[Ocfs2-devel] [PATCH] ocfs2: fix ocfs2 read inode data panic in ocfs2_iget

[Joseph Qi <jiangqi903@gmail.com>]

On 19/3/25 09:26, Shuning Zhang wrote:
> In some cases, the function ocfs2_iget read the data of inode, which has
> been deleted for some reason. That will make the system panic. So We
> should judge whether this inode has been deleted, and tell the caller
> that the inode is a bad inode.
> 
> [283465.542049] OCFS2: ERROR (device sdp): ocfs2_validate_inode_block:
> Invalid dinode #580640: OCFS2_VALID_FL not set
> 

Looks like it is a filesystem corruption bug.
So we'd better find where it is introduced and try to fix it there.

Thanks,
Joseph

> [283465.545490] Kernel panic - not syncing: OCFS2: (device sdp): panic forced
> after error
> 
> [283465.546889] CPU: 5 PID: 12416 Comm: nfsd Tainted: G        W
> 4.1.12-124.18.6.el6uek.bug28762940v3.x86_64 #2
> [283465.548382] Hardware name: VMware, Inc. VMware Virtual Platform/440BX
> Desktop Reference Platform, BIOS 6.00 09/21/2015
> [283465.549657]  0000000000000000 ffff8800a56fb7b8 ffffffff816e839c
> ffffffffa0514758
> [283465.550392]  000000000008dc20 ffff8800a56fb838 ffffffff816e62d3
> 0000000000000008
> [283465.551056]  ffff880000000010 ffff8800a56fb848 ffff8800a56fb7e8
> ffff88005df9f000
> [283465.551710] Call Trace:
> [283465.552516]  [<ffffffff816e839c>] dump_stack+0x63/0x81
> [283465.553291]  [<ffffffff816e62d3>] panic+0xcb/0x21b
> [283465.554037]  [<ffffffffa04e66b0>] ocfs2_handle_error+0xf0/0xf0 [ocfs2]
> [283465.554882]  [<ffffffffa04e7737>] __ocfs2_error+0x67/0x70 [ocfs2]
> [283465.555768]  [<ffffffffa049c0f9>] ocfs2_validate_inode_block+0x229/0x230
> [ocfs2]
> [283465.556683]  [<ffffffffa047bcbc>] ocfs2_read_blocks+0x46c/0x7b0 [ocfs2]
> [283465.557408]  [<ffffffffa049bed0>] ? ocfs2_inode_cache_io_unlock+0x20/0x20
> [ocfs2]
> [283465.557973]  [<ffffffffa049f0eb>] ocfs2_read_inode_block_full+0x3b/0x60
> [ocfs2]
> [283465.558525]  [<ffffffffa049f5ba>] ocfs2_iget+0x4aa/0x880 [ocfs2]
> [283465.559082]  [<ffffffffa049146e>] ocfs2_get_parent+0x9e/0x220 [ocfs2]
> [283465.559622]  [<ffffffff81297c05>] reconnect_path+0xb5/0x300
> [283465.560156]  [<ffffffff81297f46>] exportfs_decode_fh+0xf6/0x2b0
> [283465.560708]  [<ffffffffa062faf0>] ? nfsd_proc_getattr+0xa0/0xa0 [nfsd]
> [283465.561262]  [<ffffffff810a8196>] ? prepare_creds+0x26/0x110
> [283465.561932]  [<ffffffffa0630860>] fh_verify+0x350/0x660 [nfsd]
> [283465.562862]  [<ffffffffa0637804>] ? nfsd_cache_lookup+0x44/0x630 [nfsd]
> [283465.563697]  [<ffffffffa063a8b9>] nfsd3_proc_getattr+0x69/0xf0 [nfsd]
> [283465.564510]  [<ffffffffa062cf60>] nfsd_dispatch+0xe0/0x290 [nfsd]
> [283465.565358]  [<ffffffffa05eb892>] ? svc_tcp_adjust_wspace+0x12/0x30
> [sunrpc]
> [283465.566272]  [<ffffffffa05ea652>] svc_process_common+0x412/0x6a0 [sunrpc]
> [283465.567155]  [<ffffffffa05eaa03>] svc_process+0x123/0x210 [sunrpc]
> [283465.568020]  [<ffffffffa062c90f>] nfsd+0xff/0x170 [nfsd]
> [283465.568962]  [<ffffffffa062c810>] ? nfsd_destroy+0x80/0x80 [nfsd]
> [283465.570112]  [<ffffffff810a622b>] kthread+0xcb/0xf0
> [283465.571099]  [<ffffffff810a6160>] ? kthread_create_on_node+0x180/0x180
> [283465.572114]  [<ffffffff816f11b8>] ret_from_fork+0x58/0x90
> [283465.573156]  [<ffffffff810a6160>] ? kthread_create_on_node+0x180/0x180
> ---
>  fs/ocfs2/inode.c |   22 ++++++++++++++++++++++
>  1 files changed, 22 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
> index b254416..a7f8160 100644
> --- a/fs/ocfs2/inode.c
> +++ b/fs/ocfs2/inode.c
> @@ -513,6 +513,16 @@ static int ocfs2_read_locked_inode(struct inode *inode,
>  	status = -EINVAL;
>  	fe = (struct ocfs2_dinode *) bh->b_data;
>  
> +	/* 
> +	 * In some cases, this inode has been deleted, but the data of 
> +	 * inode is read directly. So We should judge whether this inode 
> +	 * has been deleted.
> +	 * */
> +	if (unlikely(fe->i_dtime != 0)) {
> +		mlog(ML_NOTICE, "The inode %llu has been deleted\n",
> +		     le64_to_cpu(fe->i_blkno));
> +	        goto bail;
> +	}
>  	/*
>  	 * This is a code bug. Right now the caller needs to
>  	 * understand whether it is asking for a system file inode or
> @@ -1331,6 +1341,18 @@ int ocfs2_validate_inode_block(struct super_block *sb,
>  
>  	BUG_ON(!buffer_uptodate(bh));
>  
> +	/* 
> +	 * In some cases, this inode has been deleted, but the data of 
> +	 * inode is read directly. This is not a data corruption.So 
> +	 * We should judge whether this inode has been deleted.
> +	 * */
> +	if (unlikely(di->i_dtime != 0)) {
> +		rc = -EINVAL;
> +		mlog(ML_NOTICE, "The inode %llu has been deleted\n",
> +		     le64_to_cpu(di->i_blkno));
> +	        goto bail;
> +	}
> +
>  	/*
>  	 * If the ecc fails, we return the error but otherwise
>  	 * leave the filesystem running.  We know any error is
>