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linux/fs/cifs/cifsglob.h
Steve French e3e9463414 smb3: improve SMB3 change notification support 
Change notification is a commonly supported feature by most servers,
but the current ioctl to request notification when a directory is
changed does not return the information about what changed
(even though it is returned by the server in the SMB3 change
notify response), it simply returns when there is a change.

This ioctl improves upon CIFS_IOC_NOTIFY by returning the notify
information structure which includes the name of the file(s) that
changed and why. See MS-SMB2 2.2.35 for details on the individual
filter flags and the file_notify_information structure returned.

To use this simply pass in the following (with enough space
to fit at least one file_notify_information structure)

struct __attribute__((__packed__)) smb3_notify {
       uint32_t completion_filter;
       bool     watch_tree;
       uint32_t data_len;
       uint8_t  data[];
} __packed;

using CIFS_IOC_NOTIFY_INFO 0xc009cf0b
 or equivalently _IOWR(CIFS_IOCTL_MAGIC, 11, struct smb3_notify_info)

The ioctl will block until the server detects a change to that
directory or its subdirectories (if watch_tree is set).

Acked-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
2022-10-15 10:05:53 -05:00

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/* SPDX-License-Identifier: LGPL-2.1 */
/*
*
* Copyright (C) International Business Machines Corp., 2002,2008
* Author(s): Steve French (sfrench@us.ibm.com)
* Jeremy Allison (jra@samba.org)
*
*/
#ifndef _CIFS_GLOB_H
#define _CIFS_GLOB_H
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/inet.h>
#include <linux/slab.h>
#include <linux/mempool.h>
#include <linux/workqueue.h>
#include <linux/utsname.h>
#include <linux/sched/mm.h>
#include <linux/netfs.h>
#include "cifs_fs_sb.h"
#include "cifsacl.h"
#include <crypto/internal/hash.h>
#include <linux/scatterlist.h>
#include <uapi/linux/cifs/cifs_mount.h>
#include "../smbfs_common/smb2pdu.h"
#include "smb2pdu.h"
#define SMB_PATH_MAX 260
#define CIFS_PORT 445
#define RFC1001_PORT 139
/*
* The sizes of various internal tables and strings
*/
#define MAX_UID_INFO 16
#define MAX_SES_INFO 2
#define MAX_TCON_INFO 4
#define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
#define CIFS_MIN_RCV_POOL 4
#define MAX_REOPEN_ATT 5 /* these many maximum attempts to reopen a file */
/*
* default attribute cache timeout (jiffies)
*/
#define CIFS_DEF_ACTIMEO (1 * HZ)
/*
* max attribute cache timeout (jiffies) - 2^30
*/
#define CIFS_MAX_ACTIMEO (1 << 30)
/*
* Max persistent and resilient handle timeout (milliseconds).
* Windows durable max was 960000 (16 minutes)
*/
#define SMB3_MAX_HANDLE_TIMEOUT 960000
/*
* MAX_REQ is the maximum number of requests that WE will send
* on one socket concurrently.
*/
#define CIFS_MAX_REQ 32767
#define RFC1001_NAME_LEN 15
#define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
/* maximum length of ip addr as a string (including ipv6 and sctp) */
#define SERVER_NAME_LENGTH 80
#define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1)
/* echo interval in seconds */
#define SMB_ECHO_INTERVAL_MIN 1
#define SMB_ECHO_INTERVAL_MAX 600
#define SMB_ECHO_INTERVAL_DEFAULT 60
/* dns resolution intervals in seconds */
#define SMB_DNS_RESOLVE_INTERVAL_MIN 120
#define SMB_DNS_RESOLVE_INTERVAL_DEFAULT 600
/* smb multichannel query server interfaces interval in seconds */
#define SMB_INTERFACE_POLL_INTERVAL 600
/* maximum number of PDUs in one compound */
#define MAX_COMPOUND 5
/*
* Default number of credits to keep available for SMB3.
* This value is chosen somewhat arbitrarily. The Windows client
* defaults to 128 credits, the Windows server allows clients up to
* 512 credits (or 8K for later versions), and the NetApp server
* does not limit clients at all. Choose a high enough default value
* such that the client shouldn't limit performance, but allow mount
* to override (until you approach 64K, where we limit credits to 65000
* to reduce possibility of seeing more server credit overflow bugs.
*/
#define SMB2_MAX_CREDITS_AVAILABLE 32000
#include "cifspdu.h"
#ifndef XATTR_DOS_ATTRIB
#define XATTR_DOS_ATTRIB "user.DOSATTRIB"
#endif
#define CIFS_MAX_WORKSTATION_LEN (__NEW_UTS_LEN + 1) /* reasonable max for client */
/*
* CIFS vfs client Status information (based on what we know.)
*/
/* associated with each connection */
enum statusEnum {
CifsNew = 0,
CifsGood,
CifsExiting,
CifsNeedReconnect,
CifsNeedNegotiate,
CifsInNegotiate,
};
/* associated with each smb session */
enum ses_status_enum {
SES_NEW = 0,
SES_GOOD,
SES_EXITING,
SES_NEED_RECON,
SES_IN_SETUP
};
/* associated with each tree connection to the server */
enum tid_status_enum {
TID_NEW = 0,
TID_GOOD,
TID_EXITING,
TID_NEED_RECON,
TID_NEED_TCON,
TID_IN_TCON,
TID_NEED_FILES_INVALIDATE, /* currently unused */
TID_IN_FILES_INVALIDATE
};
enum securityEnum {
Unspecified = 0, /* not specified */
NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */
RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */
Kerberos, /* Kerberos via SPNEGO */
};
struct session_key {
unsigned int len;
char *response;
};
/* crypto hashing related structure/fields, not specific to a sec mech */
struct cifs_secmech {
struct shash_desc *hmacmd5; /* hmacmd5 hash function, for NTLMv2/CR1 hashes */
struct shash_desc *md5; /* md5 hash function, for CIFS/SMB1 signatures */
struct shash_desc *hmacsha256; /* hmac-sha256 hash function, for SMB2 signatures */
struct shash_desc *sha512; /* sha512 hash function, for SMB3.1.1 preauth hash */
struct shash_desc *aes_cmac; /* block-cipher based MAC function, for SMB3 signatures */
struct crypto_aead *enc; /* smb3 encryption AEAD TFM (AES-CCM and AES-GCM) */
struct crypto_aead *dec; /* smb3 decryption AEAD TFM (AES-CCM and AES-GCM) */
};
/* per smb session structure/fields */
struct ntlmssp_auth {
bool sesskey_per_smbsess; /* whether session key is per smb session */
__u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
__u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
};
struct cifs_cred {
int uid;
int gid;
int mode;
int cecount;
struct cifs_sid osid;
struct cifs_sid gsid;
struct cifs_ntace *ntaces;
struct cifs_ace *aces;
};
struct cifs_open_info_data {
char *symlink_target;
union {
struct smb2_file_all_info fi;
struct smb311_posix_qinfo posix_fi;
};
};
static inline void cifs_free_open_info(struct cifs_open_info_data *data)
{
kfree(data->symlink_target);
}
/*
*****************************************************************
* Except the CIFS PDUs themselves all the
* globally interesting structs should go here
*****************************************************************
*/
/*
* A smb_rqst represents a complete request to be issued to a server. It's
* formed by a kvec array, followed by an array of pages. Page data is assumed
* to start at the beginning of the first page.
