]> git.ipfire.org Git - thirdparty/mdadm.git/blobdiff - Grow.c
Create: support --readonly flag.
[thirdparty/mdadm.git] / Grow.c
diff --git a/Grow.c b/Grow.c
index c1bc1cac9c6dc3a5251a41d64a5c95a4ba6bf6c2..8aa0a1392241a6afd052d3cd42a7d3b4108422dd 100644 (file)
--- a/Grow.c
+++ b/Grow.c
@@ -49,12 +49,8 @@ int restore_backup(struct supertype *st,
        int disk_count = next_spare + working_disks;
 
        dprintf("Called restore_backup()\n");
-       fdlist = malloc(sizeof(int) * disk_count);
-       if (fdlist == NULL) {
-               fprintf(stderr,
-                       Name ": cannot allocate memory for disk list\n");
-               return 1;
-       }
+       fdlist = xmalloc(sizeof(int) * disk_count);
+
        for (i = 0; i < next_spare; i++)
                fdlist[i] = -1;
        for (dev = content->devs; dev; dev = dev->next) {
@@ -84,10 +80,10 @@ int restore_backup(struct supertype *st,
        }
        free(fdlist);
        if (err) {
-               fprintf(stderr, Name ": Failed to restore critical"
-                       " section for reshape - sorry.\n");
+               pr_err("Failed to restore critical"
+                      " section for reshape - sorry.\n");
                if (!backup_file)
-                       fprintf(stderr, Name ":  Possibly you need"
+                       pr_err("Possibly you need"
                                " to specify a --backup-file\n");
                return 1;
        }
@@ -115,23 +111,23 @@ int Grow_Add_device(char *devname, int fd, char *newdev)
        char *subarray = NULL;
 
        if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
-               fprintf(stderr, Name ": cannot get array info for %s\n", devname);
+               pr_err("cannot get array info for %s\n", devname);
                return 1;
        }
 
        if (info.array.level != -1) {
-               fprintf(stderr, Name ": can only add devices to linear arrays\n");
+               pr_err("can only add devices to linear arrays\n");
                return 1;
        }
 
        st = super_by_fd(fd, &subarray);
        if (!st) {
-               fprintf(stderr, Name ": cannot handle arrays with superblock version %d\n", info.array.major_version);
+               pr_err("cannot handle arrays with superblock version %d\n", info.array.major_version);
                return 1;
        }
 
        if (subarray) {
-               fprintf(stderr, Name ": Cannot grow linear sub-arrays yet\n");
+               pr_err("Cannot grow linear sub-arrays yet\n");
                free(subarray);
                free(st);
                return 1;
@@ -139,13 +135,13 @@ int Grow_Add_device(char *devname, int fd, char *newdev)
 
        nfd = open(newdev, O_RDWR|O_EXCL|O_DIRECT);
        if (nfd < 0) {
-               fprintf(stderr, Name ": cannot open %s\n", newdev);
+               pr_err("cannot open %s\n", newdev);
                free(st);
                return 1;
        }
        fstat(nfd, &stb);
        if ((stb.st_mode & S_IFMT) != S_IFBLK) {
-               fprintf(stderr, Name ": %s is not a block device!\n", newdev);
+               pr_err("%s is not a block device!\n", newdev);
                close(nfd);
                free(st);
                return 1;
@@ -159,7 +155,7 @@ int Grow_Add_device(char *devname, int fd, char *newdev)
 
                disk.number = d;
                if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
-                       fprintf(stderr, Name ": cannot get device detail for device %d\n",
+                       pr_err("cannot get device detail for device %d\n",
                                d);
                        close(nfd);
                        free(st);
@@ -167,7 +163,7 @@ int Grow_Add_device(char *devname, int fd, char *newdev)
                }
                dv = map_dev(disk.major, disk.minor, 1);
                if (!dv) {
-                       fprintf(stderr, Name ": cannot find device file for device %d\n",
+                       pr_err("cannot find device file for device %d\n",
                                d);
                        close(nfd);
                        free(st);
@@ -175,14 +171,14 @@ int Grow_Add_device(char *devname, int fd, char *newdev)
                }
                fd2 = dev_open(dv, O_RDWR);
                if (fd2 < 0) {
-                       fprintf(stderr, Name ": cannot open device file %s\n", dv);
+                       pr_err("cannot open device file %s\n", dv);
                        close(nfd);
                        free(st);
                        return 1;
                }
 
                if (st->ss->load_super(st, fd2, NULL)) {
-                       fprintf(stderr, Name ": cannot find super block on %s\n", dv);
+                       pr_err("cannot find super block on %s\n", dv);
                        close(nfd);
                        close(fd2);
                        free(st);
@@ -203,7 +199,7 @@ int Grow_Add_device(char *devname, int fd, char *newdev)
                             0, 0, NULL);
 
        if (st->ss->store_super(st, nfd)) {
-               fprintf(stderr, Name ": Cannot store new superblock on %s\n",
+               pr_err("Cannot store new superblock on %s\n",
                        newdev);
                close(nfd);
                return 1;
@@ -211,7 +207,7 @@ int Grow_Add_device(char *devname, int fd, char *newdev)
        close(nfd);
 
        if (ioctl(fd, ADD_NEW_DISK, &info.disk) != 0) {
-               fprintf(stderr, Name ": Cannot add new disk to this array\n");
+               pr_err("Cannot add new disk to this array\n");
                return 1;
        }
        /* Well, that seems to have worked.
@@ -219,7 +215,7 @@ int Grow_Add_device(char *devname, int fd, char *newdev)
         */
 
        if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
-               fprintf(stderr, Name ": cannot get array info for %s\n", devname);
+               pr_err("cannot get array info for %s\n", devname);
                return 1;
        }
 
@@ -230,23 +226,23 @@ int Grow_Add_device(char *devname, int fd, char *newdev)
 
                disk.number = d;
                if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
-                       fprintf(stderr, Name ": cannot get device detail for device %d\n",
+                       pr_err("cannot get device detail for device %d\n",
                                d);
                        return 1;
                }
                dv = map_dev(disk.major, disk.minor, 1);
                if (!dv) {
-                       fprintf(stderr, Name ": cannot find device file for device %d\n",
+                       pr_err("cannot find device file for device %d\n",
                                d);
                        return 1;
                }
                fd2 = dev_open(dv, O_RDWR);
                if (fd2 < 0) {
-                       fprintf(stderr, Name ": cannot open device file %s\n", dv);
+                       pr_err("cannot open device file %s\n", dv);
                        return 1;
                }
                if (st->ss->load_super(st, fd2, NULL)) {
-                       fprintf(stderr, Name ": cannot find super block on %s\n", dv);
+                       pr_err("cannot find super block on %s\n", dv);
                        close(fd);
                        return 1;
                }
@@ -259,7 +255,7 @@ int Grow_Add_device(char *devname, int fd, char *newdev)
                                     0, 0, NULL);
 
                if (st->ss->store_super(st, fd2)) {
-                       fprintf(stderr, Name ": Cannot store new superblock on %s\n", dv);
+                       pr_err("Cannot store new superblock on %s\n", dv);
                        close(fd2);
                        return 1;
                }
@@ -290,7 +286,7 @@ int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int
 
        if (vers < 9003) {
                major = BITMAP_MAJOR_HOSTENDIAN;
-               fprintf(stderr, Name ": Warning - bitmaps created on this kernel"
+               pr_err("Warning - bitmaps created on this kernel"
                        " are not portable\n"
                        "  between different architectures.  Consider upgrading"
                        " the Linux kernel.\n");
@@ -298,48 +294,48 @@ int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int
 
