked(lreq);
2329 2330 2331 2332
	WARN_ON(!list_empty(&lwork->pending_item));

	lwork->queued_stamp = jiffies;
	list_add_tail(&lwork->pending_item, &lreq->pending_lworks);
2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345
	queue_work(osdc->notify_wq, &lwork->work);
}

static void do_watch_notify(struct work_struct *w)
{
	struct linger_work *lwork = container_of(w, struct linger_work, work);
	struct ceph_osd_linger_request *lreq = lwork->lreq;

	if (!linger_registered(lreq)) {
		dout("%s lreq %p not registered\n", __func__, lreq);
		goto out;
	}

2346
	WARN_ON(!lreq->is_watch);
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	dout("%s lreq %p notify_id %llu notifier_id %llu payload_len %zu\n",
	     __func__, lreq, lwork->notify.notify_id, lwork->notify.notifier_id,
	     lwork->notify.payload_len);
	lreq->wcb(lreq->data, lwork->notify.notify_id, lreq->linger_id,
		  lwork->notify.notifier_id, lwork->notify.payload,
		  lwork->notify.payload_len);

out:
	ceph_msg_put(lwork->notify.msg);
	lwork_free(lwork);
}

static void do_watch_error(struct work_struct *w)
{
	struct linger_work *lwork = container_of(w, struct linger_work, work);
	struct ceph_osd_linger_request *lreq = lwork->lreq;

	if (!linger_registered(lreq)) {
		dout("%s lreq %p not registered\n", __func__, lreq);
		goto out;
	}

	dout("%s lreq %p err %d\n", __func__, lreq, lwork->error.err);
	lreq->errcb(lreq->data, lreq->linger_id, lwork->error.err);

out:
	lwork_free(lwork);
}

static void queue_watch_error(struct ceph_osd_linger_request *lreq)
{
	struct linger_work *lwork;

	lwork = lwork_alloc(lreq, do_watch_error);
	if (!lwork) {
		pr_err("failed to allocate error-lwork\n");
		return;
	}

	lwork->error.err = lreq->last_error;
	lwork_queue(lwork);
}

static void linger_reg_commit_complete(struct ceph_osd_linger_request *lreq,
				       int result)
{
	if (!completion_done(&lreq->reg_commit_wait)) {
		lreq->reg_commit_error = (result <= 0 ? result : 0);
		complete_all(&lreq->reg_commit_wait);
	}
}

static void linger_commit_cb(struct ceph_osd_request *req)
{
	struct ceph_osd_linger_request *lreq = req->r_priv;

	mutex_lock(&lreq->lock);
	dout("%s lreq %p linger_id %llu result %d\n", __func__, lreq,
	     lreq->linger_id, req->r_result);
	linger_reg_commit_complete(lreq, req->r_result);
	lreq->committed = true;

2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426
	if (!lreq->is_watch) {
		struct ceph_osd_data *osd_data =
		    osd_req_op_data(req, 0, notify, response_data);
		void *p = page_address(osd_data->pages[0]);

		WARN_ON(req->r_ops[0].op != CEPH_OSD_OP_NOTIFY ||
			osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);

		/* make note of the notify_id */
		if (req->r_ops[0].outdata_len >= sizeof(u64)) {
			lreq->notify_id = ceph_decode_64(&p);
			dout("lreq %p notify_id %llu\n", lreq,
			     lreq->notify_id);
		} else {
			dout("lreq %p no notify_id\n", lreq);
		}
	}

2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 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
	mutex_unlock(&lreq->lock);
	linger_put(lreq);
}

static int normalize_watch_error(int err)
{
	/*
	 * Translate ENOENT -> ENOTCONN so that a delete->disconnection
	 * notification and a failure to reconnect because we raced with
	 * the delete appear the same to the user.
	 */
	if (err == -ENOENT)
		err = -ENOTCONN;

	return err;
}

static void linger_reconnect_cb(struct ceph_osd_request *req)
{
	struct ceph_osd_linger_request *lreq = req->r_priv;

	mutex_lock(&lreq->lock);
	dout("%s lreq %p linger_id %llu result %d last_error %d\n", __func__,
	     lreq, lreq->linger_id, req->r_result, lreq->last_error);
	if (req->r_result < 0) {
		if (!lreq->last_error) {
			lreq->last_error = normalize_watch_error(req->r_result);
			queue_watch_error(lreq);
		}
	}

	mutex_unlock(&lreq->lock);
	linger_put(lreq);
}

static void send_linger(struct ceph_osd_linger_request *lreq)
{
	struct ceph_osd_request *req = lreq->reg_req;
	struct ceph_osd_req_op *op = &req->r_ops[0];

	verify_osdc_wrlocked(req->r_osdc);
	dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);

	if (req->r_osd)
		cancel_linger_request(req);

	request_reinit(req);
	ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
	ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
	req->r_flags = lreq->t.flags;
	req->r_mtime = lreq->mtime;

	mutex_lock(&lreq->lock);
2480
	if (lreq->is_watch && lreq->committed) {
2481 2482 2483 2484 2485 2486 2487 2488
		WARN_ON(op->op != CEPH_OSD_OP_WATCH ||
			op->watch.cookie != lreq->linger_id);
		op->watch.op = CEPH_OSD_WATCH_OP_RECONNECT;
		op->watch.gen = ++lreq->register_gen;
		dout("lreq %p reconnect register_gen %u\n", lreq,
		     op->watch.gen);
		req->r_callback = linger_reconnect_cb;
	} else {
2489 2490 2491 2492
		if (!lreq->is_watch)
			lreq->notify_id = 0;
		else
			WARN_ON(op->watch.op != CEPH_OSD_WATCH_OP_WATCH);
2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512
		dout("lreq %p register\n", lreq);
		req->r_callback = linger_commit_cb;
	}
	mutex_unlock(&lreq->lock);

	req->r_priv = linger_get(lreq);
	req->r_linger = true;

	submit_request(req, true);
}

static void linger_ping_cb(struct ceph_osd_request *req)
{
	struct ceph_osd_linger_request *lreq = req->r_priv;

	mutex_lock(&lreq->lock);
	dout("%s lreq %p linger_id %llu result %d ping_sent %lu last_error %d\n",
	     __func__, lreq, lreq->linger_id, req->r_result, lreq->ping_sent,
	     lreq->last_error);
	if (lreq->register_gen == req->r_ops[0].watch.gen) {
2513 2514 2515
		if (!req->r_result) {
			lreq->watch_valid_thru = lreq->ping_sent;
		} else if (!lreq->last_error) {
2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533
			lreq->last_error = normalize_watch_error(req->r_result);
			queue_watch_error(lreq);
		}
	} else {
		dout("lreq %p register_gen %u ignoring old pong %u\n", lreq,
		     lreq->register_gen, req->r_ops[0].watch.gen);
	}

	mutex_unlock(&lreq->lock);
	linger_put(lreq);
}

static void send_linger_ping(struct ceph_osd_linger_request *lreq)
{
	struct ceph_osd_client *osdc = lreq->osdc;
	struct ceph_osd_request *req = lreq->ping_req;
	struct ceph_osd_req_op *op = &req->r_ops[0];

2534
	if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD)) {
2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569
		dout("%s PAUSERD\n", __func__);
		return;
	}

	lreq->ping_sent = jiffies;
	dout("%s lreq %p linger_id %llu ping_sent %lu register_gen %u\n",
	     __func__, lreq, lreq->linger_id, lreq->ping_sent,
	     lreq->register_gen);

	if (req->r_osd)
		cancel_linger_request(req);

	request_reinit(req);
	target_copy(&req->r_t, &lreq->t);

	WARN_ON(op->op != CEPH_OSD_OP_WATCH ||
		op->watch.cookie != lreq->linger_id ||
		op->watch.op != CEPH_OSD_WATCH_OP_PING);
	op->watch.gen = lreq->register_gen;
	req->r_callback = linger_ping_cb;
	req->r_priv = linger_get(lreq);
	req->r_linger = true;

	ceph_osdc_get_request(req);
	account_request(req);
	req->r_tid = atomic64_inc_return(&osdc->last_tid);
	link_request(lreq->osd, req);
	send_request(req);
}

static void linger_submit(struct ceph_osd_linger_request *lreq)
{
	struct ceph_osd_client *osdc = lreq->osdc;
	struct ceph_osd *osd;

2570
	calc_target(osdc, &lreq->t, NULL, false);
2571 2572 2573 2574 2575 2576
	osd = lookup_create_osd(osdc, lreq->t.osd, true);
	link_linger(osd, lreq);

	send_linger(lreq);
}

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Ilya Dryomov 已提交
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static void cancel_linger_map_check(struct ceph_osd_linger_request *lreq)
{
	struct ceph_osd_client *osdc = lreq->osdc;
	struct ceph_osd_linger_request *lookup_lreq;

	verify_osdc_wrlocked(osdc);

	lookup_lreq = lookup_linger_mc(&osdc->linger_map_checks,
				       lreq->linger_id);
	if (!lookup_lreq)
		return;

	WARN_ON(lookup_lreq != lreq);
	erase_linger_mc(&osdc->linger_map_checks, lreq);
	linger_put(lreq);
}

2594 2595 2596 2597 2598
/*
 * @lreq has to be both registered and linked.
 */
static void __linger_cancel(struct ceph_osd_linger_request *lreq)
{
2599
	if (lreq->is_watch && lreq->ping_req->r_osd)
2600 2601 2602
		cancel_linger_request(lreq->ping_req);
	if (lreq->reg_req->r_osd)
		cancel_linger_request(lreq->reg_req);
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Ilya Dryomov 已提交
2603
	cancel_linger_map_check(lreq);
2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617
	unlink_linger(lreq->osd, lreq);
	linger_unregister(lreq);
}

static void linger_cancel(struct ceph_osd_linger_request *lreq)
{
	struct ceph_osd_client *osdc = lreq->osdc;

	down_write(&osdc->lock);
	if (__linger_registered(lreq))
		__linger_cancel(lreq);
	up_write(&osdc->lock);
}

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Ilya Dryomov 已提交
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static void send_linger_map_check(struct ceph_osd_linger_request *lreq);

static void check_linger_pool_dne(struct ceph_osd_linger_request *lreq)
{
	struct ceph_osd_client *osdc = lreq->osdc;
	struct ceph_osdmap *map = osdc->osdmap;

	verify_osdc_wrlocked(osdc);
	WARN_ON(!map->epoch);

	if (lreq->register_gen) {
		lreq->map_dne_bound = map->epoch;
		dout("%s lreq %p linger_id %llu pool disappeared\n", __func__,
		     lreq, lreq->linger_id);
	} else {
		dout("%s lreq %p linger_id %llu map_dne_bound %u have %u\n",
		     __func__, lreq, lreq->linger_id, lreq->map_dne_bound,
		     map->epoch);
	}

	if (lreq->map_dne_bound) {
		if (map->epoch >= lreq->map_dne_bound) {
			/* we had a new enough map */
			pr_info("linger_id %llu pool does not exist\n",
				lreq->linger_id);
			linger_reg_commit_complete(lreq, -ENOENT);
			__linger_cancel(lreq);
		}
	} else {
		send_linger_map_check(lreq);
	}
}

static void linger_map_check_cb(struct ceph_mon_generic_request *greq)
{
	struct ceph_osd_client *osdc = &greq->monc->client->osdc;
	struct ceph_osd_linger_request *lreq;
	u64 linger_id = greq->private_data;

	WARN_ON(greq->result || !greq->u.newest);

	down_write(&osdc->lock);
	lreq = lookup_linger_mc(&osdc->linger_map_checks, linger_id);
	if (!lreq) {
		dout("%s linger_id %llu dne\n", __func__, linger_id);
		goto out_unlock;
	}

	dout("%s lreq %p linger_id %llu map_dne_bound %u newest %llu\n",
	     __func__, lreq, lreq->linger_id, lreq->map_dne_bound,
	     greq->u.newest);
	if (!lreq->map_dne_bound)
		lreq->map_dne_bound = greq->u.newest;
	erase_linger_mc(&osdc->linger_map_checks, lreq);
	check_linger_pool_dne(lreq);

	linger_put(lreq);
out_unlock:
	up_write(&osdc->lock);
}

static void send_linger_map_check(struct ceph_osd_linger_request *lreq)
{
	struct ceph_osd_client *osdc = lreq->osdc;
	struct ceph_osd_linger_request *lookup_lreq;
	int ret;

	verify_osdc_wrlocked(osdc);

	lookup_lreq = lookup_linger_mc(&osdc->linger_map_checks,
				       lreq->linger_id);
	if (lookup_lreq) {
		WARN_ON(lookup_lreq != lreq);
		return;
	}

	linger_get(lreq);
	insert_linger_mc(&osdc->linger_map_checks, lreq);
	ret = ceph_monc_get_version_async(&osdc->client->monc, "osdmap",
					  linger_map_check_cb, lreq->linger_id);
	WARN_ON(ret);
}

2701 2702 2703 2704 2705 2706 2707 2708 2709
static int linger_reg_commit_wait(struct ceph_osd_linger_request *lreq)
{
	int ret;

	dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
	ret = wait_for_completion_interruptible(&lreq->reg_commit_wait);
	return ret ?: lreq->reg_commit_error;
}

2710 2711 2712 2713 2714 2715 2716 2717 2718
static int linger_notify_finish_wait(struct ceph_osd_linger_request *lreq)
{
	int ret;

	dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
	ret = wait_for_completion_interruptible(&lreq->notify_finish_wait);
	return ret ?: lreq->notify_finish_error;
}

S
Sage Weil 已提交
2719
/*
2720 2721 2722 2723
 * Timeout callback, called every N seconds.  When 1 or more OSD
 * requests has been active for more than N seconds, we send a keepalive
 * (tag + timestamp) to its OSD to ensure any communications channel
 * reset is detected.
S
Sage Weil 已提交
2724 2725 2726 2727 2728
 */
static void handle_timeout(struct work_struct *work)
{
	struct ceph_osd_client *osdc =
		container_of(work, struct ceph_osd_client, timeout_work.work);
2729
	struct ceph_options *opts = osdc->client->options;
2730
	unsigned long cutoff = jiffies - opts->osd_keepalive_timeout;
2731
	unsigned long expiry_cutoff = jiffies - opts->osd_request_timeout;
2732 2733
	LIST_HEAD(slow_osds);
	struct rb_node *n, *p;
S
Sage Weil 已提交
2734

2735 2736
	dout("%s osdc %p\n", __func__, osdc);
	down_write(&osdc->lock);
S
Sage Weil 已提交
2737

2738 2739 2740 2741 2742
	/*
	 * 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).
	 */
2743 2744 2745 2746
	for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
		struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
		bool found = false;

2747
		for (p = rb_first(&osd->o_requests); p; ) {
2748 2749 2750
			struct ceph_osd_request *req =
			    rb_entry(p, struct ceph_osd_request, r_node);

2751 2752
			p = rb_next(p); /* abort_request() */

2753 2754 2755 2756 2757
			if (time_before(req->r_stamp, cutoff)) {
				dout(" req %p tid %llu on osd%d is laggy\n",
				     req, req->r_tid, osd->o_osd);
				found = true;
			}
2758 2759 2760 2761 2762 2763
			if (opts->osd_request_timeout &&
			    time_before(req->r_start_stamp, expiry_cutoff)) {
				pr_err_ratelimited("tid %llu on osd%d timeout\n",
				       req->r_tid, osd->o_osd);
				abort_request(req, -ETIMEDOUT);
			}
2764
		}
2765 2766 2767 2768 2769 2770 2771 2772 2773
		for (p = rb_first(&osd->o_linger_requests); p; p = rb_next(p)) {
			struct ceph_osd_linger_request *lreq =
			    rb_entry(p, struct ceph_osd_linger_request, node);

			dout(" lreq %p linger_id %llu is served by osd%d\n",
			     lreq, lreq->linger_id, osd->o_osd);
			found = true;

			mutex_lock(&lreq->lock);
2774
			if (lreq->is_watch && lreq->committed && !lreq->last_error)
2775 2776 2777
				send_linger_ping(lreq);
			mutex_unlock(&lreq->lock);
		}
2778

2779 2780
		if (found)
			list_move_tail(&osd->o_keepalive_item, &slow_osds);
2781
	}
2782

2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797
	if (opts->osd_request_timeout) {
		for (p = rb_first(&osdc->homeless_osd.o_requests); p; ) {
			struct ceph_osd_request *req =
			    rb_entry(p, struct ceph_osd_request, r_node);

			p = rb_next(p); /* abort_request() */

			if (time_before(req->r_start_stamp, expiry_cutoff)) {
				pr_err_ratelimited("tid %llu on osd%d timeout\n",
				       req->r_tid, osdc->homeless_osd.o_osd);
				abort_request(req, -ETIMEDOUT);
			}
		}
	}

2798 2799 2800
	if (atomic_read(&osdc->num_homeless) || !list_empty(&slow_osds))
		maybe_request_map(osdc);

2801
	while (!list_empty(&slow_osds)) {
2802 2803 2804
		struct ceph_osd *osd = list_first_entry(&slow_osds,
							struct ceph_osd,
							o_keepalive_item);
2805
		list_del_init(&osd->o_keepalive_item);
S
Sage Weil 已提交
2806 2807 2808
		ceph_con_keepalive(&osd->o_con);
	}

2809
	up_write(&osdc->lock);
2810 2811
	schedule_delayed_work(&osdc->timeout_work,
			      osdc->client->options->osd_keepalive_timeout);
S
Sage Weil 已提交
2812 2813
}

2814 2815 2816 2817 2818
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);
2819
	unsigned long delay = osdc->client->options->osd_idle_ttl / 4;
2820
	struct ceph_osd *osd, *nosd;
2821

2822
	dout("%s osdc %p\n", __func__, osdc);
2823
	down_write(&osdc->lock);
2824 2825 2826 2827
	list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
		if (time_before(jiffies, osd->lru_ttl))
			break;

2828
		WARN_ON(!RB_EMPTY_ROOT(&osd->o_requests));
2829
		WARN_ON(!RB_EMPTY_ROOT(&osd->o_linger_requests));
2830
		close_osd(osd);
2831
	}
2832

2833
	up_write(&osdc->lock);
2834 2835 2836 2837
	schedule_delayed_work(&osdc->osds_timeout_work,
			      round_jiffies_relative(delay));
}

2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872
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) {
2873 2874
		bool changed = false;

2875 2876
		len = ceph_decode_32(p);
		if (len > 0) {
2877
			ceph_decode_need(p, end, len, e_inval);
2878 2879 2880
			if (!oloc->pool_ns ||
			    ceph_compare_string(oloc->pool_ns, *p, len))
				changed = true;
2881
			*p += len;
2882 2883 2884 2885 2886 2887 2888 2889
		} else {
			if (oloc->pool_ns)
				changed = true;
		}
		if (changed) {
			/* redirect changes namespace */
			pr_warn("ceph_object_locator::nspace is changed\n");
			goto e_inval;
2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953
		}
	}

	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;
}

2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966
struct MOSDOpReply {
	struct ceph_pg pgid;
	u64 flags;
	int result;
	u32 epoch;
	int num_ops;
	u32 outdata_len[CEPH_OSD_MAX_OPS];
	s32 rval[CEPH_OSD_MAX_OPS];
	int retry_attempt;
	struct ceph_eversion replay_version;
	u64 user_version;
	struct ceph_request_redirect redirect;
};
S
Sage Weil 已提交
2967

2968
static int decode_MOSDOpReply(const struct ceph_msg *msg, struct MOSDOpReply *m)
S
Sage Weil 已提交
2969
{
2970 2971 2972 2973
	void *p = msg->front.iov_base;
	void *const end = p + msg->front.iov_len;
	u16 version = le16_to_cpu(msg->hdr.version);
	struct ceph_eversion bad_replay_version;
I
Ilya Dryomov 已提交
2974
	u8 decode_redir;
2975 2976 2977
	u32 len;
	int ret;
	int i;
2978

2979 2980 2981
	ceph_decode_32_safe(&p, end, len, e_inval);
	ceph_decode_need(&p, end, len, e_inval);
	p += len; /* skip oid */
2982

2983 2984 2985
	ret = ceph_decode_pgid(&p, end, &m->pgid);
	if (ret)
		return ret;
2986

2987 2988 2989 2990 2991 2992
	ceph_decode_64_safe(&p, end, m->flags, e_inval);
	ceph_decode_32_safe(&p, end, m->result, e_inval);
	ceph_decode_need(&p, end, sizeof(bad_replay_version), e_inval);
	memcpy(&bad_replay_version, p, sizeof(bad_replay_version));
	p += sizeof(bad_replay_version);
	ceph_decode_32_safe(&p, end, m->epoch, e_inval);
2993

