fs/9p/vfs_inode_dotl.c

   1 /*
   2  *  linux/fs/9p/vfs_inode_dotl.c
   3  *
   4  * This file contains vfs inode ops for the 9P2000.L protocol.
   5  *
   6  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   7  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2
  11  *  as published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to:
  20  *  Free Software Foundation
  21  *  51 Franklin Street, Fifth Floor
  22  *  Boston, MA  02111-1301  USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/errno.h>
  28 #include <linux/fs.h>
  29 #include <linux/file.h>
  30 #include <linux/pagemap.h>
  31 #include <linux/stat.h>
  32 #include <linux/string.h>
  33 #include <linux/inet.h>
  34 #include <linux/namei.h>
  35 #include <linux/idr.h>
  36 #include <linux/sched.h>
  37 #include <linux/slab.h>
  38 #include <linux/xattr.h>
  39 #include <linux/posix_acl.h>
  40 #include <net/9p/9p.h>
  41 #include <net/9p/client.h>
  42
  43 #include "v9fs.h"
  44 #include "v9fs_vfs.h"
  45 #include "fid.h"
  46 #include "cache.h"
  47 #include "xattr.h"
  48 #include "acl.h"
  49
  50 static int
  51 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
  52                     dev_t rdev);
  53
  54 /**
  55  * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
  56  * new file system object. This checks the S_ISGID to determine the owning
  57  * group of the new file system object.
  58  */
  59
  60 static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
  61 {
  62         BUG_ON(dir_inode == NULL);
  63
  64         if (dir_inode->i_mode & S_ISGID) {
  65                 /* set_gid bit is set.*/
  66                 return dir_inode->i_gid;
  67         }
  68         return current_fsgid();
  69 }
  70
  71 /**
  72  * v9fs_dentry_from_dir_inode - helper function to get the dentry from
  73  * dir inode.
  74  *
  75  */
  76
  77 static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
  78 {
  79         struct dentry *dentry;
  80
  81         spin_lock(&inode->i_lock);
  82         /* Directory should have only one entry. */
  83         BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
  84         dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
  85         spin_unlock(&inode->i_lock);
  86         return dentry;
  87 }
  88
  89 struct inode *
  90 v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
  91         struct super_block *sb)
  92 {
  93         struct inode *ret = NULL;
  94         int err;
  95         struct p9_stat_dotl *st;
  96
  97         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
  98         if (IS_ERR(st))
  99                 return ERR_CAST(st);
 100
 101         ret = v9fs_get_inode(sb, st->st_mode);
 102         if (IS_ERR(ret)) {
 103                 err = PTR_ERR(ret);
 104                 goto error;
 105         }
 106
 107         v9fs_stat2inode_dotl(st, ret);
 108         ret->i_ino = v9fs_qid2ino(&st->qid);
 109 #ifdef CONFIG_9P_FSCACHE
 110         v9fs_vcookie_set_qid(ret, &st->qid);
 111         v9fs_cache_inode_get_cookie(ret);
 112 #endif
 113         err = v9fs_get_acl(ret, fid);
 114         if (err) {
 115                 iput(ret);
 116                 goto error;
 117         }
 118         kfree(st);
 119         return ret;
 120 error:
 121         kfree(st);
 122         return ERR_PTR(err);
 123 }
 124
 125 /**
 126  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 127  * @dir: directory inode that is being created
 128  * @dentry:  dentry that is being deleted
 129  * @mode: create permissions
 130  * @nd: path information
 131  *
 132  */
 133
 134 static int
 135 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
 136                 struct nameidata *nd)
 137 {
 138         int err = 0;
 139         char *name = NULL;
 140         gid_t gid;
 141         int flags;
 142         mode_t mode;
 143         struct v9fs_session_info *v9ses;
 144         struct p9_fid *fid = NULL;
 145         struct p9_fid *dfid, *ofid;
 146         struct file *filp;
 147         struct p9_qid qid;
 148         struct inode *inode;
 149         struct posix_acl *pacl = NULL, *dacl = NULL;
 150
 151         v9ses = v9fs_inode2v9ses(dir);
 152         if (nd && nd->flags & LOOKUP_OPEN)
 153                 flags = nd->intent.open.flags - 1;
 154         else {
 155                 /*
 156                  * create call without LOOKUP_OPEN is due
 157                  * to mknod of regular files. So use mknod
 158                  * operation.
 159                  */
 160                 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 161         }
 162
 163         name = (char *) dentry->d_name.name;
 164         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
 165                         "mode:0x%x\n", name, flags, omode);
 166
 167         dfid = v9fs_fid_lookup(dentry->d_parent);
 168         if (IS_ERR(dfid)) {
 169                 err = PTR_ERR(dfid);
 170                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 171                 return err;
 172         }
 173
 174         /* clone a fid to use for creation */
 175         ofid = p9_client_walk(dfid, 0, NULL, 1);
 176         if (IS_ERR(ofid)) {
 177                 err = PTR_ERR(ofid);
 178                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 179                 return err;
 180         }
 181
 182         gid = v9fs_get_fsgid_for_create(dir);
 183
 184         mode = omode;
 185         /* Update mode based on ACL value */
 186         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 187         if (err) {
 188                 P9_DPRINTK(P9_DEBUG_VFS,
 189                            "Failed to get acl values in creat %d\n", err);
 190                 goto error;
 191         }
 192         err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
 193         if (err < 0) {
 194                 P9_DPRINTK(P9_DEBUG_VFS,
 195                                 "p9_client_open_dotl failed in creat %d\n",
 196                                 err);
 197                 goto error;
 198         }
 199
 200         /* instantiate inode and assign the unopened fid to the dentry */
 201         fid = p9_client_walk(dfid, 1, &name, 1);
 202         if (IS_ERR(fid)) {
 203                 err = PTR_ERR(fid);
 204                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 205                 fid = NULL;
 206                 goto error;
 207         }
 208         inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 209         if (IS_ERR(inode)) {
 210                 err = PTR_ERR(inode);
 211                 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 212                 goto error;
 213         }
 214         d_instantiate(dentry, inode);
 215         err = v9fs_fid_add(dentry, fid);
 216         if (err < 0)
 217                 goto error;
 218
 219         /* Now set the ACL based on the default value */
 220         v9fs_set_create_acl(dentry, dacl, pacl);
 221
 222         /* Since we are opening a file, assign the open fid to the file */
 223         filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
 224         if (IS_ERR(filp)) {
 225                 p9_client_clunk(ofid);
 226                 return PTR_ERR(filp);
 227         }
 228         filp->private_data = ofid;
 229         return 0;
 230
 231 error:
 232         if (ofid)
 233                 p9_client_clunk(ofid);
 234         if (fid)
 235                 p9_client_clunk(fid);
 236         return err;
 237 }
 238
 239 /**
 240  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 241  * @dir:  inode that is being unlinked
 242  * @dentry: dentry that is being unlinked
 243  * @mode: mode for new directory
 244  *
 245  */
 246
 247 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 248                                struct dentry *dentry, int omode)
 249 {
 250         int err;
 251         struct v9fs_session_info *v9ses;
 252         struct p9_fid *fid = NULL, *dfid = NULL;
 253         gid_t gid;
 254         char *name;
 255         mode_t mode;
 256         struct inode *inode;
 257         struct p9_qid qid;
 258         struct dentry *dir_dentry;
 259         struct posix_acl *dacl = NULL, *pacl = NULL;
 260
 261         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 262         err = 0;
 263         v9ses = v9fs_inode2v9ses(dir);
 264
 265         omode |= S_IFDIR;
 266         if (dir->i_mode & S_ISGID)
 267                 omode |= S_ISGID;
 268
 269         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 270         dfid = v9fs_fid_lookup(dir_dentry);
 271         if (IS_ERR(dfid)) {
 272                 err = PTR_ERR(dfid);
 273                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 274                 dfid = NULL;
 275                 goto error;
 276         }
 277
 278         gid = v9fs_get_fsgid_for_create(dir);
 279         mode = omode;
 280         /* Update mode based on ACL value */
 281         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 282         if (err) {
 283                 P9_DPRINTK(P9_DEBUG_VFS,
 284                            "Failed to get acl values in mkdir %d\n", err);
 285                 goto error;
 286         }
 287         name = (char *) dentry->d_name.name;
 288         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 289         if (err < 0)
 290                 goto error;
 291
 292         /* instantiate inode and assign the unopened fid to the dentry */
 293         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 294                 fid = p9_client_walk(dfid, 1, &name, 1);
 295                 if (IS_ERR(fid)) {
 296                         err = PTR_ERR(fid);
 297                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 298                                 err);
 299                         fid = NULL;
 300                         goto error;
 301                 }
 302
 303                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 304                 if (IS_ERR(inode)) {
