diff --git a/Documentation/RelNotes/2.56.0.adoc b/Documentation/RelNotes/2.56.0.adoc
index d33dd57996a486..65f0d965633959 100644
--- a/Documentation/RelNotes/2.56.0.adoc
+++ b/Documentation/RelNotes/2.56.0.adoc
@@ -121,6 +121,11 @@ UI, Workflows & Features
    code did not check the presence of a value and instead segfaulted
    without one, which has been corrected.
 
+ * 'git repack' has been taught '--drop-filtered' to delete local
+   promisor blobs exceeding a limit (currently 'blob:limit=') in partial
+   clones, reclaiming space.  Guards prevent running during other
+   operations or if referenced by the index.
+
 
 Performance, Internal Implementation, Development Support etc.
 --------------------------------------------------------------
@@ -419,6 +424,16 @@ Performance, Internal Implementation, Development Support etc.
  * The setting of a now-unused member '.pretty_given' in the sequencer
    machinery has been removed.
 
+ * The performance of adding numerous new packfiles has been improved
+   by introducing a fast path for known-new packfiles to skip an
+   unnecessary traversal in packfile_list_append(), avoiding a
+   quadratic complexity regression on load.
+
+ * The unused name parameter in 'struct chdir_notify_entry' has been
+   removed from chdir_notify_register(), chdir_notify_unregister(), and
+   related callback signatures across several subsystems, simplifying the
+   API now that trace output no longer uses it.
+
 
 Fixes since v2.55
 -----------------
@@ -669,3 +684,14 @@ Fixes since v2.55
 
  * The help text for the '-l' option of 'git diff' has been updated.
    (merge 764243bdf4 en/diff-l-opt-help later to maint).
+
+ * 'git -C <dir> diff fi<TAB>' did not complete 'file', which has
+   been corrected.
+   (merge 354d1bf3a0 jc/complete-diff-tracked-paths later to maint).
+
+ * 'git -C <dir> checkout fi<TAB>' did not complete 'file', which has
+   been corrected.
+   (merge 05e2ab1f31 jc/complete-checkout later to maint).
+
+ * Other code cleanup, docfix, build fix, etc.
+   (merge 026636128f ss/submittingpatches-typofix later to maint).
diff --git a/Documentation/SubmittingPatches b/Documentation/SubmittingPatches
index c269e474e3f2bf..c60855f7069492 100644
--- a/Documentation/SubmittingPatches
+++ b/Documentation/SubmittingPatches
@@ -117,7 +117,7 @@ of review.
   can still continue to further improve them by adding more patches on
   top, but by the time a topic gets merged to 'next', it is expected
   that everybody agrees that the scope and the basic direction of the
-  topic are appropriate, so such an incremental updates are limited to
+  topic are appropriate, so such incremental updates are limited to
   small corrections and polishing.  After a topic cooks for some time
   (like 7 calendar days) in 'next' without needing further tweaks on
   top, it gets merged to the 'master' branch and waits to become part
diff --git a/Documentation/git-repack.adoc b/Documentation/git-repack.adoc
index 72c42015e23f94..a1f9e64f668750 100644
--- a/Documentation/git-repack.adoc
+++ b/Documentation/git-repack.adoc
@@ -12,6 +12,7 @@ SYNOPSIS
 'git repack' [-a] [-A] [-d] [-f] [-F] [-l] [-n] [-q] [-b] [-m]
 	[--window=<n>] [--depth=<n>] [--threads=<n>] [--keep-pack=<pack-name>]
 	[--write-midx[=<mode>]] [--name-hash-version=<n>] [--path-walk]
+	[--filter=<filter-spec>] [--drop-filtered [--dry-run]]
 
 DESCRIPTION
 -----------
@@ -182,6 +183,42 @@ depth is 4095.
 	`objects` and `objects/info/alternates` sections of
 	linkgit:gitrepository-layout[5].
 
+--drop-filtered::
+	Delete the local objects that match the `--filter` specification
+	instead of keeping them in a separate packfile, reclaiming the
+	disk space they occupy. This is intended for partial clones,
+	where the filtered objects are promisor objects that remain
+	recoverable from the promisor remote and are lazily re-fetched
+	on demand when they are next needed.
++
+Only large blobs are supported for now, so `--filter=blob:limit=<n>`
+is currently the only accepted filter. Because dropped objects must be
+recoverable, this option requires a promisor remote to be configured
+and refuses to run otherwise.
++
+This option requires `-a`, and implies `-d`: the objects are dropped by
+rebuilding the promisor pack without them and then removing the now
+redundant old packs, so the redundant packs must be deleted for the
+space to actually be reclaimed. It is incompatible with `--filter-to`
+and with bitmap writing (`-b`/`--write-bitmap-index`), since filtering
+breaks the single-pack closure that bitmaps require. A bitmap setting
+coming from configuration is silently disabled for the duration of the
+command.
++
+As a convenience, since dropped objects remain recoverable by lazy fetch,
+`--drop-filtered` refuses to run while another operation
+(merge, rebase, am, cherry-pick, revert, or bisect) is in progress, to
+avoid a surprising network fetch mid-operation, and refuses to drop any
+blob that the current index references, since such a blob would only be
+lazily re-fetched by the next command that inspects the working tree.
+These checks are skipped in bare repositories, which have neither a
+working tree nor an index.
+
+--dry-run::
+	Only meaningful with `--drop-filtered`. List the objects that
+	would be dropped, one object ID per line, without rebuilding any
+	pack or deleting anything.
+
 -b::
 --write-bitmap-index::
 	Write a reachability bitmap index as part of the repack. This
diff --git a/builtin/repack.c b/builtin/repack.c
index db504d673fcf52..c4360382c1fce2 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -14,6 +14,11 @@
 #include "promisor-remote.h"
 #include "repack.h"
 #include "shallow.h"
+#include "list-objects-filter-options.h"
+#include "oidset.h"
+#include "hex.h"
+#include "wt-status.h"
+#include "read-cache-ll.h"
 
 #define ALL_INTO_ONE 1
 #define LOOSEN_UNREACHABLE 2
@@ -28,11 +33,15 @@ static int use_delta_islands;
 static int run_update_server_info = 1;
 static char *packdir, *packtmp_name, *packtmp;
 static int midx_must_contain_cruft = 1;
+static int drop_filtered;
+static int dry_run;
+static int write_bitmaps_given;
 
 static const char *const git_repack_usage[] = {
 	N_("git repack [-a] [-A] [-d] [-f] [-F] [-l] [-n] [-q] [-b] [-m]\n"
 	   "[--window=<n>] [--depth=<n>] [--threads=<n>] [--keep-pack=<pack-name>]\n"
-	   "[--write-midx[=<mode>]] [--name-hash-version=<n>] [--path-walk]"),
+	   "[--write-midx[=<mode>]] [--name-hash-version=<n>] [--path-walk]\n"
+	   "[--filter=<filter-spec>] [--drop-filtered [--dry-run]]"),
 	NULL
 };
 
@@ -111,6 +120,21 @@ static int repack_config(const char *var, const char *value,
 	return git_default_config(var, value, ctx, cb);
 }
 
