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  * @parent: parent dentry
  53  * @child: child dentry
  54  *
  55  * Returns: %0 on success, %-ENOENT if the parent dentry is not stable
  56  */
  57 int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child)
  58 {
  59         inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
  60         if (child->d_parent != parent) {
  61                 inode_unlock(d_inode(parent));
  62                 return -ENOENT;
  63         }
  64
  65         return 0;
  66 }
  67
  68 static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf,
  69                                         char *pathname, unsigned int flags,
  70                                         struct path *parent_path,
  71                                         struct path *path)
  72 {
  73         struct qstr last;
  74         struct filename *filename;
  75         struct path *root_share_path = &share_conf->vfs_path;
  76         int err, type;
  77         struct dentry *d;
  78
  79         if (pathname[0] == '\0') {
  80                 pathname = share_conf->path;
  81                 root_share_path = NULL;
  82         } else {
  83                 flags |= LOOKUP_BENEATH;
  84         }
  85
  86         filename = getname_kernel(pathname);
  87         if (IS_ERR(filename))
  88                 return PTR_ERR(filename);
  89
  90         err = vfs_path_parent_lookup(filename, flags,
  91                                      parent_path, &last, &type,
  92                                      root_share_path);
  93         if (err) {
  94                 putname(filename);
  95                 return err;
  96         }
  97
  98         if (unlikely(type != LAST_NORM)) {
  99                 path_put(parent_path);
 100                 putname(filename);
 101                 return -ENOENT;
 102         }
 103
 104         err = mnt_want_write(parent_path->mnt);
 105         if (err) {
 106                 path_put(parent_path);
 107                 putname(filename);
 108                 return -ENOENT;
 109         }
 110
 111         inode_lock_nested(parent_path->dentry->d_inode, I_MUTEX_PARENT);
 112         d = lookup_one_qstr_excl(&last, parent_path->dentry, 0);
 113         if (IS_ERR(d))
 114                 goto err_out;
 115
 116         if (d_is_negative(d)) {
 117                 dput(d);
 118                 goto err_out;
 119         }
 120
 121         path->dentry = d;
 122         path->mnt = mntget(parent_path->mnt);
 123
 124         if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) {
 125                 err = follow_down(path, 0);
 126                 if (err < 0) {
 127                         path_put(path);
 128                         goto err_out;
 129                 }
 130         }
 131
 132         putname(filename);
 133         return 0;
 134
 135 err_out:
 136         inode_unlock(d_inode(parent_path->dentry));
 137         mnt_drop_write(parent_path->mnt);
 138         path_put(parent_path);
 139         putname(filename);
 140         return -ENOENT;
 141 }
 142
 143 void ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap,
 144                                    struct dentry *dentry, __le32 *daccess)
 145 {
 146         *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
 147
 148         if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE))
 149                 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
 150                                 FILE_WRITE_DATA | FILE_APPEND_DATA |
 151                                 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
 152                                 FILE_DELETE_CHILD);
 153
 154         if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ))
 155                 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
 156
 157         if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC))
 158                 *daccess |= FILE_EXECUTE_LE;
 159
 160         if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE))
 161                 *daccess |= FILE_DELETE_LE;
 162 }
 163
 164 /**
 165  * ksmbd_vfs_create() - vfs helper for smb create file
 166  * @work:       work
 167  * @name:       file name that is relative to share
 168  * @mode:       file create mode
 169  *
 170  * Return:      0 on success, otherwise error
 171  */
 172 int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
 173 {
 174         struct path path;
 175         struct dentry *dentry;
 176         int err;
 177
 178         dentry = ksmbd_vfs_kern_path_create(work, name,
 179                                             LOOKUP_NO_SYMLINKS, &path);
 180         if (IS_ERR(dentry)) {
 181                 err = PTR_ERR(dentry);
 182                 if (err != -ENOENT)
 183                         pr_err("path create failed for %s, err %d\n",
 184                                name, err);
 185                 return err;
 186         }
 187
 188         mode |= S_IFREG;
 189         err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry),
 190                          dentry, mode, true);
 191         if (!err) {
 192                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
 193                                         d_inode(dentry));
 194         } else {
 195                 pr_err("File(%s): creation failed (err:%d)\n", name, err);
 196         }
 197
 198         done_path_create(&path, dentry);
 199         return err;
 200 }
 201
 202 /**
 203  * ksmbd_vfs_mkdir() - vfs helper for smb create directory
 204  * @work:       work
 205  * @name:       directory name that is relative to share
 206  * @mode:       directory create mode
 207  *
 208  * Return:      0 on success, otherwise error
 209  */
 210 int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
 211 {
 212         struct mnt_idmap *idmap;
 213         struct path path;
 214         struct dentry *dentry;
 215         int err;
 216
 217         dentry = ksmbd_vfs_kern_path_create(work, name,
 218                                             LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
 219                                             &path);
 220         if (IS_ERR(dentry)) {
 221                 err = PTR_ERR(dentry);
 222                 if (err != -EEXIST)
 223                         ksmbd_debug(VFS, "path create failed for %s, err %d\n",
 224                                     name, err);
 225                 return err;
 226         }
 227
 228         idmap = mnt_idmap(path.mnt);
 229         mode |= S_IFDIR;
 230         err = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode);
 231         if (!err && d_unhashed(dentry)) {
 232                 struct dentry *d;
 233
 234                 d = lookup_one(idmap, dentry->d_name.name, dentry->d_parent,
 235                                dentry->d_name.len);
 236                 if (IS_ERR(d)) {
 237                         err = PTR_ERR(d);
 238                         goto out_err;
 239                 }
 240                 if (unlikely(d_is_negative(d))) {
 241                         dput(d);
 242                         err = -ENOENT;
 243                         goto out_err;
 244                 }
 245
 246                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
 247                 dput(d);
 248         }
 249
 250 out_err:
 251         done_path_create(&path, dentry);
 252         if (err)
 253                 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err);
 254         return err;
 255 }
 256
 257 static ssize_t ksmbd_vfs_getcasexattr(struct mnt_idmap *idmap,
 258                                       struct dentry *dentry, char *attr_name,
 259                                       int attr_name_len, char **attr_value)
 260 {
 261         char *name, *xattr_list = NULL;
 262         ssize_t value_len = -ENOENT, xattr_list_len;
 263
 264         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
 265         if (xattr_list_len <= 0)
 266                 goto out;
 267
 268         for (name = xattr_list; name - xattr_list < xattr_list_len;
 269                         name += strlen(name) + 1) {
 270                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
 271                 if (strncasecmp(attr_name, name, attr_name_len))
 272                         continue;
 273
 274                 value_len = ksmbd_vfs_getxattr(idmap,
 275                                                dentry,
 276                                                name,
 277                                                attr_value);
 278                 if (value_len < 0)
 279                         pr_err("failed to get xattr in file\n");
