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Diffstat (limited to 'fs/9p/v9fs.c')
-rw-r--r--fs/9p/v9fs.c362
1 files changed, 288 insertions, 74 deletions
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index cf62b05e296..6894b085f0e 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -23,12 +23,15 @@
*
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/parser.h>
#include <linux/idr.h>
+#include <linux/slab.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
#include <net/9p/transport.h>
@@ -38,6 +41,7 @@
static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
static LIST_HEAD(v9fs_sessionlist);
+struct kmem_cache *v9fs_inode_cache;
/*
* Option Parsing (code inspired by NFS code)
@@ -52,9 +56,9 @@ enum {
/* Options that take no arguments */
Opt_nodevmap,
/* Cache options */
- Opt_cache_loose, Opt_fscache,
+ Opt_cache_loose, Opt_fscache, Opt_mmap,
/* Access options */
- Opt_access,
+ Opt_access, Opt_posixacl,
/* Error token */
Opt_err
};
@@ -70,11 +74,35 @@ static const match_table_t tokens = {
{Opt_cache, "cache=%s"},
{Opt_cache_loose, "loose"},
{Opt_fscache, "fscache"},
+ {Opt_mmap, "mmap"},
{Opt_cachetag, "cachetag=%s"},
{Opt_access, "access=%s"},
+ {Opt_posixacl, "posixacl"},
{Opt_err, NULL}
};
+/* Interpret mount options for cache mode */
+static int get_cache_mode(char *s)
+{
+ int version = -EINVAL;
+
+ if (!strcmp(s, "loose")) {
+ version = CACHE_LOOSE;
+ p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");
+ } else if (!strcmp(s, "fscache")) {
+ version = CACHE_FSCACHE;
+ p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");
+ } else if (!strcmp(s, "mmap")) {
+ version = CACHE_MMAP;
+ p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n");
+ } else if (!strcmp(s, "none")) {
+ version = CACHE_NONE;
+ p9_debug(P9_DEBUG_9P, "Cache mode: none\n");
+ } else
+ pr_info("Unknown Cache mode %s\n", s);
+ return version;
+}
+
/**
* v9fs_parse_options - parse mount options into session structure
* @v9ses: existing v9fs session information
@@ -84,7 +112,7 @@ static const match_table_t tokens = {
static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
{
- char *options;
+ char *options, *tmp_options;
substring_t args[MAX_OPT_ARGS];
char *p;
int option = 0;
@@ -94,7 +122,7 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
/* setup defaults */
v9ses->afid = ~0;
v9ses->debug = 0;
- v9ses->cache = 0;
+ v9ses->cache = CACHE_NONE;
#ifdef CONFIG_9P_FSCACHE
v9ses->cachetag = NULL;
#endif
@@ -102,26 +130,27 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
if (!opts)
return 0;
- options = kstrdup(opts, GFP_KERNEL);
- if (!options)
+ 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;
+ int token, r;
if (!*p)
continue;
token = match_token(p, tokens, args);
- if (token < Opt_uname) {
- int r = match_int(&args[0], &option);
+ switch (token) {
+ case Opt_debug:
+ r = match_int(&args[0], &option);
if (r < 0) {
- P9_DPRINTK(P9_DEBUG_ERROR,
- "integer field, but no integer?\n");
+ p9_debug(P9_DEBUG_ERROR,
+ "integer field, but no integer?\n");
ret = r;
continue;
}
