WebSVN – HelenOS – Diff – //trunk/uspace/srv/fs/tmpfs/tmpfs_ops.c



{
    unsigned long key = (unsigned long) parentp;
    link_t *hlp = hash_table_find(&childp->names, &key);
    assert(hlp);
    tmpfs_name_t *namep = hash_table_get_instance(hlp, tmpfs_name_t, link);
    return !str_cmp(namep->name, component);
}
 
void *tmpfs_match(void *prnt, const char *component)
{
    tmpfs_dentry_t *parentp = (tmpfs_dentry_t *) prnt;

 
    tmpfs_name_t *namep = malloc(sizeof(tmpfs_name_t));
    if (!namep)
        return ENOMEM;
    tmpfs_name_initialize(namep);
    size_t size = str_size(nm);
    namep->name = malloc(size + 1);
    if (!namep->name) {
        free(namep);
        return ENOMEM;
    }
    strcpy(namep->name, nm);

 
    /*
     * Receive the read request.
     */
    ipc_callid_t callid;
    size_t size;
    if (!ipc_data_read_receive(&callid, &size)) {
        ipc_answer_0(callid, EINVAL);  
        ipc_answer_0(rid, EINVAL);
        return;
    }
 
    size_t bytes;
    if (dentry->type == TMPFS_FILE) {
        bytes = max(0, min(dentry->size - pos, size));
        (void) ipc_data_read_finalize(callid, dentry->data + pos,
            bytes);
    } else {
        int i;
        tmpfs_dentry_t *cur;

        assert(hlp);
        tmpfs_name_t *namep = hash_table_get_instance(hlp, tmpfs_name_t,
            link);
 
        (void) ipc_data_read_finalize(callid, namep->name,
            str_size(namep->name) + 1);
        bytes = 1;
    }
 
    /*
     * Answer the VFS_READ call.

 
    /*
     * Receive the write request.
     */
    ipc_callid_t callid;
    size_t size;
    if (!ipc_data_write_receive(&callid, &size)) {
        ipc_answer_0(callid, EINVAL);  
        ipc_answer_0(rid, EINVAL);
        return;
    }
 
    /*
     * Check whether the file needs to grow.
     */
    if (pos + size <= dentry->size) {
        /* The file size is not changing. */
        (void) ipc_data_write_finalize(callid, dentry->data + pos, size);
        ipc_answer_2(rid, EOK, size, dentry->size);
        return;
    }
    size_t delta = (pos + size) - dentry->size;
    /*
     * At this point, we are deliberately extremely straightforward and
     * simply realloc the contents of the file on every write that grows the
     * file. In the end, the situation might not be as bad as it may look:
     * our heap allocator can save us and just grow the block whenever

    }
    /* Clear any newly allocated memory in order to emulate gaps. */
    memset(newdata + dentry->size, 0, delta);
    dentry->size += delta;
    dentry->data = newdata;
    (void) ipc_data_write_finalize(callid, dentry->data + pos, size);
    ipc_answer_2(rid, EOK, size, dentry->size);
}
 
void tmpfs_truncate(ipc_callid_t rid, ipc_call_t *request)
{
    dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);

