[thirdparty/mdadm.git] / mdstat.c

/*
 * mdstat - parse /proc/mdstat file. Part of:
 * mdadm - manage Linux "md" devices aka RAID arrays.
 *
 * Copyright (C) 2002-2009 Neil Brown <neilb@suse.de>
 *
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *    Author: Neil Brown
 *    Email: <neilb@suse.de>
 */

/*
 * The /proc/mdstat file comes in at least 3 flavours:
 * In an unpatched 2.2 kernel (md 0.36.6):
 *  Personalities : [n raidx] ...
 *  read_ahead {not set|%d sectors}
 *  md0 : {in}active{ raidX /dev/hda...  %d blocks{ maxfault=%d}}
 *  md1 : .....
 *
 * Normally only 4 md lines, but all are listed.
 *
 * In a patched 2.2 kernel (md 0.90.0)
 *  Personalities : [raidx] ...
 *  read_ahead {not set|%d sectors}
 *  mdN : {in}active {(readonly)} raidX dev[%d]{(F)} ... %d blocks STATUS RESYNC
 *  ... Only initialised arrays listed
 *  unused devices: {dev dev ... | <none>}
 *
 * STATUS is personality dependant:
 *    linear:  %dk rounding
 *    raid0:   %dk chunks
 *    raid1:   [%d/%d] [U_U]   ( raid/working.  operational or not)
 *    raid5:   level 4/5, %dk chunk, algorithm %d [%d/%d] [U_U]
 *
 * RESYNC is  empty or:
 *    {resync|recovery}=%u%% finish=%u.%umin
 *  or
 *    resync=DELAYED
 *
 * In a 2.4 kernel (md 0.90.0/2.4)
 *  Personalities : [raidX] ...
 *  read_ahead {not set|%d sectors}
 *  mdN : {in}active {(read-only)} raidX dev[%d]{(F)} ...
 *       %d blocks STATUS
 *       RESYNC
 *  unused devices: {dev dev .. | <none>}
 *
 *  STATUS matches 0.90.0/2.2
 *  RESYNC includes [===>....],
 *          adds a space after {resync|recovery} and before and after '='
 *          adds a decimal to the recovery percent.
 *	    adds (%d/%d) resync amount  and max_blocks, before finish.
 *	    adds speed=%dK/sec after finish
 *
 *
 *
 * Out of this we want to extract:
 *   list of devices, active or not
 *   pattern of failed drives (so need number of drives)
 *   percent resync complete
 *
 * As continuation is indicated by leading space, we use
 *  conf_line from config.c to read logical lines
 *
 */

#include	"mdadm.h"
#include	"dlink.h"
#include	<sys/select.h>
#include	<ctype.h>

static void free_member_devnames(struct dev_member *m)
{
	while(m) {
		struct dev_member *t = m;

		m = m->next;
		free(t->name);
		free(t);
	}
}

static int add_member_devname(struct dev_member **m, char *name)
{
	struct dev_member *new;
	char *t;

	if ((t = strchr(name, '[')) == NULL)
		/* not a device */
		return 0;

	new = xmalloc(sizeof(*new));
	new->name = strndup(name, t - name);
	new->next = *m;
	*m = new;
	return 1;
}

void free_mdstat(struct mdstat_ent *ms)
{
	while (ms) {
		struct mdstat_ent *t;
		free(ms->level);
		free(ms->pattern);
		free(ms->metadata_version);
		free_member_devnames(ms->members);
		t = ms;
		ms = ms->next;
		free(t);
	}
}

static int mdstat_fd = -1;
struct mdstat_ent *mdstat_read(int hold, int start)
{
	FILE *f;
	struct mdstat_ent *all, *rv, **end, **insert_here;
	char *line;
	int fd;

	if (hold && mdstat_fd != -1) {
		off_t offset = lseek(mdstat_fd, 0L, 0);
		if (offset == (off_t)-1) {
			mdstat_close();
			return NULL;
		}
		fd = dup(mdstat_fd);
		if (fd >= 0)
			f = fdopen(fd, "r");
		else
			return NULL;
	} else
		f = fopen("/proc/mdstat", "r");
	if (f == NULL)
		return NULL;
	else
		fcntl(fileno(f), F_SETFD, FD_CLOEXEC);

