Commit 78d6d497 authored by Richard Weinberger's avatar Richard Weinberger
Browse files

UBI: Move fastmap specific functions out of wl.c 



Fastmap is tightly connected to the WL sub-system, many fastmap-specific
functionslive in wl.c.
To get rid of most #ifdefs in wl.c move this functions into a new file
and include it into wl.c

Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 479c2c0c

drivers/mtd/ubi/fastmap-wl.c

0 → 100644
+361 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2012 Linutronix GmbH

 * Copyright (c) 2014 sigma star gmbh

 * Author: Richard Weinberger <richard@nod.at>

 *

 * 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

 * the Free Software Foundation; version 2.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See

 * the GNU General Public License for more details.

 *

 */



/**

 * update_fastmap_work_fn - calls ubi_update_fastmap from a work queue

 * @wrk: the work description object

 */

static void update_fastmap_work_fn(struct work_struct *wrk)

{

	struct ubi_device *ubi = container_of(wrk, struct ubi_device, fm_work);

	ubi_update_fastmap(ubi);

	spin_lock(&ubi->wl_lock);

	ubi->fm_work_scheduled = 0;

	spin_unlock(&ubi->wl_lock);

}



/**

 *  is_fm_block - returns 1 if a PEB is currently used in a fastmap.

 *  @ubi: UBI device description object

 *  @pnum: the to be checked PEB

 */

static int is_fm_block(struct ubi_device *ubi, int pnum)

{

	int i;



	if (!ubi->fm)

		return 0;



	for (i = 0; i < ubi->fm->used_blocks; i++)

		if (ubi->fm->e[i]->pnum == pnum)

			return 1;



	return 0;

}



/**

 * find_anchor_wl_entry - find wear-leveling entry to used as anchor PEB.

 * @root: the RB-tree where to look for

 */

static struct ubi_wl_entry *find_anchor_wl_entry(struct rb_root *root)

{

	struct rb_node *p;

	struct ubi_wl_entry *e, *victim = NULL;

	int max_ec = UBI_MAX_ERASECOUNTER;



	ubi_rb_for_each_entry(p, e, root, u.rb) {

		if (e->pnum < UBI_FM_MAX_START && e->ec < max_ec) {

			victim = e;

			max_ec = e->ec;

		}

	}



	return victim;

}



/**

 * return_unused_pool_pebs - returns unused PEB to the free tree.

 * @ubi: UBI device description object

 * @pool: fastmap pool description object

 */

static void return_unused_pool_pebs(struct ubi_device *ubi,

				    struct ubi_fm_pool *pool)

{

	int i;

	struct ubi_wl_entry *e;



	for (i = pool->used; i < pool->size; i++) {

		e = ubi->lookuptbl[pool->pebs[i]];

		wl_tree_add(e, &ubi->free);

		ubi->free_count++;

	}

}



static int anchor_pebs_avalible(struct rb_root *root)

{

	struct rb_node *p;

	struct ubi_wl_entry *e;



	ubi_rb_for_each_entry(p, e, root, u.rb)

		if (e->pnum < UBI_FM_MAX_START)

			return 1;



	return 0;

}



/**

 * ubi_wl_get_fm_peb - find a physical erase block with a given maximal number.

 * @ubi: UBI device description object

 * @anchor: This PEB will be used as anchor PEB by fastmap

 *

 * The function returns a physical erase block with a given maximal number

 * and removes it from the wl subsystem.

 * Must be called with wl_lock held!

 */

struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor)

{

	struct ubi_wl_entry *e = NULL;



	if (!ubi->free.rb_node || (ubi->free_count - ubi->beb_rsvd_pebs < 1))

		goto out;



	if (anchor)

		e = find_anchor_wl_entry(&ubi->free);

	else

		e = find_mean_wl_entry(ubi, &ubi->free);



	if (!e)

		goto out;



	self_check_in_wl_tree(ubi, e, &ubi->free);



	/* remove it from the free list,

	 * the wl subsystem does no longer know this erase block */

	rb_erase(&e->u.rb, &ubi->free);

	ubi->free_count--;

out:

	return e;

}



/**

 * ubi_refill_pools - refills all fastmap PEB pools.

