251 lines
7.4 KiB
C
251 lines
7.4 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0-only */
|
||
|
|
/*
|
||
|
|
* include/net/9p/client.h
|
||
|
|
*
|
||
|
|
* 9P Client Definitions
|
||
|
|
*
|
||
|
|
* Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
|
||
|
|
* Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef NET_9P_CLIENT_H
|
||
|
|
#define NET_9P_CLIENT_H
|
||
|
|
|
||
|
|
#include <linux/utsname.h>
|
||
|
|
#include <linux/idr.h>
|
||
|
|
|
||
|
|
/* Number of requests per row */
|
||
|
|
#define P9_ROW_MAXTAG 255
|
||
|
|
|
||
|
|
/** enum p9_proto_versions - 9P protocol versions
|
||
|
|
* @p9_proto_legacy: 9P Legacy mode, pre-9P2000.u
|
||
|
|
* @p9_proto_2000u: 9P2000.u extension
|
||
|
|
* @p9_proto_2000L: 9P2000.L extension
|
||
|
|
*/
|
||
|
|
|
||
|
|
enum p9_proto_versions{
|
||
|
|
p9_proto_legacy,
|
||
|
|
p9_proto_2000u,
|
||
|
|
p9_proto_2000L,
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* enum p9_trans_status - different states of underlying transports
|
||
|
|
* @Connected: transport is connected and healthy
|
||
|
|
* @Disconnected: transport has been disconnected
|
||
|
|
* @Hung: transport is connected by wedged
|
||
|
|
*
|
||
|
|
* This enumeration details the various states a transport
|
||
|
|
* instatiation can be in.
|
||
|
|
*/
|
||
|
|
|
||
|
|
enum p9_trans_status {
|
||
|
|
Connected,
|
||
|
|
BeginDisconnect,
|
||
|
|
Disconnected,
|
||
|
|
Hung,
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* enum p9_req_status_t - status of a request
|
||
|
|
* @REQ_STATUS_ALLOC: request has been allocated but not sent
|
||
|
|
* @REQ_STATUS_UNSENT: request waiting to be sent
|
||
|
|
* @REQ_STATUS_SENT: request sent to server
|
||
|
|
* @REQ_STATUS_RCVD: response received from server
|
||
|
|
* @REQ_STATUS_FLSHD: request has been flushed
|
||
|
|
* @REQ_STATUS_ERROR: request encountered an error on the client side
|
||
|
|
*/
|
||
|
|
|
||
|
|
enum p9_req_status_t {
|
||
|
|
REQ_STATUS_ALLOC,
|
||
|
|
REQ_STATUS_UNSENT,
|
||
|
|
REQ_STATUS_SENT,
|
||
|
|
REQ_STATUS_RCVD,
|
||
|
|
REQ_STATUS_FLSHD,
|
||
|
|
REQ_STATUS_ERROR,
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct p9_req_t - request slots
|
||
|
|
* @status: status of this request slot
|
||
|
|
* @t_err: transport error
|
||
|
|
* @wq: wait_queue for the client to block on for this request
|
||
|
|
* @tc: the request fcall structure
|
||
|
|
* @rc: the response fcall structure
|
||
|
|
* @aux: transport specific data (provided for trans_fd migration)
|
||
|
|
* @req_list: link for higher level objects to chain requests
|
||
|
|
*/
|
||
|
|
struct p9_req_t {
|
||
|
|
int status;
|
||
|
|
int t_err;
|
||
|
|
struct kref refcount;
|
||
|
|
wait_queue_head_t wq;
|
||
|
|
struct p9_fcall tc;
|
||
|
|
struct p9_fcall rc;
|
||
|
|
void *aux;
|
||
|
|
struct list_head req_list;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct p9_client - per client instance state
|
||
|
|
* @lock: protect @fids and @reqs
|
||
|
|
* @msize: maximum data size negotiated by protocol
|
||
|
|
* @proto_version: 9P protocol version to use
|
||
|
|
* @trans_mod: module API instantiated with this client
|
||
|
|
* @status: connection state
|
||
|
|
* @trans: tranport instance state and API
|
||
|
|
* @fids: All active FID handles
|
||
|
|
* @reqs: All active requests.
|
||
|
|
* @name: node name used as client id
|
||
|
|
*
|
||
|
|
* The client structure is used to keep track of various per-client
|
||
|
|
* state that has been instantiated.
|
||
|
|
*/
|
||
|
|
struct p9_client {
|
||
|
|
spinlock_t lock;
|
||
|
|
unsigned int msize;
|
||
|
|
unsigned char proto_version;
|
||
|
|
struct p9_trans_module *trans_mod;
|
||
|
|
enum p9_trans_status status;
|
||
|
|
void *trans;
|
||
|
|
struct kmem_cache *fcall_cache;
|
||
|
|
|
||
|
|
union {
|
||
|
|
struct {
|
||
|
|
int rfd;
|
||
|
|
int wfd;
|
||
|
|
} fd;
|
||
|
|
struct {
|
||
|
|
u16 port;
|
||
|
|
bool privport;
|
||
|
|
|
||
|
|
} tcp;
|
||
|
|
} trans_opts;
|
||
|
|
|
||
|
|
struct idr fids;
|
||
|
|
struct idr reqs;
|
||
|
|
|
||
|
|
char name[__NEW_UTS_LEN + 1];
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct p9_fid - file system entity handle
|
||
|
|
* @clnt: back pointer to instantiating &p9_client
|
||
|
|
* @fid: numeric identifier for this handle
|
||
|
|
* @mode: current mode of this fid (enum?)
