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md/md-llbitmap: refuse reshape while llbitmap still needs sync

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Reject reshape when llbitmap still contains NeedSync or Syncing bits.

This keeps reshape from starting until the current llbitmap state has
been reconciled.

Tested-by: Mykola Marzhan <mykola@meshstor.io>
Link: https://patch.msgid.link/20260802195038.164272-19-yukuai@kernel.org
Signed-off-by: Yu Kuai <yukuai@fygo.io>
This commit is contained in:
Yu Kuai 2026-08-03 03:50:27 +08:00
parent b094fa9d32
commit 807757d4c3
1 changed files with 24 additions and 0 deletions
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24
drivers/md/md-llbitmap.c
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@ -1718,6 +1718,29 @@ static void llbitmap_dirty_bits(struct mddev *mddev, unsigned long s,
llbitmap_state_machine(mddev->bitmap, s, e, BitmapActionStartwrite);
}
static int llbitmap_reshape_can_start(struct mddev *mddev)
{
struct llbitmap *llbitmap = mddev->bitmap;
unsigned long chunk;
int ret = 0;
if (!llbitmap)
return 0;
mutex_lock(&mddev->bitmap_info.mutex);
for (chunk = 0; chunk < llbitmap->chunks; chunk++) {
enum llbitmap_state state = llbitmap_read(llbitmap, chunk);
if (state == BitNeedSync || state == BitSyncing) {
ret = -EBUSY;
break;
}
}
mutex_unlock(&mddev->bitmap_info.mutex);
return ret;
}
static void llbitmap_reshape_finish(struct mddev *mddev)
{
struct llbitmap *llbitmap = mddev->bitmap;
@ -2034,6 +2057,7 @@ static struct bitmap_operations llbitmap_ops = {
.dirty_bits = llbitmap_dirty_bits,
.prepare_range = llbitmap_prepare_range,
.reshape_finish = llbitmap_reshape_finish,
.reshape_can_start = llbitmap_reshape_can_start,
.write_all = llbitmap_write_all,
.groups = md_llbitmap_groups,