osd_client.c 61.6 KB
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#include <linux/ceph/ceph_debug.h>
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#include <linux/module.h>
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#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
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#ifdef CONFIG_BLOCK
#include <linux/bio.h>
#endif
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#include <linux/ceph/libceph.h>
#include <linux/ceph/osd_client.h>
#include <linux/ceph/messenger.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/auth.h>
#include <linux/ceph/pagelist.h>
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#define OSD_OP_FRONT_LEN	4096
#define OSD_OPREPLY_FRONT_LEN	512
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static const struct ceph_connection_operations osd_con_ops;
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static void __send_queued(struct ceph_osd_client *osdc);
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static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
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static void __register_request(struct ceph_osd_client *osdc,
			       struct ceph_osd_request *req);
static void __unregister_linger_request(struct ceph_osd_client *osdc,
					struct ceph_osd_request *req);
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static void __send_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req);
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static int op_has_extent(int op)
{
	return (op == CEPH_OSD_OP_READ ||
		op == CEPH_OSD_OP_WRITE);
}

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

/*
 * calculate the mapping of a file extent onto an object, and fill out the
 * request accordingly.  shorten extent as necessary if it crosses an
 * object boundary.
 *
 * fill osd op in request message.
 */
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static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
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		       struct ceph_osd_req_op *op, 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);
	}

	if (op_has_extent(op->op)) {
		u32 osize = le32_to_cpu(layout->fl_object_size);
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		op->extent.offset = *objoff;
		op->extent.length = *objlen;
		if (op->extent.truncate_size <= off - *objoff) {
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			op->extent.truncate_size = 0;
		} else {
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			op->extent.truncate_size -= off - *objoff;
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			if (op->extent.truncate_size > osize)
				op->extent.truncate_size = osize;
		}
	}
	if (op->op == CEPH_OSD_OP_WRITE)
		op->payload_len = *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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}

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

	if (req->r_request)
		ceph_msg_put(req->r_request);
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	if (req->r_con_filling_msg) {
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		dout("%s revoking msg %p from con %p\n", __func__,
		     req->r_reply, req->r_con_filling_msg);
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		ceph_msg_revoke_incoming(req->r_reply);
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		req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
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		req->r_con_filling_msg = NULL;
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	}
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	if (req->r_reply)
		ceph_msg_put(req->r_reply);
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	if (req->r_data_in.type == CEPH_OSD_DATA_TYPE_PAGES &&
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			req->r_data_in.own_pages) {
		num_pages = calc_pages_for((u64)req->r_data_in.alignment,
						(u64)req->r_data_in.length);
		ceph_release_page_vector(req->r_data_in.pages, num_pages);
	}
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	if (req->r_data_out.type == CEPH_OSD_DATA_TYPE_PAGES &&
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			req->r_data_out.own_pages) {
		num_pages = calc_pages_for((u64)req->r_data_out.alignment,
						(u64)req->r_data_out.length);
		ceph_release_page_vector(req->r_data_out.pages, num_pages);
	}
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	ceph_put_snap_context(req->r_snapc);
	if (req->r_mempool)
		mempool_free(req, req->r_osdc->req_mempool);
	else
		kfree(req);
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}
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EXPORT_SYMBOL(ceph_osdc_release_request);
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struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
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					       struct ceph_snap_context *snapc,
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					       unsigned int num_ops,
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					       bool use_mempool,
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					       gfp_t gfp_flags)
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{
	struct ceph_osd_request *req;
	struct ceph_msg *msg;
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	size_t msg_size;

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

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	/* create reply message */
	if (use_mempool)
		msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
	else
		msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
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				   OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
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	if (!msg) {
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		ceph_osdc_put_request(req);
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		return NULL;
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	}
	req->r_reply = msg;

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

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

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/*
 * This is an osd op init function for opcodes that have no data or
 * other information associated with them.  It also serves as a
 * common init routine for all the other init functions, below.
 */
void osd_req_op_init(struct ceph_osd_req_op *op, u16 opcode)
{
	BUG_ON(!osd_req_opcode_valid(opcode));

	memset(op, 0, sizeof (*op));

	op->op = opcode;
}

void osd_req_op_extent_init(struct ceph_osd_req_op *op, u16 opcode,
				u64 offset, u64 length,
				u64 truncate_size, u32 truncate_seq)
{
	size_t payload_len = 0;

	BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);

	osd_req_op_init(op, opcode);

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

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

void osd_req_op_cls_init(struct ceph_osd_req_op *op, u16 opcode,
			const char *class, const char *method,
			const void *request_data, size_t request_data_size)
{
	size_t payload_len = 0;
	size_t size;

	BUG_ON(opcode != CEPH_OSD_OP_CALL);

	osd_req_op_init(op, opcode);

	op->cls.class_name = class;
	size = strlen(class);
	BUG_ON(size > (size_t) U8_MAX);
	op->cls.class_len = size;
	payload_len += size;

	op->cls.method_name = method;
	size = strlen(method);
	BUG_ON(size > (size_t) U8_MAX);
	op->cls.method_len = size;
	payload_len += size;

	op->cls.indata = request_data;
	BUG_ON(request_data_size > (size_t) U32_MAX);
	op->cls.indata_len = (u32) request_data_size;
	payload_len += request_data_size;

	op->cls.argc = 0;	/* currently unused */

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

void osd_req_op_watch_init(struct ceph_osd_req_op *op, u16 opcode,
				u64 cookie, u64 version, int flag)
{
	BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);

	osd_req_op_init(op, opcode);

	op->watch.cookie = cookie;
	/* op->watch.ver = version; */	/* XXX 3847 */
	op->watch.ver = cpu_to_le64(version);
	if (opcode == CEPH_OSD_OP_WATCH && flag)
		op->watch.flag = (u8) 1;
}
EXPORT_SYMBOL(osd_req_op_watch_init);

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static u64 osd_req_encode_op(struct ceph_osd_request *req,
			      struct ceph_osd_op *dst,
			      struct ceph_osd_req_op *src)
{
	u64 out_data_len = 0;
	struct ceph_pagelist *pagelist;

	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:
		if (src->op == CEPH_OSD_OP_WRITE)
			out_data_len = src->extent.length;
		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:
		pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
		BUG_ON(!pagelist);
		ceph_pagelist_init(pagelist);

		dst->cls.class_len = src->cls.class_len;
		dst->cls.method_len = src->cls.method_len;
		dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
		ceph_pagelist_append(pagelist, src->cls.class_name,
				     src->cls.class_len);
		ceph_pagelist_append(pagelist, src->cls.method_name,
				     src->cls.method_len);
		ceph_pagelist_append(pagelist, src->cls.indata,
				     src->cls.indata_len);

		req->r_data_out.type = CEPH_OSD_DATA_TYPE_PAGELIST;
		req->r_data_out.pagelist = pagelist;
		out_data_len = pagelist->length;
		break;
	case CEPH_OSD_OP_STARTSYNC:
		break;
	case CEPH_OSD_OP_NOTIFY_ACK:
	case CEPH_OSD_OP_WATCH:
		dst->watch.cookie = cpu_to_le64(src->watch.cookie);
		dst->watch.ver = cpu_to_le64(src->watch.ver);
		dst->watch.flag = src->watch.flag;
		break;
	default:
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		pr_err("unsupported osd opcode %s\n",
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			ceph_osd_op_name(src->op));
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		WARN_ON(1);
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		return 0;
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	}
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	dst->op = cpu_to_le16(src->op);
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	dst->payload_len = cpu_to_le32(src->payload_len);
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	return out_data_len;
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}

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/*
 * build new request AND message
 *
 */
void ceph_osdc_build_request(struct ceph_osd_request *req,
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			     u64 off, unsigned int num_ops,
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			     struct ceph_osd_req_op *src_ops,
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			     struct ceph_snap_context *snapc, u64 snap_id,
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			     struct timespec *mtime)
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{
	struct ceph_msg *msg = req->r_request;
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	struct ceph_osd_req_op *src_op;
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	void *p;
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	size_t msg_size;
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	int flags = req->r_flags;
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	u64 data_len;
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	int i;
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	req->r_num_ops = num_ops;
	req->r_snapid = snap_id;
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	req->r_snapc = ceph_get_snap_context(snapc);

