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authorLinus Torvalds <torvalds@linux-foundation.org>2008-10-20 09:39:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-20 09:39:47 -0700
commit45e4a24f7b6b23810142112b5850fe75696a1155 (patch)
treec6a46c3d19a0406b477240ecae7a41886c9ad7d0 /include
parent52c6738b7f46255217942062dfa60daa7cf72510 (diff)
parent7eb923b80c8ce16697129fb2dcdfaeabf83f0dbc (diff)
downloadlinux-45e4a24f7b6b23810142112b5850fe75696a1155.tar.bz2
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs
* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs: (26 commits) 9p: add more conservative locking 9p: fix oops in protocol stat parsing error path. 9p: fix device file handling 9p: Improve debug support 9p: eliminate depricated conv functions 9p: rework client code to use new protocol support functions 9p: remove unnecessary tag field from p9_req_t structure 9p: remove 9p fcall debug prints 9p: add new protocol support code 9p: encapsulate version function 9p: move dirread to fs layer 9p: adjust 9p vfs write operation 9p: move readn meta-function from client to fs layer 9p: consolidate read/write functions 9p: drop broken unused error path from p9_conn_create() 9p: make rpc code common and rework flush code 9p: use the rcall structure passed in the request in trans_fd read_work 9p: apply common request code to trans_fd 9p: apply common tagpool handling to trans_fd 9p: move request management to client code ...
Diffstat (limited to 'include')
-rw-r--r--include/net/9p/9p.h119
-rw-r--r--include/net/9p/client.h124
-rw-r--r--include/net/9p/transport.h55
3 files changed, 138 insertions, 160 deletions
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index fb163e2e0de6..d2c60c73619d 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -27,8 +27,6 @@
#ifndef NET_9P_H
#define NET_9P_H
-#ifdef CONFIG_NET_9P_DEBUG
-
/**
* enum p9_debug_flags - bits for mount time debug parameter
* @P9_DEBUG_ERROR: more verbose error messages including original error string
@@ -39,6 +37,7 @@
* @P9_DEBUG_TRANS: transport tracing
* @P9_DEBUG_SLABS: memory management tracing
* @P9_DEBUG_FCALL: verbose dump of protocol messages
+ * @P9_DEBUG_FID: fid allocation/deallocation tracking
*
* These flags are passed at mount time to turn on various levels of
* verbosity and tracing which will be output to the system logs.
@@ -53,24 +52,27 @@ enum p9_debug_flags {
P9_DEBUG_TRANS = (1<<6),
P9_DEBUG_SLABS = (1<<7),
P9_DEBUG_FCALL = (1<<8),
+ P9_DEBUG_FID = (1<<9),
+ P9_DEBUG_PKT = (1<<10),
};
extern unsigned int p9_debug_level;
+#ifdef CONFIG_NET_9P_DEBUG
#define P9_DPRINTK(level, format, arg...) \
do { \
- if ((p9_debug_level & level) == level) \
- printk(KERN_NOTICE "-- %s (%d): " \
- format , __func__, task_pid_nr(current) , ## arg); \
+ if ((p9_debug_level & level) == level) {\
+ if (level == P9_DEBUG_9P) \
+ printk(KERN_NOTICE "(%8.8d) " \
+ format , task_pid_nr(current) , ## arg); \
+ else \
+ printk(KERN_NOTICE "-- %s (%d): " \
+ format , __func__, task_pid_nr(current) , ## arg); \
+ } \
} while (0)
-#define PRINT_FCALL_ERROR(s, fcall) P9_DPRINTK(P9_DEBUG_ERROR, \
- "%s: %.*s\n", s, fcall?fcall->params.rerror.error.len:0, \
- fcall?fcall->params.rerror.error.str:"");
-
#else
#define P9_DPRINTK(level, format, arg...) do { } while (0)
-#define PRINT_FCALL_ERROR(s, fcall) do { } while (0)
#endif
#define P9_EPRINTK(level, format, arg...) \
@@ -325,33 +327,6 @@ struct p9_qid {
* See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
*/
-struct p9_stat {
- u16 size;
- u16 type;
- u32 dev;
- struct p9_qid qid;
- u32 mode;
- u32 atime;
- u32 mtime;
- u64 length;
- struct p9_str name;
- struct p9_str uid;
- struct p9_str gid;
- struct p9_str muid;
- struct p9_str extension; /* 9p2000.u extensions */
- u32 n_uid; /* 9p2000.u extensions */
- u32 n_gid; /* 9p2000.u extensions */
- u32 n_muid; /* 9p2000.u extensions */
-};
-
-/*
- * file metadata (stat) structure used to create Twstat message
- * The is identical to &p9_stat, but the strings don't point to
- * the same memory block and should be freed separately
- *
- * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
- */
-
struct p9_wstat {
u16 size;
u16 type;
@@ -493,12 +468,12 @@ struct p9_tstat {
};
struct p9_rstat {
- struct p9_stat stat;
+ struct p9_wstat stat;
};
struct p9_twstat {
u32 fid;
- struct p9_stat stat;
+ struct p9_wstat stat;
};
struct p9_rwstat {
@@ -509,8 +484,9 @@ struct p9_rwstat {
* @size: prefixed length of the structure
* @id: protocol operating identifier of type &p9_msg_t
* @tag: transaction id of the request
+ * @offset: used by marshalling routines to track currentposition in buffer
+ * @capacity: used by marshalling routines to track total capacity
* @sdata: payload
- * @params: per-operation parameters
*
* &p9_fcall represents the structure for all 9P RPC
* transactions. Requests are packaged into fcalls, and reponses
@@ -523,68 +499,15 @@ struct p9_fcall {
u32 size;
u8 id;
u16 tag;
- void *sdata;
-
- union {
- struct p9_tversion tversion;
- struct p9_rversion rversion;
- struct p9_tauth tauth;
- struct p9_rauth rauth;
- struct p9_rerror rerror;
- struct p9_tflush tflush;
- struct p9_rflush rflush;
- struct p9_tattach tattach;
- struct p9_rattach rattach;
- struct p9_twalk twalk;
- struct p9_rwalk rwalk;
- struct p9_topen topen;
- struct p9_ropen ropen;
- struct p9_tcreate tcreate;
- struct p9_rcreate rcreate;
- struct p9_tread tread;
- struct p9_rread rread;
- struct p9_twrite twrite;
- struct p9_rwrite rwrite;
- struct p9_tclunk tclunk;
- struct p9_rclunk rclunk;
- struct p9_tremove tremove;
- struct p9_rremove rremove;
- struct p9_tstat tstat;
- struct p9_rstat rstat;
- struct p9_twstat twstat;
- struct p9_rwstat rwstat;
- } params;
+
+ size_t offset;
+ size_t capacity;
+
+ uint8_t *sdata;
};
struct p9_idpool;
-int p9_deserialize_stat(void *buf, u32 buflen, struct p9_stat *stat,
- int dotu);
-int p9_deserialize_fcall(void *buf, u32 buflen, struct p9_fcall *fc, int dotu);
-void p9_set_tag(struct p9_fcall *fc, u16 tag);
-struct p9_fcall *p9_create_tversion(u32 msize, char *version);
-struct p9_fcall *p9_create_tattach(u32 fid, u32 afid, char *uname,
- char *aname, u32 n_uname, int dotu);
-struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname,
- u32 n_uname, int dotu);
-struct p9_fcall *p9_create_tflush(u16 oldtag);
-struct p9_fcall *p9_create_twalk(u32 fid, u32 newfid, u16 nwname,
- char **wnames);
-struct p9_fcall *p9_create_topen(u32 fid, u8 mode);
-struct p9_fcall *p9_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
- char *extension, int dotu);
-struct p9_fcall *p9_create_tread(u32 fid, u64 offset, u32 count);
-struct p9_fcall *p9_create_twrite(u32 fid, u64 offset, u32 count,
- const char *data);
-struct p9_fcall *p9_create_twrite_u(u32 fid, u64 offset, u32 count,
- const char __user *data);
-struct p9_fcall *p9_create_tclunk(u32 fid);
-struct p9_fcall *p9_create_tremove(u32 fid);
-struct p9_fcall *p9_create_tstat(u32 fid);
-struct p9_fcall *p9_create_twstat(u32 fid, struct p9_wstat *wstat,
- int dotu);
-
-int p9_printfcall(char *buf, int buflen, struct p9_fcall *fc, int dotu);
int p9_errstr2errno(char *errstr, int len);
struct p9_idpool *p9_idpool_create(void);
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index c936dd14de41..1f17f3d93727 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -26,6 +26,87 @@
#ifndef NET_9P_CLIENT_H
#define NET_9P_CLIENT_H
+/* Number of requests per row */
+#define P9_ROW_MAXTAG 255
+
+/**
+ * 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,
+ Disconnected,
+ Hung,
+};
+
+/**
+ * enum p9_req_status_t - virtio request status
+ * @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 accomodate
+ * 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;
+ u16 flush_tag;
+ 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
@@ -36,9 +117,20 @@
* @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.
