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Date: Tue, 23 Mar 2021 09:21:22 +0900
From: "Namjae Jeon" <namjae.jeon@...sung.com>
To: "'Schaufler, Casey'" <casey.schaufler@...el.com>
Cc: <linux-cifsd-devel@...ts.sourceforge.net>, <smfrench@...il.com>,
<senozhatsky@...omium.org>, <hyc.lee@...il.com>,
<viro@...iv.linux.org.uk>, <hch@....de>, <hch@...radead.org>,
<ronniesahlberg@...il.com>, <aurelien.aptel@...il.com>,
<aaptel@...e.com>, <sandeen@...deen.net>,
<dan.carpenter@...cle.com>, <colin.king@...onical.com>,
<rdunlap@...radead.org>,
"'Sergey Senozhatsky'" <sergey.senozhatsky@...il.com>,
"'Steve French'" <stfrench@...rosoft.com>,
<casey@...aufler-ca.com>, <linux-fsdevel@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-cifs@...r.kernel.org>
Subject: RE: [PATCH 3/5] cifsd: add file operations
>
> > -----Original Message-----
> > From: Namjae Jeon <namjae.jeon@...sung.com>
> > Sent: Sunday, March 21, 2021 10:14 PM
> > To: linux-fsdevel@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> > cifs@...r.kernel.org
> > Cc: linux-cifsd-devel@...ts.sourceforge.net; smfrench@...il.com;
> > senozhatsky@...omium.org; hyc.lee@...il.com; viro@...iv.linux.org.uk;
> > hch@....de; hch@...radead.org; ronniesahlberg@...il.com;
> > aurelien.aptel@...il.com; aaptel@...e.com; sandeen@...deen.net;
> > dan.carpenter@...cle.com; colin.king@...onical.com;
> > rdunlap@...radead.org; Namjae Jeon <namjae.jeon@...sung.com>;
> > Sergey Senozhatsky <sergey.senozhatsky@...il.com>; Steve French
> > <stfrench@...rosoft.com>
> > Subject: [PATCH 3/5] cifsd: add file operations
> >
> > This adds file operations and buffer pool for cifsd.
> >
> > Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
> > Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> > Signed-off-by: Hyunchul Lee <hyc.lee@...il.com>
> > Acked-by: Ronnie Sahlberg <lsahlber@...hat.com>
> > Signed-off-by: Steve French <stfrench@...rosoft.com>
> > ---
> > fs/cifsd/buffer_pool.c | 292 ++++++
> > fs/cifsd/buffer_pool.h | 28 +
> > fs/cifsd/vfs.c | 1989 ++++++++++++++++++++++++++++++++++++++++
> > fs/cifsd/vfs.h | 314 +++++++
> > fs/cifsd/vfs_cache.c | 851 +++++++++++++++++
> > fs/cifsd/vfs_cache.h | 213 +++++
> > 6 files changed, 3687 insertions(+)
> > create mode 100644 fs/cifsd/buffer_pool.c
> > create mode 100644 fs/cifsd/buffer_pool.h
> > create mode 100644 fs/cifsd/vfs.c
> > create mode 100644 fs/cifsd/vfs.h
> > create mode 100644 fs/cifsd/vfs_cache.c
> > create mode 100644 fs/cifsd/vfs_cache.h
> >
> > diff --git a/fs/cifsd/buffer_pool.c b/fs/cifsd/buffer_pool.c
> > new file mode 100644
> > index 000000000000..864fea547c68
> > --- /dev/null
> > +++ b/fs/cifsd/buffer_pool.c
> > @@ -0,0 +1,292 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + * Copyright (C) 2018 Samsung Electronics Co., Ltd.
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/wait.h>
> > +#include <linux/sched.h>
> > +#include <linux/mm.h>
> > +#include <linux/slab.h>
> > +#include <linux/vmalloc.h>
> > +#include <linux/rwlock.h>
> > +
> > +#include "glob.h"
> > +#include "buffer_pool.h"
> > +#include "connection.h"
> > +#include "mgmt/ksmbd_ida.h"
> > +
> > +static struct kmem_cache *filp_cache;
> > +
> > +struct wm {
> > + struct list_head list;
> > + unsigned int sz;
> > + char buffer[0];
> > +};
> > +
> > +struct wm_list {
> > + struct list_head list;
> > + unsigned int sz;
> > +
> > + spinlock_t wm_lock;
> > + int avail_wm;
> > + struct list_head idle_wm;
> > + wait_queue_head_t wm_wait;
> > +};
> > +
> > +static LIST_HEAD(wm_lists);
> > +static DEFINE_RWLOCK(wm_lists_lock);
> > +
> > +void *ksmbd_alloc(size_t size)
> > +{
> > + return kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
> > +}
> > +
> > +void ksmbd_free(void *ptr)
> > +{
> > + kvfree(ptr);
> > +}
> > +
> > +static struct wm *wm_alloc(size_t sz, gfp_t flags)
> > +{
> > + struct wm *wm;
> > + size_t alloc_sz = sz + sizeof(struct wm);
> > +
> > + wm = kvmalloc(alloc_sz, flags);
> > + if (!wm)
> > + return NULL;
> > + wm->sz = sz;
> > + return wm;
> > +}
> > +
> > +static int register_wm_size_class(size_t sz)
> > +{
> > + struct wm_list *l, *nl;
> > +
> > + nl = kvmalloc(sizeof(struct wm_list), GFP_KERNEL);
> > + if (!nl)
> > + return -ENOMEM;
> > +
> > + nl->sz = sz;
> > + spin_lock_init(&nl->wm_lock);
> > + INIT_LIST_HEAD(&nl->idle_wm);
> > + INIT_LIST_HEAD(&nl->list);
> > + init_waitqueue_head(&nl->wm_wait);
> > + nl->avail_wm = 0;
> > +
> > + write_lock(&wm_lists_lock);
> > + list_for_each_entry(l, &wm_lists, list) {
> > + if (l->sz == sz) {
> > + write_unlock(&wm_lists_lock);
> > + kvfree(nl);
> > + return 0;
> > + }
> > + }
> > +
> > + list_add(&nl->list, &wm_lists);
> > + write_unlock(&wm_lists_lock);
> > + return 0;
> > +}
> > +
> > +static struct wm_list *match_wm_list(size_t size)
> > +{
> > + struct wm_list *l, *rl = NULL;
> > +
> > + read_lock(&wm_lists_lock);
> > + list_for_each_entry(l, &wm_lists, list) {
> > + if (l->sz == size) {
> > + rl = l;
> > + break;
> > + }
> > + }
> > + read_unlock(&wm_lists_lock);
> > + return rl;
> > +}
> > +
> > +static struct wm *find_wm(size_t size)
> > +{
> > + struct wm_list *wm_list;
> > + struct wm *wm;
> > +
> > + wm_list = match_wm_list(size);
> > + if (!wm_list) {
> > + if (register_wm_size_class(size))
> > + return NULL;
> > + wm_list = match_wm_list(size);
> > + }
> > +
> > + if (!wm_list)
> > + return NULL;
> > +
> > + while (1) {
> > + spin_lock(&wm_list->wm_lock);
> > + if (!list_empty(&wm_list->idle_wm)) {
> > + wm = list_entry(wm_list->idle_wm.next,
> > + struct wm,
> > + list);
> > + list_del(&wm->list);
> > + spin_unlock(&wm_list->wm_lock);
> > + return wm;
> > + }
> > +
> > + if (wm_list->avail_wm > num_online_cpus()) {
> > + spin_unlock(&wm_list->wm_lock);
> > + wait_event(wm_list->wm_wait,
> > + !list_empty(&wm_list->idle_wm));
> > + continue;
> > + }
> > +
> > + wm_list->avail_wm++;
> > + spin_unlock(&wm_list->wm_lock);
> > +
> > + wm = wm_alloc(size, GFP_KERNEL);
> > + if (!wm) {
> > + spin_lock(&wm_list->wm_lock);
> > + wm_list->avail_wm--;
> > + spin_unlock(&wm_list->wm_lock);
> > + wait_event(wm_list->wm_wait,
> > + !list_empty(&wm_list->idle_wm));
> > + continue;
> > + }
> > + break;
> > + }
> > +
> > + return wm;
> > +}
> > +
> > +static void release_wm(struct wm *wm, struct wm_list *wm_list)
> > +{
> > + if (!wm)
> > + return;
> > +
> > + spin_lock(&wm_list->wm_lock);
> > + if (wm_list->avail_wm <= num_online_cpus()) {
> > + list_add(&wm->list, &wm_list->idle_wm);
> > + spin_unlock(&wm_list->wm_lock);
> > + wake_up(&wm_list->wm_wait);
> > + return;
> > + }
> > +
> > + wm_list->avail_wm--;
> > + spin_unlock(&wm_list->wm_lock);
> > + ksmbd_free(wm);
> > +}
> > +
> > +static void wm_list_free(struct wm_list *l)
> > +{
> > + struct wm *wm;
> > +
> > + while (!list_empty(&l->idle_wm)) {
> > + wm = list_entry(l->idle_wm.next, struct wm, list);
> > + list_del(&wm->list);
> > + kvfree(wm);
> > + }
> > + kvfree(l);
> > +}
> > +
> > +static void wm_lists_destroy(void)
> > +{
> > + struct wm_list *l;
> > +
> > + while (!list_empty(&wm_lists)) {
> > + l = list_entry(wm_lists.next, struct wm_list, list);
> > + list_del(&l->list);
> > + wm_list_free(l);
> > + }
> > +}
> > +
> > +void ksmbd_free_request(void *addr)
> > +{
> > + kvfree(addr);
> > +}
> > +
> > +void *ksmbd_alloc_request(size_t size)
> > +{
> > + return kvmalloc(size, GFP_KERNEL);
> > +}
> > +
> > +void ksmbd_free_response(void *buffer)
> > +{
> > + kvfree(buffer);
> > +}
> > +
> > +void *ksmbd_alloc_response(size_t size)
> > +{
> > + return kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
> > +}
> > +
> > +void *ksmbd_find_buffer(size_t size)
> > +{
> > + struct wm *wm;
> > +
> > + wm = find_wm(size);
> > +
> > + WARN_ON(!wm);
> > + if (wm)
> > + return wm->buffer;
> > + return NULL;
> > +}
> > +
> > +void ksmbd_release_buffer(void *buffer)
> > +{
> > + struct wm_list *wm_list;
> > + struct wm *wm;
> > +
> > + if (!buffer)
> > + return;
> > +
> > + wm = container_of(buffer, struct wm, buffer);
> > + wm_list = match_wm_list(wm->sz);
> > + WARN_ON(!wm_list);
> > + if (wm_list)
> > + release_wm(wm, wm_list);
> > +}
> > +
> > +void *ksmbd_realloc_response(void *ptr, size_t old_sz, size_t new_sz)
> > +{
> > + size_t sz = min(old_sz, new_sz);
> > + void *nptr;
> > +
> > + nptr = ksmbd_alloc_response(new_sz);
> > + if (!nptr)
> > + return ptr;
> > + memcpy(nptr, ptr, sz);
> > + ksmbd_free_response(ptr);
> > + return nptr;
> > +}
> > +
> > +void ksmbd_free_file_struct(void *filp)
> > +{
> > + kmem_cache_free(filp_cache, filp);
> > +}
> > +
> > +void *ksmbd_alloc_file_struct(void)
> > +{
> > + return kmem_cache_zalloc(filp_cache, GFP_KERNEL);
> > +}
> > +
> > +void ksmbd_destroy_buffer_pools(void)
> > +{
> > + wm_lists_destroy();
> > + ksmbd_work_pool_destroy();
> > + kmem_cache_destroy(filp_cache);
> > +}
> > +
> > +int ksmbd_init_buffer_pools(void)
> > +{
> > + if (ksmbd_work_pool_init())
> > + goto out;
> > +
> > + filp_cache = kmem_cache_create("ksmbd_file_cache",
> > + sizeof(struct ksmbd_file), 0,
> > + SLAB_HWCACHE_ALIGN, NULL);
> > + if (!filp_cache)
> > + goto out;
> > +
> > + return 0;
> > +
> > +out:
> > + ksmbd_err("failed to allocate memory\n");
> > + ksmbd_destroy_buffer_pools();
> > + return -ENOMEM;
> > +}
> > diff --git a/fs/cifsd/buffer_pool.h b/fs/cifsd/buffer_pool.h
> > new file mode 100644
> > index 000000000000..2b3d03afcf27
> > --- /dev/null
> > +++ b/fs/cifsd/buffer_pool.h
> > @@ -0,0 +1,28 @@
> > +/* SPDX-License-Identifier: GPL-2.0-or-later */
> > +/*
> > + * Copyright (C) 2018 Samsung Electronics Co., Ltd.
> > + */
> > +
> > +#ifndef __KSMBD_BUFFER_POOL_H__
> > +#define __KSMBD_BUFFER_POOL_H__
> > +
> > +void *ksmbd_find_buffer(size_t size);
> > +void ksmbd_release_buffer(void *buffer);
> > +
> > +void *ksmbd_alloc(size_t size);
> > +void ksmbd_free(void *ptr);
> > +
> > +void ksmbd_free_request(void *addr);
> > +void *ksmbd_alloc_request(size_t size);
> > +void ksmbd_free_response(void *buffer);
> > +void *ksmbd_alloc_response(size_t size);
> > +
> > +void *ksmbd_realloc_response(void *ptr, size_t old_sz, size_t new_sz);
> > +
> > +void ksmbd_free_file_struct(void *filp);
> > +void *ksmbd_alloc_file_struct(void);
> > +
> > +void ksmbd_destroy_buffer_pools(void);
> > +int ksmbd_init_buffer_pools(void);
> > +
> > +#endif /* __KSMBD_BUFFER_POOL_H__ */
> > diff --git a/fs/cifsd/vfs.c b/fs/cifsd/vfs.c
> > new file mode 100644
> > index 000000000000..00f80ca45690
> > --- /dev/null
> > +++ b/fs/cifsd/vfs.c
> > @@ -0,0 +1,1989 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + * Copyright (C) 2016 Namjae Jeon <linkinjeon@...nel.org>
> > + * Copyright (C) 2018 Samsung Electronics Co., Ltd.
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/fs.h>
> > +#include <linux/uaccess.h>
> > +#include <linux/backing-dev.h>
> > +#include <linux/writeback.h>
> > +#include <linux/version.h>
> > +#include <linux/xattr.h>
> > +#include <linux/falloc.h>
> > +#include <linux/genhd.h>
> > +#include <linux/blkdev.h>
> > +#include <linux/fsnotify.h>
> > +#include <linux/dcache.h>
> > +#include <linux/slab.h>
> > +#include <linux/vmalloc.h>
> > +#include <linux/sched/xacct.h>
> > +#include <linux/crc32c.h>
> > +
> > +#include "glob.h"
> > +#include "oplock.h"
> > +#include "connection.h"
> > +#include "buffer_pool.h"
> > +#include "vfs.h"
> > +#include "vfs_cache.h"
> > +#include "smbacl.h"
> > +#include "ndr.h"
> > +#include "auth.h"
> > +
> > +#include "time_wrappers.h"
> > +#include "smb_common.h"
> > +#include "mgmt/share_config.h"
> > +#include "mgmt/tree_connect.h"
> > +#include "mgmt/user_session.h"
> > +#include "mgmt/user_config.h"
> > +
> > +static char *extract_last_component(char *path)
> > +{
> > + char *p = strrchr(path, '/');
> > +
> > + if (p && p[1] != '\0') {
> > + *p = '\0';
> > + p++;
> > + } else {
> > + p = NULL;
> > + ksmbd_err("Invalid path %s\n", path);
> > + }
> > + return p;
> > +}
> > +
> > +static void rollback_path_modification(char *filename)
> > +{
> > + if (filename) {
> > + filename--;
> > + *filename = '/';
> > + }
> > +}
> > +
> > +static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work,
> > + struct inode *parent_inode,
> > + struct inode *inode)
> > +{
> > + if (!test_share_config_flag(work->tcon->share_conf,
> > + KSMBD_SHARE_FLAG_INHERIT_OWNER))
> > + return;
> > +
> > + i_uid_write(inode, i_uid_read(parent_inode));
> > +}
> > +
> > +static void ksmbd_vfs_inherit_smack(struct ksmbd_work *work,
> > + struct dentry *dir_dentry,
> > + struct dentry *dentry)
> > +{
> > + char *name, *xattr_list = NULL, *smack_buf;
> > + int value_len, xattr_list_len;
> > +
> > + if (!test_share_config_flag(work->tcon->share_conf,
> > + KSMBD_SHARE_FLAG_INHERIT_SMACK))
> > + return;
> > +
> > + xattr_list_len = ksmbd_vfs_listxattr(dir_dentry, &xattr_list);
> > + if (xattr_list_len < 0) {
> > + goto out;
> > + } else if (!xattr_list_len) {
> > + ksmbd_err("no ea data in the file\n");
> > + return;
> > + }
> > +
> > + for (name = xattr_list; name - xattr_list < xattr_list_len;
> > + name += strlen(name) + 1) {
> > + int rc;
> > +
> > + ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
> > + if (strcmp(name, XATTR_NAME_SMACK))
>
> Smack uses multiple xattrs. In addition to XATTR_NAME_SMACK you need
> XATTR_NAME_SMACKEXEC, XATTR_NAME_SMACKTRANSMUTE and
> XATTR_NAME_SMACKMMAP.
>
> Why is Smack treated specially?
We are using smack in our product and there was a requirement to inherit.
But I don't think it's necessary anymore.
>
> > + continue;
> > +
> > + value_len = ksmbd_vfs_getxattr(dir_dentry, name,
> > &smack_buf);
> > + if (value_len <= 0)
> > + continue;
> > +
> > + rc = ksmbd_vfs_setxattr(dentry, XATTR_NAME_SMACK,
> > smack_buf,
> > + value_len, 0);
> > + ksmbd_free(smack_buf);
> > + if (rc < 0)
> > + ksmbd_err("ksmbd_vfs_setxattr() failed: %d\n", rc);
> > + }
> > +out:
> > + ksmbd_vfs_xattr_free(xattr_list);
> > +}
> > +
> > +int ksmbd_vfs_inode_permission(struct dentry *dentry, int acc_mode,
> > bool delete)
> > +{
> > + int mask;
> > +
> > + mask = 0;
> > + acc_mode &= O_ACCMODE;
> > +
> > + if (acc_mode == O_RDONLY)
> > + mask = MAY_READ;
> > + else if (acc_mode == O_WRONLY)
> > + mask = MAY_WRITE;
> > + else if (acc_mode == O_RDWR)
> > + mask = MAY_READ | MAY_WRITE;
> > +
> > + if (inode_permission(&init_user_ns, d_inode(dentry), mask |
> > MAY_OPEN))
> > + return -EACCES;
> > +
> > + if (delete) {
> > + struct dentry *parent;
> > +
> > + parent = dget_parent(dentry);
> > + if (!parent)
> > + return -EINVAL;
> > +
> > + if (inode_permission(&init_user_ns, d_inode(parent),
> > MAY_EXEC | MAY_WRITE)) {
> > + dput(parent);
> > + return -EACCES;
> > + }
> > + dput(parent);
> > + }
> > + return 0;
> > +}
> > +
> > +int ksmbd_vfs_query_maximal_access(struct dentry *dentry, __le32
> > *daccess)
> > +{
> > + struct dentry *parent;
> > +
> > + *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
> > +
> > + if (!inode_permission(&init_user_ns, d_inode(dentry), MAY_OPEN |
> > MAY_WRITE))
> > + *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER |
> > SYNCHRONIZE |
> > + FILE_WRITE_DATA | FILE_APPEND_DATA |
> > + FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
> > + FILE_DELETE_CHILD);
> > +
> > + if (!inode_permission(&init_user_ns, d_inode(dentry), MAY_OPEN |
> > MAY_READ))
> > + *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
> > +
> > + if (!inode_permission(&init_user_ns, d_inode(dentry), MAY_OPEN |
> > MAY_EXEC))
> > + *daccess |= FILE_EXECUTE_LE;
> > +
> > + parent = dget_parent(dentry);
> > + if (!parent)
> > + return 0;
> > +
> > + if (!inode_permission(&init_user_ns, d_inode(parent), MAY_EXEC |
> > MAY_WRITE))
> > + *daccess |= FILE_DELETE_LE;
> > + dput(parent);
> > + return 0;
> > +}
> > +
> > +
> > +/**
> > + * ksmbd_vfs_create() - vfs helper for smb create file
> > + * @work: work
> > + * @name: file name
> > + * @mode: file create mode
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +int ksmbd_vfs_create(struct ksmbd_work *work,
> > + const char *name,
> > + umode_t mode)
> > +{
> > + struct path path;
> > + struct dentry *dentry;
> > + int err;
> > +
> > + dentry = kern_path_create(AT_FDCWD, name, &path, 0);
> > + if (IS_ERR(dentry)) {
> > + err = PTR_ERR(dentry);
> > + if (err != -ENOENT)
> > + ksmbd_err("path create failed for %s, err %d\n",
> > + name, err);
> > + return err;
> > + }
> > +
> > + mode |= S_IFREG;
> > + err = vfs_create(&init_user_ns, d_inode(path.dentry), dentry,
> > mode, true);
> > + if (!err) {
> > + ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
> > + d_inode(dentry));
> > + ksmbd_vfs_inherit_smack(work, path.dentry, dentry);
> > + } else {
> > + ksmbd_err("File(%s): creation failed (err:%d)\n", name, err);
> > + }
> > + done_path_create(&path, dentry);
> > + return err;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_mkdir() - vfs helper for smb create directory
> > + * @work: work
> > + * @name: directory name
> > + * @mode: directory create mode
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +int ksmbd_vfs_mkdir(struct ksmbd_work *work,
> > + const char *name,
> > + umode_t mode)
> > +{
> > + struct path path;
> > + struct dentry *dentry;
> > + int err;
> > +
> > + dentry = kern_path_create(AT_FDCWD, name, &path,
> > LOOKUP_DIRECTORY);
> > + if (IS_ERR(dentry)) {
> > + err = PTR_ERR(dentry);
> > + if (err != -EEXIST)
> > + ksmbd_debug(VFS, "path create failed for %s, err
> > %d\n",
> > + name, err);
> > + return err;
> > + }
> > +
> > + mode |= S_IFDIR;
> > + err = vfs_mkdir(&init_user_ns, d_inode(path.dentry), dentry,
> > mode);
> > + if (!err) {
> > + ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
> > + d_inode(dentry));
> > + ksmbd_vfs_inherit_smack(work, path.dentry, dentry);
> > + } else
> > + ksmbd_err("mkdir(%s): creation failed (err:%d)\n", name,
> > err);
> > +
> > + done_path_create(&path, dentry);
> > + return err;
> > +}
> > +
> > +static ssize_t ksmbd_vfs_getcasexattr(struct dentry *dentry,
> > + char *attr_name,
> > + int attr_name_len,
> > + char **attr_value)
> > +{
> > + char *name, *xattr_list = NULL;
> > + ssize_t value_len = -ENOENT, xattr_list_len;
> > +
> > + xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
> > + if (xattr_list_len <= 0)
> > + goto out;
> > +
> > + for (name = xattr_list; name - xattr_list < xattr_list_len;
> > + name += strlen(name) + 1) {
> > + ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
> > + if (strncasecmp(attr_name, name, attr_name_len))
> > + continue;
> > +
> > + value_len = ksmbd_vfs_getxattr(dentry,
> > + name,
> > + attr_value);
> > + if (value_len < 0)
> > + ksmbd_err("failed to get xattr in file\n");
> > + break;
> > + }
> > +
> > +out:
> > + ksmbd_vfs_xattr_free(xattr_list);
> > + return value_len;
> > +}
> > +
> > +static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t
> > *pos,
> > + size_t count)
> > +{
> > + ssize_t v_len;
> > + char *stream_buf = NULL;
> > + int err;
> > +
> > + ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
> > + *pos, count);
> > +
> > + v_len = ksmbd_vfs_getcasexattr(fp->filp->f_path.dentry,
> > + fp->stream.name,
> > + fp->stream.size,
> > + &stream_buf);
> > + if (v_len == -ENOENT) {
> > + ksmbd_err("not found stream in xattr : %zd\n", v_len);
> > + err = -ENOENT;
> > + return err;
> > + }
> > +
> > + memcpy(buf, &stream_buf[*pos], count);
> > + return v_len > count ? count : v_len;
> > +}
> > +
> > +/**
> > + * check_lock_range() - vfs helper for smb byte range file locking
> > + * @filp: the file to apply the lock to
> > + * @start: lock start byte offset
> > + * @end: lock end byte offset
> > + * @type: byte range type read/write
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +static int check_lock_range(struct file *filp,
> > + loff_t start,
> > + loff_t end,
> > + unsigned char type)
> > +{
> > + struct file_lock *flock;
> > + struct file_lock_context *ctx = file_inode(filp)->i_flctx;
> > + int error = 0;
> > +
> > + if (!ctx || list_empty_careful(&ctx->flc_posix))
> > + return 0;
> > +
> > + spin_lock(&ctx->flc_lock);
> > + list_for_each_entry(flock, &ctx->flc_posix, fl_list) {
> > + /* check conflict locks */
> > + if (flock->fl_end >= start && end >= flock->fl_start) {
> > + if (flock->fl_type == F_RDLCK) {
> > + if (type == WRITE) {
> > + ksmbd_err("not allow write by
> > shared lock\n");
> > + error = 1;
> > + goto out;
> > + }
> > + } else if (flock->fl_type == F_WRLCK) {
> > + /* check owner in lock */
> > + if (flock->fl_file != filp) {
> > + error = 1;
> > + ksmbd_err("not allow rw access by
> > exclusive lock from other opens\n");
> > + goto out;
> > + }
> > + }
> > + }
> > + }
> > +out:
> > + spin_unlock(&ctx->flc_lock);
> > + return error;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_read() - vfs helper for smb file read
> > + * @work: smb work
> > + * @fid: file id of open file
> > + * @count: read byte count
> > + * @pos: file pos
> > + *
> > + * Return: number of read bytes on success, otherwise error
> > + */
> > +int ksmbd_vfs_read(struct ksmbd_work *work,
> > + struct ksmbd_file *fp,
> > + size_t count,
> > + loff_t *pos)
> > +{
> > + struct file *filp;
> > + ssize_t nbytes = 0;
> > + char *rbuf, *name;
> > + struct inode *inode;
> > + char namebuf[NAME_MAX];
> > + int ret;
> > +
> > + rbuf = AUX_PAYLOAD(work);
> > + filp = fp->filp;
> > + inode = d_inode(filp->f_path.dentry);
> > + if (S_ISDIR(inode->i_mode))
> > + return -EISDIR;
> > +
> > + if (unlikely(count == 0))
> > + return 0;
> > +
> > + if (work->conn->connection_type) {
> > + if (!(fp->daccess & (FILE_READ_DATA_LE |
> > FILE_EXECUTE_LE))) {
> > + ksmbd_err("no right to read(%s)\n",
> > FP_FILENAME(fp));
> > + return -EACCES;
> > + }
> > + }
> > +
> > + if (ksmbd_stream_fd(fp))
> > + return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
> > +
> > + ret = check_lock_range(filp, *pos, *pos + count - 1,
> > + READ);
> > + if (ret) {
> > + ksmbd_err("unable to read due to lock\n");
> > + return -EAGAIN;
> > + }
> > +
> > + nbytes = kernel_read(filp, rbuf, count, pos);
> > + if (nbytes < 0) {
> > + name = d_path(&filp->f_path, namebuf, sizeof(namebuf));
> > + if (IS_ERR(name))
> > + name = "(error)";
> > + ksmbd_err("smb read failed for (%s), err = %zd\n",
> > + name, nbytes);
> > + return nbytes;
> > + }
> > +
> > + filp->f_pos = *pos;
> > + return nbytes;
> > +}
> > +
> > +static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t
> > *pos,
> > + size_t count)
> > +{
> > + char *stream_buf = NULL, *wbuf;
> > + size_t size, v_len;
> > + int err = 0;
> > +
> > + ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
> > + *pos, count);
> > +
> > + size = *pos + count;
> > + if (size > XATTR_SIZE_MAX) {
> > + size = XATTR_SIZE_MAX;
> > + count = (*pos + count) - XATTR_SIZE_MAX;
> > + }
> > +
> > + v_len = ksmbd_vfs_getcasexattr(fp->filp->f_path.dentry,
> > + fp->stream.name,
> > + fp->stream.size,
> > + &stream_buf);
> > + if (v_len == -ENOENT) {
> > + ksmbd_err("not found stream in xattr : %zd\n", v_len);
> > + err = -ENOENT;
> > + goto out;
> > + }
> > +
> > + if (v_len < size) {
> > + wbuf = ksmbd_alloc(size);
> > + if (!wbuf) {
> > + err = -ENOMEM;
> > + goto out;
> > + }
> > +
> > + if (v_len > 0)
> > + memcpy(wbuf, stream_buf, v_len);
> > + stream_buf = wbuf;
> > + }
> > +
> > + memcpy(&stream_buf[*pos], buf, count);
> > +
> > + err = ksmbd_vfs_setxattr(fp->filp->f_path.dentry,
> > + fp->stream.name,
> > + (void *)stream_buf,
> > + size,
> > + 0);
> > + if (err < 0)
> > + goto out;
> > +
> > + fp->filp->f_pos = *pos;
> > + err = 0;
> > +out:
> > + ksmbd_free(stream_buf);
> > + return err;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_write() - vfs helper for smb file write
> > + * @work: work
> > + * @fid: file id of open file
> > + * @buf: buf containing data for writing
> > + * @count: read byte count
> > + * @pos: file pos
> > + * @sync: fsync after write
> > + * @written: number of bytes written
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
> > + char *buf, size_t count, loff_t *pos, bool sync, ssize_t *written)
> > +{
> > + struct ksmbd_session *sess = work->sess;
> > + struct file *filp;
> > + loff_t offset = *pos;
> > + int err = 0;
> > +
> > + if (sess->conn->connection_type) {
> > + if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