2994 2995 2996
	ceph_decode_32_safe(&p, end, m->num_ops, e_inval);
	if (m->num_ops > ARRAY_SIZE(m->outdata_len))
		goto e_inval;
2997

2998 2999 3000
	ceph_decode_need(&p, end, m->num_ops * sizeof(struct ceph_osd_op),
			 e_inval);
	for (i = 0; i < m->num_ops; i++) {
3001 3002
		struct ceph_osd_op *op = p;

3003
		m->outdata_len[i] = le32_to_cpu(op->payload_len);
3004 3005 3006
		p += sizeof(*op);
	}

3007 3008 3009
	ceph_decode_32_safe(&p, end, m->retry_attempt, e_inval);
	for (i = 0; i < m->num_ops; i++)
		ceph_decode_32_safe(&p, end, m->rval[i], e_inval);
S
Sage Weil 已提交
3010

3011 3012 3013 3014 3015 3016 3017 3018 3019
	if (version >= 5) {
		ceph_decode_need(&p, end, sizeof(m->replay_version), e_inval);
		memcpy(&m->replay_version, p, sizeof(m->replay_version));
		p += sizeof(m->replay_version);
		ceph_decode_64_safe(&p, end, m->user_version, e_inval);
	} else {
		m->replay_version = bad_replay_version; /* struct */
		m->user_version = le64_to_cpu(m->replay_version.version);
	}
Y
Yan, Zheng 已提交
3020

3021 3022 3023
	if (version >= 6) {
		if (version >= 7)
			ceph_decode_8_safe(&p, end, decode_redir, e_inval);
I
Ilya Dryomov 已提交
3024 3025 3026 3027 3028 3029 3030
		else
			decode_redir = 1;
	} else {
		decode_redir = 0;
	}

	if (decode_redir) {
3031 3032 3033
		ret = ceph_redirect_decode(&p, end, &m->redirect);
		if (ret)
			return ret;
3034
	} else {
3035
		ceph_oloc_init(&m->redirect.oloc);
3036
	}
S
Sage Weil 已提交
3037

3038 3039 3040 3041 3042 3043 3044
	return 0;

e_inval:
	return -EINVAL;
}

/*
I
Ilya Dryomov 已提交
3045 3046
 * Handle MOSDOpReply.  Set ->r_result and call the callback if it is
 * specified.
3047
 */
3048
static void handle_reply(struct ceph_osd *osd, struct ceph_msg *msg)
3049
{
3050
	struct ceph_osd_client *osdc = osd->o_osdc;
3051 3052 3053 3054 3055 3056 3057 3058 3059
	struct ceph_osd_request *req;
	struct MOSDOpReply m;
	u64 tid = le64_to_cpu(msg->hdr.tid);
	u32 data_len = 0;
	int ret;
	int i;

	dout("%s msg %p tid %llu\n", __func__, msg, tid);

3060 3061 3062 3063 3064 3065 3066 3067 3068
	down_read(&osdc->lock);
	if (!osd_registered(osd)) {
		dout("%s osd%d unknown\n", __func__, osd->o_osd);
		goto out_unlock_osdc;
	}
	WARN_ON(osd->o_osd != le64_to_cpu(msg->hdr.src.num));

	mutex_lock(&osd->lock);
	req = lookup_request(&osd->o_requests, tid);
3069
	if (!req) {
3070 3071
		dout("%s osd%d tid %llu unknown\n", __func__, osd->o_osd, tid);
		goto out_unlock_session;
3072 3073
	}

3074
	m.redirect.oloc.pool_ns = req->r_t.target_oloc.pool_ns;
3075
	ret = decode_MOSDOpReply(msg, &m);
3076
	m.redirect.oloc.pool_ns = NULL;
3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092
	if (ret) {
		pr_err("failed to decode MOSDOpReply for tid %llu: %d\n",
		       req->r_tid, ret);
		ceph_msg_dump(msg);
		goto fail_request;
	}
	dout("%s req %p tid %llu flags 0x%llx pgid %llu.%x epoch %u attempt %d v %u'%llu uv %llu\n",
	     __func__, req, req->r_tid, m.flags, m.pgid.pool, m.pgid.seed,
	     m.epoch, m.retry_attempt, le32_to_cpu(m.replay_version.epoch),
	     le64_to_cpu(m.replay_version.version), m.user_version);

	if (m.retry_attempt >= 0) {
		if (m.retry_attempt != req->r_attempts - 1) {
			dout("req %p tid %llu retry_attempt %d != %d, ignoring\n",
			     req, req->r_tid, m.retry_attempt,
			     req->r_attempts - 1);
3093
			goto out_unlock_session;
3094 3095 3096 3097 3098 3099 3100 3101
		}
	} else {
		WARN_ON(1); /* MOSDOpReply v4 is assumed */
	}

	if (!ceph_oloc_empty(&m.redirect.oloc)) {
		dout("req %p tid %llu redirect pool %lld\n", req, req->r_tid,
		     m.redirect.oloc.pool);
3102 3103
		unlink_request(osd, req);
		mutex_unlock(&osd->lock);
3104

3105 3106 3107 3108 3109
		/*
		 * Not ceph_oloc_copy() - changing pool_ns is not
		 * supported.
		 */
		req->r_t.target_oloc.pool = m.redirect.oloc.pool;
3110 3111 3112 3113
		req->r_flags |= CEPH_OSD_FLAG_REDIRECTED;
		req->r_tid = 0;
		__submit_request(req, false);
		goto out_unlock_osdc;
3114 3115
	}

3116 3117 3118 3119
	if (m.num_ops != req->r_num_ops) {
		pr_err("num_ops %d != %d for tid %llu\n", m.num_ops,
		       req->r_num_ops, req->r_tid);
		goto fail_request;
S
Sage Weil 已提交
3120
	}
3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132
	for (i = 0; i < req->r_num_ops; i++) {
		dout(" req %p tid %llu op %d rval %d len %u\n", req,
		     req->r_tid, i, m.rval[i], m.outdata_len[i]);
		req->r_ops[i].rval = m.rval[i];
		req->r_ops[i].outdata_len = m.outdata_len[i];
		data_len += m.outdata_len[i];
	}
	if (data_len != le32_to_cpu(msg->hdr.data_len)) {
		pr_err("sum of lens %u != %u for tid %llu\n", data_len,
		       le32_to_cpu(msg->hdr.data_len), req->r_tid);
		goto fail_request;
	}
I
Ilya Dryomov 已提交
3133 3134
	dout("%s req %p tid %llu result %d data_len %u\n", __func__,
	     req, req->r_tid, m.result, data_len);
S
Sage Weil 已提交
3135

I
Ilya Dryomov 已提交
3136 3137 3138 3139 3140 3141 3142
	/*
	 * Since we only ever request ONDISK, we should only ever get
	 * one (type of) reply back.
	 */
	WARN_ON(!(m.flags & CEPH_OSD_FLAG_ONDISK));
	req->r_result = m.result ?: data_len;
	finish_request(req);
3143 3144
	mutex_unlock(&osd->lock);
	up_read(&osdc->lock);
S
Sage Weil 已提交
3145

I
Ilya Dryomov 已提交
3146 3147 3148
	__complete_request(req);
	complete_all(&req->r_completion);
	ceph_osdc_put_request(req);
S
Sage Weil 已提交
3149 3150
	return;

3151
fail_request:
I
Ilya Dryomov 已提交
3152
	complete_request(req, -EIO);
3153 3154 3155 3156
out_unlock_session:
	mutex_unlock(&osd->lock);
out_unlock_osdc:
	up_read(&osdc->lock);
S
Sage Weil 已提交
3157 3158
}

I
Ilya Dryomov 已提交
3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170
static void set_pool_was_full(struct ceph_osd_client *osdc)
{
	struct rb_node *n;

	for (n = rb_first(&osdc->osdmap->pg_pools); n; n = rb_next(n)) {
		struct ceph_pg_pool_info *pi =
		    rb_entry(n, struct ceph_pg_pool_info, node);

		pi->was_full = __pool_full(pi);
	}
}

3171
static bool pool_cleared_full(struct ceph_osd_client *osdc, s64 pool_id)
S
Sage Weil 已提交
3172
{
3173
	struct ceph_pg_pool_info *pi;
S
Sage Weil 已提交
3174

3175 3176 3177
	pi = ceph_pg_pool_by_id(osdc->osdmap, pool_id);
	if (!pi)
		return false;
S
Sage Weil 已提交
3178

3179
	return pi->was_full && !__pool_full(pi);
3180 3181
}

3182 3183 3184 3185 3186 3187
static enum calc_target_result
recalc_linger_target(struct ceph_osd_linger_request *lreq)
{
	struct ceph_osd_client *osdc = lreq->osdc;
	enum calc_target_result ct_res;

3188
	ct_res = calc_target(osdc, &lreq->t, NULL, true);
3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201
	if (ct_res == CALC_TARGET_NEED_RESEND) {
		struct ceph_osd *osd;

		osd = lookup_create_osd(osdc, lreq->t.osd, true);
		if (osd != lreq->osd) {
			unlink_linger(lreq->osd, lreq);
			link_linger(osd, lreq);
		}
	}

	return ct_res;
}

3202
/*
3203
 * Requeue requests whose mapping to an OSD has changed.
3204
 */
3205 3206 3207 3208 3209 3210
static void scan_requests(struct ceph_osd *osd,
			  bool force_resend,
			  bool cleared_full,
			  bool check_pool_cleared_full,
			  struct rb_root *need_resend,
			  struct list_head *need_resend_linger)
3211
{
3212 3213 3214 3215
	struct ceph_osd_client *osdc = osd->o_osdc;
	struct rb_node *n;
	bool force_resend_writes;

3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235
	for (n = rb_first(&osd->o_linger_requests); n; ) {
		struct ceph_osd_linger_request *lreq =
		    rb_entry(n, struct ceph_osd_linger_request, node);
		enum calc_target_result ct_res;

		n = rb_next(n); /* recalc_linger_target() */

		dout("%s lreq %p linger_id %llu\n", __func__, lreq,
		     lreq->linger_id);
		ct_res = recalc_linger_target(lreq);
		switch (ct_res) {
		case CALC_TARGET_NO_ACTION:
			force_resend_writes = cleared_full ||
			    (check_pool_cleared_full &&
			     pool_cleared_full(osdc, lreq->t.base_oloc.pool));
			if (!force_resend && !force_resend_writes)
				break;