+static int option_parse_write_bitmaps(const struct option *opt, const char *arg,
+				      int unset)
+{
+	int *value = opt->value;
+
+	BUG_ON_OPT_ARG(arg);
+	if (unset)
+		*value = 0;
+	else
+		*value = 1;
+
+	write_bitmaps_given = 1;
+	return 0;
+}
+
 static int option_parse_write_midx(const struct option *opt, const char *arg,
 				   int unset)
 {
@@ -140,6 +164,7 @@ int cmd_repack(int argc,
 	struct string_list_item *item;
 	struct string_list names = STRING_LIST_INIT_DUP;
 	struct existing_packs existing = EXISTING_PACKS_INIT;
+	struct oidset drop_oids = OIDSET_INIT;
 	struct pack_geometry geometry = { 0 };
 	struct tempfile *refs_snapshot = NULL;
 	int i, ret;
@@ -194,8 +219,9 @@ int cmd_repack(int argc,
 		OPT__QUIET(&po_args.quiet, N_("be quiet")),
 		OPT_BOOL('l', "local", &po_args.local,
 				N_("pass --local to git-pack-objects")),
-		OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
-				N_("write bitmap index")),
+		OPT_CALLBACK_F('b', "write-bitmap-index", &write_bitmaps, NULL,
+				N_("write bitmap index"),
+				PARSE_OPT_NOARG, option_parse_write_bitmaps),
 		OPT_BOOL('i', "delta-islands", &use_delta_islands,
 				N_("pass --delta-islands to git-pack-objects")),
 		OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
@@ -231,6 +257,10 @@ int cmd_repack(int argc,
 			   N_("pack prefix to store a pack containing pruned objects")),
 		OPT_STRING(0, "filter-to", &filter_to, N_("dir"),
 			   N_("pack prefix to store a pack containing filtered out objects")),
+		OPT_BOOL(0, "drop-filtered", &drop_filtered,
+				N_("delete filtered out objects (requires --filter)")),
+		OPT_BOOL(0, "dry-run", &dry_run,
+				N_("only show which objects would be dropped")),
 		OPT_END()
 	};
 
@@ -252,6 +282,118 @@ int cmd_repack(int argc,
 	po_args.depth = xstrdup_or_null(opt_depth);
 	po_args.threads = xstrdup_or_null(opt_threads);
 
+	die_for_incompatible_opt2(drop_filtered, "--drop-filtered",
+		!!filter_to, "--filter-to");
+
+	if (dry_run && !drop_filtered)
+		die(_("--dry-run only takes effect with --drop-filtered"));
+
+	if (drop_filtered) {
+		if (!po_args.filter_options.choice)
+			die(_("--drop-filtered requires --filter"));
+
+		if (!(pack_everything & ALL_INTO_ONE))
+			die(_("--drop-filtered requires -a"));
+
+		/*
+		 * Only blob:limit=<n> is supported for now. Reject other
+		 * filter choices early, before walking the object database.
+		 */
+		if (po_args.filter_options.choice != LOFC_BLOB_LIMIT)
+			die(_("--drop-filtered only supports --filter=blob:limit=<n> for now"));
+
+		/*
+		 * An explicit -b on the command line is a conflict we have to
+		 * report; a bitmap setting from config is silently overridden
+		 * for the duration of the command.
+		 */
+		if (write_bitmaps_given && write_bitmaps > 0)
+			die(_("options '%s' and '%s' cannot be used together"),
+				"--drop-filtered", "--write-bitmap-index");
+
+		/*
+		 * Without a promisor remote there is nowhere to re-fetch the
+		 * dropped objects from, so dropping them would be permanent
+		 * data loss.
+		 */
+		if (!repo_has_promisor_remote(repo))
+			die(_("--drop-filtered requires a promisor remote"));
+
+		/*
+		 * Refuse to run while another operation is in progress. A
+		 * dropped object would just be lazily re-fetched when the
+		 * operation resumes, but triggering a network fetch in the
+		 * middle of a half-finished
+		 * merge/rebase/cherry-pick/revert/bisect is a poor
+		 * experience, so this is a UX convenience rather than a
+		 * safety measure. Bare repositories have no such state, so
+		 * the check is skipped there.
+		 */
+		if (!is_bare_repository(repo)) {
+			struct wt_status_state state = { 0 };
+
+			wt_status_get_state(repo, &state, 0);
+			if (state.merge_in_progress || state.revert_in_progress ||
+			    state.rebase_in_progress || state.bisect_in_progress ||
+			    state.cherry_pick_in_progress || state.am_in_progress ||
+			    state.rebase_interactive_in_progress) {
+				wt_status_state_free_buffers(&state);
+				die(_("--drop-filtered cannot be used while "
+				      "another operation (merge, rebase, am, "
+				      "cherry-pick, revert, or bisect) is in "
+				      "progress"));
+			}
+			wt_status_state_free_buffers(&state);
+		}
+
+		write_bitmaps = 0;
+
+		/*
+		 * Dropping objects means rebuilding the promisor packs
+		 * without them and then removing the old packs, so the
+		 * redundant packs must be deleted. Imply -d on a real run.
+		 */
+		if (!dry_run)
+			delete_redundant = 1;
+
+		ret = enumerate_promisor_blobs(repo, &po_args.filter_options, &drop_oids);
+
+		if (ret)
+			goto cleanup;
+
+		/*
+		 * Refuse to drop blobs that the current index references.
+		 * Such a blob would only be lazily re-fetched by the next
+		 * command that touches the worktree, so dropping it reclaims
+		 * nothing. This guard just avoids that churn. Bare
+		 * repositories have no index, so the check is skipped there.
+		 */
+		if (!is_bare_repository(repo) && oidset_size(&drop_oids)) {
+			struct index_state *istate = repo->index;
+			unsigned int i;
+
+			if (repo_read_index(repo) < 0)
+				die(_("could not read the index"));
+
+			for (i = 0; i < istate->cache_nr; i++) {
+				const struct cache_entry *ce = istate->cache[i];
+
+				if (oidset_contains(&drop_oids, &ce->oid))
+					die(_("cannot drop '%s' (%s): it is referenced by the current index"),
+						ce->name, oid_to_hex(&ce->oid));
+			}
+		}
+
+		if (dry_run) {
+			struct oidset_iter iter;
+			const struct object_id *oid;
+
+			oidset_iter_init(&drop_oids, &iter);
+			while ((oid = oidset_iter_next(&iter)))
+				printf("%s\n", oid_to_hex(oid));
+		}
+	}
+
 	if (delete_redundant && repo->repository_format_precious_objects)
 		die(_("cannot delete packs in a precious-objects repo"));
 
@@ -362,7 +504,8 @@ int cmd_repack(int argc,
 		strvec_push(&cmd.args, "--delta-islands");
 
 	if (pack_everything & ALL_INTO_ONE) {
-		repack_promisor_objects(repo, &po_args, &names, packtmp);
+		repack_promisor_objects(repo, &po_args, &names, packtmp,
+			(drop_filtered && !dry_run) ? &drop_oids : NULL);
 
 		if (existing_packs_has_non_kept(&existing) &&
 		    delete_redundant &&
@@ -545,7 +688,7 @@ int cmd_repack(int argc,
 		}
 	}
 
-	if (po_args.filter_options.choice) {
+	if (po_args.filter_options.choice && !drop_filtered) {
 		struct write_pack_opts opts = {
 			.po_args = &po_args,
 			.destination = filter_to,
@@ -638,6 +781,7 @@ int cmd_repack(int argc,
 cleanup:
 	string_list_clear(&keep_pack_list, 0);
 	string_list_clear(&names, 1);
+	oidset_clear(&drop_oids);
 	existing_packs_release(&existing);
 	pack_geometry_release(&geometry);
 	pack_objects_args_release(&po_args);
diff --git a/chdir-notify.c b/chdir-notify.c
index 1237a45e2e6492..55773c24c96eda 100644
--- a/chdir-notify.c
+++ b/chdir-notify.c
@@ -7,25 +7,22 @@
 #include "trace.h"
 
 struct chdir_notify_entry {
-	const char *name;
 	chdir_notify_callback cb;
 	void *data;
 	struct list_head list;
 };
 static LIST_HEAD(chdir_notify_entries);
 
