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27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * cl_device and cl_device_type implementation for VVP layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
41 #define DEBUG_SUBSYSTEM S_LLITE
44 # error This file is kernel only.
48 #include <lustre_lite.h>
50 #include "vvp_internal.h"
52 /*****************************************************************************
54 * Vvp device and device type functions.
59 * vvp_ prefix stands for "Vfs Vm Posix". It corresponds to historical
60 * "llite_" (var. "ll_") prefix.
63 struct kmem_cache *vvp_thread_kmem;
64 static struct kmem_cache *vvp_session_kmem;
65 static struct lu_kmem_descr vvp_caches[] = {
67 .ckd_cache = &vvp_thread_kmem,
68 .ckd_name = "vvp_thread_kmem",
69 .ckd_size = sizeof (struct vvp_thread_info),
72 .ckd_cache = &vvp_session_kmem,
73 .ckd_name = "vvp_session_kmem",
74 .ckd_size = sizeof (struct vvp_session)
81 static void *vvp_key_init(const struct lu_context *ctx,
82 struct lu_context_key *key)
84 struct vvp_thread_info *info;
86 OBD_SLAB_ALLOC_PTR_GFP(info, vvp_thread_kmem, __GFP_IO);
88 info = ERR_PTR(-ENOMEM);
92 static void vvp_key_fini(const struct lu_context *ctx,
93 struct lu_context_key *key, void *data)
95 struct vvp_thread_info *info = data;
96 OBD_SLAB_FREE_PTR(info, vvp_thread_kmem);
99 static void *vvp_session_key_init(const struct lu_context *ctx,
100 struct lu_context_key *key)
102 struct vvp_session *session;
104 OBD_SLAB_ALLOC_PTR_GFP(session, vvp_session_kmem, __GFP_IO);
106 session = ERR_PTR(-ENOMEM);
110 static void vvp_session_key_fini(const struct lu_context *ctx,
111 struct lu_context_key *key, void *data)
113 struct vvp_session *session = data;
114 OBD_SLAB_FREE_PTR(session, vvp_session_kmem);
118 struct lu_context_key vvp_key = {
119 .lct_tags = LCT_CL_THREAD,
120 .lct_init = vvp_key_init,
121 .lct_fini = vvp_key_fini
124 struct lu_context_key vvp_session_key = {
125 .lct_tags = LCT_SESSION,
126 .lct_init = vvp_session_key_init,
127 .lct_fini = vvp_session_key_fini
130 /* type constructor/destructor: vvp_type_{init,fini,start,stop}(). */
131 LU_TYPE_INIT_FINI(vvp, &ccc_key, &ccc_session_key, &vvp_key, &vvp_session_key);
133 static const struct lu_device_operations vvp_lu_ops = {
134 .ldo_object_alloc = vvp_object_alloc
137 static const struct cl_device_operations vvp_cl_ops = {
138 .cdo_req_init = ccc_req_init
141 static struct lu_device *vvp_device_alloc(const struct lu_env *env,
142 struct lu_device_type *t,
143 struct lustre_cfg *cfg)
145 return ccc_device_alloc(env, t, cfg, &vvp_lu_ops, &vvp_cl_ops);
148 static const struct lu_device_type_operations vvp_device_type_ops = {
149 .ldto_init = vvp_type_init,
150 .ldto_fini = vvp_type_fini,
152 .ldto_start = vvp_type_start,
153 .ldto_stop = vvp_type_stop,
155 .ldto_device_alloc = vvp_device_alloc,
156 .ldto_device_free = ccc_device_free,
157 .ldto_device_init = ccc_device_init,
158 .ldto_device_fini = ccc_device_fini
161 struct lu_device_type vvp_device_type = {
162 .ldt_tags = LU_DEVICE_CL,
163 .ldt_name = LUSTRE_VVP_NAME,
164 .ldt_ops = &vvp_device_type_ops,
165 .ldt_ctx_tags = LCT_CL_THREAD
169 * A mutex serializing calls to vvp_inode_fini() under extreme memory
170 * pressure, when environments cannot be allocated.
172 int vvp_global_init(void)
176 result = lu_kmem_init(vvp_caches);
178 result = ccc_global_init(&vvp_device_type);
180 lu_kmem_fini(vvp_caches);
185 void vvp_global_fini(void)
187 ccc_global_fini(&vvp_device_type);
188 lu_kmem_fini(vvp_caches);
192 /*****************************************************************************
194 * mirror obd-devices into cl devices.
