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" | |
575e9461 MM |
8 | #include "orangefs-kernel.h" |
9 | #include "orangefs-bufmap.h" | |
5db11c21 | 10 | |
5db11c21 | 11 | /* |
1808f8cc MM |
12 | * decode routine used by kmod to deal with the blob sent from |
13 | * userspace for readdirs. The blob contains zero or more of these | |
14 | * sub-blobs: | |
15 | * __u32 - represents length of the character string that follows. | |
16 | * string - between 1 and ORANGEFS_NAME_MAX bytes long. | |
17 | * padding - (if needed) to cause the __u32 plus the string to be | |
18 | * eight byte aligned. | |
19 | * khandle - sizeof(khandle) bytes. | |
5db11c21 | 20 | */ |
8092895f | 21 | static long decode_dirents(char *ptr, size_t size, |
8bb8aefd | 22 | struct orangefs_readdir_response_s *readdir) |
5db11c21 MM |
23 | { |
24 | int i; | |
8bb8aefd YL |
25 | struct orangefs_readdir_response_s *rd = |
26 | (struct orangefs_readdir_response_s *) ptr; | |
5db11c21 | 27 | char *buf = ptr; |
1808f8cc MM |
28 | int khandle_size = sizeof(struct orangefs_khandle); |
29 | size_t offset = offsetof(struct orangefs_readdir_response_s, | |
30 | dirent_array); | |
31 | /* 8 reflects eight byte alignment */ | |
32 | int smallest_blob = khandle_size + 8; | |
33 | __u32 len; | |
34 | int aligned_len; | |
35 | int sizeof_u32 = sizeof(__u32); | |
36 | long ret; | |
5db11c21 | 37 | |
1808f8cc MM |
38 | gossip_debug(GOSSIP_DIR_DEBUG, "%s: size:%zu:\n", __func__, size); |
39 | ||
40 | /* size is = offset on empty dirs, > offset on non-empty dirs... */ | |
41 | if (size < offset) { | |
42 | gossip_err("%s: size:%zu: offset:%zu:\n", | |
43 | __func__, | |
44 | size, | |
45 | offset); | |
46 | ret = -EINVAL; | |
47 | goto out; | |
48 | } | |
49 | ||
50 | if ((size == offset) && (readdir->orangefs_dirent_outcount != 0)) { | |
51 | gossip_err("%s: size:%zu: dirent_outcount:%d:\n", | |
52 | __func__, | |
53 | size, | |
54 | readdir->orangefs_dirent_outcount); | |
55 | ret = -EINVAL; | |
56 | goto out; | |
57 | } | |
8092895f | 58 | |
5db11c21 | 59 | readdir->token = rd->token; |
8bb8aefd YL |
60 | readdir->orangefs_dirent_outcount = rd->orangefs_dirent_outcount; |
61 | readdir->dirent_array = kcalloc(readdir->orangefs_dirent_outcount, | |
5db11c21 MM |
62 | sizeof(*readdir->dirent_array), |
63 | GFP_KERNEL); | |
1808f8cc MM |
64 | if (readdir->dirent_array == NULL) { |
65 | gossip_err("%s: kcalloc failed.\n", __func__); | |
66 | ret = -ENOMEM; | |
67 | goto out; | |
68 | } | |
8092895f | 69 | |
1808f8cc MM |
70 | buf += offset; |
71 | size -= offset; | |
8092895f | 72 | |
8bb8aefd | 73 | for (i = 0; i < readdir->orangefs_dirent_outcount; i++) { |
1808f8cc MM |
74 | if (size < smallest_blob) { |
75 | gossip_err("%s: size:%zu: smallest_blob:%d:\n", | |
76 | __func__, | |
77 | size, | |
78 | smallest_blob); | |
79 | ret = -EINVAL; | |
80 | goto free; | |
81 | } | |
8092895f AV |
82 | |
83 | len = *(__u32 *)buf; | |
1808f8cc MM |
84 | if ((len < 1) || (len > ORANGEFS_NAME_MAX)) { |
85 | gossip_err("%s: len:%d:\n", __func__, len); | |
86 | ret = -EINVAL; | |
87 | goto free; | |
88 | } | |
89 | ||
90 | gossip_debug(GOSSIP_DIR_DEBUG, | |
91 | "%s: size:%zu: len:%d:\n", | |
92 | __func__, | |
93 | size, | |
94 | len); | |
95 | ||
96 | readdir->dirent_array[i].d_name = buf + sizeof_u32; | |
9be68b08 | 97 | readdir->dirent_array[i].d_length = len; |
8092895f | 98 | |
7d221485 | 99 | /* |
1808f8cc MM |
100 | * Calculate "aligned" length of this string and its |
101 | * associated __u32 descriptor. | |
102 | */ | |
103 | aligned_len = ((sizeof_u32 + len + 1) + 7) & ~7; | |
104 | gossip_debug(GOSSIP_DIR_DEBUG, | |
105 | "%s: aligned_len:%d:\n", | |
106 | __func__, | |
107 | aligned_len); | |
108 | ||
109 | /* | |
110 | * The end of the blob should coincide with the end | |
111 | * of the last sub-blob. | |
7d221485 | 112 | */ |
1808f8cc MM |
113 | if (size < aligned_len + khandle_size) { |
114 | gossip_err("%s: ran off the end of the blob.\n", | |
115 | __func__); | |
116 | ret = -EINVAL; | |
117 | goto free; | |
118 | } | |
119 | size -= aligned_len + khandle_size; | |
8092895f | 120 | |
1808f8cc | 121 | buf += aligned_len; |
8092895f | 122 | |
5db11c21 | 123 | readdir->dirent_array[i].khandle = |
8bb8aefd | 124 | *(struct orangefs_khandle *) buf; |
1808f8cc | 125 | buf += khandle_size; |
5db11c21 | 126 | } |
1808f8cc MM |
127 | ret = buf - ptr; |
128 | gossip_debug(GOSSIP_DIR_DEBUG, "%s: returning:%ld:\n", __func__, ret); | |
129 | goto out; | |
130 | ||
131 | free: | |
8092895f AV |
132 | kfree(readdir->dirent_array); |
133 | readdir->dirent_array = NULL; | |
1808f8cc MM |
134 | |
135 | out: | |
136 | return ret; | |
5db11c21 MM |
137 | } |
138 | ||
5db11c21 MM |
139 | /* |
140 | * Read directory entries from an instance of an open directory. | |
5db11c21 | 141 | */ |
8bb8aefd | 142 | static int orangefs_readdir(struct file *file, struct dir_context *ctx) |
5db11c21 | 143 | { |
5db11c21 MM |
144 | int ret = 0; |
145 | int buffer_index; | |
88309aae MM |
146 | /* |
147 | * ptoken supports Orangefs' distributed directory logic, added | |
148 | * in 2.9.2. | |
149 | */ | |
5db11c21 MM |
150 | __u64 *ptoken = file->private_data; |
151 | __u64 pos = 0; | |
152 | ino_t ino = 0; | |
153 | struct dentry *dentry = file->f_path.dentry; | |
8bb8aefd YL |
154 | struct orangefs_kernel_op_s *new_op = NULL; |
155 | struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(dentry->d_inode); | |
9f5e2f7f AV |
156 | struct orangefs_readdir_response_s readdir_response; |
157 | void *dents_buf; | |
5db11c21 MM |
158 | int i = 0; |
159 | int len = 0; | |
160 | ino_t current_ino = 0; | |
161 | char *current_entry = NULL; | |
162 | long bytes_decoded; | |
163 | ||
88309aae MM |
164 | gossip_debug(GOSSIP_DIR_DEBUG, |
165 | "%s: ctx->pos:%lld, ptoken = %llu\n", | |
166 | __func__, | |
167 | lld(ctx->pos), | |
168 | llu(*ptoken)); | |
5db11c21 MM |
169 | |
170 | pos = (__u64) ctx->pos; | |
171 | ||
172 | /* are we done? */ | |
8bb8aefd | 173 | if (pos == ORANGEFS_READDIR_END) { |
5db11c21 MM |
174 | gossip_debug(GOSSIP_DIR_DEBUG, |
175 | "Skipping to termination path\n"); | |
176 | return 0; | |
177 | } | |
178 | ||
179 | gossip_debug(GOSSIP_DIR_DEBUG, | |
8bb8aefd | 180 | "orangefs_readdir called on %s (pos=%llu)\n", |
5db11c21 MM |
181 | dentry->d_name.name, llu(pos)); |
182 | ||
9f5e2f7f | 183 | memset(&readdir_response, 0, sizeof(readdir_response)); |
5db11c21 | 184 | |
8bb8aefd | 185 | new_op = op_alloc(ORANGEFS_VFS_OP_READDIR); |
5db11c21 MM |
186 | if (!new_op) |
187 | return -ENOMEM; | |
188 | ||
ee3b8d37 MB |
189 | /* |
190 | * Only the indices are shared. No memory is actually shared, but the | |
191 | * mechanism is used. | |
192 | */ | |
5db11c21 | 193 | new_op->uses_shared_memory = 1; |
8bb8aefd | 194 | new_op->upcall.req.readdir.refn = orangefs_inode->refn; |
7d221485 MB |
195 | new_op->upcall.req.readdir.max_dirent_count = |
196 | ORANGEFS_MAX_DIRENT_COUNT_READDIR; | |
5db11c21 MM |
197 | |
198 | gossip_debug(GOSSIP_DIR_DEBUG, | |
199 | "%s: upcall.req.readdir.refn.khandle: %pU\n", | |
200 | __func__, | |
201 | &new_op->upcall.req.readdir.refn.khandle); | |
202 | ||
5db11c21 MM |
203 | new_op->upcall.req.readdir.token = *ptoken; |
204 | ||
205 | get_new_buffer_index: | |
b8a99a8f AV |
206 | buffer_index = orangefs_readdir_index_get(); |
207 | if (buffer_index < 0) { | |
208 | ret = buffer_index; | |
7d221485 | 209 | gossip_lerr("orangefs_readdir: orangefs_readdir_index_get() failure (%d)\n", |
5db11c21 MM |
210 | ret); |
211 | goto out_free_op; | |
212 | } | |
213 | new_op->upcall.req.readdir.buf_index = buffer_index; | |
214 | ||
215 | ret = service_operation(new_op, | |
8bb8aefd | 216 | "orangefs_readdir", |
5db11c21 MM |
217 | get_interruptible_flag(dentry->d_inode)); |
218 | ||
219 | gossip_debug(GOSSIP_DIR_DEBUG, | |
220 | "Readdir downcall status is %d. ret:%d\n", | |
221 | new_op->downcall.status, | |
222 | ret); | |
223 | ||
ee3b8d37 MB |
224 | orangefs_readdir_index_put(buffer_index); |
225 | ||
5db11c21 | 226 | if (ret == -EAGAIN && op_state_purged(new_op)) { |
ee3b8d37 | 227 | /* Client-core indices are invalid after it restarted. */ |
5db11c21 MM |
228 | gossip_debug(GOSSIP_DIR_DEBUG, |
229 | "%s: Getting new buffer_index for retry of readdir..\n", | |
230 | __func__); | |
5db11c21 MM |
231 | goto get_new_buffer_index; |
232 | } | |
233 | ||
234 | if (ret == -EIO && op_state_purged(new_op)) { | |
235 | gossip_err("%s: Client is down. Aborting readdir call.\n", | |
236 | __func__); | |
641bb324 | 237 | goto out_free_op; |
5db11c21 MM |
238 | } |
239 | ||
240 | if (ret < 0 || new_op->downcall.status != 0) { | |
241 | gossip_debug(GOSSIP_DIR_DEBUG, | |
242 | "Readdir request failed. Status:%d\n", | |
243 | new_op->downcall.status); | |
5db11c21 MM |
244 | if (ret >= 0) |
245 | ret = new_op->downcall.status; | |
641bb324 | 246 | goto out_free_op; |
9f5e2f7f AV |
247 | } |
248 | ||
249 | dents_buf = new_op->downcall.trailer_buf; | |
250 | if (dents_buf == NULL) { | |
251 | gossip_err("Invalid NULL buffer in readdir response\n"); | |
252 | ret = -ENOMEM; | |
641bb324 | 253 | goto out_free_op; |
5db11c21 MM |
254 | } |
255 | ||
9f5e2f7f AV |
256 | bytes_decoded = decode_dirents(dents_buf, new_op->downcall.trailer_size, |
257 | &readdir_response); | |
5db11c21 | 258 | if (bytes_decoded < 0) { |
5db11c21 | 259 | ret = bytes_decoded; |
9f5e2f7f AV |
260 | gossip_err("Could not decode readdir from buffer %d\n", ret); |
261 | goto out_vfree; | |
5db11c21 MM |
262 | } |
263 | ||
264 | if (bytes_decoded != new_op->downcall.trailer_size) { | |
8bb8aefd | 265 | gossip_err("orangefs_readdir: # bytes decoded (%ld) " |
88309aae MM |
266 | "!= trailer size (%ld)\n", |
267 | bytes_decoded, | |
268 | (long)new_op->downcall.trailer_size); | |
5db11c21 MM |
269 | ret = -EINVAL; |
270 | goto out_destroy_handle; | |
271 | } | |
272 | ||
88309aae | 273 | /* |
8bb8aefd | 274 | * orangefs doesn't actually store dot and dot-dot, but |
88309aae MM |
275 | * we need to have them represented. |
276 | */ | |
5db11c21 MM |
277 | if (pos == 0) { |
278 | ino = get_ino_from_khandle(dentry->d_inode); | |
279 | gossip_debug(GOSSIP_DIR_DEBUG, | |
280 | "%s: calling dir_emit of \".\" with pos = %llu\n", | |
281 | __func__, | |
282 | llu(pos)); | |
283 | ret = dir_emit(ctx, ".", 1, ino, DT_DIR); | |
88309aae | 284 | pos += 1; |
5db11c21 MM |
285 | } |
286 | ||
287 | if (pos == 1) { | |
288 | ino = get_parent_ino_from_dentry(dentry); | |
289 | gossip_debug(GOSSIP_DIR_DEBUG, | |
290 | "%s: calling dir_emit of \"..\" with pos = %llu\n", | |
291 | __func__, | |
292 | llu(pos)); | |
293 | ret = dir_emit(ctx, "..", 2, ino, DT_DIR); | |
88309aae | 294 | pos += 1; |
5db11c21 MM |
295 | } |
296 | ||
88309aae | 297 | /* |
8bb8aefd | 298 | * we stored ORANGEFS_ITERATE_NEXT in ctx->pos last time around |
88309aae MM |
299 | * to prevent "finding" dot and dot-dot on any iteration |
300 | * other than the first. | |
301 | */ | |
8bb8aefd | 302 | if (ctx->pos == ORANGEFS_ITERATE_NEXT) |
88309aae MM |
303 | ctx->pos = 0; |
304 | ||
cf07c0bf MM |
305 | gossip_debug(GOSSIP_DIR_DEBUG, |
306 | "%s: dirent_outcount:%d:\n", | |
307 | __func__, | |
9f5e2f7f | 308 | readdir_response.orangefs_dirent_outcount); |
88309aae | 309 | for (i = ctx->pos; |
9f5e2f7f | 310 | i < readdir_response.orangefs_dirent_outcount; |
88309aae | 311 | i++) { |
9f5e2f7f AV |
312 | len = readdir_response.dirent_array[i].d_length; |
313 | current_entry = readdir_response.dirent_array[i].d_name; | |
8bb8aefd | 314 | current_ino = orangefs_khandle_to_ino( |
9f5e2f7f | 315 | &readdir_response.dirent_array[i].khandle); |
5db11c21 MM |
316 | |
