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         mode |= S_IFREG;
 174         err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry),
 175                          dentry, mode, true);
 176         if (!err) {
 177                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
 178                                         d_inode(dentry));
 179         } else {
 180                 pr_err("File(%s): creation failed (err:%d)\n", name, err);
 181         }
 182         done_path_create(&path, dentry);
 183         return err;
 184 }
 185
 186 /**
 187  * ksmbd_vfs_mkdir() - vfs helper for smb create directory
 188  * @work:       work
 189  * @name:       directory name that is relative to share
 190  * @mode:       directory create mode
 191  *
 192  * Return:      0 on success, otherwise error
 193  */
 194 int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
 195 {
 196         struct mnt_idmap *idmap;
 197         struct path path;
 198         struct dentry *dentry;
 199         int err;
 200
 201         dentry = ksmbd_vfs_kern_path_create(work, name,
 202                                             LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
 203                                             &path);
 204         if (IS_ERR(dentry)) {
 205                 err = PTR_ERR(dentry);
 206                 if (err != -EEXIST)
 207                         ksmbd_debug(VFS, "path create failed for %s, err %d\n",
 208                                     name, err);
 209                 return err;
 210         }
 211
 212         idmap = mnt_idmap(path.mnt);
 213         mode |= S_IFDIR;
 214         err = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode);
 215         if (err) {
 216                 goto out;
 217         } else if (d_unhashed(dentry)) {
 218                 struct dentry *d;
 219
 220                 d = lookup_one(idmap, dentry->d_name.name, dentry->d_parent,
 221                                dentry->d_name.len);
 222                 if (IS_ERR(d)) {
 223                         err = PTR_ERR(d);
 224                         goto out;
 225                 }
 226                 if (unlikely(d_is_negative(d))) {
 227                         dput(d);
 228                         err = -ENOENT;
 229                         goto out;
 230                 }
 231
 232                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
 233                 dput(d);
 234         }
 235 out:
 236         done_path_create(&path, dentry);
 237         if (err)
 238                 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err);
 239         return err;
 240 }
 241
 242 static ssize_t ksmbd_vfs_getcasexattr(struct mnt_idmap *idmap,
 243                                       struct dentry *dentry, char *attr_name,
 244                                       int attr_name_len, char **attr_value)
 245 {
 246         char *name, *xattr_list = NULL;
 247         ssize_t value_len = -ENOENT, xattr_list_len;
 248
 249         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
 250         if (xattr_list_len <= 0)
 251                 goto out;
 252
 253         for (name = xattr_list; name - xattr_list < xattr_list_len;
 254                         name += strlen(name) + 1) {
 255                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
 256                 if (strncasecmp(attr_name, name, attr_name_len))
 257                         continue;
 258
 259                 value_len = ksmbd_vfs_getxattr(idmap,
 260                                                dentry,
 261                                                name,
 262                                                attr_value);
 263                 if (value_len < 0)
 264                         pr_err("failed to get xattr in file\n");
 265                 break;
 266         }
 267
 268 out:
 269         kvfree(xattr_list);
 270         return value_len;
 271 }
 272
 273 static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
 274                                  size_t count)
 275 {
 276         ssize_t v_len;
 277         char *stream_buf = NULL;
 278
 279         ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
 280                     *pos, count);
 281
 282         v_len = ksmbd_vfs_getcasexattr(file_mnt_idmap(fp->filp),
 283                                        fp->filp->f_path.dentry,
 284                                        fp->stream.name,
 285                                        fp->stream.size,
 286                                        &stream_buf);
 287         if ((int)v_len <= 0)
 288                 return (int)v_len;
 289
 290         if (v_len <= *pos) {
 291                 count = -EINVAL;
 292                 goto free_buf;
 293         }
 294
 295         if (v_len - *pos < count)
 296                 count = v_len - *pos;
 297
 298         memcpy(buf, &stream_buf[*pos], count);
 299
 300 free_buf:
 301         kvfree(stream_buf);
 302         return count;
 303 }
 304
 305 /**
 306  * check_lock_range() - vfs helper for smb byte range file locking
 307  * @filp:       the file to apply the lock to
 308  * @start:      lock start byte offset
 309  * @end:        lock end byte offset
 310  * @type:       byte range type read/write
 311  *
 312  * Return:      0 on success, otherwise error
 313  */
 314 static int check_lock_range(struct file *filp, loff_t start, loff_t end,
 315                             unsigned char type)
 316 {
 317         struct file_lock *flock;
 318         struct file_lock_context *ctx = locks_inode_context(file_inode(filp));
 319         int error = 0;
 320
 321         if (!ctx || list_empty_careful(&ctx->flc_posix))
 322                 return 0;
 323
 324         spin_lock(&ctx->flc_lock);
 325         list_for_each_entry(flock, &ctx->flc_posix, fl_list) {
 326                 /* check conflict locks */
 327                 if (flock->fl_end >= start && end >= flock->fl_start) {
 328                         if (flock->fl_type == F_RDLCK) {
 329                                 if (type == WRITE) {
 330                                         pr_err("not allow write by shared lock\n");
 331                                         error = 1;
 332                                         goto out;
 333                                 }
 334                         } else if (flock->fl_type == F_WRLCK) {
 335                                 /* check owner in lock */
 336                                 if (flock->fl_file != filp) {
 337                                         error = 1;
 338                                         pr_err("not allow rw access by exclusive lock from other opens\n");
 339                                         goto out;
 340                                 }
 341                         }
 342                 }
 343         }
 344 out:
 345         spin_unlock(&ctx->flc_lock);
 346         return error;
 347 }
 348
 349 /**
 350  * ksmbd_vfs_read() - vfs helper for smb file read
 351  * @work:       smb work
 352  * @fid:        file id of open file
 353  * @count:      read byte count
 354  * @pos:        file pos
 355  *
 356  * Return:      number of read bytes on success, otherwise error
