cifsd: add file operations

This adds file operations and buffer pool for cifsd.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

1 files changed, 1989 insertions, 0 deletions

diff --git a/fs/cifsd/vfs.c b/fs/cifsd/vfs.c
new file mode 100644
index 000000000000..00f80ca45690
--- /dev/null
+++ b/fs/cifsd/vfs.c
@@ -0,0 +1,1989 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *   Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
+ *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/backing-dev.h>
+#include <linux/writeback.h>
+#include <linux/version.h>
+#include <linux/xattr.h>
+#include <linux/falloc.h>
+#include <linux/genhd.h>
+#include <linux/blkdev.h>
+#include <linux/fsnotify.h>
+#include <linux/dcache.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/sched/xacct.h>
+#include <linux/crc32c.h>
+
+#include "glob.h"
+#include "oplock.h"
+#include "connection.h"
+#include "buffer_pool.h"
+#include "vfs.h"
+#include "vfs_cache.h"
+#include "smbacl.h"
+#include "ndr.h"
+#include "auth.h"
+
+#include "time_wrappers.h"
+#include "smb_common.h"
+#include "mgmt/share_config.h"
+#include "mgmt/tree_connect.h"
+#include "mgmt/user_session.h"
+#include "mgmt/user_config.h"
+
+static char *extract_last_component(char *path)
+{
+	char *p = strrchr(path, '/');
+
+	if (p && p[1] != '\0') {
+		*p = '\0';
+		p++;
+	} else {
+		p = NULL;
+		ksmbd_err("Invalid path %s\n", path);
+	}
+	return p;
+}
+
+static void rollback_path_modification(char *filename)
+{
+	if (filename) {
+		filename--;
+		*filename = '/';
+	}
+}
+
+static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work,
+				    struct inode *parent_inode,
+				    struct inode *inode)
+{
+	if (!test_share_config_flag(work->tcon->share_conf,
+				   KSMBD_SHARE_FLAG_INHERIT_OWNER))
+		return;
+
+	i_uid_write(inode, i_uid_read(parent_inode));
+}
+
+static void ksmbd_vfs_inherit_smack(struct ksmbd_work *work,
+				    struct dentry *dir_dentry,
+				    struct dentry *dentry)
+{
+	char *name, *xattr_list = NULL, *smack_buf;
+	int value_len, xattr_list_len;
+
+	if (!test_share_config_flag(work->tcon->share_conf,
+				    KSMBD_SHARE_FLAG_INHERIT_SMACK))
+		return;
+
+	xattr_list_len = ksmbd_vfs_listxattr(dir_dentry, &xattr_list);
+	if (xattr_list_len < 0) {
+		goto out;
+	} else if (!xattr_list_len) {
+		ksmbd_err("no ea data in the file\n");
+		return;
+	}
+
+	for (name = xattr_list; name - xattr_list < xattr_list_len;
+			name += strlen(name) + 1) {
+		int rc;
+
+		ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
+		if (strcmp(name, XATTR_NAME_SMACK))
+			continue;
+
+		value_len = ksmbd_vfs_getxattr(dir_dentry, name, &smack_buf);
+		if (value_len <= 0)
+			continue;
+
+		rc = ksmbd_vfs_setxattr(dentry, XATTR_NAME_SMACK, smack_buf,
+					value_len, 0);
+		ksmbd_free(smack_buf);
+		if (rc < 0)
+			ksmbd_err("ksmbd_vfs_setxattr() failed: %d\n", rc);
+	}
+out:
+	ksmbd_vfs_xattr_free(xattr_list);
+}
+
+int ksmbd_vfs_inode_permission(struct dentry *dentry, int acc_mode, bool delete)
+{
+	int mask;
+
+	mask = 0;
+	acc_mode &= O_ACCMODE;
+
+	if (acc_mode == O_RDONLY)
+		mask = MAY_READ;
+	else if (acc_mode == O_WRONLY)
+		mask = MAY_WRITE;
+	else if (acc_mode == O_RDWR)
+		mask = MAY_READ | MAY_WRITE;
+
+	if (inode_permission(&init_user_ns, d_inode(dentry), mask | MAY_OPEN))
+		return -EACCES;
+
+	if (delete) {
+		struct dentry *parent;
+
+		parent = dget_parent(dentry);
+		if (!parent)
+			return -EINVAL;
+
+		if (inode_permission(&init_user_ns, d_inode(parent), MAY_EXEC | MAY_WRITE)) {
+			dput(parent);
+			return -EACCES;
+		}
+		dput(parent);
+	}
+	return 0;
+}
+
+int ksmbd_vfs_query_maximal_access(struct dentry *dentry, __le32 *daccess)
+{
+	struct dentry *parent;
+
+	*daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
+
+	if (!inode_permission(&init_user_ns, d_inode(dentry), MAY_OPEN | MAY_WRITE))
+		*daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
+				FILE_WRITE_DATA | FILE_APPEND_DATA |
+				FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
+				FILE_DELETE_CHILD);
+
+	if (!inode_permission(&init_user_ns, d_inode(dentry), MAY_OPEN | MAY_READ))
+		*daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
+
+	if (!inode_permission(&init_user_ns, d_inode(dentry), MAY_OPEN | MAY_EXEC))
+		*daccess |= FILE_EXECUTE_LE;
+
+	parent = dget_parent(dentry);
+	if (!parent)
+		return 0;
+
+	if (!inode_permission(&init_user_ns, d_inode(parent), MAY_EXEC | MAY_WRITE))
+		*daccess |= FILE_DELETE_LE;
+	dput(parent);
+	return 0;
+}
+
+
+/**
+ * ksmbd_vfs_create() - vfs helper for smb create file
+ * @work:	work
+ * @name:	file name
+ * @mode:	file create mode
+ *
+ * Return:	0 on success, otherwise error
+ */
+int ksmbd_vfs_create(struct ksmbd_work *work,
+		     const char *name,
+		     umode_t mode)
+{
+	struct path path;
+	struct dentry *dentry;
+	int err;
+
+	dentry = kern_path_create(AT_FDCWD, name, &path, 0);
+	if (IS_ERR(dentry)) {
+		err = PTR_ERR(dentry);
+		if (err != -ENOENT)
+			ksmbd_err("path create failed for %s, err %d\n",
+				name, err);
+		return err;
+	}
+
+	mode |= S_IFREG;
+	err = vfs_create(&init_user_ns, d_inode(path.dentry), dentry, mode, true);
+	if (!err) {
+		ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
+			d_inode(dentry));
+		ksmbd_vfs_inherit_smack(work, path.dentry, dentry);
+	} else {
+		ksmbd_err("File(%s): creation failed (err:%d)\n", name, err);
+	}
+	done_path_create(&path, dentry);
+	return err;
+}
+
+/**
+ * ksmbd_vfs_mkdir() - vfs helper for smb create directory
+ * @work:	work
+ * @name:	directory name
+ * @mode:	directory create mode
+ *
+ * Return:	0 on success, otherwise error
+ */
+int ksmbd_vfs_mkdir(struct ksmbd_work *work,
+		    const char *name,
+		    umode_t mode)
+{
+	struct path path;
+	struct dentry *dentry;
+	int err;
+
+	dentry = kern_path_create(AT_FDCWD, name, &path, LOOKUP_DIRECTORY);
+	if (IS_ERR(dentry)) {
+		err = PTR_ERR(dentry);
+		if (err != -EEXIST)
+			ksmbd_debug(VFS, "path create failed for %s, err %d\n",
+					name, err);
+		return err;
