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linux/net/ceph/osd_client.c
Ilya Dryomov 583d0fef75 libceph: clear msg->con in ceph_msg_release() only 
The following bit in ceph_msg_revoke_incoming() is unsafe:

    struct ceph_connection *con = msg->con;
    if (!con)
            return;
    mutex_lock(&con->mutex);
    <more msg->con use>

There is nothing preventing con from getting destroyed right after
msg->con test.  One easy way to reproduce this is to disable message
signing only on the server side and try to map an image.  The system
will go into a

    libceph: read_partial_message ffff880073f0ab68 signature check failed
    libceph: osd0 192.168.255.155:6801 bad crc/signature
    libceph: read_partial_message ffff880073f0ab68 signature check failed
    libceph: osd0 192.168.255.155:6801 bad crc/signature

loop which has to be interrupted with Ctrl-C.  Hit Ctrl-C and you are
likely to end up with a random GP fault if the reset handler executes
"within" ceph_msg_revoke_incoming():

                     <yet another reply w/o a signature>
                                   ...
          <Ctrl-C>
    rbd_obj_request_end
      ceph_osdc_cancel_request
        __unregister_request
          ceph_osdc_put_request
            ceph_msg_revoke_incoming
                                   ...
                                osd_reset
                                  __kick_osd_requests
                                    __reset_osd
                                      remove_osd
                                        ceph_con_close
                                          reset_connection
                                            <clear con->in_msg->con>
                                            <put con ref>
                                              put_osd
                                                <free osd/con>
              <msg->con use> <-- !!!

If ceph_msg_revoke_incoming() executes "before" the reset handler,
osd/con will be leaked because ceph_msg_revoke_incoming() clears
con->in_msg but doesn't put con ref, while reset_connection() only puts
con ref if con->in_msg != NULL.

The current msg->con scheme was introduced by commits 38941f8031
("libceph: have messages point to their connection") and 92ce034b5a
("libceph: have messages take a connection reference"), which defined
when messages get associated with a connection and when that
association goes away.  Part of the problem is that this association is
supposed to go away in much too many places; closing this race entirely
requires either a rework of the existing or an addition of a new layer
of synchronization.

In lieu of that, we can make it *much* less likely to hit by
disassociating messages only on their destruction and resend through
a different connection.  This makes the code simpler and is probably
a good thing to do regardless - this patch adds a msg_con_set() helper
which is is called from only three places: ceph_con_send() and
ceph_con_in_msg_alloc() to set msg->con and ceph_msg_release() to clear
it.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2015-11-02 23:37:46 +01:00

3007 lines
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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 struct kmem_cache *ceph_osd_request_cache;
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_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 __enqueue_request(struct ceph_osd_request *req);
static void __send_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req);
/*
* 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 int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
u64 *objnum, u64 *objoff, u64 *objlen)
{
u64 orig_len = *plen;
int r;
/* object extent? */
r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
objoff, objlen);
if (r < 0)
return r;
if (*objlen < orig_len) {
*plen = *objlen;
dout(" skipping last %llu, final file extent %llu~%llu\n",
orig_len - *plen, off, *plen);
}
dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
return 0;
}
static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
{
memset(osd_data, 0, sizeof (*osd_data));
osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
}
static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
struct page **pages, u64 length, u32 alignment,
bool pages_from_pool, bool own_pages)
{
osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
osd_data->pages = pages;
osd_data->length = length;
osd_data->alignment = alignment;
osd_data->pages_from_pool = pages_from_pool;
osd_data->own_pages = own_pages;
}
static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
struct ceph_pagelist *pagelist)
{
osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
osd_data->pagelist = pagelist;
}
#ifdef CONFIG_BLOCK
static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
struct bio *bio, size_t bio_length)
{
osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
osd_data->bio = bio;
osd_data->bio_length = bio_length;
}
#endif /* CONFIG_BLOCK */
#define osd_req_op_data(oreq, whch, typ, fld) \
({ \
struct ceph_osd_request *__oreq = (oreq); \
unsigned int __whch = (whch); \
BUG_ON(__whch >= __oreq->r_num_ops); \
&__oreq->r_ops[__whch].typ.fld; \
})
static struct ceph_osd_data *
osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
{
BUG_ON(which >= osd_req->r_num_ops);
return &osd_req->r_ops[which].raw_data_in;
}
struct ceph_osd_data *
osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
unsigned int which)
{
return osd_req_op_data(osd_req, which, extent, osd_data);
}
EXPORT_SYMBOL(osd_req_op_extent_osd_data);
struct ceph_osd_data *
osd_req_op_cls_response_data(struct ceph_osd_request *osd_req,
unsigned int which)
{
return osd_req_op_data(osd_req, which, cls, response_data);
}
EXPORT_SYMBOL(osd_req_op_cls_response_data); /* ??? */
void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
unsigned int which, struct page **pages,
u64 length, u32 alignment,
bool pages_from_pool, bool own_pages)
{
struct ceph_osd_data *osd_data;
osd_data = osd_req_op_raw_data_in(osd_req, which);
ceph_osd_data_pages_init(osd_data, pages, length, alignment,
pages_from_pool, own_pages);
}
EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
unsigned int which, struct page **pages,
u64 length, u32 alignment,
bool pages_from_pool, bool own_pages)
{
struct ceph_osd_data *osd_data;
osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
ceph_osd_data_pages_init(osd_data, pages, length, alignment,
pages_from_pool, own_pages);
}
EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
unsigned int which, struct ceph_pagelist *pagelist)
{
struct ceph_osd_data *osd_data;
osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
ceph_osd_data_pagelist_init(osd_data, pagelist);
}
EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
#ifdef CONFIG_BLOCK
void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
unsigned int which, struct bio *bio, size_t bio_length)
{
struct ceph_osd_data *osd_data;
osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
ceph_osd_data_bio_init(osd_data, bio, bio_length);
}
EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
#endif /* CONFIG_BLOCK */
static void osd_req_op_cls_request_info_pagelist(
struct ceph_osd_request *osd_req,
unsigned int which, struct ceph_pagelist *pagelist)
{
struct ceph_osd_data *osd_data;
osd_data = osd_req_op_data(osd_req, which, cls, request_info);
ceph_osd_data_pagelist_init(osd_data, pagelist);
}
void osd_req_op_cls_request_data_pagelist(
struct ceph_osd_request *osd_req,
unsigned int which, struct ceph_pagelist *pagelist)
{
struct ceph_osd_data *osd_data;
osd_data = osd_req_op_data(osd_req, which, cls, request_data);
ceph_osd_data_pagelist_init(osd_data, pagelist);
}
EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
unsigned int which, struct page **pages, u64 length,
u32 alignment, bool pages_from_pool, bool own_pages)
{
struct ceph_osd_data *osd_data;
osd_data = osd_req_op_data(osd_req, which, cls, request_data);
ceph_osd_data_pages_init(osd_data, pages, length, alignment,
pages_from_pool, own_pages);
}
EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
unsigned int which, struct page **pages, u64 length,
u32 alignment, bool pages_from_pool, bool own_pages)
{
struct ceph_osd_data *osd_data;
osd_data = osd_req_op_data(osd_req, which, cls, response_data);
ceph_osd_data_pages_init(osd_data, pages, length, alignment,
pages_from_pool, own_pages);
}
EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
{
switch (osd_data->type) {
case CEPH_OSD_DATA_TYPE_NONE:
return 0;
case CEPH_OSD_DATA_TYPE_PAGES:
return osd_data->length;
case CEPH_OSD_DATA_TYPE_PAGELIST:
return (u64)osd_data->pagelist->length;
#ifdef CONFIG_BLOCK
case CEPH_OSD_DATA_TYPE_BIO:
return (u64)osd_data->bio_length;
#endif /* CONFIG_BLOCK */
default:
WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
return 0;
}
}
static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
{
if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
int num_pages;
num_pages = calc_pages_for((u64)osd_data->alignment,
(u64)osd_data->length);
ceph_release_page_vector(osd_data->pages, num_pages);
}
ceph_osd_data_init(osd_data);
}
static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
unsigned int which)
{
struct ceph_osd_req_op *op;
BUG_ON(which >= osd_req->r_num_ops);
op = &osd_req->r_ops[which];
switch (op->op) {
case CEPH_OSD_OP_READ:
case CEPH_OSD_OP_WRITE:
case CEPH_OSD_OP_WRITEFULL:
ceph_osd_data_release(&op->extent.osd_data);
break;
case CEPH_OSD_OP_CALL:
ceph_osd_data_release(&op->cls.request_info);
ceph_osd_data_release(&op->cls.request_data);
ceph_osd_data_release(&op->cls.response_data);
break;
case CEPH_OSD_OP_SETXATTR:
case CEPH_OSD_OP_CMPXATTR:
ceph_osd_data_release(&op->xattr.osd_data);
break;
case CEPH_OSD_OP_STAT:
ceph_osd_data_release(&op->raw_data_in);
break;
default:
break;
}
}
/*
* requests
*/
static void ceph_osdc_release_request(struct kref *kref)
{
struct ceph_osd_request *req = container_of(kref,
struct ceph_osd_request, r_kref);
unsigned int which;
dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
req->r_request, req->r_reply);
WARN_ON(!RB_EMPTY_NODE(&req->r_node));
WARN_ON(!list_empty(&req->r_req_lru_item));
WARN_ON(!list_empty(&req->r_osd_item));
WARN_ON(!list_empty(&req->r_linger_item));
WARN_ON(!list_empty(&req->r_linger_osd_item));
WARN_ON(req->r_osd);
if (req->r_request)
ceph_msg_put(req->r_request);
if (req->r_reply) {
ceph_msg_revoke_incoming(req->r_reply);
ceph_msg_put(req->r_reply);
}
for (which = 0; which < req->r_num_ops; which++)
osd_req_op_data_release(req, which);
ceph_put_snap_context(req->r_snapc);
if (req->r_mempool)
mempool_free(req, req->r_osdc->req_mempool);
else
kmem_cache_free(ceph_osd_request_cache, req);
}
void ceph_osdc_get_request(struct ceph_osd_request *req)
{
dout("%s %p (was %d)\n", __func__, req,
atomic_read(&req->r_kref.refcount));
kref_get(&req->r_kref);
}
EXPORT_SYMBOL(ceph_osdc_get_request);
void ceph_osdc_put_request(struct ceph_osd_request *req)
{
dout("%s %p (was %d)\n", __func__, req,
atomic_read(&req->r_kref.refcount));
kref_put(&req->r_kref, ceph_osdc_release_request);
}
EXPORT_SYMBOL(ceph_osdc_put_request);
struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
struct ceph_snap_context *snapc,
unsigned int num_ops,
bool use_mempool,
gfp_t gfp_flags)
{
struct ceph_osd_request *req;
struct ceph_msg *msg;
size_t msg_size;
BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX);
BUG_ON(num_ops > CEPH_OSD_MAX_OP);
msg_size = 4 + 4 + 8 + 8 + 4+8;
msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
msg_size += 1 + 8 + 4 + 4; /* pg_t */
msg_size += 4 + CEPH_MAX_OID_NAME_LEN; /* oid */
msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
msg_size += 8; /* snapid */
msg_size += 8; /* snap_seq */
msg_size += 8 * (snapc ? snapc->num_snaps : 0); /* snaps */
msg_size += 4;
if (use_mempool) {
req = mempool_alloc(osdc->req_mempool, gfp_flags);
memset(req, 0, sizeof(*req));
} else {
req = kmem_cache_zalloc(ceph_osd_request_cache, gfp_flags);
}
if (req == NULL)
return NULL;
req->r_osdc = osdc;
req->r_mempool = use_mempool;
req->r_num_ops = num_ops;
kref_init(&req->r_kref);
init_completion(&req->r_completion);
init_completion(&req->r_safe_completion);
RB_CLEAR_NODE(&req->r_node);
INIT_LIST_HEAD(&req->r_unsafe_item);
INIT_LIST_HEAD(&req->r_linger_item);
INIT_LIST_HEAD(&req->r_linger_osd_item);
INIT_LIST_HEAD(&req->r_req_lru_item);
INIT_LIST_HEAD(&req->r_osd_item);
req->r_base_oloc.pool = -1;
req->r_target_oloc.pool = -1;
/* 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;
/* create request message; allow space for oid */
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;
}
memset(msg->front.iov_base, 0, msg->front.iov_len);
req->r_request = msg;
return req;
}
EXPORT_SYMBOL(ceph_osdc_alloc_request);
static bool osd_req_opcode_valid(u16 opcode)
{
switch (opcode) {
#define GENERATE_CASE(op, opcode, str) case CEPH_OSD_OP_##op: return true;
__CEPH_FORALL_OSD_OPS(GENERATE_CASE)
#undef GENERATE_CASE
default:
return false;
}
}
/*
* This is an osd op init function for opcodes that have no data or
* other information associated with them. It also serves as a
* common init routine for all the other init functions, below.
*/
static struct ceph_osd_req_op *
_osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
u16 opcode, u32 flags)
{
struct ceph_osd_req_op *op;
BUG_ON(which >= osd_req->r_num_ops);
BUG_ON(!osd_req_opcode_valid(opcode));
op = &osd_req->r_ops[which];
memset(op, 0, sizeof (*op));
op->op = opcode;
op->flags = flags;
return op;
}
void osd_req_op_init(struct ceph_osd_request *osd_req,
unsigned int which, u16 opcode, u32 flags)
{
(void)_osd_req_op_init(osd_req, which, opcode, flags);
}
EXPORT_SYMBOL(osd_req_op_init);
void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
unsigned int which, u16 opcode,
u64 offset, u64 length,
u64 truncate_size, u32 truncate_seq)
{
struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
opcode, 0);
size_t payload_len = 0;
BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
opcode != CEPH_OSD_OP_WRITEFULL && opcode != CEPH_OSD_OP_ZERO &&
opcode != CEPH_OSD_OP_TRUNCATE);
op->extent.offset = offset;
op->extent.length = length;
op->extent.truncate_size = truncate_size;
op->extent.truncate_seq = truncate_seq;
if (opcode == CEPH_OSD_OP_WRITE || opcode == CEPH_OSD_OP_WRITEFULL)
payload_len += length;
op->payload_len = payload_len;
}
EXPORT_SYMBOL(osd_req_op_extent_init);
void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
unsigned int which, u64 length)
{
struct ceph_osd_req_op *op;
u64 previous;
BUG_ON(which >= osd_req->r_num_ops);
op = &osd_req->r_ops[which];
previous = op->extent.length;
if (length == previous)
return; /* Nothing to do */
BUG_ON(length > previous);
op->extent.length = length;
op->payload_len -= previous - length;
}
EXPORT_SYMBOL(osd_req_op_extent_update);
void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
u16 opcode, const char *class, const char *method)
{
struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
opcode, 0);
struct ceph_pagelist *pagelist;
size_t payload_len = 0;
size_t size;
BUG_ON(opcode != CEPH_OSD_OP_CALL);
pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
BUG_ON(!pagelist);
ceph_pagelist_init(pagelist);
op->cls.class_name = class;
size = strlen(class);
BUG_ON(size > (size_t) U8_MAX);
op->cls.class_len = size;
ceph_pagelist_append(pagelist, class, size);
payload_len += size;
op->cls.method_name = method;
size = strlen(method);
BUG_ON(size > (size_t) U8_MAX);
op->cls.method_len = size;
ceph_pagelist_append(pagelist, method, size);
payload_len += size;
osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
op->cls.argc = 0; /* currently unused */
op->payload_len = payload_len;
}
EXPORT_SYMBOL(osd_req_op_cls_init);
int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
u16 opcode, const char *name, const void *value,
size_t size, u8 cmp_op, u8 cmp_mode)
{
struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
opcode, 0);
struct ceph_pagelist *pagelist;
size_t payload_len;
BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
if (!pagelist)
return -ENOMEM;
ceph_pagelist_init(pagelist);
payload_len = strlen(name);
op->xattr.name_len = payload_len;
ceph_pagelist_append(pagelist, name, payload_len);
op->xattr.value_len = size;
ceph_pagelist_append(pagelist, value, size);
payload_len += size;
op->xattr.cmp_op = cmp_op;
op->xattr.cmp_mode = cmp_mode;
ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
op->payload_len = payload_len;
return 0;
}
EXPORT_SYMBOL(osd_req_op_xattr_init);
void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
unsigned int which, u16 opcode,
u64 cookie, u64 version, int flag)
{
struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
opcode, 0);
BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
op->watch.cookie = cookie;
op->watch.ver = version;
if (opcode == CEPH_OSD_OP_WATCH && flag)
op->watch.flag = (u8)1;
}
EXPORT_SYMBOL(osd_req_op_watch_init);
void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
unsigned int which,
u64 expected_object_size,
u64 expected_write_size)
{
struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
CEPH_OSD_OP_SETALLOCHINT,
0);
op->alloc_hint.expected_object_size = expected_object_size;
op->alloc_hint.expected_write_size = expected_write_size;
/*
* CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
* not worth a feature bit. Set FAILOK per-op flag to make
* sure older osds don't trip over an unsupported opcode.
