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authorJens Axboe <axboe@fb.com>2017-02-17 21:40:44 +0300
committerJens Axboe <axboe@fb.com>2017-02-17 22:35:47 +0300
commit7520872c0cf4d3df6d74242c6edfb9e70a47df4d (patch)
treee33287e1a152ee6d2f2b47f1eb3df0a6c66ae955 /block/Kconfig
parent64765a75ef258c802f795558d00a5a1864c531fc (diff)
downloadlinux-7520872c0cf4d3df6d74242c6edfb9e70a47df4d.tar.xz
block: don't defer flushes on blk-mq + scheduling
For blk-mq with scheduling, we can potentially end up with ALL driver tags assigned and sitting on the flush queues. If we defer because of an inlfight data request, then we can deadlock if that data request doesn't already have a tag assigned. This fixes a deadlock with running the xfs/297 xfstest, where thousands of syncs can cause the drive queue to stall. Signed-off-by: Jens Axboe <axboe@fb.com> Reviewed-by: Omar Sandoval <osandov@fb.com>
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