Many files:

  Checkin of e2fsprogs 1.03.

1 files changed, 88 insertions, 0 deletions

diff --git a/misc/findsuper.c b/misc/findsuper.c
new file mode 100644
index 00000000..1832de5b
--- /dev/null
+++ b/misc/findsuper.c
@@ -0,0 +1,88 @@
+/* Well, here's my linux version of findsuper.
+ * I'm sure you coulda done it faster.  :)
+ * IMHO there isn't as much interesting data to print in the
+ * linux superblock as there is in the SunOS superblock--disk geometry is
+ * not there...and linux seems to update the dates in all the superblocks.
+ * SunOS doesn't ever touch the backup superblocks after the fs is created,
+ * as far as I can tell, so the date is more interesting IMHO and certainly
+ * marks which superblocks are backup ones.
+ *
+ * This still doesn't handle disks >2G.
+ *
+ * I wanted to add msdos support, but I couldn't make heads or tails
+ * of the kernel include files to find anything I could look for in msdos.
+ * 
+ * Reading every block of a Sun partition is fairly quick.  Doing the
+ * same under linux (slower hardware I suppose) just isn't the same.
+ * It might be more useful to default to reading the first (second?) block
+ * on each cyl; however, if the disk geometry is wrong, this is useless.
+ * But ya could still get the cyl size to print the numbers as cyls instead
+ * of blocks...
+ *
+ * run this as (for example)
+ *   findsuper /dev/hda
+ *   findsuper /dev/hda 437760 1024   (my disk has cyls of 855*512)
+ *
+ * I suppose the next step is to figgure out a way to determine if
+ * the block found is the first superblock somehow, and if so, build
+ * a partition table from the superblocks found... but this is still
+ * useful as is.
+ *
+ *		Steve
+ * ssd@nevets.oau.org
+ * ssd@mae.engr.ucf.edu
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include <linux/ext2_fs.h>
+
+
+main(int argc, char *argv[])
+{
+  int i;
+  int skiprate=512;		/* one sector */
+  long sk=0;			/* limited to 2G filesystems!! */
+  FILE *f;
+  char *s;
+
+  struct ext2_super_block ext2;
+  /* interesting fields: EXT2_SUPER_MAGIC
+     s_blocks_count s_log_block_size s_mtime s_magic s_lastcheck */
+  
+  if (argc<2) {
+    fprintf(stderr,"Usage:  findsuper device [skiprate [start]]\n");
+    exit(1);
+  }
+  if (argc>2) skiprate=atoi(argv[2]);
+  if (skiprate<512){
+    fprintf(stderr,"Do you really want to skip less than a sector??\n");
+    exit(2);
+  }
+  if (argc>3) sk=atol(argv[3]);
+  if (sk<0) {
+    fprintf(stderr,"Have to start at 0 or greater,not %ld\n",sk);
+    exit(1);
+  }
+  f=fopen(argv[1],"r");
+  if (!f){
+    perror(argv[1]);
+    exit(1);
+  }
+ 
+  /* Now, go looking for the superblock ! */
+  printf("  thisoff     block fs_blk_sz  blksz last_mount\n");
+  for (;!feof(f) &&  (i=fseek(f,sk,SEEK_SET))!= -1; sk+=skiprate){
+    if (i=fread(&ext2,sizeof(ext2),1, f)!=1){
+      perror("read failed");
+    } else if (ext2.s_magic == EXT2_SUPER_MAGIC){
+      s=ctime(&ext2.s_mtime);
+      s[24]=0;
+      printf("%9ld %9ld %9ld %5ld %s\n",sk,sk/1024,ext2.s_blocks_count,ext2.s_log_block_size,s);
+    }
+  }
+  printf("Failed on %d at %ld\n",i,sk);
+  fclose(f);
+}