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Rev 3598 Rev 3674
Line 180... Line 180...
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    spc = bs->spc;
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    spc = bs->spc;
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    boundary = ROUND_UP(nodep->size, bps * spc);
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    boundary = ROUND_UP(nodep->size, bps * spc);
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    /* zero out already allocated space */
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    /* zero out already allocated space */
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    for (o = nodep->size - 1; o < pos && o < boundary;
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    for (o = nodep->size; o < pos && o < boundary;
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        o = ALIGN_DOWN(o + bps, bps)) {
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        o = ALIGN_DOWN(o + bps, bps)) {
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            int flags = (o % bps == 0) ?
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            int flags = (o % bps == 0) ?
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            BLOCK_FLAGS_NOREAD : BLOCK_FLAGS_NONE;
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            BLOCK_FLAGS_NOREAD : BLOCK_FLAGS_NONE;
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        b = fat_block_get(bs, nodep, o / bps, flags);
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        b = fat_block_get(bs, nodep, o / bps, flags);
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        memset(b->data + o % bps, 0, bps - o % bps);
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        memset(b->data + o % bps, 0, bps - o % bps);
Line 283... Line 283...
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                c == 0 ? FAT_CLST_LAST1 : lifo[c - 1]);
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                c == 0 ? FAT_CLST_LAST1 : lifo[c - 1]);
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        }
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        }
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    }
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    }
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}
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}
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/** Allocate clusters in FAT1.
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/** Allocate clusters in all copies of FAT.
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 *
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 *
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 * This function will attempt to allocate the requested number of clusters in
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 * This function will attempt to allocate the requested number of clusters in
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 * the first FAT instance.  The FAT will be altered so that the allocated
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 * all instances of the FAT.  The FAT will be altered so that the allocated
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 * clusters form an independent chain (i.e. a chain which does not belong to any
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 * clusters form an independent chain (i.e. a chain which does not belong to any
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 * file yet).
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 * file yet).
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 *
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 *
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 * @param bs        Buffer holding the boot sector of the file system.
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 * @param bs        Buffer holding the boot sector of the file system.
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 * @param dev_handle    Device handle of the file system.
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 * @param dev_handle    Device handle of the file system.
Line 313... Line 313...
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    fat_cluster_t *lifo;    /* stack for storing free cluster numbers */
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    fat_cluster_t *lifo;    /* stack for storing free cluster numbers */
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    unsigned found = 0; /* top of the free cluster number stack */
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    unsigned found = 0; /* top of the free cluster number stack */
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    unsigned b, c, cl;
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    unsigned b, c, cl;
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    lifo = (fat_cluster_t *) malloc(nclsts * sizeof(fat_cluster_t));
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    lifo = (fat_cluster_t *) malloc(nclsts * sizeof(fat_cluster_t));
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    if (lifo)
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    if (!lifo)
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        return ENOMEM;
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        return ENOMEM;
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    bps = uint16_t_le2host(bs->bps);
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    bps = uint16_t_le2host(bs->bps);
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    rscnt = uint16_t_le2host(bs->rscnt);
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    rscnt = uint16_t_le2host(bs->rscnt);
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    sf = uint16_t_le2host(bs->sec_per_fat);
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    sf = uint16_t_le2host(bs->sec_per_fat);
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    /*
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    /*
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     * Search FAT1 for unused clusters.
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     * Search FAT1 for unused clusters.
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     */
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     */
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    futex_down(&fat_alloc_lock);
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    futex_down(&fat_alloc_lock);
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    for (b = 0, cl = 0; b < sf; blk++) {
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    for (b = 0, cl = 0; b < sf; b++) {
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        blk = block_get(dev_handle, rscnt + b, BLOCK_FLAGS_NOREAD);
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        blk = block_get(dev_handle, rscnt + b, BLOCK_FLAGS_NONE);
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        for (c = 0; c < bps / sizeof(fat_cluster_t); c++, cl++) {
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        for (c = 0; c < bps / sizeof(fat_cluster_t); c++, cl++) {
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            fat_cluster_t *clst = (fat_cluster_t *)blk->data + c;
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            fat_cluster_t *clst = (fat_cluster_t *)blk->data + c;
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            if (uint16_t_le2host(*clst) == FAT_CLST_RES0) {
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            if (uint16_t_le2host(*clst) == FAT_CLST_RES0) {
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                /*
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                /*
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                 * The cluster is free. Put it into our stack
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                 * The cluster is free. Put it into our stack
Line 383... Line 383...
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    unsigned fatno;
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    unsigned fatno;
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    fat_cluster_t nextc;
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    fat_cluster_t nextc;
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    /* Mark all clusters in the chain as free in all copies of FAT. */
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    /* Mark all clusters in the chain as free in all copies of FAT. */
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    while (firstc < FAT_CLST_LAST1) {
387
    while (firstc < FAT_CLST_LAST1) {
-
 
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        assert(firstc >= FAT_CLST_FIRST && firstc < FAT_CLST_BAD);
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        nextc = fat_get_cluster(bs, dev_handle, firstc);
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        nextc = fat_get_cluster(bs, dev_handle, firstc);
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        assert(nextc >= FAT_CLST_FIRST && nextc < FAT_CLST_BAD);
-
 
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        for (fatno = FAT1; fatno < bs->fatcnt; fatno++)
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        for (fatno = FAT1; fatno < bs->fatcnt; fatno++)
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            fat_set_cluster(bs, dev_handle, fatno, firstc,
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            fat_set_cluster(bs, dev_handle, fatno, firstc,
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                FAT_CLST_RES0);
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                FAT_CLST_RES0);
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        firstc = nextc;
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        firstc = nextc;
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    }
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    }
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    uint8_t fatno;
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    uint8_t fatno;
408
 
408
 
409
    if (fat_cluster_walk(bs, dev_handle, nodep->firstc, &lcl,
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    if (fat_cluster_walk(bs, dev_handle, nodep->firstc, &lcl,
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        (uint16_t) -1) == 0) {
410
        (uint16_t) -1) == 0) {
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        /* No clusters allocated to the node yet. */
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        /* No clusters allocated to the node yet. */
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        nodep->firstc = host2uint16_t_le(mcl);
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        nodep->firstc = mcl;
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        nodep->dirty = true;        /* need to sync node */
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        nodep->dirty = true;        /* need to sync node */
414
        return;
414
        return;
415
    }
415
    }
416
 
416
 
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    for (fatno = FAT1; fatno < bs->fatcnt; fatno++)
417
    for (fatno = FAT1; fatno < bs->fatcnt; fatno++)