From 06b73dbd7ffc0296b2ecea8d3bc55bfeb72d7f2a Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kent.overstreet@gmail.com>
Date: Wed, 1 Mar 2017 01:45:15 -0900
Subject: cmd_migrate

---
 tools-util.h | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 116 insertions(+), 4 deletions(-)

(limited to 'tools-util.h')

diff --git a/tools-util.h b/tools-util.h
index 09f00ef..1aac56a 100644
--- a/tools-util.h
+++ b/tools-util.h
@@ -5,21 +5,31 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 
+#include <linux/bug.h>
 #include <linux/byteorder.h>
 #include <linux/kernel.h>
 #include <linux/log2.h>
 #include <linux/string.h>
 #include <linux/types.h>
+#include "ccan/darray/darray.h"
 
-#define die(arg, ...)					\
-do {							\
-	fprintf(stderr, arg "\n", ##__VA_ARGS__);	\
-	exit(EXIT_FAILURE);				\
+#define die(arg, ...)							\
+do {									\
+	fprintf(stderr, arg "\n", ##__VA_ARGS__);			\
+	exit(EXIT_FAILURE);						\
 } while (0)
 
+#define mprintf(...)							\
+({									\
+	char *_str;							\
+	asprintf(&_str, __VA_ARGS__);					\
+	_str;								\
+})
+
 static inline void *xcalloc(size_t count, size_t size)
 {
 	void *p = calloc(count, size);
@@ -57,6 +67,38 @@ static inline void xpwrite(int fd, const void *buf, size_t count, off_t offset)
 		die("write error (ret %zi err %s)", r, strerror(errno));
 }
 
+#define xopenat(_dirfd, _path, ...)					\
+({									\
+	int _fd = openat((_dirfd), (_path), __VA_ARGS__);		\
+	if (_fd < 0)							\
+		die("Error opening %s: %s", (_path), strerror(errno));	\
+	_fd;								\
+})
+
+#define xopen(...)	xopenat(AT_FDCWD, __VA_ARGS__)
+
+static inline struct stat xfstatat(int dirfd, const char *path, int flags)
+{
+	struct stat stat;
+	if (fstatat(dirfd, path, &stat, flags))
+		die("stat error: %s", strerror(errno));
+	return stat;
+}
+
+static inline struct stat xfstat(int fd)
+{
+	struct stat stat;
+	if (fstat(fd, &stat))
+		die("stat error: %s", strerror(errno));
+	return stat;
+}
+
+#define xioctl(_fd, _nr, ...)						\
+do {									\
+	if (ioctl((_fd), (_nr), ##__VA_ARGS__))				\
+		die(#_nr " ioctl error: %s", strerror(errno));		\
+} while (0)
+
 enum units {
 	BYTES,
 	SECTORS,
@@ -91,4 +133,74 @@ struct bcache_handle bcache_fs_open(const char *);
 
 bool ask_yn(void);
 
+struct range {
+	u64		start;
+	u64		end;
+};
+
+typedef darray(struct range) ranges;
+
+static inline void range_add(ranges *data, u64 offset, u64 size)
+{
+	darray_append(*data, (struct range) {
+		.start = offset,
+		.end = offset + size
+	});
+}
+
+void ranges_sort_merge(ranges *);
+void ranges_roundup(ranges *, unsigned);
+void ranges_rounddown(ranges *, unsigned);
+
+struct hole_iter {
+	ranges		r;
+	size_t		idx;
+	u64		end;
+};
+
+static inline struct range hole_iter_next(struct hole_iter *iter)
+{
+	struct range r = {
+		.start	= iter->idx ? iter->r.item[iter->idx - 1].end : 0,
+		.end	= iter->idx < iter->r.size
+			? iter->r.item[iter->idx].start : iter->end,
+	};
+
+	BUG_ON(r.start > r.end);
+
+	iter->idx++;
+	return r;
+}
+
+#define for_each_hole(_iter, _ranges, _end, _i)				\
+	for (_iter = (struct hole_iter) { .r = _ranges, .end = _end };	\
+	     (_iter.idx <= _iter.r.size &&				\
+	      (_i = hole_iter_next(&_iter), true));)
+
+#include <linux/fiemap.h>
+
+struct fiemap_iter {
+	struct fiemap		f;
+	struct fiemap_extent	fe[1024];
+	unsigned		idx;
+	int			fd;
+};
+
+static inline void fiemap_iter_init(struct fiemap_iter *iter, int fd)
+{
+	memset(iter, 0, sizeof(*iter));
+
+	iter->f.fm_extent_count	= ARRAY_SIZE(iter->fe);
+	iter->f.fm_length	= FIEMAP_MAX_OFFSET;
+	iter->fd		= fd;
+}
+
+struct fiemap_extent fiemap_iter_next(struct fiemap_iter *);
+
+#define fiemap_for_each(fd, iter, extent)				\
+	for (fiemap_iter_init(&iter, fd);				\
+	     (extent = fiemap_iter_next(&iter)).fe_length;)
+
+const char *strcmp_prefix(const char *, const char *);
+
 #endif /* _TOOLS_UTIL_H */
-- 
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