*/
struct smb_rqst {
struct kvec *rq_iov; /* array of kvecs */
unsigned int rq_nvec; /* number of kvecs in array */
struct page **rq_pages; /* pointer to array of page ptrs */
unsigned int rq_offset; /* the offset to the 1st page */
unsigned int rq_npages; /* number pages in array */
unsigned int rq_pagesz; /* page size to use */
unsigned int rq_tailsz; /* length of last page */
};
struct mid_q_entry;
struct TCP_Server_Info;
struct cifsFileInfo;
struct cifs_ses;
struct cifs_tcon;
struct dfs_info3_param;
struct cifs_fattr;
struct smb3_fs_context;
struct cifs_fid;
struct cifs_readdata;
struct cifs_writedata;
struct cifs_io_parms;
struct cifs_search_info;
struct cifsInodeInfo;
struct cifs_open_parms;
struct cifs_credits;
struct smb_version_operations {
int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
struct mid_q_entry *);
bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
/* setup request: allocate mid, sign message */
struct mid_q_entry *(*setup_request)(struct cifs_ses *,
struct TCP_Server_Info *,
struct smb_rqst *);
/* setup async request: allocate mid, sign message */
struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
struct smb_rqst *);
/* check response: verify signature, map error */
int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
bool);
void (*add_credits)(struct TCP_Server_Info *server,
const struct cifs_credits *credits,
const int optype);
void (*set_credits)(struct TCP_Server_Info *, const int);
int * (*get_credits_field)(struct TCP_Server_Info *, const int);
unsigned int (*get_credits)(struct mid_q_entry *);
__u64 (*get_next_mid)(struct TCP_Server_Info *);
void (*revert_current_mid)(struct TCP_Server_Info *server,
const unsigned int val);
/* data offset from read response message */
unsigned int (*read_data_offset)(char *);
/*
* Data length from read response message
* When in_remaining is true, the returned data length is in
* message field DataRemaining for out-of-band data read (e.g through
* Memory Registration RDMA write in SMBD).
* Otherwise, the returned data length is in message field DataLength.
*/
unsigned int (*read_data_length)(char *, bool in_remaining);
/* map smb to linux error */
int (*map_error)(char *, bool);
/* find mid corresponding to the response message */
struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info);
void (*clear_stats)(struct cifs_tcon *);
void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
/* verify the message */
int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *);
void (*downgrade_oplock)(struct TCP_Server_Info *server,
struct cifsInodeInfo *cinode, __u32 oplock,
unsigned int epoch, bool *purge_cache);
/* process transaction2 response */
bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
char *, int);
/* check if we need to negotiate */
bool (*need_neg)(struct TCP_Server_Info *);
/* negotiate to the server */
int (*negotiate)(const unsigned int xid,
struct cifs_ses *ses,
struct TCP_Server_Info *server);
/* set negotiated write size */
unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
/* set negotiated read size */
unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
/* setup smb sessionn */
int (*sess_setup)(const unsigned int, struct cifs_ses *,
struct TCP_Server_Info *server,
const struct nls_table *);
/* close smb session */
int (*logoff)(const unsigned int, struct cifs_ses *);
/* connect to a server share */
int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
struct cifs_tcon *, const struct nls_table *);
/* close tree connecion */
int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
/* get DFS referrals */
int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
const char *, struct dfs_info3_param **,
unsigned int *, const struct nls_table *, int);
/* informational QFS call */
void (*qfs_tcon)(const unsigned int, struct cifs_tcon *,
struct cifs_sb_info *);
/* check if a path is accessible or not */
int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, const char *);
/* query path data from the server */
int (*query_path_info)(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *full_path,
struct cifs_open_info_data *data, bool *adjust_tz, bool *reparse);
/* query file data from the server */
int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon,
struct cifsFileInfo *cfile, struct cifs_open_info_data *data);
/* query reparse tag from srv to determine which type of special file */
int (*query_reparse_tag)(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *path,
__u32 *reparse_tag);
/* get server index number */
int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid,
struct cifs_open_info_data *data);
/* set size by path */
int (*set_path_size)(const unsigned int, struct cifs_tcon *,
const char *, __u64, struct cifs_sb_info *, bool);
/* set size by file handle */
int (*set_file_size)(const unsigned int, struct cifs_tcon *,
struct cifsFileInfo *, __u64, bool);
/* set attributes */
int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
const unsigned int);
int (*set_compression)(const unsigned int, struct cifs_tcon *,
struct cifsFileInfo *);
/* check if we can send an echo or nor */
bool (*can_echo)(struct TCP_Server_Info *);
/* send echo request */
int (*echo)(struct TCP_Server_Info *);
/* create directory */
int (*posix_mkdir)(const unsigned int xid, struct inode *inode,
umode_t mode, struct cifs_tcon *tcon,
const char *full_path,
struct cifs_sb_info *cifs_sb);
int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode,
struct cifs_tcon *tcon, const char *name,
struct cifs_sb_info *sb);
/* set info on created directory */
void (*mkdir_setinfo)(struct inode *, const char *,
struct cifs_sb_info *, struct cifs_tcon *,
const unsigned int);
/* remove directory */
int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
struct cifs_sb_info *);
/* unlink file */
int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
struct cifs_sb_info *);
/* open, rename and delete file */
int (*rename_pending_delete)(const char *, struct dentry *,
const unsigned int);
/* send rename request */
int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
const char *, struct cifs_sb_info *);
/* send create hardlink request */
int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
const char *, const char *,
struct cifs_sb_info *);
/* query symlink target */
int (*query_symlink)(const unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, const char *,
char **, bool);
/* open a file for non-posix mounts */
int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock,
void *buf);
/* set fid protocol-specific info */
void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
/* close a file */
void (*close)(const unsigned int, struct cifs_tcon *,
struct cifs_fid *);
/* close a file, returning file attributes and timestamps */
void (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon,
struct cifsFileInfo *pfile_info);
/* send a flush request to the server */
int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
/* async read from the server */
int (*async_readv)(struct cifs_readdata *);
/* async write to the server */
int (*async_writev)(struct cifs_writedata *,
void (*release)(struct kref *));
/* sync read from the server */
int (*sync_read)(const unsigned int, struct cifs_fid *,
struct cifs_io_parms *, unsigned int *, char **,
int *);
/* sync write to the server */
int (*sync_write)(const unsigned int, struct cifs_fid *,
struct cifs_io_parms *, unsigned int *, struct kvec *,
unsigned long);
/* open dir, start readdir */
int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
const char *, struct cifs_sb_info *,
struct cifs_fid *, __u16,
struct cifs_search_info *);
/* continue readdir */
int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
struct cifs_fid *,
__u16, struct cifs_search_info *srch_inf);
/* close dir */
int (*close_dir)(const unsigned int, struct cifs_tcon *,
struct cifs_fid *);
/* calculate a size of SMB message */
unsigned int (*calc_smb_size)(void *buf);
/* check for STATUS_PENDING and process the response if yes */
bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server);
/* check for STATUS_NETWORK_SESSION_EXPIRED */
bool (*is_session_expired)(char *);
/* send oplock break response */
int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
struct cifsInodeInfo *);
/* query remote filesystem */
int (*queryfs)(const unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, struct kstatfs *);
/* send mandatory brlock to the server */
int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
__u64, __u32, int, int, bool);
/* unlock range of mandatory locks */
int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
const unsigned int);
/* push brlocks from the cache to the server */
int (*push_mand_locks)(struct cifsFileInfo *);
/* get lease key of the inode */
void (*get_lease_key)(struct inode *, struct cifs_fid *);
/* set lease key of the inode */
void (*set_lease_key)(struct inode *, struct cifs_fid *);
/* generate new lease key */
void (*new_lease_key)(struct cifs_fid *);
int (*generate_signingkey)(struct cifs_ses *ses,
struct TCP_Server_Info *server);
int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *,
bool allocate_crypto);
int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
struct cifsFileInfo *src_file);
int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
struct cifsFileInfo *src_file, void __user *);
int (*notify)(const unsigned int xid, struct file *pfile,
void __user *pbuf, bool return_changes);
int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, const unsigned char *,
char *, unsigned int *);
int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, const unsigned char *,
char *, unsigned int *);
/* if we can do cache read operations */
bool (*is_read_op)(__u32);
/* set oplock level for the inode */
void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
bool *);
/* create lease context buffer for CREATE request */
