X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Freadahead-common.c;h=e991dfd05d69d130e4aee283acfa83a257b95c8b;hp=85e3227f6e50d520e7972a0b1d23fe2b9905d323;hb=2b590e135f53a1bd3e771bdc555f7bf28c4cd232;hpb=c1b664d055276f47f152fe90d1dd765c384271bc

diff --git a/src/readahead-common.c b/src/readahead-common.c
index 85e3227f6..e991dfd05 100644
--- a/src/readahead-common.c
+++ b/src/readahead-common.c
@@ -114,6 +114,41 @@ finish:
         return b;
 }
 
+int fs_on_read_only(const char *p) {
+        struct stat st;
+        struct udev *udev = NULL;
+        struct udev_device *udev_device = NULL;
+        bool b = false;
+        const char *read_only;
+
+        assert(p);
+
+        if (stat(p, &st) < 0)
+                return -errno;
+
+        if (major(st.st_dev) == 0)
+                return false;
+
+        if (!(udev = udev_new()))
+                return -ENOMEM;
+
+        if (!(udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev)))
+                goto finish;
+
+        if ((read_only = udev_device_get_sysattr_value(udev_device, "ro")))
+                if ((b = streq(read_only, "1")))
+                        goto finish;
+
+finish:
+        if (udev_device)
+                udev_device_unref(udev_device);
+
+        if (udev)
+                udev_unref(udev);
+
+        return b;
+}
+
 bool enough_ram(void) {
         struct sysinfo si;