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, umode_t 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 kgid_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 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
  72 {
  73         struct v9fs_inode *v9inode = V9FS_I(inode);
  74         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
  75
  76         /* don't match inode of different type */
  77         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
  78                 return 0;
  79
  80         if (inode->i_generation != st->st_gen)
  81                 return 0;
  82
  83         /* compare qid details */
  84         if (memcmp(&v9inode->qid.version,
  85                    &st->qid.version, sizeof(v9inode->qid.version)))
  86                 return 0;
  87
  88         if (v9inode->qid.type != st->qid.type)
  89                 return 0;
  90         return 1;
  91 }
  92
  93 /* Always get a new inode */
  94 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
  95 {
  96         return 0;
  97 }
  98
  99 static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
 100 {
 101         struct v9fs_inode *v9inode = V9FS_I(inode);
 102         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
 103
 104         memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
 105         inode->i_generation = st->st_gen;
 106         return 0;
 107 }
 108
 109 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
 110                                         struct p9_qid *qid,
 111                                         struct p9_fid *fid,
 112                                         struct p9_stat_dotl *st,
 113                                         int new)
 114 {
 115         int retval;
 116         unsigned long i_ino;
 117         struct inode *inode;
 118         struct v9fs_session_info *v9ses = sb->s_fs_info;
 119         int (*test)(struct inode *, void *);
 120
 121         if (new)
 122                 test = v9fs_test_new_inode_dotl;
 123         else
 124                 test = v9fs_test_inode_dotl;
 125
 126         i_ino = v9fs_qid2ino(qid);
 127         inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
 128         if (!inode)
 129                 return ERR_PTR(-ENOMEM);
 130         if (!(inode->i_state & I_NEW))
 131                 return inode;
 132         /*
 133          * initialize the inode with the stat info
 134          * FIXME!! we may need support for stale inodes
 135          * later.
 136          */
 137         inode->i_ino = i_ino;
 138         retval = v9fs_init_inode(v9ses, inode,
 139                                  st->st_mode, new_decode_dev(st->st_rdev));
 140         if (retval)
 141                 goto error;
 142
 143         v9fs_stat2inode_dotl(st, inode);
 144         v9fs_cache_inode_get_cookie(inode);
 145         retval = v9fs_get_acl(inode, fid);
 146         if (retval)
 147                 goto error;
 148
 149         unlock_new_inode(inode);
 150         return inode;
 151 error:
 152         iget_failed(inode);
 153         return ERR_PTR(retval);
 154
 155 }
 156
 157 struct inode *
 158 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 159                          struct super_block *sb, int new)
 160 {
 161         struct p9_stat_dotl *st;
 162         struct inode *inode = NULL;
 163
 164         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
 165         if (IS_ERR(st))
 166                 return ERR_CAST(st);
 167
 168         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
 169         kfree(st);
 170         return inode;
 171 }
 172
 173 struct dotl_openflag_map {
 174         int open_flag;
 175         int dotl_flag;
 176 };
 177
 178 static int v9fs_mapped_dotl_flags(int flags)
 179 {
 180         int i;
 181         int rflags = 0;
 182         struct dotl_openflag_map dotl_oflag_map[] = {
 183                 { O_CREAT,      P9_DOTL_CREATE },
 184                 { O_EXCL,       P9_DOTL_EXCL },
 185                 { O_NOCTTY,     P9_DOTL_NOCTTY },
 186                 { O_APPEND,     P9_DOTL_APPEND },
 187                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
 188                 { O_DSYNC,      P9_DOTL_DSYNC },
 189                 { FASYNC,       P9_DOTL_FASYNC },
 190                 { O_DIRECT,     P9_DOTL_DIRECT },
 191                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
 192                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
 193                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
 194                 { O_NOATIME,    P9_DOTL_NOATIME },
 195                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
 196                 { O_SYNC,       P9_DOTL_SYNC},
 197         };
 198         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
 199                 if (flags & dotl_oflag_map[i].open_flag)
 200                         rflags |= dotl_oflag_map[i].dotl_flag;
 201         }
 202         return rflags;
 203 }
 204
 205 /**
 206  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 207  * plan 9 open flag.
