diff mbox series

[v4,08/10] cifsd: add file operations

Message ID 20210602034847.5371-9-namjae.jeon@samsung.com (mailing list archive)
State New
Headers show
Series cifsd: introduce new SMB3 kernel server | expand

Commit Message

Namjae Jeon June 2, 2021, 3:48 a.m. UTC
This adds file operations and buffer pool.

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 |  265 ++++++
 fs/cifsd/buffer_pool.h |   17 +
 fs/cifsd/vfs.c         | 2015 ++++++++++++++++++++++++++++++++++++++++
 fs/cifsd/vfs.h         |  275 ++++++
 fs/cifsd/vfs_cache.c   |  685 ++++++++++++++
 fs/cifsd/vfs_cache.h   |  185 ++++
 6 files changed, 3442 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

Comments

Christoph Hellwig June 15, 2021, 8:47 a.m. UTC | #1
On Wed, Jun 02, 2021 at 12:48:45PM +0900, Namjae Jeon wrote:
> +#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];

This should use buffer[];

> +};
> +
> +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;
> +};

What does wm stand for?

This looks like arbitrary caching of vmalloc buffers.  I thought we
decided to just make vmalloc suck less rather than papering over that?

> +static LIST_HEAD(wm_lists);
> +static DEFINE_RWLOCK(wm_lists_lock);

Especially as this isn't going to scale at all using global loists and
locks.

> +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);
> +}

These are only ued in vfs_cache.c . So I'd suggest to just move
filp_cache there and drop these wrappers.

> +}
> +
> +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));
> +}

Can you explain this a little more?  When do the normal create/mdir
fail to inherit the owner?

int ksmbd_vfs_inode_permission(struct dentry *dentry, int acc_mode, bool delete)
> +{
> +	int mask, ret = 0;
> +
> +	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;

How about already setting up the MAY_ flags in smb2_create_open_flags
and returning them in extra argument?  That keeps the sm to Linux
translation in a single place.

> +
> +	if (inode_permission(&init_user_ns, d_inode(dentry), mask | MAY_OPEN))
> +		return -EACCES;

And this call can be open coded in the only caller.

> +	if (delete) {

And this block could be split into a nice self-contained helper.

> +		struct dentry *child, *parent;
> +
> +		parent = dget_parent(dentry);
> +		inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
> +		child = lookup_one_len(dentry->d_name.name, parent,
> +				       dentry->d_name.len);
> +		if (IS_ERR(child)) {
> +			ret = PTR_ERR(child);
> +			goto out_lock;
> +		}
> +
> +		if (child != dentry) {
> +			ret = -ESTALE;
> +			dput(child);
> +			goto out_lock;
> +		}
> +		dput(child);

That being said I do not understand the need for this re-lookup at all.

> +	if (!inode_permission(&init_user_ns, d_inode(dentry), MAY_OPEN | MAY_WRITE))

All these inode_permission lines have overly long lines.  It might be
worth to pass the user_namespace to this function, not only to shorten
the code, but also to prepare for user namespace support.

> +	parent = dget_parent(dentry);
> +	inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
> +	child = lookup_one_len(dentry->d_name.name, parent,
> +			       dentry->d_name.len);
> +	if (IS_ERR(child)) {
> +		ret = PTR_ERR(child);
> +		goto out_lock;
> +	}
> +
> +	if (child != dentry) {
> +		ret = -ESTALE;
> +		dput(child);
> +		goto out_lock;
> +	}
> +	dput(child);

This is the same weird re-lookup dance as above.  IFF there is a good
rationale for it it needs to go into a self-contained and well
documented helper.

> +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);

Curious:  why is this using absolute or CWD based path instead of
doing lookups based off the parent as done by e.g. nfsd?  Same also
for mkdir and co.

> +{
> +	struct file *filp;
> +	ssize_t nbytes = 0;
> +	char *rbuf;
> +	struct inode *inode;
> +
> +	rbuf = work->aux_payload_buf;
> +	filp = fp->filp;
> +	inode = file_inode(filp);

These can be initialized on the declaration lines to make the code a
little easier to read.

> +	if (!work->tcon->posix_extensions) {
> +		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);
> +	}

This begs for being split into a self-contained helper.

> +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);
> +}

Please avoid such trivial wrappers that just make the code hard to
follow.

> +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)

What is fqar?

> +
> +/*
> + * 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;

I don't think a CIFS server has any business poking into the block
layer.  What is this trying to do?

