1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
4 * Copyright (C) 2018 Samsung Electronics Co., Ltd.
7 #include <linux/kernel.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>
25 #include "connection.h"
27 #include "vfs_cache.h"
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"
39 static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work,
40 struct inode *parent_inode,
43 if (!test_share_config_flag(work->tcon->share_conf,
44 KSMBD_SHARE_FLAG_INHERIT_OWNER))
47 i_uid_write(inode, i_uid_read(parent_inode));
51 * ksmbd_vfs_lock_parent() - lock parent dentry if it is stable
53 int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child)
55 inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
56 if (child->d_parent != parent) {
57 inode_unlock(d_inode(parent));
64 static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf,
65 char *pathname, unsigned int flags,
69 struct filename *filename;
70 struct path *root_share_path = &share_conf->vfs_path;
72 struct path parent_path;
75 if (pathname[0] == '\0') {
76 pathname = share_conf->path;
77 root_share_path = NULL;
79 flags |= LOOKUP_BENEATH;
82 filename = getname_kernel(pathname);
84 return PTR_ERR(filename);
86 err = vfs_path_parent_lookup(filename, flags,
87 &parent_path, &last, &type,
93 if (unlikely(type != LAST_NORM)) {
94 path_put(&parent_path);
98 inode_lock_nested(parent_path.dentry->d_inode, I_MUTEX_PARENT);
99 d = lookup_one_qstr_excl(&last, parent_path.dentry, 0);
103 if (d_is_negative(d)) {
109 path->mnt = share_conf->vfs_path.mnt;
110 path_put(&parent_path);
115 inode_unlock(parent_path.dentry->d_inode);
116 path_put(&parent_path);
120 int ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap,
121 struct dentry *dentry, __le32 *daccess)
125 *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
127 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE))
128 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
129 FILE_WRITE_DATA | FILE_APPEND_DATA |
130 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
133 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ))
134 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
136 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC))
137 *daccess |= FILE_EXECUTE_LE;
139 if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE))
140 *daccess |= FILE_DELETE_LE;
146 * ksmbd_vfs_create() - vfs helper for smb create file
148 * @name: file name that is relative to share
149 * @mode: file create mode
151 * Return: 0 on success, otherwise error
153 int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
156 struct dentry *dentry;
159 dentry = ksmbd_vfs_kern_path_create(work, name,
160 LOOKUP_NO_SYMLINKS, &path);
161 if (IS_ERR(dentry)) {
162 err = PTR_ERR(dentry);
164 pr_err("path create failed for %s, err %d\n",
170 err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry),
173 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
176 pr_err("File(%s): creation failed (err:%d)\n", name, err);
178 done_path_create(&path, dentry);
183 * ksmbd_vfs_mkdir() - vfs helper for smb create directory
185 * @name: directory name that is relative to share
186 * @mode: directory create mode
188 * Return: 0 on success, otherwise error
190 int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
192 struct mnt_idmap *idmap;
194 struct dentry *dentry;
197 dentry = ksmbd_vfs_kern_path_create(work, name,
198 LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
200 if (IS_ERR(dentry)) {
201 err = PTR_ERR(dentry);
203 ksmbd_debug(VFS, "path create failed for %s, err %d\n",
208 idmap = mnt_idmap(path.mnt);
210 err = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode);
213 } else if (d_unhashed(dentry)) {
216 d = lookup_one(idmap, dentry->d_name.name, dentry->d_parent,
222 if (unlikely(d_is_negative(d))) {
228 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
232 done_path_create(&path, dentry);
234 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err);
238 static ssize_t ksmbd_vfs_getcasexattr(struct mnt_idmap *idmap,
239 struct dentry *dentry, char *attr_name,
240 int attr_name_len, char **attr_value)
242 char *name, *xattr_list = NULL;
243 ssize_t value_len = -ENOENT, xattr_list_len;
245 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
246 if (xattr_list_len <= 0)
