[PATCH v2 0/3] ceph: remove the capsnaps when removing the caps

[PATCH v2 0/3] ceph: remove the capsnaps when removing the caps

[xiubli]

From: Xiubo Li <xiubli@redhat.com>

V2:
- minor fixes to clean up the code from Jeff's comments, thanks
- swith to use lockdep_assert_held().

Xiubo Li (3):
  ceph: remove the capsnaps when removing the caps
  ceph: don't WARN if we're force umounting
  ceph: don't WARN if we're iterate removing the session caps

 fs/ceph/caps.c       | 95 ++++++++++++++++++++++++++++++++------------
 fs/ceph/mds_client.c | 34 ++++++++++++++--
 fs/ceph/super.h      |  7 ++++
 3 files changed, 107 insertions(+), 29 deletions(-)

-- 
2.27.0

[PATCH v2 1/3] ceph: remove the capsnaps when removing the caps

[xiubli]

From: Xiubo Li <xiubli@redhat.com>

The capsnaps will ihold the inodes when queuing to flush, so when
force umounting it will close the sessions first and if the MDSes
respond very fast and the session connections are closed just
before killing the superblock, which will flush the msgr queue,
then the flush capsnap callback won't ever be called, which will
lead the memory leak bug for the ceph_inode_info.

URL: https://tracker.ceph.com/issues/52295
Signed-off-by: Xiubo Li <xiubli@redhat.com>
---
 fs/ceph/caps.c       | 56 +++++++++++++++++++++++++++++++-------------
 fs/ceph/mds_client.c | 25 +++++++++++++++++++-
 fs/ceph/super.h      |  6 +++++
 3 files changed, 70 insertions(+), 17 deletions(-)

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index ddd86106e6d0..557c610289fb 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3658,6 +3658,43 @@ static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
 		iput(inode);
 }
 
+void __ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap,
+			   bool *wake_ci, bool *wake_mdsc)
+{
+	struct ceph_inode_info *ci = ceph_inode(inode);
+	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
+	bool ret;
+
+	lockdep_assert_held(&ci->i_ceph_lock);
+
+	dout("removing capsnap %p, inode %p ci %p\n", capsnap, inode, ci);
+
+	list_del_init(&capsnap->ci_item);
+	ret = __detach_cap_flush_from_ci(ci, &capsnap->cap_flush);
+	if (wake_ci)
+		*wake_ci = ret;
+
+	spin_lock(&mdsc->cap_dirty_lock);
+	if (list_empty(&ci->i_cap_flush_list))
+		list_del_init(&ci->i_flushing_item);
+
+	ret = __detach_cap_flush_from_mdsc(mdsc, &capsnap->cap_flush);
+	if (wake_mdsc)
+		*wake_mdsc = ret;
+	spin_unlock(&mdsc->cap_dirty_lock);
+}
+
+void ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap,
+			 bool *wake_ci, bool *wake_mdsc)
+{
+	struct ceph_inode_info *ci = ceph_inode(inode);
+
+	lockdep_assert_held(&ci->i_ceph_lock);
+
+	WARN_ON_ONCE(capsnap->dirty_pages || capsnap->writing);
+	__ceph_remove_capsnap(inode, capsnap, wake_ci, wake_mdsc);
+}
+
 /*
  * Handle FLUSHSNAP_ACK.  MDS has flushed snap data to disk and we can
  * throw away our cap_snap.
@@ -3695,23 +3732,10 @@ static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
 			     capsnap, capsnap->follows);
 		}
 	}
-	if (flushed) {
-		WARN_ON(capsnap->dirty_pages || capsnap->writing);
-		dout(" removing %p cap_snap %p follows %lld\n",
-		     inode, capsnap, follows);
-		list_del(&capsnap->ci_item);
-		wake_ci |= __detach_cap_flush_from_ci(ci, &capsnap->cap_flush);
-
-		spin_lock(&mdsc->cap_dirty_lock);
-
-		if (list_empty(&ci->i_cap_flush_list))
-			list_del_init(&ci->i_flushing_item);
-
-		wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc,
-							  &capsnap->cap_flush);
-		spin_unlock(&mdsc->cap_dirty_lock);
-	}
+	if (flushed)
+		ceph_remove_capsnap(inode, capsnap, &wake_ci, &wake_mdsc);
 	spin_unlock(&ci->i_ceph_lock);
+
 	if (flushed) {
 		ceph_put_snap_context(capsnap->context);
 		ceph_put_cap_snap(capsnap);
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index df3a735f7837..df10f9b33660 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1604,10 +1604,32 @@ int ceph_iterate_session_caps(struct ceph_mds_session *session,
 	return ret;
 }
 
