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authorRichard Weinberger <richard@nod.at>2014-11-10 20:21:51 +0300
committerRichard Weinberger <richard@nod.at>2015-03-27 00:47:28 +0300
commit78d6d497a648cc04ae26b27af1e01ce3e41a9c72 (patch)
tree2edaa099bd72458ae3356c92e58c59cb31049d0b /drivers/mtd/ubi/wl.c
parent479c2c0cac0c1d23655df15cf039b4f8e3623d23 (diff)
downloadlinux-78d6d497a648cc04ae26b27af1e01ce3e41a9c72.tar.xz
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: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'drivers/mtd/ubi/wl.c')
-rw-r--r--drivers/mtd/ubi/wl.c560
1 files changed, 97 insertions, 463 deletions
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 83848324daa2..7d49f42ca2d5 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -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
@@ -277,33 +239,6 @@ static int do_work(struct ubi_device *ubi)
}
/**
- * 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
* @root: the root of the tree
@@ -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
*
@@ -541,228 +408,6 @@ static struct ubi_wl_entry *wl_get_wle(struct ubi_device *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.
- * 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
* @pnum: the physical eraseblock to remove
@@ -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