317 | gossip_debug(GOSSIP_DIR_DEBUG, | |
88309aae MM |
318 | "calling dir_emit for %s with len %d" |
319 | ", ctx->pos %ld\n", | |
5db11c21 MM |
320 | current_entry, |
321 | len, | |
88309aae MM |
322 | (unsigned long)ctx->pos); |
323 | /* | |
324 | * type is unknown. We don't return object type | |
325 | * in the dirent_array. This leaves getdents | |
326 | * clueless about type. | |
327 | */ | |
5db11c21 MM |
328 | ret = |
329 | dir_emit(ctx, current_entry, len, current_ino, DT_UNKNOWN); | |
88309aae MM |
330 | if (!ret) |
331 | break; | |
5db11c21 | 332 | ctx->pos++; |
88309aae | 333 | gossip_debug(GOSSIP_DIR_DEBUG, |
5db11c21 MM |
334 | "%s: ctx->pos:%lld\n", |
335 | __func__, | |
336 | lld(ctx->pos)); | |
337 | ||
5db11c21 MM |
338 | } |
339 | ||
54804949 | 340 | /* |
88309aae MM |
341 | * we ran all the way through the last batch, set up for |
342 | * getting another batch... | |
343 | */ | |
344 | if (ret) { | |
9f5e2f7f | 345 | *ptoken = readdir_response.token; |
8bb8aefd | 346 | ctx->pos = ORANGEFS_ITERATE_NEXT; |
5db11c21 MM |
347 | } |
348 | ||
349 | /* | |
350 | * Did we hit the end of the directory? | |
351 | */ | |
e56f4981 | 352 | if (readdir_response.token == ORANGEFS_READDIR_END) { |
88309aae | 353 | gossip_debug(GOSSIP_DIR_DEBUG, |
8bb8aefd YL |
354 | "End of dir detected; setting ctx->pos to ORANGEFS_READDIR_END.\n"); |
355 | ctx->pos = ORANGEFS_READDIR_END; | |
5db11c21 MM |
356 | } |
357 | ||
5db11c21 | 358 | out_destroy_handle: |
9f5e2f7f AV |
359 | /* kfree(NULL) is safe */ |
360 | kfree(readdir_response.dirent_array); | |
361 | out_vfree: | |
362 | gossip_debug(GOSSIP_DIR_DEBUG, "vfree %p\n", dents_buf); | |
363 | vfree(dents_buf); | |
5db11c21 MM |
364 | out_free_op: |
365 | op_release(new_op); | |
8bb8aefd | 366 | gossip_debug(GOSSIP_DIR_DEBUG, "orangefs_readdir returning %d\n", ret); |
5db11c21 MM |
367 | return ret; |
368 | } | |
369 | ||
8bb8aefd | 370 | static int orangefs_dir_open(struct inode *inode, struct file *file) |
5db11c21 MM |
371 | { |
372 | __u64 *ptoken; | |
373 | ||
374 | file->private_data = kmalloc(sizeof(__u64), GFP_KERNEL); | |
375 | if (!file->private_data) | |
376 | return -ENOMEM; | |
377 | ||
378 | ptoken = file->private_data; | |
8bb8aefd | 379 | *ptoken = ORANGEFS_READDIR_START; |
5db11c21 MM |
380 | return 0; |
381 | } | |
382 | ||
8bb8aefd | 383 | static int orangefs_dir_release(struct inode *inode, struct file *file) |
5db11c21 | 384 | { |
8bb8aefd | 385 | orangefs_flush_inode(inode); |
5db11c21 MM |
386 | kfree(file->private_data); |
387 | return 0; | |
388 | } | |
389 | ||
8bb8aefd YL |
390 | /** ORANGEFS implementation of VFS directory operations */ |
391 | const struct file_operations orangefs_dir_operations = { | |
5db11c21 | 392 | .read = generic_read_dir, |
8bb8aefd YL |
393 | .iterate = orangefs_readdir, |
394 | .open = orangefs_dir_open, | |
395 | .release = orangefs_dir_release, | |
5db11c21 | 396 | }; |