UBI: Add initial support for scatter gather
Adds a new set of functions to deal with scatter gather.
ubi_eba_read_leb_sg() will read from a LEB into a scatter gather list.
The new data structure struct ubi_sgl will be used within UBI to
hold the scatter gather list itself and metadata to have a cursor
within the list.
Signed-off-by: Richard Weinberger <richard@nod.at>
Tested-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index 589c423..478e00c 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -366,6 +366,43 @@
EXPORT_SYMBOL_GPL(ubi_close_volume);
/**
+ * leb_read_sanity_check - does sanity checks on read requests.
+ * @desc: volume descriptor
+ * @lnum: logical eraseblock number to read from
+ * @offset: offset within the logical eraseblock to read from
+ * @len: how many bytes to read
+ *
+ * This function is used by ubi_leb_read() and ubi_leb_read_sg()
+ * to perform sanity checks.
+ */
+static int leb_read_sanity_check(struct ubi_volume_desc *desc, int lnum,
+ int offset, int len)
+{
+ struct ubi_volume *vol = desc->vol;
+ struct ubi_device *ubi = vol->ubi;
+ int vol_id = vol->vol_id;
+
+ if (vol_id < 0 || vol_id >= ubi->vtbl_slots || lnum < 0 ||
+ lnum >= vol->used_ebs || offset < 0 || len < 0 ||
+ offset + len > vol->usable_leb_size)
+ return -EINVAL;
+
+ if (vol->vol_type == UBI_STATIC_VOLUME) {
+ if (vol->used_ebs == 0)
+ /* Empty static UBI volume */
+ return 0;
+ if (lnum == vol->used_ebs - 1 &&
+ offset + len > vol->last_eb_bytes)
+ return -EINVAL;
+ }
+
+ if (vol->upd_marker)
+ return -EBADF;
+
+ return 0;
+}
+
+/**
* ubi_leb_read - read data.
* @desc: volume descriptor
* @lnum: logical eraseblock number to read from
@@ -401,22 +438,10 @@
dbg_gen("read %d bytes from LEB %d:%d:%d", len, vol_id, lnum, offset);
- if (vol_id < 0 || vol_id >= ubi->vtbl_slots || lnum < 0 ||
- lnum >= vol->used_ebs || offset < 0 || len < 0 ||
- offset + len > vol->usable_leb_size)
- return -EINVAL;
+ err = leb_read_sanity_check(desc, lnum, offset, len);
+ if (err < 0)
+ return err;
- if (vol->vol_type == UBI_STATIC_VOLUME) {
- if (vol->used_ebs == 0)
- /* Empty static UBI volume */
- return 0;
- if (lnum == vol->used_ebs - 1 &&
- offset + len > vol->last_eb_bytes)
- return -EINVAL;
- }
-
- if (vol->upd_marker)
- return -EBADF;
if (len == 0)
return 0;
@@ -430,6 +455,46 @@
}
EXPORT_SYMBOL_GPL(ubi_leb_read);
+
+/**
+ * ubi_leb_read_sg - read data into a scatter gather list.
+ * @desc: volume descriptor
+ * @lnum: logical eraseblock number to read from
+ * @buf: buffer where to store the read data
+ * @offset: offset within the logical eraseblock to read from
+ * @len: how many bytes to read
+ * @check: whether UBI has to check the read data's CRC or not.
+ *
+ * This function works exactly like ubi_leb_read_sg(). But instead of
+ * storing the read data into a buffer it writes to an UBI scatter gather
+ * list.
+ */
+int ubi_leb_read_sg(struct ubi_volume_desc *desc, int lnum, struct ubi_sgl *sgl,
+ int offset, int len, int check)
+{
+ struct ubi_volume *vol = desc->vol;
+ struct ubi_device *ubi = vol->ubi;
+ int err, vol_id = vol->vol_id;
+
+ dbg_gen("read %d bytes from LEB %d:%d:%d", len, vol_id, lnum, offset);
+
+ err = leb_read_sanity_check(desc, lnum, offset, len);
+ if (err < 0)
+ return err;
+
+ if (len == 0)
+ return 0;
+
+ err = ubi_eba_read_leb_sg(ubi, vol, sgl, lnum, offset, len, check);
+ if (err && mtd_is_eccerr(err) && vol->vol_type == UBI_STATIC_VOLUME) {
+ ubi_warn(ubi, "mark volume %d as corrupted", vol_id);
+ vol->corrupted = 1;
+ }
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(ubi_leb_read_sg);
+
/**
* ubi_leb_write - write data.
* @desc: volume descriptor