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ceph: fix mounting same fs multiple times 

Now __ceph_open_session() only accepts closed client. An opened
client will tigger BUG_ON().

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2016-03-12 13:20:48 +08:00 committed by Ilya Dryomov
parent 4531126753
commit 132ca7e1de
1 changed files with 15 additions and 18 deletions
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33
fs/ceph/super.c
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@ -793,22 +793,20 @@ static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
struct dentry *root;
int first = 0; /* first vfsmount for this super_block */
dout("mount start\n");
dout("mount start %p\n", fsc);
mutex_lock(&fsc->client->mount_mutex);
err = __ceph_open_session(fsc->client, started);
if (err < 0)
goto out;
if (!fsc->sb->s_root) {
err = __ceph_open_session(fsc->client, started);
if (err < 0)
goto out;
dout("mount opening root\n");
root = open_root_dentry(fsc, "", started);
if (IS_ERR(root)) {
err = PTR_ERR(root);
goto out;
}
if (fsc->sb->s_root) {
dput(root);
} else {
dout("mount opening root\n");
root = open_root_dentry(fsc, "", started);
if (IS_ERR(root)) {
err = PTR_ERR(root);
goto out;
}
fsc->sb->s_root = root;
first = 1;
@ -818,6 +816,7 @@ static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
}
if (path[0] == 0) {
root = fsc->sb->s_root;
dget(root);
} else {
dout("mount opening base mountpoint\n");
@ -833,16 +832,14 @@ static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
mutex_unlock(&fsc->client->mount_mutex);
return root;
out:
mutex_unlock(&fsc->client->mount_mutex);
return ERR_PTR(err);
fail:
if (first) {
dput(fsc->sb->s_root);
fsc->sb->s_root = NULL;
}
goto out;
out:
mutex_unlock(&fsc->client->mount_mutex);
return ERR_PTR(err);
}
static int ceph_set_super(struct super_block *s, void *data)