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/filelock.h>
  10 #include <linux/uaccess.h>
  11 #include <linux/backing-dev.h>
  12 #include <linux/writeback.h>
  13 #include <linux/xattr.h>
  14 #include <linux/falloc.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 #include <linux/namei.h>
  22
  23 #include "glob.h"
  24 #include "oplock.h"
  25 #include "connection.h"
  26 #include "vfs.h"
  27 #include "vfs_cache.h"
  28 #include "smbacl.h"
  29 #include "ndr.h"
  30 #include "auth.h"
  31 #include "misc.h"
  32
  33 #include "smb_common.h"
  34 #include "mgmt/share_config.h"
  35 #include "mgmt/tree_connect.h"
  36 #include "mgmt/user_session.h"
  37 #include "mgmt/user_config.h"
  38
  39 static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work,
  40                                     struct inode *parent_inode,
  41                                     struct inode *inode)
  42 {
  43         if (!test_share_config_flag(work->tcon->share_conf,
  44                                     KSMBD_SHARE_FLAG_INHERIT_OWNER))
  45                 return;
  46
  47         i_uid_write(inode, i_uid_read(parent_inode));
  48 }
  49
  50 /**
  51  * ksmbd_vfs_lock_parent() - lock parent dentry if it is stable
  52  */
  53 int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child)
  54 {
  55         inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
  56         if (child->d_parent != parent) {
  57                 inode_unlock(d_inode(parent));
  58                 return -ENOENT;
  59         }
  60
  61         return 0;
  62 }
  63
  64 static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf,
  65                                         char *pathname, unsigned int flags,
  66                                         struct path *path)
  67 {
  68         struct qstr last;
  69         struct filename *filename;
  70         struct path *root_share_path = &share_conf->vfs_path;
  71         int err, type;
  72         struct path parent_path;
  73         struct dentry *d;
  74
  75         if (pathname[0] == '\0') {
  76                 pathname = share_conf->path;
  77                 root_share_path = NULL;
  78         } else {
  79                 flags |= LOOKUP_BENEATH;
  80         }
  81
  82         filename = getname_kernel(pathname);
  83         if (IS_ERR(filename))
  84                 return PTR_ERR(filename);
  85
  86         err = vfs_path_parent_lookup(filename, flags,
  87                                      &parent_path, &last, &type,
  88                                      root_share_path);
  89         if (err) {
  90                 putname(filename);
  91                 return err;
  92         }
  93
  94         if (unlikely(type != LAST_NORM)) {
  95                 path_put(&parent_path);
  96                 putname(filename);
  97                 return -ENOENT;
  98         }
  99
 100         inode_lock_nested(parent_path.dentry->d_inode, I_MUTEX_PARENT);
 101         d = lookup_one_qstr_excl(&last, parent_path.dentry, 0);
 102         if (IS_ERR(d))
 103                 goto err_out;
 104
 105         if (d_is_negative(d)) {
 106                 dput(d);
 107                 goto err_out;
 108         }
 109
 110         path->dentry = d;
 111         path->mnt = share_conf->vfs_path.mnt;
 112         path_put(&parent_path);
 113         putname(filename);
 114
 115         return 0;
 116
 117 err_out:
 118         inode_unlock(parent_path.dentry->d_inode);
 119         path_put(&parent_path);
 120         putname(filename);
 121         return -ENOENT;
 122 }
 123
 124 int ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap,
 125                                    struct dentry *dentry, __le32 *daccess)
 126 {
 127         int ret = 0;
 128
 129         *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
 130
 131         if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE))
 132                 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
 133                                 FILE_WRITE_DATA | FILE_APPEND_DATA |
 134                                 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
 135                                 FILE_DELETE_CHILD);
 136
 137         if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ))
 138                 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
 139
 140         if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC))
 141                 *daccess |= FILE_EXECUTE_LE;
 142
 143         if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE))
 144                 *daccess |= FILE_DELETE_LE;
 145
 146         return ret;
 147 }
 148
 149 /**
 150  * ksmbd_vfs_create() - vfs helper for smb create file
 151  * @work:       work
 152  * @name:       file name that is relative to share
 153  * @mode:       file create mode
 154  *
 155  * Return:      0 on success, otherwise error
 156  */
 157 int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
 158 {
 159         struct path path;
 160         struct dentry *dentry;
 161         int err;
 162
 163         dentry = ksmbd_vfs_kern_path_create(work, name,
 164                                             LOOKUP_NO_SYMLINKS, &path);
 165         if (IS_ERR(dentry)) {
 166                 err = PTR_ERR(dentry);
 167                 if (err != -ENOENT)
 168                         pr_err("path create failed for %s, err %d\n",
 169                                name, err);
 170                 return err;
 171         }
 172
 173         err = mnt_want_write(path.mnt);
 174         if (err)
 175                 goto out_err;
 176
 177         mode |= S_IFREG;
 178         err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry),
 179                          dentry, mode, true);
 180         if (!err) {
 181                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
 182                                         d_inode(dentry));
 183         } else {
 184                 pr_err("File(%s): creation failed (err:%d)\n", name, err);
 185         }
 186         mnt_drop_write(path.mnt);
 187
 188 out_err:
 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 mnt_idmap *idmap;
 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         err = mnt_want_write(path.mnt);
 220         if (err)
 221                 goto out_err2;
 222
 223         idmap = mnt_idmap(path.mnt);
 224         mode |= S_IFDIR;
 225         err = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode);
 226         if (!err && d_unhashed(dentry)) {
 227                 struct dentry *d;
 228
 229                 d = lookup_one(idmap, dentry->d_name.name, dentry->d_parent,
 230                                dentry->d_name.len);
