C++ cifs_sb_master_tcon函数代码示例

static int
cifs_read_super(struct super_block *sb)
{
	struct inode *inode;
	struct cifs_sb_info *cifs_sb;
	int rc = 0;

	cifs_sb = CIFS_SB(sb);

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
		sb->s_flags |= MS_POSIXACL;

	if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES)
		sb->s_maxbytes = MAX_LFS_FILESIZE;
	else
		sb->s_maxbytes = MAX_NON_LFS;

	/* BB FIXME fix time_gran to be larger for LANMAN sessions */
	sb->s_time_gran = 100;

	sb->s_magic = CIFS_MAGIC_NUMBER;
	sb->s_op = &cifs_super_ops;
	sb->s_bdi = &cifs_sb->bdi;
	sb->s_blocksize = CIFS_MAX_MSGSIZE;
	sb->s_blocksize_bits = 14;	/* default 2**14 = CIFS_MAX_MSGSIZE */
	inode = cifs_root_iget(sb);

	if (IS_ERR(inode)) {
		rc = PTR_ERR(inode);
		goto out_no_root;
	}

	sb->s_root = d_make_root(inode);
	if (!sb->s_root) {
		rc = -ENOMEM;
		goto out_no_root;
	}

	/* do that *after* d_alloc_root() - we want NULL ->d_op for root here */
	if (cifs_sb_master_tcon(cifs_sb)->nocase)
		sb->s_d_op = &cifs_ci_dentry_ops;
	else
		sb->s_d_op = &cifs_dentry_ops;

#ifdef CONFIG_CIFS_NFSD_EXPORT
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
		cFYI(1, "export ops supported");
		sb->s_export_op = &cifs_export_ops;
	}
#endif /* CONFIG_CIFS_NFSD_EXPORT */

	return 0;

out_no_root:
	cERROR(1, "cifs_read_super: get root inode failed");
	return rc;
}

static int
cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	struct TCP_Server_Info *server = tcon->ses->server;
	unsigned int xid;
	int rc = 0;

	xid = get_xid();

	/*
	 * PATH_MAX may be too long - it would presumably be total path,
	 * but note that some servers (includinng Samba 3) have a shorter
	 * maximum path.
	 *
	 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
	 */
	buf->f_namelen = PATH_MAX;
	buf->f_files = 0;	/* undefined */
	buf->f_ffree = 0;	/* unlimited */

	if (server->ops->queryfs)
		rc = server->ops->queryfs(xid, tcon, buf);

	free_xid(xid);
	return 0;
}

static int
cifs_read_super(struct super_block *sb)
{
	struct inode *inode;
	struct cifs_sb_info *cifs_sb;
	struct cifs_tcon *tcon;
	int rc = 0;

	cifs_sb = CIFS_SB(sb);
	tcon = cifs_sb_master_tcon(cifs_sb);

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
		sb->s_flags |= MS_POSIXACL;

	if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
		sb->s_maxbytes = MAX_LFS_FILESIZE;
	else
		sb->s_maxbytes = MAX_NON_LFS;

	/* BB FIXME fix time_gran to be larger for LANMAN sessions */
	sb->s_time_gran = 100;

	sb->s_magic = CIFS_MAGIC_NUMBER;
	sb->s_op = &cifs_super_ops;
	sb->s_xattr = cifs_xattr_handlers;
	sb->s_bdi = &cifs_sb->bdi;
	sb->s_blocksize = CIFS_MAX_MSGSIZE;
	sb->s_blocksize_bits = 14;	/* default 2**14 = CIFS_MAX_MSGSIZE */
	inode = cifs_root_iget(sb);

	if (IS_ERR(inode)) {
		rc = PTR_ERR(inode);
		goto out_no_root;
	}

	if (tcon->nocase)
		sb->s_d_op = &cifs_ci_dentry_ops;
	else
		sb->s_d_op = &cifs_dentry_ops;

	sb->s_root = d_make_root(inode);
	if (!sb->s_root) {
		rc = -ENOMEM;
		goto out_no_root;
	}