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

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

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

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

	/* oid */
	ceph_encode_32(&p, req->r_oid_len);
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	memcpy(p, req->r_oid, req->r_oid_len);
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	dout("oid '%.*s' len %d\n", req->r_oid_len, req->r_oid, req->r_oid_len);
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	p += req->r_oid_len;
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	/* ops--can imply data */
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	ceph_encode_16(&p, num_ops);
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	src_op = src_ops;
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	req->r_request_ops = p;
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	data_len = 0;
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	for (i = 0; i < num_ops; i++, src_op++) {
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		data_len += osd_req_encode_op(req, p, src_op);
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		p += sizeof(struct ceph_osd_op);
	}
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	/* snaps */
	ceph_encode_64(&p, req->r_snapid);
	ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
	ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
	if (req->r_snapc) {
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		for (i = 0; i < snapc->num_snaps; i++) {
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			ceph_encode_64(&p, req->r_snapc->snaps[i]);
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		}
	}

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

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

		/*
		 * The header "data_off" is a hint to the receiver
		 * allowing it to align received data into its
		 * buffers such that there's no need to re-copy
		 * it before writing it to disk (direct I/O).
		 */
		data_off = (u16) (off & 0xffff);
		req->r_request->hdr.data_off = cpu_to_le16(data_off);
	}
535
	req->r_request->hdr.data_len = cpu_to_le32(data_len);
536

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	BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
538 539 540
	msg_size = p - msg->front.iov_base;
	msg->front.iov_len = msg_size;
	msg->hdr.front_len = cpu_to_le32(msg_size);
541 542 543

	dout("build_request msg_size was %d num_ops %d\n", (int)msg_size,
	     num_ops);
544 545
	return;
}
546
EXPORT_SYMBOL(ceph_osdc_build_request);
547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568

/*
 * build new request AND message, calculate layout, and adjust file
 * extent as needed.
 *
 * if the file was recently truncated, we include information about its
 * old and new size so that the object can be updated appropriately.  (we
 * avoid synchronously deleting truncated objects because it's slow.)
 *
 * if @do_sync, include a 'startsync' command so that the osd will flush
 * data quickly.
 */
struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
					       struct ceph_file_layout *layout,
					       struct ceph_vino vino,
					       u64 off, u64 *plen,
					       int opcode, int flags,
					       struct ceph_snap_context *snapc,
					       int do_sync,
					       u32 truncate_seq,
					       u64 truncate_size,
					       struct timespec *mtime,
569
					       bool use_mempool)
570
{
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	struct ceph_osd_req_op ops[2];
572
	struct ceph_osd_request *req;
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	unsigned int num_op = 1;
574 575 576
	u64 objnum = 0;
	u64 objoff = 0;
	u64 objlen = 0;
577
	int r;
578

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	memset(&ops, 0, sizeof ops);

581 582 583 584 585 586
	ops[0].op = opcode;
	ops[0].extent.truncate_seq = truncate_seq;
	ops[0].extent.truncate_size = truncate_size;

	if (do_sync) {
		ops[1].op = CEPH_OSD_OP_STARTSYNC;
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		num_op++;
	}
589

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	req = ceph_osdc_alloc_request(osdc, snapc, num_op, use_mempool,
					GFP_NOFS);
592
	if (!req)
593
		return ERR_PTR(-ENOMEM);
594
	req->r_flags = flags;
595 596

	/* calculate max write size */
597
	r = calc_layout(layout, off, plen, ops, &objnum, &objoff, &objlen);
598 599
	if (r < 0) {
		ceph_osdc_put_request(req);
600
		return ERR_PTR(r);
601
	}
602 603
	req->r_file_layout = *layout;  /* keep a copy */

604 605
	snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx",
		vino.ino, objnum);
606 607
	req->r_oid_len = strlen(req->r_oid);

608
	ceph_osdc_build_request(req, off, num_op, ops,
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				snapc, vino.snap, mtime);
610

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	return req;
}
613
EXPORT_SYMBOL(ceph_osdc_new_request);
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/*
 * We keep osd requests in an rbtree, sorted by ->r_tid.
 */
static void __insert_request(struct ceph_osd_client *osdc,
			     struct ceph_osd_request *new)
{
	struct rb_node **p = &osdc->requests.rb_node;
	struct rb_node *parent = NULL;
	struct ceph_osd_request *req = NULL;

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

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

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

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

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

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

680 681 682 683 684 685
/*
 * Resubmit requests pending on the given osd.
 */
static void __kick_osd_requests(struct ceph_osd_client *osdc,
				struct ceph_osd *osd)
{
686
	struct ceph_osd_request *req, *nreq;
687
	LIST_HEAD(resend);
688 689 690 691
	int err;

	dout("__kick_osd_requests osd%d\n", osd->o_osd);
	err = __reset_osd(osdc, osd);
692
	if (err)
693
		return;
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710
	/*
	 * Build up a list of requests to resend by traversing the
	 * osd's list of requests.  Requests for a given object are
	 * sent in tid order, and that is also the order they're
	 * kept on this list.  Therefore all requests that are in
	 * flight will be found first, followed by all requests that
	 * have not yet been sent.  And to resend requests while
	 * preserving this order we will want to put any sent
	 * requests back on the front of the osd client's unsent
	 * list.
	 *
	 * So we build a separate ordered list of already-sent
	 * requests for the affected osd and splice it onto the
	 * front of the osd client's unsent list.  Once we've seen a
	 * request that has not yet been sent we're done.  Those
	 * requests are already sitting right where they belong.
	 */
711
	list_for_each_entry(req, &osd->o_requests, r_osd_item) {
712 713 714 715
		if (!req->r_sent)
			break;
		list_move_tail(&req->r_req_lru_item, &resend);
		dout("requeueing %p tid %llu osd%d\n", req, req->r_tid,
716
		     osd->o_osd);
717 718 719
		if (!req->r_linger)
			req->r_flags |= CEPH_OSD_FLAG_RETRY;
	}
720
	list_splice(&resend, &osdc->req_unsent);
721

722 723 724 725 726
	/*
	 * Linger requests are re-registered before sending, which
	 * sets up a new tid for each.  We add them to the unsent
	 * list at the end to keep things in tid order.
	 */
727 728
	list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
				 r_linger_osd) {
729 730 731 732 733
		/*
		 * reregister request prior to unregistering linger so
		 * that r_osd is preserved.
		 */
		BUG_ON(!list_empty(&req->r_req_lru_item));
734
		__register_request(osdc, req);
735
		list_add_tail(&req->r_req_lru_item, &osdc->req_unsent);
736
		list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
737
		__unregister_linger_request(osdc, req);
738 739
		dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
		     osd->o_osd);
740 741 742
	}
}

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/*
744
 * If the osd connection drops, we need to resubmit all requests.
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 */
static void osd_reset(struct ceph_connection *con)
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc;

	if (!osd)
		return;
	dout("osd_reset osd%d\n", osd->o_osd);
	osdc = osd->o_osdc;
	down_read(&osdc->map_sem);
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	mutex_lock(&osdc->request_mutex);
	__kick_osd_requests(osdc, osd);
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	__send_queued(osdc);
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	mutex_unlock(&osdc->request_mutex);
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	up_read(&osdc->map_sem);
}

/*
 * Track open sessions with osds.
 */
766
static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
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{
	struct ceph_osd *osd;

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

	atomic_set(&osd->o_ref, 1);
	osd->o_osdc = osdc;
776
	osd->o_osd = onum;
777
	RB_CLEAR_NODE(&osd->o_node);
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	INIT_LIST_HEAD(&osd->o_requests);
779
	INIT_LIST_HEAD(&osd->o_linger_requests);
780
	INIT_LIST_HEAD(&osd->o_osd_lru);
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	osd->o_incarnation = 1;

