fs/nfs/dir.c

/* */
This source file includes following definitions.
nfs_dir_read
nfs_readdir
nfs_kfree_cache
nfs_lookup_cache_index
nfs_lookup_cache_lookup
nfs_lookup_cache_add
nfs_lookup_cache_remove
nfs_lookup_cache_refresh
nfs_lookup
nfs_create
nfs_mknod
nfs_mkdir
nfs_rmdir
nfs_unlink
nfs_symlink
nfs_link
nfs_rename
nfs_refresh_inode
   1 /*
   2  *  linux/fs/nfs/dir.c
   3  *
   4  *  Copyright (C) 1992  Rick Sladkey
   5  *
   6  *  nfs directory handling functions
   7  */
   8 
   9 #ifdef MODULE
  10 #include <linux/module.h>
  11 #endif
  12 
  13 #include <linux/sched.h>
  14 #include <linux/errno.h>
  15 #include <linux/stat.h>
  16 #include <linux/nfs_fs.h>
  17 #include <linux/fcntl.h>
  18 #include <linux/string.h>
  19 #include <linux/kernel.h>
  20 #include <linux/malloc.h>
  21 #include <linux/mm.h>
  22 
  23 #include <asm/segment.h>        /* for fs functions */
  24 
  25 static int nfs_dir_read(struct inode *, struct file *filp, char *buf,
  26                         int count);
  27 static int nfs_readdir(struct inode *, struct file *, void *, filldir_t);
  28 static int nfs_lookup(struct inode *dir, const char *name, int len,
  29                       struct inode **result);
  30 static int nfs_create(struct inode *dir, const char *name, int len, int mode,
  31                       struct inode **result);
  32 static int nfs_mkdir(struct inode *dir, const char *name, int len, int mode);
  33 static int nfs_rmdir(struct inode *dir, const char *name, int len);
  34 static int nfs_unlink(struct inode *dir, const char *name, int len);
  35 static int nfs_symlink(struct inode *inode, const char *name, int len,
  36                        const char *symname);
  37 static int nfs_link(struct inode *oldinode, struct inode *dir,
  38                     const char *name, int len);
  39 static int nfs_mknod(struct inode *dir, const char *name, int len, int mode,
  40                      int rdev);
  41 static int nfs_rename(struct inode *old_dir, const char *old_name,
  42                       int old_len, struct inode *new_dir, const char *new_name,
  43                       int new_len);
  44 
  45 static struct file_operations nfs_dir_operations = {
  46         NULL,                   /* lseek - default */
  47         nfs_dir_read,           /* read - bad */
  48         NULL,                   /* write - bad */
  49         nfs_readdir,            /* readdir */
  50         NULL,                   /* select - default */
  51         NULL,                   /* ioctl - default */
  52         NULL,                   /* mmap */
  53         NULL,                   /* no special open code */
  54         NULL,                   /* no special release code */
  55         NULL                    /* fsync */
  56 };
  57 
  58 struct inode_operations nfs_dir_inode_operations = {
  59         &nfs_dir_operations,    /* default directory file-ops */
  60         nfs_create,             /* create */
  61         nfs_lookup,             /* lookup */
  62         nfs_link,               /* link */
  63         nfs_unlink,             /* unlink */
  64         nfs_symlink,            /* symlink */
  65         nfs_mkdir,              /* mkdir */
  66         nfs_rmdir,              /* rmdir */
  67         nfs_mknod,              /* mknod */
  68         nfs_rename,             /* rename */
  69         NULL,                   /* readlink */
  70         NULL,                   /* follow_link */
  71         NULL,                   /* bmap */
  72         NULL,                   /* truncate */
  73         NULL                    /* permission */
  74 };
  75 
  76 static int nfs_dir_read(struct inode *inode, struct file *filp, char *buf,
     /*  */
  77                         int count)
  78 {
  79         return -EISDIR;
  80 }
  81 
  82 static struct nfs_entry *c_entry = NULL;
  83 
  84 /*
  85  * We need to do caching of directory entries to prevent an
  86  * incredible amount of RPC traffic.  Only the most recent open
  87  * directory is cached.  This seems sufficient for most purposes.
  88  * Technically, we ought to flush the cache on close but this is
  89  * not a problem in practice.
