linux-kernel - Re: [PATCH v2] erofs: fix refcount on the metabuf used for inode lookup

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Message-ID: <85099656-4d7c-4992-a149-0942ebbea1d1@linux.alibaba.com>
Date: Thu, 22 Feb 2024 08:42:46 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Sandeep Dhavale <dhavale@...gle.com>, Gao Xiang <xiang@...nel.org>,
 Chao Yu <chao@...nel.org>, Yue Hu <huyue2@...lpad.com>,
 Jeffle Xu <jefflexu@...ux.alibaba.com>
Cc: quic_wenjieli@...cinc.com, stable@...r.kernel.org,
 kernel-team@...roid.com, linux-erofs@...ts.ozlabs.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] erofs: fix refcount on the metabuf used for inode
 lookup



On 2024/2/22 05:03, Sandeep Dhavale wrote:
> In erofs_find_target_block() when erofs_dirnamecmp() returns 0,
> we do not assign the target metabuf. This causes the caller
> erofs_namei()'s erofs_put_metabuf() at the end to be not effective
> leaving the refcount on the page.
> As the page from metabuf (buf->page) is never put, such page cannot be
> migrated or reclaimed. Fix it now by putting the metabuf from
> previous loop and assigning the current metabuf to target before
> returning so caller erofs_namei() can do the final put as it was
> intended.
> 
> Fixes: 500edd095648 ("erofs: use meta buffers for inode lookup")
> Cc: stable@...r.kernel.org
> Signed-off-by: Sandeep Dhavale <dhavale@...gle.com>

Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>

Thanks,
Gao Xiang