lsfd: choose anon_ops declarative way

Signed-off-by: Masatake YAMATO <yamato@redhat.com>

diff --git a/misc-utils/lsfd-unkn.c b/misc-utils/lsfd-unkn.c
index 087e31dad2f287eb39a143f6cfe04b4785fdd3e8..da616c6ccda39a0765500debaa87b9c1c82ee1a4 100644 (file)
--- a/misc-utils/lsfd-unkn.c
+++ b/misc-utils/lsfd-unkn.c
@@ -33,6 +33,7 @@ struct unkn {
 
 struct anon_ops {
        const char *class;
+       bool (*probe)(const char *);
        char * (*get_name)(struct unkn *);
        /* Return true is handled the column. */
        bool (*fill_column)(struct proc *,
@@ -46,8 +47,7 @@ struct anon_ops {
        int (*handle_fdinfo)(struct unkn *, const char *, const char *);
 };
 
-static const struct anon_ops anon_generic_ops;
-static const struct anon_ops anon_pidfd_ops;
+static const struct anon_ops *anon_probe(const char *);
 
 static char * anon_get_class(struct unkn *unkn)
 {
@@ -129,10 +129,7 @@ static void unkn_init_content(struct file *file)
            && strncmp(file->name, "anon_inode:", 11) == 0) {
                const char *rest = file->name + 11;
 
-               if (strncmp(rest, "[pidfd]", 7) == 0)
-                       unkn->anon_ops = &anon_pidfd_ops;
-               else
-                       unkn->anon_ops = &anon_generic_ops;
+               unkn->anon_ops = anon_probe(rest);
 
                if (unkn->anon_ops->init)
                        unkn->anon_ops->init(unkn);
@@ -166,6 +163,11 @@ struct anon_pidfd_data {
        char *nspid;
 };
 
+static bool anon_pidfd_probe(const char *str)
+{
+       return (strncmp(str, "[pidfd]", 7) == 0);
+}
+
 static char *anon_pidfd_get_name(struct unkn *unkn)
 {
        char *str = NULL;
@@ -253,6 +255,7 @@ static bool anon_pidfd_fill_column(struct proc *proc  __attribute__((__unused__)
 
 static const struct anon_ops anon_pidfd_ops = {
        .class = "pidfd",
+       .probe = anon_pidfd_probe,
        .get_name = anon_pidfd_get_name,
        .fill_column = anon_pidfd_fill_column,
        .init = anon_pidfd_init,
@@ -272,6 +275,18 @@ static const struct anon_ops anon_generic_ops = {
        .handle_fdinfo = NULL,
 };
 
+static const struct anon_ops *anon_ops[] = {
+       &anon_pidfd_ops,
+};
+
+static const struct anon_ops *anon_probe(const char *str)
+{
+       for (size_t i = 0; i < ARRAY_SIZE(anon_ops); i++)
+               if (anon_ops[i]->probe(str))
+                       return anon_ops[i];
+       return &anon_generic_ops;
+}
+
 const struct file_class unkn_class = {
        .super = &file_class,
        .size = sizeof(struct unkn),