fs/ksmbd/vfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   Copyright (C) 2016 Namjae Jeon <[email protected]>
   4  *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/fs.h>
   9 #include <linux/uaccess.h>
  10 #include <linux/backing-dev.h>
  11 #include <linux/writeback.h>
  12 #include <linux/xattr.h>
  13 #include <linux/falloc.h>
  14 #include <linux/fsnotify.h>
  15 #include <linux/dcache.h>
  16 #include <linux/slab.h>
  17 #include <linux/vmalloc.h>
  18 #include <linux/sched/xacct.h>
  19 #include <linux/crc32c.h>
  20
  21 #include "../internal.h"        /* for vfs_path_lookup */
  22
  23 #include "glob.h"
  24 #include "oplock.h"
  25 #include "connection.h"
  26 #include "vfs.h"
  27 #include "vfs_cache.h"
  28 #include "smbacl.h"
  29 #include "ndr.h"
  30 #include "auth.h"
  31 #include "misc.h"
  32
  33 #include "smb_common.h"
  34 #include "mgmt/share_config.h"
  35 #include "mgmt/tree_connect.h"
  36 #include "mgmt/user_session.h"
  37 #include "mgmt/user_config.h"
  38
  39 static char *extract_last_component(char *path)
  40 {
  41         char *p = strrchr(path, '/');
  42
  43         if (p && p[1] != '\0') {
  44                 *p = '\0';
  45                 p++;
  46         } else {
  47                 p = NULL;
  48         }
  49         return p;
  50 }
  51
  52 static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work,
  53                                     struct inode *parent_inode,
  54                                     struct inode *inode)
  55 {
  56         if (!test_share_config_flag(work->tcon->share_conf,
  57                                     KSMBD_SHARE_FLAG_INHERIT_OWNER))
  58                 return;
  59
  60         i_uid_write(inode, i_uid_read(parent_inode));
  61 }
  62
  63 /**
  64  * ksmbd_vfs_lock_parent() - lock parent dentry if it is stable
  65  *
  66  * the parent dentry got by dget_parent or @parent could be
  67  * unstable, we try to lock a parent inode and lookup the
  68  * child dentry again.
  69  *
  70  * the reference count of @parent isn't incremented.
  71  */
  72 int ksmbd_vfs_lock_parent(struct user_namespace *user_ns, struct dentry *parent,
  73                           struct dentry *child)
  74 {
  75         struct dentry *dentry;
  76         int ret = 0;
  77
  78         inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
  79         dentry = lookup_one(user_ns, child->d_name.name, parent,
  80                             child->d_name.len);
  81         if (IS_ERR(dentry)) {
  82                 ret = PTR_ERR(dentry);
  83                 goto out_err;
  84         }
  85
  86         if (dentry != child) {
  87                 ret = -ESTALE;
  88                 dput(dentry);
  89                 goto out_err;
  90         }
  91
  92         dput(dentry);
  93         return 0;
  94 out_err:
  95         inode_unlock(d_inode(parent));
  96         return ret;
  97 }
  98
  99 int ksmbd_vfs_may_delete(struct user_namespace *user_ns,
 100                          struct dentry *dentry)
 101 {
 102         struct dentry *parent;
 103         int ret;
 104
 105         parent = dget_parent(dentry);
 106         ret = ksmbd_vfs_lock_parent(user_ns, parent, dentry);
 107         if (ret) {
 108                 dput(parent);
 109                 return ret;
 110         }
 111
 112         ret = inode_permission(user_ns, d_inode(parent),
 113                                MAY_EXEC | MAY_WRITE);
 114
 115         inode_unlock(d_inode(parent));
 116         dput(parent);
 117         return ret;
 118 }
 119
 120 int ksmbd_vfs_query_maximal_access(struct user_namespace *user_ns,
 121                                    struct dentry *dentry, __le32 *daccess)
 122 {
 123         struct dentry *parent;
 124         int ret = 0;
 125
 126         *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
 127
 128         if (!inode_permission(user_ns, d_inode(dentry), MAY_OPEN | MAY_WRITE))
 129                 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
 130                                 FILE_WRITE_DATA | FILE_APPEND_DATA |
 131                                 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
 132                                 FILE_DELETE_CHILD);
 133
 134         if (!inode_permission(user_ns, d_inode(dentry), MAY_OPEN | MAY_READ))
 135                 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
 136
 137         if (!inode_permission(user_ns, d_inode(dentry), MAY_OPEN | MAY_EXEC))
 138                 *daccess |= FILE_EXECUTE_LE;
 139
 140         parent = dget_parent(dentry);
 141         ret = ksmbd_vfs_lock_parent(user_ns, parent, dentry);
 142         if (ret) {
 143                 dput(parent);
 144                 return ret;
 145         }
 146
 147         if (!inode_permission(user_ns, d_inode(parent), MAY_EXEC | MAY_WRITE))
 148                 *daccess |= FILE_DELETE_LE;
 149
 150         inode_unlock(d_inode(parent));
 151         dput(parent);
 152         return ret;
 153 }
 154
 155 /**
 156  * ksmbd_vfs_create() - vfs helper for smb create file
 157  * @work:       work
 158  * @name:       file name that is relative to share
 159  * @mode:       file create mode
 160  *
 161  * Return:      0 on success, otherwise error
 162  */
 163 int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
 164 {
 165         struct path path;
 166         struct dentry *dentry;
 167         int err;
 168
 169         dentry = ksmbd_vfs_kern_path_create(work, name,
 170                                             LOOKUP_NO_SYMLINKS, &path);
 171         if (IS_ERR(dentry)) {
 172                 err = PTR_ERR(dentry);
 173                 if (err != -ENOENT)
 174                         pr_err("path create failed for %s, err %d\n",
 175                                name, err);
 176                 return err;
 177         }
 178
 179         mode |= S_IFREG;
 180         err = vfs_create(mnt_user_ns(path.mnt), d_inode(path.dentry),
 181                          dentry, mode, true);
 182         if (!err) {
 183                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
 184                                         d_inode(dentry));
 185         } else {
 186                 pr_err("File(%s): creation failed (err:%d)\n", name, err);
 187         }
 188         done_path_create(&path, dentry);
 189         return err;
 190 }
 191
 192 /**
 193  * ksmbd_vfs_mkdir() - vfs helper for smb create directory
 194  * @work:       work
 195  * @name:       directory name that is relative to share
 196  * @mode:       directory create mode
 197  *
 198  * Return:      0 on success, otherwise error
 199  */
 200 int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
 201 {
 202         struct user_namespace *user_ns;
 203         struct path path;
 204         struct dentry *dentry;
 205         int err;
 206
 207         dentry = ksmbd_vfs_kern_path_create(work, name,
 208                                             LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
 209                                             &path);
 210         if (IS_ERR(dentry)) {
 211                 err = PTR_ERR(dentry);
 212                 if (err != -EEXIST)
 213                         ksmbd_debug(VFS, "path create failed for %s, err %d\n",
 214                                     name, err);
 215                 return err;
 216         }
 217
 218         user_ns = mnt_user_ns(path.mnt);
 219         mode |= S_IFDIR;
 220         err = vfs_mkdir(user_ns, d_inode(path.dentry), dentry, mode);
 221         if (err) {
 222                 goto out;
 223         } else if (d_unhashed(dentry)) {
 224                 struct dentry *d;
 225
 226                 d = lookup_one(user_ns, dentry->d_name.name, dentry->d_parent,
 227                                dentry->d_name.len);
 228                 if (IS_ERR(d)) {
 229                         err = PTR_ERR(d);
 230                         goto out;
 231                 }
 232                 if (unlikely(d_is_negative(d))) {
 233                         dput(d);
 234                         err = -ENOENT;
 235                         goto out;
 236                 }
 237
 238                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
 239                 dput(d);
 240         }
 241 out:
 242         done_path_create(&path, dentry);
 243         if (err)
 244                 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err);
 245         return err;
 246 }
 247
 248 static ssize_t ksmbd_vfs_getcasexattr(struct user_namespace *user_ns,
 249                                       struct dentry *dentry, char *attr_name,
 250                                       int attr_name_len, char **attr_value)
