37 lines
963 B
C
37 lines
963 B
C
/*
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* BFQ: I/O context handling.
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*
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* Based on ideas and code from CFQ:
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* Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
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*
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* Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
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* Paolo Valente <paolo.valente@unimore.it>
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*
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* Copyright (C) 2010 Paolo Valente <paolo.valente@unimore.it>
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*/
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/**
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* icq_to_bic - convert iocontext queue structure to bfq_io_cq.
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* @icq: the iocontext queue.
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*/
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static inline struct bfq_io_cq *icq_to_bic(struct io_cq *icq)
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{
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/* bic->icq is the first member, %NULL will convert to %NULL */
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return container_of(icq, struct bfq_io_cq, icq);
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}
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/**
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* bfq_bic_lookup - search into @ioc a bic associated to @bfqd.
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* @bfqd: the lookup key.
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* @ioc: the io_context of the process doing I/O.
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*
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* Queue lock must be held.
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*/
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static inline struct bfq_io_cq *bfq_bic_lookup(struct bfq_data *bfqd,
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struct io_context *ioc)
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{
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if (ioc)
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return icq_to_bic(ioc_lookup_icq(ioc, bfqd->queue));
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return NULL;
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}
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