Btrfs: helper for ops that requires full stripe

This adds a helper to show directly whether ops require full stripe.

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>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 8cc4026..259bd21 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5627,6 +5627,11 @@ static void handle_ops_on_dev_replace(enum btrfs_map_op op,
        *bbio_ret = bbio;
 }
 
+static bool need_full_stripe(enum btrfs_map_op op)
+{
+       return (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS);
+}
+
 static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
                             enum btrfs_map_op op,
                             u64 logical, u64 *length,
@@ -5729,8 +5734,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
                btrfs_dev_replace_set_lock_blocking(dev_replace);
 
        if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 &&
-           op != BTRFS_MAP_WRITE && op != BTRFS_MAP_GET_READ_MIRRORS &&
-           dev_replace->tgtdev != NULL) {
+           !need_full_stripe(op) && dev_replace->tgtdev != NULL) {
                ret = get_extra_mirror_from_replace(fs_info, logical, *length,
                                                    dev_replace->srcdev->devid,
                                                    &mirror_num,
@@ -5863,10 +5867,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
                bbio->tgtdev_map = (int *)(bbio->stripes + num_alloc_stripes);
 
        /* build raid_map */
-       if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK &&
-           need_raid_map &&
-           ((op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS) ||
-           mirror_num > 1)) {
+       if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK && need_raid_map &&
+           (need_full_stripe(op) || mirror_num > 1)) {
                u64 tmp;
                unsigned rot;
 
@@ -5901,14 +5903,14 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
                stripe_index++;
        }
 
-       if (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS)
+       if (need_full_stripe(op))
                max_errors = btrfs_chunk_max_errors(map);
 
        if (bbio->raid_map)
                sort_parity_stripes(bbio, num_stripes);
 
        if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL &&
-           (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS)) {
+           need_full_stripe(op)) {
                handle_ops_on_dev_replace(op, &bbio, dev_replace, &num_stripes,
                                          &max_errors);
        }