lustre/smfs/cache.c

   1 /*
   2  *  snapfs/cache.c
   3  */
   4
   5 #define DEBUG_SUBSYSTEM S_SM
   6
   7 #include <linux/kmod.h>
   8 #include <linux/init.h>
   9 #include <linux/fs.h>
  10 #include <linux/slab.h>
  11 #include <linux/string.h>
  12 #include <portals/list.h>
  13 #include "smfs_internal.h"
  14 struct sm_ops smfs_operations;
  15
  16 extern struct inode_operations smfs_file_iops;
  17 extern struct file_operations  smfs_file_fops;
  18 extern struct inode_operations smfs_sym_iops;
  19 extern struct file_operations smfs_sym_fops;
  20 extern struct super_operations smfs_super_ops;
  21
  22 inline struct super_operations *cache_sops(struct sm_ops *smfs_ops)
  23 {
  24         return &smfs_ops->sm_sb_ops;
  25 }
  26
  27 inline struct inode_operations *cache_diops(struct sm_ops *smfs_ops)
  28 {
  29         return &smfs_ops->sm_dir_iops;
  30 }
  31
  32 inline struct inode_operations *cache_fiops(struct sm_ops *smfs_ops)
  33 {
  34         return &smfs_ops->sm_file_iops;
  35 }
  36
  37 inline struct inode_operations *cache_siops(struct sm_ops *smfs_ops)
  38 {
  39         return &smfs_ops->sm_sym_iops;
  40 }
  41
  42 inline struct file_operations *cache_dfops(struct sm_ops *smfs_ops)
  43 {
  44         return &smfs_ops->sm_dir_fops;
  45 }
  46
  47 inline struct file_operations *cache_ffops(struct sm_ops *smfs_ops)
  48 {
  49         return &smfs_ops->sm_file_fops;
  50 }
  51
  52 inline struct file_operations *cache_sfops(struct sm_ops *smfs_ops)
  53 {
  54         return &smfs_ops->sm_sym_fops;
  55 }
  56
  57 inline struct dentry_operations *cache_dops(struct sm_ops *smfs_ops)
  58 {
  59         return &smfs_ops->sm_dentry_ops;
  60 }
  61
  62 void init_smfs_cache()
  63 {
  64         memset(&smfs_operations, 0, sizeof(struct sm_ops));
  65 }
  66 void cleanup_smfs_cache()
  67 {
  68         return;
  69 }
  70
  71 static void setup_iops(struct inode *cache_inode,
  72                        struct inode_operations *iops,
  73                        struct inode_operations *cache_iops)
  74 {
  75
  76         if (cache_inode->i_op && cache_iops && iops) {
  77                 if (cache_inode->i_op->create)
  78                         iops->create = cache_iops->create;
  79                 if (cache_inode->i_op->create_it)
  80                         iops->create_it = cache_iops->create_it;
  81                 if (cache_inode->i_op->lookup)
  82                         iops->lookup = cache_iops->lookup;
  83                 if (cache_inode->i_op->lookup_raw)
  84                         iops->lookup_raw = cache_iops->lookup_raw;
  85                 if (cache_inode->i_op->lookup_it)
  86                         iops->lookup_it = cache_iops->lookup_it;
  87                 if (cache_inode->i_op->link)
  88                         iops->link = cache_iops->link;
  89                 if (cache_inode->i_op->link_raw)
  90                         iops->link_raw = cache_iops->link_raw;
  91                 if (cache_inode->i_op->unlink)
  92                         iops->unlink = cache_iops->unlink;
  93                 if (cache_inode->i_op->unlink_raw)
  94                         iops->unlink_raw = cache_iops->unlink_raw;
  95                 if (cache_inode->i_op->symlink)
  96                         iops->symlink = cache_iops->symlink;
  97                 if (cache_inode->i_op->symlink_raw)
  98                         iops->symlink_raw = cache_iops->symlink_raw;
  99                 if (cache_inode->i_op->mkdir)
 100                         iops->mkdir = cache_iops->mkdir;
 101                 if (cache_inode->i_op->mkdir_raw)
 102                         iops->mkdir_raw = cache_iops->mkdir_raw;
 103                 if (cache_inode->i_op->rmdir)
 104                         iops->rmdir = cache_iops->rmdir;
 105                 if (cache_inode->i_op->rmdir_raw)
 106                         iops->rmdir_raw = cache_iops->rmdir_raw;
 107                 if (cache_inode->i_op->mknod)
