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Date:   Wed, 11 Nov 2020 16:52:11 -0500
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     dhowells@...hat.com
Cc:     viro@...iv.linux.org.uk, tytso@....edu, khazhy@...gle.com,
        adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        kernel@...labora.com
Subject: [PATCH RFC v2 6/8] fs: Add more superblock error subtypes

Expose new SB notification subtype for warnings, errors and general
messages.  This is modeled after the information exposed by ext4, but
should be the same for other filesystems.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
 include/linux/fs.h               | 56 ++++++++++++++++++++++++++++++++
 include/uapi/linux/watch_queue.h | 17 ++++++++++
 2 files changed, 73 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 81aaa673ada7..9c241689d8bc 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3533,6 +3533,62 @@ static inline int notify_sb_error(struct super_block *s, const char *function, i
 	return error;
 }
 
+/**
+ * notify_sb_warning: Post superblock warning notification.
+ * @s: The superblock the notification is about.
+ * @function: function name reported as source of the warning.
+ * @line: source code line reported as source of the warning.
+ * @inode: The inode the error refers to (if available, 0 otherwise)
+ * @block: The block the error refers to (if available, 0 otherwise)
+ * @fmt: Formating string for extra information appended to the notification
+ * @args: arguments for extra information string appended to the notification
+ */
+static inline void notify_sb_warning(struct super_block *s, const char *function,
+				     int line, u64 inode, u64 block,
+				     const char *fmt, va_list *args)
+{
+#ifdef CONFIG_SB_NOTIFICATIONS
+	if (unlikely(s->s_watchers)) {
+		struct superblock_error_notification n = {
+			.s.watch.type	= WATCH_TYPE_SB_NOTIFY,
+			.s.watch.subtype = NOTIFY_SUPERBLOCK_WARNING,
+			.s.watch.info	= watch_sizeof(n),
+			.s.sb_id	= s->s_unique_id,
+			.inode		= inode,
+			.block		= block,
+			.line		= line,
+		};
+
+		memcpy(&n.function, function, SB_NOTIFICATION_FNAME_LEN);
+		n.function[SB_NOTIFICATION_FNAME_LEN-1] = '\0';
+
+		post_sb_notification(s, &n.s, fmt, args);
+	}
+#endif
+}
+
+/**
+ * notify_sb_msg: Post superblock message.
+ * @s: The superblock the notification is about.
+ * @fmt: Formating string for extra information appended to the notification
+ * @args: arguments for extra information string appended to the notification
+ */
+static inline void notify_sb_msg(struct super_block *s, const char *fmt, va_list *args)
+{
+#ifdef CONFIG_SB_NOTIFICATIONS
+	if (unlikely(s->s_watchers)) {
+		struct superblock_msg_notification n = {
+			.s.watch.type	= WATCH_TYPE_SB_NOTIFY,
+			.s.watch.subtype = NOTIFY_SUPERBLOCK_MSG,
+			.s.watch.info	= watch_sizeof(n),
+			.s.sb_id	= s->s_unique_id,
+		};
+
+		post_sb_notification(s, &n.s, fmt, args);
+	}
+#endif
+}
+
 /**
  * notify_sb_EDQUOT: Post superblock quota overrun notification.
  * @s: The superblock the notification is about.
diff --git a/include/uapi/linux/watch_queue.h b/include/uapi/linux/watch_queue.h
index 5fa5286c5cc7..c4afd545e234 100644
--- a/include/uapi/linux/watch_queue.h
+++ b/include/uapi/linux/watch_queue.h
@@ -110,6 +110,9 @@ enum superblock_notification_type {
 	NOTIFY_SUPERBLOCK_ERROR		= 1, /* Error in filesystem or blockdev */
 	NOTIFY_SUPERBLOCK_EDQUOT	= 2, /* EDQUOT notification */
 	NOTIFY_SUPERBLOCK_NETWORK	= 3, /* Network status change */
+	NOTIFY_SUPERBLOCK_MSG		= 4, /* Filesystem message */
+	NOTIFY_SUPERBLOCK_WARNING	= 5, /* Filesystem warning */
+
 };
 
 #define NOTIFY_SUPERBLOCK_IS_NOW_RO	WATCH_INFO_FLAG_0 /* Superblock changed to R/O */
@@ -136,4 +139,18 @@ struct superblock_error_notification {
 	char	desc[0];
 };
 
+struct superblock_msg_notification {
+	struct superblock_notification s; /* subtype = notify_superblock_msg */
+	char desc[0];
+};
+
+struct superblock_warning_notification {
+	struct superblock_notification s; /* subtype = notify_superblock_warning */
+	__u64	inode;
+	__u64	block;
+	char	function[SB_NOTIFICATION_FNAME_LEN];
+	__u16	line;
+	char desc[0];
+};
+
 #endif /* _UAPI_LINUX_WATCH_QUEUE_H */
-- 
2.29.2

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