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osd_client.c
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#include <linux/ceph/ceph_debug.h>
#include <linux/module.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>
#ifdef CONFIG_BLOCK
#include <linux/bio.h>
#endif
#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>
#define OSD_OP_FRONT_LEN 4096
#define OSD_OPREPLY_FRONT_LEN 512
static const struct ceph_connection_operations osd_con_ops;
static void send_queued(struct ceph_osd_client *osdc);
static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
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);
static void __send_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req);
static int op_needs_trail(int op)
{
switch (op) {
case CEPH_OSD_OP_GETXATTR:
case CEPH_OSD_OP_SETXATTR:
case CEPH_OSD_OP_CMPXATTR:
case CEPH_OSD_OP_CALL:
case CEPH_OSD_OP_NOTIFY:
return 1;
default:
return 0;
}
}
static int op_has_extent(int op)
{
return (op == CEPH_OSD_OP_READ ||
op == CEPH_OSD_OP_WRITE);
}
void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
struct ceph_file_layout *layout,
u64 snapid,
u64 off, u64 *plen, u64 *bno,
struct ceph_osd_request *req,
struct ceph_osd_req_op *op)
{
struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
u64 orig_len = *plen;
u64 objoff, objlen; /* extent in object */
reqhead->snapid = cpu_to_le64(snapid);
/* 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);
if (op_has_extent(op->op)) {
op->extent.offset = objoff;
op->extent.length = objlen;
}
req->r_num_pages = calc_pages_for(off, *plen);
req->r_page_alignment = off & ~PAGE_MASK;
if (op->op == CEPH_OSD_OP_WRITE)
op->payload_len = *plen;
dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
*bno, objoff, objlen, req->r_num_pages);
}
EXPORT_SYMBOL(ceph_calc_raw_layout);
/*
* 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_req_op *op)
{
u64 bno;
ceph_calc_raw_layout(osdc, layout, vino.snap, off,
plen, &bno, req, op);
snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno);
req->r_oid_len = strlen(req->r_oid);
}
/*
* 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_msg) {
dout("release_request revoking pages %p from con %p\n",
req->r_pages, req->r_con_filling_msg);
ceph_con_revoke_message(req->r_con_filling_msg,
req->r_reply);
ceph_con_put(req->r_con_filling_msg);
}
if (req->r_own_pages)
ceph_release_page_vector(req->r_pages,
req->r_num_pages);
#ifdef CONFIG_BLOCK
if (req->r_bio)
bio_put(req->r_bio);
#endif
ceph_put_snap_context(req->r_snapc);
if (req->r_trail) {
ceph_pagelist_release(req->r_trail);
kfree(req->r_trail);
}
if (req->r_mempool)
mempool_free(req, req->r_osdc->req_mempool);
else
kfree(req);
}
EXPORT_SYMBOL(ceph_osdc_release_request);
static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail)
{
int i = 0;
if (needs_trail)
*needs_trail = 0;
while (ops[i].op) {
if (needs_trail && op_needs_trail(ops[i].op))
*needs_trail = 1;
i++;
}
return i;
}
struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
int flags,
struct ceph_snap_context *snapc,
struct ceph_osd_req_op *ops,
bool use_mempool,
gfp_t gfp_flags,
struct page **pages,
struct bio *bio)
{
struct ceph_osd_request *req;
struct ceph_msg *msg;
int needs_trail;
int num_op = get_num_ops(ops, &needs_trail);
size_t msg_size = sizeof(struct ceph_osd_request_head);
msg_size += num_op*sizeof(struct ceph_osd_op);
if (use_mempool) {
req = mempool_alloc(osdc->req_mempool, gfp_flags);
memset(req, 0, sizeof(*req));
} else {
req = kzalloc(sizeof(*req), gfp_flags);
}
if (req == NULL)
return NULL;
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);
INIT_LIST_HEAD(&req->r_linger_item);
INIT_LIST_HEAD(&req->r_linger_osd);
INIT_LIST_HEAD(&req->r_req_lru_item);
req->r_flags = flags;
WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
/* create reply message */
if (use_mempool)
msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
else
msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
if (!msg) {
ceph_osdc_put_request(req);
return NULL;
}
req->r_reply = msg;
/* allocate space for the trailing data */
if (needs_trail) {
req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
if (!req->r_trail) {
ceph_osdc_put_request(req);
return NULL;
}
ceph_pagelist_init(req->r_trail);
}
/* create request message; allow space for oid */
msg_size += MAX_OBJ_NAME_SIZE;
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, gfp_flags, true);
if (!msg) {
ceph_osdc_put_request(req);
return NULL;
}
msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
memset(msg->front.iov_base, 0, msg->front.iov_len);
req->r_request = msg;
req->r_pages = pages;
#ifdef CONFIG_BLOCK
if (bio) {
req->r_bio = bio;
bio_get(req->r_bio);
}
#endif
return req;
}