249 for (name = xattr_list; name - xattr_list < xattr_list_len;
250 name += strlen(name) + 1) {
251 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
252 if (strncasecmp(attr_name, name, attr_name_len))
255 value_len = ksmbd_vfs_getxattr(idmap,
260 pr_err("failed to get xattr in file\n");
269 static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
273 char *stream_buf = NULL;
275 ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
278 v_len = ksmbd_vfs_getcasexattr(file_mnt_idmap(fp->filp),
279 fp->filp->f_path.dentry,
291 if (v_len - *pos < count)
292 count = v_len - *pos;
294 memcpy(buf, &stream_buf[*pos], count);
302 * check_lock_range() - vfs helper for smb byte range file locking
303 * @filp: the file to apply the lock to
304 * @start: lock start byte offset
305 * @end: lock end byte offset
306 * @type: byte range type read/write
308 * Return: 0 on success, otherwise error
310 static int check_lock_range(struct file *filp, loff_t start, loff_t end,
313 struct file_lock *flock;
314 struct file_lock_context *ctx = locks_inode_context(file_inode(filp));
317 if (!ctx || list_empty_careful(&ctx->flc_posix))
320 spin_lock(&ctx->flc_lock);
321 list_for_each_entry(flock, &ctx->flc_posix, fl_list) {
322 /* check conflict locks */
323 if (flock->fl_end >= start && end >= flock->fl_start) {
324 if (flock->fl_type == F_RDLCK) {
326 pr_err("not allow write by shared lock\n");
330 } else if (flock->fl_type == F_WRLCK) {
331 /* check owner in lock */
332 if (flock->fl_file != filp) {
334 pr_err("not allow rw access by exclusive lock from other opens\n");
341 spin_unlock(&ctx->flc_lock);
346 * ksmbd_vfs_read() - vfs helper for smb file read
348 * @fid: file id of open file
349 * @count: read byte count
352 * Return: number of read bytes on success, otherwise error
354 int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count,
357 struct file *filp = fp->filp;
359 char *rbuf = work->aux_payload_buf;
360 struct inode *inode = file_inode(filp);
362 if (S_ISDIR(inode->i_mode))
365 if (unlikely(count == 0))
368 if (work->conn->connection_type) {
369 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
370 pr_err("no right to read(%pD)\n", fp->filp);
375 if (ksmbd_stream_fd(fp))
376 return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
378 if (!work->tcon->posix_extensions) {
381 ret = check_lock_range(filp, *pos, *pos + count - 1, READ);
383 pr_err("unable to read due to lock\n");
388 nbytes = kernel_read(filp, rbuf, count, pos);
390 pr_err("smb read failed, err = %zd\n", nbytes);
398 static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
401 char *stream_buf = NULL, *wbuf;
402 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
406 ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
410 if (size > XATTR_SIZE_MAX) {
411 size = XATTR_SIZE_MAX;
412 count = (*pos + count) - XATTR_SIZE_MAX;
415 v_len = ksmbd_vfs_getcasexattr(idmap,
416 fp->filp->f_path.dentry,
420 if ((int)v_len < 0) {
421 pr_err("not found stream in xattr : %zd\n", v_len);
427 wbuf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
434 memcpy(wbuf, stream_buf, v_len);
439 memcpy(&stream_buf[*pos], buf, count);
441 err = ksmbd_vfs_setxattr(idmap,
442 fp->filp->f_path.dentry,
450 fp->filp->f_pos = *pos;
458 * ksmbd_vfs_write() - vfs helper for smb file write
460 * @fid: file id of open file
461 * @buf: buf containing data for writing
462 * @count: read byte count
464 * @sync: fsync after write
465 * @written: number of bytes written
467 * Return: 0 on success, otherwise error
469 int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
470 char *buf, size_t count, loff_t *pos, bool sync,
474 loff_t offset = *pos;
477 if (work->conn->connection_type) {
478 if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
479 pr_err("no right to write(%pD)\n", fp->filp);
487 if (ksmbd_stream_fd(fp)) {
488 err = ksmbd_vfs_stream_write(fp, buf, pos, count);
494 if (!work->tcon->posix_extensions) {
495 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
497 pr_err("unable to write due to lock\n");
503 /* Do we need to break any of a levelII oplock? */
504 smb_break_all_levII_oplock(work, fp, 1);
506 err = kernel_write(filp, buf, count, pos);
508 ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
