New multiplexer implementation. Decreases the number of kernel threads
required. Better handling when the user process receives a signal.
Signed-off-by: Latchesar Ionkov <[email protected]>
---
fs/9p/9p.c | 68 ++-
fs/9p/9p.h | 9
fs/9p/conv.c | 86 ++--
fs/9p/conv.h | 13 -
fs/9p/fid.c | 2
fs/9p/mux.c | 1136 +++++++++++++++++++++++++++++++++++++---------------
fs/9p/mux.h | 46 +-
fs/9p/trans_fd.c | 49 ++
fs/9p/trans_sock.c | 163 +++++--
fs/9p/transport.h | 4
fs/9p/v9fs.c | 41 +-
fs/9p/v9fs.h | 17 -
fs/9p/vfs_dentry.c | 13 -
fs/9p/vfs_dir.c | 17 -
fs/9p/vfs_inode.c | 89 ++--
fs/9p/vfs_super.c | 3
16 files changed, 1184 insertions(+), 572 deletions(-)
9dbba8fb15d40900ef639a85b5c1e8ade604917e
diff --git a/fs/9p/9p.c b/fs/9p/9p.c
index e847f50..7831b9b 100644
--- a/fs/9p/9p.c
+++ b/fs/9p/9p.c
@@ -52,10 +52,11 @@ v9fs_t_version(struct v9fs_session_info
dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version);
msg.id = TVERSION;
+ msg.tag = ~0;
msg.params.tversion.msize = msize;
msg.params.tversion.version = version;
- return v9fs_mux_rpc(v9ses, &msg, fcall);
+ return v9fs_mux_rpc(v9ses->mux, &msg, fcall);
}
/**
@@ -83,7 +84,30 @@ v9fs_t_attach(struct v9fs_session_info *
msg.params.tattach.uname = uname;
msg.params.tattach.aname = aname;
- return v9fs_mux_rpc(v9ses, &msg, fcall);
+ return v9fs_mux_rpc(v9ses->mux, &msg, fcall);
+}
+
+static void v9fs_t_clunk_cb(void *a, struct v9fs_fcall *tc,
+ struct v9fs_fcall *rc, int err)
+{
+ int fid;
+ struct v9fs_session_info *v9ses;
+
+ if (err)
+ return;
+
+ fid = tc->params.tclunk.fid;
+ kfree(tc);
+
+ if (!rc)
+ return;
+
+ dprintk(DEBUG_9P, "tcall id %d rcall id %d\n", tc->id, rc->id);
+ v9ses = a;
+ if (rc->id == RCLUNK)
+ v9fs_put_idpool(fid, &v9ses->fidpool);
+
+ kfree(rc);
}
/**
@@ -93,18 +117,24 @@ v9fs_t_attach(struct v9fs_session_info *
* @fcall: pointer to response fcall pointer
*
*/
-
int
-v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid,
- struct v9fs_fcall **fcall)
+v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid)
{
- struct v9fs_fcall msg;
+ int err;
+ struct v9fs_fcall *tc, *rc;
+
+ tc = kmalloc(sizeof(struct v9fs_fcall), GFP_KERNEL);
dprintk(DEBUG_9P, "fid %d\n", fid);
- msg.id = TCLUNK;
- msg.params.tclunk.fid = fid;
+ tc->id = TCLUNK;
+ tc->params.tclunk.fid = fid;
- return v9fs_mux_rpc(v9ses, &msg, fcall);
+ err = v9fs_mux_rpc(v9ses->mux, tc, &rc);
+ if (err >= 0) {
+ v9fs_t_clunk_cb(v9ses, tc, rc, 0);
+ }
+
+ return err;
}
/**
@@ -121,7 +151,7 @@ int v9fs_t_flush(struct v9fs_session_inf
dprintk(DEBUG_9P, "oldtag %d\n", tag);
msg.id = TFLUSH;
msg.params.tflush.oldtag = tag;
- return v9fs_mux_rpc(v9ses, &msg, NULL);
+ return v9fs_mux_rpc(v9ses->mux, &msg, NULL);
}
/**
@@ -143,7 +173,7 @@ v9fs_t_stat(struct v9fs_session_info *v9
msg.id = TSTAT;
msg.params.tstat.fid = fid;
- return v9fs_mux_rpc(v9ses, &msg, fcall);
+ return v9fs_mux_rpc(v9ses->mux, &msg, fcall);
}
/**
@@ -166,7 +196,7 @@ v9fs_t_wstat(struct v9fs_session_info *v
msg.params.twstat.fid = fid;
msg.params.twstat.stat = stat;
- return v9fs_mux_rpc(v9ses, &msg, fcall);
+ return v9fs_mux_rpc(v9ses->mux, &msg, fcall);
}
/**
@@ -199,7 +229,7 @@ v9fs_t_walk(struct v9fs_session_info *v9
msg.params.twalk.nwname = 0;
}
- return v9fs_mux_rpc(v9ses, &msg, fcall);
+ return v9fs_mux_rpc(v9ses->mux, &msg, fcall);
}
/**
@@ -217,14 +247,14 @@ v9fs_t_open(struct v9fs_session_info *v9
struct v9fs_fcall **fcall)
{
struct v9fs_fcall msg;
- long errorno = -1;
+ int errorno = -1;
dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);
msg.id = TOPEN;
msg.params.topen.fid = fid;
msg.params.topen.mode = mode;
- errorno = v9fs_mux_rpc(v9ses, &msg, fcall);
+ errorno = v9fs_mux_rpc(v9ses->mux, &msg, fcall);
return errorno;
}
@@ -246,7 +276,7 @@ v9fs_t_remove(struct v9fs_session_info *
dprintk(DEBUG_9P, "fid %d\n", fid);
msg.id = TREMOVE;
msg.params.tremove.fid = fid;
- return v9fs_mux_rpc(v9ses, &msg, fcall);
+ return v9fs_mux_rpc(v9ses->mux, &msg, fcall);
}
/**
@@ -275,7 +305,7 @@ v9fs_t_create(struct v9fs_session_info *
msg.params.tcreate.perm = perm;
msg.params.tcreate.mode = mode;
- return v9fs_mux_rpc(v9ses, &msg, fcall);
+ return v9fs_mux_rpc(v9ses->mux, &msg, fcall);
}
/**
@@ -302,7 +332,7 @@ v9fs_t_read(struct v9fs_session_info *v9
msg.params.tread.fid = fid;
msg.params.tread.offset = offset;
msg.params.tread.count = count;
- errorno = v9fs_mux_rpc(v9ses, &msg, &rc);
+ errorno = v9fs_mux_rpc(v9ses->mux, &msg, &rc);
if (!errorno) {
errorno = rc->params.rread.count;
@@ -345,7 +375,7 @@ v9fs_t_write(struct v9fs_session_info *v
msg.params.twrite.count = count;
msg.params.twrite.data = data;
- errorno = v9fs_mux_rpc(v9ses, &msg, &rc);
+ errorno = v9fs_mux_rpc(v9ses->mux, &msg, &rc);
if (!errorno)
errorno = rc->params.rwrite.count;
diff --git a/fs/9p/9p.h b/fs/9p/9p.h
index f554242..6355392 100644
--- a/fs/9p/9p.h
+++ b/fs/9p/9p.h
@@ -100,6 +100,9 @@ enum {
V9FS_QTFILE = 0x00,
};
+#define V9FS_NOTAG (u16)(~0)
+#define V9FS_NOFID (u32)(~0)
+
/* ample room for Twrite/Rread header (iounit) */
#define V9FS_IOHDRSZ 24
@@ -303,6 +306,9 @@ struct v9fs_fcall {
} params;
};
+#define V9FS_FCALLHDRSZ (sizeof(struct v9fs_fcall) + \
+ sizeof(struct v9fs_stat) + 16*sizeof(struct v9fs_qid) + 16)
+
#define FCALL_ERROR(fcall) (fcall ? fcall->params.rerror.error : "")
int v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize,
@@ -311,8 +317,7 @@ int v9fs_t_version(struct v9fs_session_i
int v9fs_t_attach(struct v9fs_session_info *v9ses, char *uname, char *aname,
u32 fid, u32 afid, struct v9fs_fcall **rcall);
-int v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid,
- struct v9fs_fcall **rcall);
+int v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid);
int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 oldtag);
diff --git a/fs/9p/conv.c b/fs/9p/conv.c
index 18121af..1b9b15d 100644
--- a/fs/9p/conv.c
+++ b/fs/9p/conv.c
@@ -208,7 +208,7 @@ static inline char *buf_get_stringb(stru
len = buf_get_int16(buf);
if (!buf_check_overflow(buf) && buf_check_size(buf, len) &&
- buf_check_size(sbuf, len+1)) {
+ buf_check_size(sbuf, len + 1)) {
memcpy(sbuf->p, buf->p, len);
sbuf->p[len] = 0;
@@ -252,13 +252,12 @@ static inline void *buf_get_datab(struct
/**
* v9fs_size_stat - calculate the size of a variable length stat struct
- * @v9ses: session information
* @stat: metadata (stat) structure
+ * @extended: non-zero if 9P2000.u
*
*/
-static int v9fs_size_stat(struct v9fs_session_info *v9ses,
- struct v9fs_stat *stat)
+static int v9fs_size_stat(struct v9fs_stat *stat, int extended)
{
int size = 0;
@@ -288,7 +287,7 @@ static int v9fs_size_stat(struct v9fs_se
if (stat->muid)
size += strlen(stat->muid);
- if (v9ses->extended) {
+ if (extended) {
size += 4 + /* n_uid[4] */
4 + /* n_gid[4] */
4 + /* n_muid[4] */
@@ -302,15 +301,14 @@ static int v9fs_size_stat(struct v9fs_se
/**
* serialize_stat - safely format a stat structure for transmission
- * @v9ses: session info
* @stat: metadata (stat) structure
* @bufp: buffer to serialize structure into
+ * @extended: non-zero if 9P2000.u
*
*/
static int
-serialize_stat(struct v9fs_session_info *v9ses, struct v9fs_stat *stat,
- struct cbuf *bufp)
+serialize_stat(struct v9fs_stat *stat, struct cbuf *bufp, int extended)
{
buf_put_int16(bufp, stat->size);
buf_put_int16(bufp, stat->type);
@@ -328,7 +326,7 @@ serialize_stat(struct v9fs_session_info
buf_put_string(bufp, stat->gid);
buf_put_string(bufp, stat->muid);
- if (v9ses->extended) {
+ if (extended) {
buf_put_string(bufp, stat->extension);
buf_put_int32(bufp, stat->n_uid);
buf_put_int32(bufp, stat->n_gid);
@@ -343,16 +341,16 @@ serialize_stat(struct v9fs_session_info
/**
* deserialize_stat - safely decode a recieved metadata (stat) structure
- * @v9ses: session info
* @bufp: buffer to deserialize
* @stat: metadata (stat) structure
* @dbufp: buffer to deserialize variable strings into
+ * @extended: non-zero if 9P2000.u
*
*/
static inline int
-deserialize_stat(struct v9fs_session_info *v9ses, struct cbuf *bufp,
- struct v9fs_stat *stat, struct cbuf *dbufp)
+deserialize_stat(struct cbuf *bufp, struct v9fs_stat *stat,
+ struct cbuf *dbufp, int extended)
{
stat->size = buf_get_int16(bufp);
@@ -370,7 +368,7 @@ deserialize_stat(struct v9fs_session_inf
stat->gid = buf_get_stringb(bufp, dbufp);
stat->muid = buf_get_stringb(bufp, dbufp);
- if (v9ses->extended) {
+ if (extended) {
stat->extension = buf_get_stringb(bufp, dbufp);
stat->n_uid = buf_get_int32(bufp);
stat->n_gid = buf_get_int32(bufp);
@@ -385,20 +383,20 @@ deserialize_stat(struct v9fs_session_inf
/**
* deserialize_statb - wrapper for decoding a received metadata structure
- * @v9ses: session info
* @bufp: buffer to deserialize
* @dbufp: buffer to deserialize variable strings into
+ * @extended: non-zero if 9P2000.u
*
*/
-static inline struct v9fs_stat *deserialize_statb(struct v9fs_session_info
- *v9ses, struct cbuf *bufp,
- struct cbuf *dbufp)
+static inline struct v9fs_stat *deserialize_statb(struct cbuf *bufp,
+ struct cbuf *dbufp,
+ int extended)
{
struct v9fs_stat *ret = buf_alloc(dbufp, sizeof(struct v9fs_stat));
if (ret) {
- int n = deserialize_stat(v9ses, bufp, ret, dbufp);
+ int n = deserialize_stat(bufp, ret, dbufp, extended);
if (n <= 0)
return NULL;
}
@@ -408,17 +406,16 @@ static inline struct v9fs_stat *deserial
/**
* v9fs_deserialize_stat - decode a received metadata structure
- * @v9ses: session info
* @buf: buffer to deserialize
* @buflen: length of received buffer
* @stat: metadata structure to decode into
* @statlen: length of destination metadata structure
+ * @extended: non-zero if 9P2000.u
*
*/
-int
-v9fs_deserialize_stat(struct v9fs_session_info *v9ses, void *buf,
- u32 buflen, struct v9fs_stat *stat, u32 statlen)
+int v9fs_deserialize_stat(void *buf, u32 buflen, struct v9fs_stat *stat,
+ u32 statlen, int extended)
{
struct cbuf buffer;
struct cbuf *bufp = &buffer;
@@ -429,11 +426,10 @@ v9fs_deserialize_stat(struct v9fs_sessio
buf_init(dbufp, (char *)stat + sizeof(struct v9fs_stat),
statlen - sizeof(struct v9fs_stat));
- return deserialize_stat(v9ses, bufp, stat, dbufp);
+ return deserialize_stat(bufp, stat, dbufp, extended);
}
-static inline int
-v9fs_size_fcall(struct v9fs_session_info *v9ses, struct v9fs_fcall *fcall)
+static inline int v9fs_size_fcall(struct v9fs_fcall *fcall, int extended)
{
int size = 4 + 1 + 2; /* size[4] msg[1] tag[2] */
int i = 0;
@@ -485,7 +481,7 @@ v9fs_size_fcall(struct v9fs_session_info
break;
case TWSTAT: /* fid[4] stat[n] */
fcall->params.twstat.stat->size =
- v9fs_size_stat(v9ses, fcall->params.twstat.stat);
+ v9fs_size_stat(fcall->params.twstat.stat, extended);
size += 4 + 2 + 2 + fcall->params.twstat.stat->size;
}
return size;
@@ -493,16 +489,16 @@ v9fs_size_fcall(struct v9fs_session_info
/*
* v9fs_serialize_fcall - marshall fcall struct into a packet
- * @v9ses: session information
* @fcall: structure to convert
* @data: buffer to serialize fcall into
* @datalen: length of buffer to serialize fcall into
+ * @extended: non-zero if 9P2000.u
*
*/
int
-v9fs_serialize_fcall(struct v9fs_session_info *v9ses, struct v9fs_fcall *fcall,
- void *data, u32 datalen)
+v9fs_serialize_fcall(struct v9fs_fcall *fcall, void *data, u32 datalen,
+ int extended)
{
int i = 0;
struct v9fs_stat *stat = NULL;
@@ -516,7 +512,7 @@ v9fs_serialize_fcall(struct v9fs_session
return -EINVAL;
}
- fcall->size = v9fs_size_fcall(v9ses, fcall);
+ fcall->size = v9fs_size_fcall(fcall, extended);
buf_put_int32(bufp, fcall->size);
buf_put_int8(bufp, fcall->id);
@@ -591,31 +587,31 @@ v9fs_serialize_fcall(struct v9fs_session
stat = fcall->params.twstat.stat;
buf_put_int16(bufp, stat->size + 2);
- serialize_stat(v9ses, stat, bufp);
+ serialize_stat(stat, bufp, extended);
break;
}
- if (buf_check_overflow(bufp))
+ if (buf_check_overflow(bufp)) {
+ dprintk(DEBUG_ERROR, "buffer overflow\n");
return -EIO;
+ }
return fcall->size;
}
/**
* deserialize_fcall - unmarshal a response
- * @v9ses: session information
- * @msgsize: size of rcall message
* @buf: recieved buffer
* @buflen: length of received buffer
* @rcall: fcall structure to populate
* @rcalllen: length of fcall structure to populate
+ * @extended: non-zero if 9P2000.u
*
*/
int
-v9fs_deserialize_fcall(struct v9fs_session_info *v9ses, u32 msgsize,
- void *buf, u32 buflen, struct v9fs_fcall *rcall,
- int rcalllen)
+v9fs_deserialize_fcall(void *buf, u32 buflen, struct v9fs_fcall *rcall,
+ int rcalllen, int extended)
{
struct cbuf buffer;
@@ -628,7 +624,7 @@ v9fs_deserialize_fcall(struct v9fs_sessi
buf_init(dbufp, (char *)rcall + sizeof(struct v9fs_fcall),
rcalllen - sizeof(struct v9fs_fcall));
- rcall->size = msgsize;
+ rcall->size = buf_get_int32(bufp);
rcall->id = buf_get_int8(bufp);
rcall->tag = buf_get_int16(bufp);
@@ -651,6 +647,12 @@ v9fs_deserialize_fcall(struct v9fs_sessi
break;
case RWALK:
rcall->params.rwalk.nwqid = buf_get_int16(bufp);
+ if (rcall->params.rwalk.nwqid > 16) {
+ eprintk(KERN_ERR, "Rwalk with more than 16 qids: %d\n",
+ rcall->params.rwalk.nwqid);
+ return -EPROTO;
+ }
+
rcall->params.rwalk.wqids = buf_alloc(dbufp,
rcall->params.rwalk.nwqid * sizeof(struct v9fs_qid));
if (rcall->params.rwalk.wqids)
@@ -690,19 +692,21 @@ v9fs_deserialize_fcall(struct v9fs_sessi
case RSTAT:
buf_get_int16(bufp);
rcall->params.rstat.stat =
- deserialize_statb(v9ses, bufp, dbufp);
+ deserialize_statb(bufp, dbufp, extended);
break;
case RWSTAT:
break;
case RERROR:
rcall->params.rerror.error = buf_get_stringb(bufp, dbufp);
- if (v9ses->extended)
+ if (extended)
rcall->params.rerror.errno = buf_get_int16(bufp);
break;
}
- if (buf_check_overflow(bufp) || buf_check_overflow(dbufp))
+ if (buf_check_overflow(bufp) || buf_check_overflow(dbufp)) {
+ dprintk(DEBUG_ERROR, "buffer overflow\n");
return -EIO;
+ }
return rcall->size;
}
diff --git a/fs/9p/conv.h b/fs/9p/conv.h
index ee84961..ad928b7 100644
--- a/fs/9p/conv.h
+++ b/fs/9p/conv.h
@@ -24,13 +24,12 @@
*
*/
-int v9fs_deserialize_stat(struct v9fs_session_info *, void *buf,
- u32 buflen, struct v9fs_stat *stat, u32 statlen);
-int v9fs_serialize_fcall(struct v9fs_session_info *, struct v9fs_fcall *tcall,
- void *buf, u32 buflen);
-int v9fs_deserialize_fcall(struct v9fs_session_info *, u32 msglen,
- void *buf, u32 buflen, struct v9fs_fcall *rcall,
- int rcalllen);
+int v9fs_deserialize_stat(void *buf, u32 buflen, struct v9fs_stat *stat,
+ u32 statlen, int extended);
+int v9fs_serialize_fcall(struct v9fs_fcall *tcall, void *buf, u32 buflen,
+ int extended);
+int v9fs_deserialize_fcall(void *buf, u32 buflen, struct v9fs_fcall *rcall,
+ int rcalllen, int extended);
/* this one is actually in error.c right now */
int v9fs_errstr2errno(char *errstr);
diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index d95f862..60ef8ab 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -164,7 +164,7 @@ static struct v9fs_fid *v9fs_fid_walk_up
return v9fs_fid_create(dentry, v9ses, fidnum, 0);
clunk_fid:
- v9fs_t_clunk(v9ses, fidnum, NULL);
+ v9fs_t_clunk(v9ses, fidnum);
return ERR_PTR(err);
}
diff --git a/fs/9p/mux.c b/fs/9p/mux.c
index 8835b57..884fa75 100644
--- a/fs/9p/mux.c
+++ b/fs/9p/mux.c
@@ -4,7 +4,7 @@
* Protocol Multiplexer
*
* Copyright (C) 2004 by Eric Van Hensbergen <[email protected]>
- * Copyright (C) 2004 by Latchesar Ionkov <[email protected]>
+ * Copyright (C) 2004-2005 by Latchesar Ionkov <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -28,6 +28,7 @@
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
+#include <linux/poll.h>
#include <linux/kthread.h>
#include <linux/idr.h>
@@ -38,438 +39,905 @@
#include "conv.h"
#include "mux.h"
-/**
- * dprintcond - print condition of session info
- * @v9ses: session info structure
- * @req: RPC request structure
- *
- */
+#define NELEM(x) (sizeof(x) / sizeof((x)[0]))
-static inline int
-dprintcond(struct v9fs_session_info *v9ses, struct v9fs_rpcreq *req)
+#define ERREQFLUSH 1
+#define SCHED_TIMEOUT 10
+#define MAXPOLLWADDR 2
+
+enum {
+ Rworksched = 1, /* read work scheduled or running */
+ Rpending = 2, /* can read */
+ Wworksched = 4, /* write work scheduled or running */
+ Wpending = 8, /* can write */
+};
+
+struct v9fs_mux_poll_task;
+
+struct v9fs_req {
+ int tag;
+ struct v9fs_fcall *tcall;
+ struct v9fs_fcall *rcall;
+ int err;
+ v9fs_mux_req_callback cb;
+ void *cba;
+ struct list_head req_list;
+};
+
+struct v9fs_mux_data {
+ spinlock_t lock;
+ struct list_head mux_list;
+ struct v9fs_mux_poll_task *poll_task;
+ int msize;
+ unsigned char *extended;
+ struct v9fs_transport *trans;
+ struct v9fs_idpool tidpool;
+ int err;
+ wait_queue_head_t equeue;
+ struct list_head req_list;
+ struct list_head unsent_req_list;
+ int rpos;
+ char *rbuf;
+ int wpos;
+ int wsize;
+ char *wbuf;
+ wait_queue_t poll_wait[MAXPOLLWADDR];
+ wait_queue_head_t *poll_waddr[MAXPOLLWADDR];
+ poll_table pt;
+ struct work_struct rq;
+ struct work_struct wq;
+ unsigned long wsched;
+};
+
+struct v9fs_mux_poll_task {
+ struct task_struct *task;
+ struct list_head mux_list;
+ int muxnum;
+};
+
+struct v9fs_mux_rpc {
+ struct v9fs_mux_data *m;
+ struct v9fs_req *req;
+ int err;
+ struct v9fs_fcall *rcall;
+ wait_queue_head_t wqueue;
+};
+
+static int v9fs_poll_proc(void *);
+static void v9fs_read_work(void *);
+static void v9fs_write_work(void *);
+static void v9fs_pollwait(struct file *filp, wait_queue_head_t * wait_address,
+ poll_table * p);
+
+static DECLARE_MUTEX(v9fs_mux_task_lock);
+static struct workqueue_struct *v9fs_mux_wq;
+
+static int v9fs_mux_num;
+static int v9fs_mux_poll_task_num;
+static struct v9fs_mux_poll_task v9fs_mux_poll_tasks[100];
+
+void v9fs_mux_global_init(void)
{
- dprintk(DEBUG_MUX, "condition: %d, %p\n", v9ses->transport->status,
- req->rcall);
- return 0;
+ int i;
+
+ for (i = 0; i < NELEM(v9fs_mux_poll_tasks); i++)
+ v9fs_mux_poll_tasks[i].task = NULL;
+
+ v9fs_mux_wq = create_workqueue("v9fs");
+}
+
+void v9fs_mux_global_exit(void)
+{
+ destroy_workqueue(v9fs_mux_wq);
}
/**
- * xread - force read of a certain number of bytes
- * @v9ses: session info structure
- * @ptr: pointer to buffer
- * @sz: number of bytes to read
+ * v9fs_mux_calc_poll_procs - calculates the number of polling procs
+ * based on the number of mounted v9fs filesystems.