> +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
> +}

Please avoid these pointless wrappers and just use large code block
ifdefs or IS_ENABLED checks.

> +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);

vfs_copy_file_range already does this type of fallback, so this is dead
code.

> +#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;
> +};

These looks like on-disk structures.  Any chance you could re-order
the headers so that things like on-disk, on the wire and netlink uapi
structures all have a dedicated and well documented header for
themselves?

> +	read_lock(&ci->m_lock);
> +	list_for_each(cur, &ci->m_fp_list) {
> +		lfp = list_entry(cur, struct ksmbd_file, node);

Please use list_for_each_entry.  There are very few places left where
using list_for_each makes sense.

> +		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);

So a successful find increments m_count, but a miss decreases it?
Isn't this going to create an underflow?

> +	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;

Please use goto based unwinding instead of duplicating the resoure
cleanup.

> +static bool tree_conn_fd_check(struct ksmbd_tree_connect *tcon, struct ksmbd_file *fp)

Overly long line.

> +{
> +	return fp->tcon != tcon;
> +}
> +
> +static bool session_fd_check(struct ksmbd_tree_connect *tcon, struct ksmbd_file *fp)

Same.
Namjae Jeon June 16, 2021, 6:48 a.m. UTC | #2
> On Wed, Jun 02, 2021 at 12:48:45PM +0900, Namjae Jeon wrote:
> > +#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];
> 
> This should use buffer[];
Okay.

> 
> > +};
> > +
> > +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;
> > +};
> 
> What does wm stand for?
> 
> This looks like arbitrary caching of vmalloc buffers.  I thought we decided to just make vmalloc suck
> less rather than papering over that?
Today I have checked that vmalloc performance improvement patch for big allocation is merged.
I will remove it on next version.

> 
> > +static LIST_HEAD(wm_lists);
> > +static DEFINE_RWLOCK(wm_lists_lock);
> 
> Especially as this isn't going to scale at all using global loists and locks.
Okay.

> 
> > +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); }
> 
> These are only ued in vfs_cache.c . So I'd suggest to just move filp_cache there and drop these
> wrappers.
Okay.

> 
> > +}
> > +
> > +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)); }
> 
> Can you explain this a little more?  When do the normal create/mdir fail to inherit the owner?
The ownership of new files and directories is normally created with effective uid of the connected user.
There is "inherit owner" parameter(samba also have same one) to inherit the ownership of the parent directory.

> 
> int ksmbd_vfs_inode_permission(struct dentry *dentry, int acc_mode, bool delete)
> > +{
> > +	int mask, ret = 0;
> > +
> > +	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;
> 
> How about already setting up the MAY_ flags in smb2_create_open_flags and returning them in extra
> argument?  That keeps the sm to Linux translation in a single place.
Right. Will update it.

> 
> > +
> > +	if (inode_permission(&init_user_ns, d_inode(dentry), mask | MAY_OPEN))
> > +		return -EACCES;
> 
> And this call can be open coded in the only caller.
Okay.

> 
> > +	if (delete) {
> 
> And this block could be split into a nice self-contained helper.
Okay.

> 
> > +		struct dentry *child, *parent;
> > +
> > +		parent = dget_parent(dentry);
> > +		inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
> > +		child = lookup_one_len(dentry->d_name.name, parent,
> > +				       dentry->d_name.len);
> > +		if (IS_ERR(child)) {
> > +			ret = PTR_ERR(child);
> > +			goto out_lock;
> > +		}
> > +
> > +		if (child != dentry) {
> > +			ret = -ESTALE;
> > +			dput(child);
> > +			goto out_lock;
> > +		}
> > +		dput(child);
> 
> That being said I do not understand the need for this re-lookup at all.
Al commented parent could be not stable, So checked staleness by re-lookup name under parent lock.

> 
> > +	if (!inode_permission(&init_user_ns, d_inode(dentry), MAY_OPEN |
> > +MAY_WRITE))
> 
> All these inode_permission lines have overly long lines.  It might be worth to pass the user_namespace
> to this function, not only to shorten the code, but also to prepare for user namespace support.
Okay, Let me check it.