+static void remove_capsnaps(struct ceph_mds_client *mdsc, struct inode *inode)
+{
+	struct ceph_inode_info *ci = ceph_inode(inode);
+	struct ceph_cap_snap *capsnap;
+
+	lockdep_assert_held(&ci->i_ceph_lock);
+
+	dout("removing capsnaps, ci is %p, inode is %p\n", ci, inode);
+
+	while (!list_empty(&ci->i_cap_snaps)) {
+		capsnap = list_first_entry(&ci->i_cap_snaps,
+					   struct ceph_cap_snap, ci_item);
+		__ceph_remove_capsnap(inode, capsnap, NULL, NULL);
+		ceph_put_snap_context(capsnap->context);
+		ceph_put_cap_snap(capsnap);
+		iput(inode);
+	}
+	wake_up_all(&ci->i_cap_wq);
+	wake_up_all(&mdsc->cap_flushing_wq);
+}
+
 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
 				  void *arg)
 {
 	struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
+	struct ceph_mds_client *mdsc = fsc->mdsc;
 	struct ceph_inode_info *ci = ceph_inode(inode);
 	LIST_HEAD(to_remove);
 	bool dirty_dropped = false;
@@ -1619,7 +1641,6 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
 	__ceph_remove_cap(cap, false);
 	if (!ci->i_auth_cap) {
 		struct ceph_cap_flush *cf;
-		struct ceph_mds_client *mdsc = fsc->mdsc;
 
 		if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
 			if (inode->i_data.nrpages > 0)
@@ -1684,6 +1705,8 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
 			ci->i_prealloc_cap_flush = NULL;
 		}
 	}
+	if (!list_empty(&ci->i_cap_snaps))
+		remove_capsnaps(mdsc, inode);
 	spin_unlock(&ci->i_ceph_lock);
 	while (!list_empty(&to_remove)) {
 		struct ceph_cap_flush *cf;
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 8f4f2747be65..445d13d760d1 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -1169,6 +1169,12 @@ extern void ceph_put_cap_refs_no_check_caps(struct ceph_inode_info *ci,
 					    int had);
 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
 				       struct ceph_snap_context *snapc);
+extern void __ceph_remove_capsnap(struct inode *inode,
+				  struct ceph_cap_snap *capsnap,
+				  bool *wake_ci, bool *wake_mdsc);
+extern void ceph_remove_capsnap(struct inode *inode,
+				struct ceph_cap_snap *capsnap,
+				bool *wake_ci, bool *wake_mdsc);
 extern void ceph_flush_snaps(struct ceph_inode_info *ci,
 			     struct ceph_mds_session **psession);
 extern bool __ceph_should_report_size(struct ceph_inode_info *ci);
-- 
2.27.0

[PATCH v2 2/3] ceph: don't WARN if we're force umounting

[xiubli]

From: Xiubo Li <xiubli@redhat.com>

Force umount will try to close the sessions by setting the session
state to _CLOSING, so in ceph_kill_sb after that it will warn on it.

URL: https://tracker.ceph.com/issues/52295
Signed-off-by: Xiubo Li <xiubli@redhat.com>
---
 fs/ceph/mds_client.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index df10f9b33660..5831c7e137ee 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -4560,6 +4560,8 @@ static void maybe_recover_session(struct ceph_mds_client *mdsc)
 
 bool check_session_state(struct ceph_mds_session *s)
 {
+	struct ceph_fs_client *fsc = s->s_mdsc->fsc;
+
 	switch (s->s_state) {
 	case CEPH_MDS_SESSION_OPEN:
 		if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
@@ -4568,8 +4570,9 @@ bool check_session_state(struct ceph_mds_session *s)
 		}
 		break;
 	case CEPH_MDS_SESSION_CLOSING:
-		/* Should never reach this when we're unmounting */
-		WARN_ON_ONCE(s->s_ttl);
+		/* Should never reach this when none force unmounting */
+		WARN_ON_ONCE(s->s_ttl &&
+			     READ_ONCE(fsc->mount_state) != CEPH_MOUNT_SHUTDOWN);
 		fallthrough;
 	case CEPH_MDS_SESSION_NEW:
 	case CEPH_MDS_SESSION_RESTARTING:
-- 
2.27.0