			/* fall through */
		case CALC_TARGET_NEED_RESEND:
I
Ilya Dryomov 已提交
3236
			cancel_linger_map_check(lreq);
3237 3238 3239 3240 3241 3242 3243 3244 3245
			/*
			 * scan_requests() for the previous epoch(s)
			 * may have already added it to the list, since
			 * it's not unlinked here.
			 */
			if (list_empty(&lreq->scan_item))
				list_add_tail(&lreq->scan_item, need_resend_linger);
			break;
		case CALC_TARGET_POOL_DNE:
I
Ilya Dryomov 已提交
3246
			check_linger_pool_dne(lreq);
3247 3248 3249 3250
			break;
		}
	}

3251 3252 3253 3254 3255
	for (n = rb_first(&osd->o_requests); n; ) {
		struct ceph_osd_request *req =
		    rb_entry(n, struct ceph_osd_request, r_node);
		enum calc_target_result ct_res;

I
Ilya Dryomov 已提交
3256
		n = rb_next(n); /* unlink_request(), check_pool_dne() */
3257 3258

		dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
3259 3260
		ct_res = calc_target(osdc, &req->r_t, &req->r_osd->o_con,
				     false);
3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272
		switch (ct_res) {
		case CALC_TARGET_NO_ACTION:
			force_resend_writes = cleared_full ||
			    (check_pool_cleared_full &&
			     pool_cleared_full(osdc, req->r_t.base_oloc.pool));
			if (!force_resend &&
			    (!(req->r_flags & CEPH_OSD_FLAG_WRITE) ||
			     !force_resend_writes))
				break;

			/* fall through */
		case CALC_TARGET_NEED_RESEND:
I
Ilya Dryomov 已提交
3273
			cancel_map_check(req);
3274 3275 3276 3277
			unlink_request(osd, req);
			insert_request(need_resend, req);
			break;
		case CALC_TARGET_POOL_DNE:
I
Ilya Dryomov 已提交
3278
			check_pool_dne(req);
3279
			break;
3280
		}
3281
	}
3282
}
3283

I
Ilya Dryomov 已提交
3284
static int handle_one_map(struct ceph_osd_client *osdc,
3285 3286 3287
			  void *p, void *end, bool incremental,
			  struct rb_root *need_resend,
			  struct list_head *need_resend_linger)
I
Ilya Dryomov 已提交
3288 3289 3290 3291 3292 3293
{
	struct ceph_osdmap *newmap;
	struct rb_node *n;
	bool skipped_map = false;
	bool was_full;

3294
	was_full = ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL);
I
Ilya Dryomov 已提交
3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331
	set_pool_was_full(osdc);

	if (incremental)
		newmap = osdmap_apply_incremental(&p, end, osdc->osdmap);
	else
		newmap = ceph_osdmap_decode(&p, end);
	if (IS_ERR(newmap))
		return PTR_ERR(newmap);

	if (newmap != osdc->osdmap) {
		/*
		 * Preserve ->was_full before destroying the old map.
		 * For pools that weren't in the old map, ->was_full
		 * should be false.
		 */
		for (n = rb_first(&newmap->pg_pools); n; n = rb_next(n)) {
			struct ceph_pg_pool_info *pi =
			    rb_entry(n, struct ceph_pg_pool_info, node);
			struct ceph_pg_pool_info *old_pi;

			old_pi = ceph_pg_pool_by_id(osdc->osdmap, pi->id);
			if (old_pi)
				pi->was_full = old_pi->was_full;
			else
				WARN_ON(pi->was_full);
		}

		if (osdc->osdmap->epoch &&
		    osdc->osdmap->epoch + 1 < newmap->epoch) {
			WARN_ON(incremental);
			skipped_map = true;
		}

		ceph_osdmap_destroy(osdc->osdmap);
		osdc->osdmap = newmap;
	}

3332
	was_full &= !ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL);
3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348
	scan_requests(&osdc->homeless_osd, skipped_map, was_full, true,
		      need_resend, need_resend_linger);

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

		n = rb_next(n); /* close_osd() */

		scan_requests(osd, skipped_map, was_full, true, need_resend,
			      need_resend_linger);
		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)))
			close_osd(osd);
	}
I
Ilya Dryomov 已提交
3349 3350 3351

	return 0;
}
3352

3353 3354 3355 3356
static void kick_requests(struct ceph_osd_client *osdc,
			  struct rb_root *need_resend,
			  struct list_head *need_resend_linger)
{
3357
	struct ceph_osd_linger_request *lreq, *nlreq;
3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368
	struct rb_node *n;

	for (n = rb_first(need_resend); n; ) {
		struct ceph_osd_request *req =
		    rb_entry(n, struct ceph_osd_request, r_node);
		struct ceph_osd *osd;

		n = rb_next(n);
		erase_request(need_resend, req); /* before link_request() */

		WARN_ON(req->r_osd);
3369
		calc_target(osdc, &req->r_t, NULL, false);
3370 3371 3372 3373 3374
		osd = lookup_create_osd(osdc, req->r_t.osd, true);
		link_request(osd, req);
		if (!req->r_linger) {
			if (!osd_homeless(osd) && !req->r_t.paused)
				send_request(req);
3375 3376
		} else {
			cancel_linger_request(req);
3377 3378
		}
	}
3379 3380 3381 3382 3383 3384 3385

	list_for_each_entry_safe(lreq, nlreq, need_resend_linger, scan_item) {
		if (!osd_homeless(lreq->osd))
			send_linger(lreq);

		list_del_init(&lreq->scan_item);
	}
3386 3387
}

S
Sage Weil 已提交
3388 3389 3390 3391 3392 3393 3394 3395 3396
/*
 * 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)
{
I
Ilya Dryomov 已提交
3397 3398
	void *p = msg->front.iov_base;
	void *const end = p + msg->front.iov_len;
S
Sage Weil 已提交
3399 3400 3401
	u32 nr_maps, maplen;
	u32 epoch;
	struct ceph_fsid fsid;
3402 3403
	struct rb_root need_resend = RB_ROOT;
	LIST_HEAD(need_resend_linger);
I
Ilya Dryomov 已提交
3404 3405 3406 3407
	bool handled_incremental = false;
	bool was_pauserd, was_pausewr;
	bool pauserd, pausewr;
	int err;
S
Sage Weil 已提交
3408

I
Ilya Dryomov 已提交
3409
	dout("%s have %u\n", __func__, osdc->osdmap->epoch);
3410
	down_write(&osdc->lock);
S
Sage Weil 已提交
3411 3412 3413 3414

	/* verify fsid */
	ceph_decode_need(&p, end, sizeof(fsid), bad);
	ceph_decode_copy(&p, &fsid, sizeof(fsid));
3415
	if (ceph_check_fsid(osdc->client, &fsid) < 0)
I
Ilya Dryomov 已提交
3416
		goto bad;
S
Sage Weil 已提交
3417

3418 3419 3420
	was_pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
	was_pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
		      ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
I
Ilya Dryomov 已提交
3421
		      have_pool_full(osdc);
3422

S
Sage Weil 已提交
3423 3424 3425 3426 3427
	/* 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);
3428 3429
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
Sage Weil 已提交
3430
		ceph_decode_need(&p, end, maplen, bad);
I
Ilya Dryomov 已提交
3431 3432
		if (osdc->osdmap->epoch &&
		    osdc->osdmap->epoch + 1 == epoch) {
S
Sage Weil 已提交
3433 3434
			dout("applying incremental map %u len %d\n",
			     epoch, maplen);
3435 3436
			err = handle_one_map(osdc, p, p + maplen, true,
					     &need_resend, &need_resend_linger);
I
Ilya Dryomov 已提交
3437
			if (err)
S
Sage Weil 已提交
3438
				goto bad;
I
Ilya Dryomov 已提交
3439
			handled_incremental = true;
S
Sage Weil 已提交
3440 3441 3442 3443
		} else {
			dout("ignoring incremental map %u len %d\n",
			     epoch, maplen);
		}
I
Ilya Dryomov 已提交
3444
		p += maplen;
S
Sage Weil 已提交
3445 3446
		nr_maps--;
	}
I
Ilya Dryomov 已提交
3447
	if (handled_incremental)
S
Sage Weil 已提交
3448 3449 3450 3451 3452 3453 3454
		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);
3455 3456
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
Sage Weil 已提交
3457 3458 3459 3460
		ceph_decode_need(&p, end, maplen, bad);
		if (nr_maps > 1) {
			dout("skipping non-latest full map %u len %d\n",
			     epoch, maplen);
3461
		} else if (osdc->osdmap->epoch >= epoch) {
S
Sage Weil 已提交
3462 3463 3464 3465 3466
			dout("skipping full map %u len %d, "
			     "older than our %u\n", epoch, maplen,
			     osdc->osdmap->epoch);
		} else {
			dout("taking full map %u len %d\n", epoch, maplen);
3467 3468
			err = handle_one_map(osdc, p, p + maplen, false,
					     &need_resend, &need_resend_linger);
I
Ilya Dryomov 已提交
3469
			if (err)
S
Sage Weil 已提交
3470 3471 3472 3473 3474 3475 3476
				goto bad;
		}
		p += maplen;
		nr_maps--;
	}

done:
3477 3478 3479 3480 3481
	/*
	 * subscribe to subsequent osdmap updates if full to ensure
	 * we find out when we are no longer full and stop returning
	 * ENOSPC.
	 */
3482 3483 3484
	pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
	pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
		  ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
I
Ilya Dryomov 已提交
3485
		  have_pool_full(osdc);
3486 3487
	if (was_pauserd || was_pausewr || pauserd || pausewr ||
	    osdc->osdmap->epoch < osdc->epoch_barrier)
I
Ilya Dryomov 已提交
3488
		maybe_request_map(osdc);
3489

3490
	kick_requests(osdc, &need_resend, &need_resend_linger);
I
Ilya Dryomov 已提交
3491

