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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+: 6dd74e44dc1d: 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 2016-07-19 03:50:28 +02:00
parent 92d21ac74a
commit 930c532869
1 changed files with 113 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

156
net/ceph/osdmap.c
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@ -1260,6 +1260,115 @@ struct ceph_osdmap *ceph_osdmap_decode(void **p, void *end)
return map;
}
/*
* Encoding order is (new_up_client, new_state, new_weight). Need to
* apply in the (new_weight, new_state, new_up_client) order, 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
*/
static int decode_new_up_state_weight(void **p, void *end,
struct ceph_osdmap *map)
{
void *new_up_client;
void *new_state;
void *new_weight_end;
u32 len;
new_up_client = *p;
ceph_decode_32_safe(p, end, len, e_inval);
len *= sizeof(u32) + sizeof(struct ceph_entity_addr);
ceph_decode_need(p, end, len, e_inval);
*p += len;
new_state = *p;
ceph_decode_32_safe(p, end, len, e_inval);
len *= sizeof(u32) + sizeof(u8);
ceph_decode_need(p, end, len, e_inval);
*p += len;
/* new_weight */
ceph_decode_32_safe(p, end, len, e_inval);
while (len--) {
s32 osd;
u32 w;
ceph_decode_need(p, end, 2*sizeof(u32), e_inval);
osd = ceph_decode_32(p);
w = ceph_decode_32(p);
BUG_ON(osd >= map->max_osd);
pr_info("osd%d weight 0x%x %s\n", osd, w,
w == CEPH_OSD_IN ? "(in)" :
(w == CEPH_OSD_OUT ? "(out)" : ""));
map->osd_weight[osd] = w;
/*
* If we are marking in, set the EXISTS, and clear the
* AUTOOUT and NEW bits.
*/
if (w) {
map->osd_state[osd] |= CEPH_OSD_EXISTS;
map->osd_state[osd] &= ~(CEPH_OSD_AUTOOUT |
CEPH_OSD_NEW);
}
}
new_weight_end = *p;
/* new_state (up/down) */
*p = new_state;
len = ceph_decode_32(p);
while (len--) {
s32 osd;
u8 xorstate;
int ret;
osd = ceph_decode_32(p);
xorstate = ceph_decode_8(p);
if (xorstate == 0)
xorstate = CEPH_OSD_UP;
BUG_ON(osd >= map->max_osd);
if ((map->osd_state[osd] & CEPH_OSD_UP) &&
(xorstate & CEPH_OSD_UP))
pr_info("osd%d down\n", osd);
if ((map->osd_state[osd] & CEPH_OSD_EXISTS) &&
(xorstate & CEPH_OSD_EXISTS)) {
pr_info("osd%d does not exist\n", osd);
map->osd_weight[osd] = CEPH_OSD_IN;
ret = set_primary_affinity(map, osd,
CEPH_OSD_DEFAULT_PRIMARY_AFFINITY);
if (ret)
return ret;
memset(map->osd_addr + osd, 0, sizeof(*map->osd_addr));
map->osd_state[osd] = 0;
} else {
map->osd_state[osd] ^= xorstate;
}
}
/* new_up_client */
*p = new_up_client;
len = ceph_decode_32(p);
while (len--) {
s32 osd;
struct ceph_entity_addr addr;
osd = ceph_decode_32(p);
ceph_decode_copy(p, &addr, sizeof(addr));
ceph_decode_addr(&addr);
BUG_ON(osd >= map->max_osd);
pr_info("osd%d up\n", osd);
map->osd_state[osd] |= CEPH_OSD_EXISTS | CEPH_OSD_UP;
map->osd_addr[osd] = addr;
}
*p = new_weight_end;
return 0;
e_inval:
return -EINVAL;
}
/*
* decode and apply an incremental map update.
*/
@ -1358,49 +1467,10 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
__remove_pg_pool(&map->pg_pools, pi);
}
/* new_up */
ceph_decode_32_safe(p, end, len, e_inval);
while (len--) {
u32 osd;
struct ceph_entity_addr addr;
ceph_decode_32_safe(p, end, osd, e_inval);
ceph_decode_copy_safe(p, end, &addr, sizeof(addr), e_inval);
ceph_decode_addr(&addr);
pr_info("osd%d up\n", osd);
BUG_ON(osd >= map->max_osd);
map->osd_state[osd] |= CEPH_OSD_UP | CEPH_OSD_EXISTS;
map->osd_addr[osd] = addr;
}
/* new_state */
ceph_decode_32_safe(p, end, len, e_inval);
while (len--) {
u32 osd;
u8 xorstate;
ceph_decode_32_safe(p, end, osd, e_inval);
xorstate = **(u8 **)p;
(*p)++; /* clean flag */
if (xorstate == 0)
xorstate = CEPH_OSD_UP;
if (xorstate & CEPH_OSD_UP)
pr_info("osd%d down\n", osd);
if (osd < map->max_osd)
map->osd_state[osd] ^= xorstate;
}
/* new_weight */
ceph_decode_32_safe(p, end, len, e_inval);
while (len--) {
u32 osd, off;
ceph_decode_need(p, end, sizeof(u32)*2, e_inval);
osd = ceph_decode_32(p);
off = ceph_decode_32(p);
pr_info("osd%d weight 0x%x %s\n", osd, off,
off == CEPH_OSD_IN ? "(in)" :
(off == CEPH_OSD_OUT ? "(out)" : ""));
if (osd < map->max_osd)
map->osd_weight[osd] = off;
}
/* new_up_client, new_state, new_weight */
err = decode_new_up_state_weight(p, end, map);
if (err)
goto bad;
/* new_pg_temp */
err = decode_new_pg_temp(p, end, map);