[PATCH v3 1/3] btrfs: Always update fstrim_range on failure

[Luca Stefani <luca.stefani.ge1@gmail.com>]

Even in case of failure we could've discarded
some data and userspace should be made aware of it,
so copy fstrim_range to userspace regardless.

Also make sure to update the trimmed bytes amount
even if btrfs_trim_free_extents fails.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
---
 fs/btrfs/extent-tree.c | 4 ++--
 fs/btrfs/ioctl.c       | 4 +---
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index feec49e6f9c8..a5966324607d 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6551,13 +6551,13 @@ int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range)
 			continue;
 
 		ret = btrfs_trim_free_extents(device, &group_trimmed);
+
+		trimmed += group_trimmed;
 		if (ret) {
 			dev_failed++;
 			dev_ret = ret;
 			break;
 		}
-
-		trimmed += group_trimmed;
 	}
 	mutex_unlock(&fs_devices->device_list_mutex);
 
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index e0a664b8a46a..94d8f29b04c5 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -543,13 +543,11 @@ static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
 
 	range.minlen = max(range.minlen, minlen);
 	ret = btrfs_trim_fs(fs_info, &range);
-	if (ret < 0)
-		return ret;
 
 	if (copy_to_user(arg, &range, sizeof(range)))
 		return -EFAULT;
 
-	return 0;
+	return ret;
 }
 
 int __pure btrfs_is_empty_uuid(const u8 *uuid)
-- 
2.46.0