*/
op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
}
EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
struct ceph_osd_data *osd_data)
{
u64 length = ceph_osd_data_length(osd_data);
if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
BUG_ON(length > (u64) SIZE_MAX);
if (length)
ceph_msg_data_add_pages(msg, osd_data->pages,
length, osd_data->alignment);
} else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
BUG_ON(!length);
ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
#ifdef CONFIG_BLOCK
} else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
ceph_msg_data_add_bio(msg, osd_data->bio, length);
#endif
} else {
BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
}
}
static u64 osd_req_encode_op(struct ceph_osd_request *req,
struct ceph_osd_op *dst, unsigned int which)
{
struct ceph_osd_req_op *src;
struct ceph_osd_data *osd_data;
u64 request_data_len = 0;
u64 data_length;
BUG_ON(which >= req->r_num_ops);
src = &req->r_ops[which];
if (WARN_ON(!osd_req_opcode_valid(src->op))) {
pr_err("unrecognized osd opcode %d\n", src->op);
return 0;
}
switch (src->op) {
case CEPH_OSD_OP_STAT:
osd_data = &src->raw_data_in;
ceph_osdc_msg_data_add(req->r_reply, osd_data);
break;
case CEPH_OSD_OP_READ:
case CEPH_OSD_OP_WRITE:
case CEPH_OSD_OP_WRITEFULL:
case CEPH_OSD_OP_ZERO:
case CEPH_OSD_OP_TRUNCATE:
if (src->op == CEPH_OSD_OP_WRITE ||
src->op == CEPH_OSD_OP_WRITEFULL)
request_data_len = src->extent.length;
dst->extent.offset = cpu_to_le64(src->extent.offset);
dst->extent.length = cpu_to_le64(src->extent.length);
dst->extent.truncate_size =
cpu_to_le64(src->extent.truncate_size);
dst->extent.truncate_seq =
cpu_to_le32(src->extent.truncate_seq);
osd_data = &src->extent.osd_data;
if (src->op == CEPH_OSD_OP_WRITE ||
src->op == CEPH_OSD_OP_WRITEFULL)
ceph_osdc_msg_data_add(req->r_request, osd_data);
else
ceph_osdc_msg_data_add(req->r_reply, osd_data);
break;
case CEPH_OSD_OP_CALL:
dst->cls.class_len = src->cls.class_len;
dst->cls.method_len = src->cls.method_len;
osd_data = &src->cls.request_info;
ceph_osdc_msg_data_add(req->r_request, osd_data);
BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
request_data_len = osd_data->pagelist->length;
osd_data = &src->cls.request_data;
data_length = ceph_osd_data_length(osd_data);
if (data_length) {
BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
dst->cls.indata_len = cpu_to_le32(data_length);
ceph_osdc_msg_data_add(req->r_request, osd_data);
src->payload_len += data_length;
request_data_len += data_length;
}
osd_data = &src->cls.response_data;
ceph_osdc_msg_data_add(req->r_reply, osd_data);
break;
case CEPH_OSD_OP_STARTSYNC:
break;
case CEPH_OSD_OP_NOTIFY_ACK:
case CEPH_OSD_OP_WATCH:
dst->watch.cookie = cpu_to_le64(src->watch.cookie);
dst->watch.ver = cpu_to_le64(src->watch.ver);
dst->watch.flag = src->watch.flag;
break;
case CEPH_OSD_OP_SETALLOCHINT:
dst->alloc_hint.expected_object_size =
cpu_to_le64(src->alloc_hint.expected_object_size);
dst->alloc_hint.expected_write_size =
cpu_to_le64(src->alloc_hint.expected_write_size);
break;
case CEPH_OSD_OP_SETXATTR:
case CEPH_OSD_OP_CMPXATTR:
dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
dst->xattr.cmp_op = src->xattr.cmp_op;
dst->xattr.cmp_mode = src->xattr.cmp_mode;
osd_data = &src->xattr.osd_data;
ceph_osdc_msg_data_add(req->r_request, osd_data);
request_data_len = osd_data->pagelist->length;
break;
case CEPH_OSD_OP_CREATE:
case CEPH_OSD_OP_DELETE:
break;
default:
pr_err("unsupported osd opcode %s\n",
ceph_osd_op_name(src->op));
WARN_ON(1);
return 0;
}
dst->op = cpu_to_le16(src->op);
dst->flags = cpu_to_le32(src->flags);
dst->payload_len = cpu_to_le32(src->payload_len);
return request_data_len;
}
/*
* 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,
unsigned int which, int num_ops,
int opcode, int flags,
struct ceph_snap_context *snapc,
u32 truncate_seq,
u64 truncate_size,
bool use_mempool)
{
struct ceph_osd_request *req;
u64 objnum = 0;
u64 objoff = 0;
u64 objlen = 0;
int r;
BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
GFP_NOFS);
if (!req)
return ERR_PTR(-ENOMEM);
req->r_flags = flags;
/* calculate max write size */
r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
if (r < 0) {
ceph_osdc_put_request(req);
return ERR_PTR(r);
}
if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
osd_req_op_init(req, which, opcode, 0);
} else {
u32 object_size = le32_to_cpu(layout->fl_object_size);
u32 object_base = off - objoff;
if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
if (truncate_size <= object_base) {
truncate_size = 0;
} else {
truncate_size -= object_base;
if (truncate_size > object_size)
truncate_size = object_size;
}
}
osd_req_op_extent_init(req, which, opcode, objoff, objlen,
truncate_size, truncate_seq);
}
req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout);
snprintf(req->r_base_oid.name, sizeof(req->r_base_oid.name),
"%llx.%08llx", vino.ino, objnum);
req->r_base_oid.name_len = strlen(req->r_base_oid.name);
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;
}
static void __kick_linger_request(struct ceph_osd_request *req)
{
struct ceph_osd_client *osdc = req->r_osdc;
struct ceph_osd *osd = req->r_osd;
/*
* Linger requests need to be resent with a new tid to avoid
* the dup op detection logic on the OSDs. Achieve this with
* a re-register dance instead of open-coding.
*/
ceph_osdc_get_request(req);
if (!list_empty(&req->r_linger_item))
__unregister_linger_request(osdc, req);
else
__unregister_request(osdc, req);
__register_request(osdc, req);
ceph_osdc_put_request(req);
/*
* Unless request has been registered as both normal and
* lingering, __unregister{,_linger}_request clears r_osd.
* However, here we need to preserve r_osd to make sure we
* requeue on the same OSD.
*/
WARN_ON(req->r_osd || !osd);
req->r_osd = osd;
dout("%s requeueing %p tid %llu\n", __func__, req, req->r_tid);
__enqueue_request(req);
}
/*
* 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;
LIST_HEAD(resend);
LIST_HEAD(resend_linger);
int err;
dout("%s osd%d\n", __func__, osd->o_osd);
err = __reset_osd(osdc, osd);
if (err)
return;
/*
* Build up a list of requests to resend by traversing the
* osd's list of requests. Requests for a given object are
* sent in tid order, and that is also the order they're
* kept on this list. Therefore all requests that are in
* flight will be found first, followed by all requests that
* have not yet been sent. And to resend requests while
* preserving this order we will want to put any sent
* requests back on the front of the osd client's unsent
* list.
*
* So we build a separate ordered list of already-sent
* requests for the affected osd and splice it onto the
* front of the osd client's unsent list. Once we've seen a
* request that has not yet been sent we're done. Those
* requests are already sitting right where they belong.