 * @ubi: UBI device description object

 */

void ubi_refill_pools(struct ubi_device *ubi)

{

	struct ubi_fm_pool *wl_pool = &ubi->fm_wl_pool;

	struct ubi_fm_pool *pool = &ubi->fm_pool;

	struct ubi_wl_entry *e;

	int enough;



	spin_lock(&ubi->wl_lock);



	return_unused_pool_pebs(ubi, wl_pool);

	return_unused_pool_pebs(ubi, pool);



	wl_pool->size = 0;

	pool->size = 0;



	for (;;) {

		enough = 0;

		if (pool->size < pool->max_size) {

			if (!ubi->free.rb_node)

				break;



			e = wl_get_wle(ubi);

			if (!e)

				break;



			pool->pebs[pool->size] = e->pnum;

			pool->size++;

		} else

			enough++;



		if (wl_pool->size < wl_pool->max_size) {

			if (!ubi->free.rb_node ||

			   (ubi->free_count - ubi->beb_rsvd_pebs < 5))

				break;



			e = find_wl_entry(ubi, &ubi->free, WL_FREE_MAX_DIFF);

			self_check_in_wl_tree(ubi, e, &ubi->free);

			rb_erase(&e->u.rb, &ubi->free);

			ubi->free_count--;



			wl_pool->pebs[wl_pool->size] = e->pnum;

			wl_pool->size++;

		} else

			enough++;



		if (enough == 2)

			break;

	}



	wl_pool->used = 0;

	pool->used = 0;



	spin_unlock(&ubi->wl_lock);

}



/**

 * ubi_wl_get_peb - get a physical eraseblock.

 * @ubi: UBI device description object

 *

 * This function returns a physical eraseblock in case of success and a

 * negative error code in case of failure.

 * Returns with ubi->fm_eba_sem held in read mode!

 */

int ubi_wl_get_peb(struct ubi_device *ubi)

{

	int ret, retried = 0;

	struct ubi_fm_pool *pool = &ubi->fm_pool;

	struct ubi_fm_pool *wl_pool = &ubi->fm_wl_pool;



again:

	down_read(&ubi->fm_eba_sem);

	spin_lock(&ubi->wl_lock);



	/* We check here also for the WL pool because at this point we can

	 * refill the WL pool synchronous. */

	if (pool->used == pool->size || wl_pool->used == wl_pool->size) {

		spin_unlock(&ubi->wl_lock);

		up_read(&ubi->fm_eba_sem);

		ret = ubi_update_fastmap(ubi);

		if (ret) {

			ubi_msg(ubi, "Unable to write a new fastmap: %i", ret);

			down_read(&ubi->fm_eba_sem);

			return -ENOSPC;

		}

		down_read(&ubi->fm_eba_sem);

		spin_lock(&ubi->wl_lock);

	}



	if (pool->used == pool->size) {

		spin_unlock(&ubi->wl_lock);

		if (retried) {

			ubi_err(ubi, "Unable to get a free PEB from user WL pool");

			ret = -ENOSPC;

			goto out;

		}

		retried = 1;

		up_read(&ubi->fm_eba_sem);

		goto again;

	}



	ubi_assert(pool->used < pool->size);

	ret = pool->pebs[pool->used++];

	prot_queue_add(ubi, ubi->lookuptbl[ret]);

	spin_unlock(&ubi->wl_lock);

out:

	return ret;

}



/* get_peb_for_wl - returns a PEB to be used internally by the WL sub-system.

 *

 * @ubi: UBI device description object

 */

static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi)

{

	struct ubi_fm_pool *pool = &ubi->fm_wl_pool;

	int pnum;



	if (pool->used == pool->size) {

		/* We cannot update the fastmap here because this

		 * function is called in atomic context.

		 * Let's fail here and refill/update it as soon as possible. */

		if (!ubi->fm_work_scheduled) {

			ubi->fm_work_scheduled = 1;

			schedule_work(&ubi->fm_work);

		}

		return NULL;

	} else {

		pnum = pool->pebs[pool->used++];

		return ubi->lookuptbl[pnum];

	}

}



/**

 * ubi_ensure_anchor_pebs - schedule wear-leveling to produce an anchor PEB.