  90  */
  91 
  92 static int nfs_readdir(struct inode *inode, struct file *filp,
     /*  */
  93                        void *dirent, filldir_t filldir)
  94 {
  95         static int c_dev = 0;
  96         static int c_ino;
  97         static int c_size;
  98 
  99         int result;
 100         int i, index = 0;
 101         struct nfs_entry *entry;
 102 
 103         if (!inode || !S_ISDIR(inode->i_mode)) {
 104                 printk("nfs_readdir: inode is NULL or not a directory\n");
 105                 return -EBADF;
 106         }
 107 
 108         /* initialize cache memory if it hasn't been used before */
 109 
 110         if (c_entry == NULL) {
 111                 i = sizeof (struct nfs_entry)*NFS_READDIR_CACHE_SIZE;
 112                 c_entry = (struct nfs_entry *) kmalloc(i, GFP_KERNEL);
 113                 if (c_entry == NULL) {
 114                         printk("nfs_readdir: no MEMORY for cache\n");
 115                         return -ENOMEM;
 116                 }
 117                 for (i = 0; i < NFS_READDIR_CACHE_SIZE; i++) {
 118                         c_entry[i].name = (char *) kmalloc(NFS_MAXNAMLEN + 1,
 119                                 GFP_KERNEL);
 120                         if (c_entry[i].name == NULL) {
 121                                 printk("nfs_readdir: no MEMORY for cache\n");
 122                                 while (--i>=0)
 123                                         kfree(c_entry[i].name);
 124                                 kfree(c_entry);
 125                                 c_entry = NULL;
 126                                 return -ENOMEM;
 127                         }
 128                 }
 129         }
 130         entry = NULL;
 131 
 132         /* try to find it in the cache */
 133 
 134         if (inode->i_dev == c_dev && inode->i_ino == c_ino) {
 135                 for (i = 0; i < c_size; i++) {
 136                         if (filp->f_pos == c_entry[i].cookie) {
 137                                 if (i == c_size - 1) {
 138                                         if (c_entry[i].eof)
 139                                                 return 0;
 140                                 }
 141                                 else
 142                                         entry = c_entry + (index = i + 1);
 143                                 break;
 144                         }
 145                 }
 146         }
 147 
 148         /* if we didn't find it in the cache, revert to an nfs call */
 149 
 150         if (!entry) {
 151                 result = nfs_proc_readdir(NFS_SERVER(inode), NFS_FH(inode),
 152                         filp->f_pos, NFS_READDIR_CACHE_SIZE, c_entry);
 153                 if (result < 0) {
 154                         c_dev = 0;
 155                         return result;
 156                 }
 157                 if (result > 0) {
 158                         c_dev = inode->i_dev;
 159                         c_ino = inode->i_ino;
 160                         c_size = result;
 161                         entry = c_entry + (index = 0);
 162                 }
 163         }
 164 
 165         /* if we found it in the cache or from an nfs call, return results */
 166         if (!entry)
 167                 return 0;
 168         while (index < c_size) {
 169                 int nextpos = entry->cookie;
 170                 if (filldir(dirent, entry->name, strlen(entry->name), filp->f_pos, entry->fileid) < 0)
 171                         break;
 172                 filp->f_pos = nextpos;
 173                 /* revalidate the cache if we slept in filldir() */
 174                 if (inode->i_dev != c_dev)
 175                         break;
 176                 if (inode->i_ino != c_ino)
 177                         break;
 178                 if (nextpos != entry->cookie)
 179                         break;
 180                 index++;
 181                 entry++;
 182         }
 183         return 0;
 184 }
 185 
 186 /*
 187  * free cache memory
 188  * called from cleanup_module
 189  */
 190 
 191 void nfs_kfree_cache(void)
     /*  */
 192 {
 193         int i;
 194 
 195         if (c_entry == NULL)
 196                 return;
 197         for (i = 0; i < NFS_READDIR_CACHE_SIZE; i++)
 198                 kfree(c_entry[i].name);
 199         kfree(c_entry);
 200         c_entry = NULL;
 201 }
 202  
 203 
 204 /*
 205  * Lookup caching is a big win for performance but this is just
 206  * a trial to see how well it works on a small scale.
 207  * For example, bash does a lookup on ".." 13 times for each path
 208  * element when running pwd.  Yes, hard to believe but true.
 209  * Try pwd in a filesystem mounted with noac.
 210  *
 211  * It trades a little cpu time and memory for a lot of network bandwidth.
 212  * Since the cache is not hashed yet, it is a good idea not to make it too
 213  * large because every lookup looks through the entire cache even
 214  * though most of them will fail.