*/
list_for_each_entry(req, &osd->o_requests, r_osd_item) {
if (!req->r_sent)
break;
if (!req->r_linger) {
dout("%s requeueing %p tid %llu\n", __func__, req,
req->r_tid);
list_move_tail(&req->r_req_lru_item, &resend);
req->r_flags |= CEPH_OSD_FLAG_RETRY;
} else {
list_move_tail(&req->r_req_lru_item, &resend_linger);
}
}
list_splice(&resend, &osdc->req_unsent);
/*
* Both registered and not yet registered linger requests are
* enqueued with a new tid on the same OSD. We add/move them
* to req_unsent/o_requests at the end to keep things in tid
* order.
*/
list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
r_linger_osd_item) {
WARN_ON(!list_empty(&req->r_req_lru_item));
__kick_linger_request(req);
}
list_for_each_entry_safe(req, nreq, &resend_linger, r_req_lru_item)
__kick_linger_request(req);
}
/*
* 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);
mutex_lock(&osdc->request_mutex);
__kick_osd_requests(osdc, osd);
__send_queued(osdc);
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
}
/*
* Track open sessions with osds.
*/
static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
{
struct ceph_osd *osd;
osd = kzalloc(sizeof(*osd), GFP_NOFS);
if (!osd)
return NULL;
atomic_set(&osd->o_ref, 1);
osd->o_osdc = osdc;
osd->o_osd = onum;
RB_CLEAR_NODE(&osd->o_node);
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(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
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)) {
struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
if (osd->o_auth.authorizer)
ceph_auth_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("%s %p osd%d\n", __func__, osd, osd->o_osd);
WARN_ON(!list_empty(&osd->o_requests));
WARN_ON(!list_empty(&osd->o_linger_requests));
list_del_init(&osd->o_osd_lru);
rb_erase(&osd->o_node, &osdc->osds);
RB_CLEAR_NODE(&osd->o_node);
}
static void remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
{
dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
if (!RB_EMPTY_NODE(&osd->o_node)) {
ceph_con_close(&osd->o_con);
__remove_osd(osdc, osd);
put_osd(osd);
}
}
static void remove_all_osds(struct ceph_osd_client *osdc)
{
dout("%s %p\n", __func__, 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("%s %p\n", __func__, 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;
}
static void maybe_move_osd_to_lru(struct ceph_osd_client *osdc,
struct ceph_osd *osd)
{
dout("%s %p\n", __func__, osd);
if (list_empty(&osd->o_requests) &&
list_empty(&osd->o_linger_requests))
__move_osd_to_lru(osdc, osd);
}
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_entity_addr *peer_addr;
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);
return -ENODEV;
}
peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
!ceph_con_opened(&osd->o_con)) {
struct ceph_osd_request *req;
dout("osd addr hasn't changed and connection never opened, "
"letting msgr retry\n");
/* touch each r_stamp for handle_timeout()'s benfit */
list_for_each_entry(req, &osd->o_requests, r_osd_item)
req->r_stamp = jiffies;
return -EAGAIN;
}
ceph_con_close(&osd->o_con);
ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
osd->o_incarnation++;
return 0;
}
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);
}
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);
}
}
/*
* 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);
RB_CLEAR_NODE(&req->r_node);
osdc->num_requests--;
if (req->r_osd) {
/* make sure the original request isn't in flight. */
ceph_msg_revoke(req->r_request);
list_del_init(&req->r_osd_item);
maybe_move_osd_to_lru(osdc, req->r_osd);
if (list_empty(&req->r_linger_osd_item))
req->r_osd = NULL;
}
list_del_init(&req->r_req_lru_item);
ceph_osdc_put_request(req);
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_msg_revoke(req->r_request);
req->r_sent = 0;
}
}
static void __register_linger_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
dout("%s %p tid %llu\n", __func__, req, req->r_tid);
WARN_ON(!req->r_linger);
ceph_osdc_get_request(req);
list_add_tail(&req->r_linger_item, &osdc->req_linger);
if (req->r_osd)
list_add_tail(&req->r_linger_osd_item,
&req->r_osd->o_linger_requests);
}
static void __unregister_linger_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
WARN_ON(!req->r_linger);
if (list_empty(&req->r_linger_item)) {
dout("%s %p tid %llu not registered\n", __func__, req,
req->r_tid);
return;
}
dout("%s %p tid %llu\n", __func__, req, req->r_tid);
list_del_init(&req->r_linger_item);
if (req->r_osd) {
list_del_init(&req->r_linger_osd_item);
maybe_move_osd_to_lru(osdc, req->r_osd);
if (list_empty(&req->r_osd_item))
req->r_osd = NULL;
}
ceph_osdc_put_request(req);
}
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;
}
}
EXPORT_SYMBOL(ceph_osdc_set_request_linger);
/*
* Returns whether a request should be blocked from being sent
* based on the current osdmap and osd_client settings.
*
* Caller should hold map_sem for read.
*/
static bool __req_should_be_paused(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
bool pauserd = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD);
bool pausewr = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR) ||
ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
return (req->r_flags & CEPH_OSD_FLAG_READ && pauserd) ||
(req->r_flags & CEPH_OSD_FLAG_WRITE && pausewr);
}
/*
* Calculate mapping of a request to a PG. Takes tiering into account.
*/
static int __calc_request_pg(struct ceph_osdmap *osdmap,
struct ceph_osd_request *req,
struct ceph_pg *pg_out)
{
bool need_check_tiering;
need_check_tiering = false;
if (req->r_target_oloc.pool == -1) {
req->r_target_oloc = req->r_base_oloc; /* struct */
need_check_tiering = true;
}
if (req->r_target_oid.name_len == 0) {
ceph_oid_copy(&req->r_target_oid, &req->r_base_oid);
need_check_tiering = true;
}
if (need_check_tiering &&
(req->r_flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
struct ceph_pg_pool_info *pi;
pi = ceph_pg_pool_by_id(osdmap, req->r_target_oloc.pool);
if (pi) {
if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
pi->read_tier >= 0)
req->r_target_oloc.pool = pi->read_tier;
if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
pi->write_tier >= 0)
req->r_target_oloc.pool = pi->write_tier;
}
/* !pi is caught in ceph_oloc_oid_to_pg() */
}
return ceph_oloc_oid_to_pg(osdmap, &req->r_target_oloc,
&req->r_target_oid, pg_out);
}
static void __enqueue_request(struct ceph_osd_request *req)
{
struct ceph_osd_client *osdc = req->r_osdc;
dout("%s %p tid %llu to osd%d\n", __func__, req, req->r_tid,
req->r_osd ? req->r_osd->o_osd : -1);
if (req->r_osd) {
__remove_osd_from_lru(req->r_osd);
list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
} else {
list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
}
}
/*
* 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_pg pgid;
int acting[CEPH_PG_MAX_SIZE];
int num, o;
int err;
bool was_paused;
dout("map_request %p tid %lld\n", req, req->r_tid);
err = __calc_request_pg(osdc->osdmap, req, &pgid);
if (err) {
list_move(&req->r_req_lru_item, &osdc->req_notarget);
return err;
}
req->r_pgid = pgid;
num = ceph_calc_pg_acting(osdc->osdmap, pgid, acting, &o);
if (num < 0)
num = 0;
was_paused = req->r_paused;
req->r_paused = __req_should_be_paused(osdc, req);
if (was_paused && !req->r_paused)
force_resend = 1;
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) ||
req->r_paused)
return 0; /* no change */
dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
req->r_tid, pgid.pool, pgid.seed, 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);
list_del_init(&req->r_linger_osd_item);
req->r_osd = NULL;
}
req->r_osd = __lookup_osd(osdc, o);
if (!req->r_osd && o >= 0) {
err = -ENOMEM;
req->r_osd = create_osd(osdc, o);
if (!req->r_osd) {
list_move(&req->r_req_lru_item, &osdc->req_notarget);
goto out;
}
dout("map_request osd %p is osd%d\n", req->r_osd, o);
__insert_osd(osdc, req->r_osd);
ceph_con_open(&req->r_osd->o_con,
CEPH_ENTITY_TYPE_OSD, o,
&osdc->osdmap->osd_addr[o]);
}
__enqueue_request(req);
err = 1; /* osd or pg changed */
out:
return err;
}
/*
* caller should hold map_sem (for read) and request_mutex
*/
static void __send_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
void *p;
dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
req, req->r_tid, req->r_osd->o_osd, req->r_flags,
(unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
/* fill in message content that changes each time we send it */
put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
put_unaligned_le32(req->r_flags, req->r_request_flags);
put_unaligned_le64(req->r_target_oloc.pool, req->r_request_pool);
p = req->r_request_pgid;
ceph_encode_64(&p, req->r_pgid.pool);
ceph_encode_32(&p, req->r_pgid.seed);
put_unaligned_le64(1, req->r_request_attempts); /* FIXME */
memcpy(req->r_request_reassert_version, &req->r_reassert_version,
sizeof(req->r_reassert_version));
req->r_stamp = jiffies;
list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
ceph_msg_get(req->r_request); /* send consumes a ref */
req->r_sent = req->r_osd->o_incarnation;
ceph_con_send(&req->r_osd->o_con, req->r_request);
}
/*
* Send any requests in the queue (req_unsent).
