RE: [PATCH 3/5] cifsd: add file operations

[Schaufler, Casey]

> -----Original Message-----
> From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
> Sent: Sunday, March 21, 2021 10:14 PM
> To: linux-fsdevel@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-
> cifs@xxxxxxxxxxxxxxx
> Cc: linux-cifsd-devel@xxxxxxxxxxxxxxxxxxxxx; smfrench@xxxxxxxxx;
> senozhatsky@xxxxxxxxxxxx; hyc.lee@xxxxxxxxx; viro@xxxxxxxxxxxxxxxxxx;
> hch@xxxxxx; hch@xxxxxxxxxxxxx; ronniesahlberg@xxxxxxxxx;
> aurelien.aptel@xxxxxxxxx; aaptel@xxxxxxxx; sandeen@xxxxxxxxxxx;
> dan.carpenter@xxxxxxxxxx; colin.king@xxxxxxxxxxxxx;
> rdunlap@xxxxxxxxxxxxx; Namjae Jeon <namjae.jeon@xxxxxxxxxxx>;
> Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>; Steve French
> <stfrench@xxxxxxxxxxxxx>
> Subject: [PATCH 3/5] cifsd: add file operations
> 
> This adds file operations and buffer pool for cifsd.
> 
> Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
> Signed-off-by: Hyunchul Lee <hyc.lee@xxxxxxxxx>
> Acked-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
> Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
> ---
>  fs/cifsd/buffer_pool.c |  292 ++++++
>  fs/cifsd/buffer_pool.h |   28 +
>  fs/cifsd/vfs.c         | 1989 ++++++++++++++++++++++++++++++++++++++++
>  fs/cifsd/vfs.h         |  314 +++++++
>  fs/cifsd/vfs_cache.c   |  851 +++++++++++++++++
>  fs/cifsd/vfs_cache.h   |  213 +++++
>  6 files changed, 3687 insertions(+)
>  create mode 100644 fs/cifsd/buffer_pool.c
>  create mode 100644 fs/cifsd/buffer_pool.h
>  create mode 100644 fs/cifsd/vfs.c
>  create mode 100644 fs/cifsd/vfs.h
>  create mode 100644 fs/cifsd/vfs_cache.c
>  create mode 100644 fs/cifsd/vfs_cache.h
> 
> diff --git a/fs/cifsd/buffer_pool.c b/fs/cifsd/buffer_pool.c
> new file mode 100644
> index 000000000000..864fea547c68
> --- /dev/null
> +++ b/fs/cifsd/buffer_pool.c
> @@ -0,0 +1,292 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/wait.h>
> +#include <linux/sched.h>
> +#include <linux/mm.h>
> +#include <linux/slab.h>
> +#include <linux/vmalloc.h>
> +#include <linux/rwlock.h>
> +
> +#include "glob.h"
> +#include "buffer_pool.h"
> +#include "connection.h"
> +#include "mgmt/ksmbd_ida.h"
> +
> +static struct kmem_cache *filp_cache;
> +
> +struct wm {
> +	struct list_head	list;
> +	unsigned int		sz;
> +	char			buffer[0];
> +};
> +
> +struct wm_list {
> +	struct list_head	list;
> +	unsigned int		sz;
> +
> +	spinlock_t		wm_lock;
> +	int			avail_wm;
> +	struct list_head	idle_wm;
> +	wait_queue_head_t	wm_wait;
> +};
> +
> +static LIST_HEAD(wm_lists);
> +static DEFINE_RWLOCK(wm_lists_lock);
> +
> +void *ksmbd_alloc(size_t size)
> +{
> +	return kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
> +}
> +
> +void ksmbd_free(void *ptr)
> +{
> +	kvfree(ptr);
> +}
> +
> +static struct wm *wm_alloc(size_t sz, gfp_t flags)
> +{
> +	struct wm *wm;
> +	size_t alloc_sz = sz + sizeof(struct wm);
> +
> +	wm = kvmalloc(alloc_sz, flags);
> +	if (!wm)
> +		return NULL;
> +	wm->sz = sz;
> +	return wm;
> +}
> +
> +static int register_wm_size_class(size_t sz)
> +{
> +	struct wm_list *l, *nl;
> +
> +	nl = kvmalloc(sizeof(struct wm_list), GFP_KERNEL);
> +	if (!nl)
> +		return -ENOMEM;
> +
> +	nl->sz = sz;
> +	spin_lock_init(&nl->wm_lock);
> +	INIT_LIST_HEAD(&nl->idle_wm);
> +	INIT_LIST_HEAD(&nl->list);
> +	init_waitqueue_head(&nl->wm_wait);
> +	nl->avail_wm = 0;
> +
> +	write_lock(&wm_lists_lock);
> +	list_for_each_entry(l, &wm_lists, list) {
> +		if (l->sz == sz) {
> +			write_unlock(&wm_lists_lock);
> +			kvfree(nl);
> +			return 0;
> +		}
> +	}
> +
> +	list_add(&nl->list, &wm_lists);
> +	write_unlock(&wm_lists_lock);
> +	return 0;
> +}
> +
> +static struct wm_list *match_wm_list(size_t size)
> +{
> +	struct wm_list *l, *rl = NULL;
> +
> +	read_lock(&wm_lists_lock);
> +	list_for_each_entry(l, &wm_lists, list) {
> +		if (l->sz == size) {
> +			rl = l;
> +			break;
> +		}
> +	}
> +	read_unlock(&wm_lists_lock);
> +	return rl;
> +}
> +
> +static struct wm *find_wm(size_t size)
> +{
> +	struct wm_list *wm_list;
> +	struct wm *wm;
> +
> +	wm_list = match_wm_list(size);
> +	if (!wm_list) {
> +		if (register_wm_size_class(size))
> +			return NULL;
> +		wm_list = match_wm_list(size);
> +	}
> +
> +	if (!wm_list)
> +		return NULL;
> +
> +	while (1) {
> +		spin_lock(&wm_list->wm_lock);
> +		if (!list_empty(&wm_list->idle_wm)) {
> +			wm = list_entry(wm_list->idle_wm.next,
> +					struct wm,
> +					list);
> +			list_del(&wm->list);
> +			spin_unlock(&wm_list->wm_lock);
> +			return wm;
> +		}
> +
> +		if (wm_list->avail_wm > num_online_cpus()) {
> +			spin_unlock(&wm_list->wm_lock);
> +			wait_event(wm_list->wm_wait,
> +				   !list_empty(&wm_list->idle_wm));
> +			continue;
> +		}
> +
> +		wm_list->avail_wm++;
> +		spin_unlock(&wm_list->wm_lock);
> +
> +		wm = wm_alloc(size, GFP_KERNEL);
> +		if (!wm) {
> +			spin_lock(&wm_list->wm_lock);
> +			wm_list->avail_wm--;
> +			spin_unlock(&wm_list->wm_lock);
> +			wait_event(wm_list->wm_wait,
> +				   !list_empty(&wm_list->idle_wm));
> +			continue;
> +		}
> +		break;
> +	}
> +
> +	return wm;
> +}
> +
> +static void release_wm(struct wm *wm, struct wm_list *wm_list)
> +{
> +	if (!wm)
> +		return;
> +
> +	spin_lock(&wm_list->wm_lock);
> +	if (wm_list->avail_wm <= num_online_cpus()) {
> +		list_add(&wm->list, &wm_list->idle_wm);
> +		spin_unlock(&wm_list->wm_lock);
> +		wake_up(&wm_list->wm_wait);
> +		return;
> +	}
> +
> +	wm_list->avail_wm--;
> +	spin_unlock(&wm_list->wm_lock);
> +	ksmbd_free(wm);
> +}
> +
> +static void wm_list_free(struct wm_list *l)
> +{
> +	struct wm *wm;
> +
> +	while (!list_empty(&l->idle_wm)) {
> +		wm = list_entry(l->idle_wm.next, struct wm, list);
> +		list_del(&wm->list);
> +		kvfree(wm);
> +	}
> +	kvfree(l);
> +}
> +
> +static void wm_lists_destroy(void)
> +{
> +	struct wm_list *l;
> +
