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 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 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 #ifdef CONFIG_9P_FSCACHE
 145         v9fs_cache_inode_get_cookie(inode);
 146 #endif
 147         retval = v9fs_get_acl(inode, fid);
 148         if (retval)
 149                 goto error;
 150
 151         unlock_new_inode(inode);
 152         return inode;
 153 error:
 154         unlock_new_inode(inode);
 155         iput(inode);
 156         return ERR_PTR(retval);
 157
 158 }
 159
 160 struct inode *
 161 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 162                          struct super_block *sb, int new)
 163 {
 164         struct p9_stat_dotl *st;
 165         struct inode *inode = NULL;
 166
 167         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
 168         if (IS_ERR(st))
 169                 return ERR_CAST(st);
 170
 171         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
 172         kfree(st);
 173         return inode;
 174 }
 175
 176 struct dotl_openflag_map {
 177         int open_flag;
 178         int dotl_flag;
 179 };
 180
 181 static int v9fs_mapped_dotl_flags(int flags)
 182 {
 183         int i;
 184         int rflags = 0;
 185         struct dotl_openflag_map dotl_oflag_map[] = {
 186                 { O_CREAT,      P9_DOTL_CREATE },
 187                 { O_EXCL,       P9_DOTL_EXCL },
 188                 { O_NOCTTY,     P9_DOTL_NOCTTY },
 189                 { O_TRUNC,      P9_DOTL_TRUNC },
 190                 { O_APPEND,     P9_DOTL_APPEND },
 191                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
 192                 { O_DSYNC,      P9_DOTL_DSYNC },
 193                 { FASYNC,       P9_DOTL_FASYNC },
 194                 { O_DIRECT,     P9_DOTL_DIRECT },
 195                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
 196                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
 197                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
 198                 { O_NOATIME,    P9_DOTL_NOATIME },
 199                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
 200                 { O_SYNC,       P9_DOTL_SYNC},
 201         };
 202         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
 203                 if (flags & dotl_oflag_map[i].open_flag)
 204                         rflags |= dotl_oflag_map[i].dotl_flag;
 205         }
 206         return rflags;
 207 }
 208
 209 /**
 210  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 211  * plan 9 open flag.
 212  * @flags: flags to convert
 213  */
 214 int v9fs_open_to_dotl_flags(int flags)
 215 {
 216         int rflags = 0;
 217
 218         /*
 219          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
 220          * and P9_DOTL_NOACCESS
 221          */
 222         rflags |= flags & O_ACCMODE;
 223         rflags |= v9fs_mapped_dotl_flags(flags);
 224
 225         return rflags;
 226 }
 227
 228 /**
 229  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 230  * @dir: directory inode that is being created
 231  * @dentry:  dentry that is being deleted
 232  * @mode: create permissions
 233  * @nd: path information
 234  *
 235  */
 236
 237 static int
 238 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 239                 struct nameidata *nd)
 240 {
 241         int err = 0;
 242         gid_t gid;
 243         int flags;
 244         umode_t mode;
 245         char *name = NULL;
 246         struct file *filp;
 247         struct p9_qid qid;
 248         struct inode *inode;
 249         struct p9_fid *fid = NULL;
 250         struct v9fs_inode *v9inode;
 251         struct p9_fid *dfid, *ofid, *inode_fid;
 252         struct v9fs_session_info *v9ses;
 253         struct posix_acl *pacl = NULL, *dacl = NULL;
 254
 255         v9ses = v9fs_inode2v9ses(dir);
 256         if (nd)
 257                 flags = nd->intent.open.flags;
 258         else {
 259                 /*
 260                  * create call without LOOKUP_OPEN is due
 261                  * to mknod of regular files. So use mknod
 262                  * operation.
