fs/smb/server/vfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
   4  *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/fs.h>
   9 #include <linux/uaccess.h>
  10 #include <linux/backing-dev.h>
  11 #include <linux/writeback.h>
  12 #include <linux/xattr.h>
  13 #include <linux/falloc.h>
  14 #include <linux/fsnotify.h>
  15 #include <linux/dcache.h>
  16 #include <linux/slab.h>
  17 #include <linux/vmalloc.h>
  18 #include <linux/sched/xacct.h>
  19 #include <linux/crc32c.h>
  20 #include <linux/namei.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 void ksmbd_vfs_inherit_owner(struct ksmbd_work *work,
  41                                     struct inode *parent_inode,
  42                                     struct inode *inode)
  43 {
  44         if (!test_share_config_flag(work->tcon->share_conf,
  45                                     KSMBD_SHARE_FLAG_INHERIT_OWNER))
  46                 return;
  47
  48         i_uid_write(inode, i_uid_read(parent_inode));
  49 }
  50
  51 /**
  52  * ksmbd_vfs_lock_parent() - lock parent dentry if it is stable
  53  */
  54 int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child)
  55 {
  56         inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
  57         if (child->d_parent != parent) {
  58                 inode_unlock(d_inode(parent));
  59                 return -ENOENT;
  60         }
  61
  62         return 0;
  63 }
  64
  65 static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf,
  66                                         char *pathname, unsigned int flags,
  67                                         struct path *parent_path,
  68                                         struct path *path)
  69 {
  70         struct qstr last;
  71         struct filename *filename;
  72         struct path *root_share_path = &share_conf->vfs_path;
  73         int err, type;
  74         struct dentry *d;
  75
  76         if (pathname[0] == '\0') {
  77                 pathname = share_conf->path;
  78                 root_share_path = NULL;
  79         } else {
  80                 flags |= LOOKUP_BENEATH;
  81         }
  82
  83         filename = getname_kernel(pathname);
  84         if (IS_ERR(filename))
  85                 return PTR_ERR(filename);
  86
  87         err = vfs_path_parent_lookup(filename, flags,
  88                                      parent_path, &last, &type,
  89                                      root_share_path);
  90         if (err) {
  91                 putname(filename);
  92                 return err;
  93         }
  94
  95         if (unlikely(type != LAST_NORM)) {
  96                 path_put(parent_path);
  97                 putname(filename);
  98                 return -ENOENT;
  99         }
 100
 101         err = mnt_want_write(parent_path->mnt);
 102         if (err) {
 103                 path_put(parent_path);
 104                 putname(filename);
 105                 return -ENOENT;
 106         }
 107
 108         inode_lock_nested(parent_path->dentry->d_inode, I_MUTEX_PARENT);
 109         d = lookup_one_qstr_excl(&last, parent_path->dentry, 0);
 110         if (IS_ERR(d))
 111                 goto err_out;
 112
 113         if (d_is_negative(d)) {
 114                 dput(d);
 115                 goto err_out;
 116         }
 117
 118         path->dentry = d;
 119         path->mnt = mntget(parent_path->mnt);
 120
 121         if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) {
 122                 err = follow_down(path);
 123                 if (err < 0) {
 124                         path_put(path);
 125                         goto err_out;
 126                 }
 127         }
 128
 129         putname(filename);
 130         return 0;
 131
 132 err_out:
 133         inode_unlock(d_inode(parent_path->dentry));
 134         mnt_drop_write(parent_path->mnt);
 135         path_put(parent_path);
 136         putname(filename);
 137         return -ENOENT;
 138 }
 139
 140 void ksmbd_vfs_query_maximal_access(struct user_namespace *user_ns,
 141                                    struct dentry *dentry, __le32 *daccess)
 142 {
 143         *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
 144
 145         if (!inode_permission(user_ns, d_inode(dentry), MAY_OPEN | MAY_WRITE))
 146                 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
 147                                 FILE_WRITE_DATA | FILE_APPEND_DATA |
 148                                 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
 149                                 FILE_DELETE_CHILD);
 150
 151         if (!inode_permission(user_ns, d_inode(dentry), MAY_OPEN | MAY_READ))
 152                 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
 153
 154         if (!inode_permission(user_ns, d_inode(dentry), MAY_OPEN | MAY_EXEC))
 155                 *daccess |= FILE_EXECUTE_LE;
 156
 157         if (!inode_permission(user_ns, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE))
 158                 *daccess |= FILE_DELETE_LE;
 159 }
 160
 161 /**
 162  * ksmbd_vfs_create() - vfs helper for smb create file
 163  * @work:       work
 164  * @name:       file name that is relative to share
 165  * @mode:       file create mode
 166  *
 167  * Return:      0 on success, otherwise error
 168  */
 169 int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
 170 {
 171         struct path path;
 172         struct dentry *dentry;
 173         int err;
 174
 175         dentry = ksmbd_vfs_kern_path_create(work, name,
 176                                             LOOKUP_NO_SYMLINKS, &path);
 177         if (IS_ERR(dentry)) {
 178                 err = PTR_ERR(dentry);
 179                 if (err != -ENOENT)
 180                         pr_err("path create failed for %s, err %d\n",
 181                                name, err);
 182                 return err;
 183         }
 184
 185         mode |= S_IFREG;
 186         err = vfs_create(mnt_user_ns(path.mnt), d_inode(path.dentry),
 187                          dentry, mode, true);
 188         if (!err) {
 189                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
 190                                         d_inode(dentry));
 191         } else {
 192                 pr_err("File(%s): creation failed (err:%d)\n", name, err);
 193         }
 194
 195         done_path_create(&path, dentry);
 196         return err;
 197 }
 198
 199 /**
 200  * ksmbd_vfs_mkdir() - vfs helper for smb create directory
 201  * @work:       work
 202  * @name:       directory name that is relative to share
 203  * @mode:       directory create mode
 204  *
 205  * Return:      0 on success, otherwise error
 206  */
 207 int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
 208 {
 209         struct user_namespace *user_ns;
 210         struct path path;
 211         struct dentry *dentry;
 212         int err;
 213
 214         dentry = ksmbd_vfs_kern_path_create(work, name,
 215                                             LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
 216                                             &path);
 217         if (IS_ERR(dentry)) {
 218                 err = PTR_ERR(dentry);
 219                 if (err != -EEXIST)
 220                         ksmbd_debug(VFS, "path create failed for %s, err %d\n",
 221                                     name, err);
 222                 return err;
 223         }
 224
 225         user_ns = mnt_user_ns(path.mnt);
 226         mode |= S_IFDIR;
 227         err = vfs_mkdir(user_ns, d_inode(path.dentry), dentry, mode);
 228         if (!err && d_unhashed(dentry)) {
 229                 struct dentry *d;
 230
 231                 d = lookup_one(user_ns, dentry->d_name.name, dentry->d_parent,
 232                                dentry->d_name.len);
 233                 if (IS_ERR(d)) {
 234                         err = PTR_ERR(d);
 235                         goto out_err;
 236                 }
 237                 if (unlikely(d_is_negative(d))) {
 238                         dput(d);
 239                         err = -ENOENT;
 240                         goto out_err;
 241                 }
 242
 243                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
 244                 dput(d);
 245         }
 246
 247 out_err:
 248         done_path_create(&path, dentry);
 249         if (err)
 250                 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err);
 251         return err;
 252 }
 253
 254 static ssize_t ksmbd_vfs_getcasexattr(struct user_namespace *user_ns,
 255                                       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(user_ns,
 272                                                dentry,
 273                                                name,
 274                                                attr_value);
 275                 if (value_len < 0)
 276                         pr_err("failed to get xattr in file\n");
 277                 break;
 278         }
 279
 280 out:
 281         kvfree(xattr_list);
 282         return value_len;
 283 }
 284
 285 static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
 286                                  size_t count)
 287 {
 288         ssize_t v_len;
 289         char *stream_buf = NULL;
 290
 291         ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
 292                     *pos, count);
 293
 294         v_len = ksmbd_vfs_getcasexattr(file_mnt_user_ns(fp->filp),
 295                                        fp->filp->f_path.dentry,
 296                                        fp->stream.name,
 297                                        fp->stream.size,
 298                                        &stream_buf);
 299         if ((int)v_len <= 0)
 300                 return (int)v_len;
 301
 302         if (v_len <= *pos) {
 303                 count = -EINVAL;
 304                 goto free_buf;
 305         }
 306
 307         if (v_len - *pos < count)
 308                 count = v_len - *pos;
 309
 310         memcpy(buf, &stream_buf[*pos], count);
 311
 312 free_buf:
 313         kvfree(stream_buf);
 314         return count;
 315 }
 316
 317 /**
 318  * check_lock_range() - vfs helper for smb byte range file locking
 319  * @filp:       the file to apply the lock to
 320  * @start:      lock start byte offset
 321  * @end:        lock end byte offset
 322  * @type:       byte range type read/write
 323  *
 324  * Return:      0 on success, otherwise error
 325  */
 326 static int check_lock_range(struct file *filp, loff_t start, loff_t end,
 327                             unsigned char type)
 328 {
 329         struct file_lock *flock;
 330         struct file_lock_context *ctx = file_inode(filp)->i_flctx;
 331         int error = 0;
 332
 333         if (!ctx || list_empty_careful(&ctx->flc_posix))
 334                 return 0;
 335
 336         spin_lock(&ctx->flc_lock);
 337         list_for_each_entry(flock, &ctx->flc_posix, fl_list) {
 338                 /* check conflict locks */
 339                 if (flock->fl_end >= start && end >= flock->fl_start) {
 340                         if (flock->fl_type == F_RDLCK) {
 341                                 if (type == WRITE) {
 342                                         pr_err("not allow write by shared lock\n");
 343                                         error = 1;
 344                                         goto out;
 345                                 }
 346                         } else if (flock->fl_type == F_WRLCK) {
 347                                 /* check owner in lock */
 348                                 if (flock->fl_file != filp) {
 349                                         error = 1;
 350                                         pr_err("not allow rw access by exclusive lock from other opens\n");
 351                                         goto out;
 352                                 }
 353                         }
 354                 }
 355         }
 356 out:
 357         spin_unlock(&ctx->flc_lock);
 358         return error;
 359 }
 360
 361 /**
 362  * ksmbd_vfs_read() - vfs helper for smb file read
 363  * @work:       smb work
 364  * @fid:        file id of open file
 365  * @count:      read byte count
 366  * @pos:        file pos
 367  * @rbuf:       read data buffer
 368  *
 369  * Return:      number of read bytes on success, otherwise error
 370  */
 371 int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count,
 372                    loff_t *pos, char *rbuf)
 373 {
 374         struct file *filp = fp->filp;
 375         ssize_t nbytes = 0;
 376         struct inode *inode = file_inode(filp);
 377
 378         if (S_ISDIR(inode->i_mode))
 379                 return -EISDIR;
 380
 381         if (unlikely(count == 0))
 382                 return 0;
 383
 384         if (work->conn->connection_type) {
 385                 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
 386                         pr_err("no right to read(%pD)\n", fp->filp);
 387                         return -EACCES;
 388                 }
 389         }
 390
 391         if (ksmbd_stream_fd(fp))
 392                 return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
 393
 394         if (!work->tcon->posix_extensions) {
 395                 int ret;
 396
 397                 ret = check_lock_range(filp, *pos, *pos + count - 1, READ);
 398                 if (ret) {
 399                         pr_err("unable to read due to lock\n");
 400                         return -EAGAIN;
 401                 }
 402         }
 403
 404         nbytes = kernel_read(filp, rbuf, count, pos);
 405         if (nbytes < 0) {
 406                 pr_err("smb read failed, err = %zd\n", nbytes);
 407                 return nbytes;
 408         }
 409
 410         filp->f_pos = *pos;
 411         return nbytes;
 412 }
 413
 414 static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
 415                                   size_t count)
 416 {
 417         char *stream_buf = NULL, *wbuf;
 418         struct user_namespace *user_ns = file_mnt_user_ns(fp->filp);
 419         size_t size;
 420         ssize_t v_len;
 421         int err = 0;
 422
 423         ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
 424                     *pos, count);
 425
 426         size = *pos + count;
 427         if (size > XATTR_SIZE_MAX) {
 428                 size = XATTR_SIZE_MAX;
 429                 count = (*pos + count) - XATTR_SIZE_MAX;
 430         }
 431
 432         v_len = ksmbd_vfs_getcasexattr(user_ns,
 433                                        fp->filp->f_path.dentry,
 434                                        fp->stream.name,
 435                                        fp->stream.size,
 436                                        &stream_buf);
 437         if (v_len < 0) {
 438                 pr_err("not found stream in xattr : %zd\n", v_len);
 439                 err = v_len;
 440                 goto out;
 441         }
 442
 443         if (v_len < size) {
 444                 wbuf = kvzalloc(size, GFP_KERNEL);
 445                 if (!wbuf) {
 446                         err = -ENOMEM;
 447                         goto out;
 448                 }
 449
 450                 if (v_len > 0)
 451                         memcpy(wbuf, stream_buf, v_len);
 452                 kvfree(stream_buf);
 453                 stream_buf = wbuf;
 454         }
 455
 456         memcpy(&stream_buf[*pos], buf, count);
 457
 458         err = ksmbd_vfs_setxattr(user_ns,
 459                                  &fp->filp->f_path,
 460                                  fp->stream.name,
 461                                  (void *)stream_buf,
 462                                  size,
 463                                  0,
 464                                  true);
 465         if (err < 0)
 466                 goto out;
 467
 468         fp->filp->f_pos = *pos;
 469         err = 0;
 470 out:
 471         kvfree(stream_buf);
 472         return err;
 473 }
 474
 475 /**
 476  * ksmbd_vfs_write() - vfs helper for smb file write
 477  * @work:       work
 478  * @fid:        file id of open file
 479  * @buf:        buf containing data for writing
 480  * @count:      read byte count
 481  * @pos:        file pos
 482  * @sync:       fsync after write
 483  * @written:    number of bytes written
 484  *
 485  * Return:      0 on success, otherwise error
 486  */
 487 int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
 488                     char *buf, size_t count, loff_t *pos, bool sync,
 489                     ssize_t *written)
 490 {
 491         struct file *filp;
 492         loff_t  offset = *pos;
 493         int err = 0;
 494
 495         if (work->conn->connection_type) {
 496                 if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
 497                         pr_err("no right to write(%pD)\n", fp->filp);
 498                         err = -EACCES;
 499                         goto out;
 500                 }
 501         }
 502
 503         filp = fp->filp;
 504
 505         if (ksmbd_stream_fd(fp)) {
 506                 err = ksmbd_vfs_stream_write(fp, buf, pos, count);
 507                 if (!err)
 508                         *written = count;
 509                 goto out;
 510         }
 511
 512         if (!work->tcon->posix_extensions) {
 513                 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
 514                 if (err) {
 515                         pr_err("unable to write due to lock\n");
 516                         err = -EAGAIN;
 517                         goto out;
 518                 }
 519         }
 520
 521         /* Reserve lease break for parent dir at closing time */
 522         fp->reserve_lease_break = true;
 523
 524         /* Do we need to break any of a levelII oplock? */
 525         smb_break_all_levII_oplock(work, fp, 1);
 526
 527         err = kernel_write(filp, buf, count, pos);
 528         if (err < 0) {
 529                 ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
 530                 goto out;
 531         }
 532
 533         filp->f_pos = *pos;
 534         *written = err;
 535         err = 0;
 536         if (sync) {
 537                 err = vfs_fsync_range(filp, offset, offset + *written, 0);
 538                 if (err < 0)
 539                         pr_err("fsync failed for filename = %pD, err = %d\n",
 540                                fp->filp, err);
 541         }
 542
 543 out:
 544         return err;
 545 }
 546
 547 /**
 548  * ksmbd_vfs_getattr() - vfs helper for smb getattr
 549  * @work:       work
 550  * @fid:        file id of open file
 551  * @attrs:      inode attributes
 552  *
 553  * Return:      0 on success, otherwise error
 554  */
 555 int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
 556 {
 557         int err;
 558
 559         err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
 560         if (err)
 561                 pr_err("getattr failed, err %d\n", err);
 562         return err;
 563 }
 564
 565 /**
 566  * ksmbd_vfs_fsync() - vfs helper for smb fsync
 567  * @work:       work
 568  * @fid:        file id of open file
 569  *
 570  * Return:      0 on success, otherwise error
 571  */
 572 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
 573 {
 574         struct ksmbd_file *fp;
 575         int err;
 576
 577         fp = ksmbd_lookup_fd_slow(work, fid, p_id);
 578         if (!fp) {
 579                 pr_err("failed to get filp for fid %llu\n", fid);
 580                 return -ENOENT;
 581         }
 582         err = vfs_fsync(fp->filp, 0);
 583         if (err < 0)
 584                 pr_err("smb fsync failed, err = %d\n", err);
 585         ksmbd_fd_put(work, fp);
 586         return err;
 587 }
 588
 589 /**
 590  * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
 591  * @name:       directory or file name that is relative to share
 592  *
 593  * Return:      0 on success, otherwise error
 594  */
 595 int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)
 596 {
 597         struct user_namespace *user_ns;
 598         struct dentry *parent = path->dentry->d_parent;
 599         int err;
 600
 601         if (ksmbd_override_fsids(work))
 602                 return -ENOMEM;
 603
 604         if (!d_inode(path->dentry)->i_nlink) {
 605                 err = -ENOENT;
 606                 goto out_err;
 607         }
 608
 609         user_ns = mnt_user_ns(path->mnt);
 610         if (S_ISDIR(d_inode(path->dentry)->i_mode)) {
 611                 err = vfs_rmdir(user_ns, d_inode(parent), path->dentry);
 612                 if (err && err != -ENOTEMPTY)
 613                         ksmbd_debug(VFS, "rmdir failed, err %d\n", err);
 614         } else {
 615                 err = vfs_unlink(user_ns, d_inode(parent), path->dentry, NULL);
 616                 if (err)
 617                         ksmbd_debug(VFS, "unlink failed, err %d\n", err);
 618         }
 619
 620 out_err:
 621         ksmbd_revert_fsids(work);
 622         return err;
 623 }
 624
 625 /**
 626  * ksmbd_vfs_link() - vfs helper for creating smb hardlink
 627  * @oldname:    source file name
 628  * @newname:    hardlink name that is relative to share
 629  *
 630  * Return:      0 on success, otherwise error
 631  */
 632 int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
 633                    const char *newname)
 634 {
 635         struct path oldpath, newpath;
 636         struct dentry *dentry;
 637         int err;
 638
 639         if (ksmbd_override_fsids(work))
 640                 return -ENOMEM;
 641
 642         err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
 643         if (err) {
 644                 pr_err("cannot get linux path for %s, err = %d\n",
 645                        oldname, err);
 646                 goto out1;
 647         }
 648
 649         dentry = ksmbd_vfs_kern_path_create(work, newname,
 650                                             LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
 651                                             &newpath);
 652         if (IS_ERR(dentry)) {
 653                 err = PTR_ERR(dentry);
 654                 pr_err("path create err for %s, err %d\n", newname, err);
 655                 goto out2;
 656         }
 657
 658         err = -EXDEV;
 659         if (oldpath.mnt != newpath.mnt) {
 660                 pr_err("vfs_link failed err %d\n", err);
 661                 goto out3;
 662         }
 663
 664         err = vfs_link(oldpath.dentry, mnt_user_ns(newpath.mnt),
 665                        d_inode(newpath.dentry),
 666                        dentry, NULL);
 667         if (err)
 668                 ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
 669
 670 out3:
 671         done_path_create(&newpath, dentry);
 672 out2:
 673         path_put(&oldpath);
 674 out1:
 675         ksmbd_revert_fsids(work);
 676         return err;
 677 }
 678
 679 int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
 680                      char *newname, int flags)
 681 {
 682         struct dentry *old_parent, *new_dentry, *trap;
 683         struct dentry *old_child = old_path->dentry;
 684         struct path new_path;
 685         struct qstr new_last;
 686         struct renamedata rd;
 687         struct filename *to;
 688         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
 689         struct ksmbd_file *parent_fp;
 690         int new_type;
 691         int err, lookup_flags = LOOKUP_NO_SYMLINKS;
 692
 693         if (ksmbd_override_fsids(work))
 694                 return -ENOMEM;
 695
 696         to = getname_kernel(newname);
 697         if (IS_ERR(to)) {
 698                 err = PTR_ERR(to);
 699                 goto revert_fsids;
 700         }
 701
 702 retry:
 703         err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH,
 704                                      &new_path, &new_last, &new_type,
 705                                      &share_conf->vfs_path);
 706         if (err)
 707                 goto out1;
 708
 709         if (old_path->mnt != new_path.mnt) {
 710                 err = -EXDEV;
 711                 goto out2;
 712         }
 713
 714         err = mnt_want_write(old_path->mnt);
 715         if (err)
 716                 goto out2;
 717
 718         trap = lock_rename_child(old_child, new_path.dentry);
 719
 720         old_parent = dget(old_child->d_parent);
 721         if (d_unhashed(old_child)) {
 722                 err = -EINVAL;
 723                 goto out3;
 724         }
 725
 726         parent_fp = ksmbd_lookup_fd_inode(old_child->d_parent);
 727         if (parent_fp) {
 728                 if (parent_fp->daccess & FILE_DELETE_LE) {
 729                         pr_err("parent dir is opened with delete access\n");
 730                         err = -ESHARE;
 731                         ksmbd_fd_put(work, parent_fp);
 732                         goto out3;
 733                 }
 734                 ksmbd_fd_put(work, parent_fp);
 735         }
 736
 737         new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry,
 738                                           lookup_flags | LOOKUP_RENAME_TARGET);
 739         if (IS_ERR(new_dentry)) {
 740                 err = PTR_ERR(new_dentry);
 741                 goto out3;
 742         }
 743
 744         if (d_is_symlink(new_dentry)) {
 745                 err = -EACCES;
 746                 goto out4;
 747         }
 748
 749         if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) {
 750                 err = -EEXIST;
 751                 goto out4;
 752         }
 753
 754         if (old_child == trap) {
 755                 err = -EINVAL;
 756                 goto out4;
 757         }
 758
 759         if (new_dentry == trap) {
 760                 err = -ENOTEMPTY;
 761                 goto out4;
 762         }
 763
