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authorVivek Goyal <vgoyal@redhat.com>2011-05-19 15:38:23 -0400
committerJens Axboe <jaxboe@fusionio.com>2011-05-20 20:34:52 +0200
commitf469a7b4d5b1d1d053200a9015fd25d59c057f49 (patch)
tree2c68c0689e40955b186e350b15d44d0b260f4655 /block/blk-core.c
parent56edf7d75db5b14d628b46623c414ffbeed68d7f (diff)
blk-cgroup: Allow sleeping while dynamically allocating a group
Currently, all the cfq_group or throtl_group allocations happen while we are holding ->queue_lock and sleeping is not allowed. Soon, we will move to per cpu stats and also need to allocate the per group stats. As one can not call alloc_percpu() from atomic context as it can sleep, we need to drop ->queue_lock, allocate the group, retake the lock and continue processing. In throttling code, I check the queue DEAD flag again to make sure that driver did not call blk_cleanup_queue() in the mean time. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk-core.c')
-rw-r--r--block/blk-core.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 3fe00a14822..9e8e297374b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1550,7 +1550,8 @@ static inline void __generic_make_request(struct bio *bio)
goto end_io;
}
- blk_throtl_bio(q, &bio);
+ if (blk_throtl_bio(q, &bio))
+ goto end_io;
/*
* If bio = NULL, bio has been throttled and will be submitted