lflclose.c File Reference

#include <xinu.h>

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Functions
devcall	lflclose (struct dentry *devptr)

Function Documentation

lflclose()

devcall lflclose

(

struct dentry *

devptr

)

Definition at line 9 of file lflclose.c.

References dentry::dvminor, Lf_data, lfdata::lf_dirdirty, LF_FREE, LF_USED, lflcblk::lfdbdirty, lfflush(), lflcblk::lfibdirty, lfltab, lflcblk::lfmutex, lflcblk::lfstate, OK, signal(), SYSERR, and wait().

{
    struct  lflcblk *lfptr;     /* Ptr to open file table entry */

    /* Obtain exclusive use of the file */

    lfptr = &lfltab[devptr->dvminor];
    wait(lfptr->lfmutex);

    /* If file is not open, return an error */

    if (lfptr->lfstate != LF_USED) {
        signal(lfptr->lfmutex);
        return SYSERR;
    }

    /* Write index or data blocks to disk if they have changed */

    if (Lf_data.lf_dirdirty || lfptr->lfdbdirty || lfptr->lfibdirty) {
        lfflush(lfptr);
    }

    /* Set device state to FREE and return to caller */

    lfptr->lfstate = LF_FREE;
    signal(lfptr->lfmutex);
    return OK;
}

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