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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>
This commit is contained in:
Yan, Zheng 2016-09-14 14:53:05 +08:00 committed by Ilya Dryomov
parent db4a63aab4
commit ce2728aaa8
1 changed files with 20 additions and 29 deletions
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49
fs/ceph/super.c
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@ -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);