fs/9p/vfs_inode_dotl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/fs/9p/vfs_inode_dotl.c
   4  *
   5  * This file contains vfs inode ops for the 9P2000.L protocol.
   6  *
   7  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   8  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/errno.h>
  13 #include <linux/fs.h>
  14 #include <linux/file.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/stat.h>
  17 #include <linux/string.h>
  18 #include <linux/inet.h>
  19 #include <linux/namei.h>
  20 #include <linux/idr.h>
  21 #include <linux/sched.h>
  22 #include <linux/slab.h>
  23 #include <linux/xattr.h>
  24 #include <linux/posix_acl.h>
  25 #include <net/9p/9p.h>
  26 #include <net/9p/client.h>
  27
  28 #include "v9fs.h"
  29 #include "v9fs_vfs.h"
  30 #include "fid.h"
  31 #include "cache.h"
  32 #include "xattr.h"
  33 #include "acl.h"
  34
  35 static int
  36 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
  37                     dev_t rdev);
  38
  39 /**
  40  * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
  41  * new file system object. This checks the S_ISGID to determine the owning
  42  * group of the new file system object.
  43  */
  44
  45 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
  46 {
  47         BUG_ON(dir_inode == NULL);
  48
  49         if (dir_inode->i_mode & S_ISGID) {
  50                 /* set_gid bit is set.*/
  51                 return dir_inode->i_gid;
  52         }
  53         return current_fsgid();
  54 }
  55
  56 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
  57 {
  58         struct v9fs_inode *v9inode = V9FS_I(inode);
  59         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
  60
  61         /* don't match inode of different type */
  62         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
  63                 return 0;
  64
  65         if (inode->i_generation != st->st_gen)
  66                 return 0;
  67
  68         /* compare qid details */
  69         if (memcmp(&v9inode->qid.version,
  70                    &st->qid.version, sizeof(v9inode->qid.version)))
  71                 return 0;
  72
  73         if (v9inode->qid.type != st->qid.type)
  74                 return 0;
  75
  76         if (v9inode->qid.path != st->qid.path)
  77                 return 0;
  78         return 1;
  79 }
  80
  81 /* Always get a new inode */
  82 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
  83 {
  84         return 0;
  85 }
  86
  87 static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
  88 {
  89         struct v9fs_inode *v9inode = V9FS_I(inode);
  90         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
  91
  92         memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
  93         inode->i_generation = st->st_gen;
  94         return 0;
  95 }
  96
  97 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
  98                                         struct p9_qid *qid,
  99                                         struct p9_fid *fid,
 100                                         struct p9_stat_dotl *st,
 101                                         int new)
 102 {
 103         int retval;
 104         unsigned long i_ino;
 105         struct inode *inode;
 106         struct v9fs_session_info *v9ses = sb->s_fs_info;
 107         int (*test)(struct inode *, void *);
 108
 109         if (new)
 110                 test = v9fs_test_new_inode_dotl;
 111         else
 112                 test = v9fs_test_inode_dotl;
 113
 114         i_ino = v9fs_qid2ino(qid);
 115         inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
 116         if (!inode)
 117                 return ERR_PTR(-ENOMEM);
 118         if (!(inode->i_state & I_NEW))
 119                 return inode;
 120         /*
 121          * initialize the inode with the stat info
 122          * FIXME!! we may need support for stale inodes
 123          * later.
