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libceph: force resend of osd requests if we skip an osdmap

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If we skip over one or more map epochs, we need to resend all osd requests
because it is possible they remapped to other servers and then back.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2011-10-14 13:33:55 -07:00
parent ee3b56f265
commit 38d6453ca3
1 changed files with 16 additions and 10 deletions
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26
net/ceph/osd_client.c
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@ -943,7 +943,7 @@ EXPORT_SYMBOL(ceph_osdc_set_request_linger);
* Caller should hold map_sem for read and request_mutex.
*/
static int __map_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
struct ceph_osd_request *req, int force_resend)
{
struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
struct ceph_pg pgid;
@ -967,7 +967,8 @@ static int __map_request(struct ceph_osd_client *osdc,
num = err;
}
if ((req->r_osd && req->r_osd->o_osd == o &&
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) ||
@ -1289,18 +1290,18 @@ static void reset_changed_osds(struct ceph_osd_client *osdc)
*
* Caller should hold map_sem for read and request_mutex.
*/
static void kick_requests(struct ceph_osd_client *osdc)
static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
{
struct ceph_osd_request *req, *nreq;
struct rb_node *p;
int needmap = 0;
int err;
dout("kick_requests\n");
dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
mutex_lock(&osdc->request_mutex);
for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
req = rb_entry(p, struct ceph_osd_request, r_node);
err = __map_request(osdc, req);
err = __map_request(osdc, req, force_resend);
if (err < 0)
continue; /* error */
if (req->r_osd == NULL) {
@ -1318,7 +1319,7 @@ static void kick_requests(struct ceph_osd_client *osdc)
r_linger_item) {
dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
err = __map_request(osdc, req);
err = __map_request(osdc, req, force_resend);
if (err == 0)
continue; /* no change and no osd was specified */
if (err < 0)
@ -1395,7 +1396,7 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
ceph_osdmap_destroy(osdc->osdmap);
osdc->osdmap = newmap;
}
kick_requests(osdc);
kick_requests(osdc, 0);
reset_changed_osds(osdc);
} else {
dout("ignoring incremental map %u len %d\n",
@ -1423,6 +1424,8 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
"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 = osdmap_decode(&p, p+maplen);
if (IS_ERR(newmap)) {
@ -1432,9 +1435,12 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
BUG_ON(!newmap);
oldmap = osdc->osdmap;
osdc->osdmap = newmap;
if (oldmap)
if (oldmap) {
if (oldmap->epoch + 1 < newmap->epoch)
skipped_map = 1;
ceph_osdmap_destroy(oldmap);
kick_requests(osdc);
}
kick_requests(osdc, skipped_map);
}
p += maplen;
nr_maps--;
@ -1707,7 +1713,7 @@ int ceph_osdc_start_request(struct ceph_osd_client *osdc,
* the request still han't been touched yet.
*/
if (req->r_sent == 0) {
rc = __map_request(osdc, req);
rc = __map_request(osdc, req, 0);
if (rc < 0) {
if (nofail) {
dout("osdc_start_request failed map, "