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Diffstat (limited to 'fs/btrfs/extent-tree.c')
-rw-r--r--fs/btrfs/extent-tree.c57
1 files changed, 56 insertions, 1 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 7500728bcdd3..1ebac1982a9c 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -11249,6 +11249,54 @@ int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
return unpin_extent_range(fs_info, start, end, false);
}
+static bool should_skip_trim(struct btrfs_device *device, u64 *start, u64 *len)
+{
+ u64 trimmed_start = 0, trimmed_end = 0;
+ u64 end = *start + *len - 1;
+
+ if (!find_first_extent_bit(&device->alloc_state, *start, &trimmed_start,
+ &trimmed_end, CHUNK_TRIMMED, NULL)) {
+ u64 trimmed_len = trimmed_end - trimmed_start + 1;
+
+ if (*start < trimmed_start) {
+ if (in_range(end, trimmed_start, trimmed_len) ||
+ end > trimmed_end) {
+ /*
+ * start|------|end
+ * ts|--|trimmed_len
+ * OR
+ * start|-----|end
+ * ts|-----|trimmed_len
+ */
+ *len = trimmed_start - *start;
+ return false;
+ } else if (end < trimmed_start) {
+ /*
+ * start|------|end
+ * ts|--|trimmed_len
+ */
+ return false;
+ }
+ } else if (in_range(*start, trimmed_start, trimmed_len)) {
+ if (in_range(end, trimmed_start, trimmed_len)) {
+ /*
+ * start|------|end
+ * ts|----------|trimmed_len
+ */
+ return true;
+ } else {
+ /*
+ * start|-----------|end
+ * ts|----------|trimmed_len
+ */
+ *start = trimmed_end + 1;
+ *len = end - *start + 1;
+ return false;
+ }
+ }
+ }
+ return false;
+}
/*
* It used to be that old block groups would be left around forever.
* Iterating over them would be enough to trim unused space. Since we
@@ -11319,7 +11367,14 @@ static int btrfs_trim_free_extents(struct btrfs_device *device,
start = max(range->start, start);
len = min(range->len, len);
- ret = btrfs_issue_discard(device->bdev, start, len, &bytes);
+ if (!should_skip_trim(device, &start, &len)) {
+ ret = btrfs_issue_discard(device->bdev, start, len,
+ &bytes);
+ if (!ret)
+ set_extent_bits(&device->alloc_state, start,
+ start + bytes - 1,
+ CHUNK_TRIMMED);
+ }
mutex_unlock(&fs_info->chunk_mutex);
if (ret)