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         inode_lock_nested(parent_path->dentry->d_inode, I_MUTEX_PARENT);
 101         d = lookup_one_qstr_excl(&last, parent_path->dentry, 0);
 102         if (IS_ERR(d))
 103                 goto err_out;
 104
 105         if (d_is_negative(d)) {
 106                 dput(d);
 107                 goto err_out;
 108         }
 109
 110         path->dentry = d;
 111         path->mnt = mntget(parent_path->mnt);
 112
 113         if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) {
 114                 err = follow_down(path, 0);
 115                 if (err < 0) {
 116                         path_put(path);
 117                         goto err_out;
 118                 }
 119         }
 120
 121         putname(filename);
 122         return 0;
 123
 124 err_out:
 125         inode_unlock(d_inode(parent_path->dentry));
 126         path_put(parent_path);
 127         putname(filename);
 128         return -ENOENT;
 129 }
 130
 131 void ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap,
 132                                    struct dentry *dentry, __le32 *daccess)
 133 {
 134         *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
 135
 136         if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE))
 137                 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
 138                                 FILE_WRITE_DATA | FILE_APPEND_DATA |
 139                                 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
 140                                 FILE_DELETE_CHILD);
 141
 142         if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ))
 143                 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
 144
 145         if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC))
 146                 *daccess |= FILE_EXECUTE_LE;
 147
 148         if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE))
 149                 *daccess |= FILE_DELETE_LE;
 150 }
 151
 152 /**
 153  * ksmbd_vfs_create() - vfs helper for smb create file
 154  * @work:       work
 155  * @name:       file name that is relative to share
 156  * @mode:       file create mode
 157  *
 158  * Return:      0 on success, otherwise error
 159  */
 160 int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
 161 {
 162         struct path path;
 163         struct dentry *dentry;
 164         int err;
 165
 166         dentry = ksmbd_vfs_kern_path_create(work, name,
 167                                             LOOKUP_NO_SYMLINKS, &path);
 168         if (IS_ERR(dentry)) {
 169                 err = PTR_ERR(dentry);
 170                 if (err != -ENOENT)
 171                         pr_err("path create failed for %s, err %d\n",
 172                                name, err);
 173                 return err;
 174         }
 175
 176         err = mnt_want_write(path.mnt);
 177         if (err)
 178                 goto out_err;
 179
 180         mode |= S_IFREG;
 181         err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry),
 182                          dentry, mode, true);
 183         if (!err) {
 184                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
 185                                         d_inode(dentry));
 186         } else {
 187                 pr_err("File(%s): creation failed (err:%d)\n", name, err);
 188         }
 189         mnt_drop_write(path.mnt);
 190
 191 out_err:
 192         done_path_create(&path, dentry);
 193         return err;
 194 }
 195
 196 /**
 197  * ksmbd_vfs_mkdir() - vfs helper for smb create directory
 198  * @work:       work
 199  * @name:       directory name that is relative to share
 200  * @mode:       directory create mode
 201  *
 202  * Return:      0 on success, otherwise error
 203  */
 204 int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
 205 {
 206         struct mnt_idmap *idmap;
 207         struct path path;
 208         struct dentry *dentry;
 209         int err;
 210
 211         dentry = ksmbd_vfs_kern_path_create(work, name,
 212                                             LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
 213                                             &path);
 214         if (IS_ERR(dentry)) {
 215                 err = PTR_ERR(dentry);
 216                 if (err != -EEXIST)
 217                         ksmbd_debug(VFS, "path create failed for %s, err %d\n",
 218                                     name, err);
 219                 return err;
 220         }
 221
 222         err = mnt_want_write(path.mnt);
 223         if (err)
 224                 goto out_err2;
 225
 226         idmap = mnt_idmap(path.mnt);
 227         mode |= S_IFDIR;
 228         err = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode);
 229         if (!err && d_unhashed(dentry)) {
 230                 struct dentry *d;
 231
 232                 d = lookup_one(idmap, dentry->d_name.name, dentry->d_parent,
 233                                dentry->d_name.len);
 234                 if (IS_ERR(d)) {
 235                         err = PTR_ERR(d);
 236                         goto out_err1;
 237                 }
 238                 if (unlikely(d_is_negative(d))) {
 239                         dput(d);
 240                         err = -ENOENT;
 241                         goto out_err1;
 242                 }
 243
 244                 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
 245                 dput(d);
 246         }
 247
 248 out_err1:
 249         mnt_drop_write(path.mnt);
 250 out_err2:
 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         list_for_each_entry(flock, &ctx->flc_posix, fl_list) {
 341                 /* check conflict locks */
 342                 if (flock->fl_end >= start && end >= flock->fl_start) {
 343                         if (flock->fl_type == F_RDLCK) {
 344                                 if (type == WRITE) {
 345                                         pr_err("not allow write by shared lock\n");
 346                                         error = 1;
 347                                         goto out;
 348                                 }
 349                         } else if (flock->fl_type == F_WRLCK) {
 350                                 /* check owner in lock */
 351                                 if (flock->fl_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  * @fid:        file id of open file
 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         if (err < 0)
 468                 goto out;
 469
 470         fp->filp->f_pos = *pos;
 471         err = 0;
 472 out:
 473         kvfree(stream_buf);
 474         return err;
 475 }
 476
 477 /**
 478  * ksmbd_vfs_write() - vfs helper for smb file write
 479  * @work:       work
 480  * @fid:        file id of open file
 481  * @buf:        buf containing data for writing
 482  * @count:      read byte count
 483  * @pos:        file pos
 484  * @sync:       fsync after write
 485  * @written:    number of bytes written
 486  *
 487  * Return:      0 on success, otherwise error
 488  */
 489 int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
 490                     char *buf, size_t count, loff_t *pos, bool sync,