	all = NULL;
	end = &all;
	for (; (line = conf_line(f)) ; free_line(line)) {
		struct mdstat_ent *ent;
		char *w;
		char devnm[32];
		int in_devs = 0;

		if (strcmp(line, "Personalities")==0)
			continue;
		if (strcmp(line, "read_ahead")==0)
			continue;
		if (strcmp(line, "unused")==0)
			continue;
		insert_here = NULL;
		/* Better be an md line.. */
		if (strncmp(line, "md", 2)!= 0 || strlen(line) >= 32
		    || (line[2] != '_' && !isdigit(line[2])))
			continue;
		strcpy(devnm, line);

		ent = xmalloc(sizeof(*ent));
		ent->level = ent->pattern= NULL;
		ent->next = NULL;
		ent->percent = RESYNC_NONE;
		ent->active = -1;
		ent->resync = 0;
		ent->metadata_version = NULL;
		ent->raid_disks = 0;
		ent->devcnt = 0;
		ent->members = NULL;

		strcpy(ent->devnm, devnm);

		for (w=dl_next(line); w!= line ; w=dl_next(w)) {
			int l = strlen(w);
			char *eq;
			if (strcmp(w, "active")==0)
				ent->active = 1;
			else if (strcmp(w, "inactive")==0) {
				ent->active = 0;
				in_devs = 1;
			} else if (ent->active > 0 &&
				 ent->level == NULL &&
				 w[0] != '(' /*readonly*/) {
				ent->level = xstrdup(w);
				in_devs = 1;
			} else if (in_devs && strcmp(w, "blocks")==0)
				in_devs = 0;
			else if (in_devs) {
				char *ep = strchr(w, '[');
				ent->devcnt +=
					add_member_devname(&ent->members, w);
				if (ep && strncmp(w, "md", 2)==0) {
					/* This has an md device as a component.
					 * If that device is already in the
					 * list, make sure we insert before
					 * there.
					 */
					struct mdstat_ent **ih;
					ih = &all;
					while (ih != insert_here && *ih &&
					       ((int)strlen((*ih)->devnm) != ep-w
						|| strncmp((*ih)->devnm, w, ep-w) != 0))
						ih = & (*ih)->next;
					insert_here = ih;
				}
			} else if (strcmp(w, "super") == 0 &&
				   dl_next(w) != line) {
				w = dl_next(w);
				ent->metadata_version = xstrdup(w);
			} else if (w[0] == '[' && isdigit(w[1])) {
				ent->raid_disks = atoi(w+1);
			} else if (!ent->pattern &&
				 w[0] == '[' &&
				 (w[1] == 'U' || w[1] == '_')) {
				ent->pattern = xstrdup(w+1);
				if (ent->pattern[l-2]==']')
					ent->pattern[l-2] = '\0';
			} else if (ent->percent == RESYNC_NONE &&
				   strncmp(w, "re", 2)== 0 &&
				   w[l-1] == '%' &&
				   (eq=strchr(w, '=')) != NULL ) {
				ent->percent = atoi(eq+1);
				if (strncmp(w,"resync", 6)==0)
					ent->resync = 1;
				else if (strncmp(w, "reshape", 7)==0)
					ent->resync = 2;
				else
					ent->resync = 0;
			} else if (ent->percent == RESYNC_NONE &&
				   (w[0] == 'r' || w[0] == 'c')) {
				if (strncmp(w, "resync", 4)==0)
					ent->resync = 1;
				if (strncmp(w, "reshape", 7)==0)
					ent->resync = 2;
				if (strncmp(w, "recovery", 8)==0)
					ent->resync = 0;
				if (strncmp(w, "check", 5)==0)
					ent->resync = 3;

				if (l > 8 && strcmp(w+l-8, "=DELAYED") == 0)
					ent->percent = RESYNC_DELAYED;
				if (l > 8 && strcmp(w+l-8, "=PENDING") == 0)
					ent->percent = RESYNC_PENDING;
			} else if (ent->percent == RESYNC_NONE &&
				   w[0] >= '0' &&
				   w[0] <= '9' &&
				   w[l-1] == '%') {
				ent->percent = atoi(w);
			}
		}
		if (insert_here && (*insert_here)) {
			ent->next = *insert_here;
			*insert_here = ent;
		} else {
			*end = ent;
			end = &ent->next;
		}
	}
	if (hold && mdstat_fd == -1) {
		mdstat_fd = dup(fileno(f));
		fcntl(mdstat_fd, F_SETFD, FD_CLOEXEC);
	}
	fclose(f);