*/
static void __send_queued(struct ceph_osd_client *osdc)
{
struct ceph_osd_request *req, *tmp;
dout("__send_queued\n");
list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
__send_request(osdc, req);
}
/*
* Caller should hold map_sem for read and request_mutex.
*/
static int __ceph_osdc_start_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req,
bool nofail)
{
int rc;
__register_request(osdc, req);
req->r_sent = 0;
req->r_got_reply = 0;
rc = __map_request(osdc, req, 0);
if (rc < 0) {
if (nofail) {
dout("osdc_start_request failed map, "
" will retry %lld\n", req->r_tid);
rc = 0;
} else {
__unregister_request(osdc, req);
}
return rc;
}
if (req->r_osd == NULL) {
dout("send_request %p no up osds in pg\n", req);
ceph_monc_request_next_osdmap(&osdc->client->monc);
} else {
__send_queued(osdc);
}
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_options *opts = osdc->client->options;
struct ceph_osd_request *req;
struct ceph_osd *osd;
struct list_head slow_osds;
dout("timeout\n");
down_read(&osdc->map_sem);
ceph_monc_request_next_osdmap(&osdc->client->monc);
mutex_lock(&osdc->request_mutex);
/*
* ping osds that are a bit slow. this ensures that if there
* is a break in the TCP connection we will notice, and reopen
* a connection with that osd (from the fault callback).
*/
INIT_LIST_HEAD(&slow_osds);
list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
if (time_before(jiffies,
req->r_stamp + opts->osd_keepalive_timeout))
break;
osd = req->r_osd;
BUG_ON(!osd);
dout(" tid %llu is slow, will send keepalive on osd%d\n",
req->r_tid, osd->o_osd);
list_move_tail(&osd->o_keepalive_item, &slow_osds);
}
while (!list_empty(&slow_osds)) {
osd = list_entry(slow_osds.next, struct ceph_osd,
o_keepalive_item);
list_del_init(&osd->o_keepalive_item);
ceph_con_keepalive(&osd->o_con);
}
__schedule_osd_timeout(osdc);
__send_queued(osdc);
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
}
static void handle_osds_timeout(struct work_struct *work)
{
struct ceph_osd_client *osdc =
container_of(work, struct ceph_osd_client,
osds_timeout_work.work);
unsigned long delay = osdc->client->options->osd_idle_ttl / 4;
dout("osds timeout\n");
down_read(&osdc->map_sem);
remove_old_osds(osdc);
up_read(&osdc->map_sem);
schedule_delayed_work(&osdc->osds_timeout_work,
round_jiffies_relative(delay));
}
static int ceph_oloc_decode(void **p, void *end,
struct ceph_object_locator *oloc)
{
u8 struct_v, struct_cv;
u32 len;
void *struct_end;
int ret = 0;
ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
struct_v = ceph_decode_8(p);
struct_cv = ceph_decode_8(p);
if (struct_v < 3) {
pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
struct_v, struct_cv);
goto e_inval;
}
if (struct_cv > 6) {
pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
struct_v, struct_cv);
goto e_inval;
}
len = ceph_decode_32(p);
ceph_decode_need(p, end, len, e_inval);
struct_end = *p + len;
oloc->pool = ceph_decode_64(p);
*p += 4; /* skip preferred */
len = ceph_decode_32(p);
if (len > 0) {
pr_warn("ceph_object_locator::key is set\n");
goto e_inval;
}
if (struct_v >= 5) {
len = ceph_decode_32(p);
if (len > 0) {
pr_warn("ceph_object_locator::nspace is set\n");
goto e_inval;
}
}
if (struct_v >= 6) {
s64 hash = ceph_decode_64(p);
if (hash != -1) {
pr_warn("ceph_object_locator::hash is set\n");
goto e_inval;
}
}
/* skip the rest */
*p = struct_end;
out:
return ret;
e_inval:
ret = -EINVAL;
goto out;
}
static int ceph_redirect_decode(void **p, void *end,
struct ceph_request_redirect *redir)
{
u8 struct_v, struct_cv;
u32 len;
void *struct_end;
int ret;
ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
struct_v = ceph_decode_8(p);
struct_cv = ceph_decode_8(p);
if (struct_cv > 1) {
pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
struct_v, struct_cv);
goto e_inval;
}
len = ceph_decode_32(p);
ceph_decode_need(p, end, len, e_inval);
struct_end = *p + len;
ret = ceph_oloc_decode(p, end, &redir->oloc);
if (ret)
goto out;
len = ceph_decode_32(p);
if (len > 0) {
pr_warn("ceph_request_redirect::object_name is set\n");
goto e_inval;
}
len = ceph_decode_32(p);
*p += len; /* skip osd_instructions */
/* skip the rest */
*p = struct_end;
out:
return ret;
e_inval:
ret = -EINVAL;
goto out;
}
static void complete_request(struct ceph_osd_request *req)
{
complete_all(&req->r_safe_completion); /* fsync waiter */
}
/*
* 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)
{
void *p, *end;
struct ceph_osd_request *req;
struct ceph_request_redirect redir;
u64 tid;
int object_len;
unsigned int numops;
int payload_len, flags;
s32 result;
s32 retry_attempt;
struct ceph_pg pg;
int err;
u32 reassert_epoch;
u64 reassert_version;
u32 osdmap_epoch;
int already_completed;
u32 bytes;
unsigned int i;
tid = le64_to_cpu(msg->hdr.tid);
dout("handle_reply %p tid %llu\n", msg, tid);
p = msg->front.iov_base;
end = p + msg->front.iov_len;
ceph_decode_need(&p, end, 4, bad);
object_len = ceph_decode_32(&p);
ceph_decode_need(&p, end, object_len, bad);
p += object_len;
err = ceph_decode_pgid(&p, end, &pg);
if (err)
goto bad;
ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
flags = ceph_decode_64(&p);
result = ceph_decode_32(&p);
reassert_epoch = ceph_decode_32(&p);
reassert_version = ceph_decode_64(&p);
osdmap_epoch = ceph_decode_32(&p);
/* lookup */
down_read(&osdc->map_sem);
mutex_lock(&osdc->request_mutex);
req = __lookup_request(osdc, tid);
if (req == NULL) {
dout("handle_reply tid %llu dne\n", tid);
goto bad_mutex;
}
ceph_osdc_get_request(req);
dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
req, result);
ceph_decode_need(&p, end, 4, bad_put);
numops = ceph_decode_32(&p);
if (numops > CEPH_OSD_MAX_OP)
goto bad_put;
if (numops != req->r_num_ops)
goto bad_put;
payload_len = 0;
ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
for (i = 0; i < numops; i++) {
struct ceph_osd_op *op = p;
int len;
len = le32_to_cpu(op->payload_len);
req->r_reply_op_len[i] = len;
dout(" op %d has %d bytes\n", i, len);
payload_len += len;
p += sizeof(*op);
}
bytes = le32_to_cpu(msg->hdr.data_len);
if (payload_len != bytes) {
pr_warn("sum of op payload lens %d != data_len %d\n",
payload_len, bytes);
goto bad_put;
}
ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
retry_attempt = ceph_decode_32(&p);
for (i = 0; i < numops; i++)
req->r_reply_op_result[i] = ceph_decode_32(&p);
if (le16_to_cpu(msg->hdr.version) >= 6) {
p += 8 + 4; /* skip replay_version */
p += 8; /* skip user_version */
err = ceph_redirect_decode(&p, end, &redir);
if (err)
goto bad_put;
} else {
redir.oloc.pool = -1;
}
if (redir.oloc.pool != -1) {
dout("redirect pool %lld\n", redir.oloc.pool);
__unregister_request(osdc, req);
req->r_target_oloc = redir.oloc; /* struct */
/*
* Start redirect requests with nofail=true. If
* mapping fails, request will end up on the notarget
* list, waiting for the new osdmap (which can take
* a while), even though the original request mapped
* successfully. In the future we might want to follow
* original request's nofail setting here.