 357  */
 358 int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count,
 359                    loff_t *pos)
 360 {
 361         struct file *filp = fp->filp;
 362         ssize_t nbytes = 0;
 363         char *rbuf = work->aux_payload_buf;
 364         struct inode *inode = file_inode(filp);
 365
 366         if (S_ISDIR(inode->i_mode))
 367                 return -EISDIR;
 368
 369         if (unlikely(count == 0))
 370                 return 0;
 371
 372         if (work->conn->connection_type) {
 373                 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
 374                         pr_err("no right to read(%pD)\n", fp->filp);
 375                         return -EACCES;
 376                 }
 377         }
 378
 379         if (ksmbd_stream_fd(fp))
 380                 return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
 381
 382         if (!work->tcon->posix_extensions) {
 383                 int ret;
 384
 385                 ret = check_lock_range(filp, *pos, *pos + count - 1, READ);
 386                 if (ret) {
 387                         pr_err("unable to read due to lock\n");
 388                         return -EAGAIN;
 389                 }
 390         }
 391
 392         nbytes = kernel_read(filp, rbuf, count, pos);
 393         if (nbytes < 0) {
 394                 pr_err("smb read failed, err = %zd\n", nbytes);
 395                 return nbytes;
 396         }
 397
 398         filp->f_pos = *pos;
 399         return nbytes;
 400 }
 401
 402 static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
 403                                   size_t count)
 404 {
 405         char *stream_buf = NULL, *wbuf;
 406         struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
 407         size_t size, v_len;
 408         int err = 0;
 409
 410         ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
 411                     *pos, count);
 412
 413         size = *pos + count;
 414         if (size > XATTR_SIZE_MAX) {
 415                 size = XATTR_SIZE_MAX;
 416                 count = (*pos + count) - XATTR_SIZE_MAX;
 417         }
 418
 419         v_len = ksmbd_vfs_getcasexattr(idmap,
 420                                        fp->filp->f_path.dentry,
 421                                        fp->stream.name,
 422                                        fp->stream.size,
 423                                        &stream_buf);
 424         if ((int)v_len < 0) {
 425                 pr_err("not found stream in xattr : %zd\n", v_len);
 426                 err = (int)v_len;
 427                 goto out;
 428         }
 429
 430         if (v_len < size) {
 431                 wbuf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
 432                 if (!wbuf) {
 433                         err = -ENOMEM;
 434                         goto out;
 435                 }
 436
 437                 if (v_len > 0)
 438                         memcpy(wbuf, stream_buf, v_len);
 439                 kvfree(stream_buf);
 440                 stream_buf = wbuf;
 441         }
 442
 443         memcpy(&stream_buf[*pos], buf, count);
 444
 445         err = ksmbd_vfs_setxattr(idmap,
 446                                  fp->filp->f_path.dentry,
 447                                  fp->stream.name,
 448                                  (void *)stream_buf,
 449                                  size,
 450                                  0);
 451         if (err < 0)
 452                 goto out;
 453
 454         fp->filp->f_pos = *pos;
 455         err = 0;
 456 out:
 457         kvfree(stream_buf);
 458         return err;
 459 }
 460
 461 /**
 462  * ksmbd_vfs_write() - vfs helper for smb file write
 463  * @work:       work
 464  * @fid:        file id of open file
 465  * @buf:        buf containing data for writing
 466  * @count:      read byte count
 467  * @pos:        file pos
 468  * @sync:       fsync after write
 469  * @written:    number of bytes written
 470  *
 471  * Return:      0 on success, otherwise error
 472  */
 473 int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
 474                     char *buf, size_t count, loff_t *pos, bool sync,
 475                     ssize_t *written)
 476 {
 477         struct file *filp;
 478         loff_t  offset = *pos;
 479         int err = 0;
 480
 481         if (work->conn->connection_type) {
 482                 if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
 483                         pr_err("no right to write(%pD)\n", fp->filp);
 484                         err = -EACCES;
 485                         goto out;
 486                 }
 487         }
 488
 489         filp = fp->filp;
 490
 491         if (ksmbd_stream_fd(fp)) {
 492                 err = ksmbd_vfs_stream_write(fp, buf, pos, count);
 493                 if (!err)
 494                         *written = count;
 495                 goto out;
 496         }
 497
 498         if (!work->tcon->posix_extensions) {
 499                 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
 500                 if (err) {
 501                         pr_err("unable to write due to lock\n");
 502                         err = -EAGAIN;
 503                         goto out;
 504                 }
 505         }
 506
 507         /* Do we need to break any of a levelII oplock? */
 508         smb_break_all_levII_oplock(work, fp, 1);
 509
 510         err = kernel_write(filp, buf, count, pos);
 511         if (err < 0) {
 512                 ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
 513                 goto out;
 514         }
 515
 516         filp->f_pos = *pos;
 517         *written = err;
 518         err = 0;
 519         if (sync) {
 520                 err = vfs_fsync_range(filp, offset, offset + *written, 0);
 521                 if (err < 0)
 522                         pr_err("fsync failed for filename = %pD, err = %d\n",
 523                                fp->filp, err);
 524         }
 525
 526 out:
 527         return err;
 528 }
 529
 530 /**
 531  * ksmbd_vfs_getattr() - vfs helper for smb getattr
 532  * @work:       work
 533  * @fid:        file id of open file
 534  * @attrs:      inode attributes
 535  *
 536  * Return:      0 on success, otherwise error
 537  */
 538 int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
 539 {
 540         int err;
 541
 542         err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
 543         if (err)
 544                 pr_err("getattr failed, err %d\n", err);
 545         return err;
 546 }
 547
 548 /**
 549  * ksmbd_vfs_fsync() - vfs helper for smb fsync
 550  * @work:       work
 551  * @fid:        file id of open file
 552  *
 553  * Return:      0 on success, otherwise error
 554  */
 555 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
 556 {
 557         struct ksmbd_file *fp;
 558         int err;
 559
 560         fp = ksmbd_lookup_fd_slow(work, fid, p_id);
 561         if (!fp) {
 562                 pr_err("failed to get filp for fid %llu\n", fid);
 563                 return -ENOENT;
 564         }
 565         err = vfs_fsync(fp->filp, 0);
 566         if (err < 0)
