Merge branch 'linux-next' of git://git.infradead.org/ubifs-2.6

* 'linux-next' of git://git.infradead.org/ubifs-2.6: (25 commits)
  UBIFS: clean-up commentaries
  UBIFS: save 128KiB or more RAM
  UBIFS: allocate orphans scan buffer on demand
  UBIFS: allocate lpt dump buffer on demand
  UBIFS: allocate ltab checking buffer on demand
  UBIFS: allocate scanning buffer on demand
  UBIFS: allocate dump buffer on demand
  UBIFS: do not check data crc by default
  UBIFS: simplify UBIFS Kconfig menu
  UBIFS: print max. index node size
  UBIFS: handle allocation failures in UBIFS write path
  UBIFS: use max_write_size during recovery
  UBIFS: use max_write_size for write-buffers
  UBIFS: introduce write-buffer size field
  UBI: incorporate LEB offset information
  UBIFS: incorporate maximum write size
  UBI: provide LEB offset information
  UBI: incorporate maximum write size
  UBIFS: fix LEB number in printk
  UBIFS: restrict world-writable debugfs files
  ...

3 files changed, 19 insertions, 0 deletions

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index a801ea6b8b6d..65626c1c446d 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -690,11 +690,25 @@ static int io_init(struct ubi_device *ubi)
         ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size);
         ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0);
 
+        ubi->max_write_size = ubi->mtd->writebufsize;
+        /*
+         * Maximum write size has to be greater or equivalent to min. I/O
+         * size, and be multiple of min. I/O size.
+         */
+        if (ubi->max_write_size < ubi->min_io_size ||
+            ubi->max_write_size % ubi->min_io_size ||
+            !is_power_of_2(ubi->max_write_size)) {
+                ubi_err("bad write buffer size %d for %d min. I/O unit",
+                        ubi->max_write_size, ubi->min_io_size);
+                return -EINVAL;
+        }
+
         /* Calculate default aligned sizes of EC and VID headers */
         ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size);
         ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size);
 
         dbg_msg("min_io_size      %d", ubi->min_io_size);
+        dbg_msg("max_write_size   %d", ubi->max_write_size);
         dbg_msg("hdrs_min_io_size %d", ubi->hdrs_min_io_size);
         dbg_msg("ec_hdr_alsize    %d", ubi->ec_hdr_alsize);
         dbg_msg("vid_hdr_alsize   %d", ubi->vid_hdr_alsize);
diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index 69fa4ef03c53..d39716e5b204 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -40,7 +40,9 @@ void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di)
 {
         di->ubi_num = ubi->ubi_num;
         di->leb_size = ubi->leb_size;
+        di->leb_start = ubi->leb_start;
         di->min_io_size = ubi->min_io_size;
+        di->max_write_size = ubi->max_write_size;
         di->ro_mode = ubi->ro_mode;
         di->cdev = ubi->cdev.dev;
 }
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 49c864d175db..f1be8b79663c 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -382,6 +382,8 @@ struct ubi_wl_entry;
  * @bad_allowed: whether the MTD device admits of bad physical eraseblocks or
  *               not
  * @nor_flash: non-zero if working on top of NOR flash
+ * @max_write_size: maximum amount of bytes the underlying flash can write at a
+ *                  time (MTD write buffer size)
  * @mtd: MTD device descriptor
  *
  * @peb_buf1: a buffer of PEB size used for different purposes
@@ -463,6 +465,7 @@ struct ubi_device {
         int vid_hdr_shift;
         unsigned int bad_allowed:1;
         unsigned int nor_flash:1;
+        int max_write_size;
         struct mtd_info *mtd;
 
         void *peb_buf1;