int rc;
/* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
- if (strcmp(name, "raid_disks") != 0 &&
- strcmp(name, "stripe_cache_size") != 0)
+ if (!container ||
+ (strcmp(name, "raid_disks") != 0 &&
+ strcmp(name, "stripe_cache_size") != 0))
return sysfs_set_num(sra, NULL, name, n);
rc = sysfs_get_str(sra, NULL, "safe_mode_delay", safe, sizeof(safe));
sysfs_set_str(sra, NULL, "sync_max", "max");
}
-static int reshape_container_raid_disks(struct supertype *st,
- char *container, int raid_disks)
-{
- /* for each subarray switch to a raid level that can
- * support the reshape, and set raid disks
- */
- struct mdstat_ent *ent, *e;
- int changed = 0, rv = 0, err = 0;
-
- ent = mdstat_read(1, 0);
- if (!ent) {
- fprintf(stderr, Name ": unable to read /proc/mdstat\n");
- return -1;
- }
-
- changed = 0;
- for (e = ent; e; e = e->next) {
- struct mdinfo *sub, *info;
- unsigned int cache;
- int level, takeover_delta = 0;
- int parity_disks = 1;
- unsigned int odata;
- unsigned long blocks;
- char *subarray;
-
- if (!is_container_member(e, container))
- continue;
- subarray = strchr(e->metadata_version+10, '/')+1;
-
- rv = -1;
- level = map_name(pers, e->level);
- if (level == 0) {
- sub = sysfs_read(-1, e->devnum, GET_VERSION);
- if (!sub)
- break;
- /* metadata records 'orig_level' */
- rv = sysfs_set_num(sub, NULL, "level", 4);
- if (rv < 0) {
- err = errno;
- break;
- }
- /* we want spares to be used for capacity
- * expansion, not rebuild
- */
- takeover_delta = 1;
-
- sysfs_free(sub);
- level = 4;
- }
- rv = -1;
- sub = NULL;
- switch (level) {
- default:
- break;
- case 6:
- parity_disks++;
- case 4:
- case 5:
- sub = sysfs_read(-1, e->devnum, GET_CHUNK|GET_CACHE|GET_DISKS);
- if (!sub)
- break;
- cache = (sub->array.chunk_size / 4096) * 4;
- odata = sub->array.raid_disks - parity_disks;
- blocks = compute_backup_blocks(sub->array.chunk_size,
- sub->array.chunk_size,
- raid_disks - parity_disks,
- odata);
- if (cache < blocks / 8 / odata + 16)
- /* Make it big enough to hold 'blocks' */
- cache = blocks / 8 / odata + 16;
- if (cache > sub->cache_size)
- rv = subarray_set_num(container, sub,
- "stripe_cache_size", cache);
- if (rv) {
- err = errno;
- break;
- }
- rv = -1;
- /* fall through */
- case 1:
- if (!sub)
- sub = sysfs_read(-1, e->devnum, GET_VERSION);
- if (!sub)
- break;
-
- rv = subarray_set_num(container, sub, "raid_disks",
- raid_disks + takeover_delta);
- if (rv)
- err = errno;
- else
- changed++;
- break;
- }
-
- /* add the devices that were chosen */
- info = st->ss->container_content(st, subarray);
- if (info) {
- struct mdinfo *d;
- for (d = info->devs; d; d = d->next) {
- if (d->disk.state == 0 &&
- d->disk.raid_disk >= 0) {
- /* This is a spare that wants to
- * be part of the array.
- */
- add_disk(-1, st, info, d);
- }
- }
- }
- sysfs_free(info);
-
- if (!rv && level > 1)
- start_reshape(sub);
- sysfs_free(sub);
- if (rv)
- break;
- }
- free_mdstat(ent);
- if (rv) {
- fprintf(stderr, Name
- ": failed to initiate container reshape%s%s\n",
- err ? ": " : "", err ? strerror(err) : "");
- return rv;
- }
-
- return changed;
-}
-
-static void revert_container_raid_disks(struct supertype *st, int fd, char *container)
-{
- /* we failed to prepare all subarrays in the container for
- * reshape, so cancel the changes and restore the nominal raid
- * level
- */
- struct mdstat_ent *ent, *e;
-
- ent = mdstat_read(0, 0);
- if (!ent) {
- fprintf(stderr, Name
- ": failed to read /proc/mdstat while aborting reshape\n");
- return;
- }
-
- if (st->ss->load_container(st, fd, NULL)) {
- fprintf(stderr, Name
- ": failed read metadata while aborting reshape\n");
- return ;
- }
-
-
- for (e = ent; e; e = e->next) {
- int level_fixed = 0, disks_fixed = 0;
- struct mdinfo *sub, *prev;
- char *subarray;
-
- if (!is_container_member(e, container))
- continue;
-
- subarray = to_subarray(e, container);
- prev = st->ss->container_content(st, subarray);
-
- /* changing level might change raid_disks so we do it
- * first and then check if raid_disks still needs fixing
- */
- if (map_name(pers, e->level) != prev->array.level) {
- sub = sysfs_read(-1, e->devnum, GET_VERSION);
- if (sub &&
- !sysfs_set_num(sub, NULL, "level", prev->array.level))
- level_fixed = 1;
- sysfs_free(sub);
- } else
- level_fixed = 1;
-
- sub = sysfs_read(-1, e->devnum, GET_DISKS);
- if (sub && sub->array.raid_disks != prev->array.raid_disks) {
- if (!subarray_set_num(container, sub, "raid_disks",
- prev->array.raid_disks))
- disks_fixed = 1;
- } else if (sub)
- disks_fixed = 1;
-
- if (sub)
- abort_reshape(sub);
- sysfs_free(sub);
-
- if (!disks_fixed || !level_fixed)
- fprintf(stderr, Name
- ": failed to restore %s to a %d-disk %s array\n",
- e->dev, prev->array.raid_disks,
- map_num(pers, prev->array.level));
- free(prev);
- }
- st->ss->free_super(st);
- free_mdstat(ent);
-}
-
int remove_disks_on_raid10_to_raid0_takeover(struct supertype *st,
struct mdinfo *sra,
int layout)
return blocks;
}
+/* 'struct reshape' records the intermediate states
+ * a general reshape.
+ * The starting geometry is converted to the 'before' geometry
+ * by at most an atomic level change. They could be the same.
+ * Similarly the 'after' geometry is converted to the final
+ * geometry by at most a level change.
+ * Note that 'before' and 'after' must have the same level.
+ * 'blocks' is the minimum number of sectors for a reshape unit.
+ * This will be a multiple of the stripe size in each of the
+ * 'before' and 'after' geometries.
+ * If 'blocks' is 0, no restriping is necessary.
+ */
+struct reshape {
+ int level;
+ int parity; /* number of parity blocks/devices */
+ struct {
+ int layout;
+ int data_disks;
+ } before, after;
+ unsigned long long blocks;
+ unsigned long long stripes; /* number of old stripes that comprise 'blocks'*/
+ unsigned long long new_size; /* New size of array in sectors */
+};
+
+char *analyse_change(struct mdinfo *info, struct reshape *re)
+{
+ /* Based on the current array state in info->array and
+ * the changes in info->new_* etc, determine:
+ * - whether the change is possible
+ * - Intermediate level/raid_disks/layout
+ * - whether a restriping reshape is needed
+ * - number of sectors in minimum change unit. This
+ * will cover a whole number of stripes in 'before' and
+ * 'after'.
+ *
+ * Return message if the change should be rejected
+ * NULL if the change can be achieved
+ *
+ * This can be called as part of starting a reshape, or
+ * when assembling an array that is undergoing reshape.