 231                 if (IS_ERR(d)) {
 232                         err = PTR_ERR(d);
 233                         goto out_err1;
 234                 }
 235                 if (unlikely(d_is_negative(d))) {
 236                         dput(d);
 237                         err = -ENOENT;
 238                         goto out_err1;
 239                 }
 240
 241                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
 242                 dput(d);
 243         }
 244
 245 out_err1:
 246         mnt_drop_write(path.mnt);
 247 out_err2:
 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 mnt_idmap *idmap,
 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(idmap,
 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_idmap(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 = locks_inode_context(file_inode(filp));
 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  *
 368  * Return:      number of read bytes on success, otherwise error
 369  */
 370 int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count,
 371                    loff_t *pos)
 372 {
 373         struct file *filp = fp->filp;
 374         ssize_t nbytes = 0;
 375         char *rbuf = work->aux_payload_buf;
 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 mnt_idmap *idmap = file_mnt_idmap(fp->filp);
 419         size_t size, v_len;
 420         int err = 0;
 421
 422         ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
 423                     *pos, count);
 424
 425         size = *pos + count;
 426         if (size > XATTR_SIZE_MAX) {
 427                 size = XATTR_SIZE_MAX;
 428                 count = (*pos + count) - XATTR_SIZE_MAX;
 429         }
 430
 431         v_len = ksmbd_vfs_getcasexattr(idmap,
 432                                        fp->filp->f_path.dentry,
 433                                        fp->stream.name,
 434                                        fp->stream.size,
 435                                        &stream_buf);
 436         if ((int)v_len < 0) {
 437                 pr_err("not found stream in xattr : %zd\n", v_len);
 438                 err = (int)v_len;
 439                 goto out;
 440         }
 441
 442         if (v_len < size) {
 443                 wbuf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
 444                 if (!wbuf) {
 445                         err = -ENOMEM;
 446                         goto out;
 447                 }
 448
 449                 if (v_len > 0)
 450                         memcpy(wbuf, stream_buf, v_len);
 451                 kvfree(stream_buf);
 452                 stream_buf = wbuf;
 453         }
 454
 455         memcpy(&stream_buf[*pos], buf, count);
 456
 457         err = ksmbd_vfs_setxattr(idmap,
 458                                  &fp->filp->f_path,
 459                                  fp->stream.name,
 460                                  (void *)stream_buf,
 461                                  size,
 462                                  0);
 463         if (err < 0)
 464                 goto out;
 465
 466         fp->filp->f_pos = *pos;
 467         err = 0;
 468 out:
 469         kvfree(stream_buf);
 470         return err;
 471 }
 472
 473 /**
 474  * ksmbd_vfs_write() - vfs helper for smb file write
 475  * @work:       work
 476  * @fid:        file id of open file
 477  * @buf:        buf containing data for writing
 478  * @count:      read byte count
 479  * @pos:        file pos
 480  * @sync:       fsync after write
 481  * @written:    number of bytes written
 482  *
 483  * Return:      0 on success, otherwise error
 484  */
 485 int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
 486                     char *buf, size_t count, loff_t *pos, bool sync,
 487                     ssize_t *written)
 488 {
 489         struct file *filp;
 490         loff_t  offset = *pos;
 491         int err = 0;
 492
 493         if (work->conn->connection_type) {
 494                 if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
 495                         pr_err("no right to write(%pD)\n", fp->filp);
 496                         err = -EACCES;
 497                         goto out;
 498                 }
 499         }
 500
 501         filp = fp->filp;
 502
 503         if (ksmbd_stream_fd(fp)) {
 504                 err = ksmbd_vfs_stream_write(fp, buf, pos, count);
 505                 if (!err)
 506                         *written = count;
 507                 goto out;
 508         }
 509
 510         if (!work->tcon->posix_extensions) {
 511                 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
 512                 if (err) {
 513                         pr_err("unable to write due to lock\n");
 514                         err = -EAGAIN;
 515                         goto out;
 516                 }
 517         }
 518
 519         /* Do we need to break any of a levelII oplock? */
 520         smb_break_all_levII_oplock(work, fp, 1);
 521
 522         err = kernel_write(filp, buf, count, pos);
 523         if (err < 0) {
 524                 ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
 525                 goto out;
 526         }
 527
 528         filp->f_pos = *pos;
 529         *written = err;
 530         err = 0;
 531         if (sync) {
 532                 err = vfs_fsync_range(filp, offset, offset + *written, 0);
 533                 if (err < 0)
 534                         pr_err("fsync failed for filename = %pD, err = %d\n",
 535                                fp->filp, err);
 536         }
 537
 538 out:
 539         return err;
 540 }
 541
 542 /**
 543  * ksmbd_vfs_getattr() - vfs helper for smb getattr
 544  * @work:       work
 545  * @fid:        file id of open file
 546  * @attrs:      inode attributes
 547  *
 548  * Return:      0 on success, otherwise error
 549  */
 550 int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
 551 {
 552         int err;
 553
 554         err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
 555         if (err)
 556                 pr_err("getattr failed, err %d\n", err);
 557         return err;
 558 }
 559
 560 /**
 561  * ksmbd_vfs_fsync() - vfs helper for smb fsync
 562  * @work:       work
 563  * @fid:        file id of open file
 564  *
 565  * Return:      0 on success, otherwise error
 566  */
 567 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
 568 {
 569         struct ksmbd_file *fp;
 570         int err;
 571
 572         fp = ksmbd_lookup_fd_slow(work, fid, p_id);
 573         if (!fp) {
 574                 pr_err("failed to get filp for fid %llu\n", fid);
 575                 return -ENOENT;
 576         }
 577         err = vfs_fsync(fp->filp, 0);
 578         if (err < 0)
 579                 pr_err("smb fsync failed, err = %d\n", err);
 580         ksmbd_fd_put(work, fp);
 581         return err;
 582 }
 583
 584 /**
 585  * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
 586  * @name:       directory or file name that is relative to share
 587  *
 588  * Return:      0 on success, otherwise error
 589  */
 590 int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)
 591 {
 592         struct mnt_idmap *idmap;
 593         struct dentry *parent = path->dentry->d_parent;
 594         int err;
 595
 596         if (ksmbd_override_fsids(work))
 597                 return -ENOMEM;
 598
 599         if (!d_inode(path->dentry)->i_nlink) {
 600                 err = -ENOENT;
 601                 goto out_err;
 602         }
 603
 604         err = mnt_want_write(path->mnt);
 605         if (err)
 606                 goto out_err;
 607
 608         idmap = mnt_idmap(path->mnt);
 609         if (S_ISDIR(d_inode(path->dentry)->i_mode)) {
 610                 err = vfs_rmdir(idmap, d_inode(parent), path->dentry);
 611                 if (err && err != -ENOTEMPTY)
 612                         ksmbd_debug(VFS, "rmdir failed, err %d\n", err);
 613         } else {
 614                 err = vfs_unlink(idmap, d_inode(parent), path->dentry, NULL);
 615                 if (err)
 616                         ksmbd_debug(VFS, "unlink failed, err %d\n", err);
 617         }
 618         mnt_drop_write(path->mnt);
 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 = mnt_want_write(newpath.mnt);
 665         if (err)
 666                 goto out3;
 667
 668         err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt),
 669                        d_inode(newpath.dentry),
 670                        dentry, NULL);
 671         if (err)
 672                 ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
 673         mnt_drop_write(newpath.mnt);
 674
 675 out3:
 676         done_path_create(&newpath, dentry);
 677 out2:
 678         path_put(&oldpath);
 679 out1:
 680         ksmbd_revert_fsids(work);
 681         return err;
 682 }
 683
 684 int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
 685                      char *newname, int flags)
 686 {
 687         struct dentry *old_parent, *new_dentry, *trap;
 688         struct dentry *old_child = old_path->dentry;
 689         struct path new_path;
 690         struct qstr new_last;
 691         struct renamedata rd;
 692         struct filename *to;
 693         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
 694         struct ksmbd_file *parent_fp;
 695         int new_type;
 696         int err, lookup_flags = LOOKUP_NO_SYMLINKS;
 697
 698         if (ksmbd_override_fsids(work))
 699                 return -ENOMEM;
 700
 701         to = getname_kernel(newname);
 702         if (IS_ERR(to)) {
 703                 err = PTR_ERR(to);
 704                 goto revert_fsids;
 705         }
 706
 707 retry:
 708         err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH,
 709                                      &new_path, &new_last, &new_type,
 710                                      &share_conf->vfs_path);
 711         if (err)
 712                 goto out1;
 713
 714         if (old_path->mnt != new_path.mnt) {
 715                 err = -EXDEV;
 716                 goto out2;
 717         }
 718
 719         err = mnt_want_write(old_path->mnt);
 720         if (err)
 721                 goto out2;
 722
 723         trap = lock_rename_child(old_child, new_path.dentry);
 724
 725         old_parent = dget(old_child->d_parent);
 726         if (d_unhashed(old_child)) {
 727                 err = -EINVAL;
 728                 goto out3;
 729         }
 730
 731         parent_fp = ksmbd_lookup_fd_inode(d_inode(old_child->d_parent));
 732         if (parent_fp) {
 733                 if (parent_fp->daccess & FILE_DELETE_LE) {
 734                         pr_err("parent dir is opened with delete access\n");
 735                         err = -ESHARE;
 736                         ksmbd_fd_put(work, parent_fp);
 737                         goto out3;
 738                 }
 739                 ksmbd_fd_put(work, parent_fp);
 740         }
 741
 742         new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry,
 743                                           lookup_flags | LOOKUP_RENAME_TARGET);
 744         if (IS_ERR(new_dentry)) {
 745                 err = PTR_ERR(new_dentry);
 746                 goto out3;
 747         }
 748
 749         if (d_is_symlink(new_dentry)) {
 750                 err = -EACCES;
 751                 goto out4;
 752         }
 753
 754         if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) {
 755                 err = -EEXIST;
 756                 goto out4;
 757         }
 758
 759         if (old_child == trap) {
 760                 err = -EINVAL;
 761                 goto out4;
 762         }
 763
 764         if (new_dentry == trap) {
 765                 err = -ENOTEMPTY;
 766                 goto out4;
 767         }
 768
 769         rd.old_mnt_idmap        = mnt_idmap(old_path->mnt),
 770         rd.old_dir              = d_inode(old_parent),
 771         rd.old_dentry           = old_child,
 772         rd.new_mnt_idmap        = mnt_idmap(new_path.mnt),
 773         rd.new_dir              = new_path.dentry->d_inode,
 774         rd.new_dentry           = new_dentry,
 775         rd.flags                = flags,
 776         rd.delegated_inode      = NULL,
 777         err = vfs_rename(&rd);
 778         if (err)
 779                 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);
 780
 781 out4:
 782         dput(new_dentry);
 783 out3:
 784         dput(old_parent);
 785         unlock_rename(old_parent, new_path.dentry);
 786         mnt_drop_write(old_path->mnt);
 787 out2:
 788         path_put(&new_path);
 789
 790         if (retry_estale(err, lookup_flags)) {
 791                 lookup_flags |= LOOKUP_REVAL;
 792                 goto retry;
 793         }
 794 out1:
 795         putname(to);
 796 revert_fsids:
 797         ksmbd_revert_fsids(work);
 798         return err;
 799 }
 800
 801 /**
 802  * ksmbd_vfs_truncate() - vfs helper for smb file truncate
 803  * @work:       work
 804  * @fid:        file id of old file
 805  * @size:       truncate to given size
 806  *
 807  * Return:      0 on success, otherwise error
 808  */
 809 int ksmbd_vfs_truncate(struct ksmbd_work *work,
 810                        struct ksmbd_file *fp, loff_t size)
 811 {
 812         int err = 0;
 813         struct file *filp;
 814
 815         filp = fp->filp;
 816
 817         /* Do we need to break any of a levelII oplock? */
 818         smb_break_all_levII_oplock(work, fp, 1);
 819
 820         if (!work->tcon->posix_extensions) {
 821                 struct inode *inode = file_inode(filp);
 822
 823                 if (size < inode->i_size) {
 824                         err = check_lock_range(filp, size,
 825                                                inode->i_size - 1, WRITE);
 826                 } else {
 827                         err = check_lock_range(filp, inode->i_size,
 828                                                size - 1, WRITE);
 829                 }
 830
 831                 if (err) {
 832                         pr_err("failed due to lock\n");
 833                         return -EAGAIN;
 834                 }
 835         }
 836
 837         err = vfs_truncate(&filp->f_path, size);
 838         if (err)
 839                 pr_err("truncate failed, err %d\n", err);
 840         return err;
 841 }
 842
 843 /**
 844  * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
 845  * @dentry:     dentry of file for listing xattrs
 846  * @list:       destination buffer
 847  * @size:       destination buffer length
 848  *
 849  * Return:      xattr list length on success, otherwise error
 850  */
 851 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
 852 {
 853         ssize_t size;
 854         char *vlist = NULL;
 855
 856         size = vfs_listxattr(dentry, NULL, 0);
 857         if (size <= 0)
 858                 return size;
 859
 860         vlist = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
 861         if (!vlist)
 862                 return -ENOMEM;
 863
 864         *list = vlist;
 865         size = vfs_listxattr(dentry, vlist, size);
 866         if (size < 0) {
 867                 ksmbd_debug(VFS, "listxattr failed\n");
 868                 kvfree(vlist);
 869                 *list = NULL;
 870         }
 871
 872         return size;
 873 }
 874
 875 static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap,
 876                                    struct dentry *dentry, char *xattr_name)
 877 {
 878         return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0);
 879 }
 880
 881 /**
 882  * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
 883  * @idmap:      idmap
 884  * @dentry:     dentry of file for getting xattrs
 885  * @xattr_name: name of xattr name to query
 886  * @xattr_buf:  destination buffer xattr value
 887  *
 888  * Return:      read xattr value length on success, otherwise error
 889  */
 890 ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap,
 891                            struct dentry *dentry,
 892                            char *xattr_name, char **xattr_buf)
 893 {
 894         ssize_t xattr_len;
 895         char *buf;
 896
 897         *xattr_buf = NULL;
 898         xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name);
 899         if (xattr_len < 0)
 900                 return xattr_len;
 901
 902         buf = kmalloc(xattr_len + 1, GFP_KERNEL);
 903         if (!buf)
 904                 return -ENOMEM;
 905
 906         xattr_len = vfs_getxattr(idmap, dentry, xattr_name,
 907                                  (void *)buf, xattr_len);
 908         if (xattr_len > 0)
 909                 *xattr_buf = buf;
 910         else
 911                 kfree(buf);
 912         return xattr_len;
 913 }
 914
 915 /**
 916  * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
 917  * @idmap:      idmap of the relevant mount
 918  * @dentry:     dentry to set XATTR at
 919  * @attr_name:  xattr name for setxattr
 920  * @attr_value: xattr value to set
 921  * @attr_size:  size of xattr value
 922  * @flags:      destination buffer length
 923  *
 924  * Return:      0 on success, otherwise error
 925  */
 926 int ksmbd_vfs_setxattr(struct mnt_idmap *idmap,
 927                        const struct path *path, const char *attr_name,
 928                        void *attr_value, size_t attr_size, int flags)
 929 {
 930         int err;
 931
 932         err = mnt_want_write(path->mnt);
 933         if (err)
 934                 return err;
 935
 936         err = vfs_setxattr(idmap,
 937                            path->dentry,
 938                            attr_name,
 939                            attr_value,
 940                            attr_size,
 941                            flags);
 942         if (err)
 943                 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
 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 mnt_idmap *idmap,
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(idmap, 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 mnt_idmap *idmap = file_mnt_idmap(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(idmap, d_inode(dir), dentry);
1080         else
1081                 err = vfs_unlink(idmap, 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  * @path:       if lookup succeed, return path info
1196  * @caseless:   caseless filename lookup
1197  *
1198  * Return:      0 on success, otherwise error
1199  */
1200 int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
1201                                unsigned int flags, struct path *path,
1202                                bool caseless)
1203 {
1204         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1205         int err;
1206         struct path parent_path;
1207
1208         err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, path);
1209         if (!err)
1210                 return err;
1211
1212         if (caseless) {
1213                 char *filepath;
1214                 size_t path_len, remain_len;
1215
1216                 filepath = kstrdup(name, GFP_KERNEL);
1217                 if (!filepath)
1218                         return -ENOMEM;
1219
1220                 path_len = strlen(filepath);
1221                 remain_len = path_len;
1222
1223                 parent_path = share_conf->vfs_path;
1224                 path_get(&parent_path);
1225
1226                 while (d_can_lookup(parent_path.dentry)) {
1227                         char *filename = filepath + path_len - remain_len;
1228                         char *next = strchrnul(filename, '/');
1229                         size_t filename_len = next - filename;
1230                         bool is_last = !next[0];
1231
1232                         if (filename_len == 0)
1233                                 break;
1234
1235                         err = ksmbd_vfs_lookup_in_dir(&parent_path, filename,
1236                                                       filename_len,
1237                                                       work->conn->um);
1238                         if (err)
1239                                 goto out2;
