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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * include/net/9p/client.h
4 *
5 * 9P Client Definitions
6 *
7 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
9 */
10
11#ifndef NET_9P_CLIENT_H
12#define NET_9P_CLIENT_H
13
14#include <linux/utsname.h>
15#include <linux/idr.h>
16
17/* Number of requests per row */
18#define P9_ROW_MAXTAG 255
19
20/** enum p9_proto_versions - 9P protocol versions
21 * @p9_proto_legacy: 9P Legacy mode, pre-9P2000.u
22 * @p9_proto_2000u: 9P2000.u extension
23 * @p9_proto_2000L: 9P2000.L extension
24 */
25
26enum p9_proto_versions{
27 p9_proto_legacy,
28 p9_proto_2000u,
29 p9_proto_2000L,
30};
31
32
33/**
34 * enum p9_trans_status - different states of underlying transports
35 * @Connected: transport is connected and healthy
36 * @Disconnected: transport has been disconnected
37 * @Hung: transport is connected by wedged
38 *
39 * This enumeration details the various states a transport
40 * instatiation can be in.
41 */
42
43enum p9_trans_status {
44 Connected,
45 BeginDisconnect,
46 Disconnected,
47 Hung,
48};
49
50/**
51 * enum p9_req_status_t - status of a request
52 * @REQ_STATUS_ALLOC: request has been allocated but not sent
53 * @REQ_STATUS_UNSENT: request waiting to be sent
54 * @REQ_STATUS_SENT: request sent to server
55 * @REQ_STATUS_RCVD: response received from server
56 * @REQ_STATUS_FLSHD: request has been flushed
57 * @REQ_STATUS_ERROR: request encountered an error on the client side
58 */
59
60enum p9_req_status_t {
61 REQ_STATUS_ALLOC,
62 REQ_STATUS_UNSENT,
63 REQ_STATUS_SENT,
64 REQ_STATUS_RCVD,
65 REQ_STATUS_FLSHD,
66 REQ_STATUS_ERROR,
67};
68
69/**
70 * struct p9_req_t - request slots
71 * @status: status of this request slot
72 * @t_err: transport error
73 * @wq: wait_queue for the client to block on for this request
74 * @tc: the request fcall structure
75 * @rc: the response fcall structure
76 * @req_list: link for higher level objects to chain requests
77 */
78struct p9_req_t {
79 int status;
80 int t_err;
81 struct kref refcount;
82 wait_queue_head_t wq;
83 struct p9_fcall tc;
84 struct p9_fcall rc;
85 struct list_head req_list;
86};
87
88/**
89 * struct p9_client - per client instance state
90 * @lock: protect @fids and @reqs
91 * @msize: maximum data size negotiated by protocol
92 * @proto_version: 9P protocol version to use
93 * @trans_mod: module API instantiated with this client
94 * @status: connection state
95 * @trans: tranport instance state and API
96 * @fids: All active FID handles
97 * @reqs: All active requests.
98 * @name: node name used as client id
99 *
100 * The client structure is used to keep track of various per-client
101 * state that has been instantiated.
102 */
103struct p9_client {
104 spinlock_t lock;
105 unsigned int msize;
106 unsigned char proto_version;
107 struct p9_trans_module *trans_mod;
108 enum p9_trans_status status;
109 void *trans;
110 struct kmem_cache *fcall_cache;
111
112 union {
113 struct {
114 int rfd;
115 int wfd;
116 } fd;
117 struct {
118 u16 port;
119 bool privport;
120
121 } tcp;
122 } trans_opts;
123
124 struct idr fids;
125 struct idr reqs;
126
127 char name[__NEW_UTS_LEN + 1];
128};
129
130/**
131 * struct p9_fid - file system entity handle
132 * @clnt: back pointer to instantiating &p9_client
133 * @fid: numeric identifier for this handle
134 * @mode: current mode of this fid (enum?)
135 * @qid: the &p9_qid server identifier this handle points to
136 * @iounit: the server reported maximum transaction size for this file
137 * @uid: the numeric uid of the local user who owns this handle
138 * @rdir: readdir accounting structure (allocated on demand)
139 * @dlist: per-dentry fid tracking
140 *
141 * TODO: This needs lots of explanation.
