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fs: Get proper reference for s_bdi
So far we just relied on block device to hold a bdi reference for us while the filesystem is mounted. While that works perfectly fine, it is a bit awkward that we have a pointer to a refcounted structure in the superblock without proper reference. So make s_bdi hold a proper reference to block device's BDI. No filesystem using mount_bdev() actually changes s_bdi so this is safe and will make bdev filesystems work the same way as filesystems needing to set up their private bdi. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <axboe@fb.com>
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@ -1054,12 +1054,9 @@ static int set_bdev_super(struct super_block *s, void *data)
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{
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s->s_bdev = data;
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s->s_dev = s->s_bdev->bd_dev;
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s->s_bdi = bdi_get(s->s_bdev->bd_bdi);
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s->s_iflags |= SB_I_DYNBDI;
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/*
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* We set the bdi here to the queue backing, file systems can
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* overwrite this in ->fill_super()
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*/
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s->s_bdi = bdev_get_queue(s->s_bdev)->backing_dev_info;
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return 0;
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}
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