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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 17:42:59 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 17:42:59 +0000
commit0c7a6eb5ccace1d8e9f7b301f6a61a7d3f016369 (patch)
tree80a778fbd7bb3c7858cfac572df1cb08cfa4f988 /Create.c
parentInitial commit. (diff)
downloadmdadm-0c7a6eb5ccace1d8e9f7b301f6a61a7d3f016369.tar.xz
mdadm-0c7a6eb5ccace1d8e9f7b301f6a61a7d3f016369.zip
Adding upstream version 4.2.upstream/4.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'Create.c')
-rw-r--r--Create.c1118
1 files changed, 1118 insertions, 0 deletions
diff --git a/Create.c b/Create.c
new file mode 100644
index 0000000..0ff1922
--- /dev/null
+++ b/Create.c
@@ -0,0 +1,1118 @@
+/*
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2001-2013 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>
+ */
+
+#include "mdadm.h"
+#include "md_u.h"
+#include "md_p.h"
+#include <ctype.h>
+
+static int round_size_and_verify(unsigned long long *size, int chunk)
+{
+ if (*size == 0)
+ return 0;
+ *size &= ~(unsigned long long)(chunk - 1);
+ if (*size == 0) {
+ pr_err("Size cannot be smaller than chunk.\n");
+ return 1;
+ }
+ return 0;
+}
+
+static int default_layout(struct supertype *st, int level, int verbose)
+{
+ int layout = UnSet;
+
+ if (st && st->ss->default_geometry)
+ st->ss->default_geometry(st, &level, &layout, NULL);
+
+ if (layout == UnSet)
+ switch(level) {
+ default: /* no layout */
+ layout = 0;
+ break;
+ case 0:
+ layout = RAID0_ORIG_LAYOUT;
+ break;
+ case 10:
+ layout = 0x102; /* near=2, far=1 */
+ if (verbose > 0)
+ pr_err("layout defaults to n2\n");
+ break;
+ case 5:
+ case 6:
+ layout = map_name(r5layout, "default");
+ if (verbose > 0)
+ pr_err("layout defaults to %s\n", map_num(r5layout, layout));
+ break;
+ case LEVEL_FAULTY:
+ layout = map_name(faultylayout, "default");
+
+ if (verbose > 0)
+ pr_err("layout defaults to %s\n", map_num(faultylayout, layout));
+ break;
+ }
+
+ return layout;
+}
+
+int Create(struct supertype *st, char *mddev,
+ char *name, int *uuid,
+ int subdevs, struct mddev_dev *devlist,
+ struct shape *s,
+ struct context *c, unsigned long long data_offset)
+{
+ /*
+ * Create a new raid array.
+ *
+ * First check that necessary details are available
+ * (i.e. level, raid-disks)
+ *
+ * Then check each disk to see what might be on it
+ * and report anything interesting.
+ *
+ * If anything looks odd, and runstop not set,
+ * abort.
+ *
+ * SET_ARRAY_INFO and ADD_NEW_DISK, and
+ * if runstop==run, or raiddisks disks were used,
+ * RUN_ARRAY
+ */
+ int mdfd;
+ unsigned long long minsize = 0, maxsize = 0;
+ char *mindisc = NULL;
+ char *maxdisc = NULL;
+ int dnum, raid_disk_num;
+ struct mddev_dev *dv;
+ dev_t rdev;
+ int fail = 0, warn = 0;
+ int first_missing = subdevs * 2;
+ int second_missing = subdevs * 2;
+ int missing_disks = 0;
+ int insert_point = subdevs * 2; /* where to insert a missing drive */
+ int total_slots;
+ int pass;
+ int rv;
+ int bitmap_fd;
+ int have_container = 0;
+ int container_fd = -1;
+ int need_mdmon = 0;
+ unsigned long long bitmapsize;
+ struct mdinfo info, *infos;
+ int did_default = 0;
+ int do_default_layout = 0;
+ int do_default_chunk = 0;
+ unsigned long safe_mode_delay = 0;
+ char chosen_name[1024];
+ struct map_ent *map = NULL;
+ unsigned long long newsize;
+ mdu_array_info_t inf;
+
+ int major_num = BITMAP_MAJOR_HI;
+ if (s->bitmap_file && strcmp(s->bitmap_file, "clustered") == 0) {
+ major_num = BITMAP_MAJOR_CLUSTERED;
+ if (c->nodes <= 1) {
+ pr_err("At least 2 nodes are needed for cluster-md\n");
+ return 1;
+ }
+ }
+
+ memset(&info, 0, sizeof(info));
+ if (s->level == UnSet && st && st->ss->default_geometry)
+ st->ss->default_geometry(st, &s->level, NULL, NULL);
+ if (s->level == UnSet) {
+ pr_err("a RAID level is needed to create an array.\n");
+ return 1;
+ }
+ if (s->raiddisks < 4 && s->level == 6) {