        if (ioctl(fd, GET_BITMAP_FILE, &bmf) != 0) {
                if (errno == ENOMEM)
-                       fprintf(stderr, Name ": Memory allocation failure.\n");
+                       pr_err("Memory allocation failure.\n");
                else
-                       fprintf(stderr, Name ": bitmaps not supported by this kernel.\n");
+                       pr_err("bitmaps not supported by this kernel.\n");
                return 1;
        }
        if (bmf.pathname[0]) {
                if (strcmp(file,"none")==0) {
                        if (ioctl(fd, SET_BITMAP_FILE, -1)!= 0) {
-                               fprintf(stderr, Name ": failed to remove bitmap %s\n",
+                               pr_err("failed to remove bitmap %s\n",
                                        bmf.pathname);
                                return 1;
                        }
                        return 0;
                }
-               fprintf(stderr, Name ": %s already has a bitmap (%s)\n",
+               pr_err("%s already has a bitmap (%s)\n",
                        devname, bmf.pathname);
                return 1;
        }
        if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
-               fprintf(stderr, Name ": cannot get array status for %s\n", devname);
+               pr_err("cannot get array status for %s\n", devname);
                return 1;
        }
        if (array.state & (1<<MD_SB_BITMAP_PRESENT)) {
                if (strcmp(file, "none")==0) {
                        array.state &= ~(1<<MD_SB_BITMAP_PRESENT);
                        if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) {
-                               fprintf(stderr, Name ": failed to remove internal bitmap.\n");
+                               pr_err("failed to remove internal bitmap.\n");
                                return 1;
                        }
                        return 0;
                }
-               fprintf(stderr, Name ": Internal bitmap already present on %s\n",
+               pr_err("Internal bitmap already present on %s\n",
                        devname);
                return 1;
        }
 
        if (strcmp(file, "none") == 0) {
-               fprintf(stderr, Name ": no bitmap found on %s\n", devname);
+               pr_err("no bitmap found on %s\n", devname);
                return 1;
        }
        if (array.level <= 0) {
-               fprintf(stderr, Name ": Bitmaps not meaningful with level %s\n",
+               pr_err("Bitmaps not meaningful with level %s\n",
                        map_num(pers, array.level)?:"of this array");
                return 1;
        }
@@ -353,7 +349,7 @@ int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int
                bitmapsize = get_component_size(fd);
        }
        if (bitmapsize == 0) {
-               fprintf(stderr, Name ": Cannot reliably determine size of array to create bitmap - sorry.\n");
+               pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
                return 1;
        }
 
@@ -364,12 +360,12 @@ int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int
 
        st = super_by_fd(fd, &subarray);
        if (!st) {
-               fprintf(stderr, Name ": Cannot understand version %d.%d\n",
+               pr_err("Cannot understand version %d.%d\n",
                        array.major_version, array.minor_version);
                return 1;
        }
        if (subarray) {
-               fprintf(stderr, Name ": Cannot add bitmaps to sub-arrays yet\n");
+               pr_err("Cannot add bitmaps to sub-arrays yet\n");
                free(subarray);
                free(st);
                return 1;
@@ -380,7 +376,7 @@ int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int
                int offset_setable = 0;
                struct mdinfo *mdi;
                if (st->ss->add_internal_bitmap == NULL) {
-                       fprintf(stderr, Name ": Internal bitmaps not supported "
+                       pr_err("Internal bitmaps not supported "
                                "with %s metadata\n", st->ss->name);
                        return 1;
                }
@@ -412,8 +408,8 @@ int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int
                                                )
                                                st->ss->write_bitmap(st, fd2);
                                        else {
-                                               fprintf(stderr, Name ": failed "
-                               "to create internal bitmap - chunksize problem.\n");
+                                               pr_err("failed "
+                                                      "to create internal bitmap - chunksize problem.\n");
                                                close(fd2);
                                                return 1;
                                        }
@@ -424,18 +420,17 @@ int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int
                if (offset_setable) {
                        st->ss->getinfo_super(st, mdi, NULL);
                        sysfs_init(mdi, fd, -1);
-                       rv = sysfs_set_num(mdi, NULL, "bitmap/location",
-                                          mdi->bitmap_offset);
+                       rv = sysfs_set_num_signed(mdi, NULL, "bitmap/location",
+                                                 mdi->bitmap_offset);
                } else {
                        array.state |= (1<<MD_SB_BITMAP_PRESENT);
                        rv = ioctl(fd, SET_ARRAY_INFO, &array);
                }
                if (rv < 0) {
                        if (errno == EBUSY)
-                               fprintf(stderr, Name
-                                       ": Cannot add bitmap while array is"
-                                       " resyncing or reshaping etc.\n");
-                       fprintf(stderr, Name ": failed to set internal bitmap.\n");
+                               pr_err("Cannot add bitmap while array is"
+                                      " resyncing or reshaping etc.\n");
+                       pr_err("failed to set internal bitmap.\n");
                        return 1;
                }
        } else {
@@ -468,7 +463,7 @@ int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int
                        }
                }
                if (d == max_devs) {
-                       fprintf(stderr, Name ": cannot find UUID for array!\n");
+                       pr_err("cannot find UUID for array!\n");
                        return 1;
                }
                if (CreateBitmap(file, force, (char*)uuid, chunk,
@@ -477,17 +472,16 @@ int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int
                }
                bitmap_fd = open(file, O_RDWR);
                if (bitmap_fd < 0) {
-                       fprintf(stderr, Name ": weird: %s cannot be opened\n",
+                       pr_err("weird: %s cannot be opened\n",
                                file);
                        return 1;
                }
                if (ioctl(fd, SET_BITMAP_FILE, bitmap_fd) < 0) {
                        int err = errno;
                        if (errno == EBUSY)
-                               fprintf(stderr, Name
-                                       ": Cannot add bitmap while array is"
-                                       " resyncing or reshaping etc.\n");
-                       fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
+                               pr_err("Cannot add bitmap while array is"
+                                      " resyncing or reshaping etc.\n");
+                       pr_err("Cannot set bitmap file for %s: %s\n",
                                devname, strerror(err));
                        return 1;
                }
@@ -568,7 +562,7 @@ static int freeze_container(struct supertype *st)
        fmt_devname(container, container_dev);
 
        if (block_monitor(container, 1)) {
-               fprintf(stderr, Name ": failed to freeze container\n");
+               pr_err("failed to freeze container\n");
                return -2;
        }
 
@@ -623,8 +617,6 @@ static void unfreeze(struct supertype *st)
 
                if (sra)
                        sysfs_set_str(sra, NULL, "sync_action", "idle");
-               else
-                       fprintf(stderr, Name ": failed to unfreeze array\n");
                sysfs_free(sra);
        }
 }
@@ -650,21 +642,21 @@ static void wait_reshape(struct mdinfo *sra)
 static int reshape_super(struct supertype *st, long long size, int level,
                         int layout, int chunksize, int raid_disks,
                         int delta_disks, char *backup_file, char *dev,
-                        int verbose)
+                        int direction, int verbose)
 {
        /* nothing extra to check in the native case */
        if (!st->ss->external)
                return 0;
        if (!st->ss->reshape_super ||
            !st->ss->manage_reshape) {
-               fprintf(stderr, Name ": %s metadata does not support reshape\n",
+               pr_err("%s metadata does not support reshape\n",
                        st->ss->name);
                return 1;
        }
 
        return st->ss->reshape_super(st, size, level, layout, chunksize,
                                     raid_disks, delta_disks, backup_file, dev,
-                                    verbose);
+                                    direction, verbose);
 }
 