-void chdir_notify_register(const char *name,
-			   chdir_notify_callback cb,
+void chdir_notify_register(chdir_notify_callback cb,
 			   void *data)
 {
 	struct chdir_notify_entry *e = xmalloc(sizeof(*e));
-	e->name = name;
 	e->cb = cb;
 	e->data = data;
 	list_add_tail(&e->list, &chdir_notify_entries);
 }
 
-void chdir_notify_unregister(const char *name, chdir_notify_callback cb,
+void chdir_notify_unregister(chdir_notify_callback cb,
 			     void *data)
 {
 	struct list_head *pos, *p;
@@ -34,8 +31,7 @@ void chdir_notify_unregister(const char *name, chdir_notify_callback cb,
 		struct chdir_notify_entry *e =
 			list_entry(pos, struct chdir_notify_entry, list);
 
-		if (e->cb != cb || e->data != data || !e->name != !name ||
-		    (e->name && strcmp(e->name, name)))
+		if (e->cb != cb || e->data != data)
 			continue;
 
 		list_del(pos);
@@ -64,7 +60,7 @@ int chdir_notify(const char *new_cwd)
 	list_for_each(pos, &chdir_notify_entries) {
 		struct chdir_notify_entry *e =
 			list_entry(pos, struct chdir_notify_entry, list);
-		e->cb(e->name, old_cwd.buf, new_cwd, e->data);
+		e->cb(old_cwd.buf, new_cwd, e->data);
 	}
 
 	strbuf_release(&old_cwd);
diff --git a/chdir-notify.h b/chdir-notify.h
index 36b4114472e31d..e4ae38e12dd8b9 100644
--- a/chdir-notify.h
+++ b/chdir-notify.h
@@ -33,13 +33,11 @@
  * $GIT_TRACE_SETUP. It may be NULL, but if non-NULL should point to
  * storage which lasts as long as the registration is active.
  */
-typedef void (*chdir_notify_callback)(const char *name,
-				      const char *old_cwd,
+typedef void (*chdir_notify_callback)(const char *old_cwd,
 				      const char *new_cwd,
 				      void *data);
-void chdir_notify_register(const char *name, chdir_notify_callback cb, void *data);
-void chdir_notify_unregister(const char *name, chdir_notify_callback cb,
-			     void *data);
+void chdir_notify_register(chdir_notify_callback cb, void *data);
+void chdir_notify_unregister(chdir_notify_callback cb, void *data);
 
 /*
  *
diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index e8757877104eb9..e6dce62d3c3fb4 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -1735,49 +1735,59 @@ __git_checkout_default_dwim_mode ()
 
 _git_checkout ()
 {
-	__git_has_doubledash && return
+	if ! __git_has_doubledash; then
+		local dwim_opt="$(__git_checkout_default_dwim_mode)"
 
-	local dwim_opt="$(__git_checkout_default_dwim_mode)"
+		case "$prev" in
+		-b|-B|--orphan)
+			# Complete local branches (and DWIM branch
+			# remote branch names) for an option argument
+			# specifying a new branch name. This is for
+			# convenience, assuming new branches are
+			# possibly based on pre-existing branch names.
+			__git_complete_refs $dwim_opt --mode="heads"
+			return
+			;;
+		*)
+			;;
+		esac
 
-	case "$prev" in
-	-b|-B|--orphan)
-		# Complete local branches (and DWIM branch
-		# remote branch names) for an option argument
-		# specifying a new branch name. This is for
-		# convenience, assuming new branches are
-		# possibly based on pre-existing branch names.
-		__git_complete_refs $dwim_opt --mode="heads"
-		return
-		;;
-	*)
-		;;
-	esac
+		case "$cur" in
+		--conflict=*)
+			__gitcomp "diff3 merge zdiff3" "" "${cur##--conflict=}"
+			return
+			;;
+		--*)
+			__gitcomp_builtin checkout
+			return
+			;;
+		*)
+			# At this point, we've already handled special completion for
+			# the arguments to -b/-B, and --orphan. There are 3 main
+			# things left we can possibly complete:
+			# 1) a start-point for -b/-B, -d/--detach, or --orphan
+			# 2) a remote head, for --track
+			# 3) an arbitrary reference, possibly including DWIM names
+			#
+
+			if [ -n "$(__git_find_on_cmdline "-b -B -d --detach --orphan")" ]; then
+				__git_complete_refs --mode="refs"
+			elif [ -n "$(__git_find_on_cmdline "-t --track")" ]; then
+				__git_complete_refs --mode="remote-heads"
+			else
+				__git_complete_refs $dwim_opt --mode="refs"
+			fi
+			;;
+		esac
+	fi
 
-	case "$cur" in
-	--conflict=*)
-		__gitcomp "diff3 merge zdiff3" "" "${cur##--conflict=}"
-		;;
-	--*)
-		__gitcomp_builtin checkout
-		;;
-	*)
-		# At this point, we've already handled special completion for
-		# the arguments to -b/-B, and --orphan. There are 3 main
-		# things left we can possibly complete:
-		# 1) a start-point for -b/-B, -d/--detach, or --orphan
-		# 2) a remote head, for --track
-		# 3) an arbitrary reference, possibly including DWIM names
-		#
+	if [ ${#COMPREPLY[@]} -eq 0 ]; then
+		__git_complete_index_file ""
+	fi
 
-		if [ -n "$(__git_find_on_cmdline "-b -B -d --detach --orphan")" ]; then
-			__git_complete_refs --mode="refs"
-		elif [ -n "$(__git_find_on_cmdline "-t --track")" ]; then
-			__git_complete_refs --mode="remote-heads"
-		else
-			__git_complete_refs $dwim_opt --mode="refs"
-		fi
-		;;
-	esac
+	if [ ${#COMPREPLY[@]} -eq 0 ]; then
+		__git_complete_index_file "--others --directory"
+	fi
 }
 
 __git_sequencer_inprogress_options="--continue --quit --abort --skip"
@@ -1947,35 +1957,48 @@ __git_diff_difftool_options="--cached --staged
 
 _git_diff ()
 {
-	__git_has_doubledash && return
+	if ! __git_has_doubledash; then
+		case "$cur" in
+		--diff-algorithm=*)
+			__gitcomp "$__git_diff_algorithms" \
+				"" "${cur##--diff-algorithm=}"
+			return
+			;;
+		--submodule=*)
+			__gitcomp "$__git_diff_submodule_formats" \
+				"" "${cur##--submodule=}"
+			return
+			;;
+		--color-moved=*)
+			__gitcomp "$__git_color_moved_opts" \
+				"" "${cur##--color-moved=}"
+			return
+			;;
+		--color-moved-ws=*)
+			__gitcomp "$__git_color_moved_ws_opts" \
+				"" "${cur##--color-moved-ws=}"
+			return
+			;;
+		--ws-error-highlight=*)
+			__gitcomp "$__git_ws_error_highlight_opts" \
+				"" "${cur##--ws-error-highlight=}"
+			return
+			;;
+		--*)
+			__gitcomp "$__git_diff_difftool_options"
+			return
+			;;
+		esac
+		__git_complete_revlist_file
+	fi
 
