[thirdparty/mdadm.git] / managemon.c


/*
 * The management thread for monitoring active md arrays.
 * This thread does things which might block such as memory
 * allocation.
 * In particular:
 *
 * - Find out about new arrays in this container.
 *   Allocate the data structures and open the files.
 *
 *   For this we watch /proc/mdstat and find new arrays with
 *   metadata type that confirms sharing. e.g. "md4"
 *   When we find a new array we slip it into the list of
 *   arrays and signal 'monitor' by writing to a pipe.
 *
 * - Respond to reshape requests by allocating new data structures
 *   and opening new files.
 *
 *   These come as a change to raid_disks.  We allocate a new
 *   version of the data structures and slip it into the list.
 *   'monitor' will notice and release the old version.
 *   Changes to level, chunksize, layout.. do not need re-allocation.
 *   Reductions in raid_disks don't really either, but we handle
 *   them the same way for consistency.
 *
 * - When a device is added to the container, we add it to the metadata
 *   as a spare.
 *
 * - Deal with degraded array
 *    We only do this when first noticing the array is degraded.
 *    This can be when we first see the array, when sync completes or
 *    when recovery completes.
 *
 *    Check if number of failed devices suggests recovery is needed, and
 *    skip if not.
 *    Ask metadata to allocate a spare device
 *    Add device as not in_sync and give a role
 *    Update metadata.
 *    Open sysfs files and pass to monitor.
 *    Make sure that monitor Starts recovery....
 *
 * - Pass on metadata updates from external programs such as
 *   mdadm creating a new array.
 *
 *   This is most-messy.
 *   It might involve adding a new array or changing the status of
 *   a spare, or any reconfig that the kernel doesn't get involved in.
 *
 *   The required updates are received via a named pipe.  There will
 *   be one named pipe for each container. Each message contains a
 *   sync marker: 0x5a5aa5a5, A byte count, and the message.  This is
 *   passed to the metadata handler which will interpret and process it.
 *   For 'DDF' messages are internal data blocks with the leading
 *   'magic number' signifying what sort of data it is.
 *
 */

/*
 * We select on /proc/mdstat and the named pipe.
 * We create new arrays or updated version of arrays and slip
 * them into the head of the list, then signal 'monitor' via a pipe write.
 * 'monitor' will notice and place the old array on a return list.
 * Metadata updates are placed on a queue just like they arrive
 * from the named pipe.
 *
 * When new arrays are found based on correct metadata string, we
 * need to identify them with an entry in the metadata.  Maybe we require
 * the metadata to be mdX/NN  when NN is the index into an appropriate table.
 *
 */

/*
 * List of tasks:
 * - Watch for spares to be added to the container, and write updated
 *   metadata to them.
 * - Watch for new arrays using this container, confirm they match metadata
 *   and if so, start monitoring them
 * - Watch for spares being added to monitored arrays.  This shouldn't
 *   happen, as we should do all the adding.  Just remove them.
 * - Watch for change in raid-disks, chunk-size, etc.  Update metadata and
 *   start a reshape.
 */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include	"mdadm.h"
#include	"mdmon.h"
#include	<sys/socket.h>
#include	<signal.h>

static void close_aa(struct active_array *aa)
{
	struct mdinfo *d;

	for (d = aa->info.devs; d; d = d->next)
		close(d->state_fd);

	close(aa->action_fd);
	close(aa->info.state_fd);
	close(aa->resync_start_fd);
}

static void free_aa(struct active_array *aa)
{
	/* Note that this doesn't close fds if they are being used
	 * by a clone.  ->container will be set for a clone
	 */
	if (!aa->container)
		close_aa(aa);
	while (aa->info.devs) {
		struct mdinfo *d = aa->info.devs;
		aa->info.devs = d->next;
		free(d);
	}
	free(aa);
}

static struct active_array *duplicate_aa(struct active_array *aa)
{
	struct active_array *newa = malloc(sizeof(*newa));
	struct mdinfo **dp1, **dp2;

	*newa = *aa;
	newa->next = NULL;
	newa->replaces = NULL;
	newa->info.next = NULL;

	dp2 = &newa->info.devs;

	for (dp1 = &aa->info.devs; *dp1; dp1 = &(*dp1)->next) {
		struct mdinfo *d;
		if ((*dp1)->state_fd < 0)
			continue;

		d = malloc(sizeof(*d));
		*d = **dp1;
		*dp2 = d;
		dp2 = & d->next;
	}
	*dp2 = NULL;

	return newa;
}

static void write_wakeup(struct supertype *c)
{
	static struct md_generic_cmd cmd = { .action = md_action_ping_monitor };
	int err;

	active_cmd = &cmd;