	/* If we might want to start array,
	 * reverse the order, so that components comes before composites
	 */
	if (start) {
		rv = NULL;
		while (all) {
			struct mdstat_ent *e = all;
			all = all->next;
			e->next = rv;
			rv = e;
		}
	} else rv = all;
	return rv;
}

void mdstat_close(void)
{
	if (mdstat_fd >= 0)
		close(mdstat_fd);
	mdstat_fd = -1;
}

void mdstat_wait(int seconds)
{
	fd_set fds;
	struct timeval tm;
	int maxfd = 0;
	FD_ZERO(&fds);
	if (mdstat_fd >= 0) {
		FD_SET(mdstat_fd, &fds);
		maxfd = mdstat_fd;
	}
	tm.tv_sec = seconds;
	tm.tv_usec = 0;
	select(maxfd + 1, NULL, NULL, &fds, &tm);
}

void mdstat_wait_fd(int fd, const sigset_t *sigmask)
{
	fd_set fds, rfds;
	int maxfd = 0;

	FD_ZERO(&fds);
	FD_ZERO(&rfds);
	if (mdstat_fd >= 0)
		FD_SET(mdstat_fd, &fds);

	if (fd >= 0) {
		struct stat stb;
		fstat(fd, &stb);
		if ((stb.st_mode & S_IFMT) == S_IFREG)
			/* Must be a /proc or /sys fd, so expect
			 * POLLPRI
			 * i.e. an 'exceptional' event.
			 */
			FD_SET(fd, &fds);
		else
			FD_SET(fd, &rfds);

		if (fd > maxfd)
			maxfd = fd;

	}
	if (mdstat_fd > maxfd)
		maxfd = mdstat_fd;

	pselect(maxfd + 1, &rfds, NULL, &fds,
		NULL, sigmask);
}

int mddev_busy(char *devnm)
{
	struct mdstat_ent *mdstat = mdstat_read(0, 0);
	struct mdstat_ent *me;

	for (me = mdstat ; me ; me = me->next)
		if (strcmp(me->devnm, devnm) == 0)
			break;
	free_mdstat(mdstat);
	return me != NULL;
}

struct mdstat_ent *mdstat_by_component(char *name)
{
	struct mdstat_ent *mdstat = mdstat_read(0, 0);

	while (mdstat) {
		struct dev_member *m;
		struct mdstat_ent *ent;
		if (mdstat->metadata_version &&
		    strncmp(mdstat->metadata_version, "external:", 9) == 0 &&
		    is_subarray(mdstat->metadata_version+9))
			/* don't return subarrays, only containers */
			;
		else for (m = mdstat->members; m; m = m->next) {
				if (strcmp(m->name, name) == 0) {
					free_mdstat(mdstat->next);
					mdstat->next = NULL;
					return mdstat;
				}
			}
		ent = mdstat;
		mdstat = mdstat->next;
		ent->next = NULL;
		free_mdstat(ent);
	}
	return NULL;
}

struct mdstat_ent *mdstat_by_subdev(char *subdev, char *container)
{
	struct mdstat_ent *mdstat = mdstat_read(0, 0);
	struct mdstat_ent *ent = NULL;

	while (mdstat) {
		/* metadata version must match:
		 *   external:[/-]%s/%s
		 * where first %s is 'container' and second %s is 'subdev'
		 */
		if (ent)
			free_mdstat(ent);
		ent = mdstat;
		mdstat = mdstat->next;
		ent->next = NULL;

		if (ent->metadata_version == NULL ||
		    strncmp(ent->metadata_version, "external:", 9) != 0)
			continue;

		if (!metadata_container_matches(ent->metadata_version+9,
					       container) ||
		    !metadata_subdev_matches(ent->metadata_version+9,
					     subdev))
			continue;