> +	while (!list_empty(&wm_lists)) {
> +		l = list_entry(wm_lists.next, struct wm_list, list);
> +		list_del(&l->list);
> +		wm_list_free(l);
> +	}
> +}
> +
> +void ksmbd_free_request(void *addr)
> +{
> +	kvfree(addr);
> +}
> +
> +void *ksmbd_alloc_request(size_t size)
> +{
> +	return kvmalloc(size, GFP_KERNEL);
> +}
> +
> +void ksmbd_free_response(void *buffer)
> +{
> +	kvfree(buffer);
> +}
> +
> +void *ksmbd_alloc_response(size_t size)
> +{
> +	return kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
> +}
> +
> +void *ksmbd_find_buffer(size_t size)
> +{
> +	struct wm *wm;
> +
> +	wm = find_wm(size);
> +
> +	WARN_ON(!wm);
> +	if (wm)
> +		return wm->buffer;
> +	return NULL;
> +}
> +
> +void ksmbd_release_buffer(void *buffer)
> +{
> +	struct wm_list *wm_list;
> +	struct wm *wm;
> +
> +	if (!buffer)
> +		return;
> +
> +	wm = container_of(buffer, struct wm, buffer);
> +	wm_list = match_wm_list(wm->sz);
> +	WARN_ON(!wm_list);
> +	if (wm_list)
> +		release_wm(wm, wm_list);
> +}
> +
> +void *ksmbd_realloc_response(void *ptr, size_t old_sz, size_t new_sz)
> +{
> +	size_t sz = min(old_sz, new_sz);
> +	void *nptr;
> +
> +	nptr = ksmbd_alloc_response(new_sz);
> +	if (!nptr)
> +		return ptr;
> +	memcpy(nptr, ptr, sz);
> +	ksmbd_free_response(ptr);
> +	return nptr;
> +}
> +
> +void ksmbd_free_file_struct(void *filp)
> +{
> +	kmem_cache_free(filp_cache, filp);
> +}
> +
> +void *ksmbd_alloc_file_struct(void)
> +{
> +	return kmem_cache_zalloc(filp_cache, GFP_KERNEL);
> +}
> +
> +void ksmbd_destroy_buffer_pools(void)
> +{
> +	wm_lists_destroy();
> +	ksmbd_work_pool_destroy();
> +	kmem_cache_destroy(filp_cache);
> +}
> +
> +int ksmbd_init_buffer_pools(void)
> +{
> +	if (ksmbd_work_pool_init())
> +		goto out;
> +
> +	filp_cache = kmem_cache_create("ksmbd_file_cache",
> +					sizeof(struct ksmbd_file), 0,
> +					SLAB_HWCACHE_ALIGN, NULL);
> +	if (!filp_cache)
> +		goto out;
> +
> +	return 0;
> +
> +out:
> +	ksmbd_err("failed to allocate memory\n");
> +	ksmbd_destroy_buffer_pools();
> +	return -ENOMEM;
> +}
> diff --git a/fs/cifsd/buffer_pool.h b/fs/cifsd/buffer_pool.h
> new file mode 100644
> index 000000000000..2b3d03afcf27
> --- /dev/null
> +++ b/fs/cifsd/buffer_pool.h
> @@ -0,0 +1,28 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
> + */
> +
> +#ifndef __KSMBD_BUFFER_POOL_H__
> +#define __KSMBD_BUFFER_POOL_H__
> +
> +void *ksmbd_find_buffer(size_t size);
> +void ksmbd_release_buffer(void *buffer);
> +
> +void *ksmbd_alloc(size_t size);
> +void ksmbd_free(void *ptr);
> +
> +void ksmbd_free_request(void *addr);
> +void *ksmbd_alloc_request(size_t size);
> +void ksmbd_free_response(void *buffer);
> +void *ksmbd_alloc_response(size_t size);
> +
> +void *ksmbd_realloc_response(void *ptr, size_t old_sz, size_t new_sz);
> +
> +void ksmbd_free_file_struct(void *filp);
> +void *ksmbd_alloc_file_struct(void);
> +
> +void ksmbd_destroy_buffer_pools(void);
> +int ksmbd_init_buffer_pools(void);
> +
> +#endif /* __KSMBD_BUFFER_POOL_H__ */
> 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@xxxxxxxxxx>
> + *   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))

Smack uses multiple xattrs. In addition to XATTR_NAME_SMACK you need
XATTR_NAME_SMACKEXEC, XATTR_NAME_SMACKTRANSMUTE and
XATTR_NAME_SMACKMMAP. 

Why is Smack treated specially?

> +			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;
> +}
> diff --git a/fs/cifsd/vfs.h b/fs/cifsd/vfs.h
> new file mode 100644
> index 000000000000..bbef5c20c146
> --- /dev/null
> +++ b/fs/cifsd/vfs.h
> @@ -0,0 +1,314 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + *   Copyright (C) 2016 Namjae Jeon <linkinjeon@xxxxxxxxxx>
> + *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
> + */
> +
> +#ifndef __KSMBD_VFS_H__
> +#define __KSMBD_VFS_H__
> +
> +#include <linux/file.h>
> +#include <linux/fs.h>
> +#include <linux/namei.h>
> +#include <uapi/linux/xattr.h>
> +#include <linux/posix_acl.h>
> +
> +#include "smbacl.h"
> +
> +/* STREAM XATTR PREFIX */
> +#define STREAM_PREFIX			"DosStream."
> +#define STREAM_PREFIX_LEN		(sizeof(STREAM_PREFIX) - 1)
> +#define XATTR_NAME_STREAM		(XATTR_USER_PREFIX
> STREAM_PREFIX)
> +#define XATTR_NAME_STREAM_LEN
> 	(sizeof(XATTR_NAME_STREAM) - 1)
> +
> +enum {
> +	XATTR_DOSINFO_ATTRIB		= 0x00000001,
> +	XATTR_DOSINFO_EA_SIZE		= 0x00000002,
> +	XATTR_DOSINFO_SIZE		= 0x00000004,
> +	XATTR_DOSINFO_ALLOC_SIZE	= 0x00000008,
> +	XATTR_DOSINFO_CREATE_TIME	= 0x00000010,
> +	XATTR_DOSINFO_CHANGE_TIME	= 0x00000020,
> +	XATTR_DOSINFO_ITIME		= 0x00000040
> +};
> +
> +struct xattr_dos_attrib {
> +	__u16	version;
> +	__u32	flags;
> +	__u32	attr;
> +	__u32	ea_size;
> +	__u64	size;
> +	__u64	alloc_size;
> +	__u64	create_time;
> +	__u64	change_time;
> +	__u64	itime;
> +};
> +
> +/* DOS ATTRIBUITE XATTR PREFIX */
> +#define DOS_ATTRIBUTE_PREFIX		"DOSATTRIB"
> +#define DOS_ATTRIBUTE_PREFIX_LEN
> 	(sizeof(DOS_ATTRIBUTE_PREFIX) - 1)
> +#define XATTR_NAME_DOS_ATTRIBUTE	\
> +		(XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX)
> +#define XATTR_NAME_DOS_ATTRIBUTE_LEN	\
> +		(sizeof(XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX) - 1)
> +
> +#define XATTR_SD_HASH_TYPE_SHA256	0x1
> +#define XATTR_SD_HASH_SIZE		64
> +
> +#define SMB_ACL_READ			4
> +#define SMB_ACL_WRITE			2
> +#define SMB_ACL_EXECUTE			1
> +
> +enum {
> +	SMB_ACL_TAG_INVALID = 0,
> +	SMB_ACL_USER,
> +	SMB_ACL_USER_OBJ,
> +	SMB_ACL_GROUP,
> +	SMB_ACL_GROUP_OBJ,
> +	SMB_ACL_OTHER,
> +	SMB_ACL_MASK
> +};
> +
> +struct xattr_acl_entry {
> +	int type;
> +	uid_t uid;
> +	gid_t gid;
> +	mode_t perm;
> +};
> +
> +struct xattr_smb_acl {
> +	int count;
> +	int next;
> +	struct xattr_acl_entry entries[0];
> +};
> +
> +struct xattr_ntacl {
> +	__u16	version;
> +	void	*sd_buf;
> +	__u32	sd_size;
> +	__u16	hash_type;
> +	__u8	desc[10];
> +	__u16	desc_len;
> +	__u64	current_time;
> +	__u8	hash[XATTR_SD_HASH_SIZE];
> +	__u8	posix_acl_hash[XATTR_SD_HASH_SIZE];
> +};
> +
> +/* SECURITY DESCRIPTOR XATTR PREFIX */
> +#define SD_PREFIX			"NTACL"
> +#define SD_PREFIX_LEN	(sizeof(SD_PREFIX) - 1)
> +#define XATTR_NAME_SD	\
> +		(XATTR_SECURITY_PREFIX SD_PREFIX)
> +#define XATTR_NAME_SD_LEN	\
> +		(sizeof(XATTR_SECURITY_PREFIX SD_PREFIX) - 1)
> +
> +
> +/* CreateOptions */
> +/* Flag is set, it must not be a file , valid for directory only */
> +#define FILE_DIRECTORY_FILE_LE
> 	cpu_to_le32(0x00000001)
> +#define FILE_WRITE_THROUGH_LE
> 	cpu_to_le32(0x00000002)
> +#define FILE_SEQUENTIAL_ONLY_LE
> 	cpu_to_le32(0x00000004)
> +
> +/* Should not buffer on server*/
> +#define FILE_NO_INTERMEDIATE_BUFFERING_LE
> 	cpu_to_le32(0x00000008)
> +/* MBZ */
> +#define FILE_SYNCHRONOUS_IO_ALERT_LE
> 	cpu_to_le32(0x00000010)
> +/* MBZ */
> +#define FILE_SYNCHRONOUS_IO_NONALERT_LE
> 	cpu_to_le32(0x00000020)
> +
> +/* Flaf must not be set for directory */
> +#define FILE_NON_DIRECTORY_FILE_LE
> 	cpu_to_le32(0x00000040)
> +
> +/* Should be zero */
> +#define CREATE_TREE_CONNECTION
> 	cpu_to_le32(0x00000080)
> +#define FILE_COMPLETE_IF_OPLOCKED_LE
> 	cpu_to_le32(0x00000100)
> +#define FILE_NO_EA_KNOWLEDGE_LE
> 	cpu_to_le32(0x00000200)
> +#define FILE_OPEN_REMOTE_INSTANCE
> 	cpu_to_le32(0x00000400)
> +
> +/**
> + * Doc says this is obsolete "open for recovery" flag should be zero
> + * in any case.
> + */
> +#define CREATE_OPEN_FOR_RECOVERY
> 	cpu_to_le32(0x00000400)
> +#define FILE_RANDOM_ACCESS_LE
> 	cpu_to_le32(0x00000800)
> +#define FILE_DELETE_ON_CLOSE_LE
> 	cpu_to_le32(0x00001000)
> +#define FILE_OPEN_BY_FILE_ID_LE
> 	cpu_to_le32(0x00002000)
> +#define FILE_OPEN_FOR_BACKUP_INTENT_LE
> 	cpu_to_le32(0x00004000)
> +#define FILE_NO_COMPRESSION_LE
> 	cpu_to_le32(0x00008000)
> +
> +/* Should be zero*/
> +#define FILE_OPEN_REQUIRING_OPLOCK
> 	cpu_to_le32(0x00010000)
> +#define FILE_DISALLOW_EXCLUSIVE
> 	cpu_to_le32(0x00020000)
> +#define FILE_RESERVE_OPFILTER_LE		cpu_to_le32(0x00100000)
> +#define FILE_OPEN_REPARSE_POINT_LE
> 	cpu_to_le32(0x00200000)
> +#define FILE_OPEN_NO_RECALL_LE
> 	cpu_to_le32(0x00400000)
> +
> +/* Should be zero */
> +#define FILE_OPEN_FOR_FREE_SPACE_QUERY_LE
> 	cpu_to_le32(0x00800000)
> +#define CREATE_OPTIONS_MASK
> 	cpu_to_le32(0x00FFFFFF)
> +#define CREATE_OPTION_READONLY			0x10000000
> +/* system. NB not sent over wire */
> +#define CREATE_OPTION_SPECIAL			0x20000000
> +
> +struct ksmbd_work;
> +struct ksmbd_file;
> +struct ksmbd_conn;
> +
> +struct ksmbd_dir_info {
> +	const char	*name;
> +	char		*wptr;
> +	char		*rptr;
> +	int		name_len;
> +	int		out_buf_len;
> +	int		num_entry;
> +	int		data_count;
> +	int		last_entry_offset;
> +	bool		hide_dot_file;
> +	int		flags;
> +};
> +
> +struct ksmbd_readdir_data {
> +	struct dir_context	ctx;
> +	union {
> +		void		*private;
> +		char		*dirent;
> +	};
> +
> +	unsigned int		used;
> +	unsigned int		dirent_count;
> +	unsigned int		file_attr;
> +};
> +
> +/* ksmbd kstat wrapper to get valid create time when reading dir entry */
> +struct ksmbd_kstat {
> +	struct kstat		*kstat;
> +	unsigned long long	create_time;
> +	__le32			file_attributes;
> +};
> +
> +struct ksmbd_fs_sector_size {
> +	unsigned short	logical_sector_size;
> +	unsigned int	physical_sector_size;
> +	unsigned int	optimal_io_size;
> +};
> +
> +int ksmbd_vfs_inode_permission(struct dentry *dentry, int acc_mode,
> +		bool delete);
> +int ksmbd_vfs_query_maximal_access(struct dentry *dentry, __le32
> *daccess);
> +int ksmbd_vfs_create(struct ksmbd_work *work, const char *name,
> umode_t mode);
> +int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name,
> umode_t mode);
> +int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp,
> +		 size_t count, loff_t *pos);
> +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);
> +int ksmbd_vfs_fsync(struct ksmbd_work *work, uint64_t fid, uint64_t
> p_id);
> +int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name);
> +int ksmbd_vfs_link(struct ksmbd_work *work,
> +		const char *oldname, const char *newname);
> +int ksmbd_vfs_getattr(struct path *path, struct kstat *stat);
> +int ksmbd_vfs_symlink(const char *name, const char *symname);
> +int ksmbd_vfs_readlink(struct path *path, char *buf, int lenp);
> +
> +int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file
> *fp,
> +		char *newname);
> +int ksmbd_vfs_rename_slowpath(struct ksmbd_work *work,
> +		char *oldname, char *newname);
> +
> +int ksmbd_vfs_truncate(struct ksmbd_work *work, const char *name,
> +	struct ksmbd_file *fp, loff_t size);
> +
> +struct srv_copychunk;
> +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);
> +
> +struct ksmbd_file *ksmbd_vfs_dentry_open(struct ksmbd_work *work,
> +					 const struct path *path,
> +					 int flags,
> +					 __le32 option,
> +					 int fexist);
> +
> +ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list);
> +ssize_t ksmbd_vfs_getxattr(struct dentry *dentry,
> +			   char *xattr_name,
> +			   char **xattr_buf);
> +
> +ssize_t ksmbd_vfs_casexattr_len(struct dentry *dentry,
> +				char *attr_name,
> +				int attr_name_len);
> +
> +int ksmbd_vfs_setxattr(struct dentry *dentry,
> +		       const char *attr_name,
> +		       const void *attr_value,
> +		       size_t attr_size,
> +		       int flags);
> +
> +int ksmbd_vfs_fsetxattr(const char *filename,
> +			const char *attr_name,
> +			const void *attr_value,
> +			size_t attr_size,
> +			int flags);
> +
> +int ksmbd_vfs_xattr_stream_name(char *stream_name,
> +				char **xattr_stream_name,
> +				size_t *xattr_stream_name_size,
> +				int s_type);
> +
> +int ksmbd_vfs_truncate_xattr(struct dentry *dentry, int wo_streams);
> +int ksmbd_vfs_remove_xattr(struct dentry *dentry, char *attr_name);
> +void ksmbd_vfs_xattr_free(char *xattr);
> +
> +int ksmbd_vfs_kern_path(char *name, unsigned int flags, struct path
