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| author | Shaohua Li <shli@fb.com> | 2015-09-04 14:14:16 -0700 |
|---|---|---|
| committer | NeilBrown <neilb@suse.com> | 2015-11-01 13:48:27 +1100 |
| commit | 253f9fd41afe2492b85de779946b5882a00dcdc5 (patch) | |
| tree | b8861ac9970c0306dd05cb3fe0242ce953d79f4e /lib/is_single_threaded.c | |
| parent | 85f2f9a4f49d3e3230b3c5fb08362d561691421e (diff) | |
| download | linux-253f9fd41afe2492b85de779946b5882a00dcdc5.tar.gz | |
raid5-cache: don't delay stripe captured in log
There is a case a stripe gets delayed forever.
1. a stripe finishes construction
2. a new bio hits the stripe
3. handle_stripe runs for the stripe. The stripe gets DELAYED bit set
since construction can't run for new bio (the stripe is locked since
step 1)
Without log, handle_stripe will call ops_run_io. After IO finishes, the
stripe gets unlocked and the stripe will restart and run construction
for the new bio. With log, ops_run_io need to run two times. If the
DELAYED bit set, the stripe can't enter into the handle_list, so the
second ops_run_io doesn't run, which leaves the stripe stalled.
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Diffstat (limited to 'lib/is_single_threaded.c')
0 files changed, 0 insertions, 0 deletions