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android_kernel_xiaomi_sm8350/include/linux/ncp_fs.h
Petr Vandrovec 2e54eb96e2 BKL: Remove BKL from ncpfs 
Dozen of changes in ncpfs to provide some locking other than BKL.

In readdir cache unlock and mark complete first page as last operation,
so it can be used for synchronization, as code intended.

When updating dentry name on case insensitive filesystems do at least
some basic locking...

Hold i_mutex when updating inode fields.

Push some ncp_conn_is_valid down to ncp_request.  Connection can become
invalid at any moment, and fewer error code paths to test the better.

Use i_size_{read,write} to modify file size.

Set inode's backing_dev_info as ncpfs has its own special bdi.

In ioctl unbreak ioctls invoked on filesystem mounted 'ro' - tests are
for inode writeable or owner match, but were turned to filesystem
writeable and inode writeable or owner match.  Also collect all permission
checks in single place.

Add some locking, and remove comments saying that it would be cool to
add some locks to the code.

Constify some pointers.

Signed-off-by: Petr Vandrovec <petr@vandrovec.name>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2010-10-04 21:10:52 +02:00

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/*
* ncp_fs.h
*
* Copyright (C) 1995, 1996 by Volker Lendecke
*
*/
#ifndef _LINUX_NCP_FS_H
#define _LINUX_NCP_FS_H
#include <linux/fs.h>
#include <linux/in.h>
#include <linux/types.h>
#include <linux/magic.h>
#include <linux/ipx.h>
#include <linux/ncp_no.h>
/*
* ioctl commands
*/
struct ncp_ioctl_request {
unsigned int function;
unsigned int size;
char __user *data;
};
struct ncp_fs_info {
int version;
struct sockaddr_ipx addr;
__kernel_uid_t mounted_uid;
int connection; /* Connection number the server assigned us */
int buffer_size; /* The negotiated buffer size, to be
used for read/write requests! */
int volume_number;
__le32 directory_id;
};
struct ncp_fs_info_v2 {
int version;
unsigned long mounted_uid;
unsigned int connection;
unsigned int buffer_size;
unsigned int volume_number;
__le32 directory_id;
__u32 dummy1;
__u32 dummy2;
__u32 dummy3;
};
struct ncp_sign_init
{
char sign_root[8];
char sign_last[16];
};
struct ncp_lock_ioctl
{
#define NCP_LOCK_LOG 0
#define NCP_LOCK_SH 1
#define NCP_LOCK_EX 2
#define NCP_LOCK_CLEAR 256
int cmd;
int origin;
unsigned int offset;
unsigned int length;
#define NCP_LOCK_DEFAULT_TIMEOUT 18
#define NCP_LOCK_MAX_TIMEOUT 180
int timeout;
};
struct ncp_setroot_ioctl
{
int volNumber;
int namespace;
__le32 dirEntNum;
};
struct ncp_objectname_ioctl
{
#define NCP_AUTH_NONE 0x00
#define NCP_AUTH_BIND 0x31
#define NCP_AUTH_NDS 0x32
int auth_type;
size_t object_name_len;
void __user * object_name; /* a userspace data, in most cases user name */
};
struct ncp_privatedata_ioctl
{
size_t len;
void __user * data; /* ~1000 for NDS */
};
/* NLS charsets by ioctl */
#define NCP_IOCSNAME_LEN 20
struct ncp_nls_ioctl
{
unsigned char codepage[NCP_IOCSNAME_LEN+1];
unsigned char iocharset[NCP_IOCSNAME_LEN+1];
};
#define NCP_IOC_NCPREQUEST _IOR('n', 1, struct ncp_ioctl_request)
#define NCP_IOC_GETMOUNTUID _IOW('n', 2, __kernel_old_uid_t)
#define NCP_IOC_GETMOUNTUID2 _IOW('n', 2, unsigned long)
#define NCP_IOC_CONN_LOGGED_IN _IO('n', 3)
#define NCP_GET_FS_INFO_VERSION (1)
#define NCP_IOC_GET_FS_INFO _IOWR('n', 4, struct ncp_fs_info)
#define NCP_GET_FS_INFO_VERSION_V2 (2)
#define NCP_IOC_GET_FS_INFO_V2 _IOWR('n', 4, struct ncp_fs_info_v2)
#define NCP_IOC_SIGN_INIT _IOR('n', 5, struct ncp_sign_init)
#define NCP_IOC_SIGN_WANTED _IOR('n', 6, int)
#define NCP_IOC_SET_SIGN_WANTED _IOW('n', 6, int)
#define NCP_IOC_LOCKUNLOCK _IOR('n', 7, struct ncp_lock_ioctl)
#define NCP_IOC_GETROOT _IOW('n', 8, struct ncp_setroot_ioctl)
#define NCP_IOC_SETROOT _IOR('n', 8, struct ncp_setroot_ioctl)
#define NCP_IOC_GETOBJECTNAME _IOWR('n', 9, struct ncp_objectname_ioctl)
#define NCP_IOC_SETOBJECTNAME _IOR('n', 9, struct ncp_objectname_ioctl)
#define NCP_IOC_GETPRIVATEDATA _IOWR('n', 10, struct ncp_privatedata_ioctl)
#define NCP_IOC_SETPRIVATEDATA _IOR('n', 10, struct ncp_privatedata_ioctl)
#define NCP_IOC_GETCHARSETS _IOWR('n', 11, struct ncp_nls_ioctl)
#define NCP_IOC_SETCHARSETS _IOR('n', 11, struct ncp_nls_ioctl)
#define NCP_IOC_GETDENTRYTTL _IOW('n', 12, __u32)
#define NCP_IOC_SETDENTRYTTL _IOR('n', 12, __u32)
/*
* The packet size to allocate. One page should be enough.
*/
#define NCP_PACKET_SIZE 4070
#define NCP_MAXPATHLEN 255
#define NCP_MAXNAMELEN 14
#ifdef __KERNEL__
#include <linux/ncp_fs_i.h>
#include <linux/ncp_fs_sb.h>
/* define because it is easy to change PRINTK to {*}PRINTK */
#define PRINTK(format, args...) printk(KERN_DEBUG format , ## args)
#undef NCPFS_PARANOIA
#ifdef NCPFS_PARANOIA
#define PPRINTK(format, args...) PRINTK(format , ## args)
#else
#define PPRINTK(format, args...)
#endif
#ifndef DEBUG_NCP
#define DEBUG_NCP 0
#endif
#if DEBUG_NCP > 0
#define DPRINTK(format, args...) PRINTK(format , ## args)
#else
#define DPRINTK(format, args...)
#endif
#if DEBUG_NCP > 1
#define DDPRINTK(format, args...) PRINTK(format , ## args)
#else
#define DDPRINTK(format, args...)
#endif
#define NCP_MAX_RPC_TIMEOUT (6*HZ)
struct ncp_entry_info {
struct nw_info_struct i;
ino_t ino;
int opened;
int access;
unsigned int volume;
__u8 file_handle[6];
};
static inline struct ncp_server *NCP_SBP(struct super_block *sb)
{
return sb->s_fs_info;
}
#define NCP_SERVER(inode) NCP_SBP((inode)->i_sb)
static inline struct ncp_inode_info *NCP_FINFO(struct inode *inode)
{
return container_of(inode, struct ncp_inode_info, vfs_inode);
}
/* linux/fs/ncpfs/inode.c */
int ncp_notify_change(struct dentry *, struct iattr *);
struct inode *ncp_iget(struct super_block *, struct ncp_entry_info *);
void ncp_update_inode(struct inode *, struct ncp_entry_info *);
void ncp_update_inode2(struct inode *, struct ncp_entry_info *);
/* linux/fs/ncpfs/dir.c */
extern const struct inode_operations ncp_dir_inode_operations;
extern const struct file_operations ncp_dir_operations;
extern const struct dentry_operations ncp_root_dentry_operations;
int ncp_conn_logged_in(struct super_block *);
int ncp_date_dos2unix(__le16 time, __le16 date);
void ncp_date_unix2dos(int unix_date, __le16 * time, __le16 * date);
/* linux/fs/ncpfs/ioctl.c */
long ncp_ioctl(struct file *, unsigned int, unsigned long);
long ncp_compat_ioctl(struct file *, unsigned int, unsigned long);
/* linux/fs/ncpfs/sock.c */
int ncp_request2(struct ncp_server *server, int function,
void* reply, int max_reply_size);
static inline int ncp_request(struct ncp_server *server, int function) {
return ncp_request2(server, function, server->packet, server->packet_size);
}
int ncp_connect(struct ncp_server *server);
int ncp_disconnect(struct ncp_server *server);
void ncp_lock_server(struct ncp_server *server);
void ncp_unlock_server(struct ncp_server *server);
/* linux/fs/ncpfs/symlink.c */
#if defined(CONFIG_NCPFS_EXTRAS) || defined(CONFIG_NCPFS_NFS_NS)
extern const struct address_space_operations ncp_symlink_aops;
int ncp_symlink(struct inode*, struct dentry*, const char*);
#endif
/* linux/fs/ncpfs/file.c */
extern const struct inode_operations ncp_file_inode_operations;
extern const struct file_operations ncp_file_operations;
int ncp_make_open(struct inode *, int);
/* linux/fs/ncpfs/mmap.c */
int ncp_mmap(struct file *, struct vm_area_struct *);
/* linux/fs/ncpfs/ncplib_kernel.c */
int ncp_make_closed(struct inode *);
#endif /* __KERNEL__ */
#endif /* _LINUX_NCP_FS_H */
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