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/inet.h>
  17 #include <linux/namei.h>
  18 #include <linux/idr.h>
  19 #include <linux/sched.h>
  20 #include <linux/slab.h>
  21 #include <linux/xattr.h>
  22 #include <linux/posix_acl.h>
  23 #include <net/9p/9p.h>
  24 #include <net/9p/client.h>
  25
  26 #include "v9fs.h"
  27 #include "v9fs_vfs.h"
  28 #include "fid.h"
  29 #include "cache.h"
  30 #include "xattr.h"
  31 #include "acl.h"
  32
  33 static int
  34 v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir,
  35                     struct dentry *dentry, umode_t omode, dev_t rdev);
  36
  37 /**
  38  * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object
  39  * @dir_inode: The directory inode
  40  *
  41  * Helper function to get the gid for creating a
  42  * new file system object. This checks the S_ISGID to determine the owning
  43  * group of the new file system object.
  44  */
  45
  46 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
  47 {
  48         BUG_ON(dir_inode == NULL);
  49
  50         if (dir_inode->i_mode & S_ISGID) {
  51                 /* set_gid bit is set.*/
  52                 return dir_inode->i_gid;
  53         }
  54         return current_fsgid();
  55 }
  56
  57 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
  58 {
  59         struct v9fs_inode *v9inode = V9FS_I(inode);
  60         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
  61
  62         /* don't match inode of different type */
  63         if (inode_wrong_type(inode, st->st_mode))
  64                 return 0;
  65
  66         if (inode->i_generation != st->st_gen)
  67                 return 0;
  68
  69         /* compare qid details */
  70         if (memcmp(&v9inode->qid.version,
  71                    &st->qid.version, sizeof(v9inode->qid.version)))
  72                 return 0;
  73
  74         if (v9inode->qid.type != st->qid.type)
  75                 return 0;
  76
  77         if (v9inode->qid.path != st->qid.path)
  78                 return 0;
  79         return 1;
  80 }
  81
  82 /* Always get a new inode */
  83 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
  84 {
  85         return 0;
  86 }
  87
  88 static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
  89 {
  90         struct v9fs_inode *v9inode = V9FS_I(inode);
  91         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
  92
  93         memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
  94         inode->i_generation = st->st_gen;
  95         return 0;
  96 }
  97
  98 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
  99                                         struct p9_qid *qid,
 100                                         struct p9_fid *fid,
 101                                         struct p9_stat_dotl *st,
 102                                         int new)
 103 {
 104         int retval;
 105         unsigned long i_ino;
 106         struct inode *inode;
 107         struct v9fs_session_info *v9ses = sb->s_fs_info;
 108         int (*test)(struct inode *inode, void *data);
 109
 110         if (new)
 111                 test = v9fs_test_new_inode_dotl;
 112         else
 113                 test = v9fs_test_inode_dotl;
 114
 115         i_ino = v9fs_qid2ino(qid);
 116         inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
 117         if (!inode)
 118                 return ERR_PTR(-ENOMEM);
 119         if (!(inode->i_state & I_NEW))
 120                 return inode;
 121         /*
 122          * initialize the inode with the stat info
 123          * FIXME!! we may need support for stale inodes
 124          * later.