*/
err = __ceph_osdc_start_request(osdc, req, true);
BUG_ON(err);
goto out_unlock;
}
already_completed = req->r_got_reply;
if (!req->r_got_reply) {
req->r_result = result;
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.epoch = cpu_to_le32(reassert_epoch);
req->r_reassert_version.version = cpu_to_le64(reassert_version);
req->r_got_reply = 1;
} else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
dout("handle_reply tid %llu dup ack\n", tid);
goto out_unlock;
}
dout("handle_reply tid %llu flags %d\n", tid, flags);
if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
__register_linger_request(osdc, req);
/* either this is a read, or we got the safe response */
if (result < 0 ||
(flags & CEPH_OSD_FLAG_ONDISK) ||
((flags & CEPH_OSD_FLAG_WRITE) == 0))
__unregister_request(osdc, req);
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
if (!already_completed) {
if (req->r_unsafe_callback &&
result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
req->r_unsafe_callback(req, true);
if (req->r_callback)
req->r_callback(req, msg);
else
complete_all(&req->r_completion);
}
if (flags & CEPH_OSD_FLAG_ONDISK) {
if (req->r_unsafe_callback && already_completed)
req->r_unsafe_callback(req, false);
complete_request(req);
}
out:
dout("req=%p req->r_linger=%d\n", req, req->r_linger);
ceph_osdc_put_request(req);
return;
out_unlock:
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
goto out;
bad_put:
req->r_result = -EIO;
__unregister_request(osdc, req);
if (req->r_callback)
req->r_callback(req, msg);
else
complete_all(&req->r_completion);
complete_request(req);
ceph_osdc_put_request(req);
bad_mutex:
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
bad:
pr_err("corrupt osd_op_reply got %d %d\n",
(int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
ceph_msg_dump(msg);
}
static void reset_changed_osds(struct ceph_osd_client *osdc)
{
struct rb_node *p, *n;
dout("%s %p\n", __func__, osdc);
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);
}
}
/*
* Requeue requests whose mapping to an OSD has changed. If requests map to
* no osd, request a new map.
*
* Caller should hold map_sem for read.
*/
static void kick_requests(struct ceph_osd_client *osdc, bool force_resend,
bool force_resend_writes)
{
struct ceph_osd_request *req, *nreq;
struct rb_node *p;
int needmap = 0;
int err;
bool force_resend_req;
dout("kick_requests %s %s\n", force_resend ? " (force resend)" : "",
force_resend_writes ? " (force resend writes)" : "");
mutex_lock(&osdc->request_mutex);
for (p = rb_first(&osdc->requests); p; ) {
req = rb_entry(p, struct ceph_osd_request, r_node);
p = rb_next(p);
/*
* For linger requests that have not yet been
* registered, move them to the linger list; they'll
* be sent to the osd in the loop below. Unregister
* the request before re-registering it as a linger
* request to ensure the __map_request() below
* will decide it needs to be sent.
*/
if (req->r_linger && list_empty(&req->r_linger_item)) {
dout("%p tid %llu restart on osd%d\n",
req, req->r_tid,
req->r_osd ? req->r_osd->o_osd : -1);
ceph_osdc_get_request(req);
__unregister_request(osdc, req);
__register_linger_request(osdc, req);
ceph_osdc_put_request(req);
continue;
}
force_resend_req = force_resend ||
(force_resend_writes &&
req->r_flags & CEPH_OSD_FLAG_WRITE);
err = __map_request(osdc, req, force_resend_req);
if (err < 0)
continue; /* error */
if (req->r_osd == NULL) {
dout("%p tid %llu maps to no osd\n", req, req->r_tid);
needmap++; /* request a newer map */
} else if (err > 0) {
if (!req->r_linger) {
dout("%p tid %llu requeued on osd%d\n", req,
req->r_tid,
req->r_osd ? req->r_osd->o_osd : -1);
req->r_flags |= CEPH_OSD_FLAG_RETRY;
}
}
}
list_for_each_entry_safe(req, nreq, &osdc->req_linger,
r_linger_item) {
dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
err = __map_request(osdc, req,
force_resend || force_resend_writes);
dout("__map_request returned %d\n", err);
if (err < 0)
continue; /* hrm! */
if (req->r_osd == NULL || err > 0) {
if (req->r_osd == NULL) {
dout("lingering %p tid %llu maps to no osd\n",
req, req->r_tid);
/*
* A homeless lingering request makes
* no sense, as it's job is to keep
* a particular OSD connection open.
* Request a newer map and kick the
* request, knowing that it won't be
* resent until we actually get a map
* that can tell us where to send it.
*/
needmap++;
}
dout("kicking lingering %p tid %llu osd%d\n", req,
req->r_tid, req->r_osd ? req->r_osd->o_osd : -1);
__register_request(osdc, req);
__unregister_linger_request(osdc, req);
}
}
reset_changed_osds(osdc);
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;
bool was_full;
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);
was_full = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
/* 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;
}
was_full = was_full ||
ceph_osdmap_flag(osdc->osdmap,
CEPH_OSDMAP_FULL);
kick_requests(osdc, 0, was_full);
} 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 {
int skipped_map = 0;
dout("taking full map %u len %d\n", epoch, maplen);
newmap = ceph_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) {
if (oldmap->epoch + 1 < newmap->epoch)
skipped_map = 1;
ceph_osdmap_destroy(oldmap);
}
was_full = was_full ||
ceph_osdmap_flag(osdc->osdmap,
CEPH_OSDMAP_FULL);
kick_requests(osdc, skipped_map, was_full);
}
p += maplen;
nr_maps--;
}
if (!osdc->osdmap)
goto bad;
done:
downgrade_write(&osdc->map_sem);
ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
/*
* subscribe to subsequent osdmap updates if full to ensure
* we find out when we are no longer full and stop returning
* ENOSPC.
*/
if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) ||
ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD) ||
ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR))
ceph_monc_request_next_osdmap(&osdc->client->monc);
mutex_lock(&osdc->request_mutex);
__send_queued(osdc);
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
wake_up_all(&osdc->client->auth_wq);
return;
bad:
pr_err("osdc handle_map corrupt msg\n");
ceph_msg_dump(msg);
up_write(&osdc->map_sem);
}
/*
* watch/notify callback event infrastructure
*
* These callbacks are used both for watch and notify operations.
