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| author | Jens Axboe <axboe@fb.com> | 2014-02-12 09:34:01 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-02-12 09:36:37 -0700 |
| commit | c8123f8c9cb517403b51aa41c3c46ff5e10b2c17 (patch) | |
| tree | 434d3614e79458bc86e64a61034cbe9448177ea5 /block/blk-lib.c | |
| parent | abb97b8c502a270d59c0c2e1ecea78ad752372ee (diff) | |
| download | lwn-c8123f8c9cb517403b51aa41c3c46ff5e10b2c17.tar.gz lwn-c8123f8c9cb517403b51aa41c3c46ff5e10b2c17.zip | |
block: add cond_resched() to potentially long running ioctl discard loop
When mkfs issues a full device discard and the device only
supports discards of a smallish size, we can loop in
blkdev_issue_discard() for a long time. If preempt isn't enabled,
this can turn into a softlock situation and the kernel will
start complaining.
Add an explicit cond_resched() at the end of the loop to avoid
that.
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-lib.c')
| -rw-r--r-- | block/blk-lib.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c index 2da76c999ef3..97a733cf3d5f 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -119,6 +119,14 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector, atomic_inc(&bb.done); submit_bio(type, bio); + + /* + * We can loop for a long time in here, if someone does + * full device discards (like mkfs). Be nice and allow + * us to schedule out to avoid softlocking if preempt + * is disabled. + */ + cond_resched(); } blk_finish_plug(&plug); |