linux-kernel - Re: [GIT PULL] bcachefs

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Date:   Fri, 11 Aug 2023 09:21:41 -0400
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Christian Brauner <brauner@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-bcachefs@...r.kernel.org, djwong@...nel.org,
        dchinner@...hat.com, sandeen@...hat.com, willy@...radead.org,
        josef@...icpanda.com, tytso@....edu, bfoster@...hat.com,
        jack@...e.cz, andreas.gruenbacher@...il.com, peterz@...radead.org,
        akpm@...ux-foundation.org, dhowells@...hat.com, snitzer@...nel.org,
        axboe@...nel.dk
Subject: Re: [GIT PULL] bcachefs

On Fri, Aug 11, 2023 at 12:54:42PM +0200, Christian Brauner wrote:
> > I don't want to do that to Christian either, I think highly of the work
> > he's been doing and I don't want to be adding to his frustration. So I
> > apologize for loosing my cool earlier; a lot of that was frustration
> > from other threads spilling over.
> > 
> > But: if he's going to be raising objections, I need to know what his
> > concerns are if we're going to get anywhere. Raising objections without
> > saying what the concerns are shuts down discussion; I don't think it's
> > unreasonable to ask people not to do that, and to try and stay focused
> > on the code.
> 
> The technical aspects were made clear off-list and I believe multiple
> times on-list by now. Any VFS and block related patches are to be
> reviewed and accepted before bcachefs gets merged.

Here's the one VFS patch in the series - could we at least get an ack
for this? It's a new helper, just breaks the existing d_tmpfile() up
into two functions - I hope we can at least agree that this patch
shouldn't be controversial?

-->--
Subject: [PATCH] fs: factor out d_mark_tmpfile()

New helper for bcachefs - bcachefs doesn't want the
inode_dec_link_count() call that d_tmpfile does, it handles i_nlink on
its own atomically with other btree updates

Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Christian Brauner <brauner@...nel.org>
Cc: linux-fsdevel@...r.kernel.org

diff --git a/fs/dcache.c b/fs/dcache.c
index 52e6d5fdab..dbdafa2617 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -3249,11 +3249,10 @@ void d_genocide(struct dentry *parent)
 
 EXPORT_SYMBOL(d_genocide);
 
-void d_tmpfile(struct file *file, struct inode *inode)
+void d_mark_tmpfile(struct file *file, struct inode *inode)
 {
 	struct dentry *dentry = file->f_path.dentry;
 
-	inode_dec_link_count(inode);
 	BUG_ON(dentry->d_name.name != dentry->d_iname ||
 		!hlist_unhashed(&dentry->d_u.d_alias) ||
 		!d_unlinked(dentry));
@@ -3263,6 +3262,15 @@ void d_tmpfile(struct file *file, struct inode *inode)
 				(unsigned long long)inode->i_ino);
 	spin_unlock(&dentry->d_lock);
 	spin_unlock(&dentry->d_parent->d_lock);
+}
+EXPORT_SYMBOL(d_mark_tmpfile);
+
+void d_tmpfile(struct file *file, struct inode *inode)
+{
+	struct dentry *dentry = file->f_path.dentry;
+
+	inode_dec_link_count(inode);
+	d_mark_tmpfile(file, inode);
 	d_instantiate(dentry, inode);
 }
 EXPORT_SYMBOL(d_tmpfile);
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 6b351e009f..3da2f0545d 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -251,6 +251,7 @@ extern struct dentry * d_make_root(struct inode *);
 /* <clickety>-<click> the ramfs-type tree */
 extern void d_genocide(struct dentry *);
 
+extern void d_mark_tmpfile(struct file *, struct inode *);
 extern void d_tmpfile(struct file *, struct inode *);
 
 extern struct dentry *d_find_alias(struct inode *);