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                        const 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, FALLOC_FL_ZERO_RANGE, off, len);
1019 }
1020
1021 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
1022                          struct file_allocated_range_buffer *ranges,
1023                          unsigned int in_count, unsigned int *out_count)
1024 {
1025         struct file *f = fp->filp;
1026         struct inode *inode = file_inode(fp->filp);
1027         loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
1028         loff_t extent_start, extent_end;
1029         int ret = 0;
1030
1031         if (start > maxbytes)
1032                 return -EFBIG;
1033
1034         if (!in_count)
1035                 return 0;
1036
1037         /*
1038          * Shrink request scope to what the fs can actually handle.
1039          */
1040         if (length > maxbytes || (maxbytes - length) < start)
1041                 length = maxbytes - start;
1042
1043         if (start + length > inode->i_size)
1044                 length = inode->i_size - start;
1045
1046         *out_count = 0;
1047         end = start + length;
1048         while (start < end && *out_count < in_count) {
1049                 extent_start = f->f_op->llseek(f, start, SEEK_DATA);
1050                 if (extent_start < 0) {
1051                         if (extent_start != -ENXIO)
1052                                 ret = (int)extent_start;
1053                         break;
1054                 }
1055
1056                 if (extent_start >= end)
1057                         break;
1058
1059                 extent_end = f->f_op->llseek(f, extent_start, SEEK_HOLE);
1060                 if (extent_end < 0) {
1061                         if (extent_end != -ENXIO)
1062                                 ret = (int)extent_end;
1063                         break;
1064                 } else if (extent_start >= extent_end) {
1065                         break;
1066                 }
1067
1068                 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1069                 ranges[(*out_count)++].length =
1070                         cpu_to_le64(min(extent_end, end) - extent_start);
1071
1072                 start = extent_end;
1073         }
1074
1075         return ret;
1076 }
1077
1078 int ksmbd_vfs_remove_xattr(struct user_namespace *user_ns,
1079                            struct dentry *dentry, char *attr_name)
1080 {
1081         return vfs_removexattr(user_ns, dentry, attr_name);
1082 }
1083
1084 int ksmbd_vfs_unlink(struct user_namespace *user_ns,
1085                      struct dentry *dir, struct dentry *dentry)
1086 {
1087         int err = 0;
1088
1089         err = ksmbd_vfs_lock_parent(user_ns, dir, dentry);
1090         if (err)
1091                 return err;
1092         dget(dentry);
1093
1094         if (S_ISDIR(d_inode(dentry)->i_mode))
1095                 err = vfs_rmdir(user_ns, d_inode(dir), dentry);
1096         else
1097                 err = vfs_unlink(user_ns, d_inode(dir), dentry, NULL);
1098
1099         dput(dentry);
1100         inode_unlock(d_inode(dir));
1101         if (err)
1102                 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1103
1104         return err;
1105 }
1106
1107 static int __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1108                        loff_t offset, u64 ino, unsigned int d_type)
1109 {
1110         struct ksmbd_readdir_data *buf;
1111
1112         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1113         buf->dirent_count++;
1114
1115         if (buf->dirent_count > 2)
1116                 return -ENOTEMPTY;
1117         return 0;
1118 }
1119
1120 /**
1121  * ksmbd_vfs_empty_dir() - check for empty directory
1122  * @fp: ksmbd file pointer
1123  *
1124  * Return:      true if directory empty, otherwise false
1125  */
1126 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1127 {
1128         int err;
1129         struct ksmbd_readdir_data readdir_data;
1130
1131         memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1132
1133         set_ctx_actor(&readdir_data.ctx, __dir_empty);
1134         readdir_data.dirent_count = 0;
1135
1136         err = iterate_dir(fp->filp, &readdir_data.ctx);
1137         if (readdir_data.dirent_count > 2)
1138                 err = -ENOTEMPTY;
1139         else
1140                 err = 0;
1141         return err;
1142 }
1143
1144 static int __caseless_lookup(struct dir_context *ctx, const char *name,
1145                              int namlen, loff_t offset, u64 ino,
1146                              unsigned int d_type)
1147 {
1148         struct ksmbd_readdir_data *buf;
1149
1150         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1151
1152         if (buf->used != namlen)
1153                 return 0;
1154         if (!strncasecmp((char *)buf->private, name, namlen)) {
1155                 memcpy((char *)buf->private, name, namlen);
1156                 buf->dirent_count = 1;
1157                 return -EEXIST;
1158         }
1159         return 0;
1160 }
1161
1162 /**
1163  * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1164  * @dir:        path info
1165  * @name:       filename to lookup
1166  * @namelen:    filename length
1167  *
1168  * Return:      0 on success, otherwise error
1169  */
1170 static int ksmbd_vfs_lookup_in_dir(struct path *dir, char *name, size_t namelen)
1171 {
1172         int ret;
1173         struct file *dfilp;
1174         int flags = O_RDONLY | O_LARGEFILE;
1175         struct ksmbd_readdir_data readdir_data = {
1176                 .ctx.actor      = __caseless_lookup,
1177                 .private        = name,
1178                 .used           = namelen,
1179                 .dirent_count   = 0,
1180         };
1181
1182         dfilp = dentry_open(dir, flags, current_cred());
1183         if (IS_ERR(dfilp))
1184                 return PTR_ERR(dfilp);
1185
1186         ret = iterate_dir(dfilp, &readdir_data.ctx);
1187         if (readdir_data.dirent_count > 0)
1188                 ret = 0;
1189         fput(dfilp);
1190         return ret;
1191 }
1192
1193 /**
1194  * ksmbd_vfs_kern_path() - lookup a file and get path info
1195  * @name:       file path that is relative to share
1196  * @flags:      lookup flags
1197  * @path:       if lookup succeed, return path info
1198  * @caseless:   caseless filename lookup
1199  *
1200  * Return:      0 on success, otherwise error
1201  */
1202 int ksmbd_vfs_kern_path(struct ksmbd_work *work, char *name,
1203                         unsigned int flags, struct path *path, bool caseless)
1204 {
1205         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1206         int err;
1207
1208         flags |= LOOKUP_BENEATH;
1209         err = vfs_path_lookup(share_conf->vfs_path.dentry,
1210                               share_conf->vfs_path.mnt,
1211                               name,
1212                               flags,
1213                               path);
1214         if (!err)
1215                 return 0;
1216
1217         if (caseless) {
1218                 char *filepath;
1219                 struct path parent;
1220                 size_t path_len, remain_len;
1221
1222                 filepath = kstrdup(name, GFP_KERNEL);
1223                 if (!filepath)
1224                         return -ENOMEM;
1225
1226                 path_len = strlen(filepath);
1227                 remain_len = path_len;
1228
1229                 parent = share_conf->vfs_path;
1230                 path_get(&parent);
1231
1232                 while (d_can_lookup(parent.dentry)) {
1233                         char *filename = filepath + path_len - remain_len;
1234                         char *next = strchrnul(filename, '/');
1235                         size_t filename_len = next - filename;
1236                         bool is_last = !next[0];
1237
1238                         if (filename_len == 0)
1239                                 break;
1240
1241                         err = ksmbd_vfs_lookup_in_dir(&parent, filename,
1242                                                       filename_len);
1243                         path_put(&parent);
1244                         if (err)
1245                                 goto out;
1246
1247                         next[0] = '\0';
1248
1249                         err = vfs_path_lookup(share_conf->vfs_path.dentry,
1250                                               share_conf->vfs_path.mnt,
1251                                               filepath,
1252                                               flags,
1253                                               &parent);
1254                         if (err)
1255                                 goto out;
1256                         else if (is_last) {
1257                                 *path = parent;
1258                                 goto out;
1259                         }
1260
1261                         next[0] = '/';
1262                         remain_len -= filename_len + 1;
1263                 }
1264
1265                 path_put(&parent);
1266                 err = -EINVAL;
1267 out:
1268                 kfree(filepath);
1269         }
1270         return err;
1271 }
1272
1273 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1274                                           const char *name,
1275                                           unsigned int flags,
1276                                           struct path *path)
1277 {
1278         char *abs_name;
1279         struct dentry *dent;
1280
1281         abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1282         if (!abs_name)
1283                 return ERR_PTR(-ENOMEM);
