lfsckfmt.c

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/* lfckfmt.c - lfckfmt */

#include <xinu.h>
#include <ramdisk.h>

/*------------------------------------------------------------------------
 * lfckfmt  -  Check the format of an initially-created disk
 *------------------------------------------------------------------------
 */
status  lfsckfmt (
      did32     disk        /* ID of an open disk device    */
    )
{
    uint32  ibsectors;      /* Number of sectors of i-blocks*/
    struct  lfdir   dir;        /* Buffer to hold the directory */
    uint32  dblks;          /* Total free data blocks   */
    struct  lfiblk  iblock;     /* Space for one i-block    */
    struct  lfdbfree dblock;    /* Data block on the free list  */
    int32   lfiblks;        /* Total free index blocks  */
    int32   retval;
    ibid32  nextib;
    dbid32  nextdb;

    /* Read directory */

    retval = read(disk,(char *)&dir, LF_AREA_DIR);
    if (retval == SYSERR) {
        panic("cannot read directory");
    }
    kprintf("Have read directory from disk device %d\n\r",
        disk);

    /* Check to see if directory contains a Xinu file system */

    if (lfscheck(&dir) == SYSERR) {
        panic("directory does not contain a Xinu file system");
    }
    kprintf("Directory corresponds to a local Xinu file system\n");

    /* Follow index block list */

    lfiblks = 0;
    nextib = dir.lfd_ifree;
    kprintf("initial index block is %d\n\r", nextib);
    while (nextib != LF_INULL) {
        lfiblks++;
        lfibget(disk, nextib, &iblock);
        nextib = iblock.ib_next;
    }
    ibsectors = (lfiblks + 6) /7;
    kprintf("Found %d index blocks (%d sectors)\n\r", lfiblks, ibsectors);

    /* Follow data block list */

    dblks = 0;
    nextdb = dir.lfd_dfree;
    kprintf("initial data block is %d\n\r", nextdb);
    while (nextdb != LF_DNULL) {
        dblks++;
        read(disk, (char *)&dblock, nextdb);
        nextdb = dblock.lf_nextdb;
    }
    kprintf("Found %d data blocks\n\r", dblks);
    return OK;
}