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authorYan, Zheng <zheng.z.yan@intel.com>2013-07-24 08:22:11 +0400
committerSage Weil <sage@inktank.com>2013-08-10 04:55:32 +0400
commit6f60f889470aecf747610279545c054a99aadca3 (patch)
tree60f5781c7673d1d0e06ef1b658e652b2738daf24 /fs/ceph
parent4d1829a59de402fc95daf4576c51aa0a7439aee8 (diff)
downloadlinux-6f60f889470aecf747610279545c054a99aadca3.tar.xz
ceph: fix freeing inode vs removing session caps race
remove_session_caps() uses iterate_session_caps() to remove caps, but iterate_session_caps() skips inodes that are being deleted. So session->s_nr_caps can be non-zero after iterate_session_caps() return. We can fix the issue by waiting until deletions are complete. __wait_on_freeing_inode() is designed for the job, but it is not exported, so we use lookup inode function to access it. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/inode.c8
-rw-r--r--fs/ceph/mds_client.c31
-rw-r--r--fs/ceph/super.h2
3 files changed, 41 insertions, 0 deletions
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 55aaddb4047e..3b0abed667c2 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -61,6 +61,14 @@ struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
return inode;
}
+struct inode *ceph_lookup_inode(struct super_block *sb, struct ceph_vino vino)
+{
+ struct inode *inode;
+ ino_t t = ceph_vino_to_ino(vino);
+ inode = ilookup5_nowait(sb, t, ceph_ino_compare, &vino);
+ return inode;
+}
+
/*
* get/constuct snapdir inode for a given directory
*/
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 6b40d8112c64..cbf08203e00d 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1031,6 +1031,37 @@ 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);
+
+ spin_lock(&session->s_cap_lock);
+ if (session->s_nr_caps > 0) {
+ struct super_block *sb = session->s_mdsc->fsc->sb;
+ struct inode *inode;
+ struct ceph_cap *cap, *prev = NULL;
+ struct ceph_vino vino;
+ /*
+ * iterate_session_caps() skips inodes that are being
+ * deleted, we need to wait until deletions are complete.
+ * __wait_on_freeing_inode() is designed for the job,
+ * but it is not exported, so use lookup inode function
+ * to access it.
+ */
+ while (!list_empty(&session->s_caps)) {
+ cap = list_entry(session->s_caps.next,
+ struct ceph_cap, session_caps);
+ if (cap == prev)
+ break;
+ prev = cap;
+ vino = cap->ci->i_vino;
+ spin_unlock(&session->s_cap_lock);
+
+ inode = ceph_lookup_inode(sb, vino);
+ iput(inode);
+
+ spin_lock(&session->s_cap_lock);
+ }
+ }
+ spin_unlock(&session->s_cap_lock);
+
BUG_ON(session->s_nr_caps > 0);
BUG_ON(!list_empty(&session->s_cap_flushing));
cleanup_cap_releases(session);
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index cbded572345e..afcd62a68916 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -677,6 +677,8 @@ extern void ceph_destroy_inode(struct inode *inode);
extern struct inode *ceph_get_inode(struct super_block *sb,
struct ceph_vino vino);
+extern struct inode *ceph_lookup_inode(struct super_block *sb,
+ struct ceph_vino vino);
extern struct inode *ceph_get_snapdir(struct inode *parent);
extern int ceph_fill_file_size(struct inode *inode, int issued,
u32 truncate_seq, u64 truncate_size, u64 size);