return __cpu_to_le32(csum);
}
-static int child_grow(int afd, struct mdinfo *sra, unsigned long blocks,
- int *fds, unsigned long long *offsets,
- int disks, int chunk, int level, int layout, int data,
- int dests, int *destfd, unsigned long long *destoffsets);
-static int child_shrink(int afd, struct mdinfo *sra, unsigned long blocks,
- int *fds, unsigned long long *offsets,
- int disks, int chunk, int level, int layout, int data,
- int dests, int *destfd, unsigned long long *destoffsets);
-static int child_same_size(int afd, struct mdinfo *sra, unsigned long blocks,
- int *fds, unsigned long long *offsets,
- unsigned long long start,
- int disks, int chunk, int level, int layout, int data,
- int dests, int *destfd, unsigned long long *destoffsets);
-
static int check_idle(struct supertype *st)
{
/* Check that all member arrays for this container, or the
int force,
char *backup_file,
int quiet);
+static int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape,
+ unsigned long stripes,
+ int *fds, unsigned long long *offsets,
+ int dests, int *destfd, unsigned long long *destoffsets);
+
int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
long long size,
}
info.array = array;
+ sysfs_init(&info, fd, NoMdDev);
+ info.component_size = size*2;
info.new_level = level;
info.new_chunk = chunksize * 1024;
if (raid_disks)
}
sra = sysfs_read(fd, 0,
- GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|
+ GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE||GET_CHUNK|
GET_CACHE);
if (!sra) {
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);
+ done = child_monitor(fd, sra, &reshape, stripes,
+ fdlist, offsets,
+ d - odisks, fdlist+odisks, offsets+odisks);
+
if (backup_file && done)
unlink(backup_file);
if (!done)
if (!adev)
adev = cc->text_version;
+ sysfs_init(cc, fd, mdstat->devnum);
rv = reshape_array(container, fd, adev, st, cc, force,
backup_file, quiet, 1);
close(fd);
*
*/
+int progress_reshape(struct mdinfo *info, struct reshape *reshape,
+ unsigned long long backup_point,
+ unsigned long long wait_point,
+ unsigned long long *suspend_point,
+ unsigned long long *reshape_completed)
+{
+ /* This function is called repeatedly by the reshape manager.
+ * It determines how much progress can safely be made and allows
+ * that progress.
+ * - 'info' identifies the array and particularly records in
+ * ->reshape_progress the metadata's knowledge of progress
+ * This is a sector offset from the start of the array
+ * of the next array block to be relocated. This number
+ * may increase from 0 or decrease from array_size, depending
+ * on the type of reshape that is happening.
+ * Note that in contrast, 'sync_completed' is a block count of the
+ * reshape so far. It gives the distance between the start point
+ * (head or tail of device) and the next place that data will be
+ * written. It always increases.
+ * - 'reshape' is the structure created by analyse_change
+ * - 'backup_point' shows how much the metadata manager has backed-up
+ * data. For reshapes with increasing progress, it is the next address
+ * to be backed up, previous addresses have been backed-up. For
+ * decreasing progress, it is the earliest address that has been
+ * backed up - later address are also backed up.
+ * So addresses between reshape_progress and backup_point are
+ * backed up providing those are in the 'correct' order.
+ * - 'wait_point' is an array address. When reshape_completed
+ * passes this point, progress_reshape should return. It might
+ * return earlier if it determines that ->reshape_progress needs
+ * to be updated or further backup is needed.
+ * - suspend_point is maintained by progress_reshape and the caller
+ * should not touch it except to initialise to zero.
+ * It is an array address and it only increases in 2.6.37 and earlier.
+ * This makes it difficulty to handle reducing reshapes with
+ * external metadata.
+ * However: it is similar to backup_point in that it records the
+ * other end of a suspended region from reshape_progress.
+ * it is moved to extend the region that is safe to backup and/or
+ * reshape
+ * - reshape_completed is read from sysfs and returned. The caller
+ * should copy this into ->reshape_progress when it has reason to
+ * believe that the metadata knows this, and any backup outside this
+ * has been erased.
