WebSVN – HelenOS – Diff – //branches/dynload/uspace/srv/fs/fat/fat_ops.c



    bps = uint16_t_le2host(bs->bps);
    dps = bps / sizeof(fat_dentry_t);
   
    /* Read the block that contains the dentry of interest. */
    b = _fat_block_get(bs, node->idx->dev_handle, node->idx->pfc,
        (node->idx->pdi * sizeof(fat_dentry_t)) / bps, BLOCK_FLAGS_NONE);
 
    d = ((fat_dentry_t *)b->data) + (node->idx->pdi % dps);
 
    d->firstc = host2uint16_t_le(node->firstc);
    if (node->type == FAT_FILE)

    spc = bs->spc;
    dps = bps / sizeof(fat_dentry_t);
 
    /* Read the block that contains the dentry of interest. */
    b = _fat_block_get(bs, idxp->dev_handle, idxp->pfc,
        (idxp->pdi * sizeof(fat_dentry_t)) / bps, BLOCK_FLAGS_NONE);
    assert(b);
 
    d = ((fat_dentry_t *)b->data) + (idxp->pdi % dps);
    if (d->attr & FAT_ATTR_SUBDIR) {
        /*

    bs = block_bb_get(parentp->idx->dev_handle);
    bps = uint16_t_le2host(bs->bps);
    dps = bps / sizeof(fat_dentry_t);
    blocks = parentp->size / bps;
    for (i = 0; i < blocks; i++) {
        b = fat_block_get(bs, parentp, i, BLOCK_FLAGS_NONE);
        for (j = 0; j < dps; j++) {
            d = ((fat_dentry_t *)b->data) + j;
            switch (fat_classify_dentry(d)) {
            case FAT_DENTRY_SKIP:
                continue;

    blocks = nodep->size / bps;
 
    for (i = 0; i < blocks; i++) {
        fat_dentry_t *d;
   
        b = fat_block_get(bs, nodep, i, BLOCK_FLAGS_NONE);
        for (j = 0; j < dps; j++) {
            d = ((fat_dentry_t *)b->data) + j;
            switch (fat_classify_dentry(d)) {
            case FAT_DENTRY_SKIP:
                continue;

            bytes = 0;
            (void) ipc_data_read_finalize(callid, NULL, 0);
        } else {
            bytes = min(len, bps - pos % bps);
            bytes = min(bytes, nodep->size - pos);
            b = fat_block_get(bs, nodep, pos / bps,
                BLOCK_FLAGS_NONE);
            (void) ipc_data_read_finalize(callid, b->data + pos % bps,
                bytes);
            block_put(b);
        }
    } else {

         */
        bnum = (pos * sizeof(fat_dentry_t)) / bps;
        while (bnum < nodep->size / bps) {
            off_t o;
 
            b = fat_block_get(bs, nodep, bnum, BLOCK_FLAGS_NONE);
            for (o = pos % (bps / sizeof(fat_dentry_t));
                o < bps / sizeof(fat_dentry_t);
                o++, pos++) {
                d = ((fat_dentry_t *)b->data) + o;
                switch (fat_classify_dentry(d)) {

    block_t *b;
    uint16_t bps;
    unsigned spc;
    unsigned bpc;       /* bytes per cluster */
    off_t boundary;
    int flags = BLOCK_FLAGS_NONE;
   
    if (!nodep) {
        ipc_answer_0(rid, ENOENT);
        return;
    }

     * but this one greatly simplifies fat_write(). Note that we can afford
     * to do this because the client must be ready to handle the return
     * value signalizing a smaller number of bytes written.
     */
    bytes = min(len, bps - pos % bps);
    if (bytes == bps)
        flags |= BLOCK_FLAGS_NOREAD;
   
    boundary = ROUND_UP(nodep->size, bpc);
    if (pos < boundary) {
        /*
         * This is the easier case - we are either overwriting already
         * existing contents or writing behind the EOF, but still within
         * the limits of the last cluster. The node size may grow to the
         * next block size boundary.
         */
        fat_fill_gap(bs, nodep, FAT_CLST_RES0, pos);
        b = fat_block_get(bs, nodep, pos / bps, flags);
        (void) ipc_data_write_finalize(callid, b->data + pos % bps,
            bytes);
        b->dirty = true;        /* need to sync block */
        block_put(b);
        if (pos + bytes > nodep->size) {

            ipc_answer_0(rid, status);
            return;
        }
        /* zero fill any gaps */
        fat_fill_gap(bs, nodep, mcl, pos);
        b = _fat_block_get(bs, dev_handle, lcl, (pos / bps) % spc,
            flags);
        (void) ipc_data_write_finalize(callid, b->data + pos % bps,
            bytes);
        b->dirty = true;        /* need to sync block */
        block_put(b);
        /*

Rev 3588	Rev 3598
Line 87...	Line 87...
87	bps = uint16_t_le2host(bs->bps);	87	bps = uint16_t_le2host(bs->bps);
88	dps = bps / sizeof(fat_dentry_t);	88	dps = bps / sizeof(fat_dentry_t);
89		89
90	/* Read the block that contains the dentry of interest. */	90	/* Read the block that contains the dentry of interest. */
91	b = _fat_block_get(bs, node->idx->dev_handle, node->idx->pfc,	91	b = _fat_block_get(bs, node->idx->dev_handle, node->idx->pfc,
92	(node->idx->pdi * sizeof(fat_dentry_t)) / bps);	92	(node->idx->pdi * sizeof(fat_dentry_t)) / bps, BLOCK_FLAGS_NONE);
93		93
94	d = ((fat_dentry_t *)b->data) + (node->idx->pdi % dps);	94	d = ((fat_dentry_t *)b->data) + (node->idx->pdi % dps);
95		95
96	d->firstc = host2uint16_t_le(node->firstc);	96	d->firstc = host2uint16_t_le(node->firstc);
97	if (node->type == FAT_FILE)	97	if (node->type == FAT_FILE)
Line 179...	Line 179...
179	spc = bs->spc;	179	spc = bs->spc;
180	dps = bps / sizeof(fat_dentry_t);	180	dps = bps / sizeof(fat_dentry_t);
181		181
182	/* Read the block that contains the dentry of interest. */	182	/* Read the block that contains the dentry of interest. */
183	b = _fat_block_get(bs, idxp->dev_handle, idxp->pfc,	183	b = _fat_block_get(bs, idxp->dev_handle, idxp->pfc,
184	(idxp->pdi * sizeof(fat_dentry_t)) / bps);	184	(idxp->pdi * sizeof(fat_dentry_t)) / bps, BLOCK_FLAGS_NONE);
185	assert(b);	185	assert(b);
186		186
187	d = ((fat_dentry_t *)b->data) + (idxp->pdi % dps);	187	d = ((fat_dentry_t *)b->data) + (idxp->pdi % dps);
188	if (d->attr & FAT_ATTR_SUBDIR) {	188	if (d->attr & FAT_ATTR_SUBDIR) {
189	/*	189	/*
Line 280...	Line 280...
280	bs = block_bb_get(parentp->idx->dev_handle);	280	bs = block_bb_get(parentp->idx->dev_handle);
281	bps = uint16_t_le2host(bs->bps);	281	bps = uint16_t_le2host(bs->bps);
282	dps = bps / sizeof(fat_dentry_t);	282	dps = bps / sizeof(fat_dentry_t);
283	blocks = parentp->size / bps;	283	blocks = parentp->size / bps;
284	for (i = 0; i < blocks; i++) {	284	for (i = 0; i < blocks; i++) {
285	b = fat_block_get(bs, parentp, i);	285	b = fat_block_get(bs, parentp, i, BLOCK_FLAGS_NONE);
286	for (j = 0; j < dps; j++) {	286	for (j = 0; j < dps; j++) {
287	d = ((fat_dentry_t *)b->data) + j;	287	d = ((fat_dentry_t *)b->data) + j;
288	switch (fat_classify_dentry(d)) {	288	switch (fat_classify_dentry(d)) {
289	case FAT_DENTRY_SKIP:	289	case FAT_DENTRY_SKIP:
290	continue;	290	continue;
Line 370...	Line 370...
370	blocks = nodep->size / bps;	370	blocks = nodep->size / bps;
371		371
372	for (i = 0; i < blocks; i++) {	372	for (i = 0; i < blocks; i++) {
373	fat_dentry_t *d;	373	fat_dentry_t *d;
374		374
375	b = fat_block_get(bs, nodep, i);	375	b = fat_block_get(bs, nodep, i, BLOCK_FLAGS_NONE);
376	for (j = 0; j < dps; j++) {	376	for (j = 0; j < dps; j++) {
377	d = ((fat_dentry_t *)b->data) + j;	377	d = ((fat_dentry_t *)b->data) + j;
378	switch (fat_classify_dentry(d)) {	378	switch (fat_classify_dentry(d)) {
379	case FAT_DENTRY_SKIP:	379	case FAT_DENTRY_SKIP:
380	continue;	380	continue;
Line 572...	Line 572...
572	bytes = 0;	572	bytes = 0;
573	(void) ipc_data_read_finalize(callid, NULL, 0);	573	(void) ipc_data_read_finalize(callid, NULL, 0);
574	} else {	574	} else {
575	bytes = min(len, bps - pos % bps);	575	bytes = min(len, bps - pos % bps);
576	bytes = min(bytes, nodep->size - pos);	576	bytes = min(bytes, nodep->size - pos);
577	b = fat_block_get(bs, nodep, pos / bps);	577	b = fat_block_get(bs, nodep, pos / bps,
-		578	BLOCK_FLAGS_NONE);
578	(void) ipc_data_read_finalize(callid, b->data + pos % bps,	579	(void) ipc_data_read_finalize(callid, b->data + pos % bps,
579	bytes);	580	bytes);
580	block_put(b);	581	block_put(b);
581	}	582	}
582	} else {	583	} else {
Line 597...	Line 598...
