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fs/9p: Update zero-copy implementation in 9p

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* remove lot of update to different data structure
* add a seperate callback for zero copy request.
* above makes non zero copy code path simpler
* remove conditionalizing TREAD/TREADDIR/TWRITE in the zero copy path
* Fix the dotu p9_check_errors with zero copy. Add sufficient doc around
* Add support for both in and output buffers in zero copy callback
* pin and unpin pages in the same context
* use helpers instead of defining page offset and rest of page ourself
* Fix mem leak in p9_check_errors
* Remove 'E' and 'F' in p9pdu_vwritef

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Aneesh Kumar K.V
2011-08-16 10:50:10 +05:30
committed by Eric Van Hensbergen
parent c3b92c8787
commit abfa034e4b
9 changed files with 522 additions and 364 deletions
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11
include/net/9p/9p.h
View File

@@ -359,6 +359,9 @@ enum p9_qid_t {
/* Room for readdir header */
#define P9_READDIRHDRSZ 24
/* size of header for zero copy read/write */
#define P9_ZC_HDR_SZ 4096
/**
* struct p9_qid - file system entity information
* @type: 8-bit type &p9_qid_t
@@ -555,10 +558,6 @@ struct p9_rstatfs {
* @tag: transaction id of the request
* @offset: used by marshalling routines to track current position in buffer
* @capacity: used by marshalling routines to track total malloc'd capacity
* @pubuf: Payload user buffer given by the caller
* @pkbuf: Payload kernel buffer given by the caller
* @pbuf_size: pubuf/pkbuf(only one will be !NULL) size to be read/write.
* @private: For transport layer's use.
* @sdata: payload
*
* &p9_fcall represents the structure for all 9P RPC
@@ -575,10 +574,6 @@ struct p9_fcall {
size_t offset;
size_t capacity;
char __user *pubuf;
char *pkbuf;
size_t pbuf_size;
void *private;
u8 *sdata;
};

10
include/net/9p/transport.h
View File

@@ -26,13 +26,6 @@
#ifndef NET_9P_TRANSPORT_H
#define NET_9P_TRANSPORT_H
#define P9_TRANS_PREF_PAYLOAD_MASK 0x1
/* Default. Add Payload to PDU before sending it down to transport layer */
#define P9_TRANS_PREF_PAYLOAD_DEF 0x0
/* Send pay load separately to transport layer along with PDU.*/
#define P9_TRANS_PREF_PAYLOAD_SEP 0x1
/**
* struct p9_trans_module - transport module interface
* @list: used to maintain a list of currently available transports
@@ -56,13 +49,14 @@ struct p9_trans_module {
struct list_head list;
char *name; /* name of transport */
int maxsize; /* max message size of transport */
int pref; /* Preferences of this transport */
int def; /* this transport should be default */
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);
int (*zc_request)(struct p9_client *, struct p9_req_t *,
char *, char *, int , int, int, int);
};
void v9fs_register_trans(struct p9_trans_module *m);