 764         rd.old_mnt_userns       = mnt_user_ns(old_path->mnt),
 765         rd.old_dir              = d_inode(old_parent),
 766         rd.old_dentry           = old_child,
 767         rd.new_mnt_userns       = mnt_user_ns(new_path.mnt),
 768         rd.new_dir              = new_path.dentry->d_inode,
 769         rd.new_dentry           = new_dentry,
 770         rd.flags                = flags,
 771         rd.delegated_inode      = NULL,
 772         err = vfs_rename(&rd);
 773         if (err)
 774                 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);
 775
 776 out4:
 777         dput(new_dentry);
 778 out3:
 779         dput(old_parent);
 780         unlock_rename(old_parent, new_path.dentry);
 781         mnt_drop_write(old_path->mnt);
 782 out2:
 783         path_put(&new_path);
 784
 785         if (retry_estale(err, lookup_flags)) {
 786                 lookup_flags |= LOOKUP_REVAL;
 787                 goto retry;
 788         }
 789 out1:
 790         putname(to);
 791 revert_fsids:
 792         ksmbd_revert_fsids(work);
 793         return err;
 794 }
 795
 796 /**
 797  * ksmbd_vfs_truncate() - vfs helper for smb file truncate
 798  * @work:       work
 799  * @fid:        file id of old file
 800  * @size:       truncate to given size
 801  *
 802  * Return:      0 on success, otherwise error
 803  */
 804 int ksmbd_vfs_truncate(struct ksmbd_work *work,
 805                        struct ksmbd_file *fp, loff_t size)
 806 {
 807         int err = 0;
 808         struct file *filp;
 809
 810         filp = fp->filp;
 811
 812         /* Do we need to break any of a levelII oplock? */
 813         smb_break_all_levII_oplock(work, fp, 1);
 814
 815         if (!work->tcon->posix_extensions) {
 816                 struct inode *inode = file_inode(filp);
 817
 818                 if (size < inode->i_size) {
 819                         err = check_lock_range(filp, size,
 820                                                inode->i_size - 1, WRITE);
 821                 } else {
 822                         err = check_lock_range(filp, inode->i_size,
 823                                                size - 1, WRITE);
 824                 }
 825
 826                 if (err) {
 827                         pr_err("failed due to lock\n");
 828                         return -EAGAIN;
 829                 }
 830         }
 831
 832         err = vfs_truncate(&filp->f_path, size);
 833         if (err)
 834                 pr_err("truncate failed, err %d\n", err);
 835         return err;
 836 }
 837
 838 /**
 839  * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
 840  * @dentry:     dentry of file for listing xattrs
 841  * @list:       destination buffer
 842  * @size:       destination buffer length
 843  *
 844  * Return:      xattr list length on success, otherwise error
 845  */
 846 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
 847 {
 848         ssize_t size;
 849         char *vlist = NULL;
 850
 851         size = vfs_listxattr(dentry, NULL, 0);
 852         if (size <= 0)
 853                 return size;
 854
 855         vlist = kvzalloc(size, GFP_KERNEL);
 856         if (!vlist)
 857                 return -ENOMEM;
 858
 859         *list = vlist;
 860         size = vfs_listxattr(dentry, vlist, size);
 861         if (size < 0) {
 862                 ksmbd_debug(VFS, "listxattr failed\n");
 863                 kvfree(vlist);
 864                 *list = NULL;
 865         }
 866
 867         return size;
 868 }
 869
 870 static ssize_t ksmbd_vfs_xattr_len(struct user_namespace *user_ns,
 871                                    struct dentry *dentry, char *xattr_name)
 872 {
 873         return vfs_getxattr(user_ns, dentry, xattr_name, NULL, 0);
 874 }
 875
 876 /**
 877  * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
 878  * @user_ns:    user namespace
 879  * @dentry:     dentry of file for getting xattrs
 880  * @xattr_name: name of xattr name to query
 881  * @xattr_buf:  destination buffer xattr value
 882  *
 883  * Return:      read xattr value length on success, otherwise error
 884  */
 885 ssize_t ksmbd_vfs_getxattr(struct user_namespace *user_ns,
 886                            struct dentry *dentry,
 887                            char *xattr_name, char **xattr_buf)
 888 {
 889         ssize_t xattr_len;
 890         char *buf;
 891
 892         *xattr_buf = NULL;
 893         xattr_len = ksmbd_vfs_xattr_len(user_ns, dentry, xattr_name);
 894         if (xattr_len < 0)
 895                 return xattr_len;
 896
 897         buf = kmalloc(xattr_len + 1, GFP_KERNEL);
 898         if (!buf)
 899                 return -ENOMEM;
 900
 901         xattr_len = vfs_getxattr(user_ns, dentry, xattr_name,
 902                                  (void *)buf, xattr_len);
 903         if (xattr_len > 0)
 904                 *xattr_buf = buf;
 905         else
 906                 kfree(buf);
 907         return xattr_len;
 908 }
 909
 910 /**
 911  * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
 912  * @user_ns:    user namespace
 913  * @path:       path of dentry to set XATTR at
 914  * @attr_name:  xattr name for setxattr
 915  * @attr_value: xattr value to set
 916  * @attr_size:  size of xattr value
 917  * @flags:      destination buffer length
 918  * @get_write:  get write access to a mount
 919  *
 920  * Return:      0 on success, otherwise error
 921  */
 922 int ksmbd_vfs_setxattr(struct user_namespace *user_ns,
 923                        const struct path *path, const char *attr_name,
 924                        void *attr_value, size_t attr_size, int flags,
 925                        bool get_write)
 926 {
 927         int err;
 928
 929         if (get_write == true) {
 930                 err = mnt_want_write(path->mnt);
 931                 if (err)
 932                         return err;
 933         }
 934
 935         err = vfs_setxattr(user_ns,
 936                            path->dentry,
 937                            attr_name,
 938                            attr_value,
 939                            attr_size,
 940                            flags);
 941         if (err)
 942                 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
 943         if (get_write == true)
 944                 mnt_drop_write(path->mnt);
 945         return err;
 946 }
 947
 948 /**
 949  * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
 950  * @filp:       file pointer for IO
 951  * @options:    smb IO options
 952  */
 953 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
 954 {
 955         struct address_space *mapping;
 956
 957         mapping = filp->f_mapping;
 958
 959         if (!option || !mapping)
 960                 return;
 961
 962         if (option & FILE_WRITE_THROUGH_LE) {
 963                 filp->f_flags |= O_SYNC;
 964         } else if (option & FILE_SEQUENTIAL_ONLY_LE) {
 965                 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
 966                 spin_lock(&filp->f_lock);
 967                 filp->f_mode &= ~FMODE_RANDOM;
 968                 spin_unlock(&filp->f_lock);
 969         } else if (option & FILE_RANDOM_ACCESS_LE) {
 970                 spin_lock(&filp->f_lock);
 971                 filp->f_mode |= FMODE_RANDOM;
 972                 spin_unlock(&filp->f_lock);
 973         }
 974 }
 975
 976 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
 977                         loff_t off, loff_t len)
 978 {
 979         smb_break_all_levII_oplock(work, fp, 1);
 980         if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
 981                 return vfs_fallocate(fp->filp,
 982                                      FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
 983                                      off, len);
 984
 985         return vfs_fallocate(fp->filp,
 986                              FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
 987                              off, len);
 988 }
 989
 990 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
 991                          struct file_allocated_range_buffer *ranges,
 992                          unsigned int in_count, unsigned int *out_count)
 993 {
 994         struct file *f = fp->filp;
 995         struct inode *inode = file_inode(fp->filp);
 996         loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
 997         loff_t extent_start, extent_end;
 998         int ret = 0;
 999
1000         if (start > maxbytes)
1001                 return -EFBIG;
1002
1003         if (!in_count)
1004                 return 0;
1005
1006         /*
1007          * Shrink request scope to what the fs can actually handle.
1008          */
1009         if (length > maxbytes || (maxbytes - length) < start)
1010                 length = maxbytes - start;
1011
1012         if (start + length > inode->i_size)
1013                 length = inode->i_size - start;
1014
1015         *out_count = 0;
1016         end = start + length;
1017         while (start < end && *out_count < in_count) {
1018                 extent_start = vfs_llseek(f, start, SEEK_DATA);
1019                 if (extent_start < 0) {
1020                         if (extent_start != -ENXIO)
1021                                 ret = (int)extent_start;
1022                         break;
1023                 }
1024
1025                 if (extent_start >= end)
1026                         break;
1027
1028                 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
1029                 if (extent_end < 0) {
1030                         if (extent_end != -ENXIO)
1031                                 ret = (int)extent_end;
1032                         break;
1033                 } else if (extent_start >= extent_end) {
1034                         break;
1035                 }
1036
1037                 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1038                 ranges[(*out_count)++].length =
1039                         cpu_to_le64(min(extent_end, end) - extent_start);
1040
1041                 start = extent_end;
1042         }
1043
1044         return ret;
1045 }
1046
1047 int ksmbd_vfs_remove_xattr(struct user_namespace *user_ns,
1048                            const struct path *path, char *attr_name)
1049 {
1050         int err;
1051
1052         err = mnt_want_write(path->mnt);
1053         if (err)
1054                 return err;
1055
1056         err = vfs_removexattr(user_ns, path->dentry, attr_name);
1057         mnt_drop_write(path->mnt);
1058
1059         return err;
1060 }
1061
1062 int ksmbd_vfs_unlink(struct file *filp)
1063 {
1064         int err = 0;
1065         struct dentry *dir, *dentry = filp->f_path.dentry;
1066         struct user_namespace *user_ns = file_mnt_user_ns(filp);
1067
1068         err = mnt_want_write(filp->f_path.mnt);
1069         if (err)
1070                 return err;
1071
1072         dir = dget_parent(dentry);
1073         err = ksmbd_vfs_lock_parent(dir, dentry);
1074         if (err)
1075                 goto out;
1076         dget(dentry);
1077
1078         if (S_ISDIR(d_inode(dentry)->i_mode))
1079                 err = vfs_rmdir(user_ns, d_inode(dir), dentry);
1080         else
1081                 err = vfs_unlink(user_ns, d_inode(dir), dentry, NULL);
1082
1083         dput(dentry);
1084         inode_unlock(d_inode(dir));
1085         if (err)
1086                 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1087 out:
1088         dput(dir);
1089         mnt_drop_write(filp->f_path.mnt);
1090
1091         return err;
1092 }
1093
1094 static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1095                        loff_t offset, u64 ino, unsigned int d_type)
1096 {
1097         struct ksmbd_readdir_data *buf;
1098
1099         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1100         buf->dirent_count++;
1101
1102         return buf->dirent_count <= 2;
1103 }
1104
1105 /**
1106  * ksmbd_vfs_empty_dir() - check for empty directory
1107  * @fp: ksmbd file pointer
1108  *
1109  * Return:      true if directory empty, otherwise false
1110  */
1111 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1112 {
1113         int err;
1114         struct ksmbd_readdir_data readdir_data;
1115
1116         memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1117
1118         set_ctx_actor(&readdir_data.ctx, __dir_empty);
1119         readdir_data.dirent_count = 0;
1120
1121         err = iterate_dir(fp->filp, &readdir_data.ctx);
1122         if (readdir_data.dirent_count > 2)
1123                 err = -ENOTEMPTY;
1124         else
1125                 err = 0;
1126         return err;
1127 }
1128
1129 static bool __caseless_lookup(struct dir_context *ctx, const char *name,
1130                              int namlen, loff_t offset, u64 ino,
1131                              unsigned int d_type)
1132 {
1133         struct ksmbd_readdir_data *buf;
1134         int cmp = -EINVAL;
1135
1136         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1137
1138         if (buf->used != namlen)
1139                 return true;
1140         if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
1141                 const struct qstr q_buf = {.name = buf->private,
1142                                            .len = buf->used};
1143                 const struct qstr q_name = {.name = name,
1144                                             .len = namlen};
1145
1146                 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
1147         }
1148         if (cmp < 0)
1149                 cmp = strncasecmp((char *)buf->private, name, namlen);
1150         if (!cmp) {
1151                 memcpy((char *)buf->private, name, namlen);
1152                 buf->dirent_count = 1;
1153                 return false;
1154         }
1155         return true;
1156 }
1157
1158 /**
1159  * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1160  * @dir:        path info
1161  * @name:       filename to lookup
1162  * @namelen:    filename length
1163  *
1164  * Return:      0 on success, otherwise error
1165  */
1166 static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
1167                                    size_t namelen, struct unicode_map *um)
1168 {
1169         int ret;
1170         struct file *dfilp;
1171         int flags = O_RDONLY | O_LARGEFILE;
1172         struct ksmbd_readdir_data readdir_data = {
1173                 .ctx.actor      = __caseless_lookup,
1174                 .private        = name,
1175                 .used           = namelen,
1176                 .dirent_count   = 0,
1177                 .um             = um,
1178         };
1179
1180         dfilp = dentry_open(dir, flags, current_cred());
1181         if (IS_ERR(dfilp))
1182                 return PTR_ERR(dfilp);
1183
1184         ret = iterate_dir(dfilp, &readdir_data.ctx);
1185         if (readdir_data.dirent_count > 0)
1186                 ret = 0;
1187         fput(dfilp);
1188         return ret;
1189 }
1190
1191 /**
1192  * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
1193  * @name:               file path that is relative to share
1194  * @flags:              lookup flags
1195  * @parent_path:        if lookup succeed, return parent_path info
1196  * @path:               if lookup succeed, return path info
1197  * @caseless:   caseless filename lookup
1198  *
1199  * Return:      0 on success, otherwise error
1200  */
1201 int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
1202                                unsigned int flags, struct path *parent_path,
1203                                struct path *path, bool caseless)
1204 {
1205         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1206         int err;
1207
1208         err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path,
1209                                            path);
1210         if (!err)
1211                 return 0;
1212
1213         if (caseless) {
1214                 char *filepath;
1215                 size_t path_len, remain_len;
1216
1217                 filepath = kstrdup(name, GFP_KERNEL);
1218                 if (!filepath)
1219                         return -ENOMEM;
1220
1221                 path_len = strlen(filepath);
1222                 remain_len = path_len;
1223
1224                 *parent_path = share_conf->vfs_path;
1225                 path_get(parent_path);
1226
1227                 while (d_can_lookup(parent_path->dentry)) {
1228                         char *filename = filepath + path_len - remain_len;
1229                         char *next = strchrnul(filename, '/');
1230                         size_t filename_len = next - filename;
1231                         bool is_last = !next[0];
1232
1233                         if (filename_len == 0)
1234                                 break;
1235
1236                         err = ksmbd_vfs_lookup_in_dir(parent_path, filename,
1237                                                       filename_len,
1238                                                       work->conn->um);
1239                         if (err)
1240                                 goto out2;
1241
1242                         next[0] = '\0';
1243
