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SubjectRe: [PATCH -next v3 2/2] erofs: reliably distinguish block based and fscache mode
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On 4/19/24 8:36 PM, Baokun Li wrote:
> From: Christian Brauner <brauner@kernel.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@kernel.org>
> Signed-off-by: Baokun Li <libaokun1@huawei.com>

Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com>


> ---
> fs/erofs/super.c | 8 ++------
> 1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/fs/erofs/super.c b/fs/erofs/super.c
> index 21faa49bc970..30b49b2eee53 100644
> --- a/fs/erofs/super.c
> +++ b/fs/erofs/super.c
> @@ -789,17 +789,13 @@ static int erofs_init_fs_context(struct fs_context *fc)
>
> static void erofs_kill_sb(struct super_block *sb)
> {
> - struct erofs_sb_info *sbi;
> + struct erofs_sb_info *sbi = EROFS_SB(sb);
>
> - if (erofs_is_fscache_mode(sb))
> + if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && sbi->fsid)
> kill_anon_super(sb);
> else
> kill_block_super(sb);
>
> - sbi = EROFS_SB(sb);
> - if (!sbi)
> - return;
> -
> erofs_free_dev_context(sbi->devs);
> fs_put_dax(sbi->dax_dev, NULL);
> erofs_fscache_unregister_fs(sb);

--
Thanks,
Jingbo

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