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-rw-r--r--include/linux/mtd/ubi.h17
-rw-r--r--include/mtd/ubi-header.h47
-rw-r--r--include/mtd/ubi-user.h51
3 files changed, 91 insertions, 24 deletions
diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h
index c4abe035122..f71201d0f3e 100644
--- a/include/linux/mtd/ubi.h
+++ b/include/linux/mtd/ubi.h
@@ -26,23 +26,6 @@
#include <mtd/ubi-user.h>
/*
- * UBI data type hint constants.
- *
- * UBI_LONGTERM: long-term data
- * UBI_SHORTTERM: short-term data
- * UBI_UNKNOWN: data persistence is unknown
- *
- * These constants are used when data is written to UBI volumes in order to
- * help the UBI wear-leveling unit to find more appropriate physical
- * eraseblocks.
- */
-enum {
- UBI_LONGTERM = 1,
- UBI_SHORTTERM,
- UBI_UNKNOWN
-};
-
-/*
* enum ubi_open_mode - UBI volume open mode constants.
*
* UBI_READONLY: read-only mode
diff --git a/include/mtd/ubi-header.h b/include/mtd/ubi-header.h
index 74efa776347..292f916ea56 100644
--- a/include/mtd/ubi-header.h
+++ b/include/mtd/ubi-header.h
@@ -58,6 +58,43 @@ enum {
};
/*
+ * 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.
*
* @UBI_COMPAT_DELETE: delete this internal volume before anything is written
@@ -262,7 +299,9 @@ struct ubi_vid_hdr {
/* The layout volume contains the volume table */
-#define UBI_LAYOUT_VOL_ID UBI_INTERNAL_VOL_START
+#define UBI_LAYOUT_VOLUME_ID UBI_INTERNAL_VOL_START
+#define UBI_LAYOUT_VOLUME_TYPE UBI_VID_DYNAMIC
+#define UBI_LAYOUT_VOLUME_ALIGN 1
#define UBI_LAYOUT_VOLUME_EBS 2
#define UBI_LAYOUT_VOLUME_NAME "layout volume"
#define UBI_LAYOUT_VOLUME_COMPAT UBI_COMPAT_REJECT
@@ -289,7 +328,8 @@ 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 +364,8 @@ 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));
diff --git a/include/mtd/ubi-user.h b/include/mtd/ubi-user.h
index 4d184a7f80a..a7421f130cc 100644
--- a/include/mtd/ubi-user.h
+++ b/include/mtd/ubi-user.h
@@ -63,7 +63,7 @@
*
* Volume update should be done via the %UBI_IOCVOLUP IOCTL command of the
* corresponding UBI volume character device. A pointer to a 64-bit update
- * size should be passed to the IOCTL. After then, UBI expects user to write
+ * size should be passed to the IOCTL. After this, UBI expects user to write
* this number of bytes to the volume character device. The update is finished
* when the claimed number of bytes is passed. So, the volume update sequence
* is something like:
@@ -72,6 +72,15 @@
* ioctl(fd, UBI_IOCVOLUP, &image_size);
* write(fd, buf, image_size);
* close(fd);
+ *
+ * Atomic eraseblock change
+ * ~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * Atomic eraseblock change operation is done via the %UBI_IOCEBCH IOCTL
+ * command of the corresponding UBI volume character device. A pointer to
+ * &struct ubi_leb_change_req has to be passed to the IOCTL. Then the user is
+ * expected to write the requested amount of bytes. This is similar to the
+ * "volume update" IOCTL.
*/
/*
@@ -113,11 +122,30 @@
#define UBI_IOCVOLUP _IOW(UBI_VOL_IOC_MAGIC, 0, int64_t)
/* An eraseblock erasure command, used for debugging, disabled by default */
#define UBI_IOCEBER _IOW(UBI_VOL_IOC_MAGIC, 1, int32_t)
+/* An atomic eraseblock change command */
+#define UBI_IOCEBCH _IOW(UBI_VOL_IOC_MAGIC, 2, int32_t)
/* Maximum MTD device name length supported by UBI */
#define MAX_UBI_MTD_NAME_LEN 127
/*
+ * UBI data type hint constants.
+ *
+ * UBI_LONGTERM: long-term data
+ * UBI_SHORTTERM: short-term data
+ * UBI_UNKNOWN: data persistence is unknown
+ *
+ * These constants are used when data is written to UBI volumes in order to
+ * help the UBI wear-leveling unit to find more appropriate physical
+ * eraseblocks.
+ */
+enum {
+ UBI_LONGTERM = 1,
+ UBI_SHORTTERM = 2,
+ UBI_UNKNOWN = 3,
+};
+
+/*
* UBI volume type constants.
*
* @UBI_DYNAMIC_VOLUME: dynamic volume
@@ -125,7 +153,7 @@
*/
enum {
UBI_DYNAMIC_VOLUME = 3,
- UBI_STATIC_VOLUME = 4,
+ UBI_STATIC_VOLUME = 4,
};
/**
@@ -137,7 +165,7 @@ enum {
*
* This data structure is used to specify MTD device UBI has to attach and the
* parameters it has to use. The number which should be assigned to the new UBI
- * device is passed in @ubi_num. UBI may automatically assing the number if
+ * device is passed in @ubi_num. UBI may automatically assign the number if
* @UBI_DEV_NUM_AUTO is passed. In this case, the device number is returned in
* @ubi_num.
*
@@ -176,7 +204,7 @@ struct ubi_attach_req {
* @padding2: reserved for future, not used, has to be zeroed
* @name: volume name
*
- * This structure is used by userspace programs when creating new volumes. The
+ * This structure is used by user-space programs when creating new volumes. The
* @used_bytes field is only necessary when creating static volumes.
*
* The @alignment field specifies the required alignment of the volume logical
@@ -222,4 +250,19 @@ struct ubi_rsvol_req {
int32_t vol_id;
} __attribute__ ((packed));
+/**
+ * struct ubi_leb_change_req - a data structure used in atomic logical
+ * eraseblock change requests.
+ * @lnum: logical eraseblock number to change
+ * @bytes: how many bytes will be written to the logical eraseblock
+ * @dtype: data type (%UBI_LONGTERM, %UBI_SHORTTERM, %UBI_UNKNOWN)
+ * @padding: reserved for future, not used, has to be zeroed
+ */
+struct ubi_leb_change_req {
+ int32_t lnum;
+ int32_t bytes;
+ uint8_t dtype;
+ uint8_t padding[7];
+} __attribute__ ((packed));
+
#endif /* __UBI_USER_H__ */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-23 09:59:49 +0000