*
* This file contains functions assisting in mapping VFS to 9P2000
*
- * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
*
* This program is free software; you can redistribute it and/or modify
#include <linux/parser.h>
#include <linux/idr.h>
#include <net/9p/9p.h>
-#include <net/9p/transport.h>
-#include <net/9p/conn.h>
#include <net/9p/client.h>
+#include <net/9p/transport.h>
#include "v9fs.h"
#include "v9fs_vfs.h"
+#include "cache.h"
+
+static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
+static LIST_HEAD(v9fs_sessionlist);
/*
- * Option Parsing (code inspired by NFS code)
- *
- */
+ * 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_dfltuid, Opt_dfltgid, Opt_afid,
/* String options */
- Opt_uname, Opt_remotename,
+ Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag,
/* Options that take no arguments */
- Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd, Opt_pci,
+ Opt_nodevmap,
/* Cache options */
- Opt_cache_loose,
+ Opt_cache_loose, Opt_fscache,
+ /* Access options */
+ Opt_access,
/* Error token */
Opt_err
};
-static match_table_t tokens = {
+static const 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_dfltuid, "dfltuid=%u"},
+ {Opt_dfltgid, "dfltgid=%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_legacy, "noextend"},
{Opt_nodevmap, "nodevmap"},
- {Opt_cache_loose, "cache=loose"},
+ {Opt_cache, "cache=%s"},
{Opt_cache_loose, "loose"},
+ {Opt_fscache, "fscache"},
+ {Opt_cachetag, "cachetag=%s"},
+ {Opt_access, "access=%s"},
{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
* @v9ses: existing v9fs session information
*
+ * Return 0 upon success, -ERRNO upon failure.
*/
-static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
+static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
{
- char *p;
+ char *options, *tmp_options;
substring_t args[MAX_OPT_ARGS];
- int option;
- int ret;
+ char *p;
+ int option = 0;
+ char *s, *e;
+ int ret = 0;
/* setup defaults */
- v9ses->port = V9FS_PORT;
- v9ses->maxdata = 9000;
- v9ses->proto = PROTO_TCP;
- v9ses->extended = 1;
v9ses->afid = ~0;
v9ses->debug = 0;
- v9ses->rfdno = ~0;
- v9ses->wfdno = ~0;
v9ses->cache = 0;
+#ifdef CONFIG_9P_FSCACHE
+ v9ses->cachetag = NULL;
+#endif
+
+ if (!opts)
+ return 0;
- if (!options)
- return;
+ tmp_options = kstrdup(opts, GFP_KERNEL);
+ if (!tmp_options) {
+ ret = -ENOMEM;
+ goto fail_option_alloc;
+ }
+ options = tmp_options;
while ((p = strsep(&options, ",")) != NULL) {
int token;
continue;
token = match_token(p, tokens, args);
if (token < Opt_uname) {
- if ((ret = match_int(&args[0], &option)) < 0) {
+ int r = match_int(&args[0], &option);
+ if (r < 0) {
P9_DPRINTK(P9_DEBUG_ERROR,
"integer field, but no integer?\n");
+ ret = r;
continue;
}
}
p9_debug_level = option;
#endif
break;
- case Opt_port:
- v9ses->port = option;
- break;
- case Opt_msize:
- v9ses->maxdata = option;
- break;
- case Opt_uid:
- v9ses->uid = option;
+
+ case Opt_dfltuid:
+ v9ses->dfltuid = option;
break;
- case Opt_gid:
- v9ses->gid = option;
+ case Opt_dfltgid:
+ v9ses->dfltgid = option;
break;
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;
- break;
case Opt_uname:
- match_strcpy(v9ses->name, &args[0]);
+ match_strlcpy(v9ses->uname, &args[0], PATH_MAX);
break;
case Opt_remotename:
- match_strcpy(v9ses->remotename, &args[0]);
- break;
- case Opt_legacy:
- v9ses->extended = 0;
+ match_strlcpy(v9ses->aname, &args[0], PATH_MAX);
break;
case Opt_nodevmap:
v9ses->nodev = 1;
case Opt_cache_loose:
v9ses->cache = CACHE_LOOSE;
break;
+ case Opt_fscache:
+ v9ses->cache = CACHE_FSCACHE;
+ break;
+ case Opt_cachetag:
+#ifdef CONFIG_9P_FSCACHE
+ v9ses->cachetag = match_strdup(&args[0]);
+#endif