> 
> > +	parent = dget_parent(dentry);
> > +	inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
> > +	child = lookup_one_len(dentry->d_name.name, parent,
> > +			       dentry->d_name.len);
> > +	if (IS_ERR(child)) {
> > +		ret = PTR_ERR(child);
> > +		goto out_lock;
> > +	}
> > +
> > +	if (child != dentry) {
> > +		ret = -ESTALE;
> > +		dput(child);
> > +		goto out_lock;
> > +	}
> > +	dput(child);
> 
> This is the same weird re-lookup dance as above.  IFF there is a good rationale for it it needs to go
> into a self-contained and well documented helper.
Okay.

> 
> > +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);
> 
> Curious:  why is this using absolute or CWD based path instead of doing lookups based off the parent
> as done by e.g. nfsd?  Same also for mkdir and co.
Because SMB create request is given an absolute path unlike NFS.

> 
> > +{
> > +	struct file *filp;
> > +	ssize_t nbytes = 0;
> > +	char *rbuf;
> > +	struct inode *inode;
> > +
> > +	rbuf = work->aux_payload_buf;
> > +	filp = fp->filp;
> > +	inode = file_inode(filp);
> 
> These can be initialized on the declaration lines to make the code a little easier to read.
Okay.

> 
> > +	if (!work->tcon->posix_extensions) {
> > +		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);
> > +	}
> 
> This begs for being split into a self-contained helper.
Okay.

> 
> > +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); }
> 
> Please avoid such trivial wrappers that just make the code hard to follow.
Okay.

> 
> > +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)
> 
> What is fqar?
It is an abbreviation for FSCTL QUERY ALLOCATED RANGES.

> 
> > +
> > +/*
> > + * 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;
> 
> I don't think a CIFS server has any business poking into the block layer.  What is this trying to do?
Ah, Yes, We don't need do that. I will change it with statfs->f_bsize.

> 
> > +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
> > +}
> 
> Please avoid these pointless wrappers and just use large code block ifdefs or IS_ENABLED checks.
Okay.

> 
> > +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);
> 
> vfs_copy_file_range already does this type of fallback, so this is dead code.
Okay.

> 
> > +#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;
> > +};
> 
> These looks like on-disk structures.  Any chance you could re-order the headers so that things like
> on-disk, on the wire and netlink uapi structures all have a dedicated and well documented header for
> themselves?
Okay.

> 
> > +	read_lock(&ci->m_lock);
> > +	list_for_each(cur, &ci->m_fp_list) {
> > +		lfp = list_entry(cur, struct ksmbd_file, node);
> 
> Please use list_for_each_entry.  There are very few places left where using list_for_each makes sense.
Okay.

> 
> > +		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);
> 
> So a successful find increments m_count, but a miss decreases it?
> Isn't this going to create an underflow?
m_count is increased from ksmbd_inode_lookup_by_vfsinode().
So m_count should be decreased regardless of finding it.

> 
> > +	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;
> 
> Please use goto based unwinding instead of duplicating the resoure cleanup.
Okay.
> 
> > +static bool tree_conn_fd_check(struct ksmbd_tree_connect *tcon,
> > +struct ksmbd_file *fp)
> 
> Overly long line.
Recently, checkpatch.pl has been changed to allow up to 100 character.
You mean cut it to 80 character if possible?
> 
> > +{
> > +	return fp->tcon != tcon;
> > +}
> > +
> > +static bool session_fd_check(struct ksmbd_tree_connect *tcon, struct
> > +ksmbd_file *fp)
> 
> Same.
Okay.
diff mbox series

