linux-kernel - [PATCH 4/8] pstore: Alert on backend write error

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Date:   Thu,  6 Oct 2022 19:42:08 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:     kernel-dev@...lia.com, kernel@...ccoli.net, keescook@...omium.org,
        anton@...msg.org, ccross@...roid.com, tony.luck@...el.com,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>
Subject: [PATCH 4/8] pstore: Alert on backend write error

The pstore dump function doesn't alert at all on errors - despite
pstore is usually a last resource and if it fails users won't be
able to read the kernel log, this is not the case for server users
with serial access, for example.

So, let's at least attempt to inform such advanced users on the first
backend writing error detected during the kmsg dump - this is also
very useful for pstore debugging purposes.

Signed-off-by: Guilherme G. Piccoli <gpiccoli@...lia.com>
---
 fs/pstore/platform.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 06c2c66af332..ee50812fdd2e 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -463,6 +463,9 @@ static void pstore_dump(struct kmsg_dumper *dumper,
 		if (ret == 0 && reason == KMSG_DUMP_OOPS) {
 			pstore_new_entry = 1;
 			pstore_timer_kick();
+		} else {
+			pr_err_once("backend (%s) writing error (%d)\n",
+				    psinfo->name, ret);
 		}
 
 		total += record.size;
-- 
2.38.0