diff options
| -rw-r--r-- | drivers/mtd/ubi/cdev.c | 8 | ||||
| -rw-r--r-- | drivers/mtd/ubi/kapi.c | 15 | ||||
| -rw-r--r-- | drivers/mtd/ubi/ubi.h | 8 | ||||
| -rw-r--r-- | include/linux/mtd/ubi.h | 5 |
4 files changed, 28 insertions, 8 deletions
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c index 3410ea8109f8..f5c715c32dcd 100644 --- a/drivers/mtd/ubi/cdev.c +++ b/drivers/mtd/ubi/cdev.c @@ -61,13 +61,13 @@ static int get_exclusive(struct ubi_device *ubi, struct ubi_volume_desc *desc) struct ubi_volume *vol = desc->vol; spin_lock(&vol->ubi->volumes_lock); - users = vol->readers + vol->writers + vol->exclusive; + users = vol->readers + vol->writers + vol->exclusive + vol->metaonly; ubi_assert(users > 0); if (users > 1) { ubi_err(ubi, "%d users for volume %d", users, vol->vol_id); err = -EBUSY; } else { - vol->readers = vol->writers = 0; + vol->readers = vol->writers = vol->metaonly = 0; vol->exclusive = 1; err = desc->mode; desc->mode = UBI_EXCLUSIVE; @@ -87,13 +87,15 @@ static void revoke_exclusive(struct ubi_volume_desc *desc, int mode) struct ubi_volume *vol = desc->vol; spin_lock(&vol->ubi->volumes_lock); - ubi_assert(vol->readers == 0 && vol->writers == 0); + ubi_assert(vol->readers == 0 && vol->writers == 0 && vol->metaonly == 0); ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); vol->exclusive = 0; if (mode == UBI_READONLY) vol->readers = 1; else if (mode == UBI_READWRITE) vol->writers = 1; + else if (mode == UBI_METAONLY) + vol->metaonly = 1; else vol->exclusive = 1; spin_unlock(&vol->ubi->volumes_lock); diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c index f3bab669f6bb..589c423fac2d 100644 --- a/drivers/mtd/ubi/kapi.c +++ b/drivers/mtd/ubi/kapi.c @@ -137,7 +137,7 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode) return ERR_PTR(-EINVAL); if (mode != UBI_READONLY && mode != UBI_READWRITE && - mode != UBI_EXCLUSIVE) + mode != UBI_EXCLUSIVE && mode != UBI_METAONLY) return ERR_PTR(-EINVAL); /* @@ -182,10 +182,17 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode) break; case UBI_EXCLUSIVE: - if (vol->exclusive || vol->writers || vol->readers) + if (vol->exclusive || vol->writers || vol->readers || + vol->metaonly) goto out_unlock; vol->exclusive = 1; break; + + case UBI_METAONLY: + if (vol->metaonly || vol->exclusive) + goto out_unlock; + vol->metaonly = 1; + break; } get_device(&vol->dev); vol->ref_count += 1; @@ -343,6 +350,10 @@ void ubi_close_volume(struct ubi_volume_desc *desc) break; case UBI_EXCLUSIVE: vol->exclusive = 0; + break; + case UBI_METAONLY: + vol->metaonly = 0; + break; } vol->ref_count -= 1; spin_unlock(&ubi->volumes_lock); diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h index f80ffaba9058..20cabc060b61 100644 --- a/drivers/mtd/ubi/ubi.h +++ b/drivers/mtd/ubi/ubi.h @@ -261,6 +261,7 @@ struct ubi_fm_pool { * @readers: number of users holding this volume in read-only mode * @writers: number of users holding this volume in read-write mode * @exclusive: whether somebody holds this volume in exclusive mode + * @metaonly: whether somebody is altering only meta data of this volume * * @reserved_pebs: how many physical eraseblocks are reserved for this volume * @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME) @@ -309,6 +310,7 @@ struct ubi_volume { int readers; int writers; int exclusive; + int metaonly; int reserved_pebs; int vol_type; @@ -339,7 +341,8 @@ struct ubi_volume { /** * struct ubi_volume_desc - UBI volume descriptor returned when it is opened. * @vol: reference to the corresponding volume description object - * @mode: open mode (%UBI_READONLY, %UBI_READWRITE, or %UBI_EXCLUSIVE) + * @mode: open mode (%UBI_READONLY, %UBI_READWRITE, %UBI_EXCLUSIVE + * or %UBI_METAONLY) */ struct ubi_volume_desc { struct ubi_volume *vol; @@ -390,7 +393,8 @@ struct ubi_debug_info { * @volumes_lock: protects @volumes, @rsvd_pebs, @avail_pebs, beb_rsvd_pebs, * @beb_rsvd_level, @bad_peb_count, @good_peb_count, @vol_count, * @vol->readers, @vol->writers, @vol->exclusive, - * @vol->ref_count, @vol->mapping and @vol->eba_tbl. + * @vol->metaonly, @vol->ref_count, @vol->mapping and + * @vol->eba_tbl. * @ref_count: count of references on the UBI device * @image_seq: image sequence number recorded on EC headers * diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h index c3918a0684fe..8fa2753316e8 100644 --- a/include/linux/mtd/ubi.h +++ b/include/linux/mtd/ubi.h @@ -34,11 +34,14 @@ * UBI_READONLY: read-only mode * UBI_READWRITE: read-write mode * UBI_EXCLUSIVE: exclusive mode + * UBI_METAONLY: modify only the volume meta-data, + * i.e. the data stored in the volume table, but not in any of volume LEBs. */ enum { UBI_READONLY = 1, UBI_READWRITE, - UBI_EXCLUSIVE + UBI_EXCLUSIVE, + UBI_METAONLY }; /** |