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 *parent_path,
  67                                         struct path *path)
  68 {
  69         struct qstr last;
  70         struct filename *filename;
  71         struct path *root_share_path = &share_conf->vfs_path;
  72         int err, type;
  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         err = mnt_want_write(parent_path->mnt);
 101         if (err) {
 102                 path_put(parent_path);
 103                 putname(filename);
 104                 return -ENOENT;
 105         }
 106
 107         inode_lock_nested(parent_path->dentry->d_inode, I_MUTEX_PARENT);
 108         d = lookup_one_qstr_excl(&last, parent_path->dentry, 0);
 109         if (IS_ERR(d))
 110                 goto err_out;
 111
 112         if (d_is_negative(d)) {
 113                 dput(d);
 114                 goto err_out;
 115         }
 116
 117         path->dentry = d;
 118         path->mnt = mntget(parent_path->mnt);
 119
 120         if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) {
 121                 err = follow_down(path, 0);
 122                 if (err < 0) {
 123                         path_put(path);
 124                         goto err_out;
 125                 }
 126         }
 127
 128         putname(filename);
 129         return 0;
 130
 131 err_out:
 132         inode_unlock(d_inode(parent_path->dentry));
 133         mnt_drop_write(parent_path->mnt);
 134         path_put(parent_path);
 135         putname(filename);
 136         return -ENOENT;
 137 }
 138
 139 void ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap,
 140                                    struct dentry *dentry, __le32 *daccess)
 141 {
 142         *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
 143
 144         if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE))
 145                 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
 146                                 FILE_WRITE_DATA | FILE_APPEND_DATA |
 147                                 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
 148                                 FILE_DELETE_CHILD);
 149
 150         if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ))
 151                 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
 152
 153         if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC))
 154                 *daccess |= FILE_EXECUTE_LE;
 155
 156         if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE))
 157                 *daccess |= FILE_DELETE_LE;
 158 }
 159
 160 /**
 161  * ksmbd_vfs_create() - vfs helper for smb create file
 162  * @work:       work
 163  * @name:       file name that is relative to share
 164  * @mode:       file create mode
 165  *
 166  * Return:      0 on success, otherwise error
 167  */
 168 int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
 169 {
 170         struct path path;
 171         struct dentry *dentry;
 172         int err;
 173
 174         dentry = ksmbd_vfs_kern_path_create(work, name,
 175                                             LOOKUP_NO_SYMLINKS, &path);
 176         if (IS_ERR(dentry)) {
 177                 err = PTR_ERR(dentry);
 178                 if (err != -ENOENT)
 179                         pr_err("path create failed for %s, err %d\n",
 180                                name, err);
 181                 return err;
 182         }
 183
 184         mode |= S_IFREG;
 185         err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry),
 186                          dentry, mode, true);
 187         if (!err) {
 188                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
 189                                         d_inode(dentry));
 190         } else {
 191                 pr_err("File(%s): creation failed (err:%d)\n", name, err);
 192         }
 193
 194         done_path_create(&path, dentry);
 195         return err;
 196 }
 197
 198 /**
 199  * ksmbd_vfs_mkdir() - vfs helper for smb create directory
 200  * @work:       work
 201  * @name:       directory name that is relative to share
 202  * @mode:       directory create mode
 203  *
 204  * Return:      0 on success, otherwise error
 205  */
 206 int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
 207 {
 208         struct mnt_idmap *idmap;
 209         struct path path;
 210         struct dentry *dentry;
 211         int err;
 212
 213         dentry = ksmbd_vfs_kern_path_create(work, name,
 214                                             LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
 215                                             &path);
 216         if (IS_ERR(dentry)) {
 217                 err = PTR_ERR(dentry);
 218                 if (err != -EEXIST)
 219                         ksmbd_debug(VFS, "path create failed for %s, err %d\n",
 220                                     name, err);
 221                 return err;
 222         }
 223
 224         idmap = mnt_idmap(path.mnt);
 225         mode |= S_IFDIR;
 226         err = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode);
 227         if (!err && d_unhashed(dentry)) {
 228                 struct dentry *d;
 229
 230                 d = lookup_one(idmap, dentry->d_name.name, dentry->d_parent,
 231                                dentry->d_name.len);
 232                 if (IS_ERR(d)) {
 233                         err = PTR_ERR(d);
 234                         goto out_err;
 235                 }
 236                 if (unlikely(d_is_negative(d))) {
 237                         dput(d);
 238                         err = -ENOENT;
 239                         goto out_err;
 240                 }
 241
 242                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
 243                 dput(d);
 244         }
 245
 246 out_err:
 247         done_path_create(&path, dentry);
 248         if (err)
 249                 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err);
 250         return err;
 251 }
 252
 253 static ssize_t ksmbd_vfs_getcasexattr(struct mnt_idmap *idmap,
 254                                       struct dentry *dentry, char *attr_name,
 255                                       int attr_name_len, char **attr_value)
 256 {
 257         char *name, *xattr_list = NULL;
 258         ssize_t value_len = -ENOENT, xattr_list_len;
 259
 260         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
 261         if (xattr_list_len <= 0)
 262                 goto out;
 263
 264         for (name = xattr_list; name - xattr_list < xattr_list_len;
 265                         name += strlen(name) + 1) {
 266                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
 267                 if (strncasecmp(attr_name, name, attr_name_len))
 268                         continue;
 269
 270                 value_len = ksmbd_vfs_getxattr(idmap,
 271                                                dentry,
 272                                                name,
 273                                                attr_value);
 274                 if (value_len < 0)
 275                         pr_err("failed to get xattr in file\n");
 276                 break;
 277         }
 278
 279 out:
 280         kvfree(xattr_list);
 281         return value_len;
 282 }
 283
 284 static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
 285                                  size_t count)
 286 {
 287         ssize_t v_len;
 288         char *stream_buf = NULL;
 289
 290         ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
 291                     *pos, count);
 292
 293         v_len = ksmbd_vfs_getcasexattr(file_mnt_idmap(fp->filp),
 294                                        fp->filp->f_path.dentry,
 295                                        fp->stream.name,
