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-rw-r--r--drivers/mtd/ubi/Kconfig21
-rw-r--r--drivers/mtd/ubi/Makefile1
-rw-r--r--drivers/mtd/ubi/attach.c386
-rw-r--r--drivers/mtd/ubi/build.c70
-rw-r--r--drivers/mtd/ubi/eba.c126
-rw-r--r--drivers/mtd/ubi/fastmap.c1537
-rw-r--r--drivers/mtd/ubi/ubi-media.h137
-rw-r--r--drivers/mtd/ubi/ubi.h118
-rw-r--r--drivers/mtd/ubi/wl.c599
9 files changed, 2784 insertions, 211 deletions
diff --git a/drivers/mtd/ubi/Kconfig b/drivers/mtd/ubi/Kconfig
index 271a842f8c3..36663af56d8 100644
--- a/drivers/mtd/ubi/Kconfig
+++ b/drivers/mtd/ubi/Kconfig
@@ -56,6 +56,27 @@ config MTD_UBI_BEB_LIMIT
Leave the default value if unsure.
+config MTD_UBI_FASTMAP
+ bool "UBI Fastmap (Experimental feature)"
+ default n
+ help
+ Important: this feature is experimental so far and the on-flash
+ format for fastmap may change in the next kernel versions
+
+ Fastmap is a mechanism which allows attaching an UBI device
+ in nearly constant time. Instead of scanning the whole MTD device it
+ only has to locate a checkpoint (called fastmap) on the device.
+ The on-flash fastmap contains all information needed to attach
+ the device. Using fastmap makes only sense on large devices where
+ attaching by scanning takes long. UBI will not automatically install
+ a fastmap on old images, but you can set the UBI module parameter
+ fm_autoconvert to 1 if you want so. Please note that fastmap-enabled
+ images are still usable with UBI implementations without
+ fastmap support. On typical flash devices the whole fastmap fits
+ into one PEB. UBI will reserve PEBs to hold two fastmaps.
+
+ If in doubt, say "N".
+
config MTD_UBI_GLUEBI
tristate "MTD devices emulation driver (gluebi)"
help
diff --git a/drivers/mtd/ubi/Makefile b/drivers/mtd/ubi/Makefile
index a0803ac7471..b46b0c97858 100644
--- a/drivers/mtd/ubi/Makefile
+++ b/drivers/mtd/ubi/Makefile
@@ -2,5 +2,6 @@ obj-$(CONFIG_MTD_UBI) += ubi.o
ubi-y += vtbl.o vmt.o upd.o build.o cdev.o kapi.o eba.o io.o wl.o attach.o
ubi-y += misc.o debug.o
+ubi-$(CONFIG_MTD_UBI_FASTMAP) += fastmap.o
obj-$(CONFIG_MTD_UBI_GLUEBI) += gluebi.o
diff --git a/drivers/mtd/ubi/attach.c b/drivers/mtd/ubi/attach.c
index f7adf53e4f4..fec406b4553 100644
--- a/drivers/mtd/ubi/attach.c
+++ b/drivers/mtd/ubi/attach.c
@@ -300,7 +300,7 @@ static struct ubi_ainf_volume *add_volume(struct ubi_attach_info *ai,
}
/**
- * compare_lebs - find out which logical eraseblock is newer.
+ * ubi_compare_lebs - find out which logical eraseblock is newer.
* @ubi: UBI device description object
* @aeb: first logical eraseblock to compare
* @pnum: physical eraseblock number of the second logical eraseblock to
@@ -319,7 +319,7 @@ static struct ubi_ainf_volume *add_volume(struct ubi_attach_info *ai,
* o bit 2 is cleared: the older LEB is not corrupted;
* o bit 2 is set: the older LEB is corrupted.
*/
-static int compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,
+int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,
int pnum, const struct ubi_vid_hdr *vid_hdr)
{
void *buf;
@@ -337,7 +337,7 @@ static int compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,
* support these images anymore. Well, those images still work,
* but only if no unclean reboots happened.
*/
- ubi_err("unsupported on-flash UBI format\n");
+ ubi_err("unsupported on-flash UBI format");
return -EINVAL;
}
@@ -507,7 +507,7 @@ int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,
* sequence numbers. We still can attach these images, unless
* there is a need to distinguish between old and new
* eraseblocks, in which case we'll refuse the image in
- * 'compare_lebs()'. In other words, we attach old clean
+ * 'ubi_compare_lebs()'. In other words, we attach old clean
* images, but refuse attaching old images with duplicated
* logical eraseblocks because there was an unclean reboot.
*/
@@ -523,7 +523,7 @@ int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,
* Now we have to drop the older one and preserve the newer
* one.
*/
- cmp_res = compare_lebs(ubi, aeb, pnum, vid_hdr);
+ cmp_res = ubi_compare_lebs(ubi, aeb, pnum, vid_hdr);
if (cmp_res < 0)
return cmp_res;
@@ -748,7 +748,7 @@ struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi,
/**
* check_corruption - check the data area of PEB.
* @ubi: UBI device description object
- * @vid_hrd: the (corrupted) VID header of this PEB
+ * @vid_hdr: the (corrupted) VID header of this PEB
* @pnum: the physical eraseblock number to check
*
* This is a helper function which is used to distinguish between VID header
@@ -810,6 +810,8 @@ out_unlock:
* @ubi: UBI device description object
* @ai: attaching information
* @pnum: the physical eraseblock number
+ * @vid: The volume ID of the found volume will be stored in this pointer
+ * @sqnum: The sqnum of the found volume will be stored in this pointer
*
* This function reads UBI headers of PEB @pnum, checks them, and adds
* information about this PEB to the corresponding list or RB-tree in the
@@ -817,10 +819,10 @@ out_unlock:
* successfully handled and a negative error code in case of failure.
*/
static int scan_peb(struct ubi_device *ubi, struct ubi_attach_info *ai,
- int pnum)
+ int pnum, int *vid, unsigned long long *sqnum)
{
long long uninitialized_var(ec);
- int err, bitflips = 0, vol_id, ec_err = 0;
+ int err, bitflips = 0, vol_id = -1, ec_err = 0;
dbg_bld("scan PEB %d", pnum);
@@ -991,14 +993,21 @@ static int scan_peb(struct ubi_device *ubi, struct ubi_attach_info *ai,
}
vol_id = be32_to_cpu(vidh->vol_id);
+ if (vid)
+ *vid = vol_id;
+ if (sqnum)
+ *sqnum = be64_to_cpu(vidh->sqnum);
if (vol_id > UBI_MAX_VOLUMES && vol_id != UBI_LAYOUT_VOLUME_ID) {
int lnum = be32_to_cpu(vidh->lnum);
/* Unsupported internal volume */
switch (vidh->compat) {
case UBI_COMPAT_DELETE:
- ubi_msg("\"delete\" compatible internal volume %d:%d found, will remove it",
- vol_id, lnum);
+ if (vol_id != UBI_FM_SB_VOLUME_ID
+ && vol_id != UBI_FM_DATA_VOLUME_ID) {
+ ubi_msg("\"delete\" compatible internal volume %d:%d found, will remove it",
+ vol_id, lnum);
+ }
err = add_to_list(ai, pnum, vol_id, lnum,
ec, 1, &ai->erase);
if (err)
@@ -1121,51 +1130,126 @@ static int late_analysis(struct ubi_device *ubi, struct ubi_attach_info *ai)
}
/**
+ * destroy_av - free volume attaching information.
+ * @av: volume attaching information
+ * @ai: attaching information
+ *
+ * This function destroys the volume attaching information.
+ */
+static void destroy_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av)
+{
+ struct ubi_ainf_peb *aeb;
+ struct rb_node *this = av->root.rb_node;
+
+ while (this) {
+ if (this->rb_left)
+ this = this->rb_left;
+ else if (this->rb_right)
+ this = this->rb_right;
+ else {
+ aeb = rb_entry(this, struct ubi_ainf_peb, u.rb);
+ this = rb_parent(this);
+ if (this) {
+ if (this->rb_left == &aeb->u.rb)
+ this->rb_left = NULL;
+ else
+ this->rb_right = NULL;
+ }
+
+ kmem_cache_free(ai->aeb_slab_cache, aeb);
+ }
+ }
+ kfree(av);
+}
+
+/**
+ * destroy_ai - destroy attaching information.
+ * @ai: attaching information
+ */
+static void destroy_ai(struct ubi_attach_info *ai)
+{
+ struct ubi_ainf_peb *aeb, *aeb_tmp;
+ struct ubi_ainf_volume *av;
+ struct rb_node *rb;
+
+ list_for_each_entry_safe(aeb, aeb_tmp, &ai->alien, u.list) {
+ list_del(&aeb->u.list);
+ kmem_cache_free(ai->aeb_slab_cache, aeb);
+ }
+ list_for_each_entry_safe(aeb, aeb_tmp, &ai->erase, u.list) {
+ list_del(&aeb->u.list);
+ kmem_cache_free(ai->aeb_slab_cache, aeb);
+ }
+ list_for_each_entry_safe(aeb, aeb_tmp, &ai->corr, u.list) {
+ list_del(&aeb->u.list);
+ kmem_cache_free(ai->aeb_slab_cache, aeb);
+ }
+ list_for_each_entry_safe(aeb, aeb_tmp, &ai->free, u.list) {
+ list_del(&aeb->u.list);
+ kmem_cache_free(ai->aeb_slab_cache, aeb);
+ }
+
+ /* Destroy the volume RB-tree */
+ rb = ai->volumes.rb_node;
+ while (rb) {
+ if (rb->rb_left)
+ rb = rb->rb_left;
+ else if (rb->rb_right)
+ rb = rb->rb_right;
+ else {
+ av = rb_entry(rb, struct ubi_ainf_volume, rb);
+
+ rb = rb_parent(rb);
+ if (rb) {
+ if (rb->rb_left == &av->rb)
+ rb->rb_left = NULL;
+ else
+ rb->rb_right = NULL;
+ }
+
+ destroy_av(ai, av);
+ }
+ }
+
+ if (ai->aeb_slab_cache)
+ kmem_cache_destroy(ai->aeb_slab_cache);
+
+ kfree(ai);
+}
+
+/**
* scan_all - scan entire MTD device.
* @ubi: UBI device description object
+ * @ai: attach info object
+ * @start: start scanning at this PEB
*
* This function does full scanning of an MTD device and returns complete
* information about it in form of a "struct ubi_attach_info" object. In case
* of failure, an error code is returned.
*/
-static struct ubi_attach_info *scan_all(struct ubi_device *ubi)
+static int scan_all(struct ubi_device *ubi, struct ubi_attach_info *ai,
+ int start)
{
int err, pnum;
struct rb_node *rb1, *rb2;
struct ubi_ainf_volume *av;
struct ubi_ainf_peb *aeb;
- struct ubi_attach_info *ai;
-
- ai = kzalloc(sizeof(struct ubi_attach_info), GFP_KERNEL);
- if (!ai)
- return ERR_PTR(-ENOMEM);
-
- INIT_LIST_HEAD(&ai->corr);
- INIT_LIST_HEAD(&ai->free);
- INIT_LIST_HEAD(&ai->erase);
- INIT_LIST_HEAD(&ai->alien);
- ai->volumes = RB_ROOT;
err = -ENOMEM;
- ai->aeb_slab_cache = kmem_cache_create("ubi_aeb_slab_cache",
- sizeof(struct ubi_ainf_peb),
- 0, 0, NULL);
- if (!ai->aeb_slab_cache)
- goto out_ai;
ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
if (!ech)
- goto out_ai;
+ return err;
vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
if (!vidh)
goto out_ech;
- for (pnum = 0; pnum < ubi->peb_count; pnum++) {
+ for (pnum = start; pnum < ubi->peb_count; pnum++) {
cond_resched();
dbg_gen("process PEB %d", pnum);
- err = scan_peb(ubi, ai, pnum);
+ err = scan_peb(ubi, ai, pnum, NULL, NULL);
if (err < 0)
goto out_vidh;
}
@@ -1210,32 +1294,144 @@ static struct ubi_attach_info *scan_all(struct ubi_device *ubi)
ubi_free_vid_hdr(ubi, vidh);
kfree(ech);
- return ai;
+ return 0;
out_vidh:
ubi_free_vid_hdr(ubi, vidh);
out_ech:
kfree(ech);
-out_ai:
- ubi_destroy_ai(ai);
- return ERR_PTR(err);
+ return err;
+}
+
+#ifdef CONFIG_MTD_UBI_FASTMAP
+
+/**
+ * scan_fastmap - try to find a fastmap and attach from it.
+ * @ubi: UBI device description object
+ * @ai: attach info object
+ *
+ * Returns 0 on success, negative return values indicate an internal
+ * error.
+ * UBI_NO_FASTMAP denotes that no fastmap was found.
+ * UBI_BAD_FASTMAP denotes that the found fastmap was invalid.
+ */
+static int scan_fast(struct ubi_device *ubi, struct ubi_attach_info *ai)
+{
+ int err, pnum, fm_anchor = -1;
+ unsigned long long max_sqnum = 0;
+
+ err = -ENOMEM;
+
+ ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
+ if (!ech)
+ goto out;
+
+ vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
+ if (!vidh)
+ goto out_ech;
+
+ for (pnum = 0; pnum < UBI_FM_MAX_START; pnum++) {
+ int vol_id = -1;
+ unsigned long long sqnum = -1;
+ cond_resched();
+
+ dbg_gen("process PEB %d", pnum);
+ err = scan_peb(ubi, ai, pnum, &vol_id, &sqnum);
+ if (err < 0)
+ goto out_vidh;
+
+ if (vol_id == UBI_FM_SB_VOLUME_ID && sqnum > max_sqnum) {
+ max_sqnum = sqnum;
+ fm_anchor = pnum;
+ }
+ }
+
+ ubi_free_vid_hdr(ubi, vidh);
+ kfree(ech);
+
+ if (fm_anchor < 0)
+ return UBI_NO_FASTMAP;
+
+ return ubi_scan_fastmap(ubi, ai, fm_anchor);
+
+out_vidh:
+ ubi_free_vid_hdr(ubi, vidh);
+out_ech:
+ kfree(ech);
+out:
+ return err;
+}
+
+#endif
+
+static struct ubi_attach_info *alloc_ai(const char *slab_name)
+{
+ struct ubi_attach_info *ai;
+
+ ai = kzalloc(sizeof(struct ubi_attach_info), GFP_KERNEL);
+ if (!ai)
+ return ai;
+
+ INIT_LIST_HEAD(&ai->corr);
+ INIT_LIST_HEAD(&ai->free);
+ INIT_LIST_HEAD(&ai->erase);
+ INIT_LIST_HEAD(&ai->alien);
+ ai->volumes = RB_ROOT;
+ ai->aeb_slab_cache = kmem_cache_create(slab_name,
+ sizeof(struct ubi_ainf_peb),
+ 0, 0, NULL);
+ if (!ai->aeb_slab_cache) {
+ kfree(ai);
+ ai = NULL;
+ }
+
+ return ai;
}
/**
* ubi_attach - attach an MTD device.
