Allow --update to add or remove space for a bad block list.

[thirdparty/mdadm.git] / super1.c

diff --git a/super1.c b/super1.c
index c0e6cd79328c04fad95905579a7b1eabbf085195..4c29d6e1281bad504d64af911421c1bc2d9f9818 100644 (file)
--- a/super1.c
+++ b/super1.c
@@ -850,6 +850,56 @@ static int update_super1(struct supertype *st, struct mdinfo *info,
                }
        } else if (strcmp(update, "no-bitmap") == 0) {
                sb->feature_map &= ~__cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
+       } else if (strcmp(update, "bbl") == 0) {
+               /* only possible if there is room after the bitmap, or if
+                * there is no bitmap
+                */
+               unsigned long long sb_offset = __le64_to_cpu(sb->super_offset);
+               unsigned long long data_offset = __le64_to_cpu(sb->data_offset);
+               long bitmap_offset = (long)__le64_to_cpu(sb->bitmap_offset);
+               long bm_sectors = 0;
+               long space;
+
+               if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
+                       struct bitmap_super_s *bsb;
+                       bsb = (struct bitmap_super_s *)(((char*)sb)+MAX_SB_SIZE);
+                       bm_sectors = bitmap_sectors(bsb);
+               }
+
+               if (sb_offset < data_offset) {
+                       /* 1.1 or 1.2.  Put bbl just before data
+                        */
+                       long bb_offset;
+                       space = data_offset - sb_offset;
+                       bb_offset = space - 8;
+                       if (bm_sectors && bitmap_offset > 0)
+                               space -= (bitmap_offset + bm_sectors);
+                       else
+                               space -= 8; /* The superblock */
+                       if (space >= 8) {
+                               sb->bblog_size = __cpu_to_le16(8);
+                               sb->bblog_offset = __cpu_to_le32(bb_offset);
+                       }
+               } else {
+                       /* 1.0 - Put bbl just before super block */
+                       if (bm_sectors && bitmap_offset < 0)
+                               space = -bitmap_offset - bm_sectors;
+                       else
+                               space = sb_offset - data_offset -
+                                       __le64_to_cpu(sb->data_size);
+                       if (space >= 8) {
+                               sb->bblog_size = __cpu_to_le16(8);
+                               sb->bblog_offset = __cpu_to_le32((unsigned)-8);
+                       }
+               }
+       } else if (strcmp(update, "no-bbl") == 0) {
+               if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BAD_BLOCKS))
+                       pr_err("Cannot remove active bbl from %s\n",devname);
+               else {
+                       sb->bblog_size = 0;
+                       sb->bblog_shift = 0;
+                       sb->bblog_offset = 0;
+               }
        } else if (strcmp(update, "homehost") == 0 &&
                   homehost) {
                char *c;