 296                                        fp->stream.size,
 297                                        &stream_buf);
 298         if ((int)v_len <= 0)
 299                 return (int)v_len;
 300
 301         if (v_len <= *pos) {
 302                 count = -EINVAL;
 303                 goto free_buf;
 304         }
 305
 306         if (v_len - *pos < count)
 307                 count = v_len - *pos;
 308
 309         memcpy(buf, &stream_buf[*pos], count);
 310
 311 free_buf:
 312         kvfree(stream_buf);
 313         return count;
 314 }
 315
 316 /**
 317  * check_lock_range() - vfs helper for smb byte range file locking
 318  * @filp:       the file to apply the lock to
 319  * @start:      lock start byte offset
 320  * @end:        lock end byte offset
 321  * @type:       byte range type read/write
 322  *
 323  * Return:      0 on success, otherwise error
 324  */
 325 static int check_lock_range(struct file *filp, loff_t start, loff_t end,
 326                             unsigned char type)
 327 {
 328         struct file_lock *flock;
 329         struct file_lock_context *ctx = locks_inode_context(file_inode(filp));
 330         int error = 0;
 331
 332         if (!ctx || list_empty_careful(&ctx->flc_posix))
 333                 return 0;
 334
 335         spin_lock(&ctx->flc_lock);
 336         list_for_each_entry(flock, &ctx->flc_posix, fl_list) {
 337                 /* check conflict locks */
 338                 if (flock->fl_end >= start && end >= flock->fl_start) {
 339                         if (flock->fl_type == F_RDLCK) {
 340                                 if (type == WRITE) {
 341                                         pr_err("not allow write by shared lock\n");
 342                                         error = 1;
 343                                         goto out;
 344                                 }
 345                         } else if (flock->fl_type == F_WRLCK) {
 346                                 /* check owner in lock */
 347                                 if (flock->fl_file != filp) {
 348                                         error = 1;
 349                                         pr_err("not allow rw access by exclusive lock from other opens\n");
 350                                         goto out;
 351                                 }
 352                         }
 353                 }
 354         }
 355 out:
 356         spin_unlock(&ctx->flc_lock);
 357         return error;
 358 }
 359
 360 /**
 361  * ksmbd_vfs_read() - vfs helper for smb file read
 362  * @work:       smb work
 363  * @fid:        file id of open file
 364  * @count:      read byte count
 365  * @pos:        file pos
 366  * @rbuf:       read data buffer
 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, char *rbuf)
 372 {
 373         struct file *filp = fp->filp;
 374         ssize_t nbytes = 0;
 375         struct inode *inode = file_inode(filp);
 376
 377         if (S_ISDIR(inode->i_mode))
 378                 return -EISDIR;
 379
 380         if (unlikely(count == 0))
 381                 return 0;
 382
 383         if (work->conn->connection_type) {
 384                 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
 385                         pr_err("no right to read(%pD)\n", fp->filp);
 386                         return -EACCES;
 387                 }
 388         }
 389
 390         if (ksmbd_stream_fd(fp))
 391                 return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
 392
 393         if (!work->tcon->posix_extensions) {
 394                 int ret;
 395
 396                 ret = check_lock_range(filp, *pos, *pos + count - 1, READ);
 397                 if (ret) {
 398                         pr_err("unable to read due to lock\n");
 399                         return -EAGAIN;
 400                 }
 401         }
 402
 403         nbytes = kernel_read(filp, rbuf, count, pos);
 404         if (nbytes < 0) {
 405                 pr_err("smb read failed, err = %zd\n", nbytes);
 406                 return nbytes;
 407         }
 408
 409         filp->f_pos = *pos;
 410         return nbytes;
 411 }
 412
 413 static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
 414                                   size_t count)
 415 {
 416         char *stream_buf = NULL, *wbuf;
 417         struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
 418         size_t size;
 419         ssize_t 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 (v_len < 0) {
 437                 pr_err("not found stream in xattr : %zd\n", v_len);
 438                 err = v_len;
 439                 goto out;
 440         }
 441
 442         if (v_len < size) {
 443                 wbuf = kvzalloc(size, GFP_KERNEL);
 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                                  true);
 464         if (err < 0)
 465                 goto out;
 466
 467         fp->filp->f_pos = *pos;
 468         err = 0;
 469 out:
 470         kvfree(stream_buf);
 471         return err;
 472 }
 473
 474 /**
 475  * ksmbd_vfs_write() - vfs helper for smb file write
 476  * @work:       work
 477  * @fid:        file id of open file
 478  * @buf:        buf containing data for writing
 479  * @count:      read byte count
 480  * @pos:        file pos
 481  * @sync:       fsync after write
 482  * @written:    number of bytes written
 483  *
 484  * Return:      0 on success, otherwise error
 485  */
 486 int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
 487                     char *buf, size_t count, loff_t *pos, bool sync,
 488                     ssize_t *written)
 489 {
 490         struct file *filp;
 491         loff_t  offset = *pos;
 492         int err = 0;
 493
 494         if (work->conn->connection_type) {
 495                 if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
 496                         pr_err("no right to write(%pD)\n", fp->filp);
 497                         err = -EACCES;
 498                         goto out;
 499                 }
 500         }
 501
 502         filp = fp->filp;
 503
 504         if (ksmbd_stream_fd(fp)) {
 505                 err = ksmbd_vfs_stream_write(fp, buf, pos, count);
 506                 if (!err)
 507                         *written = count;
 508                 goto out;
 509         }
 510
 511         if (!work->tcon->posix_extensions) {
 512                 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
 513                 if (err) {
 514                         pr_err("unable to write due to lock\n");
 515                         err = -EAGAIN;
 516                         goto out;
 517                 }
 518         }
 519
 520         /* Do we need to break any of a levelII oplock? */
 521         smb_break_all_levII_oplock(work, fp, 1);
 522
 523         err = kernel_write(filp, buf, count, pos);
 524         if (err < 0) {
 525                 ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
 526                 goto out;
 527         }
 528
 529         filp->f_pos = *pos;
 530         *written = err;
 531         err = 0;
 532         if (sync) {
 533                 err = vfs_fsync_range(filp, offset, offset + *written, 0);
 534                 if (err < 0)
 535                         pr_err("fsync failed for filename = %pD, err = %d\n",
 536                                fp->filp, err);
 537         }
 538
 539 out:
 540         return err;
 541 }
 542
 543 /**
 544  * ksmbd_vfs_getattr() - vfs helper for smb getattr
 545  * @work:       work
 546  * @fid:        file id of open file
 547  * @attrs:      inode attributes
 548  *
 549  * Return:      0 on success, otherwise error
 550  */
 551 int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
 552 {
 553         int err;
 554
 555         err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
