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authorMichael Tokarev <mjt@tls.msk.ru>2014-12-20 08:48:44 +0000
committerMichael Tokarev <mjt@tls.msk.ru>2014-12-20 08:48:44 +0000
commit489bea7ee8e1dbecfa517b8415568044ab57c73a (patch)
tree44d4878d4c7da3f4908ea9a765ef9b8f9c141756 /Grow.c
mdadm (3.3.2-5) unstable; urgency=medium
* use-tempnode-not-devnode.patch: change udev rules file to use $tempnode which works both on wheezy and jessie udev, instead of $devnode which only works in jessie. At this stage it is better to make rules file compatible with old version instead of adding versioned dependency. Should be removed for jessie+1. (Closes: #770883) * fix Closes: list in previous entry (Closes: #771852) # imported from the archive
Diffstat (limited to 'Grow.c')
-rw-r--r--Grow.c4998
1 files changed, 4998 insertions, 0 deletions
diff --git a/Grow.c b/Grow.c
new file mode 100644
index 00000000..a9c8589c
--- /dev/null
+++ b/Grow.c
@@ -0,0 +1,4998 @@
+/*
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2001-2013 Neil Brown <neilb@suse.de>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Neil Brown
+ * Email: <neilb@suse.de>
+ */
+#include "mdadm.h"
+#include "dlink.h"
+#include <sys/mman.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <signal.h>
+#include <sys/wait.h>
+
+#if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
+#error no endian defined
+#endif
+#include "md_u.h"
+#include "md_p.h"
+
+int restore_backup(struct supertype *st,
+ struct mdinfo *content,
+ int working_disks,
+ int next_spare,
+ char **backup_filep,
+ int verbose)
+{
+ int i;
+ int *fdlist;
+ struct mdinfo *dev;
+ int err;
+ int disk_count = next_spare + working_disks;
+ char *backup_file = *backup_filep;
+
+ dprintf("Called restore_backup()\n");
+ fdlist = xmalloc(sizeof(int) * disk_count);
+
+ enable_fds(next_spare);
+ for (i = 0; i < next_spare; i++)
+ fdlist[i] = -1;
+ for (dev = content->devs; dev; dev = dev->next) {
+ char buf[22];
+ int fd;
+ sprintf(buf, "%d:%d",
+ dev->disk.major,
+ dev->disk.minor);
+ fd = dev_open(buf, O_RDWR);
+
+ if (dev->disk.raid_disk >= 0)
+ fdlist[dev->disk.raid_disk] = fd;
+ else
+ fdlist[next_spare++] = fd;
+ }
+
+ if (!backup_file) {
+ backup_file = locate_backup(content->sys_name);
+ *backup_filep = backup_file;
+ }
+
+ if (st->ss->external && st->ss->recover_backup)
+ err = st->ss->recover_backup(st, content);
+ else
+ err = Grow_restart(st, content, fdlist, next_spare,
+ backup_file, verbose > 0);
+
+ while (next_spare > 0) {
+ next_spare--;
+ if (fdlist[next_spare] >= 0)
+ close(fdlist[next_spare]);
+ }
+ free(fdlist);
+ if (err) {
+ pr_err("Failed to restore critical"
+ " section for reshape - sorry.\n");
+ if (!backup_file)
+ pr_err("Possibly you need"
+ " to specify a --backup-file\n");
+ return 1;
+ }
+
+ dprintf("restore_backup() returns status OK.\n");
+ return 0;
+}
+
+int Grow_Add_device(char *devname, int fd, char *newdev)
+{
+ /* Add a device to an active array.
+ * Currently, just extend a linear array.
+ * This requires writing a new superblock on the
+ * new device, calling the kernel to add the device,
+ * and if that succeeds, update the superblock on
+ * all other devices.
+ * This means that we need to *find* all other devices.
+ */
+ struct mdinfo info;
+
+ struct stat stb;
+ int nfd, fd2;
+ int d, nd;
+ struct supertype *st = NULL;
+ char *subarray = NULL;
+
+ if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
+ pr_err("cannot get array info for %s\n", devname);
+ return 1;
+ }
+
+ if (info.array.level != -1) {
+ pr_err("can only add devices to linear arrays\n");
+ return 1;
+ }
+
+ st = super_by_fd(fd, &subarray);
+ if (!st) {
+ pr_err("cannot handle arrays with superblock version %d\n",
+ info.array.major_version);
+ return 1;
+ }
+
+ if (subarray) {
+ pr_err("Cannot grow linear sub-arrays yet\n");
+ free(subarray);
+ free(st);
+ return 1;
+ }
+
+ nfd = open(newdev, O_RDWR|O_EXCL|O_DIRECT);
+ if (nfd < 0) {
+ pr_err("cannot open %s\n", newdev);
+ free(st);
+ return 1;
+ }
+ fstat(nfd, &stb);
+ if ((stb.st_mode & S_IFMT) != S_IFBLK) {
+ pr_err("%s is not a block device!\n", newdev);
+ close(nfd);
+ free(st);
+ return 1;
+ }
+ /* now check out all the devices and make sure we can read the
+ * superblock */
+ for (d=0 ; d < info.array.raid_disks ; d++) {
+ mdu_disk_info_t disk;
+ char *dv;
+
+ st->ss->free_super(st);
+
+ disk.number = d;
+ if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
+ pr_err("cannot get device detail for device %d\n",
+ d);
+ close(nfd);
+ free(st);
+ return 1;
+ }
+ dv = map_dev(disk.major, disk.minor, 1);
+ if (!dv) {
+ pr_err("cannot find device file for device %d\n",
+ d);
+ close(nfd);
+ free(st);
+ return 1;
+ }
+ fd2 = dev_open(dv, O_RDWR);
+ if (fd2 < 0) {
+ pr_err("cannot open device file %s\n", dv);
+ close(nfd);
+ free(st);
+ return 1;
+ }
+
+ if (st->ss->load_super(st, fd2, NULL)) {
+ pr_err("cannot find super block on %s\n", dv);
+ close(nfd);
+ close(fd2);
+ free(st);
+ return 1;
+ }
+ close(fd2);
+ }
+ /* Ok, looks good. Lets update the superblock and write it out to
+ * newdev.
+ */
+
+ info.disk.number = d;
+ info.disk.major = major(stb.st_rdev);
+ info.disk.minor = minor(stb.st_rdev);
+ info.disk.raid_disk = d;
+ info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
+ st->ss->update_super(st, &info, "linear-grow-new", newdev,
+ 0, 0, NULL);
+
+ if (st->ss->store_super(st, nfd)) {
+ pr_err("Cannot store new superblock on %s\n",
+ newdev);
+ close(nfd);
+ return 1;
+ }
+ close(nfd);
+
+ if (ioctl(fd, ADD_NEW_DISK, &info.disk) != 0) {
+ pr_err("Cannot add new disk to this array\n");
+ return 1;
+ }
+ /* Well, that seems to have worked.
+ * Now go through and update all superblocks
+ */
+
+ if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
+ pr_err("cannot get array info for %s\n", devname);
+ return 1;
+ }
+
+ nd = d;
+ for (d=0 ; d < info.array.raid_disks ; d++) {
+ mdu_disk_info_t disk;
+ char *dv;
+
+ disk.number = d;
+ if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
+ pr_err("cannot get device detail for device %d\n",
+ d);
+ return 1;
+ }
+ dv = map_dev(disk.major, disk.minor, 1);
+ if (!dv) {
+ pr_err("cannot find device file for device %d\n",
+ d);
+ return 1;
+ }
+ fd2 = dev_open(dv, O_RDWR);
+ if (fd2 < 0) {
+ pr_err("cannot open device file %s\n", dv);
+ return 1;
+ }
+ if (st->ss->load_super(st, fd2, NULL)) {
+ pr_err("cannot find super block on %s\n", dv);
+ close(fd);
+ return 1;
+ }
+ info.array.raid_disks = nd+1;
+ info.array.nr_disks = nd+1;
+ info.array.active_disks = nd+1;
+ info.array.working_disks = nd+1;
+
+ st->ss->update_super(st, &info, "linear-grow-update", dv,
+ 0, 0, NULL);
+
+ if (st->ss->store_super(st, fd2)) {
+ pr_err("Cannot store new superblock on %s\n", dv);
+ close(fd2);
+ return 1;
+ }
+ close(fd2);
+ }
+
+ return 0;
+}
+
+int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
+{
+ /*
+ * First check that array doesn't have a bitmap
+ * Then create the bitmap
+ * Then add it
+ *
+ * For internal bitmaps, we need to check the version,
+ * find all the active devices, and write the bitmap block
+ * to all devices
+ */
+ mdu_bitmap_file_t bmf;
+ mdu_array_info_t array;
+ struct supertype *st;
+ char *subarray = NULL;
+ int major = BITMAP_MAJOR_HI;
+ int vers = md_get_version(fd);
+ unsigned long long bitmapsize, array_size;
+
+ if (vers < 9003) {
+ major = BITMAP_MAJOR_HOSTENDIAN;
+ pr_err("Warning - bitmaps created on this kernel"
+ " are not portable\n"
+ " between different architectures. Consider upgrading"
+ " the Linux kernel.\n");
+ }
+
+ if (ioctl(fd, GET_BITMAP_FILE, &bmf) != 0) {
+ if (errno == ENOMEM)
+ pr_err("Memory allocation failure.\n");
+ else
+ pr_err("bitmaps not supported by this kernel.\n");
+ return 1;
+ }
+ if (bmf.pathname[0]) {
+ if (strcmp(s->bitmap_file,"none")==0) {
+ if (ioctl(fd, SET_BITMAP_FILE, -1)!= 0) {
+ pr_err("failed to remove bitmap %s\n",
+ bmf.pathname);
+ return 1;
+ }
+ return 0;
+ }
+ pr_err("%s already has a bitmap (%s)\n",
+ devname, bmf.pathname);
+ return 1;
+ }
+ if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
+ pr_err("cannot get array status for %s\n", devname);
+ return 1;
+ }
+ if (array.state & (1<<MD_SB_BITMAP_PRESENT)) {
+ if (strcmp(s->bitmap_file, "none")==0) {
+ array.state &= ~(1<<MD_SB_BITMAP_PRESENT);
+ if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) {
+ pr_err("failed to remove internal bitmap.\n");
+ return 1;
+ }
+ return 0;
+ }
+ pr_err("Internal bitmap already present on %s\n",
+ devname);
+ return 1;
+ }
+
+ if (strcmp(s->bitmap_file, "none") == 0) {
+ pr_err("no bitmap found on %s\n", devname);
+ return 1;
+ }
+ if (array.level <= 0) {
+ pr_err("Bitmaps not meaningful with level %s\n",
+ map_num(pers, array.level)?:"of this array");
+ return 1;
+ }
+ bitmapsize = array.size;
+ bitmapsize <<= 1;
+ if (get_dev_size(fd, NULL, &array_size) &&
+ array_size > (0x7fffffffULL<<9)) {
+ /* Array is big enough that we cannot trust array.size
+ * try other approaches
+ */
+ bitmapsize = get_component_size(fd);
+ }
+ if (bitmapsize == 0) {
+ pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
+ return 1;
+ }
+
+ if (array.level == 10) {
+ int ncopies = (array.layout&255)*((array.layout>>8)&255);
+ bitmapsize = bitmapsize * array.raid_disks / ncopies;
+ }
+
+ st = super_by_fd(fd, &subarray);
+ if (!st) {
+ pr_err("Cannot understand version %d.%d\n",
+ array.major_version, array.minor_version);
+ return 1;
+ }
+ if (subarray) {
+ pr_err("Cannot add bitmaps to sub-arrays yet\n");
+ free(subarray);
+ free(st);
+ return 1;
+ }
+ if (strcmp(s->bitmap_file, "internal") == 0) {
+ int rv;
+ int d;
+ int offset_setable = 0;
+ struct mdinfo *mdi;
+ if (st->ss->add_internal_bitmap == NULL) {
+ pr_err("Internal bitmaps not supported "
+ "with %s metadata\n", st->ss->name);
+ return 1;
+ }
+ mdi = sysfs_read(fd, NULL, GET_BITMAP_LOCATION);
+ if (mdi)
+ offset_setable = 1;
+ for (d=0; d< st->max_devs; d++) {
+ mdu_disk_info_t disk;
+ char *dv;
+ disk.number = d;
+ if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
+ continue;
+ if (disk.major == 0 &&
+ disk.minor == 0)
+ continue;
+ if ((disk.state & (1<<MD_DISK_SYNC))==0)
+ continue;
+ dv = map_dev(disk.major, disk.minor, 1);
+ if (dv) {
+ int fd2 = dev_open(dv, O_RDWR);
+ if (fd2 < 0)
+ continue;
+ if (st->ss->load_super(st, fd2, NULL)==0) {
+ if (st->ss->add_internal_bitmap(
+ st,
+ &s->bitmap_chunk, c->delay, s->write_behind,
+ bitmapsize, offset_setable,
+ major)
+ )
+ st->ss->write_bitmap(st, fd2);
+ else {
+ pr_err("failed to create internal bitmap"
+ " - chunksize problem.\n");
+ close(fd2);
+ return 1;
+ }
+ }
+ close(fd2);
+ }
+ }
+ if (offset_setable) {
+ st->ss->getinfo_super(st, mdi, NULL);
+ sysfs_init(mdi, fd, NULL);
+ 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)
+ pr_err("Cannot add bitmap while array is"
+ " resyncing or reshaping etc.\n");
+ pr_err("failed to set internal bitmap.\n");
+ return 1;
+ }
+ } else {
+ int uuid[4];
+ int bitmap_fd;
+ int d;
+ int max_devs = st->max_devs;
+
+ /* try to load a superblock */
+ for (d = 0; d < max_devs; d++) {
+ mdu_disk_info_t disk;
+ char *dv;
+ int fd2;
+ disk.number = d;
+ if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
+ continue;
+ if ((disk.major==0 && disk.minor==0) ||
+ (disk.state & (1<<MD_DISK_REMOVED)))
+ continue;
+ dv = map_dev(disk.major, disk.minor, 1);
+ if (!dv)
+ continue;
+ fd2 = dev_open(dv, O_RDONLY);
+ if (fd2 >= 0) {
+ if (st->ss->load_super(st, fd2, NULL) == 0) {
+ close(fd2);
+ st->ss->uuid_from_super(st, uuid);
+ break;
+ }
+ close(fd2);
+ }
+ }
+ if (d == max_devs) {
+ pr_err("cannot find UUID for array!\n");
+ return 1;
+ }
+ if (CreateBitmap(s->bitmap_file, c->force, (char*)uuid, s->bitmap_chunk,
+ c->delay, s->write_behind, bitmapsize, major)) {
+ return 1;
+ }
+ bitmap_fd = open(s->bitmap_file, O_RDWR);
+ if (bitmap_fd < 0) {
+ pr_err("weird: %s cannot be opened\n",
+ s->bitmap_file);
+ return 1;
+ }
+ if (ioctl(fd, SET_BITMAP_FILE, bitmap_fd) < 0) {
+ int err = errno;
+ if (errno == EBUSY)
+ 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;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * When reshaping an array we might need to backup some data.
+ * This is written to all spares with a 'super_block' describing it.
+ * The superblock goes 4K from the end of the used space on the
+ * device.
+ * It if written after the backup is complete.
+ * It has the following structure.
+ */
+
+static struct mdp_backup_super {
+ char magic[16]; /* md_backup_data-1 or -2 */
+ __u8 set_uuid[16];
+ __u64 mtime;
+ /* start/sizes in 512byte sectors */
+ __u64 devstart; /* address on backup device/file of data */
+ __u64 arraystart;
+ __u64 length;
+ __u32 sb_csum; /* csum of preceeding bytes. */
+ __u32 pad1;
+ __u64 devstart2; /* offset in to data of second section */
+ __u64 arraystart2;
+ __u64 length2;
+ __u32 sb_csum2; /* csum of preceeding bytes. */
+ __u8 pad[512-68-32];
+} __attribute__((aligned(512))) bsb, bsb2;
+
+static __u32 bsb_csum(char *buf, int len)
+{
+ int i;
+ int csum = 0;
+ for (i = 0; i < len; i++)
+ csum = (csum<<3) + buf[0];
+ return __cpu_to_le32(csum);
+}
+
+static int check_idle(struct supertype *st)
+{
+ /* Check that all member arrays for this container, or the
+ * container of this array, are idle
+ */
+ char *container = (st->container_devnm[0]
+ ? st->container_devnm : st->devnm);
+ struct mdstat_ent *ent, *e;
+ int is_idle = 1;
+
+ ent = mdstat_read(0, 0);
+ for (e = ent ; e; e = e->next) {
+ if (!is_container_member(e, container))
+ continue;
+ if (e->percent >= 0) {
+ is_idle = 0;
+ break;
+ }
+ }
+ free_mdstat(ent);
+ return is_idle;
+}
+
+static int freeze_container(struct supertype *st)
+{
+ char *container = (st->container_devnm[0]
+ ? st->container_devnm : st->devnm);
+
+ if (!check_idle(st))
+ return -1;
+
+ if (block_monitor(container, 1)) {
+ pr_err("failed to freeze container\n");
+ return -2;
+ }
+
+ return 1;
+}
+
+static void unfreeze_container(struct supertype *st)
+{
+ char *container = (st->container_devnm[0]
+ ? st->container_devnm : st->devnm);
+
+ unblock_monitor(container, 1);
+}
+
+static int freeze(struct supertype *st)
+{
+ /* Try to freeze resync/rebuild on this array/container.
+ * Return -1 if the array is busy,
+ * return -2 container cannot be frozen,
+ * return 0 if this kernel doesn't support 'frozen'
+ * return 1 if it worked.
