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 error;
 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                 p9_client_clunk(ofid);
 271                 return PTR_ERR(filp);
 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 (ofid)
 282                 p9_client_clunk(ofid);
 283         if (fid)
 284                 p9_client_clunk(fid);
 285         return err;
 286 }
 287
 288 /**
 289  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 290  * @dir:  inode that is being unlinked
 291  * @dentry: dentry that is being unlinked
 292  * @mode: mode for new directory
 293  *
 294  */
 295
 296 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 297                                struct dentry *dentry, int omode)
 298 {
 299         int err;
 300         struct v9fs_session_info *v9ses;
 301         struct p9_fid *fid = NULL, *dfid = NULL;
 302         gid_t gid;
 303         char *name;
 304         mode_t mode;
 305         struct inode *inode;
 306         struct p9_qid qid;
 307         struct dentry *dir_dentry;
 308         struct posix_acl *dacl = NULL, *pacl = NULL;
 309
 310         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 311         err = 0;
 312         v9ses = v9fs_inode2v9ses(dir);
 313
 314         omode |= S_IFDIR;
 315         if (dir->i_mode & S_ISGID)
 316                 omode |= S_ISGID;
 317
 318         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 319         dfid = v9fs_fid_lookup(dir_dentry);
 320         if (IS_ERR(dfid)) {
 321                 err = PTR_ERR(dfid);
 322                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 323                 dfid = NULL;
 324                 goto error;
 325         }
 326
 327         gid = v9fs_get_fsgid_for_create(dir);
 328         mode = omode;
 329         /* Update mode based on ACL value */
 330         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 331         if (err) {
 332                 P9_DPRINTK(P9_DEBUG_VFS,
 333                            "Failed to get acl values in mkdir %d\n", err);
 334                 goto error;
 335         }
 336         name = (char *) dentry->d_name.name;
 337         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 338         if (err < 0)
 339                 goto error;
 340
 341         /* instantiate inode and assign the unopened fid to the dentry */
 342         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 343                 fid = p9_client_walk(dfid, 1, &name, 1);
 344                 if (IS_ERR(fid)) {
 345                         err = PTR_ERR(fid);
 346                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 347                                 err);
 348                         fid = NULL;
 349                         goto error;
 350                 }
 351
 352                 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 353                 if (IS_ERR(inode)) {
 354                         err = PTR_ERR(inode);
 355                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 356                                 err);
 357                         goto error;
 358                 }
 359                 d_instantiate(dentry, inode);
 360                 err = v9fs_fid_add(dentry, fid);
 361                 if (err < 0)
 362                         goto error;
 363                 fid = NULL;
 364         } else {
 365                 /*
 366                  * Not in cached mode. No need to populate
 367                  * inode with stat. We need to get an inode
 368                  * so that we can set the acl with dentry
 369                  */
 370                 inode = v9fs_get_inode(dir->i_sb, mode);
 371                 if (IS_ERR(inode)) {
 372                         err = PTR_ERR(inode);
 373                         goto error;
 374                 }
 375                 d_instantiate(dentry, inode);
 376         }
 377         /* Now set the ACL based on the default value */
 378         v9fs_set_create_acl(dentry, dacl, pacl);
 379         inc_nlink(dir);
 380         v9fs_invalidate_inode_attr(dir);
 381 error:
 382         if (fid)
 383                 p9_client_clunk(fid);
 384         return err;
 385 }
 386
 387 static int
 388 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 389                  struct kstat *stat)
 390 {
 391         int err;
 392         struct v9fs_session_info *v9ses;
 393         struct p9_fid *fid;
 394         struct p9_stat_dotl *st;
 395
 396         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 397         err = -EPERM;
 398         v9ses = v9fs_dentry2v9ses(dentry);
 399         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 400                 generic_fillattr(dentry->d_inode, stat);
 401                 return 0;
 402         }
 403         fid = v9fs_fid_lookup(dentry);
 404         if (IS_ERR(fid))
 405                 return PTR_ERR(fid);
 406
 407         /* Ask for all the fields in stat structure. Server will return
 408          * whatever it supports
 409          */
 410
 411         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 412         if (IS_ERR(st))
 413                 return PTR_ERR(st);
 414
 415         v9fs_stat2inode_dotl(st, dentry->d_inode);
 416         generic_fillattr(dentry->d_inode, stat);
 417         /* Change block size to what the server returned */
 418         stat->blksize = st->st_blksize;
 419
 420         kfree(st);
 421         return 0;
 422 }
 423
 424 /**
 425  * v9fs_vfs_setattr_dotl - set file metadata
 426  * @dentry: file whose metadata to set
 427  * @iattr: metadata assignment structure
 428  *
 429  */
 430
 431 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 432 {
 433         int retval;
 434         struct v9fs_session_info *v9ses;
 435         struct p9_fid *fid;
 436         struct p9_iattr_dotl p9attr;
 437
 438         P9_DPRINTK(P9_DEBUG_VFS, "\n");
 439
 440         retval = inode_change_ok(dentry->d_inode, iattr);
 441         if (retval)
 442                 return retval;
 443
 444         p9attr.valid = iattr->ia_valid;
 445         p9attr.mode = iattr->ia_mode;
 446         p9attr.uid = iattr->ia_uid;
 447         p9attr.gid = iattr->ia_gid;
 448         p9attr.size = iattr->ia_size;
 449         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 450         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 451         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 452         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 453
 454         retval = -EPERM;
 455         v9ses = v9fs_dentry2v9ses(dentry);
 456         fid = v9fs_fid_lookup(dentry);
 457         if (IS_ERR(fid))
 458                 return PTR_ERR(fid);
 459
 460         /* Write all dirty data */
 461         if (S_ISREG(dentry->d_inode->i_mode))
 462                 filemap_write_and_wait(dentry->d_inode->i_mapping);
 463
 464         retval = p9_client_setattr(fid, &p9attr);
 465         if (retval < 0)
 466                 return retval;
 467
 468         if ((iattr->ia_valid & ATTR_SIZE) &&
 469             iattr->ia_size != i_size_read(dentry->d_inode))
 470                 truncate_setsize(dentry->d_inode, iattr->ia_size);
 471
 472         v9fs_invalidate_inode_attr(dentry->d_inode);
 473         setattr_copy(dentry->d_inode, iattr);
 474         mark_inode_dirty(dentry->d_inode);
 475         if (iattr->ia_valid & ATTR_MODE) {
 476                 /* We also want to update ACL when we update mode bits */
 477                 retval = v9fs_acl_chmod(dentry);
 478                 if (retval < 0)
 479                         return retval;
 480         }
 481         return 0;
 482 }
 483
 484 /**
 485  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 486  * @stat: stat structure
 487  * @inode: inode to populate
 488  * @sb: superblock of filesystem
 489  *
 490  */
 491
 492 void
 493 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 494 {
 495         struct v9fs_inode *v9inode = V9FS_I(inode);
 496
 497         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 498                 inode->i_atime.tv_sec = stat->st_atime_sec;
 499                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 500                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 501                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 502                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 503                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 504                 inode->i_uid = stat->st_uid;
 505                 inode->i_gid = stat->st_gid;
 506                 inode->i_nlink = stat->st_nlink;
 507                 inode->i_mode = stat->st_mode;
 508                 inode->i_rdev = new_decode_dev(stat->st_rdev);
 509
 510                 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
 511                         init_special_inode(inode, inode->i_mode, inode->i_rdev);
 512
 513                 i_size_write(inode, stat->st_size);
 514                 inode->i_blocks = stat->st_blocks;
 515         } else {
 516                 if (stat->st_result_mask & P9_STATS_ATIME) {
 517                         inode->i_atime.tv_sec = stat->st_atime_sec;
 518                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 519                 }
 520                 if (stat->st_result_mask & P9_STATS_MTIME) {
 521                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 522                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 523                 }
 524                 if (stat->st_result_mask & P9_STATS_CTIME) {
 525                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 526                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 527                 }
