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 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
  90                                         struct p9_qid *qid,
  91                                         struct p9_fid *fid,
  92                                         struct p9_stat_dotl *st)
  93 {
  94         int retval;
  95         unsigned long i_ino;
  96         struct inode *inode;
  97         struct v9fs_session_info *v9ses = sb->s_fs_info;
  98
  99         i_ino = v9fs_qid2ino(qid);
 100         inode = iget_locked(sb, i_ino);
 101         if (!inode)
 102                 return ERR_PTR(-ENOMEM);
 103         if (!(inode->i_state & I_NEW))
 104                 return inode;
 105         /*
 106          * initialize the inode with the stat info
 107          * FIXME!! we may need support for stale inodes
 108          * later.
 109          */
 110         retval = v9fs_init_inode(v9ses, inode, st->st_mode);
 111         if (retval)
 112                 goto error;
 113
 114         v9fs_stat2inode_dotl(st, inode);
 115 #ifdef CONFIG_9P_FSCACHE
 116         v9fs_fscache_set_key(inode, &st->qid);
 117         v9fs_cache_inode_get_cookie(inode);
 118 #endif
 119         retval = v9fs_get_acl(inode, fid);
 120         if (retval)
 121                 goto error;
 122
 123         unlock_new_inode(inode);
 124         return inode;
 125 error:
 126         unlock_new_inode(inode);
 127         iput(inode);
 128         return ERR_PTR(retval);
 129
 130 }
 131
 132 struct inode *
 133 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 134                          struct super_block *sb)
 135 {
 136         struct p9_stat_dotl *st;
 137         struct inode *inode = NULL;
 138
 139         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
 140         if (IS_ERR(st))
 141                 return ERR_CAST(st);
 142
 143         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st);
 144         kfree(st);
 145         return inode;
 146 }
 147
 148 /**
 149  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 150  * @dir: directory inode that is being created
 151  * @dentry:  dentry that is being deleted
 152  * @mode: create permissions
 153  * @nd: path information
 154  *
 155  */
 156
 157 static int
 158 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
 159                 struct nameidata *nd)
 160 {
 161         int err = 0;
 162         gid_t gid;
 163         int flags;
 164         mode_t mode;
 165         char *name = NULL;
 166         struct file *filp;
 167         struct p9_qid qid;
 168         struct inode *inode;
 169         struct p9_fid *fid = NULL;
 170         struct v9fs_inode *v9inode;
 171         struct p9_fid *dfid, *ofid, *inode_fid;
 172         struct v9fs_session_info *v9ses;
 173         struct posix_acl *pacl = NULL, *dacl = NULL;
 174
 175         v9ses = v9fs_inode2v9ses(dir);
 176         if (nd && nd->flags & LOOKUP_OPEN)
 177                 flags = nd->intent.open.flags - 1;
 178         else {
 179                 /*
 180                  * create call without LOOKUP_OPEN is due
 181                  * to mknod of regular files. So use mknod
 182                  * operation.
 183                  */
 184                 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 185         }
 186
 187         name = (char *) dentry->d_name.name;
 188         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
 189                         "mode:0x%x\n", name, flags, omode);
 190
 191         dfid = v9fs_fid_lookup(dentry->d_parent);
 192         if (IS_ERR(dfid)) {
 193                 err = PTR_ERR(dfid);
 194                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 195                 return err;
 196         }
 197
 198         /* clone a fid to use for creation */
 199         ofid = p9_client_walk(dfid, 0, NULL, 1);
 200         if (IS_ERR(ofid)) {
 201                 err = PTR_ERR(ofid);
 202                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 203                 return err;
 204         }
 205
 206         gid = v9fs_get_fsgid_for_create(dir);
 207
 208         mode = omode;
 209         /* Update mode based on ACL value */
 210         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 211         if (err) {
 212                 P9_DPRINTK(P9_DEBUG_VFS,
 213                            "Failed to get acl values in creat %d\n", err);
 214                 goto error;
 215         }
 216         err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
 217         if (err < 0) {
 218                 P9_DPRINTK(P9_DEBUG_VFS,
 219                                 "p9_client_open_dotl failed in creat %d\n",
 220                                 err);
 221                 goto error;
 222         }
 223         v9fs_invalidate_inode_attr(dir);
 224
 225         /* instantiate inode and assign the unopened fid to the dentry */
 226         fid = p9_client_walk(dfid, 1, &name, 1);
 227         if (IS_ERR(fid)) {
 228                 err = PTR_ERR(fid);
 229                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 230                 fid = NULL;
 231                 goto error;
 232         }
 233         inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 234         if (IS_ERR(inode)) {
 235                 err = PTR_ERR(inode);
 236                 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 237                 goto error;
 238         }
 239         d_instantiate(dentry, inode);
 240         err = v9fs_fid_add(dentry, fid);
 241         if (err < 0)
 242                 goto error;
 243
 244         /* Now set the ACL based on the default value */
 245         v9fs_set_create_acl(dentry, dacl, pacl);
 246
 247         v9inode = V9FS_I(inode);
 248         mutex_lock(&v9inode->v_mutex);
 249         if (v9ses->cache && !v9inode->writeback_fid &&
 250             ((flags & O_ACCMODE) != O_RDONLY)) {
 251                 /*
 252                  * clone a fid and add it to writeback_fid
 253                  * we do it during open time instead of
 254                  * page dirty time via write_begin/page_mkwrite
 255                  * because we want write after unlink usecase
 256                  * to work.
