[PATCH] md: remove MAX_MD_DEVS which is an arbitrary limit

Once upon a time we needed to fixed limit to the number of md devices,
probably because we preallocated some array.  This need no longer exists, but
we still have an arbitrary limit.

So remove MAX_MD_DEVS and allow as many devices as we can fit into the 'minor'
part of a device number.

Also remove some useless noise at init time (which reports MAX_MD_DEVS) and
remove MD_THREAD_NAME_MAX which hasn't been used for a while.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 18 insertions, 28 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index db1ac84a739a..40cb79ac4039 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3409,6 +3409,7 @@ static void autorun_devices(int part)
 
         printk(KERN_INFO "md: autorun ...\n");
         while (!list_empty(&pending_raid_disks)) {
+                int unit;
                 dev_t dev;
                 LIST_HEAD(candidates);
                 rdev0 = list_entry(pending_raid_disks.next,
@@ -3428,16 +3429,19 @@ static void autorun_devices(int part)
                  * mostly sane superblocks. It's time to allocate the
                  * mddev.
                  */
-                if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
+                if (part) {
+                        dev = MKDEV(mdp_major,
+                                    rdev0->preferred_minor << MdpMinorShift);
+                        unit = MINOR(dev) >> MdpMinorShift;
+                } else {
+                        dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
+                        unit = MINOR(dev);
+                }
+                if (rdev0->preferred_minor != unit) {
                         printk(KERN_INFO "md: unit number in %s is bad: %d\n",
                                bdevname(rdev0->bdev, b), rdev0->preferred_minor);
                         break;
                 }
-                if (part)
-                        dev = MKDEV(mdp_major,
-                                    rdev0->preferred_minor << MdpMinorShift);
-                else
-                        dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
 
                 md_probe(dev, NULL, NULL);
                 mddev = mddev_find(dev);
@@ -5524,22 +5528,15 @@ static void md_geninit(void)
 
 static int __init md_init(void)
 {
-        printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
-                        " MD_SB_DISKS=%d\n",
-                        MD_MAJOR_VERSION, MD_MINOR_VERSION,
-                        MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
-        printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
-                        BITMAP_MINOR);
-
         if (register_blkdev(MAJOR_NR, "md"))
                 return -1;
         if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
                 unregister_blkdev(MAJOR_NR, "md");
                 return -1;
         }
-        blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
-                                md_probe, NULL, NULL);
-        blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
+        blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
+                            md_probe, NULL, NULL);
+        blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
                             md_probe, NULL, NULL);
 
         register_reboot_notifier(&md_notifier);
@@ -5598,8 +5595,8 @@ static __exit void md_exit(void)
         mddev_t *mddev;
         struct list_head *tmp;
 
-        blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
-        blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
+        blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
+        blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
 
         unregister_blkdev(MAJOR_NR,"md");
         unregister_blkdev(mdp_major, "mdp");
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index e423dad1a7fd..8245c282168b 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -31,18 +31,15 @@
 #define LEVEL_NONE              (-1000000)
 
 #define MaxSector (~(sector_t)0)
-#define MD_THREAD_NAME_MAX 14
 
 typedef struct mddev_s mddev_t;
 typedef struct mdk_rdev_s mdk_rdev_t;
 
-#define MAX_MD_DEVS  256        /* Max number of md dev */
-
 /*
  * options passed in raidrun:
  */
 
-/* Currently this must fix in an 'int' */
+/* Currently this must fit in an 'int' */
 #define MAX_CHUNK_SIZE (1<<30)
 
 /*
diff --git a/init/do_mounts_md.c b/init/do_mounts_md.c
index 2429e1bf8c60..753dc54a6649 100644
--- a/init/do_mounts_md.c
+++ b/init/do_mounts_md.c
@@ -20,7 +20,7 @@ static struct {
         int level;
         int chunk;
         char *device_names;
-} md_setup_args[MAX_MD_DEVS] __initdata;
+} md_setup_args[256] __initdata;
 
 static int md_setup_ents __initdata;
 
@@ -61,10 +61,6 @@ static int __init md_setup(char *str)
                 return 0;
         }
         str1 = str;
-        if (minor >= MAX_MD_DEVS) {
-                printk(KERN_WARNING "md: md=%d, Minor device number too high.\n", minor);
-                return 0;
-        }
         for (ent=0 ; ent< md_setup_ents ; ent++)
                 if (md_setup_args[ent].minor == minor &&
                     md_setup_args[ent].partitioned == partitioned) {
@@ -72,7 +68,7 @@ static int __init md_setup(char *str)
                                "Replacing previous definition.\n", partitioned?"d":"", minor);
                         break;
                 }
-        if (ent >= MAX_MD_DEVS) {
+        if (ent >= ARRAY_SIZE(md_setup_args)) {
                 printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
                 return 0;
         }