 528                 if (stat->st_result_mask & P9_STATS_UID)
 529                         inode->i_uid = stat->st_uid;
 530                 if (stat->st_result_mask & P9_STATS_GID)
 531                         inode->i_gid = stat->st_gid;
 532                 if (stat->st_result_mask & P9_STATS_NLINK)
 533                         inode->i_nlink = stat->st_nlink;
 534                 if (stat->st_result_mask & P9_STATS_MODE) {
 535                         inode->i_mode = stat->st_mode;
 536                         if ((S_ISBLK(inode->i_mode)) ||
 537                                                 (S_ISCHR(inode->i_mode)))
 538                                 init_special_inode(inode, inode->i_mode,
 539                                                                 inode->i_rdev);
 540                 }
 541                 if (stat->st_result_mask & P9_STATS_RDEV)
 542                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 543                 if (stat->st_result_mask & P9_STATS_SIZE)
 544                         i_size_write(inode, stat->st_size);
 545                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 546                         inode->i_blocks = stat->st_blocks;
 547         }
 548         if (stat->st_result_mask & P9_STATS_GEN)
 549                         inode->i_generation = stat->st_gen;
 550
 551         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 552          * because the inode structure does not have fields for them.
 553          */
 554         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 555 }
 556
 557 static int
 558 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 559                 const char *symname)
 560 {
 561         int err;
 562         gid_t gid;
 563         char *name;
 564         struct p9_qid qid;
 565         struct inode *inode;
 566         struct p9_fid *dfid;
 567         struct p9_fid *fid = NULL;
 568         struct v9fs_session_info *v9ses;
 569
 570         name = (char *) dentry->d_name.name;
 571         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
 572                         dir->i_ino, name, symname);
 573         v9ses = v9fs_inode2v9ses(dir);
 574
 575         dfid = v9fs_fid_lookup(dentry->d_parent);
 576         if (IS_ERR(dfid)) {
 577                 err = PTR_ERR(dfid);
 578                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 579                 return err;
 580         }
 581
 582         gid = v9fs_get_fsgid_for_create(dir);
 583
 584         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 585         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 586
 587         if (err < 0) {
 588                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 589                 goto error;
 590         }
 591
 592         v9fs_invalidate_inode_attr(dir);
 593         if (v9ses->cache) {
 594                 /* Now walk from the parent so we can get an unopened fid. */
 595                 fid = p9_client_walk(dfid, 1, &name, 1);
 596                 if (IS_ERR(fid)) {
 597                         err = PTR_ERR(fid);
 598                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 599                                         err);
 600                         fid = NULL;
 601                         goto error;
 602                 }
 603
 604                 /* instantiate inode and assign the unopened fid to dentry */
 605                 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 606                 if (IS_ERR(inode)) {
 607                         err = PTR_ERR(inode);
 608                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 609                                         err);
 610                         goto error;
 611                 }
 612                 d_instantiate(dentry, inode);
 613                 err = v9fs_fid_add(dentry, fid);
 614                 if (err < 0)
 615                         goto error;
 616                 fid = NULL;
 617         } else {
 618                 /* Not in cached mode. No need to populate inode with stat */
 619                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
 620                 if (IS_ERR(inode)) {
 621                         err = PTR_ERR(inode);
 622                         goto error;
 623                 }
 624                 d_instantiate(dentry, inode);
 625         }
 626
 627 error:
 628         if (fid)
 629                 p9_client_clunk(fid);
 630
 631         return err;
 632 }
 633
 634 /**
 635  * v9fs_vfs_link_dotl - create a hardlink for dotl
 636  * @old_dentry: dentry for file to link to
 637  * @dir: inode destination for new link
 638  * @dentry: dentry for link
 639  *
 640  */
 641
 642 static int
 643 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 644                 struct dentry *dentry)
 645 {
 646         int err;
 647         char *name;
 648         struct dentry *dir_dentry;
 649         struct p9_fid *dfid, *oldfid;
 650         struct v9fs_session_info *v9ses;
 651
 652         P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
 653                         dir->i_ino, old_dentry->d_name.name,
 654                         dentry->d_name.name);
 655
 656         v9ses = v9fs_inode2v9ses(dir);
 657         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 658         dfid = v9fs_fid_lookup(dir_dentry);
 659         if (IS_ERR(dfid))
 660                 return PTR_ERR(dfid);
 661
 662         oldfid = v9fs_fid_lookup(old_dentry);
 663         if (IS_ERR(oldfid))
 664                 return PTR_ERR(oldfid);
 665
 666         name = (char *) dentry->d_name.name;
 667
 668         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 669
 670         if (err < 0) {
 671                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 672                 return err;
 673         }
 674
 675         v9fs_invalidate_inode_attr(dir);
 676         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 677                 /* Get the latest stat info from server. */
 678                 struct p9_fid *fid;
 679                 fid = v9fs_fid_lookup(old_dentry);
 680                 if (IS_ERR(fid))
 681                         return PTR_ERR(fid);
 682
 683                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
 684         }
 685         ihold(old_dentry->d_inode);
 686         d_instantiate(dentry, old_dentry->d_inode);
 687
 688         return err;
 689 }
 690
 691 /**
 692  * v9fs_vfs_mknod_dotl - create a special file
 693  * @dir: inode destination for new link
 694  * @dentry: dentry for file
 695  * @mode: mode for creation
 696  * @rdev: device associated with special file
 697  *
 698  */
 699 static int
 700 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
 701                 dev_t rdev)
 702 {
 703         int err;
 704         gid_t gid;
 705         char *name;
 706         mode_t mode;
 707         struct v9fs_session_info *v9ses;
 708         struct p9_fid *fid = NULL, *dfid = NULL;
 709         struct inode *inode;
 710         struct p9_qid qid;
 711         struct dentry *dir_dentry;
 712         struct posix_acl *dacl = NULL, *pacl = NULL;
 713
 714         P9_DPRINTK(P9_DEBUG_VFS,
 715                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
 716                 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
 717
 718         if (!new_valid_dev(rdev))
 719                 return -EINVAL;
 720
 721         v9ses = v9fs_inode2v9ses(dir);
 722         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 723         dfid = v9fs_fid_lookup(dir_dentry);
 724         if (IS_ERR(dfid)) {
 725                 err = PTR_ERR(dfid);
 726                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 727                 dfid = NULL;
 728                 goto error;
 729         }
 730
 731         gid = v9fs_get_fsgid_for_create(dir);
 732         mode = omode;
 733         /* Update mode based on ACL value */
 734         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 735         if (err) {
 736                 P9_DPRINTK(P9_DEBUG_VFS,
 737                            "Failed to get acl values in mknod %d\n", err);
 738                 goto error;
 739         }
 740         name = (char *) dentry->d_name.name;
 741
 742         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 743         if (err < 0)
 744                 goto error;
 745
 746         v9fs_invalidate_inode_attr(dir);
 747         /* instantiate inode and assign the unopened fid to the dentry */
 748         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 749                 fid = p9_client_walk(dfid, 1, &name, 1);
 750                 if (IS_ERR(fid)) {
 751                         err = PTR_ERR(fid);
 752                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 753                                 err);
 754                         fid = NULL;
 755                         goto error;
 756                 }
 757
 758                 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 759                 if (IS_ERR(inode)) {
 760                         err = PTR_ERR(inode);
 761                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 762                                 err);
 763                         goto error;
 764                 }
 765                 d_instantiate(dentry, inode);
 766                 err = v9fs_fid_add(dentry, fid);
 767                 if (err < 0)
 768                         goto error;
 769                 fid = NULL;
 770         } else {
 771                 /*
 772                  * Not in cached mode. No need to populate inode with stat.
 773                  * socket syscall returns a fd, so we need instantiate
 774                  */
 775                 inode = v9fs_get_inode(dir->i_sb, mode);
 776                 if (IS_ERR(inode)) {
 777                         err = PTR_ERR(inode);
 778                         goto error;
 779                 }
 780                 d_instantiate(dentry, inode);
 781         }
 782         /* Now set the ACL based on the default value */
 783         v9fs_set_create_acl(dentry, dacl, pacl);
 784 error:
 785         if (fid)
 786                 p9_client_clunk(fid);
 787         return err;
 788 }
 789
 790 /**
 791  * v9fs_vfs_follow_link_dotl - follow a symlink path
 792  * @dentry: dentry for symlink
 793  * @nd: nameidata
 794  *
 795  */
 796
 797 static void *
 798 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
 799 {
 800         int retval;
 801         struct p9_fid *fid;
 802         char *link = __getname();
 803         char *target;
 804
 805         P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
 806
 807         if (!link) {
 808                 link = ERR_PTR(-ENOMEM);
 809                 goto ndset;
 810         }
 811         fid = v9fs_fid_lookup(dentry);
 812         if (IS_ERR(fid)) {
 813                 __putname(link);
 814                 link = ERR_PTR(PTR_ERR(fid));
 815                 goto ndset;
 816         }
 817         retval = p9_client_readlink(fid, &target);
 818         if (!retval) {
 819                 strcpy(link, target);
 820                 kfree(target);
 821                 goto ndset;
 822         }
 823         __putname(link);
 824         link = ERR_PTR(retval);
 825 ndset:
 826         nd_set_link(nd, link);
 827         return NULL;
 828 }
 829
 830 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 831 {
 832         loff_t i_size;
 833         struct p9_stat_dotl *st;
 834         struct v9fs_session_info *v9ses;
 835
 836         v9ses = v9fs_inode2v9ses(inode);
 837         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 838         if (IS_ERR(st))
 839                 return PTR_ERR(st);
 840
 841         spin_lock(&inode->i_lock);
 842         /*
 843          * We don't want to refresh inode->i_size,
 844          * because we may have cached data
 845          */
 846         i_size = inode->i_size;
 847         v9fs_stat2inode_dotl(st, inode);
 848         if (v9ses->cache)
 849                 inode->i_size = i_size;
 850         spin_unlock(&inode->i_lock);
 851         kfree(st);
 852         return 0;
 853 }
 854
 855 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 856         .create = v9fs_vfs_create_dotl,
 857         .lookup = v9fs_vfs_lookup,
 858         .link = v9fs_vfs_link_dotl,
 859         .symlink = v9fs_vfs_symlink_dotl,
 860         .unlink = v9fs_vfs_unlink,
 861         .mkdir = v9fs_vfs_mkdir_dotl,
 862         .rmdir = v9fs_vfs_rmdir,
 863         .mknod = v9fs_vfs_mknod_dotl,
 864         .rename = v9fs_vfs_rename,
 865         .getattr = v9fs_vfs_getattr_dotl,
 866         .setattr = v9fs_vfs_setattr_dotl,
 867         .setxattr = generic_setxattr,
 868         .getxattr = generic_getxattr,
 869         .removexattr = generic_removexattr,
 870         .listxattr = v9fs_listxattr,
 871         .check_acl = v9fs_check_acl,
 872 };
 873
 874 const struct inode_operations v9fs_file_inode_operations_dotl = {
 875         .getattr = v9fs_vfs_getattr_dotl,
 876         .setattr = v9fs_vfs_setattr_dotl,
 877         .setxattr = generic_setxattr,
 878         .getxattr = generic_getxattr,
 879         .removexattr = generic_removexattr,
 880         .listxattr = v9fs_listxattr,
 881         .check_acl = v9fs_check_acl,
 882 };
 883
 884 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 885         .readlink = generic_readlink,
 886         .follow_link = v9fs_vfs_follow_link_dotl,
 887         .put_link = v9fs_vfs_put_link,
 888         .getattr = v9fs_vfs_getattr_dotl,
 889         .setattr = v9fs_vfs_setattr_dotl,
 890         .setxattr = generic_setxattr,
 891         .getxattr = generic_getxattr,
 892         .removexattr = generic_removexattr,
 893         .listxattr = v9fs_listxattr,
 894 };