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md-cluster: always setup in-memory bitmap 

The in-memory bitmap for raid is allocated on demand,
then for cluster scenario, it is possible that slave
node which received RESYNCING message doesn't have the
in-memory bitmap when master node is perform resyncing,
so we can't make bitmap is match up well among each
nodes.

So for cluster scenario, we need always preserve the
bitmap, and ensure the page will not be freed. And a
no_hijack flag is introduced to both bitmap_checkpage
and bitmap_get_counter, which makes cluster raid returns
fail once allocate failed.

And the next patch is relied on this change since it
keeps sync bitmap among each nodes during resyncing
stage.

Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Guoqing Jiang 2016-05-02 11:50:11 -04:00 committed by Shaohua Li
parent a578183ed9
commit c9d6503228
1 changed files with 35 additions and 2 deletions
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37
drivers/md/bitmap.c
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@ -46,7 +46,7 @@ static inline char *bmname(struct bitmap *bitmap)
* allocated while we're using it
*/
static int bitmap_checkpage(struct bitmap_counts *bitmap,
unsigned long page, int create)
unsigned long page, int create, int no_hijack)
__releases(bitmap->lock)
__acquires(bitmap->lock)
{
@ -90,6 +90,9 @@ __acquires(bitmap->lock)
if (mappage == NULL) {
pr_debug("md/bitmap: map page allocation failed, hijacking\n");
/* We don't support hijack for cluster raid */
if (no_hijack)
return -ENOMEM;
/* failed - set the hijacked flag so that we can use the
* pointer as a counter */
if (!bitmap->bp[page].map)
@ -1321,7 +1324,7 @@ __acquires(bitmap->lock)
sector_t csize;
int err;
err = bitmap_checkpage(bitmap, page, create);
err = bitmap_checkpage(bitmap, page, create, 0);
if (bitmap->bp[page].hijacked ||
bitmap->bp[page].map == NULL)
@ -2032,6 +2035,36 @@ int bitmap_resize(struct bitmap *bitmap, sector_t blocks,
chunks << chunkshift);
spin_lock_irq(&bitmap->counts.lock);
/* For cluster raid, need to pre-allocate bitmap */
if (mddev_is_clustered(bitmap->mddev)) {
unsigned long page;
for (page = 0; page < pages; page++) {
ret = bitmap_checkpage(&bitmap->counts, page, 1, 1);
if (ret) {
unsigned long k;
/* deallocate the page memory */
for (k = 0; k < page; k++) {
if (new_bp[k].map)
kfree(new_bp[k].map);
}
/* restore some fields from old_counts */
bitmap->counts.bp = old_counts.bp;
bitmap->counts.pages = old_counts.pages;
bitmap->counts.missing_pages = old_counts.pages;
bitmap->counts.chunkshift = old_counts.chunkshift;
bitmap->counts.chunks = old_counts.chunks;
bitmap->mddev->bitmap_info.chunksize = 1 << (old_counts.chunkshift +
BITMAP_BLOCK_SHIFT);
blocks = old_counts.chunks << old_counts.chunkshift;
pr_err("Could not pre-allocate in-memory bitmap for cluster raid\n");
break;
} else
bitmap->counts.bp[page].count += 1;
}
}
for (block = 0; block < blocks; ) {
bitmap_counter_t *bmc_old, *bmc_new;
int set;