[PATCH 5/5] ubi: harmonize the update of ubi->beb_rsvd_pebs

Shmulik Ladkani
2012-07-04T08:08:59Z

Currently, there are several locations where an attempt to reserve more
PEBs for bad PEB handling is made, with the same code being duplicated.

Harmonize it by introducing 'ubi_update_reserved()'.

Also, improve the debug message issued, making it more descriptive.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
---
drivers/mtd/ubi/misc.c | 26 ++++++++++++++++++++++++++
drivers/mtd/ubi/ubi.h | 1 +
drivers/mtd/ubi/vmt.c | 20 ++------------------
3 files changed, 29 insertions(+), 18 deletions(-)

diff --git a/drivers/mtd/ubi/misc.c b/drivers/mtd/ubi/misc.c
index 25b564f..b7d26ed 100644
--- a/drivers/mtd/ubi/misc.c
+++ b/drivers/mtd/ubi/misc.c
@@ -92,6 +92,32 @@ int ubi_check_volume(struct ubi_device *ubi, int vol_id)
}

/**
+ * ubi_update_reserved - update the number of PEBs reserved for bad
+ * eraseblock handling.
+ * @ubi: UBI device description object
+ *
+ * This function calculates the gap between current number of
+ * PEBs reserved for bad eraseblock handling and the required level of PEBs
+ * that must be reserved, and if necessary, reserves more PEBs to fill that
+ * gap, according to availability.
+ *
+ * Should be called with ubi->volumes_lock held.
+ */
+void ubi_update_reserved(struct ubi_device *ubi)
+{
+ int need = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
+
+ if (need <= 0 || ubi->avail_pebs == 0)
+ return;
+
+ need = ubi->avail_pebs >= need ? need : ubi->avail_pebs;
+ ubi->avail_pebs -= need;
+ ubi->rsvd_pebs += need;
+ ubi->beb_rsvd_pebs += need;
+ ubi_msg("reserved more %d PEBs for bad PEB handling", need);
+}
+
+/**
* ubi_calculate_reserved - calculate how many PEBs must be reserved for bad
* eraseblock handling.
* @ubi: UBI device description object
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 80c394eb..c94612e 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -646,6 +646,7 @@ int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol,
int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf,
int length);
int ubi_check_volume(struct ubi_device *ubi, int vol_id);
+void ubi_update_reserved(struct ubi_device *ubi);
void ubi_calculate_reserved(struct ubi_device *ubi);
int ubi_check_pattern(const void *buf, uint8_t patt, int size);

diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c
index 0669cff..9169e58 100644
--- a/drivers/mtd/ubi/vmt.c
+++ b/drivers/mtd/ubi/vmt.c
@@ -443,15 +443,7 @@ int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
spin_lock(&ubi->volumes_lock);
ubi->rsvd_pebs -= reserved_pebs;
ubi->avail_pebs += reserved_pebs;
- i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
- if (i > 0) {
- i = ubi->avail_pebs >= i ? i : ubi->avail_pebs;
- ubi->avail_pebs -= i;
- ubi->rsvd_pebs += i;
- ubi->beb_rsvd_pebs += i;
- if (i > 0)
- ubi_msg("reserve more %d PEBs", i);
- }
+ ubi_update_reserved(ubi);
ubi->vol_count -= 1;
spin_unlock(&ubi->volumes_lock);

@@ -558,15 +550,7 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
spin_lock(&ubi->volumes_lock);
ubi->rsvd_pebs += pebs;
ubi->avail_pebs -= pebs;
- pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
- if (pebs > 0) {
- pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs;
- ubi->avail_pebs -= pebs;
- ubi->rsvd_pebs += pebs;
- ubi->beb_rsvd_pebs += pebs;
- if (pebs > 0)
- ubi_msg("reserve more %d PEBs", pebs);
- }
+ ubi_update_reserved(ubi);
for (i = 0; i < reserved_pebs; i++)
new_mapping[i] = vol->eba_tbl[i];
kfree(vol->eba_tbl);
--
1.7.9