783
	ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
784

785
	INIT_LIST_HEAD(&osd->o_keepalive_item);
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	return osd;
}

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

static void put_osd(struct ceph_osd *osd)
{
	dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
	     atomic_read(&osd->o_ref) - 1);
805
	if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
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		struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;

808
		ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
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		kfree(osd);
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	}
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}

/*
 * remove an osd from our map
 */
816
static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
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{
818
	dout("__remove_osd %p\n", osd);
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	BUG_ON(!list_empty(&osd->o_requests));
	rb_erase(&osd->o_node, &osdc->osds);
821
	list_del_init(&osd->o_osd_lru);
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	ceph_con_close(&osd->o_con);
	put_osd(osd);
}

826 827
static void remove_all_osds(struct ceph_osd_client *osdc)
{
828
	dout("%s %p\n", __func__, osdc);
829 830 831 832 833 834 835 836 837
	mutex_lock(&osdc->request_mutex);
	while (!RB_EMPTY_ROOT(&osdc->osds)) {
		struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
						struct ceph_osd, o_node);
		__remove_osd(osdc, osd);
	}
	mutex_unlock(&osdc->request_mutex);
}

838 839 840 841 842 843
static void __move_osd_to_lru(struct ceph_osd_client *osdc,
			      struct ceph_osd *osd)
{
	dout("__move_osd_to_lru %p\n", osd);
	BUG_ON(!list_empty(&osd->o_osd_lru));
	list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
844
	osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
845 846 847 848 849 850 851 852 853
}

static void __remove_osd_from_lru(struct ceph_osd *osd)
{
	dout("__remove_osd_from_lru %p\n", osd);
	if (!list_empty(&osd->o_osd_lru))
		list_del_init(&osd->o_osd_lru);
}

854
static void remove_old_osds(struct ceph_osd_client *osdc)
855 856 857 858 859 860
{
	struct ceph_osd *osd, *nosd;

	dout("__remove_old_osds %p\n", osdc);
	mutex_lock(&osdc->request_mutex);
	list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
861
		if (time_before(jiffies, osd->lru_ttl))
862 863 864 865 866 867
			break;
		__remove_osd(osdc, osd);
	}
	mutex_unlock(&osdc->request_mutex);
}

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/*
 * reset osd connect
 */
871
static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
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{
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	struct ceph_entity_addr *peer_addr;
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875
	dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
876 877
	if (list_empty(&osd->o_requests) &&
	    list_empty(&osd->o_linger_requests)) {
878
		__remove_osd(osdc, osd);
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		return -ENODEV;
	}

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

888 889 890 891 892
		dout(" osd addr hasn't changed and connection never opened,"
		     " letting msgr retry");
		/* touch each r_stamp for handle_timeout()'s benfit */
		list_for_each_entry(req, &osd->o_requests, r_osd_item)
			req->r_stamp = jiffies;
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		return -EAGAIN;
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	}
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	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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}

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

910
	dout("__insert_osd %p osd%d\n", new, new->o_osd);
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	while (*p) {
		parent = *p;
		osd = rb_entry(parent, struct ceph_osd, o_node);
		if (new->o_osd < osd->o_osd)
			p = &(*p)->rb_left;
		else if (new->o_osd > osd->o_osd)
			p = &(*p)->rb_right;
		else
			BUG();
	}

	rb_link_node(&new->o_node, parent, p);
	rb_insert_color(&new->o_node, &osdc->osds);
}

static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
{
	struct ceph_osd *osd;
	struct rb_node *n = osdc->osds.rb_node;

	while (n) {
		osd = rb_entry(n, struct ceph_osd, o_node);
		if (o < osd->o_osd)
			n = n->rb_left;
		else if (o > osd->o_osd)
			n = n->rb_right;
		else
			return osd;
	}
	return NULL;
}

943 944 945
static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
{
	schedule_delayed_work(&osdc->timeout_work,
946
			osdc->client->options->osd_keepalive_timeout * HZ);
947 948 949 950 951 952
}

static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
{
	cancel_delayed_work(&osdc->timeout_work);
}
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/*
 * Register request, assign tid.  If this is the first request, set up
 * the timeout event.
 */
958 959
static void __register_request(struct ceph_osd_client *osdc,
			       struct ceph_osd_request *req)
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960 961
{
	req->r_tid = ++osdc->last_tid;
962
	req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
963
	dout("__register_request %p tid %lld\n", req, req->r_tid);
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	__insert_request(osdc, req);
	ceph_osdc_get_request(req);
	osdc->num_requests++;
	if (osdc->num_requests == 1) {
968 969
		dout(" first request, scheduling timeout\n");
		__schedule_osd_timeout(osdc);
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	}
971 972
}

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/*
 * called under osdc->request_mutex
 */
static void __unregister_request(struct ceph_osd_client *osdc,
				 struct ceph_osd_request *req)
{
979 980 981 982 983 984
	if (RB_EMPTY_NODE(&req->r_node)) {
		dout("__unregister_request %p tid %lld not registered\n",
			req, req->r_tid);
		return;
	}

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	dout("__unregister_request %p tid %lld\n", req, req->r_tid);
	rb_erase(&req->r_node, &osdc->requests);
	osdc->num_requests--;

989 990
	if (req->r_osd) {
		/* make sure the original request isn't in flight. */
991
		ceph_msg_revoke(req->r_request);
992 993

		list_del_init(&req->r_osd_item);
994 995 996
		if (list_empty(&req->r_osd->o_requests) &&
		    list_empty(&req->r_osd->o_linger_requests)) {
			dout("moving osd to %p lru\n", req->r_osd);
997
			__move_osd_to_lru(osdc, req->r_osd);
998
		}
999
		if (list_empty(&req->r_linger_item))
1000
			req->r_osd = NULL;
1001
	}
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	list_del_init(&req->r_req_lru_item);
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	ceph_osdc_put_request(req);

1006 1007 1008
	if (osdc->num_requests == 0) {
		dout(" no requests, canceling timeout\n");
		__cancel_osd_timeout(osdc);
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	}
}

/*
 * Cancel a previously queued request message
 */
static void __cancel_request(struct ceph_osd_request *req)
{
1017
	if (req->r_sent && req->r_osd) {
1018
		ceph_msg_revoke(req->r_request);
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		req->r_sent = 0;
	}
}

1023 1024 1025 1026 1027
static void __register_linger_request(struct ceph_osd_client *osdc,
				    struct ceph_osd_request *req)
{
	dout("__register_linger_request %p\n", req);
	list_add_tail(&req->r_linger_item, &osdc->req_linger);
1028 1029 1030
	if (req->r_osd)
		list_add_tail(&req->r_linger_osd,
			      &req->r_osd->o_linger_requests);
1031 1032 1033 1034 1035 1036
}

static void __unregister_linger_request(struct ceph_osd_client *osdc,
					struct ceph_osd_request *req)
{
	dout("__unregister_linger_request %p\n", req);
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	list_del_init(&req->r_linger_item);
1038 1039 1040 1041 1042 1043 1044 1045
	if (req->r_osd) {
		list_del_init(&req->r_linger_osd);

		if (list_empty(&req->r_osd->o_requests) &&
		    list_empty(&req->r_osd->o_linger_requests)) {
			dout("moving osd to %p lru\n", req->r_osd);
			__move_osd_to_lru(osdc, req->r_osd);
		}
1046 1047
		if (list_empty(&req->r_osd_item))
			req->r_osd = NULL;
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
	}
}

void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
					 struct ceph_osd_request *req)
{
	mutex_lock(&osdc->request_mutex);
	if (req->r_linger) {
		__unregister_linger_request(osdc, req);
		ceph_osdc_put_request(req);
	}
	mutex_unlock(&osdc->request_mutex);
}
EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);

void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
				  struct ceph_osd_request *req)
{
	if (!req->r_linger) {
		dout("set_request_linger %p\n", req);
		req->r_linger = 1;
		/*
		 * caller is now responsible for calling
		 * unregister_linger_request
		 */
		ceph_osdc_get_request(req);
	}
}
EXPORT_SYMBOL(ceph_osdc_set_request_linger);