 215  */
 216 
 217 static struct nfs_lookup_cache_entry {
 218         int dev;
 219         int inode;
 220         char filename[NFS_MAXNAMLEN + 1];
 221         struct nfs_fh fhandle;
 222         struct nfs_fattr fattr;
 223         int expiration_date;
 224 } nfs_lookup_cache[NFS_LOOKUP_CACHE_SIZE];
 225 
 226 static struct nfs_lookup_cache_entry *nfs_lookup_cache_index(struct inode *dir,
     /*  */
 227                                                              const char *filename)
 228 {
 229         struct nfs_lookup_cache_entry *entry;
 230         int i;
 231 
 232         for (i = 0; i < NFS_LOOKUP_CACHE_SIZE; i++) {
 233                 entry = nfs_lookup_cache + i;
 234                 if (entry->dev == dir->i_dev && entry->inode == dir->i_ino
 235                     && !strncmp(filename, entry->filename, NFS_MAXNAMLEN))
 236                         return entry;
 237         }
 238         return NULL;
 239 }
 240 
 241 static int nfs_lookup_cache_lookup(struct inode *dir, const char *filename,
     /*  */
 242                                    struct nfs_fh *fhandle,
 243                                    struct nfs_fattr *fattr)
 244 {
 245         static int nfs_lookup_cache_in_use = 0;
 246 
 247         struct nfs_lookup_cache_entry *entry;
 248 
 249         if (!nfs_lookup_cache_in_use) {
 250                 memset(nfs_lookup_cache, 0, sizeof(nfs_lookup_cache));
 251                 nfs_lookup_cache_in_use = 1;
 252         }
 253         if ((entry = nfs_lookup_cache_index(dir, filename))) {
 254                 if (jiffies > entry->expiration_date) {
 255                         entry->dev = 0;
 256                         return 0;
 257                 }
 258                 *fhandle = entry->fhandle;
 259                 *fattr = entry->fattr;
 260                 return 1;
 261         }
 262         return 0;
 263 }
 264 
 265 static void nfs_lookup_cache_add(struct inode *dir, const char *filename,
     /*  */
 266                                  struct nfs_fh *fhandle,
 267                                  struct nfs_fattr *fattr)
 268 {
 269         static int nfs_lookup_cache_pos = 0;
 270         struct nfs_lookup_cache_entry *entry;
 271 
 272         /* compensate for bug in SGI NFS server */
 273         if (fattr->size == -1 || fattr->uid == -1 || fattr->gid == -1
 274             || fattr->atime.seconds == -1 || fattr->mtime.seconds == -1)
 275                 return;
 276         if (!(entry = nfs_lookup_cache_index(dir, filename))) {
 277                 entry = nfs_lookup_cache + nfs_lookup_cache_pos++;
 278                 if (nfs_lookup_cache_pos == NFS_LOOKUP_CACHE_SIZE)
 279                         nfs_lookup_cache_pos = 0;
 280         }
 281         entry->dev = dir->i_dev;
 282         entry->inode = dir->i_ino;
 283         strcpy(entry->filename, filename);
 284         entry->fhandle = *fhandle;
 285         entry->fattr = *fattr;
 286         entry->expiration_date = jiffies + (S_ISDIR(fattr->mode)
 287                 ? NFS_SERVER(dir)->acdirmin : NFS_SERVER(dir)->acregmin);
 288 }
 289 
 290 static void nfs_lookup_cache_remove(struct inode *dir, struct inode *inode,
     /*  */
 291                                     const char *filename)
 292 {
 293         struct nfs_lookup_cache_entry *entry;
 294         int dev;
 295         int fileid;
 296         int i;
 297 
 298         if (inode) {
 299                 dev = inode->i_dev;
 300                 fileid = inode->i_ino;
 301         }
 302         else if ((entry = nfs_lookup_cache_index(dir, filename))) {
 303                 dev = entry->dev;
 304                 fileid = entry->fattr.fileid;
 305         }
 306         else
 307                 return;
 308         for (i = 0; i < NFS_LOOKUP_CACHE_SIZE; i++) {
 309                 entry = nfs_lookup_cache + i;
 310                 if (entry->dev == dev && entry->fattr.fileid == fileid)
 311                         entry->dev = 0;
 312         }
 313 }
 314 
 315 static void nfs_lookup_cache_refresh(struct inode *file,
     /*  */
 316                                      struct nfs_fattr *fattr)
 317 {
 318         struct nfs_lookup_cache_entry *entry;
 319         int dev = file->i_dev;