> *path,
> +		bool caseless);
> +int ksmbd_vfs_empty_dir(struct ksmbd_file *fp);
> +void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option);
> +int ksmbd_vfs_lock(struct file *filp, int cmd, struct file_lock *flock);
> +int ksmbd_vfs_readdir(struct file *file, struct ksmbd_readdir_data *rdata);
> +int ksmbd_vfs_alloc_size(struct ksmbd_work *work,
> +			 struct ksmbd_file *fp,
> +			 loff_t len);
> +int ksmbd_vfs_zero_data(struct ksmbd_work *work,
> +			 struct ksmbd_file *fp,
> +			 loff_t off,
> +			 loff_t len);
> +
> +struct file_allocated_range_buffer;
> +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);
> +int ksmbd_vfs_unlink(struct dentry *dir, struct dentry *dentry);
> +unsigned short ksmbd_vfs_logical_sector_size(struct inode *inode);
> +void ksmbd_vfs_smb2_sector_size(struct inode *inode,
> +				struct ksmbd_fs_sector_size *fs_ss);
> +void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat);
> +
> +int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
> +				struct dentry *dentry,
> +				struct ksmbd_kstat *ksmbd_kstat);
> +
> +int ksmbd_vfs_posix_lock_wait(struct file_lock *flock);
> +int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long
> timeout);
> +void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock);
> +
> +int ksmbd_vfs_remove_acl_xattrs(struct dentry *dentry);
> +int ksmbd_vfs_remove_sd_xattrs(struct dentry *dentry);
> +int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn, struct dentry
> *dentry,
> +		struct smb_ntsd *pntsd, int len);
> +int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn, struct dentry
> *dentry,
> +		struct smb_ntsd **pntsd);
> +int ksmbd_vfs_set_dos_attrib_xattr(struct dentry *dentry,
> +		struct xattr_dos_attrib *da);
> +int ksmbd_vfs_get_dos_attrib_xattr(struct dentry *dentry,
> +		struct xattr_dos_attrib *da);
> +struct posix_acl *ksmbd_vfs_posix_acl_alloc(int count, gfp_t flags);
> +struct posix_acl *ksmbd_vfs_get_acl(struct inode *inode, int type);
> +int ksmbd_vfs_set_posix_acl(struct inode *inode, int type,
> +		struct posix_acl *acl);
> +int ksmbd_vfs_set_init_posix_acl(struct inode *inode);
> +int ksmbd_vfs_inherit_posix_acl(struct inode *inode,
> +		struct inode *parent_inode);
> +#endif /* __KSMBD_VFS_H__ */
> diff --git a/fs/cifsd/vfs_cache.c b/fs/cifsd/vfs_cache.c
> new file mode 100644
> index 000000000000..af92fab5b7ae
> --- /dev/null
> +++ b/fs/cifsd/vfs_cache.c
> @@ -0,0 +1,851 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2016 Namjae Jeon <linkinjeon@xxxxxxxxxx>
> + * Copyright (C) 2019 Samsung Electronics Co., Ltd.
> + */
> +
> +#include <linux/fs.h>
> +#include <linux/slab.h>
> +#include <linux/vmalloc.h>
> +
> +#include "glob.h"
> +#include "vfs_cache.h"
> +#include "buffer_pool.h"
> +#include "oplock.h"
> +#include "vfs.h"
> +#include "connection.h"
> +#include "mgmt/tree_connect.h"
> +#include "mgmt/user_session.h"
> +#include "smb_common.h"
> +
> +#define S_DEL_PENDING			1
> +#define S_DEL_ON_CLS			2
> +#define S_DEL_ON_CLS_STREAM		8
> +
> +static unsigned int inode_hash_mask __read_mostly;
> +static unsigned int inode_hash_shift __read_mostly;
> +static struct hlist_head *inode_hashtable __read_mostly;
> +static DEFINE_RWLOCK(inode_hash_lock);
> +
> +static struct ksmbd_file_table global_ft;
> +static atomic_long_t fd_limit;
> +
> +void ksmbd_set_fd_limit(unsigned long limit)
> +{
> +	limit = min(limit, get_max_files());
> +	atomic_long_set(&fd_limit, limit);
> +}
> +
> +static bool fd_limit_depleted(void)
> +{
> +	long v = atomic_long_dec_return(&fd_limit);
> +
> +	if (v >= 0)
> +		return false;
> +	atomic_long_inc(&fd_limit);
> +	return true;
> +}
> +
> +static void fd_limit_close(void)
> +{
> +	atomic_long_inc(&fd_limit);
> +}
> +
> +/*
> + * INODE hash
> + */
> +
> +static unsigned long inode_hash(struct super_block *sb, unsigned long
> hashval)
> +{
> +	unsigned long tmp;
> +
> +	tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME +
> hashval) /
> +		L1_CACHE_BYTES;
> +	tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> inode_hash_shift);
> +	return tmp & inode_hash_mask;
> +}
> +
> +static struct ksmbd_inode *__ksmbd_inode_lookup(struct inode *inode)
> +{
> +	struct hlist_head *head = inode_hashtable +
> +		inode_hash(inode->i_sb, inode->i_ino);
> +	struct ksmbd_inode *ci = NULL, *ret_ci = NULL;
> +
> +	hlist_for_each_entry(ci, head, m_hash) {
> +		if (ci->m_inode == inode) {
> +			if (atomic_inc_not_zero(&ci->m_count))
> +				ret_ci = ci;
> +			break;
> +		}
> +	}
> +	return ret_ci;
> +}
> +
> +static struct ksmbd_inode *ksmbd_inode_lookup(struct ksmbd_file *fp)
> +{
> +	return __ksmbd_inode_lookup(FP_INODE(fp));
> +}
> +
> +static struct ksmbd_inode *ksmbd_inode_lookup_by_vfsinode(struct
> inode *inode)
> +{
> +	struct ksmbd_inode *ci;
> +
> +	read_lock(&inode_hash_lock);
> +	ci = __ksmbd_inode_lookup(inode);
> +	read_unlock(&inode_hash_lock);
> +	return ci;
> +}
> +
> +int ksmbd_query_inode_status(struct inode *inode)
> +{
> +	struct ksmbd_inode *ci;
> +	int ret = KSMBD_INODE_STATUS_UNKNOWN;
> +
> +	read_lock(&inode_hash_lock);
> +	ci = __ksmbd_inode_lookup(inode);
> +	if (ci) {
> +		ret = KSMBD_INODE_STATUS_OK;
> +		if (ci->m_flags & S_DEL_PENDING)
> +			ret = KSMBD_INODE_STATUS_PENDING_DELETE;
> +		atomic_dec(&ci->m_count);
> +	}
> +	read_unlock(&inode_hash_lock);
> +	return ret;
> +}
> +
> +bool ksmbd_inode_pending_delete(struct ksmbd_file *fp)
> +{
> +	return (fp->f_ci->m_flags & S_DEL_PENDING);
> +}
> +
> +void ksmbd_set_inode_pending_delete(struct ksmbd_file *fp)
> +{
> +	fp->f_ci->m_flags |= S_DEL_PENDING;
> +}
> +
> +void ksmbd_clear_inode_pending_delete(struct ksmbd_file *fp)
> +{
> +	fp->f_ci->m_flags &= ~S_DEL_PENDING;
> +}
> +
> +void ksmbd_fd_set_delete_on_close(struct ksmbd_file *fp,
> +				  int file_info)
> +{