+ */
+ if (st->ss->external)
+ return freeze_container(st);
+ else {
+ struct mdinfo *sra = sysfs_read(-1, st->devnm, GET_VERSION);
+ int err;
+ char buf[20];
+
+ if (!sra)
+ return -1;
+ /* Need to clear any 'read-auto' status */
+ if (sysfs_get_str(sra, NULL, "array_state", buf, 20) > 0 &&
+ strncmp(buf, "read-auto", 9) == 0)
+ sysfs_set_str(sra, NULL, "array_state", "clean");
+
+ err = sysfs_freeze_array(sra);
+ sysfs_free(sra);
+ return err;
+ }
+}
+
+static void unfreeze(struct supertype *st)
+{
+ if (st->ss->external)
+ return unfreeze_container(st);
+ else {
+ struct mdinfo *sra = sysfs_read(-1, st->devnm, GET_VERSION);
+ char buf[20];
+
+ if (sra &&
+ sysfs_get_str(sra, NULL, "sync_action", buf, 20) > 0
+ && strcmp(buf, "frozen\n") == 0) {
+ printf("unfreeze\n");
+ sysfs_set_str(sra, NULL, "sync_action", "idle");
+ }
+ sysfs_free(sra);
+ }
+}
+
+static void wait_reshape(struct mdinfo *sra)
+{
+ int fd = sysfs_get_fd(sra, NULL, "sync_action");
+ char action[20];
+
+ if (fd < 0)
+ return;
+
+ while (sysfs_fd_get_str(fd, action, 20) > 0 &&
+ strncmp(action, "reshape", 7) == 0)
+ sysfs_wait(fd, NULL);
+ close(fd);
+}
+
+static int reshape_super(struct supertype *st, unsigned long long size,
+ int level, int layout, int chunksize, int raid_disks,
+ int delta_disks, char *backup_file, char *dev,
+ 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) {
+ 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,
+ direction, verbose);
+}
+
+static void sync_metadata(struct supertype *st)
+{
+ if (st->ss->external) {
+ if (st->update_tail) {
+ flush_metadata_updates(st);
+ st->update_tail = &st->updates;
+ } else
+ st->ss->sync_metadata(st);
+ }
+}
+
+static int subarray_set_num(char *container, struct mdinfo *sra, char *name, int n)
+{
+ /* when dealing with external metadata subarrays we need to be
+ * prepared to handle EAGAIN. The kernel may need to wait for
+ * mdmon to mark the array active so the kernel can handle
+ * allocations/writeback when preparing the reshape action
+ * (md_allow_write()). We temporarily disable safe_mode_delay
+ * to close a race with the array_state going clean before the
+ * next write to raid_disks / stripe_cache_size
+ */
+ char safe[50];
+ int rc;
+
+ /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
+ if (!container ||
+ (strcmp(name, "raid_disks") != 0 &&
+ strcmp(name, "stripe_cache_size") != 0))
+ return sysfs_set_num(sra, NULL, name, n);
+
+ rc = sysfs_get_str(sra, NULL, "safe_mode_delay", safe, sizeof(safe));
+ if (rc <= 0)
+ return -1;
+ sysfs_set_num(sra, NULL, "safe_mode_delay", 0);
+ rc = sysfs_set_num(sra, NULL, name, n);
+ if (rc < 0 && errno == EAGAIN) {
+ ping_monitor(container);
+ /* if we get EAGAIN here then the monitor is not active
+ * so stop trying
+ */
+ rc = sysfs_set_num(sra, NULL, name, n);
+ }
+ sysfs_set_str(sra, NULL, "safe_mode_delay", safe);
+ return rc;
+}
+
+int start_reshape(struct mdinfo *sra, int already_running,
+ int before_data_disks, int data_disks)
+{
+ int err;
+ unsigned long long sync_max_to_set;
+
+ sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
+ err = sysfs_set_num(sra, NULL, "suspend_hi", sra->reshape_progress);
+ err = err ?: sysfs_set_num(sra, NULL, "suspend_lo",
+ sra->reshape_progress);
+ if (before_data_disks <= data_disks)
+ sync_max_to_set = sra->reshape_progress / data_disks;
+ else
+ sync_max_to_set = (sra->component_size * data_disks
+ - sra->reshape_progress) / data_disks;
+ if (!already_running)
+ sysfs_set_num(sra, NULL, "sync_min", sync_max_to_set);
+ err = err ?: sysfs_set_num(sra, NULL, "sync_max", sync_max_to_set);
+ if (!already_running)
+ err = err ?: sysfs_set_str(sra, NULL, "sync_action", "reshape");
+
+ return err;
+}
+
+void abort_reshape(struct mdinfo *sra)
+{
+ sysfs_set_str(sra, NULL, "sync_action", "idle");
+ sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
+ sysfs_set_num(sra, NULL, "suspend_hi", 0);
+ sysfs_set_num(sra, NULL, "suspend_lo", 0);
+ sysfs_set_num(sra, NULL, "sync_min", 0);
+ // It isn't safe to reset sync_max as we aren't monitoring.
+ // Array really should be stopped at this point.
+}
+
+int remove_disks_for_takeover(struct supertype *st,
+ struct mdinfo *sra,
+ int layout)
+{
+ int nr_of_copies;
+ struct mdinfo *remaining;
+ int slot;
+
+ if (sra->array.level == 10)
+ nr_of_copies = layout & 0xff;
+ else if (sra->array.level == 1)
+ nr_of_copies = sra->array.raid_disks;
+ else
+ return 1;
+
+ remaining = sra->devs;
+ sra->devs = NULL;
+ /* for each 'copy', select one device and remove from the list. */
+ for (slot = 0; slot < sra->array.raid_disks; slot += nr_of_copies) {
+ struct mdinfo **diskp;
+ int found = 0;
+
+ /* Find a working device to keep */
+ for (diskp = &remaining; *diskp ; diskp = &(*diskp)->next) {
+ struct mdinfo *disk = *diskp;
+
+ if (disk->disk.raid_disk < slot)
+ continue;
+ if (disk->disk.raid_disk >= slot + nr_of_copies)
+ continue;
+ if (disk->disk.state & (1<<MD_DISK_REMOVED))
+ continue;
+ if (disk->disk.state & (1<<MD_DISK_FAULTY))
+ continue;
+ if (!(disk->disk.state & (1<<MD_DISK_SYNC)))
+ continue;
+
+ /* We have found a good disk to use! */
+ *diskp = disk->next;
+ disk->next = sra->devs;
+ sra->devs = disk;
+ found = 1;
+ break;
+ }
+ if (!found)
+ break;
+ }
+
+ if (slot < sra->array.raid_disks) {
+ /* didn't find all slots */
+ struct mdinfo **e;
+ e = &remaining;
+ while (*e)
+ e = &(*e)->next;
+ *e = sra->devs;
+ sra->devs = remaining;
+ return 1;
+ }
+
+ /* Remove all 'remaining' devices from the array */
+ while (remaining) {
+ struct mdinfo *sd = remaining;
+ remaining = sd->next;
+
+ sysfs_set_str(sra, sd, "state", "faulty");
+ sysfs_set_str(sra, sd, "slot", "none");
+ /* for external metadata disks should be removed in mdmon */
+ if (!st->ss->external)
+ sysfs_set_str(sra, sd, "state", "remove");
+ sd->disk.state |= (1<<MD_DISK_REMOVED);
+ sd->disk.state &= ~(1<<MD_DISK_SYNC);
+ sd->next = sra->devs;
+ sra->devs = sd;
+ }
+ return 0;
+}
+
+void reshape_free_fdlist(int *fdlist,
+ unsigned long long *offsets,
+ int size)
+{
+ int i;
+
+ for (i = 0; i < size; i++)
+ if (fdlist[i] >= 0)
+ close(fdlist[i]);
+
+ free(fdlist);
+ free(offsets);
+}
+
+int reshape_prepare_fdlist(char *devname,
+ struct mdinfo *sra,
+ int raid_disks,
+ int nrdisks,
+ unsigned long blocks,
+ char *backup_file,
+ int *fdlist,
+ unsigned long long *offsets)
+{
+ int d = 0;
+ struct mdinfo *sd;
+
+ enable_fds(nrdisks);
+ for (d = 0; d <= nrdisks; d++)
+ fdlist[d] = -1;
+ d = raid_disks;
+ 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);
+ fdlist[sd->disk.raid_disk]
+ = dev_open(dn, O_RDONLY);
+ offsets[sd->disk.raid_disk] = sd->data_offset*512;
+ if (fdlist[sd->disk.raid_disk] < 0) {
+ pr_err("%s: cannot open component %s\n",
+ devname, dn ? dn : "-unknown-");
+ d = -1;
+ goto release;
+ }
+ } else if (backup_file == NULL) {
+ /* spare */
+ char *dn = map_dev(sd->disk.major,
+ sd->disk.minor, 1);
+ fdlist[d] = dev_open(dn, O_RDWR);
+ offsets[d] = (sd->data_offset + sra->component_size - blocks - 8)*512;
+ if (fdlist[d] < 0) {
+ pr_err("%s: cannot open component %s\n",
+ devname, dn ? dn : "-unknown-");
+ d = -1;
+ goto release;
+ }
+ d++;
+ }
+ }
+release:
+ return d;
+}
+
+int reshape_open_backup_file(char *backup_file,
+ int fd,
+ char *devname,
+ long blocks,
+ int *fdlist,
+ unsigned long long *offsets,
+ char *sys_name,
+ int restart)
+{
+ /* Return 1 on success, 0 on any form of failure */
+ /* need to check backup file is large enough */
+ char buf[512];
+ struct stat stb;
+ unsigned int dev;
+ int i;
+
+ *fdlist = open(backup_file, O_RDWR|O_CREAT|(restart ? O_TRUNC : O_EXCL),
+ S_IRUSR | S_IWUSR);
+ *offsets = 8 * 512;
+ if (*fdlist < 0) {
+ pr_err("%s: cannot create backup file %s: %s\n",
+ devname, backup_file, strerror(errno));
+ return 0;
+ }
+ /* Guard against backup file being on array device.
+ * If array is partitioned or if LVM etc is in the
+ * way this will not notice, but it is better than
+ * nothing.
+ */
+ fstat(*fdlist, &stb);
+ dev = stb.st_dev;
+ fstat(fd, &stb);
+ if (stb.st_rdev == dev) {
+ pr_err("backup file must NOT be"
+ " on the array being reshaped.\n");
+ close(*fdlist);
+ return 0;
+ }
+
+ memset(buf, 0, 512);
+ for (i=0; i < blocks + 8 ; i++) {
+ if (write(*fdlist, buf, 512) != 512) {
+ pr_err("%s: cannot create"
+ " backup file %s: %s\n",
+ devname, backup_file, strerror(errno));
+ return 0;
+ }
+ }
+ if (fsync(*fdlist) != 0) {
+ pr_err("%s: cannot create backup file %s: %s\n",
+ devname, backup_file, strerror(errno));
+ return 0;
+ }
+
+ if (!restart && strncmp(backup_file, MAP_DIR, strlen(MAP_DIR)) != 0) {
+ char *bu = make_backup(sys_name);
+ if (symlink(backup_file, bu))
+ pr_err("Recording backup file in " MAP_DIR "failed: %s\n",
+ strerror(errno));
+ free(bu);
+ }
+
+ return 1;
+}
+
+unsigned long compute_backup_blocks(int nchunk, int ochunk,
+ unsigned int ndata, unsigned int odata)
+{
+ unsigned long a, b, blocks;
+ /* So how much do we need to backup.
+ * We need an amount of data which is both a whole number of
+ * old stripes and a whole number of new stripes.
+ * So LCM for (chunksize*datadisks).
+ */
+ a = (ochunk/512) * odata;
+ b = (nchunk/512) * ndata;
+ /* Find GCD */
+ a = GCD(a, b);
+ /* LCM == product / GCD */
+ blocks = (ochunk/512) * (nchunk/512) * odata * ndata / a;
+
+ return blocks;
+}
+
+char *analyse_change(char *devname, struct mdinfo *info, struct reshape *re)
+{
+ /* Based on the current array state in info->array and
+ * the changes in info->new_* etc, determine:
+ * - whether the change is possible
+ * - Intermediate level/raid_disks/layout
+ * - whether a restriping reshape is needed
+ * - number of sectors in minimum change unit. This
+ * will cover a whole number of stripes in 'before' and
+ * 'after'.
+ *
+ * Return message if the change should be rejected
+ * NULL if the change can be achieved
+ *
+ * This can be called as part of starting a reshape, or
+ * when assembling an array that is undergoing reshape.
+ */
+ int near, far, offset, copies;
+ int new_disks;
+ int old_chunk, new_chunk;
+ /* delta_parity records change in number of devices
+ * caused by level change
+ */
+ int delta_parity = 0;
+
+ memset(re, 0, sizeof(*re));
+
+ /* If a new level not explicitly given, we assume no-change */
+ if (info->new_level == UnSet)
+ info->new_level = info->array.level;
+
+ if (info->new_chunk)
+ switch (info->new_level) {
+ case 0:
+ case 4:
+ case 5:
+ case 6:
+ case 10:
+ /* chunk size is meaningful, must divide component_size
+ * evenly
+ */
+ if (info->component_size % (info->new_chunk/512)) {
+ unsigned long long shrink = info->component_size;
+ shrink &= ~(unsigned long long)(info->new_chunk/512-1);
+ pr_err("New chunk size (%dK) does not evenly divide device size (%lluk)\n",
+ info->new_chunk/1024, info->component_size/2);
+ pr_err("After shrinking any filesystem, \"mdadm --grow %s --size %llu\"\n",
+ devname, shrink/2);
+ pr_err("will shrink the array so the given chunk size would work.\n");
+ return "";
+ }
+ break;
+ default:
+ return "chunk size not meaningful for this level";
+ }
+ else
+ info->new_chunk = info->array.chunk_size;
+
+ switch (info->array.level) {
+ default:
+ return "No reshape is possibly for this RAID level";
+ case LEVEL_LINEAR:
+ if (info->delta_disks != UnSet)
+ return "Only --add is supported for LINEAR, setting --raid-disks is not needed";
+ else
+ return "Only --add is supported for LINEAR, other --grow options are not meaningful";
+ case 1:
+ /* RAID1 can convert to RAID1 with different disks, or
+ * 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)
+ return "Cannot change number of disks "
+ "with RAID1->RAID0 conversion";
+ re->level = 0;
+ re->before.data_disks = 1;
+ re->after.data_disks = 1;
+ return NULL;
+ }
+ if (info->new_level == 1) {
+ if (info->delta_disks == UnSet)
+ /* Don't know what to do */
+ return "no change requested for Growing RAID1";
+ re->level = 1;
+ return NULL;
+ }
+ if (info->array.raid_disks == 2 &&
+ info->new_level == 5) {
+
+ re->level = 5;
+ re->before.data_disks = 1;
+ if (info->delta_disks != UnSet &&
+ info->delta_disks != 0)
+ re->after.data_disks = 1 + info->delta_disks;
+ else
+ re->after.data_disks = 1;
+ if (re->after.data_disks < 1)
+ return "Number of disks too small for RAID5";
+
+ re->before.layout = ALGORITHM_LEFT_SYMMETRIC;
+ info->array.chunk_size = 65536;
+ break;
+ }
+ /* Could do some multi-stage conversions, but leave that to
+ * later.
+ */
+ return "Impossibly level change request for RAID1";
+
+ case 10:
+ /* RAID10 can be converted from near mode to
+ * RAID0 by removing some devices.
+ * It can also be reshaped if the kernel supports
+ * new_data_offset.
+ */
+ switch (info->new_level) {
+ case 0:
+ if ((info->array.layout & ~0xff) != 0x100)
+ return "Cannot Grow RAID10 with far/offset layout";
+ /* number of devices must be multiple of number of copies */
+ if (info->array.raid_disks % (info->array.layout & 0xff))
+ return "RAID10 layout too complex for Grow operation";
+
+ new_disks = (info->array.raid_disks
+ / (info->array.layout & 0xff));
+ if (info->delta_disks == UnSet)
+ info->delta_disks = (new_disks
+ - info->array.raid_disks);
+
+ if (info->delta_disks != new_disks - info->array.raid_disks)
+ return "New number of raid-devices impossible for RAID10";
+ if (info->new_chunk &&
+ info->new_chunk != info->array.chunk_size)
+ return "Cannot change chunk-size with RAID10 Grow";
+
+ /* looks good */
+ re->level = 0;
+ re->before.data_disks = new_disks;
+ re->after.data_disks = re->before.data_disks;
+ return NULL;
+
+ case 10:
+ near = info->array.layout & 0xff;
+ far = (info->array.layout >> 8) & 0xff;
+ offset = info->array.layout & 0x10000;
+ if (far > 1 && !offset)
+ return "Cannot reshape RAID10 in far-mode";
+ copies = near * far;
+
+ old_chunk = info->array.chunk_size * far;
+
+ if (info->new_layout == UnSet)
+ info->new_layout = info->array.layout;
+ else {
+ near = info->new_layout & 0xff;
+ far = (info->new_layout >> 8) & 0xff;
+ offset = info->new_layout & 0x10000;
+ if (far > 1 && !offset)
+ return "Cannot reshape RAID10 to far-mode";
+ if (near * far != copies)
+ return "Cannot change number of copies"
+ " when reshaping RAID10";
+ }
+ if (info->delta_disks == UnSet)
+ info->delta_disks = 0;
+ new_disks = (info->array.raid_disks +
+ info->delta_disks);
+
+ new_chunk = info->new_chunk * far;
+
+ re->level = 10;
+ re->before.layout = info->array.layout;
+ re->before.data_disks = info->array.raid_disks;
+ re->after.layout = info->new_layout;
+ re->after.data_disks = new_disks;
+ /* For RAID10 we don't do backup but do allow reshape,
+ * so set backup_blocks to INVALID_SECTORS rather than
+ * zero.
+ * And there is no need to synchronise stripes on both
+ * 'old' and 'new'. So the important
+ * number is the minimum data_offset difference
+ * which is the larger of (offset copies * chunk).
