config: make packed_git_(limit|window_size) non-global variables

The variables `packed_git_window_size` and `packed_git_limit` are global
config variables used in the `packfile.c` file. Since it is only used in
this file, let's change it from being a global config variable to a
local variable for the subsystem.

With this, we rid `packfile.c` from all global variable usage and this
means we can also remove the `USE_THE_REPOSITORY_VARIABLE` guard from
the file.

Helped-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/fast-import.c

@@ -3539,7 +3539,7 @@ static void parse_argv(void)
 int cmd_fast_import(int argc,
 		    const char **argv,
 		    const char *prefix,
-		    struct repository *repo UNUSED)
+		    struct repository *repo)
 {
 	unsigned int i;
 
@@ -3660,7 +3660,7 @@ int cmd_fast_import(int argc,
 		fprintf(stderr, "       pools:    %10lu KiB\n", (unsigned long)((tree_entry_allocd + fi_mem_pool.pool_alloc) /1024));
 		fprintf(stderr, "     objects:    %10" PRIuMAX " KiB\n", (alloc_count*sizeof(struct object_entry))/1024);
 		fprintf(stderr, "---------------------------------------------------------------------\n");
-		pack_report();
+		pack_report(repo);
 		fprintf(stderr, "---------------------------------------------------------------------\n");
 		fprintf(stderr, "\n");
 	}

config.c

@@ -1493,28 +1493,11 @@ static int git_default_core_config(const char *var, const char *value,
 		return 0;
 	}
 
-	if (!strcmp(var, "core.packedgitwindowsize")) {
-		int pgsz_x2 = getpagesize() * 2;
-		packed_git_window_size = git_config_ulong(var, value, ctx->kvi);
-
-		/* This value must be multiple of (pagesize * 2) */
-		packed_git_window_size /= pgsz_x2;
-		if (packed_git_window_size < 1)
-			packed_git_window_size = 1;
-		packed_git_window_size *= pgsz_x2;
-		return 0;
-	}
-
 	if (!strcmp(var, "core.bigfilethreshold")) {
 		big_file_threshold = git_config_ulong(var, value, ctx->kvi);
 		return 0;
 	}
 
-	if (!strcmp(var, "core.packedgitlimit")) {
-		packed_git_limit = git_config_ulong(var, value, ctx->kvi);
-		return 0;
-	}
-
 	if (!strcmp(var, "core.autocrlf")) {
 		if (value && !strcasecmp(value, "input")) {
 			auto_crlf = AUTO_CRLF_INPUT;

environment.c

@@ -49,8 +49,6 @@ int fsync_object_files = -1;
 int use_fsync = -1;
 enum fsync_method fsync_method = FSYNC_METHOD_DEFAULT;
 enum fsync_component fsync_components = FSYNC_COMPONENTS_DEFAULT;
-size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
-size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
 unsigned long big_file_threshold = 512 * 1024 * 1024;
 char *editor_program;
 char *askpass_program;

packfile.c

@@ -1,4 +1,3 @@
-#define USE_THE_REPOSITORY_VARIABLE
 
 #include "git-compat-util.h"
 #include "environment.h"
@@ -46,15 +45,15 @@ static size_t pack_mapped;
 #define SZ_FMT PRIuMAX
 static inline uintmax_t sz_fmt(size_t s) { return s; }
 
-void pack_report(void)
+void pack_report(struct repository *repo)
 {
 	fprintf(stderr,
 		"pack_report: getpagesize()            = %10" SZ_FMT "\n"
 		"pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
 		"pack_report: core.packedGitLimit      = %10" SZ_FMT "\n",
 		sz_fmt(getpagesize()),
-		sz_fmt(packed_git_window_size),
-		sz_fmt(packed_git_limit));
+		sz_fmt(repo->settings.packed_git_window_size),
+		sz_fmt(repo->settings.packed_git_limit));
 	fprintf(stderr,
 		"pack_report: pack_used_ctr            = %10u\n"
 		"pack_report: pack_mmap_calls          = %10u\n"
@@ -650,8 +649,15 @@ unsigned char *use_pack(struct packed_git *p,
 				break;
 		}
 		if (!win) {
-			size_t window_align = packed_git_window_size / 2;
+			size_t window_align;
 			off_t len;
+			struct repo_settings *settings;
+
+			/* lazy load the settings in case it hasn't been setup */
+			prepare_repo_settings(p->repo);
+			settings = &p->repo->settings;
+
+			window_align = settings->packed_git_window_size / 2;
 
 			if (p->pack_fd == -1 && open_packed_git(p))
 				die("packfile %s cannot be accessed", p->pack_name);
@@ -659,11 +665,12 @@ unsigned char *use_pack(struct packed_git *p,
 			CALLOC_ARRAY(win, 1);
 			win->offset = (offset / window_align) * window_align;
 			len = p->pack_size - win->offset;
-			if (len > packed_git_window_size)
-				len = packed_git_window_size;
+			if (len > settings->packed_git_window_size)
+				len = settings->packed_git_window_size;
 			win->len = (size_t)len;
 			pack_mapped += win->len;
-			while (packed_git_limit < pack_mapped
+
+			while (settings->packed_git_limit < pack_mapped
 				&& unuse_one_window(p))
 				; /* nothing */
 			win->base = xmmap_gently(NULL, win->len,

packfile.h

@@ -89,7 +89,7 @@ unsigned long repo_approximate_object_count(struct repository *r);
 struct packed_git *find_oid_pack(const struct object_id *oid,
 				 struct packed_git *packs);
 
-void pack_report(void);
+void pack_report(struct repository *repo);
 
 /*
  * mmap the index file for the specified packfile (if it is not

repo-settings.c

@@ -128,6 +128,19 @@ void prepare_repo_settings(struct repository *r)
 
 	if (!repo_config_get_ulong(r, "core.deltabasecachelimit", &ulongval))
 		r->settings.delta_base_cache_limit = ulongval;
+
+	if (!repo_config_get_ulong(r, "core.packedgitwindowsize", &ulongval)) {
+		int pgsz_x2 = getpagesize() * 2;
+
+		/* This value must be multiple of (pagesize * 2) */
+		ulongval /= pgsz_x2;
+		if (ulongval < 1)
+			ulongval = 1;
+		r->settings.packed_git_window_size = ulongval * pgsz_x2;
+	}
+
+	if (!repo_config_get_ulong(r, "core.packedgitlimit", &ulongval))
+		r->settings.packed_git_limit = ulongval;
 }
 
 enum log_refs_config repo_settings_get_log_all_ref_updates(struct repository *repo)

repo-settings.h

@@ -59,6 +59,8 @@ struct repo_settings {
 	int warn_ambiguous_refs; /* lazily loaded via accessor */
 
 	size_t delta_base_cache_limit;
+	size_t packed_git_window_size;
+	size_t packed_git_limit;
 };
 #define REPO_SETTINGS_INIT { \
 	.index_version = -1, \
@@ -66,6 +68,8 @@ struct repo_settings {
 	.fetch_negotiation_algorithm = FETCH_NEGOTIATION_CONSECUTIVE, \
 	.warn_ambiguous_refs = -1, \
 	.delta_base_cache_limit = DEFAULT_DELTA_BASE_CACHE_LIMIT, \
+	.packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE, \
+	.packed_git_limit = DEFAULT_PACKED_GIT_LIMIT, \
 }
 
 void prepare_repo_settings(struct repository *r);