> +	if (ksmbd_stream_fd(fp)) {
> +		fp->f_ci->m_flags |= S_DEL_ON_CLS_STREAM;
> +		return;
> +	}
> +
> +	fp->f_ci->m_flags |= S_DEL_ON_CLS;
> +}
> +
> +static void ksmbd_inode_hash(struct ksmbd_inode *ci)
> +{
> +	struct hlist_head *b = inode_hashtable +
> +		inode_hash(ci->m_inode->i_sb, ci->m_inode->i_ino);
> +
> +	hlist_add_head(&ci->m_hash, b);
> +}
> +
> +static void ksmbd_inode_unhash(struct ksmbd_inode *ci)
> +{
> +	write_lock(&inode_hash_lock);
> +	hlist_del_init(&ci->m_hash);
> +	write_unlock(&inode_hash_lock);
> +}
> +
> +static int ksmbd_inode_init(struct ksmbd_inode *ci, struct ksmbd_file *fp)
> +{
> +	ci->m_inode = FP_INODE(fp);
> +	atomic_set(&ci->m_count, 1);
> +	atomic_set(&ci->op_count, 0);
> +	atomic_set(&ci->sop_count, 0);
> +	ci->m_flags = 0;
> +	ci->m_fattr = 0;
> +	INIT_LIST_HEAD(&ci->m_fp_list);
> +	INIT_LIST_HEAD(&ci->m_op_list);
> +	rwlock_init(&ci->m_lock);
> +	return 0;
> +}
> +
> +static struct ksmbd_inode *ksmbd_inode_get(struct ksmbd_file *fp)
> +{
> +	struct ksmbd_inode *ci, *tmpci;
> +	int rc;
> +
> +	read_lock(&inode_hash_lock);
> +	ci = ksmbd_inode_lookup(fp);
> +	read_unlock(&inode_hash_lock);
> +	if (ci)
> +		return ci;
> +
> +	ci = kmalloc(sizeof(struct ksmbd_inode), GFP_KERNEL);
> +	if (!ci)
> +		return NULL;
> +
> +	rc = ksmbd_inode_init(ci, fp);
> +	if (rc) {
> +		ksmbd_err("inode initialized failed\n");
> +		kfree(ci);
> +		return NULL;
> +	}
> +
> +	write_lock(&inode_hash_lock);
> +	tmpci = ksmbd_inode_lookup(fp);
> +	if (!tmpci) {
> +		ksmbd_inode_hash(ci);
> +	} else {
> +		kfree(ci);
> +		ci = tmpci;
> +	}
> +	write_unlock(&inode_hash_lock);
> +	return ci;
> +}
> +
> +static void ksmbd_inode_free(struct ksmbd_inode *ci)
> +{
> +	ksmbd_inode_unhash(ci);
> +	kfree(ci);
> +}
> +
> +static void ksmbd_inode_put(struct ksmbd_inode *ci)
> +{
> +	if (atomic_dec_and_test(&ci->m_count))
> +		ksmbd_inode_free(ci);
> +}
> +
> +int __init ksmbd_inode_hash_init(void)
> +{
> +	unsigned int loop;
> +	unsigned long numentries = 16384;
> +	unsigned long bucketsize = sizeof(struct hlist_head);
> +	unsigned long size;
> +
> +	inode_hash_shift = ilog2(numentries);
> +	inode_hash_mask = (1 << inode_hash_shift) - 1;
> +
> +	size = bucketsize << inode_hash_shift;
> +
> +	/* init master fp hash table */
> +	inode_hashtable = vmalloc(size);
> +	if (!inode_hashtable)
> +		return -ENOMEM;
> +
> +	for (loop = 0; loop < (1U << inode_hash_shift); loop++)
> +		INIT_HLIST_HEAD(&inode_hashtable[loop]);
> +	return 0;
> +}
> +
> +void __exit ksmbd_release_inode_hash(void)
> +{
> +	vfree(inode_hashtable);
> +}
> +
> +static void __ksmbd_inode_close(struct ksmbd_file *fp)
> +{
> +	struct dentry *dir, *dentry;
> +	struct ksmbd_inode *ci = fp->f_ci;
> +	int err;
> +	struct file *filp;
> +
> +	filp = fp->filp;
> +	if (ksmbd_stream_fd(fp) && (ci->m_flags &
> S_DEL_ON_CLS_STREAM)) {
> +		ci->m_flags &= ~S_DEL_ON_CLS_STREAM;
> +		err = ksmbd_vfs_remove_xattr(filp->f_path.dentry,
> +					     fp->stream.name);
> +		if (err)
> +			ksmbd_err("remove xattr failed : %s\n",
> +				fp->stream.name);
> +	}
> +
> +	if (atomic_dec_and_test(&ci->m_count)) {
> +		write_lock(&ci->m_lock);
> +		if (ci->m_flags & (S_DEL_ON_CLS | S_DEL_PENDING)) {
> +			dentry = filp->f_path.dentry;
> +			dir = dentry->d_parent;
> +			ci->m_flags &= ~(S_DEL_ON_CLS | S_DEL_PENDING);
> +			write_unlock(&ci->m_lock);
> +			ksmbd_vfs_unlink(dir, dentry);
> +			write_lock(&ci->m_lock);
> +		}
> +		write_unlock(&ci->m_lock);
> +
> +		ksmbd_inode_free(ci);
> +	}
> +}
> +
> +static void __ksmbd_remove_durable_fd(struct ksmbd_file *fp)
> +{
> +	if (!HAS_FILE_ID(fp->persistent_id))
> +		return;
> +
> +	write_lock(&global_ft.lock);
> +	idr_remove(global_ft.idr, fp->persistent_id);
> +	write_unlock(&global_ft.lock);
> +}
> +
> +static void __ksmbd_remove_fd(struct ksmbd_file_table *ft,
> +			      struct ksmbd_file *fp)
> +{
> +	if (!HAS_FILE_ID(fp->volatile_id))
> +		return;
> +
> +	write_lock(&fp->f_ci->m_lock);
> +	list_del_init(&fp->node);
> +	write_unlock(&fp->f_ci->m_lock);
> +
> +	write_lock(&ft->lock);
> +	idr_remove(ft->idr, fp->volatile_id);
> +	write_unlock(&ft->lock);
> +}
> +
> +static void __ksmbd_close_fd(struct ksmbd_file_table *ft,
> +			     struct ksmbd_file *fp)
> +{
> +	struct file *filp;
> +
> +	fd_limit_close();
> +	__ksmbd_remove_durable_fd(fp);
> +	__ksmbd_remove_fd(ft, fp);
> +
> +	close_id_del_oplock(fp);
> +	filp = fp->filp;
> +
> +	__ksmbd_inode_close(fp);
> +	if (!IS_ERR_OR_NULL(filp))
> +		fput(filp);
> +	kfree(fp->filename);
> +	if (ksmbd_stream_fd(fp))
> +		kfree(fp->stream.name);
> +	ksmbd_free_file_struct(fp);
> +}
> +
> +static struct ksmbd_file *ksmbd_fp_get(struct ksmbd_file *fp)
> +{
> +	if (!atomic_inc_not_zero(&fp->refcount))
> +		return NULL;
> +	return fp;
> +}
> +
> +static struct ksmbd_file *__ksmbd_lookup_fd(struct ksmbd_file_table *ft,
> +					    unsigned int id)
> +{
> +	bool unclaimed = true;
> +	struct ksmbd_file *fp;
> +
> +	read_lock(&ft->lock);
> +	fp = idr_find(ft->idr, id);
> +	if (fp)
> +		fp = ksmbd_fp_get(fp);
> +
> +	if (fp && fp->f_ci) {
> +		read_lock(&fp->f_ci->m_lock);
> +		unclaimed = list_empty(&fp->node);
> +		read_unlock(&fp->f_ci->m_lock);
> +	}
> +	read_unlock(&ft->lock);
> +
> +	if (fp && unclaimed) {
> +		atomic_dec(&fp->refcount);
> +		return NULL;
> +	}
> +	return fp;
> +}
> +
> +static void __put_fd_final(struct ksmbd_work *work,
> +			   struct ksmbd_file *fp)
> +{
> +	__ksmbd_close_fd(&work->sess->file_table, fp);
> +	atomic_dec(&work->conn->stats.open_files_count);
> +}
> +
> +static void set_close_state_blocked_works(struct ksmbd_file *fp)
> +{
> +	struct ksmbd_work *cancel_work, *ctmp;
> +
> +	spin_lock(&fp->f_lock);
> +	list_for_each_entry_safe(cancel_work, ctmp, &fp->blocked_works,
> +			fp_entry) {
> +		list_del(&cancel_work->fp_entry);
> +		cancel_work->state = KSMBD_WORK_CLOSED;