 320         int fileid = file->i_ino;
 321         int i;
 322 
 323         for (i = 0; i < NFS_LOOKUP_CACHE_SIZE; i++) {
 324                 entry = nfs_lookup_cache + i;
 325                 if (entry->dev == dev && entry->fattr.fileid == fileid)
 326                         entry->fattr = *fattr;
 327         }
 328 }
 329 
 330 static int nfs_lookup(struct inode *dir, const char *__name, int len,
     /*  */
 331                       struct inode **result)
 332 {
 333         struct nfs_fh fhandle;
 334         struct nfs_fattr fattr;
 335         char name[len > NFS_MAXNAMLEN? 1 : len+1];
 336         int error;
 337 
 338         *result = NULL;
 339         if (!dir || !S_ISDIR(dir->i_mode)) {
 340                 printk("nfs_lookup: inode is NULL or not a directory\n");
 341                 iput(dir);
 342                 return -ENOENT;
 343         }
 344         if (len > NFS_MAXNAMLEN) {
 345                 iput(dir);
 346                 return -ENAMETOOLONG;
 347         }
 348         memcpy(name,__name,len);
 349         name[len] = '\0';
 350         if (len == 1 && name[0] == '.') { /* cheat for "." */
 351                 *result = dir;
 352                 return 0;
 353         }
 354         if ((NFS_SERVER(dir)->flags & NFS_MOUNT_NOAC)
 355             || !nfs_lookup_cache_lookup(dir, name, &fhandle, &fattr)) {
 356                 if ((error = nfs_proc_lookup(NFS_SERVER(dir), NFS_FH(dir),
 357                     name, &fhandle, &fattr))) {
 358                         iput(dir);
 359                         return error;
 360                 }
 361                 nfs_lookup_cache_add(dir, name, &fhandle, &fattr);
 362         }
 363         if (!(*result = nfs_fhget(dir->i_sb, &fhandle, &fattr))) {
 364                 iput(dir);
 365                 return -EACCES;
 366         }
 367         iput(dir);
 368         return 0;
 369 }
 370 
 371 static int nfs_create(struct inode *dir, const char *name, int len, int mode,
     /*  */
 372                       struct inode **result)
 373 {
 374         struct nfs_sattr sattr;
 375         struct nfs_fattr fattr;
 376         struct nfs_fh fhandle;
 377         int error;
 378 
 379         *result = NULL;
 380         if (!dir || !S_ISDIR(dir->i_mode)) {
 381                 printk("nfs_create: inode is NULL or not a directory\n");
 382                 iput(dir);
 383                 return -ENOENT;
 384         }
 385         if (len > NFS_MAXNAMLEN) {
 386                 iput(dir);
 387                 return -ENAMETOOLONG;
 388         }
 389         sattr.mode = mode;
 390         sattr.uid = sattr.gid = sattr.size = (unsigned) -1;
 391         sattr.atime.seconds = sattr.mtime.seconds = (unsigned) -1;
 392         if ((error = nfs_proc_create(NFS_SERVER(dir), NFS_FH(dir),
 393                 name, &sattr, &fhandle, &fattr))) {
 394                 iput(dir);
 395                 return error;
 396         }
 397         if (!(*result = nfs_fhget(dir->i_sb, &fhandle, &fattr))) {
 398                 iput(dir);
 399                 return -EACCES;
 400         }
 401         nfs_lookup_cache_add(dir, name, &fhandle, &fattr);
 402         iput(dir);
 403         return 0;
 404 }
 405 
 406 static int nfs_mknod(struct inode *dir, const char *name, int len,
     /*  */
 407                      int mode, int rdev)
 408 {
 409         struct nfs_sattr sattr;
 410         struct nfs_fattr fattr;
 411         struct nfs_fh fhandle;
 412         int error;
 413 
 414         if (!dir || !S_ISDIR(dir->i_mode)) {
 415                 printk("nfs_mknod: inode is NULL or not a directory\n");
 416                 iput(dir);
 417                 return -ENOENT;
 418         }
 419         if (len > NFS_MAXNAMLEN) {
 420                 iput(dir);
 421                 return -ENAMETOOLONG;
 422         }
 423         sattr.mode = mode;
 424         sattr.uid = sattr.gid = (unsigned) -1;
 425         if (S_ISCHR(mode) || S_ISBLK(mode))
 426                 sattr.size = rdev; /* get out your barf bag */
 427         else
 428                 sattr.size = (unsigned) -1;
 429         sattr.atime.seconds = sattr.mtime.seconds = (unsigned) -1;
 430         error = nfs_proc_create(NFS_SERVER(dir), NFS_FH(dir),
