summaryrefslogtreecommitdiff
path: root/drivers/block/drbd/drbd_bitmap.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/block/drbd/drbd_bitmap.c')
-rw-r--r--drivers/block/drbd/drbd_bitmap.c34
1 files changed, 19 insertions, 15 deletions
diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index f440a02dfdb1..1e89a74ddb17 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -112,9 +112,6 @@ struct drbd_bitmap {
struct task_struct *bm_task;
};
-static int __bm_change_bits_to(struct drbd_conf *mdev, const unsigned long s,
- unsigned long e, int val, const enum km_type km);
-
#define bm_print_lock_info(m) __bm_print_lock_info(m, __func__)
static void __bm_print_lock_info(struct drbd_conf *mdev, const char *func)
{
@@ -1256,7 +1253,7 @@ unsigned long _drbd_bm_find_next_zero(struct drbd_conf *mdev, unsigned long bm_f
* expected to be called for only a few bits (e - s about BITS_PER_LONG).
* Must hold bitmap lock already. */
static int __bm_change_bits_to(struct drbd_conf *mdev, const unsigned long s,
- unsigned long e, int val, const enum km_type km)
+ unsigned long e, int val)
{
struct drbd_bitmap *b = mdev->bitmap;
unsigned long *p_addr = NULL;
@@ -1274,14 +1271,14 @@ static int __bm_change_bits_to(struct drbd_conf *mdev, const unsigned long s,
unsigned int page_nr = bm_bit_to_page_idx(b, bitnr);
if (page_nr != last_page_nr) {
if (p_addr)
- __bm_unmap(p_addr, km);
+ __bm_unmap(p_addr, KM_IRQ1);
if (c < 0)
bm_set_page_lazy_writeout(b->bm_pages[last_page_nr]);
else if (c > 0)
bm_set_page_need_writeout(b->bm_pages[last_page_nr]);
changed_total += c;
c = 0;
- p_addr = __bm_map_pidx(b, page_nr, km);
+ p_addr = __bm_map_pidx(b, page_nr, KM_IRQ1);
last_page_nr = page_nr;
}
if (val)
@@ -1290,7 +1287,7 @@ static int __bm_change_bits_to(struct drbd_conf *mdev, const unsigned long s,
c -= (0 != __test_and_clear_bit_le(bitnr & BITS_PER_PAGE_MASK, p_addr));
}
if (p_addr)
- __bm_unmap(p_addr, km);
+ __bm_unmap(p_addr, KM_IRQ1);
if (c < 0)
bm_set_page_lazy_writeout(b->bm_pages[last_page_nr]);
else if (c > 0)
@@ -1318,7 +1315,7 @@ static int bm_change_bits_to(struct drbd_conf *mdev, const unsigned long s,
if ((val ? BM_DONT_SET : BM_DONT_CLEAR) & b->bm_flags)
bm_print_lock_info(mdev);
- c = __bm_change_bits_to(mdev, s, e, val, KM_IRQ1);
+ c = __bm_change_bits_to(mdev, s, e, val);
spin_unlock_irqrestore(&b->bm_lock, flags);
return c;
@@ -1343,16 +1340,17 @@ static inline void bm_set_full_words_within_one_page(struct drbd_bitmap *b,
{
int i;
int bits;
- unsigned long *paddr = kmap_atomic(b->bm_pages[page_nr], KM_USER0);
+ unsigned long *paddr = kmap_atomic(b->bm_pages[page_nr], KM_IRQ1);
for (i = first_word; i < last_word; i++) {
bits = hweight_long(paddr[i]);
paddr[i] = ~0UL;
b->bm_set += BITS_PER_LONG - bits;
}
- kunmap_atomic(paddr, KM_USER0);
+ kunmap_atomic(paddr, KM_IRQ1);
}
-/* Same thing as drbd_bm_set_bits, but without taking the spin_lock_irqsave.
+/* Same thing as drbd_bm_set_bits,
+ * but more efficient for a large bit range.
* You must first drbd_bm_lock().
* Can be called to set the whole bitmap in one go.
* Sets bits from s to e _inclusive_. */
@@ -1366,6 +1364,7 @@ void _drbd_bm_set_bits(struct drbd_conf *mdev, const unsigned long s, const unsi
* Do not use memset, because we must account for changes,
* so we need to loop over the words with hweight() anyways.
*/
+ struct drbd_bitmap *b = mdev->bitmap;
unsigned long sl = ALIGN(s,BITS_PER_LONG);
unsigned long el = (e+1) & ~((unsigned long)BITS_PER_LONG-1);
int first_page;
@@ -1376,15 +1375,19 @@ void _drbd_bm_set_bits(struct drbd_conf *mdev, const unsigned long s, const unsi
if (e - s <= 3*BITS_PER_LONG) {
/* don't bother; el and sl may even be wrong. */
- __bm_change_bits_to(mdev, s, e, 1, KM_USER0);
+ spin_lock_irq(&b->bm_lock);
+ __bm_change_bits_to(mdev, s, e, 1);
+ spin_unlock_irq(&b->bm_lock);
return;
}
/* difference is large enough that we can trust sl and el */
+ spin_lock_irq(&b->bm_lock);
+
/* bits filling the current long */
if (sl)
- __bm_change_bits_to(mdev, s, sl-1, 1, KM_USER0);
+ __bm_change_bits_to(mdev, s, sl-1, 1);
first_page = sl >> (3 + PAGE_SHIFT);
last_page = el >> (3 + PAGE_SHIFT);
@@ -1397,7 +1400,7 @@ void _drbd_bm_set_bits(struct drbd_conf *mdev, const unsigned long s, const unsi
/* first and full pages, unless first page == last page */
for (page_nr = first_page; page_nr < last_page; page_nr++) {
bm_set_full_words_within_one_page(mdev->bitmap, page_nr, first_word, last_word);
- cond_resched();
+ cond_resched_lock(&b->bm_lock);
first_word = 0;
}
@@ -1411,7 +1414,8 @@ void _drbd_bm_set_bits(struct drbd_conf *mdev, const unsigned long s, const unsi
* it would trigger an assert in __bm_change_bits_to()
*/
if (el <= e)
- __bm_change_bits_to(mdev, el, e, 1, KM_USER0);
+ __bm_change_bits_to(mdev, el, e, 1);
+ spin_unlock_irq(&b->bm_lock);
}
/* returns bit state