richard.weinberger@xxxxxxxxx writes:
> On Wed, Oct 23, 2013 at 4:55 PM, Madper Xie <cxie@xxxxxxxxxx> 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@xxxxxxxxxx>
>> ---
>> 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?
Howdy Richard,
Let's analyze the name of "duplicate" entries:
>> dump-type0-9-1-1382511508-C-cfc8fc79-be2e-4ddc-97f0-9f98bfe298a0
>> dump-type0-9-1-1382515661-C-cfc8fc79-be2e-4ddc-97f0-9f98bfe298a0
The have the same name except timestamp. In this case, there is no
difference between compare names and compare timestamps.
( Yeah, I'm pretty sure the guid will be the same one --
LINUX_EFI_CRASH_GUID )
But efi is only one backend. For other backends, we don't sure if they
will add timestamp to name. So...
--
Best,
Madper Xie.
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