powerpc/pseries: Read and write to the 'compressed' flag of pstore
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>
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@ -581,6 +581,9 @@ static int nvram_pstore_write(enum pstore_type_id type,
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oops_hdr->report_length = (u16) size;
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oops_hdr->timestamp = get_seconds();
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if (compressed)
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err_type = ERR_TYPE_KERNEL_PANIC_GZ;
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rc = nvram_write_os_partition(&oops_log_partition, oops_buf,
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(int) (sizeof(*oops_hdr) + size), err_type, count);
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@ -687,6 +690,11 @@ static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,
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return -ENOMEM;
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memcpy(*buf, buff + hdr_size, length);
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kfree(buff);
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if (err_type == ERR_TYPE_KERNEL_PANIC_GZ)
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*compressed = true;
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else
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*compressed = false;
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return length;
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}
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