	/* send the monitor thread a pointer to the ping action */
	write(c->mgr_pipe[1], &err, 1);
	read(c->mon_pipe[0], &err, 1);
}

static void remove_old(void)
{
	if (discard_this) {
		discard_this->next = NULL;
		free_aa(discard_this);
		if (pending_discard == discard_this)
			pending_discard = NULL;
		discard_this = NULL;
	}
}

static void replace_array(struct supertype *container,
			  struct active_array *old,
			  struct active_array *new)
{
	/* To replace an array, we add it to the top of the list
	 * marked with ->replaces to point to the original.
	 * 'monitor' will take the original out of the list
	 * and put it on 'discard_this'.  We take it from there
	 * and discard it.
	 */
	remove_old();
	while (pending_discard) {
		write_wakeup(container);
		while (discard_this == NULL)
			sleep(1);
		remove_old();
	}
	pending_discard = old;
	new->replaces = old;
	new->next = container->arrays;
	container->arrays = new;
	write_wakeup(container);
}

struct metadata_update *update_queue = NULL;
struct metadata_update *update_queue_handled = NULL;
struct metadata_update *update_queue_pending = NULL;

void check_update_queue(struct supertype *container)
{
	while (update_queue_handled) {
		struct metadata_update *this = update_queue_handled;
		update_queue_handled = this->next;
//		free(this->buf);
		free(this);
	}
	if (update_queue == NULL &&
	    update_queue_pending) {
		update_queue = update_queue_pending;
		update_queue_pending = NULL;
		write_wakeup(container);
	}
}

static void queue_metadata_update(struct metadata_update *mu)
{
	struct metadata_update **qp;

	qp = &update_queue_pending;
	while (*qp)
		qp = & ((*qp)->next);
	*qp = mu;
}

void wait_update_handled(void)
{
	/* Wait for any pending update to be handled by monitor.
	 * i.e. wait until update_queue is NULL
	 */
	while (update_queue)
		usleep(100 * 1000);
}

static void manage_container(struct mdstat_ent *mdstat,
			     struct supertype *container)
{
	/* The only thing of interest here is if a new device
	 * has been added to the container.  We add it to the
	 * array ignoring any metadata on it.
	 * FIXME should we look for compatible metadata and take hints
	 * about spare assignment.... probably not.
	 */
	if (mdstat->devcnt != container->devcnt) {
		/* read /sys/block/NAME/md/dev-??/block/dev to find out
		 * what is there, and compare with container->info.devs
		 * To see what is removed and what is added.
		 * These need to be remove from, or added to, the array
		 */
		// FIXME
		container->devcnt = mdstat->devcnt;
	}
}

static void manage_member(struct mdstat_ent *mdstat,
			  struct active_array *a)
{
	/* Compare mdstat info with known state of member array.
	 * We do not need to look for device state changes here, that
	 * is dealt with by the monitor.
	 *
	 * We just look for changes which suggest that a reshape is
	 * being requested.
	 * Unfortunately decreases in raid_disks don't show up in
	 * mdstat until the reshape completes FIXME.
	 *
	 * Actually, we also want to handle degraded arrays here by
	 * trying to find and assign a spare.
	 * We do that whenever the monitor tells us too.
	 */
	// FIXME
	a->info.array.raid_disks = mdstat->raid_disks;
	a->info.array.chunk_size = mdstat->chunk_size;
	// MORE

	if (a->check_degraded) {
		struct metadata_update *updates = NULL;
		struct mdinfo *newdev;
		struct active_array *newa;
		wait_update_handled();
		a->check_degraded = 0;

		/* The array may not be degraded, this is just a good time
		 * to check.
		 */
		newdev = a->container->ss->activate_spare(a, &updates);
		if (newdev) {
			struct mdinfo *d;
			/* Cool, we can add a device or several. */
			newa = duplicate_aa(a);
			/* suspend recovery - maybe not needed */

			/* Add device to array and set offset/size/slot.
			 * and open files for each newdev */
			for (d = newdev; d ; d = d->next) {
				struct mdinfo *newd;
				if (sysfs_add_disk(&newa->info, d))
					continue;
				newd = newa->info.devs;
				newd->state_fd = sysfs_open(a->devnum,
							    newd->sys_name,
							    "state");
				newd->prev_state
					= read_dev_state(newd->state_fd);
				newd->curr_state = newd->prev_state;
			}
			queue_metadata_update(updates);
			replace_array(a->container, a, newa);
			sysfs_set_str(&a->info, NULL, "sync_action", "repair");
		}
	}
}

static void manage_new(struct mdstat_ent *mdstat,
		       struct supertype *container,
		       struct active_array *victim)
{
	/* A new array has appeared in this container.
	 * Hopefully it is already recorded in the metadata.
	 * Check, then create the new array to report it to
	 * the monitor.
	 */

	struct active_array *new;
	struct mdinfo *mdi, *di;
	char *inst;
	int i;

	new = malloc(sizeof(*new));

	memset(new, 0, sizeof(*new));

	new->devnum = mdstat->devnum;
	strcpy(new->info.sys_name, devnum2devname(new->devnum));

	new->prev_state = new->curr_state = new->next_state = inactive;
	new->prev_action= new->curr_action= new->next_action= idle;

	new->container = container;

	inst = &mdstat->metadata_version[10+strlen(container->devname)+1];

	mdi = sysfs_read(-1, new->devnum,
			 GET_LEVEL|GET_CHUNK|GET_DISKS|
			 GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE);
	if (!mdi) {
		/* Eeek. Cannot monitor this array.
		 * Mark it to be ignored by setting container to NULL
		 */
		new->container = NULL;
		replace_array(container, victim, new);
		return;
	}

	new->info.array = mdi->array;

	for (i = 0; i < new->info.array.raid_disks; i++) {
		struct mdinfo *newd = malloc(sizeof(*newd));

		for (di = mdi->devs; di; di = di->next)
			if (i == di->disk.raid_disk)
				break;

		if (di) {
			memcpy(newd, di, sizeof(*newd));

			newd->state_fd = sysfs_open(new->devnum,
						    newd->sys_name,
						    "state");

			newd->prev_state = read_dev_state(newd->state_fd);
			newd->curr_state = newd->prev_state;
		} else {
			newd->state_fd = -1;
			newd->disk.raid_disk = i;
			newd->prev_state = DS_REMOVE;
			newd->curr_state = DS_REMOVE;
		}
		sprintf(newd->sys_name, "rd%d", i);
		newd->next = new->info.devs;
		new->info.devs = newd;
	}
	new->action_fd = sysfs_open(new->devnum, NULL, "sync_action");
	new->info.state_fd = sysfs_open(new->devnum, NULL, "array_state");
	new->resync_start_fd = sysfs_open(new->devnum, NULL, "resync_start");
	new->resync_start = 0;

	sysfs_free(mdi);
	// finds and compares.
	if (container->ss->open_new(container, new, inst) < 0) {
		// FIXME close all those files
		new->container = NULL;
		replace_array(container, victim, new);
		return;
	}
	replace_array(container, victim, new);
	return;
}

void manage(struct mdstat_ent *mdstat, struct supertype *container)
{
	/* We have just read mdstat and need to compare it with
	 * the known active arrays.
	 * Arrays with the wrong metadata are ignored.
	 */

	for ( ; mdstat ; mdstat = mdstat->next) {
		struct active_array *a;
		if (mdstat->devnum == container->devnum) {
			manage_container(mdstat, container);
			continue;
		}
		if (mdstat->metadata_version == NULL ||
		    strncmp(mdstat->metadata_version, "external:/", 10) != 0 ||
		    strncmp(mdstat->metadata_version+10, container->devname,
			    strlen(container->devname)) != 0 ||
		    mdstat->metadata_version[10+strlen(container->devname)]
		      != '/')
			/* Not for this array */
			continue;
		/* Looks like a member of this container */
		for (a = container->arrays; a; a = a->next) {
			if (mdstat->devnum == a->devnum) {
				if (a->container)
					manage_member(mdstat, a);
				break;
			}
		}
		if (a == NULL || !a->container)
			manage_new(mdstat, container, a);
	}
}

static int handle_message(struct supertype *container, struct md_message *msg)
{
	int err;
	struct md_generic_cmd *cmd = msg->buf;

	if (!cmd)
		return 0;

	switch (cmd->action) {
	case md_action_remove_device:

