lfibput.c File Reference

#include <xinu.h>

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Functions
status	lfibput (did32 diskdev, ibid32 inum, struct lfiblk *ibuff)

Function Documentation

lfibput()

status lfibput	(	did32	diskdev,
		ibid32	inum,
		struct lfiblk *	ibuff
	)

Definition at line 10 of file lfibput.c.

References ib2disp, ib2sect, LF_BLKSIZ, OK, read(), SYSERR, and write().

Referenced by lfflush(), lfscreate(), lfsetup(), and lftruncate().

{
    dbid32  diskblock;      /* ID of disk sector (block)    */
    char    *from, *to;     /* Pointers used in copying */
    int32   i;          /* Loop index used during copy  */
    char    dbuff[LF_BLKSIZ];   /* Temp. buffer to hold d-block */

    /* Compute disk block number and offset of index block */

    diskblock = ib2sect(inum);
    to = dbuff + ib2disp(inum);
    from = (char *)ibuff;

    /* Read disk block */

    if (read(diskdev, dbuff, diskblock) == SYSERR) {
        return SYSERR;
    }

    /* Copy index block into place */

    for (i=0 ; i<sizeof(struct lfiblk) ; i++) {
        *to++ = *from++;
    }

    /* Write the block back to disk */

    write(diskdev, dbuff, diskblock);
    return OK;
}

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