static void*
cifs_dfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
{
struct dfs_info3_param *referrals = NULL;
unsigned int num_referrals = 0;
struct cifs_sb_info *cifs_sb;
struct cifsSesInfo *ses;
char *full_path = NULL;
int xid, i;
int rc = 0;
struct vfsmount *mnt = ERR_PTR(-ENOENT);
cFYI(1, "in %s", __func__);
BUG_ON(IS_ROOT(dentry));
xid = GetXid();
dput(nd->path.dentry);
nd->path.dentry = dget(dentry);
cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
ses = cifs_sb->tcon->ses;
if (!ses) {
rc = -EINVAL;
goto out_err;
}
/*
* The MSDFS spec states that paths in DFS referral requests and
* responses must be prefixed by a single '\' character instead of
* the double backslashes usually used in the UNC. This function
* gives us the latter, so we must adjust the result.
*/
full_path = build_path_from_dentry(dentry);
if (full_path == NULL) {
rc = -ENOMEM;
goto out_err;
}
rc = get_dfs_path(xid, ses , full_path + 1, cifs_sb->local_nls,
&num_referrals, &referrals,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
for (i = 0; i < num_referrals; i++) {
int len;
dump_referral(referrals+i);
/* connect to a node */
len = strlen(referrals[i].node_name);
if (len < 2) {
cERROR(1, "%s: Net Address path too short: %s",
__func__, referrals[i].node_name);
rc = -EINVAL;
goto out_err;
}
mnt = cifs_dfs_do_refmount(cifs_sb,
full_path, referrals + i);
cFYI(1, "%s: cifs_dfs_do_refmount:%s , mnt:%p", __func__,
referrals[i].node_name, mnt);
/* complete mount procedure if we accured submount */
if (!IS_ERR(mnt))
break;
}
/* we need it cause for() above could exit without valid submount */
rc = PTR_ERR(mnt);
if (IS_ERR(mnt))
goto out_err;
rc = add_mount_helper(mnt, nd, &cifs_dfs_automount_list);
out:
FreeXid(xid);
free_dfs_info_array(referrals, num_referrals);
kfree(full_path);
cFYI(1, "leaving %s" , __func__);
return ERR_PTR(rc);
out_err:
path_put(&nd->path);
goto out;
}
/*
* Create a vfsmount that we can automount
*/
static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
{
struct dfs_info3_param *referrals = NULL;
unsigned int num_referrals = 0;
struct cifs_sb_info *cifs_sb;
struct cifs_ses *ses;
char *full_path;
unsigned int xid;
int i;
int rc;
struct vfsmount *mnt;
struct tcon_link *tlink;
cifs_dbg(FYI, "in %s\n", __func__);
BUG_ON(IS_ROOT(mntpt));
/*
* The MSDFS spec states that paths in DFS referral requests and
* responses must be prefixed by a single '\' character instead of
* the double backslashes usually used in the UNC. This function
* gives us the latter, so we must adjust the result.