1244                         err = vfs_path_lookup(share_conf->vfs_path.dentry,
1245                                               share_conf->vfs_path.mnt,
1246                                               filepath,
1247                                               flags,
1248                                               path);
1249                         if (err)
1250                                 goto out2;
1251                         else if (is_last)
1252                                 goto out1;
1253                         path_put(parent_path);
1254                         *parent_path = *path;
1255
1256                         next[0] = '/';
1257                         remain_len -= filename_len + 1;
1258                 }
1259
1260                 err = -EINVAL;
1261 out2:
1262                 path_put(parent_path);
1263 out1:
1264                 kfree(filepath);
1265         }
1266
1267         if (!err) {
1268                 err = mnt_want_write(parent_path->mnt);
1269                 if (err) {
1270                         path_put(path);
1271                         path_put(parent_path);
1272                         return err;
1273                 }
1274
1275                 err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry);
1276                 if (err) {
1277                         path_put(path);
1278                         path_put(parent_path);
1279                 }
1280         }
1281         return err;
1282 }
1283
1284 void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path)
1285 {
1286         inode_unlock(d_inode(parent_path->dentry));
1287         mnt_drop_write(parent_path->mnt);
1288         path_put(path);
1289         path_put(parent_path);
1290 }
1291
1292 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1293                                           const char *name,
1294                                           unsigned int flags,
1295                                           struct path *path)
1296 {
1297         char *abs_name;
1298         struct dentry *dent;
1299
1300         abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1301         if (!abs_name)
1302                 return ERR_PTR(-ENOMEM);
1303
1304         dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1305         kfree(abs_name);
1306         return dent;
1307 }
1308
1309 int ksmbd_vfs_remove_acl_xattrs(struct user_namespace *user_ns,
1310                                 const struct path *path)
1311 {
1312         char *name, *xattr_list = NULL;
1313         ssize_t xattr_list_len;
1314         int err = 0;
1315
1316         xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1317         if (xattr_list_len < 0) {
1318                 goto out;
1319         } else if (!xattr_list_len) {
1320                 ksmbd_debug(SMB, "empty xattr in the file\n");
1321                 goto out;
1322         }
1323
1324         for (name = xattr_list; name - xattr_list < xattr_list_len;
1325              name += strlen(name) + 1) {
1326                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1327
1328                 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1329                              sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1330                     !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1331                              sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1332                         err = ksmbd_vfs_remove_xattr(user_ns, path, name);
1333                         if (err)
1334                                 ksmbd_debug(SMB,
1335                                             "remove acl xattr failed : %s\n", name);
1336                 }
1337         }
1338
1339 out:
1340         kvfree(xattr_list);
1341         return err;
1342 }
1343
1344 int ksmbd_vfs_remove_sd_xattrs(struct user_namespace *user_ns, const struct path *path)
1345 {
1346         char *name, *xattr_list = NULL;
1347         ssize_t xattr_list_len;
1348         int err = 0;
1349
1350         xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1351         if (xattr_list_len < 0) {
1352                 goto out;
1353         } else if (!xattr_list_len) {
1354                 ksmbd_debug(SMB, "empty xattr in the file\n");
1355                 goto out;
1356         }
1357
1358         for (name = xattr_list; name - xattr_list < xattr_list_len;
1359                         name += strlen(name) + 1) {
1360                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1361
1362                 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1363                         err = ksmbd_vfs_remove_xattr(user_ns, path, name);
1364                         if (err)
1365                                 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1366                 }
1367         }
1368 out:
1369         kvfree(xattr_list);
1370         return err;
1371 }
1372
1373 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct user_namespace *user_ns,
1374                                                             struct inode *inode,
1375                                                             int acl_type)
1376 {
1377         struct xattr_smb_acl *smb_acl = NULL;
1378         struct posix_acl *posix_acls;
1379         struct posix_acl_entry *pa_entry;
1380         struct xattr_acl_entry *xa_entry;
1381         int i;
1382
1383         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1384                 return NULL;
1385
1386         posix_acls = get_acl(inode, acl_type);
1387         if (IS_ERR_OR_NULL(posix_acls))
1388                 return NULL;
1389
1390         smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1391                           sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1392                           GFP_KERNEL);
1393         if (!smb_acl)
1394                 goto out;
1395
1396         smb_acl->count = posix_acls->a_count;
1397         pa_entry = posix_acls->a_entries;
1398         xa_entry = smb_acl->entries;
1399         for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1400                 switch (pa_entry->e_tag) {
1401                 case ACL_USER:
1402                         xa_entry->type = SMB_ACL_USER;
1403                         xa_entry->uid = posix_acl_uid_translate(user_ns, pa_entry);
1404                         break;
1405                 case ACL_USER_OBJ:
1406                         xa_entry->type = SMB_ACL_USER_OBJ;
1407                         break;
1408                 case ACL_GROUP:
1409                         xa_entry->type = SMB_ACL_GROUP;
1410                         xa_entry->gid = posix_acl_gid_translate(user_ns, pa_entry);
1411                         break;
1412                 case ACL_GROUP_OBJ:
1413                         xa_entry->type = SMB_ACL_GROUP_OBJ;
1414                         break;
1415                 case ACL_OTHER:
1416                         xa_entry->type = SMB_ACL_OTHER;
1417                         break;
1418                 case ACL_MASK:
1419                         xa_entry->type = SMB_ACL_MASK;
1420                         break;
1421                 default:
1422                         pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1423                         goto out;
1424                 }
1425
1426                 if (pa_entry->e_perm & ACL_READ)
1427                         xa_entry->perm |= SMB_ACL_READ;
1428                 if (pa_entry->e_perm & ACL_WRITE)
1429                         xa_entry->perm |= SMB_ACL_WRITE;
1430                 if (pa_entry->e_perm & ACL_EXECUTE)
1431                         xa_entry->perm |= SMB_ACL_EXECUTE;
1432         }
1433 out:
1434         posix_acl_release(posix_acls);
1435         return smb_acl;
1436 }
1437
1438 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1439                            struct user_namespace *user_ns,
1440                            const struct path *path,
1441                            struct smb_ntsd *pntsd, int len,
1442                            bool get_write)
1443 {
1444         int rc;
1445         struct ndr sd_ndr = {0}, acl_ndr = {0};
1446         struct xattr_ntacl acl = {0};
1447         struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1448         struct dentry *dentry = path->dentry;
1449         struct inode *inode = d_inode(dentry);
1450
1451         acl.version = 4;
1452         acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1453         acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1454
1455         memcpy(acl.desc, "posix_acl", 9);
