int i, err;
dev_t dev;
- mutex_init(&ubi->volumes_mutex);
- spin_lock_init(&ubi->volumes_lock);
-
sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num);
/*
return 0;
}
+/**
+ * autoresize - re-size the volume which has the "auto-resize" flag set.
+ * @ubi: UBI device description object
+ * @vol_id: ID of the volume to re-size
+ *
+ * This function re-sizes the volume marked by the @UBI_VTBL_AUTORESIZE_FLG in
+ * the volume table to the largest possible size. See comments in ubi-header.h
+ * for more description of the flag. Returns zero in case of success and a
+ * negative error code in case of failure.
+ */
+static int autoresize(struct ubi_device *ubi, int vol_id)
+{
+ struct ubi_volume_desc desc;
+ struct ubi_volume *vol = ubi->volumes[vol_id];
+ int err, old_reserved_pebs = vol->reserved_pebs;
+
+ /*
+ * Clear the auto-resize flag in the volume in-memory copy of the
+ * volume table, and 'ubi_resize_volume()' will propogate this change
+ * to the flash.
+ */
+ ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG;
+
+ if (ubi->avail_pebs == 0) {
+ struct ubi_vtbl_record vtbl_rec;
+
+ /*
+ * No avalilable PEBs to re-size the volume, clear the flag on
+ * flash and exit.
+ */
+ memcpy(&vtbl_rec, &ubi->vtbl[vol_id],
+ sizeof(struct ubi_vtbl_record));
+ err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
+ if (err)
+ ubi_err("cannot clean auto-resize flag for volume %d",
+ vol_id);
+ } else {
+ desc.vol = vol;
+ err = ubi_resize_volume(&desc,
+ old_reserved_pebs + ubi->avail_pebs);
+ if (err)
+ ubi_err("cannot auto-resize volume %d", vol_id);
+ }
+
+ if (err)
+ return err;
+
+ ubi_msg("volume %d (\"%s\") re-sized from %d to %d LEBs", vol_id,
+ vol->name, old_reserved_pebs, vol->reserved_pebs);
+ return 0;
+}
+
/**
* ubi_attach_mtd_dev - attach an MTD device.
* @mtd_dev: MTD device description object
ubi->mtd = mtd;
ubi->ubi_num = ubi_num;
ubi->vid_hdr_offset = vid_hdr_offset;
+ ubi->autoresize_vol_id = -1;
+
+ mutex_init(&ubi->buf_mutex);
+ mutex_init(&ubi->ckvol_mutex);
+ mutex_init(&ubi->volumes_mutex);
+ spin_lock_init(&ubi->volumes_lock);
dbg_msg("attaching mtd%d to ubi%d: VID header offset %d",
mtd->index, ubi_num, vid_hdr_offset);
if (err)
goto out_free;
- mutex_init(&ubi->buf_mutex);
- mutex_init(&ubi->ckvol_mutex);
ubi->peb_buf1 = vmalloc(ubi->peb_size);
if (!ubi->peb_buf1)
goto out_free;
goto out_free;
}
+ if (ubi->autoresize_vol_id != -1) {
+ err = autoresize(ubi, ubi->autoresize_vol_id);
+ if (err)
+ goto out_detach;
+ }
+
err = uif_init(ubi);
if (err)
goto out_detach;
{
int err, pnum, vol_id = vol->vol_id;
- ubi_assert(ubi->ref_count > 0);
- ubi_assert(vol->ref_count > 0);
-
if (ubi->ro_mode)
return -EROFS;
struct ubi_vid_hdr *vid_hdr;
uint32_t uninitialized_var(crc);
- ubi_assert(ubi->ref_count > 0);
- ubi_assert(vol->ref_count > 0);
-
err = leb_read_lock(ubi, vol_id, lnum);
if (err)
return err;
int err, pnum, tries = 0, vol_id = vol->vol_id;
struct ubi_vid_hdr *vid_hdr;
- ubi_assert(ubi->ref_count > 0);
- ubi_assert(vol->ref_count > 0);
-
if (ubi->ro_mode)
return -EROFS;
struct ubi_vid_hdr *vid_hdr;
uint32_t crc;
- ubi_assert(ubi->ref_count > 0);
- ubi_assert(vol->ref_count > 0);
-
if (ubi->ro_mode)
return -EROFS;
struct ubi_vid_hdr *vid_hdr;
uint32_t crc;
- ubi_assert(ubi->ref_count > 0);
- ubi_assert(vol->ref_count > 0);
-
if (ubi->ro_mode)
return -EROFS;
* @rsvd_pebs: count of reserved physical eraseblocks
* @avail_pebs: count of available physical eraseblocks
* @beb_rsvd_pebs: how many physical eraseblocks are reserved for bad PEB
- * handling
+ * handling
* @beb_rsvd_level: normal level of PEBs reserved for bad PEB handling
*
+ * @autoresize_vol_id: ID of the volume which has to be auto-resized at the end
+ * of UBI ititializetion
* @vtbl_slots: how many slots are available in the volume table
* @vtbl_size: size of the volume table in bytes
* @vtbl: in-RAM volume table copy
int beb_rsvd_pebs;
int beb_rsvd_level;
+ int autoresize_vol_id;
int vtbl_slots;
int vtbl_size;
struct ubi_vtbl_record *vtbl;
struct mutex volumes_mutex;
int max_ec;
+ /* TODO: mean_ec is not updated run-time, fix */
int mean_ec;
/* EBA unit's stuff */
dbg_msg("re-size volume %d to from %d to %d PEBs",
vol_id, vol->reserved_pebs, reserved_pebs);
- ubi_assert(desc->mode == UBI_EXCLUSIVE);
- ubi_assert(vol == ubi->volumes[vol_id]);
if (vol->vol_type == UBI_STATIC_VOLUME &&
reserved_pebs < vol->used_ebs) {
vol->name[vol->name_len] = '\0';
vol->vol_id = i;
+ if (vtbl[i].flags & UBI_VTBL_AUTORESIZE_FLG) {
+ /* Auto re-size flag may be set only for one volume */
+ if (ubi->autoresize_vol_id != -1) {
+ ubi_err("more then one auto-resize volume (%d "
+ "and %d)", ubi->autoresize_vol_id, i);
+ return -EINVAL;
+ }
+
+ ubi->autoresize_vol_id = i;
+ }
+
ubi_assert(!ubi->volumes[i]);
ubi->volumes[i] = vol;
ubi->vol_count += 1;
* Make sure all the works which have been done in parallel are
* finished.
*/
- ubi_assert(ubi->ref_count > 0);
down_write(&ubi->work_sem);
up_write(&ubi->work_sem);
UBI_VID_STATIC = 2
};
+/*
+ * Volume flags used in the volume table record.
+ *
+ * @UBI_VTBL_AUTORESIZE_FLG: auto-resize this volume
+ *
+ * %UBI_VTBL_AUTORESIZE_FLG flag can be set only for one volume in the volume
+ * table. UBI automatically re-sizes the volume which has this flag and makes
+ * the volume to be of largest possible size. This means that if after the
+ * initialization UBI finds out that there are available physical eraseblocks
+ * present on the device, it automatically appends all of them to the volume
+ * (the physical eraseblocks reserved for bad eraseblocks handling and other
+ * reserved physical eraseblocks are not taken). So, if there is a volume with
+ * the %UBI_VTBL_AUTORESIZE_FLG flag set, the amount of available logical
+ * eraseblocks will be zero after UBI is loaded, because all of them will be
+ * reserved for this volume. Note, the %UBI_VTBL_AUTORESIZE_FLG bit is cleared
+ * after the volume had been initialized.
+ *
+ * The auto-resize feature is useful for device production purposes. For
+ * example, different NAND flash chips may have different amount of initial bad
+ * eraseblocks, depending of particular chip instance. Manufacturers of NAND
+ * chips usually guarantee that the amount of initial bad eraseblocks does not
+ * exceed certain percent, e.g. 2%. When one creates an UBI image which will be
+ * flashed to the end devices in production, he does not know the exact amount
+ * of good physical eraseblocks the NAND chip on the device will have, but this
+ * number is required to calculate the volume sized and put them to the volume
+ * table of the UBI image. In this case, one of the volumes (e.g., the one
+ * which will store the root file system) is marked as "auto-resizable", and
+ * UBI will adjust its size on the first boot if needed.
+ *
+ * Note, first UBI reserves some amount of physical eraseblocks for bad
+ * eraseblock handling, and then re-sizes the volume, not vice-versa. This
+ * means that the pool of reserved physical eraseblocks will always be present.
+ */
+enum {
+ UBI_VTBL_AUTORESIZE_FLG = 0x01,
+};
+
/*
* Compatibility constants used by internal volumes.
*
* @upd_marker: if volume update was started but not finished
* @name_len: volume name length
* @name: the volume name
- * @padding2: reserved, zeroes
+ * @flags: volume flags (%UBI_VTBL_AUTORESIZE_FLG)
+ * @padding: reserved, zeroes
* @crc: a CRC32 checksum of the record
*
* The volume table records are stored in the volume table, which is stored in
__u8 upd_marker;
__be16 name_len;
__u8 name[UBI_VOL_NAME_MAX+1];
- __u8 padding2[24];
+ __u8 flags;
+ __u8 padding[23];
__be32 crc;
} __attribute__ ((packed));
projects / linux-2.6-omap-h63xx.git / commitdiff