> > + ksmbd_err("no right to write(%s)\n",
> > FP_FILENAME(fp));
> > + err = -EACCES;
> > + goto out;
> > + }
> > + }
> > +
> > + filp = fp->filp;
> > +
> > + if (ksmbd_stream_fd(fp)) {
> > + err = ksmbd_vfs_stream_write(fp, buf, pos, count);
> > + if (!err)
> > + *written = count;
> > + goto out;
> > + }
> > +
> > + err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
> > + if (err) {
> > + ksmbd_err("unable to write due to lock\n");
> > + err = -EAGAIN;
> > + goto out;
> > + }
> > +
> > + /* Do we need to break any of a levelII oplock? */
> > + smb_break_all_levII_oplock(work, fp, 1);
> > +
> > + err = kernel_write(filp, buf, count, pos);
> > + if (err < 0) {
> > + ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
> > + goto out;
> > + }
> > +
> > + filp->f_pos = *pos;
> > + *written = err;
> > + err = 0;
> > + if (sync) {
> > + err = vfs_fsync_range(filp, offset, offset + *written, 0);
> > + if (err < 0)
> > + ksmbd_err("fsync failed for filename = %s, err =
> > %d\n",
> > + FP_FILENAME(fp), err);
> > + }
> > +
> > +out:
> > + return err;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_getattr() - vfs helper for smb getattr
> > + * @work: work
> > + * @fid: file id of open file
> > + * @attrs: inode attributes
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +int ksmbd_vfs_getattr(struct path *path, struct kstat *stat)
> > +{
> > + int err;
> > +
> > + err = vfs_getattr(path, stat, STATX_BTIME,
> > AT_STATX_SYNC_AS_STAT);
> > + if (err)
> > + ksmbd_err("getattr failed, err %d\n", err);
> > + return err;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_fsync() - vfs helper for smb fsync
> > + * @work: work
> > + * @fid: file id of open file
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +int ksmbd_vfs_fsync(struct ksmbd_work *work, uint64_t fid, uint64_t p_id)
> > +{
> > + struct ksmbd_file *fp;
> > + int err;
> > +
> > + fp = ksmbd_lookup_fd_slow(work, fid, p_id);
> > + if (!fp) {
> > + ksmbd_err("failed to get filp for fid %llu\n", fid);
> > + return -ENOENT;
> > + }
> > + err = vfs_fsync(fp->filp, 0);
> > + if (err < 0)
> > + ksmbd_err("smb fsync failed, err = %d\n", err);
> > + ksmbd_fd_put(work, fp);
> > + return err;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
> > + * @name: absolute directory or file name
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name)
> > +{
> > + struct path parent;
> > + struct dentry *dir, *dentry;
> > + char *last;
> > + int err = -ENOENT;
> > +
> > + last = extract_last_component(name);
> > + if (!last)
> > + return -ENOENT;
> > +
> > + if (ksmbd_override_fsids(work))
> > + return -ENOMEM;
> > +
> > + err = kern_path(name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
> > &parent);
> > + if (err) {
> > + ksmbd_debug(VFS, "can't get %s, err %d\n", name, err);
> > + ksmbd_revert_fsids(work);
> > + rollback_path_modification(last);
> > + return err;
> > + }
> > +
> > + dir = parent.dentry;
> > + if (!d_inode(dir))
> > + goto out;
> > +
> > + inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
> > + dentry = lookup_one_len(last, dir, strlen(last));
> > + if (IS_ERR(dentry)) {
> > + err = PTR_ERR(dentry);
> > + ksmbd_debug(VFS, "%s: lookup failed, err %d\n", last, err);
> > + goto out_err;
> > + }
> > +
> > + if (!d_inode(dentry) || !d_inode(dentry)->i_nlink) {
> > + dput(dentry);
> > + err = -ENOENT;
> > + goto out_err;
> > + }
> > +
> > + if (S_ISDIR(d_inode(dentry)->i_mode)) {
> > + err = vfs_rmdir(&init_user_ns, d_inode(dir), dentry);
> > + if (err && err != -ENOTEMPTY)
> > + ksmbd_debug(VFS, "%s: rmdir failed, err %d\n",
> > name,
> > + err);
> > + } else {
> > + err = vfs_unlink(&init_user_ns, d_inode(dir), dentry, NULL);
> > + if (err)
> > + ksmbd_debug(VFS, "%s: unlink failed, err %d\n",
> > name,
> > + err);
> > + }
> > +
> > + dput(dentry);
> > +out_err:
> > + inode_unlock(d_inode(dir));
> > +out:
> > + rollback_path_modification(last);
> > + path_put(&parent);
> > + ksmbd_revert_fsids(work);
> > + return err;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_link() - vfs helper for creating smb hardlink
> > + * @oldname: source file name
> > + * @newname: hardlink name
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +int ksmbd_vfs_link(struct ksmbd_work *work,
> > + const char *oldname, const char *newname)
> > +{
> > + struct path oldpath, newpath;
> > + struct dentry *dentry;
> > + int err;
> > +
> > + if (ksmbd_override_fsids(work))
> > + return -ENOMEM;
> > +
> > + err = kern_path(oldname, LOOKUP_FOLLOW, &oldpath);
> > + if (err) {
> > + ksmbd_err("cannot get linux path for %s, err = %d\n",
> > + oldname, err);
> > + goto out1;
> > + }
> > +
> > + dentry = kern_path_create(AT_FDCWD, newname, &newpath,
> > + LOOKUP_FOLLOW | LOOKUP_REVAL);
> > + if (IS_ERR(dentry)) {
> > + err = PTR_ERR(dentry);
> > + ksmbd_err("path create err for %s, err %d\n", newname,
> > err);
> > + goto out2;
> > + }
> > +
> > + err = -EXDEV;
> > + if (oldpath.mnt != newpath.mnt) {
> > + ksmbd_err("vfs_link failed err %d\n", err);
> > + goto out3;
> > + }
> > +
> > + err = vfs_link(oldpath.dentry, &init_user_ns,
> > d_inode(newpath.dentry),
> > + dentry, NULL);
> > + if (err)
> > + ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
> > +
> > +out3:
> > + done_path_create(&newpath, dentry);
> > +out2:
> > + path_put(&oldpath);
> > +out1:
> > + ksmbd_revert_fsids(work);
> > + return err;
> > +}
> > +
> > +static int __ksmbd_vfs_rename(struct ksmbd_work *work,
> > + struct dentry *src_dent_parent,
> > + struct dentry *src_dent,
> > + struct dentry *dst_dent_parent,
> > + struct dentry *trap_dent,
> > + char *dst_name)
> > +{
> > + struct dentry *dst_dent;
> > + int err;
> > +
> > + spin_lock(&src_dent->d_lock);
> > + list_for_each_entry(dst_dent, &src_dent->d_subdirs, d_child) {
> > + struct ksmbd_file *child_fp;
> > +
> > + if (d_really_is_negative(dst_dent))
> > + continue;
> > +
> > + child_fp = ksmbd_lookup_fd_inode(d_inode(dst_dent));
> > + if (child_fp) {
> > + spin_unlock(&src_dent->d_lock);
> > + ksmbd_debug(VFS, "Forbid rename, sub file/dir is in
> > use\n");
> > + return -EACCES;
> > + }
> > + }
> > + spin_unlock(&src_dent->d_lock);
> > +
> > + if (d_really_is_negative(src_dent_parent))
> > + return -ENOENT;
> > + if (d_really_is_negative(dst_dent_parent))
> > + return -ENOENT;
> > + if (d_really_is_negative(src_dent))
> > + return -ENOENT;
> > + if (src_dent == trap_dent)
> > + return -EINVAL;
> > +
> > + if (ksmbd_override_fsids(work))
> > + return -ENOMEM;
> > +
> > + dst_dent = lookup_one_len(dst_name, dst_dent_parent,
> > strlen(dst_name));
> > + err = PTR_ERR(dst_dent);
> > + if (IS_ERR(dst_dent)) {
> > + ksmbd_err("lookup failed %s [%d]\n", dst_name, err);
> > + goto out;
> > + }
> > +
> > + err = -ENOTEMPTY;
> > + if (dst_dent != trap_dent && !d_really_is_positive(dst_dent)) {
> > + struct renamedata rd = {
> > + .old_mnt_userns = &init_user_ns,
> > + .old_dir = d_inode(src_dent_parent),
> > + .old_dentry = src_dent,
> > + .new_mnt_userns = &init_user_ns,
> > + .new_dir = d_inode(dst_dent_parent),
> > + .new_dentry = dst_dent,
> > + };
> > + err = vfs_rename(&rd);
> > + }
> > + if (err)
> > + ksmbd_err("vfs_rename failed err %d\n", err);
> > + if (dst_dent)
> > + dput(dst_dent);
> > +out:
> > + ksmbd_revert_fsids(work);
> > + return err;
> > +}
> > +
> > +int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file
> > *fp,
> > + char *newname)
> > +{
> > + struct path dst_path;
> > + struct dentry *src_dent_parent, *dst_dent_parent;
> > + struct dentry *src_dent, *trap_dent;
> > + char *dst_name;
> > + int err;
> > +
> > + dst_name = extract_last_component(newname);
> > + if (!dst_name)
> > + return -EINVAL;
> > +
> > + src_dent_parent = dget_parent(fp->filp->f_path.dentry);
> > + if (!src_dent_parent)
> > + return -EINVAL;
> > +
> > + src_dent = fp->filp->f_path.dentry;
> > + dget(src_dent);
> > +
> > + err = kern_path(newname, LOOKUP_FOLLOW |
> > LOOKUP_DIRECTORY, &dst_path);
> > + if (err) {
> > + ksmbd_debug(VFS, "Cannot get path for %s [%d]\n",
> > newname, err);
> > + goto out;
> > + }
> > + dst_dent_parent = dst_path.dentry;
> > + dget(dst_dent_parent);
> > +
> > + trap_dent = lock_rename(src_dent_parent, dst_dent_parent);
> > + err = __ksmbd_vfs_rename(work,
> > + src_dent_parent,
> > + src_dent,
> > + dst_dent_parent,
> > + trap_dent,
> > + dst_name);
> > + unlock_rename(src_dent_parent, dst_dent_parent);
> > + dput(dst_dent_parent);
> > + path_put(&dst_path);
> > +out:
> > + dput(src_dent);
> > + dput(src_dent_parent);
> > + return err;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_truncate() - vfs helper for smb file truncate
> > + * @work: work
> > + * @name: old filename
> > + * @fid: file id of old file
> > + * @size: truncate to given size
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +int ksmbd_vfs_truncate(struct ksmbd_work *work, const char *name,
> > + struct ksmbd_file *fp, loff_t size)
> > +{
> > + struct path path;
> > + int err = 0;
> > + struct inode *inode;
> > +
> > + if (name) {
> > + err = kern_path(name, 0, &path);
> > + if (err) {
> > + ksmbd_err("cannot get linux path for %s, err %d\n",
> > + name, err);
> > + return err;
> > + }
> > + err = vfs_truncate(&path, size);
> > + if (err)
> > + ksmbd_err("truncate failed for %s err %d\n",
> > + name, err);
> > + path_put(&path);
> > + } else {
> > + struct file *filp;
> > +
> > + filp = fp->filp;
> > +
> > + /* Do we need to break any of a levelII oplock? */
> > + smb_break_all_levII_oplock(work, fp, 1);
> > +
> > + inode = file_inode(filp);
> > + if (size < inode->i_size) {
> > + err = check_lock_range(filp, size,
> > + inode->i_size - 1, WRITE);
> > + } else {
> > + err = check_lock_range(filp, inode->i_size,
> > + size - 1, WRITE);
> > + }
> > +
> > + if (err) {
> > + ksmbd_err("failed due to lock\n");
> > + return -EAGAIN;
> > + }
> > +
> > + err = vfs_truncate(&filp->f_path, size);
> > + if (err)
> > + ksmbd_err("truncate failed for filename : %s err
> > %d\n",
> > + fp->filename, err);
> > + }
> > +
> > + return err;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
> > + * @dentry: dentry of file for listing xattrs
> > + * @list: destination buffer
> > + * @size: destination buffer length
> > + *
> > + * Return: xattr list length on success, otherwise error
> > + */
> > +ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
> > +{
> > + ssize_t size;
> > + char *vlist = NULL;
> > +
> > + size = vfs_listxattr(dentry, NULL, 0);
> > + if (size <= 0)
> > + return size;
> > +
> > + vlist = ksmbd_alloc(size);
> > + if (!vlist)
> > + return -ENOMEM;
> > +
> > + *list = vlist;
> > + size = vfs_listxattr(dentry, vlist, size);
> > + if (size < 0) {
> > + ksmbd_debug(VFS, "listxattr failed\n");
> > + ksmbd_vfs_xattr_free(vlist);
> > + *list = NULL;
> > + }
> > +
> > + return size;
> > +}
> > +
> > +static ssize_t ksmbd_vfs_xattr_len(struct dentry *dentry,
> > + char *xattr_name)
> > +{
> > + return vfs_getxattr(&init_user_ns, dentry, xattr_name, NULL, 0);
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
> > + * @dentry: dentry of file for getting xattrs
> > + * @xattr_name: name of xattr name to query
> > + * @xattr_buf: destination buffer xattr value
> > + *
> > + * Return: read xattr value length on success, otherwise error
> > + */
> > +ssize_t ksmbd_vfs_getxattr(struct dentry *dentry,
> > + char *xattr_name,
> > + char **xattr_buf)
> > +{
> > + ssize_t xattr_len;
> > + char *buf;
> > +
> > + *xattr_buf = NULL;
> > + xattr_len = ksmbd_vfs_xattr_len(dentry, xattr_name);
> > + if (xattr_len < 0)
> > + return xattr_len;
> > +
> > + buf = kmalloc(xattr_len + 1, GFP_KERNEL);
> > + if (!buf)
> > + return -ENOMEM;
> > +
> > + xattr_len = vfs_getxattr(&init_user_ns, dentry, xattr_name, (void
> > *)buf,
> > + xattr_len);
> > + if (xattr_len > 0)
> > + *xattr_buf = buf;
> > + else
> > + kfree(buf);
> > + return xattr_len;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
> > + * @dentry: dentry to set XATTR at
> > + * @name: xattr name for setxattr
> > + * @value: xattr value to set
> > + * @size: size of xattr value
> > + * @flags: destination buffer length
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +int ksmbd_vfs_setxattr(struct dentry *dentry,
> > + const char *attr_name,
> > + const void *attr_value,
> > + size_t attr_size,
> > + int flags)
> > +{
> > + int err;
> > +
> > + err = vfs_setxattr(&init_user_ns, dentry,
> > + attr_name,
> > + attr_value,
> > + attr_size,
> > + flags);
> > + if (err)
> > + ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
> > + return err;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux
> > options
> > + * @filp: file pointer for IO
> > + * @options: smb IO options
> > + */
> > +void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
> > +{
> > + struct address_space *mapping;
> > +
> > + mapping = filp->f_mapping;
> > +
> > + if (!option || !mapping)
> > + return;
> > +
> > + if (option & FILE_WRITE_THROUGH_LE)
> > + filp->f_flags |= O_SYNC;
> > + else if (option & FILE_SEQUENTIAL_ONLY_LE) {
> > + filp->f_ra.ra_pages = inode_to_bdi(mapping->host)-
> > >ra_pages * 2;
> > + spin_lock(&filp->f_lock);
> > + filp->f_mode &= ~FMODE_RANDOM;
> > + spin_unlock(&filp->f_lock);
> > + } else if (option & FILE_RANDOM_ACCESS_LE) {
> > + spin_lock(&filp->f_lock);
> > + filp->f_mode |= FMODE_RANDOM;
> > + spin_unlock(&filp->f_lock);
> > + }
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_lock() - vfs helper for smb file locking
> > + * @filp: the file to apply the lock to
> > + * @cmd: type of locking operation (F_SETLK, F_GETLK, etc.)