		/* forward to the monitor */
		active_cmd = cmd;
		write(container->mgr_pipe[1], &err, 1);
		read(container->mon_pipe[0], &err, 1);
		return err;

	default:
		return -1;
	}
}

void read_sock(struct supertype *container)
{
	int fd;
	struct md_message msg;
	int terminate = 0;
	long fl;
	int tmo = 3; /* 3 second timeout before hanging up the socket */

	fd = accept(container->sock, NULL, NULL);
	if (fd < 0)
		return;

	fl = fcntl(fd, F_GETFL, 0);
	fl |= O_NONBLOCK;
	fcntl(fd, F_SETFL, fl);

	do {
		int err;

		msg.buf = NULL;

		/* read and validate the message */
		if (receive_message(fd, &msg, tmo) == 0) {
			err = handle_message(container, &msg);
			if (!err)
				ack(fd, msg.seq, tmo);
			else
				nack(fd, err, tmo);
		} else {
			terminate = 1;
			nack(fd, -1, tmo);
		}

		if (msg.buf)
			free(msg.buf);
	} while (!terminate);

	close(fd);
}

static int woke = 0;
void wake_me(int sig)
{
	woke = 1;
}

int exit_now = 0;
int manager_ready = 0;
void do_manager(struct supertype *container)
{
	struct mdstat_ent *mdstat;
	sigset_t block, orig;

	sigemptyset(&block);
	sigaddset(&block, SIGUSR1);

	signal(SIGUSR1, wake_me);

	do {
		woke = 0;

		if (exit_now)
			exit(0);

		mdstat = mdstat_read(1, 0);

		manage(mdstat, container);

		read_sock(container);

		free_mdstat(mdstat);

		remove_old();

		check_update_queue(container);