 263                  */
 264                 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 265         }
 266
 267         name = (char *) dentry->d_name.name;
 268         p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
 269                  name, flags, omode);
 270
 271         dfid = v9fs_fid_lookup(dentry->d_parent);
 272         if (IS_ERR(dfid)) {
 273                 err = PTR_ERR(dfid);
 274                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 275                 return err;
 276         }
 277
 278         /* clone a fid to use for creation */
 279         ofid = p9_client_walk(dfid, 0, NULL, 1);
 280         if (IS_ERR(ofid)) {
 281                 err = PTR_ERR(ofid);
 282                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 283                 return err;
 284         }
 285
 286         gid = v9fs_get_fsgid_for_create(dir);
 287
 288         mode = omode;
 289         /* Update mode based on ACL value */
 290         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 291         if (err) {
 292                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
 293                          err);
 294                 goto error;
 295         }
 296         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
 297                                     mode, gid, &qid);
 298         if (err < 0) {
 299                 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
 300                          err);
 301                 goto error;
 302         }
 303         v9fs_invalidate_inode_attr(dir);
 304
 305         /* instantiate inode and assign the unopened fid to the dentry */
 306         fid = p9_client_walk(dfid, 1, &name, 1);
 307         if (IS_ERR(fid)) {
 308                 err = PTR_ERR(fid);
 309                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 310                 fid = NULL;
 311                 goto error;
 312         }
 313         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 314         if (IS_ERR(inode)) {
 315                 err = PTR_ERR(inode);
 316                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 317                 goto error;
 318         }
 319         err = v9fs_fid_add(dentry, fid);
 320         if (err < 0)
 321                 goto error;
 322         d_instantiate(dentry, inode);
 323
 324         /* Now set the ACL based on the default value */
 325         v9fs_set_create_acl(dentry, &dacl, &pacl);
 326
 327         v9inode = V9FS_I(inode);
 328         mutex_lock(&v9inode->v_mutex);
 329         if (v9ses->cache && !v9inode->writeback_fid &&
 330             ((flags & O_ACCMODE) != O_RDONLY)) {
 331                 /*
 332                  * clone a fid and add it to writeback_fid
 333                  * we do it during open time instead of
 334                  * page dirty time via write_begin/page_mkwrite
 335                  * because we want write after unlink usecase
 336                  * to work.
 337                  */
 338                 inode_fid = v9fs_writeback_fid(dentry);
 339                 if (IS_ERR(inode_fid)) {
 340                         err = PTR_ERR(inode_fid);
 341                         mutex_unlock(&v9inode->v_mutex);
 342                         goto err_clunk_old_fid;
 343                 }
 344                 v9inode->writeback_fid = (void *) inode_fid;
 345         }
 346         mutex_unlock(&v9inode->v_mutex);
 347         /* Since we are opening a file, assign the open fid to the file */
 348         filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
 349         if (IS_ERR(filp)) {
 350                 err = PTR_ERR(filp);
 351                 goto err_clunk_old_fid;
 352         }
 353         filp->private_data = ofid;
 354 #ifdef CONFIG_9P_FSCACHE
 355         if (v9ses->cache)
 356                 v9fs_cache_inode_set_cookie(inode, filp);
 357 #endif
 358         return 0;
 359
 360 error:
 361         if (fid)
 362                 p9_client_clunk(fid);
 363 err_clunk_old_fid:
 364         if (ofid)
 365                 p9_client_clunk(ofid);
 366         v9fs_set_create_acl(NULL, &dacl, &pacl);
 367         return err;
 368 }
 369
 370 /**
 371  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 372  * @dir:  inode that is being unlinked
 373  * @dentry: dentry that is being unlinked
 374  * @mode: mode for new directory
 375  *
 376  */
 377
 378 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 379                                struct dentry *dentry, umode_t omode)
 380 {
 381         int err;
 382         struct v9fs_session_info *v9ses;
 383         struct p9_fid *fid = NULL, *dfid = NULL;
 384         gid_t gid;
 385         char *name;
 386         umode_t mode;
 387         struct inode *inode;
 388         struct p9_qid qid;
 389         struct dentry *dir_dentry;
 390         struct posix_acl *dacl = NULL, *pacl = NULL;
 391
 392         p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 393         err = 0;
 394         v9ses = v9fs_inode2v9ses(dir);
 395
 396         omode |= S_IFDIR;
 397         if (dir->i_mode & S_ISGID)
 398                 omode |= S_ISGID;
 399
 400         dir_dentry = dentry->d_parent;
 401         dfid = v9fs_fid_lookup(dir_dentry);
 402         if (IS_ERR(dfid)) {
 403                 err = PTR_ERR(dfid);
 404                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 405                 dfid = NULL;
 406                 goto error;
 407         }
 408
 409         gid = v9fs_get_fsgid_for_create(dir);
 410         mode = omode;
 411         /* Update mode based on ACL value */
 412         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 413         if (err) {
 414                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 415                          err);
 416                 goto error;
 417         }
 418         name = (char *) dentry->d_name.name;
 419         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 420         if (err < 0)
 421                 goto error;
 422
 423         /* instantiate inode and assign the unopened fid to the dentry */
 424         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 425                 fid = p9_client_walk(dfid, 1, &name, 1);
 426                 if (IS_ERR(fid)) {
 427                         err = PTR_ERR(fid);
 428                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 429                                  err);
 430                         fid = NULL;
 431                         goto error;
 432                 }
 433
 434                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 435                 if (IS_ERR(inode)) {
 436                         err = PTR_ERR(inode);
 437                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 438                                  err);
 439                         goto error;
 440                 }
 441                 err = v9fs_fid_add(dentry, fid);
 442                 if (err < 0)
 443                         goto error;
 444                 d_instantiate(dentry, inode);
 445                 fid = NULL;
 446         } else {
 447                 /*
 448                  * Not in cached mode. No need to populate
 449                  * inode with stat. We need to get an inode
 450                  * so that we can set the acl with dentry
 451                  */
 452                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 453                 if (IS_ERR(inode)) {
 454                         err = PTR_ERR(inode);
 455                         goto error;
 456                 }
 457                 d_instantiate(dentry, inode);
 458         }
 459         /* Now set the ACL based on the default value */
 460         v9fs_set_create_acl(dentry, &dacl, &pacl);
 461         inc_nlink(dir);
 462         v9fs_invalidate_inode_attr(dir);
 463 error:
 464         if (fid)
 465                 p9_client_clunk(fid);
 466         v9fs_set_create_acl(NULL, &dacl, &pacl);
 467         return err;
 468 }
 469
 470 static int
 471 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 472                  struct kstat *stat)
 473 {
 474         int err;
 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         err = -EPERM;
 481         v9ses = v9fs_dentry2v9ses(dentry);
 482         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 483                 generic_fillattr(dentry->d_inode, stat);
 484                 return 0;
 485         }
 486         fid = v9fs_fid_lookup(dentry);
 487         if (IS_ERR(fid))
 488                 return PTR_ERR(fid);
 489
 490         /* Ask for all the fields in stat structure. Server will return
 491          * whatever it supports
 492          */
 493
 494         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 495         if (IS_ERR(st))
 496                 return PTR_ERR(st);
 497
 498         v9fs_stat2inode_dotl(st, dentry->d_inode);
 499         generic_fillattr(dentry->d_inode, stat);
 500         /* Change block size to what the server returned */
 501         stat->blksize = st->st_blksize;
 502
 503         kfree(st);
 504         return 0;
 505 }
 506
 507 /*
 508  * Attribute flags.
