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Subject[PATCH 2/4] ceph: clear parent D_COMPLETE flag when on dentry prune
Date
When the VFS prunes a dentry from the cache, clear the D_COMPLETE flag
on the parent dentry. Do this for the live and snapshotted namespaces. Do
not bother for the .snap dir contents, since we do not cache that.

Signed-off-by: Sage Weil <sage@newdream.net>
---
fs/ceph/dir.c | 28 ++++++++++++++++++++++++++++
fs/ceph/super.h | 13 +++++++++++++
2 files changed, 41 insertions(+), 0 deletions(-)
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 1a867a3..e2005fa 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1053,7 +1053,33 @@ static int ceph_snapdir_d_revalidate(struct dentry *dentry,
return 1;
}

+/*
+ * When the VFS prunes a dentry from the cache, we need to clear the
+ * complete flag on the parent directory.
+ *
+ * Called under dentry->d_lock.
+ */
+static void ceph_d_prune(struct dentry *dentry)
+{
+ struct ceph_dentry_info *di;
+
+ dout("d_release %p\n", dentry);
+
+ /* do we have a valid parent? */
+ if (!dentry->d_parent || IS_ROOT(dentry))
+ return;
+
+ /* if we are not hashed, we don't affect D_COMPLETE */
+ if (d_unhashed(dentry))
+ return;

+ /*
+ * we hold d_lock, so d_parent is stable, and d_fsdata is never
+ * cleared until d_release
+ */
+ di = ceph_dentry(dentry->d_parent);
+ clear_bit(CEPH_D_COMPLETE, &di->flags);
+}

/*
* read() on a dir. This weird interface hack only works if mounted
@@ -1259,6 +1285,7 @@ const struct inode_operations ceph_dir_iops = {
const struct dentry_operations ceph_dentry_ops = {
.d_revalidate = ceph_d_revalidate,
.d_release = ceph_d_release,
+ .d_prune = ceph_d_prune,
};

const struct dentry_operations ceph_snapdir_dentry_ops = {
@@ -1268,4 +1295,5 @@ const struct dentry_operations ceph_snapdir_dentry_ops = {

const struct dentry_operations ceph_snap_dentry_ops = {
.d_release = ceph_d_release,
+ .d_prune = ceph_d_prune,
};
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 619fe71..b6bf098 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -201,6 +201,7 @@ struct ceph_inode_xattr {
* Ceph dentry state
*/
struct ceph_dentry_info {
+ unsigned long flags;
struct ceph_mds_session *lease_session;
u32 lease_gen, lease_shared_gen;
u32 lease_seq;
@@ -211,6 +212,18 @@ struct ceph_dentry_info {
u64 offset;
};

+/*
+ * dentry flags
+ *
+ * The locking for D_COMPLETE is a bit odd:
+ * - we can clear it at almost any time (see ceph_d_prune)
+ * - it is only meaningful if:
+ * - we hold dir inode i_lock
+ * - we hold dir FILE_SHARED caps
+ * - the dentry D_COMPLETE is set
+ */
+#define CEPH_D_COMPLETE 1 /* if set, d_u.d_subdirs is complete directory */
+
struct ceph_inode_xattrs_info {
/*
* (still encoded) xattr blob. we avoid the overhead of parsing
--
1.7.0


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