| /* |
| * 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, 2015, 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> |
| * Author: Jinshan Xiong <jinshan.xiong@intel.com> |
| */ |
| |
| #define DEBUG_SUBSYSTEM S_LLITE |
| |
| #include "../include/obd.h" |
| #include "../include/lustre_lite.h" |
| #include "llite_internal.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. |
| */ |
| |
| static struct kmem_cache *ll_thread_kmem; |
| struct kmem_cache *vvp_lock_kmem; |
| struct kmem_cache *vvp_object_kmem; |
| struct kmem_cache *vvp_req_kmem; |
| static struct kmem_cache *vvp_session_kmem; |
| static struct kmem_cache *vvp_thread_kmem; |
| |
| static struct lu_kmem_descr vvp_caches[] = { |
| { |
| .ckd_cache = &ll_thread_kmem, |
| .ckd_name = "ll_thread_kmem", |
| .ckd_size = sizeof(struct ll_thread_info), |
| }, |
| { |
| .ckd_cache = &vvp_lock_kmem, |
| .ckd_name = "vvp_lock_kmem", |
| .ckd_size = sizeof(struct vvp_lock), |
| }, |
| { |
| .ckd_cache = &vvp_object_kmem, |
| .ckd_name = "vvp_object_kmem", |
| .ckd_size = sizeof(struct vvp_object), |
| }, |
| { |
| .ckd_cache = &vvp_req_kmem, |
| .ckd_name = "vvp_req_kmem", |
| .ckd_size = sizeof(struct vvp_req), |
| }, |
| { |
| .ckd_cache = &vvp_session_kmem, |
| .ckd_name = "vvp_session_kmem", |
| .ckd_size = sizeof(struct vvp_session) |
| }, |
| { |
| .ckd_cache = &vvp_thread_kmem, |
| .ckd_name = "vvp_thread_kmem", |
| .ckd_size = sizeof(struct vvp_thread_info), |
| }, |
| { |
| .ckd_cache = NULL |
| } |
| }; |
| |
| static void *ll_thread_key_init(const struct lu_context *ctx, |
| struct lu_context_key *key) |
| { |
| struct vvp_thread_info *info; |
| |
| info = kmem_cache_zalloc(ll_thread_kmem, GFP_NOFS); |
| if (!info) |
| info = ERR_PTR(-ENOMEM); |
| return info; |
| } |
| |
| static void ll_thread_key_fini(const struct lu_context *ctx, |
| struct lu_context_key *key, void *data) |
| { |
| struct vvp_thread_info *info = data; |
| |
| kmem_cache_free(ll_thread_kmem, info); |
| } |
| |
| struct lu_context_key ll_thread_key = { |
| .lct_tags = LCT_CL_THREAD, |
| .lct_init = ll_thread_key_init, |
| .lct_fini = ll_thread_key_fini |
| }; |
| |
| static void *vvp_session_key_init(const struct lu_context *ctx, |
| struct lu_context_key *key) |
| { |
| struct vvp_session *session; |
| |
| session = kmem_cache_zalloc(vvp_session_kmem, GFP_NOFS); |
| if (!session) |
| 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; |
| |
| kmem_cache_free(vvp_session_kmem, session); |
| } |
| |
| struct lu_context_key vvp_session_key = { |
| .lct_tags = LCT_SESSION, |
| .lct_init = vvp_session_key_init, |
| .lct_fini = vvp_session_key_fini |
| }; |
| |
| void *vvp_thread_key_init(const struct lu_context *ctx, |
| struct lu_context_key *key) |
| { |
| struct vvp_thread_info *vti; |
| |
| vti = kmem_cache_zalloc(vvp_thread_kmem, GFP_NOFS); |
| if (!vti) |
| vti = ERR_PTR(-ENOMEM); |
| return vti; |
| } |
| |
| void vvp_thread_key_fini(const struct lu_context *ctx, |
| struct lu_context_key *key, void *data) |
| { |
| struct vvp_thread_info *vti = data; |
| |
| kmem_cache_free(vvp_thread_kmem, vti); |
| } |
| |
| struct lu_context_key vvp_thread_key = { |
| .lct_tags = LCT_CL_THREAD, |
| .lct_init = vvp_thread_key_init, |
| .lct_fini = vvp_thread_key_fini |
| }; |
| |
| /* type constructor/destructor: vvp_type_{init,fini,start,stop}(). */ |
| LU_TYPE_INIT_FINI(vvp, &vvp_thread_key, &ll_thread_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 = vvp_req_init |
| }; |
| |
| static struct lu_device *vvp_device_free(const struct lu_env *env, |
| struct lu_device *d) |
| { |
| struct vvp_device *vdv = lu2vvp_dev(d); |
| struct cl_site *site = lu2cl_site(d->ld_site); |
| struct lu_device *next = cl2lu_dev(vdv->vdv_next); |
| |
| if (d->ld_site) { |
| cl_site_fini(site); |
| kfree(site); |
| } |
| cl_device_fini(lu2cl_dev(d)); |
| kfree(vdv); |
| return next; |
| } |
| |
| static struct lu_device *vvp_device_alloc(const struct lu_env *env, |
| struct lu_device_type *t, |
| struct lustre_cfg *cfg) |
| { |
| struct vvp_device *vdv; |
| struct lu_device *lud; |
| struct cl_site *site; |
| int rc; |
| |
| vdv = kzalloc(sizeof(*vdv), GFP_NOFS); |
| if (!vdv) |
| return ERR_PTR(-ENOMEM); |
| |