 208  * @flags: flags to convert
 209  */
 210 int v9fs_open_to_dotl_flags(int flags)
 211 {
 212         int rflags = 0;
 213
 214         /*
 215          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
 216          * and P9_DOTL_NOACCESS
 217          */
 218         rflags |= flags & O_ACCMODE;
 219         rflags |= v9fs_mapped_dotl_flags(flags);
 220
 221         return rflags;
 222 }
 223
 224 /**
 225  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 226  * @dir: directory inode that is being created
 227  * @dentry:  dentry that is being deleted
 228  * @omode: create permissions
 229  *
 230  */
 231
 232 static int
 233 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 234                 bool excl)
 235 {
 236         return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 237 }
 238
 239 static int
 240 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 241                           struct file *file, unsigned flags, umode_t omode,
 242                           int *opened)
 243 {
 244         int err = 0;
 245         kgid_t gid;
 246         umode_t mode;
 247         const unsigned char *name = NULL;
 248         struct p9_qid qid;
 249         struct inode *inode;
 250         struct p9_fid *fid = NULL;
 251         struct v9fs_inode *v9inode;
 252         struct p9_fid *dfid, *ofid, *inode_fid;
 253         struct v9fs_session_info *v9ses;
 254         struct posix_acl *pacl = NULL, *dacl = NULL;
 255         struct dentry *res = NULL;
 256
 257         if (d_in_lookup(dentry)) {
 258                 res = v9fs_vfs_lookup(dir, dentry, 0);
 259                 if (IS_ERR(res))
 260                         return PTR_ERR(res);
 261
 262                 if (res)
 263                         dentry = res;
 264         }
 265
 266         /* Only creates */
 267         if (!(flags & O_CREAT) || d_really_is_positive(dentry))
 268                 return  finish_no_open(file, res);
 269
 270         v9ses = v9fs_inode2v9ses(dir);
 271
 272         name = dentry->d_name.name;
 273         p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
 274                  name, flags, omode);
 275
 276         dfid = v9fs_parent_fid(dentry);
 277         if (IS_ERR(dfid)) {
 278                 err = PTR_ERR(dfid);
 279                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 280                 goto out;
 281         }
 282
 283         /* clone a fid to use for creation */
 284         ofid = clone_fid(dfid);
 285         if (IS_ERR(ofid)) {
 286                 err = PTR_ERR(ofid);
 287                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 288                 goto out;
 289         }
 290
 291         gid = v9fs_get_fsgid_for_create(dir);
 292
 293         mode = omode;
 294         /* Update mode based on ACL value */
 295         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 296         if (err) {
 297                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
 298                          err);
 299                 goto error;
 300         }
 301         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
 302                                     mode, gid, &qid);
 303         if (err < 0) {
 304                 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
 305                          err);
 306                 goto error;
 307         }
 308         v9fs_invalidate_inode_attr(dir);
 309
 310         /* instantiate inode and assign the unopened fid to the dentry */
 311         fid = p9_client_walk(dfid, 1, &name, 1);
 312         if (IS_ERR(fid)) {
 313                 err = PTR_ERR(fid);
 314                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 315                 fid = NULL;
 316                 goto error;
 317         }
 318         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 319         if (IS_ERR(inode)) {
 320                 err = PTR_ERR(inode);
 321                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 322                 goto error;
 323         }
 324         /* Now set the ACL based on the default value */
 325         v9fs_set_create_acl(inode, fid, dacl, pacl);
 326
 327         v9fs_fid_add(dentry, fid);
 328         d_instantiate(dentry, inode);
 329
 330         v9inode = V9FS_I(inode);
 331         mutex_lock(&v9inode->v_mutex);
 332         if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
 333             !v9inode->writeback_fid &&
 334             ((flags & O_ACCMODE) != O_RDONLY)) {
 335                 /*
 336                  * clone a fid and add it to writeback_fid
 337                  * we do it during open time instead of
 338                  * page dirty time via write_begin/page_mkwrite
 339                  * because we want write after unlink usecase
 340                  * to work.
