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| author | Xiao Ni <xni@redhat.com> | 2018-08-30 15:57:09 +0800 |
|---|---|---|
| committer | Shaohua Li <shli@fb.com> | 2018-08-31 17:38:10 -0700 |
| commit | 1d0ffd264204eba1861865560f1f7f7a92919384 (patch) | |
| tree | 0001aaa48ec025480a9057d4d9c6763cc1e23e64 /drivers/md | |
| parent | e254de6bcf3f5b6e78a92ac95fb91acef8adfe1a (diff) | |
| download | linux-stable-1d0ffd264204eba1861865560f1f7f7a92919384.tar.gz linux-stable-1d0ffd264204eba1861865560f1f7f7a92919384.tar.bz2 linux-stable-1d0ffd264204eba1861865560f1f7f7a92919384.zip | |
RAID10 BUG_ON in raise_barrier when force is true and conf->barrier is 0
In raid10 reshape_request it gets max_sectors in read_balance. If the underlayer disks
have bad blocks, the max_sectors is less than last. It will call goto read_more many
times. It calls raise_barrier(conf, sectors_done != 0) every time. In this condition
sectors_done is not 0. So the value passed to the argument force of raise_barrier is
true.
In raise_barrier it checks conf->barrier when force is true. If force is true and
conf->barrier is 0, it panic. In this case reshape_request submits bio to under layer
disks. And in the callback function of the bio it calls lower_barrier. If the bio
finishes before calling raise_barrier again, it can trigger the BUG_ON.
Add one pair of raise_barrier/lower_barrier to fix this bug.
Signed-off-by: Xiao Ni <xni@redhat.com>
Suggested-by: Neil Brown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid10.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 981898049491..d6f7978b4449 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -4529,11 +4529,12 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, allow_barrier(conf); } + raise_barrier(conf, 0); read_more: /* Now schedule reads for blocks from sector_nr to last */ r10_bio = raid10_alloc_init_r10buf(conf); r10_bio->state = 0; - raise_barrier(conf, sectors_done != 0); + raise_barrier(conf, 1); atomic_set(&r10_bio->remaining, 0); r10_bio->mddev = mddev; r10_bio->sector = sector_nr; @@ -4629,6 +4630,8 @@ read_more: if (sector_nr <= last) goto read_more; + lower_barrier(conf); + /* Now that we have done the whole section we can * update reshape_progress */ |