[dm-devel] [PATCH 06/10] dm raid: clear out rs_get_progress()
heinzm at redhat.com
heinzm at redhat.com
Fri Dec 1 00:02:24 UTC 2017
From: Heinz Mauelshagen <heinzm at redhat.com>
Retrieve recovery flags once in raid_status() and pass them
into its callees to avoid racy updates during their processing.
Access raid array members for reshaping or synchronization/recovery
offsets when needed and pay attention to the respective recovery
flags when doing so. Address sync ratio issue as of related bz.
Related: rhbz1508070
---
drivers/md/dm-raid.c | 122 ++++++++++++++++++++++++++++++---------------------
1 file changed, 73 insertions(+), 49 deletions(-)
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index e37ee5f8ed3d..7fbb31ed9147 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -209,6 +209,8 @@ struct raid_dev {
#define RT_FLAG_UPDATE_SBS 3
#define RT_FLAG_RESHAPE_RS 4
#define RT_FLAG_RS_SUSPENDED 5
+#define RT_FLAG_RS_IN_SYNC 6
+#define RT_FLAG_RS_RESYNCING 7
/* Array elements of 64 bit needed for rebuild/failed disk bits */
#define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8)
@@ -3282,25 +3284,26 @@ static int raid_map(struct dm_target *ti, struct bio *bio)
}
/* Return string describing the current sync action of @mddev */
-static const char *decipher_sync_action(struct mddev *mddev)
+static const char *decipher_sync_action(struct mddev *mddev, unsigned long recovery)
{
- if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
+ if (test_bit(MD_RECOVERY_FROZEN, &recovery))
return "frozen";
- if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
- (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
- if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
+ if (!test_bit(MD_RECOVERY_DONE, &recovery) &&
+ (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
+ (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery)))) {
+ if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
return "reshape";
- if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
- if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
+ if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
+ if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
return "resync";
- else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
+ else if (test_bit(MD_RECOVERY_CHECK, &recovery))
return "check";
return "repair";
}
- if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
+ if (test_bit(MD_RECOVERY_RECOVER, &recovery))
return "recover";
}
@@ -3317,7 +3320,7 @@ static const char *decipher_sync_action(struct mddev *mddev)
* 'A' = Alive and in-sync raid set component _or_ alive raid4/5/6 'write_through' journal device
* '-' = Non-existing device (i.e. uspace passed '- -' into the ctr)
*/
-static const char *__raid_dev_status(struct raid_set *rs, struct md_rdev *rdev, bool array_in_sync)
+static const char *__raid_dev_status(struct raid_set *rs, struct md_rdev *rdev)
{
if (!rdev->bdev)
return "-";
@@ -3325,65 +3328,86 @@ static const char *__raid_dev_status(struct raid_set *rs, struct md_rdev *rdev,
return "D";
else if (test_bit(Journal, &rdev->flags))
return (rs->journal_dev.mode == R5C_JOURNAL_MODE_WRITE_THROUGH) ? "A" : "a";
- else if (!array_in_sync || !test_bit(In_sync, &rdev->flags))
+ else if (test_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags))
+ return "a";
+ else if (!test_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags) &&
+ !test_bit(In_sync, &rdev->flags))
return "a";
else
return "A";
}
-/* Helper to return resync/reshape progress for @rs and @array_in_sync */
-static sector_t rs_get_progress(struct raid_set *rs,
- sector_t resync_max_sectors, bool *array_in_sync)
+/* Helper to return resync/reshape progress for @rs and runtime flags for raid set in sync / resynching */
+static sector_t rs_get_progress(struct raid_set *rs, unsigned long recovery,
+ sector_t resync_max_sectors)
{
- sector_t r, curr_resync_completed;
+ sector_t r;
struct mddev *mddev = &rs->md;
- curr_resync_completed = mddev->curr_resync_completed ?: mddev->recovery_cp;
- *array_in_sync = false;
+ clear_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
+ clear_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags);
if (rs_is_raid0(rs)) {
r = resync_max_sectors;
- *array_in_sync = true;
+ set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
} else {
- r = mddev->reshape_position;
-
/* Reshape is relative to the array size */
- if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
- r != MaxSector) {
- if (r == MaxSector) {
- *array_in_sync = true;
- r = resync_max_sectors;
- } else {
+ if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) {
+ r = mddev->reshape_position;
+ if (r != MaxSector) {
/* Got to reverse on backward reshape */
if (mddev->reshape_backwards)
r = mddev->array_sectors - r;
- /* Devide by # of data stripes */
- sector_div(r, mddev_data_stripes(rs));
+ /* Divide by # of data stripes unless raid1 */
+ if (!rs_is_raid1(rs))
+ sector_div(r, mddev_data_stripes(rs));
}
- /* Sync is relative to the component device size */
- } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
- r = curr_resync_completed;
+ /*
+ * Sync/recover is relative to the component device size.
