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-rw-r--r--drivers/md/bitmap.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 41df4cda66e..2925219f088 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -520,6 +520,8 @@ success:
bitmap->daemon_sleep = daemon_sleep;
bitmap->flags |= sb->state;
bitmap->events_cleared = le64_to_cpu(sb->events_cleared);
+ if (sb->state & BITMAP_STALE)
+ bitmap->events_cleared = bitmap->mddev->events;
err = 0;
out:
kunmap(bitmap->sb_page);
@@ -818,7 +820,7 @@ int bitmap_unplug(struct bitmap *bitmap)
return 0;
}
-static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset);
+static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed);
/* * bitmap_init_from_disk -- called at bitmap_create time to initialize
* the in-memory bitmap from the on-disk bitmap -- also, sets up the
* memory mapping of the bitmap file
@@ -826,8 +828,11 @@ static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset);
* if there's no bitmap file, or if the bitmap file had been
* previously kicked from the array, we mark all the bits as
* 1's in order to cause a full resync.
+ *
+ * We ignore all bits for sectors that end earlier than 'start'.
+ * This is used when reading an out-of-date bitmap...
*/
-static int bitmap_init_from_disk(struct bitmap *bitmap)
+static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
{
unsigned long i, chunks, index, oldindex, bit;
struct page *page = NULL, *oldpage = NULL;
@@ -914,7 +919,7 @@ static int bitmap_init_from_disk(struct bitmap *bitmap)
* whole page and write it out
*/
memset(page_address(page) + offset, 0xff,
- PAGE_SIZE - offset);
+ PAGE_SIZE - offset);
ret = write_page(bitmap, page, 1);
if (ret) {
kunmap(page);
@@ -928,8 +933,11 @@ static int bitmap_init_from_disk(struct bitmap *bitmap)
}
if (test_bit(bit, page_address(page))) {
/* if the disk bit is set, set the memory bit */
- bitmap_set_memory_bits(bitmap, i << CHUNK_BLOCK_SHIFT(bitmap));
+ bitmap_set_memory_bits(bitmap, i << CHUNK_BLOCK_SHIFT(bitmap),
+ ((i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) >= start)
+ );
bit_cnt++;
+ set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN);
}
}
@@ -1424,7 +1432,7 @@ void bitmap_close_sync(struct bitmap *bitmap)
}
}
-static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset)
+static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed)
{
/* For each chunk covered by any of these sectors, set the
* counter to 1 and set resync_needed. They should all
@@ -1441,7 +1449,7 @@ static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset)
}
if (! *bmc) {
struct page *page;
- *bmc = 1 | NEEDED_MASK;
+ *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);
@@ -1517,6 +1525,7 @@ int bitmap_create(mddev_t *mddev)
unsigned long pages;
struct file *file = mddev->bitmap_file;
int err;
+ sector_t start;
BUG_ON(sizeof(bitmap_super_t) != 256);
@@ -1581,7 +1590,12 @@ int bitmap_create(mddev_t *mddev)
/* now that we have some pages available, initialize the in-memory
* bitmap from the on-disk bitmap */
- err = bitmap_init_from_disk(bitmap);
+ start = 0;
+ if (mddev->degraded == 0
+ || bitmap->events_cleared == mddev->events)
+ /* no need to keep dirty bits to optimise a re-add of a missing device */
+ start = mddev->recovery_cp;
+ err = bitmap_init_from_disk(bitmap, start);
if (err)
return err;