 341                  */
 342                 inode_fid = v9fs_writeback_fid(dentry);
 343                 if (IS_ERR(inode_fid)) {
 344                         err = PTR_ERR(inode_fid);
 345                         mutex_unlock(&v9inode->v_mutex);
 346                         goto err_clunk_old_fid;
 347                 }
 348                 v9inode->writeback_fid = (void *) inode_fid;
 349         }
 350         mutex_unlock(&v9inode->v_mutex);
 351         /* Since we are opening a file, assign the open fid to the file */
 352         err = finish_open(file, dentry, generic_file_open, opened);
 353         if (err)
 354                 goto err_clunk_old_fid;
 355         file->private_data = ofid;
 356         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
 357                 v9fs_cache_inode_set_cookie(inode, file);
 358         *opened |= FILE_CREATED;
 359 out:
 360         v9fs_put_acl(dacl, pacl);
 361         dput(res);
 362         return err;
 363
 364 error:
 365         if (fid)
 366                 p9_client_clunk(fid);
 367 err_clunk_old_fid:
 368         if (ofid)
 369                 p9_client_clunk(ofid);
 370         goto out;
 371 }
 372
 373 /**
 374  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 375  * @dir:  inode that is being unlinked
 376  * @dentry: dentry that is being unlinked
 377  * @omode: mode for new directory
 378  *
 379  */
 380
 381 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 382                                struct dentry *dentry, umode_t omode)
 383 {
 384         int err;
 385         struct v9fs_session_info *v9ses;
 386         struct p9_fid *fid = NULL, *dfid = NULL;
 387         kgid_t gid;
 388         const unsigned char *name;
 389         umode_t mode;
 390         struct inode *inode;
 391         struct p9_qid qid;
 392         struct posix_acl *dacl = NULL, *pacl = NULL;
 393
 394         p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
 395         err = 0;
 396         v9ses = v9fs_inode2v9ses(dir);
 397
 398         omode |= S_IFDIR;
 399         if (dir->i_mode & S_ISGID)
 400                 omode |= S_ISGID;
 401
 402         dfid = v9fs_parent_fid(dentry);
 403         if (IS_ERR(dfid)) {
 404                 err = PTR_ERR(dfid);
 405                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 406                 dfid = NULL;
 407                 goto error;
 408         }
 409
 410         gid = v9fs_get_fsgid_for_create(dir);
 411         mode = omode;
 412         /* Update mode based on ACL value */
 413         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 414         if (err) {
 415                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 416                          err);
 417                 goto error;
 418         }
 419         name = dentry->d_name.name;
 420         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 421         if (err < 0)
 422                 goto error;
 423
 424         fid = p9_client_walk(dfid, 1, &name, 1);
 425         if (IS_ERR(fid)) {
 426                 err = PTR_ERR(fid);
 427                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 428                          err);
 429                 fid = NULL;
 430                 goto error;
 431         }
 432
 433         /* instantiate inode and assign the unopened fid to the dentry */
 434         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 435                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 436                 if (IS_ERR(inode)) {
 437                         err = PTR_ERR(inode);
 438                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 439                                  err);
 440                         goto error;
 441                 }
 442                 v9fs_fid_add(dentry, fid);
 443                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 444                 d_instantiate(dentry, inode);
 445                 fid = NULL;
 446                 err = 0;
 447         } else {
 448                 /*
 449                  * Not in cached mode. No need to populate
 450                  * inode with stat. We need to get an inode
 451                  * so that we can set the acl with dentry
 452                  */
 453                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 454                 if (IS_ERR(inode)) {
 455                         err = PTR_ERR(inode);
 456                         goto error;
 457                 }
 458                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 459                 d_instantiate(dentry, inode);
 460         }
 461         inc_nlink(dir);
 462         v9fs_invalidate_inode_attr(dir);
 463 error:
 464         if (fid)
 465                 p9_client_clunk(fid);
 466         v9fs_put_acl(dacl, pacl);
 467         return err;
 468 }
 469
 470 static int
 471 v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
 472                  u32 request_mask, unsigned int flags)
 473 {
 474         struct dentry *dentry = path->dentry;
 475         struct v9fs_session_info *v9ses;
 476         struct p9_fid *fid;
 477         struct p9_stat_dotl *st;
 478
 479         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 480         v9ses = v9fs_dentry2v9ses(dentry);
 481         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 482                 generic_fillattr(d_inode(dentry), stat);
 483                 return 0;
 484         }
 485         fid = v9fs_fid_lookup(dentry);
 486         if (IS_ERR(fid))
 487                 return PTR_ERR(fid);
 488
 489         /* Ask for all the fields in stat structure. Server will return
 490          * whatever it supports
 491          */
 492
 493         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 494         if (IS_ERR(st))
 495                 return PTR_ERR(st);
 496
 497         v9fs_stat2inode_dotl(st, d_inode(dentry));
 498         generic_fillattr(d_inode(dentry), stat);
 499         /* Change block size to what the server returned */
 500         stat->blksize = st->st_blksize;
 501
 502         kfree(st);
 503         return 0;
 504 }
 505
 506 /*
 507  * Attribute flags.
 508  */
 509 #define P9_ATTR_MODE            (1 << 0)
 510 #define P9_ATTR_UID             (1 << 1)
 511 #define P9_ATTR_GID             (1 << 2)
 512 #define P9_ATTR_SIZE            (1 << 3)
 513 #define P9_ATTR_ATIME           (1 << 4)
 514 #define P9_ATTR_MTIME           (1 << 5)
 515 #define P9_ATTR_CTIME           (1 << 6)
 516 #define P9_ATTR_ATIME_SET       (1 << 7)
 517 #define P9_ATTR_MTIME_SET       (1 << 8)
 518
 519 struct dotl_iattr_map {
 520         int iattr_valid;
 521         int p9_iattr_valid;
 522 };
 523
 524 static int v9fs_mapped_iattr_valid(int iattr_valid)
 525 {
 526         int i;
 527         int p9_iattr_valid = 0;
 528         struct dotl_iattr_map dotl_iattr_map[] = {
 529                 { ATTR_MODE,            P9_ATTR_MODE },
 530                 { ATTR_UID,             P9_ATTR_UID },
 531                 { ATTR_GID,             P9_ATTR_GID },
 532                 { ATTR_SIZE,            P9_ATTR_SIZE },
 533                 { ATTR_ATIME,           P9_ATTR_ATIME },
 534                 { ATTR_MTIME,           P9_ATTR_MTIME },
 535                 { ATTR_CTIME,           P9_ATTR_CTIME },
 536                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 537                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 538         };
 539         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 540                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 541                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 542         }
 543         return p9_iattr_valid;
 544 }
 545
 546 /**
 547  * v9fs_vfs_setattr_dotl - set file metadata
 548  * @dentry: file whose metadata to set
 549  * @iattr: metadata assignment structure
 550  *
 551  */
 552
 553 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 554 {
 555         int retval;
 556         struct p9_fid *fid;
 557         struct p9_iattr_dotl p9attr;
 558         struct inode *inode = d_inode(dentry);
 559
 560         p9_debug(P9_DEBUG_VFS, "\n");
 561
 562         retval = setattr_prepare(dentry, iattr);
 563         if (retval)
 564                 return retval;
 565
 566         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 567         p9attr.mode = iattr->ia_mode;
 568         p9attr.uid = iattr->ia_uid;
 569         p9attr.gid = iattr->ia_gid;
 570         p9attr.size = iattr->ia_size;
 571         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 572         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 573         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 574         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 575
 576         fid = v9fs_fid_lookup(dentry);
 577         if (IS_ERR(fid))
 578                 return PTR_ERR(fid);
 579
 580         /* Write all dirty data */
 581         if (S_ISREG(inode->i_mode))
 582                 filemap_write_and_wait(inode->i_mapping);
 583
 584         retval = p9_client_setattr(fid, &p9attr);
 585         if (retval < 0)
 586                 return retval;
 587
 588         if ((iattr->ia_valid & ATTR_SIZE) &&
 589             iattr->ia_size != i_size_read(inode))
 590                 truncate_setsize(inode, iattr->ia_size);
 591
 592         v9fs_invalidate_inode_attr(inode);
 593         setattr_copy(inode, iattr);
 594         mark_inode_dirty(inode);
 595         if (iattr->ia_valid & ATTR_MODE) {
 596                 /* We also want to update ACL when we update mode bits */
 597                 retval = v9fs_acl_chmod(inode, fid);
 598                 if (retval < 0)
 599                         return retval;
 600         }
 601         return 0;
 602 }
 603
 604 /**
 605  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 606  * @stat: stat structure
 607  * @inode: inode to populate
 608  *
 609  */
 610
 611 void
 612 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 613 {
 614         umode_t mode;
 615         struct v9fs_inode *v9inode = V9FS_I(inode);
 616
 617         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 618                 inode->i_atime.tv_sec = stat->st_atime_sec;
 619                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 620                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 621                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 622                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 623                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 624                 inode->i_uid = stat->st_uid;
 625                 inode->i_gid = stat->st_gid;
 626                 set_nlink(inode, stat->st_nlink);
 627
 628                 mode = stat->st_mode & S_IALLUGO;
 629                 mode |= inode->i_mode & ~S_IALLUGO;
 630                 inode->i_mode = mode;
 631
 632                 i_size_write(inode, stat->st_size);
 633                 inode->i_blocks = stat->st_blocks;
 634         } else {
 635                 if (stat->st_result_mask & P9_STATS_ATIME) {
 636                         inode->i_atime.tv_sec = stat->st_atime_sec;
 637                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 638                 }
 639                 if (stat->st_result_mask & P9_STATS_MTIME) {
 640                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 641                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 642                 }
 643                 if (stat->st_result_mask & P9_STATS_CTIME) {
 644                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 645                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 646                 }
 647                 if (stat->st_result_mask & P9_STATS_UID)
 648                         inode->i_uid = stat->st_uid;
 649                 if (stat->st_result_mask & P9_STATS_GID)
 650                         inode->i_gid = stat->st_gid;
 651                 if (stat->st_result_mask & P9_STATS_NLINK)
 652                         set_nlink(inode, stat->st_nlink);
 653                 if (stat->st_result_mask & P9_STATS_MODE) {
 654                         inode->i_mode = stat->st_mode;
 655                         if ((S_ISBLK(inode->i_mode)) ||
 656                                                 (S_ISCHR(inode->i_mode)))
 657                                 init_special_inode(inode, inode->i_mode,
 658                                                                 inode->i_rdev);
 659                 }
 660                 if (stat->st_result_mask & P9_STATS_RDEV)
 661                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 662                 if (stat->st_result_mask & P9_STATS_SIZE)
 663                         i_size_write(inode, stat->st_size);
 664                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 665                         inode->i_blocks = stat->st_blocks;
 666         }
 667         if (stat->st_result_mask & P9_STATS_GEN)
 668                 inode->i_generation = stat->st_gen;
 669
 670         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 671          * because the inode structure does not have fields for them.
 672          */
 673         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 674 }
 675
 676 static int
 677 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 678                 const char *symname)
 679 {
 680         int err;
 681         kgid_t gid;
 682         const unsigned char *name;
 683         struct p9_qid qid;
 684         struct inode *inode;
 685         struct p9_fid *dfid;
 686         struct p9_fid *fid = NULL;
 687         struct v9fs_session_info *v9ses;
 688
 689         name = dentry->d_name.name;
 690         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 691         v9ses = v9fs_inode2v9ses(dir);
 692
 693         dfid = v9fs_parent_fid(dentry);
 694         if (IS_ERR(dfid)) {
 695                 err = PTR_ERR(dfid);
 696                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 697                 return err;
 698         }
 699
 700         gid = v9fs_get_fsgid_for_create(dir);
 701
 702         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 703         err = p9_client_symlink(dfid, name, symname, gid, &qid);
 704
 705         if (err < 0) {
 706                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 707                 goto error;
 708         }
 709
 710         v9fs_invalidate_inode_attr(dir);
 711         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 712                 /* Now walk from the parent so we can get an unopened fid. */
 713                 fid = p9_client_walk(dfid, 1, &name, 1);
 714                 if (IS_ERR(fid)) {
 715                         err = PTR_ERR(fid);
 716                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 717                                  err);
 718                         fid = NULL;
 719                         goto error;
 720                 }
 721
 722                 /* instantiate inode and assign the unopened fid to dentry */
 723                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 724                 if (IS_ERR(inode)) {
 725                         err = PTR_ERR(inode);
 726                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 727                                  err);
 728                         goto error;
 729                 }
 730                 v9fs_fid_add(dentry, fid);
 731                 d_instantiate(dentry, inode);
 732                 fid = NULL;
 733                 err = 0;
 734         } else {
 735                 /* Not in cached mode. No need to populate inode with stat */
 736                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 737                 if (IS_ERR(inode)) {
 738                         err = PTR_ERR(inode);
 739                         goto error;
 740                 }
 741                 d_instantiate(dentry, inode);
 742         }
 743
 744 error:
 745         if (fid)
 746                 p9_client_clunk(fid);
 747
 748         return err;
 749 }
 750
 751 /**
 752  * v9fs_vfs_link_dotl - create a hardlink for dotl
 753  * @old_dentry: dentry for file to link to
 754  * @dir: inode destination for new link
 755  * @dentry: dentry for link
 756  *
 757  */
 758
 759 static int
 760 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 761                 struct dentry *dentry)
 762 {
 763         int err;
 764         struct p9_fid *dfid, *oldfid;
 765         struct v9fs_session_info *v9ses;
 766
 767         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
 768                  dir->i_ino, old_dentry, dentry);
 769
 770         v9ses = v9fs_inode2v9ses(dir);
 771         dfid = v9fs_parent_fid(dentry);
 772         if (IS_ERR(dfid))
 773                 return PTR_ERR(dfid);
 774
 775         oldfid = v9fs_fid_lookup(old_dentry);
 776         if (IS_ERR(oldfid))
 777                 return PTR_ERR(oldfid);
 778
 779         err = p9_client_link(dfid, oldfid, dentry->d_name.name);
 780
 781         if (err < 0) {
 782                 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 783                 return err;
 784         }
 785
 786         v9fs_invalidate_inode_attr(dir);
 787         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 788                 /* Get the latest stat info from server. */
 789                 struct p9_fid *fid;
 790                 fid = v9fs_fid_lookup(old_dentry);
 791                 if (IS_ERR(fid))
 792                         return PTR_ERR(fid);
 793
 794                 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
 795         }
 796         ihold(d_inode(old_dentry));
 797         d_instantiate(dentry, d_inode(old_dentry));
 798
 799         return err;
 800 }
 801
 802 /**
 803  * v9fs_vfs_mknod_dotl - create a special file
 804  * @dir: inode destination for new link
 805  * @dentry: dentry for file
 806  * @omode: mode for creation
 807  * @rdev: device associated with special file
 808  *
 809  */
 810 static int
 811 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 812                 dev_t rdev)
 813 {
 814         int err;
 815         kgid_t gid;
 816         const unsigned char *name;
 817         umode_t mode;
 818         struct v9fs_session_info *v9ses;
 819         struct p9_fid *fid = NULL, *dfid = NULL;
 820         struct inode *inode;
 821         struct p9_qid qid;
 822         struct posix_acl *dacl = NULL, *pacl = NULL;
 823
 824         p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
 825                  dir->i_ino, dentry, omode,
 826                  MAJOR(rdev), MINOR(rdev));
 827
 828         v9ses = v9fs_inode2v9ses(dir);
 829         dfid = v9fs_parent_fid(dentry);
 830         if (IS_ERR(dfid)) {
 831                 err = PTR_ERR(dfid);
 832                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 833                 dfid = NULL;
 834                 goto error;
 835         }
 836
 837         gid = v9fs_get_fsgid_for_create(dir);
 838         mode = omode;
 839         /* Update mode based on ACL value */
 840         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 841         if (err) {
 842                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 843                          err);
 844                 goto error;
 845         }
 846         name = dentry->d_name.name;
 847
 848         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 849         if (err < 0)
 850                 goto error;
 851
 852         v9fs_invalidate_inode_attr(dir);
 853         fid = p9_client_walk(dfid, 1, &name, 1);
 854         if (IS_ERR(fid)) {
 855                 err = PTR_ERR(fid);
 856                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 857                          err);
 858                 fid = NULL;
 859                 goto error;
 860         }
 861
 862         /* instantiate inode and assign the unopened fid to the dentry */
 863         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 864                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 865                 if (IS_ERR(inode)) {
 866                         err = PTR_ERR(inode);
 867                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 868                                  err);
 869                         goto error;
 870                 }
 871                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 872                 v9fs_fid_add(dentry, fid);
 873                 d_instantiate(dentry, inode);
 874                 fid = NULL;
 875                 err = 0;
 876         } else {
 877                 /*
 878                  * Not in cached mode. No need to populate inode with stat.