		manager_ready = 1;
		sigprocmask(SIG_SETMASK, &block, &orig);
		if (woke == 0)
			mdstat_wait_fd(container->sock, &orig);
		sigprocmask(SIG_SETMASK, &orig, NULL);
	} while(1);
}
Commit	Line	Data
549e9569 NB	1
	2	/*
	3	* The management thread for monitoring active md arrays.
	4	* This thread does things which might block such as memory
	5	* allocation.
	6	* In particular:
	7	*
	8	* - Find out about new arrays in this container.
	9	* Allocate the data structures and open the files.
	10	*
	11	* For this we watch /proc/mdstat and find new arrays with
	12	* metadata type that confirms sharing. e.g. "md4"
	13	* When we find a new array we slip it into the list of
	14	* arrays and signal 'monitor' by writing to a pipe.
	15	*
	16	* - Respond to reshape requests by allocating new data structures
	17	* and opening new files.
	18	*
	19	* These come as a change to raid_disks. We allocate a new
	20	* version of the data structures and slip it into the list.
	21	* 'monitor' will notice and release the old version.
	22	* Changes to level, chunksize, layout.. do not need re-allocation.
	23	* Reductions in raid_disks don't really either, but we handle
	24	* them the same way for consistency.
	25	*
	26	* - When a device is added to the container, we add it to the metadata
	27	* as a spare.
	28	*
6c3fb95c NB	29	* - Deal with degraded array
	30	* We only do this when first noticing the array is degraded.
	31	* This can be when we first see the array, when sync completes or
	32	* when recovery completes.
	33	*
	34	* Check if number of failed devices suggests recovery is needed, and
	35	* skip if not.
	36	* Ask metadata to allocate a spare device
	37	* Add device as not in_sync and give a role
	38	* Update metadata.
	39	* Open sysfs files and pass to monitor.
	40	* Make sure that monitor Starts recovery....
549e9569 NB	41	*
	42	* - Pass on metadata updates from external programs such as
	43	* mdadm creating a new array.
	44	*
	45	* This is most-messy.
	46	* It might involve adding a new array or changing the status of
	47	* a spare, or any reconfig that the kernel doesn't get involved in.
	48	*
	49	* The required updates are received via a named pipe. There will
	50	* be one named pipe for each container. Each message contains a
	51	* sync marker: 0x5a5aa5a5, A byte count, and the message. This is
	52	* passed to the metadata handler which will interpret and process it.
	53	* For 'DDF' messages are internal data blocks with the leading
	54	* 'magic number' signifying what sort of data it is.
	55	*
	56	*/
	57
	58	/*
	59	* We select on /proc/mdstat and the named pipe.
	60	* We create new arrays or updated version of arrays and slip
	61	* them into the head of the list, then signal 'monitor' via a pipe write.
	62	* 'monitor' will notice and place the old array on a return list.
	63	* Metadata updates are placed on a queue just like they arrive
	64	* from the named pipe.
	65	*
	66	* When new arrays are found based on correct metadata string, we
	67	* need to identify them with an entry in the metadata. Maybe we require
	68	* the metadata to be mdX/NN when NN is the index into an appropriate table.
	69	*
	70	*/
	71
	72	/*
	73	* List of tasks:
	74	* - Watch for spares to be added to the container, and write updated
	75	* metadata to them.
	76	* - Watch for new arrays using this container, confirm they match metadata
	77	* and if so, start monitoring them
	78	* - Watch for spares being added to monitored arrays. This shouldn't
	79	* happen, as we should do all the adding. Just remove them.
	80	* - Watch for change in raid-disks, chunk-size, etc. Update metadata and
	81	* start a reshape.
	82	*/
	83	#ifndef _GNU_SOURCE
	84	#define _GNU_SOURCE
	85	#endif
	86	#include "mdadm.h"
	87	#include "mdmon.h"
	88	#include <sys/socket.h>
1ed3f387	89	#include <signal.h>
549e9569	90
2a0bb19e DW	91	static void close_aa(struct active_array *aa)
	92	{
	93	struct mdinfo *d;
	94
	95	for (d = aa->info.devs; d; d = d->next)
	96	close(d->state_fd);
	97
	98	close(aa->action_fd);
	99	close(aa->info.state_fd);
	100	close(aa->resync_start_fd);
2a0bb19e DW	101	}
2a0bb19e DW	102
549e9569 NB	103	static void free_aa(struct active_array *aa)
549e9569 NB	104	{
2a0bb19e DW	105	/* Note that this doesn't close fds if they are being used
