[PATCH 4.8 100/138] RAID1: ignore discard error

4.8-stable review patch. If anyone has any objections, please let me know. -- From: Shaohua Li commit e3f948cd3283e4fbe5907f1f3967c839912f480e upstream. If a write error occurs, raid1 will try to rewrite the bio in small chunk size. If the rewrite fails, raid1

[PATCH 4.8 100/138] RAID1: ignore discard error

4.8-stable review patch. If anyone has any objections, please let me know. -- From: Shaohua Li commit e3f948cd3283e4fbe5907f1f3967c839912f480e upstream. If a write error occurs, raid1 will try to rewrite the bio in small chunk size. If the rewrite fails, raid1 will record the