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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2007-12-06 18:47:30 +0200
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2007-12-26 19:15:14 +0200
commit393852ecfeec575ac78216b0eb58e4fd92f0816c (patch)
tree99edbcd7fee9cdaa69f51187834f93ada73feada /drivers/mtd/ubi/kapi.c
parent94780d4de2e9339ab93df63420db70f11882634d (diff)
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UBI: add ubi_leb_map interface
The idea of this interface belongs to Adrian Hunter. The interface is extremely useful when one has to have a guarantee that an LEB will contain all 0xFFs even in case of an unclean reboot. UBI does have an 'ubi_leb_erase()' call which may do this, but it is stupid and ineffecient, because it flushes whole queue. I should be re-worked to just be a pair of unmap, map calls. The user of the interfaci is UBIFS at the moment. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'drivers/mtd/ubi/kapi.c')
-rw-r--r--drivers/mtd/ubi/kapi.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index 03c774f4154..e1ef802a03a 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -547,6 +547,51 @@ int ubi_leb_unmap(struct ubi_volume_desc *desc, int lnum)
EXPORT_SYMBOL_GPL(ubi_leb_unmap);
/**
+ * ubi_leb_map - map logical erasblock to a physical eraseblock.
+ * @desc: volume descriptor
+ * @lnum: logical eraseblock number
+ * @dtype: expected data type
+ *
+ * This function maps an un-mapped logical eraseblock @lnum to a physical
+ * eraseblock. This means, that after a successfull invocation of this
+ * function the logical eraseblock @lnum will be empty (contain only %0xFF
+ * bytes) and be mapped to a physical eraseblock, even if an unclean reboot
+ * happens.
+ *
+ * This function returns zero in case of success, %-EBADF if the volume is
+ * damaged because of an interrupted update, %-EBADMSG if the logical
+ * eraseblock is already mapped, and other negative error codes in case of
+ * other failures.
+ */
+int ubi_leb_map(struct ubi_volume_desc *desc, int lnum, int dtype)
+{
+ struct ubi_volume *vol = desc->vol;
+ struct ubi_device *ubi = vol->ubi;
+ int vol_id = vol->vol_id;
+
+ dbg_msg("unmap LEB %d:%d", vol_id, lnum);
+
+ if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
+ return -EROFS;
+
+ if (lnum < 0 || lnum >= vol->reserved_pebs)
+ return -EINVAL;
+
+ if (dtype != UBI_LONGTERM && dtype != UBI_SHORTTERM &&
+ dtype != UBI_UNKNOWN)
+ return -EINVAL;
+
+ if (vol->upd_marker)
+ return -EBADF;
+
+ if (vol->eba_tbl[lnum] >= 0)
+ return -EBADMSG;
+
+ return ubi_eba_write_leb(ubi, vol_id, lnum, NULL, 0, 0, dtype);
+}
+EXPORT_SYMBOL_GPL(ubi_leb_map);
+
+/**
* ubi_is_mapped - check if logical eraseblock is mapped.
* @desc: volume descriptor
* @lnum: logical eraseblock number