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Commit 022e510f authored by Ming Lei's avatar Ming Lei Committed by Shaohua Li
Browse files

md: remove 'idx' from 'struct resync_pages' 



bio_add_page() won't fail for resync bio, and the page index for each
bio is same, so remove it.

More importantly the 'idx' of 'struct resync_pages' is initialized in
mempool allocator function, the current way is wrong since mempool is
only responsible for allocation, we can't use that for initialization.

Suggested-by: default avatarNeilBrown <neilb@suse.com>
Reported-by: default avatarNeilBrown <neilb@suse.com>
Reported-and-tested-by: default avatarPatrick <dto@gmx.net>
Fixes: f0250618(md: raid10: don't use bio's vec table to manage resync pages)
Fixes: 98d30c58(md: raid1: don't use bio's vec table to manage resync pages)
Cc: stable@vger.kernel.org (4.12+)
Signed-off-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarShaohua Li <shli@fb.com>
parent 4ec9f7a1

drivers/md/md.h

+0 −1
Original line number Diff line number Diff line
@@ -738,7 +738,6 @@ static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio 


/* for managing resync I/O pages */

struct resync_pages {

	unsigned	idx;	/* for get/put page from the pool */

	void		*raid_bio;

	struct page	*pages[RESYNC_PAGES];

};

drivers/md/raid1.c

+3 −3
Original line number Diff line number Diff line
@@ -170,7 +170,6 @@ static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) 
			resync_get_all_pages(rp);

		}



		rp->idx = 0;

		rp->raid_bio = r1_bio;

		bio->bi_private = rp;

	}
@@ -2619,6 +2618,7 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 
	int good_sectors = RESYNC_SECTORS;

	int min_bad = 0; /* number of sectors that are bad in all devices */

	int idx = sector_to_idx(sector_nr);

	int page_idx = 0;



	if (!conf->r1buf_pool)

		if (init_resync(conf))
@@ -2846,7 +2846,7 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 
			bio = r1_bio->bios[i];

			rp = get_resync_pages(bio);

			if (bio->bi_end_io) {

				page = resync_fetch_page(rp, rp->idx++);

				page = resync_fetch_page(rp, page_idx);



				/*

				 * won't fail because the vec table is big
@@ -2858,7 +2858,7 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 
		nr_sectors += len>>9;

		sector_nr += len>>9;

		sync_blocks -= (len>>9);

	} while (get_resync_pages(r1_bio->bios[disk]->bi_private)->idx < RESYNC_PAGES);

	} while (++page_idx < RESYNC_PAGES);



	r1_bio->sectors = nr_sectors;

drivers/md/raid10.c

+3 −3
Original line number Diff line number Diff line
@@ -221,7 +221,6 @@ static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data) 
			resync_get_all_pages(rp);

		}



		rp->idx = 0;

		rp->raid_bio = r10_bio;

		bio->bi_private = rp;

		if (rbio) {
@@ -2853,6 +2852,7 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr, 
	sector_t sectors_skipped = 0;

	int chunks_skipped = 0;

	sector_t chunk_mask = conf->geo.chunk_mask;

	int page_idx = 0;



	if (!conf->r10buf_pool)

		if (init_resync(conf))
@@ -3355,7 +3355,7 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr, 
			break;

		for (bio= biolist ; bio ; bio=bio->bi_next) {

			struct resync_pages *rp = get_resync_pages(bio);

			page = resync_fetch_page(rp, rp->idx++);

			page = resync_fetch_page(rp, page_idx);

			/*

			 * won't fail because the vec table is big enough

			 * to hold all these pages
@@ -3364,7 +3364,7 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr, 
		}

		nr_sectors += len>>9;

		sector_nr += len>>9;

	} while (get_resync_pages(biolist)->idx < RESYNC_PAGES);

	} while (++page_idx < RESYNC_PAGES);

	r10_bio->sectors = nr_sectors;



	while (biolist) {