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author | David S. Miller <davem@davemloft.net> | 2018-03-06 00:53:44 -0500 |
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committer | David S. Miller <davem@davemloft.net> | 2018-03-06 01:20:46 -0500 |
commit | 0f3e9c97eb5a97972b0c0076a5cc01bb142f8e70 (patch) | |
tree | 439c89ea3c87496c23e167148f2cdbefb6e82b30 /drivers/md/raid10.h | |
parent | Merge branch 'mvpp2-jumbo-frames-support' (diff) | |
parent | Merge tag 'please-pull-ia64_misc' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux (diff) | |
download | linux-dev-0f3e9c97eb5a97972b0c0076a5cc01bb142f8e70.tar.xz linux-dev-0f3e9c97eb5a97972b0c0076a5cc01bb142f8e70.zip |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
All of the conflicts were cases of overlapping changes.
In net/core/devlink.c, we have to make care that the
resouce size_params have become a struct member rather
than a pointer to such an object.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/md/raid10.h')
-rw-r--r-- | drivers/md/raid10.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/md/raid10.h b/drivers/md/raid10.h index db2ac22ac1b4..e2e8840de9bf 100644 --- a/drivers/md/raid10.h +++ b/drivers/md/raid10.h @@ -2,6 +2,19 @@ #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; |