Martchus
/
mdadm
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

super1: put bitmap on a 4K boundary when possible. 

Some devices have 4K sector sizes.  So try to align the bitmap
on a 4K boundary.
This isn't possible when hot-adding a bitmap, but will be once
we add support for configuring the bitmap via sysfs.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2010-02-24 11:31:48 +11:00
parent b179246f4f
commit a31128d2de
1 changed files with 7 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
super1.c
View File

@ -1445,8 +1445,8 @@ add_internal_bitmap1(struct supertype *st,
switch(st->minor_version) {
case 0:
/* either 3K after the superblock, or some amount of space
* before.
/* either 3K after the superblock (when hot-add),
* or some amount of space before.
*/
if (may_change) {
/* We are creating array, so we *know* how much room has
@ -1454,11 +1454,6 @@ add_internal_bitmap1(struct supertype *st,
*/
offset = 0;
room = choose_bm_space(__le64_to_cpu(sb->size));
if (room == 4*2) {
/* make it 3K after the superblock */
room = 3*2;
offset = 2;
}
} else {
room = __le64_to_cpu(sb->super_offset)
- __le64_to_cpu(sb->data_offset)
@ -1519,8 +1514,12 @@ add_internal_bitmap1(struct supertype *st,
return 0;
if (offset == 0) {
/* start bitmap on a 4K boundary with enough space for
* the bitmap
*/
bits = (size*512) / chunk + 1;
room = ((bits+7)/8 + sizeof(bitmap_super_t) +511)/512;
room = ((bits+7)/8 + sizeof(bitmap_super_t) +4095)/4096;
room *= 8; /* convert 4K blocks to sectors */
offset = -room;
}