 509  */
 510 #define P9_ATTR_MODE            (1 << 0)
 511 #define P9_ATTR_UID             (1 << 1)
 512 #define P9_ATTR_GID             (1 << 2)
 513 #define P9_ATTR_SIZE            (1 << 3)
 514 #define P9_ATTR_ATIME           (1 << 4)
 515 #define P9_ATTR_MTIME           (1 << 5)
 516 #define P9_ATTR_CTIME           (1 << 6)
 517 #define P9_ATTR_ATIME_SET       (1 << 7)
 518 #define P9_ATTR_MTIME_SET       (1 << 8)
 519
 520 struct dotl_iattr_map {
 521         int iattr_valid;
 522         int p9_iattr_valid;
 523 };
 524
 525 static int v9fs_mapped_iattr_valid(int iattr_valid)
 526 {
 527         int i;
 528         int p9_iattr_valid = 0;
 529         struct dotl_iattr_map dotl_iattr_map[] = {
 530                 { ATTR_MODE,            P9_ATTR_MODE },
 531                 { ATTR_UID,             P9_ATTR_UID },
 532                 { ATTR_GID,             P9_ATTR_GID },
 533                 { ATTR_SIZE,            P9_ATTR_SIZE },
 534                 { ATTR_ATIME,           P9_ATTR_ATIME },
 535                 { ATTR_MTIME,           P9_ATTR_MTIME },
 536                 { ATTR_CTIME,           P9_ATTR_CTIME },
 537                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 538                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 539         };
 540         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 541                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 542                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 543         }
 544         return p9_iattr_valid;
 545 }
 546
 547 /**
 548  * v9fs_vfs_setattr_dotl - set file metadata
 549  * @dentry: file whose metadata to set
 550  * @iattr: metadata assignment structure
 551  *
 552  */
 553
 554 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 555 {
 556         int retval;
 557         struct v9fs_session_info *v9ses;
 558         struct p9_fid *fid;
 559         struct p9_iattr_dotl p9attr;
 560
 561         p9_debug(P9_DEBUG_VFS, "\n");
 562
 563         retval = inode_change_ok(dentry->d_inode, iattr);
 564         if (retval)
 565                 return retval;
 566
 567         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 568         p9attr.mode = iattr->ia_mode;
 569         p9attr.uid = iattr->ia_uid;
 570         p9attr.gid = iattr->ia_gid;
 571         p9attr.size = iattr->ia_size;
 572         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 573         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 574         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 575         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 576
 577         retval = -EPERM;
 578         v9ses = v9fs_dentry2v9ses(dentry);
 579         fid = v9fs_fid_lookup(dentry);
 580         if (IS_ERR(fid))
 581                 return PTR_ERR(fid);
 582
 583         /* Write all dirty data */
 584         if (S_ISREG(dentry->d_inode->i_mode))
 585                 filemap_write_and_wait(dentry->d_inode->i_mapping);
 586
 587         retval = p9_client_setattr(fid, &p9attr);
 588         if (retval < 0)
 589                 return retval;
 590
 591         if ((iattr->ia_valid & ATTR_SIZE) &&
 592             iattr->ia_size != i_size_read(dentry->d_inode))
 593                 truncate_setsize(dentry->d_inode, iattr->ia_size);
 594
 595         v9fs_invalidate_inode_attr(dentry->d_inode);
 596         setattr_copy(dentry->d_inode, iattr);
 597         mark_inode_dirty(dentry->d_inode);
 598         if (iattr->ia_valid & ATTR_MODE) {
 599                 /* We also want to update ACL when we update mode bits */
 600                 retval = v9fs_acl_chmod(dentry);
 601                 if (retval < 0)
 602                         return retval;
 603         }
 604         return 0;
 605 }
 606
 607 /**
 608  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 609  * @stat: stat structure
 610  * @inode: inode to populate
 611  * @sb: superblock of filesystem
 612  *
 613  */
 614
 615 void
 616 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 617 {
 618         umode_t mode;
 619         struct v9fs_inode *v9inode = V9FS_I(inode);
 620
 621         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 622                 inode->i_atime.tv_sec = stat->st_atime_sec;
 623                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 624                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 625                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 626                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 627                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 628                 inode->i_uid = stat->st_uid;
 629                 inode->i_gid = stat->st_gid;
 630                 set_nlink(inode, stat->st_nlink);
 631
 632                 mode = stat->st_mode & S_IALLUGO;
 633                 mode |= inode->i_mode & ~S_IALLUGO;
 634                 inode->i_mode = mode;
 635
 636                 i_size_write(inode, stat->st_size);
 637                 inode->i_blocks = stat->st_blocks;
 638         } else {
 639                 if (stat->st_result_mask & P9_STATS_ATIME) {
 640                         inode->i_atime.tv_sec = stat->st_atime_sec;
 641                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 642                 }
 643                 if (stat->st_result_mask & P9_STATS_MTIME) {
 644                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 645                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 646                 }
 647                 if (stat->st_result_mask & P9_STATS_CTIME) {
 648                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 649                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 650                 }
 651                 if (stat->st_result_mask & P9_STATS_UID)
 652                         inode->i_uid = stat->st_uid;
 653                 if (stat->st_result_mask & P9_STATS_GID)
 654                         inode->i_gid = stat->st_gid;
 655                 if (stat->st_result_mask & P9_STATS_NLINK)
 656                         set_nlink(inode, stat->st_nlink);
 657                 if (stat->st_result_mask & P9_STATS_MODE) {
 658                         inode->i_mode = stat->st_mode;
 659                         if ((S_ISBLK(inode->i_mode)) ||
 660                                                 (S_ISCHR(inode->i_mode)))
 661                                 init_special_inode(inode, inode->i_mode,
 662                                                                 inode->i_rdev);
 663                 }
 664                 if (stat->st_result_mask & P9_STATS_RDEV)
 665                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 666                 if (stat->st_result_mask & P9_STATS_SIZE)
 667                         i_size_write(inode, stat->st_size);
 668                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 669                         inode->i_blocks = stat->st_blocks;
 670         }
 671         if (stat->st_result_mask & P9_STATS_GEN)
 672                 inode->i_generation = stat->st_gen;
 673
 674         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 675          * because the inode structure does not have fields for them.
 676          */
 677         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 678 }
 679
 680 static int
 681 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 682                 const char *symname)
 683 {
 684         int err;
 685         gid_t gid;
 686         char *name;
 687         struct p9_qid qid;
 688         struct inode *inode;
 689         struct p9_fid *dfid;
 690         struct p9_fid *fid = NULL;
 691         struct v9fs_session_info *v9ses;
 692
 693         name = (char *) dentry->d_name.name;
 694         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 695         v9ses = v9fs_inode2v9ses(dir);
 696
 697         dfid = v9fs_fid_lookup(dentry->d_parent);
 698         if (IS_ERR(dfid)) {
 699                 err = PTR_ERR(dfid);
 700                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 701                 return err;
 702         }
 703
 704         gid = v9fs_get_fsgid_for_create(dir);
 705
 706         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 707         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 708
 709         if (err < 0) {
 710                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 711                 goto error;
 712         }
 713
 714         v9fs_invalidate_inode_attr(dir);
 715         if (v9ses->cache) {
 716                 /* Now walk from the parent so we can get an unopened fid. */
 717                 fid = p9_client_walk(dfid, 1, &name, 1);
 718                 if (IS_ERR(fid)) {
 719                         err = PTR_ERR(fid);
 720                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 721                                  err);
 722                         fid = NULL;
 723                         goto error;
 724                 }
 725
 726                 /* instantiate inode and assign the unopened fid to dentry */
 727                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 728                 if (IS_ERR(inode)) {
 729                         err = PTR_ERR(inode);
 730                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 731                                  err);
 732                         goto error;
 733                 }
 734                 err = v9fs_fid_add(dentry, fid);
 735                 if (err < 0)
 736                         goto error;
 737                 d_instantiate(dentry, inode);
 738                 fid = NULL;
 739         } else {
 740                 /* Not in cached mode. No need to populate inode with stat */
 741                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 742                 if (IS_ERR(inode)) {
 743                         err = PTR_ERR(inode);
 744                         goto error;
 745                 }
 746                 d_instantiate(dentry, inode);
 747         }
 748
 749 error:
 750         if (fid)
 751                 p9_client_clunk(fid);
 752
