Commit 0e3ef49e authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Shaohua Li
Browse files

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: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarShaohua Li <shli@fb.com>
parent d787be40

drivers/md/md.c

+1 −2
Original line number Diff line number Diff line
@@ -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);

drivers/md/md.h

+1 −1
Original line number Diff line number Diff line
@@ -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,

drivers/md/raid10.c

+5 −6
Original line number Diff line number Diff line
@@ -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;

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