[linux-2.6-block.git] / fs / orangefs / dir.c

/*
 * (C) 2001 Clemson University and The University of Chicago
 *
 * See COPYING in top-level directory.
 */

#include "protocol.h"
#include "pvfs2-kernel.h"
#include "pvfs2-bufmap.h"

struct readdir_handle_s {
	int buffer_index;
	struct pvfs2_readdir_response_s readdir_response;
	void *dents_buf;
};

/*
 * decode routine needed by kmod to make sense of the shared page for readdirs.
 */
static long decode_dirents(char *ptr, struct pvfs2_readdir_response_s *readdir)
{
	int i;
	struct pvfs2_readdir_response_s *rd =
		(struct pvfs2_readdir_response_s *) ptr;
	char *buf = ptr;
	char **pptr = &buf;

	readdir->token = rd->token;
	readdir->pvfs_dirent_outcount = rd->pvfs_dirent_outcount;
	readdir->dirent_array = kmalloc(readdir->pvfs_dirent_outcount *
					sizeof(*readdir->dirent_array),
					GFP_KERNEL);
	if (readdir->dirent_array == NULL)
		return -ENOMEM;
	*pptr += offsetof(struct pvfs2_readdir_response_s, dirent_array);
	for (i = 0; i < readdir->pvfs_dirent_outcount; i++) {
		dec_string(pptr, &readdir->dirent_array[i].d_name,
			   &readdir->dirent_array[i].d_length);
		readdir->dirent_array[i].khandle =
			*(struct pvfs2_khandle *) *pptr;
		*pptr += 16;
	}
	return (unsigned long)*pptr - (unsigned long)ptr;
}

static long readdir_handle_ctor(struct readdir_handle_s *rhandle, void *buf,
				int buffer_index)
{
	long ret;

	if (buf == NULL) {
		gossip_err
		    ("Invalid NULL buffer specified in readdir_handle_ctor\n");
		return -ENOMEM;
	}
	if (buffer_index < 0) {
		gossip_err
		    ("Invalid buffer index specified in readdir_handle_ctor\n");
		return -EINVAL;
	}
	rhandle->buffer_index = buffer_index;
	rhandle->dents_buf = buf;
	ret = decode_dirents(buf, &rhandle->readdir_response);
	if (ret < 0) {
		gossip_err("Could not decode readdir from buffer %ld\n", ret);
		rhandle->buffer_index = -1;
		gossip_debug(GOSSIP_DIR_DEBUG, "vfree %p\n", buf);
		vfree(buf);
		rhandle->dents_buf = NULL;
	}
	return ret;
}

static void readdir_handle_dtor(struct pvfs2_bufmap *bufmap,
		struct readdir_handle_s *rhandle)
{
	if (rhandle == NULL)
		return;

	/* kfree(NULL) is safe */
	kfree(rhandle->readdir_response.dirent_array);
	rhandle->readdir_response.dirent_array = NULL;

	if (rhandle->buffer_index >= 0) {
		readdir_index_put(bufmap, rhandle->buffer_index);
		rhandle->buffer_index = -1;
	}
	if (rhandle->dents_buf) {
		gossip_debug(GOSSIP_DIR_DEBUG, "vfree %p\n",
			     rhandle->dents_buf);
		vfree(rhandle->dents_buf);
		rhandle->dents_buf = NULL;
	}
}

/*
 * Read directory entries from an instance of an open directory.
 */
static int pvfs2_readdir(struct file *file, struct dir_context *ctx)
{
	struct pvfs2_bufmap *bufmap = NULL;
	int ret = 0;
	int buffer_index;
	/*
	 * ptoken supports Orangefs' distributed directory logic, added
	 * in 2.9.2.
	 */
	__u64 *ptoken = file->private_data;
	__u64 pos = 0;
	ino_t ino = 0;
	struct dentry *dentry = file->f_path.dentry;
	struct pvfs2_kernel_op_s *new_op = NULL;
	struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(dentry->d_inode);
	int buffer_full = 0;
	struct readdir_handle_s rhandle;
	int i = 0;
	int len = 0;
	ino_t current_ino = 0;
	char *current_entry = NULL;
	long bytes_decoded;

	gossip_debug(GOSSIP_DIR_DEBUG,
		     "%s: ctx->pos:%lld, ptoken = %llu\n",
		     __func__,
		     lld(ctx->pos),
		     llu(*ptoken));

	pos = (__u64) ctx->pos;