 125          */
 126         inode->i_ino = i_ino;
 127         retval = v9fs_init_inode(v9ses, inode,
 128                                  st->st_mode, new_decode_dev(st->st_rdev));
 129         if (retval)
 130                 goto error;
 131
 132         v9fs_stat2inode_dotl(st, inode, 0);
 133         v9fs_cache_inode_get_cookie(inode);
 134         retval = v9fs_get_acl(inode, fid);
 135         if (retval)
 136                 goto error;
 137
 138         unlock_new_inode(inode);
 139         return inode;
 140 error:
 141         iget_failed(inode);
 142         return ERR_PTR(retval);
 143
 144 }
 145
 146 struct inode *
 147 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 148                          struct super_block *sb, int new)
 149 {
 150         struct p9_stat_dotl *st;
 151         struct inode *inode = NULL;
 152
 153         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
 154         if (IS_ERR(st))
 155                 return ERR_CAST(st);
 156
 157         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
 158         kfree(st);
 159         return inode;
 160 }
 161
 162 struct dotl_openflag_map {
 163         int open_flag;
 164         int dotl_flag;
 165 };
 166
 167 static int v9fs_mapped_dotl_flags(int flags)
 168 {
 169         int i;
 170         int rflags = 0;
 171         struct dotl_openflag_map dotl_oflag_map[] = {
 172                 { O_CREAT,      P9_DOTL_CREATE },
 173                 { O_EXCL,       P9_DOTL_EXCL },
 174                 { O_NOCTTY,     P9_DOTL_NOCTTY },
 175                 { O_APPEND,     P9_DOTL_APPEND },
 176                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
 177                 { O_DSYNC,      P9_DOTL_DSYNC },
 178                 { FASYNC,       P9_DOTL_FASYNC },
 179                 { O_DIRECT,     P9_DOTL_DIRECT },
 180                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
 181                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
 182                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
 183                 { O_NOATIME,    P9_DOTL_NOATIME },
 184                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
 185                 { O_SYNC,       P9_DOTL_SYNC},
 186         };
 187         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
 188                 if (flags & dotl_oflag_map[i].open_flag)
 189                         rflags |= dotl_oflag_map[i].dotl_flag;
 190         }
 191         return rflags;
 192 }
 193
 194 /**
 195  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 196  * plan 9 open flag.
 197  * @flags: flags to convert
 198  */
 199 int v9fs_open_to_dotl_flags(int flags)
 200 {
 201         int rflags = 0;
 202
 203         /*
 204          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
 205          * and P9_DOTL_NOACCESS
 206          */
 207         rflags |= flags & O_ACCMODE;
 208         rflags |= v9fs_mapped_dotl_flags(flags);
 209
 210         return rflags;
 211 }
 212
 213 /**
 214  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 215  * @mnt_userns: The user namespace of the mount
 216  * @dir: directory inode that is being created
 217  * @dentry:  dentry that is being deleted
 218  * @omode: create permissions
 219  * @excl: True if the file must not yet exist
 220  *
 221  */
 222 static int
 223 v9fs_vfs_create_dotl(struct user_namespace *mnt_userns, struct inode *dir,
 224                      struct dentry *dentry, umode_t omode, bool excl)
 225 {
 226         return v9fs_vfs_mknod_dotl(mnt_userns, dir, dentry, omode, 0);
 227 }
 228
 229 static int
 230 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 231                           struct file *file, unsigned int flags, umode_t omode)
 232 {
 233         int err = 0;
 234         kgid_t gid;
 235         umode_t mode;
 236         const unsigned char *name = NULL;
 237         struct p9_qid qid;
 238         struct inode *inode;
 239         struct p9_fid *fid = NULL;
 240         struct v9fs_inode *v9inode;
 241         struct p9_fid *dfid = NULL, *ofid = NULL, *inode_fid = NULL;
 242         struct v9fs_session_info *v9ses;
 243         struct posix_acl *pacl = NULL, *dacl = NULL;
 244         struct dentry *res = NULL;
 245
 246         if (d_in_lookup(dentry)) {
 247                 res = v9fs_vfs_lookup(dir, dentry, 0);
 248                 if (IS_ERR(res))
 249                         return PTR_ERR(res);
 250
 251                 if (res)
 252                         dentry = res;
 253         }
 254
 255         /* Only creates */
 256         if (!(flags & O_CREAT) || d_really_is_positive(dentry))
 257                 return  finish_no_open(file, res);
 258
 259         v9ses = v9fs_inode2v9ses(dir);
 260
 261         name = dentry->d_name.name;
 262         p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
 263                  name, flags, omode);
 264
 265         dfid = v9fs_parent_fid(dentry);
 266         if (IS_ERR(dfid)) {
 267                 err = PTR_ERR(dfid);
 268                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 269                 goto out;
 270         }
 271
 272         /* clone a fid to use for creation */
 273         ofid = clone_fid(dfid);
 274         if (IS_ERR(ofid)) {
 275                 err = PTR_ERR(ofid);
 276                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 277                 goto out;
 278         }
 279
 280         gid = v9fs_get_fsgid_for_create(dir);
 281
 282         mode = omode;
 283         /* Update mode based on ACL value */
 284         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 285         if (err) {
 286                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
 287                          err);
 288                 goto out;
 289         }
 290         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
 291                                     mode, gid, &qid);
 292         if (err < 0) {
 293                 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
 294                          err);
 295                 goto out;
 296         }
 297         v9fs_invalidate_inode_attr(dir);
 298