		free_mdstat(mdstat);
		return ent;
	}
	return NULL;
}
Commit	Line	Data
e0d19036 NB	1	/*
	2	* mdstat - parse /proc/mdstat file. Part of:
	3	* mdadm - manage Linux "md" devices aka RAID arrays.
	4	*
e736b623	5	* Copyright (C) 2002-2009 Neil Brown <neilb@suse.de>
e0d19036 NB	6	*
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*
	22	* Author: Neil Brown
e736b623	23	* Email: <neilb@suse.de>
e0d19036 NB	24	*/
	25
	26	/*
	27	* The /proc/mdstat file comes in at least 3 flavours:
	28	* In an unpatched 2.2 kernel (md 0.36.6):
	29	* Personalities : [n raidx] ...
	30	* read_ahead {not set\|%d sectors}
	31	* md0 : {in}active{ raidX /dev/hda... %d blocks{ maxfault=%d}}
	32	* md1 : .....
	33	*
	34	* Normally only 4 md lines, but all are listed.
	35	*
	36	* In a patched 2.2 kernel (md 0.90.0)
	37	* Personalities : [raidx] ...
	38	* read_ahead {not set\|%d sectors}
	39	* mdN : {in}active {(readonly)} raidX dev[%d]{(F)} ... %d blocks STATUS RESYNC
	40	* ... Only initialised arrays listed
8f21823f	41	* unused devices: {dev dev ... \| <none>}
e0d19036 NB	42	*
	43	* STATUS is personality dependant:
	44	* linear: %dk rounding
	45	* raid0: %dk chunks
	46	* raid1: [%d/%d] [U_U] ( raid/working. operational or not)
	47	* raid5: level 4/5, %dk chunk, algorithm %d [%d/%d] [U_U]
	48	*
	49	* RESYNC is empty or:
	50	* {resync\|recovery}=%u%% finish=%u.%umin
	51	* or
	52	* resync=DELAYED
	53	*
	54	* In a 2.4 kernel (md 0.90.0/2.4)
	55	* Personalities : [raidX] ...
	56	* read_ahead {not set\|%d sectors}
	57	* mdN : {in}active {(read-only)} raidX dev[%d]{(F)} ...
	58	* %d blocks STATUS
	59	* RESYNC
8f21823f	60	* unused devices: {dev dev .. \| <none>}
e0d19036 NB	61	*
	62	* STATUS matches 0.90.0/2.2
	63	* RESYNC includes [===>....],
	64	* adds a space after {resync\|recovery} and before and after '='
	65	* adds a decimal to the recovery percent.
	66	* adds (%d/%d) resync amount and max_blocks, before finish.
	67	* adds speed=%dK/sec after finish
	68	*
	69	*
	70	*
	71	* Out of this we want to extract:
	72	* list of devices, active or not
	73	* pattern of failed drives (so need number of drives)
	74	* percent resync complete
	75	*
	76	* As continuation is indicated by leading space, we use
	77	* conf_line from config.c to read logical lines
	78	*
	79	*/
	80
	81	#include "mdadm.h"
	82	#include "dlink.h"
dd0781e5	83	#include <sys/select.h>
549e9569	84	#include <ctype.h>
e0d19036	85
3b57c466 N	86	static void free_member_devnames(struct dev_member *m)
	87	{
	88	while(m) {
	89	struct dev_member *t = m;
	90
	91	m = m->next;
	92	free(t->name);
	93	free(t);
	94	}
	95	}
	96
0ad6835c	97	static int add_member_devname(struct dev_member *m, char name)
3b57c466 N	98	{
	99	struct dev_member *new;
	100	char *t;
	101
	102	if ((t = strchr(name, '[')) == NULL)
	103	/* not a device */
0ad6835c	104	return 0;
3b57c466	105
503975b9	106	new = xmalloc(sizeof(*new));
3b57c466 N	107	new->name = strndup(name, t - name);
	108	new->next = *m;
	109	*m = new;
0ad6835c	110	return 1;
3b57c466 N	111	}
3b57c466 N	112
