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authorSage Weil <sage@newdream.net>2010-03-09 12:59:08 -0800
committerSage Weil <sage@newdream.net>2010-03-20 21:33:08 -0700
commit8b218b8a4a65bf4e304ae8690cadb9100ef029c0 (patch)
tree0fcc54e0bfff4cea6bdbb73c391adc9763564a6b /fs/ceph/inode.c
parent052bb34af3bf8ae2001b9f03d884ba0def3e427c (diff)
downloadop-kernel-dev-8b218b8a4a65bf4e304ae8690cadb9100ef029c0.zip
op-kernel-dev-8b218b8a4a65bf4e304ae8690cadb9100ef029c0.tar.gz
ceph: fix inode removal from snap realm when racing with migration
When an inode was dropped while being migrated between two MDSs, i_cap_exporting_issued was non-zero such that issue caps were non-zero and __ceph_is_any_caps(ci) was true. This prevented the inode from being removed from the snap realm, even as it was dropped from the cache. Fix this by dropping any residual i_snap_realm ref in destroy_inode. Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/inode.c')
-rw-r--r--fs/ceph/inode.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 7abe1ae..aca82d5 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -378,6 +378,22 @@ void ceph_destroy_inode(struct inode *inode)
ceph_queue_caps_release(inode);
+ /*
+ * we may still have a snap_realm reference if there are stray
+ * caps in i_cap_exporting_issued or i_snap_caps.
+ */
+ if (ci->i_snap_realm) {
+ struct ceph_mds_client *mdsc =
+ &ceph_client(ci->vfs_inode.i_sb)->mdsc;
+ struct ceph_snap_realm *realm = ci->i_snap_realm;
+
+ dout(" dropping residual ref to snap realm %p\n", realm);
+ spin_lock(&realm->inodes_with_caps_lock);
+ list_del_init(&ci->i_snap_realm_item);
+ spin_unlock(&realm->inodes_with_caps_lock);
+ ceph_put_snap_realm(mdsc, realm);
+ }
+
kfree(ci->i_symlink);
while ((n = rb_first(&ci->i_fragtree)) != NULL) {
frag = rb_entry(n, struct ceph_inode_frag, node);
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