Linus,
md currently has two #defines which give a limit to the number of
devices that can be in a given raid array:
MAX_REAL (==12) dates back to the time before we had persistent
superblocks, and mostly affects raid0
MD_SB_DISKS (==27) is a characteristic of the newer persistent
superblocks and says how many devices can be described in a
superblock.
Have the two is inconsistent and needlessly limits raid0 arrays.
This patch replaces MAX_REAL in the few places that it occurs with
MD_SB_DISKS.
Thanks to Gary Murakami <[EMAIL PROTECTED]> for prodding me to
make this patch.
NeilBrown
--- ./include/linux/raid/md_k.h 2000/11/29 04:54:32 1.1
+++ ./include/linux/raid/md_k.h 2000/11/29 04:55:47 1.2
@@ -59,7 +59,6 @@
#error MD doesnt handle bigger kdev yet
#endif
-#define MAX_REAL 12 /* Max number of disks per md dev */
#define MAX_MD_DEVS (1<<MINORBITS) /* Max number of md dev */
/*
--- ./include/linux/raid/raid0.h 2000/11/29 04:54:32 1.1
+++ ./include/linux/raid/raid0.h 2000/11/29 04:55:47 1.2
@@ -9,7 +9,7 @@
unsigned long dev_offset; /* Zone offset in real dev */
unsigned long size; /* Zone size */
int nb_dev; /* # of devices attached to the zone */
- mdk_rdev_t *dev[MAX_REAL]; /* Devices attached to the zone */
+ mdk_rdev_t *dev[MD_SB_DISKS]; /* Devices attached to the zone */
};
struct raid0_hash
--- ./drivers/md/md.c 2000/11/29 04:49:29 1.3
+++ ./drivers/md/md.c 2000/11/29 04:55:47 1.4
@@ -3587,9 +3587,9 @@
{
static char * name = "mdrecoveryd";
- printk (KERN_INFO "md driver %d.%d.%d MAX_MD_DEVS=%d, MAX_REAL=%d\n",
+ printk (KERN_INFO "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, MAX_REAL);
+ MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
if (devfs_register_blkdev (MAJOR_NR, "md", &md_fops))
{
@@ -3639,7 +3639,7 @@
unsigned long set;
int pers[MAX_MD_BOOT_DEVS];
int chunk[MAX_MD_BOOT_DEVS];
- kdev_t devices[MAX_MD_BOOT_DEVS][MAX_REAL];
+ kdev_t devices[MAX_MD_BOOT_DEVS][MD_SB_DISKS];
} md_setup_args md__initdata = { 0, };
/*
@@ -3713,7 +3713,7 @@
pername="super-block";
}
devnames = str;
- for (; i<MAX_REAL && str; i++) {
+ for (; i<MD_SB_DISKS && str; i++) {
if ((device = name_to_kdev_t(str))) {
md_setup_args.devices[minor][i] = device;
} else {
-
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