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kernel / pub / scm / utils / mdadm / mdadm / mdadm-2 / . / Grow.c
blob: f9e6804219a3a651edbe7234fdcaedfff90bacb1 [file] [log] [blame]
/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2001-2006 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@cse.unsw.edu.au>
* Paper: Neil Brown
* School of Computer Science and Engineering
* The University of New South Wales
* Sydney, 2052
* Australia
*/
#include "mdadm.h"
#include "dlink.h"
#if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
#error no endian defined
#endif
#include "md_u.h"
#include "md_p.h"
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;
if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
fprintf(stderr, Name ": cannot get array info for %s\n", devname);
return 1;
}
st = super_by_fd(fd);
if (!st) {
fprintf(stderr, Name ": cannot handle arrays with superblock version %d\n", info.array.major_version);
return 1;
}
if (info.array.level != -1) {
fprintf(stderr, Name ": can only add devices to linear arrays\n");
return 1;
}
nfd = open(newdev, O_RDWR|O_EXCL);
if (nfd < 0) {
fprintf(stderr, Name ": cannot open %s\n", newdev);
return 1;
}
fstat(nfd, &stb);
if ((stb.st_mode & S_IFMT) != S_IFBLK) {
fprintf(stderr, Name ": %s is not a block device!\n", newdev);
close(nfd);
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;
disk.number = d;
if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
fprintf(stderr, Name ": cannot get device detail for device %d\n",
d);
return 1;
}
dv = map_dev(disk.major, disk.minor, 1);
if (!dv) {
fprintf(stderr, Name ": cannot find device file for device %d\n",
d);
return 1;
}
fd2 = dev_open(dv, O_RDWR);
if (!fd2) {
fprintf(stderr, Name ": cannot open device file %s\n", dv);
return 1;
}
st->ss->free_super(st);
if (st->ss->load_super(st, fd2, NULL)) {
fprintf(stderr, Name ": cannot find super block on %s\n", dv);
close(fd2);
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)) {
fprintf(stderr, Name ": Cannot store new superblock on %s\n",
newdev);
close(nfd);
return 1;
}
close(nfd);
if (ioctl(fd, ADD_NEW_DISK, &info.disk) != 0) {
fprintf(stderr, Name ": 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) {
fprintf(stderr, Name ": 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) {
fprintf(stderr, Name ": cannot get device detail for device %d\n",
d);
return 1;
}
dv = map_dev(disk.major, disk.minor, 1);
if (!dv) {
fprintf(stderr, Name ": cannot find device file for device %d\n",
d);
return 1;
}
fd2 = dev_open(dv, O_RDWR);
if (fd2 < 0) {
fprintf(stderr, Name ": cannot open device file %s\n", dv);
return 1;
}
if (st->ss->load_super(st, fd2, NULL)) {
fprintf(stderr, Name ": cannot find super block on %s\n", dv);
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)) {
fprintf(stderr, Name ": Cannot store new superblock on %s\n", dv);
close(fd2);
return 1;
}
close(fd2);
}
return 0;
}
int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force)
{
/*
* 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;
int major = BITMAP_MAJOR_HI;
int vers = md_get_version(fd);
unsigned long long bitmapsize, array_size;
if (vers < 9003) {
major = BITMAP_MAJOR_HOSTENDIAN;
#ifdef __BIG_ENDIAN
fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
" between different architectured. Consider upgrading the Linux kernel.\n");
#endif
}
if (ioctl(fd, GET_BITMAP_FILE, &bmf) != 0) {
if (errno == ENOMEM)
fprintf(stderr, Name ": Memory allocation failure.\n");
else
fprintf(stderr, Name ": bitmaps not supported by this kernel.\n");
return 1;
}
if (bmf.pathname[0]) {
if (strcmp(file,"none")==0) {
if (ioctl(fd, SET_BITMAP_FILE, -1)!= 0) {
fprintf(stderr, Name ": failed to remove bitmap %s\n",
bmf.pathname);
return 1;
}
return 0;
}
fprintf(stderr, Name ": %s already has a bitmap (%s)\n",
devname, bmf.pathname);
return 1;
}
if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
fprintf(stderr, Name ": cannot get array status for %s\n", devname);
return 1;
}
if (array.state & (1<<MD_SB_BITMAP_PRESENT)) {
if (strcmp(file, "none")==0) {
array.state &= ~(1<<MD_SB_BITMAP_PRESENT);
if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) {
fprintf(stderr, Name ": failed to remove internal bitmap.\n");
return 1;
}
return 0;
}
fprintf(stderr, Name ": Internal bitmap already present on %s\n",
devname);
return 1;
}
