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smb: client: improve DFS mount check

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Some servers may return error codes from REQ_GET_DFS_REFERRAL requests
that are unexpected by the client, so to make it easier, assume
non-DFS mounts when the client can't get the initial DFS referral of
@ctx->UNC in dfs_mount_share().

Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2023-06-27 21:24:50 -03:00 committed by Steve French
parent 3ae872de41
commit 5f2a0afa98
1 changed files with 3 additions and 2 deletions
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5
fs/smb/client/dfs.c
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@ -264,8 +264,9 @@ int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs)
if (!nodfs) {
rc = dfs_get_referral(mnt_ctx, ctx->UNC + 1, NULL, NULL);
if (rc) {
if (rc != -ENOENT && rc != -EOPNOTSUPP && rc != -EIO)
return rc;
cifs_dbg(FYI, "%s: no dfs referral for %s: %d\n",
__func__, ctx->UNC + 1, rc);
cifs_dbg(FYI, "%s: assuming non-dfs mount...\n", __func__);
nodfs = true;
}
}