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From: David Howells <dhowells@redhat.com>
To: linux-cachefs@redhat.com
Cc: dhowells@redhat.com, Trond Myklebust <trondmy@hammerspace.com>,
	Anna Schumaker <anna.schumaker@netapp.com>,
	Steve French <smfrench@gmail.com>,
	Dominique Martinet <asmadeus@codewreck.org>,
	Jeff Layton <jlayton@kernel.org>,
	Matthew Wilcox <willy@infradead.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Omar Sandoval <osandov@osandov.com>,
	JeffleXu <jefflexu@linux.alibaba.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org,
	linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org,
	v9fs-developer@lists.sourceforge.net,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 05/11] cachefiles: Trace active-mark failure
Date: Tue, 18 Jan 2022 13:54:06 +0000	[thread overview]
Message-ID: <164251404666.3435901.17331742792401482190.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <164251396932.3435901.344517748027321142.stgit@warthog.procyon.org.uk>

Add a tracepoint to log failure to apply an active mark to a file in
addition to tracing successfully setting and unsetting the mark.

Also include the backing file inode number in the message logged to dmesg.

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

 fs/cachefiles/namei.c             |    4 +++-
 include/trace/events/cachefiles.h |   21 +++++++++++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index 52c9f0864a87..f256c8aff7bb 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -25,7 +25,9 @@ static bool __cachefiles_mark_inode_in_use(struct cachefiles_object *object,
 		trace_cachefiles_mark_active(object, inode);
 		can_use = true;
 	} else {
-		pr_notice("cachefiles: Inode already in use: %pd\n", dentry);
+		trace_cachefiles_mark_failed(object, inode);
+		pr_notice("cachefiles: Inode already in use: %pd (B=%lx)\n",
+			  dentry, inode->i_ino);
 	}
 
 	return can_use;
diff --git a/include/trace/events/cachefiles.h b/include/trace/events/cachefiles.h
index 093c4acb7a3a..c6f5aa74db89 100644
--- a/include/trace/events/cachefiles.h
+++ b/include/trace/events/cachefiles.h
@@ -573,6 +573,27 @@ TRACE_EVENT(cachefiles_mark_active,
 		      __entry->obj, __entry->inode)
 	    );
 
+TRACE_EVENT(cachefiles_mark_failed,
+	    TP_PROTO(struct cachefiles_object *obj,
+		     struct inode *inode),
+
+	    TP_ARGS(obj, inode),
+
+	    /* Note that obj may be NULL */
+	    TP_STRUCT__entry(
+		    __field(unsigned int,		obj		)
+		    __field(ino_t,			inode		)
+			     ),
+
+	    TP_fast_assign(
+		    __entry->obj	= obj ? obj->debug_id : 0;
+		    __entry->inode	= inode->i_ino;
+			   ),
+
+	    TP_printk("o=%08x B=%lx",
+		      __entry->obj, __entry->inode)
+	    );
+
 TRACE_EVENT(cachefiles_mark_inactive,
 	    TP_PROTO(struct cachefiles_object *obj,
 		     struct inode *inode),



  parent reply	other threads:[~2022-01-18 13:54 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-18 13:52 [PATCH 00/11] fscache, cachefiles: Rewrite fixes/updates David Howells
2022-01-18 13:53 ` [PATCH 01/11] fscache: Fix the volume collision wait condition David Howells
2022-01-18 13:53 ` [PATCH 02/11] cachefiles: Calculate the blockshift in terms of bytes, not pages David Howells
2022-01-21 17:47   ` Jeff Layton
2022-01-18 13:53 ` [PATCH 03/11] cachefiles: set default tag name if it's unspecified David Howells
2022-01-21 17:51   ` Jeff Layton
2022-01-18 13:53 ` [PATCH 04/11] cachefiles: Make some tracepoint adjustments David Howells
2022-01-21 17:52   ` Jeff Layton
2022-01-18 13:54 ` David Howells [this message]
2022-01-21 17:53   ` [PATCH 05/11] cachefiles: Trace active-mark failure Jeff Layton
2022-01-18 13:54 ` [PATCH 06/11] cachefiles: Explain checks in a comment David Howells
2022-01-18 13:54 ` [PATCH 07/11] cachefiles: Check that the backing filesystem supports tmpfiles David Howells
2022-01-18 13:54 ` [PATCH 08/11] fscache: Add a comment explaining how page-release optimisation works David Howells
2022-01-18 13:54 ` [PATCH 09/11] vfs, fscache: Add an IS_KERNEL_FILE() macro for the S_KERNEL_FILE flag David Howells
2022-01-18 16:23   ` Christoph Hellwig
2022-01-18 17:40   ` David Howells
2022-01-19  5:20     ` Christoph Hellwig
2022-01-19  9:18     ` David Howells
2022-01-19 11:15       ` Christian Brauner
2022-01-20  9:08       ` Christoph Hellwig
2022-01-20  9:37       ` David Howells
2022-01-18 13:55 ` [PATCH 10/11] netfs: Make ops->init_rreq() optional David Howells
2022-01-18 13:55 ` [PATCH 11/11] cifs: Support fscache indexing rewrite David Howells
2022-01-19  5:31   ` Steve French
2022-01-19  5:44   ` Steve French
2022-01-19  8:32   ` David Howells
2022-01-19  9:48     ` Shyam Prasad N
2022-01-19 10:38     ` David Howells

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