fs/9p/vfs_inode_dotl.c

   1 /*
   2  *  linux/fs/9p/vfs_inode_dotl.c
   3  *
   4  * This file contains vfs inode ops for the 9P2000.L protocol.
   5  *
   6  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   7  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2
  11  *  as published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to:
  20  *  Free Software Foundation
  21  *  51 Franklin Street, Fifth Floor
  22  *  Boston, MA  02111-1301  USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/errno.h>
  28 #include <linux/fs.h>
  29 #include <linux/file.h>
  30 #include <linux/pagemap.h>
  31 #include <linux/stat.h>
  32 #include <linux/string.h>
  33 #include <linux/inet.h>
  34 #include <linux/namei.h>
  35 #include <linux/idr.h>
  36 #include <linux/sched.h>
  37 #include <linux/slab.h>
  38 #include <linux/xattr.h>
  39 #include <linux/posix_acl.h>
  40 #include <net/9p/9p.h>
  41 #include <net/9p/client.h>
  42
  43 #include "v9fs.h"
  44 #include "v9fs_vfs.h"
  45 #include "fid.h"
  46 #include "cache.h"
  47 #include "xattr.h"
  48 #include "acl.h"
  49
  50 static int
  51 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
  52                     dev_t rdev);
  53
  54 /**
  55  * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
  56  * new file system object. This checks the S_ISGID to determine the owning
  57  * group of the new file system object.
  58  */
  59
  60 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
  61 {
  62         BUG_ON(dir_inode == NULL);
  63
  64         if (dir_inode->i_mode & S_ISGID) {
  65                 /* set_gid bit is set.*/
  66                 return dir_inode->i_gid;
  67         }
  68         return current_fsgid();
  69 }
  70
  71 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
  72 {
  73         struct v9fs_inode *v9inode = V9FS_I(inode);
  74         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
  75
  76         /* don't match inode of different type */
  77         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
  78                 return 0;
  79
  80         if (inode->i_generation != st->st_gen)
  81                 return 0;
  82
  83         /* compare qid details */
  84         if (memcmp(&v9inode->qid.version,
  85                    &st->qid.version, sizeof(v9inode->qid.version)))
  86                 return 0;
  87
  88         if (v9inode->qid.type != st->qid.type)
  89                 return 0;
  90         return 1;
  91 }
  92
  93 /* Always get a new inode */
  94 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
  95 {
  96         return 0;
  97 }
  98
  99 static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
 100 {
 101         struct v9fs_inode *v9inode = V9FS_I(inode);
 102         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
 103
 104         memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
 105         inode->i_generation = st->st_gen;
 106         return 0;
 107 }
 108
 109 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
 110                                         struct p9_qid *qid,
 111                                         struct p9_fid *fid,
 112                                         struct p9_stat_dotl *st,
 113                                         int new)
 114 {
 115         int retval;
 116         unsigned long i_ino;
 117         struct inode *inode;
 118         struct v9fs_session_info *v9ses = sb->s_fs_info;
 119         int (*test)(struct inode *, void *);
 120
 121         if (new)
 122                 test = v9fs_test_new_inode_dotl;
 123         else
 124                 test = v9fs_test_inode_dotl;
 125
 126         i_ino = v9fs_qid2ino(qid);
 127         inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
 128         if (!inode)
 129                 return ERR_PTR(-ENOMEM);
 130         if (!(inode->i_state & I_NEW))
 131                 return inode;
 132         /*
 133          * initialize the inode with the stat info
 134          * FIXME!! we may need support for stale inodes
 135          * later.