597	*/	598	*/
598	bnum = (pos * sizeof(fat_dentry_t)) / bps;	599	bnum = (pos * sizeof(fat_dentry_t)) / bps;
599	while (bnum < nodep->size / bps) {	600	while (bnum < nodep->size / bps) {
600	off_t o;	601	off_t o;
601		602
602	b = fat_block_get(bs, nodep, bnum);	603	b = fat_block_get(bs, nodep, bnum, BLOCK_FLAGS_NONE);
603	for (o = pos % (bps / sizeof(fat_dentry_t));	604	for (o = pos % (bps / sizeof(fat_dentry_t));
604	o < bps / sizeof(fat_dentry_t);	605	o < bps / sizeof(fat_dentry_t);
605	o++, pos++) {	606	o++, pos++) {
606	d = ((fat_dentry_t *)b->data) + o;	607	d = ((fat_dentry_t *)b->data) + o;
607	switch (fat_classify_dentry(d)) {	608	switch (fat_classify_dentry(d)) {
Line 645...	Line 646...
645	block_t *b;	646	block_t *b;
646	uint16_t bps;	647	uint16_t bps;
647	unsigned spc;	648	unsigned spc;
648	unsigned bpc; /* bytes per cluster */	649	unsigned bpc; /* bytes per cluster */
649	off_t boundary;	650	off_t boundary;
-		651	int flags = BLOCK_FLAGS_NONE;
650		652
651	if (!nodep) {	653	if (!nodep) {
652	ipc_answer_0(rid, ENOENT);	654	ipc_answer_0(rid, ENOENT);
653	return;	655	return;
654	}	656	}
Line 673...	Line 675...
673	* but this one greatly simplifies fat_write(). Note that we can afford	675	* but this one greatly simplifies fat_write(). Note that we can afford
674	* to do this because the client must be ready to handle the return	676	* to do this because the client must be ready to handle the return
675	* value signalizing a smaller number of bytes written.	677	* value signalizing a smaller number of bytes written.
676	*/	678	*/
677	bytes = min(len, bps - pos % bps);	679	bytes = min(len, bps - pos % bps);
-		680	if (bytes == bps)
-		681	flags \|= BLOCK_FLAGS_NOREAD;
678		682
679	boundary = ROUND_UP(nodep->size, bpc);	683	boundary = ROUND_UP(nodep->size, bpc);
680	if (pos < boundary) {	684	if (pos < boundary) {
681	/*	685	/*
682	* This is the easier case - we are either overwriting already	686	* This is the easier case - we are either overwriting already
683	* existing contents or writing behind the EOF, but still within	687	* existing contents or writing behind the EOF, but still within
684	* the limits of the last cluster. The node size may grow to the	688	* the limits of the last cluster. The node size may grow to the
685	* next block size boundary.	689	* next block size boundary.
686	*/	690	*/
687	fat_fill_gap(bs, nodep, FAT_CLST_RES0, pos);	691	fat_fill_gap(bs, nodep, FAT_CLST_RES0, pos);
688	b = fat_block_get(bs, nodep, pos / bps);	692	b = fat_block_get(bs, nodep, pos / bps, flags);
689	(void) ipc_data_write_finalize(callid, b->data + pos % bps,	693	(void) ipc_data_write_finalize(callid, b->data + pos % bps,
690	bytes);	694	bytes);
691	b->dirty = true; /* need to sync block */	695	b->dirty = true; /* need to sync block */
692	block_put(b);	696	block_put(b);
693	if (pos + bytes > nodep->size) {	697	if (pos + bytes > nodep->size) {
Line 716...	Line 720...
716	ipc_answer_0(rid, status);	720	ipc_answer_0(rid, status);
717	return;	721	return;
718	}	722	}
719	/* zero fill any gaps */	723	/* zero fill any gaps */
720	fat_fill_gap(bs, nodep, mcl, pos);	724	fat_fill_gap(bs, nodep, mcl, pos);
721	b = _fat_block_get(bs, dev_handle, lcl, (pos / bps) % spc);	725	b = _fat_block_get(bs, dev_handle, lcl, (pos / bps) % spc,
-		726	flags);
722	(void) ipc_data_write_finalize(callid, b->data + pos % bps,	727	(void) ipc_data_write_finalize(callid, b->data + pos % bps,
723	bytes);	728	bytes);
724	b->dirty = true; /* need to sync block */	729	b->dirty = true; /* need to sync block */
725	block_put(b);	730	block_put(b);
726	/*	731	/*

Subversion Repositories HelenOS

(root)//branches/dynload/uspace/srv/fs/fat/fat_ops.c – Rev 3588 → 3598