 280                 break;
 281         }
 282
 283 out:
 284         kvfree(xattr_list);
 285         return value_len;
 286 }
 287
 288 static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
 289                                  size_t count)
 290 {
 291         ssize_t v_len;
 292         char *stream_buf = NULL;
 293
 294         ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
 295                     *pos, count);
 296
 297         v_len = ksmbd_vfs_getcasexattr(file_mnt_idmap(fp->filp),
 298                                        fp->filp->f_path.dentry,
 299                                        fp->stream.name,
 300                                        fp->stream.size,
 301                                        &stream_buf);
 302         if ((int)v_len <= 0)
 303                 return (int)v_len;
 304
 305         if (v_len <= *pos) {
 306                 count = -EINVAL;
 307                 goto free_buf;
 308         }
 309
 310         if (v_len - *pos < count)
 311                 count = v_len - *pos;
 312
 313         memcpy(buf, &stream_buf[*pos], count);
 314
 315 free_buf:
 316         kvfree(stream_buf);
 317         return count;
 318 }
 319
 320 /**
 321  * check_lock_range() - vfs helper for smb byte range file locking
 322  * @filp:       the file to apply the lock to
 323  * @start:      lock start byte offset
 324  * @end:        lock end byte offset
 325  * @type:       byte range type read/write
 326  *
 327  * Return:      0 on success, otherwise error
 328  */
 329 static int check_lock_range(struct file *filp, loff_t start, loff_t end,
 330                             unsigned char type)
 331 {
 332         struct file_lock *flock;
 333         struct file_lock_context *ctx = locks_inode_context(file_inode(filp));
 334         int error = 0;
 335
 336         if (!ctx || list_empty_careful(&ctx->flc_posix))
 337                 return 0;
 338
 339         spin_lock(&ctx->flc_lock);
 340         for_each_file_lock(flock, &ctx->flc_posix) {
 341                 /* check conflict locks */
 342                 if (flock->fl_end >= start && end >= flock->fl_start) {
 343                         if (lock_is_read(flock)) {
 344                                 if (type == WRITE) {
 345                                         pr_err("not allow write by shared lock\n");
 346                                         error = 1;
 347                                         goto out;
 348                                 }
 349                         } else if (lock_is_write(flock)) {
 350                                 /* check owner in lock */
 351                                 if (flock->c.flc_file != filp) {
 352                                         error = 1;
 353                                         pr_err("not allow rw access by exclusive lock from other opens\n");
 354                                         goto out;
 355                                 }
 356                         }
 357                 }
 358         }
 359 out:
 360         spin_unlock(&ctx->flc_lock);
 361         return error;
 362 }
 363
 364 /**
 365  * ksmbd_vfs_read() - vfs helper for smb file read
 366  * @work:       smb work
 367  * @fp:         ksmbd file pointer
 368  * @count:      read byte count
 369  * @pos:        file pos
 370  * @rbuf:       read data buffer
 371  *
 372  * Return:      number of read bytes on success, otherwise error
 373  */
 374 int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count,
 375                    loff_t *pos, char *rbuf)
 376 {
 377         struct file *filp = fp->filp;
 378         ssize_t nbytes = 0;
 379         struct inode *inode = file_inode(filp);
 380
 381         if (S_ISDIR(inode->i_mode))
 382                 return -EISDIR;
 383
 384         if (unlikely(count == 0))
 385                 return 0;
 386
 387         if (work->conn->connection_type) {
 388                 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
 389                         pr_err("no right to read(%pD)\n", fp->filp);
 390                         return -EACCES;
 391                 }
 392         }
 393
 394         if (ksmbd_stream_fd(fp))
 395                 return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
 396
 397         if (!work->tcon->posix_extensions) {
 398                 int ret;
 399
 400                 ret = check_lock_range(filp, *pos, *pos + count - 1, READ);
 401                 if (ret) {
 402                         pr_err("unable to read due to lock\n");
 403                         return -EAGAIN;
 404                 }
 405         }
 406
 407         nbytes = kernel_read(filp, rbuf, count, pos);
 408         if (nbytes < 0) {
 409                 pr_err("smb read failed, err = %zd\n", nbytes);
 410                 return nbytes;
 411         }
 412
 413         filp->f_pos = *pos;
 414         return nbytes;
 415 }
 416
 417 static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
 418                                   size_t count)
 419 {
 420         char *stream_buf = NULL, *wbuf;
 421         struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
 422         size_t size;
 423         ssize_t v_len;
 424         int err = 0;
 425
 426         ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
 427                     *pos, count);
 428
 429         size = *pos + count;
 430         if (size > XATTR_SIZE_MAX) {
 431                 size = XATTR_SIZE_MAX;
 432                 count = (*pos + count) - XATTR_SIZE_MAX;
 433         }
 434
 435         v_len = ksmbd_vfs_getcasexattr(idmap,
 436                                        fp->filp->f_path.dentry,
 437                                        fp->stream.name,
 438                                        fp->stream.size,
 439                                        &stream_buf);
 440         if (v_len < 0) {
 441                 pr_err("not found stream in xattr : %zd\n", v_len);
 442                 err = v_len;
 443                 goto out;
 444         }
 445
 446         if (v_len < size) {
 447                 wbuf = kvzalloc(size, GFP_KERNEL);
 448                 if (!wbuf) {
 449                         err = -ENOMEM;
 450                         goto out;
 451                 }
 452
 453                 if (v_len > 0)
 454                         memcpy(wbuf, stream_buf, v_len);
 455                 kvfree(stream_buf);
 456                 stream_buf = wbuf;
 457         }
 458
 459         memcpy(&stream_buf[*pos], buf, count);
 460
 461         err = ksmbd_vfs_setxattr(idmap,
 462                                  &fp->filp->f_path,
 463                                  fp->stream.name,
 464                                  (void *)stream_buf,
 465                                  size,
 466                                  0,
 467                                  true);
 468         if (err < 0)
 469                 goto out;
 470
 471         fp->filp->f_pos = *pos;
 472         err = 0;
 473 out:
 474         kvfree(stream_buf);
 475         return err;
 476 }
 477
 478 /**
 479  * ksmbd_vfs_write() - vfs helper for smb file write
 480  * @work:       work
 481  * @fp:         ksmbd file pointer
 482  * @buf:        buf containing data for writing
 483  * @count:      read byte count
 484  * @pos:        file pos
 485  * @sync:       fsync after write
 486  * @written:    number of bytes written
 487  *
 488  * Return:      0 on success, otherwise error
 489  */
 490 int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
 491                     char *buf, size_t count, loff_t *pos, bool sync,
 492                     ssize_t *written)
 493 {
 494         struct file *filp;
 495         loff_t  offset = *pos;
 496         int err = 0;
 497
 498         if (work->conn->connection_type) {
 499                 if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
 500                         pr_err("no right to write(%pD)\n", fp->filp);
 501                         err = -EACCES;
 502                         goto out;
 503                 }
 504         }
 505
 506         filp = fp->filp;
 507
 508         if (ksmbd_stream_fd(fp)) {
 509                 err = ksmbd_vfs_stream_write(fp, buf, pos, count);
 510                 if (!err)
 511                         *written = count;
 512                 goto out;
 513         }
 514
 515         if (!work->tcon->posix_extensions) {
 516                 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
 517                 if (err) {
 518                         pr_err("unable to write due to lock\n");
 519                         err = -EAGAIN;
 520                         goto out;