> +		cancel_work->cancel_fn(cancel_work->cancel_argv);
> +	}
> +	spin_unlock(&fp->f_lock);
> +}
> +
> +int ksmbd_close_fd(struct ksmbd_work *work, unsigned int id)
> +{
> +	struct ksmbd_file	*fp;
> +	struct ksmbd_file_table	*ft;
> +
> +	if (!HAS_FILE_ID(id))
> +		return 0;
> +
> +	ft = &work->sess->file_table;
> +	read_lock(&ft->lock);
> +	fp = idr_find(ft->idr, id);
> +	if (fp) {
> +		set_close_state_blocked_works(fp);
> +
> +		if (!atomic_dec_and_test(&fp->refcount))
> +			fp = NULL;
> +	}
> +	read_unlock(&ft->lock);
> +
> +	if (!fp)
> +		return -EINVAL;
> +
> +	__put_fd_final(work, fp);
> +	return 0;
> +}
> +
> +void ksmbd_fd_put(struct ksmbd_work *work,
> +		  struct ksmbd_file *fp)
> +{
> +	if (!fp)
> +		return;
> +
> +	if (!atomic_dec_and_test(&fp->refcount))
> +		return;
> +	__put_fd_final(work, fp);
> +}
> +
> +static bool __sanity_check(struct ksmbd_tree_connect *tcon,
> +			   struct ksmbd_file *fp)
> +{
> +	if (!fp)
> +		return false;
> +	if (fp->tcon != tcon)
> +		return false;
> +	return true;
> +}
> +
> +struct ksmbd_file *ksmbd_lookup_foreign_fd(struct ksmbd_work *work,
> +					   unsigned int id)
> +{
> +	return __ksmbd_lookup_fd(&work->sess->file_table, id);
> +}
> +
> +struct ksmbd_file *ksmbd_lookup_fd_fast(struct ksmbd_work *work,
> +					unsigned int id)
> +{
> +	struct ksmbd_file *fp = __ksmbd_lookup_fd(&work->sess-
> >file_table, id);
> +
> +	if (__sanity_check(work->tcon, fp))
> +		return fp;
> +
> +	ksmbd_fd_put(work, fp);
> +	return NULL;
> +}
> +
> +struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work,
> +					unsigned int id,
> +					unsigned int pid)
> +{
> +	struct ksmbd_file *fp;
> +
> +	if (!HAS_FILE_ID(id)) {
> +		id = work->compound_fid;
> +		pid = work->compound_pfid;
> +	}
> +
> +	if (!HAS_FILE_ID(id))
> +		return NULL;
> +
> +	fp = __ksmbd_lookup_fd(&work->sess->file_table, id);
> +	if (!__sanity_check(work->tcon, fp)) {
> +		ksmbd_fd_put(work, fp);
> +		return NULL;
> +	}
> +	if (fp->persistent_id != pid) {
> +		ksmbd_fd_put(work, fp);
> +		return NULL;
> +	}
> +	return fp;
> +}
> +
> +struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id)
> +{
> +	return __ksmbd_lookup_fd(&global_ft, id);
> +}
> +
> +int ksmbd_close_fd_app_id(struct ksmbd_work *work,
> +			  char *app_id)
> +{
> +	struct ksmbd_file	*fp = NULL;
> +	unsigned int		id;
> +
> +	read_lock(&global_ft.lock);
> +	idr_for_each_entry(global_ft.idr, fp, id) {
> +		if (!memcmp(fp->app_instance_id,
> +			    app_id,
> +			    SMB2_CREATE_GUID_SIZE)) {
> +			if (!atomic_dec_and_test(&fp->refcount))
> +				fp = NULL;
> +			break;
> +		}
> +	}
> +	read_unlock(&global_ft.lock);
> +
> +	if (!fp)
> +		return -EINVAL;
> +
> +	__put_fd_final(work, fp);
> +	return 0;
> +}
> +
> +struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid)
> +{
> +	struct ksmbd_file	*fp = NULL;
> +	unsigned int		id;
> +
> +	read_lock(&global_ft.lock);
> +	idr_for_each_entry(global_ft.idr, fp, id) {
> +		if (!memcmp(fp->create_guid,
> +			    cguid,
> +			    SMB2_CREATE_GUID_SIZE)) {
> +			fp = ksmbd_fp_get(fp);
> +			break;
> +		}
> +	}
> +	read_unlock(&global_ft.lock);
> +
> +	return fp;
> +}
> +
> +struct ksmbd_file *ksmbd_lookup_fd_filename(struct ksmbd_work *work,
> +					    char *filename)
> +{
> +	struct ksmbd_file	*fp = NULL;
> +	unsigned int		id;
> +
> +	read_lock(&work->sess->file_table.lock);
> +	idr_for_each_entry(work->sess->file_table.idr, fp, id) {
> +		if (!strcmp(fp->filename, filename)) {
> +			fp = ksmbd_fp_get(fp);
> +			break;
> +		}
> +	}
> +	read_unlock(&work->sess->file_table.lock);
> +
> +	return fp;
> +}
> +
> +struct ksmbd_file *ksmbd_lookup_fd_inode(struct inode *inode)
> +{
> +	struct ksmbd_file	*lfp;
> +	struct ksmbd_inode	*ci;
> +	struct list_head	*cur;
> +
> +	ci = ksmbd_inode_lookup_by_vfsinode(inode);
> +	if (!ci)
> +		return NULL;
> +
> +	read_lock(&ci->m_lock);
> +	list_for_each(cur, &ci->m_fp_list) {
> +		lfp = list_entry(cur, struct ksmbd_file, node);
> +		if (inode == FP_INODE(lfp)) {
> +			atomic_dec(&ci->m_count);
> +			read_unlock(&ci->m_lock);
> +			return lfp;
> +		}
> +	}
> +	atomic_dec(&ci->m_count);
> +	read_unlock(&ci->m_lock);
> +	return NULL;
> +}
> +
> +#define OPEN_ID_TYPE_VOLATILE_ID	(0)
> +#define OPEN_ID_TYPE_PERSISTENT_ID	(1)
> +
> +static void __open_id_set(struct ksmbd_file *fp, unsigned int id, int type)
> +{
> +	if (type == OPEN_ID_TYPE_VOLATILE_ID)
> +		fp->volatile_id = id;
> +	if (type == OPEN_ID_TYPE_PERSISTENT_ID)
> +		fp->persistent_id = id;
> +}
> +
> +static int __open_id(struct ksmbd_file_table *ft,
> +		     struct ksmbd_file *fp,
> +		     int type)
> +{
> +	unsigned int		id = 0;
> +	int			ret;
> +
> +	if (type == OPEN_ID_TYPE_VOLATILE_ID && fd_limit_depleted()) {
> +		__open_id_set(fp, KSMBD_NO_FID, type);
> +		return -EMFILE;
> +	}
> +
> +	idr_preload(GFP_KERNEL);
> +	write_lock(&ft->lock);
> +	ret = idr_alloc_cyclic(ft->idr, fp, 0, INT_MAX, GFP_NOWAIT);
> +	if (ret >= 0) {
> +		id = ret;
> +		ret = 0;
> +	} else {
> +		id = KSMBD_NO_FID;
> +		fd_limit_close();
> +	}
> +
> +	__open_id_set(fp, id, type);
> +	write_unlock(&ft->lock);
> +	idr_preload_end();
> +	return ret;
> +}
> +
> +unsigned int ksmbd_open_durable_fd(struct ksmbd_file *fp)
> +{
> +	__open_id(&global_ft, fp, OPEN_ID_TYPE_PERSISTENT_ID);
> +	return fp->persistent_id;
> +}
> +
> +struct ksmbd_file *ksmbd_open_fd(struct ksmbd_work *work,
> +				 struct file *filp)
> +{
> +	struct ksmbd_file	*fp;
> +	int ret;
> +
> +	fp = ksmbd_alloc_file_struct();
> +	if (!fp) {
> +		ksmbd_err("Failed to allocate memory\n");
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	INIT_LIST_HEAD(&fp->blocked_works);
> +	INIT_LIST_HEAD(&fp->node);
> +	spin_lock_init(&fp->f_lock);
> +	atomic_set(&fp->refcount, 1);
> +
> +	fp->filp		= filp;
> +	fp->conn		= work->sess->conn;
> +	fp->tcon		= work->tcon;