 static void sync_metadata(struct supertype *st)
@@ -863,9 +855,8 @@ int reshape_prepare_fdlist(char *devname,
                                = dev_open(dn, O_RDONLY);
                        offsets[sd->disk.raid_disk] = sd->data_offset*512;
                        if (fdlist[sd->disk.raid_disk] < 0) {
-                               fprintf(stderr,
-                                       Name ": %s: cannot open component %s\n",
-                                       devname, dn ? dn : "-unknown-");
+                               pr_err("%s: cannot open component %s\n",
+                                      devname, dn ? dn : "-unknown-");
                                d = -1;
                                goto release;
                        }
@@ -876,7 +867,7 @@ int reshape_prepare_fdlist(char *devname,
                                fdlist[d] = dev_open(dn, O_RDWR);
                                offsets[d] = (sd->data_offset + sra->component_size - blocks - 8)*512;
                                if (fdlist[d] < 0) {
-                                       fprintf(stderr, Name ": %s: cannot open component %s\n",
+                                       pr_err("%s: cannot open component %s\n",
                                                devname, dn ? dn : "-unknown-");
                                        d = -1;
                                        goto release;
@@ -907,7 +898,7 @@ int reshape_open_backup_file(char *backup_file,
                       S_IRUSR | S_IWUSR);
        *offsets = 8 * 512;
        if (*fdlist < 0) {
-               fprintf(stderr, Name ": %s: cannot create backup file %s: %s\n",
+               pr_err("%s: cannot create backup file %s: %s\n",
                        devname, backup_file, strerror(errno));
                return 0;
        }
@@ -920,7 +911,7 @@ int reshape_open_backup_file(char *backup_file,
        dev = stb.st_dev;
        fstat(fd, &stb);
        if (stb.st_rdev == dev) {
-               fprintf(stderr, Name ": backup file must NOT be"
+               pr_err("backup file must NOT be"
                        " on the array being reshaped.\n");
                close(*fdlist);
                return 0;
@@ -929,14 +920,14 @@ int reshape_open_backup_file(char *backup_file,
        memset(buf, 0, 512);
        for (i=0; i < blocks + 8 ; i++) {
                if (write(*fdlist, buf, 512) != 512) {
-                       fprintf(stderr, Name ": %s: cannot create"
+                       pr_err("%s: cannot create"
                                " backup file %s: %s\n",
                                devname, backup_file, strerror(errno));
                        return 0;
                }
        }
        if (fsync(*fdlist) != 0) {
-               fprintf(stderr, Name ": %s: cannot create backup file %s: %s\n",
+               pr_err("%s: cannot create backup file %s: %s\n",
                        devname, backup_file, strerror(errno));
                return 0;
        }
@@ -1023,6 +1014,10 @@ char *analyse_change(struct mdinfo *info, struct reshape *re)
                 * raid5 with 2 disks, or
                 * raid0 with 1 disk
                 */
+               if (info->new_level > 1 &&
+                   (info->component_size & 7))
+                       return "Cannot convert RAID1 of this size - "
+                               "reduce size to multiple of 4K first.";
                if (info->new_level == 0) {
                        if (info->delta_disks != UnSet &&
                            info->delta_disks != 0)
@@ -1275,7 +1270,7 @@ char *analyse_change(struct mdinfo *info, struct reshape *re)
                break;
 
        case 5:
-               /* We get to RAID5 for RAID5 or RAID6 */
+               /* We get to RAID5 from RAID5 or RAID6 */
                if (re->level != 5 && re->level != 6)
                        return "Cannot convert to RAID5 from this level";
 
@@ -1297,11 +1292,27 @@ char *analyse_change(struct mdinfo *info, struct reshape *re)
                                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";
+                               if (ls) {
+                                       /* Current RAID6 layout has a RAID5
+                                        * equivalent - good
+                                        */
+                                       strcat(strcpy(layout, ls), "-6");
+                                       l = map_name(r6layout, layout);
+                                       if (l == UnSet)
+                                               return "Cannot find RAID6 layout"
+                                                       " to convert to";
+                               } else {
+                                       /* Current RAID6 has no equivalent.
+                                        * If it is already a '-6' layout we
+                                        * can leave it unchanged, else we must
+                                        * fail
+                                        */
+                                       ls = map_num(r6layout, info->new_layout);
+                                       if (!ls ||
+                                           strcmp(ls+strlen(ls)-2, "-6") != 0)
+                                               return "Please specify new layout";
+                                       l = info->new_layout;
+                               }
                                re->after.layout = l;
                        }
                }
@@ -1366,6 +1377,44 @@ char *analyse_change(struct mdinfo *info, struct reshape *re)
        return NULL;
 }
 
+static int set_array_size(struct supertype *st, struct mdinfo *sra,
+                         char *text_version)
+{
+       struct mdinfo *info;
+       char *subarray;
+       int ret_val = -1;
+
+       if ((st == NULL) || (sra == NULL))
+               return ret_val;
+
+       if (text_version == NULL)
+               text_version = sra->text_version;
+       subarray = strchr(text_version+1, '/')+1;
+       info = st->ss->container_content(st, subarray);
+       if (info) {
+               unsigned long long current_size = 0;
+               unsigned long long new_size =
+                       info->custom_array_size/2;
+
+               if (sysfs_get_ll(sra, NULL, "array_size", &current_size) == 0 &&
+                   new_size > current_size) {
+                       if (sysfs_set_num(sra, NULL, "array_size", new_size)
+                                       < 0)
+                               dprintf("Error: Cannot set array size");
+                       else {
+                               ret_val = 0;
+                               dprintf("Array size changed");
+                       }
+                       dprintf(" from %llu to %llu.\n",
+                               current_size, new_size);
+               }
+               sysfs_free(info);
+       } else
+               dprintf("Error: set_array_size(): info pointer in NULL\n");
+
+       return ret_val;
+}
+
 static int reshape_array(char *container, int fd, char *devname,
                         struct supertype *st, struct mdinfo *info,
                         int force, struct mddev_dev *devlist,
@@ -1420,14 +1469,14 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
        struct mdinfo *sra;
 
        if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
-               fprintf(stderr, Name ": %s is not an active md array - aborting\n",
+               pr_err("%s is not an active md array - aborting\n",
                        devname);
                return 1;
        }
 
        if (size >= 0 &&
            (chunksize || level!= UnSet || layout_str || raid_disks)) {
-               fprintf(stderr, Name ": cannot change component size at the same time "
+               pr_err("cannot change component size at the same time "
                        "as other changes.\n"
                        "   Change size first, then check data is intact before "
                        "making other changes.\n");
@@ -1437,18 +1486,18 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
        if (raid_disks && raid_disks < array.raid_disks && array.level > 1 &&
            get_linux_version() < 2006032 &&
            !check_env("MDADM_FORCE_FEWER")) {
-               fprintf(stderr, Name ": reducing the number of devices is not safe before Linux 2.6.32\n"
+               pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
                        "       Please use a newer kernel\n");
                return 1;
        }
 
        st = super_by_fd(fd, &subarray);
        if (!st) {
-               fprintf(stderr, Name ": Unable to determine metadata format for %s\n", devname);
+               pr_err("Unable to determine metadata format for %s\n", devname);
                return 1;
        }
        if (raid_disks > st->max_devs) {
-               fprintf(stderr, Name ": Cannot increase raid-disks on this array"
+               pr_err("Cannot increase raid-disks on this array"
                        " beyond %d\n", st->max_devs);
                return 1;
        }
@@ -1471,7 +1520,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                        fd = cfd;
                }
                if (cfd < 0) {
-                       fprintf(stderr, Name ": Unable to open container for %s\n",
+                       pr_err("Unable to open container for %s\n",
                                devname);
                        free(subarray);
                        return 1;
@@ -1483,7 +1532,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                rv = st->ss->load_container(st, cfd, NULL);
 
                if (rv) {
-                       fprintf(stderr, Name ": Cannot read superblock for %s\n",
+                       pr_err("Cannot read superblock for %s\n",
                                devname);
                        free(subarray);
                        return 1;
@@ -1507,11 +1556,10 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                                    & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE))
                                        allow_reshape = 0;
                                if (!allow_reshape) {
-                                       fprintf(stderr, Name
-                                               " cannot reshape arrays in"
-                                               " container with unsupported"
-                                               " metadata: %s(%s)\n",
-                                               devname, container_buf);
+                                       pr_err("cannot reshape arrays in"
+                                              " container with unsupported"
+                                              " metadata: %s(%s)\n",
+                                              devname, container_buf);
                                        sysfs_free(cc);
                                        free(subarray);
                                        return 1;
@@ -1529,13 +1577,12 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
        if (raid_disks > array.raid_disks &&
            array.spare_disks +added_disks < (raid_disks - array.raid_disks) &&
            !force) {
-               fprintf(stderr,
-                       Name ": Need %d spare%s to avoid degraded array,"
-                       " and only have %d.\n"
-                       "       Use --force to over-ride this check.\n",
-                       raid_disks - array.raid_disks,
-                       raid_disks - array.raid_disks == 1 ? "" : "s",
-                       array.spare_disks + added_disks);
+               pr_err("Need %d spare%s to avoid degraded array,"
+                      " and only have %d.\n"
+                      "       Use --force to over-ride this check.\n",
+                      raid_disks - array.raid_disks,
+                      raid_disks - array.raid_disks == 1 ? "" : "s",
+                      array.spare_disks + added_disks);
                return 1;
        }
 