 753         return err;
 754 }
 755
 756 /**
 757  * v9fs_vfs_link_dotl - create a hardlink for dotl
 758  * @old_dentry: dentry for file to link to
 759  * @dir: inode destination for new link
 760  * @dentry: dentry for link
 761  *
 762  */
 763
 764 static int
 765 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 766                 struct dentry *dentry)
 767 {
 768         int err;
 769         char *name;
 770         struct dentry *dir_dentry;
 771         struct p9_fid *dfid, *oldfid;
 772         struct v9fs_session_info *v9ses;
 773
 774         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
 775                  dir->i_ino, old_dentry->d_name.name, dentry->d_name.name);
 776
 777         v9ses = v9fs_inode2v9ses(dir);
 778         dir_dentry = dentry->d_parent;
 779         dfid = v9fs_fid_lookup(dir_dentry);
 780         if (IS_ERR(dfid))
 781                 return PTR_ERR(dfid);
 782
 783         oldfid = v9fs_fid_lookup(old_dentry);
 784         if (IS_ERR(oldfid))
 785                 return PTR_ERR(oldfid);
 786
 787         name = (char *) dentry->d_name.name;
 788
 789         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 790
 791         if (err < 0) {
 792                 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 793                 return err;
 794         }
 795
 796         v9fs_invalidate_inode_attr(dir);
 797         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 798                 /* Get the latest stat info from server. */
 799                 struct p9_fid *fid;
 800                 fid = v9fs_fid_lookup(old_dentry);
 801                 if (IS_ERR(fid))
 802                         return PTR_ERR(fid);
 803
 804                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
 805         }
 806         ihold(old_dentry->d_inode);
 807         d_instantiate(dentry, old_dentry->d_inode);
 808
 809         return err;
 810 }
 811
 812 /**
 813  * v9fs_vfs_mknod_dotl - create a special file
 814  * @dir: inode destination for new link
 815  * @dentry: dentry for file
 816  * @mode: mode for creation
 817  * @rdev: device associated with special file
 818  *
 819  */
 820 static int
 821 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 822                 dev_t rdev)
 823 {
 824         int err;
 825         gid_t gid;
 826         char *name;
 827         umode_t mode;
 828         struct v9fs_session_info *v9ses;
 829         struct p9_fid *fid = NULL, *dfid = NULL;
 830         struct inode *inode;
 831         struct p9_qid qid;
 832         struct dentry *dir_dentry;
 833         struct posix_acl *dacl = NULL, *pacl = NULL;
 834
 835         p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
 836                  dir->i_ino, dentry->d_name.name, omode,
 837                  MAJOR(rdev), MINOR(rdev));
 838
 839         if (!new_valid_dev(rdev))
 840                 return -EINVAL;
 841
 842         v9ses = v9fs_inode2v9ses(dir);
 843         dir_dentry = dentry->d_parent;
 844         dfid = v9fs_fid_lookup(dir_dentry);
 845         if (IS_ERR(dfid)) {
 846                 err = PTR_ERR(dfid);
 847                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 848                 dfid = NULL;
 849                 goto error;
 850         }
 851
 852         gid = v9fs_get_fsgid_for_create(dir);
 853         mode = omode;
 854         /* Update mode based on ACL value */
 855         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 856         if (err) {
 857                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 858                          err);
 859                 goto error;
 860         }
 861         name = (char *) dentry->d_name.name;
 862
 863         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 864         if (err < 0)
 865                 goto error;
 866
 867         v9fs_invalidate_inode_attr(dir);
 868         /* instantiate inode and assign the unopened fid to the dentry */
 869         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 870                 fid = p9_client_walk(dfid, 1, &name, 1);
 871                 if (IS_ERR(fid)) {
 872                         err = PTR_ERR(fid);
 873                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 874                                  err);
 875                         fid = NULL;
 876                         goto error;
 877                 }
 878
 879                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 880                 if (IS_ERR(inode)) {
 881                         err = PTR_ERR(inode);
 882                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 883                                  err);
 884                         goto error;
 885                 }
 886                 err = v9fs_fid_add(dentry, fid);
 887                 if (err < 0)
 888                         goto error;
 889                 d_instantiate(dentry, inode);
 890                 fid = NULL;
 891         } else {
 892                 /*
 893                  * Not in cached mode. No need to populate inode with stat.