 124          */
 125         inode->i_ino = i_ino;
 126         retval = v9fs_init_inode(v9ses, inode,
 127                                  st->st_mode, new_decode_dev(st->st_rdev));
 128         if (retval)
 129                 goto error;
 130
 131         v9fs_stat2inode_dotl(st, inode, 0);
 132         v9fs_cache_inode_get_cookie(inode);
 133         retval = v9fs_get_acl(inode, fid);
 134         if (retval)
 135                 goto error;
 136
 137         unlock_new_inode(inode);
 138         return inode;
 139 error:
 140         iget_failed(inode);
 141         return ERR_PTR(retval);
 142
 143 }
 144
 145 struct inode *
 146 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 147                          struct super_block *sb, int new)
 148 {
 149         struct p9_stat_dotl *st;
 150         struct inode *inode = NULL;
 151
 152         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
 153         if (IS_ERR(st))
 154                 return ERR_CAST(st);
 155
 156         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
 157         kfree(st);
 158         return inode;
 159 }
 160
 161 struct dotl_openflag_map {
 162         int open_flag;
 163         int dotl_flag;
 164 };
 165
 166 static int v9fs_mapped_dotl_flags(int flags)
 167 {
 168         int i;
 169         int rflags = 0;
 170         struct dotl_openflag_map dotl_oflag_map[] = {
 171                 { O_CREAT,      P9_DOTL_CREATE },
 172                 { O_EXCL,       P9_DOTL_EXCL },
 173                 { O_NOCTTY,     P9_DOTL_NOCTTY },
 174                 { O_APPEND,     P9_DOTL_APPEND },
 175                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
 176                 { O_DSYNC,      P9_DOTL_DSYNC },
 177                 { FASYNC,       P9_DOTL_FASYNC },
 178                 { O_DIRECT,     P9_DOTL_DIRECT },
 179                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
 180                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
 181                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
 182                 { O_NOATIME,    P9_DOTL_NOATIME },
 183                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
 184                 { O_SYNC,       P9_DOTL_SYNC},
 185         };
 186         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
 187                 if (flags & dotl_oflag_map[i].open_flag)
 188                         rflags |= dotl_oflag_map[i].dotl_flag;
 189         }
 190         return rflags;
 191 }
 192
 193 /**
 194  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 195  * plan 9 open flag.
 196  * @flags: flags to convert
 197  */
 198 int v9fs_open_to_dotl_flags(int flags)
 199 {
 200         int rflags = 0;
 201
 202         /*
 203          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
 204          * and P9_DOTL_NOACCESS
 205          */
 206         rflags |= flags & O_ACCMODE;
 207         rflags |= v9fs_mapped_dotl_flags(flags);
 208
 209         return rflags;
 210 }
 211
 212 /**
 213  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 214  * @dir: directory inode that is being created
 215  * @dentry:  dentry that is being deleted
 216  * @omode: create permissions
 217  *
 218  */
 219
 220 static int
 221 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 222                 bool excl)
 223 {
 224         return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 225 }
 226
 227 static int
 228 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 229                           struct file *file, unsigned flags, umode_t omode)
 230 {
 231         int err = 0;
 232         kgid_t gid;
 233         umode_t mode;
 234         const unsigned char *name = NULL;
 235         struct p9_qid qid;
 236         struct inode *inode;
 237         struct p9_fid *fid = NULL;
 238         struct v9fs_inode *v9inode;
 239         struct p9_fid *dfid, *ofid, *inode_fid;
 240         struct v9fs_session_info *v9ses;
 241         struct posix_acl *pacl = NULL, *dacl = NULL;
 242         struct dentry *res = NULL;
 243
 244         if (d_in_lookup(dentry)) {
 245                 res = v9fs_vfs_lookup(dir, dentry, 0);
 246                 if (IS_ERR(res))
 247                         return PTR_ERR(res);
 248
 249                 if (res)
 250                         dentry = res;
 251         }
 252
 253         /* Only creates */
 254         if (!(flags & O_CREAT) || d_really_is_positive(dentry))
 255                 return  finish_no_open(file, res);
 256
 257         v9ses = v9fs_inode2v9ses(dir);
 258
