chiark / gitweb /
mount: use libmount to enumerate /proc/self/mountinfo
[elogind.git] / src / core / mount.c
index 8b787f66b09fadcab2bac588bf8a7ad9c148963b..d257925fa7a74d0a9105d5e42556d7ff1d7fc90a 100644 (file)
@@ -24,6 +24,7 @@
 #include <mntent.h>
 #include <sys/epoll.h>
 #include <signal.h>
+#include <libmount.h>
 
 #include "manager.h"
 #include "unit.h"
@@ -437,22 +438,22 @@ static int mount_verify(Mount *m) {
 
         b = unit_has_name(UNIT(m), e);
         if (!b) {
-                log_error_unit(UNIT(m)->id, "%s's Where= setting doesn't match unit name. Refusing.", UNIT(m)->id);
+                log_unit_error(UNIT(m)->id, "%s's Where= setting doesn't match unit name. Refusing.", UNIT(m)->id);
                 return -EINVAL;
         }
 
         if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
-                log_error_unit(UNIT(m)->id, "Cannot create mount unit for API file system %s. Refusing.", m->where);
+                log_unit_error(UNIT(m)->id, "Cannot create mount unit for API file system %s. Refusing.", m->where);
                 return -EINVAL;
         }
 
         if (UNIT(m)->fragment_path && !m->parameters_fragment.what) {
-                log_error_unit(UNIT(m)->id, "%s's What setting is missing. Refusing.", UNIT(m)->id);
+                log_unit_error(UNIT(m)->id, "%s's What setting is missing. Refusing.", UNIT(m)->id);
                 return -EBADMSG;
         }
 
         if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
-                log_error_unit(UNIT(m)->id, "%s has PAM enabled. Kill mode must be set to control-group'. Refusing.",UNIT(m)->id);
+                log_unit_error(UNIT(m)->id, "%s has PAM enabled. Kill mode must be set to control-group'. Refusing.",UNIT(m)->id);
                 return -EINVAL;
         }
 
@@ -597,7 +598,7 @@ static void mount_set_state(Mount *m, MountState state) {
         }
 
         if (state != old_state)
-                log_debug_unit(UNIT(m)->id,
+                log_unit_debug(UNIT(m)->id,
                                "%s changed %s -> %s",
                                UNIT(m)->id,
                                mount_state_to_string(old_state),
@@ -804,7 +805,7 @@ static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
         return;
 
 fail:
-        log_warning_unit(UNIT(m)->id,
+        log_unit_warning(UNIT(m)->id,
                          "%s failed to kill processes: %s", UNIT(m)->id, strerror(-r));
 
         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
@@ -814,31 +815,38 @@ fail:
 }
 
 void warn_if_dir_nonempty(const char *unit, const char* where) {
+        int r;
+
         assert(unit);
         assert(where);
 
-        if (dir_is_empty(where) > 0)
+        r = dir_is_empty(where);
+        if (r > 0)
                 return;
-
-        log_struct_unit(LOG_NOTICE,
-                   unit,
-                   "MESSAGE=%s: Directory %s to mount over is not empty, mounting anyway.",
-                   unit, where,
-                   "WHERE=%s", where,
-                   MESSAGE_ID(SD_MESSAGE_OVERMOUNTING),
-                   NULL);
+        else if (r == 0)
+                log_unit_struct(unit,
+                                LOG_NOTICE,
+                                LOG_MESSAGE_ID(SD_MESSAGE_OVERMOUNTING),
+                                LOG_MESSAGE("%s: Directory %s to mount over is not empty, mounting anyway.",
+                                            unit, where),
+                                "WHERE=%s", where,
+                                NULL);
+        else
+                log_unit_warning(unit,
+                                 "MESSAGE=Failed to check directory %s: %s",
+                                 where, strerror(-r));
 }
 
 static int fail_if_symlink(const char *unit, const char* where) {
         assert(where);
 
         if (is_symlink(where) > 0) {
-                log_struct_unit(LOG_WARNING,
-                                unit,
-                                "MESSAGE=%s: Mount on symlink %s not allowed.",
-                                unit, where,
+                log_unit_struct(unit,
+                                LOG_ERR,
+                                LOG_MESSAGE_ID(SD_MESSAGE_OVERMOUNTING),
+                                LOG_MESSAGE("%s: Mount on symlink %s not allowed.",
+                                            unit, where),
                                 "WHERE=%s", where,
-                                MESSAGE_ID(SD_MESSAGE_OVERMOUNTING),
                                 NULL);
 
                 return -ELOOP;
@@ -872,7 +880,7 @@ static void mount_enter_unmounting(Mount *m) {
         return;
 
 fail:
-        log_warning_unit(UNIT(m)->id,
+        log_unit_warning(UNIT(m)->id,
                          "%s failed to run 'umount' task: %s",
                          UNIT(m)->id, strerror(-r));
         mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
@@ -927,7 +935,7 @@ static void mount_enter_mounting(Mount *m) {
         return;
 