+ */
+ re->backup_blocks = INVALID_SECTORS;
+ re->min_offset_change = max(old_chunk, new_chunk) / 512;
+ if (new_disks < re->before.data_disks &&
+ info->space_after < re->min_offset_change)
+ /* Reduce component size by one chunk */
+ re->new_size = (info->component_size -
+ re->min_offset_change);
+ else
+ re->new_size = info->component_size;
+ re->new_size = re->new_size * new_disks / copies;
+ return NULL;
+
+ default:
+ return "RAID10 can only be changed to RAID0";
+ }
+ case 0:
+ /* RAID0 can be converted to RAID10, or to RAID456 */
+ if (info->new_level == 10) {
+ if (info->new_layout == UnSet && info->delta_disks == UnSet) {
+ /* Assume near=2 layout */
+ info->new_layout = 0x102;
+ info->delta_disks = info->array.raid_disks;
+ }
+ if (info->new_layout == UnSet) {
+ int copies = 1 + (info->delta_disks
+ / info->array.raid_disks);
+ if (info->array.raid_disks * (copies-1)
+ != info->delta_disks)
+ return "Impossible number of devices"
+ " for RAID0->RAID10";
+ info->new_layout = 0x100 + copies;
+ }
+ if (info->delta_disks == UnSet) {
+ int copies = info->new_layout & 0xff;
+ if (info->new_layout != 0x100 + copies)
+ return "New layout impossible"
+ " for RAID0->RAID10";;
+ info->delta_disks = (copies - 1) *
+ info->array.raid_disks;
+ }
+ if (info->new_chunk &&
+ info->new_chunk != info->array.chunk_size)
+ return "Cannot change chunk-size with RAID0->RAID10";
+ /* looks good */
+ re->level = 10;
+ re->before.data_disks = (info->array.raid_disks +
+ info->delta_disks);
+ re->after.data_disks = re->before.data_disks;
+ re->before.layout = info->new_layout;
+ return NULL;
+ }
+
+ /* RAID0 can also covert to RAID0/4/5/6 by first converting to
+ * a raid4 style layout of the final level.
+ */
+ switch (info->new_level) {
+ case 4:
+ delta_parity = 1;
+ case 0:
+ re->level = 4;
+ re->before.layout = 0;
+ break;
+ case 5:
+ delta_parity = 1;
+ re->level = 5;
+ re->before.layout = ALGORITHM_PARITY_N;
+ if (info->new_layout == UnSet)
+ info->new_layout = map_name(r5layout, "default");
+ break;
+ case 6:
+ delta_parity = 2;
+ re->level = 6;
+ re->before.layout = ALGORITHM_PARITY_N;
+ if (info->new_layout == UnSet)
+ info->new_layout = map_name(r6layout, "default");
+ break;
+ default:
+ return "Impossible level change requested";
+ }
+ re->before.data_disks = info->array.raid_disks;
+ /* determining 'after' layout happens outside this 'switch' */
+ break;
+
+ case 4:
+ info->array.layout = ALGORITHM_PARITY_N;
+ case 5:
+ switch (info->new_level) {
+ case 0:
+ delta_parity = -1;
+ case 4:
+ re->level = info->array.level;
+ re->before.data_disks = info->array.raid_disks - 1;
+ re->before.layout = info->array.layout;
+ break;
+ case 5:
+ re->level = 5;
+ re->before.data_disks = info->array.raid_disks - 1;
+ re->before.layout = info->array.layout;
+ break;
+ case 6:
+ delta_parity = 1;
+ re->level = 6;
+ re->before.data_disks = info->array.raid_disks - 1;
+ switch (info->array.layout) {
+ case ALGORITHM_LEFT_ASYMMETRIC:
+ re->before.layout = ALGORITHM_LEFT_ASYMMETRIC_6;
+ break;
+ case ALGORITHM_RIGHT_ASYMMETRIC:
+ re->before.layout = ALGORITHM_RIGHT_ASYMMETRIC_6;
+ break;
+ case ALGORITHM_LEFT_SYMMETRIC:
+ re->before.layout = ALGORITHM_LEFT_SYMMETRIC_6;
+ break;
+ case ALGORITHM_RIGHT_SYMMETRIC:
+ re->before.layout = ALGORITHM_RIGHT_SYMMETRIC_6;
+ break;
+ case ALGORITHM_PARITY_0:
+ re->before.layout = ALGORITHM_PARITY_0_6;
+ break;
+ case ALGORITHM_PARITY_N:
+ re->before.layout = ALGORITHM_PARITY_N_6;
+ break;
+ default:
+ return "Cannot convert an array with this layout";
+ }
+ break;
+ case 1:
+ if (info->array.raid_disks != 2)
+ return "Can only convert a 2-device array to RAID1";
+ if (info->delta_disks != UnSet &&
+ info->delta_disks != 0)
+ return "Cannot set raid_disk when "
+ "converting RAID5->RAID1";
+ re->level = 1;
+ info->new_chunk = 0;
+ return NULL;
+ default:
+ return "Impossible level change requested";
+ }
+ break;
+ case 6:
+ switch (info->new_level) {
+ case 4:
+ case 5:
+ delta_parity = -1;
+ case 6:
+ re->level = 6;
+ re->before.data_disks = info->array.raid_disks - 2;
+ re->before.layout = info->array.layout;
+ break;
+ default:
+ return "Impossible level change requested";
+ }
+ break;
+ }
+
+ /* If we reached here then it looks like a re-stripe is
+ * happening. We have determined the intermediate level
+ * and initial raid_disks/layout and stored these in 're'.
+ *
+ * We need to deduce the final layout that can be atomically
+ * converted to the end state.
+ */
+ switch (info->new_level) {
+ case 0:
+ /* We can only get to RAID0 from RAID4 or RAID5
+ * with appropriate layout and one extra device
+ */
+ if (re->level != 4 && re->level != 5)
+ return "Cannot covert to RAID0 from this level";
+
+ switch (re->level) {
+ case 4:
+ re->before.layout = 0;
+ re->after.layout = 0;
+ break;
+ case 5:
+ re->after.layout = ALGORITHM_PARITY_N;
+ break;
+ }
+ break;
+
+ case 4:
+ /* We can only get to RAID4 from RAID5 */
+ if (re->level != 4 && re->level != 5)
+ return "Cannot convert to RAID4 from this level";
+
+ switch (re->level) {
+ case 4:
+ re->after.layout = 0;
+ break;
+ case 5:
+ re->after.layout = ALGORITHM_PARITY_N;
+ break;
+ }
+ break;
+
+ case 5:
+ /* We get to RAID5 from RAID5 or RAID6 */
+ if (re->level != 5 && re->level != 6)
+ return "Cannot convert to RAID5 from this level";
+
+ switch (re->level) {
+ case 5:
+ if (info->new_layout == UnSet)
+ re->after.layout = re->before.layout;
+ else
+ re->after.layout = info->new_layout;
+ break;
+ case 6:
+ if (info->new_layout == UnSet)
+ info->new_layout = re->before.layout;
+
+ /* after.layout needs to be raid6 version of new_layout */
+ if (info->new_layout == ALGORITHM_PARITY_N)
+ re->after.layout = ALGORITHM_PARITY_N;
+ else {
+ char layout[40];
+ char *ls = map_num(r5layout, info->new_layout);
+ int l;
+ 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;
+ }
+ }
+ break;
+
+ case 6:
+ /* We must already be at level 6 */
+ if (re->level != 6)
+ return "Impossible level change";
+ if (info->new_layout == UnSet)
+ re->after.layout = info->array.layout;
+ else
+ re->after.layout = info->new_layout;
+ break;
+ default:
+ return "Impossible level change requested";
+ }
+ if (info->delta_disks == UnSet)
+ info->delta_disks = delta_parity;
+
+ re->after.data_disks = (re->before.data_disks
+ + info->delta_disks
+ - delta_parity);
+ switch (re->level) {
+ case 6: re->parity = 2;
+ break;
+ case 4:
+ case 5: re->parity = 1;
+ break;
+ default: re->parity = 0;
+ break;
+ }
+ /* So we have a restripe operation, we need to calculate the number
+ * of blocks per reshape operation.
+ */
+ re->new_size = info->component_size * re->before.data_disks;
+ if (info->new_chunk == 0)
+ info->new_chunk = info->array.chunk_size;
+ if (re->after.data_disks == re->before.data_disks &&
+ re->after.layout == re->before.layout &&
+ info->new_chunk == info->array.chunk_size) {
+ /* Nothing to change, can change level immediately. */
+ re->level = info->new_level;
+ re->backup_blocks = 0;
+ return NULL;
+ }
+ if (re->after.data_disks == 1 && re->before.data_disks == 1) {
+ /* chunk and layout changes make no difference */
+ re->level = info->new_level;
+ re->backup_blocks = 0;
+ return NULL;
+ }
+
+ if (re->after.data_disks == re->before.data_disks &&
+ get_linux_version() < 2006032)
+ return "in-place reshape is not safe before 2.6.32 - sorry.";
+
+ if (re->after.data_disks < re->before.data_disks &&
+ get_linux_version() < 2006030)
+ return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
+
+ re->backup_blocks = compute_backup_blocks(
+ info->new_chunk, info->array.chunk_size,
+ re->after.data_disks,
+ re->before.data_disks);
+ re->min_offset_change = re->backup_blocks / re->before.data_disks;
+
+ re->new_size = info->component_size * re->after.data_disks;
+ 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,
+ unsigned long long data_offset,
+ char *backup_file, int verbose, int forked,
+ int restart, int freeze_reshape);
+static int reshape_container(char *container, char *devname,
+ int mdfd,
+ struct supertype *st,
+ struct mdinfo *info,
+ int force,
+ char *backup_file, int verbose,
+ int forked, int restart, int freeze_reshape);
+
+int Grow_reshape(char *devname, int fd,
+ struct mddev_dev *devlist,
+ unsigned long long data_offset,
+ struct context *c, struct shape *s)
+{
+ /* Make some changes in the shape of an array.
+ * The kernel must support the change.
+ *
+ * There are three different changes. Each can trigger
+ * a resync or recovery so we freeze that until we have
+ * requested everything (if kernel supports freezing - 2.6.30).
+ * The steps are:
+ * - change size (i.e. component_size)
+ * - change level
+ * - change layout/chunksize/ndisks
+ *
+ * The last can require a reshape. It is different on different
+ * levels so we need to check the level before actioning it.
+ * Some times the level change needs to be requested after the
+ * reshape (e.g. raid6->raid5, raid5->raid0)
+ *
+ */
+ struct mdu_array_info_s array;
+ int rv = 0;
+ struct supertype *st;
+ char *subarray = NULL;
+
+ int frozen;
+ int changed = 0;
+ char *container = NULL;
+ int cfd = -1;
+
+ struct mddev_dev *dv;
+ int added_disks;
+
+ struct mdinfo info;
+ struct mdinfo *sra;
+
+ if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
+ pr_err("%s is not an active md array - aborting\n",
+ devname);
+ return 1;
+ }
+ if (data_offset != INVALID_SECTORS && array.level != 10
+ && (array.level < 4 || array.level > 6)) {
+ pr_err("--grow --data-offset not yet supported\n");
+ return 1;
+ }
+
+ if (s->size > 0 &&
+ (s->chunk || s->level!= UnSet || s->layout_str || s->raiddisks)) {
+ 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");
+ return 1;
+ }
+
+ if (s->raiddisks && s->raiddisks < array.raid_disks && array.level > 1 &&
+ get_linux_version() < 2006032 &&
+ !check_env("MDADM_FORCE_FEWER")) {
+ 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) {
+ pr_err("Unable to determine metadata format for %s\n", devname);
+ return 1;
+ }
+ if (s->raiddisks > st->max_devs) {
+ pr_err("Cannot increase raid-disks on this array"
+ " beyond %d\n", st->max_devs);
+ return 1;
+ }
+
+ /* in the external case we need to check that the requested reshape is
+ * supported, and perform an initial check that the container holds the
+ * pre-requisite spare devices (mdmon owns final validation)
+ */
+ if (st->ss->external) {
+ int rv;
+
+ if (subarray) {
+ container = st->container_devnm;
+ cfd = open_dev_excl(st->container_devnm);
+ } else {
+ container = st->devnm;
+ close(fd);
+ cfd = open_dev_excl(st->devnm);
+ fd = cfd;
+ }
+ if (cfd < 0) {
+ pr_err("Unable to open container for %s\n",
+ devname);
+ free(subarray);
+ return 1;
+ }
+
+ rv = st->ss->load_container(st, cfd, NULL);
+
+ if (rv) {
+ pr_err("Cannot read superblock for %s\n",
+ devname);
+ free(subarray);
+ return 1;
+ }
+
+ /* check if operation is supported for metadata handler */
+ if (st->ss->container_content) {
+ struct mdinfo *cc = NULL;
+ struct mdinfo *content = NULL;
+
+ cc = st->ss->container_content(st, subarray);
+ for (content = cc; content ; content = content->next) {
+ int allow_reshape = 1;
+
+ /* check if reshape is allowed based on metadata
+ * indications stored in content.array.status
+ */
+ if (content->array.state & (1<<MD_SB_BLOCK_VOLUME))
+ allow_reshape = 0;
+ if (content->array.state
+ & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE))
+ allow_reshape = 0;
+ if (!allow_reshape) {
+ pr_err("cannot reshape arrays in"
+ " container with unsupported"
+ " metadata: %s(%s)\n",
+ devname, container);
+ sysfs_free(cc);
+ free(subarray);
+ return 1;
+ }
+ }
+ sysfs_free(cc);
+ }
+ if (mdmon_running(container))
+ st->update_tail = &st->updates;
+ }
+
+ added_disks = 0;
+ for (dv = devlist; dv; dv = dv->next)
+ added_disks++;
+ if (s->raiddisks > array.raid_disks &&
+ array.spare_disks +added_disks < (s->raiddisks - array.raid_disks) &&
+ !c->force) {
+ pr_err("Need %d spare%s to avoid degraded array,"
+ " and only have %d.\n"
+ " Use --force to over-ride this check.\n",
+ s->raiddisks - array.raid_disks,
+ s->raiddisks - array.raid_disks == 1 ? "" : "s",
+ array.spare_disks + added_disks);
+ return 1;
+ }
+
+ sra = sysfs_read(fd, NULL, GET_LEVEL | GET_DISKS | GET_DEVS
+ | GET_STATE | GET_VERSION);
+ if (sra) {
+ if (st->ss->external && subarray == NULL) {
+ array.level = LEVEL_CONTAINER;
+ sra->array.level = LEVEL_CONTAINER;
+ }
+ } else {
+ pr_err("failed to read sysfs parameters for %s\n",
+ devname);
+ return 1;
+ }
+ frozen = freeze(st);
+ if (frozen < -1) {
+ /* freeze() already spewed the reason */
+ sysfs_free(sra);
+ return 1;
+ } else if (frozen < 0) {
+ pr_err("%s is performing resync/recovery and cannot"
+ " be reshaped\n", devname);
+ sysfs_free(sra);
+ return 1;
+ }
+
+ /* ========= set size =============== */
+ if (s->size > 0 && (s->size == MAX_SIZE || s->size != (unsigned)array.size)) {
+ unsigned long long orig_size = get_component_size(fd)/2;
+ unsigned long long min_csize;
+ struct mdinfo *mdi;
+ int raid0_takeover = 0;
+
+ if (orig_size == 0)
+ orig_size = (unsigned) array.size;
+
+ if (orig_size == 0) {
+ pr_err("Cannot set device size in this type of array.\n");
+ rv = 1;
+ goto release;
+ }
+
+ if (reshape_super(st, s->size, UnSet, UnSet, 0, 0, UnSet, NULL,
+ devname, APPLY_METADATA_CHANGES, c->verbose > 0)) {
+ 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);
+ s->size = new_size;
+ sysfs_free(sizeinfo);
+ }
+ }
+
+ /* Update the size of each member device in case
+ * they have been resized. This will never reduce
+ * below the current used-size. The "size" attribute
+ * 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",
+ s->size == MAX_SIZE ? 0 : s->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) {
+ /* Dangerous to allow size to exceed 2TB */
+ unsigned long long csize;
+ if (sysfs_get_ll(sra, mdi, "size", &csize) == 0) {
+ if (csize >= 2ULL*1024*1024*1024)
+ csize = 2ULL*1024*1024*1024;
+ if ((min_csize == 0 || (min_csize
+ > csize)))
+ min_csize = csize;
+ }
+ }
+ }
+ if (rv) {
+ pr_err("Cannot set size on "
+ "array members.\n");
+ goto size_change_error;
+ }
+ if (min_csize && s->size > min_csize) {
+ pr_err("Cannot safely make this array "
+ "use more than 2TB per device on this kernel.\n");
+ rv = 1;
+ goto size_change_error;
+ }
+ if (min_csize && s->size == MAX_SIZE) {
+ /* Don't let the kernel choose a size - it will get
+ * it wrong
+ */
+ pr_err("Limited v0.90 array to "
+ "2TB per device\n");
+ s->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_devnm))
+ start_mdmon(st->container_devnm);
+ ping_monitor(container);
+ if (mdmon_running(st->container_devnm) &&
+ st->update_tail == NULL)
+ st->update_tail = &st->updates;
+ }
+
+ if (s->size == MAX_SIZE)
+ s->size = 0;
+ array.size = s->size;
+ if (array.size != (signed)s->size) {
+ /* got truncated to 32bit, write to
+ * component_size instead
+ */
+ if (sra)
+ rv = sysfs_set_num(sra, NULL,
+ "component_size", s->size);
+ else
+ rv = -1;
+ } 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,
+ ROLLBACK_METADATA_CHANGES,
+ c->verbose) == 0)
+ sync_metadata(st);
+ pr_err("Cannot set device size for %s: %s\n",
+ devname, strerror(err));
+ if (err == EBUSY &&
+ (array.state & (1<<MD_SB_BITMAP_PRESENT)))
+ cont_err("Bitmap must be removed before size can be changed\n");
+ rv = 1;
+ goto release;
+ }
+ if (s->assume_clean) {
+ /* This will fail on kernels older than 3.0 unless
+ * a backport has been arranged.
