* Email: <neilb@suse.de>
*/
+#include <stddef.h>
#include "mdadm.h"
/*
* The version-1 superblock :
__u64 reshape_position; /* next address in array-space for reshape */
__u32 delta_disks; /* change in number of raid_disks */
__u32 new_layout; /* new layout */
- __u32 new_chunk; /* new chunk size (bytes) */
+ __u32 new_chunk; /* new chunk size (sectors) */
__u32 new_offset; /* signed number to add to data_offset in new
* layout. 0 == no-change. This can be
* different on each device in the array.
|MD_FEATURE_NEW_OFFSET \
)
-#ifndef offsetof
-#define offsetof(t,f) ((size_t)&(((t*)0)->f))
-#endif
static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
{
unsigned int disk_csum, csum;
pr_err("No active reshape to revert on %s\n",
devname);
else {
- rv = 0;
__u32 temp;
- sb->raid_disks = __cpu_to_le32(__le32_to_cpu(sb->raid_disks) +
+ unsigned long long reshape_sectors;
+ long reshape_chunk;
+ rv = 0;
+ /* reshape_position is a little messy.
+ * Its value must be a multiple of the larger
+ * chunk size, and of the "after" data disks.
+ * So when reverting we need to change it to
+ * be a multiple of the new "after" data disks,
+ * which is the old "before".
+ * If it isn't already a multiple of 'before',
+ * the only thing we could do would be
+ * copy some block around on the disks, which
+ * is easy to get wrong.
+ * So we reject a revert-reshape unless the
+ * alignment is good.
+ */
+ if (__le32_to_cpu(sb->level) >= 4 &&
+ __le32_to_cpu(sb->level) <= 6) {
+ reshape_sectors = __le64_to_cpu(sb->reshape_position);
+ reshape_chunk = __le32_to_cpu(sb->new_chunk);
+ reshape_chunk *= __le32_to_cpu(sb->raid_disks) - __le32_to_cpu(sb->delta_disks) -
+ (__le32_to_cpu(sb->level)==6 ? 2 : 1);
+ if (reshape_sectors % reshape_chunk) {
+ pr_err("Reshape position is not suitably aligned.\n");
+ pr_err("Try normal assembly and stop again\n");
+ return -2;
+ }
+ }
+ sb->raid_disks = __cpu_to_le32(__le32_to_cpu(sb->raid_disks) -
__le32_to_cpu(sb->delta_disks));
if (sb->delta_disks == 0)
sb->feature_map ^= __cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
sb->chunksize = temp;
if (sb->feature_map & __cpu_to_le32(MD_FEATURE_NEW_OFFSET)) {
- sb->data_offset = __cpu_to_le64(__le64_to_cpu(sb->data_offset) +
- (long)(int32_t)__le32_to_cpu(sb->new_offset));
- sb->new_offset = __cpu_to_le32(-(int32_t)__le32_to_cpu(sb->new_offset));
+ long offset_delta = (int32_t)__le32_to_cpu(sb->new_offset);
+ sb->data_offset = __cpu_to_le64(__le64_to_cpu(sb->data_offset) + offset_delta);
+ sb->new_offset = __cpu_to_le32(-offset_delta);
+ sb->data_size = __cpu_to_le64(__le64_to_cpu(sb->data_size) - offset_delta);
}
}
} else if (strcmp(update, "_reshape_progress")==0)
int rfd;
int rv = 0;
unsigned long long bm_space;
- unsigned long long reserved;
struct devinfo *di;
unsigned long long dsize, array_size;
- unsigned long long sb_offset, headroom;
+ unsigned long long sb_offset;
unsigned long long data_offset;
for (di = st->info; di; di = di->next) {
* 0: At least 8K, but less than 12K, from end of device
* 1: At start of device
* 2: 4K from start of device.
- * Depending on the array size, we might leave extra space
- * for a bitmap.
- * Also leave 4K for bad-block log.
+ * data_offset has already been set.
*/
array_size = __le64_to_cpu(sb->size);
/* work out how much space we left for a bitmap,
* Add 8 sectors for bad block log */
bm_space = choose_bm_space(array_size) + 8;
- /* We try to leave 0.1% at the start for reshape
- * operations, but limit this to 128Meg (0.1% of 10Gig)
- * which is plenty for efficient reshapes
- * However we make it at least 2 chunks as one chunk
- * is minimum needed for reshape.