	/* are we done? */
	if (pos == PVFS_READDIR_END) {
		gossip_debug(GOSSIP_DIR_DEBUG,
			     "Skipping to termination path\n");
		return 0;
	}

	gossip_debug(GOSSIP_DIR_DEBUG,
		     "pvfs2_readdir called on %s (pos=%llu)\n",
		     dentry->d_name.name, llu(pos));

	rhandle.buffer_index = -1;
	rhandle.dents_buf = NULL;
	memset(&rhandle.readdir_response, 0, sizeof(rhandle.readdir_response));

	new_op = op_alloc(PVFS2_VFS_OP_READDIR);
	if (!new_op)
		return -ENOMEM;

	new_op->uses_shared_memory = 1;
	new_op->upcall.req.readdir.refn = pvfs2_inode->refn;
	new_op->upcall.req.readdir.max_dirent_count = MAX_DIRENT_COUNT_READDIR;

	gossip_debug(GOSSIP_DIR_DEBUG,
		     "%s: upcall.req.readdir.refn.khandle: %pU\n",
		     __func__,
		     &new_op->upcall.req.readdir.refn.khandle);

	new_op->upcall.req.readdir.token = *ptoken;

get_new_buffer_index:
	ret = readdir_index_get(&bufmap, &buffer_index);
	if (ret < 0) {
		gossip_lerr("pvfs2_readdir: readdir_index_get() failure (%d)\n",
			    ret);
		goto out_free_op;
	}
	new_op->upcall.req.readdir.buf_index = buffer_index;

	ret = service_operation(new_op,
				"pvfs2_readdir",
				get_interruptible_flag(dentry->d_inode));

	gossip_debug(GOSSIP_DIR_DEBUG,
		     "Readdir downcall status is %d.  ret:%d\n",
		     new_op->downcall.status,
		     ret);

	if (ret == -EAGAIN && op_state_purged(new_op)) {
		/*
		 * readdir shared memory aread has been wiped due to
		 * pvfs2-client-core restarting, so we must get a new
		 * index into the shared memory.
		 */
		gossip_debug(GOSSIP_DIR_DEBUG,
			"%s: Getting new buffer_index for retry of readdir..\n",
			 __func__);
		readdir_index_put(bufmap, buffer_index);
		goto get_new_buffer_index;
	}

	if (ret == -EIO && op_state_purged(new_op)) {
		gossip_err("%s: Client is down. Aborting readdir call.\n",
			__func__);
		readdir_index_put(bufmap, buffer_index);
		goto out_free_op;
	}

	if (ret < 0 || new_op->downcall.status != 0) {
		gossip_debug(GOSSIP_DIR_DEBUG,
			     "Readdir request failed.  Status:%d\n",
			     new_op->downcall.status);
		readdir_index_put(bufmap, buffer_index);
		if (ret >= 0)
			ret = new_op->downcall.status;
		goto out_free_op;
	}

	bytes_decoded =
		readdir_handle_ctor(&rhandle,
				    new_op->downcall.trailer_buf,
				    buffer_index);
	if (bytes_decoded < 0) {
		gossip_err("pvfs2_readdir: Could not decode trailer buffer into a readdir response %d\n",
			ret);
		ret = bytes_decoded;
		readdir_index_put(bufmap, buffer_index);
		goto out_free_op;
	}

	if (bytes_decoded != new_op->downcall.trailer_size) {
		gossip_err("pvfs2_readdir: # bytes decoded (%ld) "
			   "!= trailer size (%ld)\n",
			   bytes_decoded,
			   (long)new_op->downcall.trailer_size);
		ret = -EINVAL;
		goto out_destroy_handle;
	}

	/*
	 *  pvfs2 doesn't actually store dot and dot-dot, but
	 *  we need to have them represented.
	 */
	if (pos == 0) {
		ino = get_ino_from_khandle(dentry->d_inode);
		gossip_debug(GOSSIP_DIR_DEBUG,
			     "%s: calling dir_emit of \".\" with pos = %llu\n",
			     __func__,
			     llu(pos));
		ret = dir_emit(ctx, ".", 1, ino, DT_DIR);
		pos += 1;
	}

	if (pos == 1) {
		ino = get_parent_ino_from_dentry(dentry);
		gossip_debug(GOSSIP_DIR_DEBUG,
			     "%s: calling dir_emit of \"..\" with pos = %llu\n",
			     __func__,
			     llu(pos));
		ret = dir_emit(ctx, "..", 2, ino, DT_DIR);
		pos += 1;
	}