3492
	ceph_osdc_abort_on_full(osdc);
I
Ilya Dryomov 已提交
3493 3494
	ceph_monc_got_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
			  osdc->osdmap->epoch);
3495
	up_write(&osdc->lock);
3496
	wake_up_all(&osdc->client->auth_wq);
S
Sage Weil 已提交
3497 3498 3499 3500
	return;

bad:
	pr_err("osdc handle_map corrupt msg\n");
3501
	ceph_msg_dump(msg);
3502 3503 3504 3505 3506 3507 3508 3509 3510 3511
	up_write(&osdc->lock);
}

/*
 * Resubmit requests pending on the given osd.
 */
static void kick_osd_requests(struct ceph_osd *osd)
{
	struct rb_node *n;

3512
	for (n = rb_first(&osd->o_requests); n; ) {
3513 3514 3515
		struct ceph_osd_request *req =
		    rb_entry(n, struct ceph_osd_request, r_node);

3516 3517
		n = rb_next(n); /* cancel_linger_request() */

3518 3519 3520
		if (!req->r_linger) {
			if (!req->r_t.paused)
				send_request(req);
3521 3522
		} else {
			cancel_linger_request(req);
3523 3524
		}
	}
3525 3526 3527 3528 3529 3530
	for (n = rb_first(&osd->o_linger_requests); n; n = rb_next(n)) {
		struct ceph_osd_linger_request *lreq =
		    rb_entry(n, struct ceph_osd_linger_request, node);

		send_linger(lreq);
	}
3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554
}

/*
 * If the osd connection drops, we need to resubmit all requests.
 */
static void osd_fault(struct ceph_connection *con)
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc = osd->o_osdc;

	dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);

	down_write(&osdc->lock);
	if (!osd_registered(osd)) {
		dout("%s osd%d unknown\n", __func__, osd->o_osd);
		goto out_unlock;
	}

	if (!reopen_osd(osd))
		kick_osd_requests(osd);
	maybe_request_map(osdc);

out_unlock:
	up_write(&osdc->lock);
S
Sage Weil 已提交
3555 3556
}

3557 3558 3559
/*
 * Process osd watch notifications
 */
3560 3561
static void handle_watch_notify(struct ceph_osd_client *osdc,
				struct ceph_msg *msg)
3562
{
3563 3564 3565 3566 3567 3568 3569
	void *p = msg->front.iov_base;
	void *const end = p + msg->front.iov_len;
	struct ceph_osd_linger_request *lreq;
	struct linger_work *lwork;
	u8 proto_ver, opcode;
	u64 cookie, notify_id;
	u64 notifier_id = 0;
3570
	s32 return_code = 0;
3571 3572
	void *payload = NULL;
	u32 payload_len = 0;
3573 3574 3575 3576

	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);
3577
	p += 8; /* skip ver */
3578 3579
	ceph_decode_64_safe(&p, end, notify_id, bad);

3580 3581 3582 3583 3584 3585 3586 3587
	if (proto_ver >= 1) {
		ceph_decode_32_safe(&p, end, payload_len, bad);
		ceph_decode_need(&p, end, payload_len, bad);
		payload = p;
		p += payload_len;
	}

	if (le16_to_cpu(msg->hdr.version) >= 2)
3588
		ceph_decode_32_safe(&p, end, return_code, bad);
3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601

	if (le16_to_cpu(msg->hdr.version) >= 3)
		ceph_decode_64_safe(&p, end, notifier_id, bad);

	down_read(&osdc->lock);
	lreq = lookup_linger_osdc(&osdc->linger_requests, cookie);
	if (!lreq) {
		dout("%s opcode %d cookie %llu dne\n", __func__, opcode,
		     cookie);
		goto out_unlock_osdc;
	}

	mutex_lock(&lreq->lock);
3602 3603
	dout("%s opcode %d cookie %llu lreq %p is_watch %d\n", __func__,
	     opcode, cookie, lreq, lreq->is_watch);
3604 3605 3606 3607 3608
	if (opcode == CEPH_WATCH_EVENT_DISCONNECT) {
		if (!lreq->last_error) {
			lreq->last_error = -ENOTCONN;
			queue_watch_error(lreq);
		}
3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633
	} else if (!lreq->is_watch) {
		/* CEPH_WATCH_EVENT_NOTIFY_COMPLETE */
		if (lreq->notify_id && lreq->notify_id != notify_id) {
			dout("lreq %p notify_id %llu != %llu, ignoring\n", lreq,
			     lreq->notify_id, notify_id);
		} else if (!completion_done(&lreq->notify_finish_wait)) {
			struct ceph_msg_data *data =
			    list_first_entry_or_null(&msg->data,
						     struct ceph_msg_data,
						     links);

			if (data) {
				if (lreq->preply_pages) {
					WARN_ON(data->type !=
							CEPH_MSG_DATA_PAGES);
					*lreq->preply_pages = data->pages;
					*lreq->preply_len = data->length;
				} else {
					ceph_release_page_vector(data->pages,
					       calc_pages_for(0, data->length));
				}
			}
			lreq->notify_finish_error = return_code;
			complete_all(&lreq->notify_finish_wait);
		}
3634 3635 3636 3637 3638 3639
	} else {
		/* CEPH_WATCH_EVENT_NOTIFY */
		lwork = lwork_alloc(lreq, do_watch_notify);
		if (!lwork) {
			pr_err("failed to allocate notify-lwork\n");
			goto out_unlock_lreq;
3640 3641
		}

3642 3643 3644 3645 3646 3647
		lwork->notify.notify_id = notify_id;
		lwork->notify.notifier_id = notifier_id;
		lwork->notify.payload = payload;
		lwork->notify.payload_len = payload_len;
		lwork->notify.msg = ceph_msg_get(msg);
		lwork_queue(lwork);
3648
	}
3649

3650 3651 3652 3653
out_unlock_lreq:
	mutex_unlock(&lreq->lock);
out_unlock_osdc:
	up_read(&osdc->lock);
3654 3655 3656 3657 3658 3659
	return;

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

3660 3661 3662 3663 3664 3665 3666
/*
 * Register request, send initial attempt.
 */
int ceph_osdc_start_request(struct ceph_osd_client *osdc,
			    struct ceph_osd_request *req,
			    bool nofail)
{
3667 3668 3669
	down_read(&osdc->lock);
	submit_request(req, false);
	up_read(&osdc->lock);
3670

3671
	return 0;
S
Sage Weil 已提交
3672
}
3673
EXPORT_SYMBOL(ceph_osdc_start_request);
S
Sage Weil 已提交
3674

3675
/*
3676 3677
 * Unregister a registered request.  The request is not completed:
 * ->r_result isn't set and __complete_request() isn't called.
3678 3679 3680 3681 3682
 */
void ceph_osdc_cancel_request(struct ceph_osd_request *req)
{
	struct ceph_osd_client *osdc = req->r_osdc;

3683 3684 3685 3686
	down_write(&osdc->lock);
	if (req->r_osd)
		cancel_request(req);
	up_write(&osdc->lock);
3687 3688 3689
}
EXPORT_SYMBOL(ceph_osdc_cancel_request);

S
Sage Weil 已提交
3690
/*
I
Ilya Dryomov 已提交
3691
 * @timeout: in jiffies, 0 means "wait forever"
S
Sage Weil 已提交
3692
 */
I
Ilya Dryomov 已提交
3693 3694
static int wait_request_timeout(struct ceph_osd_request *req,
				unsigned long timeout)
S
Sage Weil 已提交
3695
{
I
Ilya Dryomov 已提交
3696
	long left;
3697

I
Ilya Dryomov 已提交
3698
	dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
3699
	left = wait_for_completion_killable_timeout(&req->r_completion,
I
Ilya Dryomov 已提交
3700 3701 3702
						ceph_timeout_jiffies(timeout));
	if (left <= 0) {
		left = left ?: -ETIMEDOUT;
3703
		ceph_osdc_cancel_request(req);
I
Ilya Dryomov 已提交
3704 3705
	} else {
		left = req->r_result; /* completed */
S
Sage Weil 已提交
3706 3707
	}

I
Ilya Dryomov 已提交
3708 3709 3710 3711 3712 3713 3714 3715 3716 3717
	return left;
}

/*
 * wait for a request to complete
 */
int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req)
{
	return wait_request_timeout(req, 0);
S
Sage Weil 已提交
3718
}
3719
EXPORT_SYMBOL(ceph_osdc_wait_request);
S
Sage Weil 已提交
3720 3721 3722 3723 3724 3725

/*
 * sync - wait for all in-flight requests to flush.  avoid starvation.
 */
void ceph_osdc_sync(struct ceph_osd_client *osdc)
{
3726 3727
	struct rb_node *n, *p;
	u64 last_tid = atomic64_read(&osdc->last_tid);
S
Sage Weil 已提交
3728

3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743
again:
	down_read(&osdc->lock);
	for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
		struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);

		mutex_lock(&osd->lock);
		for (p = rb_first(&osd->o_requests); p; p = rb_next(p)) {
			struct ceph_osd_request *req =
			    rb_entry(p, struct ceph_osd_request, r_node);

			if (req->r_tid > last_tid)
				break;

			if (!(req->r_flags & CEPH_OSD_FLAG_WRITE))
				continue;
S
Sage Weil 已提交
3744

3745 3746 3747 3748 3749
			ceph_osdc_get_request(req);
			mutex_unlock(&osd->lock);
			up_read(&osdc->lock);
			dout("%s waiting on req %p tid %llu last_tid %llu\n",
			     __func__, req, req->r_tid, last_tid);
I
Ilya Dryomov 已提交
3750
			wait_for_completion(&req->r_completion);
3751 3752 3753
			ceph_osdc_put_request(req);
			goto again;
		}
S
Sage Weil 已提交
3754

3755
		mutex_unlock(&osd->lock);
S
Sage Weil 已提交
3756
	}
3757 3758 3759

	up_read(&osdc->lock);
	dout("%s done last_tid %llu\n", __func__, last_tid);
S
Sage Weil 已提交
3760
}
3761
EXPORT_SYMBOL(ceph_osdc_sync);
S
Sage Weil 已提交
3762

3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800
static struct ceph_osd_request *
alloc_linger_request(struct ceph_osd_linger_request *lreq)
{
	struct ceph_osd_request *req;

	req = ceph_osdc_alloc_request(lreq->osdc, NULL, 1, false, GFP_NOIO);
	if (!req)
		return NULL;

	ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
	ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);

	if (ceph_osdc_alloc_messages(req, GFP_NOIO)) {
		ceph_osdc_put_request(req);
		return NULL;
	}

	return req;
}

/*
 * Returns a handle, caller owns a ref.
 */
struct ceph_osd_linger_request *
ceph_osdc_watch(struct ceph_osd_client *osdc,
		struct ceph_object_id *oid,
		struct ceph_object_locator *oloc,
		rados_watchcb2_t wcb,
		rados_watcherrcb_t errcb,
		void *data)
{
	struct ceph_osd_linger_request *lreq;
	int ret;

	lreq = linger_alloc(osdc);
	if (!lreq)
		return ERR_PTR(-ENOMEM);

3801
	lreq->is_watch = true;
3802 3803 3804
	lreq->wcb = wcb;
	lreq->errcb = errcb;
	lreq->data = data;
3805
	lreq->watch_valid_thru = jiffies;
3806 3807 3808

	ceph_oid_copy(&lreq->t.base_oid, oid);
	ceph_oloc_copy(&lreq->t.base_oloc, oloc);
3809
	lreq->t.flags = CEPH_OSD_FLAG_WRITE;
3810
	ktime_get_real_ts(&lreq->mtime);
3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866

	lreq->reg_req = alloc_linger_request(lreq);
	if (!lreq->reg_req) {
		ret = -ENOMEM;
		goto err_put_lreq;
	}

	lreq->ping_req = alloc_linger_request(lreq);
	if (!lreq->ping_req) {
		ret = -ENOMEM;
		goto err_put_lreq;
	}

	down_write(&osdc->lock);
	linger_register(lreq); /* before osd_req_op_* */
	osd_req_op_watch_init(lreq->reg_req, 0, lreq->linger_id,
			      CEPH_OSD_WATCH_OP_WATCH);
	osd_req_op_watch_init(lreq->ping_req, 0, lreq->linger_id,
			      CEPH_OSD_WATCH_OP_PING);
	linger_submit(lreq);
	up_write(&osdc->lock);

	ret = linger_reg_commit_wait(lreq);
	if (ret) {
		linger_cancel(lreq);
		goto err_put_lreq;
	}

	return lreq;

err_put_lreq:
	linger_put(lreq);
	return ERR_PTR(ret);
}
EXPORT_SYMBOL(ceph_osdc_watch);

/*
 * Releases a ref.
 *
 * Times out after mount_timeout to preserve rbd unmap behaviour
 * introduced in 2894e1d76974 ("rbd: timeout watch teardown on unmap
 * with mount_timeout").
 */
int ceph_osdc_unwatch(struct ceph_osd_client *osdc,
		      struct ceph_osd_linger_request *lreq)
{
	struct ceph_options *opts = osdc->client->options;
	struct ceph_osd_request *req;
	int ret;

	req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
	if (!req)
		return -ENOMEM;

	ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
	ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
3867
	req->r_flags = CEPH_OSD_FLAG_WRITE;
3868
	ktime_get_real_ts(&req->r_mtime);
3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956
	osd_req_op_watch_init(req, 0, lreq->linger_id,
			      CEPH_OSD_WATCH_OP_UNWATCH);

	ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
	if (ret)
		goto out_put_req;

	ceph_osdc_start_request(osdc, req, false);
	linger_cancel(lreq);
	linger_put(lreq);
	ret = wait_request_timeout(req, opts->mount_timeout);

out_put_req:
	ceph_osdc_put_request(req);
	return ret;
}
EXPORT_SYMBOL(ceph_osdc_unwatch);

static int osd_req_op_notify_ack_init(struct ceph_osd_request *req, int which,
				      u64 notify_id, u64 cookie, void *payload,
				      size_t payload_len)
{
	struct ceph_osd_req_op *op;
	struct ceph_pagelist *pl;
	int ret;

	op = _osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY_ACK, 0);

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

	ceph_pagelist_init(pl);
	ret = ceph_pagelist_encode_64(pl, notify_id);
	ret |= ceph_pagelist_encode_64(pl, cookie);
	if (payload) {
		ret |= ceph_pagelist_encode_32(pl, payload_len);
		ret |= ceph_pagelist_append(pl, payload, payload_len);
	} else {
		ret |= ceph_pagelist_encode_32(pl, 0);
	}
	if (ret) {
		ceph_pagelist_release(pl);
		return -ENOMEM;
	}

	ceph_osd_data_pagelist_init(&op->notify_ack.request_data, pl);
	op->indata_len = pl->length;
	return 0;
}

int ceph_osdc_notify_ack(struct ceph_osd_client *osdc,
			 struct ceph_object_id *oid,
			 struct ceph_object_locator *oloc,
			 u64 notify_id,
			 u64 cookie,
			 void *payload,
			 size_t payload_len)
{
	struct ceph_osd_request *req;
	int ret;

	req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
	if (!req)
		return -ENOMEM;

	ceph_oid_copy(&req->r_base_oid, oid);
	ceph_oloc_copy(&req->r_base_oloc, oloc);
	req->r_flags = CEPH_OSD_FLAG_READ;

	ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
	if (ret)
		goto out_put_req;

	ret = osd_req_op_notify_ack_init(req, 0, notify_id, cookie, payload,
					 payload_len);
	if (ret)
		goto out_put_req;

	ceph_osdc_start_request(osdc, req, false);
	ret = ceph_osdc_wait_request(osdc, req);

out_put_req:
	ceph_osdc_put_request(req);
	return ret;
}
EXPORT_SYMBOL(ceph_osdc_notify_ack);

3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066
static int osd_req_op_notify_init(struct ceph_osd_request *req, int which,
				  u64 cookie, u32 prot_ver, u32 timeout,
				  void *payload, size_t payload_len)
{
	struct ceph_osd_req_op *op;
	struct ceph_pagelist *pl;
	int ret;

	op = _osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY, 0);
	op->notify.cookie = cookie;

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

	ceph_pagelist_init(pl);
	ret = ceph_pagelist_encode_32(pl, 1); /* prot_ver */
	ret |= ceph_pagelist_encode_32(pl, timeout);
	ret |= ceph_pagelist_encode_32(pl, payload_len);
	ret |= ceph_pagelist_append(pl, payload, payload_len);
	if (ret) {
		ceph_pagelist_release(pl);
		return -ENOMEM;
	}

	ceph_osd_data_pagelist_init(&op->notify.request_data, pl);
	op->indata_len = pl->length;
	return 0;
}

/*
 * @timeout: in seconds
 *
 * @preply_{pages,len} are initialized both on success and error.
 * The caller is responsible for:
 *
 *     ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len))
 */
int ceph_osdc_notify(struct ceph_osd_client *osdc,
		     struct ceph_object_id *oid,
		     struct ceph_object_locator *oloc,
		     void *payload,
		     size_t payload_len,
		     u32 timeout,
		     struct page ***preply_pages,
		     size_t *preply_len)
{
	struct ceph_osd_linger_request *lreq;
	struct page **pages;
	int ret;

	WARN_ON(!timeout);
	if (preply_pages) {
		*preply_pages = NULL;
		*preply_len = 0;
	}

	lreq = linger_alloc(osdc);
	if (!lreq)
		return -ENOMEM;

	lreq->preply_pages = preply_pages;
	lreq->preply_len = preply_len;

	ceph_oid_copy(&lreq->t.base_oid, oid);
	ceph_oloc_copy(&lreq->t.base_oloc, oloc);
	lreq->t.flags = CEPH_OSD_FLAG_READ;

	lreq->reg_req = alloc_linger_request(lreq);
	if (!lreq->reg_req) {
		ret = -ENOMEM;
		goto out_put_lreq;
	}

	/* for notify_id */
	pages = ceph_alloc_page_vector(1, GFP_NOIO);
	if (IS_ERR(pages)) {
		ret = PTR_ERR(pages);
		goto out_put_lreq;
	}

	down_write(&osdc->lock);
	linger_register(lreq); /* before osd_req_op_* */
	ret = osd_req_op_notify_init(lreq->reg_req, 0, lreq->linger_id, 1,
				     timeout, payload, payload_len);
	if (ret) {
		linger_unregister(lreq);
		up_write(&osdc->lock);
		ceph_release_page_vector(pages, 1);
		goto out_put_lreq;
	}
	ceph_osd_data_pages_init(osd_req_op_data(lreq->reg_req, 0, notify,
						 response_data),
				 pages, PAGE_SIZE, 0, false, true);
	linger_submit(lreq);
	up_write(&osdc->lock);

	ret = linger_reg_commit_wait(lreq);
	if (!ret)
		ret = linger_notify_finish_wait(lreq);
	else
		dout("lreq %p failed to initiate notify %d\n", lreq, ret);

	linger_cancel(lreq);
out_put_lreq:
	linger_put(lreq);
	return ret;
}
EXPORT_SYMBOL(ceph_osdc_notify);

4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100
/*
 * Return the number of milliseconds since the watch was last
 * confirmed, or an error.  If there is an error, the watch is no
 * longer valid, and should be destroyed with ceph_osdc_unwatch().
 */
int ceph_osdc_watch_check(struct ceph_osd_client *osdc,
			  struct ceph_osd_linger_request *lreq)
{
	unsigned long stamp, age;
	int ret;

	down_read(&osdc->lock);
	mutex_lock(&lreq->lock);
	stamp = lreq->watch_valid_thru;
	if (!list_empty(&lreq->pending_lworks)) {
		struct linger_work *lwork =
		    list_first_entry(&lreq->pending_lworks,
				     struct linger_work,
				     pending_item);

		if (time_before(lwork->queued_stamp, stamp))
			stamp = lwork->queued_stamp;
	}
	age = jiffies - stamp;
	dout("%s lreq %p linger_id %llu age %lu last_error %d\n", __func__,
	     lreq, lreq->linger_id, age, lreq->last_error);
	/* we are truncating to msecs, so return a safe upper bound */
	ret = lreq->last_error ?: 1 + jiffies_to_msecs(age);

	mutex_unlock(&lreq->lock);
	up_read(&osdc->lock);
	return ret;
}

4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208
static int decode_watcher(void **p, void *end, struct ceph_watch_item *item)
{
	u8 struct_v;
	u32 struct_len;
	int ret;

	ret = ceph_start_decoding(p, end, 2, "watch_item_t",
				  &struct_v, &struct_len);
	if (ret)
		return ret;

	ceph_decode_copy(p, &item->name, sizeof(item->name));
	item->cookie = ceph_decode_64(p);
	*p += 4; /* skip timeout_seconds */
	if (struct_v >= 2) {
		ceph_decode_copy(p, &item->addr, sizeof(item->addr));
		ceph_decode_addr(&item->addr);
	}

	dout("%s %s%llu cookie %llu addr %s\n", __func__,
	     ENTITY_NAME(item->name), item->cookie,
	     ceph_pr_addr(&item->addr.in_addr));
	return 0;
}

static int decode_watchers(void **p, void *end,
			   struct ceph_watch_item **watchers,
			   u32 *num_watchers)
{
	u8 struct_v;
	u32 struct_len;
	int i;
	int ret;

	ret = ceph_start_decoding(p, end, 1, "obj_list_watch_response_t",
				  &struct_v, &struct_len);
	if (ret)
		return ret;

