| /* |
| * GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License version 2 for more details (a copy is included |
| * in the LICENSE file that accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see |
| * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| * |
| * Copyright (c) 2012, Intel Corporation. |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| * |
| * cl_device and cl_device_type implementation for VVP layer. |
| * |
| * Author: Nikita Danilov <nikita.danilov@sun.com> |
| */ |
| |
| #define DEBUG_SUBSYSTEM S_LLITE |
| |
| |
| #include <obd.h> |
| #include <lustre_lite.h> |
| |
| #include "vvp_internal.h" |
| |
| /***************************************************************************** |
| * |
| * Vvp device and device type functions. |
| * |
| */ |
| |
| /* |
| * vvp_ prefix stands for "Vfs Vm Posix". It corresponds to historical |
| * "llite_" (var. "ll_") prefix. |
| */ |
| |
| struct kmem_cache *vvp_thread_kmem; |
| static struct kmem_cache *vvp_session_kmem; |
| static struct lu_kmem_descr vvp_caches[] = { |
| { |
| .ckd_cache = &vvp_thread_kmem, |
| .ckd_name = "vvp_thread_kmem", |
| .ckd_size = sizeof (struct vvp_thread_info), |
| }, |
| { |
| .ckd_cache = &vvp_session_kmem, |
| .ckd_name = "vvp_session_kmem", |
| .ckd_size = sizeof (struct vvp_session) |
| }, |
| { |
| .ckd_cache = NULL |
| } |
| }; |
| |
| static void *vvp_key_init(const struct lu_context *ctx, |
| struct lu_context_key *key) |
| { |
| struct vvp_thread_info *info; |
| |
| OBD_SLAB_ALLOC_PTR_GFP(info, vvp_thread_kmem, __GFP_IO); |
| if (info == NULL) |
| info = ERR_PTR(-ENOMEM); |
| return info; |
| } |
| |
| static void vvp_key_fini(const struct lu_context *ctx, |
| struct lu_context_key *key, void *data) |
| { |
| struct vvp_thread_info *info = data; |
| OBD_SLAB_FREE_PTR(info, vvp_thread_kmem); |
| } |
| |
| static void *vvp_session_key_init(const struct lu_context *ctx, |
| struct lu_context_key *key) |
| { |
| struct vvp_session *session; |
| |
| OBD_SLAB_ALLOC_PTR_GFP(session, vvp_session_kmem, __GFP_IO); |
| if (session == NULL) |
| session = ERR_PTR(-ENOMEM); |
| return session; |
| } |
| |
| static void vvp_session_key_fini(const struct lu_context *ctx, |
| struct lu_context_key *key, void *data) |
| { |
| struct vvp_session *session = data; |
| OBD_SLAB_FREE_PTR(session, vvp_session_kmem); |
| } |
| |
| |
| struct lu_context_key vvp_key = { |
| .lct_tags = LCT_CL_THREAD, |
| .lct_init = vvp_key_init, |
| .lct_fini = vvp_key_fini |
| }; |
| |
| struct lu_context_key vvp_session_key = { |
| .lct_tags = LCT_SESSION, |
| .lct_init = vvp_session_key_init, |
| .lct_fini = vvp_session_key_fini |
| }; |
| |
| /* type constructor/destructor: vvp_type_{init,fini,start,stop}(). */ |
| LU_TYPE_INIT_FINI(vvp, &ccc_key, &ccc_session_key, &vvp_key, &vvp_session_key); |
| |
| static const struct lu_device_operations vvp_lu_ops = { |
| .ldo_object_alloc = vvp_object_alloc |
| }; |
| |
| static const struct cl_device_operations vvp_cl_ops = { |
| .cdo_req_init = ccc_req_init |
| }; |
| |
| static struct lu_device *vvp_device_alloc(const struct lu_env *env, |
| struct lu_device_type *t, |
| struct lustre_cfg *cfg) |
| { |
| return ccc_device_alloc(env, t, cfg, &vvp_lu_ops, &vvp_cl_ops); |
| } |
| |
| static const struct lu_device_type_operations vvp_device_type_ops = { |
| .ldto_init = vvp_type_init, |
| .ldto_fini = vvp_type_fini, |
| |
| .ldto_start = vvp_type_start, |