if (array.level <= 0) {
fprintf(stderr, Name ": 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) {
fprintf(stderr, Name ": 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);
if (!st) {
fprintf(stderr, Name ": Cannot understand version %d.%d\n",
array.major_version, array.minor_version);
return 1;
}
if (strcmp(file, "none") == 0) {
fprintf(stderr, Name ": no bitmap found on %s\n", devname);
return 1;
} else if (strcmp(file, "internal") == 0) {
int d;
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,
&chunk, delay, write_behind,
bitmapsize, 0, major)
)
st->ss->write_bitmap(st, fd2);
else {
fprintf(stderr, Name ": failed to create internal bitmap.\n");
close(fd2);
return 1;
}
}
close(fd2);
}
}
array.state |= (1<<MD_SB_BITMAP_PRESENT);
if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) {
fprintf(stderr, Name ": 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 &&
st->ss->load_super(st, fd2, NULL) == 0) {
close(fd2);
st->ss->uuid_from_super(st, uuid);
break;
}
close(fd2);
}
if (d == max_devs) {
fprintf(stderr, Name ": cannot find UUID for array!\n");
return 1;
}
if (CreateBitmap(file, force, (char*)uuid, chunk,
delay, write_behind, bitmapsize, major)) {
return 1;
}
bitmap_fd = open(file, O_RDWR);
if (bitmap_fd < 0) {
fprintf(stderr, Name ": weird: %s cannot be opened\n",
file);
return 1;
}
if (ioctl(fd, SET_BITMAP_FILE, bitmap_fd) < 0) {
fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
devname, strerror(errno));
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 1K form the end of the used space on the
* device.
* It if written after the backup is complete.
* It has the following structure.
*/
struct mdp_backup_super {
char magic[16]; /* md_backup_data-1 */
__u8 set_uuid[16];
__u64 mtime;
/* start/sizes in 512byte sectors */
__u64 devstart;
__u64 arraystart;
__u64 length;
__u32 sb_csum; /* csum of preceeding bytes. */
};
int 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);
}
int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
long long size,
int level, int layout, int chunksize, int raid_disks)
{
/* Make some changes in the shape of an array.
* The kernel must support the change.
* Different reshapes have subtly different meaning for different
* levels, so we need to check the current state of the array
* and go from there.
*/
struct mdu_array_info_s array;
char *c;
struct mdp_backup_super bsb;
struct supertype *st;
int nlevel, olevel;
int nchunk, ochunk;
int nlayout, olayout;
int ndisks, odisks;
int ndata, odata;
unsigned long long nstripe, ostripe, last_block;
int *fdlist;
unsigned long long *offsets;
int d, i, spares;
int nrdisks;
int err;
struct mdinfo *sra;
struct mdinfo *sd;
if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
fprintf(stderr, Name ": %s is not an active md array - aborting\n",
devname);
return 1;
}
c = map_num(pers, array.level);
if (c == NULL) c = "-unknown-";
switch(array.level) {
default: /* raid0, linear, multipath cannot be reconfigured */
fprintf(stderr, Name ": %s array %s cannot be reshaped.\n",
c, devname);
return 1;
case LEVEL_FAULTY: /* only 'layout' change is permitted */
if (size >= 0) {
fprintf(stderr, Name ": %s: Cannot change size of a 'faulty' array\n",
devname);
return 1;
}
if (level != UnSet && level != LEVEL_FAULTY) {
fprintf(stderr, Name ": %s: Cannot change RAID level of a 'faulty' array\n",
devname);
return 1;
}
if (chunksize || raid_disks) {
fprintf(stderr, Name ": %s: Cannot change chunksize or disks of a 'faulty' array\n",
devname);
return 1;
}
if (layout == UnSet)
return 0; /* nothing to do.... */
array.layout = layout;
if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
fprintf(stderr, Name ": Cannot set layout for %s: %s\n",
devname, strerror(errno));
return 1;
}
if (!quiet)
printf("layout for %s set to %d\n", devname, array.layout);
return 0;
case 1: /* raid_disks and size can each be changed. They are independant */
if (level != UnSet && level != 1) {
fprintf(stderr, Name ": %s: Cannot change RAID level of a RAID1 array.\n",
devname);
return 1;
}
if (chunksize || layout != UnSet) {
fprintf(stderr, Name ": %s: Cannot change chunk size of layout for a RAID1 array.\n",
devname);
return 1;
}
/* Each can trigger a resync/recovery which will block the
* other from happening. Later we could block
* resync for the duration via 'sync_action'...
