CIFS: Fix mounts if the client is low on credits (6a9cbdd1) · Commits · 戴 / test

If the server doesn't grant us at least 3 credits during the mount we won't be able to complete it because query path info operation requires 3 credits. Use the cached file handle if possible to allow the mount to succeed. Signed-off-by:

Pavel Shilovsky <pshilov@microsoft.com> Reviewed-by:

Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by:

Steve French <stfrench@microsoft.com>

fs/cifs/smb2inode.c

+17 −0

Original line number	Diff line number	Diff line
		@@ -293,6 +293,8 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
		int rc;
		struct smb2_file_all_info *smb2_data;
		__u32 create_options = 0;
		struct cifs_fid fid;
		bool no_cached_open = tcon->nohandlecache;

		*adjust_tz = false;
		*symlink = false;
		@@ -301,6 +303,21 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
		GFP_KERNEL);
		if (smb2_data == NULL)
		return -ENOMEM;

		/* If it is a root and its handle is cached then use it */
		if (!strlen(full_path) && !no_cached_open) {
		rc = open_shroot(xid, tcon, &fid);
		if (rc)
		goto out;
		rc = SMB2_query_info(xid, tcon, fid.persistent_fid,
		fid.volatile_fid, smb2_data);
		close_shroot(&tcon->crfid);
		if (rc)
		goto out;
		move_smb2_info_to_cifs(data, smb2_data);
		goto out;
		}

		if (backup_cred(cifs_sb))
		create_options \|= CREATE_OPEN_BACKUP_INTENT;

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