cifs: cache FILE_ALL_INFO for the shared root handle

[platform/kernel/linux-rpi.git] / fs / cifs / smb2ops.c

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 1654d50..a338190 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -619,6 +619,7 @@ smb2_close_cached_fid(struct kref *ref)
                SMB2_close(0, cfid->tcon, cfid->fid->persistent_fid,
                           cfid->fid->volatile_fid);
                cfid->is_valid = false;
+               cfid->file_all_info_is_valid = false;
        }
 }
 
@@ -643,9 +644,18 @@ smb2_cached_lease_break(struct work_struct *work)
  */
 int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
 {
-       struct cifs_open_parms oparams;
-       int rc;
-       __le16 srch_path = 0; /* Null - since an open of top of share */
+       struct cifs_ses *ses = tcon->ses;
+       struct TCP_Server_Info *server = ses->server;
+       struct cifs_open_parms oparms;
+       struct smb2_create_rsp *o_rsp = NULL;
+       struct smb2_query_info_rsp *qi_rsp = NULL;
+       int resp_buftype[2];
+       struct smb_rqst rqst[2];
+       struct kvec rsp_iov[2];
+       struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
+       struct kvec qi_iov[1];
+       int rc, flags = 0;
+       __le16 utf16_path = 0; /* Null - since an open of top of share */
        u8 oplock = SMB2_OPLOCK_LEVEL_II;
 
        mutex_lock(&tcon->crfid.fid_mutex);
@@ -657,22 +667,89 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
                return 0;
        }
 
-       oparams.tcon = tcon;
-       oparams.create_options = 0;
-       oparams.desired_access = FILE_READ_ATTRIBUTES;
-       oparams.disposition = FILE_OPEN;
-       oparams.fid = pfid;
-       oparams.reconnect = false;
-
-       rc = SMB2_open(xid, &oparams, &srch_path, &oplock, NULL, NULL, NULL);
-       if (rc == 0) {
-               memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid));
-               tcon->crfid.tcon = tcon;
-               tcon->crfid.is_valid = true;
-               kref_init(&tcon->crfid.refcount);
-               kref_get(&tcon->crfid.refcount);
-       }
+       if (smb3_encryption_required(tcon))
+               flags |= CIFS_TRANSFORM_REQ;
+
+       memset(rqst, 0, sizeof(rqst));
+       resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
+       memset(rsp_iov, 0, sizeof(rsp_iov));
+
+       /* Open */
+       memset(&open_iov, 0, sizeof(open_iov));
+       rqst[0].rq_iov = open_iov;
+       rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
+
+       oparms.tcon = tcon;
+       oparms.create_options = 0;
+       oparms.desired_access = FILE_READ_ATTRIBUTES;
+       oparms.disposition = FILE_OPEN;
+       oparms.fid = pfid;
+       oparms.reconnect = false;
+
+       rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, &utf16_path);
+       if (rc)
+               goto oshr_exit;
+       smb2_set_next_command(tcon, &rqst[0]);
+
+       memset(&qi_iov, 0, sizeof(qi_iov));
+       rqst[1].rq_iov = qi_iov;
+       rqst[1].rq_nvec = 1;
+
+       rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID,
+                                 COMPOUND_FID, FILE_ALL_INFORMATION,
+                                 SMB2_O_INFO_FILE, 0,
+                                 sizeof(struct smb2_file_all_info) +
+                                 PATH_MAX * 2, 0, NULL);
+       if (rc)
+               goto oshr_exit;
+
+       smb2_set_related(&rqst[1]);
+
+       rc = compound_send_recv(xid, ses, flags, 2, rqst,
+                               resp_buftype, rsp_iov);
+       if (rc)
+               goto oshr_exit;
+
+       o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
+       oparms.fid->persistent_fid = o_rsp->PersistentFileId;
+       oparms.fid->volatile_fid = o_rsp->VolatileFileId;
+#ifdef CONFIG_CIFS_DEBUG2
+       oparms.fid->mid = le64_to_cpu(o_rsp->sync_hdr.MessageId);
+#endif /* CIFS_DEBUG2 */
+
+       if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
+               oplock = smb2_parse_lease_state(server, o_rsp,
+                                               &oparms.fid->epoch,
+                                               oparms.fid->lease_key);
+       else
+               goto oshr_exit;
+
+
+       memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid));
+       tcon->crfid.tcon = tcon;
+       tcon->crfid.is_valid = true;
+       kref_init(&tcon->crfid.refcount);
+       kref_get(&tcon->crfid.refcount);
+
+
+       qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
+       if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info))
+               goto oshr_exit;
+       rc = smb2_validate_and_copy_iov(
+                               le16_to_cpu(qi_rsp->OutputBufferOffset),
+                               sizeof(struct smb2_file_all_info),
+                               &rsp_iov[1], sizeof(struct smb2_file_all_info),
+                               (char *)&tcon->crfid.file_all_info);
+       if (rc)
+               goto oshr_exit;
+       tcon->crfid.file_all_info_is_valid = 1;
+
+ oshr_exit:
        mutex_unlock(&tcon->crfid.fid_mutex);
+       SMB2_open_free(&rqst[0]);
+       SMB2_query_info_free(&rqst[1]);
+       free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
+       free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
        return rc;
 }