fs/ksmbd/vfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
   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 ksmbd_session *sess = work->sess;
 485         struct file *filp;
 486         loff_t  offset = *pos;
 487         int err = 0;
 488
 489         if (sess->conn->connection_type) {
 490                 if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
 491                         pr_err("no right to write(%pd)\n",
 492                                fp->filp->f_path.dentry);
 493                         err = -EACCES;
 494                         goto out;
 495                 }
 496         }
 497
 498         filp = fp->filp;
 499
 500         if (ksmbd_stream_fd(fp)) {
 501                 err = ksmbd_vfs_stream_write(fp, buf, pos, count);
 502                 if (!err)
 503                         *written = count;
 504                 goto out;
 505         }
 506
 507         if (!work->tcon->posix_extensions) {
 508                 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
 509                 if (err) {
 510                         pr_err("unable to write due to lock\n");
 511                         err = -EAGAIN;
 512                         goto out;
 513                 }
 514         }
 515
 516         /* Do we need to break any of a levelII oplock? */
 517         smb_break_all_levII_oplock(work, fp, 1);
 518
 519         err = kernel_write(filp, buf, count, pos);
 520         if (err < 0) {
 521                 ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
 522                 goto out;
 523         }
 524
 525         filp->f_pos = *pos;
 526         *written = err;
 527         err = 0;
 528         if (sync) {
 529                 err = vfs_fsync_range(filp, offset, offset + *written, 0);
 530                 if (err < 0)
 531                         pr_err("fsync failed for filename = %pd, err = %d\n",
 532                                fp->filp->f_path.dentry, err);
 533         }
 534
 535 out:
 536         return err;
 537 }
 538
 539 /**
 540  * ksmbd_vfs_getattr() - vfs helper for smb getattr
 541  * @work:       work
 542  * @fid:        file id of open file
 543  * @attrs:      inode attributes
 544  *
 545  * Return:      0 on success, otherwise error
 546  */
 547 int ksmbd_vfs_getattr(struct path *path, struct kstat *stat)
 548 {
 549         int err;
 550
 551         err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
 552         if (err)
 553                 pr_err("getattr failed, err %d\n", err);
 554         return err;
 555 }
 556
 557 /**
 558  * ksmbd_vfs_fsync() - vfs helper for smb fsync
 559  * @work:       work
 560  * @fid:        file id of open file
 561  *
 562  * Return:      0 on success, otherwise error
 563  */
 564 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
 565 {
 566         struct ksmbd_file *fp;
 567         int err;
 568
 569         fp = ksmbd_lookup_fd_slow(work, fid, p_id);
 570         if (!fp) {
 571                 pr_err("failed to get filp for fid %llu\n", fid);
 572                 return -ENOENT;
 573         }
 574         err = vfs_fsync(fp->filp, 0);
 575         if (err < 0)
 576                 pr_err("smb fsync failed, err = %d\n", err);
 577         ksmbd_fd_put(work, fp);
 578         return err;
 579 }
 580
 581 /**
 582  * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
 583  * @name:       directory or file name that is relative to share
 584  *
 585  * Return:      0 on success, otherwise error
 586  */
 587 int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name)
 588 {
 589         struct user_namespace *user_ns;
 590         struct path path;
 591         struct dentry *parent;
 592         int err;
 593
 594         if (ksmbd_override_fsids(work))
 595                 return -ENOMEM;
 596
 597         err = ksmbd_vfs_kern_path(work, name, LOOKUP_NO_SYMLINKS, &path, false);
 598         if (err) {
 599                 ksmbd_debug(VFS, "can't get %s, err %d\n", name, err);
 600                 ksmbd_revert_fsids(work);
 601                 return err;
 602         }
 603
 604         user_ns = mnt_user_ns(path.mnt);
 605         parent = dget_parent(path.dentry);
 606         err = ksmbd_vfs_lock_parent(user_ns, parent, path.dentry);
 607         if (err) {
 608                 dput(parent);
 609                 path_put(&path);
 610                 ksmbd_revert_fsids(work);
 611                 return err;
 612         }
 613
 614         if (!d_inode(path.dentry)->i_nlink) {
 615                 err = -ENOENT;
 616                 goto out_err;
 617         }
 618
 619         if (S_ISDIR(d_inode(path.dentry)->i_mode)) {
 620                 err = vfs_rmdir(user_ns, d_inode(parent), path.dentry);
 621                 if (err && err != -ENOTEMPTY)
 622                         ksmbd_debug(VFS, "%s: rmdir failed, err %d\n", name,
 623                                     err);
 624         } else {
 625                 err = vfs_unlink(user_ns, d_inode(parent), path.dentry, NULL);
 626                 if (err)
 627                         ksmbd_debug(VFS, "%s: unlink failed, err %d\n", name,
 628                                     err);
 629         }
 630
 631 out_err:
 632         inode_unlock(d_inode(parent));
 633         dput(parent);
 634         path_put(&path);
 635         ksmbd_revert_fsids(work);
 636         return err;
 637 }
 638
 639 /**
 640  * ksmbd_vfs_link() - vfs helper for creating smb hardlink
 641  * @oldname:    source file name
 642  * @newname:    hardlink name that is relative to share
 643  *
 644  * Return:      0 on success, otherwise error
 645  */
 646 int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
 647                    const char *newname)
 648 {
 649         struct path oldpath, newpath;
 650         struct dentry *dentry;
 651         int err;
 652
 653         if (ksmbd_override_fsids(work))
 654                 return -ENOMEM;
 655
 656         err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
 657         if (err) {
 658                 pr_err("cannot get linux path for %s, err = %d\n",
 659                        oldname, err);
 660                 goto out1;
 661         }
 662
 663         dentry = ksmbd_vfs_kern_path_create(work, newname,
 664                                             LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
 665                                             &newpath);
 666         if (IS_ERR(dentry)) {
 667                 err = PTR_ERR(dentry);
 668                 pr_err("path create err for %s, err %d\n", newname, err);
 669                 goto out2;
 670         }
 671
 672         err = -EXDEV;
 673         if (oldpath.mnt != newpath.mnt) {
 674                 pr_err("vfs_link failed err %d\n", err);
 675                 goto out3;
 676         }
 677
 678         err = vfs_link(oldpath.dentry, mnt_user_ns(newpath.mnt),
 679                        d_inode(newpath.dentry),
 680                        dentry, NULL);
 681         if (err)
 682                 ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
 683
 684 out3:
 685         done_path_create(&newpath, dentry);
 686 out2:
 687         path_put(&oldpath);
 688 out1:
 689         ksmbd_revert_fsids(work);
 690         return err;
 691 }
 692
 693 static int ksmbd_validate_entry_in_use(struct dentry *src_dent)
 694 {
 695         struct dentry *dst_dent;
 696
 697         spin_lock(&src_dent->d_lock);
 698         list_for_each_entry(dst_dent, &src_dent->d_subdirs, d_child) {
 699                 struct ksmbd_file *child_fp;
 700
 701                 if (d_really_is_negative(dst_dent))
 702                         continue;
 703
 704                 child_fp = ksmbd_lookup_fd_inode(d_inode(dst_dent));
 705                 if (child_fp) {
 706                         spin_unlock(&src_dent->d_lock);
 707                         ksmbd_debug(VFS, "Forbid rename, sub file/dir is in use\n");
 708                         return -EACCES;
 709                 }
 710         }
 711         spin_unlock(&src_dent->d_lock);
 712
 713         return 0;
 714 }
 715
 716 static int __ksmbd_vfs_rename(struct ksmbd_work *work,
 717                               struct user_namespace *src_user_ns,
 718                               struct dentry *src_dent_parent,
 719                               struct dentry *src_dent,
 720                               struct user_namespace *dst_user_ns,
 721                               struct dentry *dst_dent_parent,
 722                               struct dentry *trap_dent,
 723                               char *dst_name)
 724 {
 725         struct dentry *dst_dent;
 726         int err;
 727
 728         if (!work->tcon->posix_extensions) {
 729                 err = ksmbd_validate_entry_in_use(src_dent);
 730                 if (err)
 731                         return err;
 732         }
 733
 734         if (d_really_is_negative(src_dent_parent))
 735                 return -ENOENT;
 736         if (d_really_is_negative(dst_dent_parent))
 737                 return -ENOENT;
 738         if (d_really_is_negative(src_dent))
 739                 return -ENOENT;
 740         if (src_dent == trap_dent)
 741                 return -EINVAL;
 742
 743         if (ksmbd_override_fsids(work))
 744                 return -ENOMEM;
 745
 746         dst_dent = lookup_one(dst_user_ns, dst_name, dst_dent_parent,
 747                               strlen(dst_name));
 748         err = PTR_ERR(dst_dent);
 749         if (IS_ERR(dst_dent)) {
 750                 pr_err("lookup failed %s [%d]\n", dst_name, err);
 751                 goto out;
 752         }
 753
 754         err = -ENOTEMPTY;
 755         if (dst_dent != trap_dent && !d_really_is_positive(dst_dent)) {
 756                 struct renamedata rd = {
 757                         .old_mnt_userns = src_user_ns,
 758                         .old_dir        = d_inode(src_dent_parent),
 759                         .old_dentry     = src_dent,
 760                         .new_mnt_userns = dst_user_ns,
 761                         .new_dir        = d_inode(dst_dent_parent),
 762                         .new_dentry     = dst_dent,
 763                 };
 764                 err = vfs_rename(&rd);
 765         }
 766         if (err)
 767                 pr_err("vfs_rename failed err %d\n", err);
 768         if (dst_dent)
 769                 dput(dst_dent);
 770 out:
 771         ksmbd_revert_fsids(work);
 772         return err;
 773 }
 774
 775 int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file *fp,
 776                         char *newname)
 777 {
 778         struct user_namespace *user_ns;
 779         struct path dst_path;
 780         struct dentry *src_dent_parent, *dst_dent_parent;
 781         struct dentry *src_dent, *trap_dent, *src_child;
 782         char *dst_name;
 783         int err;
 784
 785         dst_name = extract_last_component(newname);
 786         if (!dst_name) {
 787                 dst_name = newname;
 788                 newname = "";
 789         }
 790
 791         src_dent_parent = dget_parent(fp->filp->f_path.dentry);
 792         src_dent = fp->filp->f_path.dentry;
 793
 794         err = ksmbd_vfs_kern_path(work, newname,
 795                                   LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
 796                                   &dst_path, false);
 797         if (err) {
 798                 ksmbd_debug(VFS, "Cannot get path for %s [%d]\n", newname, err);
 799                 goto out;
 800         }
 801         dst_dent_parent = dst_path.dentry;
 802
 803         trap_dent = lock_rename(src_dent_parent, dst_dent_parent);
 804         dget(src_dent);
 805         dget(dst_dent_parent);
 806         user_ns = file_mnt_user_ns(fp->filp);
 807         src_child = lookup_one(user_ns, src_dent->d_name.name, src_dent_parent,
 808                                src_dent->d_name.len);
 809         if (IS_ERR(src_child)) {
 810                 err = PTR_ERR(src_child);
 811                 goto out_lock;
 812         }
 813
 814         if (src_child != src_dent) {
 815                 err = -ESTALE;
 816                 dput(src_child);
 817                 goto out_lock;
 818         }
 819         dput(src_child);
 820
 821         err = __ksmbd_vfs_rename(work,
 822                                  user_ns,
 823                                  src_dent_parent,
 824                                  src_dent,
 825                                  mnt_user_ns(dst_path.mnt),
 826                                  dst_dent_parent,
 827                                  trap_dent,
 828                                  dst_name);
 829 out_lock:
 830         dput(src_dent);
 831         dput(dst_dent_parent);
 832         unlock_rename(src_dent_parent, dst_dent_parent);
 833         path_put(&dst_path);
 834 out:
 835         dput(src_dent_parent);
 836         return err;
 837 }
 838
 839 /**
 840  * ksmbd_vfs_truncate() - vfs helper for smb file truncate
 841  * @work:       work
 842  * @fid:        file id of old file
 843  * @size:       truncate to given size
 844  *
 845  * Return:      0 on success, otherwise error
 846  */
 847 int ksmbd_vfs_truncate(struct ksmbd_work *work,
 848                        struct ksmbd_file *fp, loff_t size)
 849 {
 850         int err = 0;
 851         struct file *filp;
 852
 853         filp = fp->filp;
 854
 855         /* Do we need to break any of a levelII oplock? */
 856         smb_break_all_levII_oplock(work, fp, 1);
 857
 858         if (!work->tcon->posix_extensions) {
 859                 struct inode *inode = file_inode(filp);
 860
 861                 if (size < inode->i_size) {
 862                         err = check_lock_range(filp, size,
 863                                                inode->i_size - 1, WRITE);
 864                 } else {
 865                         err = check_lock_range(filp, inode->i_size,
 866                                                size - 1, WRITE);
 867                 }
 868
 869                 if (err) {
 870                         pr_err("failed due to lock\n");
 871                         return -EAGAIN;
 872                 }
 873         }
 874
 875         err = vfs_truncate(&filp->f_path, size);
 876         if (err)
 877                 pr_err("truncate failed, err %d\n", err);
 878         return err;
 879 }
 880
 881 /**
 882  * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
 883  * @dentry:     dentry of file for listing xattrs
 884  * @list:       destination buffer
 885  * @size:       destination buffer length
 886  *
 887  * Return:      xattr list length on success, otherwise error
 888  */
 889 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
 890 {
 891         ssize_t size;
 892         char *vlist = NULL;
 893
 894         size = vfs_listxattr(dentry, NULL, 0);
 895         if (size <= 0)
 896                 return size;
 897
 898         vlist = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
 899         if (!vlist)
 900                 return -ENOMEM;
 901
 902         *list = vlist;
 903         size = vfs_listxattr(dentry, vlist, size);
 904         if (size < 0) {
 905                 ksmbd_debug(VFS, "listxattr failed\n");
 906                 kvfree(vlist);
 907                 *list = NULL;
 908         }
 909
 910         return size;
 911 }
 912
 913 static ssize_t ksmbd_vfs_xattr_len(struct user_namespace *user_ns,
 914                                    struct dentry *dentry, char *xattr_name)
 915 {
 916         return vfs_getxattr(user_ns, dentry, xattr_name, NULL, 0);
 917 }
 918
 919 /**
 920  * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
 921  * @user_ns:    user namespace
 922  * @dentry:     dentry of file for getting xattrs
 923  * @xattr_name: name of xattr name to query
 924  * @xattr_buf:  destination buffer xattr value
 925  *
 926  * Return:      read xattr value length on success, otherwise error
 927  */
 928 ssize_t ksmbd_vfs_getxattr(struct user_namespace *user_ns,
 929                            struct dentry *dentry,
 930                            char *xattr_name, char **xattr_buf)
 931 {
 932         ssize_t xattr_len;
 933         char *buf;
 934
 935         *xattr_buf = NULL;
 936         xattr_len = ksmbd_vfs_xattr_len(user_ns, dentry, xattr_name);
 937         if (xattr_len < 0)
 938                 return xattr_len;
 939
 940         buf = kmalloc(xattr_len + 1, GFP_KERNEL);
 941         if (!buf)
 942                 return -ENOMEM;
 943
 944         xattr_len = vfs_getxattr(user_ns, dentry, xattr_name,
 945                                  (void *)buf, xattr_len);
 946         if (xattr_len > 0)
 947                 *xattr_buf = buf;
 948         else
 949                 kfree(buf);
 950         return xattr_len;
 951 }
 952
 953 /**
 954  * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
 955  * @user_ns:    user namespace
 956  * @dentry:     dentry to set XATTR at
 957  * @name:       xattr name for setxattr
 958  * @value:      xattr value to set
 959  * @size:       size of xattr value
 960  * @flags:      destination buffer length
 961  *
 962  * Return:      0 on success, otherwise error
 963  */
 964 int ksmbd_vfs_setxattr(struct user_namespace *user_ns,
 965                        struct dentry *dentry, const char *attr_name,
 966                        void *attr_value, size_t attr_size, int flags)
 967 {
 968         int err;
 969
 970         err = vfs_setxattr(user_ns,
 971                            dentry,
 972                            attr_name,
 973                            attr_value,
 974                            attr_size,
 975                            flags);
 976         if (err)
 977                 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
 978         return err;
 979 }
 980
 981 /**
 982  * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
 983  * @filp:       file pointer for IO
 984  * @options:    smb IO options
 985  */
 986 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
 987 {
 988         struct address_space *mapping;
 989
 990         mapping = filp->f_mapping;
 991
 992         if (!option || !mapping)
 993                 return;
 994
 995         if (option & FILE_WRITE_THROUGH_LE) {
 996                 filp->f_flags |= O_SYNC;
 997         } else if (option & FILE_SEQUENTIAL_ONLY_LE) {
 998                 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
 999                 spin_lock(&filp->f_lock);
1000                 filp->f_mode &= ~FMODE_RANDOM;
1001                 spin_unlock(&filp->f_lock);
1002         } else if (option & FILE_RANDOM_ACCESS_LE) {
1003                 spin_lock(&filp->f_lock);
1004                 filp->f_mode |= FMODE_RANDOM;
1005                 spin_unlock(&filp->f_lock);
1006         }
1007 }
1008
1009 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
1010                         loff_t off, loff_t len)
1011 {
1012         smb_break_all_levII_oplock(work, fp, 1);
1013         if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
1014                 return vfs_fallocate(fp->filp,
1015                                      FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
1016                                      off, len);
1017
1018         return vfs_fallocate(fp->filp,
1019                              FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
1020                              off, len);
1021 }
1022
1023 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
1024                          struct file_allocated_range_buffer *ranges,
1025                          unsigned int in_count, unsigned int *out_count)
1026 {
1027         struct file *f = fp->filp;
1028         struct inode *inode = file_inode(fp->filp);
1029         loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
1030         loff_t extent_start, extent_end;
1031         int ret = 0;
1032
1033         if (start > maxbytes)
1034                 return -EFBIG;
1035
1036         if (!in_count)
1037                 return 0;
1038
1039         /*
1040          * Shrink request scope to what the fs can actually handle.