 305                         err = PTR_ERR(inode);
 306                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 307                                 err);
 308                         goto error;
 309                 }
 310                 d_instantiate(dentry, inode);
 311                 err = v9fs_fid_add(dentry, fid);
 312                 if (err < 0)
 313                         goto error;
 314                 fid = NULL;
 315         } else {
 316                 /*
 317                  * Not in cached mode. No need to populate
 318                  * inode with stat. We need to get an inode
 319                  * so that we can set the acl with dentry
 320                  */
 321                 inode = v9fs_get_inode(dir->i_sb, mode);
 322                 if (IS_ERR(inode)) {
 323                         err = PTR_ERR(inode);
 324                         goto error;
 325                 }
 326                 d_instantiate(dentry, inode);
 327         }
 328         /* Now set the ACL based on the default value */
 329         v9fs_set_create_acl(dentry, dacl, pacl);
 330
 331 error:
 332         if (fid)
 333                 p9_client_clunk(fid);
 334         return err;
 335 }
 336
 337 static int
 338 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 339                  struct kstat *stat)
 340 {
 341         int err;
 342         struct v9fs_session_info *v9ses;
 343         struct p9_fid *fid;
 344         struct p9_stat_dotl *st;
 345
 346         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 347         err = -EPERM;
 348         v9ses = v9fs_inode2v9ses(dentry->d_inode);
 349         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
 350                 return simple_getattr(mnt, dentry, stat);
 351
 352         fid = v9fs_fid_lookup(dentry);
 353         if (IS_ERR(fid))
 354                 return PTR_ERR(fid);
 355
 356         /* Ask for all the fields in stat structure. Server will return
 357          * whatever it supports
 358          */
 359
 360         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 361         if (IS_ERR(st))
 362                 return PTR_ERR(st);
 363
 364         v9fs_stat2inode_dotl(st, dentry->d_inode);
 365         generic_fillattr(dentry->d_inode, stat);
 366         /* Change block size to what the server returned */
 367         stat->blksize = st->st_blksize;
 368
 369         kfree(st);
 370         return 0;
 371 }
 372
 373 /**
 374  * v9fs_vfs_setattr_dotl - set file metadata
 375  * @dentry: file whose metadata to set
 376  * @iattr: metadata assignment structure
 377  *
 378  */
 379
 380 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 381 {
 382         int retval;
 383         struct v9fs_session_info *v9ses;
 384         struct p9_fid *fid;
 385         struct p9_iattr_dotl p9attr;
 386
 387         P9_DPRINTK(P9_DEBUG_VFS, "\n");
 388
 389         retval = inode_change_ok(dentry->d_inode, iattr);
 390         if (retval)
 391                 return retval;
 392
 393         p9attr.valid = iattr->ia_valid;
 394         p9attr.mode = iattr->ia_mode;
 395         p9attr.uid = iattr->ia_uid;
 396         p9attr.gid = iattr->ia_gid;
 397         p9attr.size = iattr->ia_size;
 398         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 399         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 400         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 401         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 402
 403         retval = -EPERM;
 404         v9ses = v9fs_inode2v9ses(dentry->d_inode);
 405         fid = v9fs_fid_lookup(dentry);
 406         if (IS_ERR(fid))
 407                 return PTR_ERR(fid);
 408
 409         retval = p9_client_setattr(fid, &p9attr);
 410         if (retval < 0)
 411                 return retval;
 412
 413         if ((iattr->ia_valid & ATTR_SIZE) &&
 414             iattr->ia_size != i_size_read(dentry->d_inode)) {
 415                 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
 416                 if (retval)
 417                         return retval;
 418         }
 419
 420         setattr_copy(dentry->d_inode, iattr);
 421         mark_inode_dirty(dentry->d_inode);
 422         if (iattr->ia_valid & ATTR_MODE) {
 423                 /* We also want to update ACL when we update mode bits */
 424                 retval = v9fs_acl_chmod(dentry);
 425                 if (retval < 0)
 426                         return retval;
 427         }
 428         return 0;
 429 }
 430
 431 /**
 432  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 433  * @stat: stat structure
 434  * @inode: inode to populate
 435  * @sb: superblock of filesystem
 436  *
 437  */
 438
 439 void
 440 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 441 {
 442
 443         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 444                 inode->i_atime.tv_sec = stat->st_atime_sec;
 445                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 446                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 447                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 448                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 449                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 450                 inode->i_uid = stat->st_uid;
 451                 inode->i_gid = stat->st_gid;
 452                 inode->i_nlink = stat->st_nlink;
 453                 inode->i_mode = stat->st_mode;