*
- * Chuck Cranor CS-533 project1
+ * The current implementation returns sqrt of the number of mounts.
*/
+inline int v9fs_mux_calc_poll_procs(int muxnum)
+{
+ int n;
+
+ if (v9fs_mux_poll_task_num)
+ n = muxnum / v9fs_mux_poll_task_num +
+ (muxnum % v9fs_mux_poll_task_num ? 1 : 0);
+ else
+ n = 1;
+
+ if (n > NELEM(v9fs_mux_poll_tasks))
+ n = NELEM(v9fs_mux_poll_tasks);
+
+ return n;
+}
+
+static void v9fs_mux_poll_start(struct v9fs_mux_data *m)
+{
+ int i, n;
+ struct v9fs_mux_poll_task *vpt, *vptlast;
+
+ dprintk(DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, v9fs_mux_num,
+ v9fs_mux_poll_task_num);
+ up(&v9fs_mux_task_lock);
+
+ n = v9fs_mux_calc_poll_procs(v9fs_mux_num + 1);
+ if (n > v9fs_mux_poll_task_num) {
+ for (i = 0; i < NELEM(v9fs_mux_poll_tasks); i++) {
+ if (v9fs_mux_poll_tasks[i].task == NULL) {
+ vpt = &v9fs_mux_poll_tasks[i];
+ dprintk(DEBUG_MUX, "create proc %p\n", vpt);
+ vpt->task = kthread_create(v9fs_poll_proc,
+ vpt, "v9fs-poll");
+ INIT_LIST_HEAD(&vpt->mux_list);
+ vpt->muxnum = 0;
+ v9fs_mux_poll_task_num++;
+ wake_up_process(vpt->task);
+ break;
+ }
+ }
-static int xread(struct v9fs_session_info *v9ses, void *ptr, unsigned long sz)
+ if (i >= NELEM(v9fs_mux_poll_tasks))
+ dprintk(DEBUG_ERROR, "warning: no free poll slots\n");
+ }
+
+ n = (v9fs_mux_num + 1) / v9fs_mux_poll_task_num +
+ ((v9fs_mux_num + 1) % v9fs_mux_poll_task_num ? 1 : 0);
+
+ vptlast = NULL;
+ for (i = 0; i < NELEM(v9fs_mux_poll_tasks); i++) {
+ vpt = &v9fs_mux_poll_tasks[i];
+ if (vpt->task != NULL) {
+ vptlast = vpt;
+ if (vpt->muxnum < n) {
+ dprintk(DEBUG_MUX, "put in proc %d\n", i);
+ list_add(&m->mux_list, &vpt->mux_list);
+ vpt->muxnum++;
+ m->poll_task = vpt;
+ memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
+ init_poll_funcptr(&m->pt, v9fs_pollwait);
+ break;
+ }
+ }
+ }
+
+ if (i >= NELEM(v9fs_mux_poll_tasks)) {
+ dprintk(DEBUG_MUX, "put in proc %d\n", i);
+ list_add(&m->mux_list, &vptlast->mux_list);
+ vptlast->muxnum++;
+ m->poll_task = vpt;
+ memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
+ init_poll_funcptr(&m->pt, v9fs_pollwait);
+ }
+
+ v9fs_mux_num++;
+ down(&v9fs_mux_task_lock);
+}
+
+static void v9fs_mux_poll_stop(struct v9fs_mux_data *m)
{
- int rd = 0;
- int ret = 0;
- while (rd < sz) {
- ret = v9ses->transport->read(v9ses->transport, ptr, sz - rd);
- if (ret <= 0) {
- dprintk(DEBUG_ERROR, "xread errno %d\n", ret);
- return ret;
+ int i;
+ struct v9fs_mux_poll_task *vpt;
+
+ up(&v9fs_mux_task_lock);
+ vpt = m->poll_task;
+ list_del(&m->mux_list);
+ for(i = 0; i < NELEM(m->poll_waddr); i++) {
+ if (m->poll_waddr[i] != NULL) {
+ remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]);
+ m->poll_waddr[i] = NULL;
}
- rd += ret;
- ptr += ret;
}
- return (rd);
+ vpt->muxnum--;
+ if (!vpt->muxnum) {
+ dprintk(DEBUG_MUX, "destroy proc %p\n", vpt);
+ send_sig(SIGKILL, vpt->task, 1);
+ vpt->task = NULL;
+ v9fs_mux_poll_task_num--;
+ }
+ v9fs_mux_num--;
+ down(&v9fs_mux_task_lock);
}
/**
- * read_message - read a full 9P2000 fcall packet
- * @v9ses: session info structure
- * @rcall: fcall structure to read into
- * @rcalllen: size of fcall buffer
+ * v9fs_mux_init - allocate and initialize the per-session mux data
+ * Creates the polling task if this is the first session.
*
+ * @trans - transport structure
+ * @msize - maximum message size
+ * @extended - pointer to the extended flag
*/
-
-static int
-read_message(struct v9fs_session_info *v9ses,
- struct v9fs_fcall *rcall, int rcalllen)
+struct v9fs_mux_data *v9fs_mux_init(struct v9fs_transport *trans, int msize,
+ unsigned char *extended)
{
- unsigned char buf[4];
- void *data;
- int size = 0;
- int res = 0;
+ int i, n;
+ struct v9fs_mux_data *m, *mtmp;
- res = xread(v9ses, buf, sizeof(buf));
- if (res < 0) {
- dprintk(DEBUG_ERROR,
- "Reading of count field failed returned: %d\n", res);
- return res;
+ dprintk(DEBUG_MUX, "transport %p msize %d\n", trans, msize);
+ m = kmalloc(sizeof(struct v9fs_mux_data) + 2 * msize, GFP_KERNEL);
+ if (!m)
+ return ERR_PTR(-ENOMEM);
+
+ spin_lock_init(&m->lock);
+ INIT_LIST_HEAD(&m->mux_list);
+ m->msize = msize;
+ m->extended = extended;
+ m->trans = trans;
+ idr_init(&m->tidpool.pool);
+ init_MUTEX(&m->tidpool.lock);
+ m->err = 0;
+ init_waitqueue_head(&m->equeue);
+ INIT_LIST_HEAD(&m->req_list);
+ INIT_LIST_HEAD(&m->unsent_req_list);
+ m->rpos = 0;
+ m->rbuf = (char *)m + sizeof(struct v9fs_mux_data);
+ m->wpos = m->wsize = 0;
+ m->wbuf = m->rbuf + msize;
+ INIT_WORK(&m->rq, v9fs_read_work, m);
+ INIT_WORK(&m->wq, v9fs_write_work, m);
+ m->wsched = 0;
+ memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
+ v9fs_mux_poll_start(m);
+
+ n = trans->poll(trans, &m->pt);
+ if (n & POLLIN) {
+ dprintk(DEBUG_MUX, "mux %p can read\n", m);
+ set_bit(Rpending, &m->wsched);
+ }
+
+ if (n & POLLOUT) {
+ dprintk(DEBUG_MUX, "mux %p can write\n", m);
+ set_bit(Wpending, &m->wsched);
+ }
+
+ for(i = 0; i < NELEM(m->poll_waddr); i++) {
+ if (IS_ERR(m->poll_waddr[i])) {
+ v9fs_mux_poll_stop(m);
+ mtmp = (void *)m->poll_waddr; /* the error code */
+ kfree(m);
+ m = mtmp;
+ break;
+ }
}
- if (res < 4) {
- dprintk(DEBUG_ERROR,
- "Reading of count field failed returned: %d\n", res);
- return -EIO;
+ return m;
+}
+
+/**
+ * v9fs_mux_destroy - cancels all pending requests and frees mux resources
+ */
+void v9fs_mux_destroy(struct v9fs_mux_data *m)
+{
+ dprintk(DEBUG_MUX, "mux %p prev %p next %p\n", m,
+ m->mux_list.prev, m->mux_list.next);
+ v9fs_mux_cancel(m, -ECONNRESET);
+
+ if (!list_empty(&m->req_list)) {
+ /* wait until all processes waiting on this session exit */
+ dprintk(DEBUG_MUX, "mux %p waiting for empty request queue\n",
+ m);
+ wait_event_timeout(m->equeue, (list_empty(&m->req_list)), 5000);
+ dprintk(DEBUG_MUX, "mux %p request queue empty: %d\n", m,
+ list_empty(&m->req_list));
}
- size = buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
- dprintk(DEBUG_MUX, "got a packet count: %d\n", size);
+ v9fs_mux_poll_stop(m);
+ m->trans = NULL;
- /* adjust for the four bytes of size */
- size -= 4;
+ kfree(m);
+}
- if (size > v9ses->maxdata) {
- dprintk(DEBUG_ERROR, "packet too big: %d\n", size);
- return -E2BIG;
- }
+/**
+ * v9fs_pollwait - called by files poll operation to add v9fs-poll task
+ * to files wait queue
+ */
+static void
+v9fs_pollwait(struct file *filp, wait_queue_head_t * wait_address,
+ poll_table * p)
+{
+ int i;
+ struct v9fs_mux_data *m;
- data = kmalloc(size, GFP_KERNEL);
- if (!data) {
- eprintk(KERN_WARNING, "out of memory\n");
- return -ENOMEM;
+ m = container_of(p, struct v9fs_mux_data, pt);
+ for(i = 0; i < NELEM(m->poll_waddr); i++)
+ if (m->poll_waddr[i] == NULL)
+ break;
+
+ if (i >= NELEM(m->poll_waddr)) {
+ dprintk(DEBUG_ERROR, "not enough wait_address slots\n");
+ return;
}
- res = xread(v9ses, data, size);
- if (res < size) {
- dprintk(DEBUG_ERROR, "Reading of fcall failed returned: %d\n",
- res);
- kfree(data);
- return res;
+ m->poll_waddr[i] = wait_address;
+
+ if (!wait_address) {
+ dprintk(DEBUG_ERROR, "no wait_address\n");
+ m->poll_waddr[i] = ERR_PTR(-EIO);
+ return;
}
- /* we now have an in-memory string that is the reply.
- * deserialize it. There is very little to go wrong at this point
- * save for v9fs_alloc errors.