+	}
+
+	mode |= S_IFDIR;
+	err = vfs_mkdir(&init_user_ns, d_inode(path.dentry), dentry, mode);
+	if (!err) {
+		ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
+			d_inode(dentry));
+		ksmbd_vfs_inherit_smack(work, path.dentry, dentry);
+	} else
+		ksmbd_err("mkdir(%s): creation failed (err:%d)\n", name, err);
+
+	done_path_create(&path, dentry);
+	return err;
+}
+
+static ssize_t ksmbd_vfs_getcasexattr(struct dentry *dentry,
+				      char *attr_name,
+				      int attr_name_len,
+				      char **attr_value)
+{
+	char *name, *xattr_list = NULL;
+	ssize_t value_len = -ENOENT, xattr_list_len;
+
+	xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
+	if (xattr_list_len <= 0)
+		goto out;
+
+	for (name = xattr_list; name - xattr_list < xattr_list_len;
+			name += strlen(name) + 1) {
+		ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
+		if (strncasecmp(attr_name, name, attr_name_len))
+			continue;
+
+		value_len = ksmbd_vfs_getxattr(dentry,
+					       name,
+					       attr_value);
+		if (value_len < 0)
+			ksmbd_err("failed to get xattr in file\n");
+		break;
+	}
+
+out:
+	ksmbd_vfs_xattr_free(xattr_list);
+	return value_len;
+}
+
+static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
+	size_t count)
+{
+	ssize_t v_len;
+	char *stream_buf = NULL;
+	int err;
+
+	ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
+			*pos, count);
+
+	v_len = ksmbd_vfs_getcasexattr(fp->filp->f_path.dentry,
+				       fp->stream.name,
+				       fp->stream.size,
+				       &stream_buf);
+	if (v_len == -ENOENT) {
+		ksmbd_err("not found stream in xattr : %zd\n", v_len);
+		err = -ENOENT;
+		return err;
+	}
+
+	memcpy(buf, &stream_buf[*pos], count);
+	return v_len > count ? count : v_len;
+}
+
+/**
+ * check_lock_range() - vfs helper for smb byte range file locking
+ * @filp:	the file to apply the lock to
+ * @start:	lock start byte offset
+ * @end:	lock end byte offset
+ * @type:	byte range type read/write
+ *
+ * Return:	0 on success, otherwise error
+ */
+static int check_lock_range(struct file *filp,
+			    loff_t start,
+			    loff_t end,
+			    unsigned char type)
+{
+	struct file_lock *flock;
+	struct file_lock_context *ctx = file_inode(filp)->i_flctx;
+	int error = 0;
+
+	if (!ctx || list_empty_careful(&ctx->flc_posix))
+		return 0;
+
+	spin_lock(&ctx->flc_lock);
+	list_for_each_entry(flock, &ctx->flc_posix, fl_list) {
+		/* check conflict locks */
+		if (flock->fl_end >= start && end >= flock->fl_start) {
+			if (flock->fl_type == F_RDLCK) {
+				if (type == WRITE) {
+					ksmbd_err("not allow write by shared lock\n");
+					error = 1;
+					goto out;
+				}
+			} else if (flock->fl_type == F_WRLCK) {
+				/* check owner in lock */
+				if (flock->fl_file != filp) {
+					error = 1;
+					ksmbd_err("not allow rw access by exclusive lock from other opens\n");
+					goto out;
+				}
+			}
+		}
+	}
+out:
+	spin_unlock(&ctx->flc_lock);
+	return error;
+}
+
+/**
+ * ksmbd_vfs_read() - vfs helper for smb file read
+ * @work:	smb work
+ * @fid:	file id of open file
+ * @count:	read byte count
+ * @pos:	file pos
+ *
+ * Return:	number of read bytes on success, otherwise error
+ */
+int ksmbd_vfs_read(struct ksmbd_work *work,
+		 struct ksmbd_file *fp,
+		 size_t count,
+		 loff_t *pos)
+{
+	struct file *filp;
+	ssize_t nbytes = 0;
+	char *rbuf, *name;
+	struct inode *inode;
+	char namebuf[NAME_MAX];
+	int ret;
+
+	rbuf = AUX_PAYLOAD(work);
+	filp = fp->filp;
+	inode = d_inode(filp->f_path.dentry);
+	if (S_ISDIR(inode->i_mode))
+		return -EISDIR;
+
+	if (unlikely(count == 0))
+		return 0;
+
+	if (work->conn->connection_type) {
+		if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
+			ksmbd_err("no right to read(%s)\n", FP_FILENAME(fp));
+			return -EACCES;
+		}
+	}
+
+	if (ksmbd_stream_fd(fp))
+		return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
+
+	ret = check_lock_range(filp, *pos, *pos + count - 1,
+			READ);
+	if (ret) {
+		ksmbd_err("unable to read due to lock\n");
+		return -EAGAIN;
+	}
+
+	nbytes = kernel_read(filp, rbuf, count, pos);
+	if (nbytes < 0) {
+		name = d_path(&filp->f_path, namebuf, sizeof(namebuf));
+		if (IS_ERR(name))
+			name = "(error)";
+		ksmbd_err("smb read failed for (%s), err = %zd\n",
+				name, nbytes);
+		return nbytes;
+	}
+
+	filp->f_pos = *pos;
+	return nbytes;
+}
+
+static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
+	size_t count)
+{
+	char *stream_buf = NULL, *wbuf;
+	size_t size, v_len;
+	int err = 0;
+
+	ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
+			*pos, count);
+
+	size = *pos + count;
+	if (size > XATTR_SIZE_MAX) {
+		size = XATTR_SIZE_MAX;
+		count = (*pos + count) - XATTR_SIZE_MAX;
+	}
+
+	v_len = ksmbd_vfs_getcasexattr(fp->filp->f_path.dentry,
+				       fp->stream.name,
+				       fp->stream.size,
+				       &stream_buf);
+	if (v_len == -ENOENT) {
+		ksmbd_err("not found stream in xattr : %zd\n", v_len);
+		err = -ENOENT;
+		goto out;
+	}
+
+	if (v_len < size) {
+		wbuf = ksmbd_alloc(size);
+		if (!wbuf) {
+			err = -ENOMEM;
+			goto out;
+		}
+
+		if (v_len > 0)
+			memcpy(wbuf, stream_buf, v_len);
+		stream_buf = wbuf;
+	}
+
+	memcpy(&stream_buf[*pos], buf, count);
+
+	err = ksmbd_vfs_setxattr(fp->filp->f_path.dentry,
+				 fp->stream.name,
+				 (void *)stream_buf,
+				 size,
+				 0);
+	if (err < 0)
+		goto out;
+
+	fp->filp->f_pos = *pos;
+	err = 0;
+out:
+	ksmbd_free(stream_buf);
+	return err;
+}
+
+/**
+ * ksmbd_vfs_write() - vfs helper for smb file write
+ * @work:	work
+ * @fid:	file id of open file
+ * @buf:	buf containing data for writing
+ * @count:	read byte count
+ * @pos:	file pos
+ * @sync:	fsync after write
+ * @written:	number of bytes written
+ *
+ * Return:	0 on success, otherwise error
+ */
+int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
+	char *buf, size_t count, loff_t *pos, bool sync, ssize_t *written)
+{
+	struct ksmbd_session *sess = work->sess;
+	struct file *filp;
+	loff_t	offset = *pos;
+	int err = 0;
+
+	if (sess->conn->connection_type) {
+		if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
+			ksmbd_err("no right to write(%s)\n", FP_FILENAME(fp));
+			err = -EACCES;
+			goto out;
+		}
+	}
+
+	filp = fp->filp;
+
+	if (ksmbd_stream_fd(fp)) {
+		err = ksmbd_vfs_stream_write(fp, buf, pos, count);
+		if (!err)
+			*written = count;
+		goto out;
+	}
+
+	err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
+	if (err) {
+		ksmbd_err("unable to write due to lock\n");
+		err = -EAGAIN;
+		goto out;
+	}
+
+	/* Do we need to break any of a levelII oplock? */
+	smb_break_all_levII_oplock(work, fp, 1);
+
+	err = kernel_write(filp, buf, count, pos);
+	if (err < 0) {
+		ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
+		goto out;
+	}
+
+	filp->f_pos = *pos;
+	*written = err;
+	err = 0;
+	if (sync) {
+		err = vfs_fsync_range(filp, offset, offset + *written, 0);
+		if (err < 0)
+			ksmbd_err("fsync failed for filename = %s, err = %d\n",
+					FP_FILENAME(fp), err);
+	}
+
+out:
+	return err;
+}
+
+/**
+ * ksmbd_vfs_getattr() - vfs helper for smb getattr
+ * @work:	work
+ * @fid:	file id of open file
+ * @attrs:	inode attributes
+ *
+ * Return:	0 on success, otherwise error
+ */
+int ksmbd_vfs_getattr(struct path *path, struct kstat *stat)
+{
+	int err;
+
+	err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
+	if (err)
+		ksmbd_err("getattr failed, err %d\n", err);
+	return err;
+}
+
+/**
+ * ksmbd_vfs_fsync() - vfs helper for smb fsync
+ * @work:	work
+ * @fid:	file id of open file
+ *
+ * Return:	0 on success, otherwise error
+ */
+int ksmbd_vfs_fsync(struct ksmbd_work *work, uint64_t fid, uint64_t p_id)
+{
+	struct ksmbd_file *fp;
+	int err;
+
+	fp = ksmbd_lookup_fd_slow(work, fid, p_id);
+	if (!fp) {
+		ksmbd_err("failed to get filp for fid %llu\n", fid);
+		return -ENOENT;
+	}
+	err = vfs_fsync(fp->filp, 0);
+	if (err < 0)
+		ksmbd_err("smb fsync failed, err = %d\n", err);
+	ksmbd_fd_put(work, fp);
+	return err;
+}
+
+/**
+ * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
+ * @name:	absolute directory or file name
+ *
+ * Return:	0 on success, otherwise error
+ */
+int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name)
+{
+	struct path parent;
+	struct dentry *dir, *dentry;
+	char *last;
+	int err = -ENOENT;
+
+	last = extract_last_component(name);
+	if (!last)
+		return -ENOENT;
+
+	if (ksmbd_override_fsids(work))
+		return -ENOMEM;
+
+	err = kern_path(name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &parent);
+	if (err) {
+		ksmbd_debug(VFS, "can't get %s, err %d\n", name, err);
+		ksmbd_revert_fsids(work);
+		rollback_path_modification(last);
+		return err;
+	}
+
+	dir = parent.dentry;
+	if (!d_inode(dir))
+		goto out;
+
+	inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
+	dentry = lookup_one_len(last, dir, strlen(last));
+	if (IS_ERR(dentry)) {
+		err = PTR_ERR(dentry);
+		ksmbd_debug(VFS, "%s: lookup failed, err %d\n", last, err);
+		goto out_err;
+	}
+
+	if (!d_inode(dentry) || !d_inode(dentry)->i_nlink) {
+		dput(dentry);
+		err = -ENOENT;
+		goto out_err;
+	}
+
+	if (S_ISDIR(d_inode(dentry)->i_mode)) {
+		err = vfs_rmdir(&init_user_ns, d_inode(dir), dentry);
+		if (err && err != -ENOTEMPTY)
+			ksmbd_debug(VFS, "%s: rmdir failed, err %d\n", name,
+				err);
+	} else {
+		err = vfs_unlink(&init_user_ns, d_inode(dir), dentry, NULL);
+		if (err)
+			ksmbd_debug(VFS, "%s: unlink failed, err %d\n", name,
+				err);
+	}
+
+	dput(dentry);
+out_err:
+	inode_unlock(d_inode(dir));
+out:
+	rollback_path_modification(last);
+	path_put(&parent);
+	ksmbd_revert_fsids(work);
+	return err;
+}
+
+/**
+ * ksmbd_vfs_link() - vfs helper for creating smb hardlink
+ * @oldname:	source file name
+ * @newname:	hardlink name
+ *
+ * Return:	0 on success, otherwise error
+ */
+int ksmbd_vfs_link(struct ksmbd_work *work,
+		const char *oldname, const char *newname)
+{
+	struct path oldpath, newpath;
+	struct dentry *dentry;
+	int err;
+
+	if (ksmbd_override_fsids(work))
+		return -ENOMEM;
+
+	err = kern_path(oldname, LOOKUP_FOLLOW, &oldpath);
+	if (err) {
+		ksmbd_err("cannot get linux path for %s, err = %d\n",
+				oldname, err);
+		goto out1;
+	}
+
+	dentry = kern_path_create(AT_FDCWD, newname, &newpath,
+			LOOKUP_FOLLOW | LOOKUP_REVAL);
+	if (IS_ERR(dentry)) {
+		err = PTR_ERR(dentry);
+		ksmbd_err("path create err for %s, err %d\n", newname, err);
+		goto out2;
+	}
+
+	err = -EXDEV;
+	if (oldpath.mnt != newpath.mnt) {
+		ksmbd_err("vfs_link failed err %d\n", err);
+		goto out3;
+	}
+
+	err = vfs_link(oldpath.dentry, &init_user_ns, d_inode(newpath.dentry),
+			dentry, NULL);
+	if (err)
+		ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
+
+out3:
+	done_path_create(&newpath, dentry);
+out2:
+	path_put(&oldpath);
+out1:
+	ksmbd_revert_fsids(work);
+	return err;
+}
+
+static int __ksmbd_vfs_rename(struct ksmbd_work *work,
+			      struct dentry *src_dent_parent,
+			      struct dentry *src_dent,
+			      struct dentry *dst_dent_parent,
+			      struct dentry *trap_dent,
+			      char *dst_name)
+{
+	struct dentry *dst_dent;
+	int err;
+
+	spin_lock(&src_dent->d_lock);
+	list_for_each_entry(dst_dent, &src_dent->d_subdirs, d_child) {
+		struct ksmbd_file *child_fp;
+
+		if (d_really_is_negative(dst_dent))
+			continue;
+
+		child_fp = ksmbd_lookup_fd_inode(d_inode(dst_dent));
+		if (child_fp) {
+			spin_unlock(&src_dent->d_lock);
+			ksmbd_debug(VFS, "Forbid rename, sub file/dir is in use\n");
+			return -EACCES;
+		}
+	}
+	spin_unlock(&src_dent->d_lock);
+
+	if (d_really_is_negative(src_dent_parent))
+		return -ENOENT;
+	if (d_really_is_negative(dst_dent_parent))
+		return -ENOENT;
+	if (d_really_is_negative(src_dent))
+		return -ENOENT;
+	if (src_dent == trap_dent)
+		return -EINVAL;
+
+	if (ksmbd_override_fsids(work))
+		return -ENOMEM;
+
+	dst_dent = lookup_one_len(dst_name, dst_dent_parent, strlen(dst_name));
+	err = PTR_ERR(dst_dent);
+	if (IS_ERR(dst_dent)) {
+		ksmbd_err("lookup failed %s [%d]\n", dst_name, err);
+		goto out;
+	}
+
+	err = -ENOTEMPTY;
+	if (dst_dent != trap_dent && !d_really_is_positive(dst_dent)) {
