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[fs/9P] Add posixacl mount option

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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>
This commit is contained in:
Venkateswararao Jujjuri (JV) 2011-01-25 15:40:54 -08:00 committed by Eric Van Hensbergen
parent 9332685dff
commit e782ef7109
4 changed files with 31 additions and 12 deletions
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8
fs/9p/acl.c
View File

@ -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;

27
fs/9p/v9fs.c
View File

@ -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);

6
fs/9p/v9fs.h
View File

@ -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 */

2
fs/9p/vfs_super.c
View File

@ -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