 299         /* instantiate inode and assign the unopened fid to the dentry */
 300         fid = p9_client_walk(dfid, 1, &name, 1);
 301         if (IS_ERR(fid)) {
 302                 err = PTR_ERR(fid);
 303                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 304                 goto out;
 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 out;
 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 out;
 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 out;
 343         file->private_data = ofid;
 344         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
 345                 fscache_use_cookie(v9fs_inode_cookie(v9inode),
 346                                    file->f_mode & FMODE_WRITE);
 347         v9fs_open_fid_add(inode, &ofid);
 348         file->f_mode |= FMODE_CREATED;
 349 out:
 350         p9_fid_put(dfid);
 351         p9_fid_put(ofid);
 352         p9_fid_put(fid);
 353         v9fs_put_acl(dacl, pacl);
 354         dput(res);
 355         return err;
 356 }
 357
 358 /**
 359  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 360  * @mnt_userns: The user namespace of the mount
 361  * @dir:  inode that is being unlinked
 362  * @dentry: dentry that is being unlinked
 363  * @omode: mode for new directory
 364  *
 365  */
 366
 367 static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns,
 368                                struct inode *dir, struct dentry *dentry,
 369                                umode_t omode)
 370 {
 371         int err;
 372         struct v9fs_session_info *v9ses;
 373         struct p9_fid *fid = NULL, *dfid = NULL;
 374         kgid_t gid;
 375         const unsigned char *name;
 376         umode_t mode;
 377         struct inode *inode;
 378         struct p9_qid qid;
 379         struct posix_acl *dacl = NULL, *pacl = NULL;
 380
 381         p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
 382         err = 0;
 383         v9ses = v9fs_inode2v9ses(dir);
 384
 385         omode |= S_IFDIR;
 386         if (dir->i_mode & S_ISGID)
 387                 omode |= S_ISGID;
 388
 389         dfid = v9fs_parent_fid(dentry);
 390         if (IS_ERR(dfid)) {
 391                 err = PTR_ERR(dfid);
 392                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 393                 goto error;
 394         }
 395
 396         gid = v9fs_get_fsgid_for_create(dir);
 397         mode = omode;
 398         /* Update mode based on ACL value */
 399         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 400         if (err) {
 401                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 402                          err);
 403                 goto error;
 404         }
 405         name = dentry->d_name.name;
 406         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 407         if (err < 0)
 408                 goto error;
 409         fid = p9_client_walk(dfid, 1, &name, 1);
 410         if (IS_ERR(fid)) {
 411                 err = PTR_ERR(fid);
 412                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 413                          err);
 414                 goto error;
 415         }
 416
 417         /* instantiate inode and assign the unopened fid to the dentry */
 418         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 419                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 420                 if (IS_ERR(inode)) {
 421                         err = PTR_ERR(inode);
 422                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 423                                  err);
 424                         goto error;
 425                 }
 426                 v9fs_fid_add(dentry, &fid);
 427                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 428                 d_instantiate(dentry, inode);
 429                 err = 0;
 430         } else {
 431                 /*
 432                  * Not in cached mode. No need to populate
 433                  * inode with stat. We need to get an inode
 434                  * so that we can set the acl with dentry
 435                  */
 436                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 437                 if (IS_ERR(inode)) {
 438                         err = PTR_ERR(inode);
 439                         goto error;
 440                 }
 441                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 442                 d_instantiate(dentry, inode);
 443         }
 444         inc_nlink(dir);
 445         v9fs_invalidate_inode_attr(dir);
 446 error:
 447         p9_fid_put(fid);
 448         v9fs_put_acl(dacl, pacl);
 449         p9_fid_put(dfid);
 450         return err;
 451 }
 452
 453 static int
 454 v9fs_vfs_getattr_dotl(struct user_namespace *mnt_userns,
 455                       const struct path *path, struct kstat *stat,
 456                       u32 request_mask, unsigned int flags)
 457 {
 458         struct dentry *dentry = path->dentry;
 459         struct v9fs_session_info *v9ses;
 460         struct p9_fid *fid;
 461         struct p9_stat_dotl *st;
 462
 463         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 464         v9ses = v9fs_dentry2v9ses(dentry);
 465         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 466                 generic_fillattr(&init_user_ns, d_inode(dentry), stat);
 467                 return 0;
 468         }
 469         fid = v9fs_fid_lookup(dentry);
 470         if (IS_ERR(fid))
 471                 return PTR_ERR(fid);
 472
 473         /* Ask for all the fields in stat structure. Server will return
 474          * whatever it supports
 475          */
 476
 477         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 478         p9_fid_put(fid);
 479         if (IS_ERR(st))
 480                 return PTR_ERR(st);
 481
 482         v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
 483         generic_fillattr(&init_user_ns, d_inode(dentry), stat);
 484         /* Change block size to what the server returned */
 485         stat->blksize = st->st_blksize;
 486
 487         kfree(st);
 488         return 0;
 489 }
 490
 491 /*
 492  * Attribute flags.
 493  */
 494 #define P9_ATTR_MODE            (1 << 0)
 495 #define P9_ATTR_UID             (1 << 1)
 496 #define P9_ATTR_GID             (1 << 2)
 497 #define P9_ATTR_SIZE            (1 << 3)
 498 #define P9_ATTR_ATIME           (1 << 4)
 499 #define P9_ATTR_MTIME           (1 << 5)
 500 #define P9_ATTR_CTIME           (1 << 6)
 501 #define P9_ATTR_ATIME_SET       (1 << 7)
 502 #define P9_ATTR_MTIME_SET       (1 << 8)
 503
 504 struct dotl_iattr_map {
 505         int iattr_valid;
 506         int p9_iattr_valid;
 507 };
 508
 509 static int v9fs_mapped_iattr_valid(int iattr_valid)
 510 {
 511         int i;
 512         int p9_iattr_valid = 0;
 513         struct dotl_iattr_map dotl_iattr_map[] = {
 514                 { ATTR_MODE,            P9_ATTR_MODE },
 515                 { ATTR_UID,             P9_ATTR_UID },
 516                 { ATTR_GID,             P9_ATTR_GID },
 517                 { ATTR_SIZE,            P9_ATTR_SIZE },
 518                 { ATTR_ATIME,           P9_ATTR_ATIME },
 519                 { ATTR_MTIME,           P9_ATTR_MTIME },
 520                 { ATTR_CTIME,           P9_ATTR_CTIME },
 521                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 522                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 523         };
 524         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 525                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 526                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 527         }
 528         return p9_iattr_valid;
 529 }
 530
 531 /**
 532  * v9fs_vfs_setattr_dotl - set file metadata
 533  * @mnt_userns: The user namespace of the mount
 534  * @dentry: file whose metadata to set
 535  * @iattr: metadata assignment structure
 536  *
 537  */
 538
 539 int v9fs_vfs_setattr_dotl(struct user_namespace *mnt_userns,
 540                           struct dentry *dentry, struct iattr *iattr)
 541 {
 542         int retval, use_dentry = 0;
 543         struct p9_fid *fid = NULL;
 544         struct p9_iattr_dotl p9attr = {
 545                 .uid = INVALID_UID,
 546                 .gid = INVALID_GID,
 547         };
 548         struct inode *inode = d_inode(dentry);
 549
 550         p9_debug(P9_DEBUG_VFS, "\n");
 551
 552         retval = setattr_prepare(&init_user_ns, dentry, iattr);
 553         if (retval)
 554                 return retval;
 555
 556         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 557         if (iattr->ia_valid & ATTR_MODE)
 558                 p9attr.mode = iattr->ia_mode;
 559         if (iattr->ia_valid & ATTR_UID)
 560                 p9attr.uid = iattr->ia_uid;
 561         if (iattr->ia_valid & ATTR_GID)
 562                 p9attr.gid = iattr->ia_gid;
 563         if (iattr->ia_valid & ATTR_SIZE)
 564                 p9attr.size = iattr->ia_size;
 565         if (iattr->ia_valid & ATTR_ATIME_SET) {
 566                 p9attr.atime_sec = iattr->ia_atime.tv_sec;
 567                 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 568         }
 569         if (iattr->ia_valid & ATTR_MTIME_SET) {
 570                 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 571                 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 572         }
 573
 574         if (iattr->ia_valid & ATTR_FILE) {
 575                 fid = iattr->ia_file->private_data;
 576                 WARN_ON(!fid);
 577         }
 578         if (!fid) {
 579                 fid = v9fs_fid_lookup(dentry);
 580                 use_dentry = 1;
 581         }
 582         if (IS_ERR(fid))
 583                 return PTR_ERR(fid);
 584
 585         /* Write all dirty data */
 586         if (S_ISREG(inode->i_mode))
 587                 filemap_write_and_wait(inode->i_mapping);
 588
 589         retval = p9_client_setattr(fid, &p9attr);
 590         if (retval < 0) {
 591                 if (use_dentry)
 592                         p9_fid_put(fid);
 593                 return retval;
 594         }
 595
 596         if ((iattr->ia_valid & ATTR_SIZE) &&
 597             iattr->ia_size != i_size_read(inode))
 598                 truncate_setsize(inode, iattr->ia_size);
 599
 600         v9fs_invalidate_inode_attr(inode);
 601         setattr_copy(&init_user_ns, inode, iattr);
 602         mark_inode_dirty(inode);
 603         if (iattr->ia_valid & ATTR_MODE) {
 604                 /* We also want to update ACL when we update mode bits */
 605                 retval = v9fs_acl_chmod(inode, fid);
 606                 if (retval < 0) {
 607                         if (use_dentry)
 608                                 p9_fid_put(fid);
 609                         return retval;
 610                 }
 611         }
 612         if (use_dentry)
 613                 p9_fid_put(fid);
 614
 615         return 0;
 616 }
 617
 618 /**
 619  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 620  * @stat: stat structure
 621  * @inode: inode to populate
 622  * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
 623  *
 624  */
 625
 626 void
 627 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
 628                       unsigned int flags)
 629 {
 630         umode_t mode;
 631         struct v9fs_inode *v9inode = V9FS_I(inode);
 632
 633         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 634                 inode->i_atime.tv_sec = stat->st_atime_sec;
 635                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 636                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 637                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 638                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 639                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 640                 inode->i_uid = stat->st_uid;
 641                 inode->i_gid = stat->st_gid;
 642                 set_nlink(inode, stat->st_nlink);
 643
 644                 mode = stat->st_mode & S_IALLUGO;
 645                 mode |= inode->i_mode & ~S_IALLUGO;
 646                 inode->i_mode = mode;
 647
 648                 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
 649                         v9fs_i_size_write(inode, stat->st_size);
 650                 inode->i_blocks = stat->st_blocks;
 651         } else {
 652                 if (stat->st_result_mask & P9_STATS_ATIME) {
 653                         inode->i_atime.tv_sec = stat->st_atime_sec;
 654                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 655                 }
 656                 if (stat->st_result_mask & P9_STATS_MTIME) {
 657                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 658                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 659                 }
 660                 if (stat->st_result_mask & P9_STATS_CTIME) {
 661                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 662                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 663                 }
 664                 if (stat->st_result_mask & P9_STATS_UID)
 665                         inode->i_uid = stat->st_uid;
 666                 if (stat->st_result_mask & P9_STATS_GID)
 667                         inode->i_gid = stat->st_gid;
 668                 if (stat->st_result_mask & P9_STATS_NLINK)
 669                         set_nlink(inode, stat->st_nlink);
 670                 if (stat->st_result_mask & P9_STATS_MODE) {
 671                         mode = stat->st_mode & S_IALLUGO;
 672                         mode |= inode->i_mode & ~S_IALLUGO;
 673                         inode->i_mode = mode;
 674                 }
 675                 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
 676                     stat->st_result_mask & P9_STATS_SIZE)
 677                         v9fs_i_size_write(inode, stat->st_size);
 678                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 679                         inode->i_blocks = stat->st_blocks;
 680         }
 681         if (stat->st_result_mask & P9_STATS_GEN)
 682                 inode->i_generation = stat->st_gen;
 683
 684         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 685          * because the inode structure does not have fields for them.
 686          */
 687         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 688 }
 689
 690 static int
 691 v9fs_vfs_symlink_dotl(struct user_namespace *mnt_userns, struct inode *dir,
 692                       struct dentry *dentry, const char *symname)
 693 {
 694         int err;
 695         kgid_t gid;
 696         const unsigned char *name;
 697         struct p9_qid qid;
 698         struct inode *inode;
 699         struct p9_fid *dfid;
 700         struct p9_fid *fid = NULL;
 701         struct v9fs_session_info *v9ses;
 702
 703         name = dentry->d_name.name;
 704         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 705         v9ses = v9fs_inode2v9ses(dir);
 706
 707         dfid = v9fs_parent_fid(dentry);
 708         if (IS_ERR(dfid)) {
 709                 err = PTR_ERR(dfid);
 710                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 711                 return err;
 712         }
 713
 714         gid = v9fs_get_fsgid_for_create(dir);
 715
 716         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 717         err = p9_client_symlink(dfid, name, symname, gid, &qid);
 718
 719         if (err < 0) {
 720                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 721                 goto error;
 722         }
 723
 724         v9fs_invalidate_inode_attr(dir);
 725         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 726                 /* Now walk from the parent so we can get an unopened fid. */
 727                 fid = p9_client_walk(dfid, 1, &name, 1);
 728                 if (IS_ERR(fid)) {
 729                         err = PTR_ERR(fid);
 730                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 731                                  err);
 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                 err = 0;
 746         } else {
 747                 /* Not in cached mode. No need to populate inode with stat */
 748                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 749                 if (IS_ERR(inode)) {
 750                         err = PTR_ERR(inode);
 751                         goto error;
 752                 }
 753                 d_instantiate(dentry, inode);
 754         }
 755
 756 error:
 757         p9_fid_put(fid);
 758         p9_fid_put(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_fid_put(dfid);
 789                 return PTR_ERR(oldfid);
 790         }
 791
 792         err = p9_client_link(dfid, oldfid, dentry->d_name.name);
 793
 794         p9_fid_put(dfid);
 795         p9_fid_put(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
 806                 fid = v9fs_fid_lookup(old_dentry);
 807                 if (IS_ERR(fid))
 808                         return PTR_ERR(fid);
 809
 810                 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
 811                 p9_fid_put(fid);
 812         }
 813         ihold(d_inode(old_dentry));
 814         d_instantiate(dentry, d_inode(old_dentry));
 815
 816         return err;
 817 }
 818
 819 /**
 820  * v9fs_vfs_mknod_dotl - create a special file
 821  * @mnt_userns: The user namespace of the mount
 822  * @dir: inode destination for new link
 823  * @dentry: dentry for file
 824  * @omode: mode for creation
 825  * @rdev: device associated with special file
 826  *
 827  */
 828 static int
 829 v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir,
 830                     struct dentry *dentry, umode_t omode, dev_t rdev)
 831 {
 832         int err;
 833         kgid_t gid;
 834         const unsigned char *name;
 835         umode_t mode;
 836         struct v9fs_session_info *v9ses;
 837         struct p9_fid *fid = NULL, *dfid = NULL;
 838         struct inode *inode;
 839         struct p9_qid qid;
 840         struct posix_acl *dacl = NULL, *pacl = NULL;
 841
 842         p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
 843                  dir->i_ino, dentry, omode,
 844                  MAJOR(rdev), MINOR(rdev));
 845
 846         v9ses = v9fs_inode2v9ses(dir);
 847         dfid = v9fs_parent_fid(dentry);
 848         if (IS_ERR(dfid)) {
 849                 err = PTR_ERR(dfid);
 850                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 851                 goto error;
 852         }
 853
 854         gid = v9fs_get_fsgid_for_create(dir);
 855         mode = omode;
 856         /* Update mode based on ACL value */
 857         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 858         if (err) {
 859                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 860                          err);
 861                 goto error;
 862         }
 863         name = dentry->d_name.name;
 864
 865         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 866         if (err < 0)
 867                 goto error;
 868
 869         v9fs_invalidate_inode_attr(dir);
 870         fid = p9_client_walk(dfid, 1, &name, 1);
 871         if (IS_ERR(fid)) {
 872                 err = PTR_ERR(fid);
 873                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 874                          err);
 875                 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                 err = 0;
 891         } else {
 892                 /*
 893                  * Not in cached mode. No need to populate inode with stat.
 894                  * socket syscall returns a fd, so we need instantiate
 895                  */
 896                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 897                 if (IS_ERR(inode)) {
 898                         err = PTR_ERR(inode);
 899                         goto error;
 900                 }
 901                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 902                 d_instantiate(dentry, inode);
 903         }
 904 error:
 905         p9_fid_put(fid);
 906         v9fs_put_acl(dacl, pacl);
 907         p9_fid_put(dfid);
 908
 909         return err;
 910 }
 911
 912 /**
 913  * v9fs_vfs_get_link_dotl - follow a symlink path
 914  * @dentry: dentry for symlink
 915  * @inode: inode for symlink
 916  * @done: destructor for return value
 917  */
 918
 919 static const char *
 920 v9fs_vfs_get_link_dotl(struct dentry *dentry,
 921                        struct inode *inode,
 922                        struct delayed_call *done)
 923 {
 924         struct p9_fid *fid;
 925         char *target;
 926         int retval;
 927
 928         if (!dentry)
 929                 return ERR_PTR(-ECHILD);
 930
 931         p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
 932
 933         fid = v9fs_fid_lookup(dentry);
 934         if (IS_ERR(fid))
 935                 return ERR_CAST(fid);
 936         retval = p9_client_readlink(fid, &target);
 937         p9_fid_put(fid);
 938         if (retval)
 939                 return ERR_PTR(retval);
 940         set_delayed_call(done, kfree_link, target);
 941         return target;
 942 }
 943
 944 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 945 {
 946         struct p9_stat_dotl *st;
 947         struct v9fs_session_info *v9ses;
 948         unsigned int flags;
 949
 950         v9ses = v9fs_inode2v9ses(inode);
 951         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 952         if (IS_ERR(st))
 953                 return PTR_ERR(st);
 954         /*
 955          * Don't update inode if the file type is different
 956          */
 957         if (inode_wrong_type(inode, st->st_mode))
 958                 goto out;
 959
 960         /*
 961          * We don't want to refresh inode->i_size,
 962          * because we may have cached data
 963          */
 964         flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
 965                 V9FS_STAT2INODE_KEEP_ISIZE : 0;
 966         v9fs_stat2inode_dotl(st, inode, flags);
 967 out:
 968         kfree(st);
 969         return 0;
 970 }
 971
 972 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 973         .create = v9fs_vfs_create_dotl,
 974         .atomic_open = v9fs_vfs_atomic_open_dotl,
 975         .lookup = v9fs_vfs_lookup,
 976         .link = v9fs_vfs_link_dotl,
 977         .symlink = v9fs_vfs_symlink_dotl,
 978         .unlink = v9fs_vfs_unlink,
 979         .mkdir = v9fs_vfs_mkdir_dotl,
 980         .rmdir = v9fs_vfs_rmdir,
 981         .mknod = v9fs_vfs_mknod_dotl,
 982         .rename = v9fs_vfs_rename,
 983         .getattr = v9fs_vfs_getattr_dotl,
 984         .setattr = v9fs_vfs_setattr_dotl,
 985         .listxattr = v9fs_listxattr,
 986         .get_acl = v9fs_iop_get_acl,
 987 };
 988
 989 const struct inode_operations v9fs_file_inode_operations_dotl = {
 990         .getattr = v9fs_vfs_getattr_dotl,
 991         .setattr = v9fs_vfs_setattr_dotl,
 992         .listxattr = v9fs_listxattr,
 993         .get_acl = v9fs_iop_get_acl,
 994 };
 995
 996 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 997         .get_link = v9fs_vfs_get_link_dotl,
 998         .getattr = v9fs_vfs_getattr_dotl,
 999         .setattr = v9fs_vfs_setattr_dotl,
1000         .listxattr = v9fs_listxattr,
1001 };