*/
static void __release_event(struct kref *kref)
{
struct ceph_osd_event *event =
container_of(kref, struct ceph_osd_event, kref);
dout("__release_event %p\n", event);
kfree(event);
}
static void get_event(struct ceph_osd_event *event)
{
kref_get(&event->kref);
}
void ceph_osdc_put_event(struct ceph_osd_event *event)
{
kref_put(&event->kref, __release_event);
}
EXPORT_SYMBOL(ceph_osdc_put_event);
static void __insert_event(struct ceph_osd_client *osdc,
struct ceph_osd_event *new)
{
struct rb_node **p = &osdc->event_tree.rb_node;
struct rb_node *parent = NULL;
struct ceph_osd_event *event = NULL;
while (*p) {
parent = *p;
event = rb_entry(parent, struct ceph_osd_event, node);
if (new->cookie < event->cookie)
p = &(*p)->rb_left;
else if (new->cookie > event->cookie)
p = &(*p)->rb_right;
else
BUG();
}
rb_link_node(&new->node, parent, p);
rb_insert_color(&new->node, &osdc->event_tree);
}
static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
u64 cookie)
{
struct rb_node **p = &osdc->event_tree.rb_node;
struct rb_node *parent = NULL;
struct ceph_osd_event *event = NULL;
while (*p) {
parent = *p;
event = rb_entry(parent, struct ceph_osd_event, node);
if (cookie < event->cookie)
p = &(*p)->rb_left;
else if (cookie > event->cookie)
p = &(*p)->rb_right;
else
return event;
}
return NULL;
}
static void __remove_event(struct ceph_osd_event *event)
{
struct ceph_osd_client *osdc = event->osdc;
if (!RB_EMPTY_NODE(&event->node)) {
dout("__remove_event removed %p\n", event);
rb_erase(&event->node, &osdc->event_tree);
ceph_osdc_put_event(event);
} else {
dout("__remove_event didn't remove %p\n", event);
}
}
int ceph_osdc_create_event(struct ceph_osd_client *osdc,
void (*event_cb)(u64, u64, u8, void *),
void *data, struct ceph_osd_event **pevent)
{
struct ceph_osd_event *event;
event = kmalloc(sizeof(*event), GFP_NOIO);
if (!event)
return -ENOMEM;
dout("create_event %p\n", event);
event->cb = event_cb;
event->one_shot = 0;
event->data = data;
event->osdc = osdc;
INIT_LIST_HEAD(&event->osd_node);
RB_CLEAR_NODE(&event->node);
kref_init(&event->kref); /* one ref for us */
kref_get(&event->kref); /* one ref for the caller */
spin_lock(&osdc->event_lock);
event->cookie = ++osdc->event_count;
__insert_event(osdc, event);
spin_unlock(&osdc->event_lock);
*pevent = event;
return 0;
}
EXPORT_SYMBOL(ceph_osdc_create_event);
void ceph_osdc_cancel_event(struct ceph_osd_event *event)
{
struct ceph_osd_client *osdc = event->osdc;
dout("cancel_event %p\n", event);
spin_lock(&osdc->event_lock);
__remove_event(event);
spin_unlock(&osdc->event_lock);
ceph_osdc_put_event(event); /* caller's */
}
EXPORT_SYMBOL(ceph_osdc_cancel_event);
static void do_event_work(struct work_struct *work)
{
struct ceph_osd_event_work *event_work =
container_of(work, struct ceph_osd_event_work, work);
struct ceph_osd_event *event = event_work->event;
u64 ver = event_work->ver;
u64 notify_id = event_work->notify_id;
u8 opcode = event_work->opcode;
dout("do_event_work completing %p\n", event);
event->cb(ver, notify_id, opcode, event->data);
dout("do_event_work completed %p\n", event);
ceph_osdc_put_event(event);
kfree(event_work);
}
/*
* Process osd watch notifications
*/
static void handle_watch_notify(struct ceph_osd_client *osdc,
struct ceph_msg *msg)
{
void *p, *end;
u8 proto_ver;
u64 cookie, ver, notify_id;
u8 opcode;
struct ceph_osd_event *event;
struct ceph_osd_event_work *event_work;
p = msg->front.iov_base;
end = p + msg->front.iov_len;
ceph_decode_8_safe(&p, end, proto_ver, bad);
ceph_decode_8_safe(&p, end, opcode, bad);
ceph_decode_64_safe(&p, end, cookie, bad);
ceph_decode_64_safe(&p, end, ver, bad);
ceph_decode_64_safe(&p, end, notify_id, bad);
spin_lock(&osdc->event_lock);
event = __find_event(osdc, cookie);
if (event) {
BUG_ON(event->one_shot);
get_event(event);
}
spin_unlock(&osdc->event_lock);
dout("handle_watch_notify cookie %lld ver %lld event %p\n",
cookie, ver, event);
if (event) {
event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
if (!event_work) {
pr_err("couldn't allocate event_work\n");
ceph_osdc_put_event(event);
return;
}
INIT_WORK(&event_work->work, do_event_work);
event_work->event = event;
event_work->ver = ver;
event_work->notify_id = notify_id;
event_work->opcode = opcode;
queue_work(osdc->notify_wq, &event_work->work);
}
return;
bad:
pr_err("osdc handle_watch_notify corrupt msg\n");
}
/*
* build new request AND message
*
*/
void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
struct ceph_snap_context *snapc, u64 snap_id,
struct timespec *mtime)
{
struct ceph_msg *msg = req->r_request;
void *p;
size_t msg_size;
int flags = req->r_flags;
u64 data_len;
unsigned int i;
req->r_snapid = snap_id;
req->r_snapc = ceph_get_snap_context(snapc);
/* encode request */
msg->hdr.version = cpu_to_le16(4);
p = msg->front.iov_base;
ceph_encode_32(&p, 1); /* client_inc is always 1 */
req->r_request_osdmap_epoch = p;
p += 4;
req->r_request_flags = p;
p += 4;
if (req->r_flags & CEPH_OSD_FLAG_WRITE)
ceph_encode_timespec(p, mtime);
p += sizeof(struct ceph_timespec);
req->r_request_reassert_version = p;
p += sizeof(struct ceph_eversion); /* will get filled in */
/* oloc */
ceph_encode_8(&p, 4);
ceph_encode_8(&p, 4);
ceph_encode_32(&p, 8 + 4 + 4);
req->r_request_pool = p;
p += 8;
ceph_encode_32(&p, -1); /* preferred */
ceph_encode_32(&p, 0); /* key len */
ceph_encode_8(&p, 1);
req->r_request_pgid = p;
p += 8 + 4;
ceph_encode_32(&p, -1); /* preferred */
/* oid */
ceph_encode_32(&p, req->r_base_oid.name_len);
memcpy(p, req->r_base_oid.name, req->r_base_oid.name_len);
dout("oid '%.*s' len %d\n", req->r_base_oid.name_len,
req->r_base_oid.name, req->r_base_oid.name_len);
p += req->r_base_oid.name_len;
/* ops--can imply data */
ceph_encode_16(&p, (u16)req->r_num_ops);
data_len = 0;
for (i = 0; i < req->r_num_ops; i++) {
data_len += osd_req_encode_op(req, p, i);
p += sizeof(struct ceph_osd_op);
}
/* snaps */
ceph_encode_64(&p, req->r_snapid);
ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
if (req->r_snapc) {
for (i = 0; i < snapc->num_snaps; i++) {
ceph_encode_64(&p, req->r_snapc->snaps[i]);
}
}
req->r_request_attempts = p;
p += 4;
/* data */
if (flags & CEPH_OSD_FLAG_WRITE) {
u16 data_off;
/*
* The header "data_off" is a hint to the receiver
* allowing it to align received data into its
* buffers such that there's no need to re-copy
* it before writing it to disk (direct I/O).
*/
data_off = (u16) (off & 0xffff);
req->r_request->hdr.data_off = cpu_to_le16(data_off);
}
req->r_request->hdr.data_len = cpu_to_le32(data_len);
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);
dout("build_request msg_size was %d\n", (int)msg_size);
}
EXPORT_SYMBOL(ceph_osdc_build_request);
/*
* Register request, send initial attempt.
*/
int ceph_osdc_start_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req,
bool nofail)
{
int rc;
down_read(&osdc->map_sem);
mutex_lock(&osdc->request_mutex);
rc = __ceph_osdc_start_request(osdc, req, nofail);
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
return rc;
}
EXPORT_SYMBOL(ceph_osdc_start_request);
/*
* Unregister a registered request. The request is not completed (i.e.
* no callbacks or wakeups) - higher layers are supposed to know what
* they are canceling.