 431                 name, &sattr, &fhandle, &fattr);
 432         if (!error)
 433                 nfs_lookup_cache_add(dir, name, &fhandle, &fattr);
 434         iput(dir);
 435         return error;
 436 }
 437 
 438 static int nfs_mkdir(struct inode *dir, const char *name, int len, int mode)
     /*  */
 439 {
 440         struct nfs_sattr sattr;
 441         struct nfs_fattr fattr;
 442         struct nfs_fh fhandle;
 443         int error;
 444 
 445         if (!dir || !S_ISDIR(dir->i_mode)) {
 446                 printk("nfs_mkdir: inode is NULL or not a directory\n");
 447                 iput(dir);
 448                 return -ENOENT;
 449         }
 450         if (len > NFS_MAXNAMLEN) {
 451                 iput(dir);
 452                 return -ENAMETOOLONG;
 453         }
 454         sattr.mode = mode;
 455         sattr.uid = sattr.gid = sattr.size = (unsigned) -1;
 456         sattr.atime.seconds = sattr.mtime.seconds = (unsigned) -1;
 457         error = nfs_proc_mkdir(NFS_SERVER(dir), NFS_FH(dir),
 458                 name, &sattr, &fhandle, &fattr);
 459         if (!error)
 460                 nfs_lookup_cache_add(dir, name, &fhandle, &fattr);
 461         iput(dir);
 462         return error;
 463 }
 464 
 465 static int nfs_rmdir(struct inode *dir, const char *name, int len)
     /*  */
 466 {
 467         int error;
 468 
 469         if (!dir || !S_ISDIR(dir->i_mode)) {
 470                 printk("nfs_rmdir: inode is NULL or not a directory\n");
 471                 iput(dir);
 472                 return -ENOENT;
 473         }
 474         if (len > NFS_MAXNAMLEN) {
 475                 iput(dir);
 476                 return -ENAMETOOLONG;
 477         }
 478         error = nfs_proc_rmdir(NFS_SERVER(dir), NFS_FH(dir), name);
 479         if (!error)
 480                 nfs_lookup_cache_remove(dir, NULL, name);
 481         iput(dir);
 482         return error;
 483 }
 484 
 485 static int nfs_unlink(struct inode *dir, const char *name, int len)
     /*  */
 486 {
 487         int error;
 488 
 489         if (!dir || !S_ISDIR(dir->i_mode)) {
 490                 printk("nfs_unlink: inode is NULL or not a directory\n");
 491                 iput(dir);
 492                 return -ENOENT;
 493         }
 494         if (len > NFS_MAXNAMLEN) {
 495                 iput(dir);
 496                 return -ENAMETOOLONG;
 497         }
 498         error = nfs_proc_remove(NFS_SERVER(dir), NFS_FH(dir), name);
 499         if (!error)
 500                 nfs_lookup_cache_remove(dir, NULL, name);
 501         iput(dir);
 502         return error;
 503 }
 504 
 505 static int nfs_symlink(struct inode *dir, const char *name, int len,
     /*  */
 506                        const char *symname)
 507 {
 508         struct nfs_sattr sattr;
 509         int error;
 510 
 511         if (!dir || !S_ISDIR(dir->i_mode)) {
 512                 printk("nfs_symlink: inode is NULL or not a directory\n");
 513                 iput(dir);
 514                 return -ENOENT;
 515         }
 516         if (len > NFS_MAXNAMLEN) {
 517                 iput(dir);
 518                 return -ENAMETOOLONG;
 519         }
 520         if (strlen(symname) > NFS_MAXPATHLEN) {
 521                 iput(dir);
 522                 return -ENAMETOOLONG;
 523         }
 524         sattr.mode = S_IFLNK | S_IRWXUGO; /* SunOS 4.1.2 crashes without this! */
 525         sattr.uid = sattr.gid = sattr.size = (unsigned) -1;
 526         sattr.atime.seconds = sattr.mtime.seconds = (unsigned) -1;
 527         error = nfs_proc_symlink(NFS_SERVER(dir), NFS_FH(dir),
 528                 name, symname, &sattr);
 529         iput(dir);
 530         return error;
 531 }
 532 
 533 static int nfs_link(struct inode *oldinode, struct inode *dir,
     /*  */
 534                     const char *name, int len)
 535 {
 536         int error;
 537 
 538         if (!oldinode) {
 539                 printk("nfs_link: old inode is NULL\n");
 540                 iput(oldinode);
 541                 iput(dir);
 542                 return -ENOENT;
 543         }
 544         if (!dir || !S_ISDIR(dir->i_mode)) {
 545                 printk("nfs_link: dir is NULL or not a directory\n");