 491                     ssize_t *written)
 492 {
 493         struct file *filp;
 494         loff_t  offset = *pos;
 495         int err = 0;
 496
 497         if (work->conn->connection_type) {
 498                 if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
 499                         pr_err("no right to write(%pD)\n", fp->filp);
 500                         err = -EACCES;
 501                         goto out;
 502                 }
 503         }
 504
 505         filp = fp->filp;
 506
 507         if (ksmbd_stream_fd(fp)) {
 508                 err = ksmbd_vfs_stream_write(fp, buf, pos, count);
 509                 if (!err)
 510                         *written = count;
 511                 goto out;
 512         }
 513
 514         if (!work->tcon->posix_extensions) {
 515                 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
 516                 if (err) {
 517                         pr_err("unable to write due to lock\n");
 518                         err = -EAGAIN;
 519                         goto out;
 520                 }
 521         }
 522
 523         /* Do we need to break any of a levelII oplock? */
 524         smb_break_all_levII_oplock(work, fp, 1);
 525
 526         err = kernel_write(filp, buf, count, pos);
 527         if (err < 0) {
 528                 ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
 529                 goto out;
 530         }
 531
 532         filp->f_pos = *pos;
 533         *written = err;
 534         err = 0;
 535         if (sync) {
 536                 err = vfs_fsync_range(filp, offset, offset + *written, 0);
 537                 if (err < 0)
 538                         pr_err("fsync failed for filename = %pD, err = %d\n",
 539                                fp->filp, err);
 540         }
 541
 542 out:
 543         return err;
 544 }
 545
 546 /**
 547  * ksmbd_vfs_getattr() - vfs helper for smb getattr
 548  * @work:       work
 549  * @fid:        file id of open file
 550  * @attrs:      inode attributes
 551  *
 552  * Return:      0 on success, otherwise error
 553  */
 554 int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
 555 {
 556         int err;
 557
 558         err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
 559         if (err)
 560                 pr_err("getattr failed, err %d\n", err);
 561         return err;
 562 }
 563
 564 /**
 565  * ksmbd_vfs_fsync() - vfs helper for smb fsync
 566  * @work:       work
 567  * @fid:        file id of open file
 568  *
 569  * Return:      0 on success, otherwise error
 570  */
 571 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
 572 {
 573         struct ksmbd_file *fp;
 574         int err;
 575
 576         fp = ksmbd_lookup_fd_slow(work, fid, p_id);
 577         if (!fp) {
 578                 pr_err("failed to get filp for fid %llu\n", fid);
 579                 return -ENOENT;
 580         }
 581         err = vfs_fsync(fp->filp, 0);
 582         if (err < 0)
 583                 pr_err("smb fsync failed, err = %d\n", err);
 584         ksmbd_fd_put(work, fp);
 585         return err;
 586 }
 587
 588 /**
 589  * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
 590  * @name:       directory or file name that is relative to share
 591  *
 592  * Return:      0 on success, otherwise error
 593  */
 594 int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)
 595 {
 596         struct mnt_idmap *idmap;
 597         struct dentry *parent = path->dentry->d_parent;
 598         int err;
 599
 600         if (ksmbd_override_fsids(work))
 601                 return -ENOMEM;
 602
 603         if (!d_inode(path->dentry)->i_nlink) {
 604                 err = -ENOENT;
 605                 goto out_err;
 606         }
 607
 608         err = mnt_want_write(path->mnt);
 609         if (err)
 610                 goto out_err;
 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         mnt_drop_write(path->mnt);
 623
 624 out_err:
 625         ksmbd_revert_fsids(work);
 626         return err;
 627 }
 628
 629 /**
 630  * ksmbd_vfs_link() - vfs helper for creating smb hardlink
 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 = mnt_want_write(newpath.mnt);
 669         if (err)
 670                 goto out3;
 671
 672         err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt),
 673                        d_inode(newpath.dentry),
 674                        dentry, NULL);
 675         if (err)
 676                 ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
 677         mnt_drop_write(newpath.mnt);
 678
 679 out3:
 680         done_path_create(&newpath, dentry);
 681 out2:
 682         path_put(&oldpath);
 683 out1:
 684         ksmbd_revert_fsids(work);
 685         return err;
 686 }
 687
 688 int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
 689                      char *newname, int flags)
 690 {
 691         struct dentry *old_parent, *new_dentry, *trap;
 692         struct dentry *old_child = old_path->dentry;
 693         struct path new_path;
 694         struct qstr new_last;
 695         struct renamedata rd;
 696         struct filename *to;
 697         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
 698         struct ksmbd_file *parent_fp;
 699         int new_type;
 700         int err, lookup_flags = LOOKUP_NO_SYMLINKS;
 701
 702         if (ksmbd_override_fsids(work))
 703                 return -ENOMEM;
 704
 705         to = getname_kernel(newname);
 706         if (IS_ERR(to)) {
 707                 err = PTR_ERR(to);
 708                 goto revert_fsids;
 709         }
 710
 711 retry:
 712         err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH,
 713                                      &new_path, &new_last, &new_type,
 714                                      &share_conf->vfs_path);
 715         if (err)
 716                 goto out1;
 717
 718         if (old_path->mnt != new_path.mnt) {
 719                 err = -EXDEV;
 720                 goto out2;
 721         }
 722
 723         err = mnt_want_write(old_path->mnt);
 724         if (err)
 725                 goto out2;
 726
 727         trap = lock_rename_child(old_child, new_path.dentry);
 728
 729         old_parent = dget(old_child->d_parent);
 730         if (d_unhashed(old_child)) {
 731                 err = -EINVAL;
 732                 goto out3;
 733         }
 734
 735         parent_fp = ksmbd_lookup_fd_inode(d_inode(old_child->d_parent));
 736         if (parent_fp) {
 737                 if (parent_fp->daccess & FILE_DELETE_LE) {
 738                         pr_err("parent dir is opened with delete access\n");
 739                         err = -ESHARE;
 740                         ksmbd_fd_put(work, parent_fp);
 741                         goto out3;
 742                 }
 743                 ksmbd_fd_put(work, parent_fp);
 744         }
 745
 746         new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry,
 747                                           lookup_flags | LOOKUP_RENAME_TARGET);
 748         if (IS_ERR(new_dentry)) {
 749                 err = PTR_ERR(new_dentry);
 750                 goto out3;
 751         }
 752
 753         if (d_is_symlink(new_dentry)) {
 754                 err = -EACCES;