1284
1285         dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1286         kfree(abs_name);
1287         return dent;
1288 }
1289
1290 int ksmbd_vfs_remove_acl_xattrs(struct user_namespace *user_ns,
1291                                 struct dentry *dentry)
1292 {
1293         char *name, *xattr_list = NULL;
1294         ssize_t xattr_list_len;
1295         int err = 0;
1296
1297         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1298         if (xattr_list_len < 0) {
1299                 goto out;
1300         } else if (!xattr_list_len) {
1301                 ksmbd_debug(SMB, "empty xattr in the file\n");
1302                 goto out;
1303         }
1304
1305         for (name = xattr_list; name - xattr_list < xattr_list_len;
1306              name += strlen(name) + 1) {
1307                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1308
1309                 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1310                              sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1311                     !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1312                              sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1313                         err = ksmbd_vfs_remove_xattr(user_ns, dentry, name);
1314                         if (err)
1315                                 ksmbd_debug(SMB,
1316                                             "remove acl xattr failed : %s\n", name);
1317                 }
1318         }
1319 out:
1320         kvfree(xattr_list);
1321         return err;
1322 }
1323
1324 int ksmbd_vfs_remove_sd_xattrs(struct user_namespace *user_ns,
1325                                struct dentry *dentry)
1326 {
1327         char *name, *xattr_list = NULL;
1328         ssize_t xattr_list_len;
1329         int err = 0;
1330
1331         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1332         if (xattr_list_len < 0) {
1333                 goto out;
1334         } else if (!xattr_list_len) {
1335                 ksmbd_debug(SMB, "empty xattr in the file\n");
1336                 goto out;
1337         }
1338
1339         for (name = xattr_list; name - xattr_list < xattr_list_len;
1340                         name += strlen(name) + 1) {
1341                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1342
1343                 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1344                         err = ksmbd_vfs_remove_xattr(user_ns, dentry, name);
1345                         if (err)
1346                                 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1347                 }
1348         }
1349 out:
1350         kvfree(xattr_list);
1351         return err;
1352 }
1353
1354 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct user_namespace *user_ns,
1355                                                             struct inode *inode,
1356                                                             int acl_type)
1357 {
1358         struct xattr_smb_acl *smb_acl = NULL;
1359         struct posix_acl *posix_acls;
1360         struct posix_acl_entry *pa_entry;
1361         struct xattr_acl_entry *xa_entry;
1362         int i;
1363
1364         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1365                 return NULL;
1366
1367         posix_acls = get_acl(inode, acl_type);
1368         if (!posix_acls)
1369                 return NULL;
1370
1371         smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1372                           sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1373                           GFP_KERNEL);
1374         if (!smb_acl)
1375                 goto out;
1376
1377         smb_acl->count = posix_acls->a_count;
1378         pa_entry = posix_acls->a_entries;
1379         xa_entry = smb_acl->entries;
1380         for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1381                 switch (pa_entry->e_tag) {
1382                 case ACL_USER:
1383                         xa_entry->type = SMB_ACL_USER;
1384                         xa_entry->uid = posix_acl_uid_translate(user_ns, pa_entry);
1385                         break;
1386                 case ACL_USER_OBJ:
1387                         xa_entry->type = SMB_ACL_USER_OBJ;
1388                         break;
1389                 case ACL_GROUP:
1390                         xa_entry->type = SMB_ACL_GROUP;
1391                         xa_entry->gid = posix_acl_gid_translate(user_ns, pa_entry);
1392                         break;
1393                 case ACL_GROUP_OBJ:
1394                         xa_entry->type = SMB_ACL_GROUP_OBJ;
1395                         break;
1396                 case ACL_OTHER:
1397                         xa_entry->type = SMB_ACL_OTHER;
1398                         break;
1399                 case ACL_MASK:
1400                         xa_entry->type = SMB_ACL_MASK;
1401                         break;
1402                 default:
1403                         pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1404                         goto out;
1405                 }
1406
1407                 if (pa_entry->e_perm & ACL_READ)
1408                         xa_entry->perm |= SMB_ACL_READ;
1409                 if (pa_entry->e_perm & ACL_WRITE)
1410                         xa_entry->perm |= SMB_ACL_WRITE;
1411                 if (pa_entry->e_perm & ACL_EXECUTE)
1412                         xa_entry->perm |= SMB_ACL_EXECUTE;
1413         }
1414 out:
1415         posix_acl_release(posix_acls);
1416         return smb_acl;
1417 }
1418
1419 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1420                            struct user_namespace *user_ns,
1421                            struct dentry *dentry,
1422                            struct smb_ntsd *pntsd, int len)
1423 {
1424         int rc;
1425         struct ndr sd_ndr = {0}, acl_ndr = {0};
1426         struct xattr_ntacl acl = {0};
1427         struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1428         struct inode *inode = d_inode(dentry);
1429
1430         acl.version = 4;
1431         acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1432         acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1433
1434         memcpy(acl.desc, "posix_acl", 9);
1435         acl.desc_len = 10;
1436
1437         pntsd->osidoffset =
1438                 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1439         pntsd->gsidoffset =
1440                 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1441         pntsd->dacloffset =
1442                 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1443
1444         acl.sd_buf = (char *)pntsd;
1445         acl.sd_size = len;
1446
1447         rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1448         if (rc) {
1449                 pr_err("failed to generate hash for ndr acl\n");
1450                 return rc;
1451         }
1452
1453         smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1454                                                  ACL_TYPE_ACCESS);
1455         if (S_ISDIR(inode->i_mode))
1456                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1457                                                              ACL_TYPE_DEFAULT);
1458
1459         rc = ndr_encode_posix_acl(&acl_ndr, user_ns, inode,
1460                                   smb_acl, def_smb_acl);
1461         if (rc) {
1462                 pr_err("failed to encode ndr to posix acl\n");
1463                 goto out;
1464         }
1465
1466         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1467                                acl.posix_acl_hash);
1468         if (rc) {
1469                 pr_err("failed to generate hash for ndr acl\n");
1470                 goto out;
1471         }
1472
1473         rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1474         if (rc) {
1475                 pr_err("failed to encode ndr to posix acl\n");
1476                 goto out;
1477         }
1478
1479         rc = ksmbd_vfs_setxattr(user_ns, dentry,
1480                                 XATTR_NAME_SD, sd_ndr.data,
1481                                 sd_ndr.offset, 0);
1482         if (rc < 0)
1483                 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1484
1485         kfree(sd_ndr.data);
1486 out:
1487         kfree(acl_ndr.data);
1488         kfree(smb_acl);
1489         kfree(def_smb_acl);
1490         return rc;
1491 }
1492
1493 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1494                            struct user_namespace *user_ns,
1495                            struct dentry *dentry,
1496                            struct smb_ntsd **pntsd)
1497 {
1498         int rc;
1499         struct ndr n;
1500         struct inode *inode = d_inode(dentry);
1501         struct ndr acl_ndr = {0};
1502         struct xattr_ntacl acl;
1503         struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1504         __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1505
1506         rc = ksmbd_vfs_getxattr(user_ns, dentry, XATTR_NAME_SD, &n.data);
1507         if (rc <= 0)
1508                 return rc;
1509
1510         n.length = rc;
1511         rc = ndr_decode_v4_ntacl(&n, &acl);
1512         if (rc)
1513                 goto free_n_data;
1514
1515         smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1516                                                  ACL_TYPE_ACCESS);
1517         if (S_ISDIR(inode->i_mode))
1518                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1519                                                              ACL_TYPE_DEFAULT);
1520
1521         rc = ndr_encode_posix_acl(&acl_ndr, user_ns, inode, smb_acl,