> > + * @flock: The lock to be applied
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +int ksmbd_vfs_lock(struct file *filp, int cmd,
> > + struct file_lock *flock)
> > +{
> > + ksmbd_debug(VFS, "calling vfs_lock_file\n");
> > + return vfs_lock_file(filp, cmd, flock, NULL);
> > +}
> > +
> > +int ksmbd_vfs_readdir(struct file *file, struct ksmbd_readdir_data *rdata)
> > +{
> > + return iterate_dir(file, &rdata->ctx);
> > +}
> > +
> > +int ksmbd_vfs_alloc_size(struct ksmbd_work *work,
> > + struct ksmbd_file *fp,
> > + loff_t len)
> > +{
> > + smb_break_all_levII_oplock(work, fp, 1);
> > + return vfs_fallocate(fp->filp, FALLOC_FL_KEEP_SIZE, 0, len);
> > +}
> > +
> > +int ksmbd_vfs_zero_data(struct ksmbd_work *work,
> > + struct ksmbd_file *fp,
> > + loff_t off,
> > + loff_t len)
> > +{
> > + smb_break_all_levII_oplock(work, fp, 1);
> > + if (fp->f_ci->m_fattr & ATTR_SPARSE_FILE_LE)
> > + return vfs_fallocate(fp->filp,
> > + FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
> > off, len);
> > +
> > + return vfs_fallocate(fp->filp, FALLOC_FL_ZERO_RANGE, off, len);
> > +}
> > +
> > +int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
> > + struct file_allocated_range_buffer *ranges,
> > + int in_count, int *out_count)
> > +{
> > + struct file *f = fp->filp;
> > + struct inode *inode = FP_INODE(fp);
> > + loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
> > + loff_t extent_start, extent_end;
> > + int ret = 0;
> > +
> > + if (start > maxbytes)
> > + return -EFBIG;
> > +
> > + if (!in_count)
> > + return 0;
> > +
> > + /*
> > + * Shrink request scope to what the fs can actually handle.
> > + */
> > + if (length > maxbytes || (maxbytes - length) < start)
> > + length = maxbytes - start;
> > +
> > + if (start + length > inode->i_size)
> > + length = inode->i_size - start;
> > +
> > + *out_count = 0;
> > + end = start + length;
> > + while (start < end && *out_count < in_count) {
> > + extent_start = f->f_op->llseek(f, start, SEEK_DATA);
> > + if (extent_start < 0) {
> > + if (extent_start != -ENXIO)
> > + ret = (int)extent_start;
> > + break;
> > + }
> > +
> > + if (extent_start >= end)
> > + break;
> > +
> > + extent_end = f->f_op->llseek(f, extent_start, SEEK_HOLE);
> > + if (extent_end < 0) {
> > + if (extent_end != -ENXIO)
> > + ret = (int)extent_end;
> > + break;
> > + } else if (extent_start >= extent_end)
> > + break;
> > +
> > + ranges[*out_count].file_offset = cpu_to_le64(extent_start);
> > + ranges[(*out_count)++].length =
> > + cpu_to_le64(min(extent_end, end) - extent_start);
> > +
> > + start = extent_end;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +int ksmbd_vfs_remove_xattr(struct dentry *dentry, char *attr_name)
> > +{
> > + return vfs_removexattr(&init_user_ns, dentry, attr_name);
> > +}
> > +
> > +void ksmbd_vfs_xattr_free(char *xattr)
> > +{
> > + ksmbd_free(xattr);
> > +}
> > +
> > +int ksmbd_vfs_unlink(struct dentry *dir, struct dentry *dentry)
> > +{
> > + int err = 0;
> > +
> > + dget(dentry);
> > + inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
> > + if (!d_inode(dentry) || !d_inode(dentry)->i_nlink) {
> > + err = -ENOENT;
> > + goto out;
> > + }
> > +
> > + if (S_ISDIR(d_inode(dentry)->i_mode))
> > + err = vfs_rmdir(&init_user_ns, d_inode(dir), dentry);
> > + else
> > + err = vfs_unlink(&init_user_ns, d_inode(dir), dentry, NULL);
> > +
> > +out:
> > + inode_unlock(d_inode(dir));
> > + dput(dentry);
> > + if (err)
> > + ksmbd_debug(VFS, "failed to delete, err %d\n", err);
> > +
> > + return err;
> > +}
> > +
> > +/*
> > + * ksmbd_vfs_get_logical_sector_size() - get logical sector size from inode
> > + * @inode: inode
> > + *
> > + * Return: logical sector size
> > + */
> > +unsigned short ksmbd_vfs_logical_sector_size(struct inode *inode)
> > +{
> > + struct request_queue *q;
> > + unsigned short ret_val = 512;
> > +
> > + if (!inode->i_sb->s_bdev)
> > + return ret_val;
> > +
> > + q = inode->i_sb->s_bdev->bd_disk->queue;
> > +
> > + if (q && q->limits.logical_block_size)
> > + ret_val = q->limits.logical_block_size;
> > +
> > + return ret_val;
> > +}
> > +
> > +/*
> > + * ksmbd_vfs_get_smb2_sector_size() - get fs sector sizes
> > + * @inode: inode
> > + * @fs_ss: fs sector size struct
> > + */
> > +void ksmbd_vfs_smb2_sector_size(struct inode *inode,
> > + struct ksmbd_fs_sector_size *fs_ss)
> > +{
> > + struct request_queue *q;
> > +
> > + fs_ss->logical_sector_size = 512;
> > + fs_ss->physical_sector_size = 512;
> > + fs_ss->optimal_io_size = 512;
> > +
> > + if (!inode->i_sb->s_bdev)
> > + return;
> > +
> > + q = inode->i_sb->s_bdev->bd_disk->queue;
> > +
> > + if (q) {
> > + if (q->limits.logical_block_size)
> > + fs_ss->logical_sector_size =
> > + q->limits.logical_block_size;
> > + if (q->limits.physical_block_size)
> > + fs_ss->physical_sector_size =
> > + q->limits.physical_block_size;
> > + if (q->limits.io_opt)
> > + fs_ss->optimal_io_size = q->limits.io_opt;
> > + }
> > +}
> > +
> > +static int __dir_empty(struct dir_context *ctx,
> > + const char *name,
> > + int namlen,
> > + loff_t offset,
> > + u64 ino,
> > + unsigned int d_type)
> > +{
> > + struct ksmbd_readdir_data *buf;
> > +
> > + buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
> > + buf->dirent_count++;
> > +
> > + if (buf->dirent_count > 2)
> > + return -ENOTEMPTY;
> > + return 0;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_empty_dir() - check for empty directory
> > + * @fp: ksmbd file pointer
> > + *
> > + * Return: true if directory empty, otherwise false
> > + */
> > +int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
> > +{
> > + int err;
> > + struct ksmbd_readdir_data readdir_data;
> > +
> > + memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
> > +
> > + set_ctx_actor(&readdir_data.ctx, __dir_empty);
> > + readdir_data.dirent_count = 0;
> > +
> > + err = ksmbd_vfs_readdir(fp->filp, &readdir_data);
> > + if (readdir_data.dirent_count > 2)
> > + err = -ENOTEMPTY;
> > + else
> > + err = 0;
> > + return err;
> > +}
> > +
> > +static int __caseless_lookup(struct dir_context *ctx,
> > + const char *name,
> > + int namlen,
> > + loff_t offset,
> > + u64 ino,
> > + unsigned int d_type)
> > +{
> > + struct ksmbd_readdir_data *buf;
> > +
> > + buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
> > +
> > + if (buf->used != namlen)
> > + return 0;
> > + if (!strncasecmp((char *)buf->private, name, namlen)) {
> > + memcpy((char *)buf->private, name, namlen);
> > + buf->dirent_count = 1;
> > + return -EEXIST;
> > + }
> > + return 0;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
> > + * @dirname: directory name
> > + * @filename: filename to lookup
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +static int ksmbd_vfs_lookup_in_dir(char *dirname, char *filename)
> > +{
> > + struct path dir_path;
> > + int ret;
> > + struct file *dfilp;
> > + int flags = O_RDONLY|O_LARGEFILE;
> > + int dirnamelen = strlen(dirname);
> > + struct ksmbd_readdir_data readdir_data = {
> > + .ctx.actor = __caseless_lookup,
> > + .private = filename,
> > + .used = strlen(filename),
> > + };
> > +
> > + ret = ksmbd_vfs_kern_path(dirname, 0, &dir_path, true);
> > + if (ret)
> > + goto error;
> > +
> > + dfilp = dentry_open(&dir_path, flags, current_cred());
> > + if (IS_ERR(dfilp)) {
> > + path_put(&dir_path);
> > + ksmbd_err("cannot open directory %s\n", dirname);
> > + ret = -EINVAL;
> > + goto error;
> > + }
> > +
> > + ret = ksmbd_vfs_readdir(dfilp, &readdir_data);
> > + if (readdir_data.dirent_count > 0)
> > + ret = 0;
> > +
> > + fput(dfilp);
> > + path_put(&dir_path);
> > +error:
> > + dirname[dirnamelen] = '/';
> > + return ret;
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_kern_path() - lookup a file and get path info
> > + * @name: name of file for lookup
> > + * @flags: lookup flags
> > + * @path: if lookup succeed, return path info
> > + * @caseless: caseless filename lookup
> > + *
> > + * Return: 0 on success, otherwise error
> > + */
> > +int ksmbd_vfs_kern_path(char *name, unsigned int flags, struct path
> > *path,
> > + bool caseless)
> > +{
> > + char *filename = NULL;
> > + int err;
> > +
> > + err = kern_path(name, flags, path);
> > + if (!err)
> > + return err;
> > +
> > + if (caseless) {
> > + filename = extract_last_component(name);
> > + if (!filename)
> > + goto out;
> > +
> > + /* root reached */
> > + if (strlen(name) == 0)
> > + goto out;
> > +
> > + err = ksmbd_vfs_lookup_in_dir(name, filename);
> > + if (err)
> > + goto out;
> > + err = kern_path(name, flags, path);
> > + }
> > +
> > +out:
> > + rollback_path_modification(filename);
> > + return err;
> > +}
> > +
> > +int ksmbd_vfs_remove_acl_xattrs(struct dentry *dentry)
> > +{
> > + char *name, *xattr_list = NULL;
> > + ssize_t xattr_list_len;
> > + int err = 0;
> > +
> > + xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
> > + if (xattr_list_len < 0) {
> > + goto out;
> > + } else if (!xattr_list_len) {
> > + ksmbd_debug(SMB, "empty xattr in the file\n");
> > + goto out;
> > + }
> > +
> > + for (name = xattr_list; name - xattr_list < xattr_list_len;
> > + name += strlen(name) + 1) {
> > + ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
> > +
> > + if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
> > + sizeof(XATTR_NAME_POSIX_ACL_ACCESS)-1) ||
> > + !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
> > + sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)-1)) {
> > + err = ksmbd_vfs_remove_xattr(dentry, name);
> > + if (err)
> > + ksmbd_debug(SMB,
> > + "remove acl xattr failed : %s\n",
> > name);
> > + }
> > + }
> > +out:
> > + ksmbd_vfs_xattr_free(xattr_list);
> > + return err;
> > +}
> > +
> > +int ksmbd_vfs_remove_sd_xattrs(struct dentry *dentry)
> > +{
> > + char *name, *xattr_list = NULL;
> > + ssize_t xattr_list_len;
> > + int err = 0;
> > +
> > + xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
> > + if (xattr_list_len < 0) {
> > + goto out;
> > + } else if (!xattr_list_len) {
> > + ksmbd_debug(SMB, "empty xattr in the file\n");
> > + goto out;
> > + }
> > +
> > + for (name = xattr_list; name - xattr_list < xattr_list_len;
> > + name += strlen(name) + 1) {
> > + ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
> > +
> > + if (!strncmp(name, XATTR_NAME_SD,
> > XATTR_NAME_SD_LEN)) {
> > + err = ksmbd_vfs_remove_xattr(dentry, name);
> > + if (err)
> > + ksmbd_debug(SMB, "remove xattr failed :
> > %s\n", name);
> > + }
> > + }
> > +out:
> > + ksmbd_vfs_xattr_free(xattr_list);
> > + return err;
> > +}
> > +
> > +static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct inode
> > *inode,
> > + int acl_type)
> > +{
> > + struct xattr_smb_acl *smb_acl = NULL;
> > + struct posix_acl *posix_acls;
> > + struct posix_acl_entry *pa_entry;
> > + struct xattr_acl_entry *xa_entry;
> > + int i;
> > +
> > + posix_acls = ksmbd_vfs_get_acl(inode, acl_type);
> > + if (!posix_acls)
> > + return NULL;
> > +
> > + smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
> > + sizeof(struct xattr_acl_entry) * posix_acls-
> > >a_count,
> > + GFP_KERNEL);
> > + if (!smb_acl)
> > + goto out;
> > +
> > + smb_acl->count = posix_acls->a_count;
> > + pa_entry = posix_acls->a_entries;
> > + xa_entry = smb_acl->entries;
> > + for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
> > + switch (pa_entry->e_tag) {
> > + case ACL_USER:
> > + xa_entry->type = SMB_ACL_USER;
> > + xa_entry->uid = from_kuid(&init_user_ns, pa_entry-
> > >e_uid);
> > + break;
> > + case ACL_USER_OBJ:
> > + xa_entry->type = SMB_ACL_USER_OBJ;
> > + break;
> > + case ACL_GROUP:
> > + xa_entry->type = SMB_ACL_GROUP;
> > + xa_entry->gid = from_kgid(&init_user_ns, pa_entry-
> > >e_gid);
> > + break;
> > + case ACL_GROUP_OBJ:
> > + xa_entry->type = SMB_ACL_GROUP_OBJ;
> > + break;
> > + case ACL_OTHER:
> > + xa_entry->type = SMB_ACL_OTHER;
> > + break;
> > + case ACL_MASK:
> > + xa_entry->type = SMB_ACL_MASK;
> > + break;
> > + default:
> > + ksmbd_err("unknown type : 0x%x\n", pa_entry-
> > >e_tag);
> > + goto out;
> > + }
> > +
> > + if (pa_entry->e_perm & ACL_READ)
> > + xa_entry->perm |= SMB_ACL_READ;
> > + if (pa_entry->e_perm & ACL_WRITE)
> > + xa_entry->perm |= SMB_ACL_WRITE;
> > + if (pa_entry->e_perm & ACL_EXECUTE)
> > + xa_entry->perm |= SMB_ACL_EXECUTE;
> > + }
> > +out:
> > + posix_acl_release(posix_acls);
> > + return smb_acl;
> > +}
> > +
> > +int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn, struct dentry
> > *dentry,
> > + struct smb_ntsd *pntsd, int len)
> > +{
> > + int rc;
> > + struct ndr sd_ndr = {0}, acl_ndr = {0};
> > + struct xattr_ntacl acl = {0};
> > + struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
> > + struct inode *inode = dentry->d_inode;
> > +
> > + acl.version = 4;
> > + acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
> > + acl.current_time = ksmbd_UnixTimeToNT(current_time(dentry-
> > >d_inode));
> > +
> > + memcpy(acl.desc, "posix_acl", 9);
> > + acl.desc_len = 10;
> > +
> > + pntsd->osidoffset =
> > + cpu_to_le32(le32_to_cpu(pntsd->osidoffset) +
> > NDR_NTSD_OFFSETOF);
> > + pntsd->gsidoffset =
> > + cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) +
> > NDR_NTSD_OFFSETOF);
> > + pntsd->dacloffset =
> > + cpu_to_le32(le32_to_cpu(pntsd->dacloffset) +
> > NDR_NTSD_OFFSETOF);
> > +
> > + acl.sd_buf = (char *)pntsd;
> > + acl.sd_size = len;
> > +
> > + rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
> > + if (rc) {
> > + ksmbd_err("failed to generate hash for ndr acl\n");
> > + return rc;
> > + }
> > +
> > + smb_acl = ksmbd_vfs_make_xattr_posix_acl(dentry->d_inode,
> > ACL_TYPE_ACCESS);
> > + if (S_ISDIR(inode->i_mode))
> > + def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(dentry-
> > >d_inode,
> > + ACL_TYPE_DEFAULT);
> > +
> > + rc = ndr_encode_posix_acl(&acl_ndr, inode, smb_acl, def_smb_acl);
> > + if (rc) {
> > + ksmbd_err("failed to encode ndr to posix acl\n");
> > + goto out;
> > + }
> > +
> > + rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
> > + acl.posix_acl_hash);
> > + if (rc) {
> > + ksmbd_err("failed to generate hash for ndr acl\n");
> > + goto out;
> > + }
> > +
> > + rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
> > + if (rc) {
> > + ksmbd_err("failed to encode ndr to posix acl\n");
> > + goto out;
> > + }
> > +
> > + rc = ksmbd_vfs_setxattr(dentry, XATTR_NAME_SD, sd_ndr.data,
> > + sd_ndr.offset, 0);
> > + if (rc < 0)
> > + ksmbd_err("Failed to store XATTR ntacl :%d\n", rc);
> > +
> > + kfree(sd_ndr.data);
> > +out:
> > + kfree(acl_ndr.data);
> > + kfree(smb_acl);
> > + kfree(def_smb_acl);
> > + return rc;
> > +}
> > +
