drivers/staging/lustre/lustre/llite/vvp_object.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * cl_object implementation for VVP layer.
  33  *
  34  *   Author: Nikita Danilov <nikita.danilov@sun.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LLITE
  38
  39 #include "../../include/linux/libcfs/libcfs.h"
  40
  41 #include "../include/obd.h"
  42 #include "../include/lustre_lite.h"
  43
  44 #include "llite_internal.h"
  45 #include "vvp_internal.h"
  46
  47 /*****************************************************************************
  48  *
  49  * Object operations.
  50  *
  51  */
  52
  53 int vvp_object_invariant(const struct cl_object *obj)
  54 {
  55         struct inode *inode  = vvp_object_inode(obj);
  56         struct ll_inode_info *lli = ll_i2info(inode);
  57
  58         return (S_ISREG(inode->i_mode) || inode->i_mode == 0) &&
  59                 lli->lli_clob == obj;
  60 }
  61
  62 static int vvp_object_print(const struct lu_env *env, void *cookie,
  63                             lu_printer_t p, const struct lu_object *o)
  64 {
  65         struct vvp_object    *obj   = lu2vvp(o);
  66         struct inode     *inode = obj->vob_inode;
  67         struct ll_inode_info *lli;
  68
  69         (*p)(env, cookie, "(%s %d %d) inode: %p ",
  70              list_empty(&obj->vob_pending_list) ? "-" : "+",
  71              obj->vob_transient_pages, atomic_read(&obj->vob_mmap_cnt),
  72              inode);
  73         if (inode) {
  74                 lli = ll_i2info(inode);
  75                 (*p)(env, cookie, "%lu/%u %o %u %d %p "DFID,
  76                      inode->i_ino, inode->i_generation, inode->i_mode,
  77                      inode->i_nlink, atomic_read(&inode->i_count),
  78                      lli->lli_clob, PFID(&lli->lli_fid));
  79         }
  80         return 0;
  81 }
  82
  83 static int vvp_attr_get(const struct lu_env *env, struct cl_object *obj,
  84                         struct cl_attr *attr)
  85 {
  86         struct inode *inode = vvp_object_inode(obj);
  87
  88         /*
  89          * lov overwrites most of these fields in
  90          * lov_attr_get()->...lov_merge_lvb_kms(), except when inode
  91          * attributes are newer.
  92          */
  93
  94         attr->cat_size = i_size_read(inode);
  95         attr->cat_mtime = inode->i_mtime.tv_sec;
  96         attr->cat_atime = inode->i_atime.tv_sec;
  97         attr->cat_ctime = inode->i_ctime.tv_sec;
  98         attr->cat_blocks = inode->i_blocks;
  99         attr->cat_uid = from_kuid(&init_user_ns, inode->i_uid);
 100         attr->cat_gid = from_kgid(&init_user_ns, inode->i_gid);
 101         /* KMS is not known by this layer */
 102         return 0; /* layers below have to fill in the rest */
 103 }
 104
 105 static int vvp_attr_set(const struct lu_env *env, struct cl_object *obj,
 106                         const struct cl_attr *attr, unsigned valid)
 107 {
 108         struct inode *inode = vvp_object_inode(obj);
 109
 110         if (valid & CAT_UID)
 111                 inode->i_uid = make_kuid(&init_user_ns, attr->cat_uid);
 112         if (valid & CAT_GID)
 113                 inode->i_gid = make_kgid(&init_user_ns, attr->cat_gid);
 114         if (valid & CAT_ATIME)
 115                 inode->i_atime.tv_sec = attr->cat_atime;
 116         if (valid & CAT_MTIME)
 117                 inode->i_mtime.tv_sec = attr->cat_mtime;
 118         if (valid & CAT_CTIME)
 119                 inode->i_ctime.tv_sec = attr->cat_ctime;
 120         if (0 && valid & CAT_SIZE)
 121                 i_size_write(inode, attr->cat_size);
 122         /* not currently necessary */
 123         if (0 && valid & (CAT_UID | CAT_GID | CAT_SIZE))
 124                 mark_inode_dirty(inode);
 125         return 0;
 126 }
 127
 128 static int vvp_conf_set(const struct lu_env *env, struct cl_object *obj,
 129                         const struct cl_object_conf *conf)
 130 {
 131         struct ll_inode_info *lli = ll_i2info(conf->coc_inode);
 132
 133         if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
 134                 CDEBUG(D_VFSTRACE, DFID ": losing layout lock\n",
 135                        PFID(&lli->lli_fid));
 136
 137                 ll_layout_version_set(lli, LL_LAYOUT_GEN_NONE);
 138
 139                 /* Clean up page mmap for this inode.