char * (*create_lease_buf)(u8 *lease_key, u8 oplock);
/* parse lease context buffer and return oplock/epoch info */
__u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
ssize_t (*copychunk_range)(const unsigned int,
struct cifsFileInfo *src_file,
struct cifsFileInfo *target_file,
u64 src_off, u64 len, u64 dest_off);
int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
struct cifsFileInfo *target_file, u64 src_off, u64 len,
u64 dest_off);
int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
const unsigned char *, const unsigned char *, char *,
size_t, struct cifs_sb_info *);
int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
const char *, const void *, const __u16,
const struct nls_table *, struct cifs_sb_info *);
struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
const char *, u32 *, u32);
struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
const struct cifs_fid *, u32 *, u32);
int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
int);
/* writepages retry size */
unsigned int (*wp_retry_size)(struct inode *);
/* get mtu credits */
int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
unsigned int *, struct cifs_credits *);
/* adjust previously taken mtu credits to request size */
int (*adjust_credits)(struct TCP_Server_Info *server,
struct cifs_credits *credits,
const unsigned int payload_size);
/* check if we need to issue closedir */
bool (*dir_needs_close)(struct cifsFileInfo *);
long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
loff_t);
/* init transform request - used for encryption for now */
int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst,
struct smb_rqst *, struct smb_rqst *);
int (*is_transform_hdr)(void *buf);
int (*receive_transform)(struct TCP_Server_Info *,
struct mid_q_entry **, char **, int *);
enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
enum securityEnum);
int (*next_header)(char *);
/* ioctl passthrough for query_info */
int (*ioctl_query_info)(const unsigned int xid,
struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
__le16 *path, int is_dir,
unsigned long p);
/* make unix special files (block, char, fifo, socket) */
int (*make_node)(unsigned int xid,
struct inode *inode,
struct dentry *dentry,
struct cifs_tcon *tcon,
const char *full_path,
umode_t mode,
dev_t device_number);
/* version specific fiemap implementation */
int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *,
struct fiemap_extent_info *, u64, u64);
/* version specific llseek implementation */
loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int);
/* Check for STATUS_IO_TIMEOUT */
bool (*is_status_io_timeout)(char *buf);
/* Check for STATUS_NETWORK_NAME_DELETED */
void (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv);
};
struct smb_version_values {
char *version_string;
__u16 protocol_id;
__u32 req_capabilities;
__u32 large_lock_type;
__u32 exclusive_lock_type;
__u32 shared_lock_type;
__u32 unlock_lock_type;
size_t header_preamble_size;
size_t header_size;
size_t max_header_size;
size_t read_rsp_size;
__le16 lock_cmd;
unsigned int cap_unix;
unsigned int cap_nt_find;
unsigned int cap_large_files;
__u16 signing_enabled;
__u16 signing_required;
size_t create_lease_size;
};
#define HEADER_SIZE(server) (server->vals->header_size)
#define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
#define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size)
#define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server))
/**
* CIFS superblock mount flags (mnt_cifs_flags) to consider when
* trying to reuse existing superblock for a new mount
*/
#define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
CIFS_MOUNT_MAP_SFM_CHR | \
CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \
CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \
CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE)
/**
* Generic VFS superblock mount flags (s_flags) to consider when
* trying to reuse existing superblock for a new mount
*/
#define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
SB_NODEV | SB_SYNCHRONOUS)
struct cifs_mnt_data {
struct cifs_sb_info *cifs_sb;
struct smb3_fs_context *ctx;
int flags;
};
static inline unsigned int
get_rfc1002_length(void *buf)
{
return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
}
static inline void
inc_rfc1001_len(void *buf, int count)
{
be32_add_cpu((__be32 *)buf, count);
}
struct TCP_Server_Info {
struct list_head tcp_ses_list;
struct list_head smb_ses_list;
spinlock_t srv_lock; /* protect anything here that is not protected */
__u64 conn_id; /* connection identifier (useful for debugging) */
int srv_count; /* reference counter */
/* 15 character server name + 0x20 16th byte indicating type = srv */
char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
struct smb_version_operations *ops;
struct smb_version_values *vals;
/* updates to tcpStatus protected by cifs_tcp_ses_lock */
enum statusEnum tcpStatus; /* what we think the status is */
char *hostname; /* hostname portion of UNC string */
struct socket *ssocket;
struct sockaddr_storage dstaddr;
struct sockaddr_storage srcaddr; /* locally bind to this IP */
#ifdef CONFIG_NET_NS
struct net *net;
#endif
wait_queue_head_t response_q;
wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
spinlock_t mid_lock; /* protect mid queue and it's entries */
struct list_head pending_mid_q;
bool noblocksnd; /* use blocking sendmsg */
bool noautotune; /* do not autotune send buf sizes */
bool nosharesock;
bool tcp_nodelay;
unsigned int credits; /* send no more requests at once */
unsigned int max_credits; /* can override large 32000 default at mnt */
unsigned int in_flight; /* number of requests on the wire to server */
unsigned int max_in_flight; /* max number of requests that were on wire */
spinlock_t req_lock; /* protect the two values above */
struct mutex _srv_mutex;
unsigned int nofs_flag;
struct task_struct *tsk;
char server_GUID[16];
__u16 sec_mode;
bool sign; /* is signing enabled on this connection? */
bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */
bool session_estab; /* mark when very first sess is established */
int echo_credits; /* echo reserved slots */
int oplock_credits; /* oplock break reserved slots */
bool echoes:1; /* enable echoes */
__u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
u16 dialect; /* dialect index that server chose */
bool oplocks:1; /* enable oplocks */
unsigned int maxReq; /* Clients should submit no more */
/* than maxReq distinct unanswered SMBs to the server when using */
/* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */
unsigned int maxBuf; /* maxBuf specifies the maximum */
/* message size the server can send or receive for non-raw SMBs */
/* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
/* when socket is setup (and during reconnect) before NegProt sent */
unsigned int max_rw; /* maxRw specifies the maximum */
/* message size the server can send or receive for */
/* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
unsigned int capabilities; /* selective disabling of caps by smb sess */
int timeAdj; /* Adjust for difference in server time zone in sec */
__u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */
char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
/* 16th byte of RFC1001 workstation name is always null */
char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
__u32 sequence_number; /* for signing, protected by srv_mutex */
__u32 reconnect_instance; /* incremented on each reconnect */
struct session_key session_key;
unsigned long lstrp; /* when we got last response from this server */
struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
#define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */
#define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */
char negflavor; /* NEGOTIATE response flavor */
/* extended security flavors that server supports */
bool sec_ntlmssp; /* supports NTLMSSP */
bool sec_kerberosu2u; /* supports U2U Kerberos */
bool sec_kerberos; /* supports plain Kerberos */
bool sec_mskerberos; /* supports legacy MS Kerberos */
bool large_buf; /* is current buffer large? */
/* use SMBD connection instead of socket */
bool rdma;
/* point to the SMBD connection if RDMA is used instead of socket */
struct smbd_connection *smbd_conn;
struct delayed_work echo; /* echo ping workqueue job */
struct delayed_work resolve; /* dns resolution workqueue job */
char *smallbuf; /* pointer to current "small" buffer */
char *bigbuf; /* pointer to current "big" buffer */
/* Total size of this PDU. Only valid from cifs_demultiplex_thread */
unsigned int pdu_size;
unsigned int total_read; /* total amount of data read in this pass */
atomic_t in_send; /* requests trying to send */
atomic_t num_waiters; /* blocked waiting to get in sendrecv */
#ifdef CONFIG_CIFS_STATS2
atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
__u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */
__u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS];
__u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS];
#endif /* STATS2 */
unsigned int max_read;
unsigned int max_write;
unsigned int min_offload;
__le16 compress_algorithm;
__u16 signing_algorithm;
__le16 cipher_type;
/* save initital negprot hash */
__u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
bool signing_negotiated; /* true if valid signing context rcvd from server */
bool posix_ext_supported;
struct delayed_work reconnect; /* reconnect workqueue job */
struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
unsigned long echo_interval;
/*
* Number of targets available for reconnect. The more targets
* the more tasks have to wait to let the demultiplex thread
* reconnect.
*/
int nr_targets;
bool noblockcnt; /* use non-blocking connect() */
/*
* If this is a session channel,
* primary_server holds the ref-counted
* pointer to primary channel connection for the session.
*/
#define CIFS_SERVER_IS_CHAN(server) (!!(server)->primary_server)
struct TCP_Server_Info *primary_server;
#ifdef CONFIG_CIFS_SWN_UPCALL
bool use_swn_dstaddr;
struct sockaddr_storage swn_dstaddr;
#endif
#ifdef CONFIG_CIFS_DFS_UPCALL
bool is_dfs_conn; /* if a dfs connection */
struct mutex refpath_lock; /* protects leaf_fullpath */
/*
* Canonical DFS full paths that were used to chase referrals in mount and reconnect.
*
* origin_fullpath: first or original referral path
* leaf_fullpath: last referral path (might be changed due to nested links in reconnect)
*
* current_fullpath: pointer to either origin_fullpath or leaf_fullpath
* NOTE: cannot be accessed outside cifs_reconnect() and smb2_reconnect()
*
* format: \\HOST\SHARE\[OPTIONAL PATH]
*/
char *origin_fullpath, *leaf_fullpath, *current_fullpath;
#endif
};
static inline bool is_smb1(struct TCP_Server_Info *server)
{
return HEADER_PREAMBLE_SIZE(server) != 0;
}
static inline void cifs_server_lock(struct TCP_Server_Info *server)
{
unsigned int nofs_flag = memalloc_nofs_save();
mutex_lock(&server->_srv_mutex);
server->nofs_flag = nofs_flag;
}
static inline void cifs_server_unlock(struct TCP_Server_Info *server)
{
unsigned int nofs_flag = server->nofs_flag;
mutex_unlock(&server->_srv_mutex);
memalloc_nofs_restore(nofs_flag);
}
struct cifs_credits {
unsigned int value;
unsigned int instance;
};
static inline unsigned int
in_flight(struct TCP_Server_Info *server)
{
unsigned int num;
spin_lock(&server->req_lock);
num = server->in_flight;
spin_unlock(&server->req_lock);
return num;
}
static inline bool
has_credits(struct TCP_Server_Info *server, int *credits, int num_credits)
{
int num;
spin_lock(&server->req_lock);
num = *credits;
spin_unlock(&server->req_lock);
return num >= num_credits;
}
static inline void
add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits,
const int optype)
{
server->ops->add_credits(server, credits, optype);
}
static inline void
add_credits_and_wake_if(struct TCP_Server_Info *server,
const struct cifs_credits *credits, const int optype)
{
if (credits->value) {
server->ops->add_credits(server, credits, optype);
wake_up(&server->request_q);
}
}
static inline void
set_credits(struct TCP_Server_Info *server, const int val)
{
server->ops->set_credits(server, val);
}
static inline int
adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits,
const unsigned int payload_size)
{
return server->ops->adjust_credits ?
server->ops->adjust_credits(server, credits, payload_size) : 0;
}
static inline __le64
get_next_mid64(struct TCP_Server_Info *server)
{
return cpu_to_le64(server->ops->get_next_mid(server));
}
static inline __le16
get_next_mid(struct TCP_Server_Info *server)
{
__u16 mid = server->ops->get_next_mid(server);
/*
* The value in the SMB header should be little endian for easy
* on-the-wire decoding.
*/
return cpu_to_le16(mid);
}
static inline void
revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
{
if (server->ops->revert_current_mid)
server->ops->revert_current_mid(server, val);
}
static inline void
revert_current_mid_from_hdr(struct TCP_Server_Info *server,
const struct smb2_hdr *shdr)
{
unsigned int num = le16_to_cpu(shdr->CreditCharge);
return revert_current_mid(server, num > 0 ? num : 1);
}
static inline __u16
get_mid(const struct smb_hdr *smb)
{
return le16_to_cpu(smb->Mid);
}
static inline bool
compare_mid(__u16 mid, const struct smb_hdr *smb)
{
return mid == le16_to_cpu(smb->Mid);
}
/*
* When the server supports very large reads and writes via POSIX extensions,
* we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
* including the RFC1001 length.
*
* Note that this might make for "interesting" allocation problems during
* writeback however as we have to allocate an array of pointers for the
* pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
*
* For reads, there is a similar problem as we need to allocate an array
* of kvecs to handle the receive, though that should only need to be done
* once.
*/
#define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
#define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
/*
* When the server doesn't allow large posix writes, only allow a rsize/wsize
* of 2^17-1 minus the size of the call header. That allows for a read or
* write up to the maximum size described by RFC1002.
*/
#define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
#define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
#define CIFS_DEFAULT_IOSIZE (1024 * 1024)
/*
* Windows only supports a max of 60kb reads and 65535 byte writes. Default to
* those values when posix extensions aren't in force. In actuality here, we
* use 65536 to allow for a write that is a multiple of 4k. Most servers seem
* to be ok with the extra byte even though Windows doesn't send writes that
* are that large.
*
* Citation:
*
* https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
*/
#define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
#define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
/*
* Macros to allow the TCP_Server_Info->net field and related code to drop out
* when CONFIG_NET_NS isn't set.
*/
#ifdef CONFIG_NET_NS
static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
{
return srv->net;
}
static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
{
srv->net = net;
}
#else
static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
{
return &init_net;
}
static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
{
}
#endif
struct cifs_server_iface {
struct list_head iface_head;
struct kref refcount;
size_t speed;
unsigned int rdma_capable : 1;
unsigned int rss_capable : 1;
unsigned int is_active : 1; /* unset if non existent */
struct sockaddr_storage sockaddr;
};
/* release iface when last ref is dropped */
static inline void
release_iface(struct kref *ref)
{
struct cifs_server_iface *iface = container_of(ref,
struct cifs_server_iface,
refcount);
list_del_init(&iface->iface_head);
kfree(iface);
}
/*
* compare two interfaces a and b
* return 0 if everything matches.
* return 1 if a has higher link speed, or rdma capable, or rss capable
* return -1 otherwise.
*/
static inline int
iface_cmp(struct cifs_server_iface *a, struct cifs_server_iface *b)
{
int cmp_ret = 0;
WARN_ON(!a || !b);
if (a->speed == b->speed) {
if (a->rdma_capable == b->rdma_capable) {
if (a->rss_capable == b->rss_capable) {
cmp_ret = memcmp(&a->sockaddr, &b->sockaddr,
sizeof(a->sockaddr));
if (!cmp_ret)
return 0;
else if (cmp_ret > 0)
return 1;
else
return -1;
} else if (a->rss_capable > b->rss_capable)
return 1;
else
return -1;
} else if (a->rdma_capable > b->rdma_capable)
return 1;
else
return -1;
} else if (a->speed > b->speed)
return 1;
else
return -1;
}
struct cifs_chan {
unsigned int in_reconnect : 1; /* if session setup in progress for this channel */
struct TCP_Server_Info *server;
struct cifs_server_iface *iface; /* interface in use */
__u8 signkey[SMB3_SIGN_KEY_SIZE];
};
/*
* Session structure. One of these for each uid session with a particular host
*/
struct cifs_ses {
struct list_head smb_ses_list;
struct list_head rlist; /* reconnect list */
struct list_head tcon_list;
struct cifs_tcon *tcon_ipc;
spinlock_t ses_lock; /* protect anything here that is not protected */
struct mutex session_mutex;
struct TCP_Server_Info *server; /* pointer to server info */
int ses_count; /* reference counter */
enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */
unsigned overrideSecFlg; /* if non-zero override global sec flags */
char *serverOS; /* name of operating system underlying server */
char *serverNOS; /* name of network operating system of server */
char *serverDomain; /* security realm of server */
__u64 Suid; /* remote smb uid */
kuid_t linux_uid; /* overriding owner of files on the mount */
kuid_t cred_uid; /* owner of credentials */
unsigned int capabilities;
char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */
char *user_name; /* must not be null except during init of sess
and after mount option parsing we fill it */
char *domainName;
char *password;
char workstation_name[CIFS_MAX_WORKSTATION_LEN];
struct session_key auth_key;
struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
enum securityEnum sectype; /* what security flavor was specified? */
bool sign; /* is signing required? */
bool domainAuto:1;
__u16 session_flags;
__u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
__u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE];
__u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE];
__u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
/*
* Network interfaces available on the server this session is
* connected to.
*
* Other channels can be opened by connecting and binding this
* session to interfaces from this list.
*
* iface_lock should be taken when accessing any of these fields
*/
spinlock_t iface_lock;
/* ========= begin: protected by iface_lock ======== */
struct list_head iface_list;
size_t iface_count;
unsigned long iface_last_update; /* jiffies */
/* ========= end: protected by iface_lock ======== */
spinlock_t chan_lock;
/* ========= begin: protected by chan_lock ======== */
#define CIFS_MAX_CHANNELS 16
#define CIFS_ALL_CHANNELS_SET(ses) \
((1UL << (ses)->chan_count) - 1)
#define CIFS_ALL_CHANS_GOOD(ses) \
(!(ses)->chans_need_reconnect)
#define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \
((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses))
#define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \
((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses))
#define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \
test_bit((index), &(ses)->chans_need_reconnect)
#define CIFS_CHAN_IN_RECONNECT(ses, index) \
((ses)->chans[(index)].in_reconnect)
struct cifs_chan chans[CIFS_MAX_CHANNELS];
size_t chan_count;
size_t chan_max;
atomic_t chan_seq; /* round robin state */
/*
* chans_need_reconnect is a bitmap indicating which of the channels
* under this smb session needs to be reconnected.
* If not multichannel session, only one bit will be used.
*
* We will ask for sess and tcon reconnection only if all the
* channels are marked for needing reconnection. This will
* enable the sessions on top to continue to live till any
* of the channels below are active.
*/
unsigned long chans_need_reconnect;
/* ========= end: protected by chan_lock ======== */
};
static inline bool
cap_unix(struct cifs_ses *ses)
{
return ses->server->vals->cap_unix & ses->capabilities;
}
/*
* common struct for holding inode info when searching for or updating an
* inode with new info
*/
#define CIFS_FATTR_DFS_REFERRAL 0x1
#define CIFS_FATTR_DELETE_PENDING 0x2
#define CIFS_FATTR_NEED_REVAL 0x4
#define CIFS_FATTR_INO_COLLISION 0x8
#define CIFS_FATTR_UNKNOWN_NLINK 0x10
#define CIFS_FATTR_FAKE_ROOT_INO 0x20
struct cifs_fattr {
u32 cf_flags;
u32 cf_cifsattrs;
u64 cf_uniqueid;
u64 cf_eof;
u64 cf_bytes;
u64 cf_createtime;
kuid_t cf_uid;
kgid_t cf_gid;
umode_t cf_mode;
dev_t cf_rdev;
unsigned int cf_nlink;
unsigned int cf_dtype;
struct timespec64 cf_atime;
struct timespec64 cf_mtime;
struct timespec64 cf_ctime;
u32 cf_cifstag;
char *cf_symlink_target;
};
/*
* there is one of these for each connection to a resource on a particular
* session
*/
struct cifs_tcon {
struct list_head tcon_list;
int tc_count;
struct list_head rlist; /* reconnect list */
spinlock_t tc_lock; /* protect anything here that is not protected */
atomic_t num_local_opens; /* num of all opens including disconnected */
atomic_t num_remote_opens; /* num of all network opens on server */
struct list_head openFileList;
spinlock_t open_file_lock; /* protects list above */
struct cifs_ses *ses; /* pointer to session associated with */
char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
char *nativeFileSystem;
char *password; /* for share-level security */
__u32 tid; /* The 4 byte tree id */
__u16 Flags; /* optional support bits */
enum tid_status_enum status;
atomic_t num_smbs_sent;
union {
struct {
atomic_t num_writes;
atomic_t num_reads;
atomic_t num_flushes;
atomic_t num_oplock_brks;
atomic_t num_opens;
atomic_t num_closes;
atomic_t num_deletes;
atomic_t num_mkdirs;
atomic_t num_posixopens;
atomic_t num_posixmkdirs;
atomic_t num_rmdirs;
atomic_t num_renames;
atomic_t num_t2renames;
atomic_t num_ffirst;
atomic_t num_fnext;
atomic_t num_fclose;
atomic_t num_hardlinks;
atomic_t num_symlinks;
atomic_t num_locks;
atomic_t num_acl_get;
atomic_t num_acl_set;
} cifs_stats;
struct {
atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
} smb2_stats;
} stats;
__u64 bytes_read;
__u64 bytes_written;
spinlock_t stat_lock; /* protects the two fields above */
FILE_SYSTEM_DEVICE_INFO fsDevInfo;
FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
FILE_SYSTEM_UNIX_INFO fsUnixInfo;
bool ipc:1; /* set if connection to IPC$ share (always also pipe) */
bool pipe:1; /* set if connection to pipe share */
bool print:1; /* set if connection to printer share */
bool retry:1;
bool nocase:1;
bool nohandlecache:1; /* if strange server resource prob can turn off */
bool nodelete:1;
bool seal:1; /* transport encryption for this mounted share */
bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol
for this mount even if server would support */
bool posix_extensions; /* if true SMB3.11 posix extensions enabled */
bool local_lease:1; /* check leases (only) on local system not remote */
bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
bool broken_sparse_sup; /* if server or share does not support sparse */
bool need_reconnect:1; /* connection reset, tid now invalid */
bool need_reopen_files:1; /* need to reopen tcon file handles */
bool use_resilient:1; /* use resilient instead of durable handles */
bool use_persistent:1; /* use persistent instead of durable handles */
bool no_lease:1; /* Do not request leases on files or directories */
bool use_witness:1; /* use witness protocol */
__le32 capabilities;
__u32 share_flags;
__u32 maximal_access;
__u32 vol_serial_number;
__le64 vol_create_time;
__u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
__u32 handle_timeout; /* persistent and durable handle timeout in ms */
__u32 ss_flags; /* sector size flags */
__u32 perf_sector_size; /* best sector size for perf */
__u32 max_chunks;
__u32 max_bytes_chunk;
__u32 max_bytes_copy;
#ifdef CONFIG_CIFS_FSCACHE
u64 resource_id; /* server resource id */
struct fscache_volume *fscache; /* cookie for share */
#endif
struct list_head pending_opens; /* list of incomplete opens */
struct cached_fids *cfids;
/* BB add field for back pointer to sb struct(s)? */
#ifdef CONFIG_CIFS_DFS_UPCALL
struct list_head ulist; /* cache update list */
#endif
struct delayed_work query_interfaces; /* query interfaces workqueue job */
};
/*
* This is a refcounted and timestamped container for a tcon pointer. The
* container holds a tcon reference. It is considered safe to free one of
* these when the tl_count goes to 0. The tl_time is the time of the last
* "get" on the container.
*/
struct tcon_link {
struct rb_node tl_rbnode;
kuid_t tl_uid;
unsigned long tl_flags;
#define TCON_LINK_MASTER 0
#define TCON_LINK_PENDING 1
#define TCON_LINK_IN_TREE 2
unsigned long tl_time;
atomic_t tl_count;
struct cifs_tcon *tl_tcon;
};
extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst);
static inline struct cifs_tcon *
tlink_tcon(struct tcon_link *tlink)
{
return tlink->tl_tcon;
}
static inline struct tcon_link *
cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
{
return cifs_sb->master_tlink;
}
extern void cifs_put_tlink(struct tcon_link *tlink);
static inline struct tcon_link *
cifs_get_tlink(struct tcon_link *tlink)
{
if (tlink && !IS_ERR(tlink))
atomic_inc(&tlink->tl_count);
return tlink;
}
/* This function is always expected to succeed */
extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
#define CIFS_OPLOCK_NO_CHANGE 0xfe
struct cifs_pending_open {
struct list_head olist;
struct tcon_link *tlink;
__u8 lease_key[16];
__u32 oplock;
};
struct cifs_deferred_close {
struct list_head dlist;
struct tcon_link *tlink;
__u16 netfid;
__u64 persistent_fid;
__u64 volatile_fid;
};
/*
* This info hangs off the cifsFileInfo structure, pointed to by llist.
* This is used to track byte stream locks on the file
*/
struct cifsLockInfo {
struct list_head llist; /* pointer to next cifsLockInfo */
struct list_head blist; /* pointer to locks blocked on this */
wait_queue_head_t block_q;
__u64 offset;
__u64 length;
__u32 pid;
__u16 type;
__u16 flags;
};
/*
* One of these for each open instance of a file
*/
struct cifs_search_info {
loff_t index_of_last_entry;
__u16 entries_in_buffer;
__u16 info_level;
__u32 resume_key;
char *ntwrk_buf_start;
char *srch_entries_start;
char *last_entry;
const char *presume_name;
unsigned int resume_name_len;
bool endOfSearch:1;
bool emptyDir:1;
bool unicode:1;
bool smallBuf:1; /* so we know which buf_release function to call */
};
#define ACL_NO_MODE ((umode_t)(-1))
struct cifs_open_parms {
struct cifs_tcon *tcon;
struct cifs_sb_info *cifs_sb;
int disposition;
int desired_access;
int create_options;
const char *path;
struct cifs_fid *fid;
umode_t mode;
bool reconnect:1;
};
struct cifs_fid {
__u16 netfid;
__u64 persistent_fid; /* persist file id for smb2 */
__u64 volatile_fid; /* volatile file id for smb2 */
__u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */
__u8 create_guid[16];
__u32 access;
struct cifs_pending_open *pending_open;
unsigned int epoch;
#ifdef CONFIG_CIFS_DEBUG2
__u64 mid;
#endif /* CIFS_DEBUG2 */
bool purge_cache;
};
struct cifs_fid_locks {
struct list_head llist;
struct cifsFileInfo *cfile; /* fid that owns locks */
struct list_head locks; /* locks held by fid above */
};
struct cifsFileInfo {
/* following two lists are protected by tcon->open_file_lock */
struct list_head tlist; /* pointer to next fid owned by tcon */
struct list_head flist; /* next fid (file instance) for this inode */
/* lock list below protected by cifsi->lock_sem */
struct cifs_fid_locks *llist; /* brlocks held by this fid */
kuid_t uid; /* allows finding which FileInfo structure */
__u32 pid; /* process id who opened file */
struct cifs_fid fid; /* file id from remote */
struct list_head rlist; /* reconnect list */
/* BB add lock scope info here if needed */ ;
/* lock scope id (0 if none) */
struct dentry *dentry;
struct tcon_link *tlink;
unsigned int f_flags;
bool invalidHandle:1; /* file closed via session abend */
bool swapfile:1;
bool oplock_break_cancelled:1;
unsigned int oplock_epoch; /* epoch from the lease break */
__u32 oplock_level; /* oplock/lease level from the lease break */
int count;
spinlock_t file_info_lock; /* protects four flag/count fields above */
struct mutex fh_mutex; /* prevents reopen race after dead ses*/
struct cifs_search_info srch_inf;
struct work_struct oplock_break; /* work for oplock breaks */
struct work_struct put; /* work for the final part of _put */
struct delayed_work deferred;
bool deferred_close_scheduled; /* Flag to indicate close is scheduled */
char *symlink_target;
};
struct cifs_io_parms {
__u16 netfid;
__u64 persistent_fid; /* persist file id for smb2 */
__u64 volatile_fid; /* volatile file id for smb2 */
__u32 pid;
__u64 offset;
unsigned int length;
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
};
struct cifs_aio_ctx {
struct kref refcount;
struct list_head list;
struct mutex aio_mutex;
struct completion done;
struct iov_iter iter;
struct kiocb *iocb;
struct cifsFileInfo *cfile;
struct bio_vec *bv;
loff_t pos;
unsigned int npages;
ssize_t rc;
unsigned int len;
unsigned int total_len;
bool should_dirty;
/*
* Indicates if this aio_ctx is for direct_io,
* If yes, iter is a copy of the user passed iov_iter
*/
bool direct_io;
};
/* asynchronous read support */
struct cifs_readdata {
struct kref refcount;
struct list_head list;
struct completion done;
struct cifsFileInfo *cfile;
struct address_space *mapping;
struct cifs_aio_ctx *ctx;
__u64 offset;
unsigned int bytes;
unsigned int got_bytes;
pid_t pid;
int result;
struct work_struct work;
int (*read_into_pages)(struct TCP_Server_Info *server,
struct cifs_readdata *rdata,
unsigned int len);
int (*copy_into_pages)(struct TCP_Server_Info *server,
struct cifs_readdata *rdata,
struct iov_iter *iter);
struct kvec iov[2];
struct TCP_Server_Info *server;
#ifdef CONFIG_CIFS_SMB_DIRECT
struct smbd_mr *mr;
#endif
unsigned int pagesz;
unsigned int page_offset;
unsigned int tailsz;
struct cifs_credits credits;
unsigned int nr_pages;
struct page **pages;
};
/* asynchronous write support */
struct cifs_writedata {
struct kref refcount;
struct list_head list;
struct completion done;
enum writeback_sync_modes sync_mode;
struct work_struct work;
struct cifsFileInfo *cfile;
struct cifs_aio_ctx *ctx;
__u64 offset;
pid_t pid;
unsigned int bytes;
int result;
struct TCP_Server_Info *server;
#ifdef CONFIG_CIFS_SMB_DIRECT
struct smbd_mr *mr;
#endif
unsigned int pagesz;
unsigned int page_offset;
unsigned int tailsz;
struct cifs_credits credits;
unsigned int nr_pages;
struct page **pages;
};
/*
* Take a reference on the file private data. Must be called with
* cfile->file_info_lock held.
*/
static inline void
cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
{
++cifs_file->count;
}
struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr,
bool offload);
void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
#define CIFS_CACHE_READ_FLG 1
#define CIFS_CACHE_HANDLE_FLG 2
#define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
#define CIFS_CACHE_WRITE_FLG 4
#define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
#define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
#define CIFS_CACHE_READ(cinode) ((cinode->oplock & CIFS_CACHE_READ_FLG) || (CIFS_SB(cinode->netfs.inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE))
#define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
#define CIFS_CACHE_WRITE(cinode) ((cinode->oplock & CIFS_CACHE_WRITE_FLG) || (CIFS_SB(cinode->netfs.inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE))
/*
* One of these for each file inode
*/
struct cifsInodeInfo {
struct netfs_inode netfs; /* Netfslib context and vfs inode */
bool can_cache_brlcks;
struct list_head llist; /* locks helb by this inode */
/*
* NOTE: Some code paths call down_read(lock_sem) twice, so
* we must always use cifs_down_write() instead of down_write()
* for this semaphore to avoid deadlocks.
*/
struct rw_semaphore lock_sem; /* protect the fields above */
/* BB add in lists for dirty pages i.e. write caching info for oplock */
struct list_head openFileList;
spinlock_t open_file_lock; /* protects openFileList */
__u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
unsigned int oplock; /* oplock/lease level we have */
unsigned int epoch; /* used to track lease state changes */
#define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */
#define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */
#define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */
#define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */
#define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */
#define CIFS_INO_LOCK (5) /* lock bit for synchronization */
#define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */
#define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */
unsigned long flags;
spinlock_t writers_lock;
unsigned int writers; /* Number of writers on this inode */
unsigned long time; /* jiffies of last update of inode */
u64 server_eof; /* current file size on server -- protected by i_lock */
u64 uniqueid; /* server inode number */
u64 createtime; /* creation time on server */
__u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */
struct list_head deferred_closes; /* list of deferred closes */
spinlock_t deferred_lock; /* protection on deferred list */
bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */
char *symlink_target;
};
static inline struct cifsInodeInfo *
CIFS_I(struct inode *inode)
{
return container_of(inode, struct cifsInodeInfo, netfs.inode);
}
static inline struct cifs_sb_info *
CIFS_SB(struct super_block *sb)
{
return sb->s_fs_info;
}
static inline struct cifs_sb_info *
CIFS_FILE_SB(struct file *file)
{
return CIFS_SB(file_inode(file)->i_sb);
}
static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
{
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
return '/';
else
return '\\';
}
static inline void
convert_delimiter(char *path, char delim)
{
char old_delim, *pos;
if (delim == '/')
old_delim = '\\';
else
old_delim = '/';
pos = path;
while ((pos = strchr(pos, old_delim)))
*pos = delim;
}
#define cifs_stats_inc atomic_inc
static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
unsigned int bytes)
{
if (bytes) {
spin_lock(&tcon->stat_lock);
tcon->bytes_written += bytes;
spin_unlock(&tcon->stat_lock);
}
}
static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
unsigned int bytes)
{
spin_lock(&tcon->stat_lock);
tcon->bytes_read += bytes;
spin_unlock(&tcon->stat_lock);
}
/*
* This is the prototype for the mid receive function. This function is for
* receiving the rest of the SMB frame, starting with the WordCount (which is
* just after the MID in struct smb_hdr). Note:
*
* - This will be called by cifsd, with no locks held.
* - The mid will still be on the pending_mid_q.
* - mid->resp_buf will point to the current buffer.
*
* Returns zero on a successful receive, or an error. The receive state in
* the TCP_Server_Info will also be updated.
*/
typedef int (mid_receive_t)(struct TCP_Server_Info *server,
struct mid_q_entry *mid);
/*
* This is the prototype for the mid callback function. This is called once the
* mid has been received off of the socket. When creating one, take special
* care to avoid deadlocks. Things to bear in mind:
*
* - it will be called by cifsd, with no locks held
* - the mid will be removed from any lists
*/
typedef void (mid_callback_t)(struct mid_q_entry *mid);
/*
* This is the protopyte for mid handle function. This is called once the mid
* has been recognized after decryption of the message.
*/
typedef int (mid_handle_t)(struct TCP_Server_Info *server,
struct mid_q_entry *mid);
/* one of these for every pending CIFS request to the server */
struct mid_q_entry {
struct list_head qhead; /* mids waiting on reply from this server */
struct kref refcount;
struct TCP_Server_Info *server; /* server corresponding to this mid */
__u64 mid; /* multiplex id */
__u16 credits; /* number of credits consumed by this mid */
__u16 credits_received; /* number of credits from the response */
__u32 pid; /* process id */
__u32 sequence_number; /* for CIFS signing */
unsigned long when_alloc; /* when mid was created */
#ifdef CONFIG_CIFS_STATS2
unsigned long when_sent; /* time when smb send finished */
unsigned long when_received; /* when demux complete (taken off wire) */
#endif
mid_receive_t *receive; /* call receive callback */
mid_callback_t *callback; /* call completion callback */
mid_handle_t *handle; /* call handle mid callback */
void *callback_data; /* general purpose pointer for callback */
struct task_struct *creator;
void *resp_buf; /* pointer to received SMB header */
unsigned int resp_buf_size;
int mid_state; /* wish this were enum but can not pass to wait_event */
unsigned int mid_flags;
__le16 command; /* smb command code */
unsigned int optype; /* operation type */
bool large_buf:1; /* if valid response, is pointer to large buf */
bool multiRsp:1; /* multiple trans2 responses for one request */
bool multiEnd:1; /* both received */
bool decrypted:1; /* decrypted entry */
};
struct close_cancelled_open {
struct cifs_fid fid;
struct cifs_tcon *tcon;
struct work_struct work;
__u64 mid;
__u16 cmd;
};
/* Make code in transport.c a little cleaner by moving
update of optional stats into function below */
static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
{
atomic_inc(&server->in_send);
}
static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
{
atomic_dec(&server->in_send);
}
static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
{
atomic_inc(&server->num_waiters);
}
static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
{
atomic_dec(&server->num_waiters);
}
#ifdef CONFIG_CIFS_STATS2
static inline void cifs_save_when_sent(struct mid_q_entry *mid)
{
mid->when_sent = jiffies;
}
#else
static inline void cifs_save_when_sent(struct mid_q_entry *mid)
{
}
#endif
/* for pending dnotify requests */
struct dir_notify_req {
struct list_head lhead;
__le16 Pid;
__le16 PidHigh;
__u16 Mid;
__u16 Tid;
__u16 Uid;
__u16 netfid;
__u32 filter; /* CompletionFilter (for multishot) */
int multishot;
struct file *pfile;
};
struct dfs_info3_param {
int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
int path_consumed;
int server_type;
int ref_flag;
char *path_name;
char *node_name;
int ttl;
};
struct file_list {
struct list_head list;
struct cifsFileInfo *cfile;
};
static inline void free_dfs_info_param(struct dfs_info3_param *param)
{
if (param) {
kfree(param->path_name);
kfree(param->node_name);
}
}
static inline void free_dfs_info_array(struct dfs_info3_param *param,
int number_of_items)
{
int i;
if ((number_of_items == 0) || (param == NULL))
return;
for (i = 0; i < number_of_items; i++) {
kfree(param[i].path_name);
kfree(param[i].node_name);
}
kfree(param);
}
static inline bool is_interrupt_error(int error)
{
switch (error) {
case -EINTR:
case -ERESTARTSYS:
case -ERESTARTNOHAND:
case -ERESTARTNOINTR:
return true;
}
return false;
}
static inline bool is_retryable_error(int error)
{
if (is_interrupt_error(error) || error == -EAGAIN)
return true;
return false;
}
/* cifs_get_writable_file() flags */
#define FIND_WR_ANY 0
#define FIND_WR_FSUID_ONLY 1
#define FIND_WR_WITH_DELETE 2
#define MID_FREE 0
#define MID_REQUEST_ALLOCATED 1
#define MID_REQUEST_SUBMITTED 2
#define MID_RESPONSE_RECEIVED 4
#define MID_RETRY_NEEDED 8 /* session closed while this request out */
#define MID_RESPONSE_MALFORMED 0x10
#define MID_SHUTDOWN 0x20
/* Flags */
#define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */
#define MID_DELETED 2 /* Mid has been dequeued/deleted */
/* Types of response buffer returned from SendReceive2 */
#define CIFS_NO_BUFFER 0 /* Response buffer not returned */
#define CIFS_SMALL_BUFFER 1
#define CIFS_LARGE_BUFFER 2
#define CIFS_IOVEC 4 /* array of response buffers */
/* Type of Request to SendReceive2 */
#define CIFS_BLOCKING_OP 1 /* operation can block */
#define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */
#define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */
#define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */
#define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
#define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */
/* Type of request operation */
#define CIFS_ECHO_OP 0x080 /* echo request */
#define CIFS_OBREAK_OP 0x0100 /* oplock break request */
#define CIFS_NEG_OP 0x0200 /* negotiate request */
#define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */
/* Lower bitmask values are reserved by others below. */
#define CIFS_SESS_OP 0x2000 /* session setup request */
#define CIFS_OP_MASK 0x2780 /* mask request type */
#define CIFS_HAS_CREDITS 0x0400 /* already has credits */
#define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */
#define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */
/* Security Flags: indicate type of session setup needed */
#define CIFSSEC_MAY_SIGN 0x00001
#define CIFSSEC_MAY_NTLMV2 0x00004
#define CIFSSEC_MAY_KRB5 0x00008
#define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */
#define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */
#define CIFSSEC_MUST_SIGN 0x01001
/* note that only one of the following can be set so the
result of setting MUST flags more than once will be to
require use of the stronger protocol */
#define CIFSSEC_MUST_NTLMV2 0x04004
#define CIFSSEC_MUST_KRB5 0x08008
#ifdef CONFIG_CIFS_UPCALL
#define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */
#else
#define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */
#endif /* UPCALL */
#define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */
#define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */
#define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
#define CIFSSEC_MAX (CIFSSEC_MUST_NTLMV2)
#define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
/*
*****************************************************************
* All constants go here
*****************************************************************
*/
#define UID_HASH (16)
/*
* Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
* following to be declared.
*/
/****************************************************************************
* Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according
* to the locking order. i.e. if two locks are to be held together, the lock that
* appears higher in this list needs to be taken before the other.