 755                 goto out4;
 756         }
 757
 758         if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) {
 759                 err = -EEXIST;
 760                 goto out4;
 761         }
 762
 763         if (old_child == trap) {
 764                 err = -EINVAL;
 765                 goto out4;
 766         }
 767
 768         if (new_dentry == trap) {
 769                 err = -ENOTEMPTY;
 770                 goto out4;
 771         }
 772
 773         rd.old_mnt_idmap        = mnt_idmap(old_path->mnt),
 774         rd.old_dir              = d_inode(old_parent),
 775         rd.old_dentry           = old_child,
 776         rd.new_mnt_idmap        = mnt_idmap(new_path.mnt),
 777         rd.new_dir              = new_path.dentry->d_inode,
 778         rd.new_dentry           = new_dentry,
 779         rd.flags                = flags,
 780         rd.delegated_inode      = NULL,
 781         err = vfs_rename(&rd);
 782         if (err)
 783                 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);
 784
 785 out4:
 786         dput(new_dentry);
 787 out3:
 788         dput(old_parent);
 789         unlock_rename(old_parent, new_path.dentry);
 790         mnt_drop_write(old_path->mnt);
 791 out2:
 792         path_put(&new_path);
 793
 794         if (retry_estale(err, lookup_flags)) {
 795                 lookup_flags |= LOOKUP_REVAL;
 796                 goto retry;
 797         }
 798 out1:
 799         putname(to);
 800 revert_fsids:
 801         ksmbd_revert_fsids(work);
 802         return err;
 803 }
 804
 805 /**
 806  * ksmbd_vfs_truncate() - vfs helper for smb file truncate
 807  * @work:       work
 808  * @fid:        file id of old file
 809  * @size:       truncate to given size
 810  *
 811  * Return:      0 on success, otherwise error
 812  */
 813 int ksmbd_vfs_truncate(struct ksmbd_work *work,
 814                        struct ksmbd_file *fp, loff_t size)
 815 {
 816         int err = 0;
 817         struct file *filp;
 818
 819         filp = fp->filp;
 820
 821         /* Do we need to break any of a levelII oplock? */
 822         smb_break_all_levII_oplock(work, fp, 1);
 823
 824         if (!work->tcon->posix_extensions) {
 825                 struct inode *inode = file_inode(filp);
 826
 827                 if (size < inode->i_size) {
 828                         err = check_lock_range(filp, size,
 829                                                inode->i_size - 1, WRITE);
 830                 } else {
 831                         err = check_lock_range(filp, inode->i_size,
 832                                                size - 1, WRITE);
 833                 }
 834
 835                 if (err) {
 836                         pr_err("failed due to lock\n");
 837                         return -EAGAIN;
 838                 }
 839         }
 840
 841         err = vfs_truncate(&filp->f_path, size);
 842         if (err)
 843                 pr_err("truncate failed, err %d\n", err);
 844         return err;
 845 }
 846
 847 /**
 848  * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
 849  * @dentry:     dentry of file for listing xattrs
 850  * @list:       destination buffer
 851  * @size:       destination buffer length
 852  *
 853  * Return:      xattr list length on success, otherwise error
 854  */
 855 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
 856 {
 857         ssize_t size;
 858         char *vlist = NULL;
 859
 860         size = vfs_listxattr(dentry, NULL, 0);
 861         if (size <= 0)
 862                 return size;
 863
 864         vlist = kvzalloc(size, GFP_KERNEL);
 865         if (!vlist)
 866                 return -ENOMEM;
 867
 868         *list = vlist;
 869         size = vfs_listxattr(dentry, vlist, size);
 870         if (size < 0) {
 871                 ksmbd_debug(VFS, "listxattr failed\n");
 872                 kvfree(vlist);
 873                 *list = NULL;
 874         }
 875
 876         return size;
 877 }
 878
 879 static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap,
 880                                    struct dentry *dentry, char *xattr_name)
 881 {
 882         return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0);
 883 }
 884
 885 /**
 886  * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
 887  * @idmap:      idmap
 888  * @dentry:     dentry of file for getting xattrs
 889  * @xattr_name: name of xattr name to query
 890  * @xattr_buf:  destination buffer xattr value
 891  *
 892  * Return:      read xattr value length on success, otherwise error
 893  */
 894 ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap,
 895                            struct dentry *dentry,
 896                            char *xattr_name, char **xattr_buf)
 897 {
 898         ssize_t xattr_len;
 899         char *buf;
 900
 901         *xattr_buf = NULL;
 902         xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name);
 903         if (xattr_len < 0)
 904                 return xattr_len;
 905
 906         buf = kmalloc(xattr_len + 1, GFP_KERNEL);
 907         if (!buf)
 908                 return -ENOMEM;
 909
 910         xattr_len = vfs_getxattr(idmap, dentry, xattr_name,
 911                                  (void *)buf, xattr_len);
 912         if (xattr_len > 0)
 913                 *xattr_buf = buf;
 914         else
 915                 kfree(buf);
 916         return xattr_len;
 917 }
 918
 919 /**
 920  * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
 921  * @idmap:      idmap of the relevant mount
 922  * @dentry:     dentry to set XATTR at
 923  * @attr_name:  xattr name for setxattr
 924  * @attr_value: xattr value to set
 925  * @attr_size:  size of xattr value
 926  * @flags:      destination buffer length
 927  *
 928  * Return:      0 on success, otherwise error
 929  */
 930 int ksmbd_vfs_setxattr(struct mnt_idmap *idmap,
 931                        const struct path *path, const char *attr_name,
 932                        void *attr_value, size_t attr_size, int flags)
 933 {
 934         int err;
 935
 936         err = mnt_want_write(path->mnt);
 937         if (err)
 938                 return err;
 939
 940         err = vfs_setxattr(idmap,
 941                            path->dentry,
 942                            attr_name,
 943                            attr_value,
 944                            attr_size,
 945                            flags);
 946         if (err)
 947                 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
 948         mnt_drop_write(path->mnt);
 949         return err;
 950 }
 951
 952 /**
 953  * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
 954  * @filp:       file pointer for IO
 955  * @options:    smb IO options
 956  */
 957 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
 958 {
 959         struct address_space *mapping;
 960
 961         mapping = filp->f_mapping;
 962
 963         if (!option || !mapping)
 964                 return;
 965
 966         if (option & FILE_WRITE_THROUGH_LE) {
 967                 filp->f_flags |= O_SYNC;
 968         } else if (option & FILE_SEQUENTIAL_ONLY_LE) {
 969                 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
 970                 spin_lock(&filp->f_lock);
