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 user_namespace *mnt_userns, struct inode *dir,
  37                     struct dentry *dentry, umode_t omode, 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 user_namespace *mnt_userns, struct inode *dir,
 222                      struct dentry *dentry, umode_t omode, bool excl)
 223 {
 224         return v9fs_vfs_mknod_dotl(mnt_userns, 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 user_namespace *mnt_userns,
 371                                struct inode *dir, struct dentry *dentry,
 372                                umode_t omode)
 373 {
 374         int err;
 375         struct v9fs_session_info *v9ses;
 376         struct p9_fid *fid = NULL, *dfid = NULL;
 377         kgid_t gid;
 378         const unsigned char *name;
 379         umode_t mode;
 380         struct inode *inode;
 381         struct p9_qid qid;
 382         struct posix_acl *dacl = NULL, *pacl = NULL;
 383
 384         p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
 385         err = 0;
 386         v9ses = v9fs_inode2v9ses(dir);
 387
 388         omode |= S_IFDIR;
 389         if (dir->i_mode & S_ISGID)
 390                 omode |= S_ISGID;
 391
 392         dfid = v9fs_parent_fid(dentry);
 393         if (IS_ERR(dfid)) {
 394                 err = PTR_ERR(dfid);
 395                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 396                 dfid = NULL;
 397                 goto error;
 398         }
 399
 400         gid = v9fs_get_fsgid_for_create(dir);
 401         mode = omode;
 402         /* Update mode based on ACL value */
 403         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 404         if (err) {
 405                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 406                          err);
 407                 goto error;
 408         }
 409         name = dentry->d_name.name;
 410         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 411         if (err < 0)
 412                 goto error;
 413         fid = p9_client_walk(dfid, 1, &name, 1);
 414         if (IS_ERR(fid)) {
 415                 err = PTR_ERR(fid);
 416                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 417                          err);
 418                 fid = NULL;
 419                 goto error;
 420         }
 421
 422         /* instantiate inode and assign the unopened fid to the dentry */
 423         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 424                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 425                 if (IS_ERR(inode)) {
 426                         err = PTR_ERR(inode);
 427                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 428                                  err);
 429                         goto error;
 430                 }
 431                 v9fs_fid_add(dentry, fid);
 432                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 433                 d_instantiate(dentry, inode);
 434                 fid = NULL;
 435                 err = 0;
 436         } else {
 437                 /*
 438                  * Not in cached mode. No need to populate
 439                  * inode with stat. We need to get an inode
 440                  * so that we can set the acl with dentry
 441                  */
 442                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 443                 if (IS_ERR(inode)) {
 444                         err = PTR_ERR(inode);
 445                         goto error;
 446                 }
 447                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 448                 d_instantiate(dentry, inode);
 449         }
 450         inc_nlink(dir);
 451         v9fs_invalidate_inode_attr(dir);
 452 error:
 453         if (fid)
 454                 p9_client_clunk(fid);
 455         v9fs_put_acl(dacl, pacl);
 456         p9_client_clunk(dfid);
 457         return err;
 458 }
 459
 460 static int
 461 v9fs_vfs_getattr_dotl(struct user_namespace *mnt_userns,
 462                       const struct path *path, struct kstat *stat,
 463                       u32 request_mask, unsigned int flags)
 464 {
 465         struct dentry *dentry = path->dentry;
 466         struct v9fs_session_info *v9ses;
 467         struct p9_fid *fid;
 468         struct p9_stat_dotl *st;
 469
 470         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 471         v9ses = v9fs_dentry2v9ses(dentry);
 472         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 473                 generic_fillattr(&init_user_ns, d_inode(dentry), stat);
 474                 return 0;
 475         }
 476         fid = v9fs_fid_lookup(dentry);
 477         if (IS_ERR(fid))
 478                 return PTR_ERR(fid);
 479
 480         /* Ask for all the fields in stat structure. Server will return
 481          * whatever it supports
 482          */
 483
 484         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 485         p9_client_clunk(fid);
 486         if (IS_ERR(st))
 487                 return PTR_ERR(st);
 488
 489         v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
 490         generic_fillattr(&init_user_ns, d_inode(dentry), stat);
 491         /* Change block size to what the server returned */
 492         stat->blksize = st->st_blksize;
 493
 494         kfree(st);
 495         return 0;
 496 }
 497
 498 /*
 499  * Attribute flags.