 556         if (err)
 557                 pr_err("getattr failed, err %d\n", err);
 558         return err;
 559 }
 560
 561 /**
 562  * ksmbd_vfs_fsync() - vfs helper for smb fsync
 563  * @work:       work
 564  * @fid:        file id of open file
 565  *
 566  * Return:      0 on success, otherwise error
 567  */
 568 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
 569 {
 570         struct ksmbd_file *fp;
 571         int err;
 572
 573         fp = ksmbd_lookup_fd_slow(work, fid, p_id);
 574         if (!fp) {
 575                 pr_err("failed to get filp for fid %llu\n", fid);
 576                 return -ENOENT;
 577         }
 578         err = vfs_fsync(fp->filp, 0);
 579         if (err < 0)
 580                 pr_err("smb fsync failed, err = %d\n", err);
 581         ksmbd_fd_put(work, fp);
 582         return err;
 583 }
 584
 585 /**
 586  * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
 587  * @name:       directory or file name that is relative to share
 588  *
 589  * Return:      0 on success, otherwise error
 590  */
 591 int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)
 592 {
 593         struct mnt_idmap *idmap;
 594         struct dentry *parent = path->dentry->d_parent;
 595         int err;
 596
 597         if (ksmbd_override_fsids(work))
 598                 return -ENOMEM;
 599
 600         if (!d_inode(path->dentry)->i_nlink) {
 601                 err = -ENOENT;
 602                 goto out_err;
 603         }
 604
 605         idmap = mnt_idmap(path->mnt);
 606         if (S_ISDIR(d_inode(path->dentry)->i_mode)) {
 607                 err = vfs_rmdir(idmap, d_inode(parent), path->dentry);
 608                 if (err && err != -ENOTEMPTY)
 609                         ksmbd_debug(VFS, "rmdir failed, err %d\n", err);
 610         } else {
 611                 err = vfs_unlink(idmap, d_inode(parent), path->dentry, NULL);
 612                 if (err)
 613                         ksmbd_debug(VFS, "unlink failed, err %d\n", err);
 614         }
 615
 616 out_err:
 617         ksmbd_revert_fsids(work);
 618         return err;
 619 }
 620
 621 /**
 622  * ksmbd_vfs_link() - vfs helper for creating smb hardlink
 623  * @oldname:    source file name
 624  * @newname:    hardlink name that is relative to share
 625  *
 626  * Return:      0 on success, otherwise error
 627  */
 628 int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
 629                    const char *newname)
 630 {
 631         struct path oldpath, newpath;
 632         struct dentry *dentry;
 633         int err;
 634
 635         if (ksmbd_override_fsids(work))
 636                 return -ENOMEM;
 637
 638         err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
 639         if (err) {
 640                 pr_err("cannot get linux path for %s, err = %d\n",
 641                        oldname, err);
 642                 goto out1;
 643         }
 644
 645         dentry = ksmbd_vfs_kern_path_create(work, newname,
 646                                             LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
 647                                             &newpath);
 648         if (IS_ERR(dentry)) {
 649                 err = PTR_ERR(dentry);
 650                 pr_err("path create err for %s, err %d\n", newname, err);
 651                 goto out2;
 652         }
 653
 654         err = -EXDEV;
 655         if (oldpath.mnt != newpath.mnt) {
 656                 pr_err("vfs_link failed err %d\n", err);
 657                 goto out3;
 658         }
 659
 660         err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt),
 661                        d_inode(newpath.dentry),
 662                        dentry, NULL);
 663         if (err)
 664                 ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
 665
 666 out3:
 667         done_path_create(&newpath, dentry);
 668 out2:
 669         path_put(&oldpath);
 670 out1:
 671         ksmbd_revert_fsids(work);
 672         return err;
 673 }
 674
 675 int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
 676                      char *newname, int flags)
 677 {
 678         struct dentry *old_parent, *new_dentry, *trap;
 679         struct dentry *old_child = old_path->dentry;
 680         struct path new_path;
 681         struct qstr new_last;
 682         struct renamedata rd;
 683         struct filename *to;
 684         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
 685         struct ksmbd_file *parent_fp;
 686         int new_type;
 687         int err, lookup_flags = LOOKUP_NO_SYMLINKS;
 688
 689         if (ksmbd_override_fsids(work))
 690                 return -ENOMEM;
 691
 692         to = getname_kernel(newname);
 693         if (IS_ERR(to)) {
 694                 err = PTR_ERR(to);
 695                 goto revert_fsids;
 696         }
 697
 698 retry:
 699         err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH,
 700                                      &new_path, &new_last, &new_type,
 701                                      &share_conf->vfs_path);
 702         if (err)
 703                 goto out1;
 704
 705         if (old_path->mnt != new_path.mnt) {
 706                 err = -EXDEV;
 707                 goto out2;
 708         }
 709
 710         err = mnt_want_write(old_path->mnt);
 711         if (err)
 712                 goto out2;
 713
 714         trap = lock_rename_child(old_child, new_path.dentry);
 715
 716         old_parent = dget(old_child->d_parent);
 717         if (d_unhashed(old_child)) {
 718                 err = -EINVAL;
 719                 goto out3;
 720         }
 721
 722         parent_fp = ksmbd_lookup_fd_inode(old_child->d_parent);
 723         if (parent_fp) {
 724                 if (parent_fp->daccess & FILE_DELETE_LE) {
 725                         pr_err("parent dir is opened with delete access\n");
 726                         err = -ESHARE;
 727                         ksmbd_fd_put(work, parent_fp);
 728                         goto out3;
 729                 }
 730                 ksmbd_fd_put(work, parent_fp);
 731         }
 732
 733         new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry,
 734                                           lookup_flags | LOOKUP_RENAME_TARGET);
 735         if (IS_ERR(new_dentry)) {
 736                 err = PTR_ERR(new_dentry);
 737                 goto out3;
 738         }
 739
 740         if (d_is_symlink(new_dentry)) {
 741                 err = -EACCES;
 742                 goto out4;
 743         }
 744
 745         if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) {
 746                 err = -EEXIST;
 747                 goto out4;
 748         }
 749
 750         if (old_child == trap) {
 751                 err = -EINVAL;
 752                 goto out4;
 753         }
 754
 755         if (new_dentry == trap) {
 756                 err = -ENOTEMPTY;
 757                 goto out4;
 758         }
 759
 760         rd.old_mnt_idmap        = mnt_idmap(old_path->mnt),
 761         rd.old_dir              = d_inode(old_parent),
 762         rd.old_dentry           = old_child,
 763         rd.new_mnt_idmap        = mnt_idmap(new_path.mnt),
 764         rd.new_dir              = new_path.dentry->d_inode,
 765         rd.new_dentry           = new_dentry,
 766         rd.flags                = flags,
 767         rd.delegated_inode      = NULL,
 768         err = vfs_rename(&rd);
 769         if (err)
 770                 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);
 771
 772 out4:
 773         dput(new_dentry);
 774 out3:
 775         dput(old_parent);
 776         unlock_rename(old_parent, new_path.dentry);
 777         mnt_drop_write(old_path->mnt);
 778 out2:
 779         path_put(&new_path);
 780
 781         if (retry_estale(err, lookup_flags)) {
