From 6c99f2545dbb9e53afe0d1d037c51ab04ef1ff4e Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Mon, 10 May 2010 16:12:25 -0700
Subject: [PATCH] ceph: throw out dirty caps metadata, data on session teardown
The remove_session_caps() helper is called when an MDS closes out our
session (either normally, or as a result of a failed reconnect), and when
we tear down state for umount. If we remove the last cap, and there are
no cap migrations in progress, then there is little hope of us flushing
out that data to the mds (without heroic efforts to reconnect and flush).
So, to avoid leaving inodes pinned (due to dirty state) and crashing after
umount, throw out dirty caps state and unpin the inodes. Print a warning
to the console so we know something was lost.
NOTE: Although we drop wrbuffer refs, we don't actually mark pages clean;
maybe a truncate should be queued?
Signed-off-by: Sage Weil <sage@newdream.net>
---
fs/ceph/mds_client.c | 44 +++++++++++++++++++++++++++++++++++++++++---
1 file changed, 41 insertions(+), 3 deletions(-)
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 525085f36db9..114bada97c16 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -799,12 +799,49 @@ static int iterate_session_caps(struct ceph_mds_session *session,
}
static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
- void *arg)
+ void *arg)
{
struct ceph_inode_info *ci = ceph_inode(inode);
+ int drop = 0;
+
dout("removing cap %p, ci is %p, inode is %p\n",
cap, ci, &ci->vfs_inode);
- ceph_remove_cap(cap);
+ spin_lock(&inode->i_lock);
+ __ceph_remove_cap(cap);
+ if (!__ceph_is_any_real_caps(ci)) {
+ struct ceph_mds_client *mdsc =
+ &ceph_sb_to_client(inode->i_sb)->mdsc;
+
+ spin_lock(&mdsc->cap_dirty_lock);
+ if (!list_empty(&ci->i_dirty_item)) {
+ pr_info(" dropping dirty %s state for %p %lld\n",
+ ceph_cap_string(ci->i_dirty_caps),
+ inode, ceph_ino(inode));
+ ci->i_dirty_caps = 0;
+ list_del_init(&ci->i_dirty_item);
+ drop = 1;
+ }
+ if (!list_empty(&ci->i_flushing_item)) {
+ pr_info(" dropping dirty+flushing %s state for %p %lld\n",
+ ceph_cap_string(ci->i_flushing_caps),
+ inode, ceph_ino(inode));
+ ci->i_flushing_caps = 0;
+ list_del_init(&ci->i_flushing_item);
+ mdsc->num_cap_flushing--;
+ drop = 1;
+ }
+ if (drop && ci->i_wrbuffer_ref) {
+ pr_info(" dropping dirty data for %p %lld\n",
+ inode, ceph_ino(inode));
+ ci->i_wrbuffer_ref = 0;
+ ci->i_wrbuffer_ref_head = 0;
+ drop++;
+ }
+ spin_unlock(&mdsc->cap_dirty_lock);
+ }
+ spin_unlock(&inode->i_lock);
+ while (drop--)
+ iput(inode);
return 0;
}
@@ -816,6 +853,7 @@ static void remove_session_caps(struct ceph_mds_session *session)
dout("remove_session_caps on %p\n", session);
iterate_session_caps(session, remove_session_caps_cb, NULL);
BUG_ON(session->s_nr_caps > 0);
+ BUG_ON(!list_empty(&session->s_cap_flushing));
cleanup_cap_releases(session);
}
@@ -1281,7 +1319,7 @@ char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
len += 1 + temp->d_name.len;
temp = temp->d_parent;
if (temp == NULL) {
- pr_err("build_path_dentry corrupt dentry %p\n", dentry);
+ pr_err("build_path corrupt dentry %p\n", dentry);
return ERR_PTR(-EINVAL);
}
}
--
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