Patch

diff --git a/fs/cifsd/buffer_pool.c b/fs/cifsd/buffer_pool.c
new file mode 100644
index 000000000000..ea7d2d1a056a
--- /dev/null
+++ b/fs/cifsd/buffer_pool.c
@@ -0,0 +1,265 @@ 
+// 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);
+
+static struct wm *wm_alloc(size_t sz, gfp_t flags)
+{
+	struct wm *wm;
+	size_t alloc_sz = sz + sizeof(struct wm);
+
+	if (sz > SIZE_MAX - sizeof(struct wm))
+		return NULL;
+
+	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 = kmalloc(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);
+			kfree(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);
+	kvfree(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);
+	}
+	kfree(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_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 = kvmalloc(new_sz, GFP_KERNEL | __GFP_ZERO);
+	if (!nptr)
+		return ptr;
+	memcpy(nptr, ptr, sz);
+	kvfree(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..088aa07ba09b
--- /dev/null
+++ b/fs/cifsd/buffer_pool.h
@@ -0,0 +1,17 @@ 
+/* 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_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..9111b485d611
--- /dev/null
+++ b/fs/cifsd/vfs.c
@@ -0,0 +1,2015 @@ 
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *   Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
+ *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/backing-dev.h>
+#include <linux/writeback.h>
+#include <linux/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 "misc.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 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));
+}
+
+int ksmbd_vfs_inode_permission(struct dentry *dentry, int acc_mode, bool delete)
+{
+	int mask, ret = 0;
+
+	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 *child, *parent;
+
+		parent = dget_parent(dentry);
+		inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
+		child = lookup_one_len(dentry->d_name.name, parent,
+				       dentry->d_name.len);
+		if (IS_ERR(child)) {
+			ret = PTR_ERR(child);
+			goto out_lock;
+		}
+
+		if (child != dentry) {
+			ret = -ESTALE;
+			dput(child);
+			goto out_lock;
+		}
+		dput(child);
+
+		if (inode_permission(&init_user_ns, d_inode(parent), MAY_EXEC | MAY_WRITE)) {
+			ret = -EACCES;
+			goto out_lock;
+		}
+out_lock:
+		inode_unlock(d_inode(parent));
+		dput(parent);
+	}
+	return ret;
+}
+
+int ksmbd_vfs_query_maximal_access(struct dentry *dentry, __le32 *daccess)
+{
+	struct dentry *parent, *child;
+	int ret = 0;
+
+	*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);
+	inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
+	child = lookup_one_len(dentry->d_name.name, parent,
+			       dentry->d_name.len);
+	if (IS_ERR(child)) {
+		ret = PTR_ERR(child);
+		goto out_lock;
+	}
+
+	if (child != dentry) {
+		ret = -ESTALE;
+		dput(child);
+		goto out_lock;
+	}
+	dput(child);
+
+	if (!inode_permission(&init_user_ns, d_inode(parent), MAY_EXEC | MAY_WRITE))
+		*daccess |= FILE_DELETE_LE;
+
+out_lock:
+	inode_unlock(d_inode(parent));
+	dput(parent);
+	return ret;
+}
+
+/**
+ * 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));
+	} 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) {
+		goto out;
+	} else if (d_unhashed(dentry)) {
+		struct dentry *d;
+
+		d = lookup_one_len(dentry->d_name.name, dentry->d_parent,
+				   dentry->d_name.len);
+		if (IS_ERR(d)) {
+			err = PTR_ERR(d);
+			goto out;
+		}
+		if (unlikely(d_is_negative(d))) {
+			dput(d);
+			err = -ENOENT;
+			goto out;
+		}
+
+		ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
+		dput(d);
+	}
+out:
+	done_path_create(&path, dentry);
+	if (err)
+		ksmbd_err("mkdir(%s): creation failed (err:%d)\n", name, err);
+	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:
+	kvfree(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;
+
+	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 ((int)v_len <= 0)
+		return (int)v_len;
+
+	if (v_len <= *pos) {
+		count = -EINVAL;
+		goto free_buf;
+	}
+
+	if (v_len - *pos < count)
+		count = v_len - *pos;
+
+	memcpy(buf, &stream_buf[*pos], count);
+
+free_buf:
+	kvfree(stream_buf);
+	return count;
+}
+
+/**
+ * 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;
+	struct inode *inode;
+
+	rbuf = work->aux_payload_buf;
+	filp = fp->filp;
+	inode = file_inode(filp);
+	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);
+
+	if (!work->tcon->posix_extensions) {
+		int ret;
+
+		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) {
+		ksmbd_err("smb read failed for (%s), err = %zd\n",
+			  fp->filename, 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 ((int)v_len < 0) {
+		ksmbd_err("not found stream in xattr : %zd\n", v_len);
+		err = (int)v_len;