- }
- switch (token) {
- case Opt_debug:
v9ses->debug = option;
#ifdef CONFIG_NET_9P_DEBUG
p9_debug_level = option;
@@ -129,19 +158,62 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
break;
case Opt_dfltuid:
- v9ses->dfltuid = option;
+ r = match_int(&args[0], &option);
+ if (r < 0) {
+ p9_debug(P9_DEBUG_ERROR,
+ "integer field, but no integer?\n");
+ ret = r;
+ continue;
+ }
+ v9ses->dfltuid = make_kuid(current_user_ns(), option);
+ if (!uid_valid(v9ses->dfltuid)) {
+ p9_debug(P9_DEBUG_ERROR,
+ "uid field, but not a uid?\n");
+ ret = -EINVAL;
+ continue;
+ }
break;
case Opt_dfltgid:
- v9ses->dfltgid = option;
+ r = match_int(&args[0], &option);
+ if (r < 0) {
+ p9_debug(P9_DEBUG_ERROR,
+ "integer field, but no integer?\n");
+ ret = r;
+ continue;
+ }
+ v9ses->dfltgid = make_kgid(current_user_ns(), option);
+ if (!gid_valid(v9ses->dfltgid)) {
+ p9_debug(P9_DEBUG_ERROR,
+ "gid field, but not a gid?\n");
+ ret = -EINVAL;
+ continue;
+ }
break;
case Opt_afid:
+ r = match_int(&args[0], &option);
+ if (r < 0) {
+ p9_debug(P9_DEBUG_ERROR,
+ "integer field, but no integer?\n");
+ ret = r;
+ continue;
+ }
v9ses->afid = option;
break;
case Opt_uname:
- match_strlcpy(v9ses->uname, &args[0], PATH_MAX);
+ kfree(v9ses->uname);
+ v9ses->uname = match_strdup(&args[0]);
+ if (!v9ses->uname) {
+ ret = -ENOMEM;
+ goto free_and_return;
+ }
break;
case Opt_remotename:
- match_strlcpy(v9ses->aname, &args[0], PATH_MAX);
+ kfree(v9ses->aname);
+ v9ses->aname = match_strdup(&args[0]);
+ if (!v9ses->aname) {
+ ret = -ENOMEM;
+ goto free_and_return;
+ }
break;
case Opt_nodevmap:
v9ses->nodev = 1;
@@ -152,6 +224,9 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
case Opt_fscache:
v9ses->cache = CACHE_FSCACHE;
break;
+ case Opt_mmap:
+ v9ses->cache = CACHE_MMAP;
+ break;
case Opt_cachetag:
#ifdef CONFIG_9P_FSCACHE
v9ses->cachetag = match_strdup(&args[0]);
@@ -159,48 +234,79 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
break;
case Opt_cache:
s = match_strdup(&args[0]);
- if (!s)
- goto fail_option_alloc;
-
- if (strcmp(s, "loose") == 0)
- v9ses->cache = CACHE_LOOSE;
- else if (strcmp(s, "fscache") == 0)
- v9ses->cache = CACHE_FSCACHE;
- else
- v9ses->cache = CACHE_NONE;
+ if (!s) {
+ ret = -ENOMEM;
+ p9_debug(P9_DEBUG_ERROR,
+ "problem allocating copy of cache arg\n");
+ goto free_and_return;
+ }
+ ret = get_cache_mode(s);
+ if (ret == -EINVAL) {
+ kfree(s);
+ goto free_and_return;
+ }
+
+ v9ses->cache = ret;
kfree(s);
break;
case Opt_access:
s = match_strdup(&args[0]);
- if (!s)
- goto fail_option_alloc;
+ if (!s) {
+ ret = -ENOMEM;
+ p9_debug(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 {
+ else if (strcmp(s, "client") == 0) {
+ v9ses->flags |= V9FS_ACCESS_CLIENT;
+ } else {
+ uid_t uid;
v9ses->flags |= V9FS_ACCESS_SINGLE;
- v9ses->uid = simple_strtoul(s, &e, 10);
- if (*e != '\0')
- v9ses->uid = ~0;
+ uid = simple_strtoul(s, &e, 10);
+ if (*e != '\0') {
+ ret = -EINVAL;
+ pr_info("Unknown access argument %s\n",
+ s);
+ kfree(s);
+ goto free_and_return;
+ }
+ v9ses->uid = make_kuid(current_user_ns(), uid);