 259         name = dentry->d_name.name;
 260         p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
 261                  name, flags, omode);
 262
 263         dfid = v9fs_parent_fid(dentry);
 264         if (IS_ERR(dfid)) {
 265                 err = PTR_ERR(dfid);
 266                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 267                 goto out;
 268         }
 269
 270         /* clone a fid to use for creation */
 271         ofid = clone_fid(dfid);
 272         if (IS_ERR(ofid)) {
 273                 err = PTR_ERR(ofid);
 274                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 275                 goto out;
 276         }
 277
 278         gid = v9fs_get_fsgid_for_create(dir);
 279
 280         mode = omode;
 281         /* Update mode based on ACL value */
 282         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 283         if (err) {
 284                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
 285                          err);
 286                 goto error;
 287         }
 288         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
 289                                     mode, gid, &qid);
 290         if (err < 0) {
 291                 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
 292                          err);
 293                 goto error;
 294         }
 295         v9fs_invalidate_inode_attr(dir);
 296
 297         /* instantiate inode and assign the unopened fid to the dentry */
 298         fid = p9_client_walk(dfid, 1, &name, 1);
 299         p9_client_clunk(dfid);
 300         if (IS_ERR(fid)) {
 301                 err = PTR_ERR(fid);
 302                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 303                 fid = NULL;
 304                 goto error;
 305         }
 306         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 307         if (IS_ERR(inode)) {
 308                 err = PTR_ERR(inode);
 309                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 310                 goto error;
 311         }
 312         /* Now set the ACL based on the default value */
 313         v9fs_set_create_acl(inode, fid, dacl, pacl);
 314
 315         v9fs_fid_add(dentry, fid);
 316         d_instantiate(dentry, inode);
 317
 318         v9inode = V9FS_I(inode);
 319         mutex_lock(&v9inode->v_mutex);
 320         if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
 321             !v9inode->writeback_fid &&
 322             ((flags & O_ACCMODE) != O_RDONLY)) {
 323                 /*
 324                  * clone a fid and add it to writeback_fid
 325                  * we do it during open time instead of
 326                  * page dirty time via write_begin/page_mkwrite
 327                  * because we want write after unlink usecase
 328                  * to work.
 329                  */
 330                 inode_fid = v9fs_writeback_fid(dentry);
 331                 if (IS_ERR(inode_fid)) {
 332                         err = PTR_ERR(inode_fid);
 333                         mutex_unlock(&v9inode->v_mutex);
 334                         goto err_clunk_old_fid;
 335                 }
 336                 v9inode->writeback_fid = (void *) inode_fid;
 337         }
 338         mutex_unlock(&v9inode->v_mutex);
 339         /* Since we are opening a file, assign the open fid to the file */
 340         err = finish_open(file, dentry, generic_file_open);
 341         if (err)
 342                 goto err_clunk_old_fid;
 343         file->private_data = ofid;
 344         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
 345                 v9fs_cache_inode_set_cookie(inode, file);
 346         v9fs_open_fid_add(inode, ofid);
 347         file->f_mode |= FMODE_CREATED;
 348 out:
 349         v9fs_put_acl(dacl, pacl);
 350         dput(res);
 351         return err;
 352
 353 error:
 354         if (fid)
 355                 p9_client_clunk(fid);
 356 err_clunk_old_fid:
 357         if (ofid)
 358                 p9_client_clunk(ofid);
 359         goto out;
 360 }
 361
 362 /**
 363  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 364  * @dir:  inode that is being unlinked
 365  * @dentry: dentry that is being unlinked
 366  * @omode: mode for new directory
 367  *
 368  */
 369
 370 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 371                                struct dentry *dentry, umode_t omode)
 372 {
 373         int err;
 374         struct v9fs_session_info *v9ses;
 375         struct p9_fid *fid = NULL, *dfid = NULL;
 376         kgid_t gid;
 377         const unsigned char *name;
 378         umode_t mode;
 379         struct inode *inode;
 380         struct p9_qid qid;
 381         struct posix_acl *dacl = NULL, *pacl = NULL;
 382
 383         p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
 384         err = 0;
 385         v9ses = v9fs_inode2v9ses(dir);
 386
 387         omode |= S_IFDIR;
 388         if (dir->i_mode & S_ISGID)
 389                 omode |= S_ISGID;
 390
 391         dfid = v9fs_parent_fid(dentry);
 392         if (IS_ERR(dfid)) {
 393                 err = PTR_ERR(dfid);
 394                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 395                 dfid = NULL;
 396                 goto error;
 397         }
 398
 399         gid = v9fs_get_fsgid_for_create(dir);
 400         mode = omode;
 401         /* Update mode based on ACL value */
 402         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 403         if (err) {
 404                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 405                          err);
 406                 goto error;
 407         }
 408         name = dentry->d_name.name;
 409         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 410         if (err < 0)
 411                 goto error;
 412         fid = p9_client_walk(dfid, 1, &name, 1);
 413         if (IS_ERR(fid)) {
 414                 err = PTR_ERR(fid);
 415                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 416                          err);
 417                 fid = NULL;
 418                 goto error;
 419         }
 420
 421         /* instantiate inode and assign the unopened fid to the dentry */
 422         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 423                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 424                 if (IS_ERR(inode)) {
 425                         err = PTR_ERR(inode);
 426                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 427                                  err);
 428                         goto error;
 429                 }
 430                 v9fs_fid_add(dentry, fid);
 431                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 432                 d_instantiate(dentry, inode);
 433                 fid = NULL;
 434                 err = 0;
 435         } else {
 436                 /*
 437                  * Not in cached mode. No need to populate
 438                  * inode with stat. We need to get an inode
 439                  * so that we can set the acl with dentry
 440                  */
 441                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 442                 if (IS_ERR(inode)) {
 443                         err = PTR_ERR(inode);
 444                         goto error;
 445                 }
 446                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 447                 d_instantiate(dentry, inode);
 448         }
 449         inc_nlink(dir);
 450         v9fs_invalidate_inode_attr(dir);
 451 error:
 452         if (fid)
 453                 p9_client_clunk(fid);
 454         v9fs_put_acl(dacl, pacl);
 455         p9_client_clunk(dfid);
 456         return err;
 457 }
 458
 459 static int
 460 v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
 461                  u32 request_mask, unsigned int flags)
 462 {
 463         struct dentry *dentry = path->dentry;
 464         struct v9fs_session_info *v9ses;
 465         struct p9_fid *fid;
 466         struct p9_stat_dotl *st;
 467
 468         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 469         v9ses = v9fs_dentry2v9ses(dentry);
 470         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 471                 generic_fillattr(d_inode(dentry), stat);
 472                 return 0;
 473         }
 474         fid = v9fs_fid_lookup(dentry);
 475         if (IS_ERR(fid))
 476                 return PTR_ERR(fid);
 477
 478         /* Ask for all the fields in stat structure. Server will return
 479          * whatever it supports
 480          */
 481
 482         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 483         p9_client_clunk(fid);
 484         if (IS_ERR(st))
 485                 return PTR_ERR(st);
 486
 487         v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
 488         generic_fillattr(d_inode(dentry), stat);
 489         /* Change block size to what the server returned */
 490         stat->blksize = st->st_blksize;
 491
 492         kfree(st);
 493         return 0;
 494 }
 495
 496 /*
 497  * Attribute flags.
 498  */
 499 #define P9_ATTR_MODE            (1 << 0)
 500 #define P9_ATTR_UID             (1 << 1)
 501 #define P9_ATTR_GID             (1 << 2)
 502 #define P9_ATTR_SIZE            (1 << 3)
 503 #define P9_ATTR_ATIME           (1 << 4)
 504 #define P9_ATTR_MTIME           (1 << 5)
 505 #define P9_ATTR_CTIME           (1 << 6)
 506 #define P9_ATTR_ATIME_SET       (1 << 7)
 507 #define P9_ATTR_MTIME_SET       (1 << 8)
 508
 509 struct dotl_iattr_map {
 510         int iattr_valid;
 511         int p9_iattr_valid;
 512 };
 513
 514 static int v9fs_mapped_iattr_valid(int iattr_valid)
 515 {
 516         int i;
 517         int p9_iattr_valid = 0;
 518         struct dotl_iattr_map dotl_iattr_map[] = {
 519                 { ATTR_MODE,            P9_ATTR_MODE },
 520                 { ATTR_UID,             P9_ATTR_UID },
 521                 { ATTR_GID,             P9_ATTR_GID },
 522                 { ATTR_SIZE,            P9_ATTR_SIZE },
 523                 { ATTR_ATIME,           P9_ATTR_ATIME },
 524                 { ATTR_MTIME,           P9_ATTR_MTIME },
 525                 { ATTR_CTIME,           P9_ATTR_CTIME },
 526                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 527                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 528         };
 529         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 530                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 531                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 532         }
 533         return p9_iattr_valid;
 534 }
 535
 536 /**
 537  * v9fs_vfs_setattr_dotl - set file metadata
 538  * @dentry: file whose metadata to set
 539  * @iattr: metadata assignment structure
 540  *
 541  */
 542
 543 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 544 {
 545         int retval, use_dentry = 0;
 546         struct p9_fid *fid = NULL;
 547         struct p9_iattr_dotl p9attr;
 548         struct inode *inode = d_inode(dentry);
 549
 550         p9_debug(P9_DEBUG_VFS, "\n");
 551
 552         retval = setattr_prepare(dentry, iattr);
 553         if (retval)
 554                 return retval;
 555
 556         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 557         p9attr.mode = iattr->ia_mode;
 558         p9attr.uid = iattr->ia_uid;
 559         p9attr.gid = iattr->ia_gid;
 560         p9attr.size = iattr->ia_size;
 561         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 562         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 563         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 564         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 565
 566         if (iattr->ia_valid & ATTR_FILE) {
 567                 fid = iattr->ia_file->private_data;
 568                 WARN_ON(!fid);
 569         }
 570         if (!fid) {
 571                 fid = v9fs_fid_lookup(dentry);
 572                 use_dentry = 1;
 573         }
 574         if (IS_ERR(fid))
 575                 return PTR_ERR(fid);
 576
 577         /* Write all dirty data */
 578         if (S_ISREG(inode->i_mode))
 579                 filemap_write_and_wait(inode->i_mapping);
 580
 581         retval = p9_client_setattr(fid, &p9attr);
 582         if (retval < 0) {
 583                 if (use_dentry)
 584                         p9_client_clunk(fid);
 585                 return retval;
 586         }
 587
 588         if ((iattr->ia_valid & ATTR_SIZE) &&
 589             iattr->ia_size != i_size_read(inode))
 590                 truncate_setsize(inode, iattr->ia_size);
 591
 592         v9fs_invalidate_inode_attr(inode);
 593         setattr_copy(inode, iattr);
 594         mark_inode_dirty(inode);
 595         if (iattr->ia_valid & ATTR_MODE) {
 596                 /* We also want to update ACL when we update mode bits */
 597                 retval = v9fs_acl_chmod(inode, fid);
 598                 if (retval < 0) {
 599                         if (use_dentry)
 600                                 p9_client_clunk(fid);
 601                         return retval;
 602                 }
 603         }
 604         if (use_dentry)
 605                 p9_client_clunk(fid);
 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  * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
 615  *
 616  */
 617
 618 void
 619 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
 620                       unsigned int flags)
 621 {
 622         umode_t mode;
 623         struct v9fs_inode *v9inode = V9FS_I(inode);
 624
 625         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 626                 inode->i_atime.tv_sec = stat->st_atime_sec;
 627                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 628                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 629                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 630                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 631                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 632                 inode->i_uid = stat->st_uid;
 633                 inode->i_gid = stat->st_gid;
 634                 set_nlink(inode, stat->st_nlink);
 635
 636                 mode = stat->st_mode & S_IALLUGO;