 251 {
 252         char *name, *xattr_list = NULL;
 253         ssize_t value_len = -ENOENT, xattr_list_len;
 254
 255         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
 256         if (xattr_list_len <= 0)
 257                 goto out;
 258
 259         for (name = xattr_list; name - xattr_list < xattr_list_len;
 260                         name += strlen(name) + 1) {
 261                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
 262                 if (strncasecmp(attr_name, name, attr_name_len))
 263                         continue;
 264
 265                 value_len = ksmbd_vfs_getxattr(user_ns,
 266                                                dentry,
 267                                                name,
 268                                                attr_value);
 269                 if (value_len < 0)
 270                         pr_err("failed to get xattr in file\n");
 271                 break;
 272         }
 273
 274 out:
 275         kvfree(xattr_list);
 276         return value_len;
 277 }
 278
 279 static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
 280                                  size_t count)
 281 {
 282         ssize_t v_len;
 283         char *stream_buf = NULL;
 284
 285         ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
 286                     *pos, count);
 287
 288         v_len = ksmbd_vfs_getcasexattr(file_mnt_user_ns(fp->filp),
 289                                        fp->filp->f_path.dentry,
 290                                        fp->stream.name,
 291                                        fp->stream.size,
 292                                        &stream_buf);
 293         if ((int)v_len <= 0)
 294                 return (int)v_len;
 295
 296         if (v_len <= *pos) {
 297                 count = -EINVAL;
 298                 goto free_buf;
 299         }
 300
 301         if (v_len - *pos < count)
 302                 count = v_len - *pos;
 303
 304         memcpy(buf, &stream_buf[*pos], count);
 305
 306 free_buf:
 307         kvfree(stream_buf);
 308         return count;
 309 }
 310
 311 /**
 312  * check_lock_range() - vfs helper for smb byte range file locking
 313  * @filp:       the file to apply the lock to
 314  * @start:      lock start byte offset
 315  * @end:        lock end byte offset
 316  * @type:       byte range type read/write
 317  *
 318  * Return:      0 on success, otherwise error
 319  */
 320 static int check_lock_range(struct file *filp, loff_t start, loff_t end,
 321                             unsigned char type)
 322 {
 323         struct file_lock *flock;
 324         struct file_lock_context *ctx = file_inode(filp)->i_flctx;
 325         int error = 0;
 326
 327         if (!ctx || list_empty_careful(&ctx->flc_posix))
 328                 return 0;
 329
 330         spin_lock(&ctx->flc_lock);
 331         list_for_each_entry(flock, &ctx->flc_posix, fl_list) {
 332                 /* check conflict locks */
 333                 if (flock->fl_end >= start && end >= flock->fl_start) {
 334                         if (flock->fl_type == F_RDLCK) {
 335                                 if (type == WRITE) {
 336                                         pr_err("not allow write by shared lock\n");
 337                                         error = 1;
 338                                         goto out;
 339                                 }
 340                         } else if (flock->fl_type == F_WRLCK) {
 341                                 /* check owner in lock */
 342                                 if (flock->fl_file != filp) {
 343                                         error = 1;
 344                                         pr_err("not allow rw access by exclusive lock from other opens\n");
 345                                         goto out;
 346                                 }
 347                         }
 348                 }
 349         }
 350 out:
 351         spin_unlock(&ctx->flc_lock);
 352         return error;
 353 }
 354
 355 /**
 356  * ksmbd_vfs_read() - vfs helper for smb file read
 357  * @work:       smb work
 358  * @fid:        file id of open file
 359  * @count:      read byte count
 360  * @pos:        file pos
 361  *
 362  * Return:      number of read bytes on success, otherwise error
 363  */
 364 int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count,
 365                    loff_t *pos)
 366 {
 367         struct file *filp = fp->filp;
 368         ssize_t nbytes = 0;
 369         char *rbuf = work->aux_payload_buf;
 370         struct inode *inode = file_inode(filp);
 371
 372         if (S_ISDIR(inode->i_mode))
 373                 return -EISDIR;
 374
 375         if (unlikely(count == 0))
 376                 return 0;
 377
 378         if (work->conn->connection_type) {
 379                 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
 380                         pr_err("no right to read(%pd)\n",
 381                                fp->filp->f_path.dentry);
 382                         return -EACCES;
 383                 }
 384         }
 385
 386         if (ksmbd_stream_fd(fp))
 387                 return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
 388
 389         if (!work->tcon->posix_extensions) {
 390                 int ret;
 391
 392                 ret = check_lock_range(filp, *pos, *pos + count - 1, READ);
 393                 if (ret) {
 394                         pr_err("unable to read due to lock\n");
 395                         return -EAGAIN;
 396                 }
 397         }
 398
 399         nbytes = kernel_read(filp, rbuf, count, pos);
 400         if (nbytes < 0) {
 401                 pr_err("smb read failed, err = %zd\n", nbytes);
 402                 return nbytes;
 403         }
 404
 405         filp->f_pos = *pos;
 406         return nbytes;
 407 }
 408
 409 static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
 410                                   size_t count)
 411 {
 412         char *stream_buf = NULL, *wbuf;
 413         struct user_namespace *user_ns = file_mnt_user_ns(fp->filp);
 414         size_t size, v_len;
 415         int err = 0;
 416
 417         ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
 418                     *pos, count);
 419
 420         size = *pos + count;
 421         if (size > XATTR_SIZE_MAX) {
 422                 size = XATTR_SIZE_MAX;
 423                 count = (*pos + count) - XATTR_SIZE_MAX;
 424         }
 425
 426         v_len = ksmbd_vfs_getcasexattr(user_ns,
 427                                        fp->filp->f_path.dentry,
 428                                        fp->stream.name,
 429                                        fp->stream.size,
 430                                        &stream_buf);
 431         if ((int)v_len < 0) {
 432                 pr_err("not found stream in xattr : %zd\n", v_len);
 433                 err = (int)v_len;
 434                 goto out;
 435         }
 436
 437         if (v_len < size) {
 438                 wbuf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
 439                 if (!wbuf) {
 440                         err = -ENOMEM;
 441                         goto out;
 442                 }
 443
 444                 if (v_len > 0)
 445                         memcpy(wbuf, stream_buf, v_len);
 446                 kvfree(stream_buf);
 447                 stream_buf = wbuf;
 448         }
 449
 450         memcpy(&stream_buf[*pos], buf, count);
 451
 452         err = ksmbd_vfs_setxattr(user_ns,
 453                                  fp->filp->f_path.dentry,
 454                                  fp->stream.name,
 455                                  (void *)stream_buf,
 456                                  size,
 457                                  0);
 458         if (err < 0)
 459                 goto out;
 460
 461         fp->filp->f_pos = *pos;
 462         err = 0;
 463 out:
 464         kvfree(stream_buf);
 465         return err;
 466 }
 467
 468 /**
 469  * ksmbd_vfs_write() - vfs helper for smb file write
 470  * @work:       work
 471  * @fid:        file id of open file
 472  * @buf:        buf containing data for writing
 473  * @count:      read byte count
 474  * @pos:        file pos
 475  * @sync:       fsync after write
 476  * @written:    number of bytes written
 477  *
 478  * Return:      0 on success, otherwise error
 479  */
 480 int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
 481                     char *buf, size_t count, loff_t *pos, bool sync,
 482                     ssize_t *written)
 483 {
 484         struct file *filp;
 485         loff_t  offset = *pos;
