md/bitmap: make bitmap bitops atomic.
This allows us to remove spinlock protection which is
more heavy-weight than simple atomics.
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 2e2f53c..7c3c1c5 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -844,7 +844,7 @@
if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
set_bit(bit, kaddr);
else
- __set_bit_le(bit, kaddr);
+ test_and_set_bit_le(bit, kaddr);
kunmap_atomic(kaddr);
pr_debug("set file bit %lu page %lu\n", bit, page->index);
/* record page number so it gets flushed to disk when unplug occurs */
@@ -866,7 +866,7 @@
if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
clear_bit(bit, paddr);
else
- __clear_bit_le(bit, paddr);
+ test_and_clear_bit_le(bit, paddr);
kunmap_atomic(paddr);
if (!test_page_attr(bitmap, page->index, BITMAP_PAGE_NEEDWRITE)) {
set_page_attr(bitmap, page->index, BITMAP_PAGE_PENDING);
@@ -1536,9 +1536,7 @@
for (chunk = s; chunk <= e; chunk++) {
sector_t sec = (sector_t)chunk << bitmap->chunkshift;
bitmap_set_memory_bits(bitmap, sec, 1);
- spin_lock_irq(&bitmap->lock);
bitmap_file_set_bit(bitmap, sec);
- spin_unlock_irq(&bitmap->lock);
if (sec < bitmap->mddev->recovery_cp)
/* We are asserting that the array is dirty,
* so move the recovery_cp address back so