+ if (!uid_valid(v9ses->uid)) {
+ ret = -EINVAL;
+ pr_info("Uknown uid %s\n", s);
+ kfree(s);
+ goto free_and_return;
+ }
}
+
kfree(s);
break;
+ case Opt_posixacl:
+#ifdef CONFIG_9P_FS_POSIX_ACL
+ v9ses->flags |= V9FS_POSIX_ACL;
+#else
+ p9_debug(P9_DEBUG_ERROR,
+ "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
+#endif
+ break;
+
default:
continue;
}
}
- kfree(options);
- return ret;
+free_and_return:
+ kfree(tmp_options);
fail_option_alloc:
- P9_DPRINTK(P9_DEBUG_ERROR,
- "failed to allocate copy of option argument\n");
- return -ENOMEM;
+ return ret;
}
/**
@@ -218,68 +324,97 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
struct p9_fid *fid;
int rc;
- v9ses->uname = __getname();
+ v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
if (!v9ses->uname)
return ERR_PTR(-ENOMEM);
- v9ses->aname = __getname();
+ v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
if (!v9ses->aname) {
- __putname(v9ses->uname);
+ kfree(v9ses->uname);
return ERR_PTR(-ENOMEM);
}
+ init_rwsem(&v9ses->rename_sem);
+
+ rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY);
+ if (rc) {
+ kfree(v9ses->aname);
+ kfree(v9ses->uname);
+ return ERR_PTR(rc);
+ }
spin_lock(&v9fs_sessionlist_lock);
list_add(&v9ses->slist, &v9fs_sessionlist);
spin_unlock(&v9fs_sessionlist_lock);
- v9ses->flags = V9FS_EXTENDED | V9FS_ACCESS_USER;
- strcpy(v9ses->uname, V9FS_DEFUSER);
- strcpy(v9ses->aname, V9FS_DEFANAME);
- v9ses->uid = ~0;
+ v9ses->uid = INVALID_UID;
v9ses->dfltuid = V9FS_DEFUID;
v9ses->dfltgid = V9FS_DEFGID;
- rc = v9fs_parse_options(v9ses, data);
- if (rc < 0) {
- retval = rc;
- goto error;
- }
-
v9ses->clnt = p9_client_create(dev_name, data);
if (IS_ERR(v9ses->clnt)) {
retval = PTR_ERR(v9ses->clnt);
v9ses->clnt = NULL;
- P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
+ p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
goto error;
}
- if (!v9ses->clnt->dotu)
- v9ses->flags &= ~V9FS_EXTENDED;
+ v9ses->flags = V9FS_ACCESS_USER;
+
+ if (p9_is_proto_dotl(v9ses->clnt)) {
+ v9ses->flags = V9FS_ACCESS_CLIENT;
+ v9ses->flags |= V9FS_PROTO_2000L;
+ } else if (p9_is_proto_dotu(v9ses->clnt)) {
+ v9ses->flags |= V9FS_PROTO_2000U;
+ }
+
+ rc = v9fs_parse_options(v9ses, data);
+ if (rc < 0) {
+ retval = rc;
+ goto error;
+ }
v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
+ if (!v9fs_proto_dotl(v9ses) &&
+ ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
+ /*
+ * We support ACCESS_CLIENT only for dotl.
+ * Fall back to ACCESS_USER
+ */
+ v9ses->flags &= ~V9FS_ACCESS_MASK;
+ v9ses->flags |= V9FS_ACCESS_USER;
+ }
+ /*FIXME !! */
/* for legacy mode, fall back to V9FS_ACCESS_ANY */
- if (!v9fs_extended(v9ses) &&
+ if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
v9ses->flags &= ~V9FS_ACCESS_MASK;
v9ses->flags |= V9FS_ACCESS_ANY;
- v9ses->uid = ~0;
+ v9ses->uid = INVALID_UID;
+ }
+ if (!v9fs_proto_dotl(v9ses) ||
+ !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
+ /*
+ * We support ACL checks on clinet only if the protocol is
+ * 9P2000.L and access is V9FS_ACCESS_CLIENT.
