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Date: Wed, 5 Aug 2009 15:30:30 -0700
From: Sage Weil <sage@...dream.net>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Sage Weil <sage@...dream.net>
Subject: [PATCH 10/19] ceph: OSD client
The OSD client is responsible for reading and writing data from/to the
object storage pool. This includes determining where objects are
stored in the cluster, and ensuring that requests are retried or
redirected in the event of a node failure or data migration.
If an OSD does not respond before a timeout expires, keepalive
messages are sent across the lossless, ordered communications channel
to ensure that any break in the TCP is discovered. If the session
does reset, a reconnection is attempted and affected requests are
resent (by the message transport layer).
Signed-off-by: Sage Weil <sage@...dream.net>
---
fs/ceph/osd_client.c | 1096 ++++++++++++++++++++++++++++++++++++++++++++++++++
fs/ceph/osd_client.h | 136 +++++++
fs/ceph/osdmap.c | 697 ++++++++++++++++++++++++++++++++
fs/ceph/osdmap.h | 83 ++++
4 files changed, 2012 insertions(+), 0 deletions(-)
create mode 100644 fs/ceph/osd_client.c
create mode 100644 fs/ceph/osd_client.h
create mode 100644 fs/ceph/osdmap.c
create mode 100644 fs/ceph/osdmap.h
diff --git a/fs/ceph/osd_client.c b/fs/ceph/osd_client.c
new file mode 100644
index 0000000..4f819c9
--- /dev/null
+++ b/fs/ceph/osd_client.c
@@ -0,0 +1,1096 @@
+#include <linux/err.h>
+#include <linux/highmem.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include "ceph_debug.h"
+#include "super.h"
+#include "osd_client.h"
+#include "messenger.h"
+#include "crush/mapper.h"
+#include "decode.h"
+
+/*
+ * Implement client access to distributed object storage cluster.
+ *
+ * All data objects are stored within a cluster/cloud of OSDs, or
+ * "object storage devices." (Note that Ceph OSDs have _nothing_ to
+ * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply
+ * remote daemons serving up and coordinating consistent and safe
+ * access to storage.
+ *
+ * Cluster membership and the mapping of data objects onto storage devices
+ * are described by the osd map.
+ *
+ * We keep track of pending OSD requests (read, write), resubmit
+ * requests to different OSDs when the cluster topology/data layout
+ * change, or retry the affected requests when the communications
+ * channel with an OSD is reset.
+ */
+
+/*
+ * calculate the mapping of a file extent onto an object, and fill out the
+ * request accordingly. shorten extent as necessary if it crosses an
+ * object boundary.
+ *
+ * fill osd op in request message.
+ */
+static void calc_layout(struct ceph_osd_client *osdc,
+ struct ceph_vino vino, struct ceph_file_layout *layout,
+ u64 off, u64 *plen,
+ struct ceph_osd_request *req)
+{
+ struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
+ struct ceph_osd_op *op = (void *)(reqhead + 1);
+ u64 orig_len = *plen;
+ u64 objoff, objlen; /* extent in object */
+ u64 bno;
+
+ reqhead->snapid = cpu_to_le64(vino.snap);
+
+ /* object extent? */
+ ceph_calc_file_object_mapping(layout, off, plen, &bno,
+ &objoff, &objlen);
+ if (*plen < orig_len)
+ dout(" skipping last %llu, final file extent %llu~%llu\n",
+ orig_len - *plen, off, *plen);
+
+ sprintf(req->r_oid, "%llx.%08llx", vino.ino, bno);
+ req->r_oid_len = strlen(req->r_oid);
+
+ op->offset = cpu_to_le64(objoff);
+ op->length = cpu_to_le64(objlen);
+ req->r_num_pages = calc_pages_for(off, *plen);
+
+ dout("calc_layout %s (%d) %llu~%llu (%d pages)\n",
+ req->r_oid, req->r_oid_len, objoff, objlen, req->r_num_pages);
+}
+
+
+/*
+ * requests
+ */
+void ceph_osdc_put_request(struct ceph_osd_request *req)
+{
+ dout("osdc put_request %p %d -> %d\n", req, atomic_read(&req->r_ref),
+ atomic_read(&req->r_ref)-1);
+ BUG_ON(atomic_read(&req->r_ref) <= 0);
+ if (atomic_dec_and_test(&req->r_ref)) {
+ if (req->r_request)
+ ceph_msg_put(req->r_request);
+ if (req->r_reply)
+ ceph_msg_put(req->r_reply);
+ if (req->r_own_pages)
+ ceph_release_page_vector(req->r_pages,
+ req->r_num_pages);
+ ceph_put_snap_context(req->r_snapc);
+ if (req->r_mempool)
+ mempool_free(req, req->r_osdc->req_mempool);
+ else
+ kfree(req);
+ }
+}
+
+/*
+ * 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,
+ bool use_mempool)
+{
+ struct ceph_osd_request *req;
+ struct ceph_msg *msg;
+ struct ceph_osd_request_head *head;
+ struct ceph_osd_op *op;
+ void *p;
+ int do_trunc = truncate_seq && (off + *plen > truncate_size);
+ int num_op = 1 + do_sync + do_trunc;
+ size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
+ int i;
+ u64 prevofs;
+
+ if (use_mempool) {
+ req = mempool_alloc(osdc->req_mempool, GFP_NOFS);
+ memset(req, 0, sizeof(*req));
+ } else {
+ req = kzalloc(sizeof(*req), GFP_NOFS);
+ }
+ if (req == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ req->r_osdc = osdc;
+ req->r_mempool = use_mempool;
+ atomic_set(&req->r_ref, 1);
+ init_completion(&req->r_completion);
+ init_completion(&req->r_safe_completion);
+ INIT_LIST_HEAD(&req->r_unsafe_item);
+ req->r_flags = flags;
+ req->r_last_osd = -1;
+
+ WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
+
+ /* create message; allow space for oid */
+ msg_size += 40 + osdc->client->signed_ticket_len;
+ if (snapc)
+ msg_size += sizeof(u64) * snapc->num_snaps;
+ msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, 0, 0, NULL);
+ if (IS_ERR(msg)) {
+ kfree(req);
+ return ERR_PTR(PTR_ERR(msg));
+ }
+ memset(msg->front.iov_base, 0, msg->front.iov_len);
+ head = msg->front.iov_base;
+ op = (void *)(head + 1);
+ p = (void *)(op + num_op);
+
+ req->r_request = msg;
+ req->r_snapc = ceph_get_snap_context(snapc);
+
+ head->client_inc = cpu_to_le32(1); /* always, for now. */
+ head->flags = cpu_to_le32(flags);
+ if (flags & CEPH_OSD_FLAG_WRITE)
+ ceph_encode_timespec(&head->mtime, mtime);
+ head->num_ops = cpu_to_le16(num_op);
+ op->op = cpu_to_le16(opcode);
+
+ /* calculate max write size */
+ calc_layout(osdc, vino, layout, off, plen, req);
+ req->r_file_layout = *layout; /* keep a copy */
+
+ if (flags & CEPH_OSD_FLAG_WRITE) {
+ req->r_request->hdr.data_off = cpu_to_le16(off);
+ req->r_request->hdr.data_len = cpu_to_le32(*plen);
+ op->payload_len = cpu_to_le32(*plen);
+ }
+
+ /* fill in oid, ticket */
+ head->object_len = cpu_to_le32(req->r_oid_len);
+ memcpy(p, req->r_oid, req->r_oid_len);
+ p += req->r_oid_len;
+
+ head->ticket_len = cpu_to_le32(osdc->client->signed_ticket_len);
+ memcpy(p, osdc->client->signed_ticket,
+ osdc->client->signed_ticket_len);
+ p += osdc->client->signed_ticket_len;
+
+ /* additional ops */
+ if (do_trunc) {
+ op++;
+ op->op = cpu_to_le16(opcode == CEPH_OSD_OP_READ ?