 971                 filp->f_mode &= ~FMODE_RANDOM;
 972                 spin_unlock(&filp->f_lock);
 973         } else if (option & FILE_RANDOM_ACCESS_LE) {
 974                 spin_lock(&filp->f_lock);
 975                 filp->f_mode |= FMODE_RANDOM;
 976                 spin_unlock(&filp->f_lock);
 977         }
 978 }
 979
 980 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
 981                         loff_t off, loff_t len)
 982 {
 983         smb_break_all_levII_oplock(work, fp, 1);
 984         if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
 985                 return vfs_fallocate(fp->filp,
 986                                      FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
 987                                      off, len);
 988
 989         return vfs_fallocate(fp->filp,
 990                              FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
 991                              off, len);
 992 }
 993
 994 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
 995                          struct file_allocated_range_buffer *ranges,
 996                          unsigned int in_count, unsigned int *out_count)
 997 {
 998         struct file *f = fp->filp;
 999         struct inode *inode = file_inode(fp->filp);
1000         loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
1001         loff_t extent_start, extent_end;
1002         int ret = 0;
1003
1004         if (start > maxbytes)
1005                 return -EFBIG;
1006
1007         if (!in_count)
1008                 return 0;
1009
1010         /*
1011          * Shrink request scope to what the fs can actually handle.
1012          */
1013         if (length > maxbytes || (maxbytes - length) < start)
1014                 length = maxbytes - start;
1015
1016         if (start + length > inode->i_size)
1017                 length = inode->i_size - start;
1018
1019         *out_count = 0;
1020         end = start + length;
1021         while (start < end && *out_count < in_count) {
1022                 extent_start = vfs_llseek(f, start, SEEK_DATA);
1023                 if (extent_start < 0) {
1024                         if (extent_start != -ENXIO)
1025                                 ret = (int)extent_start;
1026                         break;
1027                 }
1028
1029                 if (extent_start >= end)
1030                         break;
1031
1032                 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
1033                 if (extent_end < 0) {
1034                         if (extent_end != -ENXIO)
1035                                 ret = (int)extent_end;
1036                         break;
1037                 } else if (extent_start >= extent_end) {
1038                         break;
1039                 }
1040
1041                 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1042                 ranges[(*out_count)++].length =
1043                         cpu_to_le64(min(extent_end, end) - extent_start);
1044
1045                 start = extent_end;
1046         }
1047
1048         return ret;
1049 }
1050
1051 int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap,
1052                            const struct path *path, char *attr_name)
1053 {
1054         int err;
1055
1056         err = mnt_want_write(path->mnt);
1057         if (err)
1058                 return err;
1059
1060         err = vfs_removexattr(idmap, path->dentry, attr_name);
1061         mnt_drop_write(path->mnt);
1062
1063         return err;
1064 }
1065
1066 int ksmbd_vfs_unlink(struct file *filp)
1067 {
1068         int err = 0;
1069         struct dentry *dir, *dentry = filp->f_path.dentry;
1070         struct mnt_idmap *idmap = file_mnt_idmap(filp);
1071
1072         err = mnt_want_write(filp->f_path.mnt);
1073         if (err)
1074                 return err;
1075
1076         dir = dget_parent(dentry);
1077         err = ksmbd_vfs_lock_parent(dir, dentry);
1078         if (err)
1079                 goto out;
1080         dget(dentry);
1081
1082         if (S_ISDIR(d_inode(dentry)->i_mode))
1083                 err = vfs_rmdir(idmap, d_inode(dir), dentry);
1084         else
1085                 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL);
1086
1087         dput(dentry);
1088         inode_unlock(d_inode(dir));
1089         if (err)
1090                 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1091 out:
1092         dput(dir);
1093         mnt_drop_write(filp->f_path.mnt);
1094
1095         return err;
1096 }
1097
1098 static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1099                        loff_t offset, u64 ino, unsigned int d_type)
1100 {
1101         struct ksmbd_readdir_data *buf;
1102
1103         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1104         buf->dirent_count++;
1105
1106         return buf->dirent_count <= 2;
1107 }
1108
1109 /**
1110  * ksmbd_vfs_empty_dir() - check for empty directory
1111  * @fp: ksmbd file pointer
1112  *
1113  * Return:      true if directory empty, otherwise false
1114  */
1115 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1116 {
1117         int err;
1118         struct ksmbd_readdir_data readdir_data;
1119
1120         memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1121
1122         set_ctx_actor(&readdir_data.ctx, __dir_empty);
1123         readdir_data.dirent_count = 0;
1124
1125         err = iterate_dir(fp->filp, &readdir_data.ctx);
1126         if (readdir_data.dirent_count > 2)
1127                 err = -ENOTEMPTY;
1128         else
1129                 err = 0;
1130         return err;
1131 }
1132
1133 static bool __caseless_lookup(struct dir_context *ctx, const char *name,
1134                              int namlen, loff_t offset, u64 ino,
1135                              unsigned int d_type)
1136 {
1137         struct ksmbd_readdir_data *buf;
1138         int cmp = -EINVAL;
1139
1140         buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1141
1142         if (buf->used != namlen)
1143                 return true;
1144         if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
1145                 const struct qstr q_buf = {.name = buf->private,
1146                                            .len = buf->used};
1147                 const struct qstr q_name = {.name = name,
1148                                             .len = namlen};
1149
1150                 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
1151         }
1152         if (cmp < 0)
1153                 cmp = strncasecmp((char *)buf->private, name, namlen);
1154         if (!cmp) {
1155                 memcpy((char *)buf->private, name, namlen);
1156                 buf->dirent_count = 1;
1157                 return false;
1158         }
1159         return true;
1160 }
1161
1162 /**
1163  * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1164  * @dir:        path info
1165  * @name:       filename to lookup
1166  * @namelen:    filename length
1167  *
1168  * Return:      0 on success, otherwise error
1169  */
1170 static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
1171                                    size_t namelen, struct unicode_map *um)
1172 {
1173         int ret;
1174         struct file *dfilp;
1175         int flags = O_RDONLY | O_LARGEFILE;
1176         struct ksmbd_readdir_data readdir_data = {
1177                 .ctx.actor      = __caseless_lookup,
1178                 .private        = name,
1179                 .used           = namelen,
1180                 .dirent_count   = 0,
1181                 .um             = um,
1182         };
1183
1184         dfilp = dentry_open(dir, flags, current_cred());
1185         if (IS_ERR(dfilp))
1186                 return PTR_ERR(dfilp);
1187
1188         ret = iterate_dir(dfilp, &readdir_data.ctx);
1189         if (readdir_data.dirent_count > 0)
1190                 ret = 0;
1191         fput(dfilp);
1192         return ret;
1193 }
1194
1195 /**
1196  * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
1197  * @name:       file path that is relative to share
1198  * @flags:      lookup flags
1199  * @path:       if lookup succeed, return path info
1200  * @caseless:   caseless filename lookup
1201  *
1202  * Return:      0 on success, otherwise error
1203  */
1204 int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
1205                                unsigned int flags, struct path *parent_path,
1206                                struct path *path, bool caseless)
1207 {
1208         struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1209         int err;
1210
1211         err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path,
1212                                            path);
1213         if (!err)
1214                 return 0;
1215
1216         if (caseless) {
1217                 char *filepath;
1218                 size_t path_len, remain_len;
1219
1220                 filepath = kstrdup(name, GFP_KERNEL);
1221                 if (!filepath)
1222                         return -ENOMEM;
1223
1224                 path_len = strlen(filepath);
1225                 remain_len = path_len;
1226
1227                 *parent_path = share_conf->vfs_path;
1228                 path_get(parent_path);
1229
1230                 while (d_can_lookup(parent_path->dentry)) {
1231                         char *filename = filepath + path_len - remain_len;
1232                         char *next = strchrnul(filename, '/');
1233                         size_t filename_len = next - filename;
1234                         bool is_last = !next[0];
1235
1236                         if (filename_len == 0)
1237                                 break;
1238
1239                         err = ksmbd_vfs_lookup_in_dir(parent_path, filename,
1240                                                       filename_len,
1241                                                       work->conn->um);
1242                         if (err)
1243                                 goto out2;
1244
1245                         next[0] = '\0';
1246
1247                         err = vfs_path_lookup(share_conf->vfs_path.dentry,
1248                                               share_conf->vfs_path.mnt,
1249                                               filepath,
1250                                               flags,
1251                                               path);
1252                         if (err)
1253                                 goto out2;
1254                         else if (is_last)
1255                                 goto out1;
1256                         path_put(parent_path);
1257                         *parent_path = *path;
1258
1259                         next[0] = '/';
1260                         remain_len -= filename_len + 1;
1261                 }
1262
1263                 err = -EINVAL;
1264 out2:
1265                 path_put(parent_path);
1266 out1:
1267                 kfree(filepath);
1268         }
1269
1270         if (!err) {
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 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1281                                           const char *name,
1282                                           unsigned int flags,
1283                                           struct path *path)
1284 {
1285         char *abs_name;
1286         struct dentry *dent;
1287
1288         abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1289         if (!abs_name)
1290                 return ERR_PTR(-ENOMEM);
1291
1292         dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1293         kfree(abs_name);
1294         return dent;
1295 }
1296
1297 int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap,
1298                                 const struct path *path)
1299 {
1300         char *name, *xattr_list = NULL;
1301         ssize_t xattr_list_len;
1302         int err = 0;
1303
1304         xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1305         if (xattr_list_len < 0) {
1306                 goto out;
1307         } else if (!xattr_list_len) {
1308                 ksmbd_debug(SMB, "empty xattr in the file\n");
1309                 goto out;
1310         }
1311
1312         err = mnt_want_write(path->mnt);
1313         if (err)
1314                 goto out;
1315
1316         for (name = xattr_list; name - xattr_list < xattr_list_len;
1317              name += strlen(name) + 1) {
1318                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1319
1320                 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1321                              sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1322                     !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1323                              sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1324                         err = vfs_remove_acl(idmap, path->dentry, name);
1325                         if (err)
1326                                 ksmbd_debug(SMB,
1327                                             "remove acl xattr failed : %s\n", name);
1328                 }
1329         }
1330         mnt_drop_write(path->mnt);
1331
1332 out:
1333         kvfree(xattr_list);
1334         return err;
1335 }
1336
1337 int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path)
1338 {
1339         char *name, *xattr_list = NULL;
1340         ssize_t xattr_list_len;
1341         int err = 0;
1342
1343         xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1344         if (xattr_list_len < 0) {
1345                 goto out;
1346         } else if (!xattr_list_len) {
1347                 ksmbd_debug(SMB, "empty xattr in the file\n");
1348                 goto out;
1349         }
1350
1351         for (name = xattr_list; name - xattr_list < xattr_list_len;
1352                         name += strlen(name) + 1) {
1353                 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1354
1355                 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1356                         err = ksmbd_vfs_remove_xattr(idmap, path, name);
1357                         if (err)
1358                                 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1359                 }
1360         }
1361 out:
1362         kvfree(xattr_list);
1363         return err;
1364 }
1365
1366 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap,
1367                                                             struct inode *inode,
1368                                                             int acl_type)
1369 {
1370         struct xattr_smb_acl *smb_acl = NULL;
1371         struct posix_acl *posix_acls;
1372         struct posix_acl_entry *pa_entry;
1373         struct xattr_acl_entry *xa_entry;
1374         int i;
1375
1376         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1377                 return NULL;
1378
1379         posix_acls = get_inode_acl(inode, acl_type);
1380         if (IS_ERR_OR_NULL(posix_acls))
1381                 return NULL;
1382
1383         smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1384                           sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1385                           GFP_KERNEL);
1386         if (!smb_acl)
1387                 goto out;
1388
1389         smb_acl->count = posix_acls->a_count;
1390         pa_entry = posix_acls->a_entries;
1391         xa_entry = smb_acl->entries;
1392         for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1393                 switch (pa_entry->e_tag) {
1394                 case ACL_USER:
1395                         xa_entry->type = SMB_ACL_USER;
1396                         xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry);
1397                         break;
1398                 case ACL_USER_OBJ:
1399                         xa_entry->type = SMB_ACL_USER_OBJ;
1400                         break;
1401                 case ACL_GROUP:
1402                         xa_entry->type = SMB_ACL_GROUP;
1403                         xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry);
1404                         break;
1405                 case ACL_GROUP_OBJ:
1406                         xa_entry->type = SMB_ACL_GROUP_OBJ;
1407                         break;
1408                 case ACL_OTHER:
1409                         xa_entry->type = SMB_ACL_OTHER;
1410                         break;
1411                 case ACL_MASK:
1412                         xa_entry->type = SMB_ACL_MASK;
1413                         break;
1414                 default:
1415                         pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1416                         goto out;
1417                 }
1418
1419                 if (pa_entry->e_perm & ACL_READ)
1420                         xa_entry->perm |= SMB_ACL_READ;
1421                 if (pa_entry->e_perm & ACL_WRITE)
1422                         xa_entry->perm |= SMB_ACL_WRITE;
1423                 if (pa_entry->e_perm & ACL_EXECUTE)
1424                         xa_entry->perm |= SMB_ACL_EXECUTE;
1425         }
1426 out:
1427         posix_acl_release(posix_acls);
1428         return smb_acl;
1429 }
1430
1431 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1432                            struct mnt_idmap *idmap,
1433                            const struct path *path,
1434                            struct smb_ntsd *pntsd, int len)
1435 {
1436         int rc;
1437         struct ndr sd_ndr = {0}, acl_ndr = {0};
1438         struct xattr_ntacl acl = {0};
1439         struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1440         struct dentry *dentry = path->dentry;
1441         struct inode *inode = d_inode(dentry);
1442
1443         acl.version = 4;
1444         acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1445         acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1446
1447         memcpy(acl.desc, "posix_acl", 9);
1448         acl.desc_len = 10;
1449
1450         pntsd->osidoffset =
1451                 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1452         pntsd->gsidoffset =
1453                 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1454         pntsd->dacloffset =
1455                 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1456
1457         acl.sd_buf = (char *)pntsd;
1458         acl.sd_size = len;
1459
1460         rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1461         if (rc) {
1462                 pr_err("failed to generate hash for ndr acl\n");
1463                 return rc;
1464         }
1465
1466         smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1467                                                  ACL_TYPE_ACCESS);
1468         if (S_ISDIR(inode->i_mode))
1469                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1470                                                              ACL_TYPE_DEFAULT);
1471
1472         rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode,
1473                                   smb_acl, def_smb_acl);
1474         if (rc) {
1475                 pr_err("failed to encode ndr to posix acl\n");
1476                 goto out;
1477         }
1478
1479         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1480                                acl.posix_acl_hash);
1481         if (rc) {
1482                 pr_err("failed to generate hash for ndr acl\n");
1483                 goto out;
1484         }
1485
1486         rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1487         if (rc) {
1488                 pr_err("failed to encode ndr to posix acl\n");
1489                 goto out;
1490         }
1491
1492         rc = ksmbd_vfs_setxattr(idmap, path,
1493                                 XATTR_NAME_SD, sd_ndr.data,
1494                                 sd_ndr.offset, 0);
1495         if (rc < 0)
1496                 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1497
1498         kfree(sd_ndr.data);
1499 out:
1500         kfree(acl_ndr.data);
1501         kfree(smb_acl);
1502         kfree(def_smb_acl);
1503         return rc;
1504 }
1505
1506 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1507                            struct mnt_idmap *idmap,
1508                            struct dentry *dentry,
1509                            struct smb_ntsd **pntsd)
1510 {
1511         int rc;
1512         struct ndr n;
1513         struct inode *inode = d_inode(dentry);
1514         struct ndr acl_ndr = {0};
1515         struct xattr_ntacl acl;
1516         struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1517         __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1518
1519         rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data);
1520         if (rc <= 0)
1521                 return rc;
1522
1523         n.length = rc;
1524         rc = ndr_decode_v4_ntacl(&n, &acl);
1525         if (rc)
1526                 goto free_n_data;
1527
1528         smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1529                                                  ACL_TYPE_ACCESS);
1530         if (S_ISDIR(inode->i_mode))
1531                 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1532                                                              ACL_TYPE_DEFAULT);
1533
1534         rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl,
1535                                   def_smb_acl);
1536         if (rc) {
1537                 pr_err("failed to encode ndr to posix acl\n");
1538                 goto out_free;
1539         }
1540
1541         rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1542         if (rc) {
1543                 pr_err("failed to generate hash for ndr acl\n");
1544                 goto out_free;
1545         }
1546
1547         if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1548                 pr_err("hash value diff\n");
1549                 rc = -EINVAL;
1550                 goto out_free;
1551         }
1552
1553         *pntsd = acl.sd_buf;
1554         if (acl.sd_size < sizeof(struct smb_ntsd)) {
1555                 pr_err("sd size is invalid\n");
1556                 goto out_free;
1557         }
1558
1559         (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1560                                            NDR_NTSD_OFFSETOF);
1561         (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1562                                            NDR_NTSD_OFFSETOF);
1563         (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1564                                            NDR_NTSD_OFFSETOF);
1565
1566         rc = acl.sd_size;
1567 out_free:
1568         kfree(acl_ndr.data);
1569         kfree(smb_acl);
1570         kfree(def_smb_acl);
1571         if (rc < 0) {
1572                 kfree(acl.sd_buf);
1573                 *pntsd = NULL;
1574         }
1575
1576 free_n_data:
1577         kfree(n.data);
1578         return rc;
1579 }
1580
1581 int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap,
1582                                    const struct path *path,
1583                                    struct xattr_dos_attrib *da)
1584 {
1585         struct ndr n;
1586         int err;
1587
1588         err = ndr_encode_dos_attr(&n, da);
1589         if (err)
1590                 return err;
1591
1592         err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE,
1593                                  (void *)n.data, n.offset, 0);
1594         if (err)
1595                 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1596         kfree(n.data);
1597
1598         return err;
1599 }
1600
1601 int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap,
1602                                    struct dentry *dentry,
1603                                    struct xattr_dos_attrib *da)
1604 {
1605         struct ndr n;
1606         int err;
1607
1608         err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1609                                  (char **)&n.data);
1610         if (err > 0) {
1611                 n.length = err;
1612                 if (ndr_decode_dos_attr(&n, da))
1613                         err = -EINVAL;
1614                 kfree(n.data);
1615         } else {
1616                 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1617         }
1618
1619         return err;
1620 }
1621
1622 /**
1623  * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1624  * @p:          destination buffer
1625  * @ksmbd_kstat:      ksmbd kstat wrapper
1626  */
1627 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1628 {
1629         struct file_directory_info *info = (struct file_directory_info *)(*p);
1630         struct kstat *kstat = ksmbd_kstat->kstat;
1631         u64 time;
1632
1633         info->FileIndex = 0;
1634         info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1635         time = ksmbd_UnixTimeToNT(kstat->atime);
1636         info->LastAccessTime = cpu_to_le64(time);
1637         time = ksmbd_UnixTimeToNT(kstat->mtime);
1638         info->LastWriteTime = cpu_to_le64(time);
1639         time = ksmbd_UnixTimeToNT(kstat->ctime);
1640         info->ChangeTime = cpu_to_le64(time);
1641
1642         if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1643                 info->EndOfFile = 0;
1644                 info->AllocationSize = 0;
1645         } else {
1646                 info->EndOfFile = cpu_to_le64(kstat->size);
1647                 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1648         }
1649         info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1650
1651         return info;
1652 }
1653
1654 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1655                                 struct mnt_idmap *idmap,
1656                                 struct dentry *dentry,
1657                                 struct ksmbd_kstat *ksmbd_kstat)
1658 {
1659         u64 time;
1660         int rc;
1661
1662         generic_fillattr(idmap, STATX_BASIC_STATS, d_inode(dentry),
1663                          ksmbd_kstat->kstat);
1664
1665         time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1666         ksmbd_kstat->create_time = time;
1667
1668         /*
1669          * set default value for the case that store dos attributes is not yes
1670          * or that acl is disable in server's filesystem and the config is yes.
1671          */
1672         if (S_ISDIR(ksmbd_kstat->kstat->mode))
1673                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1674         else
1675                 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1676
1677         if (test_share_config_flag(work->tcon->share_conf,
1678                                    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1679                 struct xattr_dos_attrib da;
1680
1681                 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
1682                 if (rc > 0) {
1683                         ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1684                         ksmbd_kstat->create_time = da.create_time;
1685                 } else {
1686                         ksmbd_debug(VFS, "fail to load dos attribute.\n");
1687                 }
1688         }
1689
1690         return 0;
1691 }
1692
1693 ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap,
1694                                 struct dentry *dentry, char *attr_name,
1695                                 int attr_name_len)
1696 {
1697         char *name, *xattr_list = NULL;
1698         ssize_t value_len = -ENOENT, xattr_list_len;
1699
1700         xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1701         if (xattr_list_len <= 0)
1702                 goto out;
1703
1704         for (name = xattr_list; name - xattr_list < xattr_list_len;
1705                         name += strlen(name) + 1) {
1706                 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1707                 if (strncasecmp(attr_name, name, attr_name_len))
1708                         continue;
1709
1710                 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name);
1711                 break;
1712         }
1713
1714 out:
1715         kvfree(xattr_list);
1716         return value_len;
1717 }
1718
1719 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1720                                 size_t *xattr_stream_name_size, int s_type)
1721 {
1722         char *type, *buf;
1723
1724         if (s_type == DIR_STREAM)
1725                 type = ":$INDEX_ALLOCATION";
1726         else
1727                 type = ":$DATA";
1728
1729         buf = kasprintf(GFP_KERNEL, "%s%s%s",
1730                         XATTR_NAME_STREAM, stream_name, type);
1731         if (!buf)
1732                 return -ENOMEM;
1733
1734         *xattr_stream_name = buf;
1735         *xattr_stream_name_size = strlen(buf) + 1;
1736
1737         return 0;
1738 }
1739
