linux-kernel - Re: [PATCH -next v3 2/2] erofs: reliably distinguish block based and fscache mode

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Message-ID: <bc0119e6-3f21-4fc2-9deb-51bc2ca8749f@linux.alibaba.com>
Date: Sun, 28 Apr 2024 15:17:33 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Baokun Li <libaokun1@...wei.com>, linux-erofs@...ts.ozlabs.org
Cc: xiang@...nel.org, chao@...nel.org, huyue2@...lpad.com,
 jefflexu@...ux.alibaba.com, viro@...iv.linux.org.uk, brauner@...nel.org,
 linux-kernel@...r.kernel.org, yangerkun@...wei.com, houtao1@...wei.com
Subject: Re: [PATCH -next v3 2/2] erofs: reliably distinguish block based and
 fscache mode



On 2024/4/19 20:36, Baokun Li wrote:
> From: Christian Brauner <brauner@...nel.org>
> 
> When erofs_kill_sb() is called in block dev based mode, s_bdev may not
> have been initialised yet, and if CONFIG_EROFS_FS_ONDEMAND is enabled,
> it will be mistaken for fscache mode, and then attempt to free an anon_dev
> that has never been allocated, triggering the following warning:
> 
> ============================================
> ida_free called for id=0 which is not allocated.
> WARNING: CPU: 14 PID: 926 at lib/idr.c:525 ida_free+0x134/0x140
> Modules linked in:
> CPU: 14 PID: 926 Comm: mount Not tainted 6.9.0-rc3-dirty #630
> RIP: 0010:ida_free+0x134/0x140
> Call Trace:
>   <TASK>
>   erofs_kill_sb+0x81/0x90
>   deactivate_locked_super+0x35/0x80
>   get_tree_bdev+0x136/0x1e0
>   vfs_get_tree+0x2c/0xf0
>   do_new_mount+0x190/0x2f0
>   [...]
> ============================================
> 
> Now when erofs_kill_sb() is called, erofs_sb_info must have been
> initialised, so use sbi->fsid to distinguish between the two modes.
> 
> Signed-off-by: Christian Brauner <brauner@...nel.org>
> Signed-off-by: Baokun Li <libaokun1@...wei.com>

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

Thanks,
Gao Xiang