*
* If you hold a lock that is lower in this list, and you need to take a higher lock
* (or if you think that one of the functions that you're calling may need to), first
* drop the lock you hold, pick up the higher lock, then the lower one. This will
* ensure that locks are picked up only in one direction in the below table
* (top to bottom).
*
* Also, if you expect a function to be called with a lock held, explicitly document
* this in the comments on top of your function definition.
*
* And also, try to keep the critical sections (lock hold time) to be as minimal as
* possible. Blocking / calling other functions with a lock held always increase
* the risk of a possible deadlock.
*
* Following this rule will avoid unnecessary deadlocks, which can get really hard to
* debug. Also, any new lock that you introduce, please add to this list in the correct
* order.
*
* Please populate this list whenever you introduce new locks in your changes. Or in
* case I've missed some existing locks. Please ensure that it's added in the list
* based on the locking order expected.
*
* =====================================================================================
* Lock Protects Initialization fn
* =====================================================================================
* vol_list_lock
* vol_info->ctx_lock vol_info->ctx
* cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb
* TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session
* reconnect_mutex
* TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session
* cifs_ses->session_mutex cifs_ses sesInfoAlloc
* cifs_tcon
* cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc
* cifs_tcon->pending_opens
* cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc
* cifs_tcon->bytes_written
* cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc
* GlobalMid_Lock GlobalMaxActiveXid init_cifs
* GlobalCurrentXid
* GlobalTotalActiveXid
* TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change)
* TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session
* ->CurrentMid
* (any changes in mid_q_entry fields)
* TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session
* ->credits
* ->echo_credits
* ->oplock_credits
* ->reconnect_instance
* cifs_ses->ses_lock (anything that is not protected by another lock and can change)
* cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc
* ->iface_count
* ->iface_last_update
* cifs_ses->chan_lock cifs_ses->chans
* ->chans_need_reconnect
* ->chans_in_reconnect
* cifs_tcon->tc_lock (anything that is not protected by another lock and can change)
* cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode
* cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc
* cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once
* ->can_cache_brlcks
* cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc
* cached_fid->fid_mutex cifs_tcon->crfid tconInfoAlloc
* cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo
* cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo
* ->invalidHandle initiate_cifs_search
* ->oplock_break_cancelled
* cifs_aio_ctx->aio_mutex cifs_aio_ctx cifs_aio_ctx_alloc
****************************************************************************/
#ifdef DECLARE_GLOBALS_HERE
#define GLOBAL_EXTERN
#else
#define GLOBAL_EXTERN extern
#endif
/*
* the list of TCP_Server_Info structures, ie each of the sockets
* connecting our client to a distinct server (ip address), is
* chained together by cifs_tcp_ses_list. The list of all our SMB
* sessions (and from that the tree connections) can be found
* by iterating over cifs_tcp_ses_list
*/
extern struct list_head cifs_tcp_ses_list;
/*
* This lock protects the cifs_tcp_ses_list, the list of smb sessions per
* tcp session, and the list of tcon's per smb session. It also protects
* the reference counters for the server, smb session, and tcon.
* generally the locks should be taken in order tcp_ses_lock before
* tcon->open_file_lock and that before file->file_info_lock since the
* structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
*/
extern spinlock_t cifs_tcp_ses_lock;
/*
* Global transaction id (XID) information
*/
extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */
/*
* Global counters, updated atomically
*/
extern atomic_t sesInfoAllocCount;
extern atomic_t tconInfoAllocCount;
extern atomic_t tcpSesNextId;
extern atomic_t tcpSesAllocCount;
extern atomic_t tcpSesReconnectCount;
extern atomic_t tconInfoReconnectCount;
/* Various Debug counters */
extern atomic_t buf_alloc_count; /* current number allocated */
extern atomic_t small_buf_alloc_count;
#ifdef CONFIG_CIFS_STATS2
extern atomic_t total_buf_alloc_count; /* total allocated over all time */
extern atomic_t total_small_buf_alloc_count;
extern unsigned int slow_rsp_threshold; /* number of secs before logging */
#endif
/* Misc globals */
extern bool enable_oplocks; /* enable or disable oplocks */
extern bool lookupCacheEnabled;
extern unsigned int global_secflags; /* if on, session setup sent
with more secure ntlmssp2 challenge/resp */
extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */
extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */
extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */
extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
extern unsigned int CIFSMaxBufSize; /* max size not including hdr */
extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
extern unsigned int cifs_min_small; /* min size of small buf pool */
extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */
extern atomic_t mid_count;
void cifs_oplock_break(struct work_struct *work);
void cifs_queue_oplock_break(struct cifsFileInfo *cfile);
void smb2_deferred_work_close(struct work_struct *work);
extern const struct slow_work_ops cifs_oplock_break_ops;
extern struct workqueue_struct *cifsiod_wq;
extern struct workqueue_struct *decrypt_wq;
extern struct workqueue_struct *fileinfo_put_wq;
extern struct workqueue_struct *cifsoplockd_wq;
extern struct workqueue_struct *deferredclose_wq;
extern __u32 cifs_lock_secret;
extern mempool_t *cifs_mid_poolp;
/* Operations for different SMB versions */
#define SMB1_VERSION_STRING "1.0"
#define SMB20_VERSION_STRING "2.0"
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
extern struct smb_version_operations smb1_operations;
extern struct smb_version_values smb1_values;
extern struct smb_version_operations smb20_operations;
extern struct smb_version_values smb20_values;
#endif /* CIFS_ALLOW_INSECURE_LEGACY */
#define SMB21_VERSION_STRING "2.1"
extern struct smb_version_operations smb21_operations;
extern struct smb_version_values smb21_values;
#define SMBDEFAULT_VERSION_STRING "default"
extern struct smb_version_values smbdefault_values;
#define SMB3ANY_VERSION_STRING "3"
extern struct smb_version_values smb3any_values;
#define SMB30_VERSION_STRING "3.0"
extern struct smb_version_operations smb30_operations;
extern struct smb_version_values smb30_values;
#define SMB302_VERSION_STRING "3.02"
#define ALT_SMB302_VERSION_STRING "3.0.2"
/*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
extern struct smb_version_values smb302_values;
#define SMB311_VERSION_STRING "3.1.1"
#define ALT_SMB311_VERSION_STRING "3.11"
extern struct smb_version_operations smb311_operations;
extern struct smb_version_values smb311_values;
static inline char *get_security_type_str(enum securityEnum sectype)
{
switch (sectype) {
case RawNTLMSSP:
return "RawNTLMSSP";
case Kerberos:
return "Kerberos";
case NTLMv2:
return "NTLMv2";
default:
return "Unknown";
}
}
static inline bool is_smb1_server(struct TCP_Server_Info *server)
{
return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;
}
static inline bool is_tcon_dfs(struct cifs_tcon *tcon)
{
/*
* For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS
* Subsystem Notifies That a Share Is a DFS Share.
*
* For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server
* Application Updates a Share.
*/
if (!tcon || !tcon->ses || !tcon->ses->server)
return false;
return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS :
tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);
}
static inline bool cifs_is_referral_server(struct cifs_tcon *tcon,
const struct dfs_info3_param *ref)
{
/*
* Check if all targets are capable of handling DFS referrals as per
* MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL.
*/
return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER));
}
static inline u64 cifs_flock_len(const struct file_lock *fl)
{
return (u64)fl->fl_end - fl->fl_start + 1;
}
static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses)
{
if (WARN_ON_ONCE(!ses || !ses->server))
return 0;
/*
* Make workstation name no more than 15 chars when using insecure dialects as some legacy
* servers do require it during NTLMSSP.
*/
if (ses->server->dialect <= SMB20_PROT_ID)
return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL);
return sizeof(ses->workstation_name);
}
static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src)
{
memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src));
dst->AccessFlags = src->AccessFlags;
dst->CurrentByteOffset = src->CurrentByteOffset;
dst->Mode = src->Mode;
dst->AlignmentRequirement = src->AlignmentRequirement;
dst->FileNameLength = src->FileNameLength;
}
#endif /* _CIFS_GLOB_H */
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