 567                 pr_err("smb fsync failed, err = %d\n", err);
 568         ksmbd_fd_put(work, fp);
 569         return err;
 570 }
 571
 572 /**
 573  * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
 574  * @name:       directory or file name that is relative to share
 575  *
 576  * Return:      0 on success, otherwise error
 577  */
 578 int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)
 579 {
 580         struct mnt_idmap *idmap;
 581         struct dentry *parent = path->dentry->d_parent;
 582         int err;
 583
 584         if (ksmbd_override_fsids(work))
 585                 return -ENOMEM;
 586
 587         if (!d_inode(path->dentry)->i_nlink) {
 588                 err = -ENOENT;
 589                 goto out_err;
 590         }
 591
 592         idmap = mnt_idmap(path->mnt);
 593         if (S_ISDIR(d_inode(path->dentry)->i_mode)) {
 594                 err = vfs_rmdir(idmap, d_inode(parent), path->dentry);
 595                 if (err && err != -ENOTEMPTY)
 596                         ksmbd_debug(VFS, "rmdir failed, err %d\n", err);
 597         } else {
 598                 err = vfs_unlink(idmap, d_inode(parent), path->dentry, NULL);
 599                 if (err)
 600                         ksmbd_debug(VFS, "unlink failed, err %d\n", err);
 601         }
 602
 603 out_err:
 604         ksmbd_revert_fsids(work);
 605         return err;
 606 }
 607
 608 /**
 609  * ksmbd_vfs_link() - vfs helper for creating smb hardlink
 610  * @oldname:    source file name
 611  * @newname:    hardlink name that is relative to share
 612  *
 613  * Return:      0 on success, otherwise error
 614  */
 615 int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
 616                    const char *newname)
 617 {
 618         struct path oldpath, newpath;
 619         struct dentry *dentry;
 620         int err;
 621
 622         if (ksmbd_override_fsids(work))
 623                 return -ENOMEM;
 624
 625         err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
 626         if (err) {
 627                 pr_err("cannot get linux path for %s, err = %d\n",
 628                        oldname, err);
 629                 goto out1;
 630         }
 631
 632         dentry = ksmbd_vfs_kern_path_create(work, newname,
 633                                             LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
 634                                             &newpath);
 635         if (IS_ERR(dentry)) {
 636                 err = PTR_ERR(dentry);
 637                 pr_err("path create err for %s, err %d\n", newname, err);
 638                 goto out2;
 639         }
 640
 641         err = -EXDEV;
 642         if (oldpath.mnt != newpath.mnt) {
 643                 pr_err("vfs_link failed err %d\n", err);
 644                 goto out3;
 645         }
 646
 647         err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt),
 648                        d_inode(newpath.dentry),
 649                        dentry, NULL);
 650         if (err)
 651                 ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
 652
 653 out3:
 654         done_path_create(&newpath, dentry);
 655 out2:
 656         path_put(&oldpath);
 657 out1:
 658         ksmbd_revert_fsids(work);
 659         return err;
 660 }
 661
 662 int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
 663                      char *newname, int flags)
 664 {
 665         struct dentry *old_parent, *new_dentry, *trap;
 666         struct dentry *old_child = old_path->dentry;
 667         struct path new_path;
 668         struct qstr new_last;
 669         struct renamedata rd;
 670         struct filename *to;
 671         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
 672         struct ksmbd_file *parent_fp;
 673         int new_type;
 674         int err, lookup_flags = LOOKUP_NO_SYMLINKS;
 675
 676         if (ksmbd_override_fsids(work))
 677                 return -ENOMEM;
 678
 679         to = getname_kernel(newname);
 680         if (IS_ERR(to)) {
 681                 err = PTR_ERR(to);
 682                 goto revert_fsids;
 683         }
 684
 685 retry:
 686         err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH,
 687                                      &new_path, &new_last, &new_type,
 688                                      &share_conf->vfs_path);
 689         if (err)
 690                 goto out1;
 691
 692         if (old_path->mnt != new_path.mnt) {
 693                 err = -EXDEV;
 694                 goto out2;
 695         }
 696
 697         trap = lock_rename_child(old_child, new_path.dentry);
 698
 699         old_parent = dget(old_child->d_parent);
 700         if (d_unhashed(old_child)) {
 701                 err = -EINVAL;
 702                 goto out3;
 703         }
 704
 705         parent_fp = ksmbd_lookup_fd_inode(d_inode(old_child->d_parent));
 706         if (parent_fp) {
 707                 if (parent_fp->daccess & FILE_DELETE_LE) {
 708                         pr_err("parent dir is opened with delete access\n");
 709                         err = -ESHARE;
 710                         ksmbd_fd_put(work, parent_fp);
 711                         goto out3;
 712                 }
 713                 ksmbd_fd_put(work, parent_fp);
 714         }
 715
 716         new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry,
 717                                           lookup_flags | LOOKUP_RENAME_TARGET);
 718         if (IS_ERR(new_dentry)) {
 719                 err = PTR_ERR(new_dentry);
 720                 goto out3;
 721         }
 722
 723         if (d_is_symlink(new_dentry)) {
 724                 err = -EACCES;
 725                 goto out4;
 726         }
 727
 728         if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) {
 729                 err = -EEXIST;
 730                 goto out4;
 731         }
 732
 733         if (old_child == trap) {
 734                 err = -EINVAL;
 735                 goto out4;
 736         }
 737
 738         if (new_dentry == trap) {
 739                 err = -ENOTEMPTY;
 740                 goto out4;
 741         }
 742
 743         rd.old_mnt_idmap        = mnt_idmap(old_path->mnt),
 744         rd.old_dir              = d_inode(old_parent),
 745         rd.old_dentry           = old_child,
 746         rd.new_mnt_idmap        = mnt_idmap(new_path.mnt),
 747         rd.new_dir              = new_path.dentry->d_inode,
 748         rd.new_dentry           = new_dentry,
 749         rd.flags                = flags,
 750         rd.delegated_inode      = NULL,
 751         err = vfs_rename(&rd);
 752         if (err)
 753                 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);
 754
 755 out4:
 756         dput(new_dentry);
 757 out3:
 758         dput(old_parent);
 759         unlock_rename(old_parent, new_path.dentry);
 760 out2:
 761         path_put(&new_path);
 762
 763         if (retry_estale(err, lookup_flags)) {
 764                 lookup_flags |= LOOKUP_REVAL;
 765                 goto retry;
 766         }
 767 out1:
 768         putname(to);
 769 revert_fsids:
 770         ksmbd_revert_fsids(work);
 771         return err;
 772 }
 773
 774 /**
 775  * ksmbd_vfs_truncate() - vfs helper for smb file truncate
 776  * @work:       work
 777  * @fid:        file id of old file
 778  * @size:       truncate to given size
 779  *
 780  * Return:      0 on success, otherwise error
 781  */
 782 int ksmbd_vfs_truncate(struct ksmbd_work *work,
 783                        struct ksmbd_file *fp, loff_t size)
 784 {
 785         int err = 0;
 786         struct file *filp;
 787
 788         filp = fp->filp;
 789
 790         /* Do we need to break any of a levelII oplock? */
 791         smb_break_all_levII_oplock(work, fp, 1);
 792
 793         if (!work->tcon->posix_extensions) {
 794                 struct inode *inode = file_inode(filp);
 795
 796                 if (size < inode->i_size) {
 797                         err = check_lock_range(filp, size,
 798                                                inode->i_size - 1, WRITE);
 799                 } else {
 800                         err = check_lock_range(filp, inode->i_size,
 801                                                size - 1, WRITE);
 802                 }
 803
 804                 if (err) {
 805                         pr_err("failed due to lock\n");
 806                         return -EAGAIN;
 807                 }
 808         }
 809
 810         err = vfs_truncate(&filp->f_path, size);
 811         if (err)
 812                 pr_err("truncate failed, err %d\n", err);
 813         return err;
 814 }
 815
 816 /**
 817  * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
 818  * @dentry:     dentry of file for listing xattrs
 819  * @list:       destination buffer
 820  * @size:       destination buffer length
 821  *
 822  * Return:      xattr list length on success, otherwise error
 823  */
 824 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
 825 {
 826         ssize_t size;
 827         char *vlist = NULL;
 828
 829         size = vfs_listxattr(dentry, NULL, 0);
 830         if (size <= 0)
 831                 return size;
 832
 833         vlist = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
 834         if (!vlist)
 835                 return -ENOMEM;
 836
 837         *list = vlist;
 838         size = vfs_listxattr(dentry, vlist, size);
 839         if (size < 0) {
 840                 ksmbd_debug(VFS, "listxattr failed\n");
 841                 kvfree(vlist);
 842                 *list = NULL;
 843         }
 844
 845         return size;
 846 }
 847
 848 static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap,
 849                                    struct dentry *dentry, char *xattr_name)
 850 {
 851         return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0);
 852 }
 853
 854 /**
 855  * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
 856  * @idmap:      idmap
 857  * @dentry:     dentry of file for getting xattrs
 858  * @xattr_name: name of xattr name to query
 859  * @xattr_buf:  destination buffer xattr value
 860  *
 861  * Return:      read xattr value length on success, otherwise error
 862  */
 863 ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap,
 864                            struct dentry *dentry,
 865                            char *xattr_name, char **xattr_buf)
 866 {
 867         ssize_t xattr_len;
 868         char *buf;
 869
 870         *xattr_buf = NULL;
 871         xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name);
 872         if (xattr_len < 0)
 873                 return xattr_len;
 874
 875         buf = kmalloc(xattr_len + 1, GFP_KERNEL);
 876         if (!buf)
 877                 return -ENOMEM;
 878
 879         xattr_len = vfs_getxattr(idmap, dentry, xattr_name,
 880                                  (void *)buf, xattr_len);
 881         if (xattr_len > 0)
 882                 *xattr_buf = buf;
 883         else
 884                 kfree(buf);
 885         return xattr_len;
 886 }
 887
 888 /**
 889  * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
 890  * @idmap:      idmap of the relevant mount
 891  * @dentry:     dentry to set XATTR at
 892  * @attr_name:  xattr name for setxattr
 893  * @attr_value: xattr value to set
 894  * @attr_size:  size of xattr value
 895  * @flags:      destination buffer length
 896  *
 897  * Return:      0 on success, otherwise error
 898  */
 899 int ksmbd_vfs_setxattr(struct mnt_idmap *idmap,
 900                        struct dentry *dentry, const char *attr_name,
 901                        void *attr_value, size_t attr_size, int flags)
 902 {
 903         int err;
 904
 905         err = vfs_setxattr(idmap,
 906                            dentry,
 907                            attr_name,
 908                            attr_value,
 909                            attr_size,
 910                            flags);
 911         if (err)
 912                 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
 913         return err;
 914 }
 915
 916 /**
 917  * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
 918  * @filp:       file pointer for IO
 919  * @options:    smb IO options
 920  */
 921 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
 922 {
 923         struct address_space *mapping;
 924
 925         mapping = filp->f_mapping;
 926
 927         if (!option || !mapping)
 928                 return;
 929
 930         if (option & FILE_WRITE_THROUGH_LE) {
 931                 filp->f_flags |= O_SYNC;
 932         } else if (option & FILE_SEQUENTIAL_ONLY_LE) {
 933                 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
 934                 spin_lock(&filp->f_lock);
 935                 filp->f_mode &= ~FMODE_RANDOM;
 936                 spin_unlock(&filp->f_lock);
 937         } else if (option & FILE_RANDOM_ACCESS_LE) {
 938                 spin_lock(&filp->f_lock);
 939                 filp->f_mode |= FMODE_RANDOM;
 940                 spin_unlock(&filp->f_lock);
 941         }
 942 }
 943
 944 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
 945                         loff_t off, loff_t len)
 946 {
 947         smb_break_all_levII_oplock(work, fp, 1);
 948         if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
 949                 return vfs_fallocate(fp->filp,
 950                                      FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
 951                                      off, len);
 952
 953         return vfs_fallocate(fp->filp,
 954                              FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
 955                              off, len);
 956 }
 957
 958 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
 959                          struct file_allocated_range_buffer *ranges,
 960                          unsigned int in_count, unsigned int *out_count)
 961 {
 962         struct file *f = fp->filp;
 963         struct inode *inode = file_inode(fp->filp);
 964         loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
 965         loff_t extent_start, extent_end;
 966         int ret = 0;
 967
 968         if (start > maxbytes)
 969                 return -EFBIG;
 970
 971         if (!in_count)
 972                 return 0;
 973
 974         /*
 975          * Shrink request scope to what the fs can actually handle.