516 err = vfs_fsync_range(filp, offset, offset + *written, 0);
518 pr_err("fsync failed for filename = %pD, err = %d\n",
527 * ksmbd_vfs_getattr() - vfs helper for smb getattr
529 * @fid: file id of open file
530 * @attrs: inode attributes
532 * Return: 0 on success, otherwise error
534 int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
538 err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
540 pr_err("getattr failed, err %d\n", err);
545 * ksmbd_vfs_fsync() - vfs helper for smb fsync
547 * @fid: file id of open file
549 * Return: 0 on success, otherwise error
551 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
553 struct ksmbd_file *fp;
556 fp = ksmbd_lookup_fd_slow(work, fid, p_id);
558 pr_err("failed to get filp for fid %llu\n", fid);
561 err = vfs_fsync(fp->filp, 0);
563 pr_err("smb fsync failed, err = %d\n", err);
564 ksmbd_fd_put(work, fp);
569 * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
570 * @name: directory or file name that is relative to share
572 * Return: 0 on success, otherwise error
574 int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)
576 struct mnt_idmap *idmap;
577 struct dentry *parent = path->dentry->d_parent;
580 if (ksmbd_override_fsids(work))
583 if (!d_inode(path->dentry)->i_nlink) {
588 idmap = mnt_idmap(path->mnt);
589 if (S_ISDIR(d_inode(path->dentry)->i_mode)) {
590 err = vfs_rmdir(idmap, d_inode(parent), path->dentry);
591 if (err && err != -ENOTEMPTY)
592 ksmbd_debug(VFS, "rmdir failed, err %d\n", err);
594 err = vfs_unlink(idmap, d_inode(parent), path->dentry, NULL);
596 ksmbd_debug(VFS, "unlink failed, err %d\n", err);
600 ksmbd_revert_fsids(work);
605 * ksmbd_vfs_link() - vfs helper for creating smb hardlink
606 * @oldname: source file name
607 * @newname: hardlink name that is relative to share
609 * Return: 0 on success, otherwise error
611 int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
614 struct path oldpath, newpath;
615 struct dentry *dentry;
618 if (ksmbd_override_fsids(work))
621 err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
623 pr_err("cannot get linux path for %s, err = %d\n",
628 dentry = ksmbd_vfs_kern_path_create(work, newname,
629 LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
631 if (IS_ERR(dentry)) {
632 err = PTR_ERR(dentry);
633 pr_err("path create err for %s, err %d\n", newname, err);
638 if (oldpath.mnt != newpath.mnt) {
639 pr_err("vfs_link failed err %d\n", err);
643 err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt),
644 d_inode(newpath.dentry),
647 ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
650 done_path_create(&newpath, dentry);
654 ksmbd_revert_fsids(work);
658 int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
659 char *newname, int flags)
661 struct dentry *old_parent, *new_dentry, *trap;
662 struct dentry *old_child = old_path->dentry;
663 struct path new_path;
664 struct qstr new_last;
665 struct renamedata rd;
667 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
668 struct ksmbd_file *parent_fp;
670 int err, lookup_flags = LOOKUP_NO_SYMLINKS;
672 if (ksmbd_override_fsids(work))
675 to = getname_kernel(newname);
682 err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH,
683 &new_path, &new_last, &new_type,
684 &share_conf->vfs_path);
688 if (old_path->mnt != new_path.mnt) {
693 trap = lock_rename_child(old_child, new_path.dentry);
695 old_parent = dget(old_child->d_parent);
696 if (d_unhashed(old_child)) {
701 parent_fp = ksmbd_lookup_fd_inode(d_inode(old_child->d_parent));
703 if (parent_fp->daccess & FILE_DELETE_LE) {
704 pr_err("parent dir is opened with delete access\n");
706 ksmbd_fd_put(work, parent_fp);
709 ksmbd_fd_put(work, parent_fp);
712 new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry,
713 lookup_flags | LOOKUP_RENAME_TARGET);
714 if (IS_ERR(new_dentry)) {
715 err = PTR_ERR(new_dentry);
719 if (d_is_symlink(new_dentry)) {
724 if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) {
729 if (old_child == trap) {
734 if (new_dentry == trap) {
739 rd.old_mnt_idmap = mnt_idmap(old_path->mnt),
740 rd.old_dir = d_inode(old_parent),
741 rd.old_dentry = old_child,
742 rd.new_mnt_idmap = mnt_idmap(new_path.mnt),
743 rd.new_dir = new_path.dentry->d_inode,
744 rd.new_dentry = new_dentry,
746 err = vfs_rename(&rd);
