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         unlock_new_inode(inode);
 153         iput(inode);
 154         return ERR_PTR(retval);
 155
 156 }
 157
 158 struct inode *
 159 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 160                          struct super_block *sb, int new)
 161 {
 162         struct p9_stat_dotl *st;
 163         struct inode *inode = NULL;
 164
 165         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
 166         if (IS_ERR(st))
 167                 return ERR_CAST(st);
 168
 169         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
 170         kfree(st);
 171         return inode;
 172 }
 173
 174 struct dotl_openflag_map {
 175         int open_flag;
 176         int dotl_flag;
 177 };
 178
 179 static int v9fs_mapped_dotl_flags(int flags)
 180 {
 181         int i;
 182         int rflags = 0;
 183         struct dotl_openflag_map dotl_oflag_map[] = {
 184                 { O_CREAT,      P9_DOTL_CREATE },
 185                 { O_EXCL,       P9_DOTL_EXCL },
 186                 { O_NOCTTY,     P9_DOTL_NOCTTY },
 187                 { O_APPEND,     P9_DOTL_APPEND },
 188                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
 189                 { O_DSYNC,      P9_DOTL_DSYNC },
 190                 { FASYNC,       P9_DOTL_FASYNC },
 191                 { O_DIRECT,     P9_DOTL_DIRECT },
 192                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
 193                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
 194                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
 195                 { O_NOATIME,    P9_DOTL_NOATIME },
 196                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
 197                 { O_SYNC,       P9_DOTL_SYNC},
 198         };
 199         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
 200                 if (flags & dotl_oflag_map[i].open_flag)
 201                         rflags |= dotl_oflag_map[i].dotl_flag;
 202         }
 203         return rflags;
 204 }
 205
 206 /**
 207  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 208  * plan 9 open flag.
 209  * @flags: flags to convert
 210  */
 211 int v9fs_open_to_dotl_flags(int flags)
 212 {
 213         int rflags = 0;
 214
 215         /*
 216          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
 217          * and P9_DOTL_NOACCESS
 218          */
 219         rflags |= flags & O_ACCMODE;
 220         rflags |= v9fs_mapped_dotl_flags(flags);
 221
 222         return rflags;
 223 }
 224
 225 /**
 226  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 227  * @dir: directory inode that is being created
 228  * @dentry:  dentry that is being deleted
 229  * @omode: create permissions
 230  *
 231  */
 232
 233 static int
 234 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 235                 bool excl)
 236 {
 237         return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 238 }
 239
 240 static int
 241 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 242                           struct file *file, unsigned flags, umode_t omode,
 243                           int *opened)
 244 {
 245         int err = 0;
 246         kgid_t gid;
 247         umode_t mode;
 248         char *name = NULL;
 249         struct p9_qid qid;
 250         struct inode *inode;
 251         struct p9_fid *fid = NULL;
 252         struct v9fs_inode *v9inode;
 253         struct p9_fid *dfid, *ofid, *inode_fid;
 254         struct v9fs_session_info *v9ses;
 255         struct posix_acl *pacl = NULL, *dacl = NULL;
 256         struct dentry *res = NULL;
 257
 258         if (d_unhashed(dentry)) {
 259                 res = v9fs_vfs_lookup(dir, dentry, 0);
 260                 if (IS_ERR(res))
 261                         return PTR_ERR(res);
 262
 263                 if (res)
 264                         dentry = res;
 265         }
 266
 267         /* Only creates */
 268         if (!(flags & O_CREAT) || dentry->d_inode)
 269                 return  finish_no_open(file, res);
 270
 271         v9ses = v9fs_inode2v9ses(dir);
 272
 273         name = (char *) dentry->d_name.name;
 274         p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
 275                  name, flags, omode);
 276
 277         dfid = v9fs_fid_lookup(dentry->d_parent);
 278         if (IS_ERR(dfid)) {
 279                 err = PTR_ERR(dfid);
 280                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 281                 goto out;
 282         }
 283
 284         /* clone a fid to use for creation */
 285         ofid = p9_client_walk(dfid, 0, NULL, 1);
 286         if (IS_ERR(ofid)) {
 287                 err = PTR_ERR(ofid);
 288                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 289                 goto out;
 290         }
 291
 292         gid = v9fs_get_fsgid_for_create(dir);
 293
 294         mode = omode;
 295         /* Update mode based on ACL value */
 296         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 297         if (err) {
 298                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
 299                          err);
 300                 goto error;
 301         }
 302         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
 303                                     mode, gid, &qid);
 304         if (err < 0) {
 305                 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
 306                          err);
 307                 goto error;
 308         }
 309         v9fs_invalidate_inode_attr(dir);
 310
 311         /* instantiate inode and assign the unopened fid to the dentry */
 312         fid = p9_client_walk(dfid, 1, &name, 1);
 313         if (IS_ERR(fid)) {
 314                 err = PTR_ERR(fid);
 315                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 316                 fid = NULL;
 317                 goto error;
 318         }
 319         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 320         if (IS_ERR(inode)) {
 321                 err = PTR_ERR(inode);
 322                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 323                 goto error;
 324         }
 325         /* Now set the ACL based on the default value */
 326         v9fs_set_create_acl(inode, fid, dacl, pacl);
 327
 328         v9fs_fid_add(dentry, fid);
 329         d_instantiate(dentry, inode);
 330
 331         v9inode = V9FS_I(inode);
 332         mutex_lock(&v9inode->v_mutex);
 333         if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
 334             !v9inode->writeback_fid &&
 335             ((flags & O_ACCMODE) != O_RDONLY)) {
 336                 /*
 337                  * clone a fid and add it to writeback_fid
 338                  * we do it during open time instead of
 339                  * page dirty time via write_begin/page_mkwrite
 340                  * because we want write after unlink usecase
 341                  * to work.
 342                  */
 343                 inode_fid = v9fs_writeback_fid(dentry);
 344                 if (IS_ERR(inode_fid)) {
 345                         err = PTR_ERR(inode_fid);
 346                         mutex_unlock(&v9inode->v_mutex);
 347                         goto err_clunk_old_fid;
 348                 }
 349                 v9inode->writeback_fid = (void *) inode_fid;
 350         }
 351         mutex_unlock(&v9inode->v_mutex);
 352         /* Since we are opening a file, assign the open fid to the file */
 353         err = finish_open(file, dentry, generic_file_open, opened);
 354         if (err)
 355                 goto err_clunk_old_fid;
 356         file->private_data = ofid;
 357         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
 358                 v9fs_cache_inode_set_cookie(inode, file);
 359         *opened |= FILE_CREATED;
 360 out:
 361         v9fs_put_acl(dacl, pacl);
 362         dput(res);
 363         return err;
 364
 365 error:
 366         if (fid)
 367                 p9_client_clunk(fid);
 368 err_clunk_old_fid:
 369         if (ofid)
 370                 p9_client_clunk(ofid);
 371         goto out;
 372 }
 373
 374 /**
 375  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 376  * @dir:  inode that is being unlinked
 377  * @dentry: dentry that is being unlinked
 378  * @omode: mode for new directory
 379  *
 380  */
 381
 382 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 383                                struct dentry *dentry, umode_t omode)
 384 {
 385         int err;
 386         struct v9fs_session_info *v9ses;
 387         struct p9_fid *fid = NULL, *dfid = NULL;
 388         kgid_t gid;
 389         char *name;
 390         umode_t mode;
 391         struct inode *inode;
 392         struct p9_qid qid;