 454                 inode->i_rdev = new_decode_dev(stat->st_rdev);
 455
 456                 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
 457                         init_special_inode(inode, inode->i_mode, inode->i_rdev);
 458
 459                 i_size_write(inode, stat->st_size);
 460                 inode->i_blocks = stat->st_blocks;
 461         } else {
 462                 if (stat->st_result_mask & P9_STATS_ATIME) {
 463                         inode->i_atime.tv_sec = stat->st_atime_sec;
 464                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 465                 }
 466                 if (stat->st_result_mask & P9_STATS_MTIME) {
 467                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 468                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 469                 }
 470                 if (stat->st_result_mask & P9_STATS_CTIME) {
 471                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 472                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 473                 }
 474                 if (stat->st_result_mask & P9_STATS_UID)
 475                         inode->i_uid = stat->st_uid;
 476                 if (stat->st_result_mask & P9_STATS_GID)
 477                         inode->i_gid = stat->st_gid;
 478                 if (stat->st_result_mask & P9_STATS_NLINK)
 479                         inode->i_nlink = stat->st_nlink;
 480                 if (stat->st_result_mask & P9_STATS_MODE) {
 481                         inode->i_mode = stat->st_mode;
 482                         if ((S_ISBLK(inode->i_mode)) ||
 483                                                 (S_ISCHR(inode->i_mode)))
 484                                 init_special_inode(inode, inode->i_mode,
 485                                                                 inode->i_rdev);
 486                 }
 487                 if (stat->st_result_mask & P9_STATS_RDEV)
 488                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 489                 if (stat->st_result_mask & P9_STATS_SIZE)
 490                         i_size_write(inode, stat->st_size);
 491                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 492                         inode->i_blocks = stat->st_blocks;
 493         }
 494         if (stat->st_result_mask & P9_STATS_GEN)
 495                         inode->i_generation = stat->st_gen;
 496
 497         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 498          * because the inode structure does not have fields for them.
 499          */
 500 }
 501
 502 static int
 503 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 504                 const char *symname)
 505 {
 506         struct v9fs_session_info *v9ses;
 507         struct p9_fid *dfid;
 508         struct p9_fid *fid = NULL;
 509         struct inode *inode;
 510         struct p9_qid qid;
 511         char *name;
 512         int err;
 513         gid_t gid;
 514
 515         name = (char *) dentry->d_name.name;
 516         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
 517                         dir->i_ino, name, symname);
 518         v9ses = v9fs_inode2v9ses(dir);
 519
 520         dfid = v9fs_fid_lookup(dentry->d_parent);
 521         if (IS_ERR(dfid)) {
 522                 err = PTR_ERR(dfid);
 523                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 524                 return err;
 525         }
 526
 527         gid = v9fs_get_fsgid_for_create(dir);
 528
 529         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 530         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 531
 532         if (err < 0) {
 533                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 534                 goto error;
 535         }
 536
 537         if (v9ses->cache) {
 538                 /* Now walk from the parent so we can get an unopened fid. */
 539                 fid = p9_client_walk(dfid, 1, &name, 1);
 540                 if (IS_ERR(fid)) {
 541                         err = PTR_ERR(fid);
 542                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 543                                         err);
 544                         fid = NULL;
 545                         goto error;
 546                 }
 547
 548                 /* instantiate inode and assign the unopened fid to dentry */
 549                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 550                 if (IS_ERR(inode)) {
 551                         err = PTR_ERR(inode);
 552                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 553                                         err);
 554                         goto error;
 555                 }
 556                 d_instantiate(dentry, inode);
 557                 err = v9fs_fid_add(dentry, fid);
 558                 if (err < 0)
 559                         goto error;
 560                 fid = NULL;
 561         } else {
 562                 /* Not in cached mode. No need to populate inode with stat */
 563                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
 564                 if (IS_ERR(inode)) {
 565                         err = PTR_ERR(inode);
 566                         goto error;
 567                 }
 568                 d_instantiate(dentry, inode);
 569         }
 570
 571 error:
 572         if (fid)
 573                 p9_client_clunk(fid);
 574
 575         return err;
 576 }
 577
 578 /**
 579  * v9fs_vfs_link_dotl - create a hardlink for dotl
