linux-kernel - Re: [PATCH] pstore: avoid incorrectly mark entry as duplicate

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Message-ID: <CAFLxGvxT1S3km=LordqFGbAb_pWc0cf3oE2ciS9uY4BBJJ231A@mail.gmail.com>
Date:	Wed, 23 Oct 2013 17:58:33 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Madper Xie <cxie@...hat.com>
Cc:	"Luck, Tony" <tony.luck@...el.com>,
	Anton Vorontsov <anton@...msg.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Seiji Aguchi <seiji.aguchi@....com>,
	Lenny Szubowicz <lszubowi@...hat.com>,
	成骏 谢 <bbboson@...il.com>
Subject: Re: [PATCH] pstore: avoid incorrectly mark entry as duplicate

On Wed, Oct 23, 2013 at 4:55 PM, Madper Xie <cxie@...hat.com> wrote:
> pstore try to find duplicate entries by check both ID, type and psi.
> They are not really enough for efi backend. dumped vars always have
> the same type, psi and ID. like follows:
> dump-type0-9-1-1382511508-C-cfc8fc79-be2e-4ddc-97f0-9f98bfe298a0
> dump-type0-9-1-1382515661-C-cfc8fc79-be2e-4ddc-97f0-9f98bfe298a0
>
> The "duplicate" entries won't appear in pstorefs. And a complain will be
> print -- pstore: failed to load 76 record(s) from 'efi'
> So I add one more check: timespec.
>
> Signed-off-by: Madper Xie <cxie@...hat.com>
> ---
>  fs/pstore/inode.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
> index 1282384..f70f1e5 100644
> --- a/fs/pstore/inode.c
> +++ b/fs/pstore/inode.c
> @@ -47,6 +47,7 @@ static LIST_HEAD(allpstore);
>  struct pstore_private {
>         struct list_head list;
>         struct pstore_info *psi;
> +       struct timespec time;
>         enum pstore_type_id type;
>         u64     id;
>         int     count;
> @@ -290,7 +291,8 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
>         list_for_each_entry(pos, &allpstore, list) {
>                 if (pos->type == type &&
>                     pos->id == id &&
> -                   pos->psi == psi) {
> +                   pos->psi == psi &&
> +                   !timespec_compare(&pos->time, &time)) {
>                         rc = -EEXIST;
>                         break;
>                 }
> @@ -312,6 +314,7 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
>         private->id = id;
>         private->count = count;
>         private->psi = psi;
> +       memcpy(&private->time, &time, sizeof(struct timespec));
>
>         switch (type) {
>         case PSTORE_TYPE_DMESG:


As discussed on IRC, why don't you compare the variable names?

-- 
Thanks,
//richard
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