| .ldto_stop = vvp_type_stop, |
| |
| .ldto_device_alloc = vvp_device_alloc, |
| .ldto_device_free = ccc_device_free, |
| .ldto_device_init = ccc_device_init, |
| .ldto_device_fini = ccc_device_fini |
| }; |
| |
| struct lu_device_type vvp_device_type = { |
| .ldt_tags = LU_DEVICE_CL, |
| .ldt_name = LUSTRE_VVP_NAME, |
| .ldt_ops = &vvp_device_type_ops, |
| .ldt_ctx_tags = LCT_CL_THREAD |
| }; |
| |
| /** |
| * A mutex serializing calls to vvp_inode_fini() under extreme memory |
| * pressure, when environments cannot be allocated. |
| */ |
| int vvp_global_init(void) |
| { |
| int result; |
| |
| result = lu_kmem_init(vvp_caches); |
| if (result == 0) { |
| result = ccc_global_init(&vvp_device_type); |
| if (result != 0) |
| lu_kmem_fini(vvp_caches); |
| } |
| return result; |
| } |
| |
| void vvp_global_fini(void) |
| { |
| ccc_global_fini(&vvp_device_type); |
| lu_kmem_fini(vvp_caches); |
| } |
| |
| |
| /***************************************************************************** |
| * |
| * mirror obd-devices into cl devices. |
| * |
| */ |
| |
| int cl_sb_init(struct super_block *sb) |
| { |
| struct ll_sb_info *sbi; |
| struct cl_device *cl; |
| struct lu_env *env; |
| int rc = 0; |
| int refcheck; |
| |
| sbi = ll_s2sbi(sb); |
| env = cl_env_get(&refcheck); |
| if (!IS_ERR(env)) { |
| cl = cl_type_setup(env, NULL, &vvp_device_type, |
| sbi->ll_dt_exp->exp_obd->obd_lu_dev); |
| if (!IS_ERR(cl)) { |
| cl2ccc_dev(cl)->cdv_sb = sb; |
| sbi->ll_cl = cl; |
| sbi->ll_site = cl2lu_dev(cl)->ld_site; |
| } |
| cl_env_put(env, &refcheck); |
| } else |
| rc = PTR_ERR(env); |
| return rc; |
| } |
| |
| int cl_sb_fini(struct super_block *sb) |
| { |
| struct ll_sb_info *sbi; |
| struct lu_env *env; |
| struct cl_device *cld; |
| int refcheck; |
| int result; |
| |
| sbi = ll_s2sbi(sb); |
| env = cl_env_get(&refcheck); |
| if (!IS_ERR(env)) { |
| cld = sbi->ll_cl; |
| |
| if (cld != NULL) { |
| cl_stack_fini(env, cld); |
| sbi->ll_cl = NULL; |
| sbi->ll_site = NULL; |
| } |
| cl_env_put(env, &refcheck); |
| result = 0; |
| } else { |
| CERROR("Cannot cleanup cl-stack due to memory shortage.\n"); |
| result = PTR_ERR(env); |
| } |
| /* |
| * If mount failed (sbi->ll_cl == NULL), and this there are no other |
| * mounts, stop device types manually (this usually happens |
| * automatically when last device is destroyed). |
| */ |
| lu_types_stop(); |
| return result; |
| } |
| |
| /**************************************************************************** |
| * |
| * /proc/fs/lustre/llite/$MNT/dump_page_cache |
| * |
| ****************************************************************************/ |
| |
| /* |
| * To represent contents of a page cache as a byte stream, following |
| * information if encoded in 64bit offset: |
| * |
| * - file hash bucket in lu_site::ls_hash[] 28bits |
| * |
| * - how far file is from bucket head 4bits |
| * |
| * - page index 32bits |
| * |
| * First two data identify a file in the cache uniquely. |
| */ |
| |
| #define PGC_OBJ_SHIFT (32 + 4) |
| #define PGC_DEPTH_SHIFT (32) |
| |
| struct vvp_pgcache_id { |
| unsigned vpi_bucket; |
| unsigned vpi_depth; |
| uint32_t vpi_index; |
| |
| unsigned vpi_curdep; |
| struct lu_object_header *vpi_obj; |
| }; |
| |
| static void vvp_pgcache_id_unpack(loff_t pos, struct vvp_pgcache_id *id) |
| { |
| CLASSERT(sizeof(pos) == sizeof(__u64)); |
| |
| id->vpi_index = pos & 0xffffffff; |