1522                                   def_smb_acl);
1523         if (rc) {
1524                 pr_err("failed to encode ndr to posix acl\n");
1525                 goto out_free;
1526         }
1527
1528         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1529         if (rc) {
1530                 pr_err("failed to generate hash for ndr acl\n");
1531                 goto out_free;
1532         }
1533
1534         if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1535                 pr_err("hash value diff\n");
1536                 rc = -EINVAL;
1537                 goto out_free;
1538         }
1539
1540         *pntsd = acl.sd_buf;
1541         (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1542                                            NDR_NTSD_OFFSETOF);
1543         (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1544                                            NDR_NTSD_OFFSETOF);
1545         (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1546                                            NDR_NTSD_OFFSETOF);
1547
1548         rc = acl.sd_size;
1549 out_free:
1550         kfree(acl_ndr.data);
1551         kfree(smb_acl);
1552         kfree(def_smb_acl);
1553         if (rc < 0) {
1554                 kfree(acl.sd_buf);
1555                 *pntsd = NULL;
1556         }
1557
1558 free_n_data:
1559         kfree(n.data);
1560         return rc;
1561 }
1562
1563 int ksmbd_vfs_set_dos_attrib_xattr(struct user_namespace *user_ns,
1564                                    struct dentry *dentry,
1565                                    struct xattr_dos_attrib *da)
1566 {
1567         struct ndr n;
1568         int err;
1569
1570         err = ndr_encode_dos_attr(&n, da);
1571         if (err)
1572                 return err;
1573
1574         err = ksmbd_vfs_setxattr(user_ns, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1575                                  (void *)n.data, n.offset, 0);
1576         if (err)
1577                 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1578         kfree(n.data);
1579
1580         return err;
1581 }
1582
1583 int ksmbd_vfs_get_dos_attrib_xattr(struct user_namespace *user_ns,
1584                                    struct dentry *dentry,
1585                                    struct xattr_dos_attrib *da)
1586 {
1587         struct ndr n;
1588         int err;
1589
1590         err = ksmbd_vfs_getxattr(user_ns, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1591                                  (char **)&n.data);
1592         if (err > 0) {
1593                 n.length = err;
1594                 if (ndr_decode_dos_attr(&n, da))
1595                         err = -EINVAL;
1596                 kfree(n.data);
1597         } else {
1598                 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1599         }
1600
1601         return err;
1602 }
1603
1604 /**
1605  * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1606  * @p:          destination buffer
1607  * @ksmbd_kstat:      ksmbd kstat wrapper
1608  */
1609 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1610 {
1611         struct file_directory_info *info = (struct file_directory_info *)(*p);
1612         struct kstat *kstat = ksmbd_kstat->kstat;
1613         u64 time;
1614
1615         info->FileIndex = 0;
1616         info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1617         time = ksmbd_UnixTimeToNT(kstat->atime);
1618         info->LastAccessTime = cpu_to_le64(time);
1619         time = ksmbd_UnixTimeToNT(kstat->mtime);
1620         info->LastWriteTime = cpu_to_le64(time);
1621         time = ksmbd_UnixTimeToNT(kstat->ctime);
1622         info->ChangeTime = cpu_to_le64(time);
1623
1624         if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1625                 info->EndOfFile = 0;
1626                 info->AllocationSize = 0;
1627         } else {
1628                 info->EndOfFile = cpu_to_le64(kstat->size);
1629                 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1630         }
1631         info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1632
1633         return info;
1634 }
1635
1636 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1637                                 struct user_namespace *user_ns,
1638                                 struct dentry *dentry,
1639                                 struct ksmbd_kstat *ksmbd_kstat)
1640 {
1641         u64 time;
1642         int rc;
1643
1644         generic_fillattr(user_ns, d_inode(dentry), ksmbd_kstat->kstat);
1645
1646         time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1647         ksmbd_kstat->create_time = time;
1648
1649         /*
1650          * set default value for the case that store dos attributes is not yes
1651          * or that acl is disable in server's filesystem and the config is yes.
1652          */
1653         if (S_ISDIR(ksmbd_kstat->kstat->mode))
1654                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1655         else
1656                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1657
1658         if (test_share_config_flag(work->tcon->share_conf,
1659                                    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1660                 struct xattr_dos_attrib da;
1661
1662                 rc = ksmbd_vfs_get_dos_attrib_xattr(user_ns, dentry, &da);
1663                 if (rc > 0) {
1664                         ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1665                         ksmbd_kstat->create_time = da.create_time;
1666                 } else {
1667                         ksmbd_debug(VFS, "fail to load dos attribute.\n");
1668                 }
1669         }
1670
1671         return 0;
1672 }
1673
1674 ssize_t ksmbd_vfs_casexattr_len(struct user_namespace *user_ns,
1675                                 struct dentry *dentry, char *attr_name,
1676                                 int attr_name_len)
1677 {
1678         char *name, *xattr_list = NULL;
1679         ssize_t value_len = -ENOENT, xattr_list_len;
1680
1681         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1682         if (xattr_list_len <= 0)
1683                 goto out;
1684
1685         for (name = xattr_list; name - xattr_list < xattr_list_len;
1686                         name += strlen(name) + 1) {
1687                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1688                 if (strncasecmp(attr_name, name, attr_name_len))
1689                         continue;
1690
1691                 value_len = ksmbd_vfs_xattr_len(user_ns, dentry, name);
1692                 break;
1693         }
1694
1695 out:
1696         kvfree(xattr_list);
1697         return value_len;
1698 }
1699
1700 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1701                                 size_t *xattr_stream_name_size, int s_type)
1702 {
1703         char *type, *buf;
1704
1705         if (s_type == DIR_STREAM)
1706                 type = ":$INDEX_ALLOCATION";
1707         else
1708                 type = ":$DATA";
1709
1710         buf = kasprintf(GFP_KERNEL, "%s%s%s",
1711                         XATTR_NAME_STREAM, stream_name, type);
1712         if (!buf)
1713                 return -ENOMEM;
1714
1715         *xattr_stream_name = buf;
1716         *xattr_stream_name_size = strlen(buf) + 1;
1717
1718         return 0;
1719 }
1720
1721 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1722                                struct ksmbd_file *src_fp,
1723                                struct ksmbd_file *dst_fp,
1724                                struct srv_copychunk *chunks,
1725                                unsigned int chunk_count,
1726                                unsigned int *chunk_count_written,
1727                                unsigned int *chunk_size_written,
1728                                loff_t *total_size_written)
1729 {
1730         unsigned int i;
1731         loff_t src_off, dst_off, src_file_size;
1732         size_t len;
1733         int ret;
1734
1735         *chunk_count_written = 0;
1736         *chunk_size_written = 0;
1737         *total_size_written = 0;
1738
1739         if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1740                 pr_err("no right to read(%pd)\n", src_fp->filp->f_path.dentry);
1741                 return -EACCES;
1742         }
1743         if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1744                 pr_err("no right to write(%pd)\n", dst_fp->filp->f_path.dentry);
1745                 return -EACCES;
1746         }
1747
1748         if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1749                 return -EBADF;
1750
1751         smb_break_all_levII_oplock(work, dst_fp, 1);
1752
1753         if (!work->tcon->posix_extensions) {
1754                 for (i = 0; i < chunk_count; i++) {
1755                         src_off = le64_to_cpu(chunks[i].SourceOffset);
1756                         dst_off = le64_to_cpu(chunks[i].TargetOffset);
1757                         len = le32_to_cpu(chunks[i].Length);
1758
1759                         if (check_lock_range(src_fp->filp, src_off,
1760                                              src_off + len - 1, READ))
1761                                 return -EAGAIN;
1762                         if (check_lock_range(dst_fp->filp, dst_off,
1763                                              dst_off + len - 1, WRITE))
1764                                 return -EAGAIN;
1765                 }
1766         }
1767
1768         src_file_size = i_size_read(file_inode(src_fp->filp));
1769
