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libceph: apply new_state before new_up_client on incrementals
Currently, osd_weight and osd_state fields are updated in the encoding
order. This is wrong, because an incremental map may look like e.g.
new_up_client: { osd=6, addr=... } # set osd_state and addr
new_state: { osd=6, xorstate=EXISTS } # clear osd_state
Suppose osd6's current osd_state is EXISTS (i.e. osd6 is down). After
applying new_up_client, osd_state is changed to EXISTS | UP. Carrying
on with the new_state update, we flip EXISTS and leave osd6 in a weird
"!EXISTS but UP" state. A non-existent OSD is considered down by the
mapping code
2087 for (i = 0; i < pg->pg_temp.len; i++) {
2088 if (ceph_osd_is_down(osdmap, pg->pg_temp.osds[i])) {
2089 if (ceph_can_shift_osds(pi))
2090 continue;
2091
2092 temp->osds[temp->size++] = CRUSH_ITEM_NONE;
and so requests get directed to the second OSD in the set instead of
the first, resulting in OSD-side errors like:
[WRN] : client.4239 192.168.122.21:0/2444980242 misdirected client.4239.1:2827 pg 2.5df899f2 to osd.4 not [1,4,6] in e680/680
and hung rbds on the client:
[ 493.566367] rbd: rbd0: write 400000 at 11cc00000 (0)
[ 493.566805] rbd: rbd0: result -6 xferred 400000
[ 493.567011] blk_update_request: I/O error, dev rbd0, sector 9330688
The fix is to decouple application from the decoding and:
- apply new_weight first
- apply new_state before new_up_client
- twiddle osd_state flags if marking in
- clear out some of the state if osd is destroyed
Fixes: http://tracker.ceph.com/issues/14901
Cc: stable@vger.kernel.org # 3.15+: 6dd74e44dc: libceph: set 'exists' flag for newly up osd
Cc: stable@vger.kernel.org # 3.15+
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Josh Durgin <jdurgin@redhat.com>
This commit is contained in:
Ilya Dryomov
parent
92d21ac74a
commit
930c532869
@ -1260,6 +1260,115 @@ struct ceph_osdmap *ceph_osdmap_decode(void **p, void *end)
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return map;
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}
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/*
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* Encoding order is (new_up_client, new_state, new_weight). Need to
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* apply in the (new_weight, new_state, new_up_client) order, because
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* an incremental map may look like e.g.
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*
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* new_up_client: { osd=6, addr=... } # set osd_state and addr
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* new_state: { osd=6, xorstate=EXISTS } # clear osd_state
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*/
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static int decode_new_up_state_weight(void **p, void *end,
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struct ceph_osdmap *map)
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{
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void *new_up_client;
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void *new_state;
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void *new_weight_end;
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u32 len;
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new_up_client = *p;
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ceph_decode_32_safe(p, end, len, e_inval);
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len *= sizeof(u32) + sizeof(struct ceph_entity_addr);
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ceph_decode_need(p, end, len, e_inval);
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*p += len;
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new_state = *p;
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ceph_decode_32_safe(p, end, len, e_inval);
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len *= sizeof(u32) + sizeof(u8);
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ceph_decode_need(p, end, len, e_inval);
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*p += len;
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/* new_weight */
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ceph_decode_32_safe(p, end, len, e_inval);
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while (len--) {
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s32 osd;
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u32 w;
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ceph_decode_need(p, end, 2*sizeof(u32), e_inval);
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osd = ceph_decode_32(p);
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w = ceph_decode_32(p);
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BUG_ON(osd >= map->max_osd);
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pr_info("osd%d weight 0x%x %s\n", osd, w,
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w == CEPH_OSD_IN ? "(in)" :
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(w == CEPH_OSD_OUT ? "(out)" : ""));
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map->osd_weight[osd] = w;
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/*
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* If we are marking in, set the EXISTS, and clear the
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* AUTOOUT and NEW bits.