 521                 }
 522         }
 523
 524         /* Reserve lease break for parent dir at closing time */
 525         fp->reserve_lease_break = true;
 526
 527         /* Do we need to break any of a levelII oplock? */
 528         smb_break_all_levII_oplock(work, fp, 1);
 529
 530         err = kernel_write(filp, buf, count, pos);
 531         if (err < 0) {
 532                 ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
 533                 goto out;
 534         }
 535
 536         filp->f_pos = *pos;
 537         *written = err;
 538         err = 0;
 539         if (sync) {
 540                 err = vfs_fsync_range(filp, offset, offset + *written, 0);
 541                 if (err < 0)
 542                         pr_err("fsync failed for filename = %pD, err = %d\n",
 543                                fp->filp, err);
 544         }
 545
 546 out:
 547         return err;
 548 }
 549
 550 /**
 551  * ksmbd_vfs_getattr() - vfs helper for smb getattr
 552  * @path:       path of dentry
 553  * @stat:       pointer to returned kernel stat structure
 554  * Return:      0 on success, otherwise error
 555  */
 556 int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
 557 {
 558         int err;
 559
 560         err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
 561         if (err)
 562                 pr_err("getattr failed, err %d\n", err);
 563         return err;
 564 }
 565
 566 /**
 567  * ksmbd_vfs_fsync() - vfs helper for smb fsync
 568  * @work:       work
 569  * @fid:        file id of open file
 570  * @p_id:       persistent file id
 571  *
 572  * Return:      0 on success, otherwise error
 573  */
 574 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
 575 {
 576         struct ksmbd_file *fp;
 577         int err;
 578
 579         fp = ksmbd_lookup_fd_slow(work, fid, p_id);
 580         if (!fp) {
 581                 pr_err("failed to get filp for fid %llu\n", fid);
 582                 return -ENOENT;
 583         }
 584         err = vfs_fsync(fp->filp, 0);
 585         if (err < 0)
 586                 pr_err("smb fsync failed, err = %d\n", err);
 587         ksmbd_fd_put(work, fp);
 588         return err;
 589 }
 590
 591 /**
 592  * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
 593  * @work:       work
 594  * @path:       path of dentry
 595  *
 596  * Return:      0 on success, otherwise error
 597  */
 598 int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)
 599 {
 600         struct mnt_idmap *idmap;
 601         struct dentry *parent = path->dentry->d_parent;
 602         int err;
 603
 604         if (ksmbd_override_fsids(work))
 605                 return -ENOMEM;
 606
 607         if (!d_inode(path->dentry)->i_nlink) {
 608                 err = -ENOENT;
 609                 goto out_err;
 610         }
 611
 612         idmap = mnt_idmap(path->mnt);
 613         if (S_ISDIR(d_inode(path->dentry)->i_mode)) {
 614                 err = vfs_rmdir(idmap, d_inode(parent), path->dentry);
 615                 if (err && err != -ENOTEMPTY)
 616                         ksmbd_debug(VFS, "rmdir failed, err %d\n", err);
 617         } else {
 618                 err = vfs_unlink(idmap, d_inode(parent), path->dentry, NULL);
 619                 if (err)
 620                         ksmbd_debug(VFS, "unlink failed, err %d\n", err);
 621         }
 622
 623 out_err:
 624         ksmbd_revert_fsids(work);
 625         return err;
 626 }
 627
 628 /**
 629  * ksmbd_vfs_link() - vfs helper for creating smb hardlink
 630  * @work:       work
 631  * @oldname:    source file name
 632  * @newname:    hardlink name that is relative to share
 633  *
 634  * Return:      0 on success, otherwise error
 635  */
 636 int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
 637                    const char *newname)
 638 {
 639         struct path oldpath, newpath;
 640         struct dentry *dentry;
 641         int err;
 642
 643         if (ksmbd_override_fsids(work))
 644                 return -ENOMEM;
 645
 646         err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
 647         if (err) {
 648                 pr_err("cannot get linux path for %s, err = %d\n",
 649                        oldname, err);
 650                 goto out1;
 651         }
 652
 653         dentry = ksmbd_vfs_kern_path_create(work, newname,
 654                                             LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
 655                                             &newpath);
 656         if (IS_ERR(dentry)) {
 657                 err = PTR_ERR(dentry);
 658                 pr_err("path create err for %s, err %d\n", newname, err);
 659                 goto out2;
 660         }
 661
 662         err = -EXDEV;
 663         if (oldpath.mnt != newpath.mnt) {
 664                 pr_err("vfs_link failed err %d\n", err);
 665                 goto out3;
 666         }
 667
 668         err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt),
 669                        d_inode(newpath.dentry),
 670                        dentry, NULL);
 671         if (err)
 672                 ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
 673
 674 out3:
 675         done_path_create(&newpath, dentry);
 676 out2:
 677         path_put(&oldpath);
 678 out1:
 679         ksmbd_revert_fsids(work);
 680         return err;
 681 }
 682
 683 int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
 684                      char *newname, int flags)
 685 {
 686         struct dentry *old_parent, *new_dentry, *trap;
 687         struct dentry *old_child = old_path->dentry;
 688         struct path new_path;
 689         struct qstr new_last;
 690         struct renamedata rd;
 691         struct filename *to;
 692         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
 693         struct ksmbd_file *parent_fp;
 694         int new_type;
 695         int err, lookup_flags = LOOKUP_NO_SYMLINKS;
 696
 697         if (ksmbd_override_fsids(work))
 698                 return -ENOMEM;
 699
 700         to = getname_kernel(newname);
 701         if (IS_ERR(to)) {
 702                 err = PTR_ERR(to);
 703                 goto revert_fsids;
 704         }
 705
 706 retry:
 707         err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH,
 708                                      &new_path, &new_last, &new_type,
 709                                      &share_conf->vfs_path);
 710         if (err)
 711                 goto out1;
 712
 713         if (old_path->mnt != new_path.mnt) {
 714                 err = -EXDEV;
 715                 goto out2;
 716         }
 717
 718         err = mnt_want_write(old_path->mnt);
 719         if (err)
 720                 goto out2;
 721
 722         trap = lock_rename_child(old_child, new_path.dentry);
 723         if (IS_ERR(trap)) {
 724                 err = PTR_ERR(trap);
 725                 goto out_drop_write;
 726         }
 727
 728         old_parent = dget(old_child->d_parent);
 729         if (d_unhashed(old_child)) {
 730                 err = -EINVAL;
 731                 goto out3;
 732         }
 733
 734         parent_fp = ksmbd_lookup_fd_inode(old_child->d_parent);
 735         if (parent_fp) {
 736                 if (parent_fp->daccess & FILE_DELETE_LE) {
 737                         pr_err("parent dir is opened with delete access\n");
 738                         err = -ESHARE;
 739                         ksmbd_fd_put(work, parent_fp);
 740                         goto out3;
 741                 }
 742                 ksmbd_fd_put(work, parent_fp);
 743         }
 744
 745         new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry,
 746                                           lookup_flags | LOOKUP_RENAME_TARGET);
 747         if (IS_ERR(new_dentry)) {
 748                 err = PTR_ERR(new_dentry);
 749                 goto out3;
 750         }
 751
 752         if (d_is_symlink(new_dentry)) {
 753                 err = -EACCES;
 754                 goto out4;
 755         }
 756
 757         /*
 758          * explicitly handle file overwrite case, for compatibility with
 759          * filesystems that may not support rename flags (e.g: fuse)
 760          */
 761         if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) {
 762                 err = -EEXIST;
 763                 goto out4;
 764         }
 765         flags &= ~(RENAME_NOREPLACE);
 766
 767         if (old_child == trap) {
 768                 err = -EINVAL;
 769                 goto out4;
 770         }
 771
 772         if (new_dentry == trap) {
 773                 err = -ENOTEMPTY;
 774                 goto out4;
