From 67143510a7e3634a23f06a48445d1148b2fdbc4d Mon Sep 17 00:00:00 2001 From: Heinz Mauelshagen Date: Sat, 2 Dec 2017 01:03:53 +0100 Subject: dm raid: display a consistent copy of the MD status via raid_status() The MD sync thread updates recovery flags providing state of any running, idle, frozen, recovering, reshaping, ... activity it performs and updates respective flags asynchronously versus dm processing raid_status(). To close that race window, take a single copy of the flags and pass it into its callees. Signed-off-by: Heinz Mauelshagen Signed-off-by: Mike Snitzer --- drivers/md/dm-raid.c | 34 ++++++++++++++++++---------------- 1 file changed, 18 insertions(+), 16 deletions(-) (limited to 'drivers/md/dm-raid.c') diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index bf3c9e3c736d..3df7c5bd5a9b 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -3300,25 +3300,25 @@ 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_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"; } @@ -3350,7 +3350,7 @@ static const char *__raid_dev_status(struct raid_set *rs, struct md_rdev *rdev, } /* Helper to return resync/reshape progress for @rs and @array_in_sync */ -static sector_t rs_get_progress(struct raid_set *rs, +static sector_t rs_get_progress(struct raid_set *rs, unsigned long recovery, sector_t resync_max_sectors, bool *array_in_sync) { sector_t r, curr_resync_completed; @@ -3367,7 +3367,7 @@ static sector_t rs_get_progress(struct raid_set *rs, r = mddev->reshape_position; /* Reshape is relative to the array size */ - if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) || + if (test_bit(MD_RECOVERY_RESHAPE, &recovery) || r != MaxSector) { if (r == MaxSector) { *array_in_sync = true; @@ -3382,20 +3382,20 @@ static sector_t rs_get_progress(struct raid_set *rs, } /* Sync is relative to the component device size */ - } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) + } else if (test_bit(MD_RECOVERY_RUNNING, &recovery)) r = curr_resync_completed; else r = mddev->recovery_cp; if ((r == MaxSector) || - (test_bit(MD_RECOVERY_DONE, &mddev->recovery) && + (test_bit(MD_RECOVERY_DONE, &recovery) && (mddev->curr_resync_completed == resync_max_sectors))) { /* * Sync complete. */ *array_in_sync = true; r = resync_max_sectors; - } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { + } 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 @@ -3438,6 +3438,7 @@ static void raid_status(struct dm_target *ti, status_type_t type, 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; @@ -3457,13 +3458,14 @@ 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, &array_in_sync); 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++) -- cgit