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*/
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if (w) {
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map->osd_state[osd] |= CEPH_OSD_EXISTS;
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map->osd_state[osd] &= ~(CEPH_OSD_AUTOOUT |
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CEPH_OSD_NEW);
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}
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}
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new_weight_end = *p;
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/* new_state (up/down) */
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*p = new_state;
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len = ceph_decode_32(p);
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while (len--) {
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s32 osd;
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u8 xorstate;
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int ret;
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osd = ceph_decode_32(p);
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xorstate = ceph_decode_8(p);
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if (xorstate == 0)
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xorstate = CEPH_OSD_UP;
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BUG_ON(osd >= map->max_osd);
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if ((map->osd_state[osd] & CEPH_OSD_UP) &&
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(xorstate & CEPH_OSD_UP))
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pr_info("osd%d down\n", osd);
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if ((map->osd_state[osd] & CEPH_OSD_EXISTS) &&
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(xorstate & CEPH_OSD_EXISTS)) {
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pr_info("osd%d does not exist\n", osd);
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map->osd_weight[osd] = CEPH_OSD_IN;
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ret = set_primary_affinity(map, osd,
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CEPH_OSD_DEFAULT_PRIMARY_AFFINITY);
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if (ret)
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return ret;
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memset(map->osd_addr + osd, 0, sizeof(*map->osd_addr));
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map->osd_state[osd] = 0;
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} else {
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map->osd_state[osd] ^= xorstate;
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}
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}
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/* new_up_client */
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*p = new_up_client;
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len = ceph_decode_32(p);
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while (len--) {
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s32 osd;
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struct ceph_entity_addr addr;
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osd = ceph_decode_32(p);
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ceph_decode_copy(p, &addr, sizeof(addr));
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ceph_decode_addr(&addr);
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BUG_ON(osd >= map->max_osd);
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pr_info("osd%d up\n", osd);
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map->osd_state[osd] |= CEPH_OSD_EXISTS | CEPH_OSD_UP;
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map->osd_addr[osd] = addr;
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}
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*p = new_weight_end;
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return 0;
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e_inval:
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return -EINVAL;
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}
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/*
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* decode and apply an incremental map update.
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*/
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@ -1358,49 +1467,10 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
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__remove_pg_pool(&map->pg_pools, pi);
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}
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/* new_up */
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ceph_decode_32_safe(p, end, len, e_inval);
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while (len--) {
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u32 osd;
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struct ceph_entity_addr addr;
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ceph_decode_32_safe(p, end, osd, e_inval);
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ceph_decode_copy_safe(p, end, &addr, sizeof(addr), e_inval);
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ceph_decode_addr(&addr);
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pr_info("osd%d up\n", osd);
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BUG_ON(osd >= map->max_osd);
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map->osd_state[osd] |= CEPH_OSD_UP | CEPH_OSD_EXISTS;
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map->osd_addr[osd] = addr;
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}
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/* new_state */
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ceph_decode_32_safe(p, end, len, e_inval);
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while (len--) {
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u32 osd;
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u8 xorstate;
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ceph_decode_32_safe(p, end, osd, e_inval);
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xorstate = **(u8 **)p;
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(*p)++; /* clean flag */
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if (xorstate == 0)
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xorstate = CEPH_OSD_UP;
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if (xorstate & CEPH_OSD_UP)
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pr_info("osd%d down\n", osd);
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if (osd < map->max_osd)
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map->osd_state[osd] ^= xorstate;
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}
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/* new_weight */
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ceph_decode_32_safe(p, end, len, e_inval);
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while (len--) {
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u32 osd, off;
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ceph_decode_need(p, end, sizeof(u32)*2, e_inval);
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osd = ceph_decode_32(p);
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off = ceph_decode_32(p);
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pr_info("osd%d weight 0x%x %s\n", osd, off,
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off == CEPH_OSD_IN ? "(in)" :
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(off == CEPH_OSD_OUT ? "(out)" : ""));
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if (osd < map->max_osd)
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map->osd_weight[osd] = off;
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}
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/* new_up_client, new_state, new_weight */
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err = decode_new_up_state_weight(p, end, map);
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if (err)
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goto bad;
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/* new_pg_temp */
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err = decode_new_pg_temp(p, end, map);
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