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

super1: add new_offset field. 

The 'new_offset' is used for reshaping to avoid the need
for a backup file.

For now we only report the value when it is set.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2012-10-04 16:34:21 +10:00
parent 40c9a66a5c
commit 8fe1c44f82
1 changed files with 26 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
super1.c
View File

@ -58,7 +58,10 @@ struct mdp_superblock_1 {
__u32 delta_disks; /* change in number of raid_disks */
__u32 new_layout; /* new layout */
__u32 new_chunk; /* new chunk size (bytes) */
__u8 pad1[128-124]; /* set to 0 when written */
__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.
*/
/* constant this-device information - 64 bytes */
__u64 data_offset; /* sector start of data, often 0 */
@ -112,8 +115,23 @@ struct misc_dev_info {
*/
#define MD_FEATURE_RESHAPE_ACTIVE 4
#define MD_FEATURE_BAD_BLOCKS 8 /* badblock list is not empty */
#define MD_FEATURE_ALL (1|2|4|8)
#define MD_FEATURE_REPLACEMENT 16 /* This device is replacing an
* active device with same 'role'.
* 'recovery_offset' is also set.
*/
#define MD_FEATURE_RESHAPE_BACKWARDS 32 /* Reshape doesn't change number
* of devices, but is going
* backwards anyway.
*/
#define MD_FEATURE_NEW_OFFSET 64 /* new_offset must be honoured */
#define MD_FEATURE_ALL (MD_FEATURE_BITMAP_OFFSET \
|MD_FEATURE_RECOVERY_OFFSET \
|MD_FEATURE_RESHAPE_ACTIVE \
|MD_FEATURE_BAD_BLOCKS \
|MD_FEATURE_REPLACEMENT \
|MD_FEATURE_RESHAPE_BACKWARDS \
|MD_FEATURE_NEW_OFFSET \
)
#ifndef offsetof
#define offsetof(t,f) ((size_t)&(((t*)0)->f))
@ -309,6 +327,11 @@ static void examine_super1(struct supertype *st, char *homehost)
if (sb->data_offset)
printf(" Data Offset : %llu sectors\n",
(unsigned long long)__le64_to_cpu(sb->data_offset));
if (sb->new_offset) {
unsigned long long offset = __le64_to_cpu(sb->data_offset);
offset += (signed)(int32_t)__le32_to_cpu(sb->new_offset);
printf(" New Offset : %llu sectors\n", offset);
}
printf(" Super Offset : %llu sectors\n",
(unsigned long long)__le64_to_cpu(sb->super_offset));
if (__le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)