+ CEPH_OSD_OP_MASKTRUNC : CEPH_OSD_OP_SETTRUNC);
+ op->truncate_seq = cpu_to_le32(truncate_seq);
+ prevofs = le64_to_cpu((op-1)->offset);
+ op->truncate_size = cpu_to_le64(truncate_size - (off-prevofs));
+ }
+ if (do_sync) {
+ op++;
+ op->op = cpu_to_le16(CEPH_OSD_OP_STARTSYNC);
+ }
+ if (snapc) {
+ head->snap_seq = cpu_to_le64(snapc->seq);
+ head->num_snaps = cpu_to_le32(snapc->num_snaps);
+ for (i = 0; i < snapc->num_snaps; i++) {
+ put_unaligned_le64(snapc->snaps[i], p);
+ p += sizeof(u64);
+ }
+ }
+
+ BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
+ return req;
+}
+
+/*
+ * 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;
+}
+
+/*
+ * Register request, assign tid. If this is the first request, set up
+ * the timeout event.
+ */
+static void register_request(struct ceph_osd_client *osdc,
+ struct ceph_osd_request *req)
+{
+ struct ceph_osd_request_head *head = req->r_request->front.iov_base;
+
+ mutex_lock(&osdc->request_mutex);
+ req->r_tid = ++osdc->last_tid;
+ head->tid = cpu_to_le64(req->r_tid);
+
+ dout("register_request %p tid %lld\n", req, req->r_tid);
+ __insert_request(osdc, req);
+ ceph_osdc_get_request(req);
+ osdc->num_requests++;
+
+ req->r_timeout_stamp =
+ jiffies + osdc->client->mount_args.osd_timeout*HZ;
+
+ if (osdc->num_requests == 1) {
+ osdc->timeout_tid = req->r_tid;
+ dout(" timeout on tid %llu at %lu\n", req->r_tid,
+ req->r_timeout_stamp);
+ schedule_delayed_work(&osdc->timeout_work,
+ round_jiffies_relative(req->r_timeout_stamp - jiffies));
+ }
+ mutex_unlock(&osdc->request_mutex);
+}
+
+/*
+ * called under osdc->request_mutex
+ */
+static void __unregister_request(struct ceph_osd_client *osdc,
+ struct ceph_osd_request *req)
+{
+ dout("__unregister_request %p tid %lld\n", req, req->r_tid);
+ rb_erase(&req->r_node, &osdc->requests);
+ osdc->num_requests--;
+ ceph_osdc_put_request(req);
+
+ if (req->r_tid == osdc->timeout_tid) {
+ if (osdc->num_requests == 0) {
+ dout("no requests, canceling timeout\n");
+ osdc->timeout_tid = 0;
+ cancel_delayed_work(&osdc->timeout_work);
+ } else {
+ req = rb_entry(rb_first(&osdc->requests),
+ struct ceph_osd_request, r_node);
+ osdc->timeout_tid = req->r_tid;
+ dout("rescheduled timeout on tid %llu at %lu\n",
+ req->r_tid, req->r_timeout_stamp);
+ schedule_delayed_work(&osdc->timeout_work,
+ round_jiffies_relative(req->r_timeout_stamp -
+ jiffies));
+ }
+ }
+}
+
+/*
+ * Pick an osd (the first 'up' osd in the pg), and put result in
+ * req->r_last_osd[_addr]. If none, set to -1.
+ *
+ * Caller should hold map_sem for read.
+ *
+ * return 0 if unchanged, 1 if changed.
+ */
+static int map_osds(struct ceph_osd_client *osdc,
+ struct ceph_osd_request *req)
+{
+ struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
+ union ceph_pg pgid;
+ struct ceph_pg_pool_info *pool;
+ int ruleno;
+ unsigned pps; /* placement ps */
+ int osds[10], osd = -1;
+ int i, num;
+ int err;
+
+ err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
+ &req->r_file_layout, osdc->osdmap);
+ if (err)
+ return err;
+ pgid.pg64 = le64_to_cpu(reqhead->layout.ol_pgid);
+ if (pgid.pg.pool >= osdc->osdmap->num_pools)
+ return -1;
+ pool = &osdc->osdmap->pg_pool[pgid.pg.pool];
+ ruleno = crush_find_rule(osdc->osdmap->crush, pool->v.crush_ruleset,
+ pool->v.type, pool->v.size);
+ if (ruleno < 0) {
+ pr_err("ceph map_osds no crush rule pool %d type %d size %d\n",
+ pgid.pg.pool, pool->v.type, pool->v.size);
+ return -1;
+ }
+
+ if (pgid.pg.preferred >= 0)
+ pps = ceph_stable_mod(pgid.pg.ps,
+ le32_to_cpu(pool->v.lpgp_num),
+ pool->lpgp_num_mask);
+ else
+ pps = ceph_stable_mod(pgid.pg.ps,
+ le32_to_cpu(pool->v.pgp_num),
+ pool->pgp_num_mask);
+ pps += pgid.pg.pool;
+ num = crush_do_rule(osdc->osdmap->crush, ruleno, pps, osds,
+ min_t(int, pool->v.size, ARRAY_SIZE(osds)),
+ pgid.pg.preferred, osdc->osdmap->osd_weight);
+
+ /* primary is first up osd */
+ for (i = 0; i < num; i++)
+ if (ceph_osd_is_up(osdc->osdmap, osds[i])) {
+ osd = osds[i];
+ break;
+ }
+ dout("map_osds tid %llu pgid %llx pool %d osd%d (was osd%d)\n",
+ req->r_tid, pgid.pg64, pgid.pg.pool, osd, req->r_last_osd);
+ if (req->r_last_osd == osd &&
+ (osd < 0 || ceph_entity_addr_equal(&osdc->osdmap->osd_addr[osd],
+ &req->r_last_osd_addr)))
+ return 0;
+ req->r_last_osd = osd;
+ if (osd >= 0)
+ req->r_last_osd_addr = osdc->osdmap->osd_addr[osd];
+ return 1;
+}
+
+/*
+ * caller should hold map_sem (for read)
+ */
+static int send_request(struct ceph_osd_client *osdc,
+ struct ceph_osd_request *req)
+{
+ struct ceph_osd_request_head *reqhead;
+ int osd;
+
+ map_osds(osdc, req);
+ if (req->r_last_osd < 0) {
+ dout("send_request %p no up osds in pg\n", req);
+ ceph_monc_request_osdmap(&osdc->client->monc,
+ osdc->osdmap->epoch+1);
+ return 0;
+ }
+ osd = req->r_last_osd;
+
+ dout("send_request %p tid %llu to osd%d flags %d\n",
+ req, req->r_tid, osd, req->r_flags);
+
+ reqhead = req->r_request->front.iov_base;
+ reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
+ reqhead->flags |= cpu_to_le32(req->r_flags); /* e.g., RETRY */
+ reqhead->reassert_version = req->r_reassert_version;
+
+ req->r_request->hdr.dst.name.type =
+ cpu_to_le32(CEPH_ENTITY_TYPE_OSD);
+ req->r_request->hdr.dst.name.num = cpu_to_le32(osd);
+ req->r_request->hdr.dst.addr = req->r_last_osd_addr;
+
+ req->r_timeout_stamp = jiffies+osdc->client->mount_args.osd_timeout*HZ;
+
+ ceph_msg_get(req->r_request); /* send consumes a ref */
+ return ceph_msg_send(osdc->client->msgr, req->r_request,
+ BASE_DELAY_INTERVAL);
+}
+
+/*
+ * 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);
+ struct ceph_osd_request *req;
+ unsigned long timeout = osdc->client->mount_args.osd_timeout * HZ;
+ unsigned long next_timeout = timeout + jiffies;
+ RADIX_TREE(pings, GFP_NOFS); /* only send 1 ping per osd */
+ struct rb_node *p;
+
+ dout("timeout\n");
+ down_read(&osdc->map_sem);
+
+ ceph_monc_request_osdmap(&osdc->client->monc, osdc->osdmap->epoch+1);
+
+ mutex_lock(&osdc->request_mutex);
+ for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
+ req = rb_entry(p, struct ceph_osd_request, r_node);
+
+ if (req->r_resend) {
+ int err;
+
+ dout("osdc resending prev failed %lld\n", req->r_tid);
+ err = send_request(osdc, req);
+ if (err)
+ dout("osdc failed again on %lld\n", req->r_tid);
+ else
+ req->r_resend = false;
+ continue;
+ }
+
+ if (time_before(jiffies, req->r_timeout_stamp))
+ continue;
+
+ req->r_timeout_stamp = next_timeout;
+ if (req->r_last_osd >= 0 &&
+ radix_tree_lookup(&pings, req->r_last_osd) == NULL) {
+ struct ceph_entity_name n = {
+ .type = cpu_to_le32(CEPH_ENTITY_TYPE_OSD),
+ .num = cpu_to_le32(req->r_last_osd)
+ };
+ dout(" tid %llu (at least) timed out on osd%d\n",
+ req->r_tid, req->r_last_osd);
+ radix_tree_insert(&pings, req->r_last_osd, req);
+ ceph_ping(osdc->client->msgr, n, &req->r_last_osd_addr);
+ }
+ }
+
+ while (radix_tree_gang_lookup(&pings, (void **)&req, 0, 1))
+ radix_tree_delete(&pings, req->r_last_osd);
+
+ if (osdc->timeout_tid)
+ schedule_delayed_work(&osdc->timeout_work,
+ round_jiffies_relative(timeout));
+
+ mutex_unlock(&osdc->request_mutex);
+
+ up_read(&osdc->map_sem);
+}
+
+/*
+ * handle osd op reply. either call the callback if it is specified,
+ * or do the completion to wake up the waiting thread.