 894                  * socket syscall returns a fd, so we need instantiate
 895                  */
 896                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 897                 if (IS_ERR(inode)) {
 898                         err = PTR_ERR(inode);
 899                         goto error;
 900                 }
 901                 d_instantiate(dentry, inode);
 902         }
 903         /* Now set the ACL based on the default value */
 904         v9fs_set_create_acl(dentry, &dacl, &pacl);
 905 error:
 906         if (fid)
 907                 p9_client_clunk(fid);
 908         v9fs_set_create_acl(NULL, &dacl, &pacl);
 909         return err;
 910 }
 911
 912 /**
 913  * v9fs_vfs_follow_link_dotl - follow a symlink path
 914  * @dentry: dentry for symlink
 915  * @nd: nameidata
 916  *
 917  */
 918
 919 static void *
 920 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
 921 {
 922         int retval;
 923         struct p9_fid *fid;
 924         char *link = __getname();
 925         char *target;
 926
 927         p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
 928
 929         if (!link) {
 930                 link = ERR_PTR(-ENOMEM);
 931                 goto ndset;
 932         }
 933         fid = v9fs_fid_lookup(dentry);
 934         if (IS_ERR(fid)) {
 935                 __putname(link);
 936                 link = ERR_CAST(fid);
 937                 goto ndset;
 938         }
 939         retval = p9_client_readlink(fid, &target);
 940         if (!retval) {
 941                 strcpy(link, target);
 942                 kfree(target);
 943                 goto ndset;
 944         }
 945         __putname(link);
 946         link = ERR_PTR(retval);
 947 ndset:
 948         nd_set_link(nd, link);
 949         return NULL;
 950 }
 951
 952 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 953 {
 954         loff_t i_size;
 955         struct p9_stat_dotl *st;
 956         struct v9fs_session_info *v9ses;
 957
 958         v9ses = v9fs_inode2v9ses(inode);
 959         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 960         if (IS_ERR(st))
 961                 return PTR_ERR(st);
 962         /*
 963          * Don't update inode if the file type is different
 964          */
 965         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 966                 goto out;
 967
 968         spin_lock(&inode->i_lock);
 969         /*
 970          * We don't want to refresh inode->i_size,
 971          * because we may have cached data
 972          */
 973         i_size = inode->i_size;
 974         v9fs_stat2inode_dotl(st, inode);
 975         if (v9ses->cache)
 976                 inode->i_size = i_size;
 977         spin_unlock(&inode->i_lock);
 978 out:
 979         kfree(st);
 980         return 0;
 981 }
 982
 983 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 984         .create = v9fs_vfs_create_dotl,
 985         .lookup = v9fs_vfs_lookup,
 986         .link = v9fs_vfs_link_dotl,
 987         .symlink = v9fs_vfs_symlink_dotl,
 988         .unlink = v9fs_vfs_unlink,
 989         .mkdir = v9fs_vfs_mkdir_dotl,
 990         .rmdir = v9fs_vfs_rmdir,
 991         .mknod = v9fs_vfs_mknod_dotl,
 992         .rename = v9fs_vfs_rename,
 993         .getattr = v9fs_vfs_getattr_dotl,
 994         .setattr = v9fs_vfs_setattr_dotl,
 995         .setxattr = generic_setxattr,
 996         .getxattr = generic_getxattr,
 997         .removexattr = generic_removexattr,
 998         .listxattr = v9fs_listxattr,
 999         .get_acl = v9fs_iop_get_acl,
1000 };
1001
1002 const struct inode_operations v9fs_file_inode_operations_dotl = {
1003         .getattr = v9fs_vfs_getattr_dotl,
1004         .setattr = v9fs_vfs_setattr_dotl,
1005         .setxattr = generic_setxattr,
1006         .getxattr = generic_getxattr,
1007         .removexattr = generic_removexattr,
1008         .listxattr = v9fs_listxattr,
1009         .get_acl = v9fs_iop_get_acl,
1010 };
1011
1012 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1013         .readlink = generic_readlink,
1014         .follow_link = v9fs_vfs_follow_link_dotl,
1015         .put_link = v9fs_vfs_put_link,
1016         .getattr = v9fs_vfs_getattr_dotl,
1017         .setattr = v9fs_vfs_setattr_dotl,
1018         .setxattr = generic_setxattr,
1019         .getxattr = generic_getxattr,
1020         .removexattr = generic_removexattr,
1021         .listxattr = v9fs_listxattr,
1022 };