spin_lock_init(&group->fanotify_data.access_lock);
--
cgit v0.10.1
-
-
-Hi all,
- There is a risk of data loss with md/raid6 arrays running on Linux since
- 2.6.32.
- If:
- - the array is doubly degraded
- - one or both failed devices are being recovered, and
- - the array is written to
-
- then it is possible for data on the array to be lost. The patch below fixes
- the problem. If you apply the patch to an older kernel which has separate
- handle_stripe5() and handle_stripe6() functions, be sure that patch changes
- handle_stripe6().
-
- There is no risk to an optimal array or a singly-degraded array. There is
- also no risk on a doubly-degraded array which is not recovering a device or
- is not receiving write requests.
-
- If you have data on a RAID6 array, please consider how to avoid corruption,
- possibly by applying the patch, possibly by removing any hot spares so
- recovery does not automatically start.
-
- This patch will be sent upstream shortly and will subsequently appear in
- future "-stable" kernels.
-
-NeilBrown
-
-From f94e37dce722ec7b6666fd04be357f422daa02b5 Mon Sep 17 00:00:00 2001
-From: NeilBrown <neilb@suse.de>
-Date: Wed, 13 Aug 2014 09:57:07 +1000
-Subject: [PATCH] md/raid6: avoid data corruption during recovery of
- double-degraded RAID6
-
-During recovery of a double-degraded RAID6 it is possible for
-some blocks not to be recovered properly, leading to corruption.
-
-If a write happens to one block in a stripe that would be written to a
-missing device, and at the same time that stripe is recovering data
-to the other missing device, then that recovered data may not be written.
-
-This patch skips, in the double-degraded case, an optimisation that is
-only safe for single-degraded arrays.
-
-Bug was introduced in 2.6.32 and fix is suitable for any kernel since
-then. In an older kernel with separate handle_stripe5() and
-handle_stripe6() functions that patch must change handle_stripe6().
-
-Cc: stable@vger.kernel.org (2.6.32+)
-Fixes: 6c0069c0ae9659e3a91b68eaed06a5c6c37f45c8
-Cc: Yuri Tikhonov <yur@emcraft.com>
-Cc: Dan Williams <dan.j.williams@intel.com>
-Reported-by: "Manibalan P" <pmanibalan@amiindia.co.in>
-Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1090423
-Signed-off-by: NeilBrown <neilb@suse.de>
-
-diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
-index 6b2d615d1094..183588b11fc1 100644
---- a/drivers/md/raid5.c
-+++ b/drivers/md/raid5.c
-@@ -3817,6 +3817,8 @@ static void handle_stripe(struct stripe_head *sh)
- set_bit(R5_Wantwrite, &dev->flags);
- if (prexor)
- continue;
-+ if (s.failed > 1)
-+ continue;
- if (!test_bit(R5_Insync, &dev->flags) ||
- ((i == sh->pd_idx || i == sh->qd_idx) &&
- s.failed == 0))
-
-
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