+ */
+ v9ses->flags &= ~V9FS_ACL_MASK;
}
- fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
+ fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID,
v9ses->aname);
if (IS_ERR(fid)) {
retval = PTR_ERR(fid);
fid = NULL;
- P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
+ p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
goto error;
}
if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
fid->uid = v9ses->uid;
else
- fid->uid = ~0;
+ fid->uid = INVALID_UID;
#ifdef CONFIG_9P_FSCACHE
/* register the session for caching */
@@ -289,6 +424,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
return fid;
error:
+ bdi_destroy(&v9ses->bdi);
return ERR_PTR(retval);
}
@@ -311,8 +447,10 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
kfree(v9ses->cachetag);
}
#endif
- __putname(v9ses->uname);
- __putname(v9ses->aname);
+ kfree(v9ses->uname);
+ kfree(v9ses->aname);
+
+ bdi_destroy(&v9ses->bdi);
spin_lock(&v9fs_sessionlist_lock);
list_del(&v9ses->slist);
@@ -327,10 +465,23 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
*/
void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
- P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
+ p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
p9_client_disconnect(v9ses->clnt);
}
+/**
+ * v9fs_session_begin_cancel - Begin terminate of a session
+ * @v9ses: session to terminate
+ *
+ * After this call we don't allow any request other than clunk.
+ */
+
+void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
+{
+ p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
+ p9_client_begin_disconnect(v9ses->clnt);
+}
+
extern int v9fs_error_init(void);
static struct kobject *v9fs_kobj;
@@ -386,7 +537,7 @@ static struct attribute_group v9fs_attr_group = {
*
*/
-static int v9fs_sysfs_init(void)
+static int __init v9fs_sysfs_init(void)
{
v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
if (!v9fs_kobj)
@@ -411,6 +562,69 @@ static void v9fs_sysfs_cleanup(void)
kobject_put(v9fs_kobj);
}
+static void v9fs_inode_init_once(void *foo)
+{
+ struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
+#ifdef CONFIG_9P_FSCACHE
+ v9inode->fscache = NULL;
+#endif
+ memset(&v9inode->qid, 0, sizeof(v9inode->qid));
+ inode_init_once(&v9inode->vfs_inode);
+}
+
+/**
+ * v9fs_init_inode_cache - initialize a cache for 9P
+ * Returns 0 on success.
+ */
+static int v9fs_init_inode_cache(void)
+{
+ v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
+ sizeof(struct v9fs_inode),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ v9fs_inode_init_once);
+ if (!v9fs_inode_cache)
+ return -ENOMEM;
+
+ return 0;
+}
+
+/**
+ * v9fs_destroy_inode_cache - destroy the cache of 9P inode
+ *
+ */
+static void v9fs_destroy_inode_cache(void)
+{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(v9fs_inode_cache);
+}
+
+static int v9fs_cache_register(void)
+{
+ int ret;
+ ret = v9fs_init_inode_cache();
+ if (ret < 0)
+ return ret;
+#ifdef CONFIG_9P_FSCACHE
+ ret = fscache_register_netfs(&v9fs_cache_netfs);
+ if (ret < 0)
+ v9fs_destroy_inode_cache();
+#endif
+ return ret;
+}
+
+static void v9fs_cache_unregister(void)
+{
+ v9fs_destroy_inode_cache();
+#ifdef CONFIG_9P_FSCACHE
+ fscache_unregister_netfs(&v9fs_cache_netfs);
+#endif
+}
+
/**
* init_v9fs - Initialize module
*
@@ -419,23 +633,23 @@ static void v9fs_sysfs_cleanup(void)
static int __init init_v9fs(void)
{
int err;
- printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
+ pr_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;
+ pr_err("Failed to register v9fs for caching\n");
+ return err;
}
err = v9fs_sysfs_init();
if (err < 0) {
- printk(KERN_ERR "Failed to register with sysfs\n");
+ pr_err("Failed to register with sysfs\n");
+ goto out_cache;
+ }
+ err = register_filesystem(&v9fs_fs_type);
+ if (err < 0) {
+ pr_err("Failed to register filesystem\n");
goto out_sysfs_cleanup;
}
@@ -444,8 +658,8 @@ static int __init init_v9fs(void)
out_sysfs_cleanup:
v9fs_sysfs_cleanup();
-out_fs_unreg:
- unregister_filesystem(&v9fs_fs_type);
+out_cache:
+ v9fs_cache_unregister();
return err;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 07:46:35 +0000