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authorVenkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>2011-01-25 15:40:54 -0800
committerEric Van Hensbergen <ericvh@gmail.com>2011-03-15 09:57:34 -0500
commite782ef71097e832f62256370a2fe231b9fba96cf (patch)
tree6de30a0ac9e6250a5b969ae35655715023724736
parent9332685dffed3b402816c3564342f3e2df0c83ef (diff)
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[fs/9P] Add posixacl mount option
The mount option access=client is overloaded as it assumes acl too. Adding posixacl option to enable POSIX ACLs makes it explicit and clear. Also it is convenient in the future to add other types of acls like richacls. Ideally, the access mode 'client' should be just like V9FS_ACCESS_USER except it underscores the location of access check. Traditional 9P protocol lets the server perform access checks but with this mode, all the access checks will be performed on the client itself. Server just follows the client's directive. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
-rw-r--r--fs/9p/acl.c8
-rw-r--r--fs/9p/v9fs.c27
-rw-r--r--fs/9p/v9fs.h6
-rw-r--r--fs/9p/vfs_super.c2
4 files changed, 31 insertions, 12 deletions
diff --git a/fs/9p/acl.c b/fs/9p/acl.c
index 0a2e480477a..1ee3434239c 100644
--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -59,7 +59,8 @@ int v9fs_get_acl(struct inode *inode, struct p9_fid *fid)
struct v9fs_session_info *v9ses;
v9ses = v9fs_inode2v9ses(inode);
- if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) {
+ if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
+ ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
set_cached_acl(inode, ACL_TYPE_DEFAULT, NULL);
set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
return 0;
@@ -104,9 +105,10 @@ int v9fs_check_acl(struct inode *inode, int mask, unsigned int flags)
return -ECHILD;
v9ses = v9fs_inode2v9ses(inode);
- if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) {
+ if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
+ ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
/*
- * On access = client mode get the acl
+ * On access = client and acl = on mode get the acl
* values from the server
*/
return 0;
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index d34f2937df6..f5a3200877d 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -55,7 +55,7 @@ enum {
/* Cache options */
Opt_cache_loose, Opt_fscache,
/* Access options */
- Opt_access,
+ Opt_access, Opt_posixacl,
/* Error token */
Opt_err
};
@@ -73,6 +73,7 @@ static const match_table_t tokens = {
{Opt_fscache, "fscache"},
{Opt_cachetag, "cachetag=%s"},
{Opt_access, "access=%s"},
+ {Opt_posixacl, "posixacl"},
{Opt_err, NULL}
};
@@ -194,13 +195,7 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
else if (strcmp(s, "any") == 0)
v9ses->flags |= V9FS_ACCESS_ANY;
else if (strcmp(s, "client") == 0) {
-#ifdef CONFIG_9P_FS_POSIX_ACL
v9ses->flags |= V9FS_ACCESS_CLIENT;
-#else
- P9_DPRINTK(P9_DEBUG_ERROR,
- "Not defined CONFIG_9P_FS_POSIX_ACL. "
- "Ignoring access=client option\n");
-#endif
} else {
v9ses->flags |= V9FS_ACCESS_SINGLE;
v9ses->uid = simple_strtoul(s, &e, 10);
@@ -210,6 +205,16 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
kfree(s);
break;
+ case Opt_posixacl:
+#ifdef CONFIG_9P_FS_POSIX_ACL
+ v9ses->flags |= V9FS_POSIX_ACL;
+#else
+ P9_DPRINTK(P9_DEBUG_ERROR,
+ "Not defined CONFIG_9P_FS_POSIX_ACL. "
+ "Ignoring posixacl option\n");
+#endif
+ break;
+
default:
continue;
}
@@ -304,6 +309,14 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
v9ses->flags |= V9FS_ACCESS_ANY;
v9ses->uid = ~0;
}
+ 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,
v9ses->aname);
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index c4b5d8864f0..6fa3cf5547d 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -28,8 +28,10 @@
* @V9FS_PROTO_2000L: whether or not to use 9P2000.l extensions
* @V9FS_ACCESS_SINGLE: only the mounting user can access the hierarchy
* @V9FS_ACCESS_USER: a new attach will be issued for every user (default)
+ * @V9FS_ACCESS_CLIENT: Just like user, but access check is performed on client.
* @V9FS_ACCESS_ANY: use a single attach for all users
* @V9FS_ACCESS_MASK: bit mask of different ACCESS options
+ * @V9FS_POSIX_ACL: POSIX ACLs are enforced
*
* Session flags reflect options selected by users at mount time
*/
@@ -37,13 +39,15 @@
V9FS_ACCESS_USER | \
V9FS_ACCESS_CLIENT)
#define V9FS_ACCESS_MASK V9FS_ACCESS_ANY
+#define V9FS_ACL_MASK V9FS_POSIX_ACL
enum p9_session_flags {
V9FS_PROTO_2000U = 0x01,
V9FS_PROTO_2000L = 0x02,
V9FS_ACCESS_SINGLE = 0x04,
V9FS_ACCESS_USER = 0x08,
- V9FS_ACCESS_CLIENT = 0x10
+ V9FS_ACCESS_CLIENT = 0x10,
+ V9FS_POSIX_ACL = 0x20
};
/* possible values of ->cache */
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index dbaabe3b813..4f14be585d6 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -91,7 +91,7 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
MS_NOATIME;
#ifdef CONFIG_9P_FS_POSIX_ACL
- if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)
+ if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
sb->s_flags |= MS_POSIXACL;
#endif