2a0bb19e DW	106	* by a clone. ->container will be set for a clone
549e9569	107	*/
2a0bb19e DW	108	if (!aa->container)
2a0bb19e DW	109	close_aa(aa);
549e9569 NB	110	while (aa->info.devs) {
	111	struct mdinfo *d = aa->info.devs;
	112	aa->info.devs = d->next;
	113	free(d);
	114	}
	115	free(aa);
	116	}
	117
6c3fb95c NB	118	static struct active_array duplicate_aa(struct active_array aa)
	119	{
	120	struct active_array newa = malloc(sizeof(newa));
	121	struct mdinfo dp1, dp2;
	122
	123	newa = aa;
	124	newa->next = NULL;
	125	newa->replaces = NULL;
	126	newa->info.next = NULL;
	127
	128	dp2 = &newa->info.devs;
	129
	130	for (dp1 = &aa->info.devs; dp1; dp1 = &(dp1)->next) {
	131	struct mdinfo *d;
	132	if ((*dp1)->state_fd < 0)
	133	continue;
	134
	135	d = malloc(sizeof(*d));
	136	d = *dp1;
	137	*dp2 = d;
	138	dp2 = & d->next;
	139	}
7e1432fb	140	*dp2 = NULL;
6c3fb95c NB	141
	142	return newa;
	143	}
	144
2a0bb19e DW	145	static void write_wakeup(struct supertype *c)
2a0bb19e DW	146	{
3e70c845 DW	147	static struct md_generic_cmd cmd = { .action = md_action_ping_monitor };
	148	int err;
	149
	150	active_cmd = &cmd;
	151
	152	/* send the monitor thread a pointer to the ping action */
	153	write(c->mgr_pipe[1], &err, 1);
	154	read(c->mon_pipe[0], &err, 1);
2a0bb19e DW	155	}
2a0bb19e DW	156
1ed3f387 NB	157	static void remove_old(void)
	158	{
	159	if (discard_this) {
	160	discard_this->next = NULL;
	161	free_aa(discard_this);
	162	if (pending_discard == discard_this)
	163	pending_discard = NULL;
	164	discard_this = NULL;
	165	}
	166	}
	167
549e9569 NB	168	static void replace_array(struct supertype *container,
	169	struct active_array *old,
	170	struct active_array *new)
	171	{
	172	/* To replace an array, we add it to the top of the list
	173	* marked with ->replaces to point to the original.
	174	* 'monitor' will take the original out of the list
	175	* and put it on 'discard_this'. We take it from there
	176	* and discard it.
	177	*/
1ed3f387	178	remove_old();
549e9569	179	while (pending_discard) {
1ed3f387	180	write_wakeup(container);
549e9569 NB	181	while (discard_this == NULL)
549e9569 NB	182	sleep(1);
1ed3f387	183	remove_old();
549e9569 NB	184	}
	185	pending_discard = old;
	186	new->replaces = old;
	187	new->next = container->arrays;
	188	container->arrays = new;
2a0bb19e	189	write_wakeup(container);
549e9569 NB	190	}
549e9569 NB	191
2e735d19 NB	192	struct metadata_update *update_queue = NULL;
	193	struct metadata_update *update_queue_handled = NULL;
	194	struct metadata_update *update_queue_pending = NULL;
	195
	196	void check_update_queue(struct supertype *container)
	197	{
	198	while (update_queue_handled) {
	199	struct metadata_update *this = update_queue_handled;
	200	update_queue_handled = this->next;
7e1432fb	201	// free(this->buf);
2e735d19 NB	202	free(this);
	203	}
	204	if (update_queue == NULL &&
	205	update_queue_pending) {
	206	update_queue = update_queue_pending;
	207	update_queue_pending = NULL;
	208	write_wakeup(container);
	209	}
	210	}
	211
6c3fb95c	212	static void queue_metadata_update(struct metadata_update *mu)
2e735d19 NB	213	{
	214	struct metadata_update **qp;
	215
	216	qp = &update_queue_pending;
	217	while (*qp)
	218	qp = & ((*qp)->next);
	219	*qp = mu;
	220	}
	221
	222	void wait_update_handled(void)
	223	{
	224	/* Wait for any pending update to be handled by monitor.
	225	* i.e. wait until update_queue is NULL
	226	*/
	227	while (update_queue)
	228	usleep(100 * 1000);
	229	}
	230
549e9569 NB	231	static void manage_container(struct mdstat_ent *mdstat,
	232	struct supertype *container)
	233	{
	234	/* The only thing of interest here is if a new device
	235	* has been added to the container. We add it to the
	236	* array ignoring any metadata on it.
	237	* FIXME should we look for compatible metadata and take hints
	238	* about spare assignment.... probably not.
549e9569 NB	239	*/
	240	if (mdstat->devcnt != container->devcnt) {
	241	/* read /sys/block/NAME/md/dev-??/block/dev to find out
	242	* what is there, and compare with container->info.devs
	243	* To see what is removed and what is added.
	244	* These need to be remove from, or added to, the array
	245	*/
	246	// FIXME
	247	container->devcnt = mdstat->devcnt;
	248	}
	249	}
	250
