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smb: client: fix DFS failover in multiuser mounts

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For sessions and tcons created on behalf of new users accessing a
multiuser mount, matching their sessions in tcon_super_cb() with
master tcon will always lead to false as every new user will have its
own session and tcon.

All multiuser sessions, however, will inherit ->dfs_root_ses from
master tcon, so match it instead.

Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2024-09-18 02:04:23 -03:00 committed by Steve French
parent 85633c00ad
commit 0826b134c0
1 changed files with 2 additions and 1 deletions
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3
fs/smb/client/misc.c
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@ -1111,7 +1111,8 @@ static void tcon_super_cb(struct super_block *sb, void *arg)
t2 = cifs_sb_master_tcon(cifs_sb);
spin_lock(&t2->tc_lock);
if (t1->ses == t2->ses &&
if ((t1->ses == t2->ses ||
t1->ses->dfs_root_ses == t2->ses->dfs_root_ses) &&
t1->ses->server == t2->ses->server &&
t2->origin_fullpath &&
dfs_src_pathname_equal(t2->origin_fullpath, t1->origin_fullpath))