Btrfs: fix wrong super generation mismatch when scrubbing supers

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We came a race condition when scrubbing superblocks, the story is:

In commiting transaction, we will update @last_trans_commited after
writting superblocks, if scrubber start after writting superblocks
and before updating @last_trans_commited, generation mismatch happens!

We fix this by checking @scrub_pause_req, and we won't start a srubber
until commiting transaction is finished.(after btrfs_scrub_continue()
finished.)

Reported-by: Sebastian Ochmann <ochmann@informatik.uni-bonn.de>
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>

...

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Wang Shilong 2013-12-04 21:15:19 +08:00 • committed by Chris Mason

parent 5a0f4e2c2b

commit 3cb0929ad2

1 changed files with 26 additions and 19 deletions

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fs/btrfs/scrub.c

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