> +	fp->volatile_id		= KSMBD_NO_FID;
> +	fp->persistent_id	= KSMBD_NO_FID;
> +	fp->f_ci		= ksmbd_inode_get(fp);
> +
> +	if (!fp->f_ci) {
> +		ksmbd_free_file_struct(fp);
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	ret = __open_id(&work->sess->file_table, fp,
> OPEN_ID_TYPE_VOLATILE_ID);
> +	if (ret) {
> +		ksmbd_inode_put(fp->f_ci);
> +		ksmbd_free_file_struct(fp);
> +		return ERR_PTR(ret);
> +	}
> +
> +	atomic_inc(&work->conn->stats.open_files_count);
> +	return fp;
> +}
> +
> +static inline bool is_reconnectable(struct ksmbd_file *fp)
> +{
> +	struct oplock_info *opinfo = opinfo_get(fp);
> +	bool reconn = false;
> +
> +	if (!opinfo)
> +		return false;
> +
> +	if (opinfo->op_state != OPLOCK_STATE_NONE) {
> +		opinfo_put(opinfo);
> +		return false;
> +	}
> +
> +	if (fp->is_resilient || fp->is_persistent)
> +		reconn = true;
> +	else if (fp->is_durable && opinfo->is_lease &&
> +			opinfo->o_lease->state &
> SMB2_LEASE_HANDLE_CACHING_LE)
> +		reconn = true;
> +
> +	else if (fp->is_durable && opinfo->level ==
> SMB2_OPLOCK_LEVEL_BATCH)
> +		reconn = true;
> +
> +	opinfo_put(opinfo);
> +	return reconn;
> +}
> +
> +static int
> +__close_file_table_ids(struct ksmbd_file_table *ft,
> +		       struct ksmbd_tree_connect *tcon,
> +		       bool (*skip)(struct ksmbd_tree_connect *tcon,
> +				    struct ksmbd_file *fp))
> +{
> +	unsigned int			id;
> +	struct ksmbd_file		*fp;
> +	int				num = 0;
> +
> +	idr_for_each_entry(ft->idr, fp, id) {
> +		if (skip(tcon, fp))
> +			continue;
> +
> +		set_close_state_blocked_works(fp);
> +
> +		if (!atomic_dec_and_test(&fp->refcount))
> +			continue;
> +		__ksmbd_close_fd(ft, fp);
> +		num++;
> +	}
> +	return num;
> +}
> +
> +static bool tree_conn_fd_check(struct ksmbd_tree_connect *tcon,
> +			       struct ksmbd_file *fp)
> +{
> +	return fp->tcon != tcon;
> +}
> +
> +static bool session_fd_check(struct ksmbd_tree_connect *tcon,
> +			     struct ksmbd_file *fp)
> +{
> +	if (!is_reconnectable(fp))
> +		return false;
> +
> +	fp->conn = NULL;
> +	fp->tcon = NULL;
> +	fp->volatile_id = KSMBD_NO_FID;
> +	return true;
> +}
> +
> +void ksmbd_close_tree_conn_fds(struct ksmbd_work *work)
> +{
> +	int num = __close_file_table_ids(&work->sess->file_table,
> +					 work->tcon,
> +					 tree_conn_fd_check);
> +
> +	atomic_sub(num, &work->conn->stats.open_files_count);
> +}
> +
> +void ksmbd_close_session_fds(struct ksmbd_work *work)
> +{
> +	int num = __close_file_table_ids(&work->sess->file_table,
> +					 work->tcon,
> +					 session_fd_check);
> +
> +	atomic_sub(num, &work->conn->stats.open_files_count);
> +}
> +
> +int ksmbd_init_global_file_table(void)
> +{
> +	return ksmbd_init_file_table(&global_ft);
> +}
> +
> +void ksmbd_free_global_file_table(void)
> +{
> +	struct ksmbd_file	*fp = NULL;
> +	unsigned int		id;
> +
> +	idr_for_each_entry(global_ft.idr, fp, id) {
> +		__ksmbd_remove_durable_fd(fp);
> +		ksmbd_free_file_struct(fp);
> +	}
> +
> +	ksmbd_destroy_file_table(&global_ft);
> +}
> +
> +int ksmbd_reopen_durable_fd(struct ksmbd_work *work,
> +			    struct ksmbd_file *fp)
> +{
> +	if (!fp->is_durable || fp->conn || fp->tcon) {
> +		ksmbd_err("Invalid durable fd [%p:%p]\n",
> +				fp->conn, fp->tcon);
> +		return -EBADF;
> +	}
> +
> +	if (HAS_FILE_ID(fp->volatile_id)) {
> +		ksmbd_err("Still in use durable fd: %u\n", fp->volatile_id);
> +		return -EBADF;
> +	}
> +
> +	fp->conn = work->sess->conn;
> +	fp->tcon = work->tcon;
> +
> +	__open_id(&work->sess->file_table, fp,
> OPEN_ID_TYPE_VOLATILE_ID);
> +	if (!HAS_FILE_ID(fp->volatile_id)) {
> +		fp->conn = NULL;
> +		fp->tcon = NULL;
> +		return -EBADF;
> +	}
> +	return 0;
> +}
> +
> +static void close_fd_list(struct ksmbd_work *work, struct list_head *head)
> +{
> +	while (!list_empty(head)) {
> +		struct ksmbd_file *fp;
> +
> +		fp = list_first_entry(head, struct ksmbd_file, node);
> +		list_del_init(&fp->node);
> +
> +		__ksmbd_close_fd(&work->sess->file_table, fp);
> +	}
> +}
> +
> +int ksmbd_close_inode_fds(struct ksmbd_work *work, struct inode
> *inode)
> +{
> +	struct ksmbd_inode *ci;
> +	bool unlinked = true;
> +	struct ksmbd_file *fp, *fptmp;
> +	LIST_HEAD(dispose);
> +
> +	ci = ksmbd_inode_lookup_by_vfsinode(inode);
> +	if (!ci)
> +		return true;
> +
> +	if (ci->m_flags & (S_DEL_ON_CLS | S_DEL_PENDING))
> +		unlinked = false;
> +
> +	write_lock(&ci->m_lock);
> +	list_for_each_entry_safe(fp, fptmp, &ci->m_fp_list, node) {
> +		if (fp->conn)
> +			continue;
> +
> +		list_del(&fp->node);
> +		list_add(&fp->node, &dispose);
> +	}
> +	atomic_dec(&ci->m_count);
> +	write_unlock(&ci->m_lock);
> +
> +	close_fd_list(work, &dispose);
> +	return unlinked;
> +}
> +
> +int ksmbd_file_table_flush(struct ksmbd_work *work)
> +{
> +	struct ksmbd_file	*fp = NULL;
> +	unsigned int		id;
> +	int			ret;
> +
> +	read_lock(&work->sess->file_table.lock);
> +	idr_for_each_entry(work->sess->file_table.idr, fp, id) {
> +		ret = ksmbd_vfs_fsync(work, fp->volatile_id,
> KSMBD_NO_FID);
> +		if (ret)
> +			break;
> +	}
> +	read_unlock(&work->sess->file_table.lock);
> +	return ret;
> +}
> +
> +int ksmbd_init_file_table(struct ksmbd_file_table *ft)
> +{
> +	ft->idr = ksmbd_alloc(sizeof(struct idr));
> +	if (!ft->idr)
> +		return -ENOMEM;
> +
> +	idr_init(ft->idr);
> +	rwlock_init(&ft->lock);
> +	return 0;
> +}
> +
> +void ksmbd_destroy_file_table(struct ksmbd_file_table *ft)
> +{
> +	if (!ft->idr)
> +		return;
> +
> +	__close_file_table_ids(ft, NULL, session_fd_check);
> +	idr_destroy(ft->idr);
> +	ksmbd_free(ft->idr);
> +	ft->idr = NULL;
> +}
> diff --git a/fs/cifsd/vfs_cache.h b/fs/cifsd/vfs_cache.h
> new file mode 100644
> index 000000000000..7d23657c86c6
> --- /dev/null
> +++ b/fs/cifsd/vfs_cache.h
> @@ -0,0 +1,213 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + *   Copyright (C) 2019 Samsung Electronics Co., Ltd.