+ break;
+ case Opt_cache:
+ s = match_strdup(&args[0]);
+ if (!s) {
+ ret = -ENOMEM;
+ P9_DPRINTK(P9_DEBUG_ERROR,
+ "problem allocating copy of cache arg\n");
+ goto free_and_return;
+ }
+
+ if (strcmp(s, "loose") == 0)
+ v9ses->cache = CACHE_LOOSE;
+ else if (strcmp(s, "fscache") == 0)
+ v9ses->cache = CACHE_FSCACHE;
+ else
+ v9ses->cache = CACHE_NONE;
+ kfree(s);
+ break;
+
+ case Opt_access:
+ s = match_strdup(&args[0]);
+ if (!s) {
+ ret = -ENOMEM;
+ P9_DPRINTK(P9_DEBUG_ERROR,
+ "problem allocating copy of access arg\n");
+ goto free_and_return;
+ }
+
+ v9ses->flags &= ~V9FS_ACCESS_MASK;
+ if (strcmp(s, "user") == 0)
+ v9ses->flags |= V9FS_ACCESS_USER;
+ else if (strcmp(s, "any") == 0)
+ v9ses->flags |= V9FS_ACCESS_ANY;
+ else {
+ v9ses->flags |= V9FS_ACCESS_SINGLE;
+ v9ses->uid = simple_strtoul(s, &e, 10);
+ if (*e != '\0')
+ v9ses->uid = ~0;
+ }
+ kfree(s);
+ break;
+
default:
continue;
}
}
+
+free_and_return:
+ kfree(tmp_options);
+fail_option_alloc:
+ return ret;
}
/**
const char *dev_name, char *data)
{
int retval = -EINVAL;
- struct p9_transport *trans;
struct p9_fid *fid;
+ int rc;
- v9ses->name = __getname();
- if (!v9ses->name)
+ v9ses->uname = __getname();
+ if (!v9ses->uname)
return ERR_PTR(-ENOMEM);
- v9ses->remotename = __getname();
- if (!v9ses->remotename) {
- __putname(v9ses->name);
+ v9ses->aname = __getname();
+ if (!v9ses->aname) {
+ __putname(v9ses->uname);
return ERR_PTR(-ENOMEM);
}
- 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;
- goto error;
- };
+ spin_lock(&v9fs_sessionlist_lock);
+ list_add(&v9ses->slist, &v9fs_sessionlist);
+ spin_unlock(&v9fs_sessionlist_lock);
+
+ v9ses->flags = V9FS_ACCESS_USER;
+ strcpy(v9ses->uname, V9FS_DEFUSER);
+ strcpy(v9ses->aname, V9FS_DEFANAME);
+ v9ses->uid = ~0;
+ v9ses->dfltuid = V9FS_DEFUID;
+ v9ses->dfltgid = V9FS_DEFGID;
- if (IS_ERR(trans)) {
- retval = PTR_ERR(trans);
- trans = NULL;
+ rc = v9fs_parse_options(v9ses, data);
+ if (rc < 0) {
+ retval = rc;
goto error;
}
- v9ses->clnt = p9_client_create(trans, v9ses->maxdata + P9_IOHDRSZ,
- v9ses->extended);
-
+ v9ses->clnt = p9_client_create(dev_name, data);
if (IS_ERR(v9ses->clnt)) {
retval = PTR_ERR(v9ses->clnt);
v9ses->clnt = NULL;
goto error;
}
- fid = p9_client_attach(v9ses->clnt, NULL, v9ses->name,
- v9ses->remotename);
+ if (p9_is_proto_dotl(v9ses->clnt))
+ v9ses->flags |= V9FS_PROTO_2000L;
+ else if (p9_is_proto_dotu(v9ses->clnt))
+ v9ses->flags |= V9FS_PROTO_2000U;
+
+ v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
+
+ /* for legacy mode, fall back to V9FS_ACCESS_ANY */
+ if (!v9fs_proto_dotu(v9ses) &&
+ ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
+
+ v9ses->flags &= ~V9FS_ACCESS_MASK;
+ v9ses->flags |= V9FS_ACCESS_ANY;
+ v9ses->uid = ~0;
+ }
+
+ fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
+ v9ses->aname);
if (IS_ERR(fid)) {
retval = PTR_ERR(fid);
fid = NULL;
goto error;
}
+ if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
+ fid->uid = v9ses->uid;
+ else
+ fid->uid = ~0;
+
+#ifdef CONFIG_9P_FSCACHE
+ /* register the session for caching */
+ v9fs_cache_session_get_cookie(v9ses);
+#endif
+
return fid;
error:
- v9fs_session_close(v9ses);
return ERR_PTR(retval);
}
v9ses->clnt = NULL;
}
- __putname(v9ses->name);
- __putname(v9ses->remotename);
+#ifdef CONFIG_9P_FSCACHE
+ if (v9ses->fscache) {
+ v9fs_cache_session_put_cookie(v9ses);
+ kfree(v9ses->cachetag);
+ }
+#endif
+ __putname(v9ses->uname);
+ __putname(v9ses->aname);
+
+ spin_lock(&v9fs_sessionlist_lock);
+ list_del(&v9ses->slist);
+ spin_unlock(&v9fs_sessionlist_lock);
}
/**
- * v9fs_session_cancel - mark transport as disconnected
- * and cancel all pending requests.
