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/** * 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 */