shithub: unionfs

Download patch

ref: bdb8c71c5028d1e3a0639ddbe4bb323b4cc98109
parent: 0f4c61a67f143d93d4201bc803578d7cc160c439
author: kvik <kvik@a-b.xyz>
date: Mon Apr 20 11:25:06 EDT 2020 

Rearrange code in preparation for future work

In working towards a couple new features and improving
some other stuff it is getting a bit obvious that some
things need rearranging.


--- a/unionfs.c
+++ b/unionfs.c
@@ -3,115 +3,13 @@
 #include <fcall.h>
 #include <thread.h>
 #include <9p.h>
+#include "unionfs.h"
 
-typedef struct Union Union;
-typedef struct F F;
-typedef struct Ftab Ftab;
-typedef struct Fstate Fstate;
-typedef struct Qtab Qtab;
-
-struct Union {
-	char *root;
-	int create;
-	Union *prev, *next;
-};
-
-enum {
-	Nqbit = 5,
-	Nqtab = 1<<Nqbit,
-	Nftab = 32,
-	Nftlist = 32,
-};
-
-struct Qtab {
-	ushort type;
-	uint dev;
-	uvlong path, uniqpath;
-	Qtab *next;
-};
-
-struct F {
-	Ref;
-	Dir;
-	Qtab *qtab;
-	char *path;	/* real path */
-	char *fspath;	/* internal path */
-};
-
-struct Ftab {
-	long n, sz;
-	F **l;
-};
-
-struct Fstate {
-	int fd;
-	F *file;
-	Ftab *ftab;
-};
-
 Union u0 = {.next = &u0, .prev = &u0};
 Union *unionlist = &u0;
 Qtab *qidtab[Nqtab];
 F *root;
 
-void*
-emalloc(ulong sz)
-{
-	void *v;
-
-	if((v = malloc(sz)) == nil)
-		sysfatal("emalloc: %r");
-	memset(v, 0, sz);
-	setmalloctag(v, getcallerpc(&sz));
-	
-	return v;
-}
-
-void*
-erealloc(void *v, ulong sz)
-{
-	if((v = realloc(v, sz)) == nil && sz != 0)
-		sysfatal("realloc: %r");
-	setrealloctag(v, getcallerpc(&v));
-	return v;
-}
-
-char*
-estrdup(char *s)
-{
-	char *p;
-
-	if((p = strdup(s)) == nil)
-		sysfatal("estrdup: %r");
-	setmalloctag(p, getcallerpc(&s));
-	return p;
-}
-
-char*
-mkpath(char *a0, ...)
-{
-	va_list args;
-	int i;
-	char *a;
-	char *ap[] = {a0, "", ""};
-
-	va_start(args, a0);
-	for(i = 1; (a = va_arg(args, char*)) != nil && i < 3; i++)
-		ap[i] = a;
-	va_end(args);
-	if((a = smprint("%s/%s/%s", ap[0], ap[1], ap[2])) == nil)
-		sysfatal("smprint: %r");
-
-	return cleanname(a);
-}
-
-Ref*
-copyref(Ref *r)
-{
-	incref(r);
-	return r;
-}
-
 int
 qthash(uvlong path)
 {
@@ -682,19 +580,6 @@
 	respond(r, nil);
 }
 
-Srv fs = {
-	.attach = fsattach,
-	.walk = fswalk,
-	.open = fsopen,
-	.create = fscreate,
-	.remove = fsremove,
-	.read = fsread,
-	.write = fswrite,
-	.stat = fsstat,
-	.wstat = fswstat,
-	.destroyfid = destroyfid,
-};
-
 char*
 pivot(char *p)
 {
@@ -708,12 +593,18 @@
 	return q;
 }
 
-void
-usage(void)
-{
-	fprint(2, "%s [-abiC] [-m mtpt] [-s srv] [-c] path ...\n", argv0);
-	exits("usage");
-}
+Srv fs = {
+	.attach = fsattach,
+	.walk = fswalk,
+	.open = fsopen,
+	.create = fscreate,
+	.remove = fsremove,
+	.read = fsread,
+	.write = fswrite,
+	.stat = fsstat,
+	.wstat = fswstat,
+	.destroyfid = destroyfid,
+};
 
 void
 main(int argc, char *argv[])
--- /dev/null
+++ b/unionfs.h
@@ -1,0 +1,51 @@
+enum {
+	Nqbit = 5,
+	Nqtab = 1<<Nqbit,
+	Nftab = 32,
+	Nftlist = 32,
+};
+
+typedef struct Union Union;
+typedef struct F F;
+typedef struct Ftab Ftab;
+typedef struct Fstate Fstate;
+typedef struct Qtab Qtab;
+
+struct Union {
+	char *root;
+	int create;
+	Union *prev, *next;
+};
+
+struct Qtab {
+	ushort type;
+	uint dev;
+	uvlong path, uniqpath;
+	Qtab *next;
+};
+
+struct F {
+	Ref;
+	Dir;
+	Qtab *qtab;
+	char *path;   /* real path */
+	char *fspath; /* internal path */
+};
+
+struct Ftab {
+	long n, sz;
+	F **l;
+};
+
+struct Fstate {
+	int fd;
+	F *file;
+	Ftab *ftab;
+};
+
+void usage(void);
+char *mkpath(char*, ...);
+Ref *copyref(Ref*);
+void *emalloc(ulong);
+void *erealloc(void*, ulong);
+char *estrdup(char*);
--- /dev/null
+++ b/util.c
@@ -1,0 +1,72 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include "unionfs.h"
+
+void
+usage(void)
+{
+	fprint(2, "%s [-abiC] [-m mtpt] [-s srv] [-c] path ...\n", argv0);
+	exits("usage");
+}
+
+char*
+mkpath(char *a0, ...)
+{
+	va_list args;
+	int i;
+	char *a;
+	char *ap[] = {a0, "", ""};
+
+	va_start(args, a0);
+	for(i = 1; (a = va_arg(args, char*)) != nil && i < 3; i++)
+		ap[i] = a;
+	va_end(args);
+	if((a = smprint("%s/%s/%s", ap[0], ap[1], ap[2])) == nil)
+		sysfatal("smprint: %r");
+
+	return cleanname(a);
+}
+
+Ref*
+copyref(Ref *r)
+{
+	incref(r);
+	return r;
+}
+
+/*
+ * Error-checked library functions
+ */
+
+void*
+emalloc(ulong sz)
+{
+	void *v;
+
+	if((v = malloc(sz)) == nil)
+		sysfatal("emalloc: %r");
+	memset(v, 0, sz);
+	setmalloctag(v, getcallerpc(&sz));
+	return v;
+}
+
+void*
+erealloc(void *v, ulong sz)
+{
+	if((v = realloc(v, sz)) == nil && sz != 0)
+		sysfatal("realloc: %r");
+	setrealloctag(v, getcallerpc(&v));
+	return v;
+}
+
+char*
+estrdup(char *s)
+{
+	char *p;
+
+	if((p = strdup(s)) == nil)
+		sysfatal("estrdup: %r");
+	setmalloctag(p, getcallerpc(&s));
+	return p;
+}