X-Git-Url: http://git.ipfire.org/?p=thirdparty%2Fmdadm.git;a=blobdiff_plain;f=util.c;h=1736d70791c8ce5d145f6c01516384f4c19adb30;hp=2cb6dd316f8e173ab913e54a778e96110a450524;hb=9008ed1c9623b7c11775ea8a7be17eb1bde5fd09;hpb=e81cdd9f3794d2b4452ae2297c43e16e3faf6f6a diff --git a/util.c b/util.c index 2cb6dd31..1736d707 100644 --- a/util.c +++ b/util.c @@ -29,8 +29,46 @@ #include "mdadm.h" #include "md_p.h" +#include #include +#include +#include #include +#include +#include + +/* + * following taken from linux/blkpg.h because they aren't + * anywhere else and it isn't safe to #include linux/ * stuff. + */ + +#define BLKPG _IO(0x12,105) + +/* The argument structure */ +struct blkpg_ioctl_arg { + int op; + int flags; + int datalen; + void *data; +}; + +/* The subfunctions (for the op field) */ +#define BLKPG_ADD_PARTITION 1 +#define BLKPG_DEL_PARTITION 2 + +/* Sizes of name fields. Unused at present. */ +#define BLKPG_DEVNAMELTH 64 +#define BLKPG_VOLNAMELTH 64 + +/* The data structure for ADD_PARTITION and DEL_PARTITION */ +struct blkpg_partition { + long long start; /* starting offset in bytes */ + long long length; /* length in bytes */ + int pno; /* partition number */ + char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2, + to be used in kernel messages */ + char volname[BLKPG_VOLNAMELTH]; /* volume label */ +}; /* * Parse a 128 bit uuid in 4 integers @@ -40,33 +78,32 @@ */ int parse_uuid(char *str, int uuid[4]) { - int hit = 0; /* number of Hex digIT */ - int i; - char c; - for (i=0; i<4; i++) uuid[i]=0; - - while ((c= *str++)) { - int n; - if (c>='0' && c<='9') - n = c-'0'; - else if (c>='a' && c <= 'f') - n = 10 + c - 'a'; - else if (c>='A' && c <= 'F') - n = 10 + c - 'A'; - else if (strchr(":. -", c)) - continue; - else return 0; - - if (hit<32) { - uuid[hit/8] <<= 4; - uuid[hit/8] += n; + int hit = 0; /* number of Hex digIT */ + int i; + char c; + for (i=0; i<4; i++) uuid[i]=0; + + while ((c= *str++)) { + int n; + if (c>='0' && c<='9') + n = c-'0'; + else if (c>='a' && c <= 'f') + n = 10 + c - 'a'; + else if (c>='A' && c <= 'F') + n = 10 + c - 'A'; + else if (strchr(":. -", c)) + continue; + else return 0; + + if (hit<32) { + uuid[hit/8] <<= 4; + uuid[hit/8] += n; + } + hit++; } - hit++; - } - if (hit == 32) - return 1; - return 0; - + if (hit == 32) + return 1; + return 0; } @@ -99,7 +136,6 @@ int md_get_version(int fd) return -1; } - int get_linux_version() { struct utsname name; @@ -118,7 +154,26 @@ int get_linux_version() return (a*1000000)+(b*1000)+c; } -int enough(int level, int raid_disks, int layout, +void remove_partitions(int fd) +{ + /* remove partitions from this block devices. + * This is used for components added to an array + */ +#ifdef BLKPG_DEL_PARTITION + struct blkpg_ioctl_arg a; + struct blkpg_partition p; + + a.op = BLKPG_DEL_PARTITION; + a.data = (void*)&p; + a.datalen = sizeof(p); + a.flags = 0; + memset(a.data, 0, a.datalen); + for (p.pno=0; p.pno < 16; p.pno++) + ioctl(fd, BLKPG, &a); +#endif +} + +int enough(int level, int raid_disks, int layout, int clean, char *avail, int avail_disks) { int copies, first; @@ -127,7 +182,7 @@ int enough(int level, int raid_disks, int layout, /* This is the tricky one - we need to check * which actual disks are present. */ - copies = (layout&255)* (layout>>8); + copies = (layout&255)* ((layout>>8) & 255); first=0; do { /* there must be one of the 'copies' form 'first' */ @@ -153,20 +208,31 @@ int enough(int level, int raid_disks, int layout, return avail_disks >= 1; case 4: case 5: - return avail_disks >= raid_disks-1; + if (clean) + return avail_disks >= raid_disks-1; + else + return avail_disks >= raid_disks; case 6: - return avail_disks >= raid_disks-2; + if (clean) + return avail_disks >= raid_disks-2; + else + return avail_disks >= raid_disks; default: return 0; } } +const int uuid_match_any[4] = { ~0, ~0, ~0, ~0 }; int same_uuid(int a[4], int b[4], int swapuuid) { + if (memcmp(a, uuid_match_any, sizeof(int[4])) == 0 || + memcmp(b, uuid_match_any, sizeof(int[4])) == 0) + return 1; + if (swapuuid) { /* parse uuids are hostendian. * uuid's from some superblocks are big-ending - * if there is a difference, we need to swap.. + * if there is a difference, we need to swap.. */ unsigned char *ac = (unsigned char *)a; unsigned char *bc = (unsigned char *)b; @@ -188,7 +254,48 @@ int same_uuid(int a[4], int b[4], int swapuuid) return 0; } } +void copy_uuid(void *a, int b[4], int swapuuid) +{ + if (swapuuid) { + /* parse uuids are hostendian. + * uuid's from some superblocks are big-ending + * if there is a difference, we need to swap.. + */ + unsigned char *ac = (unsigned char *)a; + unsigned char *bc = (unsigned char *)b; + int i; + for (i=0; i<16; i+= 4) { + ac[i+0] = bc[i+3]; + ac[i+1] = bc[i+2]; + ac[i+2] = bc[i+1]; + ac[i+3] = bc[i+0]; + } + } else + memcpy(a, b, 16); +} +char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep) +{ + int i, j; + int id; + char uuid[16]; + char *c = buf; + strcpy(c, "UUID-"); + c += strlen(c); + copy_uuid(uuid, info->uuid, st->ss->swapuuid); + for (i = 0; i < 4; i++) { + id = uuid[i]; + if (i) + *c++ = sep; + for (j = 3; j >= 0; j--) { + sprintf(c,"%02x", (unsigned char) uuid[j+4*i]); + c+= 2; + } + } + return buf; +} + +#ifndef MDASSEMBLE int check_ext2(int fd, char *name) { /* @@ -240,25 +347,24 @@ int check_reiser(int fd, char *name) fprintf(stderr, Name ": %s appears to contain a reiserfs file system\n",name); size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8; fprintf(stderr, " size = %luK\n", size*4); - + return 1; } int check_raid(int fd, char *name) { - void *super; struct mdinfo info; time_t crtime; char *level; struct supertype *st = guess_super(fd); if (!st) return 0; - st->ss->load_super(st, fd, &super, name); + st->ss->load_super(st, fd, name); /* Looks like a raid array .. */ fprintf(stderr, Name ": %s appears to be part of a raid array:\n", name); - st->ss->getinfo_super(&info, super); - free(super); + st->ss->getinfo_super(st, &info); + st->ss->free_super(st); crtime = info.array.ctime; level = map_num(pers, info.array.level); if (!level) level = "-unknown-"; @@ -286,6 +392,7 @@ int ask(char *mesg) fprintf(stderr, Name ": assuming 'no'\n"); return 0; } +#endif /* MDASSEMBLE */ char *map_num(mapping_t *map, int num) { @@ -312,7 +419,10 @@ int is_standard(char *dev, int *nump) { /* tests if dev is a "standard" md dev name. * i.e if the last component is "/dNN" or "/mdNN", - * where