 775         }
 776
 777         rd.old_mnt_idmap        = mnt_idmap(old_path->mnt),
 778         rd.old_dir              = d_inode(old_parent),
 779         rd.old_dentry           = old_child,
 780         rd.new_mnt_idmap        = mnt_idmap(new_path.mnt),
 781         rd.new_dir              = new_path.dentry->d_inode,
 782         rd.new_dentry           = new_dentry,
 783         rd.flags                = flags,
 784         rd.delegated_inode      = NULL,
 785         err = vfs_rename(&rd);
 786         if (err)
 787                 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);
 788
 789 out4:
 790         dput(new_dentry);
 791 out3:
 792         dput(old_parent);
 793         unlock_rename(old_parent, new_path.dentry);
 794 out_drop_write:
 795         mnt_drop_write(old_path->mnt);
 796 out2:
 797         path_put(&new_path);
 798
 799         if (retry_estale(err, lookup_flags)) {
 800                 lookup_flags |= LOOKUP_REVAL;
 801                 goto retry;
 802         }
 803 out1:
 804         putname(to);
 805 revert_fsids:
 806         ksmbd_revert_fsids(work);
 807         return err;
 808 }
 809
 810 /**
 811  * ksmbd_vfs_truncate() - vfs helper for smb file truncate
 812  * @work:       work
 813  * @fp:         ksmbd file pointer
 814  * @size:       truncate to given size
 815  *
 816  * Return:      0 on success, otherwise error
 817  */
 818 int ksmbd_vfs_truncate(struct ksmbd_work *work,
 819                        struct ksmbd_file *fp, loff_t size)
 820 {
 821         int err = 0;
 822         struct file *filp;
 823
 824         filp = fp->filp;
 825
 826         /* Do we need to break any of a levelII oplock? */
 827         smb_break_all_levII_oplock(work, fp, 1);
 828
 829         if (!work->tcon->posix_extensions) {
 830                 struct inode *inode = file_inode(filp);
 831
 832                 if (size < inode->i_size) {
 833                         err = check_lock_range(filp, size,
 834                                                inode->i_size - 1, WRITE);
 835                 } else {
 836                         err = check_lock_range(filp, inode->i_size,
 837                                                size - 1, WRITE);
 838                 }
 839
 840                 if (err) {
 841                         pr_err("failed due to lock\n");
 842                         return -EAGAIN;
 843                 }
 844         }
 845
 846         err = vfs_truncate(&filp->f_path, size);
 847         if (err)
 848                 pr_err("truncate failed, err %d\n", err);
 849         return err;
 850 }
 851
 852 /**
 853  * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
 854  * @dentry:     dentry of file for listing xattrs
 855  * @list:       destination buffer
 856  *
 857  * Return:      xattr list length on success, otherwise error
 858  */
 859 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
 860 {
 861         ssize_t size;
 862         char *vlist = NULL;
 863
 864         size = vfs_listxattr(dentry, NULL, 0);
 865         if (size <= 0)
 866                 return size;
 867
 868         vlist = kvzalloc(size, GFP_KERNEL);
 869         if (!vlist)
 870                 return -ENOMEM;
 871
 872         *list = vlist;
 873         size = vfs_listxattr(dentry, vlist, size);
 874         if (size < 0) {
 875                 ksmbd_debug(VFS, "listxattr failed\n");
 876                 kvfree(vlist);
 877                 *list = NULL;
 878         }
 879
 880         return size;
 881 }
 882
 883 static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap,
 884                                    struct dentry *dentry, char *xattr_name)
 885 {
 886         return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0);
 887 }
 888
 889 /**
 890  * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
 891  * @idmap:      idmap
 892  * @dentry:     dentry of file for getting xattrs
 893  * @xattr_name: name of xattr name to query
 894  * @xattr_buf:  destination buffer xattr value
 895  *
 896  * Return:      read xattr value length on success, otherwise error
 897  */
 898 ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap,
 899                            struct dentry *dentry,
 900                            char *xattr_name, char **xattr_buf)
 901 {
 902         ssize_t xattr_len;
 903         char *buf;
 904
 905         *xattr_buf = NULL;
 906         xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name);
 907         if (xattr_len < 0)
 908                 return xattr_len;
 909
 910         buf = kmalloc(xattr_len + 1, GFP_KERNEL);
 911         if (!buf)
 912                 return -ENOMEM;
 913
 914         xattr_len = vfs_getxattr(idmap, dentry, xattr_name,
 915                                  (void *)buf, xattr_len);
 916         if (xattr_len > 0)
 917                 *xattr_buf = buf;
 918         else
 919                 kfree(buf);
 920         return xattr_len;
 921 }
 922
 923 /**
 924  * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
 925  * @idmap:      idmap of the relevant mount
 926  * @path:       path of dentry to set XATTR at
 927  * @attr_name:  xattr name for setxattr
 928  * @attr_value: xattr value to set
 929  * @attr_size:  size of xattr value
 930  * @flags:      destination buffer length
 931  * @get_write:  get write access to a mount
 932  *
 933  * Return:      0 on success, otherwise error
 934  */
 935 int ksmbd_vfs_setxattr(struct mnt_idmap *idmap,
 936                        const struct path *path, const char *attr_name,
 937                        void *attr_value, size_t attr_size, int flags,
 938                        bool get_write)
 939 {
 940         int err;
 941
 942         if (get_write == true) {
 943                 err = mnt_want_write(path->mnt);
 944                 if (err)
 945                         return err;
 946         }
 947
 948         err = vfs_setxattr(idmap,
 949                            path->dentry,
 950                            attr_name,
 951                            attr_value,
 952                            attr_size,
 953                            flags);
 954         if (err)
 955                 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
 956         if (get_write == true)
 957                 mnt_drop_write(path->mnt);
 958         return err;
 959 }
 960
 961 /**
 962  * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
 963  * @filp:       file pointer for IO
 964  * @option:     smb IO options
 965  */
 966 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
 967 {
 968         struct address_space *mapping;
 969
 970         mapping = filp->f_mapping;
 971
 972         if (!option || !mapping)
 973                 return;
 974
 975         if (option & FILE_WRITE_THROUGH_LE) {
 976                 filp->f_flags |= O_SYNC;
 977         } else if (option & FILE_SEQUENTIAL_ONLY_LE) {
 978                 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
 979                 spin_lock(&filp->f_lock);
 980                 filp->f_mode &= ~FMODE_RANDOM;
 981                 spin_unlock(&filp->f_lock);
 982         } else if (option & FILE_RANDOM_ACCESS_LE) {
 983                 spin_lock(&filp->f_lock);
 984                 filp->f_mode |= FMODE_RANDOM;
 985                 spin_unlock(&filp->f_lock);
 986         }
 987 }
 988
 989 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
 990                         loff_t off, loff_t len)
 991 {
 992         smb_break_all_levII_oplock(work, fp, 1);
 993         if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
 994                 return vfs_fallocate(fp->filp,
 995                                      FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
 996                                      off, len);
 997
 998         return vfs_fallocate(fp->filp,
 999                              FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
1000                              off, len);
1001 }
1002
1003 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
1004                          struct file_allocated_range_buffer *ranges,
1005                          unsigned int in_count, unsigned int *out_count)
1006 {
1007         struct file *f = fp->filp;
1008         struct inode *inode = file_inode(fp->filp);
1009         loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
1010         loff_t extent_start, extent_end;
1011         int ret = 0;
1012
1013         if (start > maxbytes)
1014                 return -EFBIG;
1015
1016         if (!in_count)
1017                 return 0;
1018
1019         /*
1020          * Shrink request scope to what the fs can actually handle.
