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powerpc/pseries: Read and write to the 'compressed' flag of pstore

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If data returned from pstore is compressed, nvram's write callback
will add a flag ERR_TYPE_KERNEL_PANIC_GZ indicating the data is compressed
while writing to nvram. If the data read from nvram is compressed, nvram's
read callback will set the flag 'compressed'. The patch adds backward
compatibilty with old format oops header when reading from pstore.

Signed-off-by: Aruna Balakrishnaiah <aruna@linux.vnet.ibm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Aruna Balakrishnaiah 2013-08-16 13:53:49 -07:00 committed by Tony Luck
parent 9ad2cbe0a9
commit 40594264bd
1 changed files with 8 additions and 0 deletions
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8
arch/powerpc/platforms/pseries/nvram.c
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@ -581,6 +581,9 @@ static int nvram_pstore_write(enum pstore_type_id type,
oops_hdr->report_length = (u16) size;
oops_hdr->timestamp = get_seconds();
if (compressed)
err_type = ERR_TYPE_KERNEL_PANIC_GZ;
rc = nvram_write_os_partition(&oops_log_partition, oops_buf,
(int) (sizeof(*oops_hdr) + size), err_type, count);
@ -687,6 +690,11 @@ static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,
return -ENOMEM;
memcpy(*buf, buff + hdr_size, length);
kfree(buff);
if (err_type == ERR_TYPE_KERNEL_PANIC_GZ)
*compressed = true;
else
*compressed = false;
return length;
}