+ */
+void ceph_osdc_handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg)
+{
+ struct ceph_osd_reply_head *rhead = msg->front.iov_base;
+ struct ceph_osd_request *req;
+ u64 tid;
+ int numops, object_len, flags;
+
+ if (msg->front.iov_len < sizeof(*rhead))
+ goto bad;
+ tid = le64_to_cpu(rhead->tid);
+ numops = le32_to_cpu(rhead->num_ops);
+ object_len = le32_to_cpu(rhead->object_len);
+ if (msg->front.iov_len != sizeof(*rhead) + object_len +
+ numops * sizeof(struct ceph_osd_op))
+ goto bad;
+ dout("handle_reply %p tid %llu\n", msg, tid);
+
+ /* lookup */
+ mutex_lock(&osdc->request_mutex);
+ req = __lookup_request(osdc, tid);
+ if (req == NULL) {
+ dout("handle_reply tid %llu dne\n", tid);
+ mutex_unlock(&osdc->request_mutex);
+ return;
+ }
+ ceph_osdc_get_request(req);
+ flags = le32_to_cpu(rhead->flags);
+
+ if (req->r_aborted) {
+ dout("handle_reply tid %llu aborted\n", tid);
+ goto done;
+ }
+
+ if (req->r_reassert_version.epoch == 0) {
+ /* first ack */
+ if (req->r_reply == NULL) {
+ /* no data payload, or r_reply would have been set by
+ prepare_pages. */
+ ceph_msg_get(msg);
+ req->r_reply = msg;
+ } else {
+ /* r_reply was set by prepare_pages */
+ BUG_ON(req->r_reply != msg);
+ }
+
+ /* in case we need to replay this op, */
+ req->r_reassert_version = rhead->reassert_version;
+ } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
+ dout("handle_reply tid %llu dup ack\n", tid);
+ goto done;
+ }
+
+ dout("handle_reply tid %llu flags %d\n", tid, flags);
+
+ /* either this is a read, or we got the safe response */
+ if ((flags & CEPH_OSD_FLAG_ONDISK) ||
+ ((flags & CEPH_OSD_FLAG_WRITE) == 0))
+ __unregister_request(osdc, req);
+
+ mutex_unlock(&osdc->request_mutex);
+
+ if (req->r_callback)
+ req->r_callback(req);
+ else
+ complete(&req->r_completion);
+
+ if (flags & CEPH_OSD_FLAG_ONDISK) {
+ if (req->r_safe_callback)
+ req->r_safe_callback(req);
+ complete(&req->r_safe_completion); /* fsync waiter */
+ }
+
+done:
+ ceph_osdc_put_request(req);
+ return;
+
+bad:
+ pr_err("ceph corrupt osd_op_reply got %d %d expected %d\n",
+ (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
+ (int)sizeof(*rhead));
+}
+
+
+/*
+ * Resubmit osd requests whose osd or osd address has changed. Request
+ * a new osd map if osds are down, or we are otherwise unable to determine
+ * how to direct a request.
+ *
+ * If @who is specified, resubmit requests for that specific osd.
+ *
+ * Caller should hold map_sem for read.
+ */
+static void kick_requests(struct ceph_osd_client *osdc,
+ struct ceph_entity_addr *who)
+{
+ struct ceph_osd_request *req;
+ struct rb_node *p;
+ int needmap = 0;
+ int err;
+
+ mutex_lock(&osdc->request_mutex);
+ for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
+ req = rb_entry(p, struct ceph_osd_request, r_node);
+
+ if (req->r_resend)
+ goto kick;
+ if (who && ceph_entity_addr_equal(who, &req->r_last_osd_addr))
+ goto kick;
+
+ if (map_osds(osdc, req) == 0)
+ continue; /* no change */
+
+ if (req->r_last_osd < 0) {
+ dout("tid %llu maps to no valid osd\n", req->r_tid);
+ needmap++; /* request a newer map */
+ memset(&req->r_last_osd_addr, 0,
+ sizeof(req->r_last_osd_addr));
+ continue;
+ }
+
+ kick:
+ dout("kicking tid %llu osd%d\n", req->r_tid,
+ req->r_last_osd);
+ ceph_osdc_get_request(req);
+ mutex_unlock(&osdc->request_mutex);
+ req->r_request = ceph_msg_maybe_dup(req->r_request);
+ if (!req->r_aborted) {
+ req->r_flags |= CEPH_OSD_FLAG_RETRY;
+ err = send_request(osdc, req);
+ if (err)
+ req->r_resend = true;
+ }
+ ceph_osdc_put_request(req);
+ mutex_lock(&osdc->request_mutex);
+ }
+ mutex_unlock(&osdc->request_mutex);
+
+ if (needmap) {
+ dout("%d requests for down osds, need new map\n", needmap);
+ ceph_monc_request_osdmap(&osdc->client->monc,
+ osdc->osdmap->epoch+1);
+ }
+}
+
+/*
+ * 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;
+ ceph_fsid_t 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));
+ if (ceph_fsid_compare(&fsid, &osdc->client->monc.monmap->fsid)) {
+ pr_err("ceph got osdmap with wrong fsid, ignoring\n");
+ return;
+ }
+
+ 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);
+ ceph_decode_32(&p, epoch);
+ ceph_decode_32(&p, maplen);
+ 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 = apply_incremental(&p, next, osdc->osdmap,
+ osdc->client->msgr);
+ if (IS_ERR(newmap)) {
+ err = PTR_ERR(newmap);
+ goto bad;
+ }
+ if (newmap != osdc->osdmap) {
+ ceph_osdmap_destroy(osdc->osdmap);
+ osdc->osdmap = newmap;
+ }
+ } else {
+ dout("ignoring incremental map %u len %d\n",
+ epoch, maplen);
+ }
+ p = next;
+ nr_maps--;
+ }
+ if (newmap)
+ goto done;
+
+ /* full maps */
+ ceph_decode_32_safe(&p, end, nr_maps, bad);
+ dout(" %d full maps\n", nr_maps);
+ while (nr_maps) {
+ ceph_decode_need(&p, end, 2*sizeof(u32), bad);
+ ceph_decode_32(&p, epoch);
+ ceph_decode_32(&p, maplen);
+ ceph_decode_need(&p, end, maplen, bad);
+ if (nr_maps > 1) {
+ dout("skipping non-latest full map %u len %d\n",
+ epoch, maplen);
+ } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
+ dout("skipping full map %u len %d, "
+ "older than our %u\n", epoch, maplen,
+ osdc->osdmap->epoch);
+ } else {
+ dout("taking full map %u len %d\n", epoch, maplen);
+ newmap = osdmap_decode(&p, p+maplen);
+ if (IS_ERR(newmap)) {
+ err = PTR_ERR(newmap);
+ goto bad;
+ }
+ oldmap = osdc->osdmap;
+ osdc->osdmap = newmap;
+ if (oldmap)
+ ceph_osdmap_destroy(oldmap);
+ }
+ p += maplen;
+ nr_maps--;
+ }
+
+done:
+ downgrade_write(&osdc->map_sem);
+ ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
+ if (newmap)
+ kick_requests(osdc, NULL);
+ up_read(&osdc->map_sem);
+ return;
+
+bad:
+ pr_err("ceph osdc handle_map corrupt msg\n");
+ up_write(&osdc->map_sem);
+ return;
+}
+
+/*
+ * If we detect that a tcp connection to an osd resets, we need to
+ * resubmit all requests for that osd. That's because although we reliably
+ * deliver our requests, the osd doesn't not try as hard to deliver the
+ * reply (because it does not get notification when clients, mds' leave
+ * the cluster).
