systemadm: display dependencies sorted

[elogind.git] / src / readahead-common.c

diff --git a/src/readahead-common.c b/src/readahead-common.c
index 85e3227f6e50d520e7972a0b1d23fe2b9905d323..67214ec3790639e1da651120fa94c05f230f7439 100644 (file)
--- 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;
         }
@@ -174,17 +208,14 @@ finish:
         return m;
 }
 
-
 #define BUMP_REQUEST_NR (16*1024)
 
 int bump_request_nr(const char *p) {
         struct stat st;
-        struct udev *udev = NULL;
-        struct udev_device *udev_device = NULL, *look_at = NULL;
-        const char *nr_requests;
         uint64_t u;
-        char nr[64], *ap = NULL;
+        char *ap = NULL, *line = NULL;
         int r;
+        dev_t d;
 
         assert(p);
 
@@ -194,54 +225,45 @@ int bump_request_nr(const char *p) {
         if (major(st.st_dev) == 0)
                 return 0;
 
-        if (!(udev = udev_new()))
-                return -ENOMEM;
+        d = st.st_dev;
+        block_get_whole_disk(d, &d);
 
-        if (!(udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev))) {
-                r = -ENOENT;
+        if (asprintf(&ap, "/sys/dev/block/%u:%u/queue/nr_requests", major(d), minor(d)) < 0) {
+                r= -ENOMEM;
                 goto finish;
         }
 
-        look_at = udev_device;
-        if (!(nr_requests = udev_device_get_sysattr_value(look_at, "queue/nr_requests"))) {
-
-                /* Hmm, if the block device doesn't have a queue
-                 * subdir, the let's look in the parent */
-                look_at = udev_device_get_parent(udev_device);
-                nr_requests = udev_device_get_sysattr_value(look_at, "queue/nr_requests");
-        }
-
-        if (!nr_requests) {
-                r = -ENOENT;
+        r = read_one_line_file(ap, &line);
+        if (r < 0) {
+                if (r == -ENOENT)
+                        r = 0;
                 goto finish;
         }
 
-        if (safe_atou64(nr_requests, &u) >= 0 && u >= BUMP_REQUEST_NR) {
+        r = safe_atou64(line, &u);
+        if (r >= 0 && u >= BUMP_REQUEST_NR) {
                 r = 0;
                 goto finish;
         }
 
-        if (asprintf(&ap, "%s/queue/nr_requests", udev_device_get_syspath(look_at)) < 0) {
+        free(line);
+        line = NULL;
+
+        if (asprintf(&line, "%lu", (unsigned long) BUMP_REQUEST_NR) < 0) {
                 r = -ENOMEM;
                 goto finish;
         }
 
-        snprintf(nr, sizeof(nr), "%lu", (unsigned long) BUMP_REQUEST_NR);
-
-        if ((r = write_one_line_file(ap, nr)) < 0)
+        r = write_one_line_file(ap, line);
+        if (r < 0)
                 goto finish;
 
-        log_info("Bumped block_nr parameter of %s to %lu. This is a temporary hack and should be removed one day.", udev_device_get_devnode(look_at), (unsigned long) BUMP_REQUEST_NR);
+        log_info("Bumped block_nr parameter of %u:%u to %lu. This is a temporary hack and should be removed one day.", major(d), minor(d), (unsigned long) BUMP_REQUEST_NR);
         r = 1;
 
 finish:
-        if (udev_device)
-                udev_device_unref(udev_device);
-
-        if (udev)
-                udev_unref(udev);
-
         free(ap);
+        free(line);
 
         return r;
 }