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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_NOFS);
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_NOFS);
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);
251 /****************************************************************************
253 * /proc/fs/lustre/llite/$MNT/dump_page_cache
255 ****************************************************************************/
258 * To represent contents of a page cache as a byte stream, following
259 * information if encoded in 64bit offset:
261 * - file hash bucket in lu_site::ls_hash[] 28bits
263 * - how far file is from bucket head 4bits
265 * - page index 32bits
267 * First two data identify a file in the cache uniquely.
270 #define PGC_OBJ_SHIFT (32 + 4)
271 #define PGC_DEPTH_SHIFT (32)
273 struct vvp_pgcache_id {
279 struct lu_object_header *vpi_obj;
282 static void vvp_pgcache_id_unpack(loff_t pos, struct vvp_pgcache_id *id)
284 CLASSERT(sizeof(pos) == sizeof(__u64));
286 id->vpi_index = pos & 0xffffffff;
287 id->vpi_depth = (pos >> PGC_DEPTH_SHIFT) & 0xf;
288 id->vpi_bucket = ((unsigned long long)pos >> PGC_OBJ_SHIFT);
291 static loff_t vvp_pgcache_id_pack(struct vvp_pgcache_id *id)
294 ((__u64)id->vpi_index) |
295 ((__u64)id->vpi_depth << PGC_DEPTH_SHIFT) |
296 ((__u64)id->vpi_bucket << PGC_OBJ_SHIFT);
299 static int vvp_pgcache_obj_get(cfs_hash_t *hs, cfs_hash_bd_t *bd,
300 cfs_hlist_node_t *hnode, void *data)
302 struct vvp_pgcache_id *id = data;
303 struct lu_object_header *hdr = cfs_hash_object(hs, hnode);
305 if (id->vpi_curdep-- > 0)
306 return 0; /* continue */
308 if (lu_object_is_dying(hdr))
311 cfs_hash_get(hs, hnode);
316 static struct cl_object *vvp_pgcache_obj(const struct lu_env *env,
317 struct lu_device *dev,
318 struct vvp_pgcache_id *id)
320 LASSERT(lu_device_is_cl(dev));
322 id->vpi_depth &= 0xf;
324 id->vpi_curdep = id->vpi_depth;
326 cfs_hash_hlist_for_each(dev->ld_site->ls_obj_hash, id->vpi_bucket,
327 vvp_pgcache_obj_get, id);
328 if (id->vpi_obj != NULL) {
329 struct lu_object *lu_obj;
331 lu_obj = lu_object_locate(id->vpi_obj, dev->ld_type);
332 if (lu_obj != NULL) {
333 lu_object_ref_add(lu_obj, "dump", current);
334 return lu2cl(lu_obj);
336 lu_object_put(env, lu_object_top(id->vpi_obj));
338 } else if (id->vpi_curdep > 0) {
344 static loff_t vvp_pgcache_find(const struct lu_env *env,
345 struct lu_device *dev, loff_t pos)
347 struct cl_object *clob;
348 struct lu_site *site;
349 struct vvp_pgcache_id id;
352 vvp_pgcache_id_unpack(pos, &id);
355 if (id.vpi_bucket >= CFS_HASH_NHLIST(site->ls_obj_hash))
357 clob = vvp_pgcache_obj(env, dev, &id);
359 struct cl_object_header *hdr;
363 /* got an object. Find next page. */
364 hdr = cl_object_header(clob);
366 spin_lock(&hdr->coh_page_guard);
367 nr = radix_tree_gang_lookup(&hdr->coh_tree,
371 id.vpi_index = pg->cp_index;
372 /* Cant support over 16T file */
373 nr = !(pg->cp_index > 0xffffffff);
375 spin_unlock(&hdr->coh_page_guard);
377 lu_object_ref_del(&clob->co_lu, "dump", current);
378 cl_object_put(env, clob);
380 return vvp_pgcache_id_pack(&id);
382 /* to the next object. */
385 if (id.vpi_depth == 0 && ++id.vpi_bucket == 0)
