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authorM. Mohan Kumar <mohan@in.ibm.com>2010-09-28 19:59:25 +0530
committerEric Van Hensbergen <ericvh@gmail.com>2010-10-28 09:08:48 -0500
commit329176cc2c50e63c580ddaabb385876db5af1360 (patch)
treec7a95364c6339f75d37e1b63890d94114cd1935e
parent368c09d2a303c39e9f37193b23e945e6754cf0a7 (diff)
downloadlinux-2.6.38-lt-ux500-329176cc2c50e63c580ddaabb385876db5af1360.tar.gz
9p: Implement TREADLINK operation for 9p2000.L
Synopsis size[4] TReadlink tag[2] fid[4] size[4] RReadlink tag[2] target[s] Description Readlink is used to return the contents of the symoblic link referred by fid. Contents of symboic link is returned as a response. target[s] - Contents of the symbolic link referred by fid. Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
-rw-r--r--fs/9p/vfs_inode.c60
-rw-r--r--include/net/9p/9p.h2
-rw-r--r--include/net/9p/client.h1
-rw-r--r--net/9p/client.c26
4 files changed, 86 insertions, 3 deletions
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 68f02973c33..88419073c65 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1527,7 +1527,7 @@ static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
if (IS_ERR(fid))
return PTR_ERR(fid);
- if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))
+ if (!v9fs_proto_dotu(v9ses))
return -EBADF;
st = p9_client_stat(fid);
@@ -1995,6 +1995,60 @@ error:
return err;
}
+static int
+v9fs_vfs_readlink_dotl(struct dentry *dentry, char *buffer, int buflen)
+{
+ int retval;
+ struct p9_fid *fid;
+ char *target = NULL;
+
+ P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
+ retval = -EPERM;
+ fid = v9fs_fid_lookup(dentry);
+ if (IS_ERR(fid))
+ return PTR_ERR(fid);
+
+ retval = p9_client_readlink(fid, &target);
+ if (retval < 0)
+ return retval;
+
+ strncpy(buffer, target, buflen);
+ P9_DPRINTK(P9_DEBUG_VFS, "%s -> %s\n", dentry->d_name.name, buffer);
+
+ retval = strnlen(buffer, buflen);
+ return retval;
+}
+
+/**
+ * v9fs_vfs_follow_link_dotl - follow a symlink path
+ * @dentry: dentry for symlink
+ * @nd: nameidata
+ *
+ */
+
+static void *
+v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
+{
+ int len = 0;
+ char *link = __getname();
+
+ P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
+
+ if (!link)
+ link = ERR_PTR(-ENOMEM);
+ else {
+ len = v9fs_vfs_readlink_dotl(dentry, link, PATH_MAX);
+ if (len < 0) {
+ __putname(link);
+ link = ERR_PTR(len);
+ } else
+ link[min(len, PATH_MAX-1)] = 0;
+ }
+ nd_set_link(nd, link);
+
+ return NULL;
+}
+
static const struct inode_operations v9fs_dir_inode_operations_dotu = {
.create = v9fs_vfs_create,
.lookup = v9fs_vfs_lookup,
@@ -2064,8 +2118,8 @@ static const struct inode_operations v9fs_symlink_inode_operations = {
};
static const struct inode_operations v9fs_symlink_inode_operations_dotl = {
- .readlink = generic_readlink,
- .follow_link = v9fs_vfs_follow_link,
+ .readlink = v9fs_vfs_readlink_dotl,
+ .follow_link = v9fs_vfs_follow_link_dotl,
.put_link = v9fs_vfs_put_link,
.getattr = v9fs_vfs_getattr_dotl,
.setattr = v9fs_vfs_setattr_dotl,
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index 6367a71d84f..071fd7a8d78 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -153,6 +153,8 @@ enum p9_msg_t {
P9_RMKNOD,
P9_TRENAME = 20,
P9_RRENAME,
+ P9_TREADLINK = 22,
+ P9_RREADLINK,
P9_TGETATTR = 24,
P9_RGETATTR,
P9_TSETATTR = 26,
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 127c9f2a9cb..335b088e767 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -262,5 +262,6 @@ int p9_is_proto_dotu(struct p9_client *clnt);
int p9_is_proto_dotl(struct p9_client *clnt);
struct p9_fid *p9_client_xattrwalk(struct p9_fid *, const char *, u64 *);
int p9_client_xattrcreate(struct p9_fid *, const char *, u64, int);
+int p9_client_readlink(struct p9_fid *fid, char **target);
#endif /* NET_9P_CLIENT_H */
diff --git a/net/9p/client.c b/net/9p/client.c
index fc1b0579016..2bc99e9031e 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1870,3 +1870,29 @@ error:
return err;
}
EXPORT_SYMBOL(p9_client_getlock_dotl);
+
+int p9_client_readlink(struct p9_fid *fid, char **target)
+{
+ int err;
+ struct p9_client *clnt;
+ struct p9_req_t *req;
+
+ err = 0;
+ clnt = fid->clnt;
+ P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
+
+ req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
+ if (err) {
+ p9pdu_dump(1, req->rc);
+ goto error;
+ }
+ P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
+error:
+ p9_free_req(clnt, req);
+ return err;
+}
+EXPORT_SYMBOL(p9_client_readlink);