+		struct renamedata rd = {
+			.old_mnt_userns	= &init_user_ns,
+			.old_dir	= d_inode(src_dent_parent),
+			.old_dentry	= src_dent,
+			.new_mnt_userns	= &init_user_ns,
+			.new_dir	= d_inode(dst_dent_parent),
+			.new_dentry	= dst_dent,
+		};
+		err = vfs_rename(&rd);
+	}
+	if (err)
+		ksmbd_err("vfs_rename failed err %d\n", err);
+	if (dst_dent)
+		dput(dst_dent);
+out:
+	ksmbd_revert_fsids(work);
+	return err;
+}
+
+int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file *fp,
+		char *newname)
+{
+	struct path dst_path;
+	struct dentry *src_dent_parent, *dst_dent_parent;
+	struct dentry *src_dent, *trap_dent;
+	char *dst_name;
+	int err;
+
+	dst_name = extract_last_component(newname);
+	if (!dst_name)
+		return -EINVAL;
+
+	src_dent_parent = dget_parent(fp->filp->f_path.dentry);
+	if (!src_dent_parent)
+		return -EINVAL;
+
+	src_dent = fp->filp->f_path.dentry;
+	dget(src_dent);
+
+	err = kern_path(newname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &dst_path);
+	if (err) {
+		ksmbd_debug(VFS, "Cannot get path for %s [%d]\n", newname, err);
+		goto out;
+	}
+	dst_dent_parent = dst_path.dentry;
+	dget(dst_dent_parent);
+
+	trap_dent = lock_rename(src_dent_parent, dst_dent_parent);
+	err = __ksmbd_vfs_rename(work,
+				 src_dent_parent,
+				 src_dent,
+				 dst_dent_parent,
+				 trap_dent,
+				 dst_name);
+	unlock_rename(src_dent_parent, dst_dent_parent);
+	dput(dst_dent_parent);
+	path_put(&dst_path);
+out:
+	dput(src_dent);
+	dput(src_dent_parent);
+	return err;
+}
+
+/**
+ * ksmbd_vfs_truncate() - vfs helper for smb file truncate
+ * @work:	work
+ * @name:	old filename
+ * @fid:	file id of old file
+ * @size:	truncate to given size
+ *
+ * Return:	0 on success, otherwise error
+ */
+int ksmbd_vfs_truncate(struct ksmbd_work *work, const char *name,
+	struct ksmbd_file *fp, loff_t size)
+{
+	struct path path;
+	int err = 0;
+	struct inode *inode;
+
+	if (name) {
+		err = kern_path(name, 0, &path);
+		if (err) {
+			ksmbd_err("cannot get linux path for %s, err %d\n",
+					name, err);
+			return err;
+		}
+		err = vfs_truncate(&path, size);
+		if (err)
+			ksmbd_err("truncate failed for %s err %d\n",
+					name, err);
+		path_put(&path);
+	} else {
+		struct file *filp;
+
+		filp = fp->filp;
+
+		/* Do we need to break any of a levelII oplock? */
+		smb_break_all_levII_oplock(work, fp, 1);
+
+		inode = file_inode(filp);
+		if (size < inode->i_size) {
+			err = check_lock_range(filp, size,
+					inode->i_size - 1, WRITE);
+		} else {
+			err = check_lock_range(filp, inode->i_size,
+					size - 1, WRITE);
+		}
+
+		if (err) {
+			ksmbd_err("failed due to lock\n");
+			return -EAGAIN;
+		}
+
+		err = vfs_truncate(&filp->f_path, size);
+		if (err)
+			ksmbd_err("truncate failed for filename : %s err %d\n",
+					fp->filename, err);
+	}
+
+	return err;
+}
+
+/**
+ * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
+ * @dentry:	dentry of file for listing xattrs
+ * @list:	destination buffer
+ * @size:	destination buffer length
+ *
+ * Return:	xattr list length on success, otherwise error
+ */
+ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
+{
+	ssize_t size;
+	char *vlist = NULL;
+
+	size = vfs_listxattr(dentry, NULL, 0);
+	if (size <= 0)
+		return size;
+
+	vlist = ksmbd_alloc(size);
+	if (!vlist)
+		return -ENOMEM;
+
+	*list = vlist;
+	size = vfs_listxattr(dentry, vlist, size);
+	if (size < 0) {
+		ksmbd_debug(VFS, "listxattr failed\n");
+		ksmbd_vfs_xattr_free(vlist);
+		*list = NULL;
+	}
+
+	return size;
+}
+
+static ssize_t ksmbd_vfs_xattr_len(struct dentry *dentry,
+			   char *xattr_name)
+{
+	return vfs_getxattr(&init_user_ns, dentry, xattr_name, NULL, 0);
+}
+
+/**
+ * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
+ * @dentry:	dentry of file for getting xattrs
+ * @xattr_name:	name of xattr name to query
+ * @xattr_buf:	destination buffer xattr value
+ *
+ * Return:	read xattr value length on success, otherwise error
+ */
+ssize_t ksmbd_vfs_getxattr(struct dentry *dentry,
+			   char *xattr_name,
+			   char **xattr_buf)
+{
+	ssize_t xattr_len;
+	char *buf;
+
+	*xattr_buf = NULL;
+	xattr_len = ksmbd_vfs_xattr_len(dentry, xattr_name);
+	if (xattr_len < 0)
+		return xattr_len;
+
+	buf = kmalloc(xattr_len + 1, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	xattr_len = vfs_getxattr(&init_user_ns, dentry, xattr_name, (void *)buf,
+			xattr_len);
+	if (xattr_len > 0)
+		*xattr_buf = buf;
+	else
+		kfree(buf);
+	return xattr_len;
+}
+
+/**
+ * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
+ * @dentry:	dentry to set XATTR at
+ * @name:	xattr name for setxattr
+ * @value:	xattr value to set
+ * @size:	size of xattr value
+ * @flags:	destination buffer length
+ *
+ * Return:	0 on success, otherwise error
+ */
+int ksmbd_vfs_setxattr(struct dentry *dentry,
+		       const char *attr_name,
+		       const void *attr_value,
+		       size_t attr_size,
+		       int flags)
+{
+	int err;
+
+	err = vfs_setxattr(&init_user_ns, dentry,
+			   attr_name,
+			   attr_value,
+			   attr_size,
+			   flags);
+	if (err)
+		ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
+	return err;
+}
+
+/**
+ * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
+ * @filp:	file pointer for IO
+ * @options:	smb IO options
+ */
+void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
+{
+	struct address_space *mapping;
+
+	mapping = filp->f_mapping;
+
+	if (!option || !mapping)
+		return;
+
+	if (option & FILE_WRITE_THROUGH_LE)
+		filp->f_flags |= O_SYNC;
+	else if (option & FILE_SEQUENTIAL_ONLY_LE) {
+		filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
+		spin_lock(&filp->f_lock);
+		filp->f_mode &= ~FMODE_RANDOM;
+		spin_unlock(&filp->f_lock);
+	} else if (option & FILE_RANDOM_ACCESS_LE) {
+		spin_lock(&filp->f_lock);
+		filp->f_mode |= FMODE_RANDOM;
+		spin_unlock(&filp->f_lock);
+	}
+}
+
+/**
+ * ksmbd_vfs_lock() - vfs helper for smb file locking
+ * @filp:	the file to apply the lock to
+ * @cmd:	type of locking operation (F_SETLK, F_GETLK, etc.)
