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-rw-r--r--fs/9p/v9fs.c149
1 files changed, 72 insertions, 77 deletions
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 0a7068e30ecb..08d880fb5b6a 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -37,18 +37,58 @@
#include "v9fs_vfs.h"
/*
+ * Dynamic Transport Registration Routines
+ *
+ */
+
+static LIST_HEAD(v9fs_trans_list);
+static struct p9_trans_module *v9fs_default_trans;
+
+/**
+ * v9fs_register_trans - register a new transport with 9p
+ * @m - structure describing the transport module and entry points
+ *
+ */
+void v9fs_register_trans(struct p9_trans_module *m)
+{
+ list_add_tail(&m->list, &v9fs_trans_list);
+ if (m->def)
+ v9fs_default_trans = m;
+}
+EXPORT_SYMBOL(v9fs_register_trans);
+
+/**
+ * v9fs_match_trans - match transport versus registered transports
+ * @arg: string identifying transport
+ *
+ */
+static struct p9_trans_module *v9fs_match_trans(const substring_t *name)
+{
+ struct list_head *p;
+ struct p9_trans_module *t = NULL;
+
+ list_for_each(p, &v9fs_trans_list) {
+ t = list_entry(p, struct p9_trans_module, list);
+ if (strncmp(t->name, name->from, name->to-name->from) == 0) {
+ P9_DPRINTK(P9_DEBUG_TRANS, "trans=%s\n", t->name);
+ break;
+ }
+ }
+ return t;
+}
+
+/*
* Option Parsing (code inspired by NFS code)
- *
+ * NOTE: each transport will parse its own options
*/
enum {
/* Options that take integer arguments */
- Opt_debug, Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid,
- Opt_rfdno, Opt_wfdno,
+ Opt_debug, Opt_msize, Opt_uid, Opt_gid, Opt_afid,
/* String options */
- Opt_uname, Opt_remotename,
+ Opt_uname, Opt_remotename, Opt_trans,
/* Options that take no arguments */
- Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd, Opt_pci,
+ Opt_legacy, Opt_nodevmap,
/* Cache options */
Opt_cache_loose,
/* Error token */
@@ -57,24 +97,13 @@ enum {
static match_table_t tokens = {
{Opt_debug, "debug=%x"},
- {Opt_port, "port=%u"},
{Opt_msize, "msize=%u"},
{Opt_uid, "uid=%u"},
{Opt_gid, "gid=%u"},
{Opt_afid, "afid=%u"},
- {Opt_rfdno, "rfdno=%u"},
- {Opt_wfdno, "wfdno=%u"},
{Opt_uname, "uname=%s"},
{Opt_remotename, "aname=%s"},
- {Opt_unix, "proto=unix"},
- {Opt_tcp, "proto=tcp"},
- {Opt_fd, "proto=fd"},
-#ifdef CONFIG_PCI_9P
- {Opt_pci, "proto=pci"},
-#endif
- {Opt_tcp, "tcp"},
- {Opt_unix, "unix"},
- {Opt_fd, "fd"},
+ {Opt_trans, "trans=%s"},
{Opt_legacy, "noextend"},
{Opt_nodevmap, "nodevmap"},
{Opt_cache_loose, "cache=loose"},
@@ -82,12 +111,6 @@ static match_table_t tokens = {
{Opt_err, NULL}
};
-extern struct p9_transport *p9pci_trans_create(void);
-
-/*
- * Parse option string.
- */
-
/**
* v9fs_parse_options - parse mount options into session structure
* @options: options string passed from mount
@@ -95,23 +118,21 @@ extern struct p9_transport *p9pci_trans_create(void);
*
*/
-static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
+static void v9fs_parse_options(struct v9fs_session_info *v9ses)
{
- char *p;
+ char *options = v9ses->options;
substring_t args[MAX_OPT_ARGS];
+ char *p;
int option;
int ret;
/* setup defaults */
- v9ses->port = V9FS_PORT;
- v9ses->maxdata = 9000;
- v9ses->proto = PROTO_TCP;
+ v9ses->maxdata = 8192;
v9ses->extended = 1;
v9ses->afid = ~0;
v9ses->debug = 0;
- v9ses->rfdno = ~0;
- v9ses->wfdno = ~0;
v9ses->cache = 0;
+ v9ses->trans = v9fs_default_trans;
if (!options)
return;
@@ -135,9 +156,6 @@ static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
p9_debug_level = option;
#endif
break;
- case Opt_port:
- v9ses->port = option;
- break;
case Opt_msize:
v9ses->maxdata = option;
break;
@@ -150,23 +168,8 @@ static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
case Opt_afid:
v9ses->afid = option;
break;
- case Opt_rfdno:
- v9ses->rfdno = option;
- break;
- case Opt_wfdno:
- v9ses->wfdno = option;
- break;
- case Opt_tcp:
- v9ses->proto = PROTO_TCP;
- break;
- case Opt_unix:
- v9ses->proto = PROTO_UNIX;
- break;
- case Opt_pci:
- v9ses->proto = PROTO_PCI;
- break;
- case Opt_fd:
- v9ses->proto = PROTO_FD;
+ case Opt_trans:
+ v9ses->trans = v9fs_match_trans(&args[0]);
break;
case Opt_uname:
match_strcpy(v9ses->name, &args[0]);
@@ -201,7 +204,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
const char *dev_name, char *data)
{
int retval = -EINVAL;
- struct p9_transport *trans;
+ struct p9_trans *trans = NULL;
struct p9_fid *fid;
v9ses->name = __getname();
@@ -217,39 +220,30 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
strcpy(v9ses->name, V9FS_DEFUSER);
strcpy(v9ses->remotename, V9FS_DEFANAME);
- v9fs_parse_options(data, v9ses);
-
- switch (v9ses->proto) {
- case PROTO_TCP:
- trans = p9_trans_create_tcp(dev_name, v9ses->port);
- break;
- case PROTO_UNIX:
- trans = p9_trans_create_unix(dev_name);
- *v9ses->remotename = 0;
- break;
- case PROTO_FD:
- trans = p9_trans_create_fd(v9ses->rfdno, v9ses->wfdno);
- *v9ses->remotename = 0;
- break;
-#ifdef CONFIG_PCI_9P
- case PROTO_PCI:
- trans = p9pci_trans_create();
- *v9ses->remotename = 0;
- break;
-#endif
- default:
- printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
- retval = -ENOPROTOOPT;
+ v9ses->options = kstrdup(data, GFP_KERNEL);
+ v9fs_parse_options(v9ses);
+
+ if ((v9ses->trans == NULL) && !list_empty(&v9fs_trans_list))
+ v9ses->trans = list_first_entry(&v9fs_trans_list,
+ struct p9_trans_module, list);
+
+ if (v9ses->trans == NULL) {
+ retval = -EPROTONOSUPPORT;
+ P9_DPRINTK(P9_DEBUG_ERROR,
+ "No transport defined or default transport\n");
goto error;
- };
+ }
+ trans = v9ses->trans->create(dev_name, v9ses->options);
if (IS_ERR(trans)) {
retval = PTR_ERR(trans);
trans = NULL;
goto error;
}
+ if ((v9ses->maxdata+P9_IOHDRSZ) > v9ses->trans->maxsize)
+ v9ses->maxdata = v9ses->trans->maxsize-P9_IOHDRSZ;
- v9ses->clnt = p9_client_create(trans, v9ses->maxdata + P9_IOHDRSZ,
+ v9ses->clnt = p9_client_create(trans, v9ses->maxdata+P9_IOHDRSZ,
v9ses->extended);
if (IS_ERR(v9ses->clnt)) {
@@ -290,6 +284,7 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
__putname(v9ses->name);
__putname(v9ses->remotename);
+ kfree(v9ses->options);
}
/**
@@ -311,7 +306,7 @@ extern int v9fs_error_init(void);
static int __init init_v9fs(void)
{
printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
-
+ /* TODO: Setup list of registered trasnport modules */
return register_filesystem(&v9fs_fs_type);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-18 08:51:53 +0000