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-rw-r--r--fs/attr.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/fs/attr.c b/fs/attr.c
index 1449adb..267968d 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -167,7 +167,27 @@ void setattr_copy(struct inode *inode, const struct iattr *attr)
}
EXPORT_SYMBOL(setattr_copy);
-int notify_change(struct dentry * dentry, struct iattr * attr)
+/**
+ * notify_change - modify attributes of a filesytem object
+ * @dentry: object affected
+ * @iattr: new attributes
+ * @delegated_inode: returns inode, if the inode is delegated
+ *
+ * The caller must hold the i_mutex on the affected object.
+ *
+ * If notify_change discovers a delegation in need of breaking,
+ * it will return -EWOULDBLOCK and return a reference to the inode in
+ * delegated_inode. The caller should then break the delegation and
+ * retry. Because breaking a delegation may take a long time, the
+ * caller should drop the i_mutex before doing so.
+ *
+ * Alternatively, a caller may pass NULL for delegated_inode. This may
+ * be appropriate for callers that expect the underlying filesystem not
+ * to be NFS exported. Also, passing NULL is fine for callers holding
+ * the file open for write, as there can be no conflicting delegation in
+ * that case.
+ */
+int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **delegated_inode)
{
struct inode *inode = dentry->d_inode;
umode_t mode = inode->i_mode;
@@ -243,6 +263,9 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
error = security_inode_setattr(dentry, attr);
if (error)
return error;
+ error = try_break_deleg(inode, delegated_inode);
+ if (error)
+ return error;
if (inode->i_op->setattr)
error = inode->i_op->setattr(dentry, attr);
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