1041          */
1042         if (length > maxbytes || (maxbytes - length) < start)
1043                 length = maxbytes - start;
1044
1045         if (start + length > inode->i_size)
1046                 length = inode->i_size - start;
1047
1048         *out_count = 0;
1049         end = start + length;
1050         while (start < end && *out_count < in_count) {
1051                 extent_start = vfs_llseek(f, start, SEEK_DATA);
1052                 if (extent_start < 0) {
1053                         if (extent_start != -ENXIO)
1054                                 ret = (int)extent_start;
1055                         break;
1056                 }
1057
1058                 if (extent_start >= end)
1059                         break;
1060
1061                 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
1062                 if (extent_end < 0) {
1063                         if (extent_end != -ENXIO)
1064                                 ret = (int)extent_end;
1065                         break;
1066                 } else if (extent_start >= extent_end) {
1067                         break;
1068                 }
1069
1070                 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1071                 ranges[(*out_count)++].length =
1072                         cpu_to_le64(min(extent_end, end) - extent_start);
1073
1074                 start = extent_end;
1075         }
1076
1077         return ret;
1078 }
1079
1080 int ksmbd_vfs_remove_xattr(struct user_namespace *user_ns,
1081                            struct dentry *dentry, char *attr_name)
1082 {
1083         return vfs_removexattr(user_ns, dentry, attr_name);
1084 }
1085
1086 int ksmbd_vfs_unlink(struct user_namespace *user_ns,
1087                      struct dentry *dir, struct dentry *dentry)
1088 {
1089         int err = 0;
1090
1091         err = ksmbd_vfs_lock_parent(user_ns, dir, dentry);
1092         if (err)
1093                 return err;
1094         dget(dentry);
1095
1096         if (S_ISDIR(d_inode(dentry)->i_mode))
1097                 err = vfs_rmdir(user_ns, d_inode(dir), dentry);
1098         else
1099                 err = vfs_unlink(user_ns, d_inode(dir), dentry, NULL);
1100
1101         dput(dentry);
1102         inode_unlock(d_inode(dir));
1103         if (err)
1104                 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1105
1106         return err;
1107 }
1108
1109 static int __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1110                        loff_t offset, u64 ino, unsigned int d_type)
1111 {
1112         struct ksmbd_readdir_data *buf;
1113
1114         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1115         buf->dirent_count++;
1116
1117         if (buf->dirent_count > 2)
1118                 return -ENOTEMPTY;
1119         return 0;
1120 }
1121
1122 /**
1123  * ksmbd_vfs_empty_dir() - check for empty directory
1124  * @fp: ksmbd file pointer
1125  *
1126  * Return:      true if directory empty, otherwise false
1127  */
1128 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1129 {
1130         int err;
1131         struct ksmbd_readdir_data readdir_data;
1132
1133         memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1134
1135         set_ctx_actor(&readdir_data.ctx, __dir_empty);
1136         readdir_data.dirent_count = 0;
1137
1138         err = iterate_dir(fp->filp, &readdir_data.ctx);
1139         if (readdir_data.dirent_count > 2)
1140                 err = -ENOTEMPTY;
1141         else
1142                 err = 0;
1143         return err;
1144 }
1145
1146 static int __caseless_lookup(struct dir_context *ctx, const char *name,
1147                              int namlen, loff_t offset, u64 ino,
1148                              unsigned int d_type)
1149 {
1150         struct ksmbd_readdir_data *buf;
1151
1152         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1153
1154         if (buf->used != namlen)
1155                 return 0;
1156         if (!strncasecmp((char *)buf->private, name, namlen)) {
1157                 memcpy((char *)buf->private, name, namlen);
1158                 buf->dirent_count = 1;
1159                 return -EEXIST;
1160         }
1161         return 0;
1162 }
1163
1164 /**
1165  * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1166  * @dir:        path info
1167  * @name:       filename to lookup
1168  * @namelen:    filename length
1169  *
1170  * Return:      0 on success, otherwise error
1171  */
1172 static int ksmbd_vfs_lookup_in_dir(struct path *dir, char *name, size_t namelen)
1173 {
1174         int ret;
1175         struct file *dfilp;
1176         int flags = O_RDONLY | O_LARGEFILE;
1177         struct ksmbd_readdir_data readdir_data = {
1178                 .ctx.actor      = __caseless_lookup,
1179                 .private        = name,
1180                 .used           = namelen,
1181                 .dirent_count   = 0,
1182         };
1183
1184         dfilp = dentry_open(dir, flags, current_cred());
1185         if (IS_ERR(dfilp))
1186                 return PTR_ERR(dfilp);
1187
1188         ret = iterate_dir(dfilp, &readdir_data.ctx);
1189         if (readdir_data.dirent_count > 0)
1190                 ret = 0;
1191         fput(dfilp);
1192         return ret;
1193 }
1194
1195 /**
1196  * ksmbd_vfs_kern_path() - lookup a file and get path info
1197  * @name:       file path that is relative to share
1198  * @flags:      lookup flags
1199  * @path:       if lookup succeed, return path info
1200  * @caseless:   caseless filename lookup
1201  *
1202  * Return:      0 on success, otherwise error
1203  */
1204 int ksmbd_vfs_kern_path(struct ksmbd_work *work, char *name,
1205                         unsigned int flags, struct path *path, bool caseless)
1206 {
1207         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1208         int err;
1209
1210         flags |= LOOKUP_BENEATH;
1211         err = vfs_path_lookup(share_conf->vfs_path.dentry,
1212                               share_conf->vfs_path.mnt,
1213                               name,
1214                               flags,
1215                               path);
1216         if (!err)
1217                 return 0;
1218
1219         if (caseless) {
1220                 char *filepath;
1221                 struct path parent;
1222                 size_t path_len, remain_len;
1223
1224                 filepath = kstrdup(name, GFP_KERNEL);
1225                 if (!filepath)
1226                         return -ENOMEM;
1227
1228                 path_len = strlen(filepath);
1229                 remain_len = path_len;
1230
1231                 parent = share_conf->vfs_path;
1232                 path_get(&parent);
1233
1234                 while (d_can_lookup(parent.dentry)) {
1235                         char *filename = filepath + path_len - remain_len;
1236                         char *next = strchrnul(filename, '/');
1237                         size_t filename_len = next - filename;
1238                         bool is_last = !next[0];
1239
1240                         if (filename_len == 0)
1241                                 break;
1242
1243                         err = ksmbd_vfs_lookup_in_dir(&parent, filename,
1244                                                       filename_len);
1245                         path_put(&parent);
1246                         if (err)
1247                                 goto out;
1248
1249                         next[0] = '\0';
1250
1251                         err = vfs_path_lookup(share_conf->vfs_path.dentry,
1252                                               share_conf->vfs_path.mnt,
1253                                               filepath,
1254                                               flags,
1255                                               &parent);
1256                         if (err)
1257                                 goto out;
1258                         else if (is_last) {
1259                                 *path = parent;
1260                                 goto out;
1261                         }
1262
1263                         next[0] = '/';
1264                         remain_len -= filename_len + 1;
1265                 }
1266
1267                 path_put(&parent);
1268                 err = -EINVAL;
1269 out:
1270                 kfree(filepath);
1271         }
1272         return err;
1273 }
1274
1275 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1276                                           const char *name,
1277                                           unsigned int flags,
1278                                           struct path *path)
1279 {
1280         char *abs_name;
1281         struct dentry *dent;
1282
1283         abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1284         if (!abs_name)
1285                 return ERR_PTR(-ENOMEM);
1286
1287         dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1288         kfree(abs_name);
1289         return dent;
1290 }
1291
1292 int ksmbd_vfs_remove_acl_xattrs(struct user_namespace *user_ns,
1293                                 struct dentry *dentry)
1294 {
1295         char *name, *xattr_list = NULL;
1296         ssize_t xattr_list_len;
1297         int err = 0;
1298
1299         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1300         if (xattr_list_len < 0) {
1301                 goto out;
1302         } else if (!xattr_list_len) {
1303                 ksmbd_debug(SMB, "empty xattr in the file\n");
1304                 goto out;
1305         }
1306
1307         for (name = xattr_list; name - xattr_list < xattr_list_len;
1308              name += strlen(name) + 1) {
1309                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1310
1311                 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1312                              sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1313                     !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1314                              sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1315                         err = ksmbd_vfs_remove_xattr(user_ns, dentry, name);
1316                         if (err)
1317                                 ksmbd_debug(SMB,
1318                                             "remove acl xattr failed : %s\n", name);
1319                 }
1320         }
1321 out:
1322         kvfree(xattr_list);
1323         return err;
1324 }
1325
1326 int ksmbd_vfs_remove_sd_xattrs(struct user_namespace *user_ns,
1327                                struct dentry *dentry)
1328 {
1329         char *name, *xattr_list = NULL;
1330         ssize_t xattr_list_len;
1331         int err = 0;
1332
1333         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1334         if (xattr_list_len < 0) {
1335                 goto out;
1336         } else if (!xattr_list_len) {
1337                 ksmbd_debug(SMB, "empty xattr in the file\n");
1338                 goto out;
1339         }
1340
1341         for (name = xattr_list; name - xattr_list < xattr_list_len;
1342                         name += strlen(name) + 1) {
1343                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1344
1345                 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1346                         err = ksmbd_vfs_remove_xattr(user_ns, dentry, name);
1347                         if (err)
1348                                 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1349                 }
1350         }
1351 out:
1352         kvfree(xattr_list);
1353         return err;
1354 }
1355
1356 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct user_namespace *user_ns,
1357                                                             struct inode *inode,
1358                                                             int acl_type)
1359 {
1360         struct xattr_smb_acl *smb_acl = NULL;
1361         struct posix_acl *posix_acls;
1362         struct posix_acl_entry *pa_entry;
1363         struct xattr_acl_entry *xa_entry;
1364         int i;
1365
1366         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1367                 return NULL;
1368
1369         posix_acls = get_acl(inode, acl_type);
1370         if (!posix_acls)
1371                 return NULL;
1372
1373         smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1374                           sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1375                           GFP_KERNEL);
1376         if (!smb_acl)
1377                 goto out;
1378
1379         smb_acl->count = posix_acls->a_count;
1380         pa_entry = posix_acls->a_entries;
1381         xa_entry = smb_acl->entries;
1382         for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1383                 switch (pa_entry->e_tag) {
1384                 case ACL_USER:
1385                         xa_entry->type = SMB_ACL_USER;
1386                         xa_entry->uid = posix_acl_uid_translate(user_ns, pa_entry);
1387                         break;
1388                 case ACL_USER_OBJ:
1389                         xa_entry->type = SMB_ACL_USER_OBJ;
1390                         break;
1391                 case ACL_GROUP:
1392                         xa_entry->type = SMB_ACL_GROUP;