NN is a string of digits + * where NN is a string of digits + * Returns 1 if a partitionable standard, + * -1 if non-partitonable, + * 0 if not a standard name. */ char *d = strrchr(dev, '/'); int type=0; @@ -322,7 +432,7 @@ int is_standard(char *dev, int *nump) if (strncmp(d, "/d",2)==0) d += 2, type=1; /* /dev/md/dN{pM} */ else if (strncmp(d, "/md_d", 5)==0) - d += 5, type=1; /* /dev/md_dNpM */ + d += 5, type=1; /* /dev/md_dN{pM} */ else if (strncmp(d, "/md", 3)==0) d += 3, type=-1; /* /dev/mdN */ else if (d-dev > 3 && strncmp(d-2, "md/", 3)==0) @@ -354,32 +464,6 @@ struct devmap { } *devlist = NULL; int devlist_ready = 0; -#ifdef UCLIBC -int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s) -{ - return 0; -} -char *map_dev(int major, int minor, int create) -{ -#if 0 - fprintf(stderr, "Warning - fail to map %d,%d to a device name\n", - major, minor); -#endif - return NULL; -} -#else - -#ifdef __dietlibc__ -int add_dev_1(const char *name, const struct stat *stb, int flag) -{ - return add_dev(name, stb, flag, NULL); -} -int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags) -{ - return ftw(path, add_dev_1, nopenfd); -} -#endif - int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s) { struct stat st; @@ -404,6 +488,24 @@ int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s) return 0; } +#ifndef HAVE_NFTW +#ifdef HAVE_FTW +int add_dev_1(const char *name, const struct stat *stb, int flag) +{ + return add_dev(name, stb, flag, NULL); +} +int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags) +{ + return ftw(path, add_dev_1, nopenfd); +} +#else +int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags) +{ + return 0; +} +#endif /* HAVE_FTW */ +#endif /* HAVE_NFTW */ + /* * Find a block device with the right major/minor number. * If we find multiple names, choose the shortest. @@ -464,8 +566,6 @@ char *map_dev(int major, int minor, int create) return nonstd ? nonstd : std; } -#endif - unsigned long calc_csum(void *super, int bytes) { unsigned long long newcsum = 0; @@ -477,7 +577,7 @@ unsigned long calc_csum(void *super, int bytes) newcsum+= superc[i]; csum = (newcsum& 0xffffffff) + (newcsum>>32); #ifdef __alpha__ -/* The in-kernel checksum calculation is always 16bit on +/* The in-kernel checksum calculation is always 16bit on * the alpha, though it is 32 bit on i386... * I wonder what it is elsewhere... (it uses and API in * a way that it shouldn't). @@ -488,6 +588,7 @@ unsigned long calc_csum(void *super, int bytes) return csum; } +#ifndef MDASSEMBLE char *human_size(long long bytes) { static char buf[30]; @@ -522,7 +623,6 @@ char *human_size(long long bytes) char *human_size_brief(long long bytes) { static char buf[30]; - if (bytes < 5000*1024) snprintf(buf, sizeof(buf), "%ld.