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pstore: Populate pstore record->time field 

The current time will be initially available in the record->time field
for all pstore_read() and pstore_write() calls. Backends can either
update the field during read(), or use the field during write() instead
of fetching time themselves.

Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2017-05-19 15:29:10 -07:00
parent e581ca813a
commit c7f3c595f6
4 changed files with 15 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/firmware/efi/efi-pstore.c
View File

@ -244,9 +244,6 @@ static int efi_pstore_write(struct pstore_record *record)
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
int i, ret = 0;
record->time.tv_sec = get_seconds();
record->time.tv_nsec = 0;
record->id = generic_id(record->time.tv_sec, record->part,
record->count);

6
fs/pstore/platform.c
View File

@ -480,6 +480,12 @@ void pstore_record_init(struct pstore_record *record,
memset(record, 0, sizeof(*record));
record->psi = psinfo;
/* Report zeroed timestamp if called before timekeeping has resumed. */
if (__getnstimeofday(&record->time)) {
record->time.tv_sec = 0;
record->time.tv_nsec = 0;
}
}
/*

16
fs/pstore/ram.c
View File

@ -27,7 +27,6 @@
#include <linux/module.h>
#include <linux/version.h>
#include <linux/pstore.h>
#include <linux/time.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
@ -356,20 +355,15 @@ out:
}
static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
bool compressed)
struct pstore_record *record)
{
char *hdr;
struct timespec timestamp;
size_t len;
/* Report zeroed timestamp if called before timekeeping has resumed. */
if (__getnstimeofday(&timestamp)) {
timestamp.tv_sec = 0;
timestamp.tv_nsec = 0;
}
hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
(long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
compressed ? 'C' : 'D');
record->time.tv_sec,
record->time.tv_nsec / 1000,
record->compressed ? 'C' : 'D');
WARN_ON_ONCE(!hdr);
len = hdr ? strlen(hdr) : 0;
persistent_ram_write(prz, hdr, len);
@ -440,7 +434,7 @@ static int notrace ramoops_pstore_write(struct pstore_record *record)
prz = cxt->dprzs[cxt->dump_write_cnt];
/* Build header and append record contents. */
hlen = ramoops_write_kmsg_hdr(prz, record->compressed);
hlen = ramoops_write_kmsg_hdr(prz, record);
size = record->size;
if (size + hlen > prz->buffer_size)
size = prz->buffer_size - hlen;

5
include/linux/pstore.h
View File

@ -138,7 +138,10 @@ struct pstore_record {
* memory allocation may be broken during an Oops. Regardless,
* @buf must be proccesed or copied before returning. The
* backend is also expected to write @id with something that
8 can help identify this record to a future @erase callback.
* can help identify this record to a future @erase callback.
* The @time field will be prepopulated with the current time,
* when available. The @size field will have the size of data
* in @buf.
*
* Returns 0 on success, and non-zero on error.
*