*/
@@ -48,11 +140,16 @@ struct p9_client {
int msize;
unsigned char dotu;
struct p9_trans_module *trans_mod;
- struct p9_trans *trans;
+ 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;
};
/**
@@ -65,8 +162,6 @@ struct p9_client {
* @uid: the numeric uid of the local user who owns this handle
* @aux: transport specific information (unused?)
* @rdir_fpos: tracks offset of file position when reading directory contents
- * @rdir_pos: (unused?)
- * @rdir_fcall: holds response of last directory read request
* @flist: per-client-instance fid tracking
* @dlist: per-dentry fid tracking
*
@@ -83,8 +178,6 @@ struct p9_fid {
void *aux;
int rdir_fpos;
- int rdir_pos;
- struct p9_fcall *rdir_fcall;
struct list_head flist;
struct list_head dlist; /* list of all fids attached to a dentry */
};
@@ -103,15 +196,18 @@ int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
char *extension);
int p9_client_clunk(struct p9_fid *fid);
int p9_client_remove(struct p9_fid *fid);
-int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count);
-int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count);
-int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count);
-int p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset,
- u32 count);
-int p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset,
- u32 count);
-struct p9_stat *p9_client_stat(struct p9_fid *fid);
+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);
+struct p9_wstat *p9_client_stat(struct p9_fid *fid);
int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst);
-struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset);
+
+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 p9stat_read(char *, int, struct p9_wstat *, int);
+void p9stat_free(struct p9_wstat *);
+
#endif /* NET_9P_CLIENT_H */
diff --git a/include/net/9p/transport.h b/include/net/9p/transport.h
index 3ca737120a90..6d5886efb102 100644
--- a/include/net/9p/transport.h
+++ b/include/net/9p/transport.h
@@ -26,52 +26,6 @@
#ifndef NET_9P_TRANSPORT_H
#define NET_9P_TRANSPORT_H
-#include <linux/module.h>
-
-/**
- * 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,
- Disconnected,
- Hung,
-};
-
-/**
- * struct p9_trans - per-transport state and API
- * @status: transport &p9_trans_status
- * @msize: negotiated maximum packet size (duplicate from client)
- * @extended: negotiated protocol extensions (duplicate from client)
- * @priv: transport private data
- * @close: member function to disconnect and close the transport
- * @rpc: member function to issue a request to the transport
- *
- * This is the basic API for a transport instance. It is used as
- * a handle by the client to issue requests. This interface is currently
- * in flux during reorganization.
- *
- * Bugs: there is lots of duplicated data here and its not clear that
- * the member functions need to be per-instance versus per transport
- * module.
- */
-
-struct p9_trans {
- enum p9_trans_status status;
- int msize;
- unsigned char extended;
- void *priv;
- void (*close) (struct p9_trans *);
- int (*rpc) (struct p9_trans *t, struct p9_fcall *tc,
- struct p9_fcall **rc);
-};
-
/**
* struct p9_trans_module - transport module interface
* @list: used to maintain a list of currently available transports
@@ -79,12 +33,14 @@ struct p9_trans {
* @maxsize: transport provided maximum packet size
* @def: set if this transport should be considered the default
* @create: member function to create a new connection on this transport
+ * @request: member function to issue a request to the transport
+ * @cancel: member function to cancel a request (if it hasn't been sent)
*
* This is the basic API for a transport module which is registered by the
* transport module with the 9P core network module and used by the client
* to instantiate a new connection on a transport.
*
- * Bugs: the transport module list isn't protected.
+ * BUGS: the transport module list isn't protected.
*/
struct p9_trans_module {
@@ -92,8 +48,11 @@ struct p9_trans_module {
char *name; /* name of transport */
int maxsize; /* max message size of transport */
int def; /* this transport should be default */
- struct p9_trans * (*create)(const char *, char *, int, unsigned char);
struct module *owner;
+ int (*create)(struct p9_client *, const char *, char *);
+ void (*close) (struct p9_client *);
+ int (*request) (struct p9_client *, struct p9_req_t *req);
+ int (*cancel) (struct p9_client *, struct p9_req_t *req);
};
void v9fs_register_trans(struct p9_trans_module *m);