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33 * This file is part of Lustre, http://www.lustre.org/
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36 * cl_device and cl_device_type implementation for VVP layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
39 * Author: Jinshan Xiong <jinshan.xiong@intel.com>
42 #define DEBUG_SUBSYSTEM S_LLITE
46 #include "llite_internal.h"
47 #include "vvp_internal.h"
49 /*****************************************************************************
51 * Vvp device and device type functions.
56 * vvp_ prefix stands for "Vfs Vm Posix". It corresponds to historical
57 * "llite_" (var. "ll_") prefix.
60 struct kmem_cache *vvp_object_kmem;
61 static struct kmem_cache *vvp_thread_kmem;
62 static struct kmem_cache *vvp_session_kmem;
63 static struct lu_kmem_descr vvp_caches[] = {
65 .ckd_cache = &vvp_object_kmem,
66 .ckd_name = "vvp_object_kmem",
67 .ckd_size = sizeof(struct vvp_object),
70 .ckd_cache = &vvp_thread_kmem,
71 .ckd_name = "vvp_thread_kmem",
72 .ckd_size = sizeof (struct vvp_thread_info),
75 .ckd_cache = &vvp_session_kmem,
76 .ckd_name = "vvp_session_kmem",
77 .ckd_size = sizeof (struct vvp_session)
84 static void *vvp_key_init(const struct lu_context *ctx,
85 struct lu_context_key *key)
87 struct vvp_thread_info *info;
89 OBD_SLAB_ALLOC_PTR_GFP(info, vvp_thread_kmem, GFP_NOFS);
91 info = ERR_PTR(-ENOMEM);
95 static void vvp_key_fini(const struct lu_context *ctx,
96 struct lu_context_key *key, void *data)
98 struct vvp_thread_info *info = data;
99 OBD_SLAB_FREE_PTR(info, vvp_thread_kmem);
102 static void *vvp_session_key_init(const struct lu_context *ctx,
103 struct lu_context_key *key)
105 struct vvp_session *session;
107 OBD_SLAB_ALLOC_PTR_GFP(session, vvp_session_kmem, GFP_NOFS);
109 session = ERR_PTR(-ENOMEM);
113 static void vvp_session_key_fini(const struct lu_context *ctx,
114 struct lu_context_key *key, void *data)
116 struct vvp_session *session = data;
117 OBD_SLAB_FREE_PTR(session, vvp_session_kmem);
121 struct lu_context_key vvp_key = {
122 .lct_tags = LCT_CL_THREAD,
123 .lct_init = vvp_key_init,
124 .lct_fini = vvp_key_fini
127 struct lu_context_key vvp_session_key = {
128 .lct_tags = LCT_SESSION,
129 .lct_init = vvp_session_key_init,
130 .lct_fini = vvp_session_key_fini
133 /* type constructor/destructor: vvp_type_{init,fini,start,stop}(). */
134 LU_TYPE_INIT_FINI(vvp, &ccc_key, &ccc_session_key, &vvp_key, &vvp_session_key);
136 static const struct lu_device_operations vvp_lu_ops = {
137 .ldo_object_alloc = vvp_object_alloc
140 static const struct cl_device_operations vvp_cl_ops = {
141 .cdo_req_init = ccc_req_init
144 static struct lu_device *vvp_device_free(const struct lu_env *env,
147 struct vvp_device *vdv = lu2vvp_dev(d);
148 struct cl_site *site = lu2cl_site(d->ld_site);
149 struct lu_device *next = cl2lu_dev(vdv->vdv_next);
151 if (d->ld_site != NULL) {
156 cl_device_fini(lu2cl_dev(d));
161 static struct lu_device *vvp_device_alloc(const struct lu_env *env,
162 struct lu_device_type *t,
163 struct lustre_cfg *cfg)
165 struct vvp_device *vdv;
166 struct lu_device *lud;
167 struct cl_site *site;