1393                         xa_entry->gid = posix_acl_gid_translate(user_ns, pa_entry);
1394                         break;
1395                 case ACL_GROUP_OBJ:
1396                         xa_entry->type = SMB_ACL_GROUP_OBJ;
1397                         break;
1398                 case ACL_OTHER:
1399                         xa_entry->type = SMB_ACL_OTHER;
1400                         break;
1401                 case ACL_MASK:
1402                         xa_entry->type = SMB_ACL_MASK;
1403                         break;
1404                 default:
1405                         pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1406                         goto out;
1407                 }
1408
1409                 if (pa_entry->e_perm & ACL_READ)
1410                         xa_entry->perm |= SMB_ACL_READ;
1411                 if (pa_entry->e_perm & ACL_WRITE)
1412                         xa_entry->perm |= SMB_ACL_WRITE;
1413                 if (pa_entry->e_perm & ACL_EXECUTE)
1414                         xa_entry->perm |= SMB_ACL_EXECUTE;
1415         }
1416 out:
1417         posix_acl_release(posix_acls);
1418         return smb_acl;
1419 }
1420
1421 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1422                            struct user_namespace *user_ns,
1423                            struct dentry *dentry,
1424                            struct smb_ntsd *pntsd, int len)
1425 {
1426         int rc;
1427         struct ndr sd_ndr = {0}, acl_ndr = {0};
1428         struct xattr_ntacl acl = {0};
1429         struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1430         struct inode *inode = d_inode(dentry);
1431
1432         acl.version = 4;
1433         acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1434         acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1435
1436         memcpy(acl.desc, "posix_acl", 9);
1437         acl.desc_len = 10;
1438
1439         pntsd->osidoffset =
1440                 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1441         pntsd->gsidoffset =
1442                 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1443         pntsd->dacloffset =
1444                 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1445
1446         acl.sd_buf = (char *)pntsd;
1447         acl.sd_size = len;
1448
1449         rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1450         if (rc) {
1451                 pr_err("failed to generate hash for ndr acl\n");
1452                 return rc;
1453         }
1454
1455         smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1456                                                  ACL_TYPE_ACCESS);
1457         if (S_ISDIR(inode->i_mode))
1458                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1459                                                              ACL_TYPE_DEFAULT);
1460
1461         rc = ndr_encode_posix_acl(&acl_ndr, user_ns, inode,
1462                                   smb_acl, def_smb_acl);
1463         if (rc) {
1464                 pr_err("failed to encode ndr to posix acl\n");
1465                 goto out;
1466         }
1467
1468         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1469                                acl.posix_acl_hash);
1470         if (rc) {
1471                 pr_err("failed to generate hash for ndr acl\n");
1472                 goto out;
1473         }
1474
1475         rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1476         if (rc) {
1477                 pr_err("failed to encode ndr to posix acl\n");
1478                 goto out;
1479         }
1480
1481         rc = ksmbd_vfs_setxattr(user_ns, dentry,
1482                                 XATTR_NAME_SD, sd_ndr.data,
1483                                 sd_ndr.offset, 0);
1484         if (rc < 0)
1485                 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1486
1487         kfree(sd_ndr.data);
1488 out:
1489         kfree(acl_ndr.data);
1490         kfree(smb_acl);
1491         kfree(def_smb_acl);
1492         return rc;
1493 }
1494
1495 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1496                            struct user_namespace *user_ns,
1497                            struct dentry *dentry,
1498                            struct smb_ntsd **pntsd)
1499 {
1500         int rc;
1501         struct ndr n;
1502         struct inode *inode = d_inode(dentry);
1503         struct ndr acl_ndr = {0};
1504         struct xattr_ntacl acl;
1505         struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1506         __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1507
1508         rc = ksmbd_vfs_getxattr(user_ns, dentry, XATTR_NAME_SD, &n.data);
1509         if (rc <= 0)
1510                 return rc;
1511
1512         n.length = rc;
1513         rc = ndr_decode_v4_ntacl(&n, &acl);
1514         if (rc)
1515                 goto free_n_data;
1516
1517         smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1518                                                  ACL_TYPE_ACCESS);
1519         if (S_ISDIR(inode->i_mode))
1520                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1521                                                              ACL_TYPE_DEFAULT);
1522
1523         rc = ndr_encode_posix_acl(&acl_ndr, user_ns, inode, smb_acl,
1524                                   def_smb_acl);
1525         if (rc) {
1526                 pr_err("failed to encode ndr to posix acl\n");
1527                 goto out_free;
1528         }
1529
1530         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1531         if (rc) {
1532                 pr_err("failed to generate hash for ndr acl\n");
1533                 goto out_free;
1534         }
1535
1536         if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1537                 pr_err("hash value diff\n");
1538                 rc = -EINVAL;
1539                 goto out_free;
1540         }
1541
1542         *pntsd = acl.sd_buf;
1543         (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1544                                            NDR_NTSD_OFFSETOF);
1545         (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1546                                            NDR_NTSD_OFFSETOF);
1547         (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1548                                            NDR_NTSD_OFFSETOF);
1549
1550         rc = acl.sd_size;
1551 out_free:
1552         kfree(acl_ndr.data);
1553         kfree(smb_acl);
1554         kfree(def_smb_acl);
1555         if (rc < 0) {
1556                 kfree(acl.sd_buf);
1557                 *pntsd = NULL;
1558         }
1559
1560 free_n_data:
1561         kfree(n.data);