+ pr_err("at least 4 raid-devices needed for level 6\n");
+ return 1;
+ }
+ if (s->raiddisks > 256 && s->level == 6) {
+ pr_err("no more than 256 raid-devices supported for level 6\n");
+ return 1;
+ }
+ if (s->raiddisks < 2 && s->level >= 4) {
+ pr_err("at least 2 raid-devices needed for level %d\n", s->level);
+ return 1;
+ }
+ if (s->level <= 0 && s->sparedisks) {
+ pr_err("This level does not support spare devices\n");
+ return 1;
+ }
+
+ if (subdevs == 1 && strcmp(devlist->devname, "missing") != 0) {
+ /* If given a single device, it might be a container, and we can
+ * extract a device list from there
+ */
+ int fd;
+
+ memset(&inf, 0, sizeof(inf));
+ fd = open(devlist->devname, O_RDONLY);
+ if (fd >= 0 &&
+ md_get_array_info(fd, &inf) == 0 && inf.raid_disks == 0) {
+ /* yep, looks like a container */
+ if (st) {
+ rv = st->ss->load_container(st, fd,
+ devlist->devname);
+ if (rv == 0)
+ have_container = 1;
+ } else {
+ st = super_by_fd(fd, NULL);
+ if (st && !(rv = st->ss->
+ load_container(st, fd,
+ devlist->devname)))
+ have_container = 1;
+ else
+ st = NULL;
+ }
+ if (have_container) {
+ subdevs = s->raiddisks;
+ first_missing = subdevs * 2;
+ second_missing = subdevs * 2;
+ insert_point = subdevs * 2;
+ }
+ }
+ if (fd >= 0)
+ close(fd);
+ }
+ if (st && st->ss->external && s->sparedisks) {
+ pr_err("This metadata type does not support spare disks at create time\n");
+ return 1;
+ }
+ if (subdevs > s->raiddisks+s->sparedisks+s->journaldisks) {
+ pr_err("You have listed more devices (%d) than are in the array(%d)!\n", subdevs, s->raiddisks+s->sparedisks);
+ return 1;
+ }
+ if (!have_container && subdevs < s->raiddisks+s->sparedisks+s->journaldisks) {
+ pr_err("You haven't given enough devices (real or missing) to create this array\n");
+ return 1;
+ }
+ if (s->bitmap_file && s->level <= 0) {
+ pr_err("bitmaps not meaningful with level %s\n",
+ map_num(pers, s->level)?:"given");
+ return 1;
+ }
+
+ /* now set some defaults */
+
+ if (s->layout == UnSet) {
+ do_default_layout = 1;
+ s->layout = default_layout(st, s->level, c->verbose);
+ }
+
+ if (s->level == 10)
+ /* check layout fits in array*/
+ if ((s->layout&255) * ((s->layout>>8)&255) > s->raiddisks) {
+ pr_err("that layout requires at least %d devices\n",
+ (s->layout&255) * ((s->layout>>8)&255));
+ return 1;
+ }
+
+ switch(s->level) {
+ case 4:
+ case 5:
+ case 10:
+ case 6:
+ case 0:
+ if (s->chunk == 0 || s->chunk == UnSet) {
+ s->chunk = UnSet;
+ do_default_chunk = 1;
+ /* chunk will be set later */
+ }
+ break;
+ case LEVEL_LINEAR:
+ /* a chunksize of zero 0s perfectly valid (and preferred) since 2.6.16 */
+ if (get_linux_version() < 2006016 && s->chunk == 0) {
+ s->chunk = 64;
+ if (c->verbose > 0)
+ pr_err("chunk size defaults to 64K\n");
+ }
+ break;
+ case 1:
+ case LEVEL_FAULTY:
+ case LEVEL_MULTIPATH:
+ case LEVEL_CONTAINER:
+ if (s->chunk) {
+ pr_err("specifying chunk size is forbidden for this level\n");
+ return 1;
+ }
+ break;
+ default:
+ pr_err("unknown level %d\n", s->level);
+ return 1;
+ }
+
+ if (s->size == MAX_SIZE)
+ /* use '0' to mean 'max' now... */
+ s->size = 0;
+ if (s->size && s->chunk && s->chunk != UnSet)
+ if (round_size_and_verify(&s->size, s->chunk))
+ return 1;
+
+ newsize = s->size * 2;
+ if (st && ! st->ss->validate_geometry(st, s->level, s->layout, s->raiddisks,
+ &s->chunk, s->size*2,
+ data_offset, NULL,
+ &newsize, s->consistency_policy,
+ c->verbose >= 0))
+ return 1;
+
+ if (s->chunk && s->chunk != UnSet) {
+ newsize &= ~(unsigned long long)(s->chunk*2 - 1);
+ if (do_default_chunk) {
+ /* default chunk was just set */
+ if (c->verbose > 0)
+ pr_err("chunk size defaults to %dK\n", s->chunk);
+ if (round_size_and_verify(&s->size, s->chunk))
+ return 1;
+ do_default_chunk = 0;
+ }
+ }
+
+ if (s->size == 0) {
+ s->size = newsize / 2;
+ if (s->level == 1)
+ /* If this is ever reshaped to RAID5, we will
+ * need a chunksize. So round it off a bit
+ * now just to be safe
+ */
+ s->size &= ~(64ULL-1);
+
+ if (s->size && c->verbose > 0)
+ pr_err("setting size to %lluK\n", s->size);
+ }
+
+ /* now look at the subdevs */
+ info.array.active_disks = 0;
+ info.array.working_disks = 0;
+ dnum = 0;
+ for (dv = devlist; dv; dv = dv->next)
+ if (data_offset == VARIABLE_OFFSET)
+ dv->data_offset = INVALID_SECTORS;
+ else
+ dv->data_offset = data_offset;
+
+ for (dv=devlist; dv && !have_container; dv=dv->next, dnum++) {
+ char *dname = dv->devname;
+ unsigned long long freesize;
+ int dfd;
+ char *doff;
+
+ if (strcasecmp(dname, "missing") == 0) {
+ if (first_missing > dnum)
+ first_missing = dnum;
+ if (second_missing > dnum && dnum > first_missing)
+ second_missing = dnum;
+ missing_disks ++;
+ continue;
+ }
+ if (data_offset == VARIABLE_OFFSET) {
+ doff = strchr(dname, ':');
+ if (doff) {
+ *doff++ = 0;
+ dv->data_offset = parse_size(doff);
+ } else
+ dv->data_offset = INVALID_SECTORS;
+ } else
+ dv->data_offset = data_offset;
+
+ dfd = open(dname, O_RDONLY);
+ if (dfd < 0) {
+ pr_err("cannot open %s: %s\n",
+ dname, strerror(errno));
+ exit(2);
+ }
+ if (!fstat_is_blkdev(dfd, dname, NULL)) {
+ close(dfd);
+ exit(2);
+ }
+ close(dfd);
+ info.array.working_disks++;
+ if (dnum < s->raiddisks && dv->disposition != 'j')
+ info.array.active_disks++;
+ if (st == NULL) {
+ struct createinfo *ci = conf_get_create_info();
+ if (ci)
+ st = ci->supertype;
+ }
+ if (st == NULL) {
+ /* Need to choose a default metadata, which is different
+ * depending on geometry of array.
+ */
+ int i;
+ char *name = "default";
+ for(i = 0; !st && superlist[i]; i++) {
+ st = superlist[i]->match_metadata_desc(name);
+ if (!st)
+ continue;
+ if (do_default_layout)
+ s->layout = default_layout(st, s->level, c->verbose);
+ switch (st->ss->validate_geometry(
+ st, s->level, s->layout, s->raiddisks,
+ &s->chunk, s->size*2,
+ dv->data_offset, dname,
+ &freesize, s->consistency_policy,
+ c->verbose > 0)) {
+ case -1: /* Not valid, message printed, and not
+ * worth checking any further */
+ exit(2);
+ break;
+ case 0: /* Geometry not valid */
+ free(st);
+ st = NULL;
+ s->chunk = do_default_chunk ? UnSet : s->chunk;
+ break;
+ case 1: /* All happy */
+ break;
+ }
+ }
+
+ if (!st) {
+ int dfd = open(dname, O_RDONLY|O_EXCL);
+ if (dfd < 0) {
+ pr_err("cannot open %s: %s\n",
+ dname, strerror(errno));
+ exit(2);
+ }
+ pr_err("device %s not suitable for any style of array\n",
+ dname);
+ exit(2);
+ }
+ if (st->ss != &super0 ||
+ st->minor_version != 90)
+ did_default = 1;
+ } else {
+ if (do_default_layout)
+ s->layout = default_layout(st, s->level, 0);
+ if (!st->ss->validate_geometry(st, s->level, s->layout,
+ s->raiddisks,
+ &s->chunk, s->size*2,
+ dv->data_offset,
+ dname, &freesize,
+ s->consistency_policy,
+ c->verbose >= 0)) {
+
+ pr_err("%s is not suitable for this array.\n",
+ dname);
+ fail = 1;
+ continue;
+ }
+ }
+
+ if (dv->disposition == 'j')
+ goto skip_size_check; /* skip write journal for size check */
+
+ freesize /= 2; /* convert to K */
+ if (s->chunk && s->chunk != UnSet) {
+ /* round to chunk size */
+ freesize = freesize & ~(s->chunk-1);
+ if (do_default_chunk) {
+ /* default chunk was just set */
+ if (c->verbose > 0)
+ pr_err("chunk size defaults to %dK\n", s->chunk);
+ if (round_size_and_verify(&s->size, s->chunk))
+ return 1;
+ do_default_chunk = 0;
+ }
+ }
+ if (!freesize) {
+ pr_err("no free space left on %s\n", dname);
+ fail = 1;
+ continue;
+ }
+
+ if (s->size && freesize < s->size) {
+ pr_err("%s is smaller than given size. %lluK < %lluK + metadata\n",
+ dname, freesize, s->size);
+ fail = 1;
+ continue;
+ }
+ if (maxdisc == NULL || (maxdisc && freesize > maxsize)) {
+ maxdisc = dname;
+ maxsize = freesize;
+ }
+ if (mindisc ==NULL || (mindisc && freesize < minsize)) {
+ mindisc = dname;
+ minsize = freesize;
+ }
+ skip_size_check:
+ if (c->runstop != 1 || c->verbose >= 0) {
+ int fd = open(dname, O_RDONLY);
+ if (fd < 0) {
+ pr_err("Cannot open %s: %s\n",
+ dname, strerror(errno));
+ fail = 1;
+ continue;
+ }
+ warn |= check_ext2(fd, dname);
+ warn |= check_reiser(fd, dname);
+ warn |= check_raid(fd, dname);
+ if (strcmp(st->ss->name, "1.x") == 0 &&
+ st->minor_version >= 1)
+ /* metadata at front */
+ warn |= check_partitions(fd, dname, 0, 0);
+ else if (s->level == 1 || s->level == LEVEL_CONTAINER ||
+ (s->level == 0 && s->raiddisks == 1))
+ /* partitions could be meaningful */
+ warn |= check_partitions(fd, dname, freesize*2, s->size*2);
+ else
+ /* partitions cannot be meaningful */
+ warn |= check_partitions(fd, dname, 0, 0);
+ if (strcmp(st->ss->name, "1.x") == 0 &&
+ st->minor_version >= 1 &&
+ did_default &&
+ s->level == 1 &&
+ (warn & 1024) == 0) {
+ warn |= 1024;
+ pr_err("Note: this array has metadata at the start and\n"
+ " may not be suitable as a boot device. If you plan to\n"
+ " store '/boot' on this device please ensure that\n"
+ " your boot-loader understands md/v1.x metadata, or use\n"
+ " --metadata=0.90\n");
+ }
+ close(fd);
+ }
+ }
+ if (missing_disks == dnum && !have_container) {
+ pr_err("Subdevs can't be all missing\n");
+ return 1;
+ }
+ if (s->raiddisks + s->sparedisks > st->max_devs) {
+ pr_err("Too many devices: %s metadata only supports %d\n",
+ st->ss->name, st->max_devs);
+ return 1;
+ }
+ if (have_container)
+ info.array.working_disks = s->raiddisks;
+ if (fail) {
+ pr_err("create aborted\n");
+ return 1;
+ }
+ if (s->size == 0) {
+ if (mindisc == NULL && !have_container) {
+ pr_err("no size and no drives given - aborting create.\n");
+ return 1;
+ }
+ if (s->level > 0 || s->level == LEVEL_MULTIPATH ||
+ s->level == LEVEL_FAULTY || st->ss->external) {
+ /* size is meaningful */
+ if (!st->ss->validate_geometry(st, s->level, s->layout,
+ s->raiddisks,
+ &s->chunk, minsize*2,
+ data_offset,
+ NULL, NULL,
+ s->consistency_policy, 0)) {
+ pr_err("devices too large for RAID level %d\n", s->level);
+ return 1;
+ }
+ s->size = minsize;
+ if (s->level == 1)
+ /* If this is ever reshaped to RAID5, we will
+ * need a chunksize. So round it off a bit
+ * now just to be safe
+ */
+ s->size &= ~(64ULL-1);
+ if (c->verbose > 0)
+ pr_err("size set to %lluK\n", s->size);
+ }
+ }
+
+ if (!s->bitmap_file &&
+ !st->ss->external &&
+ s->level >= 1 &&
+ st->ss->add_internal_bitmap &&
+ s->journaldisks == 0 &&
+ (s->consistency_policy != CONSISTENCY_POLICY_RESYNC &&
+ s->consistency_policy != CONSISTENCY_POLICY_PPL) &&
+ (s->write_behind || s->size > 100*1024*1024ULL)) {
+ if (c->verbose > 0)
+ pr_err("automatically enabling write-intent bitmap on large array\n");
+ s->bitmap_file = "internal";
+ }
+ if (s->bitmap_file && strcmp(s->bitmap_file, "none") == 0)
+ s->bitmap_file = NULL;
+
+ if (s->consistency_policy == CONSISTENCY_POLICY_PPL &&
+ !st->ss->write_init_ppl) {
+ pr_err("%s metadata does not support PPL\n", st->ss->name);
+ return 1;
+ }
+
+ if (!have_container && s->level > 0 && ((maxsize-s->size)*100 > maxsize)) {
+ if (c->runstop != 1 || c->verbose >= 0)
+ pr_err("largest drive (%s) exceeds size (%lluK) by more than 1%%\n",
+ maxdisc, s->size);
+ warn = 1;
+ }
+
+ if (st->ss->detail_platform && st->ss->detail_platform(0, 1, NULL) != 0) {
+ if (c->runstop != 1 || c->verbose >= 0)
+ pr_err("%s unable to enumerate platform support\n"
+ " array may not be compatible with hardware/firmware\n",
+ st->ss->name);
+ warn = 1;
+ }
+ st->nodes = c->nodes;
+ st->cluster_name = c->homecluster;
+
+ if (warn) {
+ if (c->runstop!= 1) {
+ if (!ask("Continue creating array? ")) {
+ pr_err("create aborted.\n");
+ return 1;
+ }
+ } else {
+ if (c->verbose > 0)
+ pr_err("creation continuing despite oddities due to --run\n");
+ }
+ }
+
+ /* If this is raid4/5, we want to configure the last active slot
+ * as missing, so that a reconstruct happens (faster than re-parity)
+ * FIX: Can we do this for raid6 as well?