> > +int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn, struct dentry
> > *dentry,
> > + struct smb_ntsd **pntsd)
> > +{
> > + int rc;
> > + struct ndr n;
> > +
> > + rc = ksmbd_vfs_getxattr(dentry, XATTR_NAME_SD, &n.data);
> > + if (rc > 0) {
> > + struct inode *inode = dentry->d_inode;
> > + struct ndr acl_ndr = {0};
> > + struct xattr_ntacl acl;
> > + struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl =
> > NULL;
> > + __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
> > +
> > + n.length = rc;
> > + rc = ndr_decode_v4_ntacl(&n, &acl);
> > + if (rc)
> > + return rc;
> > +
> > + smb_acl = ksmbd_vfs_make_xattr_posix_acl(inode,
> > + ACL_TYPE_ACCESS);
> > + if (S_ISDIR(inode->i_mode))
> > + def_smb_acl =
> > ksmbd_vfs_make_xattr_posix_acl(inode,
> > + ACL_TYPE_DEFAULT);
> > +
> > + rc = ndr_encode_posix_acl(&acl_ndr, inode, smb_acl,
> > def_smb_acl);
> > + if (rc) {
> > + ksmbd_err("failed to encode ndr to posix acl\n");
> > + goto out;
> > + }
> > +
> > + rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
> > + cmp_hash);
> > + if (rc) {
> > + ksmbd_err("failed to generate hash for ndr acl\n");
> > + goto out;
> > + }
> > +
> > + if (memcmp(cmp_hash, acl.posix_acl_hash,
> > XATTR_SD_HASH_SIZE)) {
> > + ksmbd_err("hash value diff\n");
> > + rc = -EINVAL;
> > + goto out;
> > + }
> > +
> > + *pntsd = acl.sd_buf;
> > + (*pntsd)->osidoffset =
> > + cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
> > NDR_NTSD_OFFSETOF);
> > + (*pntsd)->gsidoffset =
> > + cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
> > NDR_NTSD_OFFSETOF);
> > + (*pntsd)->dacloffset =
> > + cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
> > NDR_NTSD_OFFSETOF);
> > +
> > + rc = acl.sd_size;
> > +out:
> > + kfree(n.data);
> > + kfree(acl_ndr.data);
> > + kfree(smb_acl);
> > + kfree(def_smb_acl);
> > + }
> > +
> > + return rc;
> > +}
> > +
> > +int ksmbd_vfs_set_dos_attrib_xattr(struct dentry *dentry,
> > + struct xattr_dos_attrib *da)
> > +{
> > + struct ndr n;
> > + int err;
> > +
> > + err = ndr_encode_dos_attr(&n, da);
> > + if (err)
> > + return err;
> > +
> > + err = ksmbd_vfs_setxattr(dentry,
> > + XATTR_NAME_DOS_ATTRIBUTE,
> > + (void *)n.data,
> > + n.offset,
> > + 0);
> > + if (err)
> > + ksmbd_debug(SMB, "failed to store dos attribute in
> > xattr\n");
> > + kfree(n.data);
> > +
> > + return err;
> > +}
> > +
> > +int ksmbd_vfs_get_dos_attrib_xattr(struct dentry *dentry,
> > + struct xattr_dos_attrib *da)
> > +{
> > + struct ndr n;
> > + int err;
> > +
> > + err = ksmbd_vfs_getxattr(dentry,
> > + XATTR_NAME_DOS_ATTRIBUTE,
> > + (char **)&n.data);
> > + if (err > 0) {
> > + n.length = err;
> > + if (ndr_decode_dos_attr(&n, da))
> > + err = -EINVAL;
> > + ksmbd_free(n.data);
> > + } else
> > + ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
> > +
> > + return err;
> > +}
> > +
> > +struct posix_acl *ksmbd_vfs_posix_acl_alloc(int count, gfp_t flags)
> > +{
> > +#if IS_ENABLED(CONFIG_FS_POSIX_ACL)
> > + return posix_acl_alloc(count, flags);
> > +#else
> > + return NULL;
> > +#endif
> > +}
> > +
> > +struct posix_acl *ksmbd_vfs_get_acl(struct inode *inode, int type)
> > +{
> > +#if IS_ENABLED(CONFIG_FS_POSIX_ACL)
> > + return get_acl(inode, type);
> > +#else
> > + return NULL;
> > +#endif
> > +}
> > +
> > +int ksmbd_vfs_set_posix_acl(struct inode *inode, int type,
> > + struct posix_acl *acl)
> > +{
> > +#if IS_ENABLED(CONFIG_FS_POSIX_ACL)
> > + return set_posix_acl(&init_user_ns, inode, type, acl);
> > +#else
> > + return -EOPNOTSUPP;
> > +#endif
> > +}
> > +
> > +/**
> > + * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
> > + * @p: destination buffer
> > + * @ksmbd_kstat: ksmbd kstat wrapper
> > + */
> > +void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
> > +{
> > + struct file_directory_info *info = (struct file_directory_info *)(*p);
> > + struct kstat *kstat = ksmbd_kstat->kstat;
> > + u64 time;
> > +
> > + info->FileIndex = 0;
> > + info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
> > + time = ksmbd_UnixTimeToNT(kstat->atime);
> > + info->LastAccessTime = cpu_to_le64(time);
> > + time = ksmbd_UnixTimeToNT(kstat->mtime);
> > + info->LastWriteTime = cpu_to_le64(time);
> > + time = ksmbd_UnixTimeToNT(kstat->ctime);
> > + info->ChangeTime = cpu_to_le64(time);
> > +
> > + if (ksmbd_kstat->file_attributes & ATTR_DIRECTORY_LE) {
> > + info->EndOfFile = 0;
> > + info->AllocationSize = 0;
> > + } else {
> > + info->EndOfFile = cpu_to_le64(kstat->size);
> > + info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
> > + }
> > + info->ExtFileAttributes = ksmbd_kstat->file_attributes;
> > +
> > + return info;
> > +}
> > +
> > +int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
> > + struct dentry *dentry,
> > + struct ksmbd_kstat *ksmbd_kstat)
> > +{
> > + u64 time;
> > + int rc;
> > +
> > + generic_fillattr(&init_user_ns, d_inode(dentry), ksmbd_kstat-
> > >kstat);
> > +
> > + time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
> > + ksmbd_kstat->create_time = time;
> > +
> > + /*
> > + * set default value for the case that store dos attributes is not yes
> > + * or that acl is disable in server's filesystem and the config is yes.
> > + */
> > + if (S_ISDIR(ksmbd_kstat->kstat->mode))
> > + ksmbd_kstat->file_attributes = ATTR_DIRECTORY_LE;
> > + else
> > + ksmbd_kstat->file_attributes = ATTR_ARCHIVE_LE;
> > +
> > + if (test_share_config_flag(work->tcon->share_conf,
> > + KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
> > + struct xattr_dos_attrib da;
> > +
> > + rc = ksmbd_vfs_get_dos_attrib_xattr(dentry, &da);
> > + if (rc > 0) {
> > + ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
> > + ksmbd_kstat->create_time = da.create_time;
> > + } else
> > + ksmbd_debug(VFS, "fail to load dos attribute.\n");
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +ssize_t ksmbd_vfs_casexattr_len(struct dentry *dentry,
> > + char *attr_name,
> > + int attr_name_len)
> > +{
> > + char *name, *xattr_list = NULL;
> > + ssize_t value_len = -ENOENT, xattr_list_len;
> > +
> > + xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
> > + if (xattr_list_len <= 0)
> > + goto out;
> > +
> > + for (name = xattr_list; name - xattr_list < xattr_list_len;
> > + name += strlen(name) + 1) {
> > + ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
> > + if (strncasecmp(attr_name, name, attr_name_len))
> > + continue;
> > +
> > + value_len = ksmbd_vfs_xattr_len(dentry, name);
> > + break;
> > + }
> > +
> > +out:
> > + ksmbd_vfs_xattr_free(xattr_list);
> > + return value_len;
> > +}
> > +
> > +int ksmbd_vfs_xattr_stream_name(char *stream_name,
> > + char **xattr_stream_name,
> > + size_t *xattr_stream_name_size,
> > + int s_type)
> > +{
> > + int stream_name_size;
> > + char *xattr_stream_name_buf;
> > + char *type;
> > + int type_len;
> > +
> > + if (s_type == DIR_STREAM)
> > + type = ":$INDEX_ALLOCATION";
> > + else
> > + type = ":$DATA";
> > +
> > + type_len = strlen(type);
> > + stream_name_size = strlen(stream_name);
> > + *xattr_stream_name_size = stream_name_size +
> > XATTR_NAME_STREAM_LEN + 1;
> > + xattr_stream_name_buf = kmalloc(*xattr_stream_name_size +
> > type_len,
> > + GFP_KERNEL);
> > + if (!xattr_stream_name_buf)
> > + return -ENOMEM;
> > +
> > + memcpy(xattr_stream_name_buf,
> > + XATTR_NAME_STREAM,
> > + XATTR_NAME_STREAM_LEN);
> > +
> > + if (stream_name_size) {
> > +
> > memcpy(&xattr_stream_name_buf[XATTR_NAME_STREAM_LEN],
> > + stream_name,
> > + stream_name_size);
> > + }
> > + memcpy(&xattr_stream_name_buf[*xattr_stream_name_size - 1],
> > type, type_len);
> > + *xattr_stream_name_size += type_len;
> > +
> > + xattr_stream_name_buf[*xattr_stream_name_size - 1] = '\0';
> > + *xattr_stream_name = xattr_stream_name_buf;
> > +
> > + return 0;
> > +}
> > +
> > +static int ksmbd_vfs_copy_file_range(struct file *file_in, loff_t pos_in,
> > + struct file *file_out, loff_t pos_out,
> > + size_t len)
> > +{
> > + struct inode *inode_in = file_inode(file_in);
> > + struct inode *inode_out = file_inode(file_out);
> > + int ret;
> > +
> > + ret = vfs_copy_file_range(file_in, pos_in, file_out, pos_out, len, 0);
> > + /* do splice for the copy between different file systems */
> > + if (ret != -EXDEV)
> > + return ret;
> > +
> > + if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode))
> > + return -EISDIR;
> > + if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
> > + return -EINVAL;
> > +
> > + if (!(file_in->f_mode & FMODE_READ) ||
> > + !(file_out->f_mode & FMODE_WRITE))
> > + return -EBADF;
> > +
> > + if (len == 0)
> > + return 0;
> > +
> > + file_start_write(file_out);
> > +
> > + /*
> > + * skip the verification of the range of data. it will be done
> > + * in do_splice_direct
> > + */
> > + ret = do_splice_direct(file_in, &pos_in, file_out, &pos_out,
> > + len > MAX_RW_COUNT ? MAX_RW_COUNT : len, 0);
> > + if (ret > 0) {
> > + fsnotify_access(file_in);
> > + add_rchar(current, ret);
> > + fsnotify_modify(file_out);
> > + add_wchar(current, ret);
> > + }
> > +
> > + inc_syscr(current);
> > + inc_syscw(current);
> > +
> > + file_end_write(file_out);
> > + return ret;
> > +}
> > +
> > +int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
> > + struct ksmbd_file *src_fp,
> > + struct ksmbd_file *dst_fp,
> > + struct srv_copychunk *chunks,
> > + unsigned int chunk_count,
> > + unsigned int *chunk_count_written,
> > + unsigned int *chunk_size_written,
> > + loff_t *total_size_written)
> > +{
> > + unsigned int i;
> > + loff_t src_off, dst_off, src_file_size;
> > + size_t len;
> > + int ret;
> > +
> > + *chunk_count_written = 0;
> > + *chunk_size_written = 0;
> > + *total_size_written = 0;
> > +
> > + if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
> > + ksmbd_err("no right to read(%s)\n", FP_FILENAME(src_fp));
> > + return -EACCES;
> > + }
> > + if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE |
> > FILE_APPEND_DATA_LE))) {
> > + ksmbd_err("no right to write(%s)\n",
> > FP_FILENAME(dst_fp));
> > + return -EACCES;
> > + }
> > +
> > + if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
> > + return -EBADF;
> > +
> > + smb_break_all_levII_oplock(work, dst_fp, 1);
> > +
> > + for (i = 0; i < chunk_count; i++) {
> > + src_off = le64_to_cpu(chunks[i].SourceOffset);
> > + dst_off = le64_to_cpu(chunks[i].TargetOffset);
> > + len = le32_to_cpu(chunks[i].Length);
> > +
> > + if (check_lock_range(src_fp->filp, src_off,
> > + src_off + len - 1, READ))
> > + return -EAGAIN;
> > + if (check_lock_range(dst_fp->filp, dst_off,
> > + dst_off + len - 1, WRITE))
> > + return -EAGAIN;
> > + }
> > +
> > + src_file_size = i_size_read(file_inode(src_fp->filp));
> > +
> > + for (i = 0; i < chunk_count; i++) {
> > + src_off = le64_to_cpu(chunks[i].SourceOffset);
> > + dst_off = le64_to_cpu(chunks[i].TargetOffset);
> > + len = le32_to_cpu(chunks[i].Length);
> > +
> > + if (src_off + len > src_file_size)
> > + return -E2BIG;
> > +
> > + ret = ksmbd_vfs_copy_file_range(src_fp->filp, src_off,
> > + dst_fp->filp, dst_off, len);
> > + if (ret < 0)
> > + return ret;
> > +
> > + *chunk_count_written += 1;
> > + *total_size_written += ret;
> > + }
> > + return 0;
> > +}
> > +
> > +int ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
> > +{
> > + return wait_event_interruptible(flock->fl_wait, !flock->fl_blocker);
> > +}
> > +
> > +int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long
> > timeout)
> > +{
> > + return wait_event_interruptible_timeout(flock->fl_wait,
> > + !flock->fl_blocker,
> > + timeout);
> > +}
> > +
> > +void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
> > +{
> > + locks_delete_block(flock);
> > +}
> > +
> > +int ksmbd_vfs_set_init_posix_acl(struct inode *inode)
> > +{
> > + struct posix_acl_state acl_state;
> > + struct posix_acl *acls;
> > + int rc;
> > +
> > + ksmbd_debug(SMB, "Set posix acls\n");
> > + rc = init_acl_state(&acl_state, 1);
> > + if (rc)
> > + return rc;
> > +
> > + /* Set default owner group */
> > + acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
> > + acl_state.group.allow = (inode->i_mode & 0070) >> 3;
> > + acl_state.other.allow = inode->i_mode & 0007;
> > + acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
> > + acl_state.users->aces[acl_state.users->n++].perms.allow =
> > + acl_state.owner.allow;
> > + acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
> > + acl_state.groups->aces[acl_state.groups->n++].perms.allow =
> > + acl_state.group.allow;
> > + acl_state.mask.allow = 0x07;
> > +
> > + acls = ksmbd_vfs_posix_acl_alloc(6, GFP_KERNEL);
> > + if (!acls) {
> > + free_acl_state(&acl_state);
> > + return -ENOMEM;
> > + }
> > + posix_state_to_acl(&acl_state, acls->a_entries);
> > + rc = ksmbd_vfs_set_posix_acl(inode, ACL_TYPE_ACCESS, acls);
> > + if (rc < 0)
> > + ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed,
> > rc : %d\n",
> > + rc);
> > + else if (S_ISDIR(inode->i_mode)) {
> > + posix_state_to_acl(&acl_state, acls->a_entries);
> > + rc = ksmbd_vfs_set_posix_acl(inode, ACL_TYPE_DEFAULT,
> > acls);
> > + if (rc < 0)
> > + ksmbd_debug(SMB, "Set posix
> > acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
> > + rc);
> > + }
> > + free_acl_state(&acl_state);
> > + posix_acl_release(acls);
> > + return rc;
> > +}
> > +
> > +int ksmbd_vfs_inherit_posix_acl(struct inode *inode, struct inode
> > *parent_inode)
> > +{
> > + struct posix_acl *acls;
> > + struct posix_acl_entry *pace;
> > + int rc, i;
> > +
> > + acls = ksmbd_vfs_get_acl(parent_inode, ACL_TYPE_DEFAULT);
> > + if (!acls)
> > + return -ENOENT;
> > + pace = acls->a_entries;
> > +
> > + for (i = 0; i < acls->a_count; i++, pace++) {
> > + if (pace->e_tag == ACL_MASK) {
> > + pace->e_perm = 0x07;
> > + break;
> > + }
> > + }
> > +
> > + rc = ksmbd_vfs_set_posix_acl(inode, ACL_TYPE_ACCESS, acls);
> > + if (rc < 0)
> > + ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed,
> > rc : %d\n",
> > + rc);
> > + if (S_ISDIR(inode->i_mode)) {
> > + rc = ksmbd_vfs_set_posix_acl(inode, ACL_TYPE_DEFAULT,
> > acls);
> > + if (rc < 0)
> > + ksmbd_debug(SMB, "Set posix
> > acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
> > + rc);
> > + }
> > + posix_acl_release(acls);
> > + return rc;
> > +}
> > diff --git a/fs/cifsd/vfs.h b/fs/cifsd/vfs.h
> > new file mode 100644
> > index 000000000000..bbef5c20c146
> > --- /dev/null
> > +++ b/fs/cifsd/vfs.h
> > @@ -0,0 +1,314 @@
> > +/* SPDX-License-Identifier: GPL-2.0-or-later */
> > +/*
> > + * Copyright (C) 2016 Namjae Jeon <linkinjeon@...nel.org>
> > + * Copyright (C) 2018 Samsung Electronics Co., Ltd.