+ *
+ * Return value is:
+ * 1 if more data from backup_point - but only as far as suspend_point,
+ * should be backed up
+ * 0 if things are progressing smoothly
+ * -1 if the reshape is finished, either because it is all done,
+ * or due to an error.
+ */
+
+ int advancing = (reshape->after.data_disks
+ >= reshape->before.data_disks);
+ int need_backup = (reshape->after.data_disks
+ == reshape->before.data_disks);
+ unsigned long long read_offset, write_offset;
+ unsigned long long read_range, write_range;
+ unsigned long long max_progress, target, completed;
+ int fd;
+
+ /* First, we unsuspend any region that is now known to be safe.
+ * If suspend_point is on the 'wrong' side of reshape_progress, then
+ * we don't have or need suspension at the moment. This is true for
+ * native metadata when we don't need to back-up.
+ */
+ if (advancing) {
+ if (info->reshape_progress < *suspend_point)
+ sysfs_set_num(info, NULL, "suspend_lo",
+ info->reshape_progress);
+ } else {
+ /* Note: this won't work in 2.6.37 and before.
+ * Something somewhere should make sure we don't need it!
+ */
+ if (info->reshape_progress > *suspend_point)
+ sysfs_set_num(info, NULL, "suspend_hi",
+ info->reshape_progress);
+ }
+
+ /* Now work out how far it is safe to progress.
+ * If the read_offset for ->reshape_progress is less than
+ * 'blocks' beyond the write_offset, we can only progress as far
+ * as a backup.
+ * Otherwise we can progress until the write_offset for the new location
+ * reaches (within 'blocks' of) the read_offset at the current location.
+ * However that region must be suspended unless we are using native
+ * metadata.
+ * If we need to suspend more, we limit it to 128M per device, which is
+ * rather arbitrary and should be some time-based calculation.
+ */
+ write_offset = info->reshape_progress / reshape->before.data_disks;
+ read_offset = info->reshape_progress / reshape->after.data_disks;
+ write_range = reshape->blocks / reshape->before.data_disks;
+ read_range = reshape->blocks / reshape->after.data_disks;
+ if (advancing) {
+ if (read_offset < write_offset + write_range) {
+ max_progress = backup_point;
+ if (max_progress <= info->reshape_progress)
+ need_backup = 1;
+ } else {
+ max_progress =
+ (read_offset - write_range) *
+ reshape->before.data_disks;
+ }
+ } else {
+ if (read_offset > write_offset - write_range) {
+ max_progress = backup_point;
+ if (max_progress >= info->reshape_progress)
+ need_backup = 1;
+ } else {
+ max_progress =
+ (read_offset + write_range) *
+ reshape->before.data_disks;
+ /* If we are using internal metadata, then we can
+ * progress all the way to the suspend_point without
+ * worrying about backing-up/suspending along the
+ * way.
+ */
+ if (max_progress < *suspend_point &&
+ info->array.major_version >= 0)
+ max_progress = *suspend_point;
+ }
+ }
+
+ /* We know it is safe to progress to 'max_progress' providing
+ * it is suspended or we are using native metadata.
+ * Consider extending suspend_point 128M per device if it
+ * is less than 64M per device beyond reshape_progress.
+ * But always do a multiple of 'blocks'
+ */
+ target = 64*1024*2 * min(reshape->before.data_disks,
+ reshape->after.data_disks);
+ target /= reshape->blocks;
+ if (target < 2)
+ target = 2;
+ target *= reshape->blocks;
+
+ /* For externally managed metadata we always need to suspend IO to
+ * the area being reshaped so we regularly push suspend_point forward.
+ * For native metadata we only need the suspend if we are going to do
+ * a backup.