- */
- res = v9fs_deserialize_fcall(v9ses, size, data, v9ses->maxdata,
- rcall, rcalllen);
+ init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task);
+ add_wait_queue(wait_address, &m->poll_wait[i]);
+}
- kfree(data);
+/**
+ * v9fs_poll_mux - polls a mux and schedules read or write works if necessary
+ */
+static inline void v9fs_poll_mux(struct v9fs_mux_data *m)
+{
+ int n;
- if (res < 0)
- return res;
+ if (m->err < 0)
+ return;
- return 0;
+ n = m->trans->poll(m->trans, NULL);
+ if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
+ dprintk(DEBUG_MUX, "error mux %p err %d\n", m, n);
+ if (n >= 0)
+ n = -ECONNRESET;
+ v9fs_mux_cancel(m, n);
+ }
+
+ if (n & POLLIN) {
+ set_bit(Rpending, &m->wsched);
+ dprintk(DEBUG_MUX, "mux %p can read\n", m);
+ if (!test_and_set_bit(Rworksched, &m->wsched)) {
+ dprintk(DEBUG_MUX, "schedule read work mux %p\n", m);
+ queue_work(v9fs_mux_wq, &m->rq);
+ }
+ }
+
+ if (n & POLLOUT) {
+ set_bit(Wpending, &m->wsched);
+ dprintk(DEBUG_MUX, "mux %p can write\n", m);
+ if ((m->wsize || !list_empty(&m->unsent_req_list))
+ && !test_and_set_bit(Wworksched, &m->wsched)) {
+ dprintk(DEBUG_MUX, "schedule write work mux %p\n", m);
+ queue_work(v9fs_mux_wq, &m->wq);
+ }
+ }
}
/**
- * v9fs_recv - receive an RPC response for a particular tag
- * @v9ses: session info structure
- * @req: RPC request structure
- *
+ * v9fs_poll_proc - polls all v9fs transports for new events and queues
+ * the appropriate work to the work queue
*/
-
-static int v9fs_recv(struct v9fs_session_info *v9ses, struct v9fs_rpcreq *req)
+static int v9fs_poll_proc(void *a)
{
- int ret = 0;
+ struct v9fs_mux_data *m, *mtmp;
+ struct v9fs_mux_poll_task *vpt;
+
+ vpt = a;
+ dprintk(DEBUG_MUX, "start %p %p\n", current, vpt);
+ allow_signal(SIGKILL);
+ while (!kthread_should_stop()) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (signal_pending(current))
+ break;
- dprintk(DEBUG_MUX, "waiting for response: %d\n", req->tcall->tag);
- ret = wait_event_interruptible(v9ses->read_wait,
- ((v9ses->transport->status != Connected) ||
- (req->rcall != 0) || (req->err < 0) ||
- dprintcond(v9ses, req)));
+ list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) {
+ v9fs_poll_mux(m);
+ }
- dprintk(DEBUG_MUX, "got it: rcall %p\n", req->rcall);
+ dprintk(DEBUG_MUX, "sleeping...\n");
+ schedule_timeout(SCHED_TIMEOUT * HZ);
+ }
- spin_lock(&v9ses->muxlock);
- list_del(&req->next);
- spin_unlock(&v9ses->muxlock);
+ __set_current_state(TASK_RUNNING);
+ dprintk(DEBUG_MUX, "finish\n");
+ return 0;
+}
- if (req->err < 0)
- return req->err;
+static inline int v9fs_write_req(struct v9fs_mux_data *m, struct v9fs_req *req)
+{
+ int n;
- if (v9ses->transport->status == Disconnected)
- return -ECONNRESET;
+ list_move_tail(&req->req_list, &m->req_list);
+ n = v9fs_serialize_fcall(req->tcall, m->wbuf, m->msize, *m->extended);
+ if (n < 0) {
+ req->err = n;
+ list_del(&req->req_list);
+ if (req->cb) {
+ spin_unlock(&m->lock);
+ (*req->cb) (req->cba, req->tcall, req->rcall, req->err);
+ req->cb = NULL;
+ spin_lock(&m->lock);
+ } else
+ kfree(req->rcall);
- return ret;
+ kfree(req);
+ }
+
+ return n;
}
/**
- * v9fs_send - send a 9P request
- * @v9ses: session info structure
- * @req: RPC request to send
- *
+ * v9fs_write_work - called when a transport can send some data
*/
-
-static int v9fs_send(struct v9fs_session_info *v9ses, struct v9fs_rpcreq *req)
+static void v9fs_write_work(void *a)
{
- int ret = -1;
- void *data = NULL;
- struct v9fs_fcall *tcall = req->tcall;
-
- data = kmalloc(v9ses->maxdata + V9FS_IOHDRSZ, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- tcall->size = 0; /* enforce size recalculation */
- ret =
- v9fs_serialize_fcall(v9ses, tcall, data,
- v9ses->maxdata + V9FS_IOHDRSZ);
- if (ret < 0)
- goto free_data;
-
- spin_lock(&v9ses->muxlock);
- list_add(&req->next, &v9ses->mux_fcalls);
- spin_unlock(&v9ses->muxlock);
-
- dprintk(DEBUG_MUX, "sending message: tag %d size %d\n", tcall->tag,
- tcall->size);
- ret = v9ses->transport->write(v9ses->transport, data, tcall->size);
-
- if (ret != tcall->size) {
- spin_lock(&v9ses->muxlock);
- list_del(&req->next);
- kfree(req->rcall);
+ int n, err;
+ struct v9fs_mux_data *m;
+ struct v9fs_req *req, *rtmp;
+
+ m = a;
+
+ if (m->err < 0) {
+ clear_bit(Wworksched, &m->wsched);
+ return;
+ }
- spin_unlock(&v9ses->muxlock);
- if (ret >= 0)
- ret = -EREMOTEIO;
+ if (!m->wsize) {
+ if (list_empty(&m->unsent_req_list)) {
+ clear_bit(Wworksched, &m->wsched);
+ return;
+ }
+
+ err = 0;
+ spin_lock(&m->lock);
+ list_for_each_entry_safe(req, rtmp, &m->unsent_req_list,
+ req_list) {
+ err = v9fs_write_req(m, req);
+ if (err > 0)
+ break;
+ }
+
+ m->wsize = err;
+ m->wpos = 0;
+ spin_unlock(&m->lock);
+ }
+
+ dprintk(DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, m->wsize);
+ clear_bit(Wpending, &m->wsched);
+ err = m->trans->write(m->trans, m->wbuf + m->wpos, m->wsize - m->wpos);
+ dprintk(DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
+ if (err == -EAGAIN) {
+ clear_bit(Wworksched, &m->wsched);
+ return;
+ }
+
+ if (err <= 0)
+ goto error;
+
+ m->wpos += err;
+ if (m->wpos == m->wsize)
+ m->wpos = m->wsize = 0;
+
+ if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
+ if (test_and_clear_bit(Wpending, &m->wsched))
+ n = POLLOUT;
+ else
+ n = m->trans->poll(m->trans, NULL);
+
+ if (n & POLLOUT) {
+ dprintk(DEBUG_MUX, "schedule write work mux %p\n", m);
+ queue_work(v9fs_mux_wq, &m->wq);
+ } else
+ clear_bit(Wworksched, &m->wsched);
} else
- ret = 0;
+ clear_bit(Wworksched, &m->wsched);
+
+ return;
- free_data:
- kfree(data);
- return ret;
+ error:
+ v9fs_mux_cancel(m, err);
+ clear_bit(Wworksched, &m->wsched);
}
-/**
- * v9fs_mux_rpc - send a request, receive a response
- * @v9ses: session info structure
- * @tcall: fcall to send
- * @rcall: buffer to place response into
- *
- */
+static void process_request(struct v9fs_mux_data *m, struct v9fs_req *req)
+{
+ int ecode, tag;
+ char *ename;
+
+ tag = req->tag;
+ if (req->rcall->id == RERROR && !req->err) {
+ ecode = req->rcall->params.rerror.errno;
+ ename = req->rcall->params.rerror.error;
+
+ dprintk(DEBUG_MUX, "Rerror %s\n", ename);
-long
-v9fs_mux_rpc(struct v9fs_session_info *v9ses, struct v9fs_fcall *tcall,
- struct v9fs_fcall **rcall)
-{
- int tid = -1;
- struct v9fs_fcall *fcall = NULL;
- struct v9fs_rpcreq req;
- int ret = -1;
-
- if (!v9ses)
- return -EINVAL;
-
- if (!v9ses->transport || v9ses->transport->status != Connected)
- return -EIO;
-
- if (rcall)
- *rcall = NULL;
-
- if (tcall->id != TVERSION) {
- tid = v9fs_get_idpool(&v9ses->tidpool);
- if (tid < 0)
- return -ENOMEM;
- }
-
- tcall->tag = tid;
-
- req.tcall = tcall;
- req.err = 0;
- req.rcall = NULL;
-
- ret = v9fs_send(v9ses, &req);
-
- if (ret < 0) {
- if (tcall->id != TVERSION)
- v9fs_put_idpool(tid, &v9ses->tidpool);
- dprintk(DEBUG_MUX, "error %d\n", ret);
- return ret;
- }
-
- ret = v9fs_recv(v9ses, &req);
-
- fcall = req.rcall;
-
- dprintk(DEBUG_MUX, "received: tag=%x, ret=%d\n", tcall->tag, ret);
- if (ret == -ERESTARTSYS) {
- if (v9ses->transport->status != Disconnected
- && tcall->id != TFLUSH) {
- unsigned long flags;
-
- dprintk(DEBUG_MUX, "flushing the tag: %d\n",
- tcall->tag);
- clear_thread_flag(TIF_SIGPENDING);
- v9fs_t_flush(v9ses, tcall->tag);
- spin_lock_irqsave(¤t->sighand->siglock, flags);
- recalc_sigpending();
- spin_unlock_irqrestore(¤t->sighand->siglock,
- flags);
- dprintk(DEBUG_MUX, "flushing done\n");
- }
-
- goto release_req;
- } else if (ret < 0)
- goto release_req;
-
- if (!fcall)
- ret = -EIO;
- else {
- if (fcall->id == RERROR) {
- ret = v9fs_errstr2errno(fcall->params.rerror.error);
- if (ret == 0) { /* string match failed */
- if (fcall->params.rerror.errno)
- ret = -(fcall->params.rerror.errno);
- else
- ret = -ESERVERFAULT;
+ if (*m->extended)
+ req->err = -ecode;
+
+ if (!req->err) {
+ req->err = v9fs_errstr2errno(ename);
+
+ if (!req->err) { /* string match failed */
+ dprintk(DEBUG_ERROR, "unknown error: %s\n",
+ ename);
}
- } else if (fcall->id != tcall->id + 1) {
- dprintk(DEBUG_ERROR,
- "fcall mismatch: expected %d, got %d\n",
- tcall->id + 1, fcall->id);
- ret = -EIO;
+
+ if (!req->err)
+ req->err = -ESERVERFAULT;
}
+ } else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
+ dprintk(DEBUG_ERROR, "fcall mismatch: expected %d, got %d\n",
+ req->tcall->id + 1, req->rcall->id);
+ if (!req->err)