198 int cl_sb_init(struct super_block *sb)
200 struct ll_sb_info *sbi;
201 struct cl_device *cl;
207 env = cl_env_get(&refcheck);
209 cl = cl_type_setup(env, NULL, &vvp_device_type,
210 sbi->ll_dt_exp->exp_obd->obd_lu_dev);
212 cl2ccc_dev(cl)->cdv_sb = sb;
214 sbi->ll_site = cl2lu_dev(cl)->ld_site;
216 cl_env_put(env, &refcheck);
222 int cl_sb_fini(struct super_block *sb)
224 struct ll_sb_info *sbi;
226 struct cl_device *cld;
232 env = cl_env_get(&refcheck);
237 cl_stack_fini(env, cld);
241 cl_env_put(env, &refcheck);
244 CERROR("Cannot cleanup cl-stack due to memory shortage.\n");
245 result = PTR_ERR(env);
248 * If mount failed (sbi->ll_cl == NULL), and this there are no other
249 * mounts, stop device types manually (this usually happens
250 * automatically when last device is destroyed).
256 /****************************************************************************
258 * /proc/fs/lustre/llite/$MNT/dump_page_cache
260 ****************************************************************************/
263 * To represent contents of a page cache as a byte stream, following
264 * information if encoded in 64bit offset:
266 * - file hash bucket in lu_site::ls_hash[] 28bits
268 * - how far file is from bucket head 4bits
270 * - page index 32bits
272 * First two data identify a file in the cache uniquely.
275 #define PGC_OBJ_SHIFT (32 + 4)
276 #define PGC_DEPTH_SHIFT (32)
278 struct vvp_pgcache_id {
284 struct lu_object_header *vpi_obj;
287 static void vvp_pgcache_id_unpack(loff_t pos, struct vvp_pgcache_id *id)
289 CLASSERT(sizeof(pos) == sizeof(__u64));
291 id->vpi_index = pos & 0xffffffff;
292 id->vpi_depth = (pos >> PGC_DEPTH_SHIFT) & 0xf;
293 id->vpi_bucket = ((unsigned long long)pos >> PGC_OBJ_SHIFT);
296 static loff_t vvp_pgcache_id_pack(struct vvp_pgcache_id *id)
299 ((__u64)id->vpi_index) |
300 ((__u64)id->vpi_depth << PGC_DEPTH_SHIFT) |
301 ((__u64)id->vpi_bucket << PGC_OBJ_SHIFT);
304 static int vvp_pgcache_obj_get(cfs_hash_t *hs, cfs_hash_bd_t *bd,
305 cfs_hlist_node_t *hnode, void *data)
307 struct vvp_pgcache_id *id = data;
308 struct lu_object_header *hdr = cfs_hash_object(hs, hnode);
310 if (id->vpi_curdep-- > 0)
311 return 0; /* continue */
313 if (lu_object_is_dying(hdr))
316 cfs_hash_get(hs, hnode);
321 static struct cl_object *vvp_pgcache_obj(const struct lu_env *env,
322 struct lu_device *dev,
323 struct vvp_pgcache_id *id)
325 LASSERT(lu_device_is_cl(dev));
327 id->vpi_depth &= 0xf;
329 id->vpi_curdep = id->vpi_depth;
331 cfs_hash_hlist_for_each(dev->ld_site->ls_obj_hash, id->vpi_bucket,
332 vvp_pgcache_obj_get, id);
333 if (id->vpi_obj != NULL) {
334 struct lu_object *lu_obj;
336 lu_obj = lu_object_locate(id->vpi_obj, dev->ld_type);
337 if (lu_obj != NULL) {
338 lu_object_ref_add(lu_obj, "dump", current);
339 return lu2cl(lu_obj);
341 lu_object_put(env, lu_object_top(id->vpi_obj));
343 } else if (id->vpi_curdep > 0) {
349 static loff_t vvp_pgcache_find(const struct lu_env *env,
350 struct lu_device *dev, loff_t pos)
352 struct cl_object *clob;
353 struct lu_site *site;
354 struct vvp_pgcache_id id;
357 vvp_pgcache_id_unpack(pos, &id);
360 if (id.vpi_bucket >= CFS_HASH_NHLIST(site->ls_obj_hash))
362 clob = vvp_pgcache_obj(env, dev, &id);
364 struct cl_object_header *hdr;
368 /* got an object. Find next page. */
369 hdr = cl_object_header(clob);
371 spin_lock(&hdr->coh_page_guard);
372 nr = radix_tree_gang_lookup(&hdr->coh_tree,
376 id.vpi_index = pg->cp_index;