 108                         iops->mknod = cache_iops->mknod;
 109                 if (cache_inode->i_op->mknod_raw)
 110                         iops->mknod_raw = cache_iops->mknod_raw;
 111                 if (cache_inode->i_op->rename)
 112                         iops->rename = cache_iops->rename;
 113                 if (cache_inode->i_op->rename_raw)
 114                         iops->rename_raw = cache_iops->rename_raw;
 115                 if (cache_inode->i_op->readlink)
 116                         iops->readlink = cache_iops->readlink;
 117                 if (cache_inode->i_op->follow_link)
 118                         iops->follow_link = cache_iops->follow_link;
 119                 if (cache_inode->i_op->truncate)
 120                         iops->truncate = cache_iops->truncate;
 121                 if (cache_inode->i_op->permission)
 122                         iops->permission = cache_iops->permission;
 123                 if (cache_inode->i_op->revalidate)
 124                         iops->revalidate = cache_iops->revalidate;
 125                 if (cache_inode->i_op->revalidate_it)
 126                         iops->revalidate_it = cache_iops->revalidate_it;
 127                 if (cache_inode->i_op->setattr)
 128                         iops->setattr = cache_iops->setattr;
 129                 if (cache_inode->i_op->setattr_raw)
 130                         iops->setattr_raw = cache_iops->setattr_raw;
 131                 if (cache_inode->i_op->getattr)
 132                         iops->getattr = cache_iops->getattr;
 133                 if (cache_inode->i_op->setxattr)
 134                         iops->setxattr = cache_iops->setxattr;
 135                 if (cache_inode->i_op->getxattr)
 136                         iops->getxattr = cache_iops->getxattr;
 137                 if (cache_inode->i_op->listxattr)
 138                         iops->listxattr = cache_iops->listxattr;
 139                 if (cache_inode->i_op->removexattr)
 140                         iops->removexattr = cache_iops->removexattr;
 141         }
 142 }
 143 static void setup_fops(struct inode *cache_inode,
 144                        struct file_operations *fops,
 145                        struct file_operations *cache_fops)
 146 {
 147         if (cache_inode->i_fop && cache_fops && fops) {
 148                 if (cache_inode->i_fop->llseek)
 149                         fops->llseek = cache_fops->llseek;
 150                 if (cache_inode->i_fop->read)
 151                         fops->read = cache_fops->read;
 152                 if (cache_inode->i_fop->write)
 153                         fops->write = cache_fops->write;
 154                 if (cache_inode->i_fop->readdir)
 155                         fops->readdir = cache_fops->readdir;
 156                 if (cache_inode->i_fop->poll)
 157                         fops->poll = cache_fops->poll;
 158                 if (cache_inode->i_fop->ioctl)
 159                         fops->ioctl = cache_fops->ioctl;
 160                 if (cache_inode->i_fop->mmap)
 161                         fops->mmap = cache_fops->mmap;
 162                 if (cache_inode->i_fop->open)
 163                         fops->open = cache_fops->open;
 164                 if (cache_inode->i_fop->flush)
 165                         fops->flush = cache_fops->flush;
 166                 if (cache_inode->i_fop->release)
 167                         fops->release = cache_fops->release;
 168                 if (cache_inode->i_fop->fsync)
 169                         fops->fsync = cache_fops->fsync;
 170                 if (cache_inode->i_fop->fasync)
 171                         fops->fasync = cache_fops->fasync;
 172                 if (cache_inode->i_fop->lock)
 173                         fops->lock = cache_fops->lock;
 174                 if (cache_inode->i_fop->readv)
 175                         fops->readv = cache_fops->readv;
 176                 if (cache_inode->i_fop->writev)
 177                         fops->writev = cache_fops->writev;
 178                 if (cache_inode->i_fop->sendpage)
 179                         fops->sendpage = cache_fops->sendpage;
 180                 if (cache_inode->i_fop->get_unmapped_area)
 181                         fops->get_unmapped_area = cache_fops->get_unmapped_area;
 182         }
 183 }
 184 static void setup_sm_file_ops(struct inode *cache_inode,
 185                               struct inode *inode,
 186                               struct inode_operations *cache_iops,
 187                               struct file_operations *cache_fops)
 188 {
 189         struct smfs_super_info *smb;
 190         struct inode_operations *iops;
 191         struct file_operations *fops;
 192
 193         smb = S2SMI(inode->i_sb);
 194
 195         if (smb->ops_check & FILE_OPS_CHECK)
 196                 return;
 197         smb->ops_check |= FILE_OPS_CHECK;
 198
 199         iops = cache_fiops(&smfs_operations);
 200         fops = cache_ffops(&smfs_operations);
 201
 202         memset(iops , 0 , sizeof (struct inode_operations));
 203         memset(fops , 0 , sizeof (struct file_operations));
 204
 205         setup_iops(cache_inode, iops, cache_iops);
 206         setup_fops(cache_inode, fops, cache_fops);
 207
 208         return;
 209 }
 210
 211 static void setup_sm_dir_ops(struct inode *cache_inode,
 212                              struct  inode *inode,
 213                              struct inode_operations *cache_dir_iops,
 214                              struct file_operations *cache_dir_fops)
 215 {
 216         struct smfs_super_info *smb;
 217         struct inode_operations *iops;
 218         struct file_operations *fops;
 219
 220         smb = S2SMI(inode->i_sb);
 221
 222         if (smb->ops_check & DIR_OPS_CHECK)
 223                 return;
 224         smb->ops_check |= DIR_OPS_CHECK;
 225
 226         iops = cache_diops(&smfs_operations);
 227         fops = cache_dfops(&smfs_operations);
 228
 229         memset(iops, 0, sizeof (struct inode_operations));
 230         memset(fops, 0, sizeof (struct file_operations));
 231
 232         setup_iops(cache_inode, iops, cache_dir_iops);
 233         setup_fops(cache_inode, fops, cache_dir_fops);
 234
 235         return;
 236 }
 237
 238 static void setup_sm_symlink_ops(struct inode *cache_inode,
 239                                  struct  inode *inode,
 240                                  struct inode_operations *cache_sym_iops,
 241                                  struct file_operations *cache_sym_fops)
 242 {
 243         struct smfs_super_info *smb;
 244         struct inode_operations *iops;
 245         struct file_operations *fops;
 246
 247         smb = S2SMI(inode->i_sb);
 248
 249         if (smb->ops_check & SYMLINK_OPS_CHECK)
 250                 return;
 251         smb->ops_check |= SYMLINK_OPS_CHECK;
 252
 253         iops = cache_siops(&smfs_operations);
 254         fops = cache_sfops(&smfs_operations);
 255
 256         memset(iops , 0 , sizeof (struct inode_operations));
 257         memset(fops , 0 , sizeof (struct file_operations));
 258
 259         setup_iops(cache_inode, iops, cache_sym_iops);
 260         setup_fops(cache_inode, fops, cache_sym_fops);
 261
 262         return;
 263 }
 264
 265 static void setup_sm_sb_ops(struct super_block *cache_sb,
 266                             struct super_block *sb,
 267                             struct super_operations *smfs_sops)
 268 {
 269         struct smfs_super_info *smb;
 270         struct super_operations *sops;
 271
 272         ENTRY;
 273
 274         smb = S2SMI(sb);
 275
 276         if (smb->ops_check & SB_OPS_CHECK)
 277                 return;
 278         smb->ops_check |= SB_OPS_CHECK;
 279         sops = cache_sops(&smfs_operations);
 280         memset(sops, 0, sizeof (struct super_operations));
 281
 282         if (cache_sb->s_op) {
 283                 if (cache_sb->s_op->read_inode)