1240
1241                         next[0] = '\0';
1242
1243                         err = vfs_path_lookup(share_conf->vfs_path.dentry,
1244                                               share_conf->vfs_path.mnt,
1245                                               filepath,
1246                                               flags,
1247                                               path);
1248                         if (err)
1249                                 goto out2;
1250                         else if (is_last)
1251                                 goto out1;
1252                         path_put(&parent_path);
1253                         parent_path = *path;
1254
1255                         next[0] = '/';
1256                         remain_len -= filename_len + 1;
1257                 }
1258
1259                 err = -EINVAL;
1260 out2:
1261                 path_put(&parent_path);
1262 out1:
1263                 kfree(filepath);
1264         }
1265
1266         if (!err) {
1267                 err = ksmbd_vfs_lock_parent(parent_path.dentry, path->dentry);
1268                 if (err)
1269                         dput(path->dentry);
1270                 path_put(&parent_path);
1271         }
1272         return err;
1273 }
1274
1275 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1276                                           const char *name,
1277                                           unsigned int flags,
1278                                           struct path *path)
1279 {
1280         char *abs_name;
1281         struct dentry *dent;
1282
1283         abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1284         if (!abs_name)
1285                 return ERR_PTR(-ENOMEM);
1286
1287         dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1288         kfree(abs_name);
1289         return dent;
1290 }
1291
1292 int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap,
1293                                 const struct path *path)
1294 {
1295         char *name, *xattr_list = NULL;
1296         ssize_t xattr_list_len;
1297         int err = 0;
1298
1299         xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1300         if (xattr_list_len < 0) {
1301                 goto out;
1302         } else if (!xattr_list_len) {
1303                 ksmbd_debug(SMB, "empty xattr in the file\n");
1304                 goto out;
1305         }
1306
1307         err = mnt_want_write(path->mnt);
1308         if (err)
1309                 goto out;
1310
1311         for (name = xattr_list; name - xattr_list < xattr_list_len;
1312              name += strlen(name) + 1) {
1313                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1314
1315                 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1316                              sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1317                     !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1318                              sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1319                         err = vfs_remove_acl(idmap, path->dentry, name);
1320                         if (err)
1321                                 ksmbd_debug(SMB,
1322                                             "remove acl xattr failed : %s\n", name);
1323                 }
1324         }
1325         mnt_drop_write(path->mnt);
1326
1327 out:
1328         kvfree(xattr_list);
1329         return err;
1330 }
1331
1332 int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path)
1333 {
1334         char *name, *xattr_list = NULL;
1335         ssize_t xattr_list_len;
1336         int err = 0;
1337
1338         xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1339         if (xattr_list_len < 0) {
1340                 goto out;
1341         } else if (!xattr_list_len) {
1342                 ksmbd_debug(SMB, "empty xattr in the file\n");
1343                 goto out;
1344         }
1345
1346         for (name = xattr_list; name - xattr_list < xattr_list_len;
1347                         name += strlen(name) + 1) {
1348                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1349
1350                 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1351                         err = ksmbd_vfs_remove_xattr(idmap, path, name);
1352                         if (err)
1353                                 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1354                 }
1355         }
1356 out:
1357         kvfree(xattr_list);
1358         return err;
1359 }
1360
1361 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap,
1362                                                             struct inode *inode,
1363                                                             int acl_type)
1364 {
1365         struct xattr_smb_acl *smb_acl = NULL;
1366         struct posix_acl *posix_acls;
1367         struct posix_acl_entry *pa_entry;
1368         struct xattr_acl_entry *xa_entry;
1369         int i;
1370
1371         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1372                 return NULL;
1373
1374         posix_acls = get_inode_acl(inode, acl_type);
1375         if (IS_ERR_OR_NULL(posix_acls))
1376                 return NULL;
1377
1378         smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1379                           sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1380                           GFP_KERNEL);
1381         if (!smb_acl)
1382                 goto out;
1383
1384         smb_acl->count = posix_acls->a_count;
1385         pa_entry = posix_acls->a_entries;
1386         xa_entry = smb_acl->entries;
1387         for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1388                 switch (pa_entry->e_tag) {
1389                 case ACL_USER:
1390                         xa_entry->type = SMB_ACL_USER;
1391                         xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry);
1392                         break;
1393                 case ACL_USER_OBJ:
1394                         xa_entry->type = SMB_ACL_USER_OBJ;
1395                         break;
1396                 case ACL_GROUP:
1397                         xa_entry->type = SMB_ACL_GROUP;
1398                         xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry);
1399                         break;
1400                 case ACL_GROUP_OBJ:
1401                         xa_entry->type = SMB_ACL_GROUP_OBJ;
1402                         break;
1403                 case ACL_OTHER:
1404                         xa_entry->type = SMB_ACL_OTHER;
1405                         break;
1406                 case ACL_MASK:
1407                         xa_entry->type = SMB_ACL_MASK;
