* sysfs - extract md related information from sysfs. Part of:
* mdadm - manage Linux "md" devices aka RAID arrays.
*
- * Copyright (C) 2006 Neil Brown <neilb@suse.de>
+ * Copyright (C) 2006-2009 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
void sysfs_init(struct mdinfo *mdi, int fd, int devnum)
{
+ mdi->sys_name[0] = 0;
if (fd >= 0) {
- struct stat stb;
mdu_version_t vers;
- if (fstat(fd, &stb))
- return;
if (ioctl(fd, RAID_VERSION, &vers) != 0)
return;
- if (major(stb.st_rdev) == MD_MAJOR)
- sprintf(mdi->sys_name, "md%d", (int)minor(stb.st_rdev));
- else if (major(stb.st_rdev) == get_mdp_major())
- sprintf(mdi->sys_name, "md_d%d",
- (int)minor(stb.st_rdev)>>MdpMinorShift);
- else {
- /* must be an extended-minor partition. Look at the
- * /sys/dev/block/%d:%d link which must look like
- * ../../block/mdXXX/mdXXXpYY
- */
- char path[30];
- char link[200];
- char *cp;
- int n;
- sprintf(path, "/sys/dev/block/%d:%d", major(stb.st_rdev),
- minor(stb.st_rdev));
- n = readlink(path, link, sizeof(link)-1);
- if (n <= 0)
- return;
- link[n] = 0;
- cp = strrchr(link, '/');
- if (cp) *cp = 0;
- cp = strchr(link, '/');
- if (cp && strncmp(cp, "/md", 3) == 0)
- strcpy(mdi->sys_name, cp+1);
- else
- return;
- }
- } else {
- if (devnum >= 0)
- sprintf(mdi->sys_name, "md%d", devnum);
- else
- sprintf(mdi->sys_name, "md_d%d",
- -1-devnum);
+ devnum = fd2devnum(fd);
}
+ if (devnum == NoMdDev)
+ return;
+ if (devnum >= 0)
+ sprintf(mdi->sys_name, "md%d", devnum);
+ else
+ sprintf(mdi->sys_name, "md_d%d",
+ -1-devnum);
}
+
struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options)
{
/* Longest possible name in sysfs, mounted at /sys, is
return sra;
memset(sra, 0, sizeof(*sra));
sysfs_init(sra, fd, devnum);
+ if (sra->sys_name[0] == 0) {
+ free(sra);
+ return NULL;
+ }
sprintf(fname, "/sys/block/%s/md/", sra->sys_name);
base = fname + strlen(fname);
}
}
- dev->next = sra->devs;
- sra->devs = dev;
-
strcpy(dev->sys_name, de->d_name);
dev->disk.raid_disk = strtoul(buf, &ep, 10);
if (*ep) dev->disk.raid_disk = -1;
strcpy(dbase, "block/dev");
- if (load_sys(fname, buf))
- goto abort;
+ if (load_sys(fname, buf)) {
+ free(dev);
+ if (options & SKIP_GONE_DEVS)
+ continue;
+ else
+ goto abort;
+ }
sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor);
+ /* special case check for block devices that can go 'offline' */
+ if (options & SKIP_GONE_DEVS) {
+ strcpy(dbase, "block/device/state");
+ if (load_sys(fname, buf) == 0 &&
+ strncmp(buf, "offline", 7) == 0) {
+ free(dev);
+ continue;
+ }
+ }
+
+ /* finally add this disk to the array */
+ dev->next = sra->devs;
+ sra->devs = dev;
+
if (options & GET_OFFSET) {
strcpy(dbase, "offset");
if (load_sys(fname, buf))
return sysfs_set_str(sra, dev, name, valstr);
}
-int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
- char *name, unsigned long long *val)
+int sysfs_uevent(struct mdinfo *sra, char *event)
{
char fname[50];
- char buf[50];
int n;
int fd;
- char *ep;
+
+ sprintf(fname, "/sys/block/%s/uevent",
+ sra->sys_name);
+ fd = open(fname, O_WRONLY);
+ if (fd < 0)
+ return -1;
+ n = write(fd, event, strlen(event));
+ close(fd);
+ return 0;
+}
+
+int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev,
+ char *name)
+{
+ char fname[50];
+ int fd;
+
sprintf(fname, "/sys/block/%s/md/%s/%s",
sra->sys_name, dev?dev->sys_name:"", name);
- fd = open(fname, O_RDONLY);
+ fd = open(fname, O_RDWR);
if (fd < 0)
- return -1;
+ fd = open(fname, O_RDONLY);
+ return fd;
+}
+
+int sysfs_fd_get_ll(int fd, unsigned long long *val)
+{
+ char buf[50];
+ int n;
+ char *ep;
+
+ lseek(fd, 0, 0);
n = read(fd, buf, sizeof(buf));
- close(fd);
if (n <= 0)
return -1;
buf[n] = 0;
return 0;
}
+int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
+ char *name, unsigned long long *val)
+{
+ int n;
+ int fd;
+
+ fd = sysfs_get_fd(sra, dev, name);
+ if (fd < 0)
+ return -1;
+ n = sysfs_fd_get_ll(fd, val);
+ close(fd);
+ return n;
+}
+