	251	static void manage_member(struct mdstat_ent *mdstat,
	252	struct active_array *a)
	253	{
	254	/* Compare mdstat info with known state of member array.
	255	* We do not need to look for device state changes here, that
	256	* is dealt with by the monitor.
	257	*
	258	* We just look for changes which suggest that a reshape is
	259	* being requested.
	260	* Unfortunately decreases in raid_disks don't show up in
	261	* mdstat until the reshape completes FIXME.
6c3fb95c NB	262	*
	263	* Actually, we also want to handle degraded arrays here by
	264	* trying to find and assign a spare.
	265	* We do that whenever the monitor tells us too.
549e9569 NB	266	*/
	267	// FIXME
	268	a->info.array.raid_disks = mdstat->raid_disks;
	269	a->info.array.chunk_size = mdstat->chunk_size;
	270	// MORE
	271
6c3fb95c NB	272	if (a->check_degraded) {
	273	struct metadata_update *updates = NULL;
	274	struct mdinfo *newdev;
	275	struct active_array *newa;
	276	wait_update_handled();
	277	a->check_degraded = 0;
	278
	279	/* The array may not be degraded, this is just a good time
	280	* to check.
	281	*/
	282	newdev = a->container->ss->activate_spare(a, &updates);
	283	if (newdev) {
	284	struct mdinfo *d;
	285	/* Cool, we can add a device or several. */
	286	newa = duplicate_aa(a);
	287	/* suspend recovery - maybe not needed */
	288
	289	/* Add device to array and set offset/size/slot.
	290	* and open files for each newdev */
	291	for (d = newdev; d ; d = d->next) {
	292	struct mdinfo *newd;
	293	if (sysfs_add_disk(&newa->info, d))
	294	continue;
	295	newd = newa->info.devs;
	296	newd->state_fd = sysfs_open(a->devnum,
	297	newd->sys_name,
	298	"state");
	299	newd->prev_state
	300	= read_dev_state(newd->state_fd);
	301	newd->curr_state = newd->prev_state;
	302	}
	303	queue_metadata_update(updates);
	304	replace_array(a->container, a, newa);
	305	sysfs_set_str(&a->info, NULL, "sync_action", "repair");
	306	}
	307	}
549e9569 NB	308	}
549e9569 NB	309
549e9569	310	static void manage_new(struct mdstat_ent *mdstat,
2a0bb19e DW	311	struct supertype *container,
2a0bb19e DW	312	struct active_array *victim)
549e9569 NB	313	{
	314	/* A new array has appeared in this container.
	315	* Hopefully it is already recorded in the metadata.
	316	* Check, then create the new array to report it to
	317	* the monitor.
	318	*/
	319
	320	struct active_array *new;
	321	struct mdinfo mdi, di;
cba0191b	322	char *inst;
549e9569 NB	323	int i;
	324
	325	new = malloc(sizeof(*new));
	326
d52690ac NB	327	memset(new, 0, sizeof(*new));
d52690ac NB	328
549e9569	329	new->devnum = mdstat->devnum;
7e1432fb	330	strcpy(new->info.sys_name, devnum2devname(new->devnum));
549e9569 NB	331
	332	new->prev_state = new->curr_state = new->next_state = inactive;
	333	new->prev_action= new->curr_action= new->next_action= idle;
	334
	335	new->container = container;
	336
cba0191b	337	inst = &mdstat->metadata_version[10+strlen(container->devname)+1];
549e9569 NB	338
	339	mdi = sysfs_read(-1, new->devnum,
	340	GET_LEVEL\|GET_CHUNK\|GET_DISKS\|
	341	GET_DEVS\|GET_OFFSET\|GET_SIZE\|GET_STATE);
	342	if (!mdi) {
	343	/* Eeek. Cannot monitor this array.
	344	* Mark it to be ignored by setting container to NULL
	345	*/
	346	new->container = NULL;
2a0bb19e	347	replace_array(container, victim, new);
549e9569 NB	348	return;
	349	}
	350
	351	new->info.array = mdi->array;
	352
	353	for (i = 0; i < new->info.array.raid_disks; i++) {
	354	struct mdinfo newd = malloc(sizeof(newd));
	355
	356	for (di = mdi->devs; di; di = di->next)
	357	if (i == di->disk.raid_disk)
	358	break;
	359
	360	if (di) {
	361	memcpy(newd, di, sizeof(*newd));
	362
549e9569 NB	363	newd->state_fd = sysfs_open(new->devnum,
	364	newd->sys_name,
	365	"state");
	366
	367	newd->prev_state = read_dev_state(newd->state_fd);
6c3fb95c	368	newd->curr_state = newd->prev_state;
549e9569 NB	369	} else {
549e9569 NB	370	newd->state_fd = -1;
7e1432fb NB	371	newd->disk.raid_disk = i;
	372	newd->prev_state = DS_REMOVE;
	373	newd->curr_state = DS_REMOVE;
549e9569	374	}
7e1432fb	375	sprintf(newd->sys_name, "rd%d", i);
549e9569 NB	376	newd->next = new->info.devs;
	377	new->info.devs = newd;
	378	}
	379	new->action_fd = sysfs_open(new->devnum, NULL, "sync_action");
	380	new->info.state_fd = sysfs_open(new->devnum, NULL, "array_state");
