diff options
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 42e68b2e0b41..41f766ab824a 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -7907,6 +7907,23 @@ void md_write_start(struct mddev *mddev, struct bio *bi) } EXPORT_SYMBOL(md_write_start); +/* md_write_inc can only be called when md_write_start() has + * already been called at least once of the current request. + * It increments the counter and is useful when a single request + * is split into several parts. Each part causes an increment and + * so needs a matching md_write_end(). + * Unlike md_write_start(), it is safe to call md_write_inc() inside + * a spinlocked region. + */ +void md_write_inc(struct mddev *mddev, struct bio *bi) +{ + if (bio_data_dir(bi) != WRITE) + return; + WARN_ON_ONCE(mddev->in_sync || mddev->ro); + atomic_inc(&mddev->writes_pending); +} +EXPORT_SYMBOL(md_write_inc); + void md_write_end(struct mddev *mddev) { if (atomic_dec_and_test(&mddev->writes_pending)) { |