 976          */
 977         if (length > maxbytes || (maxbytes - length) < start)
 978                 length = maxbytes - start;
 979
 980         if (start + length > inode->i_size)
 981                 length = inode->i_size - start;
 982
 983         *out_count = 0;
 984         end = start + length;
 985         while (start < end && *out_count < in_count) {
 986                 extent_start = vfs_llseek(f, start, SEEK_DATA);
 987                 if (extent_start < 0) {
 988                         if (extent_start != -ENXIO)
 989                                 ret = (int)extent_start;
 990                         break;
 991                 }
 992
 993                 if (extent_start >= end)
 994                         break;
 995
 996                 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
 997                 if (extent_end < 0) {
 998                         if (extent_end != -ENXIO)
 999                                 ret = (int)extent_end;
1000                         break;
1001                 } else if (extent_start >= extent_end) {
1002                         break;
1003                 }
1004
1005                 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1006                 ranges[(*out_count)++].length =
1007                         cpu_to_le64(min(extent_end, end) - extent_start);
1008
1009                 start = extent_end;
1010         }
1011
1012         return ret;
1013 }
1014
1015 int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap,
1016                            struct dentry *dentry, char *attr_name)
1017 {
1018         return vfs_removexattr(idmap, dentry, attr_name);
1019 }
1020
1021 int ksmbd_vfs_unlink(struct file *filp)
1022 {
1023         int err = 0;
1024         struct dentry *dir, *dentry = filp->f_path.dentry;
1025         struct mnt_idmap *idmap = file_mnt_idmap(filp);
1026
1027         dir = dget_parent(dentry);
1028         err = ksmbd_vfs_lock_parent(dir, dentry);
1029         if (err)
1030                 goto out;
1031         dget(dentry);
1032
1033         if (S_ISDIR(d_inode(dentry)->i_mode))
1034                 err = vfs_rmdir(idmap, d_inode(dir), dentry);
1035         else
1036                 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL);
1037
1038         dput(dentry);
1039         inode_unlock(d_inode(dir));
1040         if (err)
1041                 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1042 out:
1043         dput(dir);
1044
1045         return err;
1046 }
1047
1048 static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1049                        loff_t offset, u64 ino, unsigned int d_type)
1050 {
1051         struct ksmbd_readdir_data *buf;
1052
1053         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1054         buf->dirent_count++;
1055
1056         return buf->dirent_count <= 2;
1057 }
1058
1059 /**
1060  * ksmbd_vfs_empty_dir() - check for empty directory
1061  * @fp: ksmbd file pointer
1062  *
1063  * Return:      true if directory empty, otherwise false
1064  */
1065 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1066 {
1067         int err;
1068         struct ksmbd_readdir_data readdir_data;
1069
1070         memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1071
1072         set_ctx_actor(&readdir_data.ctx, __dir_empty);
1073         readdir_data.dirent_count = 0;
1074
1075         err = iterate_dir(fp->filp, &readdir_data.ctx);
1076         if (readdir_data.dirent_count > 2)
1077                 err = -ENOTEMPTY;
1078         else
1079                 err = 0;
1080         return err;
1081 }
1082
1083 static bool __caseless_lookup(struct dir_context *ctx, const char *name,
1084                              int namlen, loff_t offset, u64 ino,
1085                              unsigned int d_type)
1086 {
1087         struct ksmbd_readdir_data *buf;
1088         int cmp = -EINVAL;
1089
1090         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1091
1092         if (buf->used != namlen)
1093                 return true;
1094         if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
1095                 const struct qstr q_buf = {.name = buf->private,
1096                                            .len = buf->used};
1097                 const struct qstr q_name = {.name = name,
1098                                             .len = namlen};
1099
1100                 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
1101         }
1102         if (cmp < 0)
1103                 cmp = strncasecmp((char *)buf->private, name, namlen);
1104         if (!cmp) {
1105                 memcpy((char *)buf->private, name, namlen);
1106                 buf->dirent_count = 1;
1107                 return false;
1108         }
1109         return true;
1110 }
1111
1112 /**
1113  * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1114  * @dir:        path info
1115  * @name:       filename to lookup
1116  * @namelen:    filename length
1117  *
1118  * Return:      0 on success, otherwise error
1119  */
1120 static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
1121                                    size_t namelen, struct unicode_map *um)
1122 {
1123         int ret;
1124         struct file *dfilp;
1125         int flags = O_RDONLY | O_LARGEFILE;
1126         struct ksmbd_readdir_data readdir_data = {
1127                 .ctx.actor      = __caseless_lookup,
1128                 .private        = name,
1129                 .used           = namelen,
1130                 .dirent_count   = 0,
1131                 .um             = um,
1132         };
1133
1134         dfilp = dentry_open(dir, flags, current_cred());
1135         if (IS_ERR(dfilp))
1136                 return PTR_ERR(dfilp);
1137
1138         ret = iterate_dir(dfilp, &readdir_data.ctx);
1139         if (readdir_data.dirent_count > 0)
1140                 ret = 0;
1141         fput(dfilp);
1142         return ret;
1143 }
1144
1145 /**
1146  * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
1147  * @name:       file path that is relative to share
1148  * @flags:      lookup flags
1149  * @path:       if lookup succeed, return path info
1150  * @caseless:   caseless filename lookup
1151  *
1152  * Return:      0 on success, otherwise error
1153  */
1154 int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
1155                                unsigned int flags, struct path *path,
1156                                bool caseless)
1157 {
1158         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1159         int err;
1160         struct path parent_path;
1161
1162         err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, path);
1163         if (!err)
1164                 return err;
1165
1166         if (caseless) {
1167                 char *filepath;
1168                 size_t path_len, remain_len;
1169
1170                 filepath = kstrdup(name, GFP_KERNEL);
1171                 if (!filepath)
1172                         return -ENOMEM;
1173
1174                 path_len = strlen(filepath);
1175                 remain_len = path_len;
1176
1177                 parent_path = share_conf->vfs_path;
1178                 path_get(&parent_path);
1179
1180                 while (d_can_lookup(parent_path.dentry)) {
1181                         char *filename = filepath + path_len - remain_len;
1182                         char *next = strchrnul(filename, '/');
1183                         size_t filename_len = next - filename;
1184                         bool is_last = !next[0];
1185
1186                         if (filename_len == 0)
1187                                 break;
1188
1189                         err = ksmbd_vfs_lookup_in_dir(&parent_path, filename,
1190                                                       filename_len,
1191                                                       work->conn->um);
1192                         if (err)
1193                                 goto out2;
1194
1195                         next[0] = '\0';
1196
1197                         err = vfs_path_lookup(share_conf->vfs_path.dentry,
