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linux-next/drivers/md/dm-bio-record.h

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
*
* This file is released under the GPL.
*/
#ifndef DM_BIO_RECORD_H
#define DM_BIO_RECORD_H
#include <linux/bio.h>
/*
* There are lots of mutable fields in the bio struct that get
* changed by the lower levels of the block layer. Some targets,
* such as multipath, may wish to resubmit a bio on error. The
* functions in this file help the target record and restore the
* original bio state.
*/
dm: preserve bi_io_vec when resubmitting bios Device mapper saves and restores various fields in the bio, but it doesn't save bi_io_vec. If the device driver modifies this after a partially successful request, dm-raid1 and dm-multipath may attempt to resubmit a bio that has bi_size inconsistent with the size of vector. To make requests resubmittable in dm-raid1 and dm-multipath, we must save and restore the bio vector as well. To reduce the memory overhead involved in this, we do not save the pages in a vector and use a 16-bit field size if the page size is less than 65536. Cc: stable@kernel.org Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2009-04-03 02:55:23 +08:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
struct dm_bio_details {
struct block_device *bi_bdev;
unsigned long bi_flags;
dm: Use bvec_iter for dm_bio_record() This patch doesn't itself have any functional changes, but immutable biovecs are going to add a bi_bvec_done member to bi_iter, which will need to be saved too here. Signed-off-by: Kent Overstreet <kmo@daterainc.com> Cc: Alasdair Kergon <agk@redhat.com> Cc: dm-devel@redhat.com Reviewed-by: Mike Snitzer <snitzer@redhat.com>
2013-08-08 05:24:19 +08:00
struct bvec_iter bi_iter;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
};
static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
{
bd->bi_bdev = bio->bi_bdev;
bd->bi_flags = bio->bi_flags;
dm: Use bvec_iter for dm_bio_record() This patch doesn't itself have any functional changes, but immutable biovecs are going to add a bi_bvec_done member to bi_iter, which will need to be saved too here. Signed-off-by: Kent Overstreet <kmo@daterainc.com> Cc: Alasdair Kergon <agk@redhat.com> Cc: dm-devel@redhat.com Reviewed-by: Mike Snitzer <snitzer@redhat.com>
2013-08-08 05:24:19 +08:00
bd->bi_iter = bio->bi_iter;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
{
bio->bi_bdev = bd->bi_bdev;
bio->bi_flags = bd->bi_flags;
dm: Use bvec_iter for dm_bio_record() This patch doesn't itself have any functional changes, but immutable biovecs are going to add a bi_bvec_done member to bi_iter, which will need to be saved too here. Signed-off-by: Kent Overstreet <kmo@daterainc.com> Cc: Alasdair Kergon <agk@redhat.com> Cc: dm-devel@redhat.com Reviewed-by: Mike Snitzer <snitzer@redhat.com>
2013-08-08 05:24:19 +08:00
bio->bi_iter = bd->bi_iter;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
#endif
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