%02ldKiB", @@ -541,6 +641,41 @@ char *human_size_brief(long long bytes) return buf; } +void print_r10_layout(int layout) +{ + int near = layout & 255; + int far = (layout >> 8) & 255; + int offset = (layout&0x10000); + char *sep = ""; + + if (near != 1) { + printf("%s near=%d", sep, near); + sep = ","; + } + if (far != 1) + printf("%s %s=%d", sep, offset?"offset":"far", far); + if (near*far == 1) + printf("NO REDUNDANCY"); +} +#endif + +unsigned long long calc_array_size(int level, int raid_disks, int layout, + int chunksize, unsigned long long devsize) +{ + int data_disks = 0; + switch (level) { + case 0: data_disks = raid_disks; break; + case 1: data_disks = 1; break; + case 4: + case 5: data_disks = raid_disks - 1; break; + case 6: data_disks = raid_disks - 2; break; + case 10: data_disks = raid_disks / (layout & 255) / ((layout>>8)&255); + break; + } + devsize &= ~(unsigned long long)((chunksize>>9)-1); + return data_disks * devsize; +} + int get_mdp_major(void) { static int mdp_major = -1; @@ -569,8 +704,7 @@ static int mdp_major = -1; return mdp_major; } - - +#if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) char *get_md_name(int dev) { /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */ @@ -625,6 +759,30 @@ void put_md_name(char *name) unlink(name); } +int find_free_devnum(int use_partitions) +{ + int devnum; + for (devnum = 127; devnum != 128; + devnum = devnum ? devnum-1 : (1<<22)-1) { + char *dn; + int _devnum; + + _devnum = use_partitions ? (-1-devnum) : devnum; + if (mddev_busy(_devnum)) + continue; + /* make sure it is new to /dev too, at least as a + * non-standard */ + dn = map_dev(dev2major(_devnum), dev2minor(_devnum), 0); + if (dn && ! is_standard(dn, NULL)) + continue; + break; + } + if (devnum == 128) + return NoMdDev; + return use_partitions ? (-1-devnum) : devnum; +} +#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */ + int dev_open(char *dev, int flags) { /* like 'open', but if 'dev' matches %d:%d, create a temp @@ -642,32 +800,131 @@ int dev_open(char *dev, int flags) if (e > dev && *e == ':' && e[1] && (minor = strtoul(e+1, &e, 0)) >= 0 && *e == 0) { - snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d", major, minor); + snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d:%d", + (int)getpid(), major, minor); if (mknod(devname, S_IFBLK|0600, makedev(major, minor))==0) { - fd = open(devname, flags); + fd = open(devname, flags|O_DIRECT); unlink(devname); } } else - fd = open(dev, flags); + fd = open(dev, flags|O_DIRECT); return fd; } -struct superswitch *superlist[] = { &super0, &super1, NULL }; +int open_dev_excl(int devnum) +{ + char buf[20]; + int i; + + sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum)); + for (i=0 ; i<25 ; i++) { + int fd = dev_open(buf, O_RDWR|O_EXCL); + if (fd >= 0) + return fd; + if (errno != EBUSY) + return fd; + usleep(200000); + } + return -1; +} + +int same_dev(char *one, char *two) +{ + struct stat st1, st2; + if (stat(one, &st1) != 0) + return 0; + if (stat(two, &st2) != 0) + return 0; + if ((st1.st_mode & S_IFMT) != S_IFBLK) + return 0; + if ((st2.st_mode & S_IFMT) != S_IFBLK) + return 0; + return st1.st_rdev == st2.st_rdev; +} + +struct superswitch *superlist[] = { &super0, &super1, &super_ddf, &super_imsm, NULL }; + +#if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) -struct supertype *super_by_version(int vers, int minor) +struct supertype *super_by_fd(int fd) { - struct supertype *st = malloc(sizeof(*st)); - if (!st) return st; - if (vers == 0) { - st->ss = &super0; - st->max_devs = MD_SB_DISKS; + mdu_array_info_t array; + int vers; + int minor; + struct supertype *st = NULL; + struct mdinfo *sra; + char *verstr; + char version[20]; + int i; + char *subarray = NULL; + + sra = sysfs_read(fd, 0, GET_VERSION); + + if (sra) { + vers = sra->array.major_version; + minor = sra->array.minor_version; + verstr = sra->text_version; + } else { + if (ioctl(fd, GET_ARRAY_INFO, &array)) + array.major_version = array.minor_version = 0; + vers = array.major_version; + minor = array.minor_version; + verstr = ""; + } + + if (vers != -1) { + sprintf(version, "%d.