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-rw-r--r--super1.c181
1 files changed, 71 insertions, 110 deletions
diff --git a/super1.c b/super1.c
index f532bd2e..fcdb710b 100644
--- a/super1.c
+++ b/super1.c
@@ -1553,10 +1553,9 @@ static int write_init_super1(struct supertype *st)
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) {
@@ -1622,35 +1621,24 @@ static int write_init_super1(struct supertype *st)
* 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->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);
@@ -1661,70 +1649,37 @@ static int write_init_super1(struct supertype *st)
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:
@@ -1924,6 +1879,8 @@ static int load_super1(struct supertype *st, int fd, char *devname)
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)
@@ -1956,6 +1913,7 @@ static struct supertype *match_metadata_desc1(char *arg)
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++;
@@ -1997,6 +1955,7 @@ static __u64 avail_size1(struct supertype *st, __u64 devsize,
{
struct mdp_superblock_1 *super = st->sb;
int bmspace = 0;
+ int bbspace = 0;
if (devsize < 24)
return 0;
@@ -2010,16 +1969,19 @@ static __u64 avail_size1(struct supertype *st, __u64 devsize,
#endif
/* Allow space for bad block log */
if (super->bblog_size)
- devsize -= __le16_to_cpu(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;
@@ -2032,13 +1994,13 @@ static __u64 avail_size1(struct supertype *st, __u64 devsize,
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;
}
@@ -2274,6 +2236,7 @@ static int validate_geometry1(struct supertype *st, int level,
{
unsigned long long ldsize, devsize;
int bmspace;
+ unsigned long long headroom;
int fd;
if (level == LEVEL_CONTAINER) {
@@ -2287,6 +2250,10 @@ static int validate_geometry1(struct supertype *st, int level,
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)
@@ -2309,55 +2276,49 @@ static int validate_geometry1(struct supertype *st, int level,
/* creating: allow suitable space for bitmap */
bmspace = choose_bm_space(devsize);
- /* Allow space for bad block log */
- devsize -= 8;
- if (st->minor_version < 0)
- /* not specified, so time to set default */
- st->minor_version = 2;
-
- if (data_offset != INVALID_SECTORS)
- switch(st->minor_version) {
+ if (data_offset == INVALID_SECTORS)
+ data_offset = st->data_offset;
+ if (data_offset == INVALID_SECTORS)
+ switch (st->minor_version) {
case 0:
- *freesize = devsize - data_offset - 8*2;
- return 1;
+ data_offset = 0;
+ break;
case 1:
case 2:
- *freesize = devsize - data_offset;
- return 1;
- default:
- return 0;
- }
- else {
- devsize -= bmspace;
-
- if (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%
+ /* 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%
*/
- unsigned long long headroom = 128*1024*2;
+ headroom = 128*1024*2;
while ((headroom << 10) > devsize &&
(*chunk == 0 ||
headroom / 2 >= ((unsigned)(*chunk)*2)*2))
headroom >>= 1;
- devsize -= headroom;
- }
- switch(st->minor_version) {
- case 0:
- /* at end */
- *freesize = ((devsize - 8*2 ) & ~(4*2-1));
- break;
- case 1:
- /* at start, 4K for superblock and possible bitmap */
- *freesize = devsize - 4*2;
- break;
- case 2:
- /* 4k from start, 4K for superblock and possible bitmap */
- *freesize = devsize - (4+4)*2;
+ 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 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-29 11:39:00 +0000