linux-kernel - [PATCH v2 33/53] cachefiles: Add I/O error reporting macros

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Date:   Fri, 22 Oct 2021 20:06:42 +0100
From:   David Howells <dhowells@...hat.com>
To:     linux-cachefs@...hat.com
Cc:     dhowells@...hat.com, Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Jeff Layton <jlayton@...nel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Omar Sandoval <osandov@...ndov.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-afs@...ts.infradead.org, linux-nfs@...r.kernel.org,
        linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 33/53] cachefiles: Add I/O error reporting macros

Add a couple of macros to report I/O errors and to tell fscache that the
cache is in trouble.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: linux-cachefs@...hat.com
---

 fs/cachefiles/internal.h |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index d615213a2fa1..230a1a2bf01d 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -153,6 +153,26 @@ static inline int cachefiles_inject_remove_error(void)
 	return cachefiles_error_injection_state & 2 ? -EIO : 0;
 }
 
+/*
+ * error handling
+ */
+
+#define cachefiles_io_error(___cache, FMT, ...)		\
+do {							\
+	pr_err("I/O Error: " FMT"\n", ##__VA_ARGS__);	\
+	fscache_io_error((___cache)->cache);		\
+	set_bit(CACHEFILES_DEAD, &(___cache)->flags);	\
+} while (0)
+
+#define cachefiles_io_error_obj(object, FMT, ...)			\
+do {									\
+	struct cachefiles_cache *___cache;				\
+									\
+	___cache = (object)->volume->cache;				\
+	cachefiles_io_error(___cache, FMT " [o=%08x]", ##__VA_ARGS__,	\
+			    (object)->debug_id);			\
+} while (0)
+
 
 /*
  * debug tracing