173 RETURN(ERR_PTR(-ENOMEM));
175 lud = &vdv->vdv_cl.cd_lu_dev;
176 cl_device_init(&vdv->vdv_cl, t);
177 vvp2lu_dev(vdv)->ld_ops = &vvp_lu_ops;
178 vdv->vdv_cl.cd_ops = &vvp_cl_ops;
182 rc = cl_site_init(site, &vdv->vdv_cl);
184 rc = lu_site_init_finish(&site->cs_lu);
186 LASSERT(lud->ld_site == NULL);
187 CERROR("Cannot init lu_site, rc %d.\n", rc);
193 vvp_device_free(env, lud);
199 static int vvp_device_init(const struct lu_env *env, struct lu_device *d,
200 const char *name, struct lu_device *next)
202 struct vvp_device *vdv;
207 vdv->vdv_next = lu2cl_dev(next);
209 LASSERT(d->ld_site != NULL && next->ld_type != NULL);
210 next->ld_site = d->ld_site;
211 rc = next->ld_type->ldt_ops->ldto_device_init(
212 env, next, next->ld_type->ldt_name, NULL);
215 lu_ref_add(&next->ld_reference, "lu-stack", &lu_site_init);
220 static struct lu_device *vvp_device_fini(const struct lu_env *env,
223 return cl2lu_dev(lu2vvp_dev(d)->vdv_next);
226 static const struct lu_device_type_operations vvp_device_type_ops = {
227 .ldto_init = vvp_type_init,
228 .ldto_fini = vvp_type_fini,
230 .ldto_start = vvp_type_start,
231 .ldto_stop = vvp_type_stop,
233 .ldto_device_alloc = vvp_device_alloc,
234 .ldto_device_free = vvp_device_free,
235 .ldto_device_init = vvp_device_init,
236 .ldto_device_fini = vvp_device_fini,
239 struct lu_device_type vvp_device_type = {
240 .ldt_tags = LU_DEVICE_CL,
241 .ldt_name = LUSTRE_VVP_NAME,
242 .ldt_ops = &vvp_device_type_ops,
243 .ldt_ctx_tags = LCT_CL_THREAD
247 * A mutex serializing calls to vvp_inode_fini() under extreme memory
248 * pressure, when environments cannot be allocated.
250 int vvp_global_init(void)
254 result = lu_kmem_init(vvp_caches);
256 result = ccc_global_init(&vvp_device_type);
258 lu_kmem_fini(vvp_caches);
263 void vvp_global_fini(void)
265 ccc_global_fini(&vvp_device_type);
266 lu_kmem_fini(vvp_caches);
270 /*****************************************************************************
272 * mirror obd-devices into cl devices.
276 int cl_sb_init(struct super_block *sb)
278 struct ll_sb_info *sbi;
279 struct cl_device *cl;
285 env = cl_env_get(&refcheck);
287 cl = cl_type_setup(env, NULL, &vvp_device_type,
288 sbi->ll_dt_exp->exp_obd->obd_lu_dev);
290 cl2vvp_dev(cl)->vdv_sb = sb;
292 sbi->ll_site = cl2lu_dev(cl)->ld_site;
294 cl_env_put(env, &refcheck);
300 int cl_sb_fini(struct super_block *sb)
302 struct ll_sb_info *sbi;
304 struct cl_device *cld;
310 env = cl_env_get(&refcheck);
315 cl_stack_fini(env, cld);
319 cl_env_put(env, &refcheck);
322 CERROR("Cannot cleanup cl-stack due to memory shortage.\n");
323 result = PTR_ERR(env);
329 /****************************************************************************
331 * /proc/fs/lustre/llite/$MNT/dump_page_cache
333 ****************************************************************************/
336 * To represent contents of a page cache as a byte stream, following
337 * information if encoded in 64bit offset:
339 * - file hash bucket in lu_site::ls_hash[] 28bits
341 * - how far file is from bucket head 4bits
343 * - page index 32bits
345 * First two data identify a file in the cache uniquely.
