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From: Miklos Szeredi <miklos@szeredi.hu>
To: Al Viro <viro@zeniv.linux.org.uk>
Cc: Miklos Szeredi <mszeredi@redhat.com>,
	overlayfs <linux-unionfs@vger.kernel.org>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 09/11] vfs: factor out inode_insert5()
Date: Mon, 11 Jun 2018 13:32:30 +0200	[thread overview]
Message-ID: <20180611113230.GI23785@veci.piliscsaba.redhat.com> (raw)
In-Reply-To: <CAJfpegt5guR3zJeATw4-N41Ad2n9pcB5mQoLmSLOfocnEoodVg@mail.gmail.com>

On Mon, Jun 11, 2018 at 11:15:55AM +0200, Miklos Szeredi wrote:
> On Sun, Jun 10, 2018 at 8:02 AM, Al Viro <viro@zeniv.linux.org.uk> wrote:
> > On Sun, Jun 10, 2018 at 06:49:10AM +0100, Al Viro wrote:
> >> On Tue, May 29, 2018 at 04:41:41PM +0200, Miklos Szeredi wrote:
> >> > From: Miklos Szeredi <miklos@szeredi.hu>
> >> >
> >> > Split out common helper for race free insertion of an already allocated
> >> > inode into the cache.  Use this from iget5_locked() and
> >> > insert_inode_locked4().  Make iget5_locked() use new_inode()/iput() instead
> >> > of alloc_inode()/destroy_inode() directly.
> >>
> >> ... thus hitting the sucker with ->evict_inode(), in condition that is quite
> >> likely to be unfit to be seen by that.
> >>
> >> NAK.
> >
> > To clarify: objection here is against the switch to new_inode/iput.  The rest is
> > sane.  What makes new_inode() better here, anyway?
> 
> Umm, got to look into this.  The patch has already been pulled by
> Linus, but I hope it's salvageable.

Incremental follows.  I think it's cleaner to initialize i_state and i_sb_list
up front (hence the use of new_inode()), but could just as well add to sb list
afterwards.

---
diff --git a/fs/inode.c b/fs/inode.c
index 0df41bb77e0f..03c0d7c1296f 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1098,8 +1098,10 @@ struct inode *iget5_locked(struct super_block *sb, unsigned long hashval,
 
 		if (new) {
 			inode = inode_insert5(new, hashval, test, set, data);
-			if (unlikely(inode != new))
-				iput(new);
+			if (unlikely(inode != new)) {
+				inode_sb_list_del(inode);
+				destroy_inode(new);
+			}
 		}
 	}
 	return inode;

  reply	other threads:[~2018-06-11 11:32 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-29 14:41 [PATCH 00/11] overlayfs fixes Miklos Szeredi
2018-05-29 14:41 ` [PATCH 01/11] ovl: update documentation for unionmount-testsuite Miklos Szeredi
2018-05-29 14:41 ` [PATCH 02/11] ovl: remove WARN_ON() real inode attributes mismatch Miklos Szeredi
2018-05-29 14:41 ` [PATCH 03/11] ovl: strip debug argument from ovl_do_ helpers Miklos Szeredi
2018-05-29 14:41 ` [PATCH 04/11] ovl: struct cattr cleanups Miklos Szeredi
2018-05-29 14:41 ` [PATCH 05/11] ovl: return dentry from ovl_create_real() Miklos Szeredi
2018-05-29 15:24   ` Amir Goldstein
2018-05-30  8:28     ` Miklos Szeredi
2018-05-29 14:41 ` [PATCH 06/11] ovl: create helper ovl_create_temp() Miklos Szeredi
2018-05-29 14:41 ` [PATCH 07/11] ovl: make ovl_create_real() cope with vfs_mkdir() safely Miklos Szeredi
2018-05-29 15:29   ` Amir Goldstein
2018-05-30  8:18     ` Miklos Szeredi
2018-05-29 14:41 ` [PATCH 08/11] ovl: clean up copy-up error paths Miklos Szeredi
2018-05-29 14:41 ` [PATCH 09/11] vfs: factor out inode_insert5() Miklos Szeredi
2018-06-10  5:49   ` Al Viro
2018-06-10  6:02     ` Al Viro
2018-06-11  9:15       ` Miklos Szeredi
2018-06-11 11:32         ` Miklos Szeredi [this message]
2018-06-11 16:43           ` Al Viro
2018-06-12 12:38             ` Miklos Szeredi
2018-05-29 14:41 ` [PATCH 10/11] ovl: Pass argument to ovl_get_inode() in a structure Miklos Szeredi
2018-05-29 14:41 ` [PATCH 11/11] ovl: use inode_insert5() to hash a newly created inode Miklos Szeredi

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