fs/9p/vfs_inode_dotl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This file contains vfs inode ops for the 9P2000.L protocol.
   4  *
   5  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   6  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/errno.h>
  11 #include <linux/fs.h>
  12 #include <linux/file.h>
  13 #include <linux/pagemap.h>
  14 #include <linux/stat.h>
  15 #include <linux/string.h>
  16 #include <linux/namei.h>
  17 #include <linux/sched.h>
  18 #include <linux/slab.h>
  19 #include <linux/xattr.h>
  20 #include <linux/posix_acl.h>
  21 #include <net/9p/9p.h>
  22 #include <net/9p/client.h>
  23
  24 #include "v9fs.h"
  25 #include "v9fs_vfs.h"
  26 #include "fid.h"
  27 #include "cache.h"
  28 #include "xattr.h"
  29 #include "acl.h"
  30
  31 static int
  32 v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
  33                     struct dentry *dentry, umode_t omode, dev_t rdev);
  34
  35 /**
  36  * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object
  37  * @dir_inode: The directory inode
  38  *
  39  * Helper function to get the gid for creating a
  40  * new file system object. This checks the S_ISGID to determine the owning
  41  * group of the new file system object.
  42  */
  43
  44 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
  45 {
  46         BUG_ON(dir_inode == NULL);
  47
  48         if (dir_inode->i_mode & S_ISGID) {
  49                 /* set_gid bit is set.*/
  50                 return dir_inode->i_gid;
  51         }
  52         return current_fsgid();
  53 }
  54
  55
  56
  57 struct inode *
  58 v9fs_fid_iget_dotl(struct super_block *sb, struct p9_fid *fid, bool new)
  59 {
  60         int retval;
  61         struct inode *inode;
  62         struct p9_stat_dotl *st;
  63         struct v9fs_session_info *v9ses = sb->s_fs_info;
  64
  65         inode = iget_locked(sb, QID2INO(&fid->qid));
  66         if (unlikely(!inode))
  67                 return ERR_PTR(-ENOMEM);
  68         if (!(inode->i_state & I_NEW)) {
  69                 if (!new) {
  70                         goto done;
  71                 } else { /* deal with race condition in inode number reuse */
  72                         p9_debug(P9_DEBUG_ERROR, "WARNING: Inode collision %lx\n",
  73                                                 inode->i_ino);
  74                         iput(inode);
  75                         remove_inode_hash(inode);
  76                         inode = iget_locked(sb, QID2INO(&fid->qid));
  77                         WARN_ON(!(inode->i_state & I_NEW));
  78                 }
  79         }
  80
  81         /*
  82          * initialize the inode with the stat info
  83          * FIXME!! we may need support for stale inodes
  84          * later.
  85          */
  86         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
  87         if (IS_ERR(st)) {
  88                 retval = PTR_ERR(st);
  89                 goto error;
  90         }
  91
  92         retval = v9fs_init_inode(v9ses, inode, &fid->qid,
  93                                  st->st_mode, new_decode_dev(st->st_rdev));
  94         v9fs_stat2inode_dotl(st, inode, 0);
  95         kfree(st);
  96         if (retval)
  97                 goto error;
  98
  99         v9fs_set_netfs_context(inode);
 100         v9fs_cache_inode_get_cookie(inode);
 101         retval = v9fs_get_acl(inode, fid);
 102         if (retval)
 103                 goto error;
 104
 105         unlock_new_inode(inode);
 106 done:
 107         return inode;
 108 error:
 109         iget_failed(inode);
 110         return ERR_PTR(retval);
 111 }
 112
 113 struct dotl_openflag_map {
 114         int open_flag;
 115         int dotl_flag;
 116 };
 117
 118 static int v9fs_mapped_dotl_flags(int flags)
 119 {
 120         int i;
 121         int rflags = 0;
 122         struct dotl_openflag_map dotl_oflag_map[] = {
 123                 { O_CREAT,      P9_DOTL_CREATE },
 124                 { O_EXCL,       P9_DOTL_EXCL },
 125                 { O_NOCTTY,     P9_DOTL_NOCTTY },
 126                 { O_APPEND,     P9_DOTL_APPEND },
 127                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
 128                 { O_DSYNC,      P9_DOTL_DSYNC },
 129                 { FASYNC,       P9_DOTL_FASYNC },
 130                 { O_DIRECT,     P9_DOTL_DIRECT },
 131                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
 132                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
 133                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
 134                 { O_NOATIME,    P9_DOTL_NOATIME },
 135                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
 136                 { O_SYNC,       P9_DOTL_SYNC},
 137         };
 138         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
 139                 if (flags & dotl_oflag_map[i].open_flag)
 140                         rflags |= dotl_oflag_map[i].dotl_flag;
 141         }
 142         return rflags;
 143 }
 144
 145 /**
 146  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 147  * plan 9 open flag.
 148  * @flags: flags to convert
 149  */
 150 int v9fs_open_to_dotl_flags(int flags)
 151 {
 152         int rflags = 0;
 153
 154         /*
 155          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
 156          * and P9_DOTL_NOACCESS
 157          */
 158         rflags |= flags & O_ACCMODE;
 159         rflags |= v9fs_mapped_dotl_flags(flags);
 160
 161         return rflags;
 162 }
 163
 164 /**
 165  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 166  * @idmap: The user namespace of the mount
 167  * @dir: directory inode that is being created
 168  * @dentry:  dentry that is being deleted
 169  * @omode: create permissions
 170  * @excl: True if the file must not yet exist
 171  *
 172  */
 173 static int
 174 v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir,
 175                      struct dentry *dentry, umode_t omode, bool excl)
 176 {
 177         return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0);
 178 }
 179
 180 static int
 181 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 182                           struct file *file, unsigned int flags, umode_t omode)
 183 {
 184         int err = 0;
 185         kgid_t gid;
 186         umode_t mode;
 187         int p9_omode = v9fs_open_to_dotl_flags(flags);
 188         const unsigned char *name = NULL;
 189         struct p9_qid qid;
 190         struct inode *inode;
 191         struct p9_fid *fid = NULL;
 192         struct p9_fid *dfid = NULL, *ofid = NULL;
 193         struct v9fs_session_info *v9ses;
 194         struct posix_acl *pacl = NULL, *dacl = NULL;
 195         struct dentry *res = NULL;
 196
 197         if (d_in_lookup(dentry)) {
 198                 res = v9fs_vfs_lookup(dir, dentry, 0);
 199                 if (IS_ERR(res))
 200                         return PTR_ERR(res);
 201
 202                 if (res)
 203                         dentry = res;
 204         }
 205
 206         /* Only creates */
 207         if (!(flags & O_CREAT) || d_really_is_positive(dentry))
 208                 return  finish_no_open(file, res);
 209
 210         v9ses = v9fs_inode2v9ses(dir);
 211
 212         name = dentry->d_name.name;
 213         p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
 214                  name, flags, omode);
 215
 216         dfid = v9fs_parent_fid(dentry);
 217         if (IS_ERR(dfid)) {
 218                 err = PTR_ERR(dfid);
 219                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 220                 goto out;
 221         }
 222
 223         /* clone a fid to use for creation */
 224         ofid = clone_fid(dfid);
 225         if (IS_ERR(ofid)) {
 226                 err = PTR_ERR(ofid);
 227                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 228                 goto out;
 229         }
 230
 231         gid = v9fs_get_fsgid_for_create(dir);
 232
 233         mode = omode;
 234         /* Update mode based on ACL value */
 235         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 236         if (err) {
 237                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n",
 238                          err);
 239                 goto out;
 240         }
 241
 242         if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
 243                 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
 244                 p9_debug(P9_DEBUG_CACHE,
 245                         "write-only file with writeback enabled, creating w/ O_RDWR\n");
 246         }
 247         err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid);
 248         if (err < 0) {
 249                 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n",
 250                          err);
 251                 goto out;
 252         }
 253         v9fs_invalidate_inode_attr(dir);
 254
 255         /* instantiate inode and assign the unopened fid to the dentry */
 256         fid = p9_client_walk(dfid, 1, &name, 1);
 257         if (IS_ERR(fid)) {
 258                 err = PTR_ERR(fid);
 259                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 260                 goto out;
 261         }
 262         inode = v9fs_fid_iget_dotl(dir->i_sb, fid, true);
 263         if (IS_ERR(inode)) {
 264                 err = PTR_ERR(inode);
 265                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 266                 goto out;
 267         }
 268         /* Now set the ACL based on the default value */
 269         v9fs_set_create_acl(inode, fid, dacl, pacl);
 270
 271         v9fs_fid_add(dentry, &fid);
 272         d_instantiate(dentry, inode);
 273
 274         /* Since we are opening a file, assign the open fid to the file */
 275         err = finish_open(file, dentry, generic_file_open);
 276         if (err)
 277                 goto out;
 278         file->private_data = ofid;
 279 #ifdef CONFIG_9P_FSCACHE
 280         if (v9ses->cache & CACHE_FSCACHE) {
 281                 struct v9fs_inode *v9inode = V9FS_I(inode);
 282                 fscache_use_cookie(v9fs_inode_cookie(v9inode),
 283                                    file->f_mode & FMODE_WRITE);