 140                  * The reason for us to do this is that if the page has
 141                  * already been installed into memory space, the process
 142                  * can access it without interacting with lustre, so this
 143                  * page may be stale due to layout change, and the process
 144                  * will never be notified.
 145                  * This operation is expensive but mmap processes have to pay
 146                  * a price themselves.
 147                  */
 148                 unmap_mapping_range(conf->coc_inode->i_mapping,
 149                                     0, OBD_OBJECT_EOF, 0);
 150
 151                 return 0;
 152         }
 153
 154         if (conf->coc_opc != OBJECT_CONF_SET)
 155                 return 0;
 156
 157         if (conf->u.coc_md && conf->u.coc_md->lsm) {
 158                 CDEBUG(D_VFSTRACE, DFID ": layout version change: %u -> %u\n",
 159                        PFID(&lli->lli_fid), lli->lli_layout_gen,
 160                        conf->u.coc_md->lsm->lsm_layout_gen);
 161
 162                 lli->lli_has_smd = lsm_has_objects(conf->u.coc_md->lsm);
 163                 ll_layout_version_set(lli, conf->u.coc_md->lsm->lsm_layout_gen);
 164         } else {
 165                 CDEBUG(D_VFSTRACE, DFID ": layout nuked: %u.\n",
 166                        PFID(&lli->lli_fid), lli->lli_layout_gen);
 167
 168                 lli->lli_has_smd = false;
 169                 ll_layout_version_set(lli, LL_LAYOUT_GEN_EMPTY);
 170         }
 171         return 0;
 172 }
 173
 174 static int vvp_prune(const struct lu_env *env, struct cl_object *obj)
 175 {
 176         struct inode *inode = vvp_object_inode(obj);
 177         int rc;
 178
 179         rc = cl_sync_file_range(inode, 0, OBD_OBJECT_EOF, CL_FSYNC_LOCAL, 1);
 180         if (rc < 0) {
 181                 CDEBUG(D_VFSTRACE, DFID ": writeback failed: %d\n",
 182                        PFID(lu_object_fid(&obj->co_lu)), rc);
 183                 return rc;
 184         }
 185
 186         truncate_inode_pages(inode->i_mapping, 0);
 187         return 0;
 188 }
 189
 190 static int vvp_object_glimpse(const struct lu_env *env,
 191                               const struct cl_object *obj, struct ost_lvb *lvb)
 192 {
 193         struct inode *inode = vvp_object_inode(obj);
 194
 195         lvb->lvb_mtime = LTIME_S(inode->i_mtime);
 196         lvb->lvb_atime = LTIME_S(inode->i_atime);
 197         lvb->lvb_ctime = LTIME_S(inode->i_ctime);
 198         /*
 199          * LU-417: Add dirty pages block count lest i_blocks reports 0, some
 200          * "cp" or "tar" on remote node may think it's a completely sparse file
 201          * and skip it.
