blob: 44abe299c69f84e0ab8693aae776e87fc0b69291 [file] [log] [blame]
#include "ceph_debug.h"
#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 "super.h"
#include "osd_client.h"
#include "messenger.h"
#include "decode.h"
#include "auth.h"
const static struct ceph_connection_operations osd_con_ops;
static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd);
/*
* 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->extent.offset = cpu_to_le64(objoff);
op->extent.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_release_request(struct kref *kref)
{
struct ceph_osd_request *req = container_of(kref,
struct ceph_osd_request,
r_kref);
if (req->r_request)
ceph_msg_put(req->r_request);
if (req->r_reply)
ceph_msg_put(req->r_reply);
if (req->r_con_filling_pages) {
dout("release_request revoking pages %p from con %p\n",
req->r_pages, req->r_con_filling_pages);
ceph_con_revoke_pages(req->r_con_filling_pages,
req->r_pages);
ceph_con_put(req->r_con_filling_pages);
}
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, int num_reply)
{
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 err, 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);
err = ceph_msgpool_resv(&osdc->msgpool_op_reply, num_reply);
if (err) {
ceph_osdc_put_request(req);
return ERR_PTR(-ENOMEM);
}
req->r_num_prealloc_reply = num_reply;
req->r_osdc = osdc;
req->r_mempool = use_mempool;
kref_init(&req->r_kref);
init_completion(&req->r_completion);
init_completion(&req->r_safe_completion);
INIT_LIST_HEAD(&req->r_unsafe_item);
req->r_flags = flags;
WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
/* create message; allow space for oid */
msg_size += 40;
if (snapc)
msg_size += sizeof(u64) * snapc->num_snaps;
if (use_mempool)
msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
else
msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, 0, 0, NULL);
if (IS_ERR(msg)) {
ceph_msgpool_resv(&osdc->msgpool_op_reply, -num_reply);
ceph_osdc_put_request(req);
return ERR_PTR(PTR_ERR(msg));
}
msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
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 */
head->object_len = cpu_to_le32(req->r_oid_len);
memcpy(p, req->r_oid, req->r_oid_len);
p += req->r_oid_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->trunc.truncate_seq = cpu_to_le32(truncate_seq);
prevofs = le64_to_cpu((op-1)->extent.offset);
op->trunc.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;
}
/*
* If the osd connection drops, we need to resubmit all requests.
*/
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;
osd->o_incarnation++;
down_read(&osdc->map_sem);
kick_requests(osdc, osd);
up_read(&osdc->map_sem);
}
/*
* Track open sessions with osds.
*/
static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
{
struct ceph_osd *osd;
osd = kzalloc(sizeof(*osd), GFP_NOFS);
if (!osd)
return NULL;
atomic_set(&osd->o_ref, 1);
osd->o_osdc = osdc;
INIT_LIST_HEAD(&osd->o_requests);
osd->o_incarnation = 1;
ceph_con_init(osdc->client->msgr, &osd->o_con);
osd->o_con.private = osd;
osd->o_con.ops = &osd_con_ops;
osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
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);
if (atomic_dec_and_test(&osd->o_ref))
kfree(osd);
}
/*
* remove an osd from our map
*/
static void remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
{
dout("remove_osd %p\n", osd);
BUG_ON(!list_empty(&osd->o_requests));
rb_erase(&osd->o_node, &osdc->osds);
ceph_con_close(&osd->o_con);
put_osd(osd);
}
/*
* reset osd connect
*/
static int reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
{
int ret = 0;
dout("reset_osd %p osd%d\n", osd, osd->o_osd);
if (list_empty(&osd->o_requests)) {
remove_osd(osdc, osd);
} else {
ceph_con_close(&osd->o_con);
ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
osd->o_incarnation++;
}
return ret;
}
static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
{
struct rb_node **p = &osdc->osds.rb_node;
struct rb_node *parent = NULL;
struct ceph_osd *osd = NULL;
while (*p) {
parent = *p;
osd = rb_entry(parent, struct ceph_osd, o_node);
if (new->o_osd < osd->o_osd)
p = &(*p)->rb_left;
else if (new->o_osd > osd->o_osd)
p = &(*p)->rb_right;
else
BUG();
}
rb_link_node(&new->o_node, parent, p);
rb_insert_color(&new->o_node, &osdc->osds);
}
static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
{
struct ceph_osd *osd;
struct rb_node *n = osdc->osds.rb_node;
while (n) {
osd = rb_entry(n, struct ceph_osd, o_node);
if (o < osd->o_osd)
n = n->rb_left;
else if (o > osd->o_osd)
n = n->rb_right;
else
return osd;
}
return NULL;
}
/*
* Register request, assign tid. If this is the first request, set up
* the timeout event.