 * @ubi: UBI device description object

 */

int ubi_ensure_anchor_pebs(struct ubi_device *ubi)

{

	struct ubi_work *wrk;



	spin_lock(&ubi->wl_lock);

	if (ubi->wl_scheduled) {

		spin_unlock(&ubi->wl_lock);

		return 0;

	}

	ubi->wl_scheduled = 1;

	spin_unlock(&ubi->wl_lock);



	wrk = kmalloc(sizeof(struct ubi_work), GFP_NOFS);

	if (!wrk) {

		spin_lock(&ubi->wl_lock);

		ubi->wl_scheduled = 0;

		spin_unlock(&ubi->wl_lock);

		return -ENOMEM;

	}



	wrk->anchor = 1;

	wrk->func = &wear_leveling_worker;

	schedule_ubi_work(ubi, wrk);

	return 0;

}



/**

 * ubi_wl_put_fm_peb - returns a PEB used in a fastmap to the wear-leveling

 * sub-system.

 * see: ubi_wl_put_peb()

 *

 * @ubi: UBI device description object

 * @fm_e: physical eraseblock to return

 * @lnum: the last used logical eraseblock number for the PEB

 * @torture: if this physical eraseblock has to be tortured

 */

int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *fm_e,

		      int lnum, int torture)

{

	struct ubi_wl_entry *e;

	int vol_id, pnum = fm_e->pnum;



	dbg_wl("PEB %d", pnum);



	ubi_assert(pnum >= 0);

	ubi_assert(pnum < ubi->peb_count);



	spin_lock(&ubi->wl_lock);

	e = ubi->lookuptbl[pnum];



	/* This can happen if we recovered from a fastmap the very

	 * first time and writing now a new one. In this case the wl system

	 * has never seen any PEB used by the original fastmap.

	 */

	if (!e) {

		e = fm_e;

		ubi_assert(e->ec >= 0);

		ubi->lookuptbl[pnum] = e;

	}



	spin_unlock(&ubi->wl_lock);



	vol_id = lnum ? UBI_FM_DATA_VOLUME_ID : UBI_FM_SB_VOLUME_ID;

	return schedule_erase(ubi, e, vol_id, lnum, torture);

}



/**

 * ubi_is_erase_work - checks whether a work is erase work.

 * @wrk: The work object to be checked

 */

int ubi_is_erase_work(struct ubi_work *wrk)

{

	return wrk->func == erase_worker;

}



static void ubi_fastmap_close(struct ubi_device *ubi)

{

	int i;



	flush_work(&ubi->fm_work);

	return_unused_pool_pebs(ubi, &ubi->fm_pool);

	return_unused_pool_pebs(ubi, &ubi->fm_wl_pool);



	if (ubi->fm) {

		for (i = 0; i < ubi->fm->used_blocks; i++)

			kfree(ubi->fm->e[i]);

	}

	kfree(ubi->fm);

}

drivers/mtd/ubi/wl.c

+97 −463
Original line number Diff line number Diff line
@@ -103,6 +103,7 @@ 
#include <linux/freezer.h>

#include <linux/kthread.h>

#include "ubi.h"

#include "wl.h"



/* Number of physical eraseblocks reserved for wear-leveling purposes */

#define WL_RESERVED_PEBS 1
@@ -140,45 +141,6 @@ static int self_check_in_wl_tree(const struct ubi_device *ubi, 
static int self_check_in_pq(const struct ubi_device *ubi,

			    struct ubi_wl_entry *e);



#ifdef CONFIG_MTD_UBI_FASTMAP

/**

 * update_fastmap_work_fn - calls ubi_update_fastmap from a work queue

 * @wrk: the work description object

 */

static void update_fastmap_work_fn(struct work_struct *wrk)

{

	struct ubi_device *ubi = container_of(wrk, struct ubi_device, fm_work);

	ubi_update_fastmap(ubi);

	spin_lock(&ubi->wl_lock);

	ubi->fm_work_scheduled = 0;

	spin_unlock(&ubi->wl_lock);

}



/**

 *  ubi_ubi_is_fm_block - returns 1 if a PEB is currently used in a fastmap.

 *  @ubi: UBI device description object

 *  @pnum: the to be checked PEB

 */

static int ubi_is_fm_block(struct ubi_device *ubi, int pnum)

{

	int i;



	if (!ubi->fm)

		return 0;



	for (i = 0; i < ubi->fm->used_blocks; i++)

		if (ubi->fm->e[i]->pnum == pnum)

			return 1;



	return 0;

}

#else

static int ubi_is_fm_block(struct ubi_device *ubi, int pnum)

{

	return 0;

}

#endif



/**

 * wl_tree_add - add a wear-leveling entry to a WL RB-tree.

 * @e: the wear-leveling entry to add
@@ -276,33 +238,6 @@ static int do_work(struct ubi_device *ubi) 
	return err;

}



/**

 * produce_free_peb - produce a free physical eraseblock.

 * @ubi: UBI device description object

 *

 * This function tries to make a free PEB by means of synchronous execution of

 * pending works. This may be needed if, for example the background thread is

 * disabled. Returns zero in case of success and a negative error code in case

 * of failure.

 */

static int produce_free_peb(struct ubi_device *ubi)

{

	int err;



	while (!ubi->free.rb_node && ubi->works_count) {

		spin_unlock(&ubi->wl_lock);



		dbg_wl("do one work synchronously");

		err = do_work(ubi);



		spin_lock(&ubi->wl_lock);

		if (err)

			return err;

	}



	return 0;

}



/**

 * in_wl_tree - check if wear-leveling entry is present in a WL RB-tree.

 * @e: the wear-leveling entry to check
@@ -441,76 +376,8 @@ static struct ubi_wl_entry *find_mean_wl_entry(struct ubi_device *ubi, 
	return e;

}



#ifdef CONFIG_MTD_UBI_FASTMAP

/**

 * find_anchor_wl_entry - find wear-leveling entry to used as anchor PEB.

 * @root: the RB-tree where to look for

 */

static struct ubi_wl_entry *find_anchor_wl_entry(struct rb_root *root)

{

	struct rb_node *p;

	struct ubi_wl_entry *e, *victim = NULL;

	int max_ec = UBI_MAX_ERASECOUNTER;



	ubi_rb_for_each_entry(p, e, root, u.rb) {

		if (e->pnum < UBI_FM_MAX_START && e->ec < max_ec) {

			victim = e;

			max_ec = e->ec;

		}

	}



	return victim;

}



static int anchor_pebs_avalible(struct rb_root *root)

{

	struct rb_node *p;

	struct ubi_wl_entry *e;



	ubi_rb_for_each_entry(p, e, root, u.rb)

		if (e->pnum < UBI_FM_MAX_START)

			return 1;



	return 0;

}



/**

 * ubi_wl_get_fm_peb - find a physical erase block with a given maximal number.

 * @ubi: UBI device description object

 * @anchor: This PEB will be used as anchor PEB by fastmap

 *

 * The function returns a physical erase block with a given maximal number

 * and removes it from the wl subsystem.

 * Must be called with wl_lock held!

 */

struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor)

{

	struct ubi_wl_entry *e = NULL;



	if (!ubi->free.rb_node || (ubi->free_count - ubi->beb_rsvd_pebs < 1))

		goto out;



	if (anchor)

		e = find_anchor_wl_entry(&ubi->free);

	else

		e = find_mean_wl_entry(ubi, &ubi->free);



	if (!e)

		goto out;



	self_check_in_wl_tree(ubi, e, &ubi->free);



	/* remove it from the free list,

	 * the wl subsystem does no longer know this erase block */

	rb_erase(&e->u.rb, &ubi->free);

	ubi->free_count--;

out:

	return e;

}

#endif



/**

 * wl_get_wle - get a mean wl entry to be used by wl_get_peb() or

 * wl_get_wle - get a mean wl entry to be used by ubi_wl_get_peb() or

 * refill_wl_user_pool().

 * @ubi: UBI device description object

 *
@@ -540,228 +407,6 @@ static struct ubi_wl_entry *wl_get_wle(struct ubi_device *ubi) 
	return e;

}



/**

 * wl_get_peb - get a physical eraseblock.