| id->vpi_depth = (pos >> PGC_DEPTH_SHIFT) & 0xf; |
| id->vpi_bucket = ((unsigned long long)pos >> PGC_OBJ_SHIFT); |
| } |
| |
| static loff_t vvp_pgcache_id_pack(struct vvp_pgcache_id *id) |
| { |
| return |
| ((__u64)id->vpi_index) | |
| ((__u64)id->vpi_depth << PGC_DEPTH_SHIFT) | |
| ((__u64)id->vpi_bucket << PGC_OBJ_SHIFT); |
| } |
| |
| static int vvp_pgcache_obj_get(cfs_hash_t *hs, cfs_hash_bd_t *bd, |
| struct hlist_node *hnode, void *data) |
| { |
| struct vvp_pgcache_id *id = data; |
| struct lu_object_header *hdr = cfs_hash_object(hs, hnode); |
| |
| if (id->vpi_curdep-- > 0) |
| return 0; /* continue */ |
| |
| if (lu_object_is_dying(hdr)) |
| return 1; |
| |
| cfs_hash_get(hs, hnode); |
| id->vpi_obj = hdr; |
| return 1; |
| } |
| |
| static struct cl_object *vvp_pgcache_obj(const struct lu_env *env, |
| struct lu_device *dev, |
| struct vvp_pgcache_id *id) |
| { |
| LASSERT(lu_device_is_cl(dev)); |
| |
| id->vpi_depth &= 0xf; |
| id->vpi_obj = NULL; |
| id->vpi_curdep = id->vpi_depth; |
| |
| cfs_hash_hlist_for_each(dev->ld_site->ls_obj_hash, id->vpi_bucket, |
| vvp_pgcache_obj_get, id); |
| if (id->vpi_obj != NULL) { |
| struct lu_object *lu_obj; |
| |
| lu_obj = lu_object_locate(id->vpi_obj, dev->ld_type); |
| if (lu_obj != NULL) { |
| lu_object_ref_add(lu_obj, "dump", current); |
| return lu2cl(lu_obj); |
| } |
| lu_object_put(env, lu_object_top(id->vpi_obj)); |
| |
| } else if (id->vpi_curdep > 0) { |
| id->vpi_depth = 0xf; |
| } |
| return NULL; |
| } |
| |
| static loff_t vvp_pgcache_find(const struct lu_env *env, |
| struct lu_device *dev, loff_t pos) |
| { |
| struct cl_object *clob; |
| struct lu_site *site; |
| struct vvp_pgcache_id id; |
| |
| site = dev->ld_site; |
| vvp_pgcache_id_unpack(pos, &id); |
| |
| while (1) { |
| if (id.vpi_bucket >= CFS_HASH_NHLIST(site->ls_obj_hash)) |
| return ~0ULL; |
| clob = vvp_pgcache_obj(env, dev, &id); |
| if (clob != NULL) { |
| struct cl_object_header *hdr; |
| int nr; |
| struct cl_page *pg; |
| |
| /* got an object. Find next page. */ |
| hdr = cl_object_header(clob); |
| |
| spin_lock(&hdr->coh_page_guard); |
| nr = radix_tree_gang_lookup(&hdr->coh_tree, |
| (void **)&pg, |
| id.vpi_index, 1); |
| if (nr > 0) { |
| id.vpi_index = pg->cp_index; |
| /* Cant support over 16T file */ |
| nr = !(pg->cp_index > 0xffffffff); |
| } |
| spin_unlock(&hdr->coh_page_guard); |
| |
| lu_object_ref_del(&clob->co_lu, "dump", current); |
| cl_object_put(env, clob); |
| if (nr > 0) |
| return vvp_pgcache_id_pack(&id); |
| } |
| /* to the next object. */ |
| ++id.vpi_depth; |
| id.vpi_depth &= 0xf; |
| if (id.vpi_depth == 0 && ++id.vpi_bucket == 0) |
| return ~0ULL; |
| id.vpi_index = 0; |
| } |
| } |
| |
| #define seq_page_flag(seq, page, flag, has_flags) do { \ |
| if (test_bit(PG_##flag, &(page)->flags)) { \ |
| seq_printf(seq, "%s"#flag, has_flags ? "|" : ""); \ |
| has_flags = 1; \ |
| } \ |
| } while(0) |
| |
| static void vvp_pgcache_page_show(const struct lu_env *env, |
| struct seq_file *seq, struct cl_page *page) |
| { |
| struct ccc_page *cpg; |
| struct page *vmpage; |
| int has_flags; |
| |
| cpg = cl2ccc_page(cl_page_at(page, &vvp_device_type)); |
| vmpage = cpg->cpg_page; |
| seq_printf(seq," %5i | %p %p %s %s %s %s | %p %lu/%u(%p) %lu %u [", |
| 0 /* gen */, |
| cpg, page, |
| "none", |
| cpg->cpg_write_queued ? "wq" : "- ", |
| cpg->cpg_defer_uptodate ? "du" : "- ", |
| PageWriteback(vmpage) ? "wb" : "-", |