* @ubi: UBI device descriptor
+ * @force_scan: if set to non-zero attach by scanning
*
* This function returns zero in case of success and a negative error code in
* case of failure.
*/
-int ubi_attach(struct ubi_device *ubi)
+int ubi_attach(struct ubi_device *ubi, int force_scan)
{
int err;
struct ubi_attach_info *ai;
- ai = scan_all(ubi);
- if (IS_ERR(ai))
- return PTR_ERR(ai);
+ ai = alloc_ai("ubi_aeb_slab_cache");
+ if (!ai)
+ return -ENOMEM;
+
+#ifdef CONFIG_MTD_UBI_FASTMAP
+ /* On small flash devices we disable fastmap in any case. */
+ if ((int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) <= UBI_FM_MAX_START) {
+ ubi->fm_disabled = 1;
+ force_scan = 1;
+ }
+
+ if (force_scan)
+ err = scan_all(ubi, ai, 0);
+ else {
+ err = scan_fast(ubi, ai);
+ if (err > 0) {
+ if (err != UBI_NO_FASTMAP) {
+ destroy_ai(ai);
+ ai = alloc_ai("ubi_aeb_slab_cache2");
+ if (!ai)
+ return -ENOMEM;
+ }
+
+ err = scan_all(ubi, ai, UBI_FM_MAX_START);
+ }
+ }
+#else
+ err = scan_all(ubi, ai, 0);
+#endif
+ if (err)
+ goto out_ai;
ubi->bad_peb_count = ai->bad_peb_count;
ubi->good_peb_count = ubi->peb_count - ubi->bad_peb_count;
@@ -1256,7 +1452,29 @@ int ubi_attach(struct ubi_device *ubi)
if (err)
goto out_wl;
- ubi_destroy_ai(ai);
+#ifdef CONFIG_MTD_UBI_FASTMAP
+ if (ubi->fm && ubi->dbg->chk_gen) {
+ struct ubi_attach_info *scan_ai;
+
+ scan_ai = alloc_ai("ubi_ckh_aeb_slab_cache");
+ if (!scan_ai)
+ goto out_wl;
+
+ err = scan_all(ubi, scan_ai, 0);
+ if (err) {
+ destroy_ai(scan_ai);
+ goto out_wl;
+ }
+
+ err = self_check_eba(ubi, ai, scan_ai);
+ destroy_ai(scan_ai);
+
+ if (err)
+ goto out_wl;
+ }
+#endif
+
+ destroy_ai(ai);
return 0;
out_wl:
@@ -1265,99 +1483,11 @@ out_vtbl:
ubi_free_internal_volumes(ubi);
vfree(ubi->vtbl);
out_ai:
- ubi_destroy_ai(ai);
+ destroy_ai(ai);
return err;
}
/**
- * destroy_av - free volume attaching information.
- * @av: volume attaching information
- * @ai: attaching information
- *
- * This function destroys the volume attaching information.
- */
-static void destroy_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av)
-{
- struct ubi_ainf_peb *aeb;
- struct rb_node *this = av->root.rb_node;
-
- while (this) {
- if (this->rb_left)
- this = this->rb_left;
- else if (this->rb_right)
- this = this->rb_right;
- else {
- aeb = rb_entry(this, struct ubi_ainf_peb, u.rb);
- this = rb_parent(this);
- if (this) {
- if (this->rb_left == &aeb->u.rb)
- this->rb_left = NULL;
- else
- this->rb_right = NULL;
- }
-
- kmem_cache_free(ai->aeb_slab_cache, aeb);
- }
- }
- kfree(av);
-}
-
-/**
- * ubi_destroy_ai - destroy attaching information.
- * @ai: attaching information
- */
-void ubi_destroy_ai(struct ubi_attach_info *ai)
-{
- struct ubi_ainf_peb *aeb, *aeb_tmp;
- struct ubi_ainf_volume *av;
- struct rb_node *rb;
-
- list_for_each_entry_safe(aeb, aeb_tmp, &ai->alien, u.list) {
- list_del(&aeb->u.list);
- kmem_cache_free(ai->aeb_slab_cache, aeb);
- }
- list_for_each_entry_safe(aeb, aeb_tmp, &ai->erase, u.list) {
- list_del(&aeb->u.list);
- kmem_cache_free(ai->aeb_slab_cache, aeb);
- }
- list_for_each_entry_safe(aeb, aeb_tmp, &ai->corr, u.list) {
- list_del(&aeb->u.list);
- kmem_cache_free(ai->aeb_slab_cache, aeb);
- }
- list_for_each_entry_safe(aeb, aeb_tmp, &ai->free, u.list) {
- list_del(&aeb->u.list);
- kmem_cache_free(ai->aeb_slab_cache, aeb);
- }
-
- /* Destroy the volume RB-tree */
- rb = ai->volumes.rb_node;
- while (rb) {
- if (rb->rb_left)
- rb = rb->rb_left;
- else if (rb->rb_right)
- rb = rb->rb_right;
- else {
- av = rb_entry(rb, struct ubi_ainf_volume, rb);
-
- rb = rb_parent(rb);
- if (rb) {
- if (rb->rb_left == &av->rb)
- rb->rb_left = NULL;
- else
- rb->rb_right = NULL;
- }
-
- destroy_av(ai, av);
- }
- }
-
- if (ai->aeb_slab_cache)
- kmem_cache_destroy(ai->aeb_slab_cache);
-
- kfree(ai);
-}
-
-/**
* self_check_ai - check the attaching information.
* @ubi: UBI device description object
* @ai: attaching information
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 34977039850..344b4cb49d4 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -76,7 +76,10 @@ static int __initdata mtd_devs;
/* MTD devices specification parameters */
static struct mtd_dev_param __initdata mtd_dev_param[UBI_MAX_DEVICES];
-
+#ifdef CONFIG_MTD_UBI_FASTMAP
+/* UBI module parameter to enable fastmap automatically on non-fastmap images */
+static bool fm_autoconvert;
+#endif
/* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
struct class *ubi_class;
@@ -153,6 +156,19 @@ int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype)
ubi_do_get_device_info(ubi, &nt.di);
ubi_do_get_volume_info(ubi, vol, &nt.vi);
+
+#ifdef CONFIG_MTD_UBI_FASTMAP
+ switch (ntype) {
+ case UBI_VOLUME_ADDED:
+ case UBI_VOLUME_REMOVED:
+ case UBI_VOLUME_RESIZED:
+ case UBI_VOLUME_RENAMED:
+ if (ubi_update_fastmap(ubi)) {
+ ubi_err("Unable to update fastmap!");
+ ubi_ro_mode(ubi);
+ }
+ }
+#endif
return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt);
}
@@ -918,10 +934,40 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
ubi->vid_hdr_offset = vid_hdr_offset;
ubi->autoresize_vol_id = -1;
+#ifdef CONFIG_MTD_UBI_FASTMAP
+ ubi->fm_pool.used = ubi->fm_pool.size = 0;
+ ubi->fm_wl_pool.used = ubi->fm_wl_pool.size = 0;
+
+ /*
+ * fm_pool.max_size is 5% of the total number of PEBs but it's also
+ * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE.
+ */
+ ubi->fm_pool.max_size = min(((int)mtd_div_by_eb(ubi->mtd->size,
+ ubi->mtd) / 100) * 5, UBI_FM_MAX_POOL_SIZE);
+ if (ubi->fm_pool.max_size < UBI_FM_MIN_POOL_SIZE)
+ ubi->fm_pool.max_size = UBI_FM_MIN_POOL_SIZE;
+
+ ubi->fm_wl_pool.max_size = UBI_FM_WL_POOL_SIZE;
+ ubi->fm_disabled = !fm_autoconvert;
+
+ if (!ubi->fm_disabled && (int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd)
+ <= UBI_FM_MAX_START) {
+ ubi_err("More than %i PEBs are needed for fastmap, sorry.",
+ UBI_FM_MAX_START);
+ ubi->fm_disabled = 1;
+ }
+
+ ubi_msg("default fastmap pool size: %d", ubi->fm_pool.max_size);
+ ubi_msg("default fastmap WL pool size: %d", ubi->fm_wl_pool.max_size);
+#else
+ ubi->fm_disabled = 1;
+#endif
mutex_init(&ubi->buf_mutex);
mutex_init(&ubi->ckvol_mutex);
mutex_init(&ubi->device_mutex);
spin_lock_init(&ubi->volumes_lock);
+ mutex_init(&ubi->fm_mutex);
+ init_rwsem(&ubi->fm_sem);
ubi_msg("attaching mtd%d to ubi%d", mtd->index, ubi_num);
@@ -934,11 +980,17 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
if (!ubi->peb_buf)
goto out_free;
+#ifdef CONFIG_MTD_UBI_FASTMAP
+ ubi->fm_size = ubi_calc_fm_size(ubi);
+ ubi->fm_buf = vzalloc(ubi->fm_size);
+ if (!ubi->fm_buf)
+ goto out_free;
+#endif
err = ubi_debugging_init_dev(ubi);
if (err)
goto out_free;
- err = ubi_attach(ubi);
+ err = ubi_attach(ubi, 0);
if (err) {
ubi_err("failed to attach mtd%d, error %d", mtd->index, err);
goto out_debugging;
@@ -1012,6 +1064,7 @@ out_debugging:
ubi_debugging_exit_dev(ubi);
out_free:
vfree(ubi->peb_buf);
+ vfree(ubi->fm_buf);
if (ref)
put_device(&ubi->dev);
else
@@ -1061,7 +1114,11 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
ubi_assert(ubi_num == ubi->ubi_num);
ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL);
ubi_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
-
+#ifdef CONFIG_MTD_UBI_FASTMAP
+ /* If we don't write a new fastmap at detach time we lose all
+ * EC updates that have been made since the last written fastmap. */
+ ubi_update_fastmap(ubi);
+#endif
/*
* Before freeing anything, we have to stop the background thread to
* prevent it from doing anything on this device while we are freeing.
@@ -1077,12 +1134,14 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
ubi_debugfs_exit_dev(ubi);
uif_close(ubi);
+
ubi_wl_close(ubi);
ubi_free_internal_volumes(ubi);
vfree(ubi->vtbl);
put_mtd_device(ubi->mtd);
ubi_debugging_exit_dev(ubi);
vfree(ubi->peb_buf);
+ vfree(ubi->fm_buf);
ubi_msg("mtd%d is detached from ubi%d", ubi->mtd->index, ubi->ubi_num);
put_device(&ubi->dev);
return 0;
@@ -1404,7 +1463,10 @@ MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|pa
"Example 2: mtd=content,1984 mtd=4 - attach MTD device with name \"content\" using VID header offset 1984, and MTD device number 4 with default VID header offset.\n"
"Example 3: mtd=/dev/mtd1,0,25 - attach MTD device /dev/mtd1 using default VID header offset and reserve 25*nand_size_in_blocks/1024 erase blocks for bad block handling.\n"
"\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device).");
-
+#ifdef CONFIG_MTD_UBI_FASTMAP
+module_param(fm_autoconvert, bool, 0644);
+MODULE_PARM_DESC(fm_autoconvert, "Set this parameter to enable fastmap automatically on images without a fastmap.");
+#endif
MODULE_VERSION(__stringify(UBI_VERSION));
MODULE_DESCRIPTION("UBI - Unsorted Block Images");
MODULE_AUTHOR("Artem Bityutskiy");
diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index a26d7d25317..0e11671dadc 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -57,7 +57,7 @@
* global sequence counter value. It also increases the global sequence
* counter.
*/
-static unsigned long long next_sqnum(struct ubi_device *ubi)
+unsigned long long ubi_next_sqnum(struct ubi_device *ubi)
{
unsigned long long sqnum;
@@ -340,7 +340,9 @@ int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum);
+ down_read(&ubi->fm_sem);
vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED;
+ up_read(&ubi->fm_sem);
err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 0);
out_unlock:
@@ -521,7 +523,7 @@ retry:
goto out_put;
}
- vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi));
+ vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr);
if (err)
goto write_error;
@@ -548,7 +550,9 @@ retry:
mutex_unlock(&ubi->buf_mutex);
ubi_free_vid_hdr(ubi, vid_hdr);
+ down_read(&ubi->fm_sem);
vol->eba_tbl[lnum] = new_pnum;
+ up_read(&ubi->fm_sem);
ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
ubi_msg("data was successfully recovered");
@@ -632,7 +636,7 @@ int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
}
vid_hdr->vol_type = UBI_VID_DYNAMIC;
- vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi));
+ vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
vid_hdr->vol_id = cpu_to_be32(vol_id);
vid_hdr->lnum = cpu_to_be32(lnum);
vid_hdr->compat = ubi_get_compat(ubi, vol_id);
@@ -665,7 +669,9 @@ retry:
}
}
+ down_read(&ubi->fm_sem);
vol->eba_tbl[lnum] = pnum;
+ up_read(&ubi->fm_sem);
leb_write_unlock(ubi, vol_id, lnum);
ubi_free_vid_hdr(ubi, vid_hdr);
@@ -692,7 +698,7 @@ write_error:
return err;
}
- vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi));
+ vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
ubi_msg("try another PEB");
goto retry;
}
@@ -745,7 +751,7 @@ int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
return err;
}
- vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi));
+ vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
vid_hdr->vol_id = cpu_to_be32(vol_id);
vid_hdr->lnum = cpu_to_be32(lnum);
vid_hdr->compat = ubi_get_compat(ubi, vol_id);
@@ -783,7 +789,9 @@ retry:
}
ubi_assert(vol->eba_tbl[lnum] < 0);
+ down_read(&ubi->fm_sem);
vol->eba_tbl[lnum] = pnum;
+ up_read(&ubi->fm_sem);
leb_write_unlock(ubi, vol_id, lnum);
ubi_free_vid_hdr(ubi, vid_hdr);
@@ -810,7 +818,7 @@ write_error:
return err;
}
- vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi));
+ vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
ubi_msg("try another PEB");
goto retry;
}
@@ -862,7 +870,7 @@ int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
if (err)
goto out_mutex;
- vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi));
+ vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
vid_hdr->vol_id = cpu_to_be32(vol_id);
vid_hdr->lnum = cpu_to_be32(lnum);
vid_hdr->compat = ubi_get_compat(ubi, vol_id);
@@ -904,7 +912,9 @@ retry:
goto out_leb_unlock;
}
+ down_read(&ubi->fm_sem);
vol->eba_tbl[lnum] = pnum;
+ up_read(&ubi->fm_sem);
out_leb_unlock:
leb_write_unlock(ubi, vol_id, lnum);
@@ -930,7 +940,7 @@ write_error:
goto out_leb_unlock;
}
- vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi));
+ vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
ubi_msg("try another PEB");
goto retry;
}
@@ -1089,7 +1099,7 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
vid_hdr->data_size = cpu_to_be32(data_size);
vid_hdr->data_crc = cpu_to_be32(crc);
}
- vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi));
+ vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
err = ubi_io_write_vid_hdr(ubi, to, vid_hdr);
if (err) {
@@ -1151,7 +1161,9 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
}
ubi_assert(vol->eba_tbl[lnum] == from);
+ down_read(&ubi->fm_sem);
vol->eba_tbl[lnum] = to;
+ up_read(&ubi->fm_sem);
out_unlock_buf:
mutex_unlock(&ubi->buf_mutex);
@@ -1202,6 +1214,102 @@ static void print_rsvd_warning(struct ubi_device *ubi,
}
/**
+ * self_check_eba - run a self check on the EBA table constructed by fastmap.
