linux-kernel - [PATCH v3 1/4] fs: expand dump

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Message-ID: <20250911045557.1552002-2-mjguzik@gmail.com>
Date: Thu, 11 Sep 2025 06:55:54 +0200
From: Mateusz Guzik <mjguzik@...il.com>
To: brauner@...nel.org
Cc: viro@...iv.linux.org.uk,
	jack@...e.cz,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	josef@...icpanda.com,
	kernel-team@...com,
	amir73il@...il.com,
	linux-btrfs@...r.kernel.org,
	linux-ext4@...r.kernel.org,
	linux-xfs@...r.kernel.org,
	ocfs2-devel@...ts.linux.dev,
	Mateusz Guzik <mjguzik@...il.com>
Subject: [PATCH v3 1/4] fs: expand dump_inode()

This adds fs name and few fields from struct inode: i_mode, i_opflags,
i_flags and i_state.

All values printed raw, no attempt to pretty-print anything.

Compile tested on for i386 and runtime tested on amd64.

Sample output:
[   31.450263] VFS_WARN_ON_INODE("crap") encountered for inode ffff9b10837a3240
               fs sockfs mode 140777 opflags c flags 0 state 100

Signed-off-by: Mateusz Guzik <mjguzik@...il.com>
---
 fs/inode.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/inode.c b/fs/inode.c
index 833de5457a06..e8c712211822 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2935,10 +2935,18 @@ EXPORT_SYMBOL(mode_strip_sgid);
  *
  * TODO: add a proper inode dumping routine, this is a stub to get debug off the
  * ground.
+ *
+ * TODO: handle getting to fs type with get_kernel_nofault()?
+ * See dump_mapping() above.
  */
 void dump_inode(struct inode *inode, const char *reason)
 {
-	pr_warn("%s encountered for inode %px", reason, inode);
+	struct super_block *sb = inode->i_sb;
+
+	pr_warn("%s encountered for inode %px\n"
+		"fs %s mode %ho opflags %hx flags %u state %x\n",
+		reason, inode, sb->s_type->name, inode->i_mode, inode->i_opflags,
+		inode->i_flags, inode->i_state);
 }
 
 EXPORT_SYMBOL(dump_inode);
-- 
2.43.0