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examine: allows to examine a disk metadata on non-metadata compliant systems 

Allow for loading metadata from disk attached to non-metadata compliant
system. Affects mdadm --examine and guess_super.

Added ignore_hw_compat in supertype to pass information to load_super
handler. If ignore_hw_compat is set the handler should load metadata
also from disks that do not comply with metadata requirements (i.e. disk is not
attached to native controller, etc).

Signed-off-by: Marcin Labun <marcin.labun@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Labun, Marcin 2011-03-23 12:04:46 +11:00 committed by NeilBrown
parent 246cebdb76
commit df3346e675
3 changed files with 10 additions and 1 deletions
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2
Examine.c
View File

@ -87,6 +87,7 @@ int Examine(struct mddev_dev *devlist, int brief, int export, int scan,
st = guess_super(fd);
if (st) {
err = 1;
st->ignore_hw_compat = 1;
if (!container)
err = st->ss->load_super(st, fd,
(brief||scan) ? NULL
@ -98,6 +99,7 @@ int Examine(struct mddev_dev *devlist, int brief, int export, int scan,
if (!err)
have_container = 1;
}
st->ignore_hw_compat = 0;
} else {
if (!brief) {
fprintf(stderr, Name ": No md superblock detected on %s.\n", devlist->devname);

6
mdadm.h
View File

@ -827,7 +827,11 @@ struct supertype {
int container_dev; /* devnum of container */
void *sb;
void *info;
int ignore_hw_compat; /* used to inform metadata handlers that it should ignore
HW/firmware related incompatability to load metadata.
Used when examining metadata to display content of disk
when user has no hw/firmare compatible system.
*/
struct metadata_update *updates;
struct metadata_update **update_tail;

3
util.c
View File

@ -1196,6 +1196,7 @@ struct supertype *guess_super_type(int fd, enum guess_types guess_type)
if (guess_type == guess_partitions && ss->add_to_super != NULL)
continue;
memset(st, 0, sizeof(*st));
st->ignore_hw_compat = 1;
rv = ss->load_super(st, fd, NULL);
if (rv == 0) {
struct mdinfo info;
@ -1211,9 +1212,11 @@ struct supertype *guess_super_type(int fd, enum guess_types guess_type)
if (bestsuper != -1) {
int rv;
memset(st, 0, sizeof(*st));
st->ignore_hw_compat = 1;
rv = superlist[bestsuper]->load_super(st, fd, NULL);
if (rv == 0) {
superlist[bestsuper]->free_super(st);
st->ignore_hw_compat = 0;
return st;
}
}