+ * @ubi: UBI device description object
+ * @ai_fastmap: UBI attach info object created by fastmap
+ * @ai_scan: UBI attach info object created by scanning
+ *
+ * Returns < 0 in case of an internal error, 0 otherwise.
+ * If a bad EBA table entry was found it will be printed out and
+ * ubi_assert() triggers.
+ */
+int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
+ struct ubi_attach_info *ai_scan)
+{
+ int i, j, num_volumes, ret = 0;
+ int **scan_eba, **fm_eba;
+ struct ubi_ainf_volume *av;
+ struct ubi_volume *vol;
+ struct ubi_ainf_peb *aeb;
+ struct rb_node *rb;
+
+ num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;
+
+ scan_eba = kmalloc(sizeof(*scan_eba) * num_volumes, GFP_KERNEL);
+ if (!scan_eba)
+ return -ENOMEM;
+
+ fm_eba = kmalloc(sizeof(*fm_eba) * num_volumes, GFP_KERNEL);
+ if (!fm_eba) {
+ kfree(scan_eba);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < num_volumes; i++) {
+ vol = ubi->volumes[i];
+ if (!vol)
+ continue;
+
+ scan_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**scan_eba),
+ GFP_KERNEL);
+ if (!scan_eba[i]) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ fm_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**fm_eba),
+ GFP_KERNEL);
+ if (!fm_eba[i]) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ for (j = 0; j < vol->reserved_pebs; j++)
+ scan_eba[i][j] = fm_eba[i][j] = UBI_LEB_UNMAPPED;
+
+ av = ubi_find_av(ai_scan, idx2vol_id(ubi, i));
+ if (!av)
+ continue;
+
+ ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)
+ scan_eba[i][aeb->lnum] = aeb->pnum;
+
+ av = ubi_find_av(ai_fastmap, idx2vol_id(ubi, i));
+ if (!av)
+ continue;
+
+ ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)
+ fm_eba[i][aeb->lnum] = aeb->pnum;
+
+ for (j = 0; j < vol->reserved_pebs; j++) {
+ if (scan_eba[i][j] != fm_eba[i][j]) {
+ if (scan_eba[i][j] == UBI_LEB_UNMAPPED ||
+ fm_eba[i][j] == UBI_LEB_UNMAPPED)
+ continue;
+
+ ubi_err("LEB:%i:%i is PEB:%i instead of %i!",
+ vol->vol_id, i, fm_eba[i][j],
+ scan_eba[i][j]);
+ ubi_assert(0);
+ }
+ }
+ }
+
+out_free:
+ for (i = 0; i < num_volumes; i++) {
+ if (!ubi->volumes[i])
+ continue;
+
+ kfree(scan_eba[i]);
+ kfree(fm_eba[i]);
+ }
+
+ kfree(scan_eba);
+ kfree(fm_eba);
+ return ret;
+}
+
+/**
* ubi_eba_init - initialize the EBA sub-system using attaching information.
* @ubi: UBI device description object
* @ai: attaching information
diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
new file mode 100644
index 00000000000..1a5f53c090d
--- /dev/null
+++ b/drivers/mtd/ubi/fastmap.c
@@ -0,0 +1,1537 @@
+/*
+ * Copyright (c) 2012 Linutronix 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.
+ *
+ */
+
+#include <linux/crc32.h>
+#include "ubi.h"
+
+/**
+ * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device.
+ * @ubi: UBI device description object
+ */
+size_t ubi_calc_fm_size(struct ubi_device *ubi)
+{
+ size_t size;
+
+ size = sizeof(struct ubi_fm_hdr) + \
+ sizeof(struct ubi_fm_scan_pool) + \
+ sizeof(struct ubi_fm_scan_pool) + \
+ (ubi->peb_count * sizeof(struct ubi_fm_ec)) + \
+ (sizeof(struct ubi_fm_eba) + \
+ (ubi->peb_count * sizeof(__be32))) + \
+ sizeof(struct ubi_fm_volhdr) * UBI_MAX_VOLUMES;
+ return roundup(size, ubi->leb_size);
+}
+
+
+/**
+ * new_fm_vhdr - allocate a new volume header for fastmap usage.
+ * @ubi: UBI device description object
+ * @vol_id: the VID of the new header
+ *
+ * Returns a new struct ubi_vid_hdr on success.
+ * NULL indicates out of memory.
+ */
+static struct ubi_vid_hdr *new_fm_vhdr(struct ubi_device *ubi, int vol_id)
+{
+ struct ubi_vid_hdr *new;
+
+ new = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
+ if (!new)
+ goto out;
+
+ new->vol_type = UBI_VID_DYNAMIC;
+ new->vol_id = cpu_to_be32(vol_id);
+
+ /* UBI implementations without fastmap support have to delete the
+ * fastmap.
+ */
+ new->compat = UBI_COMPAT_DELETE;
+
+out:
+ return new;
+}
+
+/**
+ * add_aeb - create and add a attach erase block to a given list.
+ * @ai: UBI attach info object
+ * @list: the target list
+ * @pnum: PEB number of the new attach erase block
+ * @ec: erease counter of the new LEB
+ * @scrub: scrub this PEB after attaching
+ *
+ * Returns 0 on success, < 0 indicates an internal error.
+ */
+static int add_aeb(struct ubi_attach_info *ai, struct list_head *list,
+ int pnum, int ec, int scrub)
+{
+ struct ubi_ainf_peb *aeb;
+
+ aeb = kmem_cache_alloc(ai->aeb_slab_cache, GFP_KERNEL);
+ if (!aeb)
+ return -ENOMEM;
+
+ aeb->pnum = pnum;
+ aeb->ec = ec;
+ aeb->lnum = -1;
+ aeb->scrub = scrub;
+ aeb->copy_flag = aeb->sqnum = 0;
+
+ ai->ec_sum += aeb->ec;
+ ai->ec_count++;
+
+ if (ai->max_ec < aeb->ec)
+ ai->max_ec = aeb->ec;
+
+ if (ai->min_ec > aeb->ec)
+ ai->min_ec = aeb->ec;
+
+ list_add_tail(&aeb->u.list, list);
+
+ return 0;
+}
+
+/**
+ * add_vol - create and add a new volume to ubi_attach_info.
+ * @ai: ubi_attach_info object
+ * @vol_id: VID of the new volume
+ * @used_ebs: number of used EBS
+ * @data_pad: data padding value of the new volume
+ * @vol_type: volume type
+ * @last_eb_bytes: number of bytes in the last LEB
+ *
+ * Returns the new struct ubi_ainf_volume on success.
+ * NULL indicates an error.
+ */
+static struct ubi_ainf_volume *add_vol(struct ubi_attach_info *ai, int vol_id,
+ int used_ebs, int data_pad, u8 vol_type,
+ int last_eb_bytes)
+{
+ struct ubi_ainf_volume *av;
+ struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
+
+ while (*p) {
+ parent = *p;
+ av = rb_entry(parent, struct ubi_ainf_volume, rb);
+
+ if (vol_id > av->vol_id)
+ p = &(*p)->rb_left;
+ else if (vol_id > av->vol_id)
+ p = &(*p)->rb_right;
+ }
+
+ av = kmalloc(sizeof(struct ubi_ainf_volume), GFP_KERNEL);
+ if (!av)
+ goto out;
+
+ av->highest_lnum = av->leb_count = 0;
+ av->vol_id = vol_id;
+ av->used_ebs = used_ebs;
+ av->data_pad = data_pad;
+ av->last_data_size = last_eb_bytes;
+ av->compat = 0;
+ av->vol_type = vol_type;
+ av->root = RB_ROOT;
+
+ dbg_bld("found volume (ID %i)", vol_id);
+
+ rb_link_node(&av->rb, parent, p);
+ rb_insert_color(&av->rb, &ai->volumes);
+
+out:
+ return av;
+}
+
+/**
+ * assign_aeb_to_av - assigns a SEB to a given ainf_volume and removes it
+ * from it's original list.
+ * @ai: ubi_attach_info object
+ * @aeb: the to be assigned SEB
+ * @av: target scan volume
+ */
+static void assign_aeb_to_av(struct ubi_attach_info *ai,
+ struct ubi_ainf_peb *aeb,
+ struct ubi_ainf_volume *av)
+{
+ struct ubi_ainf_peb *tmp_aeb;
+ struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
+
+ p = &av->root.rb_node;
+ while (*p) {
+ parent = *p;
+
+ tmp_aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
+ if (aeb->lnum != tmp_aeb->lnum) {
+ if (aeb->lnum < tmp_aeb->lnum)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+
+ continue;
+ } else
+ break;
+ }
+
+ list_del(&aeb->u.list);
+ av->leb_count++;
+
+ rb_link_node(&aeb->u.rb, parent, p);
+ rb_insert_color(&aeb->u.rb, &av->root);
+}
+
+/**
+ * update_vol - inserts or updates a LEB which was found a pool.
+ * @ubi: the UBI device object
+ * @ai: attach info object
+ * @av: the volume this LEB belongs to
+ * @new_vh: the volume header derived from new_aeb
+ * @new_aeb: the AEB to be examined
+ *
+ * Returns 0 on success, < 0 indicates an internal error.
+ */
+static int update_vol(struct ubi_device *ubi, struct ubi_attach_info *ai,
+ struct ubi_ainf_volume *av, struct ubi_vid_hdr *new_vh,
+ struct ubi_ainf_peb *new_aeb)
+{
+ struct rb_node **p = &av->root.rb_node, *parent = NULL;
+ struct ubi_ainf_peb *aeb, *victim;
+ int cmp_res;
+
+ while (*p) {
+ parent = *p;
+ aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
+
+ if (be32_to_cpu(new_vh->lnum) != aeb->lnum) {
+ if (be32_to_cpu(new_vh->lnum) < aeb->lnum)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+
+ continue;
+ }
+
+ /* This case can happen if the fastmap gets written
+ * because of a volume change (creation, deletion, ..).
+ * Then a PEB can be within the persistent EBA and the pool.
+ */
+ if (aeb->pnum == new_aeb->pnum) {
+ ubi_assert(aeb->lnum == new_aeb->lnum);
+ kmem_cache_free(ai->aeb_slab_cache, new_aeb);
+
+ return 0;
+ }
+
+ cmp_res = ubi_compare_lebs(ubi, aeb, new_aeb->pnum, new_vh);
+ if (cmp_res < 0)
+ return cmp_res;
+
+ /* new_aeb is newer */
+ if (cmp_res & 1) {
+ victim = kmem_cache_alloc(ai->aeb_slab_cache,
+ GFP_KERNEL);
+ if (!victim)
+ return -ENOMEM;
+
+ victim->ec = aeb->ec;
+ victim->pnum = aeb->pnum;
+ list_add_tail(&victim->u.list, &ai->erase);
+
+ if (av->highest_lnum == be32_to_cpu(new_vh->lnum))
+ av->last_data_size = \
+ be32_to_cpu(new_vh->data_size);
+
+ dbg_bld("vol %i: AEB %i's PEB %i is the newer",
+ av->vol_id, aeb->lnum, new_aeb->pnum);
+
+ aeb->ec = new_aeb->ec;
+ aeb->pnum = new_aeb->pnum;
+ aeb->copy_flag = new_vh->copy_flag;
+ aeb->scrub = new_aeb->scrub;
+ kmem_cache_free(ai->aeb_slab_cache, new_aeb);
+
+ /* new_aeb is older */
+ } else {
+ dbg_bld("vol %i: AEB %i's PEB %i is old, dropping it",
+ av->vol_id, aeb->lnum, new_aeb->pnum);
+ list_add_tail(&new_aeb->u.list, &ai->erase);
+ }
+
+ return 0;
+ }
+ /* This LEB is new, let's add it to the volume */
+
+ if (av->highest_lnum <= be32_to_cpu(new_vh->lnum)) {
+ av->highest_lnum = be32_to_cpu(new_vh->lnum);
+ av->last_data_size = be32_to_cpu(new_vh->data_size);
+ }
+
+ if (av->vol_type == UBI_STATIC_VOLUME)
+ av->used_ebs = be32_to_cpu(new_vh->used_ebs);
+
+ av->leb_count++;
+
+ rb_link_node(&new_aeb->u.rb, parent, p);
+ rb_insert_color(&new_aeb->u.rb, &av->root);
+
+ return 0;
+}
+
+/**
+ * process_pool_aeb - we found a non-empty PEB in a pool.
+ * @ubi: UBI device object
+ * @ai: attach info object
+ * @new_vh: the volume header derived from new_aeb
+ * @new_aeb: the AEB to be examined
+ *
+ * Returns 0 on success, < 0 indicates an internal error.
+ */
+static int process_pool_aeb(struct ubi_device *ubi, struct ubi_attach_info *ai,
+ struct ubi_vid_hdr *new_vh,
+ struct ubi_ainf_peb *new_aeb)
+{
+ struct ubi_ainf_volume *av, *tmp_av = NULL;
+ struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
+ int found = 0;
+
+ if (be32_to_cpu(new_vh->vol_id) == UBI_FM_SB_VOLUME_ID ||
+ be32_to_cpu(new_vh->vol_id) == UBI_FM_DATA_VOLUME_ID) {
+ kmem_cache_free(ai->aeb_slab_cache, new_aeb);
+
+ return 0;
+ }
+
+ /* Find the volume this SEB belongs to */
+ while (*p) {
+ parent = *p;
+ tmp_av = rb_entry(parent, struct ubi_ainf_volume, rb);
+
+ if (be32_to_cpu(new_vh->vol_id) > tmp_av->vol_id)
+ p = &(*p)->rb_left;
+ else if (be32_to_cpu(new_vh->vol_id) < tmp_av->vol_id)
+ p = &(*p)->rb_right;
+ else {
+ found = 1;
+ break;
+ }
+ }
+
+ if (found)
+ av = tmp_av;
+ else {
+ ubi_err("orphaned volume in fastmap pool!");
+ return UBI_BAD_FASTMAP;
+ }
+
+ ubi_assert(be32_to_cpu(new_vh->vol_id) == av->vol_id);
+
+ return update_vol(ubi, ai, av, new_vh, new_aeb);
+}
+
+/**
+ * unmap_peb - unmap a PEB.