 393         struct dentry *dir_dentry;
 394         struct posix_acl *dacl = NULL, *pacl = NULL;
 395
 396         p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
 397         err = 0;
 398         v9ses = v9fs_inode2v9ses(dir);
 399
 400         omode |= S_IFDIR;
 401         if (dir->i_mode & S_ISGID)
 402                 omode |= S_ISGID;
 403
 404         dir_dentry = dentry->d_parent;
 405         dfid = v9fs_fid_lookup(dir_dentry);
 406         if (IS_ERR(dfid)) {
 407                 err = PTR_ERR(dfid);
 408                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 409                 dfid = NULL;
 410                 goto error;
 411         }
 412
 413         gid = v9fs_get_fsgid_for_create(dir);
 414         mode = omode;
 415         /* Update mode based on ACL value */
 416         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 417         if (err) {
 418                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 419                          err);
 420                 goto error;
 421         }
 422         name = (char *) dentry->d_name.name;
 423         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 424         if (err < 0)
 425                 goto error;
 426
 427         fid = p9_client_walk(dfid, 1, &name, 1);
 428         if (IS_ERR(fid)) {
 429                 err = PTR_ERR(fid);
 430                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 431                          err);
 432                 fid = NULL;
 433                 goto error;
 434         }
 435
 436         /* instantiate inode and assign the unopened fid to the dentry */
 437         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 438                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 439                 if (IS_ERR(inode)) {
 440                         err = PTR_ERR(inode);
 441                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 442                                  err);
 443                         goto error;
 444                 }
 445                 v9fs_fid_add(dentry, fid);
 446                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 447                 d_instantiate(dentry, inode);
 448                 fid = NULL;
 449                 err = 0;
 450         } else {
 451                 /*
 452                  * Not in cached mode. No need to populate
 453                  * inode with stat. We need to get an inode
 454                  * so that we can set the acl with dentry
 455                  */
 456                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 457                 if (IS_ERR(inode)) {
 458                         err = PTR_ERR(inode);
 459                         goto error;
 460                 }
 461                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 462                 d_instantiate(dentry, inode);
 463         }
 464         inc_nlink(dir);
 465         v9fs_invalidate_inode_attr(dir);
 466 error:
 467         if (fid)
 468                 p9_client_clunk(fid);
 469         v9fs_put_acl(dacl, pacl);
 470         return err;
 471 }
 472
 473 static int
 474 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 475                  struct kstat *stat)
 476 {
 477         struct v9fs_session_info *v9ses;
 478         struct p9_fid *fid;
 479         struct p9_stat_dotl *st;
 480
 481         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 482         v9ses = v9fs_dentry2v9ses(dentry);
 483         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 484                 generic_fillattr(dentry->d_inode, stat);
 485                 return 0;
 486         }
 487         fid = v9fs_fid_lookup(dentry);
 488         if (IS_ERR(fid))
 489                 return PTR_ERR(fid);
 490
 491         /* Ask for all the fields in stat structure. Server will return
 492          * whatever it supports
 493          */
 494
 495         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 496         if (IS_ERR(st))
 497                 return PTR_ERR(st);
 498
 499         v9fs_stat2inode_dotl(st, dentry->d_inode);
 500         generic_fillattr(dentry->d_inode, stat);
 501         /* Change block size to what the server returned */
 502         stat->blksize = st->st_blksize;
 503
 504         kfree(st);
 505         return 0;
 506 }
 507
 508 /*
 509  * Attribute flags.
 510  */
 511 #define P9_ATTR_MODE            (1 << 0)
 512 #define P9_ATTR_UID             (1 << 1)
 513 #define P9_ATTR_GID             (1 << 2)
 514 #define P9_ATTR_SIZE            (1 << 3)
 515 #define P9_ATTR_ATIME           (1 << 4)
 516 #define P9_ATTR_MTIME           (1 << 5)
 517 #define P9_ATTR_CTIME           (1 << 6)
 518 #define P9_ATTR_ATIME_SET       (1 << 7)
 519 #define P9_ATTR_MTIME_SET       (1 << 8)
 520
 521 struct dotl_iattr_map {
 522         int iattr_valid;
 523         int p9_iattr_valid;
 524 };
 525
 526 static int v9fs_mapped_iattr_valid(int iattr_valid)
 527 {
 528         int i;
 529         int p9_iattr_valid = 0;
 530         struct dotl_iattr_map dotl_iattr_map[] = {
 531                 { ATTR_MODE,            P9_ATTR_MODE },
 532                 { ATTR_UID,             P9_ATTR_UID },
 533                 { ATTR_GID,             P9_ATTR_GID },
 534                 { ATTR_SIZE,            P9_ATTR_SIZE },
 535                 { ATTR_ATIME,           P9_ATTR_ATIME },
 536                 { ATTR_MTIME,           P9_ATTR_MTIME },
 537                 { ATTR_CTIME,           P9_ATTR_CTIME },
 538                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 539                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 540         };
 541         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 542                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 543                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 544         }
 545         return p9_iattr_valid;
 546 }
 547
 548 /**
 549  * v9fs_vfs_setattr_dotl - set file metadata
 550  * @dentry: file whose metadata to set
 551  * @iattr: metadata assignment structure
 552  *
 553  */
 554
 555 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 556 {
 557         int retval;
 558         struct p9_fid *fid;
 559         struct p9_iattr_dotl p9attr;
 560         struct inode *inode = dentry->d_inode;
 561
 562         p9_debug(P9_DEBUG_VFS, "\n");
 563
 564         retval = inode_change_ok(inode, iattr);
 565         if (retval)
 566                 return retval;
 567
 568         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 569         p9attr.mode = iattr->ia_mode;
 570         p9attr.uid = iattr->ia_uid;
 571         p9attr.gid = iattr->ia_gid;
 572         p9attr.size = iattr->ia_size;
 573         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 574         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 575         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 576         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 577
 578         fid = v9fs_fid_lookup(dentry);
 579         if (IS_ERR(fid))
 580                 return PTR_ERR(fid);
 581
 582         /* Write all dirty data */
 583         if (S_ISREG(inode->i_mode))
 584                 filemap_write_and_wait(inode->i_mapping);
 585
 586         retval = p9_client_setattr(fid, &p9attr);
 587         if (retval < 0)
 588                 return retval;
 589
 590         if ((iattr->ia_valid & ATTR_SIZE) &&
 591             iattr->ia_size != i_size_read(inode))
 592                 truncate_setsize(inode, iattr->ia_size);
 593
 594         v9fs_invalidate_inode_attr(inode);
 595         setattr_copy(inode, iattr);
 596         mark_inode_dirty(inode);
 597         if (iattr->ia_valid & ATTR_MODE) {
 598                 /* We also want to update ACL when we update mode bits */
 599                 retval = v9fs_acl_chmod(inode, fid);
 600                 if (retval < 0)
 601                         return retval;
 602         }
 603         return 0;
 604 }
 605
 606 /**
 607  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 608  * @stat: stat structure
 609  * @inode: inode to populate
 610  *
 611  */
 612
 613 void
 614 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 615 {
 616         umode_t mode;
 617         struct v9fs_inode *v9inode = V9FS_I(inode);
 618
 619         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 620                 inode->i_atime.tv_sec = stat->st_atime_sec;
 621                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 622                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 623                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 624                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 625                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 626                 inode->i_uid = stat->st_uid;
 627                 inode->i_gid = stat->st_gid;
 628                 set_nlink(inode, stat->st_nlink);
 629
 630                 mode = stat->st_mode & S_IALLUGO;
 631                 mode |= inode->i_mode & ~S_IALLUGO;
 632                 inode->i_mode = mode;
 633
 634                 i_size_write(inode, stat->st_size);
 635                 inode->i_blocks = stat->st_blocks;
 636         } else {
 637                 if (stat->st_result_mask & P9_STATS_ATIME) {
 638                         inode->i_atime.tv_sec = stat->st_atime_sec;
 639                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 640                 }
 641                 if (stat->st_result_mask & P9_STATS_MTIME) {
 642                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 643                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 644                 }
 645                 if (stat->st_result_mask & P9_STATS_CTIME) {
 646                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 647                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 648                 }
 649                 if (stat->st_result_mask & P9_STATS_UID)
 650                         inode->i_uid = stat->st_uid;
 651                 if (stat->st_result_mask & P9_STATS_GID)
 652                         inode->i_gid = stat->st_gid;
 653                 if (stat->st_result_mask & P9_STATS_NLINK)
 654                         set_nlink(inode, stat->st_nlink);
 655                 if (stat->st_result_mask & P9_STATS_MODE) {
 656                         inode->i_mode = stat->st_mode;
 657                         if ((S_ISBLK(inode->i_mode)) ||
 658                                                 (S_ISCHR(inode->i_mode)))
 659                                 init_special_inode(inode, inode->i_mode,
 660                                                                 inode->i_rdev);
 661                 }
 662                 if (stat->st_result_mask & P9_STATS_RDEV)
 663                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 664                 if (stat->st_result_mask & P9_STATS_SIZE)
 665                         i_size_write(inode, stat->st_size);
 666                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 667                         inode->i_blocks = stat->st_blocks;
 668         }
 669         if (stat->st_result_mask & P9_STATS_GEN)
 670                 inode->i_generation = stat->st_gen;
 671
 672         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 673          * because the inode structure does not have fields for them.
 674          */
 675         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 676 }
 677
 678 static int
 679 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 680                 const char *symname)
 681 {
 682         int err;
 683         kgid_t gid;
 684         char *name;
 685         struct p9_qid qid;
 686         struct inode *inode;
 687         struct p9_fid *dfid;
 688         struct p9_fid *fid = NULL;
 689         struct v9fs_session_info *v9ses;
 690
 691         name = (char *) dentry->d_name.name;
 692         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 693         v9ses = v9fs_inode2v9ses(dir);
 694
 695         dfid = v9fs_fid_lookup(dentry->d_parent);
 696         if (IS_ERR(dfid)) {
 697                 err = PTR_ERR(dfid);
 698                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 699                 return err;
 700         }
 701
 702         gid = v9fs_get_fsgid_for_create(dir);
 703
 704         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 705         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 706
 707         if (err < 0) {
 708                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 709                 goto error;
 710         }
 711
 712         v9fs_invalidate_inode_attr(dir);
 713         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 714                 /* Now walk from the parent so we can get an unopened fid. */
 715                 fid = p9_client_walk(dfid, 1, &name, 1);
 716                 if (IS_ERR(fid)) {
 717                         err = PTR_ERR(fid);
 718                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 719                                  err);
 720                         fid = NULL;
 721                         goto error;
 722                 }
 723
 724                 /* instantiate inode and assign the unopened fid to dentry */
 725                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 726                 if (IS_ERR(inode)) {
 727                         err = PTR_ERR(inode);
 728                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 729                                  err);
 730                         goto error;
 731                 }
 732                 v9fs_fid_add(dentry, fid);
 733                 d_instantiate(dentry, inode);
 734                 fid = NULL;
 735                 err = 0;
 736         } else {
 737                 /* Not in cached mode. No need to populate inode with stat */
 738                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 739                 if (IS_ERR(inode)) {
 740                         err = PTR_ERR(inode);
 741                         goto error;
 742                 }
 743                 d_instantiate(dentry, inode);
 744         }
 745
 746 error:
 747         if (fid)
 748                 p9_client_clunk(fid);