 136          */
 137         inode->i_ino = i_ino;
 138         retval = v9fs_init_inode(v9ses, inode,
 139                                  st->st_mode, new_decode_dev(st->st_rdev));
 140         if (retval)
 141                 goto error;
 142
 143         v9fs_stat2inode_dotl(st, inode);
 144         v9fs_cache_inode_get_cookie(inode);
 145         retval = v9fs_get_acl(inode, fid);
 146         if (retval)
 147                 goto error;
 148
 149         unlock_new_inode(inode);
 150         return inode;
 151 error:
 152         iget_failed(inode);
 153         return ERR_PTR(retval);
 154
 155 }
 156
 157 struct inode *
 158 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 159                          struct super_block *sb, int new)
 160 {
 161         struct p9_stat_dotl *st;
 162         struct inode *inode = NULL;
 163
 164         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
 165         if (IS_ERR(st))
 166                 return ERR_CAST(st);
 167
 168         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
 169         kfree(st);
 170         return inode;
 171 }
 172
 173 struct dotl_openflag_map {
 174         int open_flag;
 175         int dotl_flag;
 176 };
 177
 178 static int v9fs_mapped_dotl_flags(int flags)
 179 {
 180         int i;
 181         int rflags = 0;
 182         struct dotl_openflag_map dotl_oflag_map[] = {
 183                 { O_CREAT,      P9_DOTL_CREATE },
 184                 { O_EXCL,       P9_DOTL_EXCL },
 185                 { O_NOCTTY,     P9_DOTL_NOCTTY },
 186                 { O_APPEND,     P9_DOTL_APPEND },
 187                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
 188                 { O_DSYNC,      P9_DOTL_DSYNC },
 189                 { FASYNC,       P9_DOTL_FASYNC },
 190                 { O_DIRECT,     P9_DOTL_DIRECT },
 191                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
 192                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
 193                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
 194                 { O_NOATIME,    P9_DOTL_NOATIME },
 195                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
 196                 { O_SYNC,       P9_DOTL_SYNC},
 197         };
 198         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
 199                 if (flags & dotl_oflag_map[i].open_flag)
 200                         rflags |= dotl_oflag_map[i].dotl_flag;
 201         }
 202         return rflags;
 203 }
 204
 205 /**
 206  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 207  * plan 9 open flag.
 208  * @flags: flags to convert
 209  */
 210 int v9fs_open_to_dotl_flags(int flags)
 211 {
 212         int rflags = 0;
 213
 214         /*
 215          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
 216          * and P9_DOTL_NOACCESS
 217          */
 218         rflags |= flags & O_ACCMODE;
 219         rflags |= v9fs_mapped_dotl_flags(flags);
 220
 221         return rflags;
 222 }
 223
 224 /**
 225  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 226  * @dir: directory inode that is being created
 227  * @dentry:  dentry that is being deleted
 228  * @omode: create permissions
 229  *
 230  */
 231
 232 static int
 233 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 234                 bool excl)
 235 {
 236         return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 237 }
 238
 239 static int
 240 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 241                           struct file *file, unsigned flags, umode_t omode,
 242                           int *opened)
 243 {
 244         int err = 0;
 245         kgid_t gid;
 246         umode_t mode;
 247         char *name = NULL;
 248         struct p9_qid qid;
 249         struct inode *inode;
 250         struct p9_fid *fid = NULL;
 251         struct v9fs_inode *v9inode;
 252         struct p9_fid *dfid, *ofid, *inode_fid;
 253         struct v9fs_session_info *v9ses;
 254         struct posix_acl *pacl = NULL, *dacl = NULL;
 255         struct dentry *res = NULL;
 256
 257         if (d_in_lookup(dentry)) {
 258                 res = v9fs_vfs_lookup(dir, dentry, 0);
 259                 if (IS_ERR(res))
 260                         return PTR_ERR(res);
 261
 262                 if (res)
 263                         dentry = res;
 264         }
 265
 266         /* Only creates */
 267         if (!(flags & O_CREAT) || d_really_is_positive(dentry))
 268                 return  finish_no_open(file, res);
