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vfs: add initial support for CONFIG_DEBUG_VFS

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Small collection of macros taken from mmdebug.h

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://lore.kernel.org/r/20250209185523.745956-2-mjguzik@gmail.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Mateusz Guzik 2025-02-09 19:55:20 +01:00 committed by Christian Brauner
parent 2014c95afe
commit 8b17e54096
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GPG Key ID: 91C61BC06578DCA2
4 changed files with 70 additions and 0 deletions
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15
fs/inode.c
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@ -2953,3 +2953,18 @@ umode_t mode_strip_sgid(struct mnt_idmap *idmap,
return mode & ~S_ISGID;
}
EXPORT_SYMBOL(mode_strip_sgid);
#ifdef CONFIG_DEBUG_VFS
/*
* Dump an inode.
*
* TODO: add a proper inode dumping routine, this is a stub to get debug off the
* ground.
*/
void dump_inode(struct inode *inode, const char *reason)
{
pr_warn("%s encountered for inode %px", reason, inode);
}
EXPORT_SYMBOL(dump_inode);
#endif

1
include/linux/fs.h
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@ -2,6 +2,7 @@
#ifndef _LINUX_FS_H
#define _LINUX_FS_H
#include <linux/vfsdebug.h>
#include <linux/linkage.h>
#include <linux/wait_bit.h>
#include <linux/kdev_t.h>

45
include/linux/vfsdebug.h Normal file
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@ -0,0 +1,45 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef LINUX_VFS_DEBUG_H
#define LINUX_VFS_DEBUG_H 1
#include <linux/bug.h>
struct inode;
#ifdef CONFIG_DEBUG_VFS
void dump_inode(struct inode *inode, const char *reason);
#define VFS_BUG_ON(cond) BUG_ON(cond)
#define VFS_WARN_ON(cond) (void)WARN_ON(cond)
#define VFS_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond)
#define VFS_WARN_ONCE(cond, format...) (void)WARN_ONCE(cond, format)
#define VFS_WARN(cond, format...) (void)WARN(cond, format)
#define VFS_BUG_ON_INODE(cond, inode) ({ \
if (unlikely(!!(cond))) { \
dump_inode(inode, "VFS_BUG_ON_INODE(" #cond")");\
BUG_ON(1); \
} \
})
#define VFS_WARN_ON_INODE(cond, inode) ({ \
int __ret_warn = !!(cond); \
\
if (unlikely(__ret_warn)) { \
dump_inode(inode, "VFS_WARN_ON_INODE(" #cond")");\
WARN_ON(1); \
} \
unlikely(__ret_warn); \
})
#else
#define VFS_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)
#define VFS_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)
#define VFS_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
#define VFS_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
#define VFS_WARN(cond, format...) BUILD_BUG_ON_INVALID(cond)
#define VFS_BUG_ON_INODE(cond, inode) VFS_BUG_ON(cond)
#define VFS_WARN_ON_INODE(cond, inode) BUILD_BUG_ON_INVALID(cond)
#endif /* CONFIG_DEBUG_VFS */
#endif

9
lib/Kconfig.debug
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@ -808,6 +808,15 @@ config ARCH_HAS_DEBUG_VM_PGTABLE
An architecture should select this when it can successfully
build and run DEBUG_VM_PGTABLE.
config DEBUG_VFS
bool "Debug VFS"
depends on DEBUG_KERNEL
help
Enable this to turn on extended checks in the VFS layer that may impact
performance.
If unsure, say N.
config DEBUG_VM_IRQSOFF
def_bool DEBUG_VM && !PREEMPT_RT