+		goto out;
+	}
+
+	if (v_len < size) {
+		wbuf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
+		if (!wbuf) {
+			err = -ENOMEM;
+			goto out;
+		}
+
+		if (v_len > 0)
+			memcpy(wbuf, stream_buf, v_len);
+		kvfree(stream_buf);
+		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:
+	kvfree(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;
+	}
+
+	if (!work->tcon->posix_extensions) {
+		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, u64 fid, u64 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 path;
+	struct dentry *dentry, *parent;
+	int err;
+	int flags = 0;
+
+	if (ksmbd_override_fsids(work))
+		return -ENOMEM;
+
+	if (test_share_config_flag(work->tcon->share_conf,
+				   KSMBD_SHARE_FLAG_FOLLOW_SYMLINKS))
+		flags = LOOKUP_FOLLOW;
+
+	err = kern_path(name, flags, &path);
+	if (err) {
+		ksmbd_debug(VFS, "can't get %s, err %d\n", name, err);
+		ksmbd_revert_fsids(work);
+		return err;
+	}
+
+	parent = dget_parent(path.dentry);
+	inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
+	dentry = lookup_one_len(path.dentry->d_name.name, parent,
+				strlen(path.dentry->d_name.name));
+	if (IS_ERR(dentry)) {
+		err = PTR_ERR(dentry);
+		ksmbd_debug(VFS, "%s: lookup failed, err %d\n",
+			    path.dentry->d_name.name, 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(parent), 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(parent), dentry, NULL);
+		if (err)
+			ksmbd_debug(VFS, "%s: unlink failed, err %d\n", name,
+				    err);
+	}
+
+	dput(dentry);
+out_err:
+	inode_unlock(d_inode(parent));
+	dput(parent);
+	path_put(&path);
+	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;
+	int flags = 0;
+
+	if (ksmbd_override_fsids(work))
+		return -ENOMEM;
+
+	if (test_share_config_flag(work->tcon->share_conf,
+				   KSMBD_SHARE_FLAG_FOLLOW_SYMLINKS))
+		flags = LOOKUP_FOLLOW;
+
+	err = kern_path(oldname, flags, &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,
+				  flags | 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;
+
+	if (!work->tcon->posix_extensions) {
+		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, *src_child;
+	char *dst_name;
+	int err;
+	int flags;
+
+	dst_name = extract_last_component(newname);
+	if (!dst_name)
+		return -EINVAL;
+
+	src_dent_parent = dget_parent(fp->filp->f_path.dentry);
+	src_dent = fp->filp->f_path.dentry;
+
+	flags = LOOKUP_DIRECTORY;
+	if (test_share_config_flag(work->tcon->share_conf,
+				   KSMBD_SHARE_FLAG_FOLLOW_SYMLINKS))
+		flags |= LOOKUP_FOLLOW;
+
+	err = kern_path(newname, flags, &dst_path);
+	if (err) {
+		ksmbd_debug(VFS, "Cannot get path for %s [%d]\n", newname, err);
+		goto out;
+	}
+	dst_dent_parent = dst_path.dentry;
+
+	trap_dent = lock_rename(src_dent_parent, dst_dent_parent);
+	dget(src_dent);
+	dget(dst_dent_parent);
+	src_child = lookup_one_len(src_dent->d_name.name, src_dent_parent,
+				   src_dent->d_name.len);
+	if (IS_ERR(src_child)) {
+		err = PTR_ERR(src_child);
+		goto out_lock;
+	}
+
+	if (src_child != src_dent) {
+		err = -ESTALE;
+		dput(src_child);
+		goto out_lock;
+	}
+	dput(src_child);
+
+	err = __ksmbd_vfs_rename(work,
+				 src_dent_parent,
+				 src_dent,
+				 dst_dent_parent,
+				 trap_dent,
+				 dst_name);
+out_lock:
+	dput(src_dent);
+	dput(dst_dent_parent);
+	unlock_rename(src_dent_parent, dst_dent_parent);
+	path_put(&dst_path);
+out:
+	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;
+
+	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);
+
+		if (!work->tcon->posix_extensions) {
+			struct inode *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 = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
+	if (!vlist)
+		return -ENOMEM;
+
+	*list = vlist;
+	size = vfs_listxattr(dentry, vlist, size);
+	if (size < 0) {
+		ksmbd_debug(VFS, "listxattr failed\n");
+		kvfree(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);
+}
+
+int ksmbd_vfs_unlink(struct dentry *dir, struct dentry *dentry)
+{
+	struct dentry *child;
+	int err = 0;
+
+	inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
+	dget(dentry);
+	child = lookup_one_len(dentry->d_name.name, dir, dentry->d_name.len);
+	if (IS_ERR(child)) {
+		err = PTR_ERR(child);
+		goto out;
+	}
+
+	if (child != dentry) {
+		err = -ESTALE;
+		dput(child);
+		goto out;
+	}
+	dput(child);
+
+	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:
+	dput(dentry);
+	inode_unlock(d_inode(dir));
+	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
+ * @dir:	path info
+ * @name:	filename to lookup
+ * @namelen:	filename length
+ *
+ * Return:	0 on success, otherwise error
+ */
+static int ksmbd_vfs_lookup_in_dir(struct path *dir, char *name, size_t namelen)
+{
+	int ret;
+	struct file *dfilp;
+	int flags = O_RDONLY | O_LARGEFILE;