+ */
+void ceph_osdc_handle_reset(struct ceph_osd_client *osdc,
+ struct ceph_entity_addr *addr)
+{
+ down_read(&osdc->map_sem);
+ kick_requests(osdc, addr);
+ up_read(&osdc->map_sem);
+}
+
+
+/*
+ * A read request prepares specific pages that data is to be read into.
+ * When a message is being read off the wire, we call prepare_pages to
+ * find those pages.
+ * 0 = success, -1 failure.
+ */
+int ceph_osdc_prepare_pages(void *p, struct ceph_msg *m, int want)
+{
+ struct ceph_client *client = p;
+ struct ceph_osd_client *osdc = &client->osdc;
+ struct ceph_osd_reply_head *rhead = m->front.iov_base;
+ struct ceph_osd_request *req;
+ u64 tid;
+ int ret = -1;
+ int type = le16_to_cpu(m->hdr.type);
+
+ dout("prepare_pages on msg %p want %d\n", m, want);
+ if (unlikely(type != CEPH_MSG_OSD_OPREPLY))
+ return -1; /* hmm! */
+
+ tid = le64_to_cpu(rhead->tid);
+ mutex_lock(&osdc->request_mutex);
+ req = __lookup_request(osdc, tid);
+ if (!req) {
+ dout("prepare_pages unknown tid %llu\n", tid);
+ goto out;
+ }
+ dout("prepare_pages tid %llu has %d pages, want %d\n",
+ tid, req->r_num_pages, want);
+ if (likely(req->r_num_pages >= want && req->r_reply == NULL &&
+ !req->r_aborted)) {
+ m->pages = req->r_pages;
+ m->nr_pages = req->r_num_pages;
+ ceph_msg_get(m);
+ req->r_reply = m;
+ ret = 0; /* success */
+ }
+out:
+ mutex_unlock(&osdc->request_mutex);
+ return ret;
+}
+
+/*
+ * Register request, send initial attempt.
+ */
+int ceph_osdc_start_request(struct ceph_osd_client *osdc,
+ struct ceph_osd_request *req,
+ bool nofail)
+{
+ int rc;
+
+ req->r_request->pages = req->r_pages;
+ req->r_request->nr_pages = req->r_num_pages;
+
+ register_request(osdc, req);
+
+ down_read(&osdc->map_sem);
+ rc = send_request(osdc, req);
+ up_read(&osdc->map_sem);
+ if (rc) {
+ if (nofail) {
+ dout("osdc_start_request failed send, marking %lld\n",
+ req->r_tid);
+ req->r_resend = true;
+ rc = 0;
+ } else {
+ mutex_lock(&osdc->request_mutex);
+ __unregister_request(osdc, req);
+ mutex_unlock(&osdc->request_mutex);
+ }
+ }
+ return rc;
+}
+
+/*
+ * wait for a request to complete
+ */
+int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
+ struct ceph_osd_request *req)
+{
+ struct ceph_osd_reply_head *replyhead;
+ __s32 rc;
+ int bytes;
+
+ rc = wait_for_completion_interruptible(&req->r_completion);
+ if (rc < 0) {
+ ceph_osdc_abort_request(osdc, req);
+ return rc;
+ }
+
+ /* parse reply */
+ replyhead = req->r_reply->front.iov_base;
+ rc = le32_to_cpu(replyhead->result);
+ bytes = le32_to_cpu(req->r_reply->hdr.data_len);
+ dout("wait_request tid %llu result %d, %d bytes\n",
+ req->r_tid, rc, bytes);
+ if (rc < 0)
+ return rc;
+ return bytes;
+}
+
+/*
+ * To abort an in-progress request, take pages away from outgoing or
+ * incoming message.
+ */
+void ceph_osdc_abort_request(struct ceph_osd_client *osdc,
+ struct ceph_osd_request *req)
+{
+ struct ceph_msg *msg;
+
+ dout("abort_request tid %llu, revoking %p pages\n", req->r_tid,
+ req->r_request);
+ /*
+ * mark req aborted _before_ revoking pages, so that
+ * if a racing kick_request _does_ dup the page vec
+ * pointer, it will definitely then see the aborted
+ * flag and not send the request.
+ */
+ req->r_aborted = 1;
+ msg = req->r_request;
+ mutex_lock(&msg->page_mutex);
+ msg->pages = NULL;
+ mutex_unlock(&msg->page_mutex);
+ if (req->r_reply) {
+ mutex_lock(&req->r_reply->page_mutex);
+ req->r_reply->pages = NULL;
+ mutex_unlock(&req->r_reply->page_mutex);
+ }
+}
+
+/*
+ * 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);
+}
+
+/*
+ * init, shutdown
+ */
+int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
+{
+ 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->timeout_tid = 0;
+ osdc->last_tid = 0;
+ osdc->requests = RB_ROOT;
+ osdc->num_requests = 0;
+ INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
+
+ osdc->req_mempool = mempool_create_kmalloc_pool(10,
+ sizeof(struct ceph_osd_request));
+ if (!osdc->req_mempool)
+ return -ENOMEM;
+ return 0;
+}
+
+void ceph_osdc_stop(struct ceph_osd_client *osdc)
+{
+ cancel_delayed_work_sync(&osdc->timeout_work);
+ if (osdc->osdmap) {
+ ceph_osdmap_destroy(osdc->osdmap);
+ osdc->osdmap = NULL;
+ }
+ mempool_destroy(osdc->req_mempool);
+}
+
+/*
+ * Read some contiguous pages. Return number of bytes read (or
+ * zeroed).
+ */
+int ceph_osdc_readpages(struct ceph_osd_client *osdc,
+ struct ceph_vino vino, struct ceph_file_layout *layout,
+ u64 off, u64 len,
+ u32 truncate_seq, u64 truncate_size,
+ struct page **pages, int num_pages)
+{
+ struct ceph_osd_request *req;
+ int i;
+ struct page *page;
+ int rc = 0, read = 0;
+
+ dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
+ vino.snap, off, len);
+ req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
+ CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
+ NULL, 0, truncate_seq, truncate_size, NULL,
+ false);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ /* it may be a short read due to an object boundary */
+ req->r_pages = pages;
+ num_pages = calc_pages_for(off, len);
+ req->r_num_pages = num_pages;
+
+ dout("readpages final extent is %llu~%llu (%d pages)\n",
+ off, len, req->r_num_pages);
+
+ rc = ceph_osdc_start_request(osdc, req, false);
+ if (!rc)
+ rc = ceph_osdc_wait_request(osdc, req);
+
+ if (rc >= 0) {
+ read = rc;
+ rc = len;
+ } else if (rc == -ENOENT) {
+ rc = len;
+ }
+
+ /* zero trailing pages on success */
+ if (read < (num_pages << PAGE_CACHE_SHIFT)) {
+ if (read & ~PAGE_CACHE_MASK) {
+ i = read >> PAGE_CACHE_SHIFT;
+ page = pages[i];
+ dout("readpages zeroing %d %p from %d\n", i, page,
+ (int)(read & ~PAGE_CACHE_MASK));
+ zero_user_segment(page, read & ~PAGE_CACHE_MASK,
+ PAGE_CACHE_SIZE);
+ read += PAGE_CACHE_SIZE;
+ }
+ for (i = read >> PAGE_CACHE_SHIFT; i < num_pages; i++) {
+ page = req->r_pages[i];
+ dout("readpages zeroing %d %p\n", i, page);
+ zero_user_segment(page, 0, PAGE_CACHE_SIZE);
+ }
+ }
+
+ ceph_osdc_put_request(req);
+ dout("readpages result %d\n", rc);
+ return rc;
+}
+
+/*
+ * do a synchronous write on N pages
+ */
+int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