+ *
+ * MD_RECOVERY_NEEDED for https://bugzilla.redhat.com/show_bug.cgi?id=1508070
+ */
+ } else if (test_bit(MD_RECOVERY_NEEDED, &recovery) ||
+ test_bit(MD_RECOVERY_RUNNING, &recovery))
+ r = mddev->curr_resync_completed;
+
else
r = mddev->recovery_cp;
- if ((r == MaxSector) ||
- (test_bit(MD_RECOVERY_DONE, &mddev->recovery) &&
- (mddev->curr_resync_completed == resync_max_sectors))) {
+ if (r >= resync_max_sectors &&
+ (!test_bit(MD_RECOVERY_REQUESTED, &recovery) ||
+ (!test_bit(MD_RECOVERY_FROZEN, &recovery) &&
+ !test_bit(MD_RECOVERY_NEEDED, &recovery) &&
+ !test_bit(MD_RECOVERY_RUNNING, &recovery)))) {
/*
* Sync complete.
*/
- *array_in_sync = true;
- r = resync_max_sectors;
- } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
+ if (test_bit(MD_RECOVERY_RECOVER, &recovery))
+ set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
+
+ } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) {
+ ;
+
+ } else if (test_bit(MD_RECOVERY_SYNC, &recovery) &&
+ !test_bit(MD_RECOVERY_REQUESTED, &recovery)) {
+ /*
+ * If "resync" is occurring, the raid set has
+ * undergone an initial sync and the health characters
+ * should not be 'a' anymore.
+ */
+ set_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags);
+
+ } else if (test_bit(MD_RECOVERY_REQUESTED, &recovery)) {
/*
* If "check" or "repair" is occurring, the raid set has
* undergone an initial sync and the health characters
* should not be 'a' anymore.
*/
- *array_in_sync = true;
+ set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
+
} else {
struct md_rdev *rdev;
@@ -3395,15 +3419,14 @@ static sector_t rs_get_progress(struct raid_set *rs,
*/
rdev_for_each(rdev, mddev)
if (!test_bit(Journal, &rdev->flags) &&
- !test_bit(In_sync, &rdev->flags))
- *array_in_sync = true;
-#if 0
- r = 0; /* HM FIXME: TESTME: https://bugzilla.redhat.com/show_bug.cgi?id=1210637 ? */
-#endif
+ !test_bit(In_sync, &rdev->flags)) {
+ set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
+ break;
+ }
}
}
- return r;
+ return min(r, resync_max_sectors);
}
/* Helper to return @dev name or "-" if !@dev */
@@ -3419,7 +3442,7 @@ static void raid_status(struct dm_target *ti, status_type_t type,
struct mddev *mddev = &rs->md;
struct r5conf *conf = mddev->private;
int i, max_nr_stripes = conf ? conf->max_nr_stripes : 0;
- bool array_in_sync;
+ unsigned long recovery;
unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */
unsigned int sz = 0;
unsigned int rebuild_disks;
@@ -3439,17 +3462,18 @@ static void raid_status(struct dm_target *ti, status_type_t type,
/* Access most recent mddev properties for status output */
smp_rmb();
+ recovery = rs->md.recovery;
/* Get sensible max sectors even if raid set not yet started */
resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ?
mddev->resync_max_sectors : mddev->dev_sectors;
- progress = rs_get_progress(rs, resync_max_sectors, &array_in_sync);
+ progress = rs_get_progress(rs, recovery, resync_max_sectors);
resync_mismatches = (mddev->last_sync_action && !strcasecmp(mddev->last_sync_action, "check")) ?
atomic64_read(&mddev->resync_mismatches) : 0;
- sync_action = decipher_sync_action(&rs->md);
+ sync_action = decipher_sync_action(&rs->md, recovery);
/* HM FIXME: do we want another state char for raid0? It shows 'D'/'A'/'-' now */
for (i = 0; i < rs->raid_disks; i++)
- DMEMIT(__raid_dev_status(rs, &rs->dev[i].rdev, array_in_sync));
+ DMEMIT(__raid_dev_status(rs, &rs->dev[i].rdev));
/*
* In-sync/Reshape ratio:
@@ -3500,7 +3524,7 @@ static void raid_status(struct dm_target *ti, status_type_t type,
* v1.10.0+:
*/
DMEMIT(" %s", test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags) ?
- __raid_dev_status(rs, &rs->journal_dev.rdev, 0) : "-");
+ __raid_dev_status(rs, &rs->journal_dev.rdev) : "-");
break;
case STATUSTYPE_TABLE:
--
2.13.6
More information about the dm-devel
mailing list