 269
 270         v9ses = v9fs_inode2v9ses(dir);
 271
 272         name = (char *) dentry->d_name.name;
 273         p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
 274                  name, flags, omode);
 275
 276         dfid = v9fs_parent_fid(dentry);
 277         if (IS_ERR(dfid)) {
 278                 err = PTR_ERR(dfid);
 279                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 280                 goto out;
 281         }
 282
 283         /* clone a fid to use for creation */
 284         ofid = clone_fid(dfid);
 285         if (IS_ERR(ofid)) {
 286                 err = PTR_ERR(ofid);
 287                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 288                 goto out;
 289         }
 290
 291         gid = v9fs_get_fsgid_for_create(dir);
 292
 293         mode = omode;
 294         /* Update mode based on ACL value */
 295         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 296         if (err) {
 297                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
 298                          err);
 299                 goto error;
 300         }
 301         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
 302                                     mode, gid, &qid);
 303         if (err < 0) {
 304                 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
 305                          err);
 306                 goto error;
 307         }
 308         v9fs_invalidate_inode_attr(dir);
 309
 310         /* instantiate inode and assign the unopened fid to the dentry */
 311         fid = p9_client_walk(dfid, 1, &name, 1);
 312         if (IS_ERR(fid)) {
 313                 err = PTR_ERR(fid);
 314                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 315                 fid = NULL;
 316                 goto error;
 317         }
 318         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 319         if (IS_ERR(inode)) {
 320                 err = PTR_ERR(inode);
 321                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 322                 goto error;
 323         }
 324         /* Now set the ACL based on the default value */
 325         v9fs_set_create_acl(inode, fid, dacl, pacl);
 326
 327         v9fs_fid_add(dentry, fid);
 328         d_instantiate(dentry, inode);
 329
 330         v9inode = V9FS_I(inode);
 331         mutex_lock(&v9inode->v_mutex);
 332         if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
 333             !v9inode->writeback_fid &&
 334             ((flags & O_ACCMODE) != O_RDONLY)) {
 335                 /*
 336                  * clone a fid and add it to writeback_fid
 337                  * we do it during open time instead of
 338                  * page dirty time via write_begin/page_mkwrite
 339                  * because we want write after unlink usecase
 340                  * to work.
 341                  */
 342                 inode_fid = v9fs_writeback_fid(dentry);
 343                 if (IS_ERR(inode_fid)) {
 344                         err = PTR_ERR(inode_fid);
 345                         mutex_unlock(&v9inode->v_mutex);
 346                         goto err_clunk_old_fid;
 347                 }
 348                 v9inode->writeback_fid = (void *) inode_fid;
 349         }
 350         mutex_unlock(&v9inode->v_mutex);
 351         /* Since we are opening a file, assign the open fid to the file */
 352         err = finish_open(file, dentry, generic_file_open, opened);
 353         if (err)
 354                 goto err_clunk_old_fid;
 355         file->private_data = ofid;
 356         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
 357                 v9fs_cache_inode_set_cookie(inode, file);
 358         *opened |= FILE_CREATED;
 359 out:
 360         v9fs_put_acl(dacl, pacl);
 361         dput(res);
 362         return err;
 363
 364 error:
 365         if (fid)
 366                 p9_client_clunk(fid);
 367 err_clunk_old_fid:
 368         if (ofid)
 369                 p9_client_clunk(ofid);
 370         goto out;
 371 }
 372
 373 /**
 374  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 375  * @dir:  inode that is being unlinked
 376  * @dentry: dentry that is being unlinked
 377  * @omode: mode for new directory
 378  *
 379  */
 380
 381 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 382                                struct dentry *dentry, umode_t omode)
 383 {
 384         int err;
 385         struct v9fs_session_info *v9ses;
 386         struct p9_fid *fid = NULL, *dfid = NULL;
 387         kgid_t gid;
 388         char *name;
 389         umode_t mode;
 390         struct inode *inode;
 391         struct p9_qid qid;
 392         struct posix_acl *dacl = NULL, *pacl = NULL;
 393
 394         p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
 395         err = 0;
 396         v9ses = v9fs_inode2v9ses(dir);
 397
 398         omode |= S_IFDIR;
 399         if (dir->i_mode & S_ISGID)
 400                 omode |= S_ISGID;
 401
 402         dfid = v9fs_parent_fid(dentry);
 403         if (IS_ERR(dfid)) {
 404                 err = PTR_ERR(dfid);
 405                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 406                 dfid = NULL;
 407                 goto error;
 408         }
 409
 410         gid = v9fs_get_fsgid_for_create(dir);
 411         mode = omode;
 412         /* Update mode based on ACL value */
 413         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 414         if (err) {
 415                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 416                          err);
 417                 goto error;
 418         }
 419         name = (char *) dentry->d_name.name;
 420         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 421         if (err < 0)
 422                 goto error;
 423
 424         fid = p9_client_walk(dfid, 1, &name, 1);
 425         if (IS_ERR(fid)) {
 426                 err = PTR_ERR(fid);
 427                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 428                          err);
 429                 fid = NULL;
 430                 goto error;
 431         }
 432
 433         /* instantiate inode and assign the unopened fid to the dentry */
 434         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 435                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 436                 if (IS_ERR(inode)) {
 437                         err = PTR_ERR(inode);
 438                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 439                                  err);
 440                         goto error;
 441                 }
 442                 v9fs_fid_add(dentry, fid);
 443                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 444                 d_instantiate(dentry, inode);
 445                 fid = NULL;
 446                 err = 0;
 447         } else {
 448                 /*
 449                  * Not in cached mode. No need to populate
 450                  * inode with stat. We need to get an inode
 451                  * so that we can set the acl with dentry
 452                  */
 453                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 454                 if (IS_ERR(inode)) {
 455                         err = PTR_ERR(inode);
 456                         goto error;
 457                 }
 458                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 459                 d_instantiate(dentry, inode);
 460         }
 461         inc_nlink(dir);
 462         v9fs_invalidate_inode_attr(dir);
 463 error:
 464         if (fid)
 465                 p9_client_clunk(fid);
 466         v9fs_put_acl(dacl, pacl);
 467         return err;
 468 }
 469
 470 static int
 471 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 472                  struct kstat *stat)
 473 {
 474         struct v9fs_session_info *v9ses;
 475         struct p9_fid *fid;
 476         struct p9_stat_dotl *st;
 477
 478         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 479         v9ses = v9fs_dentry2v9ses(dentry);
 480         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 481                 generic_fillattr(d_inode(dentry), stat);
 482                 return 0;
 483         }
 484         fid = v9fs_fid_lookup(dentry);
 485         if (IS_ERR(fid))
 486                 return PTR_ERR(fid);
 487
 488         /* Ask for all the fields in stat structure. Server will return
 489          * whatever it supports
 490          */
 491
 492         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 493         if (IS_ERR(st))
 494                 return PTR_ERR(st);
 495
 496         v9fs_stat2inode_dotl(st, d_inode(dentry));
 497         generic_fillattr(d_inode(dentry), stat);
 498         /* Change block size to what the server returned */
 499         stat->blksize = st->st_blksize;
 500
 501         kfree(st);
 502         return 0;
 503 }
 504
 505 /*
 506  * Attribute flags.
