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| author | Heinz Mauelshagen <heinzm@redhat.com> | 2018-02-02 23:13:19 +0100 |
|---|---|---|
| committer | Shaohua Li <sh.li@alibaba-inc.com> | 2018-02-18 10:11:59 -0800 |
| commit | 4b6c1060eaa6495aa5b0032e8f2d51dd936b1257 (patch) | |
| tree | 6060f030df613e4b68d18bc6c150bdfa02077444 /drivers/md/md.h | |
| parent | b126194cbb799f9980b92a77e58db6ad794c8082 (diff) | |
| download | linux-4b6c1060eaa6495aa5b0032e8f2d51dd936b1257.tar.gz linux-4b6c1060eaa6495aa5b0032e8f2d51dd936b1257.tar.bz2 linux-4b6c1060eaa6495aa5b0032e8f2d51dd936b1257.zip | |
md: fix md_write_start() deadlock w/o metadata devices
If no metadata devices are configured on raid1/4/5/6/10
(e.g. via dm-raid), md_write_start() unconditionally waits
for superblocks to be written thus deadlocking.
Fix introduces mddev->has_superblocks bool, defines it in md_run()
and checks for it in md_write_start() to conditionally avoid waiting.
Once on it, check for non-existing superblocks in md_super_write().
Link: https://bugzilla.kernel.org/show_bug.cgi?id=198647
Fixes: cc27b0c78c796 ("md: fix deadlock between mddev_suspend() and md_write_start()")
Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Shaohua Li <sh.li@alibaba-inc.com>
Diffstat (limited to 'drivers/md/md.h')
| -rw-r--r-- | drivers/md/md.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h index 58cd20a5e85e..fbc925cce810 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -468,6 +468,8 @@ struct mddev { void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); struct md_cluster_info *cluster_info; unsigned int good_device_nr; /* good device num within cluster raid */ + + bool has_superblocks:1; }; enum recovery_flags { |