@@ -1547,7 +1594,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                        sra->array.level = LEVEL_CONTAINER;
                }
        } else {
-               fprintf(stderr, Name ": failed to read sysfs parameters for %s\n",
+               pr_err("failed to read sysfs parameters for %s\n",
                        devname);
                return 1;
        }
@@ -1557,7 +1604,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                sysfs_free(sra);
                return 1;
        } else if (frozen < 0) {
-               fprintf(stderr, Name ": %s is performing resync/recovery and cannot"
+               pr_err("%s is performing resync/recovery and cannot"
                        " be reshaped\n", devname);
                sysfs_free(sra);
                return 1;
@@ -1568,16 +1615,38 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                long long orig_size = get_component_size(fd)/2;
                long long min_csize;
                struct mdinfo *mdi;
+               int raid0_takeover = 0;
 
                if (orig_size == 0)
                        orig_size = array.size;
 
                if (reshape_super(st, size, UnSet, UnSet, 0, 0, UnSet, NULL,
-                                 devname, !quiet)) {
+                                 devname, APPLY_METADATA_CHANGES, !quiet)) {
                        rv = 1;
                        goto release;
                }
                sync_metadata(st);
+               if (st->ss->external) {
+                       /* metadata can have size limitation
+                        * update size value according to metadata information
+                        */
+                       struct mdinfo *sizeinfo =
+                               st->ss->container_content(st, subarray);
+                       if (sizeinfo) {
+                               unsigned long long new_size =
+                                       sizeinfo->custom_array_size/2;
+                               int data_disks = get_data_disks(
+                                               sizeinfo->array.level,
+                                               sizeinfo->array.layout,
+                                               sizeinfo->array.raid_disks);
+                               new_size /= data_disks;
+                               dprintf("Metadata size correction from %llu to "
+                                       "%llu (%llu)\n", orig_size, new_size,
+                                       new_size * data_disks);
+                               size = new_size;
+                               sysfs_free(sizeinfo);
+                       }
+               }
 
                /* Update the size of each member device in case
                 * they have been resized.  This will never reduce
@@ -1585,9 +1654,14 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                 * understands '0' to mean 'max'.
                 */
                min_csize = 0;
+               rv = 0;
                for (mdi = sra->devs; mdi; mdi = mdi->next) {
-                       if (sysfs_set_num(sra, mdi, "size", size) < 0)
+                       if (sysfs_set_num(sra, mdi, "size", size) < 0) {
+                               /* Probably kernel refusing to let us
+                                * reduce the size - not an error.
+                                */
                                break;
+                       }
                        if (array.not_persistent == 0 &&
                            array.major_version == 0 &&
                            get_linux_version() < 3001000) {
@@ -1602,20 +1676,46 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                                }
                        }
                }
+               if (rv) {
+                       pr_err("Cannot set size on "
+                               "array members.\n");
+                       goto size_change_error;
+               }
                if (min_csize && size > min_csize) {
-                       fprintf(stderr, Name ": Cannot safely make this array "
+                       pr_err("Cannot safely make this array "
                                "use more than 2TB per device on this kernel.\n");
                        rv = 1;
-                       goto release;
+                       goto size_change_error;
                }
                if (min_csize && size == 0) {
                        /* Don't let the kernel choose a size - it will get
                         * it wrong
                         */
-                       fprintf(stderr, Name ": Limited v0.90 array to "
-                               "2TB per device\n");
+                       pr_err("Limited v0.90 array to "
+                              "2TB per device\n");
                        size = min_csize;
                }
+               if (st->ss->external) {
+                       if (sra->array.level == 0) {
+                               rv = sysfs_set_str(sra, NULL, "level",
+                                                  "raid5");
+                               if (!rv) {
+                                       raid0_takeover = 1;
+                                       /* get array parametes after takeover
+                                        * to chane one parameter at time only
+                                        */
+                                       rv = ioctl(fd, GET_ARRAY_INFO, &array);
+                               }
+                       }
+                       /* make sure mdmon is
+                        * aware of the new level */
+                       if (!mdmon_running(st->container_dev))
+                               start_mdmon(st->container_dev);
+                       ping_monitor(container);
+                       if (mdmon_running(st->container_dev) &&
+                                       st->update_tail == NULL)
+                               st->update_tail = &st->updates;
+               }
 
                array.size = size;
                if (array.size != size) {
@@ -1627,20 +1727,41 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                                                   "component_size", size);
                        else
                                rv = -1;
-               } else
+               } else {
                        rv = ioctl(fd, SET_ARRAY_INFO, &array);
+
+                       /* manage array size when it is managed externally
+                        */
+                       if ((rv == 0) && st->ss->external)
+                               rv = set_array_size(st, sra, sra->text_version);
+               }
+
+               if (raid0_takeover) {
+                       /* do not recync non-existing parity,
+                        * we will drop it anyway
+                        */
+                       sysfs_set_str(sra, NULL, "sync_action", "frozen");
+                       /* go back to raid0, drop parity disk
+                        */
+                       sysfs_set_str(sra, NULL, "level", "raid0");
+                       ioctl(fd, GET_ARRAY_INFO, &array);
+               }
+
+size_change_error:
                if (rv != 0) {
                        int err = errno;
 
                        /* restore metadata */
                        if (reshape_super(st, orig_size, UnSet, UnSet, 0, 0,
-                                         UnSet, NULL, devname, !quiet) == 0)
+                                         UnSet, NULL, devname,
+                                         ROLLBACK_METADATA_CHANGES,
+                                         !quiet) == 0)
                                sync_metadata(st);
-                       fprintf(stderr, Name ": Cannot set device size for %s: %s\n",
+                       pr_err("Cannot set device size for %s: %s\n",
                                devname, strerror(err));
                        if (err == EBUSY &&
                            (array.state & (1<<MD_SB_BITMAP_PRESENT)))
-                               fprintf(stderr, "       Bitmap must be removed before size can be changed\n");
+                               cont_err("Bitmap must be removed before size can be changed\n");
                        rv = 1;
                        goto release;
                }
@@ -1650,7 +1771,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                         */
                        if (sra == NULL ||
                            sysfs_set_str(sra, NULL, "resync_start", "none") < 0)
-                               fprintf(stderr, Name ": --assume-clean not support with --grow on this kernel\n");
+                               pr_err("--assume-clean not support with --grow on this kernel\n");
                }
                ioctl(fd, GET_ARRAY_INFO, &array);
                size = get_component_size(fd)/2;
@@ -1658,11 +1779,11 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                        size = array.size;
                if (!quiet) {
                        if (size == orig_size)
-                               fprintf(stderr, Name ": component size of %s "
+                               pr_err("component size of %s "
                                        "unchanged at %lluK\n",
                                        devname, size);
                        else
-                               fprintf(stderr, Name ": component size of %s "
+                               pr_err("component size of %s "
                                        "has been set to %lluK\n",
                                        devname, size);
                }
@@ -1680,7 +1801,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
            (raid_disks == 0 || raid_disks == array.raid_disks)) {
                /* Nothing more to do */
                if (!changed && !quiet)
-                       fprintf(stderr, Name ": %s: no change requested\n",
+                       pr_err("%s: no change requested\n",
                                devname);
                goto release;
        }
@@ -1730,14 +1851,12 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                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",
-                               devname);
+                       pr_err("%s has a non-standard layout.  If you"
+                              " wish to preserve this\n", devname);
+                       cont_err("during the reshape, please specify"
+                                " --layout=preserve\n");
+                       cont_err("If you want to change it, specify a"
+                                " layout or use --layout=normalise\n");
                        rv = 1;
                        goto release;
                }
@@ -1753,9 +1872,35 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                                *h = 0;
                                info.new_layout = map_name(r6layout, l);
                        }
+               } else {
+                       pr_err("%s is only meaningful when reshaping"
+                              " a RAID6 array.\n", layout_str);
+                       rv = 1;
+                       goto release;
                }
        } else if (strcmp(layout_str, "preserve") == 0) {
-               info.new_layout = UnSet;
+               /* This means that a non-standard RAID6 layout
+                * is OK.
+                * In particular:
+                * - When reshape a RAID6 (e.g. adding a device)
+                *   which is in a non-standard layout, it is OK
+                *   to preserve that layout.
+                * - When converting a RAID5 to RAID6, leave it in
+                *   the XXX-6 layout, don't re-layout.
+                */
+               if (info.array.level == 6 && info.new_level == UnSet)
+                       info.new_layout = info.array.layout;
+               else if (info.array.level == 5 && info.new_level == 6) {
+                       char l[40];
+                       strcpy(l, map_num(r5layout, info.array.layout));
+                       strcat(l, "-6");
+                       info.new_layout = map_name(r6layout, l);
+               } else {
+                       pr_err("%s in only meaningful when reshaping"
+                              " to RAID6\n", layout_str);
+                       rv = 1;
+                       goto release;
+               }
        } else {
                int l = info.new_level;
                if (l == UnSet)
@@ -1774,13 +1919,13 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                        info.new_layout = parse_layout_faulty(layout_str);
                        break;
                default:
-                       fprintf(stderr, Name ": layout not meaningful"
+                       pr_err("layout not meaningful"
                                " with this level\n");
                        rv = 1;
                        goto release;
                }
                if (info.new_layout == UnSet) {
-                       fprintf(stderr, Name ": layout %s not understood"
+                       pr_err("layout %s not understood"
                                " for this level\n",
                                layout_str);
                        rv = 1;
@@ -1790,15 +1935,15 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
 
        if (array.level == LEVEL_FAULTY) {
                if (level != UnSet && level != array.level) {
-                       fprintf(stderr, Name ": cannot change level of Faulty device\n");
+                       pr_err("cannot change level of Faulty device\n");
                        rv =1 ;
                }
                if (chunksize) {
-                       fprintf(stderr, Name ": cannot set chunksize of Faulty device\n");
+                       pr_err("cannot set chunksize of Faulty device\n");
                        rv =1 ;
                }
                if (raid_disks && raid_disks != 1) {
-                       fprintf(stderr, Name ": cannot set raid_disks of Faulty device\n");
+                       pr_err("cannot set raid_disks of Faulty device\n");
                        rv =1 ;
                }
                if (layout_str) {
@@ -1808,7 +1953,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                        }
                        array.layout = info.new_layout;
                        if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
-                               fprintf(stderr, Name ": failed to set new layout\n");
+                               pr_err("failed to set new layout\n");
                                rv = 1;
                        } else if (!quiet)
                                printf("layout for %s set to %d\n",
@@ -1843,10 +1988,11 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
                /* Impose these changes on a single array.  First
                 * check that the metadata is OK with the change. */
 
-               if (reshape_super(st, info.component_size, info.new_level,
+               if (reshape_super(st, -1, info.new_level,
                                  info.new_layout, info.new_chunk,
                                  info.array.raid_disks, info.delta_disks,
-                                 backup_file, devname, quiet)) {
+                                 backup_file, devname, APPLY_METADATA_CHANGES,
+                                 quiet)) {
                        rv = 1;
                        goto release;
                }
@@ -1862,6 +2008,63 @@ release:
        return rv;
 }
 
+/* verify_reshape_position()
+ *     Function checks if reshape position in metadata is not farther
+ *     than position in md.
+ * Return value:
+ *      0 : not valid sysfs entry
+ *             it can be caused by not started reshape, it should be started
+ *             by reshape array or raid0 array is before takeover
+ *     -1 :    error, reshape position is obviously wrong
+ *      1 :    success, reshape progress correct or updated
+*/
+static int verify_reshape_position(struct mdinfo *info, int level)
+{
+       int ret_val = 0;
+       char buf[40];
+       int rv;
+
+       /* read sync_max, failure can mean raid0 array */
+       rv = sysfs_get_str(info, NULL, "sync_max", buf, 40);
+
+       if (rv > 0) {
+               char *ep;
+               unsigned long long position = strtoull(buf, &ep, 0);
+
+               dprintf(Name": Read sync_max sysfs entry is: %s\n", buf);
+               if (!(ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))) {
+                       position *= get_data_disks(level,
+                                                  info->new_layout,
+                                                  info->array.raid_disks);
+                       if (info->reshape_progress < position) {
+                               dprintf("Corrected reshape progress (%llu) to "
+                                       "md position (%llu)\n",
+                                       info->reshape_progress, position);
+                               info->reshape_progress = position;
+                               ret_val = 1;
+                       } else if (info->reshape_progress > position) {
+                               pr_err("Fatal error: array "
+                                      "reshape was not properly frozen "
+                                      "(expected reshape position is %llu, "
+                                      "but reshape progress is %llu.\n",
+                                      position, info->reshape_progress);
+                               ret_val = -1;
+                       } else {
+                               dprintf("Reshape position in md and metadata "
+                                       "are the same;");
+                               ret_val = 1;
+                       }
+               }
+       } else if (rv == 0) {
+               /* for valid sysfs entry, 0-length content
+                * should be indicated as error
+                */
+               ret_val = -1;
+       }
+
+       return ret_val;
+}
+
 static int reshape_array(char *container, int fd, char *devname,
                         struct supertype *st, struct mdinfo *info,
                         int force, struct mddev_dev *devlist,
@@ -1918,7 +2121,7 @@ static int reshape_array(char *container, int fd, char *devname,
        } else
                msg = analyse_change(info, &reshape);
        if (msg) {
-               fprintf(stderr, Name ": %s\n", msg);
+               pr_err("%s\n", msg);
                goto release;
        }
        if (restart &&
@@ -1926,11 +2129,23 @@ static int reshape_array(char *container, int fd, char *devname,
             reshape.before.layout != info->array.layout ||
             reshape.before.data_disks + reshape.parity
             != info->array.raid_disks - max(0, info->delta_disks))) {
-               fprintf(stderr, Name ": reshape info is not in native format -"
+               pr_err("reshape info is not in native format -"
                        " cannot continue.\n");
                goto release;
        }
 
+       if (st->ss->external && restart && (info->reshape_progress == 0)) {
+               /* When reshape is restarted from '0', very begin of array
+                * it is possible that for external metadata reshape and array
+                * configuration doesn't happen.
+                * Check if md has the same opinion, and reshape is restarted
+                * from 0. If so, this is regular reshape start after reshape
+                * switch in metadata to next array only.
+                */
+               if ((verify_reshape_position(info, reshape.level) >= 0) &&
+                   (info->reshape_progress == 0))
+                       restart = 0;
+       }
        if (restart) {
                /* reshape already started. just skip to monitoring the reshape */
                if (reshape.backup_blocks == 0)
@@ -1954,13 +2169,12 @@ static int reshape_array(char *container, int fd, char *devname,
        if (!force &&
            info->new_level > 1 && info->array.level > 1 &&
            spares_needed > info->array.spare_disks + added_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 + added_disks);
+               pr_err("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 + added_disks);
                goto release;
        }
        /* Check we have enough spares to not fail */
@@ -1969,12 +2183,11 @@ static int reshape_array(char *container, int fd, char *devname,
                - array.raid_disks;
        if ((info->new_level > 1 || info->new_level == 0) &&
            spares_needed > info->array.spare_disks +added_disks) {
-               fprintf(stderr,
-                       Name ": Need %d spare%s to create working array,"
-                       " and only have %d.\n",
-                       spares_needed,
-                       spares_needed == 1 ? "" : "s",
-                       info->array.spare_disks + added_disks);
+               pr_err("Need %d spare%s to create working array,"
+                      " and only have %d.\n",
+                      spares_needed,
+                      spares_needed == 1 ? "" : "s",
+                      info->array.spare_disks + added_disks);
                goto release;
        }
 