*/
if (raid_disks > 0) {
array.raid_disks = raid_disks;
if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
fprintf(stderr, Name ": Cannot set raid-devices for %s: %s\n",
devname, strerror(errno));
return 1;
}
}
if (size >= 0) {
array.size = size;
if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
fprintf(stderr, Name ": Cannot set device size for %s: %s\n",
devname, strerror(errno));
return 1;
}
}
return 0;
case 4:
case 5:
case 6:
st = super_by_fd(fd);
/* size can be changed independently.
* layout/chunksize/raid_disks/level can be changed
* though the kernel may not support it all.
* If 'suspend_lo' is not present in devfs, then
* these cannot be changed.
*/
if (size >= 0) {
/* Cannot change other details as well.. */
if (layout != UnSet ||
chunksize != 0 ||
raid_disks != 0 ||
level != UnSet) {
fprintf(stderr, Name ": %s: Cannot change shape as well as size of a %s array.\n",
devname, c);
return 1;
}
array.size = size;
if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
fprintf(stderr, Name ": Cannot set device size/shape for %s: %s\n",
devname, strerror(errno));
return 1;
}
return 0;
}
/* Ok, just change the shape. This can be awkward.
* There are three possibilities.
* 1/ The array will shrink. We don't support this
* possibility. Maybe one day...
* 2/ The array will not change size. This is easy enough
* to do, but not reliably. If the process is aborted
* the array *will* be corrupted. So maybe we can allow
* this but only if the user is really certain. e.g.
* --really-risk-everything
* 3/ The array will grow. This can be reliably achieved.
* However the kernel's restripe routines will cheerfully
* overwrite some early data before it is safe. So we
* need to make a backup of the early parts of the array
* and be ready to restore it if rebuild aborts very early.
*
* We backup data by writing it to all spares (there must be
* at least 1, so even raid6->raid5 requires a spare to be
* present).
*
* So: we enumerate the devices in the array and
* make sure we can open all of them.
* Then we freeze the early part of the array and
* backup to the various spares.
* Then we request changes and start the reshape.
* Monitor progress until it has passed the danger zone.
* and finally invalidate the copied data and unfreeze the
* start of the array.
*
* Before we can do this we need to decide:
* - will the array grow? Just calculate size
* - how much needs to be saved: count stripes.
* - where to save data... good question.
*
*/
nlevel = olevel = array.level;
nchunk = ochunk = array.chunk_size;
nlayout = olayout = array.layout;
ndisks = odisks = array.raid_disks;
if (level != UnSet) nlevel = level;
if (chunksize) nchunk = chunksize;
if (layout != UnSet) nlayout = layout;
if (raid_disks) ndisks = raid_disks;
odata = odisks-1;
if (olevel == 6) odata--; /* number of data disks */
ndata = ndisks-1;
if (nlevel == 6) ndata--;
if (ndata < odata) {
fprintf(stderr, Name ": %s: Cannot reduce number of data disks (yet).\n",
devname);
return 1;
}
if (ndata == odata) {
fprintf(stderr, Name ": %s: Cannot reshape array without increasing size (yet).\n",
devname);
return 1;
}
/* Well, it is growing... so how much do we need to backup.
* Need to backup a full number of new-stripes, such that the
* last one does not over-write any place that it would be read
* from
*/
nstripe = ostripe = 0;
while (nstripe >= ostripe) {
nstripe += nchunk/512;
last_block = nstripe * ndata;
ostripe = last_block / odata / (ochunk/512) * (ochunk/512);
}
fprintf(stderr, Name ": Need to backup %lluK of critical "
"section..\n", last_block/2);
sra = sysfs_read(fd, 0,
GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|
GET_CACHE);
if (!sra) {
fprintf(stderr, Name ": %s: Cannot get array details from sysfs\n",
devname);
return 1;
}
if (last_block >= sra->component_size/2) {
fprintf(stderr, Name ": %s: Something wrong - reshape aborted\n",
devname);
return 1;
}
if (sra->array.spare_disks == 0 && backup_file == NULL) {
fprintf(stderr, Name ": %s: Cannot grow - need a spare or backup-file to backup critical section\n",
devname);
return 1;
}
nrdisks = array.nr_disks + sra->array.spare_disks;
/* Now we need to open all these devices so we can read/write.