+ */
+ if (sra == NULL ||
+ sysfs_set_str(sra, NULL, "resync_start", "none") < 0)
+ pr_err("--assume-clean not supported with --grow on this kernel\n");
+ }
+ ioctl(fd, GET_ARRAY_INFO, &array);
+ s->size = get_component_size(fd)/2;
+ if (s->size == 0)
+ s->size = array.size;
+ if (c->verbose >= 0) {
+ if (s->size == orig_size)
+ pr_err("component size of %s "
+ "unchanged at %lluK\n",
+ devname, s->size);
+ else
+ pr_err("component size of %s "
+ "has been set to %lluK\n",
+ devname, s->size);
+ }
+ changed = 1;
+ } else if (array.level != LEVEL_CONTAINER) {
+ s->size = get_component_size(fd)/2;
+ if (s->size == 0)
+ s->size = array.size;
+ }
+
+ /* See if there is anything else to do */
+ if ((s->level == UnSet || s->level == array.level) &&
+ (s->layout_str == NULL) &&
+ (s->chunk == 0 || s->chunk == array.chunk_size) &&
+ data_offset == INVALID_SECTORS &&
+ (s->raiddisks == 0 || s->raiddisks == array.raid_disks)) {
+ /* Nothing more to do */
+ if (!changed && c->verbose >= 0)
+ pr_err("%s: no change requested\n",
+ devname);
+ goto release;
+ }
+
+ /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
+ * current implementation assumes that following conditions must be met:
+ * - RAID10:
+ * - far_copies == 1
+ * - near_copies == 2
+ */
+ if ((s->level == 0 && array.level == 10 && sra &&
+ array.layout == ((1 << 8) + 2) && !(array.raid_disks & 1)) ||
+ (s->level == 0 && array.level == 1 && sra)) {
+ int err;
+ err = remove_disks_for_takeover(st, sra, array.layout);
+ if (err) {
+ dprintf(Name": Array cannot be reshaped\n");
+ if (cfd > -1)
+ close(cfd);
+ rv = 1;
+ goto release;
+ }
+ /* Make sure mdmon has seen the device removal
+ * and updated metadata before we continue with
+ * level change
+ */
+ if (container)
+ ping_monitor(container);
+ }
+
+ memset(&info, 0, sizeof(info));
+ info.array = array;
+ sysfs_init(&info, fd, NULL);
+ strcpy(info.text_version, sra->text_version);
+ info.component_size = s->size*2;
+ info.new_level = s->level;
+ info.new_chunk = s->chunk * 1024;
+ if (info.array.level == LEVEL_CONTAINER) {
+ info.delta_disks = UnSet;
+ info.array.raid_disks = s->raiddisks;
+ } else if (s->raiddisks)
+ info.delta_disks = s->raiddisks - info.array.raid_disks;
+ else
+ info.delta_disks = UnSet;
+ if (s->layout_str == NULL) {
+ info.new_layout = UnSet;
+ if (info.array.level == 6 &&
+ (info.new_level == 6 || info.new_level == UnSet) &&
+ info.array.layout >= 16) {
+ 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;
+ }
+ } else if (strcmp(s->layout_str, "normalise") == 0 ||
+ strcmp(s->layout_str, "normalize") == 0) {
+ /* If we have a -6 RAID6 layout, remove the '-6'. */
+ info.new_layout = UnSet;
+ if (info.array.level == 6 && info.new_level == UnSet) {
+ char l[40], *h;
+ strcpy(l, map_num(r6layout, info.array.layout));
+ h = strrchr(l, '-');
+ if (h && strcmp(h, "-6") == 0) {
+ *h = 0;
+ info.new_layout = map_name(r6layout, l);
+ }
+ } else {
+ pr_err("%s is only meaningful when reshaping"
+ " a RAID6 array.\n", s->layout_str);
+ rv = 1;
+ goto release;
+ }
+ } else if (strcmp(s->layout_str, "preserve") == 0) {
+ /* 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", s->layout_str);
+ rv = 1;
+ goto release;
+ }
+ } else {
+ int l = info.new_level;
+ if (l == UnSet)
+ l = info.array.level;
+ switch (l) {
+ case 5:
+ info.new_layout = map_name(r5layout, s->layout_str);
+ break;
+ case 6:
+ info.new_layout = map_name(r6layout, s->layout_str);
+ break;
+ case 10:
+ info.new_layout = parse_layout_10(s->layout_str);
+ break;
+ case LEVEL_FAULTY:
+ info.new_layout = parse_layout_faulty(s->layout_str);
+ break;
+ default:
+ pr_err("layout not meaningful"
+ " with this level\n");
+ rv = 1;
+ goto release;
+ }
+ if (info.new_layout == UnSet) {
+ pr_err("layout %s not understood"
+ " for this level\n",
+ s->layout_str);
+ rv = 1;
+ goto release;
+ }
+ }
+
+ if (array.level == LEVEL_FAULTY) {
+ if (s->level != UnSet && s->level != array.level) {
+ pr_err("cannot change level of Faulty device\n");
+ rv =1 ;
+ }
+ if (s->chunk) {
+ pr_err("cannot set chunksize of Faulty device\n");
+ rv =1 ;
+ }
+ if (s->raiddisks && s->raiddisks != 1) {
+ pr_err("cannot set raid_disks of Faulty device\n");
+ rv =1 ;
+ }
+ if (s->layout_str) {
+ if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
+ dprintf("Cannot get array information.\n");
+ goto release;
+ }
+ array.layout = info.new_layout;
+ if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
+ pr_err("failed to set new layout\n");
+ rv = 1;
+ } else if (c->verbose >= 0)
+ printf("layout for %s set to %d\n",
+ devname, array.layout);
+ }
+ } else if (array.level == LEVEL_CONTAINER) {
+ /* This change is to be applied to every array in the
+ * container. This is only needed when the metadata imposes
+ * restraints of the various arrays in the container.
+ * Currently we only know that IMSM requires all arrays
+ * to have the same number of devices so changing the
+ * number of devices (On-Line Capacity Expansion) must be
+ * performed at the level of the container
+ */
+ rv = reshape_container(container, devname, -1, st, &info,
+ c->force, c->backup_file, c->verbose, 0, 0, 0);
+ frozen = 0;
+ } else {
+ /* get spare devices from external metadata
+ */
+ if (st->ss->external) {
+ struct mdinfo *info2;
+
+ info2 = st->ss->container_content(st, subarray);
+ if (info2) {
+ info.array.spare_disks =
+ info2->array.spare_disks;
+ sysfs_free(info2);
+ }
+ }
+
+ /* Impose these changes on a single array. First
+ * check that the metadata is OK with the change. */
+
+ if (reshape_super(st, 0, info.new_level,
+ info.new_layout, info.new_chunk,
+ info.array.raid_disks, info.delta_disks,
+ c->backup_file, devname, APPLY_METADATA_CHANGES,
+ c->verbose)) {
+ rv = 1;
+ goto release;
+ }
+ sync_metadata(st);
+ rv = reshape_array(container, fd, devname, st, &info, c->force,
+ devlist, data_offset, c->backup_file, c->verbose,
+ 0, 0, 0);
+ frozen = 0;
+ }
+release:
+ sysfs_free(sra);
+ if (frozen > 0)
+ unfreeze(st);
+ 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 unsigned long long choose_offset(unsigned long long lo,
+ unsigned long long hi,
+ unsigned long long min,
+ unsigned long long max)
+{
+ /* Choose a new offset between hi and lo.
+ * It must be between min and max, but
+ * we would prefer something near the middle of hi/lo, and also
+ * prefer to be aligned to a big power of 2.
+ *
+ * So we start with the middle, then for each bit,
+ * starting at '1' and increasing, if it is set, we either
+ * add it or subtract it if possible, preferring the option
+ * which is furthest from the boundary.
+ *
+ * We stop once we get a 1MB alignment. As units are in sectors,
+ * 1MB = 2*1024 sectors.
+ */
+ unsigned long long choice = (lo + hi) / 2;
+ unsigned long long bit = 1;
+
+ for (bit = 1; bit < 2*1024; bit = bit << 1) {
+ unsigned long long bigger, smaller;
+ if (! (bit & choice))
+ continue;
+ bigger = choice + bit;
+ smaller = choice - bit;
+ if (bigger > max && smaller < min)
+ break;
+ if (bigger > max)
+ choice = smaller;
+ else if (smaller < min)
+ choice = bigger;
+ else if (hi - bigger > smaller - lo)
+ choice = bigger;
+ else
+ choice = smaller;
+ }
+ return choice;
+}
+
+static int set_new_data_offset(struct mdinfo *sra, struct supertype *st,
+ char *devname, int delta_disks,
+ unsigned long long data_offset,
+ unsigned long long min,
+ int can_fallback)
+{
+ struct mdinfo *sd;
+ int dir = 0;
+ int err = 0;
+ unsigned long long before, after;
+
+ /* Need to find min space before and after so same is used
+ * on all devices
+ */
+ before = UINT64_MAX;
+ after = UINT64_MAX;
+ for (sd = sra->devs; sd; sd = sd->next) {
+ char *dn;
+ int dfd;
+ int rv;
+ struct supertype *st2;
+ struct mdinfo info2;
+
+ if (sd->disk.state & (1<<MD_DISK_FAULTY))
+ continue;
+ dn = map_dev(sd->disk.major, sd->disk.minor, 0);
+ dfd = dev_open(dn, O_RDONLY);
+ if (dfd < 0) {
+ pr_err("%s: cannot open component %s\n",
+ devname, dn ? dn : "-unknown-");
+ goto release;
+ }
+ st2 = dup_super(st);
+ rv = st2->ss->load_super(st2,dfd, NULL);
+ close(dfd);
+ if (rv) {
+ free(st2);
+ pr_err("%s: cannot get superblock from %s\n",
+ devname, dn);
+ goto release;
+ }
+ st2->ss->getinfo_super(st2, &info2, NULL);
+ st2->ss->free_super(st2);
+ free(st2);
+ if (info2.space_before == 0 &&
+ info2.space_after == 0) {
+ /* Metadata doesn't support data_offset changes */
+ return 1;
+ }
+ if (before > info2.space_before)
+ before = info2.space_before;
+ if (after > info2.space_after)
+ after = info2.space_after;
+
+ if (data_offset != INVALID_SECTORS) {
+ if (dir == 0) {
+ if (info2.data_offset == data_offset) {
+ pr_err("%s: already has that data_offset\n",
+ dn);
+ goto release;
+ }
+ if (data_offset < info2.data_offset)
+ dir = -1;
+ else
+ dir = 1;
+ } else if ((data_offset <= info2.data_offset && dir == 1) ||
+ (data_offset >= info2.data_offset && dir == -1)) {
+ pr_err("%s: differing data offsets on devices make this --data-offset setting impossible\n",
+ dn);
+ goto release;
+ }
+ }
+ }
+ if (before == UINT64_MAX)
+ /* impossible really, there must be no devices */
+ return 1;
+
+ for (sd = sra->devs; sd; sd = sd->next) {
+ char *dn = map_dev(sd->disk.major, sd->disk.minor, 0);
+ unsigned long long new_data_offset;
+
+ if (sd->disk.state & (1<<MD_DISK_FAULTY))
+ continue;
+ if (delta_disks < 0) {
+ /* Don't need any space as array is shrinking
+ * just move data_offset up by min
+ */
+ if (data_offset == INVALID_SECTORS)
+ new_data_offset = sd->data_offset + min;
+ else {
+ if (data_offset < sd->data_offset + min) {
+ pr_err("--data-offset too small for %s\n",
+ dn);
+ goto release;
+ }
+ new_data_offset = data_offset;
+ }
+ } else if (delta_disks > 0) {
+ /* need space before */
+ if (before < min) {
+ if (can_fallback)
+ goto fallback;
+ pr_err("Insufficient head-space for reshape on %s\n",
+ dn);
+ goto release;
+ }
+ if (data_offset == INVALID_SECTORS)
+ new_data_offset = sd->data_offset - min;
+ else {
+ if (data_offset > sd->data_offset - min) {
+ pr_err("--data-offset too large for %s\n",
+ dn);
+ goto release;
+ }
+ new_data_offset = data_offset;
+ }
+ } else {
+ if (dir == 0) {
+ /* can move up or down. If 'data_offset'
+ * was set we would have already decided,
+ * so just choose direction with most space.
+ */
+ if (before > after)
+ dir = -1;
+ else
+ dir = 1;
+ }
+ sysfs_set_str(sra, NULL, "reshape_direction",
+ dir == 1 ? "backwards" : "forwards");
+ if (dir > 0) {
+ /* Increase data offset */
+ if (after < min) {
+ if (can_fallback)
+ goto fallback;
+ pr_err("Insufficient tail-space for reshape on %s\n",
+ dn);
+ goto release;
+ }
+ if (data_offset != INVALID_SECTORS &&
+ data_offset < sd->data_offset + min) {
+ pr_err("--data-offset too small on %s\n",
+ dn);
+ goto release;
+ }
+ if (data_offset != INVALID_SECTORS)
+ new_data_offset = data_offset;
+ else
+ new_data_offset = choose_offset(sd->data_offset,
+ sd->data_offset + after,
+ sd->data_offset + min,
+ sd->data_offset + after);
+ } else {
+ /* Decrease data offset */
+ if (before < min) {
+ if (can_fallback)
+ goto fallback;
+ pr_err("insufficient head-room on %s\n",
+ dn);
+ goto release;
+ }
+ if (data_offset != INVALID_SECTORS &&
+ data_offset < sd->data_offset - min) {
+ pr_err("--data-offset too small on %s\n",
+ dn);
+ goto release;
+ }
+ if (data_offset != INVALID_SECTORS)
+ new_data_offset = data_offset;
+ else
+ new_data_offset = choose_offset(sd->data_offset - before,
+ sd->data_offset,
+ sd->data_offset - before,
+ sd->data_offset - min);
+ }
+ }
+ err = sysfs_set_num(sra, sd, "new_offset", new_data_offset);
+ if (err < 0 && errno == E2BIG) {
+ /* try again after increasing data size to max */
+ err = sysfs_set_num(sra, sd, "size", 0);
+ if (err < 0 && errno == EINVAL &&
+ !(sd->disk.state & (1<<MD_DISK_SYNC))) {
+ /* some kernels have a bug where you cannot
+ * use '0' on spare devices. */
+ sysfs_set_num(sra, sd, "size",
+ (sra->component_size + after)/2);
+ }
+ err = sysfs_set_num(sra, sd, "new_offset",
+ new_data_offset);
+ }
+ if (err < 0) {
+ if (errno == E2BIG && data_offset != INVALID_SECTORS) {
+ pr_err("data-offset is too big for %s\n",
+ dn);
+ goto release;
+ }
+ if (sd == sra->devs &&
+ (errno == ENOENT || errno == E2BIG))
+ /* Early kernel, no 'new_offset' file,
+ * or kernel doesn't like us.
+ * For RAID5/6 this is not fatal
+ */
+ return 1;
+ pr_err("Cannot set new_offset for %s\n",
+ dn);
+ break;
+ }
+ }
+ return err;
+release:
+ return -1;
+fallback:
+ /* Just use a backup file */
+ return 1;
+}
+
+static int raid10_reshape(char *container, int fd, char *devname,
+ struct supertype *st, struct mdinfo *info,
+ struct reshape *reshape,
+ unsigned long long data_offset,
+ int force, int verbose)
+{
+ /* Changing raid_disks, layout, chunksize or possibly
+ * just data_offset for a RAID10.
+ * We must always change data_offset. We change by at least
+ * ->min_offset_change which is the largest of the old and new
+ * chunk sizes.
+ * If raid_disks is increasing, then data_offset must decrease
+ * by at least this copy size.
+ * If raid_disks is unchanged, data_offset must increase or
+ * decrease by at least min_offset_change but preferably by much more.
+ * We choose half of the available space.
+ * If raid_disks is decreasing, data_offset must increase by
+ * at least min_offset_change. To allow of this, component_size
+ * must be decreased by the same amount.
+ *
+ * So we calculate the required minimum and direction, possibly
+ * reduce the component_size, then iterate through the devices
+ * and set the new_data_offset.
+ * If that all works, we set chunk_size, layout, raid_disks, and start
+ * 'reshape'
+ */
+ struct mdinfo *sra;
+ unsigned long long min;
+ int err = 0;
+
+ sra = sysfs_read(fd, NULL,
+ GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|GET_CHUNK
+ );
+ if (!sra) {
+ pr_err("%s: Cannot get array details from sysfs\n",
+ devname);
+ goto release;
+ }
+ min = reshape->min_offset_change;
+
+ if (info->delta_disks)
+ sysfs_set_str(sra, NULL, "reshape_direction",
+ info->delta_disks < 0 ? "backwards" : "forwards");
+ if (info->delta_disks < 0 &&
+ info->space_after < min) {
+ int rv = sysfs_set_num(sra, NULL, "component_size",
+ (sra->component_size -
+ min)/2);
+ if (rv) {
+ pr_err("cannot reduce component size\n");
+ goto release;
+ }
+ }
+ err = set_new_data_offset(sra, st, devname, info->delta_disks, data_offset,
+ min, 0);
+ if (err == 1) {
+ pr_err("Cannot set new_data_offset: RAID10 reshape not\n");
+ cont_err("supported on this kernel\n");
+ err = -1;
+ }
+ if (err < 0)
+ goto release;
+
+ if (!err && sysfs_set_num(sra, NULL, "chunk_size", info->new_chunk) < 0)
+ err = errno;
+ if (!err && sysfs_set_num(sra, NULL, "layout", reshape->after.layout) < 0)
+ err = errno;
+ if (!err && sysfs_set_num(sra, NULL, "raid_disks",
+ info->array.raid_disks + info->delta_disks) < 0)
+ err = errno;
+ if (!err && sysfs_set_str(sra, NULL, "sync_action", "reshape") < 0)
+ err = errno;
+ if (err) {
+ pr_err("Cannot set array shape for %s\n",
+ devname);
+ if (err == EBUSY &&
+ (info->array.state & (1<<MD_SB_BITMAP_PRESENT)))
+ cont_err(" Bitmap must be removed before"
+ " shape can be changed\n");
+ goto release;
+ }
+ sysfs_free(sra);
+ return 0;
+release:
+ sysfs_free(sra);
+ return 1;
+}
+
+static void get_space_after(int fd, struct supertype *st, struct mdinfo *info)
+{
+ struct mdinfo *sra, *sd;
+ /* Initialisation to silence compiler warning */
+ unsigned long long min_space_before = 0, min_space_after = 0;
+ int first = 1;
+
+ sra = sysfs_read(fd, NULL, GET_DEVS);
+ if (!sra)
+ return;
+ for (sd = sra->devs; sd; sd = sd->next) {
+ char *dn;
+ int dfd;
+ struct supertype *st2;
+ struct mdinfo info2;
+
+ if (sd->disk.state & (1<<MD_DISK_FAULTY))
+ continue;
+ dn = map_dev(sd->disk.major, sd->disk.minor, 0);
+ dfd = dev_open(dn, O_RDONLY);
+ if (dfd < 0)
+ break;
+ st2 = dup_super(st);
+ if (st2->ss->load_super(st2,dfd, NULL)) {
+ close(dfd);
+ free(st2);
+ break;
+ }
+ close(dfd);
+ st2->ss->getinfo_super(st2, &info2, NULL);
+ st2->ss->free_super(st2);
+ free(st2);
+ if (first ||
+ min_space_before > info2.space_before)
+ min_space_before = info2.space_before;
+ if (first ||
+ min_space_after > info2.space_after)
+ min_space_after = info2.space_after;
+ first = 0;
+ }
+ if (sd == NULL && !first) {
+ info->space_after = min_space_after;
+ info->space_before = min_space_before;
+ }
+ sysfs_free(sra);
+}
+
+static void update_cache_size(char *container, struct mdinfo *sra,
+ struct mdinfo *info,
+ int disks, unsigned long long blocks)
+{
+ /* Check that the internal stripe cache is
+ * large enough, or it won't work.