-	case "$cur" in
-	--diff-algorithm=*)
-		__gitcomp "$__git_diff_algorithms" "" "${cur##--diff-algorithm=}"
-		return
-		;;
-	--submodule=*)
-		__gitcomp "$__git_diff_submodule_formats" "" "${cur##--submodule=}"
-		return
-		;;
-	--color-moved=*)
-		__gitcomp "$__git_color_moved_opts" "" "${cur##--color-moved=}"
-		return
-		;;
-	--color-moved-ws=*)
-		__gitcomp "$__git_color_moved_ws_opts" "" "${cur##--color-moved-ws=}"
-		return
-		;;
-	--ws-error-highlight=*)
-		__gitcomp "$__git_ws_error_highlight_opts" "" "${cur##--ws-error-highlight=}"
-		return
-		;;
-	--*)
-		__gitcomp "$__git_diff_difftool_options"
-		return
-		;;
-	esac
-	__git_complete_revlist_file
+	if [ ${#COMPREPLY[@]} -eq 0 ]; then
+		__git_complete_index_file ""
+	fi
+
+	if [ ${#COMPREPLY[@]} -eq 0 ]; then
+		__git_complete_index_file "--others --directory"
+	fi
 }
 
 __git_mergetools_common="diffuse diffmerge ecmerge emerge kdiff3 meld opendiff
diff --git a/list-objects-filter.c b/list-objects-filter.c
index c912ff3079a7d7..10e44f135780ba 100644
--- a/list-objects-filter.c
+++ b/list-objects-filter.c
@@ -828,3 +828,48 @@ void list_objects_filter__free(struct filter *filter)
 	filter->free_fn(filter->filter_data);
 	free(filter);
 }
+
+/*
+ * NEEDSWORK: this reimplements the blob:limit size check rather than
+ * reusing the existing filter machinery in
+ * list_objects_filter__filter_object(). That machinery is currently
+ * tied to the object-walk path and cannot easily be driven from a
+ * plain oidset. It would be nice to refactor the filter code so this
+ * helper can reuse it instead of duplicating the size check.
+ */
+int list_objects_filter__filter_oidset(struct repository *r,
+	const struct list_objects_filter_options *opts,
+	const struct oidset *in,
+	struct oidset *omitted)
+{
+	struct oidset_iter iter;
+	const struct object_id *oid;
+
+	if (opts->choice != LOFC_BLOB_LIMIT)
+		return error(_("filter_oidset: only blob:limit filters are supported"));
+
+	oidset_iter_init(in, &iter);
+	while ((oid = oidset_iter_next(&iter))) {
+		struct object_info info = OBJECT_INFO_INIT;
+		enum object_type type;
+		size_t size;
+
+		info.typep = &type;
+		info.sizep = &size;
+
+		/*
+		 * Use OBJECT_INFO_SKIP_FETCH_OBJECT to avoid triggering
+		 * a lazy fetch while inspecting candidates for removal.
+		 */
+		if (odb_read_object_info_extended(r->objects, oid, &info,
+				OBJECT_INFO_SKIP_FETCH_OBJECT) < 0)
+			continue;
+
+		if (type != OBJ_BLOB)
+			continue;
+
+		if (size >= opts->blob_limit_value)
+			oidset_insert(omitted, oid);
+	}
+	return 0;
+}
diff --git a/list-objects-filter.h b/list-objects-filter.h
index 9e98814111cee4..5207ab70a9188e 100644
--- a/list-objects-filter.h
+++ b/list-objects-filter.h
@@ -94,4 +94,20 @@ enum list_objects_filter_result list_objects_filter__filter_object(
  */
 void list_objects_filter__free(struct filter *filter);
 
+/*
+ * Given a set of OIDs in 'in', populate 'omitted' with those that
+ * would be filtered by 'opts'. Currently only blob:limit=N is
+ * supported. Objects that cannot be read are silently skipped.
+ *
+ * NEEDSWORK: this reimplements the blob:limit size check rather than
+ * reusing the existing filter machinery. See the matching comment in
+ * list-objects-filter.c.
+ *
+ * Return 0 on success, -1 if the filter is not supported.
+ */
+int list_objects_filter__filter_oidset(struct repository *r,
+	const struct list_objects_filter_options *opts,
+	const struct oidset *in,
+	struct oidset *omitted);
+
 #endif /* LIST_OBJECTS_FILTER_H */
diff --git a/odb/source-files.c b/odb/source-files.c
index b7b3a297bb79d7..3945d651b92cd7 100644
--- a/odb/source-files.c
+++ b/odb/source-files.c
@@ -22,8 +22,7 @@
 #include "tree.h"
 #include "write-or-die.h"
 
-static void odb_source_files_reparent(const char *name UNUSED,
-				      const char *old_cwd,
+static void odb_source_files_reparent(const char *old_cwd,
 				      const char *new_cwd,
 				      void *cb_data)
 {
@@ -37,7 +36,7 @@ static void odb_source_files_reparent(const char *name UNUSED,
 static void odb_source_files_free(struct odb_source *source)
 {
 	struct odb_source_files *files = odb_source_files_downcast(source);
-	chdir_notify_unregister(NULL, odb_source_files_reparent, files);
+	chdir_notify_unregister(odb_source_files_reparent, files);
 	odb_source_free(&files->loose->base);
 	odb_source_free(&files->packed->base);
 	odb_source_release(&files->base);
@@ -780,7 +779,7 @@ struct odb_source_files *odb_source_files_new(struct object_database *odb,
 	 * paths in the primary ODB source in some user-facing functionality.
 	 */
 	if (!is_absolute_path(path))
-		chdir_notify_register(NULL, odb_source_files_reparent, files);
+		chdir_notify_register(odb_source_files_reparent, files);
 
 	return files;
 }
diff --git a/odb/source-loose.c b/odb/source-loose.c
index bb3455dfbd3334..0921a8748082ba 100644
--- a/odb/source-loose.c
+++ b/odb/source-loose.c
@@ -1009,8 +1009,7 @@ static void odb_source_loose_close(struct odb_source *source UNUSED)
 	/* Nothing to do. */
 }
 
-static void odb_source_loose_reparent(const char *name UNUSED,
-				      const char *old_cwd,
+static void odb_source_loose_reparent(const char *old_cwd,
 				      const char *new_cwd,
 				      void *cb_data)
 {
@@ -1026,7 +1025,7 @@ static void odb_source_loose_free(struct odb_source *source)
 	struct odb_source_loose *loose = odb_source_loose_downcast(source);
 	odb_source_loose_clear_cache(loose);
 	loose_object_map_clear(&loose->map);
-	chdir_notify_unregister(NULL, odb_source_loose_reparent, loose);
+	chdir_notify_unregister(odb_source_loose_reparent, loose);
 	odb_source_release(&loose->base);
 	free(loose);
 }
@@ -1056,7 +1055,7 @@ struct odb_source_loose *odb_source_loose_new(struct object_database *odb,
 	loose->base.write_alternate = odb_source_loose_write_alternate;
 
 	if (!is_absolute_path(loose->base.path))
-		chdir_notify_register(NULL, odb_source_loose_reparent, loose);
+		chdir_notify_register(odb_source_loose_reparent, loose);
 
 	loose_object_map_load(loose);
 
diff --git a/odb/source-packed.c b/odb/source-packed.c
index 630d9555856d7c..9b23ea15dc1900 100644
--- a/odb/source-packed.c
+++ b/odb/source-packed.c
@@ -785,8 +785,7 @@ static void odb_source_packed_prepare(struct odb_source *source,
 	packed->initialized = true;
 }
 