 284                         sops->read_inode = smfs_sops->read_inode;
 285                 if (cache_sb->s_op->read_inode2)
 286                         sops->read_inode2 = smfs_sops->read_inode2;
 287                 if (cache_sb->s_op->dirty_inode)
 288                         sops->dirty_inode = smfs_sops->dirty_inode;
 289                 if (cache_sb->s_op->write_inode)
 290                         sops->write_inode = smfs_sops->write_inode;
 291                 if (cache_sb->s_op->put_inode)
 292                         sops->put_inode = smfs_sops->put_inode;
 293                 if (cache_sb->s_op->delete_inode)
 294                         sops->delete_inode = smfs_sops->delete_inode;
 295                 if (cache_sb->s_op->put_super)
 296                         sops->put_super = smfs_sops->put_super;
 297                 if (cache_sb->s_op->write_super)
 298                         sops->write_super = smfs_sops->write_super;
 299                 if (cache_sb->s_op->write_super_lockfs)
 300                         sops->write_super_lockfs = smfs_sops->write_super_lockfs;
 301                 if (cache_sb->s_op->unlockfs)
 302                         sops->unlockfs = smfs_sops->unlockfs;
 303                 if (cache_sb->s_op->statfs)
 304                         sops->statfs = smfs_sops->statfs;
 305                 if (cache_sb->s_op->remount_fs)
 306                         sops->remount_fs = smfs_sops->remount_fs;
 307                 if (cache_sb->s_op->umount_begin)
 308                         sops->umount_begin = smfs_sops->umount_begin;
 309                 if (cache_sb->s_op->fh_to_dentry)
 310                         sops->fh_to_dentry = smfs_sops->fh_to_dentry;
 311                 if (cache_sb->s_op->dentry_to_fh)
 312                         sops->dentry_to_fh = smfs_sops->dentry_to_fh;
 313                 if (cache_sb->s_op->show_options)
 314                         sops->show_options = smfs_sops->show_options;
 315                 /*FIXME we need this method to clear the cache inode */
 316                 sops->clear_inode = smfs_sops->clear_inode;
 317         }
 318
 319         return;
 320 }
 321 void sm_set_inode_ops(struct inode *cache_inode, struct inode *inode)
 322 {
 323         /* XXX now set the correct snap_{file,dir,sym}_iops */
 324         if (S_ISDIR(inode->i_mode)) {
 325                 setup_sm_dir_ops(cache_inode, inode,
 326                                  &smfs_dir_iops,
 327                                  &smfs_dir_fops);
 328                 inode->i_op = cache_diops(&smfs_operations);
 329                 inode->i_fop = cache_dfops(&smfs_operations);
 330         } else if (S_ISREG(inode->i_mode)) {
 331                 setup_sm_file_ops(cache_inode, inode,
 332                                   &smfs_file_iops,
 333                                   &smfs_file_fops);
 334                 CDEBUG(D_INODE, "inode %lu, i_op at %p\n",
 335                        inode->i_ino, inode->i_op);
 336                 inode->i_fop = cache_ffops(&smfs_operations);
 337                 inode->i_op = cache_fiops(&smfs_operations);
 338
 339         } else if (S_ISLNK(inode->i_mode)) {
 340                 setup_sm_symlink_ops(cache_inode, inode,
 341                                      &smfs_sym_iops,
 342                                      &smfs_sym_fops);
 343                 inode->i_op = cache_siops(&smfs_operations);
 344                 inode->i_fop = cache_sfops(&smfs_operations);
 345                 CDEBUG(D_INODE, "inode %lu, i_op at %p\n",
 346                        inode->i_ino, inode->i_op);
 347         }
 348 }
 349 void sm_set_sb_ops (struct super_block *cache_sb,
 350                       struct super_block *sb)
 351 {
 352         struct smfs_super_info *smb;
 353
 354         smb = S2SMI(sb);
 355
 356         setup_sm_sb_ops(cache_sb, sb, &smfs_super_ops);
 357
 358         sb->s_op = cache_sops(&smfs_operations);
 359         return;
 360 }
 361