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Add uuid support for super-intel. 

'imsm' does not provide any real uuid, so we synthesise one
from various stable bits of the superblock.
This commit is contained in:
NeilBrown 2008-09-18 16:07:32 +10:00
parent 9362c1c80c
commit 51006d8586
2 changed files with 47 additions and 7 deletions
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7
super-ddf.c
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@ -1180,11 +1180,14 @@ static void uuid_from_super_ddf(struct supertype *st, int uuid[4])
* uuid to put into bitmap file (Create, Grow)
* uuid for backup header when saving critical section (Grow)
* comparing uuids when re-adding a device into an array
* In these cases the uuid required is that of the data-array,
* not the device-set.
* uuid to recognise same set when adding a missing device back
* to an array. This is a uuid for the device-set.
*
* For each of these we can make do with a truncated
* or hashed uuid rather than the original, as long as
* everyone agrees.
* In each case the uuid required is that of the data-array,
* not the device-set.
* In the case of SVD we assume the BVD is of interest,
* though that might be the case if a bitmap were made for
* a mirrored SVD - worry about that later.

47
super-intel.c
View File

@ -17,8 +17,10 @@
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define HAVE_STDINT_H 1
#include "mdadm.h"
#include "mdmon.h"
#include "sha1.h"
#include <values.h>
#include <scsi/sg.h>
#include <ctype.h>
@ -583,13 +585,46 @@ static int match_home_imsm(struct supertype *st, char *homehost)
static void uuid_from_super_imsm(struct supertype *st, int uuid[4])
{
/* imsm does not track uuid's so just make sure we never return
* the same value twice to break uuid matching in Manage_subdevs
* FIXME what about the use of uuid's with bitmap's?
/* The uuid returned here is used for:
* uuid to put into bitmap file (Create, Grow)
* uuid for backup header when saving critical section (Grow)
* comparing uuids when re-adding a device into an array
* In these cases the uuid required is that of the data-array,
* not the device-set.
* uuid to recognise same set when adding a missing device back
* to an array. This is a uuid for the device-set.
*
* For each of these we can make do with a truncated
* or hashed uuid rather than the original, as long as
* everyone agrees.
* In each case the uuid required is that of the data-array,
* not the device-set.
*/
static int dummy_id = 0;
/* imsm does not track uuid's so we synthesis one using sha1 on
* - The signature (Which is constant for all imsm array, but no matter)
* - the family_num of the container
* - the index number of the volume
* - the 'serial' number of the volume.
* Hopefully these are all constant.
*/
struct intel_super *super = st->sb;
uuid[0] = dummy_id++;
char buf[20];
struct sha1_ctx ctx;
struct imsm_dev *dev = NULL;
sha1_init_ctx(&ctx);
sha1_process_bytes(super->anchor->sig, MAX_SIGNATURE_LENGTH, &ctx);
sha1_process_bytes(&super->anchor->family_num, sizeof(__u32), &ctx);
if (super->current_vol >= 0)
dev = get_imsm_dev(super, super->current_vol);
if (dev) {
__u32 vol = super->current_vol;
sha1_process_bytes(&vol, sizeof(vol), &ctx);
sha1_process_bytes(dev->volume, MAX_RAID_SERIAL_LEN, &ctx);
}
sha1_finish_ctx(&ctx, buf);
memcpy(uuid, buf, 4*4);
}
#if 0
@ -673,6 +708,7 @@ static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info)
devnum2devname(st->container_dev),
info->container_member);
info->safe_mode_delay = 4000; /* 4 secs like the Matrix driver */
uuid_from_super_imsm(st, info->uuid);
}
@ -722,6 +758,7 @@ static void getinfo_super_imsm(struct supertype *st, struct mdinfo *info)
info->disk.state |= s & FAILED_DISK ? (1 << MD_DISK_FAULTY) : 0;
info->disk.state |= s & USABLE_DISK ? (1 << MD_DISK_SYNC) : 0;
}
uuid_from_super_imsm(st, info->uuid);
}
static int update_super_imsm(struct supertype *st, struct mdinfo *info,