 637                 mode |= inode->i_mode & ~S_IALLUGO;
 638                 inode->i_mode = mode;
 639
 640                 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
 641                         v9fs_i_size_write(inode, stat->st_size);
 642                 inode->i_blocks = stat->st_blocks;
 643         } else {
 644                 if (stat->st_result_mask & P9_STATS_ATIME) {
 645                         inode->i_atime.tv_sec = stat->st_atime_sec;
 646                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 647                 }
 648                 if (stat->st_result_mask & P9_STATS_MTIME) {
 649                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 650                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 651                 }
 652                 if (stat->st_result_mask & P9_STATS_CTIME) {
 653                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 654                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 655                 }
 656                 if (stat->st_result_mask & P9_STATS_UID)
 657                         inode->i_uid = stat->st_uid;
 658                 if (stat->st_result_mask & P9_STATS_GID)
 659                         inode->i_gid = stat->st_gid;
 660                 if (stat->st_result_mask & P9_STATS_NLINK)
 661                         set_nlink(inode, stat->st_nlink);
 662                 if (stat->st_result_mask & P9_STATS_MODE) {
 663                         inode->i_mode = stat->st_mode;
 664                         if ((S_ISBLK(inode->i_mode)) ||
 665                                                 (S_ISCHR(inode->i_mode)))
 666                                 init_special_inode(inode, inode->i_mode,
 667                                                                 inode->i_rdev);
 668                 }
 669                 if (stat->st_result_mask & P9_STATS_RDEV)
 670                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 671                 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
 672                     stat->st_result_mask & P9_STATS_SIZE)
 673                         v9fs_i_size_write(inode, stat->st_size);
 674                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 675                         inode->i_blocks = stat->st_blocks;
 676         }
 677         if (stat->st_result_mask & P9_STATS_GEN)
 678                 inode->i_generation = stat->st_gen;
 679
 680         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 681          * because the inode structure does not have fields for them.
 682          */
 683         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 684 }
 685
 686 static int
 687 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 688                 const char *symname)
 689 {
 690         int err;
 691         kgid_t gid;
 692         const unsigned char *name;
 693         struct p9_qid qid;
 694         struct inode *inode;
 695         struct p9_fid *dfid;
 696         struct p9_fid *fid = NULL;
 697         struct v9fs_session_info *v9ses;
 698
 699         name = dentry->d_name.name;
 700         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 701         v9ses = v9fs_inode2v9ses(dir);
 702
 703         dfid = v9fs_parent_fid(dentry);
 704         if (IS_ERR(dfid)) {
 705                 err = PTR_ERR(dfid);
 706                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 707                 return err;
 708         }
 709
 710         gid = v9fs_get_fsgid_for_create(dir);
 711
 712         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 713         err = p9_client_symlink(dfid, name, symname, gid, &qid);
 714
 715         if (err < 0) {
 716                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 717                 goto error;
 718         }
 719
 720         v9fs_invalidate_inode_attr(dir);
 721         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 722                 /* Now walk from the parent so we can get an unopened fid. */
 723                 fid = p9_client_walk(dfid, 1, &name, 1);
 724                 if (IS_ERR(fid)) {
 725                         err = PTR_ERR(fid);
 726                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 727                                  err);
 728                         fid = NULL;
 729                         goto error;
 730                 }
 731
 732                 /* instantiate inode and assign the unopened fid to dentry */
 733                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 734                 if (IS_ERR(inode)) {
 735                         err = PTR_ERR(inode);
 736                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 737                                  err);
 738                         goto error;
 739                 }
 740                 v9fs_fid_add(dentry, fid);
 741                 d_instantiate(dentry, inode);
 742                 fid = NULL;
 743                 err = 0;
 744         } else {
 745                 /* Not in cached mode. No need to populate inode with stat */
 746                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 747                 if (IS_ERR(inode)) {
 748                         err = PTR_ERR(inode);
 749                         goto error;
 750                 }
 751                 d_instantiate(dentry, inode);
 752         }
 753
 754 error:
 755         if (fid)
 756                 p9_client_clunk(fid);
 757
 758         p9_client_clunk(dfid);
 759         return err;
 760 }
 761
 762 /**
 763  * v9fs_vfs_link_dotl - create a hardlink for dotl
 764  * @old_dentry: dentry for file to link to
 765  * @dir: inode destination for new link
 766  * @dentry: dentry for link
 767  *
 768  */
 769
 770 static int
 771 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 772                 struct dentry *dentry)
 773 {
 774         int err;
 775         struct p9_fid *dfid, *oldfid;
 776         struct v9fs_session_info *v9ses;
 777
 778         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
 779                  dir->i_ino, old_dentry, dentry);
 780
 781         v9ses = v9fs_inode2v9ses(dir);
 782         dfid = v9fs_parent_fid(dentry);
 783         if (IS_ERR(dfid))
 784                 return PTR_ERR(dfid);
 785
 786         oldfid = v9fs_fid_lookup(old_dentry);
 787         if (IS_ERR(oldfid)) {
 788                 p9_client_clunk(dfid);
 789                 return PTR_ERR(oldfid);
 790         }
 791
 792         err = p9_client_link(dfid, oldfid, dentry->d_name.name);
 793
 794         p9_client_clunk(dfid);
 795         p9_client_clunk(oldfid);
 796         if (err < 0) {
 797                 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 798                 return err;
 799         }
 800
 801         v9fs_invalidate_inode_attr(dir);
 802         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 803                 /* Get the latest stat info from server. */
 804                 struct p9_fid *fid;
 805                 fid = v9fs_fid_lookup(old_dentry);
 806                 if (IS_ERR(fid))
 807                         return PTR_ERR(fid);
 808
 809                 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
 810                 p9_client_clunk(fid);
 811         }
 812         ihold(d_inode(old_dentry));
 813         d_instantiate(dentry, d_inode(old_dentry));
 814
 815         return err;
 816 }
 817
 818 /**
 819  * v9fs_vfs_mknod_dotl - create a special file
 820  * @dir: inode destination for new link
 821  * @dentry: dentry for file
 822  * @omode: mode for creation
 823  * @rdev: device associated with special file
 824  *
 825  */
 826 static int
 827 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 828                 dev_t rdev)
 829 {
 830         int err;
 831         kgid_t gid;
 832         const unsigned char *name;
 833         umode_t mode;
 834         struct v9fs_session_info *v9ses;
 835         struct p9_fid *fid = NULL, *dfid = NULL;
 836         struct inode *inode;
 837         struct p9_qid qid;
 838         struct posix_acl *dacl = NULL, *pacl = NULL;
 839
 840         p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
 841                  dir->i_ino, dentry, omode,
 842                  MAJOR(rdev), MINOR(rdev));
 843
 844         v9ses = v9fs_inode2v9ses(dir);
 845         dfid = v9fs_parent_fid(dentry);
 846         if (IS_ERR(dfid)) {
 847                 err = PTR_ERR(dfid);
 848                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 849                 dfid = NULL;
 850                 goto error;
 851         }
 852
 853         gid = v9fs_get_fsgid_for_create(dir);
 854         mode = omode;
 855         /* Update mode based on ACL value */
 856         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 857         if (err) {
 858                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 859                          err);
 860                 goto error;
 861         }
 862         name = dentry->d_name.name;
 863
 864         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 865         if (err < 0)
 866                 goto error;
 867
 868         v9fs_invalidate_inode_attr(dir);
 869         fid = p9_client_walk(dfid, 1, &name, 1);
 870         if (IS_ERR(fid)) {
 871                 err = PTR_ERR(fid);
 872                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 873                          err);
 874                 fid = NULL;
 875                 goto error;
 876         }
 877
 878         /* instantiate inode and assign the unopened fid to the dentry */
 879         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 880                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 881                 if (IS_ERR(inode)) {
 882                         err = PTR_ERR(inode);
 883                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 884                                  err);
 885                         goto error;
 886                 }
 887                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 888                 v9fs_fid_add(dentry, fid);
 889                 d_instantiate(dentry, inode);
 890                 fid = NULL;
 891                 err = 0;
 892         } else {
 893                 /*
 894                  * Not in cached mode. No need to populate inode with stat.