> + */
> +
> +#ifndef __VFS_CACHE_H__
> +#define __VFS_CACHE_H__
> +
> +#include <linux/version.h>
> +#include <linux/file.h>
> +#include <linux/fs.h>
> +#include <linux/rwsem.h>
> +#include <linux/spinlock.h>
> +#include <linux/idr.h>
> +#include <linux/workqueue.h>
> +
> +#include "vfs.h"
> +
> +/* Windows style file permissions for extended response */
> +#define	FILE_GENERIC_ALL	0x1F01FF
> +#define	FILE_GENERIC_READ	0x120089
> +#define	FILE_GENERIC_WRITE	0x120116
> +#define	FILE_GENERIC_EXECUTE	0X1200a0
> +
> +#define KSMBD_START_FID		0
> +#define KSMBD_NO_FID		(UINT_MAX)
> +#define SMB2_NO_FID		(0xFFFFFFFFFFFFFFFFULL)
> +
> +#define FP_FILENAME(fp)		fp->filp->f_path.dentry-
> >d_name.name
> +#define FP_INODE(fp)		fp->filp->f_path.dentry->d_inode
> +#define PARENT_INODE(fp)	fp->filp->f_path.dentry->d_parent->d_inode
> +
> +#define ATTR_FP(fp) (fp->attrib_only && \
> +		(fp->cdoption != FILE_OVERWRITE_IF_LE && \
> +		fp->cdoption != FILE_OVERWRITE_LE && \
> +		fp->cdoption != FILE_SUPERSEDE_LE))
> +
> +struct ksmbd_conn;
> +struct ksmbd_session;
> +
> +struct ksmbd_lock {
> +	struct file_lock *fl;
> +	struct list_head glist;
> +	struct list_head llist;
> +	unsigned int flags;
> +	int cmd;
> +	int zero_len;
> +	unsigned long long start;
> +	unsigned long long end;
> +};
> +
> +struct stream {
> +	char *name;
> +	ssize_t size;
> +};
> +
> +struct ksmbd_inode {
> +	rwlock_t			m_lock;
> +	atomic_t			m_count;
> +	atomic_t			op_count;
> +	/* opinfo count for streams */
> +	atomic_t			sop_count;
> +	struct inode			*m_inode;
> +	unsigned int			m_flags;
> +	struct hlist_node		m_hash;
> +	struct list_head		m_fp_list;
> +	struct list_head		m_op_list;
> +	struct oplock_info		*m_opinfo;
> +	__le32				m_fattr;
> +};
> +
> +struct ksmbd_file {
> +	struct file			*filp;
> +	char				*filename;
> +	unsigned int			persistent_id;
> +	unsigned int			volatile_id;
> +
> +	spinlock_t			f_lock;
> +
> +	struct ksmbd_inode		*f_ci;
> +	struct ksmbd_inode		*f_parent_ci;
> +	struct oplock_info __rcu	*f_opinfo;
> +	struct ksmbd_conn		*conn;
> +	struct ksmbd_tree_connect	*tcon;
> +
> +	atomic_t			refcount;
> +	__le32				daccess;
> +	__le32				saccess;
> +	__le32				coption;
> +	__le32				cdoption;
> +	__u64				create_time;
> +	__u64				itime;
> +
> +	bool				is_durable;
> +	bool				is_resilient;
> +	bool				is_persistent;
> +	bool				is_nt_open;
> +	bool				attrib_only;
> +
> +	char				client_guid[16];
> +	char				create_guid[16];
> +	char				app_instance_id[16];
> +
> +	struct stream			stream;
> +	struct list_head		node;
> +	struct list_head		blocked_works;
> +
> +	int				durable_timeout;
> +
> +	/* for SMB1 */
> +	int				pid;
> +
> +	/* conflict lock fail count for SMB1 */
> +	unsigned int			cflock_cnt;
> +	/* last lock failure start offset for SMB1 */
> +	unsigned long long		llock_fstart;
> +
> +	int				dirent_offset;
> +
> +	/* if ls is happening on directory, below is valid*/
> +	struct ksmbd_readdir_data	readdir_data;
> +	int				dot_dotdot[2];
> +};
> +
> +static inline void set_ctx_actor(struct dir_context *ctx,
> +				 filldir_t actor)
> +{
> +	ctx->actor = actor;
> +}
> +
> +#define KSMBD_NR_OPEN_DEFAULT BITS_PER_LONG
> +
> +struct ksmbd_file_table {
> +	rwlock_t		lock;
> +	struct idr		*idr;
> +};
> +
> +static inline bool HAS_FILE_ID(unsigned long long req)
> +{
> +	unsigned int id = (unsigned int)req;
> +
> +	return id < KSMBD_NO_FID;
> +}
> +
> +static inline bool ksmbd_stream_fd(struct ksmbd_file *fp)
> +{
> +	return fp->stream.name != NULL;
> +}
> +
> +int ksmbd_init_file_table(struct ksmbd_file_table *ft);
> +void ksmbd_destroy_file_table(struct ksmbd_file_table *ft);
> +
> +int ksmbd_close_fd(struct ksmbd_work *work, unsigned int id);
> +
> +struct ksmbd_file *ksmbd_lookup_fd_fast(struct ksmbd_work *work,
> +					unsigned int id);
> +struct ksmbd_file *ksmbd_lookup_foreign_fd(struct ksmbd_work *work,
> +					   unsigned int id);
> +struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work,
> +					unsigned int id,
> +					unsigned int pid);
> +
> +void ksmbd_fd_put(struct ksmbd_work *work, struct ksmbd_file *fp);
> +
> +int ksmbd_close_fd_app_id(struct ksmbd_work *work, char *app_id);
> +struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id);
> +struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid);
> +struct ksmbd_file *ksmbd_lookup_fd_filename(struct ksmbd_work *work,
> +					    char *filename);
> +struct ksmbd_file *ksmbd_lookup_fd_inode(struct inode *inode);
> +
> +unsigned int ksmbd_open_durable_fd(struct ksmbd_file *fp);
> +
> +struct ksmbd_file *ksmbd_open_fd(struct ksmbd_work *work,
> +				 struct file *filp);
> +
> +void ksmbd_close_tree_conn_fds(struct ksmbd_work *work);
> +void ksmbd_close_session_fds(struct ksmbd_work *work);
> +
> +int ksmbd_close_inode_fds(struct ksmbd_work *work, struct inode
> *inode);
> +
> +int ksmbd_reopen_durable_fd(struct ksmbd_work *work,
> +			    struct ksmbd_file *fp);
> +
> +int ksmbd_init_global_file_table(void);
> +void ksmbd_free_global_file_table(void);
> +
> +int ksmbd_file_table_flush(struct ksmbd_work *work);
> +
> +void ksmbd_set_fd_limit(unsigned long limit);
> +
> +/*
> + * INODE hash
> + */
> +
> +int __init ksmbd_inode_hash_init(void);
> +void __exit ksmbd_release_inode_hash(void);
> +
> +enum KSMBD_INODE_STATUS {
> +	KSMBD_INODE_STATUS_OK,
> +	KSMBD_INODE_STATUS_UNKNOWN,
> +	KSMBD_INODE_STATUS_PENDING_DELETE,
> +};
> +
> +int ksmbd_query_inode_status(struct inode *inode);
> +
> +bool ksmbd_inode_pending_delete(struct ksmbd_file *fp);
> +void ksmbd_set_inode_pending_delete(struct ksmbd_file *fp);
> +void ksmbd_clear_inode_pending_delete(struct ksmbd_file *fp);
> +
> +void ksmbd_fd_set_delete_on_close(struct ksmbd_file *fp,
> +				  int file_info);
> +#endif /* __VFS_CACHE_H__ */
> --
> 2.17.1