1456         acl.desc_len = 10;
1457
1458         pntsd->osidoffset =
1459                 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1460         pntsd->gsidoffset =
1461                 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1462         pntsd->dacloffset =
1463                 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1464
1465         acl.sd_buf = (char *)pntsd;
1466         acl.sd_size = len;
1467
1468         rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1469         if (rc) {
1470                 pr_err("failed to generate hash for ndr acl\n");
1471                 return rc;
1472         }
1473
1474         smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1475                                                  ACL_TYPE_ACCESS);
1476         if (S_ISDIR(inode->i_mode))
1477                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1478                                                              ACL_TYPE_DEFAULT);
1479
1480         rc = ndr_encode_posix_acl(&acl_ndr, user_ns, inode,
1481                                   smb_acl, def_smb_acl);
1482         if (rc) {
1483                 pr_err("failed to encode ndr to posix acl\n");
1484                 goto out;
1485         }
1486
1487         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1488                                acl.posix_acl_hash);
1489         if (rc) {
1490                 pr_err("failed to generate hash for ndr acl\n");
1491                 goto out;
1492         }
1493
1494         rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1495         if (rc) {
1496                 pr_err("failed to encode ndr to posix acl\n");
1497                 goto out;
1498         }
1499
1500         rc = ksmbd_vfs_setxattr(user_ns, path,
1501                                 XATTR_NAME_SD, sd_ndr.data,
1502                                 sd_ndr.offset, 0, get_write);
1503         if (rc < 0)
1504                 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1505
1506         kfree(sd_ndr.data);
1507 out:
1508         kfree(acl_ndr.data);
1509         kfree(smb_acl);
1510         kfree(def_smb_acl);
1511         return rc;
1512 }
1513
1514 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1515                            struct user_namespace *user_ns,
1516                            struct dentry *dentry,
1517                            struct smb_ntsd **pntsd)
1518 {
1519         int rc;
1520         struct ndr n;
1521         struct inode *inode = d_inode(dentry);
1522         struct ndr acl_ndr = {0};
1523         struct xattr_ntacl acl;
1524         struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1525         __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1526
1527         rc = ksmbd_vfs_getxattr(user_ns, dentry, XATTR_NAME_SD, &n.data);
1528         if (rc <= 0)
1529                 return rc;
1530
1531         n.length = rc;
1532         rc = ndr_decode_v4_ntacl(&n, &acl);
1533         if (rc)
1534                 goto free_n_data;
1535
1536         smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1537                                                  ACL_TYPE_ACCESS);
1538         if (S_ISDIR(inode->i_mode))
1539                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(user_ns, inode,
1540                                                              ACL_TYPE_DEFAULT);
1541
1542         rc = ndr_encode_posix_acl(&acl_ndr, user_ns, inode, smb_acl,
1543                                   def_smb_acl);
1544         if (rc) {
1545                 pr_err("failed to encode ndr to posix acl\n");
1546                 goto out_free;
1547         }
1548
1549         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1550         if (rc) {
1551                 pr_err("failed to generate hash for ndr acl\n");
1552                 goto out_free;
1553         }
1554
1555         if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1556                 pr_err("hash value diff\n");
1557                 rc = -EINVAL;
1558                 goto out_free;
1559         }
1560
1561         *pntsd = acl.sd_buf;
1562         if (acl.sd_size < sizeof(struct smb_ntsd)) {
1563                 pr_err("sd size is invalid\n");
1564                 goto out_free;
1565         }
1566
1567         (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1568                                            NDR_NTSD_OFFSETOF);
1569         (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1570                                            NDR_NTSD_OFFSETOF);
1571         (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1572                                            NDR_NTSD_OFFSETOF);
1573
1574         rc = acl.sd_size;
1575 out_free:
1576         kfree(acl_ndr.data);
1577         kfree(smb_acl);
1578         kfree(def_smb_acl);
1579         if (rc < 0) {
1580                 kfree(acl.sd_buf);
1581                 *pntsd = NULL;
1582         }
1583
1584 free_n_data:
1585         kfree(n.data);
1586         return rc;
1587 }
1588
1589 int ksmbd_vfs_set_dos_attrib_xattr(struct user_namespace *user_ns,
1590                                    const struct path *path,
1591                                    struct xattr_dos_attrib *da,
1592                                    bool get_write)
1593 {
1594         struct ndr n;
1595         int err;
1596
1597         err = ndr_encode_dos_attr(&n, da);
1598         if (err)
1599                 return err;
1600
1601         err = ksmbd_vfs_setxattr(user_ns, path, XATTR_NAME_DOS_ATTRIBUTE,
1602                                  (void *)n.data, n.offset, 0, get_write);
1603         if (err)
1604                 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1605         kfree(n.data);
1606
1607         return err;
1608 }
1609
1610 int ksmbd_vfs_get_dos_attrib_xattr(struct user_namespace *user_ns,
1611                                    struct dentry *dentry,
1612                                    struct xattr_dos_attrib *da)
1613 {
1614         struct ndr n;
1615         int err;
1616
1617         err = ksmbd_vfs_getxattr(user_ns, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1618                                  (char **)&n.data);
1619         if (err > 0) {
1620                 n.length = err;
1621                 if (ndr_decode_dos_attr(&n, da))
1622                         err = -EINVAL;
1623                 kfree(n.data);
1624         } else {
1625                 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1626         }
1627
1628         return err;
1629 }
1630
1631 /**
1632  * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1633  * @p:          destination buffer
1634  * @ksmbd_kstat:      ksmbd kstat wrapper
1635  */
1636 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1637 {
1638         struct file_directory_info *info = (struct file_directory_info *)(*p);
1639         struct kstat *kstat = ksmbd_kstat->kstat;
1640         u64 time;
1641
1642         info->FileIndex = 0;
1643         info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1644         time = ksmbd_UnixTimeToNT(kstat->atime);
1645         info->LastAccessTime = cpu_to_le64(time);
1646         time = ksmbd_UnixTimeToNT(kstat->mtime);
1647         info->LastWriteTime = cpu_to_le64(time);
1648         time = ksmbd_UnixTimeToNT(kstat->ctime);
1649         info->ChangeTime = cpu_to_le64(time);
1650
1651         if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1652                 info->EndOfFile = 0;
1653                 info->AllocationSize = 0;
1654         } else {
1655                 info->EndOfFile = cpu_to_le64(kstat->size);
1656                 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1657         }
1658         info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1659
1660         return info;
1661 }
1662
1663 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1664                                 struct user_namespace *user_ns,
1665                                 struct dentry *dentry,
1666                                 struct ksmbd_kstat *ksmbd_kstat)
1667 {
1668         u64 time;
1669         int rc;
1670
1671         generic_fillattr(user_ns, d_inode(dentry), ksmbd_kstat->kstat);
1672
1673         time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1674         ksmbd_kstat->create_time = time;
1675
1676         /*
1677          * set default value for the case that store dos attributes is not yes
1678          * or that acl is disable in server's filesystem and the config is yes.
