For NOCOW and inline case, there will be no delayed_ref created for
them, so we should free their reserved data space at proper
time(finish_ordered_io for NOCOW and cow_file_inline for inline).
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
fs/btrfs/extent-tree.c | 7 ++++++-
fs/btrfs/inode.c | 15 +++++++++++++++
2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index ab1b1a1..ca15bd3 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4055,7 +4055,12 @@ int btrfs_check_data_free_space(struct inode *inode, u64
start, u64 len)
if (ret < 0)
return ret;
- /* Use new btrfs_qgroup_reserve_data to reserve precious data space */
+ /*
+ * Use new btrfs_qgroup_reserve_data to reserve precious data space
+ *
+ * TODO: Find a good method to avoid reserve data space for NOCOW
+ * range, but don't impact performance on quota disable case.
+ */
ret = btrfs_qgroup_reserve_data(inode, start, len);
return ret;
}
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 8c09197..9b783e6 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -310,6 +310,13 @@ static noinline int cow_file_range_inline(struct
btrfs_root *root,
btrfs_delalloc_release_metadata(inode, end + 1 - start);
btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0);
out:
+ /*
+ * Don't forget to free the reserved space, as for inlined extent
+ * it won't count as data extent, free them directly here.
+ * And at reserve time, it's always aligned to page size, so
+ * just free one page here.
+ */
+ btrfs_qgroup_free_data(inode, 0, PAGE_CACHE_SIZE);
btrfs_free_path(path);
btrfs_end_transaction(trans, root);
return ret;
@@ -2831,6 +2838,14 @@ static int btrfs_finish_ordered_io(struct
btrfs_ordered_extent *ordered_extent)
if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) {
BUG_ON(!list_empty(&ordered_extent->list)); /* Logic error */
+
+ /*
+ * For mwrite(mmap + memset to write) case, we still reserve
+ * space for NOCOW range.
+ * As NOCOW won't cause a new delayed ref, just free the space
+ */
+ btrfs_qgroup_free_data(inode, ordered_extent->file_offset,
+ ordered_extent->len);
btrfs_ordered_update_i_size(inode, 0, ordered_extent);
if (nolock)
trans = btrfs_join_transaction_nolock(root);
--
2.5.1
--
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