142 */
143enum fid_source {
144 FID_FROM_OTHER,
145 FID_FROM_INODE,
146 FID_FROM_DENTRY,
147};
148
149struct p9_fid {
150 struct p9_client *clnt;
151 u32 fid;
152 refcount_t count;
153 int mode;
154 struct p9_qid qid;
155 u32 iounit;
156 kuid_t uid;
157
158 void *rdir;
159
160 struct hlist_node dlist; /* list of all fids attached to a dentry */
161 struct hlist_node ilist;
162};
163
164/**
165 * struct p9_dirent - directory entry structure
166 * @qid: The p9 server qid for this dirent
167 * @d_off: offset to the next dirent
168 * @d_type: type of file
169 * @d_name: file name
170 */
171
172struct p9_dirent {
173 struct p9_qid qid;
174 u64 d_off;
175 unsigned char d_type;
176 char d_name[256];
177};
178
179struct iov_iter;
180
181int p9_show_client_options(struct seq_file *m, struct p9_client *clnt);
182int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb);
183int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid,
184 const char *name);
185int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
186 struct p9_fid *newdirfid, const char *new_name);
187struct p9_client *p9_client_create(const char *dev_name, char *options);
188void p9_client_destroy(struct p9_client *clnt);
189void p9_client_disconnect(struct p9_client *clnt);
190void p9_client_begin_disconnect(struct p9_client *clnt);
191struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
192 const char *uname, kuid_t n_uname, const char *aname);
193struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
194 const unsigned char * const *wnames, int clone);
195int p9_client_open(struct p9_fid *fid, int mode);
196int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
197 char *extension);
198int p9_client_link(struct p9_fid *fid, struct p9_fid *oldfid, const char *newname);
199int p9_client_symlink(struct p9_fid *fid, const char *name, const char *symname,
200 kgid_t gid, struct p9_qid *qid);
201int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
202 kgid_t gid, struct p9_qid *qid);
203int p9_client_clunk(struct p9_fid *fid);
204int p9_client_fsync(struct p9_fid *fid, int datasync);
205int p9_client_remove(struct p9_fid *fid);
206int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags);
207int p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err);
208int p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
209 int *err);
210int p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err);
211int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset);
212int p9dirent_read(struct p9_client *clnt, char *buf, int len,
213 struct p9_dirent *dirent);
214struct p9_wstat *p9_client_stat(struct p9_fid *fid);
215int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst);
216int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *attr);
217
218struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
219 u64 request_mask);
220
221int p9_client_mknod_dotl(struct p9_fid *oldfid, const char *name, int mode,
222 dev_t rdev, kgid_t gid, struct p9_qid *);
223int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
224 kgid_t gid, struct p9_qid *);
225int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status);
226int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *fl);
227void p9_fcall_fini(struct p9_fcall *fc);
228struct p9_req_t *p9_tag_lookup(struct p9_client *, u16);
229
230static inline void p9_req_get(struct p9_req_t *r)
231{
232 kref_get(&r->refcount);
233}
234
235static inline int p9_req_try_get(struct p9_req_t *r)
236{
237 return kref_get_unless_zero(&r->refcount);
238}
239
240int p9_req_put(struct p9_req_t *r);
241
242void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status);
243
244int p9_parse_header(struct p9_fcall *, int32_t *, int8_t *, int16_t *, int);
245int p9stat_read(struct p9_client *, char *, int, struct p9_wstat *);
246void p9stat_free(struct p9_wstat *);
247
248int p9_is_proto_dotu(struct p9_client *clnt);
249int p9_is_proto_dotl(struct p9_client *clnt);
250struct p9_fid *p9_client_xattrwalk(struct p9_fid *, const char *, u64 *);
251int p9_client_xattrcreate(struct p9_fid *, const char *, u64, int);
252int p9_client_readlink(struct p9_fid *fid, char **target);
253
254int p9_client_init(void);
255void p9_client_exit(void);
256
257#endif /* NET_9P_CLIENT_H */
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * 9P Client Definitions
4 *
5 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
7 */
8
9#ifndef NET_9P_CLIENT_H
10#define NET_9P_CLIENT_H
11
12#include <linux/utsname.h>
13#include <linux/idr.h>
14#include <linux/tracepoint-defs.h>
15
16/* Number of requests per row */
17#define P9_ROW_MAXTAG 255
18
19/** enum p9_proto_versions - 9P protocol versions
20 * @p9_proto_legacy: 9P Legacy mode, pre-9P2000.u
21 * @p9_proto_2000u: 9P2000.u extension
22 * @p9_proto_2000L: 9P2000.L extension
23 */
24
25enum p9_proto_versions {
26 p9_proto_legacy,
27 p9_proto_2000u,
28 p9_proto_2000L,
29};
30
31
32/**
33 * enum p9_trans_status - different states of underlying transports
34 * @Connected: transport is connected and healthy
35 * @Disconnected: transport has been disconnected
36 * @Hung: transport is connected by wedged
37 *
38 * This enumeration details the various states a transport
39 * instatiation can be in.