 749
 750         return err;
 751 }
 752
 753 /**
 754  * v9fs_vfs_link_dotl - create a hardlink for dotl
 755  * @old_dentry: dentry for file to link to
 756  * @dir: inode destination for new link
 757  * @dentry: dentry for link
 758  *
 759  */
 760
 761 static int
 762 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 763                 struct dentry *dentry)
 764 {
 765         int err;
 766         struct dentry *dir_dentry;
 767         struct p9_fid *dfid, *oldfid;
 768         struct v9fs_session_info *v9ses;
 769
 770         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
 771                  dir->i_ino, old_dentry, dentry);
 772
 773         v9ses = v9fs_inode2v9ses(dir);
 774         dir_dentry = dentry->d_parent;
 775         dfid = v9fs_fid_lookup(dir_dentry);
 776         if (IS_ERR(dfid))
 777                 return PTR_ERR(dfid);
 778
 779         oldfid = v9fs_fid_lookup(old_dentry);
 780         if (IS_ERR(oldfid))
 781                 return PTR_ERR(oldfid);
 782
 783         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 784
 785         if (err < 0) {
 786                 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 787                 return err;
 788         }
 789
 790         v9fs_invalidate_inode_attr(dir);
 791         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 792                 /* Get the latest stat info from server. */
 793                 struct p9_fid *fid;
 794                 fid = v9fs_fid_lookup(old_dentry);
 795                 if (IS_ERR(fid))
 796                         return PTR_ERR(fid);
 797
 798                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
 799         }
 800         ihold(old_dentry->d_inode);
 801         d_instantiate(dentry, old_dentry->d_inode);
 802
 803         return err;
 804 }
 805
 806 /**
 807  * v9fs_vfs_mknod_dotl - create a special file
 808  * @dir: inode destination for new link
 809  * @dentry: dentry for file
 810  * @omode: mode for creation
 811  * @rdev: device associated with special file
 812  *
 813  */
 814 static int
 815 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 816                 dev_t rdev)
 817 {
 818         int err;
 819         kgid_t gid;
 820         char *name;
 821         umode_t mode;
 822         struct v9fs_session_info *v9ses;
 823         struct p9_fid *fid = NULL, *dfid = NULL;
 824         struct inode *inode;
 825         struct p9_qid qid;
 826         struct dentry *dir_dentry;
 827         struct posix_acl *dacl = NULL, *pacl = NULL;
 828
 829         p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
 830                  dir->i_ino, dentry->d_name.name, omode,
 831                  MAJOR(rdev), MINOR(rdev));
 832
 833         if (!new_valid_dev(rdev))
 834                 return -EINVAL;
 835
 836         v9ses = v9fs_inode2v9ses(dir);
 837         dir_dentry = dentry->d_parent;
 838         dfid = v9fs_fid_lookup(dir_dentry);
 839         if (IS_ERR(dfid)) {
 840                 err = PTR_ERR(dfid);
 841                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 842                 dfid = NULL;
 843                 goto error;
 844         }
 845
 846         gid = v9fs_get_fsgid_for_create(dir);
 847         mode = omode;
 848         /* Update mode based on ACL value */
 849         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 850         if (err) {
 851                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 852                          err);
 853                 goto error;
 854         }
 855         name = (char *) dentry->d_name.name;
 856
 857         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 858         if (err < 0)
 859                 goto error;
 860
 861         v9fs_invalidate_inode_attr(dir);
 862         fid = p9_client_walk(dfid, 1, &name, 1);
 863         if (IS_ERR(fid)) {
 864                 err = PTR_ERR(fid);
 865                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 866                          err);
 867                 fid = NULL;
 868                 goto error;
 869         }
 870
 871         /* instantiate inode and assign the unopened fid to the dentry */
 872         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 873                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 874                 if (IS_ERR(inode)) {
 875                         err = PTR_ERR(inode);
 876                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 877                                  err);
 878                         goto error;
 879                 }
 880                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 881                 v9fs_fid_add(dentry, fid);
 882                 d_instantiate(dentry, inode);
 883                 fid = NULL;
 884                 err = 0;
 885         } else {
 886                 /*
 887                  * Not in cached mode. No need to populate inode with stat.
