Re: [PATCH AUTOSEL 6.6 21/43] erofs: reliably distinguish block based and fscache mode

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Hi,

On 2024/5/8 07:09, Sasha Levin wrote:
From: Christian Brauner <brauner@xxxxxxxxxx>

[ Upstream commit 7af2ae1b1531feab5d38ec9c8f472dc6cceb4606 ]

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@xxxxxxxxxx>
Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
Reviewed-by: Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx>
Reviewed-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240419123611.947084-3-libaokun1@xxxxxxxxxx
Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

Please help drop this patch, you should backport the dependency
commit 07abe43a28b2 ("erofs: get rid of erofs_fs_context")

in advance.

Thanks,
Gao Xiang




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