From 4b0715f09655e76ca24c35a9e25e7c464c2f7346 Mon Sep 17 00:00:00 2001 From: Lars Ellenberg Date: Tue, 14 Dec 2010 15:13:04 +0100 Subject: drbd: allow petabyte storage on 64bit arch Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- drivers/block/drbd/drbd_int.h | 41 +++++++++++++++++++++++++++-------------- 1 file changed, 27 insertions(+), 14 deletions(-) (limited to 'drivers/block/drbd/drbd_int.h') diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index 74cc50a2182..5a2d0ec72b3 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -1003,9 +1003,9 @@ struct drbd_conf { struct hlist_head *tl_hash; unsigned int tl_hash_s; - /* blocks to sync in this run [unit BM_BLOCK_SIZE] */ + /* blocks to resync in this run [unit BM_BLOCK_SIZE] */ unsigned long rs_total; - /* number of sync IOs that failed in this run */ + /* number of resync blocks that failed in this run */ unsigned long rs_failed; /* Syncer's start time [unit jiffies] */ unsigned long rs_start; @@ -1399,7 +1399,9 @@ struct bm_extent { * you should use 64bit OS for that much storage, anyways. */ #define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0xffff7fff) #else -#define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0x1LU << 32) +/* we allow up to 1 PiB now on 64bit architecture with "flexible" meta data */ +#define DRBD_MAX_SECTORS_FLEX (1UL << 51) +/* corresponds to (1UL << 38) bits right now. */ #endif #endif @@ -1419,11 +1421,15 @@ extern int drbd_bm_resize(struct drbd_conf *mdev, sector_t sectors, int set_new extern void drbd_bm_cleanup(struct drbd_conf *mdev); extern void drbd_bm_set_all(struct drbd_conf *mdev); extern void drbd_bm_clear_all(struct drbd_conf *mdev); +/* set/clear/test only a few bits at a time */ extern int drbd_bm_set_bits( struct drbd_conf *mdev, unsigned long s, unsigned long e); extern int drbd_bm_clear_bits( struct drbd_conf *mdev, unsigned long s, unsigned long e); -/* bm_set_bits variant for use while holding drbd_bm_lock */ +extern int drbd_bm_count_bits( + struct drbd_conf *mdev, const unsigned long s, const unsigned long e); +/* bm_set_bits variant for use while holding drbd_bm_lock, + * may process the whole bitmap in one go */ extern void _drbd_bm_set_bits(struct drbd_conf *mdev, const unsigned long s, const unsigned long e); extern int drbd_bm_test_bit(struct drbd_conf *mdev, unsigned long bitnr); @@ -1436,6 +1442,8 @@ extern unsigned long drbd_bm_ALe_set_all(struct drbd_conf *mdev, extern size_t drbd_bm_words(struct drbd_conf *mdev); extern unsigned long drbd_bm_bits(struct drbd_conf *mdev); extern sector_t drbd_bm_capacity(struct drbd_conf *mdev); + +#define DRBD_END_OF_BITMAP (~(unsigned long)0) extern unsigned long drbd_bm_find_next(struct drbd_conf *mdev, unsigned long bm_fo); /* bm_find_next variants for use while you hold drbd_bm_lock() */ extern unsigned long _drbd_bm_find_next(struct drbd_conf *mdev, unsigned long bm_fo); @@ -1452,8 +1460,6 @@ extern void drbd_bm_get_lel(struct drbd_conf *mdev, size_t offset, extern void drbd_bm_lock(struct drbd_conf *mdev, char *why); extern void drbd_bm_unlock(struct drbd_conf *mdev); - -extern int drbd_bm_count_bits(struct drbd_conf *mdev, const unsigned long s, const unsigned long e); /* drbd_main.c */ extern struct kmem_cache *drbd_request_cache; @@ -2158,10 +2164,8 @@ extern int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins) static inline void drbd_get_syncer_progress(struct drbd_conf *mdev, unsigned long *bits_left, unsigned int *per_mil_done) { - /* - * this is to break it at compile time when we change that - * (we may feel 4TB maximum storage per drbd is not enough) - */ + /* this is to break it at compile time when we change that, in case we + * want to support more than (1<<32) bits on a 32bit arch. */ typecheck(unsigned long, mdev->rs_total); /* note: both rs_total and rs_left are in bits, i.e. in @@ -2186,10 +2190,19 @@ static inline void drbd_get_syncer_progress(struct drbd_conf *mdev, *bits_left, mdev->rs_total, mdev->rs_failed); *per_mil_done = 0; } else { - /* make sure the calculation happens in long context */ - unsigned long tmp = 1000UL - - (*bits_left >> 10)*1000UL - / ((mdev->rs_total >> 10) + 1UL); + /* Make sure the division happens in long context. + * We allow up to one petabyte storage right now, + * at a granularity of 4k per bit that is 2**38 bits. + * After shift right and multiplication by 1000, + * this should still fit easily into a 32bit long, + * so we don't need a 64bit division on 32bit arch. + * Note: currently we don't support such large bitmaps on 32bit + * arch anyways, but no harm done to be prepared for it here. + */ + unsigned int shift = mdev->rs_total >= (1ULL << 32) ? 16 : 10; + unsigned long left = *bits_left >> shift; + unsigned long total = 1UL + (mdev->rs_total >> shift); + unsigned long tmp = 1000UL - left * 1000UL/total; *per_mil_done = tmp; } } -- cgit v1.2.3