forked from luck/tmp_suning_uos_patched
1b17159e52
Also, save/restore __bi_remaining in case the bio was used in a BIO_CHAIN (e.g. due to blk_queue_split). Suggested-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
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*
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* This file is released under the GPL.
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*/
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#ifndef DM_BIO_RECORD_H
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#define DM_BIO_RECORD_H
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#include <linux/bio.h>
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/*
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* There are lots of mutable fields in the bio struct that get
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* changed by the lower levels of the block layer. Some targets,
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* such as multipath, may wish to resubmit a bio on error. The
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* functions in this file help the target record and restore the
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* original bio state.
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*/
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struct dm_bio_details {
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struct gendisk *bi_disk;
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u8 bi_partno;
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int __bi_remaining;
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unsigned long bi_flags;
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struct bvec_iter bi_iter;
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bio_end_io_t *bi_end_io;
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
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struct bio_integrity_payload *bi_integrity;
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#endif
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};
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static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
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{
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bd->bi_disk = bio->bi_disk;
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bd->bi_partno = bio->bi_partno;
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bd->bi_flags = bio->bi_flags;
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bd->bi_iter = bio->bi_iter;
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bd->__bi_remaining = atomic_read(&bio->__bi_remaining);
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bd->bi_end_io = bio->bi_end_io;
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
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bd->bi_integrity = bio_integrity(bio);
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#endif
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}
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static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
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{
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bio->bi_disk = bd->bi_disk;
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bio->bi_partno = bd->bi_partno;
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bio->bi_flags = bd->bi_flags;
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bio->bi_iter = bd->bi_iter;
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atomic_set(&bio->__bi_remaining, bd->__bi_remaining);
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bio->bi_end_io = bd->bi_end_io;
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
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bio->bi_integrity = bd->bi_integrity;
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#endif
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}
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#endif
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