e0d19036 NB	113	void free_mdstat(struct mdstat_ent *ms)
	114	{
	115	while (ms) {
	116	struct mdstat_ent *t;
3b57c466 N	117	free(ms->level);
	118	free(ms->pattern);
	119	free(ms->metadata_version);
	120	free_member_devnames(ms->members);
e0d19036 NB	121	t = ms;
	122	ms = ms->next;
	123	free(t);
	124	}
	125	}
	126
dd0781e5	127	static int mdstat_fd = -1;
22a88995	128	struct mdstat_ent *mdstat_read(int hold, int start)
e0d19036 NB	129	{
e0d19036 NB	130	FILE *f;
22a88995	131	struct mdstat_ent all, rv, end, insert_here;
e0d19036	132	char *line;
d94a4f62	133	int fd;
e0d19036	134
dd0781e5	135	if (hold && mdstat_fd != -1) {
52209d6e TM	136	off_t offset = lseek(mdstat_fd, 0L, 0);
	137	if (offset == (off_t)-1) {
	138	mdstat_close();
	139	return NULL;
	140	}
d94a4f62 JS	141	fd = dup(mdstat_fd);
	142	if (fd >= 0)
	143	f = fdopen(fd, "r");
	144	else
	145	return NULL;
dd0781e5 NB	146	} else
dd0781e5 NB	147	f = fopen("/proc/mdstat", "r");
e0d19036 NB	148	if (f == NULL)
e0d19036 NB	149	return NULL;
e4dc5106 DL	150	else
e4dc5106 DL	151	fcntl(fileno(f), F_SETFD, FD_CLOEXEC);
e0d19036 NB	152
	153	all = NULL;
	154	end = &all;
	155	for (; (line = conf_line(f)) ; free_line(line)) {
	156	struct mdstat_ent *ent;
	157	char *w;
4dd2df09	158	char devnm[32];
22a88995	159	int in_devs = 0;
e0d19036 NB	160
	161	if (strcmp(line, "Personalities")==0)
	162	continue;
	163	if (strcmp(line, "read_ahead")==0)
	164	continue;
	165	if (strcmp(line, "unused")==0)
	166	continue;
22a88995	167	insert_here = NULL;
e0d19036	168	/* Better be an md line.. */
4dd2df09 N	169	if (strncmp(line, "md", 2)!= 0 \|\| strlen(line) >= 32
4dd2df09 N	170	\|\| (line[2] != '_' && !isdigit(line[2])))
98c6faba	171	continue;
4dd2df09	172	strcpy(devnm, line);
e0d19036	173
503975b9	174	ent = xmalloc(sizeof(*ent));
9581efb1	175	ent->level = ent->pattern= NULL;
e0d19036	176	ent->next = NULL;
9dad51d4	177	ent->percent = RESYNC_NONE;
e0d19036	178	ent->active = -1;
e5329c37	179	ent->resync = 0;
549e9569 NB	180	ent->metadata_version = NULL;
549e9569 NB	181	ent->raid_disks = 0;
549e9569	182	ent->devcnt = 0;
3b57c466	183	ent->members = NULL;
e0d19036	184
4dd2df09	185	strcpy(ent->devnm, devnm);
aba69144	186
e0d19036 NB	187	for (w=dl_next(line); w!= line ; w=dl_next(w)) {
	188	int l = strlen(w);
	189	char *eq;
	190	if (strcmp(w, "active")==0)
	191	ent->active = 1;
b6d7a7fb	192	else if (strcmp(w, "inactive")==0) {
e0d19036	193	ent->active = 0;
b6d7a7fb JD	194	in_devs = 1;
b6d7a7fb JD	195	} else if (ent->active > 0 &&
e0d19036	196	ent->level == NULL &&
22a88995	197	w[0] != '(' /readonly/) {
503975b9	198	ent->level = xstrdup(w);
22a88995 NB	199	in_devs = 1;
	200	} else if (in_devs && strcmp(w, "blocks")==0)
	201	in_devs = 0;
549e9569	202	else if (in_devs) {
4dd2df09	203	char *ep = strchr(w, '[');
0ad6835c ML	204	ent->devcnt +=
0ad6835c ML	205	add_member_devname(&ent->members, w);
4dd2df09	206	if (ep && strncmp(w, "md", 2)==0) {
549e9569 NB	207	/* This has an md device as a component.
	208	* If that device is already in the
	209	* list, make sure we insert before
	210	* there.
	211	*/
	212	struct mdstat_ent **ih;
549e9569 NB	213	ih = &all;
549e9569 NB	214	while (ih != insert_here && *ih &&
4dd2df09 N	215	((int)strlen((*ih)->devnm) != ep-w
4dd2df09 N	216	\|\| strncmp((*ih)->devnm, w, ep-w) != 0))
549e9569 NB	217	ih = & (*ih)->next;
	218	insert_here = ih;
	219	}
	220	} else if (strcmp(w, "super") == 0 &&
	221	dl_next(w) != line) {
	222	w = dl_next(w);
503975b9	223	ent->metadata_version = xstrdup(w);
549e9569 NB	224	} else if (w[0] == '[' && isdigit(w[1])) {
549e9569 NB	225	ent->raid_disks = atoi(w+1);
22a88995	226	} else if (!ent->pattern &&
e0d19036 NB	227	w[0] == '[' &&
e0d19036 NB	228	(w[1] == 'U' \|\| w[1] == '_')) {
503975b9	229	ent->pattern = xstrdup(w+1);
e0d19036 NB	230	if (ent->pattern[l-2]==']')
e0d19036 NB	231	ent->pattern[l-2] = '\0';
9dad51d4	232	} else if (ent->percent == RESYNC_NONE &&
e0d19036 NB	233	strncmp(w, "re", 2)== 0 &&
	234	w[l-1] == '%' &&
	235	(eq=strchr(w, '=')) != NULL ) {
	236	ent->percent = atoi(eq+1);
f94c116f	237	if (strncmp(w,"resync", 6)==0)
e5329c37	238	ent->resync = 1;
f94c116f N	239	else if (strncmp(w, "reshape", 7)==0)
	240	ent->resync = 2;
	241	else
	242	ent->resync = 0;
9dad51d4	243	} else if (ent->percent == RESYNC_NONE &&
f94c116f N	244	(w[0] == 'r' \|\| w[0] == 'c')) {
	245	if (strncmp(w, "resync", 4)==0)
	246	ent->resync = 1;
	247	if (strncmp(w, "reshape", 7)==0)
	248	ent->resync = 2;
	249	if (strncmp(w, "recovery", 8)==0)
aa8d7dc7	250	ent->resync = 0;
f94c116f N	251	if (strncmp(w, "check", 5)==0)
	252	ent->resync = 3;
	253
2d3603ba	254	if (l > 8 && strcmp(w+l-8, "=DELAYED") == 0)
9dad51d4	255	ent->percent = RESYNC_DELAYED;
2d3603ba	256	if (l > 8 && strcmp(w+l-8, "=PENDING") == 0)
9dad51d4 N	257	ent->percent = RESYNC_PENDING;
9dad51d4 N	258	} else if (ent->percent == RESYNC_NONE &&
aba69144	259	w[0] >= '0' &&
e0d19036 NB	260	w[0] <= '9' &&
	261	w[l-1] == '%') {
	262	ent->percent = atoi(w);
	263	}
	264	}
22a88995 NB	265	if (insert_here && (*insert_here)) {
	266	ent->next = *insert_here;
	267	*insert_here = ent;
	268	} else {
	269	*end = ent;
	270	end = &ent->next;
	271	}
e0d19036	272	}
e4dc5106	273	if (hold && mdstat_fd == -1) {
dd0781e5	274	mdstat_fd = dup(fileno(f));
e4dc5106 DL	275	fcntl(mdstat_fd, F_SETFD, FD_CLOEXEC);
e4dc5106 DL	276	}
e0d19036	277	fclose(f);
22a88995 NB	278
	279	/* If we might want to start array,
	280	* reverse the order, so that components comes before composites
	281	*/
	282	if (start) {
	283	rv = NULL;
	284	while (all) {
	285	struct mdstat_ent *e = all;
	286	all = all->next;
	287	e->next = rv;
	288	rv = e;
	289	}
	290	} else rv = all;
	291	return rv;
e0d19036	292	}
dd0781e5	293
a7a0d8a1 N	294	void mdstat_close(void)
	295	{
	296	if (mdstat_fd >= 0)
	297	close(mdstat_fd);
	298	mdstat_fd = -1;
	299	}
	300
dd0781e5 NB	301	void mdstat_wait(int seconds)
	302	{
	303	fd_set fds;
	304	struct timeval tm;
0b5ec75e	305	int maxfd = 0;
dd0781e5	306	FD_ZERO(&fds);
0b5ec75e	307	if (mdstat_fd >= 0) {
dd0781e5	308	FD_SET(mdstat_fd, &fds);
0b5ec75e N	309	maxfd = mdstat_fd;