@@ -1987,22 +2200,25 @@ static int reshape_array(char *container, int fd, char *devname,
                err = sysfs_set_str(info, NULL, "level", c);
                if (err) {
                        err = errno;
-                       fprintf(stderr, Name ": %s: could not set level to %s\n",
+                       pr_err("%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");
+                               cont_err("Bitmap must be removed"
+                                        " before level can be changed\n");
                        goto release;
                }
                if (!quiet)
-                       fprintf(stderr, Name ": level of %s changed to %s\n",
+                       pr_err("level of %s changed to %s\n",
                                devname, c);
                orig_level = array.level;
                sysfs_freeze_array(info);
 
                if (reshape.level > 0 && st->ss->external) {
                        /* make sure mdmon is aware of the new level */
+                       if (mdmon_running(st->container_dev))
+                               flush_mdmon(container);
+
                        if (!mdmon_running(st->container_dev))
                                start_mdmon(st->container_dev);
                        ping_monitor(container);
@@ -2068,7 +2284,7 @@ static int reshape_array(char *container, int fd, char *devname,
                    info->new_layout != array.layout) {
                        array.layout = info->new_layout;
                        if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
-                               fprintf(stderr, Name ": failed to set new layout\n");
+                               pr_err("failed to set new layout\n");
                                goto release;
                        } else if (!quiet)
                                printf("layout for %s set to %d\n",
@@ -2079,7 +2295,7 @@ static int reshape_array(char *container, int fd, char *devname,
                    array.raid_disks != (info->array.raid_disks + info->delta_disks)) {
                        array.raid_disks += info->delta_disks;
                        if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
-                               fprintf(stderr, Name ": failed to set raid disks\n");
+                               pr_err("failed to set raid disks\n");
                                goto release;
                        } else if (!quiet) {
                                printf("raid_disks for %s set to %d\n",
@@ -2090,7 +2306,7 @@ static int reshape_array(char *container, int fd, char *devname,
                    info->new_chunk != array.chunk_size) {
                        if (sysfs_set_num(info, NULL,
                                          "chunk_size", info->new_chunk) != 0) {
-                               fprintf(stderr, Name ": failed to set chunk size\n");
+                               pr_err("failed to set chunk size\n");
                                goto release;
                        } else if (!quiet)
                                printf("chunk size for %s set to %d\n",
@@ -2137,11 +2353,10 @@ started:
        /* 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);
+               pr_err("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);
                goto release;
        }
 
@@ -2149,7 +2364,7 @@ started:
                         GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|GET_CHUNK|
                         GET_CACHE);
        if (!sra) {
-               fprintf(stderr, Name ": %s: Cannot get array details from sysfs\n",
+               pr_err("%s: Cannot get array details from sysfs\n",
                        devname);
                goto release;
        }
@@ -2168,11 +2383,11 @@ started:
                       blocks < 16*1024*2)
                        blocks *= 2;
        } else
-               fprintf(stderr, Name ": Need to backup %luK of critical "
+               pr_err("Need to backup %luK of critical "
                        "section..\n", blocks/2);
 
        if (blocks >= sra->component_size/2) {
-               fprintf(stderr, Name ": %s: Something wrong"
+               pr_err("%s: Something wrong"
                        " - reshape aborted\n",
                        devname);
                goto release;
@@ -2183,12 +2398,8 @@ started:
        nrdisks = max(reshape.before.data_disks,
                      reshape.after.data_disks) + reshape.parity
                + 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");
-               goto release;
-       }
+       fdlist = xcalloc((1+nrdisks), sizeof(int));
+       offsets = xcalloc((1+nrdisks), sizeof(offsets[0]));
 
        odisks = reshape.before.data_disks + reshape.parity;
        d = reshape_prepare_fdlist(devname, sra, odisks,
@@ -2202,11 +2413,11 @@ started:
                if (backup_file == NULL) {
                        if (reshape.after.data_disks <=
                            reshape.before.data_disks) {
-                               fprintf(stderr, Name ": %s: Cannot grow - "
+                               pr_err("%s: Cannot grow - "
                                        "need backup-file\n", devname);
                                goto release;
                        } else if (sra->array.spare_disks == 0) {
-                               fprintf(stderr, Name ": %s: Cannot grow - "
+                               pr_err("%s: Cannot grow - "
                                        "need a spare or backup-file to backup "
                                        "critical section\n", devname);
                                goto release;
@@ -2248,9 +2459,16 @@ started:
 
        sra->new_chunk = info->new_chunk;
 
-       if (restart)
+       if (restart) {
+               /* for external metadata checkpoint saved by mdmon can be lost
+                * or missed /due to e.g. crash/. Check if md is not during
+                * restart farther than metadata points to.
+                * If so, this means metadata information is obsolete.
+                */
+               if (st->ss->external)
+                       verify_reshape_position(info, reshape.level);
                sra->reshape_progress = info->reshape_progress;
-       else {
+       else {
                sra->reshape_progress = 0;
                if (reshape.after.data_disks < reshape.before.data_disks)
                        /* start from the end of the new array */
@@ -2268,15 +2486,13 @@ started:
                    ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
                        int err = errno;
 
-                       fprintf(stderr,
-                               Name ": Cannot set device shape for %s: %s\n",
-                               devname, strerror(errno));
+                       pr_err("Cannot set device shape for %s: %s\n",
+                              devname, strerror(errno));
 
                        if (err == EBUSY &&
                            (array.state & (1<<MD_SB_BITMAP_PRESENT)))
-                               fprintf(stderr,
-                                       "       Bitmap must be removed before"
-                                       " shape can be changed\n");
+                               cont_err("Bitmap must be removed before"
+                                        " shape can be changed\n");
 
                        goto release;
                }
@@ -2295,14 +2511,13 @@ started:
                                             reshape.parity) < 0)
                        err = errno;
                if (err) {
-                       fprintf(stderr, Name ": Cannot set device shape for %s\n",
+                       pr_err("Cannot set device shape for %s\n",
                                devname);
 