%d", vers, minor); + verstr = version; + } + if (minor == -2 && is_subarray(verstr)) { + char *dev = verstr+1; + subarray = strchr(dev, '/'); + int devnum; + if (subarray) + *subarray++ = '\0'; + devnum = devname2devnum(dev); + subarray = strdup(subarray); + if (sra) + sysfs_free(sra); + sra = sysfs_read(-1, devnum, GET_VERSION); + verstr = sra->text_version ? : "-no-metadata-"; } - if (vers == 1) { - st->ss = &super1; - st->max_devs = 384; + for (i = 0; st == NULL && superlist[i] ; i++) + st = superlist[i]->match_metadata_desc(verstr); + + if (sra) + sysfs_free(sra); + if (st) { + st->sb = NULL; + if (subarray) { + strncpy(st->subarray, subarray, 32); + st->subarray[31] = 0; + free(subarray); + } else + st->subarray[0] = 0; } - st->minor_version = minor; + return st; +} +#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */ + + +struct supertype *dup_super(struct supertype *orig) +{ + struct supertype *st; + + if (!orig) + return orig; + st = malloc(sizeof(*st)); + if (!st) + return st; + memset(st, 0, sizeof(*st)); + st->ss = orig->ss; + st->max_devs = orig->max_devs; + st->minor_version = orig->minor_version; + strcpy(st->subarray, orig->subarray); + st->sb = NULL; + st->info = NULL; return st; } @@ -680,34 +937,31 @@ struct supertype *guess_super(int fd) struct supertype *st; unsigned long besttime = 0; int bestsuper = -1; - - void *sbp = NULL; int i; st = malloc(sizeof(*st)); - memset(st, 0, sizeof(*st)); for (i=0 ; superlist[i]; i++) { int rv; ss = superlist[i]; - st->ss = NULL; - rv = ss->load_super(st, fd, &sbp, NULL); + memset(st, 0, sizeof(*st)); + rv = ss->load_super(st, fd, NULL); if (rv == 0) { struct mdinfo info; - ss->getinfo_super(&info, sbp); + st->ss->getinfo_super(st, &info); if (bestsuper == -1 || besttime < info.array.ctime) { bestsuper = i; besttime = info.array.ctime; } - free(sbp); + ss->free_super(st); } } if (bestsuper != -1) { int rv; - st->ss = NULL; - rv = superlist[bestsuper]->load_super(st, fd, &sbp, NULL); + memset(st, 0, sizeof(*st)); + rv = superlist[bestsuper]->load_super(st, fd, NULL); if (rv == 0) { - free(sbp); + superlist[bestsuper]->free_super(st); return st; } } @@ -715,6 +969,351 @@ struct supertype *guess_super(int fd) return NULL; } +/* Return size of device in bytes */ +int get_dev_size(int fd, char *dname, unsigned long long *sizep) +{ + unsigned long long ldsize; + struct stat st; + + if (fstat(fd, &st) != -1 && S_ISREG(st.st_mode)) + ldsize = (unsigned long long)st.st_size; + else +#ifdef BLKGETSIZE64 + if (ioctl(fd, BLKGETSIZE64, &ldsize) != 0) +#endif + { + unsigned long dsize; + if (ioctl(fd, BLKGETSIZE, &dsize) == 0) { + ldsize = dsize; + ldsize <<= 9; + } else { + if (dname) + fprintf(stderr, Name ": Cannot get size of %s: %s\b", + dname, strerror(errno)); + return 0; + } + } + *sizep = ldsize; + return 1; +} + +void get_one_disk(int mdfd, mdu_array_info_t *ainf, mdu_disk_info_t *disk) +{ + int d; + ioctl(mdfd, GET_ARRAY_INFO, ainf); + for (d = 0 ; d < ainf->raid_disks + ainf->nr_disks ; d++) + if (ioctl(mdfd, GET_DISK_INFO, disk) == 0) + return; +} + +int open_container(int fd) +{ + /* 'fd' is a block device. Find out if it is in use + * by a container, and return an open fd on that container. + */ + char path[256]; + char *e; + DIR *dir; + struct dirent *de; + int dfd, n; + char buf[200]; + int major, minor; + struct stat st; + + if (fstat(fd, &st) != 0) + return -1; + sprintf(path, "/sys/dev/block/%d:%d/holders", + (int)major(st.st_rdev), (int)minor(st.st_rdev)); + e = path + strlen(path); + + dir = opendir(path); + if (!dir) + return -1; + while ((de = readdir(dir))) { + if (de->d_ino == 0) + continue; + if (de->d_name[0] == '.') + continue; + sprintf(e, "/%s/dev", de->d_name); + dfd = open(path, O_RDONLY); + if (dfd < 0) + continue; + n = read(dfd, buf, sizeof(buf)); + close(dfd); + if (n <= 0 || n >= sizeof(buf)) + continue; + buf[n] = 0; + if (sscanf(buf, "%d:%d", &major, &minor) != 2) + continue; + sprintf(buf, "%d:%d", major, minor); + dfd = dev_open(buf, O_RDONLY); + if (dfd >= 0) { + closedir(dir); + return dfd; + } + } + closedir(dir); + return -1; +} + +int add_disk(int mdfd, struct supertype *st, + struct mdinfo *sra, struct mdinfo *info) +{ + /* Add a device to an array, in one of 2 ways. */ + int rv; +#ifndef MDASSEMBLE + if (st->ss->external) { + rv = sysfs_add_disk(sra, info); + if (! rv) { + struct mdinfo *sd2; + for (sd2 = sra->devs; sd2; sd2=sd2->next) + if (sd2 == info) + break; + if (sd2 == NULL) { + sd2 = malloc(sizeof(*sd2)); + *sd2 = *info; + sd2->next = sra->devs; + sra->devs = sd2; + } + } + } else +#endif + rv = ioctl(mdfd, ADD_NEW_DISK, &info->disk); + return rv; +} + +int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info) +{ + /* Initialise kernel's knowledge of array. + * This varies between externally managed arrays + * and older kernels + */ + int vers = md_get_version(mdfd); + int rv; + +#ifndef MDASSEMBLE + if (st->ss->external) + rv = sysfs_set_array(info, vers); + else +#endif + if ((vers % 100) >= 1) { /* can use different versions */ + mdu_array_info_t inf; + memset(&inf, 0, sizeof(inf)); + inf.major_version = info->array.major_version; + inf.minor_version = info->array.minor_version; + rv = ioctl(mdfd, SET_ARRAY_INFO, &inf); + } else + rv = ioctl(mdfd, SET_ARRAY_INFO, NULL); + return rv; +} + +char *devnum2devname(int num) +{ + char name[100]; + if (num > 0) + sprintf(name, "md%d", num); + else + sprintf(name, "md_d%d", -1-num); + return strdup(name); +} + +int devname2devnum(char *name) +{ + char *ep; + int num; + if (strncmp(name, "md_d", 4)==0) + num = -1-strtoul(name+4, &ep, 10); + else + num = strtoul(name+2, &ep, 10); + return num; +} + +int stat2devnum(struct stat *st) +{ + char path[30]; + char link[200]; + char *cp; + int n; + + if ((S_IFMT & st->st_mode) == S_IFBLK) { + if (major(st->st_rdev) == MD_MAJOR) + return minor(st->st_rdev); + else if (major(st->st_rdev) == get_mdp_major()) + return -1- (minor(st->st_rdev)>>MdpMinorShift); + + /* must