+ req->err = -EIO;
}
- release_req:
- if (tcall->id != TVERSION)
- v9fs_put_idpool(tid, &v9ses->tidpool);
- if (rcall)
- *rcall = fcall;
- else
- kfree(fcall);
+ if (req->cb && req->err != ERREQFLUSH) {
+ dprintk(DEBUG_MUX, "calling callback tcall %p rcall %p\n",
+ req->tcall, req->rcall);
- return ret;
-}
+ (*req->cb) (req->cba, req->tcall, req->rcall, req->err);
+ req->cb = NULL;
+ } else
+ kfree(req->rcall);
-/**
- * v9fs_mux_cancel_requests - cancels all pending requests
- *
- * @v9ses: session info structure
- * @err: error code to return to the requests
- */
-void v9fs_mux_cancel_requests(struct v9fs_session_info *v9ses, int err)
-{
- struct v9fs_rpcreq *rptr;
- struct v9fs_rpcreq *rreq;
+ if (tag != V9FS_NOTAG)
+ v9fs_put_idpool(tag, &m->tidpool);
- dprintk(DEBUG_MUX, " %d\n", err);
- spin_lock(&v9ses->muxlock);
- list_for_each_entry_safe(rreq, rptr, &v9ses->mux_fcalls, next) {
- rreq->err = err;
- }
- spin_unlock(&v9ses->muxlock);
- wake_up_all(&v9ses->read_wait);
+ wake_up(&m->equeue);
+ kfree(req);
}
/**
- * v9fs_recvproc - kproc to handle demultiplexing responses
- * @data: session info structure
- *
+ * v9fs_read_work - called when there is some data to be read from a transport
*/
-
-static int v9fs_recvproc(void *data)
+static void v9fs_read_work(void *a)
{
- struct v9fs_session_info *v9ses = (struct v9fs_session_info *)data;
- struct v9fs_fcall *rcall = NULL;
- struct v9fs_rpcreq *rptr;
- struct v9fs_rpcreq *req;
- struct v9fs_rpcreq *rreq;
- int err = 0;
+ int n, err, rcallen;
+ struct v9fs_mux_data *m;
+ struct v9fs_req *req, *rptr, *rreq;
+ struct v9fs_fcall *rcall;
+
+ m = a;
+
+ if (m->err < 0)
+ return;
+
+ rcall = NULL;
+ dprintk(DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
+ clear_bit(Rpending, &m->wsched);
+ err = m->trans->read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos);
+ dprintk(DEBUG_MUX, "mux %p got %d bytes\n", m, err);
+ if (err == -EAGAIN) {
+ clear_bit(Rworksched, &m->wsched);
+ return;
+ }
+
+ if (err <= 0)
+ goto error;
+
+ m->rpos += err;
+ while (m->rpos > 4) {
+ n = le32_to_cpu(*(__le32 *) m->rbuf);
+ if (n >= m->msize) {
+ dprintk(DEBUG_ERROR,
+ "requested packet size too big: %d\n", n);
+ err = -EIO;
+ goto error;
+ }
- allow_signal(SIGKILL);
- set_current_state(TASK_INTERRUPTIBLE);
- complete(&v9ses->proccmpl);
- while (!kthread_should_stop() && err >= 0) {
- req = rptr = rreq = NULL;
+ if (m->rpos < n)
+ break;
- rcall = kmalloc(v9ses->maxdata + V9FS_IOHDRSZ, GFP_KERNEL);
+ rcallen = n + V9FS_FCALLHDRSZ;
+ rcall = kmalloc(rcallen, GFP_KERNEL);
if (!rcall) {
- eprintk(KERN_ERR, "no memory for buffers\n");
- break;
+ err = -ENOMEM;
+ goto error;
}
- err = read_message(v9ses, rcall, v9ses->maxdata + V9FS_IOHDRSZ);
- spin_lock(&v9ses->muxlock);
+ dump_data(m->rbuf, n);
+ err = v9fs_deserialize_fcall(m->rbuf, n, rcall, rcallen,
+ *m->extended);
if (err < 0) {
- list_for_each_entry_safe(rreq, rptr, &v9ses->mux_fcalls, next) {
- rreq->err = err;
- }
- if(err != -ERESTARTSYS)
- eprintk(KERN_ERR,
- "Transport error while reading message %d\n", err);
- } else {
- list_for_each_entry_safe(rreq, rptr, &v9ses->mux_fcalls, next) {
- if (rreq->tcall->tag == rcall->tag) {
- req = rreq;
- req->rcall = rcall;
- break;
- }
- }
+ kfree(rcall);
+ goto error;
}
- if (req && (req->tcall->id == TFLUSH)) {
- struct v9fs_rpcreq *treq = NULL;
- list_for_each_entry_safe(treq, rptr, &v9ses->mux_fcalls, next) {
- if (treq->tcall->tag ==
- req->tcall->params.tflush.oldtag) {
- list_del(&rptr->next);
- kfree(treq->rcall);
- break;
- }
+ dprintk(DEBUG_MUX, "mux %p fcall id %d tag %d\n", m, rcall->id,
+ rcall->tag);
+
+ req = NULL;
+ spin_lock(&m->lock);
+ list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
+ if (rreq->tag == rcall->tag) {
+ req = rreq;
+ req->rcall = rcall;
+ list_del(&req->req_list);
+ spin_unlock(&m->lock);
+ process_request(m, req);
+ break;
}
}
- spin_unlock(&v9ses->muxlock);
-
if (!req) {
- if (err >= 0)
+ spin_unlock(&m->lock);
+ if (err >= 0 && rcall->id != RFLUSH)
dprintk(DEBUG_ERROR,
- "unexpected response: id %d tag %d\n",
- rcall->id, rcall->tag);
-
+ "unexpected response mux %p id %d tag %d\n",
+ m, rcall->id, rcall->tag);
kfree(rcall);
}
- wake_up_all(&v9ses->read_wait);
- set_current_state(TASK_INTERRUPTIBLE);
+ if (m->rpos > n)
+ memmove(m->rbuf, m->rbuf + n, m->rpos - n);
+ m->rpos -= n;
+ }
+
+ if (!list_empty(&m->req_list)) {
+ if (test_and_clear_bit(Rpending, &m->wsched))
+ n = POLLIN;
+ else
+ n = m->trans->poll(m->trans, NULL);
+
+ if (n & POLLIN) {
+ dprintk(DEBUG_MUX, "schedule read work mux %p\n", m);
+ queue_work(v9fs_mux_wq, &m->rq);
+ } else
+ clear_bit(Rworksched, &m->wsched);
+ } else
+ clear_bit(Rworksched, &m->wsched);
+
+ return;
+
+ error:
+ v9fs_mux_cancel(m, err);
+ clear_bit(Rworksched, &m->wsched);
+}
+
+/**
+ * v9fs_send_request - send 9P request
+ * The function can sleep until the request is scheduled for sending.
+ * The function can be interrupted. Return from the function is not
+ * a guarantee that the request is sent succesfully. Can return errors
+ * that can be retrieved by PTR_ERR macros.
+ *
+ * @m: mux data
+ * @tc: request to be sent
+ * @cb: callback function to call when response is received
+ * @cba: parameter to pass to the callback function
+ */
+static struct v9fs_req *v9fs_send_request(struct v9fs_mux_data *m,
+ struct v9fs_fcall *tc,
+ v9fs_mux_req_callback cb, void *cba)
+{
+ int n;
+ struct v9fs_req *req;
+
+ dprintk(DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
+ tc, tc->id);
+ if (m->err < 0)
+ return ERR_PTR(m->err);
+
+ req = kmalloc(sizeof(struct v9fs_req), GFP_KERNEL);
+ if (!req)
+ return ERR_PTR(-ENOMEM);
+
+ if (tc->id == TVERSION)
+ n = V9FS_NOTAG;
+ else
+ n = v9fs_get_idpool(&m->tidpool);
+
+ if (n < 0)
+ return ERR_PTR(-ENOMEM);
+
+ tc->tag = n;
+ req->tag = n;
+ req->tcall = tc;
+ req->rcall = NULL;
+ req->err = 0;
+ req->cb = cb;
+ req->cba = cba;
+
+ spin_lock(&m->lock);
+ list_add_tail(&req->req_list, &m->unsent_req_list);
+ spin_unlock(&m->lock);
+
+ if (test_and_clear_bit(Wpending, &m->wsched))
+ n = POLLOUT;
+ else
+ n = m->trans->poll(m->trans, NULL);
+
+ if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
+ queue_work(v9fs_mux_wq, &m->wq);
+
+ return req;
+}
+
+static inline void
+v9fs_mux_flush_cb(void *a, struct v9fs_fcall *tc, struct v9fs_fcall *rc,
+ int err)
+{
+ v9fs_mux_req_callback cb;
+ int tag;
+ struct v9fs_mux_data *m;
+ struct v9fs_req *req, *rptr;
+
+ m = a;
+ dprintk(DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m, tc,
+ rc, err, tc->params.tflush.oldtag);
+
+ spin_lock(&m->lock);
+ cb = NULL;
+ tag = tc->params.tflush.oldtag;
+ list_for_each_entry_safe(req, rptr, &m->req_list, req_list) {
+ if (req->tag == tag) {
+ list_del(&req->req_list);
+ if (req->cb) {
+ cb = req->cb;
+ req->cb = NULL;
+ spin_unlock(&m->lock);
+ (*cb) (req->cba, req->tcall, req->rcall,
+ req->err);
+ }
+ kfree(req);
+ wake_up(&m->equeue);
+ break;
+ }
}
- v9ses->transport->close(v9ses->transport);
+ if (!cb)
+ spin_unlock(&m->lock);
+
+ if (v9fs_check_idpool(tag, &m->tidpool))
+ v9fs_put_idpool(tag, &m->tidpool);
+
+ kfree(tc);
+ kfree(rc);
+}
- /* Inform all pending processes about the failure */
- wake_up_all(&v9ses->read_wait);
+static void
+v9fs_mux_flush_request(struct v9fs_mux_data *m, struct v9fs_req *req)
+{
+ struct v9fs_fcall *fc;
- if (signal_pending(current))
- complete(&v9ses->proccmpl);
+ dprintk(DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
- dprintk(DEBUG_MUX, "recvproc: end\n");
- v9ses->recvproc = NULL;
+ fc = kmalloc(sizeof(struct v9fs_fcall), GFP_KERNEL);
+ fc->id = TFLUSH;
+ fc->params.tflush.oldtag = req->tag;
- return err >= 0;
+ v9fs_send_request(m, fc, v9fs_mux_flush_cb, m);
+}
+
+static void
+v9fs_mux_rpc_cb(void *a, struct v9fs_fcall *tc, struct v9fs_fcall *rc, int err)
+{
+ struct v9fs_mux_rpc *r;
+
+ if (err == ERREQFLUSH) {
+ dprintk(DEBUG_MUX, "err req flush\n");
+ return;
+ }
+
+ r = a;
+ dprintk(DEBUG_MUX, "mux %p req %p tc %p rc %p err %d\n", r->m, r->req,
+ tc, rc, err);
+ r->rcall = rc;
+ r->err = err;
+ wake_up(&r->wqueue);
}
/**
- * v9fs_mux_init - initialize multiplexer (spawn kproc)
- * @v9ses: session info structure
- * @dev_name: mount device information (to create unique kproc)
- *
+ * v9fs_mux_rpc - sends 9P request and waits until a response is available.
+ * The function can be interrupted.
