cifsd: add file operations

This adds file operations and buffer pool for cifsd.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

1 files changed, 314 insertions, 0 deletions

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@kernel.org>
+ *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#ifndef __KSMBD_VFS_H__
+#define __KSMBD_VFS_H__
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <uapi/linux/xattr.h>
+#include <linux/posix_acl.h>
+
+#include "smbacl.h"
+
+/* STREAM XATTR PREFIX */
+#define STREAM_PREFIX			"DosStream."
+#define STREAM_PREFIX_LEN		(sizeof(STREAM_PREFIX) - 1)
+#define XATTR_NAME_STREAM		(XATTR_USER_PREFIX STREAM_PREFIX)
+#define XATTR_NAME_STREAM_LEN		(sizeof(XATTR_NAME_STREAM) - 1)
+
+enum {
+	XATTR_DOSINFO_ATTRIB		= 0x00000001,
+	XATTR_DOSINFO_EA_SIZE		= 0x00000002,
+	XATTR_DOSINFO_SIZE		= 0x00000004,
+	XATTR_DOSINFO_ALLOC_SIZE	= 0x00000008,
+	XATTR_DOSINFO_CREATE_TIME	= 0x00000010,
+	XATTR_DOSINFO_CHANGE_TIME	= 0x00000020,
+	XATTR_DOSINFO_ITIME		= 0x00000040
+};
+
+struct xattr_dos_attrib {
+	__u16	version;
+	__u32	flags;
+	__u32	attr;
+	__u32	ea_size;
+	__u64	size;
+	__u64	alloc_size;
+	__u64	create_time;
+	__u64	change_time;
+	__u64	itime;
+};
+
+/* DOS ATTRIBUITE XATTR PREFIX */
+#define DOS_ATTRIBUTE_PREFIX		"DOSATTRIB"
+#define DOS_ATTRIBUTE_PREFIX_LEN	(sizeof(DOS_ATTRIBUTE_PREFIX) - 1)
+#define XATTR_NAME_DOS_ATTRIBUTE	\
+		(XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX)
+#define XATTR_NAME_DOS_ATTRIBUTE_LEN	\
+		(sizeof(XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX) - 1)
+
+#define XATTR_SD_HASH_TYPE_SHA256	0x1
+#define XATTR_SD_HASH_SIZE		64
+
+#define SMB_ACL_READ			4
+#define SMB_ACL_WRITE			2
+#define SMB_ACL_EXECUTE			1
+
+enum {
+	SMB_ACL_TAG_INVALID = 0,
+	SMB_ACL_USER,
+	SMB_ACL_USER_OBJ,
+	SMB_ACL_GROUP,
+	SMB_ACL_GROUP_OBJ,
+	SMB_ACL_OTHER,
+	SMB_ACL_MASK
+};
+
+struct xattr_acl_entry {
+	int type;
+	uid_t uid;
+	gid_t gid;
+	mode_t perm;
+};
+
+struct xattr_smb_acl {
+	int count;
+	int next;
+	struct xattr_acl_entry entries[0];
+};
+
+struct xattr_ntacl {
+	__u16	version;
+	void	*sd_buf;
+	__u32	sd_size;
+	__u16	hash_type;
+	__u8	desc[10];
+	__u16	desc_len;
+	__u64	current_time;
+	__u8	hash[XATTR_SD_HASH_SIZE];
+	__u8	posix_acl_hash[XATTR_SD_HASH_SIZE];
+};
+
+/* SECURITY DESCRIPTOR XATTR PREFIX */
+#define SD_PREFIX			"NTACL"
+#define SD_PREFIX_LEN	(sizeof(SD_PREFIX) - 1)
+#define XATTR_NAME_SD	\
+		(XATTR_SECURITY_PREFIX SD_PREFIX)
+#define XATTR_NAME_SD_LEN	\
+		(sizeof(XATTR_SECURITY_PREFIX SD_PREFIX) - 1)
+
+
+/* CreateOptions */
+/* Flag is set, it must not be a file , valid for directory only */
+#define FILE_DIRECTORY_FILE_LE			cpu_to_le32(0x00000001)
+#define FILE_WRITE_THROUGH_LE			cpu_to_le32(0x00000002)
+#define FILE_SEQUENTIAL_ONLY_LE			cpu_to_le32(0x00000004)
+
+/* Should not buffer on server*/
+#define FILE_NO_INTERMEDIATE_BUFFERING_LE	cpu_to_le32(0x00000008)
+/* MBZ */
+#define FILE_SYNCHRONOUS_IO_ALERT_LE		cpu_to_le32(0x00000010)
+/* MBZ */
+#define FILE_SYNCHRONOUS_IO_NONALERT_LE		cpu_to_le32(0x00000020)
+
+/* Flaf must not be set for directory */
+#define FILE_NON_DIRECTORY_FILE_LE		cpu_to_le32(0x00000040)
+
+/* Should be zero */
+#define CREATE_TREE_CONNECTION			cpu_to_le32(0x00000080)
+#define FILE_COMPLETE_IF_OPLOCKED_LE		cpu_to_le32(0x00000100)
+#define FILE_NO_EA_KNOWLEDGE_LE			cpu_to_le32(0x00000200)
+#define FILE_OPEN_REMOTE_INSTANCE		cpu_to_le32(0x00000400)
+
+/**
+ * Doc says this is obsolete "open for recovery" flag should be zero
+ * in any case.
+ */
+#define CREATE_OPEN_FOR_RECOVERY		cpu_to_le32(0x00000400)
+#define FILE_RANDOM_ACCESS_LE			cpu_to_le32(0x00000800)
+#define FILE_DELETE_ON_CLOSE_LE			cpu_to_le32(0x00001000)
+#define FILE_OPEN_BY_FILE_ID_LE			cpu_to_le32(0x00002000)
+#define FILE_OPEN_FOR_BACKUP_INTENT_LE		cpu_to_le32(0x00004000)
+#define FILE_NO_COMPRESSION_LE			cpu_to_le32(0x00008000)
+
+/* Should be zero*/
+#define FILE_OPEN_REQUIRING_OPLOCK		cpu_to_le32(0x00010000)
+#define FILE_DISALLOW_EXCLUSIVE			cpu_to_le32(0x00020000)
+#define FILE_RESERVE_OPFILTER_LE		cpu_to_le32(0x00100000)
+#define FILE_OPEN_REPARSE_POINT_LE		cpu_to_le32(0x00200000)
+#define FILE_OPEN_NO_RECALL_LE			cpu_to_le32(0x00400000)
+
+/* Should be zero */
+#define FILE_OPEN_FOR_FREE_SPACE_QUERY_LE	cpu_to_le32(0x00800000)
+#define CREATE_OPTIONS_MASK			cpu_to_le32(0x00FFFFFF)
+#define CREATE_OPTION_READONLY			0x10000000
+/* system. NB not sent over wire */
+#define CREATE_OPTION_SPECIAL			0x20000000
+
+struct ksmbd_work;
+struct ksmbd_file;
+struct ksmbd_conn;
+
+struct ksmbd_dir_info {
+	const char	*name;
+	char		*wptr;
+	char		*rptr;
+	int		name_len;
+	int		out_buf_len;
+	int		num_entry;
+	int		data_count;
+	int		last_entry_offset;
+	bool		hide_dot_file;
+	int		flags;
+};
+
+struct ksmbd_readdir_data {
+	struct dir_context	ctx;
+	union {
+		void		*private;
+		char		*dirent;
+	};
+
+	unsigned int		used;
+	unsigned int		dirent_count;
+	unsigned int		file_attr;
+};
+
+/* ksmbd kstat wrapper to get valid create time when reading dir entry */
+struct ksmbd_kstat {
+	struct kstat		*kstat;
+	unsigned long long	create_time;
+	__le32			file_attributes;
+};
+
+struct ksmbd_fs_sector_size {
+	unsigned short	logical_sector_size;
+	unsigned int	physical_sector_size;
+	unsigned int	optimal_io_size;
+};
+
+int ksmbd_vfs_inode_permission(struct dentry *dentry, int acc_mode,
+		bool delete);
+int ksmbd_vfs_query_maximal_access(struct dentry *dentry, __le32 *daccess);
+int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode);
+int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode);
+int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp,
+		 size_t count, loff_t *pos);
+int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
+	char *buf, size_t count, loff_t *pos, bool sync, ssize_t *written);
+int ksmbd_vfs_fsync(struct ksmbd_work *work, uint64_t fid, uint64_t p_id);
+int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name);
+int ksmbd_vfs_link(struct ksmbd_work *work,
+		const char *oldname, const char *newname);
+int ksmbd_vfs_getattr(struct path *path, struct kstat *stat);
+int ksmbd_vfs_symlink(const char *name, const char *symname);
+int ksmbd_vfs_readlink(struct path *path, char *buf, int lenp);
+
+int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file *fp,
+		char *newname);
+int ksmbd_vfs_rename_slowpath(struct ksmbd_work *work,
+		char *oldname, char *newname);
+
+int ksmbd_vfs_truncate(struct ksmbd_work *work, const char *name,
+	struct ksmbd_file *fp, loff_t size);
+
+struct srv_copychunk;
+int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
+				struct ksmbd_file *src_fp,
+				struct ksmbd_file *dst_fp,
+				struct srv_copychunk *chunks,
+				unsigned int chunk_count,
+				unsigned int *chunk_count_written,
+				unsigned int *chunk_size_written,
+				loff_t  *total_size_written);
+
+struct ksmbd_file *ksmbd_vfs_dentry_open(struct ksmbd_work *work,
+					 const struct path *path,
+					 int flags,
+					 __le32 option,
+					 int fexist);
+
+ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list);
+ssize_t ksmbd_vfs_getxattr(struct dentry *dentry,
+			   char *xattr_name,
+			   char **xattr_buf);
+
+ssize_t ksmbd_vfs_casexattr_len(struct dentry *dentry,
+				char *attr_name,
+				int attr_name_len);
+
+int ksmbd_vfs_setxattr(struct dentry *dentry,
+		       const char *attr_name,
+		       const void *attr_value,
+		       size_t attr_size,
+		       int flags);
+
+int ksmbd_vfs_fsetxattr(const char *filename,
+			const char *attr_name,
+			const void *attr_value,
+			size_t attr_size,
+			int flags);
+
+int ksmbd_vfs_xattr_stream_name(char *stream_name,
+				char **xattr_stream_name,
+				size_t *xattr_stream_name_size,
+				int s_type);
+
+int ksmbd_vfs_truncate_xattr(struct dentry *dentry, int wo_streams);
+int ksmbd_vfs_remove_xattr(struct dentry *dentry, char *attr_name);
+void ksmbd_vfs_xattr_free(char *xattr);
+
+int ksmbd_vfs_kern_path(char *name, unsigned int flags, struct path *path,
+		bool caseless);
+int ksmbd_vfs_empty_dir(struct ksmbd_file *fp);
+void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option);
+int ksmbd_vfs_lock(struct file *filp, int cmd, struct file_lock *flock);
+int ksmbd_vfs_readdir(struct file *file, struct ksmbd_readdir_data *rdata);
+int ksmbd_vfs_alloc_size(struct ksmbd_work *work,
+			 struct ksmbd_file *fp,
+			 loff_t len);
+int ksmbd_vfs_zero_data(struct ksmbd_work *work,
+			 struct ksmbd_file *fp,
+			 loff_t off,
+			 loff_t len);
+
+struct file_allocated_range_buffer;
+int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
+			struct file_allocated_range_buffer *ranges,
+			int in_count, int *out_count);
+int ksmbd_vfs_unlink(struct dentry *dir, struct dentry *dentry);
+unsigned short ksmbd_vfs_logical_sector_size(struct inode *inode);
+void ksmbd_vfs_smb2_sector_size(struct inode *inode,
+				struct ksmbd_fs_sector_size *fs_ss);
+void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat);
+
+int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
+				struct dentry *dentry,
+				struct ksmbd_kstat *ksmbd_kstat);
+
+int ksmbd_vfs_posix_lock_wait(struct file_lock *flock);
+int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout);
+void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock);
+
+int ksmbd_vfs_remove_acl_xattrs(struct dentry *dentry);
+int ksmbd_vfs_remove_sd_xattrs(struct dentry *dentry);
+int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn, struct dentry *dentry,
+		struct smb_ntsd *pntsd, int len);
+int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn, struct dentry *dentry,
+		struct smb_ntsd **pntsd);
+int ksmbd_vfs_set_dos_attrib_xattr(struct dentry *dentry,
+		struct xattr_dos_attrib *da);
+int ksmbd_vfs_get_dos_attrib_xattr(struct dentry *dentry,
+		struct xattr_dos_attrib *da);
+struct posix_acl *ksmbd_vfs_posix_acl_alloc(int count, gfp_t flags);
+struct posix_acl *ksmbd_vfs_get_acl(struct inode *inode, int type);
+int ksmbd_vfs_set_posix_acl(struct inode *inode, int type,
+		struct posix_acl *acl);
+int ksmbd_vfs_set_init_posix_acl(struct inode *inode);
+int ksmbd_vfs_inherit_posix_acl(struct inode *inode,
+		struct inode *parent_inode);
+#endif /* __KSMBD_VFS_H__ */