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 int v9fs_test_inode_dotl(struct inode *inode, void *data)
  90 {
  91         struct v9fs_inode *v9inode = V9FS_I(inode);
  92         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
  93
  94         /* don't match inode of different type */
  95         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
  96                 return 0;
  97
  98         if (inode->i_generation != st->st_gen)
  99                 return 0;
 100
 101         /* compare qid details */
 102         if (memcmp(&v9inode->qid.version,
 103                    &st->qid.version, sizeof(v9inode->qid.version)))
 104                 return 0;
 105
 106         if (v9inode->qid.type != st->qid.type)
 107                 return 0;
 108         return 1;
 109 }
 110
 111 /* Always get a new inode */
 112 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
 113 {
 114         return 0;
 115 }
 116
 117 static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
 118 {
 119         struct v9fs_inode *v9inode = V9FS_I(inode);
 120         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
 121
 122         memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
 123         inode->i_generation = st->st_gen;
 124         return 0;
 125 }
 126
 127 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
 128                                         struct p9_qid *qid,
 129                                         struct p9_fid *fid,
 130                                         struct p9_stat_dotl *st,
 131                                         int new)
 132 {
 133         int retval;
 134         unsigned long i_ino;
 135         struct inode *inode;
 136         struct v9fs_session_info *v9ses = sb->s_fs_info;
 137         int (*test)(struct inode *, void *);
 138
 139         if (new)
 140                 test = v9fs_test_new_inode_dotl;
 141         else
 142                 test = v9fs_test_inode_dotl;
 143
 144         i_ino = v9fs_qid2ino(qid);
 145         inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
 146         if (!inode)
 147                 return ERR_PTR(-ENOMEM);
 148         if (!(inode->i_state & I_NEW))
 149                 return inode;
 150         /*
 151          * initialize the inode with the stat info
 152          * FIXME!! we may need support for stale inodes
 153          * later.
 154          */
 155         inode->i_ino = i_ino;
 156         retval = v9fs_init_inode(v9ses, inode,
 157                                  st->st_mode, new_decode_dev(st->st_rdev));
 158         if (retval)
 159                 goto error;
 160
 161         v9fs_stat2inode_dotl(st, inode);
 162 #ifdef CONFIG_9P_FSCACHE
 163         v9fs_cache_inode_get_cookie(inode);
 164 #endif
 165         retval = v9fs_get_acl(inode, fid);
 166         if (retval)
 167                 goto error;
 168
 169         unlock_new_inode(inode);
 170         return inode;
 171 error:
 172         unlock_new_inode(inode);
 173         iput(inode);
 174         return ERR_PTR(retval);
 175
 176 }
 177
 178 struct inode *
 179 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 180                          struct super_block *sb, int new)
 181 {
 182         struct p9_stat_dotl *st;
 183         struct inode *inode = NULL;
 184
 185         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
 186         if (IS_ERR(st))
 187                 return ERR_CAST(st);
 188
 189         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
 190         kfree(st);
 191         return inode;
 192 }
 193
 194 /**
 195  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 196  * @dir: directory inode that is being created
 197  * @dentry:  dentry that is being deleted
 198  * @mode: create permissions
 199  * @nd: path information
 200  *
 201  */
 202
 203 static int
 204 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
 205                 struct nameidata *nd)
 206 {
 207         int err = 0;
 208         gid_t gid;
 209         int flags;
 210         umode_t mode;
 211         char *name = NULL;
 212         struct file *filp;
 213         struct p9_qid qid;
 214         struct inode *inode;
 215         struct p9_fid *fid = NULL;
 216         struct v9fs_inode *v9inode;
 217         struct p9_fid *dfid, *ofid, *inode_fid;
 218         struct v9fs_session_info *v9ses;
 219         struct posix_acl *pacl = NULL, *dacl = NULL;
 220
 221         v9ses = v9fs_inode2v9ses(dir);
 222         if (nd)
 223                 flags = nd->intent.open.flags;
 224         else {
 225                 /*
 226                  * create call without LOOKUP_OPEN is due
 227                  * to mknod of regular files. So use mknod
 228                  * operation.
 229                  */
 230                 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 231         }
 232
 233         name = (char *) dentry->d_name.name;
 234         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
 235                         "mode:0x%x\n", name, flags, omode);
 236
 237         dfid = v9fs_fid_lookup(dentry->d_parent);
 238         if (IS_ERR(dfid)) {
 239                 err = PTR_ERR(dfid);
 240                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 241                 return err;
 242         }
 243
 244         /* clone a fid to use for creation */
 245         ofid = p9_client_walk(dfid, 0, NULL, 1);
 246         if (IS_ERR(ofid)) {
 247                 err = PTR_ERR(ofid);
 248                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 249                 return err;
 250         }
 251
 252         gid = v9fs_get_fsgid_for_create(dir);
 253
 254         mode = omode;
 255         /* Update mode based on ACL value */
 256         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 257         if (err) {
 258                 P9_DPRINTK(P9_DEBUG_VFS,
 259                            "Failed to get acl values in creat %d\n", err);
 260                 goto error;
 261         }
 262         err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
 263         if (err < 0) {
 264                 P9_DPRINTK(P9_DEBUG_VFS,
 265                                 "p9_client_open_dotl failed in creat %d\n",
 266                                 err);
 267                 goto error;
 268         }
 269         v9fs_invalidate_inode_attr(dir);
 270
 271         /* instantiate inode and assign the unopened fid to the dentry */
 272         fid = p9_client_walk(dfid, 1, &name, 1);
 273         if (IS_ERR(fid)) {
 274                 err = PTR_ERR(fid);
 275                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 276                 fid = NULL;
 277                 goto error;
 278         }
 279         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 280         if (IS_ERR(inode)) {
 281                 err = PTR_ERR(inode);
 282                 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 283                 goto error;
 284         }
 285         err = v9fs_fid_add(dentry, fid);
 286         if (err < 0)
 287                 goto error;
 288         d_instantiate(dentry, inode);
 289
 290         /* Now set the ACL based on the default value */
 291         v9fs_set_create_acl(dentry, &dacl, &pacl);
 292
 293         v9inode = V9FS_I(inode);
 294         mutex_lock(&v9inode->v_mutex);
 295         if (v9ses->cache && !v9inode->writeback_fid &&
 296             ((flags & O_ACCMODE) != O_RDONLY)) {
 297                 /*
 298                  * clone a fid and add it to writeback_fid
 299                  * we do it during open time instead of
 300                  * page dirty time via write_begin/page_mkwrite
 301                  * because we want write after unlink usecase
 302                  * to work.
 303                  */
 304                 inode_fid = v9fs_writeback_fid(dentry);
 305                 if (IS_ERR(inode_fid)) {
 306                         err = PTR_ERR(inode_fid);
 307                         mutex_unlock(&v9inode->v_mutex);
 308                         goto err_clunk_old_fid;
 309                 }
 310                 v9inode->writeback_fid = (void *) inode_fid;
 311         }
 312         mutex_unlock(&v9inode->v_mutex);
 313         /* Since we are opening a file, assign the open fid to the file */
 314         filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
 315         if (IS_ERR(filp)) {
 316                 err = PTR_ERR(filp);
 317                 goto err_clunk_old_fid;
 318         }
 319         filp->private_data = ofid;
 320 #ifdef CONFIG_9P_FSCACHE
 321         if (v9ses->cache)
 322                 v9fs_cache_inode_set_cookie(inode, filp);
 323 #endif
 324         return 0;
 325
 326 error:
 327         if (fid)
 328                 p9_client_clunk(fid);
 329 err_clunk_old_fid:
 330         if (ofid)
 331                 p9_client_clunk(ofid);
 332         v9fs_set_create_acl(NULL, &dacl, &pacl);
 333         return err;
 334 }
 335
 336 /**
 337  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 338  * @dir:  inode that is being unlinked
 339  * @dentry: dentry that is being unlinked
 340  * @mode: mode for new directory
 341  *
 342  */
 343
 344 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 345                                struct dentry *dentry, int omode)
 346 {
 347         int err;
 348         struct v9fs_session_info *v9ses;
 349         struct p9_fid *fid = NULL, *dfid = NULL;
 350         gid_t gid;
 351         char *name;
 352         umode_t mode;
 353         struct inode *inode;
 354         struct p9_qid qid;
 355         struct dentry *dir_dentry;
 356         struct posix_acl *dacl = NULL, *pacl = NULL;
 357
 358         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 359         err = 0;
 360         v9ses = v9fs_inode2v9ses(dir);
 361
 362         omode |= S_IFDIR;
 363         if (dir->i_mode & S_ISGID)
 364                 omode |= S_ISGID;
 365
 366         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 367         dfid = v9fs_fid_lookup(dir_dentry);
 368         if (IS_ERR(dfid)) {
 369                 err = PTR_ERR(dfid);
 370                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 371                 dfid = NULL;
 372                 goto error;
 373         }
 374
 375         gid = v9fs_get_fsgid_for_create(dir);
 376         mode = omode;
 377         /* Update mode based on ACL value */
 378         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 379         if (err) {
 380                 P9_DPRINTK(P9_DEBUG_VFS,
 381                            "Failed to get acl values in mkdir %d\n", err);
 382                 goto error;
 383         }
 384         name = (char *) dentry->d_name.name;
 385         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 386         if (err < 0)
 387                 goto error;
 388
 389         /* instantiate inode and assign the unopened fid to the dentry */
 390         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 391                 fid = p9_client_walk(dfid, 1, &name, 1);
 392                 if (IS_ERR(fid)) {
 393                         err = PTR_ERR(fid);
 394                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 395                                 err);
 396                         fid = NULL;
 397                         goto error;
 398                 }
 399
 400                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 401                 if (IS_ERR(inode)) {
 402                         err = PTR_ERR(inode);
 403                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 404                                 err);
 405                         goto error;
 406                 }
 407                 err = v9fs_fid_add(dentry, fid);
 408                 if (err < 0)
 409                         goto error;
 410                 d_instantiate(dentry, inode);
 411                 fid = NULL;
 412         } else {
 413                 /*
 414                  * Not in cached mode. No need to populate
 415                  * inode with stat. We need to get an inode
 416                  * so that we can set the acl with dentry
 417                  */
 418                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 419                 if (IS_ERR(inode)) {
 420                         err = PTR_ERR(inode);
 421                         goto error;
 422                 }
 423                 d_instantiate(dentry, inode);
 424         }
 425         /* Now set the ACL based on the default value */
 426         v9fs_set_create_acl(dentry, &dacl, &pacl);
 427         inc_nlink(dir);
 428         v9fs_invalidate_inode_attr(dir);
 429 error:
 430         if (fid)
 431                 p9_client_clunk(fid);
 432         v9fs_set_create_acl(NULL, &dacl, &pacl);
 433         return err;
 434 }
 435
 436 static int
 437 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 438                  struct kstat *stat)
 439 {
 440         int err;
 441         struct v9fs_session_info *v9ses;
 442         struct p9_fid *fid;
 443         struct p9_stat_dotl *st;
 444
 445         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 446         err = -EPERM;
 447         v9ses = v9fs_dentry2v9ses(dentry);
 448         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 449                 generic_fillattr(dentry->d_inode, stat);
 450                 return 0;
 451         }
 452         fid = v9fs_fid_lookup(dentry);
 453         if (IS_ERR(fid))
 454                 return PTR_ERR(fid);
 455
 456         /* Ask for all the fields in stat structure. Server will return
 457          * whatever it supports
 458          */
 459
 460         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 461         if (IS_ERR(st))
 462                 return PTR_ERR(st);
 463
 464         v9fs_stat2inode_dotl(st, dentry->d_inode);
 465         generic_fillattr(dentry->d_inode, stat);
 466         /* Change block size to what the server returned */
 467         stat->blksize = st->st_blksize;
 468
 469         kfree(st);
 470         return 0;
 471 }
 472
 473 /**
 474  * v9fs_vfs_setattr_dotl - set file metadata
 475  * @dentry: file whose metadata to set
 476  * @iattr: metadata assignment structure
 477  *
 478  */
 479
 480 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 481 {
 482         int retval;
 483         struct v9fs_session_info *v9ses;
 484         struct p9_fid *fid;
 485         struct p9_iattr_dotl p9attr;
 486
 487         P9_DPRINTK(P9_DEBUG_VFS, "\n");
 488
 489         retval = inode_change_ok(dentry->d_inode, iattr);
 490         if (retval)
 491                 return retval;
 492
 493         p9attr.valid = iattr->ia_valid;
 494         p9attr.mode = iattr->ia_mode;
 495         p9attr.uid = iattr->ia_uid;
 496         p9attr.gid = iattr->ia_gid;
 497         p9attr.size = iattr->ia_size;
 498         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 499         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 500         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 501         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 502
 503         retval = -EPERM;
 504         v9ses = v9fs_dentry2v9ses(dentry);
 505         fid = v9fs_fid_lookup(dentry);
 506         if (IS_ERR(fid))
 507                 return PTR_ERR(fid);
 508
 509         /* Write all dirty data */
 510         if (S_ISREG(dentry->d_inode->i_mode))
 511                 filemap_write_and_wait(dentry->d_inode->i_mapping);
 512
 513         retval = p9_client_setattr(fid, &p9attr);
 514         if (retval < 0)
 515                 return retval;
 516
 517         if ((iattr->ia_valid & ATTR_SIZE) &&
 518             iattr->ia_size != i_size_read(dentry->d_inode))
 519                 truncate_setsize(dentry->d_inode, iattr->ia_size);
 520
 521         v9fs_invalidate_inode_attr(dentry->d_inode);
 522         setattr_copy(dentry->d_inode, iattr);
 523         mark_inode_dirty(dentry->d_inode);
 524         if (iattr->ia_valid & ATTR_MODE) {
 525                 /* We also want to update ACL when we update mode bits */
 526                 retval = v9fs_acl_chmod(dentry);
 527                 if (retval < 0)
 528                         return retval;
 529         }
 530         return 0;
 531 }
 532
 533 /**
 534  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 535  * @stat: stat structure
 536  * @inode: inode to populate
 537  * @sb: superblock of filesystem
 538  *
 539  */
 540
 541 void
 542 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 543 {
 544         mode_t mode;
 545         struct v9fs_inode *v9inode = V9FS_I(inode);
 546
 547         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 548                 inode->i_atime.tv_sec = stat->st_atime_sec;
 549                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 550                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 551                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 552                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 553                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 554                 inode->i_uid = stat->st_uid;
 555                 inode->i_gid = stat->st_gid;
 556                 inode->i_nlink = stat->st_nlink;
 557
 558                 mode = stat->st_mode & S_IALLUGO;
 559                 mode |= inode->i_mode & ~S_IALLUGO;
 560                 inode->i_mode = mode;
 561
 562                 i_size_write(inode, stat->st_size);
 563                 inode->i_blocks = stat->st_blocks;
 564         } else {
 565                 if (stat->st_result_mask & P9_STATS_ATIME) {
 566                         inode->i_atime.tv_sec = stat->st_atime_sec;
 567                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 568                 }
 569                 if (stat->st_result_mask & P9_STATS_MTIME) {
 570                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 571                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 572                 }
 573                 if (stat->st_result_mask & P9_STATS_CTIME) {
 574                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 575                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 576                 }
 577                 if (stat->st_result_mask & P9_STATS_UID)
 578                         inode->i_uid = stat->st_uid;
 579                 if (stat->st_result_mask & P9_STATS_GID)
 580                         inode->i_gid = stat->st_gid;
 581                 if (stat->st_result_mask & P9_STATS_NLINK)
 582                         inode->i_nlink = stat->st_nlink;
 583                 if (stat->st_result_mask & P9_STATS_MODE) {
 584                         inode->i_mode = stat->st_mode;
 585                         if ((S_ISBLK(inode->i_mode)) ||
 586                                                 (S_ISCHR(inode->i_mode)))
 587                                 init_special_inode(inode, inode->i_mode,
 588                                                                 inode->i_rdev);
 589                 }
 590                 if (stat->st_result_mask & P9_STATS_RDEV)
 591                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 592                 if (stat->st_result_mask & P9_STATS_SIZE)
 593                         i_size_write(inode, stat->st_size);
 594                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 595                         inode->i_blocks = stat->st_blocks;
 596         }
 597         if (stat->st_result_mask & P9_STATS_GEN)
 598                 inode->i_generation = stat->st_gen;
 599
 600         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 601          * because the inode structure does not have fields for them.
 602          */
 603         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 604 }
 605
 606 static int
 607 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 608                 const char *symname)
 609 {
 610         int err;
 611         gid_t gid;
 612         char *name;
 613         struct p9_qid qid;
 614         struct inode *inode;
 615         struct p9_fid *dfid;
 616         struct p9_fid *fid = NULL;
 617         struct v9fs_session_info *v9ses;
 618
 619         name = (char *) dentry->d_name.name;
 620         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
 621                         dir->i_ino, name, symname);
 622         v9ses = v9fs_inode2v9ses(dir);
 623
 624         dfid = v9fs_fid_lookup(dentry->d_parent);
 625         if (IS_ERR(dfid)) {
 626                 err = PTR_ERR(dfid);
 627                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 628                 return err;
 629         }
 630
 631         gid = v9fs_get_fsgid_for_create(dir);
 632
 633         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 634         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 635
 636         if (err < 0) {
 637                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 638                 goto error;
 639         }
 640
 641         v9fs_invalidate_inode_attr(dir);
 642         if (v9ses->cache) {
 643                 /* Now walk from the parent so we can get an unopened fid. */
 644                 fid = p9_client_walk(dfid, 1, &name, 1);
 645                 if (IS_ERR(fid)) {
 646                         err = PTR_ERR(fid);
 647                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 648                                         err);
 649                         fid = NULL;
 650                         goto error;
 651                 }
 652
 653                 /* instantiate inode and assign the unopened fid to dentry */
 654                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 655                 if (IS_ERR(inode)) {
 656                         err = PTR_ERR(inode);
 657                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 658                                         err);
 659                         goto error;
 660                 }
 661                 err = v9fs_fid_add(dentry, fid);
 662                 if (err < 0)
 663                         goto error;
 664                 d_instantiate(dentry, inode);
 665                 fid = NULL;
 666         } else {
 667                 /* Not in cached mode. No need to populate inode with stat */
 668                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 669                 if (IS_ERR(inode)) {
 670                         err = PTR_ERR(inode);
 671                         goto error;
 672                 }
 673                 d_instantiate(dentry, inode);
 674         }
 675
 676 error:
 677         if (fid)
 678                 p9_client_clunk(fid);
 679
 680         return err;
 681 }
 682
 683 /**
 684  * v9fs_vfs_link_dotl - create a hardlink for dotl
 685  * @old_dentry: dentry for file to link to
 686  * @dir: inode destination for new link
 687  * @dentry: dentry for link
 688  *
 689  */
 690
 691 static int
 692 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 693                 struct dentry *dentry)
 694 {
 695         int err;
 696         char *name;
 697         struct dentry *dir_dentry;
 698         struct p9_fid *dfid, *oldfid;
 699         struct v9fs_session_info *v9ses;
 700
 701         P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
 702                         dir->i_ino, old_dentry->d_name.name,
 703                         dentry->d_name.name);
 704
 705         v9ses = v9fs_inode2v9ses(dir);
 706         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 707         dfid = v9fs_fid_lookup(dir_dentry);
 708         if (IS_ERR(dfid))
 709                 return PTR_ERR(dfid);
 710
 711         oldfid = v9fs_fid_lookup(old_dentry);
 712         if (IS_ERR(oldfid))
 713                 return PTR_ERR(oldfid);
 714
 715         name = (char *) dentry->d_name.name;
 716
 717         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 718
 719         if (err < 0) {
 720                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 721                 return err;
 722         }
 723
 724         v9fs_invalidate_inode_attr(dir);
 725         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 726                 /* Get the latest stat info from server. */
 727                 struct p9_fid *fid;
 728                 fid = v9fs_fid_lookup(old_dentry);
 729                 if (IS_ERR(fid))
 730                         return PTR_ERR(fid);
 731
 732                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
 733         }
 734         ihold(old_dentry->d_inode);
 735         d_instantiate(dentry, old_dentry->d_inode);
 736
 737         return err;
 738 }
 739
 740 /**
 741  * v9fs_vfs_mknod_dotl - create a special file
 742  * @dir: inode destination for new link
 743  * @dentry: dentry for file
 744  * @mode: mode for creation
 745  * @rdev: device associated with special file
 746  *
 747  */
 748 static int
 749 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
 750                 dev_t rdev)
 751 {
 752         int err;
 753         gid_t gid;
 754         char *name;
 755         umode_t mode;
 756         struct v9fs_session_info *v9ses;
 757         struct p9_fid *fid = NULL, *dfid = NULL;
 758         struct inode *inode;
 759         struct p9_qid qid;
 760         struct dentry *dir_dentry;
 761         struct posix_acl *dacl = NULL, *pacl = NULL;
 762
 763         P9_DPRINTK(P9_DEBUG_VFS,
 764                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
 765                 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
 766
 767         if (!new_valid_dev(rdev))
 768                 return -EINVAL;
 769
 770         v9ses = v9fs_inode2v9ses(dir);
 771         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 772         dfid = v9fs_fid_lookup(dir_dentry);
 773         if (IS_ERR(dfid)) {
 774                 err = PTR_ERR(dfid);
 775                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 776                 dfid = NULL;
 777                 goto error;
 778         }
 779
 780         gid = v9fs_get_fsgid_for_create(dir);
 781         mode = omode;
 782         /* Update mode based on ACL value */
 783         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 784         if (err) {
 785                 P9_DPRINTK(P9_DEBUG_VFS,
 786                            "Failed to get acl values in mknod %d\n", err);
 787                 goto error;
 788         }
 789         name = (char *) dentry->d_name.name;
 790
 791         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 792         if (err < 0)
 793                 goto error;
 794
 795         v9fs_invalidate_inode_attr(dir);
 796         /* instantiate inode and assign the unopened fid to the dentry */
 797         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 798                 fid = p9_client_walk(dfid, 1, &name, 1);
 799                 if (IS_ERR(fid)) {
 800                         err = PTR_ERR(fid);
 801                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 802                                 err);
 803                         fid = NULL;
 804                         goto error;
 805                 }
 806
 807                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 808                 if (IS_ERR(inode)) {
 809                         err = PTR_ERR(inode);
 810                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 811                                 err);
 812                         goto error;
 813                 }
 814                 err = v9fs_fid_add(dentry, fid);
 815                 if (err < 0)
 816                         goto error;
 817                 d_instantiate(dentry, inode);
 818                 fid = NULL;
 819         } else {
 820                 /*
 821                  * Not in cached mode. No need to populate inode with stat.
 822                  * socket syscall returns a fd, so we need instantiate
 823                  */
 824                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 825                 if (IS_ERR(inode)) {
 826                         err = PTR_ERR(inode);
 827                         goto error;
 828                 }
 829                 d_instantiate(dentry, inode);
 830         }
 831         /* Now set the ACL based on the default value */
 832         v9fs_set_create_acl(dentry, &dacl, &pacl);
 833 error:
 834         if (fid)
 835                 p9_client_clunk(fid);
 836         v9fs_set_create_acl(NULL, &dacl, &pacl);
 837         return err;
 838 }
 839
 840 /**
 841  * v9fs_vfs_follow_link_dotl - follow a symlink path
 842  * @dentry: dentry for symlink
 843  * @nd: nameidata
 844  *
 845  */
 846
 847 static void *
 848 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
 849 {
 850         int retval;
 851         struct p9_fid *fid;
 852         char *link = __getname();
 853         char *target;
 854
 855         P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
 856
 857         if (!link) {
 858                 link = ERR_PTR(-ENOMEM);
 859                 goto ndset;
 860         }
 861         fid = v9fs_fid_lookup(dentry);
 862         if (IS_ERR(fid)) {
 863                 __putname(link);
 864                 link = ERR_CAST(fid);
 865                 goto ndset;
 866         }
 867         retval = p9_client_readlink(fid, &target);
 868         if (!retval) {
 869                 strcpy(link, target);
 870                 kfree(target);
 871                 goto ndset;
 872         }
 873         __putname(link);
 874         link = ERR_PTR(retval);
 875 ndset:
 876         nd_set_link(nd, link);
 877         return NULL;
 878 }
 879
 880 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 881 {
 882         loff_t i_size;
 883         struct p9_stat_dotl *st;
 884         struct v9fs_session_info *v9ses;
 885
 886         v9ses = v9fs_inode2v9ses(inode);
 887         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 888         if (IS_ERR(st))
 889                 return PTR_ERR(st);
 890         /*
 891          * Don't update inode if the file type is different
 892          */
 893         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 894                 goto out;
 895
 896         spin_lock(&inode->i_lock);
 897         /*
 898          * We don't want to refresh inode->i_size,
 899          * because we may have cached data
 900          */
 901         i_size = inode->i_size;
 902         v9fs_stat2inode_dotl(st, inode);
 903         if (v9ses->cache)
 904                 inode->i_size = i_size;
 905         spin_unlock(&inode->i_lock);
 906 out:
 907         kfree(st);
 908         return 0;
 909 }
 910
 911 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 912         .create = v9fs_vfs_create_dotl,
 913         .lookup = v9fs_vfs_lookup,
 914         .link = v9fs_vfs_link_dotl,
 915         .symlink = v9fs_vfs_symlink_dotl,
 916         .unlink = v9fs_vfs_unlink,
 917         .mkdir = v9fs_vfs_mkdir_dotl,
 918         .rmdir = v9fs_vfs_rmdir,
 919         .mknod = v9fs_vfs_mknod_dotl,
 920         .rename = v9fs_vfs_rename,
 921         .getattr = v9fs_vfs_getattr_dotl,
 922         .setattr = v9fs_vfs_setattr_dotl,
 923         .setxattr = generic_setxattr,
 924         .getxattr = generic_getxattr,
 925         .removexattr = generic_removexattr,
 926         .listxattr = v9fs_listxattr,
 927         .get_acl = v9fs_iop_get_acl,
 928 };
 929
 930 const struct inode_operations v9fs_file_inode_operations_dotl = {
 931         .getattr = v9fs_vfs_getattr_dotl,
 932         .setattr = v9fs_vfs_setattr_dotl,
 933         .setxattr = generic_setxattr,
 934         .getxattr = generic_getxattr,
 935         .removexattr = generic_removexattr,
 936         .listxattr = v9fs_listxattr,
 937         .get_acl = v9fs_iop_get_acl,
 938 };
 939
 940 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 941         .readlink = generic_readlink,
 942         .follow_link = v9fs_vfs_follow_link_dotl,
 943         .put_link = v9fs_vfs_put_link,
 944         .getattr = v9fs_vfs_getattr_dotl,
 945         .setattr = v9fs_vfs_setattr_dotl,
 946         .setxattr = generic_setxattr,
 947         .getxattr = generic_getxattr,
 948         .removexattr = generic_removexattr,
 949         .listxattr = v9fs_listxattr,
 950 };