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  * @mode: 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 && !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)
 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  * @mode: 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         char *name;
 389         umode_t mode;
 390         struct inode *inode;
 391         struct p9_qid qid;
 392         struct dentry *dir_dentry;
 393         struct posix_acl *dacl = NULL, *pacl = NULL;
 394
 395         p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 396         err = 0;
 397         v9ses = v9fs_inode2v9ses(dir);
 398
 399         omode |= S_IFDIR;
 400         if (dir->i_mode & S_ISGID)
 401                 omode |= S_ISGID;
 402
 403         dir_dentry = dentry->d_parent;
 404         dfid = v9fs_fid_lookup(dir_dentry);
 405         if (IS_ERR(dfid)) {
 406                 err = PTR_ERR(dfid);
 407                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 408                 dfid = NULL;
 409                 goto error;
 410         }
 411
 412         gid = v9fs_get_fsgid_for_create(dir);
 413         mode = omode;
 414         /* Update mode based on ACL value */
 415         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 416         if (err) {
 417                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 418                          err);
 419                 goto error;
 420         }
 421         name = (char *) dentry->d_name.name;
 422         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 423         if (err < 0)
 424                 goto error;
 425
 426         fid = p9_client_walk(dfid, 1, &name, 1);
 427         if (IS_ERR(fid)) {
 428                 err = PTR_ERR(fid);
 429                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 430                          err);
 431                 fid = NULL;
 432                 goto error;
 433         }
 434
 435         /* instantiate inode and assign the unopened fid to the dentry */
 436         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 437                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 438                 if (IS_ERR(inode)) {
 439                         err = PTR_ERR(inode);
 440                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 441                                  err);
 442                         goto error;
 443                 }
 444                 v9fs_fid_add(dentry, fid);
 445                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 446                 d_instantiate(dentry, inode);
 447                 fid = NULL;
 448                 err = 0;
 449         } else {
 450                 /*
 451                  * Not in cached mode. No need to populate
 452                  * inode with stat. We need to get an inode
 453                  * so that we can set the acl with dentry
 454                  */
 455                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 456                 if (IS_ERR(inode)) {
 457                         err = PTR_ERR(inode);
 458                         goto error;
 459                 }
 460                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 461                 d_instantiate(dentry, inode);
 462         }
 463         inc_nlink(dir);
 464         v9fs_invalidate_inode_attr(dir);
 465 error:
 466         if (fid)
 467                 p9_client_clunk(fid);
 468         v9fs_put_acl(dacl, pacl);
 469         return err;
 470 }
 471
 472 static int
 473 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 474                  struct kstat *stat)
 475 {
 476         int err;
 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         err = -EPERM;
 483         v9ses = v9fs_dentry2v9ses(dentry);
 484         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 485                 generic_fillattr(dentry->d_inode, stat);
 486                 return 0;
 487         }
 488         fid = v9fs_fid_lookup(dentry);
 489         if (IS_ERR(fid))
 490                 return PTR_ERR(fid);
 491
 492         /* Ask for all the fields in stat structure. Server will return
 493          * whatever it supports
 494          */
 495
 496         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 497         if (IS_ERR(st))
 498                 return PTR_ERR(st);
 499
 500         v9fs_stat2inode_dotl(st, dentry->d_inode);
 501         generic_fillattr(dentry->d_inode, stat);
 502         /* Change block size to what the server returned */
 503         stat->blksize = st->st_blksize;
 504
 505         kfree(st);
 506         return 0;
 507 }
 508
 509 /*
 510  * Attribute flags.
 511  */
 512 #define P9_ATTR_MODE            (1 << 0)
 513 #define P9_ATTR_UID             (1 << 1)
 514 #define P9_ATTR_GID             (1 << 2)
 515 #define P9_ATTR_SIZE            (1 << 3)
 516 #define P9_ATTR_ATIME           (1 << 4)
 517 #define P9_ATTR_MTIME           (1 << 5)
 518 #define P9_ATTR_CTIME           (1 << 6)
 519 #define P9_ATTR_ATIME_SET       (1 << 7)
 520 #define P9_ATTR_MTIME_SET       (1 << 8)
 521
 522 struct dotl_iattr_map {
 523         int iattr_valid;
 524         int p9_iattr_valid;
 525 };
 526
 527 static int v9fs_mapped_iattr_valid(int iattr_valid)
 528 {
 529         int i;
 530         int p9_iattr_valid = 0;
 531         struct dotl_iattr_map dotl_iattr_map[] = {
 532                 { ATTR_MODE,            P9_ATTR_MODE },
 533                 { ATTR_UID,             P9_ATTR_UID },
 534                 { ATTR_GID,             P9_ATTR_GID },
 535                 { ATTR_SIZE,            P9_ATTR_SIZE },
 536                 { ATTR_ATIME,           P9_ATTR_ATIME },
 537                 { ATTR_MTIME,           P9_ATTR_MTIME },
 538                 { ATTR_CTIME,           P9_ATTR_CTIME },
 539                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 540                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 541         };
 542         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 543                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 544                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 545         }
 546         return p9_iattr_valid;
 547 }
 548
 549 /**
 550  * v9fs_vfs_setattr_dotl - set file metadata
 551  * @dentry: file whose metadata to set
 552  * @iattr: metadata assignment structure
 553  *
 554  */
 555
 556 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 557 {
 558         int retval;
 559         struct v9fs_session_info *v9ses;
 560         struct p9_fid *fid;
 561         struct p9_iattr_dotl p9attr;
 562         struct inode *inode = dentry->d_inode;
 563
 564         p9_debug(P9_DEBUG_VFS, "\n");
 565
 566         retval = inode_change_ok(inode, iattr);
 567         if (retval)
 568                 return retval;
 569
 570         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 571         p9attr.mode = iattr->ia_mode;
 572         p9attr.uid = iattr->ia_uid;
 573         p9attr.gid = iattr->ia_gid;
 574         p9attr.size = iattr->ia_size;
 575         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 576         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 577         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 578         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 579
 580         retval = -EPERM;
 581         v9ses = v9fs_dentry2v9ses(dentry);
 582         fid = v9fs_fid_lookup(dentry);
 583         if (IS_ERR(fid))
 584                 return PTR_ERR(fid);
 585
 586         /* Write all dirty data */
 587         if (S_ISREG(inode->i_mode))
 588                 filemap_write_and_wait(inode->i_mapping);
 589
 590         retval = p9_client_setattr(fid, &p9attr);
 591         if (retval < 0)
 592                 return retval;
 593
 594         if ((iattr->ia_valid & ATTR_SIZE) &&
 595             iattr->ia_size != i_size_read(inode))
 596                 truncate_setsize(inode, iattr->ia_size);
 597
 598         v9fs_invalidate_inode_attr(inode);
 599         setattr_copy(inode, iattr);
 600         mark_inode_dirty(inode);
 601         if (iattr->ia_valid & ATTR_MODE) {
 602                 /* We also want to update ACL when we update mode bits */
 603                 retval = v9fs_acl_chmod(inode, fid);
 604                 if (retval < 0)
 605                         return retval;
 606         }
 607         return 0;
 608 }
 609
 610 /**
 611  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 612  * @stat: stat structure
 613  * @inode: inode to populate
 614  * @sb: superblock of filesystem
 615  *
 616  */
 617
 618 void
 619 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 620 {
 621         umode_t mode;
 622         struct v9fs_inode *v9inode = V9FS_I(inode);
 623
 624         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 625                 inode->i_atime.tv_sec = stat->st_atime_sec;
 626                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 627                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 628                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 629                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 630                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 631                 inode->i_uid = stat->st_uid;
 632                 inode->i_gid = stat->st_gid;
 633                 set_nlink(inode, stat->st_nlink);
 634
 635                 mode = stat->st_mode & S_IALLUGO;
 636                 mode |= inode->i_mode & ~S_IALLUGO;
 637                 inode->i_mode = mode;
 638
 639                 i_size_write(inode, stat->st_size);
