Merge "mtd: ubi: Read threshold verification" (01533203) · Commits · e / devices / samsung / android_kernel_samsung_msm8916

drivers/mtd/ubi/eba.c

+6 −1

Original line number	Diff line number	Diff line
		/*
		* Copyright (c) International Business Machines Corp., 2006
		* Copyright (c) 2014, Linux Foundation. All rights reserved.
		* Linux Foundation chooses to take subject only to the GPLv2
		* license terms, and distributes only under these terms.
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		@@ -466,8 +469,10 @@ retry:
		goto out_unlock;
		}
		}
		if (ubi->lookuptbl[pnum]->rc >= ubi->rd_threshold)
		scrub = 1;

		if (scrub)
		if (scrub && !ubi_in_wl_tree(ubi->lookuptbl[pnum], &ubi->scrub))
		err = ubi_wl_scrub_peb(ubi, pnum);

		leb_read_unlock(ubi, vol_id, lnum);

drivers/mtd/ubi/wl.c

+50 −6

Original line number	Diff line number	Diff line
		@@ -449,7 +449,7 @@ static struct ubi_wl_entry find_anchor_wl_entry(struct rb_root root)
		return victim;
		}

		static int anchor_pebs_avalible(struct rb_root *root)
		static int anchor_pebs_avalible(struct rb_root *root, int rd_threshold)
		{
		struct rb_node *p;
		struct ubi_wl_entry *e;
		@@ -560,6 +560,12 @@ static void return_unused_pool_pebs(struct ubi_device *ubi,

		for (i = pool->used; i < pool->size; i++) {
		e = ubi->lookuptbl[pool->pebs[i]];
		/* If given PEB pending to be scrubbed - remove it */
		if (ubi_in_wl_tree(e, &ubi->scrub)) {
		ubi_err("PEB %d was pending scrubb", e->pnum);
		self_check_in_wl_tree(ubi, e, &ubi->scrub);
		rb_erase(&e->u.rb, &ubi->scrub);
		}
		wl_tree_add(e, &ubi->free);
		ubi->free_count++;
		}
		@@ -937,6 +943,13 @@ static int schedule_erase(struct ubi_device ubi, struct ubi_wl_entry e,
		wl_wrk->lnum = lnum;
		wl_wrk->torture = torture;

		/* If given PEB pending to be scrubbed - remove it */
		if (ubi_in_wl_tree(e, &ubi->scrub)) {
		self_check_in_wl_tree(ubi, e, &ubi->scrub);
		rb_erase(&e->u.rb, &ubi->scrub);
		ubi_msg("PEB %d was pending scrubb",
		e->pnum);
		}
		schedule_ubi_work(ubi, wl_wrk);
		return 0;
		}
		@@ -966,6 +979,14 @@ static int do_sync_erase(struct ubi_device ubi, struct ubi_wl_entry e,
		wl_wrk->lnum = lnum;
		wl_wrk->torture = torture;

		/* If given PEB pending to be scrubbed - remove it */
		if (ubi_in_wl_tree(e, &ubi->scrub)) {
		self_check_in_wl_tree(ubi, e, &ubi->scrub);
		rb_erase(&e->u.rb, &ubi->scrub);
		ubi_msg("PEB %d was pending scrubb",
		e->pnum);
		}

		return erase_worker(ubi, wl_wrk, 0);
		}

		@@ -1070,7 +1091,7 @@ static int wear_leveling_worker(struct ubi_device ubi, struct ubi_work wrk,
		#ifdef CONFIG_MTD_UBI_FASTMAP
		/* Check whether we need to produce an anchor PEB */
		if (!anchor)
		anchor = !anchor_pebs_avalible(&ubi->free);
		anchor = !anchor_pebs_avalible(&ubi->free, ubi->rd_threshold);

		if (anchor) {
		e1 = find_anchor_wl_entry(&ubi->used);
		@@ -1631,6 +1652,8 @@ retry:
		} else if (ubi_in_wl_tree(e, &ubi->scrub)) {
		self_check_in_wl_tree(ubi, e, &ubi->scrub);
		rb_erase(&e->u.rb, &ubi->scrub);
		ubi_msg("PEB %d was pending scrubb",
		e->pnum);
		} else if (ubi_in_wl_tree(e, &ubi->erroneous)) {
		self_check_in_wl_tree(ubi, e, &ubi->erroneous);
		rb_erase(&e->u.rb, &ubi->erroneous);
		@@ -1674,8 +1697,6 @@ int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum)
		{
		struct ubi_wl_entry *e;

		ubi_msg("schedule PEB %d for scrubbing", pnum);

		retry:
		spin_lock(&ubi->wl_lock);
		e = ubi->lookuptbl[pnum];
		@@ -1713,6 +1734,7 @@ retry:
		}
		}

		ubi_msg("schedule PEB %d for scrubbing", pnum);
		wl_tree_add(e, &ubi->scrub);
		spin_unlock(&ubi->wl_lock);

		@@ -1906,7 +1928,9 @@ int ubi_wl_init(struct ubi_device ubi, struct ubi_attach_info ai)
		struct ubi_ainf_volume *av;
		struct ubi_ainf_peb aeb, tmp;
		struct ubi_wl_entry *e;
		struct timeval tv;

		do_gettimeofday(&tv);
		ubi->used = ubi->erroneous = ubi->free = ubi->scrub = RB_ROOT;
		spin_lock_init(&ubi->wl_lock);
		mutex_init(&ubi->move_mutex);
		@@ -1989,8 +2013,17 @@ int ubi_wl_init(struct ubi_device ubi, struct ubi_attach_info ai)
		ubi_assert(e->ec >= 0);
		ubi_assert(!ubi_is_fm_block(ubi, e->pnum));

		/* Check last erase timestamp (in days) */
		if (e->last_erase_time + ubi->dt_threshold <
		(tv.tv_sec / NUM_SEC_IN_DAY)) {
		if (schedule_erase(ubi, e, aeb->vol_id, aeb->lnum, 0)) {
		kmem_cache_free(ubi_wl_entry_slab, e);
		goto out_free;
		}
		} else {
		wl_tree_add(e, &ubi->free);
		ubi->free_count++;
		}

		ubi->lookuptbl[e->pnum] = e;

		@@ -2021,6 +2054,17 @@ int ubi_wl_init(struct ubi_device ubi, struct ubi_attach_info ai)
		e->last_erase_time = aeb->last_erase_time;
		ubi->lookuptbl[e->pnum] = e;

		/*
		* Verify last erase timestamp
		* (in days) and read counter
		*/
		if (e->last_erase_time + ubi->dt_threshold <
		(tv.tv_sec / NUM_SEC_IN_DAY) \|\|
		e->rc > ubi->rd_threshold) {
		ubi_msg("scrub PEB %d rc = %d",
		e->pnum, e->rc);
		aeb->scrub = 1;
		}
		if (!aeb->scrub) {
		dbg_wl("add PEB %d EC %d to the used tree",
		e->pnum, e->ec);