diff options
Diffstat (limited to 'drivers/mtd/ubi/misc.c')
| -rw-r--r-- | drivers/mtd/ubi/misc.c | 39 |
1 files changed, 34 insertions, 5 deletions
diff --git a/drivers/mtd/ubi/misc.c b/drivers/mtd/ubi/misc.c index ff2a65c37f69..554867dfd18b 100644 --- a/drivers/mtd/ubi/misc.c +++ b/drivers/mtd/ubi/misc.c @@ -92,16 +92,45 @@ int ubi_check_volume(struct ubi_device *ubi, int vol_id) } /** - * ubi_calculate_rsvd_pool - calculate how many PEBs must be reserved for bad + * ubi_update_reserved - update bad eraseblock handling accounting data. + * @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 = min_t(int, 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 */ void ubi_calculate_reserved(struct ubi_device *ubi) { - ubi->beb_rsvd_level = ubi->good_peb_count/100; - ubi->beb_rsvd_level *= CONFIG_MTD_UBI_BEB_RESERVE; - if (ubi->beb_rsvd_level < MIN_RESEVED_PEBS) - ubi->beb_rsvd_level = MIN_RESEVED_PEBS; + /* + * Calculate the actual number of PEBs currently needed to be reserved + * for future bad eraseblock handling. + */ + ubi->beb_rsvd_level = ubi->bad_peb_limit - ubi->bad_peb_count; + if (ubi->beb_rsvd_level < 0) { + ubi->beb_rsvd_level = 0; + ubi_warn("number of bad PEBs (%d) is above the expected limit (%d), not reserving any PEBs for bad PEB handling, will use available PEBs (if any)", + ubi->bad_peb_count, ubi->bad_peb_limit); + } } /** |