diff options
Diffstat (limited to 'drivers/s390/block/dasd_eckd.c')
-rw-r--r-- | drivers/s390/block/dasd_eckd.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index e3583502aca2..649eba51e048 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -3083,13 +3083,24 @@ static int dasd_eckd_format_device(struct dasd_device *base, } static bool test_and_set_format_track(struct dasd_format_entry *to_format, - struct dasd_block *block) + struct dasd_ccw_req *cqr) { + struct dasd_block *block = cqr->block; struct dasd_format_entry *format; unsigned long flags; bool rc = false; spin_lock_irqsave(&block->format_lock, flags); + if (cqr->trkcount != atomic_read(&block->trkcount)) { + /* + * The number of formatted tracks has changed after request + * start and we can not tell if the current track was involved. + * To avoid data corruption treat it as if the current track is + * involved + */ + rc = true; + goto out; + } list_for_each_entry(format, &block->format_list, list) { if (format->track == to_format->track) { rc = true; @@ -3109,6 +3120,7 @@ static void clear_format_track(struct dasd_format_entry *format, unsigned long flags; spin_lock_irqsave(&block->format_lock, flags); + atomic_inc(&block->trkcount); list_del_init(&format->list); spin_unlock_irqrestore(&block->format_lock, flags); } @@ -3170,8 +3182,11 @@ dasd_eckd_ese_format(struct dasd_device *startdev, struct dasd_ccw_req *cqr, } format->track = curr_trk; /* test if track is already in formatting by another thread */ - if (test_and_set_format_track(format, block)) + if (test_and_set_format_track(format, cqr)) { + /* this is no real error so do not count down retries */ + cqr->retries++; return ERR_PTR(-EEXIST); + } fdata.start_unit = curr_trk; fdata.stop_unit = curr_trk; |