+ * It must hold at least 4 stripes of the larger
+ * chunk size
+ */
+ unsigned long cache;
+ cache = max(info->array.chunk_size, info->new_chunk);
+ cache *= 4; /* 4 stripes minimum */
+ cache /= 512; /* convert to sectors */
+ /* make sure there is room for 'blocks' with a bit to spare */
+ if (cache < 16 + blocks / disks)
+ cache = 16 + blocks / disks;
+ cache /= (4096/512); /* Covert from sectors to pages */
+
+ if (sra->cache_size < cache)
+ subarray_set_num(container, sra, "stripe_cache_size",
+ cache+1);
+}
+
+static int impose_reshape(struct mdinfo *sra,
+ struct mdinfo *info,
+ struct supertype *st,
+ int fd,
+ int restart,
+ char *devname, char *container,
+ struct reshape *reshape)
+{
+ struct mdu_array_info_s array;
+
+ sra->new_chunk = info->new_chunk;
+
+ 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 {
+ sra->reshape_progress = 0;
+ if (reshape->after.data_disks < reshape->before.data_disks)
+ /* start from the end of the new array */
+ sra->reshape_progress = (sra->component_size
+ * reshape->after.data_disks);
+ }
+
+ ioctl(fd, GET_ARRAY_INFO, &array);
+ if (info->array.chunk_size == info->new_chunk &&
+ reshape->before.layout == reshape->after.layout &&
+ st->ss->external == 0) {
+ /* use SET_ARRAY_INFO but only if reshape hasn't started */
+ array.raid_disks = reshape->after.data_disks + reshape->parity;
+ if (!restart &&
+ ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
+ int err = errno;
+
+ pr_err("Cannot set device shape for %s: %s\n",
+ devname, strerror(errno));
+
+ if (err == EBUSY &&
+ (array.state & (1<<MD_SB_BITMAP_PRESENT)))
+ cont_err("Bitmap must be removed before"
+ " shape can be changed\n");
+
+ goto release;
+ }
+ } else if (!restart) {
+ /* set them all just in case some old 'new_*' value
+ * persists from some earlier problem.
+ */
+ int err = 0;
+ if (sysfs_set_num(sra, NULL, "chunk_size", info->new_chunk) < 0)
+ err = errno;
+ if (!err && sysfs_set_num(sra, NULL, "layout",
+ reshape->after.layout) < 0)
+ err = errno;
+ if (!err && subarray_set_num(container, sra, "raid_disks",
+ reshape->after.data_disks +
+ reshape->parity) < 0)
+ err = errno;
+ if (err) {
+ pr_err("Cannot set device shape for %s\n",
+ devname);
+
+ if (err == EBUSY &&
+ (array.state & (1<<MD_SB_BITMAP_PRESENT)))
+ cont_err("Bitmap must be removed before"
+ " shape can be changed\n");
+ goto release;
+ }
+ }
+ return 0;
+release:
+ return -1;
+}
+
+static int impose_level(int fd, int level, char *devname, int verbose)
+{
+ char *c;
+ struct mdu_array_info_s array;
+ struct mdinfo info;
+ sysfs_init(&info, fd, NULL);
+
+ ioctl(fd, GET_ARRAY_INFO, &array);
+ if (level == 0 &&
+ (array.level >= 4 && array.level <= 6)) {
+ /* To convert to RAID0 we need to fail and
+ * remove any non-data devices. */
+ int found = 0;
+ int d;
+ int data_disks = array.raid_disks - 1;
+ if (array.level == 6)
+ data_disks -= 1;
+ if (array.level == 5 &&
+ array.layout != ALGORITHM_PARITY_N)
+ return -1;
+ if (array.level == 6 &&
+ array.layout != ALGORITHM_PARITY_N_6)
+ return -1;
+ sysfs_set_str(&info, NULL,"sync_action", "idle");
+ /* First remove any spares so no recovery starts */
+ for (d = 0, found = 0;
+ d < MAX_DISKS && found < array.nr_disks;
+ d++) {
+ mdu_disk_info_t disk;
+ disk.number = d;
+ if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
+ continue;
+ if (disk.major == 0 && disk.minor == 0)
+ continue;
+ found++;
+ if ((disk.state & (1 << MD_DISK_ACTIVE))
+ && disk.raid_disk < data_disks)
+ /* keep this */
+ continue;
+ ioctl(fd, HOT_REMOVE_DISK,
+ makedev(disk.major, disk.minor));
+ }
+ /* Now fail anything left */
+ ioctl(fd, GET_ARRAY_INFO, &array);
+ for (d = 0, found = 0;
+ d < MAX_DISKS && found < array.nr_disks;
+ d++) {
+ int cnt;
+ mdu_disk_info_t disk;
+ disk.number = d;
+ if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
+ continue;
+ if (disk.major == 0 && disk.minor == 0)
+ continue;
+ found++;
+ if ((disk.state & (1 << MD_DISK_ACTIVE))
+ && disk.raid_disk < data_disks)
+ /* keep this */
+ continue;
+ ioctl(fd, SET_DISK_FAULTY,
+ makedev(disk.major, disk.minor));
+ cnt = 5;
+ while (ioctl(fd, HOT_REMOVE_DISK,
+ makedev(disk.major, disk.minor)) < 0
+ && errno == EBUSY
+ && cnt--) {
+ usleep(10000);
+ }
+ }
+ }
+ c = map_num(pers, level);
+ if (c) {
+ int err = sysfs_set_str(&info, NULL, "level", c);
+ if (err) {
+ err = errno;
+ pr_err("%s: could not set level to %s\n",
+ devname, c);
+ if (err == EBUSY &&
+ (array.state & (1<<MD_SB_BITMAP_PRESENT)))
+ cont_err("Bitmap must be removed"
+ " before level can be changed\n");
+ return err;
+ }
+ if (verbose >= 0)
+ pr_err("level of %s changed to %s\n",
+ devname, c);
+ }
+ return 0;
+}
+
+int sigterm = 0;
+static void catch_term(int sig)
+{
+ sigterm = 1;
+}
+
+static int continue_via_systemd(char *devnm)
+{
+ int skipped, i, pid, status;
+ char pathbuf[1024];
+ /* In a systemd/udev world, it is best to get systemd to
+ * run "mdadm --grow --continue" rather than running in the
+ * background.
+ */
+ switch(fork()) {
+ case 0:
+ /* FIXME yuk. CLOSE_EXEC?? */
+ skipped = 0;
+ for (i = 3; skipped < 20; i++)
+ if (close(i) < 0)
+ skipped++;
+ else
+ skipped = 0;
+
+ /* Don't want to see error messages from
+ * systemctl. If the service doesn't exist,
+ * we fork ourselves.
+ */
+ close(2);
+ open("/dev/null", O_WRONLY);
+ snprintf(pathbuf, sizeof(pathbuf), "mdadm-grow-continue@%s.service",
+ devnm);
+ status = execl("/usr/bin/systemctl", "systemctl",
+ "start",
+ pathbuf, NULL);
+ status = execl("/bin/systemctl", "systemctl", "start",
+ pathbuf, NULL);
+ exit(1);
+ case -1: /* Just do it ourselves. */
+ break;
+ default: /* parent - good */
+ pid = wait(&status);
+ if (pid >= 0 && status == 0)
+ return 1;
+ }
+ return 0;
+}
+
+static int reshape_array(char *container, int fd, char *devname,
+ struct supertype *st, struct mdinfo *info,
+ int force, struct mddev_dev *devlist,
+ unsigned long long data_offset,
+ char *backup_file, int verbose, int forked,
+ int restart, int freeze_reshape)
+{
+ struct reshape reshape;
+ int spares_needed;
+ char *msg;
+ int orig_level = UnSet;
+ int odisks;
+ int delayed;
+
+ struct mdu_array_info_s array;
+ char *c;
+
+ struct mddev_dev *dv;
+ int added_disks;
+
+ int *fdlist = NULL;
+ unsigned long long *offsets = NULL;
+ int d;
+ int nrdisks;
+ int err;
+ unsigned long blocks;
+ unsigned long long array_size;
+ int done;
+ struct mdinfo *sra = NULL;
+ char buf[20];
+
+ /* when reshaping a RAID0, the component_size might be zero.
+ * So try to fix that up.
+ */
+ if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
+ dprintf("Cannot get array information.\n");
+ goto release;
+ }
+ if (array.level == 0 && info->component_size == 0) {
+ get_dev_size(fd, NULL, &array_size);
+ info->component_size = array_size / array.raid_disks;
+ }
+
+ if (array.level == 10)
+ /* Need space_after info */
+ get_space_after(fd, st, info);
+
+ if (info->reshape_active) {
+ int new_level = info->new_level;
+ info->new_level = UnSet;
+ if (info->delta_disks > 0)
+ info->array.raid_disks -= info->delta_disks;
+ msg = analyse_change(devname, info, &reshape);
+ info->new_level = new_level;
+ if (info->delta_disks > 0)
+ info->array.raid_disks += info->delta_disks;
+ if (!restart)
+ /* Make sure the array isn't read-only */
+ ioctl(fd, RESTART_ARRAY_RW, 0);
+ } else
+ msg = analyse_change(devname, info, &reshape);
+ if (msg) {
+ /* if msg == "", error has already been printed */
+ if (msg[0])
+ pr_err("%s\n", msg);
+ goto release;
+ }
+ if (restart &&
+ (reshape.level != info->array.level ||
+ reshape.before.layout != info->array.layout ||
+ reshape.before.data_disks + reshape.parity
+ != info->array.raid_disks - max(0, info->delta_disks))) {
+ pr_err("reshape info is not in native format -"
+ " cannot continue.\n");
+ goto release;
+ }
+
+ if (st->ss->external && restart && (info->reshape_progress == 0) &&
+ !((sysfs_get_str(info, NULL, "sync_action", buf, sizeof(buf)) > 0) &&
+ (strncmp(buf, "reshape", 7) == 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)
+ return 0;
+ if (restart & RESHAPE_NO_BACKUP)
+ return 0;
+
+ /* Need 'sra' down at 'started:' */
+ sra = sysfs_read(fd, NULL,
+ GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|GET_CHUNK|
+ GET_CACHE);
+ if (!sra) {
+ pr_err("%s: Cannot get array details from sysfs\n",
+ devname);
+ goto release;
+ }
+
+ if (!backup_file)
+ backup_file = locate_backup(sra->sys_name);
+
+ goto started;
+ }
+ /* The container is frozen but the array may not be.
+ * So freeze the array so spares don't get put to the wrong use
+ * FIXME there should probably be a cleaner separation between
+ * freeze_array and freeze_container.
+ */
+ sysfs_freeze_array(info);
+ /* Check we have enough spares to not be degraded */
+ added_disks = 0;
+ for (dv = devlist; dv ; dv=dv->next)
+ added_disks++;
+ spares_needed = max(reshape.before.data_disks,
+ reshape.after.data_disks)
+ + reshape.parity - array.raid_disks;
+
+ if (!force &&
+ info->new_level > 1 && info->array.level > 1 &&
+ spares_needed > 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 */
+ spares_needed = max(reshape.before.data_disks,
+ reshape.after.data_disks)
+ - array.raid_disks;
+ if ((info->new_level > 1 || info->new_level == 0) &&
+ spares_needed > 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;
+ }
+
+ if (reshape.level != array.level) {
+ int err = impose_level(fd, reshape.level, devname, verbose);
+ if (err)
+ goto release;
+ info->new_layout = UnSet; /* after level change,
+ * layout is meaningless */
+ 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(container))
+ flush_mdmon(container);
+
+ if (!mdmon_running(container))
+ start_mdmon(container);
+ ping_monitor(container);
+ if (mdmon_running(container) &&
+ st->update_tail == NULL)
+ st->update_tail = &st->updates;
+ }
+ }
+ /* ->reshape_super might have chosen some spares from the
+ * container that it wants to be part of the new array.
+ * We can collect them with ->container_content and give
+ * them to the kernel.
+ */
+ if (st->ss->reshape_super && st->ss->container_content) {
+ char *subarray = strchr(info->text_version+1, '/')+1;
+ struct mdinfo *info2 =
+ st->ss->container_content(st, subarray);
+ struct mdinfo *d;
+
+ if (info2) {
+ sysfs_init(info2, fd, st->devnm);
+ /* When increasing number of devices, we need to set
+ * new raid_disks before adding these, or they might
+ * be rejected.
+ */
+ if (reshape.backup_blocks &&
+ reshape.after.data_disks > reshape.before.data_disks)
+ subarray_set_num(container, info2, "raid_disks",
+ reshape.after.data_disks +
+ reshape.parity);
+ for (d = info2->devs; d; d = d->next) {
+ if (d->disk.state == 0 &&
+ d->disk.raid_disk >= 0) {
+ /* This is a spare that wants to
+ * be part of the array.
+ */
+ add_disk(fd, st, info2, d);
+ }
+ }
+ sysfs_free(info2);
+ }
+ }
+ /* We might have been given some devices to add to the
+ * array. Now that the array has been changed to the right
+ * level and frozen, we can safely add them.
+ */
+ if (devlist)
+ Manage_subdevs(devname, fd, devlist, verbose,
+ 0,NULL, 0);
+
+ if (reshape.backup_blocks == 0 && data_offset != INVALID_SECTORS)
+ reshape.backup_blocks = reshape.before.data_disks * info->array.chunk_size/512;
+ if (reshape.backup_blocks == 0) {
+ /* No restriping needed, but we might need to impose
+ * some more changes: layout, raid_disks, chunk_size
+ */
+ /* read current array info */
+ if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
+ dprintf("Cannot get array information.\n");
+ goto release;
+ }
+ /* compare current array info with new values and if
+ * it is different update them to new */
+ if (info->new_layout != UnSet &&
+ info->new_layout != array.layout) {
+ array.layout = info->new_layout;
+ if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
+ pr_err("failed to set new layout\n");
+ goto release;
+ } else if (verbose >= 0)
+ printf("layout for %s set to %d\n",
+ devname, array.layout);
+ }
+ if (info->delta_disks != UnSet &&
+ info->delta_disks != 0 &&
+ array.raid_disks != (info->array.raid_disks + info->delta_disks)) {
+ array.raid_disks += info->delta_disks;
+ if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
+ pr_err("failed to set raid disks\n");
+ goto release;
+ } else if (verbose >= 0) {
+ printf("raid_disks for %s set to %d\n",
+ devname, array.raid_disks);
+ }
+ }
+ if (info->new_chunk != 0 &&
+ info->new_chunk != array.chunk_size) {
+ if (sysfs_set_num(info, NULL,
+ "chunk_size", info->new_chunk) != 0) {
+ pr_err("failed to set chunk size\n");
+ goto release;
+ } else if (verbose >= 0)
+ printf("chunk size for %s set to %d\n",
+ devname, array.chunk_size);
+ }
+ unfreeze(st);
+ return 0;
+ }
+
+ /*
+ * There are three possibilities.
+ * 1/ The array will shrink.
+ * We need to ensure the reshape will pause before reaching
+ * the 'critical section'. We also need to fork and wait for
+ * that to happen. When it does we
+ * suspend/backup/complete/unfreeze
+ *
+ * 2/ The array will not change size.
+ * This requires that we keep a backup of a sliding window
+ * so that we can restore data after a crash. So we need
+ * to fork and monitor progress.
+ * In future we will allow the data_offset to change, so
+ * a sliding backup becomes unnecessary.
+ *
+ * 3/ The array will grow. This is relatively easy.
+ * However the kernel's restripe routines will cheerfully
+ * overwrite some early data before it is safe. So we
+ * need to make a backup of the early parts of the array
+ * and be ready to restore it if rebuild aborts very early.
+ * For externally managed metadata, we still need a forked
+ * child to monitor the reshape and suspend IO over the region
+ * that is being reshaped.
+ *
+ * We backup data by writing it to one spare, or to a
+ * file which was given on command line.
+ *
+ * In each case, we first make sure that storage is available
+ * for the required backup.
+ * Then we:
+ * - request the shape change.
+ * - fork to handle backup etc.
+ */
+ /* Check that we can hold all the data */
+ get_dev_size(fd, NULL, &array_size);
+ if (reshape.new_size < (array_size/512)) {
+ 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;
+ }
+
+ if (array.level == 10) {
+ /* Reshaping RAID10 does not require any data backup by
+ * user-space. Instead it requires that the data_offset
+ * is changed to avoid the need for backup.
+ * So this is handled very separately
+ */
+ if (restart)
+ /* Nothing to do. */
+ return 0;
+ return raid10_reshape(container, fd, devname, st, info,
+ &reshape, data_offset,
+ force, verbose);
+ }
+ sra = sysfs_read(fd, NULL,
+ GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|GET_CHUNK|
+ GET_CACHE);
+ if (!sra) {
+ pr_err("%s: Cannot get array details from sysfs\n",
+ devname);
+ goto release;
+ }
+
+ if (!backup_file)
+ switch(set_new_data_offset(sra, st, devname,
+ reshape.after.data_disks - reshape.before.data_disks,
+ data_offset,
+ reshape.min_offset_change, 1)) {
+ case -1:
+ goto release;
+ case 0:
+ /* Updated data_offset, so it's easy now */
+ update_cache_size(container, sra, info,
+ min(reshape.before.data_disks,
+ reshape.after.data_disks),
+ reshape.backup_blocks);
+
+ /* Right, everything seems fine. Let's kick things off.
+ */
+ sync_metadata(st);
+
+ if (impose_reshape(sra, info, st, fd, restart,
+ devname, container, &reshape) < 0)
+ goto release;
+ if (sysfs_set_str(sra, NULL, "sync_action", "reshape") < 0) {
+ pr_err("Failed to initiate reshape!\n");
+ goto release;
+ }
+ if (info->new_level == reshape.level)
+ return 0;
+ /* need to adjust level when reshape completes */
+ switch(fork()) {
+ case -1: /* ignore error, but don't wait */
+ return 0;
+ default: /* parent */
+ return 0;
+ case 0:
+ map_fork();
+ break;
+ }
+ close(fd);
+ wait_reshape(sra);
+ fd = open_dev(sra->sys_name);
+ if (fd >= 0)
+ impose_level(fd, info->new_level, devname, verbose);
+ return 0;
+ case 1: /* Couldn't set data_offset, try the old way */
+ if (data_offset != INVALID_SECTORS) {
+ pr_err("Cannot update data_offset on this array\n");
+ goto release;
+ }
+ break;
+ }
+
+started:
+ /* Decide how many blocks (sectors) for a reshape
+ * unit. The number we have so far is just a minimum
+ */
+ blocks = reshape.backup_blocks;
+ if (reshape.before.data_disks ==
+ reshape.after.data_disks) {
+ /* Make 'blocks' bigger for better throughput, but
+ * not so big that we reject it below.
+ * Try for 16 megabytes
+ */
+ while (blocks * 32 < sra->component_size &&
+ blocks < 16*1024*2)
+ blocks *= 2;
+ } else
+ pr_err("Need to backup %luK of critical "
+ "section..\n", blocks/2);
+
+ if (blocks >= sra->component_size/2) {
+ pr_err("%s: Something wrong"
+ " - reshape aborted\n",
+ devname);
+ goto release;
+ }
+
+ /* Now we need to open all these devices so we can read/write.
+ */
+ nrdisks = max(reshape.before.data_disks,
+ reshape.after.data_disks) + reshape.parity
+ + sra->array.spare_disks;
+ 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,
+ nrdisks, blocks, backup_file,
+ fdlist, offsets);
+ if (d < 0) {
+ goto release;
+ }
+ if ((st->ss->manage_reshape == NULL) ||
+ (st->ss->recover_backup == NULL)) {
+ if (backup_file == NULL) {
+ if (reshape.after.data_disks <=
+ reshape.before.data_disks) {
+ pr_err("%s: Cannot grow - need backup-file\n",
+ devname);
+ pr_err(" Please provide one with \"--backup=...\"\n");
+ goto release;
+ } else if (sra->array.spare_disks == 0) {
+ pr_err("%s: Cannot grow - "
+ "need a spare or backup-file to backup "
+ "critical section\n", devname);
+ goto release;
+ }
+ } else {
+ if (!reshape_open_backup_file(backup_file, fd, devname,
+ (signed)blocks,
+ fdlist+d, offsets+d,
+ sra->sys_name,
+ restart)) {
+ goto release;
+ }
+ d++;
+ }
+ }
+
+ update_cache_size(container, sra, info,
+ min(reshape.before.data_disks, reshape.after.data_disks),
+ blocks);
+
+ /* Right, everything seems fine. Let's kick things off.
+ * If only changing raid_disks, use ioctl, else use
+ * sysfs.
+ */
+ sync_metadata(st);
+
+ if (impose_reshape(sra, info, st, fd, restart,
+ devname, container, &reshape) < 0)
+ goto release;
+
+ err = start_reshape(sra, restart, reshape.before.data_disks,
+ reshape.after.data_disks);
+ if (err) {
+ pr_err("Cannot %s reshape for %s\n",
+ restart ? "continue" : "start",
+ devname);
+ goto release;
+ }
+ if (restart)
+ sysfs_set_str(sra, NULL, "array_state", "active");
+ if (freeze_reshape) {
+ free(fdlist);
+ free(offsets);
+ sysfs_free(sra);
+ pr_err("Reshape has to be continued from"
+ " location %llu when root filesystem has been mounted.\n",
+ sra->reshape_progress);
+ return 1;
+ }
+
+ if (!forked && !check_env("MDADM_NO_SYSTEMCTL"))
+ if (continue_via_systemd(container ?: sra->sys_name)) {
+ free(fdlist);
+ free(offsets);
+ sysfs_free(sra);
+ return 0;
+ }
+
+ /* Now we just need to kick off the reshape and watch, while
+ * handling backups of the data...
+ * This is all done by a forked background process.
+ */
+ switch(forked ? 0 : fork()) {
+ case -1:
+ pr_err("Cannot run child to monitor reshape: %s\n",
+ strerror(errno));
+ abort_reshape(sra);
+ goto release;
+ default:
+ free(fdlist);
+ free(offsets);
+ sysfs_free(sra);
+ return 0;
+ case 0:
+ map_fork();
+ break;
+ }
+
+ /* If another array on the same devices is busy, the
+ * reshape will wait for them. This would mean that
+ * the first section that we suspend will stay suspended
+ * for a long time. So check on that possibility
+ * by looking for "DELAYED" in /proc/mdstat, and if found,
+ * wait a while
+ */
+ do {
+ struct mdstat_ent *mds, *m;
+ delayed = 0;
+ mds = mdstat_read(1, 0);
+ for (m = mds; m; m = m->next)
+ if (strcmp(m->devnm, sra->sys_name) == 0) {
+ if (m->resync &&
+ m->percent == RESYNC_DELAYED)
+ delayed = 1;
+ if (m->resync == 0)
+ /* Haven't started the reshape thread
+ * yet, wait a bit
+ */
+ delayed = 2;
+ break;
+ }
+ free_mdstat(mds);
+ if (delayed == 1 && get_linux_version() < 3007000) {
+ pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
+ " You might experience problems until other reshapes complete.\n");
+ delayed = 0;
+ }
+ if (delayed)
+ mdstat_wait(30 - (delayed-1) * 25);
+ } while (delayed);
+ mdstat_close();
+ close(fd);
+ if (check_env("MDADM_GROW_VERIFY"))
+ fd = open(devname, O_RDONLY | O_DIRECT);
+ else
+ fd = -1;
+ mlockall(MCL_FUTURE);
+
+ signal(SIGTERM, catch_term);
+
+ if (st->ss->external) {
+ /* metadata handler takes it from here */
+ done = st->ss->manage_reshape(
+ fd, sra, &reshape, st, blocks,
+ fdlist, offsets,
+ d - odisks, fdlist+odisks,
+ offsets+odisks);
+ } else
+ done = child_monitor(
+ fd, sra, &reshape, st, blocks,
+ fdlist, offsets,
+ d - odisks, fdlist+odisks,
+ offsets+odisks);
+
+ free(fdlist);
+ free(offsets);
+
+ if (backup_file && done) {
+ char *bul;
+ bul = make_backup(sra->sys_name);
+ if (bul) {
+ char buf[1024];
+ int l = readlink(bul, buf, sizeof(buf));
+ if (l > 0) {
+ buf[l]=0;
+ unlink(buf);
+ }
+ unlink(bul);
+ free(bul);
+ }
+ unlink(backup_file);
+ }
+ if (!done) {
+ abort_reshape(sra);
+ goto out;
+ }
+
+ if (!st->ss->external &&
+ !(reshape.before.data_disks != reshape.after.data_disks
+ && info->custom_array_size) &&
+ info->new_level == reshape.level &&
+ !forked) {
+ /* no need to wait for the reshape to finish as
+ * there is nothing more to do.
+ */
+ sysfs_free(sra);
+ exit(0);
+ }
+ wait_reshape(sra);
+
+ if (st->ss->external) {
+ /* Re-load the metadata as much could have changed */
+ int cfd = open_dev(st->container_devnm);
+ if (cfd >= 0) {
+ flush_mdmon(container);
+ st->ss->free_super(st);
+ st->ss->load_container(st, cfd, container);
+ close(cfd);
+ }
+ }
+
+ /* set new array size if required customer_array_size is used
+ * by this metadata.
+ */
+ if (reshape.before.data_disks !=
+ reshape.after.data_disks &&
+ info->custom_array_size)
+ set_array_size(st, info, info->text_version);
+
+ if (info->new_level != reshape.level) {
+ if (fd < 0)
+ fd = open(devname, O_RDONLY);
+ impose_level(fd, info->new_level, devname, verbose);
+ close(fd);
+ if (info->new_level == 0)
+ st->update_tail = NULL;
+ }
+out:
+ sysfs_free(sra);
+ if (forked)
+ return 0;
+ unfreeze(st);
+ exit(0);
+
+release:
+ free(fdlist);
+ free(offsets);
+ if (orig_level != UnSet && sra) {
+ c = map_num(pers, orig_level);
+ if (c && sysfs_set_str(sra, NULL, "level", c) == 0)
+ pr_err("aborting level change\n");
+ }
+ sysfs_free(sra);
+ if (!forked)
+ unfreeze(st);
+ return 1;
+}
+
+/* mdfd handle is passed to be closed in child process (after fork).
+ */
+int reshape_container(char *container, char *devname,
+ int mdfd,
+ struct supertype *st,
+ struct mdinfo *info,
+ int force,
+ char *backup_file, int verbose,
+ int forked, int restart, int freeze_reshape)
+{
+ struct mdinfo *cc = NULL;
+ int rv = restart;
+ char last_devnm[32] = "";
+
+ /* component_size is not meaningful for a container,
+ * so pass '0' meaning 'no change'
+ */
+ if (!restart &&
+ reshape_super(st, 0, info->new_level,
+ info->new_layout, info->new_chunk,
+ info->array.raid_disks, info->delta_disks,
+ backup_file, devname, APPLY_METADATA_CHANGES,
+ verbose)) {
+ unfreeze(st);
+ return 1;
+ }
+
+ sync_metadata(st);
+
+ /* ping monitor to be sure that update is on disk
+ */
+ ping_monitor(container);
+
+ if (!forked && !freeze_reshape && !check_env("MDADM_NO_SYSTEMCTL"))
+ if (continue_via_systemd(container))
+ return 0;
+
+ switch (forked ? 0 : fork()) {
+ case -1: /* error */
+ perror("Cannot fork to complete reshape\n");
+ unfreeze(st);
+ return 1;
+ default: /* parent */
+ if (!freeze_reshape)
+ printf(Name ": multi-array reshape continues"
+ " in background\n");
+ return 0;
+ case 0: /* child */
+ map_fork();
+ break;
+ }
+
+ /* close unused handle in child process
+ */
+ if (mdfd > -1)
+ close(mdfd);
+
+ while(1) {
+ /* For each member array with reshape_active,
+ * we need to perform the reshape.
+ * We pick the first array that needs reshaping and
+ * reshape it. reshape_array() will re-read the metadata
+ * so the next time through a different array should be
+ * ready for reshape.
+ * It is possible that the 'different' array will not
+ * be assembled yet. In that case we simple exit.
+ * When it is assembled, the mdadm which assembles it
+ * will take over the reshape.
+ */
+ struct mdinfo *content;
+ int fd;
+ struct mdstat_ent *mdstat;
+ char *adev;
+ int devid;
+
+ sysfs_free(cc);
+
+ cc = st->ss->container_content(st, NULL);
+
+ for (content = cc; content ; content = content->next) {
+ char *subarray;
+ if (!content->reshape_active)
+ continue;
+
+ subarray = strchr(content->text_version+1, '/')+1;
+ mdstat = mdstat_by_subdev(subarray, container);
+ if (!mdstat)
+ continue;
+ if (mdstat->active == 0) {
+ pr_err("Skipping inactive array %s.\n",
+ mdstat->devnm);
+ free_mdstat(mdstat);
+ mdstat = NULL;
+ continue;
+ }
+ break;
+ }
+ if (!content)
+ break;
+
+ devid = devnm2devid(mdstat->devnm);
+ adev = map_dev(major(devid), minor(devid), 0);
+ if (!adev)
+ adev = content->text_version;
+
+ fd = open_dev(mdstat->devnm);
+ if (fd < 0) {
+ printf(Name ": Device %s cannot be opened for reshape.",
+ adev);
+ break;
+ }
+
+ if (strcmp(last_devnm, mdstat->devnm) == 0) {
+ /* Do not allow for multiple reshape_array() calls for
+ * the same array.
+ * It can happen when reshape_array() returns without
+ * error, when reshape is not finished (wrong reshape
+ * starting/continuation conditions). Mdmon doesn't
+ * switch to next array in container and reentry
+ * conditions for the same array occur.
+ * This is possibly interim until the behaviour of
+ * reshape_array is resolved().
+ */
+ printf(Name ": Multiple reshape execution detected for "
+ "device %s.", adev);
+ close(fd);
+ break;
+ }
+ strcpy(last_devnm, mdstat->devnm);
+
+ sysfs_init(content, fd, mdstat->devnm);
+
+ if (mdmon_running(container))
+ flush_mdmon(container);
+
+ rv = reshape_array(container, fd, adev, st,
+ content, force, NULL, INVALID_SECTORS,
+ backup_file, verbose, 1, restart,
+ freeze_reshape);
+ close(fd);
+
+ if (freeze_reshape) {
+ sysfs_free(cc);
+ exit(0);
+ }
+
+ restart = 0;
+ if (rv)
+ break;
+
+ if (mdmon_running(container))
+ flush_mdmon(container);
+ }
+ if (!rv)
+ unfreeze(st);
+ sysfs_free(cc);
+ exit(0);
+}
+
+/*
+ * We run a child process in the background which performs the following
+ * steps:
+ * - wait for resync to reach a certain point
+ * - suspend io to the following section
+ * - backup that section
+ * - allow resync to proceed further
+ * - resume io
+ * - discard the backup.
+ *
+ * When are combined in slightly different ways in the three cases.
+ * Grow:
+ * - suspend/backup/allow/wait/resume/discard
+ * Shrink:
+ * - allow/wait/suspend/backup/allow/wait/resume/discard
+ * same-size:
+ * - wait/resume/discard/suspend/backup/allow
+ *
+ * suspend/backup/allow always come together
+ * wait/resume/discard do too.
+ * For the same-size case we have two backups to improve flow.
+ *
+ */
+
+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, int *frozen)
+{
+ /* 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 difficult 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 because it is all done,
+ * -2 if the reshape is finished due to an error.
+ */
+
+ int advancing = (reshape->after.data_disks
+ >= reshape->before.data_disks);
+ unsigned long long need_backup; /* All data between start of array and
+ * here will at some point need to
+ * be backed up.
+ */
+ unsigned long long read_offset, write_offset;
+ unsigned long long write_range;
+ unsigned long long max_progress, target, completed;
+ unsigned long long array_size = (info->component_size
+ * reshape->before.data_disks);
+ int fd;
+ char buf[20];
+
+ /* 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.
+ */
+ read_offset = info->reshape_progress / reshape->before.data_disks;
+ write_offset = info->reshape_progress / reshape->after.data_disks;
+ write_range = info->new_chunk/512;
+ if (reshape->before.data_disks == reshape->after.data_disks)
+ need_backup = array_size;
+ else
+ need_backup = reshape->backup_blocks;
+ if (advancing) {
+ if (read_offset < write_offset + write_range)
+ max_progress = backup_point;
+ else
+ max_progress =
+ read_offset *
+ reshape->after.data_disks;
+ } else {
+ if (read_offset > write_offset - write_range)
+ /* Can only progress as far as has been backed up,
+ * which must be suspended */
+ max_progress = backup_point;
+ else if (info->reshape_progress <= need_backup)
+ max_progress = backup_point;
+ else {
+ if (info->array.major_version >= 0)
+ /* Can progress until backup is needed */
+ max_progress = need_backup;
+ else {
+ /* Can progress until metadata update is required */
+ max_progress =
+ read_offset *
+ reshape->after.data_disks;
+ /* but data must be suspended */
+ if (max_progress < *suspend_point)
+ 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'
+ * FIXME this is too big - it takes to long to complete
+ * this much.
+ */
+ target = 64*1024*2 * min(reshape->before.data_disks,
+ reshape->after.data_disks);
+ target /= reshape->backup_blocks;
+ if (target < 2)
+ target = 2;
+ target *= reshape->backup_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->reshape_progress
+ || info->array.major_version < 0) &&
+ *suspend_point < info->reshape_progress + target) {
+ if (need_backup < *suspend_point + 2 * target)
+ *suspend_point = need_backup;
+ else if (*suspend_point + 2 * target < array_size)
+ *suspend_point += 2 * target;
+ else
+ *suspend_point = array_size;
+ sysfs_set_num(info, NULL, "suspend_hi", *suspend_point);
+ if (max_progress > *suspend_point)
+ max_progress = *suspend_point;
+ }
+ } else {
+ if (info->array.major_version >= 0) {
+ /* Only need to suspend when about to backup */
+ if (info->reshape_progress < need_backup * 2 &&
+ *suspend_point > 0) {
+ *suspend_point = 0;
+ sysfs_set_num(info, NULL, "suspend_lo", 0);
+ sysfs_set_num(info, NULL, "suspend_hi", need_backup);
+ }
+ } else {
+ /* Need to suspend continually */
+ if (info->reshape_progress < *suspend_point)
+ *suspend_point = info->reshape_progress;
+ if (*suspend_point + target < info->reshape_progress)
+ /* No need to move suspend region yet */;
+ else {
+ if (*suspend_point >= 2 * target)
+ *suspend_point -= 2 * target;
+ else
+ *suspend_point = 0;
+ sysfs_set_num(info, NULL, "suspend_lo",
+ *suspend_point);
+ }
+ if (max_progress < *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.
