在 2020年10月02日 00:00, crash-utility-request@xxxxxxxxxx 写道:
> Message: 2
> Date: Thu, 1 Oct 2020 15:19:59 +0200
> From: Alexander Egorenkov <egorenar@xxxxxxxxxxxxx>
> To: crash-utility@xxxxxxxxxx, k-hagio-ab@xxxxxxx
> Subject: [PATCH v2 1/1] Support member offset
> uts_namespace.name
> Message-ID: <20201001131959.456735-1-egorenar@xxxxxxxxxxxxx>
> Content-Type: text/plain; charset="US-ASCII"
>
> The offset of the field 'init_uts_ns.name' has changed
> since commit 9a56493f6942 ("uts: Use generic ns_common::count").
>
> Link: https://lore.kernel.org/r/159644978167.604812.1773586504374412107.stgit@localhost.localdomain
>
> Read the offset from VMCOREINFO if present. This requires a linux version
> which exports the requisite offset in VMCOREINFO.
>
> Signed-off-by: Alexander Egorenkov <egorenar@xxxxxxxxxxxxx>
> ---
>
> v1 -> v2:
> * Use offset from VMCOREINFO
> * Initialize corresponding entry in offset_table
> For the v2:
Acked-by: Lianbo Jiang <lijiang@xxxxxxxxxx>
Thanks.
> defs.h | 1 +
> kernel.c | 15 ++++++++++-----
> symbols.c | 3 +++
> 3 files changed, 14 insertions(+), 5 deletions(-)
>
> diff --git a/defs.h b/defs.h
> index c899fe2..9a8030a 100644
> --- a/defs.h
> +++ b/defs.h
> @@ -2104,6 +2104,7 @@ struct offset_table { /* stash of commonly-used offsets */
> long inode_i_sb_list;
> long irq_common_data_affinity;
> long irq_desc_irq_common_data;
> + long uts_namespace_name;
> };
>
> struct size_table { /* stash of commonly-used sizes */
> diff --git a/kernel.c b/kernel.c
> index 5ae8cf1..9871637 100644
> --- a/kernel.c
> +++ b/kernel.c
> @@ -230,16 +230,21 @@ kernel_init()
> fprintf(fp, "%s\n\n", ctime_tz(&kt->date.tv_sec));
> clean_exit(0);
> }
> -
> +
> + MEMBER_OFFSET_INIT(uts_namespace_name, "uts_namespace", "name");
> if (symbol_exists("system_utsname"))
> readmem(symbol_value("system_utsname"), KVADDR, &kt->utsname,
> sizeof(struct new_utsname), "system_utsname",
> RETURN_ON_ERROR);
> - else if (symbol_exists("init_uts_ns"))
> - readmem(symbol_value("init_uts_ns") + sizeof(int),
> - KVADDR, &kt->utsname, sizeof(struct new_utsname),
> + else if (symbol_exists("init_uts_ns")) {
> + long offset = sizeof(int);
> + if (VALID_MEMBER(uts_namespace_name))
> + offset = OFFSET(uts_namespace_name);
> +
> + readmem(symbol_value("init_uts_ns") + offset,
> + KVADDR, &kt->utsname, sizeof(struct new_utsname),
> "init_uts_ns", RETURN_ON_ERROR);
> - else
> + } else
> error(INFO, "cannot access utsname information\n\n");
>
> if (CRASHDEBUG(1)) {
> diff --git a/symbols.c b/symbols.c
> index d22fb1d..3dd5fa1 100644
> --- a/symbols.c
> +++ b/symbols.c
> @@ -10585,6 +10585,9 @@ dump_offset_table(char *spec, ulong makestruct)
> fprintf(fp, " xa_node_shift: %ld\n",
> OFFSET(xa_node_shift));
>
> + fprintf(fp, " uts_namespace_name: %ld\n",
> + OFFSET(uts_namespace_name));
> +
> fprintf(fp, "\n size_table:\n");
> fprintf(fp, " page: %ld\n", SIZE(page));
> fprintf(fp, " page_flags: %ld\n", SIZE(page_flags));
> -- 2.26.2
--
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