+ * @flock:	The lock to be applied
+ *
+ * Return:	0 on success, otherwise error
+ */
+int ksmbd_vfs_lock(struct file *filp, int cmd,
+			struct file_lock *flock)
+{
+	ksmbd_debug(VFS, "calling vfs_lock_file\n");
+	return vfs_lock_file(filp, cmd, flock, NULL);
+}
+
+int ksmbd_vfs_readdir(struct file *file, struct ksmbd_readdir_data *rdata)
+{
+	return iterate_dir(file, &rdata->ctx);
+}
+
+int ksmbd_vfs_alloc_size(struct ksmbd_work *work,
+			 struct ksmbd_file *fp,
+			 loff_t len)
+{
+	smb_break_all_levII_oplock(work, fp, 1);
+	return vfs_fallocate(fp->filp, FALLOC_FL_KEEP_SIZE, 0, len);
+}
+
+int ksmbd_vfs_zero_data(struct ksmbd_work *work,
+			 struct ksmbd_file *fp,
+			 loff_t off,
+			 loff_t len)
+{
+	smb_break_all_levII_oplock(work, fp, 1);
+	if (fp->f_ci->m_fattr & ATTR_SPARSE_FILE_LE)
+		return vfs_fallocate(fp->filp,
+			FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, off, len);
+
+	return vfs_fallocate(fp->filp, FALLOC_FL_ZERO_RANGE, off, len);
+}
+
+int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
+	struct file_allocated_range_buffer *ranges,
+	int in_count, int *out_count)
+{
+	struct file *f = fp->filp;
+	struct inode *inode = FP_INODE(fp);
+	loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
+	loff_t extent_start, extent_end;
+	int ret = 0;
+
+	if (start > maxbytes)
+		return -EFBIG;
+
+	if (!in_count)
+		return 0;
+
+	/*
+	 * Shrink request scope to what the fs can actually handle.
+	 */
+	if (length > maxbytes || (maxbytes - length) < start)
+		length = maxbytes - start;
+
+	if (start + length > inode->i_size)
+		length = inode->i_size - start;
+
+	*out_count = 0;
+	end = start + length;
+	while (start < end && *out_count < in_count) {
+		extent_start = f->f_op->llseek(f, start, SEEK_DATA);
+		if (extent_start < 0) {
+			if (extent_start != -ENXIO)
+				ret = (int)extent_start;
+			break;
+		}
+
+		if (extent_start >= end)
+			break;
+
+		extent_end = f->f_op->llseek(f, extent_start, SEEK_HOLE);
+		if (extent_end < 0) {
+			if (extent_end != -ENXIO)
+				ret = (int)extent_end;
+			break;
+		} else if (extent_start >= extent_end)
+			break;
+
+		ranges[*out_count].file_offset = cpu_to_le64(extent_start);
+		ranges[(*out_count)++].length =
+			cpu_to_le64(min(extent_end, end) - extent_start);
+
+		start = extent_end;
+	}
+
+	return ret;
+}
+
+int ksmbd_vfs_remove_xattr(struct dentry *dentry, char *attr_name)
+{
+	return vfs_removexattr(&init_user_ns, dentry, attr_name);
+}
+
+void ksmbd_vfs_xattr_free(char *xattr)
+{
+	ksmbd_free(xattr);
+}
+
+int ksmbd_vfs_unlink(struct dentry *dir, struct dentry *dentry)
+{
+	int err = 0;
+
+	dget(dentry);
+	inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
+	if (!d_inode(dentry) || !d_inode(dentry)->i_nlink) {
+		err = -ENOENT;
+		goto out;
+	}
+
+	if (S_ISDIR(d_inode(dentry)->i_mode))
+		err = vfs_rmdir(&init_user_ns, d_inode(dir), dentry);
+	else
+		err = vfs_unlink(&init_user_ns, d_inode(dir), dentry, NULL);
+
+out:
+	inode_unlock(d_inode(dir));
+	dput(dentry);
+	if (err)
+		ksmbd_debug(VFS, "failed to delete, err %d\n", err);
+
+	return err;
+}
+
+/*
+ * ksmbd_vfs_get_logical_sector_size() - get logical sector size from inode
+ * @inode: inode
+ *
+ * Return: logical sector size
+ */
+unsigned short ksmbd_vfs_logical_sector_size(struct inode *inode)
+{
+	struct request_queue *q;
+	unsigned short ret_val = 512;
+
+	if (!inode->i_sb->s_bdev)
+		return ret_val;
+
+	q = inode->i_sb->s_bdev->bd_disk->queue;
+
+	if (q && q->limits.logical_block_size)
+		ret_val = q->limits.logical_block_size;
+
+	return ret_val;
+}
+
+/*
+ * ksmbd_vfs_get_smb2_sector_size() - get fs sector sizes
+ * @inode: inode
+ * @fs_ss: fs sector size struct
+ */
+void ksmbd_vfs_smb2_sector_size(struct inode *inode,
+	struct ksmbd_fs_sector_size *fs_ss)
+{
+	struct request_queue *q;
+
+	fs_ss->logical_sector_size = 512;
+	fs_ss->physical_sector_size = 512;
+	fs_ss->optimal_io_size = 512;
+
+	if (!inode->i_sb->s_bdev)
+		return;
+
+	q = inode->i_sb->s_bdev->bd_disk->queue;
+
+	if (q) {
+		if (q->limits.logical_block_size)
+			fs_ss->logical_sector_size =
+				q->limits.logical_block_size;
+		if (q->limits.physical_block_size)
+			fs_ss->physical_sector_size =
+				q->limits.physical_block_size;
+		if (q->limits.io_opt)
+			fs_ss->optimal_io_size = q->limits.io_opt;
+	}
+}
+
+static int __dir_empty(struct dir_context *ctx,
+				   const char *name,
+				   int namlen,
+				   loff_t offset,
+				   u64 ino,
+				   unsigned int d_type)
+{
+	struct ksmbd_readdir_data *buf;
+
+	buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
+	buf->dirent_count++;
+
+	if (buf->dirent_count > 2)
+		return -ENOTEMPTY;
+	return 0;
+}
+
+/**
+ * ksmbd_vfs_empty_dir() - check for empty directory
+ * @fp:	ksmbd file pointer
+ *
+ * Return:	true if directory empty, otherwise false
+ */
+int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
+{
+	int err;
+	struct ksmbd_readdir_data readdir_data;
+
+	memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
+
+	set_ctx_actor(&readdir_data.ctx, __dir_empty);
+	readdir_data.dirent_count = 0;
+
+	err = ksmbd_vfs_readdir(fp->filp, &readdir_data);
+	if (readdir_data.dirent_count > 2)
+		err = -ENOTEMPTY;
+	else
+		err = 0;
+	return err;
+}
+
+static int __caseless_lookup(struct dir_context *ctx,
+			     const char *name,
+			     int namlen,
+			     loff_t offset,
+			     u64 ino,
+			     unsigned int d_type)
+{
+	struct ksmbd_readdir_data *buf;
+
+	buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
+
+	if (buf->used != namlen)
+		return 0;
+	if (!strncasecmp((char *)buf->private, name, namlen)) {
+		memcpy((char *)buf->private, name, namlen);
+		buf->dirent_count = 1;
+		return -EEXIST;
+	}
+	return 0;
+}
+
+/**
+ * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
+ * @dirname:	directory name
+ * @filename:	filename to lookup
+ *
+ * Return:	0 on success, otherwise error
+ */
+static int ksmbd_vfs_lookup_in_dir(char *dirname, char *filename)
+{
+	struct path dir_path;
+	int ret;
+	struct file *dfilp;
+	int flags = O_RDONLY|O_LARGEFILE;
+	int dirnamelen = strlen(dirname);
+	struct ksmbd_readdir_data readdir_data = {
+		.ctx.actor	= __caseless_lookup,
+		.private	= filename,
+		.used		= strlen(filename),
+	};
+
+	ret = ksmbd_vfs_kern_path(dirname, 0, &dir_path, true);
+	if (ret)
+		goto error;
+
+	dfilp = dentry_open(&dir_path, flags, current_cred());
+	if (IS_ERR(dfilp)) {
+		path_put(&dir_path);
+		ksmbd_err("cannot open directory %s\n", dirname);
+		ret = -EINVAL;
+		goto error;
+	}
+
+	ret = ksmbd_vfs_readdir(dfilp, &readdir_data);
+	if (readdir_data.dirent_count > 0)
+		ret = 0;
+
+	fput(dfilp);
+	path_put(&dir_path);
+error:
+	dirname[dirnamelen] = '/';
+	return ret;
+}
+
+/**
+ * ksmbd_vfs_kern_path() - lookup a file and get path info
+ * @name:	name of file for lookup
+ * @flags:	lookup flags
+ * @path:	if lookup succeed, return path info
+ * @caseless:	caseless filename lookup
+ *
+ * Return:	0 on success, otherwise error
+ */
+int ksmbd_vfs_kern_path(char *name, unsigned int flags, struct path *path,
+		bool caseless)
+{
+	char *filename = NULL;
+	int err;
+
+	err = kern_path(name, flags, path);
+	if (!err)
+		return err;
+
+	if (caseless) {
+		filename = extract_last_component(name);
+		if (!filename)
+			goto out;
+
+		/* root reached */
+		if (strlen(name) == 0)
+			goto out;
+
+		err = ksmbd_vfs_lookup_in_dir(name, filename);
+		if (err)
+			goto out;
+		err = kern_path(name, flags, path);
+	}
+
+out:
+	rollback_path_modification(filename);
+	return err;
+}
+
+int ksmbd_vfs_remove_acl_xattrs(struct dentry *dentry)
+{
+	char *name, *xattr_list = NULL;
+	ssize_t xattr_list_len;
+	int err = 0;
+
+	xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
+	if (xattr_list_len < 0) {
+		goto out;
+	} else if (!xattr_list_len) {
+		ksmbd_debug(SMB, "empty xattr in the file\n");
+		goto out;
+	}
+
+	for (name = xattr_list; name - xattr_list < xattr_list_len;
+			name += strlen(name) + 1) {
+		ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
+
+		if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
+			     sizeof(XATTR_NAME_POSIX_ACL_ACCESS)-1) ||
+		    !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
+			     sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)-1)) {
+			err = ksmbd_vfs_remove_xattr(dentry, name);
+			if (err)
+				ksmbd_debug(SMB,
+					"remove acl xattr failed : %s\n", name);
+		}
+	}
+out:
+	ksmbd_vfs_xattr_free(xattr_list);
+	return err;
+}
+
+int ksmbd_vfs_remove_sd_xattrs(struct dentry *dentry)
+{
+	char *name, *xattr_list = NULL;
+	ssize_t xattr_list_len;
+	int err = 0;
+
+	xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
+	if (xattr_list_len < 0) {
+		goto out;
+	} else if (!xattr_list_len) {
+		ksmbd_debug(SMB, "empty xattr in the file\n");
+		goto out;
+	}
+
+	for (name = xattr_list; name - xattr_list < xattr_list_len;
+			name += strlen(name) + 1) {
+		ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
+
+		if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
+			err = ksmbd_vfs_remove_xattr(dentry, name);
+			if (err)
+				ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
+		}
+	}
+out:
+	ksmbd_vfs_xattr_free(xattr_list);
+	return err;
+}
+
+static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct inode *inode,
+		int acl_type)
+{
+	struct xattr_smb_acl *smb_acl = NULL;
+	struct posix_acl *posix_acls;
+	struct posix_acl_entry *pa_entry;
+	struct xattr_acl_entry *xa_entry;
+	int i;
+
+	posix_acls = ksmbd_vfs_get_acl(inode, acl_type);
+	if (!posix_acls)
+		return NULL;
+
+	smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
+			  sizeof(struct xattr_acl_entry) * posix_acls->a_count,
+			  GFP_KERNEL);
+	if (!smb_acl)
+		goto out;
+
+	smb_acl->count = posix_acls->a_count;
+	pa_entry = posix_acls->a_entries;
+	xa_entry = smb_acl->entries;
+	for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
+		switch (pa_entry->e_tag) {
+		case ACL_USER:
+			xa_entry->type = SMB_ACL_USER;
+			xa_entry->uid = from_kuid(&init_user_ns, pa_entry->e_uid);
+			break;
+		case ACL_USER_OBJ:
+			xa_entry->type = SMB_ACL_USER_OBJ;
+			break;
+		case ACL_GROUP:
+			xa_entry->type = SMB_ACL_GROUP;
+			xa_entry->gid = from_kgid(&init_user_ns, pa_entry->e_gid);
+			break;
+		case ACL_GROUP_OBJ:
+			xa_entry->type = SMB_ACL_GROUP_OBJ;
+			break;
+		case ACL_OTHER:
+			xa_entry->type = SMB_ACL_OTHER;
+			break;
+		case ACL_MASK:
+			xa_entry->type = SMB_ACL_MASK;
+			break;
+		default:
+			ksmbd_err("unknown type : 0x%x\n", pa_entry->e_tag);
+			goto out;
+		}
+
+		if (pa_entry->e_perm & ACL_READ)
+			xa_entry->perm |= SMB_ACL_READ;
+		if (pa_entry->e_perm & ACL_WRITE)
+			xa_entry->perm |= SMB_ACL_WRITE;
+		if (pa_entry->e_perm & ACL_EXECUTE)
+			xa_entry->perm |= SMB_ACL_EXECUTE;
+	}
+out:
+	posix_acl_release(posix_acls);
+	return smb_acl;
+}
+
+int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn, struct dentry *dentry,
+		struct smb_ntsd *pntsd, int len)
+{
+	int rc;
+	struct ndr sd_ndr = {0}, acl_ndr = {0};
+	struct xattr_ntacl acl = {0};
+	struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
+	struct inode *inode = dentry->d_inode;
+
+	acl.version = 4;
+	acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
+	acl.current_time = ksmbd_UnixTimeToNT(current_time(dentry->d_inode));
+
+	memcpy(acl.desc, "posix_acl", 9);
+	acl.desc_len = 10;
+
+	pntsd->osidoffset =
+		cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
+	pntsd->gsidoffset =
+		cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