S
Sage Weil 已提交
1078 1079 1080
/*
 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
 * (as needed), and set the request r_osd appropriately.  If there is
L
Lucas De Marchi 已提交
1081
 * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1082
 * (unsent, homeless) or leave on in-flight lru.
S
Sage Weil 已提交
1083 1084 1085 1086 1087
 *
 * Return 0 if unchanged, 1 if changed, or negative on error.
 *
 * Caller should hold map_sem for read and request_mutex.
 */
1088
static int __map_request(struct ceph_osd_client *osdc,
1089
			 struct ceph_osd_request *req, int force_resend)
S
Sage Weil 已提交
1090
{
1091
	struct ceph_pg pgid;
1092 1093
	int acting[CEPH_PG_MAX_SIZE];
	int o = -1, num = 0;
S
Sage Weil 已提交
1094 1095
	int err;

1096
	dout("map_request %p tid %lld\n", req, req->r_tid);
1097 1098
	err = ceph_calc_ceph_pg(&pgid, req->r_oid, osdc->osdmap,
				ceph_file_layout_pg_pool(req->r_file_layout));
1099 1100
	if (err) {
		list_move(&req->r_req_lru_item, &osdc->req_notarget);
S
Sage Weil 已提交
1101
		return err;
1102
	}
1103 1104
	req->r_pgid = pgid;

1105 1106 1107 1108 1109
	err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
	if (err > 0) {
		o = acting[0];
		num = err;
	}
S
Sage Weil 已提交
1110

1111 1112
	if ((!force_resend &&
	     req->r_osd && req->r_osd->o_osd == o &&
1113 1114 1115
	     req->r_sent >= req->r_osd->o_incarnation &&
	     req->r_num_pg_osds == num &&
	     memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
S
Sage Weil 已提交
1116 1117 1118
	    (req->r_osd == NULL && o == -1))
		return 0;  /* no change */

1119 1120
	dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
	     req->r_tid, pgid.pool, pgid.seed, o,
S
Sage Weil 已提交
1121 1122
	     req->r_osd ? req->r_osd->o_osd : -1);

1123 1124 1125 1126
	/* record full pg acting set */
	memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
	req->r_num_pg_osds = num;

S
Sage Weil 已提交
1127 1128 1129 1130 1131 1132 1133 1134
	if (req->r_osd) {
		__cancel_request(req);
		list_del_init(&req->r_osd_item);
		req->r_osd = NULL;
	}

	req->r_osd = __lookup_osd(osdc, o);
	if (!req->r_osd && o >= 0) {
1135
		err = -ENOMEM;
1136
		req->r_osd = create_osd(osdc, o);
1137 1138
		if (!req->r_osd) {
			list_move(&req->r_req_lru_item, &osdc->req_notarget);
1139
			goto out;
1140
		}
S
Sage Weil 已提交
1141

1142
		dout("map_request osd %p is osd%d\n", req->r_osd, o);
S
Sage Weil 已提交
1143 1144
		__insert_osd(osdc, req->r_osd);

1145 1146 1147
		ceph_con_open(&req->r_osd->o_con,
			      CEPH_ENTITY_TYPE_OSD, o,
			      &osdc->osdmap->osd_addr[o]);
S
Sage Weil 已提交
1148 1149
	}

1150 1151
	if (req->r_osd) {
		__remove_osd_from_lru(req->r_osd);
1152 1153
		list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
		list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1154
	} else {
1155
		list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1156
	}
1157
	err = 1;   /* osd or pg changed */
S
Sage Weil 已提交
1158 1159 1160 1161 1162 1163 1164 1165

out:
	return err;
}

/*
 * caller should hold map_sem (for read) and request_mutex
 */
1166 1167
static void __send_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req)
S
Sage Weil 已提交
1168
{
1169
	void *p;
S
Sage Weil 已提交
1170

1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184
	dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
	     req, req->r_tid, req->r_osd->o_osd, req->r_flags,
	     (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);

	/* fill in message content that changes each time we send it */
	put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
	put_unaligned_le32(req->r_flags, req->r_request_flags);
	put_unaligned_le64(req->r_pgid.pool, req->r_request_pool);
	p = req->r_request_pgid;
	ceph_encode_64(&p, req->r_pgid.pool);
	ceph_encode_32(&p, req->r_pgid.seed);
	put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
	memcpy(req->r_request_reassert_version, &req->r_reassert_version,
	       sizeof(req->r_reassert_version));
1185

S
Sage Weil 已提交
1186
	req->r_stamp = jiffies;
1187
	list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
S
Sage Weil 已提交
1188 1189 1190 1191 1192 1193

	ceph_msg_get(req->r_request); /* send consumes a ref */
	ceph_con_send(&req->r_osd->o_con, req->r_request);
	req->r_sent = req->r_osd->o_incarnation;
}

1194 1195 1196
/*
 * Send any requests in the queue (req_unsent).
 */
A
Alex Elder 已提交
1197
static void __send_queued(struct ceph_osd_client *osdc)
1198 1199 1200
{
	struct ceph_osd_request *req, *tmp;

A
Alex Elder 已提交
1201 1202
	dout("__send_queued\n");
	list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1203 1204 1205
		__send_request(osdc, req);
}

S
Sage Weil 已提交
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218
/*
 * Timeout callback, called every N seconds when 1 or more osd
 * requests has been active for more than N seconds.  When this
 * happens, we ping all OSDs with requests who have timed out to
 * ensure any communications channel reset is detected.  Reset the
 * request timeouts another N seconds in the future as we go.
 * Reschedule the timeout event another N seconds in future (unless
 * there are no open requests).
 */
static void handle_timeout(struct work_struct *work)
{
	struct ceph_osd_client *osdc =
		container_of(work, struct ceph_osd_client, timeout_work.work);
S
Sage Weil 已提交
1219
	struct ceph_osd_request *req;
S
Sage Weil 已提交
1220
	struct ceph_osd *osd;
1221
	unsigned long keepalive =
1222
		osdc->client->options->osd_keepalive_timeout * HZ;
1223
	struct list_head slow_osds;
S
Sage Weil 已提交
1224 1225 1226 1227 1228 1229 1230
	dout("timeout\n");
	down_read(&osdc->map_sem);

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

	mutex_lock(&osdc->request_mutex);

1231 1232 1233 1234 1235 1236 1237
	/*
	 * ping osds that are a bit slow.  this ensures that if there
	 * is a break in the TCP connection we will notice, and reopen
	 * a connection with that osd (from the fault callback).
	 */
	INIT_LIST_HEAD(&slow_osds);
	list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
S
Sage Weil 已提交
1238
		if (time_before(jiffies, req->r_stamp + keepalive))
1239 1240 1241 1242 1243
			break;

		osd = req->r_osd;
		BUG_ON(!osd);
		dout(" tid %llu is slow, will send keepalive on osd%d\n",
S
Sage Weil 已提交
1244
		     req->r_tid, osd->o_osd);
1245 1246 1247 1248 1249 1250
		list_move_tail(&osd->o_keepalive_item, &slow_osds);
	}
	while (!list_empty(&slow_osds)) {
		osd = list_entry(slow_osds.next, struct ceph_osd,
				 o_keepalive_item);
		list_del_init(&osd->o_keepalive_item);
S
Sage Weil 已提交
1251 1252 1253
		ceph_con_keepalive(&osd->o_con);
	}

1254
	__schedule_osd_timeout(osdc);
A
Alex Elder 已提交
1255
	__send_queued(osdc);
S
Sage Weil 已提交
1256 1257 1258 1259
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
}

1260 1261 1262 1263 1264 1265
static void handle_osds_timeout(struct work_struct *work)
{
	struct ceph_osd_client *osdc =
		container_of(work, struct ceph_osd_client,
			     osds_timeout_work.work);
	unsigned long delay =
1266
		osdc->client->options->osd_idle_ttl * HZ >> 2;
1267 1268 1269

	dout("osds timeout\n");
	down_read(&osdc->map_sem);
1270
	remove_old_osds(osdc);
1271 1272 1273 1274 1275 1276
	up_read(&osdc->map_sem);

