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15.21.0139.009; Mon, 22 Jun 2026 10:06:30 +0000 Message-ID: Date: Mon, 22 Jun 2026 18:06:23 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 3/4] ext4: introduce ext4_put_ea_inode() for safe deferred iput To: Jan Kara Cc: tytso@mit.edu, adilger.kernel@dilger.ca, libaokun@linux.alibaba.com, ojaswin@linux.ibm.com, ritesh.list@gmail.com, yi.zhang@huawei.com, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260616151558.1728881-1-yun.zhou@windriver.com> <20260616151558.1728881-4-yun.zhou@windriver.com> Content-Language: en-US From: "Zhou, Yun" In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: TYCP301CA0069.JPNP301.PROD.OUTLOOK.COM (2603:1096:405:7d::9) To CH0PR11MB5332.namprd11.prod.outlook.com (2603:10b6:610:bf::17) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email 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definitions=main-2606220099 Hi Honza, On 6/18/26 02:42, Jan Kara wrote: > > Allocating ext4_ea_iput_entry for dropping each inode is somewhat wasteful. > I want to suggest another scheme (somewhat more involved but more efficient > scheme): > > 1) Create a VFS helper bool iput_if_not_last(struct inode *inode) which > drops inode reference if it is not the last one (and returns true in that > case). Basically: > > bool iput_if_not_last(struct inode *inode) > { > return atomic_add_unless(&inode->i_count, -1, 1); > } > > This needs to be a separate patch as it should get vetting from VFS > maintainers. After taking a closer look, it seems that this function doesn't need to be added to the VFS layer — at least not for now. For example, we could directly inline atomic_add_unless() into ext4_put_ea_inode(): void ext4_put_ea_inode(struct super_block *sb, struct inode *inode) { if (!inode) return; if (atomic_add_unless(&inode->i_count, -1, 1)) return; llist_add(&EXT4_I(inode)->i_ea_iput_node, &EXT4_SB(sb)->s_ea_inode_to_free); schedule_delayed_work(&EXT4_SB(sb)->s_ea_inode_work, 1); } This way, we avoid submitting an isolated patch to the VFS layer that currently has only one user (ext4). If there is indeed a real need for it in the future, we can always submit a follow-up patch to refactor it. What do you think? BR, Yun