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DFS (smb3 global namespace) client fix

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Merge tag '6.13-rc6-SMB3-client-fix' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fix from Steve French:

 - fix unneeded session setup retry due to stale password e.g. for DFS
   automounts

* tag '6.13-rc6-SMB3-client-fix' of git://git.samba.org/sfrench/cifs-2.6:
  smb: client: sync the root session and superblock context passwords before automounting
This commit is contained in:
Linus Torvalds 2025-01-11 10:49:50 -08:00
commit 57162361c3
1 changed files with 18 additions and 1 deletions
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19
fs/smb/client/namespace.c
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@ -196,11 +196,28 @@ static struct vfsmount *cifs_do_automount(struct path *path)
struct smb3_fs_context tmp;
char *full_path;
struct vfsmount *mnt;
struct cifs_sb_info *mntpt_sb;
struct cifs_ses *ses;
if (IS_ROOT(mntpt))
return ERR_PTR(-ESTALE);
cur_ctx = CIFS_SB(mntpt->d_sb)->ctx;
mntpt_sb = CIFS_SB(mntpt->d_sb);
ses = cifs_sb_master_tcon(mntpt_sb)->ses;
cur_ctx = mntpt_sb->ctx;
/*
* At this point, the root session should be in the mntpt sb. We should
* bring the sb context passwords in sync with the root session's
* passwords. This would help prevent unnecessary retries and password
* swaps for automounts.
*/
mutex_lock(&ses->session_mutex);
rc = smb3_sync_session_ctx_passwords(mntpt_sb, ses);
mutex_unlock(&ses->session_mutex);
if (rc)
return ERR_PTR(rc);
fc = fs_context_for_submount(path->mnt->mnt_sb->s_type, mntpt);
if (IS_ERR(fc))