[PATCH v2 3/3] ceph: don't WARN if we're iterate removing the session caps

[xiubli]

From: Xiubo Li <xiubli@redhat.com>

For example in case force umounting it will remove all the session
caps one by one even it's dirty cap.

URL: https://tracker.ceph.com/issues/52295
Signed-off-by: Xiubo Li <xiubli@redhat.com>
---
 fs/ceph/caps.c       | 39 ++++++++++++++++++++++++++++++---------
 fs/ceph/mds_client.c |  2 +-
 fs/ceph/super.h      |  1 +
 3 files changed, 32 insertions(+), 10 deletions(-)

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 557c610289fb..4f0dbc640b0b 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -1114,17 +1114,16 @@ void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
 		return;
 	}
 
+	lockdep_assert_held(&ci->i_ceph_lock);
+
 	dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
 
 	mdsc = ceph_inode_to_client(&ci->vfs_inode)->mdsc;
 
 	/* remove from inode's cap rbtree, and clear auth cap */
 	rb_erase(&cap->ci_node, &ci->i_caps);
-	if (ci->i_auth_cap == cap) {
-		WARN_ON_ONCE(!list_empty(&ci->i_dirty_item) &&
-			     !mdsc->fsc->blocklisted);
+	if (ci->i_auth_cap == cap)
 		ci->i_auth_cap = NULL;
-	}
 
 	/* remove from session list */
 	spin_lock(&session->s_cap_lock);
@@ -1176,6 +1175,28 @@ void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
 	}
 }
 
+void ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
+{
+	struct ceph_inode_info *ci = cap->ci;
+	struct ceph_fs_client *fsc;
+
+	/* 'ci' being NULL means the remove have already occurred */
+	if (!ci) {
+		dout("%s: cap inode is NULL\n", __func__);
+		return;
+	}
+
+	lockdep_assert_held(&ci->i_ceph_lock);
+
+	fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
+	WARN_ON_ONCE(ci->i_auth_cap == cap &&
+		     !list_empty(&ci->i_dirty_item) &&
+		     !fsc->blocklisted &&
+		     READ_ONCE(fsc->mount_state) != CEPH_MOUNT_SHUTDOWN);
+
+	__ceph_remove_cap(cap, queue_release);
+}
+
 struct cap_msg_args {
 	struct ceph_mds_session	*session;
 	u64			ino, cid, follows;
@@ -1304,7 +1325,7 @@ void __ceph_remove_caps(struct ceph_inode_info *ci)
 	while (p) {
 		struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
 		p = rb_next(p);
-		__ceph_remove_cap(cap, true);
+		ceph_remove_cap(cap, true);
 	}
 	spin_unlock(&ci->i_ceph_lock);
 }
@@ -3819,7 +3840,7 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
 		goto out_unlock;
 
 	if (target < 0) {
-		__ceph_remove_cap(cap, false);
+		ceph_remove_cap(cap, false);
 		goto out_unlock;
 	}
 
@@ -3854,7 +3875,7 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
 				change_auth_cap_ses(ci, tcap->session);
 			}
 		}
-		__ceph_remove_cap(cap, false);
+		ceph_remove_cap(cap, false);
 		goto out_unlock;
 	} else if (tsession) {
 		/* add placeholder for the export tagert */
@@ -3871,7 +3892,7 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
 			spin_unlock(&mdsc->cap_dirty_lock);
 		}
 
-		__ceph_remove_cap(cap, false);
+		ceph_remove_cap(cap, false);
 		goto out_unlock;
 	}
 
@@ -3982,7 +4003,7 @@ static void handle_cap_import(struct ceph_mds_client *mdsc,
 					ocap->mseq, mds, le32_to_cpu(ph->seq),
 					le32_to_cpu(ph->mseq));
 		}
-		__ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
+		ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
 	}
 
 	*old_issued = issued;
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 5831c7e137ee..a183a35e2805 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2010,7 +2010,7 @@ static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
 
 	if (oissued) {
 		/* we aren't the only cap.. just remove us */
-		__ceph_remove_cap(cap, true);
+		ceph_remove_cap(cap, true);
 		(*remaining)--;
 	} else {
 		struct dentry *dentry;
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 445d13d760d1..c1add4ed59d2 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -1144,6 +1144,7 @@ extern void ceph_add_cap(struct inode *inode,
 			 unsigned cap, unsigned seq, u64 realmino, int flags,
 			 struct ceph_cap **new_cap);
 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
+extern void ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
 extern void __ceph_remove_caps(struct ceph_inode_info *ci);
 extern void ceph_put_cap(struct ceph_mds_client *mdsc,
 			 struct ceph_cap *cap);
-- 
2.27.0

Re: [PATCH v2 1/3] ceph: remove the capsnaps when removing the caps

[Xiubo Li]

There still has one bug, I am looking at it.

Thanks


On 8/25/21 1:13 PM, xiubli@redhat.com wrote:
> From: Xiubo Li <xiubli@redhat.com>
>
> The capsnaps will ihold the inodes when queuing to flush, so when
> force umounting it will close the sessions first and if the MDSes
> respond very fast and the session connections are closed just
> before killing the superblock, which will flush the msgr queue,
> then the flush capsnap callback won't ever be called, which will
> lead the memory leak bug for the ceph_inode_info.
>
> URL: https://tracker.ceph.com/issues/52295
> Signed-off-by: Xiubo Li <xiubli@redhat.com>
> ---
>   fs/ceph/caps.c       | 56 +++++++++++++++++++++++++++++++-------------
>   fs/ceph/mds_client.c | 25 +++++++++++++++++++-
>   fs/ceph/super.h      |  6 +++++
>   3 files changed, 70 insertions(+), 17 deletions(-)
>
> diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
> index ddd86106e6d0..557c610289fb 100644
> --- a/fs/ceph/caps.c
> +++ b/fs/ceph/caps.c
> @@ -3658,6 +3658,43 @@ static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
>   		iput(inode);
>   }
>   
> +void __ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap,
> +			   bool *wake_ci, bool *wake_mdsc)
> +{
> +	struct ceph_inode_info *ci = ceph_inode(inode);
> +	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
> +	bool ret;
> +
> +	lockdep_assert_held(&ci->i_ceph_lock);
> +
> +	dout("removing capsnap %p, inode %p ci %p\n", capsnap, inode, ci);
> +
> +	list_del_init(&capsnap->ci_item);
> +	ret = __detach_cap_flush_from_ci(ci, &capsnap->cap_flush);
> +	if (wake_ci)
> +		*wake_ci = ret;
> +
> +	spin_lock(&mdsc->cap_dirty_lock);
> +	if (list_empty(&ci->i_cap_flush_list))
> +		list_del_init(&ci->i_flushing_item);
> +
> +	ret = __detach_cap_flush_from_mdsc(mdsc, &capsnap->cap_flush);
> +	if (wake_mdsc)
> +		*wake_mdsc = ret;
> +	spin_unlock(&mdsc->cap_dirty_lock);
> +}
> +
> +void ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap,
> +			 bool *wake_ci, bool *wake_mdsc)
> +{
> +	struct ceph_inode_info *ci = ceph_inode(inode);
> +
> +	lockdep_assert_held(&ci->i_ceph_lock);
> +
> +	WARN_ON_ONCE(capsnap->dirty_pages || capsnap->writing);
> +	__ceph_remove_capsnap(inode, capsnap, wake_ci, wake_mdsc);
> +}
> +
>   /*
>    * Handle FLUSHSNAP_ACK.  MDS has flushed snap data to disk and we can
>    * throw away our cap_snap.
> @@ -3695,23 +3732,10 @@ static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