-static void odb_source_packed_reparent(const char *name UNUSED,
-				       const char *old_cwd,
+static void odb_source_packed_reparent(const char *old_cwd,
 				       const char *new_cwd,
 				       void *cb_data)
 {
@@ -815,7 +814,7 @@ static void odb_source_packed_free(struct odb_source *source)
 {
 	struct odb_source_packed *packed = odb_source_packed_downcast(source);
 
-	chdir_notify_unregister(NULL, odb_source_packed_reparent, packed);
+	chdir_notify_unregister(odb_source_packed_reparent, packed);
 
 	for (struct packfile_list_entry *e = packed->packs.head; e; e = e->next)
 		free(e->pack);
@@ -852,7 +851,7 @@ struct odb_source_packed *odb_source_packed_new(struct object_database *odb,
 	packed->base.write_alternate = odb_source_packed_write_alternate;
 
 	if (!is_absolute_path(path))
-		chdir_notify_register(NULL, odb_source_packed_reparent, packed);
+		chdir_notify_register(odb_source_packed_reparent, packed);
 
 	return packed;
 }
diff --git a/packfile-list.c b/packfile-list.c
index 01fb913abf78fc..d6d411823c34a9 100644
--- a/packfile-list.c
+++ b/packfile-list.c
@@ -57,11 +57,12 @@ void packfile_list_prepend(struct packfile_list *list, struct packed_git *pack)
 		list->tail = entry;
 }
 
-void packfile_list_append(struct packfile_list *list, struct packed_git *pack)
+void packfile_list_append(struct packfile_list *list, struct packed_git *pack,
+			  int skip_dup_check)
 {
 	struct packfile_list_entry *entry;
 
-	entry = packfile_list_remove_internal(list, pack);
+	entry = skip_dup_check ? NULL : packfile_list_remove_internal(list, pack);
 	if (!entry) {
 		entry = xmalloc(sizeof(*entry));
 		entry->pack = pack;
diff --git a/packfile-list.h b/packfile-list.h
index 1b05e2aa36de08..2b4b98b22673a4 100644
--- a/packfile-list.h
+++ b/packfile-list.h
@@ -15,7 +15,8 @@ struct packfile_list_entry {
 void packfile_list_clear(struct packfile_list *list);
 void packfile_list_remove(struct packfile_list *list, struct packed_git *pack);
 void packfile_list_prepend(struct packfile_list *list, struct packed_git *pack);
-void packfile_list_append(struct packfile_list *list, struct packed_git *pack);
+void packfile_list_append(struct packfile_list *list, struct packed_git *pack,
+			  int skip_dup_check);
 
 /*
  * Find the pack within the "packs" list whose index contains the object
diff --git a/packfile.c b/packfile.c
index 7dc451bade983a..2ec5d221b4c088 100644
--- a/packfile.c
+++ b/packfile.c
@@ -781,7 +781,7 @@ void packfile_store_add_pack(struct odb_source_packed *store,
 	if (pack->pack_fd != -1)
 		pack_open_fds++;
 
-	packfile_list_append(&store->packs, pack);
+	packfile_list_append(&store->packs, pack, 1);
 	strmap_put(&store->packs_by_path, pack->pack_name, pack);
 }
 
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 1cc20aa486c263..71628550f20a57 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -111,8 +111,7 @@ static void clear_loose_ref_cache(struct files_ref_store *refs)
 	}
 }
 
-static void files_ref_store_reparent(const char *name UNUSED,
-				     const char *old_cwd,
+static void files_ref_store_reparent(const char *old_cwd,
 				     const char *new_cwd,
 				     void *payload)
 {
@@ -182,7 +181,7 @@ static struct ref_store *files_ref_store_init(struct repository *repo,
 		packed_ref_store_init(repo, NULL, refs->gitcommondir, opts);
 	refs->store_flags = opts->access_flags;
 
-	chdir_notify_register(NULL, files_ref_store_reparent, refs);
+	chdir_notify_register(files_ref_store_reparent, refs);
 
 	strbuf_release(&refdir);
 
@@ -234,7 +233,7 @@ static void files_ref_store_release(struct ref_store *ref_store)
 	free(refs->gitcommondir);
 	ref_store_release(refs->packed_ref_store);
 	free(refs->packed_ref_store);
-	chdir_notify_unregister(NULL, files_ref_store_reparent, refs);
+	chdir_notify_unregister(files_ref_store_reparent, refs);
 }
 
 static void files_reflog_path(struct files_ref_store *refs,
diff --git a/refs/packed-backend.c b/refs/packed-backend.c
index b9b04b70105f9a..a73fc6aca78023 100644
--- a/refs/packed-backend.c
+++ b/refs/packed-backend.c
@@ -217,8 +217,7 @@ static size_t snapshot_hexsz(const struct snapshot *snapshot)
 	return snapshot->refs->base.repo->hash_algo->hexsz;
 }
 
-static void packed_ref_store_reparent(const char *name UNUSED,
-				      const char *old_cwd,
+static void packed_ref_store_reparent(const char *old_cwd,
 				      const char *new_cwd,
 				      void *payload)
 {
@@ -248,7 +247,7 @@ struct ref_store *packed_ref_store_init(struct repository *repo,
 
 	strbuf_addf(&sb, "%s/packed-refs", gitdir);
 	refs->path = strbuf_detach(&sb, NULL);
-	chdir_notify_register(NULL, packed_ref_store_reparent, refs);
+	chdir_notify_register(packed_ref_store_reparent, refs);
 	return ref_store;
 }
 
@@ -293,7 +292,7 @@ static void packed_ref_store_release(struct ref_store *ref_store)
 	clear_snapshot(refs);
 	rollback_lock_file(&refs->lock);
 	delete_tempfile(&refs->tempfile);
-	chdir_notify_unregister(NULL, packed_ref_store_reparent, refs);
+	chdir_notify_unregister(packed_ref_store_reparent, refs);
 	free(refs->path);
 }
 
diff --git a/refs/reftable-backend.c b/refs/reftable-backend.c
index 028f0211af3d0f..08a75fb3287502 100644
--- a/refs/reftable-backend.c
+++ b/refs/reftable-backend.c
@@ -391,8 +391,7 @@ static const struct reftable_be_write_options *reftable_be_write_options(struct
 	return opts;
 }
 
-static void reftable_be_reparent(const char *name UNUSED,
-				 const char *old_cwd,
+static void reftable_be_reparent(const char *old_cwd,
 				 const char *new_cwd,
 				 void *payload)
 {
@@ -465,7 +464,7 @@ static struct ref_store *reftable_be_init(struct repository *repo,
 			goto done;
 	}
 