+ */
+ /* scale down max_progress to per_disk */
+ max_progress /= reshape->after.data_disks;
+ /* Round to chunk size as some kernels give an erroneously high number */
+ max_progress /= info->new_chunk/512;
+ max_progress *= info->new_chunk/512;
+ /* And round to old chunk size as the kernel wants that */
+ max_progress /= info->array.chunk_size/512;
+ max_progress *= info->array.chunk_size/512;
+ /* Limit progress to the whole device */
+ if (max_progress > info->component_size)
+ max_progress = info->component_size;
+ wait_point /= reshape->after.data_disks;
+ if (!advancing) {
+ /* switch from 'device offset' to 'processed block count' */
+ max_progress = info->component_size - max_progress;
+ wait_point = info->component_size - wait_point;
+ }
+
+ if (!*frozen)
+ 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)
+ goto check_progress;
+
+ if (sysfs_fd_get_ll(fd, &completed) < 0)
+ goto check_progress;
+
+ 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];
+ if (sysfs_get_str(info, NULL, "sync_action",
+ action, 20) <= 0 ||
+ strncmp(action, "reshape", 7) != 0)
+ break;
+ /* Some kernels reset 'sync_completed' to zero
+ * before setting 'sync_action' to 'idle'.
+ * So we need these extra tests.
+ */
+ if (completed == 0 && advancing
+ && info->reshape_progress > 0)
+ break;
+ if (completed == 0 && !advancing
+ && info->reshape_progress < (info->component_size
+ * reshape->after.data_disks))
+ break;
+ sysfs_wait(fd, NULL);
+ if (sysfs_fd_get_ll(fd, &completed) < 0)
+ goto check_progress;
+ }
+ /* Some kernels reset 'sync_completed' to zero,
+ * we need to have real point we are in md
+ */
+ if (completed == 0)
+ completed = max_progress;
+
+ /* some kernels can give an incorrectly high 'completed' number */
+ completed /= (info->new_chunk/512);
+ completed *= (info->new_chunk/512);
+ /* 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 ->backup_blocks up to *suspend_point
+ */
+ if (advancing)
+ return need_backup > info->reshape_progress;
+ else
+ return need_backup >= info->reshape_progress;
+
+check_progress:
+ /* if we couldn't read a number from sync_completed, then
+ * either the reshape did complete, or it aborted.
+ * We can tell which by checking for 'none' in reshape_position.
+ * If it did abort, then it might immediately restart if it
+ * it was just a device failure that leaves us degraded but
+ * functioning.
+ */
+ strcpy(buf, "hi");
+ if (sysfs_get_str(info, NULL, "reshape_position", buf, sizeof(buf)) < 0
+ || strncmp(buf, "none", 4) != 0) {
+ /* The abort might only be temporary. Wait up to 10
+ * seconds for fd to contain a valid number again.
+ */
+ int wait = 10000;
+ int rv = -2;
+ unsigned long long new_sync_max;
+ while (fd >= 0 && rv < 0 && wait > 0) {
+ if (sysfs_wait(fd, &wait) != 1)
+ break;
+ switch (sysfs_fd_get_ll(fd, &completed)) {
+ case 0:
+ /* all good again */
+ rv = 1;
+ /* If "sync_max" is no longer max_progress
+ * we need to freeze things
+ */
+ sysfs_get_ll(info, NULL, "sync_max", &new_sync_max);
+ *frozen = (new_sync_max != max_progress);
+ break;
+ case -2: /* read error - abort */
+ wait = 0;
+ break;
+ }
+ }
+ if (fd >= 0)
+ close(fd);
+ return rv; /* abort */
+ } else {
+ /* Maybe racing with array shutdown - check state */
+ if (fd >= 0)
+ close(fd);
+ if (sysfs_get_str(info, NULL, "array_state", buf, sizeof(buf)) < 0
+ || strncmp(buf, "inactive", 8) == 0
+ || strncmp(buf, "clear",5) == 0)
+ return -2; /* abort */
+ return -1; /* complete */
+ }
+}
+
+/* FIXME return status is never checked */
+static int grow_backup(struct mdinfo *sra,
+ unsigned long long offset, /* 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,
+ int part, int *degraded,
+ char *buf)
+{
+ /* Backup 'blocks' sectors at 'offset' on each device of the array,
+ * to storage 'destfd' (offset 'destoffsets'), after first
+ * suspending IO. Then allow resync to continue
+ * over the suspended section.
+ * Use part 'part' of the backup-super-block.
+ */
+ int odata = disks;
+ int rv = 0;
+ int i;
+ unsigned long long ll;
+ int new_degraded;
+ //printf("offset %llu\n", offset);
+ if (level >= 4)
+ odata--;
+ if (level == 6)
+ odata--;
+
+ /* Check that array hasn't become degraded, else we might backup the wrong data */
+ if (sysfs_get_ll(sra, NULL, "degraded", &ll) < 0)
+ return -1; /* FIXME this error is ignored */
+ new_degraded = (int)ll;
+ if (new_degraded != *degraded) {
+ /* check each device to ensure it is still working */
+ struct mdinfo *sd;
+ 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 sbuf[20];
+ if (sysfs_get_str(sra, sd, "state", sbuf, 20) < 0 ||
+ strstr(sbuf, "faulty") ||
+ strstr(sbuf, "in_sync") == NULL) {
+ /* this device is dead */
+ sd->disk.state = (1<<MD_DISK_FAULTY);
+ if (sd->disk.raid_disk >= 0 &&
+ sources[sd->disk.raid_disk] >= 0) {
+ close(sources[sd->disk.raid_disk]);
+ sources[sd->disk.raid_disk] = -1;
+ }
+ }
+ }
+ }
+ *degraded = new_degraded;
+ }
+ if (part) {
+ bsb.arraystart2 = __cpu_to_le64(offset * odata);
+ bsb.length2 = __cpu_to_le64(stripes * (chunk/512) * odata);
+ } else {
+ bsb.arraystart = __cpu_to_le64(offset * odata);
+ bsb.length = __cpu_to_le64(stripes * (chunk/512) * odata);
+ }
+ if (part)
+ bsb.magic[15] = '2';
+ for (i = 0; i < dests; i++)
+ if (part)
+ lseek64(destfd[i], destoffsets[i] + __le64_to_cpu(bsb.devstart2)*512, 0);
+ else
+ lseek64(destfd[i], destoffsets[i], 0);
+
+ rv = save_stripes(sources, offsets,
+ disks, chunk, level, layout,
+ dests, destfd,
+ offset*512*odata, stripes * chunk * odata,
+ buf);
+
+ if (rv)
+ return rv;
+ bsb.mtime = __cpu_to_le64(time(0));
+ for (i = 0; i < dests; i++) {
+ bsb.devstart = __cpu_to_le64(destoffsets[i]/512);
+
+ bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb));
+ if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0)
+ bsb.sb_csum2 = bsb_csum((char*)&bsb,
+ ((char*)&bsb.sb_csum2)-((char*)&bsb));
+
+ rv = -1;
+ if ((unsigned long long)lseek64(destfd[i], destoffsets[i] - 4096, 0)
+ != destoffsets[i] - 4096)
+ break;
+ if (write(destfd[i], &bsb, 512) != 512)
+ break;
+ if (destoffsets[i] > 4096) {
+ if ((unsigned long long)lseek64(destfd[i], destoffsets[i]+stripes*chunk*odata, 0) !=
+ destoffsets[i]+stripes*chunk*odata)
+ break;
+ if (write(destfd[i], &bsb, 512) != 512)
+ break;
+ }
+ fsync(destfd[i]);
+ rv = 0;
+ }
+
+ return rv;
+}
+
+/* in 2.6.30, the value reported by sync_completed can be
+ * less that it should be by one stripe.
+ * This only happens when reshape hits sync_max and pauses.
+ * So allow wait_backup to either extent sync_max further
+ * than strictly necessary, or return before the
+ * sync has got quite as far as we would really like.
+ * This is what 'blocks2' is for.
+ * The various caller give appropriate values so that
+ * every works.
+ */
+/* FIXME return value is often ignored */
+static int forget_backup(int dests, int *destfd,
+ unsigned long long *destoffsets,
+ int part)
+{
+ /*
+ * Erase backup 'part' (which is 0 or 1)
+ */
+ int i;
+ int rv;
+
+ if (part) {
+ bsb.arraystart2 = __cpu_to_le64(0);
+ bsb.length2 = __cpu_to_le64(0);
+ } else {
+ bsb.arraystart = __cpu_to_le64(0);
+ bsb.length = __cpu_to_le64(0);
+ }
+ bsb.mtime = __cpu_to_le64(time(0));
+ rv = 0;
+ for (i = 0; i < dests; i++) {
+ bsb.devstart = __cpu_to_le64(destoffsets[i]/512);
+ bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb));
+ if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0)
+ bsb.sb_csum2 = bsb_csum((char*)&bsb,
+ ((char*)&bsb.sb_csum2)-((char*)&bsb));
+ if ((unsigned long long)lseek64(destfd[i], destoffsets[i]-4096, 0) !=
+ destoffsets[i]-4096)
+ rv = -1;
+ if (rv == 0 &&
+ write(destfd[i], &bsb, 512) != 512)
+ rv = -1;
+ fsync(destfd[i]);
+ }
+ return rv;
+}
+
+static void fail(char *msg)
+{
+ int rv;
+ rv = (write(2, msg, strlen(msg)) != (int)strlen(msg));
+ rv |= (write(2, "\n", 1) != 1);
+ exit(rv ? 1 : 2);
+}
+
+static char *abuf, *bbuf;
+static unsigned long long abuflen;
+static void validate(int afd, int bfd, unsigned long long offset)
+{
+ /* check that the data in the backup against the array.
+ * This is only used for regression testing and should not
+ * be used while the array is active
+ */
+ if (afd < 0)
+ return;
+ lseek64(bfd, offset - 4096, 0);
+ if (read(bfd, &bsb2, 512) != 512)
+ fail("cannot read bsb");
+ if (bsb2.sb_csum != bsb_csum((char*)&bsb2,
+ ((char*)&bsb2.sb_csum)-((char*)&bsb2)))
+ fail("first csum bad");
+ if (memcmp(bsb2.magic, "md_backup_data", 14) != 0)
+ fail("magic is bad");
+ if (memcmp(bsb2.magic, "md_backup_data-2", 16) == 0 &&
+ bsb2.sb_csum2 != bsb_csum((char*)&bsb2,
+ ((char*)&bsb2.sb_csum2)-((char*)&bsb2)))
+ fail("second csum bad");
+
+ if (__le64_to_cpu(bsb2.devstart)*512 != offset)
+ fail("devstart is wrong");
+
+ if (bsb2.length) {
+ unsigned long long len = __le64_to_cpu(bsb2.length)*512;
+
+ if (abuflen < len) {
+ free(abuf);
+ free(bbuf);
+ abuflen = len;
+ if (posix_memalign((void**)&abuf, 4096, abuflen) ||
+ posix_memalign((void**)&bbuf, 4096, abuflen)) {
+ abuflen = 0;
+ /* just stop validating on mem-alloc failure */
+ return;
+ }
+ }
+
+ lseek64(bfd, offset, 0);
+ if ((unsigned long long)read(bfd, bbuf, len) != len) {
+ //printf("len %llu\n", len);
+ fail("read first backup failed");
+ }
+ lseek64(afd, __le64_to_cpu(bsb2.arraystart)*512, 0);
+ if ((unsigned long long)read(afd, abuf, len) != len)
+ fail("read first from array failed");
+ if (memcmp(bbuf, abuf, len) != 0) {
+#if 0
+ int i;
+ printf("offset=%llu len=%llu\n",
+ (unsigned long long)__le64_to_cpu(bsb2.arraystart)*512, len);
+ for (i=0; i<len; i++)
+ if (bbuf[i] != abuf[i]) {
+ printf("first diff byte %d\n", i);
+ break;
+ }
+#endif
+ fail("data1 compare failed");
+ }
+ }
+ if (bsb2.length2) {
+ unsigned long long len = __le64_to_cpu(bsb2.length2)*512;
+
+ if (abuflen < len) {
+ free(abuf);
+ free(bbuf);
+ abuflen = len;
+ abuf = xmalloc(abuflen);
+ bbuf = xmalloc(abuflen);
+ }
+
+ lseek64(bfd, offset+__le64_to_cpu(bsb2.devstart2)*512, 0);
+ if ((unsigned long long)read(bfd, bbuf, len) != len)
+ fail("read second backup failed");
+ lseek64(afd, __le64_to_cpu(bsb2.arraystart2)*512, 0);
+ if ((unsigned long long)read(afd, abuf, len) != len)
+ fail("read second from array failed");
+ if (memcmp(bbuf, abuf, len) != 0)
+ fail("data2 compare failed");
+ }
+}
+
+int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape,
+ struct supertype *st, unsigned long blocks,
+ 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 = -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;
+ struct mdinfo *sd;
+ unsigned long stripes;
+ int uuid[4];
+ int frozen = 0;
+
+ /* set up the backup-super-block. This requires the
+ * uuid from the array.
+ */
+ /* Find a superblock */
+ for (sd = sra->devs; sd; sd = sd->next) {
+ char *dn;
+ int devfd;
+ int ok;
+ if (sd->disk.state & (1<<MD_DISK_FAULTY))
+ continue;
+ dn = map_dev(sd->disk.major, sd->disk.minor, 1);
+ devfd = dev_open(dn, O_RDONLY);
+ if (devfd < 0)
+ continue;
+ ok = st->ss->load_super(st, devfd, NULL);
+ close(devfd);
+ if (ok == 0)
+ break;
+ }
+ if (!sd) {
+ pr_err("Cannot find a superblock\n");
+ return 0;
+ }
+
+ memset(&bsb, 0, 512);
+ memcpy(bsb.magic, "md_backup_data-1", 16);
+ st->ss->uuid_from_super(st, uuid);
+ memcpy(bsb.set_uuid, uuid, 16);
+ bsb.mtime = __cpu_to_le64(time(0));
+ bsb.devstart2 = blocks;
+
+ stripes = blocks / (sra->array.chunk_size/512) /
+ reshape->before.data_disks;
+
+ if (posix_memalign((void**)&buf, 4096, disks * chunk))
+ /* Don't start the 'reshape' */
+ return 0;
+ 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);
+ }
+
+ if (increasing) {
+ array_size = sra->component_size * reshape->after.data_disks;
+ backup_point = sra->reshape_progress;
+ suspend_point = 0;
+ } else {
+ array_size = sra->component_size * reshape->before.data_disks;
+ backup_point = reshape->backup_blocks;
+ suspend_point = array_size;
+ }
+
+ while (!done) {
+ int rv;
+
+ /* 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);
+ }
+
+ reshape_completed = sra->reshape_progress;
+ rv = progress_reshape(sra, reshape,
+ backup_point, wait_point,
+ &suspend_point, &reshape_completed,
+ &frozen);
+ /* external metadata would need to ping_monitor here */
+ sra->reshape_progress = reshape_completed;
+
+ /* Clear any backup region that is before 'here' */
+ if (increasing) {
+ if (__le64_to_cpu(bsb.length) > 0 &&
+ reshape_completed >= (__le64_to_cpu(bsb.arraystart) +
+ __le64_to_cpu(bsb.length)))
+ forget_backup(dests, destfd,
+ destoffsets, 0);
+ if (__le64_to_cpu(bsb.length2) > 0 &&
+ reshape_completed >= (__le64_to_cpu(bsb.arraystart2) +
+ __le64_to_cpu(bsb.length2)))
+ forget_backup(dests, destfd,
+ destoffsets, 1);
+ } else {
+ if (__le64_to_cpu(bsb.length) > 0 &&
+ reshape_completed <= (__le64_to_cpu(bsb.arraystart)))
+ forget_backup(dests, destfd,
+ destoffsets, 0);
+ if (__le64_to_cpu(bsb.length2) > 0 &&
+ reshape_completed <= (__le64_to_cpu(bsb.arraystart2)))
+ forget_backup(dests, destfd,
+ destoffsets, 1);
+ }
+ if (sigterm)
+ rv = -2;
+ if (rv < 0) {
+ if (rv == -1)
+ done = 1;
+ break;
+ }
+ if (rv == 0 && increasing && !st->ss->external) {
+ /* No longer need to monitor this reshape */
+ sysfs_set_str(sra, NULL, "sync_max", "max");
+ done = 1;
+ break;
+ }
+
+ while (rv) {
+ unsigned long long offset;
+ unsigned long actual_stripes;
+ /* Need to backup some data.
+ * If 'part' is not used and the desired
+ * backup size is suspended, do a backup,
+ * then consider the next part.
+ */
+ /* Check that 'part' is unused */
+ if (part == 0 && __le64_to_cpu(bsb.length) != 0)
+ break;
+ if (part == 1 && __le64_to_cpu(bsb.length2) != 0)
+ break;
+
+ offset = backup_point / data;
+ actual_stripes = stripes;
+ if (increasing) {
+ if (offset + actual_stripes * (chunk/512) >
+ sra->component_size)
+ actual_stripes = ((sra->component_size - offset)
+ / (chunk/512));
+ if (offset + actual_stripes * (chunk/512) >
+ suspend_point/data)
+ break;
+ } else {
+ if (offset < actual_stripes * (chunk/512))
+ actual_stripes = offset / (chunk/512);
+ offset -= actual_stripes * (chunk/512);
+ if (offset < suspend_point/data)
+ break;
+ }
+ if (actual_stripes == 0)
+ break;
+ grow_backup(sra, offset, actual_stripes,
+ fds, offsets,
+ disks, chunk, level, layout,
+ dests, destfd, destoffsets,
+ part, &degraded, buf);
+ validate(afd, destfd[0], destoffsets[0]);
+ /* record where 'part' is up to */
+ part = !part;
+ if (increasing)
+ backup_point += actual_stripes * (chunk/512) * data;
+ else
+ backup_point -= actual_stripes * (chunk/512) * data;
+ }
+ }
+
+ /* FIXME maybe call progress_reshape one more time instead */
+ /* remove any remaining suspension */
+ sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
+ sysfs_set_num(sra, NULL, "suspend_hi", 0);
+ sysfs_set_num(sra, NULL, "suspend_lo", 0);
+ sysfs_set_num(sra, NULL, "sync_min", 0);
+
+ if (reshape->before.data_disks == reshape->after.data_disks)
+ sysfs_set_num(sra, NULL, "sync_speed_min", speed);
+ free(buf);
+ return done;
+}
+
+/*
+ * If any spare contains md_back_data-1 which is recent wrt mtime,
+ * write that data into the array and update the super blocks with
+ * the new reshape_progress
+ */
+int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt,
+ char *backup_file, int verbose)
+{
+ int i, j;
+ int old_disks;
+ unsigned long long *offsets;
+ unsigned long long nstripe, ostripe;
+ int ndata, odata;
+
+ odata = info->array.raid_disks - info->delta_disks - 1;
+ if (info->array.level == 6) odata--; /* number of data disks */
+ ndata = info->array.raid_disks - 1;
+ if (info->new_level == 6) ndata--;
+
+ old_disks = info->array.raid_disks - info->delta_disks;
+
+ if (info->delta_disks <= 0)
+ /* Didn't grow, so the backup file must have
+ * been used
+ */
+ old_disks = cnt;
+ for (i=old_disks-(backup_file?1:0); i<cnt; i++) {
+ struct mdinfo dinfo;
+ int fd;
+ int bsbsize;
+ char *devname, namebuf[20];
+ unsigned long long lo, hi;
+
+ /* This was a spare and may have some saved data on it.
+ * Load the superblock, find and load the
+ * backup_super_block.
+ * If either fail, go on to next device.
+ * If the backup contains no new info, just return
+ * else restore data and update all superblocks
+ */
+ if (i == old_disks-1) {
+ fd = open(backup_file, O_RDONLY);
+ if (fd<0) {
+ pr_err("backup file %s inaccessible: %s\n",
+ backup_file, strerror(errno));
+ continue;
+ }
+ devname = backup_file;
+ } else {
+ fd = fdlist[i];
+ if (fd < 0)
+ continue;
+ if (st->ss->load_super(st, fd, NULL))
+ continue;
+
+ st->ss->getinfo_super(st, &dinfo, NULL);
+ st->ss->free_super(st);
+
+ if (lseek64(fd,
+ (dinfo.data_offset + dinfo.component_size - 8) <<9,
+ 0) < 0) {
+ pr_err("Cannot seek on device %d\n", i);
+ continue; /* Cannot seek */
+ }
+ sprintf(namebuf, "device-%d", i);
+ devname = namebuf;
+ }
+ if (read(fd, &bsb, sizeof(bsb)) != sizeof(bsb)) {
+ if (verbose)
+ 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)
+ 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)
+ 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)
+ 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)
+ pr_err("Wrong uuid on backup-metadata on %s\n", devname);
+ continue; /* Wrong uuid */
+ }
+
+ /* array utime and backup-mtime should be updated at much the same time, but it seems that
+ * sometimes they aren't... So allow considerable flexability in matching, and allow
+ * this test to be overridden by an environment variable.
+ */
+ 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")) {
+ 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 {
+ pr_err("too-old timestamp on backup-metadata on %s\n", devname);
+ pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
+ continue; /* time stamp is too bad */
+ }
+ }
+
+ if (bsb.magic[15] == '1') {
+ if (bsb.length == 0)
+ continue;
+ if (info->delta_disks >= 0) {
+ /* reshape_progress is increasing */
+ if (__le64_to_cpu(bsb.arraystart)
+ + __le64_to_cpu(bsb.length)
+ < info->reshape_progress) {
+ nonew:
+ if (verbose)
+ pr_err("backup-metadata found on %s but is not needed\n", devname);
+ continue; /* No new data here */
+ }
+ } else {
+ /* reshape_progress is decreasing */
+ if (__le64_to_cpu(bsb.arraystart) >=
+ info->reshape_progress)
+ goto nonew; /* No new data here */
+ }
+ } else {
+ if (bsb.length == 0 && bsb.length2 == 0)
+ continue;
+ if (info->delta_disks >= 0) {
+ /* reshape_progress is increasing */
+ if ((__le64_to_cpu(bsb.arraystart)
+ + __le64_to_cpu(bsb.length)
+ < info->reshape_progress)
+ &&
+ (__le64_to_cpu(bsb.arraystart2)
+ + __le64_to_cpu(bsb.length2)
+ < info->reshape_progress))
+ goto nonew; /* No new data here */
+ } else {
+ /* reshape_progress is decreasing */
+ if (__le64_to_cpu(bsb.arraystart) >=
+ info->reshape_progress &&
+ __le64_to_cpu(bsb.arraystart2) >=
+ info->reshape_progress)
+ goto nonew; /* No new data here */
+ }
+ }
+ if (lseek64(fd, __le64_to_cpu(bsb.devstart)*512, 0)< 0) {
+ second_fail:
+ if (verbose)
+ 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 */
+ if (lseek64(fd, -4096, 1) < 0 ||
+ read(fd, &bsb2, sizeof(bsb2)) != sizeof(bsb2))
+ goto second_fail; /* Cannot find leading superblock */
+ if (bsb.magic[15] == '1')
+ bsbsize = offsetof(struct mdp_backup_super, pad1);
+ else
+ bsbsize = offsetof(struct mdp_backup_super, pad);
+ if (memcmp(&bsb2, &bsb, bsbsize) != 0)
+ goto second_fail; /* Cannot find leading superblock */
+
+ /* Now need the data offsets for all devices. */
+ offsets = xmalloc(sizeof(*offsets)*info->array.raid_disks);
+ for(j=0; j<info->array.raid_disks; j++) {
+ if (fdlist[j] < 0)
+ continue;
+ if (st->ss->load_super(st, fdlist[j], NULL))
+ /* FIXME should be this be an error */
+ continue;
+ st->ss->getinfo_super(st, &dinfo, NULL);
+ st->ss->free_super(st);
+ offsets[j] = dinfo.data_offset * 512;
+ }
+ printf(Name ": restoring critical section\n");
+
+ if (restore_stripes(fdlist, offsets,
+ info->array.raid_disks,
+ info->new_chunk,
+ info->new_level,
+ info->new_layout,
+ fd, __le64_to_cpu(bsb.devstart)*512,
+ __le64_to_cpu(bsb.arraystart)*512,
+ __le64_to_cpu(bsb.length)*512, NULL)) {
+ /* didn't succeed, so giveup */
+ if (verbose)
+ pr_err("Error restoring backup from %s\n",
+ devname);
+ free(offsets);
+ return 1;
+ }
+
+ if (bsb.magic[15] == '2' &&
+ restore_stripes(fdlist, offsets,
+ info->array.raid_disks,
+ info->new_chunk,
+ info->new_level,
+ info->new_layout,
+ fd, __le64_to_cpu(bsb.devstart)*512 +
+ __le64_to_cpu(bsb.devstart2)*512,
+ __le64_to_cpu(bsb.arraystart2)*512,
+ __le64_to_cpu(bsb.length2)*512, NULL)) {
+ /* didn't succeed, so giveup */
+ if (verbose)
+ pr_err("Error restoring second backup from %s\n",
+ devname);
+ free(offsets);
+ return 1;
+ }
+
+ free(offsets);
+
+ /* Ok, so the data is restored. Let's update those superblocks. */
+
+ lo = hi = 0;
+ if (bsb.length) {
+ lo = __le64_to_cpu(bsb.arraystart);
+ hi = lo + __le64_to_cpu(bsb.length);
+ }
+ if (bsb.magic[15] == '2' && bsb.length2) {
+ unsigned long long lo1, hi1;
+ lo1 = __le64_to_cpu(bsb.arraystart2);
+ hi1 = lo1 + __le64_to_cpu(bsb.length2);
+ if (lo == hi) {
+ lo = lo1;
+ hi = hi1;
+ } else if (lo < lo1)
+ hi = hi1;
+ else
+ lo = lo1;
+ }
+ if (lo < hi &&
+ (info->reshape_progress < lo ||
+ info->reshape_progress > hi))
+ /* backup does not affect reshape_progress*/ ;
+ else if (info->delta_disks >= 0) {
+ info->reshape_progress = __le64_to_cpu(bsb.arraystart) +
+ __le64_to_cpu(bsb.length);
+ if (bsb.magic[15] == '2') {
+ unsigned long long p2 = __le64_to_cpu(bsb.arraystart2) +
+ __le64_to_cpu(bsb.length2);
+ if (p2 > info->reshape_progress)
+ info->reshape_progress = p2;
+ }
+ } else {
+ info->reshape_progress = __le64_to_cpu(bsb.arraystart);
+ if (bsb.magic[15] == '2') {
+ unsigned long long p2 = __le64_to_cpu(bsb.arraystart2);
+ if (p2 < info->reshape_progress)
+ info->reshape_progress = p2;
+ }
+ }
+ for (j=0; j<info->array.raid_disks; j++) {
+ if (fdlist[j] < 0)
+ continue;
+ if (st->ss->load_super(st, fdlist[j], NULL))
+ continue;
+ st->ss->getinfo_super(st, &dinfo, NULL);
+ dinfo.reshape_progress = info->reshape_progress;
+ st->ss->update_super(st, &dinfo,
+ "_reshape_progress",
+ NULL,0, 0, NULL);
+ st->ss->store_super(st, fdlist[j]);
+ st->ss->free_super(st);
+ }
+ return 0;
+ }
+ /* Didn't find any backup data, try to see if any
+ * was needed.
+ */
+ if (info->delta_disks < 0) {
+ /* When shrinking, the critical section is at the end.
+ * So see if we are before the critical section.
+ */
+ unsigned long long first_block;
+ nstripe = ostripe = 0;
+ first_block = 0;
+ while (ostripe >= nstripe) {
+ ostripe += info->array.chunk_size / 512;
+ first_block = ostripe * odata;
+ nstripe = first_block / ndata / (info->new_chunk/512) *
+ (info->new_chunk/512);
+ }
+
+ if (info->reshape_progress >= first_block)
+ return 0;
+ }
+ if (info->delta_disks > 0) {
+ /* See if we are beyond the critical section. */
+ unsigned long long last_block;
+ nstripe = ostripe = 0;
+ last_block = 0;
+ while (nstripe >= ostripe) {
+ nstripe += info->new_chunk / 512;
+ last_block = nstripe * ndata;
+ ostripe = last_block / odata / (info->array.chunk_size/512) *
+ (info->array.chunk_size/512);
+ }
+
+ if (info->reshape_progress >= last_block)
+ return 0;
+ }
+ /* needed to recover critical section! */
+ if (verbose)
+ pr_err("Failed to find backup of critical section\n");
+ return 1;
+}
+
+int Grow_continue_command(char *devname, int fd,
+ char *backup_file, int verbose)
+{
+ int ret_val = 0;
+ struct supertype *st = NULL;
+ struct mdinfo *content = NULL;
+ struct mdinfo array;
+ char *subarray = NULL;
+ struct mdinfo *cc = NULL;
+ struct mdstat_ent *mdstat = NULL;
+ int cfd = -1;
+ int fd2 = -1;
+
+ dprintf("Grow continue from command line called for %s\n",
+ devname);
+
+ st = super_by_fd(fd, &subarray);
+ if (!st || !st->ss) {
+ pr_err("Unable to determine metadata format for %s\n",
+ devname);
+ return 1;
+ }
+ dprintf("Grow continue is run for ");
+ if (st->ss->external == 0) {
+ int d;
+ dprintf("native array (%s)\n", devname);
+ if (ioctl(fd, GET_ARRAY_INFO, &array.array) < 0) {
+ pr_err("%s is not an active md array -"
+ " aborting\n", devname);
+ ret_val = 1;
+ goto Grow_continue_command_exit;
+ }
+ content = &array;
+ /* Need to load a superblock.
+ * FIXME we should really get what we need from
+ * sysfs
+ */
+ for (d = 0; d < MAX_DISKS; d++) {
+ mdu_disk_info_t disk;
+ char *dv;
+ int err;
+ disk.number = d;
+ if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
+ continue;
+ if (disk.major == 0 && disk.minor == 0)
+ continue;
+ if ((disk.state & (1 << MD_DISK_ACTIVE)) == 0)
+ continue;
+ dv = map_dev(disk.major, disk.minor, 1);
+ if (!dv)
+ continue;
+ fd2 = dev_open(dv, O_RDONLY);
+ if (fd2 < 0)
+ continue;
+ err = st->ss->load_super(st, fd2, NULL);
+ close(fd2);
+ /* invalidate fd2 to avoid possible double close() */
+ fd2 = -1;
+ if (err)
+ continue;
+ break;
+ }
+ if (d == MAX_DISKS) {
+ pr_err("Unable to load metadata for %s\n",
+ devname);
+ ret_val = 1;
+ goto Grow_continue_command_exit;
+ }
+ st->ss->getinfo_super(st, content, NULL);
+ } else {
+ char *container;
+
+ if (subarray) {
+ dprintf("subarray (%s)\n", subarray);
+ container = st->container_devnm;
+ cfd = open_dev_excl(st->container_devnm);
+ } else {
+ container = st->devnm;
+ close(fd);
+ cfd = open_dev_excl(st->devnm);
+ dprintf("container (%s)\n", container);
+ fd = cfd;
+ }
+ if (cfd < 0) {
+ pr_err("Unable to open container "
+ "for %s\n", devname);
+ ret_val = 1;
+ goto Grow_continue_command_exit;
+ }
+
+ /* find in container array under reshape
+ */
+ ret_val = st->ss->load_container(st, cfd, NULL);
+ if (ret_val) {
+ pr_err("Cannot read superblock for %s\n",
+ devname);
+ ret_val = 1;
+ goto Grow_continue_command_exit;
+ }
+
+ cc = st->ss->container_content(st, subarray);
+ for (content = cc; content ; content = content->next) {
+ char *array;
+ int allow_reshape = 1;
+
+ if (content->reshape_active == 0)
+ continue;
+ /* The decision about array or container wide
+ * reshape is taken in Grow_continue based
+ * content->reshape_active state, therefore we
+ * need to check_reshape based on
+ * reshape_active and subarray name
+ */
+ if (content->array.state & (1<<MD_SB_BLOCK_VOLUME))
+ allow_reshape = 0;
+ if (content->reshape_active == CONTAINER_RESHAPE &&
+ (content->array.state
+ & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE)))
+ allow_reshape = 0;
+
+ if (!allow_reshape) {
+ pr_err("cannot continue reshape of an array"
+ " in container with unsupported"
+ " metadata: %s(%s)\n",
+ devname, container);
+ ret_val = 1;
+ goto Grow_continue_command_exit;
+ }
+
+ array = strchr(content->text_version+1, '/')+1;
+ mdstat = mdstat_by_subdev(array, container);
+ if (!mdstat)
+ continue;
+ if (mdstat->active == 0) {
+ pr_err("Skipping inactive array %s.\n",
+ mdstat->devnm);
+ free_mdstat(mdstat);
+ mdstat = NULL;
+ continue;
+ }
+ break;
+ }
+ if (!content) {
+ pr_err("Unable to determine reshaped "
+ "array for %s\n", devname);
+ ret_val = 1;
+ goto Grow_continue_command_exit;
+ }
+ fd2 = open_dev(mdstat->devnm);
+ if (fd2 < 0) {
+ pr_err("cannot open (%s)\n", mdstat->devnm);
+ ret_val = 1;
+ goto Grow_continue_command_exit;
+ }
+
+ sysfs_init(content, fd2, mdstat->devnm);
+
+ /* start mdmon in case it is not running
+ */
+ if (!mdmon_running(container))
+ start_mdmon(container);
+ ping_monitor(container);
+
+ if (mdmon_running(container))
+ st->update_tail = &st->updates;
+ else {
+ pr_err("No mdmon found. "
+ "Grow cannot continue.\n");
+ ret_val = 1;
+ goto Grow_continue_command_exit;
+ }
+ }
+
+ /* verify that array under reshape is started from
+ * correct position
+ */
+ if (verify_reshape_position(content, content->array.level) < 0) {
+ ret_val = 1;
+ goto Grow_continue_command_exit;
+ }
+
+ /* continue reshape
+ */
+ ret_val = Grow_continue(fd, st, content, backup_file, 1, 0);
+
+Grow_continue_command_exit:
+ if (fd2 > -1)
+ close(fd2);
+ if (cfd > -1)
+ close(cfd);
+ st->ss->free_super(st);
+ free_mdstat(mdstat);
+ sysfs_free(cc);
+ free(subarray);
+
+ return ret_val;
+}
+
+int Grow_continue(int mdfd, struct supertype *st, struct mdinfo *info,
+ char *backup_file, int forked, int freeze_reshape)
+{
+ int ret_val = 2;
+
+ if (!info->reshape_active)
+ return ret_val;
+
+ if (st->ss->external) {
+ int cfd = open_dev(st->container_devnm);
+
+ if (cfd < 0)
+ return 1;
+
+ st->ss->load_container(st, cfd, st->container_devnm);
+ close(cfd);
+ ret_val = reshape_container(st->container_devnm, NULL, mdfd,
+ st, info, 0, backup_file,
+ 0, forked,
+ 1 | info->reshape_active,
+ freeze_reshape);
+ } else
+ ret_val = reshape_array(NULL, mdfd, "array", st, info, 1,
+ NULL, INVALID_SECTORS,
+ backup_file, 0, forked,
+ 1 | info->reshape_active,
+ freeze_reshape);
+
+ return ret_val;
+}
+
+char *make_backup(char *name)
+{
+ char *base = "backup_file-";
+ int len;
+ char *fname;
+
+ len = strlen(MAP_DIR) + 1 + strlen(base) + strlen(name)+1;
+ fname = xmalloc(len);
+ sprintf(fname, "%s/%s%s", MAP_DIR, base, name);
+ return fname;
+}
+
+char *locate_backup(char *name)
+{
+ char *fl = make_backup(name);
+ struct stat stb;
+
+ if (stat(fl, &stb) == 0 &&
+ S_ISREG(stb.st_mode))
+ return fl;
+
+ free(fl);
+ return NULL;
+}