1770         for (i = 0; i < chunk_count; i++) {
1771                 src_off = le64_to_cpu(chunks[i].SourceOffset);
1772                 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1773                 len = le32_to_cpu(chunks[i].Length);
1774
1775                 if (src_off + len > src_file_size)
1776                         return -E2BIG;
1777
1778                 ret = vfs_copy_file_range(src_fp->filp, src_off,
1779                                           dst_fp->filp, dst_off, len, 0);
1780                 if (ret < 0)
1781                         return ret;
1782
1783                 *chunk_count_written += 1;
1784                 *total_size_written += ret;
1785         }
1786         return 0;
1787 }
1788
1789 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1790 {
1791         wait_event(flock->fl_wait, !flock->fl_blocker);
1792 }
1793
1794 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1795 {
1796         return wait_event_interruptible_timeout(flock->fl_wait,
1797                                                 !flock->fl_blocker,
1798                                                 timeout);
1799 }
1800
1801 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1802 {
1803         locks_delete_block(flock);
1804 }
1805
1806 int ksmbd_vfs_set_init_posix_acl(struct user_namespace *user_ns,
1807                                  struct inode *inode)
1808 {
1809         struct posix_acl_state acl_state;
1810         struct posix_acl *acls;
1811         int rc;
1812
1813         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1814                 return -EOPNOTSUPP;
1815
1816         ksmbd_debug(SMB, "Set posix acls\n");
1817         rc = init_acl_state(&acl_state, 1);
1818         if (rc)
1819                 return rc;
1820
1821         /* Set default owner group */
1822         acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1823         acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1824         acl_state.other.allow = inode->i_mode & 0007;
1825         acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1826         acl_state.users->aces[acl_state.users->n++].perms.allow =
1827                 acl_state.owner.allow;
1828         acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1829         acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1830                 acl_state.group.allow;
1831         acl_state.mask.allow = 0x07;
1832
1833         acls = posix_acl_alloc(6, GFP_KERNEL);
1834         if (!acls) {
1835                 free_acl_state(&acl_state);
1836                 return -ENOMEM;
1837         }
1838         posix_state_to_acl(&acl_state, acls->a_entries);
1839         rc = set_posix_acl(user_ns, inode, ACL_TYPE_ACCESS, acls);
1840         if (rc < 0)
1841                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1842                             rc);
1843         else if (S_ISDIR(inode->i_mode)) {
1844                 posix_state_to_acl(&acl_state, acls->a_entries);
1845                 rc = set_posix_acl(user_ns, inode, ACL_TYPE_DEFAULT,
1846                                    acls);
1847                 if (rc < 0)
1848                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1849                                     rc);
1850         }
1851         free_acl_state(&acl_state);
1852         posix_acl_release(acls);
1853         return rc;
1854 }
1855
1856 int ksmbd_vfs_inherit_posix_acl(struct user_namespace *user_ns,
1857                                 struct inode *inode, struct inode *parent_inode)
1858 {
1859         struct posix_acl *acls;
1860         struct posix_acl_entry *pace;
1861         int rc, i;
1862
1863         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1864                 return -EOPNOTSUPP;
1865
1866         acls = get_acl(parent_inode, ACL_TYPE_DEFAULT);
1867         if (!acls)
1868                 return -ENOENT;
1869         pace = acls->a_entries;
1870
1871         for (i = 0; i < acls->a_count; i++, pace++) {
1872                 if (pace->e_tag == ACL_MASK) {
1873                         pace->e_perm = 0x07;
1874                         break;
1875                 }
1876         }
1877
1878         rc = set_posix_acl(user_ns, inode, ACL_TYPE_ACCESS, acls);
1879         if (rc < 0)
1880                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1881                             rc);
1882         if (S_ISDIR(inode->i_mode)) {
1883                 rc = set_posix_acl(user_ns, inode, ACL_TYPE_DEFAULT,
1884                                    acls);
1885                 if (rc < 0)
1886                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1887                                     rc);
1888         }
1889         posix_acl_release(acls);
1890         return rc;
1891 }