 546                 iput(oldinode);
 547                 iput(dir);
 548                 return -ENOENT;
 549         }
 550         if (len > NFS_MAXNAMLEN) {
 551                 iput(oldinode);
 552                 iput(dir);
 553                 return -ENAMETOOLONG;
 554         }
 555         error = nfs_proc_link(NFS_SERVER(oldinode), NFS_FH(oldinode),
 556                 NFS_FH(dir), name);
 557         if (!error)
 558                 nfs_lookup_cache_remove(dir, oldinode, NULL);
 559         iput(oldinode);
 560         iput(dir);
 561         return error;
 562 }
 563 
 564 static int nfs_rename(struct inode *old_dir, const char *old_name, int old_len,
     /*  */
 565                       struct inode *new_dir, const char *new_name, int new_len)
 566 {
 567         int error;
 568 
 569         if (!old_dir || !S_ISDIR(old_dir->i_mode)) {
 570                 printk("nfs_rename: old inode is NULL or not a directory\n");
 571                 iput(old_dir);
 572                 iput(new_dir);
 573                 return -ENOENT;
 574         }
 575         if (!new_dir || !S_ISDIR(new_dir->i_mode)) {
 576                 printk("nfs_rename: new inode is NULL or not a directory\n");
 577                 iput(old_dir);
 578                 iput(new_dir);
 579                 return -ENOENT;
 580         }
 581         if (old_len > NFS_MAXNAMLEN || new_len > NFS_MAXNAMLEN) {
 582                 iput(old_dir);
 583                 iput(new_dir);
 584                 return -ENAMETOOLONG;
 585         }
 586         error = nfs_proc_rename(NFS_SERVER(old_dir),
 587                 NFS_FH(old_dir), old_name,
 588                 NFS_FH(new_dir), new_name);
 589         if (!error) {
 590                 nfs_lookup_cache_remove(old_dir, NULL, old_name);
 591                 nfs_lookup_cache_remove(new_dir, NULL, new_name);
 592         }
 593         iput(old_dir);
 594         iput(new_dir);
 595         return error;
 596 }
 597 
 598 /*
 599  * Many nfs protocol calls return the new file attributes after
 600  * an operation.  Here we update the inode to reflect the state
 601  * of the server's inode.
 602  */
 603 
 604 void nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
     /*  */
 605 {
 606         int was_empty;
 607 
 608         if (!inode || !fattr) {
 609                 printk("nfs_refresh_inode: inode or fattr is NULL\n");
 610                 return;
 611         }
 612         if (inode->i_ino != fattr->fileid) {
 613                 printk("nfs_refresh_inode: inode number mismatch\n");
 614                 return;
 615         }
 616         was_empty = inode->i_mode == 0;
 617         inode->i_mode = fattr->mode;
 618         inode->i_nlink = fattr->nlink;
 619         inode->i_uid = fattr->uid;
 620         inode->i_gid = fattr->gid;
 621         inode->i_size = fattr->size;
 622         inode->i_blksize = fattr->blocksize;
 623         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 624                 inode->i_rdev = fattr->rdev;
 625         else
 626                 inode->i_rdev = 0;
 627         inode->i_blocks = fattr->blocks;
 628         inode->i_atime = fattr->atime.seconds;
 629         inode->i_mtime = fattr->mtime.seconds;
 630         inode->i_ctime = fattr->ctime.seconds;
 631         if (was_empty) {
 632                 if (S_ISREG(inode->i_mode))
 633                         inode->i_op = &nfs_file_inode_operations;
 634                 else if (S_ISDIR(inode->i_mode))
 635                         inode->i_op = &nfs_dir_inode_operations;
 636                 else if (S_ISLNK(inode->i_mode))
 637                         inode->i_op = &nfs_symlink_inode_operations;
 638                 else if (S_ISCHR(inode->i_mode))
 639                         inode->i_op = &chrdev_inode_operations;
 640                 else if (S_ISBLK(inode->i_mode))
 641                         inode->i_op = &blkdev_inode_operations;
 642                 else if (S_ISFIFO(inode->i_mode))
 643                         init_fifo(inode);
 644                 else
 645                         inode->i_op = NULL;
 646         }
 647         nfs_lookup_cache_refresh(inode, fattr);
 648 }
 649
/* */
root/fs/nfs/dir.c

DEFINITIONS