+ */
+ if (advancing) {
+ if ((need_backup || info->array.major_version < 0) &&
+ *suspend_point < info->reshape_progress + target) {
+ if (max_progress < *suspend_point + 2 * target)
+ *suspend_point = max_progress;
+ else
+ *suspend_point += 2 * target;
+ sysfs_set_num(info, NULL, "suspend_hi", *suspend_point);
+ max_progress = *suspend_point;
+ }
+ } else {
+ if ((need_backup || info->array.major_version < 0) &&
+ *suspend_point > info->reshape_progress - target) {
+ if (max_progress > *suspend_point - 2 * target)
+ *suspend_point = max_progress;
+ else
+ *suspend_point -= 2 * target;
+ sysfs_set_num(info, NULL, "suspend_lo", *suspend_point);
+ max_progress = *suspend_point;
+ }
+ }
+
+ /* now set sync_max to allow that progress. sync_max, like
+ * sync_completed is a count of sectors written per device, so
+ * we find the difference between max_progress and the start point,
+ * and divide that by after.data_disks to get a sync_max
+ * number.
+ * At the same time we convert wait_point to a similar number
+ * for comparing against sync_completed.
+ */
+ if (!advancing) {
+ max_progress = info->component_size * reshape->after.data_disks
+ - max_progress;
+ wait_point = info->component_size * reshape->after.data_disks
+ - wait_point;
+ }
+ max_progress /= reshape->after.data_disks;
+ wait_point /= reshape->after.data_disks;
+
+ sysfs_set_num(info, NULL, "sync_max", max_progress);
+
+ /* Now wait. If we have already reached the point that we were
+ * asked to wait to, don't wait at all, else wait for any change.
+ * We need to select on 'sync_completed' as that is the place that
+ * notifications happen, but we are really interested in
+ * 'reshape_position'
+ */
+ fd = sysfs_get_fd(info, NULL, "sync_completed");
+ if (fd < 0)
+ return -1;
+
+ if (sysfs_fd_get_ll(fd, &completed) < 0) {
+ close(fd);
+ return -1;
+ }
+ while (completed < max_progress && completed < wait_point) {
+ /* Check that sync_action is still 'reshape' to avoid
+ * waiting forever on a dead array
+ */
+ char action[20];
+ fd_set rfds;
+ if (sysfs_get_str(info, NULL, "sync_action",
+ action, 20) <= 0 ||
+ strncmp(action, "reshape", 7) != 0)
+ break;
+ FD_ZERO(&rfds);
+ FD_SET(fd, &rfds);
+ select(fd+1, NULL, NULL, &rfds, NULL);
+ if (sysfs_fd_get_ll(fd, &completed) < 0) {
+ close(fd);
+ return -1;
+ }
+ }
+ /* Convert 'completed' back in to a 'progress' number */
+ completed *= reshape->after.data_disks;
+ if (!advancing) {
+ completed = info->component_size * reshape->after.data_disks
+ - completed;
+ }
+ *reshape_completed = completed;
+
+ close(fd);
+
+ /* We return the need_backup flag. Caller will decide
+ * how much (a multiple of ->blocks) and will adjust
+ * suspend_{lo,hi} and suspend_point.
+ */
+ return need_backup;
+}
+
+
/* FIXME return status is never checked */
static int grow_backup(struct mdinfo *sra,
unsigned long long offset, /* per device */
- unsigned long stripes, /* per device */
+ unsigned long stripes, /* per device, in old chunks */
int *sources, unsigned long long *offsets,
int disks, int chunk, int level, int layout,
int dests, int *destfd, unsigned long long *destoffsets,
odata--;
if (level == 6)
odata--;
- sysfs_set_num(sra, NULL, "suspend_hi", (offset + stripes * (chunk/512)) * odata);
+
/* Check that array hasn't become degraded, else we might backup the wrong data */
sysfs_get_ll(sra, NULL, "degraded", &ll);
new_degraded = (int)ll;
* every works.
*/
/* FIXME return value is often ignored */
-static int wait_backup(struct mdinfo *sra,
- unsigned long long offset, /* per device */
- unsigned long long blocks, /* per device */
- unsigned long long blocks2, /* per device - hack */
+static int forget_backup(
int dests, int *destfd, unsigned long long *destoffsets,
int part)
{
- /* Wait for resync to pass the section that was backed up
- * then erase the backup and allow IO
+ /*
+ * Erase backup 'part' (which is 0 or 1)
*/
- int fd = sysfs_get_fd(sra, NULL, "sync_completed");
- unsigned long long completed;
int i;
int rv;
- if (fd < 0)
- return -1;
- sysfs_set_num(sra, NULL, "sync_max", offset + blocks + blocks2);
-
- if (sysfs_fd_get_ll(fd, &completed) < 0) {
- close(fd);
- return -1;
- }
- while (completed < offset + blocks) {
- char action[20];
- fd_set rfds;
- FD_ZERO(&rfds);
- FD_SET(fd, &rfds);
- select(fd+1, NULL, NULL, &rfds, NULL);
- if (sysfs_fd_get_ll(fd, &completed) < 0) {
- close(fd);
- return -1;
- }
- if (sysfs_get_str(sra, NULL, "sync_action",
- action, 20) > 0 &&
- strncmp(action, "reshape", 7) != 0)
- break;
- }
- close(fd);
-
if (part) {
bsb.arraystart2 = __cpu_to_le64(0);
bsb.length2 = __cpu_to_le64(0);
}
}
-static int child_grow(int afd, struct mdinfo *sra, unsigned long stripes,
- int *fds, unsigned long long *offsets,
- int disks, int chunk, int level, int layout, int data,
- int dests, int *destfd, unsigned long long *destoffsets)
+static int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape,
+ unsigned long stripes,
+ int *fds, unsigned long long *offsets,
+ int dests, int *destfd, unsigned long long *destoffsets)
{
+ /* Monitor a reshape where backup is being performed using
+ * 'native' mechanism - either to a backup file, or
+ * to some space in a spare.
+ */
char *buf;
- int degraded = 0;
+ int degraded = -1;
+ unsigned long long speed;
+ unsigned long long suspend_point, array_size;
+ unsigned long long backup_point, wait_point;
+ unsigned long long reshape_completed;
+ int done = 0;
+ int increasing = reshape->after.data_disks >= reshape->before.data_disks;
+ int part = 0; /* The next part of the backup area to fill. It may already
+ * be full, so we need to check */
+ int level = reshape->level;
+ int layout = reshape->before.layout;
+ int data = reshape->before.data_disks;
+ int disks = reshape->before.data_disks + reshape->parity;
+ int chunk = sra->array.chunk_size;
if (posix_memalign((void**)&buf, 4096, disks * chunk))
/* Don't start the 'reshape' */
return 0;
- grow_backup(sra, 0, stripes,
- fds, offsets, disks, chunk, level, layout,
- dests, destfd, destoffsets,
- 0, °raded, buf);
- validate(afd, destfd[0], destoffsets[0]);
- wait_backup(sra, 0, stripes * (chunk / 512), stripes * (chunk / 512),
- dests, destfd, destoffsets,
- 0);
- sysfs_set_num(sra, NULL, "suspend_lo", (stripes * (chunk/512)) * data);
- free(buf);
- /* FIXME this should probably be numeric */
- sysfs_set_str(sra, NULL, "sync_max", "max");
- return 1;
-}
+ if (reshape->before.data_disks == reshape->after.data_disks) {
+ sysfs_get_ll(sra, NULL, "sync_speed_min", &speed);
+ sysfs_set_num(sra, NULL, "sync_speed_min", 200000);
+ }
-static int child_shrink(int afd, struct mdinfo *sra, unsigned long stripes,
- int *fds, unsigned long long *offsets,
- int disks, int chunk, int level, int layout, int data,
