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authorMichael Tokarev <mjt@tls.msk.ru>2014-12-20 08:48:44 +0000
committerMichael Tokarev <mjt@tls.msk.ru>2014-12-20 08:48:44 +0000
commit489bea7ee8e1dbecfa517b8415568044ab57c73a (patch)
tree44d4878d4c7da3f4908ea9a765ef9b8f9c141756 /mdmon.h
mdadm (3.3.2-5) unstable; urgency=medium
* use-tempnode-not-devnode.patch: change udev rules file to use $tempnode which works both on wheezy and jessie udev, instead of $devnode which only works in jessie. At this stage it is better to make rules file compatible with old version instead of adding versioned dependency. Should be removed for jessie+1. (Closes: #770883) * fix Closes: list in previous entry (Closes: #771852) # imported from the archive
Diffstat (limited to 'mdmon.h')
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diff --git a/mdmon.h b/mdmon.h
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+/*
+ * mdmon - monitor external metadata arrays
+ *
+ * Copyright (C) 2007-2009 Neil Brown <neilb@suse.de>
+ * Copyright (C) 2007-2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#undef pr_err
+#define pr_err(fmt ...) fprintf(stderr, "mdmon: " fmt)
+
+enum array_state { clear, inactive, suspended, readonly, read_auto,
+ clean, active, write_pending, active_idle, bad_word};
+
+enum sync_action { idle, reshape, resync, recover, check, repair, bad_action };
+
+struct active_array {
+ struct mdinfo info;
+ struct supertype *container;
+ struct active_array *next, *replaces;
+ int to_remove;
+
+ int action_fd;
+ int resync_start_fd;
+ int metadata_fd; /* for monitoring rw/ro status */
+ int sync_completed_fd; /* for checkpoint notification events */
+ unsigned long long last_checkpoint; /* sync_completed fires for many
+ * reasons this field makes sure the
+ * kernel has made progress before
+ * moving the checkpoint. It is
+ * cleared by the metadata handler
+ * when it determines recovery is
+ * terminated.
+ */
+
+ enum array_state prev_state, curr_state, next_state;
+ enum sync_action prev_action, curr_action, next_action;
+
+ int check_degraded; /* flag set by mon, read by manage */
+ int check_reshape; /* flag set by mon, read by manage */
+};
+
+/*
+ * Metadata updates are handled by the monitor thread,
+ * as it has exclusive access to the metadata.
+ * When the manager want to updates metadata, either
+ * for it's own reason (e.g. committing a spare) or
+ * on behalf of mdadm, it creates a metadata_update
+ * structure and queues it to the monitor.
+ * Updates are created and processed by code under the
+ * superswitch. All common code sees them as opaque
+ * blobs.
+ */
+extern struct metadata_update *update_queue, *update_queue_handled;
+
+#define MD_MAJOR 9
+
+extern struct active_array *container;
+extern struct active_array *discard_this;
+extern struct active_array *pending_discard;
+extern struct md_generic_cmd *active_cmd;
+
+void remove_pidfile(char *devname);
+void do_monitor(struct supertype *container);
+void do_manager(struct supertype *container);
+extern int sigterm;
+
+int read_dev_state(int fd);
+int is_container_member(struct mdstat_ent *mdstat, char *container);
+
+struct mdstat_ent *mdstat_read(int hold, int start);
+
+extern int exit_now, manager_ready;
+extern int mon_tid, mgr_tid;
+extern int monitor_loop_cnt;
+
+/* helper routine to determine resync completion since MaxSector is a
+ * moving target
+ */
+static inline int is_resync_complete(struct mdinfo *array)
+{
+ unsigned long long sync_size = 0;
+ int ncopies, l;
+ switch(array->array.level) {
+ case 1:
+ case 4:
+ case 5:
+ case 6:
+ sync_size = array->component_size;
+ break;
+ case 10:
+ l = array->array.layout;
+ ncopies = (l & 0xff) * ((l >> 8) && 0xff);
+ sync_size = array->component_size * array->array.raid_disks;
+ sync_size /= ncopies;
+ break;
+ }
+ return array->resync_start >= sync_size;
+}