UBI: block: Dynamically allocate minor numbers

This patch makes ubiblock devices have minor numbers beginning from
0, allocated dynamically independently of the ubi device/volume
number. This property becomes useful because, on 32-bit architectures
with LFS turned off in a userspace program, device minor numbers
over 8 bits cause stat to return -EOVERFLOW. If the device number is
high (>1) due to multiple MTD partitions, such an overflow will occur.
While enabling LFS is clearly a nicer solution, it's often difficult
to turn on in practice globally as many widely distributed packages
don't work with LFS on.

Other storage systems have their own workarounds, with SCSI making
multiple device majors and MMC having a config option for the number
of partitions per device. A completely dynamic minor numbering is
simpler than these. It is unlikely that anyone is depending on a
static minor number since the major is dynamic anyway. In addition,
ubiblock is still relatively new, so now is the time to make such
changes.

Signed-off-by: Dan Ehrenberg <dehrenberg@chromium.org>
Acked-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Richard Weinberger <richard@nod.at>

diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index c9eb78f10a0db829ca396539ccf49331c9f06a1e..1a92d30689e76e5cd1ce1a22bff6bbac6a1bbbbb 100644 (file)
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -48,6 +48,7 @@
 #include <linux/blk-mq.h>
 #include <linux/hdreg.h>
 #include <linux/scatterlist.h>
+#include <linux/idr.h>
 #include <asm/div64.h>
 
 #include "ubi-media.h"
@@ -353,6 +354,8 @@ static struct blk_mq_ops ubiblock_mq_ops = {
        .map_queue      = blk_mq_map_queue,
 };
 
+static DEFINE_IDR(ubiblock_minor_idr);
+
 int ubiblock_create(struct ubi_volume_info *vi)
 {
        struct ubiblock *dev;
@@ -390,7 +393,13 @@ int ubiblock_create(struct ubi_volume_info *vi)
 
        gd->fops = &ubiblock_ops;
        gd->major = ubiblock_major;
-       gd->first_minor = dev->ubi_num * UBI_MAX_VOLUMES + dev->vol_id;
+       gd->first_minor = idr_alloc(&ubiblock_minor_idr, dev, 0, 0, GFP_KERNEL);
+       if (gd->first_minor < 0) {
+               dev_err(disk_to_dev(gd),
+                       "block: dynamic minor allocation failed");
+               ret = -ENODEV;
+               goto out_put_disk;
+       }
        gd->private_data = dev;
        sprintf(gd->disk_name, "ubiblock%d_%d", dev->ubi_num, dev->vol_id);
        set_capacity(gd, disk_capacity);
@@ -407,7 +416,7 @@ int ubiblock_create(struct ubi_volume_info *vi)
        ret = blk_mq_alloc_tag_set(&dev->tag_set);
        if (ret) {
                dev_err(disk_to_dev(dev->gd), "blk_mq_alloc_tag_set failed");
-               goto out_put_disk;
+               goto out_remove_minor;
        }
 
        dev->rq = blk_mq_init_queue(&dev->tag_set);
@@ -445,6 +454,8 @@ out_free_queue:
        blk_cleanup_queue(dev->rq);
 out_free_tags:
        blk_mq_free_tag_set(&dev->tag_set);
+out_remove_minor:
+       idr_remove(&ubiblock_minor_idr, gd->first_minor);
 out_put_disk:
        put_disk(dev->gd);
 out_free_dev:
@@ -463,6 +474,7 @@ static void ubiblock_cleanup(struct ubiblock *dev)
        blk_cleanup_queue(dev->rq);
        blk_mq_free_tag_set(&dev->tag_set);
        dev_info(disk_to_dev(dev->gd), "released");
+       idr_remove(&ubiblock_minor_idr, dev->gd->first_minor);
        put_disk(dev->gd);
 }