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