be an extended-minor partition. Look at the + * /sys/dev/block/%d:%d link which must look like + * ../../block/mdXXX/mdXXXpYY + */ + sprintf(path, "/sys/dev/block/%d:%d", major(st->st_rdev), + minor(st->st_rdev)); + n = readlink(path, link, sizeof(link)-1); + if (n <= 0) + return NoMdDev; + link[n] = 0; + cp = strrchr(link, '/'); + if (cp) *cp = 0; + cp = strchr(link, '/'); + if (cp && strncmp(cp, "/md", 3) == 0) + return devname2devnum(cp+1); + } + return NoMdDev; + +} + +int fd2devnum(int fd) +{ + struct stat stb; + if (fstat(fd, &stb) == 0) + return stat2devnum(&stb); + return NoMdDev; +} + +int mdmon_running(int devnum) +{ + char path[100]; + char pid[10]; + int fd; + int n; + sprintf(path, "/var/run/mdadm/%s.pid", devnum2devname(devnum)); + fd = open(path, O_RDONLY, 0); + + if (fd < 0) + return 0; + n = read(fd, pid, 9); + close(fd); + if (n <= 0) + return 0; + if (kill(atoi(pid), 0) == 0) + return 1; + return 0; +} + +int signal_mdmon(int devnum) +{ + char path[100]; + char pid[10]; + int fd; + int n; + sprintf(path, "/var/run/mdadm/%s.pid", devnum2devname(devnum)); + fd = open(path, O_RDONLY, 0); + + if (fd < 0) + return 0; + n = read(fd, pid, 9); + close(fd); + if (n <= 0) + return 0; + if (kill(atoi(pid), SIGUSR1) == 0) + return 1; + return 0; +} + +int start_mdmon(int devnum) +{ + int i; + int len; + pid_t pid; + int status; + char pathbuf[1024]; + char *paths[4] = { + pathbuf, + "/sbin/mdmon", + "mdmon", + NULL + }; + + if (check_env("MDADM_NO_MDMON")) + return 0; + + len = readlink("/proc/self/exe", pathbuf, sizeof(pathbuf)); + if (len > 0) { + char *sl; + pathbuf[len] = 0; + sl = strrchr(pathbuf, '/'); + if (sl) + sl++; + else + sl = pathbuf; + strcpy(sl, "mdmon"); + } else + pathbuf[0] = '\0'; + + switch(fork()) { + case 0: + /* FIXME yuk. CLOSE_EXEC?? */ + for (i=3; i < 100; i++) + close(i); + for (i=0; paths[i]; i++) + if (paths[i][0]) + execl(paths[i], "mdmon", + map_dev(dev2major(devnum), + dev2minor(devnum), + 1), NULL); + exit(1); + case -1: fprintf(stderr, Name ": cannot run mdmon. " + "Array remains readonly\n"); + return -1; + default: /* parent - good */ + pid = wait(&status); + if (pid < 0 || status != 0) + return -1; + } + return 0; +} + +int check_env(char *name) +{ + char *val = getenv(name); + + if (val && atoi(val) == 1) + return 1; + + return 0; +} + +#ifndef MDASSEMBLE +int flush_metadata_updates(struct supertype *st) +{ + int sfd; + if (!st->updates) { + st->update_tail = NULL; + return -1; + } + + sfd = connect_monitor(devnum2devname(st->container_dev)); + if (sfd < 0) + return -1; + + while (st->updates) { + struct metadata_update *mu = st->updates; + st->updates = mu->next; + + send_message(sfd, mu, 0); + wait_reply(sfd, 0); + free(mu->buf); + free(mu); + } + ack(sfd, 0); + wait_reply(sfd, 0); + close(sfd); + st->update_tail = NULL; + return 0; +} + +void append_metadata_update(struct supertype *st, void *buf, int len) +{ + + struct metadata_update *mu = malloc(sizeof(*mu)); + + mu->buf = buf; + mu->len = len; + mu->space = NULL; + mu->next = NULL; + *st->update_tail = mu; + st->update_tail = &mu->next; +} +#endif /* MDASSEMBLE */ #ifdef __TINYC__ /* tinyc doesn't optimize this check in ioctl.h out ... */