 fail:
-        log_warning_unit(UNIT(m)->id,
+        log_unit_warning(UNIT(m)->id,
                          "%s failed to run 'mount' task: %s",
                          UNIT(m)->id, strerror(-r));
         mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
@@ -975,7 +983,7 @@ static void mount_enter_remounting(Mount *m) {
         return;
 
 fail:
-        log_warning_unit(UNIT(m)->id,
+        log_unit_warning(UNIT(m)->id,
                          "%s failed to run 'remount' task: %s",
                          UNIT(m)->id, strerror(-r));
         m->reload_result = MOUNT_FAILURE_RESOURCES;
@@ -1079,7 +1087,7 @@ static int mount_deserialize_item(Unit *u, const char *key, const char *value, F
                 MountState state;
 
                 if ((state = mount_state_from_string(value)) < 0)
-                        log_debug_unit(u->id, "Failed to parse state value %s", value);
+                        log_unit_debug(u->id, "Failed to parse state value %s", value);
                 else
                         m->deserialized_state = state;
         } else if (streq(key, "result")) {
@@ -1087,7 +1095,7 @@ static int mount_deserialize_item(Unit *u, const char *key, const char *value, F
 
                 f = mount_result_from_string(value);
                 if (f < 0)
-                        log_debug_unit(UNIT(m)->id,
+                        log_unit_debug(UNIT(m)->id,
                                        "Failed to parse result value %s", value);
                 else if (f != MOUNT_SUCCESS)
                         m->result = f;
@@ -1097,7 +1105,7 @@ static int mount_deserialize_item(Unit *u, const char *key, const char *value, F
 
                 f = mount_result_from_string(value);
                 if (f < 0)
-                        log_debug_unit(UNIT(m)->id,
+                        log_unit_debug(UNIT(m)->id,
                                        "Failed to parse reload result value %s", value);
                 else if (f != MOUNT_SUCCESS)
                         m->reload_result = f;
@@ -1106,7 +1114,7 @@ static int mount_deserialize_item(Unit *u, const char *key, const char *value, F
                 pid_t pid;
 
                 if (parse_pid(value, &pid) < 0)
-                        log_debug_unit(UNIT(m)->id,
+                        log_unit_debug(UNIT(m)->id,
                                        "Failed to parse control-pid value %s", value);
                 else
                         m->control_pid = pid;
@@ -1114,14 +1122,14 @@ static int mount_deserialize_item(Unit *u, const char *key, const char *value, F
                 MountExecCommand id;
 
                 if ((id = mount_exec_command_from_string(value)) < 0)
-                        log_debug_unit(UNIT(m)->id,
+                        log_unit_debug(UNIT(m)->id,
                                        "Failed to parse exec-command value %s", value);
                 else {
                         m->control_command_id = id;
                         m->control_command = m->exec_command + id;
                 }
         } else
-                log_debug_unit(UNIT(m)->id,
+                log_unit_debug(UNIT(m)->id,
                                "Unknown serialization key '%s'", key);
 
         return 0;
@@ -1180,7 +1188,8 @@ static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
         }
 
-        log_full_unit(f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE, u->id,
+        log_unit_full(u->id,
+                      f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
                       "%s mount process exited, code=%s status=%i",
                       u->id, sigchld_code_to_string(code), status);
 
@@ -1248,31 +1257,31 @@ static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *user
 
         case MOUNT_MOUNTING:
         case MOUNT_MOUNTING_DONE:
-                log_warning_unit(UNIT(m)->id,
+                log_unit_warning(UNIT(m)->id,
                                  "%s mounting timed out. Stopping.", UNIT(m)->id);
                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
                 break;
 
         case MOUNT_REMOUNTING:
-                log_warning_unit(UNIT(m)->id,
+                log_unit_warning(UNIT(m)->id,
                                  "%s remounting timed out. Stopping.", UNIT(m)->id);
                 m->reload_result = MOUNT_FAILURE_TIMEOUT;
                 mount_enter_mounted(m, MOUNT_SUCCESS);
                 break;
 
         case MOUNT_UNMOUNTING:
-                log_warning_unit(UNIT(m)->id,
+                log_unit_warning(UNIT(m)->id,
                                  "%s unmounting timed out. Stopping.", UNIT(m)->id);
                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
                 break;
 
         case MOUNT_MOUNTING_SIGTERM:
                 if (m->kill_context.send_sigkill) {
-                        log_warning_unit(UNIT(m)->id,
+                        log_unit_warning(UNIT(m)->id,
                                          "%s mounting timed out. Killing.", UNIT(m)->id);
                         mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
                 } else {
-                        log_warning_unit(UNIT(m)->id,
+                        log_unit_warning(UNIT(m)->id,
                                          "%s mounting timed out. Skipping SIGKILL. Ignoring.",
                                          UNIT(m)->id);
 
