272 строки
9.0 KiB
C
272 строки
9.0 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to:
|
|
* Free Software Foundation
|
|
* 51 Franklin Street, Fifth Floor
|
|
* Boston, MA 02111-1301 USA
|
|
*
|
|
*/
|
|
|
|
#ifndef NET_9P_CLIENT_H
|
|
#define NET_9P_CLIENT_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_IDLE: request slot unused
|
|
* @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_FLSH: a flush has been sent for this request
|
|
* @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
|
|
*
|
|
* The @REQ_STATUS_IDLE state is used to mark a request slot as unused
|
|
* but use is actually tracked by the idpool structure which handles tag
|
|
* id allocation.
|
|
*
|
|
*/
|
|
|
|
enum p9_req_status_t {
|
|
REQ_STATUS_IDLE,
|
|
REQ_STATUS_ALLOC,
|
|
REQ_STATUS_UNSENT,
|
|
REQ_STATUS_SENT,
|
|
REQ_STATUS_FLSH,
|
|
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
|
|
* @flush_tag: tag of request being flushed (for flush requests)
|
|
* @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
|
|
*
|
|
* Transport use an array to track outstanding requests
|
|
* instead of a list. While this may incurr overhead during initial
|
|
* allocation or expansion, it makes request lookup much easier as the
|
|
* tag id is a index into an array. (We use tag+1 so that we can accommodate
|
|
* the -1 tag for the T_VERSION request).
|
|
* This also has the nice effect of only having to allocate wait_queues
|
|
* once, instead of constantly allocating and freeing them. Its possible
|
|
* other resources could benefit from this scheme as well.
|
|
*
|
|
*/
|
|
|
|
struct p9_req_t {
|
|
int status;
|
|
int t_err;
|
|
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 @fidlist
|
|
* @msize: maximum data size negotiated by protocol
|
|
* @dotu: extension flags negotiated by protocol
|
|
* @proto_version: 9P protocol version to use
|
|
* @trans_mod: module API instantiated with this client
|
|
* @trans: tranport instance state and API
|
|
* @conn: connection state information used by trans_fd
|
|
* @fidpool: fid handle accounting for session
|
|
* @fidlist: List of active fid handles
|
|
* @tagpool - transaction id accounting for session
|
|
* @reqs - 2D array of requests
|
|
* @max_tag - current maximum tag id allocated
|
|
*
|
|
* The client structure is used to keep track of various per-client
|
|
* state that has been instantiated.
|
|
* In order to minimize per-transaction overhead we use a
|
|
* simple array to lookup requests instead of a hash table
|
|
* or linked list. In order to support larger number of
|
|
* transactions, we make this a 2D array, allocating new rows
|
|
* when we need to grow the total number of the transactions.
|
|
*
|
|
* Each row is 256 requests and we'll support up to 256 rows for
|
|
* a total of 64k concurrent requests per session.
|
|
*
|
|
* Bugs: duplicated data and potentially unnecessary elements.
|
|
*/
|
|
|
|
struct p9_client {
|
|
spinlock_t lock; /* protect client structure */
|
|
unsigned int msize;
|
|
unsigned char proto_version;
|
|
struct p9_trans_module *trans_mod;
|
|
enum p9_trans_status status;
|
|
void *trans;
|
|
struct p9_conn *conn;
|
|
|
|
struct p9_idpool *fidpool;
|
|
struct list_head fidlist;
|
|
|
|
struct p9_idpool *tagpool;
|
|
struct p9_req_t *reqs[P9_ROW_MAXTAG];
|
|
int max_tag;
|
|
};
|
|
|
|
/**
|
|
* 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)
|
|
* @flist: per-client-instance fid tracking
|
|
* @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 list_head flist;
|
|
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];
|
|
};
|
|
|
|
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,
|
|
char *uname, kuid_t n_uname, char *aname);
|
|
struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
|
|
char **wnames, int clone);
|
|
int p9_client_open(struct p9_fid *fid, int mode);
|
|
int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
|
|
char *extension);
|
|
int p9_client_link(struct p9_fid *fid, struct p9_fid *oldfid, char *newname);
|
|
int p9_client_symlink(struct p9_fid *fid, char *name, char *symname, kgid_t gid,
|
|
struct p9_qid *qid);
|
|
int p9_client_create_dotl(struct p9_fid *ofid, 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, char *data, char __user *udata,
|
|
u64 offset, u32 count);
|
|
int p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
|
|
u64 offset, u32 count);
|
|
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, char *name, int mode,
|
|
dev_t rdev, kgid_t gid, struct p9_qid *);
|
|
int p9_client_mkdir_dotl(struct p9_fid *fid, 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);
|
|
struct p9_req_t *p9_tag_lookup(struct p9_client *, u16);
|
|
void p9_client_cb(struct p9_client *c, struct p9_req_t *req);
|
|
|
|
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);
|
|
|
|
#endif /* NET_9P_CLIENT_H */
|