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d7e09d03 PT |
1 | /* |
2 | * GPL HEADER START | |
3 | * | |
4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 only, | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License version 2 for more details (a copy is included | |
14 | * in the LICENSE file that accompanied this code). | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * version 2 along with this program; If not, see | |
18 | * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf | |
19 | * | |
20 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
21 | * CA 95054 USA or visit www.sun.com if you need additional information or | |
22 | * have any questions. | |
23 | * | |
24 | * GPL HEADER END | |
25 | */ | |
26 | /* | |
27 | * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. | |
28 | * Use is subject to license terms. | |
29 | * | |
30 | * Copyright (c) 2012, Intel Corporation. | |
31 | */ | |
32 | /* | |
33 | * This file is part of Lustre, http://www.lustre.org/ | |
34 | * Lustre is a trademark of Sun Microsystems, Inc. | |
35 | * | |
36 | * cl_device and cl_device_type implementation for VVP layer. | |
37 | * | |
38 | * Author: Nikita Danilov <nikita.danilov@sun.com> | |
39 | */ | |
40 | ||
41 | #define DEBUG_SUBSYSTEM S_LLITE | |
42 | ||
43 | ||
67a235f5 GKH |
44 | #include "../include/obd.h" |
45 | #include "../include/lustre_lite.h" | |
2d95f10e | 46 | #include "llite_internal.h" |
d7e09d03 PT |
47 | #include "vvp_internal.h" |
48 | ||
49 | /***************************************************************************** | |
50 | * | |
51 | * Vvp device and device type functions. | |
52 | * | |
53 | */ | |
54 | ||
55 | /* | |
56 | * vvp_ prefix stands for "Vfs Vm Posix". It corresponds to historical | |
57 | * "llite_" (var. "ll_") prefix. | |
58 | */ | |
59 | ||
2d95f10e | 60 | static struct kmem_cache *vvp_thread_kmem; |
d7e09d03 PT |
61 | static struct kmem_cache *vvp_session_kmem; |
62 | static struct lu_kmem_descr vvp_caches[] = { | |
63 | { | |
64 | .ckd_cache = &vvp_thread_kmem, | |
65 | .ckd_name = "vvp_thread_kmem", | |
66 | .ckd_size = sizeof (struct vvp_thread_info), | |
67 | }, | |
68 | { | |
69 | .ckd_cache = &vvp_session_kmem, | |
70 | .ckd_name = "vvp_session_kmem", | |
71 | .ckd_size = sizeof (struct vvp_session) | |
72 | }, | |
73 | { | |
74 | .ckd_cache = NULL | |
75 | } | |
76 | }; | |
77 | ||
78 | static void *vvp_key_init(const struct lu_context *ctx, | |
79 | struct lu_context_key *key) | |
80 | { | |
81 | struct vvp_thread_info *info; | |
82 | ||
0be19afa | 83 | OBD_SLAB_ALLOC_PTR_GFP(info, vvp_thread_kmem, GFP_NOFS); |
d7e09d03 PT |
84 | if (info == NULL) |
85 | info = ERR_PTR(-ENOMEM); | |
86 | return info; | |
87 | } | |
88 | ||
89 | static void vvp_key_fini(const struct lu_context *ctx, | |
90 | struct lu_context_key *key, void *data) | |
91 | { | |
92 | struct vvp_thread_info *info = data; | |
93 | OBD_SLAB_FREE_PTR(info, vvp_thread_kmem); | |
