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