From e8e1ba96b207deba1339b09983f8b29f92cb1497 Mon Sep 17 00:00:00 2001 From: Sage Weil Date: Fri, 4 Feb 2011 20:45:58 -0800 Subject: 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 --- fs/ceph/snap.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'fs') diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c index 39c243acd06..f40b9139e43 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); } -- cgit v1.2.3-70-g09d2 From 97d79b403ef03f729883246208ef5d8a2ebc4d68 Mon Sep 17 00:00:00 2001 From: Yehuda Sadeh Date: Tue, 18 Jan 2011 13:37:28 -0800 Subject: ceph: keep reference to parent inode on ceph_dentry When creating a new dentry we now hold a reference to the parent inode in the ceph_dentry. This is required due to the new RCU changes from 949854d0, which set dentry->d_parent to NULL in d_kill before calling the ->release() callback. If/when that behavior is changed, we can revert this hack. Signed-off-by: Yehuda Sadeh Signed-off-by: Sage Weil --- fs/ceph/dir.c | 5 ++++- fs/ceph/super.h | 1 + 2 files changed, 5 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index 562f9884a4d..6bfaa6a4ec4 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -60,6 +60,7 @@ int ceph_init_dentry(struct dentry *dentry) } di->dentry = dentry; di->lease_session = NULL; + di->parent_inode = igrab(dentry->d_parent->d_inode); dentry->d_fsdata = di; dentry->d_time = jiffies; ceph_dentry_lru_add(dentry); @@ -1025,7 +1026,7 @@ static void ceph_dentry_release(struct dentry *dentry) u64 snapid = CEPH_NOSNAP; if (!IS_ROOT(dentry)) { - parent_inode = dentry->d_parent->d_inode; + parent_inode = di->parent_inode; if (parent_inode) snapid = ceph_snap(parent_inode); } @@ -1050,6 +1051,8 @@ static void ceph_dentry_release(struct dentry *dentry) kmem_cache_free(ceph_dentry_cachep, di); dentry->d_fsdata = NULL; } + if (parent_inode) + iput(parent_inode); } static int ceph_snapdir_d_revalidate(struct dentry *dentry, diff --git a/fs/ceph/super.h b/fs/ceph/super.h index 6e082669511..c01aa646b40 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -207,6 +207,7 @@ struct ceph_dentry_info { struct dentry *dentry; u64 time; u64 offset; + struct inode *parent_inode; }; struct ceph_inode_xattrs_info { -- cgit v1.2.3-70-g09d2