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libceph: allocate the locator string with GFP_NOFAIL

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calc_target() isn't supposed to fail with anything but POOL_DNE, in
which case we report that the pool doesn't exist and fail the request
with -ENOENT.  Doing this for -ENOMEM is at the very least confusing
and also harmful -- as the preceding requests complete, a short-lived
locator string allocation is likely to succeed after a wait.

(We used to call ceph_object_locator_to_pg() for a pi lookup.  In
theory that could fail with -ENOENT, hence the "ret != -ENOENT" warning
being removed.)

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov
2018-05-23 14:46:53 +02:00
parent c843d13cae
commit a86f009f10
3 changed files with 13 additions and 24 deletions
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19
net/ceph/osdmap.c
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@@ -2145,10 +2145,10 @@ bool ceph_osds_changed(const struct ceph_osds *old_acting,
* Should only be called with target_oid and target_oloc (as opposed to
* base_oid and base_oloc), since tiering isn't taken into account.
*/
int __ceph_object_locator_to_pg(struct ceph_pg_pool_info *pi,
const struct ceph_object_id *oid,
const struct ceph_object_locator *oloc,
struct ceph_pg *raw_pgid)
void __ceph_object_locator_to_pg(struct ceph_pg_pool_info *pi,
const struct ceph_object_id *oid,
const struct ceph_object_locator *oloc,
struct ceph_pg *raw_pgid)
{
WARN_ON(pi->id != oloc->pool);
@@ -2164,11 +2164,8 @@ int __ceph_object_locator_to_pg(struct ceph_pg_pool_info *pi,
int nsl = oloc->pool_ns->len;
size_t total = nsl + 1 + oid->name_len;
if (total > sizeof(stack_buf)) {
buf = kmalloc(total, GFP_NOIO);
if (!buf)
return -ENOMEM;
}
if (total > sizeof(stack_buf))
buf = kmalloc(total, GFP_NOIO | __GFP_NOFAIL);
memcpy(buf, oloc->pool_ns->str, nsl);
buf[nsl] = '\037';
memcpy(buf + nsl + 1, oid->name, oid->name_len);
@@ -2180,7 +2177,6 @@ int __ceph_object_locator_to_pg(struct ceph_pg_pool_info *pi,
oid->name, nsl, oloc->pool_ns->str,
raw_pgid->pool, raw_pgid->seed);
}
return 0;
}
int ceph_object_locator_to_pg(struct ceph_osdmap *osdmap,
@@ -2194,7 +2190,8 @@ int ceph_object_locator_to_pg(struct ceph_osdmap *osdmap,
if (!pi)
return -ENOENT;
return __ceph_object_locator_to_pg(pi, oid, oloc, raw_pgid);
__ceph_object_locator_to_pg(pi, oid, oloc, raw_pgid);
return 0;
}
EXPORT_SYMBOL(ceph_object_locator_to_pg);