source: gpfs_3.1_ker2.6.20/lpp/mmfs/src/bin/mmdumpfilocks.sial @ 41

/* @(#)27       1.2  src/avs/fs/mmfs/ts/kernext/gpl-linux/mmdumpfilocks.sial, mmfs, avs_rgpfs24, rgpfs240610b 10/17/02 21:25:23 */

/* lcrash sial script to display file_lock structures.
 * Loaded and executed from mmdumpfilock.sh to support
 * the "mmfsadm dump fillocks" command.
 */
string mmdumpfilocks_help()  { return ""; }
string mmdumpfilocks_opt()   { return ""; }
string mmdumpfilocks_usage() { return ""; }

typedef struct list_head_t {
  struct list_head *next, *prev;
} list_head_t;

int
mmdumpfilocks()
{
  char *fsP;
  int ino, dev, nLocks;
  int link_offset, block_offset;
  list_head_t *lhP, *nextP;
  list_head_t *bhP, *blockP;
  struct file_lock *flP, *blP;

  printf("\n");

  /* file_lock_list is the anchor of all locks */
  if (exists("file_lock_list"))
  {
    lhP = (list_head_t *)file_lock_list;
    flP = (struct file_lock *)lhP->next;
    link_offset = (int)&flP->fl_link - (int)flP;
    block_offset = (int)&flP->fl_block - (int)flP;

    nLocks = 0;

    /* Loop through the fl_link.next chain (circular) */
    while (flP != lhP) {

      /* Back-up to top of file_lock */
      flP = (struct file_lock *) ((int)flP - link_offset);

      /* Only show GPFS locks */
      fsP = flP->fl_file->f_dentry->d_sb->s_type->name;
      if (fsP[0] == 'g' && fsP[1] == 'p' && fsP[2] == 'f' && fsP[3] == 's') { 

        if (!nLocks++) {
          /* Header line */
          printf("file_lock  maj:min    inode      pid  type      start        end\n");
          printf("---------- ------- -------- -------- ----- ---------- ----------\n");
        }

        /* collect inode and dev to easily identify the file */
        ino = flP->fl_file->f_dentry->d_inode->i_ino;
        dev = flP->fl_file->f_dentry->d_inode->i_dev;

        /* display some of the lock fields. */
        printf("0x%8X %0.3d:%0.3d %8d %8d %5s %10d %10d\n", 
                flP, dev>>8, dev & 0xFF, ino, flP->fl_pid, 
                flP->fl_type==0? "READ": (flP->fl_type==1? "WRITE":"?"),
                flP->fl_start, flP->fl_end);  

        /* Follow fl_block so we can match up "reclockSleepers" */
        bhP = (list_head_t *)(&flP->fl_block);
        blP = (struct file_lock *)bhP->next;

        /* Loop through the fl_block.next chain (circular) */
        while (blP != bhP) {

          /* Back-up to top of file_lock */
          blP = (struct file_lock *) ((int)blP - block_offset);

          /* display some of the lock fields.  One line per lock. */
          printf("0x%8X %0.3d:%0.3d %8d %8d %5s %10d %10d waiting\n", 
                  blP, dev>>8, dev & 0xFF, ino, blP->fl_pid, 
                  blP->fl_type==0? "READ": (blP->fl_type==1? "WRITE":"?"),
                  blP->fl_start, blP->fl_end);  

          /* Move to the next file_lock in the block list. */
          blockP = (list_head_t *)(&blP->fl_block);
          blP = (struct file_lock *)blockP->next;
        } /* Done with the fl_block chain. */

      }
      /* Move to the next file_lock in the fl_link list and continue. */
      nextP = (list_head_t *)(&flP->fl_link);
      flP = (struct file_lock *)nextP->next;
    }
  }
  else
  {
    printf("The \"file_lock_list\" symbol cannot be found in this memory image.\n");
    printf("Did you give lcrash a /var/mmfs/tmp/complete.map?\n");
  }
  return 0;
}