> > + */
> > +
> > +#ifndef __KSMBD_VFS_H__
> > +#define __KSMBD_VFS_H__
> > +
> > +#include <linux/file.h>
> > +#include <linux/fs.h>
> > +#include <linux/namei.h>
> > +#include <uapi/linux/xattr.h>
> > +#include <linux/posix_acl.h>
> > +
> > +#include "smbacl.h"
> > +
> > +/* STREAM XATTR PREFIX */
> > +#define STREAM_PREFIX "DosStream."
> > +#define STREAM_PREFIX_LEN (sizeof(STREAM_PREFIX) - 1)
> > +#define XATTR_NAME_STREAM (XATTR_USER_PREFIX
> > STREAM_PREFIX)
> > +#define XATTR_NAME_STREAM_LEN
> > (sizeof(XATTR_NAME_STREAM) - 1)
> > +
> > +enum {
> > + XATTR_DOSINFO_ATTRIB = 0x00000001,
> > + XATTR_DOSINFO_EA_SIZE = 0x00000002,
> > + XATTR_DOSINFO_SIZE = 0x00000004,
> > + XATTR_DOSINFO_ALLOC_SIZE = 0x00000008,
> > + XATTR_DOSINFO_CREATE_TIME = 0x00000010,
> > + XATTR_DOSINFO_CHANGE_TIME = 0x00000020,
> > + XATTR_DOSINFO_ITIME = 0x00000040
> > +};
> > +
> > +struct xattr_dos_attrib {
> > + __u16 version;
> > + __u32 flags;
> > + __u32 attr;
> > + __u32 ea_size;
> > + __u64 size;
> > + __u64 alloc_size;
> > + __u64 create_time;
> > + __u64 change_time;
> > + __u64 itime;
> > +};
> > +
> > +/* DOS ATTRIBUITE XATTR PREFIX */
> > +#define DOS_ATTRIBUTE_PREFIX "DOSATTRIB"
> > +#define DOS_ATTRIBUTE_PREFIX_LEN
> > (sizeof(DOS_ATTRIBUTE_PREFIX) - 1)
> > +#define XATTR_NAME_DOS_ATTRIBUTE \
> > + (XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX)
> > +#define XATTR_NAME_DOS_ATTRIBUTE_LEN \
> > + (sizeof(XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX) - 1)
> > +
> > +#define XATTR_SD_HASH_TYPE_SHA256 0x1
> > +#define XATTR_SD_HASH_SIZE 64
> > +
> > +#define SMB_ACL_READ 4
> > +#define SMB_ACL_WRITE 2
> > +#define SMB_ACL_EXECUTE 1
> > +
> > +enum {
> > + SMB_ACL_TAG_INVALID = 0,
> > + SMB_ACL_USER,
> > + SMB_ACL_USER_OBJ,
> > + SMB_ACL_GROUP,
> > + SMB_ACL_GROUP_OBJ,
> > + SMB_ACL_OTHER,
> > + SMB_ACL_MASK
> > +};
> > +
> > +struct xattr_acl_entry {
> > + int type;
> > + uid_t uid;
> > + gid_t gid;
> > + mode_t perm;
> > +};
> > +
> > +struct xattr_smb_acl {
> > + int count;
> > + int next;
> > + struct xattr_acl_entry entries[0];
> > +};
> > +
> > +struct xattr_ntacl {
> > + __u16 version;
> > + void *sd_buf;
> > + __u32 sd_size;
> > + __u16 hash_type;
> > + __u8 desc[10];
> > + __u16 desc_len;
> > + __u64 current_time;
> > + __u8 hash[XATTR_SD_HASH_SIZE];
> > + __u8 posix_acl_hash[XATTR_SD_HASH_SIZE];
> > +};
> > +
> > +/* SECURITY DESCRIPTOR XATTR PREFIX */
> > +#define SD_PREFIX "NTACL"
> > +#define SD_PREFIX_LEN (sizeof(SD_PREFIX) - 1)
> > +#define XATTR_NAME_SD \
> > + (XATTR_SECURITY_PREFIX SD_PREFIX)
> > +#define XATTR_NAME_SD_LEN \
> > + (sizeof(XATTR_SECURITY_PREFIX SD_PREFIX) - 1)
> > +
> > +
> > +/* CreateOptions */
> > +/* Flag is set, it must not be a file , valid for directory only */
> > +#define FILE_DIRECTORY_FILE_LE
> > cpu_to_le32(0x00000001)
> > +#define FILE_WRITE_THROUGH_LE
> > cpu_to_le32(0x00000002)
> > +#define FILE_SEQUENTIAL_ONLY_LE
> > cpu_to_le32(0x00000004)
> > +
> > +/* Should not buffer on server*/
> > +#define FILE_NO_INTERMEDIATE_BUFFERING_LE
> > cpu_to_le32(0x00000008)
> > +/* MBZ */
> > +#define FILE_SYNCHRONOUS_IO_ALERT_LE
> > cpu_to_le32(0x00000010)
> > +/* MBZ */
> > +#define FILE_SYNCHRONOUS_IO_NONALERT_LE
> > cpu_to_le32(0x00000020)
> > +
> > +/* Flaf must not be set for directory */
> > +#define FILE_NON_DIRECTORY_FILE_LE
> > cpu_to_le32(0x00000040)
> > +
> > +/* Should be zero */
> > +#define CREATE_TREE_CONNECTION
> > cpu_to_le32(0x00000080)
> > +#define FILE_COMPLETE_IF_OPLOCKED_LE
> > cpu_to_le32(0x00000100)
> > +#define FILE_NO_EA_KNOWLEDGE_LE
> > cpu_to_le32(0x00000200)
> > +#define FILE_OPEN_REMOTE_INSTANCE
> > cpu_to_le32(0x00000400)
> > +
> > +/**
> > + * Doc says this is obsolete "open for recovery" flag should be zero
> > + * in any case.
> > + */
> > +#define CREATE_OPEN_FOR_RECOVERY
> > cpu_to_le32(0x00000400)
> > +#define FILE_RANDOM_ACCESS_LE
> > cpu_to_le32(0x00000800)
> > +#define FILE_DELETE_ON_CLOSE_LE
> > cpu_to_le32(0x00001000)
> > +#define FILE_OPEN_BY_FILE_ID_LE
> > cpu_to_le32(0x00002000)
> > +#define FILE_OPEN_FOR_BACKUP_INTENT_LE
> > cpu_to_le32(0x00004000)
> > +#define FILE_NO_COMPRESSION_LE
> > cpu_to_le32(0x00008000)
> > +
> > +/* Should be zero*/
> > +#define FILE_OPEN_REQUIRING_OPLOCK
> > cpu_to_le32(0x00010000)
> > +#define FILE_DISALLOW_EXCLUSIVE
> > cpu_to_le32(0x00020000)
> > +#define FILE_RESERVE_OPFILTER_LE cpu_to_le32(0x00100000)
> > +#define FILE_OPEN_REPARSE_POINT_LE
> > cpu_to_le32(0x00200000)
> > +#define FILE_OPEN_NO_RECALL_LE
> > cpu_to_le32(0x00400000)
> > +
> > +/* Should be zero */
> > +#define FILE_OPEN_FOR_FREE_SPACE_QUERY_LE
> > cpu_to_le32(0x00800000)
> > +#define CREATE_OPTIONS_MASK
> > cpu_to_le32(0x00FFFFFF)
> > +#define CREATE_OPTION_READONLY 0x10000000
> > +/* system. NB not sent over wire */
> > +#define CREATE_OPTION_SPECIAL 0x20000000
> > +
> > +struct ksmbd_work;
> > +struct ksmbd_file;
> > +struct ksmbd_conn;
> > +
> > +struct ksmbd_dir_info {
> > + const char *name;
> > + char *wptr;
> > + char *rptr;
> > + int name_len;
> > + int out_buf_len;
> > + int num_entry;
> > + int data_count;
> > + int last_entry_offset;
> > + bool hide_dot_file;
> > + int flags;
> > +};
> > +
> > +struct ksmbd_readdir_data {
> > + struct dir_context ctx;
> > + union {
> > + void *private;
> > + char *dirent;
> > + };
> > +
> > + unsigned int used;
> > + unsigned int dirent_count;
> > + unsigned int file_attr;
> > +};
> > +
> > +/* ksmbd kstat wrapper to get valid create time when reading dir entry */
> > +struct ksmbd_kstat {
> > + struct kstat *kstat;
> > + unsigned long long create_time;
> > + __le32 file_attributes;
> > +};
> > +
> > +struct ksmbd_fs_sector_size {
> > + unsigned short logical_sector_size;
> > + unsigned int physical_sector_size;
> > + unsigned int optimal_io_size;
> > +};
> > +
> > +int ksmbd_vfs_inode_permission(struct dentry *dentry, int acc_mode,
> > + bool delete);
> > +int ksmbd_vfs_query_maximal_access(struct dentry *dentry, __le32
> > *daccess);
> > +int ksmbd_vfs_create(struct ksmbd_work *work, const char *name,
> > umode_t mode);
> > +int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name,
> > umode_t mode);
> > +int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp,
> > + size_t count, loff_t *pos);
> > +int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
> > + char *buf, size_t count, loff_t *pos, bool sync, ssize_t *written);
> > +int ksmbd_vfs_fsync(struct ksmbd_work *work, uint64_t fid, uint64_t
> > p_id);
> > +int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name);
> > +int ksmbd_vfs_link(struct ksmbd_work *work,
> > + const char *oldname, const char *newname);
> > +int ksmbd_vfs_getattr(struct path *path, struct kstat *stat);
> > +int ksmbd_vfs_symlink(const char *name, const char *symname);
> > +int ksmbd_vfs_readlink(struct path *path, char *buf, int lenp);
> > +
> > +int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file
> > *fp,
> > + char *newname);
> > +int ksmbd_vfs_rename_slowpath(struct ksmbd_work *work,
> > + char *oldname, char *newname);
> > +
> > +int ksmbd_vfs_truncate(struct ksmbd_work *work, const char *name,
> > + struct ksmbd_file *fp, loff_t size);
> > +
> > +struct srv_copychunk;
> > +int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
> > + struct ksmbd_file *src_fp,
> > + struct ksmbd_file *dst_fp,
> > + struct srv_copychunk *chunks,
> > + unsigned int chunk_count,
> > + unsigned int *chunk_count_written,
> > + unsigned int *chunk_size_written,
> > + loff_t *total_size_written);
> > +
> > +struct ksmbd_file *ksmbd_vfs_dentry_open(struct ksmbd_work *work,
> > + const struct path *path,
> > + int flags,
> > + __le32 option,
> > + int fexist);
> > +
> > +ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list);
> > +ssize_t ksmbd_vfs_getxattr(struct dentry *dentry,
> > + char *xattr_name,
> > + char **xattr_buf);
> > +
> > +ssize_t ksmbd_vfs_casexattr_len(struct dentry *dentry,
> > + char *attr_name,
> > + int attr_name_len);
> > +
> > +int ksmbd_vfs_setxattr(struct dentry *dentry,
> > + const char *attr_name,
> > + const void *attr_value,
> > + size_t attr_size,
> > + int flags);
> > +
> > +int ksmbd_vfs_fsetxattr(const char *filename,
> > + const char *attr_name,
> > + const void *attr_value,
> > + size_t attr_size,
> > + int flags);
> > +
> > +int ksmbd_vfs_xattr_stream_name(char *stream_name,
> > + char **xattr_stream_name,
> > + size_t *xattr_stream_name_size,
> > + int s_type);
> > +
> > +int ksmbd_vfs_truncate_xattr(struct dentry *dentry, int wo_streams);
> > +int ksmbd_vfs_remove_xattr(struct dentry *dentry, char *attr_name);
> > +void ksmbd_vfs_xattr_free(char *xattr);
> > +
> > +int ksmbd_vfs_kern_path(char *name, unsigned int flags, struct path
> > *path,
> > + bool caseless);
> > +int ksmbd_vfs_empty_dir(struct ksmbd_file *fp);
> > +void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option);
> > +int ksmbd_vfs_lock(struct file *filp, int cmd, struct file_lock *flock);
> > +int ksmbd_vfs_readdir(struct file *file, struct ksmbd_readdir_data *rdata);
> > +int ksmbd_vfs_alloc_size(struct ksmbd_work *work,
> > + struct ksmbd_file *fp,
> > + loff_t len);
> > +int ksmbd_vfs_zero_data(struct ksmbd_work *work,
> > + struct ksmbd_file *fp,
> > + loff_t off,
> > + loff_t len);
> > +
> > +struct file_allocated_range_buffer;
> > +int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
> > + struct file_allocated_range_buffer *ranges,
> > + int in_count, int *out_count);
> > +int ksmbd_vfs_unlink(struct dentry *dir, struct dentry *dentry);
> > +unsigned short ksmbd_vfs_logical_sector_size(struct inode *inode);
> > +void ksmbd_vfs_smb2_sector_size(struct inode *inode,
> > + struct ksmbd_fs_sector_size *fs_ss);
> > +void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat);
> > +
> > +int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
> > + struct dentry *dentry,
> > + struct ksmbd_kstat *ksmbd_kstat);
> > +
> > +int ksmbd_vfs_posix_lock_wait(struct file_lock *flock);
> > +int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long
> > timeout);
> > +void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock);
> > +
> > +int ksmbd_vfs_remove_acl_xattrs(struct dentry *dentry);
> > +int ksmbd_vfs_remove_sd_xattrs(struct dentry *dentry);
> > +int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn, struct dentry
> > *dentry,
> > + struct smb_ntsd *pntsd, int len);
> > +int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn, struct dentry
> > *dentry,
> > + struct smb_ntsd **pntsd);
> > +int ksmbd_vfs_set_dos_attrib_xattr(struct dentry *dentry,
> > + struct xattr_dos_attrib *da);
> > +int ksmbd_vfs_get_dos_attrib_xattr(struct dentry *dentry,
> > + struct xattr_dos_attrib *da);
> > +struct posix_acl *ksmbd_vfs_posix_acl_alloc(int count, gfp_t flags);
> > +struct posix_acl *ksmbd_vfs_get_acl(struct inode *inode, int type);
> > +int ksmbd_vfs_set_posix_acl(struct inode *inode, int type,
> > + struct posix_acl *acl);
> > +int ksmbd_vfs_set_init_posix_acl(struct inode *inode);
> > +int ksmbd_vfs_inherit_posix_acl(struct inode *inode,
> > + struct inode *parent_inode);
> > +#endif /* __KSMBD_VFS_H__ */
> > diff --git a/fs/cifsd/vfs_cache.c b/fs/cifsd/vfs_cache.c
> > new file mode 100644
> > index 000000000000..af92fab5b7ae
> > --- /dev/null
> > +++ b/fs/cifsd/vfs_cache.c
> > @@ -0,0 +1,851 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + * Copyright (C) 2016 Namjae Jeon <linkinjeon@...nel.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 __exit ksmbd_release_inode_hash(void)
> > +{
> > + vfree(inode_hashtable);
> > +}
> > +
> > +static void __ksmbd_inode_close(struct ksmbd_file *fp)
> > +{
> > + struct dentry *dir, *dentry;
> > + struct ksmbd_inode *ci = fp->f_ci;
> > + int err;
> > + struct file *filp;
> > +
> > + filp = fp->filp;
> > + if (ksmbd_stream_fd(fp) && (ci->m_flags &
> > S_DEL_ON_CLS_STREAM)) {
> > + ci->m_flags &= ~S_DEL_ON_CLS_STREAM;
> > + err = ksmbd_vfs_remove_xattr(filp->f_path.dentry,
> > + fp->stream.name);
> > + if (err)
> > + ksmbd_err("remove xattr failed : %s\n",
> > + fp->stream.name);
> > + }
> > +
> > + if (atomic_dec_and_test(&ci->m_count)) {
> > + write_lock(&ci->m_lock);
> > + if (ci->m_flags & (S_DEL_ON_CLS | S_DEL_PENDING)) {
> > + dentry = filp->f_path.dentry;
> > + dir = dentry->d_parent;
> > + ci->m_flags &= ~(S_DEL_ON_CLS | S_DEL_PENDING);
> > + write_unlock(&ci->m_lock);
> > + ksmbd_vfs_unlink(dir, dentry);
> > + write_lock(&ci->m_lock);
> > + }
> > + write_unlock(&ci->m_lock);
> > +
> > + ksmbd_inode_free(ci);
> > + }
> > +}
> > +
> > +static void __ksmbd_remove_durable_fd(struct ksmbd_file *fp)
> > +{
> > + if (!HAS_FILE_ID(fp->persistent_id))
> > + return;
> > +
> > + write_lock(&global_ft.lock);
> > + idr_remove(global_ft.idr, fp->persistent_id);
> > + write_unlock(&global_ft.lock);
> > +}
> > +
> > +static void __ksmbd_remove_fd(struct ksmbd_file_table *ft,
> > + struct ksmbd_file *fp)
> > +{
> > + if (!HAS_FILE_ID(fp->volatile_id))
> > + return;
> > +
> > + write_lock(&fp->f_ci->m_lock);
> > + list_del_init(&fp->node);
> > + write_unlock(&fp->f_ci->m_lock);
> > +
> > + write_lock(&ft->lock);
> > + idr_remove(ft->idr, fp->volatile_id);
> > + write_unlock(&ft->lock);
> > +}
> > +
> > +static void __ksmbd_close_fd(struct ksmbd_file_table *ft,
> > + struct ksmbd_file *fp)
> > +{
> > + struct file *filp;
> > +
> > + fd_limit_close();
> > + __ksmbd_remove_durable_fd(fp);
> > + __ksmbd_remove_fd(ft, fp);
> > +
> > + close_id_del_oplock(fp);
> > + filp = fp->filp;
> > +
> > + __ksmbd_inode_close(fp);
> > + if (!IS_ERR_OR_NULL(filp))
> > + fput(filp);
> > + kfree(fp->filename);
> > + if (ksmbd_stream_fd(fp))
> > + kfree(fp->stream.name);
> > + ksmbd_free_file_struct(fp);
> > +}
> > +
> > +static struct ksmbd_file *ksmbd_fp_get(struct ksmbd_file *fp)
> > +{
> > + if (!atomic_inc_not_zero(&fp->refcount))
> > + return NULL;
> > + return fp;
> > +}
> > +
> > +static struct ksmbd_file *__ksmbd_lookup_fd(struct ksmbd_file_table *ft,
> > + unsigned int id)
> > +{
> > + bool unclaimed = true;
> > + struct ksmbd_file *fp;
> > +
> > + read_lock(&ft->lock);
> > + fp = idr_find(ft->idr, id);
> > + if (fp)
> > + fp = ksmbd_fp_get(fp);
> > +
> > + if (fp && fp->f_ci) {
> > + read_lock(&fp->f_ci->m_lock);
> > + unclaimed = list_empty(&fp->node);
> > + read_unlock(&fp->f_ci->m_lock);
> > + }
> > + read_unlock(&ft->lock);
> > +
> > + if (fp && unclaimed) {
> > + atomic_dec(&fp->refcount);
> > + return NULL;
> > + }
> > + return fp;
> > +}
> > +
> > +static void __put_fd_final(struct ksmbd_work *work,
> > + struct ksmbd_file *fp)
> > +{
> > + __ksmbd_close_fd(&work->sess->file_table, fp);
> > + atomic_dec(&work->conn->stats.open_files_count);
> > +}
> > +
> > +static void set_close_state_blocked_works(struct ksmbd_file *fp)
> > +{
> > + struct ksmbd_work *cancel_work, *ctmp;
> > +
> > + spin_lock(&fp->f_lock);
> > + list_for_each_entry_safe(cancel_work, ctmp, &fp->blocked_works,
> > + fp_entry) {
> > + list_del(&cancel_work->fp_entry);
> > + cancel_work->state = KSMBD_WORK_CLOSED;
> > + cancel_work->cancel_fn(cancel_work->cancel_argv);
> > + }
> > + spin_unlock(&fp->f_lock);
> > +}
> > +
> > +int ksmbd_close_fd(struct ksmbd_work *work, unsigned int id)
> > +{
> > + struct ksmbd_file *fp;
> > + struct ksmbd_file_table *ft;
> > +
> > + if (!HAS_FILE_ID(id))
> > + return 0;
> > +
> > + ft = &work->sess->file_table;
> > + read_lock(&ft->lock);
> > + fp = idr_find(ft->idr, id);
> > + if (fp) {
> > + set_close_state_blocked_works(fp);
> > +
> > + if (!atomic_dec_and_test(&fp->refcount))
> > + fp = NULL;
> > + }
> > + read_unlock(&ft->lock);
> > +
> > + if (!fp)
> > + return -EINVAL;
> > +
> > + __put_fd_final(work, fp);
> > + return 0;
> > +}
> > +
> > +void ksmbd_fd_put(struct ksmbd_work *work,
> > + struct ksmbd_file *fp)
> > +{
> > + if (!fp)
> > + return;
> > +
> > + if (!atomic_dec_and_test(&fp->refcount))
> > + return;
> > + __put_fd_final(work, fp);
> > +}
> > +
> > +static bool __sanity_check(struct ksmbd_tree_connect *tcon,
> > + struct ksmbd_file *fp)
> > +{
> > + if (!fp)
> > + return false;
> > + if (fp->tcon != tcon)
> > + return false;
> > + return true;
> > +}
> > +
> > +struct ksmbd_file *ksmbd_lookup_foreign_fd(struct ksmbd_work *work,
> > + unsigned int id)
> > +{
> > + return __ksmbd_lookup_fd(&work->sess->file_table, id);
> > +}
> > +
> > +struct ksmbd_file *ksmbd_lookup_fd_fast(struct ksmbd_work *work,
> > + unsigned int id)
> > +{
> > + struct ksmbd_file *fp = __ksmbd_lookup_fd(&work->sess-
> > >file_table, id);
> > +
> > + if (__sanity_check(work->tcon, fp))
> > + return fp;
> > +
> > + ksmbd_fd_put(work, fp);
> > + return NULL;
> > +}
> > +
> > +struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work,
> > + unsigned int id,
> > + unsigned int pid)
> > +{
> > + struct ksmbd_file *fp;
> > +
> > + if (!HAS_FILE_ID(id)) {
> > + id = work->compound_fid;
> > + pid = work->compound_pfid;
> > + }
> > +
> > + if (!HAS_FILE_ID(id))
> > + return NULL;
> > +
> > + fp = __ksmbd_lookup_fd(&work->sess->file_table, id);
> > + if (!__sanity_check(work->tcon, fp)) {
> > + ksmbd_fd_put(work, fp);
> > + return NULL;
> > + }
> > + if (fp->persistent_id != pid) {
> > + ksmbd_fd_put(work, fp);
> > + return NULL;
> > + }
> > + return fp;
> > +}
> > +
> > +struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id)
> > +{
> > + return __ksmbd_lookup_fd(&global_ft, id);
> > +}
> > +
> > +int ksmbd_close_fd_app_id(struct ksmbd_work *work,
> > + char *app_id)
> > +{
> > + struct ksmbd_file *fp = NULL;
> > + unsigned int id;
> > +
> > + read_lock(&global_ft.lock);
> > + idr_for_each_entry(global_ft.idr, fp, id) {
> > + if (!memcmp(fp->app_instance_id,
> > + app_id,
> > + SMB2_CREATE_GUID_SIZE)) {
> > + if (!atomic_dec_and_test(&fp->refcount))
> > + fp = NULL;
> > + break;
> > + }
> > + }
> > + read_unlock(&global_ft.lock);
> > +
> > + if (!fp)
> > + return -EINVAL;
> > +
> > + __put_fd_final(work, fp);
> > + return 0;
> > +}
> > +
> > +struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid)
> > +{
> > + struct ksmbd_file *fp = NULL;
> > + unsigned int id;
> > +
> > + read_lock(&global_ft.lock);
> > + idr_for_each_entry(global_ft.idr, fp, id) {
> > + if (!memcmp(fp->create_guid,
> > + cguid,
> > + SMB2_CREATE_GUID_SIZE)) {
> > + fp = ksmbd_fp_get(fp);
> > + break;
> > + }
> > + }
> > + read_unlock(&global_ft.lock);
> > +
> > + return fp;
> > +}
> > +
> > +struct ksmbd_file *ksmbd_lookup_fd_filename(struct ksmbd_work *work,
> > + char *filename)
> > +{
> > + struct ksmbd_file *fp = NULL;
> > + unsigned int id;
> > +
> > + read_lock(&work->sess->file_table.lock);
> > + idr_for_each_entry(work->sess->file_table.idr, fp, id) {
> > + if (!strcmp(fp->filename, filename)) {
> > + fp = ksmbd_fp_get(fp);
> > + break;
> > + }
> > + }
> > + read_unlock(&work->sess->file_table.lock);
> > +
> > + return fp;
> > +}
> > +
> > +struct ksmbd_file *ksmbd_lookup_fd_inode(struct inode *inode)
> > +{
> > + struct ksmbd_file *lfp;
> > + struct ksmbd_inode *ci;
> > + struct list_head *cur;
> > +
> > + ci = ksmbd_inode_lookup_by_vfsinode(inode);
> > + if (!ci)
> > + return NULL;
> > +
> > + read_lock(&ci->m_lock);
> > + list_for_each(cur, &ci->m_fp_list) {
> > + lfp = list_entry(cur, struct ksmbd_file, node);
> > + if (inode == FP_INODE(lfp)) {
> > + atomic_dec(&ci->m_count);
> > + read_unlock(&ci->m_lock);
> > + return lfp;
> > + }
> > + }
> > + atomic_dec(&ci->m_count);
> > + read_unlock(&ci->m_lock);
> > + return NULL;
> > +}
> > +
> > +#define OPEN_ID_TYPE_VOLATILE_ID (0)
> > +#define OPEN_ID_TYPE_PERSISTENT_ID (1)
> > +
> > +static void __open_id_set(struct ksmbd_file *fp, unsigned int id, int type)
> > +{
> > + if (type == OPEN_ID_TYPE_VOLATILE_ID)
> > + fp->volatile_id = id;
> > + if (type == OPEN_ID_TYPE_PERSISTENT_ID)
> > + fp->persistent_id = id;
> > +}
> > +
> > +static int __open_id(struct ksmbd_file_table *ft,
> > + struct ksmbd_file *fp,
> > + int type)
> > +{
> > + unsigned int id = 0;
> > + int ret;
> > +
> > + if (type == OPEN_ID_TYPE_VOLATILE_ID && fd_limit_depleted()) {
> > + __open_id_set(fp, KSMBD_NO_FID, type);
> > + return -EMFILE;
> > + }
> > +
> > + idr_preload(GFP_KERNEL);
> > + write_lock(&ft->lock);
> > + ret = idr_alloc_cyclic(ft->idr, fp, 0, INT_MAX, GFP_NOWAIT);
> > + if (ret >= 0) {
> > + id = ret;
> > + ret = 0;
> > + } else {
> > + id = KSMBD_NO_FID;
> > + fd_limit_close();
> > + }
> > +
> > + __open_id_set(fp, id, type);
> > + write_unlock(&ft->lock);
> > + idr_preload_end();
> > + return ret;
> > +}
> > +
> > +unsigned int ksmbd_open_durable_fd(struct ksmbd_file *fp)
> > +{
> > + __open_id(&global_ft, fp, OPEN_ID_TYPE_PERSISTENT_ID);
> > + return fp->persistent_id;
> > +}
> > +
> > +struct ksmbd_file *ksmbd_open_fd(struct ksmbd_work *work,
> > + struct file *filp)
> > +{
> > + struct ksmbd_file *fp;
> > + int ret;
> > +
> > + fp = ksmbd_alloc_file_struct();
> > + if (!fp) {
> > + ksmbd_err("Failed to allocate memory\n");
> > + return ERR_PTR(-ENOMEM);
> > + }
> > +
> > + INIT_LIST_HEAD(&fp->blocked_works);
> > + INIT_LIST_HEAD(&fp->node);
> > + spin_lock_init(&fp->f_lock);
> > + atomic_set(&fp->refcount, 1);
> > +
> > + fp->filp = filp;
> > + fp->conn = work->sess->conn;
> > + fp->tcon = work->tcon;
> > + fp->volatile_id = KSMBD_NO_FID;
> > + fp->persistent_id = KSMBD_NO_FID;
> > + fp->f_ci = ksmbd_inode_get(fp);
> > +
> > + if (!fp->f_ci) {
> > + ksmbd_free_file_struct(fp);
> > + return ERR_PTR(-ENOMEM);
> > + }
> > +
> > + ret = __open_id(&work->sess->file_table, fp,
> > OPEN_ID_TYPE_VOLATILE_ID);
> > + if (ret) {
> > + ksmbd_inode_put(fp->f_ci);
> > + ksmbd_free_file_struct(fp);
> > + return ERR_PTR(ret);
> > + }
> > +
> > + atomic_inc(&work->conn->stats.open_files_count);
> > + return fp;
> > +}
> > +
> > +static inline bool is_reconnectable(struct ksmbd_file *fp)
> > +{
> > + struct oplock_info *opinfo = opinfo_get(fp);
> > + bool reconn = false;
> > +
> > + if (!opinfo)
> > + return false;
> > +
> > + if (opinfo->op_state != OPLOCK_STATE_NONE) {
> > + opinfo_put(opinfo);
> > + return false;
> > + }
> > +
> > + if (fp->is_resilient || fp->is_persistent)
> > + reconn = true;
> > + else if (fp->is_durable && opinfo->is_lease &&
> > + opinfo->o_lease->state &
> > SMB2_LEASE_HANDLE_CACHING_LE)
> > + reconn = true;
> > +
> > + else if (fp->is_durable && opinfo->level ==
> > SMB2_OPLOCK_LEVEL_BATCH)