 888                  * socket syscall returns a fd, so we need instantiate
 889                  */
 890                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 891                 if (IS_ERR(inode)) {
 892                         err = PTR_ERR(inode);
 893                         goto error;
 894                 }
 895                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 896                 d_instantiate(dentry, inode);
 897         }
 898 error:
 899         if (fid)
 900                 p9_client_clunk(fid);
 901         v9fs_put_acl(dacl, pacl);
 902         return err;
 903 }
 904
 905 /**
 906  * v9fs_vfs_follow_link_dotl - follow a symlink path
 907  * @dentry: dentry for symlink
 908  * @nd: nameidata
 909  *
 910  */
 911
 912 static void *
 913 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
 914 {
 915         int retval;
 916         struct p9_fid *fid;
 917         char *link = __getname();
 918         char *target;
 919
 920         p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
 921
 922         if (!link) {
 923                 link = ERR_PTR(-ENOMEM);
 924                 goto ndset;
 925         }
 926         fid = v9fs_fid_lookup(dentry);
 927         if (IS_ERR(fid)) {
 928                 __putname(link);
 929                 link = ERR_CAST(fid);
 930                 goto ndset;
 931         }
 932         retval = p9_client_readlink(fid, &target);
 933         if (!retval) {
 934                 strcpy(link, target);
 935                 kfree(target);
 936                 goto ndset;
 937         }
 938         __putname(link);
 939         link = ERR_PTR(retval);
 940 ndset:
 941         nd_set_link(nd, link);
 942         return NULL;
 943 }
 944
 945 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 946 {
 947         loff_t i_size;
 948         struct p9_stat_dotl *st;
 949         struct v9fs_session_info *v9ses;
 950
 951         v9ses = v9fs_inode2v9ses(inode);
 952         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 953         if (IS_ERR(st))
 954                 return PTR_ERR(st);
 955         /*
 956          * Don't update inode if the file type is different
 957          */
 958         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 959                 goto out;
 960
 961         spin_lock(&inode->i_lock);
 962         /*
 963          * We don't want to refresh inode->i_size,
 964          * because we may have cached data
 965          */
 966         i_size = inode->i_size;
 967         v9fs_stat2inode_dotl(st, inode);
 968         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
 969                 inode->i_size = i_size;
 970         spin_unlock(&inode->i_lock);
 971 out:
 972         kfree(st);
 973         return 0;
 974 }
 975
 976 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 977         .create = v9fs_vfs_create_dotl,
 978         .atomic_open = v9fs_vfs_atomic_open_dotl,
 979         .lookup = v9fs_vfs_lookup,
 980         .link = v9fs_vfs_link_dotl,
 981         .symlink = v9fs_vfs_symlink_dotl,
 982         .unlink = v9fs_vfs_unlink,
 983         .mkdir = v9fs_vfs_mkdir_dotl,
 984         .rmdir = v9fs_vfs_rmdir,
 985         .mknod = v9fs_vfs_mknod_dotl,
 986         .rename = v9fs_vfs_rename,
 987         .getattr = v9fs_vfs_getattr_dotl,
 988         .setattr = v9fs_vfs_setattr_dotl,
 989         .setxattr = generic_setxattr,
 990         .getxattr = generic_getxattr,
 991         .removexattr = generic_removexattr,
 992         .listxattr = v9fs_listxattr,
 993         .get_acl = v9fs_iop_get_acl,
 994 };
 995
 996 const struct inode_operations v9fs_file_inode_operations_dotl = {
 997         .getattr = v9fs_vfs_getattr_dotl,
 998         .setattr = v9fs_vfs_setattr_dotl,
 999         .setxattr = generic_setxattr,
1000         .getxattr = generic_getxattr,
1001         .removexattr = generic_removexattr,
1002         .listxattr = v9fs_listxattr,
1003         .get_acl = v9fs_iop_get_acl,
1004 };
1005
1006 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1007         .readlink = generic_readlink,
1008         .follow_link = v9fs_vfs_follow_link_dotl,
1009         .put_link = v9fs_vfs_put_link,
1010         .getattr = v9fs_vfs_getattr_dotl,
1011         .setattr = v9fs_vfs_setattr_dotl,
1012         .setxattr = generic_setxattr,
1013         .getxattr = generic_getxattr,
1014         .removexattr = generic_removexattr,
1015         .listxattr = v9fs_listxattr,
1016 };