Rev 3625	Rev 4264
Line 253...	Line 253...
253	{	253	{
254	unsigned long key = (unsigned long) parentp;	254	unsigned long key = (unsigned long) parentp;
255	link_t *hlp = hash_table_find(&childp->names, &key);	255	link_t *hlp = hash_table_find(&childp->names, &key);
256	assert(hlp);	256	assert(hlp);
257	tmpfs_name_t *namep = hash_table_get_instance(hlp, tmpfs_name_t, link);	257	tmpfs_name_t *namep = hash_table_get_instance(hlp, tmpfs_name_t, link);
258	return !strcmp(namep->name, component);	258	return !str_cmp(namep->name, component);
259	}	259	}
260		260
261	void tmpfs_match(void prnt, const char *component)	261	void tmpfs_match(void prnt, const char *component)
262	{	262	{
263	tmpfs_dentry_t parentp = (tmpfs_dentry_t ) prnt;	263	tmpfs_dentry_t parentp = (tmpfs_dentry_t ) prnt;
Line 317...	Line 317...
317		317
318	tmpfs_name_t *namep = malloc(sizeof(tmpfs_name_t));	318	tmpfs_name_t *namep = malloc(sizeof(tmpfs_name_t));
319	if (!namep)	319	if (!namep)
320	return ENOMEM;	320	return ENOMEM;
321	tmpfs_name_initialize(namep);	321	tmpfs_name_initialize(namep);
322	size_t len = strlen(nm);	322	size_t size = str_size(nm);
323	namep->name = malloc(len + 1);	323	namep->name = malloc(size + 1);
324	if (!namep->name) {	324	if (!namep->name) {
325	free(namep);	325	free(namep);
326	return ENOMEM;	326	return ENOMEM;
327	}	327	}
328	strcpy(namep->name, nm);	328	strcpy(namep->name, nm);
Line 452...	Line 452...
452		452
453	/*	453	/*
454	* Receive the read request.	454	* Receive the read request.
455	*/	455	*/
456	ipc_callid_t callid;	456	ipc_callid_t callid;
457	size_t len;	457	size_t size;
458	if (!ipc_data_read_receive(&callid, &len)) {	458	if (!ipc_data_read_receive(&callid, &size)) {
459	ipc_answer_0(callid, EINVAL);	459	ipc_answer_0(callid, EINVAL);
460	ipc_answer_0(rid, EINVAL);	460	ipc_answer_0(rid, EINVAL);
461	return;	461	return;
462	}	462	}
463		463
464	size_t bytes;	464	size_t bytes;
465	if (dentry->type == TMPFS_FILE) {	465	if (dentry->type == TMPFS_FILE) {
466	bytes = max(0, min(dentry->size - pos, len));	466	bytes = max(0, min(dentry->size - pos, size));
467	(void) ipc_data_read_finalize(callid, dentry->data + pos,	467	(void) ipc_data_read_finalize(callid, dentry->data + pos,
468	bytes);	468	bytes);
469	} else {	469	} else {
470	int i;	470	int i;
471	tmpfs_dentry_t *cur;	471	tmpfs_dentry_t *cur;
Line 492...	Line 492...
492	assert(hlp);	492	assert(hlp);
493	tmpfs_name_t *namep = hash_table_get_instance(hlp, tmpfs_name_t,	493	tmpfs_name_t *namep = hash_table_get_instance(hlp, tmpfs_name_t,
494	link);	494	link);
495		495
496	(void) ipc_data_read_finalize(callid, namep->name,	496	(void) ipc_data_read_finalize(callid, namep->name,
497	strlen(namep->name) + 1);	497	str_size(namep->name) + 1);
498	bytes = 1;	498	bytes = 1;
499	}	499	}
500		500
501	/*	501	/*
502	* Answer the VFS_READ call.	502	* Answer the VFS_READ call.
Line 525...	Line 525...
525		525
526	/*	526	/*
527	* Receive the write request.	527	* Receive the write request.
528	*/	528	*/
529	ipc_callid_t callid;	529	ipc_callid_t callid;
530	size_t len;	530	size_t size;
531	if (!ipc_data_write_receive(&callid, &len)) {	531	if (!ipc_data_write_receive(&callid, &size)) {
532	ipc_answer_0(callid, EINVAL);	532	ipc_answer_0(callid, EINVAL);
533	ipc_answer_0(rid, EINVAL);	533	ipc_answer_0(rid, EINVAL);
534	return;	534	return;
535	}	535	}
536		536
537	/*	537	/*
538	* Check whether the file needs to grow.	538	* Check whether the file needs to grow.
539	*/	539	*/
540	if (pos + len <= dentry->size) {	540	if (pos + size <= dentry->size) {
541	/* The file size is not changing. */	541	/* The file size is not changing. */
542	(void) ipc_data_write_finalize(callid, dentry->data + pos, len);	542	(void) ipc_data_write_finalize(callid, dentry->data + pos, size);
543	ipc_answer_2(rid, EOK, len, dentry->size);	543	ipc_answer_2(rid, EOK, size, dentry->size);
544	return;	544	return;
545	}	545	}
546	size_t delta = (pos + len) - dentry->size;	546	size_t delta = (pos + size) - dentry->size;
547	/*	547	/*
548	* At this point, we are deliberately extremely straightforward and	548	* At this point, we are deliberately extremely straightforward and
549	* simply realloc the contents of the file on every write that grows the	549	* simply realloc the contents of the file on every write that grows the
550	* file. In the end, the situation might not be as bad as it may look:	550	* file. In the end, the situation might not be as bad as it may look:
551	* our heap allocator can save us and just grow the block whenever	551	* our heap allocator can save us and just grow the block whenever
Line 559...	Line 559...
559	}	559	}
560	/* Clear any newly allocated memory in order to emulate gaps. */	560	/* Clear any newly allocated memory in order to emulate gaps. */
561	memset(newdata + dentry->size, 0, delta);	561	memset(newdata + dentry->size, 0, delta);
562	dentry->size += delta;	562	dentry->size += delta;
563	dentry->data = newdata;	563	dentry->data = newdata;
564	(void) ipc_data_write_finalize(callid, dentry->data + pos, len);	564	(void) ipc_data_write_finalize(callid, dentry->data + pos, size);
565	ipc_answer_2(rid, EOK, len, dentry->size);	565	ipc_answer_2(rid, EOK, size, dentry->size);
566	}	566	}
567		567
568	void tmpfs_truncate(ipc_callid_t rid, ipc_call_t *request)	568	void tmpfs_truncate(ipc_callid_t rid, ipc_call_t *request)
569	{	569	{
570	dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);	570	dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);

Subversion Repositories HelenOS

(root)//trunk/uspace/srv/fs/tmpfs/tmpfs_ops.c – Rev 3625 → 4264