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authorLinus Torvalds <torvalds@linux-foundation.org>2017-02-25 01:42:19 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-25 01:42:19 +0300
commita682e0035494c449e53a57d039f86f75b9e2fe67 (patch)
tree382d6c2d4729e6ed8f697fd528209a2b4701b618 /Documentation/admin-guide
parent1802979ab1ee8ec5a72987ad518f5a91bf41cd89 (diff)
parent1ec492232ed659acde8cc00b9ecc7529778e03e1 (diff)
downloadlinux-a682e0035494c449e53a57d039f86f75b9e2fe67.tar.xz
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md
Pull md updates from Shaohua Li: "Mainly fixes bugs and improves performance: - Improve scalability for raid1 from Coly - Improve raid5-cache read performance, disk efficiency and IO pattern from Song and me - Fix a race condition of disk hotplug for linear from Coly - A few cleanup patches from Ming and Byungchul - Fix a memory leak from Neil - Fix WRITE SAME IO failure from me - Add doc for raid5-cache from me" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md: (23 commits) md/raid1: fix write behind issues introduced by bio_clone_bioset_partial md/raid1: handle flush request correctly md/linear: shutup lockdep warnning md/raid1: fix a use-after-free bug RAID1: avoid unnecessary spin locks in I/O barrier code RAID1: a new I/O barrier implementation to remove resync window md/raid5: Don't reinvent the wheel but use existing llist API md: fast clone bio in bio_clone_mddev() md: remove unnecessary check on mddev md/raid1: use bio_clone_bioset_partial() in case of write behind md: fail if mddev->bio_set can't be created block: introduce bio_clone_bioset_partial() md: disable WRITE SAME if it fails in underlayer disks md/raid5-cache: exclude reclaiming stripes in reclaim check md/raid5-cache: stripe reclaim only counts valid stripes MD: add doc for raid5-cache Documentation: move MD related doc into a separate dir md: ensure md devices are freed before module is unloaded. md/r5cache: improve journal device efficiency md/r5cache: enable chunk_aligned_read with write back cache ...
Diffstat (limited to 'Documentation/admin-guide')
-rw-r--r--Documentation/admin-guide/md.rst5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/admin-guide/md.rst b/Documentation/admin-guide/md.rst
index e449fb5f277c..1e61bf50595c 100644
--- a/Documentation/admin-guide/md.rst
+++ b/Documentation/admin-guide/md.rst
@@ -725,3 +725,8 @@ These currently include:
to 1. Setting this to 0 disables bypass accounting and
requires preread stripes to wait until all full-width stripe-
writes are complete. Valid values are 0 to stripe_cache_size.
+
+ journal_mode (currently raid5 only)
+ The cache mode for raid5. raid5 could include an extra disk for
+ caching. The mode can be "write-throuth" and "write-back". The
+ default is "write-through".