 782                 lookup_flags |= LOOKUP_REVAL;
 783                 goto retry;
 784         }
 785 out1:
 786         putname(to);
 787 revert_fsids:
 788         ksmbd_revert_fsids(work);
 789         return err;
 790 }
 791
 792 /**
 793  * ksmbd_vfs_truncate() - vfs helper for smb file truncate
 794  * @work:       work
 795  * @fid:        file id of old file
 796  * @size:       truncate to given size
 797  *
 798  * Return:      0 on success, otherwise error
 799  */
 800 int ksmbd_vfs_truncate(struct ksmbd_work *work,
 801                        struct ksmbd_file *fp, loff_t size)
 802 {
 803         int err = 0;
 804         struct file *filp;
 805
 806         filp = fp->filp;
 807
 808         /* Do we need to break any of a levelII oplock? */
 809         smb_break_all_levII_oplock(work, fp, 1);
 810
 811         if (!work->tcon->posix_extensions) {
 812                 struct inode *inode = file_inode(filp);
 813
 814                 if (size < inode->i_size) {
 815                         err = check_lock_range(filp, size,
 816                                                inode->i_size - 1, WRITE);
 817                 } else {
 818                         err = check_lock_range(filp, inode->i_size,
 819                                                size - 1, WRITE);
 820                 }
 821
 822                 if (err) {
 823                         pr_err("failed due to lock\n");
 824                         return -EAGAIN;
 825                 }
 826         }
 827
 828         err = vfs_truncate(&filp->f_path, size);
 829         if (err)
 830                 pr_err("truncate failed, err %d\n", err);
 831         return err;
 832 }
 833
 834 /**
 835  * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
 836  * @dentry:     dentry of file for listing xattrs
 837  * @list:       destination buffer
 838  * @size:       destination buffer length
 839  *
 840  * Return:      xattr list length on success, otherwise error
 841  */
 842 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
 843 {
 844         ssize_t size;
 845         char *vlist = NULL;
 846
 847         size = vfs_listxattr(dentry, NULL, 0);
 848         if (size <= 0)
 849                 return size;
 850
 851         vlist = kvzalloc(size, GFP_KERNEL);
 852         if (!vlist)
 853                 return -ENOMEM;
 854
 855         *list = vlist;
 856         size = vfs_listxattr(dentry, vlist, size);
 857         if (size < 0) {
 858                 ksmbd_debug(VFS, "listxattr failed\n");
 859                 kvfree(vlist);
 860                 *list = NULL;
 861         }
 862
 863         return size;
 864 }
 865
 866 static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap,
 867                                    struct dentry *dentry, char *xattr_name)
 868 {
 869         return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0);
 870 }
 871
 872 /**
 873  * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
 874  * @idmap:      idmap
 875  * @dentry:     dentry of file for getting xattrs
 876  * @xattr_name: name of xattr name to query
 877  * @xattr_buf:  destination buffer xattr value
 878  *
 879  * Return:      read xattr value length on success, otherwise error
 880  */
 881 ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap,
 882                            struct dentry *dentry,
 883                            char *xattr_name, char **xattr_buf)
 884 {
 885         ssize_t xattr_len;
 886         char *buf;
 887
 888         *xattr_buf = NULL;
 889         xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name);
 890         if (xattr_len < 0)
 891                 return xattr_len;
 892
 893         buf = kmalloc(xattr_len + 1, GFP_KERNEL);
 894         if (!buf)
 895                 return -ENOMEM;
 896
 897         xattr_len = vfs_getxattr(idmap, dentry, xattr_name,
 898                                  (void *)buf, xattr_len);
 899         if (xattr_len > 0)
 900                 *xattr_buf = buf;
 901         else
 902                 kfree(buf);
 903         return xattr_len;
 904 }
 905
 906 /**
 907  * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
 908  * @idmap:      idmap of the relevant mount
 909  * @path:       path of dentry to set XATTR at
 910  * @attr_name:  xattr name for setxattr
 911  * @attr_value: xattr value to set
 912  * @attr_size:  size of xattr value
 913  * @flags:      destination buffer length
 914  * @get_write:  get write access to a mount
 915  *
 916  * Return:      0 on success, otherwise error
 917  */
 918 int ksmbd_vfs_setxattr(struct mnt_idmap *idmap,
 919                        const struct path *path, const char *attr_name,
 920                        void *attr_value, size_t attr_size, int flags,
 921                        bool get_write)
 922 {
 923         int err;
 924
 925         if (get_write == true) {
 926                 err = mnt_want_write(path->mnt);
 927                 if (err)
 928                         return err;
 929         }
 930
 931         err = vfs_setxattr(idmap,
 932                            path->dentry,
 933                            attr_name,
 934                            attr_value,
 935                            attr_size,
 936                            flags);
 937         if (err)
 938                 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
 939         if (get_write == true)
 940                 mnt_drop_write(path->mnt);
 941         return err;
 942 }
 943
 944 /**
 945  * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
 946  * @filp:       file pointer for IO
 947  * @options:    smb IO options
 948  */
 949 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
 950 {
 951         struct address_space *mapping;
 952
 953         mapping = filp->f_mapping;
 954
 955         if (!option || !mapping)
 956                 return;
 957
 958         if (option & FILE_WRITE_THROUGH_LE) {
 959                 filp->f_flags |= O_SYNC;
 960         } else if (option & FILE_SEQUENTIAL_ONLY_LE) {
 961                 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
 962                 spin_lock(&filp->f_lock);
 963                 filp->f_mode &= ~FMODE_RANDOM;
 964                 spin_unlock(&filp->f_lock);
 965         } else if (option & FILE_RANDOM_ACCESS_LE) {
 966                 spin_lock(&filp->f_lock);
 967                 filp->f_mode |= FMODE_RANDOM;
 968                 spin_unlock(&filp->f_lock);
 969         }
 970 }
 971
 972 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
 973                         loff_t off, loff_t len)
 974 {
 975         smb_break_all_levII_oplock(work, fp, 1);
 976         if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
 977                 return vfs_fallocate(fp->filp,
 978                                      FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
 979                                      off, len);
 980
 981         return vfs_fallocate(fp->filp,
 982                              FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
 983                              off, len);
 984 }
 985
 986 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
 987                          struct file_allocated_range_buffer *ranges,
 988                          unsigned int in_count, unsigned int *out_count)
 989 {
 990         struct file *f = fp->filp;
 991         struct inode *inode = file_inode(fp->filp);
 992         loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
 993         loff_t extent_start, extent_end;
 994         int ret = 0;
 995
 996         if (start > maxbytes)
 997                 return -EFBIG;
 998
 999         if (!in_count)
1000                 return 0;
1001
1002         /*
1003          * Shrink request scope to what the fs can actually handle.
1004          */
1005         if (length > maxbytes || (maxbytes - length) < start)
1006                 length = maxbytes - start;
1007
1008         if (start + length > inode->i_size)
1009                 length = inode->i_size - start;
1010
1011         *out_count = 0;
1012         end = start + length;
1013         while (start < end && *out_count < in_count) {
1014                 extent_start = vfs_llseek(f, start, SEEK_DATA);
1015                 if (extent_start < 0) {
1016                         if (extent_start != -ENXIO)
1017                                 ret = (int)extent_start;
1018                         break;
1019                 }
1020
1021                 if (extent_start >= end)
1022                         break;
1023
1024                 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
1025                 if (extent_end < 0) {
1026                         if (extent_end != -ENXIO)
1027                                 ret = (int)extent_end;
1028                         break;
1029                 } else if (extent_start >= extent_end) {
1030                         break;
1031                 }
1032
1033                 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1034                 ranges[(*out_count)++].length =
1035                         cpu_to_le64(min(extent_end, end) - extent_start);
1036
1037                 start = extent_end;
1038         }
1039
1040         return ret;
1041 }
1042
1043 int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap,
1044                            const struct path *path, char *attr_name)
1045 {
1046         int err;
1047
1048         err = mnt_want_write(path->mnt);
1049         if (err)
1050                 return err;
1051
1052         err = vfs_removexattr(idmap, path->dentry, attr_name);
1053         mnt_drop_write(path->mnt);
1054
1055         return err;
1056 }
1057
1058 int ksmbd_vfs_unlink(struct file *filp)
1059 {
1060         int err = 0;
1061         struct dentry *dir, *dentry = filp->f_path.dentry;
1062         struct mnt_idmap *idmap = file_mnt_idmap(filp);
1063
1064         err = mnt_want_write(filp->f_path.mnt);
1065         if (err)
1066                 return err;
1067
1068         dir = dget_parent(dentry);
1069         err = ksmbd_vfs_lock_parent(dir, dentry);
1070         if (err)
1071                 goto out;
1072         dget(dentry);
1073
1074         if (S_ISDIR(d_inode(dentry)->i_mode))
1075                 err = vfs_rmdir(idmap, d_inode(dir), dentry);
1076         else
1077                 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL);
1078
1079         dput(dentry);
1080         inode_unlock(d_inode(dir));
1081         if (err)
1082                 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1083 out:
1084         dput(dir);
1085         mnt_drop_write(filp->f_path.mnt);
1086
1087         return err;
1088 }
1089
1090 static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1091                        loff_t offset, u64 ino, unsigned int d_type)
1092 {
1093         struct ksmbd_readdir_data *buf;
1094
1095         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1096         buf->dirent_count++;
1097
1098         return buf->dirent_count <= 2;
1099 }
1100
1101 /**
1102  * ksmbd_vfs_empty_dir() - check for empty directory
1103  * @fp: ksmbd file pointer
1104  *
1105  * Return:      true if directory empty, otherwise false
1106  */
1107 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1108 {
1109         int err;
1110         struct ksmbd_readdir_data readdir_data;
1111
1112         memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1113
1114         set_ctx_actor(&readdir_data.ctx, __dir_empty);
1115         readdir_data.dirent_count = 0;
1116
1117         err = iterate_dir(fp->filp, &readdir_data.ctx);
1118         if (readdir_data.dirent_count > 2)
1119                 err = -ENOTEMPTY;
1120         else
1121                 err = 0;
1122         return err;
1123 }
1124
1125 static bool __caseless_lookup(struct dir_context *ctx, const char *name,
1126                              int namlen, loff_t offset, u64 ino,
1127                              unsigned int d_type)
1128 {
1129         struct ksmbd_readdir_data *buf;
1130         int cmp = -EINVAL;
1131
1132         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1133
1134         if (buf->used != namlen)
1135                 return true;
1136         if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
1137                 const struct qstr q_buf = {.name = buf->private,
1138                                            .len = buf->used};
1139                 const struct qstr q_name = {.name = name,
1140                                             .len = namlen};
1141
1142                 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
1143         }
1144         if (cmp < 0)
1145                 cmp = strncasecmp((char *)buf->private, name, namlen);
1146         if (!cmp) {
1147                 memcpy((char *)buf->private, name, namlen);
1148                 buf->dirent_count = 1;
1149                 return false;
1150         }
1151         return true;
1152 }
1153
1154 /**
1155  * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1156  * @dir:        path info
1157  * @name:       filename to lookup
1158  * @namelen:    filename length
1159  *
1160  * Return:      0 on success, otherwise error
1161  */
1162 static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
1163                                    size_t namelen, struct unicode_map *um)
1164 {
1165         int ret;
1166         struct file *dfilp;
1167         int flags = O_RDONLY | O_LARGEFILE;
1168         struct ksmbd_readdir_data readdir_data = {
1169                 .ctx.actor      = __caseless_lookup,
1170                 .private        = name,
1171                 .used           = namelen,
1172                 .dirent_count   = 0,
1173                 .um             = um,
1174         };
1175
1176         dfilp = dentry_open(dir, flags, current_cred());
1177         if (IS_ERR(dfilp))
1178                 return PTR_ERR(dfilp);
1179
1180         ret = iterate_dir(dfilp, &readdir_data.ctx);
1181         if (readdir_data.dirent_count > 0)
1182                 ret = 0;
1183         fput(dfilp);
1184         return ret;
1185 }
1186
1187 /**
1188  * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
1189  * @name:               file path that is relative to share
1190  * @flags:              lookup flags
1191  * @parent_path:        if lookup succeed, return parent_path info
1192  * @path:               if lookup succeed, return path info
1193  * @caseless:   caseless filename lookup
1194  *
1195  * Return:      0 on success, otherwise error
1196  */
1197 int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
1198                                unsigned int flags, struct path *parent_path,
1199                                struct path *path, bool caseless)
1200 {
1201         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1202         int err;
1203
1204         err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path,
1205                                            path);
1206         if (!err)
1207                 return 0;
1208
1209         if (caseless) {
1210                 char *filepath;
1211                 size_t path_len, remain_len;
1212
1213                 filepath = kstrdup(name, GFP_KERNEL);
1214                 if (!filepath)
1215                         return -ENOMEM;
1216
1217                 path_len = strlen(filepath);
1218                 remain_len = path_len;
1219
1220                 *parent_path = share_conf->vfs_path;
1221                 path_get(parent_path);
1222
1223                 while (d_can_lookup(parent_path->dentry)) {
1224                         char *filename = filepath + path_len - remain_len;
1225                         char *next = strchrnul(filename, '/');
1226                         size_t filename_len = next - filename;
1227                         bool is_last = !next[0];
1228
1229                         if (filename_len == 0)
1230                                 break;
1231
1232                         err = ksmbd_vfs_lookup_in_dir(parent_path, filename,
1233                                                       filename_len,
1234                                                       work->conn->um);
1235                         if (err)
1236                                 goto out2;
1237
1238                         next[0] = '\0';
1239
1240                         err = vfs_path_lookup(share_conf->vfs_path.dentry,
1241                                               share_conf->vfs_path.mnt,
1242                                               filepath,
1243                                               flags,
1244                                               path);
1245                         if (err)
1246                                 goto out2;
1247                         else if (is_last)
1248                                 goto out1;
1249                         path_put(parent_path);
1250                         *parent_path = *path;
1251
1252                         next[0] = '/';
1253                         remain_len -= filename_len + 1;
1254                 }
1255
1256                 err = -EINVAL;
1257 out2:
1258                 path_put(parent_path);
1259 out1:
1260                 kfree(filepath);
1261         }
1262
1263         if (!err) {
1264                 err = mnt_want_write(parent_path->mnt);
1265                 if (err) {
1266                         path_put(path);
1267                         path_put(parent_path);
1268                         return err;
1269                 }
1270
1271                 err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry);
1272                 if (err) {
1273                         path_put(path);
1274                         path_put(parent_path);
1275                 }
1276         }
1277         return err;
1278 }
1279
1280 void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path)
1281 {
1282         inode_unlock(d_inode(parent_path->dentry));
1283         mnt_drop_write(parent_path->mnt);
1284         path_put(path);
1285         path_put(parent_path);
1286 }
1287
1288 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1289                                           const char *name,
1290                                           unsigned int flags,
1291                                           struct path *path)
1292 {
1293         char *abs_name;
1294         struct dentry *dent;
1295
1296         abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1297         if (!abs_name)
1298                 return ERR_PTR(-ENOMEM);
1299
1300         dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1301         kfree(abs_name);
1302         return dent;
1303 }
1304
1305 int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap,
1306                                 const struct path *path)
1307 {
1308         char *name, *xattr_list = NULL;
1309         ssize_t xattr_list_len;
1310         int err = 0;
1311
1312         xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1313         if (xattr_list_len < 0) {
1314                 goto out;
1315         } else if (!xattr_list_len) {
1316                 ksmbd_debug(SMB, "empty xattr in the file\n");
1317                 goto out;
1318         }
1319
1320         err = mnt_want_write(path->mnt);
1321         if (err)
1322                 goto out;
1323
1324         for (name = xattr_list; name - xattr_list < xattr_list_len;
1325              name += strlen(name) + 1) {
1326                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1327
1328                 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1329                              sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1330                     !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1331                              sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1332                         err = vfs_remove_acl(idmap, path->dentry, name);
1333                         if (err)
1334                                 ksmbd_debug(SMB,
1335                                             "remove acl xattr failed : %s\n", name);
1336                 }
1337         }
1338         mnt_drop_write(path->mnt);
1339
1340 out:
1341         kvfree(xattr_list);
1342         return err;
1343 }
1344
1345 int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path)
1346 {
1347         char *name, *xattr_list = NULL;
1348         ssize_t xattr_list_len;
1349         int err = 0;
1350
1351         xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1352         if (xattr_list_len < 0) {
1353                 goto out;
1354         } else if (!xattr_list_len) {
1355                 ksmbd_debug(SMB, "empty xattr in the file\n");
1356                 goto out;
1357         }
1358
1359         for (name = xattr_list; name - xattr_list < xattr_list_len;
1360                         name += strlen(name) + 1) {
1361                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1362
1363                 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1364                         err = ksmbd_vfs_remove_xattr(idmap, path, name);
1365                         if (err)
1366                                 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1367                 }
1368         }
1369 out:
1370         kvfree(xattr_list);
1371         return err;
1372 }
1373
1374 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap,
1375                                                             struct inode *inode,
1376                                                             int acl_type)
1377 {
1378         struct xattr_smb_acl *smb_acl = NULL;
1379         struct posix_acl *posix_acls;
1380         struct posix_acl_entry *pa_entry;
1381         struct xattr_acl_entry *xa_entry;
1382         int i;
1383
1384         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1385                 return NULL;
1386
1387         posix_acls = get_inode_acl(inode, acl_type);
1388         if (IS_ERR_OR_NULL(posix_acls))
1389                 return NULL;
1390
1391         smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1392                           sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1393                           GFP_KERNEL);
1394         if (!smb_acl)
1395                 goto out;
1396
1397         smb_acl->count = posix_acls->a_count;
1398         pa_entry = posix_acls->a_entries;
1399         xa_entry = smb_acl->entries;
1400         for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1401                 switch (pa_entry->e_tag) {
1402                 case ACL_USER:
1403                         xa_entry->type = SMB_ACL_USER;
1404                         xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry);
1405                         break;
1406                 case ACL_USER_OBJ:
1407                         xa_entry->type = SMB_ACL_USER_OBJ;
1408                         break;
1409                 case ACL_GROUP:
1410                         xa_entry->type = SMB_ACL_GROUP;
1411                         xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry);
1412                         break;
1413                 case ACL_GROUP_OBJ:
1414                         xa_entry->type = SMB_ACL_GROUP_OBJ;
1415                         break;
1416                 case ACL_OTHER:
1417                         xa_entry->type = SMB_ACL_OTHER;
1418                         break;
1419                 case ACL_MASK:
1420                         xa_entry->type = SMB_ACL_MASK;
1421                         break;
1422                 default:
1423                         pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1424                         goto out;
1425                 }
1426
1427                 if (pa_entry->e_perm & ACL_READ)
1428                         xa_entry->perm |= SMB_ACL_READ;
1429                 if (pa_entry->e_perm & ACL_WRITE)
1430                         xa_entry->perm |= SMB_ACL_WRITE;
1431                 if (pa_entry->e_perm & ACL_EXECUTE)
1432                         xa_entry->perm |= SMB_ACL_EXECUTE;
1433         }
1434 out:
1435         posix_acl_release(posix_acls);
1436         return smb_acl;
1437 }
1438
1439 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1440                            struct mnt_idmap *idmap,
1441                            const struct path *path,
1442                            struct smb_ntsd *pntsd, int len,
1443                            bool get_write)
1444 {
1445         int rc;
1446         struct ndr sd_ndr = {0}, acl_ndr = {0};
1447         struct xattr_ntacl acl = {0};
1448         struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1449         struct dentry *dentry = path->dentry;
1450         struct inode *inode = d_inode(dentry);
1451
1452         acl.version = 4;
1453         acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1454         acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1455
1456         memcpy(acl.desc, "posix_acl", 9);
1457         acl.desc_len = 10;
1458
1459         pntsd->osidoffset =
1460                 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1461         pntsd->gsidoffset =
1462                 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1463         pntsd->dacloffset =
1464                 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1465
1466         acl.sd_buf = (char *)pntsd;
1467         acl.sd_size = len;
1468
1469         rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1470         if (rc) {
1471                 pr_err("failed to generate hash for ndr acl\n");
1472                 return rc;
1473         }
1474
1475         smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1476                                                  ACL_TYPE_ACCESS);
1477         if (S_ISDIR(inode->i_mode))
1478                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1479                                                              ACL_TYPE_DEFAULT);
1480
1481         rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode,
1482                                   smb_acl, def_smb_acl);
1483         if (rc) {
1484                 pr_err("failed to encode ndr to posix acl\n");
1485                 goto out;
1486         }
1487
1488         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1489                                acl.posix_acl_hash);
1490         if (rc) {
1491                 pr_err("failed to generate hash for ndr acl\n");
1492                 goto out;
1493         }
1494
1495         rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1496         if (rc) {
1497                 pr_err("failed to encode ndr to posix acl\n");
1498                 goto out;
1499         }
1500
1501         rc = ksmbd_vfs_setxattr(idmap, path,
1502                                 XATTR_NAME_SD, sd_ndr.data,
1503                                 sd_ndr.offset, 0, get_write);
1504         if (rc < 0)
1505                 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1506
1507         kfree(sd_ndr.data);
1508 out:
1509         kfree(acl_ndr.data);
1510         kfree(smb_acl);
1511         kfree(def_smb_acl);
1512         return rc;
1513 }
1514
1515 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1516                            struct mnt_idmap *idmap,
1517                            struct dentry *dentry,
1518                            struct smb_ntsd **pntsd)
1519 {
1520         int rc;
1521         struct ndr n;
1522         struct inode *inode = d_inode(dentry);
1523         struct ndr acl_ndr = {0};
1524         struct xattr_ntacl acl;
1525         struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1526         __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1527
1528         rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data);
1529         if (rc <= 0)
1530                 return rc;
1531
1532         n.length = rc;
1533         rc = ndr_decode_v4_ntacl(&n, &acl);
1534         if (rc)
1535                 goto free_n_data;
1536
1537         smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1538                                                  ACL_TYPE_ACCESS);
1539         if (S_ISDIR(inode->i_mode))
1540                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1541                                                              ACL_TYPE_DEFAULT);
1542
1543         rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl,
1544                                   def_smb_acl);
1545         if (rc) {
1546                 pr_err("failed to encode ndr to posix acl\n");
1547                 goto out_free;
1548         }
1549
1550         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1551         if (rc) {
1552                 pr_err("failed to generate hash for ndr acl\n");
1553                 goto out_free;
1554         }
1555
1556         if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1557                 pr_err("hash value diff\n");
1558                 rc = -EINVAL;
1559                 goto out_free;
1560         }
1561
1562         *pntsd = acl.sd_buf;
1563         if (acl.sd_size < sizeof(struct smb_ntsd)) {
1564                 pr_err("sd size is invalid\n");
1565                 goto out_free;
1566         }
1567
1568         (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1569                                            NDR_NTSD_OFFSETOF);
1570         (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1571                                            NDR_NTSD_OFFSETOF);
1572         (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1573                                            NDR_NTSD_OFFSETOF);
1574
1575         rc = acl.sd_size;
1576 out_free:
1577         kfree(acl_ndr.data);
1578         kfree(smb_acl);
1579         kfree(def_smb_acl);
1580         if (rc < 0) {
1581                 kfree(acl.sd_buf);
1582                 *pntsd = NULL;
1583         }
1584
1585 free_n_data:
1586         kfree(n.data);
1587         return rc;
1588 }
1589
1590 int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap,
1591                                    const struct path *path,
1592                                    struct xattr_dos_attrib *da,
1593                                    bool get_write)
1594 {
1595         struct ndr n;
1596         int err;
1597
1598         err = ndr_encode_dos_attr(&n, da);
1599         if (err)
1600                 return err;
1601
1602         err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE,
1603                                  (void *)n.data, n.offset, 0, get_write);
1604         if (err)
1605                 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1606         kfree(n.data);
1607
1608         return err;
1609 }
1610
1611 int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap,
1612                                    struct dentry *dentry,
1613                                    struct xattr_dos_attrib *da)
1614 {
1615         struct ndr n;
1616         int err;
1617
1618         err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1619                                  (char **)&n.data);
1620         if (err > 0) {
1621                 n.length = err;
1622                 if (ndr_decode_dos_attr(&n, da))
1623                         err = -EINVAL;
1624                 kfree(n.data);
1625         } else {
1626                 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1627         }
1628
1629         return err;
1630 }
1631
1632 /**
1633  * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1634  * @p:          destination buffer
1635  * @ksmbd_kstat:      ksmbd kstat wrapper
1636  */
1637 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1638 {
1639         struct file_directory_info *info = (struct file_directory_info *)(*p);
1640         struct kstat *kstat = ksmbd_kstat->kstat;
1641         u64 time;
1642
1643         info->FileIndex = 0;
1644         info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1645         time = ksmbd_UnixTimeToNT(kstat->atime);
1646         info->LastAccessTime = cpu_to_le64(time);
1647         time = ksmbd_UnixTimeToNT(kstat->mtime);
1648         info->LastWriteTime = cpu_to_le64(time);
1649         time = ksmbd_UnixTimeToNT(kstat->ctime);
1650         info->ChangeTime = cpu_to_le64(time);
1651
1652         if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1653                 info->EndOfFile = 0;
1654                 info->AllocationSize = 0;
1655         } else {
1656                 info->EndOfFile = cpu_to_le64(kstat->size);
1657                 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1658         }
1659         info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1660
1661         return info;
1662 }
1663
1664 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1665                                 struct mnt_idmap *idmap,
1666                                 struct dentry *dentry,
1667                                 struct ksmbd_kstat *ksmbd_kstat)
1668 {
1669         u64 time;
1670         int rc;
1671
1672         generic_fillattr(idmap, STATX_BASIC_STATS, d_inode(dentry),
1673                          ksmbd_kstat->kstat);
1674
1675         time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1676         ksmbd_kstat->create_time = time;
1677
1678         /*
1679          * set default value for the case that store dos attributes is not yes
1680          * or that acl is disable in server's filesystem and the config is yes.
