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