 895                  * socket syscall returns a fd, so we need instantiate
 896                  */
 897                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 898                 if (IS_ERR(inode)) {
 899                         err = PTR_ERR(inode);
 900                         goto error;
 901                 }
 902                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 903                 d_instantiate(dentry, inode);
 904         }
 905 error:
 906         if (fid)
 907                 p9_client_clunk(fid);
 908         v9fs_put_acl(dacl, pacl);
 909         p9_client_clunk(dfid);
 910
 911         return err;
 912 }
 913
 914 /**
 915  * v9fs_vfs_get_link_dotl - follow a symlink path
 916  * @dentry: dentry for symlink
 917  * @inode: inode for symlink
 918  * @done: destructor for return value
 919  */
 920
 921 static const char *
 922 v9fs_vfs_get_link_dotl(struct dentry *dentry,
 923                        struct inode *inode,
 924                        struct delayed_call *done)
 925 {
 926         struct p9_fid *fid;
 927         char *target;
 928         int retval;
 929
 930         if (!dentry)
 931                 return ERR_PTR(-ECHILD);
 932
 933         p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
 934
 935         fid = v9fs_fid_lookup(dentry);
 936         if (IS_ERR(fid))
 937                 return ERR_CAST(fid);
 938         retval = p9_client_readlink(fid, &target);
 939         p9_client_clunk(fid);
 940         if (retval)
 941                 return ERR_PTR(retval);
 942         set_delayed_call(done, kfree_link, target);
 943         return target;
 944 }
 945
 946 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 947 {
 948         struct p9_stat_dotl *st;
 949         struct v9fs_session_info *v9ses;
 950         unsigned int flags;
 951
 952         v9ses = v9fs_inode2v9ses(inode);
 953         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 954         if (IS_ERR(st))
 955                 return PTR_ERR(st);
 956         /*
 957          * Don't update inode if the file type is different
 958          */
 959         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 960                 goto out;
 961
 962         /*
 963          * We don't want to refresh inode->i_size,
 964          * because we may have cached data
 965          */
 966         flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
 967                 V9FS_STAT2INODE_KEEP_ISIZE : 0;
 968         v9fs_stat2inode_dotl(st, inode, flags);
 969 out:
 970         kfree(st);
 971         return 0;
 972 }
 973
 974 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 975         .create = v9fs_vfs_create_dotl,
 976         .atomic_open = v9fs_vfs_atomic_open_dotl,
 977         .lookup = v9fs_vfs_lookup,
 978         .link = v9fs_vfs_link_dotl,
 979         .symlink = v9fs_vfs_symlink_dotl,
 980         .unlink = v9fs_vfs_unlink,
 981         .mkdir = v9fs_vfs_mkdir_dotl,
 982         .rmdir = v9fs_vfs_rmdir,
 983         .mknod = v9fs_vfs_mknod_dotl,
 984         .rename = v9fs_vfs_rename,
 985         .getattr = v9fs_vfs_getattr_dotl,
 986         .setattr = v9fs_vfs_setattr_dotl,
 987         .listxattr = v9fs_listxattr,
 988         .get_acl = v9fs_iop_get_acl,
 989 };
 990
 991 const struct inode_operations v9fs_file_inode_operations_dotl = {
 992         .getattr = v9fs_vfs_getattr_dotl,
 993         .setattr = v9fs_vfs_setattr_dotl,
 994         .listxattr = v9fs_listxattr,
 995         .get_acl = v9fs_iop_get_acl,
 996 };
 997
 998 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 999         .get_link = v9fs_vfs_get_link_dotl,
1000         .getattr = v9fs_vfs_getattr_dotl,
1001         .setattr = v9fs_vfs_setattr_dotl,
1002         .listxattr = v9fs_listxattr,
1003 };