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 26 enum 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 43 enum 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 60 enum 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 */ 78 struct 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 */ 103 struct 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 */ 143 enum fid_source { 144 FID_FROM_OTHER, 145 FID_FROM_INODE, 146 FID_FROM_DENTRY, 147 }; 148 149 struct 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 */ 171 172 struct p9_dirent { 173 struct p9_qid qid; 174 u64 d_off; 175 unsigned char d_type; 176 char d_name[256]; 177 }; 178 179 struct iov_iter; 180 181 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt); 182 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb); 183 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, 184 const char *name); 185 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 186 struct p9_fid *newdirfid, const char *new_name); 187 struct p9_client *p9_client_create(const char *dev_name, char *options); 188 void p9_client_destroy(struct p9_client *clnt); 189 void p9_client_disconnect(struct p9_client *clnt); 190 void p9_client_begin_disconnect(struct p9_client *clnt); 191 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 192 const char *uname, kuid_t n_uname, const char *aname); 193 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 194 const unsigned char * const *wnames, int clone); 195 int p9_client_open(struct p9_fid *fid, int mode); 196 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 197 char *extension); 198 int p9_client_link(struct p9_fid *fid, struct p9_fid *oldfid, const char *newname); 199 int p9_client_symlink(struct p9_fid *fid, const char *name, const char *symname, 200 kgid_t gid, struct p9_qid *qid); 201 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 202 kgid_t gid, struct p9_qid *qid); 203 int p9_client_clunk(struct p9_fid *fid); 204 int p9_client_fsync(struct p9_fid *fid, int datasync); 205 int p9_client_remove(struct p9_fid *fid); 206 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags); 207 int p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err); 208 int p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 209 int *err); 210 int p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err); 211 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset); 212 int p9dirent_read(struct p9_client *clnt, char *buf, int len, 213 struct p9_dirent *dirent); 214 struct p9_wstat *p9_client_stat(struct p9_fid *fid); 215 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst); 216 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *attr); 217 218 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 219 u64 request_mask); 220 221 int p9_client_mknod_dotl(struct p9_fid *oldfid, const char *name, int mode, 222 dev_t rdev, kgid_t gid, struct p9_qid *); 223 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 224 kgid_t gid, struct p9_qid *); 225 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status); 226 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *fl); 227 void p9_fcall_fini(struct p9_fcall *fc); 228 struct p9_req_t *p9_tag_lookup(struct p9_client *, u16); 229 230 static inline void p9_req_get(struct p9_req_t *r) 231 { 232 kref_get(&r->refcount); 233 } 234 235 static inline int p9_req_try_get(struct p9_req_t *r) 236 { 237 return kref_get_unless_zero(&r->refcount); 238 } 239 240 int p9_req_put(struct p9_req_t *r); 241 242 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status); 243 244 int p9_parse_header(struct p9_fcall *, int32_t *, int8_t *, int16_t *, int); 245 int p9stat_read(struct p9_client *, char *, int, struct p9_wstat *); 246 void p9stat_free(struct p9_wstat *); 247 248 int p9_is_proto_dotu(struct p9_client *clnt); 249 int p9_is_proto_dotl(struct p9_client *clnt); 250 struct p9_fid *p9_client_xattrwalk(struct p9_fid *, const char *, u64 *); 251 int p9_client_xattrcreate(struct p9_fid *, const char *, u64, int); 252 int p9_client_readlink(struct p9_fid *fid, char **target); 253 254 int p9_client_init(void); 255 void p9_client_exit(void); 256 257 #endif /* NET_9P_CLIENT_H */ 258