1021          */
1022         if (length > maxbytes || (maxbytes - length) < start)
1023                 length = maxbytes - start;
1024
1025         if (start + length > inode->i_size)
1026                 length = inode->i_size - start;
1027
1028         *out_count = 0;
1029         end = start + length;
1030         while (start < end && *out_count < in_count) {
1031                 extent_start = vfs_llseek(f, start, SEEK_DATA);
1032                 if (extent_start < 0) {
1033                         if (extent_start != -ENXIO)
1034                                 ret = (int)extent_start;
1035                         break;
1036                 }
1037
1038                 if (extent_start >= end)
1039                         break;
1040
1041                 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
1042                 if (extent_end < 0) {
1043                         if (extent_end != -ENXIO)
1044                                 ret = (int)extent_end;
1045                         break;
1046                 } else if (extent_start >= extent_end) {
1047                         break;
1048                 }
1049
1050                 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1051                 ranges[(*out_count)++].length =
1052                         cpu_to_le64(min(extent_end, end) - extent_start);
1053
1054                 start = extent_end;
1055         }
1056
1057         return ret;
1058 }
1059
1060 int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap,
1061                            const struct path *path, char *attr_name)
1062 {
1063         int err;
1064
1065         err = mnt_want_write(path->mnt);
1066         if (err)
1067                 return err;
1068
1069         err = vfs_removexattr(idmap, path->dentry, attr_name);
1070         mnt_drop_write(path->mnt);
1071
1072         return err;
1073 }
1074
1075 int ksmbd_vfs_unlink(struct file *filp)
1076 {
1077         int err = 0;
1078         struct dentry *dir, *dentry = filp->f_path.dentry;
1079         struct mnt_idmap *idmap = file_mnt_idmap(filp);
1080
1081         err = mnt_want_write(filp->f_path.mnt);
1082         if (err)
1083                 return err;
1084
1085         dir = dget_parent(dentry);
1086         err = ksmbd_vfs_lock_parent(dir, dentry);
1087         if (err)
1088                 goto out;
1089         dget(dentry);
1090
1091         if (S_ISDIR(d_inode(dentry)->i_mode))
1092                 err = vfs_rmdir(idmap, d_inode(dir), dentry);
1093         else
1094                 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL);
1095
1096         dput(dentry);
1097         inode_unlock(d_inode(dir));
1098         if (err)
1099                 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1100 out:
1101         dput(dir);
1102         mnt_drop_write(filp->f_path.mnt);
1103
1104         return err;
1105 }
1106
1107 static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1108                        loff_t offset, u64 ino, unsigned int d_type)
1109 {
1110         struct ksmbd_readdir_data *buf;
1111
1112         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1113         buf->dirent_count++;
1114
1115         return buf->dirent_count <= 2;
1116 }
1117
1118 /**
1119  * ksmbd_vfs_empty_dir() - check for empty directory
1120  * @fp: ksmbd file pointer
1121  *
1122  * Return:      true if directory empty, otherwise false
1123  */
1124 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1125 {
1126         int err;
1127         struct ksmbd_readdir_data readdir_data;
1128
1129         memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1130
1131         set_ctx_actor(&readdir_data.ctx, __dir_empty);
1132         readdir_data.dirent_count = 0;
1133
1134         err = iterate_dir(fp->filp, &readdir_data.ctx);
1135         if (readdir_data.dirent_count > 2)
1136                 err = -ENOTEMPTY;
1137         else
1138                 err = 0;
1139         return err;
1140 }
1141
1142 static bool __caseless_lookup(struct dir_context *ctx, const char *name,
1143                              int namlen, loff_t offset, u64 ino,
1144                              unsigned int d_type)
1145 {
1146         struct ksmbd_readdir_data *buf;
1147         int cmp = -EINVAL;
1148
1149         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1150
1151         if (buf->used != namlen)
1152                 return true;
1153         if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
1154                 const struct qstr q_buf = {.name = buf->private,
1155                                            .len = buf->used};
1156                 const struct qstr q_name = {.name = name,
1157                                             .len = namlen};
1158
1159                 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
1160         }
1161         if (cmp < 0)
1162                 cmp = strncasecmp((char *)buf->private, name, namlen);
1163         if (!cmp) {
1164                 memcpy((char *)buf->private, name, namlen);
1165                 buf->dirent_count = 1;
1166                 return false;
1167         }
1168         return true;
1169 }
1170
1171 /**
1172  * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1173  * @dir:        path info
1174  * @name:       filename to lookup
1175  * @namelen:    filename length
1176  * @um:         &struct unicode_map to use
1177  *
1178  * Return:      0 on success, otherwise error
1179  */
1180 static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
1181                                    size_t namelen, struct unicode_map *um)
1182 {
1183         int ret;
1184         struct file *dfilp;
1185         int flags = O_RDONLY | O_LARGEFILE;
1186         struct ksmbd_readdir_data readdir_data = {
1187                 .ctx.actor      = __caseless_lookup,
1188                 .private        = name,
1189                 .used           = namelen,
1190                 .dirent_count   = 0,
1191                 .um             = um,
1192         };
1193
1194         dfilp = dentry_open(dir, flags, current_cred());
1195         if (IS_ERR(dfilp))
1196                 return PTR_ERR(dfilp);
1197
1198         ret = iterate_dir(dfilp, &readdir_data.ctx);
1199         if (readdir_data.dirent_count > 0)
1200                 ret = 0;
1201         fput(dfilp);
1202         return ret;
1203 }
1204
1205 /**
1206  * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
1207  * @work:       work
1208  * @name:               file path that is relative to share
1209  * @flags:              lookup flags
1210  * @parent_path:        if lookup succeed, return parent_path info
1211  * @path:               if lookup succeed, return path info
1212  * @caseless:   caseless filename lookup
1213  *
1214  * Return:      0 on success, otherwise error
1215  */
1216 int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
1217                                unsigned int flags, struct path *parent_path,
1218                                struct path *path, bool caseless)
1219 {
1220         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1221         int err;
1222
1223         err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path,
1224                                            path);
1225         if (!err)
1226                 return 0;
1227
1228         if (caseless) {
1229                 char *filepath;
1230                 size_t path_len, remain_len;
1231
1232                 filepath = kstrdup(name, GFP_KERNEL);
1233                 if (!filepath)
1234                         return -ENOMEM;
1235
1236                 path_len = strlen(filepath);
1237                 remain_len = path_len;
1238
1239                 *parent_path = share_conf->vfs_path;
1240                 path_get(parent_path);
1241
1242                 while (d_can_lookup(parent_path->dentry)) {
1243                         char *filename = filepath + path_len - remain_len;
1244                         char *next = strchrnul(filename, '/');
1245                         size_t filename_len = next - filename;
1246                         bool is_last = !next[0];
1247
1248                         if (filename_len == 0)
1249                                 break;
1250
1251                         err = ksmbd_vfs_lookup_in_dir(parent_path, filename,
1252                                                       filename_len,
1253                                                       work->conn->um);
1254                         if (err)
1255                                 goto out2;
1256
1257                         next[0] = '\0';
1258
1259                         err = vfs_path_lookup(share_conf->vfs_path.dentry,
1260                                               share_conf->vfs_path.mnt,
1261                                               filepath,
1262                                               flags,
1263                                               path);
1264                         if (err)
1265                                 goto out2;
1266                         else if (is_last)
1267                                 goto out1;
1268                         path_put(parent_path);
1269                         *parent_path = *path;
1270
1271                         next[0] = '/';
1272                         remain_len -= filename_len + 1;
1273                 }
1274
1275                 err = -EINVAL;
1276 out2:
1277                 path_put(parent_path);
1278 out1:
1279                 kfree(filepath);
1280         }
1281
1282         if (!err) {
1283                 err = mnt_want_write(parent_path->mnt);
1284                 if (err) {
1285                         path_put(path);
1286                         path_put(parent_path);
1287                         return err;
1288                 }
1289
1290                 err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry);
1291                 if (err) {
1292                         path_put(path);
1293                         path_put(parent_path);
1294                 }
1295         }
1296         return err;
1297 }
1298
1299 void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path)
1300 {
1301         inode_unlock(d_inode(parent_path->dentry));
1302         mnt_drop_write(parent_path->mnt);
1303         path_put(path);
1304         path_put(parent_path);
1305 }
1306
1307 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1308                                           const char *name,
1309                                           unsigned int flags,
1310                                           struct path *path)
1311 {
1312         char *abs_name;
1313         struct dentry *dent;
1314
1315         abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1316         if (!abs_name)
1317                 return ERR_PTR(-ENOMEM);
1318
1319         dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1320         kfree(abs_name);
1321         return dent;
1322 }
1323
1324 int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap,
1325                                 const struct path *path)
1326 {
1327         char *name, *xattr_list = NULL;
1328         ssize_t xattr_list_len;
1329         int err = 0;
1330
1331         xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1332         if (xattr_list_len < 0) {
1333                 goto out;
1334         } else if (!xattr_list_len) {
1335                 ksmbd_debug(SMB, "empty xattr in the file\n");
1336                 goto out;
1337         }
1338
1339         err = mnt_want_write(path->mnt);
1340         if (err)
1341                 goto out;
1342
1343         for (name = xattr_list; name - xattr_list < xattr_list_len;
1344              name += strlen(name) + 1) {
1345                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1346
1347                 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1348                              sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1349                     !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1350                              sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1351                         err = vfs_remove_acl(idmap, path->dentry, name);
1352                         if (err)
1353                                 ksmbd_debug(SMB,
1354                                             "remove acl xattr failed : %s\n", name);
1355                 }
1356         }
1357         mnt_drop_write(path->mnt);
1358
1359 out:
1360         kvfree(xattr_list);
1361         return err;
1362 }
1363
1364 int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path)
1365 {
1366         char *name, *xattr_list = NULL;
1367         ssize_t xattr_list_len;
1368         int err = 0;
1369
1370         xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1371         if (xattr_list_len < 0) {
1372                 goto out;
1373         } else if (!xattr_list_len) {
1374                 ksmbd_debug(SMB, "empty xattr in the file\n");
1375                 goto out;
1376         }
1377
1378         for (name = xattr_list; name - xattr_list < xattr_list_len;
1379                         name += strlen(name) + 1) {
1380                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1381
1382                 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1383                         err = ksmbd_vfs_remove_xattr(idmap, path, name);
1384                         if (err)
1385                                 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1386                 }
1387         }
1388 out:
1389         kvfree(xattr_list);
1390         return err;
1391 }
1392
1393 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap,
1394                                                             struct inode *inode,
1395                                                             int acl_type)
1396 {
1397         struct xattr_smb_acl *smb_acl = NULL;
1398         struct posix_acl *posix_acls;
1399         struct posix_acl_entry *pa_entry;
1400         struct xattr_acl_entry *xa_entry;
1401         int i;
1402
1403         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1404                 return NULL;
1405
1406         posix_acls = get_inode_acl(inode, acl_type);
1407         if (IS_ERR_OR_NULL(posix_acls))
1408                 return NULL;
1409
1410         smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1411                           sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1412                           GFP_KERNEL);
1413         if (!smb_acl)
1414                 goto out;
1415
1416         smb_acl->count = posix_acls->a_count;
1417         pa_entry = posix_acls->a_entries;
1418         xa_entry = smb_acl->entries;
1419         for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1420                 switch (pa_entry->e_tag) {
1421                 case ACL_USER:
1422                         xa_entry->type = SMB_ACL_USER;
1423                         xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry);
1424                         break;
1425                 case ACL_USER_OBJ:
1426                         xa_entry->type = SMB_ACL_USER_OBJ;
1427                         break;
1428                 case ACL_GROUP:
1429                         xa_entry->type = SMB_ACL_GROUP;
1430                         xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry);
1431                         break;
1432                 case ACL_GROUP_OBJ:
1433                         xa_entry->type = SMB_ACL_GROUP_OBJ;
1434                         break;
1435                 case ACL_OTHER:
1436                         xa_entry->type = SMB_ACL_OTHER;
1437                         break;
1438                 case ACL_MASK:
1439                         xa_entry->type = SMB_ACL_MASK;
1440                         break;
1441                 default:
1442                         pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1443                         goto out;
1444                 }
1445
1446                 if (pa_entry->e_perm & ACL_READ)
1447                         xa_entry->perm |= SMB_ACL_READ;
1448                 if (pa_entry->e_perm & ACL_WRITE)
1449                         xa_entry->perm |= SMB_ACL_WRITE;
1450                 if (pa_entry->e_perm & ACL_EXECUTE)
1451                         xa_entry->perm |= SMB_ACL_EXECUTE;
1452         }
1453 out:
1454         posix_acl_release(posix_acls);
1455         return smb_acl;
1456 }
1457
1458 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1459                            struct mnt_idmap *idmap,
1460                            const struct path *path,
1461                            struct smb_ntsd *pntsd, int len,
1462                            bool get_write)
1463 {
1464         int rc;
1465         struct ndr sd_ndr = {0}, acl_ndr = {0};
1466         struct xattr_ntacl acl = {0};
1467         struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1468         struct dentry *dentry = path->dentry;
1469         struct inode *inode = d_inode(dentry);
1470
1471         acl.version = 4;
1472         acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1473         acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1474
1475         memcpy(acl.desc, "posix_acl", 9);
1476         acl.desc_len = 10;
1477
1478         pntsd->osidoffset =
1479                 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1480         pntsd->gsidoffset =
1481                 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1482         pntsd->dacloffset =
1483                 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1484
1485         acl.sd_buf = (char *)pntsd;
1486         acl.sd_size = len;
1487
1488         rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1489         if (rc) {
1490                 pr_err("failed to generate hash for ndr acl\n");
1491                 return rc;
1492         }
1493
1494         smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1495                                                  ACL_TYPE_ACCESS);
1496         if (S_ISDIR(inode->i_mode))
1497                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1498                                                              ACL_TYPE_DEFAULT);
1499
1500         rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode,
1501                                   smb_acl, def_smb_acl);
1502         if (rc) {
1503                 pr_err("failed to encode ndr to posix acl\n");
1504                 goto out;
1505         }
1506
1507         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1508                                acl.posix_acl_hash);
1509         if (rc) {
1510                 pr_err("failed to generate hash for ndr acl\n");
1511                 goto out;
1512         }
1513
1514         rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1515         if (rc) {
1516                 pr_err("failed to encode ndr to posix acl\n");
1517                 goto out;
1518         }
1519
1520         rc = ksmbd_vfs_setxattr(idmap, path,
1521                                 XATTR_NAME_SD, sd_ndr.data,
1522                                 sd_ndr.offset, 0, get_write);
1523         if (rc < 0)
1524                 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1525
1526         kfree(sd_ndr.data);
1527 out:
1528         kfree(acl_ndr.data);
1529         kfree(smb_acl);
1530         kfree(def_smb_acl);
1531         return rc;
1532 }
1533
1534 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1535                            struct mnt_idmap *idmap,
1536                            struct dentry *dentry,
1537                            struct smb_ntsd **pntsd)
1538 {
1539         int rc;
1540         struct ndr n;
1541         struct inode *inode = d_inode(dentry);
1542         struct ndr acl_ndr = {0};
1543         struct xattr_ntacl acl;
1544         struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1545         __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1546
1547         rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data);
1548         if (rc <= 0)
1549                 return rc;
1550
1551         n.length = rc;
1552         rc = ndr_decode_v4_ntacl(&n, &acl);
1553         if (rc)
1554                 goto free_n_data;
1555
1556         smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1557                                                  ACL_TYPE_ACCESS);
1558         if (S_ISDIR(inode->i_mode))
1559                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1560                                                              ACL_TYPE_DEFAULT);
1561
1562         rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl,
1563                                   def_smb_acl);
1564         if (rc) {
1565                 pr_err("failed to encode ndr to posix acl\n");
1566                 goto out_free;
1567         }
1568
1569         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1570         if (rc) {
1571                 pr_err("failed to generate hash for ndr acl\n");
1572                 goto out_free;
1573         }
1574
1575         if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1576                 pr_err("hash value diff\n");
1577                 rc = -EINVAL;
1578                 goto out_free;
1579         }
1580
1581         *pntsd = acl.sd_buf;
1582         if (acl.sd_size < sizeof(struct smb_ntsd)) {
1583                 pr_err("sd size is invalid\n");
1584                 goto out_free;
1585         }
1586
1587         (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1588                                            NDR_NTSD_OFFSETOF);
1589         (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1590                                            NDR_NTSD_OFFSETOF);
1591         (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1592                                            NDR_NTSD_OFFSETOF);
1593
1594         rc = acl.sd_size;
1595 out_free:
1596         kfree(acl_ndr.data);
1597         kfree(smb_acl);
1598         kfree(def_smb_acl);
1599         if (rc < 0) {
1600                 kfree(acl.sd_buf);
1601                 *pntsd = NULL;
1602         }
1603
1604 free_n_data:
1605         kfree(n.data);
1606         return rc;
1607 }
1608
1609 int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap,
1610                                    const struct path *path,
1611                                    struct xattr_dos_attrib *da,
1612                                    bool get_write)
1613 {
1614         struct ndr n;
1615         int err;
1616
1617         err = ndr_encode_dos_attr(&n, da);
1618         if (err)
1619                 return err;
1620
1621         err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE,
1622                                  (void *)n.data, n.offset, 0, get_write);
1623         if (err)
1624                 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1625         kfree(n.data);
1626
1627         return err;
1628 }
1629
1630 int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap,
1631                                    struct dentry *dentry,
1632                                    struct xattr_dos_attrib *da)
1633 {
1634         struct ndr n;
1635         int err;
1636
1637         err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1638                                  (char **)&n.data);
1639         if (err > 0) {
1640                 n.length = err;
1641                 if (ndr_decode_dos_attr(&n, da))
1642                         err = -EINVAL;
1643                 kfree(n.data);
1644         } else {
1645                 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1646         }
1647
1648         return err;
1649 }
1650
1651 /**
1652  * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1653  * @p:          destination buffer
1654  * @ksmbd_kstat:      ksmbd kstat wrapper
1655  *
1656  * Returns: pointer to the converted &struct file_directory_info
1657  */
1658 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1659 {
1660         struct file_directory_info *info = (struct file_directory_info *)(*p);
1661         struct kstat *kstat = ksmbd_kstat->kstat;
1662         u64 time;
1663
1664         info->FileIndex = 0;
1665         info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1666         time = ksmbd_UnixTimeToNT(kstat->atime);
1667         info->LastAccessTime = cpu_to_le64(time);
1668         time = ksmbd_UnixTimeToNT(kstat->mtime);
1669         info->LastWriteTime = cpu_to_le64(time);
1670         time = ksmbd_UnixTimeToNT(kstat->ctime);
1671         info->ChangeTime = cpu_to_le64(time);
1672
1673         if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1674                 info->EndOfFile = 0;
1675                 info->AllocationSize = 0;
1676         } else {
1677                 info->EndOfFile = cpu_to_le64(kstat->size);
1678                 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1679         }
1680         info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1681
1682         return info;
1683 }
1684
1685 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1686                                 struct mnt_idmap *idmap,
1687                                 struct dentry *dentry,
1688                                 struct ksmbd_kstat *ksmbd_kstat)
1689 {
1690         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1691         u64 time;
1692         int rc;
1693         struct path path = {
1694                 .mnt = share_conf->vfs_path.mnt,
1695                 .dentry = dentry,
1696         };
1697
1698         rc = vfs_getattr(&path, ksmbd_kstat->kstat,
1699                          STATX_BASIC_STATS | STATX_BTIME,
1700                          AT_STATX_SYNC_AS_STAT);
1701         if (rc)
1702                 return rc;
1703
1704         time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1705         ksmbd_kstat->create_time = time;
1706
1707         /*
1708          * set default value for the case that store dos attributes is not yes
1709          * or that acl is disable in server's filesystem and the config is yes.
