btrfs: preallocate path for snapshot creation at ioctl time
We can also preallocate btrfs_path that's used during pending snapshot
creation and avoid another late ENOMEM failure.
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 27fc660..3d9b27d 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -661,7 +661,8 @@
pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
GFP_NOFS);
- if (!pending_snapshot->root_item) {
+ pending_snapshot->path = btrfs_alloc_path();
+ if (!pending_snapshot->root_item || !pending_snapshot->path) {
ret = -ENOMEM;
goto free_pending;
}
@@ -747,6 +748,7 @@
wake_up_atomic_t(&root->will_be_snapshoted);
free_pending:
kfree(pending_snapshot->root_item);
+ btrfs_free_path(pending_snapshot->path);
kfree(pending_snapshot);
return ret;