+ struct ceph_file_layout *layout,
+ struct ceph_snap_context *snapc,
+ u64 off, u64 len,
+ u32 truncate_seq, u64 truncate_size,
+ struct timespec *mtime,
+ struct page **pages, int num_pages,
+ int flags, int do_sync, bool nofail)
+{
+ struct ceph_osd_request *req;
+ int rc = 0;
+
+ BUG_ON(vino.snap != CEPH_NOSNAP);
+ req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
+ CEPH_OSD_OP_WRITE,
+ flags | CEPH_OSD_FLAG_ONDISK |
+ CEPH_OSD_FLAG_WRITE,
+ snapc, do_sync,
+ truncate_seq, truncate_size, mtime,
+ nofail);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ /* it may be a short write due to an object boundary */
+ req->r_pages = pages;
+ req->r_num_pages = calc_pages_for(off, len);
+ dout("writepages %llu~%llu (%d pages)\n", off, len,
+ req->r_num_pages);
+
+ rc = ceph_osdc_start_request(osdc, req, nofail);
+ if (!rc)
+ rc = ceph_osdc_wait_request(osdc, req);
+
+ ceph_osdc_put_request(req);
+ if (rc == 0)
+ rc = len;
+ dout("writepages result %d\n", rc);
+ return rc;
+}
+
diff --git a/fs/ceph/osd_client.h b/fs/ceph/osd_client.h
new file mode 100644
index 0000000..fa6c5e1
--- /dev/null
+++ b/fs/ceph/osd_client.h
@@ -0,0 +1,136 @@
+#ifndef _FS_CEPH_OSD_CLIENT_H
+#define _FS_CEPH_OSD_CLIENT_H
+
+#include <linux/radix-tree.h>
+#include <linux/completion.h>
+#include <linux/mempool.h>
+
+#include "types.h"
+#include "osdmap.h"
+
+struct ceph_msg;
+struct ceph_snap_context;
+struct ceph_osd_request;
+struct ceph_osd_client;
+
+/*
+ * completion callback for async writepages
+ */
+typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *);
+
+/* an in-flight request */
+struct ceph_osd_request {
+ u64 r_tid; /* unique for this client */
+ struct rb_node r_node;
+
+ struct ceph_msg *r_request;
+ struct ceph_msg *r_reply;
+ int r_result;
+ int r_flags; /* any additional flags for the osd */
+ int r_aborted; /* set if we cancel this request */
+
+ struct ceph_osd_client *r_osdc;
+ atomic_t r_ref;
+ bool r_mempool;
+ struct completion r_completion, r_safe_completion;
+ ceph_osdc_callback_t r_callback, r_safe_callback;
+ struct ceph_eversion r_reassert_version;
+ struct list_head r_unsafe_item;
+
+ struct inode *r_inode; /* for use by callbacks */
+ struct writeback_control *r_wbc; /* ditto */
+
+ char r_oid[40]; /* object name */
+ int r_oid_len;
+ int r_last_osd; /* pg osds */
+ struct ceph_entity_addr r_last_osd_addr;
+ unsigned long r_timeout_stamp;
+ bool r_resend; /* msg send failed, needs retry */
+
+ struct ceph_file_layout r_file_layout;
+ struct ceph_snap_context *r_snapc; /* snap context for writes */
+ unsigned r_num_pages; /* size of page array (follows) */
+ struct page **r_pages; /* pages for data payload */
+ int r_pages_from_pool;
+ int r_own_pages; /* if true, i own page list */
+};
+
+struct ceph_osd_client {
+ struct ceph_client *client;
+
+ struct ceph_osdmap *osdmap; /* current map */
+ struct rw_semaphore map_sem;
+ struct completion map_waiters;
+ u64 last_requested_map;
+
+ struct mutex request_mutex;
+ u64 timeout_tid; /* tid of timeout triggering rq */
+ u64 last_tid; /* tid of last request */
+ struct rb_root requests; /* pending requests */
+ int num_requests;
+ struct delayed_work timeout_work;
+ struct dentry *debugfs_file;
+
+ mempool_t *req_mempool;
+};
+
+extern int ceph_osdc_init(struct ceph_osd_client *osdc,
+ struct ceph_client *client);
+extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
+
+extern void ceph_osdc_handle_reset(struct ceph_osd_client *osdc,
+ struct ceph_entity_addr *addr);
+
+extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
+ struct ceph_msg *msg);
+extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
+ struct ceph_msg *msg);
+
+/* incoming read messages use this to discover which pages to read
+ * the data payload into. */
+extern int ceph_osdc_prepare_pages(void *p, struct ceph_msg *m, int want);
+
+extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
+ struct ceph_file_layout *layout,
+ struct ceph_vino vino,
+ u64 offset, u64 *len, int op, int flags,
+ struct ceph_snap_context *snapc,
+ int do_sync, u32 truncate_seq,
+ u64 truncate_size,
+ struct timespec *mtime,
+ bool use_mempool);
+
+static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
+{
+ atomic_inc(&req->r_ref);
+}
+extern void ceph_osdc_put_request(struct ceph_osd_request *req);
+
+extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
+ struct ceph_osd_request *req,
+ bool nofail);
+extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
+ struct ceph_osd_request *req);
+extern void ceph_osdc_abort_request(struct ceph_osd_client *osdc,
+ struct ceph_osd_request *req);
+extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
+
+extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
+ struct ceph_vino vino,
+ struct ceph_file_layout *layout,
+ u64 off, u64 len,
+ u32 truncate_seq, u64 truncate_size,
+ struct page **pages, int nr_pages);
+
+extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
+ struct ceph_vino vino,
+ struct ceph_file_layout *layout,
+ struct ceph_snap_context *sc,
+ u64 off, u64 len,
+ u32 truncate_seq, u64 truncate_size,
+ struct timespec *mtime,
+ struct page **pages, int nr_pages,
+ int flags, int do_sync, bool nofail);
+
+#endif
+
diff --git a/fs/ceph/osdmap.c b/fs/ceph/osdmap.c
new file mode 100644
index 0000000..362f5a0
--- /dev/null
+++ b/fs/ceph/osdmap.c
@@ -0,0 +1,697 @@
+
+#include <asm/div64.h>
+
+#include "super.h"
+#include "osdmap.h"
+#include "crush/hash.h"
+#include "decode.h"
+#include "ceph_debug.h"
+
+
+char *ceph_osdmap_state_str(char *str, int len, int state)
+{
+ int flag = 0;
+
+ if (!len)
+ goto done;
+
+ *str = '\0';
+ if (state) {
+ if (state & CEPH_OSD_EXISTS) {
+ snprintf(str, len, "exists");
+ flag = 1;
+ }
+ if (state & CEPH_OSD_UP) {
+ snprintf(str, len, "%s%s%s", str, (flag ? ", " : ""),
+ "up");
+ flag = 1;
+ }
+ } else {
+ snprintf(str, len, "doesn't exist");
+ }
+done:
+ return str;
+}
+
+/* maps */
+
+static int calc_bits_of(unsigned t)
+{
+ int b = 0;
+ while (t) {
+ t = t >> 1;
+ b++;
+ }
+ return b;
+}
+
+/*
+ * the foo_mask is the smallest value 2^n-1 that is >= foo.