1710          */
1711         if (S_ISDIR(ksmbd_kstat->kstat->mode))
1712                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1713         else
1714                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1715
1716         if (test_share_config_flag(work->tcon->share_conf,
1717                                    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1718                 struct xattr_dos_attrib da;
1719
1720                 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
1721                 if (rc > 0) {
1722                         ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1723                         ksmbd_kstat->create_time = da.create_time;
1724                 } else {
1725                         ksmbd_debug(VFS, "fail to load dos attribute.\n");
1726                 }
1727         }
1728
1729         return 0;
1730 }
1731
1732 ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap,
1733                                 struct dentry *dentry, char *attr_name,
1734                                 int attr_name_len)
1735 {
1736         char *name, *xattr_list = NULL;
1737         ssize_t value_len = -ENOENT, xattr_list_len;
1738
1739         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1740         if (xattr_list_len <= 0)
1741                 goto out;
1742
1743         for (name = xattr_list; name - xattr_list < xattr_list_len;
1744                         name += strlen(name) + 1) {
1745                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1746                 if (strncasecmp(attr_name, name, attr_name_len))
1747                         continue;
1748
1749                 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name);
1750                 break;
1751         }
1752
1753 out:
1754         kvfree(xattr_list);
1755         return value_len;
1756 }
1757
1758 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1759                                 size_t *xattr_stream_name_size, int s_type)
1760 {
1761         char *type, *buf;
1762
1763         if (s_type == DIR_STREAM)
1764                 type = ":$INDEX_ALLOCATION";
1765         else
1766                 type = ":$DATA";
1767
1768         buf = kasprintf(GFP_KERNEL, "%s%s%s",
1769                         XATTR_NAME_STREAM, stream_name, type);
1770         if (!buf)
1771                 return -ENOMEM;
1772
1773         *xattr_stream_name = buf;
1774         *xattr_stream_name_size = strlen(buf) + 1;
1775
1776         return 0;
1777 }
1778
1779 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1780                                struct ksmbd_file *src_fp,
1781                                struct ksmbd_file *dst_fp,
1782                                struct srv_copychunk *chunks,
1783                                unsigned int chunk_count,
1784                                unsigned int *chunk_count_written,
1785                                unsigned int *chunk_size_written,
1786                                loff_t *total_size_written)
1787 {
1788         unsigned int i;
1789         loff_t src_off, dst_off, src_file_size;
1790         size_t len;
1791         int ret;
1792
1793         *chunk_count_written = 0;
1794         *chunk_size_written = 0;
1795         *total_size_written = 0;
1796
1797         if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1798                 pr_err("no right to read(%pD)\n", src_fp->filp);
1799                 return -EACCES;
1800         }
1801         if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1802                 pr_err("no right to write(%pD)\n", dst_fp->filp);
1803                 return -EACCES;
1804         }
1805
1806         if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1807                 return -EBADF;
1808
1809         smb_break_all_levII_oplock(work, dst_fp, 1);
1810
1811         if (!work->tcon->posix_extensions) {
1812                 for (i = 0; i < chunk_count; i++) {
1813                         src_off = le64_to_cpu(chunks[i].SourceOffset);
1814                         dst_off = le64_to_cpu(chunks[i].TargetOffset);
1815                         len = le32_to_cpu(chunks[i].Length);
1816
1817                         if (check_lock_range(src_fp->filp, src_off,
1818                                              src_off + len - 1, READ))
1819                                 return -EAGAIN;
1820                         if (check_lock_range(dst_fp->filp, dst_off,
1821                                              dst_off + len - 1, WRITE))
1822                                 return -EAGAIN;
1823                 }
1824         }
1825
1826         src_file_size = i_size_read(file_inode(src_fp->filp));
1827
1828         for (i = 0; i < chunk_count; i++) {
1829                 src_off = le64_to_cpu(chunks[i].SourceOffset);
1830                 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1831                 len = le32_to_cpu(chunks[i].Length);
1832
1833                 if (src_off + len > src_file_size)
1834                         return -E2BIG;
1835
1836                 ret = vfs_copy_file_range(src_fp->filp, src_off,
1837                                           dst_fp->filp, dst_off, len, 0);
1838                 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1839                         ret = vfs_copy_file_range(src_fp->filp, src_off,
1840                                                   dst_fp->filp, dst_off, len,
1841                                                   COPY_FILE_SPLICE);
1842                 if (ret < 0)
1843                         return ret;
1844
1845                 *chunk_count_written += 1;
1846                 *total_size_written += ret;
1847         }
1848         return 0;
1849 }
1850
1851 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1852 {
1853         wait_event(flock->c.flc_wait, !flock->c.flc_blocker);
1854 }
1855
1856 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1857 {
1858         return wait_event_interruptible_timeout(flock->c.flc_wait,
1859                                                 !flock->c.flc_blocker,
1860                                                 timeout);
1861 }
1862
1863 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1864 {
1865         locks_delete_block(flock);
1866 }
1867
1868 int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
1869                                  struct path *path)
1870 {
1871         struct posix_acl_state acl_state;
1872         struct posix_acl *acls;
1873         struct dentry *dentry = path->dentry;
1874         struct inode *inode = d_inode(dentry);
1875         int rc;
1876
1877         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1878                 return -EOPNOTSUPP;
1879
1880         ksmbd_debug(SMB, "Set posix acls\n");
1881         rc = init_acl_state(&acl_state, 1);
1882         if (rc)
1883                 return rc;
1884
1885         /* Set default owner group */
1886         acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1887         acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1888         acl_state.other.allow = inode->i_mode & 0007;
1889         acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1890         acl_state.users->aces[acl_state.users->n++].perms.allow =
1891                 acl_state.owner.allow;
1892         acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1893         acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1894                 acl_state.group.allow;
1895         acl_state.mask.allow = 0x07;
1896
1897         acls = posix_acl_alloc(6, GFP_KERNEL);
1898         if (!acls) {
1899                 free_acl_state(&acl_state);
1900                 return -ENOMEM;
1901         }
1902         posix_state_to_acl(&acl_state, acls->a_entries);
1903
1904         rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1905         if (rc < 0)
1906                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1907                             rc);
1908         else if (S_ISDIR(inode->i_mode)) {
1909                 posix_state_to_acl(&acl_state, acls->a_entries);
1910                 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls);
1911                 if (rc < 0)
1912                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1913                                     rc);
1914         }
1915
1916         free_acl_state(&acl_state);
1917         posix_acl_release(acls);
1918         return rc;
1919 }
1920
1921 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
1922                                 struct path *path, struct inode *parent_inode)
1923 {
1924         struct posix_acl *acls;
1925         struct posix_acl_entry *pace;
1926         struct dentry *dentry = path->dentry;
1927         struct inode *inode = d_inode(dentry);
1928         int rc, i;
1929
1930         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1931                 return -EOPNOTSUPP;
1932
1933         acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT);
1934         if (IS_ERR_OR_NULL(acls))
1935                 return -ENOENT;
1936         pace = acls->a_entries;
1937
1938         for (i = 0; i < acls->a_count; i++, pace++) {
1939                 if (pace->e_tag == ACL_MASK) {
1940                         pace->e_perm = 0x07;
1941                         break;
1942                 }
1943         }
1944
1945         rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1946         if (rc < 0)
1947                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1948                             rc);
1949         if (S_ISDIR(inode->i_mode)) {
1950                 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT,
1951                                    acls);
1952                 if (rc < 0)
1953                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1954                                     rc);
1955         }
1956
1957         posix_acl_release(acls);
1958         return rc;
1959 }