+ */
+ if (st->ss->external == 0 && s->assume_clean == 0 &&
+ c->force == 0 && first_missing >= s->raiddisks) {
+ switch (s->level) {
+ case 4:
+ case 5:
+ insert_point = s->raiddisks-1;
+ s->sparedisks++;
+ info.array.active_disks--;
+ missing_disks++;
+ break;
+ default:
+ break;
+ }
+ }
+ /* For raid6, if creating with 1 missing drive, make a good drive
+ * into a spare, else the create will fail
+ */
+ if (s->assume_clean == 0 && c->force == 0 && first_missing < s->raiddisks &&
+ st->ss->external == 0 &&
+ second_missing >= s->raiddisks && s->level == 6) {
+ insert_point = s->raiddisks - 1;
+ if (insert_point == first_missing)
+ insert_point--;
+ s->sparedisks ++;
+ info.array.active_disks--;
+ missing_disks++;
+ }
+
+ if (s->level <= 0 && first_missing < subdevs * 2) {
+ pr_err("This level does not support missing devices\n");
+ return 1;
+ }
+
+ /* We need to create the device */
+ map_lock(&map);
+ mdfd = create_mddev(mddev, name, c->autof, LOCAL, chosen_name, 1);
+ if (mdfd < 0) {
+ map_unlock(&map);
+ return 1;
+ }
+ /* verify if chosen_name is not in use,
+ * it could be in conflict with already existing device
+ * e.g. container, array
+ */
+ if (strncmp(chosen_name, "/dev/md/", 8) == 0 &&
+ map_by_name(&map, chosen_name+8) != NULL) {
+ pr_err("Array name %s is in use already.\n",
+ chosen_name);
+ close(mdfd);
+ map_unlock(&map);
+ udev_unblock();
+ return 1;
+ }
+ mddev = chosen_name;
+
+ memset(&inf, 0, sizeof(inf));
+ md_get_array_info(mdfd, &inf);
+ if (inf.working_disks != 0) {
+ pr_err("another array by this name is already running.\n");
+ goto abort_locked;
+ }
+
+ /* Ok, lets try some ioctls */
+
+ info.array.level = s->level;
+ info.array.size = s->size;
+ info.array.raid_disks = s->raiddisks;
+ /* The kernel should *know* what md_minor we are dealing
+ * with, but it chooses to trust me instead. Sigh
+ */
+ info.array.md_minor = 0;
+ if (fstat_is_blkdev(mdfd, mddev, &rdev))
+ info.array.md_minor = minor(rdev);
+ info.array.not_persistent = 0;
+
+ if (((s->level == 4 || s->level == 5) &&
+ (insert_point < s->raiddisks || first_missing < s->raiddisks)) ||
+ (s->level == 6 && (insert_point < s->raiddisks ||
+ second_missing < s->raiddisks)) ||
+ (s->level <= 0) || s->assume_clean) {
+ info.array.state = 1; /* clean, but one+ drive will be missing*/
+ info.resync_start = MaxSector;
+ } else {
+ info.array.state = 0; /* not clean, but no errors */
+ info.resync_start = 0;
+ }
+ if (s->level == 10) {
+ /* for raid10, the bitmap size is the capacity of the array,
+ * which is array.size * raid_disks / ncopies;
+ * .. but convert to sectors.
+ */
+ int ncopies = ((s->layout>>8) & 255) * (s->layout & 255);
+ bitmapsize = s->size * s->raiddisks / ncopies * 2;
+/* printf("bms=%llu as=%d rd=%d nc=%d\n", bitmapsize, s->size, s->raiddisks, ncopies);*/
+ } else
+ bitmapsize = s->size * 2;
+
+ /* There is lots of redundancy in these disk counts,
+ * raid_disks is the most meaningful value
+ * it describes the geometry of the array
+ * it is constant
+ * nr_disks is total number of used slots.
