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Btrfs: Set real mirror number for read operation on RAID0/5/6 

We need real mirror number for RAID0/5/6 when reading data, or if read error
happens, we would pass 0 as the number of the mirror on which the io error
happens. It is wrong and would cause the filesystem read the data from the
corrupted mirror again.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
hifive-unleashed-5.1
Miao Xie 2014-09-12 18:44:02 +08:00 committed by Chris Mason
parent 1203b6813e
commit 28e1cc7d1b
1 changed files with 5 additions and 0 deletions
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5
fs/btrfs/volumes.c
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@ -5073,6 +5073,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
num_stripes = min_t(u64, map->num_stripes,
stripe_nr_end - stripe_nr_orig);
stripe_index = do_div(stripe_nr, map->num_stripes);
if (!(rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)))
mirror_num = 1;
} else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS))
num_stripes = map->num_stripes;
@ -5176,6 +5178,9 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
/* We distribute the parity blocks across stripes */
tmp = stripe_nr + stripe_index;
stripe_index = do_div(tmp, map->num_stripes);
if (!(rw & (REQ_WRITE | REQ_DISCARD |
REQ_GET_READ_MIRRORS)) && mirror_num <= 1)
mirror_num = 1;
}
} else {
/*