	/*
	 * we stored PVFS_ITERATE_NEXT in ctx->pos last time around
	 * to prevent "finding" dot and dot-dot on any iteration
	 * other than the first.
	 */
	if (ctx->pos == PVFS_ITERATE_NEXT)
		ctx->pos = 0;

	for (i = ctx->pos;
	     i < rhandle.readdir_response.pvfs_dirent_outcount;
	     i++) {
		len = rhandle.readdir_response.dirent_array[i].d_length;
		current_entry = rhandle.readdir_response.dirent_array[i].d_name;
		current_ino = pvfs2_khandle_to_ino(
			&(rhandle.readdir_response.dirent_array[i].khandle));

		gossip_debug(GOSSIP_DIR_DEBUG,
			     "calling dir_emit for %s with len %d"
			     ", ctx->pos %ld\n",
			     current_entry,
			     len,
			     (unsigned long)ctx->pos);
		/*
		 * type is unknown. We don't return object type
		 * in the dirent_array. This leaves getdents
		 * clueless about type.
		 */
		ret =
		    dir_emit(ctx, current_entry, len, current_ino, DT_UNKNOWN);
		if (!ret)
			break;
		ctx->pos++;
		gossip_debug(GOSSIP_DIR_DEBUG,
			      "%s: ctx->pos:%lld\n",
			      __func__,
			      lld(ctx->pos));

	}

	/* 
	 * we ran all the way through the last batch, set up for
	 * getting another batch...
	 */
	if (ret) {
		*ptoken = rhandle.readdir_response.token;
		ctx->pos = PVFS_ITERATE_NEXT;
	}

	/*
	 * Did we hit the end of the directory?
	 */
	if (rhandle.readdir_response.token == PVFS_READDIR_END &&
	    !buffer_full) {
		gossip_debug(GOSSIP_DIR_DEBUG,
		"End of dir detected; setting ctx->pos to PVFS_READDIR_END.\n");
		ctx->pos = PVFS_READDIR_END;
	}

out_destroy_handle:
	readdir_handle_dtor(bufmap, &rhandle);
out_free_op:
	op_release(new_op);
	gossip_debug(GOSSIP_DIR_DEBUG, "pvfs2_readdir returning %d\n", ret);
	return ret;
}

static int pvfs2_dir_open(struct inode *inode, struct file *file)
{
	__u64 *ptoken;

	file->private_data = kmalloc(sizeof(__u64), GFP_KERNEL);
	if (!file->private_data)
		return -ENOMEM;

	ptoken = file->private_data;
	*ptoken = PVFS_READDIR_START;
	return 0;
}

static int pvfs2_dir_release(struct inode *inode, struct file *file)
{
	pvfs2_flush_inode(inode);
	kfree(file->private_data);
	return 0;
}

/** PVFS2 implementation of VFS directory operations */
const struct file_operations pvfs2_dir_operations = {
	.read = generic_read_dir,
	.iterate = pvfs2_readdir,
	.open = pvfs2_dir_open,
	.release = pvfs2_dir_release,
};
Commit	Line	Data
5db11c21 MM	1	/*
	2	* (C) 2001 Clemson University and The University of Chicago
	3	*
	4	* See COPYING in top-level directory.
	5	*/
	6
	7	#include "protocol.h"
	8	#include "pvfs2-kernel.h"
	9	#include "pvfs2-bufmap.h"
	10
	11	struct readdir_handle_s {
	12	int buffer_index;
	13	struct pvfs2_readdir_response_s readdir_response;
	14	void *dents_buf;
	15	};
	16
	17	/*
	18	* decode routine needed by kmod to make sense of the shared page for readdirs.
	19	*/
	20	static long decode_dirents(char ptr, struct pvfs2_readdir_response_s readdir)
	21	{
	22	int i;
	23	struct pvfs2_readdir_response_s *rd =
	24	(struct pvfs2_readdir_response_s *) ptr;
	25	char *buf = ptr;
	26	char **pptr = &buf;
	27
	28	readdir->token = rd->token;
	29	readdir->pvfs_dirent_outcount = rd->pvfs_dirent_outcount;
	30	readdir->dirent_array = kmalloc(readdir->pvfs_dirent_outcount *
	31	sizeof(*readdir->dirent_array),
	32	GFP_KERNEL);
	33	if (readdir->dirent_array == NULL)
	34	return -ENOMEM;
	35	*pptr += offsetof(struct pvfs2_readdir_response_s, dirent_array);
	36	for (i = 0; i < readdir->pvfs_dirent_outcount; i++) {
	37	dec_string(pptr, &readdir->dirent_array[i].d_name,
	38	&readdir->dirent_array[i].d_length);
	39	readdir->dirent_array[i].khandle =
	40	(struct pvfs2_khandle ) *pptr;
	41	*pptr += 16;
	42	}
	43	return (unsigned long)*pptr - (unsigned long)ptr;
	44	}
	45
	46	static long readdir_handle_ctor(struct readdir_handle_s rhandle, void buf,
	47	int buffer_index)
	48	{
	49	long ret;
	50
	51	if (buf == NULL) {
	52	gossip_err
	53	("Invalid NULL buffer specified in readdir_handle_ctor\n");
	54	return -ENOMEM;
	55	}
	56	if (buffer_index < 0) {
	57	gossip_err
	58	("Invalid buffer index specified in readdir_handle_ctor\n");
	59	return -EINVAL;
	60	}
	61	rhandle->buffer_index = buffer_index;
	62	rhandle->dents_buf = buf;
	63	ret = decode_dirents(buf, &rhandle->readdir_response);
	64	if (ret < 0) {
65	gossip_err("Could not decode readdir from buffer %ld\n", ret);
66	rhandle->buffer_index = -1;
67	gossip_debug(GOSSIP_DIR_DEBUG, "vfree %p\n", buf);
68	vfree(buf);
69	rhandle->dents_buf = NULL;
70	}
71	return ret;
72	}
73
74	static void readdir_handle_dtor(struct pvfs2_bufmap *bufmap,
75	struct readdir_handle_s *rhandle)
76	{
77	if (rhandle == NULL)
78	return;
79
80	/* kfree(NULL) is safe */
81	kfree(rhandle->readdir_response.dirent_array);
82	rhandle->readdir_response.dirent_array = NULL;
83
84	if (rhandle->buffer_index >= 0) {
85	readdir_index_put(bufmap, rhandle->buffer_index);
86	rhandle->buffer_index = -1;
87	}
88	if (rhandle->dents_buf) {
89	gossip_debug(GOSSIP_DIR_DEBUG, "vfree %p\n",
90	rhandle->dents_buf);
91	vfree(rhandle->dents_buf);
92	rhandle->dents_buf = NULL;
93	}
94	}
95
96	/*
97	* Read directory entries from an instance of an open directory.
5db11c21 MM	98	*/
	99	static int pvfs2_readdir(struct file file, struct dir_context ctx)
	100	{
	101	struct pvfs2_bufmap *bufmap = NULL;
	102	int ret = 0;
	103	int buffer_index;
88309aae MM	104	/*
	105	* ptoken supports Orangefs' distributed directory logic, added
	106	* in 2.9.2.
	107	*/
5db11c21 MM	108	__u64 *ptoken = file->private_data;
	109	__u64 pos = 0;
	110	ino_t ino = 0;
	111	struct dentry *dentry = file->f_path.dentry;
	112	struct pvfs2_kernel_op_s *new_op = NULL;
	113	struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(dentry->d_inode);
	114	int buffer_full = 0;
	115	struct readdir_handle_s rhandle;
	116	int i = 0;
	117	int len = 0;
	118	ino_t current_ino = 0;
	119	char *current_entry = NULL;
	120	long bytes_decoded;
	121
88309aae MM	122	gossip_debug(GOSSIP_DIR_DEBUG,
	123	"%s: ctx->pos:%lld, ptoken = %llu\n",
	124	__func__,
	125	lld(ctx->pos),
	126	llu(*ptoken));
5db11c21 MM	127
	128	pos = (__u64) ctx->pos;
	129
	130	/* are we done? */
	131	if (pos == PVFS_READDIR_END) {
	132	gossip_debug(GOSSIP_DIR_DEBUG,
	133	"Skipping to termination path\n");
	134	return 0;
	135	}
	136
	137	gossip_debug(GOSSIP_DIR_DEBUG,
	138	"pvfs2_readdir called on %s (pos=%llu)\n",
	139	dentry->d_name.name, llu(pos));
	140
	141	rhandle.buffer_index = -1;
	142	rhandle.dents_buf = NULL;
	143	memset(&rhandle.readdir_response, 0, sizeof(rhandle.readdir_response));
	144
	145	new_op = op_alloc(PVFS2_VFS_OP_READDIR);
	146	if (!new_op)
	147	return -ENOMEM;
	148
	149	new_op->uses_shared_memory = 1;
	150	new_op->upcall.req.readdir.refn = pvfs2_inode->refn;
	151	new_op->upcall.req.readdir.max_dirent_count = MAX_DIRENT_COUNT_READDIR;
	152
	153	gossip_debug(GOSSIP_DIR_DEBUG,
	154	"%s: upcall.req.readdir.refn.khandle: %pU\n",
	155	__func__,
	156	&new_op->upcall.req.readdir.refn.khandle);
	157
5db11c21 MM	158	new_op->upcall.req.readdir.token = *ptoken;
	159
	160	get_new_buffer_index:
	161	ret = readdir_index_get(&bufmap, &buffer_index);
	162	if (ret < 0) {
	163	gossip_lerr("pvfs2_readdir: readdir_index_get() failure (%d)\n",
	164	ret);
	165	goto out_free_op;
	166	}
	167	new_op->upcall.req.readdir.buf_index = buffer_index;
	168
	169	ret = service_operation(new_op,
	170	"pvfs2_readdir",
	171	get_interruptible_flag(dentry->d_inode));
	172
	173	gossip_debug(GOSSIP_DIR_DEBUG,
	174	"Readdir downcall status is %d. ret:%d\n",
	175	new_op->downcall.status,
	176	ret);
	177
	178	if (ret == -EAGAIN && op_state_purged(new_op)) {
	179	/*
	180	* readdir shared memory aread has been wiped due to
	181	* pvfs2-client-core restarting, so we must get a new
	182	* index into the shared memory.
	183	*/
	184	gossip_debug(GOSSIP_DIR_DEBUG,
	185	"%s: Getting new buffer_index for retry of readdir..\n",
	186	__func__);
	187	readdir_index_put(bufmap, buffer_index);
	188	goto get_new_buffer_index;
	189	}
	190
	191	if (ret == -EIO && op_state_purged(new_op)) {
	192	gossip_err("%s: Client is down. Aborting readdir call.\n",
	193	__func__);
	194	readdir_index_put(bufmap, buffer_index);
	195	goto out_free_op;
	196	}
	197
	198	if (ret < 0 \|\| new_op->downcall.status != 0) {
	199	gossip_debug(GOSSIP_DIR_DEBUG,
	200	"Readdir request failed. Status:%d\n",
	201	new_op->downcall.status);
	202	readdir_index_put(bufmap, buffer_index);
	203	if (ret >= 0)
	204	ret = new_op->downcall.status;
	205	goto out_free_op;
	206	}
	207
	208	bytes_decoded =
	209	readdir_handle_ctor(&rhandle,
	210	new_op->downcall.trailer_buf,
	211	buffer_index);
	212	if (bytes_decoded < 0) {
	213	gossip_err("pvfs2_readdir: Could not decode trailer buffer into a readdir response %d\n",
	214	ret);
	215	ret = bytes_decoded;
	216	readdir_index_put(bufmap, buffer_index);
	217	goto out_free_op;
	218	}
	219
	220	if (bytes_decoded != new_op->downcall.trailer_size) {
88309aae MM	221	gossip_err("pvfs2_readdir: # bytes decoded (%ld) "
	222	"!= trailer size (%ld)\n",
	223	bytes_decoded,
	224	(long)new_op->downcall.trailer_size);
5db11c21 MM	225	ret = -EINVAL;
	226	goto out_destroy_handle;
	227	}
	228
88309aae MM	229	/*