*/
mnt = ERR_PTR(-ENOMEM);
full_path = build_path_from_dentry(mntpt);
if (full_path == NULL)
goto cdda_exit;
cifs_sb = CIFS_SB(d_inode(mntpt)->i_sb);
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink)) {
mnt = ERR_CAST(tlink);
goto free_full_path;
}
ses = tlink_tcon(tlink)->ses;
xid = get_xid();
rc = get_dfs_path(xid, ses, full_path + 1, cifs_sb->local_nls,
&num_referrals, &referrals,
cifs_remap(cifs_sb));
free_xid(xid);
cifs_put_tlink(tlink);
mnt = ERR_PTR(-ENOENT);
for (i = 0; i < num_referrals; i++) {
int len;
dump_referral(referrals + i);
/* connect to a node */
len = strlen(referrals[i].node_name);
if (len < 2) {
cifs_dbg(VFS, "%s: Net Address path too short: %s\n",
__func__, referrals[i].node_name);
mnt = ERR_PTR(-EINVAL);
break;
}
mnt = cifs_dfs_do_refmount(cifs_sb,
full_path, referrals + i);
cifs_dbg(FYI, "%s: cifs_dfs_do_refmount:%s , mnt:%p\n",
__func__, referrals[i].node_name, mnt);
if (!IS_ERR(mnt))
goto success;
}
/* no valid submounts were found; return error from get_dfs_path() by
* preference */
if (rc != 0)
mnt = ERR_PTR(rc);
success:
free_dfs_info_array(referrals, num_referrals);
free_full_path:
kfree(full_path);
cdda_exit:
cifs_dbg(FYI, "leaving %s\n" , __func__);
return mnt;
}
static void *cifs_dfs_follow_mountpoint(struct dentry *dentry,
struct nameidata *nd)
{
DFS_INFO3_PARAM *referrals = NULL;
unsigned int num_referrals = 0;
struct cifs_sb_info *cifs_sb;
struct cifsSesInfo *ses;
char *full_path = NULL;
int xid, i;
int rc = 0;
struct vfsmount *mnt = ERR_PTR(-ENOENT);
cFYI(1, ("in %s", __FUNCTION__ ));
BUG_ON(IS_ROOT(dentry));
xid = GetXid();
dput(nd->dentry);
nd->dentry = dget(dentry);
if (d_mountpoint(nd->dentry)) {
goto out_follow;
}
if ( dentry->d_inode == NULL ) {
rc = -EINVAL;
goto out_err;
}
cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
ses = cifs_sb->tcon->ses;
if ( !ses ) {
rc = -EINVAL;
goto out_err;
}
full_path = build_full_dfs_path_from_dentry(dentry);
if ( full_path == NULL ) {
rc = -ENOMEM;
goto out_err;
}
rc = get_dfs_path(xid, ses , full_path, cifs_sb->local_nls,
&num_referrals, &referrals,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
for (i = 0; i < num_referrals; i++) {
cFYI(1, ("%s: ref path: %s", __FUNCTION__,
referrals[i].path_name));
cFYI(1, ("%s: node path: %s", __FUNCTION__,
referrals[i].node_name ));
cFYI(1, ("%s: fl: %hd, serv_type: %hd, ref_flags: %hd, "
"path_consumed: %hd", __FUNCTION__,
referrals[i].flags, referrals[i].server_type,
referrals[i].ref_flag, referrals[i].PathConsumed));
/* connect to storage node */
if (referrals[i].flags & DFSREF_STORAGE_SERVER) {
int len;
len = strlen(referrals[i].node_name);
if (len < 2) {
cERROR(1, ("%s: Net Address path too short: %s",
__FUNCTION__, referrals[i].node_name ));
rc = -EINVAL;
goto out_err;
} else {
mnt = cifs_dfs_do_refmount(nd->mnt,
nd->dentry,
referrals[i].node_name);
cFYI(1, ("%s: cifs_dfs_do_refmount:%s , mnt:%p",
__FUNCTION__,
referrals[i].node_name, mnt));
if ( !rc ) {
/* have server so stop here & return */
break;
}
}
}
}
rc = PTR_ERR(mnt);
if (IS_ERR(mnt))
goto out_err;
mntget(mnt);
rc = do_add_mount(mnt, nd, nd->mnt->mnt_flags,
&cifs_dfs_automount_list);
if (rc < 0) {
mntput(mnt);
if (rc == -EBUSY)
goto out_follow;
goto out_err;
}
mntput(nd->mnt);
dput(nd->dentry);
nd->mnt = mnt;
nd->dentry = dget(mnt->mnt_root);
out:
FreeXid(xid);
free_dfs_info_array(referrals, num_referrals);
cFYI(1, ("leaving %s", __FUNCTION__ ));
return ERR_PTR(rc);
out_err:
if ( full_path ) kfree(full_path);
path_release(nd);
goto out;
out_follow:
while (d_mountpoint(nd->dentry) && follow_down(&nd->mnt, &nd->dentry))
;
rc = 0;
goto out;
}
static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
{
struct dfs_info3_param *referrals = NULL;
unsigned int num_referrals = 0;
struct cifs_sb_info *cifs_sb;
struct cifs_ses *ses;
char *full_path;
int xid, i;
int rc;
struct vfsmount *mnt;
struct tcon_link *tlink;
cFYI(1, "in %s", __func__);
BUG_ON(IS_ROOT(mntpt));
mnt = ERR_PTR(-ENOMEM);
full_path = build_path_from_dentry(mntpt);
if (full_path == NULL)
goto cdda_exit;
cifs_sb = CIFS_SB(mntpt->d_inode->i_sb);
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink)) {
mnt = ERR_CAST(tlink);
goto free_full_path;
}
ses = tlink_tcon(tlink)->ses;
xid = GetXid();
rc = get_dfs_path(xid, ses, full_path + 1, cifs_sb->local_nls,
&num_referrals, &referrals,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
FreeXid(xid);
cifs_put_tlink(tlink);
mnt = ERR_PTR(-ENOENT);
for (i = 0; i < num_referrals; i++) {
int len;
dump_referral(referrals + i);
len = strlen(referrals[i].node_name);
if (len < 2) {
cERROR(1, "%s: Net Address path too short: %s",
__func__, referrals[i].node_name);
mnt = ERR_PTR(-EINVAL);
break;
}
mnt = cifs_dfs_do_refmount(cifs_sb,
full_path, referrals + i);
cFYI(1, "%s: cifs_dfs_do_refmount:%s , mnt:%p", __func__,
referrals[i].node_name, mnt);
if (!IS_ERR(mnt))
goto success;
}
if (rc != 0)
mnt = ERR_PTR(rc);
success:
free_dfs_info_array(referrals, num_referrals);
free_full_path:
kfree(full_path);
cdda_exit:
cFYI(1, "leaving %s" , __func__);
return mnt;
}
static void*
cifs_dfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
{
struct dfs_info3_param *referrals = NULL;
unsigned int num_referrals = 0;
struct cifs_sb_info *cifs_sb;
struct cifsSesInfo *ses;
char *full_path = NULL;
int xid, i;
int rc = 0;
struct vfsmount *mnt = ERR_PTR(-ENOENT);
cFYI(1, ("in %s", __func__));
BUG_ON(IS_ROOT(dentry));
xid = GetXid();
dput(nd->path.dentry);
nd->path.dentry = dget(dentry);
cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
ses = cifs_sb->tcon->ses;
if (!ses) {
rc = -EINVAL;
goto out_err;
}
full_path = build_path_from_dentry(dentry);
if (full_path == NULL) {
rc = -ENOMEM;
goto out_err;
}
rc = get_dfs_path(xid, ses , full_path, cifs_sb->local_nls,
&num_referrals, &referrals,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
for (i = 0; i < num_referrals; i++) {
dump_referral(referrals+i);
/* connect to a storage node */
if (referrals[i].flags & DFSREF_STORAGE_SERVER) {
int len;
len = strlen(referrals[i].node_name);
if (len < 2) {
cERROR(1, ("%s: Net Address path too short: %s",
__func__, referrals[i].node_name));
rc = -EINVAL;
goto out_err;
}
mnt = cifs_dfs_do_refmount(nd->path.mnt,
nd->path.dentry,
referrals + i);
cFYI(1, ("%s: cifs_dfs_do_refmount:%s , mnt:%p",
__func__,
referrals[i].node_name, mnt));
/* complete mount procedure if we accured submount */
if (!IS_ERR(mnt))
break;
}
}
/* we need it cause for() above could exit without valid submount */
rc = PTR_ERR(mnt);
if (IS_ERR(mnt))
goto out_err;
nd->path.mnt->mnt_flags |= MNT_SHRINKABLE;
rc = add_mount_helper(mnt, nd, &cifs_dfs_automount_list);
out:
FreeXid(xid);
free_dfs_info_array(referrals, num_referrals);
kfree(full_path);
cFYI(1, ("leaving %s" , __func__));
return ERR_PTR(rc);
out_err:
path_put(&nd->path);
goto out;
}