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md: use seconds granularity for error logging 

The md code stores the exact time of the last error in the
last_read_error variable using a timespec structure. It only
ever uses the seconds portion of that though, so we can
use a scalar for it.

There won't be an overflow in 2038 here, because it already
used monotonic time and 32-bit is enough for that, but I've
decided to use time64_t for consistency in the conversion.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Arnd Bergmann 2016-06-17 17:33:10 +02:00 committed by Shaohua Li
parent d787be4092
commit 0e3ef49eda
3 changed files with 7 additions and 9 deletions
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3
drivers/md/md.c
View File

@ -3173,8 +3173,7 @@ int md_rdev_init(struct md_rdev *rdev)
rdev->data_offset = 0;
rdev->new_data_offset = 0;
rdev->sb_events = 0;
rdev->last_read_error.tv_sec = 0;
rdev->last_read_error.tv_nsec = 0;
rdev->last_read_error = 0;
rdev->sb_loaded = 0;
rdev->bb_page = NULL;
atomic_set(&rdev->nr_pending, 0);

2
drivers/md/md.h
View File

@ -99,7 +99,7 @@ struct md_rdev {
atomic_t read_errors; /* number of consecutive read errors that
* we have tried to ignore.
*/
struct timespec last_read_error; /* monotonic time since our
time64_t last_read_error; /* monotonic time since our
* last read error
*/
atomic_t corrected_errors; /* number of corrected read errors,

11
drivers/md/raid10.c
View File

@ -2174,21 +2174,20 @@ static void recovery_request_write(struct mddev *mddev, struct r10bio *r10_bio)
*/
static void check_decay_read_errors(struct mddev *mddev, struct md_rdev *rdev)
{
struct timespec cur_time_mon;
long cur_time_mon;
unsigned long hours_since_last;
unsigned int read_errors = atomic_read(&rdev->read_errors);
ktime_get_ts(&cur_time_mon);
cur_time_mon = ktime_get_seconds();
if (rdev->last_read_error.tv_sec == 0 &&
rdev->last_read_error.tv_nsec == 0) {
if (rdev->last_read_error == 0) {
/* first time we've seen a read error */
rdev->last_read_error = cur_time_mon;
return;
}
hours_since_last = (cur_time_mon.tv_sec -
rdev->last_read_error.tv_sec) / 3600;
hours_since_last = (long)(cur_time_mon -
rdev->last_read_error) / 3600;
rdev->last_read_error = cur_time_mon;