#ifdef CONFIG_CIFS_NFSD_EXPORT
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
		cifs_dbg(FYI, "export ops supported\n");
		sb->s_export_op = &cifs_export_ops;
	}
#endif /* CONFIG_CIFS_NFSD_EXPORT */

	return 0;

out_no_root:
	cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
	return rc;
}

/*
 * Is it possible that this directory might turn out to be a DFS referral
 * once we go to try and use it?
 */
static bool
cifs_dfs_is_possible(struct cifs_sb_info *cifs_sb)
{
#ifdef CONFIG_CIFS_DFS_UPCALL
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);

	if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
		return true;
#endif
	return false;
}

static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
{
	struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	struct TCP_Server_Info *server = tcon->ses->server;

	if (server->ops->fallocate)
		return server->ops->fallocate(file, tcon, mode, off, len);

	return -EOPNOTSUPP;
}

static void cifs_fscache_enable_inode_cookie(struct inode *inode)
{
	struct cifsInodeInfo *cifsi = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);

	if (cifsi->fscache)
		return;

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) {
		cifsi->fscache = fscache_acquire_cookie(tcon->fscache,
				&cifs_fscache_inode_object_def, cifsi);
		cFYI(1, "CIFS: got FH cookie (0x%p/0x%p)", tcon->fscache,
				cifsi->fscache);
	}
}

void cifs_fscache_reset_inode_cookie(struct inode *inode)
{
	struct cifsInodeInfo *cifsi = CIFS_I(inode);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct fscache_cookie *old = cifsi->fscache;

	if (cifsi->fscache) {
		/* retire the current fscache cache and get a new one */
		fscache_relinquish_cookie(cifsi->fscache, 1);

		cifsi->fscache = fscache_acquire_cookie(
					cifs_sb_master_tcon(cifs_sb)->fscache,
					&cifs_fscache_inode_object_def,
					cifsi);
		cFYI(1, "CIFS: new cookie 0x%p oldcookie 0x%p",
				cifsi->fscache, old);
	}
}

static void
cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
		       struct cifs_sb_info *cifs_sb)
{
	int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;

	memset(fattr, 0, sizeof(*fattr));
	fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
					    info->LastAccessTime, offset);
	fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
					    info->LastWriteTime, offset);
	fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
					    info->LastWriteTime, offset);

	fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
	fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
	fattr->cf_eof = le32_to_cpu(info->DataSize);

	cifs_fill_common_info(fattr, cifs_sb);
}

static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
				  unsigned long p)
{
	struct inode *inode = file_inode(filep);
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	struct dentry *dentry = filep->f_path.dentry;
	unsigned char *path;
	__le16 *utf16_path = NULL, root_path;
	int rc = 0;

	path = build_path_from_dentry(dentry);
	if (path == NULL)
		return -ENOMEM;

	cifs_dbg(FYI, "%s %s\n", __func__, path);

	if (!path[0]) {
		root_path = 0;
		utf16_path = &root_path;
	} else {
		utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
		if (!utf16_path) {
			rc = -ENOMEM;
			goto ici_exit;
		}
	}

	if (tcon->ses->server->ops->ioctl_query_info)
		rc = tcon->ses->server->ops->ioctl_query_info(
				xid, tcon, utf16_path,
				filep->private_data ? 0 : 1, p);
	else
		rc = -EOPNOTSUPP;

 ici_exit:
	if (utf16_path != &root_path)
		kfree(utf16_path);
	kfree(path);
	return rc;
}

/* Note: caller must free return buffer */
char *
build_path_from_dentry(struct dentry *direntry)
{
	struct dentry *temp;
	int namelen;
	int dfsplen;
	int pplen = 0;
	char *full_path;
	char dirsep;
	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	unsigned seq;

	dirsep = CIFS_DIR_SEP(cifs_sb);
	if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
		dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
	else
		dfsplen = 0;