+ */
+static void calc_pg_masks(struct ceph_pg_pool_info *pi)
+{
+ pi->pg_num_mask = (1 << calc_bits_of(le32_to_cpu(pi->v.pg_num)-1)) - 1;
+ pi->pgp_num_mask =
+ (1 << calc_bits_of(le32_to_cpu(pi->v.pgp_num)-1)) - 1;
+ pi->lpg_num_mask =
+ (1 << calc_bits_of(le32_to_cpu(pi->v.lpg_num)-1)) - 1;
+ pi->lpgp_num_mask =
+ (1 << calc_bits_of(le32_to_cpu(pi->v.lpgp_num)-1)) - 1;
+}
+
+/*
+ * decode crush map
+ */
+static int crush_decode_uniform_bucket(void **p, void *end,
+ struct crush_bucket_uniform *b)
+{
+ dout("crush_decode_uniform_bucket %p to %p\n", *p, end);
+ ceph_decode_need(p, end, (1+b->h.size) * sizeof(u32), bad);
+ ceph_decode_32(p, b->item_weight);
+ return 0;
+bad:
+ return -EINVAL;
+}
+
+static int crush_decode_list_bucket(void **p, void *end,
+ struct crush_bucket_list *b)
+{
+ int j;
+ dout("crush_decode_list_bucket %p to %p\n", *p, end);
+ b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
+ if (b->item_weights == NULL)
+ return -ENOMEM;
+ b->sum_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
+ if (b->sum_weights == NULL)
+ return -ENOMEM;
+ ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
+ for (j = 0; j < b->h.size; j++) {
+ ceph_decode_32(p, b->item_weights[j]);
+ ceph_decode_32(p, b->sum_weights[j]);
+ }
+ return 0;
+bad:
+ return -EINVAL;
+}
+
+static int crush_decode_tree_bucket(void **p, void *end,
+ struct crush_bucket_tree *b)
+{
+ int j;
+ dout("crush_decode_tree_bucket %p to %p\n", *p, end);
+ ceph_decode_32_safe(p, end, b->num_nodes, bad);
+ b->node_weights = kcalloc(b->num_nodes, sizeof(u32), GFP_NOFS);
+ if (b->node_weights == NULL)
+ return -ENOMEM;
+ ceph_decode_need(p, end, b->num_nodes * sizeof(u32), bad);
+ for (j = 0; j < b->num_nodes; j++)
+ ceph_decode_32(p, b->node_weights[j]);
+ return 0;
+bad:
+ return -EINVAL;
+}
+
+static int crush_decode_straw_bucket(void **p, void *end,
+ struct crush_bucket_straw *b)
+{
+ int j;
+ dout("crush_decode_straw_bucket %p to %p\n", *p, end);
+ b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
+ if (b->item_weights == NULL)
+ return -ENOMEM;
+ b->straws = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
+ if (b->straws == NULL)
+ return -ENOMEM;
+ ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
+ for (j = 0; j < b->h.size; j++) {
+ ceph_decode_32(p, b->item_weights[j]);
+ ceph_decode_32(p, b->straws[j]);
+ }
+ return 0;
+bad:
+ return -EINVAL;
+}
+
+static struct crush_map *crush_decode(void *pbyval, void *end)
+{
+ struct crush_map *c;
+ int err = -EINVAL;
+ int i, j;
+ void **p = &pbyval;
+ void *start = pbyval;
+ u32 magic;
+
+ dout("crush_decode %p to %p len %d\n", *p, end, (int)(end - *p));
+
+ c = kzalloc(sizeof(*c), GFP_NOFS);
+ if (c == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ ceph_decode_need(p, end, 4*sizeof(u32), bad);
+ ceph_decode_32(p, magic);
+ if (magic != CRUSH_MAGIC) {
+ pr_err("ceph crush_decode magic %x != current %x\n",
+ (unsigned)magic, (unsigned)CRUSH_MAGIC);
+ goto bad;
+ }
+ ceph_decode_32(p, c->max_buckets);
+ ceph_decode_32(p, c->max_rules);
+ ceph_decode_32(p, c->max_devices);
+
+ c->device_parents = kcalloc(c->max_devices, sizeof(u32), GFP_NOFS);
+ if (c->device_parents == NULL)
+ goto badmem;
+ c->bucket_parents = kcalloc(c->max_buckets, sizeof(u32), GFP_NOFS);
+ if (c->bucket_parents == NULL)
+ goto badmem;
+
+ c->buckets = kcalloc(c->max_buckets, sizeof(*c->buckets), GFP_NOFS);
+ if (c->buckets == NULL)
+ goto badmem;
+ c->rules = kcalloc(c->max_rules, sizeof(*c->rules), GFP_NOFS);
+ if (c->rules == NULL)
+ goto badmem;
+
+ /* buckets */
+ for (i = 0; i < c->max_buckets; i++) {
+ int size = 0;
+ u32 alg;
+ struct crush_bucket *b;
+
+ ceph_decode_32_safe(p, end, alg, bad);
+ if (alg == 0) {
+ c->buckets[i] = NULL;
+ continue;
+ }
+ dout("crush_decode bucket %d off %x %p to %p\n",
+ i, (int)(*p-start), *p, end);
+
+ switch (alg) {
+ case CRUSH_BUCKET_UNIFORM:
+ size = sizeof(struct crush_bucket_uniform);
+ break;
+ case CRUSH_BUCKET_LIST:
+ size = sizeof(struct crush_bucket_list);
+ break;
+ case CRUSH_BUCKET_TREE:
+ size = sizeof(struct crush_bucket_tree);
+ break;
+ case CRUSH_BUCKET_STRAW:
+ size = sizeof(struct crush_bucket_straw);
+ break;
+ default:
+ goto bad;
+ }
+ BUG_ON(size == 0);
+ b = c->buckets[i] = kzalloc(size, GFP_NOFS);
+ if (b == NULL)
+ goto badmem;
+
+ ceph_decode_need(p, end, 4*sizeof(u32), bad);
+ ceph_decode_32(p, b->id);
+ ceph_decode_16(p, b->type);
+ ceph_decode_16(p, b->alg);
+ ceph_decode_32(p, b->weight);
+ ceph_decode_32(p, b->size);
+
+ dout("crush_decode bucket size %d off %x %p to %p\n",
+ b->size, (int)(*p-start), *p, end);
+
+ b->items = kcalloc(b->size, sizeof(__s32), GFP_NOFS);
+ if (b->items == NULL)
+ goto badmem;
+ b->perm = kcalloc(b->size, sizeof(u32), GFP_NOFS);
+ if (b->perm == NULL)
+ goto badmem;
+ b->perm_n = 0;
+
+ ceph_decode_need(p, end, b->size*sizeof(u32), bad);
+ for (j = 0; j < b->size; j++)
+ ceph_decode_32(p, b->items[j]);
+
+ switch (b->alg) {
+ case CRUSH_BUCKET_UNIFORM:
+ err = crush_decode_uniform_bucket(p, end,
+ (struct crush_bucket_uniform *)b);
+ if (err < 0)
+ goto bad;
+ break;
+ case CRUSH_BUCKET_LIST:
+ err = crush_decode_list_bucket(p, end,
+ (struct crush_bucket_list *)b);
+ if (err < 0)
+ goto bad;
+ break;
+ case CRUSH_BUCKET_TREE:
+ err = crush_decode_tree_bucket(p, end,
+ (struct crush_bucket_tree *)b);
+ if (err < 0)
+ goto bad;
+ break;
+ case CRUSH_BUCKET_STRAW:
+ err = crush_decode_straw_bucket(p, end,
+ (struct crush_bucket_straw *)b);
+ if (err < 0)
+ goto bad;
+ break;
+ }
+ }
+
+ /* rules */
+ dout("rule vec is %p\n", c->rules);
+ for (i = 0; i < c->max_rules; i++) {
+ u32 yes;
+ struct crush_rule *r;
+
+ ceph_decode_32_safe(p, end, yes, bad);
+ if (!yes) {
+ dout("crush_decode NO rule %d off %x %p to %p\n",
+ i, (int)(*p-start), *p, end);
+ c->rules[i] = NULL;
+ continue;
+ }
+
+ dout("crush_decode rule %d off %x %p to %p\n",
+ i, (int)(*p-start), *p, end);
+
+ /* len */
+ ceph_decode_32_safe(p, end, yes, bad);
+#if BITS_PER_LONG == 32
+ if (yes > ULONG_MAX / sizeof(struct crush_rule_step))
+ goto bad;
+#endif
+ r = c->rules[i] = kmalloc(sizeof(*r) +
+ yes*sizeof(struct crush_rule_step),
+ GFP_NOFS);
+ if (r == NULL)
+ goto badmem;
+ dout(" rule %d is at %p\n", i, r);
+ r->len = yes;
+ ceph_decode_copy_safe(p, end, &r->mask, 4, bad); /* 4 u8's */
+ ceph_decode_need(p, end, r->len*3*sizeof(u32), bad);
+ for (j = 0; j < r->len; j++) {
+ ceph_decode_32(p, r->steps[j].op);
+ ceph_decode_32(p, r->steps[j].arg1);
+ ceph_decode_32(p, r->steps[j].arg2);
+ }
+ }
+
+ /* ignore trailing name maps. */
+
+ dout("crush_decode success\n");
+ return c;
+
+badmem:
+ err = -ENOMEM;
+bad:
+ dout("crush_decode fail %d\n", err);
+ crush_destroy(c);
+ return ERR_PTR(err);
+}
+
+
+/*
+ * osd map
+ */
+void ceph_osdmap_destroy(struct ceph_osdmap *map)
+{
+ dout("osdmap_destroy %p\n", map);
+ if (map->crush)
+ crush_destroy(map->crush);
+ kfree(map->osd_state);
+ kfree(map->osd_weight);
+ kfree(map->pg_pool);
+ kfree(map->osd_addr);
+ kfree(map);
+}
+
+/*
+ * adjust max osd value. reallocate arrays.