*/
static void register_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
mutex_lock(&osdc->request_mutex);
req->r_tid = ++osdc->last_tid;
req->r_request->hdr.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_msgpool_resv(&osdc->msgpool_op_reply, -req->r_num_prealloc_reply);
if (req->r_osd) {
/* make sure the original request isn't in flight. */
ceph_con_revoke(&req->r_osd->o_con, req->r_request);
list_del_init(&req->r_osd_item);
if (list_empty(&req->r_osd->o_requests))
remove_osd(osdc, req->r_osd);
req->r_osd = NULL;
}
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));
}
}
}
/*
* Cancel a previously queued request message
*/
static void __cancel_request(struct ceph_osd_request *req)
{
if (req->r_sent) {
ceph_con_revoke(&req->r_osd->o_con, req->r_request);
req->r_sent = 0;
}
}
/*
* Pick an osd (the first 'up' osd in the pg), allocate the osd struct
* (as needed), and set the request r_osd appropriately. If there is
* no up osd, set r_osd to NULL.
*
* Return 0 if unchanged, 1 if changed, or negative on error.
*
* Caller should hold map_sem for read and request_mutex.
*/
static int __map_osds(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
struct ceph_pg pgid;
int o = -1;
int err;
struct ceph_osd *newosd = NULL;
dout("map_osds %p tid %lld\n", req, req->r_tid);
err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
&req->r_file_layout, osdc->osdmap);
if (err)
return err;
pgid = reqhead->layout.ol_pgid;
req->r_pgid = pgid;
o = ceph_calc_pg_primary(osdc->osdmap, pgid);
if ((req->r_osd && req->r_osd->o_osd == o &&
req->r_sent >= req->r_osd->o_incarnation) ||
(req->r_osd == NULL && o == -1))
return 0; /* no change */
dout("map_osds tid %llu pgid %d.%x osd%d (was osd%d)\n",
req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
req->r_osd ? req->r_osd->o_osd : -1);
if (req->r_osd) {
__cancel_request(req);
list_del_init(&req->r_osd_item);
if (list_empty(&req->r_osd->o_requests)) {
/* try to re-use r_osd if possible */
newosd = get_osd(req->r_osd);
remove_osd(osdc, newosd);
}
req->r_osd = NULL;
}
req->r_osd = __lookup_osd(osdc, o);
if (!req->r_osd && o >= 0) {
if (newosd) {
req->r_osd = newosd;
newosd = NULL;
} else {
err = -ENOMEM;
req->r_osd = create_osd(osdc);
if (!req->r_osd)
goto out;
}
dout("map_osds osd %p is osd%d\n", req->r_osd, o);
req->r_osd->o_osd = o;
req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
__insert_osd(osdc, req->r_osd);
ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
}
if (req->r_osd)
list_add(&req->r_osd_item, &req->r_osd->o_requests);
err = 1; /* osd changed */
out:
if (newosd)
put_osd(newosd);
return err;
}
/*
* caller should hold map_sem (for read) and request_mutex
*/
static int __send_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
struct ceph_osd_request_head *reqhead;
int err;
err = __map_osds(osdc, req);
if (err < 0)
return err;
if (req->r_osd == NULL) {
dout("send_request %p no up osds in pg\n", req);
ceph_monc_request_next_osdmap(&osdc->client->monc);
return 0;
}
dout("send_request %p tid %llu to osd%d flags %d\n",
req, req->r_tid, req->r_osd->o_osd, req->r_flags);
reqhead = req->r_request->front.iov_base;
reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
reqhead->flags |= cpu_to_le32(req->r_flags); /* e.g., RETRY */
reqhead->reassert_version = req->r_reassert_version;
req->r_timeout_stamp = jiffies+osdc->client->mount_args->osd_timeout*HZ;
ceph_msg_get(req->r_request); /* send consumes a ref */
ceph_con_send(&req->r_osd->o_con, req->r_request);
req->r_sent = req->r_osd->o_incarnation;
return 0;
}
/*
* Timeout callback, called every N seconds when 1 or more osd
* requests has been active for more than N seconds. When this
* happens, we ping all OSDs with requests who have timed out to
* ensure any communications channel reset is detected. Reset the
* request timeouts another N seconds in the future as we go.
* Reschedule the timeout event another N seconds in future (unless
* there are no open requests).
