diff options
Diffstat (limited to 'fs/btrfs/delalloc-space.c')
| -rw-r--r-- | fs/btrfs/delalloc-space.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/fs/btrfs/delalloc-space.c b/fs/btrfs/delalloc-space.c index 88e900e5a43d..1479be2427cb 100644 --- a/fs/btrfs/delalloc-space.c +++ b/fs/btrfs/delalloc-space.c @@ -439,6 +439,29 @@ void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes) btrfs_inode_rsv_release(inode, true); } +/* Shrink a previously reserved extent to a new length. */ +void btrfs_delalloc_shrink_extents(struct btrfs_inode *inode, u64 reserved_len, u64 new_len) +{ + struct btrfs_fs_info *fs_info = inode->root->fs_info; + const u32 reserved_num_extents = count_max_extents(fs_info, reserved_len); + const u32 new_num_extents = count_max_extents(fs_info, new_len); + const int diff_num_extents = new_num_extents - reserved_num_extents; + + ASSERT(new_len <= reserved_len); + if (new_num_extents == reserved_num_extents) + return; + + spin_lock(&inode->lock); + btrfs_mod_outstanding_extents(inode, diff_num_extents); + btrfs_calculate_inode_block_rsv_size(fs_info, inode); + spin_unlock(&inode->lock); + + if (btrfs_is_testing(fs_info)) + return; + + btrfs_inode_rsv_release(inode, true); +} + /* * Reserve data and metadata space for delalloc * |