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CIFS: make 'nodfs' mount opt a superblock flag 

tcon->Flags is only used by SMB1 code and changing it is not permanent
(you lose the setting on tcon reconnect).

* Move the setting to superblock flags (per mount-points).
* Make automount callback exit early when flag present
* Make dfs resolving happening in mount syscall exit early if flag present

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Pavel Shilovsky <pshilov@microsoft.com>
hifive-unleashed-5.1
Aurelien Aptel 2018-09-20 18:10:25 -07:00 committed by Steve French
parent 9e1a37dad4
commit 8393072bab
4 changed files with 14 additions and 5 deletions
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7
fs/cifs/cifs_dfs_ref.c
View File

@ -304,12 +304,17 @@ static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
*/
mnt = ERR_PTR(-ENOMEM);
cifs_sb = CIFS_SB(mntpt->d_sb);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) {
mnt = ERR_PTR(-EREMOTE);
goto cdda_exit;
}
/* always use tree name prefix */
full_path = build_path_from_dentry_optional_prefix(mntpt, true);
if (full_path == NULL)
goto cdda_exit;
cifs_sb = CIFS_SB(mntpt->d_sb);
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink)) {
mnt = ERR_CAST(tlink);

1
fs/cifs/cifs_fs_sb.h
View File

@ -51,6 +51,7 @@
*/
#define CIFS_MOUNT_UID_FROM_ACL 0x2000000 /* try to get UID via special SID */
#define CIFS_MOUNT_NO_HANDLE_CACHE 0x4000000 /* disable caching dir handles */
#define CIFS_MOUNT_NO_DFS 0x8000000 /* disable DFS resolving */
struct cifs_sb_info {
struct rb_root tlink_tree;

2
fs/cifs/cifsfs.c
View File

@ -500,6 +500,8 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
seq_puts(s, ",unix");
else
seq_puts(s, ",nounix");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
seq_puts(s, ",nodfs");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
seq_puts(s, ",posixpaths");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)

9
fs/cifs/connect.c
View File

@ -3086,10 +3086,6 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
if (rc)
goto out_fail;
if (volume_info->nodfs) {
tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
}
tcon->use_persistent = false;
/* check if SMB2 or later, CIFS does not support persistent handles */
if (volume_info->persistent) {
@ -3664,6 +3660,8 @@ int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
cifs_sb->actimeo = pvolume_info->actimeo;
cifs_sb->local_nls = pvolume_info->local_nls;
if (pvolume_info->nodfs)
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_DFS;
if (pvolume_info->noperm)
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
if (pvolume_info->setuids)
@ -3820,6 +3818,9 @@ expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
struct dfs_info3_param *referrals = NULL;
char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
return -EREMOTE;
full_path = build_unc_path_to_root(volume_info, cifs_sb);
if (IS_ERR(full_path))
return PTR_ERR(full_path);