348 #define PGC_OBJ_SHIFT (32 + 4)
349 #define PGC_DEPTH_SHIFT (32)
351 struct vvp_pgcache_id {
357 struct lu_object_header *vpi_obj;
360 static void vvp_pgcache_id_unpack(loff_t pos, struct vvp_pgcache_id *id)
362 CLASSERT(sizeof(pos) == sizeof(__u64));
364 id->vpi_index = pos & 0xffffffff;
365 id->vpi_depth = (pos >> PGC_DEPTH_SHIFT) & 0xf;
366 id->vpi_bucket = ((unsigned long long)pos >> PGC_OBJ_SHIFT);
369 static loff_t vvp_pgcache_id_pack(struct vvp_pgcache_id *id)
372 ((__u64)id->vpi_index) |
373 ((__u64)id->vpi_depth << PGC_DEPTH_SHIFT) |
374 ((__u64)id->vpi_bucket << PGC_OBJ_SHIFT);
377 static int vvp_pgcache_obj_get(cfs_hash_t *hs, cfs_hash_bd_t *bd,
378 struct hlist_node *hnode, void *data)
380 struct vvp_pgcache_id *id = data;
381 struct lu_object_header *hdr = cfs_hash_object(hs, hnode);
383 if (id->vpi_curdep-- > 0)
384 return 0; /* continue */
386 if (lu_object_is_dying(hdr))
389 cfs_hash_get(hs, hnode);
394 static struct cl_object *vvp_pgcache_obj(const struct lu_env *env,
395 struct lu_device *dev,
396 struct vvp_pgcache_id *id)
398 LASSERT(lu_device_is_cl(dev));
400 id->vpi_depth &= 0xf;
402 id->vpi_curdep = id->vpi_depth;
404 cfs_hash_hlist_for_each(dev->ld_site->ls_obj_hash, id->vpi_bucket,
405 vvp_pgcache_obj_get, id);
406 if (id->vpi_obj != NULL) {
407 struct lu_object *lu_obj;
409 lu_obj = lu_object_locate(id->vpi_obj, dev->ld_type);
410 if (lu_obj != NULL) {
411 lu_object_ref_add(lu_obj, "dump", current);
412 return lu2cl(lu_obj);
414 lu_object_put(env, lu_object_top(id->vpi_obj));
416 } else if (id->vpi_curdep > 0) {
422 static loff_t vvp_pgcache_find(const struct lu_env *env,
423 struct lu_device *dev, loff_t pos)
425 struct cl_object *clob;
426 struct lu_site *site;
427 struct vvp_pgcache_id id;
430 vvp_pgcache_id_unpack(pos, &id);
433 if (id.vpi_bucket >= CFS_HASH_NHLIST(site->ls_obj_hash))
435 clob = vvp_pgcache_obj(env, dev, &id);
437 struct inode *inode = vvp_object_inode(clob);
441 nr = find_get_pages_contig(inode->i_mapping,
442 id.vpi_index, 1, &vmpage);
444 id.vpi_index = vmpage->index;
445 /* Cant support over 16T file */
446 nr = !(vmpage->index > 0xffffffff);
447 page_cache_release(vmpage);
450 lu_object_ref_del(&clob->co_lu, "dump", current);
451 cl_object_put(env, clob);
453 return vvp_pgcache_id_pack(&id);
455 /* to the next object. */
458 if (id.vpi_depth == 0 && ++id.vpi_bucket == 0)
464 #define seq_page_flag(seq, page, flag, has_flags) do { \
465 if (test_bit(PG_##flag, &(page)->flags)) { \
466 seq_printf(seq, "%s"#flag, has_flags ? "|" : ""); \
471 static void vvp_pgcache_page_show(const struct lu_env *env,
472 struct seq_file *seq, struct cl_page *page)
474 struct ccc_page *cpg;
478 cpg = cl2ccc_page(cl_page_at(page, &vvp_device_type));