1198                                               share_conf->vfs_path.mnt,
1199                                               filepath,
1200                                               flags,
1201                                               path);
1202                         if (err)
1203                                 goto out2;
1204                         else if (is_last)
1205                                 goto out1;
1206                         path_put(&parent_path);
1207                         parent_path = *path;
1208
1209                         next[0] = '/';
1210                         remain_len -= filename_len + 1;
1211                 }
1212
1213                 err = -EINVAL;
1214 out2:
1215                 path_put(&parent_path);
1216 out1:
1217                 kfree(filepath);
1218         }
1219
1220         if (!err) {
1221                 err = ksmbd_vfs_lock_parent(parent_path.dentry, path->dentry);
1222                 if (err)
1223                         dput(path->dentry);
1224                 path_put(&parent_path);
1225         }
1226         return err;
1227 }
1228
1229 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1230                                           const char *name,
1231                                           unsigned int flags,
1232                                           struct path *path)
1233 {
1234         char *abs_name;
1235         struct dentry *dent;
1236
1237         abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1238         if (!abs_name)
1239                 return ERR_PTR(-ENOMEM);
1240
1241         dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1242         kfree(abs_name);
1243         return dent;
1244 }
1245
1246 int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap,
1247                                 struct dentry *dentry)
1248 {
1249         char *name, *xattr_list = NULL;
1250         ssize_t xattr_list_len;
1251         int err = 0;
1252
1253         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1254         if (xattr_list_len < 0) {
1255                 goto out;
1256         } else if (!xattr_list_len) {
1257                 ksmbd_debug(SMB, "empty xattr in the file\n");
1258                 goto out;
1259         }
1260
1261         for (name = xattr_list; name - xattr_list < xattr_list_len;
1262              name += strlen(name) + 1) {
1263                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1264
1265                 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1266                              sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1267                     !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1268                              sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1269                         err = vfs_remove_acl(idmap, dentry, name);
1270                         if (err)
1271                                 ksmbd_debug(SMB,
1272                                             "remove acl xattr failed : %s\n", name);
1273                 }
1274         }
1275 out:
1276         kvfree(xattr_list);
1277         return err;
1278 }
1279
1280 int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap,
1281                                struct dentry *dentry)
1282 {
1283         char *name, *xattr_list = NULL;
1284         ssize_t xattr_list_len;
1285         int err = 0;
1286
1287         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1288         if (xattr_list_len < 0) {
1289                 goto out;
1290         } else if (!xattr_list_len) {
1291                 ksmbd_debug(SMB, "empty xattr in the file\n");
1292                 goto out;
1293         }
1294
1295         for (name = xattr_list; name - xattr_list < xattr_list_len;
1296                         name += strlen(name) + 1) {
1297                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1298
1299                 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1300                         err = ksmbd_vfs_remove_xattr(idmap, dentry, name);
1301                         if (err)
1302                                 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1303                 }
1304         }
1305 out:
1306         kvfree(xattr_list);
1307         return err;
1308 }
1309
1310 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap,
1311                                                             struct inode *inode,
1312                                                             int acl_type)
1313 {
1314         struct xattr_smb_acl *smb_acl = NULL;
1315         struct posix_acl *posix_acls;
1316         struct posix_acl_entry *pa_entry;
1317         struct xattr_acl_entry *xa_entry;
1318         int i;
1319
1320         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1321                 return NULL;
1322
1323         posix_acls = get_inode_acl(inode, acl_type);
1324         if (!posix_acls)
1325                 return NULL;
1326
1327         smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1328                           sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1329                           GFP_KERNEL);
1330         if (!smb_acl)
1331                 goto out;
1332
1333         smb_acl->count = posix_acls->a_count;
1334         pa_entry = posix_acls->a_entries;
1335         xa_entry = smb_acl->entries;
1336         for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1337                 switch (pa_entry->e_tag) {
1338                 case ACL_USER:
1339                         xa_entry->type = SMB_ACL_USER;
1340                         xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry);
1341                         break;
1342                 case ACL_USER_OBJ:
1343                         xa_entry->type = SMB_ACL_USER_OBJ;
1344                         break;
1345                 case ACL_GROUP:
1346                         xa_entry->type = SMB_ACL_GROUP;
1347                         xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry);
1348                         break;
1349                 case ACL_GROUP_OBJ:
1350                         xa_entry->type = SMB_ACL_GROUP_OBJ;
1351                         break;
1352                 case ACL_OTHER:
1353                         xa_entry->type = SMB_ACL_OTHER;
1354                         break;
1355                 case ACL_MASK:
1356                         xa_entry->type = SMB_ACL_MASK;
1357                         break;
1358                 default:
1359                         pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1360                         goto out;
1361                 }
1362
1363                 if (pa_entry->e_perm & ACL_READ)
1364                         xa_entry->perm |= SMB_ACL_READ;
1365                 if (pa_entry->e_perm & ACL_WRITE)
1366                         xa_entry->perm |= SMB_ACL_WRITE;
1367                 if (pa_entry->e_perm & ACL_EXECUTE)
1368                         xa_entry->perm |= SMB_ACL_EXECUTE;
1369         }
1370 out:
1371         posix_acl_release(posix_acls);
1372         return smb_acl;
1373 }
1374
1375 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1376                            struct mnt_idmap *idmap,
1377                            struct dentry *dentry,
1378                            struct smb_ntsd *pntsd, int len)
1379 {
1380         int rc;
1381         struct ndr sd_ndr = {0}, acl_ndr = {0};
1382         struct xattr_ntacl acl = {0};
1383         struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1384         struct inode *inode = d_inode(dentry);
1385
1386         acl.version = 4;
1387         acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1388         acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1389
1390         memcpy(acl.desc, "posix_acl", 9);
1391         acl.desc_len = 10;
1392
1393         pntsd->osidoffset =
1394                 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1395         pntsd->gsidoffset =
1396                 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1397         pntsd->dacloffset =