1408                         break;
1409                 default:
1410                         pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1411                         goto out;
1412                 }
1413
1414                 if (pa_entry->e_perm & ACL_READ)
1415                         xa_entry->perm |= SMB_ACL_READ;
1416                 if (pa_entry->e_perm & ACL_WRITE)
1417                         xa_entry->perm |= SMB_ACL_WRITE;
1418                 if (pa_entry->e_perm & ACL_EXECUTE)
1419                         xa_entry->perm |= SMB_ACL_EXECUTE;
1420         }
1421 out:
1422         posix_acl_release(posix_acls);
1423         return smb_acl;
1424 }
1425
1426 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1427                            struct mnt_idmap *idmap,
1428                            const struct path *path,
1429                            struct smb_ntsd *pntsd, int len)
1430 {
1431         int rc;
1432         struct ndr sd_ndr = {0}, acl_ndr = {0};
1433         struct xattr_ntacl acl = {0};
1434         struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1435         struct dentry *dentry = path->dentry;
1436         struct inode *inode = d_inode(dentry);
1437
1438         acl.version = 4;
1439         acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1440         acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1441
1442         memcpy(acl.desc, "posix_acl", 9);
1443         acl.desc_len = 10;
1444
1445         pntsd->osidoffset =
1446                 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1447         pntsd->gsidoffset =
1448                 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1449         pntsd->dacloffset =
1450                 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1451
1452         acl.sd_buf = (char *)pntsd;
1453         acl.sd_size = len;
1454
1455         rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1456         if (rc) {
1457                 pr_err("failed to generate hash for ndr acl\n");
1458                 return rc;
1459         }
1460
1461         smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1462                                                  ACL_TYPE_ACCESS);
1463         if (S_ISDIR(inode->i_mode))
1464                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1465                                                              ACL_TYPE_DEFAULT);
1466
1467         rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode,
1468                                   smb_acl, def_smb_acl);
1469         if (rc) {
1470                 pr_err("failed to encode ndr to posix acl\n");
1471                 goto out;
1472         }
1473
1474         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1475                                acl.posix_acl_hash);
1476         if (rc) {
1477                 pr_err("failed to generate hash for ndr acl\n");
1478                 goto out;
1479         }
1480
1481         rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1482         if (rc) {
1483                 pr_err("failed to encode ndr to posix acl\n");
1484                 goto out;
1485         }
1486
1487         rc = ksmbd_vfs_setxattr(idmap, path,
1488                                 XATTR_NAME_SD, sd_ndr.data,
1489                                 sd_ndr.offset, 0);
1490         if (rc < 0)
1491                 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1492
1493         kfree(sd_ndr.data);
1494 out:
1495         kfree(acl_ndr.data);
1496         kfree(smb_acl);
1497         kfree(def_smb_acl);
1498         return rc;
1499 }
1500
1501 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1502                            struct mnt_idmap *idmap,
1503                            struct dentry *dentry,
1504                            struct smb_ntsd **pntsd)
1505 {
1506         int rc;
1507         struct ndr n;
1508         struct inode *inode = d_inode(dentry);
1509         struct ndr acl_ndr = {0};
1510         struct xattr_ntacl acl;
1511         struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1512         __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1513
1514         rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data);
1515         if (rc <= 0)
1516                 return rc;
1517
1518         n.length = rc;
1519         rc = ndr_decode_v4_ntacl(&n, &acl);
1520         if (rc)
1521                 goto free_n_data;
1522
1523         smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1524                                                  ACL_TYPE_ACCESS);
1525         if (S_ISDIR(inode->i_mode))
1526                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1527                                                              ACL_TYPE_DEFAULT);
1528
1529         rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl,
1530                                   def_smb_acl);
1531         if (rc) {
1532                 pr_err("failed to encode ndr to posix acl\n");
1533                 goto out_free;
1534         }
1535
1536         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1537         if (rc) {
1538                 pr_err("failed to generate hash for ndr acl\n");
1539                 goto out_free;
1540         }
1541
1542         if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1543                 pr_err("hash value diff\n");
1544                 rc = -EINVAL;
1545                 goto out_free;
1546         }
1547
1548         *pntsd = acl.sd_buf;
1549         if (acl.sd_size < sizeof(struct smb_ntsd)) {
1550                 pr_err("sd size is invalid\n");
1551                 goto out_free;
1552         }
1553
1554         (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1555                                            NDR_NTSD_OFFSETOF);
1556         (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1557                                            NDR_NTSD_OFFSETOF);
1558         (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1559                                            NDR_NTSD_OFFSETOF);
1560
1561         rc = acl.sd_size;
1562 out_free:
1563         kfree(acl_ndr.data);
1564         kfree(smb_acl);
1565         kfree(def_smb_acl);
1566         if (rc < 0) {
1567                 kfree(acl.sd_buf);
1568                 *pntsd = NULL;
1569         }
1570
1571 free_n_data:
1572         kfree(n.data);
1573         return rc;
1574 }
1575
1576 int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap,
1577                                    const struct path *path,
1578                                    struct xattr_dos_attrib *da)
1579 {
1580         struct ndr n;
1581         int err;