c052ba30	381	new->resync_start_fd = sysfs_open(new->devnum, NULL, "resync_start");
77402e51	382	new->resync_start = 0;
549e9569	383
4fa5aef9	384	sysfs_free(mdi);
549e9569 NB	385	// finds and compares.
	386	if (container->ss->open_new(container, new, inst) < 0) {
	387	// FIXME close all those files
	388	new->container = NULL;
2a0bb19e	389	replace_array(container, victim, new);
549e9569 NB	390	return;
549e9569 NB	391	}
2a0bb19e	392	replace_array(container, victim, new);
549e9569 NB	393	return;
	394	}
	395
5d19760d	396	void manage(struct mdstat_ent mdstat, struct supertype container)
549e9569 NB	397	{
	398	/* We have just read mdstat and need to compare it with
	399	* the known active arrays.
	400	* Arrays with the wrong metadata are ignored.
	401	*/
	402
	403	for ( ; mdstat ; mdstat = mdstat->next) {
	404	struct active_array *a;
	405	if (mdstat->devnum == container->devnum) {
	406	manage_container(mdstat, container);
	407	continue;
	408	}
	409	if (mdstat->metadata_version == NULL \|\|
	410	strncmp(mdstat->metadata_version, "external:/", 10) != 0 \|\|
	411	strncmp(mdstat->metadata_version+10, container->devname,
	412	strlen(container->devname)) != 0 \|\|
	413	mdstat->metadata_version[10+strlen(container->devname)]
	414	!= '/')
	415	/* Not for this array */
	416	continue;
	417	/* Looks like a member of this container */
5d19760d	418	for (a = container->arrays; a; a = a->next) {
549e9569 NB	419	if (mdstat->devnum == a->devnum) {
	420	if (a->container)
	421	manage_member(mdstat, a);
	422	break;
	423	}
	424	}
2a0bb19e DW	425	if (a == NULL \|\| !a->container)
2a0bb19e DW	426	manage_new(mdstat, container, a);
549e9569 NB	427	}
	428	}
	429
3e70c845 DW	430	static int handle_message(struct supertype container, struct md_message msg)
	431	{
	432	int err;
	433	struct md_generic_cmd *cmd = msg->buf;
	434
	435	if (!cmd)
	436	return 0;
	437
	438	switch (cmd->action) {
	439	case md_action_remove_device:
	440
	441	/* forward to the monitor */
	442	active_cmd = cmd;
	443	write(container->mgr_pipe[1], &err, 1);
	444	read(container->mon_pipe[0], &err, 1);
	445	return err;
	446
	447	default:
	448	return -1;
	449	}
	450	}
	451
	452	void read_sock(struct supertype *container)
549e9569 NB	453	{
549e9569 NB	454	int fd;
b109d928 DW	455	struct md_message msg;
	456	int terminate = 0;
	457	long fl;
	458	int tmo = 3; /* 3 second timeout before hanging up the socket */
549e9569	459
3e70c845	460	fd = accept(container->sock, NULL, NULL);
549e9569 NB	461	if (fd < 0)
549e9569 NB	462	return;
b109d928 DW	463
	464	fl = fcntl(fd, F_GETFL, 0);
	465	fl \|= O_NONBLOCK;
	466	fcntl(fd, F_SETFL, fl);
	467
	468	do {
3e70c845 DW	469	int err;
3e70c845 DW	470
b109d928 DW	471	msg.buf = NULL;
	472
	473	/* read and validate the message */
	474	if (receive_message(fd, &msg, tmo) == 0) {
3e70c845 DW	475	err = handle_message(container, &msg);
	476	if (!err)
	477	ack(fd, msg.seq, tmo);
	478	else
	479	nack(fd, err, tmo);
b109d928 DW	480	} else {
	481	terminate = 1;
	482	nack(fd, -1, tmo);
	483	}
	484
	485	if (msg.buf)
	486	free(msg.buf);
	487	} while (!terminate);
	488
549e9569 NB	489	close(fd);
549e9569 NB	490	}
1ed3f387 NB	491
	492	static int woke = 0;
	493	void wake_me(int sig)
	494	{
	495	woke = 1;
	496	}
	497
e0d6609f NB	498	int exit_now = 0;
e0d6609f NB	499	int manager_ready = 0;
549e9569 NB	500	void do_manager(struct supertype *container)
	501	{
	502	struct mdstat_ent *mdstat;
1ed3f387 NB	503	sigset_t block, orig;
	504
	505	sigemptyset(&block);
	506	sigaddset(&block, SIGUSR1);
	507
	508	signal(SIGUSR1, wake_me);
549e9569 NB	509
549e9569 NB	510	do {
1ed3f387 NB	511	woke = 0;
1ed3f387 NB	512
e0d6609f NB	513	if (exit_now)
	514	exit(0);
	515
549e9569 NB	516	mdstat = mdstat_read(1, 0);
549e9569 NB	517
5d19760d	518	manage(mdstat, container);
549e9569	519
3e70c845	520	read_sock(container);
549e9569	521
4fa5aef9 DW	522	free_mdstat(mdstat);
4fa5aef9 DW	523
1ed3f387 NB	524	remove_old();
1ed3f387 NB	525
2e735d19 NB	526	check_update_queue(container);
2e735d19 NB	527
e0d6609f	528	manager_ready = 1;
1ed3f387 NB	529	sigprocmask(SIG_SETMASK, &block, &orig);
	530	if (woke == 0)
	531	mdstat_wait_fd(container->sock, &orig);
	532	sigprocmask(SIG_SETMASK, &orig, NULL);
549e9569 NB	533	} while(1);
549e9569 NB	534	}