 486         int err = 0;
 487
 488         if (work->conn->connection_type) {
 489                 if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
 490                         pr_err("no right to write(%pd)\n",
 491                                fp->filp->f_path.dentry);
 492                         err = -EACCES;
 493                         goto out;
 494                 }
 495         }
 496
 497         filp = fp->filp;
 498
 499         if (ksmbd_stream_fd(fp)) {
 500                 err = ksmbd_vfs_stream_write(fp, buf, pos, count);
 501                 if (!err)
 502                         *written = count;
 503                 goto out;
 504         }
 505
 506         if (!work->tcon->posix_extensions) {
 507                 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
 508                 if (err) {
 509                         pr_err("unable to write due to lock\n");
 510                         err = -EAGAIN;
 511                         goto out;
 512                 }
 513         }
 514
 515         /* Do we need to break any of a levelII oplock? */
 516         smb_break_all_levII_oplock(work, fp, 1);
 517
 518         err = kernel_write(filp, buf, count, pos);
 519         if (err < 0) {
 520                 ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
 521                 goto out;
 522         }
 523
 524         filp->f_pos = *pos;
 525         *written = err;
 526         err = 0;
 527         if (sync) {
 528                 err = vfs_fsync_range(filp, offset, offset + *written, 0);
 529                 if (err < 0)
 530                         pr_err("fsync failed for filename = %pd, err = %d\n",
 531                                fp->filp->f_path.dentry, err);
 532         }
 533
 534 out:
 535         return err;
 536 }
 537
 538 /**
 539  * ksmbd_vfs_getattr() - vfs helper for smb getattr
 540  * @work:       work
 541  * @fid:        file id of open file
 542  * @attrs:      inode attributes
 543  *
 544  * Return:      0 on success, otherwise error
 545  */
 546 int ksmbd_vfs_getattr(struct path *path, struct kstat *stat)
 547 {
 548         int err;
 549
 550         err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
 551         if (err)
 552                 pr_err("getattr failed, err %d\n", err);
 553         return err;
 554 }
 555
 556 /**
 557  * ksmbd_vfs_fsync() - vfs helper for smb fsync
 558  * @work:       work
 559  * @fid:        file id of open file
 560  *
 561  * Return:      0 on success, otherwise error
 562  */
 563 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
 564 {
 565         struct ksmbd_file *fp;
 566         int err;
 567
 568         fp = ksmbd_lookup_fd_slow(work, fid, p_id);
 569         if (!fp) {
 570                 pr_err("failed to get filp for fid %llu\n", fid);
 571                 return -ENOENT;
 572         }
 573         err = vfs_fsync(fp->filp, 0);
 574         if (err < 0)
 575                 pr_err("smb fsync failed, err = %d\n", err);
 576         ksmbd_fd_put(work, fp);
 577         return err;
 578 }
 579
 580 /**
 581  * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
 582  * @name:       directory or file name that is relative to share
 583  *
 584  * Return:      0 on success, otherwise error
 585  */
 586 int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name)
 587 {
 588         struct user_namespace *user_ns;
 589         struct path path;
 590         struct dentry *parent;
 591         int err;
 592
 593         if (ksmbd_override_fsids(work))
 594                 return -ENOMEM;
 595
 596         err = ksmbd_vfs_kern_path(work, name, LOOKUP_NO_SYMLINKS, &path, false);
 597         if (err) {
 598                 ksmbd_debug(VFS, "can't get %s, err %d\n", name, err);
 599                 ksmbd_revert_fsids(work);
 600                 return err;
 601         }
 602
 603         user_ns = mnt_user_ns(path.mnt);
 604         parent = dget_parent(path.dentry);
 605         err = ksmbd_vfs_lock_parent(user_ns, parent, path.dentry);
 606         if (err) {
 607                 dput(parent);
 608                 path_put(&path);
 609                 ksmbd_revert_fsids(work);
 610                 return err;
 611         }
 612
 613         if (!d_inode(path.dentry)->i_nlink) {
 614                 err = -ENOENT;
 615                 goto out_err;
 616         }
 617
 618         if (S_ISDIR(d_inode(path.dentry)->i_mode)) {
 619                 err = vfs_rmdir(user_ns, d_inode(parent), path.dentry);
 620                 if (err && err != -ENOTEMPTY)
 621                         ksmbd_debug(VFS, "%s: rmdir failed, err %d\n", name,
 622                                     err);
 623         } else {
 624                 err = vfs_unlink(user_ns, d_inode(parent), path.dentry, NULL);
 625                 if (err)
 626                         ksmbd_debug(VFS, "%s: unlink failed, err %d\n", name,
 627                                     err);
 628         }
 629
 630 out_err:
 631         inode_unlock(d_inode(parent));
 632         dput(parent);
 633         path_put(&path);
 634         ksmbd_revert_fsids(work);
 635         return err;
 636 }
 637
 638 /**
 639  * ksmbd_vfs_link() - vfs helper for creating smb hardlink
 640  * @oldname:    source file name
 641  * @newname:    hardlink name that is relative to share
 642  *
 643  * Return:      0 on success, otherwise error
 644  */
 645 int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
 646                    const char *newname)
 647 {
 648         struct path oldpath, newpath;
 649         struct dentry *dentry;
 650         int err;
 651
 652         if (ksmbd_override_fsids(work))
 653                 return -ENOMEM;
 654
 655         err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
 656         if (err) {
 657                 pr_err("cannot get linux path for %s, err = %d\n",
 658                        oldname, err);
 659                 goto out1;
 660         }
 661
 662         dentry = ksmbd_vfs_kern_path_create(work, newname,
 663                                             LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
 664                                             &newpath);
 665         if (IS_ERR(dentry)) {
 666                 err = PTR_ERR(dentry);
 667                 pr_err("path create err for %s, err %d\n", newname, err);
 668                 goto out2;
 669         }
 670
 671         err = -EXDEV;
 672         if (oldpath.mnt != newpath.mnt) {
 673                 pr_err("vfs_link failed err %d\n", err);
 674                 goto out3;
 675         }
 676
 677         err = vfs_link(oldpath.dentry, mnt_user_ns(newpath.mnt),
 678                        d_inode(newpath.dentry),
 679                        dentry, NULL);
 680         if (err)
 681                 ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
 682
 683 out3:
 684         done_path_create(&newpath, dentry);
 685 out2:
 686         path_put(&oldpath);
 687 out1:
 688         ksmbd_revert_fsids(work);
 689         return err;
 690 }
 691
 692 static int ksmbd_validate_entry_in_use(struct dentry *src_dent)
 693 {
 694         struct dentry *dst_dent;
 695
 696         spin_lock(&src_dent->d_lock);
 697         list_for_each_entry(dst_dent, &src_dent->d_subdirs, d_child) {
 698                 struct ksmbd_file *child_fp;
 699
 700                 if (d_really_is_negative(dst_dent))
 701                         continue;
 702
 703                 child_fp = ksmbd_lookup_fd_inode(d_inode(dst_dent));
 704                 if (child_fp) {
 705                         spin_unlock(&src_dent->d_lock);
 706                         ksmbd_debug(VFS, "Forbid rename, sub file/dir is in use\n");
 707                         return -EACCES;
 708                 }
 709         }
 710         spin_unlock(&src_dent->d_lock);
 711
 712         return 0;
 713 }
 714
 715 static int __ksmbd_vfs_rename(struct ksmbd_work *work,
 716                               struct user_namespace *src_user_ns,
 717                               struct dentry *src_dent_parent,
 718                               struct dentry *src_dent,
 719                               struct user_namespace *dst_user_ns,
 720                               struct dentry *dst_dent_parent,
 721                               struct dentry *trap_dent,
 722                               char *dst_name)
 723 {
 724         struct dentry *dst_dent;
 725         int err;
 726
 727         if (!work->tcon->posix_extensions) {
 728                 err = ksmbd_validate_entry_in_use(src_dent);
 729                 if (err)
 730                         return err;
 731         }
 732
 733         if (d_really_is_negative(src_dent_parent))