 507  */
 508 #define P9_ATTR_MODE            (1 << 0)
 509 #define P9_ATTR_UID             (1 << 1)
 510 #define P9_ATTR_GID             (1 << 2)
 511 #define P9_ATTR_SIZE            (1 << 3)
 512 #define P9_ATTR_ATIME           (1 << 4)
 513 #define P9_ATTR_MTIME           (1 << 5)
 514 #define P9_ATTR_CTIME           (1 << 6)
 515 #define P9_ATTR_ATIME_SET       (1 << 7)
 516 #define P9_ATTR_MTIME_SET       (1 << 8)
 517
 518 struct dotl_iattr_map {
 519         int iattr_valid;
 520         int p9_iattr_valid;
 521 };
 522
 523 static int v9fs_mapped_iattr_valid(int iattr_valid)
 524 {
 525         int i;
 526         int p9_iattr_valid = 0;
 527         struct dotl_iattr_map dotl_iattr_map[] = {
 528                 { ATTR_MODE,            P9_ATTR_MODE },
 529                 { ATTR_UID,             P9_ATTR_UID },
 530                 { ATTR_GID,             P9_ATTR_GID },
 531                 { ATTR_SIZE,            P9_ATTR_SIZE },
 532                 { ATTR_ATIME,           P9_ATTR_ATIME },
 533                 { ATTR_MTIME,           P9_ATTR_MTIME },
 534                 { ATTR_CTIME,           P9_ATTR_CTIME },
 535                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 536                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 537         };
 538         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 539                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 540                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 541         }
 542         return p9_iattr_valid;
 543 }
 544
 545 /**
 546  * v9fs_vfs_setattr_dotl - set file metadata
 547  * @dentry: file whose metadata to set
 548  * @iattr: metadata assignment structure
 549  *
 550  */
 551
 552 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 553 {
 554         int retval;
 555         struct p9_fid *fid;
 556         struct p9_iattr_dotl p9attr;
 557         struct inode *inode = d_inode(dentry);
 558
 559         p9_debug(P9_DEBUG_VFS, "\n");
 560
 561         retval = inode_change_ok(inode, iattr);
 562         if (retval)
 563                 return retval;
 564
 565         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 566         p9attr.mode = iattr->ia_mode;
 567         p9attr.uid = iattr->ia_uid;
 568         p9attr.gid = iattr->ia_gid;
 569         p9attr.size = iattr->ia_size;
 570         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 571         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 572         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 573         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 574
 575         fid = v9fs_fid_lookup(dentry);
 576         if (IS_ERR(fid))
 577                 return PTR_ERR(fid);
 578
 579         /* Write all dirty data */
 580         if (S_ISREG(inode->i_mode))
 581                 filemap_write_and_wait(inode->i_mapping);
 582
 583         retval = p9_client_setattr(fid, &p9attr);
 584         if (retval < 0)
 585                 return retval;
 586
 587         if ((iattr->ia_valid & ATTR_SIZE) &&
 588             iattr->ia_size != i_size_read(inode))
 589                 truncate_setsize(inode, iattr->ia_size);
 590
 591         v9fs_invalidate_inode_attr(inode);
 592         setattr_copy(inode, iattr);
 593         mark_inode_dirty(inode);
 594         if (iattr->ia_valid & ATTR_MODE) {
 595                 /* We also want to update ACL when we update mode bits */
 596                 retval = v9fs_acl_chmod(inode, fid);
 597                 if (retval < 0)
 598                         return retval;
 599         }
 600         return 0;
 601 }
 602
 603 /**
 604  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 605  * @stat: stat structure
 606  * @inode: inode to populate
 607  *
 608  */
 609
 610 void
 611 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 612 {
 613         umode_t mode;
 614         struct v9fs_inode *v9inode = V9FS_I(inode);
 615
 616         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 617                 inode->i_atime.tv_sec = stat->st_atime_sec;
 618                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 619                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 620                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 621                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 622                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 623                 inode->i_uid = stat->st_uid;
 624                 inode->i_gid = stat->st_gid;
 625                 set_nlink(inode, stat->st_nlink);
 626
 627                 mode = stat->st_mode & S_IALLUGO;
 628                 mode |= inode->i_mode & ~S_IALLUGO;
 629                 inode->i_mode = mode;
 630
 631                 i_size_write(inode, stat->st_size);
 632                 inode->i_blocks = stat->st_blocks;
