aboutsummaryrefslogtreecommitdiff
path: root/block
diff options
context:
space:
mode:
authorJens Axboe <axboe@fb.com>2014-02-12 09:34:01 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-22 10:32:46 -0800
commitc5bdb3a52d40d1ef3b3f6fb3617d20bb47cee46c (patch)
treec66bd8cb89b5f9b7b89955caf67814eebbf19861 /block
parente7a95613d77dcbcbefe99b465c6488550caf2c85 (diff)
block: add cond_resched() to potentially long running ioctl discard loop
commit c8123f8c9cb517403b51aa41c3c46ff5e10b2c17 upstream. 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. Signed-off-by: Jens Axboe <axboe@fb.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block')
-rw-r--r--block/blk-lib.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c
index 2b461b496a7..36751e211bb 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -101,6 +101,14 @@ 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();
}
/* Wait for bios in-flight */