>   			     capsnap, capsnap->follows);
>   		}
>   	}
> -	if (flushed) {
> -		WARN_ON(capsnap->dirty_pages || capsnap->writing);
> -		dout(" removing %p cap_snap %p follows %lld\n",
> -		     inode, capsnap, follows);
> -		list_del(&capsnap->ci_item);
> -		wake_ci |= __detach_cap_flush_from_ci(ci, &capsnap->cap_flush);
> -
> -		spin_lock(&mdsc->cap_dirty_lock);
> -
> -		if (list_empty(&ci->i_cap_flush_list))
> -			list_del_init(&ci->i_flushing_item);
> -
> -		wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc,
> -							  &capsnap->cap_flush);
> -		spin_unlock(&mdsc->cap_dirty_lock);
> -	}
> +	if (flushed)
> +		ceph_remove_capsnap(inode, capsnap, &wake_ci, &wake_mdsc);
>   	spin_unlock(&ci->i_ceph_lock);
> +
>   	if (flushed) {
>   		ceph_put_snap_context(capsnap->context);
>   		ceph_put_cap_snap(capsnap);
> diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
> index df3a735f7837..df10f9b33660 100644
> --- a/fs/ceph/mds_client.c
> +++ b/fs/ceph/mds_client.c
> @@ -1604,10 +1604,32 @@ int ceph_iterate_session_caps(struct ceph_mds_session *session,
>   	return ret;
>   }
>   
> +static void remove_capsnaps(struct ceph_mds_client *mdsc, struct inode *inode)
> +{
> +	struct ceph_inode_info *ci = ceph_inode(inode);
> +	struct ceph_cap_snap *capsnap;
> +
> +	lockdep_assert_held(&ci->i_ceph_lock);
> +
> +	dout("removing capsnaps, ci is %p, inode is %p\n", ci, inode);
> +
> +	while (!list_empty(&ci->i_cap_snaps)) {
> +		capsnap = list_first_entry(&ci->i_cap_snaps,
> +					   struct ceph_cap_snap, ci_item);
> +		__ceph_remove_capsnap(inode, capsnap, NULL, NULL);
> +		ceph_put_snap_context(capsnap->context);
> +		ceph_put_cap_snap(capsnap);
> +		iput(inode);
> +	}
> +	wake_up_all(&ci->i_cap_wq);
> +	wake_up_all(&mdsc->cap_flushing_wq);
> +}
> +
>   static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
>   				  void *arg)
>   {
>   	struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
> +	struct ceph_mds_client *mdsc = fsc->mdsc;
>   	struct ceph_inode_info *ci = ceph_inode(inode);
>   	LIST_HEAD(to_remove);
>   	bool dirty_dropped = false;
> @@ -1619,7 +1641,6 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
>   	__ceph_remove_cap(cap, false);
>   	if (!ci->i_auth_cap) {
>   		struct ceph_cap_flush *cf;
> -		struct ceph_mds_client *mdsc = fsc->mdsc;
>   
>   		if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
>   			if (inode->i_data.nrpages > 0)
> @@ -1684,6 +1705,8 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
>   			ci->i_prealloc_cap_flush = NULL;
>   		}
>   	}
> +	if (!list_empty(&ci->i_cap_snaps))
> +		remove_capsnaps(mdsc, inode);
>   	spin_unlock(&ci->i_ceph_lock);
>   	while (!list_empty(&to_remove)) {
>   		struct ceph_cap_flush *cf;
> diff --git a/fs/ceph/super.h b/fs/ceph/super.h
> index 8f4f2747be65..445d13d760d1 100644
> --- a/fs/ceph/super.h
> +++ b/fs/ceph/super.h
> @@ -1169,6 +1169,12 @@ extern void ceph_put_cap_refs_no_check_caps(struct ceph_inode_info *ci,
>   					    int had);
>   extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
>   				       struct ceph_snap_context *snapc);
> +extern void __ceph_remove_capsnap(struct inode *inode,
> +				  struct ceph_cap_snap *capsnap,
> +				  bool *wake_ci, bool *wake_mdsc);
> +extern void ceph_remove_capsnap(struct inode *inode,
> +				struct ceph_cap_snap *capsnap,
> +				bool *wake_ci, bool *wake_mdsc);
>   extern void ceph_flush_snaps(struct ceph_inode_info *ci,
>   			     struct ceph_mds_session **psession);
>   extern bool __ceph_should_report_size(struct ceph_inode_info *ci);