summaryrefslogtreecommitdiffstats
path: root/kernel/include/linux/seq_file.h
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/include/linux/seq_file.h')
-rw-r--r--kernel/include/linux/seq_file.h35
1 files changed, 35 insertions, 0 deletions
diff --git a/kernel/include/linux/seq_file.h b/kernel/include/linux/seq_file.h
index afbb1fd77..7848473a5 100644
--- a/kernel/include/linux/seq_file.h
+++ b/kernel/include/linux/seq_file.h
@@ -148,6 +148,41 @@ static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
#endif
}
+/**
+ * seq_show_options - display mount options with appropriate escapes.
+ * @m: the seq_file handle
+ * @name: the mount option name
+ * @value: the mount option name's value, can be NULL
+ */
+static inline void seq_show_option(struct seq_file *m, const char *name,
+ const char *value)
+{
+ seq_putc(m, ',');
+ seq_escape(m, name, ",= \t\n\\");
+ if (value) {
+ seq_putc(m, '=');
+ seq_escape(m, value, ", \t\n\\");
+ }
+}
+
+/**
+ * seq_show_option_n - display mount options with appropriate escapes
+ * where @value must be a specific length.
+ * @m: the seq_file handle
+ * @name: the mount option name
+ * @value: the mount option name's value, cannot be NULL
+ * @length: the length of @value to display
+ *
+ * This is a macro since this uses "length" to define the size of the
+ * stack buffer.
+ */
+#define seq_show_option_n(m, name, value, length) { \
+ char val_buf[length + 1]; \
+ strncpy(val_buf, value, length); \
+ val_buf[length] = '\0'; \
+ seq_show_option(m, name, val_buf); \
+}
+
#define SEQ_START_TOKEN ((void *)1)
/*
* Helpers for iteration over list_head-s in seq_files