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-rw-r--r--tools/lib/api/fs/findfs.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/tools/lib/api/fs/findfs.c b/tools/lib/api/fs/findfs.c
new file mode 100644
index 000000000000..49946cb6d7af
--- /dev/null
+++ b/tools/lib/api/fs/findfs.c
@@ -0,0 +1,63 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <sys/vfs.h>
+
+#include "findfs.h"
+
+/* verify that a mountpoint is actually the type we want */
+
+int valid_mountpoint(const char *mount, long magic)
+{
+ struct statfs st_fs;
+
+ if (statfs(mount, &st_fs) < 0)
+ return -ENOENT;
+ else if ((long)st_fs.f_type != magic)
+ return -ENOENT;
+
+ return 0;
+}
+
+/* find the path to a mounted file system */
+const char *find_mountpoint(const char *fstype, long magic,
+ char *mountpoint, int len,
+ const char * const *known_mountpoints)
+{
+ const char * const *ptr;
+ char format[128];
+ char type[100];
+ FILE *fp;
+
+ if (known_mountpoints) {
+ ptr = known_mountpoints;
+ while (*ptr) {
+ if (valid_mountpoint(*ptr, magic) == 0) {
+ strncpy(mountpoint, *ptr, len - 1);
+ mountpoint[len-1] = 0;
+ return mountpoint;
+ }
+ ptr++;
+ }
+ }
+
+ /* give up and parse /proc/mounts */
+ fp = fopen("/proc/mounts", "r");
+ if (fp == NULL)
+ return NULL;
+
+ snprintf(format, 128, "%%*s %%%ds %%99s %%*s %%*d %%*d\n", len);
+
+ while (fscanf(fp, format, mountpoint, type) == 2) {
+ if (strcmp(type, fstype) == 0)
+ break;
+ }
+ fclose(fp);
+
+ if (strcmp(type, fstype) != 0)
+ return NULL;
+
+ return mountpoint;
+}