                        if (err == EBUSY &&
                            (array.state & (1<<MD_SB_BITMAP_PRESENT)))
-                               fprintf(stderr,
-                                       "       Bitmap must be removed before"
-                                       " shape can be changed\n");
+                               cont_err("Bitmap must be removed before"
+                                        " shape can be changed\n");
                        goto release;
                }
        }
@@ -2310,10 +2525,9 @@ started:
        err = start_reshape(sra, restart, reshape.before.data_disks,
                            reshape.after.data_disks);
        if (err) {
-               fprintf(stderr,
-                       Name ": Cannot %s reshape for %s\n",
-                       restart ? "continue" : "start",
-                       devname);
+               pr_err("Cannot %s reshape for %s\n",
+                      restart ? "continue" : "start",
+                      devname);
                goto release;
        }
        if (restart)
@@ -2322,8 +2536,8 @@ started:
                free(fdlist);
                free(offsets);
                sysfs_free(sra);
-               fprintf(stderr, Name ": Reshape has to be continued from"
-                       " location %llu when root fileststem has been mounted\n",
+               pr_err("Reshape has to be continued from"
+                       " location %llu when root filesystem has been mounted.\n",
                        sra->reshape_progress);
                return 1;
        }
@@ -2334,7 +2548,7 @@ started:
         */
        switch(forked ? 0 : fork()) {
        case -1:
-               fprintf(stderr, Name ": Cannot run child to monitor reshape: %s\n",
+               pr_err("Cannot run child to monitor reshape: %s\n",
                        strerror(errno));
                abort_reshape(sra);
                goto release;
@@ -2396,8 +2610,7 @@ started:
                /* Re-load the metadata as much could have changed */
                int cfd = open_dev(st->container_dev);
                if (cfd >= 0) {
-                       ping_manager(container);
-                       ping_monitor(container);
+                       flush_mdmon(container);
                        st->ss->free_super(st);
                        st->ss->load_container(st, cfd, container);
                        close(cfd);
@@ -2409,35 +2622,8 @@ started:
         */
        if (reshape.before.data_disks !=
            reshape.after.data_disks &&
-           info->custom_array_size) {
-               struct mdinfo *info2;
-               char *subarray = strchr(info->text_version+1, '/')+1;
-
-               info2 = st->ss->container_content(st, subarray);
-               if (info2) {
-                       unsigned long long current_size = 0;
-                       unsigned long long new_size =
-                               info2->custom_array_size/2;
-
-                       if (sysfs_get_ll(sra,
-                                        NULL,
-                                        "array_size",
-                                        &current_size) == 0 &&
-                           new_size > current_size) {
-                               if (sysfs_set_num(sra, NULL,
-                                                 "array_size", new_size)
-                                   < 0)
-                                       dprintf("Error: Cannot"
-                                               " set array size");
-                               else
-                                       dprintf("Array size "
-                                               "changed");
-                               dprintf(" from %llu to %llu.\n",
-                                       current_size, new_size);
-                       }
-                       sysfs_free(info2);
-               }
-       }
+           info->custom_array_size)
+               set_array_size(st, info, info->text_version);
 
        if (info->new_level != reshape.level) {
 
@@ -2445,9 +2631,8 @@ started:
                if (c) {
                        err = sysfs_set_str(sra, NULL, "level", c);
                        if (err)
-                               fprintf(stderr, Name\
-                                       ": %s: could not set level "
-                                       "to %s\n", devname, c);
+                               pr_err("%s: could not set level "
+                                      "to %s\n", devname, c);
                }
                if (info->new_level == 0)
                        st->update_tail = NULL;
@@ -2465,7 +2650,7 @@ release:
        if (orig_level != UnSet && sra) {
                c = map_num(pers, orig_level);
                if (c && sysfs_set_str(sra, NULL, "level", c) == 0)
-                       fprintf(stderr, Name ": aborting level change\n");
+                       pr_err("aborting level change\n");
        }
        sysfs_free(sra);
        if (!forked)
@@ -2494,7 +2679,8 @@ int reshape_container(char *container, char *devname,
            reshape_super(st, -1, info->new_level,
                          info->new_layout, info->new_chunk,
                          info->array.raid_disks, info->delta_disks,
-                         backup_file, devname, quiet)) {
+                         backup_file, devname, APPLY_METADATA_CHANGES,
+                         quiet)) {
                unfreeze(st);
                return 1;
        }
@@ -2556,6 +2742,13 @@ int reshape_container(char *container, char *devname,
                                                  devname2devnum(container));
                        if (!mdstat)
                                continue;
+                       if (mdstat->active == 0) {
+                               pr_err("Skipping inactive "
+                                       "array md%i.\n", mdstat->devnum);
+                               free_mdstat(mdstat);
+                               mdstat = NULL;
+                               continue;
+                       }
                        break;
                }
                if (!content)
@@ -2594,6 +2787,9 @@ int reshape_container(char *container, char *devname,
 
                sysfs_init(content, fd, mdstat->devnum);
 
+               if (mdmon_running(devname2devnum(container)))
+                       flush_mdmon(container);
+
                rv = reshape_array(container, fd, adev, st,
                                   content, force, NULL,
                                   backup_file, quiet, 1, restart,
@@ -2608,6 +2804,9 @@ int reshape_container(char *container, char *devname,
                restart = 0;
                if (rv)
                        break;
+
+               if (mdmon_running(devname2devnum(container)))
+                       flush_mdmon(container);
        }
        if (!rv)
                unfreeze(st);
@@ -3209,8 +3408,8 @@ static void validate(int afd, int bfd, unsigned long long offset)
                        free(abuf);
                        free(bbuf);
                        abuflen = len;
-                       abuf = malloc(abuflen);
-                       bbuf = malloc(abuflen);
+                       abuf = xmalloc(abuflen);
+                       bbuf = xmalloc(abuflen);
                }
 
                lseek64(bfd, offset+__le64_to_cpu(bsb2.devstart2)*512, 0);
@@ -3272,7 +3471,7 @@ int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape,
                        break;
        }
        if (!sd) {
-               fprintf(stderr, Name ": Cannot find a superblock\n");
+               pr_err("Cannot find a superblock\n");
                return 0;
        }
 
@@ -3467,7 +3666,7 @@ int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt
                if (i == old_disks-1) {
                        fd = open(backup_file, O_RDONLY);
                        if (fd<0) {
-                               fprintf(stderr, Name ": backup file %s inaccessible: %s\n",
+                               pr_err("backup file %s inaccessible: %s\n",
                                        backup_file, strerror(errno));
                                continue;
                        }
@@ -3485,7 +3684,7 @@ int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt
                        if (lseek64(fd,
                                    (dinfo.data_offset + dinfo.component_size - 8) <<9,
                                    0) < 0) {
-                               fprintf(stderr, Name ": Cannot seek on device %d\n", i);
+                               pr_err("Cannot seek on device %d\n", i);
                                continue; /* Cannot seek */
                        }
                        sprintf(namebuf, "device-%d", i);
@@ -3493,29 +3692,29 @@ int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt
                }
                if (read(fd, &bsb, sizeof(bsb)) != sizeof(bsb)) {
                        if (verbose)
-                               fprintf(stderr, Name ": Cannot read from %s\n", devname);
+                               pr_err("Cannot read from %s\n", devname);
                        continue; /* Cannot read */
                }
                if (memcmp(bsb.magic, "md_backup_data-1", 16) != 0 &&
                    memcmp(bsb.magic, "md_backup_data-2", 16) != 0) {
                        if (verbose)
-                               fprintf(stderr, Name ": No backup metadata on %s\n", devname);
+                               pr_err("No backup metadata on %s\n", devname);
                        continue;
                }
                if (bsb.sb_csum != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb))) {
                        if (verbose)
-                               fprintf(stderr, Name ": Bad backup-metadata checksum on %s\n", devname);
+                               pr_err("Bad backup-metadata checksum on %s\n", devname);
                        continue; /* bad checksum */
                }
                if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0 &&
                    bsb.sb_csum2 != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum2)-((char*)&bsb))) {
                        if (verbose)
-                               fprintf(stderr, Name ": Bad backup-metadata checksum2 on %s\n", devname);
+                               pr_err("Bad backup-metadata checksum2 on %s\n", devname);
                        continue; /* Bad second checksum */
                }
                if (memcmp(bsb.set_uuid,info->uuid, 16) != 0) {
                        if (verbose)
-                               fprintf(stderr, Name ": Wrong uuid on backup-metadata on %s\n", devname);
+                               pr_err("Wrong uuid on backup-metadata on %s\n", devname);
                        continue; /* Wrong uuid */
                }
 
