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authorYan, Zheng <zyan@redhat.com>2016-09-14 14:53:05 +0800
committerIlya Dryomov <idryomov@gmail.com>2016-10-03 16:13:50 +0200
commitce2728aaa82bbebae7d20345324af3f0f49eeb20 (patch)
tree731e14ae717753dbaf2771956266a1f36a6d856a /fs/ceph
parentdb4a63aab43b2040292b2023512864702b5f9799 (diff)
ceph: avoid accessing / when mounting a subpath
Accessing / causes failuire if the client has caps that restrict path Signed-off-by: Yan, Zheng <zyan@redhat.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/super.c49
1 files changed, 20 insertions, 29 deletions
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index e247f6f0feb7..a29ffce98187 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -396,10 +396,12 @@ static int parse_mount_options(struct ceph_mount_options **pfsopt,
*/
dev_name_end = strchr(dev_name, '/');
if (dev_name_end) {
- fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
- if (!fsopt->server_path) {
- err = -ENOMEM;
- goto out;
+ if (strlen(dev_name_end) > 1) {
+ fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
+ if (!fsopt->server_path) {
+ err = -ENOMEM;
+ goto out;
+ }
}
} else {
dev_name_end = dev_name + strlen(dev_name);
@@ -788,15 +790,10 @@ static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
struct inode *inode = req->r_target_inode;
req->r_target_inode = NULL;
dout("open_root_inode success\n");
- if (ceph_ino(inode) == CEPH_INO_ROOT &&
- fsc->sb->s_root == NULL) {
- root = d_make_root(inode);
- if (!root) {
- root = ERR_PTR(-ENOMEM);
- goto out;
- }
- } else {
- root = d_obtain_root(inode);
+ root = d_make_root(inode);
+ if (!root) {
+ root = ERR_PTR(-ENOMEM);
+ goto out;
}
ceph_init_dentry(root);
dout("open_root_inode success, root dentry is %p\n", root);
@@ -825,17 +822,24 @@ static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
mutex_lock(&fsc->client->mount_mutex);
if (!fsc->sb->s_root) {
+ const char *path;
err = __ceph_open_session(fsc->client, started);
if (err < 0)
goto out;
- dout("mount opening root\n");
- root = open_root_dentry(fsc, "", started);
+ if (!fsc->mount_options->server_path) {
+ path = "";
+ dout("mount opening path \\t\n");
+ } else {
+ path = fsc->mount_options->server_path + 1;
+ dout("mount opening path %s\n", path);
+ }
+ root = open_root_dentry(fsc, path, started);
if (IS_ERR(root)) {
err = PTR_ERR(root);
goto out;
}
- fsc->sb->s_root = root;
+ fsc->sb->s_root = dget(root);
first = 1;
err = ceph_fs_debugfs_init(fsc);
@@ -843,19 +847,6 @@ static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
goto fail;
}
- if (!fsc->mount_options->server_path) {
- root = fsc->sb->s_root;
- dget(root);
- } else {
- const char *path = fsc->mount_options->server_path + 1;
- dout("mount opening path %s\n", path);
- root = open_root_dentry(fsc, path, started);
- if (IS_ERR(root)) {
- err = PTR_ERR(root);
- goto fail;
- }
- }
-
fsc->mount_state = CEPH_MOUNT_MOUNTED;
dout("mount success\n");
mutex_unlock(&fsc->client->mount_mutex);