748 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);
754 unlock_rename(old_parent, new_path.dentry);
758 if (retry_estale(err, lookup_flags)) {
759 lookup_flags |= LOOKUP_REVAL;
765 ksmbd_revert_fsids(work);
770 * ksmbd_vfs_truncate() - vfs helper for smb file truncate
772 * @fid: file id of old file
773 * @size: truncate to given size
775 * Return: 0 on success, otherwise error
777 int ksmbd_vfs_truncate(struct ksmbd_work *work,
778 struct ksmbd_file *fp, loff_t size)
785 /* Do we need to break any of a levelII oplock? */
786 smb_break_all_levII_oplock(work, fp, 1);
788 if (!work->tcon->posix_extensions) {
789 struct inode *inode = file_inode(filp);
791 if (size < inode->i_size) {
792 err = check_lock_range(filp, size,
793 inode->i_size - 1, WRITE);
795 err = check_lock_range(filp, inode->i_size,
800 pr_err("failed due to lock\n");
805 err = vfs_truncate(&filp->f_path, size);
807 pr_err("truncate failed, err %d\n", err);
812 * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
813 * @dentry: dentry of file for listing xattrs
814 * @list: destination buffer
815 * @size: destination buffer length
817 * Return: xattr list length on success, otherwise error
819 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
824 size = vfs_listxattr(dentry, NULL, 0);
828 vlist = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
833 size = vfs_listxattr(dentry, vlist, size);
835 ksmbd_debug(VFS, "listxattr failed\n");
843 static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap,
844 struct dentry *dentry, char *xattr_name)
846 return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0);
850 * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
852 * @dentry: dentry of file for getting xattrs
853 * @xattr_name: name of xattr name to query
854 * @xattr_buf: destination buffer xattr value
856 * Return: read xattr value length on success, otherwise error
858 ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap,
859 struct dentry *dentry,
860 char *xattr_name, char **xattr_buf)
866 xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name);
870 buf = kmalloc(xattr_len + 1, GFP_KERNEL);
874 xattr_len = vfs_getxattr(idmap, dentry, xattr_name,
875 (void *)buf, xattr_len);
884 * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
885 * @idmap: idmap of the relevant mount
886 * @dentry: dentry to set XATTR at
887 * @attr_name: xattr name for setxattr
888 * @attr_value: xattr value to set
889 * @attr_size: size of xattr value
890 * @flags: destination buffer length
892 * Return: 0 on success, otherwise error
894 int ksmbd_vfs_setxattr(struct mnt_idmap *idmap,
895 struct dentry *dentry, const char *attr_name,
896 void *attr_value, size_t attr_size, int flags)
900 err = vfs_setxattr(idmap,
907 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
912 * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
913 * @filp: file pointer for IO
914 * @options: smb IO options
916 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
918 struct address_space *mapping;
920 mapping = filp->f_mapping;
922 if (!option || !mapping)
925 if (option & FILE_WRITE_THROUGH_LE) {
926 filp->f_flags |= O_SYNC;
927 } else if (option & FILE_SEQUENTIAL_ONLY_LE) {
928 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
929 spin_lock(&filp->f_lock);
930 filp->f_mode &= ~FMODE_RANDOM;
931 spin_unlock(&filp->f_lock);
932 } else if (option & FILE_RANDOM_ACCESS_LE) {
933 spin_lock(&filp->f_lock);
934 filp->f_mode |= FMODE_RANDOM;
935 spin_unlock(&filp->f_lock);
939 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
940 loff_t off, loff_t len)
942 smb_break_all_levII_oplock(work, fp, 1);
943 if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
944 return vfs_fallocate(fp->filp,
945 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
948 return vfs_fallocate(fp->filp,
949 FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
953 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
954 struct file_allocated_range_buffer *ranges,
955 unsigned int in_count, unsigned int *out_count)
957 struct file *f = fp->filp;
958 struct inode *inode = file_inode(fp->filp);
959 loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
960 loff_t extent_start, extent_end;
963 if (start > maxbytes)
970 * Shrink request scope to what the fs can actually handle.
972 if (length > maxbytes || (maxbytes - length) < start)
973 length = maxbytes - start;
975 if (start + length > inode->i_size)
976 length = inode->i_size - start;
979 end = start + length;
980 while (start < end && *out_count < in_count) {
981 extent_start = vfs_llseek(f, start, SEEK_DATA);
982 if (extent_start < 0) {
983 if (extent_start != -ENXIO)
984 ret = (int)extent_start;
988 if (extent_start >= end)
991 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
992 if (extent_end < 0) {
993 if (extent_end != -ENXIO)
994 ret = (int)extent_end;
996 } else if (extent_start >= extent_end) {
1000 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1001 ranges[(*out_count)++].length =
1002 cpu_to_le64(min(extent_end, end) - extent_start);
1010 int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap,
1011 struct dentry *dentry, char *attr_name)
1013 return vfs_removexattr(idmap, dentry, attr_name);
1016 int ksmbd_vfs_unlink(struct file *filp)
1019 struct dentry *dir, *dentry = filp->f_path.dentry;
1020 struct mnt_idmap *idmap = file_mnt_idmap(filp);
1022 dir = dget_parent(dentry);
1023 err = ksmbd_vfs_lock_parent(dir, dentry);
1028 if (S_ISDIR(d_inode(dentry)->i_mode))
1029 err = vfs_rmdir(idmap, d_inode(dir), dentry);
1031 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL);
1034 inode_unlock(d_inode(dir));
1036 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1043 static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1044 loff_t offset, u64 ino, unsigned int d_type)
1046 struct ksmbd_readdir_data *buf;
1048 buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1049 buf->dirent_count++;
1051 return buf->dirent_count <= 2;
1055 * ksmbd_vfs_empty_dir() - check for empty directory
1056 * @fp: ksmbd file pointer
1058 * Return: true if directory empty, otherwise false
1060 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1063 struct ksmbd_readdir_data readdir_data;
1065 memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1067 set_ctx_actor(&readdir_data.ctx, __dir_empty);
1068 readdir_data.dirent_count = 0;
1070 err = iterate_dir(fp->filp, &readdir_data.ctx);
1071 if (readdir_data.dirent_count > 2)
1078 static bool __caseless_lookup(struct dir_context *ctx, const char *name,
1079 int namlen, loff_t offset, u64 ino,
1080 unsigned int d_type)
1082 struct ksmbd_readdir_data *buf;
1085 buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1087 if (buf->used != namlen)
1089 if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
1090 const struct qstr q_buf = {.name = buf->private,
1092 const struct qstr q_name = {.name = name,
1095 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
1098 cmp = strncasecmp((char *)buf->private, name, namlen);
1100 memcpy((char *)buf->private, name, namlen);
1101 buf->dirent_count = 1;
1108 * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1110 * @name: filename to lookup
1111 * @namelen: filename length
1113 * Return: 0 on success, otherwise error
1115 static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
1116 size_t namelen, struct unicode_map *um)
1120 int flags = O_RDONLY | O_LARGEFILE;
1121 struct ksmbd_readdir_data readdir_data = {
1122 .ctx.actor = __caseless_lookup,
1129 dfilp = dentry_open(dir, flags, current_cred());
1131 return PTR_ERR(dfilp);
1133 ret = iterate_dir(dfilp, &readdir_data.ctx);
1134 if (readdir_data.dirent_count > 0)
1141 * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
1142 * @name: file path that is relative to share
1143 * @flags: lookup flags
1144 * @path: if lookup succeed, return path info
1145 * @caseless: caseless filename lookup
1147 * Return: 0 on success, otherwise error
1149 int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
1150 unsigned int flags, struct path *path,
1153 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1155 struct path parent_path;
1157 err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, path);
1163 size_t path_len, remain_len;
1165 filepath = kstrdup(name, GFP_KERNEL);
1169 path_len = strlen(filepath);
1170 remain_len = path_len;
1172 parent_path = share_conf->vfs_path;
1173 path_get(&parent_path);
1175 while (d_can_lookup(parent_path.dentry)) {
1176 char *filename = filepath + path_len - remain_len;