479 vmpage = cpg->cpg_page;
480 seq_printf(seq, " %5i | %p %p %s %s %s %s | %p "DFID"(%p) %lu %u [",
484 cpg->cpg_write_queued ? "wq" : "- ",
485 cpg->cpg_defer_uptodate ? "du" : "- ",
486 PageWriteback(vmpage) ? "wb" : "-",
488 PFID(ll_inode2fid(vmpage->mapping->host)),
489 vmpage->mapping->host, vmpage->index,
492 seq_page_flag(seq, vmpage, locked, has_flags);
493 seq_page_flag(seq, vmpage, error, has_flags);
494 seq_page_flag(seq, vmpage, referenced, has_flags);
495 seq_page_flag(seq, vmpage, uptodate, has_flags);
496 seq_page_flag(seq, vmpage, dirty, has_flags);
497 seq_page_flag(seq, vmpage, writeback, has_flags);
498 seq_printf(seq, "%s]\n", has_flags ? "" : "-");
501 static int vvp_pgcache_show(struct seq_file *f, void *v)
504 struct ll_sb_info *sbi;
505 struct cl_object *clob;
507 struct vvp_pgcache_id id;
511 env = cl_env_get(&refcheck);
514 vvp_pgcache_id_unpack(pos, &id);
516 clob = vvp_pgcache_obj(env, &sbi->ll_cl->cd_lu_dev, &id);
518 struct inode *inode = vvp_object_inode(clob);
519 struct cl_page *page = NULL;
522 result = find_get_pages_contig(inode->i_mapping,
523 id.vpi_index, 1, &vmpage);
526 page = cl_vmpage_page(vmpage, clob);
529 page_cache_release(vmpage);
532 seq_printf(f, "%8x@"DFID": ", id.vpi_index,
533 PFID(lu_object_fid(&clob->co_lu)));
535 vvp_pgcache_page_show(env, f, page);
536 cl_page_put(env, page);
538 seq_puts(f, "missing\n");
539 lu_object_ref_del(&clob->co_lu, "dump", current);
540 cl_object_put(env, clob);
542 seq_printf(f, "%llx missing\n", pos);
543 cl_env_put(env, &refcheck);
546 result = PTR_ERR(env);
550 static void *vvp_pgcache_start(struct seq_file *f, loff_t *pos)
552 struct ll_sb_info *sbi;
558 env = cl_env_get(&refcheck);
561 if (sbi->ll_site->ls_obj_hash->hs_cur_bits > 64 - PGC_OBJ_SHIFT)
562 pos = ERR_PTR(-EFBIG);
564 *pos = vvp_pgcache_find(env, &sbi->ll_cl->cd_lu_dev,
569 cl_env_put(env, &refcheck);
574 static void *vvp_pgcache_next(struct seq_file *f, void *v, loff_t *pos)
576 struct ll_sb_info *sbi;
580 env = cl_env_get(&refcheck);
583 *pos = vvp_pgcache_find(env, &sbi->ll_cl->cd_lu_dev, *pos + 1);
586 cl_env_put(env, &refcheck);
591 static void vvp_pgcache_stop(struct seq_file *f, void *v)
596 static struct seq_operations vvp_pgcache_ops = {
597 .start = vvp_pgcache_start,
598 .next = vvp_pgcache_next,
599 .stop = vvp_pgcache_stop,
600 .show = vvp_pgcache_show
603 static int vvp_dump_pgcache_seq_open(struct inode *inode, struct file *filp)
605 struct ll_sb_info *sbi = PDE_DATA(inode);
606 struct seq_file *seq;
609 result = seq_open(filp, &vvp_pgcache_ops);
611 seq = filp->private_data;
617 const struct file_operations vvp_dump_pgcache_file_ops = {
618 .owner = THIS_MODULE,
619 .open = vvp_dump_pgcache_seq_open,
622 .release = seq_release,