+ */
+ int new_disks;
+
+ /* If a new level not explicitly given, we assume no-change */
+ if (info->new_level == UnSet)
+ info->new_level = info->array.level;
+
+ if (info->new_chunk)
+ switch (info->new_level) {
+ case 0:
+ case 4:
+ case 5:
+ case 6:
+ case 10:
+ /* chunk size is meaningful, must divide component_size
+ * evenly
+ */
+ if (info->component_size % (info->new_chunk/512))
+ return "New chunk size does not"
+ " divide component size";
+ break;
+ default:
+ return "chunk size not meaningful for this level";
+ }
+ else
+ info->new_chunk = info->array.chunk_size;
+
+ switch (info->array.level) {
+ case 1:
+ /* RAID1 can convert to RAID1 with different disks, or
+ * raid5 with 2 disks
+ */
+ if (info->new_level == 1) {
+ if (info->delta_disks == UnSet)
+ /* Don't know what to do */
+ return "no change requested for Growing RAID1";
+ re->level = 1;
+ re->before.data_disks = (info->array.raid_disks +
+ info->delta_disks);
+ re->before.layout = 0;
+ re->blocks = 0;
+ re->parity = 0;
+ return NULL;
+ }
+ if (info->array.raid_disks == 2 &&
+ info->array.raid_disks == 5) {
+ /* simple in-place conversion */
+ re->level = 5;
+ re->parity = 1;
+ re->before.data_disks = 1;
+ re->before.layout = ALGORITHM_LEFT_SYMMETRIC;
+ re->blocks = 0;
+ return NULL;
+ }
+ /* Could do some multi-stage conversions, but leave that to
+ * later.
+ */
+ return "Impossibly level change request for RAID1";
+
+ case 10:
+ /* RAID10 can only be converted from near mode to
+ * RAID0 by removing some devices
+ */
+ if ((info->array.layout & ~0xff) != 0x100)
+ return "Cannot Grow RAID10 with far/offset layout";
+ /* number of devices must be multiple of number of copies */
+ if (info->array.raid_disks % (info->array.layout & 0xff))
+ return "RAID10 layout too complex for Grow operation";
+
+ if (info->new_level != 0)
+ return "RAID10 can only be changed to RAID0";
+ new_disks = (info->array.raid_disks
+ / (info->array.layout & 0xff));
+ if (info->delta_disks != UnSet) {
+ info->delta_disks = (new_disks
+ - info->array.raid_disks);
+ }
+ if (info->delta_disks != new_disks - info->array.raid_disks)
+ return "New number of raid-devices impossible for RAID10";
+ if (info->new_chunk &&
+ info->new_chunk != info->array.chunk_size)
+ return "Cannot change chunk-size with RAID10 Grow";
+
+ /* looks good */
+ re->level = 0;
+ re->parity = 0;
+ re->before.data_disks = new_disks;
+ re->before.layout = 0;
+ re->blocks = 0;
+ return NULL;
+
+ case 0:
+ /* RAID0 can be converted to RAID10, or to RAID456 */
+ if (info->new_level == 10) {
+ if (info->new_layout == UnSet && info->delta_disks == UnSet) {
+ /* Assume near=2 layout */
+ info->new_layout = 0x102;
+ info->delta_disks = info->array.raid_disks;
+ }
+ if (info->new_layout == UnSet) {
+ int copies = 1 + (info->delta_disks
+ / info->array.raid_disks);
+ if (info->array.raid_disks * (copies-1)
+ != info->delta_disks)
+ return "Impossible number of devices"
+ " for RAID0->RAID10";
+ info->new_layout = 0x100 + copies;
+ }
+ if (info->delta_disks == UnSet) {
+ int copies = info->new_layout & 0xff;
+ if (info->new_layout != 0x100 + copies)
+ return "New layout impossible"
+ " for RAID0->RAID10";;
+ info->delta_disks = (copies - 1) *
+ info->array.raid_disks;
+ }
+ if (info->new_chunk &&
+ info->new_chunk != info->array.chunk_size)
+ return "Cannot change chunk-size with RAID0->RAID10";
+ /* looks good */
+ re->level = 10;
+ re->parity = 0;
+ re->before.data_disks = (info->array.raid_disks +
+ info->delta_disks);
+ re->before.layout = info->new_layout;
+ re->blocks = 0;
+ return NULL;
+ }
+
+ /* RAID0 can also covert to RAID0/4/5/6 by first converting to
+ * a raid4 style layout of the final level.
+ */
+ switch (info->new_level) {
+ case 0:
+ case 4:
+ re->level = 4;
+ re->before.layout = 0;
+ break;
+ case 5:
+ re->level = 5;
+ re->before.layout = ALGORITHM_PARITY_N;
+ break;
+ case 6:
+ re->level = 6;
+ re->before.layout = ALGORITHM_PARITY_N;
+ break;
+ default:
+ return "Impossible level change requested";
+ }
+ re->before.data_disks = info->array.raid_disks;
+ /* determining 'after' layout happens outside this 'switch' */
+ break;
+
+ case 4:
+ info->array.layout = ALGORITHM_PARITY_N;
+ case 5:
+ switch (info->new_level) {
+ case 4:
+ re->level = info->array.level;
+ re->before.data_disks = info->array.raid_disks - 1;
+ re->before.layout = info->array.layout;
+ break;
+ case 5:
+ re->level = 5;
+ re->before.data_disks = info->array.raid_disks - 1;
+ re->before.layout = info->array.layout;
+ break;
+ case 6:
+ re->level = 6;
+ re->before.data_disks = info->array.raid_disks - 1;
+ switch (info->array.layout) {
+ case ALGORITHM_LEFT_ASYMMETRIC:
+ re->before.layout = ALGORITHM_LEFT_ASYMMETRIC_6;
+ break;
+ case ALGORITHM_RIGHT_ASYMMETRIC:
+ re->before.layout = ALGORITHM_RIGHT_ASYMMETRIC_6;
+ break;
+ case ALGORITHM_LEFT_SYMMETRIC:
+ re->before.layout = ALGORITHM_LEFT_SYMMETRIC_6;
+ break;
+ case ALGORITHM_RIGHT_SYMMETRIC:
+ re->before.layout = ALGORITHM_RIGHT_SYMMETRIC_6;
+ break;
+ case ALGORITHM_PARITY_0:
+ re->before.layout = ALGORITHM_PARITY_0_6;
+ break;
+ case ALGORITHM_PARITY_N:
+ re->before.layout = ALGORITHM_PARITY_N_6;
+ break;
+ default:
+ return "Cannot convert an array with this layout";
+ }
+ break;
+ case 1:
+ if (info->array.raid_disks != 2)
+ return "Can only convert a 2-device array to RAID1";
+ re->level = 1;
+ re->before.data_disks = 2;
+ re->before.layout = 0;
+ break;
+ default:
+ return "Impossible level change requested";
+ }
+ break;
+ case 6:
+ switch (info->new_level) {
+ case 4:
+ case 5:
+ case 6:
+ re->level = 6;
+ re->before.data_disks = info->array.raid_disks - 2;
+ re->before.layout = info->array.layout;
+ break;
+ default:
+ return "Impossible level change requested";
+ }
+ break;
+ }
+
+ /* If we reached here then it looks like a re-stripe is
+ * happening. We have determined the intermediate level
+ * and initial raid_disks/layout and stored these in 're'.
+ *
+ * We need to deduce the final layout that can be atomically
+ * converted to the end state.
+ */
+ switch (info->new_level) {
+ case 0:
+ /* We can only get to RAID0 from RAID4 or RAID5
+ * with appropriate layout and one extra device
+ */
+ if (re->level != 4 && re->level != 5)
+ return "Cannot covert to RAID0 from this level";
+ if (info->delta_disks == UnSet)
+ re->after.data_disks = re->before.data_disks;
+ else
+ re->after.data_disks =
+ info->array.raid_disks + info->delta_disks;
+ switch (re->level) {
+ case 4:
+ re->after.layout = 0 ; break;
+ case 5:
+ re->after.layout = ALGORITHM_PARITY_N; break;
+ }
+ break;
+
+ case 4:
+ /* We can only get to RAID4 from RAID5 */
+ if (re->level != 4 && re->level != 5)
+ return "Cannot convert to RAID4 from this level";
+ if (info->delta_disks == UnSet)
+ re->after.data_disks = re->before.data_disks;
+ else
+ re->after.data_disks =
+ re->before.data_disks + info->delta_disks;
+ switch (re->level) {
+ case 4:
+ re->after.layout = 0 ; break;
+ case 5:
+ re->after.layout = ALGORITHM_PARITY_N; break;
+ }
+ break;
+
+ case 5:
+ /* We get to RAID5 for RAID5 or RAID6 */
+ if (re->level != 5 && re->level != 6)
+ return "Cannot convert to RAID5 from this level";
+ if (info->delta_disks == UnSet)
+ re->after.data_disks = re->before.data_disks;
+ else if (re->level == 5)
+ re->after.data_disks =
+ re->before.data_disks + info->delta_disks;
+ else
+ re->after.data_disks =
+ info->array.raid_disks + info->delta_disks - 1;
+ switch (re->level) {
+ case 5:
+ if (info->new_layout == UnSet)
+ re->after.layout = re->before.layout;
+ else
+ re->after.layout = info->new_layout;
+ break;
+ case 6:
+ if (info->new_layout == UnSet) {
+ re->after.layout = re->before.layout;
+ break;
+ }
+ /* after.layout needs to be raid6 version of new_layout */
+ if (info->new_layout == ALGORITHM_PARITY_N)
+ re->after.layout = ALGORITHM_PARITY_N;
+ else {
+ char layout[40];
+ char *ls = map_num(r5layout, info->new_layout);
+ int l;
+ strcat(strcpy(layout, ls), "-6");
+ l = map_name(r6layout, layout);
+ if (l == UnSet)
+ return "Cannot find RAID6 layout"
+ " to convert to";
+ re->after.layout = l;
+ }
+ }
+ break;
+
+ case 6:
+ /* We must already be at level 6 */
+ if (re->level != 6)
+ return "Impossible level change";
+ if (info->delta_disks == UnSet)
+ re->after.data_disks = re->before.data_disks;
+ else
+ re->after.data_disks = (info->array.raid_disks +
+ info->delta_disks) - 2;
+ if (info->new_layout == UnSet)
+ re->after.layout = re->before.layout;
+ else
+ re->after.layout = info->new_layout;
+ break;
+ default:
+ return "Impossible level change requested";
+ }
+ switch (re->level) {
+ case 6: re->parity = 2; break;
+ case 4:
+ case 5: re->parity = 1; break;
+ default: re->parity = 0; break;
+ }
+ /* So we have a restripe operation, we need to calculate the number
+ * of blocks per reshape operation.
+ */
+ if (info->new_chunk == 0)
+ info->new_chunk = info->array.chunk_size;
+ if (re->after.data_disks == re->before.data_disks &&
+ re->after.layout == re->before.layout &&
+ info->new_chunk == info->array.chunk_size) {
+ /* Nothing to change */
+ re->blocks = 0;
+ return NULL;
+ }
+ if (re->after.data_disks == 1 && re->before.data_disks == 1) {
+ /* chunks can layout changes make no difference */
+ re->blocks = 0;
+ return NULL;
+ }
+
+ if (re->after.data_disks == re->before.data_disks &&
+ get_linux_version() < 2006032)
+ return "in-place reshape is not safe before 2.6.32 - sorry.";
+
+ if (re->after.data_disks < re->before.data_disks &&
+ get_linux_version() < 2006030)
+ return "reshape to fewer devices is not supported before 2.6.32 - sorry.";
+
+ re->blocks = compute_backup_blocks(
+ info->new_chunk, info->array.chunk_size,
+ re->after.data_disks,
+ re->before.data_disks);
+
+ re->new_size = info->component_size * re->after.data_disks;
+ return NULL;
+}
+
+static int reshape_array(char *container, int fd, char *devname,
+ struct supertype *st, struct mdinfo *info,
+ int force, char *backup_file, int quiet, int forked);
+static int reshape_container(char *container, int cfd, char *devname,
+ struct supertype *st,
+ struct mdinfo *info,
+ int force,
+ char *backup_file,
+ int quiet);
int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
long long size,
* reshape (e.g. raid6->raid5, raid5->raid0)
*
*/
- struct mdu_array_info_s array, orig;
- char *c;
+ struct mdu_array_info_s array;
int rv = 0;
struct supertype *st;
char *subarray = NULL;
- int nchunk, ochunk;
- int nlayout, olayout;
- int ndisks, odisks;
- unsigned int ndata, odata;
- int orig_level = UnSet;
- char alt_layout[40];
- int *fdlist;
- unsigned long long *offsets;
- int d;
- int nrdisks;
- int err;
int frozen;
- unsigned long blocks, stripes;
- unsigned long cache;
- unsigned long long array_size;
int changed = 0;
char *container = NULL;
+ char container_buf[20];
int cfd = -1;
- int done;
+ struct mdinfo info;
struct mdinfo *sra;
- struct mdinfo *sd;
if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
fprintf(stderr, Name ": %s is not an active md array - aborting\n",
if (subarray) {
container_dev = st->container_dev;
cfd = open_dev_excl(st->container_dev);
- } else if (size >= 0 || layout_str != NULL || chunksize != 0 ||
- level != UnSet) {
- fprintf(stderr,
- Name ": %s is a container, only 'raid-devices' can be changed\n",
- devname);
- return 1;
} else {
container_dev = st->devnum;
close(fd);
return 1;
}
- container = devnum2devname(st->devnum);
- if (!container) {
- fprintf(stderr, Name ": Could not determine container name\n");
- free(subarray);
- return 1;
- }
+ fmt_devname(container_buf, container_dev);
+ container = container_buf;
if (subarray)
rv = st->ss->load_container(st, cfd, NULL);
}
/* ========= check for Raid10 -> Raid0 conversion ===============
- * current implemenation assumes that following conditions must be met:
+ * current implementation assumes that following conditions must be met:
* - far_copies == 1
* - near_copies == 2
*/
- if (level == 0 && array.level == 10 &&
+ if (level == 0 && array.level == 10 && sra &&
array.layout == ((1 << 8) + 2) && !(array.raid_disks & 1)) {
int err;
err = remove_disks_on_raid10_to_raid0_takeover(st, sra, array.layout);
if (err) {
dprintf(Name": Array cannot be reshaped\n");
- if (container)
- free(container);
if (cfd > -1)
close(cfd);
- return 1;
- }
- }
-
- /* ======= set level =========== */
- if (level != UnSet && level != array.level) {
- /* Trying to change the level.
- * We might need to change layout first and schedule a
- * level change for later.
- * Level changes that can happen immediately are:
- * 0->4,5,6 1->5 4->5,6 5->1,6
- * Level changes that need a layout change first are:
- * 6->5,4,0 : need a -6 layout, or parity-last
- * 5->4,0 : need parity-last
- */
- if ((array.level == 6 || array.level == 5) &&
- (level == 5 || level == 4 || level == 0)) {
- /* Don't change level yet, but choose intermediate
- * layout
- */
- if (level == 5) {
- if (layout_str == NULL)
- switch (array.layout) {
- case ALGORITHM_LEFT_ASYMMETRIC:
- case ALGORITHM_LEFT_ASYMMETRIC_6:
- case ALGORITHM_ROTATING_N_RESTART:
- layout_str = "left-asymmetric-6";
- break;
- case ALGORITHM_LEFT_SYMMETRIC:
- case ALGORITHM_LEFT_SYMMETRIC_6:
- case ALGORITHM_ROTATING_N_CONTINUE:
- layout_str = "left-symmetric-6";
- break;
- case ALGORITHM_RIGHT_ASYMMETRIC:
- case ALGORITHM_RIGHT_ASYMMETRIC_6:
- case ALGORITHM_ROTATING_ZERO_RESTART:
- layout_str = "right-asymmetric-6";
- break;
- case ALGORITHM_RIGHT_SYMMETRIC:
- case ALGORITHM_RIGHT_SYMMETRIC_6:
- layout_str = "right-symmetric-6";
- break;
- case ALGORITHM_PARITY_0:
- case ALGORITHM_PARITY_0_6:
- layout_str = "parity-first-6";
- break;
- case ALGORITHM_PARITY_N:
- layout_str = "parity-last";
- break;
- default:
- fprintf(stderr, Name ": %s: cannot"
- "convert layout to RAID5 equivalent\n",
- devname);
- rv = 1;
- goto release;
- }
- else {
- int l = map_name(r5layout, layout_str);
- if (l == UnSet) {
- fprintf(stderr, Name ": %s: layout '%s' not recognised\n",
- devname, layout_str);
- rv = 1;
- goto release;
- }
- if (l != ALGORITHM_PARITY_N) {
- /* need the -6 version */
- char *ls = map_num(r5layout, l);
- strcat(strcpy(alt_layout, ls),
- "-6");
- layout_str = alt_layout;
- }
- }
- if (raid_disks)
- /* The final raid6->raid5 conversion
- * will reduce the number of disks,
- * so now we need to aim higher
- */
- raid_disks++;
- } else
- layout_str = "parity-last";
- } else {
- /* Level change is a simple takeover. In the external
- * case we don't check with the metadata handler until
- * we establish what the final layout will be. If the
- * level change is disallowed we will revert to
- * orig_level without disturbing the metadata, otherwise
- * we will send an update.
- */
- c = map_num(pers, level);
- if (c == NULL) {
- rv = 1;/* not possible */
- goto release;
- }
- if (!force) {
- /* Need to check there are enough spares */
- int spares_needed = 0;
- switch (array.level * 16 + level) {
- case 0x05:
- spares_needed = 1; break;
- case 0x06:
- spares_needed = 2; break;
- case 0x15:
- spares_needed = 1; break;
- case 0x16:
- spares_needed = 2; break;
- case 0x56:
- spares_needed = 1; break;
- }
- if (raid_disks > array.raid_disks)
- spares_needed += raid_disks-array.raid_disks;
- if (spares_needed > array.spare_disks) {
- fprintf(stderr,
- Name ": Need %d spare%s to avoid"
- " degraded array, and only have %d.\n"
- " Use --force to over-ride"
- " this check.\n",
- spares_needed,
- spares_needed == 1 ? "" : "s",
- array.spare_disks);
- rv = 1;
- goto release;
- }
- }
- err = sysfs_set_str(sra, NULL, "level", c);
- if (err) {
- err = errno;
- fprintf(stderr, Name ": %s: could not set level to %s\n",
- devname, c);
- if (err == EBUSY &&
- (array.state & (1<<MD_SB_BITMAP_PRESENT)))
- fprintf(stderr, " Bitmap must be removed before level can be changed\n");
- rv = 1;
- goto release;
- }
- orig = array;
- orig_level = orig.level;
- ioctl(fd, GET_ARRAY_INFO, &array);
- if (layout_str == NULL &&
- orig.level == 5 && level == 6 &&
- array.layout != orig.layout)
- layout_str = map_num(r5layout, orig.layout);
- if (!quiet)
- fprintf(stderr, Name " level of %s changed to %s\n",
- devname, c);
- changed = 1;
+ rv = 1;
+ goto release;
}
}
- /* ========= set shape (chunk_size / layout / ndisks) ============== */
- /* Check if layout change is a no-op */
- switch (array.level) {
- case 5:
- if (layout_str && array.layout == map_name(r5layout, layout_str))
- layout_str = NULL;
- break;
- case 6:
- if (layout_str == NULL &&
- ((chunksize && chunksize * 1024 != array.chunk_size) ||
- (raid_disks && raid_disks != array.raid_disks)) &&
- array.layout >= 16) {
+ info.array = array;
+ info.new_level = level;
+ info.new_chunk = chunksize * 1024;
+ if (raid_disks)
+ info.delta_disks = raid_disks - info.array.raid_disks;
+ else
+ info.delta_disks = UnSet;
+ if (layout_str == NULL) {
+ info.new_layout = UnSet;
+ if (info.array.level == 6 &&
+ (info.new_level == 6 || info.new_level == UnSet) &&
+ info.array.layout >= 16) {
fprintf(stderr, Name
- ": %s has a non-standard layout. If you wish to preserve this\n"
- " during the reshape, please specify --layout=preserve\n"
- " If you want to change it, specify a layout or use --layout=normalise\n",
+ ": %s has a non-standard layout. If you"
+ " wish to preserve this\n"
+ " during the reshape, please specify"
+ " --layout=preserve\n"
+ " If you want to change it, specify a"
+ " layout or use --layout=normalise\n",
devname);
rv = 1;
goto release;
}
- if (layout_str &&
- (strcmp(layout_str, "normalise") == 0 ||
- strcmp(layout_str, "normalize") == 0)) {
- char *hyphen;
- strcpy(alt_layout, map_num(r6layout, array.layout));
- hyphen = strrchr(alt_layout, '-');
- if (hyphen && strcmp(hyphen, "-6") == 0) {
- *hyphen = 0;
- layout_str = alt_layout;
+ } else if (strcmp(layout_str, "normalise") == 0 ||
+ strcmp(layout_str, "normalize") == 0) {
+ /* If we have a -6 RAID6 layout, remove the '-6'. */
+ info.new_layout = UnSet;
+ if (info.array.level == 6 && info.new_level == UnSet) {
+ char l[40], *h;
+ strcpy(l, map_num(r6layout, info.array.layout));
+ h = strrchr(l, '-');
+ if (h && strcmp(h, "-6") == 0) {
+ *h = 0;
+ info.new_layout = map_name(r6layout, l);
}
}
-
- if (layout_str && array.layout == map_name(r6layout, layout_str))
- layout_str = NULL;
- if (layout_str && strcmp(layout_str, "preserve") == 0)
- layout_str = NULL;
- break;
- }
- if (layout_str == NULL
- && (chunksize == 0 || chunksize*1024 == array.chunk_size)
- && (raid_disks == 0 || raid_disks == array.raid_disks)) {
- if (reshape_super(st, -1, level, UnSet, 0, 0, NULL, devname, !quiet)) {
+ } else if (strcmp(layout_str, "preserve") == 0) {
+ info.new_layout = UnSet;
+ } else {
+ int l = info.new_level;
+ if (l == UnSet)
+ l = info.array.level;
+ switch (l) {
+ case 5:
+ info.new_layout = map_name(r5layout, layout_str);
+ break;
+ case 6:
+ info.new_layout = map_name(r6layout, layout_str);
+ break;
+ case 10:
+ info.new_layout = parse_layout_10(layout_str);
+ break;
+ case LEVEL_FAULTY:
+ info.new_layout = parse_layout_faulty(layout_str);
+ break;
+ default:
+ fprintf(stderr, Name ": layout not meaningful"
+ " with this level\n");
rv = 1;
goto release;
}
- sync_metadata(st);
- rv = 0;
- if (level != UnSet && level != array.level) {
- /* Looks like this level change doesn't need
- * a reshape after all.
- */
- c = map_num(pers, level);
- if (c) {
- rv = sysfs_set_str(sra, NULL, "level", c);
- if (rv) {
- int err = errno;
- fprintf(stderr, Name ": %s: could not set level to %s\n",
- devname, c);
- if (err == EBUSY &&
- (array.state & (1<<MD_SB_BITMAP_PRESENT)))
- fprintf(stderr, " Bitmap must be removed before level can be changed\n");
- rv = 1;
- }
- }
- } else if (!changed && !quiet)
- fprintf(stderr, Name ": %s: no change requested\n",
- devname);
-
- if (st->ss->external && !mdmon_running(st->container_dev) &&
- level > 0) {
- start_mdmon(st->container_dev);
- ping_monitor(container);
- }
- goto release;
- }
-
- c = map_num(pers, array.level);
- if (c == NULL) c = "-unknown-";
- switch (array.level) {
- default: /* raid0, linear, multipath cannot be reconfigured */
- fprintf(stderr, Name ": %s array %s cannot be reshaped.\n",
- c, devname);
- /* TODO raid0 raiddisks can be reshaped via raid4 */
- rv = 1;
- break;
- case LEVEL_CONTAINER: {
- int count;
-
- /* double check that we are not changing anything but raid_disks */
- if (size >= 0 || layout_str != NULL || chunksize != 0 || level != UnSet) {
- fprintf(stderr,
- Name ": %s is a container, only 'raid-devices' can be changed\n",
- devname);
+ if (info.new_layout == UnSet) {
+ fprintf(stderr, Name ": layout %s not understood"
+ " for this level\n",
+ layout_str);
rv = 1;
goto release;
}
+ }
- if (reshape_super(st, -1, UnSet, UnSet, 0, raid_disks,
- backup_file, devname, !quiet)) {
- rv = 1;
- goto release;
- }
+ if (array.level == LEVEL_CONTAINER) {
+ /* This change is to be applied to every array in the
+ * container. This is only needed when the metadata imposes
+ * restraints of the various arrays in the container.
+ * Currently we only know that IMSM requires all arrays
+ * to have the same number of devices so changing the
+ * number of devices (On-Line Capacity Expansion) must be
+ * performed at the level of the container
+ */
+ rv = reshape_container(container, fd, devname, st, &info,
+ force, backup_file, quiet);
+ } else {
+ /* Impose these changes on a single array. First
+ * check that the metadata is OK with the change. */
- count = reshape_container_raid_disks(st, container, raid_disks);
- if (count < 0) {
- revert_container_raid_disks(st, fd, container);
+ if (reshape_super(st, info.component_size, info.new_level,
+ info.new_layout, info.new_chunk,
+ info.array.raid_disks + info.delta_disks,
+ backup_file, devname, quiet)) {
rv = 1;
goto release;
- } else if (count == 0) {
- if (!quiet)
- fprintf(stderr, Name
- ": no active subarrays to reshape\n");
- goto release;
}
-
sync_metadata(st);
- if (!mdmon_running(st->devnum)) {
- start_mdmon(st->devnum);
- ping_monitor(container);
- st->update_tail = &st->updates;
- }
-
- /* give mdmon a chance to allocate spares */
- ping_manager(container);
-
- /* manage_reshape takes care of releasing the array(s) */
- st->ss->manage_reshape(st, backup_file);
- frozen = 0;
- goto release;
+ rv = reshape_array(container, fd, devname, st, &info, force,
+ backup_file, quiet, 0);
}
- case LEVEL_FAULTY: /* only 'layout' change is permitted */
+release:
+ unfreeze(st, frozen);
+ return rv;
+}
- if (chunksize || raid_disks) {
- fprintf(stderr, Name ": %s: Cannot change chunksize or disks of a 'faulty' array\n",
- devname);
- rv = 1;
- break;
- }
- if (layout_str == NULL)
- break; /* nothing to do.... */
+static int reshape_array(char *container, int fd, char *devname,
+ struct supertype *st, struct mdinfo *info,
+ int force,
+ char *backup_file, int quiet, int forked)
+{
+ struct reshape reshape;
+ int spares_needed;
+ char *msg;
+ int orig_level = UnSet;
+ int disks, odisks;
- array.layout = parse_layout_faulty(layout_str);
- if (array.layout < 0) {
- fprintf(stderr, Name ": %s: layout %s not understood for 'faulty' array\n",
- devname, layout_str);
- rv = 1;
- break;
- }
- if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
- fprintf(stderr, Name ": Cannot set layout for %s: %s\n",
- devname, strerror(errno));
- rv = 1;
- } else if (!quiet)
- printf("layout for %s set to %d\n", devname, array.layout);
- break;
+ struct mdu_array_info_s array;
+ char *c;
+ int rv = 0;
- case 1: /* only raid_disks can each be changed. */
+ int *fdlist;
+ unsigned long long *offsets;
+ int d;
+ int nrdisks;
+ int err;
+ int frozen;
+ unsigned long blocks, stripes;
+ unsigned long cache;
+ unsigned long long array_size;
+ int done;
+ struct mdinfo *sra, *sd;
- if (chunksize || layout_str != NULL) {
- fprintf(stderr, Name ": %s: Cannot change chunk size or layout for a RAID1 array.\n",
- devname);
- rv = 1;
- break;
- }
- if (raid_disks > 0) {
- if (reshape_super(st, -1, UnSet, UnSet, 0, raid_disks,
- NULL, devname, !quiet)) {
- rv = 1;
- goto release;
- }
- sync_metadata(st);
- array.raid_disks = raid_disks;
- if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
- fprintf(stderr, Name ": Cannot set raid-devices for %s: %s\n",
- devname, strerror(errno));
- rv = 1;
- }
- }
- break;
+ msg = analyse_change(info, &reshape);
+ if (msg) {
+ fprintf(stderr, Name ": %s\n", msg);
+ return 1;
+ }
+ spares_needed = max(reshape.before.data_disks,
+ reshape.after.data_disks)
+ + reshape.parity - array.raid_disks;
- case 4:
- case 5:
- case 6:
+ if (!force && spares_needed < info->array.spare_disks) {
+ fprintf(stderr,
+ Name ": Need %d spare%s to avoid degraded array,"
+ " and only have %d.\n"
+ " Use --force to over-ride this check.\n",
+ spares_needed,
+ spares_needed == 1 ? "" : "s",
+ info->array.spare_disks);
+ return 1;
+ }
- /*
- * layout/chunksize/raid_disks can be changed
- * though the kernel may not support it all.
- */
- if (subarray) {
- fprintf(stderr, Name ": Cannot reshape subarrays yet\n");
- break;
- }
+ if (reshape.level != info->array.level) {
+ char *c = map_num(pers, reshape.level);
+ int err;
+ if (c == NULL)
+ return 1; /* This should not be possible */
- /*
- * There are three possibilities.
- * 1/ The array will shrink.
- * We need to ensure the reshape will pause before reaching
- * the 'critical section'. We also need to fork and wait for
- * that to happen. When it does we
- * suspend/backup/complete/unfreeze
- *
- * 2/ The array will not change size.
- * This requires that we keep a backup of a sliding window
- * so that we can restore data after a crash. So we need
- * to fork and monitor progress.
- *
- * 3/ The array will grow. This is relatively easy.
- * However the kernel's restripe routines will cheerfully
- * overwrite some early data before it is safe. So we
- * need to make a backup of the early parts of the array
- * and be ready to restore it if rebuild aborts very early.
- *
- * We backup data by writing it to one spare, or to a
- * file which was given on command line.
- *
- * [FOLLOWING IS OLD AND PARTLY WRONG]
- * So: we enumerate the devices in the array and
- * make sure we can open all of them.
- * Then we freeze the early part of the array and
- * backup to the various spares.
- * Then we request changes and start the reshape.
- * Monitor progress until it has passed the danger zone.
- * and finally invalidate the copied data and unfreeze the
- * start of the array.
- *
- * In each case, we first make sure that storage is available
- * for the required backup.
- * Then we:
- * - request the shape change.
- * - for to handle backup etc.
- */
- nchunk = ochunk = array.chunk_size;
- nlayout = olayout = array.layout;
- ndisks = odisks = array.raid_disks;
-
- if (chunksize) {
- nchunk = chunksize * 1024;
- if (size % chunksize) {
- fprintf(stderr, Name ": component size %lluK is not"
- " a multiple of chunksize %dK\n",
- size, chunksize);
- break;
- }
+ err = sysfs_set_str(info, NULL, "level", c);
+ if (err) {
+ err = errno;
+ fprintf(stderr, Name ": %s: could not set level to %s\n",
+ devname, c);
+ if (err == EBUSY &&
+ (info->array.state & (1<<MD_SB_BITMAP_PRESENT)))
+ fprintf(stderr, " Bitmap must be removed"
+ " before level can be changed\n");
+ return 1;
}
- if (layout_str != NULL)
- switch(array.level) {
- case 4: /* ignore layout */
- break;
- case 5:
- nlayout = map_name(r5layout, layout_str);
- if (nlayout == UnSet) {
- fprintf(stderr, Name ": layout %s not understood for raid5.\n",
- layout_str);
- rv = 1;
- goto release;
- }
- break;
+ if (!quiet)
+ fprintf(stderr, Name " level of %s changed to %s\n",
+ devname, c);
+ orig_level = info->array.level;
+ }
- case 6:
- nlayout = map_name(r6layout, layout_str);
- if (nlayout == UnSet) {
- fprintf(stderr, Name ": layout %s not understood for raid6.\n",
- layout_str);
- rv = 1;
- goto release;
+ if (reshape.level > 0 && st->ss->external &&
+ !mdmon_running(st->container_dev)) {
+ start_mdmon(st->container_dev);
+ ping_monitor(container);
+ }
+
+ /* ->reshape_super might have chosen some spares from the
+ * container that it wants to be part of the new array.
+ * We can collect them with ->container_content and give
+ * them to the kernel.
+ */
+ if (st->ss->reshape_super && st->ss->container_content) {
+ char *subarray = strchr(info->text_version+1, '/')+1;
+ struct mdinfo *info2 =
+ st->ss->container_content(st, subarray);
+ struct mdinfo *d;
+
+ if (info2)
+ for (d = info2->devs; d; d = d->next) {
+ if (d->disk.state == 0 &&
+ d->disk.raid_disk >= 0) {
+ /* This is a spare that wants to
+ * be part of the array.
+ */
+ add_disk(fd, st, info2, d);
}
- break;
}
- if (raid_disks) ndisks = raid_disks;
+ sysfs_free(info2);
+ }
- odata = odisks-1;
- ndata = ndisks-1;
- if (array.level == 6) {
- odata--; /* number of data disks */
- ndata--;
+ if (reshape.blocks == 0) {
+ /* No restriping needed, but we might need to impose
+ * some more changes: layout, raid_disks, chunk_size
+ */
+ if (info->new_layout != UnSet &&
+ info->new_layout != info->array.layout) {
+ info->array.layout = info->new_layout;
+ if (ioctl(fd, SET_ARRAY_INFO, &info->array) != 0) {
+ fprintf(stderr, Name ": failed to set new layout\n");
+ rv = 1;
+ } else if (!quiet)
+ printf("layout for %s set to %d\n",
+ devname, info->array.layout);
+ }
+ if (info->delta_disks != UnSet &&
+ info->delta_disks != 0) {
+ info->array.raid_disks += info->delta_disks;
+ if (ioctl(fd, SET_ARRAY_INFO, &info->array) != 0) {
+ fprintf(stderr, Name ": failed to set raid disks\n");
+ rv = 1;
+ } else if (!quiet)
+ printf("raid_disks for %s set to %d\n",
+ devname, info->array.raid_disks);
+ }
+ if (info->new_chunk != 0 &&
+ info->new_chunk != info->array.chunk_size) {
+ if (sysfs_set_num(info, NULL,
+ "chunk_size", info->new_chunk) != 0) {
+ fprintf(stderr, Name ": failed to set chunk size\n");
+ rv = 1;
+ } else if (!quiet)
+ printf("chunk size for %s set to %d\n",
+ devname, info->array.chunk_size);
}
- if (odata == ndata &&
- get_linux_version() < 2006032) {
- fprintf(stderr, Name ": in-place reshape is not safe before 2.6.32, sorry.\n");
- break;
- }
+ return rv;
+ }
- /* Check that we can hold all the data */
- get_dev_size(fd, NULL, &array_size);
- if (ndata * (unsigned long long)size < (array_size/1024)) {
- fprintf(stderr, Name ": this change will reduce the size of the array.\n"
- " use --grow --array-size first to truncate array.\n"
- " e.g. mdadm --grow %s --array-size %llu\n",
- devname, ndata * size);
- rv = 1;
- break;
- }
+ /*
+ * There are three possibilities.
+ * 1/ The array will shrink.
+ * We need to ensure the reshape will pause before reaching
+ * the 'critical section'. We also need to fork and wait for
+ * that to happen. When it does we
+ * suspend/backup/complete/unfreeze
+ *
+ * 2/ The array will not change size.
+ * This requires that we keep a backup of a sliding window
+ * so that we can restore data after a crash. So we need
+ * to fork and monitor progress.
+ * In future we will allow the data_offset to change, so
+ * a sliding backup becomes unnecessary.
+ *
+ * 3/ The array will grow. This is relatively easy.
+ * However the kernel's restripe routines will cheerfully
+ * overwrite some early data before it is safe. So we
+ * need to make a backup of the early parts of the array
+ * and be ready to restore it if rebuild aborts very early.
+ * For externally managed metadata, we still need a forked
+ * child to monitor the reshape and suspend IO over the region
+ * that is being reshaped.
+ *
+ * We backup data by writing it to one spare, or to a
+ * file which was given on command line.
+ *
+ * In each case, we first make sure that storage is available
+ * for the required backup.
+ * Then we:
+ * - request the shape change.
+ * - fork to handle backup etc.
+ */
- blocks = compute_backup_blocks(nchunk, ochunk, ndata, odata);
+ /* Check that we can hold all the data */
+ get_dev_size(fd, NULL, &array_size);
+ if (reshape.new_size < (array_size/512)) {
+ fprintf(stderr,
+ Name ": this change will reduce the size of the array.\n"
+ " use --grow --array-size first to truncate array.\n"
+ " e.g. mdadm --grow %s --array-size %llu\n",
+ devname, reshape.new_size/2);
+ rv = 1;
+ goto release;
+ }
- sysfs_free(sra);
- sra = sysfs_read(fd, 0,
- GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|
- GET_CACHE);
+ sra = sysfs_read(fd, 0,
+ GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|
+ GET_CACHE);
- if (!sra) {
- fprintf(stderr, Name ": %s: Cannot get array details from sysfs\n",
- devname);
- rv = 1;
- break;
- }
+ if (!sra) {
+ fprintf(stderr, Name ": %s: Cannot get array details from sysfs\n",
+ devname);
+ rv = 1;
+ goto release;
+ }
- if (ndata == odata) {
- /* Make 'blocks' bigger for better throughput, but
- * not so big that we reject it below.
- * Try for 16 megabytes
- */
- while (blocks * 32 < sra->component_size &&
- blocks < 16*1024*2)
- blocks *= 2;
- } else
- fprintf(stderr, Name ": Need to backup %luK of critical "
- "section..\n", blocks/2);
+ /* Decide how many blocks (sectors) for a reshape
+ * unit. The number we have so far is just a minimum
+ */
+ blocks = reshape.blocks;
+ if (reshape.before.data_disks ==
+ reshape.after.data_disks) {
+ /* Make 'blocks' bigger for better throughput, but
+ * not so big that we reject it below.
+ * Try for 16 megabytes
+ */
+ while (blocks * 32 < sra->component_size &&
+ blocks < 16*1024*2)
+ blocks *= 2;
+ } else
+ fprintf(stderr, Name ": Need to backup %luK of critical "
+ "section..\n", blocks/2);
+
+ if (blocks >= sra->component_size/2) {
+ fprintf(stderr, Name ": %s: Something wrong"
+ " - reshape aborted\n",
+ devname);
+ rv = 1;
+ goto release;
+ }
+
+ /* Now we need to open all these devices so we can read/write.
+ */
+ nrdisks = array.raid_disks + sra->array.spare_disks;
+ fdlist = malloc((1+nrdisks) * sizeof(int));
+ offsets = malloc((1+nrdisks) * sizeof(offsets[0]));
+ if (!fdlist || !offsets) {
+ fprintf(stderr, Name ": malloc failed: grow aborted\n");
+ rv = 1;
+ goto release;
+ }
- if (blocks >= sra->component_size/2) {
- fprintf(stderr, Name ": %s: Something wrong - reshape aborted\n",
+ d = reshape_prepare_fdlist(devname, sra, array.raid_disks,
+ nrdisks, blocks, backup_file,
+ fdlist, offsets);
+ if (d < 0) {
+ rv = 1;
+ goto release;
+ }
+ if (backup_file == NULL) {
+ if (reshape.after.data_disks <= reshape.before.data_disks) {
+ fprintf(stderr,
+ Name ": %s: Cannot grow - need backup-file\n",
devname);
rv = 1;
- break;
- }
- nrdisks = array.raid_disks + sra->array.spare_disks;
- /* Now we need to open all these devices so we can read/write.
- */
- fdlist = malloc((1+nrdisks) * sizeof(int));
- offsets = malloc((1+nrdisks) * sizeof(offsets[0]));
- if (!fdlist || !offsets) {
- fprintf(stderr, Name ": malloc failed: grow aborted\n");
+ goto release;
+ } else if (sra->array.spare_disks == 0) {
+ fprintf(stderr, Name ": %s: Cannot grow - need a spare or "
+ "backup-file to backup critical section\n",
+ devname);
rv = 1;
- break;
+ goto release;
}
-
- d = reshape_prepare_fdlist(devname, sra, array.raid_disks,
- nrdisks, blocks, backup_file,
- fdlist, offsets);
- if (d < 0) {
+ } else {
+ if (!reshape_open_backup_file(backup_file, fd, devname,
+ (signed)blocks,
+ fdlist+d, offsets+d)) {
rv = 1;
goto release;
}
- if (backup_file == NULL) {
- if (st->ss->external && !st->ss->manage_reshape) {
- fprintf(stderr, Name ": %s Grow operation not supported by %s metadata\n",
- devname, st->ss->name);
- rv = 1;
- break;
- }
- if (ndata <= odata) {
- fprintf(stderr, Name ": %s: Cannot grow - need backup-file\n",
- devname);
- rv = 1;
- break;
- } else if (sra->array.spare_disks == 0) {
- fprintf(stderr, Name ": %s: Cannot grow - need a spare or "
- "backup-file to backup critical section\n",
- devname);
- rv = 1;
- break;
- }
- if (d == array.raid_disks) {
- fprintf(stderr, Name ": %s: No spare device for backup\n",
- devname);
- rv = 1;
- break;
- }
- } else {
- if (!reshape_open_backup_file(backup_file, fd, devname,
- (signed)blocks,
- fdlist+d, offsets+d)) {
- rv = 1;
- break;
- }
- d++;
- }
+ d++;
+ }
+
+ /* lastly, check that the internal stripe cache is
+ * large enough, or it won't work.
+ * It must hold at least 4 stripes of the larger
+ * chunk size
+ */
+ cache = max(info->array.chunk_size, info->new_chunk);
+ cache *= 4; /* 4 stripes minimum */
+ cache /= 512; /* convert to sectors */
+ disks = min(reshape.before.data_disks, reshape.after.data_disks);
+ /* make sure there is room for 'blocks' with a bit to spare */
+ if (cache < 16 + blocks / disks)
+ cache = 16 + blocks / disks;
+ cache /= (4096/512); /* Covert from sectors to pages */
+
+ if (sra->cache_size < cache)
+ subarray_set_num(container, sra, "stripe_cache_size",
+ cache+1);
+
+ /* Right, everything seems fine. Let's kick things off.
+ * If only changing raid_disks, use ioctl, else use
+ * sysfs.
+ */
+ sync_metadata(st);
- /* check that the operation is supported by the metadata */
- if (reshape_super(st, -1, level, nlayout, nchunk, ndisks,
- backup_file, devname, !quiet)) {
+ if (info->array.chunk_size == info->new_chunk &&
+ reshape.before.layout == reshape.after.layout) {
+ array.raid_disks = reshape.after.data_disks + reshape.parity;
+ if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
+ int err = errno;
rv = 1;
- break;
- }
+ fprintf(stderr,
+ Name ": Cannot set device shape for %s: %s\n",
+ devname, strerror(errno));
- /* ->reshape_super might have chosen some spares from the
- * container that it wants to be part of the new array.
- * We can collect them with ->container_content and give
- * them to the kernel.
- */
- if (st->ss->reshape_super && st->ss->container_content) {
- struct mdinfo *info =
- st->ss->container_content(st, subarray);
- struct mdinfo *d;
-
- if (info)
- for (d = info->devs; d; d = d->next) {
- if (d->disk.state == 0 &&
- d->disk.raid_disk >= 0) {
- /* This is a spare that wants to
- * be part of the array.
- */
- add_disk(fd, st, info, d);
- }
- }
- sysfs_free(info);
- }
+ if (err == EBUSY &&
+ (array.state & (1<<MD_SB_BITMAP_PRESENT)))
+ fprintf(stderr,
+ " Bitmap must be removed before"
+ " shape can be changed\n");
- /* lastly, check that the internal stripe cache is
- * large enough, or it won't work.
- */
-
- cache = (nchunk < ochunk) ? ochunk : nchunk;
- cache = cache * 4 / 4096;
- if (cache < blocks / 8 / odata + 16)
- /* Make it big enough to hold 'blocks' */
- cache = blocks / 8 / odata + 16;
- if (sra->cache_size < cache)
- sysfs_set_num(sra, NULL, "stripe_cache_size",
- cache+1);
- /* Right, everything seems fine. Let's kick things off.
- * If only changing raid_disks, use ioctl, else use
- * sysfs.
+ goto release;
+ }
+ } else {
+ /* set them all just in case some old 'new_*' value
+ * persists from some earlier problem
*/
- sync_metadata(st);
- if (ochunk == nchunk && olayout == nlayout) {
- array.raid_disks = ndisks;
- if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
- int err = errno;
- rv = 1;
- fprintf(stderr, Name ": Cannot set device shape for %s: %s\n",
- devname, strerror(errno));
- if (ndisks < odisks &&
- get_linux_version() < 2006030)
- fprintf(stderr, Name ": linux 2.6.30 or later required\n");
- if (err == EBUSY &&
- (array.state & (1<<MD_SB_BITMAP_PRESENT)))
- fprintf(stderr, " Bitmap must be removed before shape can be changed\n");
+ int err = err; /* only used if rv==1, and always set if
+ * rv==1, so initialisation not needed,
+ * despite gcc warning
+ */
+ if (sysfs_set_num(sra, NULL, "chunk_size", info->new_chunk) < 0)
+ rv = 1, err = errno;
+ if (!rv && sysfs_set_num(sra, NULL, "layout",
+ reshape.after.layout) < 0)
+ rv = 1, err = errno;
+ if (!rv && subarray_set_num(container, sra, "raid_disks",
+ reshape.after.data_disks +
+ reshape.parity) < 0)
+ rv = 1, err = errno;
+ if (rv) {
+ fprintf(stderr, Name ": Cannot set device shape for %s\n",
+ devname);
- break;
- }
- } else {
- /* set them all just in case some old 'new_*' value
- * persists from some earlier problem
- */
- int err = err; /* only used if rv==1, and always set if
- * rv==1, so initialisation not needed,
- * despite gcc warning
- */
- if (sysfs_set_num(sra, NULL, "chunk_size", nchunk) < 0)
- rv = 1, err = errno;
- if (!rv && sysfs_set_num(sra, NULL, "layout", nlayout) < 0)
- rv = 1, err = errno;
- if (!rv && sysfs_set_num(sra, NULL, "raid_disks", ndisks) < 0)
- rv = 1, err = errno;
- if (rv) {
- fprintf(stderr, Name ": Cannot set device shape for %s\n",
- devname);
- if (get_linux_version() < 2006030)
- fprintf(stderr, Name ": linux 2.6.30 or later required\n");
- if (err == EBUSY &&
- (array.state & (1<<MD_SB_BITMAP_PRESENT)))
- fprintf(stderr, " Bitmap must be removed before shape can be changed\n");
- break;
- }
+ if (err == EBUSY &&
+ (array.state & (1<<MD_SB_BITMAP_PRESENT)))
+ fprintf(stderr,
+ " Bitmap must be removed before"
+ " shape can be changed\n");
+ goto release;
}
+ }
- if (ndisks == 2 && odisks == 2) {
- /* No reshape is needed in this trivial case */
- rv = 0;
- break;
- }
+ start_reshape(sra);
+ if (st->ss->external) {
+ /* metadata handler takes it from here */
+ ping_manager(container);
+ st->ss->manage_reshape(st, backup_file);
+ frozen = 0;
+ goto release;
+ }
- start_reshape(sra);
- if (st->ss->external) {
- /* metadata handler takes it from here */
- ping_manager(container);
- st->ss->manage_reshape(st, backup_file);
- frozen = 0;
+ /* set up the backup-super-block. This requires the
+ * uuid from the array.
+ */
+ /* Find a superblock */
+ for (sd = sra->devs; sd; sd = sd->next) {
+ char *dn;
+ int devfd;
+ int ok;
+ if (sd->disk.state & (1<<MD_DISK_FAULTY))
+ continue;
+ dn = map_dev(sd->disk.major, sd->disk.minor, 1);
+ devfd = dev_open(dn, O_RDONLY);
+ if (devfd < 0)
+ continue;
+ ok = st->ss->load_super(st, devfd, NULL);
+ close(devfd);
+ if (ok >= 0)
break;
- }
+ }
+ if (!sd) {
+ fprintf(stderr, Name ": %s: Cannot find a superblock\n",
+ devname);
+ rv = 1;
+ abort_reshape(sra);
+ goto release;
+ }
- /* set up the backup-super-block. This requires the
- * uuid from the array.
- */
- /* Find a superblock */
- for (sd = sra->devs; sd; sd = sd->next) {
- char *dn;
- int devfd;
- int ok;
- if (sd->disk.state & (1<<MD_DISK_FAULTY))
- continue;
- dn = map_dev(sd->disk.major, sd->disk.minor, 1);
- devfd = dev_open(dn, O_RDONLY);
- if (devfd < 0)
- continue;
- ok = st->ss->load_super(st, devfd, NULL);
- close(devfd);
- if (ok >= 0)
- break;
- }
- if (!sd) {
- fprintf(stderr, Name ": %s: Cannot find a superblock\n",
- devname);
- rv = 1;
+ memset(&bsb, 0, 512);
+ memcpy(bsb.magic, "md_backup_data-1", 16);
+ st->ss->uuid_from_super(st, (int*)&bsb.set_uuid);
+ bsb.mtime = __cpu_to_le64(time(0));
+ bsb.devstart2 = blocks;
+
+ stripes = reshape.blocks / (info->array.chunk_size/512) /
+ reshape.before.data_disks;
+
+ /* Now we just need to kick off the reshape and watch, while
+ * handling backups of the data...
+ * This is all done by a forked background process.
+ */
+ switch(forked ? 0 : fork()) {
+ case 0:
+ close(fd);
+ if (check_env("MDADM_GROW_VERIFY"))
+ fd = open(devname, O_RDONLY | O_DIRECT);
+ else
+ fd = -1;
+ mlockall(MCL_FUTURE);
+
+ odisks = reshape.before.data_disks + reshape.parity;
+
+ if (reshape.before.data_disks <
+ reshape.after.data_disks)
+ done = child_grow(fd, sra, stripes,
+ fdlist, offsets,
+ odisks,
+ info->array.chunk_size,
+ reshape.level,
+ reshape.before.layout,
+ reshape.before.data_disks,
+ d - odisks, fdlist+odisks, offsets+odisks);
+ else if (reshape.before.data_disks >
+ reshape.after.data_disks)
+ done = child_shrink(fd, sra, stripes,
+ fdlist, offsets,
+ odisks, info->array.chunk_size, reshape.level,
+ reshape.before.layout,
+ reshape.before.data_disks,
+ d - odisks, fdlist+odisks, offsets+odisks);
+ else
+ done = child_same_size(fd, sra, stripes,
+ fdlist, offsets,
+ 0,
+ odisks, info->array.chunk_size, reshape.level,
+ reshape.before.layout,
+ reshape.before.data_disks,
+ d - odisks, fdlist+odisks, offsets+odisks);
+ if (backup_file && done)
+ unlink(backup_file);
+ if (!done)
abort_reshape(sra);
- break;
- }
+ else if (info->new_level != info->array.level) {
+ /* We need to wait for the reshape to finish
+ * (which will have happened unless odata < ndata)
+ * and then set the level
+ */
- memset(&bsb, 0, 512);
- memcpy(bsb.magic, "md_backup_data-1", 16);
- st->ss->uuid_from_super(st, (int*)&bsb.set_uuid);
- bsb.mtime = __cpu_to_le64(time(0));
- bsb.devstart2 = blocks;
- stripes = blocks / (ochunk/512) / odata;
- /* Now we just need to kick off the reshape and watch, while
- * handling backups of the data...
- * This is all done by a forked background process.
- */
- switch(fork()) {
- case 0:
- close(fd);
- if (check_env("MDADM_GROW_VERIFY"))
- fd = open(devname, O_RDONLY | O_DIRECT);
- else
- fd = -1;
- mlockall(MCL_FUTURE);
-
- if (odata < ndata)
- done = child_grow(fd, sra, stripes,
- fdlist, offsets,
- odisks, ochunk, array.level, olayout, odata,
- d - odisks, fdlist+odisks, offsets+odisks);
- else if (odata > ndata)
- done = child_shrink(fd, sra, stripes,
- fdlist, offsets,
- odisks, ochunk, array.level, olayout, odata,
- d - odisks, fdlist+odisks, offsets+odisks);
- else
- done = child_same_size(fd, sra, stripes,
- fdlist, offsets,
- 0,
- odisks, ochunk, array.level, olayout, odata,
- d - odisks, fdlist+odisks, offsets+odisks);
- if (backup_file && done)
- unlink(backup_file);
- if (!done)
- abort_reshape(sra);
- else if (level != UnSet && level != array.level) {
- /* We need to wait for the reshape to finish
- * (which will have happened unless odata < ndata)
- * and then set the level
- */
-
- c = map_num(pers, level);
- if (c == NULL)
- exit(0);/* not possible */
-
- if (odata < ndata)
- wait_reshape(sra);
- err = sysfs_set_str(sra, NULL, "level", c);
- if (err)
- fprintf(stderr, Name ": %s: could not set level to %s\n",
- devname, c);
+ c = map_num(pers, info->new_level);
+ if (c == NULL) {
+ if (forked)
+ return 1;
+ exit(0);/* not possible */
}
- exit(0);
- case -1:
- fprintf(stderr, Name ": Cannot run child to monitor reshape: %s\n",
- strerror(errno));
- rv = 1;
- abort_reshape(sra);
- break;
- default:
- /* The child will take care of unfreezing the array */
- frozen = 0;
- break;
+
+ if (reshape.before.data_disks <
+ reshape.after.data_disks)
+ wait_reshape(sra);
+ err = sysfs_set_str(sra, NULL, "level", c);
+ if (err)
+ fprintf(stderr, Name ": %s: could not set level to %s\n",
+ devname, c);
}
+ if (forked)
+ return 0;
+ exit(0);
+ case -1:
+ fprintf(stderr, Name ": Cannot run child to monitor reshape: %s\n",
+ strerror(errno));
+ rv = 1;
+ abort_reshape(sra);
+ break;
+ default:
+ /* The child will take care of unfreezing the array */
+ frozen = 0;
break;
-
}
+
release:
if (rv && orig_level != UnSet && sra) {
c = map_num(pers, orig_level);
return rv;
}
+int reshape_container(char *container, int cfd, char *devname,
+ struct supertype *st,
+ struct mdinfo *info,
+ int force,
+ char *backup_file,
+ int quiet)
+{
+ struct mdinfo *cc;
+ if (reshape_super(st, info->component_size, info->new_level,
+ info->new_layout, info->new_chunk,
+ info->array.raid_disks + info->delta_disks,
+ backup_file, devname, quiet))
+ return 1;
+
+ sync_metadata(st);
+
+ cc = st->ss->container_content(st, NULL);
+
+ if (!cc)
+ return 1;
+
+ switch (fork()) {
+ case -1: /* error */
+ perror("Cannot fork to complete reshape\n");
+ return 1;
+ default: /* parent */
+ printf(Name ": multi-array reshape continues in background\n");
+ return 0;
+ case 0: /* child */
+ break;
+ }
+
+ /* For each member array, we need to perform the reshape */
+ for (; cc; cc = cc->next) {
+ int rv;
+ int fd;
+ struct mdstat_ent *mdstat;
+ char *subarray = strchr(cc->text_version+1, '/')+1;
+ char *adev;
+
+ if (!cc->reshape_active)
+ continue;
+
+ mdstat = mdstat_by_subdev(subarray, devname2devnum(container));
+
+ if (!mdstat)
+ continue;
+ fd = open_dev_excl(mdstat->devnum);
+ if (fd < 0)
+ break;
+ adev = map_dev(dev2major(mdstat->devnum),
+ dev2minor(mdstat->devnum),
+ 0);
+ if (!adev)
+ adev = cc->text_version;
+
+ rv = reshape_array(container, fd, adev, st, cc, force,
+ backup_file, quiet, 1);
+ close(fd);
+ if (rv)
+ break;
+ }
+ exit(0);
+}
+
/*
* We run a child process in the background which performs the following
* steps:
projects / thirdparty / mdadm.git / commitdiff
