This patch introduce open_btrfs_dir() to open a dir in btrfs
filesystem.
It can be used for several tools in btrfs-progs.
Signed-off-by: Zhao Lei <zhao...@cn.fujitsu.com>
---
utils.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
utils.h | 1 +
2 files changed, 48 insertions(+)
diff --git a/utils.c b/utils.c
index 1dfcc2d..d849929 100644
--- a/utils.c
+++ b/utils.c
@@ -36,6 +36,8 @@
#include <limits.h>
#include <blkid/blkid.h>
#include <sys/vfs.h>
+#include <sys/statfs.h>
+#include <linux/magic.h>
#include "kerncompat.h"
#include "radix-tree.h"
@@ -1081,6 +1083,51 @@ int open_path_or_dev_mnt(const char *path, DIR
**dirstream)
return fdmnt;
}
+/*
+ * Do following check before open_file_or_dir():
+ * 1: path is in a btrfs filesystem
+ * 2: path is a dir
+ */
+int open_btrfs_dir(const char *path, DIR **dirstream, int output)
+{
+ struct statfs stfs;
+ struct stat st;
+
+ if (statfs(path, &stfs) != 0) {
+ if (output)
+ fprintf(stderr,
+ "ERROR: can't access '%s', %s\n",
+ path, strerror(errno));
+ return -1;
+ }
+
+ if (stfs.f_type != BTRFS_SUPER_MAGIC) {
+ if (output)
+ fprintf(stderr,
+ "ERROR: not btrfs filesystem: %s\n",
+ path);
+ return -2;
+ }
+
+ if (stat(path, &st) != 0) {
+ if (output)
+ fprintf(stderr,
+ "ERROR: can't access '%s', %s\n",
+ path, strerror(errno));
+ return -1;
+ }
+
+ if (!S_ISDIR(st.st_mode)) {
+ if (output)
+ fprintf(stderr,
+ "ERROR: not directory: %s\n",
+ path);
+ return -3;
+ }
+
+ return open_file_or_dir(path, dirstream);
+}
+
/* checks if a device is a loop device */
static int is_loop_device (const char* device) {
struct stat statbuf;
diff --git a/utils.h b/utils.h
index 8ec23c9..87c0d08 100644
--- a/utils.h
+++ b/utils.h
@@ -158,6 +158,7 @@ int is_block_device(const char *file);
int is_mount_point(const char *file);
int check_arg_type(const char *input);
int open_path_or_dev_mnt(const char *path, DIR **dirstream);
+int open_btrfs_dir(const char *path, DIR **dirstream, int output);
u64 btrfs_device_size(int fd, struct stat *st);
/* Helper to always get proper size of the destination string */
#define strncpy_null(dest, src) __strncpy__null(dest, src, sizeof(dest))
--
1.8.5.1
--
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