 633         } else {
 634                 if (stat->st_result_mask & P9_STATS_ATIME) {
 635                         inode->i_atime.tv_sec = stat->st_atime_sec;
 636                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 637                 }
 638                 if (stat->st_result_mask & P9_STATS_MTIME) {
 639                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 640                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 641                 }
 642                 if (stat->st_result_mask & P9_STATS_CTIME) {
 643                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 644                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 645                 }
 646                 if (stat->st_result_mask & P9_STATS_UID)
 647                         inode->i_uid = stat->st_uid;
 648                 if (stat->st_result_mask & P9_STATS_GID)
 649                         inode->i_gid = stat->st_gid;
 650                 if (stat->st_result_mask & P9_STATS_NLINK)
 651                         set_nlink(inode, stat->st_nlink);
 652                 if (stat->st_result_mask & P9_STATS_MODE) {
 653                         inode->i_mode = stat->st_mode;
 654                         if ((S_ISBLK(inode->i_mode)) ||
 655                                                 (S_ISCHR(inode->i_mode)))
 656                                 init_special_inode(inode, inode->i_mode,
 657                                                                 inode->i_rdev);
 658                 }
 659                 if (stat->st_result_mask & P9_STATS_RDEV)
 660                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 661                 if (stat->st_result_mask & P9_STATS_SIZE)
 662                         i_size_write(inode, stat->st_size);
 663                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 664                         inode->i_blocks = stat->st_blocks;
 665         }
 666         if (stat->st_result_mask & P9_STATS_GEN)
 667                 inode->i_generation = stat->st_gen;
 668
 669         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 670          * because the inode structure does not have fields for them.
 671          */
 672         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 673 }
 674
 675 static int
 676 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 677                 const char *symname)
 678 {
 679         int err;
 680         kgid_t gid;
 681         char *name;
 682         struct p9_qid qid;
 683         struct inode *inode;
 684         struct p9_fid *dfid;
 685         struct p9_fid *fid = NULL;
 686         struct v9fs_session_info *v9ses;
 687
 688         name = (char *) dentry->d_name.name;
 689         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 690         v9ses = v9fs_inode2v9ses(dir);
 691
 692         dfid = v9fs_parent_fid(dentry);
 693         if (IS_ERR(dfid)) {
 694                 err = PTR_ERR(dfid);
 695                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 696                 return err;
 697         }
 698
 699         gid = v9fs_get_fsgid_for_create(dir);
 700
 701         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 702         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 703
 704         if (err < 0) {
 705                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 706                 goto error;
 707         }
 708
 709         v9fs_invalidate_inode_attr(dir);
 710         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 711                 /* Now walk from the parent so we can get an unopened fid. */
 712                 fid = p9_client_walk(dfid, 1, &name, 1);
 713                 if (IS_ERR(fid)) {
 714                         err = PTR_ERR(fid);
 715                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 716                                  err);
 717                         fid = NULL;
 718                         goto error;
 719                 }
 720
 721                 /* instantiate inode and assign the unopened fid to dentry */
 722                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 723                 if (IS_ERR(inode)) {
 724                         err = PTR_ERR(inode);
 725                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 726                                  err);
 727                         goto error;
 728                 }
 729                 v9fs_fid_add(dentry, fid);
 730                 d_instantiate(dentry, inode);
 731                 fid = NULL;
 732                 err = 0;
 733         } else {
 734                 /* Not in cached mode. No need to populate inode with stat */
 735                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 736                 if (IS_ERR(inode)) {
 737                         err = PTR_ERR(inode);