	*num_watchers = ceph_decode_32(p);
	*watchers = kcalloc(*num_watchers, sizeof(**watchers), GFP_NOIO);
	if (!*watchers)
		return -ENOMEM;

	for (i = 0; i < *num_watchers; i++) {
		ret = decode_watcher(p, end, *watchers + i);
		if (ret) {
			kfree(*watchers);
			return ret;
		}
	}

	return 0;
}

/*
 * On success, the caller is responsible for:
 *
 *     kfree(watchers);
 */
int ceph_osdc_list_watchers(struct ceph_osd_client *osdc,
			    struct ceph_object_id *oid,
			    struct ceph_object_locator *oloc,
			    struct ceph_watch_item **watchers,
			    u32 *num_watchers)
{
	struct ceph_osd_request *req;
	struct page **pages;
	int ret;

	req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
	if (!req)
		return -ENOMEM;

	ceph_oid_copy(&req->r_base_oid, oid);
	ceph_oloc_copy(&req->r_base_oloc, oloc);
	req->r_flags = CEPH_OSD_FLAG_READ;

	ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
	if (ret)
		goto out_put_req;

	pages = ceph_alloc_page_vector(1, GFP_NOIO);
	if (IS_ERR(pages)) {
		ret = PTR_ERR(pages);
		goto out_put_req;
	}

	osd_req_op_init(req, 0, CEPH_OSD_OP_LIST_WATCHERS, 0);
	ceph_osd_data_pages_init(osd_req_op_data(req, 0, list_watchers,
						 response_data),
				 pages, PAGE_SIZE, 0, false, true);

	ceph_osdc_start_request(osdc, req, false);
	ret = ceph_osdc_wait_request(osdc, req);
	if (ret >= 0) {
		void *p = page_address(pages[0]);
		void *const end = p + req->r_ops[0].outdata_len;

		ret = decode_watchers(&p, end, watchers, num_watchers);
	}

out_put_req:
	ceph_osdc_put_request(req);
	return ret;
}
EXPORT_SYMBOL(ceph_osdc_list_watchers);

4209 4210 4211 4212
/*
 * Call all pending notify callbacks - for use after a watch is
 * unregistered, to make sure no more callbacks for it will be invoked
 */
S
stephen hemminger 已提交
4213
void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
4214
{
4215
	dout("%s osdc %p\n", __func__, osdc);
4216 4217 4218 4219
	flush_workqueue(osdc->notify_wq);
}
EXPORT_SYMBOL(ceph_osdc_flush_notifies);

4220 4221 4222 4223 4224 4225 4226
void ceph_osdc_maybe_request_map(struct ceph_osd_client *osdc)
{
	down_read(&osdc->lock);
	maybe_request_map(osdc);
	up_read(&osdc->lock);
}
EXPORT_SYMBOL(ceph_osdc_maybe_request_map);
4227

4228 4229 4230 4231
/*
 * Execute an OSD class method on an object.
 *
 * @flags: CEPH_OSD_FLAG_*
4232
 * @resp_len: in/out param for reply length
4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244
 */
int ceph_osdc_call(struct ceph_osd_client *osdc,
		   struct ceph_object_id *oid,
		   struct ceph_object_locator *oloc,
		   const char *class, const char *method,
		   unsigned int flags,
		   struct page *req_page, size_t req_len,
		   struct page *resp_page, size_t *resp_len)
{
	struct ceph_osd_request *req;
	int ret;

4245 4246 4247
	if (req_len > PAGE_SIZE || (resp_page && *resp_len > PAGE_SIZE))
		return -E2BIG;

4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265
	req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
	if (!req)
		return -ENOMEM;

	ceph_oid_copy(&req->r_base_oid, oid);
	ceph_oloc_copy(&req->r_base_oloc, oloc);
	req->r_flags = flags;

	ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
	if (ret)
		goto out_put_req;

	osd_req_op_cls_init(req, 0, CEPH_OSD_OP_CALL, class, method);
	if (req_page)
		osd_req_op_cls_request_data_pages(req, 0, &req_page, req_len,
						  0, false, false);
	if (resp_page)
		osd_req_op_cls_response_data_pages(req, 0, &resp_page,
4266
						   *resp_len, 0, false, false);
4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281

	ceph_osdc_start_request(osdc, req, false);
	ret = ceph_osdc_wait_request(osdc, req);
	if (ret >= 0) {
		ret = req->r_ops[0].rval;
		if (resp_page)
			*resp_len = req->r_ops[0].outdata_len;
	}

out_put_req:
	ceph_osdc_put_request(req);
	return ret;
}
EXPORT_SYMBOL(ceph_osdc_call);

S
Sage Weil 已提交
4282 4283 4284 4285 4286 4287 4288 4289 4290
/*
 * init, shutdown
 */
int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
{
	int err;

	dout("init\n");
	osdc->client = client;
4291
	init_rwsem(&osdc->lock);
S
Sage Weil 已提交
4292
	osdc->osds = RB_ROOT;
4293
	INIT_LIST_HEAD(&osdc->osd_lru);
4294
	spin_lock_init(&osdc->osd_lru_lock);
4295 4296 4297
	osd_init(&osdc->homeless_osd);
	osdc->homeless_osd.o_osdc = osdc;
	osdc->homeless_osd.o_osd = CEPH_HOMELESS_OSD;
4298
	osdc->last_linger_id = CEPH_LINGER_ID_START;
4299
	osdc->linger_requests = RB_ROOT;
I
Ilya Dryomov 已提交
4300 4301
	osdc->map_checks = RB_ROOT;
	osdc->linger_map_checks = RB_ROOT;
S
Sage Weil 已提交
4302
	INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
4303 4304
	INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);

4305
	err = -ENOMEM;
4306 4307 4308 4309
	osdc->osdmap = ceph_osdmap_alloc();
	if (!osdc->osdmap)
		goto out;

4310 4311
	osdc->req_mempool = mempool_create_slab_pool(10,
						     ceph_osd_request_cache);
S
Sage Weil 已提交
4312
	if (!osdc->req_mempool)
4313
		goto out_map;
S
Sage Weil 已提交
4314

4315
	err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
4316
				PAGE_SIZE, 10, true, "osd_op");
S
Sage Weil 已提交
4317
	if (err < 0)
4318
		goto out_mempool;
4319
	err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
4320
				PAGE_SIZE, 10, true, "osd_op_reply");
S
Sage Weil 已提交
4321 4322
	if (err < 0)
		goto out_msgpool;
4323

4324
	err = -ENOMEM;
4325
	osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
4326
	if (!osdc->notify_wq)
4327 4328
		goto out_msgpool_reply;

4329 4330
	schedule_delayed_work(&osdc->timeout_work,
			      osdc->client->options->osd_keepalive_timeout);
4331 4332 4333
	schedule_delayed_work(&osdc->osds_timeout_work,
	    round_jiffies_relative(osdc->client->options->osd_idle_ttl));

S
Sage Weil 已提交
4334
	return 0;
4335

4336 4337
out_msgpool_reply:
	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
S
Sage Weil 已提交
4338 4339
out_msgpool:
	ceph_msgpool_destroy(&osdc->msgpool_op);
4340 4341
out_mempool:
	mempool_destroy(osdc->req_mempool);
4342 4343
out_map:
	ceph_osdmap_destroy(osdc->osdmap);
4344 4345
out:
	return err;
S
Sage Weil 已提交
4346 4347 4348 4349
}

void ceph_osdc_stop(struct ceph_osd_client *osdc)
{
4350 4351
	flush_workqueue(osdc->notify_wq);
	destroy_workqueue(osdc->notify_wq);
S
Sage Weil 已提交
4352
	cancel_delayed_work_sync(&osdc->timeout_work);
4353
	cancel_delayed_work_sync(&osdc->osds_timeout_work);
4354

4355
	down_write(&osdc->lock);
4356 4357 4358
	while (!RB_EMPTY_ROOT(&osdc->osds)) {
		struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
						struct ceph_osd, o_node);
4359
		close_osd(osd);
4360
	}
4361
	up_write(&osdc->lock);
4362
	WARN_ON(refcount_read(&osdc->homeless_osd.o_ref) != 1);
4363 4364 4365
	osd_cleanup(&osdc->homeless_osd);

	WARN_ON(!list_empty(&osdc->osd_lru));
4366
	WARN_ON(!RB_EMPTY_ROOT(&osdc->linger_requests));
I
Ilya Dryomov 已提交
4367 4368
	WARN_ON(!RB_EMPTY_ROOT(&osdc->map_checks));
	WARN_ON(!RB_EMPTY_ROOT(&osdc->linger_map_checks));
4369 4370
	WARN_ON(atomic_read(&osdc->num_requests));
	WARN_ON(atomic_read(&osdc->num_homeless));
4371

4372
	ceph_osdmap_destroy(osdc->osdmap);
S
Sage Weil 已提交
4373 4374
	mempool_destroy(osdc->req_mempool);
	ceph_msgpool_destroy(&osdc->msgpool_op);
S
Sage Weil 已提交
4375
	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
S
Sage Weil 已提交
4376 4377 4378 4379 4380 4381 4382 4383 4384 4385
}

/*
 * 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,
4386
			struct page **pages, int num_pages, int page_align)
S
Sage Weil 已提交
4387 4388 4389 4390 4391 4392
{
	struct ceph_osd_request *req;
	int rc = 0;

	dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
	     vino.snap, off, *plen);
4393
	req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1,
S
Sage Weil 已提交
4394
				    CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
4395
				    NULL, truncate_seq, truncate_size,
4396
				    false);
4397 4398
	if (IS_ERR(req))
		return PTR_ERR(req);
S
Sage Weil 已提交
4399 4400

	/* it may be a short read due to an object boundary */
4401
	osd_req_op_extent_osd_data_pages(req, 0,
4402
				pages, *plen, page_align, false, false);
S
Sage Weil 已提交
4403

4404
	dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
4405
	     off, *plen, *plen, page_align);
S
Sage Weil 已提交
4406 4407 4408 4409 4410 4411 4412 4413 4414

	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;
}
4415
EXPORT_SYMBOL(ceph_osdc_readpages);
S
Sage Weil 已提交
4416 4417 4418 4419 4420 4421 4422 4423 4424 4425

/*
 * 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,
4426
			 struct page **pages, int num_pages)
S
Sage Weil 已提交
4427 4428 4429
{
	struct ceph_osd_request *req;
	int rc = 0;
4430
	int page_align = off & ~PAGE_MASK;
S
Sage Weil 已提交
4431

4432
	req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
4433
				    CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
4434
				    snapc, truncate_seq, truncate_size,
4435
				    true);
4436 4437
	if (IS_ERR(req))
		return PTR_ERR(req);
S
Sage Weil 已提交
4438 4439

	/* it may be a short write due to an object boundary */
4440
	osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
4441 4442
				false, false);
	dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
S
Sage Weil 已提交
4443

4444
	req->r_mtime = *mtime;
4445
	rc = ceph_osdc_start_request(osdc, req, true);
S
Sage Weil 已提交
4446 4447 4448 4449 4450 4451 4452 4453 4454
	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;
}
4455
EXPORT_SYMBOL(ceph_osdc_writepages);
S
Sage Weil 已提交
4456

4457 4458
int ceph_osdc_setup(void)
{
4459 4460 4461
	size_t size = sizeof(struct ceph_osd_request) +
	    CEPH_OSD_SLAB_OPS * sizeof(struct ceph_osd_req_op);

4462
	BUG_ON(ceph_osd_request_cache);
4463 4464
	ceph_osd_request_cache = kmem_cache_create("ceph_osd_request", size,
						   0, 0, NULL);
4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477

	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
Sage Weil 已提交
4478 4479 4480 4481 4482 4483
/*
 * handle incoming message
 */
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
{
	struct ceph_osd *osd = con->private;
4484
	struct ceph_osd_client *osdc = osd->o_osdc;
S
Sage Weil 已提交
4485 4486 4487 4488 4489 4490 4491
	int type = le16_to_cpu(msg->hdr.type);

	switch (type) {
	case CEPH_MSG_OSD_MAP:
		ceph_osdc_handle_map(osdc, msg);
		break;
	case CEPH_MSG_OSD_OPREPLY:
4492
		handle_reply(osd, msg);
S
Sage Weil 已提交
4493
		break;
4494 4495 4496
	case CEPH_MSG_WATCH_NOTIFY:
		handle_watch_notify(osdc, msg);
		break;
S
Sage Weil 已提交
4497 4498 4499 4500 4501

	default:
		pr_err("received unknown message type %d %s\n", type,
		       ceph_msg_type_name(type));
	}
4502

S
Sage Weil 已提交
4503 4504 4505
	ceph_msg_put(msg);
}

4506
/*
4507 4508 4509
 * Lookup and return message for incoming reply.  Don't try to do
 * anything about a larger than preallocated data portion of the
 * message at the moment - for now, just skip the message.
4510 4511
 */
static struct ceph_msg *get_reply(struct ceph_connection *con,
4512 4513
				  struct ceph_msg_header *hdr,
				  int *skip)
S
Sage Weil 已提交
4514 4515 4516
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc = osd->o_osdc;
4517
	struct ceph_msg *m = NULL;
4518
	struct ceph_osd_request *req;
4519
	int front_len = le32_to_cpu(hdr->front_len);
4520
	int data_len = le32_to_cpu(hdr->data_len);
4521
	u64 tid = le64_to_cpu(hdr->tid);
S
Sage Weil 已提交
4522

4523 4524 4525 4526 4527 4528 4529 4530 4531 4532
	down_read(&osdc->lock);
	if (!osd_registered(osd)) {
		dout("%s osd%d unknown, skipping\n", __func__, osd->o_osd);
		*skip = 1;
		goto out_unlock_osdc;
	}
	WARN_ON(osd->o_osd != le64_to_cpu(hdr->src.num));

	mutex_lock(&osd->lock);
	req = lookup_request(&osd->o_requests, tid);
4533
	if (!req) {
4534 4535
		dout("%s osd%d tid %llu unknown, skipping\n", __func__,
		     osd->o_osd, tid);
4536
		*skip = 1;
4537
		goto out_unlock_session;
4538
	}
S
Sage Weil 已提交
4539

4540
	ceph_msg_revoke_incoming(req->r_reply);
4541

4542
	if (front_len > req->r_reply->front_alloc_len) {
4543 4544 4545
		pr_warn("%s osd%d tid %llu front %d > preallocated %d\n",
			__func__, osd->o_osd, req->r_tid, front_len,
			req->r_reply->front_alloc_len);
4546 4547
		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
				 false);
4548
		if (!m)
4549
			goto out_unlock_session;
S
Sage Weil 已提交
4550 4551 4552
		ceph_msg_put(req->r_reply);
		req->r_reply = m;
	}
4553

4554 4555 4556 4557 4558 4559
	if (data_len > req->r_reply->data_length) {
		pr_warn("%s osd%d tid %llu data %d > preallocated %zu, skipping\n",
			__func__, osd->o_osd, req->r_tid, data_len,
			req->r_reply->data_length);
		m = NULL;
		*skip = 1;
4560
		goto out_unlock_session;
4561
	}
4562 4563

	m = ceph_msg_get(req->r_reply);
S
Sage Weil 已提交
4564
	dout("get_reply tid %lld %p\n", tid, m);
4565

4566 4567 4568 4569
out_unlock_session:
	mutex_unlock(&osd->lock);
out_unlock_osdc:
	up_read(&osdc->lock);
4570
	return m;
4571 4572
}

4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592
/*
 * TODO: switch to a msg-owned pagelist
 */
static struct ceph_msg *alloc_msg_with_page_vector(struct ceph_msg_header *hdr)
{
	struct ceph_msg *m;
	int type = le16_to_cpu(hdr->type);
	u32 front_len = le32_to_cpu(hdr->front_len);
	u32 data_len = le32_to_cpu(hdr->data_len);

	m = ceph_msg_new(type, front_len, GFP_NOIO, false);
	if (!m)
		return NULL;

	if (data_len) {
		struct page **pages;
		struct ceph_osd_data osd_data;

		pages = ceph_alloc_page_vector(calc_pages_for(0, data_len),
					       GFP_NOIO);
4593
		if (IS_ERR(pages)) {
4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605
			ceph_msg_put(m);
			return NULL;
		}

		ceph_osd_data_pages_init(&osd_data, pages, data_len, 0, false,
					 false);
		ceph_osdc_msg_data_add(m, &osd_data);
	}

	return m;
}

4606 4607 4608 4609 4610 4611 4612
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);

A
Alex Elder 已提交
4613
	*skip = 0;
4614 4615
	switch (type) {
	case CEPH_MSG_OSD_MAP:
4616
	case CEPH_MSG_WATCH_NOTIFY:
4617
		return alloc_msg_with_page_vector(hdr);
4618 4619 4620
	case CEPH_MSG_OSD_OPREPLY:
		return get_reply(con, hdr, skip);
	default:
4621 4622
		pr_warn("%s osd%d unknown msg type %d, skipping\n", __func__,
			osd->o_osd, type);
4623 4624 4625
		*skip = 1;
		return NULL;
	}
S
Sage Weil 已提交
4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644
}

/*
 * 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);
}

4645 4646 4647
/*
 * authentication
 */
4648 4649 4650 4651 4652
/*
 * 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,
4653
					int *proto, int force_new)
4654 4655 4656 4657
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;
4658
	struct ceph_auth_handshake *auth = &o->o_auth;
4659

4660
	if (force_new && auth->authorizer) {
4661
		ceph_auth_destroy_authorizer(auth->authorizer);
4662 4663
		auth->authorizer = NULL;
	}
4664 4665 4666
	if (!auth->authorizer) {
		int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
						      auth);
4667
		if (ret)
4668
			return ERR_PTR(ret);
4669 4670
	} else {
		int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
4671 4672 4673
						     auth);
		if (ret)
			return ERR_PTR(ret);
4674 4675
	}
	*proto = ac->protocol;
4676

4677
	return auth;
4678 4679 4680
}


4681
static int verify_authorizer_reply(struct ceph_connection *con)
4682 4683 4684 4685 4686
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;

4687
	return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer);
4688 4689
}

4690 4691 4692 4693 4694 4695
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;

4696
	ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
4697 4698
	return ceph_monc_validate_auth(&osdc->client->monc);
}
4699

4700 4701 4702 4703 4704
static void osd_reencode_message(struct ceph_msg *msg)
{
	encode_request_finish(msg);
}

4705
static int osd_sign_message(struct ceph_msg *msg)
Y
Yan, Zheng 已提交
4706
{
4707
	struct ceph_osd *o = msg->con->private;
Y
Yan, Zheng 已提交
4708
	struct ceph_auth_handshake *auth = &o->o_auth;
4709

Y
Yan, Zheng 已提交
4710 4711 4712
	return ceph_auth_sign_message(auth, msg);
}

4713
static int osd_check_message_signature(struct ceph_msg *msg)
Y
Yan, Zheng 已提交
4714
{
4715
	struct ceph_osd *o = msg->con->private;
Y
Yan, Zheng 已提交
4716
	struct ceph_auth_handshake *auth = &o->o_auth;
4717

Y
Yan, Zheng 已提交
4718 4719 4720
	return ceph_auth_check_message_signature(auth, msg);
}

4721
static const struct ceph_connection_operations osd_con_ops = {
S
Sage Weil 已提交
4722 4723 4724
	.get = get_osd_con,
	.put = put_osd_con,
	.dispatch = dispatch,
4725 4726
	.get_authorizer = get_authorizer,
	.verify_authorizer_reply = verify_authorizer_reply,
4727
	.invalidate_authorizer = invalidate_authorizer,
S
Sage Weil 已提交
4728
	.alloc_msg = alloc_msg,
4729
	.reencode_message = osd_reencode_message,
4730 4731
	.sign_message = osd_sign_message,
	.check_message_signature = osd_check_message_signature,
4732
	.fault = osd_fault,
S
Sage Weil 已提交
4733
};