 580  * @old_dentry: dentry for file to link to
 581  * @dir: inode destination for new link
 582  * @dentry: dentry for link
 583  *
 584  */
 585
 586 static int
 587 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 588                 struct dentry *dentry)
 589 {
 590         int err;
 591         struct p9_fid *dfid, *oldfid;
 592         char *name;
 593         struct v9fs_session_info *v9ses;
 594         struct dentry *dir_dentry;
 595
 596         P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
 597                         dir->i_ino, old_dentry->d_name.name,
 598                         dentry->d_name.name);
 599
 600         v9ses = v9fs_inode2v9ses(dir);
 601         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 602         dfid = v9fs_fid_lookup(dir_dentry);
 603         if (IS_ERR(dfid))
 604                 return PTR_ERR(dfid);
 605
 606         oldfid = v9fs_fid_lookup(old_dentry);
 607         if (IS_ERR(oldfid))
 608                 return PTR_ERR(oldfid);
 609
 610         name = (char *) dentry->d_name.name;
 611
 612         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 613
 614         if (err < 0) {
 615                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 616                 return err;
 617         }
 618
 619         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 620                 /* Get the latest stat info from server. */
 621                 struct p9_fid *fid;
 622                 struct p9_stat_dotl *st;
 623
 624                 fid = v9fs_fid_lookup(old_dentry);
 625                 if (IS_ERR(fid))
 626                         return PTR_ERR(fid);
 627
 628                 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
 629                 if (IS_ERR(st))
 630                         return PTR_ERR(st);
 631
 632                 v9fs_stat2inode_dotl(st, old_dentry->d_inode);
 633
 634                 kfree(st);
 635         } else {
 636                 /* Caching disabled. No need to get upto date stat info.
 637                  * This dentry will be released immediately. So, just hold the
 638                  * inode
 639                  */
 640                 ihold(old_dentry->d_inode);
 641         }
 642         d_instantiate(dentry, old_dentry->d_inode);
 643
 644         return err;
 645 }
 646
 647 /**
 648  * v9fs_vfs_mknod_dotl - create a special file
 649  * @dir: inode destination for new link
 650  * @dentry: dentry for file
 651  * @mode: mode for creation
 652  * @rdev: device associated with special file
 653  *
 654  */
 655 static int
 656 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
 657                 dev_t rdev)
 658 {
 659         int err;
 660         char *name;
 661         mode_t mode;
 662         struct v9fs_session_info *v9ses;
 663         struct p9_fid *fid = NULL, *dfid = NULL;
 664         struct inode *inode;
 665         gid_t gid;
 666         struct p9_qid qid;
 667         struct dentry *dir_dentry;
 668         struct posix_acl *dacl = NULL, *pacl = NULL;
 669
 670         P9_DPRINTK(P9_DEBUG_VFS,
 671                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
 672                 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
 673
 674         if (!new_valid_dev(rdev))
 675                 return -EINVAL;
 676
 677         v9ses = v9fs_inode2v9ses(dir);
 678         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 679         dfid = v9fs_fid_lookup(dir_dentry);
 680         if (IS_ERR(dfid)) {
 681                 err = PTR_ERR(dfid);
 682                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 683                 dfid = NULL;
 684                 goto error;
 685         }
 686
 687         gid = v9fs_get_fsgid_for_create(dir);
 688         mode = omode;
 689         /* Update mode based on ACL value */
 690         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 691         if (err) {
 692                 P9_DPRINTK(P9_DEBUG_VFS,
 693                            "Failed to get acl values in mknod %d\n", err);
 694                 goto error;
 695         }
 696         name = (char *) dentry->d_name.name;
 697
 698         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 699         if (err < 0)
 700                 goto error;
 701
 702         /* instantiate inode and assign the unopened fid to the dentry */
 703         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 704                 fid = p9_client_walk(dfid, 1, &name, 1);
 705                 if (IS_ERR(fid)) {
 706                         err = PTR_ERR(fid);
 707                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 708                                 err);
 709                         fid = NULL;
 710                         goto error;
 711                 }
 712
 713                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 714                 if (IS_ERR(inode)) {
 715                         err = PTR_ERR(inode);
 716                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 717                                 err);
 718                         goto error;
 719                 }
 720                 d_instantiate(dentry, inode);
 721                 err = v9fs_fid_add(dentry, fid);
 722                 if (err < 0)
 723                         goto error;
 724                 fid = NULL;
 725         } else {
 726                 /*
 727                  * Not in cached mode. No need to populate inode with stat.
