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Grow: allow metadata to indicate that changing data_offset not supported. 

If space_after and space_before are zero (the default) then assume that
metadata doesn't support changing data_offset.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2013-05-21 16:32:00 +10:00
parent 63c12c89d4
commit c4b26c643d
2 changed files with 13 additions and 0 deletions
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5
Grow.c
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@ -2179,6 +2179,11 @@ static int set_new_data_offset(struct mdinfo *sra, struct supertype *st,
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 (delta_disks < 0) {
/* Don't need any space as array is shrinking
* just move data_offset up by min

8
super1.c
View File

@ -953,6 +953,14 @@ static void getinfo_super1(struct supertype *st, struct mdinfo *info, char *map)
info->space_before = 0;
info->space_after = misc->device_size - data_size - info->data_offset;
}
if (info->space_before == 0 && info->space_after == 0) {
/* It will look like we don't support data_offset changes,
* be we do - it's just that there is no room.
* A change that reduced the number of devices should
* still be allowed, so set the otherwise useless value of '1'
*/
info->space_after = 1;
}
info->disk.raid_disk = -1;
switch(role) {