*/
static void handle_timeout(struct work_struct *work)
{
struct ceph_osd_client *osdc =
container_of(work, struct ceph_osd_client, timeout_work.work);
struct ceph_osd_request *req;
struct ceph_osd *osd;
unsigned long timeout = osdc->client->mount_args->osd_timeout * HZ;
unsigned long next_timeout = timeout + jiffies;
struct rb_node *p;
dout("timeout\n");
down_read(&osdc->map_sem);
ceph_monc_request_next_osdmap(&osdc->client->monc);
mutex_lock(&osdc->request_mutex);
for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
req = rb_entry(p, struct ceph_osd_request, r_node);
if (req->r_resend) {
int err;
dout("osdc resending prev failed %lld\n", req->r_tid);
err = __send_request(osdc, req);
if (err)
dout("osdc failed again on %lld\n", req->r_tid);
else
req->r_resend = false;
continue;
}
}
for (p = rb_first(&osdc->osds); p; p = rb_next(p)) {
osd = rb_entry(p, struct ceph_osd, o_node);
if (list_empty(&osd->o_requests))
continue;
req = list_first_entry(&osd->o_requests,
struct ceph_osd_request, r_osd_item);
if (time_before(jiffies, req->r_timeout_stamp))
continue;
dout(" tid %llu (at least) timed out on osd%d\n",
req->r_tid, osd->o_osd);
req->r_timeout_stamp = next_timeout;
ceph_con_keepalive(&osd->o_con);
}
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.
*/
static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
struct ceph_connection *con)
{
struct ceph_osd_reply_head *rhead = msg->front.iov_base;
struct ceph_osd_request *req;
u64 tid;
int numops, object_len, flags;
tid = le64_to_cpu(msg->hdr.tid);
if (msg->front.iov_len < sizeof(*rhead))
goto bad;
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 this connection filled our pages, drop our reference now, to
* avoid a (safe but slower) revoke later.
*/
if (req->r_con_filling_pages == con && req->r_pages == msg->pages) {
dout(" got pages, dropping con_filling_pages ref %p\n", con);
req->r_con_filling_pages = NULL;
ceph_con_put(con);
}
if (req->r_reply) {
/*
* once we see the message has been received, we don't
* need a ref (which is only needed for revoking
* pages)
*/
ceph_msg_put(req->r_reply);
req->r_reply = NULL;
}
if (!req->r_got_reply) {
unsigned bytes;
req->r_result = le32_to_cpu(rhead->result);
bytes = le32_to_cpu(msg->hdr.data_len);
dout("handle_reply result %d bytes %d\n", req->r_result,
bytes);
if (req->r_result == 0)
req->r_result = bytes;
/* in case this is a write and we need to replay, */
req->r_reassert_version = rhead->reassert_version;
req->r_got_reply = 1;
} else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
dout("handle_reply tid %llu dup ack\n", tid);
mutex_unlock(&osdc->request_mutex);
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, msg);
else
complete(&req->r_completion);
if (flags & CEPH_OSD_FLAG_ONDISK) {
if (req->r_safe_callback)
req->r_safe_callback(req, msg);
complete(&req->r_safe_completion); /* fsync waiter */
}
done:
ceph_osdc_put_request(req);
return;
bad:
pr_err("corrupt osd_op_reply got %d %d expected %d\n",
(int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
(int)sizeof(*rhead));
ceph_msg_dump(msg);
}
/*
* Resubmit osd requests whose osd or osd address has changed. Request
* a new osd map if osds are down, or we are otherwise unable to determine
* how to direct a request.
*
* Close connections to down osds.
*
* If @who is specified, resubmit requests for that specific osd.
*
* Caller should hold map_sem for read and request_mutex.
*/
static void kick_requests(struct ceph_osd_client *osdc,
struct ceph_osd *kickosd)
{
struct ceph_osd_request *req;
struct rb_node *p, *n;
int needmap = 0;
int err;
dout("kick_requests osd%d\n", kickosd ? kickosd->o_osd : -1);
mutex_lock(&osdc->request_mutex);
if (!kickosd) {
for (p = rb_first(&osdc->osds); p; p = n) {
struct ceph_osd *osd =
rb_entry(p, struct ceph_osd, o_node);
n = rb_next(p);
if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
memcmp(&osd->o_con.peer_addr,
ceph_osd_addr(osdc->osdmap,
osd->o_osd),
sizeof(struct ceph_entity_addr)) != 0)
reset_osd(osdc, osd);
}
}
for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
req = rb_entry(p, struct ceph_osd_request, r_node);
if (req->r_resend) {
dout(" r_resend set on tid %llu\n", req->r_tid);
__cancel_request(req);
goto kick;
}
if (req->r_osd && kickosd == req->r_osd) {
__cancel_request(req);
goto kick;
}
err = __map_osds(osdc, req);
if (err == 0)
continue; /* no change */
if (err < 0) {
/*
* FIXME: really, we should set the request
* error and fail if this isn't a 'nofail'
* request, but that's a fair bit more
* complicated to do. So retry!