 257                  */
 258                 inode_fid = v9fs_writeback_fid(dentry);
 259                 if (IS_ERR(inode_fid)) {
 260                         err = PTR_ERR(inode_fid);
 261                         mutex_unlock(&v9inode->v_mutex);
 262                         goto err_clunk_old_fid;
 263                 }
 264                 v9inode->writeback_fid = (void *) inode_fid;
 265         }
 266         mutex_unlock(&v9inode->v_mutex);
 267         /* Since we are opening a file, assign the open fid to the file */
 268         filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
 269         if (IS_ERR(filp)) {
 270                 err = PTR_ERR(filp);
 271                 goto err_clunk_old_fid;
 272         }
 273         filp->private_data = ofid;
 274 #ifdef CONFIG_9P_FSCACHE
 275         if (v9ses->cache)
 276                 v9fs_cache_inode_set_cookie(inode, filp);
 277 #endif
 278         return 0;
 279
 280 error:
 281         if (fid)
 282                 p9_client_clunk(fid);
 283 err_clunk_old_fid:
 284         if (ofid)
 285                 p9_client_clunk(ofid);
 286         return err;
 287 }
 288
 289 /**
 290  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 291  * @dir:  inode that is being unlinked
 292  * @dentry: dentry that is being unlinked
 293  * @mode: mode for new directory
 294  *
 295  */
 296
 297 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 298                                struct dentry *dentry, int omode)
 299 {
 300         int err;
 301         struct v9fs_session_info *v9ses;
 302         struct p9_fid *fid = NULL, *dfid = NULL;
 303         gid_t gid;
 304         char *name;
 305         mode_t mode;
 306         struct inode *inode;
 307         struct p9_qid qid;
 308         struct dentry *dir_dentry;
 309         struct posix_acl *dacl = NULL, *pacl = NULL;
 310
 311         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 312         err = 0;
 313         v9ses = v9fs_inode2v9ses(dir);
 314
 315         omode |= S_IFDIR;
 316         if (dir->i_mode & S_ISGID)
 317                 omode |= S_ISGID;
 318
 319         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 320         dfid = v9fs_fid_lookup(dir_dentry);
 321         if (IS_ERR(dfid)) {
 322                 err = PTR_ERR(dfid);
 323                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 324                 dfid = NULL;
 325                 goto error;
 326         }
 327
 328         gid = v9fs_get_fsgid_for_create(dir);
 329         mode = omode;
 330         /* Update mode based on ACL value */
 331         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 332         if (err) {
 333                 P9_DPRINTK(P9_DEBUG_VFS,
 334                            "Failed to get acl values in mkdir %d\n", err);
 335                 goto error;
 336         }
 337         name = (char *) dentry->d_name.name;
 338         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 339         if (err < 0)
 340                 goto error;
 341
 342         /* instantiate inode and assign the unopened fid to the dentry */
 343         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 344                 fid = p9_client_walk(dfid, 1, &name, 1);
 345                 if (IS_ERR(fid)) {
 346                         err = PTR_ERR(fid);
 347                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 348                                 err);
 349                         fid = NULL;
 350                         goto error;
 351                 }
 352
 353                 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 354                 if (IS_ERR(inode)) {
 355                         err = PTR_ERR(inode);
 356                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 357                                 err);
 358                         goto error;
 359                 }
 360                 d_instantiate(dentry, inode);
 361                 err = v9fs_fid_add(dentry, fid);
 362                 if (err < 0)
 363                         goto error;
 364                 fid = NULL;
 365         } else {
 366                 /*
 367                  * Not in cached mode. No need to populate
 368                  * inode with stat. We need to get an inode
 369                  * so that we can set the acl with dentry
 370                  */
 371                 inode = v9fs_get_inode(dir->i_sb, mode);
 372                 if (IS_ERR(inode)) {
 373                         err = PTR_ERR(inode);
 374                         goto error;
 375                 }
 376                 d_instantiate(dentry, inode);
 377         }
 378         /* Now set the ACL based on the default value */
 379         v9fs_set_create_acl(dentry, dacl, pacl);
 380         inc_nlink(dir);
 381         v9fs_invalidate_inode_attr(dir);
 382 error:
 383         if (fid)
 384                 p9_client_clunk(fid);
 385         return err;
 386 }
 387
 388 static int
 389 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 390                  struct kstat *stat)