- */
- headroom = 128 * 1024 * 2;
- while (headroom << 10 > array_size &&
- headroom/2 >= __le32_to_cpu(sb->chunksize) * 2)
- headroom >>= 1;
-
data_offset = di->data_offset;
+ if (data_offset == INVALID_SECTORS)
+ data_offset = st->data_offset;
switch(st->minor_version) {
case 0:
+ if (data_offset == INVALID_SECTORS)
+ data_offset = 0;
sb_offset = dsize;
sb_offset -= 8*2;
sb_offset &= ~(4*2-1);
+ sb->data_offset = __cpu_to_le64(data_offset);
sb->super_offset = __cpu_to_le64(sb_offset);
- if (data_offset == INVALID_SECTORS)
- sb->data_offset = 0;
if (sb_offset < array_size + bm_space)
bm_space = sb_offset - array_size;
sb->data_size = __cpu_to_le64(sb_offset - bm_space);
break;
case 1:
sb->super_offset = __cpu_to_le64(0);
- if (data_offset == INVALID_SECTORS) {
- reserved = bm_space + 4*2;
- if (reserved < headroom)
- reserved = headroom;
- if (reserved + array_size > dsize)
- reserved = dsize - array_size;
- /* Try for multiple of 1Meg so it is nicely aligned */
- #define ONE_MEG (2*1024)
- if (reserved > ONE_MEG)
- reserved = (reserved/ONE_MEG) * ONE_MEG;
-
- /* force 4K alignment */
- reserved &= ~7ULL;
-
- } else
- reserved = data_offset;
-
- sb->data_offset = __cpu_to_le64(reserved);
- sb->data_size = __cpu_to_le64(dsize - reserved);
- if (reserved >= 8 + 32*2 + 8) {
+ if (data_offset == INVALID_SECTORS)
+ data_offset = 16;
+
+ sb->data_offset = __cpu_to_le64(data_offset);
+ sb->data_size = __cpu_to_le64(dsize - data_offset);
+ if (data_offset >= 8 + 32*2 + 8) {
sb->bblog_size = __cpu_to_le16(8);
sb->bblog_offset = __cpu_to_le32(8 + 32*2);
- } else if (reserved >= 16) {
+ } else if (data_offset >= 16) {
sb->bblog_size = __cpu_to_le16(8);
- sb->bblog_offset = __cpu_to_le32(reserved-8);
+ sb->bblog_offset = __cpu_to_le32(data_offset-8);
}
break;
case 2:
sb_offset = 4*2;
- sb->super_offset = __cpu_to_le64(4*2);
- if (data_offset == INVALID_SECTORS) {
- if (4*2 + 4*2 + bm_space + array_size
- > dsize)
- bm_space = dsize - array_size
- - 4*2 - 4*2;
-
- reserved = bm_space + 4*2 + 4*2;
- if (reserved < headroom)
- reserved = headroom;
- if (reserved + array_size > dsize)
- reserved = dsize - array_size;
- /* Try for multiple of 1Meg so it is nicely aligned */
- #define ONE_MEG (2*1024)
- if (reserved > ONE_MEG)
- reserved = (reserved/ONE_MEG) * ONE_MEG;
-
- /* force 4K alignment */
- reserved &= ~7ULL;
-
- } else
- reserved = data_offset;
-
- sb->data_offset = __cpu_to_le64(reserved);
- sb->data_size = __cpu_to_le64(dsize - reserved);
- if (reserved >= 16 + 32*2 + 8) {
+ sb->super_offset = __cpu_to_le64(sb_offset);
+ if (data_offset == INVALID_SECTORS)
+ data_offset = 24;
+
+ sb->data_offset = __cpu_to_le64(data_offset);
+ sb->data_size = __cpu_to_le64(dsize - data_offset);
+ if (data_offset >= 16 + 32*2 + 8) {
sb->bblog_size = __cpu_to_le16(8);
sb->bblog_offset = __cpu_to_le32(8 + 32*2);
- } else if (reserved >= 16+16) {
+ } else if (data_offset >= 16+16) {
sb->bblog_size = __cpu_to_le16(8);
/* '8' sectors for the bblog, and another '8'
* because we want offset from superblock, not
* start of device.
*/
- sb->bblog_offset = __cpu_to_le32(reserved-8-8);
+ sb->bblog_offset = __cpu_to_le32(data_offset-8-8);
}
break;
default:
misc = (struct misc_dev_info*) (((char*)super)+MAX_SB_SIZE+BM_SUPER_SIZE);
misc->device_size = dsize;
+ if (st->data_offset == INVALID_SECTORS)
+ st->data_offset = __le64_to_cpu(super->data_offset);
/* Now check on the bitmap superblock */
if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
st->ss = &super1;
st->max_devs = MAX_DEVS;
st->sb = NULL;
+ st->data_offset = INVALID_SECTORS;
/* leading zeros can be safely ignored. --detail generates them. */
while (*arg == '0')
arg++;
* superblock type st, and reserving 'reserve' sectors for
* a possible bitmap
*/
-static __u64 _avail_size1(struct supertype *st, __u64 devsize,
- unsigned long long data_offset, int chunksize)
+static __u64 avail_size1(struct supertype *st, __u64 devsize,
+ unsigned long long data_offset)
{
struct mdp_superblock_1 *super = st->sb;
int bmspace = 0;
+ int bbspace = 0;
if (devsize < 24)
return 0;
- if (super == NULL)
- /* creating: allow suitable space for bitmap */
- bmspace = choose_bm_space(devsize);
#ifndef MDASSEMBLE
- else if (__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
+ if (__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
/* hot-add. allow for actual size of bitmap */
struct bitmap_super_s *bsb;
bsb = (struct bitmap_super_s *)(((char*)super)+MAX_SB_SIZE);
}
#endif
/* Allow space for bad block log */
- if (super && super->bblog_size)
- devsize -= __le16_to_cpu(super->bblog_size);
- else
- devsize -= 8;
+ if (super->bblog_size)
+ bbspace = __le16_to_cpu(super->bblog_size);
if (st->minor_version < 0)
/* not specified, so time to set default */
st->minor_version = 2;
+ if (data_offset == INVALID_SECTORS)
+ data_offset = st->data_offset;
+
if (data_offset != INVALID_SECTORS)
switch(st->minor_version) {
case 0:
- return devsize - data_offset - 8*2;
+ return devsize - data_offset - 8*2 - bbspace;
case 1:
case 2:
return devsize - data_offset;
devsize -= bmspace;
- if (super == NULL && st->minor_version > 0) {
- /* haven't committed to a size yet, so allow some
- * slack for space for reshape.