*/
dout(" setting r_resend on %llu\n", req->r_tid);
req->r_resend = true;
continue;
}
if (req->r_osd == NULL) {
dout("tid %llu maps to no valid osd\n", req->r_tid);
needmap++; /* request a newer map */
continue;
}
kick:
dout("kicking %p tid %llu osd%d\n", req, req->r_tid,
req->r_osd->o_osd);
req->r_flags |= CEPH_OSD_FLAG_RETRY;
err = __send_request(osdc, req);
if (err) {
dout(" setting r_resend on %llu\n", req->r_tid);
req->r_resend = true;
}
}
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);
}
}
/*
* 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));
if (ceph_check_fsid(osdc->client, &fsid) < 0)
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);
epoch = ceph_decode_32(&p);
maplen = ceph_decode_32(&p);
ceph_decode_need(&p, end, maplen, bad);
next = p + maplen;
if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
dout("applying incremental map %u len %d\n",
epoch, maplen);
newmap = osdmap_apply_incremental(&p, next,
osdc->osdmap,
osdc->client->msgr);
if (IS_ERR(newmap)) {
err = PTR_ERR(newmap);
goto bad;
}
BUG_ON(!newmap);
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);
epoch = ceph_decode_32(&p);
maplen = ceph_decode_32(&p);
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;
}
BUG_ON(!newmap);
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("osdc handle_map corrupt msg\n");
ceph_msg_dump(msg);
up_write(&osdc->map_sem);
return;
}
/*
* 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.
*/
static int prepare_pages(struct ceph_connection *con,
struct ceph_msg_header *hdr,
struct ceph_osd_request *req,
u64 tid,
struct ceph_msg *m)
{
struct ceph_osd *osd = con->private;
struct ceph_osd_client *osdc;
int ret = -1;
int data_len = le32_to_cpu(hdr->data_len);
unsigned data_off = le16_to_cpu(hdr->data_off);
int want = calc_pages_for(data_off & ~PAGE_MASK, data_len);
if (!osd)
return -1;
osdc = osd->o_osdc;
dout("prepare_pages on msg %p want %d\n", m, want);
dout("prepare_pages tid %llu has %d pages, want %d\n",
tid, req->r_num_pages, want);
if (unlikely(req->r_num_pages < want))
goto out;
if (req->r_con_filling_pages) {
dout("revoking pages %p from old con %p\n", req->r_pages,
req->r_con_filling_pages);
ceph_con_revoke_pages(req->r_con_filling_pages, req->r_pages);
ceph_con_put(req->r_con_filling_pages);
}
req->r_con_filling_pages = ceph_con_get(con);
req->r_reply = ceph_msg_get(m); /* for duration of read over socket */
m->pages = req->r_pages;
m->nr_pages = req->r_num_pages;
ret = 0; /* success */
out:
BUG_ON(ret < 0 || m->nr_pages < want);
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 = 0;
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);
mutex_lock(&osdc->request_mutex);
/*
* a racing kick_requests() may have sent the message for us
* while we dropped request_mutex above, so only send now if
* the request still han't been touched yet.