 879                  * socket syscall returns a fd, so we need instantiate
 880                  */
 881                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 882                 if (IS_ERR(inode)) {
 883                         err = PTR_ERR(inode);
 884                         goto error;
 885                 }
 886                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 887                 d_instantiate(dentry, inode);
 888         }
 889 error:
 890         if (fid)
 891                 p9_client_clunk(fid);
 892         v9fs_put_acl(dacl, pacl);
 893         return err;
 894 }
 895
 896 /**
 897  * v9fs_vfs_get_link_dotl - follow a symlink path
 898  * @dentry: dentry for symlink
 899  * @inode: inode for symlink
 900  * @done: destructor for return value
 901  */
 902
 903 static const char *
 904 v9fs_vfs_get_link_dotl(struct dentry *dentry,
 905                        struct inode *inode,
 906                        struct delayed_call *done)
 907 {
 908         struct p9_fid *fid;
 909         char *target;
 910         int retval;
 911
 912         if (!dentry)
 913                 return ERR_PTR(-ECHILD);
 914
 915         p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
 916
 917         fid = v9fs_fid_lookup(dentry);
 918         if (IS_ERR(fid))
 919                 return ERR_CAST(fid);
 920         retval = p9_client_readlink(fid, &target);
 921         if (retval)
 922                 return ERR_PTR(retval);
 923         set_delayed_call(done, kfree_link, target);
 924         return target;
 925 }
 926
 927 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 928 {
 929         loff_t i_size;
 930         struct p9_stat_dotl *st;
 931         struct v9fs_session_info *v9ses;
 932
 933         v9ses = v9fs_inode2v9ses(inode);
 934         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 935         if (IS_ERR(st))
 936                 return PTR_ERR(st);
 937         /*
 938          * Don't update inode if the file type is different
 939          */
 940         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 941                 goto out;
 942
 943         spin_lock(&inode->i_lock);
 944         /*
 945          * We don't want to refresh inode->i_size,
 946          * because we may have cached data
 947          */
 948         i_size = inode->i_size;
 949         v9fs_stat2inode_dotl(st, inode);
 950         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
 951                 inode->i_size = i_size;
 952         spin_unlock(&inode->i_lock);
 953 out:
 954         kfree(st);
 955         return 0;
 956 }
 957
 958 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 959         .create = v9fs_vfs_create_dotl,
 960         .atomic_open = v9fs_vfs_atomic_open_dotl,
 961         .lookup = v9fs_vfs_lookup,
 962         .link = v9fs_vfs_link_dotl,
 963         .symlink = v9fs_vfs_symlink_dotl,
 964         .unlink = v9fs_vfs_unlink,
 965         .mkdir = v9fs_vfs_mkdir_dotl,
 966         .rmdir = v9fs_vfs_rmdir,
 967         .mknod = v9fs_vfs_mknod_dotl,
 968         .rename = v9fs_vfs_rename,
 969         .getattr = v9fs_vfs_getattr_dotl,
 970         .setattr = v9fs_vfs_setattr_dotl,
 971         .listxattr = v9fs_listxattr,
 972         .get_acl = v9fs_iop_get_acl,
 973 };
 974
 975 const struct inode_operations v9fs_file_inode_operations_dotl = {
 976         .getattr = v9fs_vfs_getattr_dotl,
 977         .setattr = v9fs_vfs_setattr_dotl,
 978         .listxattr = v9fs_listxattr,
 979         .get_acl = v9fs_iop_get_acl,
 980 };
 981
 982 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 983         .get_link = v9fs_vfs_get_link_dotl,
 984         .getattr = v9fs_vfs_getattr_dotl,
 985         .setattr = v9fs_vfs_setattr_dotl,
 986         .listxattr = v9fs_listxattr,
 987 };