-	chdir_notify_register(NULL, reftable_be_reparent, refs);
+	chdir_notify_register(reftable_be_reparent, refs);
 
 done:
 	assert(refs->err != REFTABLE_API_ERROR);
@@ -492,7 +491,7 @@ static void reftable_be_release(struct ref_store *ref_store)
 		free(be);
 	}
 	strmap_clear(&refs->worktree_backends, 0);
-	chdir_notify_unregister(NULL, reftable_be_reparent, refs);
+	chdir_notify_unregister(reftable_be_reparent, refs);
 }
 
 static int reftable_be_create_on_disk(struct ref_store *ref_store,
diff --git a/repack-filtered.c b/repack-filtered.c
index edcf7667c5c378..869b9fc6e3b94c 100644
--- a/repack-filtered.c
+++ b/repack-filtered.c
@@ -3,6 +3,12 @@
 #include "repository.h"
 #include "run-command.h"
 #include "string-list.h"
+#include "hex.h"
+#include "packfile.h"
+#include "list-objects-filter-options.h"
+#include "list-objects-filter.h"
+#include "odb.h"
+#include "promisor-remote.h"
 
 int write_filtered_pack(const struct write_pack_opts *opts,
 			struct existing_packs *existing,
@@ -49,3 +55,79 @@ int write_filtered_pack(const struct write_pack_opts *opts,
 	return finish_pack_objects_cmd(existing->repo->hash_algo, opts, &cmd,
 				       names);
 }
+
+struct collect_cb_data {
+	struct repository *repo;
+	struct oidset *set;
+};
+
+static int collect_promisor_blob(const struct object_id *oid,
+				 struct object_info *oi UNUSED,
+				 void *cb_data)
+{
+	struct collect_cb_data *data = cb_data;
+	struct object_info info = OBJECT_INFO_INIT;
+	enum object_type type;
+
+	info.typep = &type;
+
+	/*
+	 * Use OBJECT_INFO_SKIP_FETCH_OBJECT to avoid triggering a
+	 * lazy fetch while collecting promisor blobs.
+	 */
+	if (odb_read_object_info_extended(data->repo->objects, oid, &info,
+			OBJECT_INFO_SKIP_FETCH_OBJECT) < 0)
+		return 0;
+
+	if (type == OBJ_BLOB)
+		oidset_insert(data->set, oid);
+
+	return 0;
+}
+
+int enumerate_promisor_blobs(struct repository *repo,
+			     const struct list_objects_filter_options *filter,
+			     struct oidset *to_drop)
+{
+	struct oidset all_promisor_blobs = OIDSET_INIT;
+	struct collect_cb_data cb = {
+		.repo = repo,
+		.set = &all_promisor_blobs
+	};
+	int ret = 0;
+
+	/*
+	 * The caller (cmd_repack) is responsible for validating that a
+	 * blob:limit filter and a promisor remote are present before
+	 * calling this function.
+	 *
+	 * Walk only promisor objects. Every object visited here is a
+	 * promisor object, so it is recoverable from the promisor remote
+	 * as long as the remote still has it, the same assumption the rest
+	 * of partial clone relies on.
+	 *
+	 * We do not use write_filtered_pack() here because git repack
+	 * routes promisor objects through repack_promisor_objects()
+	 * before the filter machinery runs, so the filtered pack never
+	 * contains promisor blobs. Direct enumeration via
+	 * ODB_FOR_EACH_OBJECT_PROMISOR_ONLY is the correct approach.
+	 */
+	ret = odb_for_each_object(repo->objects, NULL,
+			collect_promisor_blob, &cb,
+			ODB_FOR_EACH_OBJECT_PROMISOR_ONLY);
+	if (ret)
+		goto cleanup;
+
+	/*
+	 * Apply the filter to find which blobs exceed the threshold.
+	 * The caller has to_drop and is responsible for clearing it.
+	 */
+	ret = list_objects_filter__filter_oidset(repo,
+		filter,
+		&all_promisor_blobs,
+		to_drop);
+
+cleanup:
+	oidset_clear(&all_promisor_blobs);
+	return ret;
+}
diff --git a/repack-promisor.c b/repack-promisor.c
index 90318ce15093f5..fabfdc168a9b86 100644
--- a/repack-promisor.c
+++ b/repack-promisor.c
@@ -6,10 +6,12 @@
 #include "path.h"
 #include "repository.h"
 #include "run-command.h"
+#include "oidset.h"
 
 struct write_oid_context {
 	struct child_process *cmd;
 	const struct git_hash_algo *algop;
+	const struct oidset *to_drop;
 };
 
 /*
@@ -23,6 +25,15 @@ static int write_oid(const struct object_id *oid,
 	struct write_oid_context *ctx = data;
 	struct child_process *cmd = ctx->cmd;
 
+	/*
+	 * Objects in to_drop are being removed from the repository, so
+	 * omit them from the rebuilt promisor pack. Each such object is a
+	 * promisor object and therefore remains recoverable from the
+	 * promisor remote.
+	 */
+	if (ctx->to_drop && oidset_contains(ctx->to_drop, oid))
+		return 0;
+
 	if (cmd->in == -1) {
 		if (start_command(cmd))
 			die(_("could not start pack-objects to repack promisor objects"));
@@ -81,7 +92,8 @@ static void finish_repacking_promisor_objects(struct repository *repo,
 
 void repack_promisor_objects(struct repository *repo,
 			     const struct pack_objects_args *args,
-			     struct string_list *names, const char *packtmp)
+			     struct string_list *names, const char *packtmp,
+			     const struct oidset *to_drop)
 {
 	struct write_oid_context ctx;
 	struct child_process cmd = CHILD_PROCESS_INIT;
@@ -98,6 +110,7 @@ void repack_promisor_objects(struct repository *repo,
 	 */
 	ctx.cmd = &cmd;
 	ctx.algop = repo->hash_algo;
+	ctx.to_drop = to_drop;
 	odb_for_each_object(repo->objects, NULL, write_oid, &ctx,
 			    ODB_FOR_EACH_OBJECT_PROMISOR_ONLY);
 
diff --git a/repack.h b/repack.h
index f9fbc895f02940..61e554e4ed383d 100644
--- a/repack.h
+++ b/repack.h
@@ -3,6 +3,7 @@
 
 #include "list-objects-filter-options.h"
 #include "string-list.h"
+#include "oidset.h"
 
 struct pack_objects_args {
 	char *window;
@@ -100,7 +101,8 @@ void generated_pack_install(struct generated_pack *pack, const char *name,
 
 void repack_promisor_objects(struct repository *repo,
 			     const struct pack_objects_args *args,
-			     struct string_list *names, const char *packtmp);
+			     struct string_list *names, const char *packtmp,
+			     const struct oidset *to_drop);
 
 struct pack_geometry {
 	struct packed_git **pack;
@@ -165,6 +167,10 @@ int write_filtered_pack(const struct write_pack_opts *opts,
 			struct existing_packs *existing,
 			struct string_list *names);
 
+int enumerate_promisor_blobs(struct repository *repo,
+			     const struct list_objects_filter_options *filter,
+			     struct oidset *to_drop);
+
 int write_cruft_pack(const struct write_pack_opts *opts,
 		     const char *cruft_expiration,
 		     unsigned long combine_cruft_below_size,
diff --git a/setup.c b/setup.c
index 20d29f31f428b1..22beb86f7acb1e 100644
--- a/setup.c
+++ b/setup.c
@@ -1057,8 +1057,7 @@ static void apply_gitdir_and_environment(struct repository *repo, const char *pa
 	strvec_clear(&to_free);
 }
 