| lud = &vdv->vdv_cl.cd_lu_dev; |
| cl_device_init(&vdv->vdv_cl, t); |
| vvp2lu_dev(vdv)->ld_ops = &vvp_lu_ops; |
| vdv->vdv_cl.cd_ops = &vvp_cl_ops; |
| |
| site = kzalloc(sizeof(*site), GFP_NOFS); |
| if (site) { |
| rc = cl_site_init(site, &vdv->vdv_cl); |
| if (rc == 0) { |
| rc = lu_site_init_finish(&site->cs_lu); |
| } else { |
| LASSERT(!lud->ld_site); |
| CERROR("Cannot init lu_site, rc %d.\n", rc); |
| kfree(site); |
| } |
| } else { |
| rc = -ENOMEM; |
| } |
| if (rc != 0) { |
| vvp_device_free(env, lud); |
| lud = ERR_PTR(rc); |
| } |
| return lud; |
| } |
| |
| static int vvp_device_init(const struct lu_env *env, struct lu_device *d, |
| const char *name, struct lu_device *next) |
| { |
| struct vvp_device *vdv; |
| int rc; |
| |
| vdv = lu2vvp_dev(d); |
| vdv->vdv_next = lu2cl_dev(next); |
| |
| LASSERT(d->ld_site && next->ld_type); |
| next->ld_site = d->ld_site; |
| rc = next->ld_type->ldt_ops->ldto_device_init(env, next, |
| next->ld_type->ldt_name, |
| NULL); |
| if (rc == 0) { |
| lu_device_get(next); |
| lu_ref_add(&next->ld_reference, "lu-stack", &lu_site_init); |
| } |
| return rc; |
| } |
| |
| static struct lu_device *vvp_device_fini(const struct lu_env *env, |
| struct lu_device *d) |
| { |
| return cl2lu_dev(lu2vvp_dev(d)->vdv_next); |
| } |
| |
| 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 = vvp_device_free, |
| .ldto_device_init = vvp_device_init, |
| .ldto_device_fini = vvp_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 rc; |
| |
| rc = lu_kmem_init(vvp_caches); |
| if (rc != 0) |
| return rc; |
| |
| rc = lu_device_type_init(&vvp_device_type); |
| if (rc != 0) |
| goto out_kmem; |
| |
| return 0; |
| |
| out_kmem: |
| lu_kmem_fini(vvp_caches); |
| |
| return rc; |
| } |
| |
| void vvp_global_fini(void) |
| { |
| lu_device_type_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)) { |
| cl2vvp_dev(cl)->vdv_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) { |
| 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; |
| } |
| |
| /**************************************************************************** |
| * |
| * debugfs/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(struct cfs_hash *hs, struct cfs_hash_bd *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) { |
| struct lu_object *lu_obj; |
| |
| lu_obj = lu_object_locate(id->vpi_obj, dev->ld_type); |
| if (lu_obj) { |
| 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) { |
| struct inode *inode = vvp_object_inode(clob); |
| struct page *vmpage; |
| int nr; |
| |
| nr = find_get_pages_contig(inode->i_mapping, |
| id.vpi_index, 1, &vmpage); |
| if (nr > 0) { |
| id.vpi_index = vmpage->index; |
| /* Cant support over 16T file */ |
| nr = !(vmpage->index > 0xffffffff); |
| put_page(vmpage); |
| } |
| |
| 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 vvp_page *vpg; |
| struct page *vmpage; |
| int has_flags; |
| |
| vpg = cl2vvp_page(cl_page_at(page, &vvp_device_type)); |
| vmpage = vpg->vpg_page; |
| seq_printf(seq, " %5i | %p %p %s %s %s %s | %p "DFID"(%p) %lu %u [", |
| 0 /* gen */, |
| vpg, page, |
| "none", |
| vpg->vpg_write_queued ? "wq" : "- ", |
| vpg->vpg_defer_uptodate ? "du" : "- ", |
| PageWriteback(vmpage) ? "wb" : "-", |
| vmpage, PFID(ll_inode2fid(vmpage->mapping->host)), |
| 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 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) { |
| struct inode *inode = vvp_object_inode(clob); |
| struct cl_page *page = NULL; |
| struct page *vmpage; |
| |
| result = find_get_pages_contig(inode->i_mapping, |
| id.vpi_index, 1, |
| &vmpage); |
| if (result > 0) { |
| lock_page(vmpage); |
| page = cl_vmpage_page(vmpage, clob); |
| unlock_page(vmpage); |
| put_page(vmpage); |
| } |
| |
| seq_printf(f, "%8x@" DFID ": ", id.vpi_index, |
| PFID(lu_object_fid(&clob->co_lu))); |
| if (page) { |
| 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 const 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 seq_file *seq; |
| int rc; |
| |
| rc = seq_open(filp, &vvp_pgcache_ops); |
| if (rc) |
| return rc; |
| |
| seq = filp->private_data; |
| seq->private = inode->i_private; |
| |
| return 0; |
| } |
| |
| const 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, |
| }; |