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blk-mq: fix updating tags depth 

[ Upstream commit 75d6e175fc ]

The passed 'nr' from userspace represents the total depth, meantime
inside 'struct blk_mq_tags', 'nr_tags' stores the total tag depth,
and 'nr_reserved_tags' stores the reserved part.

There are two issues in blk_mq_tag_update_depth() now:

1) for growing tags, we should have used the passed 'nr', and keep the
number of reserved tags not changed.

2) the passed 'nr' should have been used for checking against
'tags->nr_tags', instead of number of the normal part.

This patch fixes the above two cases, and avoids kernel crash caused
by wrong resizing sbitmap queue.

Cc: "Ewan D. Milne" <emilne@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Omar Sandoval <osandov@fb.com>
Tested by: Marco Patalano <mpatalan@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Ming Lei 2018-08-02 18:23:26 +08:00 committed by Greg Kroah-Hartman
parent 47a6917f4b
commit 3ddbcd49bb
1 changed files with 4 additions and 4 deletions
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8
block/blk-mq-tag.c
View File

@ -416,8 +416,6 @@ int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
if (tdepth <= tags->nr_reserved_tags)
return -EINVAL;
tdepth -= tags->nr_reserved_tags;
/*
* If we are allowed to grow beyond the original size, allocate
* a new set of tags before freeing the old one.
@ -437,7 +435,8 @@ int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
if (tdepth > 16 * BLKDEV_MAX_RQ)
return -EINVAL;
new = blk_mq_alloc_rq_map(set, hctx->queue_num, tdepth, 0);
new = blk_mq_alloc_rq_map(set, hctx->queue_num, tdepth,
tags->nr_reserved_tags);
if (!new)
return -ENOMEM;
ret = blk_mq_alloc_rqs(set, new, hctx->queue_num, tdepth);
@ -454,7 +453,8 @@ int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
* Don't need (or can't) update reserved tags here, they
* remain static and should never need resizing.
*/
sbitmap_queue_resize(&tags->bitmap_tags, tdepth);
sbitmap_queue_resize(&tags->bitmap_tags,
tdepth - tags->nr_reserved_tags);
}
return 0;