 202          */
 203         if (lvb->lvb_size > 0 && lvb->lvb_blocks == 0)
 204                 lvb->lvb_blocks = dirty_cnt(inode);
 205         return 0;
 206 }
 207
 208 static const struct cl_object_operations vvp_ops = {
 209         .coo_page_init = vvp_page_init,
 210         .coo_lock_init = vvp_lock_init,
 211         .coo_io_init   = vvp_io_init,
 212         .coo_attr_get  = vvp_attr_get,
 213         .coo_attr_set  = vvp_attr_set,
 214         .coo_conf_set  = vvp_conf_set,
 215         .coo_prune     = vvp_prune,
 216         .coo_glimpse   = vvp_object_glimpse
 217 };
 218
 219 static int vvp_object_init0(const struct lu_env *env,
 220                             struct vvp_object *vob,
 221                             const struct cl_object_conf *conf)
 222 {
 223         vob->vob_inode = conf->coc_inode;
 224         vob->vob_transient_pages = 0;
 225         cl_object_page_init(&vob->vob_cl, sizeof(struct vvp_page));
 226         return 0;
 227 }
 228
 229 static int vvp_object_init(const struct lu_env *env, struct lu_object *obj,
 230                            const struct lu_object_conf *conf)
 231 {
 232         struct vvp_device *dev = lu2vvp_dev(obj->lo_dev);
 233         struct vvp_object *vob = lu2vvp(obj);
 234         struct lu_object  *below;
 235         struct lu_device  *under;
 236         int result;
 237
 238         under = &dev->vdv_next->cd_lu_dev;
 239         below = under->ld_ops->ldo_object_alloc(env, obj->lo_header, under);
 240         if (below) {
 241                 const struct cl_object_conf *cconf;
 242
 243                 cconf = lu2cl_conf(conf);
 244                 INIT_LIST_HEAD(&vob->vob_pending_list);
 245                 lu_object_add(obj, below);
 246                 result = vvp_object_init0(env, vob, cconf);
 247         } else {
 248                 result = -ENOMEM;
 249         }
 250
 251         return result;
 252 }
 253
 254 static void vvp_object_free(const struct lu_env *env, struct lu_object *obj)
 255 {
 256         struct vvp_object *vob = lu2vvp(obj);
 257
 258         lu_object_fini(obj);
 259         lu_object_header_fini(obj->lo_header);
 260         kmem_cache_free(vvp_object_kmem, vob);
 261 }
 262
 263 static const struct lu_object_operations vvp_lu_obj_ops = {
 264         .loo_object_init        = vvp_object_init,
 265         .loo_object_free        = vvp_object_free,
 266         .loo_object_print       = vvp_object_print,
 267 };
 268
 269 struct vvp_object *cl_inode2vvp(struct inode *inode)
 270 {
 271         struct ll_inode_info *lli = ll_i2info(inode);
 272         struct cl_object     *obj = lli->lli_clob;
 273         struct lu_object     *lu;
 274
 275         lu = lu_object_locate(obj->co_lu.lo_header, &vvp_device_type);
 276         LASSERT(lu);
 277         return lu2vvp(lu);
 278 }
 279
 280 struct lu_object *vvp_object_alloc(const struct lu_env *env,
 281                                    const struct lu_object_header *unused,
 282                                    struct lu_device *dev)
 283 {
 284         struct vvp_object *vob;
 285         struct lu_object  *obj;
 286
 287         vob = kmem_cache_zalloc(vvp_object_kmem, GFP_NOFS);
 288         if (vob) {
 289                 struct cl_object_header *hdr;
 290
 291                 obj = &vob->vob_cl.co_lu;
 292                 hdr = &vob->vob_header;
 293                 cl_object_header_init(hdr);
 294                 hdr->coh_page_bufsize = cfs_size_round(sizeof(struct cl_page));
 295
 296                 lu_object_init(obj, &hdr->coh_lu, dev);
 297                 lu_object_add_top(&hdr->coh_lu, obj);
 298
 299                 vob->vob_cl.co_ops = &vvp_ops;
 300                 obj->lo_ops = &vvp_lu_obj_ops;
 301         } else {
 302                 obj = NULL;
 303         }
 304         return obj;
 305 }