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

S
Sage Weil 已提交
1277 1278 1279 1280 1281 1282 1283
static void complete_request(struct ceph_osd_request *req)
{
	if (req->r_safe_callback)
		req->r_safe_callback(req, NULL);
	complete_all(&req->r_safe_completion);  /* fsync waiter */
}

1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
static int __decode_pgid(void **p, void *end, struct ceph_pg *pgid)
{
	__u8 v;

	ceph_decode_need(p, end, 1 + 8 + 4 + 4, bad);
	v = ceph_decode_8(p);
	if (v > 1) {
		pr_warning("do not understand pg encoding %d > 1", v);
		return -EINVAL;
	}
	pgid->pool = ceph_decode_64(p);
	pgid->seed = ceph_decode_32(p);
	*p += 4;
	return 0;

bad:
	pr_warning("incomplete pg encoding");
	return -EINVAL;
}

S
Sage Weil 已提交
1304 1305 1306 1307
/*
 * handle osd op reply.  either call the callback if it is specified,
 * or do the completion to wake up the waiting thread.
 */
1308 1309
static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
			 struct ceph_connection *con)
S
Sage Weil 已提交
1310
{
1311
	void *p, *end;
S
Sage Weil 已提交
1312 1313
	struct ceph_osd_request *req;
	u64 tid;
1314 1315
	int object_len;
	int numops, payload_len, flags;
1316
	s32 result;
1317 1318 1319 1320 1321 1322
	s32 retry_attempt;
	struct ceph_pg pg;
	int err;
	u32 reassert_epoch;
	u64 reassert_version;
	u32 osdmap_epoch;
1323
	int already_completed;
1324
	int i;
S
Sage Weil 已提交
1325

1326
	tid = le64_to_cpu(msg->hdr.tid);
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338
	dout("handle_reply %p tid %llu\n", msg, tid);

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

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

	err = __decode_pgid(&p, end, &pg);
	if (err)
S
Sage Weil 已提交
1339
		goto bad;
1340 1341 1342 1343 1344 1345 1346 1347

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

S
Sage Weil 已提交
1348 1349 1350 1351 1352 1353 1354 1355 1356
	/* lookup */
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (req == NULL) {
		dout("handle_reply tid %llu dne\n", tid);
		mutex_unlock(&osdc->request_mutex);
		return;
	}
	ceph_osdc_get_request(req);
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

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

	ceph_decode_need(&p, end, 4, bad);
	numops = ceph_decode_32(&p);
	if (numops > CEPH_OSD_MAX_OP)
		goto bad_put;
	if (numops != req->r_num_ops)
		goto bad_put;
	payload_len = 0;
	ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad);
	for (i = 0; i < numops; i++) {
		struct ceph_osd_op *op = p;
		int len;

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

	ceph_decode_need(&p, end, 4 + numops * 4, bad);
	retry_attempt = ceph_decode_32(&p);
	for (i = 0; i < numops; i++)
		req->r_reply_op_result[i] = ceph_decode_32(&p);
S
Sage Weil 已提交
1389

1390
	/*
1391
	 * if this connection filled our message, drop our reference now, to
1392 1393
	 * avoid a (safe but slower) revoke later.
	 */
1394
	if (req->r_con_filling_msg == con && req->r_reply == msg) {
S
Sage Weil 已提交
1395
		dout(" dropping con_filling_msg ref %p\n", con);
1396
		req->r_con_filling_msg = NULL;
1397
		con->ops->put(con);
1398 1399
	}

S
Sage Weil 已提交
1400
	if (!req->r_got_reply) {
1401
		unsigned int bytes;
S
Sage Weil 已提交
1402

1403
		req->r_result = result;
S
Sage Weil 已提交
1404 1405 1406 1407 1408 1409 1410
		bytes = le32_to_cpu(msg->hdr.data_len);
		dout("handle_reply result %d bytes %d\n", req->r_result,
		     bytes);
		if (req->r_result == 0)
			req->r_result = bytes;

		/* in case this is a write and we need to replay, */
1411 1412
		req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
		req->r_reassert_version.version = cpu_to_le64(reassert_version);
S
Sage Weil 已提交
1413 1414 1415 1416

		req->r_got_reply = 1;
	} else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
		dout("handle_reply tid %llu dup ack\n", tid);
S
Sage Weil 已提交
1417
		mutex_unlock(&osdc->request_mutex);
S
Sage Weil 已提交
1418 1419 1420 1421 1422
		goto done;
	}

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

1423 1424 1425
	if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
		__register_linger_request(osdc, req);

S
Sage Weil 已提交
1426
	/* either this is a read, or we got the safe response */
1427 1428
	if (result < 0 ||
	    (flags & CEPH_OSD_FLAG_ONDISK) ||
S
Sage Weil 已提交
1429 1430 1431
	    ((flags & CEPH_OSD_FLAG_WRITE) == 0))
		__unregister_request(osdc, req);

1432 1433
	already_completed = req->r_completed;
	req->r_completed = 1;
S
Sage Weil 已提交
1434
	mutex_unlock(&osdc->request_mutex);
1435 1436
	if (already_completed)
		goto done;
S
Sage Weil 已提交
1437 1438 1439 1440

	if (req->r_callback)
		req->r_callback(req, msg);
	else
1441
		complete_all(&req->r_completion);
S
Sage Weil 已提交
1442

S
Sage Weil 已提交
1443 1444
	if (flags & CEPH_OSD_FLAG_ONDISK)
		complete_request(req);
S
Sage Weil 已提交
1445 1446

done:
1447
	dout("req=%p req->r_linger=%d\n", req, req->r_linger);
S
Sage Weil 已提交
1448 1449 1450
	ceph_osdc_put_request(req);
	return;

1451 1452
bad_put:
	ceph_osdc_put_request(req);
S
Sage Weil 已提交
1453
bad:
1454 1455
	pr_err("corrupt osd_op_reply got %d %d\n",
	       (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1456
	ceph_msg_dump(msg);
S
Sage Weil 已提交
1457 1458
}

1459
static void reset_changed_osds(struct ceph_osd_client *osdc)
S
Sage Weil 已提交
1460 1461 1462
{
	struct rb_node *p, *n;

1463 1464
	for (p = rb_first(&osdc->osds); p; p = n) {
		struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
S
Sage Weil 已提交
1465

1466 1467 1468 1469 1470 1471 1472
		n = rb_next(p);
		if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
		    memcmp(&osd->o_con.peer_addr,
			   ceph_osd_addr(osdc->osdmap,
					 osd->o_osd),
			   sizeof(struct ceph_entity_addr)) != 0)
			__reset_osd(osdc, osd);
S
Sage Weil 已提交
1473
	}
1474 1475 1476
}

/*
1477 1478
 * Requeue requests whose mapping to an OSD has changed.  If requests map to
 * no osd, request a new map.
1479
 *
1480
 * Caller should hold map_sem for read.
1481
 */
1482
static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1483
{
1484
	struct ceph_osd_request *req, *nreq;
1485 1486 1487
	struct rb_node *p;
	int needmap = 0;
	int err;
1488

1489
	dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1490
	mutex_lock(&osdc->request_mutex);
1491
	for (p = rb_first(&osdc->requests); p; ) {
1492
		req = rb_entry(p, struct ceph_osd_request, r_node);
1493
		p = rb_next(p);
1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511

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

1512
		err = __map_request(osdc, req, force_resend);
1513 1514 1515 1516 1517 1518
		if (err < 0)
			continue;  /* error */
		if (req->r_osd == NULL) {
			dout("%p tid %llu maps to no osd\n", req, req->r_tid);
			needmap++;  /* request a newer map */
		} else if (err > 0) {
1519 1520 1521 1522
			if (!req->r_linger) {
				dout("%p tid %llu requeued on osd%d\n", req,
				     req->r_tid,
				     req->r_osd ? req->r_osd->o_osd : -1);
1523
				req->r_flags |= CEPH_OSD_FLAG_RETRY;
1524 1525
			}
		}
1526 1527 1528 1529 1530 1531
	}