EXPORT_SYMBOL(ceph_osdc_alloc_request);
static void osd_req_encode_op(struct ceph_osd_request *req,
struct ceph_osd_op *dst,
struct ceph_osd_req_op *src)
{
dst->op = cpu_to_le16(src->op);
switch (src->op) {
case CEPH_OSD_OP_READ:
case CEPH_OSD_OP_WRITE:
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_GETXATTR:
case CEPH_OSD_OP_SETXATTR:
case CEPH_OSD_OP_CMPXATTR:
BUG_ON(!req->r_trail);
dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
dst->xattr.cmp_op = src->xattr.cmp_op;
dst->xattr.cmp_mode = src->xattr.cmp_mode;
ceph_pagelist_append(req->r_trail, src->xattr.name,
src->xattr.name_len);
ceph_pagelist_append(req->r_trail, src->xattr.val,
src->xattr.value_len);
break;
case CEPH_OSD_OP_CALL:
BUG_ON(!req->r_trail);
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(req->r_trail, src->cls.class_name,
src->cls.class_len);
ceph_pagelist_append(req->r_trail, src->cls.method_name,
src->cls.method_len);
ceph_pagelist_append(req->r_trail, src->cls.indata,
src->cls.indata_len);
break;
case CEPH_OSD_OP_ROLLBACK:
dst->snap.snapid = cpu_to_le64(src->snap.snapid);
break;
case CEPH_OSD_OP_STARTSYNC:
break;
case CEPH_OSD_OP_NOTIFY:
{
__le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
__le32 timeout = cpu_to_le32(src->watch.timeout);
BUG_ON(!req->r_trail);
ceph_pagelist_append(req->r_trail,
&prot_ver, sizeof(prot_ver));
ceph_pagelist_append(req->r_trail,
&timeout, sizeof(timeout));
}
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:
pr_err("unrecognized osd opcode %d\n", dst->op);
WARN_ON(1);
break;
}
dst->payload_len = cpu_to_le32(src->payload_len);
}
/*
* build new request AND message
*
*/
void ceph_osdc_build_request(struct ceph_osd_request *req,
u64 off, u64 *plen,
struct ceph_osd_req_op *src_ops,
struct ceph_snap_context *snapc,
struct timespec *mtime,
const char *oid,
int oid_len)
{
struct ceph_msg *msg = req->r_request;
struct ceph_osd_request_head *head;
struct ceph_osd_req_op *src_op;
struct ceph_osd_op *op;
void *p;
int num_op = get_num_ops(src_ops, NULL);
size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
int flags = req->r_flags;
u64 data_len = 0;
int i;
head = msg->front.iov_base;
op = (void *)(head + 1);
p = (void *)(op + num_op);
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);
/* fill in oid */
head->object_len = cpu_to_le32(oid_len);
memcpy(p, oid, oid_len);
p += oid_len;
src_op = src_ops;
while (src_op->op) {
osd_req_encode_op(req, op, src_op);
src_op++;
op++;
}
if (req->r_trail)
data_len += req->r_trail->length;
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);
}
}
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 + data_len);
} else if (data_len) {
req->r_request->hdr.data_off = 0;
req->r_request->hdr.data_len = cpu_to_le32(data_len);
}
req->r_request->page_alignment = req->r_page_alignment;
BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
msg_size = p - msg->front.iov_base;
msg->front.iov_len = msg_size;
msg->hdr.front_len = cpu_to_le32(msg_size);
return;
}
EXPORT_SYMBOL(ceph_osdc_build_request);
/*
* 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,
int page_align)
{
struct ceph_osd_req_op ops[3];
struct ceph_osd_request *req;
ops[0].op = opcode;
ops[0].extent.truncate_seq = truncate_seq;
ops[0].extent.truncate_size = truncate_size;
ops[0].payload_len = 0;
if (do_sync) {
ops[1].op = CEPH_OSD_OP_STARTSYNC;
ops[1].payload_len = 0;
ops[2].op = 0;
} else
ops[1].op = 0;
req = ceph_osdc_alloc_request(osdc, flags,
snapc, ops,
use_mempool,
GFP_NOFS, NULL, NULL);
if (!req)
return NULL;
/* calculate max write size */
calc_layout(osdc, vino, layout, off, plen, req, ops);
req->r_file_layout = *layout; /* keep a copy */
/* in case it differs from natural (file) alignment that
calc_layout filled in for us */
req->r_num_pages = calc_pages_for(page_align, *plen);
req->r_page_alignment = page_align;
ceph_osdc_build_request(req, off, plen, ops,
snapc,
mtime,
req->r_oid, req->r_oid_len);
return req;
}
EXPORT_SYMBOL(ceph_osdc_new_request);
/*
* 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;
}
/*
* Resubmit requests pending on the given osd.
*/
static void __kick_osd_requests(struct ceph_osd_client *osdc,
struct ceph_osd *osd)
{
struct ceph_osd_request *req, *nreq;
int err;
dout("__kick_osd_requests osd%d\n", osd->o_osd);
err = __reset_osd(osdc, osd);
if (err == -EAGAIN)
return;
list_for_each_entry(req, &osd->o_requests, r_osd_item) {
list_move(&req->r_req_lru_item, &osdc->req_unsent);
dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
osd->o_osd);
if (!req->r_linger)
req->r_flags |= CEPH_OSD_FLAG_RETRY;
}
list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
r_linger_osd) {
/*
* reregister request prior to unregistering linger so
* that r_osd is preserved.
*/
BUG_ON(!list_empty(&req->r_req_lru_item));
__register_request(osdc, req);
list_add(&req->r_req_lru_item, &osdc->req_unsent);
list_add(&req->r_osd_item, &req->r_osd->o_requests);
__unregister_linger_request(osdc, req);
dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
osd->o_osd);
}
}
static void kick_osd_requests(struct ceph_osd_client *osdc,
struct ceph_osd *kickosd)
{
mutex_lock(&osdc->request_mutex);
__kick_osd_requests(osdc, kickosd);
mutex_unlock(&osdc->request_mutex);
}
/*
* 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;
down_read(&osdc->map_sem);
kick_osd_requests(osdc, osd);
send_queued(osdc);
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);
INIT_LIST_HEAD(&osd->o_linger_requests);
INIT_LIST_HEAD(&osd->o_osd_lru);
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;
INIT_LIST_HEAD(&osd->o_keepalive_item);
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) && osd->o_auth.authorizer) {
struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
if (ac->ops && ac->ops->destroy_authorizer)
ac->ops->destroy_authorizer(ac, osd->o_auth.authorizer);
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);
list_del_init(&osd->o_osd_lru);
ceph_con_close(&osd->o_con);
put_osd(osd);
}
static void remove_all_osds(struct ceph_osd_client *osdc)
{
dout("__remove_old_osds %p\n", osdc);
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);
}
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);
osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
}
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);
}
static void remove_old_osds(struct ceph_osd_client *osdc)
{
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) {
if (time_before(jiffies, osd->lru_ttl))
break;
__remove_osd(osdc, osd);
}
mutex_unlock(&osdc->request_mutex);
}
/*
* reset osd connect
*/
static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
{
struct ceph_osd_request *req;
int ret = 0;
dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
if (list_empty(&osd->o_requests) &&
list_empty(&osd->o_linger_requests)) {
__remove_osd(osdc, osd);
} else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
&osd->o_con.peer_addr,
sizeof(osd->o_con.peer_addr)) == 0 &&
!ceph_con_opened(&osd->o_con)) {
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;
ret = -EAGAIN;
} 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;
dout("__insert_osd %p osd%d\n", new, new->o_osd);
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;
}
static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
{
schedule_delayed_work(&osdc->timeout_work,
osdc->client->options->osd_keepalive_timeout * HZ);
}
static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
{
cancel_delayed_work(&osdc->timeout_work);
}
/*
* 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)
{
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++;
if (osdc->num_requests == 1) {
dout(" first request, scheduling timeout\n");
__schedule_osd_timeout(osdc);
}
}
static void register_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
mutex_lock(&osdc->request_mutex);
__register_request(osdc, req);
mutex_unlock(&osdc->request_mutex);
}
/*
* called under osdc->request_mutex
*/
static void __unregister_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
if (RB_EMPTY_NODE(&req->r_node)) {
dout("__unregister_request %p tid %lld not registered\n",
req, req->r_tid);
return;
}
dout("__unregister_request %p tid %lld\n", req, req->r_tid);
rb_erase(&req->r_node, &osdc->requests);
osdc->num_requests--;
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) &&
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);
}
if (list_empty(&req->r_linger_item))
req->r_osd = NULL;
}
ceph_osdc_put_request(req);
list_del_init(&req->r_req_lru_item);
if (osdc->num_requests == 0) {
dout(" no requests, canceling timeout\n");
__cancel_osd_timeout(osdc);
}
}
/*
* Cancel a previously queued request message
*/
static void __cancel_request(struct ceph_osd_request *req)
{
if (req->r_sent && req->r_osd) {
ceph_con_revoke(&req->r_osd->o_con, req->r_request);
req->r_sent = 0;
}
}
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);
list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
}
static void __unregister_linger_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
dout("__unregister_linger_request %p\n", req);
if (req->r_osd) {
list_del_init(&req->r_linger_item);
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);
}
if (list_empty(&req->r_osd_item))
req->r_osd = NULL;
}
}
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);
/*
* 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. Move the request to the appropriate list
* (unsent, homeless) or leave on in-flight lru.
*
* Return 0 if unchanged, 1 if changed, or negative on error.
*
* Caller should hold map_sem for read and request_mutex.
*/
static int __map_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req, int force_resend)
{
struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
struct ceph_pg pgid;
int acting[CEPH_PG_MAX_SIZE];
int o = -1, num = 0;
int err;
dout("map_request %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) {
list_move(&req->r_req_lru_item, &osdc->req_notarget);
return err;
}
pgid = reqhead->layout.ol_pgid;
req->r_pgid = pgid;
err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
if (err > 0) {
o = acting[0];
num = err;
}
if ((!force_resend &&
req->r_osd && req->r_osd->o_osd == o &&
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) ||
(req->r_osd == NULL && o == -1))
return 0; /* no change */
dout("map_request 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);
/* record full pg acting set */
memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
req->r_num_pg_osds = num;
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) {
err = -ENOMEM;