Explain the read-balancing algorithm for RAID1 better in md.4

[thirdparty/mdadm.git] / super0.c

diff --git a/super0.c b/super0.c
index 30da8aa22c95dc28d5caf844ef972cff3019fb4d..0396c2cd81b4e26074de176c00444d1f818e45c9 100644 (file)
--- a/super0.c
+++ b/super0.c
@@ -624,7 +624,7 @@ static int store_super0(struct supertype *st, int fd, void *sbv)
        if (!get_dev_size(fd, NULL, &dsize))
                return 1;
 
-       if (dsize < MD_RESERVED_SECTORS*2*512)
+       if (dsize < MD_RESERVED_SECTORS*512)
                return 2;
 
        offset = MD_NEW_SIZE_SECTORS(dsize>>9);
@@ -731,7 +731,7 @@ static int load_super0(struct supertype *st, int fd, void **sbp, char *devname)
        if (!get_dev_size(fd, devname, &dsize))
                return 1;
 
-       if (dsize < MD_RESERVED_SECTORS*512 * 2) {
+       if (dsize < MD_RESERVED_SECTORS*512) {
                if (devname)
                        fprintf(stderr, Name
                            ": %s is too small for md: size is %llu sectors.\n",
@@ -835,7 +835,7 @@ static struct supertype *match_metadata_desc0(char *arg)
 
 static __u64 avail_size0(struct supertype *st, __u64 devsize)
 {
-       if (devsize < MD_RESERVED_SECTORS*2)
+       if (devsize < MD_RESERVED_SECTORS)
                return 0ULL;
        return MD_NEW_SIZE_SECTORS(devsize);
 }
@@ -893,7 +893,7 @@ void locate_bitmap0(struct supertype *st, int fd, void *sbv)
        if (!get_dev_size(fd, NULL, &dsize))
                return;
 
-       if (dsize < MD_RESERVED_SECTORS*512 * 2)
+       if (dsize < MD_RESERVED_SECTORS*512)
                return;
 
        offset = MD_NEW_SIZE_SECTORS(dsize>>9);
@@ -920,8 +920,8 @@ int write_bitmap0(struct supertype *st, int fd, void *sbv)
                return 1;
 
 
-       if (dsize < MD_RESERVED_SECTORS*512 * 2)
-       return -1;
+       if (dsize < MD_RESERVED_SECTORS*512)
+               return -1;
 
        offset = MD_NEW_SIZE_SECTORS(dsize>>9);