 640                 inode->i_blocks = stat->st_blocks;
 641         } else {
 642                 if (stat->st_result_mask & P9_STATS_ATIME) {
 643                         inode->i_atime.tv_sec = stat->st_atime_sec;
 644                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 645                 }
 646                 if (stat->st_result_mask & P9_STATS_MTIME) {
 647                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 648                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 649                 }
 650                 if (stat->st_result_mask & P9_STATS_CTIME) {
 651                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 652                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 653                 }
 654                 if (stat->st_result_mask & P9_STATS_UID)
 655                         inode->i_uid = stat->st_uid;
 656                 if (stat->st_result_mask & P9_STATS_GID)
 657                         inode->i_gid = stat->st_gid;
 658                 if (stat->st_result_mask & P9_STATS_NLINK)
 659                         set_nlink(inode, stat->st_nlink);
 660                 if (stat->st_result_mask & P9_STATS_MODE) {
 661                         inode->i_mode = stat->st_mode;
 662                         if ((S_ISBLK(inode->i_mode)) ||
 663                                                 (S_ISCHR(inode->i_mode)))
 664                                 init_special_inode(inode, inode->i_mode,
 665                                                                 inode->i_rdev);
 666                 }
 667                 if (stat->st_result_mask & P9_STATS_RDEV)
 668                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 669                 if (stat->st_result_mask & P9_STATS_SIZE)
 670                         i_size_write(inode, stat->st_size);
 671                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 672                         inode->i_blocks = stat->st_blocks;
 673         }
 674         if (stat->st_result_mask & P9_STATS_GEN)
 675                 inode->i_generation = stat->st_gen;
 676
 677         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 678          * because the inode structure does not have fields for them.
 679          */
 680         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 681 }
 682
 683 static int
 684 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 685                 const char *symname)
 686 {
 687         int err;
 688         kgid_t gid;
 689         char *name;
 690         struct p9_qid qid;
 691         struct inode *inode;
 692         struct p9_fid *dfid;
 693         struct p9_fid *fid = NULL;
 694         struct v9fs_session_info *v9ses;
 695
 696         name = (char *) dentry->d_name.name;
 697         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 698         v9ses = v9fs_inode2v9ses(dir);
 699
 700         dfid = v9fs_fid_lookup(dentry->d_parent);
 701         if (IS_ERR(dfid)) {
 702                 err = PTR_ERR(dfid);
 703                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 704                 return err;
 705         }
 706
 707         gid = v9fs_get_fsgid_for_create(dir);
 708
 709         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 710         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 711
 712         if (err < 0) {
 713                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 714                 goto error;
 715         }
 716
 717         v9fs_invalidate_inode_attr(dir);
 718         if (v9ses->cache) {
 719                 /* Now walk from the parent so we can get an unopened fid. */
 720                 fid = p9_client_walk(dfid, 1, &name, 1);
 721                 if (IS_ERR(fid)) {
 722                         err = PTR_ERR(fid);
 723                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 724                                  err);
 725                         fid = NULL;
 726                         goto error;
 727                 }
 728
 729                 /* instantiate inode and assign the unopened fid to dentry */
 730                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 731                 if (IS_ERR(inode)) {
 732                         err = PTR_ERR(inode);
 733                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 734                                  err);
 735                         goto error;
 736                 }
 737                 v9fs_fid_add(dentry, fid);
 738                 d_instantiate(dentry, inode);
 739                 fid = NULL;
 740                 err = 0;
 741         } else {
 742                 /* Not in cached mode. No need to populate inode with stat */
 743                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 744                 if (IS_ERR(inode)) {
 745                         err = PTR_ERR(inode);
 746                         goto error;
 747                 }
 748                 d_instantiate(dentry, inode);
 749         }
 750
 751 error:
 752         if (fid)
 753                 p9_client_clunk(fid);
 754
 755         return err;
 756 }
 757
 758 /**
 759  * v9fs_vfs_link_dotl - create a hardlink for dotl
 760  * @old_dentry: dentry for file to link to
 761  * @dir: inode destination for new link
 762  * @dentry: dentry for link
 763  *
 764  */
 765
 766 static int
 767 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 768                 struct dentry *dentry)
 769 {
 770         int err;
 771         char *name;
 772         struct dentry *dir_dentry;
 773         struct p9_fid *dfid, *oldfid;
 774         struct v9fs_session_info *v9ses;
 775
 776         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
 777                  dir->i_ino, old_dentry->d_name.name, dentry->d_name.name);
 778
 779         v9ses = v9fs_inode2v9ses(dir);
 780         dir_dentry = dentry->d_parent;
 781         dfid = v9fs_fid_lookup(dir_dentry);
 782         if (IS_ERR(dfid))
 783                 return PTR_ERR(dfid);
 784
 785         oldfid = v9fs_fid_lookup(old_dentry);
 786         if (IS_ERR(oldfid))
 787                 return PTR_ERR(oldfid);
 788
 789         name = (char *) dentry->d_name.name;
 790
 791         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 792
 793         if (err < 0) {
 794                 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 795                 return err;
 796         }
 797
 798         v9fs_invalidate_inode_attr(dir);
 799         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 800                 /* Get the latest stat info from server. */
 801                 struct p9_fid *fid;
 802                 fid = v9fs_fid_lookup(old_dentry);
 803                 if (IS_ERR(fid))
 804                         return PTR_ERR(fid);
 805
 806                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
 807         }
 808         ihold(old_dentry->d_inode);
 809         d_instantiate(dentry, old_dentry->d_inode);
 810
 811         return err;
 812 }
 813
 814 /**
 815  * v9fs_vfs_mknod_dotl - create a special file
 816  * @dir: inode destination for new link
 817  * @dentry: dentry for file
 818  * @mode: mode for creation
 819  * @rdev: device associated with special file
 820  *
 821  */
 822 static int
 823 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 824                 dev_t rdev)
 825 {
 826         int err;
 827         kgid_t gid;
 828         char *name;
 829         umode_t mode;
 830         struct v9fs_session_info *v9ses;
 831         struct p9_fid *fid = NULL, *dfid = NULL;
 832         struct inode *inode;
 833         struct p9_qid qid;
 834         struct dentry *dir_dentry;
 835         struct posix_acl *dacl = NULL, *pacl = NULL;
 836
 837         p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
 838                  dir->i_ino, dentry->d_name.name, omode,
 839                  MAJOR(rdev), MINOR(rdev));
 840
 841         if (!new_valid_dev(rdev))
 842                 return -EINVAL;
 843
 844         v9ses = v9fs_inode2v9ses(dir);
 845         dir_dentry = dentry->d_parent;
 846         dfid = v9fs_fid_lookup(dir_dentry);
 847         if (IS_ERR(dfid)) {
 848                 err = PTR_ERR(dfid);
 849                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 850                 dfid = NULL;
 851                 goto error;
 852         }
 853
 854         gid = v9fs_get_fsgid_for_create(dir);
 855         mode = omode;
 856         /* Update mode based on ACL value */
 857         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 858         if (err) {
 859                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 860                          err);
 861                 goto error;
 862         }
 863         name = (char *) dentry->d_name.name;
 864
 865         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 866         if (err < 0)
 867                 goto error;
 868
 869         v9fs_invalidate_inode_attr(dir);
 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         /* instantiate inode and assign the unopened fid to the dentry */
 880         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 881                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 882                 if (IS_ERR(inode)) {
 883                         err = PTR_ERR(inode);
 884                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 885                                  err);
 886                         goto error;
 887                 }
 888                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 889                 v9fs_fid_add(dentry, fid);
 890                 d_instantiate(dentry, inode);
 891                 fid = NULL;
 892                 err = 0;
 893         } else {
 894                 /*
 895                  * Not in cached mode. No need to populate inode with stat.
