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From:   Andrew W Elble <aweits@rit.edu>
To:     Benjamin Coddington <bcodding@redhat.com>
Cc:     "J. Bruce Fields" <bfields@redhat.com>,
        <linux-nfs@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>,
        <abe@purdue.edu>, <lsof-l@lists.purdue.edu>,
        <util-linux@vger.kernel.org>, <jlayton@redhat.com>
Subject: Re: [PATCH 09/10] nfsd: expose some more information about NFSv4 opens
References: <1556201060-7947-1-git-send-email-bfields@redhat.com>
        <1556201060-7947-10-git-send-email-bfields@redhat.com>
        <786E0C83-A22D-461A-A9D1-AF7B42018CE9@redhat.com>
Date:   Thu, 02 May 2019 11:58:06 -0400
In-Reply-To: <786E0C83-A22D-461A-A9D1-AF7B42018CE9@redhat.com> (Benjamin
        Coddington's message of "Thu, 2 May 2019 11:28:31 -0400")
Message-ID: <m2k1f8hmr5.fsf@discipline.rit.edu>
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Benjamin Coddington <bcodding@redhat.com> writes:

> On 25 Apr 2019, at 10:04, J. Bruce Fields wrote:
>
>> From: "J. Bruce Fields" <bfields@redhat.com>
>>
>> Add open modes, device numbers, inode numbers, and open owners to each
>> line of nfsd/clients/#/opens.
>>
>> Open owners are totally opaque but seem to sometimes have some useful
>> ascii strings included, so passing through printable ascii characters
>> and escaping the rest seems useful while still being machine-readable.
>> ---
>>  fs/nfsd/nfs4state.c            | 40
>> ++++++++++++++++++++++++++++------
>>  fs/nfsd/state.h                |  2 +-
>>  fs/seq_file.c                  | 17 +++++++++++++++
>>  include/linux/seq_file.h       |  2 ++
>>  include/linux/string_helpers.h |  1 +
>>  lib/string_helpers.c           |  5 +++--
>>  6 files changed, 57 insertions(+), 10 deletions(-)
>>
>> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
>> index 829d1e5440d3..f53621a65e60 100644
>> --- a/fs/nfsd/nfs4state.c
>> +++ b/fs/nfsd/nfs4state.c
>> @@ -42,6 +42,7 @@
>>  #include <linux/sunrpc/svcauth_gss.h>
>>  #include <linux/sunrpc/addr.h>
>>  #include <linux/jhash.h>
>> +#include <linux/string_helpers.h>
>>  #include "xdr4.h"
>>  #include "xdr4cb.h"
>>  #include "vfs.h"
>> @@ -2261,16 +2262,41 @@ static void opens_stop(struct seq_file *s,
>> void *v)
>>  static int opens_show(struct seq_file *s, void *v)
>>  {
>>  	struct nfs4_stid *st = v;
>> -	struct nfs4_ol_stateid *os;
>> -	u64 stateid;
>> +	struct nfs4_ol_stateid *ols;
>> +	struct nfs4_file *nf;
>> +	struct file *file;
>> +	struct inode *inode;
>> +	struct nfs4_stateowner *oo;
>> +	unsigned int access, deny;
>>
>>  	if (st->sc_type != NFS4_OPEN_STID)
>>  		return 0; /* XXX: or SEQ_SKIP? */
>> -	os = openlockstateid(st);
>> -	/* XXX: get info about file, etc., here */
>> +	ols = openlockstateid(st);
>> +	oo = ols->st_stateowner;
>> +	nf = st->sc_file;
>> +	file = find_any_file(nf);

Is there a matching fput() missing somewhere, or did I just not see it...?

>> +	inode = d_inode(file->f_path.dentry);
>> +
>> +	seq_printf(s, STATEID_FMT, STATEID_VAL(&st->sc_stateid));
>
> Should we match the byte order printed with what wireshark/tshark sees?

^^ +1


Thanks,

Andy

-- 
Andrew W. Elble
Infrastructure Engineer
Information and Technology Services
Rochester Institute of Technology
tel: (585)-475-2411 | aweits@rit.edu
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