- * Limit slack to 128M, but aim for about 0.1%
- */
- unsigned long long headroom = 128*1024*2;
- while ((headroom << 10) > devsize &&
- (chunksize == 0 ||
- headroom / 2 >= ((unsigned)chunksize*2)*2))
- headroom >>= 1;
- devsize -= headroom;
- }
switch(st->minor_version) {
case 0:
/* at end */
- return ((devsize - 8*2 ) & ~(4*2-1));
+ return ((devsize - 8*2 - bbspace ) & ~(4*2-1));
case 1:
/* at start, 4K for superblock and possible bitmap */
- return devsize - 4*2;
+ return devsize - 4*2 - bbspace;
case 2:
/* 4k from start, 4K for superblock and possible bitmap */
- return devsize - (4+4)*2;
+ return devsize - (4+4)*2 - bbspace;
}
return 0;
}
-static __u64 avail_size1(struct supertype *st, __u64 devsize,
- unsigned long long data_offset)
-{
- return _avail_size1(st, devsize, data_offset, 0);
-}
static int
add_internal_bitmap1(struct supertype *st,
char *subdev, unsigned long long *freesize,
int verbose)
{
- unsigned long long ldsize;
+ unsigned long long ldsize, devsize;
+ int bmspace;
+ unsigned long long headroom;
int fd;
if (level == LEVEL_CONTAINER) {
pr_err("1.x metadata does not support containers\n");
return 0;
}
- if (chunk && *chunk == UnSet)
+ if (*chunk == UnSet)
*chunk = DEFAULT_CHUNK;
if (!subdev)
return 1;
+ if (st->minor_version < 0)
+ /* not specified, so time to set default */
+ st->minor_version = 2;
+
fd = open(subdev, O_RDONLY|O_EXCL, 0);
if (fd < 0) {
if (verbose)
}
close(fd);
- *freesize = _avail_size1(st, ldsize >> 9, data_offset, *chunk);
+ devsize = ldsize >> 9;
+ if (devsize < 24) {
+ *freesize = 0;
+ return 0;
+ }
+
+ /* creating: allow suitable space for bitmap */
+ bmspace = choose_bm_space(devsize);
+
+ if (data_offset == INVALID_SECTORS)
+ data_offset = st->data_offset;
+ if (data_offset == INVALID_SECTORS)
+ switch (st->minor_version) {
+ case 0:
+ data_offset = 0;
+ break;
+ case 1:
+ case 2:
+ /* Choose data offset appropriate for this device
+ * and use as default for whole array.
+ * The data_offset must allow for bitmap space
+ * and base metadata, should allow for some headroom
+ * for reshape, and should be rounded to multiple
+ * of 1M.
+ * Headroom is limited to 128M, but aim for about 0.1%
+ */
+ headroom = 128*1024*2;
+ while ((headroom << 10) > devsize &&
+ (*chunk == 0 ||
+ headroom / 2 >= ((unsigned)(*chunk)*2)*2))
+ headroom >>= 1;
+ data_offset = 12*2 + bmspace + headroom;
+ #define ONE_MEG (2*1024)
+ if (data_offset > ONE_MEG)
+ data_offset = (data_offset / ONE_MEG) * ONE_MEG;
+ break;
+ }
+ if (st->data_offset == INVALID_SECTORS)
+ st->data_offset = data_offset;
+ switch(st->minor_version) {
+ case 0: /* metadata at end. Round down and subtract space to reserve */
+ devsize = (devsize & ~(4ULL*2-1));
+ /* space for metadata, bblog, bitmap */
+ devsize -= 8*2 + 8 + bmspace;
+ break;
+ case 1:
+ case 2:
+ devsize -= data_offset;
+ break;
+ }
+ *freesize = devsize;
return 1;
}
#endif /* MDASSEMBLE */
projects / thirdparty / mdadm.git / blobdiff