mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
b4ee178268
The current RAID 5/6 recovery code isn't quite prepared to handle missing devices. In particular, it expects a bio that we previously attempted to use in the read path, meaning that it has valid pages allocated. However, missing devices have a NULL blkdev, and we can't call bio_add_page() on a bio with a NULL blkdev. We could do manual manipulation of bio->bi_io_vec, but that's pretty gross. So instead, add a separate path that allows us to manually add pages to the rbio. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/*
|
|
* Copyright (C) 2012 Fusion-io All rights reserved.
|
|
* Copyright (C) 2012 Intel Corp. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#ifndef __BTRFS_RAID56__
|
|
#define __BTRFS_RAID56__
|
|
static inline int nr_parity_stripes(struct map_lookup *map)
|
|
{
|
|
if (map->type & BTRFS_BLOCK_GROUP_RAID5)
|
|
return 1;
|
|
else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
|
|
return 2;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static inline int nr_data_stripes(struct map_lookup *map)
|
|
{
|
|
return map->num_stripes - nr_parity_stripes(map);
|
|
}
|
|
#define RAID5_P_STRIPE ((u64)-2)
|
|
#define RAID6_Q_STRIPE ((u64)-1)
|
|
|
|
#define is_parity_stripe(x) (((x) == RAID5_P_STRIPE) || \
|
|
((x) == RAID6_Q_STRIPE))
|
|
|
|
struct btrfs_raid_bio;
|
|
struct btrfs_device;
|
|
|
|
int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
|
|
struct btrfs_bio *bbio, u64 stripe_len,
|
|
int mirror_num, int generic_io);
|
|
int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
|
|
struct btrfs_bio *bbio, u64 stripe_len);
|
|
|
|
void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
|
|
u64 logical);
|
|
|
|
struct btrfs_raid_bio *
|
|
raid56_parity_alloc_scrub_rbio(struct btrfs_root *root, struct bio *bio,
|
|
struct btrfs_bio *bbio, u64 stripe_len,
|
|
struct btrfs_device *scrub_dev,
|
|
unsigned long *dbitmap, int stripe_nsectors);
|
|
void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
|
|
|
|
struct btrfs_raid_bio *
|
|
raid56_alloc_missing_rbio(struct btrfs_root *root, struct bio *bio,
|
|
struct btrfs_bio *bbio, u64 length);
|
|
void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio);
|
|
|
|
int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
|
|
void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
|
|
#endif
|