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author | Sage Weil <sage@newdream.net> | 2011-02-05 05:45:58 +0100 |
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committer | Sage Weil <sage@newdream.net> | 2011-02-05 05:45:58 +0100 |
commit | e8e1ba96b207deba1339b09983f8b29f92cb1497 (patch) | |
tree | 281f255e549ec247699d9860117c3b684c472997 | |
parent | libceph: fix socket write error handling (diff) | |
download | linux-e8e1ba96b207deba1339b09983f8b29f92cb1497.tar.xz linux-e8e1ba96b207deba1339b09983f8b29f92cb1497.zip |
ceph: queue cap_snaps once per realm
We were forming a dirty list, and then queueing cap_snaps for each realm
_and_ its children, regardless of whether the children were already in the
dirty list. This meant we did it twice for some realms. Which in turn
meant we corrupted mdsc->snap_flush_list when the cap_snap was re-added to
the list it was already on, and could trigger an infinite loop.
We were also using recursion to do reach all the children, a no-no when
stack is limited.
Instead, (re)queue any children on the dirty list, avoiding processing
anything twice and avoiding any recursion.
Signed-off-by: Sage Weil <sage@newdream.net>
-rw-r--r-- | fs/ceph/snap.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c index 39c243acd062..f40b9139e437 100644 --- a/fs/ceph/snap.c +++ b/fs/ceph/snap.c @@ -584,10 +584,14 @@ static void queue_realm_cap_snaps(struct ceph_snap_realm *realm) if (lastinode) iput(lastinode); - dout("queue_realm_cap_snaps %p %llx children\n", realm, realm->ino); - list_for_each_entry(child, &realm->children, child_item) - queue_realm_cap_snaps(child); + list_for_each_entry(child, &realm->children, child_item) { + dout("queue_realm_cap_snaps %p %llx queue child %p %llx\n", + realm, realm->ino, child, child->ino); + list_del_init(&child->dirty_item); + list_add(&child->dirty_item, &realm->dirty_item); + } + list_del_init(&realm->dirty_item); dout("queue_realm_cap_snaps %p %llx done\n", realm, realm->ino); } @@ -683,7 +687,9 @@ more: * queue cap snaps _after_ we've built the new snap contexts, * so that i_head_snapc can be set appropriately. */ - list_for_each_entry(realm, &dirty_realms, dirty_item) { + while (!list_empty(&dirty_realms)) { + realm = list_first_entry(&dirty_realms, struct ceph_snap_realm, + dirty_item); queue_realm_cap_snaps(realm); } |