*/
if (req->r_sent == 0) {
rc = __send_request(osdc, req);
if (rc) {
if (nofail) {
dout("osdc_start_request failed send, "
" marking %lld\n", req->r_tid);
req->r_resend = true;
rc = 0;
} else {
__unregister_request(osdc, req);
}
}
}
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
return rc;
}
/*
* 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);
__unregister_request(osdc, req);
mutex_unlock(&osdc->request_mutex);
dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
return rc;
}
dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
return req->r_result;
}
/*
* 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)
{
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->timeout_tid = 0;
osdc->last_tid = 0;
osdc->osds = RB_ROOT;
osdc->requests = RB_ROOT;
osdc->num_requests = 0;
INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
err = -ENOMEM;
osdc->req_mempool = mempool_create_kmalloc_pool(10,
sizeof(struct ceph_osd_request));
if (!osdc->req_mempool)
goto out;
err = ceph_msgpool_init(&osdc->msgpool_op, 4096, 10, true);
if (err < 0)
goto out_mempool;
err = ceph_msgpool_init(&osdc->msgpool_op_reply, 512, 0, false);
if (err < 0)
goto out_msgpool;
return 0;
out_msgpool:
ceph_msgpool_destroy(&osdc->msgpool_op);
out_mempool:
mempool_destroy(osdc->req_mempool);
out:
return err;
}
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);
ceph_msgpool_destroy(&osdc->msgpool_op);
ceph_msgpool_destroy(&osdc->msgpool_op_reply);
}
/*
* 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,
struct page **pages, int num_pages)
{
struct ceph_osd_request *req;
int rc = 0;
dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
vino.snap, off, *plen);
req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
NULL, 0, truncate_seq, truncate_size, NULL,
false, 1);
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, *plen);
req->r_num_pages = num_pages;
dout("readpages final extent is %llu~%llu (%d pages)\n",
off, *plen, req->r_num_pages);
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;
}
/*
* 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, 1);
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;
}
/*
* handle incoming message
*/
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
{
struct ceph_osd *osd = con->private;
struct ceph_osd_client *osdc;
int type = le16_to_cpu(msg->hdr.type);
if (!osd)
return;
osdc = osd->o_osdc;
switch (type) {
case CEPH_MSG_OSD_MAP:
ceph_osdc_handle_map(osdc, msg);
break;
case CEPH_MSG_OSD_OPREPLY:
handle_reply(osdc, msg, con);
break;
default:
pr_err("received unknown message type %d %s\n", type,
ceph_msg_type_name(type));
}
ceph_msg_put(msg);
}
static struct ceph_msg *alloc_msg(struct ceph_connection *con,
struct ceph_msg_header *hdr,
int *skip)
{
struct ceph_osd *osd = con->private;
struct ceph_osd_client *osdc = osd->o_osdc;
int type = le16_to_cpu(hdr->type);
int front = le32_to_cpu(hdr->front_len);
int data_len = le32_to_cpu(hdr->data_len);
struct ceph_msg *m;
struct ceph_osd_request *req;
u64 tid;
int err;
*skip = 0;
if (type != CEPH_MSG_OSD_OPREPLY)
return NULL;
tid = le64_to_cpu(hdr->tid);
mutex_lock(&osdc->request_mutex);
req = __lookup_request(osdc, tid);
if (!req) {
*skip = 1;
m = NULL;
dout("prepare_pages unknown tid %llu\n", tid);
goto out;
}
m = ceph_msgpool_get(&osdc->msgpool_op_reply, front);
if (!m) {
*skip = 1;
goto out;
}
if (data_len > 0) {
err = prepare_pages(con, hdr, req, tid, m);
if (err < 0) {
*skip = 1;
ceph_msg_put(m);
m = ERR_PTR(err);
}
}
out:
mutex_unlock(&osdc->request_mutex);
return m;
}
/*
* 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);
}
/*
* authentication
*/
static int get_authorizer(struct ceph_connection *con,
void **buf, int *len, int *proto,
void **reply_buf, int *reply_len, int force_new)
{
struct ceph_osd *o = con->private;
struct ceph_osd_client *osdc = o->o_osdc;
struct ceph_auth_client *ac = osdc->client->monc.auth;
int ret = 0;
if (force_new && o->o_authorizer) {
ac->ops->destroy_authorizer(ac, o->o_authorizer);
o->o_authorizer = NULL;
}
if (o->o_authorizer == NULL) {
ret = ac->ops->create_authorizer(
ac, CEPH_ENTITY_TYPE_OSD,
&o->o_authorizer,
&o->o_authorizer_buf,
&o->o_authorizer_buf_len,
&o->o_authorizer_reply_buf,
&o->o_authorizer_reply_buf_len);
if (ret)
return ret;
}
*proto = ac->protocol;
*buf = o->o_authorizer_buf;
*len = o->o_authorizer_buf_len;
*reply_buf = o->o_authorizer_reply_buf;
*reply_len = o->o_authorizer_reply_buf_len;
return 0;
}
static int verify_authorizer_reply(struct ceph_connection *con, int len)
{
struct ceph_osd *o = con->private;
struct ceph_osd_client *osdc = o->o_osdc;
struct ceph_auth_client *ac = osdc->client->monc.auth;
return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
}
const static struct ceph_connection_operations osd_con_ops = {
.get = get_osd_con,
.put = put_osd_con,
.dispatch = dispatch,
.get_authorizer = get_authorizer,
.verify_authorizer_reply = verify_authorizer_reply,
.alloc_msg = alloc_msg,
.fault = osd_reset,
};