1398                 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1399
1400         acl.sd_buf = (char *)pntsd;
1401         acl.sd_size = len;
1402
1403         rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1404         if (rc) {
1405                 pr_err("failed to generate hash for ndr acl\n");
1406                 return rc;
1407         }
1408
1409         smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1410                                                  ACL_TYPE_ACCESS);
1411         if (S_ISDIR(inode->i_mode))
1412                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1413                                                              ACL_TYPE_DEFAULT);
1414
1415         rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode,
1416                                   smb_acl, def_smb_acl);
1417         if (rc) {
1418                 pr_err("failed to encode ndr to posix acl\n");
1419                 goto out;
1420         }
1421
1422         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1423                                acl.posix_acl_hash);
1424         if (rc) {
1425                 pr_err("failed to generate hash for ndr acl\n");
1426                 goto out;
1427         }
1428
1429         rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1430         if (rc) {
1431                 pr_err("failed to encode ndr to posix acl\n");
1432                 goto out;
1433         }
1434
1435         rc = ksmbd_vfs_setxattr(idmap, dentry,
1436                                 XATTR_NAME_SD, sd_ndr.data,
1437                                 sd_ndr.offset, 0);
1438         if (rc < 0)
1439                 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1440
1441         kfree(sd_ndr.data);
1442 out:
1443         kfree(acl_ndr.data);
1444         kfree(smb_acl);
1445         kfree(def_smb_acl);
1446         return rc;
1447 }
1448
1449 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1450                            struct mnt_idmap *idmap,
1451                            struct dentry *dentry,
1452                            struct smb_ntsd **pntsd)
1453 {
1454         int rc;
1455         struct ndr n;
1456         struct inode *inode = d_inode(dentry);
1457         struct ndr acl_ndr = {0};
1458         struct xattr_ntacl acl;
1459         struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1460         __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1461
1462         rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data);
1463         if (rc <= 0)
1464                 return rc;
1465
1466         n.length = rc;
1467         rc = ndr_decode_v4_ntacl(&n, &acl);
1468         if (rc)
1469                 goto free_n_data;
1470
1471         smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1472                                                  ACL_TYPE_ACCESS);
1473         if (S_ISDIR(inode->i_mode))
1474                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1475                                                              ACL_TYPE_DEFAULT);
1476
1477         rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl,
1478                                   def_smb_acl);
1479         if (rc) {
1480                 pr_err("failed to encode ndr to posix acl\n");
1481                 goto out_free;
1482         }
1483
1484         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1485         if (rc) {
1486                 pr_err("failed to generate hash for ndr acl\n");
1487                 goto out_free;
1488         }
1489
1490         if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1491                 pr_err("hash value diff\n");
1492                 rc = -EINVAL;
1493                 goto out_free;
1494         }
1495
1496         *pntsd = acl.sd_buf;
1497         if (acl.sd_size < sizeof(struct smb_ntsd)) {
1498                 pr_err("sd size is invalid\n");
1499                 goto out_free;
1500         }
1501
1502         (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1503                                            NDR_NTSD_OFFSETOF);
1504         (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1505                                            NDR_NTSD_OFFSETOF);
1506         (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1507                                            NDR_NTSD_OFFSETOF);
1508
1509         rc = acl.sd_size;
1510 out_free:
1511         kfree(acl_ndr.data);
1512         kfree(smb_acl);
1513         kfree(def_smb_acl);
1514         if (rc < 0) {
1515                 kfree(acl.sd_buf);
1516                 *pntsd = NULL;
1517         }
1518
1519 free_n_data:
1520         kfree(n.data);
1521         return rc;
1522 }
1523
1524 int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap,
1525                                    struct dentry *dentry,
1526                                    struct xattr_dos_attrib *da)
1527 {
1528         struct ndr n;
1529         int err;
1530
1531         err = ndr_encode_dos_attr(&n, da);
1532         if (err)
1533                 return err;
1534
1535         err = ksmbd_vfs_setxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1536                                  (void *)n.data, n.offset, 0);
1537         if (err)
1538                 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1539         kfree(n.data);
1540
1541         return err;
1542 }
1543
1544 int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap,
1545                                    struct dentry *dentry,
1546                                    struct xattr_dos_attrib *da)
1547 {
1548         struct ndr n;
1549         int err;
1550
1551         err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1552                                  (char **)&n.data);
1553         if (err > 0) {
1554                 n.length = err;
1555                 if (ndr_decode_dos_attr(&n, da))
1556                         err = -EINVAL;
1557                 kfree(n.data);
1558         } else {
1559                 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1560         }
1561
1562         return err;
1563 }
1564
1565 /**
1566  * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1567  * @p:          destination buffer
1568  * @ksmbd_kstat:      ksmbd kstat wrapper
1569  */
1570 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1571 {
1572         struct file_directory_info *info = (struct file_directory_info *)(*p);
1573         struct kstat *kstat = ksmbd_kstat->kstat;
1574         u64 time;
1575
1576         info->FileIndex = 0;
1577         info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1578         time = ksmbd_UnixTimeToNT(kstat->atime);
1579         info->LastAccessTime = cpu_to_le64(time);
1580         time = ksmbd_UnixTimeToNT(kstat->mtime);
1581         info->LastWriteTime = cpu_to_le64(time);
1582         time = ksmbd_UnixTimeToNT(kstat->ctime);
1583         info->ChangeTime = cpu_to_le64(time);
1584
1585         if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1586                 info->EndOfFile = 0;
1587                 info->AllocationSize = 0;
1588         } else {
1589                 info->EndOfFile = cpu_to_le64(kstat->size);
1590                 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1591         }
1592         info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1593
1594         return info;
1595 }
1596
1597 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1598                                 struct mnt_idmap *idmap,
1599                                 struct dentry *dentry,
1600                                 struct ksmbd_kstat *ksmbd_kstat)
1601 {
1602         u64 time;
1603         int rc;
1604
1605         generic_fillattr(idmap, d_inode(dentry), ksmbd_kstat->kstat);
1606
1607         time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1608         ksmbd_kstat->create_time = time;
1609
1610         /*
1611          * set default value for the case that store dos attributes is not yes
1612          * or that acl is disable in server's filesystem and the config is yes.
