fstools: Add support to read-only MTD partitions (eg. recovery images)

[project/fstools.git] / libfstools / mtd.c

diff --git a/libfstools/mtd.c b/libfstools/mtd.c
index 77c71eeb29a3ba7a67c42514b5e17e324baf53d4..aae633e6ff1ff2eb29b2178fb22eb9d128bbcb03 100644 (file)
--- a/libfstools/mtd.c
+++ b/libfstools/mtd.c
@@ -36,20 +36,31 @@ struct mtd_volume {
 
 static struct driver mtd_driver;
 
+static int mtd_open_device(const char *dev)
+{
+       int ret;
+
+       ret = open(dev, O_RDWR | O_SYNC);
+       if (ret < 0)
+               ret = open(dev, O_RDONLY);
+
+       return ret;
+}
+
 static int mtd_open(const char *mtd, int block)
 {
        FILE *fp;
        char dev[PATH_MAX];
-       int i, ret, flags = O_RDWR | O_SYNC;
+       int i, ret;
 
        if ((fp = fopen("/proc/mtd", "r"))) {
                while (fgets(dev, sizeof(dev), fp)) {
                        if (sscanf(dev, "mtd%d:", &i) && strstr(dev, mtd)) {
                                snprintf(dev, sizeof(dev), "/dev/mtd%s/%d", (block ? "block" : ""), i);
-                               ret = open(dev, flags);
+                               ret = mtd_open_device(dev);
                                if (ret < 0) {
                                        snprintf(dev, sizeof(dev), "/dev/mtd%s%d", (block ? "block" : ""), i);
-                                       ret = open(dev, flags);
+                                       ret = mtd_open_device(dev);
                                }
                                fclose(fp);
                                return ret;
@@ -58,7 +69,7 @@ static int mtd_open(const char *mtd, int block)
                fclose(fp);
        }
 
-       return open(mtd, flags);
+       return mtd_open_device(mtd);
 }
 
 static void mtd_volume_close(struct mtd_volume *p)