 391 {
 392         int err;
 393         struct v9fs_session_info *v9ses;
 394         struct p9_fid *fid;
 395         struct p9_stat_dotl *st;
 396
 397         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 398         err = -EPERM;
 399         v9ses = v9fs_dentry2v9ses(dentry);
 400         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 401                 generic_fillattr(dentry->d_inode, stat);
 402                 return 0;
 403         }
 404         fid = v9fs_fid_lookup(dentry);
 405         if (IS_ERR(fid))
 406                 return PTR_ERR(fid);
 407
 408         /* Ask for all the fields in stat structure. Server will return
 409          * whatever it supports
 410          */
 411
 412         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 413         if (IS_ERR(st))
 414                 return PTR_ERR(st);
 415
 416         v9fs_stat2inode_dotl(st, dentry->d_inode);
 417         generic_fillattr(dentry->d_inode, stat);
 418         /* Change block size to what the server returned */
 419         stat->blksize = st->st_blksize;
 420
 421         kfree(st);
 422         return 0;
 423 }
 424
 425 /**
 426  * v9fs_vfs_setattr_dotl - set file metadata
 427  * @dentry: file whose metadata to set
 428  * @iattr: metadata assignment structure
 429  *
 430  */
 431
 432 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 433 {
 434         int retval;
 435         struct v9fs_session_info *v9ses;
 436         struct p9_fid *fid;
 437         struct p9_iattr_dotl p9attr;
 438
 439         P9_DPRINTK(P9_DEBUG_VFS, "\n");
 440
 441         retval = inode_change_ok(dentry->d_inode, iattr);
 442         if (retval)
 443                 return retval;
 444
 445         p9attr.valid = iattr->ia_valid;
 446         p9attr.mode = iattr->ia_mode;
 447         p9attr.uid = iattr->ia_uid;
 448         p9attr.gid = iattr->ia_gid;
 449         p9attr.size = iattr->ia_size;
 450         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 451         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 452         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 453         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 454
 455         retval = -EPERM;
 456         v9ses = v9fs_dentry2v9ses(dentry);
 457         fid = v9fs_fid_lookup(dentry);
 458         if (IS_ERR(fid))
 459                 return PTR_ERR(fid);
 460
 461         /* Write all dirty data */
 462         if (S_ISREG(dentry->d_inode->i_mode))
 463                 filemap_write_and_wait(dentry->d_inode->i_mapping);
 464
 465         retval = p9_client_setattr(fid, &p9attr);
 466         if (retval < 0)
 467                 return retval;
 468
 469         if ((iattr->ia_valid & ATTR_SIZE) &&
 470             iattr->ia_size != i_size_read(dentry->d_inode))
 471                 truncate_setsize(dentry->d_inode, iattr->ia_size);
 472
 473         v9fs_invalidate_inode_attr(dentry->d_inode);
 474         setattr_copy(dentry->d_inode, iattr);
 475         mark_inode_dirty(dentry->d_inode);
 476         if (iattr->ia_valid & ATTR_MODE) {
 477                 /* We also want to update ACL when we update mode bits */
 478                 retval = v9fs_acl_chmod(dentry);
 479                 if (retval < 0)
 480                         return retval;
 481         }
 482         return 0;
 483 }
 484
 485 /**
 486  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 487  * @stat: stat structure
 488  * @inode: inode to populate
 489  * @sb: superblock of filesystem
 490  *
 491  */
 492
 493 void
 494 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 495 {
 496         struct v9fs_inode *v9inode = V9FS_I(inode);
 497
 498         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 499                 inode->i_atime.tv_sec = stat->st_atime_sec;
 500                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 501                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 502                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 503                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 504                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 505                 inode->i_uid = stat->st_uid;
 506                 inode->i_gid = stat->st_gid;
 507                 inode->i_nlink = stat->st_nlink;
 508                 inode->i_mode = stat->st_mode;
 509                 inode->i_rdev = new_decode_dev(stat->st_rdev);
 510
 511                 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
 512                         init_special_inode(inode, inode->i_mode, inode->i_rdev);
 513
 514                 i_size_write(inode, stat->st_size);
 515                 inode->i_blocks = stat->st_blocks;
 516         } else {
 517                 if (stat->st_result_mask & P9_STATS_ATIME) {
 518                         inode->i_atime.tv_sec = stat->st_atime_sec;
 519                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 520                 }
 521                 if (stat->st_result_mask & P9_STATS_MTIME) {
 522                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 523                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 524                 }
 525                 if (stat->st_result_mask & P9_STATS_CTIME) {
 526                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 527                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 528                 }
 529                 if (stat->st_result_mask & P9_STATS_UID)
 530                         inode->i_uid = stat->st_uid;
 531                 if (stat->st_result_mask & P9_STATS_GID)
 532                         inode->i_gid = stat->st_gid;
 533                 if (stat->st_result_mask & P9_STATS_NLINK)
 534                         inode->i_nlink = stat->st_nlink;
 535                 if (stat->st_result_mask & P9_STATS_MODE) {
 536                         inode->i_mode = stat->st_mode;
 537                         if ((S_ISBLK(inode->i_mode)) ||
 538                                                 (S_ISCHR(inode->i_mode)))
 539                                 init_special_inode(inode, inode->i_mode,
 540                                                                 inode->i_rdev);
 541                 }
 542                 if (stat->st_result_mask & P9_STATS_RDEV)
 543                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 544                 if (stat->st_result_mask & P9_STATS_SIZE)
 545                         i_size_write(inode, stat->st_size);
 546                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 547                         inode->i_blocks = stat->st_blocks;
 548         }
 549         if (stat->st_result_mask & P9_STATS_GEN)
 550                         inode->i_generation = stat->st_gen;
 551
 552         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 553          * because the inode structure does not have fields for them.
 554          */
 555         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 556 }
 557
 558 static int
 559 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 560                 const char *symname)
 561 {
 562         int err;
 563         gid_t gid;
 564         char *name;
 565         struct p9_qid qid;
 566         struct inode *inode;
 567         struct p9_fid *dfid;
 568         struct p9_fid *fid = NULL;
 569         struct v9fs_session_info *v9ses;
 570
 571         name = (char *) dentry->d_name.name;
 572         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
 573                         dir->i_ino, name, symname);
 574         v9ses = v9fs_inode2v9ses(dir);
 575
 576         dfid = v9fs_fid_lookup(dentry->d_parent);
 577         if (IS_ERR(dfid)) {
 578                 err = PTR_ERR(dfid);
 579                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 580                 return err;
 581         }
 582
 583         gid = v9fs_get_fsgid_for_create(dir);
 584
 585         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 586         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 587
 588         if (err < 0) {
 589                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 590                 goto error;
 591         }
 592
 593         v9fs_invalidate_inode_attr(dir);
 594         if (v9ses->cache) {
 595                 /* Now walk from the parent so we can get an unopened fid. */
 596                 fid = p9_client_walk(dfid, 1, &name, 1);
 597                 if (IS_ERR(fid)) {
 598                         err = PTR_ERR(fid);
 599                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 600                                         err);
 601                         fid = NULL;
 602                         goto error;
 603                 }
 604
 605                 /* instantiate inode and assign the unopened fid to dentry */
 606                 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 607                 if (IS_ERR(inode)) {
 608                         err = PTR_ERR(inode);
 609                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 610                                         err);
 611                         goto error;
 612                 }
 613                 d_instantiate(dentry, inode);
 614                 err = v9fs_fid_add(dentry, fid);
 615                 if (err < 0)
 616                         goto error;
 617                 fid = NULL;
 618         } else {
 619                 /* Not in cached mode. No need to populate inode with stat */
 620                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
 621                 if (IS_ERR(inode)) {
 622                         err = PTR_ERR(inode);
 623                         goto error;
 624                 }
 625                 d_instantiate(dentry, inode);
 626         }
 627
 628 error:
 629         if (fid)
 630                 p9_client_clunk(fid);
 631
 632         return err;
 633 }
 634
 635 /**
 636  * v9fs_vfs_link_dotl - create a hardlink for dotl
 637  * @old_dentry: dentry for file to link to
