X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Freadahead-common.c;h=f0d57b4c6e49c1192dfe50b6fc57014ab893bbd5;hb=d937fbbd97760d4d1a59dc0fa6f3000e57a96998;hp=85e3227f6e50d520e7972a0b1d23fe2b9905d323;hpb=de58283f71162d3e6522b67e044f8f9ee9fdf066;p=elogind.git

diff --git a/src/readahead-common.c b/src/readahead-common.c
index 85e3227f6..f0d57b4c6 100644
--- a/src/readahead-common.c
+++ b/src/readahead-common.c
@@ -114,14 +114,48 @@ 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;
 
         assert_se(sysinfo(&si) >= 0);
 
-        return si.totalram > 127 * 1024*1024; /* Enable readahead only
-                                               * with at least 128MB
-                                               * memory */
+        /* Enable readahead only with at least 128MB memory */
+        return si.totalram > 127 * 1024*1024 / si.mem_unit;
 }
 
 int open_inotify(void) {
@@ -132,11 +166,11 @@ int open_inotify(void) {
                 return -errno;
         }
 
-        mkdir("/dev/.systemd", 0755);
-        mkdir("/dev/.systemd/readahead", 0755);
+        mkdir("/run/systemd", 0755);
+        mkdir("/run/systemd/readahead", 0755);
 
-        if (inotify_add_watch(fd, "/dev/.systemd/readahead", IN_CREATE) < 0) {
-                log_error("Failed to watch /dev/.systemd/readahead: %m");
+        if (inotify_add_watch(fd, "/run/systemd/readahead", IN_CREATE) < 0) {
+                log_error("Failed to watch /run/systemd/readahead: %m");
                 close_nointr_nofail(fd);
                 return -errno;
         }
@@ -148,10 +182,10 @@ ReadaheadShared *shared_get(void) {
         int fd;
         ReadaheadShared *m = NULL;
 
-        mkdir("/dev/.systemd", 0755);
-        mkdir("/dev/.systemd/readahead", 0755);
+        mkdir("/run/systemd", 0755);
+        mkdir("/run/systemd/readahead", 0755);
 
-        if ((fd = open("/dev/.systemd/readahead/shared", O_CREAT|O_RDWR|O_CLOEXEC, 0644)) < 0) {
+        if ((fd = open("/run/systemd/readahead/shared", O_CREAT|O_RDWR|O_CLOEXEC, 0644)) < 0) {
                 log_error("Failed to create shared memory segment: %m");
                 goto finish;
         }
@@ -174,7 +208,6 @@ finish:
         return m;
 }
 
-
 #define BUMP_REQUEST_NR (16*1024)
 
 int bump_request_nr(const char *p) {