btrfs: update btrfs_space_info's bytes_may_use timely

[cascardo/linux.git] / fs / btrfs / relocation.c

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 71b4b70..8a2c2a0 100644 (file)
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -3040,6 +3040,7 @@ int prealloc_file_extent_cluster(struct inode *inode,
        int ret = 0;
        u64 prealloc_start = cluster->start - offset;
        u64 prealloc_end = cluster->end - offset;
+       u64 cur_offset;
 
        BUG_ON(cluster->start != cluster->boundary[0]);
        inode_lock(inode);
@@ -3049,6 +3050,7 @@ int prealloc_file_extent_cluster(struct inode *inode,
        if (ret)
                goto out;
 
+       cur_offset = prealloc_start;
        while (nr < cluster->nr) {
                start = cluster->boundary[nr] - offset;
                if (nr + 1 < cluster->nr)
@@ -3058,16 +3060,21 @@ int prealloc_file_extent_cluster(struct inode *inode,
 
                lock_extent(&BTRFS_I(inode)->io_tree, start, end);
                num_bytes = end + 1 - start;
+               if (cur_offset < start)
+                       btrfs_free_reserved_data_space(inode, cur_offset,
+                                       start - cur_offset);
                ret = btrfs_prealloc_file_range(inode, 0, start,
                                                num_bytes, num_bytes,
                                                end + 1, &alloc_hint);
+               cur_offset = end + 1;
                unlock_extent(&BTRFS_I(inode)->io_tree, start, end);
                if (ret)
                        break;
                nr++;
        }
-       btrfs_free_reserved_data_space(inode, prealloc_start,
-                                      prealloc_end + 1 - prealloc_start);
+       if (cur_offset < prealloc_end)
+               btrfs_free_reserved_data_space(inode, cur_offset,
+                                      prealloc_end + 1 - cur_offset);
 out:
        inode_unlock(inode);
        return ret;