+ * v9fs_session_cancel - terminate a session
+ * @v9ses: session to terminate
+ *
+ * mark transport as disconnected and cancel all pending requests.
*/
+
void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
p9_client_disconnect(v9ses->clnt);
extern int v9fs_error_init(void);
+static struct kobject *v9fs_kobj;
+
+#ifdef CONFIG_9P_FSCACHE
+/**
+ * caches_show - list caches associated with a session
+ *
+ * Returns the size of buffer written.
+ */
+
+static ssize_t caches_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ ssize_t n = 0, count = 0, limit = PAGE_SIZE;
+ struct v9fs_session_info *v9ses;
+
+ spin_lock(&v9fs_sessionlist_lock);
+ list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
+ if (v9ses->cachetag) {
+ n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
+ if (n < 0) {
+ count = n;
+ break;
+ }
+
+ count += n;
+ limit -= n;
+ }
+ }
+
+ spin_unlock(&v9fs_sessionlist_lock);
+ return count;
+}
+
+static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
+#endif /* CONFIG_9P_FSCACHE */
+
+static struct attribute *v9fs_attrs[] = {
+#ifdef CONFIG_9P_FSCACHE
+ &v9fs_attr_cache.attr,
+#endif
+ NULL,
+};
+
+static struct attribute_group v9fs_attr_group = {
+ .attrs = v9fs_attrs,
+};
+
+/**
+ * v9fs_sysfs_init - Initialize the v9fs sysfs interface
+ *
+ */
+
+static int v9fs_sysfs_init(void)
+{
+ v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
+ if (!v9fs_kobj)
+ return -ENOMEM;
+
+ if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
+ kobject_put(v9fs_kobj);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
/**
- * v9fs_init - Initialize module
+ * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
+ *
+ */
+
+static void v9fs_sysfs_cleanup(void)
+{
+ sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
+ kobject_put(v9fs_kobj);
+}
+
+/**
+ * init_v9fs - Initialize module
*
*/
static int __init init_v9fs(void)
{
+ int err;
printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
+ /* TODO: Setup list of registered trasnport modules */
+ err = register_filesystem(&v9fs_fs_type);
+ if (err < 0) {
+ printk(KERN_ERR "Failed to register filesystem\n");
+ return err;
+ }
+
+ err = v9fs_cache_register();
+ if (err < 0) {
+ printk(KERN_ERR "Failed to register v9fs for caching\n");
+ goto out_fs_unreg;
+ }
+
+ err = v9fs_sysfs_init();
+ if (err < 0) {
+ printk(KERN_ERR "Failed to register with sysfs\n");
+ goto out_sysfs_cleanup;
+ }
+
+ return 0;
+
+out_sysfs_cleanup:
+ v9fs_sysfs_cleanup();
+
+out_fs_unreg:
+ unregister_filesystem(&v9fs_fs_type);
- return register_filesystem(&v9fs_fs_type);
+ return err;
}
/**
- * v9fs_init - shutdown module
+ * exit_v9fs - shutdown module
*
*/
static void __exit exit_v9fs(void)
{
+ v9fs_sysfs_cleanup();
+ v9fs_cache_unregister();
unregister_filesystem(&v9fs_fs_type);
}