+ * If fastmap detects a free PEB in the pool it has to check whether
+ * this PEB has been unmapped after writing the fastmap.
+ *
+ * @ai: UBI attach info object
+ * @pnum: The PEB to be unmapped
+ */
+static void unmap_peb(struct ubi_attach_info *ai, int pnum)
+{
+ struct ubi_ainf_volume *av;
+ struct rb_node *node, *node2;
+ struct ubi_ainf_peb *aeb;
+
+ for (node = rb_first(&ai->volumes); node; node = rb_next(node)) {
+ av = rb_entry(node, struct ubi_ainf_volume, rb);
+
+ for (node2 = rb_first(&av->root); node2;
+ node2 = rb_next(node2)) {
+ aeb = rb_entry(node2, struct ubi_ainf_peb, u.rb);
+ if (aeb->pnum == pnum) {
+ rb_erase(&aeb->u.rb, &av->root);
+ kmem_cache_free(ai->aeb_slab_cache, aeb);
+ return;
+ }
+ }
+ }
+}
+
+/**
+ * scan_pool - scans a pool for changed (no longer empty PEBs).
+ * @ubi: UBI device object
+ * @ai: attach info object
+ * @pebs: an array of all PEB numbers in the to be scanned pool
+ * @pool_size: size of the pool (number of entries in @pebs)
+ * @max_sqnum: pointer to the maximal sequence number
+ * @eba_orphans: list of PEBs which need to be scanned
+ * @free: list of PEBs which are most likely free (and go into @ai->free)
+ *
+ * Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned.
+ * < 0 indicates an internal error.
+ */
+static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
+ int *pebs, int pool_size, unsigned long long *max_sqnum,
+ struct list_head *eba_orphans, struct list_head *free)
+{
+ struct ubi_vid_hdr *vh;
+ struct ubi_ec_hdr *ech;
+ struct ubi_ainf_peb *new_aeb, *tmp_aeb;
+ int i, pnum, err, found_orphan, ret = 0;
+
+ ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
+ if (!ech)
+ return -ENOMEM;
+
+ vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
+ if (!vh) {
+ kfree(ech);
+ return -ENOMEM;
+ }
+
+ dbg_bld("scanning fastmap pool: size = %i", pool_size);
+
+ /*
+ * Now scan all PEBs in the pool to find changes which have been made
+ * after the creation of the fastmap
+ */
+ for (i = 0; i < pool_size; i++) {
+ int scrub = 0;
+
+ pnum = be32_to_cpu(pebs[i]);
+
+ if (ubi_io_is_bad(ubi, pnum)) {
+ ubi_err("bad PEB in fastmap pool!");
+ ret = UBI_BAD_FASTMAP;
+ goto out;
+ }
+
+ err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
+ if (err && err != UBI_IO_BITFLIPS) {
+ ubi_err("unable to read EC header! PEB:%i err:%i",
+ pnum, err);
+ ret = err > 0 ? UBI_BAD_FASTMAP : err;
+ goto out;
+ } else if (ret == UBI_IO_BITFLIPS)
+ scrub = 1;
+
+ if (be32_to_cpu(ech->image_seq) != ubi->image_seq) {
+ ubi_err("bad image seq: 0x%x, expected: 0x%x",
+ be32_to_cpu(ech->image_seq), ubi->image_seq);
+ err = UBI_BAD_FASTMAP;
+ goto out;
+ }
+
+ err = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
+ if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS) {
+ unsigned long long ec = be64_to_cpu(ech->ec);
+ unmap_peb(ai, pnum);
+ dbg_bld("Adding PEB to free: %i", pnum);
+ if (err == UBI_IO_FF_BITFLIPS)
+ add_aeb(ai, free, pnum, ec, 1);
+ else
+ add_aeb(ai, free, pnum, ec, 0);
+ continue;
+ } else if (err == 0 || err == UBI_IO_BITFLIPS) {
+ dbg_bld("Found non empty PEB:%i in pool", pnum);
+
+ if (err == UBI_IO_BITFLIPS)
+ scrub = 1;
+
+ found_orphan = 0;
+ list_for_each_entry(tmp_aeb, eba_orphans, u.list) {
+ if (tmp_aeb->pnum == pnum) {
+ found_orphan = 1;
+ break;
+ }
+ }
+ if (found_orphan) {
+ kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
+ list_del(&tmp_aeb->u.list);
+ }
+
+ new_aeb = kmem_cache_alloc(ai->aeb_slab_cache,
+ GFP_KERNEL);
+ if (!new_aeb) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ new_aeb->ec = be64_to_cpu(ech->ec);
+ new_aeb->pnum = pnum;
+ new_aeb->lnum = be32_to_cpu(vh->lnum);
+ new_aeb->sqnum = be64_to_cpu(vh->sqnum);
+ new_aeb->copy_flag = vh->copy_flag;
+ new_aeb->scrub = scrub;
+
+ if (*max_sqnum < new_aeb->sqnum)
+ *max_sqnum = new_aeb->sqnum;
+
+ err = process_pool_aeb(ubi, ai, vh, new_aeb);
+ if (err) {
+ ret = err > 0 ? UBI_BAD_FASTMAP : err;
+ goto out;
+ }
+ } else {
+ /* We are paranoid and fall back to scanning mode */
+ ubi_err("fastmap pool PEBs contains damaged PEBs!");
+ ret = err > 0 ? UBI_BAD_FASTMAP : err;
+ goto out;
+ }
+
+ }
+
+out:
+ ubi_free_vid_hdr(ubi, vh);
+ kfree(ech);
+ return ret;
+}
+
+/**
+ * count_fastmap_pebs - Counts the PEBs found by fastmap.
+ * @ai: The UBI attach info object
+ */
+static int count_fastmap_pebs(struct ubi_attach_info *ai)
+{
+ struct ubi_ainf_peb *aeb;
+ struct ubi_ainf_volume *av;
+ struct rb_node *rb1, *rb2;
+ int n = 0;
+
+ list_for_each_entry(aeb, &ai->erase, u.list)
+ n++;
+
+ list_for_each_entry(aeb, &ai->free, u.list)
+ n++;
+
+ ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb)
+ ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb)
+ n++;
+
+ return n;
+}
+
+/**
+ * ubi_attach_fastmap - creates ubi_attach_info from a fastmap.
+ * @ubi: UBI device object
+ * @ai: UBI attach info object
+ * @fm: the fastmap to be attached
+ *
+ * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable.
+ * < 0 indicates an internal error.
+ */
+static int ubi_attach_fastmap(struct ubi_device *ubi,
+ struct ubi_attach_info *ai,
+ struct ubi_fastmap_layout *fm)
+{
+ struct list_head used, eba_orphans, free;
+ struct ubi_ainf_volume *av;
+ struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb;
+ struct ubi_ec_hdr *ech;
+ struct ubi_fm_sb *fmsb;
+ struct ubi_fm_hdr *fmhdr;
+ struct ubi_fm_scan_pool *fmpl1, *fmpl2;
+ struct ubi_fm_ec *fmec;
+ struct ubi_fm_volhdr *fmvhdr;
+ struct ubi_fm_eba *fm_eba;
+ int ret, i, j, pool_size, wl_pool_size;
+ size_t fm_pos = 0, fm_size = ubi->fm_size;
+ unsigned long long max_sqnum = 0;
+ void *fm_raw = ubi->fm_buf;
+
+ INIT_LIST_HEAD(&used);
+ INIT_LIST_HEAD(&free);
+ INIT_LIST_HEAD(&eba_orphans);
+ INIT_LIST_HEAD(&ai->corr);
+ INIT_LIST_HEAD(&ai->free);
+ INIT_LIST_HEAD(&ai->erase);
+ INIT_LIST_HEAD(&ai->alien);
+ ai->volumes = RB_ROOT;
+ ai->min_ec = UBI_MAX_ERASECOUNTER;
+
+ ai->aeb_slab_cache = kmem_cache_create("ubi_ainf_peb_slab",
+ sizeof(struct ubi_ainf_peb),
+ 0, 0, NULL);
+ if (!ai->aeb_slab_cache) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ fmsb = (struct ubi_fm_sb *)(fm_raw);
+ ai->max_sqnum = fmsb->sqnum;
+ fm_pos += sizeof(struct ubi_fm_sb);
+ if (fm_pos >= fm_size)
+ goto fail_bad;
+
+ fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fmhdr);
+ if (fm_pos >= fm_size)
+ goto fail_bad;
+
+ if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) {
+ ubi_err("bad fastmap header magic: 0x%x, expected: 0x%x",
+ be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
+ goto fail_bad;
+ }
+
+ fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fmpl1);
+ if (fm_pos >= fm_size)
+ goto fail_bad;
+ if (be32_to_cpu(fmpl1->magic) != UBI_FM_POOL_MAGIC) {
+ ubi_err("bad fastmap pool magic: 0x%x, expected: 0x%x",
+ be32_to_cpu(fmpl1->magic), UBI_FM_POOL_MAGIC);
+ goto fail_bad;
+ }
+
+ fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fmpl2);
+ if (fm_pos >= fm_size)
+ goto fail_bad;
+ if (be32_to_cpu(fmpl2->magic) != UBI_FM_POOL_MAGIC) {
+ ubi_err("bad fastmap pool magic: 0x%x, expected: 0x%x",
+ be32_to_cpu(fmpl2->magic), UBI_FM_POOL_MAGIC);
+ goto fail_bad;
+ }
+
+ pool_size = be16_to_cpu(fmpl1->size);
+ wl_pool_size = be16_to_cpu(fmpl2->size);
+ fm->max_pool_size = be16_to_cpu(fmpl1->max_size);
+ fm->max_wl_pool_size = be16_to_cpu(fmpl2->max_size);
+
+ if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
+ ubi_err("bad pool size: %i", pool_size);
+ goto fail_bad;
+ }
+
+ if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
+ ubi_err("bad WL pool size: %i", wl_pool_size);
+ goto fail_bad;
+ }
+
+
+ if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE ||
+ fm->max_pool_size < 0) {
+ ubi_err("bad maximal pool size: %i", fm->max_pool_size);
+ goto fail_bad;
+ }
+
+ if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE ||
+ fm->max_wl_pool_size < 0) {
+ ubi_err("bad maximal WL pool size: %i", fm->max_wl_pool_size);
+ goto fail_bad;
+ }
+
+ /* read EC values from free list */
+ for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) {
+ fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fmec);
+ if (fm_pos >= fm_size)
+ goto fail_bad;
+
+ add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum),
+ be32_to_cpu(fmec->ec), 0);
+ }
+
+ /* read EC values from used list */
+ for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) {
+ fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fmec);
+ if (fm_pos >= fm_size)
+ goto fail_bad;
+
+ add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
+ be32_to_cpu(fmec->ec), 0);
+ }
+
+ /* read EC values from scrub list */
+ for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) {
+ fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fmec);
+ if (fm_pos >= fm_size)
+ goto fail_bad;
+
+ add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
+ be32_to_cpu(fmec->ec), 1);
+ }
+
+ /* read EC values from erase list */
+ for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) {
+ fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fmec);
+ if (fm_pos >= fm_size)
+ goto fail_bad;
+
+ add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum),
+ be32_to_cpu(fmec->ec), 1);
+ }
+
+ ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
+ ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
+
+ /* Iterate over all volumes and read their EBA table */
+ for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
+ fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fmvhdr);
+ if (fm_pos >= fm_size)
+ goto fail_bad;
+
+ if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) {
+ ubi_err("bad fastmap vol header magic: 0x%x, " \
+ "expected: 0x%x",
+ be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
+ goto fail_bad;
+ }
+
+ av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id),
+ be32_to_cpu(fmvhdr->used_ebs),
+ be32_to_cpu(fmvhdr->data_pad),
+ fmvhdr->vol_type,
+ be32_to_cpu(fmvhdr->last_eb_bytes));
+
+ if (!av)
+ goto fail_bad;
+
+ ai->vols_found++;
+ if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id))
+ ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id);
+
+ fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fm_eba);
+ fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs));
+ if (fm_pos >= fm_size)
+ goto fail_bad;
+
+ if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) {
+ ubi_err("bad fastmap EBA header magic: 0x%x, " \
+ "expected: 0x%x",
+ be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
+ goto fail_bad;
+ }
+
+ for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) {
+ int pnum = be32_to_cpu(fm_eba->pnum[j]);
+
+ if ((int)be32_to_cpu(fm_eba->pnum[j]) < 0)
+ continue;
+
+ aeb = NULL;
+ list_for_each_entry(tmp_aeb, &used, u.list) {
+ if (tmp_aeb->pnum == pnum)
+ aeb = tmp_aeb;
+ }
+
+ /* This can happen if a PEB is already in an EBA known
+ * by this fastmap but the PEB itself is not in the used
+ * list.
+ * In this case the PEB can be within the fastmap pool
+ * or while writing the fastmap it was in the protection
+ * queue.
+ */
+ if (!aeb) {
+ aeb = kmem_cache_alloc(ai->aeb_slab_cache,
+ GFP_KERNEL);
+ if (!aeb) {
+ ret = -ENOMEM;
+
+ goto fail;
+ }
+
+ aeb->lnum = j;
+ aeb->pnum = be32_to_cpu(fm_eba->pnum[j]);
+ aeb->ec = -1;
+ aeb->scrub = aeb->copy_flag = aeb->sqnum = 0;
+ list_add_tail(&aeb->u.list, &eba_orphans);
+ continue;
+ }
+
+ aeb->lnum = j;
+
+ if (av->highest_lnum <= aeb->lnum)
+ av->highest_lnum = aeb->lnum;
+
+ assign_aeb_to_av(ai, aeb, av);
+
+ dbg_bld("inserting PEB:%i (LEB %i) to vol %i",
+ aeb->pnum, aeb->lnum, av->vol_id);
+ }
+
+ ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
+ if (!ech) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &eba_orphans,
+ u.list) {
+ int err;
+
+ if (ubi_io_is_bad(ubi, tmp_aeb->pnum)) {
+ ubi_err("bad PEB in fastmap EBA orphan list");
+ ret = UBI_BAD_FASTMAP;
+ kfree(ech);
+ goto fail;
+ }
+
+ err = ubi_io_read_ec_hdr(ubi, tmp_aeb->pnum, ech, 0);
+ if (err && err != UBI_IO_BITFLIPS) {
+ ubi_err("unable to read EC header! PEB:%i " \
+ "err:%i", tmp_aeb->pnum, err);
+ ret = err > 0 ? UBI_BAD_FASTMAP : err;
+ kfree(ech);
+
+ goto fail;
+ } else if (err == UBI_IO_BITFLIPS)
+ tmp_aeb->scrub = 1;
+
+ tmp_aeb->ec = be64_to_cpu(ech->ec);
+ assign_aeb_to_av(ai, tmp_aeb, av);
+ }
+
+ kfree(ech);
+ }
+
+ ret = scan_pool(ubi, ai, fmpl1->pebs, pool_size, &max_sqnum,
+ &eba_orphans, &free);
+ if (ret)
+ goto fail;
+
+ ret = scan_pool(ubi, ai, fmpl2->pebs, wl_pool_size, &max_sqnum,
+ &eba_orphans, &free);
+ if (ret)
+ goto fail;
+
+ if (max_sqnum > ai->max_sqnum)
+ ai->max_sqnum = max_sqnum;
+
+ list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
+ list_del(&tmp_aeb->u.list);
+ list_add_tail(&tmp_aeb->u.list, &ai->free);
+ }
+
+ /*
+ * If fastmap is leaking PEBs (must not happen), raise a
+ * fat warning and fall back to scanning mode.