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
		pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;

cifs_bp_rename_retry:
	namelen = dfsplen + pplen;
	seq = read_seqbegin(&rename_lock);
	rcu_read_lock();
	for (temp = direntry; !IS_ROOT(temp);) {
		namelen += (1 + temp->d_name.len);
		temp = temp->d_parent;
		if (temp == NULL) {
			cifs_dbg(VFS, "corrupt dentry\n");
			rcu_read_unlock();
			return NULL;
		}
	}
	rcu_read_unlock();

	full_path = kmalloc(namelen+1, GFP_KERNEL);
	if (full_path == NULL)
		return full_path;
	full_path[namelen] = 0;	/* trailing null */
	rcu_read_lock();
	for (temp = direntry; !IS_ROOT(temp);) {
		spin_lock(&temp->d_lock);
		namelen -= 1 + temp->d_name.len;
		if (namelen < 0) {
			spin_unlock(&temp->d_lock);
			break;
		} else {
			full_path[namelen] = dirsep;
			strncpy(full_path + namelen + 1, temp->d_name.name,
				temp->d_name.len);
			cifs_dbg(FYI, "name: %s\n", full_path + namelen);
		}
		spin_unlock(&temp->d_lock);
		temp = temp->d_parent;
		if (temp == NULL) {
			cifs_dbg(VFS, "corrupt dentry\n");
			rcu_read_unlock();
			kfree(full_path);
			return NULL;
		}
	}
	rcu_read_unlock();
	if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) {
		cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
			 namelen, dfsplen);
		/* presumably this is only possible if racing with a rename
		of one of the parent directories  (we can not lock the dentries
		above us to prevent this, but retrying should be harmless) */
		kfree(full_path);
		goto cifs_bp_rename_retry;
	}
	/* DIR_SEP already set for byte  0 / vs \ but not for
	   subsequent slashes in prepath which currently must
	   be entered the right way - not sure if there is an alternative
	   since the '\' is a valid posix character so we can not switch
	   those safely to '/' if any are found in the middle of the prepath */
	/* BB test paths to Windows with '/' in the midst of prepath */

	if (pplen) {
		int i;

		cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
		memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1);
		full_path[dfsplen] = '\\';
		for (i = 0; i < pplen-1; i++)
			if (full_path[dfsplen+1+i] == '/')
				full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb);
	}

	if (dfsplen) {
		strncpy(full_path, tcon->treeName, dfsplen);
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
			int i;
			for (i = 0; i < dfsplen; i++) {
				if (full_path[i] == '\\')
					full_path[i] = '/';
			}
//.........这里部分代码省略.........

static int
cifs_read_super(struct super_block *sb, void *data,
                const char *devname, int silent)
{
    struct inode *inode;
    struct cifs_sb_info *cifs_sb;
    int rc = 0;

    /* BB should we make this contingent on mount parm? */
    sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
    sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
    cifs_sb = CIFS_SB(sb);
    if (cifs_sb == NULL)
        return -ENOMEM;

    spin_lock_init(&cifs_sb->tlink_tree_lock);
    cifs_sb->tlink_tree = RB_ROOT;

    rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
    if (rc) {
        kfree(cifs_sb);
        return rc;
    }
    cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;

#ifdef CONFIG_CIFS_DFS_UPCALL
    /* copy mount params to sb for use in submounts */
    /* BB: should we move this after the mount so we
     * do not have to do the copy on failed mounts?
     * BB: May be it is better to do simple copy before
     * complex operation (mount), and in case of fail
     * just exit instead of doing mount and attempting
     * undo it if this copy fails?*/
    if (data) {
        int len = strlen(data);
        cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
        if (cifs_sb->mountdata == NULL) {
            bdi_destroy(&cifs_sb->bdi);
            kfree(sb->s_fs_info);
            sb->s_fs_info = NULL;
            return -ENOMEM;
        }
        strncpy(cifs_sb->mountdata, data, len + 1);
        cifs_sb->mountdata[len] = '\0';
    }
#endif

    rc = cifs_mount(sb, cifs_sb, data, devname);

    if (rc) {
        if (!silent)
            cERROR(1, "cifs_mount failed w/return code = %d", rc);
        goto out_mount_failed;
    }

    sb->s_magic = CIFS_MAGIC_NUMBER;
    sb->s_op = &cifs_super_ops;
    sb->s_bdi = &cifs_sb->bdi;
    sb->s_blocksize = CIFS_MAX_MSGSIZE;
    sb->s_blocksize_bits = 14;	/* default 2**14 = CIFS_MAX_MSGSIZE */
    inode = cifs_root_iget(sb, ROOT_I);

    if (IS_ERR(inode)) {
        rc = PTR_ERR(inode);
        inode = NULL;
        goto out_no_root;
    }

    sb->s_root = d_alloc_root(inode);

    if (!sb->s_root) {
        rc = -ENOMEM;
        goto out_no_root;
    }

    /* do that *after* d_alloc_root() - we want NULL ->d_op for root here */
    if (cifs_sb_master_tcon(cifs_sb)->nocase)
        sb->s_d_op = &cifs_ci_dentry_ops;
    else
        sb->s_d_op = &cifs_dentry_ops;

#ifdef CONFIG_CIFS_EXPERIMENTAL
    if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
        cFYI(1, "export ops supported");
        sb->s_export_op = &cifs_export_ops;
    }
#endif /* EXPERIMENTAL */

    return 0;

out_no_root:
    cERROR(1, "cifs_read_super: get root inode failed");
    if (inode)
        iput(inode);

    cifs_umount(sb, cifs_sb);

out_mount_failed:
    if (cifs_sb) {
#ifdef CONFIG_CIFS_DFS_UPCALL
//.........这里部分代码省略.........

/* Note: caller must free return buffer */
char *
build_path_from_dentry(struct dentry *direntry)
{
	struct dentry *temp;
	int namelen;
	int dfsplen;
	char *full_path;
	char dirsep;
	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);

	if (direntry == NULL)
		return NULL;  /* not much we can do if dentry is freed and
		we need to reopen the file after it was closed implicitly
		when the server crashed */

	dirsep = CIFS_DIR_SEP(cifs_sb);
	if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
		dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
	else
		dfsplen = 0;
cifs_bp_rename_retry:
	namelen = dfsplen;
	for (temp = direntry; !IS_ROOT(temp);) {
		namelen += (1 + temp->d_name.len);
		temp = temp->d_parent;
		if (temp == NULL) {
			cERROR(1, "corrupt dentry");
			return NULL;
		}
	}

	full_path = kmalloc(namelen+1, GFP_KERNEL);
	if (full_path == NULL)
		return full_path;
	full_path[namelen] = 0;	/* trailing null */
	for (temp = direntry; !IS_ROOT(temp);) {
		namelen -= 1 + temp->d_name.len;
		if (namelen < 0) {
			break;
		} else {
			full_path[namelen] = dirsep;
			strncpy(full_path + namelen + 1, temp->d_name.name,
				temp->d_name.len);
			cFYI(0, "name: %s", full_path + namelen);
		}
		temp = temp->d_parent;
		if (temp == NULL) {
			cERROR(1, "corrupt dentry");
			kfree(full_path);
			return NULL;
		}
	}
	if (namelen != dfsplen) {
		cERROR(1, "did not end path lookup where expected namelen is %d",
			namelen);
		/* presumably this is only possible if racing with a rename
		of one of the parent directories  (we can not lock the dentries
		above us to prevent this, but retrying should be harmless) */
		kfree(full_path);
		goto cifs_bp_rename_retry;
	}
	/* DIR_SEP already set for byte  0 / vs \ but not for
	   subsequent slashes in prepath which currently must
	   be entered the right way - not sure if there is an alternative
	   since the '\' is a valid posix character so we can not switch
	   those safely to '/' if any are found in the middle of the prepath */
	/* BB test paths to Windows with '/' in the midst of prepath */

	if (dfsplen) {
		strncpy(full_path, tcon->treeName, dfsplen);
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
			int i;
			for (i = 0; i < dfsplen; i++) {
				if (full_path[i] == '\\')
					full_path[i] = '/';
			}
		}
	}
	return full_path;
}

		direntry = direntry->d_parent;
	} while (!IS_ROOT(direntry));
}

/* Note: caller must free return buffer */
char *
build_path_from_dentry(struct dentry *direntry)
{
	struct dentry *temp;
	int namelen;
<<<<<<< HEAD
	int dfsplen;
	char *full_path;
	char dirsep;
	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	unsigned seq;
=======
	int pplen;
	int dfsplen;
	char *full_path;
	char dirsep;
	struct cifs_sb_info *cifs_sb;
>>>>>>> 296c66da8a02d52243f45b80521febece5ed498a

	if (direntry == NULL)
		return NULL;  /* not much we can do if dentry is freed and
		we need to reopen the file after it was closed implicitly
		when the server crashed */

<<<<<<< HEAD

/*
 * cifs_show_options() is for displaying mount options in /proc/mounts.
 * Not all settable options are displayed but most of the important
 * ones are.
 */
static int
cifs_show_options(struct seq_file *s, struct dentry *root)
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	struct sockaddr *srcaddr;
	srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;

	seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
	cifs_show_security(s, tcon->ses);
	cifs_show_cache_flavor(s, cifs_sb);

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
		seq_puts(s, ",multiuser");
	else if (tcon->ses->user_name)
		seq_printf(s, ",username=%s", tcon->ses->user_name);

	if (tcon->ses->domainName)
		seq_printf(s, ",domain=%s", tcon->ses->domainName);

	if (srcaddr->sa_family != AF_UNSPEC) {
		struct sockaddr_in *saddr4;
		struct sockaddr_in6 *saddr6;
		saddr4 = (struct sockaddr_in *)srcaddr;
		saddr6 = (struct sockaddr_in6 *)srcaddr;
		if (srcaddr->sa_family == AF_INET6)
			seq_printf(s, ",srcaddr=%pI6c",
				   &saddr6->sin6_addr);
		else if (srcaddr->sa_family == AF_INET)
			seq_printf(s, ",srcaddr=%pI4",
				   &saddr4->sin_addr.s_addr);
		else
			seq_printf(s, ",srcaddr=BAD-AF:%i",
				   (int)(srcaddr->sa_family));
	}

	seq_printf(s, ",uid=%u",
		   from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
		seq_puts(s, ",forceuid");
	else
		seq_puts(s, ",noforceuid");

	seq_printf(s, ",gid=%u",
		   from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
		seq_puts(s, ",forcegid");
	else
		seq_puts(s, ",noforcegid");

	cifs_show_address(s, tcon->ses->server);

	if (!tcon->unix_ext)
		seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
					   cifs_sb->mnt_file_mode,
					   cifs_sb->mnt_dir_mode);

	cifs_show_nls(s, cifs_sb->local_nls);

	if (tcon->seal)
		seq_puts(s, ",seal");
	if (tcon->nocase)
		seq_puts(s, ",nocase");
	if (tcon->retry)
		seq_puts(s, ",hard");
	if (tcon->unix_ext)
		seq_puts(s, ",unix");
	else
		seq_puts(s, ",nounix");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
		seq_puts(s, ",posixpaths");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
		seq_puts(s, ",setuids");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
		seq_puts(s, ",serverino");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
		seq_puts(s, ",rwpidforward");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
		seq_puts(s, ",forcemand");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
		seq_puts(s, ",nouser_xattr");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
		seq_puts(s, ",mapchars");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
		seq_puts(s, ",mapposix");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
		seq_puts(s, ",sfu");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
		seq_puts(s, ",nobrl");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
		seq_puts(s, ",cifsacl");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
		seq_puts(s, ",dynperm");
	if (root->d_sb->s_flags & MS_POSIXACL)
		seq_puts(s, ",acl");
//.........这里部分代码省略.........