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libceph: introduce pg_to_raw_osds() and raw_to_up_osds() helpers

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pg_to_raw_osds() helper for computing a raw (crush) set, which can
contain non-existant and down osds.

raw_to_up_osds() helper for pruning non-existant and down osds from the
raw set, therefore transforming it into an up set, and determining up
primary.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Ilya Dryomov 2014-03-24 17:12:47 +02:00 committed by Sage Weil
parent 2abebdbca7
commit 2bd93d4d7e
1 changed files with 76 additions and 0 deletions
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76
net/ceph/osdmap.c
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@ -1520,6 +1520,82 @@ static int *calc_pg_raw(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
return osds;
}
/*
* Calculate raw (crush) set for given pgid.
*
* Return raw set length, or error.
*/
static int pg_to_raw_osds(struct ceph_osdmap *osdmap,
struct ceph_pg_pool_info *pool,
struct ceph_pg pgid, u32 pps, int *osds)
{
int ruleno;
int len;
/* crush */
ruleno = crush_find_rule(osdmap->crush, pool->crush_ruleset,
pool->type, pool->size);
if (ruleno < 0) {
pr_err("no crush rule: pool %lld ruleset %d type %d size %d\n",
pgid.pool, pool->crush_ruleset, pool->type,
pool->size);
return -ENOENT;
}
len = do_crush(osdmap, ruleno, pps, osds,
min_t(int, pool->size, CEPH_PG_MAX_SIZE),
osdmap->osd_weight, osdmap->max_osd);
if (len < 0) {
pr_err("error %d from crush rule %d: pool %lld ruleset %d type %d size %d\n",
len, ruleno, pgid.pool, pool->crush_ruleset,
pool->type, pool->size);
return len;
}
return len;
}
/*
* Given raw set, calculate up set and up primary.
*
* Return up set length. *primary is set to up primary osd id, or -1
* if up set is empty.
*/
static int raw_to_up_osds(struct ceph_osdmap *osdmap,
struct ceph_pg_pool_info *pool,
int *osds, int len, int *primary)
{
int up_primary = -1;
int i;
if (ceph_can_shift_osds(pool)) {
int removed = 0;
for (i = 0; i < len; i++) {
if (ceph_osd_is_down(osdmap, osds[i])) {
removed++;
continue;
}
if (removed)
osds[i - removed] = osds[i];
}
len -= removed;
if (len > 0)
up_primary = osds[0];
} else {
for (i = len - 1; i >= 0; i--) {
if (ceph_osd_is_down(osdmap, osds[i]))
osds[i] = CRUSH_ITEM_NONE;
else
up_primary = osds[i];
}
}
*primary = up_primary;
return len;
}
/*
* Return acting set for given pgid.
*/