imsm: add support for checkpointing via 'curr_migr_unit'

[thirdparty/mdadm.git] / bitmap.c

diff --git a/bitmap.c b/bitmap.c
index 86176696f957edef9d88955e869612ba6c47de85..088e37d0ad79f90bcf02c31684b2a2c9aeb6f8b4 100644 (file)
--- a/bitmap.c
+++ b/bitmap.c
@@ -20,8 +20,6 @@
 
 #include "mdadm.h"
 
-#define min(a,b) (((a) < (b)) ? (a) : (b))
-
 inline void sb_le_to_cpu(bitmap_super_t *sb)
 {
        sb->magic = __le32_to_cpu(sb->magic);
@@ -115,6 +113,15 @@ unsigned long long bitmap_bits(unsigned long long array_size,
        return (array_size * 512 + chunksize - 1) / chunksize;
 }
 
+unsigned long bitmap_sectors(struct bitmap_super_s *bsb)
+{
+       unsigned long long bits = bitmap_bits(__le64_to_cpu(bsb->sync_size),
+                                             __le32_to_cpu(bsb->chunksize));
+       int bits_per_sector = 8*512;
+       return (bits + bits_per_sector - 1) / bits_per_sector;
+}
+
+
 bitmap_info_t *bitmap_fd_read(int fd, int brief)
 {
        /* Note: fd might be open O_DIRECT, so we must be
@@ -125,7 +132,10 @@ bitmap_info_t *bitmap_fd_read(int fd, int brief)
        void *buf;
        int n, skip;
 
-       posix_memalign(&buf, 512, 8192);
+       if (posix_memalign(&buf, 512, 8192) != 0) {
+               fprintf(stderr, Name ": failed to allocate 8192 bytes\n");
+               return NULL;
+       }
        n = read(fd, buf, 8192);
 
        info = malloc(sizeof(*info));
@@ -151,7 +161,7 @@ bitmap_info_t *bitmap_fd_read(int fd, int brief)
 
        sb_le_to_cpu(&info->sb); /* convert superblock to CPU byte ordering */
 
-       if (brief || info->sb.sync_size == 0)
+       if (brief || info->sb.sync_size == 0 || info->sb.chunksize == 0)
                goto out;
 
        /* read the rest of the file counting total bits and dirty bits --
@@ -259,6 +269,7 @@ int ExamineBitmap(char *filename, int brief, struct supertype *st)
        int rv = 1;
        char buf[64];
        int swap;
+       __u32 uuid32[4];
 
        info = bitmap_file_read(filename, brief, &st);
        if (!info)
@@ -286,19 +297,20 @@ int ExamineBitmap(char *filename, int brief, struct supertype *st)
 #else
                swap = 1;
 #endif
-       if (swap) {
-       printf("            UUID : %08x:%08x:%08x:%08x\n",
-                                       swapl(*(__u32 *)(sb->uuid+0)),
-                                       swapl(*(__u32 *)(sb->uuid+4)),
-                                       swapl(*(__u32 *)(sb->uuid+8)),
-                                       swapl(*(__u32 *)(sb->uuid+12)));
-       } else {
-       printf("            UUID : %08x:%08x:%08x:%08x\n",
-                                       *(__u32 *)(sb->uuid+0),
-                                       *(__u32 *)(sb->uuid+4),
-                                       *(__u32 *)(sb->uuid+8),
-                                       *(__u32 *)(sb->uuid+12));
-       }
+       memcpy(uuid32, sb->uuid, 16);
+       if (swap)
+               printf("            UUID : %08x:%08x:%08x:%08x\n",
+                      swapl(uuid32[0]),
+                      swapl(uuid32[1]),
+                      swapl(uuid32[2]),
+                      swapl(uuid32[3]));
+       else
+               printf("            UUID : %08x:%08x:%08x:%08x\n",
+                      uuid32[0],
+                      uuid32[1],
+                      uuid32[2],
+                      uuid32[3]);
+
        printf("          Events : %llu\n", (unsigned long long)sb->events);
        printf("  Events Cleared : %llu\n", (unsigned long long)sb->events_cleared);
        printf("           State : %s\n", bitmap_state(sb->state));