+ */
+static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
+{
+ u8 *state;
+ struct ceph_entity_addr *addr;
+ u32 *weight;
+
+ state = kcalloc(max, sizeof(*state), GFP_NOFS);
+ addr = kcalloc(max, sizeof(*addr), GFP_NOFS);
+ weight = kcalloc(max, sizeof(*weight), GFP_NOFS);
+ if (state == NULL || addr == NULL || weight == NULL) {
+ kfree(state);
+ kfree(addr);
+ kfree(weight);
+ return -ENOMEM;
+ }
+
+ /* copy old? */
+ if (map->osd_state) {
+ memcpy(state, map->osd_state, map->max_osd*sizeof(*state));
+ memcpy(addr, map->osd_addr, map->max_osd*sizeof(*addr));
+ memcpy(weight, map->osd_weight, map->max_osd*sizeof(*weight));
+ kfree(map->osd_state);
+ kfree(map->osd_addr);
+ kfree(map->osd_weight);
+ }
+
+ map->osd_state = state;
+ map->osd_weight = weight;
+ map->osd_addr = addr;
+ map->max_osd = max;
+ return 0;
+}
+
+/*
+ * decode a full map.
+ */
+struct ceph_osdmap *osdmap_decode(void **p, void *end)
+{
+ struct ceph_osdmap *map;
+ u16 version;
+ u32 len, max, i;
+ int err = -EINVAL;
+ void *start = *p;
+
+ dout("osdmap_decode %p to %p len %d\n", *p, end, (int)(end - *p));
+
+ map = kzalloc(sizeof(*map), GFP_NOFS);
+ if (map == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ ceph_decode_16_safe(p, end, version, bad);
+
+ ceph_decode_need(p, end, 2*sizeof(u64)+6*sizeof(u32), bad);
+ ceph_decode_copy(p, &map->fsid, sizeof(map->fsid));
+ ceph_decode_32(p, map->epoch);
+ ceph_decode_copy(p, &map->created, sizeof(map->created));
+ ceph_decode_copy(p, &map->modified, sizeof(map->modified));
+
+ ceph_decode_32(p, map->num_pools);
+ map->pg_pool = kcalloc(map->num_pools, sizeof(*map->pg_pool),
+ GFP_NOFS);
+ if (!map->pg_pool) {
+ err = -ENOMEM;
+ goto bad;
+ }
+ ceph_decode_32_safe(p, end, max, bad);
+ while (max--) {
+ ceph_decode_need(p, end, 4+sizeof(map->pg_pool->v), bad);
+ ceph_decode_32(p, i);
+ if (i >= map->num_pools)
+ goto bad;
+ ceph_decode_copy(p, &map->pg_pool[i].v,
+ sizeof(map->pg_pool->v));
+ calc_pg_masks(&map->pg_pool[i]);
+ p += le32_to_cpu(map->pg_pool[i].v.num_snaps) * sizeof(u64);
+ p += le32_to_cpu(map->pg_pool[i].v.num_removed_snap_intervals)
+ * sizeof(u64) * 2;
+ }
+
+ ceph_decode_32_safe(p, end, map->flags, bad);
+
+ ceph_decode_32(p, max);
+
+ /* (re)alloc osd arrays */
+ err = osdmap_set_max_osd(map, max);
+ if (err < 0)
+ goto bad;
+ dout("osdmap_decode max_osd = %d\n", map->max_osd);
+
+ /* osds */
+ err = -EINVAL;
+ ceph_decode_need(p, end, 3*sizeof(u32) +
+ map->max_osd*(1 + sizeof(*map->osd_weight) +
+ sizeof(*map->osd_addr)), bad);
+ *p += 4; /* skip length field (should match max) */
+ ceph_decode_copy(p, map->osd_state, map->max_osd);
+
+ *p += 4; /* skip length field (should match max) */
+ for (i = 0; i < map->max_osd; i++)
+ ceph_decode_32(p, map->osd_weight[i]);
+
+ *p += 4; /* skip length field (should match max) */
+ ceph_decode_copy(p, map->osd_addr, map->max_osd*sizeof(*map->osd_addr));
+
+ /* crush */
+ ceph_decode_32_safe(p, end, len, bad);
+ dout("osdmap_decode crush len %d from off 0x%x\n", len,
+ (int)(*p - start));
+ ceph_decode_need(p, end, len, bad);
+ map->crush = crush_decode(*p, end);
+ *p += len;
+ if (IS_ERR(map->crush)) {
+ err = PTR_ERR(map->crush);
+ map->crush = NULL;
+ goto bad;
+ }
+
+ /* ignore the rest of the map */
+ *p = end;
+
+ dout("osdmap_decode done %p %p\n", *p, end);
+ return map;
+
+bad:
+ dout("osdmap_decode fail\n");
+ ceph_osdmap_destroy(map);
+ return ERR_PTR(err);
+}
+
+/*
+ * decode and apply an incremental map update.
+ */
+struct ceph_osdmap *apply_incremental(void **p, void *end,
+ struct ceph_osdmap *map,
+ struct ceph_messenger *msgr)
+{
+ struct ceph_osdmap *newmap = map;
+ struct crush_map *newcrush = NULL;
+ ceph_fsid_t fsid;
+ u32 epoch = 0;
+ struct ceph_timespec modified;
+ u32 len, pool;
+ __s32 new_flags, max;
+ void *start = *p;
+ int err = -EINVAL;
+ u16 version;
+
+ ceph_decode_16_safe(p, end, version, bad);
+
+ ceph_decode_need(p, end, sizeof(fsid)+sizeof(modified)+2*sizeof(u32),
+ bad);
+ ceph_decode_copy(p, &fsid, sizeof(fsid));
+ ceph_decode_32(p, epoch);
+ BUG_ON(epoch != map->epoch+1);
+ ceph_decode_copy(p, &modified, sizeof(modified));
+ ceph_decode_32(p, new_flags);
+
+ /* full map? */
+ ceph_decode_32_safe(p, end, len, bad);
+ if (len > 0) {
+ dout("apply_incremental full map len %d, %p to %p\n",
+ len, *p, end);
+ newmap = osdmap_decode(p, min(*p+len, end));
+ return newmap; /* error or not */
+ }
+
+ /* new crush? */
+ ceph_decode_32_safe(p, end, len, bad);
+ if (len > 0) {
+ dout("apply_incremental new crush map len %d, %p to %p\n",
+ len, *p, end);
+ newcrush = crush_decode(*p, min(*p+len, end));
+ if (IS_ERR(newcrush))
+ return ERR_PTR(PTR_ERR(newcrush));
+ }
+
+ /* new flags? */
+ if (new_flags >= 0)
+ map->flags = new_flags;
+
+ ceph_decode_need(p, end, 5*sizeof(u32), bad);
+
+ /* new max? */
+ ceph_decode_32(p, max);
+ if (max >= 0) {
+ err = osdmap_set_max_osd(map, max);
+ if (err < 0)
+ goto bad;
+ }
+
+ map->epoch++;
+ map->modified = map->modified;
+ if (newcrush) {
+ if (map->crush)
+ crush_destroy(map->crush);
+ map->crush = newcrush;
+ newcrush = NULL;
+ }
+
+ /* new_pool */
+ ceph_decode_32_safe(p, end, len, bad);
+ while (len--) {
+ ceph_decode_32_safe(p, end, pool, bad);
+ if (pool >= map->num_pools) {
+ void *pg_pool = kcalloc(pool + 1,
+ sizeof(*map->pg_pool),
+ GFP_NOFS);
+ if (!pg_pool) {
+ err = -ENOMEM;
+ goto bad;
+ }
+ memcpy(pg_pool, map->pg_pool,
+ map->num_pools * sizeof(*map->pg_pool));
+ kfree(map->pg_pool);
+ map->pg_pool = pg_pool;
+ map->num_pools = pool+1;
+ }
+ ceph_decode_copy(p, &map->pg_pool[pool].v,
+ sizeof(map->pg_pool->v));
+ calc_pg_masks(&map->pg_pool[pool]);
+ }
+
+ /* old_pool (ignore) */
+ ceph_decode_32_safe(p, end, len, bad);
+ *p += len * sizeof(u32);
+
+ /* new_up */
+ err = -EINVAL;
+ ceph_decode_32_safe(p, end, len, bad);
+ while (len--) {
+ u32 osd;
+ struct ceph_entity_addr addr;
+ ceph_decode_32_safe(p, end, osd, bad);
+ ceph_decode_copy_safe(p, end, &addr, sizeof(addr), bad);
+ pr_info("ceph osd%d up\n", osd);
+ BUG_ON(osd >= map->max_osd);
+ map->osd_state[osd] |= CEPH_OSD_UP;
+ map->osd_addr[osd] = addr;
+ }
+
+ /* new_down */
+ ceph_decode_32_safe(p, end, len, bad);
+ while (len--) {
+ u32 osd;
+ ceph_decode_32_safe(p, end, osd, bad);
+ (*p)++; /* clean flag */
+ pr_info("ceph osd%d down\n", osd);
+ if (osd < map->max_osd) {
+ map->osd_state[osd] &= ~CEPH_OSD_UP;
+ ceph_messenger_mark_down(msgr, &map->osd_addr[osd]);
+ }
+ }
+
+ /* new_weight */
+ ceph_decode_32_safe(p, end, len, bad);
+ while (len--) {
+ u32 osd, off;
+ ceph_decode_need(p, end, sizeof(u32)*2, bad);
+ ceph_decode_32(p, osd);
+ ceph_decode_32(p, off);
+ pr_info("ceph osd%d weight 0x%x %s\n", osd, off,
+ off == CEPH_OSD_IN ? "(in)" :
+ (off == CEPH_OSD_OUT ? "(out)" : ""));
+ if (osd < map->max_osd)
+ map->osd_weight[osd] = off;
+ }
+
+ /* ignore the rest */
+ *p = end;
+ return map;
+
+bad:
+ pr_err("ceph corrupt inc osdmap epoch %d off %d (%p of %p-%p)\n",
+ epoch, (int)(*p - start), *p, start, end);
+ if (newcrush)
+ crush_destroy(newcrush);
+ return ERR_PTR(err);
+}
+
+
+
+
+/*
+ * calculate file layout from given offset, length.