 638  * @dir: inode destination for new link
 639  * @dentry: dentry for link
 640  *
 641  */
 642
 643 static int
 644 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 645                 struct dentry *dentry)
 646 {
 647         int err;
 648         char *name;
 649         struct dentry *dir_dentry;
 650         struct p9_fid *dfid, *oldfid;
 651         struct v9fs_session_info *v9ses;
 652
 653         P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
 654                         dir->i_ino, old_dentry->d_name.name,
 655                         dentry->d_name.name);
 656
 657         v9ses = v9fs_inode2v9ses(dir);
 658         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 659         dfid = v9fs_fid_lookup(dir_dentry);
 660         if (IS_ERR(dfid))
 661                 return PTR_ERR(dfid);
 662
 663         oldfid = v9fs_fid_lookup(old_dentry);
 664         if (IS_ERR(oldfid))
 665                 return PTR_ERR(oldfid);
 666
 667         name = (char *) dentry->d_name.name;
 668
 669         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 670
 671         if (err < 0) {
 672                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 673                 return err;
 674         }
 675
 676         v9fs_invalidate_inode_attr(dir);
 677         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 678                 /* Get the latest stat info from server. */
 679                 struct p9_fid *fid;
 680                 fid = v9fs_fid_lookup(old_dentry);
 681                 if (IS_ERR(fid))
 682                         return PTR_ERR(fid);
 683
 684                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
 685         }
 686         ihold(old_dentry->d_inode);
 687         d_instantiate(dentry, old_dentry->d_inode);
 688
 689         return err;
 690 }
 691
 692 /**
 693  * v9fs_vfs_mknod_dotl - create a special file
 694  * @dir: inode destination for new link
 695  * @dentry: dentry for file
 696  * @mode: mode for creation
 697  * @rdev: device associated with special file
 698  *
 699  */
 700 static int
 701 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
 702                 dev_t rdev)
 703 {
 704         int err;
 705         gid_t gid;
 706         char *name;
 707         mode_t mode;
 708         struct v9fs_session_info *v9ses;
 709         struct p9_fid *fid = NULL, *dfid = NULL;
 710         struct inode *inode;
 711         struct p9_qid qid;
 712         struct dentry *dir_dentry;
 713         struct posix_acl *dacl = NULL, *pacl = NULL;
 714
 715         P9_DPRINTK(P9_DEBUG_VFS,
 716                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
 717                 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
 718
 719         if (!new_valid_dev(rdev))
 720                 return -EINVAL;
 721
 722         v9ses = v9fs_inode2v9ses(dir);
 723         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 724         dfid = v9fs_fid_lookup(dir_dentry);
 725         if (IS_ERR(dfid)) {
 726                 err = PTR_ERR(dfid);
 727                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 728                 dfid = NULL;
 729                 goto error;
 730         }
 731
 732         gid = v9fs_get_fsgid_for_create(dir);
 733         mode = omode;
 734         /* Update mode based on ACL value */
 735         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 736         if (err) {
 737                 P9_DPRINTK(P9_DEBUG_VFS,
 738                            "Failed to get acl values in mknod %d\n", err);
 739                 goto error;
 740         }
 741         name = (char *) dentry->d_name.name;
 742
 743         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 744         if (err < 0)
 745                 goto error;
 746
 747         v9fs_invalidate_inode_attr(dir);
 748         /* instantiate inode and assign the unopened fid to the dentry */
 749         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 750                 fid = p9_client_walk(dfid, 1, &name, 1);
 751                 if (IS_ERR(fid)) {
 752                         err = PTR_ERR(fid);
 753                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 754                                 err);
 755                         fid = NULL;
 756                         goto error;
 757                 }
 758
 759                 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 760                 if (IS_ERR(inode)) {
 761                         err = PTR_ERR(inode);
 762                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 763                                 err);
 764                         goto error;
 765                 }
 766                 d_instantiate(dentry, inode);
 767                 err = v9fs_fid_add(dentry, fid);
 768                 if (err < 0)
 769                         goto error;
 770                 fid = NULL;
 771         } else {
 772                 /*
 773                  * Not in cached mode. No need to populate inode with stat.
 774                  * socket syscall returns a fd, so we need instantiate
 775                  */
 776                 inode = v9fs_get_inode(dir->i_sb, mode);
 777                 if (IS_ERR(inode)) {
 778                         err = PTR_ERR(inode);
 779                         goto error;
 780                 }
 781                 d_instantiate(dentry, inode);
 782         }
 783         /* Now set the ACL based on the default value */
 784         v9fs_set_create_acl(dentry, dacl, pacl);
 785 error:
 786         if (fid)
 787                 p9_client_clunk(fid);
 788         return err;
 789 }
 790
 791 /**
 792  * v9fs_vfs_follow_link_dotl - follow a symlink path
 793  * @dentry: dentry for symlink
 794  * @nd: nameidata
 795  *
 796  */
 797
 798 static void *
 799 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
 800 {
 801         int retval;
 802         struct p9_fid *fid;
 803         char *link = __getname();
 804         char *target;
 805
 806         P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
 807
 808         if (!link) {
 809                 link = ERR_PTR(-ENOMEM);
 810                 goto ndset;
 811         }
 812         fid = v9fs_fid_lookup(dentry);
 813         if (IS_ERR(fid)) {
 814                 __putname(link);
 815                 link = ERR_CAST(fid);
 816                 goto ndset;
 817         }
 818         retval = p9_client_readlink(fid, &target);
 819         if (!retval) {
 820                 strcpy(link, target);
 821                 kfree(target);
 822                 goto ndset;
 823         }
 824         __putname(link);
 825         link = ERR_PTR(retval);
 826 ndset:
 827         nd_set_link(nd, link);
 828         return NULL;
 829 }
 830
 831 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 832 {
 833         loff_t i_size;
 834         struct p9_stat_dotl *st;
 835         struct v9fs_session_info *v9ses;
 836
 837         v9ses = v9fs_inode2v9ses(inode);
 838         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 839         if (IS_ERR(st))
 840                 return PTR_ERR(st);
 841
 842         spin_lock(&inode->i_lock);
 843         /*
 844          * We don't want to refresh inode->i_size,
 845          * because we may have cached data
 846          */
 847         i_size = inode->i_size;
 848         v9fs_stat2inode_dotl(st, inode);
 849         if (v9ses->cache)
 850                 inode->i_size = i_size;
 851         spin_unlock(&inode->i_lock);
 852         kfree(st);
 853         return 0;
 854 }
 855
 856 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 857         .create = v9fs_vfs_create_dotl,
 858         .lookup = v9fs_vfs_lookup,
 859         .link = v9fs_vfs_link_dotl,
 860         .symlink = v9fs_vfs_symlink_dotl,
 861         .unlink = v9fs_vfs_unlink,
 862         .mkdir = v9fs_vfs_mkdir_dotl,
 863         .rmdir = v9fs_vfs_rmdir,
 864         .mknod = v9fs_vfs_mknod_dotl,
 865         .rename = v9fs_vfs_rename,
 866         .getattr = v9fs_vfs_getattr_dotl,
 867         .setattr = v9fs_vfs_setattr_dotl,
 868         .setxattr = generic_setxattr,
 869         .getxattr = generic_getxattr,
 870         .removexattr = generic_removexattr,
 871         .listxattr = v9fs_listxattr,
 872         .check_acl = v9fs_check_acl,
 873 };
 874
 875 const struct inode_operations v9fs_file_inode_operations_dotl = {
 876         .getattr = v9fs_vfs_getattr_dotl,
 877         .setattr = v9fs_vfs_setattr_dotl,
 878         .setxattr = generic_setxattr,
 879         .getxattr = generic_getxattr,
 880         .removexattr = generic_removexattr,
 881         .listxattr = v9fs_listxattr,
 882         .check_acl = v9fs_check_acl,
 883 };
 884
 885 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 886         .readlink = generic_readlink,
 887         .follow_link = v9fs_vfs_follow_link_dotl,
 888         .put_link = v9fs_vfs_put_link,
 889         .getattr = v9fs_vfs_getattr_dotl,
 890         .setattr = v9fs_vfs_setattr_dotl,
 891         .setxattr = generic_setxattr,
 892         .getxattr = generic_getxattr,
 893         .removexattr = generic_removexattr,
 894         .listxattr = v9fs_listxattr,
 895 };