94 | } | |
95 | ||
96 | static void *vvp_session_key_init(const struct lu_context *ctx, | |
97 | struct lu_context_key *key) | |
98 | { | |
99 | struct vvp_session *session; | |
100 | ||
0be19afa | 101 | OBD_SLAB_ALLOC_PTR_GFP(session, vvp_session_kmem, GFP_NOFS); |
d7e09d03 PT |
102 | if (session == NULL) |
103 | session = ERR_PTR(-ENOMEM); | |
104 | return session; | |
105 | } | |
106 | ||
107 | static void vvp_session_key_fini(const struct lu_context *ctx, | |
108 | struct lu_context_key *key, void *data) | |
109 | { | |
110 | struct vvp_session *session = data; | |
111 | OBD_SLAB_FREE_PTR(session, vvp_session_kmem); | |
112 | } | |
113 | ||
114 | ||
115 | struct lu_context_key vvp_key = { | |
116 | .lct_tags = LCT_CL_THREAD, | |
117 | .lct_init = vvp_key_init, | |
118 | .lct_fini = vvp_key_fini | |
119 | }; | |
120 | ||
121 | struct lu_context_key vvp_session_key = { | |
122 | .lct_tags = LCT_SESSION, | |
123 | .lct_init = vvp_session_key_init, | |
124 | .lct_fini = vvp_session_key_fini | |
125 | }; | |
126 | ||
127 | /* type constructor/destructor: vvp_type_{init,fini,start,stop}(). */ | |
128 | LU_TYPE_INIT_FINI(vvp, &ccc_key, &ccc_session_key, &vvp_key, &vvp_session_key); | |
129 | ||
130 | static const struct lu_device_operations vvp_lu_ops = { | |
131 | .ldo_object_alloc = vvp_object_alloc | |
132 | }; | |
133 | ||
134 | static const struct cl_device_operations vvp_cl_ops = { | |
135 | .cdo_req_init = ccc_req_init | |
136 | }; | |
137 | ||
138 | static struct lu_device *vvp_device_alloc(const struct lu_env *env, | |
139 | struct lu_device_type *t, | |
140 | struct lustre_cfg *cfg) | |
141 | { | |
142 | return ccc_device_alloc(env, t, cfg, &vvp_lu_ops, &vvp_cl_ops); | |
143 | } | |
144 | ||
145 | static const struct lu_device_type_operations vvp_device_type_ops = { | |
146 | .ldto_init = vvp_type_init, | |
147 | .ldto_fini = vvp_type_fini, | |
148 | ||
149 | .ldto_start = vvp_type_start, | |
150 | .ldto_stop = vvp_type_stop, | |
151 | ||
152 | .ldto_device_alloc = vvp_device_alloc, | |
153 | .ldto_device_free = ccc_device_free, | |
154 | .ldto_device_init = ccc_device_init, | |
155 | .ldto_device_fini = ccc_device_fini | |
156 | }; | |
157 | ||
158 | struct lu_device_type vvp_device_type = { | |
159 | .ldt_tags = LU_DEVICE_CL, | |
160 | .ldt_name = LUSTRE_VVP_NAME, | |
161 | .ldt_ops = &vvp_device_type_ops, | |
162 | .ldt_ctx_tags = LCT_CL_THREAD | |
163 | }; | |
164 | ||
165 | /** | |
166 | * A mutex serializing calls to vvp_inode_fini() under extreme memory | |
167 | * pressure, when environments cannot be allocated. | |
168 | */ | |
169 | int vvp_global_init(void) | |
170 | { | |
171 | int result; | |
172 | ||
173 | result = lu_kmem_init(vvp_caches); | |
174 | if (result == 0) { | |
175 | result = ccc_global_init(&vvp_device_type); | |
176 | if (result != 0) | |
177 | lu_kmem_fini(vvp_caches); | |
178 | } | |
179 | return result; | |
180 | } | |
181 | ||
182 | void vvp_global_fini(void) | |
