mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Kent Overstreet](/assets/img/avatar_default.png)
Immutable biovecs are going to require an explicit iterator. To implement immutable bvecs, a later patch is going to add a bi_bvec_done member to this struct; for now, this patch effectively just renames things. Signed-off-by: Kent Overstreet <kmo@daterainc.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: "Ed L. Cashin" <ecashin@coraid.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Lars Ellenberg <drbd-dev@lists.linbit.com> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Matthew Wilcox <willy@linux.intel.com> Cc: Geoff Levand <geoff@infradead.org> Cc: Yehuda Sadeh <yehuda@inktank.com> Cc: Sage Weil <sage@inktank.com> Cc: Alex Elder <elder@inktank.com> Cc: ceph-devel@vger.kernel.org Cc: Joshua Morris <josh.h.morris@us.ibm.com> Cc: Philip Kelleher <pjk1939@linux.vnet.ibm.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Neil Brown <neilb@suse.de> Cc: Alasdair Kergon <agk@redhat.com> Cc: Mike Snitzer <snitzer@redhat.com> Cc: dm-devel@redhat.com Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: linux390@de.ibm.com Cc: Boaz Harrosh <bharrosh@panasas.com> Cc: Benny Halevy <bhalevy@tonian.com> Cc: "James E.J. Bottomley" <JBottomley@parallels.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "Nicholas A. Bellinger" <nab@linux-iscsi.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Chris Mason <chris.mason@fusionio.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: Jaegeuk Kim <jaegeuk.kim@samsung.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Dave Kleikamp <shaggy@kernel.org> Cc: Joern Engel <joern@logfs.org> Cc: Prasad Joshi <prasadjoshi.linux@gmail.com> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: KONISHI Ryusuke <konishi.ryusuke@lab.ntt.co.jp> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Ben Myers <bpm@sgi.com> Cc: xfs@oss.sgi.com Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Len Brown <len.brown@intel.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> Cc: Ben Hutchings <ben@decadent.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Guo Chao <yan@linux.vnet.ibm.com> Cc: Tejun Heo <tj@kernel.org> Cc: Asai Thambi S P <asamymuthupa@micron.com> Cc: Selvan Mani <smani@micron.com> Cc: Sam Bradshaw <sbradshaw@micron.com> Cc: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Cc: "Roger Pau Monné" <roger.pau@citrix.com> Cc: Jan Beulich <jbeulich@suse.com> Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Cc: Ian Campbell <Ian.Campbell@citrix.com> Cc: Sebastian Ott <sebott@linux.vnet.ibm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Jiang Liu <jiang.liu@huawei.com> Cc: Nitin Gupta <ngupta@vflare.org> Cc: Jerome Marchand <jmarchand@redhat.com> Cc: Joe Perches <joe@perches.com> Cc: Peng Tao <tao.peng@emc.com> Cc: Andy Adamson <andros@netapp.com> Cc: fanchaoting <fanchaoting@cn.fujitsu.com> Cc: Jie Liu <jeff.liu@oracle.com> Cc: Sunil Mushran <sunil.mushran@gmail.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: Namjae Jeon <namjae.jeon@samsung.com> Cc: Pankaj Kumar <pankaj.km@samsung.com> Cc: Dan Magenheimer <dan.magenheimer@oracle.com> Cc: Mel Gorman <mgorman@suse.de>6
71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
struct dm_bio_vec_details {
|
|
#if PAGE_SIZE < 65536
|
|
__u16 bv_len;
|
|
__u16 bv_offset;
|
|
#else
|
|
unsigned bv_len;
|
|
unsigned bv_offset;
|
|
#endif
|
|
};
|
|
|
|
struct dm_bio_details {
|
|
sector_t bi_sector;
|
|
struct block_device *bi_bdev;
|
|
unsigned int bi_size;
|
|
unsigned short bi_idx;
|
|
unsigned long bi_flags;
|
|
struct dm_bio_vec_details bi_io_vec[BIO_MAX_PAGES];
|
|
};
|
|
|
|
static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
|
|
{
|
|
unsigned i;
|
|
|
|
bd->bi_sector = bio->bi_iter.bi_sector;
|
|
bd->bi_bdev = bio->bi_bdev;
|
|
bd->bi_size = bio->bi_iter.bi_size;
|
|
bd->bi_idx = bio->bi_iter.bi_idx;
|
|
bd->bi_flags = bio->bi_flags;
|
|
|
|
for (i = 0; i < bio->bi_vcnt; i++) {
|
|
bd->bi_io_vec[i].bv_len = bio->bi_io_vec[i].bv_len;
|
|
bd->bi_io_vec[i].bv_offset = bio->bi_io_vec[i].bv_offset;
|
|
}
|
|
}
|
|
|
|
static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
|
|
{
|
|
unsigned i;
|
|
|
|
bio->bi_iter.bi_sector = bd->bi_sector;
|
|
bio->bi_bdev = bd->bi_bdev;
|
|
bio->bi_iter.bi_size = bd->bi_size;
|
|
bio->bi_iter.bi_idx = bd->bi_idx;
|
|
bio->bi_flags = bd->bi_flags;
|
|
|
|
for (i = 0; i < bio->bi_vcnt; i++) {
|
|
bio->bi_io_vec[i].bv_len = bd->bi_io_vec[i].bv_len;
|
|
bio->bi_io_vec[i].bv_offset = bd->bi_io_vec[i].bv_offset;
|
|
}
|
|
}
|
|
|
|
#endif
|