 * @ubi: UBI device description object

 *

 * This function returns a physical eraseblock in case of success and a

 * negative error code in case of failure.

 * It is the low level component of ubi_wl_get_peb() in the non-fastmap

 * case.

 */

static int wl_get_peb(struct ubi_device *ubi)

{

	int err;

	struct ubi_wl_entry *e;



retry:

	if (!ubi->free.rb_node) {

		if (ubi->works_count == 0) {

			ubi_err(ubi, "no free eraseblocks");

			ubi_assert(list_empty(&ubi->works));

			return -ENOSPC;

		}



		err = produce_free_peb(ubi);

		if (err < 0)

			return err;

		goto retry;

	}



	e = wl_get_wle(ubi);

	prot_queue_add(ubi, e);



	return e->pnum;

}



#ifdef CONFIG_MTD_UBI_FASTMAP

/**

 * return_unused_pool_pebs - returns unused PEB to the free tree.

 * @ubi: UBI device description object

 * @pool: fastmap pool description object

 */

static void return_unused_pool_pebs(struct ubi_device *ubi,

				    struct ubi_fm_pool *pool)

{

	int i;

	struct ubi_wl_entry *e;



	for (i = pool->used; i < pool->size; i++) {

		e = ubi->lookuptbl[pool->pebs[i]];

		wl_tree_add(e, &ubi->free);

		ubi->free_count++;

	}

}



/**

 * ubi_refill_pools - refills all fastmap PEB pools.

 * @ubi: UBI device description object

 */

void ubi_refill_pools(struct ubi_device *ubi)

{

	struct ubi_fm_pool *wl_pool = &ubi->fm_wl_pool;

	struct ubi_fm_pool *pool = &ubi->fm_pool;

	struct ubi_wl_entry *e;

	int enough;



	spin_lock(&ubi->wl_lock);



	return_unused_pool_pebs(ubi, wl_pool);

	return_unused_pool_pebs(ubi, pool);



	wl_pool->size = 0;

	pool->size = 0;



	for (;;) {

		enough = 0;

		if (pool->size < pool->max_size) {

			if (!ubi->free.rb_node ||

			   (ubi->free_count - ubi->beb_rsvd_pebs < 5))

				break;



			e = wl_get_wle(ubi);

			if (!e)

				break;



			pool->pebs[pool->size] = e->pnum;

			pool->size++;

		} else

			enough++;



		if (wl_pool->size < wl_pool->max_size) {

			if (!ubi->free.rb_node ||

			   (ubi->free_count - ubi->beb_rsvd_pebs < 5))

				break;



			e = find_wl_entry(ubi, &ubi->free, WL_FREE_MAX_DIFF);

			self_check_in_wl_tree(ubi, e, &ubi->free);

			rb_erase(&e->u.rb, &ubi->free);

			ubi->free_count--;



			wl_pool->pebs[wl_pool->size] = e->pnum;

			wl_pool->size++;

		} else

			enough++;



		if (enough == 2)

			break;

	}



	wl_pool->used = 0;

	pool->used = 0;



	spin_unlock(&ubi->wl_lock);

}



/* ubi_wl_get_peb - works exaclty like __wl_get_peb but keeps track of

 * the fastmap pool.

 * Returns with ubi->fm_eba_sem held in read mode!

 */

int ubi_wl_get_peb(struct ubi_device *ubi)

{

	int ret, retried = 0;

	struct ubi_fm_pool *pool = &ubi->fm_pool;

	struct ubi_fm_pool *wl_pool = &ubi->fm_wl_pool;



again:

	down_read(&ubi->fm_eba_sem);

	spin_lock(&ubi->wl_lock);

	/* We check here also for the WL pool because at this point we can

	 * refill the WL pool synchronous. */

	if (pool->used == pool->size || wl_pool->used == wl_pool->size) {

		spin_unlock(&ubi->wl_lock);

		up_read(&ubi->fm_eba_sem);

		ret = ubi_update_fastmap(ubi);

		if (ret) {

			ubi_msg(ubi, "Unable to write a new fastmap: %i", ret);

			down_read(&ubi->fm_eba_sem);

			return -ENOSPC;