@@ -1285,11 +1294,11 @@ static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *user
 
         case MOUNT_REMOUNTING_SIGTERM:
                 if (m->kill_context.send_sigkill) {
-                        log_warning_unit(UNIT(m)->id,
+                        log_unit_warning(UNIT(m)->id,
                                          "%s remounting timed out. Killing.", UNIT(m)->id);
                         mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
                 } else {
-                        log_warning_unit(UNIT(m)->id,
+                        log_unit_warning(UNIT(m)->id,
                                          "%s remounting timed out. Skipping SIGKILL. Ignoring.",
                                          UNIT(m)->id);
 
@@ -1302,11 +1311,11 @@ static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *user
 
         case MOUNT_UNMOUNTING_SIGTERM:
                 if (m->kill_context.send_sigkill) {
-                        log_warning_unit(UNIT(m)->id,
+                        log_unit_warning(UNIT(m)->id,
                                          "%s unmounting timed out. Killing.", UNIT(m)->id);
                         mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
                 } else {
-                        log_warning_unit(UNIT(m)->id,
+                        log_unit_warning(UNIT(m)->id,
                                          "%s unmounting timed out. Skipping SIGKILL. Ignoring.",
                                          UNIT(m)->id);
 
@@ -1320,7 +1329,7 @@ static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *user
         case MOUNT_MOUNTING_SIGKILL:
         case MOUNT_REMOUNTING_SIGKILL:
         case MOUNT_UNMOUNTING_SIGKILL:
-                log_warning_unit(UNIT(m)->id,
+                log_unit_warning(UNIT(m)->id,
                                  "%s mount process still around after SIGKILL. Ignoring.",
                                  UNIT(m)->id);
 
@@ -1492,55 +1501,47 @@ fail:
         return r;
 }
 
+static inline void mnt_free_table_p(struct libmnt_table **tb) {
+        mnt_free_table(*tb);
+}
+
+static inline void mnt_free_iter_p(struct libmnt_iter **itr) {
+        mnt_free_iter(*itr);
+}
+
 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
+        _cleanup_(mnt_free_table_p) struct libmnt_table *tb = NULL;
+        _cleanup_(mnt_free_iter_p) struct libmnt_iter *itr = NULL;
+        struct libmnt_fs *fs;
         int r = 0;
-        unsigned i;
 
         assert(m);
 
-        rewind(m->proc_self_mountinfo);
+        tb = mnt_new_table();
+        itr = mnt_new_iter(MNT_ITER_FORWARD);
+        if (!tb || !itr)
+                return log_oom();
 
-        for (i = 1;; i++) {
-                _cleanup_free_ char *device = NULL, *path = NULL, *options = NULL, *options2 = NULL, *fstype = NULL, *d = NULL, *p = NULL, *o = NULL;
-                int k;
+        mnt_table_parse_mtab(tb, NULL);
+        if (r)
+                return r;
 
-                k = fscanf(m->proc_self_mountinfo,
-                           "%*s "       /* (1) mount id */
-                           "%*s "       /* (2) parent id */
-                           "%*s "       /* (3) major:minor */
-                           "%*s "       /* (4) root */
-                           "%ms "       /* (5) mount point */
-                           "%ms"        /* (6) mount options */
-                           "%*[^-]"     /* (7) optional fields */
-                           "- "         /* (8) separator */
-                           "%ms "       /* (9) file system type */
-                           "%ms"        /* (10) mount source */
-                           "%ms"        /* (11) mount options 2 */
-                           "%*[^\n]",   /* some rubbish at the end */
-                           &path,
-                           &options,
-                           &fstype,
-                           &device,
-                           &options2);
-
-                if (k == EOF)
-                        break;
-
-                if (k != 5) {
-                        log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
-                        continue;
-                }
+        while (mnt_table_next_fs(tb, itr, &fs) == 0) {
+                const char *device, *path, *options, *fstype;
+                _cleanup_free_ const char *d = NULL, *p = NULL;
+                int k;
 
-                o = strjoin(options, ",", options2, NULL);
-                if (!o)
-                        return log_oom();
+                device = mnt_fs_get_source(fs);
+                path = mnt_fs_get_target(fs);
+                options = mnt_fs_get_options(fs);
+                fstype = mnt_fs_get_fstype(fs);
 
                 d = cunescape(device);
                 p = cunescape(path);
                 if (!d || !p)
                         return log_oom();
 
-                k = mount_add_one(m, d, p, o, fstype, set_flags);
+                k = mount_add_one(m, d, p, options, fstype, set_flags);
                 if (k < 0)
                         r = k;
         }
@@ -1577,6 +1578,8 @@ static int mount_enumerate(Manager *m) {
         int r;
         assert(m);
 
+        mnt_init_debug(0);
+
         if (!m->proc_self_mountinfo) {
                 m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
                 if (!m->proc_self_mountinfo)
@@ -1619,7 +1622,7 @@ static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents,
 
         r = mount_load_proc_self_mountinfo(m, true);
         if (r < 0) {
-                log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
+                log_error_errno(r, "Failed to reread /proc/self/mountinfo: %m");
 
                 /* Reset flags, just in case, for later calls */
                 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {