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