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MD: add sync_super to mddev_t struct 

Add the 'sync_super' function pointer to MD array structure (struct mddev_s)

If device-mapper (dm-raid.c) is to define its own on-disk superblock and be
able to load it, there must still be a way for MD to initiate superblock
updates.  The simplest way to make this happen is to provide a pointer in
the MD array structure that can be set by device-mapper (or other module)
with a function to do this.  If the function has been set, it will be used;
otherwise, the method with be looked up via 'super_types' as usual.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Jonathan Brassow 2011-06-07 17:51:30 -05:00 committed by NeilBrown
parent 1ed7242e59
commit 076f968b37
2 changed files with 14 additions and 2 deletions
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15
drivers/md/md.c
View File

@ -1753,6 +1753,18 @@ static struct super_type super_types[] = {
},
};
static void sync_super(mddev_t *mddev, mdk_rdev_t *rdev)
{
if (mddev->sync_super) {
mddev->sync_super(mddev, rdev);
return;
}
BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
super_types[mddev->major_version].sync_super(mddev, rdev);
}
static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
{
mdk_rdev_t *rdev, *rdev2;
@ -2171,8 +2183,7 @@ static void sync_sbs(mddev_t * mddev, int nospares)
/* Don't update this superblock */
rdev->sb_loaded = 2;
} else {
super_types[mddev->major_version].
sync_super(mddev, rdev);
sync_super(mddev, rdev);
rdev->sb_loaded = 1;
}
}

1
drivers/md/md.h
View File

@ -330,6 +330,7 @@ struct mddev_s
atomic_t flush_pending;
struct work_struct flush_work;
struct work_struct event_work; /* used by dm to report failure event */
void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
};