+ * We do this here because in ubi_wl_init() it's too late
+ * and we cannot fall back to scanning.
+ */
+ if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count -
+ ai->bad_peb_count - fm->used_blocks))
+ goto fail_bad;
+
+ return 0;
+
+fail_bad:
+ ret = UBI_BAD_FASTMAP;
+fail:
+ return ret;
+}
+
+/**
+ * ubi_scan_fastmap - scan the fastmap.
+ * @ubi: UBI device object
+ * @ai: UBI attach info to be filled
+ * @fm_anchor: The fastmap starts at this PEB
+ *
+ * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found,
+ * UBI_BAD_FASTMAP if one was found but is not usable.
+ * < 0 indicates an internal error.
+ */
+int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
+ int fm_anchor)
+{
+ struct ubi_fm_sb *fmsb, *fmsb2;
+ struct ubi_vid_hdr *vh;
+ struct ubi_ec_hdr *ech;
+ struct ubi_fastmap_layout *fm;
+ int i, used_blocks, pnum, ret = 0;
+ size_t fm_size;
+ __be32 crc, tmp_crc;
+ unsigned long long sqnum = 0;
+
+ mutex_lock(&ubi->fm_mutex);
+ memset(ubi->fm_buf, 0, ubi->fm_size);
+
+ fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL);
+ if (!fmsb) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ fm = kzalloc(sizeof(*fm), GFP_KERNEL);
+ if (!fm) {
+ ret = -ENOMEM;
+ kfree(fmsb);
+ goto out;
+ }
+
+ ret = ubi_io_read(ubi, fmsb, fm_anchor, ubi->leb_start, sizeof(*fmsb));
+ if (ret && ret != UBI_IO_BITFLIPS)
+ goto free_fm_sb;
+ else if (ret == UBI_IO_BITFLIPS)
+ fm->to_be_tortured[0] = 1;
+
+ if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) {
+ ubi_err("bad super block magic: 0x%x, expected: 0x%x",
+ be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC);
+ ret = UBI_BAD_FASTMAP;
+ goto free_fm_sb;
+ }
+
+ if (fmsb->version != UBI_FM_FMT_VERSION) {
+ ubi_err("bad fastmap version: %i, expected: %i",
+ fmsb->version, UBI_FM_FMT_VERSION);
+ ret = UBI_BAD_FASTMAP;
+ goto free_fm_sb;
+ }
+
+ used_blocks = be32_to_cpu(fmsb->used_blocks);
+ if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) {
+ ubi_err("number of fastmap blocks is invalid: %i", used_blocks);
+ ret = UBI_BAD_FASTMAP;
+ goto free_fm_sb;
+ }
+
+ fm_size = ubi->leb_size * used_blocks;
+ if (fm_size != ubi->fm_size) {
+ ubi_err("bad fastmap size: %zi, expected: %zi", fm_size,
+ ubi->fm_size);
+ ret = UBI_BAD_FASTMAP;
+ goto free_fm_sb;
+ }
+
+ ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
+ if (!ech) {
+ ret = -ENOMEM;
+ goto free_fm_sb;
+ }
+
+ vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
+ if (!vh) {
+ ret = -ENOMEM;
+ goto free_hdr;
+ }
+
+ for (i = 0; i < used_blocks; i++) {
+ pnum = be32_to_cpu(fmsb->block_loc[i]);
+
+ if (ubi_io_is_bad(ubi, pnum)) {
+ ret = UBI_BAD_FASTMAP;
+ goto free_hdr;
+ }
+
+ ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
+ if (ret && ret != UBI_IO_BITFLIPS) {
+ ubi_err("unable to read fastmap block# %i EC (PEB: %i)",
+ i, pnum);
+ if (ret > 0)
+ ret = UBI_BAD_FASTMAP;
+ goto free_hdr;
+ } else if (ret == UBI_IO_BITFLIPS)
+ fm->to_be_tortured[i] = 1;
+
+ if (!ubi->image_seq)
+ ubi->image_seq = be32_to_cpu(ech->image_seq);
+
+ if (be32_to_cpu(ech->image_seq) != ubi->image_seq) {
+ ret = UBI_BAD_FASTMAP;
+ goto free_hdr;
+ }
+
+ ret = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
+ if (ret && ret != UBI_IO_BITFLIPS) {
+ ubi_err("unable to read fastmap block# %i (PEB: %i)",
+ i, pnum);
+ goto free_hdr;
+ }
+
+ if (i == 0) {
+ if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) {
+ ubi_err("bad fastmap anchor vol_id: 0x%x," \
+ " expected: 0x%x",
+ be32_to_cpu(vh->vol_id),
+ UBI_FM_SB_VOLUME_ID);
+ ret = UBI_BAD_FASTMAP;
+ goto free_hdr;
+ }
+ } else {
+ if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) {
+ ubi_err("bad fastmap data vol_id: 0x%x," \
+ " expected: 0x%x",
+ be32_to_cpu(vh->vol_id),
+ UBI_FM_DATA_VOLUME_ID);
+ ret = UBI_BAD_FASTMAP;
+ goto free_hdr;
+ }
+ }
+
+ if (sqnum < be64_to_cpu(vh->sqnum))
+ sqnum = be64_to_cpu(vh->sqnum);
+
+ ret = ubi_io_read(ubi, ubi->fm_buf + (ubi->leb_size * i), pnum,
+ ubi->leb_start, ubi->leb_size);
+ if (ret && ret != UBI_IO_BITFLIPS) {
+ ubi_err("unable to read fastmap block# %i (PEB: %i, " \
+ "err: %i)", i, pnum, ret);
+ goto free_hdr;
+ }
+ }
+
+ kfree(fmsb);
+ fmsb = NULL;
+
+ fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf);
+ tmp_crc = be32_to_cpu(fmsb2->data_crc);
+ fmsb2->data_crc = 0;
+ crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size);
+ if (crc != tmp_crc) {
+ ubi_err("fastmap data CRC is invalid");
+ ubi_err("CRC should be: 0x%x, calc: 0x%x", tmp_crc, crc);
+ ret = UBI_BAD_FASTMAP;
+ goto free_hdr;
+ }
+
+ fmsb2->sqnum = sqnum;
+
+ fm->used_blocks = used_blocks;
+
+ ret = ubi_attach_fastmap(ubi, ai, fm);
+ if (ret) {
+ if (ret > 0)
+ ret = UBI_BAD_FASTMAP;
+ goto free_hdr;
+ }
+
+ for (i = 0; i < used_blocks; i++) {
+ struct ubi_wl_entry *e;
+
+ e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
+ if (!e) {
+ while (i--)
+ kfree(fm->e[i]);
+
+ ret = -ENOMEM;
+ goto free_hdr;
+ }
+
+ e->pnum = be32_to_cpu(fmsb2->block_loc[i]);
+ e->ec = be32_to_cpu(fmsb2->block_ec[i]);
+ fm->e[i] = e;
+ }
+
+ ubi->fm = fm;
+ ubi->fm_pool.max_size = ubi->fm->max_pool_size;
+ ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size;
+ ubi_msg("attached by fastmap");
+ ubi_msg("fastmap pool size: %d", ubi->fm_pool.max_size);
+ ubi_msg("fastmap WL pool size: %d", ubi->fm_wl_pool.max_size);
+ ubi->fm_disabled = 0;
+
+ ubi_free_vid_hdr(ubi, vh);
+ kfree(ech);
+out:
+ mutex_unlock(&ubi->fm_mutex);
+ if (ret == UBI_BAD_FASTMAP)
+ ubi_err("Attach by fastmap failed, doing a full scan!");
+ return ret;
+
+free_hdr:
+ ubi_free_vid_hdr(ubi, vh);
+ kfree(ech);
+free_fm_sb:
+ kfree(fmsb);
+ kfree(fm);
+ goto out;
+}
+
+/**
+ * ubi_write_fastmap - writes a fastmap.
+ * @ubi: UBI device object
+ * @new_fm: the to be written fastmap
+ *
+ * Returns 0 on success, < 0 indicates an internal error.
+ */
+static int ubi_write_fastmap(struct ubi_device *ubi,
+ struct ubi_fastmap_layout *new_fm)
+{
+ size_t fm_pos = 0;
+ void *fm_raw;
+ struct ubi_fm_sb *fmsb;
+ struct ubi_fm_hdr *fmh;
+ struct ubi_fm_scan_pool *fmpl1, *fmpl2;
+ struct ubi_fm_ec *fec;
+ struct ubi_fm_volhdr *fvh;
+ struct ubi_fm_eba *feba;
+ struct rb_node *node;
+ struct ubi_wl_entry *wl_e;
+ struct ubi_volume *vol;
+ struct ubi_vid_hdr *avhdr, *dvhdr;
+ struct ubi_work *ubi_wrk;
+ int ret, i, j, free_peb_count, used_peb_count, vol_count;
+ int scrub_peb_count, erase_peb_count;
+
+ fm_raw = ubi->fm_buf;
+ memset(ubi->fm_buf, 0, ubi->fm_size);
+
+ avhdr = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
+ if (!avhdr) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ dvhdr = new_fm_vhdr(ubi, UBI_FM_DATA_VOLUME_ID);
+ if (!dvhdr) {
+ ret = -ENOMEM;
+ goto out_kfree;
+ }
+
+ spin_lock(&ubi->volumes_lock);
+ spin_lock(&ubi->wl_lock);
+
+ fmsb = (struct ubi_fm_sb *)fm_raw;
+ fm_pos += sizeof(*fmsb);
+ ubi_assert(fm_pos <= ubi->fm_size);
+
+ fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fmh);
+ ubi_assert(fm_pos <= ubi->fm_size);
+
+ fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC);
+ fmsb->version = UBI_FM_FMT_VERSION;
+ fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks);
+ /* the max sqnum will be filled in while *reading* the fastmap */
+ fmsb->sqnum = 0;
+
+ fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC);
+ free_peb_count = 0;
+ used_peb_count = 0;
+ scrub_peb_count = 0;
+ erase_peb_count = 0;
+ vol_count = 0;
+
+ fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fmpl1);
+ fmpl1->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
+ fmpl1->size = cpu_to_be16(ubi->fm_pool.size);
+ fmpl1->max_size = cpu_to_be16(ubi->fm_pool.max_size);
+
+ for (i = 0; i < ubi->fm_pool.size; i++)
+ fmpl1->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]);
+
+ fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fmpl2);
+ fmpl2->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
+ fmpl2->size = cpu_to_be16(ubi->fm_wl_pool.size);
+ fmpl2->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size);
+
+ for (i = 0; i < ubi->fm_wl_pool.size; i++)
+ fmpl2->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]);
+
+ for (node = rb_first(&ubi->free); node; node = rb_next(node)) {
+ wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
+ fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
+
+ fec->pnum = cpu_to_be32(wl_e->pnum);
+ fec->ec = cpu_to_be32(wl_e->ec);
+
+ free_peb_count++;
+ fm_pos += sizeof(*fec);
+ ubi_assert(fm_pos <= ubi->fm_size);
+ }
+ fmh->free_peb_count = cpu_to_be32(free_peb_count);
+
+ for (node = rb_first(&ubi->used); node; node = rb_next(node)) {
+ wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
+ fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
+
+ fec->pnum = cpu_to_be32(wl_e->pnum);
+ fec->ec = cpu_to_be32(wl_e->ec);
+
+ used_peb_count++;
+ fm_pos += sizeof(*fec);
+ ubi_assert(fm_pos <= ubi->fm_size);
+ }
+ fmh->used_peb_count = cpu_to_be32(used_peb_count);
+
+ for (node = rb_first(&ubi->scrub); node; node = rb_next(node)) {
+ wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
+ fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
+
+ fec->pnum = cpu_to_be32(wl_e->pnum);
+ fec->ec = cpu_to_be32(wl_e->ec);
+
+ scrub_peb_count++;
+ fm_pos += sizeof(*fec);
+ ubi_assert(fm_pos <= ubi->fm_size);
+ }
+ fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count);
+
+
+ list_for_each_entry(ubi_wrk, &ubi->works, list) {
+ if (ubi_is_erase_work(ubi_wrk)) {
+ wl_e = ubi_wrk->e;
+ ubi_assert(wl_e);
+
+ fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
+
+ fec->pnum = cpu_to_be32(wl_e->pnum);
+ fec->ec = cpu_to_be32(wl_e->ec);
+
+ erase_peb_count++;
+ fm_pos += sizeof(*fec);
+ ubi_assert(fm_pos <= ubi->fm_size);
+ }
+ }
+ fmh->erase_peb_count = cpu_to_be32(erase_peb_count);
+
+ for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) {
+ vol = ubi->volumes[i];
+
+ if (!vol)
+ continue;
+
+ vol_count++;
+
+ fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*fvh);
+ ubi_assert(fm_pos <= ubi->fm_size);
+
+ fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC);
+ fvh->vol_id = cpu_to_be32(vol->vol_id);
+ fvh->vol_type = vol->vol_type;
+ fvh->used_ebs = cpu_to_be32(vol->used_ebs);
+ fvh->data_pad = cpu_to_be32(vol->data_pad);
+ fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes);
+
+ ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME ||
+ vol->vol_type == UBI_STATIC_VOLUME);
+
+ feba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
+ fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs);
+ ubi_assert(fm_pos <= ubi->fm_size);
+
+ for (j = 0; j < vol->reserved_pebs; j++)
+ feba->pnum[j] = cpu_to_be32(vol->eba_tbl[j]);
+
+ feba->reserved_pebs = cpu_to_be32(j);
+ feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC);
+ }
+ fmh->vol_count = cpu_to_be32(vol_count);
+ fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count);
+
+ avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
+ avhdr->lnum = 0;
+
+ spin_unlock(&ubi->wl_lock);
+ spin_unlock(&ubi->volumes_lock);
+
+ dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum);
+ ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avhdr);
+ if (ret) {
+ ubi_err("unable to write vid_hdr to fastmap SB!");
+ goto out_kfree;
+ }
+
+ for (i = 0; i < new_fm->used_blocks; i++) {
+ fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum);
+ fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec);
+ }
+
+ fmsb->data_crc = 0;
+ fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw,
+ ubi->fm_size));
+
+ for (i = 1; i < new_fm->used_blocks; i++) {
+ dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
+ dvhdr->lnum = cpu_to_be32(i);
+ dbg_bld("writing fastmap data to PEB %i sqnum %llu",
+ new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum));
+ ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvhdr);
+ if (ret) {
+ ubi_err("unable to write vid_hdr to PEB %i!",
+ new_fm->e[i]->pnum);
+ goto out_kfree;
+ }
+ }
+
+ for (i = 0; i < new_fm->used_blocks; i++) {
+ ret = ubi_io_write(ubi, fm_raw + (i * ubi->leb_size),
+ new_fm->e[i]->pnum, ubi->leb_start, ubi->leb_size);
+ if (ret) {
+ ubi_err("unable to write fastmap to PEB %i!",
+ new_fm->e[i]->pnum);
+ goto out_kfree;
+ }
+ }
+
+ ubi_assert(new_fm);
+ ubi->fm = new_fm;
+
+ dbg_bld("fastmap written!");
+
+out_kfree:
+ ubi_free_vid_hdr(ubi, avhdr);
+ ubi_free_vid_hdr(ubi, dvhdr);
+out:
+ return ret;
+}
+
+/**
+ * erase_block - Manually erase a PEB.
