From: Chuck Lever III <chuck.lever@oracle.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
David Wysochanski <dwysocha@redhat.com>,
Bruce Fields <bfields@fieldses.org>
Subject: Re: [PATCH v2 01/25] NFSD: Fix TP_printk() format specifier in trace_nfsd_dirent()
Date: Wed, 12 May 2021 16:52:05 +0000 [thread overview]
Message-ID: <238C0E2D-C2A4-4578-ADD2-C565B3B99842@oracle.com> (raw)
In-Reply-To: <20210512122623.79ee0dda@gandalf.local.home>
Hi Steve-
> On May 12, 2021, at 12:26 PM, Steven Rostedt <rostedt@goodmis.org> wrote:
>
> On Wed, 12 May 2021 11:35:02 -0400
> Chuck Lever <chuck.lever@oracle.com> wrote:
>
>> Since commit 9a6944fee68e ("tracing: Add a verifier to check string
>> pointers for trace events"), which was merged in v5.13-rc1,
>> TP_printk() no longer tacitly supports the "%.*s" format specifier.
>
> Hmm, this looks like a bug. I should allow the %.*s notation.
>
> I probably should fix that.
The underlying need is to support non-NUL-terminated C strings.
I assumed that since the commentary around 9a6944fee68e claims
the proper way to trace C strings is to use __string and friends,
and those do not support non-NUL-terminated strings, that such
strings are really not first-class citizens. Thus I concluded
that my use of '%.*s' was incorrect.
Having some __string-style helpers that can deal with such
strings would be valuable.
--
Chuck Lever
next prev parent reply other threads:[~2021-05-12 17:41 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-12 15:34 [PATCH v2 00/25] NFSD callback and lease management observability Chuck Lever
2021-05-12 15:35 ` [PATCH v2 01/25] NFSD: Fix TP_printk() format specifier in trace_nfsd_dirent() Chuck Lever
2021-05-12 16:26 ` Steven Rostedt
2021-05-12 16:52 ` Chuck Lever III [this message]
2021-05-13 14:50 ` Steven Rostedt
2021-05-13 14:53 ` Chuck Lever III
2021-05-13 15:02 ` Steven Rostedt
2021-05-13 15:10 ` Chuck Lever III
2021-05-13 18:43 ` Chuck Lever III
2021-05-13 19:00 ` Steven Rostedt
2021-05-13 19:08 ` Chuck Lever III
2021-05-13 19:17 ` Steven Rostedt
2021-05-13 20:01 ` Chuck Lever III
2021-07-12 15:18 ` Chuck Lever III
2021-07-12 17:09 ` Steven Rostedt
2021-05-12 16:53 ` Steven Rostedt
2021-05-12 15:35 ` [PATCH v2 02/25] NFSD: Fix TP_printk() format specifier in nfsd_clid_class Chuck Lever
2021-05-12 15:35 ` [PATCH v2 03/25] NFSD: Add nfsd_clid_cred_mismatch tracepoint Chuck Lever
2021-05-12 15:35 ` [PATCH v2 04/25] NFSD: Add nfsd_clid_verf_mismatch tracepoint Chuck Lever
2021-05-12 15:35 ` [PATCH v2 05/25] NFSD: Remove trace_nfsd_clid_inuse_err Chuck Lever
2021-05-12 15:35 ` [PATCH v2 06/25] NFSD: Add nfsd_clid_confirmed tracepoint Chuck Lever
2021-05-12 15:35 ` [PATCH v2 07/25] NFSD: Add nfsd_clid_reclaim_complete tracepoint Chuck Lever
2021-05-12 15:35 ` [PATCH v2 08/25] NFSD: Add nfsd_clid_destroyed tracepoint Chuck Lever
2021-05-12 15:35 ` [PATCH v2 09/25] NFSD: Add a couple more nfsd_clid_expired call sites Chuck Lever
2021-05-13 16:42 ` David Wysochanski
2021-05-13 17:05 ` Chuck Lever III
2021-05-12 15:36 ` [PATCH v2 10/25] NFSD: Add an RPC authflavor tracepoint display helper Chuck Lever
2021-05-12 15:36 ` [PATCH v2 11/25] NFSD: Add tracepoints for SETCLIENTID edge cases Chuck Lever
2021-05-12 15:36 ` [PATCH v2 12/25] NFSD: Add tracepoints for EXCHANGEID " Chuck Lever
2021-05-12 15:36 ` [PATCH v2 13/25] NFSD: Constify @fh argument of knfsd_fh_hash() Chuck Lever
2021-05-12 15:36 ` [PATCH v2 14/25] NFSD: Capture every CB state transition Chuck Lever
2021-05-12 15:36 ` [PATCH v2 15/25] NFSD: Drop TRACE_DEFINE_ENUM for NFSD4_CB_<state> macros Chuck Lever
2021-05-12 15:36 ` [PATCH v2 16/25] NFSD: Add cb_lost tracepoint Chuck Lever
2021-05-12 15:36 ` [PATCH v2 17/25] NFSD: Adjust cb_shutdown tracepoint Chuck Lever
2021-05-12 15:36 ` [PATCH v2 18/25] NFSD: Remove spurious cb_setup_err tracepoint Chuck Lever
2021-05-12 15:37 ` [PATCH v2 19/25] NFSD: Enhance the nfsd_cb_setup tracepoint Chuck Lever
2021-05-12 15:37 ` [PATCH v2 20/25] NFSD: Add an nfsd_cb_lm_notify tracepoint Chuck Lever
2021-05-12 15:37 ` [PATCH v2 21/25] NFSD: Add an nfsd_cb_offload tracepoint Chuck Lever
2021-05-12 15:37 ` [PATCH v2 22/25] NFSD: Replace the nfsd_deleg_break tracepoint Chuck Lever
2021-05-12 15:37 ` [PATCH v2 23/25] NFSD: Add an nfsd_cb_probe tracepoint Chuck Lever
2021-05-12 15:37 ` [PATCH v2 24/25] NFSD: Remove the nfsd_cb_work and nfsd_cb_done tracepoints Chuck Lever
2021-05-12 15:37 ` [PATCH v2 25/25] NFSD: Update nfsd_cb_args tracepoint Chuck Lever
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