+ * @m: mux data
+ * @tc: request to be sent
+ * @rc: pointer where a pointer to the response is stored
*/
+int
+v9fs_mux_rpc(struct v9fs_mux_data *m, struct v9fs_fcall *tc,
+ struct v9fs_fcall **rc)
+{
+ int err;
+ unsigned long flags;
+ struct v9fs_req *req;
+ struct v9fs_mux_rpc r;
+
+ r.err = 0;
+ r.rcall = NULL;
+ r.m = m;
+ init_waitqueue_head(&r.wqueue);
+
+ if (rc)
+ *rc = NULL;
+
+ req = v9fs_send_request(m, tc, v9fs_mux_rpc_cb, &r);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ dprintk(DEBUG_MUX, "error %d\n", err);
+ return PTR_ERR(req);
+ }
+
+ r.req = req;
+ dprintk(DEBUG_MUX, "mux %p tc %p tag %d rpc %p req %p\n", m, tc,
+ req->tag, &r, req);
+ err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0);
+ if (r.err < 0)
+ err = r.err;
+
+ if (err == -ERESTARTSYS && m->trans->status == Connected && m->err == 0) {
+ spin_lock(&m->lock);
+ req->tcall = NULL;
+ req->err = ERREQFLUSH;
+ spin_unlock(&m->lock);
+
+ clear_thread_flag(TIF_SIGPENDING);
+ v9fs_mux_flush_request(m, req);
+ spin_lock_irqsave(¤t->sighand->siglock, flags);
+ recalc_sigpending();
+ spin_unlock_irqrestore(¤t->sighand->siglock, flags);
+ }
+
+ if (!err) {
+ if (r.rcall)
+ dprintk(DEBUG_MUX, "got response id %d tag %d\n",
+ r.rcall->id, r.rcall->tag);
+
+ if (rc)
+ *rc = r.rcall;
+ else
+ kfree(r.rcall);
+ } else {
+ kfree(r.rcall);
+ dprintk(DEBUG_MUX, "got error %d\n", err);
+ if (err > 0)
+ err = -EIO;
+ }
+
+ return err;
+}
-int v9fs_mux_init(struct v9fs_session_info *v9ses, const char *dev_name)
+/**
+ * v9fs_mux_rpcnb - sends 9P request without waiting for response.
+ * @m: mux data
+ * @tc: request to be sent
+ * @cb: callback function to be called when response arrives
+ * @cba: value to pass to the callback function
+ */
+int v9fs_mux_rpcnb(struct v9fs_mux_data *m, struct v9fs_fcall *tc,
+ v9fs_mux_req_callback cb, void *a)
{
- char procname[60];
+ int err;
+ struct v9fs_req *req;
- strncpy(procname, dev_name, sizeof(procname));
- procname[sizeof(procname) - 1] = 0;
+ req = v9fs_send_request(m, tc, cb, a);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ dprintk(DEBUG_MUX, "error %d\n", err);
+ return PTR_ERR(req);
+ }
- init_waitqueue_head(&v9ses->read_wait);
- init_completion(&v9ses->fcread);
- init_completion(&v9ses->proccmpl);
- spin_lock_init(&v9ses->muxlock);
- INIT_LIST_HEAD(&v9ses->mux_fcalls);
- v9ses->recvproc = NULL;
- v9ses->curfcall = NULL;
+ dprintk(DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag);
+ return 0;
+}
- v9ses->recvproc = kthread_create(v9fs_recvproc, v9ses,
- "v9fs_recvproc %s", procname);
+/**
+ * v9fs_mux_cancel - cancel all pending requests with error
+ * @m: mux data
+ * @err: error code
+ */
+void v9fs_mux_cancel(struct v9fs_mux_data *m, int err)
+{
+ struct v9fs_req *req, *rtmp;
+ LIST_HEAD(cancel_list);
- if (IS_ERR(v9ses->recvproc)) {
- eprintk(KERN_ERR, "cannot create receiving thread\n");
- v9fs_session_close(v9ses);
- return -ECONNABORTED;
+ dprintk(DEBUG_MUX, "mux %p err %d\n", m, err);
+ m->err = err;
+ spin_lock(&m->lock);
+ list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
+ list_move(&req->req_list, &cancel_list);
}
+ spin_unlock(&m->lock);
- wake_up_process(v9ses->recvproc);
- wait_for_completion(&v9ses->proccmpl);
+ list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
+ list_del(&req->req_list);
+ if (!req->err)
+ req->err = err;
- return 0;
+ if (req->cb)
+ (*req->cb) (req->cba, req->tcall, req->rcall, req->err);
+ else
+ kfree(req->rcall);
+
+ kfree(req);
+ }
+
+ wake_up(&m->equeue);
}
diff --git a/fs/9p/mux.h b/fs/9p/mux.h
index 4994cb1..a7a1e19 100644
--- a/fs/9p/mux.h
+++ b/fs/9p/mux.h
@@ -3,6 +3,7 @@
*
* Multiplexer Definitions
*
+ * Copyright (C) 2005 by Latchesar Ionkov <[email protected]>
* Copyright (C) 2004 by Eric Van Hensbergen <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
@@ -23,19 +24,34 @@
*
*/
-/* structure to manage each RPC transaction */
+struct v9fs_mux_data;
-struct v9fs_rpcreq {
- struct v9fs_fcall *tcall;
- struct v9fs_fcall *rcall;
- int err; /* error code if response failed */
-
- /* XXX - could we put scatter/gather buffers here? */
-
- struct list_head next;
-};
-
-int v9fs_mux_init(struct v9fs_session_info *v9ses, const char *dev_name);
-long v9fs_mux_rpc(struct v9fs_session_info *v9ses,
- struct v9fs_fcall *tcall, struct v9fs_fcall **rcall);
-void v9fs_mux_cancel_requests(struct v9fs_session_info *v9ses, int err);
+/**
+ * v9fs_mux_req_callback - callback function that is called when the
+ * response of a request is received. The callback is called from
+ * a workqueue and shouldn't block.
+ *
+ * @a - the pointer that was specified when the request was send to be
+ * passed to the callback
+ * @tc - request call
+ * @rc - response call
+ * @err - error code (non-zero if error occured)
+ */
+typedef void (*v9fs_mux_req_callback)(void *a, struct v9fs_fcall *tc,
+ struct v9fs_fcall *rc, int err);
+
+void v9fs_mux_global_init(void);
+void v9fs_mux_global_exit(void);
+
+struct v9fs_mux_data *v9fs_mux_init(struct v9fs_transport *trans, int msize,
+ unsigned char *extended);
+void v9fs_mux_destroy(struct v9fs_mux_data *);
+
+int v9fs_mux_send(struct v9fs_mux_data *m, struct v9fs_fcall *tc);
+struct v9fs_fcall *v9fs_mux_recv(struct v9fs_mux_data *m);
+int v9fs_mux_rpc(struct v9fs_mux_data *m, struct v9fs_fcall *tc, struct v9fs_fcall **rc);
+int v9fs_mux_rpcnb(struct v9fs_mux_data *m, struct v9fs_fcall *tc,
+ v9fs_mux_req_callback cb, void *a);
+
+void v9fs_mux_flush(struct v9fs_mux_data *m, int sendflush);
+void v9fs_mux_cancel(struct v9fs_mux_data *m, int err);
diff --git a/fs/9p/trans_fd.c b/fs/9p/trans_fd.c
index 63b58ce..4b33f24 100644
--- a/fs/9p/trans_fd.c
+++ b/fs/9p/trans_fd.c
@@ -3,6 +3,7 @@
*
* File Descriptor Transport Layer
*
+ * Copyright (C) 2005 by Latchesar Ionkov <[email protected]>
* Copyright (C) 2005 by Eric Van Hensbergen <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
@@ -106,9 +107,6 @@ v9fs_fd_init(struct v9fs_session_info *v
return -ENOPROTOOPT;
}
- sema_init(&trans->writelock, 1);
- sema_init(&trans->readlock, 1);
-
ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL);
if (!ts)
@@ -163,10 +161,55 @@ static void v9fs_fd_close(struct v9fs_tr
kfree(ts);
}
+static unsigned int
+v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt)
+{
+ int ret, n;
+ struct v9fs_trans_fd *ts;
+ mm_segment_t oldfs;
+
+ if (!trans)
+ return -EIO;
+
+ ts = trans->priv;
+ if (trans->status != Connected || !ts)
+ return -EIO;
+
+ oldfs = get_fs();
+ set_fs(get_ds());
+
+ if (!ts->in_file->f_op || !ts->in_file->f_op->poll) {
+ ret = -EIO;
+ goto end;
+ }
+
+ ret = ts->in_file->f_op->poll(ts->in_file, pt);
+
+ if (ts->out_file != ts->in_file) {
+ if (!ts->out_file->f_op || !ts->out_file->f_op->poll) {
+ ret = -EIO;
+ goto end;
+ }
+
+ n = ts->out_file->f_op->poll(ts->out_file, pt);
+
+ ret &= ~POLLOUT;
+ n &= ~POLLIN;
+
+ ret |= n;
+ }
+
+end:
+ set_fs(oldfs);
+ return ret;
+}
+
+
struct v9fs_transport v9fs_trans_fd = {
.init = v9fs_fd_init,
.write = v9fs_fd_send,
.read = v9fs_fd_recv,
.close = v9fs_fd_close,
+ .poll = v9fs_fd_poll,
};
diff --git a/fs/9p/trans_sock.c b/fs/9p/trans_sock.c
index a93c2bf..24dd078 100644
--- a/fs/9p/trans_sock.c
+++ b/fs/9p/trans_sock.c
@@ -3,6 +3,7 @@
*
* Socket Transport Layer
*
+ * Copyright (C) 2004-2005 by Latchesar Ionkov <[email protected]>
* Copyright (C) 2004 by Eric Van Hensbergen <[email protected]>
* Copyright (C) 1997-2002 by Ron Minnich <[email protected]>
* Copyright (C) 1995, 1996 by Olaf Kirch <[email protected]>
@@ -35,6 +36,7 @@
#include <asm/uaccess.h>
#include <linux/inet.h>
#include <linux/idr.h>
+#include <linux/file.h>
#include "debug.h"
#include "v9fs.h"
@@ -44,6 +46,7 @@
struct v9fs_trans_sock {
struct socket *s;
+ struct file *filp;
};
/**
@@ -56,41 +59,26 @@ struct v9fs_trans_sock {
static int v9fs_sock_recv(struct v9fs_transport *trans, void *v, int len)
{
- struct msghdr msg;
- struct kvec iov;
- int result;
- mm_segment_t oldfs;
- struct v9fs_trans_sock *ts = trans ? trans->priv : NULL;
+ int ret;
+ struct v9fs_trans_sock *ts;
- if (trans->status == Disconnected)
+ if (!trans || trans->status == Disconnected) {
+ dprintk(DEBUG_ERROR, "disconnected ...\n");
return -EREMOTEIO;
+ }
- result = -EINVAL;
-
- oldfs = get_fs();
- set_fs(get_ds());
-
- iov.iov_base = v;
- iov.iov_len = len;
- msg.msg_name = NULL;
- msg.msg_namelen = 0;
- msg.msg_iovlen = 1;
- msg.msg_control = NULL;
- msg.msg_controllen = 0;
- msg.msg_namelen = 0;
- msg.msg_flags = MSG_NOSIGNAL;
-
- result = kernel_recvmsg(ts->s, &msg, &iov, 1, len, 0);