		}

		down_read(&ubi->fm_eba_sem);

		spin_lock(&ubi->wl_lock);

	}



	if (pool->used == pool->size) {

		spin_unlock(&ubi->wl_lock);

		if (retried) {

			ubi_err(ubi, "Unable to get a free PEB from user WL pool");

			ret = -ENOSPC;

			goto out;

		}

		retried = 1;

		up_read(&ubi->fm_eba_sem);

		goto again;

	}



	ubi_assert(pool->used < pool->size);

	ret = pool->pebs[pool->used++];

	prot_queue_add(ubi, ubi->lookuptbl[ret]);

	spin_unlock(&ubi->wl_lock);

out:

	return ret;

}



/* get_peb_for_wl - returns a PEB to be used internally by the WL sub-system.

 *

 * @ubi: UBI device description object

 */

static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi)

{

	struct ubi_fm_pool *pool = &ubi->fm_wl_pool;

	int pnum;



	if (pool->used == pool->size) {

		/* We cannot update the fastmap here because this

		 * function is called in atomic context.

		 * Let's fail here and refill/update it as soon as possible. */

		if (!ubi->fm_work_scheduled) {

			ubi->fm_work_scheduled = 1;

			schedule_work(&ubi->fm_work);

		}

		return NULL;

	} else {

		pnum = pool->pebs[pool->used++];

		return ubi->lookuptbl[pnum];

	}

}

#else

static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi)

{

	struct ubi_wl_entry *e;



	e = find_wl_entry(ubi, &ubi->free, WL_FREE_MAX_DIFF);

	self_check_in_wl_tree(ubi, e, &ubi->free);

	ubi->free_count--;

	ubi_assert(ubi->free_count >= 0);

	rb_erase(&e->u.rb, &ubi->free);



	return e;

}



int ubi_wl_get_peb(struct ubi_device *ubi)

{

	int peb, err;



	spin_lock(&ubi->wl_lock);

	peb = wl_get_peb(ubi);

	spin_unlock(&ubi->wl_lock);

	down_read(&ubi->fm_eba_sem);



	if (peb < 0)

		return peb;



	err = ubi_self_check_all_ff(ubi, peb, ubi->vid_hdr_aloffset,

				    ubi->peb_size - ubi->vid_hdr_aloffset);

	if (err) {

		ubi_err(ubi, "new PEB %d does not contain all 0xFF bytes",

			peb);

		return err;

	}



	return peb;

}

#endif



/**

 * prot_queue_del - remove a physical eraseblock from the protection queue.

 * @ubi: UBI device description object
@@ -928,17 +573,6 @@ static void schedule_ubi_work(struct ubi_device *ubi, struct ubi_work *wrk) 
static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,

			int shutdown);



#ifdef CONFIG_MTD_UBI_FASTMAP

/**

 * ubi_is_erase_work - checks whether a work is erase work.

 * @wrk: The work object to be checked

 */

int ubi_is_erase_work(struct ubi_work *wrk)

{

	return wrk->func == erase_worker;

}

#endif



/**

 * schedule_erase - schedule an erase work.

 * @ubi: UBI device description object
@@ -956,7 +590,7 @@ static int schedule_erase(struct ubi_device *ubi, struct ubi_wl_entry *e, 
	struct ubi_work *wl_wrk;



	ubi_assert(e);

	ubi_assert(!ubi_is_fm_block(ubi, e->pnum));

	ubi_assert(!is_fm_block(ubi, e->pnum));



	dbg_wl("schedule erasure of PEB %d, EC %d, torture %d",

	       e->pnum, e->ec, torture);
@@ -1003,48 +637,6 @@ static int do_sync_erase(struct ubi_device *ubi, struct ubi_wl_entry *e, 
	return erase_worker(ubi, wl_wrk, 0);

}



#ifdef CONFIG_MTD_UBI_FASTMAP

/**

 * ubi_wl_put_fm_peb - returns a PEB used in a fastmap to the wear-leveling

 * sub-system.