0b5ec75e N	310	}
dd0781e5 NB	311	tm.tv_sec = seconds;
dd0781e5 NB	312	tm.tv_usec = 0;
0b5ec75e	313	select(maxfd + 1, NULL, NULL, &fds, &tm);
dd0781e5	314	}
8382f19b	315
58a4ba2a	316	void mdstat_wait_fd(int fd, const sigset_t *sigmask)
549e9569 NB	317	{
549e9569 NB	318	fd_set fds, rfds;
5d4d1b26	319	int maxfd = 0;
549e9569 NB	320
	321	FD_ZERO(&fds);
	322	FD_ZERO(&rfds);
	323	if (mdstat_fd >= 0)
	324	FD_SET(mdstat_fd, &fds);
5d4d1b26	325
58a4ba2a	326	if (fd >= 0) {
28005287 N	327	struct stat stb;
	328	fstat(fd, &stb);
	329	if ((stb.st_mode & S_IFMT) == S_IFREG)
	330	/* Must be a /proc or /sys fd, so expect
	331	* POLLPRI
	332	* i.e. an 'exceptional' event.
	333	*/
	334	FD_SET(fd, &fds);
	335	else
	336	FD_SET(fd, &rfds);
5d4d1b26 N	337
	338	if (fd > maxfd)
	339	maxfd = fd;
	340
28005287	341	}
0b5ec75e N	342	if (mdstat_fd > maxfd)
0b5ec75e N	343	maxfd = mdstat_fd;
549e9569	344
0b5ec75e	345	pselect(maxfd + 1, &rfds, NULL, &fds,
1ed3f387	346	NULL, sigmask);
549e9569 NB	347	}
549e9569 NB	348
4dd2df09	349	int mddev_busy(char *devnm)
8382f19b NB	350	{
	351	struct mdstat_ent *mdstat = mdstat_read(0, 0);
	352	struct mdstat_ent *me;
	353
	354	for (me = mdstat ; me ; me = me->next)
4dd2df09	355	if (strcmp(me->devnm, devnm) == 0)
8382f19b NB	356	break;
	357	free_mdstat(mdstat);
	358	return me != NULL;
	359	}
3b57c466 N	360
	361	struct mdstat_ent mdstat_by_component(char name)
	362	{
	363	struct mdstat_ent *mdstat = mdstat_read(0, 0);
	364
	365	while (mdstat) {
	366	struct dev_member *m;
	367	struct mdstat_ent *ent;
	368	if (mdstat->metadata_version &&
	369	strncmp(mdstat->metadata_version, "external:", 9) == 0 &&
	370	is_subarray(mdstat->metadata_version+9))
	371	/* don't return subarrays, only containers */
	372	;
	373	else for (m = mdstat->members; m; m = m->next) {
	374	if (strcmp(m->name, name) == 0) {
	375	free_mdstat(mdstat->next);
	376	mdstat->next = NULL;
	377	return mdstat;
	378	}
	379	}
	380	ent = mdstat;
	381	mdstat = mdstat->next;
	382	ent->next = NULL;
	383	free_mdstat(ent);
	384	}
	385	return NULL;
	386	}
78b10e66	387
4dd2df09	388	struct mdstat_ent mdstat_by_subdev(char subdev, char *container)
78b10e66 N	389	{
78b10e66 N	390	struct mdstat_ent *mdstat = mdstat_read(0, 0);
4dd2df09	391	struct mdstat_ent *ent = NULL;
78b10e66 N	392
78b10e66 N	393	while (mdstat) {
78b10e66	394	/* metadata version must match:
4dd2df09 N	395	* external:[/-]%s/%s
4dd2df09 N	396	* where first %s is 'container' and second %s is 'subdev'
78b10e66	397	*/
4dd2df09 N	398	if (ent)
4dd2df09 N	399	free_mdstat(ent);
78b10e66 N	400	ent = mdstat;
	401	mdstat = mdstat->next;
	402	ent->next = NULL;
4dd2df09 N	403
	404	if (ent->metadata_version == NULL \|\|
	405	strncmp(ent->metadata_version, "external:", 9) != 0)
	406	continue;
	407
	408	if (!metadata_container_matches(ent->metadata_version+9,
	409	container) \|\|
	410	!metadata_subdev_matches(ent->metadata_version+9,
	411	subdev))
	412	continue;
	413
	414	free_mdstat(mdstat);
	415	return ent;
78b10e66 N	416	}
	417	return NULL;
	418	}