1582
1583         err = ndr_encode_dos_attr(&n, da);
1584         if (err)
1585                 return err;
1586
1587         err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE,
1588                                  (void *)n.data, n.offset, 0);
1589         if (err)
1590                 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1591         kfree(n.data);
1592
1593         return err;
1594 }
1595
1596 int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap,
1597                                    struct dentry *dentry,
1598                                    struct xattr_dos_attrib *da)
1599 {
1600         struct ndr n;
1601         int err;
1602
1603         err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1604                                  (char **)&n.data);
1605         if (err > 0) {
1606                 n.length = err;
1607                 if (ndr_decode_dos_attr(&n, da))
1608                         err = -EINVAL;
1609                 kfree(n.data);
1610         } else {
1611                 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1612         }
1613
1614         return err;
1615 }
1616
1617 /**
1618  * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1619  * @p:          destination buffer
1620  * @ksmbd_kstat:      ksmbd kstat wrapper
1621  */
1622 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1623 {
1624         struct file_directory_info *info = (struct file_directory_info *)(*p);
1625         struct kstat *kstat = ksmbd_kstat->kstat;
1626         u64 time;
1627
1628         info->FileIndex = 0;
1629         info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1630         time = ksmbd_UnixTimeToNT(kstat->atime);
1631         info->LastAccessTime = cpu_to_le64(time);
1632         time = ksmbd_UnixTimeToNT(kstat->mtime);
1633         info->LastWriteTime = cpu_to_le64(time);
1634         time = ksmbd_UnixTimeToNT(kstat->ctime);
1635         info->ChangeTime = cpu_to_le64(time);
1636
1637         if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1638                 info->EndOfFile = 0;
1639                 info->AllocationSize = 0;
1640         } else {
1641                 info->EndOfFile = cpu_to_le64(kstat->size);
1642                 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1643         }
1644         info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1645
1646         return info;
1647 }
1648
1649 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1650                                 struct mnt_idmap *idmap,
1651                                 struct dentry *dentry,
1652                                 struct ksmbd_kstat *ksmbd_kstat)
1653 {
1654         u64 time;
1655         int rc;
1656
1657         generic_fillattr(idmap, d_inode(dentry), ksmbd_kstat->kstat);
1658
1659         time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1660         ksmbd_kstat->create_time = time;
1661
1662         /*
1663          * set default value for the case that store dos attributes is not yes
1664          * or that acl is disable in server's filesystem and the config is yes.
1665          */
1666         if (S_ISDIR(ksmbd_kstat->kstat->mode))
1667                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1668         else
1669                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1670
1671         if (test_share_config_flag(work->tcon->share_conf,
1672                                    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1673                 struct xattr_dos_attrib da;
1674
1675                 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
1676                 if (rc > 0) {
1677                         ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1678                         ksmbd_kstat->create_time = da.create_time;
1679                 } else {
1680                         ksmbd_debug(VFS, "fail to load dos attribute.\n");
1681                 }
1682         }
1683
1684         return 0;
1685 }
1686
1687 ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap,
1688                                 struct dentry *dentry, char *attr_name,
1689                                 int attr_name_len)
1690 {
1691         char *name, *xattr_list = NULL;
1692         ssize_t value_len = -ENOENT, xattr_list_len;
1693
1694         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1695         if (xattr_list_len <= 0)
1696                 goto out;
1697
1698         for (name = xattr_list; name - xattr_list < xattr_list_len;
1699                         name += strlen(name) + 1) {
1700                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1701                 if (strncasecmp(attr_name, name, attr_name_len))
1702                         continue;
1703
1704                 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name);
1705                 break;
1706         }
1707
1708 out:
1709         kvfree(xattr_list);
1710         return value_len;
1711 }
1712
1713 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1714                                 size_t *xattr_stream_name_size, int s_type)
1715 {
1716         char *type, *buf;
1717
1718         if (s_type == DIR_STREAM)
1719                 type = ":$INDEX_ALLOCATION";
1720         else
1721                 type = ":$DATA";
1722
1723         buf = kasprintf(GFP_KERNEL, "%s%s%s",
1724                         XATTR_NAME_STREAM, stream_name, type);
1725         if (!buf)
1726                 return -ENOMEM;
1727
1728         *xattr_stream_name = buf;
1729         *xattr_stream_name_size = strlen(buf) + 1;
1730
1731         return 0;
1732 }
1733
1734 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1735                                struct ksmbd_file *src_fp,
1736                                struct ksmbd_file *dst_fp,
1737                                struct srv_copychunk *chunks,
1738                                unsigned int chunk_count,
1739                                unsigned int *chunk_count_written,
1740                                unsigned int *chunk_size_written,
1741                                loff_t *total_size_written)
1742 {
1743         unsigned int i;
1744         loff_t src_off, dst_off, src_file_size;
1745         size_t len;
1746         int ret;
1747
1748         *chunk_count_written = 0;
1749         *chunk_size_written = 0;
1750         *total_size_written = 0;
1751
1752         if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1753                 pr_err("no right to read(%pD)\n", src_fp->filp);
1754                 return -EACCES;
1755         }
1756         if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1757                 pr_err("no right to write(%pD)\n", dst_fp->filp);