-static void update_relative_gitdir(const char *name UNUSED,
-				   const char *old_cwd,
+static void update_relative_gitdir(const char *old_cwd,
 				   const char *new_cwd,
 				   void *data)
 {
@@ -1086,7 +1085,7 @@ static void apply_and_export_relative_gitdir(struct repository *repo, const char
 	xsetenv(GIT_DIR_ENVIRONMENT, path, 1);
 
 	if (!is_absolute_path(path))
-		chdir_notify_register(NULL, update_relative_gitdir, repo);
+		chdir_notify_register(update_relative_gitdir, repo);
 
 	strbuf_release(&realpath);
 }
diff --git a/t/meson.build b/t/meson.build
index 181d61a8a0bd18..7f53cca7d1f891 100644
--- a/t/meson.build
+++ b/t/meson.build
@@ -966,6 +966,7 @@ integration_tests = [
   't7703-repack-geometric.sh',
   't7704-repack-cruft.sh',
   't7705-repack-incremental-midx.sh',
+  't7706-repack-drop-filtered.sh',
   't7800-difftool.sh',
   't7810-grep.sh',
   't7811-grep-open.sh',
diff --git a/t/perf/p5303-many-packs.sh b/t/perf/p5303-many-packs.sh
index af173a7b73e398..4221f9dd706243 100755
--- a/t/perf/p5303-many-packs.sh
+++ b/t/perf/p5303-many-packs.sh
@@ -141,4 +141,8 @@ test_perf "load 10,000 packs" '
 	git rev-parse --verify "HEAD^{commit}"
 '
 
+test_perf "abbreviate with 10,000 packs" '
+	git rev-parse --short HEAD
+'
+
 test_done
diff --git a/t/t7706-repack-drop-filtered.sh b/t/t7706-repack-drop-filtered.sh
new file mode 100755
index 00000000000000..cb361158349c13
--- /dev/null
+++ b/t/t7706-repack-drop-filtered.sh
@@ -0,0 +1,185 @@
+#!/bin/sh
+
+test_description='git repack --drop-filtered enumerates filtered promisor blobs'
+
+. ./test-lib.sh
+
+# Delete a loose or packed object from "repo".
+delete_object () {
+	local repo="$1" &&
+	local obj="$2" &&
+	local path="$repo/.git/objects/$(test_oid_to_path "$obj")" &&
+	rm "$path"
+}
+
+# Pack the objects into a promisor pack inside "repo". It is a pack
+# accompanied by an empty ".promisor" marker file. Objects
+# in such a pack are treated as recoverable from the promisor remote.
+pack_as_from_promisor () {
+	HASH=$(git -C repo pack-objects .git/objects/pack/pack) &&
+	>repo/.git/objects/pack/pack-$HASH.promisor &&
+	echo $HASH
+}
+
+# Write a blob of $1 bytes into "repo", record it as coming from the
+# promisor remote, and remove the loose copy so the object is only
+# present in the promisor pack.
+promisor_blob () {
+	test-tool genrandom "$1" "$2" >blob_content &&
+	OID=$(git -C repo hash-object -w --stdin <blob_content) &&
+	printf "%s\n" "$OID" | pack_as_from_promisor >/dev/null &&
+	delete_object repo "$OID" &&
+	echo "$OID"
+}
+
+# Check option validation before any promisor walk
+test_expect_success 'setup plain repo for validation' '
+	git init plain &&
+	test_commit -C plain initial &&
+	git clone --bare plain plain.git &&
+	git -C plain.git repack -a -d
+'
+
+test_expect_success '--drop-filtered requires --filter' '
+	test_must_fail git -C plain.git repack --drop-filtered --dry-run -a 2>err &&
+	test_grep "drop-filtered requires --filter" err
+'
+
+test_expect_success '--drop-filtered cannot be used with --filter-to' '
+	test_must_fail git -C plain.git repack --drop-filtered \
+		--filter=blob:limit=1k --filter-to=./filter-out 2>err &&
+	test_grep "options .--drop-filtered. and .--filter-to. cannot be used together" err
+'
+
+test_expect_success '--dry-run only takes effect with --drop-filtered' '
+	test_must_fail git -C plain.git repack --dry-run 2>err &&
+	test_grep "dry-run only takes effect with --drop-filtered" err
+'
+
+test_expect_success '--drop-filtered requires -a' '
+	test_must_fail git -C plain.git repack --drop-filtered \
+		--filter=blob:limit=1k --dry-run 2>err &&
+	test_grep "drop-filtered requires -a" err
+'
+
+test_expect_success '--drop-filtered fails with --write-bitmap-index' '
+	test_must_fail git -C plain.git repack --drop-filtered \
+		--filter=blob:limit=1k --dry-run -a -b 2>err &&
+	test_grep "options .--drop-filtered. and .--write-bitmap-index. cannot be used together" err
+'
+
+test_expect_success '--drop-filtered rejects explicit -b even when repack.writeBitmaps=true' '
+	test_must_fail git -C plain.git -c repack.writeBitmaps=true \
+		repack --drop-filtered --filter=blob:limit=1k --dry-run -a -b 2>err &&
+	test_grep "options .--drop-filtered. and .--write-bitmap-index. cannot be used together" err
+'
+
+test_expect_success '--drop-filtered fails without a promisor remote' '
+	test_must_fail git -C plain.git repack --drop-filtered \
+		--filter=blob:limit=1k --dry-run -a 2>err &&
+	test_grep "drop-filtered requires a promisor remote" err
+'
+
+# Enumeration tests using promisor pack
+test_expect_success 'setup repo with a promisor remote' '
+	rm -rf repo &&
+	test_create_repo repo &&
+	test_commit -C repo base &&
+
+	# Mark the repo as a partial clone with a promisor remote so the
+	# promisor walk and the safety guard are satisfied.
+	git -C repo config core.repositoryformatversion 1 &&
+	git -C repo config extensions.partialclone origin &&
+	git -C repo config remote.origin.promisor true &&
+	git -C repo config remote.origin.url "." &&
+
+	BIG=$(promisor_blob big 3072) &&
+	SMALL=$(promisor_blob small 512) &&
+	echo "$BIG" >big_oid &&
+	echo "$SMALL" >small_oid
+'
+
+test_expect_success 'promisor blob over the threshold is listed' '
+	BIG=$(cat big_oid) &&
+	SMALL=$(cat small_oid) &&
+
+	git -C repo -c repack.writeBitmaps=false \
+		repack --drop-filtered --filter=blob:limit=1k --dry-run -a >out &&
+
+	test_grep "$BIG" out &&
+	test_grep ! "$SMALL" out
+'
+
+test_expect_success 'locally created blob is never listed' '
+	BIG=$(cat big_oid) &&
+
+	# Large blob that exists only locally must never be a drop candidate.
+	# Dropping it would be unrecoverable.
+	test-tool genrandom local 4096 >local_content &&
+	LOCAL=$(git -C repo hash-object -w --stdin <local_content) &&
+
+	git -C repo -c repack.writeBitmaps=false \
+		repack --drop-filtered --filter=blob:limit=1k --dry-run -a >out &&
+
+	test_grep "$BIG" out &&
+	test_grep ! "$LOCAL" out
+'
+
+test_expect_success '--dry-run does not remove the filtered objects' '
+	BIG=$(cat big_oid) &&
+
+	git -C repo -c repack.writeBitmaps=false \
+		repack --drop-filtered --filter=blob:limit=1k --dry-run -a >out &&
+
+	# Candidate blob must still be present after a dry run.
+	git -C repo cat-file -e "$BIG"
+'
+
+test_expect_success '--drop-filtered removes the promisor blob locally' '
+	BIG=$(cat big_oid) &&
+	SMALL=$(cat small_oid) &&
+
+	git -C repo -c repack.writeBitmaps=false \
+		repack --drop-filtered --filter=blob:limit=1k -a &&
+
+	git -C repo cat-file --batch-all-objects --batch-check="%(objectname)" >present &&
+	test_grep ! "$BIG" present &&
+	test_grep "$SMALL" present
+'
+
+test_expect_success '--drop-filtered refuses when a merge is in progress' '
+	test_when_finished "git -C repo merge --abort || :" &&
+
+	# Create a conflicting merge so wt_status reports it.
+	git -C repo checkout -B mergebase base &&
+	echo one >repo/conflict.txt &&
+	git -C repo add conflict.txt &&
+	git -C repo commit -m one &&
+
+	git -C repo checkout -B mergeother base &&
+	echo two >repo/conflict.txt &&
+	git -C repo add conflict.txt &&
+	git -C repo commit -m two &&
+
+	test_must_fail git -C repo merge mergebase &&
+
+	test_must_fail git -C repo -c repack.writeBitmaps=false \
+		repack --drop-filtered --filter=blob:limit=1k --dry-run -a 2>err &&
+	test_grep "in progress" err
+'
+
+test_expect_success '--drop-filtered refuses to drop an index-referenced blob' '
+	# Create a large blob, add it to the index and make it a promisor object
+	# so the index references it and enumeration picks it up.
+	test-tool genrandom idx 4096 >repo/tracked-big.bin &&
+	git -C repo add tracked-big.bin &&
+	OID=$(git -C repo rev-parse :tracked-big.bin) &&
+	printf "%s\n" "$OID" | pack_as_from_promisor >/dev/null &&
+	delete_object repo "$OID" &&
+
+	test_must_fail git -C repo -c repack.writeBitmaps=false \
+		repack --drop-filtered --filter=blob:limit=1k --dry-run -a 2>err &&
+	test_grep "referenced by the current index" err
+'
+
+test_done
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index 9ae3c48ebdd5e9..628f632ebf13e4 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -2663,6 +2663,8 @@ test_expect_success 'setup for integration tests' '
 	echo content >file1 &&
 	echo more >file2 &&
 	git add file1 file2 &&
+	echo untracked >file3 &&
+	echo untracked >ufile &&
 	git commit -m one &&
 	git branch mybranch &&
 	git tag mytag
@@ -2712,6 +2714,118 @@ test_expect_success 'git -C <path> checkout uses the right repo' '
 	EOF
 '
 
