Re: [PATCH] nfsd: map the EBADMSG to nfserr_io to avoid warning

[Jeff Layton]

On Sat, 2024-08-17 at 14:27 +0800, Li Lingfeng wrote:
> From: Li Lingfeng <lilingfeng3@xxxxxxxxxx>
> 
> Ext4 will throw -EBADMSG through ext4_readdir when a checksum error
> occurs, resulting in the following WARNING.
> 
> Fix it by mapping EBADMSG to nfserr_io.
> 
> nfsd_buffered_readdir
>  iterate_dir // -EBADMSG -74
>   ext4_readdir // .iterate_shared
>    ext4_dx_readdir
>     ext4_htree_fill_tree
>      htree_dirblock_to_tree
>       ext4_read_dirblock
>        __ext4_read_dirblock
>         ext4_dirblock_csum_verify
>          warn_no_space_for_csum
>           __warn_no_space_for_csum
>         return ERR_PTR(-EFSBADCRC) // -EBADMSG -74
>  nfserrno // WARNING
> 
> [  161.115610] ------------[ cut here ]------------
> [  161.116465] nfsd: non-standard errno: -74
> [  161.117315] WARNING: CPU: 1 PID: 780 at fs/nfsd/nfsproc.c:878 nfserrno+0x9d/0xd0
> [  161.118596] Modules linked in:
> [  161.119243] CPU: 1 PID: 780 Comm: nfsd Not tainted 5.10.0-00014-g79679361fd5d #138
> [  161.120684] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qe
> mu.org 04/01/2014
> [  161.123601] RIP: 0010:nfserrno+0x9d/0xd0
> [  161.124676] Code: 0f 87 da 30 dd 00 83 e3 01 b8 00 00 00 05 75 d7 44 89 ee 48 c7 c7 c0 57 24 98 89 44 24 04 c6
>  05 ce 2b 61 03 01 e8 99 20 d8 00 <0f> 0b 8b 44 24 04 eb b5 4c 89 e6 48 c7 c7 a0 6d a4 99 e8 cc 15 33
> [  161.127797] RSP: 0018:ffffc90000e2f9c0 EFLAGS: 00010286
> [  161.128794] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> [  161.130089] RDX: 1ffff1103ee16f6d RSI: 0000000000000008 RDI: fffff520001c5f2a
> [  161.131379] RBP: 0000000000000022 R08: 0000000000000001 R09: ffff8881f70c1827
> [  161.132664] R10: ffffed103ee18304 R11: 0000000000000001 R12: 0000000000000021
> [  161.133949] R13: 00000000ffffffb6 R14: ffff8881317c0000 R15: ffffc90000e2fbd8
> [  161.135244] FS:  0000000000000000(0000) GS:ffff8881f7080000(0000) knlGS:0000000000000000
> [  161.136695] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  161.137761] CR2: 00007fcaad70b348 CR3: 0000000144256006 CR4: 0000000000770ee0
> [  161.139041] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [  161.140291] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [  161.141519] PKRU: 55555554
> [  161.142076] Call Trace:
> [  161.142575]  ? __warn+0x9b/0x140
> [  161.143229]  ? nfserrno+0x9d/0xd0
> [  161.143872]  ? report_bug+0x125/0x150
> [  161.144595]  ? handle_bug+0x41/0x90
> [  161.145284]  ? exc_invalid_op+0x14/0x70
> [  161.146009]  ? asm_exc_invalid_op+0x12/0x20
> [  161.146816]  ? nfserrno+0x9d/0xd0
> [  161.147487]  nfsd_buffered_readdir+0x28b/0x2b0
> [  161.148333]  ? nfsd4_encode_dirent_fattr+0x380/0x380
> [  161.149258]  ? nfsd_buffered_filldir+0xf0/0xf0
> [  161.150093]  ? wait_for_concurrent_writes+0x170/0x170
> [  161.151004]  ? generic_file_llseek_size+0x48/0x160
> [  161.151895]  nfsd_readdir+0x132/0x190
> [  161.152606]  ? nfsd4_encode_dirent_fattr+0x380/0x380
> [  161.153516]  ? nfsd_unlink+0x380/0x380
> [  161.154256]  ? override_creds+0x45/0x60
> [  161.155006]  nfsd4_encode_readdir+0x21a/0x3d0
> [  161.155850]  ? nfsd4_encode_readlink+0x210/0x210
> [  161.156731]  ? write_bytes_to_xdr_buf+0x97/0xe0
> [  161.157598]  ? __write_bytes_to_xdr_buf+0xd0/0xd0
> [  161.158494]  ? lock_downgrade+0x90/0x90
> [  161.159232]  ? nfs4svc_decode_voidarg+0x10/0x10
> [  161.160092]  nfsd4_encode_operation+0x15a/0x440
> [  161.160959]  nfsd4_proc_compound+0x718/0xe90
> [  161.161818]  nfsd_dispatch+0x18e/0x2c0
> [  161.162586]  svc_process_common+0x786/0xc50
> [  161.163403]  ? nfsd_svc+0x380/0x380
> [  161.164137]  ? svc_printk+0x160/0x160
> [  161.164846]  ? svc_xprt_do_enqueue.part.0+0x365/0x380
> [  161.165808]  ? nfsd_svc+0x380/0x380
> [  161.166523]  ? rcu_is_watching+0x23/0x40
> [  161.167309]  svc_process+0x1a5/0x200
> [  161.168019]  nfsd+0x1f5/0x380
> [  161.168663]  ? nfsd_shutdown_threads+0x260/0x260
> [  161.169554]  kthread+0x1c4/0x210
> [  161.170224]  ? kthread_insert_work_sanity_check+0x80/0x80
> [  161.171246]  ret_from_fork+0x1f/0x30
> 
> Signed-off-by: Li Lingfeng <lilingfeng3@xxxxxxxxxx>
> ---
>  fs/nfsd/vfs.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
> index 29b1f3613800..911e5e0a17af 100644
> --- a/fs/nfsd/vfs.c
> +++ b/fs/nfsd/vfs.c
> @@ -100,6 +100,7 @@ nfserrno (int errno)
>  		{ nfserr_io, -EUCLEAN },
>  		{ nfserr_perm, -ENOKEY },
>  		{ nfserr_no_grace, -ENOGRACE},
> +		{ nfserr_io, -EBADMSG },
>  	};
>  	int	i;
>  

Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>