cifsd: add file operations

This adds file operations and buffer pool for cifsd.
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifsd/buffer_pool.c

+// 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;
+}

fs/cifsd/buffer_pool.h

+/* 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__ */

fs/cifsd/vfs.h

+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *   Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
+ *   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__ */

fs/cifsd/vfs_cache.h

+/* 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__ */