183 | { | |
184 | ccc_global_fini(&vvp_device_type); | |
185 | lu_kmem_fini(vvp_caches); | |
186 | } | |
187 | ||
188 | ||
189 | /***************************************************************************** | |
190 | * | |
191 | * mirror obd-devices into cl devices. | |
192 | * | |
193 | */ | |
194 | ||
195 | int cl_sb_init(struct super_block *sb) | |
196 | { | |
197 | struct ll_sb_info *sbi; | |
198 | struct cl_device *cl; | |
199 | struct lu_env *env; | |
200 | int rc = 0; | |
201 | int refcheck; | |
202 | ||
203 | sbi = ll_s2sbi(sb); | |
204 | env = cl_env_get(&refcheck); | |
205 | if (!IS_ERR(env)) { | |
206 | cl = cl_type_setup(env, NULL, &vvp_device_type, | |
207 | sbi->ll_dt_exp->exp_obd->obd_lu_dev); | |
208 | if (!IS_ERR(cl)) { | |
209 | cl2ccc_dev(cl)->cdv_sb = sb; | |
210 | sbi->ll_cl = cl; | |
211 | sbi->ll_site = cl2lu_dev(cl)->ld_site; | |
212 | } | |
213 | cl_env_put(env, &refcheck); | |
214 | } else | |
215 | rc = PTR_ERR(env); | |
0a3bdb00 | 216 | return rc; |
d7e09d03 PT |
217 | } |
218 | ||
219 | int cl_sb_fini(struct super_block *sb) | |
220 | { | |
221 | struct ll_sb_info *sbi; | |
222 | struct lu_env *env; | |
223 | struct cl_device *cld; | |
224 | int refcheck; | |
225 | int result; | |
226 | ||
d7e09d03 PT |
227 | sbi = ll_s2sbi(sb); |
228 | env = cl_env_get(&refcheck); | |
229 | if (!IS_ERR(env)) { | |
230 | cld = sbi->ll_cl; | |
231 | ||
232 | if (cld != NULL) { | |
233 | cl_stack_fini(env, cld); | |
234 | sbi->ll_cl = NULL; | |
235 | sbi->ll_site = NULL; | |
236 | } | |
237 | cl_env_put(env, &refcheck); | |
238 | result = 0; | |
239 | } else { | |
240 | CERROR("Cannot cleanup cl-stack due to memory shortage.\n"); | |
241 | result = PTR_ERR(env); | |
242 | } | |
243 | /* | |
244 | * If mount failed (sbi->ll_cl == NULL), and this there are no other | |
245 | * mounts, stop device types manually (this usually happens | |
246 | * automatically when last device is destroyed). | |
247 | */ | |
248 | lu_types_stop(); | |
0a3bdb00 | 249 | return result; |
d7e09d03 PT |
250 | } |
251 | ||
252 | /**************************************************************************** | |
253 | * | |
254 | * /proc/fs/lustre/llite/$MNT/dump_page_cache | |
255 | * | |
256 | ****************************************************************************/ | |
257 | ||
258 | /* | |
259 | * To represent contents of a page cache as a byte stream, following | |
260 | * information if encoded in 64bit offset: | |
261 | * | |
262 | * - file hash bucket in lu_site::ls_hash[] 28bits | |
263 | * | |
264 | * - how far file is from bucket head 4bits | |
265 | * | |
266 | * - page index 32bits | |
267 | * | |
268 | * First two data identify a file in the cache uniquely. | |
269 | */ | |
270 | ||
271 | #define PGC_OBJ_SHIFT (32 + 4) | |
272 | #define PGC_DEPTH_SHIFT (32) | |
273 | ||
274 | struct vvp_pgcache_id { | |
275 | unsigned vpi_bucket; | |
276 | unsigned vpi_depth; | |
277 | uint32_t vpi_index; | |
278 | ||
279 | unsigned vpi_curdep; | |
280 | struct lu_object_header *vpi_obj; | |
281 | }; | |
282 | ||
283 | static void vvp_pgcache_id_unpack(loff_t pos, struct vvp_pgcache_id *id) | |
284 | { | |
285 | CLASSERT(sizeof(pos) == sizeof(__u64)); | |
286 | ||
287 | id->vpi_index = pos & 0xffffffff; | |
288 | id->vpi_depth = (pos >> PGC_DEPTH_SHIFT) & 0xf; | |
289 | id->vpi_bucket = ((unsigned long long)pos >> PGC_OBJ_SHIFT); | |
290 | } | |
291 | ||
292 | static loff_t vvp_pgcache_id_pack(struct vvp_pgcache_id *id) | |
293 | { | |
294 | return | |
295 | ((__u64)id->vpi_index) | | |
296 | ((__u64)id->vpi_depth << PGC_DEPTH_SHIFT) | | |
297 | ((__u64)id->vpi_bucket << PGC_OBJ_SHIFT); | |
298 | } | |
299 | ||
6da6eabe | 300 | static int vvp_pgcache_obj_get(struct cfs_hash *hs, struct cfs_hash_bd *bd, |
d7e09d03 PT |
301 | struct hlist_node *hnode, void *data) |
302 | { | |
303 | struct vvp_pgcache_id *id = data; | |
304 | struct lu_object_header *hdr = cfs_hash_object(hs, hnode); | |
305 | ||
306 | if (id->vpi_curdep-- > 0) | |
307 | return 0; /* continue */ | |
308 | ||
309 | if (lu_object_is_dying(hdr)) | |
310 | return 1; | |
311 | ||
312 | cfs_hash_get(hs, hnode); | |
313 | id->vpi_obj = hdr; | |
314 | return 1; | |
315 | } | |
316 | ||
317 | static struct cl_object *vvp_pgcache_obj(const struct lu_env *env, | |
318 | struct lu_device *dev, | |
319 | struct vvp_pgcache_id *id) | |
320 | { | |
321 | LASSERT(lu_device_is_cl(dev)); | |
322 | ||
323 | id->vpi_depth &= 0xf; | |
324 | id->vpi_obj = NULL; | |
325 | id->vpi_curdep = id->vpi_depth; | |
326 | ||
327 | cfs_hash_hlist_for_each(dev->ld_site->ls_obj_hash, id->vpi_bucket, | |
328 | vvp_pgcache_obj_get, id); | |
329 | if (id->vpi_obj != NULL) { | |
330 | struct lu_object *lu_obj; | |
331 | ||
332 | lu_obj = lu_object_locate(id->vpi_obj, dev->ld_type); | |
333 | if (lu_obj != NULL) { | |
334 | lu_object_ref_add(lu_obj, "dump", current); | |
335 | return lu2cl(lu_obj); | |
336 | } | |
337 | lu_object_put(env, lu_object_top(id->vpi_obj)); | |
338 | ||
339 | } else if (id->vpi_curdep > 0) { | |
340 | id->vpi_depth = 0xf; | |
341 | } | |
342 | return NULL; | |
343 | } | |
344 | ||
345 | static loff_t vvp_pgcache_find(const struct lu_env *env, | |
346 | struct lu_device *dev, loff_t pos) | |
347 | { | |
348 | struct cl_object *clob; | |
349 | struct lu_site *site; | |
350 | struct vvp_pgcache_id id; | |
351 | ||
352 | site = dev->ld_site; | |
353 | vvp_pgcache_id_unpack(pos, &id); | |
354 | ||
355 | while (1) { | |
356 | if (id.vpi_bucket >= CFS_HASH_NHLIST(site->ls_obj_hash)) | |
357 | return ~0ULL; | |
358 | clob = vvp_pgcache_obj(env, dev, &id); | |
359 | if (clob != NULL) { | |
360 | struct cl_object_header *hdr; | |
361 | int nr; | |
362 | struct cl_page *pg; | |
363 | ||
364 | /* got an object. Find next page. */ | |
365 | hdr = cl_object_header(clob); | |
366 | ||
367 | spin_lock(&hdr->coh_page_guard); | |
368 | nr = radix_tree_gang_lookup(&hdr->coh_tree, | |