+ * @ubi: UBI device object
+ * @pnum: PEB to be erased
+ *
+ * Returns the new EC value on success, < 0 indicates an internal error.
+ */
+static int erase_block(struct ubi_device *ubi, int pnum)
+{
+ int ret;
+ struct ubi_ec_hdr *ec_hdr;
+ long long ec;
+
+ ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
+ if (!ec_hdr)
+ return -ENOMEM;
+
+ ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0);
+ if (ret < 0)
+ goto out;
+ else if (ret && ret != UBI_IO_BITFLIPS) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = ubi_io_sync_erase(ubi, pnum, 0);
+ if (ret < 0)
+ goto out;
+
+ ec = be64_to_cpu(ec_hdr->ec);
+ ec += ret;
+ if (ec > UBI_MAX_ERASECOUNTER) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ec_hdr->ec = cpu_to_be64(ec);
+ ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr);
+ if (ret < 0)
+ goto out;
+
+ ret = ec;
+out:
+ kfree(ec_hdr);
+ return ret;
+}
+
+/**
+ * invalidate_fastmap - destroys a fastmap.
+ * @ubi: UBI device object
+ * @fm: the fastmap to be destroyed
+ *
+ * Returns 0 on success, < 0 indicates an internal error.
+ */
+static int invalidate_fastmap(struct ubi_device *ubi,
+ struct ubi_fastmap_layout *fm)
+{
+ int ret, i;
+ struct ubi_vid_hdr *vh;
+
+ ret = erase_block(ubi, fm->e[0]->pnum);
+ if (ret < 0)
+ return ret;
+
+ vh = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
+ if (!vh)
+ return -ENOMEM;
+
+ /* deleting the current fastmap SB is not enough, an old SB may exist,
+ * so create a (corrupted) SB such that fastmap will find it and fall
+ * back to scanning mode in any case */
+ vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
+ ret = ubi_io_write_vid_hdr(ubi, fm->e[0]->pnum, vh);
+
+ for (i = 0; i < fm->used_blocks; i++)
+ ubi_wl_put_fm_peb(ubi, fm->e[i], i, fm->to_be_tortured[i]);
+
+ return ret;
+}
+
+/**
+ * ubi_update_fastmap - will be called by UBI if a volume changes or
+ * a fastmap pool becomes full.
+ * @ubi: UBI device object
+ *
+ * Returns 0 on success, < 0 indicates an internal error.
+ */
+int ubi_update_fastmap(struct ubi_device *ubi)
+{
+ int ret, i;
+ struct ubi_fastmap_layout *new_fm, *old_fm;
+ struct ubi_wl_entry *tmp_e;
+
+ mutex_lock(&ubi->fm_mutex);
+
+ ubi_refill_pools(ubi);
+
+ if (ubi->ro_mode || ubi->fm_disabled) {
+ mutex_unlock(&ubi->fm_mutex);
+ return 0;
+ }
+
+ ret = ubi_ensure_anchor_pebs(ubi);
+ if (ret) {
+ mutex_unlock(&ubi->fm_mutex);
+ return ret;
+ }
+
+ new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL);
+ if (!new_fm) {
+ mutex_unlock(&ubi->fm_mutex);
+ return -ENOMEM;
+ }
+
+ new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
+
+ for (i = 0; i < new_fm->used_blocks; i++) {
+ new_fm->e[i] = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
+ if (!new_fm->e[i]) {
+ while (i--)
+ kfree(new_fm->e[i]);
+
+ kfree(new_fm);
+ mutex_unlock(&ubi->fm_mutex);
+ return -ENOMEM;
+ }
+ }
+
+ old_fm = ubi->fm;
+ ubi->fm = NULL;
+
+ if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) {
+ ubi_err("fastmap too large");
+ ret = -ENOSPC;
+ goto err;
+ }
+
+ for (i = 1; i < new_fm->used_blocks; i++) {
+ spin_lock(&ubi->wl_lock);
+ tmp_e = ubi_wl_get_fm_peb(ubi, 0);
+ spin_unlock(&ubi->wl_lock);
+
+ if (!tmp_e && !old_fm) {
+ int j;
+ ubi_err("could not get any free erase block");
+
+ for (j = 1; j < i; j++)
+ ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0);
+
+ ret = -ENOSPC;
+ goto err;
+ } else if (!tmp_e && old_fm) {
+ ret = erase_block(ubi, old_fm->e[i]->pnum);
+ if (ret < 0) {
+ int j;
+
+ for (j = 1; j < i; j++)
+ ubi_wl_put_fm_peb(ubi, new_fm->e[j],
+ j, 0);
+
+ ubi_err("could not erase old fastmap PEB");
+ goto err;
+ }
+
+ new_fm->e[i]->pnum = old_fm->e[i]->pnum;
+ new_fm->e[i]->ec = old_fm->e[i]->ec;
+ } else {
+ new_fm->e[i]->pnum = tmp_e->pnum;
+ new_fm->e[i]->ec = tmp_e->ec;
+
+ if (old_fm)
+ ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
+ old_fm->to_be_tortured[i]);
+ }
+ }
+
+ spin_lock(&ubi->wl_lock);
+ tmp_e = ubi_wl_get_fm_peb(ubi, 1);
+ spin_unlock(&ubi->wl_lock);
+
+ if (old_fm) {
+ /* no fresh anchor PEB was found, reuse the old one */
+ if (!tmp_e) {
+ ret = erase_block(ubi, old_fm->e[0]->pnum);
+ if (ret < 0) {
+ int i;
+ ubi_err("could not erase old anchor PEB");
+
+ for (i = 1; i < new_fm->used_blocks; i++)
+ ubi_wl_put_fm_peb(ubi, new_fm->e[i],
+ i, 0);
+ goto err;
+ }
+
+ new_fm->e[0]->pnum = old_fm->e[0]->pnum;
+ new_fm->e[0]->ec = ret;
+ } else {
+ /* we've got a new anchor PEB, return the old one */
+ ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0,
+ old_fm->to_be_tortured[0]);
+
+ new_fm->e[0]->pnum = tmp_e->pnum;
+ new_fm->e[0]->ec = tmp_e->ec;
+ }
+ } else {
+ if (!tmp_e) {
+ int i;
+ ubi_err("could not find any anchor PEB");
+
+ for (i = 1; i < new_fm->used_blocks; i++)
+ ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0);
+
+ ret = -ENOSPC;
+ goto err;
+ }
+
+ new_fm->e[0]->pnum = tmp_e->pnum;
+ new_fm->e[0]->ec = tmp_e->ec;
+ }
+
+ down_write(&ubi->work_sem);
+ down_write(&ubi->fm_sem);
+ ret = ubi_write_fastmap(ubi, new_fm);
+ up_write(&ubi->fm_sem);
+ up_write(&ubi->work_sem);
+
+ if (ret)
+ goto err;
+
+out_unlock:
+ mutex_unlock(&ubi->fm_mutex);
+ kfree(old_fm);
+ return ret;
+
+err:
+ kfree(new_fm);
+
+ ubi_warn("Unable to write new fastmap, err=%i", ret);
+
+ ret = 0;
+ if (old_fm) {
+ ret = invalidate_fastmap(ubi, old_fm);
+ if (ret < 0)
+ ubi_err("Unable to invalidiate current fastmap!");
+ else if (ret)
+ ret = 0;
+ }
+ goto out_unlock;
+}
diff --git a/drivers/mtd/ubi/ubi-media.h b/drivers/mtd/ubi/ubi-media.h
index 468ffbc0eab..ac2b24d1783 100644
--- a/drivers/mtd/ubi/ubi-media.h
+++ b/drivers/mtd/ubi/ubi-media.h
@@ -375,4 +375,141 @@ struct ubi_vtbl_record {
__be32 crc;
} __packed;
+/* UBI fastmap on-flash data structures */
+
+#define UBI_FM_SB_VOLUME_ID (UBI_LAYOUT_VOLUME_ID + 1)
+#define UBI_FM_DATA_VOLUME_ID (UBI_LAYOUT_VOLUME_ID + 2)
+
+/* fastmap on-flash data structure format version */
+#define UBI_FM_FMT_VERSION 1
+
+#define UBI_FM_SB_MAGIC 0x7B11D69F
+#define UBI_FM_HDR_MAGIC 0xD4B82EF7
+#define UBI_FM_VHDR_MAGIC 0xFA370ED1
+#define UBI_FM_POOL_MAGIC 0x67AF4D08
+#define UBI_FM_EBA_MAGIC 0xf0c040a8
+
+/* A fastmap supber block can be located between PEB 0 and
+ * UBI_FM_MAX_START */
+#define UBI_FM_MAX_START 64
+
+/* A fastmap can use up to UBI_FM_MAX_BLOCKS PEBs */
+#define UBI_FM_MAX_BLOCKS 32
+
+/* 5% of the total number of PEBs have to be scanned while attaching
+ * from a fastmap.
+ * But the size of this pool is limited to be between UBI_FM_MIN_POOL_SIZE and
+ * UBI_FM_MAX_POOL_SIZE */
+#define UBI_FM_MIN_POOL_SIZE 8
+#define UBI_FM_MAX_POOL_SIZE 256
+
+#define UBI_FM_WL_POOL_SIZE 25
+
+/**
+ * struct ubi_fm_sb - UBI fastmap super block
+ * @magic: fastmap super block magic number (%UBI_FM_SB_MAGIC)
+ * @version: format version of this fastmap
+ * @data_crc: CRC over the fastmap data
+ * @used_blocks: number of PEBs used by this fastmap
+ * @block_loc: an array containing the location of all PEBs of the fastmap
+ * @block_ec: the erase counter of each used PEB
+ * @sqnum: highest sequence number value at the time while taking the fastmap
+ *
+ */
+struct ubi_fm_sb {
+ __be32 magic;
+ __u8 version;
+ __u8 padding1[3];
+ __be32 data_crc;
+ __be32 used_blocks;
+ __be32 block_loc[UBI_FM_MAX_BLOCKS];
+ __be32 block_ec[UBI_FM_MAX_BLOCKS];
+ __be64 sqnum;
+ __u8 padding2[32];
+} __packed;
+
+/**
+ * struct ubi_fm_hdr - header of the fastmap data set
+ * @magic: fastmap header magic number (%UBI_FM_HDR_MAGIC)
+ * @free_peb_count: number of free PEBs known by this fastmap
+ * @used_peb_count: number of used PEBs known by this fastmap
+ * @scrub_peb_count: number of to be scrubbed PEBs known by this fastmap
+ * @bad_peb_count: number of bad PEBs known by this fastmap
+ * @erase_peb_count: number of bad PEBs which have to be erased
+ * @vol_count: number of UBI volumes known by this fastmap
+ */
+struct ubi_fm_hdr {
+ __be32 magic;
+ __be32 free_peb_count;
+ __be32 used_peb_count;
+ __be32 scrub_peb_count;
+ __be32 bad_peb_count;
+ __be32 erase_peb_count;
+ __be32 vol_count;
+ __u8 padding[4];
+} __packed;
+
+/* struct ubi_fm_hdr is followed by two struct ubi_fm_scan_pool */
+
+/**
+ * struct ubi_fm_scan_pool - Fastmap pool PEBs to be scanned while attaching
+ * @magic: pool magic numer (%UBI_FM_POOL_MAGIC)
+ * @size: current pool size
+ * @max_size: maximal pool size
+ * @pebs: an array containing the location of all PEBs in this pool
+ */
+struct ubi_fm_scan_pool {
+ __be32 magic;
+ __be16 size;
+ __be16 max_size;
+ __be32 pebs[UBI_FM_MAX_POOL_SIZE];
+ __be32 padding[4];
+} __packed;
+
+/* ubi_fm_scan_pool is followed by nfree+nused struct ubi_fm_ec records */
+
+/**
+ * struct ubi_fm_ec - stores the erase counter of a PEB
+ * @pnum: PEB number
+ * @ec: ec of this PEB
+ */
+struct ubi_fm_ec {
+ __be32 pnum;
+ __be32 ec;
+} __packed;
+
+/**
+ * struct ubi_fm_volhdr - Fastmap volume header
+ * it identifies the start of an eba table
+ * @magic: Fastmap volume header magic number (%UBI_FM_VHDR_MAGIC)
+ * @vol_id: volume id of the fastmapped volume
+ * @vol_type: type of the fastmapped volume
+ * @data_pad: data_pad value of the fastmapped volume
+ * @used_ebs: number of used LEBs within this volume
+ * @last_eb_bytes: number of bytes used in the last LEB
+ */
+struct ubi_fm_volhdr {
+ __be32 magic;
+ __be32 vol_id;
+ __u8 vol_type;
+ __u8 padding1[3];
+ __be32 data_pad;
+ __be32 used_ebs;
+ __be32 last_eb_bytes;
+ __u8 padding2[8];
+} __packed;
+
+/* struct ubi_fm_volhdr is followed by one struct ubi_fm_eba records */
+
+/**
+ * struct ubi_fm_eba - denotes an association beween a PEB and LEB
+ * @magic: EBA table magic number
+ * @reserved_pebs: number of table entries
+ * @pnum: PEB number of LEB (LEB is the index)
+ */
+struct ubi_fm_eba {
+ __be32 magic;
+ __be32 reserved_pebs;
+ __be32 pnum[0];
+} __packed;
#endif /* !__UBI_MEDIA_H__ */
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 383ee43d242..7d57469723c 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -133,6 +133,17 @@ enum {
MOVE_RETRY,
};
+/*
+ * Return codes of the fastmap sub-system
+ *
+ * UBI_NO_FASTMAP: No fastmap super block was found
+ * UBI_BAD_FASTMAP: A fastmap was found but it's unusable
+ */
+enum {
+ UBI_NO_FASTMAP = 1,
+ UBI_BAD_FASTMAP,
+};
+
/**
* struct ubi_wl_entry - wear-leveling entry.