1613          */
1614         if (S_ISDIR(ksmbd_kstat->kstat->mode))
1615                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1616         else
1617                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1618
1619         if (test_share_config_flag(work->tcon->share_conf,
1620                                    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1621                 struct xattr_dos_attrib da;
1622
1623                 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
1624                 if (rc > 0) {
1625                         ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1626                         ksmbd_kstat->create_time = da.create_time;
1627                 } else {
1628                         ksmbd_debug(VFS, "fail to load dos attribute.\n");
1629                 }
1630         }
1631
1632         return 0;
1633 }
1634
1635 ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap,
1636                                 struct dentry *dentry, char *attr_name,
1637                                 int attr_name_len)
1638 {
1639         char *name, *xattr_list = NULL;
1640         ssize_t value_len = -ENOENT, xattr_list_len;
1641
1642         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1643         if (xattr_list_len <= 0)
1644                 goto out;
1645
1646         for (name = xattr_list; name - xattr_list < xattr_list_len;
1647                         name += strlen(name) + 1) {
1648                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1649                 if (strncasecmp(attr_name, name, attr_name_len))
1650                         continue;
1651
1652                 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name);
1653                 break;
1654         }
1655
1656 out:
1657         kvfree(xattr_list);
1658         return value_len;
1659 }
1660
1661 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1662                                 size_t *xattr_stream_name_size, int s_type)
1663 {
1664         char *type, *buf;
1665
1666         if (s_type == DIR_STREAM)
1667                 type = ":$INDEX_ALLOCATION";
1668         else
1669                 type = ":$DATA";
1670
1671         buf = kasprintf(GFP_KERNEL, "%s%s%s",
1672                         XATTR_NAME_STREAM, stream_name, type);
1673         if (!buf)
1674                 return -ENOMEM;
1675
1676         *xattr_stream_name = buf;
1677         *xattr_stream_name_size = strlen(buf) + 1;
1678
1679         return 0;
1680 }
1681
1682 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1683                                struct ksmbd_file *src_fp,
1684                                struct ksmbd_file *dst_fp,
1685                                struct srv_copychunk *chunks,
1686                                unsigned int chunk_count,
1687                                unsigned int *chunk_count_written,
1688                                unsigned int *chunk_size_written,
1689                                loff_t *total_size_written)
1690 {
1691         unsigned int i;
1692         loff_t src_off, dst_off, src_file_size;
1693         size_t len;
1694         int ret;
1695
1696         *chunk_count_written = 0;
1697         *chunk_size_written = 0;
1698         *total_size_written = 0;
1699
1700         if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1701                 pr_err("no right to read(%pD)\n", src_fp->filp);
1702                 return -EACCES;
1703         }
1704         if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1705                 pr_err("no right to write(%pD)\n", dst_fp->filp);
1706                 return -EACCES;
1707         }
1708
1709         if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1710                 return -EBADF;
1711
1712         smb_break_all_levII_oplock(work, dst_fp, 1);
1713
1714         if (!work->tcon->posix_extensions) {
1715                 for (i = 0; i < chunk_count; i++) {
1716                         src_off = le64_to_cpu(chunks[i].SourceOffset);
1717                         dst_off = le64_to_cpu(chunks[i].TargetOffset);
1718                         len = le32_to_cpu(chunks[i].Length);
1719
1720                         if (check_lock_range(src_fp->filp, src_off,
1721                                              src_off + len - 1, READ))
1722                                 return -EAGAIN;
1723                         if (check_lock_range(dst_fp->filp, dst_off,
1724                                              dst_off + len - 1, WRITE))
1725                                 return -EAGAIN;
1726                 }
1727         }
1728
1729         src_file_size = i_size_read(file_inode(src_fp->filp));
1730
1731         for (i = 0; i < chunk_count; i++) {
1732                 src_off = le64_to_cpu(chunks[i].SourceOffset);
1733                 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1734                 len = le32_to_cpu(chunks[i].Length);
1735
1736                 if (src_off + len > src_file_size)
1737                         return -E2BIG;
1738
1739                 ret = vfs_copy_file_range(src_fp->filp, src_off,
1740                                           dst_fp->filp, dst_off, len, 0);
1741                 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1742                         ret = vfs_copy_file_range(src_fp->filp, src_off,
1743                                                   dst_fp->filp, dst_off, len,
1744                                                   COPY_FILE_SPLICE);
1745                 if (ret < 0)
1746                         return ret;
1747
1748                 *chunk_count_written += 1;
1749                 *total_size_written += ret;
1750         }
1751         return 0;
1752 }
1753
1754 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1755 {
1756         wait_event(flock->fl_wait, !flock->fl_blocker);
1757 }
1758
1759 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1760 {
1761         return wait_event_interruptible_timeout(flock->fl_wait,
1762                                                 !flock->fl_blocker,
1763                                                 timeout);
1764 }
1765
1766 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1767 {
1768         locks_delete_block(flock);
1769 }
1770
1771 int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
1772                                  struct dentry *dentry)
1773 {
1774         struct posix_acl_state acl_state;
1775         struct posix_acl *acls;
1776         struct inode *inode = d_inode(dentry);
1777         int rc;
1778
1779         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1780                 return -EOPNOTSUPP;
1781
1782         ksmbd_debug(SMB, "Set posix acls\n");
1783         rc = init_acl_state(&acl_state, 1);
1784         if (rc)
1785                 return rc;
1786
1787         /* Set default owner group */
1788         acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1789         acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1790         acl_state.other.allow = inode->i_mode & 0007;
1791         acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1792         acl_state.users->aces[acl_state.users->n++].perms.allow =
1793                 acl_state.owner.allow;
1794         acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1795         acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1796                 acl_state.group.allow;
1797         acl_state.mask.allow = 0x07;
1798
1799         acls = posix_acl_alloc(6, GFP_KERNEL);
1800         if (!acls) {
1801                 free_acl_state(&acl_state);
1802                 return -ENOMEM;
1803         }
1804         posix_state_to_acl(&acl_state, acls->a_entries);
1805         rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1806         if (rc < 0)
1807                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1808                             rc);
1809         else if (S_ISDIR(inode->i_mode)) {
1810                 posix_state_to_acl(&acl_state, acls->a_entries);
1811                 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls);
1812                 if (rc < 0)
1813                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1814                                     rc);
1815         }
1816         free_acl_state(&acl_state);
1817         posix_acl_release(acls);
1818         return rc;
1819 }
1820
1821 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
1822                                 struct dentry *dentry, struct inode *parent_inode)
1823 {
1824         struct posix_acl *acls;
1825         struct posix_acl_entry *pace;
1826         struct inode *inode = d_inode(dentry);
1827         int rc, i;
1828
1829         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1830                 return -EOPNOTSUPP;
1831
1832         acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT);
1833         if (!acls)
1834                 return -ENOENT;
1835         pace = acls->a_entries;
1836
1837         for (i = 0; i < acls->a_count; i++, pace++) {
1838                 if (pace->e_tag == ACL_MASK) {
1839                         pace->e_perm = 0x07;
1840                         break;
1841                 }
1842         }
1843
1844         rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1845         if (rc < 0)
1846                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1847                             rc);
1848         if (S_ISDIR(inode->i_mode)) {
1849                 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT,
1850                                    acls);
1851                 if (rc < 0)
1852                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1853                                     rc);
1854         }
1855         posix_acl_release(acls);
1856         return rc;
1857 }