fsck: simplify client destruction logic

[elogind.git] / src / fsckd / fsckd.c

diff --git a/src/fsckd/fsckd.c b/src/fsckd/fsckd.c
index 4ff8eeaeccf584cf8f84e205e97c76fe09cb9c37..14fa994008edd09f077ecd244c017ca5f654718d 100644 (file)
--- a/src/fsckd/fsckd.c
+++ b/src/fsckd/fsckd.c
@@ -54,10 +54,13 @@ typedef struct Client {
         struct Manager *manager;
         int fd;
         dev_t devnum;
+
         size_t cur;
         size_t max;
         int pass;
+
         double percent;
+
         size_t buflen;
         bool cancelled;
 
@@ -66,14 +69,20 @@ typedef struct Client {
 
 typedef struct Manager {
         sd_event *event;
-        Client *clients;
+
+        LIST_HEAD(Client, clients);
+
         int clear;
         int connection_fd;
+
         FILE *console;
         double percent;
         int numdevices;
+
         int plymouth_fd;
+        sd_event_source *plymouth_event_source;
         bool plymouth_cancel_sent;
+
         bool cancel_requested;
 } Manager;
 
@@ -120,13 +129,20 @@ static int request_cancel_client(Client *current) {
         return 0;
 }
 
-static void remove_client(Client **first, Client *item) {
-        LIST_REMOVE(clients, *first, item);
-        safe_close(item->fd);
-        free(item);
+static void client_free(Client *c) {
+        assert(c);
+
+        if (c->manager)
+                LIST_REMOVE(clients, c->manager->clients, c);
+
+        safe_close(c->fd);
+        free(c);
 }
 
-static void on_plymouth_disconnect(Manager *m) {
+static void plymouth_disconnect(Manager *m) {
+        assert(m);
+
+        m->plymouth_event_source = sd_event_source_unref(m->plymouth_event_source);
         m->plymouth_fd = safe_close(m->plymouth_fd);
         m->plymouth_cancel_sent = false;
 }
@@ -135,24 +151,31 @@ static int plymouth_feedback_handler(sd_event_source *s, int fd, uint32_t revent
         Manager *m = userdata;
         Client *current;
         char buffer[6];
-        int r;
+        ssize_t l;
 
         assert(m);
 
-        r = read(m->plymouth_fd, buffer, sizeof(buffer));
-        if (r <= 0)
-                on_plymouth_disconnect(m);
-        else {
-               if (buffer[0] == '\15')
-                       log_error("Message update to plymouth wasn't delivered successfully");
-
-               /* the only answer support type we requested is a key interruption */
-               if (buffer[0] == '\2' && buffer[5] == '\3') {
-                       m->cancel_requested = true;
-                       /* cancel all connected clients */
-                       LIST_FOREACH(clients, current, m->clients)
-                               request_cancel_client(current);
-               }
+        l = read(m->plymouth_fd, buffer, sizeof(buffer));
+        if (l < 0) {
+                log_warning_errno(errno, "Got error while reading from plymouth: %m");
+                plymouth_disconnect(m);
+                return -errno;
+        }
+        if (l == 0) {
+                plymouth_disconnect(m);
+                return 0;
+        }
+
+        if (buffer[0] == '\15')
+                log_error("Message update to plymouth wasn't delivered successfully");
+
+        /* the only answer support type we requested is a key interruption */
+        if (buffer[0] == '\2' && buffer[5] == '\3') {
+                m->cancel_requested = true;
+
+                /* cancel all connected clients */
+                LIST_FOREACH(clients, current, m->clients)
+                        request_cancel_client(current);
         }
 
         return 0;
@@ -276,7 +299,7 @@ static int connect_plymouth(Manager *m) {
                 goto fail;
         }
 
-        r = sd_event_add_io(m->event, NULL, m->plymouth_fd, EPOLLIN, plymouth_feedback_handler, m);
+        r = sd_event_add_io(m->event, &m->plymouth_event_source, m->plymouth_fd, EPOLLIN, plymouth_feedback_handler, m);
         if (r < 0) {
                 log_warning_errno(r, "Can't listen to plymouth socket: %m");
                 goto fail;
@@ -285,7 +308,7 @@ static int connect_plymouth(Manager *m) {
         return 0;
 
 fail:
-        on_plymouth_disconnect(m);
+        plymouth_disconnect(m);
         return r;
 }
 
@@ -313,7 +336,7 @@ static int progress_handler(sd_event_source *s, int fd, uint32_t revents, void *
                 /* we got twice the same size from a bad behaving client, kick it off the list */
                 else {
                         log_warning("Closing bad behaving fsck client connection at fd %d", client->fd);
-                        remove_client(&(m->clients), client);
+                        client_free(client);
                         r = update_global_progress(m);
                         if (r < 0)
                                 log_warning_errno(r, "Couldn't update global progress: %m");
@@ -325,7 +348,7 @@ static int progress_handler(sd_event_source *s, int fd, uint32_t revents, void *
         r = recv(fd, &fsck_data, sizeof(FsckProgress), 0);
         if (r == 0) {
                 log_debug("Fsck client connected to fd %d disconnected", client->fd);
-                remove_client(&(m->clients), client);
+                client_free(client);
         } else if (r > 0 && r != sizeof(FsckProgress))
                 log_warning("Unexpected data structure sent to fsckd socket from fd: %d. Ignoring", client->fd);
         else if (r > 0 && r == sizeof(FsckProgress)) {
@@ -369,7 +392,7 @@ static int new_connection_handler(sd_event_source *s, int fd, uint32_t revents,
         LIST_PREPEND(clients, m->clients, client);
         r = sd_event_add_io(m->event, NULL, client->fd, EPOLLIN, progress_handler, client);
         if (r < 0) {
-                remove_client(&(m->clients), client);
+                client_free(client);
                 return r;
         }
         /* only request the client to cancel now in case the request is dropped by the client (chance to recancel) */
@@ -380,7 +403,6 @@ static int new_connection_handler(sd_event_source *s, int fd, uint32_t revents,
 }
 
 static void manager_free(Manager *m) {
-        Client *current = NULL, *l = NULL;
         if (!m)
                 return;
 
@@ -395,13 +417,15 @@ static void manager_free(Manager *m) {
                 fflush(m->console);
         }
 
+        plymouth_disconnect(m);
+
         safe_close(m->connection_fd);
-        safe_close(m->plymouth_fd);
+
         if (m->console)
                 fclose(m->console);
 
-        LIST_FOREACH_SAFE(clients, current, l, m->clients)
-                remove_client(&(m->clients), current);
+        while (m->clients)
+                client_free(m->clients);
 
         sd_event_unref(m->event);