From nobody Fri Nov 29 10:28:01 2024 Received: from out-187.mta1.migadu.com (out-187.mta1.migadu.com [95.215.58.187]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 95FE2197A9E for ; Mon, 23 Sep 2024 10:49:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.187 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727088570; cv=none; b=ibqAJQppur4/GvNJs3ZiwzvxhA1ZvUnj9xMFp7g8jU1PZCBuU8hTKzkgzNpfZP4fls80Kc89doH+BG9z4hQ9hERVACPd5FglIOIOrDqQR7qcRTMNJ3gsmitvD+pyK6EjGuwI1DUZSCjwWNCLJB1wY7i4tXr3zBUMHGPc4k2JuOk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727088570; c=relaxed/simple; bh=7KWMRCfLshJan+v1YjbxtnHR81BOQimjwuapGh0YCt8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ch9CgTGpVXqMKK2gG7uAd1TJ+P/9HL3R4SC6iaNRHgVzNWcQJ+gCgFh5g4/Mg7tS+CuZb+ayljVmh/JtcvemoF8Vu98unHpVBvhqUOVbj0TbzmT8pCX0pbtgc4EyPpsP+EMWogv3BITlU37IqwJ1fMfefG7Mh4UbS2zr56+qc3E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=C9zgBXGN; arc=none smtp.client-ip=95.215.58.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="C9zgBXGN" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1727088566; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0el6xdbuEtFnFMlbAu4zA1Zhc8E2Sw9sLTTq195ArnA=; b=C9zgBXGNgF11TSAoOFJbOP+73/afONE/qTKlc1UrkNi021PD0EtS6ADpQ357pnNFob4yuv 6xBNnk4v06C6Pocy8zCH/tkVf1c/jZsSHq0Hrb+WHDmQR7phPJZ8r3X6d6LWqpQt6GyEPE SLEyKBVFeZ31eu6/IpOVZIjbLRyMTHU= From: "Luis Henriques (SUSE)" To: Theodore Ts'o , Andreas Dilger , Jan Kara , Harshad Shirwadkar Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, "Luis Henriques (SUSE)" Subject: [PATCH v2 1/2] ext4: use handle to mark fc as ineligible in __track_dentry_update() Date: Mon, 23 Sep 2024 11:49:08 +0100 Message-ID: <20240923104909.18342-2-luis.henriques@linux.dev> In-Reply-To: <20240923104909.18342-1-luis.henriques@linux.dev> References: <20240923104909.18342-1-luis.henriques@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" Calling ext4_fc_mark_ineligible() with a NULL handle is racy and may result in a fast-commit being done before the filesystem is effectively marked as ineligible. This patch fixes the calls to this function in __track_dentry_update() by adding an extra parameter to the callback used in ext4_fc_track_template(). Suggested-by: Jan Kara Signed-off-by: Luis Henriques (SUSE) Reviewed-by: Jan Kara --- fs/ext4/fast_commit.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c index 3926a05eceee..c330efd771d1 100644 --- a/fs/ext4/fast_commit.c +++ b/fs/ext4/fast_commit.c @@ -372,7 +372,7 @@ void ext4_fc_mark_ineligible(struct super_block *sb, in= t reason, handle_t *handl */ static int ext4_fc_track_template( handle_t *handle, struct inode *inode, - int (*__fc_track_fn)(struct inode *, void *, bool), + int (*__fc_track_fn)(handle_t *handle, struct inode *, void *, bool), void *args, int enqueue) { bool update =3D false; @@ -389,7 +389,7 @@ static int ext4_fc_track_template( ext4_fc_reset_inode(inode); ei->i_sync_tid =3D tid; } - ret =3D __fc_track_fn(inode, args, update); + ret =3D __fc_track_fn(handle, inode, args, update); mutex_unlock(&ei->i_fc_lock); =20 if (!enqueue) @@ -413,7 +413,8 @@ struct __track_dentry_update_args { }; =20 /* __track_fn for directory entry updates. Called with ei->i_fc_lock. */ -static int __track_dentry_update(struct inode *inode, void *arg, bool upda= te) +static int __track_dentry_update(handle_t *handle, struct inode *inode, + void *arg, bool update) { struct ext4_fc_dentry_update *node; struct ext4_inode_info *ei =3D EXT4_I(inode); @@ -428,14 +429,14 @@ static int __track_dentry_update(struct inode *inode,= void *arg, bool update) =20 if (IS_ENCRYPTED(dir)) { ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_ENCRYPTED_FILENAME, - NULL); + handle); mutex_lock(&ei->i_fc_lock); return -EOPNOTSUPP; } =20 node =3D kmem_cache_alloc(ext4_fc_dentry_cachep, GFP_NOFS); if (!node) { - ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_NOMEM, NULL); + ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_NOMEM, handle); mutex_lock(&ei->i_fc_lock); return -ENOMEM; } @@ -447,7 +448,7 @@ static int __track_dentry_update(struct inode *inode, v= oid *arg, bool update) node->fcd_name.name =3D kmalloc(dentry->d_name.len, GFP_NOFS); if (!node->fcd_name.name) { kmem_cache_free(ext4_fc_dentry_cachep, node); - ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_NOMEM, NULL); + ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_NOMEM, handle); mutex_lock(&ei->i_fc_lock); return -ENOMEM; } @@ -569,7 +570,8 @@ void ext4_fc_track_create(handle_t *handle, struct dent= ry *dentry) } =20 /* __track_fn for inode tracking */ -static int __track_inode(struct inode *inode, void *arg, bool update) +static int __track_inode(handle_t *handle, struct inode *inode, void *arg, + bool update) { if (update) return -EEXIST; @@ -607,7 +609,8 @@ struct __track_range_args { }; =20 /* __track_fn for tracking data updates */ -static int __track_range(struct inode *inode, void *arg, bool update) +static int __track_range(handle_t *handle, struct inode *inode, void *arg, + bool update) { struct ext4_inode_info *ei =3D EXT4_I(inode); ext4_lblk_t oldstart;