- int dests, int *destfd, unsigned long long *destoffsets)
-{
- char *buf;
- unsigned long long start;
- int rv;
- int degraded = 0;
+ array_size = sra->component_size * data;
+ if (increasing) {
+ backup_point = sra->reshape_progress;
+ suspend_point = 0;
+ } else {
+ backup_point = array_size;
+ suspend_point = array_size;
+ }
- if (posix_memalign((void**)&buf, 4096, disks * chunk))
- return 0;
- start = sra->component_size - stripes * (chunk/512);
- sysfs_set_num(sra, NULL, "sync_max", start);
- rv = wait_backup(sra, 0, start - stripes * (chunk/512), stripes * (chunk/512),
- dests, destfd, destoffsets, 0);
- if (rv < 0)
- return 0;
- grow_backup(sra, 0, stripes,
- fds, offsets,
- disks, chunk, level, layout,
- dests, destfd, destoffsets,
- 0, °raded, buf);
- validate(afd, destfd[0], destoffsets[0]);
- wait_backup(sra, start, stripes*(chunk/512), 0,
- dests, destfd, destoffsets, 0);
- sysfs_set_num(sra, NULL, "suspend_lo", (stripes * (chunk/512)) * data);
- free(buf);
- /* FIXME this should probably be numeric */
- sysfs_set_str(sra, NULL, "sync_max", "max");
- return 1;
-}
+ while (!done) {
+ int rv;
-static int child_same_size(int afd, struct mdinfo *sra, unsigned long stripes,
- int *fds, unsigned long long *offsets,
- unsigned long long start,
- int disks, int chunk, int level, int layout, int data,
- int dests, int *destfd, unsigned long long *destoffsets)
-{
- unsigned long long size;
- unsigned long tailstripes = stripes;
- int part;
- char *buf;
- unsigned long long speed;
- int degraded = 0;
+ /* Want to return as soon the oldest backup slot can
+ * be released as that allows us to start backing up
+ * some more, providing suspend_point has been
+ * advanced, which it should have
+ */
+ if (increasing) {
+ wait_point = array_size;
+ if (part == 0 && __le64_to_cpu(bsb.length) > 0)
+ wait_point = (__le64_to_cpu(bsb.arraystart) +
+ __le64_to_cpu(bsb.length));
+ if (part == 1 && __le64_to_cpu(bsb.length2) > 0)
+ wait_point = (__le64_to_cpu(bsb.arraystart2) +
+ __le64_to_cpu(bsb.length2));
+ } else {
+ wait_point = 0;
+ if (part == 0 && __le64_to_cpu(bsb.length) > 0)
+ wait_point = __le64_to_cpu(bsb.arraystart);
+ if (part == 1 && __le64_to_cpu(bsb.length2) > 0)
+ wait_point = __le64_to_cpu(bsb.arraystart2);
+ }
+
+ rv = progress_reshape(sra, reshape,
+ backup_point, wait_point,
+ &suspend_point, &reshape_completed);
+ if (rv < 0) {
+ done = 1;
+ break;
+ }
+ /* external metadata would need to ping_monitor here */
+ sra->reshape_progress = reshape_completed;
- if (posix_memalign((void**)&buf, 4096, disks * chunk))
- return 0;
+ /* Clear any backup region that is before 'here' */
+ if (increasing) {
+ if (reshape_completed >= (__le64_to_cpu(bsb.arraystart) +
+ __le64_to_cpu(bsb.length)))
+ forget_backup(dests, destfd,
+ destoffsets, 0);
+ if (reshape_completed >= (__le64_to_cpu(bsb.arraystart2) +
+ __le64_to_cpu(bsb.length2)))
+ forget_backup(dests, destfd,
+ destoffsets, 1);
+ } else {
+ if (reshape_completed <= (__le64_to_cpu(bsb.arraystart)))
+ forget_backup(dests, destfd,
+ destoffsets, 0);
+ if (reshape_completed <= (__le64_to_cpu(bsb.arraystart2)))
+ forget_backup(dests, destfd,
+ destoffsets, 1);
+ }
- sysfs_get_ll(sra, NULL, "sync_speed_min", &speed);
- sysfs_set_num(sra, NULL, "sync_speed_min", 200000);
-
- grow_backup(sra, start, stripes,
- fds, offsets,
- disks, chunk, level, layout,
- dests, destfd, destoffsets,
- 0, °raded, buf);
- grow_backup(sra, (start + stripes) * (chunk/512), stripes,
- fds, offsets,
- disks, chunk, level, layout,
- dests, destfd, destoffsets,
- 1, °raded, buf);
- validate(afd, destfd[0], destoffsets[0]);
- part = 0;
- start += stripes * 2; /* where to read next */
- size = sra->component_size / (chunk/512);
- while (start < size) {
- if (wait_backup(sra, (start-stripes*2)*(chunk/512),
- stripes*(chunk/512), 0,
- dests, destfd, destoffsets,
- part) < 0)
- return 0;
- sysfs_set_num(sra, NULL, "suspend_lo", start*(chunk/512) * data);
- if (start + stripes > size)
- tailstripes = (size - start);
-
- grow_backup(sra, start*(chunk/512), tailstripes,
- fds, offsets,
- disks, chunk, level, layout,
- dests, destfd, destoffsets,
- part, °raded, buf);
- start += stripes;
- part = 1 - part;
- validate(afd, destfd[0], destoffsets[0]);
- }
- if (wait_backup(sra, (start-stripes*2) * (chunk/512), stripes * (chunk/512), 0,
- dests, destfd, destoffsets,
- part) < 0)
- return 0;
- sysfs_set_num(sra, NULL, "suspend_lo", ((start-stripes)*(chunk/512)) * data);
- wait_backup(sra, (start-stripes) * (chunk/512), tailstripes * (chunk/512), 0,
- dests, destfd, destoffsets,
- 1-part);
- sysfs_set_num(sra, NULL, "suspend_lo", (size*(chunk/512)) * data);
- sysfs_set_num(sra, NULL, "sync_speed_min", speed);
+ if (rv) {
+ unsigned long long offset;
+ /* need to backup some space... */
+ /* Check that 'part' is unused */
+ if (part == 0 && __le64_to_cpu(bsb.length) != 0)
+ abort(); /* BUG here */
+ if (part == 1 && __le64_to_cpu(bsb.length2) != 0)
+ abort();
+
+ offset = backup_point / data;
+ if (!increasing)
+ offset -= stripes * (chunk/512);
+ grow_backup(sra, offset, stripes,
+ fds, offsets,
+ disks, chunk, level, layout,
+ dests, destfd, destoffsets,
+ part, °raded, buf);
+ validate(afd, destfd[0], destoffsets[0]);
+ /* record where 'part' is up to */
+ part = !part;
+ if (increasing)
+ backup_point += stripes * (chunk/512) * data;
+ else
+ backup_point -= stripes * (chunk/512) * data;
+ }
+ }
+
+ if (reshape->before.data_disks == reshape->after.data_disks)
+ sysfs_set_num(sra, NULL, "sync_speed_min", speed);
free(buf);
- return 1;
+ return 1; /* FIXME what does this mean? */
}
/*
int Grow_continue(int mdfd, struct supertype *st, struct mdinfo *info,
char *backup_file)
{
- /* Array is assembled and ready to be started, but
- * monitoring is probably required.
- * So:
- * - start read-only
- * - set upper bound for resync
- * - initialise the 'suspend' boundaries
- * - switch to read-write
- * - fork and continue monitoring
- */
- int err;
- int backup_list[1];
- unsigned long long backup_offsets[1];
- int odisks, ndisks, ochunk, nchunk,odata,ndata;
- unsigned long a,b,blocks,stripes;
- int backup_fd;
- int *fds;
- unsigned long long *offsets;
- int d;
- struct mdinfo *sra, *sd;
- int rv;
- unsigned long cache;
- int done = 0;
-
- err = sysfs_set_str(info, NULL, "array_state", "readonly");
+ int err = sysfs_set_str(info, NULL, "array_state", "readonly");
if (err)
return err;
-
- /* make sure reshape doesn't progress until we are ready */
- sysfs_set_str(info, NULL, "sync_max", "0");
- sysfs_set_str(info, NULL, "array_state", "active"); /* FIXME or clean */
-
- sra = sysfs_read(-1, devname2devnum(info->sys_name),
- GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|
- GET_CACHE);
- if (!sra)
- return 1;
-
- /* ndisks is not growing, so raid_disks is old and +delta is new */
- odisks = info->array.raid_disks;
- ndisks = odisks + info->delta_disks;
- odata = odisks - 1;
- ndata = ndisks - 1;
- if (info->array.level == 6) {
- odata--;
- ndata--;
- }
- ochunk = info->array.chunk_size;
- nchunk = info->new_chunk;
-
- a = (ochunk/512) * odata;
- b = (nchunk/512) * ndata;
- /* Find GCD */
- while (a != b) {
- if (a < b)
- b -= a;
- if (b < a)
- a -= b;
- }
- /* LCM == product / GCD */
- blocks = (ochunk/512) * (nchunk/512) * odata * ndata / a;
-
- if (ndata == odata)
- while (blocks * 32 < sra->component_size &&
- blocks < 16*1024*2)
- blocks *= 2;
- stripes = blocks / (info->array.chunk_size/512) / odata;
-
- /* 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 / odisks + 16)
- /* Make it big enough to hold 'blocks' */
- cache = blocks / 8 / odisks + 16;
- if (sra->cache_size < cache)
- sysfs_set_num(sra, NULL, "stripe_cache_size",
- cache+1);
-
- memset(&bsb, 0, 512);
- memcpy(bsb.magic, "md_backup_data-1", 16);
- memcpy(&bsb.set_uuid, info->uuid, 16);
- bsb.mtime = __cpu_to_le64(time(0));
- bsb.devstart2 = blocks;
-
- backup_fd = open(backup_file, O_RDWR|O_CREAT, S_IRUSR | S_IWUSR);
- if (backup_fd < 0) {
- fprintf(stderr, Name ": Cannot open backup file %s\n",
- backup_file ?: "- no backup-file given");
- return 1;
- }
- backup_list[0] = backup_fd;
- backup_offsets[0] = 8 * 512;
- fds = malloc(odisks * sizeof(fds[0]));
- offsets = malloc(odisks * sizeof(offsets[0]));
- for (d=0; d<odisks; d++)
- fds[d] = -1;
-
- for (sd = sra->devs; sd; sd = sd->next) {
- if (sd->disk.state & (1<<MD_DISK_FAULTY))
- continue;
- if (sd->disk.state & (1<<MD_DISK_SYNC)) {
- char *dn = map_dev(sd->disk.major,
- sd->disk.minor, 1);
- fds[sd->disk.raid_disk]
- = dev_open(dn, O_RDONLY);
- offsets[sd->disk.raid_disk] = sd->data_offset*512;
- if (fds[sd->disk.raid_disk] < 0) {
- fprintf(stderr, Name ": %s: cannot open component %s\n",
- info->sys_name, dn?dn:"-unknown-");
- rv = 1;
- goto release;
- }
- free(dn);
- }
- }
-
- switch(fork()) {
- case 0:
- close(mdfd);
- mlockall(MCL_FUTURE);
- if (info->delta_disks < 0)
- done = child_shrink(-1, info, stripes,
- fds, offsets,
- info->array.raid_disks,
- info->array.chunk_size,
- info->array.level, info->array.layout,
- odata,
- 1, backup_list, backup_offsets);
- else if (info->delta_disks == 0) {
- /* The 'start' is a per-device stripe number.
- * reshape_progress is a per-array sector number.
- * So divide by ndata * chunk_size
- */
- unsigned long long start = info->reshape_progress / ndata;
- start /= (info->array.chunk_size/512);
- done = child_same_size(-1, info, stripes,
- fds, offsets,
- start,
- info->array.raid_disks,
- info->array.chunk_size,
- info->array.level, info->array.layout,
- odata,
- 1, backup_list, backup_offsets);
- }
- if (backup_file && done)
- unlink(backup_file);
- /* FIXME should I intuit a level change */
- exit(0);
- case -1:
- fprintf(stderr, Name ": Cannot run child to continue monitoring reshape: %s\n",
- strerror(errno));
- return 1;
- default:
- break;
- }
-release:
- return 0;
+ return reshape_array(NULL, mdfd, "array", st, info, 1, backup_file, 0, 0);
}
projects / thirdparty / mdadm.git / commitdiff