 738                         goto error;
 739                 }
 740                 d_instantiate(dentry, inode);
 741         }
 742
 743 error:
 744         if (fid)
 745                 p9_client_clunk(fid);
 746
 747         return err;
 748 }
 749
 750 /**
 751  * v9fs_vfs_link_dotl - create a hardlink for dotl
 752  * @old_dentry: dentry for file to link to
 753  * @dir: inode destination for new link
 754  * @dentry: dentry for link
 755  *
 756  */
 757
 758 static int
 759 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 760                 struct dentry *dentry)
 761 {
 762         int err;
 763         struct p9_fid *dfid, *oldfid;
 764         struct v9fs_session_info *v9ses;
 765
 766         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
 767                  dir->i_ino, old_dentry, dentry);
 768
 769         v9ses = v9fs_inode2v9ses(dir);
 770         dfid = v9fs_parent_fid(dentry);
 771         if (IS_ERR(dfid))
 772                 return PTR_ERR(dfid);
 773
 774         oldfid = v9fs_fid_lookup(old_dentry);
 775         if (IS_ERR(oldfid))
 776                 return PTR_ERR(oldfid);
 777
 778         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 779
 780         if (err < 0) {
 781                 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 782                 return err;
 783         }
 784
 785         v9fs_invalidate_inode_attr(dir);
 786         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 787                 /* Get the latest stat info from server. */
 788                 struct p9_fid *fid;
 789                 fid = v9fs_fid_lookup(old_dentry);
 790                 if (IS_ERR(fid))
 791                         return PTR_ERR(fid);
 792
 793                 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
 794         }
 795         ihold(d_inode(old_dentry));
 796         d_instantiate(dentry, d_inode(old_dentry));
 797
 798         return err;
 799 }
 800
 801 /**
 802  * v9fs_vfs_mknod_dotl - create a special file
 803  * @dir: inode destination for new link
 804  * @dentry: dentry for file
 805  * @omode: mode for creation
 806  * @rdev: device associated with special file
 807  *
 808  */
 809 static int
 810 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 811                 dev_t rdev)
 812 {
 813         int err;
 814         kgid_t gid;
 815         char *name;
 816         umode_t mode;
 817         struct v9fs_session_info *v9ses;
 818         struct p9_fid *fid = NULL, *dfid = NULL;
 819         struct inode *inode;
 820         struct p9_qid qid;
 821         struct posix_acl *dacl = NULL, *pacl = NULL;
 822
 823         p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
 824                  dir->i_ino, dentry, omode,
 825                  MAJOR(rdev), MINOR(rdev));
 826
 827         v9ses = v9fs_inode2v9ses(dir);
 828         dfid = v9fs_parent_fid(dentry);
 829         if (IS_ERR(dfid)) {
 830                 err = PTR_ERR(dfid);
 831                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 832                 dfid = NULL;
 833                 goto error;
 834         }
 835
 836         gid = v9fs_get_fsgid_for_create(dir);
 837         mode = omode;
 838         /* Update mode based on ACL value */
 839         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 840         if (err) {
 841                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 842                          err);
 843                 goto error;
 844         }
 845         name = (char *) dentry->d_name.name;
 846
 847         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 848         if (err < 0)
 849                 goto error;
 850
 851         v9fs_invalidate_inode_attr(dir);
 852         fid = p9_client_walk(dfid, 1, &name, 1);
 853         if (IS_ERR(fid)) {
 854                 err = PTR_ERR(fid);
 855                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 856                          err);
 857                 fid = NULL;
 858                 goto error;
 859         }
 860
 861         /* instantiate inode and assign the unopened fid to the dentry */
 862         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 863                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 864                 if (IS_ERR(inode)) {
 865                         err = PTR_ERR(inode);
 866                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 867                                  err);
 868                         goto error;
 869                 }
 870                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 871                 v9fs_fid_add(dentry, fid);
 872                 d_instantiate(dentry, inode);
 873                 fid = NULL;
 874                 err = 0;
 875         } else {
 876                 /*
 877                  * Not in cached mode. No need to populate inode with stat.