40 */
41
42enum p9_trans_status {
43 Connected,
44 BeginDisconnect,
45 Disconnected,
46 Hung,
47};
48
49/**
50 * enum p9_req_status_t - status of a request
51 * @REQ_STATUS_ALLOC: request has been allocated but not sent
52 * @REQ_STATUS_UNSENT: request waiting to be sent
53 * @REQ_STATUS_SENT: request sent to server
54 * @REQ_STATUS_RCVD: response received from server
55 * @REQ_STATUS_FLSHD: request has been flushed
56 * @REQ_STATUS_ERROR: request encountered an error on the client side
57 */
58
59enum p9_req_status_t {
60 REQ_STATUS_ALLOC,
61 REQ_STATUS_UNSENT,
62 REQ_STATUS_SENT,
63 REQ_STATUS_RCVD,
64 REQ_STATUS_FLSHD,
65 REQ_STATUS_ERROR,
66};
67
68/**
69 * struct p9_req_t - request slots
70 * @status: status of this request slot
71 * @t_err: transport error
72 * @wq: wait_queue for the client to block on for this request
73 * @tc: the request fcall structure
74 * @rc: the response fcall structure
75 * @req_list: link for higher level objects to chain requests
76 */
77struct p9_req_t {
78 int status;
79 int t_err;
80 refcount_t refcount;
81 wait_queue_head_t wq;
82 struct p9_fcall tc;
83 struct p9_fcall rc;
84 struct list_head req_list;
85};
86
87/**
88 * struct p9_client - per client instance state
89 * @lock: protect @fids and @reqs
90 * @msize: maximum data size negotiated by protocol
91 * @proto_version: 9P protocol version to use
92 * @trans_mod: module API instantiated with this client
93 * @status: connection state
94 * @trans: tranport instance state and API
95 * @fids: All active FID handles
96 * @reqs: All active requests.
97 * @name: node name used as client id
98 *
99 * The client structure is used to keep track of various per-client
100 * state that has been instantiated.
101 */
102struct p9_client {
103 spinlock_t lock;
104 unsigned int msize;
105 unsigned char proto_version;
106 struct p9_trans_module *trans_mod;
107 enum p9_trans_status status;
108 void *trans;
109 struct kmem_cache *fcall_cache;
110
111 union {
112 struct {
113 int rfd;
114 int wfd;
115 } fd;
116 struct {
117 u16 port;
118 bool privport;
119
120 } tcp;
121 } trans_opts;
122
123 struct idr fids;
124 struct idr reqs;
125
126 char name[__NEW_UTS_LEN + 1];
127};
128
129/**
130 * struct p9_fid - file system entity handle
131 * @clnt: back pointer to instantiating &p9_client
132 * @fid: numeric identifier for this handle
133 * @mode: current mode of this fid (enum?)
134 * @qid: the &p9_qid server identifier this handle points to
135 * @iounit: the server reported maximum transaction size for this file
136 * @uid: the numeric uid of the local user who owns this handle
137 * @rdir: readdir accounting structure (allocated on demand)
138 * @dlist: per-dentry fid tracking
139 *
140 * TODO: This needs lots of explanation.
141 */
142enum fid_source {
143 FID_FROM_OTHER,
144 FID_FROM_INODE,
145 FID_FROM_DENTRY,
146};
147
148struct p9_fid {
149 struct p9_client *clnt;
150 u32 fid;
151 refcount_t count;
152 int mode;
153 struct p9_qid qid;
154 u32 iounit;
155 kuid_t uid;
156
157 void *rdir;
158
159 struct hlist_node dlist; /* list of all fids attached to a dentry */
160 struct hlist_node ilist;
161};
162
163/**
164 * struct p9_dirent - directory entry structure
165 * @qid: The p9 server qid for this dirent
166 * @d_off: offset to the next dirent
167 * @d_type: type of file
168 * @d_name: file name
169 */
170
171struct p9_dirent {
172 struct p9_qid qid;
173 u64 d_off;
174 unsigned char d_type;
175 char d_name[256];
176};
177
178struct iov_iter;
179
180int p9_show_client_options(struct seq_file *m, struct p9_client *clnt);
181int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb);
182int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid,
183 const char *name);
184int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
185 struct p9_fid *newdirfid, const char *new_name);
186struct p9_client *p9_client_create(const char *dev_name, char *options);
187void p9_client_destroy(struct p9_client *clnt);
188void p9_client_disconnect(struct p9_client *clnt);
189void p9_client_begin_disconnect(struct p9_client *clnt);
190struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
191 const char *uname, kuid_t n_uname, const char *aname);
192struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
193 const unsigned char * const *wnames, int clone);
194int p9_client_open(struct p9_fid *fid, int mode);
195int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
196 char *extension);
197int p9_client_link(struct p9_fid *fid, struct p9_fid *oldfid, const char *newname);
198int p9_client_symlink(struct p9_fid *fid, const char *name, const char *symname,
199 kgid_t gid, struct p9_qid *qid);
200int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
201 kgid_t gid, struct p9_qid *qid);
202int p9_client_clunk(struct p9_fid *fid);
203int p9_client_fsync(struct p9_fid *fid, int datasync);
204int p9_client_remove(struct p9_fid *fid);
205int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags);
206int p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err);
207int p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
208 int *err);
209int p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err);
210int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset);
211int p9dirent_read(struct p9_client *clnt, char *buf, int len,
212 struct p9_dirent *dirent);
213struct p9_wstat *p9_client_stat(struct p9_fid *fid);
214int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst);
215int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *attr);
216
217struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
218 u64 request_mask);
219
220int p9_client_mknod_dotl(struct p9_fid *oldfid, const char *name, int mode,
221 dev_t rdev, kgid_t gid, struct p9_qid *qid);
222int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
223 kgid_t gid, struct p9_qid *qid);
224int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status);
225int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *fl);
226void p9_fcall_fini(struct p9_fcall *fc);
227struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag);
228
229static inline void p9_req_get(struct p9_req_t *r)
230{
231 refcount_inc(&r->refcount);
232}
233
234static inline int p9_req_try_get(struct p9_req_t *r)
235{
236 return refcount_inc_not_zero(&r->refcount);
237}
238
239int p9_req_put(struct p9_client *c, struct p9_req_t *r);
240
241/* We cannot have the real tracepoints in header files,
242 * use a wrapper function */
243DECLARE_TRACEPOINT(9p_fid_ref);
244void do_trace_9p_fid_get(struct p9_fid *fid);
245void do_trace_9p_fid_put(struct p9_fid *fid);
246
247/* fid reference counting helpers:
248 * - fids used for any length of time should always be referenced through
249 * p9_fid_get(), and released with p9_fid_put()
250 * - v9fs_fid_lookup() or similar will automatically call get for you
251 * and also require a put
252 * - the *_fid_add() helpers will stash the fid in the inode,
253 * at which point it is the responsibility of evict_inode()
254 * to call the put
255 * - the last put will automatically send a clunk to the server
256 */
257static inline struct p9_fid *p9_fid_get(struct p9_fid *fid)
258{
259 if (tracepoint_enabled(9p_fid_ref))
260 do_trace_9p_fid_get(fid);
261
262 refcount_inc(&fid->count);
263
264 return fid;
265}
266
267static inline int p9_fid_put(struct p9_fid *fid)
268{
269 if (!fid || IS_ERR(fid))
270 return 0;
271
272 if (tracepoint_enabled(9p_fid_ref))
273 do_trace_9p_fid_put(fid);
274
275 if (!refcount_dec_and_test(&fid->count))
276 return 0;
277
278 return p9_client_clunk(fid);
279}
280
281void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status);
282
283int p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type,
284 int16_t *tag, int rewind);
285int p9stat_read(struct p9_client *clnt, char *buf, int len,
286 struct p9_wstat *st);
287void p9stat_free(struct p9_wstat *stbuf);
288
289int p9_is_proto_dotu(struct p9_client *clnt);
290int p9_is_proto_dotl(struct p9_client *clnt);
291struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
292 const char *attr_name, u64 *attr_size);
293int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
294 u64 attr_size, int flags);
295int p9_client_readlink(struct p9_fid *fid, char **target);
296
297int p9_client_init(void);
298void p9_client_exit(void);
299
300#endif /* NET_9P_CLIENT_H */