 * see: ubi_wl_put_peb()

 *

 * @ubi: UBI device description object

 * @fm_e: physical eraseblock to return

 * @lnum: the last used logical eraseblock number for the PEB

 * @torture: if this physical eraseblock has to be tortured

 */

int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *fm_e,

		      int lnum, int torture)

{

	struct ubi_wl_entry *e;

	int vol_id, pnum = fm_e->pnum;



	dbg_wl("PEB %d", pnum);



	ubi_assert(pnum >= 0);

	ubi_assert(pnum < ubi->peb_count);



	spin_lock(&ubi->wl_lock);

	e = ubi->lookuptbl[pnum];



	/* This can happen if we recovered from a fastmap the very

	 * first time and writing now a new one. In this case the wl system

	 * has never seen any PEB used by the original fastmap.

	 */

	if (!e) {

		e = fm_e;

		ubi_assert(e->ec >= 0);

		ubi->lookuptbl[pnum] = e;

	}



	spin_unlock(&ubi->wl_lock);



	vol_id = lnum ? UBI_FM_DATA_VOLUME_ID : UBI_FM_SB_VOLUME_ID;

	return schedule_erase(ubi, e, vol_id, lnum, torture);

}

#endif



/**

 * wear_leveling_worker - wear-leveling worker function.

 * @ubi: UBI device description object
@@ -1427,38 +1019,6 @@ out_unlock: 
	return err;

}



#ifdef CONFIG_MTD_UBI_FASTMAP

/**

 * ubi_ensure_anchor_pebs - schedule wear-leveling to produce an anchor PEB.

 * @ubi: UBI device description object

 */

int ubi_ensure_anchor_pebs(struct ubi_device *ubi)

{

	struct ubi_work *wrk;



	spin_lock(&ubi->wl_lock);

	if (ubi->wl_scheduled) {

		spin_unlock(&ubi->wl_lock);

		return 0;

	}

	ubi->wl_scheduled = 1;

	spin_unlock(&ubi->wl_lock);



	wrk = kmalloc(sizeof(struct ubi_work), GFP_NOFS);

	if (!wrk) {

		spin_lock(&ubi->wl_lock);

		ubi->wl_scheduled = 0;

		spin_unlock(&ubi->wl_lock);

		return -ENOMEM;

	}



	wrk->anchor = 1;

	wrk->func = &wear_leveling_worker;

	schedule_ubi_work(ubi, wrk);

	return 0;

}

#endif



/**

 * erase_worker - physical eraseblock erase worker function.

 * @ubi: UBI device description object
@@ -1490,7 +1050,7 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk, 
	dbg_wl("erase PEB %d EC %d LEB %d:%d",

	       pnum, e->ec, wl_wrk->vol_id, wl_wrk->lnum);



	ubi_assert(!ubi_is_fm_block(ubi, e->pnum));

	ubi_assert(!is_fm_block(ubi, e->pnum));



	err = sync_erase(ubi, e, wl_wrk->torture);

	if (!err) {
@@ -1974,7 +1534,7 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai) 


		e->pnum = aeb->pnum;

		e->ec = aeb->ec;

		ubi_assert(!ubi_is_fm_block(ubi, e->pnum));

		ubi_assert(!is_fm_block(ubi, e->pnum));

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

		if (schedule_erase(ubi, e, aeb->vol_id, aeb->lnum, 0)) {

			wl_entry_destroy(ubi, e);
@@ -1995,7 +1555,7 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai) 
		e->pnum = aeb->pnum;

		e->ec = aeb->ec;

		ubi_assert(e->ec >= 0);

		ubi_assert(!ubi_is_fm_block(ubi, e->pnum));

		ubi_assert(!is_fm_block(ubi, e->pnum));



		wl_tree_add(e, &ubi->free);

		ubi->free_count++;
@@ -2095,23 +1655,6 @@ static void protection_queue_destroy(struct ubi_device *ubi) 
	}

}



static void ubi_fastmap_close(struct ubi_device *ubi)

{

#ifdef CONFIG_MTD_UBI_FASTMAP

	int i;



	flush_work(&ubi->fm_work);

	return_unused_pool_pebs(ubi, &ubi->fm_pool);

	return_unused_pool_pebs(ubi, &ubi->fm_wl_pool);



	if (ubi->fm) {

		for (i = 0; i < ubi->fm->used_blocks; i++)

			kfree(ubi->fm->e[i]);

	}

	kfree(ubi->fm);

#endif

}



/**

 * ubi_wl_close - close the wear-leveling sub-system.

