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Btrfs: do not add extra mirror when dev_replace target dev is not available

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With this, we can avoid allocating memory for dev replace copies if the
target dev is not available.

Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2017-03-14 13:33:59 -07:00 committed by David Sterba
parent 73c0f22825
commit 6fad823f49
1 changed files with 4 additions and 3 deletions
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7
fs/btrfs/volumes.c
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@ -5157,7 +5157,8 @@ int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
free_extent_map(em);
btrfs_dev_replace_lock(&fs_info->dev_replace, 0);
if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))
if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace) &&
fs_info->dev_replace.tgtdev)
ret++;
btrfs_dev_replace_unlock(&fs_info->dev_replace, 0);
@ -5845,7 +5846,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
}
num_alloc_stripes = num_stripes;
if (dev_replace_is_ongoing) {
if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL) {
if (op == BTRFS_MAP_WRITE)
num_alloc_stripes <<= 1;
if (op == BTRFS_MAP_GET_READ_MIRRORS)
@ -5858,7 +5859,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
ret = -ENOMEM;
goto out;
}
if (dev_replace_is_ongoing)
if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL)
bbio->tgtdev_map = (int *)(bbio->stripes + num_alloc_stripes);
/* build raid_map */