|
||
|
|
* @qid: the &p9_qid server identifier this handle points to
|
||
|
|
* @iounit: the server reported maximum transaction size for this file
|
||
|
|
* @uid: the numeric uid of the local user who owns this handle
|
||
|
|
* @rdir: readdir accounting structure (allocated on demand)
|
||
|
|
* @dlist: per-dentry fid tracking
|
||
|
|
*
|
||
|
|
* TODO: This needs lots of explanation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct p9_fid {
|
||
|
|
struct p9_client *clnt;
|
||
|
|
u32 fid;
|
||
|
|
int mode;
|
||
|
|
struct p9_qid qid;
|
||
|
|
u32 iounit;
|
||
|
|
kuid_t uid;
|
||
|
|
|
||
|
|
void *rdir;
|
||
|
|
|
||
|
|
struct hlist_node dlist; /* list of all fids attached to a dentry */
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct p9_dirent - directory entry structure
|
||
|
|
* @qid: The p9 server qid for this dirent
|
||
|
|
* @d_off: offset to the next dirent
|
||
|
|
* @d_type: type of file
|
||
|
|
* @d_name: file name
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct p9_dirent {
|
||
|
|
struct p9_qid qid;
|
||
|
|
u64 d_off;
|
||
|
|
unsigned char d_type;
|
||
|
|
char d_name[256];
|
||
|
|
};
|
||
|
|
|
||
|
|
struct iov_iter;
|
||
|
|
|
||
|
|
int p9_show_client_options(struct seq_file *m, struct p9_client *clnt);
|
||
|
|
int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb);
|
||
|
|
int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid,
|
||
|
|
const char *name);
|
||
|
|
int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
|
||
|
|
struct p9_fid *newdirfid, const char *new_name);
|
||
|
|
struct p9_client *p9_client_create(const char *dev_name, char *options);
|
||
|
|
void p9_client_destroy(struct p9_client *clnt);
|
||
|
|
void p9_client_disconnect(struct p9_client *clnt);
|
||
|
|
void p9_client_begin_disconnect(struct p9_client *clnt);
|
||
|
|
struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
|
||
|
|
const char *uname, kuid_t n_uname, const char *aname);
|
||
|
|
struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
|
||
|
|
const unsigned char * const *wnames, int clone);
|
||
|
|
int p9_client_open(struct p9_fid *fid, int mode);
|
||
|
|
int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
|
||
|
|
char *extension);
|
||
|
|
int p9_client_link(struct p9_fid *fid, struct p9_fid *oldfid, const char *newname);
|
||
|
|
int p9_client_symlink(struct p9_fid *fid, const char *name, const char *symname,
|
||
|
|
kgid_t gid, struct p9_qid *qid);
|
||
|
|
int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
|
||
|
|
kgid_t gid, struct p9_qid *qid);
|
||
|
|
int p9_client_clunk(struct p9_fid *fid);
|
||
|
|
int p9_client_fsync(struct p9_fid *fid, int datasync);
|
||
|
|
int p9_client_remove(struct p9_fid *fid);
|
||
|
|
int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags);
|
||
|
|
int p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err);
|
||
|
|
int p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err);
|
||
|
|
int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset);
|
||
|
|
int p9dirent_read(struct p9_client *clnt, char *buf, int len,
|
||
|
|
struct p9_dirent *dirent);
|
||
|
|
struct p9_wstat *p9_client_stat(struct p9_fid *fid);
|
||
|
|
int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst);
|
||
|
|
int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *attr);
|
||
|
|
|
||
|
|
struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
|
||
|
|
u64 request_mask);
|
||
|
|
|
||
|
|
int p9_client_mknod_dotl(struct p9_fid *oldfid, const char *name, int mode,
|
||
|
|
dev_t rdev, kgid_t gid, struct p9_qid *);
|
||
|
|
int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
|
||
|
|
kgid_t gid, struct p9_qid *);
|
||
|
|
int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status);
|
||
|
|
int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *fl);
|
||
|
|
void p9_fcall_fini(struct p9_fcall *fc);
|
||
|
|
struct p9_req_t *p9_tag_lookup(struct p9_client *, u16);
|
||
|
|
|
||
|
|
static inline void p9_req_get(struct p9_req_t *r)
|
||
|
|
{
|
||
|
|
kref_get(&r->refcount);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int p9_req_try_get(struct p9_req_t *r)
|
||
|
|
{
|
||
|
|
return kref_get_unless_zero(&r->refcount);
|
||
|
|
}
|
||
|
|
|
||
|
|
int p9_req_put(struct p9_req_t *r);
|
||
|
|
|
||
|
|
void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status);
|
||
|
|
|
||
|
|
int p9_parse_header(struct p9_fcall *, int32_t *, int8_t *, int16_t *, int);
|
||
|
|
int p9stat_read(struct p9_client *, char *, int, struct p9_wstat *);
|
||
|
|
void p9stat_free(struct p9_wstat *);
|
||
|
|
|
||
|
|
int p9_is_proto_dotu(struct p9_client *clnt);
|
||
|
|
int p9_is_proto_dotl(struct p9_client *clnt);
|
||
|
|
struct p9_fid *p9_client_xattrwalk(struct p9_fid *, const char *, u64 *);
|
||
|
|
int p9_client_xattrcreate(struct p9_fid *, const char *, u64, int);
|
||
|
|
int p9_client_readlink(struct p9_fid *fid, char **target);
|
||
|
|
|
||
|
|
int p9_client_init(void);
|
||
|
|
void p9_client_exit(void);
|
||
|
|
|
||
|
|
#endif /* NET_9P_CLIENT_H */
|