*/
fdlist = malloc((1+nrdisks) * sizeof(int));
offsets = malloc((1+nrdisks) * sizeof(offsets[0]));
if (!fdlist || !offsets) {
fprintf(stderr, Name ": malloc failed: grow aborted\n");
return 1;
}
for (d=0; d <= nrdisks; d++)
fdlist[d] = -1;
d = array.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;
if (fdlist[sd->disk.raid_disk] < 0) {
fprintf(stderr, Name ": %s: cannot open component %s\n",
devname, dn?dn:"-unknown-");
goto abort;
}
} else {
/* spare */
char *dn = map_dev(sd->disk.major,
sd->disk.minor, 1);
fdlist[d] = dev_open(dn, O_RDWR);
offsets[d] = sd->data_offset;
if (fdlist[d]<0) {
fprintf(stderr, Name ": %s: cannot open component %s\n",
devname, dn?dn:"-unknown");
goto abort;
}
d++;
}
}
for (i=0 ; i<array.raid_disks; i++)
if (fdlist[i] < 0) {
fprintf(stderr, Name ": %s: failed to find device %d. Array might be degraded.\n"
" --grow aborted\n", devname, i);
goto abort;
}
spares = sra->array.spare_disks;
if (backup_file) {
fdlist[d] = open(backup_file, O_RDWR|O_CREAT|O_EXCL, S_IRUSR | S_IWUSR);
if (fdlist[d] < 0) {
fprintf(stderr, Name ": %s: cannot create backup file %s: %s\n",
devname, backup_file, strerror(errno));
goto abort;
}
offsets[d] = 8;
d++;
spares++;
}
if (fdlist[array.raid_disks] < 0) {
fprintf(stderr, Name ": %s: failed to find a spare and no backup-file given - --grow aborted\n",
devname);
goto abort;
}
/* Find a superblock */
if (st->ss->load_super(st, fdlist[0], NULL)) {
fprintf(stderr, Name ": %s: Cannot find a superblock\n",
devname);
goto abort;
}
memcpy(bsb.magic, "md_backup_data-1", 16);
st->ss->uuid_from_super(st, (int*)&bsb.set_uuid);
bsb.mtime = __cpu_to_le64(time(0));
bsb.arraystart = 0;
bsb.length = __cpu_to_le64(last_block);
/* Decide offset for the backup, llseek the spares, and write
* a leading superblock 4K earlier.
*/
for (i=array.raid_disks; i<d; i++) {
char buf[4096];
if (i==d-1 && backup_file) {
/* This is the backup file */
offsets[i] = 8;
} else
offsets[i] += sra->component_size - last_block - 8;
if (lseek64(fdlist[i], (offsets[i]<<9) - 4096, 0)
!= (offsets[i]<<9) - 4096) {
fprintf(stderr, Name ": could not seek...\n");
goto abort;
}
memset(buf, 0, sizeof(buf));
bsb.devstart = __cpu_to_le64(offsets[i]);
bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb));
memcpy(buf, &bsb, sizeof(bsb));
if (write(fdlist[i], buf, 4096) != 4096) {
fprintf(stderr, Name ": could not write leading superblock\n");
goto abort;
}
}
array.level = nlevel;
array.raid_disks = ndisks;
array.chunk_size = nchunk;
array.layout = nlayout;
if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
if (errno == ENOSPC) {
/* stripe cache is not big enough.
* It needs to be 4 times chunksize_size,
* and we assume pagesize is 4K
*/
if (sra->cache_size < 4 * (nchunk/4096)) {
sysfs_set_num(sra, NULL,
"stripe_cache_size",
4 * (nchunk/4096) +1);
if (ioctl(fd, SET_ARRAY_INFO,
&array) == 0)
goto ok;
}
}
fprintf(stderr, Name ": Cannot set device size/shape for %s: %s\n",
devname, strerror(errno));
goto abort;
}
ok: ;
/* suspend the relevant region */
sysfs_set_num(sra, NULL, "suspend_hi", 0); /* just in case */
if (sysfs_set_num(sra, NULL, "suspend_lo", 0) < 0 ||
sysfs_set_num(sra, NULL, "suspend_hi", last_block) < 0) {
fprintf(stderr, Name ": %s: failed to suspend device.\n",
devname);
goto abort_resume;
}
err = save_stripes(fdlist, offsets,
odisks, ochunk, olevel, olayout,
spares, fdlist+odisks,
0ULL, last_block*512);
/* abort if there was an error */
if (err < 0) {
fprintf(stderr, Name ": %s: failed to save critical region\n",
devname);
goto abort_resume;
}
for (i=odisks; i<d ; i++) {
bsb.devstart = __cpu_to_le64(offsets[i]);
bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb));
if (lseek64(fdlist[i], (offsets[i]+last_block)<<9, 0) < 0 ||
write(fdlist[i], &bsb, sizeof(bsb)) != sizeof(bsb) ||
fsync(fdlist[i]) != 0) {
fprintf(stderr, Name ": %s: fail to save metadata for critical region backups.\n",
devname);
goto abort_resume;
}
