lustre/smfs/cache.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  lustre/smfs/cache.c
   5  *  Lustre filesystem abstraction routines
   6  *
   7  *  Copyright (C) 2004 Cluster File Systems, Inc.
   8  *
   9  *   This file is part of Lustre, http://www.lustre.org.
  10  *
  11  *   Lustre is free software; you can redistribute it and/or
  12  *   modify it under the terms of version 2 of the GNU General Public
  13  *   License as published by the Free Software Foundation.
  14  *
  15  *   Lustre is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with Lustre; if not, write to the Free Software
  22  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24 #define DEBUG_SUBSYSTEM S_SM
  25
  26 #include <linux/kmod.h>
  27 #include <linux/init.h>
  28 #include <linux/fs.h>
  29 #include <linux/slab.h>
  30 #include <linux/string.h>
  31 #include <linux/lustre_idl.h>
  32 #include <libcfs/list.h>
  33 #include <linux/obd_class.h>
  34 #include <linux/obd_support.h>
  35 #include <linux/lustre_lib.h>
  36 #include <linux/lustre_fsfilt.h>
  37 #include <linux/lustre_smfs.h>
  38
  39 #include "smfs_internal.h"
  40 int smfs_init_sm_ops(struct smfs_super_info *smb)
  41 {
  42         struct sm_operations    *sm_ops;   /*cache ops for set cache inode ops*/
  43
  44         OBD_ALLOC(sm_ops, sizeof(struct sm_operations));
  45         if (!sm_ops)
  46                 RETURN(-ENOMEM);
  47
  48         smb->sm_ops = sm_ops;
  49         RETURN(0);
  50 }
  51
  52 void smfs_cleanup_sm_ops(struct smfs_super_info *smb)
  53 {
  54         if (smb->sm_ops)
  55                 OBD_FREE(smb->sm_ops, sizeof(struct sm_operations));
  56 }
  57
  58 static void setup_iops(struct inode *cache_inode,
  59                        struct inode_operations *iops,
  60                        struct inode_operations *cache_iops)
  61 {
  62
  63         if (cache_inode->i_op && cache_iops && iops) {
  64                 if (cache_inode->i_op->create)
  65                         iops->create = cache_iops->create;
  66                 if (cache_inode->i_op->lookup)
  67                         iops->lookup = cache_iops->lookup;
  68                 if (cache_inode->i_op->link)
  69                         iops->link = cache_iops->link;
  70                 if (cache_inode->i_op->unlink)
  71                         iops->unlink = cache_iops->unlink;
  72                 if (cache_inode->i_op->symlink)
  73                         iops->symlink = cache_iops->symlink;
  74                 if (cache_inode->i_op->mkdir)
  75                         iops->mkdir = cache_iops->mkdir;
  76                 if (cache_inode->i_op->rmdir)
  77                         iops->rmdir = cache_iops->rmdir;
  78                 if (cache_inode->i_op->mknod)
  79                         iops->mknod = cache_iops->mknod;
  80                 if (cache_inode->i_op->rename)
  81                         iops->rename = cache_iops->rename;
  82                 if (cache_inode->i_op->readlink)
  83                         iops->readlink = cache_iops->readlink;
  84                 if (cache_inode->i_op->follow_link)
  85                         iops->follow_link = cache_iops->follow_link;
  86                 if (cache_inode->i_op->truncate)
  87                         iops->truncate = cache_iops->truncate;
  88                 if (cache_inode->i_op->permission)
  89                         iops->permission = cache_iops->permission;
  90 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  91                 if (cache_inode->i_op->revalidate)
  92                         iops->revalidate = cache_iops->revalidate;
  93 #endif
  94                 if (cache_inode->i_op->setattr)
  95                         iops->setattr = cache_iops->setattr;
  96                 if (cache_inode->i_op->getattr)
  97                         iops->getattr = cache_iops->getattr;
  98                 if (cache_inode->i_op->setxattr)
  99                         iops->setxattr = cache_iops->setxattr;
 100                 if (cache_inode->i_op->getxattr)
 101                         iops->getxattr = cache_iops->getxattr;
 102                 if (cache_inode->i_op->listxattr)
 103                         iops->listxattr = cache_iops->listxattr;
 104                 if (cache_inode->i_op->removexattr)
 105                         iops->removexattr = cache_iops->removexattr;
 106 #if HAVE_LOOKUP_RAW
 107                 if (cache_inode->i_op->lookup_raw)
 108                         iops->lookup_raw = cache_iops->lookup_raw;
 109 #endif
 110         }
 111 }
 112
 113 static void setup_fops(struct inode *cache_inode,
 114                        struct file_operations *fops,
 115                        struct file_operations *cache_fops)
 116 {
 117         if (cache_inode->i_fop && cache_fops && fops) {
 118                 if (cache_inode->i_fop->llseek)
 119                         fops->llseek = cache_fops->llseek;
 120                 if (cache_inode->i_fop->read)
 121                         fops->read = cache_fops->read;
 122                 if (cache_inode->i_fop->write)
 123                         fops->write = cache_fops->write;
 124                 if (cache_inode->i_fop->readdir)
 125                         fops->readdir = cache_fops->readdir;
 126                 if (cache_inode->i_fop->poll)
 127                         fops->poll = cache_fops->poll;
 128                 if (cache_inode->i_fop->ioctl)
 129                         fops->ioctl = cache_fops->ioctl;
 130                 if (cache_inode->i_fop->mmap)
 131                         fops->mmap = cache_fops->mmap;
 132                 if (cache_inode->i_fop->flush)
 133                         fops->flush = cache_fops->flush;
 134                 if (cache_inode->i_fop->fsync)
 135                         fops->fsync = cache_fops->fsync;
 136                 if (cache_inode->i_fop->fasync)
 137                         fops->fasync = cache_fops->fasync;
 138                 if (cache_inode->i_fop->lock)
 139                         fops->lock = cache_fops->lock;
 140                 if (cache_inode->i_fop->readv)
 141                         fops->readv = cache_fops->readv;
 142                 if (cache_inode->i_fop->writev)
 143                         fops->writev = cache_fops->writev;
 144                 if (cache_inode->i_fop->sendpage)
 145                         fops->sendpage = cache_fops->sendpage;
 146                 if (cache_inode->i_fop->get_unmapped_area)
 147                         fops->get_unmapped_area = cache_fops->get_unmapped_area;
 148
 149                 /* for dir file we also need replace the open and release method,
 150                  * because we need initialize the cache file structs. */
 151                 fops->open = cache_fops->open;
 152                 fops->release = cache_fops->release;
 153         }
 154 }
 155
 156 static void setup_sm_file_ops(struct inode *cache_inode, struct inode *inode,
 157                               struct inode_operations *cache_iops,
 158                               struct file_operations *cache_fops)
 159 {
 160         struct smfs_super_info *smb;
 161         struct inode_operations *iops;
 162         struct file_operations *fops;
 163
 164         smb = S2SMI(inode->i_sb);
 165
 166         if (smb->smsi_ops_check & FILE_OPS_CHECK)
 167                 return;
 168
 169         iops = cache_fiops(smb);
 170         fops = cache_ffops(smb);
 171
 172         setup_iops(cache_inode, iops, cache_iops);
 173         setup_fops(cache_inode, fops, cache_fops);
 174
 175         lock_kernel();
 176         smb->smsi_ops_check |= FILE_OPS_CHECK;
 177         unlock_kernel();
 178 }
 179
 180 static void setup_sm_dir_ops(struct inode *cache_inode, struct inode *inode,
 181                              struct inode_operations *cache_dir_iops,
 182                              struct file_operations *cache_dir_fops)
 183 {
 184         struct smfs_super_info *smb;
 185         struct inode_operations *iops;
 186         struct file_operations *fops;
 187
 188         smb = S2SMI(inode->i_sb);
 189
 190         if (smb->smsi_ops_check & DIR_OPS_CHECK)
 191                 return;
 192
 193         iops = cache_diops(smb);
 194         fops = cache_dfops(smb);
 195
 196         setup_iops(cache_inode, iops, cache_dir_iops);
 197         setup_fops(cache_inode, fops, cache_dir_fops);
 198
 199         lock_kernel();
 200         smb->smsi_ops_check |= DIR_OPS_CHECK;
 201         unlock_kernel();
 202 }
 203
 204 static void setup_sm_symlink_ops(struct inode *cache_inode, struct inode *inode,
 205                                  struct inode_operations *cache_sym_iops,
 206                                  struct file_operations *cache_sym_fops)
 207 {
 208         struct smfs_super_info *smb;
 209         struct inode_operations *iops;
 210         struct file_operations *fops;
 211
 212         smb = S2SMI(inode->i_sb);
 213
 214         if (smb->smsi_ops_check & SYMLINK_OPS_CHECK)
 215                 return;
 216
 217         iops = cache_siops(smb);
 218         fops = cache_sfops(smb);
 219
 220         setup_iops(cache_inode, iops, cache_sym_iops);
 221         setup_fops(cache_inode, fops, cache_sym_fops);
 222
 223         lock_kernel();
 224         smb->smsi_ops_check |= SYMLINK_OPS_CHECK;
 225         unlock_kernel();
 226 }
 227
 228
 229 void sm_set_inode_ops(struct inode *cache_inode, struct inode *inode)
 230 {
 231         struct smfs_super_info *smb = S2SMI(inode->i_sb);
 232
 233         /* XXX now set the correct sm_{file,dir,sym}_iops */
 234         if (S_ISDIR(inode->i_mode)) {
 235                 setup_sm_dir_ops(cache_inode, inode,
 236                                  &smfs_dir_iops,
 237                                  &smfs_dir_fops);
 238                 inode->i_op = cache_diops(smb);
 239                 inode->i_fop = cache_dfops(smb);
 240         } else if (S_ISREG(inode->i_mode)) {
 241                 setup_sm_file_ops(cache_inode, inode,
 242                                   &smfs_file_iops,
 243                                   &smfs_file_fops);
 244                 CDEBUG(D_INODE, "inode %lu, i_op at %p\n",
 245                        inode->i_ino, inode->i_op);
 246                 inode->i_fop = cache_ffops(smb);
 247                 inode->i_op = cache_fiops(smb);
 248
 249         } else if (S_ISLNK(inode->i_mode)) {
 250                 setup_sm_symlink_ops(cache_inode, inode,
 251                                      &smfs_sym_iops,
 252                                      &smfs_sym_fops);
 253                 inode->i_op = cache_siops(smb);
 254                 inode->i_fop = cache_sfops(smb);
 255                 CDEBUG(D_INODE, "inode %lu, i_op at %p\n",
 256                        inode->i_ino, inode->i_op);
 257         }
 258 }
 259
 260
 261 void sm_set_sb_ops(struct super_block *cache_sb, struct super_block *sb)
 262 {
 263         struct smfs_super_info *smb = S2SMI(sb);
 264         struct super_operations *sops = &smb->sm_ops->sm_sb_ops;
 265         struct super_operations *smfs_sops = &smfs_super_ops;
 266         ENTRY;
 267
 268         if (smb->smsi_ops_check & SB_OPS_CHECK)
 269                 return;
 270
 271         //set up only operations exist in backfs
 272         memset(sops, 0, sizeof (struct super_operations));
 273         if (cache_sb->s_op) {
 274                 if (cache_sb->s_op->dirty_inode)
 275                         sops->dirty_inode = smfs_sops->dirty_inode;
 276                 if (cache_sb->s_op->write_inode)
 277                         sops->write_inode = smfs_sops->write_inode;
 278                 if (cache_sb->s_op->put_super)
 279                         sops->put_super = smfs_sops->put_super;
 280                 if (cache_sb->s_op->write_super)
 281                         sops->write_super = smfs_sops->write_super;
 282                 if (cache_sb->s_op->write_super_lockfs)
 283                         sops->write_super_lockfs = smfs_sops->write_super_lockfs;
 284                 if (cache_sb->s_op->unlockfs)
 285                         sops->unlockfs = smfs_sops->unlockfs;
 286                 if (cache_sb->s_op->statfs)
 287                         sops->statfs = smfs_sops->statfs;
 288                 if (cache_sb->s_op->remount_fs)
 289                         sops->remount_fs = smfs_sops->remount_fs;
 290                 //if (cache_sb->s_op->umount_begin)
 291                 //      sops->umount_begin = smfs_sops->umount_begin;
 292
 293 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 294                 if (cache_sb->s_op->fh_to_dentry)
 295                         sops->fh_to_dentry = smfs_sops->fh_to_dentry;
 296                 if (cache_sb->s_op->dentry_to_fh)
 297                         sops->dentry_to_fh = smfs_sops->dentry_to_fh;
 298                 if (cache_sb->s_op->show_options)
 299                         sops->show_options = smfs_sops->show_options;
 300
 301                 sops->read_inode2 = smfs_sops->read_inode2;
 302 #endif
 303                 /* these ops are needed always */
 304                 sops->clear_inode = smfs_sops->clear_inode;
 305                 sops->delete_inode = smfs_sops->delete_inode;
 306
 307         }
 308
 309         lock_kernel();
 310         smb->smsi_ops_check |= SB_OPS_CHECK;
 311         unlock_kernel();
 312         sb->s_op = sops;
 313         return;
 314 }
 315
 316