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

1532
		err = __map_request(osdc, req, force_resend);
1533
		dout("__map_request returned %d\n", err);
1534 1535 1536 1537 1538 1539 1540 1541
		if (err == 0)
			continue;  /* no change and no osd was specified */
		if (err < 0)
			continue;  /* hrm! */
		if (req->r_osd == NULL) {
			dout("tid %llu maps to no valid osd\n", req->r_tid);
			needmap++;  /* request a newer map */
			continue;
1542
		}
1543 1544 1545 1546

		dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
		     req->r_osd ? req->r_osd->o_osd : -1);
		__register_request(osdc, req);
1547
		__unregister_linger_request(osdc, req);
1548
	}
S
Sage Weil 已提交
1549 1550 1551 1552 1553 1554
	mutex_unlock(&osdc->request_mutex);

	if (needmap) {
		dout("%d requests for down osds, need new map\n", needmap);
		ceph_monc_request_next_osdmap(&osdc->client->monc);
	}
1555
	reset_changed_osds(osdc);
1556
}
1557 1558


S
Sage Weil 已提交
1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581
/*
 * Process updated osd map.
 *
 * The message contains any number of incremental and full maps, normally
 * indicating some sort of topology change in the cluster.  Kick requests
 * off to different OSDs as needed.
 */
void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
{
	void *p, *end, *next;
	u32 nr_maps, maplen;
	u32 epoch;
	struct ceph_osdmap *newmap = NULL, *oldmap;
	int err;
	struct ceph_fsid fsid;

	dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
	p = msg->front.iov_base;
	end = p + msg->front.iov_len;

	/* verify fsid */
	ceph_decode_need(&p, end, sizeof(fsid), bad);
	ceph_decode_copy(&p, &fsid, sizeof(fsid));
1582 1583
	if (ceph_check_fsid(osdc->client, &fsid) < 0)
		return;
S
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1584 1585 1586 1587 1588 1589 1590 1591

	down_write(&osdc->map_sem);

	/* incremental maps */
	ceph_decode_32_safe(&p, end, nr_maps, bad);
	dout(" %d inc maps\n", nr_maps);
	while (nr_maps > 0) {
		ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1592 1593
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
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1594 1595 1596 1597 1598 1599 1600
		ceph_decode_need(&p, end, maplen, bad);
		next = p + maplen;
		if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
			dout("applying incremental map %u len %d\n",
			     epoch, maplen);
			newmap = osdmap_apply_incremental(&p, next,
							  osdc->osdmap,
1601
							  &osdc->client->msgr);
S
Sage Weil 已提交
1602 1603 1604 1605
			if (IS_ERR(newmap)) {
				err = PTR_ERR(newmap);
				goto bad;
			}
1606
			BUG_ON(!newmap);
S
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1607 1608 1609 1610
			if (newmap != osdc->osdmap) {
				ceph_osdmap_destroy(osdc->osdmap);
				osdc->osdmap = newmap;
			}
1611
			kick_requests(osdc, 0);
S
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1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626
		} else {
			dout("ignoring incremental map %u len %d\n",
			     epoch, maplen);
		}
		p = next;
		nr_maps--;
	}
	if (newmap)
		goto done;

	/* full maps */
	ceph_decode_32_safe(&p, end, nr_maps, bad);
	dout(" %d full maps\n", nr_maps);
	while (nr_maps) {
		ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1627 1628
		epoch = ceph_decode_32(&p);
		maplen = ceph_decode_32(&p);
S
Sage Weil 已提交
1629 1630 1631 1632 1633 1634 1635 1636 1637
		ceph_decode_need(&p, end, maplen, bad);
		if (nr_maps > 1) {
			dout("skipping non-latest full map %u len %d\n",
			     epoch, maplen);
		} else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
			dout("skipping full map %u len %d, "
			     "older than our %u\n", epoch, maplen,
			     osdc->osdmap->epoch);
		} else {
1638 1639
			int skipped_map = 0;

S
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1640 1641 1642 1643 1644 1645
			dout("taking full map %u len %d\n", epoch, maplen);
			newmap = osdmap_decode(&p, p+maplen);
			if (IS_ERR(newmap)) {
				err = PTR_ERR(newmap);
				goto bad;
			}
1646
			BUG_ON(!newmap);
S
Sage Weil 已提交
1647 1648
			oldmap = osdc->osdmap;
			osdc->osdmap = newmap;
1649 1650 1651
			if (oldmap) {
				if (oldmap->epoch + 1 < newmap->epoch)
					skipped_map = 1;
S
Sage Weil 已提交
1652
				ceph_osdmap_destroy(oldmap);
1653 1654
			}
			kick_requests(osdc, skipped_map);
S
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1655 1656 1657 1658 1659 1660 1661 1662
		}
		p += maplen;
		nr_maps--;
	}

done:
	downgrade_write(&osdc->map_sem);
	ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1663 1664 1665 1666 1667 1668 1669 1670 1671

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

A
Alex Elder 已提交
1672 1673 1674
	mutex_lock(&osdc->request_mutex);
	__send_queued(osdc);
	mutex_unlock(&osdc->request_mutex);
S
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1675
	up_read(&osdc->map_sem);
1676
	wake_up_all(&osdc->client->auth_wq);
S
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1677 1678 1679 1680
	return;

bad:
	pr_err("osdc handle_map corrupt msg\n");
1681
	ceph_msg_dump(msg);
S
Sage Weil 已提交
1682 1683 1684 1685
	up_write(&osdc->map_sem);
	return;
}

1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767
/*
 * watch/notify callback event infrastructure
 *
 * These callbacks are used both for watch and notify operations.
 */
static void __release_event(struct kref *kref)
{
	struct ceph_osd_event *event =
		container_of(kref, struct ceph_osd_event, kref);

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

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

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

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

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

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

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

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

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

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

int ceph_osdc_create_event(struct ceph_osd_client *osdc,
			   void (*event_cb)(u64, u64, u8, void *),
1768
			   void *data, struct ceph_osd_event **pevent)
1769 1770 1771 1772 1773 1774 1775 1776 1777
{
	struct ceph_osd_event *event;

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

	dout("create_event %p\n", event);
	event->cb = event_cb;
1778
	event->one_shot = 0;
1779 1780 1781
	event->data = data;
	event->osdc = osdc;
	INIT_LIST_HEAD(&event->osd_node);
1782
	RB_CLEAR_NODE(&event->node);
1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828
	kref_init(&event->kref);   /* one ref for us */
	kref_get(&event->kref);    /* one ref for the caller */

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

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

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

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


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

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


/*
 * Process osd watch notifications
 */
1829 1830
static void handle_watch_notify(struct ceph_osd_client *osdc,
				struct ceph_msg *msg)
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850
{
	void *p, *end;
	u8 proto_ver;
	u64 cookie, ver, notify_id;
	u8 opcode;
	struct ceph_osd_event *event;
	struct ceph_osd_event_work *event_work;

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

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

	spin_lock(&osdc->event_lock);
	event = __find_event(osdc, cookie);
	if (event) {
1851
		BUG_ON(event->one_shot);
1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862
		get_event(event);
	}
	spin_unlock(&osdc->event_lock);
	dout("handle_watch_notify cookie %lld ver %lld event %p\n",
	     cookie, ver, event);
	if (event) {
		event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
		if (!event_work) {
			dout("ERROR: could not allocate event_work\n");
			goto done_err;
		}
1863
		INIT_WORK(&event_work->work, do_event_work);
1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884
		event_work->event = event;
		event_work->ver = ver;
		event_work->notify_id = notify_id;
		event_work->opcode = opcode;
		if (!queue_work(osdc->notify_wq, &event_work->work)) {
			dout("WARNING: failed to queue notify event work\n");
			goto done_err;
		}
	}

	return;

done_err:
	ceph_osdc_put_event(event);
	return;

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

1885 1886
static void ceph_osdc_msg_data_set(struct ceph_msg *msg,
				struct ceph_osd_data *osd_data)
S
Sage Weil 已提交
1887
{
1888
	if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
1889
		BUG_ON(osd_data->length > (u64) SIZE_MAX);
1890
		if (osd_data->length)
1891 1892
			ceph_msg_data_set_pages(msg, osd_data->pages,
				osd_data->length, osd_data->alignment);
1893 1894 1895
	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
		BUG_ON(!osd_data->pagelist->length);
		ceph_msg_data_set_pagelist(msg, osd_data->pagelist);
1896
#ifdef CONFIG_BLOCK
1897
	} else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
1898
		ceph_msg_data_set_bio(msg, osd_data->bio);
1899
#endif
1900
	} else {
1901
		BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
1902
	}
1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917
}

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

	/* Set up response incoming data and request outgoing data fields */

	ceph_osdc_msg_data_set(req->r_reply, &req->r_data_in);
	ceph_osdc_msg_data_set(req->r_request, &req->r_data_out);
S
Sage Weil 已提交
1918 1919 1920

	down_read(&osdc->map_sem);
	mutex_lock(&osdc->request_mutex);
1921
	__register_request(osdc, req);
1922 1923 1924 1925 1926 1927 1928
	WARN_ON(req->r_sent);
	rc = __map_request(osdc, req, 0);
	if (rc < 0) {
		if (nofail) {
			dout("osdc_start_request failed map, "
				" will retry %lld\n", req->r_tid);
			rc = 0;
S
Sage Weil 已提交
1929
		}
1930
		goto out_unlock;
S
Sage Weil 已提交
1931
	}
1932 1933 1934 1935
	if (req->r_osd == NULL) {
		dout("send_request %p no up osds in pg\n", req);
		ceph_monc_request_next_osdmap(&osdc->client->monc);
	} else {
1936
		__send_queued(osdc);
1937 1938
	}
	rc = 0;
1939
out_unlock:
S
Sage Weil 已提交
1940 1941 1942 1943
	mutex_unlock(&osdc->request_mutex);
	up_read(&osdc->map_sem);
	return rc;
}
1944
EXPORT_SYMBOL(ceph_osdc_start_request);
S
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1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957

/*
 * wait for a request to complete
 */
int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
			   struct ceph_osd_request *req)
{
	int rc;

	rc = wait_for_completion_interruptible(&req->r_completion);
	if (rc < 0) {
		mutex_lock(&osdc->request_mutex);
		__cancel_request(req);
1958
		__unregister_request(osdc, req);
S
Sage Weil 已提交
1959
		mutex_unlock(&osdc->request_mutex);
S
Sage Weil 已提交
1960
		complete_request(req);
1961
		dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
S
Sage Weil 已提交
1962 1963 1964 1965 1966 1967
		return rc;
	}

	dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
	return req->r_result;
}
1968
EXPORT_SYMBOL(ceph_osdc_wait_request);
S
Sage Weil 已提交
1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001

/*
 * sync - wait for all in-flight requests to flush.  avoid starvation.
 */
void ceph_osdc_sync(struct ceph_osd_client *osdc)
{
	struct ceph_osd_request *req;
	u64 last_tid, next_tid = 0;

	mutex_lock(&osdc->request_mutex);
	last_tid = osdc->last_tid;
	while (1) {
		req = __lookup_request_ge(osdc, next_tid);
		if (!req)
			break;
		if (req->r_tid > last_tid)
			break;

		next_tid = req->r_tid + 1;
		if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
			continue;

		ceph_osdc_get_request(req);
		mutex_unlock(&osdc->request_mutex);
		dout("sync waiting on tid %llu (last is %llu)\n",
		     req->r_tid, last_tid);
		wait_for_completion(&req->r_safe_completion);
		mutex_lock(&osdc->request_mutex);
		ceph_osdc_put_request(req);
	}
	mutex_unlock(&osdc->request_mutex);
	dout("sync done (thru tid %llu)\n", last_tid);
}
2002
EXPORT_SYMBOL(ceph_osdc_sync);
S
Sage Weil 已提交
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019

/*
 * init, shutdown
 */
int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
{
	int err;

	dout("init\n");
	osdc->client = client;
	osdc->osdmap = NULL;
	init_rwsem(&osdc->map_sem);
	init_completion(&osdc->map_waiters);
	osdc->last_requested_map = 0;
	mutex_init(&osdc->request_mutex);
	osdc->last_tid = 0;
	osdc->osds = RB_ROOT;
2020
	INIT_LIST_HEAD(&osdc->osd_lru);
S
Sage Weil 已提交
2021
	osdc->requests = RB_ROOT;
2022
	INIT_LIST_HEAD(&osdc->req_lru);
2023 2024
	INIT_LIST_HEAD(&osdc->req_unsent);
	INIT_LIST_HEAD(&osdc->req_notarget);
2025
	INIT_LIST_HEAD(&osdc->req_linger);
S
Sage Weil 已提交
2026 2027
	osdc->num_requests = 0;
	INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2028
	INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2029 2030 2031
	spin_lock_init(&osdc->event_lock);
	osdc->event_tree = RB_ROOT;
	osdc->event_count = 0;
2032 2033

	schedule_delayed_work(&osdc->osds_timeout_work,
2034
	   round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
S
Sage Weil 已提交
2035

2036
	err = -ENOMEM;
S
Sage Weil 已提交
2037 2038 2039
	osdc->req_mempool = mempool_create_kmalloc_pool(10,
					sizeof(struct ceph_osd_request));
	if (!osdc->req_mempool)
2040
		goto out;
S
Sage Weil 已提交
2041

2042 2043
	err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
				OSD_OP_FRONT_LEN, 10, true,
2044
				"osd_op");
S
Sage Weil 已提交
2045
	if (err < 0)
2046
		goto out_mempool;
2047
	err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2048 2049
				OSD_OPREPLY_FRONT_LEN, 10, true,
				"osd_op_reply");
S
Sage Weil 已提交
2050 2051
	if (err < 0)
		goto out_msgpool;
2052 2053 2054 2055 2056 2057 2058

	osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
	if (IS_ERR(osdc->notify_wq)) {
		err = PTR_ERR(osdc->notify_wq);
		osdc->notify_wq = NULL;
		goto out_msgpool;
	}
S
Sage Weil 已提交
2059
	return 0;
2060

S
Sage Weil 已提交
2061 2062
out_msgpool:
	ceph_msgpool_destroy(&osdc->msgpool_op);
2063 2064 2065 2066
out_mempool:
	mempool_destroy(osdc->req_mempool);
out:
	return err;
S
Sage Weil 已提交
2067 2068 2069 2070
}

void ceph_osdc_stop(struct ceph_osd_client *osdc)
{
2071 2072
	flush_workqueue(osdc->notify_wq);
	destroy_workqueue(osdc->notify_wq);
S
Sage Weil 已提交
2073
	cancel_delayed_work_sync(&osdc->timeout_work);
2074
	cancel_delayed_work_sync(&osdc->osds_timeout_work);
S
Sage Weil 已提交
2075 2076 2077 2078
	if (osdc->osdmap) {
		ceph_osdmap_destroy(osdc->osdmap);
		osdc->osdmap = NULL;
	}
2079
	remove_all_osds(osdc);
S
Sage Weil 已提交
2080 2081
	mempool_destroy(osdc->req_mempool);
	ceph_msgpool_destroy(&osdc->msgpool_op);
S
Sage Weil 已提交
2082
	ceph_msgpool_destroy(&osdc->msgpool_op_reply);
S
Sage Weil 已提交
2083 2084 2085 2086 2087 2088 2089 2090 2091 2092
}

/*
 * 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,
2093
			struct page **pages, int num_pages, int page_align)
S
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2094 2095
{
	struct ceph_osd_request *req;
2096
	struct ceph_osd_data *osd_data;
S
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2097 2098 2099 2100 2101 2102 2103
	int rc = 0;

	dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
	     vino.snap, off, *plen);
	req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
				    CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
				    NULL, 0, truncate_seq, truncate_size, NULL,
2104
				    false);
2105 2106
	if (IS_ERR(req))
		return PTR_ERR(req);
S
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2107 2108

	/* it may be a short read due to an object boundary */
2109 2110 2111 2112

	osd_data = &req->r_data_in;
	osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
	osd_data->pages = pages;
2113
	osd_data->length = *plen;
2114
	osd_data->alignment = page_align;
S
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2115

2116 2117
	dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
	     off, *plen, osd_data->length, page_align);
S
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2118 2119 2120 2121 2122 2123 2124 2125 2126

	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;
}
2127
EXPORT_SYMBOL(ceph_osdc_readpages);
S
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2128 2129 2130 2131 2132 2133 2134 2135 2136 2137

/*
 * 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,
2138
			 struct page **pages, int num_pages)
S
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2139 2140
{
	struct ceph_osd_request *req;
2141
	struct ceph_osd_data *osd_data;
S
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2142
	int rc = 0;
2143
	int page_align = off & ~PAGE_MASK;
S
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2144 2145 2146 2147

	BUG_ON(vino.snap != CEPH_NOSNAP);
	req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
				    CEPH_OSD_OP_WRITE,
2148
				    CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2149
				    snapc, 0,
S
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				    truncate_seq, truncate_size, mtime,
2151
				    true);
2152 2153
	if (IS_ERR(req))
		return PTR_ERR(req);
S
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2154 2155

	/* it may be a short write due to an object boundary */
2156 2157 2158
	osd_data = &req->r_data_out;
	osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
	osd_data->pages = pages;
2159
	osd_data->length = len;
2160
	osd_data->alignment = page_align;
2161
	dout("writepages %llu~%llu (%llu bytes)\n", off, len, osd_data->length);
S
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2162

2163
	rc = ceph_osdc_start_request(osdc, req, true);
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2164 2165 2166 2167 2168 2169 2170 2171 2172
	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;
}
2173
EXPORT_SYMBOL(ceph_osdc_writepages);
S
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2174 2175 2176 2177 2178 2179 2180

/*
 * handle incoming message
 */
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
{
	struct ceph_osd *osd = con->private;
2181
	struct ceph_osd_client *osdc;
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2182 2183 2184
	int type = le16_to_cpu(msg->hdr.type);

	if (!osd)
S
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2185
		goto out;
2186
	osdc = osd->o_osdc;
S
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2187 2188 2189 2190 2191 2192

	switch (type) {
	case CEPH_MSG_OSD_MAP:
		ceph_osdc_handle_map(osdc, msg);
		break;
	case CEPH_MSG_OSD_OPREPLY:
2193
		handle_reply(osdc, msg, con);
S
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2194
		break;
2195 2196 2197
	case CEPH_MSG_WATCH_NOTIFY:
		handle_watch_notify(osdc, msg);
		break;
S
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2198 2199 2200 2201 2202

	default:
		pr_err("received unknown message type %d %s\n", type,
		       ceph_msg_type_name(type));
	}
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out:
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2204 2205 2206
	ceph_msg_put(msg);
}

2207
/*
2208 2209
 * lookup and return message for incoming reply.  set up reply message
 * pages.
2210 2211
 */
static struct ceph_msg *get_reply(struct ceph_connection *con,
2212 2213
				  struct ceph_msg_header *hdr,
				  int *skip)
S
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2214 2215 2216
{
	struct ceph_osd *osd = con->private;
	struct ceph_osd_client *osdc = osd->o_osdc;
2217
	struct ceph_msg *m;
2218
	struct ceph_osd_request *req;
2219 2220
	int front = le32_to_cpu(hdr->front_len);
	int data_len = le32_to_cpu(hdr->data_len);
2221
	u64 tid;
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2222

2223 2224 2225 2226 2227 2228
	tid = le64_to_cpu(hdr->tid);
	mutex_lock(&osdc->request_mutex);
	req = __lookup_request(osdc, tid);
	if (!req) {
		*skip = 1;
		m = NULL;
2229 2230
		dout("get_reply unknown tid %llu from osd%d\n", tid,
		     osd->o_osd);
2231 2232
		goto out;
	}
S
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2233 2234

	if (req->r_con_filling_msg) {
2235
		dout("%s revoking msg %p from old con %p\n", __func__,
S
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2236
		     req->r_reply, req->r_con_filling_msg);
2237
		ceph_msg_revoke_incoming(req->r_reply);
2238
		req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
2239
		req->r_con_filling_msg = NULL;
2240 2241
	}

S
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	if (front > req->r_reply->front.iov_len) {
		pr_warning("get_reply front %d > preallocated %d\n",
			   front, (int)req->r_reply->front.iov_len);
2245
		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2246
		if (!m)
S
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2247 2248 2249 2250 2251 2252
			goto out;
		ceph_msg_put(req->r_reply);
		req->r_reply = m;
	}
	m = ceph_msg_get(req->r_reply);

2253
	if (data_len > 0) {
2254 2255 2256 2257
		struct ceph_osd_data *osd_data = &req->r_data_in;

		if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
			if (osd_data->pages &&
2258
				unlikely(osd_data->length < data_len)) {
2259

2260 2261 2262
				pr_warning("tid %lld reply has %d bytes "
					"we had only %llu bytes ready\n",
					tid, data_len, osd_data->length);
2263 2264 2265 2266 2267 2268
				*skip = 1;
				ceph_msg_put(m);
				m = NULL;
				goto out;
			}
		}
2269
	}
2270
	*skip = 0;
2271
	req->r_con_filling_msg = con->ops->get(con);
S
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2272
	dout("get_reply tid %lld %p\n", tid, m);
2273 2274 2275

out:
	mutex_unlock(&osdc->request_mutex);
2276
	return m;
2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287

}

static struct ceph_msg *alloc_msg(struct ceph_connection *con,
				  struct ceph_msg_header *hdr,
				  int *skip)
{
	struct ceph_osd *osd = con->private;
	int type = le16_to_cpu(hdr->type);
	int front = le32_to_cpu(hdr->front_len);

A
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2288
	*skip = 0;
2289 2290
	switch (type) {
	case CEPH_MSG_OSD_MAP:
2291
	case CEPH_MSG_WATCH_NOTIFY:
2292
		return ceph_msg_new(type, front, GFP_NOFS, false);
2293 2294 2295 2296 2297 2298 2299 2300
	case CEPH_MSG_OSD_OPREPLY:
		return get_reply(con, hdr, skip);
	default:
		pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
			osd->o_osd);
		*skip = 1;
		return NULL;
	}
S
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2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319
}

/*
 * 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);
}

2320 2321 2322
/*
 * authentication
 */
2323 2324 2325 2326 2327
/*
 * 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,
2328
					int *proto, int force_new)
2329 2330 2331 2332
{
	struct ceph_osd *o = con->private;
	struct ceph_osd_client *osdc = o->o_osdc;
	struct ceph_auth_client *ac = osdc->client->monc.auth;
2333
	struct ceph_auth_handshake *auth = &o->o_auth;
2334

2335
	if (force_new && auth->authorizer) {
2336
		ceph_auth_destroy_authorizer(ac, auth->authorizer);
2337 2338
		auth->authorizer = NULL;
	}
2339 2340 2341
	if (!auth->authorizer) {
		int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
						      auth);
2342
		if (ret)
2343
			return ERR_PTR(ret);
2344 2345
	} else {
		int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2346 2347 2348
						     auth);
		if (ret)
			return ERR_PTR(ret);
2349 2350
	}
	*proto = ac->protocol;
2351

2352
	return auth;
2353 2354 2355 2356 2357 2358 2359 2360 2361
}


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

2362
	return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2363 2364
}

2365 2366 2367 2368 2369 2370
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;

2371
	ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2372 2373
	return ceph_monc_validate_auth(&osdc->client->monc);
}
2374

2375
static const struct ceph_connection_operations osd_con_ops = {
S
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2376 2377 2378
	.get = get_osd_con,
	.put = put_osd_con,
	.dispatch = dispatch,
2379 2380
	.get_authorizer = get_authorizer,
	.verify_authorizer_reply = verify_authorizer_reply,
2381
	.invalidate_authorizer = invalidate_authorizer,
S
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2382
	.alloc_msg = alloc_msg,
2383
	.fault = osd_reset,
S
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2384
};