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| author | NeilBrown <neilb@suse.de> | 2013-08-27 15:52:13 +1000 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2013-08-28 16:58:36 +1000 |
| commit | c46501b2deaa06efcaaf82917281941f02c6b307 (patch) | |
| tree | bafe1a096cda8f657074d59cec815b7ae717cd96 /drivers/md/raid5.h | |
| parent | b721420e8719131896b009b11edbbd27d9b85e98 (diff) | |
| download | linux-c46501b2deaa06efcaaf82917281941f02c6b307.tar.bz2 | |
md/raid5: use seqcount to protect access to shape in make_request.
make_request() access various shape parameters (raid_disks, chunk_size
etc) which might be changed by raid5_start_reshape().
If the later is called at and awkward time during the form, the wrong
stripe_head might be used.
So introduce a 'seqcount' and after finding a stripe_head make sure
there is no reason to expect that we got the wrong one.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/raid5.h')
| -rw-r--r-- | drivers/md/raid5.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 105366371fbf..435b12d58165 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -400,6 +400,7 @@ struct r5conf { int prev_chunk_sectors; int prev_algo; short generation; /* increments with every reshape */ + seqcount_t gen_lock; /* lock against generation changes */ unsigned long reshape_checkpoint; /* Time we last updated * metadata */ long long min_offset_diff; /* minimum difference between |