+	pntsd->dacloffset =
+		cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
+
+	acl.sd_buf = (char *)pntsd;
+	acl.sd_size = len;
+
+	rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
+	if (rc) {
+		ksmbd_err("failed to generate hash for ndr acl\n");
+		return rc;
+	}
+
+	smb_acl = ksmbd_vfs_make_xattr_posix_acl(dentry->d_inode, ACL_TYPE_ACCESS);
+	if (S_ISDIR(inode->i_mode))
+		def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(dentry->d_inode,
+				ACL_TYPE_DEFAULT);
+
+	rc = ndr_encode_posix_acl(&acl_ndr, inode, smb_acl, def_smb_acl);
+	if (rc) {
+		ksmbd_err("failed to encode ndr to posix acl\n");
+		goto out;
+	}
+
+	rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
+			acl.posix_acl_hash);
+	if (rc) {
+		ksmbd_err("failed to generate hash for ndr acl\n");
+		goto out;
+	}
+
+	rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
+	if (rc) {
+		ksmbd_err("failed to encode ndr to posix acl\n");
+		goto out;
+	}
+
+	rc = ksmbd_vfs_setxattr(dentry, XATTR_NAME_SD, sd_ndr.data,
+			sd_ndr.offset, 0);
+	if (rc < 0)
+		ksmbd_err("Failed to store XATTR ntacl :%d\n", rc);
+
+	kfree(sd_ndr.data);
+out:
+	kfree(acl_ndr.data);
+	kfree(smb_acl);
+	kfree(def_smb_acl);
+	return rc;
+}
+
+int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn, struct dentry *dentry,
+		struct smb_ntsd **pntsd)
+{
+	int rc;
+	struct ndr n;
+
+	rc = ksmbd_vfs_getxattr(dentry, XATTR_NAME_SD, &n.data);
+	if (rc > 0) {
+		struct inode *inode = dentry->d_inode;
+		struct ndr acl_ndr = {0};
+		struct xattr_ntacl acl;
+		struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
+		__u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
+
+		n.length = rc;
+		rc = ndr_decode_v4_ntacl(&n, &acl);
+		if (rc)
+			return rc;
+
+		smb_acl = ksmbd_vfs_make_xattr_posix_acl(inode,
+				ACL_TYPE_ACCESS);
+		if (S_ISDIR(inode->i_mode))
+			def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(inode,
+					ACL_TYPE_DEFAULT);
+
+		rc = ndr_encode_posix_acl(&acl_ndr, inode, smb_acl, def_smb_acl);
+		if (rc) {
+			ksmbd_err("failed to encode ndr to posix acl\n");
+			goto out;
+		}
+
+		rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
+				cmp_hash);
+		if (rc) {
+			ksmbd_err("failed to generate hash for ndr acl\n");
+			goto out;
+		}
+
+		if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
+			ksmbd_err("hash value diff\n");
+			rc = -EINVAL;
+			goto out;
+		}
+
+		*pntsd = acl.sd_buf;
+		(*pntsd)->osidoffset =
+			cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) - NDR_NTSD_OFFSETOF);
+		(*pntsd)->gsidoffset =
+			cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) - NDR_NTSD_OFFSETOF);
+		(*pntsd)->dacloffset =
+			cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) - NDR_NTSD_OFFSETOF);
+
+		rc = acl.sd_size;
+out:
+		kfree(n.data);
+		kfree(acl_ndr.data);
+		kfree(smb_acl);
+		kfree(def_smb_acl);
+	}
+
+	return rc;
+}
+
+int ksmbd_vfs_set_dos_attrib_xattr(struct dentry *dentry,
+		struct xattr_dos_attrib *da)
+{
+	struct ndr n;
+	int err;
+
+	err = ndr_encode_dos_attr(&n, da);
+	if (err)
+		return err;
+
+	err = ksmbd_vfs_setxattr(dentry,
+			XATTR_NAME_DOS_ATTRIBUTE,
+			(void *)n.data,
+			n.offset,
+			0);
+	if (err)
+		ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
+	kfree(n.data);
+
+	return err;
+}
+
+int ksmbd_vfs_get_dos_attrib_xattr(struct dentry *dentry,
+		struct xattr_dos_attrib *da)
+{
+	struct ndr n;
+	int err;
+
+	err = ksmbd_vfs_getxattr(dentry,
+			XATTR_NAME_DOS_ATTRIBUTE,
+			(char **)&n.data);
+	if (err > 0) {
+		n.length = err;
+		if (ndr_decode_dos_attr(&n, da))
+			err = -EINVAL;
+		ksmbd_free(n.data);
+	} else
+		ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
+
+	return err;
+}
+
+struct posix_acl *ksmbd_vfs_posix_acl_alloc(int count, gfp_t flags)
+{
+#if IS_ENABLED(CONFIG_FS_POSIX_ACL)
+	return posix_acl_alloc(count, flags);
+#else
+	return NULL;
+#endif
+}
+
+struct posix_acl *ksmbd_vfs_get_acl(struct inode *inode, int type)
+{
+#if IS_ENABLED(CONFIG_FS_POSIX_ACL)
+	return get_acl(inode, type);
+#else
+	return NULL;
+#endif
+}
+
+int ksmbd_vfs_set_posix_acl(struct inode *inode, int type,
+		struct posix_acl *acl)
+{
+#if IS_ENABLED(CONFIG_FS_POSIX_ACL)
+	return set_posix_acl(&init_user_ns, inode, type, acl);
+#else
+	return -EOPNOTSUPP;
+#endif
+}
+
+/**
+ * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
+ * @p:          destination buffer
+ * @ksmbd_kstat:      ksmbd kstat wrapper
+ */
+void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
+{
+	struct file_directory_info *info = (struct file_directory_info *)(*p);
+	struct kstat *kstat = ksmbd_kstat->kstat;
+	u64 time;
+
+	info->FileIndex = 0;
+	info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
+	time = ksmbd_UnixTimeToNT(kstat->atime);
+	info->LastAccessTime = cpu_to_le64(time);
+	time = ksmbd_UnixTimeToNT(kstat->mtime);
+	info->LastWriteTime = cpu_to_le64(time);
+	time = ksmbd_UnixTimeToNT(kstat->ctime);
+	info->ChangeTime = cpu_to_le64(time);
+
+	if (ksmbd_kstat->file_attributes & ATTR_DIRECTORY_LE) {
+		info->EndOfFile = 0;
+		info->AllocationSize = 0;
+	} else {
+		info->EndOfFile = cpu_to_le64(kstat->size);
+		info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
+	}
+	info->ExtFileAttributes = ksmbd_kstat->file_attributes;
+
+	return info;
+}
+
+int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
+				struct dentry *dentry,
+				struct ksmbd_kstat *ksmbd_kstat)
+{
+	u64 time;
+	int rc;
+
+	generic_fillattr(&init_user_ns, d_inode(dentry), ksmbd_kstat->kstat);
+
+	time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
+	ksmbd_kstat->create_time = time;
+
+	/*
+	 * set default value for the case that store dos attributes is not yes
+	 * or that acl is disable in server's filesystem and the config is yes.
+	 */
+	if (S_ISDIR(ksmbd_kstat->kstat->mode))
+		ksmbd_kstat->file_attributes = ATTR_DIRECTORY_LE;
+	else
+		ksmbd_kstat->file_attributes = ATTR_ARCHIVE_LE;
+
+	if (test_share_config_flag(work->tcon->share_conf,
+	    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
+		struct xattr_dos_attrib da;
+
+		rc = ksmbd_vfs_get_dos_attrib_xattr(dentry, &da);
+		if (rc > 0) {
+			ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
+			ksmbd_kstat->create_time = da.create_time;
+		} else
+			ksmbd_debug(VFS, "fail to load dos attribute.\n");
+	}
+
+	return 0;
+}
+
+ssize_t ksmbd_vfs_casexattr_len(struct dentry *dentry,
+				char *attr_name,
+				int attr_name_len)
+{
+	char *name, *xattr_list = NULL;
+	ssize_t value_len = -ENOENT, xattr_list_len;
+
+	xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
+	if (xattr_list_len <= 0)
+		goto out;
+
+	for (name = xattr_list; name - xattr_list < xattr_list_len;
+			name += strlen(name) + 1) {
+		ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
+		if (strncasecmp(attr_name, name, attr_name_len))
+			continue;
+
+		value_len = ksmbd_vfs_xattr_len(dentry, name);
+		break;
+	}
+
+out:
+	ksmbd_vfs_xattr_free(xattr_list);
+	return value_len;
+}
+
+int ksmbd_vfs_xattr_stream_name(char *stream_name,
+				char **xattr_stream_name,
+				size_t *xattr_stream_name_size,
+				int s_type)
+{
+	int stream_name_size;
+	char *xattr_stream_name_buf;
+	char *type;
+	int type_len;
+
+	if (s_type == DIR_STREAM)
+		type = ":$INDEX_ALLOCATION";
+	else
+		type = ":$DATA";
+
+	type_len = strlen(type);
+	stream_name_size = strlen(stream_name);
+	*xattr_stream_name_size = stream_name_size + XATTR_NAME_STREAM_LEN + 1;
+	xattr_stream_name_buf = kmalloc(*xattr_stream_name_size + type_len,
+			GFP_KERNEL);
+	if (!xattr_stream_name_buf)
+		return -ENOMEM;
+
+	memcpy(xattr_stream_name_buf,
+		XATTR_NAME_STREAM,
+		XATTR_NAME_STREAM_LEN);
+
+	if (stream_name_size) {
+		memcpy(&xattr_stream_name_buf[XATTR_NAME_STREAM_LEN],
+			stream_name,
+			stream_name_size);
+	}
+	memcpy(&xattr_stream_name_buf[*xattr_stream_name_size - 1], type, type_len);
+		*xattr_stream_name_size += type_len;
+
+	xattr_stream_name_buf[*xattr_stream_name_size - 1] = '\0';
+	*xattr_stream_name = xattr_stream_name_buf;
+
+	return 0;
+}
+
+static int ksmbd_vfs_copy_file_range(struct file *file_in, loff_t pos_in,
+				struct file *file_out, loff_t pos_out,
+				size_t len)
+{
+	struct inode *inode_in = file_inode(file_in);
+	struct inode *inode_out = file_inode(file_out);
+	int ret;
+
+	ret = vfs_copy_file_range(file_in, pos_in, file_out, pos_out, len, 0);
+	/* do splice for the copy between different file systems */
+	if (ret != -EXDEV)
+		return ret;
+
+	if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode))
+		return -EISDIR;
+	if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
+		return -EINVAL;
+
+	if (!(file_in->f_mode & FMODE_READ) ||
+	    !(file_out->f_mode & FMODE_WRITE))
+		return -EBADF;
+
+	if (len == 0)
+		return 0;
+
+	file_start_write(file_out);
+
+	/*
+	 * skip the verification of the range of data. it will be done
+	 * in do_splice_direct
+	 */
+	ret = do_splice_direct(file_in, &pos_in, file_out, &pos_out,
+			len > MAX_RW_COUNT ? MAX_RW_COUNT : len, 0);
+	if (ret > 0) {
+		fsnotify_access(file_in);
+		add_rchar(current, ret);
+		fsnotify_modify(file_out);
+		add_wchar(current, ret);
+	}
+
+	inc_syscr(current);
+	inc_syscw(current);
+
+	file_end_write(file_out);
+	return ret;
+}
+
+int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
+				struct ksmbd_file *src_fp,
+				struct ksmbd_file *dst_fp,
+				struct srv_copychunk *chunks,
+				unsigned int chunk_count,
+				unsigned int *chunk_count_written,
+				unsigned int *chunk_size_written,
+				loff_t *total_size_written)
+{
+	unsigned int i;
+	loff_t src_off, dst_off, src_file_size;
+	size_t len;
+	int ret;
+
+	*chunk_count_written = 0;
+	*chunk_size_written = 0;
+	*total_size_written = 0;
+
+	if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
+		ksmbd_err("no right to read(%s)\n", FP_FILENAME(src_fp));
+		return -EACCES;
+	}
+	if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
+		ksmbd_err("no right to write(%s)\n", FP_FILENAME(dst_fp));
+		return -EACCES;
+	}
+
+	if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
+		return -EBADF;
+
+	smb_break_all_levII_oplock(work, dst_fp, 1);
+
+	for (i = 0; i < chunk_count; i++) {
+		src_off = le64_to_cpu(chunks[i].SourceOffset);
+		dst_off = le64_to_cpu(chunks[i].TargetOffset);
+		len = le32_to_cpu(chunks[i].Length);
+
+		if (check_lock_range(src_fp->filp, src_off,
+				src_off + len - 1, READ))
+			return -EAGAIN;
+		if (check_lock_range(dst_fp->filp, dst_off,
+				dst_off + len - 1, WRITE))
+			return -EAGAIN;
+	}
+
+	src_file_size = i_size_read(file_inode(src_fp->filp));
+
+	for (i = 0; i < chunk_count; i++) {
+		src_off = le64_to_cpu(chunks[i].SourceOffset);
+		dst_off = le64_to_cpu(chunks[i].TargetOffset);
+		len = le32_to_cpu(chunks[i].Length);
+
+		if (src_off + len > src_file_size)
+			return -E2BIG;
+
+		ret = ksmbd_vfs_copy_file_range(src_fp->filp, src_off,
+				dst_fp->filp, dst_off, len);
+		if (ret < 0)
+			return ret;
+
+		*chunk_count_written += 1;
+		*total_size_written += ret;
+	}
+	return 0;
+}
+
+int ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
+{
+	return wait_event_interruptible(flock->fl_wait, !flock->fl_blocker);
+}
+
+int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
+{
+	return wait_event_interruptible_timeout(flock->fl_wait,
+						!flock->fl_blocker,
+						timeout);
+}
+
+void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
+{
+	locks_delete_block(flock);
+}
+
+int ksmbd_vfs_set_init_posix_acl(struct inode *inode)
+{
+	struct posix_acl_state acl_state;
+	struct posix_acl *acls;
+	int rc;
+
+	ksmbd_debug(SMB, "Set posix acls\n");
+	rc = init_acl_state(&acl_state, 1);
+	if (rc)
+		return rc;
+
+	/* Set default owner group */
+	acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
+	acl_state.group.allow = (inode->i_mode & 0070) >> 3;
+	acl_state.other.allow = inode->i_mode & 0007;
+	acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
+	acl_state.users->aces[acl_state.users->n++].perms.allow =
+		acl_state.owner.allow;
+	acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
+	acl_state.groups->aces[acl_state.groups->n++].perms.allow =
+		acl_state.group.allow;
+	acl_state.mask.allow = 0x07;
+
+	acls = ksmbd_vfs_posix_acl_alloc(6, GFP_KERNEL);
+	if (!acls) {
+		free_acl_state(&acl_state);
+		return -ENOMEM;
+	}
+	posix_state_to_acl(&acl_state, acls->a_entries);
+	rc = ksmbd_vfs_set_posix_acl(inode, ACL_TYPE_ACCESS, acls);
+	if (rc < 0)
+		ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
+				rc);
+	else if (S_ISDIR(inode->i_mode)) {
+		posix_state_to_acl(&acl_state, acls->a_entries);
+		rc = ksmbd_vfs_set_posix_acl(inode, ACL_TYPE_DEFAULT, acls);
+		if (rc < 0)
+			ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
+					rc);
+	}
+	free_acl_state(&acl_state);
+	posix_acl_release(acls);
+	return rc;
+}
+
+int ksmbd_vfs_inherit_posix_acl(struct inode *inode, struct inode *parent_inode)
+{
+	struct posix_acl *acls;
+	struct posix_acl_entry *pace;
+	int rc, i;
+
+	acls = ksmbd_vfs_get_acl(parent_inode, ACL_TYPE_DEFAULT);
+	if (!acls)
+		return -ENOENT;
+	pace = acls->a_entries;
+
+	for (i = 0; i < acls->a_count; i++, pace++) {
+		if (pace->e_tag == ACL_MASK) {
+			pace->e_perm = 0x07;
+			break;
+		}
+	}
+
+	rc = ksmbd_vfs_set_posix_acl(inode, ACL_TYPE_ACCESS, acls);
+	if (rc < 0)
+		ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
+				rc);
+	if (S_ISDIR(inode->i_mode)) {
+		rc = ksmbd_vfs_set_posix_acl(inode, ACL_TYPE_DEFAULT, acls);
+		if (rc < 0)
+			ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
+					rc);
+	}
+	posix_acl_release(acls);
+	return rc;
+}