* @u.rb: link in the corresponding (free/used) RB-tree
@@ -199,6 +210,41 @@ struct ubi_rename_entry {
struct ubi_volume_desc;
/**
+ * struct ubi_fastmap_layout - in-memory fastmap data structure.
+ * @e: PEBs used by the current fastmap
+ * @to_be_tortured: if non-zero tortured this PEB
+ * @used_blocks: number of used PEBs
+ * @max_pool_size: maximal size of the user pool
+ * @max_wl_pool_size: maximal size of the pool used by the WL sub-system
+ */
+struct ubi_fastmap_layout {
+ struct ubi_wl_entry *e[UBI_FM_MAX_BLOCKS];
+ int to_be_tortured[UBI_FM_MAX_BLOCKS];
+ int used_blocks;
+ int max_pool_size;
+ int max_wl_pool_size;
+};
+
+/**
+ * struct ubi_fm_pool - in-memory fastmap pool
+ * @pebs: PEBs in this pool
+ * @used: number of used PEBs
+ * @size: total number of PEBs in this pool
+ * @max_size: maximal size of the pool
+ *
+ * A pool gets filled with up to max_size.
+ * If all PEBs within the pool are used a new fastmap will be written
+ * to the flash and the pool gets refilled with empty PEBs.
+ *
+ */
+struct ubi_fm_pool {
+ int pebs[UBI_FM_MAX_POOL_SIZE];
+ int used;
+ int size;
+ int max_size;
+};
+
+/**
* struct ubi_volume - UBI volume description data structure.
* @dev: device object to make use of the the Linux device model
* @cdev: character device object to create character device
@@ -333,9 +379,21 @@ struct ubi_wl_entry;
* @ltree: the lock tree
* @alc_mutex: serializes "atomic LEB change" operations
*
+ * @fm_disabled: non-zero if fastmap is disabled (default)
+ * @fm: in-memory data structure of the currently used fastmap
+ * @fm_pool: in-memory data structure of the fastmap pool
+ * @fm_wl_pool: in-memory data structure of the fastmap pool used by the WL
+ * sub-system
+ * @fm_mutex: serializes ubi_update_fastmap() and protects @fm_buf
+ * @fm_buf: vmalloc()'d buffer which holds the raw fastmap
+ * @fm_size: fastmap size in bytes
+ * @fm_sem: allows ubi_update_fastmap() to block EBA table changes
+ * @fm_work: fastmap work queue
+ *
* @used: RB-tree of used physical eraseblocks
* @erroneous: RB-tree of erroneous used physical eraseblocks
* @free: RB-tree of free physical eraseblocks
+ * @free_count: Contains the number of elements in @free
* @scrub: RB-tree of physical eraseblocks which need scrubbing
* @pq: protection queue (contain physical eraseblocks which are temporarily
* protected from the wear-leveling worker)
@@ -426,10 +484,22 @@ struct ubi_device {
struct rb_root ltree;
struct mutex alc_mutex;
+ /* Fastmap stuff */
+ int fm_disabled;
+ struct ubi_fastmap_layout *fm;
+ struct ubi_fm_pool fm_pool;
+ struct ubi_fm_pool fm_wl_pool;
+ struct rw_semaphore fm_sem;
+ struct mutex fm_mutex;
+ void *fm_buf;
+ size_t fm_size;
+ struct work_struct fm_work;
+
/* Wear-leveling sub-system's stuff */
struct rb_root used;
struct rb_root erroneous;
struct rb_root free;
+ int free_count;
struct rb_root scrub;
struct list_head pq[UBI_PROT_QUEUE_LEN];
int pq_head;
@@ -596,6 +666,32 @@ struct ubi_attach_info {
struct kmem_cache *aeb_slab_cache;
};
+/**
+ * struct ubi_work - UBI work description data structure.
+ * @list: a link in the list of pending works
+ * @func: worker function
+ * @e: physical eraseblock to erase
+ * @vol_id: the volume ID on which this erasure is being performed
+ * @lnum: the logical eraseblock number
+ * @torture: if the physical eraseblock has to be tortured
+ * @anchor: produce a anchor PEB to by used by fastmap
+ *
+ * The @func pointer points to the worker function. If the @cancel argument is
+ * not zero, the worker has to free the resources and exit immediately. The
+ * worker has to return zero in case of success and a negative error code in
+ * case of failure.
+ */
+struct ubi_work {
+ struct list_head list;
+ int (*func)(struct ubi_device *ubi, struct ubi_work *wrk, int cancel);
+ /* The below fields are only relevant to erasure works */
+ struct ubi_wl_entry *e;
+ int vol_id;
+ int lnum;
+ int torture;
+ int anchor;
+};
+
#include "debug.h"
extern struct kmem_cache *ubi_wl_entry_slab;
@@ -606,7 +702,7 @@ extern struct class *ubi_class;
extern struct mutex ubi_devices_mutex;
extern struct blocking_notifier_head ubi_notifiers;
-/* scan.c */
+/* attach.c */
int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,
int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips);
struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai,
@@ -614,7 +710,7 @@ struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai,
void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av);
struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi,
struct ubi_attach_info *ai);
-int ubi_attach(struct ubi_device *ubi);
+int ubi_attach(struct ubi_device *ubi, int force_scan);
void ubi_destroy_ai(struct ubi_attach_info *ai);
/* vtbl.c */
@@ -664,6 +760,9 @@ int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
struct ubi_vid_hdr *vid_hdr);
int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai);
+unsigned long long ubi_next_sqnum(struct ubi_device *ubi);
+int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
+ struct ubi_attach_info *ai_scan);
/* wl.c */
int ubi_wl_get_peb(struct ubi_device *ubi);
@@ -674,6 +773,12 @@ int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum);
int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai);
void ubi_wl_close(struct ubi_device *ubi);
int ubi_thread(void *u);
+struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor);
+int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *used_e,
+ int lnum, int torture);
+int ubi_is_erase_work(struct ubi_work *wrk);
+void ubi_refill_pools(struct ubi_device *ubi);
+int ubi_ensure_anchor_pebs(struct ubi_device *ubi);
/* io.c */
int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset,
@@ -711,6 +816,15 @@ void ubi_free_internal_volumes(struct ubi_device *ubi);
void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di);
void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol,
struct ubi_volume_info *vi);
+/* scan.c */
+int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,
+ int pnum, const struct ubi_vid_hdr *vid_hdr);
+
+/* fastmap.c */
+size_t ubi_calc_fm_size(struct ubi_device *ubi);
+int ubi_update_fastmap(struct ubi_device *ubi);
+int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
+ int fm_anchor);
/*
* ubi_rb_for_each_entry - walk an RB-tree.
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 032fc57f109..da7b44998b4 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -135,36 +135,48 @@
*/
#define WL_MAX_FAILURES 32
-/**
- * struct ubi_work - UBI work description data structure.
- * @list: a link in the list of pending works
- * @func: worker function
- * @e: physical eraseblock to erase
- * @vol_id: the volume ID on which this erasure is being performed
- * @lnum: the logical eraseblock number
- * @torture: if the physical eraseblock has to be tortured
- *
- * The @func pointer points to the worker function. If the @cancel argument is
- * not zero, the worker has to free the resources and exit immediately. The
- * worker has to return zero in case of success and a negative error code in
- * case of failure.
- */
-struct ubi_work {
- struct list_head list;
- int (*func)(struct ubi_device *ubi, struct ubi_work *wrk, int cancel);
- /* The below fields are only relevant to erasure works */
- struct ubi_wl_entry *e;
- int vol_id;
- int lnum;
- int torture;
-};
-
static int self_check_ec(struct ubi_device *ubi, int pnum, int ec);
static int self_check_in_wl_tree(const struct ubi_device *ubi,
struct ubi_wl_entry *e, struct rb_root *root);
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);
+}
+
+/**
+ * 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
@@ -261,18 +273,16 @@ static int produce_free_peb(struct ubi_device *ubi)
{
int err;
- spin_lock(&ubi->wl_lock);
while (!ubi->free.rb_node) {
spin_unlock(&ubi->wl_lock);
dbg_wl("do one work synchronously");
err = do_work(ubi);
- if (err)
- return err;
spin_lock(&ubi->wl_lock);
+ if (err)
+ return err;
}
- spin_unlock(&ubi->wl_lock);
return 0;
}
@@ -339,16 +349,18 @@ static void prot_queue_add(struct ubi_device *ubi, struct ubi_wl_entry *e)
/**
* find_wl_entry - find wear-leveling entry closest to certain erase counter.
+ * @ubi: UBI device description object
* @root: the RB-tree where to look for
* @diff: maximum possible difference from the smallest erase counter
*
* This function looks for a wear leveling entry with erase counter closest to
* min + @diff, where min is the smallest erase counter.
*/
-static struct ubi_wl_entry *find_wl_entry(struct rb_root *root, int diff)
+static struct ubi_wl_entry *find_wl_entry(struct ubi_device *ubi,
+ struct rb_root *root, int diff)
{
struct rb_node *p;
- struct ubi_wl_entry *e;
+ struct ubi_wl_entry *e, *prev_e = NULL;
int max;
e = rb_entry(rb_first(root), struct ubi_wl_entry, u.rb);
@@ -363,35 +375,143 @@ static struct ubi_wl_entry *find_wl_entry(struct rb_root *root, int diff)
p = p->rb_left;
else {
p = p->rb_right;
+ prev_e = e;
e = e1;
}
}
+ /* If no fastmap has been written and this WL entry can be used
+ * as anchor PEB, hold it back and return the second best WL entry
+ * such that fastmap can use the anchor PEB later. */
+ if (prev_e && !ubi->fm_disabled &&
+ !ubi->fm && e->pnum < UBI_FM_MAX_START)
+ return prev_e;
+
return e;
}
/**
- * ubi_wl_get_peb - get a physical eraseblock.
+ * find_mean_wl_entry - find wear-leveling entry with medium erase counter.
+ * @ubi: UBI device description object
+ * @root: the RB-tree where to look for
+ *
+ * This function looks for a wear leveling entry with medium erase counter,
+ * but not greater or equivalent than the lowest erase counter plus
+ * %WL_FREE_MAX_DIFF/2.
+ */
+static struct ubi_wl_entry *find_mean_wl_entry(struct ubi_device *ubi,
+ struct rb_root *root)
+{
+ struct ubi_wl_entry *e, *first, *last;
+
+ first = rb_entry(rb_first(root), struct ubi_wl_entry, u.rb);
+ last = rb_entry(rb_last(root), struct ubi_wl_entry, u.rb);
+
+ if (last->ec - first->ec < WL_FREE_MAX_DIFF) {
+ e = rb_entry(root->rb_node, struct ubi_wl_entry, u.rb);
+
+#ifdef CONFIG_MTD_UBI_FASTMAP
+ /* If no fastmap has been written and this WL entry can be used
+ * as anchor PEB, hold it back and return the second best
+ * WL entry such that fastmap can use the anchor PEB later. */
+ if (e && !ubi->fm_disabled && !ubi->fm &&
+ e->pnum < UBI_FM_MAX_START)
+ e = rb_entry(rb_next(root->rb_node),
+ struct ubi_wl_entry, u.rb);
+#endif
+ } else
+ e = find_wl_entry(ubi, root, WL_FREE_MAX_DIFF/2);
+
+ 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_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. Might sleep.
*/
-int ubi_wl_get_peb(struct ubi_device *ubi)
+static int __wl_get_peb(struct ubi_device *ubi)
{
int err;
- struct ubi_wl_entry *e, *first, *last;
+ struct ubi_wl_entry *e;
retry:
- spin_lock(&ubi->wl_lock);
if (!ubi->free.rb_node) {
if (ubi->works_count == 0) {
- ubi_assert(list_empty(&ubi->works));
ubi_err("no free eraseblocks");
- spin_unlock(&ubi->wl_lock);
+ ubi_assert(list_empty(&ubi->works));
return -ENOSPC;
}
- spin_unlock(&ubi->wl_lock);
err = produce_free_peb(ubi);
if (err < 0)
@@ -399,13 +519,11 @@ retry:
goto retry;
}
- first = rb_entry(rb_first(&ubi->free), struct ubi_wl_entry, u.rb);
- last = rb_entry(rb_last(&ubi->free), struct ubi_wl_entry, u.rb);
-
- if (last->ec - first->ec < WL_FREE_MAX_DIFF)
- e = rb_entry(ubi->free.rb_node, struct ubi_wl_entry, u.rb);
- else
- e = find_wl_entry(&ubi->free, WL_FREE_MAX_DIFF/2);
+ e = find_mean_wl_entry(ubi, &ubi->free);
+ if (!e) {
+ ubi_err("no free eraseblocks");
+ return -ENOSPC;
+ }
self_check_in_wl_tree(ubi, e, &ubi->free);
@@ -414,10 +532,14 @@ retry:
* be protected from being moved for some time.
*/
rb_erase(&e->u.rb, &ubi->free);
+ ubi->free_count--;
dbg_wl("PEB %d EC %d", e->pnum, e->ec);
+#ifndef CONFIG_MTD_UBI_FASTMAP
+ /* We have to enqueue e only if fastmap is disabled,
+ * is fastmap enabled prot_queue_add() will be called by
+ * ubi_wl_get_peb() after removing e from the pool. */
prot_queue_add(ubi, e);
- spin_unlock(&ubi->wl_lock);
-
+#endif
err = ubi_self_check_all_ff(ubi, e->pnum, ubi->vid_hdr_aloffset,
ubi->peb_size - ubi->vid_hdr_aloffset);
if (err) {
@@ -428,6 +550,150 @@ retry:
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++;
+ }
+}
+
+/**
+ * refill_wl_pool - refills all the fastmap pool used by the
+ * WL sub-system.
+ * @ubi: UBI device description object
+ */
+static void refill_wl_pool(struct ubi_device *ubi)
+{
+ struct ubi_wl_entry *e;
+ struct ubi_fm_pool *pool = &ubi->fm_wl_pool;
+
+ return_unused_pool_pebs(ubi, pool);
+
+ for (pool->size = 0; pool->size < pool->max_size; pool->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--;
+
+ pool->pebs[pool->size] = e->pnum;
+ }
+ pool->used = 0;
+}
+
+/**
+ * refill_wl_user_pool - refills all the fastmap pool used by ubi_wl_get_peb.
+ * @ubi: UBI device description object
+ */
+static void refill_wl_user_pool(struct ubi_device *ubi)
+{
+ struct ubi_fm_pool *pool = &ubi->fm_pool;
+
+ return_unused_pool_pebs(ubi, pool);
+
+ for (pool->size = 0; pool->size < pool->max_size; pool->size++) {
+ if (!ubi->free.rb_node ||
+ (ubi->free_count - ubi->beb_rsvd_pebs < 1))
+ break;
+
+ pool->pebs[pool->size] = __wl_get_peb(ubi);
+ if (pool->pebs[pool->size] < 0)
+ break;
+ }
+ pool->used = 0;
+}
+
+/**
+ * ubi_refill_pools - refills all fastmap PEB pools.
