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btrfs: use raid_attr to adjust minimal stripe size in btrfs_calc_avail_data_space

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Special case for DUP can be replaced by lookup to the attribute table,
where the dev_stripes is the right coefficient.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-06-18 20:00:11 +02:00
parent f262fa8de6
commit 4f080f5711
1 changed files with 5 additions and 4 deletions
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9
fs/btrfs/super.c
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@ -1904,6 +1904,7 @@ static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info,
u64 min_stripe_size;
int min_stripes = 1, num_stripes = 1;
int i = 0, nr_devices;
const struct btrfs_raid_attr *rattr;
/*
* We aren't under the device list lock, so this is racy-ish, but good
@ -1927,6 +1928,8 @@ static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info,
/* calc min stripe number for data space allocation */
type = btrfs_data_alloc_profile(fs_info);
rattr = &btrfs_raid_array[btrfs_bg_flags_to_raid_index(type)];
if (type & BTRFS_BLOCK_GROUP_RAID0) {
min_stripes = 2;
num_stripes = nr_devices;
@ -1938,10 +1941,8 @@ static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info,
num_stripes = 4;
}
if (type & BTRFS_BLOCK_GROUP_DUP)
min_stripe_size = 2 * BTRFS_STRIPE_LEN;
else
min_stripe_size = BTRFS_STRIPE_LEN;
/* Adjust for more than 1 stripe per device */
min_stripe_size = rattr->dev_stripes * BTRFS_STRIPE_LEN;
rcu_read_lock();
list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {