1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
|
/*
* (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, size_t size,
struct pvfs2_readdir_response_s *readdir)
{
int i;
struct pvfs2_readdir_response_s *rd =
(struct pvfs2_readdir_response_s *) ptr;
char *buf = ptr;
if (size < offsetof(struct pvfs2_readdir_response_s, dirent_array))
return -EINVAL;
readdir->token = rd->token;
readdir->pvfs_dirent_outcount = rd->pvfs_dirent_outcount;
readdir->dirent_array = kcalloc(readdir->pvfs_dirent_outcount,
sizeof(*readdir->dirent_array),
GFP_KERNEL);
if (readdir->dirent_array == NULL)
return -ENOMEM;
buf += offsetof(struct pvfs2_readdir_response_s, dirent_array);
size -= offsetof(struct pvfs2_readdir_response_s, dirent_array);
for (i = 0; i < readdir->pvfs_dirent_outcount; i++) {
__u32 len;
if (size < 4)
goto Einval;
len = *(__u32 *)buf;
if (len >= (unsigned)-24)
goto Einval;
readdir->dirent_array[i].d_name = buf + 4;
readdir->dirent_array[i].d_length = len;
len = roundup8(4 + len + 1);
if (size < len + 16)
goto Einval;
size -= len + 16;
buf += len;
readdir->dirent_array[i].khandle =
*(struct pvfs2_khandle *) buf;
buf += 16;
}
return buf - ptr;
Einval:
kfree(readdir->dirent_array);
readdir->dirent_array = NULL;
return -EINVAL;
}
static long readdir_handle_ctor(struct readdir_handle_s *rhandle, void *buf,
size_t size, 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, size, &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,
new_op->downcall.trailer_size,
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,
};
|