+int sysfs_fd_get_str(int fd, char *val, int size)
+{
+ int n;
+
+ lseek(fd, 0, 0);
+ n = read(fd, val, size);
+ if (n <= 0)
+ return -1;
+ val[n] = 0;
+ return n;
+}
+
+int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev,
+ char *name, char *val, int size)
+{
+ int n;
+ int fd;
+
+ fd = sysfs_get_fd(sra, dev, name);
+ if (fd < 0)
+ return -1;
+ n = sysfs_fd_get_str(fd, val, size);
+ close(fd);
+ return n;
+}
+
int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms)
{
unsigned long sec;
rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size);
rv |= sysfs_set_num(info, NULL, "layout", info->array.layout);
rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2);
+ if (info->custom_array_size) {
+ int rc;
+
+ rc = sysfs_set_num(info, NULL, "array_size",
+ info->custom_array_size/2);
+ if (rc && errno == ENOENT) {
+ fprintf(stderr, Name ": This kernel does not "
+ "have the md/array_size attribute, "
+ "the array may be larger than expected\n");
+ rc = 0;
+ }
+ rv |= rc;
+ }
+
if (info->array.level > 0)
rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start);
return rv;
rv = sysfs_set_num(sra, sd, "offset", sd->data_offset);
rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2);
if (sra->array.level != LEVEL_CONTAINER) {
+ if (sd->recovery_start == MaxSector)
+ /* This can correctly fail if array isn't started,
+ * yet, so just ignore status for now.
+ */
+ sysfs_set_str(sra, sd, "state", "insync");
rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk);
-// rv |= sysfs_set_str(sra, sd, "state", "in_sync");
}
return rv;
}
else
return found;
}
+
+#ifndef MDASSEMBLE
+
+static char *clean_states[] = {
+ "clear", "inactive", "readonly", "read-auto", "clean", NULL };
+
+int WaitClean(char *dev, int sock, int verbose)
+{
+ int fd;
+ struct mdinfo *mdi;
+ int rv = 1;
+ int devnum;
+
+ fd = open(dev, O_RDONLY);
+ if (fd < 0) {
+ if (verbose)
+ fprintf(stderr, Name ": Couldn't open %s: %s\n", dev, strerror(errno));
+ return 1;
+ }
+
+ devnum = fd2devnum(fd);
+ mdi = sysfs_read(fd, devnum, GET_VERSION|GET_LEVEL|GET_SAFEMODE);
+ if (!mdi) {
+ if (verbose)
+ fprintf(stderr, Name ": Failed to read sysfs attributes for "
+ "%s\n", dev);
+ close(fd);
+ return 0;
+ }
+
+ switch(mdi->array.level) {
+ case LEVEL_LINEAR:
+ case LEVEL_MULTIPATH:
+ case 0:
+ /* safemode delay is irrelevant for these levels */
+ rv = 0;
+
+ }
+
+ /* for internal metadata the kernel handles the final clean
+ * transition, containers can never be dirty
+ */
+ if (!is_subarray(mdi->text_version))
+ rv = 0;
+
+ /* safemode disabled ? */
+ if (mdi->safe_mode_delay == 0)
+ rv = 0;
+
+ if (rv) {
+ int state_fd = sysfs_open(fd2devnum(fd), NULL, "array_state");
+ char buf[20];
+ fd_set fds;
+ struct timeval tm;
+
+ /* minimize the safe_mode_delay and prepare to wait up to 5s
+ * for writes to quiesce
+ */
+ sysfs_set_safemode(mdi, 1);
+ tm.tv_sec = 5;
+ tm.tv_usec = 0;
+
+ /* give mdmon a chance to checkpoint resync */
+ sysfs_set_str(mdi, NULL, "sync_action", "idle");
+
+ FD_ZERO(&fds);
+
+ /* wait for array_state to be clean */
+ while (1) {
+ rv = read(state_fd, buf, sizeof(buf));
+ if (rv < 0)
+ break;
+ if (sysfs_match_word(buf, clean_states) <= 4)
+ break;
+ FD_SET(state_fd, &fds);
+ rv = select(state_fd + 1, NULL, NULL, &fds, &tm);
+ if (rv < 0 && errno != EINTR)
+ break;
+ lseek(state_fd, 0, SEEK_SET);
+ }
+ if (rv < 0)
+ rv = 1;
+ else if (fping_monitor(sock) == 0 ||
+ ping_monitor(mdi->text_version) == 0) {
+ /* we need to ping to close the window between array
+ * state transitioning to clean and the metadata being
+ * marked clean
+ */
+ rv = 0;
+ } else
+ rv = 1;
+ if (rv && verbose)
+ fprintf(stderr, Name ": Error waiting for %s to be clean\n",
+ dev);
+
+ /* restore the original safe_mode_delay */
+ sysfs_set_safemode(mdi, mdi->safe_mode_delay);
+ close(state_fd);
+ }
+
+ sysfs_free(mdi);
+ close(fd);
+
+ return rv;
+}
+#endif /* MDASSEMBLE */
projects / thirdparty / mdadm.git / blobdiff