377 /* Cant support over 16T file */
378 nr = !(pg->cp_index > 0xffffffff);
380 spin_unlock(&hdr->coh_page_guard);
382 lu_object_ref_del(&clob->co_lu, "dump", current);
383 cl_object_put(env, clob);
385 return vvp_pgcache_id_pack(&id);
387 /* to the next object. */
390 if (id.vpi_depth == 0 && ++id.vpi_bucket == 0)
396 #define seq_page_flag(seq, page, flag, has_flags) do { \
397 if (test_bit(PG_##flag, &(page)->flags)) { \
398 seq_printf(seq, "%s"#flag, has_flags ? "|" : ""); \
403 static void vvp_pgcache_page_show(const struct lu_env *env,
404 struct seq_file *seq, struct cl_page *page)
406 struct ccc_page *cpg;
410 cpg = cl2ccc_page(cl_page_at(page, &vvp_device_type));
411 vmpage = cpg->cpg_page;
412 seq_printf(seq," %5i | %p %p %s %s %s %s | %p %lu/%u(%p) %lu %u [",
416 cpg->cpg_write_queued ? "wq" : "- ",
417 cpg->cpg_defer_uptodate ? "du" : "- ",
418 PageWriteback(vmpage) ? "wb" : "-",
419 vmpage, vmpage->mapping->host->i_ino,
420 vmpage->mapping->host->i_generation,
421 vmpage->mapping->host, vmpage->index,
424 seq_page_flag(seq, vmpage, locked, has_flags);
425 seq_page_flag(seq, vmpage, error, has_flags);
426 seq_page_flag(seq, vmpage, referenced, has_flags);
427 seq_page_flag(seq, vmpage, uptodate, has_flags);
428 seq_page_flag(seq, vmpage, dirty, has_flags);
429 seq_page_flag(seq, vmpage, writeback, has_flags);
430 seq_printf(seq, "%s]\n", has_flags ? "" : "-");
433 static int vvp_pgcache_show(struct seq_file *f, void *v)
436 struct ll_sb_info *sbi;
437 struct cl_object *clob;
439 struct cl_page *page;
440 struct cl_object_header *hdr;
441 struct vvp_pgcache_id id;
445 env = cl_env_get(&refcheck);
448 vvp_pgcache_id_unpack(pos, &id);
450 clob = vvp_pgcache_obj(env, &sbi->ll_cl->cd_lu_dev, &id);
452 hdr = cl_object_header(clob);
454 spin_lock(&hdr->coh_page_guard);
455 page = cl_page_lookup(hdr, id.vpi_index);
457 seq_printf(f, "%8x@"DFID": ",
458 id.vpi_index, PFID(&hdr->coh_lu.loh_fid));
460 vvp_pgcache_page_show(env, f, page);
461 cl_page_put(env, page);
463 seq_puts(f, "missing\n");
464 spin_unlock(&hdr->coh_page_guard);
465 lu_object_ref_del(&clob->co_lu, "dump", current);
466 cl_object_put(env, clob);
468 seq_printf(f, "%llx missing\n", pos);
469 cl_env_put(env, &refcheck);
472 result = PTR_ERR(env);
476 static void *vvp_pgcache_start(struct seq_file *f, loff_t *pos)
478 struct ll_sb_info *sbi;
484 env = cl_env_get(&refcheck);
487 if (sbi->ll_site->ls_obj_hash->hs_cur_bits > 64 - PGC_OBJ_SHIFT)
488 pos = ERR_PTR(-EFBIG);
490 *pos = vvp_pgcache_find(env, &sbi->ll_cl->cd_lu_dev,
495 cl_env_put(env, &refcheck);
500 static void *vvp_pgcache_next(struct seq_file *f, void *v, loff_t *pos)
502 struct ll_sb_info *sbi;
506 env = cl_env_get(&refcheck);
509 *pos = vvp_pgcache_find(env, &sbi->ll_cl->cd_lu_dev, *pos + 1);
512 cl_env_put(env, &refcheck);
517 static void vvp_pgcache_stop(struct seq_file *f, void *v)
522 static struct seq_operations vvp_pgcache_ops = {
523 .start = vvp_pgcache_start,
524 .next = vvp_pgcache_next,
525 .stop = vvp_pgcache_stop,
526 .show = vvp_pgcache_show
529 static int vvp_dump_pgcache_seq_open(struct inode *inode, struct file *filp)
531 struct proc_dir_entry *dp = PDE(inode);
532 struct ll_sb_info *sbi = dp->data;
533 struct seq_file *seq;
536 result = seq_open(filp, &vvp_pgcache_ops);
538 seq = filp->private_data;
544 struct file_operations vvp_dump_pgcache_file_ops = {
545 .owner = THIS_MODULE,
546 .open = vvp_dump_pgcache_seq_open,
549 .release = seq_release,