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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>
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/*
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* Copyright (C) 2012 Fusion-io All rights reserved.
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* Copyright (C) 2012 Intel Corp. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS_RAID56__
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#define __BTRFS_RAID56__
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static inline int nr_parity_stripes(struct map_lookup *map)
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{
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if (map->type & BTRFS_BLOCK_GROUP_RAID5)
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return 1;
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else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
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return 2;
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else
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return 0;
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}
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static inline int nr_data_stripes(struct map_lookup *map)
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{
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return map->num_stripes - nr_parity_stripes(map);
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}
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#define RAID5_P_STRIPE ((u64)-2)
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#define RAID6_Q_STRIPE ((u64)-1)
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#define is_parity_stripe(x) (((x) == RAID5_P_STRIPE) || \
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((x) == RAID6_Q_STRIPE))
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struct btrfs_raid_bio;
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struct btrfs_device;
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int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
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struct btrfs_bio *bbio, u64 stripe_len,
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int mirror_num, int generic_io);
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int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
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struct btrfs_bio *bbio, u64 stripe_len);
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void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
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u64 logical);
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struct btrfs_raid_bio *
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raid56_parity_alloc_scrub_rbio(struct btrfs_root *root, struct bio *bio,
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struct btrfs_bio *bbio, u64 stripe_len,
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struct btrfs_device *scrub_dev,
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unsigned long *dbitmap, int stripe_nsectors);
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void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
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struct btrfs_raid_bio *
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raid56_alloc_missing_rbio(struct btrfs_root *root, struct bio *bio,
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struct btrfs_bio *bbio, u64 length);
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void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio);
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int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
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void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
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#endif
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