+ ts = trans->priv;
- dprintk(DEBUG_TRANS, "socket state %d\n", ts->s->state);
- set_fs(oldfs);
+ if (!(ts->filp->f_flags & O_NONBLOCK))
+ dprintk(DEBUG_ERROR, "blocking read ...\n");
- if (result <= 0) {
- if (result != -ERESTARTSYS)
+ ret = kernel_read(ts->filp, ts->filp->f_pos, v, len);
+ if (ret <= 0) {
+ if (ret != -ERESTARTSYS && ret != -EAGAIN)
trans->status = Disconnected;
}
- return result;
+ return ret;
}
/**
@@ -103,40 +91,73 @@ static int v9fs_sock_recv(struct v9fs_tr
static int v9fs_sock_send(struct v9fs_transport *trans, void *v, int len)
{
- struct kvec iov;
- struct msghdr msg;
- int result = -1;
+ int ret;
mm_segment_t oldfs;
- struct v9fs_trans_sock *ts = trans ? trans->priv : NULL;
+ struct v9fs_trans_sock *ts;
- dprintk(DEBUG_TRANS, "Sending packet size %d (%x)\n", len, len);
- dump_data(v, len);
+ if (!trans || trans->status == Disconnected) {
+ dprintk(DEBUG_ERROR, "disconnected ...\n");
+ return -EREMOTEIO;
+ }
+
+ ts = trans->priv;
+ if (!ts) {
+ dprintk(DEBUG_ERROR, "no transport ...\n");
+ return -EREMOTEIO;
+ }
- down(&trans->writelock);
+ if (!(ts->filp->f_flags & O_NONBLOCK))
+ dprintk(DEBUG_ERROR, "blocking write ...\n");
+ dump_data(v, len);
oldfs = get_fs();
set_fs(get_ds());
- iov.iov_base = v;
- iov.iov_len = len;
- msg.msg_name = NULL;
- msg.msg_namelen = 0;
- msg.msg_iovlen = 1;
- msg.msg_control = NULL;
- msg.msg_controllen = 0;
- msg.msg_namelen = 0;
- msg.msg_flags = MSG_NOSIGNAL;
- result = kernel_sendmsg(ts->s, &msg, &iov, 1, len);
+ ret = vfs_write(ts->filp, (void __user *)v, len, &ts->filp->f_pos);
set_fs(oldfs);
- if (result < 0) {
- if (result != -ERESTARTSYS)
+ if (ret < 0) {
+ if (ret != -ERESTARTSYS)
trans->status = Disconnected;
}
- up(&trans->writelock);
- return result;
+ return ret;
+}
+
+static unsigned int v9fs_sock_poll(struct v9fs_transport *trans,
+ struct poll_table_struct *pt) {
+
+ int ret;
+ struct v9fs_trans_sock *ts;
+ mm_segment_t oldfs;
+
+ if (!trans) {
+ dprintk(DEBUG_ERROR, "no transport\n");
+ return -EIO;
+ }
+
+ ts = trans->priv;
+ if (trans->status != Connected || !ts) {
+ dprintk(DEBUG_ERROR, "transport disconnected: %d\n", trans->status);
+ return -EIO;
+ }
+
+ oldfs = get_fs();
+ set_fs(get_ds());
+
+ if (!ts->filp->f_op || !ts->filp->f_op->poll) {
+ dprintk(DEBUG_ERROR, "no poll operation\n");
+ ret = -EIO;
+ goto end;
+ }
+
+ ret = ts->filp->f_op->poll(ts->filp, pt);
+
+end:
+ set_fs(oldfs);
+ return ret;
}
+
/**
* v9fs_tcp_init - initialize TCP socket
* @v9ses: session information
@@ -153,9 +174,9 @@ v9fs_tcp_init(struct v9fs_session_info *
int rc = 0;
struct v9fs_trans_sock *ts = NULL;
struct v9fs_transport *trans = v9ses->transport;
+ int fd;
- sema_init(&trans->writelock, 1);
- sema_init(&trans->readlock, 1);
+ trans->status = Disconnected;
ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL);
@@ -164,6 +185,7 @@ v9fs_tcp_init(struct v9fs_session_info *
trans->priv = ts;
ts->s = NULL;
+ ts->filp = NULL;
if (!addr)
return -EINVAL;
@@ -184,7 +206,18 @@ v9fs_tcp_init(struct v9fs_session_info *
return rc;
}
csocket->sk->sk_allocation = GFP_NOIO;
+
+ fd = sock_map_fd(csocket);
+ if (fd < 0) {
+ sock_release(csocket);
+ kfree(ts);
+ trans->priv = NULL;
+ return fd;
+ }
+
ts->s = csocket;
+ ts->filp = fget(fd);
+ ts->filp->f_flags |= O_NONBLOCK;
trans->status = Connected;
return 0;
@@ -202,7 +235,7 @@ static int
v9fs_unix_init(struct v9fs_session_info *v9ses, const char *dev_name,
char *data)
{
- int rc;
+ int rc, fd;
struct socket *csocket;
struct sockaddr_un sun_server;
struct v9fs_transport *trans;
@@ -212,6 +245,8 @@ v9fs_unix_init(struct v9fs_session_info
csocket = NULL;
trans = v9ses->transport;
+ trans->status = Disconnected;
+
if (strlen(dev_name) > UNIX_PATH_MAX) {
eprintk(KERN_ERR, "v9fs_trans_unix: address too long: %s\n",
dev_name);
@@ -224,14 +259,12 @@ v9fs_unix_init(struct v9fs_session_info
trans->priv = ts;
ts->s = NULL;
-
- sema_init(&trans->writelock, 1);
- sema_init(&trans->readlock, 1);
+ ts->filp = NULL;
sun_server.sun_family = PF_UNIX;
strcpy(sun_server.sun_path, dev_name);
sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
- rc = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
+ rc = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
sizeof(struct sockaddr_un) - 1, 0); /* -1 *is* important */
if (rc < 0) {
eprintk(KERN_ERR,
@@ -240,7 +273,18 @@ v9fs_unix_init(struct v9fs_session_info
return rc;
}
csocket->sk->sk_allocation = GFP_NOIO;
+
+ fd = sock_map_fd(csocket);
+ if (fd < 0) {
+ sock_release(csocket);
+ kfree(ts);
+ trans->priv = NULL;
+ return fd;
+ }
+
ts->s = csocket;
+ ts->filp = fget(fd);
+ ts->filp->f_flags |= O_NONBLOCK;
trans->status = Connected;
return 0;
@@ -261,12 +305,11 @@ static void v9fs_sock_close(struct v9fs_
ts = trans->priv;
- if ((ts) && (ts->s)) {
- dprintk(DEBUG_TRANS, "closing the socket %p\n", ts->s);
- sock_release(ts->s);
+ if ((ts) && (ts->filp)) {
+ fput(ts->filp);
+ ts->filp = NULL;
ts->s = NULL;
trans->status = Disconnected;
- dprintk(DEBUG_TRANS, "socket closed\n");
}
kfree(ts);
@@ -279,6 +322,7 @@ struct v9fs_transport v9fs_trans_tcp = {
.write = v9fs_sock_send,
.read = v9fs_sock_recv,
.close = v9fs_sock_close,
+ .poll = v9fs_sock_poll,
};
struct v9fs_transport v9fs_trans_unix = {
@@ -286,4 +330,5 @@ struct v9fs_transport v9fs_trans_unix =
.write = v9fs_sock_send,
.read = v9fs_sock_recv,
.close = v9fs_sock_close,
+ .poll = v9fs_sock_poll,
};
diff --git a/fs/9p/transport.h b/fs/9p/transport.h
index 9e9cd41..91fcdb9 100644
--- a/fs/9p/transport.h
+++ b/fs/9p/transport.h
@@ -3,6 +3,7 @@
*
* Transport Definition
*
+ * Copyright (C) 2005 by Latchesar Ionkov <[email protected]>
* Copyright (C) 2004 by Eric Van Hensbergen <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
@@ -31,14 +32,13 @@ enum v9fs_transport_status {
struct v9fs_transport {
enum v9fs_transport_status status;
- struct semaphore writelock;
- struct semaphore readlock;
void *priv;
int (*init) (struct v9fs_session_info *, const char *, char *);
int (*write) (struct v9fs_transport *, void *, int);
int (*read) (struct v9fs_transport *, void *, int);
void (*close) (struct v9fs_transport *);
+ unsigned int (*poll)(struct v9fs_transport *, struct poll_table_struct *);
};
extern struct v9fs_transport v9fs_trans_tcp;
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 418c374..5e0f793 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -213,7 +213,8 @@ retry:
return -1;
}
- error = idr_get_new(&p->pool, NULL, &i);
+ /* no need to store exactly p, we just need something non-null */
+ error = idr_get_new(&p->pool, p, &i);
up(&p->lock);
if (error == -EAGAIN)
@@ -243,6 +244,16 @@ void v9fs_put_idpool(int id, struct v9fs
}
/**
+ * v9fs_check_idpool - check if the specified id is available
+ * @id - id to check
+ * @p - pool
+ */
+int v9fs_check_idpool(int id, struct v9fs_idpool *p)
+{
+ return idr_find(&p->pool, id) != NULL;
+}
+
+/**
* v9fs_session_init - initialize session
* @v9ses: session information structure
* @dev_name: device being mounted
@@ -281,9 +292,6 @@ v9fs_session_init(struct v9fs_session_in
/* id pools that are session-dependent: FIDs and TIDs */
idr_init(&v9ses->fidpool.pool);
init_MUTEX(&v9ses->fidpool.lock);
- idr_init(&v9ses->tidpool.pool);
- init_MUTEX(&v9ses->tidpool.lock);
-
switch (v9ses->proto) {
case PROTO_TCP:
@@ -320,7 +328,12 @@ v9fs_session_init(struct v9fs_session_in
v9ses->shutdown = 0;
v9ses->session_hung = 0;
- if ((retval = v9fs_mux_init(v9ses, dev_name)) < 0) {
+ v9ses->mux = v9fs_mux_init(v9ses->transport, v9ses->maxdata + V9FS_IOHDRSZ,
+ &v9ses->extended);
+
+ if (IS_ERR(v9ses->mux)) {
+ retval = PTR_ERR(v9ses->mux);
+ v9ses->mux = NULL;
dprintk(DEBUG_ERROR, "problem initializing mux\n");
goto SessCleanUp;
}
@@ -381,7 +394,7 @@ v9fs_session_init(struct v9fs_session_in
}
if (v9ses->afid != ~0) {
- if (v9fs_t_clunk(v9ses, v9ses->afid, NULL))
+ if (v9fs_t_clunk(v9ses, v9ses->afid))
dprintk(DEBUG_ERROR, "clunk failed\n");
}
@@ -403,13 +416,16 @@ v9fs_session_init(struct v9fs_session_in
void v9fs_session_close(struct v9fs_session_info *v9ses)
{
- if (v9ses->recvproc) {
- send_sig(SIGKILL, v9ses->recvproc, 1);
- wait_for_completion(&v9ses->proccmpl);
+ if (v9ses->mux) {
+ v9fs_mux_destroy(v9ses->mux);
+ v9ses->mux = NULL;
}
- if (v9ses->transport)
+ if (v9ses->transport) {
v9ses->transport->close(v9ses->transport);
+ kfree(v9ses->transport);
+ v9ses->transport = NULL;
+ }
__putname(v9ses->name);
__putname(v9ses->remotename);
@@ -420,8 +436,9 @@ void v9fs_session_close(struct v9fs_sess
* and cancel all pending requests.