1681          */
1682         if (S_ISDIR(ksmbd_kstat->kstat->mode))
1683                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1684         else
1685                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1686
1687         if (test_share_config_flag(work->tcon->share_conf,
1688                                    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1689                 struct xattr_dos_attrib da;
1690
1691                 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
1692                 if (rc > 0) {
1693                         ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1694                         ksmbd_kstat->create_time = da.create_time;
1695                 } else {
1696                         ksmbd_debug(VFS, "fail to load dos attribute.\n");
1697                 }
1698         }
1699
1700         return 0;
1701 }
1702
1703 ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap,
1704                                 struct dentry *dentry, char *attr_name,
1705                                 int attr_name_len)
1706 {
1707         char *name, *xattr_list = NULL;
1708         ssize_t value_len = -ENOENT, xattr_list_len;
1709
1710         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1711         if (xattr_list_len <= 0)
1712                 goto out;
1713
1714         for (name = xattr_list; name - xattr_list < xattr_list_len;
1715                         name += strlen(name) + 1) {
1716                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1717                 if (strncasecmp(attr_name, name, attr_name_len))
1718                         continue;
1719
1720                 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name);
1721                 break;
1722         }
1723
1724 out:
1725         kvfree(xattr_list);
1726         return value_len;
1727 }
1728
1729 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1730                                 size_t *xattr_stream_name_size, int s_type)
1731 {
1732         char *type, *buf;
1733
1734         if (s_type == DIR_STREAM)
1735                 type = ":$INDEX_ALLOCATION";
1736         else
1737                 type = ":$DATA";
1738
1739         buf = kasprintf(GFP_KERNEL, "%s%s%s",
1740                         XATTR_NAME_STREAM, stream_name, type);
1741         if (!buf)
1742                 return -ENOMEM;
1743
1744         *xattr_stream_name = buf;
1745         *xattr_stream_name_size = strlen(buf) + 1;
1746
1747         return 0;
1748 }
1749
1750 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1751                                struct ksmbd_file *src_fp,
1752                                struct ksmbd_file *dst_fp,
1753                                struct srv_copychunk *chunks,
1754                                unsigned int chunk_count,
1755                                unsigned int *chunk_count_written,
1756                                unsigned int *chunk_size_written,
1757                                loff_t *total_size_written)
1758 {
1759         unsigned int i;
1760         loff_t src_off, dst_off, src_file_size;
1761         size_t len;
1762         int ret;
1763
1764         *chunk_count_written = 0;
1765         *chunk_size_written = 0;
1766         *total_size_written = 0;
1767
1768         if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1769                 pr_err("no right to read(%pD)\n", src_fp->filp);
1770                 return -EACCES;
1771         }
1772         if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1773                 pr_err("no right to write(%pD)\n", dst_fp->filp);
1774                 return -EACCES;
1775         }
1776
1777         if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1778                 return -EBADF;
1779
1780         smb_break_all_levII_oplock(work, dst_fp, 1);
1781
1782         if (!work->tcon->posix_extensions) {
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 (check_lock_range(src_fp->filp, src_off,
1789                                              src_off + len - 1, READ))
1790                                 return -EAGAIN;
1791                         if (check_lock_range(dst_fp->filp, dst_off,
1792                                              dst_off + len - 1, WRITE))
1793                                 return -EAGAIN;
1794                 }
1795         }
1796
1797         src_file_size = i_size_read(file_inode(src_fp->filp));
1798
1799         for (i = 0; i < chunk_count; i++) {
1800                 src_off = le64_to_cpu(chunks[i].SourceOffset);
1801                 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1802                 len = le32_to_cpu(chunks[i].Length);
1803
1804                 if (src_off + len > src_file_size)
1805                         return -E2BIG;
1806
1807                 ret = vfs_copy_file_range(src_fp->filp, src_off,
1808                                           dst_fp->filp, dst_off, len, 0);
1809                 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1810                         ret = vfs_copy_file_range(src_fp->filp, src_off,
1811                                                   dst_fp->filp, dst_off, len,
1812                                                   COPY_FILE_SPLICE);
1813                 if (ret < 0)
1814                         return ret;
1815
1816                 *chunk_count_written += 1;
1817                 *total_size_written += ret;
1818         }
1819         return 0;
1820 }
1821
1822 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1823 {
1824         wait_event(flock->fl_wait, !flock->fl_blocker);
1825 }
1826
1827 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1828 {
1829         return wait_event_interruptible_timeout(flock->fl_wait,
1830                                                 !flock->fl_blocker,
1831                                                 timeout);
1832 }
1833
1834 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1835 {
1836         locks_delete_block(flock);
1837 }
1838
1839 int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
1840                                  struct path *path)
1841 {
1842         struct posix_acl_state acl_state;
1843         struct posix_acl *acls;
1844         struct dentry *dentry = path->dentry;
1845         struct inode *inode = d_inode(dentry);
1846         int rc;
1847
1848         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1849                 return -EOPNOTSUPP;
1850
1851         ksmbd_debug(SMB, "Set posix acls\n");
1852         rc = init_acl_state(&acl_state, 1);
1853         if (rc)
1854                 return rc;
1855
1856         /* Set default owner group */
1857         acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1858         acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1859         acl_state.other.allow = inode->i_mode & 0007;
1860         acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1861         acl_state.users->aces[acl_state.users->n++].perms.allow =
1862                 acl_state.owner.allow;
1863         acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1864         acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1865                 acl_state.group.allow;
1866         acl_state.mask.allow = 0x07;
1867
1868         acls = posix_acl_alloc(6, GFP_KERNEL);
1869         if (!acls) {
1870                 free_acl_state(&acl_state);
1871                 return -ENOMEM;
1872         }
1873         posix_state_to_acl(&acl_state, acls->a_entries);
1874
1875         rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1876         if (rc < 0)
1877                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1878                             rc);
1879         else if (S_ISDIR(inode->i_mode)) {
1880                 posix_state_to_acl(&acl_state, acls->a_entries);
1881                 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls);
1882                 if (rc < 0)
1883                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1884                                     rc);
1885         }
1886
1887         free_acl_state(&acl_state);
1888         posix_acl_release(acls);
1889         return rc;
1890 }
1891
1892 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
1893                                 struct path *path, struct inode *parent_inode)
1894 {
1895         struct posix_acl *acls;
1896         struct posix_acl_entry *pace;
1897         struct dentry *dentry = path->dentry;
1898         struct inode *inode = d_inode(dentry);
1899         int rc, i;
1900
1901         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1902                 return -EOPNOTSUPP;
1903
1904         acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT);
1905         if (IS_ERR_OR_NULL(acls))
1906                 return -ENOENT;
1907         pace = acls->a_entries;
1908
1909         for (i = 0; i < acls->a_count; i++, pace++) {
1910                 if (pace->e_tag == ACL_MASK) {
1911                         pace->e_perm = 0x07;
1912                         break;
1913                 }
1914         }
1915
1916         rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1917         if (rc < 0)
1918                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1919                             rc);
1920         if (S_ISDIR(inode->i_mode)) {
1921                 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT,
1922                                    acls);
1923                 if (rc < 0)
1924                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1925                                     rc);
1926         }
1927
1928         posix_acl_release(acls);
1929         return rc;
1930 }