md/lock: ensure updates to page_attrs are properly locked. (7c8f4247) · Commits · 戴 / test

Page attributes are set using __set_bit rather than set_bit as it normally called under a spinlock so the extra atomicity is not needed. However there are two places where we might set or clear page attributes without holding the spinlock. So add the spinlock in those cases. This might be the cause of occasional reports that bits a aren't getting clear properly - theory is that BITMAP_PAGE_PENDING gets lost when BITMAP_PAGE_NEEDWRITE is set or cleared. This is an inconvenience, not a threat to data safety. Signed-off-by:

NeilBrown <neilb@suse.de>

drivers/md/bitmap.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1106,10 +1106,12 @@ void bitmap_write_all(struct bitmap *bitmap)
		*/
		int i;

		spin_lock_irq(&bitmap->lock);
		for (i = 0; i < bitmap->file_pages; i++)
		set_page_attr(bitmap, bitmap->filemap[i],
		BITMAP_PAGE_NEEDWRITE);
		bitmap->allclean = 0;
		spin_unlock_irq(&bitmap->lock);
		}

		static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc)
		@@ -1605,7 +1607,9 @@ void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
		for (chunk = s; chunk <= e; chunk++) {
		sector_t sec = (sector_t)chunk << CHUNK_BLOCK_SHIFT(bitmap);
		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

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