Btrfs: Allow large data extents in a single file to span into metadata block groups

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index d54ab8e..7405bd5 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -168,6 +168,7 @@ static u64 find_search_start(struct btrfs_root *root,
        u64 last;
        u64 start = 0;
        u64 end = 0;
+       u64 cache_miss = 0;
        int wrapped = 0;
 
 again:
@@ -181,14 +182,20 @@ again:
                ret = find_first_extent_bit(&root->fs_info->free_space_cache,
                                            last, &start, &end, EXTENT_DIRTY);
                if (ret) {
+                       if (!cache_miss)
+                               cache_miss = last;
                        goto new_group;
                }
 
                start = max(last, start);
                last = end + 1;
-               if (end + 1 - start < num)
+               if (last - start < num) {
+                       if (last == cache->key.objectid + cache->key.offset)
+                               cache_miss = start;
                        continue;
-               if (start + num >= cache->key.objectid + cache->key.offset)
+               }
+               if (data != BTRFS_BLOCK_GROUP_MIXED &&
+                   start + num >= cache->key.objectid + cache->key.offset)
                        goto new_group;
                return start;
        }
@@ -208,13 +215,22 @@ wrapped:
                }
                return search_start;
        }
+       if (cache_miss && !cache->cached) {
+               cache_block_group(root, cache);
+               last = cache_miss;
+
+               cache = btrfs_lookup_block_group(root->fs_info, last);
+       }
        cache = btrfs_find_block_group(root, cache, last, data, 0);
        *cache_ret = cache;
+       cache_miss = 0;
        goto again;
 }
 
 static u64 div_factor(u64 num, int factor)
 {
+       if (factor == 10)
+               return num;
        num *= factor;
        do_div(num, 10);
        return num;
@@ -247,9 +263,10 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
        if (!owner)
                factor = 8;
 
-       if (data == BTRFS_BLOCK_GROUP_MIXED)
+       if (data == BTRFS_BLOCK_GROUP_MIXED) {
                bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA;
-       else if (data)
+               factor = 10;
+       } else if (data)
                bit = BLOCK_GROUP_DATA;
        else
                bit = BLOCK_GROUP_METADATA;
@@ -918,6 +935,10 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 
        level = btrfs_header_level(root->node);
 
+       if (num_bytes >= 96 * 1024 * 1024 && hint_byte) {
+               data = BTRFS_BLOCK_GROUP_MIXED;
+       }
+
        if (search_end == (u64)-1)
                search_end = btrfs_super_total_bytes(&info->super_copy);
        if (hint_byte) {
@@ -937,6 +958,7 @@ check_failed:
        search_start = find_search_start(root, &block_group,
                                         search_start, total_needed, data);
        cached_start = search_start;
+
        btrfs_init_path(path);
        ins->objectid = search_start;
        ins->offset = 0;
@@ -1021,7 +1043,8 @@ check_failed:
                start_found = 1;
                last_byte = key.objectid + key.offset;
 
-               if (!full_scan && last_byte >= block_group->key.objectid +
+               if (!full_scan && data != BTRFS_BLOCK_GROUP_MIXED &&
+                   last_byte >= block_group->key.objectid +
                    block_group->key.offset) {
                        btrfs_release_path(root, path);
                        search_start = block_group->key.objectid +
@@ -1042,7 +1065,8 @@ check_pending:
        if (ins->objectid + num_bytes >= search_end)
                goto enospc;
 
-       if (!full_scan && ins->objectid + num_bytes >= block_group->
+       if (!full_scan && data != BTRFS_BLOCK_GROUP_MIXED &&
+           ins->objectid + num_bytes >= block_group->
            key.objectid + block_group->key.offset) {
                search_start = block_group->key.objectid +
                        block_group->key.offset;

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 5ceaed2..9dd2c5c 100644 (file)
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -439,6 +439,12 @@ next_slot:
                                                struct btrfs_file_extent_item);
                        found_type = btrfs_file_extent_type(leaf, extent);
                        if (found_type == BTRFS_FILE_EXTENT_REG) {
+                               extent_end =
+                                    btrfs_file_extent_disk_bytenr(leaf,
+                                                                  extent);
+                               if (extent_end)
+                                       *hint_byte = extent_end;
+
                                extent_end = key.offset +
                                     btrfs_file_extent_num_bytes(leaf, extent);
                                found_extent = 1;