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| author | NeilBrown <neilb@suse.com> | 2016-06-02 16:19:53 +1000 |
|---|---|---|
| committer | Shaohua Li <shli@fb.com> | 2016-06-13 11:54:21 -0700 |
| commit | f5b67ae86ee317db20c0e10d54f16a0bbbd3207d (patch) | |
| tree | 8db4539e9c9f05624f2b198ddd1ccce54b281ce6 /tools/perf/scripts/python | |
| parent | md/multipath: add rcu protection to rdev access in multipath_status. (diff) | |
| download | linux-f5b67ae86ee317db20c0e10d54f16a0bbbd3207d.tar.gz linux-f5b67ae86ee317db20c0e10d54f16a0bbbd3207d.zip | |
md: be extra careful not to take a reference to a Faulty device.
It is important that we never increment rdev->nr_pending on a Faulty
device as ->hot_remove_disk() assumes that once the Faulty flag is visible
no code will take a new reference.
Some places take a new reference after only check In_sync. This should
be safe as the two are changed together. However to make the code more
obviously safe, add checks for 'Faulty' as well.
Note: the actual rule is:
Never increment nr_pending if Faulty is set and Blocked is clear,
never clear Faulty, and never set Blocked without holding a reference
through nr_pending.
fix build error (Shaohua)
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions