iversion: add a routine to update a raw value with a larger one

Under ceph, clients can be independently updating iversion themselves,
while working under comprehensive sets of caps on an inode. In that
situation we always want to prefer the largest value of a change
attribute. Add a new function that will update a raw value with a larger
one, but otherwise leave it alone.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/include/linux/iversion.h b/include/linux/iversion.h
index be50ef7cedab..2917ef990d43 100644
--- a/include/linux/iversion.h
+++ b/include/linux/iversion.h
@@ -113,6 +113,30 @@ inode_peek_iversion_raw(const struct inode *inode)
 }
 
 /**
+ * inode_set_max_iversion_raw - update i_version new value is larger
+ * @inode: inode to set
+ * @val: new i_version to set
+ *
+ * Some self-managed filesystems (e.g Ceph) will only update the i_version
+ * value if the new value is larger than the one we already have.
+ */
+static inline void
+inode_set_max_iversion_raw(struct inode *inode, u64 val)
+{
+	u64 cur, old;
+
+	cur = inode_peek_iversion_raw(inode);
+	for (;;) {
+		if (cur > val)
+			break;
+		old = atomic64_cmpxchg(&inode->i_version, cur, val);
+		if (likely(old == cur))
+			break;
+		cur = old;
+	}
+}
+
+/**
  * inode_set_iversion - set i_version to a particular value
  * @inode: inode to set
  * @val: new i_version value to set