1562         return rc;
1563 }
1564
1565 int ksmbd_vfs_set_dos_attrib_xattr(struct user_namespace *user_ns,
1566                                    struct dentry *dentry,
1567                                    struct xattr_dos_attrib *da)
1568 {
1569         struct ndr n;
1570         int err;
1571
1572         err = ndr_encode_dos_attr(&n, da);
1573         if (err)
1574                 return err;
1575
1576         err = ksmbd_vfs_setxattr(user_ns, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1577                                  (void *)n.data, n.offset, 0);
1578         if (err)
1579                 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1580         kfree(n.data);
1581
1582         return err;
1583 }
1584
1585 int ksmbd_vfs_get_dos_attrib_xattr(struct user_namespace *user_ns,
1586                                    struct dentry *dentry,
1587                                    struct xattr_dos_attrib *da)
1588 {
1589         struct ndr n;
1590         int err;
1591
1592         err = ksmbd_vfs_getxattr(user_ns, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1593                                  (char **)&n.data);
1594         if (err > 0) {
1595                 n.length = err;
1596                 if (ndr_decode_dos_attr(&n, da))
1597                         err = -EINVAL;
1598                 kfree(n.data);
1599         } else {
1600                 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1601         }
1602
1603         return err;
1604 }
1605
1606 /**
1607  * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1608  * @p:          destination buffer
1609  * @ksmbd_kstat:      ksmbd kstat wrapper
1610  */
1611 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1612 {
1613         struct file_directory_info *info = (struct file_directory_info *)(*p);
1614         struct kstat *kstat = ksmbd_kstat->kstat;
1615         u64 time;
1616
1617         info->FileIndex = 0;
1618         info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1619         time = ksmbd_UnixTimeToNT(kstat->atime);
1620         info->LastAccessTime = cpu_to_le64(time);
1621         time = ksmbd_UnixTimeToNT(kstat->mtime);
1622         info->LastWriteTime = cpu_to_le64(time);
1623         time = ksmbd_UnixTimeToNT(kstat->ctime);
1624         info->ChangeTime = cpu_to_le64(time);
1625
1626         if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1627                 info->EndOfFile = 0;
1628                 info->AllocationSize = 0;
1629         } else {
1630                 info->EndOfFile = cpu_to_le64(kstat->size);
1631                 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1632         }
1633         info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1634
1635         return info;
1636 }
1637
1638 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1639                                 struct user_namespace *user_ns,
1640                                 struct dentry *dentry,
1641                                 struct ksmbd_kstat *ksmbd_kstat)
1642 {
1643         u64 time;
1644         int rc;
1645
1646         generic_fillattr(user_ns, d_inode(dentry), ksmbd_kstat->kstat);
1647
1648         time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1649         ksmbd_kstat->create_time = time;
1650
1651         /*
1652          * set default value for the case that store dos attributes is not yes
1653          * or that acl is disable in server's filesystem and the config is yes.
1654          */
1655         if (S_ISDIR(ksmbd_kstat->kstat->mode))
1656                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1657         else
1658                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1659
1660         if (test_share_config_flag(work->tcon->share_conf,
1661                                    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1662                 struct xattr_dos_attrib da;
1663
1664                 rc = ksmbd_vfs_get_dos_attrib_xattr(user_ns, dentry, &da);
1665                 if (rc > 0) {
1666                         ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1667                         ksmbd_kstat->create_time = da.create_time;
1668                 } else {
1669                         ksmbd_debug(VFS, "fail to load dos attribute.\n");
1670                 }
1671         }
1672
1673         return 0;
1674 }
1675
1676 ssize_t ksmbd_vfs_casexattr_len(struct user_namespace *user_ns,
1677                                 struct dentry *dentry, char *attr_name,
1678                                 int attr_name_len)
1679 {
1680         char *name, *xattr_list = NULL;
1681         ssize_t value_len = -ENOENT, xattr_list_len;
1682
1683         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1684         if (xattr_list_len <= 0)
1685                 goto out;
1686
1687         for (name = xattr_list; name - xattr_list < xattr_list_len;
1688                         name += strlen(name) + 1) {
1689                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1690                 if (strncasecmp(attr_name, name, attr_name_len))
1691                         continue;
1692
1693                 value_len = ksmbd_vfs_xattr_len(user_ns, dentry, name);
1694                 break;
1695         }
1696
1697 out:
1698         kvfree(xattr_list);
1699         return value_len;
1700 }
1701
1702 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1703                                 size_t *xattr_stream_name_size, int s_type)
1704 {
1705         char *type, *buf;
1706
1707         if (s_type == DIR_STREAM)
1708                 type = ":$INDEX_ALLOCATION";
1709         else
1710                 type = ":$DATA";
1711
1712         buf = kasprintf(GFP_KERNEL, "%s%s%s",
1713                         XATTR_NAME_STREAM, stream_name, type);
1714         if (!buf)
1715                 return -ENOMEM;
1716
1717         *xattr_stream_name = buf;
1718         *xattr_stream_name_size = strlen(buf) + 1;
1719
1720         return 0;
1721 }
1722
1723 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1724                                struct ksmbd_file *src_fp,
1725                                struct ksmbd_file *dst_fp,
1726                                struct srv_copychunk *chunks,
1727                                unsigned int chunk_count,
1728                                unsigned int *chunk_count_written,
1729                                unsigned int *chunk_size_written,
1730                                loff_t *total_size_written)
1731 {
1732         unsigned int i;
1733         loff_t src_off, dst_off, src_file_size;
1734         size_t len;
1735         int ret;