369 | (void **)&pg, | |
370 | id.vpi_index, 1); | |
371 | if (nr > 0) { | |
372 | id.vpi_index = pg->cp_index; | |
373 | /* Cant support over 16T file */ | |
374 | nr = !(pg->cp_index > 0xffffffff); | |
375 | } | |
376 | spin_unlock(&hdr->coh_page_guard); | |
377 | ||
378 | lu_object_ref_del(&clob->co_lu, "dump", current); | |
379 | cl_object_put(env, clob); | |
380 | if (nr > 0) | |
381 | return vvp_pgcache_id_pack(&id); | |
382 | } | |
383 | /* to the next object. */ | |
384 | ++id.vpi_depth; | |
385 | id.vpi_depth &= 0xf; | |
386 | if (id.vpi_depth == 0 && ++id.vpi_bucket == 0) | |
387 | return ~0ULL; | |
388 | id.vpi_index = 0; | |
389 | } | |
390 | } | |
391 | ||
392 | #define seq_page_flag(seq, page, flag, has_flags) do { \ | |
393 | if (test_bit(PG_##flag, &(page)->flags)) { \ | |
394 | seq_printf(seq, "%s"#flag, has_flags ? "|" : ""); \ | |
395 | has_flags = 1; \ | |
396 | } \ | |
a58a38ac | 397 | } while (0) |
d7e09d03 PT |
398 | |
399 | static void vvp_pgcache_page_show(const struct lu_env *env, | |
400 | struct seq_file *seq, struct cl_page *page) | |
401 | { | |
402 | struct ccc_page *cpg; | |
403 | struct page *vmpage; | |
404 | int has_flags; | |
405 | ||
406 | cpg = cl2ccc_page(cl_page_at(page, &vvp_device_type)); | |
407 | vmpage = cpg->cpg_page; | |
1d8cb70c | 408 | seq_printf(seq, " %5i | %p %p %s %s %s %s | %p %lu/%u(%p) %lu %u [", |
d7e09d03 PT |
409 | 0 /* gen */, |
410 | cpg, page, | |
411 | "none", | |
412 | cpg->cpg_write_queued ? "wq" : "- ", | |
413 | cpg->cpg_defer_uptodate ? "du" : "- ", | |
414 | PageWriteback(vmpage) ? "wb" : "-", | |
415 | vmpage, vmpage->mapping->host->i_ino, | |
416 | vmpage->mapping->host->i_generation, | |
417 | vmpage->mapping->host, vmpage->index, | |
418 | page_count(vmpage)); | |
419 | has_flags = 0; | |
420 | seq_page_flag(seq, vmpage, locked, has_flags); | |
421 | seq_page_flag(seq, vmpage, error, has_flags); | |
422 | seq_page_flag(seq, vmpage, referenced, has_flags); | |
423 | seq_page_flag(seq, vmpage, uptodate, has_flags); | |
424 | seq_page_flag(seq, vmpage, dirty, has_flags); | |
425 | seq_page_flag(seq, vmpage, writeback, has_flags); | |
426 | seq_printf(seq, "%s]\n", has_flags ? "" : "-"); | |
427 | } | |
428 | ||
429 | static int vvp_pgcache_show(struct seq_file *f, void *v) | |
430 | { | |
431 | loff_t pos; | |
432 | struct ll_sb_info *sbi; | |
433 | struct cl_object *clob; | |
434 | struct lu_env *env; | |
435 | struct cl_page *page; | |
436 | struct cl_object_header *hdr; | |
437 | struct vvp_pgcache_id id; | |
438 | int refcheck; | |
439 | int result; | |
440 | ||
441 | env = cl_env_get(&refcheck); | |
442 | if (!IS_ERR(env)) { | |
443 | pos = *(loff_t *) v; | |
444 | vvp_pgcache_id_unpack(pos, &id); | |
445 | sbi = f->private; | |
446 | clob = vvp_pgcache_obj(env, &sbi->ll_cl->cd_lu_dev, &id); | |
447 | if (clob != NULL) { | |
448 | hdr = cl_object_header(clob); | |
449 | ||
450 | spin_lock(&hdr->coh_page_guard); | |