 896                  * socket syscall returns a fd, so we need instantiate
 897                  */
 898                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 899                 if (IS_ERR(inode)) {
 900                         err = PTR_ERR(inode);
 901                         goto error;
 902                 }
 903                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 904                 d_instantiate(dentry, inode);
 905         }
 906 error:
 907         if (fid)
 908                 p9_client_clunk(fid);
 909         v9fs_put_acl(dacl, pacl);
 910         return err;
 911 }
 912
 913 /**
 914  * v9fs_vfs_follow_link_dotl - follow a symlink path
 915  * @dentry: dentry for symlink
 916  * @nd: nameidata
 917  *
 918  */
 919
 920 static void *
 921 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
 922 {
 923         int retval;
 924         struct p9_fid *fid;
 925         char *link = __getname();
 926         char *target;
 927
 928         p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
 929
 930         if (!link) {
 931                 link = ERR_PTR(-ENOMEM);
 932                 goto ndset;
 933         }
 934         fid = v9fs_fid_lookup(dentry);
 935         if (IS_ERR(fid)) {
 936                 __putname(link);
 937                 link = ERR_CAST(fid);
 938                 goto ndset;
 939         }
 940         retval = p9_client_readlink(fid, &target);
 941         if (!retval) {
 942                 strcpy(link, target);
 943                 kfree(target);
 944                 goto ndset;
 945         }
 946         __putname(link);
 947         link = ERR_PTR(retval);
 948 ndset:
 949         nd_set_link(nd, link);
 950         return NULL;
 951 }
 952
 953 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 954 {
 955         loff_t i_size;
 956         struct p9_stat_dotl *st;
 957         struct v9fs_session_info *v9ses;
 958
 959         v9ses = v9fs_inode2v9ses(inode);
 960         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 961         if (IS_ERR(st))
 962                 return PTR_ERR(st);
 963         /*
 964          * Don't update inode if the file type is different
 965          */
 966         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 967                 goto out;
 968
 969         spin_lock(&inode->i_lock);
 970         /*
 971          * We don't want to refresh inode->i_size,
 972          * because we may have cached data
 973          */
 974         i_size = inode->i_size;
 975         v9fs_stat2inode_dotl(st, inode);
 976         if (v9ses->cache)
 977                 inode->i_size = i_size;
 978         spin_unlock(&inode->i_lock);
 979 out:
 980         kfree(st);
 981         return 0;
 982 }
 983
 984 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 985         .create = v9fs_vfs_create_dotl,
 986         .atomic_open = v9fs_vfs_atomic_open_dotl,
 987         .lookup = v9fs_vfs_lookup,
 988         .link = v9fs_vfs_link_dotl,
 989         .symlink = v9fs_vfs_symlink_dotl,
 990         .unlink = v9fs_vfs_unlink,
 991         .mkdir = v9fs_vfs_mkdir_dotl,
 992         .rmdir = v9fs_vfs_rmdir,
 993         .mknod = v9fs_vfs_mknod_dotl,
 994         .rename = v9fs_vfs_rename,
 995         .getattr = v9fs_vfs_getattr_dotl,
 996         .setattr = v9fs_vfs_setattr_dotl,
 997         .setxattr = generic_setxattr,
 998         .getxattr = generic_getxattr,
 999         .removexattr = generic_removexattr,
1000         .listxattr = v9fs_listxattr,
1001         .get_acl = v9fs_iop_get_acl,
1002 };
1003
1004 const struct inode_operations v9fs_file_inode_operations_dotl = {
1005         .getattr = v9fs_vfs_getattr_dotl,
1006         .setattr = v9fs_vfs_setattr_dotl,
1007         .setxattr = generic_setxattr,
1008         .getxattr = generic_getxattr,
1009         .removexattr = generic_removexattr,
1010         .listxattr = v9fs_listxattr,
1011         .get_acl = v9fs_iop_get_acl,
1012 };
1013
1014 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1015         .readlink = generic_readlink,
1016         .follow_link = v9fs_vfs_follow_link_dotl,
1017         .put_link = v9fs_vfs_put_link,
1018         .getattr = v9fs_vfs_getattr_dotl,
1019         .setattr = v9fs_vfs_setattr_dotl,
1020         .setxattr = generic_setxattr,
1021         .getxattr = generic_getxattr,
1022         .removexattr = generic_removexattr,
1023         .listxattr = v9fs_listxattr,
1024 };