1758                 return -EACCES;
1759         }
1760
1761         if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1762                 return -EBADF;
1763
1764         smb_break_all_levII_oplock(work, dst_fp, 1);
1765
1766         if (!work->tcon->posix_extensions) {
1767                 for (i = 0; i < chunk_count; i++) {
1768                         src_off = le64_to_cpu(chunks[i].SourceOffset);
1769                         dst_off = le64_to_cpu(chunks[i].TargetOffset);
1770                         len = le32_to_cpu(chunks[i].Length);
1771
1772                         if (check_lock_range(src_fp->filp, src_off,
1773                                              src_off + len - 1, READ))
1774                                 return -EAGAIN;
1775                         if (check_lock_range(dst_fp->filp, dst_off,
1776                                              dst_off + len - 1, WRITE))
1777                                 return -EAGAIN;
1778                 }
1779         }
1780
1781         src_file_size = i_size_read(file_inode(src_fp->filp));
1782
1783         for (i = 0; i < chunk_count; i++) {
1784                 src_off = le64_to_cpu(chunks[i].SourceOffset);
1785                 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1786                 len = le32_to_cpu(chunks[i].Length);
1787
1788                 if (src_off + len > src_file_size)
1789                         return -E2BIG;
1790
1791                 ret = vfs_copy_file_range(src_fp->filp, src_off,
1792                                           dst_fp->filp, dst_off, len, 0);
1793                 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1794                         ret = vfs_copy_file_range(src_fp->filp, src_off,
1795                                                   dst_fp->filp, dst_off, len,
1796                                                   COPY_FILE_SPLICE);
1797                 if (ret < 0)
1798                         return ret;
1799
1800                 *chunk_count_written += 1;
1801                 *total_size_written += ret;
1802         }
1803         return 0;
1804 }
1805
1806 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1807 {
1808         wait_event(flock->fl_wait, !flock->fl_blocker);
1809 }
1810
1811 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1812 {
1813         return wait_event_interruptible_timeout(flock->fl_wait,
1814                                                 !flock->fl_blocker,
1815                                                 timeout);
1816 }
1817
1818 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1819 {
1820         locks_delete_block(flock);
1821 }
1822
1823 int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
1824                                  struct path *path)
1825 {
1826         struct posix_acl_state acl_state;
1827         struct posix_acl *acls;
1828         struct dentry *dentry = path->dentry;
1829         struct inode *inode = d_inode(dentry);
1830         int rc;
1831
1832         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1833                 return -EOPNOTSUPP;
1834
1835         ksmbd_debug(SMB, "Set posix acls\n");
1836         rc = init_acl_state(&acl_state, 1);
1837         if (rc)
1838                 return rc;
1839
1840         /* Set default owner group */
1841         acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1842         acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1843         acl_state.other.allow = inode->i_mode & 0007;
1844         acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1845         acl_state.users->aces[acl_state.users->n++].perms.allow =
1846                 acl_state.owner.allow;
1847         acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1848         acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1849                 acl_state.group.allow;
1850         acl_state.mask.allow = 0x07;
1851
1852         acls = posix_acl_alloc(6, GFP_KERNEL);
1853         if (!acls) {
1854                 free_acl_state(&acl_state);
1855                 return -ENOMEM;
1856         }
1857         posix_state_to_acl(&acl_state, acls->a_entries);
1858
1859         rc = mnt_want_write(path->mnt);
1860         if (rc)
1861                 goto out_err;
1862
1863         rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1864         if (rc < 0)
1865                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1866                             rc);
1867         else if (S_ISDIR(inode->i_mode)) {
1868                 posix_state_to_acl(&acl_state, acls->a_entries);
1869                 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls);
1870                 if (rc < 0)
1871                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1872                                     rc);
1873         }
1874         mnt_drop_write(path->mnt);
1875
1876 out_err:
1877         free_acl_state(&acl_state);
1878         posix_acl_release(acls);
1879         return rc;
1880 }
1881
1882 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
1883                                 struct path *path, struct inode *parent_inode)
1884 {
1885         struct posix_acl *acls;
1886         struct posix_acl_entry *pace;
1887         struct dentry *dentry = path->dentry;
1888         struct inode *inode = d_inode(dentry);
1889         int rc, i;
1890
1891         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1892                 return -EOPNOTSUPP;
1893
1894         acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT);
1895         if (IS_ERR_OR_NULL(acls))
1896                 return -ENOENT;
1897         pace = acls->a_entries;
1898
1899         for (i = 0; i < acls->a_count; i++, pace++) {
1900                 if (pace->e_tag == ACL_MASK) {
1901                         pace->e_perm = 0x07;
1902                         break;
1903                 }
1904         }
1905
1906         rc = mnt_want_write(path->mnt);
1907         if (rc)
1908                 goto out_err;
1909
1910         rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1911         if (rc < 0)
1912                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1913                             rc);
1914         if (S_ISDIR(inode->i_mode)) {
1915                 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT,
1916                                    acls);
1917                 if (rc < 0)
1918                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1919                                     rc);
1920         }
1921         mnt_drop_write(path->mnt);
1922
1923 out_err:
1924         posix_acl_release(acls);
1925         return rc;
1926 }