 284         }
 285 #endif
 286         v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags);
 287         v9fs_open_fid_add(inode, &ofid);
 288         file->f_mode |= FMODE_CREATED;
 289 out:
 290         p9_fid_put(dfid);
 291         p9_fid_put(ofid);
 292         p9_fid_put(fid);
 293         v9fs_put_acl(dacl, pacl);
 294         dput(res);
 295         return err;
 296 }
 297
 298 /**
 299  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 300  * @idmap: The idmap of the mount
 301  * @dir:  inode that is being unlinked
 302  * @dentry: dentry that is being unlinked
 303  * @omode: mode for new directory
 304  *
 305  */
 306
 307 static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
 308                                struct inode *dir, struct dentry *dentry,
 309                                umode_t omode)
 310 {
 311         int err;
 312         struct p9_fid *fid = NULL, *dfid = NULL;
 313         kgid_t gid;
 314         const unsigned char *name;
 315         umode_t mode;
 316         struct inode *inode;
 317         struct p9_qid qid;
 318         struct posix_acl *dacl = NULL, *pacl = NULL;
 319
 320         p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
 321
 322         omode |= S_IFDIR;
 323         if (dir->i_mode & S_ISGID)
 324                 omode |= S_ISGID;
 325
 326         dfid = v9fs_parent_fid(dentry);
 327         if (IS_ERR(dfid)) {
 328                 err = PTR_ERR(dfid);
 329                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 330                 goto error;
 331         }
 332
 333         gid = v9fs_get_fsgid_for_create(dir);
 334         mode = omode;
 335         /* Update mode based on ACL value */
 336         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 337         if (err) {
 338                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 339                          err);
 340                 goto error;
 341         }
 342         name = dentry->d_name.name;
 343         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 344         if (err < 0)
 345                 goto error;
 346         fid = p9_client_walk(dfid, 1, &name, 1);
 347         if (IS_ERR(fid)) {
 348                 err = PTR_ERR(fid);
 349                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 350                          err);
 351                 goto error;
 352         }
 353
 354         /* instantiate inode and assign the unopened fid to the dentry */
 355         inode = v9fs_fid_iget_dotl(dir->i_sb, fid, true);
 356         if (IS_ERR(inode)) {
 357                 err = PTR_ERR(inode);
 358                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 359                          err);
 360                 goto error;
 361         }
 362         v9fs_fid_add(dentry, &fid);
 363         v9fs_set_create_acl(inode, fid, dacl, pacl);
 364         d_instantiate(dentry, inode);
 365         err = 0;
 366         inc_nlink(dir);
 367         v9fs_invalidate_inode_attr(dir);
 368 error:
 369         p9_fid_put(fid);
 370         v9fs_put_acl(dacl, pacl);
 371         p9_fid_put(dfid);
 372         return err;
 373 }
 374
 375 static int
 376 v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap,
 377                       const struct path *path, struct kstat *stat,
 378                       u32 request_mask, unsigned int flags)
 379 {
 380         struct dentry *dentry = path->dentry;
 381         struct v9fs_session_info *v9ses;
 382         struct p9_fid *fid;
 383         struct inode *inode = d_inode(dentry);
 384         struct p9_stat_dotl *st;
 385
 386         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 387         v9ses = v9fs_dentry2v9ses(dentry);
 388         if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
 389                 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
 390                 return 0;
 391         } else if (v9ses->cache) {
 392                 if (S_ISREG(inode->i_mode)) {
 393                         int retval = filemap_fdatawrite(inode->i_mapping);
 394
 395                         if (retval)
 396                                 p9_debug(P9_DEBUG_ERROR,
 397                                     "flushing writeback during getattr returned %d\n", retval);
 398                 }
 399         }
 400         fid = v9fs_fid_lookup(dentry);
 401         if (IS_ERR(fid))
 402                 return PTR_ERR(fid);
 403
 404         /* Ask for all the fields in stat structure. Server will return
 405          * whatever it supports
 406          */
 407
 408         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 409         p9_fid_put(fid);
 410         if (IS_ERR(st))
 411                 return PTR_ERR(st);
 412
 413         v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
 414         generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
 415         /* Change block size to what the server returned */
 416         stat->blksize = st->st_blksize;
 417
 418         kfree(st);
 419         return 0;
 420 }
 421
 422 /*
 423  * Attribute flags.
 424  */
 425 #define P9_ATTR_MODE            (1 << 0)
 426 #define P9_ATTR_UID             (1 << 1)
 427 #define P9_ATTR_GID             (1 << 2)
 428 #define P9_ATTR_SIZE            (1 << 3)
 429 #define P9_ATTR_ATIME           (1 << 4)
 430 #define P9_ATTR_MTIME           (1 << 5)
 431 #define P9_ATTR_CTIME           (1 << 6)
 432 #define P9_ATTR_ATIME_SET       (1 << 7)
 433 #define P9_ATTR_MTIME_SET       (1 << 8)
 434
 435 struct dotl_iattr_map {
 436         int iattr_valid;
 437         int p9_iattr_valid;
 438 };
 439
 440 static int v9fs_mapped_iattr_valid(int iattr_valid)
 441 {
 442         int i;
 443         int p9_iattr_valid = 0;
 444         struct dotl_iattr_map dotl_iattr_map[] = {
 445                 { ATTR_MODE,            P9_ATTR_MODE },
 446                 { ATTR_UID,             P9_ATTR_UID },
 447                 { ATTR_GID,             P9_ATTR_GID },
 448                 { ATTR_SIZE,            P9_ATTR_SIZE },
 449                 { ATTR_ATIME,           P9_ATTR_ATIME },
 450                 { ATTR_MTIME,           P9_ATTR_MTIME },
 451                 { ATTR_CTIME,           P9_ATTR_CTIME },
 452                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 453                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 454         };
 455         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 456                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 457                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 458         }
 459         return p9_iattr_valid;
 460 }
 461
 462 /**
 463  * v9fs_vfs_setattr_dotl - set file metadata
 464  * @idmap: idmap of the mount
 465  * @dentry: file whose metadata to set
 466  * @iattr: metadata assignment structure
 467  *
 468  */
 469
 470 int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
 471                           struct dentry *dentry, struct iattr *iattr)
 472 {
 473         int retval, use_dentry = 0;
 474         struct inode *inode = d_inode(dentry);
 475         struct v9fs_session_info __maybe_unused *v9ses;
 476         struct p9_fid *fid = NULL;
 477         struct p9_iattr_dotl p9attr = {
 478                 .uid = INVALID_UID,
 479                 .gid = INVALID_GID,
 480         };
 481
 482         p9_debug(P9_DEBUG_VFS, "\n");
 483
 484         retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
 485         if (retval)
 486                 return retval;
 487
 488         v9ses = v9fs_dentry2v9ses(dentry);
 489
 490         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 491         if (iattr->ia_valid & ATTR_MODE)
 492                 p9attr.mode = iattr->ia_mode;
 493         if (iattr->ia_valid & ATTR_UID)
 494                 p9attr.uid = iattr->ia_uid;
 495         if (iattr->ia_valid & ATTR_GID)
 496                 p9attr.gid = iattr->ia_gid;
 497         if (iattr->ia_valid & ATTR_SIZE)
 498                 p9attr.size = iattr->ia_size;
 499         if (iattr->ia_valid & ATTR_ATIME_SET) {
 500                 p9attr.atime_sec = iattr->ia_atime.tv_sec;
 501                 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 502         }
 503         if (iattr->ia_valid & ATTR_MTIME_SET) {
 504                 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 505                 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 506         }
 507
 508         if (iattr->ia_valid & ATTR_FILE) {
 509                 fid = iattr->ia_file->private_data;
 510                 WARN_ON(!fid);
 511         }
 512         if (!fid) {
 513                 fid = v9fs_fid_lookup(dentry);
 514                 use_dentry = 1;
 515         }
 516         if (IS_ERR(fid))
 517                 return PTR_ERR(fid);
 518
 519         /* Write all dirty data */
 520         if (S_ISREG(inode->i_mode)) {
 521                 retval = filemap_fdatawrite(inode->i_mapping);
 522                 if (retval < 0)
 523                         p9_debug(P9_DEBUG_ERROR,
 524                             "Flushing file prior to setattr failed: %d\n", retval);
 525         }
 526
 527         retval = p9_client_setattr(fid, &p9attr);
 528         if (retval < 0) {
 529                 if (use_dentry)
 530                         p9_fid_put(fid);
 531                 return retval;
 532         }
 533
 534         if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size !=
 535                  i_size_read(inode)) {
 536                 truncate_setsize(inode, iattr->ia_size);
 537                 netfs_resize_file(netfs_inode(inode), iattr->ia_size, true);
 538
 539 #ifdef CONFIG_9P_FSCACHE
 540                 if (v9ses->cache & CACHE_FSCACHE)
 541                         fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)),
 542                                 iattr->ia_size);
 543 #endif
 544         }
 545
 546         v9fs_invalidate_inode_attr(inode);
 547         setattr_copy(&nop_mnt_idmap, inode, iattr);
 548         mark_inode_dirty(inode);
 549         if (iattr->ia_valid & ATTR_MODE) {
 550                 /* We also want to update ACL when we update mode bits */
 551                 retval = v9fs_acl_chmod(inode, fid);
 552                 if (retval < 0) {
 553                         if (use_dentry)
 554                                 p9_fid_put(fid);
 555                         return retval;
 556                 }
 557         }
 558         if (use_dentry)
 559                 p9_fid_put(fid);
 560
 561         return 0;
 562 }
 563
 564 /**
 565  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 566  * @stat: stat structure
 567  * @inode: inode to populate
 568  * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
 569  *
 570  */
 571
 572 void
 573 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
 574                       unsigned int flags)
 575 {
 576         umode_t mode;
 577         struct v9fs_inode *v9inode = V9FS_I(inode);
 578
 579         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 580                 inode_set_atime(inode, stat->st_atime_sec,
 581                                 stat->st_atime_nsec);
 582                 inode_set_mtime(inode, stat->st_mtime_sec,
 583                                 stat->st_mtime_nsec);
 584                 inode_set_ctime(inode, stat->st_ctime_sec,
 585                                 stat->st_ctime_nsec);
 586                 inode->i_uid = stat->st_uid;
 587                 inode->i_gid = stat->st_gid;
 588                 set_nlink(inode, stat->st_nlink);
 589
 590                 mode = stat->st_mode & S_IALLUGO;
 591                 mode |= inode->i_mode & ~S_IALLUGO;
 592                 inode->i_mode = mode;
 593
 594                 v9inode->netfs.remote_i_size = stat->st_size;
 595                 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
 596                         v9fs_i_size_write(inode, stat->st_size);
 597                 inode->i_blocks = stat->st_blocks;
 598         } else {
 599                 if (stat->st_result_mask & P9_STATS_ATIME) {
 600                         inode_set_atime(inode, stat->st_atime_sec,
 601                                         stat->st_atime_nsec);
 602                 }
 603                 if (stat->st_result_mask & P9_STATS_MTIME) {
 604                         inode_set_mtime(inode, stat->st_mtime_sec,
 605                                         stat->st_mtime_nsec);
 606                 }
 607                 if (stat->st_result_mask & P9_STATS_CTIME) {
 608                         inode_set_ctime(inode, stat->st_ctime_sec,
 609                                         stat->st_ctime_nsec);
 610                 }
 611                 if (stat->st_result_mask & P9_STATS_UID)
 612                         inode->i_uid = stat->st_uid;
 613                 if (stat->st_result_mask & P9_STATS_GID)
 614                         inode->i_gid = stat->st_gid;
 615                 if (stat->st_result_mask & P9_STATS_NLINK)
 616                         set_nlink(inode, stat->st_nlink);
 617                 if (stat->st_result_mask & P9_STATS_MODE) {
 618                         mode = stat->st_mode & S_IALLUGO;
 619                         mode |= inode->i_mode & ~S_IALLUGO;
 620                         inode->i_mode = mode;
 621                 }
 622                 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
 623                     stat->st_result_mask & P9_STATS_SIZE) {
 624                         v9inode->netfs.remote_i_size = stat->st_size;
 625                         v9fs_i_size_write(inode, stat->st_size);
 626                 }
 627                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 628                         inode->i_blocks = stat->st_blocks;
 629         }
 630         if (stat->st_result_mask & P9_STATS_GEN)
 631                 inode->i_generation = stat->st_gen;
 632
 633         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 634          * because the inode structure does not have fields for them.
 635          */
 636         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 637 }
 638
 639 static int
 640 v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir,
 641                       struct dentry *dentry, const char *symname)
 642 {
 643         int err;
 644         kgid_t gid;
 645         const unsigned char *name;
 646         struct p9_qid qid;
 647         struct p9_fid *dfid;
 648         struct p9_fid *fid = NULL;
 649
 650         name = dentry->d_name.name;
 651         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 652
 653         dfid = v9fs_parent_fid(dentry);
 654         if (IS_ERR(dfid)) {
 655                 err = PTR_ERR(dfid);
 656                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 657                 return err;
 658         }
 659
 660         gid = v9fs_get_fsgid_for_create(dir);
 661
 662         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 663         err = p9_client_symlink(dfid, name, symname, gid, &qid);
 664
 665         if (err < 0) {
 666                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 667                 goto error;
 668         }
 669
 670         v9fs_invalidate_inode_attr(dir);
 671
 672 error:
 673         p9_fid_put(fid);
 674         p9_fid_put(dfid);
 675         return err;
 676 }
 677
 678 /**
 679  * v9fs_vfs_link_dotl - create a hardlink for dotl
 680  * @old_dentry: dentry for file to link to
 681  * @dir: inode destination for new link
 682  * @dentry: dentry for link
 683  *
 684  */
 685
 686 static int
 687 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 688                 struct dentry *dentry)
 689 {
 690         int err;
 691         struct p9_fid *dfid, *oldfid;
 692         struct v9fs_session_info *v9ses;
 693
 694         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
 695                  dir->i_ino, old_dentry, dentry);
 696
 697         v9ses = v9fs_inode2v9ses(dir);
 698         dfid = v9fs_parent_fid(dentry);
 699         if (IS_ERR(dfid))
 700                 return PTR_ERR(dfid);
 701
 702         oldfid = v9fs_fid_lookup(old_dentry);
 703         if (IS_ERR(oldfid)) {
 704                 p9_fid_put(dfid);
 705                 return PTR_ERR(oldfid);
 706         }
 707
 708         err = p9_client_link(dfid, oldfid, dentry->d_name.name);
 709
 710         p9_fid_put(dfid);
 711         p9_fid_put(oldfid);
 712         if (err < 0) {
 713                 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 714                 return err;
 715         }
 716
 717         v9fs_invalidate_inode_attr(dir);
 718         if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
 719                 /* Get the latest stat info from server. */
 720                 struct p9_fid *fid;
 721
 722                 fid = v9fs_fid_lookup(old_dentry);
 723                 if (IS_ERR(fid))
 724                         return PTR_ERR(fid);
 725
 726                 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
 727                 p9_fid_put(fid);
 728         }
 729         ihold(d_inode(old_dentry));
 730         d_instantiate(dentry, d_inode(old_dentry));
 731
 732         return err;
 733 }
 734
 735 /**
 736  * v9fs_vfs_mknod_dotl - create a special file
 737  * @idmap: The idmap of the mount
 738  * @dir: inode destination for new link
 739  * @dentry: dentry for file
 740  * @omode: mode for creation
 741  * @rdev: device associated with special file
 742  *
 743  */
 744 static int
 745 v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
 746                     struct dentry *dentry, umode_t omode, dev_t rdev)
 747 {
 748         int err;
 749         kgid_t gid;
 750         const unsigned char *name;
 751         umode_t mode;
 752         struct p9_fid *fid = NULL, *dfid = NULL;
 753         struct inode *inode;
 754         struct p9_qid qid;
 755         struct posix_acl *dacl = NULL, *pacl = NULL;
 756
 757         p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
 758                  dir->i_ino, dentry, omode,
 759                  MAJOR(rdev), MINOR(rdev));
 760
 761         dfid = v9fs_parent_fid(dentry);
 762         if (IS_ERR(dfid)) {
 763                 err = PTR_ERR(dfid);
 764                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 765                 goto error;
 766         }
 767
 768         gid = v9fs_get_fsgid_for_create(dir);
 769         mode = omode;
 770         /* Update mode based on ACL value */
 771         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 772         if (err) {
 773                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 774                          err);
 775                 goto error;
 776         }
 777         name = dentry->d_name.name;
 778
 779         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 780         if (err < 0)
 781                 goto error;
 782
 783         v9fs_invalidate_inode_attr(dir);
 784         fid = p9_client_walk(dfid, 1, &name, 1);
 785         if (IS_ERR(fid)) {
 786                 err = PTR_ERR(fid);
 787                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 788                          err);
 789                 goto error;
 790         }
 791         inode = v9fs_fid_iget_dotl(dir->i_sb, fid, true);
 792         if (IS_ERR(inode)) {
 793                 err = PTR_ERR(inode);
 794                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 795                          err);
 796                 goto error;
 797         }
 798         v9fs_set_create_acl(inode, fid, dacl, pacl);
 799         v9fs_fid_add(dentry, &fid);
 800         d_instantiate(dentry, inode);
 801         err = 0;
 802 error:
 803         p9_fid_put(fid);
 804         v9fs_put_acl(dacl, pacl);
 805         p9_fid_put(dfid);
 806
 807         return err;
 808 }
 809
 810 /**
 811  * v9fs_vfs_get_link_dotl - follow a symlink path
 812  * @dentry: dentry for symlink
 813  * @inode: inode for symlink
 814  * @done: destructor for return value
 815  */
 816
 817 static const char *
 818 v9fs_vfs_get_link_dotl(struct dentry *dentry,
 819                        struct inode *inode,
 820                        struct delayed_call *done)
 821 {
 822         struct p9_fid *fid;
 823         char *target;
 824         int retval;
 825
 826         if (!dentry)
 827                 return ERR_PTR(-ECHILD);
 828
 829         p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
 830
 831         fid = v9fs_fid_lookup(dentry);
 832         if (IS_ERR(fid))
 833                 return ERR_CAST(fid);
 834         retval = p9_client_readlink(fid, &target);
 835         p9_fid_put(fid);
 836         if (retval)
 837                 return ERR_PTR(retval);
 838         set_delayed_call(done, kfree_link, target);
 839         return target;
 840 }
 841
 842 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 843 {
 844         struct p9_stat_dotl *st;
 845         struct v9fs_session_info *v9ses;
 846         unsigned int flags;
 847
 848         v9ses = v9fs_inode2v9ses(inode);
 849         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 850         if (IS_ERR(st))
 851                 return PTR_ERR(st);
 852         /*
 853          * Don't update inode if the file type is different
 854          */
 855         if (inode_wrong_type(inode, st->st_mode))
 856                 goto out;
 857
 858         /*
 859          * We don't want to refresh inode->i_size,
 860          * because we may have cached data
 861          */
 862         flags = (v9ses->cache & CACHE_LOOSE) ?
 863                 V9FS_STAT2INODE_KEEP_ISIZE : 0;
 864         v9fs_stat2inode_dotl(st, inode, flags);
 865 out:
 866         kfree(st);
 867         return 0;
 868 }
 869
 870 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 871         .create = v9fs_vfs_create_dotl,
 872         .atomic_open = v9fs_vfs_atomic_open_dotl,
 873         .lookup = v9fs_vfs_lookup,
 874         .link = v9fs_vfs_link_dotl,
 875         .symlink = v9fs_vfs_symlink_dotl,
 876         .unlink = v9fs_vfs_unlink,
 877         .mkdir = v9fs_vfs_mkdir_dotl,
 878         .rmdir = v9fs_vfs_rmdir,
 879         .mknod = v9fs_vfs_mknod_dotl,
 880         .rename = v9fs_vfs_rename,
 881         .getattr = v9fs_vfs_getattr_dotl,
 882         .setattr = v9fs_vfs_setattr_dotl,
 883         .listxattr = v9fs_listxattr,
 884         .get_inode_acl = v9fs_iop_get_inode_acl,
 885         .get_acl = v9fs_iop_get_acl,
 886         .set_acl = v9fs_iop_set_acl,
 887 };
 888
 889 const struct inode_operations v9fs_file_inode_operations_dotl = {
 890         .getattr = v9fs_vfs_getattr_dotl,
 891         .setattr = v9fs_vfs_setattr_dotl,
 892         .listxattr = v9fs_listxattr,
 893         .get_inode_acl = v9fs_iop_get_inode_acl,
 894         .get_acl = v9fs_iop_get_acl,
 895         .set_acl = v9fs_iop_set_acl,
 896 };
 897
 898 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 899         .get_link = v9fs_vfs_get_link_dotl,
 900         .getattr = v9fs_vfs_getattr_dotl,
 901         .setattr = v9fs_vfs_setattr_dotl,
 902         .listxattr = v9fs_listxattr,
 903 };