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ceph: remove the capsnaps when removing caps

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capsnaps will take inode references via ihold when queueing to flush.
When force unmounting, the client will just close the sessions and
may never get a flush reply, causing a leak and inode ref leak.

Fix this by removing the capsnaps for an inode when removing the caps.

URL: https://tracker.ceph.com/issues/52295
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Xiubo Li 2021-08-25 21:45:43 +08:00 committed by Ilya Dryomov
parent b11ed50346
commit a6d37ccdd2
3 changed files with 87 additions and 18 deletions
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68
fs/ceph/caps.c
View file

@ -3159,7 +3159,16 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
break;
}
}
BUG_ON(!found);
if (!found) {
/*
* The capsnap should already be removed when removing
* auth cap in the case of a forced unmount.
*/
WARN_ON_ONCE(ci->i_auth_cap);
goto unlock;
}
capsnap->dirty_pages -= nr;
if (capsnap->dirty_pages == 0) {
complete_capsnap = true;
@ -3181,6 +3190,7 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
complete_capsnap ? " (complete capsnap)" : "");
}
unlock:
spin_unlock(&ci->i_ceph_lock);
if (last) {
@ -3651,6 +3661,43 @@ 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.
@ -3688,23 +3735,10 @@ 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);

31
fs/ceph/mds_client.c
View file

@ -1604,14 +1604,39 @@ int ceph_iterate_session_caps(struct ceph_mds_session *session,
return ret;
}
static int remove_capsnaps(struct ceph_mds_client *mdsc, struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_cap_snap *capsnap;
int capsnap_release = 0;
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);
capsnap_release++;
}
wake_up_all(&ci->i_cap_wq);
wake_up_all(&mdsc->cap_flushing_wq);
return capsnap_release;
}
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;
bool invalidate = false;
int capsnap_release = 0;
dout("removing cap %p, ci is %p, inode is %p\n",
cap, ci, &ci->vfs_inode);
@ -1619,7 +1644,6 @@ 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)
@ -1683,6 +1707,9 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
ci->i_prealloc_cap_flush = NULL;
}
if (!list_empty(&ci->i_cap_snaps))
capsnap_release = remove_capsnaps(mdsc, inode);
}
spin_unlock(&ci->i_ceph_lock);
while (!list_empty(&to_remove)) {
@ -1699,6 +1726,8 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
ceph_queue_invalidate(inode);
if (dirty_dropped)
iput(inode);
while (capsnap_release--)
iput(inode);
return 0;
}

6
fs/ceph/super.h
View file

@ -1163,6 +1163,12 @@ 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);