1740 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1741                                struct ksmbd_file *src_fp,
1742                                struct ksmbd_file *dst_fp,
1743                                struct srv_copychunk *chunks,
1744                                unsigned int chunk_count,
1745                                unsigned int *chunk_count_written,
1746                                unsigned int *chunk_size_written,
1747                                loff_t *total_size_written)
1748 {
1749         unsigned int i;
1750         loff_t src_off, dst_off, src_file_size;
1751         size_t len;
1752         int ret;
1753
1754         *chunk_count_written = 0;
1755         *chunk_size_written = 0;
1756         *total_size_written = 0;
1757
1758         if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1759                 pr_err("no right to read(%pD)\n", src_fp->filp);
1760                 return -EACCES;
1761         }
1762         if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1763                 pr_err("no right to write(%pD)\n", dst_fp->filp);
1764                 return -EACCES;
1765         }
1766
1767         if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1768                 return -EBADF;
1769
1770         smb_break_all_levII_oplock(work, dst_fp, 1);
1771
1772         if (!work->tcon->posix_extensions) {
1773                 for (i = 0; i < chunk_count; i++) {
1774                         src_off = le64_to_cpu(chunks[i].SourceOffset);
1775                         dst_off = le64_to_cpu(chunks[i].TargetOffset);
1776                         len = le32_to_cpu(chunks[i].Length);
1777
1778                         if (check_lock_range(src_fp->filp, src_off,
1779                                              src_off + len - 1, READ))
1780                                 return -EAGAIN;
1781                         if (check_lock_range(dst_fp->filp, dst_off,
1782                                              dst_off + len - 1, WRITE))
1783                                 return -EAGAIN;
1784                 }
1785         }
1786
1787         src_file_size = i_size_read(file_inode(src_fp->filp));
1788
1789         for (i = 0; i < chunk_count; i++) {
1790                 src_off = le64_to_cpu(chunks[i].SourceOffset);
1791                 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1792                 len = le32_to_cpu(chunks[i].Length);
1793
1794                 if (src_off + len > src_file_size)
1795                         return -E2BIG;
1796
1797                 ret = vfs_copy_file_range(src_fp->filp, src_off,
1798                                           dst_fp->filp, dst_off, len, 0);
1799                 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1800                         ret = vfs_copy_file_range(src_fp->filp, src_off,
1801                                                   dst_fp->filp, dst_off, len,
1802                                                   COPY_FILE_SPLICE);
1803                 if (ret < 0)
1804                         return ret;
1805
1806                 *chunk_count_written += 1;
1807                 *total_size_written += ret;
1808         }
1809         return 0;
1810 }
1811
1812 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1813 {
1814         wait_event(flock->fl_wait, !flock->fl_blocker);
1815 }
1816
1817 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1818 {
1819         return wait_event_interruptible_timeout(flock->fl_wait,
1820                                                 !flock->fl_blocker,
1821                                                 timeout);
1822 }
1823
1824 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1825 {
1826         locks_delete_block(flock);
1827 }
1828
1829 int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
1830                                  struct path *path)
1831 {
1832         struct posix_acl_state acl_state;
1833         struct posix_acl *acls;
1834         struct dentry *dentry = path->dentry;
1835         struct inode *inode = d_inode(dentry);
1836         int rc;
1837
1838         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1839                 return -EOPNOTSUPP;
1840
1841         ksmbd_debug(SMB, "Set posix acls\n");
1842         rc = init_acl_state(&acl_state, 1);
1843         if (rc)
1844                 return rc;
1845
1846         /* Set default owner group */
1847         acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1848         acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1849         acl_state.other.allow = inode->i_mode & 0007;
1850         acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1851         acl_state.users->aces[acl_state.users->n++].perms.allow =
1852                 acl_state.owner.allow;
1853         acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1854         acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1855                 acl_state.group.allow;
1856         acl_state.mask.allow = 0x07;
1857
1858         acls = posix_acl_alloc(6, GFP_KERNEL);
1859         if (!acls) {
1860                 free_acl_state(&acl_state);
1861                 return -ENOMEM;
1862         }
1863         posix_state_to_acl(&acl_state, acls->a_entries);
1864
1865         rc = mnt_want_write(path->mnt);
1866         if (rc)
1867                 goto out_err;
1868
1869         rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1870         if (rc < 0)
1871                 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1872                             rc);
1873         else if (S_ISDIR(inode->i_mode)) {
1874                 posix_state_to_acl(&acl_state, acls->a_entries);
1875                 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls);
1876                 if (rc < 0)
1877                         ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1878                                     rc);
1879         }
1880         mnt_drop_write(path->mnt);
1881
1882 out_err:
1883         free_acl_state(&acl_state);
1884         posix_acl_release(acls);
1885         return rc;
1886 }
1887
1888 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
1889                                 struct path *path, struct inode *parent_inode)
1890 {
1891         struct posix_acl *acls;
1892         struct posix_acl_entry *pace;
1893         struct dentry *dentry = path->dentry;
1894         struct inode *inode = d_inode(dentry);
1895         int rc, i;
1896
1897         if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1898                 return -EOPNOTSUPP;
1899
1900         acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT);
1901         if (IS_ERR_OR_NULL(acls))
1902                 return -ENOENT;
1903         pace = acls->a_entries;
1904
1905         for (i = 0; i < acls->a_count; i++, pace++) {
1906                 if (pace->e_tag == ACL_MASK) {
1907                         pace->e_perm = 0x07;
1908                         break;
1909                 }
1910         }
1911
1912         rc = mnt_want_write(path->mnt);
1913         if (rc)
1914                 goto out_err;
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         mnt_drop_write(path->mnt);
1928
1929 out_err:
1930         posix_acl_release(acls);
1931         return rc;
1932 }