391 #define seq_page_flag(seq, page, flag, has_flags) do { \
392 if (test_bit(PG_##flag, &(page)->flags)) { \
393 seq_printf(seq, "%s"#flag, has_flags ? "|" : ""); \
398 static void vvp_pgcache_page_show(const struct lu_env *env,
399 struct seq_file *seq, struct cl_page *page)
401 struct ccc_page *cpg;
405 cpg = cl2ccc_page(cl_page_at(page, &vvp_device_type));
406 vmpage = cpg->cpg_page;
407 seq_printf(seq," %5i | %p %p %s %s %s %s | %p %lu/%u(%p) %lu %u [",
411 cpg->cpg_write_queued ? "wq" : "- ",
412 cpg->cpg_defer_uptodate ? "du" : "- ",
413 PageWriteback(vmpage) ? "wb" : "-",
414 vmpage, vmpage->mapping->host->i_ino,
415 vmpage->mapping->host->i_generation,
416 vmpage->mapping->host, vmpage->index,
419 seq_page_flag(seq, vmpage, locked, has_flags);
420 seq_page_flag(seq, vmpage, error, has_flags);
421 seq_page_flag(seq, vmpage, referenced, has_flags);
422 seq_page_flag(seq, vmpage, uptodate, has_flags);
423 seq_page_flag(seq, vmpage, dirty, has_flags);
424 seq_page_flag(seq, vmpage, writeback, has_flags);
425 seq_printf(seq, "%s]\n", has_flags ? "" : "-");
428 static int vvp_pgcache_show(struct seq_file *f, void *v)
431 struct ll_sb_info *sbi;
432 struct cl_object *clob;
434 struct cl_page *page;
435 struct cl_object_header *hdr;
436 struct vvp_pgcache_id id;
440 env = cl_env_get(&refcheck);
443 vvp_pgcache_id_unpack(pos, &id);
445 clob = vvp_pgcache_obj(env, &sbi->ll_cl->cd_lu_dev, &id);
447 hdr = cl_object_header(clob);
449 spin_lock(&hdr->coh_page_guard);
450 page = cl_page_lookup(hdr, id.vpi_index);
452 seq_printf(f, "%8x@"DFID": ",
453 id.vpi_index, PFID(&hdr->coh_lu.loh_fid));
455 vvp_pgcache_page_show(env, f, page);
456 cl_page_put(env, page);
458 seq_puts(f, "missing\n");
459 spin_unlock(&hdr->coh_page_guard);
460 lu_object_ref_del(&clob->co_lu, "dump", current);
461 cl_object_put(env, clob);
463 seq_printf(f, "%llx missing\n", pos);
464 cl_env_put(env, &refcheck);
467 result = PTR_ERR(env);
471 static void *vvp_pgcache_start(struct seq_file *f, loff_t *pos)
473 struct ll_sb_info *sbi;
479 env = cl_env_get(&refcheck);
482 if (sbi->ll_site->ls_obj_hash->hs_cur_bits > 64 - PGC_OBJ_SHIFT)
483 pos = ERR_PTR(-EFBIG);
485 *pos = vvp_pgcache_find(env, &sbi->ll_cl->cd_lu_dev,
490 cl_env_put(env, &refcheck);
495 static void *vvp_pgcache_next(struct seq_file *f, void *v, loff_t *pos)
497 struct ll_sb_info *sbi;
501 env = cl_env_get(&refcheck);
504 *pos = vvp_pgcache_find(env, &sbi->ll_cl->cd_lu_dev, *pos + 1);
507 cl_env_put(env, &refcheck);
512 static void vvp_pgcache_stop(struct seq_file *f, void *v)
517 static struct seq_operations vvp_pgcache_ops = {
518 .start = vvp_pgcache_start,
519 .next = vvp_pgcache_next,
520 .stop = vvp_pgcache_stop,
521 .show = vvp_pgcache_show
524 static int vvp_dump_pgcache_seq_open(struct inode *inode, struct file *filp)
526 struct proc_dir_entry *dp = PDE(inode);
527 struct ll_sb_info *sbi = dp->data;
528 struct seq_file *seq;
531 result = seq_open(filp, &vvp_pgcache_ops);
533 seq = filp->private_data;
539 struct file_operations vvp_dump_pgcache_file_ops = {
540 .owner = THIS_MODULE,
541 .open = vvp_dump_pgcache_seq_open,
544 .release = seq_release,