diff options
Diffstat (limited to 'drivers/md/raid10.h')
| -rw-r--r-- | drivers/md/raid10.h | 50 |
1 files changed, 39 insertions, 11 deletions
diff --git a/drivers/md/raid10.h b/drivers/md/raid10.h index 157d69e83ff4..da00a55f7a55 100644 --- a/drivers/md/raid10.h +++ b/drivers/md/raid10.h @@ -1,6 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _RAID10_H #define _RAID10_H +/* Note: raid10_info.rdev can be set to NULL asynchronously by + * raid10_remove_disk. + * There are three safe ways to access raid10_info.rdev. + * 1/ when holding mddev->reconfig_mutex + * 2/ when resync/recovery/reshape is known to be happening - i.e. in code + * that is called as part of performing resync/recovery/reshape. + * 3/ while holding rcu_read_lock(), use rcu_dereference to get the pointer + * and if it is non-NULL, increment rdev->nr_pending before dropping the + * RCU lock. + * When .rdev is set to NULL, the nr_pending count checked again and if it has + * been incremented, the pointer is put back in .rdev. + */ + struct raid10_info { struct md_rdev *rdev, *replacement; sector_t head_position; @@ -53,15 +67,21 @@ struct r10conf { sector_t offset_diff; struct list_head retry_list; + /* A separate list of r1bio which just need raid_end_bio_io called. + * This mustn't happen for writes which had any errors if the superblock + * needs to be written. + */ + struct list_head bio_end_io_list; + /* queue pending writes and submit them on unplug */ struct bio_list pending_bio_list; - int pending_count; - spinlock_t resync_lock; - int nr_pending; + seqlock_t resync_lock; + atomic_t nr_pending; int nr_waiting; int nr_queued; int barrier; + int array_freeze_pending; sector_t next_resync; int fullsync; /* set to 1 if a full sync is needed, * (fresh device added). @@ -72,14 +92,21 @@ struct r10conf { */ wait_queue_head_t wait_barrier; - mempool_t *r10bio_pool; - mempool_t *r10buf_pool; + mempool_t r10bio_pool; + mempool_t r10buf_pool; struct page *tmppage; + struct bio_set bio_split; /* When taking over an array from a different personality, we store * the new thread here until we fully activate the array. */ - struct md_thread *thread; + struct md_thread __rcu *thread; + + /* + * Keep track of cluster resync window to send to other nodes. + */ + sector_t cluster_sync_low; + sector_t cluster_sync_high; }; /* @@ -125,7 +152,7 @@ struct r10bio { }; sector_t addr; int devnum; - } devs[0]; + } devs[]; }; /* bits for r10bio.state */ @@ -134,11 +161,12 @@ enum r10bio_state { R10BIO_IsSync, R10BIO_IsRecover, R10BIO_IsReshape, - R10BIO_Degraded, /* Set ReadError on bios that experience a read error * so that raid10d knows what to do with them. */ R10BIO_ReadError, +/* For bio_split errors, record that bi_end_io was called. */ + R10BIO_Returned, /* If a write for this request means we can clear some * known-bad-block records, we set this flag. */ @@ -149,8 +177,8 @@ enum r10bio_state { * flag is set */ R10BIO_Previous, +/* failfast devices did receive failfast requests. */ + R10BIO_FailFast, + R10BIO_Discard, }; - -extern int md_raid10_congested(struct mddev *mddev, int bits); - #endif |