diff options
| -rw-r--r-- | fs/btrfs/extent-io-tree.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/fs/btrfs/extent-io-tree.c b/fs/btrfs/extent-io-tree.c index d0dd50f7d279..4ba916cb27ac 100644 --- a/fs/btrfs/extent-io-tree.c +++ b/fs/btrfs/extent-io-tree.c @@ -724,6 +724,45 @@ hit_next: * We need to split the extent, and clear the bit on the first half. */ if (state->start <= end && state->end > end) { + const u32 bits_to_clear = bits & ~EXTENT_CTLBITS; + + /* + * If all bits are cleared, there's no point in allocating or + * using the prealloc extent, split the state record, insert the + * prealloc record and then remove it. We can just adjust the + * start offset of the current state and avoid all that. + */ + if ((state->state & ~bits_to_clear) == 0) { + const u64 orig_end = state->end; + + if (tree->owner == IO_TREE_INODE_IO) + btrfs_split_delalloc_extent(tree->inode, state, end + 1); + + /* + * Temporarily adjust the end offset to match the + * removed subrange to update the changeset. + */ + state->end = end; + + ret = add_extent_changeset(state, bits_to_clear, changeset, 0); + if (unlikely(ret < 0)) { + extent_io_tree_panic(tree, state, + "add_extent_changeset", ret); + goto out; + } + ret = 0; + + if (tree->owner == IO_TREE_INODE_IO) + btrfs_clear_delalloc_extent(tree->inode, state, bits); + + state->start = end + 1; + state->end = orig_end; + + if (wake) + wake_up(&state->wq); + goto out; + } + prealloc = alloc_extent_state_atomic(prealloc); if (!prealloc) goto search_again; |