@@ -3526,13 +3725,13 @@ int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt
                if (info->array.utime > (int)__le64_to_cpu(bsb.mtime) + 2*60*60 ||
                    info->array.utime < (int)__le64_to_cpu(bsb.mtime) - 10*60) {
                        if (check_env("MDADM_GROW_ALLOW_OLD")) {
-                               fprintf(stderr, Name ": accepting backup with timestamp %lu "
+                               pr_err("accepting backup with timestamp %lu "
                                        "for array with timestamp %lu\n",
                                        (unsigned long)__le64_to_cpu(bsb.mtime),
                                        (unsigned long)info->array.utime);
                        } else {
                                if (verbose)
-                                       fprintf(stderr, Name ": too-old timestamp on "
+                                       pr_err("too-old timestamp on "
                                                "backup-metadata on %s\n", devname);
                                continue; /* time stamp is too bad */
                        }
@@ -3548,8 +3747,7 @@ int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt
                                    < info->reshape_progress) {
                                nonew:
                                        if (verbose)
-                                               fprintf(stderr, Name
-                                                       ": backup-metadata found on %s but is not needed\n", devname);
+                                               pr_err("backup-metadata found on %s but is not needed\n", devname);
                                        continue; /* No new data here */
                                }
                        } else {
@@ -3583,9 +3781,8 @@ int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt
                if (lseek64(fd, __le64_to_cpu(bsb.devstart)*512, 0)< 0) {
                second_fail:
                        if (verbose)
-                               fprintf(stderr, Name
-                                       ": Failed to verify secondary backup-metadata block on %s\n",
-                                       devname);
+                               pr_err("Failed to verify secondary backup-metadata block on %s\n",
+                                      devname);
                        continue; /* Cannot seek */
                }
                /* There should be a duplicate backup superblock 4k before here */
@@ -3600,7 +3797,7 @@ int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt
                        goto second_fail; /* Cannot find leading superblock */
 
                /* Now need the data offsets for all devices. */
-               offsets = malloc(sizeof(*offsets)*info->array.raid_disks);
+               offsets = xmalloc(sizeof(*offsets)*info->array.raid_disks);
                for(j=0; j<info->array.raid_disks; j++) {
                        if (fdlist[j] < 0)
                                continue;
@@ -3623,7 +3820,7 @@ int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt
                                    __le64_to_cpu(bsb.length)*512, NULL)) {
                        /* didn't succeed, so giveup */
                        if (verbose)
-                               fprintf(stderr, Name ": Error restoring backup from %s\n",
+                               pr_err("Error restoring backup from %s\n",
                                        devname);
                        free(offsets);
                        return 1;
@@ -3641,7 +3838,7 @@ int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt
                                    __le64_to_cpu(bsb.length2)*512, NULL)) {
                        /* didn't succeed, so giveup */
                        if (verbose)
-                               fprintf(stderr, Name ": Error restoring second backup from %s\n",
+                               pr_err("Error restoring second backup from %s\n",
                                        devname);
                        free(offsets);
                        return 1;
@@ -3740,7 +3937,7 @@ int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt
        }
        /* needed to recover critical section! */
        if (verbose)
-               fprintf(stderr, Name ": Failed to find backup of critical section\n");
+               pr_err("Failed to find backup of critical section\n");
        return 1;
 }
 
@@ -3757,24 +3954,21 @@ int Grow_continue_command(char *devname, int fd,
        char buf[40];
        int cfd = -1;
        int fd2 = -1;
-       char *ep;
-       unsigned long long position;
 
        dprintf("Grow continue from command line called for %s\n",
                devname);
 
        st = super_by_fd(fd, &subarray);
        if (!st || !st->ss) {
-               fprintf(stderr,
-                       Name ": Unable to determine metadata format for %s\n",
-                       devname);
+               pr_err("Unable to determine metadata format for %s\n",
+                      devname);
                return 1;
        }
        dprintf("Grow continue is run for ");
        if (st->ss->external == 0) {
                dprintf("native array (%s)\n", devname);
                if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
-                       fprintf(stderr, Name ": %s is not an active md array -"
+                       pr_err("%s is not an active md array -"
                                " aborting\n", devname);
                        ret_val = 1;
                        goto Grow_continue_command_exit;
@@ -3796,7 +3990,7 @@ int Grow_continue_command(char *devname, int fd,
                        fd = cfd;
                }
                if (cfd < 0) {
-                       fprintf(stderr, Name ": Unable to open container "
+                       pr_err("Unable to open container "
                                "for %s\n", devname);
                        ret_val = 1;
                        goto Grow_continue_command_exit;
@@ -3807,9 +4001,8 @@ int Grow_continue_command(char *devname, int fd,
                 */
                ret_val = st->ss->load_container(st, cfd, NULL);
                if (ret_val) {
-                       fprintf(stderr,
-                               Name ": Cannot read superblock for %s\n",
-                               devname);
+                       pr_err("Cannot read superblock for %s\n",
+                              devname);
                        ret_val = 1;
                        goto Grow_continue_command_exit;
                }
@@ -3835,11 +4028,10 @@ int Grow_continue_command(char *devname, int fd,
                                allow_reshape = 0;
 
                        if (!allow_reshape) {
-                               fprintf(stderr, Name
-                                       ": cannot continue reshape of an array"
-                                       " in container with unsupported"
-                                       " metadata: %s(%s)\n",
-                                       devname, buf);
+                               pr_err("cannot continue reshape of an array"
+                                      " in container with unsupported"
+                                      " metadata: %s(%s)\n",
+                                      devname, buf);
                                ret_val = 1;
                                goto Grow_continue_command_exit;
                        }
@@ -3848,18 +4040,24 @@ int Grow_continue_command(char *devname, int fd,
                        mdstat = mdstat_by_subdev(array, container_dev);
                        if (!mdstat)
                                continue;
+                       if (mdstat->active == 0) {
+                               pr_err("Skipping inactive "
+                                       "array md%i.\n", mdstat->devnum);
+                               free_mdstat(mdstat);
+                               mdstat = NULL;
+                               continue;
+                       }
                        break;
                }
                if (!content) {
-                       fprintf(stderr,
-                               Name ": Unable to determine reshaped "
-                               "array for %s\n", devname);
+                       pr_err("Unable to determine reshaped "
+                              "array for %s\n", devname);
                        ret_val = 1;
                        goto Grow_continue_command_exit;
                }
                fd2 = open_dev(mdstat->devnum);
                if (fd2 < 0) {
-                       fprintf(stderr, Name ": cannot open (md%i)\n",
+                       pr_err("cannot open (md%i)\n",
                                mdstat->devnum);
                        ret_val = 1;
                        goto Grow_continue_command_exit;
@@ -3876,7 +4074,7 @@ int Grow_continue_command(char *devname, int fd,
                if (mdmon_running(container_dev))
                        st->update_tail = &st->updates;
                else {
-                       fprintf(stderr, Name ":  No mdmon found. "
+                       pr_err("No mdmon found. "
                                "Grow cannot continue.\n");
                        ret_val = 1;
                        goto Grow_continue_command_exit;
@@ -3886,28 +4084,8 @@ int Grow_continue_command(char *devname, int fd,
        /* verify that array under reshape is started from
         * correct position
         */
-       ret_val = sysfs_get_str(content, NULL, "sync_max", buf, 40);
-       if (ret_val <= 0) {
-               fprintf(stderr, Name
-                       ": cannot open verify reshape progress for %s (%i)\n",
-                       content->sys_name, ret_val);
-               ret_val = 1;
-               goto Grow_continue_command_exit;
-       }
-       dprintf(Name ": Read sync_max sysfs entry is: %s\n", buf);
-       position = strtoull(buf, &ep, 0);
-       if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) {
-               fprintf(stderr, Name ": Fatal error: array reshape was"
-                       " not properly frozen\n");
-               ret_val = 1;
-               goto Grow_continue_command_exit;
-       }
-       position *= get_data_disks(map_name(pers, mdstat->level),
-                                  content->new_layout,
-                                  content->array.raid_disks);
-       if (position != content->reshape_progress) {
-               fprintf(stderr, Name ": Fatal error: array reshape was"
-                       " not properly frozen.\n");
+       if (verify_reshape_position(content,
+                                   map_name(pers, mdstat->level)) < 0) {
                ret_val = 1;
                goto Grow_continue_command_exit;
        }