	230	* pvfs2 doesn't actually store dot and dot-dot, but
	231	* we need to have them represented.
	232	*/
5db11c21 MM	233	if (pos == 0) {
	234	ino = get_ino_from_khandle(dentry->d_inode);
	235	gossip_debug(GOSSIP_DIR_DEBUG,
	236	"%s: calling dir_emit of \".\" with pos = %llu\n",
	237	__func__,
	238	llu(pos));
	239	ret = dir_emit(ctx, ".", 1, ino, DT_DIR);
88309aae	240	pos += 1;
5db11c21 MM	241	}
	242
	243	if (pos == 1) {
	244	ino = get_parent_ino_from_dentry(dentry);
	245	gossip_debug(GOSSIP_DIR_DEBUG,
	246	"%s: calling dir_emit of \"..\" with pos = %llu\n",
	247	__func__,
	248	llu(pos));
	249	ret = dir_emit(ctx, "..", 2, ino, DT_DIR);
88309aae	250	pos += 1;
5db11c21 MM	251	}
5db11c21 MM	252
88309aae MM	253	/*
	254	* we stored PVFS_ITERATE_NEXT in ctx->pos last time around
	255	* to prevent "finding" dot and dot-dot on any iteration
	256	* other than the first.
	257	*/
	258	if (ctx->pos == PVFS_ITERATE_NEXT)
	259	ctx->pos = 0;
	260
	261	for (i = ctx->pos;
	262	i < rhandle.readdir_response.pvfs_dirent_outcount;
	263	i++) {
5db11c21 MM	264	len = rhandle.readdir_response.dirent_array[i].d_length;
	265	current_entry = rhandle.readdir_response.dirent_array[i].d_name;
	266	current_ino = pvfs2_khandle_to_ino(
	267	&(rhandle.readdir_response.dirent_array[i].khandle));
	268
	269	gossip_debug(GOSSIP_DIR_DEBUG,
88309aae MM	270	"calling dir_emit for %s with len %d"
88309aae MM	271	", ctx->pos %ld\n",
5db11c21 MM	272	current_entry,
5db11c21 MM	273	len,
88309aae MM	274	(unsigned long)ctx->pos);
	275	/*
	276	* type is unknown. We don't return object type
	277	* in the dirent_array. This leaves getdents
	278	* clueless about type.
	279	*/
5db11c21 MM	280	ret =
5db11c21 MM	281	dir_emit(ctx, current_entry, len, current_ino, DT_UNKNOWN);
88309aae MM	282	if (!ret)
88309aae MM	283	break;
5db11c21	284	ctx->pos++;
88309aae	285	gossip_debug(GOSSIP_DIR_DEBUG,
5db11c21 MM	286	"%s: ctx->pos:%lld\n",
	287	__func__,
	288	lld(ctx->pos));
	289
5db11c21 MM	290	}
5db11c21 MM	291
88309aae MM	292	/*
	293	* we ran all the way through the last batch, set up for
	294	* getting another batch...
	295	*/
	296	if (ret) {
5db11c21	297	*ptoken = rhandle.readdir_response.token;
88309aae	298	ctx->pos = PVFS_ITERATE_NEXT;
5db11c21 MM	299	}
	300
	301	/*
	302	* Did we hit the end of the directory?
	303	*/
	304	if (rhandle.readdir_response.token == PVFS_READDIR_END &&
	305	!buffer_full) {
88309aae MM	306	gossip_debug(GOSSIP_DIR_DEBUG,
88309aae MM	307	"End of dir detected; setting ctx->pos to PVFS_READDIR_END.\n");
5db11c21 MM	308	ctx->pos = PVFS_READDIR_END;
	309	}
	310
5db11c21 MM	311	out_destroy_handle:
	312	readdir_handle_dtor(bufmap, &rhandle);
	313	out_free_op:
	314	op_release(new_op);
	315	gossip_debug(GOSSIP_DIR_DEBUG, "pvfs2_readdir returning %d\n", ret);
	316	return ret;
	317	}
	318
	319	static int pvfs2_dir_open(struct inode inode, struct file file)
	320	{
	321	__u64 *ptoken;
	322
	323	file->private_data = kmalloc(sizeof(__u64), GFP_KERNEL);
	324	if (!file->private_data)
	325	return -ENOMEM;
	326
	327	ptoken = file->private_data;
	328	*ptoken = PVFS_READDIR_START;
	329	return 0;
	330	}
	331
	332	static int pvfs2_dir_release(struct inode inode, struct file file)
	333	{
	334	pvfs2_flush_inode(inode);
	335	kfree(file->private_data);
	336	return 0;
	337	}
	338
	339	/** PVFS2 implementation of VFS directory operations */
	340	const struct file_operations pvfs2_dir_operations = {
	341	.read = generic_read_dir,
	342	.iterate = pvfs2_readdir,
	343	.open = pvfs2_dir_open,
	344	.release = pvfs2_dir_release,
	345	};