 734                 return -ENOENT;
 735         if (d_really_is_negative(dst_dent_parent))
 736                 return -ENOENT;
 737         if (d_really_is_negative(src_dent))
 738                 return -ENOENT;
 739         if (src_dent == trap_dent)
 740                 return -EINVAL;
 741
 742         if (ksmbd_override_fsids(work))
 743                 return -ENOMEM;
 744
 745         dst_dent = lookup_one(dst_user_ns, dst_name, dst_dent_parent,
 746                               strlen(dst_name));
 747         err = PTR_ERR(dst_dent);
 748         if (IS_ERR(dst_dent)) {
 749                 pr_err("lookup failed %s [%d]\n", dst_name, err);
 750                 goto out;
 751         }
 752
 753         err = -ENOTEMPTY;
 754         if (dst_dent != trap_dent && !d_really_is_positive(dst_dent)) {
 755                 struct renamedata rd = {
 756                         .old_mnt_userns = src_user_ns,
 757                         .old_dir        = d_inode(src_dent_parent),
 758                         .old_dentry     = src_dent,
 759                         .new_mnt_userns = dst_user_ns,
 760                         .new_dir        = d_inode(dst_dent_parent),
 761                         .new_dentry     = dst_dent,
 762                 };
 763                 err = vfs_rename(&rd);
 764         }
 765         if (err)
 766                 pr_err("vfs_rename failed err %d\n", err);
 767         if (dst_dent)
 768                 dput(dst_dent);
 769 out:
 770         ksmbd_revert_fsids(work);
 771         return err;
 772 }
 773
 774 int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file *fp,
 775                         char *newname)
 776 {
 777         struct user_namespace *user_ns;
 778         struct path dst_path;
 779         struct dentry *src_dent_parent, *dst_dent_parent;
 780         struct dentry *src_dent, *trap_dent, *src_child;
 781         char *dst_name;
 782         int err;
 783
 784         dst_name = extract_last_component(newname);
 785         if (!dst_name) {
 786                 dst_name = newname;
 787                 newname = "";
 788         }
 789
 790         src_dent_parent = dget_parent(fp->filp->f_path.dentry);
 791         src_dent = fp->filp->f_path.dentry;
 792
 793         err = ksmbd_vfs_kern_path(work, newname,
 794                                   LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
 795                                   &dst_path, false);
 796         if (err) {
 797                 ksmbd_debug(VFS, "Cannot get path for %s [%d]\n", newname, err);
 798                 goto out;
 799         }
 800         dst_dent_parent = dst_path.dentry;
 801
 802         trap_dent = lock_rename(src_dent_parent, dst_dent_parent);
 803         dget(src_dent);
 804         dget(dst_dent_parent);
 805         user_ns = file_mnt_user_ns(fp->filp);
 806         src_child = lookup_one(user_ns, src_dent->d_name.name, src_dent_parent,
 807                                src_dent->d_name.len);
 808         if (IS_ERR(src_child)) {
 809                 err = PTR_ERR(src_child);
 810                 goto out_lock;
 811         }
 812
 813         if (src_child != src_dent) {
 814                 err = -ESTALE;
 815                 dput(src_child);
 816                 goto out_lock;
 817         }
 818         dput(src_child);
 819
 820         err = __ksmbd_vfs_rename(work,
 821                                  user_ns,
 822                                  src_dent_parent,
 823                                  src_dent,
 824                                  mnt_user_ns(dst_path.mnt),
 825                                  dst_dent_parent,
 826                                  trap_dent,
 827                                  dst_name);
 828 out_lock:
 829         dput(src_dent);
 830         dput(dst_dent_parent);
 831         unlock_rename(src_dent_parent, dst_dent_parent);
 832         path_put(&dst_path);
 833 out:
 834         dput(src_dent_parent);
 835         return err;
 836 }
 837
 838 /**
 839  * ksmbd_vfs_truncate() - vfs helper for smb file truncate
 840  * @work:       work
 841  * @fid:        file id of old file
 842  * @size:       truncate to given size
 843  *
 844  * Return:      0 on success, otherwise error
 845  */
 846 int ksmbd_vfs_truncate(struct ksmbd_work *work,
 847                        struct ksmbd_file *fp, loff_t size)
 848 {
 849         int err = 0;
 850         struct file *filp;
 851
 852         filp = fp->filp;
 853
 854         /* Do we need to break any of a levelII oplock? */
 855         smb_break_all_levII_oplock(work, fp, 1);
 856
 857         if (!work->tcon->posix_extensions) {
 858                 struct inode *inode = file_inode(filp);
 859
 860                 if (size < inode->i_size) {
 861                         err = check_lock_range(filp, size,
 862                                                inode->i_size - 1, WRITE);
 863                 } else {
 864                         err = check_lock_range(filp, inode->i_size,
 865                                                size - 1, WRITE);
 866                 }
 867
 868                 if (err) {
 869                         pr_err("failed due to lock\n");
 870                         return -EAGAIN;
 871                 }
 872         }
 873
 874         err = vfs_truncate(&filp->f_path, size);
 875         if (err)
 876                 pr_err("truncate failed, err %d\n", err);
 877         return err;
 878 }
 879
 880 /**
 881  * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
 882  * @dentry:     dentry of file for listing xattrs
 883  * @list:       destination buffer
 884  * @size:       destination buffer length
 885  *
 886  * Return:      xattr list length on success, otherwise error
 887  */
 888 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
 889 {
 890         ssize_t size;
 891         char *vlist = NULL;
 892
 893         size = vfs_listxattr(dentry, NULL, 0);
 894         if (size <= 0)
 895                 return size;
 896
 897         vlist = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
 898         if (!vlist)
 899                 return -ENOMEM;
 900
 901         *list = vlist;
 902         size = vfs_listxattr(dentry, vlist, size);
 903         if (size < 0) {
 904                 ksmbd_debug(VFS, "listxattr failed\n");
 905                 kvfree(vlist);
 906                 *list = NULL;
 907         }
 908
 909         return size;
 910 }
 911
 912 static ssize_t ksmbd_vfs_xattr_len(struct user_namespace *user_ns,
 913                                    struct dentry *dentry, char *xattr_name)
 914 {
 915         return vfs_getxattr(user_ns, dentry, xattr_name, NULL, 0);
 916 }
 917
 918 /**
 919  * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
 920  * @user_ns:    user namespace
 921  * @dentry:     dentry of file for getting xattrs
 922  * @xattr_name: name of xattr name to query
 923  * @xattr_buf:  destination buffer xattr value
 924  *
 925  * Return:      read xattr value length on success, otherwise error
 926  */
 927 ssize_t ksmbd_vfs_getxattr(struct user_namespace *user_ns,
 928                            struct dentry *dentry,
 929                            char *xattr_name, char **xattr_buf)
 930 {
 931         ssize_t xattr_len;
 932         char *buf;
 933
 934         *xattr_buf = NULL;
 935         xattr_len = ksmbd_vfs_xattr_len(user_ns, dentry, xattr_name);
 936         if (xattr_len < 0)
 937                 return xattr_len;
 938
 939         buf = kmalloc(xattr_len + 1, GFP_KERNEL);
 940         if (!buf)
 941                 return -ENOMEM;
 942
 943         xattr_len = vfs_getxattr(user_ns, dentry, xattr_name,
 944                                  (void *)buf, xattr_len);
 945         if (xattr_len > 0)
 946                 *xattr_buf = buf;
 947         else
 948                 kfree(buf);
 949         return xattr_len;
 950 }
 951
 952 /**
 953  * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
 954  * @user_ns:    user namespace
 955  * @dentry:     dentry to set XATTR at
 956  * @name:       xattr name for setxattr
 957  * @value:      xattr value to set
 958  * @size:       size of xattr value
 959  * @flags:      destination buffer length
 960  *
 961  * Return:      0 on success, otherwise error
 962  */
 963 int ksmbd_vfs_setxattr(struct user_namespace *user_ns,
 964                        struct dentry *dentry, const char *attr_name,
 965                        void *attr_value, size_t attr_size, int flags)
 966 {
 967         int err;
 968
 969         err = vfs_setxattr(user_ns,
 970                            dentry,
 971                            attr_name,
 972                            attr_value,
 973                            attr_size,
 974                            flags);
 975         if (err)
 976                 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
 977         return err;
 978 }
 979
 980 /**
 981  * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
 982  * @filp:       file pointer for IO
 983  * @options:    smb IO options
 984  */
 985 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
 986 {
 987         struct address_space *mapping;
 988
 989         mapping = filp->f_mapping;
 990
 991         if (!option || !mapping)
 992                 return;
 993
 994         if (option & FILE_WRITE_THROUGH_LE) {
 995                 filp->f_flags |= O_SYNC;
 996         } else if (option & FILE_SEQUENTIAL_ONLY_LE) {
 997                 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
 998                 spin_lock(&filp->f_lock);
 999                 filp->f_mode &= ~FMODE_RANDOM;
1000                 spin_unlock(&filp->f_lock);
1001         } else if (option & FILE_RANDOM_ACCESS_LE) {
1002                 spin_lock(&filp->f_lock);
1003                 filp->f_mode |= FMODE_RANDOM;
1004                 spin_unlock(&filp->f_lock);
1005         }
1006 }
1007
1008 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
1009                         loff_t off, loff_t len)
1010 {
1011         smb_break_all_levII_oplock(work, fp, 1);
1012         if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
1013                 return vfs_fallocate(fp->filp,
1014                                      FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
1015                                      off, len);
1016
1017         return vfs_fallocate(fp->filp,
1018                              FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
1019                              off, len);
1020 }
1021
1022 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
1023                          struct file_allocated_range_buffer *ranges,
1024                          unsigned int in_count, unsigned int *out_count)
1025 {
1026         struct file *f = fp->filp;
1027         struct inode *inode = file_inode(fp->filp);
1028         loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
1029         loff_t extent_start, extent_end;
1030         int ret = 0;
1031
1032         if (start > maxbytes)
1033                 return -EFBIG;
1034
1035         if (!in_count)
1036                 return 0;
1037
1038         /*
1039          * Shrink request scope to what the fs can actually handle.
1040          */
1041         if (length > maxbytes || (maxbytes - length) < start)
1042                 length = maxbytes - start;
1043
1044         if (start + length > inode->i_size)
1045                 length = inode->i_size - start;
1046
1047         *out_count = 0;
1048         end = start + length;
1049         while (start < end && *out_count < in_count) {
1050                 extent_start = vfs_llseek(f, start, SEEK_DATA);
1051                 if (extent_start < 0) {
1052                         if (extent_start != -ENXIO)
1053                                 ret = (int)extent_start;
1054                         break;
1055                 }
1056
1057                 if (extent_start >= end)
1058                         break;
1059
1060                 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
1061                 if (extent_end < 0) {
1062                         if (extent_end != -ENXIO)
1063                                 ret = (int)extent_end;
1064                         break;
1065                 } else if (extent_start >= extent_end) {
1066                         break;
1067                 }
1068
1069                 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1070                 ranges[(*out_count)++].length =
1071                         cpu_to_le64(min(extent_end, end) - extent_start);
1072
1073                 start = extent_end;
1074         }
1075
1076         return ret;
1077 }
1078
1079 int ksmbd_vfs_remove_xattr(struct user_namespace *user_ns,
1080                            struct dentry *dentry, char *attr_name)
1081 {
1082         return vfs_removexattr(user_ns, dentry, attr_name);
1083 }
1084
1085 int ksmbd_vfs_unlink(struct user_namespace *user_ns,
1086                      struct dentry *dir, struct dentry *dentry)
1087 {
1088         int err = 0;
1089
1090         err = ksmbd_vfs_lock_parent(user_ns, dir, dentry);
1091         if (err)
1092                 return err;
1093         dget(dentry);
1094
1095         if (S_ISDIR(d_inode(dentry)->i_mode))
1096                 err = vfs_rmdir(user_ns, d_inode(dir), dentry);
1097         else
1098                 err = vfs_unlink(user_ns, d_inode(dir), dentry, NULL);
1099
1100         dput(dentry);
1101         inode_unlock(d_inode(dir));
1102         if (err)
1103                 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1104
1105         return err;
1106 }
1107
1108 static int __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1109                        loff_t offset, u64 ino, unsigned int d_type)
1110 {
1111         struct ksmbd_readdir_data *buf;
1112
1113         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1114         buf->dirent_count++;
1115
1116         if (buf->dirent_count > 2)
1117                 return -ENOTEMPTY;
1118         return 0;
1119 }
1120
1121 /**
1122  * ksmbd_vfs_empty_dir() - check for empty directory
1123  * @fp: ksmbd file pointer
1124  *
1125  * Return:      true if directory empty, otherwise false
1126  */
1127 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1128 {
1129         int err;
1130         struct ksmbd_readdir_data readdir_data;
1131
1132         memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1133
1134         set_ctx_actor(&readdir_data.ctx, __dir_empty);
1135         readdir_data.dirent_count = 0;
1136
1137         err = iterate_dir(fp->filp, &readdir_data.ctx);
1138         if (readdir_data.dirent_count > 2)
1139                 err = -ENOTEMPTY;
1140         else
1141                 err = 0;
1142         return err;
1143 }
1144
1145 static int __caseless_lookup(struct dir_context *ctx, const char *name,
1146                              int namlen, loff_t offset, u64 ino,
1147                              unsigned int d_type)
1148 {
1149         struct ksmbd_readdir_data *buf;
1150
1151         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1152
1153         if (buf->used != namlen)
1154                 return 0;
1155         if (!strncasecmp((char *)buf->private, name, namlen)) {
1156                 memcpy((char *)buf->private, name, namlen);
1157                 buf->dirent_count = 1;
1158                 return -EEXIST;
1159         }
1160         return 0;
1161 }
1162
1163 /**
1164  * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1165  * @dir:        path info
1166  * @name:       filename to lookup
1167  * @namelen:    filename length
1168  *
1169  * Return:      0 on success, otherwise error
1170  */
1171 static int ksmbd_vfs_lookup_in_dir(struct path *dir, char *name, size_t namelen)
1172 {
1173         int ret;
1174         struct file *dfilp;
1175         int flags = O_RDONLY | O_LARGEFILE;
1176         struct ksmbd_readdir_data readdir_data = {
1177                 .ctx.actor      = __caseless_lookup,
1178                 .private        = name,
1179                 .used           = namelen,
1180                 .dirent_count   = 0,
1181         };
1182
1183         dfilp = dentry_open(dir, flags, current_cred());
1184         if (IS_ERR(dfilp))
1185                 return PTR_ERR(dfilp);
1186
1187         ret = iterate_dir(dfilp, &readdir_data.ctx);
1188         if (readdir_data.dirent_count > 0)
1189                 ret = 0;
1190         fput(dfilp);
1191         return ret;
1192 }
1193
1194 /**
1195  * ksmbd_vfs_kern_path() - lookup a file and get path info
1196  * @name:       file path that is relative to share
1197  * @flags:      lookup flags
1198  * @path:       if lookup succeed, return path info
1199  * @caseless:   caseless filename lookup
1200  *
1201  * Return:      0 on success, otherwise error
1202  */
1203 int ksmbd_vfs_kern_path(struct ksmbd_work *work, char *name,
1204                         unsigned int flags, struct path *path, bool caseless)
1205 {
1206         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1207         int err;
1208
1209         flags |= LOOKUP_BENEATH;
1210         err = vfs_path_lookup(share_conf->vfs_path.dentry,
1211                               share_conf->vfs_path.mnt,
1212                               name,
1213                               flags,
1214                               path);
1215         if (!err)
1216                 return 0;
1217
1218         if (caseless) {
1219                 char *filepath;
1220                 struct path parent;
1221                 size_t path_len, remain_len;
1222
1223                 filepath = kstrdup(name, GFP_KERNEL);
1224                 if (!filepath)
1225                         return -ENOMEM;
1226
1227                 path_len = strlen(filepath);
1228                 remain_len = path_len;
1229
1230                 parent = share_conf->vfs_path;
1231                 path_get(&parent);
1232
1233                 while (d_can_lookup(parent.dentry)) {
1234                         char *filename = filepath + path_len - remain_len;
1235                         char *next = strchrnul(filename, '/');
1236                         size_t filename_len = next - filename;
1237                         bool is_last = !next[0];
1238
1239                         if (filename_len == 0)
1240                                 break;
1241
1242                         err = ksmbd_vfs_lookup_in_dir(&parent, filename,
1243                                                       filename_len);
1244                         path_put(&parent);
1245                         if (err)
1246                                 goto out;
1247
1248                         next[0] = '\0';
1249
1250                         err = vfs_path_lookup(share_conf->vfs_path.dentry,
1251                                               share_conf->vfs_path.mnt,
1252                                               filepath,
1253                                               flags,
1254                                               &parent);
1255                         if (err)
1256                                 goto out;
1257                         else if (is_last) {
1258                                 *path = parent;
1259                                 goto out;
1260                         }
1261
1262                         next[0] = '/';
1263                         remain_len -= filename_len + 1;
1264                 }
1265
1266                 path_put(&parent);
1267                 err = -EINVAL;
1268 out:
1269                 kfree(filepath);
1270         }
1271         return err;
1272 }
1273
1274 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1275                                           const char *name,
1276                                           unsigned int flags,
1277                                           struct path *path)
1278 {
1279         char *abs_name;
1280         struct dentry *dent;
1281
1282         abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1283         if (!abs_name)
1284                 return ERR_PTR(-ENOMEM);
1285
1286         dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1287         kfree(abs_name);
1288         return dent;
1289 }
1290
1291 int ksmbd_vfs_remove_acl_xattrs(struct user_namespace *user_ns,
1292                                 struct dentry *dentry)
1293 {
1294         char *name, *xattr_list = NULL;
1295         ssize_t xattr_list_len;
1296         int err = 0;
1297
1298         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1299         if (xattr_list_len < 0) {
1300                 goto out;
1301         } else if (!xattr_list_len) {
1302                 ksmbd_debug(SMB, "empty xattr in the file\n");
1303                 goto out;
1304         }
1305
1306         for (name = xattr_list; name - xattr_list < xattr_list_len;
1307              name += strlen(name) + 1) {
1308                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1309
1310                 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1311                              sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1312                     !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1313                              sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1314                         err = ksmbd_vfs_remove_xattr(user_ns, dentry, name);
1315                         if (err)
1316                                 ksmbd_debug(SMB,
1317                                             "remove acl xattr failed : %s\n", name);
1318                 }
1319         }
1320 out:
1321         kvfree(xattr_list);
1322         return err;
1323 }
1324
1325 int ksmbd_vfs_remove_sd_xattrs(struct user_namespace *user_ns,
1326                                struct dentry *dentry)
1327 {
1328         char *name, *xattr_list = NULL;
1329         ssize_t xattr_list_len;
1330         int err = 0;
1331
1332         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1333         if (xattr_list_len < 0) {
1334                 goto out;
1335         } else if (!xattr_list_len) {
1336                 ksmbd_debug(SMB, "empty xattr in the file\n");
1337                 goto out;
1338         }
1339
1340         for (name = xattr_list; name - xattr_list < xattr_list_len;
1341                         name += strlen(name) + 1) {
1342                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1343
1344                 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1345                         err = ksmbd_vfs_remove_xattr(user_ns, dentry, name);
1346                         if (err)
1347                                 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1348                 }
1349         }
1350 out:
1351         kvfree(xattr_list);
1352         return err;
1353 }
1354
1355 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct user_namespace *user_ns,
1356                                                             struct inode *inode,
1357                                                             int acl_type)
1358 {
1359         struct xattr_smb_acl *smb_acl = NULL;
1360         struct posix_acl *posix_acls;
1361         struct posix_acl_entry *pa_entry;
1362         struct xattr_acl_entry *xa_entry;
1363         int i;
1364
1365         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1366                 return NULL;
1367
1368         posix_acls = get_acl(inode, acl_type);
1369         if (!posix_acls)
1370                 return NULL;
1371
1372         smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1373                           sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1374                           GFP_KERNEL);
1375         if (!smb_acl)
1376                 goto out;
1377
1378         smb_acl->count = posix_acls->a_count;
1379         pa_entry = posix_acls->a_entries;
1380         xa_entry = smb_acl->entries;
1381         for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1382                 switch (pa_entry->e_tag) {
1383                 case ACL_USER:
1384                         xa_entry->type = SMB_ACL_USER;
1385                         xa_entry->uid = posix_acl_uid_translate(user_ns, pa_entry);
1386                         break;
1387                 case ACL_USER_OBJ:
1388                         xa_entry->type = SMB_ACL_USER_OBJ;
1389                         break;
1390                 case ACL_GROUP:
1391                         xa_entry->type = SMB_ACL_GROUP;
1392                         xa_entry->gid = posix_acl_gid_translate(user_ns, pa_entry);
1393                         break;
1394                 case ACL_GROUP_OBJ:
1395                         xa_entry->type = SMB_ACL_GROUP_OBJ;
1396                         break;
1397                 case ACL_OTHER:
1398                         xa_entry->type = SMB_ACL_OTHER;
1399                         break;
1400                 case ACL_MASK:
1401                         xa_entry->type = SMB_ACL_MASK;
1402                         break;
1403                 default:
1404                         pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1405                         goto out;
1406                 }
1407
1408                 if (pa_entry->e_perm & ACL_READ)
1409                         xa_entry->perm |= SMB_ACL_READ;
1410                 if (pa_entry->e_perm & ACL_WRITE)
1411                         xa_entry->perm |= SMB_ACL_WRITE;
1412                 if (pa_entry->e_perm & ACL_EXECUTE)
1413                         xa_entry->perm |= SMB_ACL_EXECUTE;
1414         }
1415 out:
1416         posix_acl_release(posix_acls);
1417         return smb_acl;
1418 }
1419
1420 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1421                            struct user_namespace *user_ns,
1422                            struct dentry *dentry,
1423                            struct smb_ntsd *pntsd, int len)
1424 {
1425         int rc;
1426         struct ndr sd_ndr = {0}, acl_ndr = {0};
1427         struct xattr_ntacl acl = {0};
1428         struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1429         struct inode *inode = d_inode(dentry);
1430
1431         acl.version = 4;
1432         acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1433         acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1434
1435         memcpy(acl.desc, "posix_acl", 9);
1436         acl.desc_len = 10;
1437
1438         pntsd->osidoffset =
1439                 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1440         pntsd->gsidoffset =
1441                 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1442         pntsd->dacloffset =
1443                 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1444
1445         acl.sd_buf = (char *)pntsd;
1446         acl.sd_size = len;
1447
1448         rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1449         if (rc) {
1450                 pr_err("failed to generate hash for ndr acl\n");
1451                 return rc;
1452         }
1453
1454         smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1455                                                  ACL_TYPE_ACCESS);
1456         if (S_ISDIR(inode->i_mode))
1457                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1458                                                              ACL_TYPE_DEFAULT);
1459
1460         rc = ndr_encode_posix_acl(&acl_ndr, user_ns, inode,
1461                                   smb_acl, def_smb_acl);
1462         if (rc) {
1463                 pr_err("failed to encode ndr to posix acl\n");
1464                 goto out;
1465         }
1466
1467         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1468                                acl.posix_acl_hash);
1469         if (rc) {
1470                 pr_err("failed to generate hash for ndr acl\n");
1471                 goto out;
1472         }
1473
1474         rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1475         if (rc) {
1476                 pr_err("failed to encode ndr to posix acl\n");
1477                 goto out;
1478         }
1479
1480         rc = ksmbd_vfs_setxattr(user_ns, dentry,
1481                                 XATTR_NAME_SD, sd_ndr.data,
1482                                 sd_ndr.offset, 0);
1483         if (rc < 0)
1484                 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1485
1486         kfree(sd_ndr.data);
1487 out:
1488         kfree(acl_ndr.data);
1489         kfree(smb_acl);
1490         kfree(def_smb_acl);
1491         return rc;
1492 }
1493
1494 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1495                            struct user_namespace *user_ns,
1496                            struct dentry *dentry,
1497                            struct smb_ntsd **pntsd)
1498 {
1499         int rc;
1500         struct ndr n;
1501         struct inode *inode = d_inode(dentry);
1502         struct ndr acl_ndr = {0};
1503         struct xattr_ntacl acl;
1504         struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1505         __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1506
1507         rc = ksmbd_vfs_getxattr(user_ns, dentry, XATTR_NAME_SD, &n.data);
1508         if (rc <= 0)
1509                 return rc;
1510
1511         n.length = rc;
1512         rc = ndr_decode_v4_ntacl(&n, &acl);
1513         if (rc)
1514                 goto free_n_data;
1515
1516         smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1517                                                  ACL_TYPE_ACCESS);
1518         if (S_ISDIR(inode->i_mode))
1519                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1520                                                              ACL_TYPE_DEFAULT);
1521
1522         rc = ndr_encode_posix_acl(&acl_ndr, user_ns, inode, smb_acl,
1523                                   def_smb_acl);
1524         if (rc) {
1525                 pr_err("failed to encode ndr to posix acl\n");
1526                 goto out_free;
1527         }
1528
1529         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1530         if (rc) {
1531                 pr_err("failed to generate hash for ndr acl\n");
1532                 goto out_free;
1533         }
1534
1535         if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1536                 pr_err("hash value diff\n");
1537                 rc = -EINVAL;
1538                 goto out_free;
1539         }
1540
1541         *pntsd = acl.sd_buf;
1542         if (acl.sd_size < sizeof(struct smb_ntsd)) {
1543                 pr_err("sd size is invalid\n");
1544                 goto out_free;
1545         }
1546
1547         (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1548                                            NDR_NTSD_OFFSETOF);
1549         (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1550                                            NDR_NTSD_OFFSETOF);
1551         (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1552                                            NDR_NTSD_OFFSETOF);
1553
1554         rc = acl.sd_size;
1555 out_free:
1556         kfree(acl_ndr.data);
1557         kfree(smb_acl);
1558         kfree(def_smb_acl);
1559         if (rc < 0) {
1560                 kfree(acl.sd_buf);
1561                 *pntsd = NULL;
1562         }
1563
1564 free_n_data:
1565         kfree(n.data);
1566         return rc;
1567 }
1568
1569 int ksmbd_vfs_set_dos_attrib_xattr(struct user_namespace *user_ns,
1570                                    struct dentry *dentry,
1571                                    struct xattr_dos_attrib *da)
1572 {
1573         struct ndr n;
1574         int err;
1575
1576         err = ndr_encode_dos_attr(&n, da);
1577         if (err)
1578                 return err;
1579
1580         err = ksmbd_vfs_setxattr(user_ns, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1581                                  (void *)n.data, n.offset, 0);
1582         if (err)
1583                 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1584         kfree(n.data);
1585
1586         return err;
1587 }
1588
1589 int ksmbd_vfs_get_dos_attrib_xattr(struct user_namespace *user_ns,
1590                                    struct dentry *dentry,
1591                                    struct xattr_dos_attrib *da)
1592 {
1593         struct ndr n;
1594         int err;
1595
1596         err = ksmbd_vfs_getxattr(user_ns, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1597                                  (char **)&n.data);
1598         if (err > 0) {
1599                 n.length = err;
1600                 if (ndr_decode_dos_attr(&n, da))
1601                         err = -EINVAL;
1602                 kfree(n.data);
1603         } else {
1604                 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1605         }
1606
1607         return err;
1608 }
1609
1610 /**
1611  * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1612  * @p:          destination buffer
1613  * @ksmbd_kstat:      ksmbd kstat wrapper
1614  */
1615 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1616 {
1617         struct file_directory_info *info = (struct file_directory_info *)(*p);
1618         struct kstat *kstat = ksmbd_kstat->kstat;
1619         u64 time;
1620
1621         info->FileIndex = 0;
1622         info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1623         time = ksmbd_UnixTimeToNT(kstat->atime);
1624         info->LastAccessTime = cpu_to_le64(time);
1625         time = ksmbd_UnixTimeToNT(kstat->mtime);
1626         info->LastWriteTime = cpu_to_le64(time);
1627         time = ksmbd_UnixTimeToNT(kstat->ctime);
1628         info->ChangeTime = cpu_to_le64(time);
1629
1630         if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1631                 info->EndOfFile = 0;
1632                 info->AllocationSize = 0;
1633         } else {
1634                 info->EndOfFile = cpu_to_le64(kstat->size);
1635                 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1636         }
1637         info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1638
1639         return info;
1640 }
1641
1642 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1643                                 struct user_namespace *user_ns,
1644                                 struct dentry *dentry,
1645                                 struct ksmbd_kstat *ksmbd_kstat)
1646 {
1647         u64 time;
1648         int rc;
1649
1650         generic_fillattr(user_ns, d_inode(dentry), ksmbd_kstat->kstat);
1651
1652         time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1653         ksmbd_kstat->create_time = time;
1654
1655         /*
1656          * set default value for the case that store dos attributes is not yes
1657          * or that acl is disable in server's filesystem and the config is yes.
1658          */
1659         if (S_ISDIR(ksmbd_kstat->kstat->mode))
1660                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1661         else
1662                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1663
1664         if (test_share_config_flag(work->tcon->share_conf,
1665                                    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1666                 struct xattr_dos_attrib da;
1667
1668                 rc = ksmbd_vfs_get_dos_attrib_xattr(user_ns, dentry, &da);
1669                 if (rc > 0) {
1670                         ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1671                         ksmbd_kstat->create_time = da.create_time;
1672                 } else {
1673                         ksmbd_debug(VFS, "fail to load dos attribute.\n");
1674                 }
1675         }
1676
1677         return 0;
1678 }
1679
1680 ssize_t ksmbd_vfs_casexattr_len(struct user_namespace *user_ns,
1681                                 struct dentry *dentry, char *attr_name,
1682                                 int attr_name_len)
1683 {
1684         char *name, *xattr_list = NULL;
1685         ssize_t value_len = -ENOENT, xattr_list_len;
1686
1687         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1688         if (xattr_list_len <= 0)
1689                 goto out;
1690
1691         for (name = xattr_list; name - xattr_list < xattr_list_len;
1692                         name += strlen(name) + 1) {
1693                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1694                 if (strncasecmp(attr_name, name, attr_name_len))
1695                         continue;
1696
1697                 value_len = ksmbd_vfs_xattr_len(user_ns, dentry, name);
1698                 break;
1699         }
1700
1701 out:
1702         kvfree(xattr_list);
1703         return value_len;
1704 }
1705
1706 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1707                                 size_t *xattr_stream_name_size, int s_type)
1708 {
1709         char *type, *buf;
1710
1711         if (s_type == DIR_STREAM)
1712                 type = ":$INDEX_ALLOCATION";
1713         else
1714                 type = ":$DATA";
1715
1716         buf = kasprintf(GFP_KERNEL, "%s%s%s",
1717                         XATTR_NAME_STREAM, stream_name, type);
1718         if (!buf)
1719                 return -ENOMEM;
1720
1721         *xattr_stream_name = buf;
1722         *xattr_stream_name_size = strlen(buf) + 1;
1723
1724         return 0;
1725 }
1726
1727 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1728                                struct ksmbd_file *src_fp,
1729                                struct ksmbd_file *dst_fp,
1730                                struct srv_copychunk *chunks,
1731                                unsigned int chunk_count,
1732                                unsigned int *chunk_count_written,
1733                                unsigned int *chunk_size_written,
1734                                loff_t *total_size_written)
1735 {
1736         unsigned int i;
1737         loff_t src_off, dst_off, src_file_size;
1738         size_t len;
1739         int ret;
1740
1741         *chunk_count_written = 0;
1742         *chunk_size_written = 0;
1743         *total_size_written = 0;
1744
1745         if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1746                 pr_err("no right to read(%pd)\n", src_fp->filp->f_path.dentry);
1747                 return -EACCES;
1748         }
1749         if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1750                 pr_err("no right to write(%pd)\n", dst_fp->filp->f_path.dentry);
1751                 return -EACCES;
1752         }
1753
1754         if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1755                 return -EBADF;
1756
1757         smb_break_all_levII_oplock(work, dst_fp, 1);
1758
1759         if (!work->tcon->posix_extensions) {
1760                 for (i = 0; i < chunk_count; i++) {
1761                         src_off = le64_to_cpu(chunks[i].SourceOffset);
1762                         dst_off = le64_to_cpu(chunks[i].TargetOffset);
1763                         len = le32_to_cpu(chunks[i].Length);
1764
1765                         if (check_lock_range(src_fp->filp, src_off,
1766                                              src_off + len - 1, READ))
1767                                 return -EAGAIN;
1768                         if (check_lock_range(dst_fp->filp, dst_off,
1769                                              dst_off + len - 1, WRITE))
1770                                 return -EAGAIN;
1771                 }
1772         }
1773
1774         src_file_size = i_size_read(file_inode(src_fp->filp));
1775
1776         for (i = 0; i < chunk_count; i++) {
1777                 src_off = le64_to_cpu(chunks[i].SourceOffset);
1778                 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1779                 len = le32_to_cpu(chunks[i].Length);
1780
1781                 if (src_off + len > src_file_size)
1782                         return -E2BIG;
1783
1784                 ret = vfs_copy_file_range(src_fp->filp, src_off,
1785                                           dst_fp->filp, dst_off, len, 0);
1786                 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1787                         ret = generic_copy_file_range(src_fp->filp, src_off,
1788                                                       dst_fp->filp, dst_off,
1789                                                       len, 0);
1790                 if (ret < 0)
1791                         return ret;
1792
1793                 *chunk_count_written += 1;
1794                 *total_size_written += ret;
1795         }
1796         return 0;
1797 }
1798
1799 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1800 {
1801         wait_event(flock->fl_wait, !flock->fl_blocker);
1802 }
1803
1804 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1805 {
1806         return wait_event_interruptible_timeout(flock->fl_wait,
1807                                                 !flock->fl_blocker,
1808                                                 timeout);
1809 }
1810
1811 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1812 {
1813         locks_delete_block(flock);
1814 }
1815
1816 int ksmbd_vfs_set_init_posix_acl(struct user_namespace *user_ns,
1817                                  struct inode *inode)
1818 {
1819         struct posix_acl_state acl_state;
1820         struct posix_acl *acls;
1821         int rc;
1822
1823         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1824                 return -EOPNOTSUPP;
1825
1826         ksmbd_debug(SMB, "Set posix acls\n");
1827         rc = init_acl_state(&acl_state, 1);
1828         if (rc)
1829                 return rc;
1830
1831         /* Set default owner group */
1832         acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1833         acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1834         acl_state.other.allow = inode->i_mode & 0007;
1835         acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1836         acl_state.users->aces[acl_state.users->n++].perms.allow =
1837                 acl_state.owner.allow;
1838         acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1839         acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1840                 acl_state.group.allow;
1841         acl_state.mask.allow = 0x07;
1842
1843         acls = posix_acl_alloc(6, GFP_KERNEL);
1844         if (!acls) {
1845                 free_acl_state(&acl_state);
1846                 return -ENOMEM;
1847         }
1848         posix_state_to_acl(&acl_state, acls->a_entries);
1849         rc = set_posix_acl(user_ns, inode, ACL_TYPE_ACCESS, acls);
1850         if (rc < 0)
1851                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1852                             rc);
1853         else if (S_ISDIR(inode->i_mode)) {
1854                 posix_state_to_acl(&acl_state, acls->a_entries);
1855                 rc = set_posix_acl(user_ns, inode, ACL_TYPE_DEFAULT,
1856                                    acls);
1857                 if (rc < 0)
1858                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1859                                     rc);
1860         }
1861         free_acl_state(&acl_state);
1862         posix_acl_release(acls);
1863         return rc;
1864 }
1865
1866 int ksmbd_vfs_inherit_posix_acl(struct user_namespace *user_ns,
1867                                 struct inode *inode, struct inode *parent_inode)
1868 {
1869         struct posix_acl *acls;
1870         struct posix_acl_entry *pace;
1871         int rc, i;
1872
1873         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1874                 return -EOPNOTSUPP;
1875
1876         acls = get_acl(parent_inode, ACL_TYPE_DEFAULT);
1877         if (!acls)
1878                 return -ENOENT;
1879         pace = acls->a_entries;
1880
1881         for (i = 0; i < acls->a_count; i++, pace++) {
1882                 if (pace->e_tag == ACL_MASK) {
1883                         pace->e_perm = 0x07;
1884                         break;
1885                 }
1886         }
1887
1888         rc = set_posix_acl(user_ns, inode, ACL_TYPE_ACCESS, acls);
1889         if (rc < 0)
1890                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1891                             rc);
1892         if (S_ISDIR(inode->i_mode)) {
1893                 rc = set_posix_acl(user_ns, inode, ACL_TYPE_DEFAULT,
1894                                    acls);
1895                 if (rc < 0)
1896                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1897                                     rc);
1898         }
1899         posix_acl_release(acls);
1900         return rc;
1901 }