+ * @ubi: UBI device description object
+ */
+void ubi_refill_pools(struct ubi_device *ubi)
+{
+ spin_lock(&ubi->wl_lock);
+ refill_wl_pool(ubi);
+ refill_wl_user_pool(ubi);
+ spin_unlock(&ubi->wl_lock);
+}
+
+/* ubi_wl_get_peb - works exaclty like __wl_get_peb but keeps track of
+ * the fastmap pool.
+ */
+int ubi_wl_get_peb(struct ubi_device *ubi)
+{
+ int ret;
+ struct ubi_fm_pool *pool = &ubi->fm_pool;
+ struct ubi_fm_pool *wl_pool = &ubi->fm_wl_pool;
+
+ if (!pool->size || !wl_pool->size || pool->used == pool->size ||
+ wl_pool->used == wl_pool->size)
+ ubi_update_fastmap(ubi);
+
+ /* we got not a single free PEB */
+ if (!pool->size)
+ ret = -ENOSPC;
+ else {
+ spin_lock(&ubi->wl_lock);
+ ret = pool->pebs[pool->used++];
+ prot_queue_add(ubi, ubi->lookuptbl[ret]);
+ spin_unlock(&ubi->wl_lock);
+ }
+
+ 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 || !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. */
+ 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)
+{
+ return find_wl_entry(ubi, &ubi->free, WL_FREE_MAX_DIFF);
+}
+
+int ubi_wl_get_peb(struct ubi_device *ubi)
+{
+ int peb;
+
+ spin_lock(&ubi->wl_lock);
+ peb = __wl_get_peb(ubi);
+ spin_unlock(&ubi->wl_lock);
+
+ return peb;
+}
+#endif
+
/**
* prot_queue_del - remove a physical eraseblock from the protection queue.
* @ubi: UBI device description object
@@ -558,14 +824,14 @@ repeat:
}
/**
- * schedule_ubi_work - schedule a work.
+ * __schedule_ubi_work - schedule a work.
* @ubi: UBI device description object
* @wrk: the work to schedule
*
* This function adds a work defined by @wrk to the tail of the pending works
- * list.
+ * list. Can only be used of ubi->work_sem is already held in read mode!
*/
-static void schedule_ubi_work(struct ubi_device *ubi, struct ubi_work *wrk)
+static void __schedule_ubi_work(struct ubi_device *ubi, struct ubi_work *wrk)
{
spin_lock(&ubi->wl_lock);
list_add_tail(&wrk->list, &ubi->works);
@@ -576,9 +842,35 @@ static void schedule_ubi_work(struct ubi_device *ubi, struct ubi_work *wrk)
spin_unlock(&ubi->wl_lock);
}
+/**
+ * schedule_ubi_work - schedule a work.
+ * @ubi: UBI device description object
+ * @wrk: the work to schedule
+ *
+ * This function adds a work defined by @wrk to the tail of the pending works
+ * list.
+ */
+static void schedule_ubi_work(struct ubi_device *ubi, struct ubi_work *wrk)
+{
+ down_read(&ubi->work_sem);
+ __schedule_ubi_work(ubi, wrk);
+ up_read(&ubi->work_sem);
+}
+
static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
int cancel);
+#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
@@ -595,6 +887,9 @@ 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));
+
dbg_wl("schedule erasure of PEB %d, EC %d, torture %d",
e->pnum, e->ec, torture);
@@ -613,6 +908,79 @@ static int schedule_erase(struct ubi_device *ubi, struct ubi_wl_entry *e,
}
/**
+ * do_sync_erase - run the erase worker synchronously.
+ * @ubi: UBI device description object
+ * @e: the WL entry of the physical eraseblock to erase
+ * @vol_id: the volume ID that last used this PEB
+ * @lnum: the last used logical eraseblock number for the PEB
+ * @torture: if the physical eraseblock has to be tortured
+ *
+ */
+static int do_sync_erase(struct ubi_device *ubi, struct ubi_wl_entry *e,
+ int vol_id, int lnum, int torture)
+{
+ struct ubi_work *wl_wrk;
+
+ dbg_wl("sync erase of PEB %i", e->pnum);
+
+ wl_wrk = kmalloc(sizeof(struct ubi_work), GFP_NOFS);
+ if (!wl_wrk)
+ return -ENOMEM;
+
+ wl_wrk->e = e;
+ wl_wrk->vol_id = vol_id;
+ wl_wrk->lnum = lnum;
+ wl_wrk->torture = torture;
+
+ 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;
+ } else {
+ e->ec = fm_e->ec;
+ kfree(fm_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
* @wrk: the work object
@@ -627,6 +995,9 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
{
int err, scrubbing = 0, torture = 0, protect = 0, erroneous = 0;
int vol_id = -1, uninitialized_var(lnum);
+#ifdef CONFIG_MTD_UBI_FASTMAP
+ int anchor = wrk->anchor;
+#endif
struct ubi_wl_entry *e1, *e2;
struct ubi_vid_hdr *vid_hdr;
@@ -660,14 +1031,35 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
goto out_cancel;
}
+#ifdef CONFIG_MTD_UBI_FASTMAP
+ /* Check whether we need to produce an anchor PEB */
+ if (!anchor)
+ anchor = !anchor_pebs_avalible(&ubi->free);
+
+ if (anchor) {
+ e1 = find_anchor_wl_entry(&ubi->used);
+ if (!e1)
+ goto out_cancel;
+ e2 = get_peb_for_wl(ubi);
+ if (!e2)
+ goto out_cancel;
+
+ self_check_in_wl_tree(ubi, e1, &ubi->used);
+ rb_erase(&e1->u.rb, &ubi->used);
+ dbg_wl("anchor-move PEB %d to PEB %d", e1->pnum, e2->pnum);
+ } else if (!ubi->scrub.rb_node) {
+#else
if (!ubi->scrub.rb_node) {
+#endif
/*
* Now pick the least worn-out used physical eraseblock and a
* highly worn-out free physical eraseblock. If the erase
* counters differ much enough, start wear-leveling.
*/
e1 = rb_entry(rb_first(&ubi->used), struct ubi_wl_entry, u.rb);
- e2 = find_wl_entry(&ubi->free, WL_FREE_MAX_DIFF);
+ e2 = get_peb_for_wl(ubi);
+ if (!e2)
+ goto out_cancel;
if (!(e2->ec - e1->ec >= UBI_WL_THRESHOLD)) {
dbg_wl("no WL needed: min used EC %d, max free EC %d",
@@ -682,14 +1074,15 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
/* Perform scrubbing */
scrubbing = 1;
e1 = rb_entry(rb_first(&ubi->scrub), struct ubi_wl_entry, u.rb);
- e2 = find_wl_entry(&ubi->free, WL_FREE_MAX_DIFF);
+ e2 = get_peb_for_wl(ubi);
+ if (!e2)
+ goto out_cancel;
+
self_check_in_wl_tree(ubi, e1, &ubi->scrub);
rb_erase(&e1->u.rb, &ubi->scrub);
dbg_wl("scrub PEB %d to PEB %d", e1->pnum, e2->pnum);
}
- self_check_in_wl_tree(ubi, e2, &ubi->free);
- rb_erase(&e2->u.rb, &ubi->free);
ubi->move_from = e1;
ubi->move_to = e2;
spin_unlock(&ubi->wl_lock);
@@ -806,7 +1199,7 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
ubi->move_to_put = ubi->wl_scheduled = 0;
spin_unlock(&ubi->wl_lock);
- err = schedule_erase(ubi, e1, vol_id, lnum, 0);
+ err = do_sync_erase(ubi, e1, vol_id, lnum, 0);
if (err) {
kmem_cache_free(ubi_wl_entry_slab, e1);
if (e2)
@@ -821,7 +1214,7 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
*/
dbg_wl("PEB %d (LEB %d:%d) was put meanwhile, erase",
e2->pnum, vol_id, lnum);
- err = schedule_erase(ubi, e2, vol_id, lnum, 0);
+ err = do_sync_erase(ubi, e2, vol_id, lnum, 0);
if (err) {
kmem_cache_free(ubi_wl_entry_slab, e2);
goto out_ro;
@@ -860,7 +1253,7 @@ out_not_moved:
spin_unlock(&ubi->wl_lock);
ubi_free_vid_hdr(ubi, vid_hdr);
- err = schedule_erase(ubi, e2, vol_id, lnum, torture);
+ err = do_sync_erase(ubi, e2, vol_id, lnum, torture);
if (err) {
kmem_cache_free(ubi_wl_entry_slab, e2);
goto out_ro;
@@ -901,12 +1294,13 @@ out_cancel:
/**
* ensure_wear_leveling - schedule wear-leveling if it is needed.
* @ubi: UBI device description object
+ * @nested: set to non-zero if this function is called from UBI worker
*
* This function checks if it is time to start wear-leveling and schedules it
* if yes. This function returns zero in case of success and a negative error
* code in case of failure.
*/
-static int ensure_wear_leveling(struct ubi_device *ubi)
+static int ensure_wear_leveling(struct ubi_device *ubi, int nested)
{
int err = 0;
struct ubi_wl_entry *e1;
@@ -934,7 +1328,7 @@ static int ensure_wear_leveling(struct ubi_device *ubi)
* %UBI_WL_THRESHOLD.
*/
e1 = rb_entry(rb_first(&ubi->used), struct ubi_wl_entry, u.rb);
- e2 = find_wl_entry(&ubi->free, WL_FREE_MAX_DIFF);
+ e2 = find_wl_entry(ubi, &ubi->free, WL_FREE_MAX_DIFF);
if (!(e2->ec - e1->ec >= UBI_WL_THRESHOLD))
goto out_unlock;
@@ -951,8 +1345,12 @@ static int ensure_wear_leveling(struct ubi_device *ubi)
goto out_cancel;
}
+ wrk->anchor = 0;
wrk->func = &wear_leveling_worker;
- schedule_ubi_work(ubi, wrk);
+ if (nested)
+ __schedule_ubi_work(ubi, wrk);
+ else
+ schedule_ubi_work(ubi, wrk);
return err;
out_cancel:
@@ -963,6 +1361,38 @@ 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
@@ -993,6 +1423,8 @@ 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));
+
err = sync_erase(ubi, e, wl_wrk->torture);
if (!err) {
/* Fine, we've erased it successfully */
@@ -1000,6 +1432,7 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
spin_lock(&ubi->wl_lock);
wl_tree_add(e, &ubi->free);
+ ubi->free_count++;
spin_unlock(&ubi->wl_lock);
/*
@@ -1009,7 +1442,7 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
serve_prot_queue(ubi);
/* And take care about wear-leveling */
- err = ensure_wear_leveling(ubi);
+ err = ensure_wear_leveling(ubi, 1);
return err;
}
@@ -1247,7 +1680,7 @@ retry:
* Technically scrubbing is the same as wear-leveling, so it is done
* by the WL worker.
*/
- return ensure_wear_leveling(ubi);
+ return ensure_wear_leveling(ubi, 0);
}
/**
@@ -1428,7 +1861,7 @@ static void cancel_pending(struct ubi_device *ubi)
*/
int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
{
- int err, i;
+ int err, i, reserved_pebs, found_pebs = 0;
struct rb_node *rb1, *rb2;
struct ubi_ainf_volume *av;
struct ubi_ainf_peb *aeb, *tmp;
@@ -1440,6 +1873,9 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
init_rwsem(&ubi->work_sem);
ubi->max_ec = ai->max_ec;
INIT_LIST_HEAD(&ubi->works);
+#ifdef CONFIG_MTD_UBI_FASTMAP
+ INIT_WORK(&ubi->fm_work, update_fastmap_work_fn);
+#endif
sprintf(ubi->bgt_name, UBI_BGT_NAME_PATTERN, ubi->ubi_num);
@@ -1461,13 +1897,17 @@ 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->lookuptbl[e->pnum] = e;
if (schedule_erase(ubi, e, aeb->vol_id, aeb->lnum, 0)) {
kmem_cache_free(ubi_wl_entry_slab, e);
goto out_free;
}
+
+ found_pebs++;
}
+ ubi->free_count = 0;
list_for_each_entry(aeb, &ai->free, u.list) {
cond_resched();
@@ -1478,8 +1918,14 @@ 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));
+
wl_tree_add(e, &ubi->free);
+ ubi->free_count++;
+
ubi->lookuptbl[e->pnum] = e;
+
+ found_pebs++;
}
ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) {
@@ -1493,6 +1939,7 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
e->pnum = aeb->pnum;
e->ec = aeb->ec;
ubi->lookuptbl[e->pnum] = e;
+
if (!aeb->scrub) {
dbg_wl("add PEB %d EC %d to the used tree",
e->pnum, e->ec);
@@ -1502,22 +1949,38 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
e->pnum, e->ec);
wl_tree_add(e, &ubi->scrub);
}
+
+ found_pebs++;
}
}
- if (ubi->avail_pebs < WL_RESERVED_PEBS) {
+ dbg_wl("found %i PEBs", found_pebs);
+
+ if (ubi->fm)
+ ubi_assert(ubi->good_peb_count == \
+ found_pebs + ubi->fm->used_blocks);
+ else
+ ubi_assert(ubi->good_peb_count == found_pebs);
+
+ reserved_pebs = WL_RESERVED_PEBS;
+#ifdef CONFIG_MTD_UBI_FASTMAP
+ /* Reserve enough LEBs to store two fastmaps. */
+ reserved_pebs += (ubi->fm_size / ubi->leb_size) * 2;
+#endif
+
+ if (ubi->avail_pebs < reserved_pebs) {
ubi_err("no enough physical eraseblocks (%d, need %d)",
- ubi->avail_pebs, WL_RESERVED_PEBS);
+ ubi->avail_pebs, reserved_pebs);
if (ubi->corr_peb_count)
ubi_err("%d PEBs are corrupted and not used",
ubi->corr_peb_count);
goto out_free;
}
- ubi->avail_pebs -= WL_RESERVED_PEBS;
- ubi->rsvd_pebs += WL_RESERVED_PEBS;
+ ubi->avail_pebs -= reserved_pebs;
+ ubi->rsvd_pebs += reserved_pebs;
/* Schedule wear-leveling if needed */
- err = ensure_wear_leveling(ubi);
+ err = ensure_wear_leveling(ubi, 0);
if (err)
goto out_free;
@@ -1596,7 +2059,7 @@ static int self_check_ec(struct ubi_device *ubi, int pnum, int ec)
}
read_ec = be64_to_cpu(ec_hdr->ec);
- if (ec != read_ec) {
+ if (ec != read_ec && read_ec - ec > 1) {
ubi_err("self-check failed for PEB %d", pnum);
ubi_err("read EC is %lld, should be %d", read_ec, ec);
dump_stack();