1177 char *next = strchrnul(filename, '/');
1178 size_t filename_len = next - filename;
1179 bool is_last = !next[0];
1181 if (filename_len == 0)
1184 err = ksmbd_vfs_lookup_in_dir(&parent_path, filename,
1192 err = vfs_path_lookup(share_conf->vfs_path.dentry,
1193 share_conf->vfs_path.mnt,
1201 path_put(&parent_path);
1202 parent_path = *path;
1205 remain_len -= filename_len + 1;
1210 path_put(&parent_path);
1216 err = ksmbd_vfs_lock_parent(parent_path.dentry, path->dentry);
1219 path_put(&parent_path);
1224 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1230 struct dentry *dent;
1232 abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1234 return ERR_PTR(-ENOMEM);
1236 dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1241 int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap,
1242 struct dentry *dentry)
1244 char *name, *xattr_list = NULL;
1245 ssize_t xattr_list_len;
1248 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1249 if (xattr_list_len < 0) {
1251 } else if (!xattr_list_len) {
1252 ksmbd_debug(SMB, "empty xattr in the file\n");
1256 for (name = xattr_list; name - xattr_list < xattr_list_len;
1257 name += strlen(name) + 1) {
1258 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1260 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1261 sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1262 !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1263 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1264 err = vfs_remove_acl(idmap, dentry, name);
1267 "remove acl xattr failed : %s\n", name);
1275 int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap,
1276 struct dentry *dentry)
1278 char *name, *xattr_list = NULL;
1279 ssize_t xattr_list_len;
1282 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1283 if (xattr_list_len < 0) {
1285 } else if (!xattr_list_len) {
1286 ksmbd_debug(SMB, "empty xattr in the file\n");
1290 for (name = xattr_list; name - xattr_list < xattr_list_len;
1291 name += strlen(name) + 1) {
1292 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1294 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1295 err = ksmbd_vfs_remove_xattr(idmap, dentry, name);
1297 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1305 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap,
1306 struct inode *inode,
1309 struct xattr_smb_acl *smb_acl = NULL;
1310 struct posix_acl *posix_acls;
1311 struct posix_acl_entry *pa_entry;
1312 struct xattr_acl_entry *xa_entry;
1315 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1318 posix_acls = get_inode_acl(inode, acl_type);
1322 smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1323 sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1328 smb_acl->count = posix_acls->a_count;
1329 pa_entry = posix_acls->a_entries;
1330 xa_entry = smb_acl->entries;
1331 for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1332 switch (pa_entry->e_tag) {
1334 xa_entry->type = SMB_ACL_USER;
1335 xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry);
1338 xa_entry->type = SMB_ACL_USER_OBJ;
1341 xa_entry->type = SMB_ACL_GROUP;
1342 xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry);
1345 xa_entry->type = SMB_ACL_GROUP_OBJ;
1348 xa_entry->type = SMB_ACL_OTHER;
1351 xa_entry->type = SMB_ACL_MASK;
1354 pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1358 if (pa_entry->e_perm & ACL_READ)
1359 xa_entry->perm |= SMB_ACL_READ;
1360 if (pa_entry->e_perm & ACL_WRITE)
1361 xa_entry->perm |= SMB_ACL_WRITE;
1362 if (pa_entry->e_perm & ACL_EXECUTE)
1363 xa_entry->perm |= SMB_ACL_EXECUTE;
1366 posix_acl_release(posix_acls);
1370 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1371 struct mnt_idmap *idmap,
1372 struct dentry *dentry,
1373 struct smb_ntsd *pntsd, int len)
1376 struct ndr sd_ndr = {0}, acl_ndr = {0};
1377 struct xattr_ntacl acl = {0};
1378 struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1379 struct inode *inode = d_inode(dentry);
1382 acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1383 acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1385 memcpy(acl.desc, "posix_acl", 9);
1389 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1391 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1393 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1395 acl.sd_buf = (char *)pntsd;
1398 rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1400 pr_err("failed to generate hash for ndr acl\n");
1404 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1406 if (S_ISDIR(inode->i_mode))
1407 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1410 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode,
1411 smb_acl, def_smb_acl);
1413 pr_err("failed to encode ndr to posix acl\n");
1417 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1418 acl.posix_acl_hash);
1420 pr_err("failed to generate hash for ndr acl\n");
1424 rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1426 pr_err("failed to encode ndr to posix acl\n");
1430 rc = ksmbd_vfs_setxattr(idmap, dentry,
1431 XATTR_NAME_SD, sd_ndr.data,
1434 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1438 kfree(acl_ndr.data);
1444 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1445 struct mnt_idmap *idmap,
1446 struct dentry *dentry,
1447 struct smb_ntsd **pntsd)
1451 struct inode *inode = d_inode(dentry);
1452 struct ndr acl_ndr = {0};
1453 struct xattr_ntacl acl;
1454 struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1455 __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1457 rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data);
1462 rc = ndr_decode_v4_ntacl(&n, &acl);
1466 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1468 if (S_ISDIR(inode->i_mode))
1469 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1472 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl,
1475 pr_err("failed to encode ndr to posix acl\n");
1479 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1481 pr_err("failed to generate hash for ndr acl\n");
1485 if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1486 pr_err("hash value diff\n");
1491 *pntsd = acl.sd_buf;
1492 if (acl.sd_size < sizeof(struct smb_ntsd)) {
1493 pr_err("sd size is invalid\n");
1497 (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1499 (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1501 (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1506 kfree(acl_ndr.data);
1519 int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap,
1520 struct dentry *dentry,
1521 struct xattr_dos_attrib *da)
1526 err = ndr_encode_dos_attr(&n, da);
1530 err = ksmbd_vfs_setxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1531 (void *)n.data, n.offset, 0);
1533 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1539 int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap,
1540 struct dentry *dentry,
1541 struct xattr_dos_attrib *da)
1546 err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1550 if (ndr_decode_dos_attr(&n, da))
1554 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1561 * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1562 * @p: destination buffer
1563 * @ksmbd_kstat: ksmbd kstat wrapper
1565 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1567 struct file_directory_info *info = (struct file_directory_info *)(*p);
1568 struct kstat *kstat = ksmbd_kstat->kstat;
1571 info->FileIndex = 0;
1572 info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1573 time = ksmbd_UnixTimeToNT(kstat->atime);
1574 info->LastAccessTime = cpu_to_le64(time);
1575 time = ksmbd_UnixTimeToNT(kstat->mtime);
1576 info->LastWriteTime = cpu_to_le64(time);
1577 time = ksmbd_UnixTimeToNT(kstat->ctime);
1578 info->ChangeTime = cpu_to_le64(time);
1580 if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1581 info->EndOfFile = 0;
1582 info->AllocationSize = 0;
1584 info->EndOfFile = cpu_to_le64(kstat->size);
1585 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1587 info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1592 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1593 struct mnt_idmap *idmap,
1594 struct dentry *dentry,
1595 struct ksmbd_kstat *ksmbd_kstat)
1600 generic_fillattr(idmap, d_inode(dentry), ksmbd_kstat->kstat);
1602 time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1603 ksmbd_kstat->create_time = time;
1606 * set default value for the case that store dos attributes is not yes
1607 * or that acl is disable in server's filesystem and the config is yes.
1609 if (S_ISDIR(ksmbd_kstat->kstat->mode))
1610 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1612 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1614 if (test_share_config_flag(work->tcon->share_conf,
1615 KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1616 struct xattr_dos_attrib da;
1618 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
1620 ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1621 ksmbd_kstat->create_time = da.create_time;
1623 ksmbd_debug(VFS, "fail to load dos attribute.\n");
1630 ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap,
1631 struct dentry *dentry, char *attr_name,
1634 char *name, *xattr_list = NULL;
1635 ssize_t value_len = -ENOENT, xattr_list_len;
1637 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1638 if (xattr_list_len <= 0)
1641 for (name = xattr_list; name - xattr_list < xattr_list_len;
1642 name += strlen(name) + 1) {
1643 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1644 if (strncasecmp(attr_name, name, attr_name_len))
1647 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name);
1656 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1657 size_t *xattr_stream_name_size, int s_type)
1661 if (s_type == DIR_STREAM)
1662 type = ":$INDEX_ALLOCATION";
1666 buf = kasprintf(GFP_KERNEL, "%s%s%s",
1667 XATTR_NAME_STREAM, stream_name, type);
1671 *xattr_stream_name = buf;
1672 *xattr_stream_name_size = strlen(buf) + 1;
1677 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1678 struct ksmbd_file *src_fp,
1679 struct ksmbd_file *dst_fp,
1680 struct srv_copychunk *chunks,
1681 unsigned int chunk_count,
1682 unsigned int *chunk_count_written,
1683 unsigned int *chunk_size_written,
1684 loff_t *total_size_written)
1687 loff_t src_off, dst_off, src_file_size;
1691 *chunk_count_written = 0;
1692 *chunk_size_written = 0;
1693 *total_size_written = 0;
1695 if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1696 pr_err("no right to read(%pD)\n", src_fp->filp);
1699 if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1700 pr_err("no right to write(%pD)\n", dst_fp->filp);
1704 if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1707 smb_break_all_levII_oplock(work, dst_fp, 1);
1709 if (!work->tcon->posix_extensions) {
1710 for (i = 0; i < chunk_count; i++) {
1711 src_off = le64_to_cpu(chunks[i].SourceOffset);
1712 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1713 len = le32_to_cpu(chunks[i].Length);
1715 if (check_lock_range(src_fp->filp, src_off,
1716 src_off + len - 1, READ))
1718 if (check_lock_range(dst_fp->filp, dst_off,
1719 dst_off + len - 1, WRITE))
1724 src_file_size = i_size_read(file_inode(src_fp->filp));
1726 for (i = 0; i < chunk_count; i++) {
1727 src_off = le64_to_cpu(chunks[i].SourceOffset);
1728 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1729 len = le32_to_cpu(chunks[i].Length);
1731 if (src_off + len > src_file_size)
1734 ret = vfs_copy_file_range(src_fp->filp, src_off,
1735 dst_fp->filp, dst_off, len, 0);
1736 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1737 ret = vfs_copy_file_range(src_fp->filp, src_off,
1738 dst_fp->filp, dst_off, len,
1743 *chunk_count_written += 1;
1744 *total_size_written += ret;
1749 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1751 wait_event(flock->fl_wait, !flock->fl_blocker);
1754 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1756 return wait_event_interruptible_timeout(flock->fl_wait,
1761 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1763 locks_delete_block(flock);
1766 int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
1767 struct dentry *dentry)
1769 struct posix_acl_state acl_state;
1770 struct posix_acl *acls;
1771 struct inode *inode = d_inode(dentry);
1774 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1777 ksmbd_debug(SMB, "Set posix acls\n");
1778 rc = init_acl_state(&acl_state, 1);
1782 /* Set default owner group */
1783 acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1784 acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1785 acl_state.other.allow = inode->i_mode & 0007;
1786 acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1787 acl_state.users->aces[acl_state.users->n++].perms.allow =
1788 acl_state.owner.allow;
1789 acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1790 acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1791 acl_state.group.allow;
1792 acl_state.mask.allow = 0x07;
1794 acls = posix_acl_alloc(6, GFP_KERNEL);
1796 free_acl_state(&acl_state);
1799 posix_state_to_acl(&acl_state, acls->a_entries);
1800 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1802 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1804 else if (S_ISDIR(inode->i_mode)) {
1805 posix_state_to_acl(&acl_state, acls->a_entries);
1806 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls);
1808 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1811 free_acl_state(&acl_state);
1812 posix_acl_release(acls);
1816 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
1817 struct dentry *dentry, struct inode *parent_inode)
1819 struct posix_acl *acls;
1820 struct posix_acl_entry *pace;
1821 struct inode *inode = d_inode(dentry);
1824 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1827 acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT);
1830 pace = acls->a_entries;
1832 for (i = 0; i < acls->a_count; i++, pace++) {
1833 if (pace->e_tag == ACL_MASK) {
1834 pace->e_perm = 0x07;
1839 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1841 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1843 if (S_ISDIR(inode->i_mode)) {
1844 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT,
1847 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1850 posix_acl_release(acls);