+	struct ksmbd_readdir_data readdir_data = {
+		.ctx.actor	= __caseless_lookup,
+		.private	= name,
+		.used		= namelen,
+		.dirent_count	= 0,
+	};
+
+	dfilp = dentry_open(dir, flags, current_cred());
+	if (IS_ERR(dfilp))
+		return PTR_ERR(dfilp);
+
+	ret = ksmbd_vfs_readdir(dfilp, &readdir_data);
+	if (readdir_data.dirent_count > 0)
+		ret = 0;
+	fput(dfilp);
+	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)
+{
+	int err;
+
+	if (name[0] != '/')
+		return -EINVAL;
+
+	err = kern_path(name, flags, path);
+	if (!err)
+		return 0;
+
+	if (caseless) {
+		char *filepath;
+		struct path parent;
+		size_t path_len, remain_len;
+
+		filepath = kstrdup(name, GFP_KERNEL);
+		if (!filepath)
+			return -ENOMEM;
+
+		path_len = strlen(filepath);
+		remain_len = path_len - 1;
+
+		err = kern_path("/", flags, &parent);
+		if (err)
+			goto out;
+
+		while (d_can_lookup(parent.dentry)) {
+			char *filename = filepath + path_len - remain_len;
+			char *next = strchrnul(filename, '/');
+			size_t filename_len = next - filename;
+			bool is_last = !next[0];
+
+			if (filename_len == 0)
+				break;
+
+			err = ksmbd_vfs_lookup_in_dir(&parent, filename,
+						      filename_len);
+			if (err) {
+				path_put(&parent);
+				goto out;
+			}
+
+			path_put(&parent);
+			next[0] = '\0';
+
+			err = kern_path(filepath, flags, &parent);
+			if (err)
+				goto out;
+
+			if (is_last) {
+				path->mnt = parent.mnt;
+				path->dentry = parent.dentry;
+				goto out;
+			}
+
+			next[0] = '/';
+			remain_len -= filename_len + 1;
+		}
+
+		path_put(&parent);
+		err = -EINVAL;
+out:
+		kfree(filepath);
+	}
+	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:
+	kvfree(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:
+	kvfree(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 = d_inode(dentry);
+
+	acl.version = 4;
+	acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
+	acl.current_time = ksmbd_UnixTimeToNT(current_time(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(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,
+			       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 = d_inode(dentry);
+		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;
+		kfree(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:
+	kvfree(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;
+}
+
+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);
+
+	if (!work->tcon->posix_extensions) {
+		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..5db1e9e2a754
--- /dev/null
+++ b/fs/cifsd/vfs.h
@@ -0,0 +1,275 @@ 
+/* 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, u64 fid, u64 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_fp_rename(struct ksmbd_work *work, struct ksmbd_file *fp,
+			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);
+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);
+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_xattr_stream_name(char *stream_name, char **xattr_stream_name,
+				size_t *xattr_stream_name_size, int s_type);
+int ksmbd_vfs_remove_xattr(struct dentry *dentry, char *attr_name);
+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..6ea09fe82814
--- /dev/null
+++ b/fs/cifsd/vfs_cache.c
@@ -0,0 +1,685 @@ 
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
+ * 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 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)
+{
+	struct ksmbd_file *fp;
+
+	read_lock(&ft->lock);
+	fp = idr_find(ft->idr, id);
+	if (fp)
+		fp = ksmbd_fp_get(fp);
+	read_unlock(&ft->lock);
+	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);
+}
+
+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_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 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)
+{
+	return false;
+}
+
+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_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 = kzalloc(sizeof(struct idr), GFP_KERNEL);
+	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);
+	kfree(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..635eedbd497c
--- /dev/null
+++ b/fs/cifsd/vfs_cache.h
@@ -0,0 +1,185 @@ 
+/* 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/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)		d_inode((fp)->filp->f_path.dentry)
+#define PARENT_INODE(fp)	d_inode((fp)->filp->f_path.dentry->d_parent)
+
+#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_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);
+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_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_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 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__ */