+test_expect_success 'git checkout completes tracked paths when no refs match' '
+	# file1 and file2 are tracked but file3 is not
+	# there is no ref that begins with f
+	test_completion "git checkout f" <<-\EOF &&
+	file1
+	file2
+	EOF
+	test_completion "git checkout -- f" <<-\EOF
+	file1
+	file2
+	EOF
+'
+
+test_expect_success 'git checkout completes untracked paths, too' '
+	# ufile is not tracked and there is no ref that begins with u
+	test_completion "git checkout u" <<-\EOF &&
+	ufile
+	EOF
+	test_completion "git checkout -- u" <<-\EOF
+	ufile
+	EOF
+'
+
+test_expect_success 'git -C <path> checkout completes paths in specified repo' '
+	# otherfile is tracked, oops is not
+	# lostfile is tracked but lost, ufile is untracked.
+	test_when_finished "rm -rf repo-for-checkout" &&
+	git init repo-for-checkout &&
+	echo content >repo-for-checkout/otherfile &&
+	echo content >repo-for-checkout/lostfile &&
+	git -C repo-for-checkout add otherfile &&
+	git -C repo-for-checkout add lostfile &&
+	git -C repo-for-checkout commit -m otherfile &&
+	echo untracked >repo-for-checkout/oops &&
+	echo untracked >repo-for-checkout/ufile &&
+	rm -f repo-for-checkout/lostfile &&
+	test_completion "git -C repo-for-checkout checkout o" <<-\EOF &&
+	otherfile
+	EOF
+	test_completion "git -C repo-for-checkout checkout -- o" <<-\EOF &&
+	otherfile
+	EOF
+	test_completion "git -C repo-for-checkout checkout l" <<-\EOF &&
+	lostfile
+	EOF
+	test_completion "git -C repo-for-checkout checkout -- l" <<-\EOF &&
+	lostfile
+	EOF
+	test_completion "git -C repo-for-checkout checkout u" <<-\EOF &&
+	ufile
+	EOF
+	test_completion "git -C repo-for-checkout checkout -- u" <<-\EOF
+	ufile
+	EOF
+'
+
+test_expect_success 'git diff completes tracked paths when no refs match' '
+	# file1 and file2 are tracked but file3 is not
+	# there is no ref that begins with f
+	test_completion "git diff f" <<-\EOF &&
+	file1
+	file2
+	EOF
+	test_completion "git diff -- f" <<-\EOF
+	file1
+	file2
+	EOF
+'
+
+test_expect_success 'git diff [--] completes untracked paths, too' '
+	# ufile is not tracked and there is no ref that begins with u
+	test_completion "git diff u" <<-\EOF &&
+	ufile
+	EOF
+	test_completion "git diff -- u" <<-\EOF
+	ufile
+	EOF
+'
+
+test_expect_success 'git -C <path> diff completes paths in specified repo' '
+	test_when_finished "rm -rf repo-for-diff" &&
+	git init repo-for-diff &&
+	echo content >repo-for-diff/otherfile &&
+	echo content >repo-for-diff/lostfile &&
+	git -C repo-for-diff add otherfile &&
+	git -C repo-for-diff add lostfile &&
+	git -C repo-for-diff commit -m otherfile &&
+	echo untracked >repo-for-diff/oops &&
+	echo untracked >repo-for-diff/ufile &&
+	rm -f repo-for-diff/lostfile &&
+
+	test_completion "git -C repo-for-diff diff o" <<-\EOF &&
+	otherfile
+	EOF
+	test_completion "git -C repo-for-diff diff l" <<-\EOF &&
+	lostfile
+	EOF
+	test_completion "git -C repo-for-diff diff u" <<-\EOF &&
+	ufile
+	EOF
+
+	test_completion "git -C repo-for-diff diff -- o" <<-\EOF &&
+	otherfile
+	EOF
+	test_completion "git -C repo-for-diff diff -- l" <<-\EOF &&
+	lostfile
+	EOF
+	test_completion "git -C repo-for-diff diff -- u" <<-\EOF
+	ufile
+	EOF
+'
+
 test_expect_success 'show completes all refs' '
 	test_completion "git show m" <<-\EOF
 	main Z
diff --git a/tmp-objdir.c b/tmp-objdir.c
index d199d39e7c9d51..520df2df8c5a6b 100644
--- a/tmp-objdir.c
+++ b/tmp-objdir.c
@@ -37,8 +37,7 @@ static void tmp_objdir_free(struct tmp_objdir *t)
 	free(t);
 }
 
-static void tmp_objdir_reparent(const char *name UNUSED,
-				const char *old_cwd,
+static void tmp_objdir_reparent(const char *old_cwd,
 				const char *new_cwd,
 				void *cb_data)
 {
@@ -67,7 +66,7 @@ int tmp_objdir_destroy(struct tmp_objdir *t)
 
 	err = remove_dir_recursively(&t->path, 0);
 
-	chdir_notify_unregister(NULL, tmp_objdir_reparent, t);
+	chdir_notify_unregister(tmp_objdir_reparent, t);
 	tmp_objdir_free(t);
 
 	return err;
@@ -155,7 +154,7 @@ struct tmp_objdir *tmp_objdir_create(struct repository *r,
 		    repo_get_object_directory(r), prefix);
 
 	if (!is_absolute_path(t->path.buf))
-		chdir_notify_register(NULL, tmp_objdir_reparent, t);
+		chdir_notify_register(tmp_objdir_reparent, t);
 
 	if (!mkdtemp(t->path.buf)) {
 		/* free, not destroy, as we never touched the filesystem */