451 | page = cl_page_lookup(hdr, id.vpi_index); | |
452 | spin_unlock(&hdr->coh_page_guard); | |
453 | ||
454 | seq_printf(f, "%8x@"DFID": ", | |
455 | id.vpi_index, PFID(&hdr->coh_lu.loh_fid)); | |
456 | if (page != NULL) { | |
457 | vvp_pgcache_page_show(env, f, page); | |
458 | cl_page_put(env, page); | |
459 | } else | |
460 | seq_puts(f, "missing\n"); | |
461 | lu_object_ref_del(&clob->co_lu, "dump", current); | |
462 | cl_object_put(env, clob); | |
463 | } else | |
464 | seq_printf(f, "%llx missing\n", pos); | |
465 | cl_env_put(env, &refcheck); | |
466 | result = 0; | |
467 | } else | |
468 | result = PTR_ERR(env); | |
469 | return result; | |
470 | } | |
471 | ||
472 | static void *vvp_pgcache_start(struct seq_file *f, loff_t *pos) | |
473 | { | |
474 | struct ll_sb_info *sbi; | |
475 | struct lu_env *env; | |
476 | int refcheck; | |
477 | ||
478 | sbi = f->private; | |
479 | ||
480 | env = cl_env_get(&refcheck); | |
481 | if (!IS_ERR(env)) { | |
482 | sbi = f->private; | |
483 | if (sbi->ll_site->ls_obj_hash->hs_cur_bits > 64 - PGC_OBJ_SHIFT) | |
484 | pos = ERR_PTR(-EFBIG); | |
485 | else { | |
486 | *pos = vvp_pgcache_find(env, &sbi->ll_cl->cd_lu_dev, | |
487 | *pos); | |
488 | if (*pos == ~0ULL) | |
489 | pos = NULL; | |
490 | } | |
491 | cl_env_put(env, &refcheck); | |
492 | } | |
493 | return pos; | |
494 | } | |
495 | ||
496 | static void *vvp_pgcache_next(struct seq_file *f, void *v, loff_t *pos) | |
497 | { | |
498 | struct ll_sb_info *sbi; | |
499 | struct lu_env *env; | |
500 | int refcheck; | |
501 | ||
502 | env = cl_env_get(&refcheck); | |
503 | if (!IS_ERR(env)) { | |
504 | sbi = f->private; | |
505 | *pos = vvp_pgcache_find(env, &sbi->ll_cl->cd_lu_dev, *pos + 1); | |
506 | if (*pos == ~0ULL) | |
507 | pos = NULL; | |
508 | cl_env_put(env, &refcheck); | |
509 | } | |
510 | return pos; | |
511 | } | |
512 | ||
513 | static void vvp_pgcache_stop(struct seq_file *f, void *v) | |
514 | { | |
515 | /* Nothing to do */ | |
516 | } | |
517 | ||
518 | static struct seq_operations vvp_pgcache_ops = { | |
519 | .start = vvp_pgcache_start, | |
520 | .next = vvp_pgcache_next, | |
521 | .stop = vvp_pgcache_stop, | |
522 | .show = vvp_pgcache_show | |
523 | }; | |
524 | ||
525 | static int vvp_dump_pgcache_seq_open(struct inode *inode, struct file *filp) | |
526 | { | |
73bb1da6 | 527 | struct ll_sb_info *sbi = PDE_DATA(inode); |
d7e09d03 PT |
528 | struct seq_file *seq; |
529 | int result; | |
530 | ||
531 | result = seq_open(filp, &vvp_pgcache_ops); | |
532 | if (result == 0) { | |
533 | seq = filp->private_data; | |
534 | seq->private = sbi; | |
535 | } | |
536 | return result; | |
537 | } | |
538 | ||
2d95f10e | 539 | const struct file_operations vvp_dump_pgcache_file_ops = { |
d7e09d03 PT |
540 | .owner = THIS_MODULE, |
541 | .open = vvp_dump_pgcache_seq_open, | |
542 | .read = seq_read, | |
543 | .llseek = seq_lseek, | |
544 | .release = seq_release, | |
545 | }; |