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

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Message-ID: <87r4bcdok1.fsf@redhat.com>
Date:	Wed, 23 Oct 2013 22:55:42 +0800
From:	Madper Xie <cxie@...hat.com>
To:	"Luck\, Tony" <tony.luck@...el.com>,
	Anton Vorontsov <anton@...msg.org>,
	"linux-efi\@vger.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Seiji Aguchi <seiji.aguchi@....com>,
	Lenny Szubowicz <lszubowi@...hat.com>
Cc:	成骏 谢 <bbboson@...il.com>
Subject: [PATCH] pstore: avoid incorrectly mark entry as duplicate

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:
-- 
1.8.4.1
--
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