 * @ubi: UBI device description object
@@ -2224,3 +1767,94 @@ static int self_check_in_pq(const struct ubi_device *ubi, 
	dump_stack();

	return -EINVAL;

}

#ifndef CONFIG_MTD_UBI_FASTMAP

static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi)

{

	struct ubi_wl_entry *e;



	e = find_wl_entry(ubi, &ubi->free, WL_FREE_MAX_DIFF);

	self_check_in_wl_tree(ubi, e, &ubi->free);

	ubi->free_count--;

	ubi_assert(ubi->free_count >= 0);

	rb_erase(&e->u.rb, &ubi->free);



	return e;

}



/**

 * produce_free_peb - produce a free physical eraseblock.

 * @ubi: UBI device description object

 *

 * This function tries to make a free PEB by means of synchronous execution of

 * pending works. This may be needed if, for example the background thread is

 * disabled. Returns zero in case of success and a negative error code in case

 * of failure.

 */

static int produce_free_peb(struct ubi_device *ubi)

{

	int err;



	while (!ubi->free.rb_node && ubi->works_count) {

		spin_unlock(&ubi->wl_lock);



		dbg_wl("do one work synchronously");

		err = do_work(ubi);



		spin_lock(&ubi->wl_lock);

		if (err)

			return err;

	}



	return 0;

}



/**

 * ubi_wl_get_peb - get a physical eraseblock.

 * @ubi: UBI device description object

 *

 * This function returns a physical eraseblock in case of success and a

 * negative error code in case of failure.

 * Returns with ubi->fm_eba_sem held in read mode!

 */

int ubi_wl_get_peb(struct ubi_device *ubi)

{

	int err;

	struct ubi_wl_entry *e;



retry:

	down_read(&ubi->fm_eba_sem);

	spin_lock(&ubi->wl_lock);

	if (!ubi->free.rb_node) {

		if (ubi->works_count == 0) {

			ubi_err(ubi, "no free eraseblocks");

			ubi_assert(list_empty(&ubi->works));

			spin_unlock(&ubi->wl_lock);

			return -ENOSPC;

		}



		err = produce_free_peb(ubi);

		if (err < 0) {

			spin_unlock(&ubi->wl_lock);

			return err;

		}

		spin_unlock(&ubi->wl_lock);

		up_read(&ubi->fm_eba_sem);

		goto retry;



	}

	e = wl_get_wle(ubi);

	prot_queue_add(ubi, e);

	spin_unlock(&ubi->wl_lock);



	err = ubi_self_check_all_ff(ubi, e->pnum, ubi->vid_hdr_aloffset,

				    ubi->peb_size - ubi->vid_hdr_aloffset);

	if (err) {

		ubi_err(ubi, "new PEB %d does not contain all 0xFF bytes", e->pnum);

		return err;

	}



	return e->pnum;

}

#else

#include "fastmap-wl.c"

#endif

drivers/mtd/ubi/wl.h

0 → 100644
+18 −0
Original line number Diff line number Diff line 
#ifndef UBI_WL_H

#define UBI_WL_H

#ifdef CONFIG_MTD_UBI_FASTMAP

static int is_fm_block(struct ubi_device *ubi, int pnum);

static int anchor_pebs_avalible(struct rb_root *root);

static void update_fastmap_work_fn(struct work_struct *wrk);

static struct ubi_wl_entry *find_anchor_wl_entry(struct rb_root *root);

static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi);

static void ubi_fastmap_close(struct ubi_device *ubi);

#else /* !CONFIG_MTD_UBI_FASTMAP */

static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi);

static inline int is_fm_block(struct ubi_device *ubi, int pnum)

{

	return 0;

}

static inline void ubi_fastmap_close(struct ubi_device *ubi) { }

#endif /* CONFIG_MTD_UBI_FASTMAP */

#endif /* UBI_WL_H */

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