+ * fill in correct oid, logical length, and object extent
+ * offset, length.
+ *
+ * for now, we write only a single su, until we can
+ * pass a stride back to the caller.
+ */
+void ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
+ u64 off, u64 *plen,
+ u64 *bno,
+ u64 *oxoff, u64 *oxlen)
+{
+ u32 osize = le32_to_cpu(layout->fl_object_size);
+ u32 su = le32_to_cpu(layout->fl_stripe_unit);
+ u32 sc = le32_to_cpu(layout->fl_stripe_count);
+ u32 bl, stripeno, stripepos, objsetno;
+ u32 su_per_object;
+ u64 t;
+
+ dout("mapping %llu~%llu osize %u fl_su %u\n", off, *plen,
+ osize, su);
+ su_per_object = osize / le32_to_cpu(layout->fl_stripe_unit);
+ dout("osize %u / su %u = su_per_object %u\n", osize, su,
+ su_per_object);
+
+ BUG_ON((su & ~PAGE_MASK) != 0);
+ /* bl = *off / su; */
+ t = off;
+ do_div(t, su);
+ bl = t;
+ dout("off %llu / su %u = bl %u\n", off, su, bl);
+
+ stripeno = bl / sc;
+ stripepos = bl % sc;
+ objsetno = stripeno / su_per_object;
+
+ *bno = cpu_to_le32(objsetno * sc + stripepos);
+ dout("objset %u * sc %u = bno %u\n", objsetno, sc, (unsigned)*bno);
+ /* *oxoff = *off / layout->fl_stripe_unit; */
+ t = off;
+ *oxoff = do_div(t, su);
+ *oxlen = min_t(u64, *plen, su - *oxoff);
+ *plen = *oxlen;
+
+ dout(" obj extent %llu~%llu\n", *oxoff, *oxlen);
+}
+
+/*
+ * calculate an object layout (i.e. pgid) from an oid,
+ * file_layout, and osdmap
+ */
+int ceph_calc_object_layout(struct ceph_object_layout *ol,
+ const char *oid,
+ struct ceph_file_layout *fl,
+ struct ceph_osdmap *osdmap)
+{
+ unsigned num, num_mask;
+ union ceph_pg pgid;
+ s32 preferred = (s32)le32_to_cpu(fl->fl_pg_preferred);
+ int poolid = le32_to_cpu(fl->fl_pg_pool);
+ struct ceph_pg_pool_info *pool;
+
+ if (poolid >= osdmap->num_pools)
+ return -EIO;
+ pool = &osdmap->pg_pool[poolid];
+
+ if (preferred >= 0) {
+ num = le32_to_cpu(pool->v.lpg_num);
+ num_mask = pool->lpg_num_mask;
+ } else {
+ num = le32_to_cpu(pool->v.pg_num);
+ num_mask = pool->pg_num_mask;
+ }
+
+ pgid.pg64 = 0; /* start with it zeroed out */
+ pgid.pg.ps = ceph_full_name_hash(oid, strlen(oid));
+ pgid.pg.preferred = preferred;
+ pgid.pg.pool = le32_to_cpu(fl->fl_pg_pool);
+
+ ol->ol_pgid = cpu_to_le64(pgid.pg64);
+ ol->ol_stripe_unit = fl->fl_object_stripe_unit;
+
+ return 0;
+}
diff --git a/fs/ceph/osdmap.h b/fs/ceph/osdmap.h
new file mode 100644
index 0000000..757aaf5
--- /dev/null
+++ b/fs/ceph/osdmap.h
@@ -0,0 +1,83 @@
+#ifndef _FS_CEPH_OSDMAP_H
+#define _FS_CEPH_OSDMAP_H
+
+#include "types.h"
+#include "ceph_fs.h"
+#include "crush/crush.h"
+
+/*
+ * The osd map describes the current membership of the osd cluster and
+ * specifies the mapping of objects to placement groups and placement
+ * groups to (sets of) osds. That is, it completely specifies the
+ * (desired) distribution of all data objects in the system at some
+ * point in time.
+ *
+ * Each map version is identified by an epoch, which increases monotonically.
+ *
+ * The map can be updated either via an incremental map (diff) describing
+ * the change between two successive epochs, or as a fully encoded map.
+ */
+struct ceph_pg_pool_info {
+ struct ceph_pg_pool v;
+ int pg_num_mask, pgp_num_mask, lpg_num_mask, lpgp_num_mask;
+};
+
+struct ceph_osdmap {
+ ceph_fsid_t fsid;
+ u32 epoch;
+ u32 mkfs_epoch;
+ struct ceph_timespec created, modified;
+
+ u32 flags; /* CEPH_OSDMAP_* */
+
+ u32 max_osd; /* size of osd_state, _offload, _addr arrays */
+ u8 *osd_state; /* CEPH_OSD_* */
+ u32 *osd_weight; /* 0 = failed, 0x10000 = 100% normal */
+ struct ceph_entity_addr *osd_addr;
+
+ u32 num_pools;
+ struct ceph_pg_pool_info *pg_pool;
+
+ /* the CRUSH map specifies the mapping of placement groups to
+ * the list of osds that store+replicate them. */
+ struct crush_map *crush;
+};
+
+static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd)
+{
+ return (osd < map->max_osd) && (map->osd_state[osd] & CEPH_OSD_UP);
+}
+
+static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag)
+{
+ return map && (map->flags & flag);
+}
+
+extern char *ceph_osdmap_state_str(char *str, int len, int state);
+
+static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,
+ int osd)
+{
+ if (osd >= map->max_osd)
+ return 0;
+ return &map->osd_addr[osd];
+}
+
+extern struct ceph_osdmap *osdmap_decode(void **p, void *end);
+extern struct ceph_osdmap *apply_incremental(void **p, void *end,
+ struct ceph_osdmap *map,
+ struct ceph_messenger *msgr);
+extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
+
+/* calculate mapping of a file extent to an object */
+extern void ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
+ u64 off, u64 *plen,
+ u64 *bno, u64 *oxoff, u64 *oxlen);
+
+/* calculate mapping of object to a placement group */
+extern int ceph_calc_object_layout(struct ceph_object_layout *ol,
+ const char *oid,
+ struct ceph_file_layout *fl,
+ struct ceph_osdmap *osdmap);
+
+#endif
--
1.5.6.5
--
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