 500  */
 501 #define P9_ATTR_MODE            (1 << 0)
 502 #define P9_ATTR_UID             (1 << 1)
 503 #define P9_ATTR_GID             (1 << 2)
 504 #define P9_ATTR_SIZE            (1 << 3)
 505 #define P9_ATTR_ATIME           (1 << 4)
 506 #define P9_ATTR_MTIME           (1 << 5)
 507 #define P9_ATTR_CTIME           (1 << 6)
 508 #define P9_ATTR_ATIME_SET       (1 << 7)
 509 #define P9_ATTR_MTIME_SET       (1 << 8)
 510
 511 struct dotl_iattr_map {
 512         int iattr_valid;
 513         int p9_iattr_valid;
 514 };
 515
 516 static int v9fs_mapped_iattr_valid(int iattr_valid)
 517 {
 518         int i;
 519         int p9_iattr_valid = 0;
 520         struct dotl_iattr_map dotl_iattr_map[] = {
 521                 { ATTR_MODE,            P9_ATTR_MODE },
 522                 { ATTR_UID,             P9_ATTR_UID },
 523                 { ATTR_GID,             P9_ATTR_GID },
 524                 { ATTR_SIZE,            P9_ATTR_SIZE },
 525                 { ATTR_ATIME,           P9_ATTR_ATIME },
 526                 { ATTR_MTIME,           P9_ATTR_MTIME },
 527                 { ATTR_CTIME,           P9_ATTR_CTIME },
 528                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 529                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 530         };
 531         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 532                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 533                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 534         }
 535         return p9_iattr_valid;
 536 }
 537
 538 /**
 539  * v9fs_vfs_setattr_dotl - set file metadata
 540  * @dentry: file whose metadata to set
 541  * @iattr: metadata assignment structure
 542  *
 543  */
 544
 545 int v9fs_vfs_setattr_dotl(struct user_namespace *mnt_userns,
 546                           struct dentry *dentry, struct iattr *iattr)
 547 {
 548         int retval, use_dentry = 0;
 549         struct p9_fid *fid = NULL;
 550         struct p9_iattr_dotl p9attr;
 551         struct inode *inode = d_inode(dentry);
 552
 553         p9_debug(P9_DEBUG_VFS, "\n");
 554
 555         retval = setattr_prepare(&init_user_ns, dentry, iattr);
 556         if (retval)
 557                 return retval;
 558
 559         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 560         p9attr.mode = iattr->ia_mode;
 561         p9attr.uid = iattr->ia_uid;
 562         p9attr.gid = iattr->ia_gid;
 563         p9attr.size = iattr->ia_size;
 564         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 565         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 566         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 567         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 568
 569         if (iattr->ia_valid & ATTR_FILE) {
 570                 fid = iattr->ia_file->private_data;
 571                 WARN_ON(!fid);
 572         }
 573         if (!fid) {
 574                 fid = v9fs_fid_lookup(dentry);
 575                 use_dentry = 1;
 576         }
 577         if (IS_ERR(fid))
 578                 return PTR_ERR(fid);
 579
 580         /* Write all dirty data */
 581         if (S_ISREG(inode->i_mode))
 582                 filemap_write_and_wait(inode->i_mapping);
 583
 584         retval = p9_client_setattr(fid, &p9attr);
 585         if (retval < 0) {
 586                 if (use_dentry)
 587                         p9_client_clunk(fid);
 588                 return retval;
 589         }
 590
 591         if ((iattr->ia_valid & ATTR_SIZE) &&
 592             iattr->ia_size != i_size_read(inode))
 593                 truncate_setsize(inode, iattr->ia_size);
 594
 595         v9fs_invalidate_inode_attr(inode);
 596         setattr_copy(&init_user_ns, inode, iattr);
 597         mark_inode_dirty(inode);
 598         if (iattr->ia_valid & ATTR_MODE) {
 599                 /* We also want to update ACL when we update mode bits */
 600                 retval = v9fs_acl_chmod(inode, fid);
 601                 if (retval < 0) {
 602                         if (use_dentry)
 603                                 p9_client_clunk(fid);
 604                         return retval;
 605                 }
 606         }
 607         if (use_dentry)
 608                 p9_client_clunk(fid);
 609
 610         return 0;
 611 }
 612
 613 /**
 614  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 615  * @stat: stat structure
 616  * @inode: inode to populate
 617  * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
 618  *
 619  */
 620
 621 void
 622 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
 623                       unsigned int flags)
 624 {
 625         umode_t mode;
 626         struct v9fs_inode *v9inode = V9FS_I(inode);
 627
 628         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 629                 inode->i_atime.tv_sec = stat->st_atime_sec;
 630                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 631                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 632                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 633                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 634                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 635                 inode->i_uid = stat->st_uid;
 636                 inode->i_gid = stat->st_gid;
 637                 set_nlink(inode, stat->st_nlink);
 638
 639                 mode = stat->st_mode & S_IALLUGO;
 640                 mode |= inode->i_mode & ~S_IALLUGO;
 641                 inode->i_mode = mode;
 642
 643                 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
 644                         v9fs_i_size_write(inode, stat->st_size);
 645                 inode->i_blocks = stat->st_blocks;
 646         } else {
 647                 if (stat->st_result_mask & P9_STATS_ATIME) {
 648                         inode->i_atime.tv_sec = stat->st_atime_sec;
 649                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 650                 }
 651                 if (stat->st_result_mask & P9_STATS_MTIME) {
 652                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 653                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 654                 }
 655                 if (stat->st_result_mask & P9_STATS_CTIME) {
 656                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 657                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 658                 }
 659                 if (stat->st_result_mask & P9_STATS_UID)
 660                         inode->i_uid = stat->st_uid;
 661                 if (stat->st_result_mask & P9_STATS_GID)
 662                         inode->i_gid = stat->st_gid;
 663                 if (stat->st_result_mask & P9_STATS_NLINK)
 664                         set_nlink(inode, stat->st_nlink);
 665                 if (stat->st_result_mask & P9_STATS_MODE) {
 666                         inode->i_mode = stat->st_mode;
 667                         if ((S_ISBLK(inode->i_mode)) ||
 668                                                 (S_ISCHR(inode->i_mode)))
 669                                 init_special_inode(inode, inode->i_mode,
 670                                                                 inode->i_rdev);
 671                 }
 672                 if (stat->st_result_mask & P9_STATS_RDEV)
 673                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 674                 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
 675                     stat->st_result_mask & P9_STATS_SIZE)
 676                         v9fs_i_size_write(inode, stat->st_size);
 677                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 678                         inode->i_blocks = stat->st_blocks;
 679         }
 680         if (stat->st_result_mask & P9_STATS_GEN)
 681                 inode->i_generation = stat->st_gen;
 682
 683         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 684          * because the inode structure does not have fields for them.
 685          */
 686         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 687 }
 688
 689 static int
 690 v9fs_vfs_symlink_dotl(struct user_namespace *mnt_userns, struct inode *dir,
 691                       struct dentry *dentry, const char *symname)
 692 {
 693         int err;
 694         kgid_t gid;
 695         const unsigned char *name;
 696         struct p9_qid qid;
 697         struct inode *inode;
 698         struct p9_fid *dfid;
 699         struct p9_fid *fid = NULL;
 700         struct v9fs_session_info *v9ses;
 701
 702         name = dentry->d_name.name;
 703         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 704         v9ses = v9fs_inode2v9ses(dir);
 705
 706         dfid = v9fs_parent_fid(dentry);
 707         if (IS_ERR(dfid)) {
 708                 err = PTR_ERR(dfid);
 709                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 710                 return err;
 711         }
 712
 713         gid = v9fs_get_fsgid_for_create(dir);
 714
 715         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 716         err = p9_client_symlink(dfid, name, symname, gid, &qid);
 717
 718         if (err < 0) {
 719                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 720                 goto error;
 721         }
 722
 723         v9fs_invalidate_inode_attr(dir);
 724         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 725                 /* Now walk from the parent so we can get an unopened fid. */
 726                 fid = p9_client_walk(dfid, 1, &name, 1);
 727                 if (IS_ERR(fid)) {
 728                         err = PTR_ERR(fid);
 729                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 730                                  err);
 731                         fid = NULL;
 732                         goto error;
 733                 }
 734
 735                 /* instantiate inode and assign the unopened fid to dentry */
 736                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 737                 if (IS_ERR(inode)) {
 738                         err = PTR_ERR(inode);
 739                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 740                                  err);
 741                         goto error;
 742                 }
 743                 v9fs_fid_add(dentry, fid);
 744                 d_instantiate(dentry, inode);
 745                 fid = NULL;
 746                 err = 0;
 747         } else {
 748                 /* Not in cached mode. No need to populate inode with stat */
 749                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 750                 if (IS_ERR(inode)) {
 751                         err = PTR_ERR(inode);
 752                         goto error;
 753                 }
 754                 d_instantiate(dentry, inode);
 755         }
 756
 757 error:
 758         if (fid)
 759                 p9_client_clunk(fid);
 760
 761         p9_client_clunk(dfid);
 762         return err;
 763 }
 764
 765 /**
 766  * v9fs_vfs_link_dotl - create a hardlink for dotl
 767  * @old_dentry: dentry for file to link to
 768  * @dir: inode destination for new link
 769  * @dentry: dentry for link
 770  *
 771  */
 772
 773 static int
 774 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 775                 struct dentry *dentry)
 776 {
 777         int err;
 778         struct p9_fid *dfid, *oldfid;
 779         struct v9fs_session_info *v9ses;
 780
 781         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
 782                  dir->i_ino, old_dentry, dentry);
 783
 784         v9ses = v9fs_inode2v9ses(dir);
 785         dfid = v9fs_parent_fid(dentry);
 786         if (IS_ERR(dfid))
 787                 return PTR_ERR(dfid);
 788
 789         oldfid = v9fs_fid_lookup(old_dentry);
 790         if (IS_ERR(oldfid)) {
 791                 p9_client_clunk(dfid);
 792                 return PTR_ERR(oldfid);
 793         }
 794
 795         err = p9_client_link(dfid, oldfid, dentry->d_name.name);
 796
 797         p9_client_clunk(dfid);
 798         p9_client_clunk(oldfid);
 799         if (err < 0) {
 800                 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 801                 return err;
 802         }
 803
 804         v9fs_invalidate_inode_attr(dir);
 805         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 806                 /* Get the latest stat info from server. */
 807                 struct p9_fid *fid;
 808                 fid = v9fs_fid_lookup(old_dentry);
 809                 if (IS_ERR(fid))
 810                         return PTR_ERR(fid);
 811
 812                 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
 813                 p9_client_clunk(fid);
 814         }
 815         ihold(d_inode(old_dentry));
 816         d_instantiate(dentry, d_inode(old_dentry));
 817
 818         return err;
 819 }
 820
 821 /**
 822  * v9fs_vfs_mknod_dotl - create a special file
 823  * @dir: inode destination for new link
 824  * @dentry: dentry for file
 825  * @omode: mode for creation
 826  * @rdev: device associated with special file
 827  *
 828  */
 829 static int
 830 v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir,
 831                     struct dentry *dentry, umode_t omode, dev_t rdev)
 832 {
 833         int err;
 834         kgid_t gid;
 835         const unsigned char *name;
 836         umode_t mode;
 837         struct v9fs_session_info *v9ses;
 838         struct p9_fid *fid = NULL, *dfid = NULL;
 839         struct inode *inode;
 840         struct p9_qid qid;
 841         struct posix_acl *dacl = NULL, *pacl = NULL;
 842
 843         p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
 844                  dir->i_ino, dentry, omode,
 845                  MAJOR(rdev), MINOR(rdev));
 846
 847         v9ses = v9fs_inode2v9ses(dir);
 848         dfid = v9fs_parent_fid(dentry);
 849         if (IS_ERR(dfid)) {
 850                 err = PTR_ERR(dfid);
 851                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 852                 dfid = NULL;
 853                 goto error;
 854         }
 855
 856         gid = v9fs_get_fsgid_for_create(dir);
 857         mode = omode;
 858         /* Update mode based on ACL value */
 859         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 860         if (err) {
 861                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 862                          err);
 863                 goto error;
 864         }
 865         name = dentry->d_name.name;
 866
 867         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 868         if (err < 0)
 869                 goto error;
 870
 871         v9fs_invalidate_inode_attr(dir);
 872         fid = p9_client_walk(dfid, 1, &name, 1);
 873         if (IS_ERR(fid)) {
 874                 err = PTR_ERR(fid);
 875                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 876                          err);
 877                 fid = NULL;
 878                 goto error;
 879         }
 880
 881         /* instantiate inode and assign the unopened fid to the dentry */
 882         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 883                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 884                 if (IS_ERR(inode)) {
 885                         err = PTR_ERR(inode);
 886                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 887                                  err);
 888                         goto error;
 889                 }
 890                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 891                 v9fs_fid_add(dentry, fid);
 892                 d_instantiate(dentry, inode);
 893                 fid = NULL;
 894                 err = 0;
 895         } else {
 896                 /*
 897                  * Not in cached mode. No need to populate inode with stat.
 898                  * socket syscall returns a fd, so we need instantiate
 899                  */
 900                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 901                 if (IS_ERR(inode)) {
 902                         err = PTR_ERR(inode);
 903                         goto error;
 904                 }
 905                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 906                 d_instantiate(dentry, inode);
 907         }
 908 error:
 909         if (fid)
 910                 p9_client_clunk(fid);
 911         v9fs_put_acl(dacl, pacl);
 912         p9_client_clunk(dfid);
 913
 914         return err;
 915 }
 916
 917 /**
 918  * v9fs_vfs_get_link_dotl - follow a symlink path
 919  * @dentry: dentry for symlink
 920  * @inode: inode for symlink
 921  * @done: destructor for return value
 922  */
 923
 924 static const char *
 925 v9fs_vfs_get_link_dotl(struct dentry *dentry,
 926                        struct inode *inode,
 927                        struct delayed_call *done)
 928 {
 929         struct p9_fid *fid;
 930         char *target;
 931         int retval;
 932
 933         if (!dentry)
 934                 return ERR_PTR(-ECHILD);
 935
 936         p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
 937
 938         fid = v9fs_fid_lookup(dentry);
 939         if (IS_ERR(fid))
 940                 return ERR_CAST(fid);
 941         retval = p9_client_readlink(fid, &target);
 942         p9_client_clunk(fid);
 943         if (retval)
 944                 return ERR_PTR(retval);
 945         set_delayed_call(done, kfree_link, target);
 946         return target;
 947 }
 948
 949 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 950 {
 951         struct p9_stat_dotl *st;
 952         struct v9fs_session_info *v9ses;
 953         unsigned int flags;
 954
 955         v9ses = v9fs_inode2v9ses(inode);
 956         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 957         if (IS_ERR(st))
 958                 return PTR_ERR(st);
 959         /*
 960          * Don't update inode if the file type is different
 961          */
 962         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 963                 goto out;
 964
 965         /*
 966          * We don't want to refresh inode->i_size,
 967          * because we may have cached data
 968          */
 969         flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
 970                 V9FS_STAT2INODE_KEEP_ISIZE : 0;
 971         v9fs_stat2inode_dotl(st, inode, flags);
 972 out:
 973         kfree(st);
 974         return 0;
 975 }
 976
 977 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 978         .create = v9fs_vfs_create_dotl,
 979         .atomic_open = v9fs_vfs_atomic_open_dotl,
 980         .lookup = v9fs_vfs_lookup,
 981         .link = v9fs_vfs_link_dotl,
 982         .symlink = v9fs_vfs_symlink_dotl,
 983         .unlink = v9fs_vfs_unlink,
 984         .mkdir = v9fs_vfs_mkdir_dotl,
 985         .rmdir = v9fs_vfs_rmdir,
 986         .mknod = v9fs_vfs_mknod_dotl,
 987         .rename = v9fs_vfs_rename,
 988         .getattr = v9fs_vfs_getattr_dotl,
 989         .setattr = v9fs_vfs_setattr_dotl,
 990         .listxattr = v9fs_listxattr,
 991         .get_acl = v9fs_iop_get_acl,
 992 };
 993
 994 const struct inode_operations v9fs_file_inode_operations_dotl = {
 995         .getattr = v9fs_vfs_getattr_dotl,
 996         .setattr = v9fs_vfs_setattr_dotl,
 997         .listxattr = v9fs_listxattr,
 998         .get_acl = v9fs_iop_get_acl,
 999 };
1000
1001 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1002         .get_link = v9fs_vfs_get_link_dotl,
1003         .getattr = v9fs_vfs_getattr_dotl,
1004         .setattr = v9fs_vfs_setattr_dotl,
1005         .listxattr = v9fs_listxattr,
1006 };