1679          */
1680         if (S_ISDIR(ksmbd_kstat->kstat->mode))
1681                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1682         else
1683                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1684
1685         if (test_share_config_flag(work->tcon->share_conf,
1686                                    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1687                 struct xattr_dos_attrib da;
1688
1689                 rc = ksmbd_vfs_get_dos_attrib_xattr(user_ns, dentry, &da);
1690                 if (rc > 0) {
1691                         ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1692                         ksmbd_kstat->create_time = da.create_time;
1693                 } else {
1694                         ksmbd_debug(VFS, "fail to load dos attribute.\n");
1695                 }
1696         }
1697
1698         return 0;
1699 }
1700
1701 ssize_t ksmbd_vfs_casexattr_len(struct user_namespace *user_ns,
1702                                 struct dentry *dentry, char *attr_name,
1703                                 int attr_name_len)
1704 {
1705         char *name, *xattr_list = NULL;
1706         ssize_t value_len = -ENOENT, xattr_list_len;
1707
1708         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1709         if (xattr_list_len <= 0)
1710                 goto out;
1711
1712         for (name = xattr_list; name - xattr_list < xattr_list_len;
1713                         name += strlen(name) + 1) {
1714                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1715                 if (strncasecmp(attr_name, name, attr_name_len))
1716                         continue;
1717
1718                 value_len = ksmbd_vfs_xattr_len(user_ns, dentry, name);
1719                 break;
1720         }
1721
1722 out:
1723         kvfree(xattr_list);
1724         return value_len;
1725 }
1726
1727 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1728                                 size_t *xattr_stream_name_size, int s_type)
1729 {
1730         char *type, *buf;
1731
1732         if (s_type == DIR_STREAM)
1733                 type = ":$INDEX_ALLOCATION";
1734         else
1735                 type = ":$DATA";
1736
1737         buf = kasprintf(GFP_KERNEL, "%s%s%s",
1738                         XATTR_NAME_STREAM, stream_name, type);
1739         if (!buf)
1740                 return -ENOMEM;
1741
1742         *xattr_stream_name = buf;
1743         *xattr_stream_name_size = strlen(buf) + 1;
1744
1745         return 0;
1746 }
1747
1748 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1749                                struct ksmbd_file *src_fp,
1750                                struct ksmbd_file *dst_fp,
1751                                struct srv_copychunk *chunks,
1752                                unsigned int chunk_count,
1753                                unsigned int *chunk_count_written,
1754                                unsigned int *chunk_size_written,
1755                                loff_t *total_size_written)
1756 {
1757         unsigned int i;
1758         loff_t src_off, dst_off, src_file_size;
1759         size_t len;
1760         int ret;
1761
1762         *chunk_count_written = 0;
1763         *chunk_size_written = 0;
1764         *total_size_written = 0;
1765
1766         if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1767                 pr_err("no right to read(%pD)\n", src_fp->filp);
1768                 return -EACCES;
1769         }
1770         if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1771                 pr_err("no right to write(%pD)\n", dst_fp->filp);
1772                 return -EACCES;
1773         }
1774
1775         if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1776                 return -EBADF;
1777
1778         smb_break_all_levII_oplock(work, dst_fp, 1);
1779
1780         if (!work->tcon->posix_extensions) {
1781                 for (i = 0; i < chunk_count; i++) {
1782                         src_off = le64_to_cpu(chunks[i].SourceOffset);
1783                         dst_off = le64_to_cpu(chunks[i].TargetOffset);
1784                         len = le32_to_cpu(chunks[i].Length);
1785
1786                         if (check_lock_range(src_fp->filp, src_off,
1787                                              src_off + len - 1, READ))
1788                                 return -EAGAIN;
1789                         if (check_lock_range(dst_fp->filp, dst_off,
1790                                              dst_off + len - 1, WRITE))
1791                                 return -EAGAIN;
1792                 }
1793         }
1794
1795         src_file_size = i_size_read(file_inode(src_fp->filp));
1796
1797         for (i = 0; i < chunk_count; i++) {
1798                 src_off = le64_to_cpu(chunks[i].SourceOffset);
1799                 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1800                 len = le32_to_cpu(chunks[i].Length);
1801
1802                 if (src_off + len > src_file_size)
1803                         return -E2BIG;
1804
1805                 ret = vfs_copy_file_range(src_fp->filp, src_off,
1806                                           dst_fp->filp, dst_off, len, 0);
1807                 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1808                         ret = vfs_copy_file_range(src_fp->filp, src_off,
1809                                                   dst_fp->filp, dst_off, len,
1810                                                   COPY_FILE_SPLICE);
1811                 if (ret < 0)
1812                         return ret;
1813
1814                 *chunk_count_written += 1;
1815                 *total_size_written += ret;
1816         }
1817         return 0;
1818 }
1819
1820 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1821 {
1822         wait_event(flock->fl_wait, !flock->fl_blocker);
1823 }
1824
1825 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1826 {
1827         return wait_event_interruptible_timeout(flock->fl_wait,
1828                                                 !flock->fl_blocker,
1829                                                 timeout);
1830 }
1831
1832 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1833 {
1834         locks_delete_block(flock);
1835 }
1836
1837 int ksmbd_vfs_set_init_posix_acl(struct user_namespace *user_ns,
1838                                  struct path *path)
1839 {
1840         struct posix_acl_state acl_state;
1841         struct posix_acl *acls;
1842         struct inode *inode = d_inode(path->dentry);
1843         int rc;
1844
1845         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1846                 return -EOPNOTSUPP;
1847
1848         ksmbd_debug(SMB, "Set posix acls\n");
1849         rc = init_acl_state(&acl_state, 1);
1850         if (rc)
1851                 return rc;
1852
1853         /* Set default owner group */
1854         acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1855         acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1856         acl_state.other.allow = inode->i_mode & 0007;
1857         acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1858         acl_state.users->aces[acl_state.users->n++].perms.allow =
1859                 acl_state.owner.allow;
1860         acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1861         acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1862                 acl_state.group.allow;
1863         acl_state.mask.allow = 0x07;
1864
1865         acls = posix_acl_alloc(6, GFP_KERNEL);
1866         if (!acls) {
1867                 free_acl_state(&acl_state);
1868                 return -ENOMEM;
1869         }
1870         posix_state_to_acl(&acl_state, acls->a_entries);
1871
1872         rc = set_posix_acl(user_ns, inode, ACL_TYPE_ACCESS, acls);
1873         if (rc < 0)
1874                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1875                             rc);
1876         else if (S_ISDIR(inode->i_mode)) {
1877                 posix_state_to_acl(&acl_state, acls->a_entries);
1878                 rc = set_posix_acl(user_ns, inode, ACL_TYPE_DEFAULT,
1879                                    acls);
1880                 if (rc < 0)
1881                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1882                                     rc);
1883         }
1884
1885         free_acl_state(&acl_state);
1886         posix_acl_release(acls);
1887         return rc;
1888 }
1889
1890 int ksmbd_vfs_inherit_posix_acl(struct user_namespace *user_ns,
1891                                 struct path *path, struct inode *parent_inode)
1892 {
1893         struct posix_acl *acls;
1894         struct posix_acl_entry *pace;
1895         struct inode *inode = d_inode(path->dentry);
1896         int rc, i;
1897
1898         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1899                 return -EOPNOTSUPP;
1900
1901         acls = get_acl(parent_inode, ACL_TYPE_DEFAULT);
1902         if (IS_ERR_OR_NULL(acls))
1903                 return -ENOENT;
1904         pace = acls->a_entries;
1905
1906         for (i = 0; i < acls->a_count; i++, pace++) {
1907                 if (pace->e_tag == ACL_MASK) {
1908                         pace->e_perm = 0x07;
1909                         break;
1910                 }
1911         }
1912
1913         rc = set_posix_acl(user_ns, inode, ACL_TYPE_ACCESS, acls);
1914         if (rc < 0)
1915                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1916                             rc);
1917         if (S_ISDIR(inode->i_mode)) {
1918                 rc = set_posix_acl(user_ns, inode, ACL_TYPE_DEFAULT,
1919                                    acls);
1920                 if (rc < 0)
1921                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1922                                     rc);
1923         }
1924
1925         posix_acl_release(acls);
1926         return rc;
1927 }