md/bitmap: rename and tidy up BITMAP_PAGE_CLEAN
The flag 'BITMAP_PAGE_CLEAN' has a confusing name as it doesn't mean
that the page is clean, but rather that there are counters in the page
which allow bits in the bitmap to be cleared - i.e. maybe cleaning can
happen.
So change it to BITMAP_PAGE_PENDING and fix some irregularities:
- Don't set it in bitmap_init_from_disk as bitmap_set_memory_bits
sets it when needed
- in bitmap_daemon_work, if we find a counter that is '1', but
need_sync is set, then set BITMAP_PAGE_PENDING again (it was
recently cleared) to ensure we don't forget about this bit.
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 0dc6546..69a6f25 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -868,7 +868,8 @@
enum bitmap_page_attr {
BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */
- BITMAP_PAGE_CLEAN = 1, /* there are bits that might need to be cleared */
+ BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned.
+ * i.e. counter is 1 or 2. */
BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */
};
@@ -1111,7 +1112,6 @@
(sector_t)i << CHUNK_BLOCK_SHIFT(bitmap),
needed);
bit_cnt++;
- set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN);
}
}
@@ -1204,7 +1204,7 @@
if (page != lastpage) {
/* skip this page unless it's marked as needing cleaning */
- if (!test_page_attr(bitmap, page, BITMAP_PAGE_CLEAN)) {
+ if (!test_page_attr(bitmap, page, BITMAP_PAGE_PENDING)) {
int need_write = test_page_attr(bitmap, page,
BITMAP_PAGE_NEEDWRITE);
if (need_write)
@@ -1249,19 +1249,17 @@
}
spin_lock_irqsave(&bitmap->lock, flags);
if (!bitmap->need_sync)
- clear_page_attr(bitmap, page, BITMAP_PAGE_CLEAN);
+ clear_page_attr(bitmap, page, BITMAP_PAGE_PENDING);
}
bmc = bitmap_get_counter(bitmap,
(sector_t)j << CHUNK_BLOCK_SHIFT(bitmap),
&blocks, 0);
- if (bmc) {
- if (*bmc)
- bitmap->allclean = 0;
+ if (!bmc)
+ j |= PAGE_COUNTER_MASK;
+ else if (*bmc) {
+ bitmap->allclean = 0;
- if (*bmc == 2) {
- *bmc = 1; /* maybe clear the bit next time */
- set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN);
- } else if (*bmc == 1 && !bitmap->need_sync) {
+ if (*bmc == 1 && !bitmap->need_sync) {
/* we can clear the bit */
*bmc = 0;
bitmap_count_page(bitmap,
@@ -1275,13 +1273,15 @@
paddr);
else
__clear_bit_le(
- file_page_offset(bitmap,
- j),
- paddr);
+ file_page_offset(bitmap,
+ j),
+ paddr);
kunmap_atomic(paddr, KM_USER0);
+ } else if (*bmc <= 2) {
+ *bmc = 1; /* maybe clear the bit next time */
+ set_page_attr(bitmap, page, BITMAP_PAGE_PENDING);
}
- } else
- j |= PAGE_COUNTER_MASK;
+ }
}
spin_unlock_irqrestore(&bitmap->lock, flags);
@@ -1458,7 +1458,7 @@
filemap_get_page(
bitmap,
offset >> CHUNK_BLOCK_SHIFT(bitmap)),
- BITMAP_PAGE_CLEAN);
+ BITMAP_PAGE_PENDING);
spin_unlock_irqrestore(&bitmap->lock, flags);
offset += blocks;
@@ -1546,7 +1546,7 @@
if (*bmc <= 2)
set_page_attr(bitmap,
filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)),
- BITMAP_PAGE_CLEAN);
+ BITMAP_PAGE_PENDING);
}
}
unlock:
@@ -1622,7 +1622,7 @@
*bmc = 1 | (needed ? NEEDED_MASK : 0);
bitmap_count_page(bitmap, offset, 1);
page = filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap));
- set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN);
+ set_page_attr(bitmap, page, BITMAP_PAGE_PENDING);
}
spin_unlock_irq(&bitmap->lock);
bitmap->allclean = 0;