---

yaml
---
r: 84286
b: refs/heads/master
c: 4ccf8cf
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 896c0c06aa30147630e9a75949b6ae2014c841fc
+refs/heads/master: 4ccf8cffa963c7b5bdc6d455ea9417084ee49aa8

trunk/drivers/mtd/ubi/build.c

@@ -366,9 +366,6 @@ static int uif_init(struct ubi_device *ubi)
 	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);
 
 	/*
@@ -623,6 +620,58 @@ static int io_init(struct ubi_device *ubi)
 	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
@@ -699,6 +748,12 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
 	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);
@@ -707,8 +762,6 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int 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;
@@ -730,6 +783,12 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
 		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;

trunk/drivers/mtd/ubi/eba.c

@@ -341,9 +341,6 @@ int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
 {
 	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;
 
@@ -392,9 +389,6 @@ int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
 	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;
@@ -618,9 +612,6 @@ int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
 	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;
 
@@ -754,9 +745,6 @@ int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
 	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;
 
@@ -871,9 +859,6 @@ int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
 	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;
 

trunk/drivers/mtd/ubi/ubi.h

@@ -250,9 +250,11 @@ struct ubi_wl_entry;
  * @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
@@ -333,12 +335,14 @@ struct ubi_device {
 	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 */

trunk/drivers/mtd/ubi/vmt.c

@@ -497,8 +497,6 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
 
 	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) {

trunk/drivers/mtd/ubi/vtbl.c

@@ -514,6 +514,17 @@ static int init_volumes(struct ubi_device *ubi, const struct ubi_scan_info *si,
 		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;

trunk/drivers/mtd/ubi/wl.c

@@ -1303,7 +1303,6 @@ int ubi_wl_flush(struct ubi_device *ubi)
 	 * 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);
 

trunk/include/mtd/ubi-header.h

@@ -57,6 +57,43 @@ enum {
 	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.
  *
@@ -289,7 +326,8 @@ struct ubi_vid_hdr {
  * @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
@@ -324,7 +362,8 @@ struct ubi_vtbl_record {
 	__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));