}
/* start the reshape happening */
if (sysfs_set_str(sra, NULL, "sync_action", "reshape") < 0) {
fprintf(stderr, Name ": %s: failed to initiate reshape\n",
devname);
goto abort_resume;
}
/* wait for reshape to pass the critical region */
while(1) {
unsigned long long comp;
if (sysfs_get_ll(sra, NULL, "sync_completed", &comp)<0) {
sleep(5);
break;
}
if (comp >= nstripe)
break;
sleep(1);
}
/* invalidate superblocks */
memset(&bsb, 0, sizeof(bsb));
for (i=odisks; i<d ; i++) {
lseek64(fdlist[i], (offsets[i]+last_block)<<9, 0);
if (write(fdlist[i], &bsb, sizeof(bsb)) < 0) {
fprintf(stderr, Name ": %s: failed to invalidate metadata for raid disk %d\n",
devname, i);
}
}
/* unsuspend. */
sysfs_set_num(sra, NULL, "suspend_lo", last_block);
for (i=0; i<d; i++)
if (fdlist[i] >= 0)
close(fdlist[i]);
free(fdlist);
free(offsets);
if (backup_file)
unlink(backup_file);
fprintf(stderr, Name ": ... critical section passed.\n");
break;
}
return 0;
abort_resume:
sysfs_set_num(sra, NULL, "suspend_lo", last_block);
abort:
for (i=0; i<array.nr_disks; i++)
if (fdlist[i] >= 0)
close(fdlist[i]);
free(fdlist);
free(offsets);
if (backup_file)
unlink(backup_file);
return 1;
}
/*
* 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 i, j;
int old_disks;
unsigned long long *offsets;
unsigned long long nstripe, ostripe, last_block;
int ndata, odata;
if (info->delta_disks < 0)
return 1; /* cannot handle a shrink */
if (info->new_level != info->array.level ||
info->new_layout != info->array.layout ||
info->new_chunk != info->array.chunk_size)
return 1; /* Can only handle change in disks */
old_disks = info->array.raid_disks - info->delta_disks;
for (i=old_disks-(backup_file?1:0); i<cnt; i++) {
struct mdinfo dinfo;
struct mdp_backup_super bsb;
char buf[4096];
int fd;
/* 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)
continue;
} else {
fd = fdlist[i];
if (fd < 0)
continue;
if (st->ss->load_super(st, fd, NULL))
continue;
st->ss->getinfo_super(st, &dinfo);
st->ss->free_super(st);
if (lseek64(fd,
(dinfo.data_offset + dinfo.component_size - 8) <<9,
0) < 0)
continue; /* Cannot seek */
}
if (read(fd, &bsb, sizeof(bsb)) != sizeof(bsb))
continue; /* Cannot read */
if (memcmp(bsb.magic, "md_backup_data-1", 16) != 0)
continue;
if (bsb.sb_csum != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb)))
continue; /* bad checksum */
if (memcmp(bsb.set_uuid,info->uuid, 16) != 0)
continue; /* Wrong uuid */
if (info->array.utime > __le64_to_cpu(bsb.mtime) + 3600 ||
info->array.utime < __le64_to_cpu(bsb.mtime))
continue; /* time stamp is too bad */
if (__le64_to_cpu(bsb.arraystart) != 0)
continue; /* Can only handle backup from start of array */
if (__le64_to_cpu(bsb.length) <
info->reshape_progress)
continue; /* No new data here */
if (lseek64(fd, __le64_to_cpu(bsb.devstart)*512, 0)< 0)
continue; /* Cannot seek */
/* There should be a duplicate backup superblock 4k before here */
if (lseek64(fd, -4096, 1) < 0 ||
read(fd, buf, 4096) != 4096 ||
memcmp(buf, &bsb, sizeof(bsb)) != 0)
continue; /* Cannot find leading superblock */
/* Now need the data offsets for all devices. */
offsets = malloc(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);
st->ss->free_super(st);
offsets[j] = dinfo.data_offset;
}
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,
0, __le64_to_cpu(bsb.length)*512)) {
/* didn't succeed, so giveup */
return 1;
}
/* Ok, so the data is restored. Let's update those superblocks. */
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);
dinfo.reshape_progress = __le64_to_cpu(bsb.length);
st->ss->update_super(st, &dinfo,
"_reshape_progress",
NULL,0, 0, NULL);
st->ss->store_super(st, fdlist[j]);
st->ss->free_super(st);
}
/* And we are done! */
return 0;
}
/* Didn't find any backup data, try to see if any
* was needed.
*/
nstripe = ostripe = 0;
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--;
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! */
return 1;
}