*/
void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
+ dprintk(DEBUG_ERROR, "cancel session %p\n", v9ses);
v9ses->transport->status = Disconnected;
- v9fs_mux_cancel_requests(v9ses, -EIO);
+ v9fs_mux_cancel(v9ses->mux, -EIO);
}
extern int v9fs_error_init(void);
@@ -437,6 +454,7 @@ static int __init init_v9fs(void)
printk(KERN_INFO "Installing v9fs 9P2000 file system support\n");
+ v9fs_mux_global_init();
return register_filesystem(&v9fs_fs_type);
}
@@ -447,6 +465,7 @@ static int __init init_v9fs(void)
static void __exit exit_v9fs(void)
{
+ v9fs_mux_global_exit();
unregister_filesystem(&v9fs_fs_type);
}
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index 45dcef4..f337da7 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -57,24 +57,14 @@ struct v9fs_session_info {
/* book keeping */
struct v9fs_idpool fidpool; /* The FID pool for file descriptors */
- struct v9fs_idpool tidpool; /* The TID pool for transactions ids */
- /* transport information */
struct v9fs_transport *transport;
+ struct v9fs_mux_data *mux;
int inprogress; /* session in progress => true */
int shutdown; /* session shutting down. no more attaches. */
unsigned char session_hung;
-
- /* mux private data */
- struct v9fs_fcall *curfcall;
- wait_queue_head_t read_wait;
- struct completion fcread;
- struct completion proccmpl;
- struct task_struct *recvproc;
-
- spinlock_t muxlock;
- struct list_head mux_fcalls;
+ struct dentry *debugfs_dir;
};
/* possible values of ->proto */
@@ -84,11 +74,14 @@ enum {
PROTO_FD,
};
+extern struct dentry *v9fs_debugfs_root;
+
int v9fs_session_init(struct v9fs_session_info *, const char *, char *);
struct v9fs_session_info *v9fs_inode2v9ses(struct inode *);
void v9fs_session_close(struct v9fs_session_info *v9ses);
int v9fs_get_idpool(struct v9fs_idpool *p);
void v9fs_put_idpool(int id, struct v9fs_idpool *p);
+int v9fs_check_idpool(int id, struct v9fs_idpool *p);
void v9fs_session_cancel(struct v9fs_session_info *v9ses);
#define V9FS_MAGIC 0x01021997
diff --git a/fs/9p/vfs_dentry.c b/fs/9p/vfs_dentry.c
index a6aa947..4887df7 100644
--- a/fs/9p/vfs_dentry.c
+++ b/fs/9p/vfs_dentry.c
@@ -95,24 +95,21 @@ static int v9fs_dentry_validate(struct d
void v9fs_dentry_release(struct dentry *dentry)
{
+ int err;
+
dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
if (dentry->d_fsdata != NULL) {
struct list_head *fid_list = dentry->d_fsdata;
struct v9fs_fid *temp = NULL;
struct v9fs_fid *current_fid = NULL;
- struct v9fs_fcall *fcall = NULL;
list_for_each_entry_safe(current_fid, temp, fid_list, list) {
- if (v9fs_t_clunk
- (current_fid->v9ses, current_fid->fid, &fcall))
- dprintk(DEBUG_ERROR, "clunk failed: %s\n",
- FCALL_ERROR(fcall));
+ err = v9fs_t_clunk(current_fid->v9ses, current_fid->fid);
- v9fs_put_idpool(current_fid->fid,
- ¤t_fid->v9ses->fidpool);
+ if (err < 0)
+ dprintk(DEBUG_ERROR, "clunk failed: %d\n", err);
- kfree(fcall);
v9fs_fid_destroy(current_fid);
}
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index 57a43b8..e9c05ff 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -74,7 +74,7 @@ static int v9fs_dir_readdir(struct file
struct inode *inode = filp->f_dentry->d_inode;
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
struct v9fs_fid *file = filp->private_data;
- unsigned int i, n;
+ unsigned int i, n, s;
int fid = -1;
int ret = 0;
struct v9fs_stat *mi = NULL;
@@ -97,9 +97,9 @@ static int v9fs_dir_readdir(struct file
n = file->rdir_fcall->params.rread.count;
i = file->rdir_fpos;
while (i < n) {
- int s = v9fs_deserialize_stat(v9ses,
- file->rdir_fcall->params.rread.data + i,
- n - i, mi, v9ses->maxdata);
+ s = v9fs_deserialize_stat(
+ file->rdir_fcall->params.rread.data + i,
+ n - i, mi, v9ses->maxdata, v9ses->extended);
if (s == 0) {
dprintk(DEBUG_ERROR,
@@ -141,9 +141,8 @@ static int v9fs_dir_readdir(struct file
n = ret;
i = 0;
while (i < n) {
- int s = v9fs_deserialize_stat(v9ses,
- fcall->params.rread.data + i, n - i, mi,
- v9ses->maxdata);
+ s = v9fs_deserialize_stat(fcall->params.rread.data + i,
+ n - i, mi, v9ses->maxdata, v9ses->extended);
if (s == 0) {
dprintk(DEBUG_ERROR,
@@ -200,11 +199,9 @@ int v9fs_dir_release(struct inode *inode
dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen,
fid->fid);
- if (v9fs_t_clunk(v9ses, fidnum, NULL))
+ if (v9fs_t_clunk(v9ses, fidnum))
dprintk(DEBUG_ERROR, "clunk failed\n");
- v9fs_put_idpool(fid->fid, &v9ses->fidpool);
-
kfree(fid->rdir_fcall);
kfree(fid);
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 0ea965c..466002a 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -318,6 +318,7 @@ v9fs_create(struct inode *dir,
int result = 0;
unsigned int iounit = 0;
int wfidno = -1;
+ int err;
perm = unixmode2p9mode(v9ses, perm);
@@ -356,6 +357,7 @@ v9fs_create(struct inode *dir,
}
kfree(fcall);
+ fcall = NULL;
result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name,
perm, open_mode, &fcall);
@@ -369,16 +371,23 @@ v9fs_create(struct inode *dir,
iounit = fcall->params.rcreate.iounit;
qid = fcall->params.rcreate.qid;
kfree(fcall);
+ fcall = NULL;
- fid = v9fs_fid_create(file_dentry, v9ses, newfid, 1);
- dprintk(DEBUG_VFS, "fid %p %d\n", fid, fid->fidcreate);
- if (!fid) {
- result = -ENOMEM;
- goto CleanUpFid;
- }
+ if (!(perm&V9FS_DMDIR)) {
+ fid = v9fs_fid_create(file_dentry, v9ses, newfid, 1);
+ dprintk(DEBUG_VFS, "fid %p %d\n", fid, fid->fidcreate);
+ if (!fid) {
+ result = -ENOMEM;
+ goto CleanUpFid;
+ }
- fid->qid = qid;
- fid->iounit = iounit;
+ fid->qid = qid;
+ fid->iounit = iounit;
+ } else {
+ err = v9fs_t_clunk(v9ses, newfid);
+ if (err < 0)
+ dprintk(DEBUG_ERROR, "clunk for mkdir failed: %d\n", err);
+ }
/* walk to the newly created file and put the fid in the dentry */
wfidno = v9fs_get_idpool(&v9ses->fidpool);
@@ -388,18 +397,19 @@ v9fs_create(struct inode *dir,
}
result = v9fs_t_walk(v9ses, dirfidnum, wfidno,
- (char *) file_dentry->d_name.name, NULL);
+ (char *) file_dentry->d_name.name, &fcall);
if (result < 0) {
dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall));
v9fs_put_idpool(wfidno, &v9ses->fidpool);
wfidno = -1;
goto CleanUpFid;
}
+ kfree(fcall);
+ fcall = NULL;
if (!v9fs_fid_create(file_dentry, v9ses, wfidno, 0)) {
- if (!v9fs_t_clunk(v9ses, newfid, &fcall)) {
- v9fs_put_idpool(wfidno, &v9ses->fidpool);
- }
+ v9fs_t_clunk(v9ses, newfid);
+ v9fs_put_idpool(wfidno, &v9ses->fidpool);
goto CleanUpFid;
}
@@ -431,40 +441,21 @@ v9fs_create(struct inode *dir,
file_dentry->d_op = &v9fs_dentry_operations;
d_instantiate(file_dentry, file_inode);
- if (perm & V9FS_DMDIR) {
- if (!v9fs_t_clunk(v9ses, newfid, &fcall))
- v9fs_put_idpool(newfid, &v9ses->fidpool);
- else
- dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n",
- FCALL_ERROR(fcall));
- kfree(fcall);
- fid->fidopen = 0;
- fid->fidcreate = 0;
- d_drop(file_dentry);
- }
-
return 0;
CleanUpFid:
kfree(fcall);
+ fcall = NULL;
if (newfid >= 0) {
- if (!v9fs_t_clunk(v9ses, newfid, &fcall))
- v9fs_put_idpool(newfid, &v9ses->fidpool);
- else
- dprintk(DEBUG_ERROR, "clunk failed: %s\n",
- FCALL_ERROR(fcall));
-
- kfree(fcall);
+ err = v9fs_t_clunk(v9ses, newfid);
+ if (err < 0)
+ dprintk(DEBUG_ERROR, "clunk failed: %d\n", err);
}
if (wfidno >= 0) {
- if (!v9fs_t_clunk(v9ses, wfidno, &fcall))
- v9fs_put_idpool(wfidno, &v9ses->fidpool);
- else
- dprintk(DEBUG_ERROR, "clunk failed: %s\n",
- FCALL_ERROR(fcall));
-
- kfree(fcall);
+ err = v9fs_t_clunk(v9ses, wfidno);
+ if (err < 0)
+ dprintk(DEBUG_ERROR, "clunk failed: %d\n", err);
}
return result;
}
@@ -972,6 +963,7 @@ v9fs_vfs_symlink(struct inode *dir, stru
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
struct v9fs_fcall *fcall = NULL;
struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+ int err;
dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
symname);
@@ -1004,9 +996,9 @@ v9fs_vfs_symlink(struct inode *dir, stru
kfree(fcall);
- if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
- dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
- FCALL_ERROR(fcall));
+ err = v9fs_t_clunk(v9ses, newfid->fid);
+ if (err < 0) {
+ dprintk(DEBUG_ERROR, "clunk for symlink failed: %d\n", err);
goto FreeFcall;
}
@@ -1180,6 +1172,7 @@ v9fs_vfs_link(struct dentry *old_dentry,
struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
struct v9fs_fid *newfid = NULL;
char *symname = __getname();
+ int err;
dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
old_dentry->d_name.name);
@@ -1216,9 +1209,10 @@ v9fs_vfs_link(struct dentry *old_dentry,
kfree(fcall);
- if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
- dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
- FCALL_ERROR(fcall));
+ err = v9fs_t_clunk(v9ses, newfid->fid);
+
+ if (err < 0) {
+ dprintk(DEBUG_ERROR, "clunk for symlink failed: %d\n", err);
goto FreeMem;
}
@@ -1252,6 +1246,7 @@ v9fs_vfs_mknod(struct inode *dir, struct
struct v9fs_fcall *fcall = NULL;
struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
char *symname = __getname();
+ int err;
dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
@@ -1310,9 +1305,9 @@ v9fs_vfs_mknod(struct inode *dir, struct
/* need to update dcache so we show up */
kfree(fcall);
- if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
- dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
- FCALL_ERROR(fcall));
+ err = v9fs_t_clunk(v9ses, newfid->fid);
+ if (err < 0) {
+ dprintk(DEBUG_ERROR, "clunk for symlink failed: %d\n", err);
goto FreeMem;
}
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 82c5b00..83b6edd 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -129,6 +129,7 @@ static struct super_block *v9fs_get_sb(s
if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
dprintk(DEBUG_ERROR, "problem initiating session\n");
+ kfree(v9ses);
return ERR_PTR(newfid);
}
@@ -157,7 +158,7 @@ static struct super_block *v9fs_get_sb(s
stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
if (stat_result < 0) {
dprintk(DEBUG_ERROR, "stat error\n");
- v9fs_t_clunk(v9ses, newfid, NULL);
+ v9fs_t_clunk(v9ses, newfid);
v9fs_put_idpool(newfid, &v9ses->fidpool);
} else {
/* Setup the Root Inode */
--
1.0.6
-
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