 878                  * socket syscall returns a fd, so we need instantiate
 879                  */
 880                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 881                 if (IS_ERR(inode)) {
 882                         err = PTR_ERR(inode);
 883                         goto error;
 884                 }
 885                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 886                 d_instantiate(dentry, inode);
 887         }
 888 error:
 889         if (fid)
 890                 p9_client_clunk(fid);
 891         v9fs_put_acl(dacl, pacl);
 892         return err;
 893 }
 894
 895 /**
 896  * v9fs_vfs_get_link_dotl - follow a symlink path
 897  * @dentry: dentry for symlink
 898  * @inode: inode for symlink
 899  * @done: destructor for return value
 900  */
 901
 902 static const char *
 903 v9fs_vfs_get_link_dotl(struct dentry *dentry,
 904                        struct inode *inode,
 905                        struct delayed_call *done)
 906 {
 907         struct p9_fid *fid;
 908         char *target;
 909         int retval;
 910
 911         if (!dentry)
 912                 return ERR_PTR(-ECHILD);
 913
 914         p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
 915
 916         fid = v9fs_fid_lookup(dentry);
 917         if (IS_ERR(fid))
 918                 return ERR_CAST(fid);
 919         retval = p9_client_readlink(fid, &target);
 920         if (retval)
 921                 return ERR_PTR(retval);
 922         set_delayed_call(done, kfree_link, target);
 923         return target;
 924 }
 925
 926 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 927 {
 928         loff_t i_size;
 929         struct p9_stat_dotl *st;
 930         struct v9fs_session_info *v9ses;
 931
 932         v9ses = v9fs_inode2v9ses(inode);
 933         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 934         if (IS_ERR(st))
 935                 return PTR_ERR(st);
 936         /*
 937          * Don't update inode if the file type is different
 938          */
 939         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 940                 goto out;
 941
 942         spin_lock(&inode->i_lock);
 943         /*
 944          * We don't want to refresh inode->i_size,
 945          * because we may have cached data
 946          */
 947         i_size = inode->i_size;
 948         v9fs_stat2inode_dotl(st, inode);
 949         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
 950                 inode->i_size = i_size;
 951         spin_unlock(&inode->i_lock);
 952 out:
 953         kfree(st);
 954         return 0;
 955 }
 956
 957 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 958         .create = v9fs_vfs_create_dotl,
 959         .atomic_open = v9fs_vfs_atomic_open_dotl,
 960         .lookup = v9fs_vfs_lookup,
 961         .link = v9fs_vfs_link_dotl,
 962         .symlink = v9fs_vfs_symlink_dotl,
 963         .unlink = v9fs_vfs_unlink,
 964         .mkdir = v9fs_vfs_mkdir_dotl,
 965         .rmdir = v9fs_vfs_rmdir,
 966         .mknod = v9fs_vfs_mknod_dotl,
 967         .rename2 = v9fs_vfs_rename,
 968         .getattr = v9fs_vfs_getattr_dotl,
 969         .setattr = v9fs_vfs_setattr_dotl,
 970         .setxattr = generic_setxattr,
 971         .getxattr = generic_getxattr,
 972         .removexattr = generic_removexattr,
 973         .listxattr = v9fs_listxattr,
 974         .get_acl = v9fs_iop_get_acl,
 975 };
 976
 977 const struct inode_operations v9fs_file_inode_operations_dotl = {
 978         .getattr = v9fs_vfs_getattr_dotl,
 979         .setattr = v9fs_vfs_setattr_dotl,
 980         .setxattr = generic_setxattr,
 981         .getxattr = generic_getxattr,
 982         .removexattr = generic_removexattr,
 983         .listxattr = v9fs_listxattr,
 984         .get_acl = v9fs_iop_get_acl,
 985 };
 986
 987 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 988         .readlink = generic_readlink,
 989         .get_link = v9fs_vfs_get_link_dotl,
 990         .getattr = v9fs_vfs_getattr_dotl,
 991         .setattr = v9fs_vfs_setattr_dotl,
 992         .setxattr = generic_setxattr,
 993         .getxattr = generic_getxattr,
 994         .removexattr = generic_removexattr,
 995         .listxattr = v9fs_listxattr,
 996 };