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imsm: auto layout 

In support of auto-layout:

1/ collect and merge all extents to find the largest common-start free region
2/ verify that we meet the "all volumes must use the same set of disks"
2/ mark the disks to be added in add_to_super_imsm_volume

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2009-02-24 18:45:57 -07:00
parent 18fde300fe
commit efb30e7f1e
1 changed files with 103 additions and 7 deletions
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110
super-intel.c
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@ -233,6 +233,7 @@ struct intel_super {
int fd;
int extent_cnt;
struct extent *e; /* for determining freespace @ create */
int raiddisk; /* slot to fill in autolayout */
} *disks;
struct dl *add; /* list of disks to add while mdmon active */
struct dl *missing; /* disks removed while we weren't looking */
@ -1119,7 +1120,11 @@ static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info)
struct intel_super *super = st->sb;
struct imsm_dev *dev = get_imsm_dev(super, super->current_vol);
struct imsm_map *map = get_imsm_map(dev, 0);
struct dl *dl;
for (dl = super->disks; dl; dl = dl->next)
if (dl->raiddisk == info->disk.raid_disk)
break;
info->container_member = super->current_vol;
info->array.raid_disks = map->num_members;
info->array.level = get_imsm_raid_level(map);
@ -1132,6 +1137,10 @@ static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info)
info->disk.major = 0;
info->disk.minor = 0;
if (dl) {
info->disk.major = dl->major;
info->disk.minor = dl->minor;
}
info->data_offset = __le32_to_cpu(map->pba_of_lba0);
info->component_size = __le32_to_cpu(map->blocks_per_member);
@ -2398,10 +2407,19 @@ static int add_to_super_imsm_volume(struct supertype *st, mdu_disk_info_t *dk,
return 1;
}
for (dl = super->disks; dl ; dl = dl->next)
if (dl->major == dk->major &&
dl->minor == dk->minor)
break;
if (fd == -1) {
/* we're doing autolayout so grab the pre-marked (in
* validate_geometry) raid_disk
*/
for (dl = super->disks; dl; dl = dl->next)
if (dl->raiddisk == dk->raid_disk)
break;
} else {
for (dl = super->disks; dl ; dl = dl->next)
if (dl->major == dk->major &&
dl->minor == dk->minor)
break;
}
if (!dl) {
fprintf(stderr, Name ": %s is not a member of the same container\n", devname);
@ -3052,6 +3070,78 @@ static int validate_geometry_imsm_volume(struct supertype *st, int level,
return 1;
}
static int reserve_space(struct supertype *st, int raiddisks,
unsigned long long size, int chunk,
unsigned long long *freesize)
{
struct intel_super *super = st->sb;
struct imsm_super *mpb = super->anchor;
struct dl *dl;
int i;
int extent_cnt;
struct extent *e;
unsigned long long maxsize;
unsigned long long minsize;
int cnt;
int used;
/* find the largest common start free region of the possible disks */
used = 0;
extent_cnt = 0;
cnt = 0;
for (dl = super->disks; dl; dl = dl->next) {
dl->raiddisk = -1;
if (dl->index >= 0)
used++;
/* don't activate new spares if we are orom constrained
* and there is already a volume active in the container
*/
if (super->orom && dl->index < 0 && mpb->num_raid_devs)
continue;
e = get_extents(super, dl);
if (!e)
continue;
for (i = 1; e[i-1].size; i++)
;
dl->e = e;
dl->extent_cnt = i;
extent_cnt += i;
cnt++;
}
maxsize = merge_extents(super, extent_cnt);
minsize = size;
if (size == 0)
minsize = chunk;
if (cnt < raiddisks ||
(super->orom && used && used != raiddisks) ||
maxsize < minsize) {
fprintf(stderr, Name ": not enough devices with space to create array.\n");
return 0; /* No enough free spaces large enough */
}
if (size == 0) {
size = maxsize;
if (chunk) {
size /= chunk;
size *= chunk;
}
}
cnt = 0;
for (dl = super->disks; dl; dl = dl->next)
if (dl->e)
dl->raiddisk = cnt++;
*freesize = size;
return 1;
}
static int validate_geometry_imsm(struct supertype *st, int level, int layout,
int raiddisks, int chunk, unsigned long long size,
char *dev, unsigned long long *freesize,
@ -3073,9 +3163,15 @@ static int validate_geometry_imsm(struct supertype *st, int level, int layout,
if (!dev) {
if (st->sb && freesize) {
/* Should do auto-layout here */
fprintf(stderr, Name ": IMSM does not support auto-layout yet\n");
return 0;
/* we are being asked to automatically layout a
* new volume based on the current contents of
* the container. If the the parameters can be
* satisfied reserve_space will record the disks,
* start offset, and size of the volume to be
* created. add_to_super and getinfo_super
* detect when autolayout is in progress.
*/
return reserve_space(st, raiddisks, size, chunk, freesize);
}
return 1;
}