sd/ide-disk: apply extended minors to sd and ide

Update sd and ide-disk such that they can take advantage of extended
minors.

ide-disk already has 64 minors per device and currently doesn't use
extended minors although after this patch it can be turned on by
simply tweaking constants.

sd only had 16 minors per device causing problems on certain peculiar
configurations.  This patch lifts the restriction and enables it to
use upto 64 minors.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index e5e7d7856454..d1bb0e1d2d28 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -86,6 +86,10 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
 
+#define SD_PARTS        64
+#define SD_MINORS       16
+#define SD_EXT_MINORS   (SD_PARTS - SD_MINORS)
+
 static int  sd_revalidate_disk(struct gendisk *);
 static int  sd_probe(struct device *);
 static int  sd_remove(struct device *);
@@ -1801,7 +1805,7 @@ static int sd_probe(struct device *dev)
         if (!sdkp)
                 goto out;
 
-        gd = alloc_disk(16);
+        gd = alloc_disk_ext(SD_MINORS, SD_EXT_MINORS);
         if (!gd)
                 goto out_free;
 
@@ -1845,7 +1849,8 @@ static int sd_probe(struct device *dev)
 
         gd->major = sd_major((index & 0xf0) >> 4);
         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
-        gd->minors = 16;
+        gd->minors = SD_MINORS;
+        gd->ext_minors = SD_EXT_MINORS;
         gd->fops = &sd_fops;
 
         if (index < 26) {