| vmpage, vmpage->mapping->host->i_ino, |
| vmpage->mapping->host->i_generation, |
| vmpage->mapping->host, vmpage->index, |
| page_count(vmpage)); |
| has_flags = 0; |
| seq_page_flag(seq, vmpage, locked, has_flags); |
| seq_page_flag(seq, vmpage, error, has_flags); |
| seq_page_flag(seq, vmpage, referenced, has_flags); |
| seq_page_flag(seq, vmpage, uptodate, has_flags); |
| seq_page_flag(seq, vmpage, dirty, has_flags); |
| seq_page_flag(seq, vmpage, writeback, has_flags); |
| seq_printf(seq, "%s]\n", has_flags ? "" : "-"); |
| } |
| |
| static int vvp_pgcache_show(struct seq_file *f, void *v) |
| { |
| loff_t pos; |
| struct ll_sb_info *sbi; |
| struct cl_object *clob; |
| struct lu_env *env; |
| struct cl_page *page; |
| struct cl_object_header *hdr; |
| struct vvp_pgcache_id id; |
| int refcheck; |
| int result; |
| |
| env = cl_env_get(&refcheck); |
| if (!IS_ERR(env)) { |
| pos = *(loff_t *) v; |
| vvp_pgcache_id_unpack(pos, &id); |
| sbi = f->private; |
| clob = vvp_pgcache_obj(env, &sbi->ll_cl->cd_lu_dev, &id); |
| if (clob != NULL) { |
| hdr = cl_object_header(clob); |
| |
| spin_lock(&hdr->coh_page_guard); |
| page = cl_page_lookup(hdr, id.vpi_index); |
| spin_unlock(&hdr->coh_page_guard); |
| |
| seq_printf(f, "%8x@"DFID": ", |
| id.vpi_index, PFID(&hdr->coh_lu.loh_fid)); |
| if (page != NULL) { |
| vvp_pgcache_page_show(env, f, page); |
| cl_page_put(env, page); |
| } else |
| seq_puts(f, "missing\n"); |
| lu_object_ref_del(&clob->co_lu, "dump", current); |
| cl_object_put(env, clob); |
| } else |
| seq_printf(f, "%llx missing\n", pos); |
| cl_env_put(env, &refcheck); |
| result = 0; |
| } else |
| result = PTR_ERR(env); |
| return result; |
| } |
| |
| static void *vvp_pgcache_start(struct seq_file *f, loff_t *pos) |
| { |
| struct ll_sb_info *sbi; |
| struct lu_env *env; |
| int refcheck; |
| |
| sbi = f->private; |
| |
| env = cl_env_get(&refcheck); |
| if (!IS_ERR(env)) { |
| sbi = f->private; |
| if (sbi->ll_site->ls_obj_hash->hs_cur_bits > 64 - PGC_OBJ_SHIFT) |
| pos = ERR_PTR(-EFBIG); |
| else { |
| *pos = vvp_pgcache_find(env, &sbi->ll_cl->cd_lu_dev, |
| *pos); |
| if (*pos == ~0ULL) |
| pos = NULL; |
| } |
| cl_env_put(env, &refcheck); |
| } |
| return pos; |
| } |
| |
| static void *vvp_pgcache_next(struct seq_file *f, void *v, loff_t *pos) |
| { |
| struct ll_sb_info *sbi; |
| struct lu_env *env; |
| int refcheck; |
| |
| env = cl_env_get(&refcheck); |
| if (!IS_ERR(env)) { |
| sbi = f->private; |
| *pos = vvp_pgcache_find(env, &sbi->ll_cl->cd_lu_dev, *pos + 1); |
| if (*pos == ~0ULL) |
| pos = NULL; |
| cl_env_put(env, &refcheck); |
| } |
| return pos; |
| } |
| |
| static void vvp_pgcache_stop(struct seq_file *f, void *v) |
| { |
| /* Nothing to do */ |
| } |
| |
| static struct seq_operations vvp_pgcache_ops = { |
| .start = vvp_pgcache_start, |
| .next = vvp_pgcache_next, |
| .stop = vvp_pgcache_stop, |
| .show = vvp_pgcache_show |
| }; |
| |
| static int vvp_dump_pgcache_seq_open(struct inode *inode, struct file *filp) |
| { |
| struct ll_sb_info *sbi = PDE_DATA(inode); |
| struct seq_file *seq; |
| int result; |
| |
| result = seq_open(filp, &vvp_pgcache_ops); |
| if (result == 0) { |
| seq = filp->private_data; |
| seq->private = sbi; |
| } |
| return result; |
| } |
| |
| struct file_operations vvp_dump_pgcache_file_ops = { |
| .owner = THIS_MODULE, |
| .open = vvp_dump_pgcache_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |