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