+ * it should be raid_disks+spare_disks
+ * spare_disks is the number of extra disks present
+ * see above
+ * active_disks is the number of working disks in
+ * active slots. (With raid_disks)
+ * working_disks is the total number of working disks,
+ * including spares
+ * failed_disks is the number of disks marked failed
+ *
+ * Ideally, the kernel would keep these (except raid_disks)
+ * up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
+ * So for now, we assume that all raid and spare
+ * devices will be given.
+ */
+ info.array.spare_disks=s->sparedisks;
+ info.array.failed_disks=missing_disks;
+ info.array.nr_disks = info.array.working_disks
+ + info.array.failed_disks;
+ info.array.layout = s->layout;
+ info.array.chunk_size = s->chunk*1024;
+
+ if (name == NULL || *name == 0) {
+ /* base name on mddev */
+ /* /dev/md0 -> 0
+ * /dev/md_d0 -> d0
+ * /dev/md_foo -> foo
+ * /dev/md/1 -> 1
+ * /dev/md/d1 -> d1
+ * /dev/md/home -> home
+ * /dev/mdhome -> home
+ */
+ /* FIXME compare this with rules in create_mddev */
+ name = strrchr(mddev, '/');
+ if (name) {
+ name++;
+ if (strncmp(name, "md_", 3) == 0 &&
+ strlen(name) > 3 && (name-mddev) == 5 /* /dev/ */)
+ name += 3;
+ else if (strncmp(name, "md", 2) == 0 &&
+ strlen(name) > 2 && isdigit(name[2]) &&
+ (name-mddev) == 5 /* /dev/ */)
+ name += 2;
+ }
+ }
+ if (!st->ss->init_super(st, &info.array, s, name, c->homehost, uuid,
+ data_offset))
+ goto abort_locked;
+
+ total_slots = info.array.nr_disks;
+ st->ss->getinfo_super(st, &info, NULL);
+ if (sysfs_init(&info, mdfd, NULL)) {
+ pr_err("unable to initialize sysfs\n");
+ goto abort_locked;
+ }
+
+ if (did_default && c->verbose >= 0) {
+ if (is_subarray(info.text_version)) {
+ char devnm[32];
+ char *ep;
+ struct mdinfo *mdi;
+
+ strncpy(devnm, info.text_version+1, 32);
+ devnm[31] = 0;
+ ep = strchr(devnm, '/');
+ if (ep)
+ *ep = 0;
+
+ mdi = sysfs_read(-1, devnm, GET_VERSION);
+
+ pr_err("Creating array inside %s container %s\n",
+ mdi?mdi->text_version:"managed", devnm);
+ sysfs_free(mdi);
+ } else
+ pr_err("Defaulting to version %s metadata\n", info.text_version);
+ }
+
+ map_update(&map, fd2devnm(mdfd), info.text_version,
+ info.uuid, chosen_name);
+ /* Keep map locked until devices have been added to array
+ * to stop another mdadm from finding and using those devices.
+ */
+
+ if (s->bitmap_file && (strcmp(s->bitmap_file, "internal") == 0 ||
+ strcmp(s->bitmap_file, "clustered") == 0)) {
+ if (!st->ss->add_internal_bitmap) {
+ pr_err("internal bitmaps not supported with %s metadata\n",
+ st->ss->name);
+ goto abort_locked;
+ }
+ if (st->ss->add_internal_bitmap(st, &s->bitmap_chunk,
+ c->delay, s->write_behind,
+ bitmapsize, 1, major_num)) {
+ pr_err("Given bitmap chunk size not supported.\n");
+ goto abort_locked;
+ }
+ s->bitmap_file = NULL;
+ }
+
+ if (sysfs_init(&info, mdfd, NULL)) {
+ pr_err("unable to initialize sysfs\n");
+ goto abort_locked;
+ }
+
+ if (st->ss->external && st->container_devnm[0]) {
+ /* member */
+
+ /* When creating a member, we need to be careful
+ * to negotiate with mdmon properly.
+ * If it is already running, we cannot write to
+ * the devices and must ask it to do that part.
+ * If it isn't running, we write to the devices,
+ * and then start it.
+ * We hold an exclusive open on the container
+ * device to make sure mdmon doesn't exit after
+ * we checked that it is running.
+ *
+ * For now, fail if it is already running.
+ */
+ container_fd = open_dev_excl(st->container_devnm);
+ if (container_fd < 0) {
+ pr_err("Cannot get exclusive open on container - weird.\n");
+ goto abort_locked;
+ }
+ if (mdmon_running(st->container_devnm)) {
+ if (c->verbose)
+ pr_err("reusing mdmon for %s.\n",
+ st->container_devnm);
+ st->update_tail = &st->updates;
+ } else
+ need_mdmon = 1;
+ }
+ rv = set_array_info(mdfd, st, &info);
+ if (rv) {
+ pr_err("failed to set array info for %s: %s\n",
+ mddev, strerror(errno));
+ goto abort_locked;
+ }
+
+ if (s->bitmap_file) {
+ int uuid[4];
+
+ st->ss->uuid_from_super(st, uuid);
+ if (CreateBitmap(s->bitmap_file, c->force, (char*)uuid, s->bitmap_chunk,
+ c->delay, s->write_behind,
+ bitmapsize,
+ major_num)) {
+ goto abort_locked;
+ }
+ bitmap_fd = open(s->bitmap_file, O_RDWR);
+ if (bitmap_fd < 0) {
+ pr_err("weird: %s cannot be opened\n",
+ s->bitmap_file);
+ goto abort_locked;
+ }
+ if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
+ pr_err("Cannot set bitmap file for %s: %s\n",
+ mddev, strerror(errno));
+ goto abort_locked;
+ }
+ }
+
+ infos = xmalloc(sizeof(*infos) * total_slots);
+ enable_fds(total_slots);
+ for (pass = 1; pass <= 2; pass++) {
+ struct mddev_dev *moved_disk = NULL; /* the disk that was moved out of the insert point */
+
+ for (dnum = 0, raid_disk_num = 0, dv = devlist; dv;
+ dv = (dv->next) ? (dv->next) : moved_disk, dnum++) {
+ int fd;
+ struct mdinfo *inf = &infos[dnum];
+
+ if (dnum >= total_slots)
+ abort();
+ if (dnum == insert_point) {
+ raid_disk_num += 1;
+ moved_disk = dv;
+ continue;
+ }
+ if (strcasecmp(dv->devname, "missing") == 0) {
+ raid_disk_num += 1;
+ continue;
+ }
+ if (have_container)
+ moved_disk = NULL;
+ if (have_container && dnum < info.array.raid_disks - 1)
+ /* repeatedly use the container */
+ moved_disk = dv;
+
+ switch(pass) {
+ case 1:
+ *inf = info;
+
+ inf->disk.number = dnum;
+ inf->disk.raid_disk = raid_disk_num++;
+
+ if (dv->disposition == 'j') {
+ inf->disk.raid_disk = MD_DISK_ROLE_JOURNAL;
+ inf->disk.state = (1<<MD_DISK_JOURNAL);
+ raid_disk_num--;
+ } else if (inf->disk.raid_disk < s->raiddisks)
+ inf->disk.state = (1<<MD_DISK_ACTIVE) |
+ (1<<MD_DISK_SYNC);
+ else
+ inf->disk.state = 0;
+
+ if (dv->writemostly == FlagSet) {
+ if (major_num == BITMAP_MAJOR_CLUSTERED) {
+ pr_err("Can not set %s --write-mostly with a clustered bitmap\n",dv->devname);
+ goto abort_locked;
+ } else
+ inf->disk.state |= (1<<MD_DISK_WRITEMOSTLY);
+ }
+ if (dv->failfast == FlagSet)
+ inf->disk.state |= (1<<MD_DISK_FAILFAST);
+
+ if (have_container)
+ fd = -1;
+ else {
+ if (st->ss->external &&
+ st->container_devnm[0])
+ fd = open(dv->devname, O_RDWR);
+ else
+ fd = open(dv->devname, O_RDWR|O_EXCL);
+
+ if (fd < 0) {
+ pr_err("failed to open %s after earlier success - aborting\n",
+ dv->devname);
+ goto abort_locked;
+ }
+ if (!fstat_is_blkdev(fd, dv->devname, &rdev))
+ return 1;
+ inf->disk.major = major(rdev);
+ inf->disk.minor = minor(rdev);
+ }
+ if (fd >= 0)
+ remove_partitions(fd);
+ if (st->ss->add_to_super(st, &inf->disk,
+ fd, dv->devname,
+ dv->data_offset)) {
+ ioctl(mdfd, STOP_ARRAY, NULL);
+ goto abort_locked;
+ }
+ st->ss->getinfo_super(st, inf, NULL);
+ safe_mode_delay = inf->safe_mode_delay;
+
+ if (have_container && c->verbose > 0)
+ pr_err("Using %s for device %d\n",
+ map_dev(inf->disk.major,
+ inf->disk.minor,
+ 0), dnum);
+
+ if (!have_container) {
+ /* getinfo_super might have lost these ... */
+ inf->disk.major = major(rdev);
+ inf->disk.minor = minor(rdev);
+ }
+ break;
+ case 2:
+ inf->errors = 0;
+
+ rv = add_disk(mdfd, st, &info, inf);
+
+ if (rv) {
+ pr_err("ADD_NEW_DISK for %s failed: %s\n",
+ dv->devname, strerror(errno));
+ if (errno == EINVAL &&
+ info.array.level == 0) {
+ pr_err("Possibly your kernel doesn't support RAID0 layouts.\n");
+ pr_err("Either upgrade, or use --layout=dangerous\n");
+ }
+ goto abort_locked;
+ }
+ break;
+ }
+ if (!have_container &&
+ dv == moved_disk && dnum != insert_point) break;
+ }
+ if (pass == 1) {
+ struct mdinfo info_new;
+ struct map_ent *me = NULL;
+
+ /* check to see if the uuid has changed due to these
+ * metadata changes, and if so update the member array
+ * and container uuid. Note ->write_init_super clears
+ * the subarray cursor such that ->getinfo_super once
+ * again returns container info.
+ */
+ st->ss->getinfo_super(st, &info_new, NULL);
+ if (st->ss->external && s->level != LEVEL_CONTAINER &&
+ !same_uuid(info_new.uuid, info.uuid, 0)) {
+ map_update(&map, fd2devnm(mdfd),
+ info_new.text_version,
+ info_new.uuid, chosen_name);
+ me = map_by_devnm(&map, st->container_devnm);
+ }
+
+ if (st->ss->write_init_super(st)) {
+ st->ss->free_super(st);
+ goto abort_locked;
+ }
+ /*
+ * Before activating the array, perform extra steps
+ * required to configure the internal write-intent
+ * bitmap.
+ */
+ if (info_new.consistency_policy ==
+ CONSISTENCY_POLICY_BITMAP &&
+ st->ss->set_bitmap &&
+ st->ss->set_bitmap(st, &info)) {
+ st->ss->free_super(st);
+ goto abort_locked;
+ }
+
+ /* update parent container uuid */
+ if (me) {
+ char *path = xstrdup(me->path);
+
+ st->ss->getinfo_super(st, &info_new, NULL);
+ map_update(&map, st->container_devnm,
+ info_new.text_version,
+ info_new.uuid, path);
+ free(path);
+ }
+
+ flush_metadata_updates(st);
+ st->ss->free_super(st);
+ }
+ }
+ map_unlock(&map);
+ free(infos);
+
+ if (s->level == LEVEL_CONTAINER) {
+ /* No need to start. But we should signal udev to
+ * create links */
+ sysfs_uevent(&info, "change");
+ if (c->verbose >= 0)
+ pr_err("container %s prepared.\n", mddev);
+ wait_for(chosen_name, mdfd);
+ } else if (c->runstop == 1 || subdevs >= s->raiddisks) {
+ if (st->ss->external) {
+ int err;
+ switch(s->level) {
+ case LEVEL_LINEAR:
+ case LEVEL_MULTIPATH:
+ case 0:
+ err = sysfs_set_str(&info, NULL, "array_state",
+ c->readonly
+ ? "readonly"
+ : "active");
+ need_mdmon = 0;
+ break;
+ default:
+ err = sysfs_set_str(&info, NULL, "array_state",
+ "readonly");
+ break;
+ }
+ sysfs_set_safemode(&info, safe_mode_delay);
+ if (err) {
+ pr_err("failed to activate array.\n");
+ ioctl(mdfd, STOP_ARRAY, NULL);
+ goto abort;
+ }
+ } else if (c->readonly &&
+ sysfs_attribute_available(
+ &info, NULL, "array_state")) {
+ if (sysfs_set_str(&info, NULL,
+ "array_state", "readonly") < 0) {
+ pr_err("Failed to start array: %s\n",
+ strerror(errno));
+ ioctl(mdfd, STOP_ARRAY, NULL);
+ goto abort;
+ }
+ } else {
+ /* param is not actually used */
+ mdu_param_t param;
+ if (ioctl(mdfd, RUN_ARRAY, &param)) {
+ pr_err("RUN_ARRAY failed: %s\n",
+ strerror(errno));
+ if (errno == 524 /* ENOTSUP */ &&
+ info.array.level == 0)
+ cont_err("Please use --layout=original or --layout=alternate\n");
+ if (info.array.chunk_size & (info.array.chunk_size-1)) {
+ cont_err("Problem may be that chunk size is not a power of 2\n");
+ }
+ ioctl(mdfd, STOP_ARRAY, NULL);
+ goto abort;
+ }
+ /* if start_ro module parameter is set, array is
+ * auto-read-only, which is bad as the resync won't
+ * start. So lets make it read-write now.
+ */
+ ioctl(mdfd, RESTART_ARRAY_RW, NULL);
+ }
+ if (c->verbose >= 0)
+ pr_err("array %s started.\n", mddev);
+ if (st->ss->external && st->container_devnm[0]) {
+ if (need_mdmon)
+ start_mdmon(st->container_devnm);
+
+ ping_monitor(st->container_devnm);
+ close(container_fd);
+ }
+ wait_for(chosen_name, mdfd);
+ } else {
+ pr_err("not starting array - not enough devices.\n");
+ }
+ udev_unblock();
+ close(mdfd);
+ sysfs_uevent(&info, "change");
+ return 0;
+
+ abort:
+ udev_unblock();
+ map_lock(&map);
+ abort_locked:
+ map_remove(&map, fd2devnm(mdfd));
+ map_unlock(&map);
+
+ if (mdfd >= 0)
+ close(mdfd);
+ return 1;
+}