*/
void ceph_osdc_cancel_request(struct ceph_osd_request *req)
{
struct ceph_osd_client *osdc = req->r_osdc;
mutex_lock(&osdc->request_mutex);
if (req->r_linger)
__unregister_linger_request(osdc, req);
__unregister_request(osdc, req);
mutex_unlock(&osdc->request_mutex);
dout("%s %p tid %llu canceled\n", __func__, req, req->r_tid);
}
EXPORT_SYMBOL(ceph_osdc_cancel_request);
/*
* wait for a request to complete
*/
int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
int rc;
dout("%s %p tid %llu\n", __func__, req, req->r_tid);
rc = wait_for_completion_interruptible(&req->r_completion);
if (rc < 0) {
dout("%s %p tid %llu interrupted\n", __func__, req, req->r_tid);
ceph_osdc_cancel_request(req);
complete_request(req);
return rc;
}
dout("%s %p tid %llu result %d\n", __func__, req, req->r_tid,
req->r_result);
return req->r_result;
}
EXPORT_SYMBOL(ceph_osdc_wait_request);
/*
* 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);
}
EXPORT_SYMBOL(ceph_osdc_sync);
/*
* Call all pending notify callbacks - for use after a watch is
* unregistered, to make sure no more callbacks for it will be invoked
*/
void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
{
flush_workqueue(osdc->notify_wq);
}
EXPORT_SYMBOL(ceph_osdc_flush_notifies);
/*
* init, shutdown
*/
int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
{
int err;
dout("init\n");
osdc->client = client;
osdc->osdmap = NULL;
init_rwsem(&osdc->map_sem);
init_completion(&osdc->map_waiters);
osdc->last_requested_map = 0;
mutex_init(&osdc->request_mutex);
osdc->last_tid = 0;
osdc->osds = RB_ROOT;
INIT_LIST_HEAD(&osdc->osd_lru);
osdc->requests = RB_ROOT;
INIT_LIST_HEAD(&osdc->req_lru);
INIT_LIST_HEAD(&osdc->req_unsent);
INIT_LIST_HEAD(&osdc->req_notarget);
INIT_LIST_HEAD(&osdc->req_linger);
osdc->num_requests = 0;
INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
spin_lock_init(&osdc->event_lock);
osdc->event_tree = RB_ROOT;
osdc->event_count = 0;
schedule_delayed_work(&osdc->osds_timeout_work,
round_jiffies_relative(osdc->client->options->osd_idle_ttl));
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, CEPH_MSG_OSD_OP,
OSD_OP_FRONT_LEN, 10, true,
"osd_op");
if (err < 0)
goto out_mempool;
err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
OSD_OPREPLY_FRONT_LEN, 10, true,
"osd_op_reply");
if (err < 0)
goto out_msgpool;
err = -ENOMEM;
osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
if (!osdc->notify_wq)
goto out_msgpool_reply;
return 0;
out_msgpool_reply:
ceph_msgpool_destroy(&osdc->msgpool_op_reply);
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)
{
flush_workqueue(osdc->notify_wq);
destroy_workqueue(osdc->notify_wq);
cancel_delayed_work_sync(&osdc->timeout_work);
cancel_delayed_work_sync(&osdc->osds_timeout_work);
if (osdc->osdmap) {
ceph_osdmap_destroy(osdc->osdmap);
osdc->osdmap = NULL;
}
remove_all_osds(osdc);
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, int page_align)
{
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, 0, 1,
CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
NULL, truncate_seq, truncate_size,
false);
if (IS_ERR(req))
return PTR_ERR(req);
/* it may be a short read due to an object boundary */
osd_req_op_extent_osd_data_pages(req, 0,
pages, *plen, page_align, false, false);
dout("readpages final extent is %llu~%llu (%llu bytes align %d)\n",
off, *plen, *plen, page_align);
ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
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;
}
EXPORT_SYMBOL(ceph_osdc_readpages);
/*
* 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)
{
struct ceph_osd_request *req;
int rc = 0;
int page_align = off & ~PAGE_MASK;
BUG_ON(vino.snap != CEPH_NOSNAP); /* snapshots aren't writeable */
req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
CEPH_OSD_OP_WRITE,
CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
snapc, truncate_seq, truncate_size,
true);
if (IS_ERR(req))
return PTR_ERR(req);
/* it may be a short write due to an object boundary */
osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
false, false);
dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
rc = ceph_osdc_start_request(osdc, req, true);
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;
}
EXPORT_SYMBOL(ceph_osdc_writepages);
int ceph_osdc_setup(void)
{
BUG_ON(ceph_osd_request_cache);
ceph_osd_request_cache = kmem_cache_create("ceph_osd_request",
sizeof (struct ceph_osd_request),
__alignof__(struct ceph_osd_request),
0, NULL);
return ceph_osd_request_cache ? 0 : -ENOMEM;
}
EXPORT_SYMBOL(ceph_osdc_setup);
void ceph_osdc_cleanup(void)
{
BUG_ON(!ceph_osd_request_cache);
kmem_cache_destroy(ceph_osd_request_cache);
ceph_osd_request_cache = NULL;
}
EXPORT_SYMBOL(ceph_osdc_cleanup);
/*
* 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)
goto out;
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);
break;
case CEPH_MSG_WATCH_NOTIFY:
handle_watch_notify(osdc, msg);
break;
default:
pr_err("received unknown message type %d %s\n", type,
ceph_msg_type_name(type));
}
out:
ceph_msg_put(msg);
}
/*
* Lookup and return message for incoming reply. Don't try to do
* anything about a larger than preallocated data portion of the
* message at the moment - for now, just skip the message.
*/
static struct ceph_msg *get_reply(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;
struct ceph_msg *m;
struct ceph_osd_request *req;
int front_len = le32_to_cpu(hdr->front_len);
int data_len = le32_to_cpu(hdr->data_len);
u64 tid;
tid = le64_to_cpu(hdr->tid);
mutex_lock(&osdc->request_mutex);
req = __lookup_request(osdc, tid);
if (!req) {
pr_warn("%s osd%d tid %llu unknown, skipping\n",
__func__, osd->o_osd, tid);
m = NULL;
*skip = 1;
goto out;
}
ceph_msg_revoke_incoming(req->r_reply);
if (front_len > req->r_reply->front_alloc_len) {
pr_warn("%s osd%d tid %llu front %d > preallocated %d\n",
__func__, osd->o_osd, req->r_tid, front_len,
req->r_reply->front_alloc_len);
m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
false);
if (!m)
goto out;
ceph_msg_put(req->r_reply);
req->r_reply = m;
}
if (data_len > req->r_reply->data_length) {
pr_warn("%s osd%d tid %llu data %d > preallocated %zu, skipping\n",
__func__, osd->o_osd, req->r_tid, data_len,
req->r_reply->data_length);
m = NULL;
*skip = 1;
goto out;
}
m = ceph_msg_get(req->r_reply);
dout("get_reply tid %lld %p\n", tid, m);
out:
mutex_unlock(&osdc->request_mutex);
return m;
}
static struct ceph_msg *alloc_msg(struct ceph_connection *con,
struct ceph_msg_header *hdr,
int *skip)
{
struct ceph_osd *osd = con->private;
int type = le16_to_cpu(hdr->type);
int front = le32_to_cpu(hdr->front_len);
*skip = 0;
switch (type) {
case CEPH_MSG_OSD_MAP:
case CEPH_MSG_WATCH_NOTIFY:
return ceph_msg_new(type, front, GFP_NOFS, false);
case CEPH_MSG_OSD_OPREPLY:
return get_reply(con, hdr, skip);
default:
pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
osd->o_osd);
*skip = 1;
return NULL;
}
}
/*
* 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
*/
/*
* Note: returned pointer is the address of a structure that's
* managed separately. Caller must *not* attempt to free it.
*/
static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
int *proto, 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;
struct ceph_auth_handshake *auth = &o->o_auth;
if (force_new && auth->authorizer) {
ceph_auth_destroy_authorizer(ac, auth->authorizer);
auth->authorizer = NULL;
}
if (!auth->authorizer) {
int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
auth);
if (ret)
return ERR_PTR(ret);
} else {
int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
auth);
if (ret)
return ERR_PTR(ret);
}
*proto = ac->protocol;
return auth;
}
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 ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
}
static int invalidate_authorizer(struct ceph_connection *con)
{
struct ceph_osd *o = con->private;
struct ceph_osd_client *osdc = o->o_osdc;
struct ceph_auth_client *ac = osdc->client->monc.auth;
ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
return ceph_monc_validate_auth(&osdc->client->monc);
}
static int osd_sign_message(struct ceph_msg *msg)
{
struct ceph_osd *o = msg->con->private;
struct ceph_auth_handshake *auth = &o->o_auth;
return ceph_auth_sign_message(auth, msg);
}
static int osd_check_message_signature(struct ceph_msg *msg)
{
struct ceph_osd *o = msg->con->private;
struct ceph_auth_handshake *auth = &o->o_auth;
return ceph_auth_check_message_signature(auth, msg);
}
static const 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,
.invalidate_authorizer = invalidate_authorizer,
.alloc_msg = alloc_msg,
.sign_message = osd_sign_message,
.check_message_signature = osd_check_message_signature,
.fault = osd_reset,
};
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