[PATCH 2/8] libkmod: Allow to ignore log message on module removal

[Lucas De Marchi <lucas.de.marchi@gmail.com>]

Caller may want to handle retries, in which case the log message is not
appropriate.

Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>
---
 libkmod/libkmod-module.c | 13 +++++++++----
 libkmod/libkmod.h        |  2 ++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/libkmod/libkmod-module.c b/libkmod/libkmod-module.c
index efdd679..12d8ed1 100644
--- a/libkmod/libkmod-module.c
+++ b/libkmod/libkmod-module.c
@@ -823,11 +823,13 @@ extern long delete_module(const char *name, unsigned int flags);
 /**
  * kmod_module_remove_module:
  * @mod: kmod module
- * @flags: flags to pass to Linux kernel when removing the module. The only valid flag is
+ * @flags: flags used when removing the module.
  * KMOD_REMOVE_FORCE: force remove module regardless if it's still in
- * use by a kernel subsystem or other process;
- * KMOD_REMOVE_NOWAIT is always enforced, causing us to pass O_NONBLOCK to
+ * use by a kernel subsystem or other process; passed directly to Linux kernel
+ * KMOD_REMOVE_NOWAIT: is always enforced, causing us to pass O_NONBLOCK to
  * delete_module(2).
+ * KMOD_REMOVE_NOLOG: when module removal fails, do not log anything as the
+ * caller may want to handle retries and log when appropriate.
  *
  * Remove a module from Linux kernel.
  *
@@ -836,6 +838,8 @@ extern long delete_module(const char *name, unsigned int flags);
 KMOD_EXPORT int kmod_module_remove_module(struct kmod_module *mod,
 							unsigned int flags)
 {
+	unsigned int libkmod_flags = flags & 0xff;
+
 	int err;
 
 	if (mod == NULL)
@@ -848,7 +852,8 @@ KMOD_EXPORT int kmod_module_remove_module(struct kmod_module *mod,
 	err = delete_module(mod->name, flags);
 	if (err != 0) {
 		err = -errno;
-		ERR(mod->ctx, "could not remove '%s': %m\n", mod->name);
+		if (!(libkmod_flags & KMOD_REMOVE_NOLOG))
+			ERR(mod->ctx, "could not remove '%s': %m\n", mod->name);
 	}
 
 	return err;
diff --git a/libkmod/libkmod.h b/libkmod/libkmod.h
index fed216b..7251aa7 100644
--- a/libkmod/libkmod.h
+++ b/libkmod/libkmod.h
@@ -145,6 +145,8 @@ struct kmod_module *kmod_module_get_module(const struct kmod_list *entry);
 enum kmod_remove {
 	KMOD_REMOVE_FORCE = O_TRUNC,
 	KMOD_REMOVE_NOWAIT = O_NONBLOCK, /* always set */
+	/* libkmod-only defines, not passed to kernel */
+	KMOD_REMOVE_NOLOG = 1,
 };
 
 /* Insertion flags */
-- 
2.36.1