1736
1737         *chunk_count_written = 0;
1738         *chunk_size_written = 0;
1739         *total_size_written = 0;
1740
1741         if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1742                 pr_err("no right to read(%pd)\n", src_fp->filp->f_path.dentry);
1743                 return -EACCES;
1744         }
1745         if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1746                 pr_err("no right to write(%pd)\n", dst_fp->filp->f_path.dentry);
1747                 return -EACCES;
1748         }
1749
1750         if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1751                 return -EBADF;
1752
1753         smb_break_all_levII_oplock(work, dst_fp, 1);
1754
1755         if (!work->tcon->posix_extensions) {
1756                 for (i = 0; i < chunk_count; i++) {
1757                         src_off = le64_to_cpu(chunks[i].SourceOffset);
1758                         dst_off = le64_to_cpu(chunks[i].TargetOffset);
1759                         len = le32_to_cpu(chunks[i].Length);
1760
1761                         if (check_lock_range(src_fp->filp, src_off,
1762                                              src_off + len - 1, READ))
1763                                 return -EAGAIN;
1764                         if (check_lock_range(dst_fp->filp, dst_off,
1765                                              dst_off + len - 1, WRITE))
1766                                 return -EAGAIN;
1767                 }
1768         }
1769
1770         src_file_size = i_size_read(file_inode(src_fp->filp));
1771
1772         for (i = 0; i < chunk_count; i++) {
1773                 src_off = le64_to_cpu(chunks[i].SourceOffset);
1774                 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1775                 len = le32_to_cpu(chunks[i].Length);
1776
1777                 if (src_off + len > src_file_size)
1778                         return -E2BIG;
1779
1780                 ret = vfs_copy_file_range(src_fp->filp, src_off,
1781                                           dst_fp->filp, dst_off, len, 0);
1782                 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1783                         ret = generic_copy_file_range(src_fp->filp, src_off,
1784                                                       dst_fp->filp, dst_off,
1785                                                       len, 0);
1786                 if (ret < 0)
1787                         return ret;
1788
1789                 *chunk_count_written += 1;
1790                 *total_size_written += ret;
1791         }
1792         return 0;
1793 }
1794
1795 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1796 {
1797         wait_event(flock->fl_wait, !flock->fl_blocker);
1798 }
1799
1800 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1801 {
1802         return wait_event_interruptible_timeout(flock->fl_wait,
1803                                                 !flock->fl_blocker,
1804                                                 timeout);
1805 }
1806
1807 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1808 {
1809         locks_delete_block(flock);
1810 }
1811
1812 int ksmbd_vfs_set_init_posix_acl(struct user_namespace *user_ns,
1813                                  struct inode *inode)
1814 {
1815         struct posix_acl_state acl_state;
1816         struct posix_acl *acls;
1817         int rc;
1818
1819         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1820                 return -EOPNOTSUPP;
1821
1822         ksmbd_debug(SMB, "Set posix acls\n");
1823         rc = init_acl_state(&acl_state, 1);
1824         if (rc)
1825                 return rc;
1826
1827         /* Set default owner group */
1828         acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1829         acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1830         acl_state.other.allow = inode->i_mode & 0007;
1831         acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1832         acl_state.users->aces[acl_state.users->n++].perms.allow =
1833                 acl_state.owner.allow;
1834         acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1835         acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1836                 acl_state.group.allow;
1837         acl_state.mask.allow = 0x07;
1838
1839         acls = posix_acl_alloc(6, GFP_KERNEL);
1840         if (!acls) {
1841                 free_acl_state(&acl_state);
1842                 return -ENOMEM;
1843         }
1844         posix_state_to_acl(&acl_state, acls->a_entries);
1845         rc = set_posix_acl(user_ns, inode, ACL_TYPE_ACCESS, acls);
1846         if (rc < 0)
1847                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1848                             rc);
1849         else if (S_ISDIR(inode->i_mode)) {
1850                 posix_state_to_acl(&acl_state, acls->a_entries);
1851                 rc = set_posix_acl(user_ns, inode, ACL_TYPE_DEFAULT,
1852                                    acls);
1853                 if (rc < 0)
1854                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1855                                     rc);
1856         }
1857         free_acl_state(&acl_state);
1858         posix_acl_release(acls);
1859         return rc;
1860 }
1861
1862 int ksmbd_vfs_inherit_posix_acl(struct user_namespace *user_ns,
1863                                 struct inode *inode, struct inode *parent_inode)
1864 {
1865         struct posix_acl *acls;
1866         struct posix_acl_entry *pace;
1867         int rc, i;
1868
1869         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1870                 return -EOPNOTSUPP;
1871
1872         acls = get_acl(parent_inode, ACL_TYPE_DEFAULT);
1873         if (!acls)
1874                 return -ENOENT;
1875         pace = acls->a_entries;
1876
1877         for (i = 0; i < acls->a_count; i++, pace++) {
1878                 if (pace->e_tag == ACL_MASK) {
1879                         pace->e_perm = 0x07;
1880                         break;
1881                 }
1882         }
1883
1884         rc = set_posix_acl(user_ns, inode, ACL_TYPE_ACCESS, acls);
1885         if (rc < 0)
1886                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1887                             rc);
1888         if (S_ISDIR(inode->i_mode)) {
1889                 rc = set_posix_acl(user_ns, inode, ACL_TYPE_DEFAULT,
1890                                    acls);
1891                 if (rc < 0)
1892                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1893                                     rc);
1894         }
1895         posix_acl_release(acls);
1896         return rc;
1897 }