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Linux Cross Reference
Linux-2.6.17/drivers/md/dm-bio-record.h

Version: ~ [ 2.6.16 ] ~ [ 2.6.17 ] ~
Architecture: ~ [ ia64 ] ~ [ i386 ] ~ [ arm ] ~ [ ppc ] ~ [ sparc64 ] ~ 
  1 /*
  2  * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
  3  *
  4  * This file is released under the GPL.
  5  */
  6 
  7 #ifndef DM_BIO_RECORD_H
  8 #define DM_BIO_RECORD_H
  9 
 10 #include <linux/bio.h>
 11 
 12 /*
 13  * There are lots of mutable fields in the bio struct that get
 14  * changed by the lower levels of the block layer.  Some targets,
 15  * such as multipath, may wish to resubmit a bio on error.  The
 16  * functions in this file help the target record and restore the
 17  * original bio state.
 18  */
 19 struct dm_bio_details {
 20         sector_t bi_sector;
 21         struct block_device *bi_bdev;
 22         unsigned int bi_size;
 23         unsigned short bi_idx;
 24         unsigned long bi_flags;
 25 };
 26 
 27 static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
 28 {
 29         bd->bi_sector = bio->bi_sector;
 30         bd->bi_bdev = bio->bi_bdev;
 31         bd->bi_size = bio->bi_size;
 32         bd->bi_idx = bio->bi_idx;
 33         bd->bi_flags = bio->bi_flags;
 34 }
 35 
 36 static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
 37 {
 38         bio->bi_sector = bd->bi_sector;
 39         bio->bi_bdev = bd->bi_bdev;
 40         bio->bi_size = bd->bi_size;
 41         bio->bi_idx = bd->bi_idx;
 42         bio->bi_flags = bd->bi_flags;
 43 }
 44 
 45 #endif
 46
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