 728                  * socket syscall returns a fd, so we need instantiate
 729                  */
 730                 inode = v9fs_get_inode(dir->i_sb, mode);
 731                 if (IS_ERR(inode)) {
 732                         err = PTR_ERR(inode);
 733                         goto error;
 734                 }
 735                 d_instantiate(dentry, inode);
 736         }
 737         /* Now set the ACL based on the default value */
 738         v9fs_set_create_acl(dentry, dacl, pacl);
 739 error:
 740         if (fid)
 741                 p9_client_clunk(fid);
 742         return err;
 743 }
 744
 745 /**
 746  * v9fs_vfs_follow_link_dotl - follow a symlink path
 747  * @dentry: dentry for symlink
 748  * @nd: nameidata
 749  *
 750  */
 751
 752 static void *
 753 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
 754 {
 755         int retval;
 756         struct p9_fid *fid;
 757         char *link = __getname();
 758         char *target;
 759
 760         P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
 761
 762         if (!link) {
 763                 link = ERR_PTR(-ENOMEM);
 764                 goto ndset;
 765         }
 766         fid = v9fs_fid_lookup(dentry);
 767         if (IS_ERR(fid)) {
 768                 __putname(link);
 769                 link = ERR_PTR(PTR_ERR(fid));
 770                 goto ndset;
 771         }
 772         retval = p9_client_readlink(fid, &target);
 773         if (!retval) {
 774                 strcpy(link, target);
 775                 kfree(target);
 776                 goto ndset;
 777         }
 778         __putname(link);
 779         link = ERR_PTR(retval);
 780 ndset:
 781         nd_set_link(nd, link);
 782         return NULL;
 783 }
 784
 785 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 786         .create = v9fs_vfs_create_dotl,
 787         .lookup = v9fs_vfs_lookup,
 788         .link = v9fs_vfs_link_dotl,
 789         .symlink = v9fs_vfs_symlink_dotl,
 790         .unlink = v9fs_vfs_unlink,
 791         .mkdir = v9fs_vfs_mkdir_dotl,
 792         .rmdir = v9fs_vfs_rmdir,
 793         .mknod = v9fs_vfs_mknod_dotl,
 794         .rename = v9fs_vfs_rename,
 795         .getattr = v9fs_vfs_getattr_dotl,
 796         .setattr = v9fs_vfs_setattr_dotl,
 797         .setxattr = generic_setxattr,
 798         .getxattr = generic_getxattr,
 799         .removexattr = generic_removexattr,
 800         .listxattr = v9fs_listxattr,
 801         .check_acl = v9fs_check_acl,
 802 };
 803
 804 const struct inode_operations v9fs_file_inode_operations_dotl = {
 805         .getattr = v9fs_vfs_getattr_dotl,
 806         .setattr = v9fs_vfs_setattr_dotl,
 807         .setxattr = generic_setxattr,
 808         .getxattr = generic_getxattr,
 809         .removexattr = generic_removexattr,
 810         .listxattr = v9fs_listxattr,
 811         .check_acl = v9fs_check_acl,
 812 };
 813
 814 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 815         .readlink = generic_readlink,
 816         .follow_link = v9fs_vfs_follow_link_dotl,
 817         .put_link = v9fs_vfs_put_link,
 818         .getattr = v9fs_vfs_getattr_dotl,
 819         .setattr = v9fs_vfs_setattr_dotl,
 820         .setxattr = generic_setxattr,
 821         .getxattr = generic_getxattr,
 822         .removexattr = generic_removexattr,
 823         .listxattr = v9fs_listxattr,
 824 };