linux-kernel - Re: [PATCH 24/24] HWPOISON: show corrupted file info

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Message-ID: <20091202133753.GF13277@localhost>
Date:	Wed, 2 Dec 2009 21:37:53 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 24/24] HWPOISON: show corrupted file info

On Wed, Dec 02, 2009 at 09:20:48PM +0800, Andi Kleen wrote:
> > +	dentry = d_find_alias(inode);
> > +
> > +	if (dentry) {
> > +		spin_lock(&dentry->d_lock);
> > +		name = dentry->d_name.name;
> > +	}
> 
> The standard way to do that is d_path()

Good idea.

> But the paths are somewhat meaningless without the root.

It would still be more helpful :)

> Better to not print path names for now.

OK.

> And pgoff should be just a byte offset with a range

Makes sense.


btw, I have a patch (maybe out of date) to allow calling d_path()
without a known root:


Subject: vfs: enable __d_path() to handle NULL vfsmnt

Enable __d_path() to handle vfsmnt==NULL case.

This can happen when the caller only have a struct inode/dentry instead of a
struct file, and still want to print the (partial) path within the filesystem.

Signed-off-by: Wu Fengguang <wfg@...l.ustc.edu.cn>
---

---
 fs/dcache.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- linux-2.6.orig/fs/dcache.c
+++ linux-2.6/fs/dcache.c
@@ -1943,7 +1943,10 @@ char *__d_path(const struct path *path, 
 
 		if (dentry == root->dentry && vfsmnt == root->mnt)
 			break;
-		if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
+		if (unlikely(!vfsmnt)) {
+			if (IS_ROOT(dentry))
+				break;
+		} else if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
 			/* Global root? */
 			if (vfsmnt->mnt_parent == vfsmnt) {
 				goto global_root;
--
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