> > + reconn = true;
> > +
> > + opinfo_put(opinfo);
> > + return reconn;
> > +}
> > +
> > +static int
> > +__close_file_table_ids(struct ksmbd_file_table *ft,
> > + struct ksmbd_tree_connect *tcon,
> > + bool (*skip)(struct ksmbd_tree_connect *tcon,
> > + struct ksmbd_file *fp))
> > +{
> > + unsigned int id;
> > + struct ksmbd_file *fp;
> > + int num = 0;
> > +
> > + idr_for_each_entry(ft->idr, fp, id) {
> > + if (skip(tcon, fp))
> > + continue;
> > +
> > + set_close_state_blocked_works(fp);
> > +
> > + if (!atomic_dec_and_test(&fp->refcount))
> > + continue;
> > + __ksmbd_close_fd(ft, fp);
> > + num++;
> > + }
> > + return num;
> > +}
> > +
> > +static bool tree_conn_fd_check(struct ksmbd_tree_connect *tcon,
> > + struct ksmbd_file *fp)
> > +{
> > + return fp->tcon != tcon;
> > +}
> > +
> > +static bool session_fd_check(struct ksmbd_tree_connect *tcon,
> > + struct ksmbd_file *fp)
> > +{
> > + if (!is_reconnectable(fp))
> > + return false;
> > +
> > + fp->conn = NULL;
> > + fp->tcon = NULL;
> > + fp->volatile_id = KSMBD_NO_FID;
> > + return true;
> > +}
> > +
> > +void ksmbd_close_tree_conn_fds(struct ksmbd_work *work)
> > +{
> > + int num = __close_file_table_ids(&work->sess->file_table,
> > + work->tcon,
> > + tree_conn_fd_check);
> > +
> > + atomic_sub(num, &work->conn->stats.open_files_count);
> > +}
> > +
> > +void ksmbd_close_session_fds(struct ksmbd_work *work)
> > +{
> > + int num = __close_file_table_ids(&work->sess->file_table,
> > + work->tcon,
> > + session_fd_check);
> > +
> > + atomic_sub(num, &work->conn->stats.open_files_count);
> > +}
> > +
> > +int ksmbd_init_global_file_table(void)
> > +{
> > + return ksmbd_init_file_table(&global_ft);
> > +}
> > +
> > +void ksmbd_free_global_file_table(void)
> > +{
> > + struct ksmbd_file *fp = NULL;
> > + unsigned int id;
> > +
> > + idr_for_each_entry(global_ft.idr, fp, id) {
> > + __ksmbd_remove_durable_fd(fp);
> > + ksmbd_free_file_struct(fp);
> > + }
> > +
> > + ksmbd_destroy_file_table(&global_ft);
> > +}
> > +
> > +int ksmbd_reopen_durable_fd(struct ksmbd_work *work,
> > + struct ksmbd_file *fp)
> > +{
> > + if (!fp->is_durable || fp->conn || fp->tcon) {
> > + ksmbd_err("Invalid durable fd [%p:%p]\n",
> > + fp->conn, fp->tcon);
> > + return -EBADF;
> > + }
> > +
> > + if (HAS_FILE_ID(fp->volatile_id)) {
> > + ksmbd_err("Still in use durable fd: %u\n", fp->volatile_id);
> > + return -EBADF;
> > + }
> > +
> > + fp->conn = work->sess->conn;
> > + fp->tcon = work->tcon;
> > +
> > + __open_id(&work->sess->file_table, fp,
> > OPEN_ID_TYPE_VOLATILE_ID);
> > + if (!HAS_FILE_ID(fp->volatile_id)) {
> > + fp->conn = NULL;
> > + fp->tcon = NULL;
> > + return -EBADF;
> > + }
> > + return 0;
> > +}
> > +
> > +static void close_fd_list(struct ksmbd_work *work, struct list_head *head)
> > +{
> > + while (!list_empty(head)) {
> > + struct ksmbd_file *fp;
> > +
> > + fp = list_first_entry(head, struct ksmbd_file, node);
> > + list_del_init(&fp->node);
> > +
> > + __ksmbd_close_fd(&work->sess->file_table, fp);
> > + }
> > +}
> > +
> > +int ksmbd_close_inode_fds(struct ksmbd_work *work, struct inode
> > *inode)
> > +{
> > + struct ksmbd_inode *ci;
> > + bool unlinked = true;
> > + struct ksmbd_file *fp, *fptmp;
> > + LIST_HEAD(dispose);
> > +
> > + ci = ksmbd_inode_lookup_by_vfsinode(inode);
> > + if (!ci)
> > + return true;
> > +
> > + if (ci->m_flags & (S_DEL_ON_CLS | S_DEL_PENDING))
> > + unlinked = false;
> > +
> > + write_lock(&ci->m_lock);
> > + list_for_each_entry_safe(fp, fptmp, &ci->m_fp_list, node) {
> > + if (fp->conn)
> > + continue;
> > +
> > + list_del(&fp->node);
> > + list_add(&fp->node, &dispose);
> > + }
> > + atomic_dec(&ci->m_count);
> > + write_unlock(&ci->m_lock);
> > +
> > + close_fd_list(work, &dispose);
> > + return unlinked;
> > +}
> > +
> > +int ksmbd_file_table_flush(struct ksmbd_work *work)
> > +{
> > + struct ksmbd_file *fp = NULL;
> > + unsigned int id;
> > + int ret;
> > +
> > + read_lock(&work->sess->file_table.lock);
> > + idr_for_each_entry(work->sess->file_table.idr, fp, id) {
> > + ret = ksmbd_vfs_fsync(work, fp->volatile_id,
> > KSMBD_NO_FID);
> > + if (ret)
> > + break;
> > + }
> > + read_unlock(&work->sess->file_table.lock);
> > + return ret;
> > +}
> > +
> > +int ksmbd_init_file_table(struct ksmbd_file_table *ft)
> > +{
> > + ft->idr = ksmbd_alloc(sizeof(struct idr));
> > + if (!ft->idr)
> > + return -ENOMEM;
> > +
> > + idr_init(ft->idr);
> > + rwlock_init(&ft->lock);
> > + return 0;
> > +}
> > +
> > +void ksmbd_destroy_file_table(struct ksmbd_file_table *ft)
> > +{
> > + if (!ft->idr)
> > + return;
> > +
> > + __close_file_table_ids(ft, NULL, session_fd_check);
> > + idr_destroy(ft->idr);
> > + ksmbd_free(ft->idr);
> > + ft->idr = NULL;
> > +}
> > diff --git a/fs/cifsd/vfs_cache.h b/fs/cifsd/vfs_cache.h
> > new file mode 100644
> > index 000000000000..7d23657c86c6
> > --- /dev/null
> > +++ b/fs/cifsd/vfs_cache.h
> > @@ -0,0 +1,213 @@
> > +/* SPDX-License-Identifier: GPL-2.0-or-later */
> > +/*
> > + * Copyright (C) 2019 Samsung Electronics Co., Ltd.
> > + */
> > +
> > +#ifndef __VFS_CACHE_H__
> > +#define __VFS_CACHE_H__
> > +
> > +#include <linux/version.h>
> > +#include <linux/file.h>
> > +#include <linux/fs.h>
> > +#include <linux/rwsem.h>
> > +#include <linux/spinlock.h>
> > +#include <linux/idr.h>
> > +#include <linux/workqueue.h>
> > +
> > +#include "vfs.h"
> > +
> > +/* Windows style file permissions for extended response */
> > +#define FILE_GENERIC_ALL 0x1F01FF
> > +#define FILE_GENERIC_READ 0x120089
> > +#define FILE_GENERIC_WRITE 0x120116
> > +#define FILE_GENERIC_EXECUTE 0X1200a0
> > +
> > +#define KSMBD_START_FID 0
> > +#define KSMBD_NO_FID (UINT_MAX)
> > +#define SMB2_NO_FID (0xFFFFFFFFFFFFFFFFULL)
> > +
> > +#define FP_FILENAME(fp) fp->filp->f_path.dentry-
> > >d_name.name
> > +#define FP_INODE(fp) fp->filp->f_path.dentry->d_inode
> > +#define PARENT_INODE(fp) fp->filp->f_path.dentry->d_parent->d_inode
> > +
> > +#define ATTR_FP(fp) (fp->attrib_only && \
> > + (fp->cdoption != FILE_OVERWRITE_IF_LE && \
> > + fp->cdoption != FILE_OVERWRITE_LE && \
> > + fp->cdoption != FILE_SUPERSEDE_LE))
> > +
> > +struct ksmbd_conn;
> > +struct ksmbd_session;
> > +
> > +struct ksmbd_lock {
> > + struct file_lock *fl;
> > + struct list_head glist;
> > + struct list_head llist;
> > + unsigned int flags;
> > + int cmd;
> > + int zero_len;
> > + unsigned long long start;
> > + unsigned long long end;
> > +};
> > +
> > +struct stream {
> > + char *name;
> > + ssize_t size;
> > +};
> > +
> > +struct ksmbd_inode {
> > + rwlock_t m_lock;
> > + atomic_t m_count;
> > + atomic_t op_count;
> > + /* opinfo count for streams */
> > + atomic_t sop_count;
> > + struct inode *m_inode;
> > + unsigned int m_flags;
> > + struct hlist_node m_hash;
> > + struct list_head m_fp_list;
> > + struct list_head m_op_list;
> > + struct oplock_info *m_opinfo;
> > + __le32 m_fattr;
> > +};
> > +
> > +struct ksmbd_file {
> > + struct file *filp;
> > + char *filename;
> > + unsigned int persistent_id;
> > + unsigned int volatile_id;
> > +
> > + spinlock_t f_lock;
> > +
> > + struct ksmbd_inode *f_ci;
> > + struct ksmbd_inode *f_parent_ci;
> > + struct oplock_info __rcu *f_opinfo;
> > + struct ksmbd_conn *conn;
> > + struct ksmbd_tree_connect *tcon;
> > +
> > + atomic_t refcount;
> > + __le32 daccess;
> > + __le32 saccess;
> > + __le32 coption;
> > + __le32 cdoption;
> > + __u64 create_time;
> > + __u64 itime;
> > +
> > + bool is_durable;
> > + bool is_resilient;
> > + bool is_persistent;
> > + bool is_nt_open;
> > + bool attrib_only;
> > +
> > + char client_guid[16];
> > + char create_guid[16];
> > + char app_instance_id[16];
> > +
> > + struct stream stream;
> > + struct list_head node;
> > + struct list_head blocked_works;
> > +
> > + int durable_timeout;
> > +
> > + /* for SMB1 */
> > + int pid;
> > +
> > + /* conflict lock fail count for SMB1 */
> > + unsigned int cflock_cnt;
> > + /* last lock failure start offset for SMB1 */
> > + unsigned long long llock_fstart;
> > +
> > + int dirent_offset;
> > +
> > + /* if ls is happening on directory, below is valid*/
> > + struct ksmbd_readdir_data readdir_data;
> > + int dot_dotdot[2];
> > +};
> > +
> > +static inline void set_ctx_actor(struct dir_context *ctx,
> > + filldir_t actor)
> > +{
> > + ctx->actor = actor;
> > +}
> > +
> > +#define KSMBD_NR_OPEN_DEFAULT BITS_PER_LONG
> > +
> > +struct ksmbd_file_table {
> > + rwlock_t lock;
> > + struct idr *idr;
> > +};
> > +
> > +static inline bool HAS_FILE_ID(unsigned long long req)
> > +{
> > + unsigned int id = (unsigned int)req;
> > +
> > + return id < KSMBD_NO_FID;
> > +}
> > +
> > +static inline bool ksmbd_stream_fd(struct ksmbd_file *fp)
> > +{
> > + return fp->stream.name != NULL;
> > +}
> > +
> > +int ksmbd_init_file_table(struct ksmbd_file_table *ft);
> > +void ksmbd_destroy_file_table(struct ksmbd_file_table *ft);
> > +
> > +int ksmbd_close_fd(struct ksmbd_work *work, unsigned int id);
> > +
> > +struct ksmbd_file *ksmbd_lookup_fd_fast(struct ksmbd_work *work,
> > + unsigned int id);
> > +struct ksmbd_file *ksmbd_lookup_foreign_fd(struct ksmbd_work *work,
> > + unsigned int id);
> > +struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work,
> > + unsigned int id,
> > + unsigned int pid);
> > +
> > +void ksmbd_fd_put(struct ksmbd_work *work, struct ksmbd_file *fp);
> > +
> > +int ksmbd_close_fd_app_id(struct ksmbd_work *work, char *app_id);
> > +struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id);
> > +struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid);
> > +struct ksmbd_file *ksmbd_lookup_fd_filename(struct ksmbd_work *work,
> > + char *filename);
> > +struct ksmbd_file *ksmbd_lookup_fd_inode(struct inode *inode);
> > +
> > +unsigned int ksmbd_open_durable_fd(struct ksmbd_file *fp);
> > +
> > +struct ksmbd_file *ksmbd_open_fd(struct ksmbd_work *work,
> > + struct file *filp);
> > +
> > +void ksmbd_close_tree_conn_fds(struct ksmbd_work *work);
> > +void ksmbd_close_session_fds(struct ksmbd_work *work);
> > +
> > +int ksmbd_close_inode_fds(struct ksmbd_work *work, struct inode
> > *inode);
> > +
> > +int ksmbd_reopen_durable_fd(struct ksmbd_work *work,
> > + struct ksmbd_file *fp);
> > +
> > +int ksmbd_init_global_file_table(void);
> > +void ksmbd_free_global_file_table(void);
> > +
> > +int ksmbd_file_table_flush(struct ksmbd_work *work);
> > +
> > +void ksmbd_set_fd_limit(unsigned long limit);
> > +
> > +/*
> > + * INODE hash
> > + */
> > +
> > +int __init ksmbd_inode_hash_init(void);
> > +void __exit ksmbd_release_inode_hash(void);
> > +
> > +enum KSMBD_INODE_STATUS {
> > + KSMBD_INODE_STATUS_OK,
> > + KSMBD_INODE_STATUS_UNKNOWN,
> > + KSMBD_INODE_STATUS_PENDING_DELETE,
> > +};
> > +
> > +int ksmbd_query_inode_status(struct inode *inode);
> > +
> > +bool ksmbd_inode_pending_delete(struct ksmbd_file *fp);
> > +void ksmbd_set_inode_pending_delete(struct ksmbd_file *fp);
> > +void ksmbd_clear_inode_pending_delete(struct ksmbd_file *fp);
> > +
> > +void ksmbd_fd_set_delete_on_close(struct ksmbd_file *fp,
> > + int file_info);
> > +#endif /* __VFS_CACHE_H__ */
> > --
> > 2.17.1
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